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/11.1/sys/netinet/sctp_timer.c 319407 2017-06-01 09:18:03Z 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 static 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 inp, stcb, net,
115 SCTP_FROM_SCTP_TIMER + SCTP_LOC_1);
116 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, inp, 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_BASE_SYSCTL(sctp_diag_info_code),
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 } /* JRS 5/14/07 - If mode is set to 1, use the
290 * CMT policy for choosing an alternate net. */
291 else if (mode == 1) {
292 TAILQ_FOREACH(mnet, &stcb->asoc.nets, sctp_next) {
293 if (((mnet->dest_state & SCTP_ADDR_REACHABLE) != SCTP_ADDR_REACHABLE) ||
294 (mnet->dest_state & SCTP_ADDR_UNCONFIRMED)) {
295 /*
296 * will skip ones that are not-reachable or
297 * unconfirmed
298 */
299 continue;
300 }
301 if (max_cwnd < mnet->cwnd) {
302 max_cwnd_net = mnet;
303 max_cwnd = mnet->cwnd;
304 } else if (max_cwnd == mnet->cwnd) {
305 uint32_t rndval;
306 uint8_t this_random;
307
308 if (stcb->asoc.hb_random_idx > 3) {
309 rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
310 memcpy(stcb->asoc.hb_random_values, &rndval,
311 sizeof(stcb->asoc.hb_random_values));
312 this_random = stcb->asoc.hb_random_values[0];
313 stcb->asoc.hb_random_idx = 0;
314 stcb->asoc.hb_ect_randombit = 0;
315 } else {
316 this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
317 stcb->asoc.hb_random_idx++;
318 stcb->asoc.hb_ect_randombit = 0;
319 }
320 if (this_random % 2) {
321 max_cwnd_net = mnet;
322 max_cwnd = mnet->cwnd;
323 }
324 }
325 }
326 if (max_cwnd_net) {
327 return (max_cwnd_net);
328 }
329 }
330 mnet = net;
331 once = 0;
332
333 if (mnet == NULL) {
334 mnet = TAILQ_FIRST(&stcb->asoc.nets);
335 if (mnet == NULL) {
336 return (NULL);
337 }
338 }
339 for (;;) {
340 alt = TAILQ_NEXT(mnet, sctp_next);
341 if (alt == NULL) {
342 once++;
343 if (once > 1) {
344 break;
345 }
346 alt = TAILQ_FIRST(&stcb->asoc.nets);
347 if (alt == NULL) {
348 return (NULL);
349 }
350 }
351 if (alt->ro.ro_rt == NULL) {
352 if (alt->ro._s_addr) {
353 sctp_free_ifa(alt->ro._s_addr);
354 alt->ro._s_addr = NULL;
355 }
356 alt->src_addr_selected = 0;
357 }
358 if (((alt->dest_state & SCTP_ADDR_REACHABLE) == SCTP_ADDR_REACHABLE) &&
359 (alt->ro.ro_rt != NULL) &&
360 (!(alt->dest_state & SCTP_ADDR_UNCONFIRMED))) {
361 /* Found a reachable address */
362 break;
363 }
364 mnet = alt;
365 }
366
367 if (alt == NULL) {
368 /* Case where NO insv network exists (dormant state) */
369 /* we rotate destinations */
370 once = 0;
371 mnet = net;
372 for (;;) {
373 if (mnet == NULL) {
374 return (TAILQ_FIRST(&stcb->asoc.nets));
375 }
376 alt = TAILQ_NEXT(mnet, sctp_next);
377 if (alt == NULL) {
378 once++;
379 if (once > 1) {
380 break;
381 }
382 alt = TAILQ_FIRST(&stcb->asoc.nets);
383 if (alt == NULL) {
384 break;
385 }
386 }
387 if ((!(alt->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
388 (alt != net)) {
389 /* Found an alternate address */
390 break;
391 }
392 mnet = alt;
393 }
394 }
395 if (alt == NULL) {
396 return (net);
397 }
398 return (alt);
399 }
400
401 static void
402 sctp_backoff_on_timeout(struct sctp_tcb *stcb,
403 struct sctp_nets *net,
404 int win_probe,
405 int num_marked, int num_abandoned)
406 {
407 if (net->RTO == 0) {
408 if (net->RTO_measured) {
409 net->RTO = stcb->asoc.minrto;
410 } else {
411 net->RTO = stcb->asoc.initial_rto;
412 }
413 }
414 net->RTO <<= 1;
415 if (net->RTO > stcb->asoc.maxrto) {
416 net->RTO = stcb->asoc.maxrto;
417 }
418 if ((win_probe == 0) && (num_marked || num_abandoned)) {
419 /* We don't apply penalty to window probe scenarios */
420 /* JRS - Use the congestion control given in the CC module */
421 stcb->asoc.cc_functions.sctp_cwnd_update_after_timeout(stcb, net);
422 }
423 }
424
425 #ifndef INVARIANTS
426 static void
427 sctp_recover_sent_list(struct sctp_tcb *stcb)
428 {
429 struct sctp_tmit_chunk *chk, *nchk;
430 struct sctp_association *asoc;
431
432 asoc = &stcb->asoc;
433 TAILQ_FOREACH_SAFE(chk, &asoc->sent_queue, sctp_next, nchk) {
434 if (SCTP_TSN_GE(asoc->last_acked_seq, chk->rec.data.tsn)) {
435 SCTP_PRINTF("Found chk:%p tsn:%x <= last_acked_seq:%x\n",
436 (void *)chk, chk->rec.data.tsn, asoc->last_acked_seq);
437 if (chk->sent != SCTP_DATAGRAM_NR_ACKED) {
438 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) {
439 asoc->strmout[chk->rec.data.sid].chunks_on_queues--;
440 }
441 }
442 if ((asoc->strmout[chk->rec.data.sid].chunks_on_queues == 0) &&
443 (asoc->strmout[chk->rec.data.sid].state == SCTP_STREAM_RESET_PENDING) &&
444 TAILQ_EMPTY(&asoc->strmout[chk->rec.data.sid].outqueue)) {
445 asoc->trigger_reset = 1;
446 }
447 TAILQ_REMOVE(&asoc->sent_queue, chk, sctp_next);
448 if (PR_SCTP_ENABLED(chk->flags)) {
449 if (asoc->pr_sctp_cnt != 0)
450 asoc->pr_sctp_cnt--;
451 }
452 if (chk->data) {
453 /* sa_ignore NO_NULL_CHK */
454 sctp_free_bufspace(stcb, asoc, chk, 1);
455 sctp_m_freem(chk->data);
456 chk->data = NULL;
457 if (asoc->prsctp_supported && PR_SCTP_BUF_ENABLED(chk->flags)) {
458 asoc->sent_queue_cnt_removeable--;
459 }
460 }
461 asoc->sent_queue_cnt--;
462 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
463 }
464 }
465 SCTP_PRINTF("after recover order is as follows\n");
466 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
467 SCTP_PRINTF("chk:%p TSN:%x\n", (void *)chk, chk->rec.data.tsn);
468 }
469 }
470 #endif
471
472 static int
473 sctp_mark_all_for_resend(struct sctp_tcb *stcb,
474 struct sctp_nets *net,
475 struct sctp_nets *alt,
476 int window_probe,
477 int *num_marked,
478 int *num_abandoned)
479 {
480
481 /*
482 * Mark all chunks (well not all) that were sent to *net for
483 * retransmission. Move them to alt for there destination as well...
484 * We only mark chunks that have been outstanding long enough to
485 * have received feed-back.
486 */
487 struct sctp_tmit_chunk *chk, *nchk;
488 struct sctp_nets *lnets;
489 struct timeval now, min_wait, tv;
490 int cur_rto;
491 int cnt_abandoned;
492 int audit_tf, num_mk, fir;
493 unsigned int cnt_mk;
494 uint32_t orig_flight, orig_tf;
495 uint32_t tsnlast, tsnfirst;
496 int recovery_cnt = 0;
497
498
499 /* none in flight now */
500 audit_tf = 0;
501 fir = 0;
502 /*
503 * figure out how long a data chunk must be pending before we can
504 * mark it ..
505 */
506 (void)SCTP_GETTIME_TIMEVAL(&now);
507 /* get cur rto in micro-seconds */
508 cur_rto = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv;
509 cur_rto *= 1000;
510 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
511 sctp_log_fr(cur_rto,
512 stcb->asoc.peers_rwnd,
513 window_probe,
514 SCTP_FR_T3_MARK_TIME);
515 sctp_log_fr(net->flight_size, 0, 0, SCTP_FR_CWND_REPORT);
516 sctp_log_fr(net->flight_size, net->cwnd, stcb->asoc.total_flight, SCTP_FR_CWND_REPORT);
517 }
518 tv.tv_sec = cur_rto / 1000000;
519 tv.tv_usec = cur_rto % 1000000;
520 min_wait = now;
521 timevalsub(&min_wait, &tv);
522 if (min_wait.tv_sec < 0 || min_wait.tv_usec < 0) {
523 /*
524 * if we hit here, we don't have enough seconds on the clock
525 * to account for the RTO. We just let the lower seconds be
526 * the bounds and don't worry about it. This may mean we
527 * will mark a lot more than we should.
528 */
529 min_wait.tv_sec = min_wait.tv_usec = 0;
530 }
531 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
532 sctp_log_fr(cur_rto, now.tv_sec, now.tv_usec, SCTP_FR_T3_MARK_TIME);
533 sctp_log_fr(0, min_wait.tv_sec, min_wait.tv_usec, SCTP_FR_T3_MARK_TIME);
534 }
535 /*
536 * Our rwnd will be incorrect here since we are not adding back the
537 * cnt * mbuf but we will fix that down below.
538 */
539 orig_flight = net->flight_size;
540 orig_tf = stcb->asoc.total_flight;
541
542 net->fast_retran_ip = 0;
543 /* Now on to each chunk */
544 cnt_abandoned = 0;
545 num_mk = cnt_mk = 0;
546 tsnfirst = tsnlast = 0;
547 #ifndef INVARIANTS
548 start_again:
549 #endif
550 TAILQ_FOREACH_SAFE(chk, &stcb->asoc.sent_queue, sctp_next, nchk) {
551 if (SCTP_TSN_GE(stcb->asoc.last_acked_seq, chk->rec.data.tsn)) {
552 /* Strange case our list got out of order? */
553 SCTP_PRINTF("Our list is out of order? last_acked:%x chk:%x\n",
554 (unsigned int)stcb->asoc.last_acked_seq, (unsigned int)chk->rec.data.tsn);
555 recovery_cnt++;
556 #ifdef INVARIANTS
557 panic("last acked >= chk on sent-Q");
558 #else
559 SCTP_PRINTF("Recover attempts a restart cnt:%d\n", recovery_cnt);
560 sctp_recover_sent_list(stcb);
561 if (recovery_cnt < 10) {
562 goto start_again;
563 } else {
564 SCTP_PRINTF("Recovery fails %d times??\n", recovery_cnt);
565 }
566 #endif
567 }
568 if ((chk->whoTo == net) && (chk->sent < SCTP_DATAGRAM_ACKED)) {
569 /*
570 * found one to mark: If it is less than
571 * DATAGRAM_ACKED it MUST not be a skipped or marked
572 * TSN but instead one that is either already set
573 * for retransmission OR one that needs
574 * retransmission.
575 */
576
577 /* validate its been outstanding long enough */
578 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
579 sctp_log_fr(chk->rec.data.tsn,
580 chk->sent_rcv_time.tv_sec,
581 chk->sent_rcv_time.tv_usec,
582 SCTP_FR_T3_MARK_TIME);
583 }
584 if ((chk->sent_rcv_time.tv_sec > min_wait.tv_sec) && (window_probe == 0)) {
585 /*
586 * we have reached a chunk that was sent
587 * some seconds past our min.. forget it we
588 * will find no more to send.
589 */
590 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
591 sctp_log_fr(0,
592 chk->sent_rcv_time.tv_sec,
593 chk->sent_rcv_time.tv_usec,
594 SCTP_FR_T3_STOPPED);
595 }
596 continue;
597 } else if ((chk->sent_rcv_time.tv_sec == min_wait.tv_sec) &&
598 (window_probe == 0)) {
599 /*
600 * we must look at the micro seconds to
601 * know.
602 */
603 if (chk->sent_rcv_time.tv_usec >= min_wait.tv_usec) {
604 /*
605 * ok it was sent after our boundary
606 * time.
607 */
608 continue;
609 }
610 }
611 if (stcb->asoc.prsctp_supported && PR_SCTP_TTL_ENABLED(chk->flags)) {
612 /* Is it expired? */
613 if (timevalcmp(&now, &chk->rec.data.timetodrop, >)) {
614 /* Yes so drop it */
615 if (chk->data) {
616 (void)sctp_release_pr_sctp_chunk(stcb,
617 chk,
618 1,
619 SCTP_SO_NOT_LOCKED);
620 cnt_abandoned++;
621 }
622 continue;
623 }
624 }
625 if (stcb->asoc.prsctp_supported && PR_SCTP_RTX_ENABLED(chk->flags)) {
626 /* Has it been retransmitted tv_sec times? */
627 if (chk->snd_count > chk->rec.data.timetodrop.tv_sec) {
628 if (chk->data) {
629 (void)sctp_release_pr_sctp_chunk(stcb,
630 chk,
631 1,
632 SCTP_SO_NOT_LOCKED);
633 cnt_abandoned++;
634 }
635 continue;
636 }
637 }
638 if (chk->sent < SCTP_DATAGRAM_RESEND) {
639 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
640 num_mk++;
641 if (fir == 0) {
642 fir = 1;
643 tsnfirst = chk->rec.data.tsn;
644 }
645 tsnlast = chk->rec.data.tsn;
646 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
647 sctp_log_fr(chk->rec.data.tsn, chk->snd_count,
648 0, SCTP_FR_T3_MARKED);
649 }
650 if (chk->rec.data.chunk_was_revoked) {
651 /* deflate the cwnd */
652 chk->whoTo->cwnd -= chk->book_size;
653 chk->rec.data.chunk_was_revoked = 0;
654 }
655 net->marked_retrans++;
656 stcb->asoc.marked_retrans++;
657 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
658 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_RSND_TO,
659 chk->whoTo->flight_size,
660 chk->book_size,
661 (uint32_t)(uintptr_t)chk->whoTo,
662 chk->rec.data.tsn);
663 }
664 sctp_flight_size_decrease(chk);
665 sctp_total_flight_decrease(stcb, chk);
666 stcb->asoc.peers_rwnd += chk->send_size;
667 stcb->asoc.peers_rwnd += SCTP_BASE_SYSCTL(sctp_peer_chunk_oh);
668 }
669 chk->sent = SCTP_DATAGRAM_RESEND;
670 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
671 SCTP_STAT_INCR(sctps_markedretrans);
672
673 /* reset the TSN for striking and other FR stuff */
674 chk->rec.data.doing_fast_retransmit = 0;
675 /* Clear any time so NO RTT is being done */
676
677 if (chk->do_rtt) {
678 if (chk->whoTo->rto_needed == 0) {
679 chk->whoTo->rto_needed = 1;
680 }
681 }
682 chk->do_rtt = 0;
683 if (alt != net) {
684 sctp_free_remote_addr(chk->whoTo);
685 chk->no_fr_allowed = 1;
686 chk->whoTo = alt;
687 atomic_add_int(&alt->ref_count, 1);
688 } else {
689 chk->no_fr_allowed = 0;
690 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
691 chk->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
692 } else {
693 chk->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn;
694 }
695 }
696 /*
697 * CMT: Do not allow FRs on retransmitted TSNs.
698 */
699 if (stcb->asoc.sctp_cmt_on_off > 0) {
700 chk->no_fr_allowed = 1;
701 }
702 #ifdef THIS_SHOULD_NOT_BE_DONE
703 } else if (chk->sent == SCTP_DATAGRAM_ACKED) {
704 /* remember highest acked one */
705 could_be_sent = chk;
706 #endif
707 }
708 if (chk->sent == SCTP_DATAGRAM_RESEND) {
709 cnt_mk++;
710 }
711 }
712 if ((orig_flight - net->flight_size) != (orig_tf - stcb->asoc.total_flight)) {
713 /* we did not subtract the same things? */
714 audit_tf = 1;
715 }
716 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
717 sctp_log_fr(tsnfirst, tsnlast, num_mk, SCTP_FR_T3_TIMEOUT);
718 }
719 #ifdef SCTP_DEBUG
720 if (num_mk) {
721 SCTPDBG(SCTP_DEBUG_TIMER1, "LAST TSN marked was %x\n",
722 tsnlast);
723 SCTPDBG(SCTP_DEBUG_TIMER1, "Num marked for retransmission was %d peer-rwd:%u\n",
724 num_mk,
725 stcb->asoc.peers_rwnd);
726 }
727 #endif
728 *num_marked = num_mk;
729 *num_abandoned = cnt_abandoned;
730 /*
731 * Now check for a ECN Echo that may be stranded And include the
732 * cnt_mk'd to have all resends in the control queue.
733 */
734 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
735 if (chk->sent == SCTP_DATAGRAM_RESEND) {
736 cnt_mk++;
737 }
738 if ((chk->whoTo == net) &&
739 (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
740 sctp_free_remote_addr(chk->whoTo);
741 chk->whoTo = alt;
742 if (chk->sent != SCTP_DATAGRAM_RESEND) {
743 chk->sent = SCTP_DATAGRAM_RESEND;
744 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
745 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
746 cnt_mk++;
747 }
748 atomic_add_int(&alt->ref_count, 1);
749 }
750 }
751 #ifdef THIS_SHOULD_NOT_BE_DONE
752 if ((stcb->asoc.sent_queue_retran_cnt == 0) && (could_be_sent)) {
753 /* fix it so we retransmit the highest acked anyway */
754 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
755 cnt_mk++;
756 could_be_sent->sent = SCTP_DATAGRAM_RESEND;
757 }
758 #endif
759 if (stcb->asoc.sent_queue_retran_cnt != cnt_mk) {
760 #ifdef INVARIANTS
761 SCTP_PRINTF("Local Audit says there are %d for retran asoc cnt:%d we marked:%d this time\n",
762 cnt_mk, stcb->asoc.sent_queue_retran_cnt, num_mk);
763 #endif
764 #ifndef SCTP_AUDITING_ENABLED
765 stcb->asoc.sent_queue_retran_cnt = cnt_mk;
766 #endif
767 }
768 if (audit_tf) {
769 SCTPDBG(SCTP_DEBUG_TIMER4,
770 "Audit total flight due to negative value net:%p\n",
771 (void *)net);
772 stcb->asoc.total_flight = 0;
773 stcb->asoc.total_flight_count = 0;
774 /* Clear all networks flight size */
775 TAILQ_FOREACH(lnets, &stcb->asoc.nets, sctp_next) {
776 lnets->flight_size = 0;
777 SCTPDBG(SCTP_DEBUG_TIMER4,
778 "Net:%p c-f cwnd:%d ssthresh:%d\n",
779 (void *)lnets, lnets->cwnd, lnets->ssthresh);
780 }
781 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
782 if (chk->sent < SCTP_DATAGRAM_RESEND) {
783 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
784 sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
785 chk->whoTo->flight_size,
786 chk->book_size,
787 (uint32_t)(uintptr_t)chk->whoTo,
788 chk->rec.data.tsn);
789 }
790 sctp_flight_size_increase(chk);
791 sctp_total_flight_increase(stcb, chk);
792 }
793 }
794 }
795 /* We return 1 if we only have a window probe outstanding */
796 return (0);
797 }
798
799
800 int
801 sctp_t3rxt_timer(struct sctp_inpcb *inp,
802 struct sctp_tcb *stcb,
803 struct sctp_nets *net)
804 {
805 struct sctp_nets *alt;
806 int win_probe, num_mk, num_abandoned;
807
808 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
809 sctp_log_fr(0, 0, 0, SCTP_FR_T3_TIMEOUT);
810 }
811 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
812 struct sctp_nets *lnet;
813
814 TAILQ_FOREACH(lnet, &stcb->asoc.nets, sctp_next) {
815 if (net == lnet) {
816 sctp_log_cwnd(stcb, lnet, 1, SCTP_CWND_LOG_FROM_T3);
817 } else {
818 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_LOG_FROM_T3);
819 }
820 }
821 }
822 /* Find an alternate and mark those for retransmission */
823 if ((stcb->asoc.peers_rwnd == 0) &&
824 (stcb->asoc.total_flight < net->mtu)) {
825 SCTP_STAT_INCR(sctps_timowindowprobe);
826 win_probe = 1;
827 } else {
828 win_probe = 0;
829 }
830
831 if (win_probe == 0) {
832 /* We don't do normal threshold management on window probes */
833 if (sctp_threshold_management(inp, stcb, net,
834 stcb->asoc.max_send_times)) {
835 /* Association was destroyed */
836 return (1);
837 } else {
838 if (net != stcb->asoc.primary_destination) {
839 /* send a immediate HB if our RTO is stale */
840 struct timeval now;
841 unsigned int ms_goneby;
842
843 (void)SCTP_GETTIME_TIMEVAL(&now);
844 if (net->last_sent_time.tv_sec) {
845 ms_goneby = (now.tv_sec - net->last_sent_time.tv_sec) * 1000;
846 } else {
847 ms_goneby = 0;
848 }
849 if ((net->dest_state & SCTP_ADDR_PF) == 0) {
850 if ((ms_goneby > net->RTO) || (net->RTO == 0)) {
851 /*
852 * no recent feed back in an
853 * RTO or more, request a
854 * RTT update
855 */
856 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
857 }
858 }
859 }
860 }
861 } else {
862 /*
863 * For a window probe we don't penalize the net's but only
864 * the association. This may fail it if SACKs are not coming
865 * back. If sack's are coming with rwnd locked at 0, we will
866 * continue to hold things waiting for rwnd to raise
867 */
868 if (sctp_threshold_management(inp, stcb, NULL,
869 stcb->asoc.max_send_times)) {
870 /* Association was destroyed */
871 return (1);
872 }
873 }
874 if (stcb->asoc.sctp_cmt_on_off > 0) {
875 if (net->pf_threshold < net->failure_threshold) {
876 alt = sctp_find_alternate_net(stcb, net, 2);
877 } else {
878 /*
879 * CMT: Using RTX_SSTHRESH policy for CMT. If CMT is
880 * being used, then pick dest with largest ssthresh
881 * for any retransmission.
882 */
883 alt = sctp_find_alternate_net(stcb, net, 1);
884 /*
885 * CUCv2: If a different dest is picked for the
886 * retransmission, then new (rtx-)pseudo_cumack
887 * needs to be tracked for orig dest. Let CUCv2
888 * track new (rtx-) pseudo-cumack always.
889 */
890 net->find_pseudo_cumack = 1;
891 net->find_rtx_pseudo_cumack = 1;
892 }
893 } else {
894 alt = sctp_find_alternate_net(stcb, net, 0);
895 }
896
897 num_mk = 0;
898 num_abandoned = 0;
899 (void)sctp_mark_all_for_resend(stcb, net, alt, win_probe,
900 &num_mk, &num_abandoned);
901 /* FR Loss recovery just ended with the T3. */
902 stcb->asoc.fast_retran_loss_recovery = 0;
903
904 /* CMT FR loss recovery ended with the T3 */
905 net->fast_retran_loss_recovery = 0;
906 if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
907 (net->flight_size == 0)) {
908 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
909 }
910 /*
911 * setup the sat loss recovery that prevents satellite cwnd advance.
912 */
913 stcb->asoc.sat_t3_loss_recovery = 1;
914 stcb->asoc.sat_t3_recovery_tsn = stcb->asoc.sending_seq;
915
916 /* Backoff the timer and cwnd */
917 sctp_backoff_on_timeout(stcb, net, win_probe, num_mk, num_abandoned);
918 if ((!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
919 (net->dest_state & SCTP_ADDR_PF)) {
920 /* Move all pending over too */
921 sctp_move_chunks_from_net(stcb, net);
922
923 /*
924 * Get the address that failed, to force a new src address
925 * selecton and a route allocation.
926 */
927 if (net->ro._s_addr) {
928 sctp_free_ifa(net->ro._s_addr);
929 net->ro._s_addr = NULL;
930 }
931 net->src_addr_selected = 0;
932
933 /* Force a route allocation too */
934 if (net->ro.ro_rt) {
935 RTFREE(net->ro.ro_rt);
936 net->ro.ro_rt = NULL;
937 }
938 /* Was it our primary? */
939 if ((stcb->asoc.primary_destination == net) && (alt != net)) {
940 /*
941 * Yes, note it as such and find an alternate note:
942 * this means HB code must use this to resent the
943 * primary if it goes active AND if someone does a
944 * change-primary then this flag must be cleared
945 * from any net structures.
946 */
947 if (stcb->asoc.alternate) {
948 sctp_free_remote_addr(stcb->asoc.alternate);
949 }
950 stcb->asoc.alternate = alt;
951 atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
952 }
953 }
954 /*
955 * Special case for cookie-echo'ed case, we don't do output but must
956 * await the COOKIE-ACK before retransmission
957 */
958 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
959 /*
960 * Here we just reset the timer and start again since we
961 * have not established the asoc
962 */
963 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
964 return (0);
965 }
966 if (stcb->asoc.prsctp_supported) {
967 struct sctp_tmit_chunk *lchk;
968
969 lchk = sctp_try_advance_peer_ack_point(stcb, &stcb->asoc);
970 /* C3. See if we need to send a Fwd-TSN */
971 if (SCTP_TSN_GT(stcb->asoc.advanced_peer_ack_point, stcb->asoc.last_acked_seq)) {
972 send_forward_tsn(stcb, &stcb->asoc);
973 if (lchk) {
974 /* Assure a timer is up */
975 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, lchk->whoTo);
976 }
977 }
978 }
979 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
980 sctp_log_cwnd(stcb, net, net->cwnd, SCTP_CWND_LOG_FROM_RTX);
981 }
982 return (0);
983 }
984
985 int
986 sctp_t1init_timer(struct sctp_inpcb *inp,
987 struct sctp_tcb *stcb,
988 struct sctp_nets *net)
989 {
990 /* bump the thresholds */
991 if (stcb->asoc.delayed_connection) {
992 /*
993 * special hook for delayed connection. The library did NOT
994 * complete the rest of its sends.
995 */
996 stcb->asoc.delayed_connection = 0;
997 sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
998 return (0);
999 }
1000 if (SCTP_GET_STATE((&stcb->asoc)) != SCTP_STATE_COOKIE_WAIT) {
1001 return (0);
1002 }
1003 if (sctp_threshold_management(inp, stcb, net,
1004 stcb->asoc.max_init_times)) {
1005 /* Association was destroyed */
1006 return (1);
1007 }
1008 stcb->asoc.dropped_special_cnt = 0;
1009 sctp_backoff_on_timeout(stcb, stcb->asoc.primary_destination, 1, 0, 0);
1010 if (stcb->asoc.initial_init_rto_max < net->RTO) {
1011 net->RTO = stcb->asoc.initial_init_rto_max;
1012 }
1013 if (stcb->asoc.numnets > 1) {
1014 /* If we have more than one addr use it */
1015 struct sctp_nets *alt;
1016
1017 alt = sctp_find_alternate_net(stcb, stcb->asoc.primary_destination, 0);
1018 if (alt != stcb->asoc.primary_destination) {
1019 sctp_move_chunks_from_net(stcb, stcb->asoc.primary_destination);
1020 stcb->asoc.primary_destination = alt;
1021 }
1022 }
1023 /* Send out a new init */
1024 sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
1025 return (0);
1026 }
1027
1028 /*
1029 * For cookie and asconf we actually need to find and mark for resend, then
1030 * increment the resend counter (after all the threshold management stuff of
1031 * course).
1032 */
1033 int
1034 sctp_cookie_timer(struct sctp_inpcb *inp,
1035 struct sctp_tcb *stcb,
1036 struct sctp_nets *net SCTP_UNUSED)
1037 {
1038 struct sctp_nets *alt;
1039 struct sctp_tmit_chunk *cookie;
1040
1041 /* first before all else we must find the cookie */
1042 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, sctp_next) {
1043 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
1044 break;
1045 }
1046 }
1047 if (cookie == NULL) {
1048 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
1049 /* FOOBAR! */
1050 struct mbuf *op_err;
1051
1052 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
1053 "Cookie timer expired, but no cookie");
1054 inp->last_abort_code = SCTP_FROM_SCTP_TIMER + SCTP_LOC_3;
1055 sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED);
1056 } else {
1057 #ifdef INVARIANTS
1058 panic("Cookie timer expires in wrong state?");
1059 #else
1060 SCTP_PRINTF("Strange in state %d not cookie-echoed yet c-e timer expires?\n", SCTP_GET_STATE(&stcb->asoc));
1061 return (0);
1062 #endif
1063 }
1064 return (0);
1065 }
1066 /* Ok we found the cookie, threshold management next */
1067 if (sctp_threshold_management(inp, stcb, cookie->whoTo,
1068 stcb->asoc.max_init_times)) {
1069 /* Assoc is over */
1070 return (1);
1071 }
1072 /*
1073 * Cleared threshold management, now lets backoff the address and
1074 * select an alternate
1075 */
1076 stcb->asoc.dropped_special_cnt = 0;
1077 sctp_backoff_on_timeout(stcb, cookie->whoTo, 1, 0, 0);
1078 alt = sctp_find_alternate_net(stcb, cookie->whoTo, 0);
1079 if (alt != cookie->whoTo) {
1080 sctp_free_remote_addr(cookie->whoTo);
1081 cookie->whoTo = alt;
1082 atomic_add_int(&alt->ref_count, 1);
1083 }
1084 /* Now mark the retran info */
1085 if (cookie->sent != SCTP_DATAGRAM_RESEND) {
1086 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1087 }
1088 cookie->sent = SCTP_DATAGRAM_RESEND;
1089 cookie->flags |= CHUNK_FLAGS_FRAGMENT_OK;
1090 /*
1091 * Now call the output routine to kick out the cookie again, Note we
1092 * don't mark any chunks for retran so that FR will need to kick in
1093 * to move these (or a send timer).
1094 */
1095 return (0);
1096 }
1097
1098 int
1099 sctp_strreset_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1100 struct sctp_nets *net)
1101 {
1102 struct sctp_nets *alt;
1103 struct sctp_tmit_chunk *strrst = NULL, *chk = NULL;
1104
1105 if (stcb->asoc.stream_reset_outstanding == 0) {
1106 return (0);
1107 }
1108 /* find the existing STRRESET, we use the seq number we sent out on */
1109 (void)sctp_find_stream_reset(stcb, stcb->asoc.str_reset_seq_out, &strrst);
1110 if (strrst == NULL) {
1111 return (0);
1112 }
1113 /* do threshold management */
1114 if (sctp_threshold_management(inp, stcb, strrst->whoTo,
1115 stcb->asoc.max_send_times)) {
1116 /* Assoc is over */
1117 return (1);
1118 }
1119 /*
1120 * Cleared threshold management, now lets backoff the address and
1121 * select an alternate
1122 */
1123 sctp_backoff_on_timeout(stcb, strrst->whoTo, 1, 0, 0);
1124 alt = sctp_find_alternate_net(stcb, strrst->whoTo, 0);
1125 sctp_free_remote_addr(strrst->whoTo);
1126 strrst->whoTo = alt;
1127 atomic_add_int(&alt->ref_count, 1);
1128
1129 /* See if a ECN Echo is also stranded */
1130 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
1131 if ((chk->whoTo == net) &&
1132 (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
1133 sctp_free_remote_addr(chk->whoTo);
1134 if (chk->sent != SCTP_DATAGRAM_RESEND) {
1135 chk->sent = SCTP_DATAGRAM_RESEND;
1136 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
1137 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1138 }
1139 chk->whoTo = alt;
1140 atomic_add_int(&alt->ref_count, 1);
1141 }
1142 }
1143 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
1144 /*
1145 * If the address went un-reachable, we need to move to
1146 * alternates for ALL chk's in queue
1147 */
1148 sctp_move_chunks_from_net(stcb, net);
1149 }
1150 /* mark the retran info */
1151 if (strrst->sent != SCTP_DATAGRAM_RESEND)
1152 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1153 strrst->sent = SCTP_DATAGRAM_RESEND;
1154 strrst->flags |= CHUNK_FLAGS_FRAGMENT_OK;
1155
1156 /* restart the timer */
1157 sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, inp, stcb, strrst->whoTo);
1158 return (0);
1159 }
1160
1161 int
1162 sctp_asconf_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1163 struct sctp_nets *net)
1164 {
1165 struct sctp_nets *alt;
1166 struct sctp_tmit_chunk *asconf, *chk;
1167
1168 /* is this a first send, or a retransmission? */
1169 if (TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) {
1170 /* compose a new ASCONF chunk and send it */
1171 sctp_send_asconf(stcb, net, SCTP_ADDR_NOT_LOCKED);
1172 } else {
1173 /*
1174 * Retransmission of the existing ASCONF is needed
1175 */
1176
1177 /* find the existing ASCONF */
1178 asconf = TAILQ_FIRST(&stcb->asoc.asconf_send_queue);
1179 if (asconf == NULL) {
1180 return (0);
1181 }
1182 /* do threshold management */
1183 if (sctp_threshold_management(inp, stcb, asconf->whoTo,
1184 stcb->asoc.max_send_times)) {
1185 /* Assoc is over */
1186 return (1);
1187 }
1188 if (asconf->snd_count > stcb->asoc.max_send_times) {
1189 /*
1190 * Something is rotten: our peer is not responding
1191 * to ASCONFs but apparently is to other chunks.
1192 * i.e. it is not properly handling the chunk type
1193 * upper bits. Mark this peer as ASCONF incapable
1194 * and cleanup.
1195 */
1196 SCTPDBG(SCTP_DEBUG_TIMER1, "asconf_timer: Peer has not responded to our repeated ASCONFs\n");
1197 sctp_asconf_cleanup(stcb, net);
1198 return (0);
1199 }
1200 /*
1201 * cleared threshold management, so now backoff the net and
1202 * select an alternate
1203 */
1204 sctp_backoff_on_timeout(stcb, asconf->whoTo, 1, 0, 0);
1205 alt = sctp_find_alternate_net(stcb, asconf->whoTo, 0);
1206 if (asconf->whoTo != alt) {
1207 sctp_free_remote_addr(asconf->whoTo);
1208 asconf->whoTo = alt;
1209 atomic_add_int(&alt->ref_count, 1);
1210 }
1211 /* See if an ECN Echo is also stranded */
1212 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
1213 if ((chk->whoTo == net) &&
1214 (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
1215 sctp_free_remote_addr(chk->whoTo);
1216 chk->whoTo = alt;
1217 if (chk->sent != SCTP_DATAGRAM_RESEND) {
1218 chk->sent = SCTP_DATAGRAM_RESEND;
1219 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
1220 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1221 }
1222 atomic_add_int(&alt->ref_count, 1);
1223 }
1224 }
1225 TAILQ_FOREACH(chk, &stcb->asoc.asconf_send_queue, sctp_next) {
1226 if (chk->whoTo != alt) {
1227 sctp_free_remote_addr(chk->whoTo);
1228 chk->whoTo = alt;
1229 atomic_add_int(&alt->ref_count, 1);
1230 }
1231 if (asconf->sent != SCTP_DATAGRAM_RESEND && chk->sent != SCTP_DATAGRAM_UNSENT)
1232 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1233 chk->sent = SCTP_DATAGRAM_RESEND;
1234 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
1235 }
1236 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
1237 /*
1238 * If the address went un-reachable, we need to move
1239 * to the alternate for ALL chunks in queue
1240 */
1241 sctp_move_chunks_from_net(stcb, net);
1242 }
1243 /* mark the retran info */
1244 if (asconf->sent != SCTP_DATAGRAM_RESEND)
1245 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1246 asconf->sent = SCTP_DATAGRAM_RESEND;
1247 asconf->flags |= CHUNK_FLAGS_FRAGMENT_OK;
1248
1249 /* send another ASCONF if any and we can do */
1250 sctp_send_asconf(stcb, alt, SCTP_ADDR_NOT_LOCKED);
1251 }
1252 return (0);
1253 }
1254
1255 /* Mobility adaptation */
1256 void
1257 sctp_delete_prim_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1258 struct sctp_nets *net SCTP_UNUSED)
1259 {
1260 if (stcb->asoc.deleted_primary == NULL) {
1261 SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: deleted_primary is not stored...\n");
1262 sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
1263 return;
1264 }
1265 SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: finished to keep deleted primary ");
1266 SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, &stcb->asoc.deleted_primary->ro._l_addr.sa);
1267 sctp_free_remote_addr(stcb->asoc.deleted_primary);
1268 stcb->asoc.deleted_primary = NULL;
1269 sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
1270 return;
1271 }
1272
1273 /*
1274 * For the shutdown and shutdown-ack, we do not keep one around on the
1275 * control queue. This means we must generate a new one and call the general
1276 * chunk output routine, AFTER having done threshold management.
1277 * It is assumed that net is non-NULL.
1278 */
1279 int
1280 sctp_shutdown_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1281 struct sctp_nets *net)
1282 {
1283 struct sctp_nets *alt;
1284
1285 /* first threshold management */
1286 if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
1287 /* Assoc is over */
1288 return (1);
1289 }
1290 sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
1291 /* second select an alternative */
1292 alt = sctp_find_alternate_net(stcb, net, 0);
1293
1294 /* third generate a shutdown into the queue for out net */
1295 sctp_send_shutdown(stcb, alt);
1296
1297 /* fourth restart timer */
1298 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, inp, stcb, alt);
1299 return (0);
1300 }
1301
1302 int
1303 sctp_shutdownack_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1304 struct sctp_nets *net)
1305 {
1306 struct sctp_nets *alt;
1307
1308 /* first threshold management */
1309 if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
1310 /* Assoc is over */
1311 return (1);
1312 }
1313 sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
1314 /* second select an alternative */
1315 alt = sctp_find_alternate_net(stcb, net, 0);
1316
1317 /* third generate a shutdown into the queue for out net */
1318 sctp_send_shutdown_ack(stcb, alt);
1319
1320 /* fourth restart timer */
1321 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, inp, stcb, alt);
1322 return (0);
1323 }
1324
1325 static void
1326 sctp_audit_stream_queues_for_size(struct sctp_inpcb *inp,
1327 struct sctp_tcb *stcb)
1328 {
1329 struct sctp_stream_queue_pending *sp;
1330 unsigned int i, chks_in_queue = 0;
1331 int being_filled = 0;
1332
1333 /*
1334 * This function is ONLY called when the send/sent queues are empty.
1335 */
1336 if ((stcb == NULL) || (inp == NULL))
1337 return;
1338
1339 if (stcb->asoc.sent_queue_retran_cnt) {
1340 SCTP_PRINTF("Hmm, sent_queue_retran_cnt is non-zero %d\n",
1341 stcb->asoc.sent_queue_retran_cnt);
1342 stcb->asoc.sent_queue_retran_cnt = 0;
1343 }
1344 if (stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
1345 /* No stream scheduler information, initialize scheduler */
1346 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 0);
1347 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
1348 /* yep, we lost a stream or two */
1349 SCTP_PRINTF("Found additional streams NOT managed by scheduler, corrected\n");
1350 } else {
1351 /* no streams lost */
1352 stcb->asoc.total_output_queue_size = 0;
1353 }
1354 }
1355 /* Check to see if some data queued, if so report it */
1356 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1357 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
1358 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
1359 if (sp->msg_is_complete)
1360 being_filled++;
1361 chks_in_queue++;
1362 }
1363 }
1364 }
1365 if (chks_in_queue != stcb->asoc.stream_queue_cnt) {
1366 SCTP_PRINTF("Hmm, stream queue cnt at %d I counted %d in stream out wheel\n",
1367 stcb->asoc.stream_queue_cnt, chks_in_queue);
1368 }
1369 if (chks_in_queue) {
1370 /* call the output queue function */
1371 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_T3, SCTP_SO_NOT_LOCKED);
1372 if ((TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
1373 (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
1374 /*
1375 * Probably should go in and make it go back through
1376 * and add fragments allowed
1377 */
1378 if (being_filled == 0) {
1379 SCTP_PRINTF("Still nothing moved %d chunks are stuck\n",
1380 chks_in_queue);
1381 }
1382 }
1383 } else {
1384 SCTP_PRINTF("Found no chunks on any queue tot:%lu\n",
1385 (u_long)stcb->asoc.total_output_queue_size);
1386 stcb->asoc.total_output_queue_size = 0;
1387 }
1388 }
1389
1390 int
1391 sctp_heartbeat_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1392 struct sctp_nets *net)
1393 {
1394 uint8_t net_was_pf;
1395
1396 if (net->dest_state & SCTP_ADDR_PF) {
1397 net_was_pf = 1;
1398 } else {
1399 net_was_pf = 0;
1400 }
1401 if (net->hb_responded == 0) {
1402 if (net->ro._s_addr) {
1403 /*
1404 * Invalidate the src address if we did not get a
1405 * response last time.
1406 */
1407 sctp_free_ifa(net->ro._s_addr);
1408 net->ro._s_addr = NULL;
1409 net->src_addr_selected = 0;
1410 }
1411 sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
1412 if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
1413 /* Assoc is over */
1414 return (1);
1415 }
1416 }
1417 /* Zero PBA, if it needs it */
1418 if (net->partial_bytes_acked) {
1419 net->partial_bytes_acked = 0;
1420 }
1421 if ((stcb->asoc.total_output_queue_size > 0) &&
1422 (TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
1423 (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
1424 sctp_audit_stream_queues_for_size(inp, stcb);
1425 }
1426 if (!(net->dest_state & SCTP_ADDR_NOHB) &&
1427 !((net_was_pf == 0) && (net->dest_state & SCTP_ADDR_PF))) {
1428 /*
1429 * when move to PF during threshold mangement, a HB has been
1430 * queued in that routine
1431 */
1432 uint32_t ms_gone_by;
1433
1434 if ((net->last_sent_time.tv_sec > 0) ||
1435 (net->last_sent_time.tv_usec > 0)) {
1436 struct timeval diff;
1437
1438 SCTP_GETTIME_TIMEVAL(&diff);
1439 timevalsub(&diff, &net->last_sent_time);
1440 ms_gone_by = (uint32_t)(diff.tv_sec * 1000) +
1441 (uint32_t)(diff.tv_usec / 1000);
1442 } else {
1443 ms_gone_by = 0xffffffff;
1444 }
1445 if ((ms_gone_by >= net->heart_beat_delay) ||
1446 (net->dest_state & SCTP_ADDR_PF)) {
1447 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
1448 }
1449 }
1450 return (0);
1451 }
1452
1453 void
1454 sctp_pathmtu_timer(struct sctp_inpcb *inp,
1455 struct sctp_tcb *stcb,
1456 struct sctp_nets *net)
1457 {
1458 uint32_t next_mtu, mtu;
1459
1460 next_mtu = sctp_get_next_mtu(net->mtu);
1461
1462 if ((next_mtu > net->mtu) && (net->port == 0)) {
1463 if ((net->src_addr_selected == 0) ||
1464 (net->ro._s_addr == NULL) ||
1465 (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
1466 if ((net->ro._s_addr != NULL) && (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
1467 sctp_free_ifa(net->ro._s_addr);
1468 net->ro._s_addr = NULL;
1469 net->src_addr_selected = 0;
1470 } else if (net->ro._s_addr == NULL) {
1471 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
1472 if (net->ro._l_addr.sa.sa_family == AF_INET6) {
1473 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1474
1475 /* KAME hack: embed scopeid */
1476 (void)sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
1477 }
1478 #endif
1479
1480 net->ro._s_addr = sctp_source_address_selection(inp,
1481 stcb,
1482 (sctp_route_t *)&net->ro,
1483 net, 0, stcb->asoc.vrf_id);
1484 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
1485 if (net->ro._l_addr.sa.sa_family == AF_INET6) {
1486 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1487
1488 (void)sa6_recoverscope(sin6);
1489 }
1490 #endif /* INET6 */
1491 }
1492 if (net->ro._s_addr)
1493 net->src_addr_selected = 1;
1494 }
1495 if (net->ro._s_addr) {
1496 mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._s_addr.sa, net->ro.ro_rt);
1497 #if defined(INET) || defined(INET6)
1498 if (net->port) {
1499 mtu -= sizeof(struct udphdr);
1500 }
1501 #endif
1502 if (mtu > next_mtu) {
1503 net->mtu = next_mtu;
1504 } else {
1505 net->mtu = mtu;
1506 }
1507 }
1508 }
1509 /* restart the timer */
1510 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net);
1511 }
1512
1513 void
1514 sctp_autoclose_timer(struct sctp_inpcb *inp,
1515 struct sctp_tcb *stcb,
1516 struct sctp_nets *net)
1517 {
1518 struct timeval tn, *tim_touse;
1519 struct sctp_association *asoc;
1520 int ticks_gone_by;
1521
1522 (void)SCTP_GETTIME_TIMEVAL(&tn);
1523 if (stcb->asoc.sctp_autoclose_ticks &&
1524 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1525 /* Auto close is on */
1526 asoc = &stcb->asoc;
1527 /* pick the time to use */
1528 if (asoc->time_last_rcvd.tv_sec >
1529 asoc->time_last_sent.tv_sec) {
1530 tim_touse = &asoc->time_last_rcvd;
1531 } else {
1532 tim_touse = &asoc->time_last_sent;
1533 }
1534 /* Now has long enough transpired to autoclose? */
1535 ticks_gone_by = SEC_TO_TICKS(tn.tv_sec - tim_touse->tv_sec);
1536 if ((ticks_gone_by > 0) &&
1537 (ticks_gone_by >= (int)asoc->sctp_autoclose_ticks)) {
1538 /*
1539 * autoclose time has hit, call the output routine,
1540 * which should do nothing just to be SURE we don't
1541 * have hanging data. We can then safely check the
1542 * queues and know that we are clear to send
1543 * shutdown
1544 */
1545 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_AUTOCLOSE_TMR, SCTP_SO_NOT_LOCKED);
1546 /* Are we clean? */
1547 if (TAILQ_EMPTY(&asoc->send_queue) &&
1548 TAILQ_EMPTY(&asoc->sent_queue)) {
1549 /*
1550 * there is nothing queued to send, so I'm
1551 * done...
1552 */
1553 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
1554 /* only send SHUTDOWN 1st time thru */
1555 struct sctp_nets *netp;
1556
1557 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
1558 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
1559 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
1560 }
1561 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
1562 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
1563 sctp_stop_timers_for_shutdown(stcb);
1564 if (stcb->asoc.alternate) {
1565 netp = stcb->asoc.alternate;
1566 } else {
1567 netp = stcb->asoc.primary_destination;
1568 }
1569 sctp_send_shutdown(stcb, netp);
1570 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
1571 stcb->sctp_ep, stcb,
1572 netp);
1573 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1574 stcb->sctp_ep, stcb,
1575 netp);
1576 }
1577 }
1578 } else {
1579 /*
1580 * No auto close at this time, reset t-o to check
1581 * later
1582 */
1583 int tmp;
1584
1585 /* fool the timer startup to use the time left */
1586 tmp = asoc->sctp_autoclose_ticks;
1587 asoc->sctp_autoclose_ticks -= ticks_gone_by;
1588 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1589 net);
1590 /* restore the real tick value */
1591 asoc->sctp_autoclose_ticks = tmp;
1592 }
1593 }
1594 }
Cache object: 3e5ab286e14d7cfea6e8acef91a41930
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