The Tor Browser: netwerk/sctp/src/netinet/sctp_timer.c@4ab42b5ab56c (annotated)

netwerk/sctp/src/netinet/sctp_timer.c@4ab42b5ab56c (annotated)

netwerk/sctp/src/netinet/sctp_timer.c

Wed, 31 Dec 2014 07:53:36 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 07:53:36 +0100
branch: TOR_BUG_3246
changeset 5: 4ab42b5ab56c
permissions: -rwxr-xr-x

Correct small whitespace inconsistency, lost while renaming variables.

 /*-
  * 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.
  */
 #ifdef __FreeBSD__
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD: head/sys/netinet/sctp_timer.c 257359 2013-10-29 20:04:50Z tuexen $");
 #endif
 #define _IP_VHL
 #include <netinet/sctp_os.h>
 #include <netinet/sctp_pcb.h>
 #ifdef INET6
 #if defined(__Userspace_os_FreeBSD)
 #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(__Userspace_os_Windows)
 #include <netinet/udp.h>
 #endif
 #if defined(__APPLE__)
 #define APPLE_FILE_NO 6
 #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);
 }
 int
 sctp_threshold_management(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
     struct sctp_nets *net, uint16_t threshold)
 {
 	if (net) {
 		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)) {
 				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, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_TIMER + SCTP_LOC_3);
 				sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
 			}
 		}
 	}
 	if (stcb == NULL)
 		return (0);
 	if (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 *oper;
 		oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)),
 , M_NOWAIT, 1, MT_DATA);
 		if (oper) {
 			struct sctp_paramhdr *ph;
 			uint32_t *ippp;
 			SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
 			    sizeof(uint32_t);
 			ph = mtod(oper, struct sctp_paramhdr *);
 			ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
 			ph->param_length = htons(SCTP_BUF_LEN(oper));
 			ippp = (uint32_t *) (ph + 1);
 			*ippp = htonl(SCTP_FROM_SCTP_TIMER+SCTP_LOC_1);
 		}
 		inp->last_abort_code = SCTP_FROM_SCTP_TIMER+SCTP_LOC_1;
 		sctp_abort_an_association(inp, stcb, oper, SCTP_SO_NOT_LOCKED);
 		return (1);
 	}
 	return (0);
 }
 /*
  * sctp_find_alternate_net() returns a non-NULL pointer as long
  * the argument net is non-NULL.
  */
 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;
 	int once;
 	/* 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 others but net */
 		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 desination 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);
 		}
 	}
 	mnet = net;
 	once = 0;
 	if (mnet == NULL) {
 		mnet = TAILQ_FIRST(&stcb->asoc.nets);
 		if (mnet == NULL) {
 			return (NULL);
 		}
 	}
 	do {
 		alt = TAILQ_NEXT(mnet, sctp_next);
 		if (alt == NULL)
  		{
 			once++;
 			if (once > 1) {
 				break;
 			}
 			alt = TAILQ_FIRST(&stcb->asoc.nets);
 			if (alt == NULL) {
 				return (NULL);
 			}
 		}
 		if (alt->ro.ro_rt == NULL) {
 			if (alt->ro._s_addr) {
 				sctp_free_ifa(alt->ro._s_addr);
 				alt->ro._s_addr = NULL;
 			}
 			alt->src_addr_selected = 0;
 		}
 		/*sa_ignore NO_NULL_CHK*/
 		if (((alt->dest_state & SCTP_ADDR_REACHABLE) == SCTP_ADDR_REACHABLE) &&
 		    (alt->ro.ro_rt != NULL) &&
 		    (!(alt->dest_state & SCTP_ADDR_UNCONFIRMED))) {
 			/* Found a reachable address */
 			break;
 		}
 		mnet = alt;
 	} while (alt != NULL);
 	if (alt == NULL) {
 		/* Case where NO insv network exists (dormant state) */
 		/* we rotate destinations */
 		once = 0;
 		mnet = net;
 		do {
 			if (mnet == NULL) {
 				return (TAILQ_FIRST(&stcb->asoc.nets));
 			}
 			alt = TAILQ_NEXT(mnet, sctp_next);
 			if (alt == NULL) {
 				once++;
 				if (once > 1) {
 					break;
 				}
 				alt = TAILQ_FIRST(&stcb->asoc.nets);
 			}
 			/*sa_ignore NO_NULL_CHK*/
 			if ((!(alt->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
 			    (alt != net)) {
 				/* Found an alternate address */
 				break;
 			}
 			mnet = alt;
 		} while (alt != NULL);
 	}
 	if (alt == NULL) {
 		return (net);
 	}
 	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) {
 		net->RTO = stcb->asoc.minrto;
 	}
 	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_seq)) {
 			SCTP_PRINTF("Found chk:%p tsn:%x <= last_acked_seq:%x\n",
 			            (void *)chk, chk->rec.data.TSN_seq, asoc->last_acked_seq);
 			if (chk->sent != SCTP_DATAGRAM_NR_ACKED) {
 				if (asoc->strmout[chk->rec.data.stream_number].chunks_on_queues > 0) {
 					asoc->strmout[chk->rec.data.stream_number].chunks_on_queues--;
 				}
 			}
 			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->peer_supports_prsctp && 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_seq);
 	}
 }
 #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;
 	int recovery_cnt = 0;
 	/* 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;
 #ifndef __FreeBSD__
 	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, now.tv_sec, now.tv_usec, SCTP_FR_T3_MARK_TIME);
 		sctp_log_fr(0, 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_seq)) {
 			/* 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_seq);
 			recovery_cnt++;
 #ifdef INVARIANTS
 			panic("last acked >= chk on sent-Q");
 #else
 			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_seq,
 					    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,
 						    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.peer_supports_prsctp && PR_SCTP_TTL_ENABLED(chk->flags)) {
 				/* Is it expired? */
 #ifndef __FreeBSD__
 				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,
 ,
 										 SCTP_SO_NOT_LOCKED);
 						cnt_abandoned++;
 					}
 					continue;
 				}
 			}
 			if (stcb->asoc.peer_supports_prsctp && 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,
 ,
 										 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_seq;
 				}
 				tsnlast = chk->rec.data.TSN_seq;
 				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
 					sctp_log_fr(chk->rec.data.TSN_seq, chk->snd_count,
 , 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,
 						       (uintptr_t)chk->whoTo,
 						       chk->rec.data.TSN_seq);
 				}
 				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;
 			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_seq;
 				}
 			}
 			/* 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:%ld\n",
 			num_mk, (u_long)stcb->asoc.peers_rwnd);
 		SCTPDBG(SCTP_DEBUG_TIMER1, "LAST TSN marked was %x\n",
 			tsnlast);
 		SCTPDBG(SCTP_DEBUG_TIMER1, "Num marked for retransmission was %d peer-rwd:%d\n",
 			num_mk,
 			(int)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;
 				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,
 						       (uintptr_t)chk->whoTo,
 						       chk->rec.data.TSN_seq);
 				}
 				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;
 				unsigned int ms_goneby;
 				(void)SCTP_GETTIME_TIMEVAL(&now);
 				if (net->last_sent_time.tv_sec) {
 					ms_goneby = (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)) ||
 	    (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 selecton and
 		 * a route allocation.
 		 */
 		if (net->ro._s_addr) {
 			sctp_free_ifa(net->ro._s_addr);
 	 		net->ro._s_addr = NULL;
 		}
  		net->src_addr_selected = 0;
 		/* Force a route allocation too */
 		if (net->ro.ro_rt) {
 			RTFREE(net->ro.ro_rt);
 			net->ro.ro_rt = NULL;
 		}
 		/* 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) {
 				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->asoc) == 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.peer_supports_prsctp) {
 		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);
 			if (lchk) {
 				/* 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->asoc)) != 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->asoc) == SCTP_STATE_COOKIE_ECHOED) {
 			/* FOOBAR! */
 			struct mbuf *oper;
 			oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)),
 , M_NOWAIT, 1, MT_DATA);
 			if (oper) {
 				struct sctp_paramhdr *ph;
 				uint32_t *ippp;
 				SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
 				    sizeof(uint32_t);
 				ph = mtod(oper, struct sctp_paramhdr *);
 				ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
 				ph->param_length = htons(SCTP_BUF_LEN(oper));
 				ippp = (uint32_t *) (ph + 1);
 				*ippp = htonl(SCTP_FROM_SCTP_TIMER+SCTP_LOC_3);
 			}
 			inp->last_abort_code = SCTP_FROM_SCTP_TIMER+SCTP_LOC_4;
 			sctp_abort_an_association(inp, stcb, oper, 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->asoc));
 			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 theshold management now lets backoff the address & 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;
 	/*
 	 * 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 *net)
 {
 	struct sctp_nets *alt;
 	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);
 	}
 	/* do threshold management */
 	if (sctp_threshold_management(inp, stcb, strrst->whoTo,
 	    stcb->asoc.max_send_times)) {
 		/* Assoc is over */
 		return (1);
 	}
 	/*
 	 * cleared theshold management now lets backoff the address & select
 	 * an alternate
 	 */
 	sctp_backoff_on_timeout(stcb, strrst->whoTo, 1, 0, 0);
 	alt = sctp_find_alternate_net(stcb, strrst->whoTo, 0);
 	sctp_free_remote_addr(strrst->whoTo);
 	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;
 				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)) {
 		/*
 		 * 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);
 	}
 	/* mark the retran info */
 	if (strrst->sent != SCTP_DATAGRAM_RESEND)
 		sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 	strrst->sent = SCTP_DATAGRAM_RESEND;
 	/* restart the timer */
 	sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, inp, stcb, strrst->whoTo);
 	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);
 		}
 		/* do threshold management */
 		if (sctp_threshold_management(inp, stcb, asconf->whoTo,
 		    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, net);
 			return (0);
 		}
 		/*
 		 * cleared threshold management, so now backoff the net and
 		 * select an alternate
 		 */
 		sctp_backoff_on_timeout(stcb, asconf->whoTo, 1, 0, 0);
 		alt = sctp_find_alternate_net(stcb, asconf->whoTo, 0);
 		if (asconf->whoTo != alt) {
 			sctp_free_remote_addr(asconf->whoTo);
 			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;
 					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;
 		}
 		if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
 			/*
 			 * 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);
 		}
 		/* mark the retran info */
 		if (asconf->sent != SCTP_DATAGRAM_RESEND)
 			sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 		asconf->sent = SCTP_DATAGRAM_RESEND;
 		/* 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,
                        struct sctp_nets *net SCTP_UNUSED)
 {
 	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 managment */
 	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 managment */
 	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;
 	/*
 	 * This function is ONLY called when the send/sent queues are empty.
 	 */
 	if ((stcb == NULL) || (inp == NULL))
 		return;
 	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, 0);
 		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)
 {
 	uint8_t net_was_pf;
 	if (net->dest_state & SCTP_ADDR_PF) {
 		net_was_pf = 1;
 	} else {
 		net_was_pf = 0;
 	}
 	if (net->hb_responded == 0) {
 		if (net->ro._s_addr) {
 			/* 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) {
 		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) &&
 	    !((net_was_pf == 0) && (net->dest_state & SCTP_ADDR_PF))) {
 		/* when move to PF during threshold mangement, 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)) {
 #ifdef __FreeBSD__
 			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_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__)
 #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) {
 			mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._s_addr.sa, net->ro.ro_rt);
 			if (net->port) {
 				mtu -= sizeof(struct udphdr);
 			}
 			if (mtu > next_mtu) {
 				net->mtu = next_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 sctp_nets *net)
 {
 	struct timeval tn, *tim_touse;
 	struct sctp_association *asoc;
 	int ticks_gone_by;
 	(void)SCTP_GETTIME_TIMEVAL(&tn);
 	if (stcb->asoc.sctp_autoclose_ticks &&
 	    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 = SEC_TO_TICKS(tn.tv_sec - tim_touse->tv_sec);
 		if ((ticks_gone_by > 0) &&
 		    (ticks_gone_by >= (int)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(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
 					/* only send SHUTDOWN 1st time thru */
 					struct sctp_nets *netp;
 					if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
 					    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 						SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 					}
 					SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
 					SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 					sctp_stop_timers_for_shutdown(stcb);
 					if (stcb->asoc.alternate) {
 						netp = stcb->asoc.alternate;
 					} else {
 						netp = stcb->asoc.primary_destination;
 					}
 					sctp_send_shutdown(stcb, netp);
 					sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
 							 stcb->sctp_ep, stcb,
 							 netp);
 					sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
 							 stcb->sctp_ep, stcb,
 							 netp);
 				}
 			}
 		} else {
 			/*
 			 * No auto close at this time, reset t-o to check
 			 * later
 			 */
 			int 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,
 			    net);
 			/* restore the real tick value */
 			asoc->sctp_autoclose_ticks = tmp;
 		}
 	}
 }

The Tor Browser / annotate

netwerk/sctp/src/netinet/sctp_timer.c@4ab42b5ab56c (annotated)

netwerk/sctp/src/netinet/sctp_timer.c