2 * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
3 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
4 * Copyright (c) 2008-2012, 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 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
37 #include <netinet/sctp_os.h>
38 #include <netinet/sctp_pcb.h>
41 #include <netinet/sctp_var.h>
42 #include <netinet/sctp_sysctl.h>
43 #include <netinet/sctp_timer.h>
44 #include <netinet/sctputil.h>
45 #include <netinet/sctp_output.h>
46 #include <netinet/sctp_header.h>
47 #include <netinet/sctp_indata.h>
48 #include <netinet/sctp_asconf.h>
49 #include <netinet/sctp_input.h>
50 #include <netinet/sctp.h>
51 #include <netinet/sctp_uio.h>
52 #include <netinet/udp.h>
56 sctp_audit_retranmission_queue(struct sctp_association *asoc)
58 struct sctp_tmit_chunk *chk;
60 SCTPDBG(SCTP_DEBUG_TIMER4, "Audit invoked on send queue cnt:%d onqueue:%d\n",
61 asoc->sent_queue_retran_cnt,
62 asoc->sent_queue_cnt);
63 asoc->sent_queue_retran_cnt = 0;
64 asoc->sent_queue_cnt = 0;
65 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
66 if (chk->sent == SCTP_DATAGRAM_RESEND) {
67 sctp_ucount_incr(asoc->sent_queue_retran_cnt);
69 asoc->sent_queue_cnt++;
71 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
72 if (chk->sent == SCTP_DATAGRAM_RESEND) {
73 sctp_ucount_incr(asoc->sent_queue_retran_cnt);
76 TAILQ_FOREACH(chk, &asoc->asconf_send_queue, sctp_next) {
77 if (chk->sent == SCTP_DATAGRAM_RESEND) {
78 sctp_ucount_incr(asoc->sent_queue_retran_cnt);
81 SCTPDBG(SCTP_DEBUG_TIMER4, "Audit completes retran:%d onqueue:%d\n",
82 asoc->sent_queue_retran_cnt,
83 asoc->sent_queue_cnt);
87 sctp_threshold_management(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
88 struct sctp_nets *net, uint16_t threshold)
92 SCTPDBG(SCTP_DEBUG_TIMER4, "Error count for %p now %d thresh:%d\n",
93 (void *)net, net->error_count,
94 net->failure_threshold);
95 if (net->error_count > net->failure_threshold) {
96 /* We had a threshold failure */
97 if (net->dest_state & SCTP_ADDR_REACHABLE) {
98 net->dest_state &= ~SCTP_ADDR_REACHABLE;
99 net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
100 net->dest_state &= ~SCTP_ADDR_PF;
101 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
103 (void *)net, SCTP_SO_NOT_LOCKED);
105 } else if ((net->pf_threshold < net->failure_threshold) &&
106 (net->error_count > net->pf_threshold)) {
107 if (!(net->dest_state & SCTP_ADDR_PF)) {
108 net->dest_state |= SCTP_ADDR_PF;
109 net->last_active = sctp_get_tick_count();
110 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
111 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_TIMER + SCTP_LOC_3);
112 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
120 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0) {
121 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
122 sctp_misc_ints(SCTP_THRESHOLD_INCR,
123 stcb->asoc.overall_error_count,
124 (stcb->asoc.overall_error_count + 1),
125 SCTP_FROM_SCTP_TIMER,
128 stcb->asoc.overall_error_count++;
131 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
132 sctp_misc_ints(SCTP_THRESHOLD_INCR,
133 stcb->asoc.overall_error_count,
134 (stcb->asoc.overall_error_count + 1),
135 SCTP_FROM_SCTP_TIMER,
138 stcb->asoc.overall_error_count++;
140 SCTPDBG(SCTP_DEBUG_TIMER4, "Overall error count for %p now %d thresh:%u state:%x\n",
141 (void *)&stcb->asoc, stcb->asoc.overall_error_count,
142 (uint32_t) threshold,
143 ((net == NULL) ? (uint32_t) 0 : (uint32_t) net->dest_state));
145 * We specifically do not do >= to give the assoc one more change
148 if (stcb->asoc.overall_error_count > threshold) {
149 /* Abort notification sends a ULP notify */
152 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)),
153 0, M_NOWAIT, 1, MT_DATA);
155 struct sctp_paramhdr *ph;
158 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
160 ph = mtod(oper, struct sctp_paramhdr *);
161 ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
162 ph->param_length = htons(SCTP_BUF_LEN(oper));
163 ippp = (uint32_t *) (ph + 1);
164 *ippp = htonl(SCTP_FROM_SCTP_TIMER + SCTP_LOC_1);
166 inp->last_abort_code = SCTP_FROM_SCTP_TIMER + SCTP_LOC_1;
167 sctp_abort_an_association(inp, stcb, oper, SCTP_SO_NOT_LOCKED);
174 * sctp_find_alternate_net() returns a non-NULL pointer as long
175 * the argument net is non-NULL.
178 sctp_find_alternate_net(struct sctp_tcb *stcb,
179 struct sctp_nets *net,
182 /* Find and return an alternate network if possible */
183 struct sctp_nets *alt, *mnet, *min_errors_net = NULL, *max_cwnd_net = NULL;
186 /* JRS 5/14/07 - Initialize min_errors to an impossible value. */
188 uint32_t max_cwnd = 0;
190 if (stcb->asoc.numnets == 1) {
191 /* No others but net */
192 return (TAILQ_FIRST(&stcb->asoc.nets));
195 * JRS 5/14/07 - If mode is set to 2, use the CMT PF find alternate
196 * net algorithm. This algorithm chooses the active destination (not
197 * in PF state) with the largest cwnd value. If all destinations are
198 * in PF state, unreachable, or unconfirmed, choose the desination
199 * that is in PF state with the lowest error count. In case of a
200 * tie, choose the destination that was most recently active.
203 TAILQ_FOREACH(mnet, &stcb->asoc.nets, sctp_next) {
205 * JRS 5/14/07 - If the destination is unreachable
206 * or unconfirmed, skip it.
208 if (((mnet->dest_state & SCTP_ADDR_REACHABLE) != SCTP_ADDR_REACHABLE) ||
209 (mnet->dest_state & SCTP_ADDR_UNCONFIRMED)) {
213 * JRS 5/14/07 - If the destination is reachable
214 * but in PF state, compare the error count of the
215 * destination to the minimum error count seen thus
216 * far. Store the destination with the lower error
217 * count. If the error counts are equal, store the
218 * destination that was most recently active.
220 if (mnet->dest_state & SCTP_ADDR_PF) {
222 * JRS 5/14/07 - If the destination under
223 * consideration is the current destination,
224 * work as if the error count is one higher.
225 * The actual error count will not be
226 * incremented until later in the t3
230 if (min_errors == -1) {
231 min_errors = mnet->error_count + 1;
232 min_errors_net = mnet;
233 } else if (mnet->error_count + 1 < min_errors) {
234 min_errors = mnet->error_count + 1;
235 min_errors_net = mnet;
236 } else if (mnet->error_count + 1 == min_errors
237 && mnet->last_active > min_errors_net->last_active) {
238 min_errors_net = mnet;
239 min_errors = mnet->error_count + 1;
243 if (min_errors == -1) {
244 min_errors = mnet->error_count;
245 min_errors_net = mnet;
246 } else if (mnet->error_count < min_errors) {
247 min_errors = mnet->error_count;
248 min_errors_net = mnet;
249 } else if (mnet->error_count == min_errors
250 && mnet->last_active > min_errors_net->last_active) {
251 min_errors_net = mnet;
252 min_errors = mnet->error_count;
258 * JRS 5/14/07 - If the destination is reachable and
259 * not in PF state, compare the cwnd of the
260 * destination to the highest cwnd seen thus far.
261 * Store the destination with the higher cwnd value.
262 * If the cwnd values are equal, randomly choose one
263 * of the two destinations.
265 if (max_cwnd < mnet->cwnd) {
267 max_cwnd = mnet->cwnd;
268 } else if (max_cwnd == mnet->cwnd) {
272 if (stcb->asoc.hb_random_idx > 3) {
273 rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
274 memcpy(stcb->asoc.hb_random_values, &rndval, sizeof(stcb->asoc.hb_random_values));
275 this_random = stcb->asoc.hb_random_values[0];
276 stcb->asoc.hb_random_idx++;
277 stcb->asoc.hb_ect_randombit = 0;
279 this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
280 stcb->asoc.hb_random_idx++;
281 stcb->asoc.hb_ect_randombit = 0;
283 if (this_random % 2 == 1) {
285 max_cwnd = mnet->cwnd; /* Useless? */
289 if (max_cwnd_net == NULL) {
290 if (min_errors_net == NULL) {
293 return (min_errors_net);
295 return (max_cwnd_net);
299 * JRS 5/14/07 - If mode is set to 1, use the CMT policy for
300 * choosing an alternate net.
302 else if (mode == 1) {
303 TAILQ_FOREACH(mnet, &stcb->asoc.nets, sctp_next) {
304 if (((mnet->dest_state & SCTP_ADDR_REACHABLE) != SCTP_ADDR_REACHABLE) ||
305 (mnet->dest_state & SCTP_ADDR_UNCONFIRMED)) {
307 * will skip ones that are not-reachable or
312 if (max_cwnd < mnet->cwnd) {
314 max_cwnd = mnet->cwnd;
315 } else if (max_cwnd == mnet->cwnd) {
319 if (stcb->asoc.hb_random_idx > 3) {
320 rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
321 memcpy(stcb->asoc.hb_random_values, &rndval,
322 sizeof(stcb->asoc.hb_random_values));
323 this_random = stcb->asoc.hb_random_values[0];
324 stcb->asoc.hb_random_idx = 0;
325 stcb->asoc.hb_ect_randombit = 0;
327 this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
328 stcb->asoc.hb_random_idx++;
329 stcb->asoc.hb_ect_randombit = 0;
331 if (this_random % 2) {
333 max_cwnd = mnet->cwnd;
338 return (max_cwnd_net);
345 mnet = TAILQ_FIRST(&stcb->asoc.nets);
351 alt = TAILQ_NEXT(mnet, sctp_next);
357 alt = TAILQ_FIRST(&stcb->asoc.nets);
362 if (alt->ro.ro_rt == NULL) {
363 if (alt->ro._s_addr) {
364 sctp_free_ifa(alt->ro._s_addr);
365 alt->ro._s_addr = NULL;
367 alt->src_addr_selected = 0;
369 /* sa_ignore NO_NULL_CHK */
370 if (((alt->dest_state & SCTP_ADDR_REACHABLE) == SCTP_ADDR_REACHABLE) &&
371 (alt->ro.ro_rt != NULL) &&
372 (!(alt->dest_state & SCTP_ADDR_UNCONFIRMED))) {
373 /* Found a reachable address */
377 } while (alt != NULL);
380 /* Case where NO insv network exists (dormant state) */
381 /* we rotate destinations */
386 return (TAILQ_FIRST(&stcb->asoc.nets));
388 alt = TAILQ_NEXT(mnet, sctp_next);
394 alt = TAILQ_FIRST(&stcb->asoc.nets);
396 /* sa_ignore NO_NULL_CHK */
397 if ((!(alt->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
399 /* Found an alternate address */
403 } while (alt != NULL);
412 sctp_backoff_on_timeout(struct sctp_tcb *stcb,
413 struct sctp_nets *net,
415 int num_marked, int num_abandoned)
418 net->RTO = stcb->asoc.minrto;
421 if (net->RTO > stcb->asoc.maxrto) {
422 net->RTO = stcb->asoc.maxrto;
424 if ((win_probe == 0) && (num_marked || num_abandoned)) {
425 /* We don't apply penalty to window probe scenarios */
426 /* JRS - Use the congestion control given in the CC module */
427 stcb->asoc.cc_functions.sctp_cwnd_update_after_timeout(stcb, net);
433 sctp_recover_sent_list(struct sctp_tcb *stcb)
435 struct sctp_tmit_chunk *chk, *nchk;
436 struct sctp_association *asoc;
439 TAILQ_FOREACH_SAFE(chk, &asoc->sent_queue, sctp_next, nchk) {
440 if (SCTP_TSN_GE(asoc->last_acked_seq, chk->rec.data.TSN_seq)) {
441 SCTP_PRINTF("Found chk:%p tsn:%x <= last_acked_seq:%x\n",
442 (void *)chk, chk->rec.data.TSN_seq, asoc->last_acked_seq);
443 if (chk->sent != SCTP_DATAGRAM_NR_ACKED) {
444 if (asoc->strmout[chk->rec.data.stream_number].chunks_on_queues > 0) {
445 asoc->strmout[chk->rec.data.stream_number].chunks_on_queues--;
448 TAILQ_REMOVE(&asoc->sent_queue, chk, sctp_next);
449 if (PR_SCTP_ENABLED(chk->flags)) {
450 if (asoc->pr_sctp_cnt != 0)
454 /* sa_ignore NO_NULL_CHK */
455 sctp_free_bufspace(stcb, asoc, chk, 1);
456 sctp_m_freem(chk->data);
458 if (asoc->peer_supports_prsctp && PR_SCTP_BUF_ENABLED(chk->flags)) {
459 asoc->sent_queue_cnt_removeable--;
462 asoc->sent_queue_cnt--;
463 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
466 SCTP_PRINTF("after recover order is as follows\n");
467 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
468 SCTP_PRINTF("chk:%p TSN:%x\n", (void *)chk, chk->rec.data.TSN_seq);
475 sctp_mark_all_for_resend(struct sctp_tcb *stcb,
476 struct sctp_nets *net,
477 struct sctp_nets *alt,
484 * Mark all chunks (well not all) that were sent to *net for
485 * retransmission. Move them to alt for there destination as well...
486 * We only mark chunks that have been outstanding long enough to
487 * have received feed-back.
489 struct sctp_tmit_chunk *chk, *nchk;
490 struct sctp_nets *lnets;
491 struct timeval now, min_wait, tv;
494 int audit_tf, num_mk, fir;
496 uint32_t orig_flight, orig_tf;
497 uint32_t tsnlast, tsnfirst;
498 int recovery_cnt = 0;
501 /* none in flight now */
505 * figure out how long a data chunk must be pending before we can
508 (void)SCTP_GETTIME_TIMEVAL(&now);
509 /* get cur rto in micro-seconds */
510 cur_rto = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv;
512 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
514 stcb->asoc.peers_rwnd,
516 SCTP_FR_T3_MARK_TIME);
517 sctp_log_fr(net->flight_size, 0, 0, SCTP_FR_CWND_REPORT);
518 sctp_log_fr(net->flight_size, net->cwnd, stcb->asoc.total_flight, SCTP_FR_CWND_REPORT);
520 tv.tv_sec = cur_rto / 1000000;
521 tv.tv_usec = cur_rto % 1000000;
523 timevalsub(&min_wait, &tv);
524 if (min_wait.tv_sec < 0 || min_wait.tv_usec < 0) {
526 * if we hit here, we don't have enough seconds on the clock
527 * to account for the RTO. We just let the lower seconds be
528 * the bounds and don't worry about it. This may mean we
529 * will mark a lot more than we should.
531 min_wait.tv_sec = min_wait.tv_usec = 0;
533 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
534 sctp_log_fr(cur_rto, now.tv_sec, now.tv_usec, SCTP_FR_T3_MARK_TIME);
535 sctp_log_fr(0, min_wait.tv_sec, min_wait.tv_usec, SCTP_FR_T3_MARK_TIME);
538 * Our rwnd will be incorrect here since we are not adding back the
539 * cnt * mbuf but we will fix that down below.
541 orig_flight = net->flight_size;
542 orig_tf = stcb->asoc.total_flight;
544 net->fast_retran_ip = 0;
545 /* Now on to each chunk */
548 tsnfirst = tsnlast = 0;
552 TAILQ_FOREACH_SAFE(chk, &stcb->asoc.sent_queue, sctp_next, nchk) {
553 if (SCTP_TSN_GE(stcb->asoc.last_acked_seq, chk->rec.data.TSN_seq)) {
554 /* Strange case our list got out of order? */
555 SCTP_PRINTF("Our list is out of order? last_acked:%x chk:%x\n",
556 (unsigned int)stcb->asoc.last_acked_seq, (unsigned int)chk->rec.data.TSN_seq);
559 panic("last acked >= chk on sent-Q");
561 SCTP_PRINTF("Recover attempts a restart cnt:%d\n", recovery_cnt);
562 sctp_recover_sent_list(stcb);
563 if (recovery_cnt < 10) {
566 SCTP_PRINTF("Recovery fails %d times??\n", recovery_cnt);
570 if ((chk->whoTo == net) && (chk->sent < SCTP_DATAGRAM_ACKED)) {
572 * found one to mark: If it is less than
573 * DATAGRAM_ACKED it MUST not be a skipped or marked
574 * TSN but instead one that is either already set
575 * for retransmission OR one that needs
579 /* validate its been outstanding long enough */
580 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
581 sctp_log_fr(chk->rec.data.TSN_seq,
582 chk->sent_rcv_time.tv_sec,
583 chk->sent_rcv_time.tv_usec,
584 SCTP_FR_T3_MARK_TIME);
586 if ((chk->sent_rcv_time.tv_sec > min_wait.tv_sec) && (window_probe == 0)) {
588 * we have reached a chunk that was sent
589 * some seconds past our min.. forget it we
590 * will find no more to send.
592 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
594 chk->sent_rcv_time.tv_sec,
595 chk->sent_rcv_time.tv_usec,
599 } else if ((chk->sent_rcv_time.tv_sec == min_wait.tv_sec) &&
600 (window_probe == 0)) {
602 * we must look at the micro seconds to
605 if (chk->sent_rcv_time.tv_usec >= min_wait.tv_usec) {
607 * ok it was sent after our boundary
613 if (stcb->asoc.peer_supports_prsctp && PR_SCTP_TTL_ENABLED(chk->flags)) {
615 if (timevalcmp(&now, &chk->rec.data.timetodrop, >)) {
618 (void)sctp_release_pr_sctp_chunk(stcb,
627 if (stcb->asoc.peer_supports_prsctp && PR_SCTP_RTX_ENABLED(chk->flags)) {
628 /* Has it been retransmitted tv_sec times? */
629 if (chk->snd_count > chk->rec.data.timetodrop.tv_sec) {
631 (void)sctp_release_pr_sctp_chunk(stcb,
640 if (chk->sent < SCTP_DATAGRAM_RESEND) {
641 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
645 tsnfirst = chk->rec.data.TSN_seq;
647 tsnlast = chk->rec.data.TSN_seq;
648 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
649 sctp_log_fr(chk->rec.data.TSN_seq, chk->snd_count,
650 0, SCTP_FR_T3_MARKED);
652 if (chk->rec.data.chunk_was_revoked) {
653 /* deflate the cwnd */
654 chk->whoTo->cwnd -= chk->book_size;
655 chk->rec.data.chunk_was_revoked = 0;
657 net->marked_retrans++;
658 stcb->asoc.marked_retrans++;
659 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
660 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_RSND_TO,
661 chk->whoTo->flight_size,
663 (uintptr_t) chk->whoTo,
664 chk->rec.data.TSN_seq);
666 sctp_flight_size_decrease(chk);
667 sctp_total_flight_decrease(stcb, chk);
668 stcb->asoc.peers_rwnd += chk->send_size;
669 stcb->asoc.peers_rwnd += SCTP_BASE_SYSCTL(sctp_peer_chunk_oh);
671 chk->sent = SCTP_DATAGRAM_RESEND;
672 SCTP_STAT_INCR(sctps_markedretrans);
674 /* reset the TSN for striking and other FR stuff */
675 chk->rec.data.doing_fast_retransmit = 0;
676 /* Clear any time so NO RTT is being done */
679 if (chk->whoTo->rto_needed == 0) {
680 chk->whoTo->rto_needed = 1;
685 sctp_free_remote_addr(chk->whoTo);
686 chk->no_fr_allowed = 1;
688 atomic_add_int(&alt->ref_count, 1);
690 chk->no_fr_allowed = 0;
691 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
692 chk->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
694 chk->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
698 * CMT: Do not allow FRs on retransmitted TSNs.
700 if (stcb->asoc.sctp_cmt_on_off > 0) {
701 chk->no_fr_allowed = 1;
703 #ifdef THIS_SHOULD_NOT_BE_DONE
704 } else if (chk->sent == SCTP_DATAGRAM_ACKED) {
705 /* remember highest acked one */
709 if (chk->sent == SCTP_DATAGRAM_RESEND) {
713 if ((orig_flight - net->flight_size) != (orig_tf - stcb->asoc.total_flight)) {
714 /* we did not subtract the same things? */
717 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
718 sctp_log_fr(tsnfirst, tsnlast, num_mk, SCTP_FR_T3_TIMEOUT);
722 SCTPDBG(SCTP_DEBUG_TIMER1, "LAST TSN marked was %x\n",
724 SCTPDBG(SCTP_DEBUG_TIMER1, "Num marked for retransmission was %d peer-rwd:%ld\n",
725 num_mk, (u_long)stcb->asoc.peers_rwnd);
726 SCTPDBG(SCTP_DEBUG_TIMER1, "LAST TSN marked was %x\n",
728 SCTPDBG(SCTP_DEBUG_TIMER1, "Num marked for retransmission was %d peer-rwd:%d\n",
730 (int)stcb->asoc.peers_rwnd);
733 *num_marked = num_mk;
734 *num_abandoned = cnt_abandoned;
736 * Now check for a ECN Echo that may be stranded And include the
737 * cnt_mk'd to have all resends in the control queue.
739 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
740 if (chk->sent == SCTP_DATAGRAM_RESEND) {
743 if ((chk->whoTo == net) &&
744 (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
745 sctp_free_remote_addr(chk->whoTo);
747 if (chk->sent != SCTP_DATAGRAM_RESEND) {
748 chk->sent = SCTP_DATAGRAM_RESEND;
749 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
752 atomic_add_int(&alt->ref_count, 1);
755 #ifdef THIS_SHOULD_NOT_BE_DONE
756 if ((stcb->asoc.sent_queue_retran_cnt == 0) && (could_be_sent)) {
757 /* fix it so we retransmit the highest acked anyway */
758 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
760 could_be_sent->sent = SCTP_DATAGRAM_RESEND;
763 if (stcb->asoc.sent_queue_retran_cnt != cnt_mk) {
765 SCTP_PRINTF("Local Audit says there are %d for retran asoc cnt:%d we marked:%d this time\n",
766 cnt_mk, stcb->asoc.sent_queue_retran_cnt, num_mk);
768 #ifndef SCTP_AUDITING_ENABLED
769 stcb->asoc.sent_queue_retran_cnt = cnt_mk;
773 SCTPDBG(SCTP_DEBUG_TIMER4,
774 "Audit total flight due to negative value net:%p\n",
776 stcb->asoc.total_flight = 0;
777 stcb->asoc.total_flight_count = 0;
778 /* Clear all networks flight size */
779 TAILQ_FOREACH(lnets, &stcb->asoc.nets, sctp_next) {
780 lnets->flight_size = 0;
781 SCTPDBG(SCTP_DEBUG_TIMER4,
782 "Net:%p c-f cwnd:%d ssthresh:%d\n",
783 (void *)lnets, lnets->cwnd, lnets->ssthresh);
785 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
786 if (chk->sent < SCTP_DATAGRAM_RESEND) {
787 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
788 sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
789 chk->whoTo->flight_size,
791 (uintptr_t) chk->whoTo,
792 chk->rec.data.TSN_seq);
794 sctp_flight_size_increase(chk);
795 sctp_total_flight_increase(stcb, chk);
799 /* We return 1 if we only have a window probe outstanding */
805 sctp_t3rxt_timer(struct sctp_inpcb *inp,
806 struct sctp_tcb *stcb,
807 struct sctp_nets *net)
809 struct sctp_nets *alt;
810 int win_probe, num_mk, num_abandoned;
812 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
813 sctp_log_fr(0, 0, 0, SCTP_FR_T3_TIMEOUT);
815 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
816 struct sctp_nets *lnet;
818 TAILQ_FOREACH(lnet, &stcb->asoc.nets, sctp_next) {
820 sctp_log_cwnd(stcb, lnet, 1, SCTP_CWND_LOG_FROM_T3);
822 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_LOG_FROM_T3);
826 /* Find an alternate and mark those for retransmission */
827 if ((stcb->asoc.peers_rwnd == 0) &&
828 (stcb->asoc.total_flight < net->mtu)) {
829 SCTP_STAT_INCR(sctps_timowindowprobe);
835 if (win_probe == 0) {
836 /* We don't do normal threshold management on window probes */
837 if (sctp_threshold_management(inp, stcb, net,
838 stcb->asoc.max_send_times)) {
839 /* Association was destroyed */
842 if (net != stcb->asoc.primary_destination) {
843 /* send a immediate HB if our RTO is stale */
845 unsigned int ms_goneby;
847 (void)SCTP_GETTIME_TIMEVAL(&now);
848 if (net->last_sent_time.tv_sec) {
849 ms_goneby = (now.tv_sec - net->last_sent_time.tv_sec) * 1000;
853 if ((net->dest_state & SCTP_ADDR_PF) == 0) {
854 if ((ms_goneby > net->RTO) || (net->RTO == 0)) {
856 * no recent feed back in an
857 * RTO or more, request a
860 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
867 * For a window probe we don't penalize the net's but only
868 * the association. This may fail it if SACKs are not coming
869 * back. If sack's are coming with rwnd locked at 0, we will
870 * continue to hold things waiting for rwnd to raise
872 if (sctp_threshold_management(inp, stcb, NULL,
873 stcb->asoc.max_send_times)) {
874 /* Association was destroyed */
878 if (stcb->asoc.sctp_cmt_on_off > 0) {
879 if (net->pf_threshold < net->failure_threshold) {
880 alt = sctp_find_alternate_net(stcb, net, 2);
883 * CMT: Using RTX_SSTHRESH policy for CMT. If CMT is
884 * being used, then pick dest with largest ssthresh
885 * for any retransmission.
887 alt = sctp_find_alternate_net(stcb, net, 1);
889 * CUCv2: If a different dest is picked for the
890 * retransmission, then new (rtx-)pseudo_cumack
891 * needs to be tracked for orig dest. Let CUCv2
892 * track new (rtx-) pseudo-cumack always.
894 net->find_pseudo_cumack = 1;
895 net->find_rtx_pseudo_cumack = 1;
898 alt = sctp_find_alternate_net(stcb, net, 0);
903 (void)sctp_mark_all_for_resend(stcb, net, alt, win_probe,
904 &num_mk, &num_abandoned);
905 /* FR Loss recovery just ended with the T3. */
906 stcb->asoc.fast_retran_loss_recovery = 0;
908 /* CMT FR loss recovery ended with the T3 */
909 net->fast_retran_loss_recovery = 0;
910 if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
911 (net->flight_size == 0)) {
912 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
915 * setup the sat loss recovery that prevents satellite cwnd advance.
917 stcb->asoc.sat_t3_loss_recovery = 1;
918 stcb->asoc.sat_t3_recovery_tsn = stcb->asoc.sending_seq;
920 /* Backoff the timer and cwnd */
921 sctp_backoff_on_timeout(stcb, net, win_probe, num_mk, num_abandoned);
922 if ((!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
923 (net->dest_state & SCTP_ADDR_PF)) {
924 /* Move all pending over too */
925 sctp_move_chunks_from_net(stcb, net);
928 * Get the address that failed, to force a new src address
929 * selecton and a route allocation.
931 if (net->ro._s_addr) {
932 sctp_free_ifa(net->ro._s_addr);
933 net->ro._s_addr = NULL;
935 net->src_addr_selected = 0;
937 /* Force a route allocation too */
939 RTFREE(net->ro.ro_rt);
940 net->ro.ro_rt = NULL;
942 /* Was it our primary? */
943 if ((stcb->asoc.primary_destination == net) && (alt != net)) {
945 * Yes, note it as such and find an alternate note:
946 * this means HB code must use this to resent the
947 * primary if it goes active AND if someone does a
948 * change-primary then this flag must be cleared
949 * from any net structures.
951 if (stcb->asoc.alternate) {
952 sctp_free_remote_addr(stcb->asoc.alternate);
954 stcb->asoc.alternate = alt;
955 atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
959 * Special case for cookie-echo'ed case, we don't do output but must
960 * await the COOKIE-ACK before retransmission
962 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
964 * Here we just reset the timer and start again since we
965 * have not established the asoc
967 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
970 if (stcb->asoc.peer_supports_prsctp) {
971 struct sctp_tmit_chunk *lchk;
973 lchk = sctp_try_advance_peer_ack_point(stcb, &stcb->asoc);
974 /* C3. See if we need to send a Fwd-TSN */
975 if (SCTP_TSN_GT(stcb->asoc.advanced_peer_ack_point, stcb->asoc.last_acked_seq)) {
976 send_forward_tsn(stcb, &stcb->asoc);
978 /* Assure a timer is up */
979 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, lchk->whoTo);
983 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
984 sctp_log_cwnd(stcb, net, net->cwnd, SCTP_CWND_LOG_FROM_RTX);
990 sctp_t1init_timer(struct sctp_inpcb *inp,
991 struct sctp_tcb *stcb,
992 struct sctp_nets *net)
994 /* bump the thresholds */
995 if (stcb->asoc.delayed_connection) {
997 * special hook for delayed connection. The library did NOT
998 * complete the rest of its sends.
1000 stcb->asoc.delayed_connection = 0;
1001 sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
1004 if (SCTP_GET_STATE((&stcb->asoc)) != SCTP_STATE_COOKIE_WAIT) {
1007 if (sctp_threshold_management(inp, stcb, net,
1008 stcb->asoc.max_init_times)) {
1009 /* Association was destroyed */
1012 stcb->asoc.dropped_special_cnt = 0;
1013 sctp_backoff_on_timeout(stcb, stcb->asoc.primary_destination, 1, 0, 0);
1014 if (stcb->asoc.initial_init_rto_max < net->RTO) {
1015 net->RTO = stcb->asoc.initial_init_rto_max;
1017 if (stcb->asoc.numnets > 1) {
1018 /* If we have more than one addr use it */
1019 struct sctp_nets *alt;
1021 alt = sctp_find_alternate_net(stcb, stcb->asoc.primary_destination, 0);
1022 if (alt != stcb->asoc.primary_destination) {
1023 sctp_move_chunks_from_net(stcb, stcb->asoc.primary_destination);
1024 stcb->asoc.primary_destination = alt;
1027 /* Send out a new init */
1028 sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
1033 * For cookie and asconf we actually need to find and mark for resend, then
1034 * increment the resend counter (after all the threshold management stuff of
1038 sctp_cookie_timer(struct sctp_inpcb *inp,
1039 struct sctp_tcb *stcb,
1040 struct sctp_nets *net SCTP_UNUSED)
1042 struct sctp_nets *alt;
1043 struct sctp_tmit_chunk *cookie;
1045 /* first before all else we must find the cookie */
1046 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, sctp_next) {
1047 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
1051 if (cookie == NULL) {
1052 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
1056 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)),
1057 0, M_NOWAIT, 1, MT_DATA);
1059 struct sctp_paramhdr *ph;
1062 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
1064 ph = mtod(oper, struct sctp_paramhdr *);
1065 ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
1066 ph->param_length = htons(SCTP_BUF_LEN(oper));
1067 ippp = (uint32_t *) (ph + 1);
1068 *ippp = htonl(SCTP_FROM_SCTP_TIMER + SCTP_LOC_3);
1070 inp->last_abort_code = SCTP_FROM_SCTP_TIMER + SCTP_LOC_4;
1071 sctp_abort_an_association(inp, stcb, oper, SCTP_SO_NOT_LOCKED);
1074 panic("Cookie timer expires in wrong state?");
1076 SCTP_PRINTF("Strange in state %d not cookie-echoed yet c-e timer expires?\n", SCTP_GET_STATE(&stcb->asoc));
1082 /* Ok we found the cookie, threshold management next */
1083 if (sctp_threshold_management(inp, stcb, cookie->whoTo,
1084 stcb->asoc.max_init_times)) {
1089 * cleared theshold management now lets backoff the address & select
1092 stcb->asoc.dropped_special_cnt = 0;
1093 sctp_backoff_on_timeout(stcb, cookie->whoTo, 1, 0, 0);
1094 alt = sctp_find_alternate_net(stcb, cookie->whoTo, 0);
1095 if (alt != cookie->whoTo) {
1096 sctp_free_remote_addr(cookie->whoTo);
1097 cookie->whoTo = alt;
1098 atomic_add_int(&alt->ref_count, 1);
1100 /* Now mark the retran info */
1101 if (cookie->sent != SCTP_DATAGRAM_RESEND) {
1102 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1104 cookie->sent = SCTP_DATAGRAM_RESEND;
1106 * Now call the output routine to kick out the cookie again, Note we
1107 * don't mark any chunks for retran so that FR will need to kick in
1108 * to move these (or a send timer).
1114 sctp_strreset_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1115 struct sctp_nets *net)
1117 struct sctp_nets *alt;
1118 struct sctp_tmit_chunk *strrst = NULL, *chk = NULL;
1120 if (stcb->asoc.stream_reset_outstanding == 0) {
1123 /* find the existing STRRESET, we use the seq number we sent out on */
1124 (void)sctp_find_stream_reset(stcb, stcb->asoc.str_reset_seq_out, &strrst);
1125 if (strrst == NULL) {
1128 /* do threshold management */
1129 if (sctp_threshold_management(inp, stcb, strrst->whoTo,
1130 stcb->asoc.max_send_times)) {
1135 * cleared theshold management now lets backoff the address & select
1138 sctp_backoff_on_timeout(stcb, strrst->whoTo, 1, 0, 0);
1139 alt = sctp_find_alternate_net(stcb, strrst->whoTo, 0);
1140 sctp_free_remote_addr(strrst->whoTo);
1141 strrst->whoTo = alt;
1142 atomic_add_int(&alt->ref_count, 1);
1144 /* See if a ECN Echo is also stranded */
1145 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
1146 if ((chk->whoTo == net) &&
1147 (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
1148 sctp_free_remote_addr(chk->whoTo);
1149 if (chk->sent != SCTP_DATAGRAM_RESEND) {
1150 chk->sent = SCTP_DATAGRAM_RESEND;
1151 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1154 atomic_add_int(&alt->ref_count, 1);
1157 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
1159 * If the address went un-reachable, we need to move to
1160 * alternates for ALL chk's in queue
1162 sctp_move_chunks_from_net(stcb, net);
1164 /* mark the retran info */
1165 if (strrst->sent != SCTP_DATAGRAM_RESEND)
1166 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1167 strrst->sent = SCTP_DATAGRAM_RESEND;
1169 /* restart the timer */
1170 sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, inp, stcb, strrst->whoTo);
1175 sctp_asconf_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1176 struct sctp_nets *net)
1178 struct sctp_nets *alt;
1179 struct sctp_tmit_chunk *asconf, *chk;
1181 /* is this a first send, or a retransmission? */
1182 if (TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) {
1183 /* compose a new ASCONF chunk and send it */
1184 sctp_send_asconf(stcb, net, SCTP_ADDR_NOT_LOCKED);
1187 * Retransmission of the existing ASCONF is needed
1190 /* find the existing ASCONF */
1191 asconf = TAILQ_FIRST(&stcb->asoc.asconf_send_queue);
1192 if (asconf == NULL) {
1195 /* do threshold management */
1196 if (sctp_threshold_management(inp, stcb, asconf->whoTo,
1197 stcb->asoc.max_send_times)) {
1201 if (asconf->snd_count > stcb->asoc.max_send_times) {
1203 * Something is rotten: our peer is not responding
1204 * to ASCONFs but apparently is to other chunks.
1205 * i.e. it is not properly handling the chunk type
1206 * upper bits. Mark this peer as ASCONF incapable
1209 SCTPDBG(SCTP_DEBUG_TIMER1, "asconf_timer: Peer has not responded to our repeated ASCONFs\n");
1210 sctp_asconf_cleanup(stcb, net);
1214 * cleared threshold management, so now backoff the net and
1215 * select an alternate
1217 sctp_backoff_on_timeout(stcb, asconf->whoTo, 1, 0, 0);
1218 alt = sctp_find_alternate_net(stcb, asconf->whoTo, 0);
1219 if (asconf->whoTo != alt) {
1220 sctp_free_remote_addr(asconf->whoTo);
1221 asconf->whoTo = alt;
1222 atomic_add_int(&alt->ref_count, 1);
1224 /* See if an ECN Echo is also stranded */
1225 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
1226 if ((chk->whoTo == net) &&
1227 (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
1228 sctp_free_remote_addr(chk->whoTo);
1230 if (chk->sent != SCTP_DATAGRAM_RESEND) {
1231 chk->sent = SCTP_DATAGRAM_RESEND;
1232 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1234 atomic_add_int(&alt->ref_count, 1);
1237 TAILQ_FOREACH(chk, &stcb->asoc.asconf_send_queue, sctp_next) {
1238 if (chk->whoTo != alt) {
1239 sctp_free_remote_addr(chk->whoTo);
1241 atomic_add_int(&alt->ref_count, 1);
1243 if (asconf->sent != SCTP_DATAGRAM_RESEND && chk->sent != SCTP_DATAGRAM_UNSENT)
1244 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1245 chk->sent = SCTP_DATAGRAM_RESEND;
1247 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
1249 * If the address went un-reachable, we need to move
1250 * to the alternate for ALL chunks in queue
1252 sctp_move_chunks_from_net(stcb, net);
1254 /* mark the retran info */
1255 if (asconf->sent != SCTP_DATAGRAM_RESEND)
1256 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1257 asconf->sent = SCTP_DATAGRAM_RESEND;
1259 /* send another ASCONF if any and we can do */
1260 sctp_send_asconf(stcb, alt, SCTP_ADDR_NOT_LOCKED);
1265 /* Mobility adaptation */
1267 sctp_delete_prim_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1268 struct sctp_nets *net SCTP_UNUSED)
1270 if (stcb->asoc.deleted_primary == NULL) {
1271 SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: deleted_primary is not stored...\n");
1272 sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
1275 SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: finished to keep deleted primary ");
1276 SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, &stcb->asoc.deleted_primary->ro._l_addr.sa);
1277 sctp_free_remote_addr(stcb->asoc.deleted_primary);
1278 stcb->asoc.deleted_primary = NULL;
1279 sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
1284 * For the shutdown and shutdown-ack, we do not keep one around on the
1285 * control queue. This means we must generate a new one and call the general
1286 * chunk output routine, AFTER having done threshold management.
1287 * It is assumed that net is non-NULL.
1290 sctp_shutdown_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1291 struct sctp_nets *net)
1293 struct sctp_nets *alt;
1295 /* first threshold managment */
1296 if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
1300 sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
1301 /* second select an alternative */
1302 alt = sctp_find_alternate_net(stcb, net, 0);
1304 /* third generate a shutdown into the queue for out net */
1305 sctp_send_shutdown(stcb, alt);
1307 /* fourth restart timer */
1308 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, inp, stcb, alt);
1313 sctp_shutdownack_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1314 struct sctp_nets *net)
1316 struct sctp_nets *alt;
1318 /* first threshold managment */
1319 if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
1323 sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
1324 /* second select an alternative */
1325 alt = sctp_find_alternate_net(stcb, net, 0);
1327 /* third generate a shutdown into the queue for out net */
1328 sctp_send_shutdown_ack(stcb, alt);
1330 /* fourth restart timer */
1331 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, inp, stcb, alt);
1336 sctp_audit_stream_queues_for_size(struct sctp_inpcb *inp,
1337 struct sctp_tcb *stcb)
1339 struct sctp_stream_queue_pending *sp;
1340 unsigned int i, chks_in_queue = 0;
1341 int being_filled = 0;
1344 * This function is ONLY called when the send/sent queues are empty.
1346 if ((stcb == NULL) || (inp == NULL))
1349 if (stcb->asoc.sent_queue_retran_cnt) {
1350 SCTP_PRINTF("Hmm, sent_queue_retran_cnt is non-zero %d\n",
1351 stcb->asoc.sent_queue_retran_cnt);
1352 stcb->asoc.sent_queue_retran_cnt = 0;
1354 if (stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
1355 /* No stream scheduler information, initialize scheduler */
1356 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 0);
1357 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
1358 /* yep, we lost a stream or two */
1359 SCTP_PRINTF("Found additional streams NOT managed by scheduler, corrected\n");
1361 /* no streams lost */
1362 stcb->asoc.total_output_queue_size = 0;
1365 /* Check to see if some data queued, if so report it */
1366 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1367 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
1368 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
1369 if (sp->msg_is_complete)
1375 if (chks_in_queue != stcb->asoc.stream_queue_cnt) {
1376 SCTP_PRINTF("Hmm, stream queue cnt at %d I counted %d in stream out wheel\n",
1377 stcb->asoc.stream_queue_cnt, chks_in_queue);
1379 if (chks_in_queue) {
1380 /* call the output queue function */
1381 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_T3, SCTP_SO_NOT_LOCKED);
1382 if ((TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
1383 (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
1385 * Probably should go in and make it go back through
1386 * and add fragments allowed
1388 if (being_filled == 0) {
1389 SCTP_PRINTF("Still nothing moved %d chunks are stuck\n",
1394 SCTP_PRINTF("Found no chunks on any queue tot:%lu\n",
1395 (u_long)stcb->asoc.total_output_queue_size);
1396 stcb->asoc.total_output_queue_size = 0;
1401 sctp_heartbeat_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1402 struct sctp_nets *net)
1406 if (net->dest_state & SCTP_ADDR_PF) {
1411 if (net->hb_responded == 0) {
1412 if (net->ro._s_addr) {
1414 * Invalidate the src address if we did not get a
1415 * response last time.
1417 sctp_free_ifa(net->ro._s_addr);
1418 net->ro._s_addr = NULL;
1419 net->src_addr_selected = 0;
1421 sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
1422 if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
1427 /* Zero PBA, if it needs it */
1428 if (net->partial_bytes_acked) {
1429 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 uint32_t ms_gone_by;
1444 if ((net->last_sent_time.tv_sec > 0) ||
1445 (net->last_sent_time.tv_usec > 0)) {
1446 struct timeval diff;
1448 SCTP_GETTIME_TIMEVAL(&diff);
1449 timevalsub(&diff, &net->last_sent_time);
1450 ms_gone_by = (uint32_t) (diff.tv_sec * 1000) +
1451 (uint32_t) (diff.tv_usec / 1000);
1453 ms_gone_by = 0xffffffff;
1455 if ((ms_gone_by >= net->heart_beat_delay) ||
1456 (net->dest_state & SCTP_ADDR_PF)) {
1457 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
1464 sctp_pathmtu_timer(struct sctp_inpcb *inp,
1465 struct sctp_tcb *stcb,
1466 struct sctp_nets *net)
1468 uint32_t next_mtu, mtu;
1470 next_mtu = sctp_get_next_mtu(net->mtu);
1472 if ((next_mtu > net->mtu) && (net->port == 0)) {
1473 if ((net->src_addr_selected == 0) ||
1474 (net->ro._s_addr == NULL) ||
1475 (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
1476 if ((net->ro._s_addr != NULL) && (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
1477 sctp_free_ifa(net->ro._s_addr);
1478 net->ro._s_addr = NULL;
1479 net->src_addr_selected = 0;
1480 } else if (net->ro._s_addr == NULL) {
1481 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
1482 if (net->ro._l_addr.sa.sa_family == AF_INET6) {
1483 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1485 /* KAME hack: embed scopeid */
1486 (void)sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
1490 net->ro._s_addr = sctp_source_address_selection(inp,
1492 (sctp_route_t *) & net->ro,
1493 net, 0, stcb->asoc.vrf_id);
1494 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
1495 if (net->ro._l_addr.sa.sa_family == AF_INET6) {
1496 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1498 (void)sa6_recoverscope(sin6);
1502 if (net->ro._s_addr)
1503 net->src_addr_selected = 1;
1505 if (net->ro._s_addr) {
1506 mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._s_addr.sa, net->ro.ro_rt);
1508 mtu -= sizeof(struct udphdr);
1510 if (mtu > next_mtu) {
1511 net->mtu = next_mtu;
1515 /* restart the timer */
1516 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net);
1520 sctp_autoclose_timer(struct sctp_inpcb *inp,
1521 struct sctp_tcb *stcb,
1522 struct sctp_nets *net)
1524 struct timeval tn, *tim_touse;
1525 struct sctp_association *asoc;
1528 (void)SCTP_GETTIME_TIMEVAL(&tn);
1529 if (stcb->asoc.sctp_autoclose_ticks &&
1530 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1531 /* Auto close is on */
1533 /* pick the time to use */
1534 if (asoc->time_last_rcvd.tv_sec >
1535 asoc->time_last_sent.tv_sec) {
1536 tim_touse = &asoc->time_last_rcvd;
1538 tim_touse = &asoc->time_last_sent;
1540 /* Now has long enough transpired to autoclose? */
1541 ticks_gone_by = SEC_TO_TICKS(tn.tv_sec - tim_touse->tv_sec);
1542 if ((ticks_gone_by > 0) &&
1543 (ticks_gone_by >= (int)asoc->sctp_autoclose_ticks)) {
1545 * autoclose time has hit, call the output routine,
1546 * which should do nothing just to be SURE we don't
1547 * have hanging data. We can then safely check the
1548 * queues and know that we are clear to send
1551 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_AUTOCLOSE_TMR, SCTP_SO_NOT_LOCKED);
1553 if (TAILQ_EMPTY(&asoc->send_queue) &&
1554 TAILQ_EMPTY(&asoc->sent_queue)) {
1556 * there is nothing queued to send, so I'm
1559 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
1560 /* only send SHUTDOWN 1st time thru */
1561 struct sctp_nets *netp;
1563 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
1564 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
1565 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
1567 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
1568 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
1569 sctp_stop_timers_for_shutdown(stcb);
1570 if (stcb->asoc.alternate) {
1571 netp = stcb->asoc.alternate;
1573 netp = stcb->asoc.primary_destination;
1575 sctp_send_shutdown(stcb, netp);
1576 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
1577 stcb->sctp_ep, stcb,
1579 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1580 stcb->sctp_ep, stcb,
1586 * No auto close at this time, reset t-o to check
1591 /* fool the timer startup to use the time left */
1592 tmp = asoc->sctp_autoclose_ticks;
1593 asoc->sctp_autoclose_ticks -= ticks_gone_by;
1594 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1596 /* restore the real tick value */
1597 asoc->sctp_autoclose_ticks = tmp;