tor-browser

sctp_output.c (415699B)

---

/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
* Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
* Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* a) Redistributions of source code must retain the above copyright notice,
*    this list of conditions and the following disclaimer.
*
* b) Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in
*    the documentation and/or other materials provided with the distribution.
*
* c) Neither the name of Cisco Systems, Inc. nor the names of its
*    contributors may be used to endorse or promote products derived
*    from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/

#include <netinet/sctp_os.h>
#if defined(__FreeBSD__) && !defined(__Userspace__)
#include <sys/proc.h>
#endif
#include <netinet/sctp_var.h>
#include <netinet/sctp_sysctl.h>
#include <netinet/sctp_header.h>
#include <netinet/sctp_pcb.h>
#include <netinet/sctputil.h>
#include <netinet/sctp_output.h>
#include <netinet/sctp_uio.h>
#include <netinet/sctputil.h>
#include <netinet/sctp_auth.h>
#include <netinet/sctp_timer.h>
#include <netinet/sctp_asconf.h>
#include <netinet/sctp_indata.h>
#include <netinet/sctp_bsd_addr.h>
#include <netinet/sctp_input.h>
#include <netinet/sctp_crc32.h>
#if defined(__FreeBSD__) && !defined(__Userspace__)
#include <netinet/sctp_kdtrace.h>
#endif
#if defined(__linux__)
#define __FAVOR_BSD    /* (on Ubuntu at least) enables UDP header field names like BSD in RFC 768 */
#endif
#if defined(INET) || defined(INET6)
#if !defined(_WIN32)
#include <netinet/udp.h>
#endif
#endif
#if !defined(__Userspace__)
#if defined(__APPLE__)
#include <netinet/in.h>
#endif
#if defined(__FreeBSD__) && !defined(__Userspace__)
#include <netinet/udp_var.h>
#include <machine/in_cksum.h>
#endif
#endif
#if defined(__Userspace__) && defined(INET6)
#include <netinet6/sctp6_var.h>
#endif

#if defined(_WIN32) && !defined(_MSC_VER)
#include <minmax.h>
#endif

#if defined(__APPLE__) && !defined(__Userspace__)
#if !(defined(APPLE_LEOPARD) || defined(APPLE_SNOWLEOPARD))
#define SCTP_MAX_LINKHDR 16
#endif
#endif

#define SCTP_MAX_GAPS_INARRAY 4
struct sack_track {
uint8_t right_edge;	/* mergable on the right edge */
uint8_t left_edge;	/* mergable on the left edge */
uint8_t num_entries;
uint8_t spare;
struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
};

const struct sack_track sack_array[256] = {
{0, 0, 0, 0,		/* 0x00 */
	{{0, 0},
	{0, 0},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 1, 0,		/* 0x01 */
	{{0, 0},
	{0, 0},
	{0, 0},
	{0, 0}
	}
},
{0, 0, 1, 0,		/* 0x02 */
	{{1, 1},
	{0, 0},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 1, 0,		/* 0x03 */
	{{0, 1},
	{0, 0},
	{0, 0},
	{0, 0}
	}
},
{0, 0, 1, 0,		/* 0x04 */
	{{2, 2},
	{0, 0},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 2, 0,		/* 0x05 */
	{{0, 0},
	{2, 2},
	{0, 0},
	{0, 0}
	}
},
{0, 0, 1, 0,		/* 0x06 */
	{{1, 2},
	{0, 0},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 1, 0,		/* 0x07 */
	{{0, 2},
	{0, 0},
	{0, 0},
	{0, 0}
	}
},
{0, 0, 1, 0,		/* 0x08 */
	{{3, 3},
	{0, 0},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 2, 0,		/* 0x09 */
	{{0, 0},
	{3, 3},
	{0, 0},
	{0, 0}
	}
},
{0, 0, 2, 0,		/* 0x0a */
	{{1, 1},
	{3, 3},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 2, 0,		/* 0x0b */
	{{0, 1},
	{3, 3},
	{0, 0},
	{0, 0}
	}
},
{0, 0, 1, 0,		/* 0x0c */
	{{2, 3},
	{0, 0},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 2, 0,		/* 0x0d */
	{{0, 0},
	{2, 3},
	{0, 0},
	{0, 0}
	}
},
{0, 0, 1, 0,		/* 0x0e */
	{{1, 3},
	{0, 0},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 1, 0,		/* 0x0f */
	{{0, 3},
	{0, 0},
	{0, 0},
	{0, 0}
	}
},
{0, 0, 1, 0,		/* 0x10 */
	{{4, 4},
	{0, 0},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 2, 0,		/* 0x11 */
	{{0, 0},
	{4, 4},
	{0, 0},
	{0, 0}
	}
},
{0, 0, 2, 0,		/* 0x12 */
	{{1, 1},
	{4, 4},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 2, 0,		/* 0x13 */
	{{0, 1},
	{4, 4},
	{0, 0},
	{0, 0}
	}
},
{0, 0, 2, 0,		/* 0x14 */
	{{2, 2},
	{4, 4},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 3, 0,		/* 0x15 */
	{{0, 0},
	{2, 2},
	{4, 4},
	{0, 0}
	}
},
{0, 0, 2, 0,		/* 0x16 */
	{{1, 2},
	{4, 4},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 2, 0,		/* 0x17 */
	{{0, 2},
	{4, 4},
	{0, 0},
	{0, 0}
	}
},
{0, 0, 1, 0,		/* 0x18 */
	{{3, 4},
	{0, 0},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 2, 0,		/* 0x19 */
	{{0, 0},
	{3, 4},
	{0, 0},
	{0, 0}
	}
},
{0, 0, 2, 0,		/* 0x1a */
	{{1, 1},
	{3, 4},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 2, 0,		/* 0x1b */
	{{0, 1},
	{3, 4},
	{0, 0},
	{0, 0}
	}
},
{0, 0, 1, 0,		/* 0x1c */
	{{2, 4},
	{0, 0},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 2, 0,		/* 0x1d */
	{{0, 0},
	{2, 4},
	{0, 0},
	{0, 0}
	}
},
{0, 0, 1, 0,		/* 0x1e */
	{{1, 4},
	{0, 0},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 1, 0,		/* 0x1f */
	{{0, 4},
	{0, 0},
	{0, 0},
	{0, 0}
	}
},
{0, 0, 1, 0,		/* 0x20 */
	{{5, 5},
	{0, 0},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 2, 0,		/* 0x21 */
	{{0, 0},
	{5, 5},
	{0, 0},
	{0, 0}
	}
},
{0, 0, 2, 0,		/* 0x22 */
	{{1, 1},
	{5, 5},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 2, 0,		/* 0x23 */
	{{0, 1},
	{5, 5},
	{0, 0},
	{0, 0}
	}
},
{0, 0, 2, 0,		/* 0x24 */
	{{2, 2},
	{5, 5},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 3, 0,		/* 0x25 */
	{{0, 0},
	{2, 2},
	{5, 5},
	{0, 0}
	}
},
{0, 0, 2, 0,		/* 0x26 */
	{{1, 2},
	{5, 5},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 2, 0,		/* 0x27 */
	{{0, 2},
	{5, 5},
	{0, 0},
	{0, 0}
	}
},
{0, 0, 2, 0,		/* 0x28 */
	{{3, 3},
	{5, 5},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 3, 0,		/* 0x29 */
	{{0, 0},
	{3, 3},
	{5, 5},
	{0, 0}
	}
},
{0, 0, 3, 0,		/* 0x2a */
	{{1, 1},
	{3, 3},
	{5, 5},
	{0, 0}
	}
},
{1, 0, 3, 0,		/* 0x2b */
	{{0, 1},
	{3, 3},
	{5, 5},
	{0, 0}
	}
},
{0, 0, 2, 0,		/* 0x2c */
	{{2, 3},
	{5, 5},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 3, 0,		/* 0x2d */
	{{0, 0},
	{2, 3},
	{5, 5},
	{0, 0}
	}
},
{0, 0, 2, 0,		/* 0x2e */
	{{1, 3},
	{5, 5},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 2, 0,		/* 0x2f */
	{{0, 3},
	{5, 5},
	{0, 0},
	{0, 0}
	}
},
{0, 0, 1, 0,		/* 0x30 */
	{{4, 5},
	{0, 0},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 2, 0,		/* 0x31 */
	{{0, 0},
	{4, 5},
	{0, 0},
	{0, 0}
	}
},
{0, 0, 2, 0,		/* 0x32 */
	{{1, 1},
	{4, 5},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 2, 0,		/* 0x33 */
	{{0, 1},
	{4, 5},
	{0, 0},
	{0, 0}
	}
},
{0, 0, 2, 0,		/* 0x34 */
	{{2, 2},
	{4, 5},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 3, 0,		/* 0x35 */
	{{0, 0},
	{2, 2},
	{4, 5},
	{0, 0}
	}
},
{0, 0, 2, 0,		/* 0x36 */
	{{1, 2},
	{4, 5},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 2, 0,		/* 0x37 */
	{{0, 2},
	{4, 5},
	{0, 0},
	{0, 0}
	}
},
{0, 0, 1, 0,		/* 0x38 */
	{{3, 5},
	{0, 0},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 2, 0,		/* 0x39 */
	{{0, 0},
	{3, 5},
	{0, 0},
	{0, 0}
	}
},
{0, 0, 2, 0,		/* 0x3a */
	{{1, 1},
	{3, 5},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 2, 0,		/* 0x3b */
	{{0, 1},
	{3, 5},
	{0, 0},
	{0, 0}
	}
},
{0, 0, 1, 0,		/* 0x3c */
	{{2, 5},
	{0, 0},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 2, 0,		/* 0x3d */
	{{0, 0},
	{2, 5},
	{0, 0},
	{0, 0}
	}
},
{0, 0, 1, 0,		/* 0x3e */
	{{1, 5},
	{0, 0},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 1, 0,		/* 0x3f */
	{{0, 5},
	{0, 0},
	{0, 0},
	{0, 0}
	}
},
{0, 0, 1, 0,		/* 0x40 */
	{{6, 6},
	{0, 0},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 2, 0,		/* 0x41 */
	{{0, 0},
	{6, 6},
	{0, 0},
	{0, 0}
	}
},
{0, 0, 2, 0,		/* 0x42 */
	{{1, 1},
	{6, 6},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 2, 0,		/* 0x43 */
	{{0, 1},
	{6, 6},
	{0, 0},
	{0, 0}
	}
},
{0, 0, 2, 0,		/* 0x44 */
	{{2, 2},
	{6, 6},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 3, 0,		/* 0x45 */
	{{0, 0},
	{2, 2},
	{6, 6},
	{0, 0}
	}
},
{0, 0, 2, 0,		/* 0x46 */
	{{1, 2},
	{6, 6},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 2, 0,		/* 0x47 */
	{{0, 2},
	{6, 6},
	{0, 0},
	{0, 0}
	}
},
{0, 0, 2, 0,		/* 0x48 */
	{{3, 3},
	{6, 6},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 3, 0,		/* 0x49 */
	{{0, 0},
	{3, 3},
	{6, 6},
	{0, 0}
	}
},
{0, 0, 3, 0,		/* 0x4a */
	{{1, 1},
	{3, 3},
	{6, 6},
	{0, 0}
	}
},
{1, 0, 3, 0,		/* 0x4b */
	{{0, 1},
	{3, 3},
	{6, 6},
	{0, 0}
	}
},
{0, 0, 2, 0,		/* 0x4c */
	{{2, 3},
	{6, 6},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 3, 0,		/* 0x4d */
	{{0, 0},
	{2, 3},
	{6, 6},
	{0, 0}
	}
},
{0, 0, 2, 0,		/* 0x4e */
	{{1, 3},
	{6, 6},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 2, 0,		/* 0x4f */
	{{0, 3},
	{6, 6},
	{0, 0},
	{0, 0}
	}
},
{0, 0, 2, 0,		/* 0x50 */
	{{4, 4},
	{6, 6},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 3, 0,		/* 0x51 */
	{{0, 0},
	{4, 4},
	{6, 6},
	{0, 0}
	}
},
{0, 0, 3, 0,		/* 0x52 */
	{{1, 1},
	{4, 4},
	{6, 6},
	{0, 0}
	}
},
{1, 0, 3, 0,		/* 0x53 */
	{{0, 1},
	{4, 4},
	{6, 6},
	{0, 0}
	}
},
{0, 0, 3, 0,		/* 0x54 */
	{{2, 2},
	{4, 4},
	{6, 6},
	{0, 0}
	}
},
{1, 0, 4, 0,		/* 0x55 */
	{{0, 0},
	{2, 2},
	{4, 4},
	{6, 6}
	}
},
{0, 0, 3, 0,		/* 0x56 */
	{{1, 2},
	{4, 4},
	{6, 6},
	{0, 0}
	}
},
{1, 0, 3, 0,		/* 0x57 */
	{{0, 2},
	{4, 4},
	{6, 6},
	{0, 0}
	}
},
{0, 0, 2, 0,		/* 0x58 */
	{{3, 4},
	{6, 6},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 3, 0,		/* 0x59 */
	{{0, 0},
	{3, 4},
	{6, 6},
	{0, 0}
	}
},
{0, 0, 3, 0,		/* 0x5a */
	{{1, 1},
	{3, 4},
	{6, 6},
	{0, 0}
	}
},
{1, 0, 3, 0,		/* 0x5b */
	{{0, 1},
	{3, 4},
	{6, 6},
	{0, 0}
	}
},
{0, 0, 2, 0,		/* 0x5c */
	{{2, 4},
	{6, 6},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 3, 0,		/* 0x5d */
	{{0, 0},
	{2, 4},
	{6, 6},
	{0, 0}
	}
},
{0, 0, 2, 0,		/* 0x5e */
	{{1, 4},
	{6, 6},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 2, 0,		/* 0x5f */
	{{0, 4},
	{6, 6},
	{0, 0},
	{0, 0}
	}
},
{0, 0, 1, 0,		/* 0x60 */
	{{5, 6},
	{0, 0},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 2, 0,		/* 0x61 */
	{{0, 0},
	{5, 6},
	{0, 0},
	{0, 0}
	}
},
{0, 0, 2, 0,		/* 0x62 */
	{{1, 1},
	{5, 6},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 2, 0,		/* 0x63 */
	{{0, 1},
	{5, 6},
	{0, 0},
	{0, 0}
	}
},
{0, 0, 2, 0,		/* 0x64 */
	{{2, 2},
	{5, 6},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 3, 0,		/* 0x65 */
	{{0, 0},
	{2, 2},
	{5, 6},
	{0, 0}
	}
},
{0, 0, 2, 0,		/* 0x66 */
	{{1, 2},
	{5, 6},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 2, 0,		/* 0x67 */
	{{0, 2},
	{5, 6},
	{0, 0},
	{0, 0}
	}
},
{0, 0, 2, 0,		/* 0x68 */
	{{3, 3},
	{5, 6},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 3, 0,		/* 0x69 */
	{{0, 0},
	{3, 3},
	{5, 6},
	{0, 0}
	}
},
{0, 0, 3, 0,		/* 0x6a */
	{{1, 1},
	{3, 3},
	{5, 6},
	{0, 0}
	}
},
{1, 0, 3, 0,		/* 0x6b */
	{{0, 1},
	{3, 3},
	{5, 6},
	{0, 0}
	}
},
{0, 0, 2, 0,		/* 0x6c */
	{{2, 3},
	{5, 6},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 3, 0,		/* 0x6d */
	{{0, 0},
	{2, 3},
	{5, 6},
	{0, 0}
	}
},
{0, 0, 2, 0,		/* 0x6e */
	{{1, 3},
	{5, 6},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 2, 0,		/* 0x6f */
	{{0, 3},
	{5, 6},
	{0, 0},
	{0, 0}
	}
},
{0, 0, 1, 0,		/* 0x70 */
	{{4, 6},
	{0, 0},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 2, 0,		/* 0x71 */
	{{0, 0},
	{4, 6},
	{0, 0},
	{0, 0}
	}
},
{0, 0, 2, 0,		/* 0x72 */
	{{1, 1},
	{4, 6},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 2, 0,		/* 0x73 */
	{{0, 1},
	{4, 6},
	{0, 0},
	{0, 0}
	}
},
{0, 0, 2, 0,		/* 0x74 */
	{{2, 2},
	{4, 6},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 3, 0,		/* 0x75 */
	{{0, 0},
	{2, 2},
	{4, 6},
	{0, 0}
	}
},
{0, 0, 2, 0,		/* 0x76 */
	{{1, 2},
	{4, 6},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 2, 0,		/* 0x77 */
	{{0, 2},
	{4, 6},
	{0, 0},
	{0, 0}
	}
},
{0, 0, 1, 0,		/* 0x78 */
	{{3, 6},
	{0, 0},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 2, 0,		/* 0x79 */
	{{0, 0},
	{3, 6},
	{0, 0},
	{0, 0}
	}
},
{0, 0, 2, 0,		/* 0x7a */
	{{1, 1},
	{3, 6},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 2, 0,		/* 0x7b */
	{{0, 1},
	{3, 6},
	{0, 0},
	{0, 0}
	}
},
{0, 0, 1, 0,		/* 0x7c */
	{{2, 6},
	{0, 0},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 2, 0,		/* 0x7d */
	{{0, 0},
	{2, 6},
	{0, 0},
	{0, 0}
	}
},
{0, 0, 1, 0,		/* 0x7e */
	{{1, 6},
	{0, 0},
	{0, 0},
	{0, 0}
	}
},
{1, 0, 1, 0,		/* 0x7f */
	{{0, 6},
	{0, 0},
	{0, 0},
	{0, 0}
	}
},
{0, 1, 1, 0,		/* 0x80 */
	{{7, 7},
	{0, 0},
	{0, 0},
	{0, 0}
	}
},
{1, 1, 2, 0,		/* 0x81 */
	{{0, 0},
	{7, 7},
	{0, 0},
	{0, 0}
	}
},
{0, 1, 2, 0,		/* 0x82 */
	{{1, 1},
	{7, 7},
	{0, 0},
	{0, 0}
	}
},
{1, 1, 2, 0,		/* 0x83 */
	{{0, 1},
	{7, 7},
	{0, 0},
	{0, 0}
	}
},
{0, 1, 2, 0,		/* 0x84 */
	{{2, 2},
	{7, 7},
	{0, 0},
	{0, 0}
	}
},
{1, 1, 3, 0,		/* 0x85 */
	{{0, 0},
	{2, 2},
	{7, 7},
	{0, 0}
	}
},
{0, 1, 2, 0,		/* 0x86 */
	{{1, 2},
	{7, 7},
	{0, 0},
	{0, 0}
	}
},
{1, 1, 2, 0,		/* 0x87 */
	{{0, 2},
	{7, 7},
	{0, 0},
	{0, 0}
	}
},
{0, 1, 2, 0,		/* 0x88 */
	{{3, 3},
	{7, 7},
	{0, 0},
	{0, 0}
	}
},
{1, 1, 3, 0,		/* 0x89 */
	{{0, 0},
	{3, 3},
	{7, 7},
	{0, 0}
	}
},
{0, 1, 3, 0,		/* 0x8a */
	{{1, 1},
	{3, 3},
	{7, 7},
	{0, 0}
	}
},
{1, 1, 3, 0,		/* 0x8b */
	{{0, 1},
	{3, 3},
	{7, 7},
	{0, 0}
	}
},
{0, 1, 2, 0,		/* 0x8c */
	{{2, 3},
	{7, 7},
	{0, 0},
	{0, 0}
	}
},
{1, 1, 3, 0,		/* 0x8d */
	{{0, 0},
	{2, 3},
	{7, 7},
	{0, 0}
	}
},
{0, 1, 2, 0,		/* 0x8e */
	{{1, 3},
	{7, 7},
	{0, 0},
	{0, 0}
	}
},
{1, 1, 2, 0,		/* 0x8f */
	{{0, 3},
	{7, 7},
	{0, 0},
	{0, 0}
	}
},
{0, 1, 2, 0,		/* 0x90 */
	{{4, 4},
	{7, 7},
	{0, 0},
	{0, 0}
	}
},
{1, 1, 3, 0,		/* 0x91 */
	{{0, 0},
	{4, 4},
	{7, 7},
	{0, 0}
	}
},
{0, 1, 3, 0,		/* 0x92 */
	{{1, 1},
	{4, 4},
	{7, 7},
	{0, 0}
	}
},
{1, 1, 3, 0,		/* 0x93 */
	{{0, 1},
	{4, 4},
	{7, 7},
	{0, 0}
	}
},
{0, 1, 3, 0,		/* 0x94 */
	{{2, 2},
	{4, 4},
	{7, 7},
	{0, 0}
	}
},
{1, 1, 4, 0,		/* 0x95 */
	{{0, 0},
	{2, 2},
	{4, 4},
	{7, 7}
	}
},
{0, 1, 3, 0,		/* 0x96 */
	{{1, 2},
	{4, 4},
	{7, 7},
	{0, 0}
	}
},
{1, 1, 3, 0,		/* 0x97 */
	{{0, 2},
	{4, 4},
	{7, 7},
	{0, 0}
	}
},
{0, 1, 2, 0,		/* 0x98 */
	{{3, 4},
	{7, 7},
	{0, 0},
	{0, 0}
	}
},
{1, 1, 3, 0,		/* 0x99 */
	{{0, 0},
	{3, 4},
	{7, 7},
	{0, 0}
	}
},
{0, 1, 3, 0,		/* 0x9a */
	{{1, 1},
	{3, 4},
	{7, 7},
	{0, 0}
	}
},
{1, 1, 3, 0,		/* 0x9b */
	{{0, 1},
	{3, 4},
	{7, 7},
	{0, 0}
	}
},
{0, 1, 2, 0,		/* 0x9c */
	{{2, 4},
	{7, 7},
	{0, 0},
	{0, 0}
	}
},
{1, 1, 3, 0,		/* 0x9d */
	{{0, 0},
	{2, 4},
	{7, 7},
	{0, 0}
	}
},
{0, 1, 2, 0,		/* 0x9e */
	{{1, 4},
	{7, 7},
	{0, 0},
	{0, 0}
	}
},
{1, 1, 2, 0,		/* 0x9f */
	{{0, 4},
	{7, 7},
	{0, 0},
	{0, 0}
	}
},
{0, 1, 2, 0,		/* 0xa0 */
	{{5, 5},
	{7, 7},
	{0, 0},
	{0, 0}
	}
},
{1, 1, 3, 0,		/* 0xa1 */
	{{0, 0},
	{5, 5},
	{7, 7},
	{0, 0}
	}
},
{0, 1, 3, 0,		/* 0xa2 */
	{{1, 1},
	{5, 5},
	{7, 7},
	{0, 0}
	}
},
{1, 1, 3, 0,		/* 0xa3 */
	{{0, 1},
	{5, 5},
	{7, 7},
	{0, 0}
	}
},
{0, 1, 3, 0,		/* 0xa4 */
	{{2, 2},
	{5, 5},
	{7, 7},
	{0, 0}
	}
},
{1, 1, 4, 0,		/* 0xa5 */
	{{0, 0},
	{2, 2},
	{5, 5},
	{7, 7}
	}
},
{0, 1, 3, 0,		/* 0xa6 */
	{{1, 2},
	{5, 5},
	{7, 7},
	{0, 0}
	}
},
{1, 1, 3, 0,		/* 0xa7 */
	{{0, 2},
	{5, 5},
	{7, 7},
	{0, 0}
	}
},
{0, 1, 3, 0,		/* 0xa8 */
	{{3, 3},
	{5, 5},
	{7, 7},
	{0, 0}
	}
},
{1, 1, 4, 0,		/* 0xa9 */
	{{0, 0},
	{3, 3},
	{5, 5},
	{7, 7}
	}
},
{0, 1, 4, 0,		/* 0xaa */
	{{1, 1},
	{3, 3},
	{5, 5},
	{7, 7}
	}
},
{1, 1, 4, 0,		/* 0xab */
	{{0, 1},
	{3, 3},
	{5, 5},
	{7, 7}
	}
},
{0, 1, 3, 0,		/* 0xac */
	{{2, 3},
	{5, 5},
	{7, 7},
	{0, 0}
	}
},
{1, 1, 4, 0,		/* 0xad */
	{{0, 0},
	{2, 3},
	{5, 5},
	{7, 7}
	}
},
{0, 1, 3, 0,		/* 0xae */
	{{1, 3},
	{5, 5},
	{7, 7},
	{0, 0}
	}
},
{1, 1, 3, 0,		/* 0xaf */
	{{0, 3},
	{5, 5},
	{7, 7},
	{0, 0}
	}
},
{0, 1, 2, 0,		/* 0xb0 */
	{{4, 5},
	{7, 7},
	{0, 0},
	{0, 0}
	}
},
{1, 1, 3, 0,		/* 0xb1 */
	{{0, 0},
	{4, 5},
	{7, 7},
	{0, 0}
	}
},
{0, 1, 3, 0,		/* 0xb2 */
	{{1, 1},
	{4, 5},
	{7, 7},
	{0, 0}
	}
},
{1, 1, 3, 0,		/* 0xb3 */
	{{0, 1},
	{4, 5},
	{7, 7},
	{0, 0}
	}
},
{0, 1, 3, 0,		/* 0xb4 */
	{{2, 2},
	{4, 5},
	{7, 7},
	{0, 0}
	}
},
{1, 1, 4, 0,		/* 0xb5 */
	{{0, 0},
	{2, 2},
	{4, 5},
	{7, 7}
	}
},
{0, 1, 3, 0,		/* 0xb6 */
	{{1, 2},
	{4, 5},
	{7, 7},
	{0, 0}
	}
},
{1, 1, 3, 0,		/* 0xb7 */
	{{0, 2},
	{4, 5},
	{7, 7},
	{0, 0}
	}
},
{0, 1, 2, 0,		/* 0xb8 */
	{{3, 5},
	{7, 7},
	{0, 0},
	{0, 0}
	}
},
{1, 1, 3, 0,		/* 0xb9 */
	{{0, 0},
	{3, 5},
	{7, 7},
	{0, 0}
	}
},
{0, 1, 3, 0,		/* 0xba */
	{{1, 1},
	{3, 5},
	{7, 7},
	{0, 0}
	}
},
{1, 1, 3, 0,		/* 0xbb */
	{{0, 1},
	{3, 5},
	{7, 7},
	{0, 0}
	}
},
{0, 1, 2, 0,		/* 0xbc */
	{{2, 5},
	{7, 7},
	{0, 0},
	{0, 0}
	}
},
{1, 1, 3, 0,		/* 0xbd */
	{{0, 0},
	{2, 5},
	{7, 7},
	{0, 0}
	}
},
{0, 1, 2, 0,		/* 0xbe */
	{{1, 5},
	{7, 7},
	{0, 0},
	{0, 0}
	}
},
{1, 1, 2, 0,		/* 0xbf */
	{{0, 5},
	{7, 7},
	{0, 0},
	{0, 0}
	}
},
{0, 1, 1, 0,		/* 0xc0 */
	{{6, 7},
	{0, 0},
	{0, 0},
	{0, 0}
	}
},
{1, 1, 2, 0,		/* 0xc1 */
	{{0, 0},
	{6, 7},
	{0, 0},
	{0, 0}
	}
},
{0, 1, 2, 0,		/* 0xc2 */
	{{1, 1},
	{6, 7},
	{0, 0},
	{0, 0}
	}
},
{1, 1, 2, 0,		/* 0xc3 */
	{{0, 1},
	{6, 7},
	{0, 0},
	{0, 0}
	}
},
{0, 1, 2, 0,		/* 0xc4 */
	{{2, 2},
	{6, 7},
	{0, 0},
	{0, 0}
	}
},
{1, 1, 3, 0,		/* 0xc5 */
	{{0, 0},
	{2, 2},
	{6, 7},
	{0, 0}
	}
},
{0, 1, 2, 0,		/* 0xc6 */
	{{1, 2},
	{6, 7},
	{0, 0},
	{0, 0}
	}
},
{1, 1, 2, 0,		/* 0xc7 */
	{{0, 2},
	{6, 7},
	{0, 0},
	{0, 0}
	}
},
{0, 1, 2, 0,		/* 0xc8 */
	{{3, 3},
	{6, 7},
	{0, 0},
	{0, 0}
	}
},
{1, 1, 3, 0,		/* 0xc9 */
	{{0, 0},
	{3, 3},
	{6, 7},
	{0, 0}
	}
},
{0, 1, 3, 0,		/* 0xca */
	{{1, 1},
	{3, 3},
	{6, 7},
	{0, 0}
	}
},
{1, 1, 3, 0,		/* 0xcb */
	{{0, 1},
	{3, 3},
	{6, 7},
	{0, 0}
	}
},
{0, 1, 2, 0,		/* 0xcc */
	{{2, 3},
	{6, 7},
	{0, 0},
	{0, 0}
	}
},
{1, 1, 3, 0,		/* 0xcd */
	{{0, 0},
	{2, 3},
	{6, 7},
	{0, 0}
	}
},
{0, 1, 2, 0,		/* 0xce */
	{{1, 3},
	{6, 7},
	{0, 0},
	{0, 0}
	}
},
{1, 1, 2, 0,		/* 0xcf */
	{{0, 3},
	{6, 7},
	{0, 0},
	{0, 0}
	}
},
{0, 1, 2, 0,		/* 0xd0 */
	{{4, 4},
	{6, 7},
	{0, 0},
	{0, 0}
	}
},
{1, 1, 3, 0,		/* 0xd1 */
	{{0, 0},
	{4, 4},
	{6, 7},
	{0, 0}
	}
},
{0, 1, 3, 0,		/* 0xd2 */
	{{1, 1},
	{4, 4},
	{6, 7},
	{0, 0}
	}
},
{1, 1, 3, 0,		/* 0xd3 */
	{{0, 1},
	{4, 4},
	{6, 7},
	{0, 0}
	}
},
{0, 1, 3, 0,		/* 0xd4 */
	{{2, 2},
	{4, 4},
	{6, 7},
	{0, 0}
	}
},
{1, 1, 4, 0,		/* 0xd5 */
	{{0, 0},
	{2, 2},
	{4, 4},
	{6, 7}
	}
},
{0, 1, 3, 0,		/* 0xd6 */
	{{1, 2},
	{4, 4},
	{6, 7},
	{0, 0}
	}
},
{1, 1, 3, 0,		/* 0xd7 */
	{{0, 2},
	{4, 4},
	{6, 7},
	{0, 0}
	}
},
{0, 1, 2, 0,		/* 0xd8 */
	{{3, 4},
	{6, 7},
	{0, 0},
	{0, 0}
	}
},
{1, 1, 3, 0,		/* 0xd9 */
	{{0, 0},
	{3, 4},
	{6, 7},
	{0, 0}
	}
},
{0, 1, 3, 0,		/* 0xda */
	{{1, 1},
	{3, 4},
	{6, 7},
	{0, 0}
	}
},
{1, 1, 3, 0,		/* 0xdb */
	{{0, 1},
	{3, 4},
	{6, 7},
	{0, 0}
	}
},
{0, 1, 2, 0,		/* 0xdc */
	{{2, 4},
	{6, 7},
	{0, 0},
	{0, 0}
	}
},
{1, 1, 3, 0,		/* 0xdd */
	{{0, 0},
	{2, 4},
	{6, 7},
	{0, 0}
	}
},
{0, 1, 2, 0,		/* 0xde */
	{{1, 4},
	{6, 7},
	{0, 0},
	{0, 0}
	}
},
{1, 1, 2, 0,		/* 0xdf */
	{{0, 4},
	{6, 7},
	{0, 0},
	{0, 0}
	}
},
{0, 1, 1, 0,		/* 0xe0 */
	{{5, 7},
	{0, 0},
	{0, 0},
	{0, 0}
	}
},
{1, 1, 2, 0,		/* 0xe1 */
	{{0, 0},
	{5, 7},
	{0, 0},
	{0, 0}
	}
},
{0, 1, 2, 0,		/* 0xe2 */
	{{1, 1},
	{5, 7},
	{0, 0},
	{0, 0}
	}
},
{1, 1, 2, 0,		/* 0xe3 */
	{{0, 1},
	{5, 7},
	{0, 0},
	{0, 0}
	}
},
{0, 1, 2, 0,		/* 0xe4 */
	{{2, 2},
	{5, 7},
	{0, 0},
	{0, 0}
	}
},
{1, 1, 3, 0,		/* 0xe5 */
	{{0, 0},
	{2, 2},
	{5, 7},
	{0, 0}
	}
},
{0, 1, 2, 0,		/* 0xe6 */
	{{1, 2},
	{5, 7},
	{0, 0},
	{0, 0}
	}
},
{1, 1, 2, 0,		/* 0xe7 */
	{{0, 2},
	{5, 7},
	{0, 0},
	{0, 0}
	}
},
{0, 1, 2, 0,		/* 0xe8 */
	{{3, 3},
	{5, 7},
	{0, 0},
	{0, 0}
	}
},
{1, 1, 3, 0,		/* 0xe9 */
	{{0, 0},
	{3, 3},
	{5, 7},
	{0, 0}
	}
},
{0, 1, 3, 0,		/* 0xea */
	{{1, 1},
	{3, 3},
	{5, 7},
	{0, 0}
	}
},
{1, 1, 3, 0,		/* 0xeb */
	{{0, 1},
	{3, 3},
	{5, 7},
	{0, 0}
	}
},
{0, 1, 2, 0,		/* 0xec */
	{{2, 3},
	{5, 7},
	{0, 0},
	{0, 0}
	}
},
{1, 1, 3, 0,		/* 0xed */
	{{0, 0},
	{2, 3},
	{5, 7},
	{0, 0}
	}
},
{0, 1, 2, 0,		/* 0xee */
	{{1, 3},
	{5, 7},
	{0, 0},
	{0, 0}
	}
},
{1, 1, 2, 0,		/* 0xef */
	{{0, 3},
	{5, 7},
	{0, 0},
	{0, 0}
	}
},
{0, 1, 1, 0,		/* 0xf0 */
	{{4, 7},
	{0, 0},
	{0, 0},
	{0, 0}
	}
},
{1, 1, 2, 0,		/* 0xf1 */
	{{0, 0},
	{4, 7},
	{0, 0},
	{0, 0}
	}
},
{0, 1, 2, 0,		/* 0xf2 */
	{{1, 1},
	{4, 7},
	{0, 0},
	{0, 0}
	}
},
{1, 1, 2, 0,		/* 0xf3 */
	{{0, 1},
	{4, 7},
	{0, 0},
	{0, 0}
	}
},
{0, 1, 2, 0,		/* 0xf4 */
	{{2, 2},
	{4, 7},
	{0, 0},
	{0, 0}
	}
},
{1, 1, 3, 0,		/* 0xf5 */
	{{0, 0},
	{2, 2},
	{4, 7},
	{0, 0}
	}
},
{0, 1, 2, 0,		/* 0xf6 */
	{{1, 2},
	{4, 7},
	{0, 0},
	{0, 0}
	}
},
{1, 1, 2, 0,		/* 0xf7 */
	{{0, 2},
	{4, 7},
	{0, 0},
	{0, 0}
	}
},
{0, 1, 1, 0,		/* 0xf8 */
	{{3, 7},
	{0, 0},
	{0, 0},
	{0, 0}
	}
},
{1, 1, 2, 0,		/* 0xf9 */
	{{0, 0},
	{3, 7},
	{0, 0},
	{0, 0}
	}
},
{0, 1, 2, 0,		/* 0xfa */
	{{1, 1},
	{3, 7},
	{0, 0},
	{0, 0}
	}
},
{1, 1, 2, 0,		/* 0xfb */
	{{0, 1},
	{3, 7},
	{0, 0},
	{0, 0}
	}
},
{0, 1, 1, 0,		/* 0xfc */
	{{2, 7},
	{0, 0},
	{0, 0},
	{0, 0}
	}
},
{1, 1, 2, 0,		/* 0xfd */
	{{0, 0},
	{2, 7},
	{0, 0},
	{0, 0}
	}
},
{0, 1, 1, 0,		/* 0xfe */
	{{1, 7},
	{0, 0},
	{0, 0},
	{0, 0}
	}
},
{1, 1, 1, 0,		/* 0xff */
	{{0, 7},
	{0, 0},
	{0, 0},
	{0, 0}
	}
}
};

int
sctp_is_address_in_scope(struct sctp_ifa *ifa,
                        struct sctp_scoping *scope,
                        int do_update)
{
if ((scope->loopback_scope == 0) &&
    (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
	/*
	 * skip loopback if not in scope *
	 */
	return (0);
}
switch (ifa->address.sa.sa_family) {
#ifdef INET
case AF_INET:
	if (scope->ipv4_addr_legal) {
		struct sockaddr_in *sin;

		sin = &ifa->address.sin;
		if (sin->sin_addr.s_addr == 0) {
			/* not in scope , unspecified */
			return (0);
		}
		if ((scope->ipv4_local_scope == 0) &&
		    (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
			/* private address not in scope */
			return (0);
		}
	} else {
		return (0);
	}
	break;
#endif
#ifdef INET6
case AF_INET6:
	if (scope->ipv6_addr_legal) {
		struct sockaddr_in6 *sin6;

		/* Must update the flags,  bummer, which
		 * means any IFA locks must now be applied HERE <->
		 */
		if (do_update) {
			sctp_gather_internal_ifa_flags(ifa);
		}
		if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
			return (0);
		}
		/* ok to use deprecated addresses? */
		sin6 = &ifa->address.sin6;
		if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
			/* skip unspecified addresses */
			return (0);
		}
		if (		/* (local_scope == 0) && */
		    (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
			return (0);
		}
		if ((scope->site_scope == 0) &&
		    (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
			return (0);
		}
	} else {
		return (0);
	}
	break;
#endif
#if defined(__Userspace__)
case AF_CONN:
	if (!scope->conn_addr_legal) {
		return (0);
	}
	break;
#endif
default:
	return (0);
}
return (1);
}

static struct mbuf *
sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa, uint16_t *len)
{
#if defined(INET) || defined(INET6)
struct sctp_paramhdr *paramh;
struct mbuf *mret;
uint16_t plen;
#endif

switch (ifa->address.sa.sa_family) {
#ifdef INET
case AF_INET:
	plen = (uint16_t)sizeof(struct sctp_ipv4addr_param);
	break;
#endif
#ifdef INET6
case AF_INET6:
	plen = (uint16_t)sizeof(struct sctp_ipv6addr_param);
	break;
#endif
default:
	return (m);
}
#if defined(INET) || defined(INET6)
if (M_TRAILINGSPACE(m) >= plen) {
	/* easy side we just drop it on the end */
	paramh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
	mret = m;
} else {
	/* Need more space */
	mret = m;
	while (SCTP_BUF_NEXT(mret) != NULL) {
		mret = SCTP_BUF_NEXT(mret);
	}
	SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(plen, 0, M_NOWAIT, 1, MT_DATA);
	if (SCTP_BUF_NEXT(mret) == NULL) {
		/* We are hosed, can't add more addresses */
		return (m);
	}
	mret = SCTP_BUF_NEXT(mret);
	paramh = mtod(mret, struct sctp_paramhdr *);
}
/* now add the parameter */
switch (ifa->address.sa.sa_family) {
#ifdef INET
case AF_INET:
{
	struct sctp_ipv4addr_param *ipv4p;
	struct sockaddr_in *sin;

	sin = &ifa->address.sin;
	ipv4p = (struct sctp_ipv4addr_param *)paramh;
	paramh->param_type = htons(SCTP_IPV4_ADDRESS);
	paramh->param_length = htons(plen);
	ipv4p->addr = sin->sin_addr.s_addr;
	SCTP_BUF_LEN(mret) += plen;
	break;
}
#endif
#ifdef INET6
case AF_INET6:
{
	struct sctp_ipv6addr_param *ipv6p;
	struct sockaddr_in6 *sin6;

	sin6 = &ifa->address.sin6;
	ipv6p = (struct sctp_ipv6addr_param *)paramh;
	paramh->param_type = htons(SCTP_IPV6_ADDRESS);
	paramh->param_length = htons(plen);
	memcpy(ipv6p->addr, &sin6->sin6_addr,
	    sizeof(ipv6p->addr));
#if defined(SCTP_EMBEDDED_V6_SCOPE)
	/* clear embedded scope in the address */
	in6_clearscope((struct in6_addr *)ipv6p->addr);
#endif
	SCTP_BUF_LEN(mret) += plen;
	break;
}
#endif
default:
	return (m);
}
if (len != NULL) {
	*len += plen;
}
return (mret);
#endif
}

struct mbuf *
sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
                          struct sctp_scoping *scope,
		   struct mbuf *m_at, int cnt_inits_to,
		   uint16_t *padding_len, uint16_t *chunk_len)
{
struct sctp_vrf *vrf = NULL;
int cnt, limit_out = 0, total_count;
uint32_t vrf_id;

vrf_id = inp->def_vrf_id;
SCTP_IPI_ADDR_RLOCK();
vrf = sctp_find_vrf(vrf_id);
if (vrf == NULL) {
	SCTP_IPI_ADDR_RUNLOCK();
	return (m_at);
}
if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
	struct sctp_ifa *sctp_ifap;
	struct sctp_ifn *sctp_ifnp;

	cnt = cnt_inits_to;
	if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
		limit_out = 1;
		cnt = SCTP_ADDRESS_LIMIT;
		goto skip_count;
	}
	LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
		if ((scope->loopback_scope == 0) &&
		    SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
			/*
			 * Skip loopback devices if loopback_scope
			 * not set
			 */
			continue;
		}
		LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
#if defined(__FreeBSD__) && !defined(__Userspace__)
#ifdef INET
			if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
			    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
			                      &sctp_ifap->address.sin.sin_addr) != 0)) {
				continue;
			}
#endif
#ifdef INET6
			if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
			    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
			                      &sctp_ifap->address.sin6.sin6_addr) != 0)) {
				continue;
			}
#endif
#endif
			if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
				continue;
			}
#if defined(__Userspace__)
			if (sctp_ifap->address.sa.sa_family == AF_CONN) {
				continue;
			}
#endif
			if (sctp_is_address_in_scope(sctp_ifap, scope, 1) == 0) {
				continue;
			}
			cnt++;
			if (cnt > SCTP_ADDRESS_LIMIT) {
				break;
			}
		}
		if (cnt > SCTP_ADDRESS_LIMIT) {
			break;
		}
	}
skip_count:
	if (cnt > 1) {
		total_count = 0;
		LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
			cnt = 0;
			if ((scope->loopback_scope == 0) &&
			    SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
				/*
				 * Skip loopback devices if
				 * loopback_scope not set
				 */
				continue;
			}
			LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
#if defined(__FreeBSD__) && !defined(__Userspace__)
#ifdef INET
				if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
				    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
				                      &sctp_ifap->address.sin.sin_addr) != 0)) {
					continue;
				}
#endif
#ifdef INET6
				if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
				    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
				                      &sctp_ifap->address.sin6.sin6_addr) != 0)) {
					continue;
				}
#endif
#endif
				if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
					continue;
				}
#if defined(__Userspace__)
				if (sctp_ifap->address.sa.sa_family == AF_CONN) {
					continue;
				}
#endif
				if (sctp_is_address_in_scope(sctp_ifap,
							     scope, 0) == 0) {
					continue;
				}
				if ((chunk_len != NULL) &&
				    (padding_len != NULL) &&
				    (*padding_len > 0)) {
					memset(mtod(m_at, caddr_t) + *chunk_len, 0, *padding_len);
					SCTP_BUF_LEN(m_at) += *padding_len;
					*chunk_len += *padding_len;
					*padding_len = 0;
				}
				m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap, chunk_len);
				if (limit_out) {
					cnt++;
					total_count++;
					if (cnt >= 2) {
						/* two from each address */
						break;
					}
					if (total_count > SCTP_ADDRESS_LIMIT) {
						/* No more addresses */
						break;
					}
				}
			}
		}
	}
} else {
	struct sctp_laddr *laddr;

	cnt = cnt_inits_to;
	/* First, how many ? */
	LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
		if (laddr->ifa == NULL) {
			continue;
		}
		if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
			/* Address being deleted by the system, dont
			 * list.
			 */
			continue;
		if (laddr->action == SCTP_DEL_IP_ADDRESS) {
			/* Address being deleted on this ep
			 * don't list.
			 */
			continue;
		}
#if defined(__Userspace__)
		if (laddr->ifa->address.sa.sa_family == AF_CONN) {
			continue;
		}
#endif
		if (sctp_is_address_in_scope(laddr->ifa,
					     scope, 1) == 0) {
			continue;
		}
		cnt++;
	}
	/*
	 * To get through a NAT we only list addresses if we have
	 * more than one. That way if you just bind a single address
	 * we let the source of the init dictate our address.
	 */
	if (cnt > 1) {
		cnt = cnt_inits_to;
		LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
			if (laddr->ifa == NULL) {
				continue;
			}
			if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
				continue;
			}
#if defined(__Userspace__)
			if (laddr->ifa->address.sa.sa_family == AF_CONN) {
				continue;
			}
#endif
			if (sctp_is_address_in_scope(laddr->ifa,
						     scope, 0) == 0) {
				continue;
			}
			if ((chunk_len != NULL) &&
			    (padding_len != NULL) &&
			    (*padding_len > 0)) {
				memset(mtod(m_at, caddr_t) + *chunk_len, 0, *padding_len);
				SCTP_BUF_LEN(m_at) += *padding_len;
				*chunk_len += *padding_len;
				*padding_len = 0;
			}
			m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa, chunk_len);
			cnt++;
			if (cnt >= SCTP_ADDRESS_LIMIT) {
				break;
			}
		}
	}
}
SCTP_IPI_ADDR_RUNLOCK();
return (m_at);
}

static struct sctp_ifa *
sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
		   uint8_t dest_is_loop,
		   uint8_t dest_is_priv,
		   sa_family_t fam)
{
uint8_t dest_is_global = 0;
/* dest_is_priv is true if destination is a private address */
/* dest_is_loop is true if destination is a loopback addresses */

/**
 * Here we determine if its a preferred address. A preferred address
 * means it is the same scope or higher scope then the destination.
 * L = loopback, P = private, G = global
 * -----------------------------------------
 *    src    |  dest | result
 *  ----------------------------------------
 *     L     |    L  |    yes
 *  -----------------------------------------
 *     P     |    L  |    yes-v4 no-v6
 *  -----------------------------------------
 *     G     |    L  |    yes-v4 no-v6
 *  -----------------------------------------
 *     L     |    P  |    no
 *  -----------------------------------------
 *     P     |    P  |    yes
 *  -----------------------------------------
 *     G     |    P  |    no
 *   -----------------------------------------
 *     L     |    G  |    no
 *   -----------------------------------------
 *     P     |    G  |    no
 *    -----------------------------------------
 *     G     |    G  |    yes
 *    -----------------------------------------
 */

if (ifa->address.sa.sa_family != fam) {
	/* forget mis-matched family */
	return (NULL);
}
if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
	dest_is_global = 1;
}
SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
/* Ok the address may be ok */
#ifdef INET6
if (fam == AF_INET6) {
	/* ok to use deprecated addresses? no lets not! */
	if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
		SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
		return (NULL);
	}
	if (ifa->src_is_priv && !ifa->src_is_loop) {
		if (dest_is_loop) {
			SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
			return (NULL);
		}
	}
	if (ifa->src_is_glob) {
		if (dest_is_loop) {
			SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
			return (NULL);
		}
	}
}
#endif
/* Now that we know what is what, implement or table
 * this could in theory be done slicker (it used to be), but this
 * is straightforward and easier to validate :-)
 */
SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
	ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
	dest_is_loop, dest_is_priv, dest_is_global);

if ((ifa->src_is_loop) && (dest_is_priv)) {
	SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
	return (NULL);
}
if ((ifa->src_is_glob) && (dest_is_priv)) {
	SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
	return (NULL);
}
if ((ifa->src_is_loop) && (dest_is_global)) {
	SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
	return (NULL);
}
if ((ifa->src_is_priv) && (dest_is_global)) {
	SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
	return (NULL);
}
SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
/* its a preferred address */
return (ifa);
}

static struct sctp_ifa *
sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
		    uint8_t dest_is_loop,
		    uint8_t dest_is_priv,
		    sa_family_t fam)
{
uint8_t dest_is_global = 0;

/**
 * Here we determine if its a acceptable address. A acceptable
 * address means it is the same scope or higher scope but we can
 * allow for NAT which means its ok to have a global dest and a
 * private src.
 *
 * L = loopback, P = private, G = global
 * -----------------------------------------
 *  src    |  dest | result
 * -----------------------------------------
 *   L     |   L   |    yes
 *  -----------------------------------------
 *   P     |   L   |    yes-v4 no-v6
 *  -----------------------------------------
 *   G     |   L   |    yes
 * -----------------------------------------
 *   L     |   P   |    no
 * -----------------------------------------
 *   P     |   P   |    yes
 * -----------------------------------------
 *   G     |   P   |    yes - May not work
 * -----------------------------------------
 *   L     |   G   |    no
 * -----------------------------------------
 *   P     |   G   |    yes - May not work
 * -----------------------------------------
 *   G     |   G   |    yes
 * -----------------------------------------
 */

if (ifa->address.sa.sa_family != fam) {
	/* forget non matching family */
	SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
		ifa->address.sa.sa_family, fam);
	return (NULL);
}
/* Ok the address may be ok */
SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
	dest_is_loop, dest_is_priv);
if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
	dest_is_global = 1;
}
#ifdef INET6
if (fam == AF_INET6) {
	/* ok to use deprecated addresses? */
	if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
		return (NULL);
	}
	if (ifa->src_is_priv) {
		/* Special case, linklocal to loop */
		if (dest_is_loop)
			return (NULL);
	}
}
#endif
/*
 * Now that we know what is what, implement our table.
 * This could in theory be done slicker (it used to be), but this
 * is straightforward and easier to validate :-)
 */
SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
	ifa->src_is_loop,
	dest_is_priv);
if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
	return (NULL);
}
SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
	ifa->src_is_loop,
	dest_is_global);
if ((ifa->src_is_loop == 1) && (dest_is_global)) {
	return (NULL);
}
SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
/* its an acceptable address */
return (ifa);
}

int
sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
{
struct sctp_laddr *laddr;

if (stcb == NULL) {
	/* There are no restrictions, no TCB :-) */
	return (0);
}
LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
	if (laddr->ifa == NULL) {
		SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
			__func__);
		continue;
	}
	if (laddr->ifa == ifa) {
		/* Yes it is on the list */
		return (1);
	}
}
return (0);
}

int
sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
{
struct sctp_laddr *laddr;

if (ifa == NULL)
	return (0);
LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
	if (laddr->ifa == NULL) {
		SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
			__func__);
		continue;
	}
	if ((laddr->ifa == ifa) && laddr->action == 0)
		/* same pointer */
		return (1);
}
return (0);
}

static struct sctp_ifa *
sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
		      sctp_route_t *ro,
		      uint32_t vrf_id,
		      int non_asoc_addr_ok,
		      uint8_t dest_is_priv,
		      uint8_t dest_is_loop,
		      sa_family_t fam)
{
struct sctp_laddr *laddr, *starting_point;
void *ifn;
int resettotop = 0;
struct sctp_ifn *sctp_ifn;
struct sctp_ifa *sctp_ifa, *sifa;
struct sctp_vrf *vrf;
uint32_t ifn_index;

vrf = sctp_find_vrf(vrf_id);
if (vrf == NULL)
	return (NULL);

ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
sctp_ifn = sctp_find_ifn(ifn, ifn_index);
/*
 * first question, is the ifn we will emit on in our list, if so, we
 * want such an address. Note that we first looked for a
 * preferred address.
 */
if (sctp_ifn) {
	/* is a preferred one on the interface we route out? */
	LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
#if defined(__FreeBSD__) && !defined(__Userspace__)
#ifdef INET
		if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
		    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
		                      &sctp_ifa->address.sin.sin_addr) != 0)) {
			continue;
		}
#endif
#ifdef INET6
		if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
		    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
		                      &sctp_ifa->address.sin6.sin6_addr) != 0)) {
			continue;
		}
#endif
#endif
		if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
		    (non_asoc_addr_ok == 0))
			continue;
		sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
						  dest_is_loop,
						  dest_is_priv, fam);
		if (sifa == NULL)
			continue;
		if (sctp_is_addr_in_ep(inp, sifa)) {
			atomic_add_int(&sifa->refcount, 1);
			return (sifa);
		}
	}
}
/*
 * ok, now we now need to find one on the list of the addresses.
 * We can't get one on the emitting interface so let's find first
 * a preferred one. If not that an acceptable one otherwise...
 * we return NULL.
 */
starting_point = inp->next_addr_touse;
once_again:
if (inp->next_addr_touse == NULL) {
	inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
	resettotop = 1;
}
for (laddr = inp->next_addr_touse; laddr;
     laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
	if (laddr->ifa == NULL) {
		/* address has been removed */
		continue;
	}
	if (laddr->action == SCTP_DEL_IP_ADDRESS) {
		/* address is being deleted */
		continue;
	}
	sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
					  dest_is_priv, fam);
	if (sifa == NULL)
		continue;
	atomic_add_int(&sifa->refcount, 1);
	return (sifa);
}
if (resettotop == 0) {
	inp->next_addr_touse = NULL;
	goto once_again;
}

inp->next_addr_touse = starting_point;
resettotop = 0;
once_again_too:
if (inp->next_addr_touse == NULL) {
	inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
	resettotop = 1;
}

/* ok, what about an acceptable address in the inp */
for (laddr = inp->next_addr_touse; laddr;
     laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
	if (laddr->ifa == NULL) {
		/* address has been removed */
		continue;
	}
	if (laddr->action == SCTP_DEL_IP_ADDRESS) {
		/* address is being deleted */
		continue;
	}
	sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
					   dest_is_priv, fam);
	if (sifa == NULL)
		continue;
	atomic_add_int(&sifa->refcount, 1);
	return (sifa);
}
if (resettotop == 0) {
	inp->next_addr_touse = NULL;
	goto once_again_too;
}

/*
 * no address bound can be a source for the destination we are in
 * trouble
 */
return (NULL);
}

static struct sctp_ifa *
sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
		       struct sctp_tcb *stcb,
		       sctp_route_t *ro,
		       uint32_t vrf_id,
		       uint8_t dest_is_priv,
		       uint8_t dest_is_loop,
		       int non_asoc_addr_ok,
		       sa_family_t fam)
{
struct sctp_laddr *laddr, *starting_point;
void *ifn;
struct sctp_ifn *sctp_ifn;
struct sctp_ifa *sctp_ifa, *sifa;
uint8_t start_at_beginning = 0;
struct sctp_vrf *vrf;
uint32_t ifn_index;

/*
 * first question, is the ifn we will emit on in our list, if so, we
 * want that one.
 */
vrf = sctp_find_vrf(vrf_id);
if (vrf == NULL)
	return (NULL);

ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
sctp_ifn = sctp_find_ifn(ifn, ifn_index);

/*
 * first question, is the ifn we will emit on in our list?  If so,
 * we want that one. First we look for a preferred. Second, we go
 * for an acceptable.
 */
if (sctp_ifn) {
	/* first try for a preferred address on the ep */
	LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
#if defined(__FreeBSD__) && !defined(__Userspace__)
#ifdef INET
		if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
		    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
		                      &sctp_ifa->address.sin.sin_addr) != 0)) {
			continue;
		}
#endif
#ifdef INET6
		if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
		    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
		                      &sctp_ifa->address.sin6.sin6_addr) != 0)) {
			continue;
		}
#endif
#endif
		if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
			continue;
		if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
			sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
			if (sifa == NULL)
				continue;
			if (((non_asoc_addr_ok == 0) &&
			     (sctp_is_addr_restricted(stcb, sifa))) ||
			    (non_asoc_addr_ok &&
			     (sctp_is_addr_restricted(stcb, sifa)) &&
			     (!sctp_is_addr_pending(stcb, sifa)))) {
				/* on the no-no list */
				continue;
			}
			atomic_add_int(&sifa->refcount, 1);
			return (sifa);
		}
	}
	/* next try for an acceptable address on the ep */
	LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
#if defined(__FreeBSD__) && !defined(__Userspace__)
#ifdef INET
		if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
		    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
		                      &sctp_ifa->address.sin.sin_addr) != 0)) {
			continue;
		}
#endif
#ifdef INET6
		if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
		    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
		                      &sctp_ifa->address.sin6.sin6_addr) != 0)) {
			continue;
		}
#endif
#endif
		if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
			continue;
		if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
			sifa= sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv,fam);
			if (sifa == NULL)
				continue;
			if (((non_asoc_addr_ok == 0) &&
			     (sctp_is_addr_restricted(stcb, sifa))) ||
			    (non_asoc_addr_ok &&
			     (sctp_is_addr_restricted(stcb, sifa)) &&
			     (!sctp_is_addr_pending(stcb, sifa)))) {
				/* on the no-no list */
				continue;
			}
			atomic_add_int(&sifa->refcount, 1);
			return (sifa);
		}
	}
}
/*
 * if we can't find one like that then we must look at all
 * addresses bound to pick one at first preferable then
 * secondly acceptable.
 */
starting_point = stcb->asoc.last_used_address;
sctp_from_the_top:
if (stcb->asoc.last_used_address == NULL) {
	start_at_beginning = 1;
	stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
}
/* search beginning with the last used address */
for (laddr = stcb->asoc.last_used_address; laddr;
     laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
	if (laddr->ifa == NULL) {
		/* address has been removed */
		continue;
	}
	if (laddr->action == SCTP_DEL_IP_ADDRESS) {
		/* address is being deleted */
		continue;
	}
	sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
	if (sifa == NULL)
		continue;
	if (((non_asoc_addr_ok == 0) &&
	     (sctp_is_addr_restricted(stcb, sifa))) ||
	    (non_asoc_addr_ok &&
	     (sctp_is_addr_restricted(stcb, sifa)) &&
	     (!sctp_is_addr_pending(stcb, sifa)))) {
		/* on the no-no list */
		continue;
	}
	stcb->asoc.last_used_address = laddr;
	atomic_add_int(&sifa->refcount, 1);
	return (sifa);
}
if (start_at_beginning == 0) {
	stcb->asoc.last_used_address = NULL;
	goto sctp_from_the_top;
}
/* now try for any higher scope than the destination */
stcb->asoc.last_used_address = starting_point;
start_at_beginning = 0;
sctp_from_the_top2:
if (stcb->asoc.last_used_address == NULL) {
	start_at_beginning = 1;
	stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
}
/* search beginning with the last used address */
for (laddr = stcb->asoc.last_used_address; laddr;
     laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
	if (laddr->ifa == NULL) {
		/* address has been removed */
		continue;
	}
	if (laddr->action == SCTP_DEL_IP_ADDRESS) {
		/* address is being deleted */
		continue;
	}
	sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
					   dest_is_priv, fam);
	if (sifa == NULL)
		continue;
	if (((non_asoc_addr_ok == 0) &&
	     (sctp_is_addr_restricted(stcb, sifa))) ||
	    (non_asoc_addr_ok &&
	     (sctp_is_addr_restricted(stcb, sifa)) &&
	     (!sctp_is_addr_pending(stcb, sifa)))) {
		/* on the no-no list */
		continue;
	}
	stcb->asoc.last_used_address = laddr;
	atomic_add_int(&sifa->refcount, 1);
	return (sifa);
}
if (start_at_beginning == 0) {
	stcb->asoc.last_used_address = NULL;
	goto sctp_from_the_top2;
}
return (NULL);
}

static struct sctp_ifa *
sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
#if defined(__FreeBSD__) && !defined(__Userspace__)
                                                struct sctp_inpcb *inp,
#else
                                                struct sctp_inpcb *inp SCTP_UNUSED,
#endif
                                                struct sctp_tcb *stcb,
                                                int non_asoc_addr_ok,
                                                uint8_t dest_is_loop,
                                                uint8_t dest_is_priv,
                                                int addr_wanted,
                                                sa_family_t fam,
                                                sctp_route_t *ro)
{
struct sctp_ifa *ifa, *sifa;
int num_eligible_addr = 0;
#ifdef INET6
#ifdef SCTP_EMBEDDED_V6_SCOPE
struct sockaddr_in6 sin6, lsa6;

if (fam == AF_INET6) {
	memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
#ifdef SCTP_KAME
	(void)sa6_recoverscope(&sin6);
#else
	(void)in6_recoverscope(&sin6, &sin6.sin6_addr, NULL);
#endif  /* SCTP_KAME */
}
#endif  /* SCTP_EMBEDDED_V6_SCOPE */
#endif	/* INET6 */
LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
#if defined(__FreeBSD__) && !defined(__Userspace__)
#ifdef INET
	if ((ifa->address.sa.sa_family == AF_INET) &&
	    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
	                      &ifa->address.sin.sin_addr) != 0)) {
		continue;
	}
#endif
#ifdef INET6
	if ((ifa->address.sa.sa_family == AF_INET6) &&
	    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
	                      &ifa->address.sin6.sin6_addr) != 0)) {
		continue;
	}
#endif
#endif
	if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
	    (non_asoc_addr_ok == 0))
		continue;
	sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
					  dest_is_priv, fam);
	if (sifa == NULL)
		continue;
#ifdef INET6
	if (fam == AF_INET6 &&
	    dest_is_loop &&
	    sifa->src_is_loop && sifa->src_is_priv) {
		/* don't allow fe80::1 to be a src on loop ::1, we don't list it
		 * to the peer so we will get an abort.
		 */
		continue;
	}
#ifdef SCTP_EMBEDDED_V6_SCOPE
	if (fam == AF_INET6 &&
	    IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
	    IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
		/* link-local <-> link-local must belong to the same scope. */
		memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
#ifdef SCTP_KAME
		(void)sa6_recoverscope(&lsa6);
#else
		(void)in6_recoverscope(&lsa6, &lsa6.sin6_addr, NULL);
#endif  /* SCTP_KAME */
		if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
			continue;
		}
	}
#endif  /* SCTP_EMBEDDED_V6_SCOPE */
#endif	/* INET6 */

#if defined(__FreeBSD__) || defined(__APPLE__) || defined(__Userspace__)
	/* Check if the IPv6 address matches to next-hop.
	   In the mobile case, old IPv6 address may be not deleted
	   from the interface. Then, the interface has previous and
	   new addresses.  We should use one corresponding to the
	   next-hop.  (by micchie)
	 */
#ifdef INET6
	if (stcb && fam == AF_INET6 &&
	    sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
		if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro) == 0) {
			continue;
		}
	}
#endif
#ifdef INET
	/* Avoid topologically incorrect IPv4 address */
	if (stcb && fam == AF_INET &&
	    sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
		if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
			continue;
		}
	}
#endif
#endif
	if (stcb) {
		if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
			continue;
		}
		if (((non_asoc_addr_ok == 0) &&
		     (sctp_is_addr_restricted(stcb, sifa))) ||
		    (non_asoc_addr_ok &&
		     (sctp_is_addr_restricted(stcb, sifa)) &&
		     (!sctp_is_addr_pending(stcb, sifa)))) {
			/*
			 * It is restricted for some reason..
			 * probably not yet added.
			 */
			continue;
		}
	}
	if (num_eligible_addr >= addr_wanted) {
		return (sifa);
	}
	num_eligible_addr++;
}
return (NULL);
}

static int
sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
#if defined(__FreeBSD__) && !defined(__Userspace__)
                                 struct sctp_inpcb *inp,
#else
                                 struct sctp_inpcb *inp SCTP_UNUSED,
#endif
			  struct sctp_tcb *stcb,
			  int non_asoc_addr_ok,
			  uint8_t dest_is_loop,
			  uint8_t dest_is_priv,
			  sa_family_t fam)
{
struct sctp_ifa *ifa, *sifa;
int num_eligible_addr = 0;

LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
#if defined(__FreeBSD__) && !defined(__Userspace__)
#ifdef INET
	if ((ifa->address.sa.sa_family == AF_INET) &&
	    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
	                      &ifa->address.sin.sin_addr) != 0)) {
		continue;
	}
#endif
#ifdef INET6
	if ((ifa->address.sa.sa_family == AF_INET6) &&
	    (stcb != NULL) &&
	    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
	                      &ifa->address.sin6.sin6_addr) != 0)) {
		continue;
	}
#endif
#endif
	if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
	    (non_asoc_addr_ok == 0)) {
		continue;
	}
	sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
					  dest_is_priv, fam);
	if (sifa == NULL) {
		continue;
	}
	if (stcb) {
		if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
			continue;
		}
		if (((non_asoc_addr_ok == 0) &&
		     (sctp_is_addr_restricted(stcb, sifa))) ||
		    (non_asoc_addr_ok &&
		     (sctp_is_addr_restricted(stcb, sifa)) &&
		     (!sctp_is_addr_pending(stcb, sifa)))) {
			/*
			 * It is restricted for some reason..
			 * probably not yet added.
			 */
			continue;
		}
	}
	num_eligible_addr++;
}
return (num_eligible_addr);
}

static struct sctp_ifa *
sctp_choose_boundall(struct sctp_inpcb *inp,
                    struct sctp_tcb *stcb,
	     struct sctp_nets *net,
	     sctp_route_t *ro,
	     uint32_t vrf_id,
	     uint8_t dest_is_priv,
	     uint8_t dest_is_loop,
	     int non_asoc_addr_ok,
	     sa_family_t fam)
{
int cur_addr_num = 0, num_preferred = 0;
void *ifn;
struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
struct sctp_ifa *sctp_ifa, *sifa;
uint32_t ifn_index;
struct sctp_vrf *vrf;
#ifdef INET
int retried = 0;
#endif

/*-
 * For boundall we can use any address in the association.
 * If non_asoc_addr_ok is set we can use any address (at least in
 * theory). So we look for preferred addresses first. If we find one,
 * we use it. Otherwise we next try to get an address on the
 * interface, which we should be able to do (unless non_asoc_addr_ok
 * is false and we are routed out that way). In these cases where we
 * can't use the address of the interface we go through all the
 * ifn's looking for an address we can use and fill that in. Punting
 * means we send back address 0, which will probably cause problems
 * actually since then IP will fill in the address of the route ifn,
 * which means we probably already rejected it.. i.e. here comes an
 * abort :-<.
 */
vrf = sctp_find_vrf(vrf_id);
if (vrf == NULL)
	return (NULL);

ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
SCTPDBG(SCTP_DEBUG_OUTPUT2,"ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
if (sctp_ifn == NULL) {
	/* ?? We don't have this guy ?? */
	SCTPDBG(SCTP_DEBUG_OUTPUT2,"No ifn emit interface?\n");
	goto bound_all_plan_b;
}
SCTPDBG(SCTP_DEBUG_OUTPUT2,"ifn_index:%d name:%s is emit interface\n",
	ifn_index, sctp_ifn->ifn_name);

if (net) {
	cur_addr_num = net->indx_of_eligible_next_to_use;
}
num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
						  inp, stcb,
						  non_asoc_addr_ok,
						  dest_is_loop,
						  dest_is_priv, fam);
SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
	num_preferred, sctp_ifn->ifn_name);
if (num_preferred == 0) {
	/*
	 * no eligible addresses, we must use some other interface
	 * address if we can find one.
	 */
	goto bound_all_plan_b;
}
/*
 * Ok we have num_eligible_addr set with how many we can use, this
 * may vary from call to call due to addresses being deprecated
 * etc..
 */
if (cur_addr_num >= num_preferred) {
	cur_addr_num = 0;
}
/*
 * select the nth address from the list (where cur_addr_num is the
 * nth) and 0 is the first one, 1 is the second one etc...
 */
SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);

sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
                                                                   dest_is_priv, cur_addr_num, fam, ro);

/* if sctp_ifa is NULL something changed??, fall to plan b. */
if (sctp_ifa) {
	atomic_add_int(&sctp_ifa->refcount, 1);
	if (net) {
		/* save off where the next one we will want */
		net->indx_of_eligible_next_to_use = cur_addr_num + 1;
	}
	return (sctp_ifa);
}
/*
 * plan_b: Look at all interfaces and find a preferred address. If
 * no preferred fall through to plan_c.
 */
bound_all_plan_b:
SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
		sctp_ifn->ifn_name);
	if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
		/* wrong base scope */
		SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
		continue;
	}
	if ((sctp_ifn == looked_at) && looked_at) {
		/* already looked at this guy */
		SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
		continue;
	}
	num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok,
                                                                 dest_is_loop, dest_is_priv, fam);
	SCTPDBG(SCTP_DEBUG_OUTPUT2,
		"Found ifn:%p %d preferred source addresses\n",
		ifn, num_preferred);
	if (num_preferred == 0) {
		/* None on this interface. */
		SCTPDBG(SCTP_DEBUG_OUTPUT2, "No preferred -- skipping to next\n");
		continue;
	}
	SCTPDBG(SCTP_DEBUG_OUTPUT2,
		"num preferred:%d on interface:%p cur_addr_num:%d\n",
		num_preferred, (void *)sctp_ifn, cur_addr_num);

	/*
	 * Ok we have num_eligible_addr set with how many we can
	 * use, this may vary from call to call due to addresses
	 * being deprecated etc..
	 */
	if (cur_addr_num >= num_preferred) {
		cur_addr_num = 0;
	}
	sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
                                                                       dest_is_priv, cur_addr_num, fam, ro);
	if (sifa == NULL)
		continue;
	if (net) {
		net->indx_of_eligible_next_to_use = cur_addr_num + 1;
		SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
			cur_addr_num);
		SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
		SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
	}
	atomic_add_int(&sifa->refcount, 1);
	return (sifa);
}
#ifdef INET
again_with_private_addresses_allowed:
#endif
/* plan_c: do we have an acceptable address on the emit interface */
sifa = NULL;
SCTPDBG(SCTP_DEBUG_OUTPUT2,"Trying Plan C: find acceptable on interface\n");
if (emit_ifn == NULL) {
	SCTPDBG(SCTP_DEBUG_OUTPUT2,"Jump to Plan D - no emit_ifn\n");
	goto plan_d;
}
LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
	SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
#if defined(__FreeBSD__) && !defined(__Userspace__)
#ifdef INET
	if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
	    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
	                      &sctp_ifa->address.sin.sin_addr) != 0)) {
		SCTPDBG(SCTP_DEBUG_OUTPUT2,"Jailed\n");
		continue;
	}
#endif
#ifdef INET6
	if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
	    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
	                      &sctp_ifa->address.sin6.sin6_addr) != 0)) {
		SCTPDBG(SCTP_DEBUG_OUTPUT2,"Jailed\n");
		continue;
	}
#endif
#endif
	if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
	    (non_asoc_addr_ok == 0)) {
		SCTPDBG(SCTP_DEBUG_OUTPUT2,"Defer\n");
		continue;
	}
	sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
					   dest_is_priv, fam);
	if (sifa == NULL) {
		SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
		continue;
	}
	if (stcb) {
		if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
			SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
			sifa = NULL;
			continue;
		}
		if (((non_asoc_addr_ok == 0) &&
		     (sctp_is_addr_restricted(stcb, sifa))) ||
		    (non_asoc_addr_ok &&
		     (sctp_is_addr_restricted(stcb, sifa)) &&
		     (!sctp_is_addr_pending(stcb, sifa)))) {
			/*
			 * It is restricted for some
			 * reason.. probably not yet added.
			 */
			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its restricted\n");
			sifa = NULL;
			continue;
		}
	}
	atomic_add_int(&sifa->refcount, 1);
	goto out;
}
plan_d:
/*
 * plan_d: We are in trouble. No preferred address on the emit
 * interface. And not even a preferred address on all interfaces.
 * Go out and see if we can find an acceptable address somewhere
 * amongst all interfaces.
 */
SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
	if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
		/* wrong base scope */
		continue;
	}
	LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
#if defined(__FreeBSD__) && !defined(__Userspace__)
#ifdef INET
		if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
		    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
		                      &sctp_ifa->address.sin.sin_addr) != 0)) {
			continue;
		}
#endif
#ifdef INET6
		if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
		    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
		                      &sctp_ifa->address.sin6.sin6_addr) != 0)) {
			continue;
		}
#endif
#endif
		if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
		    (non_asoc_addr_ok == 0))
			continue;
		sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
						   dest_is_loop,
						   dest_is_priv, fam);
		if (sifa == NULL)
			continue;
		if (stcb) {
			if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
				sifa = NULL;
				continue;
			}
			if (((non_asoc_addr_ok == 0) &&
			     (sctp_is_addr_restricted(stcb, sifa))) ||
			    (non_asoc_addr_ok &&
			     (sctp_is_addr_restricted(stcb, sifa)) &&
			     (!sctp_is_addr_pending(stcb, sifa)))) {
				/*
				 * It is restricted for some
				 * reason.. probably not yet added.
				 */
				sifa = NULL;
				continue;
			}
		}
		goto out;
	}
}
#ifdef INET
if (stcb) {
	if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
		stcb->asoc.scope.ipv4_local_scope = 1;
		retried = 1;
		goto again_with_private_addresses_allowed;
	} else if (retried == 1) {
		stcb->asoc.scope.ipv4_local_scope = 0;
	}
}
#endif
out:
#ifdef INET
if (sifa) {
	if (retried == 1) {
		LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
			if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
				/* wrong base scope */
				continue;
			}
			LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
				struct sctp_ifa *tmp_sifa;

#if defined(__FreeBSD__) && !defined(__Userspace__)
#ifdef INET
				if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
				    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
				                      &sctp_ifa->address.sin.sin_addr) != 0)) {
					continue;
				}
#endif
#ifdef INET6
				if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
				    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
				                      &sctp_ifa->address.sin6.sin6_addr) != 0)) {
					continue;
				}
#endif
#endif
				if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
				    (non_asoc_addr_ok == 0))
					continue;
				tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
				                                       dest_is_loop,
				                                       dest_is_priv, fam);
				if (tmp_sifa == NULL) {
					continue;
				}
				if (tmp_sifa == sifa) {
					continue;
				}
				if (stcb) {
					if (sctp_is_address_in_scope(tmp_sifa,
					                             &stcb->asoc.scope, 0) == 0) {
						continue;
					}
					if (((non_asoc_addr_ok == 0) &&
					     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
					    (non_asoc_addr_ok &&
					     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
					     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
						/*
						 * It is restricted for some
						 * reason.. probably not yet added.
						 */
						continue;
					}
				}
				if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
				    (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
					sctp_add_local_addr_restricted(stcb, tmp_sifa);
				}
			}
		}
	}
	atomic_add_int(&sifa->refcount, 1);
}
#endif
return (sifa);
}

/* tcb may be NULL */
struct sctp_ifa *
sctp_source_address_selection(struct sctp_inpcb *inp,
		      struct sctp_tcb *stcb,
		      sctp_route_t *ro,
		      struct sctp_nets *net,
		      int non_asoc_addr_ok, uint32_t vrf_id)
{
struct sctp_ifa *answer;
uint8_t dest_is_priv, dest_is_loop;
sa_family_t fam;
#ifdef INET
struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
#endif
#ifdef INET6
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
#endif

/**
 * Rules:
 * - Find the route if needed, cache if I can.
 * - Look at interface address in route, Is it in the bound list. If so we
 *   have the best source.
 * - If not we must rotate amongst the addresses.
 *
 * Caveats and issues
 *
 * Do we need to pay attention to scope. We can have a private address
 * or a global address we are sourcing or sending to. So if we draw
 * it out
 * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
 * For V4
 * ------------------------------------------
 *      source     *      dest  *  result
 * -----------------------------------------
 * <a>  Private    *    Global  *  NAT
 * -----------------------------------------
 * <b>  Private    *    Private *  No problem
 * -----------------------------------------
 * <c>  Global     *    Private *  Huh, How will this work?
 * -----------------------------------------
 * <d>  Global     *    Global  *  No Problem
 *------------------------------------------
 * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
 * For V6
 *------------------------------------------
 *      source     *      dest  *  result
 * -----------------------------------------
 * <a>  Linklocal  *    Global  *
 * -----------------------------------------
 * <b>  Linklocal  * Linklocal  *  No problem
 * -----------------------------------------
 * <c>  Global     * Linklocal  *  Huh, How will this work?
 * -----------------------------------------
 * <d>  Global     *    Global  *  No Problem
 *------------------------------------------
 * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
 *
 * And then we add to that what happens if there are multiple addresses
 * assigned to an interface. Remember the ifa on a ifn is a linked
 * list of addresses. So one interface can have more than one IP
 * address. What happens if we have both a private and a global
 * address? Do we then use context of destination to sort out which
 * one is best? And what about NAT's sending P->G may get you a NAT
 * translation, or should you select the G thats on the interface in
 * preference.
 *
 * Decisions:
 *
 * - count the number of addresses on the interface.
 * - if it is one, no problem except case <c>.
 *   For <a> we will assume a NAT out there.
 * - if there are more than one, then we need to worry about scope P
 *   or G. We should prefer G -> G and P -> P if possible.
 *   Then as a secondary fall back to mixed types G->P being a last
 *   ditch one.
 * - The above all works for bound all, but bound specific we need to
 *   use the same concept but instead only consider the bound
 *   addresses. If the bound set is NOT assigned to the interface then
 *   we must use rotation amongst the bound addresses..
 */
#if defined(__FreeBSD__) && !defined(__Userspace__)
if (ro->ro_nh == NULL) {
#else
if (ro->ro_rt == NULL) {
#endif
	/*
	 * Need a route to cache.
	 */
	SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
}
#if defined(__FreeBSD__) && !defined(__Userspace__)
if (ro->ro_nh == NULL) {
#else
if (ro->ro_rt == NULL) {
#endif
	return (NULL);
}
#if defined(_WIN32)
/* On Windows the sa_family is U_SHORT or ADDRESS_FAMILY */
fam = (sa_family_t)ro->ro_dst.sa_family;
#else
fam = ro->ro_dst.sa_family;
#endif
dest_is_priv = dest_is_loop = 0;
/* Setup our scopes for the destination */
switch (fam) {
#ifdef INET
case AF_INET:
	/* Scope based on outbound address */
	if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
		dest_is_loop = 1;
		if (net != NULL) {
			/* mark it as local */
			net->addr_is_local = 1;
		}
	} else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
		dest_is_priv = 1;
	}
	break;
#endif
#ifdef INET6
case AF_INET6:
	/* Scope based on outbound address */
#if defined(_WIN32)
	if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr)) {
#else
	if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
	    SCTP_ROUTE_IS_REAL_LOOP(ro)) {
#endif
		/*
		 * If the address is a loopback address, which
		 * consists of "::1" OR "fe80::1%lo0", we are loopback
		 * scope. But we don't use dest_is_priv (link local
		 * addresses).
		 */
		dest_is_loop = 1;
		if (net != NULL) {
			/* mark it as local */
			net->addr_is_local = 1;
		}
	} else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
		dest_is_priv = 1;
	}
	break;
#endif
}
SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
SCTP_IPI_ADDR_RLOCK();
if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
	/*
	 * Bound all case
	 */
	answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
				      dest_is_priv, dest_is_loop,
				      non_asoc_addr_ok, fam);
	SCTP_IPI_ADDR_RUNLOCK();
	return (answer);
}
/*
 * Subset bound case
 */
if (stcb) {
	answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
						vrf_id,	dest_is_priv,
						dest_is_loop,
						non_asoc_addr_ok, fam);
} else {
	answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
					       non_asoc_addr_ok,
					       dest_is_priv,
					       dest_is_loop, fam);
}
SCTP_IPI_ADDR_RUNLOCK();
return (answer);
}

static bool
sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
{
#if defined(_WIN32)
WSACMSGHDR cmh;
#else
struct cmsghdr cmh;
#endif
struct sctp_sndinfo sndinfo;
struct sctp_prinfo prinfo;
struct sctp_authinfo authinfo;
int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
bool found;

/*
 * Independent of how many mbufs, find the c_type inside the control
 * structure and copy out the data.
 */
found = false;
tot_len = SCTP_BUF_LEN(control);
for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
	rem_len = tot_len - off;
	if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
		/* There is not enough room for one more. */
		return (found);
	}
	m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
	if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
		/* We dont't have a complete CMSG header. */
		return (found);
	}
	if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
		/* We don't have the complete CMSG. */
		return (found);
	}
	cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
	cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
	if ((cmh.cmsg_level == IPPROTO_SCTP) &&
	    ((c_type == cmh.cmsg_type) ||
	     ((c_type == SCTP_SNDRCV) &&
	      ((cmh.cmsg_type == SCTP_SNDINFO) ||
	       (cmh.cmsg_type == SCTP_PRINFO) ||
	       (cmh.cmsg_type == SCTP_AUTHINFO))))) {
		if (c_type == cmh.cmsg_type) {
			if (cpsize > INT_MAX) {
				return (found);
			}
			if (cmsg_data_len < (int)cpsize) {
				return (found);
			}
			/* It is exactly what we want. Copy it out. */
			m_copydata(control, cmsg_data_off, (int)cpsize, (caddr_t)data);
			return (1);
		} else {
			struct sctp_sndrcvinfo *sndrcvinfo;

			sndrcvinfo = (struct sctp_sndrcvinfo *)data;
			if (!found) {
				if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
					return (found);
				}
				memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
			}
			switch (cmh.cmsg_type) {
			case SCTP_SNDINFO:
				if (cmsg_data_len < (int)sizeof(struct sctp_sndinfo)) {
					return (found);
				}
				m_copydata(control, cmsg_data_off, sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
				sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
				sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
				sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
				sndrcvinfo->sinfo_context = sndinfo.snd_context;
				sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
				break;
			case SCTP_PRINFO:
				if (cmsg_data_len < (int)sizeof(struct sctp_prinfo)) {
					return (found);
				}
				m_copydata(control, cmsg_data_off, sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
				if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
					sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
				} else {
					sndrcvinfo->sinfo_timetolive = 0;
				}
				sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
				break;
			case SCTP_AUTHINFO:
				if (cmsg_data_len < (int)sizeof(struct sctp_authinfo)) {
					return (found);
				}
				m_copydata(control, cmsg_data_off, sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
				sndrcvinfo->sinfo_keynumber_valid = 1;
				sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
				break;
			default:
				return (found);
			}
			found = true;
		}
	}
}
return (found);
}

static int
sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
{
#if defined(_WIN32)
WSACMSGHDR cmh;
#else
struct cmsghdr cmh;
#endif
struct sctp_initmsg initmsg;
#ifdef INET
struct sockaddr_in sin;
#endif
#ifdef INET6
struct sockaddr_in6 sin6;
#endif
int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;

tot_len = SCTP_BUF_LEN(control);
for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
	rem_len = tot_len - off;
	if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
		/* There is not enough room for one more. */
		*error = EINVAL;
		return (1);
	}
	m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
	if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
		/* We dont't have a complete CMSG header. */
		*error = EINVAL;
		return (1);
	}
	if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
		/* We don't have the complete CMSG. */
		*error = EINVAL;
		return (1);
	}
	cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
	cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
	if (cmh.cmsg_level == IPPROTO_SCTP) {
		switch (cmh.cmsg_type) {
		case SCTP_INIT:
			if (cmsg_data_len < (int)sizeof(struct sctp_initmsg)) {
				*error = EINVAL;
				return (1);
			}
			m_copydata(control, cmsg_data_off, sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
			if (initmsg.sinit_max_attempts)
				stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
			if (initmsg.sinit_num_ostreams)
				stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
			if (initmsg.sinit_max_instreams)
				stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
			if (initmsg.sinit_max_init_timeo)
				stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
			if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
				struct sctp_stream_out *tmp_str;
				unsigned int i;
#if defined(SCTP_DETAILED_STR_STATS)
				int j;
#endif

				/* Default is NOT correct */
				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
					stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
				SCTP_TCB_UNLOCK(stcb);
				SCTP_MALLOC(tmp_str,
				            struct sctp_stream_out *,
				            (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
				            SCTP_M_STRMO);
				SCTP_TCB_LOCK(stcb);
				if (tmp_str != NULL) {
					SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
					stcb->asoc.strmout = tmp_str;
					stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
				} else {
					stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
				}
				for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
					TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
					stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
					stcb->asoc.strmout[i].chunks_on_queues = 0;
#if defined(SCTP_DETAILED_STR_STATS)
					for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
						stcb->asoc.strmout[i].abandoned_sent[j] = 0;
						stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
					}
#else
					stcb->asoc.strmout[i].abandoned_sent[0] = 0;
					stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
#endif
					stcb->asoc.strmout[i].next_mid_ordered = 0;
					stcb->asoc.strmout[i].next_mid_unordered = 0;
					stcb->asoc.strmout[i].sid = i;
					stcb->asoc.strmout[i].last_msg_incomplete = 0;
					stcb->asoc.strmout[i].state = SCTP_STREAM_OPENING;
				}
			}
			break;
#ifdef INET
		case SCTP_DSTADDRV4:
			if (cmsg_data_len < (int)sizeof(struct in_addr)) {
				*error = EINVAL;
				return (1);
			}
			memset(&sin, 0, sizeof(struct sockaddr_in));
			sin.sin_family = AF_INET;
#ifdef HAVE_SIN_LEN
			sin.sin_len = sizeof(struct sockaddr_in);
#endif
			sin.sin_port = stcb->rport;
			m_copydata(control, cmsg_data_off, sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
			if ((sin.sin_addr.s_addr == INADDR_ANY) ||
			    (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
			    IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
				*error = EINVAL;
				return (1);
			}
			if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
			                         SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
				*error = ENOBUFS;
				return (1);
			}
			break;
#endif
#ifdef INET6
		case SCTP_DSTADDRV6:
			if (cmsg_data_len < (int)sizeof(struct in6_addr)) {
				*error = EINVAL;
				return (1);
			}
			memset(&sin6, 0, sizeof(struct sockaddr_in6));
			sin6.sin6_family = AF_INET6;
#ifdef HAVE_SIN6_LEN
			sin6.sin6_len = sizeof(struct sockaddr_in6);
#endif
			sin6.sin6_port = stcb->rport;
			m_copydata(control, cmsg_data_off, sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
			if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
			    IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
				*error = EINVAL;
				return (1);
			}
#ifdef INET
			if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
				in6_sin6_2_sin(&sin, &sin6);
				if ((sin.sin_addr.s_addr == INADDR_ANY) ||
				    (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
				    IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
					*error = EINVAL;
					return (1);
				}
				if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
				                         SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
					*error = ENOBUFS;
					return (1);
				}
			} else
#endif
				if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL, stcb->asoc.port,
				                         SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
					*error = ENOBUFS;
					return (1);
				}
			break;
#endif
		default:
			break;
		}
	}
}
return (0);
}

#if defined(INET) || defined(INET6)
static struct sctp_tcb *
sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
                          uint16_t port,
                          struct mbuf *control,
                          struct sctp_nets **net_p,
                          int *error)
{
#if defined(_WIN32)
WSACMSGHDR cmh;
#else
struct cmsghdr cmh;
#endif
struct sctp_tcb *stcb;
struct sockaddr *addr;
#ifdef INET
struct sockaddr_in sin;
#endif
#ifdef INET6
struct sockaddr_in6 sin6;
#endif
int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;

tot_len = SCTP_BUF_LEN(control);
for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
	rem_len = tot_len - off;
	if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
		/* There is not enough room for one more. */
		*error = EINVAL;
		return (NULL);
	}
	m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
	if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
		/* We dont't have a complete CMSG header. */
		*error = EINVAL;
		return (NULL);
	}
	if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
		/* We don't have the complete CMSG. */
		*error = EINVAL;
		return (NULL);
	}
	cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
	cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
	if (cmh.cmsg_level == IPPROTO_SCTP) {
		switch (cmh.cmsg_type) {
#ifdef INET
		case SCTP_DSTADDRV4:
			if (cmsg_data_len < (int)sizeof(struct in_addr)) {
				*error = EINVAL;
				return (NULL);
			}
			memset(&sin, 0, sizeof(struct sockaddr_in));
			sin.sin_family = AF_INET;
#ifdef HAVE_SIN_LEN
			sin.sin_len = sizeof(struct sockaddr_in);
#endif
			sin.sin_port = port;
			m_copydata(control, cmsg_data_off, sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
			addr = (struct sockaddr *)&sin;
			break;
#endif
#ifdef INET6
		case SCTP_DSTADDRV6:
			if (cmsg_data_len < (int)sizeof(struct in6_addr)) {
				*error = EINVAL;
				return (NULL);
			}
			memset(&sin6, 0, sizeof(struct sockaddr_in6));
			sin6.sin6_family = AF_INET6;
#ifdef HAVE_SIN6_LEN
			sin6.sin6_len = sizeof(struct sockaddr_in6);
#endif
			sin6.sin6_port = port;
			m_copydata(control, cmsg_data_off, sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
#ifdef INET
			if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
				in6_sin6_2_sin(&sin, &sin6);
				addr = (struct sockaddr *)&sin;
			} else
#endif
				addr = (struct sockaddr *)&sin6;
			break;
#endif
		default:
			addr = NULL;
			break;
		}
		if (addr) {
			stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
			if (stcb != NULL) {
				return (stcb);
			}
		}
	}
}
return (NULL);
}
#endif

static struct mbuf *
sctp_add_cookie(struct mbuf *init, int init_offset,
   struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t **signature)
{
struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
struct sctp_state_cookie *stc;
struct sctp_paramhdr *ph;
uint16_t cookie_sz;

mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
			      sizeof(struct sctp_paramhdr)), 0,
			     M_NOWAIT, 1, MT_DATA);
if (mret == NULL) {
	return (NULL);
}
copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
if (copy_init == NULL) {
	sctp_m_freem(mret);
	return (NULL);
}
#ifdef SCTP_MBUF_LOGGING
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
	sctp_log_mbc(copy_init, SCTP_MBUF_ICOPY);
}
#endif
copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
    M_NOWAIT);
if (copy_initack == NULL) {
	sctp_m_freem(mret);
	sctp_m_freem(copy_init);
	return (NULL);
}
#ifdef SCTP_MBUF_LOGGING
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
	sctp_log_mbc(copy_initack, SCTP_MBUF_ICOPY);
}
#endif
/* easy side we just drop it on the end */
ph = mtod(mret, struct sctp_paramhdr *);
SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
    sizeof(struct sctp_paramhdr);
stc = (struct sctp_state_cookie *)((caddr_t)ph +
    sizeof(struct sctp_paramhdr));
ph->param_type = htons(SCTP_STATE_COOKIE);
ph->param_length = 0;	/* fill in at the end */
/* Fill in the stc cookie data */
memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));

/* tack the INIT and then the INIT-ACK onto the chain */
cookie_sz = 0;
for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
	cookie_sz += SCTP_BUF_LEN(m_at);
	if (SCTP_BUF_NEXT(m_at) == NULL) {
		SCTP_BUF_NEXT(m_at) = copy_init;
		break;
	}
}
for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
	cookie_sz += SCTP_BUF_LEN(m_at);
	if (SCTP_BUF_NEXT(m_at) == NULL) {
		SCTP_BUF_NEXT(m_at) = copy_initack;
		break;
	}
}
for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
	cookie_sz += SCTP_BUF_LEN(m_at);
	if (SCTP_BUF_NEXT(m_at) == NULL) {
		break;
	}
}
sig = sctp_get_mbuf_for_msg(SCTP_SIGNATURE_SIZE, 0, M_NOWAIT, 1, MT_DATA);
if (sig == NULL) {
	/* no space, so free the entire chain */
	sctp_m_freem(mret);
	return (NULL);
}
SCTP_BUF_NEXT(m_at) = sig;
SCTP_BUF_LEN(sig) = SCTP_SIGNATURE_SIZE;
cookie_sz += SCTP_SIGNATURE_SIZE;
ph->param_length = htons(cookie_sz);
*signature = (uint8_t *)mtod(sig, caddr_t);
memset(*signature, 0, SCTP_SIGNATURE_SIZE);
return (mret);
}

static uint8_t
sctp_get_ect(struct sctp_tcb *stcb)
{
if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
	return (SCTP_ECT0_BIT);
} else {
	return (0);
}
}

#if defined(INET) || defined(INET6)
static void
sctp_handle_no_route(struct sctp_tcb *stcb,
                    struct sctp_nets *net,
                    int so_locked)
{
SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");

if (net) {
	SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
	if (net->dest_state & SCTP_ADDR_CONFIRMED) {
		if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
			SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
			sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
		                        stcb, 0,
		                        (void *)net,
		                        so_locked);
			net->dest_state &= ~SCTP_ADDR_REACHABLE;
			net->dest_state &= ~SCTP_ADDR_PF;
		}
	}
	if (stcb) {
		if (net == stcb->asoc.primary_destination) {
			/* need a new primary */
			struct sctp_nets *alt;

			alt = sctp_find_alternate_net(stcb, net, 0);
			if (alt != net) {
				if (stcb->asoc.alternate) {
					sctp_free_remote_addr(stcb->asoc.alternate);
				}
				stcb->asoc.alternate = alt;
				atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
				if (net->ro._s_addr) {
					sctp_free_ifa(net->ro._s_addr);
					net->ro._s_addr = NULL;
				}
				net->src_addr_selected = 0;
			}
		}
	}
}
}
#endif

static int
sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
   struct sctp_tcb *stcb,	/* may be NULL */
   struct sctp_nets *net,
   struct sockaddr *to,
   struct mbuf *m,
   uint32_t auth_offset,
   struct sctp_auth_chunk *auth,
   uint16_t auth_keyid,
   int nofragment_flag,
   int ecn_ok,
   int out_of_asoc_ok,
   uint16_t src_port,
   uint16_t dest_port,
   uint32_t v_tag,
   uint16_t port,
   union sctp_sockstore *over_addr,
#if defined(__FreeBSD__) && !defined(__Userspace__)
   uint8_t mflowtype, uint32_t mflowid,
#endif
   bool use_zero_crc,
   int so_locked)
/* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
{
/**
 * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
 * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
 * - fill in the HMAC digest of any AUTH chunk in the packet.
 * - calculate and fill in the SCTP checksum.
 * - prepend an IP address header.
 * - if boundall use INADDR_ANY.
 * - if boundspecific do source address selection.
 * - set fragmentation option for ipV4.
 * - On return from IP output, check/adjust mtu size of output
 *   interface and smallest_mtu size as well.
 */
/* Will need ifdefs around this */
struct mbuf *newm;
struct sctphdr *sctphdr;
int packet_length;
int ret;
#if defined(INET) || defined(INET6)
uint32_t vrf_id;
#endif
#if defined(INET) || defined(INET6)
struct mbuf *o_pak;
sctp_route_t *ro = NULL;
struct udphdr *udp = NULL;
#endif
uint8_t tos_value;
#if defined(__APPLE__) && !defined(__Userspace__)
struct socket *so = NULL;
#endif

#if defined(__APPLE__) && !defined(__Userspace__)
if (so_locked) {
	sctp_lock_assert(SCTP_INP_SO(inp));
	SCTP_TCB_LOCK_ASSERT(stcb);
} else {
	sctp_unlock_assert(SCTP_INP_SO(inp));
}
#endif
if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
	SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
	sctp_m_freem(m);
	return (EFAULT);
}
#if defined(INET) || defined(INET6)
if (stcb) {
	vrf_id = stcb->asoc.vrf_id;
} else {
	vrf_id = inp->def_vrf_id;
}
#endif
/* fill in the HMAC digest for any AUTH chunk in the packet */
if ((auth != NULL) && (stcb != NULL)) {
	sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
}

if (net) {
	tos_value = net->dscp;
} else if (stcb) {
	tos_value = stcb->asoc.default_dscp;
} else {
	tos_value = inp->sctp_ep.default_dscp;
}

switch (to->sa_family) {
#ifdef INET
case AF_INET:
{
	struct ip *ip = NULL;
	sctp_route_t iproute;
	int len;

	len = SCTP_MIN_V4_OVERHEAD;
	if (port) {
		len += sizeof(struct udphdr);
	}
	newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
	if (newm == NULL) {
		sctp_m_freem(m);
		SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
		return (ENOMEM);
	}
	SCTP_ALIGN_TO_END(newm, len);
	SCTP_BUF_LEN(newm) = len;
	SCTP_BUF_NEXT(newm) = m;
	m = newm;
#if defined(__FreeBSD__) && !defined(__Userspace__)
	if (net != NULL) {
		m->m_pkthdr.flowid = net->flowid;
		M_HASHTYPE_SET(m, net->flowtype);
	} else {
		m->m_pkthdr.flowid = mflowid;
		M_HASHTYPE_SET(m, mflowtype);
		}
#endif
	packet_length = sctp_calculate_len(m);
	ip = mtod(m, struct ip *);
	ip->ip_v = IPVERSION;
	ip->ip_hl = (sizeof(struct ip) >> 2);
	if (tos_value == 0) {
		/*
		 * This means especially, that it is not set at the
		 * SCTP layer. So use the value from the IP layer.
		 */
		tos_value = inp->ip_inp.inp.inp_ip_tos;
	}
	tos_value &= 0xfc;
	if (ecn_ok) {
		tos_value |= sctp_get_ect(stcb);
	}
	if ((nofragment_flag) && (port == 0)) {
#if defined(__FreeBSD__) && !defined(__Userspace__)
		ip->ip_off = htons(IP_DF);
#elif defined(WITH_CONVERT_IP_OFF) || defined(__APPLE__)
		ip->ip_off = IP_DF;
#else
		ip->ip_off = htons(IP_DF);
#endif
	} else {
#if defined(__FreeBSD__) && !defined(__Userspace__)
		ip->ip_off = htons(0);
#else
		ip->ip_off = 0;
#endif
	}
#if defined(__Userspace__)
	ip->ip_id = htons(SCTP_IP_ID(inp)++);
#elif defined(__FreeBSD__)
	/* FreeBSD has a function for ip_id's */
	ip_fillid(ip);
#elif defined(__APPLE__)
#if RANDOM_IP_ID
	ip->ip_id = ip_randomid();
#else
	ip->ip_id = htons(ip_id++);
#endif
#else
	ip->ip_id = SCTP_IP_ID(inp)++;
#endif

	ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
#if defined(__FreeBSD__) && !defined(__Userspace__)
	ip->ip_len = htons(packet_length);
#else
	ip->ip_len = packet_length;
#endif
	ip->ip_tos = tos_value;
	if (port) {
		ip->ip_p = IPPROTO_UDP;
	} else {
		ip->ip_p = IPPROTO_SCTP;
	}
	ip->ip_sum = 0;
	if (net == NULL) {
		ro = &iproute;
		memset(&iproute, 0, sizeof(iproute));
#ifdef HAVE_SA_LEN
		memcpy(&ro->ro_dst, to, to->sa_len);
#else
		memcpy(&ro->ro_dst, to, sizeof(struct sockaddr_in));
#endif
	} else {
		ro = (sctp_route_t *)&net->ro;
	}
	/* Now the address selection part */
	ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;

	/* call the routine to select the src address */
	if (net && out_of_asoc_ok == 0) {
		if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED|SCTP_ADDR_IFA_UNUSEABLE))) {
			sctp_free_ifa(net->ro._s_addr);
			net->ro._s_addr = NULL;
			net->src_addr_selected = 0;
#if defined(__FreeBSD__) && !defined(__Userspace__)
			RO_NHFREE(ro);
#else
			if (ro->ro_rt) {
				RTFREE(ro->ro_rt);
				ro->ro_rt = NULL;
			}
#endif
		}
		if (net->src_addr_selected == 0) {
			/* Cache the source address */
			net->ro._s_addr = sctp_source_address_selection(inp,stcb,
									ro, net, 0,
									vrf_id);
			net->src_addr_selected = 1;
		}
		if (net->ro._s_addr == NULL) {
			/* No route to host */
			net->src_addr_selected = 0;
			sctp_handle_no_route(stcb, net, so_locked);
			SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
			sctp_m_freem(m);
			return (EHOSTUNREACH);
		}
		ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
	} else {
		if (over_addr == NULL) {
			struct sctp_ifa *_lsrc;

			_lsrc = sctp_source_address_selection(inp, stcb, ro,
			                                      net,
			                                      out_of_asoc_ok,
			                                      vrf_id);
			if (_lsrc == NULL) {
				sctp_handle_no_route(stcb, net, so_locked);
				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
				sctp_m_freem(m);
				return (EHOSTUNREACH);
			}
			ip->ip_src = _lsrc->address.sin.sin_addr;
			sctp_free_ifa(_lsrc);
		} else {
			ip->ip_src = over_addr->sin.sin_addr;
			SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
		}
	}
	if (port) {
		if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
			sctp_handle_no_route(stcb, net, so_locked);
			SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
			sctp_m_freem(m);
			return (EHOSTUNREACH);
		}
		udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
		udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
		udp->uh_dport = port;
		udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip)));
#if !defined(__Userspace__)
#if defined(__FreeBSD__)
		if (V_udp_cksum) {
			udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
		} else {
			udp->uh_sum = 0;
		}
#else
		udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
#endif
#else
		udp->uh_sum = 0;
#endif
		sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
	} else {
		sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
	}

	sctphdr->src_port = src_port;
	sctphdr->dest_port = dest_port;
	sctphdr->v_tag = v_tag;
	sctphdr->checksum = 0;

	/*
	 * If source address selection fails and we find no route
	 * then the ip_output should fail as well with a
	 * NO_ROUTE_TO_HOST type error. We probably should catch
	 * that somewhere and abort the association right away
	 * (assuming this is an INIT being sent).
	 */
#if defined(__FreeBSD__) && !defined(__Userspace__)
	if (ro->ro_nh == NULL) {
#else
	if (ro->ro_rt == NULL) {
#endif
		/*
		 * src addr selection failed to find a route (or
		 * valid source addr), so we can't get there from
		 * here (yet)!
		 */
		sctp_handle_no_route(stcb, net, so_locked);
		SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
		sctp_m_freem(m);
		return (EHOSTUNREACH);
	}
	if (ro != &iproute) {
		memcpy(&iproute, ro, sizeof(*ro));
	}
	SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
		(uint32_t) (ntohl(ip->ip_src.s_addr)));
	SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
		(uint32_t)(ntohl(ip->ip_dst.s_addr)));
#if defined(__FreeBSD__) && !defined(__Userspace__)
	SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
		(void *)ro->ro_nh);
#else
	SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
		(void *)ro->ro_rt);
#endif

	if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
		/* failed to prepend data, give up */
		SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
		sctp_m_freem(m);
		return (ENOMEM);
	}
	SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
	if (port) {
		if (use_zero_crc) {
			SCTP_STAT_INCR(sctps_sendzerocrc);
		} else {
			sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
			SCTP_STAT_INCR(sctps_sendswcrc);
		}
#if !defined(__Userspace__)
#if defined(__FreeBSD__)
		if (V_udp_cksum) {
			SCTP_ENABLE_UDP_CSUM(o_pak);
		}
#else
		SCTP_ENABLE_UDP_CSUM(o_pak);
#endif
#endif
	} else {
		if (use_zero_crc) {
			SCTP_STAT_INCR(sctps_sendzerocrc);
		} else {
#if defined(__FreeBSD__) && !defined(__Userspace__)
			m->m_pkthdr.csum_flags = CSUM_SCTP;
			m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
			SCTP_STAT_INCR(sctps_sendhwcrc);
#else
			if (!(SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
			      (stcb) && (stcb->asoc.scope.loopback_scope))) {
				sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip));
				SCTP_STAT_INCR(sctps_sendswcrc);
			} else {
				SCTP_STAT_INCR(sctps_sendhwcrc);
			}
#endif
		}
	}
#ifdef SCTP_PACKET_LOGGING
	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
		sctp_packet_log(o_pak);
#endif
	/* send it out.  table id is taken from stcb */
#if defined(__APPLE__) && !defined(__Userspace__)
	if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
		so = SCTP_INP_SO(inp);
		SCTP_SOCKET_UNLOCK(so, 0);
	}
#endif
#if defined(__FreeBSD__) && !defined(__Userspace__)
	SCTP_PROBE5(send, NULL, stcb, ip, stcb, sctphdr);
#endif
	SCTP_IP_OUTPUT(ret, o_pak, ro, inp, vrf_id);
#if defined(__APPLE__) && !defined(__Userspace__)
	if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
		atomic_add_int(&stcb->asoc.refcnt, 1);
		SCTP_TCB_UNLOCK(stcb);
		SCTP_SOCKET_LOCK(so, 0);
		SCTP_TCB_LOCK(stcb);
		atomic_subtract_int(&stcb->asoc.refcnt, 1);
	}
#endif
#if defined(__FreeBSD__) && !defined(__Userspace__)
	if (port) {
		UDPSTAT_INC(udps_opackets);
	}
#endif
	SCTP_STAT_INCR(sctps_sendpackets);
	SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
	if (ret)
		SCTP_STAT_INCR(sctps_senderrors);

	SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
	if (net == NULL) {
		/* free tempy routes */
#if defined(__FreeBSD__) && !defined(__Userspace__)
		RO_NHFREE(ro);
#else
		if (ro->ro_rt) {
			RTFREE(ro->ro_rt);
			ro->ro_rt = NULL;
		}
#endif
	} else {
#if defined(__FreeBSD__) && !defined(__Userspace__)
		if ((ro->ro_nh != NULL) && (net->ro._s_addr) &&
#else
		if ((ro->ro_rt != NULL) && (net->ro._s_addr) &&
#endif
		    ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
			uint32_t mtu;

#if defined(__FreeBSD__) && !defined(__Userspace__)
			mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_nh);
#else
			mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
#endif
			if (mtu > 0) {
				if (net->port) {
					mtu -= sizeof(struct udphdr);
				}
				if (mtu < net->mtu) {
					net->mtu = mtu;
					if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
						sctp_pathmtu_adjustment(stcb, mtu, true);
					}
				}
			}
#if defined(__FreeBSD__) && !defined(__Userspace__)
		} else if (ro->ro_nh == NULL) {
#else
		} else if (ro->ro_rt == NULL) {
#endif
			/* route was freed */
			if (net->ro._s_addr &&
			    net->src_addr_selected) {
				sctp_free_ifa(net->ro._s_addr);
				net->ro._s_addr = NULL;
			}
			net->src_addr_selected = 0;
		}
	}
	return (ret);
}
#endif
#ifdef INET6
case AF_INET6:
{
	uint32_t flowlabel, flowinfo;
	struct ip6_hdr *ip6h;
	struct route_in6 ip6route;
#if !defined(__Userspace__)
	struct ifnet *ifp;
#endif
	struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
	int prev_scope = 0;
#ifdef SCTP_EMBEDDED_V6_SCOPE
	struct sockaddr_in6 lsa6_storage;
	int error;
#endif
	u_short prev_port = 0;
	int len;

	if (net) {
		flowlabel = net->flowlabel;
	} else if (stcb) {
		flowlabel = stcb->asoc.default_flowlabel;
	} else {
		flowlabel = inp->sctp_ep.default_flowlabel;
	}
	if (flowlabel == 0) {
		/*
		 * This means especially, that it is not set at the
		 * SCTP layer. So use the value from the IP layer.
		 */
#if defined(__APPLE__) && !defined(__Userspace__) && (!defined(APPLE_LEOPARD) && !defined(APPLE_SNOWLEOPARD) && !defined(APPLE_LION) && !defined(APPLE_MOUNTAINLION))
		flowlabel = ntohl(inp->ip_inp.inp.inp_flow);
#else
		flowlabel = ntohl(((struct inpcb *)inp)->inp_flow);
#endif
	}
	flowlabel &= 0x000fffff;
	len = SCTP_MIN_OVERHEAD;
	if (port) {
		len += sizeof(struct udphdr);
	}
	newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
	if (newm == NULL) {
		sctp_m_freem(m);
		SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
		return (ENOMEM);
	}
	SCTP_ALIGN_TO_END(newm, len);
	SCTP_BUF_LEN(newm) = len;
	SCTP_BUF_NEXT(newm) = m;
	m = newm;
#if defined(__FreeBSD__) && !defined(__Userspace__)
	if (net != NULL) {
		m->m_pkthdr.flowid = net->flowid;
		M_HASHTYPE_SET(m, net->flowtype);
	} else {
		m->m_pkthdr.flowid = mflowid;
		M_HASHTYPE_SET(m, mflowtype);
		}
#endif
	packet_length = sctp_calculate_len(m);

	ip6h = mtod(m, struct ip6_hdr *);
	/* protect *sin6 from overwrite */
	sin6 = (struct sockaddr_in6 *)to;
	tmp = *sin6;
	sin6 = &tmp;

#ifdef SCTP_EMBEDDED_V6_SCOPE
	/* KAME hack: embed scopeid */
#if defined(__APPLE__) && !defined(__Userspace__)
#if defined(APPLE_LEOPARD) || defined(APPLE_SNOWLEOPARD)
	if (in6_embedscope(&sin6->sin6_addr, sin6, NULL, NULL) != 0)
#else
	if (in6_embedscope(&sin6->sin6_addr, sin6, NULL, NULL, NULL) != 0)
#endif
#elif defined(SCTP_KAME)
	if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0)
#else
	if (in6_embedscope(&sin6->sin6_addr, sin6) != 0)
#endif
	{
		SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
		sctp_m_freem(m);
		return (EINVAL);
	}
#endif /* SCTP_EMBEDDED_V6_SCOPE */
	if (net == NULL) {
		memset(&ip6route, 0, sizeof(ip6route));
		ro = (sctp_route_t *)&ip6route;
#ifdef HAVE_SIN6_LEN
		memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
#else
		memcpy(&ro->ro_dst, sin6, sizeof(struct sockaddr_in6));
#endif
	} else {
		ro = (sctp_route_t *)&net->ro;
	}
	/*
	 * We assume here that inp_flow is in host byte order within
	 * the TCB!
	 */
	if (tos_value == 0) {
		/*
		 * This means especially, that it is not set at the
		 * SCTP layer. So use the value from the IP layer.
		 */
#if defined(__APPLE__) && !defined(__Userspace__) && (!defined(APPLE_LEOPARD) && !defined(APPLE_SNOWLEOPARD) && !defined(APPLE_LION) && !defined(APPLE_MOUNTAINLION))
		tos_value = (ntohl(inp->ip_inp.inp.inp_flow) >> 20) & 0xff;
#else
		tos_value = (ntohl(((struct inpcb *)inp)->inp_flow) >> 20) & 0xff;
#endif
	}
	tos_value &= 0xfc;
	if (ecn_ok) {
		tos_value |= sctp_get_ect(stcb);
	}
	flowinfo = 0x06;
	flowinfo <<= 8;
	flowinfo |= tos_value;
	flowinfo <<= 20;
	flowinfo |= flowlabel;
	ip6h->ip6_flow = htonl(flowinfo);
	if (port) {
		ip6h->ip6_nxt = IPPROTO_UDP;
	} else {
		ip6h->ip6_nxt = IPPROTO_SCTP;
	}
	ip6h->ip6_plen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
	ip6h->ip6_dst = sin6->sin6_addr;

	/*
	 * Add SRC address selection here: we can only reuse to a
	 * limited degree the kame src-addr-sel, since we can try
	 * their selection but it may not be bound.
	 */
	memset(&lsa6_tmp, 0, sizeof(lsa6_tmp));
	lsa6_tmp.sin6_family = AF_INET6;
#ifdef HAVE_SIN6_LEN
	lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
#endif
	lsa6 = &lsa6_tmp;
	if (net && out_of_asoc_ok == 0) {
		if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED|SCTP_ADDR_IFA_UNUSEABLE))) {
			sctp_free_ifa(net->ro._s_addr);
			net->ro._s_addr = NULL;
			net->src_addr_selected = 0;
#if defined(__FreeBSD__) && !defined(__Userspace__)
			RO_NHFREE(ro);
#else
			if (ro->ro_rt) {
				RTFREE(ro->ro_rt);
				ro->ro_rt = NULL;
			}
#endif
		}
		if (net->src_addr_selected == 0) {
#ifdef SCTP_EMBEDDED_V6_SCOPE
			sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
			/* KAME hack: embed scopeid */
#if defined(__APPLE__) && !defined(__Userspace__)
#if defined(APPLE_LEOPARD) || defined(APPLE_SNOWLEOPARD)
			if (in6_embedscope(&sin6->sin6_addr, sin6, NULL, NULL) != 0)
#else
			if (in6_embedscope(&sin6->sin6_addr, sin6, NULL, NULL, NULL) != 0)
#endif
#elif defined(SCTP_KAME)
			if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0)
#else
			if (in6_embedscope(&sin6->sin6_addr, sin6) != 0)
#endif
			{
				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
				sctp_m_freem(m);
				return (EINVAL);
			}
#endif /* SCTP_EMBEDDED_V6_SCOPE */
			/* Cache the source address */
			net->ro._s_addr = sctp_source_address_selection(inp,
									stcb,
									ro,
									net,
									0,
									vrf_id);
#ifdef SCTP_EMBEDDED_V6_SCOPE
#ifdef SCTP_KAME
			(void)sa6_recoverscope(sin6);
#else
			(void)in6_recoverscope(sin6, &sin6->sin6_addr, NULL);
#endif	/* SCTP_KAME */
#endif	/* SCTP_EMBEDDED_V6_SCOPE */
			net->src_addr_selected = 1;
		}
		if (net->ro._s_addr == NULL) {
			SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
			net->src_addr_selected = 0;
			sctp_handle_no_route(stcb, net, so_locked);
			SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
			sctp_m_freem(m);
			return (EHOSTUNREACH);
		}
		lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
	} else {
#ifdef SCTP_EMBEDDED_V6_SCOPE
		sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
		/* KAME hack: embed scopeid */
#if defined(__APPLE__) && !defined(__Userspace__)
#if defined(APPLE_LEOPARD) || defined(APPLE_SNOWLEOPARD)
		if (in6_embedscope(&sin6->sin6_addr, sin6, NULL, NULL) != 0)
#else
		if (in6_embedscope(&sin6->sin6_addr, sin6, NULL, NULL, NULL) != 0)
#endif
#elif defined(SCTP_KAME)
		if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0)
#else
		if (in6_embedscope(&sin6->sin6_addr, sin6) != 0)
#endif
		  {
			SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
			sctp_m_freem(m);
			return (EINVAL);
		  }
#endif /* SCTP_EMBEDDED_V6_SCOPE */
		if (over_addr == NULL) {
			struct sctp_ifa *_lsrc;

			_lsrc = sctp_source_address_selection(inp, stcb, ro,
			                                      net,
			                                      out_of_asoc_ok,
			                                      vrf_id);
			if (_lsrc == NULL) {
				sctp_handle_no_route(stcb, net, so_locked);
				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
				sctp_m_freem(m);
				return (EHOSTUNREACH);
			}
			lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
			sctp_free_ifa(_lsrc);
		} else {
			lsa6->sin6_addr = over_addr->sin6.sin6_addr;
			SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
		}
#ifdef SCTP_EMBEDDED_V6_SCOPE
#ifdef SCTP_KAME
		(void)sa6_recoverscope(sin6);
#else
		(void)in6_recoverscope(sin6, &sin6->sin6_addr, NULL);
#endif	/* SCTP_KAME */
#endif	/* SCTP_EMBEDDED_V6_SCOPE */
	}
	lsa6->sin6_port = inp->sctp_lport;

#if defined(__FreeBSD__) && !defined(__Userspace__)
	if (ro->ro_nh == NULL) {
#else
	if (ro->ro_rt == NULL) {
#endif
		/*
		 * src addr selection failed to find a route (or
		 * valid source addr), so we can't get there from
		 * here!
		 */
		sctp_handle_no_route(stcb, net, so_locked);
		SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
		sctp_m_freem(m);
		return (EHOSTUNREACH);
	}
#ifndef SCOPEDROUTING
#ifdef SCTP_EMBEDDED_V6_SCOPE
	/*
	 * XXX: sa6 may not have a valid sin6_scope_id in the
	 * non-SCOPEDROUTING case.
	 */
	memset(&lsa6_storage, 0, sizeof(lsa6_storage));
	lsa6_storage.sin6_family = AF_INET6;
#ifdef HAVE_SIN6_LEN
	lsa6_storage.sin6_len = sizeof(lsa6_storage);
#endif
#ifdef SCTP_KAME
	lsa6_storage.sin6_addr = lsa6->sin6_addr;
	if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
#else
	if ((error = in6_recoverscope(&lsa6_storage, &lsa6->sin6_addr,
	    NULL)) != 0) {
#endif				/* SCTP_KAME */
		SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
		sctp_m_freem(m);
		return (error);
	}
	/* XXX */
	lsa6_storage.sin6_addr = lsa6->sin6_addr;
	lsa6_storage.sin6_port = inp->sctp_lport;
	lsa6 = &lsa6_storage;
#endif /* SCTP_EMBEDDED_V6_SCOPE */
#endif /* SCOPEDROUTING */
	ip6h->ip6_src = lsa6->sin6_addr;

	if (port) {
		if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
			sctp_handle_no_route(stcb, net, so_locked);
			SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
			sctp_m_freem(m);
			return (EHOSTUNREACH);
		}
		udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
		udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
		udp->uh_dport = port;
		udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
		udp->uh_sum = 0;
		sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
	} else {
		sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
	}

	sctphdr->src_port = src_port;
	sctphdr->dest_port = dest_port;
	sctphdr->v_tag = v_tag;
	sctphdr->checksum = 0;

	/*
	 * We set the hop limit now since there is a good chance
	 * that our ro pointer is now filled
	 */
	ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
#if !defined(__Userspace__)
	ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
#endif

#ifdef SCTP_DEBUG
	/* Copy to be sure something bad is not happening */
	sin6->sin6_addr = ip6h->ip6_dst;
	lsa6->sin6_addr = ip6h->ip6_src;
#endif

	SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
	SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
	SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
	if (net) {
		sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
		/* preserve the port and scope for link local send */
		prev_scope = sin6->sin6_scope_id;
		prev_port = sin6->sin6_port;
	}

	if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
		/* failed to prepend data, give up */
		sctp_m_freem(m);
		SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
		return (ENOMEM);
	}
	SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
	if (port) {
		sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
		SCTP_STAT_INCR(sctps_sendswcrc);
#if !defined(__Userspace__)
#if defined(_WIN32)
		udp->uh_sum = 0;
#else
		if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
			udp->uh_sum = 0xffff;
		}
#endif
#endif
	} else {
#if defined(__FreeBSD__) && !defined(__Userspace__)
		m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
		m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
		SCTP_STAT_INCR(sctps_sendhwcrc);
#else
		if (!(SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
		      (stcb) && (stcb->asoc.scope.loopback_scope))) {
			sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr));
			SCTP_STAT_INCR(sctps_sendswcrc);
		} else {
			SCTP_STAT_INCR(sctps_sendhwcrc);
		}
#endif
	}
	/* send it out. table id is taken from stcb */
#if defined(__APPLE__) && !defined(__Userspace__)
	if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
		so = SCTP_INP_SO(inp);
		SCTP_SOCKET_UNLOCK(so, 0);
	}
#endif
#ifdef SCTP_PACKET_LOGGING
	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
		sctp_packet_log(o_pak);
#endif
#if !defined(__Userspace__)
#if defined(__FreeBSD__)
	SCTP_PROBE5(send, NULL, stcb, ip6h, stcb, sctphdr);
#endif
	SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, inp, vrf_id);
#else
	SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, NULL, inp, vrf_id);
#endif
#if defined(__APPLE__) && !defined(__Userspace__)
	if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
		atomic_add_int(&stcb->asoc.refcnt, 1);
		SCTP_TCB_UNLOCK(stcb);
		SCTP_SOCKET_LOCK(so, 0);
		SCTP_TCB_LOCK(stcb);
		atomic_subtract_int(&stcb->asoc.refcnt, 1);
	}
#endif
	if (net) {
		/* for link local this must be done */
		sin6->sin6_scope_id = prev_scope;
		sin6->sin6_port = prev_port;
	}
	SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
#if defined(__FreeBSD__) && !defined(__Userspace__)
	if (port) {
		UDPSTAT_INC(udps_opackets);
	}
#endif
	SCTP_STAT_INCR(sctps_sendpackets);
	SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
	if (ret) {
		SCTP_STAT_INCR(sctps_senderrors);
	}
	if (net == NULL) {
		/* Now if we had a temp route free it */
#if defined(__FreeBSD__) && !defined(__Userspace__)
		RO_NHFREE(ro);
#else
		if (ro->ro_rt) {
			RTFREE(ro->ro_rt);
			ro->ro_rt = NULL;
		}
#endif
	} else {
		/* PMTU check versus smallest asoc MTU goes here */
#if defined(__FreeBSD__) && !defined(__Userspace__)
		if (ro->ro_nh == NULL) {
#else
		if (ro->ro_rt == NULL) {
#endif
			/* Route was freed */
			if (net->ro._s_addr &&
			    net->src_addr_selected) {
				sctp_free_ifa(net->ro._s_addr);
				net->ro._s_addr = NULL;
			}
			net->src_addr_selected = 0;
		}
#if defined(__FreeBSD__) && !defined(__Userspace__)
		if ((ro->ro_nh != NULL) && (net->ro._s_addr) &&
#else
		if ((ro->ro_rt != NULL) && (net->ro._s_addr) &&
#endif
		    ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
			uint32_t mtu;

#if defined(__FreeBSD__) && !defined(__Userspace__)
			mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_nh);
#else
			mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
#endif
			if (mtu > 0) {
				if (net->port) {
					mtu -= sizeof(struct udphdr);
				}
				if (mtu < net->mtu) {
					net->mtu = mtu;
					if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
						sctp_pathmtu_adjustment(stcb, mtu, false);
					}
				}
			}
		}
#if !defined(__Userspace__)
		else if (ifp != NULL) {
#if defined(_WIN32)
#define ND_IFINFO(ifp)	(ifp)
#define linkmtu		if_mtu
#endif
			if ((ND_IFINFO(ifp)->linkmtu > 0) &&
			    (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
				sctp_pathmtu_adjustment(stcb, ND_IFINFO(ifp)->linkmtu, false);
			}
		}
#endif
	}
	return (ret);
}
#endif
#if defined(__Userspace__)
case AF_CONN:
{
	char *buffer;
	struct sockaddr_conn *sconn;
	int len;

	sconn = (struct sockaddr_conn *)to;
	len = sizeof(struct sctphdr);
	newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
	if (newm == NULL) {
		sctp_m_freem(m);
		SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
		return (ENOMEM);
	}
	SCTP_ALIGN_TO_END(newm, len);
	SCTP_BUF_LEN(newm) = len;
	SCTP_BUF_NEXT(newm) = m;
	m = newm;
	packet_length = sctp_calculate_len(m);
	m->m_pkthdr.len = packet_length;
	sctphdr = mtod(m, struct sctphdr *);
	sctphdr->src_port = src_port;
	sctphdr->dest_port = dest_port;
	sctphdr->v_tag = v_tag;
	sctphdr->checksum = 0;
	if (use_zero_crc) {
		SCTP_STAT_INCR(sctps_sendzerocrc);
	} else if (SCTP_BASE_VAR(crc32c_offloaded) == 0) {
		sctphdr->checksum = sctp_calculate_cksum(m, 0);
		SCTP_STAT_INCR(sctps_sendswcrc);
	} else {
		SCTP_STAT_INCR(sctps_sendhwcrc);
	}
	if (tos_value == 0) {
		tos_value = inp->ip_inp.inp.inp_ip_tos;
	}
	tos_value &= 0xfc;
	if (ecn_ok) {
		tos_value |= sctp_get_ect(stcb);
	}
	/* Don't alloc/free for each packet */
	if ((buffer = malloc(packet_length)) != NULL) {
		m_copydata(m, 0, packet_length, buffer);
		ret = SCTP_BASE_VAR(conn_output)(sconn->sconn_addr, buffer, packet_length, tos_value, nofragment_flag);
		free(buffer);
	} else {
		ret = ENOMEM;
	}
	sctp_m_freem(m);
	return (ret);
}
#endif
default:
	SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
	        ((struct sockaddr *)to)->sa_family);
	sctp_m_freem(m);
	SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
	return (EFAULT);
}
}

void
sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked)
{
struct mbuf *m, *m_last;
struct sctp_nets *net;
struct sctp_init_chunk *init;
struct sctp_supported_addr_param *sup_addr;
struct sctp_adaptation_layer_indication *ali;
struct sctp_zero_checksum_acceptable *zero_chksum;
struct sctp_supported_chunk_types_param *pr_supported;
struct sctp_paramhdr *ph;
int cnt_inits_to = 0;
int error;
uint16_t num_ext, chunk_len, padding_len, parameter_len;

#if defined(__APPLE__) && !defined(__Userspace__)
if (so_locked) {
	sctp_lock_assert(SCTP_INP_SO(inp));
} else {
	sctp_unlock_assert(SCTP_INP_SO(inp));
}
#endif
/* INIT's always go to the primary (and usually ONLY address) */
net = stcb->asoc.primary_destination;
if (net == NULL) {
	net = TAILQ_FIRST(&stcb->asoc.nets);
	if (net == NULL) {
		/* TSNH */
		return;
	}
	/* we confirm any address we send an INIT to */
	net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
	(void)sctp_set_primary_addr(stcb, NULL, net);
} else {
	/* we confirm any address we send an INIT to */
	net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
}
SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
#ifdef INET6
if (net->ro._l_addr.sa.sa_family == AF_INET6) {
	/*
	 * special hook, if we are sending to link local it will not
	 * show up in our private address count.
	 */
	if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
		cnt_inits_to = 1;
}
#endif
if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
	/* This case should not happen */
	SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
	return;
}
/* start the INIT timer */
sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);

m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
if (m == NULL) {
	/* No memory, INIT timer will re-attempt. */
	SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
	return;
}
chunk_len = (uint16_t)sizeof(struct sctp_init_chunk);
padding_len = 0;
/* Now lets put the chunk header in place */
init = mtod(m, struct sctp_init_chunk *);
/* now the chunk header */
init->ch.chunk_type = SCTP_INITIATION;
init->ch.chunk_flags = 0;
/* fill in later from mbuf we build */
init->ch.chunk_length = 0;
/* place in my tag */
init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
/* set up some of the credits. */
init->init.a_rwnd = htonl(max(inp->sctp_socket?SCTP_SB_LIMIT_RCV(inp->sctp_socket):0,
                              SCTP_MINIMAL_RWND));
init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);

/* Adaptation layer indication parameter */
if (inp->sctp_ep.adaptation_layer_indicator_provided) {
	parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
	ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t) + chunk_len);
	ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
	ali->ph.param_length = htons(parameter_len);
	ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
	chunk_len += parameter_len;
}

/* ECN parameter */
if (stcb->asoc.ecn_supported == 1) {
	parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
	ph = (struct sctp_paramhdr *)(mtod(m, caddr_t) + chunk_len);
	ph->param_type = htons(SCTP_ECN_CAPABLE);
	ph->param_length = htons(parameter_len);
	chunk_len += parameter_len;
}

/* PR-SCTP supported parameter */
if (stcb->asoc.prsctp_supported == 1) {
	parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
	ph = (struct sctp_paramhdr *)(mtod(m, caddr_t) + chunk_len);
	ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
	ph->param_length = htons(parameter_len);
	chunk_len += parameter_len;
}

/* Zero checksum acceptable parameter */
if (stcb->asoc.rcv_edmid != SCTP_EDMID_NONE) {
	parameter_len = (uint16_t)sizeof(struct sctp_zero_checksum_acceptable);
	zero_chksum = (struct sctp_zero_checksum_acceptable *)(mtod(m, caddr_t) + chunk_len);
	zero_chksum->ph.param_type = htons(SCTP_ZERO_CHECKSUM_ACCEPTABLE);
	zero_chksum->ph.param_length = htons(parameter_len);
	zero_chksum->edmid = htonl(stcb->asoc.rcv_edmid);
	chunk_len += parameter_len;
}

/* Add NAT friendly parameter. */
if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
	parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
	ph = (struct sctp_paramhdr *)(mtod(m, caddr_t) + chunk_len);
	ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
	ph->param_length = htons(parameter_len);
	chunk_len += parameter_len;
}

/* And now tell the peer which extensions we support */
num_ext = 0;
pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t) + chunk_len);
if (stcb->asoc.prsctp_supported == 1) {
	pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
	if (stcb->asoc.idata_supported) {
		pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
	}
}
if (stcb->asoc.auth_supported == 1) {
	pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
}
if (stcb->asoc.asconf_supported == 1) {
	pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
	pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
}
if (stcb->asoc.reconfig_supported == 1) {
	pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
}
if (stcb->asoc.idata_supported) {
	pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
}
if (stcb->asoc.nrsack_supported == 1) {
	pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
}
if (stcb->asoc.pktdrop_supported == 1) {
	pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
}
if (num_ext > 0) {
	parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
	pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
	pr_supported->ph.param_length = htons(parameter_len);
	padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
	chunk_len += parameter_len;
}
/* add authentication parameters */
if (stcb->asoc.auth_supported) {
	/* attach RANDOM parameter, if available */
	if (stcb->asoc.authinfo.random != NULL) {
		struct sctp_auth_random *randp;

		if (padding_len > 0) {
			memset(mtod(m, caddr_t) + chunk_len, 0, padding_len);
			chunk_len += padding_len;
			padding_len = 0;
		}
		randp = (struct sctp_auth_random *)(mtod(m, caddr_t) + chunk_len);
		parameter_len = (uint16_t)sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
		/* random key already contains the header */
		memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
		chunk_len += parameter_len;
	}
	/* add HMAC_ALGO parameter */
	if (stcb->asoc.local_hmacs != NULL) {
		struct sctp_auth_hmac_algo *hmacs;

		if (padding_len > 0) {
			memset(mtod(m, caddr_t) + chunk_len, 0, padding_len);
			chunk_len += padding_len;
			padding_len = 0;
		}
		hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t) + chunk_len);
		parameter_len = (uint16_t)(sizeof(struct sctp_auth_hmac_algo) +
		                           stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
		hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
		hmacs->ph.param_length = htons(parameter_len);
		sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *)hmacs->hmac_ids);
		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
		chunk_len += parameter_len;
	}
	/* add CHUNKS parameter */
	if (stcb->asoc.local_auth_chunks != NULL) {
		struct sctp_auth_chunk_list *chunks;

		if (padding_len > 0) {
			memset(mtod(m, caddr_t) + chunk_len, 0, padding_len);
			chunk_len += padding_len;
			padding_len = 0;
		}
		chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t) + chunk_len);
		parameter_len = (uint16_t)(sizeof(struct sctp_auth_chunk_list) +
		                           sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
		chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
		chunks->ph.param_length = htons(parameter_len);
		sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
		chunk_len += parameter_len;
	}
}

/* now any cookie time extensions */
if (stcb->asoc.cookie_preserve_req > 0) {
	struct sctp_cookie_perserve_param *cookie_preserve;

	if (padding_len > 0) {
		memset(mtod(m, caddr_t) + chunk_len, 0, padding_len);
		chunk_len += padding_len;
		padding_len = 0;
	}
	parameter_len = (uint16_t)sizeof(struct sctp_cookie_perserve_param);
	cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t) + chunk_len);
	cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
	cookie_preserve->ph.param_length = htons(parameter_len);
	cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
	stcb->asoc.cookie_preserve_req = 0;
	chunk_len += parameter_len;
}

if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
	uint8_t i;

	if (padding_len > 0) {
		memset(mtod(m, caddr_t) + chunk_len, 0, padding_len);
		chunk_len += padding_len;
		padding_len = 0;
	}
	parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
	if (stcb->asoc.scope.ipv4_addr_legal) {
		parameter_len += (uint16_t)sizeof(uint16_t);
	}
	if (stcb->asoc.scope.ipv6_addr_legal) {
		parameter_len += (uint16_t)sizeof(uint16_t);
	}
	sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t) + chunk_len);
	sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
	sup_addr->ph.param_length = htons(parameter_len);
	i = 0;
	if (stcb->asoc.scope.ipv4_addr_legal) {
		sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
	}
	if (stcb->asoc.scope.ipv6_addr_legal) {
		sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
	}
	padding_len = 4 - 2 * i;
	chunk_len += parameter_len;
}

SCTP_BUF_LEN(m) = chunk_len;
/* now the addresses */
/* To optimize this we could put the scoping stuff
 * into a structure and remove the individual uint8's from
 * the assoc structure. Then we could just sifa in the
 * address within the stcb. But for now this is a quick
 * hack to get the address stuff teased apart.
 */
m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
                                    m, cnt_inits_to,
                                    &padding_len, &chunk_len);

init->ch.chunk_length = htons(chunk_len);
if (padding_len > 0) {
	if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
		sctp_m_freem(m);
		return;
	}
}
SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
                                        (struct sockaddr *)&net->ro._l_addr,
                                        m, 0, NULL, 0, 0, 0, 0,
                                        inp->sctp_lport, stcb->rport, htonl(0),
                                        net->port, NULL,
#if defined(__FreeBSD__) && !defined(__Userspace__)
                                        0, 0,
#endif
                                        false, so_locked))) {
	SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
	if (error == ENOBUFS) {
		stcb->asoc.ifp_had_enobuf = 1;
		SCTP_STAT_INCR(sctps_lowlevelerr);
	}
} else {
	stcb->asoc.ifp_had_enobuf = 0;
}
SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
}

struct mbuf *
sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
                                     int param_offset, int *abort_processing,
                                     struct sctp_chunkhdr *cp,
                                     int *nat_friendly,
                                     int *cookie_found,
                                     uint32_t *edmid)
{
/*
 * Given a mbuf containing an INIT or INIT-ACK with the param_offset
 * being equal to the beginning of the params i.e. (iphlen +
 * sizeof(struct sctp_init_msg) parse through the parameters to the
 * end of the mbuf verifying that all parameters are known.
 *
 * For unknown parameters build and return a mbuf with
 * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
 * processing this chunk stop, and set *abort_processing to 1.
 *
 * By having param_offset be pre-set to where parameters begin it is
 * hoped that this routine may be reused in the future by new
 * features.
 */
struct sctp_zero_checksum_acceptable zero_chksum, *zero_chksum_p;
struct sctp_paramhdr *phdr, params;
struct mbuf *mat, *m_tmp, *op_err, *op_err_last;
int at, limit, pad_needed;
uint16_t ptype, plen, padded_size;

*abort_processing = 0;
if (cookie_found != NULL) {
	*cookie_found = 0;
}
if (edmid != NULL) {
	*edmid = SCTP_EDMID_NONE;
}
mat = in_initpkt;
limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
at = param_offset;
op_err = NULL;
op_err_last = NULL;
pad_needed = 0;
SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
	ptype = ntohs(phdr->param_type);
	plen = ntohs(phdr->param_length);
	if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
		/* wacked parameter */
		SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
		goto invalid_size;
	}
	limit -= SCTP_SIZE32(plen);
	/*-
	 * All parameters for all chunks that we know/understand are
	 * listed here. We process them other places and make
	 * appropriate stop actions per the upper bits. However this
	 * is the generic routine processor's can call to get back
	 * an operr.. to either incorporate (init-ack) or send.
	 */
	padded_size = SCTP_SIZE32(plen);
	switch (ptype) {
		/* Param's with variable size */
	case SCTP_HEARTBEAT_INFO:
	case SCTP_UNRECOG_PARAM:
	case SCTP_ERROR_CAUSE_IND:
		/* ok skip fwd */
		at += padded_size;
		break;
	case SCTP_STATE_COOKIE:
		if (cookie_found != NULL) {
			*cookie_found = 1;
		}
		at += padded_size;
		break;
		/* Param's with variable size within a range */
	case SCTP_CHUNK_LIST:
	case SCTP_SUPPORTED_CHUNK_EXT:
		if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
			goto invalid_size;
		}
		at += padded_size;
		break;
	case SCTP_SUPPORTED_ADDRTYPE:
		if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
			goto invalid_size;
		}
		at += padded_size;
		break;
	case SCTP_ZERO_CHECKSUM_ACCEPTABLE:
		if (padded_size != sizeof(struct sctp_zero_checksum_acceptable)) {
			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error checksum acceptable %d\n", plen);
			goto invalid_size;
		}
		if (edmid != NULL) {
			phdr = sctp_get_next_param(mat, at,
			                           (struct sctp_paramhdr *)&zero_chksum,
			                           sizeof(struct sctp_zero_checksum_acceptable));
			if (phdr != NULL) {
				zero_chksum_p = (struct sctp_zero_checksum_acceptable *)phdr;
				*edmid = ntohl(zero_chksum_p->edmid);
			}
		}
		at += padded_size;
		break;
	case SCTP_RANDOM:
		if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
			goto invalid_size;
		}
		at += padded_size;
		break;
	case SCTP_SET_PRIM_ADDR:
	case SCTP_DEL_IP_ADDRESS:
	case SCTP_ADD_IP_ADDRESS:
		if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
		    (padded_size != sizeof(struct sctp_asconf_addr_param))) {
			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
			goto invalid_size;
		}
		at += padded_size;
		break;
		/* Param's with a fixed size */
	case SCTP_IPV4_ADDRESS:
		if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
			goto invalid_size;
		}
		at += padded_size;
		break;
	case SCTP_IPV6_ADDRESS:
		if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
			goto invalid_size;
		}
		at += padded_size;
		break;
	case SCTP_COOKIE_PRESERVE:
		if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
			goto invalid_size;
		}
		at += padded_size;
		break;
	case SCTP_HAS_NAT_SUPPORT:
		if (padded_size != sizeof(struct sctp_paramhdr)) {
			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error nat support %d\n", plen);
			goto invalid_size;
		}
		*nat_friendly = 1;
		at += padded_size;
		break;
	case SCTP_PRSCTP_SUPPORTED:
		if (padded_size != sizeof(struct sctp_paramhdr)) {
			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp %d\n", plen);
			goto invalid_size;
		}
		at += padded_size;
		break;
	case SCTP_ECN_CAPABLE:
		if (padded_size != sizeof(struct sctp_paramhdr)) {
			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
			goto invalid_size;
		}
		at += padded_size;
		break;
	case SCTP_ULP_ADAPTATION:
		if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
			goto invalid_size;
		}
		at += padded_size;
		break;
	case SCTP_SUCCESS_REPORT:
		if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
			goto invalid_size;
		}
		at += padded_size;
		break;
	case SCTP_HOSTNAME_ADDRESS:
	{
		/* Hostname parameters are deprecated. */
		struct sctp_gen_error_cause *cause;
		int l_len;

		SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
		*abort_processing = 1;
		sctp_m_freem(op_err);
		op_err = NULL;
		op_err_last = NULL;
#ifdef INET6
		l_len = SCTP_MIN_OVERHEAD;
#else
		l_len = SCTP_MIN_V4_OVERHEAD;
#endif
		l_len += sizeof(struct sctp_chunkhdr);
		l_len += sizeof(struct sctp_gen_error_cause);
		op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
		if (op_err != NULL) {
			/*
			 * Pre-reserve space for IP, SCTP, and
			 * chunk header.
			 */
#ifdef INET6
			SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
#else
			SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
#endif
			SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
			SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
			SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
			cause = mtod(op_err, struct sctp_gen_error_cause *);
			cause->code = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
			cause->length = htons((uint16_t)(sizeof(struct sctp_gen_error_cause) + plen));
			SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(mat, at, plen, M_NOWAIT);
			if (SCTP_BUF_NEXT(op_err) == NULL) {
				sctp_m_freem(op_err);
				op_err = NULL;
				op_err_last = NULL;
			}
		}
		return (op_err);
	}
	default:
		/*
		 * we do not recognize the parameter figure out what
		 * we do.
		 */
		SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
		if ((ptype & 0x4000) == 0x4000) {
			/* Report bit is set?? */
			SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
			if (op_err == NULL) {
				int l_len;
				/* Ok need to try to get an mbuf */
#ifdef INET6
				l_len = SCTP_MIN_OVERHEAD;
#else
				l_len = SCTP_MIN_V4_OVERHEAD;
#endif
				l_len += sizeof(struct sctp_chunkhdr);
				l_len += sizeof(struct sctp_paramhdr);
				op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
				if (op_err) {
					SCTP_BUF_LEN(op_err) = 0;
#ifdef INET6
					SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
#else
					SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
#endif
					SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
					SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
					op_err_last = op_err;
				}
			}
			if (op_err != NULL) {
				/* If we have space */
				struct sctp_paramhdr *param;

				if (pad_needed > 0) {
					op_err_last = sctp_add_pad_tombuf(op_err_last, pad_needed);
				}
				if (op_err_last == NULL) {
					sctp_m_freem(op_err);
					op_err = NULL;
					op_err_last = NULL;
					goto more_processing;
				}
				if (M_TRAILINGSPACE(op_err_last) < (int)sizeof(struct sctp_paramhdr)) {
					m_tmp = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_NOWAIT, 1, MT_DATA);
					if (m_tmp == NULL) {
						sctp_m_freem(op_err);
						op_err = NULL;
						op_err_last = NULL;
						goto more_processing;
					}
					SCTP_BUF_LEN(m_tmp) = 0;
					SCTP_BUF_NEXT(m_tmp) = NULL;
					SCTP_BUF_NEXT(op_err_last) = m_tmp;
					op_err_last = m_tmp;
				}
				param = (struct sctp_paramhdr *)(mtod(op_err_last, caddr_t) + SCTP_BUF_LEN(op_err_last));
				param->param_type = htons(SCTP_UNRECOG_PARAM);
				param->param_length = htons((uint16_t)sizeof(struct sctp_paramhdr) + plen);
				SCTP_BUF_LEN(op_err_last) += sizeof(struct sctp_paramhdr);
				SCTP_BUF_NEXT(op_err_last) = SCTP_M_COPYM(mat, at, plen, M_NOWAIT);
				if (SCTP_BUF_NEXT(op_err_last) == NULL) {
					sctp_m_freem(op_err);
					op_err = NULL;
					op_err_last = NULL;
					goto more_processing;
				} else {
					while (SCTP_BUF_NEXT(op_err_last) != NULL) {
						op_err_last = SCTP_BUF_NEXT(op_err_last);
					}
				}
				if (plen % 4 != 0) {
					pad_needed = 4 - (plen % 4);
				} else {
					pad_needed = 0;
				}
			}
		}
	more_processing:
		if ((ptype & 0x8000) == 0x0000) {
			SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
			return (op_err);
		} else {
			/* skip this chunk and continue processing */
			SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
			at += SCTP_SIZE32(plen);
		}
		break;
	}
	phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
}
return (op_err);
invalid_size:
SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
*abort_processing = 1;
sctp_m_freem(op_err);
op_err = NULL;
op_err_last = NULL;
if (phdr != NULL) {
	struct sctp_paramhdr *param;
	int l_len;
#ifdef INET6
	l_len = SCTP_MIN_OVERHEAD;
#else
	l_len = SCTP_MIN_V4_OVERHEAD;
#endif
	l_len += sizeof(struct sctp_chunkhdr);
	l_len += (2 * sizeof(struct sctp_paramhdr));
	op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
	if (op_err) {
		SCTP_BUF_LEN(op_err) = 0;
#ifdef INET6
		SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
#else
		SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
#endif
		SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
		SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
		SCTP_BUF_LEN(op_err) = 2 * sizeof(struct sctp_paramhdr);
		param = mtod(op_err, struct sctp_paramhdr *);
		param->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
		param->param_length = htons(2 * sizeof(struct sctp_paramhdr));
		param++;
		param->param_type = htons(ptype);
		param->param_length = htons(plen);
	}
}
return (op_err);
}

/*
* Given a INIT chunk, look through the parameters to verify that there
* are no new addresses.
* Return true, if there is a new address or there is a problem parsing
  the parameters. Provide an optional error cause used when sending an ABORT.
* Return false, if there are no new addresses and there is no problem in
  parameter processing.
*/
static bool
sctp_are_there_new_addresses(struct sctp_association *asoc,
   struct mbuf *in_initpkt, int offset, int limit, struct sockaddr *src,
   struct mbuf **op_err)
{
struct sockaddr *sa_touse;
struct sockaddr *sa;
struct sctp_paramhdr *phdr, params;
struct sctp_nets *net;
#ifdef INET
struct sockaddr_in sin4, *sa4;
#endif
#ifdef INET6
struct sockaddr_in6 sin6, *sa6;
#endif
#if defined(__Userspace__)
struct sockaddr_conn *sac;
#endif
uint16_t ptype, plen;
bool fnd, check_src;

*op_err = NULL;
#ifdef INET
memset(&sin4, 0, sizeof(sin4));
sin4.sin_family = AF_INET;
#ifdef HAVE_SIN_LEN
sin4.sin_len = sizeof(sin4);
#endif
#endif
#ifdef INET6
memset(&sin6, 0, sizeof(sin6));
sin6.sin6_family = AF_INET6;
#ifdef HAVE_SIN6_LEN
sin6.sin6_len = sizeof(sin6);
#endif
#endif
/* First what about the src address of the pkt ? */
check_src = false;
switch (src->sa_family) {
#ifdef INET
case AF_INET:
	if (asoc->scope.ipv4_addr_legal) {
		check_src = true;
	}
	break;
#endif
#ifdef INET6
case AF_INET6:
	if (asoc->scope.ipv6_addr_legal) {
		check_src = true;
	}
	break;
#endif
#if defined(__Userspace__)
case AF_CONN:
	if (asoc->scope.conn_addr_legal) {
		check_src = true;
	}
	break;
#endif
default:
	/* TSNH */
	break;
}
if (check_src) {
	fnd = false;
	TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
		sa = (struct sockaddr *)&net->ro._l_addr;
		if (sa->sa_family == src->sa_family) {
#ifdef INET
			if (sa->sa_family == AF_INET) {
				struct sockaddr_in *src4;

				sa4 = (struct sockaddr_in *)sa;
				src4 = (struct sockaddr_in *)src;
				if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
					fnd = true;
					break;
				}
			}
#endif
#ifdef INET6
			if (sa->sa_family == AF_INET6) {
				struct sockaddr_in6 *src6;

				sa6 = (struct sockaddr_in6 *)sa;
				src6 = (struct sockaddr_in6 *)src;
				if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
					fnd = true;
					break;
				}
			}
#endif
#if defined(__Userspace__)
			if (sa->sa_family == AF_CONN) {
				struct sockaddr_conn *srcc;

				sac = (struct sockaddr_conn *)sa;
				srcc = (struct sockaddr_conn *)src;
				if (sac->sconn_addr == srcc->sconn_addr) {
					fnd = true;
					break;
				}
			}
#endif
		}
	}
	if (!fnd) {
		/*
		 * If sending an ABORT in case of an additional address,
		 * don't use the new address error cause.
		 * This looks no different than if no listener was
		 * present.
		 */
		*op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), "Address added");
		return (true);
	}
}
/* Ok so far lets munge through the rest of the packet */
offset += sizeof(struct sctp_init_chunk);
phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
while (phdr) {
	sa_touse = NULL;
	ptype = ntohs(phdr->param_type);
	plen = ntohs(phdr->param_length);
	if (offset + plen > limit) {
		*op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, "Partial parameter");
		return (true);
	}
	if (plen < sizeof(struct sctp_paramhdr)) {
		*op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, "Parameter length too small");
		return (true);
	}
	switch (ptype) {
#ifdef INET
	case SCTP_IPV4_ADDRESS:
	{
		struct sctp_ipv4addr_param *p4, p4_buf;

		if (plen != sizeof(struct sctp_ipv4addr_param)) {
			*op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, "Parameter length illegal");
			return (true);
		}
		phdr = sctp_get_next_param(in_initpkt, offset,
		    (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
		if (phdr == NULL) {
			*op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, "");
			return (true);
		}
		if (asoc->scope.ipv4_addr_legal) {
			p4 = (struct sctp_ipv4addr_param *)phdr;
			sin4.sin_addr.s_addr = p4->addr;
			sa_touse = (struct sockaddr *)&sin4;
		}
		break;
	}
#endif
#ifdef INET6
	case SCTP_IPV6_ADDRESS:
	{
		struct sctp_ipv6addr_param *p6, p6_buf;

		if (plen != sizeof(struct sctp_ipv6addr_param)) {
			*op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, "Parameter length illegal");
			return (true);
		}
		phdr = sctp_get_next_param(in_initpkt, offset,
		    (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
		if (phdr == NULL) {
			*op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, "");
			return (true);
		}
		if (asoc->scope.ipv6_addr_legal) {
			p6 = (struct sctp_ipv6addr_param *)phdr;
			memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
			       sizeof(p6->addr));
			sa_touse = (struct sockaddr *)&sin6;
		}
		break;
	}
#endif
	default:
		sa_touse = NULL;
		break;
	}
	if (sa_touse) {
		/* ok, sa_touse points to one to check */
		fnd = false;
		TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
			sa = (struct sockaddr *)&net->ro._l_addr;
			if (sa->sa_family != sa_touse->sa_family) {
				continue;
			}
#ifdef INET
			if (sa->sa_family == AF_INET) {
				sa4 = (struct sockaddr_in *)sa;
				if (sa4->sin_addr.s_addr ==
				    sin4.sin_addr.s_addr) {
					fnd = true;
					break;
				}
			}
#endif
#ifdef INET6
			if (sa->sa_family == AF_INET6) {
				sa6 = (struct sockaddr_in6 *)sa;
				if (SCTP6_ARE_ADDR_EQUAL(
				    sa6, &sin6)) {
					fnd = true;
					break;
				}
			}
#endif
		}
		if (!fnd) {
			/*
			 * If sending an ABORT in case of an additional
			 * address, don't use the new address error
			 * cause.
			 * This looks no different than if no listener
			 * was present.
			 */
			*op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), "Address added");
			return (true);
		}
	}
	offset += SCTP_SIZE32(plen);
	if (offset >= limit) {
		break;
	}
	phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
}
return (false);
}

/*
* Given a MBUF chain that was sent into us containing an INIT. Build a
* INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
* a pullup to include IPv6/4header, SCTP header and initial part of INIT
* message (i.e. the struct sctp_init_msg).
*/
void
sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
                      struct sctp_nets *src_net, struct mbuf *init_pkt,
                      int iphlen, int offset,
                      struct sockaddr *src, struct sockaddr *dst,
                      struct sctphdr *sh, struct sctp_init_chunk *init_chk,
#if defined(__FreeBSD__) && !defined(__Userspace__)
                      uint8_t mflowtype, uint32_t mflowid,
#endif
                      uint32_t vrf_id, uint16_t port)
{
struct sctp_association *asoc;
struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
struct sctp_init_ack_chunk *initack;
struct sctp_adaptation_layer_indication *ali;
struct sctp_zero_checksum_acceptable *zero_chksum;
struct sctp_supported_chunk_types_param *pr_supported;
struct sctp_paramhdr *ph;
union sctp_sockstore *over_addr;
struct sctp_scoping scp;
struct timeval now;
#ifdef INET
struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
struct sockaddr_in *src4 = (struct sockaddr_in *)src;
struct sockaddr_in *sin;
#endif
#ifdef INET6
struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
struct sockaddr_in6 *sin6;
#endif
#if defined(__Userspace__)
struct sockaddr_conn *dstconn = (struct sockaddr_conn *)dst;
struct sockaddr_conn *srcconn = (struct sockaddr_conn *)src;
struct sockaddr_conn *sconn;
#endif
struct sockaddr *to;
struct sctp_state_cookie stc;
struct sctp_nets *net = NULL;
uint8_t *signature = NULL;
int cnt_inits_to = 0;
uint16_t his_limit, i_want;
int abort_flag;
int nat_friendly = 0;
int error;
struct socket *so;
uint32_t edmid;
uint16_t num_ext, chunk_len, padding_len, parameter_len;
bool use_zero_crc;

if (stcb) {
	asoc = &stcb->asoc;
} else {
	asoc = NULL;
}
if ((asoc != NULL) &&
    (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) {
	if (sctp_are_there_new_addresses(asoc, init_pkt, offset, offset + ntohs(init_chk->ch.chunk_length), src, &op_err)) {
		/*
		 * new addresses, out of here in non-cookie-wait states
		 */
		sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
#if defined(__FreeBSD__) && !defined(__Userspace__)
		                mflowtype, mflowid, inp->fibnum,
#endif
		                vrf_id, port);
		return;
	}
	if (src_net != NULL && (src_net->port != port)) {
		/*
		 * change of remote encapsulation port, out of here in
		 * non-cookie-wait states
		 *
		 * Send an ABORT, without an specific error cause.
		 * This looks no different than if no listener
		 * was present.
		 */
		op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
		                             "Remote encapsulation port changed");
		sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
#if defined(__FreeBSD__) && !defined(__Userspace__)
		                mflowtype, mflowid, inp->fibnum,
#endif
		                vrf_id, port);
		return;
	}
}
abort_flag = 0;
op_err = sctp_arethere_unrecognized_parameters(init_pkt,
                                               (offset + sizeof(struct sctp_init_chunk)),
                                               &abort_flag,
                                               (struct sctp_chunkhdr *)init_chk,
                                               &nat_friendly, NULL, &edmid);
if (abort_flag) {
do_a_abort:
	if (op_err == NULL) {
		char msg[SCTP_DIAG_INFO_LEN];

		SCTP_SNPRINTF(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __func__);
		op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
		                             msg);
	}
	sctp_send_abort(init_pkt, iphlen, src, dst, sh,
			init_chk->init.initiate_tag, op_err,
#if defined(__FreeBSD__) && !defined(__Userspace__)
	                mflowtype, mflowid, inp->fibnum,
#endif
	                vrf_id, port);
	return;
}
m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
if (m == NULL) {
	/* No memory, INIT timer will re-attempt. */
	sctp_m_freem(op_err);
	return;
}
chunk_len = (uint16_t)sizeof(struct sctp_init_ack_chunk);
padding_len = 0;

/*
 * We might not overwrite the identification[] completely and on
 * some platforms time_entered will contain some padding.
 * Therefore zero out the cookie to avoid putting
 * uninitialized memory on the wire.
 */
memset(&stc, 0, sizeof(struct sctp_state_cookie));

/* the time I built cookie */
(void)SCTP_GETTIME_TIMEVAL(&now);
stc.time_entered.tv_sec = now.tv_sec;
stc.time_entered.tv_usec = now.tv_usec;

/* populate any tie tags */
if (asoc != NULL) {
	/* unlock before tag selections */
	stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
	stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
	stc.cookie_life = asoc->cookie_life;
	net = asoc->primary_destination;
} else {
	stc.tie_tag_my_vtag = 0;
	stc.tie_tag_peer_vtag = 0;
	/* life I will award this cookie */
	stc.cookie_life = inp->sctp_ep.def_cookie_life;
}

/* copy in the ports for later check */
stc.myport = sh->dest_port;
stc.peerport = sh->src_port;

/*
 * If we wanted to honor cookie life extensions, we would add to
 * stc.cookie_life. For now we should NOT honor any extension
 */
stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
	stc.ipv6_addr_legal = 1;
	if (SCTP_IPV6_V6ONLY(inp)) {
		stc.ipv4_addr_legal = 0;
	} else {
		stc.ipv4_addr_legal = 1;
	}
#if defined(__Userspace__)
	stc.conn_addr_legal = 0;
#endif
} else {
	stc.ipv6_addr_legal = 0;
#if defined(__Userspace__)
	if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_CONN) {
		stc.conn_addr_legal = 1;
		stc.ipv4_addr_legal = 0;
	} else {
		stc.conn_addr_legal = 0;
		stc.ipv4_addr_legal = 1;
	}
#else
	stc.ipv4_addr_legal = 1;
#endif
}
stc.ipv4_scope = 0;
if (net == NULL) {
	to = src;
	switch (dst->sa_family) {
#ifdef INET
	case AF_INET:
	{
		/* lookup address */
		stc.address[0] = src4->sin_addr.s_addr;
		stc.address[1] = 0;
		stc.address[2] = 0;
		stc.address[3] = 0;
		stc.addr_type = SCTP_IPV4_ADDRESS;
		/* local from address */
		stc.laddress[0] = dst4->sin_addr.s_addr;
		stc.laddress[1] = 0;
		stc.laddress[2] = 0;
		stc.laddress[3] = 0;
		stc.laddr_type = SCTP_IPV4_ADDRESS;
		/* scope_id is only for v6 */
		stc.scope_id = 0;
		if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
		    (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
			stc.ipv4_scope = 1;
		}
		/* Must use the address in this case */
		if (sctp_is_address_on_local_host(src, vrf_id)) {
			stc.loopback_scope = 1;
			stc.ipv4_scope = 1;
			stc.site_scope = 1;
			stc.local_scope = 0;
		}
		break;
	}
#endif
#ifdef INET6
	case AF_INET6:
	{
		stc.addr_type = SCTP_IPV6_ADDRESS;
		memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
#if defined(__FreeBSD__) && !defined(__Userspace__)
		stc.scope_id = ntohs(in6_getscope(&src6->sin6_addr));
#else
		stc.scope_id = 0;
#endif
		if (sctp_is_address_on_local_host(src, vrf_id)) {
			stc.loopback_scope = 1;
			stc.local_scope = 0;
			stc.site_scope = 1;
			stc.ipv4_scope = 1;
		} else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
		           IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
			/*
			 * If the new destination or source is a
			 * LINK_LOCAL we must have common both site and
			 * local scope. Don't set local scope though
			 * since we must depend on the source to be
			 * added implicitly. We cannot assure just
			 * because we share one link that all links are
			 * common.
			 */
#if defined(__APPLE__) && !defined(__Userspace__)
			/* Mac OS X currently doesn't have in6_getscope() */
			stc.scope_id = src6->sin6_addr.s6_addr16[1];
#endif
			stc.local_scope = 0;
			stc.site_scope = 1;
			stc.ipv4_scope = 1;
			/*
			 * we start counting for the private address
			 * stuff at 1. since the link local we
			 * source from won't show up in our scoped
			 * count.
			 */
			cnt_inits_to = 1;
			/* pull out the scope_id from incoming pkt */
		} else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
		           IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
			/*
			 * If the new destination or source is
			 * SITE_LOCAL then we must have site scope in
			 * common.
			 */
			stc.site_scope = 1;
		}
		memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
		stc.laddr_type = SCTP_IPV6_ADDRESS;
		break;
	}
#endif
#if defined(__Userspace__)
	case AF_CONN:
	{
		/* lookup address */
		stc.address[0] = 0;
		stc.address[1] = 0;
		stc.address[2] = 0;
		stc.address[3] = 0;
		memcpy(&stc.address, &srcconn->sconn_addr, sizeof(void *));
		stc.addr_type = SCTP_CONN_ADDRESS;
		/* local from address */
		stc.laddress[0] = 0;
		stc.laddress[1] = 0;
		stc.laddress[2] = 0;
		stc.laddress[3] = 0;
		memcpy(&stc.laddress, &dstconn->sconn_addr, sizeof(void *));
		stc.laddr_type = SCTP_CONN_ADDRESS;
		/* scope_id is only for v6 */
		stc.scope_id = 0;
		break;
	}
#endif
	default:
		/* TSNH */
		goto do_a_abort;
		break;
	}
} else {
	/* set the scope per the existing tcb */

#ifdef INET6
	struct sctp_nets *lnet;
#endif

	stc.loopback_scope = asoc->scope.loopback_scope;
	stc.ipv4_scope = asoc->scope.ipv4_local_scope;
	stc.site_scope = asoc->scope.site_scope;
	stc.local_scope = asoc->scope.local_scope;
#ifdef INET6
	/* Why do we not consider IPv4 LL addresses? */
	TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
		if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
			if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
				/*
				 * if we have a LL address, start
				 * counting at 1.
				 */
				cnt_inits_to = 1;
			}
		}
	}
#endif
	/* use the net pointer */
	to = (struct sockaddr *)&net->ro._l_addr;
	switch (to->sa_family) {
#ifdef INET
	case AF_INET:
		sin = (struct sockaddr_in *)to;
		stc.address[0] = sin->sin_addr.s_addr;
		stc.address[1] = 0;
		stc.address[2] = 0;
		stc.address[3] = 0;
		stc.addr_type = SCTP_IPV4_ADDRESS;
		if (net->src_addr_selected == 0) {
			/*
			 * strange case here, the INIT should have
			 * did the selection.
			 */
			net->ro._s_addr = sctp_source_address_selection(inp,
									stcb, (sctp_route_t *)&net->ro,
									net, 0, vrf_id);
			if (net->ro._s_addr == NULL) {
				sctp_m_freem(op_err);
				sctp_m_freem(m);
				return;
			}

			net->src_addr_selected = 1;
		}
		stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
		stc.laddress[1] = 0;
		stc.laddress[2] = 0;
		stc.laddress[3] = 0;
		stc.laddr_type = SCTP_IPV4_ADDRESS;
		/* scope_id is only for v6 */
		stc.scope_id = 0;
		break;
#endif
#ifdef INET6
	case AF_INET6:
		sin6 = (struct sockaddr_in6 *)to;
		memcpy(&stc.address, &sin6->sin6_addr,
		       sizeof(struct in6_addr));
		stc.addr_type = SCTP_IPV6_ADDRESS;
		stc.scope_id = sin6->sin6_scope_id;
		if (net->src_addr_selected == 0) {
			/*
			 * strange case here, the INIT should have
			 * done the selection.
			 */
			net->ro._s_addr = sctp_source_address_selection(inp,
									stcb, (sctp_route_t *)&net->ro,
									net, 0, vrf_id);
			if (net->ro._s_addr == NULL) {
				sctp_m_freem(op_err);
				sctp_m_freem(m);
				return;
			}

			net->src_addr_selected = 1;
		}
		memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
		       sizeof(struct in6_addr));
		stc.laddr_type = SCTP_IPV6_ADDRESS;
		break;
#endif
#if defined(__Userspace__)
	case AF_CONN:
		sconn = (struct sockaddr_conn *)to;
		stc.address[0] = 0;
		stc.address[1] = 0;
		stc.address[2] = 0;
		stc.address[3] = 0;
		memcpy(&stc.address, &sconn->sconn_addr, sizeof(void *));
		stc.addr_type = SCTP_CONN_ADDRESS;
		stc.laddress[0] = 0;
		stc.laddress[1] = 0;
		stc.laddress[2] = 0;
		stc.laddress[3] = 0;
		memcpy(&stc.laddress, &sconn->sconn_addr, sizeof(void *));
		stc.laddr_type = SCTP_CONN_ADDRESS;
		stc.scope_id = 0;
		break;
#endif
	}
}
if (asoc != NULL) {
	stc.rcv_edmid = asoc->rcv_edmid;
} else {
	stc.rcv_edmid = inp->rcv_edmid;
}
/* Now lets put the SCTP header in place */
initack = mtod(m, struct sctp_init_ack_chunk *);
/* Save it off for quick ref */
stc.peers_vtag = ntohl(init_chk->init.initiate_tag);
/* who are we */
memcpy(stc.identification, SCTP_VERSION_STRING,
       min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
/* now the chunk header */
initack->ch.chunk_type = SCTP_INITIATION_ACK;
initack->ch.chunk_flags = 0;
/* fill in later from mbuf we build */
initack->ch.chunk_length = 0;
/* place in my tag */
if ((asoc != NULL) &&
    ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
     (SCTP_GET_STATE(stcb) == SCTP_STATE_INUSE) ||
     (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED))) {
	/* re-use the v-tags and init-seq here */
	initack->init.initiate_tag = htonl(asoc->my_vtag);
	initack->init.initial_tsn = htonl(asoc->init_seq_number);
} else {
	uint32_t vtag, itsn;

	if (asoc) {
		atomic_add_int(&asoc->refcnt, 1);
		SCTP_TCB_UNLOCK(stcb);
	new_tag:
		SCTP_INP_INFO_RLOCK();
		vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
		SCTP_INP_INFO_RUNLOCK();
		if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
			/* Got a duplicate vtag on some guy behind a nat
			 * make sure we don't use it.
			 */
			goto new_tag;
		}
		initack->init.initiate_tag = htonl(vtag);
		/* get a TSN to use too */
		itsn = sctp_select_initial_TSN(&inp->sctp_ep);
		initack->init.initial_tsn = htonl(itsn);
		SCTP_TCB_LOCK(stcb);
		atomic_subtract_int(&asoc->refcnt, 1);
	} else {
		SCTP_INP_INCR_REF(inp);
		SCTP_INP_RUNLOCK(inp);
		SCTP_INP_INFO_RLOCK();
		vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
		SCTP_INP_INFO_RUNLOCK();
		initack->init.initiate_tag = htonl(vtag);
		/* get a TSN to use too */
		initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
		SCTP_INP_RLOCK(inp);
		SCTP_INP_DECR_REF(inp);
	}
}
/* save away my tag to */
stc.my_vtag = initack->init.initiate_tag;

/* set up some of the credits. */
so = inp->sctp_socket;
if (so == NULL) {
	/* memory problem */
	sctp_m_freem(op_err);
	sctp_m_freem(m);
	return;
} else {
	initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
}
/* set what I want */
his_limit = ntohs(init_chk->init.num_inbound_streams);
/* choose what I want */
if (asoc != NULL) {
	if (asoc->streamoutcnt > asoc->pre_open_streams) {
		i_want = asoc->streamoutcnt;
	} else {
		i_want = asoc->pre_open_streams;
	}
} else {
	i_want = inp->sctp_ep.pre_open_stream_count;
}
if (his_limit < i_want) {
	/* I Want more :< */
	initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
} else {
	/* I can have what I want :> */
	initack->init.num_outbound_streams = htons(i_want);
}
/* tell him his limit. */
initack->init.num_inbound_streams =
	htons(inp->sctp_ep.max_open_streams_intome);

/* adaptation layer indication parameter */
if (inp->sctp_ep.adaptation_layer_indicator_provided) {
	parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
	ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t) + chunk_len);
	ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
	ali->ph.param_length = htons(parameter_len);
	ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
	chunk_len += parameter_len;
}

/* ECN parameter */
if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
    ((asoc == NULL) && (inp->ecn_supported == 1))) {
	parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
	ph = (struct sctp_paramhdr *)(mtod(m, caddr_t) + chunk_len);
	ph->param_type = htons(SCTP_ECN_CAPABLE);
	ph->param_length = htons(parameter_len);
	chunk_len += parameter_len;
}

/* PR-SCTP supported parameter */
if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
    ((asoc == NULL) && (inp->prsctp_supported == 1))) {
	parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
	ph = (struct sctp_paramhdr *)(mtod(m, caddr_t) + chunk_len);
	ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
	ph->param_length = htons(parameter_len);
	chunk_len += parameter_len;
}

/* Zero checksum acceptable parameter */
if (((asoc != NULL) && (asoc->rcv_edmid != SCTP_EDMID_NONE)) ||
    ((asoc == NULL) && (inp->rcv_edmid != SCTP_EDMID_NONE))) {
	parameter_len = (uint16_t)sizeof(struct sctp_zero_checksum_acceptable);
	zero_chksum = (struct sctp_zero_checksum_acceptable *)(mtod(m, caddr_t) + chunk_len);
	zero_chksum->ph.param_type = htons(SCTP_ZERO_CHECKSUM_ACCEPTABLE);
	zero_chksum->ph.param_length = htons(parameter_len);
	if (asoc != NULL) {
		zero_chksum->edmid = htonl(asoc->rcv_edmid);
	} else {
		zero_chksum->edmid = htonl(inp->rcv_edmid);
	}
	chunk_len += parameter_len;
}

/* Add NAT friendly parameter */
if (nat_friendly) {
	parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
	ph = (struct sctp_paramhdr *)(mtod(m, caddr_t) + chunk_len);
	ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
	ph->param_length = htons(parameter_len);
	chunk_len += parameter_len;
}

/* And now tell the peer which extensions we support */
num_ext = 0;
pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t) + chunk_len);
if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
    ((asoc == NULL) && (inp->prsctp_supported == 1))) {
	pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
	if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
	    ((asoc == NULL) && (inp->idata_supported == 1))) {
		pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
	}
}
if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
    ((asoc == NULL) && (inp->auth_supported == 1))) {
	pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
}
if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
    ((asoc == NULL) && (inp->asconf_supported == 1))) {
	pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
	pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
}
if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
    ((asoc == NULL) && (inp->reconfig_supported == 1))) {
	pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
}
if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
    ((asoc == NULL) && (inp->idata_supported == 1))) {
	pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
}
if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
    ((asoc == NULL) && (inp->nrsack_supported == 1))) {
	pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
}
if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
    ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
	pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
}
if (num_ext > 0) {
	parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
	pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
	pr_supported->ph.param_length = htons(parameter_len);
	padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
	chunk_len += parameter_len;
}

/* add authentication parameters */
if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
    ((asoc == NULL) && (inp->auth_supported == 1))) {
	struct sctp_auth_random *randp;
	struct sctp_auth_hmac_algo *hmacs;
	struct sctp_auth_chunk_list *chunks;

	if (padding_len > 0) {
		memset(mtod(m, caddr_t) + chunk_len, 0, padding_len);
		chunk_len += padding_len;
		padding_len = 0;
	}
	/* generate and add RANDOM parameter */
	randp = (struct sctp_auth_random *)(mtod(m, caddr_t) + chunk_len);
	parameter_len = (uint16_t)sizeof(struct sctp_auth_random) +
	                SCTP_AUTH_RANDOM_SIZE_DEFAULT;
	randp->ph.param_type = htons(SCTP_RANDOM);
	randp->ph.param_length = htons(parameter_len);
	SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
	padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
	chunk_len += parameter_len;

	if (padding_len > 0) {
		memset(mtod(m, caddr_t) + chunk_len, 0, padding_len);
		chunk_len += padding_len;
		padding_len = 0;
	}
	/* add HMAC_ALGO parameter */
	hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t) + chunk_len);
	parameter_len = (uint16_t)sizeof(struct sctp_auth_hmac_algo) +
	                sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
	                                        (uint8_t *)hmacs->hmac_ids);
	hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
	hmacs->ph.param_length = htons(parameter_len);
	padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
	chunk_len += parameter_len;

	if (padding_len > 0) {
		memset(mtod(m, caddr_t) + chunk_len, 0, padding_len);
		chunk_len += padding_len;
		padding_len = 0;
	}
	/* add CHUNKS parameter */
	chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t) + chunk_len);
	parameter_len = (uint16_t)sizeof(struct sctp_auth_chunk_list) +
	                sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
	                                           chunks->chunk_types);
	chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
	chunks->ph.param_length = htons(parameter_len);
	padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
	chunk_len += parameter_len;
}
SCTP_BUF_LEN(m) = chunk_len;
m_last = m;
/* now the addresses */
/* To optimize this we could put the scoping stuff
 * into a structure and remove the individual uint8's from
 * the stc structure. Then we could just sifa in the
 * address within the stc.. but for now this is a quick
 * hack to get the address stuff teased apart.
 */
scp.ipv4_addr_legal = stc.ipv4_addr_legal;
scp.ipv6_addr_legal = stc.ipv6_addr_legal;
#if defined(__Userspace__)
scp.conn_addr_legal = stc.conn_addr_legal;
#endif
scp.loopback_scope = stc.loopback_scope;
scp.ipv4_local_scope = stc.ipv4_scope;
scp.local_scope = stc.local_scope;
scp.site_scope = stc.site_scope;
m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
                                    cnt_inits_to,
                                    &padding_len, &chunk_len);
/* padding_len can only be positive, if no addresses have been added */
if (padding_len > 0) {
	memset(mtod(m, caddr_t) + chunk_len, 0, padding_len);
	chunk_len += padding_len;
	SCTP_BUF_LEN(m) += padding_len;
	padding_len = 0;
}

/* tack on the operational error if present */
if (op_err) {
	parameter_len = 0;
	for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
		parameter_len += SCTP_BUF_LEN(m_tmp);
	}
	padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
	SCTP_BUF_NEXT(m_last) = op_err;
	while (SCTP_BUF_NEXT(m_last) != NULL) {
		m_last = SCTP_BUF_NEXT(m_last);
	}
	chunk_len += parameter_len;
}
if (padding_len > 0) {
	m_last = sctp_add_pad_tombuf(m_last, padding_len);
	if (m_last == NULL) {
		/* Houston we have a problem, no space */
		sctp_m_freem(m);
		return;
	}
	chunk_len += padding_len;
	padding_len = 0;
}
/* Now we must build a cookie */
m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
if (m_cookie == NULL) {
	/* memory problem */
	sctp_m_freem(m);
	return;
}
/* Now append the cookie to the end and update the space/size */
SCTP_BUF_NEXT(m_last) = m_cookie;
parameter_len = 0;
for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
	parameter_len += SCTP_BUF_LEN(m_tmp);
	if (SCTP_BUF_NEXT(m_tmp) == NULL) {
		m_last = m_tmp;
	}
}
padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
chunk_len += parameter_len;

/* Place in the size, but we don't include
 * the last pad (if any) in the INIT-ACK.
 */
initack->ch.chunk_length = htons(chunk_len);

/* Time to sign the cookie, we don't sign over the cookie
 * signature though thus we set trailer.
 */
(void)sctp_hmac_m(SCTP_HMAC,
		  (uint8_t *)inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
		  SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
		  (uint8_t *)signature, SCTP_SIGNATURE_SIZE);
#if defined(__Userspace__)
/*
 * Don't put AF_CONN addresses on the wire, in case this is critical
 * for the application. However, they are protected by the HMAC and
 * need to be reconstructed before checking the HMAC.
 * Clearing is only done in the mbuf chain, since the local stc is
 * not used anymore.
 */
if (stc.addr_type == SCTP_CONN_ADDRESS) {
	const void *p = NULL;

	m_copyback(m_cookie, sizeof(struct sctp_paramhdr) + offsetof(struct sctp_state_cookie, address),
	           (int)sizeof(void *), (caddr_t)&p);
}
if (stc.laddr_type == SCTP_CONN_ADDRESS) {
	const void *p = NULL;

	m_copyback(m_cookie, sizeof(struct sctp_paramhdr) + offsetof(struct sctp_state_cookie, laddress),
	           (int)sizeof(void *), (caddr_t)&p);
}
#endif
/*
 * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
 * here since the timer will drive a retranmission.
 */
if (padding_len > 0) {
	if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
		sctp_m_freem(m);
		return;
	}
}
if (stc.loopback_scope) {
	over_addr = (union sctp_sockstore *)dst;
} else {
	over_addr = NULL;
}

if (asoc != NULL) {
	use_zero_crc = (asoc->rcv_edmid != SCTP_EDMID_NONE) && (asoc->rcv_edmid == edmid);
} else {
	use_zero_crc = (inp->rcv_edmid != SCTP_EDMID_NONE) && (inp->rcv_edmid == edmid);
}

if ((error = sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
                                        0, 0,
                                        inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
                                        port, over_addr,
#if defined(__FreeBSD__) && !defined(__Userspace__)
                                        mflowtype, mflowid,
#endif
                                        use_zero_crc,
                                        SCTP_SO_NOT_LOCKED))) {
	SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
	if (error == ENOBUFS) {
		if (asoc != NULL) {
			asoc->ifp_had_enobuf = 1;
		}
		SCTP_STAT_INCR(sctps_lowlevelerr);
	}
} else {
	if (asoc != NULL) {
		asoc->ifp_had_enobuf = 0;
	}
}
SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
}

static void
sctp_prune_prsctp(struct sctp_tcb *stcb,
   struct sctp_association *asoc,
   struct sctp_nonpad_sndrcvinfo *srcv,
   int dataout)
{
int freed_spc = 0;
struct sctp_tmit_chunk *chk, *nchk;

SCTP_TCB_LOCK_ASSERT(stcb);
if ((asoc->prsctp_supported) &&
    (asoc->sent_queue_cnt_removeable > 0)) {
	TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
		/*
		 * Look for chunks marked with the PR_SCTP flag AND
		 * the buffer space flag. If the one being sent is
		 * equal or greater priority then purge the old one
		 * and free some space.
		 */
		if (PR_SCTP_BUF_ENABLED(chk->flags)) {
			/*
			 * This one is PR-SCTP AND buffer space
			 * limited type
			 */
			if (chk->rec.data.timetodrop.tv_sec > (long)srcv->sinfo_timetolive) {
				/*
				 * Lower numbers equates to higher
				 * priority. So if the one we are
				 * looking at has a larger priority,
				 * we want to drop the data and NOT
				 * retransmit it.
				 */
				if (chk->data) {
					/*
					 * We release the book_size
					 * if the mbuf is here
					 */
					int ret_spc;
					uint8_t sent;

					if (chk->sent > SCTP_DATAGRAM_UNSENT)
						sent = 1;
					else
						sent = 0;
					ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
					    sent,
					    SCTP_SO_LOCKED);
					freed_spc += ret_spc;
					if (freed_spc >= dataout) {
						return;
					}
				}	/* if chunk was present */
			}	/* if of sufficient priority */
		}	/* if chunk has enabled */
	}		/* tailqforeach */

	TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
		/* Here we must move to the sent queue and mark */
		if (PR_SCTP_BUF_ENABLED(chk->flags)) {
			if (chk->rec.data.timetodrop.tv_sec > (long)srcv->sinfo_timetolive) {
				if (chk->data) {
					/*
					 * We release the book_size
					 * if the mbuf is here
					 */
					int ret_spc;

					ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
					    0, SCTP_SO_LOCKED);

					freed_spc += ret_spc;
					if (freed_spc >= dataout) {
						return;
					}
				}	/* end if chk->data */
			}	/* end if right class */
		}	/* end if chk pr-sctp */
	}		/* tailqforeachsafe (chk) */
}			/* if enabled in asoc */
}

uint32_t
sctp_get_frag_point(struct sctp_tcb *stcb)
{
struct sctp_association *asoc;
uint32_t frag_point, overhead;

asoc = &stcb->asoc;
/* Consider IP header and SCTP common header. */
if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
	overhead = SCTP_MIN_OVERHEAD;
} else {
#if defined(__Userspace__)
	if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_CONN) {
		overhead = sizeof(struct sctphdr);
	} else {
		overhead = SCTP_MIN_V4_OVERHEAD;
	}
#else
	overhead = SCTP_MIN_V4_OVERHEAD;
#endif
}
/* Consider DATA/IDATA chunk header and AUTH header, if needed. */
if (asoc->idata_supported) {
	overhead += sizeof(struct sctp_idata_chunk);
	if (sctp_auth_is_required_chunk(SCTP_IDATA, asoc->peer_auth_chunks)) {
		overhead += sctp_get_auth_chunk_len(asoc->peer_hmac_id);
	}
} else {
	overhead += sizeof(struct sctp_data_chunk);
	if (sctp_auth_is_required_chunk(SCTP_DATA, asoc->peer_auth_chunks)) {
		overhead += sctp_get_auth_chunk_len(asoc->peer_hmac_id);
	}
}
KASSERT(overhead % 4 == 0,
        ("overhead (%u) not a multiple of 4", overhead));
/* Consider padding. */
if (asoc->smallest_mtu % 4 > 0) {
	overhead += (asoc->smallest_mtu % 4);
}
KASSERT(asoc->smallest_mtu > overhead,
        ("Association MTU (%u) too small for overhead (%u)",
         asoc->smallest_mtu, overhead));
frag_point = asoc->smallest_mtu - overhead;
KASSERT(frag_point % 4 == 0,
        ("frag_point (%u) not a multiple of 4", frag_point));
/* Honor MAXSEG socket option. */
if ((asoc->sctp_frag_point > 0) &&
    (asoc->sctp_frag_point < frag_point)) {
	frag_point = asoc->sctp_frag_point;
}
return (frag_point);
}

static void
sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
{
/*
 * We assume that the user wants PR_SCTP_TTL if the user
 * provides a positive lifetime but does not specify any
 * PR_SCTP policy.
 */
if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
	sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
} else if (sp->timetolive > 0) {
	sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
	sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
} else {
	return;
}
switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
case CHUNK_FLAGS_PR_SCTP_BUF:
	/*
	 * Time to live is a priority stored in tv_sec when
	 * doing the buffer drop thing.
	 */
	sp->ts.tv_sec = sp->timetolive;
	sp->ts.tv_usec = 0;
	break;
case CHUNK_FLAGS_PR_SCTP_TTL:
{
	struct timeval tv;
	(void)SCTP_GETTIME_TIMEVAL(&sp->ts);
	tv.tv_sec = sp->timetolive / 1000;
	tv.tv_usec = (sp->timetolive * 1000) % 1000000;
	/* TODO sctp_constants.h needs alternative time macros when
	 *  _KERNEL is undefined.
	 */
#if !(defined(__FreeBSD__) && !defined(__Userspace__))
	timeradd(&sp->ts, &tv, &sp->ts);
#else
	timevaladd(&sp->ts, &tv);
#endif
}
	break;
case CHUNK_FLAGS_PR_SCTP_RTX:
	/*
	 * Time to live is a the number or retransmissions
	 * stored in tv_sec.
	 */
	sp->ts.tv_sec = sp->timetolive;
	sp->ts.tv_usec = 0;
	break;
default:
	SCTPDBG(SCTP_DEBUG_USRREQ1,
		"Unknown PR_SCTP policy %u.\n",
		PR_SCTP_POLICY(sp->sinfo_flags));
	break;
}
}

static int
sctp_msg_append(struct sctp_tcb *stcb,
	struct sctp_nets *net,
	struct mbuf *m,
	struct sctp_nonpad_sndrcvinfo *srcv)
{
int error = 0;
struct mbuf *at;
struct sctp_stream_queue_pending *sp = NULL;
struct sctp_stream_out *strm;

SCTP_TCB_LOCK_ASSERT(stcb);

/* Given an mbuf chain, put it
 * into the association send queue and
 * place it on the wheel
 */
if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
	/* Invalid stream number */
	SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
	error = EINVAL;
	goto out_now;
}
if ((stcb->asoc.stream_locked) &&
    (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
	SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
	error = EINVAL;
	goto out_now;
}
if ((stcb->asoc.strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
    (stcb->asoc.strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
	/*
	 * Can't queue any data while stream reset is underway.
	 */
	if (stcb->asoc.strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
		error = EAGAIN;
	} else {
		error = EINVAL;
	}
	goto out_now;
}
/* Now can we send this? */
if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
    (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
    (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
    (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
	/* got data while shutting down */
	SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EPIPE);
	error = EPIPE;
	goto out_now;
}
sctp_alloc_a_strmoq(stcb, sp);
if (sp == NULL) {
	SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
	error = ENOMEM;
	goto out_now;
}
sp->sinfo_flags = srcv->sinfo_flags;
sp->timetolive = srcv->sinfo_timetolive;
sp->ppid = srcv->sinfo_ppid;
sp->context = srcv->sinfo_context;
sp->fsn = 0;
if (sp->sinfo_flags & SCTP_ADDR_OVER) {
	sp->net = net;
	atomic_add_int(&sp->net->ref_count, 1);
} else {
	sp->net = NULL;
}
(void)SCTP_GETTIME_TIMEVAL(&sp->ts);
sp->sid = srcv->sinfo_stream;
sp->msg_is_complete = 1;
sp->sender_all_done = 1;
sp->some_taken = 0;
sp->data = m;
sp->tail_mbuf = NULL;
sctp_set_prsctp_policy(sp);
/* We could in theory (for sendall) sifa the length
 * in, but we would still have to hunt through the
 * chain since we need to setup the tail_mbuf
 */
sp->length = 0;
for (at = m; at; at = SCTP_BUF_NEXT(at)) {
	if (SCTP_BUF_NEXT(at) == NULL)
		sp->tail_mbuf = at;
	sp->length += SCTP_BUF_LEN(at);
}
if (srcv->sinfo_keynumber_valid) {
	sp->auth_keyid = srcv->sinfo_keynumber;
} else {
	sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
}
if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
	sctp_auth_key_acquire(stcb, sp->auth_keyid);
	sp->holds_key_ref = 1;
}
strm = &stcb->asoc.strmout[srcv->sinfo_stream];
sctp_snd_sb_alloc(stcb, sp->length);
atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp);
m = NULL;
out_now:
if (m) {
	sctp_m_freem(m);
}
return (error);
}

static struct mbuf *
sctp_copy_mbufchain(struct mbuf *clonechain,
	    struct mbuf *outchain,
	    struct mbuf **endofchain,
	    int can_take_mbuf,
	    int sizeofcpy,
	    uint8_t copy_by_ref)
{
struct mbuf *m;
struct mbuf *appendchain;
caddr_t cp;
int len;

if (endofchain == NULL) {
	/* error */
error_out:
	if (outchain)
		sctp_m_freem(outchain);
	return (NULL);
}
if (can_take_mbuf) {
	appendchain = clonechain;
} else {
	if (!copy_by_ref &&
	    (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))) {
		/* Its not in a cluster */
		if (*endofchain == NULL) {
			/* lets get a mbuf cluster */
			if (outchain == NULL) {
				/* This is the general case */
			new_mbuf:
				outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
				if (outchain == NULL) {
					goto error_out;
				}
				SCTP_BUF_LEN(outchain) = 0;
				*endofchain = outchain;
				/* get the prepend space */
				SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV+4));
			} else {
				/* We really should not get a NULL in endofchain */
				/* find end */
				m = outchain;
				while (m) {
					if (SCTP_BUF_NEXT(m) == NULL) {
						*endofchain = m;
						break;
					}
					m = SCTP_BUF_NEXT(m);
				}
				/* sanity */
				if (*endofchain == NULL) {
					/* huh, TSNH XXX maybe we should panic */
					sctp_m_freem(outchain);
					goto new_mbuf;
				}
			}
			/* get the new end of length */
			len = (int)M_TRAILINGSPACE(*endofchain);
		} else {
			/* how much is left at the end? */
			len = (int)M_TRAILINGSPACE(*endofchain);
		}
		/* Find the end of the data, for appending */
		cp = (mtod((*endofchain), caddr_t) + SCTP_BUF_LEN((*endofchain)));

		/* Now lets copy it out */
		if (len >= sizeofcpy) {
			/* It all fits, copy it in */
			m_copydata(clonechain, 0, sizeofcpy, cp);
			SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
		} else {
			/* fill up the end of the chain */
			if (len > 0) {
				m_copydata(clonechain, 0, len, cp);
				SCTP_BUF_LEN((*endofchain)) += len;
				/* now we need another one */
				sizeofcpy -= len;
			}
			m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
			if (m == NULL) {
				/* We failed */
				goto error_out;
			}
			SCTP_BUF_NEXT((*endofchain)) = m;
			*endofchain = m;
			cp = mtod((*endofchain), caddr_t);
			m_copydata(clonechain, len, sizeofcpy, cp);
			SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
		}
		return (outchain);
	} else {
		/* copy the old fashion way */
		appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
#ifdef SCTP_MBUF_LOGGING
		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
			sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
		}
#endif
	}
}
if (appendchain == NULL) {
	/* error */
	if (outchain)
		sctp_m_freem(outchain);
	return (NULL);
}
if (outchain) {
	/* tack on to the end */
	if (*endofchain != NULL) {
		SCTP_BUF_NEXT(((*endofchain))) = appendchain;
	} else {
		m = outchain;
		while (m) {
			if (SCTP_BUF_NEXT(m) == NULL) {
				SCTP_BUF_NEXT(m) = appendchain;
				break;
			}
			m = SCTP_BUF_NEXT(m);
		}
	}
	/*
	 * save off the end and update the end-chain
	 * position
	 */
	m = appendchain;
	while (m) {
		if (SCTP_BUF_NEXT(m) == NULL) {
			*endofchain = m;
			break;
		}
		m = SCTP_BUF_NEXT(m);
	}
	return (outchain);
} else {
	/* save off the end and update the end-chain position */
	m = appendchain;
	while (m) {
		if (SCTP_BUF_NEXT(m) == NULL) {
			*endofchain = m;
			break;
		}
		m = SCTP_BUF_NEXT(m);
	}
	return (appendchain);
}
}

static int
sctp_med_chunk_output(struct sctp_inpcb *inp,
	      struct sctp_tcb *stcb,
	      struct sctp_association *asoc,
	      int *num_out,
	      int *reason_code,
	      int control_only, int from_where,
	      struct timeval *now, int *now_filled,
	      uint32_t frag_point, int so_locked);

static void
sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
   uint32_t val SCTP_UNUSED)
{
struct sctp_copy_all *ca;
struct mbuf *m;
int ret = 0;
int added_control = 0;
int un_sent, do_chunk_output = 1;
struct sctp_association *asoc;
struct sctp_nets *net;

ca = (struct sctp_copy_all *)ptr;
if (ca->m == NULL) {
	return;
}
if (ca->inp != inp) {
	/* TSNH */
	return;
}
if (ca->sndlen > 0) {
	m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
	if (m == NULL) {
		/* can't copy so we are done */
		ca->cnt_failed++;
		return;
	}
#ifdef SCTP_MBUF_LOGGING
	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
		sctp_log_mbc(m, SCTP_MBUF_ICOPY);
	}
#endif
} else {
	m = NULL;
}
SCTP_TCB_LOCK_ASSERT(stcb);
if (stcb->asoc.alternate) {
	net = stcb->asoc.alternate;
} else {
	net = stcb->asoc.primary_destination;
}
if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
	/* Abort this assoc with m as the user defined reason */
	if (m != NULL) {
		SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
	} else {
		m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
		                          0, M_NOWAIT, 1, MT_DATA);
		if (m != NULL) {
			SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
		}
	}
	if (m != NULL) {
		struct sctp_paramhdr *ph;

		ph = mtod(m, struct sctp_paramhdr *);
		ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
		ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + ca->sndlen));
	}
	/* We add one here to keep the assoc from
	 * dis-appearing on us.
	 */
	atomic_add_int(&stcb->asoc.refcnt, 1);
	sctp_abort_an_association(inp, stcb, m, false, SCTP_SO_NOT_LOCKED);
	/* sctp_abort_an_association calls sctp_free_asoc()
	 * free association will NOT free it since we
	 * incremented the refcnt .. we do this to prevent
	 * it being freed and things getting tricky since
	 * we could end up (from free_asoc) calling inpcb_free
	 * which would get a recursive lock call to the
	 * iterator lock.. But as a consequence of that the
	 * stcb will return to us un-locked.. since free_asoc
	 * returns with either no TCB or the TCB unlocked, we
	 * must relock.. to unlock in the iterator timer :-0
	 */
	SCTP_TCB_LOCK(stcb);
	atomic_subtract_int(&stcb->asoc.refcnt, 1);
	goto no_chunk_output;
} else {
	if (m != NULL) {
		ret = sctp_msg_append(stcb, net, m, &ca->sndrcv);
	}
	asoc = &stcb->asoc;
	if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
		/* shutdown this assoc */
		if (TAILQ_EMPTY(&asoc->send_queue) &&
		    TAILQ_EMPTY(&asoc->sent_queue) &&
		    sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED) == 0) {
			if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete)(stcb, asoc)) {
				goto abort_anyway;
			}
			/* there is nothing queued to send, so I'm done... */
			if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
			    (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
			    (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
				/* only send SHUTDOWN the first time through */
				if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
					SCTP_STAT_DECR_GAUGE32(sctps_currestab);
				}
				SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
				sctp_stop_timers_for_shutdown(stcb);
				sctp_send_shutdown(stcb, net);
				sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
				                 net);
				sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
				                 NULL);
				added_control = 1;
				do_chunk_output = 0;
			}
		} else {
			/*
			 * we still got (or just got) data to send, so set
			 * SHUTDOWN_PENDING
			 */
			/*
			 * XXX sockets draft says that SCTP_EOF should be
			 * sent with no data.  currently, we will allow user
			 * data to be sent first and move to
			 * SHUTDOWN-PENDING
			 */
			if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
			    (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
			    (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
				if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete)(stcb, asoc)) {
					SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
				}
				SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
				if (TAILQ_EMPTY(&asoc->send_queue) &&
				    TAILQ_EMPTY(&asoc->sent_queue) &&
				    (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
					struct mbuf *op_err;
					char msg[SCTP_DIAG_INFO_LEN];

				abort_anyway:
					SCTP_SNPRINTF(msg, sizeof(msg),
					              "%s:%d at %s", __FILE__, __LINE__, __func__);
					op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
					                             msg);
					atomic_add_int(&stcb->asoc.refcnt, 1);
					sctp_abort_an_association(stcb->sctp_ep, stcb,
					                          op_err, false, SCTP_SO_NOT_LOCKED);
					atomic_subtract_int(&stcb->asoc.refcnt, 1);
					goto no_chunk_output;
				}
			}
		}
	}
}
un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
	   (stcb->asoc.stream_queue_cnt * SCTP_DATA_CHUNK_OVERHEAD(stcb)));

if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
    (stcb->asoc.total_flight > 0) &&
    (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
	do_chunk_output = 0;
}
if (do_chunk_output)
	sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
else if (added_control) {
	struct timeval now;
	int num_out, reason, now_filled = 0;

	(void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
	                            &reason, 1, 1, &now, &now_filled,
	                            sctp_get_frag_point(stcb),
	                            SCTP_SO_NOT_LOCKED);
}
no_chunk_output:
if (ret) {
	ca->cnt_failed++;
} else {
	ca->cnt_sent++;
}
}

static void
sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
{
struct sctp_copy_all *ca;

ca = (struct sctp_copy_all *)ptr;
/*
 * Do a notify here? Kacheong suggests that the notify be done at
 * the send time.. so you would push up a notification if any send
 * failed. Don't know if this is feasible since the only failures we
 * have is "memory" related and if you cannot get an mbuf to send
 * the data you surely can't get an mbuf to send up to notify the
 * user you can't send the data :->
 */

/* now free everything */
if (ca->inp) {
	/* Lets clear the flag to allow others to run. */
	SCTP_INP_WLOCK(ca->inp);
	ca->inp->sctp_flags &= ~SCTP_PCB_FLAGS_SND_ITERATOR_UP;
	SCTP_INP_WUNLOCK(ca->inp);
}
sctp_m_freem(ca->m);
SCTP_FREE(ca, SCTP_M_COPYAL);
}

static struct mbuf *
sctp_copy_out_all(struct uio *uio, ssize_t len)
{
struct mbuf *ret, *at;
ssize_t left, willcpy, cancpy, error;

ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
if (ret == NULL) {
	/* TSNH */
	return (NULL);
}
left = len;
SCTP_BUF_LEN(ret) = 0;
/* save space for the data chunk header */
cancpy = (int)M_TRAILINGSPACE(ret);
willcpy = min(cancpy, left);
at = ret;
while (left > 0) {
	/* Align data to the end */
	error = uiomove(mtod(at, caddr_t), (int)willcpy, uio);
	if (error) {
err_out_now:
		sctp_m_freem(at);
		return (NULL);
	}
	SCTP_BUF_LEN(at) = (int)willcpy;
	SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
	left -= willcpy;
	if (left > 0) {
		SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg((unsigned int)left, 0, M_WAITOK, 1, MT_DATA);
		if (SCTP_BUF_NEXT(at) == NULL) {
			goto err_out_now;
		}
		at = SCTP_BUF_NEXT(at);
		SCTP_BUF_LEN(at) = 0;
		cancpy = (int)M_TRAILINGSPACE(at);
		willcpy = min(cancpy, left);
	}
}
return (ret);
}

static int
sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
   struct sctp_nonpad_sndrcvinfo *srcv)
{
struct sctp_copy_all *ca;
struct mbuf *mat;
ssize_t sndlen;
int ret;

if (uio != NULL) {
#if defined(__APPLE__) && !defined(__Userspace__)
#if defined(APPLE_LEOPARD)
	sndlen = uio->uio_resid;
#else
	sndlen = uio_resid(uio);
#endif
#else
	sndlen = uio->uio_resid;
#endif
} else {
	sndlen = 0;
	for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
		sndlen += SCTP_BUF_LEN(mat);
	}
}
if (sndlen > (ssize_t)SCTP_BASE_SYSCTL(sctp_sendall_limit)) {
	/* You must not be larger than the limit! */
	return (EMSGSIZE);
}
SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
	    SCTP_M_COPYAL);
if (ca == NULL) {
	sctp_m_freem(m);
	SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
	return (ENOMEM);
}
memset(ca, 0, sizeof(struct sctp_copy_all));
ca->inp = inp;
if (srcv != NULL) {
	memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
}
/* Serialize. */
SCTP_INP_WLOCK(inp);
if ((inp->sctp_flags & SCTP_PCB_FLAGS_SND_ITERATOR_UP) != 0) {
	SCTP_INP_WUNLOCK(inp);
	sctp_m_freem(m);
	SCTP_FREE(ca, SCTP_M_COPYAL);
	return (EBUSY);
}
inp->sctp_flags |= SCTP_PCB_FLAGS_SND_ITERATOR_UP;
SCTP_INP_WUNLOCK(inp);
/*
 * take off the sendall flag, it would be bad if we failed to do
 * this :-0
 */
ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
/* get length and mbuf chain */
ca->sndlen = sndlen;
if (uio != NULL) {
#if defined(__APPLE__) && !defined(__Userspace__)
	SCTP_SOCKET_UNLOCK(SCTP_INP_SO(inp), 0);
#endif
	ca->m = sctp_copy_out_all(uio, ca->sndlen);
#if defined(__APPLE__) && !defined(__Userspace__)
	SCTP_SOCKET_LOCK(SCTP_INP_SO(inp), 0);
#endif
	if (ca->m == NULL) {
		SCTP_FREE(ca, SCTP_M_COPYAL);
		sctp_m_freem(m);
		SCTP_INP_WLOCK(inp);
		inp->sctp_flags &= ~SCTP_PCB_FLAGS_SND_ITERATOR_UP;
		SCTP_INP_WUNLOCK(inp);
		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
		return (ENOMEM);
	}
} else {
	ca->m = m;
}
ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
                             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
                             SCTP_ASOC_ANY_STATE,
                             (void *)ca, 0,
                             sctp_sendall_completes, inp, 1);
if (ret != 0) {
	SCTP_INP_WLOCK(inp);
	inp->sctp_flags &= ~SCTP_PCB_FLAGS_SND_ITERATOR_UP;
	SCTP_INP_WUNLOCK(inp);
	SCTP_FREE(ca, SCTP_M_COPYAL);
	SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
	return (EFAULT);
}
return (0);
}

void
sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
{
struct sctp_tmit_chunk *chk, *nchk;

TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
	if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
		TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
		asoc->ctrl_queue_cnt--;
		if (chk->data) {
			sctp_m_freem(chk->data);
			chk->data = NULL;
		}
		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
	}
}
}

void
sctp_toss_old_asconf(struct sctp_tcb *stcb)
{
struct sctp_association *asoc;
struct sctp_tmit_chunk *chk, *nchk;
struct sctp_asconf_chunk *acp;

asoc = &stcb->asoc;
TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
	/* find SCTP_ASCONF chunk in queue */
	if (chk->rec.chunk_id.id == SCTP_ASCONF) {
		if (chk->data) {
			acp = mtod(chk->data, struct sctp_asconf_chunk *);
			if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
				/* Not Acked yet */
				break;
			}
		}
		TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
		asoc->ctrl_queue_cnt--;
		if (chk->data) {
			sctp_m_freem(chk->data);
			chk->data = NULL;
		}
		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
	}
}
}

static void
sctp_clean_up_datalist(struct sctp_tcb *stcb,
   struct sctp_association *asoc,
   struct sctp_tmit_chunk **data_list,
   int bundle_at,
   struct sctp_nets *net)
{
int i;
struct sctp_tmit_chunk *tp1;

for (i = 0; i < bundle_at; i++) {
	/* off of the send queue */
	TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
	asoc->send_queue_cnt--;
	if (i > 0) {
		/*
		 * Any chunk NOT 0 you zap the time chunk 0 gets
		 * zapped or set based on if a RTO measurement is
		 * needed.
		 */
		data_list[i]->do_rtt = 0;
	}
	/* record time */
	data_list[i]->sent_rcv_time = net->last_sent_time;
	data_list[i]->rec.data.cwnd_at_send = net->cwnd;
	data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.tsn;
	if (data_list[i]->whoTo == NULL) {
		data_list[i]->whoTo = net;
		atomic_add_int(&net->ref_count, 1);
	}
	/* on to the sent queue */
	tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
	if ((tp1) && SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
		struct sctp_tmit_chunk *tpp;

		/* need to move back */
	back_up_more:
		tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
		if (tpp == NULL) {
			TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
			goto all_done;
		}
		tp1 = tpp;
		if (SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
			goto back_up_more;
		}
		TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
	} else {
		TAILQ_INSERT_TAIL(&asoc->sent_queue,
				  data_list[i],
				  sctp_next);
	}
all_done:
	/* This does not lower until the cum-ack passes it */
	asoc->sent_queue_cnt++;
	if ((asoc->peers_rwnd <= 0) &&
	    (asoc->total_flight == 0) &&
	    (bundle_at == 1)) {
		/* Mark the chunk as being a window probe */
		SCTP_STAT_INCR(sctps_windowprobed);
	}
#ifdef SCTP_AUDITING_ENABLED
	sctp_audit_log(0xC2, 3);
#endif
	data_list[i]->sent = SCTP_DATAGRAM_SENT;
	data_list[i]->snd_count = 1;
	data_list[i]->rec.data.chunk_was_revoked = 0;
	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
		sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
			       data_list[i]->whoTo->flight_size,
			       data_list[i]->book_size,
			       (uint32_t)(uintptr_t)data_list[i]->whoTo,
			       data_list[i]->rec.data.tsn);
	}
	sctp_flight_size_increase(data_list[i]);
	sctp_total_flight_increase(stcb, data_list[i]);
	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
		sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
		      asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
	}
	asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
					    (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
	if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
		/* SWS sender side engages */
		asoc->peers_rwnd = 0;
	}
}
if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
	(*asoc->cc_functions.sctp_cwnd_update_packet_transmitted)(stcb, net);
}
}

static void
sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked)
{
struct sctp_tmit_chunk *chk, *nchk;

TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
	if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
	    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||	/* EY */
	    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
	    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
	    (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
	    (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
	    (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
	    (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
	    (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
	    (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
	    (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
	    (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
		/* Stray chunks must be cleaned up */
clean_up_anyway:
		TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
		asoc->ctrl_queue_cnt--;
		if (chk->data) {
			sctp_m_freem(chk->data);
			chk->data = NULL;
		}
		if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
			asoc->fwd_tsn_cnt--;
		}
		sctp_free_a_chunk(stcb, chk, so_locked);
	} else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
		/* special handling, we must look into the param */
		if (chk != asoc->str_reset) {
			goto clean_up_anyway;
		}
	}
}
}

static uint32_t
sctp_can_we_split_this(struct sctp_tcb *stcb, uint32_t length,
                      uint32_t space_left, uint32_t frag_point, int eeor_on)
{
/* Make a decision on if I should split a
 * msg into multiple parts. This is only asked of
 * incomplete messages.
 */
if (eeor_on) {
	/* If we are doing EEOR we need to always send
	 * it if its the entire thing, since it might
	 * be all the guy is putting in the hopper.
	 */
	if (space_left >= length) {
		/*-
		 * If we have data outstanding,
		 * we get another chance when the sack
		 * arrives to transmit - wait for more data
		 */
		if (stcb->asoc.total_flight == 0) {
			/* If nothing is in flight, we zero
			 * the packet counter.
			 */
			return (length);
		}
		return (0);

	} else {
		/* You can fill the rest */
		return (space_left);
	}
}
/*-
 * For those strange folk that make the send buffer
 * smaller than our fragmentation point, we can't
 * get a full msg in so we have to allow splitting.
 */
if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
	return (length);
}
if ((length <= space_left) ||
    ((length - space_left) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
	/* Sub-optimal residual don't split in non-eeor mode. */
	return (0);
}
/* If we reach here length is larger
 * than the space_left. Do we wish to split
 * it for the sake of packet putting together?
 */
if (space_left >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
	/* Its ok to split it */
	return (min(space_left, frag_point));
}
/* Nope, can't split */
return (0);
}

static uint32_t
sctp_move_to_outqueue(struct sctp_tcb *stcb,
                     struct sctp_nets *net,
                     struct sctp_stream_out *strq,
                     uint32_t space_left,
                     uint32_t frag_point,
                     int *giveup,
                     int eeor_mode,
                     int *bail,
                     int so_locked)
{
/* Move from the stream to the send_queue keeping track of the total */
struct sctp_association *asoc;
struct sctp_stream_queue_pending *sp;
struct sctp_tmit_chunk *chk;
struct sctp_data_chunk *dchkh=NULL;
struct sctp_idata_chunk *ndchkh=NULL;
uint32_t to_move, length;
int leading;
uint8_t rcv_flags = 0;
uint8_t some_taken;

SCTP_TCB_LOCK_ASSERT(stcb);
asoc = &stcb->asoc;
one_more_time:
/*sa_ignore FREED_MEMORY*/
sp = TAILQ_FIRST(&strq->outqueue);
if (sp == NULL) {
	sp = TAILQ_FIRST(&strq->outqueue);
	if (sp) {
		goto one_more_time;
	}
	if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_EXPLICIT_EOR) == 0) &&
	    (stcb->asoc.idata_supported == 0) &&
	    (strq->last_msg_incomplete)) {
		SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
		            strq->sid,
		            strq->last_msg_incomplete);
		strq->last_msg_incomplete = 0;
	}
	to_move = 0;
	goto out_of;
}
if ((sp->msg_is_complete) && (sp->length == 0)) {
	if (sp->sender_all_done) {
		/* We are doing deferred cleanup. Last
		 * time through when we took all the data
		 * the sender_all_done was not set.
		 */
		if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
			SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
			SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
			            sp->sender_all_done,
			            sp->length,
			            sp->msg_is_complete,
			            sp->put_last_out);
		}
		atomic_subtract_int(&asoc->stream_queue_cnt, 1);
		TAILQ_REMOVE(&strq->outqueue, sp, next);
		stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp);
		if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
		    (strq->chunks_on_queues == 0) &&
		    TAILQ_EMPTY(&strq->outqueue)) {
			stcb->asoc.trigger_reset = 1;
		}
		if (sp->net) {
			sctp_free_remote_addr(sp->net);
			sp->net = NULL;
		}
		if (sp->data) {
			sctp_m_freem(sp->data);
			sp->data = NULL;
		}
		sctp_free_a_strmoq(stcb, sp, so_locked);
		/* back to get the next msg */
		goto one_more_time;
	} else {
		/* sender just finished this but
		 * still holds a reference
		 */
		*giveup = 1;
		to_move = 0;
		goto out_of;
	}
} else {
	/* is there some to get */
	if (sp->length == 0) {
		/* no */
		*giveup = 1;
		to_move = 0;
		goto out_of;
	} else if (sp->discard_rest) {
		/* Whack down the size */
		atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
		if ((stcb->sctp_socket != NULL) &&
		    ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
		     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
			SCTP_SB_DECR(&stcb->sctp_socket->so_snd, sp->length);
		}
		if (sp->data) {
			sctp_m_freem(sp->data);
			sp->data = NULL;
			sp->tail_mbuf = NULL;
		}
		sp->length = 0;
		sp->some_taken = 1;
		*giveup = 1;
		to_move = 0;
		goto out_of;
	}
}
some_taken = sp->some_taken;
length = sp->length;
if (sp->msg_is_complete) {
	/* The message is complete */
	to_move = min(length, frag_point);
	if (to_move == length) {
		/* All of it fits in the MTU */
		if (sp->some_taken) {
			rcv_flags |= SCTP_DATA_LAST_FRAG;
		} else {
			rcv_flags |= SCTP_DATA_NOT_FRAG;
		}
		sp->put_last_out = 1;
		if (sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
			rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
		}
	} else {
		/* Not all of it fits, we fragment */
		if (sp->some_taken == 0) {
			rcv_flags |= SCTP_DATA_FIRST_FRAG;
		}
		sp->some_taken = 1;
	}
} else {
	to_move = sctp_can_we_split_this(stcb, length, space_left, frag_point, eeor_mode);
	if (to_move > 0) {
		if (to_move >= length) {
			to_move = length;
		}
		if (sp->some_taken == 0) {
			rcv_flags |= SCTP_DATA_FIRST_FRAG;
			sp->some_taken = 1;
		}
	} else {
		/* Nothing to take. */
		*giveup = 1;
		to_move = 0;
		goto out_of;
	}
}

/* If we reach here, we can copy out a chunk */
sctp_alloc_a_chunk(stcb, chk);
if (chk == NULL) {
	/* No chunk memory */
	*giveup = 1;
	to_move = 0;
	goto out_of;
}
/* Setup for unordered if needed by looking
 * at the user sent info flags.
 */
if (sp->sinfo_flags & SCTP_UNORDERED) {
	rcv_flags |= SCTP_DATA_UNORDERED;
}
if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
    (sp->sinfo_flags & SCTP_EOF) == SCTP_EOF) {
	rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
}
/* clear out the chunk before setting up */
memset(chk, 0, sizeof(*chk));
chk->rec.data.rcv_flags = rcv_flags;

if (to_move >= length) {
	/* we think we can steal the whole thing */
	if (to_move < sp->length) {
		/* bail, it changed */
		goto dont_do_it;
	}
	chk->data = sp->data;
	chk->last_mbuf = sp->tail_mbuf;
	/* register the stealing */
	sp->data = sp->tail_mbuf = NULL;
} else {
	struct mbuf *m;
dont_do_it:
	chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
	chk->last_mbuf = NULL;
	if (chk->data == NULL) {
		sp->some_taken = some_taken;
		sctp_free_a_chunk(stcb, chk, so_locked);
		*bail = 1;
		to_move = 0;
		goto out_of;
	}
#ifdef SCTP_MBUF_LOGGING
	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
		sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
	}
#endif
	/* Pull off the data */
	m_adj(sp->data, to_move);
	/* Now lets work our way down and compact it */
	m = sp->data;
	while (m && (SCTP_BUF_LEN(m) == 0)) {
		sp->data = SCTP_BUF_NEXT(m);
		SCTP_BUF_NEXT(m) = NULL;
		if (sp->tail_mbuf == m) {
			/*-
			 * Freeing tail? TSNH since
			 * we supposedly were taking less
			 * than the sp->length.
			 */
#ifdef INVARIANTS
			panic("Huh, freeing tail? - TSNH");
#else
			SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
			sp->tail_mbuf = sp->data = NULL;
			sp->length = 0;
#endif
		}
		sctp_m_free(m);
		m = sp->data;
	}
}
if (SCTP_BUF_IS_EXTENDED(chk->data)) {
	chk->copy_by_ref = 1;
} else {
	chk->copy_by_ref = 0;
}
/* get last_mbuf and counts of mb usage
 * This is ugly but hopefully its only one mbuf.
 */
if (chk->last_mbuf == NULL) {
	chk->last_mbuf = chk->data;
	while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
		chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
	}
}

if (to_move > length) {
	/*- This should not happen either
	 * since we always lower to_move to the size
	 * of sp->length if its larger.
	 */
#ifdef INVARIANTS
	panic("Huh, how can to_move be larger?");
#else
	SCTP_PRINTF("Huh, how can to_move be larger?\n");
	sp->length = 0;
#endif
} else {
	atomic_subtract_int(&sp->length, to_move);
}
leading = SCTP_DATA_CHUNK_OVERHEAD(stcb);
if (M_LEADINGSPACE(chk->data) < leading) {
	/* Not enough room for a chunk header, get some */
	struct mbuf *m;

	m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 1, MT_DATA);
	if (m == NULL) {
		/*
		 * we're in trouble here. _PREPEND below will free
		 * all the data if there is no leading space, so we
		 * must put the data back and restore.
		 */
		if (sp->data == NULL) {
			/* unsteal the data */
			sp->data = chk->data;
			sp->tail_mbuf = chk->last_mbuf;
		} else {
			struct mbuf *m_tmp;
			/* reassemble the data */
			m_tmp = sp->data;
			sp->data = chk->data;
			SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
		}
		sp->some_taken = some_taken;
		atomic_add_int(&sp->length, to_move);
		chk->data = NULL;
		*bail = 1;
		sctp_free_a_chunk(stcb, chk, so_locked);
		to_move = 0;
		goto out_of;
	} else {
		SCTP_BUF_LEN(m) = 0;
		SCTP_BUF_NEXT(m) = chk->data;
		chk->data = m;
		M_ALIGN(chk->data, 4);
	}
}
SCTP_BUF_PREPEND(chk->data, SCTP_DATA_CHUNK_OVERHEAD(stcb), M_NOWAIT);
if (chk->data == NULL) {
	/* HELP, TSNH since we assured it would not above? */
#ifdef INVARIANTS
	panic("prepend fails HELP?");
#else
	SCTP_PRINTF("prepend fails HELP?\n");
	sctp_free_a_chunk(stcb, chk, so_locked);
#endif
	*bail = 1;
	to_move = 0;
	goto out_of;
}
sctp_snd_sb_alloc(stcb, SCTP_DATA_CHUNK_OVERHEAD(stcb));
chk->book_size = chk->send_size = (uint16_t)(to_move + SCTP_DATA_CHUNK_OVERHEAD(stcb));
chk->book_size_scale = 0;
chk->sent = SCTP_DATAGRAM_UNSENT;

chk->flags = 0;
chk->asoc = &stcb->asoc;
chk->pad_inplace = 0;
chk->no_fr_allowed = 0;
if (stcb->asoc.idata_supported == 0) {
	if (rcv_flags & SCTP_DATA_UNORDERED) {
		/* Just use 0. The receiver ignores the values. */
		chk->rec.data.mid = 0;
	} else {
		chk->rec.data.mid = strq->next_mid_ordered;
		if (rcv_flags & SCTP_DATA_LAST_FRAG) {
			strq->next_mid_ordered++;
		}
	}
} else {
	if (rcv_flags & SCTP_DATA_UNORDERED) {
		chk->rec.data.mid = strq->next_mid_unordered;
		if (rcv_flags & SCTP_DATA_LAST_FRAG) {
			strq->next_mid_unordered++;
		}
	} else {
		chk->rec.data.mid = strq->next_mid_ordered;
		if (rcv_flags & SCTP_DATA_LAST_FRAG) {
			strq->next_mid_ordered++;
		}
	}
}
chk->rec.data.sid = sp->sid;
chk->rec.data.ppid = sp->ppid;
chk->rec.data.context = sp->context;
chk->rec.data.doing_fast_retransmit = 0;

chk->rec.data.timetodrop = sp->ts;
chk->flags = sp->act_flags;

if (sp->net) {
	chk->whoTo = sp->net;
	atomic_add_int(&chk->whoTo->ref_count, 1);
} else
	chk->whoTo = NULL;

if (sp->holds_key_ref) {
	chk->auth_keyid = sp->auth_keyid;
	sctp_auth_key_acquire(stcb, chk->auth_keyid);
	chk->holds_key_ref = 1;
}
stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, to_move);
#if defined(__FreeBSD__) && !defined(__Userspace__)
chk->rec.data.tsn = atomic_fetchadd_int(&asoc->sending_seq, 1);
#else
chk->rec.data.tsn = asoc->sending_seq++;
#endif
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
	sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
	               (uint32_t)(uintptr_t)stcb, sp->length,
	               (uint32_t)((chk->rec.data.sid << 16) | (0x0000ffff & chk->rec.data.mid)),
	               chk->rec.data.tsn);
}
if (stcb->asoc.idata_supported == 0) {
	dchkh = mtod(chk->data, struct sctp_data_chunk *);
} else {
	ndchkh = mtod(chk->data, struct sctp_idata_chunk *);
}
/*
 * Put the rest of the things in place now. Size was done
 * earlier in previous loop prior to padding.
 */

SCTP_TCB_LOCK_ASSERT(stcb);
#ifdef SCTP_ASOCLOG_OF_TSNS
if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
	asoc->tsn_out_at = 0;
	asoc->tsn_out_wrapped = 1;
}
asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.tsn;
asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.sid;
asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.mid;
asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
asoc->tsn_out_at++;
#endif
if (stcb->asoc.idata_supported == 0) {
	dchkh->ch.chunk_type = SCTP_DATA;
	dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
	dchkh->dp.tsn = htonl(chk->rec.data.tsn);
	dchkh->dp.sid = htons(strq->sid);
	dchkh->dp.ssn = htons((uint16_t)chk->rec.data.mid);
	dchkh->dp.ppid = chk->rec.data.ppid;
	dchkh->ch.chunk_length = htons(chk->send_size);
} else {
	ndchkh->ch.chunk_type = SCTP_IDATA;
	ndchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
	ndchkh->dp.tsn = htonl(chk->rec.data.tsn);
	ndchkh->dp.sid = htons(strq->sid);
	ndchkh->dp.reserved = htons(0);
	ndchkh->dp.mid = htonl(chk->rec.data.mid);
	if (sp->fsn == 0)
		ndchkh->dp.ppid_fsn.ppid = chk->rec.data.ppid;
	else
		ndchkh->dp.ppid_fsn.fsn = htonl(sp->fsn);
	sp->fsn++;
	ndchkh->ch.chunk_length = htons(chk->send_size);
}
/* Now advance the chk->send_size by the actual pad needed. */
if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
	/* need a pad */
	struct mbuf *lm;
	int pads;

	pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
	lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
	if (lm != NULL) {
		chk->last_mbuf = lm;
		chk->pad_inplace = 1;
	}
	chk->send_size += pads;
}
if (PR_SCTP_ENABLED(chk->flags)) {
	asoc->pr_sctp_cnt++;
}
if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
	/* All done pull and kill the message */
	if (sp->put_last_out == 0) {
		SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
		SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
		            sp->sender_all_done,
		            sp->length,
		            sp->msg_is_complete,
		            sp->put_last_out);
	}
	atomic_subtract_int(&asoc->stream_queue_cnt, 1);
	TAILQ_REMOVE(&strq->outqueue, sp, next);
	stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp);
	if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
	    (strq->chunks_on_queues == 0) &&
	    TAILQ_EMPTY(&strq->outqueue)) {
		stcb->asoc.trigger_reset = 1;
	}
	if (sp->net) {
		sctp_free_remote_addr(sp->net);
		sp->net = NULL;
	}
	if (sp->data) {
		sctp_m_freem(sp->data);
		sp->data = NULL;
	}
	sctp_free_a_strmoq(stcb, sp, so_locked);
}
asoc->chunks_on_out_queue++;
strq->chunks_on_queues++;
TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
asoc->send_queue_cnt++;
out_of:
return (to_move);
}

static void
sctp_fill_outqueue(struct sctp_tcb *stcb, struct sctp_nets *net,
                  uint32_t frag_point, int eeor_mode, int *quit_now,
                  int so_locked)
{
struct sctp_association *asoc;
struct sctp_stream_out *strq;
uint32_t space_left, moved, total_moved;
int bail, giveup;

SCTP_TCB_LOCK_ASSERT(stcb);
asoc = &stcb->asoc;
total_moved = 0;
switch (net->ro._l_addr.sa.sa_family) {
#ifdef INET
	case AF_INET:
		space_left = net->mtu - SCTP_MIN_V4_OVERHEAD;
		break;
#endif
#ifdef INET6
	case AF_INET6:
		space_left = net->mtu - SCTP_MIN_OVERHEAD;
		break;
#endif
#if defined(__Userspace__)
	case AF_CONN:
		space_left = net->mtu - sizeof(struct sctphdr);
		break;
#endif
	default:
		/* TSNH */
		space_left = net->mtu;
		break;
}
/* Need an allowance for the data chunk header too */
space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);

/* must make even word boundary */
space_left &= 0xfffffffc;
strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
giveup = 0;
bail = 0;
while ((space_left > 0) && (strq != NULL)) {
	moved = sctp_move_to_outqueue(stcb, net, strq, space_left,
	                              frag_point, &giveup, eeor_mode,
	                              &bail, so_locked);
	if ((giveup != 0) || (bail != 0)) {
		break;
	}
	strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
	total_moved += moved;
	if (space_left >= moved) {
		space_left -= moved;
	} else {
		space_left = 0;
	}
	if (space_left >= SCTP_DATA_CHUNK_OVERHEAD(stcb)) {
		space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
	} else {
		space_left = 0;
	}
	space_left &= 0xfffffffc;
}
if (bail != 0)
	*quit_now = 1;

stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);

if (total_moved == 0) {
	if ((stcb->asoc.sctp_cmt_on_off == 0) &&
	    (net == stcb->asoc.primary_destination)) {
		/* ran dry for primary network net */
		SCTP_STAT_INCR(sctps_primary_randry);
	} else if (stcb->asoc.sctp_cmt_on_off > 0) {
		/* ran dry with CMT on */
		SCTP_STAT_INCR(sctps_cmt_randry);
	}
}
}

void
sctp_fix_ecn_echo(struct sctp_association *asoc)
{
struct sctp_tmit_chunk *chk;

TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
	if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
		chk->sent = SCTP_DATAGRAM_UNSENT;
	}
}
}

void
sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
{
struct sctp_association *asoc;
struct sctp_tmit_chunk *chk;
struct sctp_stream_queue_pending *sp;
unsigned int i;

if (net == NULL) {
	return;
}
asoc = &stcb->asoc;
for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
	TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
		if (sp->net == net) {
			sctp_free_remote_addr(sp->net);
			sp->net = NULL;
		}
	}
}
TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
	if (chk->whoTo == net) {
		sctp_free_remote_addr(chk->whoTo);
		chk->whoTo = NULL;
	}
}
}

int
sctp_med_chunk_output(struct sctp_inpcb *inp,
                     struct sctp_tcb *stcb,
                     struct sctp_association *asoc,
                     int *num_out,
                     int *reason_code,
                     int control_only, int from_where,
                     struct timeval *now, int *now_filled,
                     uint32_t frag_point, int so_locked)
{
/**
 * Ok this is the generic chunk service queue. we must do the
 * following:
 * - Service the stream queue that is next, moving any
 *   message (note I must get a complete message i.e. FIRST/MIDDLE and
 *   LAST to the out queue in one pass) and assigning TSN's. This
 *   only applies though if the peer does not support NDATA. For NDATA
 *   chunks its ok to not send the entire message ;-)
 * - Check to see if the cwnd/rwnd allows any output, if so we go ahead and
 *   formulate and send the low level chunks. Making sure to combine
 *   any control in the control chunk queue also.
 */
struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
struct mbuf *outchain, *endoutchain;
struct sctp_tmit_chunk *chk, *nchk;

/* temp arrays for unlinking */
struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
int no_fragmentflg, error;
unsigned int max_rwnd_per_dest, max_send_per_dest;
int one_chunk, hbflag, skip_data_for_this_net;
int asconf, cookie, no_out_cnt;
int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
int tsns_sent = 0;
uint32_t auth_offset;
struct sctp_auth_chunk *auth;
uint16_t auth_keyid;
int override_ok = 1;
int skip_fill_up = 0;
int data_auth_reqd = 0;
/* JRS 5/14/07 - Add flag for whether a heartbeat is sent to
   the destination. */
int quit_now = 0;
bool use_zero_crc;

#if defined(__APPLE__) && !defined(__Userspace__)
if (so_locked) {
	sctp_lock_assert(SCTP_INP_SO(inp));
} else {
	sctp_unlock_assert(SCTP_INP_SO(inp));
}
#endif
*num_out = 0;
*reason_code = 0;
auth_keyid = stcb->asoc.authinfo.active_keyid;
if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
    (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
    (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
	eeor_mode = 1;
} else {
	eeor_mode = 0;
}
ctl_cnt = no_out_cnt = asconf = cookie = 0;
/*
 * First lets prime the pump. For each destination, if there is room
 * in the flight size, attempt to pull an MTU's worth out of the
 * stream queues into the general send_queue
 */
#ifdef SCTP_AUDITING_ENABLED
sctp_audit_log(0xC2, 2);
#endif
SCTP_TCB_LOCK_ASSERT(stcb);
hbflag = 0;
if (control_only)
	no_data_chunks = 1;
else
	no_data_chunks = 0;

/* Nothing to possible to send? */
if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
    TAILQ_EMPTY(&asoc->asconf_send_queue) &&
    TAILQ_EMPTY(&asoc->send_queue) &&
    sctp_is_there_unsent_data(stcb, so_locked) == 0) {
nothing_to_send:
	*reason_code = 9;
	return (0);
}
if (asoc->peers_rwnd == 0) {
	/* No room in peers rwnd */
	*reason_code = 1;
	if (asoc->total_flight > 0) {
		/* we are allowed one chunk in flight */
		no_data_chunks = 1;
	}
}
if (stcb->asoc.ecn_echo_cnt_onq) {
	/* Record where a sack goes, if any */
	if (no_data_chunks &&
	    (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
		/* Nothing but ECNe to send - we don't do that */
		goto nothing_to_send;
	}
	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
		if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
		    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
			sack_goes_to = chk->whoTo;
			break;
		}
	}
}
max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
if (stcb->sctp_socket)
	max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
else
	max_send_per_dest = 0;
if (no_data_chunks == 0) {
	/* How many non-directed chunks are there? */
	TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
		if (chk->whoTo == NULL) {
			/* We already have non-directed
			 * chunks on the queue, no need
			 * to do a fill-up.
			 */
			skip_fill_up = 1;
			break;
		}
	}
}
if ((no_data_chunks == 0) &&
    (skip_fill_up == 0) &&
    (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
	TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
		/*
		 * This for loop we are in takes in
		 * each net, if its's got space in cwnd and
		 * has data sent to it (when CMT is off) then it
		 * calls sctp_fill_outqueue for the net. This gets
		 * data on the send queue for that network.
		 *
		 * In sctp_fill_outqueue TSN's are assigned and
		 * data is copied out of the stream buffers. Note
		 * mostly copy by reference (we hope).
		 */
		net->window_probe = 0;
		if ((net != stcb->asoc.alternate) &&
		    ((net->dest_state & SCTP_ADDR_PF) ||
		     ((net->dest_state & SCTP_ADDR_REACHABLE) == 0) ||
		     (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
				sctp_log_cwnd(stcb, net, 1,
				              SCTP_CWND_LOG_FILL_OUTQ_CALLED);
			}
			continue;
		}
		if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
		    (net->flight_size == 0)) {
			(*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins)(stcb, net);
		}
		if (net->flight_size >= net->cwnd) {
			/* skip this network, no room - can't fill */
			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
				sctp_log_cwnd(stcb, net, 3,
				              SCTP_CWND_LOG_FILL_OUTQ_CALLED);
			}
			continue;
		}
		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
			sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
		}
		sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
		if (quit_now) {
			/* memory alloc failure */
			no_data_chunks = 1;
			break;
		}
	}
}
/* now service each destination and send out what we can for it */
/* Nothing to send? */
if (TAILQ_EMPTY(&asoc->control_send_queue) &&
    TAILQ_EMPTY(&asoc->asconf_send_queue) &&
    TAILQ_EMPTY(&asoc->send_queue)) {
	*reason_code = 8;
	return (0);
}

if (asoc->sctp_cmt_on_off > 0) {
	/* get the last start point */
	start_at = asoc->last_net_cmt_send_started;
	if (start_at == NULL) {
		/* null so to beginning */
		start_at = TAILQ_FIRST(&asoc->nets);
	} else {
		start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
		if (start_at == NULL) {
			start_at = TAILQ_FIRST(&asoc->nets);
		}
	}
	asoc->last_net_cmt_send_started = start_at;
} else {
	start_at = TAILQ_FIRST(&asoc->nets);
}
TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
	if (chk->whoTo == NULL) {
		if (asoc->alternate) {
			chk->whoTo = asoc->alternate;
		} else {
			chk->whoTo = asoc->primary_destination;
		}
		atomic_add_int(&chk->whoTo->ref_count, 1);
	}
}
old_start_at = NULL;
again_one_more_time:
for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
	/* how much can we send? */
	/* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
	if (old_start_at && (old_start_at == net)) {
		/* through list completely. */
		break;
	}
	tsns_sent = 0xa;
	if (TAILQ_EMPTY(&asoc->control_send_queue) &&
	    TAILQ_EMPTY(&asoc->asconf_send_queue) &&
	    (net->flight_size >= net->cwnd)) {
		/* Nothing on control or asconf and flight is full, we can skip
		 * even in the CMT case.
		 */
		continue;
	}
	bundle_at = 0;
	endoutchain = outchain = NULL;
	auth = NULL;
	auth_offset = 0;
	no_fragmentflg = 1;
	one_chunk = 0;
	if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
		skip_data_for_this_net = 1;
	} else {
		skip_data_for_this_net = 0;
	}
	switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
#ifdef INET
	case AF_INET:
		mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
		break;
#endif
#ifdef INET6
	case AF_INET6:
		mtu = net->mtu - SCTP_MIN_OVERHEAD;
		break;
#endif
#if defined(__Userspace__)
	case AF_CONN:
		mtu = net->mtu - sizeof(struct sctphdr);
		break;
#endif
	default:
		/* TSNH */
		mtu = net->mtu;
		break;
	}
	mx_mtu = mtu;
	to_out = 0;
	if (mtu > asoc->peers_rwnd) {
		if (asoc->total_flight > 0) {
			/* We have a packet in flight somewhere */
			r_mtu = asoc->peers_rwnd;
		} else {
			/* We are always allowed to send one MTU out */
			one_chunk = 1;
			r_mtu = mtu;
		}
	} else {
		r_mtu = mtu;
	}
	error = 0;
	/************************/
	/* ASCONF transmission */
	/************************/
	/* Now first lets go through the asconf queue */
	TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
		if (chk->rec.chunk_id.id != SCTP_ASCONF) {
			continue;
		}
		if (chk->whoTo == NULL) {
			if (asoc->alternate == NULL) {
				if (asoc->primary_destination != net) {
					break;
				}
			} else {
				if (asoc->alternate != net) {
					break;
				}
			}
		} else {
			if (chk->whoTo != net) {
				break;
			}
		}
		if (chk->data == NULL) {
			break;
		}
		if (chk->sent != SCTP_DATAGRAM_UNSENT &&
		    chk->sent != SCTP_DATAGRAM_RESEND) {
			break;
		}
		/*
		 * if no AUTH is yet included and this chunk
		 * requires it, make sure to account for it.  We
		 * don't apply the size until the AUTH chunk is
		 * actually added below in case there is no room for
		 * this chunk. NOTE: we overload the use of "omtu"
		 * here
		 */
		if ((auth == NULL) &&
		    sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
						stcb->asoc.peer_auth_chunks)) {
			omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
		} else
			omtu = 0;
		/* Here we do NOT factor the r_mtu */
		if ((chk->send_size < (int)(mtu - omtu)) ||
		    (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
			/*
			 * We probably should glom the mbuf chain
			 * from the chk->data for control but the
			 * problem is it becomes yet one more level
			 * of tracking to do if for some reason
			 * output fails. Then I have got to
			 * reconstruct the merged control chain.. el
			 * yucko.. for now we take the easy way and
			 * do the copy
			 */
			/*
			 * Add an AUTH chunk, if chunk requires it
			 * save the offset into the chain for AUTH
			 */
			if ((auth == NULL) &&
			    (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
							 stcb->asoc.peer_auth_chunks))) {
				outchain = sctp_add_auth_chunk(outchain,
							       &endoutchain,
							       &auth,
							       &auth_offset,
							       stcb,
							       chk->rec.chunk_id.id);
				SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
			}
			outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
						       (int)chk->rec.chunk_id.can_take_data,
						       chk->send_size, chk->copy_by_ref);
			if (outchain == NULL) {
				*reason_code = 8;
				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
				return (ENOMEM);
			}
			SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
			/* update our MTU size */
			if (mtu > (chk->send_size + omtu))
				mtu -= (chk->send_size + omtu);
			else
				mtu = 0;
			to_out += (chk->send_size + omtu);
			/* Do clear IP_DF ? */
			if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
				no_fragmentflg = 0;
			}
			if (chk->rec.chunk_id.can_take_data)
				chk->data = NULL;
			/*
			 * set hb flag since we can
			 * use these for RTO
			 */
			hbflag = 1;
			asconf = 1;
			/*
			 * should sysctl this: don't
			 * bundle data with ASCONF
			 * since it requires AUTH
			 */
			no_data_chunks = 1;
			chk->sent = SCTP_DATAGRAM_SENT;
			if (chk->whoTo == NULL) {
				chk->whoTo = net;
				atomic_add_int(&net->ref_count, 1);
			}
			chk->snd_count++;
			if (mtu == 0) {
				/*
				 * Ok we are out of room but we can
				 * output without effecting the
				 * flight size since this little guy
				 * is a control only packet.
				 */
				sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
				/*
				 * do NOT clear the asconf
				 * flag as it is used to do
				 * appropriate source address
				 * selection.
				 */
				if (*now_filled == 0) {
					(void)SCTP_GETTIME_TIMEVAL(now);
					*now_filled = 1;
				}
				net->last_sent_time = *now;
				hbflag = 0;
				if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
				                                        (struct sockaddr *)&net->ro._l_addr,
				                                        outchain, auth_offset, auth,
				                                        stcb->asoc.authinfo.active_keyid,
				                                        no_fragmentflg, 0, asconf,
				                                        inp->sctp_lport, stcb->rport,
				                                        htonl(stcb->asoc.peer_vtag),
				                                        net->port, NULL,
#if defined(__FreeBSD__) && !defined(__Userspace__)
				                                        0, 0,
#endif
				                                        false, so_locked))) {
					/* error, we could not output */
					SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
					if (from_where == 0) {
						SCTP_STAT_INCR(sctps_lowlevelerrusr);
					}
					if (error == ENOBUFS) {
						asoc->ifp_had_enobuf = 1;
						SCTP_STAT_INCR(sctps_lowlevelerr);
					}
					/* error, could not output */
					if (error == EHOSTUNREACH) {
						/*
						 * Destination went
						 * unreachable
						 * during this send
						 */
						sctp_move_chunks_from_net(stcb, net);
					}
					asconf = 0;
					*reason_code = 7;
					break;
				} else {
					asoc->ifp_had_enobuf = 0;
				}
				/*
				 * increase the number we sent, if a
				 * cookie is sent we don't tell them
				 * any was sent out.
				 */
				outchain = endoutchain = NULL;
				auth = NULL;
				auth_offset = 0;
				asconf = 0;
				if (!no_out_cnt)
					*num_out += ctl_cnt;
				/* recalc a clean slate and setup */
				switch (net->ro._l_addr.sa.sa_family) {
#ifdef INET
					case AF_INET:
						mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
						break;
#endif
#ifdef INET6
					case AF_INET6:
						mtu = net->mtu - SCTP_MIN_OVERHEAD;
						break;
#endif
#if defined(__Userspace__)
					case AF_CONN:
						mtu = net->mtu - sizeof(struct sctphdr);
						break;
#endif
					default:
						/* TSNH */
						mtu = net->mtu;
						break;
				}
				to_out = 0;
				no_fragmentflg = 1;
			}
		}
	}
	if (error != 0) {
		/* try next net */
		continue;
	}
	/************************/
	/* Control transmission */
	/************************/
	/* Now first lets go through the control queue */
	TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
		if ((sack_goes_to) &&
		    (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
		    (chk->whoTo != sack_goes_to)) {
			/*
			 * if we have a sack in queue, and we are looking at an
			 * ecn echo that is NOT queued to where the sack is going..
			 */
			if (chk->whoTo == net) {
				/* Don't transmit it to where its going (current net) */
				continue;
			} else if (sack_goes_to == net) {
				/* But do transmit it to this address */
				goto skip_net_check;
			}
		}
		if (chk->whoTo == NULL) {
			if (asoc->alternate == NULL) {
				if (asoc->primary_destination != net) {
					continue;
				}
			} else {
				if (asoc->alternate != net) {
					continue;
				}
			}
		} else {
			if (chk->whoTo != net) {
				continue;
			}
		}
	skip_net_check:
		if (chk->data == NULL) {
			continue;
		}
		if (chk->sent != SCTP_DATAGRAM_UNSENT) {
			/*
			 * It must be unsent. Cookies and ASCONF's
			 * hang around but there timers will force
			 * when marked for resend.
			 */
			continue;
		}
		/*
		 * if no AUTH is yet included and this chunk
		 * requires it, make sure to account for it.  We
		 * don't apply the size until the AUTH chunk is
		 * actually added below in case there is no room for
		 * this chunk. NOTE: we overload the use of "omtu"
		 * here
		 */
		if ((auth == NULL) &&
		    sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
						stcb->asoc.peer_auth_chunks)) {
			omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
		} else
			omtu = 0;
		/* Here we do NOT factor the r_mtu */
		if ((chk->send_size <= (int)(mtu - omtu)) ||
		    (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
			/*
			 * We probably should glom the mbuf chain
			 * from the chk->data for control but the
			 * problem is it becomes yet one more level
			 * of tracking to do if for some reason
			 * output fails. Then I have got to
			 * reconstruct the merged control chain.. el
			 * yucko.. for now we take the easy way and
			 * do the copy
			 */
			/*
			 * Add an AUTH chunk, if chunk requires it
			 * save the offset into the chain for AUTH
			 */
			if ((auth == NULL) &&
			    (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
							 stcb->asoc.peer_auth_chunks))) {
				outchain = sctp_add_auth_chunk(outchain,
							       &endoutchain,
							       &auth,
							       &auth_offset,
							       stcb,
							       chk->rec.chunk_id.id);
				SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
			}
			outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
						       (int)chk->rec.chunk_id.can_take_data,
						       chk->send_size, chk->copy_by_ref);
			if (outchain == NULL) {
				*reason_code = 8;
				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
				return (ENOMEM);
			}
			SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
			/* update our MTU size */
			if (mtu > (chk->send_size + omtu))
				mtu -= (chk->send_size + omtu);
			else
				mtu = 0;
			to_out += (chk->send_size + omtu);
			/* Do clear IP_DF ? */
			if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
				no_fragmentflg = 0;
			}
			if (chk->rec.chunk_id.can_take_data)
				chk->data = NULL;
			/* Mark things to be removed, if needed */
			if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
			    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) || /* EY */
			    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
			    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
			    (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
			    (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
			    (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
			    (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
			    (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
			    (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
			    (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
				if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
					hbflag = 1;
				}
				/* remove these chunks at the end */
				if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
				    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
					/* turn off the timer */
					if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
						sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
						                inp, stcb, NULL,
						                SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
					}
				}
				ctl_cnt++;
			} else {
				/*
				 * Other chunks, since they have
				 * timers running (i.e. COOKIE)
				 * we just "trust" that it
				 * gets sent or retransmitted.
				 */
				ctl_cnt++;
				if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
					cookie = 1;
					no_out_cnt = 1;
				} else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
					/*
					 * Increment ecne send count here
					 * this means we may be over-zealous in
					 * our counting if the send fails, but its
					 * the best place to do it (we used to do
					 * it in the queue of the chunk, but that did
					 * not tell how many times it was sent.
					 */
					SCTP_STAT_INCR(sctps_sendecne);
				}
				chk->sent = SCTP_DATAGRAM_SENT;
				if (chk->whoTo == NULL) {
					chk->whoTo = net;
					atomic_add_int(&net->ref_count, 1);
				}
				chk->snd_count++;
			}
			if (mtu == 0) {
				/*
				 * Ok we are out of room but we can
				 * output without effecting the
				 * flight size since this little guy
				 * is a control only packet.
				 */
				switch (asoc->snd_edmid) {
				case SCTP_EDMID_LOWER_LAYER_DTLS:
					use_zero_crc = true;
					break;
				default:
					use_zero_crc = false;
					break;
				}
				if (asconf) {
					sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
					use_zero_crc = false;
					/*
					 * do NOT clear the asconf
					 * flag as it is used to do
					 * appropriate source address
					 * selection.
					 */
				}
				if (cookie) {
					sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
					use_zero_crc = false;
					cookie = 0;
				}
				/* Only HB or ASCONF advances time */
				if (hbflag) {
					if (*now_filled == 0) {
						(void)SCTP_GETTIME_TIMEVAL(now);
						*now_filled = 1;
					}
					net->last_sent_time = *now;
					hbflag = 0;
				}
				if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
				                                        (struct sockaddr *)&net->ro._l_addr,
				                                        outchain,
				                                        auth_offset, auth,
				                                        stcb->asoc.authinfo.active_keyid,
				                                        no_fragmentflg, 0, asconf,
				                                        inp->sctp_lport, stcb->rport,
				                                        htonl(stcb->asoc.peer_vtag),
				                                        net->port, NULL,
#if defined(__FreeBSD__) && !defined(__Userspace__)
				                                        0, 0,
#endif
				                                        use_zero_crc, so_locked))) {
					/* error, we could not output */
					SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
					if (from_where == 0) {
						SCTP_STAT_INCR(sctps_lowlevelerrusr);
					}
					if (error == ENOBUFS) {
						asoc->ifp_had_enobuf = 1;
						SCTP_STAT_INCR(sctps_lowlevelerr);
					}
					if (error == EHOSTUNREACH) {
						/*
						 * Destination went
						 * unreachable
						 * during this send
						 */
						sctp_move_chunks_from_net(stcb, net);
					}
					asconf = 0;
					*reason_code = 7;
					break;
				} else {
					asoc->ifp_had_enobuf = 0;
				}
				/*
				 * increase the number we sent, if a
				 * cookie is sent we don't tell them
				 * any was sent out.
				 */
				outchain = endoutchain = NULL;
				auth = NULL;
				auth_offset = 0;
				asconf = 0;
				if (!no_out_cnt)
					*num_out += ctl_cnt;
				/* recalc a clean slate and setup */
				switch (net->ro._l_addr.sa.sa_family) {
#ifdef INET
					case AF_INET:
						mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
						break;
#endif
#ifdef INET6
					case AF_INET6:
						mtu = net->mtu - SCTP_MIN_OVERHEAD;
						break;
#endif
#if defined(__Userspace__)
					case AF_CONN:
						mtu = net->mtu - sizeof(struct sctphdr);
						break;
#endif
					default:
						/* TSNH */
						mtu = net->mtu;
						break;
				}
				to_out = 0;
				no_fragmentflg = 1;
			}
		}
	}
	if (error != 0) {
		/* try next net */
		continue;
	}
	/* JRI: if dest is in PF state, do not send data to it */
	if ((asoc->sctp_cmt_on_off > 0) &&
	    (net != stcb->asoc.alternate) &&
	    (net->dest_state & SCTP_ADDR_PF)) {
		goto no_data_fill;
	}
	if (net->flight_size >= net->cwnd) {
		goto no_data_fill;
	}
	if ((asoc->sctp_cmt_on_off > 0) &&
	    (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
	    (net->flight_size > max_rwnd_per_dest)) {
		goto no_data_fill;
	}
	/*
	 * We need a specific accounting for the usage of the
	 * send buffer. We also need to check the number of messages
	 * per net. For now, this is better than nothing and it
	 * disabled by default...
	 */
	if ((asoc->sctp_cmt_on_off > 0) &&
	    (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
	    (max_send_per_dest > 0) &&
	    (net->flight_size > max_send_per_dest)) {
		goto no_data_fill;
	}
	/*********************/
	/* Data transmission */
	/*********************/
	/*
	 * if AUTH for DATA is required and no AUTH has been added
	 * yet, account for this in the mtu now... if no data can be
	 * bundled, this adjustment won't matter anyways since the
	 * packet will be going out...
	 */
	data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
						     stcb->asoc.peer_auth_chunks);
	if (data_auth_reqd && (auth == NULL)) {
		mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
	}
	/* now lets add any data within the MTU constraints */
	switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
#ifdef INET
	case AF_INET:
		if (net->mtu > SCTP_MIN_V4_OVERHEAD)
			omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
		else
			omtu = 0;
		break;
#endif
#ifdef INET6
	case AF_INET6:
		if (net->mtu > SCTP_MIN_OVERHEAD)
			omtu = net->mtu - SCTP_MIN_OVERHEAD;
		else
			omtu = 0;
		break;
#endif
#if defined(__Userspace__)
	case AF_CONN:
		if (net->mtu > sizeof(struct sctphdr)) {
			omtu = net->mtu - sizeof(struct sctphdr);
		} else {
			omtu = 0;
		}
		break;
#endif
	default:
		/* TSNH */
		omtu = 0;
		break;
	}
	if ((((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
	      (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
	     (skip_data_for_this_net == 0)) ||
	    (cookie)) {
		TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
			if (no_data_chunks) {
				/* let only control go out */
				*reason_code = 1;
				break;
			}
			if (net->flight_size >= net->cwnd) {
				/* skip this net, no room for data */
				*reason_code = 2;
				break;
			}
			if ((chk->whoTo != NULL) &&
			    (chk->whoTo != net)) {
				/* Don't send the chunk on this net */
				continue;
			}

			if (asoc->sctp_cmt_on_off == 0) {
				if ((asoc->alternate) &&
				    (asoc->alternate != net) &&
				    (chk->whoTo == NULL)) {
					continue;
				} else if ((net != asoc->primary_destination) &&
					   (asoc->alternate == NULL) &&
					   (chk->whoTo == NULL)) {
					continue;
				}
			}
			if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
				/*-
				 * strange, we have a chunk that is
				 * to big for its destination and
				 * yet no fragment ok flag.
				 * Something went wrong when the
				 * PMTU changed...we did not mark
				 * this chunk for some reason?? I
				 * will fix it here by letting IP
				 * fragment it for now and printing
				 * a warning. This really should not
				 * happen ...
				 */
				SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
					    chk->send_size, mtu);
				chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
			}
			if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
			    (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
				struct sctp_data_chunk *dchkh;

				dchkh = mtod(chk->data, struct sctp_data_chunk *);
				dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
			}
			if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
			    ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
				/* ok we will add this one */

				/*
				 * Add an AUTH chunk, if chunk
				 * requires it, save the offset into
				 * the chain for AUTH
				 */
				if (data_auth_reqd) {
					if (auth == NULL) {
						outchain = sctp_add_auth_chunk(outchain,
									       &endoutchain,
									       &auth,
									       &auth_offset,
									       stcb,
									       SCTP_DATA);
						auth_keyid = chk->auth_keyid;
						override_ok = 0;
						SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
					} else if (override_ok) {
						/* use this data's keyid */
						auth_keyid = chk->auth_keyid;
						override_ok = 0;
					} else if (auth_keyid != chk->auth_keyid) {
						/* different keyid, so done bundling */
						break;
					}
				}
				outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
							       chk->send_size, chk->copy_by_ref);
				if (outchain == NULL) {
					SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
					if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
						sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
					}
					*reason_code = 3;
					SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
					return (ENOMEM);
				}
				/* update our MTU size */
				/* Do clear IP_DF ? */
				if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
					no_fragmentflg = 0;
				}
				/* unsigned subtraction of mtu */
				if (mtu > chk->send_size)
					mtu -= chk->send_size;
				else
					mtu = 0;
				/* unsigned subtraction of r_mtu */
				if (r_mtu > chk->send_size)
					r_mtu -= chk->send_size;
				else
					r_mtu = 0;

				to_out += chk->send_size;
				if ((to_out > mx_mtu) && no_fragmentflg) {
#ifdef INVARIANTS
					panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
#else
					SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
						    mx_mtu, to_out);
#endif
				}
				chk->window_probe = 0;
				data_list[bundle_at++] = chk;
				if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
					break;
				}
				if (chk->sent == SCTP_DATAGRAM_UNSENT) {
					if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
						SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
					} else {
						SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
					}
					if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
					    ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
						/* Count number of user msg's that were fragmented
						 * we do this by counting when we see a LAST fragment
						 * only.
						 */
						SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
				}
				if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
					if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
						data_list[0]->window_probe = 1;
						net->window_probe = 1;
					}
					break;
				}
			} else {
				/*
				 * Must be sent in order of the
				 * TSN's (on a network)
				 */
				break;
			}
		}	/* for (chunk gather loop for this net) */
	}		/* if asoc.state OPEN */
no_data_fill:
	/* Is there something to send for this destination? */
	if (outchain) {
		switch (asoc->snd_edmid) {
		case SCTP_EDMID_LOWER_LAYER_DTLS:
			use_zero_crc = true;
			break;
		default:
			use_zero_crc = false;
			break;
		}
		/* We may need to start a control timer or two */
		if (asconf) {
			sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
					 stcb, net);
			use_zero_crc = false;
			/*
			 * do NOT clear the asconf flag as it is used
			 * to do appropriate source address selection.
			 */
		}
		if (cookie) {
			sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
			use_zero_crc = false;
			cookie = 0;
		}
		/* must start a send timer if data is being sent */
		if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
			/*
			 * no timer running on this destination
			 * restart it.
			 */
			sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
		}
		if (bundle_at || hbflag) {
			/* For data/asconf and hb set time */
			if (*now_filled == 0) {
				(void)SCTP_GETTIME_TIMEVAL(now);
				*now_filled = 1;
			}
			net->last_sent_time = *now;
		}
		/* Now send it, if there is anything to send :> */
		if ((error = sctp_lowlevel_chunk_output(inp,
		                                        stcb,
		                                        net,
		                                        (struct sockaddr *)&net->ro._l_addr,
		                                        outchain,
		                                        auth_offset,
		                                        auth,
		                                        auth_keyid,
		                                        no_fragmentflg,
		                                        bundle_at,
		                                        asconf,
		                                        inp->sctp_lport, stcb->rport,
		                                        htonl(stcb->asoc.peer_vtag),
		                                        net->port, NULL,
#if defined(__FreeBSD__) && !defined(__Userspace__)
		                                        0, 0,
#endif
		                                        use_zero_crc,
		                                        so_locked))) {
			/* error, we could not output */
			SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
			if (from_where == 0) {
				SCTP_STAT_INCR(sctps_lowlevelerrusr);
			}
			if (error == ENOBUFS) {
				asoc->ifp_had_enobuf = 1;
				SCTP_STAT_INCR(sctps_lowlevelerr);
			}
			if (error == EHOSTUNREACH) {
				/*
				 * Destination went unreachable
				 * during this send
				 */
				sctp_move_chunks_from_net(stcb, net);
			}
			asconf = 0;
			*reason_code = 6;
			/*-
			 * I add this line to be paranoid. As far as
			 * I can tell the continue, takes us back to
			 * the top of the for, but just to make sure
			 * I will reset these again here.
			 */
			ctl_cnt = 0;
			continue; /* This takes us back to the for() for the nets. */
		} else {
			asoc->ifp_had_enobuf = 0;
		}
		endoutchain = NULL;
		auth = NULL;
		auth_offset = 0;
		asconf = 0;
		if (!no_out_cnt) {
			*num_out += (ctl_cnt + bundle_at);
		}
		if (bundle_at) {
			/* setup for a RTO measurement */
			tsns_sent = data_list[0]->rec.data.tsn;
			/* fill time if not already filled */
			if (*now_filled == 0) {
				(void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
				*now_filled = 1;
				*now = asoc->time_last_sent;
			} else {
				asoc->time_last_sent = *now;
			}
			if (net->rto_needed) {
				data_list[0]->do_rtt = 1;
				net->rto_needed = 0;
			}
			SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
			sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
		}
		if (one_chunk) {
			break;
		}
	}
	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
		sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
	}
}
if (old_start_at == NULL) {
	old_start_at = start_at;
	start_at = TAILQ_FIRST(&asoc->nets);
	if (old_start_at)
		goto again_one_more_time;
}

/*
 * At the end there should be no NON timed chunks hanging on this
 * queue.
 */
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
	sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
}
if ((*num_out == 0) && (*reason_code == 0)) {
	*reason_code = 4;
} else {
	*reason_code = 5;
}
sctp_clean_up_ctl(stcb, asoc, so_locked);
return (0);
}

void
sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
{
/*-
 * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
 * the control chunk queue.
 */
struct sctp_chunkhdr *hdr;
struct sctp_tmit_chunk *chk;
struct mbuf *mat, *last_mbuf;
uint32_t chunk_length;
uint16_t padding_length;

SCTP_TCB_LOCK_ASSERT(stcb);
SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
if (op_err == NULL) {
	return;
}
last_mbuf = NULL;
chunk_length = 0;
for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
	chunk_length += SCTP_BUF_LEN(mat);
	if (SCTP_BUF_NEXT(mat) == NULL) {
		last_mbuf = mat;
	}
}
if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
	sctp_m_freem(op_err);
	return;
}
padding_length = chunk_length % 4;
if (padding_length != 0) {
	padding_length = 4 - padding_length;
}
if (padding_length != 0) {
	if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
		sctp_m_freem(op_err);
		return;
	}
}
sctp_alloc_a_chunk(stcb, chk);
if (chk == NULL) {
	/* no memory */
	sctp_m_freem(op_err);
	return;
}
chk->copy_by_ref = 0;
chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
chk->rec.chunk_id.can_take_data = 0;
chk->flags = 0;
chk->send_size = (uint16_t)chunk_length;
chk->sent = SCTP_DATAGRAM_UNSENT;
chk->snd_count = 0;
chk->asoc = &stcb->asoc;
chk->data = op_err;
chk->whoTo = NULL;
hdr = mtod(op_err, struct sctp_chunkhdr *);
hdr->chunk_type = SCTP_OPERATION_ERROR;
hdr->chunk_flags = 0;
hdr->chunk_length = htons(chk->send_size);
TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
chk->asoc->ctrl_queue_cnt++;
}

int
sctp_send_cookie_echo(struct mbuf *m,
   int offset, int limit,
   struct sctp_tcb *stcb,
   struct sctp_nets *net)
{
/*-
 * pull out the cookie and put it at the front of the control chunk
 * queue.
 */
int at;
struct mbuf *cookie;
struct sctp_paramhdr param, *phdr;
struct sctp_chunkhdr *hdr;
struct sctp_tmit_chunk *chk;
uint16_t ptype, plen;

SCTP_TCB_LOCK_ASSERT(stcb);
/* First find the cookie in the param area */
cookie = NULL;
at = offset + sizeof(struct sctp_init_chunk);
for (;;) {
	phdr = sctp_get_next_param(m, at, &param, sizeof(param));
	if (phdr == NULL) {
		return (-3);
	}
	ptype = ntohs(phdr->param_type);
	plen = ntohs(phdr->param_length);
	if (plen < sizeof(struct sctp_paramhdr)) {
		return (-6);
	}
	if (ptype == SCTP_STATE_COOKIE) {
		int pad;

		/* found the cookie */
		if (at + plen > limit) {
			return (-7);
		}
		cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
		if (cookie == NULL) {
			/* No memory */
			return (-2);
		}
		if ((pad = (plen % 4)) > 0) {
			pad = 4 - pad;
		}
		if (pad > 0) {
			if (sctp_pad_lastmbuf(cookie, pad, NULL) == NULL) {
				return (-8);
			}
		}
#ifdef SCTP_MBUF_LOGGING
		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
			sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
		}
#endif
		break;
	}
	at += SCTP_SIZE32(plen);
}
/* ok, we got the cookie lets change it into a cookie echo chunk */
/* first the change from param to cookie */
hdr = mtod(cookie, struct sctp_chunkhdr *);
hdr->chunk_type = SCTP_COOKIE_ECHO;
hdr->chunk_flags = 0;
/* get the chunk stuff now and place it in the FRONT of the queue */
sctp_alloc_a_chunk(stcb, chk);
if (chk == NULL) {
	/* no memory */
	sctp_m_freem(cookie);
	return (-5);
}
chk->copy_by_ref = 0;
chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
chk->rec.chunk_id.can_take_data = 0;
chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
chk->send_size = SCTP_SIZE32(plen);
chk->sent = SCTP_DATAGRAM_UNSENT;
chk->snd_count = 0;
chk->asoc = &stcb->asoc;
chk->data = cookie;
chk->whoTo = net;
atomic_add_int(&chk->whoTo->ref_count, 1);
TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
chk->asoc->ctrl_queue_cnt++;
return (0);
}

void
sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
   struct mbuf *m,
   int offset,
   int chk_length,
   struct sctp_nets *net)
{
/*
 * take a HB request and make it into a HB ack and send it.
 */
struct mbuf *outchain;
struct sctp_chunkhdr *chdr;
struct sctp_tmit_chunk *chk;

if (net == NULL)
	/* must have a net pointer */
	return;

outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
if (outchain == NULL) {
	/* gak out of memory */
	return;
}
#ifdef SCTP_MBUF_LOGGING
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
	sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
}
#endif
chdr = mtod(outchain, struct sctp_chunkhdr *);
chdr->chunk_type = SCTP_HEARTBEAT_ACK;
chdr->chunk_flags = 0;
if (chk_length % 4 != 0) {
	sctp_pad_lastmbuf(outchain, 4 - (chk_length % 4), NULL);
}
sctp_alloc_a_chunk(stcb, chk);
if (chk == NULL) {
	/* no memory */
	sctp_m_freem(outchain);
	return;
}
chk->copy_by_ref = 0;
chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
chk->rec.chunk_id.can_take_data = 1;
chk->flags = 0;
chk->send_size = chk_length;
chk->sent = SCTP_DATAGRAM_UNSENT;
chk->snd_count = 0;
chk->asoc = &stcb->asoc;
chk->data = outchain;
chk->whoTo = net;
atomic_add_int(&chk->whoTo->ref_count, 1);
TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
chk->asoc->ctrl_queue_cnt++;
}

void
sctp_send_cookie_ack(struct sctp_tcb *stcb)
{
/* formulate and queue a cookie-ack back to sender */
struct mbuf *cookie_ack;
struct sctp_chunkhdr *hdr;
struct sctp_tmit_chunk *chk;

SCTP_TCB_LOCK_ASSERT(stcb);

cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
if (cookie_ack == NULL) {
	/* no mbuf's */
	return;
}
SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
sctp_alloc_a_chunk(stcb, chk);
if (chk == NULL) {
	/* no memory */
	sctp_m_freem(cookie_ack);
	return;
}
chk->copy_by_ref = 0;
chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
chk->rec.chunk_id.can_take_data = 1;
chk->flags = 0;
chk->send_size = sizeof(struct sctp_chunkhdr);
chk->sent = SCTP_DATAGRAM_UNSENT;
chk->snd_count = 0;
chk->asoc = &stcb->asoc;
chk->data = cookie_ack;
if (chk->asoc->last_control_chunk_from != NULL) {
	chk->whoTo = chk->asoc->last_control_chunk_from;
	atomic_add_int(&chk->whoTo->ref_count, 1);
} else {
	chk->whoTo = NULL;
}
hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
hdr->chunk_type = SCTP_COOKIE_ACK;
hdr->chunk_flags = 0;
hdr->chunk_length = htons(chk->send_size);
SCTP_BUF_LEN(cookie_ack) = chk->send_size;
TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
chk->asoc->ctrl_queue_cnt++;
return;
}

void
sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
{
/* formulate and queue a SHUTDOWN-ACK back to the sender */
struct mbuf *m_shutdown_ack;
struct sctp_shutdown_ack_chunk *ack_cp;
struct sctp_tmit_chunk *chk;

m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
if (m_shutdown_ack == NULL) {
	/* no mbuf's */
	return;
}
SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
sctp_alloc_a_chunk(stcb, chk);
if (chk == NULL) {
	/* no memory */
	sctp_m_freem(m_shutdown_ack);
	return;
}
chk->copy_by_ref = 0;
chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
chk->rec.chunk_id.can_take_data = 1;
chk->flags = 0;
chk->send_size = sizeof(struct sctp_chunkhdr);
chk->sent = SCTP_DATAGRAM_UNSENT;
chk->snd_count = 0;
chk->asoc = &stcb->asoc;
chk->data = m_shutdown_ack;
chk->whoTo = net;
if (chk->whoTo) {
	atomic_add_int(&chk->whoTo->ref_count, 1);
}
ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
ack_cp->ch.chunk_flags = 0;
ack_cp->ch.chunk_length = htons(chk->send_size);
SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
chk->asoc->ctrl_queue_cnt++;
return;
}

void
sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
{
/* formulate and queue a SHUTDOWN to the sender */
struct mbuf *m_shutdown;
struct sctp_shutdown_chunk *shutdown_cp;
struct sctp_tmit_chunk *chk;

TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
	if (chk->rec.chunk_id.id == SCTP_SHUTDOWN) {
		/* We already have a SHUTDOWN queued. Reuse it. */
		if (chk->whoTo) {
			sctp_free_remote_addr(chk->whoTo);
			chk->whoTo = NULL;
		}
		break;
	}
}
if (chk == NULL) {
	m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
	if (m_shutdown == NULL) {
		/* no mbuf's */
		return;
	}
	SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
	sctp_alloc_a_chunk(stcb, chk);
	if (chk == NULL) {
		/* no memory */
		sctp_m_freem(m_shutdown);
		return;
	}
	chk->copy_by_ref = 0;
	chk->rec.chunk_id.id = SCTP_SHUTDOWN;
	chk->rec.chunk_id.can_take_data = 1;
	chk->flags = 0;
	chk->send_size = sizeof(struct sctp_shutdown_chunk);
	chk->sent = SCTP_DATAGRAM_UNSENT;
	chk->snd_count = 0;
	chk->asoc = &stcb->asoc;
	chk->data = m_shutdown;
	chk->whoTo = net;
	if (chk->whoTo) {
		atomic_add_int(&chk->whoTo->ref_count, 1);
	}
	shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
	shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
	shutdown_cp->ch.chunk_flags = 0;
	shutdown_cp->ch.chunk_length = htons(chk->send_size);
	shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
	SCTP_BUF_LEN(m_shutdown) = chk->send_size;
	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
	chk->asoc->ctrl_queue_cnt++;
} else {
	TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, sctp_next);
	chk->whoTo = net;
	if (chk->whoTo) {
		atomic_add_int(&chk->whoTo->ref_count, 1);
	}
	shutdown_cp = mtod(chk->data, struct sctp_shutdown_chunk *);
	shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
	TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
}
return;
}

void
sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
{
/*
 * formulate and queue an ASCONF to the peer.
 * ASCONF parameters should be queued on the assoc queue.
 */
struct sctp_tmit_chunk *chk;
struct mbuf *m_asconf;
int len;

SCTP_TCB_LOCK_ASSERT(stcb);

if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
    (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
	/* can't send a new one if there is one in flight already */
	return;
}

/* compose an ASCONF chunk, maximum length is PMTU */
m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
if (m_asconf == NULL) {
	return;
}

sctp_alloc_a_chunk(stcb, chk);
if (chk == NULL) {
	/* no memory */
	sctp_m_freem(m_asconf);
	return;
}

chk->copy_by_ref = 0;
chk->rec.chunk_id.id = SCTP_ASCONF;
chk->rec.chunk_id.can_take_data = 0;
chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
chk->data = m_asconf;
chk->send_size = len;
chk->sent = SCTP_DATAGRAM_UNSENT;
chk->snd_count = 0;
chk->asoc = &stcb->asoc;
chk->whoTo = net;
if (chk->whoTo) {
	atomic_add_int(&chk->whoTo->ref_count, 1);
}
TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
chk->asoc->ctrl_queue_cnt++;
return;
}

void
sctp_send_asconf_ack(struct sctp_tcb *stcb)
{
/*
 * formulate and queue a asconf-ack back to sender.
 * the asconf-ack must be stored in the tcb.
 */
struct sctp_tmit_chunk *chk;
struct sctp_asconf_ack *ack, *latest_ack;
struct mbuf *m_ack;
struct sctp_nets *net = NULL;

SCTP_TCB_LOCK_ASSERT(stcb);
/* Get the latest ASCONF-ACK */
latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
if (latest_ack == NULL) {
	return;
}
if (latest_ack->last_sent_to != NULL &&
    latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
	/* we're doing a retransmission */
	net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
	if (net == NULL) {
		/* no alternate */
		if (stcb->asoc.last_control_chunk_from == NULL) {
			if (stcb->asoc.alternate) {
				net = stcb->asoc.alternate;
			} else {
				net = stcb->asoc.primary_destination;
			}
		} else {
			net = stcb->asoc.last_control_chunk_from;
		}
	}
} else {
	/* normal case */
	if (stcb->asoc.last_control_chunk_from == NULL) {
		if (stcb->asoc.alternate) {
			net = stcb->asoc.alternate;
		} else {
			net = stcb->asoc.primary_destination;
		}
	} else {
		net = stcb->asoc.last_control_chunk_from;
	}
}
latest_ack->last_sent_to = net;

TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
	if (ack->data == NULL) {
		continue;
	}

	/* copy the asconf_ack */
	m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
	if (m_ack == NULL) {
		/* couldn't copy it */
		return;
	}
#ifdef SCTP_MBUF_LOGGING
	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
		sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
	}
#endif

	sctp_alloc_a_chunk(stcb, chk);
	if (chk == NULL) {
		/* no memory */
		if (m_ack)
			sctp_m_freem(m_ack);
		return;
	}
	chk->copy_by_ref = 0;
	chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
	chk->rec.chunk_id.can_take_data = 1;
	chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
	chk->whoTo = net;
	if (chk->whoTo) {
		atomic_add_int(&chk->whoTo->ref_count, 1);
	}
	chk->data = m_ack;
	chk->send_size = ack->len;
	chk->sent = SCTP_DATAGRAM_UNSENT;
	chk->snd_count = 0;
	chk->asoc = &stcb->asoc;

	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
	chk->asoc->ctrl_queue_cnt++;
}
return;
}

static int
sctp_chunk_retransmission(struct sctp_inpcb *inp,
   struct sctp_tcb *stcb,
   struct sctp_association *asoc,
   int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked)
{
/*-
 * send out one MTU of retransmission. If fast_retransmit is
 * happening we ignore the cwnd. Otherwise we obey the cwnd and
 * rwnd. For a Cookie or Asconf in the control chunk queue we
 * retransmit them by themselves.
 *
 * For data chunks we will pick out the lowest TSN's in the sent_queue
 * marked for resend and bundle them all together (up to a MTU of
 * destination). The address to send to should have been
 * selected/changed where the retransmission was marked (i.e. in FR
 * or t3-timeout routines).
 */
struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
struct sctp_tmit_chunk *chk, *fwd;
struct mbuf *m, *endofchain;
struct sctp_nets *net = NULL;
uint32_t tsns_sent = 0;
int no_fragmentflg, bundle_at;
unsigned int mtu;
int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
struct sctp_auth_chunk *auth = NULL;
uint32_t auth_offset = 0;
uint16_t auth_keyid;
int override_ok = 1;
int data_auth_reqd = 0;
uint32_t dmtu = 0;
bool use_zero_crc;

#if defined(__APPLE__) && !defined(__Userspace__)
if (so_locked) {
	sctp_lock_assert(SCTP_INP_SO(inp));
} else {
	sctp_unlock_assert(SCTP_INP_SO(inp));
}
#endif
SCTP_TCB_LOCK_ASSERT(stcb);
tmr_started = ctl_cnt = 0;
no_fragmentflg = 1;
fwd_tsn = 0;
*cnt_out = 0;
fwd = NULL;
endofchain = m = NULL;
auth_keyid = stcb->asoc.authinfo.active_keyid;
#ifdef SCTP_AUDITING_ENABLED
sctp_audit_log(0xC3, 1);
#endif
if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
    (TAILQ_EMPTY(&asoc->control_send_queue))) {
	SCTPDBG(SCTP_DEBUG_OUTPUT1,"SCTP hits empty queue with cnt set to %d?\n",
		asoc->sent_queue_retran_cnt);
	asoc->sent_queue_cnt = 0;
	asoc->sent_queue_cnt_removeable = 0;
	/* send back 0/0 so we enter normal transmission */
	*cnt_out = 0;
	return (0);
}
TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
	if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
	    (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
	    (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
		if (chk->sent != SCTP_DATAGRAM_RESEND) {
			continue;
		}
		if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
			if (chk != asoc->str_reset) {
				/*
				 * not eligible for retran if its
				 * not ours
				 */
				continue;
			}
		}
		ctl_cnt++;
		if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
			fwd_tsn = 1;
		}
		/*
		 * Add an AUTH chunk, if chunk requires it save the
		 * offset into the chain for AUTH
		 */
		if ((auth == NULL) &&
		    (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
						 stcb->asoc.peer_auth_chunks))) {
			m = sctp_add_auth_chunk(m, &endofchain,
						&auth, &auth_offset,
						stcb,
						chk->rec.chunk_id.id);
			SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
		}
		m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
		break;
	}
}
one_chunk = 0;
/* do we have control chunks to retransmit? */
if (m != NULL) {
	/* Start a timer no matter if we succeed or fail */
	switch (asoc->snd_edmid) {
	case SCTP_EDMID_LOWER_LAYER_DTLS:
		use_zero_crc = true;
		break;
	default:
		use_zero_crc = false;
		break;
	}
	if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
		sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
		use_zero_crc = false;
	} else if (chk->rec.chunk_id.id == SCTP_ASCONF) {
		/* XXXMT: Can this happen? */
		sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
		use_zero_crc = false;
	}
	chk->snd_count++;	/* update our count */
	if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
	                                        (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
	                                        auth_offset, auth, stcb->asoc.authinfo.active_keyid,
	                                        no_fragmentflg, 0, 0,
	                                        inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
	                                        chk->whoTo->port, NULL,
#if defined(__FreeBSD__) && !defined(__Userspace__)
	                                        0, 0,
#endif
	                                        use_zero_crc,
	                                        so_locked))) {
		SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
		if (error == ENOBUFS) {
			asoc->ifp_had_enobuf = 1;
			SCTP_STAT_INCR(sctps_lowlevelerr);
		}
		return (error);
	} else {
		asoc->ifp_had_enobuf = 0;
	}
	endofchain = NULL;
	auth = NULL;
	auth_offset = 0;
	/*
	 * We don't want to mark the net->sent time here since this
	 * we use this for HB and retrans cannot measure RTT
	 */
	/* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
	*cnt_out += 1;
	chk->sent = SCTP_DATAGRAM_SENT;
	sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
	if (fwd_tsn == 0) {
		return (0);
	} else {
		/* Clean up the fwd-tsn list */
		sctp_clean_up_ctl(stcb, asoc, so_locked);
		return (0);
	}
}
/*
 * Ok, it is just data retransmission we need to do or that and a
 * fwd-tsn with it all.
 */
if (TAILQ_EMPTY(&asoc->sent_queue)) {
	return (SCTP_RETRAN_DONE);
}
if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) ||
    (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT)) {
	/* not yet open, resend the cookie and that is it */
	return (1);
}
#ifdef SCTP_AUDITING_ENABLED
sctp_auditing(20, inp, stcb, NULL);
#endif
data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
	if (chk->sent != SCTP_DATAGRAM_RESEND) {
		/* No, not sent to this net or not ready for rtx */
		continue;
	}
	if (chk->data == NULL) {
		SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
		            chk->rec.data.tsn, chk->snd_count, chk->sent);
		continue;
	}
	if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
	    (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
		struct mbuf *op_err;
		char msg[SCTP_DIAG_INFO_LEN];

		SCTP_SNPRINTF(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
		              chk->rec.data.tsn, chk->snd_count);
		op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
		                             msg);
		atomic_add_int(&stcb->asoc.refcnt, 1);
		sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
		                          false, so_locked);
		SCTP_TCB_LOCK(stcb);
		atomic_subtract_int(&stcb->asoc.refcnt, 1);
		return (SCTP_RETRAN_EXIT);
	}
	/* pick up the net */
	net = chk->whoTo;
	switch (net->ro._l_addr.sa.sa_family) {
#ifdef INET
		case AF_INET:
			mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
			break;
#endif
#ifdef INET6
		case AF_INET6:
			mtu = net->mtu - SCTP_MIN_OVERHEAD;
			break;
#endif
#if defined(__Userspace__)
		case AF_CONN:
			mtu = net->mtu - sizeof(struct sctphdr);
			break;
#endif
		default:
			/* TSNH */
			mtu = net->mtu;
			break;
	}

	if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
		/* No room in peers rwnd */
		uint32_t tsn;

		tsn = asoc->last_acked_seq + 1;
		if (tsn == chk->rec.data.tsn) {
			/*
			 * we make a special exception for this
			 * case. The peer has no rwnd but is missing
			 * the lowest chunk.. which is probably what
			 * is holding up the rwnd.
			 */
			goto one_chunk_around;
		}
		return (1);
	}
one_chunk_around:
	if (asoc->peers_rwnd < mtu) {
		one_chunk = 1;
		if ((asoc->peers_rwnd == 0) &&
		    (asoc->total_flight == 0)) {
			chk->window_probe = 1;
			chk->whoTo->window_probe = 1;
		}
	}
#ifdef SCTP_AUDITING_ENABLED
	sctp_audit_log(0xC3, 2);
#endif
	bundle_at = 0;
	m = NULL;
	net->fast_retran_ip = 0;
	if (chk->rec.data.doing_fast_retransmit == 0) {
		/*
		 * if no FR in progress skip destination that have
		 * flight_size > cwnd.
		 */
		if (net->flight_size >= net->cwnd) {
			continue;
		}
	} else {
		/*
		 * Mark the destination net to have FR recovery
		 * limits put on it.
		 */
		*fr_done = 1;
		net->fast_retran_ip = 1;
	}

	/*
	 * if no AUTH is yet included and this chunk requires it,
	 * make sure to account for it.  We don't apply the size
	 * until the AUTH chunk is actually added below in case
	 * there is no room for this chunk.
	 */
	if (data_auth_reqd && (auth == NULL)) {
		dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
	} else
		dmtu = 0;

	if ((chk->send_size <= (mtu - dmtu)) ||
	    (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
		/* ok we will add this one */
		if (data_auth_reqd) {
			if (auth == NULL) {
				m = sctp_add_auth_chunk(m,
							&endofchain,
							&auth,
							&auth_offset,
							stcb,
							SCTP_DATA);
				auth_keyid = chk->auth_keyid;
				override_ok = 0;
				SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
			} else if (override_ok) {
				auth_keyid = chk->auth_keyid;
				override_ok = 0;
			} else if (chk->auth_keyid != auth_keyid) {
				/* different keyid, so done bundling */
				break;
			}
		}
		m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
		if (m == NULL) {
			SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
			return (ENOMEM);
		}
		/* Do clear IP_DF ? */
		if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
			no_fragmentflg = 0;
		}
		/* update our MTU size */
		if (mtu > (chk->send_size + dmtu))
			mtu -= (chk->send_size + dmtu);
		else
			mtu = 0;
		data_list[bundle_at++] = chk;
		if (one_chunk && (asoc->total_flight <= 0)) {
			SCTP_STAT_INCR(sctps_windowprobed);
		}
	}
	if (one_chunk == 0) {
		/*
		 * now are there anymore forward from chk to pick
		 * up?
		 */
		for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
			if (fwd->sent != SCTP_DATAGRAM_RESEND) {
				/* Nope, not for retran */
				continue;
			}
			if (fwd->whoTo != net) {
				/* Nope, not the net in question */
				continue;
			}
			if (data_auth_reqd && (auth == NULL)) {
				dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
			} else
				dmtu = 0;
			if (fwd->send_size <= (mtu - dmtu)) {
				if (data_auth_reqd) {
					if (auth == NULL) {
						m = sctp_add_auth_chunk(m,
									&endofchain,
									&auth,
									&auth_offset,
									stcb,
									SCTP_DATA);
						auth_keyid = fwd->auth_keyid;
						override_ok = 0;
						SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
					} else if (override_ok) {
						auth_keyid = fwd->auth_keyid;
						override_ok = 0;
					} else if (fwd->auth_keyid != auth_keyid) {
						/* different keyid, so done bundling */
						break;
					}
				}
				m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
				if (m == NULL) {
					SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
					return (ENOMEM);
				}
				/* Do clear IP_DF ? */
				if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
					no_fragmentflg = 0;
				}
				/* update our MTU size */
				if (mtu > (fwd->send_size + dmtu))
					mtu -= (fwd->send_size + dmtu);
				else
					mtu = 0;
				data_list[bundle_at++] = fwd;
				if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
					break;
				}
			} else {
				/* can't fit so we are done */
				break;
			}
		}
	}
	/* Is there something to send for this destination? */
	if (m) {
		/*
		 * No matter if we fail/or succeed we should start a
		 * timer. A failure is like a lost IP packet :-)
		 */
		if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
			/*
			 * no timer running on this destination
			 * restart it.
			 */
			sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
			tmr_started = 1;
		}
		switch (asoc->snd_edmid) {
		case SCTP_EDMID_LOWER_LAYER_DTLS:
			use_zero_crc = true;
			break;
		default:
			use_zero_crc = false;
			break;
		}
		/* Now lets send it, if there is anything to send :> */
		if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
		                                        (struct sockaddr *)&net->ro._l_addr, m,
		                                        auth_offset, auth, auth_keyid,
		                                        no_fragmentflg, 0, 0,
		                                        inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
		                                        net->port, NULL,
#if defined(__FreeBSD__) && !defined(__Userspace__)
		                                        0, 0,
#endif
		                                        use_zero_crc,
		                                        so_locked))) {
			/* error, we could not output */
			SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
			if (error == ENOBUFS) {
				asoc->ifp_had_enobuf = 1;
				SCTP_STAT_INCR(sctps_lowlevelerr);
			}
			return (error);
		} else {
			asoc->ifp_had_enobuf = 0;
		}
		endofchain = NULL;
		auth = NULL;
		auth_offset = 0;
		/* For HB's */
		/*
		 * We don't want to mark the net->sent time here
		 * since this we use this for HB and retrans cannot
		 * measure RTT
		 */
		/* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */

		/* For auto-close */
		if (*now_filled == 0) {
			(void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
			*now = asoc->time_last_sent;
			*now_filled = 1;
		} else {
			asoc->time_last_sent = *now;
		}
		*cnt_out += bundle_at;
#ifdef SCTP_AUDITING_ENABLED
		sctp_audit_log(0xC4, bundle_at);
#endif
		if (bundle_at) {
			tsns_sent = data_list[0]->rec.data.tsn;
		}
		for (i = 0; i < bundle_at; i++) {
			SCTP_STAT_INCR(sctps_sendretransdata);
			data_list[i]->sent = SCTP_DATAGRAM_SENT;
			/*
			 * When we have a revoked data, and we
			 * retransmit it, then we clear the revoked
			 * flag since this flag dictates if we
			 * subtracted from the fs
			 */
			if (data_list[i]->rec.data.chunk_was_revoked) {
				/* Deflate the cwnd */
				data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
				data_list[i]->rec.data.chunk_was_revoked = 0;
			}
			data_list[i]->snd_count++;
			sctp_ucount_decr(asoc->sent_queue_retran_cnt);
			/* record the time */
			data_list[i]->sent_rcv_time = asoc->time_last_sent;
			if (data_list[i]->book_size_scale) {
				/*
				 * need to double the book size on
				 * this one
				 */
				data_list[i]->book_size_scale = 0;
				/* Since we double the booksize, we must
				 * also double the output queue size, since this
				 * get shrunk when we free by this amount.
				 */
				atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
				data_list[i]->book_size *= 2;
			} else {
				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
					sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
					      asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
				}
				asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
								    (uint32_t) (data_list[i]->send_size +
										SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
			}
			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
				sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
					       data_list[i]->whoTo->flight_size,
					       data_list[i]->book_size,
					       (uint32_t)(uintptr_t)data_list[i]->whoTo,
					       data_list[i]->rec.data.tsn);
			}
			sctp_flight_size_increase(data_list[i]);
			sctp_total_flight_increase(stcb, data_list[i]);
			if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
				/* SWS sender side engages */
				asoc->peers_rwnd = 0;
			}
			if ((i == 0) &&
			    (data_list[i]->rec.data.doing_fast_retransmit)) {
				SCTP_STAT_INCR(sctps_sendfastretrans);
				if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
				    (tmr_started == 0)) {
					/*-
					 * ok we just fast-retrans'd
					 * the lowest TSN, i.e the
					 * first on the list. In
					 * this case we want to give
					 * some more time to get a
					 * SACK back without a
					 * t3-expiring.
					 */
					sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
					                SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
					sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
				}
			}
		}
		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
			sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
		}
#ifdef SCTP_AUDITING_ENABLED
		sctp_auditing(21, inp, stcb, NULL);
#endif
	} else {
		/* None will fit */
		return (1);
	}
	if (asoc->sent_queue_retran_cnt <= 0) {
		/* all done we have no more to retran */
		asoc->sent_queue_retran_cnt = 0;
		break;
	}
	if (one_chunk) {
		/* No more room in rwnd */
		return (1);
	}
	/* stop the for loop here. we sent out a packet */
	break;
}
return (0);
}

static void
sctp_timer_validation(struct sctp_inpcb *inp,
   struct sctp_tcb *stcb,
   struct sctp_association *asoc)
{
struct sctp_nets *net;

/* Validate that a timer is running somewhere */
TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
	if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
		/* Here is a timer */
		return;
	}
}
SCTP_TCB_LOCK_ASSERT(stcb);
/* Gak, we did not have a timer somewhere */
SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
if (asoc->alternate) {
	sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
} else {
	sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
}
return;
}

void
sctp_chunk_output(struct sctp_inpcb *inp,
   struct sctp_tcb *stcb,
   int from_where,
   int so_locked)
{
/*-
 * Ok this is the generic chunk service queue. we must do the
 * following:
 * - See if there are retransmits pending, if so we must
 *   do these first.
 * - Service the stream queue that is next, moving any
 *   message (note I must get a complete message i.e.
 *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
 *   TSN's
 * - Check to see if the cwnd/rwnd allows any output, if so we
 *   go ahead and formulate and send the low level chunks. Making sure
 *   to combine any control in the control chunk queue also.
 */
struct sctp_association *asoc;
struct sctp_nets *net;
int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
unsigned int burst_cnt = 0;
struct timeval now;
int now_filled = 0;
int nagle_on;
uint32_t frag_point = sctp_get_frag_point(stcb);
int un_sent = 0;
int fr_done;
unsigned int tot_frs = 0;

#if defined(__APPLE__) && !defined(__Userspace__)
if (so_locked) {
	sctp_lock_assert(SCTP_INP_SO(inp));
} else {
	sctp_unlock_assert(SCTP_INP_SO(inp));
}
#endif
asoc = &stcb->asoc;
do_it_again:
/* The Nagle algorithm is only applied when handling a send call. */
if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
	if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
		nagle_on = 0;
	} else {
		nagle_on = 1;
	}
} else {
	nagle_on = 0;
}
SCTP_TCB_LOCK_ASSERT(stcb);

un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);

if ((un_sent <= 0) &&
    (TAILQ_EMPTY(&asoc->control_send_queue)) &&
    (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
    (asoc->sent_queue_retran_cnt == 0) &&
    (asoc->trigger_reset == 0)) {
	/* Nothing to do unless there is something to be sent left */
	return;
}
/* Do we have something to send, data or control AND
 * a sack timer running, if so piggy-back the sack.
 */
if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
	sctp_send_sack(stcb, so_locked);
	sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL,
	                SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
}
while (asoc->sent_queue_retran_cnt) {
	/*-
	 * Ok, it is retransmission time only, we send out only ONE
	 * packet with a single call off to the retran code.
	 */
	if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
		/*-
		 * Special hook for handling cookies discarded
		 * by peer that carried data. Send cookie-ack only
		 * and then the next call with get the retran's.
		 */
		(void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
		                            from_where,
		                            &now, &now_filled, frag_point, so_locked);
		return;
	} else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
		/* if its not from a HB then do it */
		fr_done = 0;
		ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
		if (fr_done) {
			tot_frs++;
		}
	} else {
		/*
		 * its from any other place, we don't allow retran
		 * output (only control)
		 */
		ret = 1;
	}
	if (ret > 0) {
		/* Can't send anymore */
		/*-
		 * now lets push out control by calling med-level
		 * output once. this assures that we WILL send HB's
		 * if queued too.
		 */
		(void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
		                            from_where,
		                            &now, &now_filled, frag_point, so_locked);
#ifdef SCTP_AUDITING_ENABLED
		sctp_auditing(8, inp, stcb, NULL);
#endif
		sctp_timer_validation(inp, stcb, asoc);
		return;
	}
	if (ret < 0) {
		/*-
		 * The count was off.. retran is not happening so do
		 * the normal retransmission.
		 */
#ifdef SCTP_AUDITING_ENABLED
		sctp_auditing(9, inp, stcb, NULL);
#endif
		if (ret == SCTP_RETRAN_EXIT) {
			return;
		}
		break;
	}
	if (from_where == SCTP_OUTPUT_FROM_T3) {
		/* Only one transmission allowed out of a timeout */
#ifdef SCTP_AUDITING_ENABLED
		sctp_auditing(10, inp, stcb, NULL);
#endif
		/* Push out any control */
		(void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
		                            &now, &now_filled, frag_point, so_locked);
		return;
	}
	if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
		/* Hit FR burst limit */
		return;
	}
	if ((num_out == 0) && (ret == 0)) {
		/* No more retrans to send */
		break;
	}
}
#ifdef SCTP_AUDITING_ENABLED
sctp_auditing(12, inp, stcb, NULL);
#endif
/* Check for bad destinations, if they exist move chunks around. */
TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
	if ((net->dest_state & SCTP_ADDR_REACHABLE) == 0) {
		/*-
		 * if possible move things off of this address we
		 * still may send below due to the dormant state but
		 * we try to find an alternate address to send to
		 * and if we have one we move all queued data on the
		 * out wheel to this alternate address.
		 */
		if (net->ref_count > 1)
			sctp_move_chunks_from_net(stcb, net);
	} else {
		/*-
		 * if ((asoc->sat_network) || (net->addr_is_local))
		 * { burst_limit = asoc->max_burst *
		 * SCTP_SAT_NETWORK_BURST_INCR; }
		 */
		if (asoc->max_burst > 0) {
			if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
				if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
					/* JRS - Use the congestion control given in the congestion control module */
					asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
					if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
						sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
					}
					SCTP_STAT_INCR(sctps_maxburstqueued);
				}
				net->fast_retran_ip = 0;
			} else {
				if (net->flight_size == 0) {
					/* Should be decaying the cwnd here */
					;
				}
			}
		}
	}
}
burst_cnt = 0;
do {
	error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
	                              &reason_code, 0, from_where,
	                              &now, &now_filled, frag_point, so_locked);
	if (error) {
		SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
			sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
		}
		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
			sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
			sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
		}
		break;
	}
	SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);

	tot_out += num_out;
	burst_cnt++;
	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
		sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
		if (num_out == 0) {
			sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
		}
	}
	if (nagle_on) {
		/*
		 * When the Nagle algorithm is used, look at how much
		 * is unsent, then if its smaller than an MTU and we
		 * have data in flight we stop, except if we are
		 * handling a fragmented user message.
		 */
		un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
		if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
		    (stcb->asoc.total_flight > 0)) {
/*	&&		     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {*/
			break;
		}
	}
	if (TAILQ_EMPTY(&asoc->control_send_queue) &&
	    TAILQ_EMPTY(&asoc->send_queue) &&
	    sctp_is_there_unsent_data(stcb, so_locked) == 0) {
		/* Nothing left to send */
		break;
	}
	if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
		/* Nothing left to send */
		break;
	}
} while (num_out &&
         ((asoc->max_burst == 0) ||
	  SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
	  (burst_cnt < asoc->max_burst)));

if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
	if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
		SCTP_STAT_INCR(sctps_maxburstqueued);
		asoc->burst_limit_applied = 1;
		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
			sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
		}
	} else {
		asoc->burst_limit_applied = 0;
	}
}
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
	sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
}
SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
	tot_out);

/*-
 * Now we need to clean up the control chunk chain if a ECNE is on
 * it. It must be marked as UNSENT again so next call will continue
 * to send it until such time that we get a CWR, to remove it.
 */
if (stcb->asoc.ecn_echo_cnt_onq)
	sctp_fix_ecn_echo(asoc);

if (stcb->asoc.trigger_reset) {
	if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
		goto do_it_again;
	}
}
return;
}

int
sctp_output(
struct sctp_inpcb *inp,
struct mbuf *m,
struct sockaddr *addr,
struct mbuf *control,
#if defined(__FreeBSD__) && !defined(__Userspace__)
struct thread *p,
#elif defined(_WIN32) && !defined(__Userspace__)
PKTHREAD p,
#else
#if defined(__APPLE__) && !defined(__Userspace__)
struct proc *p SCTP_UNUSED,
#else
struct proc *p,
#endif
#endif
int flags)
{
if (inp == NULL) {
	SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
	return (EINVAL);
}

if (inp->sctp_socket == NULL) {
	SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
	return (EINVAL);
}
return (sctp_sosend(inp->sctp_socket,
		    addr,
		    (struct uio *)NULL,
		    m,
		    control,
#if defined(__APPLE__) && !defined(__Userspace__)
		    flags
#else
		    flags, p
#endif
		));
}

void
send_forward_tsn(struct sctp_tcb *stcb,
	 struct sctp_association *asoc)
{
struct sctp_tmit_chunk *chk, *at, *tp1, *last;
struct sctp_forward_tsn_chunk *fwdtsn;
struct sctp_strseq *strseq;
struct sctp_strseq_mid *strseq_m;
uint32_t advance_peer_ack_point;
unsigned int cnt_of_space, i, ovh;
unsigned int space_needed;
unsigned int cnt_of_skipped = 0;

SCTP_TCB_LOCK_ASSERT(stcb);
TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
	if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
		/* mark it to unsent */
		chk->sent = SCTP_DATAGRAM_UNSENT;
		chk->snd_count = 0;
		/* Do we correct its output location? */
		if (chk->whoTo) {
			sctp_free_remote_addr(chk->whoTo);
			chk->whoTo = NULL;
		}
		goto sctp_fill_in_rest;
	}
}
/* Ok if we reach here we must build one */
sctp_alloc_a_chunk(stcb, chk);
if (chk == NULL) {
	return;
}
asoc->fwd_tsn_cnt++;
chk->copy_by_ref = 0;
/*
 * We don't do the old thing here since
 * this is used not for on-wire but to
 * tell if we are sending a fwd-tsn by
 * the stack during output. And if its
 * a IFORWARD or a FORWARD it is a fwd-tsn.
 */
chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
chk->rec.chunk_id.can_take_data = 0;
chk->flags = 0;
chk->asoc = asoc;
chk->whoTo = NULL;
chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
if (chk->data == NULL) {
	sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
	return;
}
SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
chk->sent = SCTP_DATAGRAM_UNSENT;
chk->snd_count = 0;
TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
asoc->ctrl_queue_cnt++;
sctp_fill_in_rest:
/*-
 * Here we go through and fill out the part that deals with
 * stream/seq of the ones we skip.
 */
SCTP_BUF_LEN(chk->data) = 0;
TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
	if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
	    (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
		/* no more to look at */
		break;
	}
	if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
		/* We don't report these */
		continue;
	}
	cnt_of_skipped++;
}
if (asoc->idata_supported) {
	space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
	                (cnt_of_skipped * sizeof(struct sctp_strseq_mid)));
} else {
	space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
	                (cnt_of_skipped * sizeof(struct sctp_strseq)));
}
cnt_of_space = (unsigned int)M_TRAILINGSPACE(chk->data);

if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
	ovh = SCTP_MIN_OVERHEAD;
} else {
	ovh = SCTP_MIN_V4_OVERHEAD;
}
if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
	/* trim to a mtu size */
	cnt_of_space = asoc->smallest_mtu - ovh;
}
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
	sctp_misc_ints(SCTP_FWD_TSN_CHECK,
		       0xff, 0, cnt_of_skipped,
		       asoc->advanced_peer_ack_point);
}
advance_peer_ack_point = asoc->advanced_peer_ack_point;
if (cnt_of_space < space_needed) {
	/*-
	 * ok we must trim down the chunk by lowering the
	 * advance peer ack point.
	 */
	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
		sctp_misc_ints(SCTP_FWD_TSN_CHECK,
			       0xff, 0xff, cnt_of_space,
			       space_needed);
	}
	cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
	if (asoc->idata_supported) {
		cnt_of_skipped /= sizeof(struct sctp_strseq_mid);
	} else {
		cnt_of_skipped /= sizeof(struct sctp_strseq);
	}
	/*-
	 * Go through and find the TSN that will be the one
	 * we report.
	 */
	at = TAILQ_FIRST(&asoc->sent_queue);
	if (at != NULL) {
		for (i = 0; i < cnt_of_skipped; i++) {
			tp1 = TAILQ_NEXT(at, sctp_next);
			if (tp1 == NULL) {
				break;
			}
			at = tp1;
		}
	}
	if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
		sctp_misc_ints(SCTP_FWD_TSN_CHECK,
			       0xff, cnt_of_skipped, at->rec.data.tsn,
			       asoc->advanced_peer_ack_point);
	}
	last = at;
	/*-
	 * last now points to last one I can report, update
	 * peer ack point
	 */
	if (last) {
		advance_peer_ack_point = last->rec.data.tsn;
	}
	if (asoc->idata_supported) {
		space_needed = sizeof(struct sctp_forward_tsn_chunk) +
		               cnt_of_skipped * sizeof(struct sctp_strseq_mid);
	} else {
		space_needed = sizeof(struct sctp_forward_tsn_chunk) +
		               cnt_of_skipped * sizeof(struct sctp_strseq);
	}
}
chk->send_size = space_needed;
/* Setup the chunk */
fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
fwdtsn->ch.chunk_length = htons(chk->send_size);
fwdtsn->ch.chunk_flags = 0;
if (asoc->idata_supported) {
	fwdtsn->ch.chunk_type = SCTP_IFORWARD_CUM_TSN;
} else {
	fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
}
fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
SCTP_BUF_LEN(chk->data) = chk->send_size;
fwdtsn++;
/*-
 * Move pointer to after the fwdtsn and transfer to the
 * strseq pointer.
 */
if (asoc->idata_supported) {
	strseq_m = (struct sctp_strseq_mid *)fwdtsn;
	strseq = NULL;
} else {
	strseq = (struct sctp_strseq *)fwdtsn;
	strseq_m = NULL;
}
/*-
 * Now populate the strseq list. This is done blindly
 * without pulling out duplicate stream info. This is
 * inefficient but won't harm the process since the peer will
 * look at these in sequence and will thus release anything.
 * It could mean we exceed the PMTU and chop off some that
 * we could have included.. but this is unlikely (aka 1432/4
 * would mean 300+ stream seq's would have to be reported in
 * one FWD-TSN. With a bit of work we can later FIX this to
 * optimize and pull out duplicates.. but it does add more
 * overhead. So for now... not!
 */
i = 0;
TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
	if (i >= cnt_of_skipped) {
		break;
	}
	if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
		/* We don't report these */
		continue;
	}
	if (at->rec.data.tsn == advance_peer_ack_point) {
		at->rec.data.fwd_tsn_cnt = 0;
	}
	if (asoc->idata_supported) {
		strseq_m->sid = htons(at->rec.data.sid);
		if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
			strseq_m->flags = htons(PR_SCTP_UNORDERED_FLAG);
		} else {
			strseq_m->flags = 0;
		}
		strseq_m->mid = htonl(at->rec.data.mid);
		strseq_m++;
	} else {
		strseq->sid = htons(at->rec.data.sid);
		strseq->ssn = htons((uint16_t)at->rec.data.mid);
		strseq++;
	}
	i++;
}
return;
}

void
sctp_send_sack(struct sctp_tcb *stcb, int so_locked)
{
/*-
 * Queue up a SACK or NR-SACK in the control queue.
 * We must first check to see if a SACK or NR-SACK is
 * somehow on the control queue.
 * If so, we will take and and remove the old one.
 */
struct sctp_association *asoc;
struct sctp_tmit_chunk *chk, *a_chk;
struct sctp_sack_chunk *sack;
struct sctp_nr_sack_chunk *nr_sack;
struct sctp_gap_ack_block *gap_descriptor;
const struct sack_track *selector;
int mergeable = 0;
int offset;
caddr_t limit;
uint32_t *dup;
int limit_reached = 0;
unsigned int i, siz, j;
unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
int num_dups = 0;
int space_req;
uint32_t highest_tsn;
uint8_t flags;
uint8_t type;
uint8_t tsn_map;

if (stcb->asoc.nrsack_supported == 1) {
	type = SCTP_NR_SELECTIVE_ACK;
} else {
	type = SCTP_SELECTIVE_ACK;
}
a_chk = NULL;
asoc = &stcb->asoc;
SCTP_TCB_LOCK_ASSERT(stcb);
if (asoc->last_data_chunk_from == NULL) {
	/* Hmm we never received anything */
	return;
}
sctp_slide_mapping_arrays(stcb);
sctp_set_rwnd(stcb, asoc);
TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
	if (chk->rec.chunk_id.id == type) {
		/* Hmm, found a sack already on queue, remove it */
		TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
		asoc->ctrl_queue_cnt--;
		a_chk = chk;
		if (a_chk->data) {
			sctp_m_freem(a_chk->data);
			a_chk->data = NULL;
		}
		if (a_chk->whoTo) {
			sctp_free_remote_addr(a_chk->whoTo);
			a_chk->whoTo = NULL;
		}
		break;
	}
}
if (a_chk == NULL) {
	sctp_alloc_a_chunk(stcb, a_chk);
	if (a_chk == NULL) {
		/* No memory so we drop the idea, and set a timer */
		if (stcb->asoc.delayed_ack) {
			sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
			                stcb->sctp_ep, stcb, NULL,
			                SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
			sctp_timer_start(SCTP_TIMER_TYPE_RECV,
			    stcb->sctp_ep, stcb, NULL);
		} else {
			stcb->asoc.send_sack = 1;
		}
		return;
	}
	a_chk->copy_by_ref = 0;
	a_chk->rec.chunk_id.id = type;
	a_chk->rec.chunk_id.can_take_data = 1;
}
/* Clear our pkt counts */
asoc->data_pkts_seen = 0;

a_chk->flags = 0;
a_chk->asoc = asoc;
a_chk->snd_count = 0;
a_chk->send_size = 0;	/* fill in later */
a_chk->sent = SCTP_DATAGRAM_UNSENT;
a_chk->whoTo = NULL;

if ((asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE) == 0) {
	/*-
	 * Ok, the destination for the SACK is unreachable, lets see if
	 * we can select an alternate to asoc->last_data_chunk_from
	 */
	a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
	if (a_chk->whoTo == NULL) {
		/* Nope, no alternate */
		a_chk->whoTo = asoc->last_data_chunk_from;
	}
} else {
	a_chk->whoTo = asoc->last_data_chunk_from;
}
if (a_chk->whoTo) {
	atomic_add_int(&a_chk->whoTo->ref_count, 1);
}
if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
	highest_tsn = asoc->highest_tsn_inside_map;
} else {
	highest_tsn = asoc->highest_tsn_inside_nr_map;
}
if (highest_tsn == asoc->cumulative_tsn) {
	/* no gaps */
	if (type == SCTP_SELECTIVE_ACK) {
		space_req = sizeof(struct sctp_sack_chunk);
	} else {
		space_req = sizeof(struct sctp_nr_sack_chunk);
	}
} else {
	/* gaps get a cluster */
	space_req = MCLBYTES;
}
/* Ok now lets formulate a MBUF with our sack */
a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
if ((a_chk->data == NULL) ||
    (a_chk->whoTo == NULL)) {
	/* rats, no mbuf memory */
	if (a_chk->data) {
		/* was a problem with the destination */
		sctp_m_freem(a_chk->data);
		a_chk->data = NULL;
	}
	sctp_free_a_chunk(stcb, a_chk, so_locked);
	/* sa_ignore NO_NULL_CHK */
	if (stcb->asoc.delayed_ack) {
		sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
		                stcb->sctp_ep, stcb, NULL,
		                SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
		sctp_timer_start(SCTP_TIMER_TYPE_RECV,
		    stcb->sctp_ep, stcb, NULL);
	} else {
		stcb->asoc.send_sack = 1;
	}
	return;
}
/* ok, lets go through and fill it in */
SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
space = (unsigned int)M_TRAILINGSPACE(a_chk->data);
if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
	space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
}
limit = mtod(a_chk->data, caddr_t);
limit += space;

flags = 0;

if ((asoc->sctp_cmt_on_off > 0) &&
    SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
	/*-
	 * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
	 * received, then set high bit to 1, else 0. Reset
	 * pkts_rcvd.
	 */
	flags |= (asoc->cmt_dac_pkts_rcvd << 6);
	asoc->cmt_dac_pkts_rcvd = 0;
}
#ifdef SCTP_ASOCLOG_OF_TSNS
stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
stcb->asoc.cumack_log_atsnt++;
if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
	stcb->asoc.cumack_log_atsnt = 0;
}
#endif
/* reset the readers interpretation */
stcb->freed_by_sorcv_sincelast = 0;

if (type == SCTP_SELECTIVE_ACK) {
	sack = mtod(a_chk->data, struct sctp_sack_chunk *);
	nr_sack = NULL;
	gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
	if (highest_tsn > asoc->mapping_array_base_tsn) {
		siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
	} else {
		siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + highest_tsn + 7) / 8;
	}
} else {
	sack = NULL;
	nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
	gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
	if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
		siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
	} else {
		siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
	}
}

if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
	offset = 1;
} else {
	offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
}
if (((type == SCTP_SELECTIVE_ACK) &&
     SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
    ((type == SCTP_NR_SELECTIVE_ACK) &&
     SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
	/* we have a gap .. maybe */
	for (i = 0; i < siz; i++) {
		tsn_map = asoc->mapping_array[i];
		if (type == SCTP_SELECTIVE_ACK) {
			tsn_map |= asoc->nr_mapping_array[i];
		}
		if (i == 0) {
			/*
			 * Clear all bits corresponding to TSNs
			 * smaller or equal to the cumulative TSN.
			 */
			tsn_map &= (~0U << (1 - offset));
		}
		selector = &sack_array[tsn_map];
		if (mergeable && selector->right_edge) {
			/*
			 * Backup, left and right edges were ok to
			 * merge.
			 */
			num_gap_blocks--;
			gap_descriptor--;
		}
		if (selector->num_entries == 0)
			mergeable = 0;
		else {
			for (j = 0; j < selector->num_entries; j++) {
				if (mergeable && selector->right_edge) {
					/*
					 * do a merge by NOT setting
					 * the left side
					 */
					mergeable = 0;
				} else {
					/*
					 * no merge, set the left
					 * side
					 */
					mergeable = 0;
					gap_descriptor->start = htons((selector->gaps[j].start + offset));
				}
				gap_descriptor->end = htons((selector->gaps[j].end + offset));
				num_gap_blocks++;
				gap_descriptor++;
				if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
					/* no more room */
					limit_reached = 1;
					break;
				}
			}
			if (selector->left_edge) {
				mergeable = 1;
			}
		}
		if (limit_reached) {
			/* Reached the limit stop */
			break;
		}
		offset += 8;
	}
}
if ((type == SCTP_NR_SELECTIVE_ACK) &&
    (limit_reached == 0)) {
	mergeable = 0;

	if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
		siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
	} else {
		siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
	}

	if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
		offset = 1;
	} else {
		offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
	}
	if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
		/* we have a gap .. maybe */
		for (i = 0; i < siz; i++) {
			tsn_map = asoc->nr_mapping_array[i];
			if (i == 0) {
				/*
				 * Clear all bits corresponding to TSNs
				 * smaller or equal to the cumulative TSN.
				 */
				tsn_map &= (~0U << (1 - offset));
			}
			selector = &sack_array[tsn_map];
			if (mergeable && selector->right_edge) {
				/*
				* Backup, left and right edges were ok to
				* merge.
				*/
				num_nr_gap_blocks--;
				gap_descriptor--;
			}
			if (selector->num_entries == 0)
				mergeable = 0;
			else {
				for (j = 0; j < selector->num_entries; j++) {
					if (mergeable && selector->right_edge) {
						/*
						* do a merge by NOT setting
						* the left side
						*/
						mergeable = 0;
					} else {
						/*
						* no merge, set the left
						* side
						*/
						mergeable = 0;
						gap_descriptor->start = htons((selector->gaps[j].start + offset));
					}
					gap_descriptor->end = htons((selector->gaps[j].end + offset));
					num_nr_gap_blocks++;
					gap_descriptor++;
					if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
						/* no more room */
						limit_reached = 1;
						break;
					}
				}
				if (selector->left_edge) {
					mergeable = 1;
				}
			}
			if (limit_reached) {
				/* Reached the limit stop */
				break;
			}
			offset += 8;
		}
	}
}
/* now we must add any dups we are going to report. */
if ((limit_reached == 0) && (asoc->numduptsns)) {
	dup = (uint32_t *) gap_descriptor;
	for (i = 0; i < asoc->numduptsns; i++) {
		*dup = htonl(asoc->dup_tsns[i]);
		dup++;
		num_dups++;
		if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
			/* no more room */
			break;
		}
	}
	asoc->numduptsns = 0;
}
/*
 * now that the chunk is prepared queue it to the control chunk
 * queue.
 */
if (type == SCTP_SELECTIVE_ACK) {
	a_chk->send_size = (uint16_t)(sizeof(struct sctp_sack_chunk) +
	                              (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
	                              num_dups * sizeof(int32_t));
	SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
	sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
	sack->sack.a_rwnd = htonl(asoc->my_rwnd);
	sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
	sack->sack.num_dup_tsns = htons(num_dups);
	sack->ch.chunk_type = type;
	sack->ch.chunk_flags = flags;
	sack->ch.chunk_length = htons(a_chk->send_size);
} else {
	a_chk->send_size = (uint16_t)(sizeof(struct sctp_nr_sack_chunk) +
	                              (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
	                              num_dups * sizeof(int32_t));
	SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
	nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
	nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
	nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
	nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
	nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
	nr_sack->nr_sack.reserved = 0;
	nr_sack->ch.chunk_type = type;
	nr_sack->ch.chunk_flags = flags;
	nr_sack->ch.chunk_length = htons(a_chk->send_size);
}
TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
asoc->my_last_reported_rwnd = asoc->my_rwnd;
asoc->ctrl_queue_cnt++;
asoc->send_sack = 0;
SCTP_STAT_INCR(sctps_sendsacks);
return;
}

void
sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked)
{
struct mbuf *m_abort, *m, *m_last;
struct mbuf *m_out, *m_end = NULL;
struct sctp_abort_chunk *abort;
struct sctp_auth_chunk *auth = NULL;
struct sctp_nets *net;
uint32_t vtag;
uint32_t auth_offset = 0;
int error;
uint16_t cause_len, chunk_len, padding_len;
bool use_zero_crc;

#if defined(__APPLE__) && !defined(__Userspace__)
if (so_locked) {
	sctp_lock_assert(SCTP_INP_SO(stcb->sctp_ep));
} else {
	sctp_unlock_assert(SCTP_INP_SO(stcb->sctp_ep));
}
#endif
SCTP_TCB_LOCK_ASSERT(stcb);
/*-
 * Add an AUTH chunk, if chunk requires it and save the offset into
 * the chain for AUTH
 */
if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
                                stcb->asoc.peer_auth_chunks)) {
	m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
				    stcb, SCTP_ABORT_ASSOCIATION);
	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
} else {
	m_out = NULL;
}
switch (stcb->asoc.snd_edmid) {
case SCTP_EDMID_LOWER_LAYER_DTLS:
	use_zero_crc = true;
	break;
default:
	use_zero_crc = false;
	break;
}
m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
if (m_abort == NULL) {
	if (m_out) {
		sctp_m_freem(m_out);
	}
	if (operr) {
		sctp_m_freem(operr);
	}
	return;
}
/* link in any error */
SCTP_BUF_NEXT(m_abort) = operr;
cause_len = 0;
m_last = NULL;
for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
	cause_len += (uint16_t)SCTP_BUF_LEN(m);
	if (SCTP_BUF_NEXT(m) == NULL) {
		m_last = m;
	}
}
SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
chunk_len = (uint16_t)sizeof(struct sctp_abort_chunk) + cause_len;
padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
if (m_out == NULL) {
	/* NO Auth chunk prepended, so reserve space in front */
	SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
	m_out = m_abort;
} else {
	/* Put AUTH chunk at the front of the chain */
	SCTP_BUF_NEXT(m_end) = m_abort;
}
if (stcb->asoc.alternate) {
	net = stcb->asoc.alternate;
} else {
	net = stcb->asoc.primary_destination;
}
/* Fill in the ABORT chunk header. */
abort = mtod(m_abort, struct sctp_abort_chunk *);
abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
if (stcb->asoc.peer_vtag == 0) {
	/* This happens iff the assoc is in COOKIE-WAIT state. */
	vtag = stcb->asoc.my_vtag;
	abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
} else {
	vtag = stcb->asoc.peer_vtag;
	abort->ch.chunk_flags = 0;
}
abort->ch.chunk_length = htons(chunk_len);
/* Add padding, if necessary. */
if (padding_len > 0) {
	if ((m_last == NULL) ||
	    (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
		sctp_m_freem(m_out);
		return;
	}
}
if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
                                        (struct sockaddr *)&net->ro._l_addr,
                                        m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
                                        stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
                                        stcb->asoc.primary_destination->port, NULL,
#if defined(__FreeBSD__) && !defined(__Userspace__)
                                        0, 0,
#endif
                                        use_zero_crc,
                                        so_locked))) {
	SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
	if (error == ENOBUFS) {
		stcb->asoc.ifp_had_enobuf = 1;
		SCTP_STAT_INCR(sctps_lowlevelerr);
	}
} else {
	stcb->asoc.ifp_had_enobuf = 0;
}
SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
}

void
sctp_send_shutdown_complete(struct sctp_tcb *stcb,
                           struct sctp_nets *net,
                           int reflect_vtag)
{
/* formulate and SEND a SHUTDOWN-COMPLETE */
struct mbuf *m_shutdown_comp;
struct sctp_shutdown_complete_chunk *shutdown_complete;
uint32_t vtag;
int error;
uint8_t flags;
bool use_zero_crc;

m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
if (m_shutdown_comp == NULL) {
	/* no mbuf's */
	return;
}
if (reflect_vtag) {
	flags = SCTP_HAD_NO_TCB;
	vtag = stcb->asoc.my_vtag;
} else {
	flags = 0;
	vtag = stcb->asoc.peer_vtag;
}
switch (stcb->asoc.snd_edmid) {
case SCTP_EDMID_LOWER_LAYER_DTLS:
	use_zero_crc = true;
	break;
default:
	use_zero_crc = false;
	break;
}
shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
shutdown_complete->ch.chunk_flags = flags;
shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
                                        (struct sockaddr *)&net->ro._l_addr,
                                        m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
                                        stcb->sctp_ep->sctp_lport, stcb->rport,
                                        htonl(vtag),
                                        net->port, NULL,
#if defined(__FreeBSD__) && !defined(__Userspace__)
                                        0, 0,
#endif
                                        use_zero_crc,
                                        SCTP_SO_NOT_LOCKED))) {
	SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
	if (error == ENOBUFS) {
		stcb->asoc.ifp_had_enobuf = 1;
		SCTP_STAT_INCR(sctps_lowlevelerr);
	}
} else {
	stcb->asoc.ifp_had_enobuf = 0;
}
SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
return;
}

#if defined(__FreeBSD__) && !defined(__Userspace__)
static void
sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
                  struct sctphdr *sh, uint32_t vtag,
                  uint8_t type, struct mbuf *cause,
                  uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
                  uint32_t vrf_id, uint16_t port)
#else
static void
sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
                  struct sctphdr *sh, uint32_t vtag,
                  uint8_t type, struct mbuf *cause,
                  uint32_t vrf_id SCTP_UNUSED, uint16_t port)
#endif
{
struct mbuf *o_pak;
struct mbuf *mout;
struct sctphdr *shout;
struct sctp_chunkhdr *ch;
#if defined(INET) || defined(INET6)
struct udphdr *udp;
#endif
int ret, len, cause_len, padding_len;
#ifdef INET
#if defined(__APPLE__) && !defined(__Userspace__)
sctp_route_t ro;
#endif
struct sockaddr_in *src_sin, *dst_sin;
struct ip *ip;
#endif
#ifdef INET6
struct sockaddr_in6 *src_sin6, *dst_sin6;
struct ip6_hdr *ip6;
#endif

/* Compute the length of the cause and add final padding. */
cause_len = 0;
if (cause != NULL) {
	struct mbuf *m_at, *m_last = NULL;

	for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
		if (SCTP_BUF_NEXT(m_at) == NULL)
			m_last = m_at;
		cause_len += SCTP_BUF_LEN(m_at);
	}
	padding_len = cause_len % 4;
	if (padding_len != 0) {
		padding_len = 4 - padding_len;
	}
	if (padding_len != 0) {
		if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
			sctp_m_freem(cause);
			return;
		}
	}
} else {
	padding_len = 0;
}
/* Get an mbuf for the header. */
len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
switch (dst->sa_family) {
#ifdef INET
case AF_INET:
	len += sizeof(struct ip);
	break;
#endif
#ifdef INET6
case AF_INET6:
	len += sizeof(struct ip6_hdr);
	break;
#endif
default:
	break;
}
#if defined(INET) || defined(INET6)
if (port) {
	len += sizeof(struct udphdr);
}
#endif
#if defined(__APPLE__) && !defined(__Userspace__)
#if defined(APPLE_LEOPARD) || defined(APPLE_SNOWLEOPARD)
mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
#else
mout = sctp_get_mbuf_for_msg(len + SCTP_MAX_LINKHDR, 1, M_NOWAIT, 1, MT_DATA);
#endif
#else
mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
#endif
if (mout == NULL) {
	if (cause) {
		sctp_m_freem(cause);
	}
	return;
}
#if defined(__APPLE__) && !defined(__Userspace__)
#if defined(APPLE_LEOPARD) || defined(APPLE_SNOWLEOPARD)
SCTP_BUF_RESV_UF(mout, max_linkhdr);
#else
SCTP_BUF_RESV_UF(mout, SCTP_MAX_LINKHDR);
#endif
#else
SCTP_BUF_RESV_UF(mout, max_linkhdr);
#endif
SCTP_BUF_LEN(mout) = len;
SCTP_BUF_NEXT(mout) = cause;
#if defined(__FreeBSD__) && !defined(__Userspace__)
M_SETFIB(mout, fibnum);
mout->m_pkthdr.flowid = mflowid;
M_HASHTYPE_SET(mout, mflowtype);
#endif
#ifdef INET
ip = NULL;
#endif
#ifdef INET6
ip6 = NULL;
#endif
switch (dst->sa_family) {
#ifdef INET
case AF_INET:
	src_sin = (struct sockaddr_in *)src;
	dst_sin = (struct sockaddr_in *)dst;
	ip = mtod(mout, struct ip *);
	ip->ip_v = IPVERSION;
	ip->ip_hl = (sizeof(struct ip) >> 2);
	ip->ip_tos = 0;
#if defined(__FreeBSD__) && !defined(__Userspace__)
	ip->ip_off = htons(IP_DF);
#elif defined(WITH_CONVERT_IP_OFF) || defined(__APPLE__)
	ip->ip_off = IP_DF;
#else
	ip->ip_off = htons(IP_DF);
#endif
#if defined(__Userspace__)
	ip->ip_id = htons(ip_id++);
#elif defined(__FreeBSD__)
	ip_fillid(ip);
#elif defined(__APPLE__)
#if RANDOM_IP_ID
	ip->ip_id = ip_randomid();
#else
	ip->ip_id = htons(ip_id++);
#endif
#else
	ip->ip_id = ip_id++;
#endif
	ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
	if (port) {
		ip->ip_p = IPPROTO_UDP;
	} else {
		ip->ip_p = IPPROTO_SCTP;
	}
	ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
	ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
	ip->ip_sum = 0;
	len = sizeof(struct ip);
	shout = (struct sctphdr *)((caddr_t)ip + len);
	break;
#endif
#ifdef INET6
case AF_INET6:
	src_sin6 = (struct sockaddr_in6 *)src;
	dst_sin6 = (struct sockaddr_in6 *)dst;
	ip6 = mtod(mout, struct ip6_hdr *);
	ip6->ip6_flow = htonl(0x60000000);
#if defined(__FreeBSD__) && !defined(__Userspace__)
	if (V_ip6_auto_flowlabel) {
		ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
	}
#endif
#if defined(__Userspace__)
	ip6->ip6_hlim = IPv6_HOP_LIMIT;
#else
	ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
#endif
	if (port) {
		ip6->ip6_nxt = IPPROTO_UDP;
	} else {
		ip6->ip6_nxt = IPPROTO_SCTP;
	}
	ip6->ip6_src = dst_sin6->sin6_addr;
	ip6->ip6_dst = src_sin6->sin6_addr;
	len = sizeof(struct ip6_hdr);
	shout = (struct sctphdr *)((caddr_t)ip6 + len);
	break;
#endif
default:
	len = 0;
	shout = mtod(mout, struct sctphdr *);
	break;
}
#if defined(INET) || defined(INET6)
if (port) {
	if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
		sctp_m_freem(mout);
		return;
	}
	udp = (struct udphdr *)shout;
	udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
	udp->uh_dport = port;
	udp->uh_sum = 0;
	udp->uh_ulen = htons((uint16_t)(sizeof(struct udphdr) +
	                                sizeof(struct sctphdr) +
	                                sizeof(struct sctp_chunkhdr) +
	                                cause_len + padding_len));
	len += sizeof(struct udphdr);
	shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
} else {
	udp = NULL;
}
#endif
shout->src_port = sh->dest_port;
shout->dest_port = sh->src_port;
shout->checksum = 0;
if (vtag) {
	shout->v_tag = htonl(vtag);
} else {
	shout->v_tag = sh->v_tag;
}
len += sizeof(struct sctphdr);
ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
ch->chunk_type = type;
if (vtag) {
	ch->chunk_flags = 0;
} else {
	ch->chunk_flags = SCTP_HAD_NO_TCB;
}
ch->chunk_length = htons((uint16_t)(sizeof(struct sctp_chunkhdr) + cause_len));
len += sizeof(struct sctp_chunkhdr);
len += cause_len + padding_len;

if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
	sctp_m_freem(mout);
	return;
}
SCTP_ATTACH_CHAIN(o_pak, mout, len);
switch (dst->sa_family) {
#ifdef INET
case AF_INET:
#if defined(__APPLE__) && !defined(__Userspace__)
	/* zap the stack pointer to the route */
	memset(&ro, 0, sizeof(sctp_route_t));
#endif
	if (port) {
#if !defined(_WIN32) && !defined(__Userspace__)
#if defined(__FreeBSD__)
		if (V_udp_cksum) {
			udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
		} else {
			udp->uh_sum = 0;
		}
#else
		udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
#endif
#else
		udp->uh_sum = 0;
#endif
	}
#if defined(__FreeBSD__) && !defined(__Userspace__)
	ip->ip_len = htons(len);
#elif defined(__APPLE__) || defined(__Userspace__)
	ip->ip_len = len;
#else
	ip->ip_len = htons(len);
#endif
	if (port) {
		shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
		SCTP_STAT_INCR(sctps_sendswcrc);
#if !defined(_WIN32) && !defined(__Userspace__)
#if defined(__FreeBSD__)
		if (V_udp_cksum) {
			SCTP_ENABLE_UDP_CSUM(o_pak);
		}
#else
		SCTP_ENABLE_UDP_CSUM(o_pak);
#endif
#endif
	} else {
#if defined(__FreeBSD__) && !defined(__Userspace__)
		mout->m_pkthdr.csum_flags = CSUM_SCTP;
		mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
		SCTP_STAT_INCR(sctps_sendhwcrc);
#else
		shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip));
		SCTP_STAT_INCR(sctps_sendswcrc);
#endif
	}
#ifdef SCTP_PACKET_LOGGING
	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
		sctp_packet_log(o_pak);
	}
#endif
#if defined(__APPLE__) && !defined(__Userspace__)
	SCTP_IP_OUTPUT(ret, o_pak, &ro, NULL, vrf_id);
	/* Free the route if we got one back */
	if (ro.ro_rt) {
		RTFREE(ro.ro_rt);
		ro.ro_rt = NULL;
	}
#else
#if defined(__FreeBSD__) && !defined(__Userspace__)
	SCTP_PROBE5(send, NULL, NULL, ip, NULL, shout);
#endif
	SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
#endif
	break;
#endif
#ifdef INET6
case AF_INET6:
	ip6->ip6_plen = htons((uint16_t)(len - sizeof(struct ip6_hdr)));
	if (port) {
		shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
		SCTP_STAT_INCR(sctps_sendswcrc);
#if !defined(__Userspace__)
#if defined(_WIN32)
		udp->uh_sum = 0;
#else
		if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
			udp->uh_sum = 0xffff;
		}
#endif
#endif
	} else {
#if defined(__FreeBSD__) && !defined(__Userspace__)
		mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
		mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
		SCTP_STAT_INCR(sctps_sendhwcrc);
#else
		shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr));
		SCTP_STAT_INCR(sctps_sendswcrc);
#endif
	}
#ifdef SCTP_PACKET_LOGGING
	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
		sctp_packet_log(o_pak);
	}
#endif
#if defined(__FreeBSD__) && !defined(__Userspace__)
	SCTP_PROBE5(send, NULL, NULL, ip6, NULL, shout);
#endif
	SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
	break;
#endif
#if defined(__Userspace__)
case AF_CONN:
{
	char *buffer;
	struct sockaddr_conn *sconn;

	sconn = (struct sockaddr_conn *)src;
	if (SCTP_BASE_VAR(crc32c_offloaded) == 0) {
		shout->checksum = sctp_calculate_cksum(o_pak, 0);
		SCTP_STAT_INCR(sctps_sendswcrc);
	} else {
		SCTP_STAT_INCR(sctps_sendhwcrc);
	}
#ifdef SCTP_PACKET_LOGGING
	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
		sctp_packet_log(mout);
	}
#endif
	/* Don't alloc/free for each packet */
	if ((buffer = malloc(len)) != NULL) {
		m_copydata(o_pak, 0, len, buffer);
		ret = SCTP_BASE_VAR(conn_output)(sconn->sconn_addr, buffer, len, 0, 0);
		free(buffer);
	} else {
		ret = ENOMEM;
	}
	sctp_m_freem(o_pak);
	break;
}
#endif
default:
	SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
	        dst->sa_family);
	sctp_m_freem(mout);
	SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
	return;
}
SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
#if defined(__FreeBSD__) && !defined(__Userspace__)
if (port) {
	UDPSTAT_INC(udps_opackets);
}
#endif
SCTP_STAT_INCR(sctps_sendpackets);
SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
if (ret) {
	SCTP_STAT_INCR(sctps_senderrors);
}
return;
}

void
sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
                            struct sctphdr *sh,
#if defined(__FreeBSD__) && !defined(__Userspace__)
                            uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
#endif
                            uint32_t vrf_id, uint16_t port)
{
sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
#if defined(__FreeBSD__) && !defined(__Userspace__)
                   mflowtype, mflowid, fibnum,
#endif
                   vrf_id, port);
}

void
sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net,int so_locked)
{
struct sctp_tmit_chunk *chk;
struct sctp_heartbeat_chunk *hb;
struct timeval now;

SCTP_TCB_LOCK_ASSERT(stcb);
if (net == NULL) {
	return;
}
(void)SCTP_GETTIME_TIMEVAL(&now);
switch (net->ro._l_addr.sa.sa_family) {
#ifdef INET
case AF_INET:
	break;
#endif
#ifdef INET6
case AF_INET6:
	break;
#endif
#if defined(__Userspace__)
case AF_CONN:
	break;
#endif
default:
	return;
}
sctp_alloc_a_chunk(stcb, chk);
if (chk == NULL) {
	SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
	return;
}

chk->copy_by_ref = 0;
chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
chk->rec.chunk_id.can_take_data = 1;
chk->flags = 0;
chk->asoc = &stcb->asoc;
chk->send_size = sizeof(struct sctp_heartbeat_chunk);

chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
if (chk->data == NULL) {
	sctp_free_a_chunk(stcb, chk, so_locked);
	return;
}
SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
SCTP_BUF_LEN(chk->data) = chk->send_size;
chk->sent = SCTP_DATAGRAM_UNSENT;
chk->snd_count = 0;
chk->whoTo = net;
atomic_add_int(&chk->whoTo->ref_count, 1);
/* Now we have a mbuf that we can fill in with the details */
hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
/* fill out chunk header */
hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
hb->ch.chunk_flags = 0;
hb->ch.chunk_length = htons(chk->send_size);
/* Fill out hb parameter */
hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
/* Did our user request this one, put it in */
hb->heartbeat.hb_info.addr_family = (uint8_t)net->ro._l_addr.sa.sa_family;
#ifdef HAVE_SA_LEN
hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
#else
switch (net->ro._l_addr.sa.sa_family) {
#ifdef INET
case AF_INET:
	hb->heartbeat.hb_info.addr_len = sizeof(struct sockaddr_in);
	break;
#endif
#ifdef INET6
case AF_INET6:
	hb->heartbeat.hb_info.addr_len = sizeof(struct sockaddr_in6);
	break;
#endif
#if defined(__Userspace__)
case AF_CONN:
	hb->heartbeat.hb_info.addr_len = sizeof(struct sockaddr_conn);
	break;
#endif
default:
	hb->heartbeat.hb_info.addr_len = 0;
	break;
}
#endif
if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
	/*
	 * we only take from the entropy pool if the address is not
	 * confirmed.
	 */
	net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
	net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
} else {
	net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
	net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
}
switch (net->ro._l_addr.sa.sa_family) {
#ifdef INET
case AF_INET:
	memcpy(hb->heartbeat.hb_info.address,
	       &net->ro._l_addr.sin.sin_addr,
	       sizeof(net->ro._l_addr.sin.sin_addr));
	break;
#endif
#ifdef INET6
case AF_INET6:
	memcpy(hb->heartbeat.hb_info.address,
	       &net->ro._l_addr.sin6.sin6_addr,
	       sizeof(net->ro._l_addr.sin6.sin6_addr));
	break;
#endif
#if defined(__Userspace__)
case AF_CONN:
	memcpy(hb->heartbeat.hb_info.address,
	       &net->ro._l_addr.sconn.sconn_addr,
	       sizeof(net->ro._l_addr.sconn.sconn_addr));
	break;
#endif
default:
	if (chk->data) {
		sctp_m_freem(chk->data);
		chk->data = NULL;
	}
	sctp_free_a_chunk(stcb, chk, so_locked);
	return;
	break;
}
net->hb_responded = 0;
TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
stcb->asoc.ctrl_queue_cnt++;
SCTP_STAT_INCR(sctps_sendheartbeat);
return;
}

void
sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
	   uint32_t high_tsn)
{
struct sctp_association *asoc;
struct sctp_ecne_chunk *ecne;
struct sctp_tmit_chunk *chk;

if (net == NULL) {
	return;
}
asoc = &stcb->asoc;
SCTP_TCB_LOCK_ASSERT(stcb);
TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
	if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
		/* found a previous ECN_ECHO update it if needed */
		uint32_t cnt, ctsn;
		ecne = mtod(chk->data, struct sctp_ecne_chunk *);
		ctsn = ntohl(ecne->tsn);
		if (SCTP_TSN_GT(high_tsn, ctsn)) {
			ecne->tsn = htonl(high_tsn);
			SCTP_STAT_INCR(sctps_queue_upd_ecne);
		}
		cnt = ntohl(ecne->num_pkts_since_cwr);
		cnt++;
		ecne->num_pkts_since_cwr = htonl(cnt);
		return;
	}
}
/* nope could not find one to update so we must build one */
sctp_alloc_a_chunk(stcb, chk);
if (chk == NULL) {
	return;
}
SCTP_STAT_INCR(sctps_queue_upd_ecne);
chk->copy_by_ref = 0;
chk->rec.chunk_id.id = SCTP_ECN_ECHO;
chk->rec.chunk_id.can_take_data = 0;
chk->flags = 0;
chk->asoc = &stcb->asoc;
chk->send_size = sizeof(struct sctp_ecne_chunk);
chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
if (chk->data == NULL) {
	sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
	return;
}
SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
SCTP_BUF_LEN(chk->data) = chk->send_size;
chk->sent = SCTP_DATAGRAM_UNSENT;
chk->snd_count = 0;
chk->whoTo = net;
atomic_add_int(&chk->whoTo->ref_count, 1);

stcb->asoc.ecn_echo_cnt_onq++;
ecne = mtod(chk->data, struct sctp_ecne_chunk *);
ecne->ch.chunk_type = SCTP_ECN_ECHO;
ecne->ch.chunk_flags = 0;
ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
ecne->tsn = htonl(high_tsn);
ecne->num_pkts_since_cwr = htonl(1);
TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
asoc->ctrl_queue_cnt++;
}

void
sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
   struct mbuf *m, int len, int iphlen, int bad_crc)
{
struct sctp_association *asoc;
struct sctp_pktdrop_chunk *drp;
struct sctp_tmit_chunk *chk;
uint8_t *datap;
int was_trunc = 0;
int fullsz = 0;
long spc;
int offset;
struct sctp_chunkhdr *ch, chunk_buf;
unsigned int chk_length;

       if (!stcb) {
           return;
       }
asoc = &stcb->asoc;
SCTP_TCB_LOCK_ASSERT(stcb);
if (asoc->pktdrop_supported == 0) {
	/*-
	 * peer must declare support before I send one.
	 */
	return;
}
if (stcb->sctp_socket == NULL) {
	return;
}
sctp_alloc_a_chunk(stcb, chk);
if (chk == NULL) {
	return;
}
chk->copy_by_ref = 0;
chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
chk->rec.chunk_id.can_take_data = 1;
chk->flags = 0;
len -= iphlen;
chk->send_size = len;
/* Validate that we do not have an ABORT in here. */
offset = iphlen + sizeof(struct sctphdr);
ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
					   sizeof(*ch), (uint8_t *) & chunk_buf);
while (ch != NULL) {
	chk_length = ntohs(ch->chunk_length);
	if (chk_length < sizeof(*ch)) {
		/* break to abort land */
		break;
	}
	switch (ch->chunk_type) {
	case SCTP_PACKET_DROPPED:
	case SCTP_ABORT_ASSOCIATION:
	case SCTP_INITIATION_ACK:
		/**
		 * We don't respond with an PKT-DROP to an ABORT
		 * or PKT-DROP. We also do not respond to an
		 * INIT-ACK, because we can't know if the initiation
		 * tag is correct or not.
		 */
		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
		return;
	default:
		break;
	}
	offset += SCTP_SIZE32(chk_length);
	ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
	    sizeof(*ch), (uint8_t *) & chunk_buf);
}

if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
    min(stcb->asoc.smallest_mtu, MCLBYTES)) {
	/* only send 1 mtu worth, trim off the
	 * excess on the end.
	 */
	fullsz = len;
	len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
	was_trunc = 1;
}
chk->asoc = &stcb->asoc;
chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
if (chk->data == NULL) {
jump_out:
	sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
	return;
}
SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
if (drp == NULL) {
	sctp_m_freem(chk->data);
	chk->data = NULL;
	goto jump_out;
}
chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
    sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
chk->book_size_scale = 0;
if (was_trunc) {
	drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
	drp->trunc_len = htons(fullsz);
	/* Len is already adjusted to size minus overhead above
	 * take out the pkt_drop chunk itself from it.
	 */
	chk->send_size = (uint16_t)(len - sizeof(struct sctp_pktdrop_chunk));
	len = chk->send_size;
} else {
	/* no truncation needed */
	drp->ch.chunk_flags = 0;
	drp->trunc_len = htons(0);
}
if (bad_crc) {
	drp->ch.chunk_flags |= SCTP_BADCRC;
}
chk->send_size += sizeof(struct sctp_pktdrop_chunk);
SCTP_BUF_LEN(chk->data) = chk->send_size;
chk->sent = SCTP_DATAGRAM_UNSENT;
chk->snd_count = 0;
if (net) {
	/* we should hit here */
	chk->whoTo = net;
	atomic_add_int(&chk->whoTo->ref_count, 1);
} else {
	chk->whoTo = NULL;
}
drp->ch.chunk_type = SCTP_PACKET_DROPPED;
drp->ch.chunk_length = htons(chk->send_size);
spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
if (spc < 0) {
	spc = 0;
}
drp->bottle_bw = htonl(spc);
if (asoc->my_rwnd) {
	drp->current_onq = htonl(asoc->size_on_reasm_queue +
	    asoc->size_on_all_streams +
	    asoc->my_rwnd_control_len +
	    SCTP_SBAVAIL(&stcb->sctp_socket->so_rcv));
} else {
	/*-
	 * If my rwnd is 0, possibly from mbuf depletion as well as
	 * space used, tell the peer there is NO space aka onq == bw
	 */
	drp->current_onq = htonl(spc);
}
drp->reserved = 0;
datap = drp->data;
m_copydata(m, iphlen, len, (caddr_t)datap);
TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
asoc->ctrl_queue_cnt++;
}

void
sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
{
struct sctp_association *asoc;
struct sctp_cwr_chunk *cwr;
struct sctp_tmit_chunk *chk;

SCTP_TCB_LOCK_ASSERT(stcb);
if (net == NULL) {
	return;
}
asoc = &stcb->asoc;
TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
	if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
		/* found a previous CWR queued to same destination update it if needed */
		uint32_t ctsn;
		cwr = mtod(chk->data, struct sctp_cwr_chunk *);
		ctsn = ntohl(cwr->tsn);
		if (SCTP_TSN_GT(high_tsn, ctsn)) {
			cwr->tsn = htonl(high_tsn);
		}
		if (override & SCTP_CWR_REDUCE_OVERRIDE) {
			/* Make sure override is carried */
			cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
		}
		return;
	}
}
sctp_alloc_a_chunk(stcb, chk);
if (chk == NULL) {
	return;
}
chk->copy_by_ref = 0;
chk->rec.chunk_id.id = SCTP_ECN_CWR;
chk->rec.chunk_id.can_take_data = 1;
chk->flags = 0;
chk->asoc = asoc;
chk->send_size = sizeof(struct sctp_cwr_chunk);
chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
if (chk->data == NULL) {
	sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
	return;
}
SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
SCTP_BUF_LEN(chk->data) = chk->send_size;
chk->sent = SCTP_DATAGRAM_UNSENT;
chk->snd_count = 0;
chk->whoTo = net;
atomic_add_int(&chk->whoTo->ref_count, 1);
cwr = mtod(chk->data, struct sctp_cwr_chunk *);
cwr->ch.chunk_type = SCTP_ECN_CWR;
cwr->ch.chunk_flags = override;
cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
cwr->tsn = htonl(high_tsn);
TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
asoc->ctrl_queue_cnt++;
}

static int
sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
                         uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
{
uint16_t len, old_len, i;
struct sctp_stream_reset_out_request *req_out;
struct sctp_chunkhdr *ch;
int at;
int number_entries=0;

ch = mtod(chk->data, struct sctp_chunkhdr *);
old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
/* get to new offset for the param. */
req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
/* now how long will this param be? */
for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
	if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
	    (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
	    TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
		number_entries++;
	}
}
if (number_entries == 0) {
	return (0);
}
if (number_entries == stcb->asoc.streamoutcnt) {
	number_entries = 0;
}
if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
	number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
}
len = (uint16_t)(sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
req_out->ph.param_length = htons(len);
req_out->request_seq = htonl(seq);
req_out->response_seq = htonl(resp_seq);
req_out->send_reset_at_tsn = htonl(last_sent);
at = 0;
if (number_entries) {
	for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
		if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
		    (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
		    TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
			req_out->list_of_streams[at] = htons(i);
			at++;
			stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
			if (at >= number_entries) {
				break;
			}
		}
	}
} else {
	for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
		stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
	}
}
if (SCTP_SIZE32(len) > len) {
	/*-
	 * Need to worry about the pad we may end up adding to the
	 * end. This is easy since the struct is either aligned to 4
	 * bytes or 2 bytes off.
	 */
	req_out->list_of_streams[number_entries] = 0;
}
/* now fix the chunk length */
ch->chunk_length = htons(len + old_len);
chk->book_size = len + old_len;
chk->book_size_scale = 0;
chk->send_size = SCTP_SIZE32(chk->book_size);
SCTP_BUF_LEN(chk->data) = chk->send_size;
return (1);
}

static void
sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
                        int number_entries, uint16_t *list,
                        uint32_t seq)
{
uint16_t len, old_len, i;
struct sctp_stream_reset_in_request *req_in;
struct sctp_chunkhdr *ch;

ch = mtod(chk->data, struct sctp_chunkhdr *);
old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));

/* get to new offset for the param. */
req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
/* now how long will this param be? */
len = (uint16_t)(sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
req_in->ph.param_length = htons(len);
req_in->request_seq = htonl(seq);
if (number_entries) {
	for (i = 0; i < number_entries; i++) {
		req_in->list_of_streams[i] = htons(list[i]);
	}
}
if (SCTP_SIZE32(len) > len) {
	/*-
	 * Need to worry about the pad we may end up adding to the
	 * end. This is easy since the struct is either aligned to 4
	 * bytes or 2 bytes off.
	 */
	req_in->list_of_streams[number_entries] = 0;
}
/* now fix the chunk length */
ch->chunk_length = htons(len + old_len);
chk->book_size = len + old_len;
chk->book_size_scale = 0;
chk->send_size = SCTP_SIZE32(chk->book_size);
SCTP_BUF_LEN(chk->data) = chk->send_size;
return;
}

static void
sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
                         uint32_t seq)
{
uint16_t len, old_len;
struct sctp_stream_reset_tsn_request *req_tsn;
struct sctp_chunkhdr *ch;

ch = mtod(chk->data, struct sctp_chunkhdr *);
old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));

/* get to new offset for the param. */
req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
/* now how long will this param be? */
len = sizeof(struct sctp_stream_reset_tsn_request);
req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
req_tsn->ph.param_length = htons(len);
req_tsn->request_seq = htonl(seq);

/* now fix the chunk length */
ch->chunk_length = htons(len + old_len);
chk->send_size = len + old_len;
chk->book_size = SCTP_SIZE32(chk->send_size);
chk->book_size_scale = 0;
SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
return;
}

void
sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
                            uint32_t resp_seq, uint32_t result)
{
uint16_t len, old_len;
struct sctp_stream_reset_response *resp;
struct sctp_chunkhdr *ch;

ch = mtod(chk->data, struct sctp_chunkhdr *);
old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));

/* get to new offset for the param. */
resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
/* now how long will this param be? */
len = sizeof(struct sctp_stream_reset_response);
resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
resp->ph.param_length = htons(len);
resp->response_seq = htonl(resp_seq);
resp->result = ntohl(result);

/* now fix the chunk length */
ch->chunk_length = htons(len + old_len);
chk->book_size = len + old_len;
chk->book_size_scale = 0;
chk->send_size = SCTP_SIZE32(chk->book_size);
SCTP_BUF_LEN(chk->data) = chk->send_size;
return;
}

void
sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
			 struct sctp_stream_reset_list *ent,
			 int response)
{
struct sctp_association *asoc;
struct sctp_tmit_chunk *chk;
struct sctp_chunkhdr *ch;

asoc = &stcb->asoc;

/*
 * Reset our last reset action to the new one IP -> response
 * (PERFORMED probably). This assures that if we fail to send, a
 * retran from the peer will get the new response.
 */
asoc->last_reset_action[0] = response;
if (asoc->stream_reset_outstanding) {
	return;
}
sctp_alloc_a_chunk(stcb, chk);
if (chk == NULL) {
	SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
	return;
}
chk->copy_by_ref = 0;
chk->rec.chunk_id.id = SCTP_STREAM_RESET;
chk->rec.chunk_id.can_take_data = 0;
chk->flags = 0;
chk->asoc = &stcb->asoc;
chk->book_size = sizeof(struct sctp_chunkhdr);
chk->send_size = SCTP_SIZE32(chk->book_size);
chk->book_size_scale = 0;
chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
if (chk->data == NULL) {
	sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
	SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
	return;
}
SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
/* setup chunk parameters */
chk->sent = SCTP_DATAGRAM_UNSENT;
chk->snd_count = 0;
if (stcb->asoc.alternate) {
	chk->whoTo = stcb->asoc.alternate;
} else {
	chk->whoTo = stcb->asoc.primary_destination;
}
ch = mtod(chk->data, struct sctp_chunkhdr *);
ch->chunk_type = SCTP_STREAM_RESET;
ch->chunk_flags = 0;
ch->chunk_length = htons(chk->book_size);
atomic_add_int(&chk->whoTo->ref_count, 1);
SCTP_BUF_LEN(chk->data) = chk->send_size;
sctp_add_stream_reset_result(chk, ent->seq, response);
/* insert the chunk for sending */
TAILQ_INSERT_TAIL(&asoc->control_send_queue,
		  chk,
		  sctp_next);
asoc->ctrl_queue_cnt++;
}

void
sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
                                uint32_t resp_seq, uint32_t result,
                                uint32_t send_una, uint32_t recv_next)
{
uint16_t len, old_len;
struct sctp_stream_reset_response_tsn *resp;
struct sctp_chunkhdr *ch;

ch = mtod(chk->data, struct sctp_chunkhdr *);
old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));

/* get to new offset for the param. */
resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
/* now how long will this param be? */
len = sizeof(struct sctp_stream_reset_response_tsn);
resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
resp->ph.param_length = htons(len);
resp->response_seq = htonl(resp_seq);
resp->result = htonl(result);
resp->senders_next_tsn = htonl(send_una);
resp->receivers_next_tsn = htonl(recv_next);

/* now fix the chunk length */
ch->chunk_length = htons(len + old_len);
chk->book_size = len + old_len;
chk->send_size = SCTP_SIZE32(chk->book_size);
chk->book_size_scale = 0;
SCTP_BUF_LEN(chk->data) = chk->send_size;
return;
}

static void
sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
	       uint32_t seq,
	       uint16_t adding)
{
uint16_t len, old_len;
struct sctp_chunkhdr *ch;
struct sctp_stream_reset_add_strm *addstr;

ch = mtod(chk->data, struct sctp_chunkhdr *);
old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));

/* get to new offset for the param. */
addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
/* now how long will this param be? */
len = sizeof(struct sctp_stream_reset_add_strm);

/* Fill it out. */
addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
addstr->ph.param_length = htons(len);
addstr->request_seq = htonl(seq);
addstr->number_of_streams = htons(adding);
addstr->reserved = 0;

/* now fix the chunk length */
ch->chunk_length = htons(len + old_len);
chk->send_size = len + old_len;
chk->book_size = SCTP_SIZE32(chk->send_size);
chk->book_size_scale = 0;
SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
return;
}

static void
sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
                     uint32_t seq,
                     uint16_t adding)
{
uint16_t len, old_len;
struct sctp_chunkhdr *ch;
struct sctp_stream_reset_add_strm *addstr;

ch = mtod(chk->data, struct sctp_chunkhdr *);
old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));

/* get to new offset for the param. */
addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
/* now how long will this param be? */
len = sizeof(struct sctp_stream_reset_add_strm);
/* Fill it out. */
addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
addstr->ph.param_length = htons(len);
addstr->request_seq = htonl(seq);
addstr->number_of_streams = htons(adding);
addstr->reserved = 0;

/* now fix the chunk length */
ch->chunk_length = htons(len + old_len);
chk->send_size = len + old_len;
chk->book_size = SCTP_SIZE32(chk->send_size);
chk->book_size_scale = 0;
SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
return;
}

int
sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
{
struct sctp_association *asoc;
struct sctp_tmit_chunk *chk;
struct sctp_chunkhdr *ch;
uint32_t seq;

asoc = &stcb->asoc;
asoc->trigger_reset = 0;
if (asoc->stream_reset_outstanding) {
	return (EALREADY);
}
sctp_alloc_a_chunk(stcb, chk);
if (chk == NULL) {
	SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
	return (ENOMEM);
}
chk->copy_by_ref = 0;
chk->rec.chunk_id.id = SCTP_STREAM_RESET;
chk->rec.chunk_id.can_take_data = 0;
chk->flags = 0;
chk->asoc = &stcb->asoc;
chk->book_size = sizeof(struct sctp_chunkhdr);
chk->send_size = SCTP_SIZE32(chk->book_size);
chk->book_size_scale = 0;
chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
if (chk->data == NULL) {
	sctp_free_a_chunk(stcb, chk, so_locked);
	SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
	return (ENOMEM);
}
SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);

/* setup chunk parameters */
chk->sent = SCTP_DATAGRAM_UNSENT;
chk->snd_count = 0;
if (stcb->asoc.alternate) {
	chk->whoTo = stcb->asoc.alternate;
} else {
	chk->whoTo = stcb->asoc.primary_destination;
}
ch = mtod(chk->data, struct sctp_chunkhdr *);
ch->chunk_type = SCTP_STREAM_RESET;
ch->chunk_flags = 0;
ch->chunk_length = htons(chk->book_size);
atomic_add_int(&chk->whoTo->ref_count, 1);
SCTP_BUF_LEN(chk->data) = chk->send_size;
seq = stcb->asoc.str_reset_seq_out;
if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
	seq++;
	asoc->stream_reset_outstanding++;
} else {
	m_freem(chk->data);
	chk->data = NULL;
	sctp_free_a_chunk(stcb, chk, so_locked);
	return (ENOENT);
}
asoc->str_reset = chk;
/* insert the chunk for sending */
TAILQ_INSERT_TAIL(&asoc->control_send_queue,
		  chk,
		  sctp_next);
asoc->ctrl_queue_cnt++;

if (stcb->asoc.send_sack) {
	sctp_send_sack(stcb, so_locked);
}
sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
return (0);
}

int
sctp_send_str_reset_req(struct sctp_tcb *stcb,
                       uint16_t number_entries, uint16_t *list,
                       uint8_t send_in_req,
                       uint8_t send_tsn_req,
                       uint8_t add_stream,
                       uint16_t adding_o,
                       uint16_t adding_i, uint8_t peer_asked)
{
struct sctp_association *asoc;
struct sctp_tmit_chunk *chk;
struct sctp_chunkhdr *ch;
int can_send_out_req=0;
uint32_t seq;

SCTP_TCB_LOCK_ASSERT(stcb);

asoc = &stcb->asoc;
if (asoc->stream_reset_outstanding) {
	/*-
	 * Already one pending, must get ACK back to clear the flag.
	 */
	SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
	return (EBUSY);
}
if ((send_in_req == 0) && (send_tsn_req == 0) &&
    (add_stream == 0)) {
	/* nothing to do */
	SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
	return (EINVAL);
}
if (send_tsn_req && send_in_req) {
	/* error, can't do that */
	SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
	return (EINVAL);
} else if (send_in_req) {
	can_send_out_req = 1;
}
if (number_entries > (MCLBYTES -
                      SCTP_MIN_OVERHEAD -
                      sizeof(struct sctp_chunkhdr) -
                      sizeof(struct sctp_stream_reset_out_request)) /
                     sizeof(uint16_t)) {
	SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
	return (ENOMEM);
}
sctp_alloc_a_chunk(stcb, chk);
if (chk == NULL) {
	SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
	return (ENOMEM);
}
chk->copy_by_ref = 0;
chk->rec.chunk_id.id = SCTP_STREAM_RESET;
chk->rec.chunk_id.can_take_data = 0;
chk->flags = 0;
chk->asoc = &stcb->asoc;
chk->book_size = sizeof(struct sctp_chunkhdr);
chk->send_size = SCTP_SIZE32(chk->book_size);
chk->book_size_scale = 0;
chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
if (chk->data == NULL) {
	sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
	SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
	return (ENOMEM);
}
SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);

/* setup chunk parameters */
chk->sent = SCTP_DATAGRAM_UNSENT;
chk->snd_count = 0;
if (stcb->asoc.alternate) {
	chk->whoTo = stcb->asoc.alternate;
} else {
	chk->whoTo = stcb->asoc.primary_destination;
}
atomic_add_int(&chk->whoTo->ref_count, 1);
ch = mtod(chk->data, struct sctp_chunkhdr *);
ch->chunk_type = SCTP_STREAM_RESET;
ch->chunk_flags = 0;
ch->chunk_length = htons(chk->book_size);
SCTP_BUF_LEN(chk->data) = chk->send_size;

seq = stcb->asoc.str_reset_seq_out;
if (can_send_out_req) {
	int ret;

	ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
	if (ret) {
		seq++;
		asoc->stream_reset_outstanding++;
	}
}
if ((add_stream & 1) &&
    ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
	/* Need to allocate more */
	struct sctp_stream_out *oldstream;
	struct sctp_stream_queue_pending *sp, *nsp;
	int i;
#if defined(SCTP_DETAILED_STR_STATS)
	int j;
#endif

	oldstream = stcb->asoc.strmout;
	/* get some more */
	SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
		    (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
		    SCTP_M_STRMO);
	if (stcb->asoc.strmout == NULL) {
		uint8_t x;
		stcb->asoc.strmout = oldstream;
		/* Turn off the bit */
		x = add_stream & 0xfe;
		add_stream = x;
		goto skip_stuff;
	}
	/* Ok now we proceed with copying the old out stuff and
	 * initializing the new stuff.
	 */
	stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, false);
	for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
		TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
		/* FIX ME FIX ME */
		/* This should be a SS_COPY operation FIX ME STREAM SCHEDULER EXPERT */
		stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], &oldstream[i]);
		stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
#if defined(SCTP_DETAILED_STR_STATS)
		for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
			stcb->asoc.strmout[i].abandoned_sent[j] = oldstream[i].abandoned_sent[j];
			stcb->asoc.strmout[i].abandoned_unsent[j] = oldstream[i].abandoned_unsent[j];
		}
#else
		stcb->asoc.strmout[i].abandoned_sent[0] = oldstream[i].abandoned_sent[0];
		stcb->asoc.strmout[i].abandoned_unsent[0] = oldstream[i].abandoned_unsent[0];
#endif
		stcb->asoc.strmout[i].next_mid_ordered = oldstream[i].next_mid_ordered;
		stcb->asoc.strmout[i].next_mid_unordered = oldstream[i].next_mid_unordered;
		stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
		stcb->asoc.strmout[i].sid = i;
		stcb->asoc.strmout[i].state = oldstream[i].state;
		/* now anything on those queues? */
		TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
			TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
			TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
		}
	}
	/* now the new streams */
	stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc);
	for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
		TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
		stcb->asoc.strmout[i].chunks_on_queues = 0;
#if defined(SCTP_DETAILED_STR_STATS)
		for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
			stcb->asoc.strmout[i].abandoned_sent[j] = 0;
			stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
		}
#else
		stcb->asoc.strmout[i].abandoned_sent[0] = 0;
		stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
#endif
		stcb->asoc.strmout[i].next_mid_ordered = 0;
		stcb->asoc.strmout[i].next_mid_unordered = 0;
		stcb->asoc.strmout[i].sid = i;
		stcb->asoc.strmout[i].last_msg_incomplete = 0;
		stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
		stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
	}
	stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
	SCTP_FREE(oldstream, SCTP_M_STRMO);
}
skip_stuff:
if ((add_stream & 1) && (adding_o > 0)) {
	asoc->strm_pending_add_size = adding_o;
	asoc->peer_req_out = peer_asked;
	sctp_add_an_out_stream(chk, seq, adding_o);
	seq++;
	asoc->stream_reset_outstanding++;
}
if ((add_stream & 2) && (adding_i > 0)) {
	sctp_add_an_in_stream(chk, seq, adding_i);
	seq++;
	asoc->stream_reset_outstanding++;
}
if (send_in_req) {
	sctp_add_stream_reset_in(chk, number_entries, list, seq);
	seq++;
	asoc->stream_reset_outstanding++;
}
if (send_tsn_req) {
	sctp_add_stream_reset_tsn(chk, seq);
	asoc->stream_reset_outstanding++;
}
asoc->str_reset = chk;
/* insert the chunk for sending */
TAILQ_INSERT_TAIL(&asoc->control_send_queue,
		  chk,
		  sctp_next);
asoc->ctrl_queue_cnt++;
if (stcb->asoc.send_sack) {
	sctp_send_sack(stcb, SCTP_SO_LOCKED);
}
sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
return (0);
}

void
sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
               struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
#if defined(__FreeBSD__) && !defined(__Userspace__)
               uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
#endif
               uint32_t vrf_id, uint16_t port)
{
/* Don't respond to an ABORT with an ABORT. */
if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
	if (cause)
		sctp_m_freem(cause);
	return;
}
sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
#if defined(__FreeBSD__) && !defined(__Userspace__)
                   mflowtype, mflowid, fibnum,
#endif
                   vrf_id, port);
return;
}

void
sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
                  struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
#if defined(__FreeBSD__) && !defined(__Userspace__)
                  uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
#endif
                  uint32_t vrf_id, uint16_t port)
{
sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
#if defined(__FreeBSD__) && !defined(__Userspace__)
                   mflowtype, mflowid, fibnum,
#endif
                   vrf_id, port);
return;
}

static struct mbuf *
sctp_copy_resume(struct uio *uio,
	 int max_send_len,
#if defined(__FreeBSD__) || defined(__Userspace__)
	 int user_marks_eor,
#endif
	 int *error,
	 uint32_t *sndout,
	 struct mbuf **new_tail)
{
#if defined(__FreeBSD__) || defined(__Userspace__)
struct mbuf *m;

m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
	(M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
if (m == NULL) {
	/* The only possible error is EFAULT. */
	SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
	*error = EFAULT;
} else {
	*sndout = m_length(m, NULL);
	*new_tail = m_last(m);
}
return (m);
#else
int left, cancpy, willcpy;
struct mbuf *m, *head;

#if defined(__APPLE__) && !defined(__Userspace__)
#if defined(APPLE_LEOPARD)
left = (int)min(uio->uio_resid, max_send_len);
#else
left = (int)min(uio_resid(uio), max_send_len);
#endif
#else
left = (int)min(uio->uio_resid, max_send_len);
#endif
/* Always get a header just in case */
head = sctp_get_mbuf_for_msg(left, 0, M_WAITOK, 0, MT_DATA);
if (head == NULL) {
	SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
	*error = ENOBUFS;
	return (NULL);
}
cancpy = (int)M_TRAILINGSPACE(head);
willcpy = min(cancpy, left);
*error = uiomove(mtod(head, caddr_t), willcpy, uio);
if (*error != 0) {
	sctp_m_freem(head);
	return (NULL);
}
*sndout += willcpy;
left -= willcpy;
SCTP_BUF_LEN(head) = willcpy;
m = head;
*new_tail = head;
while (left > 0) {
	/* move in user data */
	SCTP_BUF_NEXT(m) = sctp_get_mbuf_for_msg(left, 0, M_WAITOK, 0, MT_DATA);
	if (SCTP_BUF_NEXT(m) == NULL) {
		sctp_m_freem(head);
		*new_tail = NULL;
		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
		*error = ENOBUFS;
		return (NULL);
	}
	m = SCTP_BUF_NEXT(m);
	cancpy = (int)M_TRAILINGSPACE(m);
	willcpy = min(cancpy, left);
	*error = uiomove(mtod(m, caddr_t), willcpy, uio);
	if (*error != 0) {
		sctp_m_freem(head);
		*new_tail = NULL;
		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, *error);
		return (NULL);
	}
	SCTP_BUF_LEN(m) = willcpy;
	left -= willcpy;
	*sndout += willcpy;
	*new_tail = m;
	if (left == 0) {
		SCTP_BUF_NEXT(m) = NULL;
	}
}
return (head);
#endif
}

static int
sctp_copy_one(struct sctp_stream_queue_pending *sp,
             struct uio *uio,
             int resv_upfront)
{
#if defined(__FreeBSD__) || defined(__Userspace__)
sp->data = m_uiotombuf(uio, M_WAITOK, sp->length, resv_upfront, 0);
if (sp->data == NULL) {
	/* The only possible error is EFAULT. */
	SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
	return (EFAULT);
}
sp->tail_mbuf = m_last(sp->data);
return (0);
#else
int left;
int cancpy, willcpy, error;
struct mbuf *m, *head;
int cpsz = 0;

/* First one gets a header */
left = sp->length;
head = m = sctp_get_mbuf_for_msg((left + resv_upfront), 0, M_WAITOK, 0, MT_DATA);
if (m == NULL) {
	SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
	return (ENOBUFS);
}
/*-
 * Add this one for m in now, that way if the alloc fails we won't
 * have a bad cnt.
 */
SCTP_BUF_RESV_UF(m, resv_upfront);
cancpy = (int)M_TRAILINGSPACE(m);
willcpy = min(cancpy, left);
while (left > 0) {
	/* move in user data */
	error = uiomove(mtod(m, caddr_t), willcpy, uio);
	if (error) {
		sctp_m_freem(head);
		return (error);
	}
	SCTP_BUF_LEN(m) = willcpy;
	left -= willcpy;
	cpsz += willcpy;
	if (left > 0) {
		SCTP_BUF_NEXT(m) = sctp_get_mbuf_for_msg(left, 0, M_WAITOK, 0, MT_DATA);
		if (SCTP_BUF_NEXT(m) == NULL) {
			/*
			 * the head goes back to caller, he can free
			 * the rest
			 */
			sctp_m_freem(head);
			SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
			return (ENOBUFS);
		}
		m = SCTP_BUF_NEXT(m);
		cancpy = (int)M_TRAILINGSPACE(m);
		willcpy = min(cancpy, left);
	} else {
		sp->tail_mbuf = m;
		SCTP_BUF_NEXT(m) = NULL;
	}
}
sp->data = head;
sp->length = cpsz;
return (0);
#endif
}

static struct sctp_stream_queue_pending *
sctp_copy_it_in(struct sctp_tcb *stcb,
   struct sctp_association *asoc,
   struct sctp_nonpad_sndrcvinfo *srcv,
   struct uio *uio,
   struct sctp_nets *net,
   ssize_t max_send_len,
   int user_marks_eor,
   int *error)

{
/*-
 * This routine must be very careful in its work. Protocol
 * processing is up and running so care must be taken to spl...()
 * when you need to do something that may effect the stcb/asoc. The
 * sb is locked however. When data is copied the protocol processing
 * should be enabled since this is a slower operation...
 */
struct sctp_stream_queue_pending *sp;
int resv_in_first;

*error = 0;
sctp_alloc_a_strmoq(stcb, sp);
if (sp == NULL) {
	SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
	*error = ENOMEM;
	goto out_now;
}
sp->act_flags = 0;
sp->sender_all_done = 0;
sp->sinfo_flags = srcv->sinfo_flags;
sp->timetolive = srcv->sinfo_timetolive;
sp->ppid = srcv->sinfo_ppid;
sp->context = srcv->sinfo_context;
sp->fsn = 0;
(void)SCTP_GETTIME_TIMEVAL(&sp->ts);
sp->sid = srcv->sinfo_stream;
#if defined(__APPLE__) && !defined(__Userspace__)
#if defined(APPLE_LEOPARD)
sp->length = (uint32_t)min(uio->uio_resid, max_send_len);
#else
sp->length = (uint32_t)min(uio_resid(uio), max_send_len);
#endif
#else
sp->length = (uint32_t)min(uio->uio_resid, max_send_len);
#endif
#if defined(__APPLE__) && !defined(__Userspace__)
#if defined(APPLE_LEOPARD)
if ((sp->length == (uint32_t)uio->uio_resid) &&
#else
if ((sp->length == (uint32_t)uio_resid(uio)) &&
#endif
#else
if ((sp->length == (uint32_t)uio->uio_resid) &&
#endif
    ((user_marks_eor == 0) ||
     (srcv->sinfo_flags & SCTP_EOF) ||
     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
	sp->msg_is_complete = 1;
} else {
	sp->msg_is_complete = 0;
}
sp->sender_all_done = 0;
sp->some_taken = 0;
sp->put_last_out = 0;
resv_in_first = SCTP_DATA_CHUNK_OVERHEAD(stcb);
sp->data = sp->tail_mbuf = NULL;
if (sp->length == 0) {
	goto skip_copy;
}
if (srcv->sinfo_keynumber_valid) {
	sp->auth_keyid = srcv->sinfo_keynumber;
} else {
	sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
}
if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
	sctp_auth_key_acquire(stcb, sp->auth_keyid);
	sp->holds_key_ref = 1;
}
#if defined(__APPLE__) && !defined(__Userspace__)
SCTP_SOCKET_UNLOCK(SCTP_INP_SO(stcb->sctp_ep), 0);
#endif
*error = sctp_copy_one(sp, uio, resv_in_first);
#if defined(__APPLE__) && !defined(__Userspace__)
SCTP_SOCKET_LOCK(SCTP_INP_SO(stcb->sctp_ep), 0);
#endif
skip_copy:
if (*error) {
#if defined(__Userspace__)
	SCTP_TCB_LOCK(stcb);
#endif
	sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
#if defined(__Userspace__)
	SCTP_TCB_UNLOCK(stcb);
#endif
	sp = NULL;
} else {
	if (sp->sinfo_flags & SCTP_ADDR_OVER) {
		sp->net = net;
		atomic_add_int(&sp->net->ref_count, 1);
	} else {
		sp->net = NULL;
	}
	sctp_set_prsctp_policy(sp);
}
out_now:
return (sp);
}

int
sctp_sosend(struct socket *so,
           struct sockaddr *addr,
           struct uio *uio,
           struct mbuf *top,
           struct mbuf *control,
#if defined(__APPLE__) && !defined(__Userspace__)
           int flags)
#else
           int flags,
#if defined(__FreeBSD__) && !defined(__Userspace__)
           struct thread *p)
#elif defined(_WIN32) && !defined(__Userspace__)
           PKTHREAD p)
#else
#if defined(__Userspace__)
           /*
     * proc is a dummy in __Userspace__ and will not be passed
     * to sctp_lower_sosend
     */
#endif
           struct proc *p)
#endif
#endif
{
struct sctp_sndrcvinfo sndrcvninfo;
#if defined(INET) && defined(INET6)
struct sockaddr_in sin;
#endif
struct sockaddr *addr_to_use;
#if defined(__APPLE__) && !defined(__Userspace__)
struct proc *p = current_proc();
#endif
int error;
bool use_sndinfo;

if (control != NULL) {
	/* process cmsg snd/rcv info (maybe a assoc-id) */
	use_sndinfo = sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control, sizeof(sndrcvninfo));
} else {
	use_sndinfo = false;
}
#if defined(INET) && defined(INET6)
if ((addr != NULL) && (addr->sa_family == AF_INET6)) {
	struct sockaddr_in6 *sin6;

#ifdef HAVE_SA_LEN
	if (addr->sa_len != sizeof(struct sockaddr_in6)) {
		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
		return (EINVAL);
	}
#endif
	sin6 = (struct sockaddr_in6 *)addr;
	if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
		in6_sin6_2_sin(&sin, sin6);
		addr_to_use = (struct sockaddr *)&sin;
	} else {
		addr_to_use = addr;
	}
} else {
	addr_to_use = addr;
}
#else
addr_to_use = addr;
#endif
#if defined(__APPLE__) && !defined(__Userspace__)
SCTP_SOCKET_LOCK(so, 1);
#endif
error = sctp_lower_sosend(so, addr_to_use, uio, top, control, flags,
#if defined(__Userspace__)
                          use_sndinfo ? &sndrcvninfo : NULL);
#else
                          use_sndinfo ? &sndrcvninfo : NULL, p);
#endif
#if defined(__APPLE__) && !defined(__Userspace__)
SCTP_SOCKET_UNLOCK(so, 1);
#endif
return (error);
}

int
sctp_lower_sosend(struct socket *so,
                 struct sockaddr *addr,
                 struct uio *uio,
                 struct mbuf *top,
                 struct mbuf *control,
                 int flags,
#if defined(__Userspace__)
                 struct sctp_sndrcvinfo *srcv)
#else
                 struct sctp_sndrcvinfo *srcv,
#if defined(__FreeBSD__)
                 struct thread *p)
#elif defined(_WIN32)
                 PKTHREAD p)
#else
                 struct proc *p)
#endif
#endif
{
struct sctp_nonpad_sndrcvinfo sndrcvninfo_buf;
#if defined(__FreeBSD__) && !defined(__Userspace__)
struct epoch_tracker et;
#endif
struct timeval now;
struct sctp_block_entry be;
struct sctp_inpcb *inp;
struct sctp_tcb *stcb = NULL;
struct sctp_nets *net;
struct sctp_association *asoc;
struct sctp_inpcb *t_inp;
struct sctp_nonpad_sndrcvinfo *sndrcvninfo;
ssize_t sndlen = 0, max_len, local_add_more;
ssize_t local_soresv = 0;
sctp_assoc_t sinfo_assoc_id;
int user_marks_eor;
int nagle_applies = 0;
int error;
int queue_only = 0, queue_only_for_init = 0;
int un_sent;
int now_filled = 0;
unsigned int inqueue_bytes = 0;
uint16_t port;
uint16_t sinfo_flags;
uint16_t sinfo_stream;
bool create_lock_applied = false;
bool free_cnt_applied = false;
bool some_on_control;
bool got_all_of_the_send = false;
bool non_blocking = false;

error = 0;
net = NULL;
stcb = NULL;

#if defined(__APPLE__) && !defined(__Userspace__)
sctp_lock_assert(so);
#endif
if ((uio == NULL) && (top == NULL)) {
	error = EINVAL;
	goto out_unlocked;
}
if (addr != NULL) {
	union sctp_sockstore *raddr = (union sctp_sockstore *)addr;

	switch (raddr->sa.sa_family) {
#ifdef INET
	case AF_INET:
#ifdef HAVE_SIN_LEN
		if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
			error = EINVAL;
			goto out_unlocked;
		}
#endif
		port = raddr->sin.sin_port;
		break;
#endif
#ifdef INET6
	case AF_INET6:
#ifdef HAVE_SIN6_LEN
		if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
			error = EINVAL;
			goto out_unlocked;
		}
#endif
		port = raddr->sin6.sin6_port;
		break;
#endif
#if defined(__Userspace__)
	case AF_CONN:
#ifdef HAVE_SCONN_LEN
		if (raddr->sconn.sconn_len != sizeof(struct sockaddr_conn)) {
			error = EINVAL;
			goto out_unlocked;
		}
#endif
		port = raddr->sconn.sconn_port;
		break;
#endif
	default:
		error = EAFNOSUPPORT;
		goto out_unlocked;
	}
} else {
	port = 0;
}
if (uio != NULL) {
#if defined(__APPLE__) && !defined(__Userspace__)
#if defined(APPLE_LEOPARD)
	if (uio->uio_resid < 0) {
#else
	if (uio_resid(uio) < 0) {
#endif
#else
	if (uio->uio_resid < 0) {
#endif
		error = EINVAL;
		goto out_unlocked;
	}
#if defined(__APPLE__) && !defined(__Userspace__)
#if defined(APPLE_LEOPARD)
	sndlen = uio->uio_resid;
#else
	sndlen = uio_resid(uio);
#endif
#else
	sndlen = uio->uio_resid;
#endif
} else {
	sndlen = SCTP_HEADER_LEN(top);
}
SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %zd\n",
        (void *)addr, sndlen);

t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
if (inp == NULL) {
	error = EINVAL;
	goto out_unlocked;
}
user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
if ((uio == NULL) && (user_marks_eor != 0)) {
	/*-
	 * We do not support eeor mode for
	 * sending with mbuf chains (like sendfile).
	 */
	error = EINVAL;
	goto out_unlocked;
}
if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
    SCTP_IS_LISTENING(inp)) {
	/* The listener can NOT send. */
	error = EINVAL;
	goto out_unlocked;
}
atomic_add_int(&inp->total_sends, 1);

if (srcv != NULL) {
	sndrcvninfo = (struct sctp_nonpad_sndrcvinfo *)srcv;
	sinfo_assoc_id = sndrcvninfo->sinfo_assoc_id;
	sinfo_flags = sndrcvninfo->sinfo_flags;
	if (INVALID_SINFO_FLAG(sinfo_flags) ||
	    PR_SCTP_INVALID_POLICY(sinfo_flags)) {
		error = EINVAL;
		goto out_unlocked;
	}
	if (sinfo_flags != 0) {
		SCTP_STAT_INCR(sctps_sends_with_flags);
	}
} else {
	sndrcvninfo = NULL;
	sinfo_flags = inp->def_send.sinfo_flags;
	sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
}
#if defined(__FreeBSD__) && !defined(__Userspace__)
if (flags & MSG_EOR) {
	sinfo_flags |= SCTP_EOR;
}
if (flags & MSG_EOF) {
	sinfo_flags |= SCTP_EOF;
}
#endif
if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
	error = EINVAL;
	goto out_unlocked;
}
SCTP_INP_RLOCK(inp);
if ((sinfo_flags & SCTP_SENDALL) &&
    (inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE)) {
	SCTP_INP_RUNLOCK(inp);
	error = sctp_sendall(inp, uio, top, sndrcvninfo);
	top = NULL;
	goto out_unlocked;
}
/* Now we must find the association. */
if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
    (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
	stcb = LIST_FIRST(&inp->sctp_asoc_list);
	if (stcb != NULL) {
		SCTP_TCB_LOCK(stcb);
	}
	SCTP_INP_RUNLOCK(inp);
} else if (sinfo_assoc_id > SCTP_ALL_ASSOC) {
	stcb = sctp_findasoc_ep_asocid_locked(inp, sinfo_assoc_id, 1);
	SCTP_INP_RUNLOCK(inp);
	if (stcb != NULL) {
		SCTP_TCB_LOCK_ASSERT(stcb);
	}
} else if (addr != NULL) {
	/*-
	 * Since we did not use findep we must
	 * increment it, and if we don't find a tcb
	 * decrement it.
	 */
	SCTP_INP_INCR_REF(inp);
	SCTP_INP_RUNLOCK(inp);
	stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
	if (stcb == NULL) {
		SCTP_INP_WLOCK(inp);
		SCTP_INP_DECR_REF(inp);
		SCTP_INP_WUNLOCK(inp);
	} else {
		SCTP_TCB_LOCK_ASSERT(stcb);
	}
} else {
	SCTP_INP_RUNLOCK(inp);
}

#ifdef INVARIANTS
if (stcb != NULL) {
	SCTP_TCB_LOCK_ASSERT(stcb);
}
#endif

if ((stcb == NULL) && (addr != NULL)) {
	/* Possible implicit send? */
	SCTP_ASOC_CREATE_LOCK(inp);
	create_lock_applied = true;
	if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
	    (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
		error = EINVAL;
		goto out_unlocked;
	}
	if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
	    (addr->sa_family == AF_INET6)) {
		error = EINVAL;
		goto out_unlocked;
	}
	SCTP_INP_WLOCK(inp);
	SCTP_INP_INCR_REF(inp);
	SCTP_INP_WUNLOCK(inp);
	/* With the lock applied look again */
	stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
#if defined(INET) || defined(INET6)
	if ((stcb == NULL) && (control != NULL) && (port > 0)) {
		stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
	}
#endif
	if (stcb == NULL) {
		SCTP_INP_WLOCK(inp);
		SCTP_INP_DECR_REF(inp);
		SCTP_INP_WUNLOCK(inp);
	} else {
		SCTP_TCB_LOCK_ASSERT(stcb);
		SCTP_ASOC_CREATE_UNLOCK(inp);
		create_lock_applied = false;
	}
	if (error != 0) {
		goto out_unlocked;
	}
	if (t_inp != inp) {
		error = ENOTCONN;
		goto out_unlocked;
	}
}
if (stcb == NULL) {
	if (addr == NULL) {
		error = ENOENT;
		goto out_unlocked;
	} else {
		/* We must go ahead and start the INIT process */
		uint32_t vrf_id;

		if ((sinfo_flags & SCTP_ABORT) ||
		    ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
			/*-
			 * User asks to abort a non-existent assoc,
			 * or EOF a non-existent assoc with no data
			 */
			error = ENOENT;
			goto out_unlocked;
		}
		/* get an asoc/stcb struct */
		vrf_id = inp->def_vrf_id;
		KASSERT(create_lock_applied, ("create_lock_applied is false"));
		stcb = sctp_aloc_assoc_connected(inp, addr, &error, 0, 0, vrf_id,
		                                 inp->sctp_ep.pre_open_stream_count,
		                                 inp->sctp_ep.port,
#if !defined(__Userspace__)
		                                 p,
#else
		                                 (struct proc *)NULL,
#endif
		                                 SCTP_INITIALIZE_AUTH_PARAMS);
		if (stcb == NULL) {
			/* error is setup for us in the call. */
			KASSERT(error != 0, ("error is 0 although stcb is NULL"));
			goto out_unlocked;
		}
		SCTP_TCB_LOCK_ASSERT(stcb);
		SCTP_ASOC_CREATE_UNLOCK(inp);
		create_lock_applied = false;
		/* Turn on queue only flag to prevent data from being sent */
		queue_only = 1;
		SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
		(void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
		if (control != NULL) {
			if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
				sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
				                SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
				stcb = NULL;
				KASSERT(error != 0,
				    ("error is 0 although sctp_process_cmsgs_for_init() indicated an error"));
				goto out_unlocked;
			}
		}
		/* out with the INIT */
		queue_only_for_init = 1;
		/*-
		 * we may want to dig in after this call and adjust the MTU
		 * value. It defaulted to 1500 (constant) but the ro
		 * structure may now have an update and thus we may need to
		 * change it BEFORE we append the message.
		 */
	}
}

KASSERT(!create_lock_applied, ("create_lock_applied is true"));
KASSERT(stcb != NULL, ("stcb is NULL"));
SCTP_TCB_LOCK_ASSERT(stcb);

asoc = &stcb->asoc;
if ((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
    (asoc->state & SCTP_STATE_WAS_ABORTED)) {
	if (asoc->state & SCTP_STATE_WAS_ABORTED) {
		/* XXX: Could also be ECONNABORTED, not enough info. */
		error = ECONNRESET;
	} else {
		error = ENOTCONN;
	}
	goto out_unlocked;
}
if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
    (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
	queue_only = 1;
}
/* Keep the stcb from being freed under our feet. */
atomic_add_int(&asoc->refcnt, 1);
free_cnt_applied = true;
if (sndrcvninfo == NULL) {
	/* Use a local copy to have a consistent view. */
	sndrcvninfo_buf = asoc->def_send;
	sndrcvninfo = &sndrcvninfo_buf;
	sinfo_flags = sndrcvninfo->sinfo_flags;
#if defined(__FreeBSD__) && !defined(__Userspace__)
	if (flags & MSG_EOR) {
		sinfo_flags |= SCTP_EOR;
	}
	if (flags & MSG_EOF) {
		sinfo_flags |= SCTP_EOF;
	}
#endif
}
/* Are we aborting? */
if (sinfo_flags & SCTP_ABORT) {
	struct mbuf *mm;
	struct sctp_paramhdr *ph;
	ssize_t tot_demand, tot_out = 0, max_out;

	SCTP_STAT_INCR(sctps_sends_with_abort);
	if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
	    (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
		/* It has to be up before we abort. */
		error = EINVAL;
		goto out_unlocked;
	}
	/* How big is the user initiated abort? */
	if (top != NULL) {
		struct mbuf *cntm;

		if (sndlen != 0) {
			for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
				tot_out += SCTP_BUF_LEN(cntm);
			}
		}
		mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_NOWAIT, 1, MT_DATA);
	} else {
		/* Must fit in a MTU */
		tot_out = sndlen;
		tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
		if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
			error = EMSGSIZE;
			goto out_unlocked;
		}
		mm = sctp_get_mbuf_for_msg((unsigned int)tot_demand, 0, M_NOWAIT, 1, MT_DATA);
	}
	if (mm == NULL) {
		error = ENOMEM;
		goto out_unlocked;
	}
	max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
	max_out -= sizeof(struct sctp_abort_msg);
	if (tot_out > max_out) {
		tot_out = max_out;
	}
	ph = mtod(mm, struct sctp_paramhdr *);
	ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
	ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + tot_out));
	ph++;
	SCTP_BUF_LEN(mm) = (int)(tot_out + sizeof(struct sctp_paramhdr));
	if (top == NULL) {
		SCTP_TCB_UNLOCK(stcb);
#if defined(__APPLE__) && !defined(__Userspace__)
		SCTP_SOCKET_UNLOCK(so, 0);
#endif
		error = uiomove((caddr_t)ph, (int)tot_out, uio);
#if defined(__APPLE__) && !defined(__Userspace__)
		SCTP_SOCKET_LOCK(so, 0);
#endif
		SCTP_TCB_LOCK(stcb);
		if ((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
		    (asoc->state & SCTP_STATE_WAS_ABORTED)) {
			sctp_m_freem(mm);
			if (asoc->state & SCTP_STATE_WAS_ABORTED) {
				/* XXX: Could also be ECONNABORTED, not enough info. */
				error = ECONNRESET;
			} else {
				error = ENOTCONN;
			}
			goto out_unlocked;
		}
		if (error != 0) {
			/*-
			 * Here if we can't get his data we
			 * still abort we just don't get to
			 * send the users note :-0
			 */
			sctp_m_freem(mm);
			mm = NULL;
			error = 0;
		}
	} else {
		if (sndlen != 0) {
			SCTP_BUF_NEXT(mm) = top;
		}
	}
	atomic_subtract_int(&asoc->refcnt, 1);
	free_cnt_applied = false;
	/* release this lock, otherwise we hang on ourselves */
#if defined(__FreeBSD__) && !defined(__Userspace__)
	NET_EPOCH_ENTER(et);
#endif
	sctp_abort_an_association(stcb->sctp_ep, stcb, mm, false, SCTP_SO_LOCKED);
#if defined(__FreeBSD__) && !defined(__Userspace__)
	NET_EPOCH_EXIT(et);
#endif
	stcb = NULL;
	/* In this case top is already chained to mm
	 * avoid double free, since we free it below if
	 * top != NULL and driver would free it after sending
	 * the packet out
	 */
	if (sndlen != 0) {
		top = NULL;
	}
	goto out_unlocked;
}

KASSERT(stcb != NULL, ("stcb is NULL"));
SCTP_TCB_LOCK_ASSERT(stcb);
KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
        ("Association about to be freed"));
KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
        ("Association was aborted"));

if (sinfo_flags & SCTP_ADDR_OVER) {
	if (addr != NULL) {
		net = sctp_findnet(stcb, addr);
	} else {
		net = NULL;
	}
	if ((net == NULL) ||
	    ((port != 0) && (port != stcb->rport))) {
		error = EINVAL;
		goto out_unlocked;
	}
} else {
	if (asoc->alternate != NULL) {
		net = asoc->alternate;
	} else {
		net = asoc->primary_destination;
	}
}
if (sndlen == 0) {
	if (sinfo_flags & SCTP_EOF) {
		got_all_of_the_send = true;
		goto dataless_eof;
	} else {
		error = EINVAL;
		goto out_unlocked;
	}
}
if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
	if (sndlen > (ssize_t)asoc->smallest_mtu) {
		error = EMSGSIZE;
		goto out_unlocked;
	}
}
sinfo_stream = sndrcvninfo->sinfo_stream;
/* Is the stream no. valid? */
if (sinfo_stream >= asoc->streamoutcnt) {
	/* Invalid stream number */
	error = EINVAL;
	goto out_unlocked;
}
if ((asoc->strmout[sinfo_stream].state != SCTP_STREAM_OPEN) &&
    (asoc->strmout[sinfo_stream].state != SCTP_STREAM_OPENING)) {
	/*
	 * Can't queue any data while stream reset is underway.
	 */
	if (asoc->strmout[sinfo_stream].state > SCTP_STREAM_OPEN) {
		error = EAGAIN;
	} else {
		error = EINVAL;
	}
	goto out_unlocked;
}
atomic_add_int(&stcb->total_sends, 1);
#if defined(__Userspace__)
if (inp->recv_callback != NULL) {
	non_blocking = true;
}
#endif
#if defined(__FreeBSD__) && !defined(__Userspace__)
if (SCTP_SO_IS_NBIO(so) || (flags & (MSG_NBIO | MSG_DONTWAIT)) != 0) {
#else
if (SCTP_SO_IS_NBIO(so)) {
#endif
	non_blocking = true;
}
if (non_blocking) {
	ssize_t amount;

	inqueue_bytes = asoc->total_output_queue_size - (asoc->chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
	if (user_marks_eor == 0) {
		amount = sndlen;
	} else {
		amount = 1;
	}
	if ((SCTP_SB_LIMIT_SND(so) < (amount + inqueue_bytes + asoc->sb_send_resv)) ||
	    (asoc->chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
		if ((sndlen > (ssize_t)SCTP_SB_LIMIT_SND(so)) &&
		    (user_marks_eor == 0)) {
			error = EMSGSIZE;
		} else {
			error = EWOULDBLOCK;
		}
		goto out_unlocked;
	}
}
atomic_add_int(&asoc->sb_send_resv, (int)sndlen);
local_soresv = sndlen;

KASSERT(stcb != NULL, ("stcb is NULL"));
SCTP_TCB_LOCK_ASSERT(stcb);
KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
        ("Association about to be freed"));
KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
        ("Association was aborted"));

/* Ok, we will attempt a msgsnd :> */
#if !(defined(_WIN32) || defined(__Userspace__))
if (p != NULL) {
#if defined(__FreeBSD__)
	p->td_ru.ru_msgsnd++;
#else
	p->p_stats->p_ru.ru_msgsnd++;
#endif
}
#endif
/* Calculate the maximum we can send */
inqueue_bytes = asoc->total_output_queue_size - (asoc->chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
	max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
} else {
	max_len = 0;
}
/* Unless E_EOR mode is on, we must make a send FIT in one call. */
if ((user_marks_eor == 0) &&
    (sndlen > (ssize_t)SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
	/* It will NEVER fit. */
	error = EMSGSIZE;
	goto out_unlocked;
}
if (user_marks_eor != 0) {
	local_add_more = (ssize_t)min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
} else {
	/*-
	 * For non-eeor the whole message must fit in
	 * the socket send buffer.
	 */
	local_add_more = sndlen;
}
if (non_blocking) {
	goto skip_preblock;
}
if (((max_len <= local_add_more) && ((ssize_t)SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
    (max_len == 0) ||
    ((asoc->chunks_on_out_queue + asoc->stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
	/* No room right now! */
	inqueue_bytes = asoc->total_output_queue_size - (asoc->chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
	SOCKBUF_LOCK(&so->so_snd);
	while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
	       ((asoc->stream_queue_cnt + asoc->chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
		SCTPDBG(SCTP_DEBUG_OUTPUT1,"pre_block limit:%u <(inq:%d + %zd) || (%d+%d > %d)\n",
		        (unsigned int)SCTP_SB_LIMIT_SND(so),
		        inqueue_bytes,
		        local_add_more,
		        asoc->stream_queue_cnt,
		        asoc->chunks_on_out_queue,
		        SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
			sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
		}
		be.error = 0;
#if !(defined(_WIN32) && !defined(__Userspace__))
		stcb->block_entry = &be;
#endif
		SCTP_TCB_UNLOCK(stcb);
#if defined(__FreeBSD__) && !defined(__Userspace__)
		error = sbwait(so, SO_SND);
#else
		error = sbwait(&so->so_snd);
#endif
		if (error == 0) {
			if (so->so_error != 0) {
				error = so->so_error;
			}
			if (be.error != 0) {
				error = be.error;
			}
		}
		SOCKBUF_UNLOCK(&so->so_snd);
		SCTP_TCB_LOCK(stcb);
		stcb->block_entry = NULL;
		if (error != 0) {
			goto out_unlocked;
		}
		if ((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
		    (asoc->state & SCTP_STATE_WAS_ABORTED)) {
			if (asoc->state & SCTP_STATE_WAS_ABORTED) {
				/* XXX: Could also be ECONNABORTED, not enough info. */
				error = ECONNRESET;
			} else {
				error = ENOTCONN;
			}
			goto out_unlocked;
		}
		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
			sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
			               asoc, asoc->total_output_queue_size);
		}
		inqueue_bytes = asoc->total_output_queue_size - (asoc->chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
		SOCKBUF_LOCK(&so->so_snd);
	}
	if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
		max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
	} else {
		max_len = 0;
	}
	SOCKBUF_UNLOCK(&so->so_snd);
}

skip_preblock:
KASSERT(stcb != NULL, ("stcb is NULL"));
SCTP_TCB_LOCK_ASSERT(stcb);
KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
        ("Association about to be freed"));
KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
        ("Association was aborted"));

#if defined(__APPLE__) && !defined(__Userspace__)
error = sblock(&so->so_snd, SBLOCKWAIT(flags));
if (error != 0) {
	goto out_unlocked;
}
#endif
/* sndlen covers for mbuf case
 * uio_resid covers for the non-mbuf case
 * NOTE: uio will be null when top/mbuf is passed
 */
if (top == NULL) {
	struct sctp_stream_queue_pending *sp;
	struct sctp_stream_out *strm;
	uint32_t sndout;

	if ((asoc->stream_locked) &&
	    (asoc->stream_locked_on != sinfo_stream)) {
		error = EINVAL;
		goto out;
	}
	strm = &asoc->strmout[sinfo_stream];
	if (strm->last_msg_incomplete == 0) {
	do_a_copy_in:
		SCTP_TCB_UNLOCK(stcb);
		sp = sctp_copy_it_in(stcb, asoc, sndrcvninfo, uio, net, max_len, user_marks_eor, &error);
		SCTP_TCB_LOCK(stcb);
		if ((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
		    (asoc->state & SCTP_STATE_WAS_ABORTED)) {
			if (asoc->state & SCTP_STATE_WAS_ABORTED) {
				/* XXX: Could also be ECONNABORTED, not enough info. */
				error = ECONNRESET;
			} else {
				error = ENOTCONN;
			}
			goto out;
		}
		if (error != 0) {
			goto out;
		}
		/*
		 * Reject the sending of a new user message, if the
		 * association is about to be shut down.
		 */
		if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
		    (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
		    (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
		    (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
			if (sp->data != 0) {
				sctp_m_freem(sp->data);
				sp->data = NULL;
				sp->tail_mbuf = NULL;
				sp->length = 0;
			}
			if (sp->net != NULL) {
				sctp_free_remote_addr(sp->net);
				sp->net = NULL;
			}
			sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
			error = EPIPE;
			goto out_unlocked;
		}
		/* The out streams might be reallocated. */
		strm = &asoc->strmout[sinfo_stream];
		if (sp->msg_is_complete) {
			strm->last_msg_incomplete = 0;
			asoc->stream_locked = 0;
		} else {
			/* Just got locked to this guy in
			 * case of an interrupt.
			 */
			strm->last_msg_incomplete = 1;
			if (asoc->idata_supported == 0) {
				asoc->stream_locked = 1;
				asoc->stream_locked_on = sinfo_stream;
			}
			sp->sender_all_done = 0;
		}
		sctp_snd_sb_alloc(stcb, sp->length);
		atomic_add_int(&asoc->stream_queue_cnt, 1);
		if (sinfo_flags & SCTP_UNORDERED) {
			SCTP_STAT_INCR(sctps_sends_with_unord);
		}
		sp->processing = 1;
		TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
		asoc->ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp);
	} else {
		sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
		if (sp == NULL) {
			/* ???? Huh ??? last msg is gone */
#ifdef INVARIANTS
			panic("Warning: Last msg marked incomplete, yet nothing left?");
#else
			SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
			strm->last_msg_incomplete = 0;
#endif
			goto do_a_copy_in;
		}
		if (sp->processing != 0) {
			error = EINVAL;
			goto out;
		} else {
			sp->processing = 1;
		}
	}

	KASSERT(stcb != NULL, ("stcb is NULL"));
	SCTP_TCB_LOCK_ASSERT(stcb);
	KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
	        ("Association about to be freed"));
	KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
	        ("Association was aborted"));

#if defined(__APPLE__) && !defined(__Userspace__)
#if defined(APPLE_LEOPARD)
	while (uio->uio_resid > 0) {
#else
	while (uio_resid(uio) > 0) {
#endif
#else
	while (uio->uio_resid > 0) {
#endif
		/* How much room do we have? */
		struct mbuf *new_tail, *mm;

		inqueue_bytes = asoc->total_output_queue_size - (asoc->chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
		if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
			max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
		} else {
			max_len = 0;
		}
		if ((max_len > (ssize_t)SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
		    ((max_len > 0 ) && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
#if defined(__APPLE__) && !defined(__Userspace__)
#if defined(APPLE_LEOPARD)
		    (uio->uio_resid <= max_len)) {
#else
		    (uio_resid(uio) <= max_len)) {
#endif
#else
		    (uio->uio_resid <= max_len)) {
#endif
			SCTP_TCB_UNLOCK(stcb);
#if defined(__APPLE__) && !defined(__Userspace__)
			SCTP_SOCKET_UNLOCK(so, 0);
#endif
			sndout = 0;
			new_tail = NULL;
#if defined(__FreeBSD__) || defined(__Userspace__)
			mm = sctp_copy_resume(uio, (int)max_len, user_marks_eor, &error, &sndout, &new_tail);
#else
			mm = sctp_copy_resume(uio, (int)max_len, &error, &sndout, &new_tail);
#endif
#if defined(__APPLE__) && !defined(__Userspace__)
			SCTP_SOCKET_LOCK(so, 0);
#endif
			SCTP_TCB_LOCK(stcb);
			if ((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
			    (asoc->state & SCTP_STATE_WAS_ABORTED)) {
				/* We need to get out.
				 * Peer probably aborted.
				 */
				sctp_m_freem(mm);
				if (asoc->state & SCTP_STATE_WAS_ABORTED) {
					/* XXX: Could also be ECONNABORTED, not enough info. */
					error = ECONNRESET;
				} else {
					error = ENOTCONN;
				}
				goto out;
			}
			if ((mm == NULL) || (error != 0)) {
				if (mm != NULL) {
					sctp_m_freem(mm);
				}
				if (sp != NULL) {
					sp->processing = 0;
				}
				goto out;
			}
			/* Update the mbuf and count */
			if (sp->tail_mbuf != NULL) {
				/* Tack it to the end. */
				SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
			} else {
				/* A stolen mbuf. */
				sp->data = mm;
			}
			sp->tail_mbuf = new_tail;
			sctp_snd_sb_alloc(stcb, sndout);
			atomic_add_int(&sp->length, sndout);
			if (sinfo_flags & SCTP_SACK_IMMEDIATELY) {
				sp->sinfo_flags |= SCTP_SACK_IMMEDIATELY;
			}

			/* Did we reach EOR? */
#if defined(__APPLE__) && !defined(__Userspace__)
#if defined(APPLE_LEOPARD)
			if ((uio->uio_resid == 0) &&
#else
			if ((uio_resid(uio) == 0) &&
#endif
#else
			if ((uio->uio_resid == 0) &&
#endif
			    ((user_marks_eor == 0) ||
			     (sinfo_flags & SCTP_EOF) ||
			     (user_marks_eor && (sinfo_flags & SCTP_EOR)))) {
				sp->msg_is_complete = 1;
			} else {
				sp->msg_is_complete = 0;
			}
		}

		KASSERT(stcb != NULL, ("stcb is NULL"));
		SCTP_TCB_LOCK_ASSERT(stcb);
		KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
		        ("Association about to be freed"));
		KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
		        ("Association was aborted"));

#if defined(__APPLE__) && !defined(__Userspace__)
#if defined(APPLE_LEOPARD)
		if (uio->uio_resid == 0) {
#else
		if (uio_resid(uio) == 0) {
#endif
#else
		if (uio->uio_resid == 0) {
#endif
			/* got it all? */
			continue;
		}
		/* PR-SCTP? */
		if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
			/* This is ugly but we must assure locking order */
			sctp_prune_prsctp(stcb, asoc, sndrcvninfo, (int)sndlen);
			inqueue_bytes = asoc->total_output_queue_size - (asoc->chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
			if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
				max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
			else
				max_len = 0;
			if (max_len > 0) {
				continue;
			}
		}
		/* wait for space now */
		if (non_blocking) {
			/* Non-blocking io in place out */
			if (sp != NULL) {
				sp->processing = 0;
			}
			goto skip_out_eof;
		}
		/* What about the INIT, send it maybe */
		if (queue_only_for_init) {
			if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
				/* a collision took us forward? */
				queue_only = 0;
			} else {
#if defined(__FreeBSD__) && !defined(__Userspace__)
				NET_EPOCH_ENTER(et);
#endif
				sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
#if defined(__FreeBSD__) && !defined(__Userspace__)
				NET_EPOCH_EXIT(et);
#endif
				SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
				queue_only = 1;
			}
		}
		if ((net->flight_size > net->cwnd) &&
		    (asoc->sctp_cmt_on_off == 0)) {
			SCTP_STAT_INCR(sctps_send_cwnd_avoid);
			queue_only = 1;
		} else if (asoc->ifp_had_enobuf) {
			SCTP_STAT_INCR(sctps_ifnomemqueued);
			if (net->flight_size > (2 * net->mtu)) {
				queue_only = 1;
			}
			asoc->ifp_had_enobuf = 0;
		}
		un_sent = asoc->total_output_queue_size - asoc->total_flight;
		if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
		    (asoc->total_flight > 0) &&
		    (asoc->stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
		    (un_sent < (int)(asoc->smallest_mtu - SCTP_MIN_OVERHEAD))) {
			/*-
			 * Ok, Nagle is set on and we have data outstanding.
			 * Don't send anything and let SACKs drive out the
			 * data unless we have a "full" segment to send.
			 */
			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
				sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
			}
			SCTP_STAT_INCR(sctps_naglequeued);
			nagle_applies = 1;
		} else {
			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
				if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
					sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
			}
			SCTP_STAT_INCR(sctps_naglesent);
			nagle_applies = 0;
		}
		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
			sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
			               nagle_applies, un_sent);
			sctp_misc_ints(SCTP_CWNDLOG_PRESEND, asoc->total_output_queue_size,
			               asoc->total_flight,
			               asoc->chunks_on_out_queue, asoc->total_flight_count);
		}
		if (queue_only_for_init) {
			queue_only_for_init = 0;
		}
		if ((queue_only == 0) && (nagle_applies == 0)) {
			/*-
			 * need to start chunk output
			 * before blocking.. note that if
			 * a lock is already applied, then
			 * the input via the net is happening
			 * and I don't need to start output :-D
			 */
#if defined(__FreeBSD__) && !defined(__Userspace__)
			NET_EPOCH_ENTER(et);
#endif
			sctp_chunk_output(inp, stcb,
			                  SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
#if defined(__FreeBSD__) && !defined(__Userspace__)
			NET_EPOCH_EXIT(et);
#endif
		}
		/*-
		 * This is a bit strange, but I think it will
		 * work. The total_output_queue_size is locked and
		 * protected by the TCB_LOCK, which we just released.
		 * There is a race that can occur between releasing it
		 * above, and me getting the socket lock, where sacks
		 * come in but we have not put the SB_WAIT on the
		 * so_snd buffer to get the wakeup. After the LOCK
		 * is applied the sack_processing will also need to
		 * LOCK the so->so_snd to do the actual sowwakeup(). So
		 * once we have the socket buffer lock if we recheck the
		 * size we KNOW we will get to sleep safely with the
		 * wakeup flag in place.
		 */
		inqueue_bytes = asoc->total_output_queue_size - (asoc->chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
		SOCKBUF_LOCK(&so->so_snd);
		if (SCTP_SB_LIMIT_SND(so) <= (inqueue_bytes +
		                              min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
#if defined(__APPLE__) && !defined(__Userspace__)
#if defined(APPLE_LEOPARD)
				sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
				               asoc, uio->uio_resid);
#else
				sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
				               asoc, uio_resid(uio));
#endif
#else
				sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
				               asoc, uio->uio_resid);
#endif
			}
			be.error = 0;
#if !(defined(_WIN32) && !defined(__Userspace__))
			stcb->block_entry = &be;
#endif
			SCTP_TCB_UNLOCK(stcb);
#if defined(__APPLE__) && !defined(__Userspace__)
			sbunlock(&so->so_snd, 1);
#endif
#if defined(__FreeBSD__) && !defined(__Userspace__)
			error = sbwait(so, SO_SND);
#else
			error = sbwait(&so->so_snd);
#endif
			if (error == 0) {
				if (so->so_error != 0)
					error = so->so_error;
				if (be.error != 0) {
					error = be.error;
				}
			}
			SOCKBUF_UNLOCK(&so->so_snd);
			SCTP_TCB_LOCK(stcb);
			stcb->block_entry = NULL;
			if ((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
			    (asoc->state & SCTP_STATE_WAS_ABORTED)) {
				if (asoc->state & SCTP_STATE_WAS_ABORTED) {
					/* XXX: Could also be ECONNABORTED, not enough info. */
					error = ECONNRESET;
				} else {
					error = ENOTCONN;
				}
				goto out_unlocked;
			}
			if (error != 0) {
				if (sp != NULL) {
					sp->processing = 0;
				}
				goto out_unlocked;
			}
#if defined(__APPLE__) && !defined(__Userspace__)
			error = sblock(&so->so_snd, SBLOCKWAIT(flags));
			if (error != 0) {
				goto out_unlocked;
			}
#endif
		} else {
			SOCKBUF_UNLOCK(&so->so_snd);
		}
		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
			sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
			               asoc, asoc->total_output_queue_size);
		}
	}

	KASSERT(stcb != NULL, ("stcb is NULL"));
	SCTP_TCB_LOCK_ASSERT(stcb);
	KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
	        ("Association about to be freed"));
	KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
	        ("Association was aborted"));

	/* The out streams might be reallocated. */
	strm = &asoc->strmout[sinfo_stream];
	if (sp != NULL) {
		if (sp->msg_is_complete == 0) {
			strm->last_msg_incomplete = 1;
			if (asoc->idata_supported == 0) {
				asoc->stream_locked = 1;
				asoc->stream_locked_on = sinfo_stream;
			}
		} else {
			sp->sender_all_done = 1;
			strm->last_msg_incomplete = 0;
			asoc->stream_locked = 0;
		}
		sp->processing = 0;
	} else {
		SCTP_PRINTF("Huh no sp TSNH?\n");
		strm->last_msg_incomplete = 0;
		asoc->stream_locked = 0;
	}
#if defined(__APPLE__) && !defined(__Userspace__)
#if defined(APPLE_LEOPARD)
	if (uio->uio_resid == 0) {
#else
	if (uio_resid(uio) == 0) {
#endif
#else
	if (uio->uio_resid == 0) {
#endif
		got_all_of_the_send = true;
	}
} else {
	error = sctp_msg_append(stcb, net, top, sndrcvninfo);
	top = NULL;
	if ((sinfo_flags & SCTP_EOF) != 0) {
		got_all_of_the_send = true;
	}
}
if (error != 0) {
	goto out;
}

dataless_eof:
KASSERT(stcb != NULL, ("stcb is NULL"));
SCTP_TCB_LOCK_ASSERT(stcb);
KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
        ("Association about to be freed"));
KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
        ("Association was aborted"));

/* EOF thing ? */
if ((sinfo_flags & SCTP_EOF) && got_all_of_the_send) {
	SCTP_STAT_INCR(sctps_sends_with_eof);
	error = 0;
	if (TAILQ_EMPTY(&asoc->send_queue) &&
	    TAILQ_EMPTY(&asoc->sent_queue) &&
	    sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED) == 0) {
		if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete)(stcb, asoc)) {
			goto abort_anyway;
		}
		/* there is nothing queued to send, so I'm done... */
		if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
		    (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
		    (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
			struct sctp_nets *netp;

			/* only send SHUTDOWN the first time through */
			if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
				SCTP_STAT_DECR_GAUGE32(sctps_currestab);
			}
			SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
			sctp_stop_timers_for_shutdown(stcb);
			if (asoc->alternate != NULL) {
				netp = asoc->alternate;
			} else {
				netp = asoc->primary_destination;
			}
			sctp_send_shutdown(stcb, netp);
			sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
			                 netp);
			sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
			                 NULL);
		}
	} else {
		/*-
		 * we still got (or just got) data to send, so set
		 * SHUTDOWN_PENDING
		 */
		/*-
		 * XXX sockets draft says that SCTP_EOF should be
		 * sent with no data.  currently, we will allow user
		 * data to be sent first and move to
		 * SHUTDOWN-PENDING
		 */
		if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
		    (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
		    (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
			if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete)(stcb, asoc)) {
				SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
			}
			SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
			if (TAILQ_EMPTY(&asoc->send_queue) &&
			    TAILQ_EMPTY(&asoc->sent_queue) &&
			    (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
				struct mbuf *op_err;
				char msg[SCTP_DIAG_INFO_LEN];

			abort_anyway:
				if (free_cnt_applied) {
					atomic_subtract_int(&asoc->refcnt, 1);
					free_cnt_applied = false;
				}
				SCTP_SNPRINTF(msg, sizeof(msg),
				              "%s:%d at %s", __FILE__, __LINE__, __func__);
				op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
				                             msg);
#if defined(__FreeBSD__) && !defined(__Userspace__)
				NET_EPOCH_ENTER(et);
#endif
				sctp_abort_an_association(stcb->sctp_ep, stcb,
				                          op_err, false, SCTP_SO_LOCKED);
#if defined(__FreeBSD__) && !defined(__Userspace__)
				NET_EPOCH_EXIT(et);
#endif
				stcb = NULL;
				error = ECONNABORTED;
				goto out;
			}
			sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
		}
	}
}

skip_out_eof:
KASSERT(stcb != NULL, ("stcb is NULL"));
SCTP_TCB_LOCK_ASSERT(stcb);
KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
        ("Association about to be freed"));
KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
        ("Association was aborted"));

some_on_control = !TAILQ_EMPTY(&asoc->control_send_queue);
if (queue_only_for_init) {
	if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
		/* a collision took us forward? */
		queue_only = 0;
	} else {
#if defined(__FreeBSD__) && !defined(__Userspace__)
		NET_EPOCH_ENTER(et);
#endif
		sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
#if defined(__FreeBSD__) && !defined(__Userspace__)
		NET_EPOCH_EXIT(et);
#endif
		SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
		queue_only = 1;
	}
}

KASSERT(stcb != NULL, ("stcb is NULL"));
SCTP_TCB_LOCK_ASSERT(stcb);
KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
        ("Association about to be freed"));
KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
        ("Association was aborted"));

if ((net->flight_size > net->cwnd) &&
    (asoc->sctp_cmt_on_off == 0)) {
	SCTP_STAT_INCR(sctps_send_cwnd_avoid);
	queue_only = 1;
} else if (asoc->ifp_had_enobuf) {
	SCTP_STAT_INCR(sctps_ifnomemqueued);
	if (net->flight_size > (2 * net->mtu)) {
		queue_only = 1;
	}
	asoc->ifp_had_enobuf = 0;
}
un_sent = asoc->total_output_queue_size - asoc->total_flight;
if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
    (asoc->total_flight > 0) &&
    (asoc->stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
    (un_sent < (int)(asoc->smallest_mtu - SCTP_MIN_OVERHEAD))) {
	/*-
	 * Ok, Nagle is set on and we have data outstanding.
	 * Don't send anything and let SACKs drive out the
	 * data unless wen have a "full" segment to send.
	 */
	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
		sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
	}
	SCTP_STAT_INCR(sctps_naglequeued);
	nagle_applies = 1;
} else {
	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
		if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
			sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
	}
	SCTP_STAT_INCR(sctps_naglesent);
	nagle_applies = 0;
}
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
	sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
	               nagle_applies, un_sent);
	sctp_misc_ints(SCTP_CWNDLOG_PRESEND, asoc->total_output_queue_size,
	               asoc->total_flight,
	               asoc->chunks_on_out_queue, asoc->total_flight_count);
}

KASSERT(stcb != NULL, ("stcb is NULL"));
SCTP_TCB_LOCK_ASSERT(stcb);
KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
        ("Association about to be freed"));
KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
        ("Association was aborted"));

#if defined(__FreeBSD__) && !defined(__Userspace__)
NET_EPOCH_ENTER(et);
#endif
if ((queue_only == 0) && (nagle_applies == 0) && (asoc->peers_rwnd && un_sent)) {
	sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
} else if ((queue_only == 0) &&
           (asoc->peers_rwnd == 0) &&
           (asoc->total_flight == 0)) {
	/* We get to have a probe outstanding */
	sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
} else if (some_on_control) {
	int num_out, reason;

	/* Here we do control only */
	(void)sctp_med_chunk_output(inp, stcb, asoc, &num_out,
	                            &reason, 1, 1, &now, &now_filled,
	                            sctp_get_frag_point(stcb),
	                            SCTP_SO_LOCKED);
}
#if defined(__FreeBSD__) && !defined(__Userspace__)
NET_EPOCH_EXIT(et);
#endif
SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
        queue_only, asoc->peers_rwnd, un_sent,
        asoc->total_flight, asoc->chunks_on_out_queue,
        asoc->total_output_queue_size, error);

KASSERT(stcb != NULL, ("stcb is NULL"));
SCTP_TCB_LOCK_ASSERT(stcb);
KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
        ("Association about to be freed"));
KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
        ("Association was aborted"));

out:
#if defined(__APPLE__) && !defined(__Userspace__)
sbunlock(&so->so_snd, 1);
#endif
out_unlocked:
if (create_lock_applied) {
	SCTP_ASOC_CREATE_UNLOCK(inp);
}
if (stcb != NULL) {
	if (local_soresv) {
		atomic_subtract_int(&asoc->sb_send_resv, (int)sndlen);
	}
	if (free_cnt_applied) {
		atomic_subtract_int(&asoc->refcnt, 1);
	}
	SCTP_TCB_UNLOCK(stcb);
}
if (top != NULL) {
	sctp_m_freem(top);
}
if (control != NULL) {
	sctp_m_freem(control);
}
SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
return (error);
}

/*
* generate an AUTHentication chunk, if required
*/
struct mbuf *
sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
   struct sctp_auth_chunk **auth_ret, uint32_t * offset,
   struct sctp_tcb *stcb, uint8_t chunk)
{
struct mbuf *m_auth;
struct sctp_auth_chunk *auth;
int chunk_len;
struct mbuf *cn;

if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
    (stcb == NULL))
	return (m);

if (stcb->asoc.auth_supported == 0) {
	return (m);
}
/* does the requested chunk require auth? */
if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
	return (m);
}
m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
if (m_auth == NULL) {
	/* no mbuf's */
	return (m);
}
/* reserve some space if this will be the first mbuf */
if (m == NULL)
	SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
/* fill in the AUTH chunk details */
auth = mtod(m_auth, struct sctp_auth_chunk *);
memset(auth, 0, sizeof(*auth));
auth->ch.chunk_type = SCTP_AUTHENTICATION;
auth->ch.chunk_flags = 0;
chunk_len = sizeof(*auth) +
    sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
auth->ch.chunk_length = htons(chunk_len);
auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
/* key id and hmac digest will be computed and filled in upon send */

/* save the offset where the auth was inserted into the chain */
*offset = 0;
for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
	*offset += SCTP_BUF_LEN(cn);
}

/* update length and return pointer to the auth chunk */
SCTP_BUF_LEN(m_auth) = chunk_len;
m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
if (auth_ret != NULL)
	*auth_ret = auth;

return (m);
}

#if (defined(__FreeBSD__) || defined(__APPLE__)) && !defined(__Userspace__)
#ifdef INET6
int
sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t *ro)
{
struct nd_prefix *pfx = NULL;
struct nd_pfxrouter *pfxrtr = NULL;
struct sockaddr_in6 gw6;

#if defined(__FreeBSD__)
if (ro == NULL || ro->ro_nh == NULL || src6->sin6_family != AF_INET6)
#else
if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
#endif
	return (0);

/* get prefix entry of address */
#if defined(__FreeBSD__)
ND6_RLOCK();
#endif
LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
	if (pfx->ndpr_stateflags & NDPRF_DETACHED)
		continue;
	if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
	    &src6->sin6_addr, &pfx->ndpr_mask))
		break;
}
/* no prefix entry in the prefix list */
if (pfx == NULL) {
#if defined(__FreeBSD__)
	ND6_RUNLOCK();
#endif
	SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
	return (0);
}

SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);

/* search installed gateway from prefix entry */
LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
	memset(&gw6, 0, sizeof(struct sockaddr_in6));
	gw6.sin6_family = AF_INET6;
#ifdef HAVE_SIN6_LEN
	gw6.sin6_len = sizeof(struct sockaddr_in6);
#endif
	memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
	    sizeof(struct in6_addr));
	SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
	SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
#if defined(__FreeBSD__)
	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ro->ro_nh->gw_sa);
#else
	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
#endif
#if defined(__FreeBSD__)
	if (sctp_cmpaddr((struct sockaddr *)&gw6, &ro->ro_nh->gw_sa)) {
		ND6_RUNLOCK();
#else
	if (sctp_cmpaddr((struct sockaddr *)&gw6, ro->ro_rt->rt_gateway)) {
#endif
		SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
		return (1);
	}
}
#if defined(__FreeBSD__)
ND6_RUNLOCK();
#endif
SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
return (0);
}
#endif

int
sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t *ro)
{
#ifdef INET
struct sockaddr_in *sin, *mask;
struct ifaddr *ifa;
struct in_addr srcnetaddr, gwnetaddr;

#if defined(__FreeBSD__)
if (ro == NULL || ro->ro_nh == NULL ||
#else
if (ro == NULL || ro->ro_rt == NULL ||
#endif
    sifa->address.sa.sa_family != AF_INET) {
	return (0);
}
ifa = (struct ifaddr *)sifa->ifa;
mask = (struct sockaddr_in *)(ifa->ifa_netmask);
sin = &sifa->address.sin;
srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);

#if defined(__FreeBSD__)
sin = &ro->ro_nh->gw4_sa;
#else
sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
#endif
gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
#if defined(__FreeBSD__)
SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ro->ro_nh->gw_sa);
#else
SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
#endif
SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
	return (1);
}
#endif
return (0);
}
#elif defined(__Userspace__)
/* TODO __Userspace__ versions of sctp_vXsrc_match_nexthop(). */
int
sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t *ro)
{
   return (0);
}
int
sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t *ro)
{
   return (0);
}

#endif