2 * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
3 * Copyright (c) 2008-2011, by Randall Stewart. All rights reserved.
4 * Copyright (c) 2008-2011, by Michael Tuexen. All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
9 * a) Redistributions of source code must retain the above copyright notice,
10 * this list of conditions and the following disclaimer.
12 * b) Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in
14 * the documentation and/or other materials provided with the distribution.
16 * c) Neither the name of Cisco Systems, Inc. nor the names of its
17 * contributors may be used to endorse or promote products derived
18 * from this software without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
22 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
30 * THE POSSIBILITY OF SUCH DAMAGE.
33 /* $KAME: sctp_timer.c,v 1.29 2005/03/06 16:04:18 itojun Exp $ */
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
39 #include <netinet/sctp_os.h>
40 #include <netinet/sctp_pcb.h>
43 #include <netinet/sctp_var.h>
44 #include <netinet/sctp_sysctl.h>
45 #include <netinet/sctp_timer.h>
46 #include <netinet/sctputil.h>
47 #include <netinet/sctp_output.h>
48 #include <netinet/sctp_header.h>
49 #include <netinet/sctp_indata.h>
50 #include <netinet/sctp_asconf.h>
51 #include <netinet/sctp_input.h>
52 #include <netinet/sctp.h>
53 #include <netinet/sctp_uio.h>
54 #include <netinet/udp.h>
58 sctp_audit_retranmission_queue(struct sctp_association *asoc)
60 struct sctp_tmit_chunk *chk;
62 SCTPDBG(SCTP_DEBUG_TIMER4, "Audit invoked on send queue cnt:%d onqueue:%d\n",
63 asoc->sent_queue_retran_cnt,
64 asoc->sent_queue_cnt);
65 asoc->sent_queue_retran_cnt = 0;
66 asoc->sent_queue_cnt = 0;
67 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
68 if (chk->sent == SCTP_DATAGRAM_RESEND) {
69 sctp_ucount_incr(asoc->sent_queue_retran_cnt);
71 asoc->sent_queue_cnt++;
73 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
74 if (chk->sent == SCTP_DATAGRAM_RESEND) {
75 sctp_ucount_incr(asoc->sent_queue_retran_cnt);
78 TAILQ_FOREACH(chk, &asoc->asconf_send_queue, sctp_next) {
79 if (chk->sent == SCTP_DATAGRAM_RESEND) {
80 sctp_ucount_incr(asoc->sent_queue_retran_cnt);
83 SCTPDBG(SCTP_DEBUG_TIMER4, "Audit completes retran:%d onqueue:%d\n",
84 asoc->sent_queue_retran_cnt,
85 asoc->sent_queue_cnt);
89 sctp_threshold_management(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
90 struct sctp_nets *net, uint16_t threshold)
94 SCTPDBG(SCTP_DEBUG_TIMER4, "Error count for %p now %d thresh:%d\n",
95 net, net->error_count,
96 net->failure_threshold);
97 if (net->error_count > net->failure_threshold) {
98 /* We had a threshold failure */
99 if (net->dest_state & SCTP_ADDR_REACHABLE) {
100 net->dest_state &= ~SCTP_ADDR_REACHABLE;
101 net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
102 net->dest_state &= ~SCTP_ADDR_PF;
103 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
105 SCTP_FAILED_THRESHOLD,
106 (void *)net, SCTP_SO_NOT_LOCKED);
108 } else if ((net->pf_threshold < net->failure_threshold) &&
109 (net->error_count > net->pf_threshold)) {
110 if (!(net->dest_state & SCTP_ADDR_PF)) {
111 net->dest_state |= SCTP_ADDR_PF;
112 net->last_active = sctp_get_tick_count();
113 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
114 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_TIMER + SCTP_LOC_3);
115 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
123 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0) {
124 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
125 sctp_misc_ints(SCTP_THRESHOLD_INCR,
126 stcb->asoc.overall_error_count,
127 (stcb->asoc.overall_error_count + 1),
128 SCTP_FROM_SCTP_TIMER,
131 stcb->asoc.overall_error_count++;
134 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
135 sctp_misc_ints(SCTP_THRESHOLD_INCR,
136 stcb->asoc.overall_error_count,
137 (stcb->asoc.overall_error_count + 1),
138 SCTP_FROM_SCTP_TIMER,
141 stcb->asoc.overall_error_count++;
143 SCTPDBG(SCTP_DEBUG_TIMER4, "Overall error count for %p now %d thresh:%u state:%x\n",
144 &stcb->asoc, stcb->asoc.overall_error_count,
145 (uint32_t) threshold,
146 ((net == NULL) ? (uint32_t) 0 : (uint32_t) net->dest_state));
148 * We specifically do not do >= to give the assoc one more change
151 if (stcb->asoc.overall_error_count > threshold) {
152 /* Abort notification sends a ULP notify */
155 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)),
156 0, M_DONTWAIT, 1, MT_DATA);
158 struct sctp_paramhdr *ph;
161 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
163 ph = mtod(oper, struct sctp_paramhdr *);
164 ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
165 ph->param_length = htons(SCTP_BUF_LEN(oper));
166 ippp = (uint32_t *) (ph + 1);
167 *ippp = htonl(SCTP_FROM_SCTP_TIMER + SCTP_LOC_1);
169 inp->last_abort_code = SCTP_FROM_SCTP_TIMER + SCTP_LOC_1;
170 sctp_abort_an_association(inp, stcb, SCTP_FAILED_THRESHOLD, oper, SCTP_SO_NOT_LOCKED);
177 * sctp_find_alternate_net() returns a non-NULL pointer as long
178 * the argument net is non-NULL.
181 sctp_find_alternate_net(struct sctp_tcb *stcb,
182 struct sctp_nets *net,
185 /* Find and return an alternate network if possible */
186 struct sctp_nets *alt, *mnet, *min_errors_net = NULL, *max_cwnd_net = NULL;
189 /* JRS 5/14/07 - Initialize min_errors to an impossible value. */
191 uint32_t max_cwnd = 0;
193 if (stcb->asoc.numnets == 1) {
194 /* No others but net */
195 return (TAILQ_FIRST(&stcb->asoc.nets));
198 * JRS 5/14/07 - If mode is set to 2, use the CMT PF find alternate
199 * net algorithm. This algorithm chooses the active destination (not
200 * in PF state) with the largest cwnd value. If all destinations are
201 * in PF state, unreachable, or unconfirmed, choose the desination
202 * that is in PF state with the lowest error count. In case of a
203 * tie, choose the destination that was most recently active.
206 TAILQ_FOREACH(mnet, &stcb->asoc.nets, sctp_next) {
208 * JRS 5/14/07 - If the destination is unreachable
209 * or unconfirmed, skip it.
211 if (((mnet->dest_state & SCTP_ADDR_REACHABLE) != SCTP_ADDR_REACHABLE) ||
212 (mnet->dest_state & SCTP_ADDR_UNCONFIRMED)) {
216 * JRS 5/14/07 - If the destination is reachable
217 * but in PF state, compare the error count of the
218 * destination to the minimum error count seen thus
219 * far. Store the destination with the lower error
220 * count. If the error counts are equal, store the
221 * destination that was most recently active.
223 if (mnet->dest_state & SCTP_ADDR_PF) {
225 * JRS 5/14/07 - If the destination under
226 * consideration is the current destination,
227 * work as if the error count is one higher.
228 * The actual error count will not be
229 * incremented until later in the t3
233 if (min_errors == -1) {
234 min_errors = mnet->error_count + 1;
235 min_errors_net = mnet;
236 } else if (mnet->error_count + 1 < min_errors) {
237 min_errors = mnet->error_count + 1;
238 min_errors_net = mnet;
239 } else if (mnet->error_count + 1 == min_errors
240 && mnet->last_active > min_errors_net->last_active) {
241 min_errors_net = mnet;
242 min_errors = mnet->error_count + 1;
246 if (min_errors == -1) {
247 min_errors = mnet->error_count;
248 min_errors_net = mnet;
249 } else if (mnet->error_count < min_errors) {
250 min_errors = mnet->error_count;
251 min_errors_net = mnet;
252 } else if (mnet->error_count == min_errors
253 && mnet->last_active > min_errors_net->last_active) {
254 min_errors_net = mnet;
255 min_errors = mnet->error_count;
261 * JRS 5/14/07 - If the destination is reachable and
262 * not in PF state, compare the cwnd of the
263 * destination to the highest cwnd seen thus far.
264 * Store the destination with the higher cwnd value.
265 * If the cwnd values are equal, randomly choose one
266 * of the two destinations.
268 if (max_cwnd < mnet->cwnd) {
270 max_cwnd = mnet->cwnd;
271 } else if (max_cwnd == mnet->cwnd) {
275 if (stcb->asoc.hb_random_idx > 3) {
276 rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
277 memcpy(stcb->asoc.hb_random_values, &rndval, sizeof(stcb->asoc.hb_random_values));
278 this_random = stcb->asoc.hb_random_values[0];
279 stcb->asoc.hb_random_idx++;
280 stcb->asoc.hb_ect_randombit = 0;
282 this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
283 stcb->asoc.hb_random_idx++;
284 stcb->asoc.hb_ect_randombit = 0;
286 if (this_random % 2 == 1) {
288 max_cwnd = mnet->cwnd; /* Useless? */
292 if (max_cwnd_net == NULL) {
293 if (min_errors_net == NULL) {
296 return (min_errors_net);
298 return (max_cwnd_net);
302 * JRS 5/14/07 - If mode is set to 1, use the CMT policy for
303 * choosing an alternate net.
305 else if (mode == 1) {
306 TAILQ_FOREACH(mnet, &stcb->asoc.nets, sctp_next) {
307 if (((mnet->dest_state & SCTP_ADDR_REACHABLE) != SCTP_ADDR_REACHABLE) ||
308 (mnet->dest_state & SCTP_ADDR_UNCONFIRMED)) {
310 * will skip ones that are not-reachable or
315 if (max_cwnd < mnet->cwnd) {
317 max_cwnd = mnet->cwnd;
318 } else if (max_cwnd == mnet->cwnd) {
322 if (stcb->asoc.hb_random_idx > 3) {
323 rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
324 memcpy(stcb->asoc.hb_random_values, &rndval,
325 sizeof(stcb->asoc.hb_random_values));
326 this_random = stcb->asoc.hb_random_values[0];
327 stcb->asoc.hb_random_idx = 0;
328 stcb->asoc.hb_ect_randombit = 0;
330 this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
331 stcb->asoc.hb_random_idx++;
332 stcb->asoc.hb_ect_randombit = 0;
334 if (this_random % 2) {
336 max_cwnd = mnet->cwnd;
341 return (max_cwnd_net);
348 mnet = TAILQ_FIRST(&stcb->asoc.nets);
354 alt = TAILQ_NEXT(mnet, sctp_next);
360 alt = TAILQ_FIRST(&stcb->asoc.nets);
365 if (alt->ro.ro_rt == NULL) {
366 if (alt->ro._s_addr) {
367 sctp_free_ifa(alt->ro._s_addr);
368 alt->ro._s_addr = NULL;
370 alt->src_addr_selected = 0;
372 /* sa_ignore NO_NULL_CHK */
373 if (((alt->dest_state & SCTP_ADDR_REACHABLE) == SCTP_ADDR_REACHABLE) &&
374 (alt->ro.ro_rt != NULL) &&
375 (!(alt->dest_state & SCTP_ADDR_UNCONFIRMED))) {
376 /* Found a reachable address */
380 } while (alt != NULL);
383 /* Case where NO insv network exists (dormant state) */
384 /* we rotate destinations */
389 return (TAILQ_FIRST(&stcb->asoc.nets));
391 alt = TAILQ_NEXT(mnet, sctp_next);
397 alt = TAILQ_FIRST(&stcb->asoc.nets);
399 /* sa_ignore NO_NULL_CHK */
400 if ((!(alt->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
402 /* Found an alternate address */
406 } while (alt != NULL);
415 sctp_backoff_on_timeout(struct sctp_tcb *stcb,
416 struct sctp_nets *net,
418 int num_marked, int num_abandoned)
421 net->RTO = stcb->asoc.minrto;
424 if (net->RTO > stcb->asoc.maxrto) {
425 net->RTO = stcb->asoc.maxrto;
427 if ((win_probe == 0) && (num_marked || num_abandoned)) {
428 /* We don't apply penalty to window probe scenarios */
429 /* JRS - Use the congestion control given in the CC module */
430 stcb->asoc.cc_functions.sctp_cwnd_update_after_timeout(stcb, net);
436 sctp_recover_sent_list(struct sctp_tcb *stcb)
438 struct sctp_tmit_chunk *chk, *nchk;
439 struct sctp_association *asoc;
442 TAILQ_FOREACH_SAFE(chk, &asoc->sent_queue, sctp_next, nchk) {
443 if (SCTP_TSN_GE(asoc->last_acked_seq, chk->rec.data.TSN_seq)) {
444 SCTP_PRINTF("Found chk:%p tsn:%x <= last_acked_seq:%x\n",
445 chk, chk->rec.data.TSN_seq, asoc->last_acked_seq);
446 TAILQ_REMOVE(&asoc->sent_queue, chk, sctp_next);
447 if (chk->pr_sctp_on) {
448 if (asoc->pr_sctp_cnt != 0)
452 /* sa_ignore NO_NULL_CHK */
453 sctp_free_bufspace(stcb, asoc, chk, 1);
454 sctp_m_freem(chk->data);
456 if (asoc->peer_supports_prsctp && PR_SCTP_BUF_ENABLED(chk->flags)) {
457 asoc->sent_queue_cnt_removeable--;
460 asoc->sent_queue_cnt--;
461 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
464 SCTP_PRINTF("after recover order is as follows\n");
465 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
466 SCTP_PRINTF("chk:%p TSN:%x\n", chk, chk->rec.data.TSN_seq);
473 sctp_mark_all_for_resend(struct sctp_tcb *stcb,
474 struct sctp_nets *net,
475 struct sctp_nets *alt,
482 * Mark all chunks (well not all) that were sent to *net for
483 * retransmission. Move them to alt for there destination as well...
484 * We only mark chunks that have been outstanding long enough to
485 * have received feed-back.
487 struct sctp_tmit_chunk *chk, *nchk;
488 struct sctp_nets *lnets;
489 struct timeval now, min_wait, tv;
492 int audit_tf, num_mk, fir;
494 uint32_t orig_flight, orig_tf;
495 uint32_t tsnlast, tsnfirst;
496 int recovery_cnt = 0;
499 /* none in flight now */
503 * figure out how long a data chunk must be pending before we can
506 (void)SCTP_GETTIME_TIMEVAL(&now);
507 /* get cur rto in micro-seconds */
508 cur_rto = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv;
510 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
512 stcb->asoc.peers_rwnd,
514 SCTP_FR_T3_MARK_TIME);
515 sctp_log_fr(net->flight_size, 0, 0, SCTP_FR_CWND_REPORT);
516 sctp_log_fr(net->flight_size, net->cwnd, stcb->asoc.total_flight, SCTP_FR_CWND_REPORT);
518 tv.tv_sec = cur_rto / 1000000;
519 tv.tv_usec = cur_rto % 1000000;
521 timevalsub(&min_wait, &tv);
522 if (min_wait.tv_sec < 0 || min_wait.tv_usec < 0) {
524 * if we hit here, we don't have enough seconds on the clock
525 * to account for the RTO. We just let the lower seconds be
526 * the bounds and don't worry about it. This may mean we
527 * will mark a lot more than we should.
529 min_wait.tv_sec = min_wait.tv_usec = 0;
531 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
532 sctp_log_fr(cur_rto, now.tv_sec, now.tv_usec, SCTP_FR_T3_MARK_TIME);
533 sctp_log_fr(0, min_wait.tv_sec, min_wait.tv_usec, SCTP_FR_T3_MARK_TIME);
536 * Our rwnd will be incorrect here since we are not adding back the
537 * cnt * mbuf but we will fix that down below.
539 orig_flight = net->flight_size;
540 orig_tf = stcb->asoc.total_flight;
542 net->fast_retran_ip = 0;
543 /* Now on to each chunk */
546 tsnfirst = tsnlast = 0;
550 TAILQ_FOREACH_SAFE(chk, &stcb->asoc.sent_queue, sctp_next, nchk) {
551 if (SCTP_TSN_GE(stcb->asoc.last_acked_seq, chk->rec.data.TSN_seq)) {
552 /* Strange case our list got out of order? */
553 SCTP_PRINTF("Our list is out of order? last_acked:%x chk:%x",
554 (unsigned int)stcb->asoc.last_acked_seq, (unsigned int)chk->rec.data.TSN_seq);
557 panic("last acked >= chk on sent-Q");
559 SCTP_PRINTF("Recover attempts a restart cnt:%d\n", recovery_cnt);
560 sctp_recover_sent_list(stcb);
561 if (recovery_cnt < 10) {
564 SCTP_PRINTF("Recovery fails %d times??\n", recovery_cnt);
568 if ((chk->whoTo == net) && (chk->sent < SCTP_DATAGRAM_ACKED)) {
570 * found one to mark: If it is less than
571 * DATAGRAM_ACKED it MUST not be a skipped or marked
572 * TSN but instead one that is either already set
573 * for retransmission OR one that needs
577 /* validate its been outstanding long enough */
578 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
579 sctp_log_fr(chk->rec.data.TSN_seq,
580 chk->sent_rcv_time.tv_sec,
581 chk->sent_rcv_time.tv_usec,
582 SCTP_FR_T3_MARK_TIME);
584 if ((chk->sent_rcv_time.tv_sec > min_wait.tv_sec) && (window_probe == 0)) {
586 * we have reached a chunk that was sent
587 * some seconds past our min.. forget it we
588 * will find no more to send.
590 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
592 chk->sent_rcv_time.tv_sec,
593 chk->sent_rcv_time.tv_usec,
597 } else if ((chk->sent_rcv_time.tv_sec == min_wait.tv_sec) &&
598 (window_probe == 0)) {
600 * we must look at the micro seconds to
603 if (chk->sent_rcv_time.tv_usec >= min_wait.tv_usec) {
605 * ok it was sent after our boundary
611 if (stcb->asoc.peer_supports_prsctp && PR_SCTP_TTL_ENABLED(chk->flags)) {
613 if (timevalcmp(&now, &chk->rec.data.timetodrop, >)) {
616 (void)sctp_release_pr_sctp_chunk(stcb,
618 (SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT),
625 if (stcb->asoc.peer_supports_prsctp && PR_SCTP_RTX_ENABLED(chk->flags)) {
626 /* Has it been retransmitted tv_sec times? */
627 if (chk->snd_count > chk->rec.data.timetodrop.tv_sec) {
629 (void)sctp_release_pr_sctp_chunk(stcb,
631 (SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT),
638 if (chk->sent < SCTP_DATAGRAM_RESEND) {
639 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
643 tsnfirst = chk->rec.data.TSN_seq;
645 tsnlast = chk->rec.data.TSN_seq;
646 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
647 sctp_log_fr(chk->rec.data.TSN_seq, chk->snd_count,
648 0, SCTP_FR_T3_MARKED);
650 if (chk->rec.data.chunk_was_revoked) {
651 /* deflate the cwnd */
652 chk->whoTo->cwnd -= chk->book_size;
653 chk->rec.data.chunk_was_revoked = 0;
655 net->marked_retrans++;
656 stcb->asoc.marked_retrans++;
657 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
658 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_RSND_TO,
659 chk->whoTo->flight_size,
661 (uintptr_t) chk->whoTo,
662 chk->rec.data.TSN_seq);
664 sctp_flight_size_decrease(chk);
665 sctp_total_flight_decrease(stcb, chk);
666 stcb->asoc.peers_rwnd += chk->send_size;
667 stcb->asoc.peers_rwnd += SCTP_BASE_SYSCTL(sctp_peer_chunk_oh);
669 chk->sent = SCTP_DATAGRAM_RESEND;
670 SCTP_STAT_INCR(sctps_markedretrans);
672 /* reset the TSN for striking and other FR stuff */
673 chk->rec.data.doing_fast_retransmit = 0;
674 /* Clear any time so NO RTT is being done */
677 if (chk->whoTo->rto_needed == 0) {
678 chk->whoTo->rto_needed = 1;
683 sctp_free_remote_addr(chk->whoTo);
684 chk->no_fr_allowed = 1;
686 atomic_add_int(&alt->ref_count, 1);
688 chk->no_fr_allowed = 0;
689 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
690 chk->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
692 chk->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
696 * CMT: Do not allow FRs on retransmitted TSNs.
698 if (stcb->asoc.sctp_cmt_on_off > 0) {
699 chk->no_fr_allowed = 1;
701 #ifdef THIS_SHOULD_NOT_BE_DONE
702 } else if (chk->sent == SCTP_DATAGRAM_ACKED) {
703 /* remember highest acked one */
707 if (chk->sent == SCTP_DATAGRAM_RESEND) {
711 if ((orig_flight - net->flight_size) != (orig_tf - stcb->asoc.total_flight)) {
712 /* we did not subtract the same things? */
715 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
716 sctp_log_fr(tsnfirst, tsnlast, num_mk, SCTP_FR_T3_TIMEOUT);
720 SCTPDBG(SCTP_DEBUG_TIMER1, "LAST TSN marked was %x\n",
722 SCTPDBG(SCTP_DEBUG_TIMER1, "Num marked for retransmission was %d peer-rwd:%ld\n",
723 num_mk, (u_long)stcb->asoc.peers_rwnd);
724 SCTPDBG(SCTP_DEBUG_TIMER1, "LAST TSN marked was %x\n",
726 SCTPDBG(SCTP_DEBUG_TIMER1, "Num marked for retransmission was %d peer-rwd:%d\n",
728 (int)stcb->asoc.peers_rwnd);
731 *num_marked = num_mk;
732 *num_abandoned = cnt_abandoned;
734 * Now check for a ECN Echo that may be stranded And include the
735 * cnt_mk'd to have all resends in the control queue.
737 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
738 if (chk->sent == SCTP_DATAGRAM_RESEND) {
741 if ((chk->whoTo == net) &&
742 (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
743 sctp_free_remote_addr(chk->whoTo);
745 if (chk->sent != SCTP_DATAGRAM_RESEND) {
746 chk->sent = SCTP_DATAGRAM_RESEND;
747 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
750 atomic_add_int(&alt->ref_count, 1);
753 #ifdef THIS_SHOULD_NOT_BE_DONE
754 if ((stcb->asoc.sent_queue_retran_cnt == 0) && (could_be_sent)) {
755 /* fix it so we retransmit the highest acked anyway */
756 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
758 could_be_sent->sent = SCTP_DATAGRAM_RESEND;
761 if (stcb->asoc.sent_queue_retran_cnt != cnt_mk) {
763 SCTP_PRINTF("Local Audit says there are %d for retran asoc cnt:%d we marked:%d this time\n",
764 cnt_mk, stcb->asoc.sent_queue_retran_cnt, num_mk);
766 #ifndef SCTP_AUDITING_ENABLED
767 stcb->asoc.sent_queue_retran_cnt = cnt_mk;
771 SCTPDBG(SCTP_DEBUG_TIMER4,
772 "Audit total flight due to negative value net:%p\n",
774 stcb->asoc.total_flight = 0;
775 stcb->asoc.total_flight_count = 0;
776 /* Clear all networks flight size */
777 TAILQ_FOREACH(lnets, &stcb->asoc.nets, sctp_next) {
778 lnets->flight_size = 0;
779 SCTPDBG(SCTP_DEBUG_TIMER4,
780 "Net:%p c-f cwnd:%d ssthresh:%d\n",
781 lnets, lnets->cwnd, lnets->ssthresh);
783 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
784 if (chk->sent < SCTP_DATAGRAM_RESEND) {
785 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
786 sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
787 chk->whoTo->flight_size,
789 (uintptr_t) chk->whoTo,
790 chk->rec.data.TSN_seq);
792 sctp_flight_size_increase(chk);
793 sctp_total_flight_increase(stcb, chk);
797 /* We return 1 if we only have a window probe outstanding */
803 sctp_t3rxt_timer(struct sctp_inpcb *inp,
804 struct sctp_tcb *stcb,
805 struct sctp_nets *net)
807 struct sctp_nets *alt;
808 int win_probe, num_mk, num_abandoned;
810 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
811 sctp_log_fr(0, 0, 0, SCTP_FR_T3_TIMEOUT);
813 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
814 struct sctp_nets *lnet;
816 TAILQ_FOREACH(lnet, &stcb->asoc.nets, sctp_next) {
818 sctp_log_cwnd(stcb, lnet, 1, SCTP_CWND_LOG_FROM_T3);
820 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_LOG_FROM_T3);
824 /* Find an alternate and mark those for retransmission */
825 if ((stcb->asoc.peers_rwnd == 0) &&
826 (stcb->asoc.total_flight < net->mtu)) {
827 SCTP_STAT_INCR(sctps_timowindowprobe);
833 if (win_probe == 0) {
834 /* We don't do normal threshold management on window probes */
835 if (sctp_threshold_management(inp, stcb, net,
836 stcb->asoc.max_send_times)) {
837 /* Association was destroyed */
840 if (net != stcb->asoc.primary_destination) {
841 /* send a immediate HB if our RTO is stale */
843 unsigned int ms_goneby;
845 (void)SCTP_GETTIME_TIMEVAL(&now);
846 if (net->last_sent_time.tv_sec) {
847 ms_goneby = (now.tv_sec - net->last_sent_time.tv_sec) * 1000;
851 if ((net->dest_state & SCTP_ADDR_PF) == 0) {
852 if ((ms_goneby > net->RTO) || (net->RTO == 0)) {
854 * no recent feed back in an
855 * RTO or more, request a
858 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
865 * For a window probe we don't penalize the net's but only
866 * the association. This may fail it if SACKs are not coming
867 * back. If sack's are coming with rwnd locked at 0, we will
868 * continue to hold things waiting for rwnd to raise
870 if (sctp_threshold_management(inp, stcb, NULL,
871 stcb->asoc.max_send_times)) {
872 /* Association was destroyed */
876 if (stcb->asoc.sctp_cmt_on_off > 0) {
877 if (net->pf_threshold < net->failure_threshold) {
878 alt = sctp_find_alternate_net(stcb, net, 2);
881 * CMT: Using RTX_SSTHRESH policy for CMT. If CMT is
882 * being used, then pick dest with largest ssthresh
883 * for any retransmission.
885 alt = sctp_find_alternate_net(stcb, net, 1);
887 * CUCv2: If a different dest is picked for the
888 * retransmission, then new (rtx-)pseudo_cumack
889 * needs to be tracked for orig dest. Let CUCv2
890 * track new (rtx-) pseudo-cumack always.
892 net->find_pseudo_cumack = 1;
893 net->find_rtx_pseudo_cumack = 1;
896 alt = sctp_find_alternate_net(stcb, net, 0);
901 (void)sctp_mark_all_for_resend(stcb, net, alt, win_probe,
902 &num_mk, &num_abandoned);
903 /* FR Loss recovery just ended with the T3. */
904 stcb->asoc.fast_retran_loss_recovery = 0;
906 /* CMT FR loss recovery ended with the T3 */
907 net->fast_retran_loss_recovery = 0;
908 if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
909 (net->flight_size == 0)) {
910 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
913 * setup the sat loss recovery that prevents satellite cwnd advance.
915 stcb->asoc.sat_t3_loss_recovery = 1;
916 stcb->asoc.sat_t3_recovery_tsn = stcb->asoc.sending_seq;
918 /* Backoff the timer and cwnd */
919 sctp_backoff_on_timeout(stcb, net, win_probe, num_mk, num_abandoned);
920 if ((!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
921 (net->dest_state & SCTP_ADDR_PF)) {
922 /* Move all pending over too */
923 sctp_move_chunks_from_net(stcb, net);
926 * Get the address that failed, to force a new src address
927 * selecton and a route allocation.
929 if (net->ro._s_addr) {
930 sctp_free_ifa(net->ro._s_addr);
931 net->ro._s_addr = NULL;
933 net->src_addr_selected = 0;
935 /* Force a route allocation too */
937 RTFREE(net->ro.ro_rt);
938 net->ro.ro_rt = NULL;
940 /* Was it our primary? */
941 if ((stcb->asoc.primary_destination == net) && (alt != net)) {
943 * Yes, note it as such and find an alternate note:
944 * this means HB code must use this to resent the
945 * primary if it goes active AND if someone does a
946 * change-primary then this flag must be cleared
947 * from any net structures.
949 if (stcb->asoc.alternate) {
950 sctp_free_remote_addr(stcb->asoc.alternate);
952 stcb->asoc.alternate = alt;
953 atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
957 * Special case for cookie-echo'ed case, we don't do output but must
958 * await the COOKIE-ACK before retransmission
960 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
962 * Here we just reset the timer and start again since we
963 * have not established the asoc
965 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
968 if (stcb->asoc.peer_supports_prsctp) {
969 struct sctp_tmit_chunk *lchk;
971 lchk = sctp_try_advance_peer_ack_point(stcb, &stcb->asoc);
972 /* C3. See if we need to send a Fwd-TSN */
973 if (SCTP_TSN_GT(stcb->asoc.advanced_peer_ack_point, stcb->asoc.last_acked_seq)) {
974 send_forward_tsn(stcb, &stcb->asoc);
976 /* Assure a timer is up */
977 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, lchk->whoTo);
981 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
982 sctp_log_cwnd(stcb, net, net->cwnd, SCTP_CWND_LOG_FROM_RTX);
988 sctp_t1init_timer(struct sctp_inpcb *inp,
989 struct sctp_tcb *stcb,
990 struct sctp_nets *net)
992 /* bump the thresholds */
993 if (stcb->asoc.delayed_connection) {
995 * special hook for delayed connection. The library did NOT
996 * complete the rest of its sends.
998 stcb->asoc.delayed_connection = 0;
999 sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
1002 if (SCTP_GET_STATE((&stcb->asoc)) != SCTP_STATE_COOKIE_WAIT) {
1005 if (sctp_threshold_management(inp, stcb, net,
1006 stcb->asoc.max_init_times)) {
1007 /* Association was destroyed */
1010 stcb->asoc.dropped_special_cnt = 0;
1011 sctp_backoff_on_timeout(stcb, stcb->asoc.primary_destination, 1, 0, 0);
1012 if (stcb->asoc.initial_init_rto_max < net->RTO) {
1013 net->RTO = stcb->asoc.initial_init_rto_max;
1015 if (stcb->asoc.numnets > 1) {
1016 /* If we have more than one addr use it */
1017 struct sctp_nets *alt;
1019 alt = sctp_find_alternate_net(stcb, stcb->asoc.primary_destination, 0);
1020 if (alt != stcb->asoc.primary_destination) {
1021 sctp_move_chunks_from_net(stcb, stcb->asoc.primary_destination);
1022 stcb->asoc.primary_destination = alt;
1025 /* Send out a new init */
1026 sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
1031 * For cookie and asconf we actually need to find and mark for resend, then
1032 * increment the resend counter (after all the threshold management stuff of
1036 sctp_cookie_timer(struct sctp_inpcb *inp,
1037 struct sctp_tcb *stcb,
1038 struct sctp_nets *net)
1040 struct sctp_nets *alt;
1041 struct sctp_tmit_chunk *cookie;
1043 /* first before all else we must find the cookie */
1044 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, sctp_next) {
1045 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
1049 if (cookie == NULL) {
1050 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
1054 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)),
1055 0, M_DONTWAIT, 1, MT_DATA);
1057 struct sctp_paramhdr *ph;
1060 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
1062 ph = mtod(oper, struct sctp_paramhdr *);
1063 ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
1064 ph->param_length = htons(SCTP_BUF_LEN(oper));
1065 ippp = (uint32_t *) (ph + 1);
1066 *ippp = htonl(SCTP_FROM_SCTP_TIMER + SCTP_LOC_3);
1068 inp->last_abort_code = SCTP_FROM_SCTP_TIMER + SCTP_LOC_4;
1069 sctp_abort_an_association(inp, stcb, SCTP_INTERNAL_ERROR,
1070 oper, SCTP_SO_NOT_LOCKED);
1073 panic("Cookie timer expires in wrong state?");
1075 SCTP_PRINTF("Strange in state %d not cookie-echoed yet c-e timer expires?\n", SCTP_GET_STATE(&stcb->asoc));
1081 /* Ok we found the cookie, threshold management next */
1082 if (sctp_threshold_management(inp, stcb, cookie->whoTo,
1083 stcb->asoc.max_init_times)) {
1088 * cleared theshold management now lets backoff the address & select
1091 stcb->asoc.dropped_special_cnt = 0;
1092 sctp_backoff_on_timeout(stcb, cookie->whoTo, 1, 0, 0);
1093 alt = sctp_find_alternate_net(stcb, cookie->whoTo, 0);
1094 if (alt != cookie->whoTo) {
1095 sctp_free_remote_addr(cookie->whoTo);
1096 cookie->whoTo = alt;
1097 atomic_add_int(&alt->ref_count, 1);
1099 /* Now mark the retran info */
1100 if (cookie->sent != SCTP_DATAGRAM_RESEND) {
1101 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1103 cookie->sent = SCTP_DATAGRAM_RESEND;
1105 * Now call the output routine to kick out the cookie again, Note we
1106 * don't mark any chunks for retran so that FR will need to kick in
1107 * to move these (or a send timer).
1113 sctp_strreset_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1114 struct sctp_nets *net)
1116 struct sctp_nets *alt;
1117 struct sctp_tmit_chunk *strrst = NULL, *chk = NULL;
1119 if (stcb->asoc.stream_reset_outstanding == 0) {
1122 /* find the existing STRRESET, we use the seq number we sent out on */
1123 (void)sctp_find_stream_reset(stcb, stcb->asoc.str_reset_seq_out, &strrst);
1124 if (strrst == NULL) {
1127 /* do threshold management */
1128 if (sctp_threshold_management(inp, stcb, strrst->whoTo,
1129 stcb->asoc.max_send_times)) {
1134 * cleared theshold management now lets backoff the address & select
1137 sctp_backoff_on_timeout(stcb, strrst->whoTo, 1, 0, 0);
1138 alt = sctp_find_alternate_net(stcb, strrst->whoTo, 0);
1139 sctp_free_remote_addr(strrst->whoTo);
1140 strrst->whoTo = alt;
1141 atomic_add_int(&alt->ref_count, 1);
1143 /* See if a ECN Echo is also stranded */
1144 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
1145 if ((chk->whoTo == net) &&
1146 (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
1147 sctp_free_remote_addr(chk->whoTo);
1148 if (chk->sent != SCTP_DATAGRAM_RESEND) {
1149 chk->sent = SCTP_DATAGRAM_RESEND;
1150 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1153 atomic_add_int(&alt->ref_count, 1);
1156 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
1158 * If the address went un-reachable, we need to move to
1159 * alternates for ALL chk's in queue
1161 sctp_move_chunks_from_net(stcb, net);
1163 /* mark the retran info */
1164 if (strrst->sent != SCTP_DATAGRAM_RESEND)
1165 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1166 strrst->sent = SCTP_DATAGRAM_RESEND;
1168 /* restart the timer */
1169 sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, inp, stcb, strrst->whoTo);
1174 sctp_asconf_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1175 struct sctp_nets *net)
1177 struct sctp_nets *alt;
1178 struct sctp_tmit_chunk *asconf, *chk;
1180 /* is this a first send, or a retransmission? */
1181 if (TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) {
1182 /* compose a new ASCONF chunk and send it */
1183 sctp_send_asconf(stcb, net, SCTP_ADDR_NOT_LOCKED);
1186 * Retransmission of the existing ASCONF is needed
1189 /* find the existing ASCONF */
1190 asconf = TAILQ_FIRST(&stcb->asoc.asconf_send_queue);
1191 if (asconf == NULL) {
1194 /* do threshold management */
1195 if (sctp_threshold_management(inp, stcb, asconf->whoTo,
1196 stcb->asoc.max_send_times)) {
1200 if (asconf->snd_count > stcb->asoc.max_send_times) {
1202 * Something is rotten: our peer is not responding
1203 * to ASCONFs but apparently is to other chunks.
1204 * i.e. it is not properly handling the chunk type
1205 * upper bits. Mark this peer as ASCONF incapable
1208 SCTPDBG(SCTP_DEBUG_TIMER1, "asconf_timer: Peer has not responded to our repeated ASCONFs\n");
1209 sctp_asconf_cleanup(stcb, net);
1213 * cleared threshold management, so now backoff the net and
1214 * select an alternate
1216 sctp_backoff_on_timeout(stcb, asconf->whoTo, 1, 0, 0);
1217 alt = sctp_find_alternate_net(stcb, asconf->whoTo, 0);
1218 if (asconf->whoTo != alt) {
1219 sctp_free_remote_addr(asconf->whoTo);
1220 asconf->whoTo = alt;
1221 atomic_add_int(&alt->ref_count, 1);
1223 /* See if an ECN Echo is also stranded */
1224 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
1225 if ((chk->whoTo == net) &&
1226 (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
1227 sctp_free_remote_addr(chk->whoTo);
1229 if (chk->sent != SCTP_DATAGRAM_RESEND) {
1230 chk->sent = SCTP_DATAGRAM_RESEND;
1231 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1233 atomic_add_int(&alt->ref_count, 1);
1236 TAILQ_FOREACH(chk, &stcb->asoc.asconf_send_queue, sctp_next) {
1237 if (chk->whoTo != alt) {
1238 sctp_free_remote_addr(chk->whoTo);
1240 atomic_add_int(&alt->ref_count, 1);
1242 if (asconf->sent != SCTP_DATAGRAM_RESEND && chk->sent != SCTP_DATAGRAM_UNSENT)
1243 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1244 chk->sent = SCTP_DATAGRAM_RESEND;
1246 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
1248 * If the address went un-reachable, we need to move
1249 * to the alternate for ALL chunks in queue
1251 sctp_move_chunks_from_net(stcb, net);
1253 /* mark the retran info */
1254 if (asconf->sent != SCTP_DATAGRAM_RESEND)
1255 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1256 asconf->sent = SCTP_DATAGRAM_RESEND;
1258 /* send another ASCONF if any and we can do */
1259 sctp_send_asconf(stcb, alt, SCTP_ADDR_NOT_LOCKED);
1264 /* Mobility adaptation */
1266 sctp_delete_prim_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1267 struct sctp_nets *net)
1269 if (stcb->asoc.deleted_primary == NULL) {
1270 SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: deleted_primary is not stored...\n");
1271 sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
1274 SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: finished to keep deleted primary ");
1275 SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, &stcb->asoc.deleted_primary->ro._l_addr.sa);
1276 sctp_free_remote_addr(stcb->asoc.deleted_primary);
1277 stcb->asoc.deleted_primary = NULL;
1278 sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
1283 * For the shutdown and shutdown-ack, we do not keep one around on the
1284 * control queue. This means we must generate a new one and call the general
1285 * chunk output routine, AFTER having done threshold management.
1286 * It is assumed that net is non-NULL.
1289 sctp_shutdown_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1290 struct sctp_nets *net)
1292 struct sctp_nets *alt;
1294 /* first threshold managment */
1295 if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
1299 sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
1300 /* second select an alternative */
1301 alt = sctp_find_alternate_net(stcb, net, 0);
1303 /* third generate a shutdown into the queue for out net */
1304 sctp_send_shutdown(stcb, alt);
1306 /* fourth restart timer */
1307 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, inp, stcb, alt);
1312 sctp_shutdownack_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1313 struct sctp_nets *net)
1315 struct sctp_nets *alt;
1317 /* first threshold managment */
1318 if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
1322 sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
1323 /* second select an alternative */
1324 alt = sctp_find_alternate_net(stcb, net, 0);
1326 /* third generate a shutdown into the queue for out net */
1327 sctp_send_shutdown_ack(stcb, alt);
1329 /* fourth restart timer */
1330 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, inp, stcb, alt);
1335 sctp_audit_stream_queues_for_size(struct sctp_inpcb *inp,
1336 struct sctp_tcb *stcb)
1338 struct sctp_stream_queue_pending *sp;
1339 unsigned int i, chks_in_queue = 0;
1340 int being_filled = 0;
1343 * This function is ONLY called when the send/sent queues are empty.
1345 if ((stcb == NULL) || (inp == NULL))
1348 if (stcb->asoc.sent_queue_retran_cnt) {
1349 SCTP_PRINTF("Hmm, sent_queue_retran_cnt is non-zero %d\n",
1350 stcb->asoc.sent_queue_retran_cnt);
1351 stcb->asoc.sent_queue_retran_cnt = 0;
1353 if (stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
1354 /* No stream scheduler information, initialize scheduler */
1355 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 0);
1356 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
1357 /* yep, we lost a stream or two */
1358 SCTP_PRINTF("Found additional streams NOT managed by scheduler, corrected\n");
1360 /* no streams lost */
1361 stcb->asoc.total_output_queue_size = 0;
1364 /* Check to see if some data queued, if so report it */
1365 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1366 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
1367 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
1368 if (sp->msg_is_complete)
1374 if (chks_in_queue != stcb->asoc.stream_queue_cnt) {
1375 SCTP_PRINTF("Hmm, stream queue cnt at %d I counted %d in stream out wheel\n",
1376 stcb->asoc.stream_queue_cnt, chks_in_queue);
1378 if (chks_in_queue) {
1379 /* call the output queue function */
1380 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_T3, SCTP_SO_NOT_LOCKED);
1381 if ((TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
1382 (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
1384 * Probably should go in and make it go back through
1385 * and add fragments allowed
1387 if (being_filled == 0) {
1388 SCTP_PRINTF("Still nothing moved %d chunks are stuck\n",
1393 SCTP_PRINTF("Found no chunks on any queue tot:%lu\n",
1394 (u_long)stcb->asoc.total_output_queue_size);
1395 stcb->asoc.total_output_queue_size = 0;
1400 sctp_heartbeat_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1401 struct sctp_nets *net)
1407 if (net->dest_state & SCTP_ADDR_PF) {
1410 if (net->hb_responded == 0) {
1411 if (net->ro._s_addr) {
1413 * Invalidate the src address if we did not
1414 * get a response last time.
1416 sctp_free_ifa(net->ro._s_addr);
1417 net->ro._s_addr = NULL;
1418 net->src_addr_selected = 0;
1420 sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
1421 if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
1426 /* Zero PBA, if it needs it */
1427 if (net->partial_bytes_acked) {
1428 net->partial_bytes_acked = 0;
1431 if ((stcb->asoc.total_output_queue_size > 0) &&
1432 (TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
1433 (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
1434 sctp_audit_stream_queues_for_size(inp, stcb);
1436 if (!(net->dest_state & SCTP_ADDR_NOHB) &&
1437 !((net_was_pf == 0) && (net->dest_state & SCTP_ADDR_PF))) {
1439 * when move to PF during threshold mangement, a HB has been
1440 * queued in that routine
1442 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
1448 sctp_pathmtu_timer(struct sctp_inpcb *inp,
1449 struct sctp_tcb *stcb,
1450 struct sctp_nets *net)
1452 uint32_t next_mtu, mtu;
1454 next_mtu = sctp_get_next_mtu(inp, net->mtu);
1456 if ((next_mtu > net->mtu) && (net->port == 0)) {
1457 if ((net->src_addr_selected == 0) ||
1458 (net->ro._s_addr == NULL) ||
1459 (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
1460 if ((net->ro._s_addr != NULL) && (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
1461 sctp_free_ifa(net->ro._s_addr);
1462 net->ro._s_addr = NULL;
1463 net->src_addr_selected = 0;
1464 } else if (net->ro._s_addr == NULL) {
1465 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
1466 if (net->ro._l_addr.sa.sa_family == AF_INET6) {
1467 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1469 /* KAME hack: embed scopeid */
1470 (void)sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
1474 net->ro._s_addr = sctp_source_address_selection(inp,
1476 (sctp_route_t *) & net->ro,
1477 net, 0, stcb->asoc.vrf_id);
1478 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
1479 if (net->ro._l_addr.sa.sa_family == AF_INET6) {
1480 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1482 (void)sa6_recoverscope(sin6);
1486 if (net->ro._s_addr)
1487 net->src_addr_selected = 1;
1489 if (net->ro._s_addr) {
1490 mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._s_addr.sa, net->ro.ro_rt);
1492 mtu -= sizeof(struct udphdr);
1494 if (mtu > next_mtu) {
1495 net->mtu = next_mtu;
1499 /* restart the timer */
1500 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net);
1504 sctp_autoclose_timer(struct sctp_inpcb *inp,
1505 struct sctp_tcb *stcb,
1506 struct sctp_nets *net)
1508 struct timeval tn, *tim_touse;
1509 struct sctp_association *asoc;
1512 (void)SCTP_GETTIME_TIMEVAL(&tn);
1513 if (stcb->asoc.sctp_autoclose_ticks &&
1514 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1515 /* Auto close is on */
1517 /* pick the time to use */
1518 if (asoc->time_last_rcvd.tv_sec >
1519 asoc->time_last_sent.tv_sec) {
1520 tim_touse = &asoc->time_last_rcvd;
1522 tim_touse = &asoc->time_last_sent;
1524 /* Now has long enough transpired to autoclose? */
1525 ticks_gone_by = SEC_TO_TICKS(tn.tv_sec - tim_touse->tv_sec);
1526 if ((ticks_gone_by > 0) &&
1527 (ticks_gone_by >= (int)asoc->sctp_autoclose_ticks)) {
1529 * autoclose time has hit, call the output routine,
1530 * which should do nothing just to be SURE we don't
1531 * have hanging data. We can then safely check the
1532 * queues and know that we are clear to send
1535 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_AUTOCLOSE_TMR, SCTP_SO_NOT_LOCKED);
1537 if (TAILQ_EMPTY(&asoc->send_queue) &&
1538 TAILQ_EMPTY(&asoc->sent_queue)) {
1540 * there is nothing queued to send, so I'm
1543 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
1544 /* only send SHUTDOWN 1st time thru */
1545 struct sctp_nets *netp;
1547 if (stcb->asoc.alternate) {
1548 netp = stcb->asoc.alternate;
1550 netp = stcb->asoc.primary_destination;
1552 sctp_send_shutdown(stcb, netp);
1553 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
1554 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
1555 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
1557 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
1558 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
1559 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
1560 stcb->sctp_ep, stcb,
1562 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1563 stcb->sctp_ep, stcb,
1569 * No auto close at this time, reset t-o to check
1574 /* fool the timer startup to use the time left */
1575 tmp = asoc->sctp_autoclose_ticks;
1576 asoc->sctp_autoclose_ticks -= ticks_gone_by;
1577 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1579 /* restore the real tick value */
1580 asoc->sctp_autoclose_ticks = tmp;