tor-browser

sctp_timer.c (51008B)

---

/*-
* 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.
*/

#define _IP_VHL
#include <netinet/sctp_os.h>
#include <netinet/sctp_pcb.h>
#ifdef INET6
#if defined(__FreeBSD__) && defined(__Userspace__)
#include <netinet6/sctp6_var.h>
#endif
#endif
#include <netinet/sctp_var.h>
#include <netinet/sctp_sysctl.h>
#include <netinet/sctp_timer.h>
#include <netinet/sctputil.h>
#include <netinet/sctp_output.h>
#include <netinet/sctp_header.h>
#include <netinet/sctp_indata.h>
#include <netinet/sctp_asconf.h>
#include <netinet/sctp_input.h>
#include <netinet/sctp.h>
#include <netinet/sctp_uio.h>
#if defined(INET) || defined(INET6)
#if !(defined(_WIN32) && defined(__Userspace__))
#include <netinet/udp.h>
#endif
#endif

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

SCTPDBG(SCTP_DEBUG_TIMER4, "Audit invoked on send queue cnt:%d onqueue:%d\n",
		asoc->sent_queue_retran_cnt,
		asoc->sent_queue_cnt);
asoc->sent_queue_retran_cnt = 0;
asoc->sent_queue_cnt = 0;
TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
	if (chk->sent == SCTP_DATAGRAM_RESEND) {
		sctp_ucount_incr(asoc->sent_queue_retran_cnt);
	}
	asoc->sent_queue_cnt++;
}
TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
	if (chk->sent == SCTP_DATAGRAM_RESEND) {
		sctp_ucount_incr(asoc->sent_queue_retran_cnt);
	}
}
TAILQ_FOREACH(chk, &asoc->asconf_send_queue, sctp_next) {
	if (chk->sent == SCTP_DATAGRAM_RESEND) {
		sctp_ucount_incr(asoc->sent_queue_retran_cnt);
	}
}
SCTPDBG(SCTP_DEBUG_TIMER4, "Audit completes retran:%d onqueue:%d\n",
	asoc->sent_queue_retran_cnt,
	asoc->sent_queue_cnt);
}

static int
sctp_threshold_management(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
   struct sctp_nets *net, uint16_t threshold)
{
KASSERT(stcb != NULL, ("stcb is NULL"));
SCTP_TCB_LOCK_ASSERT(stcb);

if (net != NULL) {
	net->error_count++;
	SCTPDBG(SCTP_DEBUG_TIMER4, "Error count for %p now %d thresh:%d\n",
		(void *)net, net->error_count,
		net->failure_threshold);
	if (net->error_count > net->failure_threshold) {
		/* We had a threshold failure */
		if (net->dest_state & SCTP_ADDR_REACHABLE) {
			net->dest_state &= ~SCTP_ADDR_REACHABLE;
			net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
			net->dest_state &= ~SCTP_ADDR_PF;
			sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
			    stcb, 0,
			    (void *)net, SCTP_SO_NOT_LOCKED);
		}
	} else if ((net->pf_threshold < net->failure_threshold) &&
	           (net->error_count > net->pf_threshold)) {
		if ((net->dest_state & SCTP_ADDR_PF) == 0) {
			net->dest_state |= SCTP_ADDR_PF;
			net->last_active = sctp_get_tick_count();
			sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
			sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT,
			                inp, stcb, net,
			                SCTP_FROM_SCTP_TIMER + SCTP_LOC_1);
			sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net);
		}
	}
	if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0) {
		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
			sctp_misc_ints(SCTP_THRESHOLD_INCR,
			               stcb->asoc.overall_error_count,
			               (stcb->asoc.overall_error_count+1),
			               SCTP_FROM_SCTP_TIMER,
			               __LINE__);
		}
		stcb->asoc.overall_error_count++;
	}
} else {
	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
		sctp_misc_ints(SCTP_THRESHOLD_INCR,
		               stcb->asoc.overall_error_count,
		               (stcb->asoc.overall_error_count+1),
		               SCTP_FROM_SCTP_TIMER,
		               __LINE__);
	}
	stcb->asoc.overall_error_count++;
}
SCTPDBG(SCTP_DEBUG_TIMER4, "Overall error count for %p now %d thresh:%u state:%x\n",
	(void *)&stcb->asoc, stcb->asoc.overall_error_count,
	(uint32_t)threshold,
	((net == NULL) ? (uint32_t) 0 : (uint32_t) net->dest_state));
/*
 * We specifically do not do >= to give the assoc one more change
 * before we fail it.
 */
if (stcb->asoc.overall_error_count > threshold) {
	/* Abort notification sends a ULP notify */
	struct mbuf *op_err;

	op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
	                             "Association error counter exceeded");
	inp->last_abort_code = SCTP_FROM_SCTP_TIMER + SCTP_LOC_2;
	sctp_abort_an_association(inp, stcb, op_err, true, SCTP_SO_NOT_LOCKED);
	return (1);
}
return (0);
}

/*
* sctp_find_alternate_net() returns a non-NULL pointer as long as there
* exists nets, which are not being deleted.
*/
struct sctp_nets *
sctp_find_alternate_net(struct sctp_tcb *stcb,
   struct sctp_nets *net,
   int mode)
{
/* Find and return an alternate network if possible */
struct sctp_nets *alt, *mnet, *min_errors_net = NULL , *max_cwnd_net = NULL;
bool looped;
/* JRS 5/14/07 - Initialize min_errors to an impossible value. */
int min_errors = -1;
uint32_t max_cwnd = 0;

if (stcb->asoc.numnets == 1) {
	/* No selection can be made. */
	return (TAILQ_FIRST(&stcb->asoc.nets));
}
/*
 * JRS 5/14/07 - If mode is set to 2, use the CMT PF find alternate net algorithm.
 * This algorithm chooses the active destination (not in PF state) with the largest
 * cwnd value. If all destinations are in PF state, unreachable, or unconfirmed, choose
 * the destination that is in PF state with the lowest error count. In case of a tie,
 * choose the destination that was most recently active.
 */
if (mode == 2) {
	TAILQ_FOREACH(mnet, &stcb->asoc.nets, sctp_next) {
		/* JRS 5/14/07 - If the destination is unreachable or unconfirmed, skip it. */
		if (((mnet->dest_state & SCTP_ADDR_REACHABLE) != SCTP_ADDR_REACHABLE) ||
		    (mnet->dest_state & SCTP_ADDR_UNCONFIRMED)) {
			continue;
		}
		/*
		 * JRS 5/14/07 -  If the destination is reachable but in PF state, compare
		 *  the error count of the destination to the minimum error count seen thus far.
		 *  Store the destination with the lower error count.  If the error counts are
		 *  equal, store the destination that was most recently active.
		 */
		if (mnet->dest_state & SCTP_ADDR_PF) {
			/*
			 * JRS 5/14/07 - If the destination under consideration is the current
			 *  destination, work as if the error count is one higher.  The
			 *  actual error count will not be incremented until later in the
			 *  t3 handler.
			 */
			if (mnet == net) {
				if (min_errors == -1) {
					min_errors = mnet->error_count + 1;
					min_errors_net = mnet;
				} else if (mnet->error_count + 1 < min_errors) {
					min_errors = mnet->error_count + 1;
					min_errors_net = mnet;
				} else if (mnet->error_count + 1 == min_errors
							&& mnet->last_active > min_errors_net->last_active) {
					min_errors_net = mnet;
					min_errors = mnet->error_count + 1;
				}
				continue;
			} else {
				if (min_errors == -1) {
					min_errors = mnet->error_count;
					min_errors_net = mnet;
				} else if (mnet->error_count < min_errors) {
					min_errors = mnet->error_count;
					min_errors_net = mnet;
				} else if (mnet->error_count == min_errors
							&& mnet->last_active > min_errors_net->last_active) {
					min_errors_net = mnet;
					min_errors = mnet->error_count;
				}
				continue;
			}
		}
		/*
		 * JRS 5/14/07 - If the destination is reachable and not in PF state, compare the
		 *  cwnd of the destination to the highest cwnd seen thus far.  Store the
		 *  destination with the higher cwnd value.  If the cwnd values are equal,
		 *  randomly choose one of the two destinations.
		 */
		if (max_cwnd < mnet->cwnd) {
			max_cwnd_net = mnet;
			max_cwnd = mnet->cwnd;
		} else if (max_cwnd == mnet->cwnd) {
			uint32_t rndval;
			uint8_t this_random;

			if (stcb->asoc.hb_random_idx > 3) {
				rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
				memcpy(stcb->asoc.hb_random_values, &rndval, sizeof(stcb->asoc.hb_random_values));
				this_random = stcb->asoc.hb_random_values[0];
				stcb->asoc.hb_random_idx++;
				stcb->asoc.hb_ect_randombit = 0;
			} else {
				this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
				stcb->asoc.hb_random_idx++;
				stcb->asoc.hb_ect_randombit = 0;
			}
			if (this_random % 2 == 1) {
				max_cwnd_net = mnet;
				max_cwnd = mnet->cwnd; /* Useless? */
			}
		}
	}
	if (max_cwnd_net == NULL) {
		if (min_errors_net == NULL) {
			return (net);
		}
		return (min_errors_net);
	} else {
		return (max_cwnd_net);
	}
} /* JRS 5/14/07 - If mode is set to 1, use the CMT policy for choosing an alternate net. */
else if (mode == 1) {
	TAILQ_FOREACH(mnet, &stcb->asoc.nets, sctp_next) {
		if (((mnet->dest_state & SCTP_ADDR_REACHABLE) != SCTP_ADDR_REACHABLE) ||
		    (mnet->dest_state & SCTP_ADDR_UNCONFIRMED)) {
			/*
			 * will skip ones that are not-reachable or
			 * unconfirmed
			 */
			continue;
		}
		if (max_cwnd < mnet->cwnd) {
			max_cwnd_net = mnet;
			max_cwnd = mnet->cwnd;
		} else if (max_cwnd == mnet->cwnd) {
			uint32_t rndval;
			uint8_t this_random;

			if (stcb->asoc.hb_random_idx > 3) {
				rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
				memcpy(stcb->asoc.hb_random_values, &rndval,
				    sizeof(stcb->asoc.hb_random_values));
				this_random = stcb->asoc.hb_random_values[0];
				stcb->asoc.hb_random_idx = 0;
				stcb->asoc.hb_ect_randombit = 0;
			} else {
				this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
				stcb->asoc.hb_random_idx++;
				stcb->asoc.hb_ect_randombit = 0;
			}
			if (this_random % 2) {
				max_cwnd_net = mnet;
				max_cwnd = mnet->cwnd;
			}
		}
	}
	if (max_cwnd_net) {
		return (max_cwnd_net);
	}
}
/* Look for an alternate net, which is active. */
if ((net != NULL) && ((net->dest_state & SCTP_ADDR_BEING_DELETED) == 0)) {
	alt = TAILQ_NEXT(net, sctp_next);
} else {
	alt = TAILQ_FIRST(&stcb->asoc.nets);
}
looped = false;
for (;;) {
	if (alt == NULL) {
		if (!looped) {
			alt = TAILQ_FIRST(&stcb->asoc.nets);
			looped = true;
		}
		/* Definitely out of candidates. */
		if (alt == NULL) {
			break;
		}
	}
#if defined(__FreeBSD__) && !defined(__Userspace__)
	if (alt->ro.ro_nh == NULL) {
#else
	if (alt->ro.ro_rt == NULL) {
#endif
		if (alt->ro._s_addr) {
			sctp_free_ifa(alt->ro._s_addr);
			alt->ro._s_addr = NULL;
		}
		alt->src_addr_selected = 0;
	}
	if (((alt->dest_state & SCTP_ADDR_REACHABLE) == SCTP_ADDR_REACHABLE) &&
#if defined(__FreeBSD__) && !defined(__Userspace__)
	    (alt->ro.ro_nh != NULL) &&
#else
	    (alt->ro.ro_rt != NULL) &&
#endif
	    ((alt->dest_state & SCTP_ADDR_UNCONFIRMED) == 0) &&
	    (alt != net)) {
		/* Found an alternate net, which is reachable. */
		break;
	}
	alt = TAILQ_NEXT(alt, sctp_next);
}

if (alt == NULL) {
	/*
	 * In case no active alternate net has been found, look for
	 * an alternate net, which is confirmed.
	 */
	if ((net != NULL) && ((net->dest_state & SCTP_ADDR_BEING_DELETED) == 0)) {
		alt = TAILQ_NEXT(net, sctp_next);
	} else {
		alt = TAILQ_FIRST(&stcb->asoc.nets);
	}
	looped = false;
	for (;;) {
		if (alt == NULL) {
			if (!looped) {
				alt = TAILQ_FIRST(&stcb->asoc.nets);
				looped = true;
			}
			/* Definitely out of candidates. */
			if (alt == NULL) {
				break;
			}
		}
		if (((alt->dest_state & SCTP_ADDR_UNCONFIRMED) == 0) &&
		    (alt != net)) {
			/* Found an alternate net, which is confirmed. */
			break;
		}
		alt = TAILQ_NEXT(alt, sctp_next);
	}
}
if (alt == NULL) {
	/*
	 * In case no confirmed alternate net has been found, just
	 * return net, if it is not being deleted. In the other case
	 * just return the first net.
	 */
	if ((net != NULL) && ((net->dest_state & SCTP_ADDR_BEING_DELETED) == 0)) {
		alt = net;
	}
	if (alt == NULL) {
		alt = TAILQ_FIRST(&stcb->asoc.nets);
	}
}
return (alt);
}

static void
sctp_backoff_on_timeout(struct sctp_tcb *stcb,
   struct sctp_nets *net,
   int win_probe,
   int num_marked, int num_abandoned)
{
if (net->RTO == 0) {
	if (net->RTO_measured) {
		net->RTO = stcb->asoc.minrto;
	} else {
		net->RTO = stcb->asoc.initial_rto;
	}
}
net->RTO <<= 1;
if (net->RTO > stcb->asoc.maxrto) {
	net->RTO = stcb->asoc.maxrto;
}
if ((win_probe == 0) && (num_marked || num_abandoned)) {
	/* We don't apply penalty to window probe scenarios */
	/* JRS - Use the congestion control given in the CC module */
	stcb->asoc.cc_functions.sctp_cwnd_update_after_timeout(stcb, net);
}
}

#ifndef INVARIANTS
static void
sctp_recover_sent_list(struct sctp_tcb *stcb)
{
struct sctp_tmit_chunk *chk, *nchk;
struct sctp_association *asoc;

asoc = &stcb->asoc;
TAILQ_FOREACH_SAFE(chk, &asoc->sent_queue, sctp_next, nchk) {
	if (SCTP_TSN_GE(asoc->last_acked_seq, chk->rec.data.tsn)) {
		SCTP_PRINTF("Found chk:%p tsn:%x <= last_acked_seq:%x\n",
		            (void *)chk, chk->rec.data.tsn, asoc->last_acked_seq);
		if (chk->sent != SCTP_DATAGRAM_NR_ACKED) {
			if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) {
				asoc->strmout[chk->rec.data.sid].chunks_on_queues--;
			}
		}
		if ((asoc->strmout[chk->rec.data.sid].chunks_on_queues == 0) &&
		    (asoc->strmout[chk->rec.data.sid].state == SCTP_STREAM_RESET_PENDING) &&
		    TAILQ_EMPTY(&asoc->strmout[chk->rec.data.sid].outqueue)) {
			asoc->trigger_reset = 1;
		}
		TAILQ_REMOVE(&asoc->sent_queue, chk, sctp_next);
		if (PR_SCTP_ENABLED(chk->flags)) {
			if (asoc->pr_sctp_cnt != 0)
				asoc->pr_sctp_cnt--;
		}
		if (chk->data) {
			/*sa_ignore NO_NULL_CHK*/
			sctp_free_bufspace(stcb, asoc, chk, 1);
			sctp_m_freem(chk->data);
			chk->data = NULL;
			if (asoc->prsctp_supported && PR_SCTP_BUF_ENABLED(chk->flags)) {
				asoc->sent_queue_cnt_removeable--;
			}
		}
		asoc->sent_queue_cnt--;
		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
	}
}
SCTP_PRINTF("after recover order is as follows\n");
TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
	SCTP_PRINTF("chk:%p TSN:%x\n", (void *)chk, chk->rec.data.tsn);
}
}
#endif

static int
sctp_mark_all_for_resend(struct sctp_tcb *stcb,
   struct sctp_nets *net,
   struct sctp_nets *alt,
   int window_probe,
   int *num_marked,
   int *num_abandoned)
{

/*
 * Mark all chunks (well not all) that were sent to *net for
 * retransmission. Move them to alt for there destination as well...
 * We only mark chunks that have been outstanding long enough to
 * have received feed-back.
 */
struct sctp_tmit_chunk *chk, *nchk;
struct sctp_nets *lnets;
struct timeval now, min_wait, tv;
int cur_rto;
int cnt_abandoned;
int audit_tf, num_mk, fir;
unsigned int cnt_mk;
uint32_t orig_flight, orig_tf;
uint32_t tsnlast, tsnfirst;
#ifndef INVARIANTS
int recovery_cnt = 0;
#endif

/* none in flight now */
audit_tf = 0;
fir = 0;
/*
 * figure out how long a data chunk must be pending before we can
 * mark it ..
 */
(void)SCTP_GETTIME_TIMEVAL(&now);
/* get cur rto in micro-seconds */
cur_rto = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv;
cur_rto *= 1000;
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
	sctp_log_fr(cur_rto,
		    stcb->asoc.peers_rwnd,
		    window_probe,
		    SCTP_FR_T3_MARK_TIME);
	sctp_log_fr(net->flight_size, 0, 0, SCTP_FR_CWND_REPORT);
	sctp_log_fr(net->flight_size, net->cwnd, stcb->asoc.total_flight, SCTP_FR_CWND_REPORT);
}
tv.tv_sec = cur_rto / 1000000;
tv.tv_usec = cur_rto % 1000000;
#if !(defined(__FreeBSD__) && !defined(__Userspace__))
timersub(&now, &tv, &min_wait);
#else
min_wait = now;
timevalsub(&min_wait, &tv);
#endif
if (min_wait.tv_sec < 0 || min_wait.tv_usec < 0) {
	/*
	 * if we hit here, we don't have enough seconds on the clock
	 * to account for the RTO. We just let the lower seconds be
	 * the bounds and don't worry about it. This may mean we
	 * will mark a lot more than we should.
	 */
	min_wait.tv_sec = min_wait.tv_usec = 0;
}
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
	sctp_log_fr(cur_rto, (uint32_t)now.tv_sec, now.tv_usec, SCTP_FR_T3_MARK_TIME);
	sctp_log_fr(0, (uint32_t)min_wait.tv_sec, min_wait.tv_usec, SCTP_FR_T3_MARK_TIME);
}
/*
 * Our rwnd will be incorrect here since we are not adding back the
 * cnt * mbuf but we will fix that down below.
 */
orig_flight = net->flight_size;
orig_tf = stcb->asoc.total_flight;

net->fast_retran_ip = 0;
/* Now on to each chunk */
cnt_abandoned = 0;
num_mk = cnt_mk = 0;
tsnfirst = tsnlast = 0;
#ifndef INVARIANTS
start_again:
#endif
TAILQ_FOREACH_SAFE(chk, &stcb->asoc.sent_queue, sctp_next, nchk) {
	if (SCTP_TSN_GE(stcb->asoc.last_acked_seq, chk->rec.data.tsn)) {
		/* Strange case our list got out of order? */
		SCTP_PRINTF("Our list is out of order? last_acked:%x chk:%x\n",
		            (unsigned int)stcb->asoc.last_acked_seq, (unsigned int)chk->rec.data.tsn);
#ifdef INVARIANTS
		panic("last acked >= chk on sent-Q");
#else
		recovery_cnt++;
		SCTP_PRINTF("Recover attempts a restart cnt:%d\n", recovery_cnt);
		sctp_recover_sent_list(stcb);
		if (recovery_cnt < 10) {
			goto start_again;
		} else {
			SCTP_PRINTF("Recovery fails %d times??\n", recovery_cnt);
		}
#endif
	}
	if ((chk->whoTo == net) && (chk->sent < SCTP_DATAGRAM_ACKED)) {
		/*
		 * found one to mark: If it is less than
		 * DATAGRAM_ACKED it MUST not be a skipped or marked
		 * TSN but instead one that is either already set
		 * for retransmission OR one that needs
		 * retransmission.
		 */

		/* validate its been outstanding long enough */
		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
			sctp_log_fr(chk->rec.data.tsn,
				    (uint32_t)chk->sent_rcv_time.tv_sec,
				    chk->sent_rcv_time.tv_usec,
				    SCTP_FR_T3_MARK_TIME);
		}
		if ((chk->sent_rcv_time.tv_sec > min_wait.tv_sec) && (window_probe == 0)) {
			/*
			 * we have reached a chunk that was sent
			 * some seconds past our min.. forget it we
			 * will find no more to send.
			 */
			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
				sctp_log_fr(0,
					    (uint32_t)chk->sent_rcv_time.tv_sec,
					    chk->sent_rcv_time.tv_usec,
					    SCTP_FR_T3_STOPPED);
			}
			continue;
		} else if ((chk->sent_rcv_time.tv_sec == min_wait.tv_sec) &&
			   (window_probe == 0)) {
			/*
			 * we must look at the micro seconds to
			 * know.
			 */
			if (chk->sent_rcv_time.tv_usec >= min_wait.tv_usec) {
				/*
				 * ok it was sent after our boundary
				 * time.
				 */
				continue;
			}
		}
		if (stcb->asoc.prsctp_supported && PR_SCTP_TTL_ENABLED(chk->flags)) {
			/* Is it expired? */
#if !(defined(__FreeBSD__) && !defined(__Userspace__))
			if (timercmp(&now, &chk->rec.data.timetodrop, >)) {
#else
			if (timevalcmp(&now, &chk->rec.data.timetodrop, >)) {
#endif
				/* Yes so drop it */
				if (chk->data) {
					(void)sctp_release_pr_sctp_chunk(stcb,
									 chk,
									 1,
									 SCTP_SO_NOT_LOCKED);
					cnt_abandoned++;
				}
				continue;
			}
		}
		if (stcb->asoc.prsctp_supported && PR_SCTP_RTX_ENABLED(chk->flags)) {
			/* Has it been retransmitted tv_sec times? */
			if (chk->snd_count > chk->rec.data.timetodrop.tv_sec) {
				if (chk->data) {
					(void)sctp_release_pr_sctp_chunk(stcb,
									 chk,
									 1,
									 SCTP_SO_NOT_LOCKED);
					cnt_abandoned++;
				}
				continue;
			}
		}
		if (chk->sent < SCTP_DATAGRAM_RESEND) {
			sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
			num_mk++;
			if (fir == 0) {
				fir = 1;
				tsnfirst = chk->rec.data.tsn;
			}
			tsnlast = chk->rec.data.tsn;
			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
				sctp_log_fr(chk->rec.data.tsn, chk->snd_count,
					    0, SCTP_FR_T3_MARKED);
			}

			if (chk->rec.data.chunk_was_revoked) {
				/* deflate the cwnd */
				chk->whoTo->cwnd -= chk->book_size;
				chk->rec.data.chunk_was_revoked = 0;
			}
			net->marked_retrans++;
			stcb->asoc.marked_retrans++;
			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
				sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_RSND_TO,
					       chk->whoTo->flight_size,
					       chk->book_size,
					       (uint32_t)(uintptr_t)chk->whoTo,
					       chk->rec.data.tsn);
			}
			sctp_flight_size_decrease(chk);
			sctp_total_flight_decrease(stcb, chk);
			stcb->asoc.peers_rwnd += chk->send_size;
			stcb->asoc.peers_rwnd += SCTP_BASE_SYSCTL(sctp_peer_chunk_oh);
		}
		chk->sent = SCTP_DATAGRAM_RESEND;
		chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
		SCTP_STAT_INCR(sctps_markedretrans);

		/* reset the TSN for striking and other FR stuff */
		chk->rec.data.doing_fast_retransmit = 0;
		/* Clear any time so NO RTT is being done */

		if (chk->do_rtt) {
			if (chk->whoTo->rto_needed == 0) {
				chk->whoTo->rto_needed = 1;
			}
		}
		chk->do_rtt = 0;
		if (alt != net) {
			sctp_free_remote_addr(chk->whoTo);
			chk->no_fr_allowed = 1;
			chk->whoTo = alt;
			atomic_add_int(&alt->ref_count, 1);
		} else {
			chk->no_fr_allowed = 0;
			if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
				chk->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
			} else {
				chk->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn;
			}
		}
		/* CMT: Do not allow FRs on retransmitted TSNs.
		 */
		if (stcb->asoc.sctp_cmt_on_off > 0) {
			chk->no_fr_allowed = 1;
		}
#ifdef THIS_SHOULD_NOT_BE_DONE
	} else if (chk->sent == SCTP_DATAGRAM_ACKED) {
		/* remember highest acked one */
		could_be_sent = chk;
#endif
	}
	if (chk->sent == SCTP_DATAGRAM_RESEND) {
		cnt_mk++;
	}
}
if ((orig_flight - net->flight_size) != (orig_tf - stcb->asoc.total_flight)) {
	/* we did not subtract the same things? */
	audit_tf = 1;
}

if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
	sctp_log_fr(tsnfirst, tsnlast, num_mk, SCTP_FR_T3_TIMEOUT);
}
#ifdef SCTP_DEBUG
if (num_mk) {
	SCTPDBG(SCTP_DEBUG_TIMER1, "LAST TSN marked was %x\n",
		tsnlast);
	SCTPDBG(SCTP_DEBUG_TIMER1, "Num marked for retransmission was %d peer-rwd:%u\n",
		num_mk,
		stcb->asoc.peers_rwnd);
}
#endif
*num_marked = num_mk;
*num_abandoned = cnt_abandoned;
/* Now check for a ECN Echo that may be stranded And
 * include the cnt_mk'd to have all resends in the
 * control queue.
 */
TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
	if (chk->sent == SCTP_DATAGRAM_RESEND) {
		cnt_mk++;
	}
	if ((chk->whoTo == net) &&
	    (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
		sctp_free_remote_addr(chk->whoTo);
		chk->whoTo = alt;
		if (chk->sent != SCTP_DATAGRAM_RESEND) {
			chk->sent = SCTP_DATAGRAM_RESEND;
			chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
			sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
			cnt_mk++;
		}
		atomic_add_int(&alt->ref_count, 1);
	}
}
#ifdef THIS_SHOULD_NOT_BE_DONE
if ((stcb->asoc.sent_queue_retran_cnt == 0) && (could_be_sent)) {
	/* fix it so we retransmit the highest acked anyway */
	sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
	cnt_mk++;
	could_be_sent->sent = SCTP_DATAGRAM_RESEND;
}
#endif
if (stcb->asoc.sent_queue_retran_cnt != cnt_mk) {
#ifdef INVARIANTS
	SCTP_PRINTF("Local Audit says there are %d for retran asoc cnt:%d we marked:%d this time\n",
		    cnt_mk, stcb->asoc.sent_queue_retran_cnt, num_mk);
#endif
#ifndef SCTP_AUDITING_ENABLED
	stcb->asoc.sent_queue_retran_cnt = cnt_mk;
#endif
}
if (audit_tf) {
	SCTPDBG(SCTP_DEBUG_TIMER4,
		"Audit total flight due to negative value net:%p\n",
		(void *)net);
	stcb->asoc.total_flight = 0;
	stcb->asoc.total_flight_count = 0;
	/* Clear all networks flight size */
	TAILQ_FOREACH(lnets, &stcb->asoc.nets, sctp_next) {
		lnets->flight_size = 0;
		SCTPDBG(SCTP_DEBUG_TIMER4,
			"Net:%p c-f cwnd:%d ssthresh:%d\n",
			(void *)lnets, lnets->cwnd, lnets->ssthresh);
	}
	TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
		if (chk->sent < SCTP_DATAGRAM_RESEND) {
			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
				sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
					       chk->whoTo->flight_size,
					       chk->book_size,
					       (uint32_t)(uintptr_t)chk->whoTo,
					       chk->rec.data.tsn);
			}

			sctp_flight_size_increase(chk);
			sctp_total_flight_increase(stcb, chk);
		}
	}
}
/* We return 1 if we only have a window probe outstanding */
return (0);
}

int
sctp_t3rxt_timer(struct sctp_inpcb *inp,
   struct sctp_tcb *stcb,
   struct sctp_nets *net)
{
struct sctp_nets *alt;
int win_probe, num_mk, num_abandoned;

if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
	sctp_log_fr(0, 0, 0, SCTP_FR_T3_TIMEOUT);
}
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
	struct sctp_nets *lnet;

	TAILQ_FOREACH(lnet, &stcb->asoc.nets, sctp_next) {
		if (net == lnet) {
			sctp_log_cwnd(stcb, lnet, 1, SCTP_CWND_LOG_FROM_T3);
		} else {
			sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_LOG_FROM_T3);
		}
	}
}
/* Find an alternate and mark those for retransmission */
if ((stcb->asoc.peers_rwnd == 0) &&
    (stcb->asoc.total_flight < net->mtu)) {
	SCTP_STAT_INCR(sctps_timowindowprobe);
	win_probe = 1;
} else {
	win_probe = 0;
}

if (win_probe == 0) {
	/* We don't do normal threshold management on window probes */
	if (sctp_threshold_management(inp, stcb, net,
	    stcb->asoc.max_send_times)) {
		/* Association was destroyed */
		return (1);
	} else {
		if (net != stcb->asoc.primary_destination) {
			/* send a immediate HB if our RTO is stale */
			struct timeval now;
			uint32_t ms_goneby;

			(void)SCTP_GETTIME_TIMEVAL(&now);
			if (net->last_sent_time.tv_sec) {
				ms_goneby = (uint32_t)(now.tv_sec - net->last_sent_time.tv_sec) * 1000;
			} else {
				ms_goneby = 0;
			}
			if ((net->dest_state & SCTP_ADDR_PF) == 0) {
				if ((ms_goneby > net->RTO) || (net->RTO == 0)) {
					/*
					 * no recent feed back in an RTO or
					 * more, request a RTT update
					 */
					sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
				}
			}
		}
	}
} else {
	/*
	 * For a window probe we don't penalize the net's but only
	 * the association. This may fail it if SACKs are not coming
	 * back. If sack's are coming with rwnd locked at 0, we will
	 * continue to hold things waiting for rwnd to raise
	 */
	if (sctp_threshold_management(inp, stcb, NULL,
	    stcb->asoc.max_send_times)) {
		/* Association was destroyed */
		return (1);
	}
}
if (stcb->asoc.sctp_cmt_on_off > 0) {
	if (net->pf_threshold < net->failure_threshold) {
		alt = sctp_find_alternate_net(stcb, net, 2);
	} else {
	        /*
		 * CMT: Using RTX_SSTHRESH policy for CMT.
		 * If CMT is being used, then pick dest with
		 * largest ssthresh for any retransmission.
		 */
		alt = sctp_find_alternate_net(stcb, net, 1);
		/*
		 * CUCv2: If a different dest is picked for
		 * the retransmission, then new
		 * (rtx-)pseudo_cumack needs to be tracked
		 * for orig dest. Let CUCv2 track new (rtx-)
		 * pseudo-cumack always.
		 */
		net->find_pseudo_cumack = 1;
		net->find_rtx_pseudo_cumack = 1;
	}
} else {
	alt = sctp_find_alternate_net(stcb, net, 0);
}

num_mk = 0;
num_abandoned = 0;
(void)sctp_mark_all_for_resend(stcb, net, alt, win_probe,
                               &num_mk, &num_abandoned);
/* FR Loss recovery just ended with the T3. */
stcb->asoc.fast_retran_loss_recovery = 0;

/* CMT FR loss recovery ended with the T3 */
net->fast_retran_loss_recovery = 0;
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);
}

/*
 * setup the sat loss recovery that prevents satellite cwnd advance.
 */
stcb->asoc.sat_t3_loss_recovery = 1;
stcb->asoc.sat_t3_recovery_tsn = stcb->asoc.sending_seq;

/* Backoff the timer and cwnd */
sctp_backoff_on_timeout(stcb, net, win_probe, num_mk, num_abandoned);
if (((net->dest_state & SCTP_ADDR_REACHABLE) == 0) ||
    (net->dest_state & SCTP_ADDR_PF)) {
	/* Move all pending over too */
	sctp_move_chunks_from_net(stcb, net);

	/* Get the address that failed, to
	 * force a new src address selection and
	 * a route allocation.
	 */
	if (net->ro._s_addr != NULL) {
		sctp_free_ifa(net->ro._s_addr);
		net->ro._s_addr = NULL;
	}
	net->src_addr_selected = 0;

	/* Force a route allocation too */
#if defined(__FreeBSD__) && !defined(__Userspace__)
	RO_NHFREE(&net->ro);
#else
	if (net->ro.ro_rt != NULL) {
		RTFREE(net->ro.ro_rt);
		net->ro.ro_rt = NULL;
	}
#endif

	/* Was it our primary? */
	if ((stcb->asoc.primary_destination == net) && (alt != net)) {
		/*
		 * Yes, note it as such and find an alternate note:
		 * this means HB code must use this to resent the
		 * primary if it goes active AND if someone does a
		 * change-primary then this flag must be cleared
		 * from any net structures.
		 */
		if (stcb->asoc.alternate != NULL) {
			sctp_free_remote_addr(stcb->asoc.alternate);
		}
		stcb->asoc.alternate = alt;
		atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
	}
}
/*
 * Special case for cookie-echo'ed case, we don't do output but must
 * await the COOKIE-ACK before retransmission
 */
if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) {
	/*
	 * Here we just reset the timer and start again since we
	 * have not established the asoc
	 */
	sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
	return (0);
}
if (stcb->asoc.prsctp_supported) {
	struct sctp_tmit_chunk *lchk;

	lchk = sctp_try_advance_peer_ack_point(stcb, &stcb->asoc);
	/* C3. See if we need to send a Fwd-TSN */
	if (SCTP_TSN_GT(stcb->asoc.advanced_peer_ack_point, stcb->asoc.last_acked_seq)) {
		send_forward_tsn(stcb, &stcb->asoc);
		for (; lchk != NULL; lchk = TAILQ_NEXT(lchk, sctp_next)) {
			if (lchk->whoTo != NULL) {
				break;
			}
		}
		if (lchk != NULL) {
			/* Assure a timer is up */
			sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, lchk->whoTo);
		}
	}
}
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
	sctp_log_cwnd(stcb, net, net->cwnd, SCTP_CWND_LOG_FROM_RTX);
}
return (0);
}

int
sctp_t1init_timer(struct sctp_inpcb *inp,
   struct sctp_tcb *stcb,
   struct sctp_nets *net)
{
/* bump the thresholds */
if (stcb->asoc.delayed_connection) {
	/*
	 * special hook for delayed connection. The library did NOT
	 * complete the rest of its sends.
	 */
	stcb->asoc.delayed_connection = 0;
	sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
	return (0);
}
if (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT) {
	return (0);
}
if (sctp_threshold_management(inp, stcb, net,
    stcb->asoc.max_init_times)) {
	/* Association was destroyed */
	return (1);
}
stcb->asoc.dropped_special_cnt = 0;
sctp_backoff_on_timeout(stcb, stcb->asoc.primary_destination, 1, 0, 0);
if (stcb->asoc.initial_init_rto_max < net->RTO) {
	net->RTO = stcb->asoc.initial_init_rto_max;
}
if (stcb->asoc.numnets > 1) {
	/* If we have more than one addr use it */
	struct sctp_nets *alt;

	alt = sctp_find_alternate_net(stcb, stcb->asoc.primary_destination, 0);
	if (alt != stcb->asoc.primary_destination) {
		sctp_move_chunks_from_net(stcb, stcb->asoc.primary_destination);
		stcb->asoc.primary_destination = alt;
	}
}
/* Send out a new init */
sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
return (0);
}

/*
* For cookie and asconf we actually need to find and mark for resend, then
* increment the resend counter (after all the threshold management stuff of
* course).
*/
int
sctp_cookie_timer(struct sctp_inpcb *inp,
   struct sctp_tcb *stcb,
   struct sctp_nets *net SCTP_UNUSED)
{
struct sctp_nets *alt;
struct sctp_tmit_chunk *cookie;

/* first before all else we must find the cookie */
TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, sctp_next) {
	if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
		break;
	}
}
if (cookie == NULL) {
	if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) {
		/* FOOBAR! */
		struct mbuf *op_err;

		op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
		                             "Cookie timer expired, but no cookie");
		inp->last_abort_code = SCTP_FROM_SCTP_TIMER + SCTP_LOC_3;
		sctp_abort_an_association(inp, stcb, op_err, false, SCTP_SO_NOT_LOCKED);
	} else {
#ifdef INVARIANTS
		panic("Cookie timer expires in wrong state?");
#else
		SCTP_PRINTF("Strange in state %d not cookie-echoed yet c-e timer expires?\n", SCTP_GET_STATE(stcb));
		return (0);
#endif
	}
	return (0);
}
/* Ok we found the cookie, threshold management next */
if (sctp_threshold_management(inp, stcb, cookie->whoTo,
    stcb->asoc.max_init_times)) {
	/* Assoc is over */
	return (1);
}
/*
 * Cleared threshold management, now lets backoff the address
 * and select an alternate
 */
stcb->asoc.dropped_special_cnt = 0;
sctp_backoff_on_timeout(stcb, cookie->whoTo, 1, 0, 0);
alt = sctp_find_alternate_net(stcb, cookie->whoTo, 0);
if (alt != cookie->whoTo) {
	sctp_free_remote_addr(cookie->whoTo);
	cookie->whoTo = alt;
	atomic_add_int(&alt->ref_count, 1);
}
/* Now mark the retran info */
if (cookie->sent != SCTP_DATAGRAM_RESEND) {
	sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
}
cookie->sent = SCTP_DATAGRAM_RESEND;
cookie->flags |= CHUNK_FLAGS_FRAGMENT_OK;
/*
 * Now call the output routine to kick out the cookie again, Note we
 * don't mark any chunks for retran so that FR will need to kick in
 * to move these (or a send timer).
 */
return (0);
}

int
sctp_strreset_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb)
{
struct sctp_nets *alt, *net;
struct sctp_tmit_chunk *strrst = NULL, *chk = NULL;

if (stcb->asoc.stream_reset_outstanding == 0) {
	return (0);
}
/* find the existing STRRESET, we use the seq number we sent out on */
(void)sctp_find_stream_reset(stcb, stcb->asoc.str_reset_seq_out, &strrst);
if (strrst == NULL) {
	return (0);
}
net = strrst->whoTo;
/* do threshold management */
if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
	/* Assoc is over */
	return (1);
}
/*
 * Cleared threshold management, now lets backoff the address
 * and select an alternate
 */
sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
alt = sctp_find_alternate_net(stcb, net, 0);
strrst->whoTo = alt;
atomic_add_int(&alt->ref_count, 1);

/* See if a ECN Echo is also stranded */
TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
	if ((chk->whoTo == net) &&
	    (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
		sctp_free_remote_addr(chk->whoTo);
		if (chk->sent != SCTP_DATAGRAM_RESEND) {
			chk->sent = SCTP_DATAGRAM_RESEND;
			chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
			sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
		}
		chk->whoTo = alt;
		atomic_add_int(&alt->ref_count, 1);
	}
}
if ((net->dest_state & SCTP_ADDR_REACHABLE) == 0) {
	/*
	 * If the address went un-reachable, we need to move to
	 * alternates for ALL chk's in queue
	 */
	sctp_move_chunks_from_net(stcb, net);
}
sctp_free_remote_addr(net);

/* mark the retran info */
if (strrst->sent != SCTP_DATAGRAM_RESEND)
	sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
strrst->sent = SCTP_DATAGRAM_RESEND;
strrst->flags |= CHUNK_FLAGS_FRAGMENT_OK;

/* restart the timer */
sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, inp, stcb, alt);
return (0);
}

int
sctp_asconf_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
	  struct sctp_nets *net)
{
struct sctp_nets *alt;
struct sctp_tmit_chunk *asconf, *chk;

/* is this a first send, or a retransmission? */
if (TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) {
	/* compose a new ASCONF chunk and send it */
	sctp_send_asconf(stcb, net, SCTP_ADDR_NOT_LOCKED);
} else {
	/*
	 * Retransmission of the existing ASCONF is needed
	 */

	/* find the existing ASCONF */
	asconf = TAILQ_FIRST(&stcb->asoc.asconf_send_queue);
	if (asconf == NULL) {
		return (0);
	}
	net = asconf->whoTo;
	/* do threshold management */
	if (sctp_threshold_management(inp, stcb, net,
	    stcb->asoc.max_send_times)) {
		/* Assoc is over */
		return (1);
	}
	if (asconf->snd_count > stcb->asoc.max_send_times) {
		/*
		 * Something is rotten: our peer is not responding to
		 * ASCONFs but apparently is to other chunks.  i.e. it
		 * is not properly handling the chunk type upper bits.
		 * Mark this peer as ASCONF incapable and cleanup.
		 */
		SCTPDBG(SCTP_DEBUG_TIMER1, "asconf_timer: Peer has not responded to our repeated ASCONFs\n");
		sctp_asconf_cleanup(stcb);
		return (0);
	}
	/*
	 * cleared threshold management, so now backoff the net and
	 * select an alternate
	 */
	sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
	alt = sctp_find_alternate_net(stcb, net, 0);
	if (asconf->whoTo != alt) {
		asconf->whoTo = alt;
		atomic_add_int(&alt->ref_count, 1);
	}

	/* See if an ECN Echo is also stranded */
	TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
		if ((chk->whoTo == net) &&
		    (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
			sctp_free_remote_addr(chk->whoTo);
			chk->whoTo = alt;
			if (chk->sent != SCTP_DATAGRAM_RESEND) {
				chk->sent = SCTP_DATAGRAM_RESEND;
				chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
				sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
			}
			atomic_add_int(&alt->ref_count, 1);
		}
	}
	TAILQ_FOREACH(chk, &stcb->asoc.asconf_send_queue, sctp_next) {
		if (chk->whoTo != alt) {
			sctp_free_remote_addr(chk->whoTo);
			chk->whoTo = alt;
			atomic_add_int(&alt->ref_count, 1);
		}
		if (asconf->sent != SCTP_DATAGRAM_RESEND && chk->sent != SCTP_DATAGRAM_UNSENT)
			sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
		chk->sent = SCTP_DATAGRAM_RESEND;
		chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
	}
	if ((net->dest_state & SCTP_ADDR_REACHABLE) == 0) {
		/*
		 * If the address went un-reachable, we need to move
		 * to the alternate for ALL chunks in queue
		 */
		sctp_move_chunks_from_net(stcb, net);
	}
	sctp_free_remote_addr(net);

	/* mark the retran info */
	if (asconf->sent != SCTP_DATAGRAM_RESEND)
		sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
	asconf->sent = SCTP_DATAGRAM_RESEND;
	asconf->flags |= CHUNK_FLAGS_FRAGMENT_OK;

	/* send another ASCONF if any and we can do */
	sctp_send_asconf(stcb, alt, SCTP_ADDR_NOT_LOCKED);
}
return (0);
}

/* Mobility adaptation */
void
sctp_delete_prim_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb)
{
if (stcb->asoc.deleted_primary == NULL) {
	SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: deleted_primary is not stored...\n");
	sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
	return;
}
SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: finished to keep deleted primary ");
SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, &stcb->asoc.deleted_primary->ro._l_addr.sa);
sctp_free_remote_addr(stcb->asoc.deleted_primary);
stcb->asoc.deleted_primary = NULL;
sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
return;
}

/*
* For the shutdown and shutdown-ack, we do not keep one around on the
* control queue. This means we must generate a new one and call the general
* chunk output routine, AFTER having done threshold management.
* It is assumed that net is non-NULL.
*/
int
sctp_shutdown_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
   struct sctp_nets *net)
{
struct sctp_nets *alt;

/* first threshold management */
if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
	/* Assoc is over */
	return (1);
}
sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
/* second select an alternative */
alt = sctp_find_alternate_net(stcb, net, 0);

/* third generate a shutdown into the queue for out net */
sctp_send_shutdown(stcb, alt);

/* fourth restart timer */
sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, inp, stcb, alt);
return (0);
}

int
sctp_shutdownack_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
   struct sctp_nets *net)
{
struct sctp_nets *alt;

/* first threshold management */
if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
	/* Assoc is over */
	return (1);
}
sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
/* second select an alternative */
alt = sctp_find_alternate_net(stcb, net, 0);

/* third generate a shutdown into the queue for out net */
sctp_send_shutdown_ack(stcb, alt);

/* fourth restart timer */
sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, inp, stcb, alt);
return (0);
}

static void
sctp_audit_stream_queues_for_size(struct sctp_inpcb *inp, struct sctp_tcb *stcb)
{
struct sctp_stream_queue_pending *sp;
unsigned int i, chks_in_queue = 0;
int being_filled = 0;

KASSERT(inp != NULL, ("inp is NULL"));
KASSERT(stcb != NULL, ("stcb is NULL"));
SCTP_TCB_LOCK_ASSERT(stcb);
KASSERT(TAILQ_EMPTY(&stcb->asoc.send_queue), ("send_queue not empty"));
KASSERT(TAILQ_EMPTY(&stcb->asoc.sent_queue), ("sent_queue not empty"));

if (stcb->asoc.sent_queue_retran_cnt) {
	SCTP_PRINTF("Hmm, sent_queue_retran_cnt is non-zero %d\n",
		    stcb->asoc.sent_queue_retran_cnt);
	stcb->asoc.sent_queue_retran_cnt = 0;
}
if (stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
	/* No stream scheduler information, initialize scheduler */
	stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc);
	if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
		/* yep, we lost a stream or two */
		SCTP_PRINTF("Found additional streams NOT managed by scheduler, corrected\n");
	} else {
		/* no streams lost */
		stcb->asoc.total_output_queue_size = 0;
	}
}
/* Check to see if some data queued, if so report it */
for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
	if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
		TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
			if (sp->msg_is_complete)
				being_filled++;
			chks_in_queue++;
		}
	}
}
if (chks_in_queue != stcb->asoc.stream_queue_cnt) {
	SCTP_PRINTF("Hmm, stream queue cnt at %d I counted %d in stream out wheel\n",
		    stcb->asoc.stream_queue_cnt, chks_in_queue);
}
if (chks_in_queue) {
	/* call the output queue function */
	sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_T3, SCTP_SO_NOT_LOCKED);
	if ((TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
	    (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
		/*
		 * Probably should go in and make it go back through
		 * and add fragments allowed
		 */
		if (being_filled == 0) {
			SCTP_PRINTF("Still nothing moved %d chunks are stuck\n",
				    chks_in_queue);
		}
	}
} else {
	SCTP_PRINTF("Found no chunks on any queue tot:%lu\n",
		    (u_long)stcb->asoc.total_output_queue_size);
	stcb->asoc.total_output_queue_size = 0;
}
}

int
sctp_heartbeat_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
   struct sctp_nets *net)
{
bool net_was_pf;

net_was_pf = (net->dest_state & SCTP_ADDR_PF) != 0;
if (net->hb_responded == 0) {
	if (net->ro._s_addr != NULL) {
		/* Invalidate the src address if we did not get
		 * a response last time.
		 */
		sctp_free_ifa(net->ro._s_addr);
		net->ro._s_addr = NULL;
		net->src_addr_selected = 0;
	}
	sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
	if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
		/* Assoc is over */
		return (1);
	}
}
/* Zero PBA, if it needs it */
if (net->partial_bytes_acked > 0) {
	net->partial_bytes_acked = 0;
}
if ((stcb->asoc.total_output_queue_size > 0) &&
    (TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
    (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
	sctp_audit_stream_queues_for_size(inp, stcb);
}
if ((((net->dest_state & SCTP_ADDR_NOHB) == 0) ||
     (net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
    (net_was_pf || ((net->dest_state & SCTP_ADDR_PF) == 0))) {
	/* When moving to PF during threshold management, a HB has been
	   queued in that routine. */
	uint32_t ms_gone_by;

	if ((net->last_sent_time.tv_sec > 0) ||
	    (net->last_sent_time.tv_usec > 0)) {
#if defined(__FreeBSD__) && !defined(__Userspace__)
		struct timeval diff;

		SCTP_GETTIME_TIMEVAL(&diff);
		timevalsub(&diff, &net->last_sent_time);
#else
		struct timeval diff, now;

		SCTP_GETTIME_TIMEVAL(&now);
		timersub(&now, &net->last_sent_time, &diff);
#endif
		ms_gone_by = (uint32_t)(diff.tv_sec * 1000) +
		             (uint32_t)(diff.tv_usec / 1000);
	} else {
		ms_gone_by = 0xffffffff;
	}
	if ((ms_gone_by >= net->heart_beat_delay) ||
	    (net->dest_state & SCTP_ADDR_UNCONFIRMED) ||
	    (net->dest_state & SCTP_ADDR_PF)) {
		sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
	}
}
return (0);
}

void
sctp_pathmtu_timer(struct sctp_inpcb *inp,
   struct sctp_tcb *stcb,
   struct sctp_nets *net)
{
uint32_t next_mtu, mtu;

next_mtu = sctp_get_next_mtu(net->mtu);

if ((next_mtu > net->mtu) && (net->port == 0)) {
	if ((net->src_addr_selected == 0) ||
	    (net->ro._s_addr == NULL) ||
	    (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
		if ((net->ro._s_addr != NULL) && (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
			sctp_free_ifa(net->ro._s_addr);
			net->ro._s_addr = NULL;
			net->src_addr_selected = 0;
		} else  if (net->ro._s_addr == NULL) {
#if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
			if (net->ro._l_addr.sa.sa_family == AF_INET6) {
				struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
				/* KAME hack: embed scopeid */
#if defined(__APPLE__) && !defined(__Userspace__)
#if defined(APPLE_LEOPARD) || defined(APPLE_SNOWLEOPARD)
				(void)in6_embedscope(&sin6->sin6_addr, sin6, NULL, NULL);
#else
				(void)in6_embedscope(&sin6->sin6_addr, sin6, NULL, NULL, NULL);
#endif
#elif defined(SCTP_KAME)
				(void)sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
#else
				(void)in6_embedscope(&sin6->sin6_addr, sin6);
#endif
			}
#endif

			net->ro._s_addr = sctp_source_address_selection(inp,
									stcb,
									(sctp_route_t *)&net->ro,
									net, 0, stcb->asoc.vrf_id);
#if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
			if (net->ro._l_addr.sa.sa_family == AF_INET6) {
				struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
#ifdef SCTP_KAME
				(void)sa6_recoverscope(sin6);
#else
				(void)in6_recoverscope(sin6, &sin6->sin6_addr, NULL);
#endif	/* SCTP_KAME */
			}
#endif	/* INET6 */
		}
		if (net->ro._s_addr)
			net->src_addr_selected = 1;
	}
	if (net->ro._s_addr) {
#if defined(__FreeBSD__) && !defined(__Userspace__)
		mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._s_addr.sa, net->ro.ro_nh);
#else
		mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._s_addr.sa, net->ro.ro_rt);
#endif
#if defined(INET) || defined(INET6)
		if (net->port) {
			mtu -= sizeof(struct udphdr);
		}
#endif
		if (mtu > next_mtu) {
			net->mtu = next_mtu;
		} else {
			net->mtu = mtu;
		}
	}
}
/* restart the timer */
sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net);
}

void
sctp_autoclose_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb)
{
struct timeval tn, *tim_touse;
struct sctp_association *asoc;
uint32_t ticks_gone_by;

(void)SCTP_GETTIME_TIMEVAL(&tn);
if (stcb->asoc.sctp_autoclose_ticks > 0 &&
    sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
	/* Auto close is on */
	asoc = &stcb->asoc;
	/* pick the time to use */
	if (asoc->time_last_rcvd.tv_sec >
	    asoc->time_last_sent.tv_sec) {
		tim_touse = &asoc->time_last_rcvd;
	} else {
		tim_touse = &asoc->time_last_sent;
	}
	/* Now has long enough transpired to autoclose? */
	ticks_gone_by = sctp_secs_to_ticks((uint32_t)(tn.tv_sec - tim_touse->tv_sec));
	if (ticks_gone_by >= asoc->sctp_autoclose_ticks) {
		/*
		 * autoclose time has hit, call the output routine,
		 * which should do nothing just to be SURE we don't
		 * have hanging data. We can then safely check the
		 * queues and know that we are clear to send
		 * shutdown
		 */
		sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_AUTOCLOSE_TMR, SCTP_SO_NOT_LOCKED);
		/* Are we clean? */
		if (TAILQ_EMPTY(&asoc->send_queue) &&
		    TAILQ_EMPTY(&asoc->sent_queue)) {
			/*
			 * there is nothing queued to send, so I'm
			 * done...
			 */
			if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
				/* only send SHUTDOWN 1st time thru */
				struct sctp_nets *net;

				if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
				    (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
					SCTP_STAT_DECR_GAUGE32(sctps_currestab);
				}
				SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
				sctp_stop_timers_for_shutdown(stcb);
				if (stcb->asoc.alternate) {
					net = stcb->asoc.alternate;
				} else {
					net = stcb->asoc.primary_destination;
				}
				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);
			}
		}
	} else {
		/*
		 * No auto close at this time, reset t-o to check
		 * later
		 */
		uint32_t tmp;

		/* fool the timer startup to use the time left */
		tmp = asoc->sctp_autoclose_ticks;
		asoc->sctp_autoclose_ticks -= ticks_gone_by;
		sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
		/* restore the real tick value */
		asoc->sctp_autoclose_ticks = tmp;
	}
}
}