tor-browser

sctp6_usrreq.c (46187B)

---

/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 2001-2007, 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>
#ifdef INET6
#if defined(__FreeBSD__) && !defined(__Userspace__)
#include <sys/proc.h>
#endif
#include <netinet/sctp_pcb.h>
#include <netinet/sctp_header.h>
#include <netinet/sctp_var.h>
#include <netinet6/sctp6_var.h>
#include <netinet/sctp_sysctl.h>
#include <netinet/sctp_output.h>
#include <netinet/sctp_uio.h>
#include <netinet/sctp_asconf.h>
#include <netinet/sctputil.h>
#include <netinet/sctp_indata.h>
#include <netinet/sctp_timer.h>
#include <netinet/sctp_auth.h>
#include <netinet/sctp_input.h>
#include <netinet/sctp_output.h>
#include <netinet/sctp_bsd_addr.h>
#include <netinet/sctp_crc32.h>
#if !defined(_WIN32)
#include <netinet/icmp6.h>
#include <netinet/udp.h>
#endif
#if defined(__Userspace__)
int ip6_v6only=0;
#endif
#if defined(__Userspace__)
#ifdef INET
void
in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
{
#if defined(_WIN32)
uint32_t temp;
#endif
memset(sin, 0, sizeof(*sin));
#ifdef HAVE_SIN_LEN
sin->sin_len = sizeof(struct sockaddr_in);
#endif
sin->sin_family = AF_INET;
sin->sin_port = sin6->sin6_port;
#if defined(_WIN32)
temp = sin6->sin6_addr.s6_addr16[7];
temp = temp << 16;
temp = temp | sin6->sin6_addr.s6_addr16[6];
sin->sin_addr.s_addr = temp;
#else
sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3];
#endif
}

void
in6_sin6_2_sin_in_sock(struct sockaddr *nam)
{
struct sockaddr_in *sin_p;
struct sockaddr_in6 sin6;

/* save original sockaddr_in6 addr and convert it to sockaddr_in  */
sin6 = *(struct sockaddr_in6 *)nam;
sin_p = (struct sockaddr_in *)nam;
in6_sin6_2_sin(sin_p, &sin6);
}

void
in6_sin_2_v4mapsin6(const struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
{
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 = sin->sin_port;
#if defined(_WIN32)
((uint32_t *)&sin6->sin6_addr)[0] = 0;
((uint32_t *)&sin6->sin6_addr)[1] = 0;
((uint32_t *)&sin6->sin6_addr)[2] = htonl(0xffff);
((uint32_t *)&sin6->sin6_addr)[3] = sin->sin_addr.s_addr;
#else
sin6->sin6_addr.s6_addr32[0] = 0;
sin6->sin6_addr.s6_addr32[1] = 0;
sin6->sin6_addr.s6_addr32[2] = htonl(0xffff);
sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr;
#endif
}
#endif
#endif

#if !defined(__Userspace__)
int
#if defined(__APPLE__) || defined(__FreeBSD__)
sctp6_input_with_port(struct mbuf **i_pak, int *offp, uint16_t port)
#else
sctp6_input(struct mbuf **i_pak, int *offp, int proto)
#endif
{
struct mbuf *m;
int iphlen;
uint32_t vrf_id;
uint8_t ecn_bits;
struct sockaddr_in6 src, dst;
struct ip6_hdr *ip6;
struct sctphdr *sh;
struct sctp_chunkhdr *ch;
int length, offset;
uint8_t compute_crc;
#if defined(__FreeBSD__)
uint32_t mflowid;
uint8_t mflowtype;
uint16_t fibnum;
#endif
#if !(defined(__APPLE__) || defined(__FreeBSD__))
uint16_t port = 0;
#endif

iphlen = *offp;
if (SCTP_GET_PKT_VRFID(*i_pak, vrf_id)) {
	SCTP_RELEASE_PKT(*i_pak);
	return (IPPROTO_DONE);
}
m = SCTP_HEADER_TO_CHAIN(*i_pak);
#ifdef SCTP_MBUF_LOGGING
/* Log in any input mbufs */
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
	sctp_log_mbc(m, SCTP_MBUF_INPUT);
}
#endif
#ifdef SCTP_PACKET_LOGGING
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
	sctp_packet_log(m);
}
#endif
#if defined(__FreeBSD__)
SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
        "sctp6_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
        m->m_pkthdr.len,
        if_name(m->m_pkthdr.rcvif),
        (int)m->m_pkthdr.csum_flags, CSUM_BITS);
#endif
#if defined(__APPLE__)
SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
        "sctp6_input(): Packet of length %d received on %s%d with csum_flags 0x%x.\n",
        m->m_pkthdr.len,
        m->m_pkthdr.rcvif->if_name,
        m->m_pkthdr.rcvif->if_unit,
        m->m_pkthdr.csum_flags);
#endif
#if defined(_WIN32) && !defined(__Userspace__)
SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
        "sctp6_input(): Packet of length %d received on %s with csum_flags 0x%x.\n",
        m->m_pkthdr.len,
        m->m_pkthdr.rcvif->if_xname,
        m->m_pkthdr.csum_flags);
#endif
#if defined(__FreeBSD__)
mflowid = m->m_pkthdr.flowid;
mflowtype = M_HASHTYPE_GET(m);
fibnum = M_GETFIB(m);
#endif
SCTP_STAT_INCR(sctps_recvpackets);
SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
/* Get IP, SCTP, and first chunk header together in the first mbuf. */
offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
if (m->m_len < offset) {
	m = m_pullup(m, offset);
	if (m == NULL) {
		SCTP_STAT_INCR(sctps_hdrops);
		return (IPPROTO_DONE);
	}
}
ip6 = mtod(m, struct ip6_hdr *);
sh = (struct sctphdr *)(mtod(m, caddr_t) + iphlen);
ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
offset -= sizeof(struct sctp_chunkhdr);
memset(&src, 0, sizeof(struct sockaddr_in6));
src.sin6_family = AF_INET6;
#ifdef HAVE_SIN6_LEN
src.sin6_len = sizeof(struct sockaddr_in6);
#endif
src.sin6_port = sh->src_port;
src.sin6_addr = ip6->ip6_src;
#if defined(__FreeBSD__)
#if defined(__APPLE__)
/* XXX: This code should also be used on Apple */
#endif
if (in6_setscope(&src.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
	goto out;
}
#endif
memset(&dst, 0, sizeof(struct sockaddr_in6));
dst.sin6_family = AF_INET6;
#ifdef HAVE_SIN6_LEN
dst.sin6_len = sizeof(struct sockaddr_in6);
#endif
dst.sin6_port = sh->dest_port;
dst.sin6_addr = ip6->ip6_dst;
#if defined(__FreeBSD__)
#if defined(__APPLE__)
/* XXX: This code should also be used on Apple */
#endif
if (in6_setscope(&dst.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
	goto out;
}
#endif
#if defined(__APPLE__)
#if defined(NFAITH) && 0 < NFAITH
if (faithprefix(&dst.sin6_addr)) {
	goto out;
}
#endif
#endif
length = ntohs(ip6->ip6_plen) + iphlen;
/* Validate mbuf chain length with IP payload length. */
if (SCTP_HEADER_LEN(m) != length) {
	SCTPDBG(SCTP_DEBUG_INPUT1,
	        "sctp6_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
	SCTP_STAT_INCR(sctps_hdrops);
	goto out;
}
if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
	goto out;
}
#if defined(__FreeBSD__)
ecn_bits = IPV6_TRAFFIC_CLASS(ip6);
if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
	SCTP_STAT_INCR(sctps_recvhwcrc);
	compute_crc = 0;
} else {
#else
ecn_bits = ((ntohl(ip6->ip6_flow) >> 20) & 0x000000ff);
if (SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
    (IN6_ARE_ADDR_EQUAL(&src.sin6_addr, &dst.sin6_addr))) {
	SCTP_STAT_INCR(sctps_recvhwcrc);
	compute_crc = 0;
} else {
#endif
	SCTP_STAT_INCR(sctps_recvswcrc);
	compute_crc = 1;
}
sctp_common_input_processing(&m, iphlen, offset, length,
                             (struct sockaddr *)&src,
                             (struct sockaddr *)&dst,
                             sh, ch,
                             compute_crc,
                             ecn_bits,
#if defined(__FreeBSD__)
                             mflowtype, mflowid, fibnum,
#endif
                             vrf_id, port);
out:
if (m) {
	sctp_m_freem(m);
}
return (IPPROTO_DONE);
}

#if defined(__APPLE__)
int
sctp6_input(struct mbuf **i_pak, int *offp)
{
return (sctp6_input_with_port(i_pak, offp, 0));
}
#endif
#if defined(__FreeBSD__)
int
sctp6_input(struct mbuf **i_pak, int *offp, int proto SCTP_UNUSED)
{
return (sctp6_input_with_port(i_pak, offp, 0));
}
#endif

void
sctp6_notify(struct sctp_inpcb *inp,
            struct sctp_tcb *stcb,
            struct sctp_nets *net,
            uint8_t icmp6_type,
            uint8_t icmp6_code,
            uint32_t next_mtu)
{
#if defined(__APPLE__)
struct socket *so;
#endif
int timer_stopped;

switch (icmp6_type) {
case ICMP6_DST_UNREACH:
	if ((icmp6_code == ICMP6_DST_UNREACH_NOROUTE) ||
	    (icmp6_code == ICMP6_DST_UNREACH_ADMIN) ||
	    (icmp6_code == ICMP6_DST_UNREACH_BEYONDSCOPE) ||
	    (icmp6_code == ICMP6_DST_UNREACH_ADDR)) {
		/* Mark the net unreachable. */
		if (net->dest_state & SCTP_ADDR_REACHABLE) {
			/* Ok that destination is not reachable */
			net->dest_state &= ~SCTP_ADDR_REACHABLE;
			net->dest_state &= ~SCTP_ADDR_PF;
			sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
			                stcb, 0, (void *)net, SCTP_SO_NOT_LOCKED);
		}
	}
	SCTP_TCB_UNLOCK(stcb);
	break;
case ICMP6_PARAM_PROB:
	/* Treat it like an ABORT. */
	if (icmp6_code == ICMP6_PARAMPROB_NEXTHEADER) {
		sctp_abort_notification(stcb, true, false, 0, NULL, SCTP_SO_NOT_LOCKED);
#if defined(__APPLE__)
		so = SCTP_INP_SO(inp);
		atomic_add_int(&stcb->asoc.refcnt, 1);
		SCTP_TCB_UNLOCK(stcb);
		SCTP_SOCKET_LOCK(so, 1);
		SCTP_TCB_LOCK(stcb);
		atomic_subtract_int(&stcb->asoc.refcnt, 1);
#endif
		(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
				      SCTP_FROM_SCTP_USRREQ + SCTP_LOC_2);
#if defined(__APPLE__)
		SCTP_SOCKET_UNLOCK(so, 1);
#endif
	} else {
		SCTP_TCB_UNLOCK(stcb);
	}
	break;
case ICMP6_PACKET_TOO_BIG:
	if (net->dest_state & SCTP_ADDR_NO_PMTUD) {
		SCTP_TCB_UNLOCK(stcb);
		break;
	}
	if (SCTP_OS_TIMER_PENDING(&net->pmtu_timer.timer)) {
		timer_stopped = 1;
		sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net,
		                SCTP_FROM_SCTP_USRREQ + SCTP_LOC_1);
	} else {
		timer_stopped = 0;
	}
	/* Update the path MTU. */
	if (net->port) {
		next_mtu -= sizeof(struct udphdr);
	}
	if (net->mtu > next_mtu) {
		net->mtu = next_mtu;
#if defined(__FreeBSD__)
		if (net->port) {
			sctp_hc_set_mtu(&net->ro._l_addr, inp->fibnum, next_mtu + sizeof(struct udphdr));
		} else {
			sctp_hc_set_mtu(&net->ro._l_addr, inp->fibnum, next_mtu);
		}
#endif
	}
	/* Update the association MTU */
	if (stcb->asoc.smallest_mtu > next_mtu) {
		sctp_pathmtu_adjustment(stcb, next_mtu, true);
	}
	/* Finally, start the PMTU timer if it was running before. */
	if (timer_stopped) {
		sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net);
	}
	SCTP_TCB_UNLOCK(stcb);
	break;
default:
	SCTP_TCB_UNLOCK(stcb);
	break;
}
}

#if defined(__FreeBSD__) && !defined(__Userspace__)
void
sctp6_ctlinput(struct ip6ctlparam *ip6cp)
{
struct sctp_inpcb *inp;
struct sctp_tcb *stcb;
struct sctp_nets *net;
struct sctphdr sh;
struct sockaddr_in6 src, dst;

if (icmp6_errmap(ip6cp->ip6c_icmp6) == 0) {
	return;
}

/*
 * Check if we can safely examine the ports and the
 * verification tag of the SCTP common header.
 */
if (ip6cp->ip6c_m->m_pkthdr.len <
    (int32_t)(ip6cp->ip6c_off + offsetof(struct sctphdr, checksum))) {
	return;
}

/* Copy out the port numbers and the verification tag. */
memset(&sh, 0, sizeof(sh));
m_copydata(ip6cp->ip6c_m,
           ip6cp->ip6c_off,
           sizeof(uint16_t) + sizeof(uint16_t) + sizeof(uint32_t),
           (caddr_t)&sh);
memset(&src, 0, sizeof(struct sockaddr_in6));
src.sin6_family = AF_INET6;
src.sin6_len = sizeof(struct sockaddr_in6);
src.sin6_port = sh.src_port;
src.sin6_addr = ip6cp->ip6c_ip6->ip6_src;
if (in6_setscope(&src.sin6_addr, ip6cp->ip6c_m->m_pkthdr.rcvif, NULL) != 0) {
	return;
}
memset(&dst, 0, sizeof(struct sockaddr_in6));
dst.sin6_family = AF_INET6;
dst.sin6_len = sizeof(struct sockaddr_in6);
dst.sin6_port = sh.dest_port;
dst.sin6_addr = ip6cp->ip6c_ip6->ip6_dst;
if (in6_setscope(&dst.sin6_addr, ip6cp->ip6c_m->m_pkthdr.rcvif, NULL) != 0) {
	return;
}
inp = NULL;
net = NULL;
stcb = sctp_findassociation_addr_sa((struct sockaddr *)&dst,
                                    (struct sockaddr *)&src,
                                    &inp, &net, 1, SCTP_DEFAULT_VRFID);
if ((stcb != NULL) &&
    (net != NULL) &&
    (inp != NULL)) {
	/* Check the verification tag */
	if (ntohl(sh.v_tag) != 0) {
		/*
		 * This must be the verification tag used for
		 * sending out packets. We don't consider
		 * packets reflecting the verification tag.
		 */
		if (ntohl(sh.v_tag) != stcb->asoc.peer_vtag) {
			SCTP_TCB_UNLOCK(stcb);
			return;
		}
	} else {
		if (ip6cp->ip6c_m->m_pkthdr.len >=
		    ip6cp->ip6c_off + sizeof(struct sctphdr) +
		                      sizeof(struct sctp_chunkhdr) +
		                      offsetof(struct sctp_init, a_rwnd)) {
			/*
			 * In this case we can check if we
			 * got an INIT chunk and if the
			 * initiate tag matches.
			 */
			uint32_t initiate_tag;
			uint8_t chunk_type;

			m_copydata(ip6cp->ip6c_m,
			           ip6cp->ip6c_off +
			           sizeof(struct sctphdr),
			           sizeof(uint8_t),
			           (caddr_t)&chunk_type);
			m_copydata(ip6cp->ip6c_m,
			           ip6cp->ip6c_off +
			           sizeof(struct sctphdr) +
			           sizeof(struct sctp_chunkhdr),
			           sizeof(uint32_t),
			           (caddr_t)&initiate_tag);
			if ((chunk_type != SCTP_INITIATION) ||
			    (ntohl(initiate_tag) != stcb->asoc.my_vtag)) {
				SCTP_TCB_UNLOCK(stcb);
				return;
			}
		} else {
			SCTP_TCB_UNLOCK(stcb);
			return;
		}
	}
	sctp6_notify(inp, stcb, net,
	             ip6cp->ip6c_icmp6->icmp6_type,
	             ip6cp->ip6c_icmp6->icmp6_code,
	             ntohl(ip6cp->ip6c_icmp6->icmp6_mtu));
} else {
	if ((stcb == NULL) && (inp != NULL)) {
		/* reduce inp's ref-count */
		SCTP_INP_WLOCK(inp);
		SCTP_INP_DECR_REF(inp);
		SCTP_INP_WUNLOCK(inp);
	}
	if (stcb) {
		SCTP_TCB_UNLOCK(stcb);
	}
}
}
#else
void
#if defined(__APPLE__) && !defined(APPLE_LEOPARD) && !defined(APPLE_SNOWLEOPARD) && !defined(APPLE_LION) && !defined(APPLE_MOUNTAINLION) && !defined(APPLE_ELCAPITAN)
sctp6_ctlinput(int cmd, struct sockaddr *pktdst, void *d, struct ifnet *ifp SCTP_UNUSED)
#else
sctp6_ctlinput(int cmd, struct sockaddr *pktdst, void *d)
#endif
{
struct ip6ctlparam *ip6cp;
struct sctp_inpcb *inp;
struct sctp_tcb *stcb;
struct sctp_nets *net;
struct sctphdr sh;
struct sockaddr_in6 src, dst;

#ifdef HAVE_SA_LEN
if (pktdst->sa_family != AF_INET6 ||
    pktdst->sa_len != sizeof(struct sockaddr_in6)) {
#else
if (pktdst->sa_family != AF_INET6) {
#endif
	return;
}

if ((unsigned)cmd >= PRC_NCMDS) {
	return;
}
if (PRC_IS_REDIRECT(cmd)) {
	d = NULL;
} else if (inet6ctlerrmap[cmd] == 0) {
	return;
}
/* If the parameter is from icmp6, decode it. */
if (d != NULL) {
	ip6cp = (struct ip6ctlparam *)d;
} else {
	ip6cp = (struct ip6ctlparam *)NULL;
}

if (ip6cp != NULL) {
	/*
	 * XXX: We assume that when IPV6 is non NULL, M and OFF are
	 * valid.
	 */
	if (ip6cp->ip6c_m == NULL) {
		return;
	}

	/* Check if we can safely examine the ports and the
	 * verification tag of the SCTP common header.
	 */
	if (ip6cp->ip6c_m->m_pkthdr.len <
	    (int32_t)(ip6cp->ip6c_off + offsetof(struct sctphdr, checksum))) {
		return;
	}

	/* Copy out the port numbers and the verification tag. */
	memset(&sh, 0, sizeof(sh));
	m_copydata(ip6cp->ip6c_m,
	           ip6cp->ip6c_off,
	           sizeof(uint16_t) + sizeof(uint16_t) + sizeof(uint32_t),
	           (caddr_t)&sh);
	memset(&src, 0, sizeof(struct sockaddr_in6));
	src.sin6_family = AF_INET6;
#ifdef HAVE_SIN6_LEN
	src.sin6_len = sizeof(struct sockaddr_in6);
#endif
	src.sin6_port = sh.src_port;
	src.sin6_addr = ip6cp->ip6c_ip6->ip6_src;
	memset(&dst, 0, sizeof(struct sockaddr_in6));
	dst.sin6_family = AF_INET6;
#ifdef HAVE_SIN6_LEN
	dst.sin6_len = sizeof(struct sockaddr_in6);
#endif
	dst.sin6_port = sh.dest_port;
	dst.sin6_addr = ip6cp->ip6c_ip6->ip6_dst;
	inp = NULL;
	net = NULL;
	stcb = sctp_findassociation_addr_sa((struct sockaddr *)&dst,
	                                    (struct sockaddr *)&src,
	                                    &inp, &net, 1, SCTP_DEFAULT_VRFID);
	if ((stcb != NULL) &&
	    (net != NULL) &&
	    (inp != NULL)) {
		/* Check the verification tag */
		if (ntohl(sh.v_tag) != 0) {
			/*
			 * This must be the verification tag used for
			 * sending out packets. We don't consider
			 * packets reflecting the verification tag.
			 */
			if (ntohl(sh.v_tag) != stcb->asoc.peer_vtag) {
				SCTP_TCB_UNLOCK(stcb);
				return;
			}
		} else {
			SCTP_TCB_UNLOCK(stcb);
			return;
		}
		sctp6_notify(inp, stcb, net,
		             ip6cp->ip6c_icmp6->icmp6_type,
		             ip6cp->ip6c_icmp6->icmp6_code,
		             ntohl(ip6cp->ip6c_icmp6->icmp6_mtu));
#if defined(__Userspace__)
		if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) &&
		    (stcb->sctp_socket != NULL)) {
			struct socket *upcall_socket;

			upcall_socket = stcb->sctp_socket;
			SOCK_LOCK(upcall_socket);
			soref(upcall_socket);
			SOCK_UNLOCK(upcall_socket);
			if ((upcall_socket->so_upcall != NULL) &&
			    (upcall_socket->so_error != 0)) {
				(*upcall_socket->so_upcall)(upcall_socket, upcall_socket->so_upcallarg, M_NOWAIT);
			}
			ACCEPT_LOCK();
			SOCK_LOCK(upcall_socket);
			sorele(upcall_socket);
		}
#endif
	} else {
		if ((stcb == NULL) && (inp != NULL)) {
			/* reduce inp's ref-count */
			SCTP_INP_WLOCK(inp);
			SCTP_INP_DECR_REF(inp);
			SCTP_INP_WUNLOCK(inp);
		}
		if (stcb) {
			SCTP_TCB_UNLOCK(stcb);
		}
	}
}
}
#endif
#endif

/*
* this routine can probably be collapsed into the one in sctp_userreq.c
* since they do the same thing and now we lookup with a sockaddr
*/
#if defined(__FreeBSD__) && !defined(__Userspace__)
static int
sctp6_getcred(SYSCTL_HANDLER_ARGS)
{
struct xucred xuc;
struct sockaddr_in6 addrs[2];
struct sctp_inpcb *inp;
struct sctp_nets *net;
struct sctp_tcb *stcb;
int error;
uint32_t vrf_id;

vrf_id = SCTP_DEFAULT_VRFID;

#if defined(__FreeBSD__) && !defined(__Userspace__)
error = priv_check(req->td, PRIV_NETINET_GETCRED);
#else
error = suser(req->p);
#endif
if (error)
	return (error);

if (req->newlen != sizeof(addrs)) {
	SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
	return (EINVAL);
}
if (req->oldlen != sizeof(struct ucred)) {
	SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
	return (EINVAL);
}
error = SYSCTL_IN(req, addrs, sizeof(addrs));
if (error)
	return (error);

stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[1]),
    sin6tosa(&addrs[0]),
    &inp, &net, 1, vrf_id);
if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) {
	if ((inp != NULL) && (stcb == NULL)) {
		/* reduce ref-count */
		SCTP_INP_WLOCK(inp);
		SCTP_INP_DECR_REF(inp);
		goto cred_can_cont;
	}
	SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
	error = ENOENT;
	goto out;
}
SCTP_TCB_UNLOCK(stcb);
/* We use the write lock here, only
 * since in the error leg we need it.
 * If we used RLOCK, then we would have
 * to wlock/decr/unlock/rlock. Which
 * in theory could create a hole. Better
 * to use higher wlock.
 */
SCTP_INP_WLOCK(inp);
cred_can_cont:
error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket);
if (error) {
	SCTP_INP_WUNLOCK(inp);
	goto out;
}
cru2x(inp->sctp_socket->so_cred, &xuc);
SCTP_INP_WUNLOCK(inp);
error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
out:
return (error);
}

SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred,
   CTLTYPE_OPAQUE | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
   0, 0, sctp6_getcred, "S,ucred",
   "Get the ucred of a SCTP6 connection");
#endif

#if defined(__Userspace__)
int
sctp6_attach(struct socket *so, int proto SCTP_UNUSED, uint32_t vrf_id)
#elif defined(__FreeBSD__)
static int
sctp6_attach(struct socket *so, int proto SCTP_UNUSED, struct thread *p SCTP_UNUSED)
#elif defined(_WIN32)
static int
sctp6_attach(struct socket *so, int proto SCTP_UNUSED, PKTHREAD p SCTP_UNUSED)
#else
static int
sctp6_attach(struct socket *so, int proto SCTP_UNUSED, struct proc *p SCTP_UNUSED)
#endif
{
int error;
struct sctp_inpcb *inp;
#if !defined(__Userspace__)
uint32_t vrf_id = SCTP_DEFAULT_VRFID;
#endif

inp = (struct sctp_inpcb *)so->so_pcb;
if (inp != NULL) {
	SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
	return (EINVAL);
}

if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
	error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace));
	if (error)
		return (error);
}
error = sctp_inpcb_alloc(so, vrf_id);
if (error)
	return (error);
inp = (struct sctp_inpcb *)so->so_pcb;
SCTP_INP_WLOCK(inp);
inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6;	/* I'm v6! */

inp->ip_inp.inp.inp_vflag |= INP_IPV6;
inp->ip_inp.inp.in6p_hops = -1;	/* use kernel default */
inp->ip_inp.inp.in6p_cksum = -1;	/* just to be sure */
#ifdef INET
/*
 * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6
 * socket as well, because the socket may be bound to an IPv6
 * wildcard address, which may match an IPv4-mapped IPv6 address.
 */
inp->ip_inp.inp.inp_ip_ttl = MODULE_GLOBAL(ip_defttl);
#endif
SCTP_INP_WUNLOCK(inp);
return (0);
}

#if defined(__Userspace__)
int
sctp6_bind(struct socket *so, struct sockaddr *addr, void * p)
{
#elif defined(__FreeBSD__)
static int
sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p)
{
#elif defined(__APPLE__)
static int
sctp6_bind(struct socket *so, struct sockaddr *addr, struct proc *p)
{
#elif defined(_WIN32)
static int
sctp6_bind(struct socket *so, struct sockaddr *addr, PKTHREAD p)
{
#else
static int
sctp6_bind(struct socket *so, struct mbuf *nam, struct proc *p)
{
struct sockaddr *addr = nam ? mtod(nam, struct sockaddr *): NULL;

#endif
struct sctp_inpcb *inp;
int error;
u_char vflagsav;

inp = (struct sctp_inpcb *)so->so_pcb;
if (inp == NULL) {
	SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
	return (EINVAL);
}

#if !(defined(_WIN32) && !defined(__Userspace__))
if (addr) {
	switch (addr->sa_family) {
#ifdef INET
	case AF_INET:
#ifdef HAVE_SA_LEN
		if (addr->sa_len != sizeof(struct sockaddr_in)) {
			SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
			return (EINVAL);
		}
#endif
		break;
#endif
#ifdef INET6
	case AF_INET6:
#ifdef HAVE_SA_LEN
		if (addr->sa_len != sizeof(struct sockaddr_in6)) {
			SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
			return (EINVAL);
		}
#endif
		break;
#endif
	default:
		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
		return (EINVAL);
	}
}
#endif
vflagsav = inp->ip_inp.inp.inp_vflag;
inp->ip_inp.inp.inp_vflag &= ~INP_IPV4;
inp->ip_inp.inp.inp_vflag |= INP_IPV6;
if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp) == 0)) {
	switch (addr->sa_family) {
#ifdef INET
	case AF_INET:
		/* binding v4 addr to v6 socket, so reset flags */
		inp->ip_inp.inp.inp_vflag |= INP_IPV4;
		inp->ip_inp.inp.inp_vflag &= ~INP_IPV6;
		break;
#endif
#ifdef INET6
	case AF_INET6:
	{
		struct sockaddr_in6 *sin6_p;

		sin6_p = (struct sockaddr_in6 *)addr;

		if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
			inp->ip_inp.inp.inp_vflag |= INP_IPV4;
		}
#ifdef INET
		if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
			struct sockaddr_in sin;

			in6_sin6_2_sin(&sin, sin6_p);
			inp->ip_inp.inp.inp_vflag |= INP_IPV4;
			inp->ip_inp.inp.inp_vflag &= ~INP_IPV6;
			error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p);
			goto out;
		}
#endif
		break;
	}
#endif
	default:
		break;
	}
} else if (addr != NULL) {
	struct sockaddr_in6 *sin6_p;

	/* IPV6_V6ONLY socket */
#ifdef INET
	if (addr->sa_family == AF_INET) {
		/* can't bind v4 addr to v6 only socket! */
		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
		error = EINVAL;
		goto out;
	}
#endif
	sin6_p = (struct sockaddr_in6 *)addr;

	if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
		/* can't bind v4-mapped addrs either! */
		/* NOTE: we don't support SIIT */
		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
		error = EINVAL;
		goto out;
	}
}
error = sctp_inpcb_bind(so, addr, NULL, p);
out:
if (error != 0)
	inp->ip_inp.inp.inp_vflag = vflagsav;
return (error);
}

#if defined(__FreeBSD__) || defined(_WIN32) || defined(__Userspace__)
#if !defined(__Userspace__)
static void
#else
void
#endif
sctp6_close(struct socket *so)
{
sctp_close(so);
}

/* This could be made common with sctp_detach() since they are identical */
#else

static
int
sctp6_detach(struct socket *so)
{
#if defined(__Userspace__)
sctp_close(so);
return (0);
#else
return (sctp_detach(so));
#endif
}

#endif

int
#if defined(__FreeBSD__) && !defined(__Userspace__)
sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
   struct mbuf *control, struct thread *p);
#else
sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
   struct mbuf *control, struct proc *p);
#endif

#if !defined(_WIN32) && !defined(__Userspace__)
#if defined(__FreeBSD__)
static int
sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
   struct mbuf *control, struct thread *p)
{
#elif defined(__APPLE__)
static int
sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
   struct mbuf *control, struct proc *p)
{
#else
static int
sctp6_send(struct socket *so, int flags, struct mbuf *m, struct mbuf *nam,
   struct mbuf *control, struct proc *p)
{
struct sockaddr *addr = nam ? mtod(nam, struct sockaddr *): NULL;
#endif
struct sctp_inpcb *inp;

#ifdef INET
struct sockaddr_in6 *sin6;
#endif /* INET */
/* No SPL needed since sctp_output does this */

inp = (struct sctp_inpcb *)so->so_pcb;
if (inp == NULL) {
	if (control) {
		SCTP_RELEASE_PKT(control);
		control = NULL;
	}
	SCTP_RELEASE_PKT(m);
	SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
	return (EINVAL);
}
/*
 * For the TCP model we may get a NULL addr, if we are a connected
 * socket thats ok.
 */
if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) &&
    (addr == NULL)) {
	goto connected_type;
}
if (addr == NULL) {
	SCTP_RELEASE_PKT(m);
	if (control) {
		SCTP_RELEASE_PKT(control);
		control = NULL;
	}
	SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ);
	return (EDESTADDRREQ);
}
switch (addr->sa_family) {
#ifdef INET
case AF_INET:
#if defined(HAVE_SA_LEN)
	if (addr->sa_len != sizeof(struct sockaddr_in)) {
		if (control) {
			SCTP_RELEASE_PKT(control);
			control = NULL;
		}
		SCTP_RELEASE_PKT(m);
		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
		return (EINVAL);
	}
#endif
	break;
#endif
#ifdef INET6
case AF_INET6:
#if defined(HAVE_SA_LEN)
	if (addr->sa_len != sizeof(struct sockaddr_in6)) {
		if (control) {
			SCTP_RELEASE_PKT(control);
			control = NULL;
		}
		SCTP_RELEASE_PKT(m);
		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
		return (EINVAL);
	}
#endif
	break;
#endif
default:
	if (control) {
		SCTP_RELEASE_PKT(control);
		control = NULL;
	}
	SCTP_RELEASE_PKT(m);
	SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
	return (EINVAL);
}
#ifdef INET
sin6 = (struct sockaddr_in6 *)addr;
if (SCTP_IPV6_V6ONLY(inp)) {
	/*
	 * if IPV6_V6ONLY flag, we discard datagrams destined to a
	 * v4 addr or v4-mapped addr
	 */
	if (addr->sa_family == AF_INET) {
		if (control) {
			SCTP_RELEASE_PKT(control);
			control = NULL;
		}
		SCTP_RELEASE_PKT(m);
		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
		return (EINVAL);
	}
	if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
		if (control) {
			SCTP_RELEASE_PKT(control);
			control = NULL;
		}
		SCTP_RELEASE_PKT(m);
		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
		return (EINVAL);
	}
}
if ((addr->sa_family == AF_INET6) &&
    IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
	struct sockaddr_in sin;

	/* convert v4-mapped into v4 addr and send */
	in6_sin6_2_sin(&sin, sin6);
	return (sctp_sendm(so, flags, m, (struct sockaddr *)&sin, control, p));
}
#endif				/* INET */
connected_type:
/* now what about control */
if (control) {
	if (inp->control) {
		SCTP_PRINTF("huh? control set?\n");
		SCTP_RELEASE_PKT(inp->control);
		inp->control = NULL;
	}
	inp->control = control;
}
/* Place the data */
if (inp->pkt) {
	SCTP_BUF_NEXT(inp->pkt_last) = m;
	inp->pkt_last = m;
} else {
	inp->pkt_last = inp->pkt = m;
}
if (
#if (defined(__FreeBSD__) || defined(__APPLE__)) && !defined(__Userspace__)
/* FreeBSD and MacOSX uses a flag passed */
    ((flags & PRUS_MORETOCOME) == 0)
#else
    1			/* Open BSD does not have any "more to come"
			 * indication */
#endif
    ) {
	/*
	 * note with the current version this code will only be used
	 * by OpenBSD, NetBSD and FreeBSD have methods for
	 * re-defining sosend() to use sctp_sosend().  One can
	 * optionally switch back to this code (by changing back the
	 * definitions but this is not advisable.
	 */
#if defined(__FreeBSD__) && !defined(__Userspace__)
	struct epoch_tracker et;
#endif
	int ret;

#if defined(__FreeBSD__) && !defined(__Userspace__)
NET_EPOCH_ENTER(et);
#endif
	ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags);
#if defined(__FreeBSD__) && !defined(__Userspace__)
NET_EPOCH_EXIT(et);
#endif
	inp->pkt = NULL;
	inp->control = NULL;
	return (ret);
} else {
	return (0);
}
}
#endif

#if defined(__Userspace__)
int
sctp6_connect(struct socket *so, struct sockaddr *addr)
{
void *p = NULL;
#elif defined(__FreeBSD__)
static int
sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p)
{
#elif defined(__APPLE__)
static int
sctp6_connect(struct socket *so, struct sockaddr *addr, struct proc *p)
{
#elif defined(_WIN32)
static int
sctp6_connect(struct socket *so, struct sockaddr *addr, PKTHREAD p)
{
#else
static int
sctp6_connect(struct socket *so, struct mbuf *nam, struct proc *p)
{
struct sockaddr *addr = mtod(nam, struct sockaddr *);
#endif
#if defined(__FreeBSD__) && !defined(__Userspace__)
struct epoch_tracker et;
#endif
uint32_t vrf_id;
int error = 0;
struct sctp_inpcb *inp;
struct sctp_tcb *stcb;
#ifdef INET
struct sockaddr_in6 *sin6;
union sctp_sockstore store;
#endif

inp = (struct sctp_inpcb *)so->so_pcb;
if (inp == NULL) {
	SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
	return (ECONNRESET);	/* I made the same as TCP since we are
				 * not setup? */
}
if (addr == NULL) {
	SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
	return (EINVAL);
}
#if !(defined(_WIN32) && !defined(__Userspace__))
switch (addr->sa_family) {
#ifdef INET
case AF_INET:
#ifdef HAVE_SA_LEN
	if (addr->sa_len != sizeof(struct sockaddr_in)) {
		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
		return (EINVAL);
	}
#endif
	break;
#endif
#ifdef INET6
case AF_INET6:
#ifdef HAVE_SA_LEN
	if (addr->sa_len != sizeof(struct sockaddr_in6)) {
		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
		return (EINVAL);
	}
#endif
	break;
#endif
default:
	SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
	return (EINVAL);
}
#endif

vrf_id = inp->def_vrf_id;
SCTP_ASOC_CREATE_LOCK(inp);
SCTP_INP_RLOCK(inp);
if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) ==
    SCTP_PCB_FLAGS_UNBOUND) {
	/* Bind a ephemeral port */
	SCTP_INP_RUNLOCK(inp);
	error = sctp6_bind(so, NULL, p);
	if (error) {
		SCTP_ASOC_CREATE_UNLOCK(inp);

		return (error);
	}
	SCTP_INP_RLOCK(inp);
}
if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
    (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) {
	/* We are already connected AND the TCP model */
	SCTP_INP_RUNLOCK(inp);
	SCTP_ASOC_CREATE_UNLOCK(inp);
	SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE);
	return (EADDRINUSE);
}
#ifdef INET
sin6 = (struct sockaddr_in6 *)addr;
if (SCTP_IPV6_V6ONLY(inp)) {
	/*
	 * if IPV6_V6ONLY flag, ignore connections destined to a v4
	 * addr or v4-mapped addr
	 */
	if (addr->sa_family == AF_INET) {
		SCTP_INP_RUNLOCK(inp);
		SCTP_ASOC_CREATE_UNLOCK(inp);
		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
		return (EINVAL);
	}
	if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
		SCTP_INP_RUNLOCK(inp);
		SCTP_ASOC_CREATE_UNLOCK(inp);
		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
		return (EINVAL);
	}
}
if ((addr->sa_family == AF_INET6) &&
    IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
	/* convert v4-mapped into v4 addr */
	in6_sin6_2_sin(&store.sin, sin6);
	addr = &store.sa;
}
#endif				/* INET */
/* Now do we connect? */
if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
	stcb = LIST_FIRST(&inp->sctp_asoc_list);
	if (stcb) {
		SCTP_TCB_LOCK(stcb);
	}
	SCTP_INP_RUNLOCK(inp);
} else {
	SCTP_INP_RUNLOCK(inp);
	SCTP_INP_WLOCK(inp);
	SCTP_INP_INCR_REF(inp);
	SCTP_INP_WUNLOCK(inp);
	stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL);
	if (stcb == NULL) {
		SCTP_INP_WLOCK(inp);
		SCTP_INP_DECR_REF(inp);
		SCTP_INP_WUNLOCK(inp);
	}
}

if (stcb != NULL) {
	/* Already have or am bring up an association */
	SCTP_ASOC_CREATE_UNLOCK(inp);
	SCTP_TCB_UNLOCK(stcb);
	SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY);
	return (EALREADY);
}
/* We are GOOD to go */
stcb = sctp_aloc_assoc_connected(inp, addr, &error, 0, 0, vrf_id,
                                 inp->sctp_ep.pre_open_stream_count,
                                 inp->sctp_ep.port, p,
                                 SCTP_INITIALIZE_AUTH_PARAMS);
SCTP_ASOC_CREATE_UNLOCK(inp);
if (stcb == NULL) {
	/* Gak! no memory */
	return (error);
}
SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
(void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
#if defined(__FreeBSD__) && !defined(__Userspace__)
NET_EPOCH_ENTER(et);
#endif
sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
SCTP_TCB_UNLOCK(stcb);
#if defined(__FreeBSD__) && !defined(__Userspace__)
NET_EPOCH_EXIT(et);
#endif
return (error);
}

static int
#if !defined(__Userspace__)
sctp6_getaddr(struct socket *so, struct sockaddr **addr)
{
struct sockaddr_in6 *sin6;
#else
sctp6_getaddr(struct socket *so, struct mbuf *nam)
{
struct sockaddr_in6 *sin6 = mtod(nam, struct sockaddr_in6 *);
#endif
struct sctp_inpcb *inp;
uint32_t vrf_id;
struct sctp_ifa *sctp_ifa;

#if defined(SCTP_KAME) && defined(SCTP_EMBEDDED_V6_SCOPE)
int error;
#endif

/*
 * Do the malloc first in case it blocks.
 */
#if !defined(__Userspace__)
SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof(*sin6));
if (sin6 == NULL)
	return (ENOMEM);
#else
SCTP_BUF_LEN(nam) = sizeof(*sin6);
memset(sin6, 0, sizeof(*sin6));
#endif
sin6->sin6_family = AF_INET6;
#ifdef HAVE_SIN6_LEN
sin6->sin6_len = sizeof(*sin6);
#endif

inp = (struct sctp_inpcb *)so->so_pcb;
if (inp == NULL) {
#if !defined(__Userspace__)
	SCTP_FREE_SONAME(sin6);
#endif
	SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
	return (ECONNRESET);
}
SCTP_INP_RLOCK(inp);
sin6->sin6_port = inp->sctp_lport;
if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
	/* For the bound all case you get back 0 */
	if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
		struct sctp_tcb *stcb;
		struct sockaddr_in6 *sin_a6;
		struct sctp_nets *net;
		int fnd;
		stcb = LIST_FIRST(&inp->sctp_asoc_list);
		if (stcb == NULL) {
			SCTP_INP_RUNLOCK(inp);
#if !defined(__Userspace__)
			SCTP_FREE_SONAME(sin6);
#endif
			SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
			return (ENOENT);
		}
		fnd = 0;
		sin_a6 = NULL;
		TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
			sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
			if (sin_a6 == NULL)
				/* this will make coverity happy */
				continue;

			if (sin_a6->sin6_family == AF_INET6) {
				fnd = 1;
				break;
			}
		}
		if ((!fnd) || (sin_a6 == NULL)) {
			/* punt */
			SCTP_INP_RUNLOCK(inp);
#if !defined(__Userspace__)
			SCTP_FREE_SONAME(sin6);
#endif
			SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
			return (ENOENT);
		}
		vrf_id = inp->def_vrf_id;
		sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *)&net->ro, net, 0, vrf_id);
		if (sctp_ifa) {
			sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr;
		}
	} else {
		/* For the bound all case you get back 0 */
		memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr));
	}
} else {
	/* Take the first IPv6 address in the list */
	struct sctp_laddr *laddr;
	int fnd = 0;

	LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
		if (laddr->ifa->address.sa.sa_family == AF_INET6) {
			struct sockaddr_in6 *sin_a;

			sin_a = &laddr->ifa->address.sin6;
			sin6->sin6_addr = sin_a->sin6_addr;
			fnd = 1;
			break;
		}
	}
	if (!fnd) {
#if !defined(__Userspace__)
		SCTP_FREE_SONAME(sin6);
#endif
		SCTP_INP_RUNLOCK(inp);
		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
		return (ENOENT);
	}
}
SCTP_INP_RUNLOCK(inp);
/* Scoping things for v6 */
#ifdef SCTP_EMBEDDED_V6_SCOPE
#ifdef SCTP_KAME
if ((error = sa6_recoverscope(sin6)) != 0) {
	SCTP_FREE_SONAME(sin6);
	return (error);
}
#else
if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
	/* skip ifp check below */
	in6_recoverscope(sin6, &sin6->sin6_addr, NULL);
else
	sin6->sin6_scope_id = 0;	/* XXX */
#endif /* SCTP_KAME */
#endif /* SCTP_EMBEDDED_V6_SCOPE */
#if !defined(__Userspace__)
(*addr) = (struct sockaddr *)sin6;
#endif
return (0);
}

static int
#if !defined(__Userspace__)
sctp6_peeraddr(struct socket *so, struct sockaddr **addr)
{
struct sockaddr_in6 *sin6;
#else
sctp6_peeraddr(struct socket *so, struct mbuf *nam)
{
struct sockaddr_in6 *sin6 = mtod(nam, struct sockaddr_in6 *);
#endif
int fnd;
struct sockaddr_in6 *sin_a6;
struct sctp_inpcb *inp;
struct sctp_tcb *stcb;
struct sctp_nets *net;
#ifdef SCTP_KAME
int error;
#endif

/* Do the malloc first in case it blocks. */
#if !defined(__Userspace__)
SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
if (sin6 == NULL)
	return (ENOMEM);
#else
SCTP_BUF_LEN(nam) = sizeof(*sin6);
memset(sin6, 0, sizeof(*sin6));
#endif
sin6->sin6_family = AF_INET6;
#ifdef HAVE_SIN6_LEN
sin6->sin6_len = sizeof(*sin6);
#endif

inp = (struct sctp_inpcb *)so->so_pcb;
if ((inp == NULL) ||
    ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
	/* UDP type and listeners will drop out here */
#if !defined(__Userspace__)
	SCTP_FREE_SONAME(sin6);
#endif
	SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN);
	return (ENOTCONN);
}
SCTP_INP_RLOCK(inp);
stcb = LIST_FIRST(&inp->sctp_asoc_list);
if (stcb) {
	SCTP_TCB_LOCK(stcb);
}
SCTP_INP_RUNLOCK(inp);
if (stcb == NULL) {
#if !defined(__Userspace__)
	SCTP_FREE_SONAME(sin6);
#endif
	SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
	return (ECONNRESET);
}
fnd = 0;
TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
	sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
	if (sin_a6->sin6_family == AF_INET6) {
		fnd = 1;
		sin6->sin6_port = stcb->rport;
		sin6->sin6_addr = sin_a6->sin6_addr;
		break;
	}
}
SCTP_TCB_UNLOCK(stcb);
if (!fnd) {
	/* No IPv4 address */
#if !defined(__Userspace__)
	SCTP_FREE_SONAME(sin6);
#endif
	SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
	return (ENOENT);
}
#ifdef SCTP_EMBEDDED_V6_SCOPE
#ifdef SCTP_KAME
if ((error = sa6_recoverscope(sin6)) != 0) {
#if !defined(__Userspace__)
	SCTP_FREE_SONAME(sin6);
#endif
	SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, error);
	return (error);
}
#else
in6_recoverscope(sin6, &sin6->sin6_addr, NULL);
#endif /* SCTP_KAME */
#endif /* SCTP_EMBEDDED_V6_SCOPE */
#if !defined(__Userspace__)
*addr = (struct sockaddr *)sin6;
#endif
return (0);
}

#if !defined(__Userspace__)
static int
sctp6_in6getaddr(struct socket *so, struct sockaddr **nam)
{
#elif defined(__Userspace__)
int
sctp6_in6getaddr(struct socket *so, struct mbuf *nam)
{
#ifdef INET
struct sockaddr *addr = mtod(nam, struct sockaddr *);
#endif
#else
static int
sctp6_in6getaddr(struct socket *so, struct mbuf *nam)
{
#ifdef INET
struct sockaddr *addr = mtod(nam, struct sockaddr *);
#endif
#endif
struct inpcb *inp = sotoinpcb(so);
int error;

if (inp == NULL) {
	SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
	return (EINVAL);
}

/* allow v6 addresses precedence */
error = sctp6_getaddr(so, nam);
#ifdef INET
if (error) {
#if !defined(__Userspace__)
	struct sockaddr_in6 *sin6;
#else
	struct sockaddr_in6 sin6;
#endif

	/* try v4 next if v6 failed */
	error = sctp_ingetaddr(so, nam);
	if (error) {
		return (error);
	}
#if !defined(__Userspace__)
	SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
	if (sin6 == NULL) {
		SCTP_FREE_SONAME(*nam);
		return (ENOMEM);
	}
	in6_sin_2_v4mapsin6((struct sockaddr_in *)*nam, sin6);
	SCTP_FREE_SONAME(*nam);
	*nam = (struct sockaddr *)sin6;
#else
	in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6);
	SCTP_BUF_LEN(nam) = sizeof(struct sockaddr_in6);
	memcpy(addr, &sin6, sizeof(struct sockaddr_in6));
#endif
}
#endif
return (error);
}

#if !defined(__Userspace__)
static int
sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam)
{
#elif defined(__Userspace__)
int
sctp6_getpeeraddr(struct socket *so, struct mbuf *nam)
{
#ifdef INET
struct sockaddr *addr = mtod(nam, struct sockaddr *);
#endif
#else
static
int
sctp6_getpeeraddr(struct socket *so, struct mbuf *nam)
{
#ifdef INET
struct sockaddr *addr = mtod(nam, struct sockaddr *);
#endif

#endif
struct inpcb *inp = sotoinpcb(so);
int error;

if (inp == NULL) {
	SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
	return (EINVAL);
}

/* allow v6 addresses precedence */
error = sctp6_peeraddr(so, nam);
#ifdef INET
if (error) {
#if !defined(__Userspace__)
	struct sockaddr_in6 *sin6;
#else
	struct sockaddr_in6 sin6;
#endif

	/* try v4 next if v6 failed */
	error = sctp_peeraddr(so, nam);
	if (error) {
		return (error);
	}
#if !defined(__Userspace__)
	SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
	if (sin6 == NULL) {
		SCTP_FREE_SONAME(*nam);
		return (ENOMEM);
	}
	in6_sin_2_v4mapsin6((struct sockaddr_in *)*nam, sin6);
	SCTP_FREE_SONAME(*nam);
	*nam = (struct sockaddr *)sin6;
#else
	in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6);
	SCTP_BUF_LEN(nam) = sizeof(struct sockaddr_in6);
	memcpy(addr, &sin6, sizeof(struct sockaddr_in6));
#endif
}
#endif
return (error);
}

#if !defined(__Userspace__)
#if defined(__FreeBSD__)
#define	SCTP6_PROTOSW							\
.pr_protocol =	IPPROTO_SCTP,					\
.pr_ctloutput =	sctp_ctloutput,					\
.pr_abort =	sctp_abort,					\
.pr_accept =	sctp_accept,					\
.pr_attach =	sctp6_attach,					\
.pr_bind =	sctp6_bind,					\
.pr_connect =	sctp6_connect,					\
.pr_control =	in6_control,					\
.pr_close =	sctp6_close,					\
.pr_detach =	sctp6_close,					\
.pr_sopoll =	sopoll_generic,					\
.pr_flush =	sctp_flush,					\
.pr_disconnect = sctp_disconnect,				\
.pr_listen =	sctp_listen,					\
.pr_peeraddr =	sctp6_getpeeraddr,				\
.pr_send =	sctp6_send,					\
.pr_shutdown =	sctp_shutdown,					\
.pr_sockaddr =	sctp6_in6getaddr,				\
.pr_sosend =	sctp_sosend,					\
.pr_soreceive =	sctp_soreceive

struct protosw sctp6_seqpacket_protosw = {
.pr_type = SOCK_SEQPACKET,
.pr_flags = PR_WANTRCVD,
SCTP6_PROTOSW
};

struct protosw sctp6_stream_protosw = {
.pr_type = SOCK_STREAM,
.pr_flags = PR_CONNREQUIRED | PR_WANTRCVD,
SCTP6_PROTOSW
};
#else
struct pr_usrreqs sctp6_usrreqs = {
#if defined(__APPLE__) && !defined(__Userspace__)
.pru_abort = sctp_abort,
.pru_accept = sctp_accept,
.pru_attach = sctp6_attach,
.pru_bind = sctp6_bind,
.pru_connect = sctp6_connect,
.pru_connect2 = pru_connect2_notsupp,
.pru_control = in6_control,
.pru_detach = sctp6_detach,
.pru_disconnect = sctp_disconnect,
.pru_listen = sctp_listen,
.pru_peeraddr = sctp6_getpeeraddr,
.pru_rcvd = NULL,
.pru_rcvoob = pru_rcvoob_notsupp,
.pru_send = sctp6_send,
.pru_sense = pru_sense_null,
.pru_shutdown = sctp_shutdown,
.pru_sockaddr = sctp6_in6getaddr,
.pru_sosend = sctp_sosend,
.pru_soreceive = sctp_soreceive,
.pru_sopoll = sopoll
#elif defined(_WIN32) && !defined(__Userspace__)
sctp_abort,
sctp_accept,
sctp6_attach,
sctp6_bind,
sctp6_connect,
pru_connect2_notsupp,
NULL,
NULL,
sctp_disconnect,
sctp_listen,
sctp6_getpeeraddr,
NULL,
pru_rcvoob_notsupp,
NULL,
pru_sense_null,
sctp_shutdown,
sctp_flush,
sctp6_in6getaddr,
sctp_sosend,
sctp_soreceive,
sopoll_generic,
NULL,
sctp6_close
};
#endif
#endif
#endif
#endif