1 /*-
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.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
8 *
9 * a) Redistributions of source code must retain the above copyright notice,
10 * this list of conditions and the following disclaimer.
11 *
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.
15 *
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.
19 *
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.
31 */
32
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD: releng/10.2/sys/netinet/sctp_timer.c 283822 2015-05-31 12:46:40Z tuexen $");
35
36 #define _IP_VHL
37 #include <netinet/sctp_os.h>
38 #include <netinet/sctp_pcb.h>
39 #ifdef INET6
40 #endif
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 #if defined(INET) || defined(INET6)
53 #include <netinet/udp.h>
54 #endif
55
56
57 void
58 sctp_audit_retranmission_queue(struct sctp_association *asoc)
59 {
60 struct sctp_tmit_chunk *chk;
61
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);
70 }
71 asoc->sent_queue_cnt++;
72 }
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);
76 }
77 }
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);
81 }
82 }
83 SCTPDBG(SCTP_DEBUG_TIMER4, "Audit completes retran:%d onqueue:%d\n",
84 asoc->sent_queue_retran_cnt,
85 asoc->sent_queue_cnt);
86 }
87
88 int
89 sctp_threshold_management(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
90 struct sctp_nets *net, uint16_t threshold)
91 {
92 if (net) {
93 net->error_count++;
94 SCTPDBG(SCTP_DEBUG_TIMER4, "Error count for %p now %d thresh:%d\n",
95 (void *)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,
104 stcb, 0,
105 (void *)net, SCTP_SO_NOT_LOCKED);
106 }
107 } else if ((net->pf_threshold < net->failure_threshold) &&
108 (net->error_count > net->pf_threshold)) {
109 if (!(net->dest_state & SCTP_ADDR_PF)) {
110 net->dest_state |= SCTP_ADDR_PF;
111 net->last_active = sctp_get_tick_count();
112 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
113 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT,
114 stcb->sctp_ep, stcb, net,
115 SCTP_FROM_SCTP_TIMER + SCTP_LOC_1);
116 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
117 }
118 }
119 }
120 if (stcb == NULL)
121 return (0);
122
123 if (net) {
124 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0) {
125 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
126 sctp_misc_ints(SCTP_THRESHOLD_INCR,
127 stcb->asoc.overall_error_count,
128 (stcb->asoc.overall_error_count + 1),
129 SCTP_FROM_SCTP_TIMER,
130 __LINE__);
131 }
132 stcb->asoc.overall_error_count++;
133 }
134 } else {
135 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
136 sctp_misc_ints(SCTP_THRESHOLD_INCR,
137 stcb->asoc.overall_error_count,
138 (stcb->asoc.overall_error_count + 1),
139 SCTP_FROM_SCTP_TIMER,
140 __LINE__);
141 }
142 stcb->asoc.overall_error_count++;
143 }
144 SCTPDBG(SCTP_DEBUG_TIMER4, "Overall error count for %p now %d thresh:%u state:%x\n",
145 (void *)&stcb->asoc, stcb->asoc.overall_error_count,
146 (uint32_t) threshold,
147 ((net == NULL) ? (uint32_t) 0 : (uint32_t) net->dest_state));
148 /*
149 * We specifically do not do >= to give the assoc one more change
150 * before we fail it.
151 */
152 if (stcb->asoc.overall_error_count > threshold) {
153 /* Abort notification sends a ULP notify */
154 struct mbuf *op_err;
155
156 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION,
157 "Association error counter exceeded");
158 inp->last_abort_code = SCTP_FROM_SCTP_TIMER + SCTP_LOC_2;
159 sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED);
160 return (1);
161 }
162 return (0);
163 }
164
165 /*
166 * sctp_find_alternate_net() returns a non-NULL pointer as long
167 * the argument net is non-NULL.
168 */
169 struct sctp_nets *
170 sctp_find_alternate_net(struct sctp_tcb *stcb,
171 struct sctp_nets *net,
172 int mode)
173 {
174 /* Find and return an alternate network if possible */
175 struct sctp_nets *alt, *mnet, *min_errors_net = NULL, *max_cwnd_net = NULL;
176 int once;
177
178 /* JRS 5/14/07 - Initialize min_errors to an impossible value. */
179 int min_errors = -1;
180 uint32_t max_cwnd = 0;
181
182 if (stcb->asoc.numnets == 1) {
183 /* No others but net */
184 return (TAILQ_FIRST(&stcb->asoc.nets));
185 }
186 /*
187 * JRS 5/14/07 - If mode is set to 2, use the CMT PF find alternate
188 * net algorithm. This algorithm chooses the active destination (not
189 * in PF state) with the largest cwnd value. If all destinations are
190 * in PF state, unreachable, or unconfirmed, choose the desination
191 * that is in PF state with the lowest error count. In case of a
192 * tie, choose the destination that was most recently active.
193 */
194 if (mode == 2) {
195 TAILQ_FOREACH(mnet, &stcb->asoc.nets, sctp_next) {
196 /*
197 * JRS 5/14/07 - If the destination is unreachable
198 * or unconfirmed, skip it.
199 */
200 if (((mnet->dest_state & SCTP_ADDR_REACHABLE) != SCTP_ADDR_REACHABLE) ||
201 (mnet->dest_state & SCTP_ADDR_UNCONFIRMED)) {
202 continue;
203 }
204 /*
205 * JRS 5/14/07 - If the destination is reachable
206 * but in PF state, compare the error count of the
207 * destination to the minimum error count seen thus
208 * far. Store the destination with the lower error
209 * count. If the error counts are equal, store the
210 * destination that was most recently active.
211 */
212 if (mnet->dest_state & SCTP_ADDR_PF) {
213 /*
214 * JRS 5/14/07 - If the destination under
215 * consideration is the current destination,
216 * work as if the error count is one higher.
217 * The actual error count will not be
218 * incremented until later in the t3
219 * handler.
220 */
221 if (mnet == net) {
222 if (min_errors == -1) {
223 min_errors = mnet->error_count + 1;
224 min_errors_net = mnet;
225 } else if (mnet->error_count + 1 < min_errors) {
226 min_errors = mnet->error_count + 1;
227 min_errors_net = mnet;
228 } else if (mnet->error_count + 1 == min_errors
229 && mnet->last_active > min_errors_net->last_active) {
230 min_errors_net = mnet;
231 min_errors = mnet->error_count + 1;
232 }
233 continue;
234 } else {
235 if (min_errors == -1) {
236 min_errors = mnet->error_count;
237 min_errors_net = mnet;
238 } else if (mnet->error_count < min_errors) {
239 min_errors = mnet->error_count;
240 min_errors_net = mnet;
241 } else if (mnet->error_count == min_errors
242 && mnet->last_active > min_errors_net->last_active) {
243 min_errors_net = mnet;
244 min_errors = mnet->error_count;
245 }
246 continue;
247 }
248 }
249 /*
250 * JRS 5/14/07 - If the destination is reachable and
251 * not in PF state, compare the cwnd of the
252 * destination to the highest cwnd seen thus far.
253 * Store the destination with the higher cwnd value.
254 * If the cwnd values are equal, randomly choose one
255 * of the two destinations.
256 */
257 if (max_cwnd < mnet->cwnd) {
258 max_cwnd_net = mnet;
259 max_cwnd = mnet->cwnd;
260 } else if (max_cwnd == mnet->cwnd) {
261 uint32_t rndval;
262 uint8_t this_random;
263
264 if (stcb->asoc.hb_random_idx > 3) {
265 rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
266 memcpy(stcb->asoc.hb_random_values, &rndval, sizeof(stcb->asoc.hb_random_values));
267 this_random = stcb->asoc.hb_random_values[0];
268 stcb->asoc.hb_random_idx++;
269 stcb->asoc.hb_ect_randombit = 0;
270 } else {
271 this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
272 stcb->asoc.hb_random_idx++;
273 stcb->asoc.hb_ect_randombit = 0;
274 }
275 if (this_random % 2 == 1) {
276 max_cwnd_net = mnet;
277 max_cwnd = mnet->cwnd; /* Useless? */
278 }
279 }
280 }
281 if (max_cwnd_net == NULL) {
282 if (min_errors_net == NULL) {
283 return (net);
284 }
285 return (min_errors_net);
286 } else {
287 return (max_cwnd_net);
288 }
289 }
290 /*
291 * JRS 5/14/07 - If mode is set to 1, use the CMT policy for
292 * choosing an alternate net.
293 */
294 else if (mode == 1) {
295 TAILQ_FOREACH(mnet, &stcb->asoc.nets, sctp_next) {
296 if (((mnet->dest_state & SCTP_ADDR_REACHABLE) != SCTP_ADDR_REACHABLE) ||
297 (mnet->dest_state & SCTP_ADDR_UNCONFIRMED)) {
298 /*
299 * will skip ones that are not-reachable or
300 * unconfirmed
301 */
302 continue;
303 }
304 if (max_cwnd < mnet->cwnd) {
305 max_cwnd_net = mnet;
306 max_cwnd = mnet->cwnd;
307 } else if (max_cwnd == mnet->cwnd) {
308 uint32_t rndval;
309 uint8_t this_random;
310
311 if (stcb->asoc.hb_random_idx > 3) {
312 rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
313 memcpy(stcb->asoc.hb_random_values, &rndval,
314 sizeof(stcb->asoc.hb_random_values));
315 this_random = stcb->asoc.hb_random_values[0];
316 stcb->asoc.hb_random_idx = 0;
317 stcb->asoc.hb_ect_randombit = 0;
318 } else {
319 this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
320 stcb->asoc.hb_random_idx++;
321 stcb->asoc.hb_ect_randombit = 0;
322 }
323 if (this_random % 2) {
324 max_cwnd_net = mnet;
325 max_cwnd = mnet->cwnd;
326 }
327 }
328 }
329 if (max_cwnd_net) {
330 return (max_cwnd_net);
331 }
332 }
333 mnet = net;
334 once = 0;
335
336 if (mnet == NULL) {
337 mnet = TAILQ_FIRST(&stcb->asoc.nets);
338 if (mnet == NULL) {
339 return (NULL);
340 }
341 }
342 for (;;) {
343 alt = TAILQ_NEXT(mnet, sctp_next);
344 if (alt == NULL) {
345 once++;
346 if (once > 1) {
347 break;
348 }
349 alt = TAILQ_FIRST(&stcb->asoc.nets);
350 if (alt == NULL) {
351 return (NULL);
352 }
353 }
354 if (alt->ro.ro_rt == NULL) {
355 if (alt->ro._s_addr) {
356 sctp_free_ifa(alt->ro._s_addr);
357 alt->ro._s_addr = NULL;
358 }
359 alt->src_addr_selected = 0;
360 }
361 if (((alt->dest_state & SCTP_ADDR_REACHABLE) == SCTP_ADDR_REACHABLE) &&
362 (alt->ro.ro_rt != NULL) &&
363 (!(alt->dest_state & SCTP_ADDR_UNCONFIRMED))) {
364 /* Found a reachable address */
365 break;
366 }
367 mnet = alt;
368 }
369
370 if (alt == NULL) {
371 /* Case where NO insv network exists (dormant state) */
372 /* we rotate destinations */
373 once = 0;
374 mnet = net;
375 for (;;) {
376 if (mnet == NULL) {
377 return (TAILQ_FIRST(&stcb->asoc.nets));
378 }
379 alt = TAILQ_NEXT(mnet, sctp_next);
380 if (alt == NULL) {
381 once++;
382 if (once > 1) {
383 break;
384 }
385 alt = TAILQ_FIRST(&stcb->asoc.nets);
386 if (alt == NULL) {
387 break;
388 }
389 }
390 if ((!(alt->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
391 (alt != net)) {
392 /* Found an alternate address */
393 break;
394 }
395 mnet = alt;
396 }
397 }
398 if (alt == NULL) {
399 return (net);
400 }
401 return (alt);
402 }
403
404 static void
405 sctp_backoff_on_timeout(struct sctp_tcb *stcb,
406 struct sctp_nets *net,
407 int win_probe,
408 int num_marked, int num_abandoned)
409 {
410 if (net->RTO == 0) {
411 net->RTO = stcb->asoc.minrto;
412 }
413 net->RTO <<= 1;
414 if (net->RTO > stcb->asoc.maxrto) {
415 net->RTO = stcb->asoc.maxrto;
416 }
417 if ((win_probe == 0) && (num_marked || num_abandoned)) {
418 /* We don't apply penalty to window probe scenarios */
419 /* JRS - Use the congestion control given in the CC module */
420 stcb->asoc.cc_functions.sctp_cwnd_update_after_timeout(stcb, net);
421 }
422 }
423
424 #ifndef INVARIANTS
425 static void
426 sctp_recover_sent_list(struct sctp_tcb *stcb)
427 {
428 struct sctp_tmit_chunk *chk, *nchk;
429 struct sctp_association *asoc;
430
431 asoc = &stcb->asoc;
432 TAILQ_FOREACH_SAFE(chk, &asoc->sent_queue, sctp_next, nchk) {
433 if (SCTP_TSN_GE(asoc->last_acked_seq, chk->rec.data.TSN_seq)) {
434 SCTP_PRINTF("Found chk:%p tsn:%x <= last_acked_seq:%x\n",
435 (void *)chk, chk->rec.data.TSN_seq, asoc->last_acked_seq);
436 if (chk->sent != SCTP_DATAGRAM_NR_ACKED) {
437 if (asoc->strmout[chk->rec.data.stream_number].chunks_on_queues > 0) {
438 asoc->strmout[chk->rec.data.stream_number].chunks_on_queues--;
439 }
440 }
441 TAILQ_REMOVE(&asoc->sent_queue, chk, sctp_next);
442 if (PR_SCTP_ENABLED(chk->flags)) {
443 if (asoc->pr_sctp_cnt != 0)
444 asoc->pr_sctp_cnt--;
445 }
446 if (chk->data) {
447 /* sa_ignore NO_NULL_CHK */
448 sctp_free_bufspace(stcb, asoc, chk, 1);
449 sctp_m_freem(chk->data);
450 chk->data = NULL;
451 if (asoc->prsctp_supported && PR_SCTP_BUF_ENABLED(chk->flags)) {
452 asoc->sent_queue_cnt_removeable--;
453 }
454 }
455 asoc->sent_queue_cnt--;
456 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
457 }
458 }
459 SCTP_PRINTF("after recover order is as follows\n");
460 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
461 SCTP_PRINTF("chk:%p TSN:%x\n", (void *)chk, chk->rec.data.TSN_seq);
462 }
463 }
464
465 #endif
466
467 static int
468 sctp_mark_all_for_resend(struct sctp_tcb *stcb,
469 struct sctp_nets *net,
470 struct sctp_nets *alt,
471 int window_probe,
472 int *num_marked,
473 int *num_abandoned)
474 {
475
476 /*
477 * Mark all chunks (well not all) that were sent to *net for
478 * retransmission. Move them to alt for there destination as well...
479 * We only mark chunks that have been outstanding long enough to
480 * have received feed-back.
481 */
482 struct sctp_tmit_chunk *chk, *nchk;
483 struct sctp_nets *lnets;
484 struct timeval now, min_wait, tv;
485 int cur_rto;
486 int cnt_abandoned;
487 int audit_tf, num_mk, fir;
488 unsigned int cnt_mk;
489 uint32_t orig_flight, orig_tf;
490 uint32_t tsnlast, tsnfirst;
491 int recovery_cnt = 0;
492
493
494 /* none in flight now */
495 audit_tf = 0;
496 fir = 0;
497 /*
498 * figure out how long a data chunk must be pending before we can
499 * mark it ..
500 */
501 (void)SCTP_GETTIME_TIMEVAL(&now);
502 /* get cur rto in micro-seconds */
503 cur_rto = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv;
504 cur_rto *= 1000;
505 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
506 sctp_log_fr(cur_rto,
507 stcb->asoc.peers_rwnd,
508 window_probe,
509 SCTP_FR_T3_MARK_TIME);
510 sctp_log_fr(net->flight_size, 0, 0, SCTP_FR_CWND_REPORT);
511 sctp_log_fr(net->flight_size, net->cwnd, stcb->asoc.total_flight, SCTP_FR_CWND_REPORT);
512 }
513 tv.tv_sec = cur_rto / 1000000;
514 tv.tv_usec = cur_rto % 1000000;
515 min_wait = now;
516 timevalsub(&min_wait, &tv);
517 if (min_wait.tv_sec < 0 || min_wait.tv_usec < 0) {
518 /*
519 * if we hit here, we don't have enough seconds on the clock
520 * to account for the RTO. We just let the lower seconds be
521 * the bounds and don't worry about it. This may mean we
522 * will mark a lot more than we should.
523 */
524 min_wait.tv_sec = min_wait.tv_usec = 0;
525 }
526 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
527 sctp_log_fr(cur_rto, now.tv_sec, now.tv_usec, SCTP_FR_T3_MARK_TIME);
528 sctp_log_fr(0, min_wait.tv_sec, min_wait.tv_usec, SCTP_FR_T3_MARK_TIME);
529 }
530 /*
531 * Our rwnd will be incorrect here since we are not adding back the
532 * cnt * mbuf but we will fix that down below.
533 */
534 orig_flight = net->flight_size;
535 orig_tf = stcb->asoc.total_flight;
536
537 net->fast_retran_ip = 0;
538 /* Now on to each chunk */
539 cnt_abandoned = 0;
540 num_mk = cnt_mk = 0;
541 tsnfirst = tsnlast = 0;
542 #ifndef INVARIANTS
543 start_again:
544 #endif
545 TAILQ_FOREACH_SAFE(chk, &stcb->asoc.sent_queue, sctp_next, nchk) {
546 if (SCTP_TSN_GE(stcb->asoc.last_acked_seq, chk->rec.data.TSN_seq)) {
547 /* Strange case our list got out of order? */
548 SCTP_PRINTF("Our list is out of order? last_acked:%x chk:%x\n",
549 (unsigned int)stcb->asoc.last_acked_seq, (unsigned int)chk->rec.data.TSN_seq);
550 recovery_cnt++;
551 #ifdef INVARIANTS
552 panic("last acked >= chk on sent-Q");
553 #else
554 SCTP_PRINTF("Recover attempts a restart cnt:%d\n", recovery_cnt);
555 sctp_recover_sent_list(stcb);
556 if (recovery_cnt < 10) {
557 goto start_again;
558 } else {
559 SCTP_PRINTF("Recovery fails %d times??\n", recovery_cnt);
560 }
561 #endif
562 }
563 if ((chk->whoTo == net) && (chk->sent < SCTP_DATAGRAM_ACKED)) {
564 /*
565 * found one to mark: If it is less than
566 * DATAGRAM_ACKED it MUST not be a skipped or marked
567 * TSN but instead one that is either already set
568 * for retransmission OR one that needs
569 * retransmission.
570 */
571
572 /* validate its been outstanding long enough */
573 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
574 sctp_log_fr(chk->rec.data.TSN_seq,
575 chk->sent_rcv_time.tv_sec,
576 chk->sent_rcv_time.tv_usec,
577 SCTP_FR_T3_MARK_TIME);
578 }
579 if ((chk->sent_rcv_time.tv_sec > min_wait.tv_sec) && (window_probe == 0)) {
580 /*
581 * we have reached a chunk that was sent
582 * some seconds past our min.. forget it we
583 * will find no more to send.
584 */
585 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
586 sctp_log_fr(0,
587 chk->sent_rcv_time.tv_sec,
588 chk->sent_rcv_time.tv_usec,
589 SCTP_FR_T3_STOPPED);
590 }
591 continue;
592 } else if ((chk->sent_rcv_time.tv_sec == min_wait.tv_sec) &&
593 (window_probe == 0)) {
594 /*
595 * we must look at the micro seconds to
596 * know.
597 */
598 if (chk->sent_rcv_time.tv_usec >= min_wait.tv_usec) {
599 /*
600 * ok it was sent after our boundary
601 * time.
602 */
603 continue;
604 }
605 }
606 if (stcb->asoc.prsctp_supported && PR_SCTP_TTL_ENABLED(chk->flags)) {
607 /* Is it expired? */
608 if (timevalcmp(&now, &chk->rec.data.timetodrop, >)) {
609 /* Yes so drop it */
610 if (chk->data) {
611 (void)sctp_release_pr_sctp_chunk(stcb,
612 chk,
613 1,
614 SCTP_SO_NOT_LOCKED);
615 cnt_abandoned++;
616 }
617 continue;
618 }
619 }
620 if (stcb->asoc.prsctp_supported && PR_SCTP_RTX_ENABLED(chk->flags)) {
621 /* Has it been retransmitted tv_sec times? */
622 if (chk->snd_count > chk->rec.data.timetodrop.tv_sec) {
623 if (chk->data) {
624 (void)sctp_release_pr_sctp_chunk(stcb,
625 chk,
626 1,
627 SCTP_SO_NOT_LOCKED);
628 cnt_abandoned++;
629 }
630 continue;
631 }
632 }
633 if (chk->sent < SCTP_DATAGRAM_RESEND) {
634 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
635 num_mk++;
636 if (fir == 0) {
637 fir = 1;
638 tsnfirst = chk->rec.data.TSN_seq;
639 }
640 tsnlast = chk->rec.data.TSN_seq;
641 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
642 sctp_log_fr(chk->rec.data.TSN_seq, chk->snd_count,
643 0, SCTP_FR_T3_MARKED);
644 }
645 if (chk->rec.data.chunk_was_revoked) {
646 /* deflate the cwnd */
647 chk->whoTo->cwnd -= chk->book_size;
648 chk->rec.data.chunk_was_revoked = 0;
649 }
650 net->marked_retrans++;
651 stcb->asoc.marked_retrans++;
652 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
653 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_RSND_TO,
654 chk->whoTo->flight_size,
655 chk->book_size,
656 (uintptr_t) chk->whoTo,
657 chk->rec.data.TSN_seq);
658 }
659 sctp_flight_size_decrease(chk);
660 sctp_total_flight_decrease(stcb, chk);
661 stcb->asoc.peers_rwnd += chk->send_size;
662 stcb->asoc.peers_rwnd += SCTP_BASE_SYSCTL(sctp_peer_chunk_oh);
663 }
664 chk->sent = SCTP_DATAGRAM_RESEND;
665 SCTP_STAT_INCR(sctps_markedretrans);
666
667 /* reset the TSN for striking and other FR stuff */
668 chk->rec.data.doing_fast_retransmit = 0;
669 /* Clear any time so NO RTT is being done */
670
671 if (chk->do_rtt) {
672 if (chk->whoTo->rto_needed == 0) {
673 chk->whoTo->rto_needed = 1;
674 }
675 }
676 chk->do_rtt = 0;
677 if (alt != net) {
678 sctp_free_remote_addr(chk->whoTo);
679 chk->no_fr_allowed = 1;
680 chk->whoTo = alt;
681 atomic_add_int(&alt->ref_count, 1);
682 } else {
683 chk->no_fr_allowed = 0;
684 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
685 chk->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
686 } else {
687 chk->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
688 }
689 }
690 /*
691 * CMT: Do not allow FRs on retransmitted TSNs.
692 */
693 if (stcb->asoc.sctp_cmt_on_off > 0) {
694 chk->no_fr_allowed = 1;
695 }
696 #ifdef THIS_SHOULD_NOT_BE_DONE
697 } else if (chk->sent == SCTP_DATAGRAM_ACKED) {
698 /* remember highest acked one */
699 could_be_sent = chk;
700 #endif
701 }
702 if (chk->sent == SCTP_DATAGRAM_RESEND) {
703 cnt_mk++;
704 }
705 }
706 if ((orig_flight - net->flight_size) != (orig_tf - stcb->asoc.total_flight)) {
707 /* we did not subtract the same things? */
708 audit_tf = 1;
709 }
710 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
711 sctp_log_fr(tsnfirst, tsnlast, num_mk, SCTP_FR_T3_TIMEOUT);
712 }
713 #ifdef SCTP_DEBUG
714 if (num_mk) {
715 SCTPDBG(SCTP_DEBUG_TIMER1, "LAST TSN marked was %x\n",
716 tsnlast);
717 SCTPDBG(SCTP_DEBUG_TIMER1, "Num marked for retransmission was %d peer-rwd:%ld\n",
718 num_mk, (u_long)stcb->asoc.peers_rwnd);
719 SCTPDBG(SCTP_DEBUG_TIMER1, "LAST TSN marked was %x\n",
720 tsnlast);
721 SCTPDBG(SCTP_DEBUG_TIMER1, "Num marked for retransmission was %d peer-rwd:%d\n",
722 num_mk,
723 (int)stcb->asoc.peers_rwnd);
724 }
725 #endif
726 *num_marked = num_mk;
727 *num_abandoned = cnt_abandoned;
728 /*
729 * Now check for a ECN Echo that may be stranded And include the
730 * cnt_mk'd to have all resends in the control queue.
731 */
732 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
733 if (chk->sent == SCTP_DATAGRAM_RESEND) {
734 cnt_mk++;
735 }
736 if ((chk->whoTo == net) &&
737 (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
738 sctp_free_remote_addr(chk->whoTo);
739 chk->whoTo = alt;
740 if (chk->sent != SCTP_DATAGRAM_RESEND) {
741 chk->sent = SCTP_DATAGRAM_RESEND;
742 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
743 cnt_mk++;
744 }
745 atomic_add_int(&alt->ref_count, 1);
746 }
747 }
748 #ifdef THIS_SHOULD_NOT_BE_DONE
749 if ((stcb->asoc.sent_queue_retran_cnt == 0) && (could_be_sent)) {
750 /* fix it so we retransmit the highest acked anyway */
751 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
752 cnt_mk++;
753 could_be_sent->sent = SCTP_DATAGRAM_RESEND;
754 }
755 #endif
756 if (stcb->asoc.sent_queue_retran_cnt != cnt_mk) {
757 #ifdef INVARIANTS
758 SCTP_PRINTF("Local Audit says there are %d for retran asoc cnt:%d we marked:%d this time\n",
759 cnt_mk, stcb->asoc.sent_queue_retran_cnt, num_mk);
760 #endif
761 #ifndef SCTP_AUDITING_ENABLED
762 stcb->asoc.sent_queue_retran_cnt = cnt_mk;
763 #endif
764 }
765 if (audit_tf) {
766 SCTPDBG(SCTP_DEBUG_TIMER4,
767 "Audit total flight due to negative value net:%p\n",
768 (void *)net);
769 stcb->asoc.total_flight = 0;
770 stcb->asoc.total_flight_count = 0;
771 /* Clear all networks flight size */
772 TAILQ_FOREACH(lnets, &stcb->asoc.nets, sctp_next) {
773 lnets->flight_size = 0;
774 SCTPDBG(SCTP_DEBUG_TIMER4,
775 "Net:%p c-f cwnd:%d ssthresh:%d\n",
776 (void *)lnets, lnets->cwnd, lnets->ssthresh);
777 }
778 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
779 if (chk->sent < SCTP_DATAGRAM_RESEND) {
780 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
781 sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
782 chk->whoTo->flight_size,
783 chk->book_size,
784 (uintptr_t) chk->whoTo,
785 chk->rec.data.TSN_seq);
786 }
787 sctp_flight_size_increase(chk);
788 sctp_total_flight_increase(stcb, chk);
789 }
790 }
791 }
792 /* We return 1 if we only have a window probe outstanding */
793 return (0);
794 }
795
796
797 int
798 sctp_t3rxt_timer(struct sctp_inpcb *inp,
799 struct sctp_tcb *stcb,
800 struct sctp_nets *net)
801 {
802 struct sctp_nets *alt;
803 int win_probe, num_mk, num_abandoned;
804
805 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
806 sctp_log_fr(0, 0, 0, SCTP_FR_T3_TIMEOUT);
807 }
808 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
809 struct sctp_nets *lnet;
810
811 TAILQ_FOREACH(lnet, &stcb->asoc.nets, sctp_next) {
812 if (net == lnet) {
813 sctp_log_cwnd(stcb, lnet, 1, SCTP_CWND_LOG_FROM_T3);
814 } else {
815 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_LOG_FROM_T3);
816 }
817 }
818 }
819 /* Find an alternate and mark those for retransmission */
820 if ((stcb->asoc.peers_rwnd == 0) &&
821 (stcb->asoc.total_flight < net->mtu)) {
822 SCTP_STAT_INCR(sctps_timowindowprobe);
823 win_probe = 1;
824 } else {
825 win_probe = 0;
826 }
827
828 if (win_probe == 0) {
829 /* We don't do normal threshold management on window probes */
830 if (sctp_threshold_management(inp, stcb, net,
831 stcb->asoc.max_send_times)) {
832 /* Association was destroyed */
833 return (1);
834 } else {
835 if (net != stcb->asoc.primary_destination) {
836 /* send a immediate HB if our RTO is stale */
837 struct timeval now;
838 unsigned int ms_goneby;
839
840 (void)SCTP_GETTIME_TIMEVAL(&now);
841 if (net->last_sent_time.tv_sec) {
842 ms_goneby = (now.tv_sec - net->last_sent_time.tv_sec) * 1000;
843 } else {
844 ms_goneby = 0;
845 }
846 if ((net->dest_state & SCTP_ADDR_PF) == 0) {
847 if ((ms_goneby > net->RTO) || (net->RTO == 0)) {
848 /*
849 * no recent feed back in an
850 * RTO or more, request a
851 * RTT update
852 */
853 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
854 }
855 }
856 }
857 }
858 } else {
859 /*
860 * For a window probe we don't penalize the net's but only
861 * the association. This may fail it if SACKs are not coming
862 * back. If sack's are coming with rwnd locked at 0, we will
863 * continue to hold things waiting for rwnd to raise
864 */
865 if (sctp_threshold_management(inp, stcb, NULL,
866 stcb->asoc.max_send_times)) {
867 /* Association was destroyed */
868 return (1);
869 }
870 }
871 if (stcb->asoc.sctp_cmt_on_off > 0) {
872 if (net->pf_threshold < net->failure_threshold) {
873 alt = sctp_find_alternate_net(stcb, net, 2);
874 } else {
875 /*
876 * CMT: Using RTX_SSTHRESH policy for CMT. If CMT is
877 * being used, then pick dest with largest ssthresh
878 * for any retransmission.
879 */
880 alt = sctp_find_alternate_net(stcb, net, 1);
881 /*
882 * CUCv2: If a different dest is picked for the
883 * retransmission, then new (rtx-)pseudo_cumack
884 * needs to be tracked for orig dest. Let CUCv2
885 * track new (rtx-) pseudo-cumack always.
886 */
887 net->find_pseudo_cumack = 1;
888 net->find_rtx_pseudo_cumack = 1;
889 }
890 } else {
891 alt = sctp_find_alternate_net(stcb, net, 0);
892 }
893
894 num_mk = 0;
895 num_abandoned = 0;
896 (void)sctp_mark_all_for_resend(stcb, net, alt, win_probe,
897 &num_mk, &num_abandoned);
898 /* FR Loss recovery just ended with the T3. */
899 stcb->asoc.fast_retran_loss_recovery = 0;
900
901 /* CMT FR loss recovery ended with the T3 */
902 net->fast_retran_loss_recovery = 0;
903 if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
904 (net->flight_size == 0)) {
905 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
906 }
907 /*
908 * setup the sat loss recovery that prevents satellite cwnd advance.
909 */
910 stcb->asoc.sat_t3_loss_recovery = 1;
911 stcb->asoc.sat_t3_recovery_tsn = stcb->asoc.sending_seq;
912
913 /* Backoff the timer and cwnd */
914 sctp_backoff_on_timeout(stcb, net, win_probe, num_mk, num_abandoned);
915 if ((!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
916 (net->dest_state & SCTP_ADDR_PF)) {
917 /* Move all pending over too */
918 sctp_move_chunks_from_net(stcb, net);
919
920 /*
921 * Get the address that failed, to force a new src address
922 * selecton and a route allocation.
923 */
924 if (net->ro._s_addr) {
925 sctp_free_ifa(net->ro._s_addr);
926 net->ro._s_addr = NULL;
927 }
928 net->src_addr_selected = 0;
929
930 /* Force a route allocation too */
931 if (net->ro.ro_rt) {
932 RTFREE(net->ro.ro_rt);
933 net->ro.ro_rt = NULL;
934 }
935 /* Was it our primary? */
936 if ((stcb->asoc.primary_destination == net) && (alt != net)) {
937 /*
938 * Yes, note it as such and find an alternate note:
939 * this means HB code must use this to resent the
940 * primary if it goes active AND if someone does a
941 * change-primary then this flag must be cleared
942 * from any net structures.
943 */
944 if (stcb->asoc.alternate) {
945 sctp_free_remote_addr(stcb->asoc.alternate);
946 }
947 stcb->asoc.alternate = alt;
948 atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
949 }
950 }
951 /*
952 * Special case for cookie-echo'ed case, we don't do output but must
953 * await the COOKIE-ACK before retransmission
954 */
955 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
956 /*
957 * Here we just reset the timer and start again since we
958 * have not established the asoc
959 */
960 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
961 return (0);
962 }
963 if (stcb->asoc.prsctp_supported) {
964 struct sctp_tmit_chunk *lchk;
965
966 lchk = sctp_try_advance_peer_ack_point(stcb, &stcb->asoc);
967 /* C3. See if we need to send a Fwd-TSN */
968 if (SCTP_TSN_GT(stcb->asoc.advanced_peer_ack_point, stcb->asoc.last_acked_seq)) {
969 send_forward_tsn(stcb, &stcb->asoc);
970 if (lchk) {
971 /* Assure a timer is up */
972 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, lchk->whoTo);
973 }
974 }
975 }
976 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
977 sctp_log_cwnd(stcb, net, net->cwnd, SCTP_CWND_LOG_FROM_RTX);
978 }
979 return (0);
980 }
981
982 int
983 sctp_t1init_timer(struct sctp_inpcb *inp,
984 struct sctp_tcb *stcb,
985 struct sctp_nets *net)
986 {
987 /* bump the thresholds */
988 if (stcb->asoc.delayed_connection) {
989 /*
990 * special hook for delayed connection. The library did NOT
991 * complete the rest of its sends.
992 */
993 stcb->asoc.delayed_connection = 0;
994 sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
995 return (0);
996 }
997 if (SCTP_GET_STATE((&stcb->asoc)) != SCTP_STATE_COOKIE_WAIT) {
998 return (0);
999 }
1000 if (sctp_threshold_management(inp, stcb, net,
1001 stcb->asoc.max_init_times)) {
1002 /* Association was destroyed */
1003 return (1);
1004 }
1005 stcb->asoc.dropped_special_cnt = 0;
1006 sctp_backoff_on_timeout(stcb, stcb->asoc.primary_destination, 1, 0, 0);
1007 if (stcb->asoc.initial_init_rto_max < net->RTO) {
1008 net->RTO = stcb->asoc.initial_init_rto_max;
1009 }
1010 if (stcb->asoc.numnets > 1) {
1011 /* If we have more than one addr use it */
1012 struct sctp_nets *alt;
1013
1014 alt = sctp_find_alternate_net(stcb, stcb->asoc.primary_destination, 0);
1015 if (alt != stcb->asoc.primary_destination) {
1016 sctp_move_chunks_from_net(stcb, stcb->asoc.primary_destination);
1017 stcb->asoc.primary_destination = alt;
1018 }
1019 }
1020 /* Send out a new init */
1021 sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
1022 return (0);
1023 }
1024
1025 /*
1026 * For cookie and asconf we actually need to find and mark for resend, then
1027 * increment the resend counter (after all the threshold management stuff of
1028 * course).
1029 */
1030 int
1031 sctp_cookie_timer(struct sctp_inpcb *inp,
1032 struct sctp_tcb *stcb,
1033 struct sctp_nets *net SCTP_UNUSED)
1034 {
1035 struct sctp_nets *alt;
1036 struct sctp_tmit_chunk *cookie;
1037
1038 /* first before all else we must find the cookie */
1039 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, sctp_next) {
1040 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
1041 break;
1042 }
1043 }
1044 if (cookie == NULL) {
1045 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
1046 /* FOOBAR! */
1047 struct mbuf *op_err;
1048
1049 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION,
1050 "Cookie timer expired, but no cookie");
1051 inp->last_abort_code = SCTP_FROM_SCTP_TIMER + SCTP_LOC_3;
1052 sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED);
1053 } else {
1054 #ifdef INVARIANTS
1055 panic("Cookie timer expires in wrong state?");
1056 #else
1057 SCTP_PRINTF("Strange in state %d not cookie-echoed yet c-e timer expires?\n", SCTP_GET_STATE(&stcb->asoc));
1058 return (0);
1059 #endif
1060 }
1061 return (0);
1062 }
1063 /* Ok we found the cookie, threshold management next */
1064 if (sctp_threshold_management(inp, stcb, cookie->whoTo,
1065 stcb->asoc.max_init_times)) {
1066 /* Assoc is over */
1067 return (1);
1068 }
1069 /*
1070 * cleared theshold management now lets backoff the address & select
1071 * an alternate
1072 */
1073 stcb->asoc.dropped_special_cnt = 0;
1074 sctp_backoff_on_timeout(stcb, cookie->whoTo, 1, 0, 0);
1075 alt = sctp_find_alternate_net(stcb, cookie->whoTo, 0);
1076 if (alt != cookie->whoTo) {
1077 sctp_free_remote_addr(cookie->whoTo);
1078 cookie->whoTo = alt;
1079 atomic_add_int(&alt->ref_count, 1);
1080 }
1081 /* Now mark the retran info */
1082 if (cookie->sent != SCTP_DATAGRAM_RESEND) {
1083 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1084 }
1085 cookie->sent = SCTP_DATAGRAM_RESEND;
1086 /*
1087 * Now call the output routine to kick out the cookie again, Note we
1088 * don't mark any chunks for retran so that FR will need to kick in
1089 * to move these (or a send timer).
1090 */
1091 return (0);
1092 }
1093
1094 int
1095 sctp_strreset_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1096 struct sctp_nets *net)
1097 {
1098 struct sctp_nets *alt;
1099 struct sctp_tmit_chunk *strrst = NULL, *chk = NULL;
1100
1101 if (stcb->asoc.stream_reset_outstanding == 0) {
1102 return (0);
1103 }
1104 /* find the existing STRRESET, we use the seq number we sent out on */
1105 (void)sctp_find_stream_reset(stcb, stcb->asoc.str_reset_seq_out, &strrst);
1106 if (strrst == NULL) {
1107 return (0);
1108 }
1109 /* do threshold management */
1110 if (sctp_threshold_management(inp, stcb, strrst->whoTo,
1111 stcb->asoc.max_send_times)) {
1112 /* Assoc is over */
1113 return (1);
1114 }
1115 /*
1116 * cleared theshold management now lets backoff the address & select
1117 * an alternate
1118 */
1119 sctp_backoff_on_timeout(stcb, strrst->whoTo, 1, 0, 0);
1120 alt = sctp_find_alternate_net(stcb, strrst->whoTo, 0);
1121 sctp_free_remote_addr(strrst->whoTo);
1122 strrst->whoTo = alt;
1123 atomic_add_int(&alt->ref_count, 1);
1124
1125 /* See if a ECN Echo is also stranded */
1126 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
1127 if ((chk->whoTo == net) &&
1128 (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
1129 sctp_free_remote_addr(chk->whoTo);
1130 if (chk->sent != SCTP_DATAGRAM_RESEND) {
1131 chk->sent = SCTP_DATAGRAM_RESEND;
1132 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1133 }
1134 chk->whoTo = alt;
1135 atomic_add_int(&alt->ref_count, 1);
1136 }
1137 }
1138 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
1139 /*
1140 * If the address went un-reachable, we need to move to
1141 * alternates for ALL chk's in queue
1142 */
1143 sctp_move_chunks_from_net(stcb, net);
1144 }
1145 /* mark the retran info */
1146 if (strrst->sent != SCTP_DATAGRAM_RESEND)
1147 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1148 strrst->sent = SCTP_DATAGRAM_RESEND;
1149
1150 /* restart the timer */
1151 sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, inp, stcb, strrst->whoTo);
1152 return (0);
1153 }
1154
1155 int
1156 sctp_asconf_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1157 struct sctp_nets *net)
1158 {
1159 struct sctp_nets *alt;
1160 struct sctp_tmit_chunk *asconf, *chk;
1161
1162 /* is this a first send, or a retransmission? */
1163 if (TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) {
1164 /* compose a new ASCONF chunk and send it */
1165 sctp_send_asconf(stcb, net, SCTP_ADDR_NOT_LOCKED);
1166 } else {
1167 /*
1168 * Retransmission of the existing ASCONF is needed
1169 */
1170
1171 /* find the existing ASCONF */
1172 asconf = TAILQ_FIRST(&stcb->asoc.asconf_send_queue);
1173 if (asconf == NULL) {
1174 return (0);
1175 }
1176 /* do threshold management */
1177 if (sctp_threshold_management(inp, stcb, asconf->whoTo,
1178 stcb->asoc.max_send_times)) {
1179 /* Assoc is over */
1180 return (1);
1181 }
1182 if (asconf->snd_count > stcb->asoc.max_send_times) {
1183 /*
1184 * Something is rotten: our peer is not responding
1185 * to ASCONFs but apparently is to other chunks.
1186 * i.e. it is not properly handling the chunk type
1187 * upper bits. Mark this peer as ASCONF incapable
1188 * and cleanup.
1189 */
1190 SCTPDBG(SCTP_DEBUG_TIMER1, "asconf_timer: Peer has not responded to our repeated ASCONFs\n");
1191 sctp_asconf_cleanup(stcb, net);
1192 return (0);
1193 }
1194 /*
1195 * cleared threshold management, so now backoff the net and
1196 * select an alternate
1197 */
1198 sctp_backoff_on_timeout(stcb, asconf->whoTo, 1, 0, 0);
1199 alt = sctp_find_alternate_net(stcb, asconf->whoTo, 0);
1200 if (asconf->whoTo != alt) {
1201 sctp_free_remote_addr(asconf->whoTo);
1202 asconf->whoTo = alt;
1203 atomic_add_int(&alt->ref_count, 1);
1204 }
1205 /* See if an ECN Echo is also stranded */
1206 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
1207 if ((chk->whoTo == net) &&
1208 (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
1209 sctp_free_remote_addr(chk->whoTo);
1210 chk->whoTo = alt;
1211 if (chk->sent != SCTP_DATAGRAM_RESEND) {
1212 chk->sent = SCTP_DATAGRAM_RESEND;
1213 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1214 }
1215 atomic_add_int(&alt->ref_count, 1);
1216 }
1217 }
1218 TAILQ_FOREACH(chk, &stcb->asoc.asconf_send_queue, sctp_next) {
1219 if (chk->whoTo != alt) {
1220 sctp_free_remote_addr(chk->whoTo);
1221 chk->whoTo = alt;
1222 atomic_add_int(&alt->ref_count, 1);
1223 }
1224 if (asconf->sent != SCTP_DATAGRAM_RESEND && chk->sent != SCTP_DATAGRAM_UNSENT)
1225 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1226 chk->sent = SCTP_DATAGRAM_RESEND;
1227 }
1228 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
1229 /*
1230 * If the address went un-reachable, we need to move
1231 * to the alternate for ALL chunks in queue
1232 */
1233 sctp_move_chunks_from_net(stcb, net);
1234 }
1235 /* mark the retran info */
1236 if (asconf->sent != SCTP_DATAGRAM_RESEND)
1237 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1238 asconf->sent = SCTP_DATAGRAM_RESEND;
1239
1240 /* send another ASCONF if any and we can do */
1241 sctp_send_asconf(stcb, alt, SCTP_ADDR_NOT_LOCKED);
1242 }
1243 return (0);
1244 }
1245
1246 /* Mobility adaptation */
1247 void
1248 sctp_delete_prim_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1249 struct sctp_nets *net SCTP_UNUSED)
1250 {
1251 if (stcb->asoc.deleted_primary == NULL) {
1252 SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: deleted_primary is not stored...\n");
1253 sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
1254 return;
1255 }
1256 SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: finished to keep deleted primary ");
1257 SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, &stcb->asoc.deleted_primary->ro._l_addr.sa);
1258 sctp_free_remote_addr(stcb->asoc.deleted_primary);
1259 stcb->asoc.deleted_primary = NULL;
1260 sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
1261 return;
1262 }
1263
1264 /*
1265 * For the shutdown and shutdown-ack, we do not keep one around on the
1266 * control queue. This means we must generate a new one and call the general
1267 * chunk output routine, AFTER having done threshold management.
1268 * It is assumed that net is non-NULL.
1269 */
1270 int
1271 sctp_shutdown_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1272 struct sctp_nets *net)
1273 {
1274 struct sctp_nets *alt;
1275
1276 /* first threshold managment */
1277 if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
1278 /* Assoc is over */
1279 return (1);
1280 }
1281 sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
1282 /* second select an alternative */
1283 alt = sctp_find_alternate_net(stcb, net, 0);
1284
1285 /* third generate a shutdown into the queue for out net */
1286 sctp_send_shutdown(stcb, alt);
1287
1288 /* fourth restart timer */
1289 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, inp, stcb, alt);
1290 return (0);
1291 }
1292
1293 int
1294 sctp_shutdownack_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1295 struct sctp_nets *net)
1296 {
1297 struct sctp_nets *alt;
1298
1299 /* first threshold managment */
1300 if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
1301 /* Assoc is over */
1302 return (1);
1303 }
1304 sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
1305 /* second select an alternative */
1306 alt = sctp_find_alternate_net(stcb, net, 0);
1307
1308 /* third generate a shutdown into the queue for out net */
1309 sctp_send_shutdown_ack(stcb, alt);
1310
1311 /* fourth restart timer */
1312 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, inp, stcb, alt);
1313 return (0);
1314 }
1315
1316 static void
1317 sctp_audit_stream_queues_for_size(struct sctp_inpcb *inp,
1318 struct sctp_tcb *stcb)
1319 {
1320 struct sctp_stream_queue_pending *sp;
1321 unsigned int i, chks_in_queue = 0;
1322 int being_filled = 0;
1323
1324 /*
1325 * This function is ONLY called when the send/sent queues are empty.
1326 */
1327 if ((stcb == NULL) || (inp == NULL))
1328 return;
1329
1330 if (stcb->asoc.sent_queue_retran_cnt) {
1331 SCTP_PRINTF("Hmm, sent_queue_retran_cnt is non-zero %d\n",
1332 stcb->asoc.sent_queue_retran_cnt);
1333 stcb->asoc.sent_queue_retran_cnt = 0;
1334 }
1335 if (stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
1336 /* No stream scheduler information, initialize scheduler */
1337 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 0);
1338 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
1339 /* yep, we lost a stream or two */
1340 SCTP_PRINTF("Found additional streams NOT managed by scheduler, corrected\n");
1341 } else {
1342 /* no streams lost */
1343 stcb->asoc.total_output_queue_size = 0;
1344 }
1345 }
1346 /* Check to see if some data queued, if so report it */
1347 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1348 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
1349 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
1350 if (sp->msg_is_complete)
1351 being_filled++;
1352 chks_in_queue++;
1353 }
1354 }
1355 }
1356 if (chks_in_queue != stcb->asoc.stream_queue_cnt) {
1357 SCTP_PRINTF("Hmm, stream queue cnt at %d I counted %d in stream out wheel\n",
1358 stcb->asoc.stream_queue_cnt, chks_in_queue);
1359 }
1360 if (chks_in_queue) {
1361 /* call the output queue function */
1362 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_T3, SCTP_SO_NOT_LOCKED);
1363 if ((TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
1364 (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
1365 /*
1366 * Probably should go in and make it go back through
1367 * and add fragments allowed
1368 */
1369 if (being_filled == 0) {
1370 SCTP_PRINTF("Still nothing moved %d chunks are stuck\n",
1371 chks_in_queue);
1372 }
1373 }
1374 } else {
1375 SCTP_PRINTF("Found no chunks on any queue tot:%lu\n",
1376 (u_long)stcb->asoc.total_output_queue_size);
1377 stcb->asoc.total_output_queue_size = 0;
1378 }
1379 }
1380
1381 int
1382 sctp_heartbeat_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1383 struct sctp_nets *net)
1384 {
1385 uint8_t net_was_pf;
1386
1387 if (net->dest_state & SCTP_ADDR_PF) {
1388 net_was_pf = 1;
1389 } else {
1390 net_was_pf = 0;
1391 }
1392 if (net->hb_responded == 0) {
1393 if (net->ro._s_addr) {
1394 /*
1395 * Invalidate the src address if we did not get a
1396 * response last time.
1397 */
1398 sctp_free_ifa(net->ro._s_addr);
1399 net->ro._s_addr = NULL;
1400 net->src_addr_selected = 0;
1401 }
1402 sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
1403 if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
1404 /* Assoc is over */
1405 return (1);
1406 }
1407 }
1408 /* Zero PBA, if it needs it */
1409 if (net->partial_bytes_acked) {
1410 net->partial_bytes_acked = 0;
1411 }
1412 if ((stcb->asoc.total_output_queue_size > 0) &&
1413 (TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
1414 (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
1415 sctp_audit_stream_queues_for_size(inp, stcb);
1416 }
1417 if (!(net->dest_state & SCTP_ADDR_NOHB) &&
1418 !((net_was_pf == 0) && (net->dest_state & SCTP_ADDR_PF))) {
1419 /*
1420 * when move to PF during threshold mangement, a HB has been
1421 * queued in that routine
1422 */
1423 uint32_t ms_gone_by;
1424
1425 if ((net->last_sent_time.tv_sec > 0) ||
1426 (net->last_sent_time.tv_usec > 0)) {
1427 struct timeval diff;
1428
1429 SCTP_GETTIME_TIMEVAL(&diff);
1430 timevalsub(&diff, &net->last_sent_time);
1431 ms_gone_by = (uint32_t) (diff.tv_sec * 1000) +
1432 (uint32_t) (diff.tv_usec / 1000);
1433 } else {
1434 ms_gone_by = 0xffffffff;
1435 }
1436 if ((ms_gone_by >= net->heart_beat_delay) ||
1437 (net->dest_state & SCTP_ADDR_PF)) {
1438 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
1439 }
1440 }
1441 return (0);
1442 }
1443
1444 void
1445 sctp_pathmtu_timer(struct sctp_inpcb *inp,
1446 struct sctp_tcb *stcb,
1447 struct sctp_nets *net)
1448 {
1449 uint32_t next_mtu, mtu;
1450
1451 next_mtu = sctp_get_next_mtu(net->mtu);
1452
1453 if ((next_mtu > net->mtu) && (net->port == 0)) {
1454 if ((net->src_addr_selected == 0) ||
1455 (net->ro._s_addr == NULL) ||
1456 (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
1457 if ((net->ro._s_addr != NULL) && (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
1458 sctp_free_ifa(net->ro._s_addr);
1459 net->ro._s_addr = NULL;
1460 net->src_addr_selected = 0;
1461 } else if (net->ro._s_addr == NULL) {
1462 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
1463 if (net->ro._l_addr.sa.sa_family == AF_INET6) {
1464 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1465
1466 /* KAME hack: embed scopeid */
1467 (void)sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
1468 }
1469 #endif
1470
1471 net->ro._s_addr = sctp_source_address_selection(inp,
1472 stcb,
1473 (sctp_route_t *) & net->ro,
1474 net, 0, stcb->asoc.vrf_id);
1475 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
1476 if (net->ro._l_addr.sa.sa_family == AF_INET6) {
1477 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1478
1479 (void)sa6_recoverscope(sin6);
1480 }
1481 #endif /* INET6 */
1482 }
1483 if (net->ro._s_addr)
1484 net->src_addr_selected = 1;
1485 }
1486 if (net->ro._s_addr) {
1487 mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._s_addr.sa, net->ro.ro_rt);
1488 #if defined(INET) || defined(INET6)
1489 if (net->port) {
1490 mtu -= sizeof(struct udphdr);
1491 }
1492 #endif
1493 if (mtu > next_mtu) {
1494 net->mtu = next_mtu;
1495 }
1496 }
1497 }
1498 /* restart the timer */
1499 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net);
1500 }
1501
1502 void
1503 sctp_autoclose_timer(struct sctp_inpcb *inp,
1504 struct sctp_tcb *stcb,
1505 struct sctp_nets *net)
1506 {
1507 struct timeval tn, *tim_touse;
1508 struct sctp_association *asoc;
1509 int ticks_gone_by;
1510
1511 (void)SCTP_GETTIME_TIMEVAL(&tn);
1512 if (stcb->asoc.sctp_autoclose_ticks &&
1513 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1514 /* Auto close is on */
1515 asoc = &stcb->asoc;
1516 /* pick the time to use */
1517 if (asoc->time_last_rcvd.tv_sec >
1518 asoc->time_last_sent.tv_sec) {
1519 tim_touse = &asoc->time_last_rcvd;
1520 } else {
1521 tim_touse = &asoc->time_last_sent;
1522 }
1523 /* Now has long enough transpired to autoclose? */
1524 ticks_gone_by = SEC_TO_TICKS(tn.tv_sec - tim_touse->tv_sec);
1525 if ((ticks_gone_by > 0) &&
1526 (ticks_gone_by >= (int)asoc->sctp_autoclose_ticks)) {
1527 /*
1528 * autoclose time has hit, call the output routine,
1529 * which should do nothing just to be SURE we don't
1530 * have hanging data. We can then safely check the
1531 * queues and know that we are clear to send
1532 * shutdown
1533 */
1534 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_AUTOCLOSE_TMR, SCTP_SO_NOT_LOCKED);
1535 /* Are we clean? */
1536 if (TAILQ_EMPTY(&asoc->send_queue) &&
1537 TAILQ_EMPTY(&asoc->sent_queue)) {
1538 /*
1539 * there is nothing queued to send, so I'm
1540 * done...
1541 */
1542 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
1543 /* only send SHUTDOWN 1st time thru */
1544 struct sctp_nets *netp;
1545
1546 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
1547 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
1548 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
1549 }
1550 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
1551 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
1552 sctp_stop_timers_for_shutdown(stcb);
1553 if (stcb->asoc.alternate) {
1554 netp = stcb->asoc.alternate;
1555 } else {
1556 netp = stcb->asoc.primary_destination;
1557 }
1558 sctp_send_shutdown(stcb, netp);
1559 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
1560 stcb->sctp_ep, stcb,
1561 netp);
1562 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1563 stcb->sctp_ep, stcb,
1564 netp);
1565 }
1566 }
1567 } else {
1568 /*
1569 * No auto close at this time, reset t-o to check
1570 * later
1571 */
1572 int tmp;
1573
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,
1578 net);
1579 /* restore the real tick value */
1580 asoc->sctp_autoclose_ticks = tmp;
1581 }
1582 }
1583 }
Cache object: e7019e4012be3c7381f032de82fb5a78
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