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netwerk/sctp/src/netinet/sctp_timer.c

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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 #ifdef __FreeBSD__
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD: head/sys/netinet/sctp_timer.c 257359 2013-10-29 20:04:50Z tuexen $");
36 #endif
37
38 #define _IP_VHL
39 #include <netinet/sctp_os.h>
40 #include <netinet/sctp_pcb.h>
41 #ifdef INET6
42 #if defined(__Userspace_os_FreeBSD)
43 #include <netinet6/sctp6_var.h>
44 #endif
45 #endif
46 #include <netinet/sctp_var.h>
47 #include <netinet/sctp_sysctl.h>
48 #include <netinet/sctp_timer.h>
49 #include <netinet/sctputil.h>
50 #include <netinet/sctp_output.h>
51 #include <netinet/sctp_header.h>
52 #include <netinet/sctp_indata.h>
53 #include <netinet/sctp_asconf.h>
54 #include <netinet/sctp_input.h>
55 #include <netinet/sctp.h>
56 #include <netinet/sctp_uio.h>
57 #if !defined(__Userspace_os_Windows)
58 #include <netinet/udp.h>
59 #endif
60
61 #if defined(__APPLE__)
62 #define APPLE_FILE_NO 6
63 #endif
64
65 void
66 sctp_audit_retranmission_queue(struct sctp_association *asoc)
67 {
68 struct sctp_tmit_chunk *chk;
69
70 SCTPDBG(SCTP_DEBUG_TIMER4, "Audit invoked on send queue cnt:%d onqueue:%d\n",
71 asoc->sent_queue_retran_cnt,
72 asoc->sent_queue_cnt);
73 asoc->sent_queue_retran_cnt = 0;
74 asoc->sent_queue_cnt = 0;
75 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
76 if (chk->sent == SCTP_DATAGRAM_RESEND) {
77 sctp_ucount_incr(asoc->sent_queue_retran_cnt);
78 }
79 asoc->sent_queue_cnt++;
80 }
81 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
82 if (chk->sent == SCTP_DATAGRAM_RESEND) {
83 sctp_ucount_incr(asoc->sent_queue_retran_cnt);
84 }
85 }
86 TAILQ_FOREACH(chk, &asoc->asconf_send_queue, sctp_next) {
87 if (chk->sent == SCTP_DATAGRAM_RESEND) {
88 sctp_ucount_incr(asoc->sent_queue_retran_cnt);
89 }
90 }
91 SCTPDBG(SCTP_DEBUG_TIMER4, "Audit completes retran:%d onqueue:%d\n",
92 asoc->sent_queue_retran_cnt,
93 asoc->sent_queue_cnt);
94 }
95
96 int
97 sctp_threshold_management(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
98 struct sctp_nets *net, uint16_t threshold)
99 {
100 if (net) {
101 net->error_count++;
102 SCTPDBG(SCTP_DEBUG_TIMER4, "Error count for %p now %d thresh:%d\n",
103 (void *)net, net->error_count,
104 net->failure_threshold);
105 if (net->error_count > net->failure_threshold) {
106 /* We had a threshold failure */
107 if (net->dest_state & SCTP_ADDR_REACHABLE) {
108 net->dest_state &= ~SCTP_ADDR_REACHABLE;
109 net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
110 net->dest_state &= ~SCTP_ADDR_PF;
111 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
112 stcb, 0,
113 (void *)net, SCTP_SO_NOT_LOCKED);
114 }
115 } else if ((net->pf_threshold < net->failure_threshold) &&
116 (net->error_count > net->pf_threshold)) {
117 if (!(net->dest_state & SCTP_ADDR_PF)) {
118 net->dest_state |= SCTP_ADDR_PF;
119 net->last_active = sctp_get_tick_count();
120 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
121 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_TIMER + SCTP_LOC_3);
122 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
123 }
124 }
125 }
126 if (stcb == NULL)
127 return (0);
128
129 if (net) {
130 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0) {
131 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
132 sctp_misc_ints(SCTP_THRESHOLD_INCR,
133 stcb->asoc.overall_error_count,
134 (stcb->asoc.overall_error_count+1),
135 SCTP_FROM_SCTP_TIMER,
136 __LINE__);
137 }
138 stcb->asoc.overall_error_count++;
139 }
140 } else {
141 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
142 sctp_misc_ints(SCTP_THRESHOLD_INCR,
143 stcb->asoc.overall_error_count,
144 (stcb->asoc.overall_error_count+1),
145 SCTP_FROM_SCTP_TIMER,
146 __LINE__);
147 }
148 stcb->asoc.overall_error_count++;
149 }
150 SCTPDBG(SCTP_DEBUG_TIMER4, "Overall error count for %p now %d thresh:%u state:%x\n",
151 (void *)&stcb->asoc, stcb->asoc.overall_error_count,
152 (uint32_t)threshold,
153 ((net == NULL) ? (uint32_t) 0 : (uint32_t) net->dest_state));
154 /*
155 * We specifically do not do >= to give the assoc one more change
156 * before we fail it.
157 */
158 if (stcb->asoc.overall_error_count > threshold) {
159 /* Abort notification sends a ULP notify */
160 struct mbuf *oper;
161
162 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)),
163 0, M_NOWAIT, 1, MT_DATA);
164 if (oper) {
165 struct sctp_paramhdr *ph;
166 uint32_t *ippp;
167
168 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
169 sizeof(uint32_t);
170 ph = mtod(oper, struct sctp_paramhdr *);
171 ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
172 ph->param_length = htons(SCTP_BUF_LEN(oper));
173 ippp = (uint32_t *) (ph + 1);
174 *ippp = htonl(SCTP_FROM_SCTP_TIMER+SCTP_LOC_1);
175 }
176 inp->last_abort_code = SCTP_FROM_SCTP_TIMER+SCTP_LOC_1;
177 sctp_abort_an_association(inp, stcb, oper, SCTP_SO_NOT_LOCKED);
178 return (1);
179 }
180 return (0);
181 }
182
183 /*
184 * sctp_find_alternate_net() returns a non-NULL pointer as long
185 * the argument net is non-NULL.
186 */
187 struct sctp_nets *
188 sctp_find_alternate_net(struct sctp_tcb *stcb,
189 struct sctp_nets *net,
190 int mode)
191 {
192 /* Find and return an alternate network if possible */
193 struct sctp_nets *alt, *mnet, *min_errors_net = NULL , *max_cwnd_net = NULL;
194 int once;
195 /* JRS 5/14/07 - Initialize min_errors to an impossible value. */
196 int min_errors = -1;
197 uint32_t max_cwnd = 0;
198
199 if (stcb->asoc.numnets == 1) {
200 /* No others but net */
201 return (TAILQ_FIRST(&stcb->asoc.nets));
202 }
203 /*
204 * JRS 5/14/07 - If mode is set to 2, use the CMT PF find alternate net algorithm.
205 * This algorithm chooses the active destination (not in PF state) with the largest
206 * cwnd value. If all destinations are in PF state, unreachable, or unconfirmed, choose
207 * the desination that is in PF state with the lowest error count. In case of a tie,
208 * choose the destination that was most recently active.
209 */
210 if (mode == 2) {
211 TAILQ_FOREACH(mnet, &stcb->asoc.nets, sctp_next) {
212 /* JRS 5/14/07 - If the destination is unreachable or unconfirmed, skip it. */
213 if (((mnet->dest_state & SCTP_ADDR_REACHABLE) != SCTP_ADDR_REACHABLE) ||
214 (mnet->dest_state & SCTP_ADDR_UNCONFIRMED)) {
215 continue;
216 }
217 /*
218 * JRS 5/14/07 - If the destination is reachable but in PF state, compare
219 * the error count of the destination to the minimum error count seen thus far.
220 * Store the destination with the lower error count. If the error counts are
221 * equal, store the destination that was most recently active.
222 */
223 if (mnet->dest_state & SCTP_ADDR_PF) {
224 /*
225 * JRS 5/14/07 - If the destination under consideration is the current
226 * destination, work as if the error count is one higher. The
227 * actual error count will not be incremented until later in the
228 * t3 handler.
229 */
230 if (mnet == net) {
231 if (min_errors == -1) {
232 min_errors = mnet->error_count + 1;
233 min_errors_net = mnet;
234 } else if (mnet->error_count + 1 < min_errors) {
235 min_errors = mnet->error_count + 1;
236 min_errors_net = mnet;
237 } else if (mnet->error_count + 1 == min_errors
238 && mnet->last_active > min_errors_net->last_active) {
239 min_errors_net = mnet;
240 min_errors = mnet->error_count + 1;
241 }
242 continue;
243 } else {
244 if (min_errors == -1) {
245 min_errors = mnet->error_count;
246 min_errors_net = mnet;
247 } else if (mnet->error_count < min_errors) {
248 min_errors = mnet->error_count;
249 min_errors_net = mnet;
250 } else if (mnet->error_count == min_errors
251 && mnet->last_active > min_errors_net->last_active) {
252 min_errors_net = mnet;
253 min_errors = mnet->error_count;
254 }
255 continue;
256 }
257 }
258 /*
259 * JRS 5/14/07 - If the destination is reachable and not in PF state, compare the
260 * cwnd of the destination to the highest cwnd seen thus far. Store the
261 * destination with the higher cwnd value. If the cwnd values are equal,
262 * randomly choose one of the two destinations.
263 */
264 if (max_cwnd < mnet->cwnd) {
265 max_cwnd_net = mnet;
266 max_cwnd = mnet->cwnd;
267 } else if (max_cwnd == mnet->cwnd) {
268 uint32_t rndval;
269 uint8_t this_random;
270
271 if (stcb->asoc.hb_random_idx > 3) {
272 rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
273 memcpy(stcb->asoc.hb_random_values, &rndval, sizeof(stcb->asoc.hb_random_values));
274 this_random = stcb->asoc.hb_random_values[0];
275 stcb->asoc.hb_random_idx++;
276 stcb->asoc.hb_ect_randombit = 0;
277 } else {
278 this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
279 stcb->asoc.hb_random_idx++;
280 stcb->asoc.hb_ect_randombit = 0;
281 }
282 if (this_random % 2 == 1) {
283 max_cwnd_net = mnet;
284 max_cwnd = mnet->cwnd; /* Useless? */
285 }
286 }
287 }
288 if (max_cwnd_net == NULL) {
289 if (min_errors_net == NULL) {
290 return (net);
291 }
292 return (min_errors_net);
293 } else {
294 return (max_cwnd_net);
295 }
296 } /* JRS 5/14/07 - If mode is set to 1, use the CMT policy for choosing an alternate net. */
297 else if (mode == 1) {
298 TAILQ_FOREACH(mnet, &stcb->asoc.nets, sctp_next) {
299 if (((mnet->dest_state & SCTP_ADDR_REACHABLE) != SCTP_ADDR_REACHABLE) ||
300 (mnet->dest_state & SCTP_ADDR_UNCONFIRMED)) {
301 /*
302 * will skip ones that are not-reachable or
303 * unconfirmed
304 */
305 continue;
306 }
307 if (max_cwnd < mnet->cwnd) {
308 max_cwnd_net = mnet;
309 max_cwnd = mnet->cwnd;
310 } else if (max_cwnd == mnet->cwnd) {
311 uint32_t rndval;
312 uint8_t this_random;
313
314 if (stcb->asoc.hb_random_idx > 3) {
315 rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
316 memcpy(stcb->asoc.hb_random_values, &rndval,
317 sizeof(stcb->asoc.hb_random_values));
318 this_random = stcb->asoc.hb_random_values[0];
319 stcb->asoc.hb_random_idx = 0;
320 stcb->asoc.hb_ect_randombit = 0;
321 } else {
322 this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
323 stcb->asoc.hb_random_idx++;
324 stcb->asoc.hb_ect_randombit = 0;
325 }
326 if (this_random % 2) {
327 max_cwnd_net = mnet;
328 max_cwnd = mnet->cwnd;
329 }
330 }
331 }
332 if (max_cwnd_net) {
333 return (max_cwnd_net);
334 }
335 }
336 mnet = net;
337 once = 0;
338
339 if (mnet == NULL) {
340 mnet = TAILQ_FIRST(&stcb->asoc.nets);
341 if (mnet == NULL) {
342 return (NULL);
343 }
344 }
345 do {
346 alt = TAILQ_NEXT(mnet, sctp_next);
347 if (alt == NULL)
348 {
349 once++;
350 if (once > 1) {
351 break;
352 }
353 alt = TAILQ_FIRST(&stcb->asoc.nets);
354 if (alt == NULL) {
355 return (NULL);
356 }
357 }
358 if (alt->ro.ro_rt == NULL) {
359 if (alt->ro._s_addr) {
360 sctp_free_ifa(alt->ro._s_addr);
361 alt->ro._s_addr = NULL;
362 }
363 alt->src_addr_selected = 0;
364 }
365 /*sa_ignore NO_NULL_CHK*/
366 if (((alt->dest_state & SCTP_ADDR_REACHABLE) == SCTP_ADDR_REACHABLE) &&
367 (alt->ro.ro_rt != NULL) &&
368 (!(alt->dest_state & SCTP_ADDR_UNCONFIRMED))) {
369 /* Found a reachable address */
370 break;
371 }
372 mnet = alt;
373 } while (alt != NULL);
374
375 if (alt == NULL) {
376 /* Case where NO insv network exists (dormant state) */
377 /* we rotate destinations */
378 once = 0;
379 mnet = net;
380 do {
381 if (mnet == NULL) {
382 return (TAILQ_FIRST(&stcb->asoc.nets));
383 }
384 alt = TAILQ_NEXT(mnet, sctp_next);
385 if (alt == NULL) {
386 once++;
387 if (once > 1) {
388 break;
389 }
390 alt = TAILQ_FIRST(&stcb->asoc.nets);
391 }
392 /*sa_ignore NO_NULL_CHK*/
393 if ((!(alt->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
394 (alt != net)) {
395 /* Found an alternate address */
396 break;
397 }
398 mnet = alt;
399 } while (alt != NULL);
400 }
401 if (alt == NULL) {
402 return (net);
403 }
404 return (alt);
405 }
406
407 static void
408 sctp_backoff_on_timeout(struct sctp_tcb *stcb,
409 struct sctp_nets *net,
410 int win_probe,
411 int num_marked, int num_abandoned)
412 {
413 if (net->RTO == 0) {
414 net->RTO = stcb->asoc.minrto;
415 }
416 net->RTO <<= 1;
417 if (net->RTO > stcb->asoc.maxrto) {
418 net->RTO = stcb->asoc.maxrto;
419 }
420 if ((win_probe == 0) && (num_marked || num_abandoned)) {
421 /* We don't apply penalty to window probe scenarios */
422 /* JRS - Use the congestion control given in the CC module */
423 stcb->asoc.cc_functions.sctp_cwnd_update_after_timeout(stcb, net);
424 }
425 }
426
427 #ifndef INVARIANTS
428 static void
429 sctp_recover_sent_list(struct sctp_tcb *stcb)
430 {
431 struct sctp_tmit_chunk *chk, *nchk;
432 struct sctp_association *asoc;
433
434 asoc = &stcb->asoc;
435 TAILQ_FOREACH_SAFE(chk, &asoc->sent_queue, sctp_next, nchk) {
436 if (SCTP_TSN_GE(asoc->last_acked_seq, chk->rec.data.TSN_seq)) {
437 SCTP_PRINTF("Found chk:%p tsn:%x <= last_acked_seq:%x\n",
438 (void *)chk, chk->rec.data.TSN_seq, asoc->last_acked_seq);
439 if (chk->sent != SCTP_DATAGRAM_NR_ACKED) {
440 if (asoc->strmout[chk->rec.data.stream_number].chunks_on_queues > 0) {
441 asoc->strmout[chk->rec.data.stream_number].chunks_on_queues--;
442 }
443 }
444 TAILQ_REMOVE(&asoc->sent_queue, chk, sctp_next);
445 if (PR_SCTP_ENABLED(chk->flags)) {
446 if (asoc->pr_sctp_cnt != 0)
447 asoc->pr_sctp_cnt--;
448 }
449 if (chk->data) {
450 /*sa_ignore NO_NULL_CHK*/
451 sctp_free_bufspace(stcb, asoc, chk, 1);
452 sctp_m_freem(chk->data);
453 chk->data = NULL;
454 if (asoc->peer_supports_prsctp && PR_SCTP_BUF_ENABLED(chk->flags)) {
455 asoc->sent_queue_cnt_removeable--;
456 }
457 }
458 asoc->sent_queue_cnt--;
459 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
460 }
461 }
462 SCTP_PRINTF("after recover order is as follows\n");
463 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
464 SCTP_PRINTF("chk:%p TSN:%x\n", (void *)chk, chk->rec.data.TSN_seq);
465 }
466 }
467 #endif
468
469 static int
470 sctp_mark_all_for_resend(struct sctp_tcb *stcb,
471 struct sctp_nets *net,
472 struct sctp_nets *alt,
473 int window_probe,
474 int *num_marked,
475 int *num_abandoned)
476 {
477
478 /*
479 * Mark all chunks (well not all) that were sent to *net for
480 * retransmission. Move them to alt for there destination as well...
481 * We only mark chunks that have been outstanding long enough to
482 * have received feed-back.
483 */
484 struct sctp_tmit_chunk *chk, *nchk;
485 struct sctp_nets *lnets;
486 struct timeval now, min_wait, tv;
487 int cur_rto;
488 int cnt_abandoned;
489 int audit_tf, num_mk, fir;
490 unsigned int cnt_mk;
491 uint32_t orig_flight, orig_tf;
492 uint32_t tsnlast, tsnfirst;
493 int recovery_cnt = 0;
494
495
496 /* none in flight now */
497 audit_tf = 0;
498 fir = 0;
499 /*
500 * figure out how long a data chunk must be pending before we can
501 * mark it ..
502 */
503 (void)SCTP_GETTIME_TIMEVAL(&now);
504 /* get cur rto in micro-seconds */
505 cur_rto = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv;
506 cur_rto *= 1000;
507 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
508 sctp_log_fr(cur_rto,
509 stcb->asoc.peers_rwnd,
510 window_probe,
511 SCTP_FR_T3_MARK_TIME);
512 sctp_log_fr(net->flight_size, 0, 0, SCTP_FR_CWND_REPORT);
513 sctp_log_fr(net->flight_size, net->cwnd, stcb->asoc.total_flight, SCTP_FR_CWND_REPORT);
514 }
515 tv.tv_sec = cur_rto / 1000000;
516 tv.tv_usec = cur_rto % 1000000;
517 #ifndef __FreeBSD__
518 timersub(&now, &tv, &min_wait);
519 #else
520 min_wait = now;
521 timevalsub(&min_wait, &tv);
522 #endif
523 if (min_wait.tv_sec < 0 || min_wait.tv_usec < 0) {
524 /*
525 * if we hit here, we don't have enough seconds on the clock
526 * to account for the RTO. We just let the lower seconds be
527 * the bounds and don't worry about it. This may mean we
528 * will mark a lot more than we should.
529 */
530 min_wait.tv_sec = min_wait.tv_usec = 0;
531 }
532 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
533 sctp_log_fr(cur_rto, now.tv_sec, now.tv_usec, SCTP_FR_T3_MARK_TIME);
534 sctp_log_fr(0, min_wait.tv_sec, min_wait.tv_usec, SCTP_FR_T3_MARK_TIME);
535 }
536 /*
537 * Our rwnd will be incorrect here since we are not adding back the
538 * cnt * mbuf but we will fix that down below.
539 */
540 orig_flight = net->flight_size;
541 orig_tf = stcb->asoc.total_flight;
542
543 net->fast_retran_ip = 0;
544 /* Now on to each chunk */
545 cnt_abandoned = 0;
546 num_mk = cnt_mk = 0;
547 tsnfirst = tsnlast = 0;
548 #ifndef INVARIANTS
549 start_again:
550 #endif
551 TAILQ_FOREACH_SAFE(chk, &stcb->asoc.sent_queue, sctp_next, nchk) {
552 if (SCTP_TSN_GE(stcb->asoc.last_acked_seq, chk->rec.data.TSN_seq)) {
553 /* Strange case our list got out of order? */
554 SCTP_PRINTF("Our list is out of order? last_acked:%x chk:%x\n",
555 (unsigned int)stcb->asoc.last_acked_seq, (unsigned int)chk->rec.data.TSN_seq);
556 recovery_cnt++;
557 #ifdef INVARIANTS
558 panic("last acked >= chk on sent-Q");
559 #else
560 SCTP_PRINTF("Recover attempts a restart cnt:%d\n", recovery_cnt);
561 sctp_recover_sent_list(stcb);
562 if (recovery_cnt < 10) {
563 goto start_again;
564 } else {
565 SCTP_PRINTF("Recovery fails %d times??\n", recovery_cnt);
566 }
567 #endif
568 }
569 if ((chk->whoTo == net) && (chk->sent < SCTP_DATAGRAM_ACKED)) {
570 /*
571 * found one to mark: If it is less than
572 * DATAGRAM_ACKED it MUST not be a skipped or marked
573 * TSN but instead one that is either already set
574 * for retransmission OR one that needs
575 * retransmission.
576 */
577
578 /* validate its been outstanding long enough */
579 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
580 sctp_log_fr(chk->rec.data.TSN_seq,
581 chk->sent_rcv_time.tv_sec,
582 chk->sent_rcv_time.tv_usec,
583 SCTP_FR_T3_MARK_TIME);
584 }
585 if ((chk->sent_rcv_time.tv_sec > min_wait.tv_sec) && (window_probe == 0)) {
586 /*
587 * we have reached a chunk that was sent
588 * some seconds past our min.. forget it we
589 * will find no more to send.
590 */
591 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
592 sctp_log_fr(0,
593 chk->sent_rcv_time.tv_sec,
594 chk->sent_rcv_time.tv_usec,
595 SCTP_FR_T3_STOPPED);
596 }
597 continue;
598 } else if ((chk->sent_rcv_time.tv_sec == min_wait.tv_sec) &&
599 (window_probe == 0)) {
600 /*
601 * we must look at the micro seconds to
602 * know.
603 */
604 if (chk->sent_rcv_time.tv_usec >= min_wait.tv_usec) {
605 /*
606 * ok it was sent after our boundary
607 * time.
608 */
609 continue;
610 }
611 }
612 if (stcb->asoc.peer_supports_prsctp && PR_SCTP_TTL_ENABLED(chk->flags)) {
613 /* Is it expired? */
614 #ifndef __FreeBSD__
615 if (timercmp(&now, &chk->rec.data.timetodrop, >)) {
616 #else
617 if (timevalcmp(&now, &chk->rec.data.timetodrop, >)) {
618 #endif
619 /* Yes so drop it */
620 if (chk->data) {
621 (void)sctp_release_pr_sctp_chunk(stcb,
622 chk,
623 1,
624 SCTP_SO_NOT_LOCKED);
625 cnt_abandoned++;
626 }
627 continue;
628 }
629 }
630 if (stcb->asoc.peer_supports_prsctp && PR_SCTP_RTX_ENABLED(chk->flags)) {
631 /* Has it been retransmitted tv_sec times? */
632 if (chk->snd_count > chk->rec.data.timetodrop.tv_sec) {
633 if (chk->data) {
634 (void)sctp_release_pr_sctp_chunk(stcb,
635 chk,
636 1,
637 SCTP_SO_NOT_LOCKED);
638 cnt_abandoned++;
639 }
640 continue;
641 }
642 }
643 if (chk->sent < SCTP_DATAGRAM_RESEND) {
644 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
645 num_mk++;
646 if (fir == 0) {
647 fir = 1;
648 tsnfirst = chk->rec.data.TSN_seq;
649 }
650 tsnlast = chk->rec.data.TSN_seq;
651 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
652 sctp_log_fr(chk->rec.data.TSN_seq, chk->snd_count,
653 0, SCTP_FR_T3_MARKED);
654 }
655
656 if (chk->rec.data.chunk_was_revoked) {
657 /* deflate the cwnd */
658 chk->whoTo->cwnd -= chk->book_size;
659 chk->rec.data.chunk_was_revoked = 0;
660 }
661 net->marked_retrans++;
662 stcb->asoc.marked_retrans++;
663 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
664 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_RSND_TO,
665 chk->whoTo->flight_size,
666 chk->book_size,
667 (uintptr_t)chk->whoTo,
668 chk->rec.data.TSN_seq);
669 }
670 sctp_flight_size_decrease(chk);
671 sctp_total_flight_decrease(stcb, chk);
672 stcb->asoc.peers_rwnd += chk->send_size;
673 stcb->asoc.peers_rwnd += SCTP_BASE_SYSCTL(sctp_peer_chunk_oh);
674 }
675 chk->sent = SCTP_DATAGRAM_RESEND;
676 SCTP_STAT_INCR(sctps_markedretrans);
677
678 /* reset the TSN for striking and other FR stuff */
679 chk->rec.data.doing_fast_retransmit = 0;
680 /* Clear any time so NO RTT is being done */
681
682 if (chk->do_rtt) {
683 if (chk->whoTo->rto_needed == 0) {
684 chk->whoTo->rto_needed = 1;
685 }
686 }
687 chk->do_rtt = 0;
688 if (alt != net) {
689 sctp_free_remote_addr(chk->whoTo);
690 chk->no_fr_allowed = 1;
691 chk->whoTo = alt;
692 atomic_add_int(&alt->ref_count, 1);
693 } else {
694 chk->no_fr_allowed = 0;
695 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
696 chk->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
697 } else {
698 chk->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
699 }
700 }
701 /* CMT: Do not allow FRs on retransmitted TSNs.
702 */
703 if (stcb->asoc.sctp_cmt_on_off > 0) {
704 chk->no_fr_allowed = 1;
705 }
706 #ifdef THIS_SHOULD_NOT_BE_DONE
707 } else if (chk->sent == SCTP_DATAGRAM_ACKED) {
708 /* remember highest acked one */
709 could_be_sent = chk;
710 #endif
711 }
712 if (chk->sent == SCTP_DATAGRAM_RESEND) {
713 cnt_mk++;
714 }
715 }
716 if ((orig_flight - net->flight_size) != (orig_tf - stcb->asoc.total_flight)) {
717 /* we did not subtract the same things? */
718 audit_tf = 1;
719 }
720
721 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
722 sctp_log_fr(tsnfirst, tsnlast, num_mk, SCTP_FR_T3_TIMEOUT);
723 }
724 #ifdef SCTP_DEBUG
725 if (num_mk) {
726 SCTPDBG(SCTP_DEBUG_TIMER1, "LAST TSN marked was %x\n",
727 tsnlast);
728 SCTPDBG(SCTP_DEBUG_TIMER1, "Num marked for retransmission was %d peer-rwd:%ld\n",
729 num_mk, (u_long)stcb->asoc.peers_rwnd);
730 SCTPDBG(SCTP_DEBUG_TIMER1, "LAST TSN marked was %x\n",
731 tsnlast);
732 SCTPDBG(SCTP_DEBUG_TIMER1, "Num marked for retransmission was %d peer-rwd:%d\n",
733 num_mk,
734 (int)stcb->asoc.peers_rwnd);
735 }
736 #endif
737 *num_marked = num_mk;
738 *num_abandoned = cnt_abandoned;
739 /* Now check for a ECN Echo that may be stranded And
740 * include the cnt_mk'd to have all resends in the
741 * control queue.
742 */
743 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
744 if (chk->sent == SCTP_DATAGRAM_RESEND) {
745 cnt_mk++;
746 }
747 if ((chk->whoTo == net) &&
748 (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
749 sctp_free_remote_addr(chk->whoTo);
750 chk->whoTo = alt;
751 if (chk->sent != SCTP_DATAGRAM_RESEND) {
752 chk->sent = SCTP_DATAGRAM_RESEND;
753 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
754 cnt_mk++;
755 }
756 atomic_add_int(&alt->ref_count, 1);
757 }
758 }
759 #ifdef THIS_SHOULD_NOT_BE_DONE
760 if ((stcb->asoc.sent_queue_retran_cnt == 0) && (could_be_sent)) {
761 /* fix it so we retransmit the highest acked anyway */
762 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
763 cnt_mk++;
764 could_be_sent->sent = SCTP_DATAGRAM_RESEND;
765 }
766 #endif
767 if (stcb->asoc.sent_queue_retran_cnt != cnt_mk) {
768 #ifdef INVARIANTS
769 SCTP_PRINTF("Local Audit says there are %d for retran asoc cnt:%d we marked:%d this time\n",
770 cnt_mk, stcb->asoc.sent_queue_retran_cnt, num_mk);
771 #endif
772 #ifndef SCTP_AUDITING_ENABLED
773 stcb->asoc.sent_queue_retran_cnt = cnt_mk;
774 #endif
775 }
776 if (audit_tf) {
777 SCTPDBG(SCTP_DEBUG_TIMER4,
778 "Audit total flight due to negative value net:%p\n",
779 (void *)net);
780 stcb->asoc.total_flight = 0;
781 stcb->asoc.total_flight_count = 0;
782 /* Clear all networks flight size */
783 TAILQ_FOREACH(lnets, &stcb->asoc.nets, sctp_next) {
784 lnets->flight_size = 0;
785 SCTPDBG(SCTP_DEBUG_TIMER4,
786 "Net:%p c-f cwnd:%d ssthresh:%d\n",
787 (void *)lnets, lnets->cwnd, lnets->ssthresh);
788 }
789 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
790 if (chk->sent < SCTP_DATAGRAM_RESEND) {
791 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
792 sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
793 chk->whoTo->flight_size,
794 chk->book_size,
795 (uintptr_t)chk->whoTo,
796 chk->rec.data.TSN_seq);
797 }
798
799 sctp_flight_size_increase(chk);
800 sctp_total_flight_increase(stcb, chk);
801 }
802 }
803 }
804 /* We return 1 if we only have a window probe outstanding */
805 return (0);
806 }
807
808
809 int
810 sctp_t3rxt_timer(struct sctp_inpcb *inp,
811 struct sctp_tcb *stcb,
812 struct sctp_nets *net)
813 {
814 struct sctp_nets *alt;
815 int win_probe, num_mk, num_abandoned;
816
817 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
818 sctp_log_fr(0, 0, 0, SCTP_FR_T3_TIMEOUT);
819 }
820 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
821 struct sctp_nets *lnet;
822
823 TAILQ_FOREACH(lnet, &stcb->asoc.nets, sctp_next) {
824 if (net == lnet) {
825 sctp_log_cwnd(stcb, lnet, 1, SCTP_CWND_LOG_FROM_T3);
826 } else {
827 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_LOG_FROM_T3);
828 }
829 }
830 }
831 /* Find an alternate and mark those for retransmission */
832 if ((stcb->asoc.peers_rwnd == 0) &&
833 (stcb->asoc.total_flight < net->mtu)) {
834 SCTP_STAT_INCR(sctps_timowindowprobe);
835 win_probe = 1;
836 } else {
837 win_probe = 0;
838 }
839
840 if (win_probe == 0) {
841 /* We don't do normal threshold management on window probes */
842 if (sctp_threshold_management(inp, stcb, net,
843 stcb->asoc.max_send_times)) {
844 /* Association was destroyed */
845 return (1);
846 } else {
847 if (net != stcb->asoc.primary_destination) {
848 /* send a immediate HB if our RTO is stale */
849 struct timeval now;
850 unsigned int ms_goneby;
851
852 (void)SCTP_GETTIME_TIMEVAL(&now);
853 if (net->last_sent_time.tv_sec) {
854 ms_goneby = (now.tv_sec - net->last_sent_time.tv_sec) * 1000;
855 } else {
856 ms_goneby = 0;
857 }
858 if ((net->dest_state & SCTP_ADDR_PF) == 0) {
859 if ((ms_goneby > net->RTO) || (net->RTO == 0)) {
860 /*
861 * no recent feed back in an RTO or
862 * more, request a RTT update
863 */
864 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
865 }
866 }
867 }
868 }
869 } else {
870 /*
871 * For a window probe we don't penalize the net's but only
872 * the association. This may fail it if SACKs are not coming
873 * back. If sack's are coming with rwnd locked at 0, we will
874 * continue to hold things waiting for rwnd to raise
875 */
876 if (sctp_threshold_management(inp, stcb, NULL,
877 stcb->asoc.max_send_times)) {
878 /* Association was destroyed */
879 return (1);
880 }
881 }
882 if (stcb->asoc.sctp_cmt_on_off > 0) {
883 if (net->pf_threshold < net->failure_threshold) {
884 alt = sctp_find_alternate_net(stcb, net, 2);
885 } else {
886 /*
887 * CMT: Using RTX_SSTHRESH policy for CMT.
888 * If CMT is being used, then pick dest with
889 * largest ssthresh for any retransmission.
890 */
891 alt = sctp_find_alternate_net(stcb, net, 1);
892 /*
893 * CUCv2: If a different dest is picked for
894 * the retransmission, then new
895 * (rtx-)pseudo_cumack needs to be tracked
896 * for orig dest. Let CUCv2 track new (rtx-)
897 * pseudo-cumack always.
898 */
899 net->find_pseudo_cumack = 1;
900 net->find_rtx_pseudo_cumack = 1;
901 }
902 } else {
903 alt = sctp_find_alternate_net(stcb, net, 0);
904 }
905
906 num_mk = 0;
907 num_abandoned = 0;
908 (void)sctp_mark_all_for_resend(stcb, net, alt, win_probe,
909 &num_mk, &num_abandoned);
910 /* FR Loss recovery just ended with the T3. */
911 stcb->asoc.fast_retran_loss_recovery = 0;
912
913 /* CMT FR loss recovery ended with the T3 */
914 net->fast_retran_loss_recovery = 0;
915 if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
916 (net->flight_size == 0)) {
917 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins)(stcb, net);
918 }
919
920 /*
921 * setup the sat loss recovery that prevents satellite cwnd advance.
922 */
923 stcb->asoc.sat_t3_loss_recovery = 1;
924 stcb->asoc.sat_t3_recovery_tsn = stcb->asoc.sending_seq;
925
926 /* Backoff the timer and cwnd */
927 sctp_backoff_on_timeout(stcb, net, win_probe, num_mk, num_abandoned);
928 if ((!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
929 (net->dest_state & SCTP_ADDR_PF)) {
930 /* Move all pending over too */
931 sctp_move_chunks_from_net(stcb, net);
932
933 /* Get the address that failed, to
934 * force a new src address selecton and
935 * a route allocation.
936 */
937 if (net->ro._s_addr) {
938 sctp_free_ifa(net->ro._s_addr);
939 net->ro._s_addr = NULL;
940 }
941 net->src_addr_selected = 0;
942
943 /* Force a route allocation too */
944 if (net->ro.ro_rt) {
945 RTFREE(net->ro.ro_rt);
946 net->ro.ro_rt = NULL;
947 }
948
949 /* Was it our primary? */
950 if ((stcb->asoc.primary_destination == net) && (alt != net)) {
951 /*
952 * Yes, note it as such and find an alternate note:
953 * this means HB code must use this to resent the
954 * primary if it goes active AND if someone does a
955 * change-primary then this flag must be cleared
956 * from any net structures.
957 */
958 if (stcb->asoc.alternate) {
959 sctp_free_remote_addr(stcb->asoc.alternate);
960 }
961 stcb->asoc.alternate = alt;
962 atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
963 }
964 }
965 /*
966 * Special case for cookie-echo'ed case, we don't do output but must
967 * await the COOKIE-ACK before retransmission
968 */
969 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
970 /*
971 * Here we just reset the timer and start again since we
972 * have not established the asoc
973 */
974 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
975 return (0);
976 }
977 if (stcb->asoc.peer_supports_prsctp) {
978 struct sctp_tmit_chunk *lchk;
979
980 lchk = sctp_try_advance_peer_ack_point(stcb, &stcb->asoc);
981 /* C3. See if we need to send a Fwd-TSN */
982 if (SCTP_TSN_GT(stcb->asoc.advanced_peer_ack_point, stcb->asoc.last_acked_seq)) {
983 send_forward_tsn(stcb, &stcb->asoc);
984 if (lchk) {
985 /* Assure a timer is up */
986 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, lchk->whoTo);
987 }
988 }
989 }
990 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
991 sctp_log_cwnd(stcb, net, net->cwnd, SCTP_CWND_LOG_FROM_RTX);
992 }
993 return (0);
994 }
995
996 int
997 sctp_t1init_timer(struct sctp_inpcb *inp,
998 struct sctp_tcb *stcb,
999 struct sctp_nets *net)
1000 {
1001 /* bump the thresholds */
1002 if (stcb->asoc.delayed_connection) {
1003 /*
1004 * special hook for delayed connection. The library did NOT
1005 * complete the rest of its sends.
1006 */
1007 stcb->asoc.delayed_connection = 0;
1008 sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
1009 return (0);
1010 }
1011 if (SCTP_GET_STATE((&stcb->asoc)) != SCTP_STATE_COOKIE_WAIT) {
1012 return (0);
1013 }
1014 if (sctp_threshold_management(inp, stcb, net,
1015 stcb->asoc.max_init_times)) {
1016 /* Association was destroyed */
1017 return (1);
1018 }
1019 stcb->asoc.dropped_special_cnt = 0;
1020 sctp_backoff_on_timeout(stcb, stcb->asoc.primary_destination, 1, 0, 0);
1021 if (stcb->asoc.initial_init_rto_max < net->RTO) {
1022 net->RTO = stcb->asoc.initial_init_rto_max;
1023 }
1024 if (stcb->asoc.numnets > 1) {
1025 /* If we have more than one addr use it */
1026 struct sctp_nets *alt;
1027
1028 alt = sctp_find_alternate_net(stcb, stcb->asoc.primary_destination, 0);
1029 if (alt != stcb->asoc.primary_destination) {
1030 sctp_move_chunks_from_net(stcb, stcb->asoc.primary_destination);
1031 stcb->asoc.primary_destination = alt;
1032 }
1033 }
1034 /* Send out a new init */
1035 sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
1036 return (0);
1037 }
1038
1039 /*
1040 * For cookie and asconf we actually need to find and mark for resend, then
1041 * increment the resend counter (after all the threshold management stuff of
1042 * course).
1043 */
1044 int
1045 sctp_cookie_timer(struct sctp_inpcb *inp,
1046 struct sctp_tcb *stcb,
1047 struct sctp_nets *net SCTP_UNUSED)
1048 {
1049 struct sctp_nets *alt;
1050 struct sctp_tmit_chunk *cookie;
1051
1052 /* first before all else we must find the cookie */
1053 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, sctp_next) {
1054 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
1055 break;
1056 }
1057 }
1058 if (cookie == NULL) {
1059 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
1060 /* FOOBAR! */
1061 struct mbuf *oper;
1062
1063 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)),
1064 0, M_NOWAIT, 1, MT_DATA);
1065 if (oper) {
1066 struct sctp_paramhdr *ph;
1067 uint32_t *ippp;
1068
1069 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
1070 sizeof(uint32_t);
1071 ph = mtod(oper, struct sctp_paramhdr *);
1072 ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
1073 ph->param_length = htons(SCTP_BUF_LEN(oper));
1074 ippp = (uint32_t *) (ph + 1);
1075 *ippp = htonl(SCTP_FROM_SCTP_TIMER+SCTP_LOC_3);
1076 }
1077 inp->last_abort_code = SCTP_FROM_SCTP_TIMER+SCTP_LOC_4;
1078 sctp_abort_an_association(inp, stcb, oper, SCTP_SO_NOT_LOCKED);
1079 } else {
1080 #ifdef INVARIANTS
1081 panic("Cookie timer expires in wrong state?");
1082 #else
1083 SCTP_PRINTF("Strange in state %d not cookie-echoed yet c-e timer expires?\n", SCTP_GET_STATE(&stcb->asoc));
1084 return (0);
1085 #endif
1086 }
1087 return (0);
1088 }
1089 /* Ok we found the cookie, threshold management next */
1090 if (sctp_threshold_management(inp, stcb, cookie->whoTo,
1091 stcb->asoc.max_init_times)) {
1092 /* Assoc is over */
1093 return (1);
1094 }
1095 /*
1096 * cleared theshold management now lets backoff the address & select
1097 * an alternate
1098 */
1099 stcb->asoc.dropped_special_cnt = 0;
1100 sctp_backoff_on_timeout(stcb, cookie->whoTo, 1, 0, 0);
1101 alt = sctp_find_alternate_net(stcb, cookie->whoTo, 0);
1102 if (alt != cookie->whoTo) {
1103 sctp_free_remote_addr(cookie->whoTo);
1104 cookie->whoTo = alt;
1105 atomic_add_int(&alt->ref_count, 1);
1106 }
1107 /* Now mark the retran info */
1108 if (cookie->sent != SCTP_DATAGRAM_RESEND) {
1109 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1110 }
1111 cookie->sent = SCTP_DATAGRAM_RESEND;
1112 /*
1113 * Now call the output routine to kick out the cookie again, Note we
1114 * don't mark any chunks for retran so that FR will need to kick in
1115 * to move these (or a send timer).
1116 */
1117 return (0);
1118 }
1119
1120 int
1121 sctp_strreset_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1122 struct sctp_nets *net)
1123 {
1124 struct sctp_nets *alt;
1125 struct sctp_tmit_chunk *strrst = NULL, *chk = NULL;
1126
1127 if (stcb->asoc.stream_reset_outstanding == 0) {
1128 return (0);
1129 }
1130 /* find the existing STRRESET, we use the seq number we sent out on */
1131 (void)sctp_find_stream_reset(stcb, stcb->asoc.str_reset_seq_out, &strrst);
1132 if (strrst == NULL) {
1133 return (0);
1134 }
1135 /* do threshold management */
1136 if (sctp_threshold_management(inp, stcb, strrst->whoTo,
1137 stcb->asoc.max_send_times)) {
1138 /* Assoc is over */
1139 return (1);
1140 }
1141 /*
1142 * cleared theshold management now lets backoff the address & select
1143 * an alternate
1144 */
1145 sctp_backoff_on_timeout(stcb, strrst->whoTo, 1, 0, 0);
1146 alt = sctp_find_alternate_net(stcb, strrst->whoTo, 0);
1147 sctp_free_remote_addr(strrst->whoTo);
1148 strrst->whoTo = alt;
1149 atomic_add_int(&alt->ref_count, 1);
1150
1151 /* See if a ECN Echo is also stranded */
1152 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
1153 if ((chk->whoTo == net) &&
1154 (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
1155 sctp_free_remote_addr(chk->whoTo);
1156 if (chk->sent != SCTP_DATAGRAM_RESEND) {
1157 chk->sent = SCTP_DATAGRAM_RESEND;
1158 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1159 }
1160 chk->whoTo = alt;
1161 atomic_add_int(&alt->ref_count, 1);
1162 }
1163 }
1164 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
1165 /*
1166 * If the address went un-reachable, we need to move to
1167 * alternates for ALL chk's in queue
1168 */
1169 sctp_move_chunks_from_net(stcb, net);
1170 }
1171 /* mark the retran info */
1172 if (strrst->sent != SCTP_DATAGRAM_RESEND)
1173 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1174 strrst->sent = SCTP_DATAGRAM_RESEND;
1175
1176 /* restart the timer */
1177 sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, inp, stcb, strrst->whoTo);
1178 return (0);
1179 }
1180
1181 int
1182 sctp_asconf_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1183 struct sctp_nets *net)
1184 {
1185 struct sctp_nets *alt;
1186 struct sctp_tmit_chunk *asconf, *chk;
1187
1188 /* is this a first send, or a retransmission? */
1189 if (TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) {
1190 /* compose a new ASCONF chunk and send it */
1191 sctp_send_asconf(stcb, net, SCTP_ADDR_NOT_LOCKED);
1192 } else {
1193 /*
1194 * Retransmission of the existing ASCONF is needed
1195 */
1196
1197 /* find the existing ASCONF */
1198 asconf = TAILQ_FIRST(&stcb->asoc.asconf_send_queue);
1199 if (asconf == NULL) {
1200 return (0);
1201 }
1202 /* do threshold management */
1203 if (sctp_threshold_management(inp, stcb, asconf->whoTo,
1204 stcb->asoc.max_send_times)) {
1205 /* Assoc is over */
1206 return (1);
1207 }
1208 if (asconf->snd_count > stcb->asoc.max_send_times) {
1209 /*
1210 * Something is rotten: our peer is not responding to
1211 * ASCONFs but apparently is to other chunks. i.e. it
1212 * is not properly handling the chunk type upper bits.
1213 * Mark this peer as ASCONF incapable and cleanup.
1214 */
1215 SCTPDBG(SCTP_DEBUG_TIMER1, "asconf_timer: Peer has not responded to our repeated ASCONFs\n");
1216 sctp_asconf_cleanup(stcb, net);
1217 return (0);
1218 }
1219 /*
1220 * cleared threshold management, so now backoff the net and
1221 * select an alternate
1222 */
1223 sctp_backoff_on_timeout(stcb, asconf->whoTo, 1, 0, 0);
1224 alt = sctp_find_alternate_net(stcb, asconf->whoTo, 0);
1225 if (asconf->whoTo != alt) {
1226 sctp_free_remote_addr(asconf->whoTo);
1227 asconf->whoTo = alt;
1228 atomic_add_int(&alt->ref_count, 1);
1229 }
1230
1231 /* See if an ECN Echo is also stranded */
1232 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
1233 if ((chk->whoTo == net) &&
1234 (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
1235 sctp_free_remote_addr(chk->whoTo);
1236 chk->whoTo = alt;
1237 if (chk->sent != SCTP_DATAGRAM_RESEND) {
1238 chk->sent = SCTP_DATAGRAM_RESEND;
1239 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1240 }
1241 atomic_add_int(&alt->ref_count, 1);
1242 }
1243 }
1244 TAILQ_FOREACH(chk, &stcb->asoc.asconf_send_queue, sctp_next) {
1245 if (chk->whoTo != alt) {
1246 sctp_free_remote_addr(chk->whoTo);
1247 chk->whoTo = alt;
1248 atomic_add_int(&alt->ref_count, 1);
1249 }
1250 if (asconf->sent != SCTP_DATAGRAM_RESEND && chk->sent != SCTP_DATAGRAM_UNSENT)
1251 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1252 chk->sent = SCTP_DATAGRAM_RESEND;
1253 }
1254 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
1255 /*
1256 * If the address went un-reachable, we need to move
1257 * to the alternate for ALL chunks in queue
1258 */
1259 sctp_move_chunks_from_net(stcb, net);
1260 }
1261 /* mark the retran info */
1262 if (asconf->sent != SCTP_DATAGRAM_RESEND)
1263 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1264 asconf->sent = SCTP_DATAGRAM_RESEND;
1265
1266 /* send another ASCONF if any and we can do */
1267 sctp_send_asconf(stcb, alt, SCTP_ADDR_NOT_LOCKED);
1268 }
1269 return (0);
1270 }
1271
1272 /* Mobility adaptation */
1273 void
1274 sctp_delete_prim_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1275 struct sctp_nets *net SCTP_UNUSED)
1276 {
1277 if (stcb->asoc.deleted_primary == NULL) {
1278 SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: deleted_primary is not stored...\n");
1279 sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
1280 return;
1281 }
1282 SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: finished to keep deleted primary ");
1283 SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, &stcb->asoc.deleted_primary->ro._l_addr.sa);
1284 sctp_free_remote_addr(stcb->asoc.deleted_primary);
1285 stcb->asoc.deleted_primary = NULL;
1286 sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
1287 return;
1288 }
1289
1290 /*
1291 * For the shutdown and shutdown-ack, we do not keep one around on the
1292 * control queue. This means we must generate a new one and call the general
1293 * chunk output routine, AFTER having done threshold management.
1294 * It is assumed that net is non-NULL.
1295 */
1296 int
1297 sctp_shutdown_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1298 struct sctp_nets *net)
1299 {
1300 struct sctp_nets *alt;
1301
1302 /* first threshold managment */
1303 if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
1304 /* Assoc is over */
1305 return (1);
1306 }
1307 sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
1308 /* second select an alternative */
1309 alt = sctp_find_alternate_net(stcb, net, 0);
1310
1311 /* third generate a shutdown into the queue for out net */
1312 sctp_send_shutdown(stcb, alt);
1313
1314 /* fourth restart timer */
1315 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, inp, stcb, alt);
1316 return (0);
1317 }
1318
1319 int
1320 sctp_shutdownack_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1321 struct sctp_nets *net)
1322 {
1323 struct sctp_nets *alt;
1324
1325 /* first threshold managment */
1326 if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
1327 /* Assoc is over */
1328 return (1);
1329 }
1330 sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
1331 /* second select an alternative */
1332 alt = sctp_find_alternate_net(stcb, net, 0);
1333
1334 /* third generate a shutdown into the queue for out net */
1335 sctp_send_shutdown_ack(stcb, alt);
1336
1337 /* fourth restart timer */
1338 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, inp, stcb, alt);
1339 return (0);
1340 }
1341
1342 static void
1343 sctp_audit_stream_queues_for_size(struct sctp_inpcb *inp,
1344 struct sctp_tcb *stcb)
1345 {
1346 struct sctp_stream_queue_pending *sp;
1347 unsigned int i, chks_in_queue = 0;
1348 int being_filled = 0;
1349 /*
1350 * This function is ONLY called when the send/sent queues are empty.
1351 */
1352 if ((stcb == NULL) || (inp == NULL))
1353 return;
1354
1355 if (stcb->asoc.sent_queue_retran_cnt) {
1356 SCTP_PRINTF("Hmm, sent_queue_retran_cnt is non-zero %d\n",
1357 stcb->asoc.sent_queue_retran_cnt);
1358 stcb->asoc.sent_queue_retran_cnt = 0;
1359 }
1360 if (stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
1361 /* No stream scheduler information, initialize scheduler */
1362 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 0);
1363 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
1364 /* yep, we lost a stream or two */
1365 SCTP_PRINTF("Found additional streams NOT managed by scheduler, corrected\n");
1366 } else {
1367 /* no streams lost */
1368 stcb->asoc.total_output_queue_size = 0;
1369 }
1370 }
1371 /* Check to see if some data queued, if so report it */
1372 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1373 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
1374 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
1375 if (sp->msg_is_complete)
1376 being_filled++;
1377 chks_in_queue++;
1378 }
1379 }
1380 }
1381 if (chks_in_queue != stcb->asoc.stream_queue_cnt) {
1382 SCTP_PRINTF("Hmm, stream queue cnt at %d I counted %d in stream out wheel\n",
1383 stcb->asoc.stream_queue_cnt, chks_in_queue);
1384 }
1385 if (chks_in_queue) {
1386 /* call the output queue function */
1387 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_T3, SCTP_SO_NOT_LOCKED);
1388 if ((TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
1389 (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
1390 /*
1391 * Probably should go in and make it go back through
1392 * and add fragments allowed
1393 */
1394 if (being_filled == 0) {
1395 SCTP_PRINTF("Still nothing moved %d chunks are stuck\n",
1396 chks_in_queue);
1397 }
1398 }
1399 } else {
1400 SCTP_PRINTF("Found no chunks on any queue tot:%lu\n",
1401 (u_long)stcb->asoc.total_output_queue_size);
1402 stcb->asoc.total_output_queue_size = 0;
1403 }
1404 }
1405
1406 int
1407 sctp_heartbeat_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1408 struct sctp_nets *net)
1409 {
1410 uint8_t net_was_pf;
1411
1412 if (net->dest_state & SCTP_ADDR_PF) {
1413 net_was_pf = 1;
1414 } else {
1415 net_was_pf = 0;
1416 }
1417 if (net->hb_responded == 0) {
1418 if (net->ro._s_addr) {
1419 /* Invalidate the src address if we did not get
1420 * a response last time.
1421 */
1422 sctp_free_ifa(net->ro._s_addr);
1423 net->ro._s_addr = NULL;
1424 net->src_addr_selected = 0;
1425 }
1426 sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
1427 if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
1428 /* Assoc is over */
1429 return (1);
1430 }
1431 }
1432 /* Zero PBA, if it needs it */
1433 if (net->partial_bytes_acked) {
1434 net->partial_bytes_acked = 0;
1435 }
1436 if ((stcb->asoc.total_output_queue_size > 0) &&
1437 (TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
1438 (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
1439 sctp_audit_stream_queues_for_size(inp, stcb);
1440 }
1441 if (!(net->dest_state & SCTP_ADDR_NOHB) &&
1442 !((net_was_pf == 0) && (net->dest_state & SCTP_ADDR_PF))) {
1443 /* when move to PF during threshold mangement, a HB has been
1444 queued in that routine */
1445 uint32_t ms_gone_by;
1446
1447 if ((net->last_sent_time.tv_sec > 0) ||
1448 (net->last_sent_time.tv_usec > 0)) {
1449 #ifdef __FreeBSD__
1450 struct timeval diff;
1451
1452 SCTP_GETTIME_TIMEVAL(&diff);
1453 timevalsub(&diff, &net->last_sent_time);
1454 #else
1455 struct timeval diff, now;
1456
1457 SCTP_GETTIME_TIMEVAL(&now);
1458 timersub(&now, &net->last_sent_time, &diff);
1459 #endif
1460 ms_gone_by = (uint32_t)(diff.tv_sec * 1000) +
1461 (uint32_t)(diff.tv_usec / 1000);
1462 } else {
1463 ms_gone_by = 0xffffffff;
1464 }
1465 if ((ms_gone_by >= net->heart_beat_delay) ||
1466 (net->dest_state & SCTP_ADDR_PF)) {
1467 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
1468 }
1469 }
1470 return (0);
1471 }
1472
1473 void
1474 sctp_pathmtu_timer(struct sctp_inpcb *inp,
1475 struct sctp_tcb *stcb,
1476 struct sctp_nets *net)
1477 {
1478 uint32_t next_mtu, mtu;
1479
1480 next_mtu = sctp_get_next_mtu(net->mtu);
1481
1482 if ((next_mtu > net->mtu) && (net->port == 0)) {
1483 if ((net->src_addr_selected == 0) ||
1484 (net->ro._s_addr == NULL) ||
1485 (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
1486 if ((net->ro._s_addr != NULL) && (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
1487 sctp_free_ifa(net->ro._s_addr);
1488 net->ro._s_addr = NULL;
1489 net->src_addr_selected = 0;
1490 } else if (net->ro._s_addr == NULL) {
1491 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
1492 if (net->ro._l_addr.sa.sa_family == AF_INET6) {
1493 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1494 /* KAME hack: embed scopeid */
1495 #if defined(__APPLE__)
1496 #if defined(APPLE_LEOPARD) || defined(APPLE_SNOWLEOPARD)
1497 (void)in6_embedscope(&sin6->sin6_addr, sin6, NULL, NULL);
1498 #else
1499 (void)in6_embedscope(&sin6->sin6_addr, sin6, NULL, NULL, NULL);
1500 #endif
1501 #elif defined(SCTP_KAME)
1502 (void)sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
1503 #else
1504 (void)in6_embedscope(&sin6->sin6_addr, sin6);
1505 #endif
1506 }
1507 #endif
1508
1509 net->ro._s_addr = sctp_source_address_selection(inp,
1510 stcb,
1511 (sctp_route_t *)&net->ro,
1512 net, 0, stcb->asoc.vrf_id);
1513 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
1514 if (net->ro._l_addr.sa.sa_family == AF_INET6) {
1515 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1516 #ifdef SCTP_KAME
1517 (void)sa6_recoverscope(sin6);
1518 #else
1519 (void)in6_recoverscope(sin6, &sin6->sin6_addr, NULL);
1520 #endif /* SCTP_KAME */
1521 }
1522 #endif /* INET6 */
1523 }
1524 if (net->ro._s_addr)
1525 net->src_addr_selected = 1;
1526 }
1527 if (net->ro._s_addr) {
1528 mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._s_addr.sa, net->ro.ro_rt);
1529 if (net->port) {
1530 mtu -= sizeof(struct udphdr);
1531 }
1532 if (mtu > next_mtu) {
1533 net->mtu = next_mtu;
1534 }
1535 }
1536 }
1537 /* restart the timer */
1538 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net);
1539 }
1540
1541 void
1542 sctp_autoclose_timer(struct sctp_inpcb *inp,
1543 struct sctp_tcb *stcb,
1544 struct sctp_nets *net)
1545 {
1546 struct timeval tn, *tim_touse;
1547 struct sctp_association *asoc;
1548 int ticks_gone_by;
1549
1550 (void)SCTP_GETTIME_TIMEVAL(&tn);
1551 if (stcb->asoc.sctp_autoclose_ticks &&
1552 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1553 /* Auto close is on */
1554 asoc = &stcb->asoc;
1555 /* pick the time to use */
1556 if (asoc->time_last_rcvd.tv_sec >
1557 asoc->time_last_sent.tv_sec) {
1558 tim_touse = &asoc->time_last_rcvd;
1559 } else {
1560 tim_touse = &asoc->time_last_sent;
1561 }
1562 /* Now has long enough transpired to autoclose? */
1563 ticks_gone_by = SEC_TO_TICKS(tn.tv_sec - tim_touse->tv_sec);
1564 if ((ticks_gone_by > 0) &&
1565 (ticks_gone_by >= (int)asoc->sctp_autoclose_ticks)) {
1566 /*
1567 * autoclose time has hit, call the output routine,
1568 * which should do nothing just to be SURE we don't
1569 * have hanging data. We can then safely check the
1570 * queues and know that we are clear to send
1571 * shutdown
1572 */
1573 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_AUTOCLOSE_TMR, SCTP_SO_NOT_LOCKED);
1574 /* Are we clean? */
1575 if (TAILQ_EMPTY(&asoc->send_queue) &&
1576 TAILQ_EMPTY(&asoc->sent_queue)) {
1577 /*
1578 * there is nothing queued to send, so I'm
1579 * done...
1580 */
1581 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
1582 /* only send SHUTDOWN 1st time thru */
1583 struct sctp_nets *netp;
1584
1585 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
1586 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
1587 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
1588 }
1589 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
1590 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
1591 sctp_stop_timers_for_shutdown(stcb);
1592 if (stcb->asoc.alternate) {
1593 netp = stcb->asoc.alternate;
1594 } else {
1595 netp = stcb->asoc.primary_destination;
1596 }
1597 sctp_send_shutdown(stcb, netp);
1598 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
1599 stcb->sctp_ep, stcb,
1600 netp);
1601 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1602 stcb->sctp_ep, stcb,
1603 netp);
1604 }
1605 }
1606 } else {
1607 /*
1608 * No auto close at this time, reset t-o to check
1609 * later
1610 */
1611 int tmp;
1612
1613 /* fool the timer startup to use the time left */
1614 tmp = asoc->sctp_autoclose_ticks;
1615 asoc->sctp_autoclose_ticks -= ticks_gone_by;
1616 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1617 net);
1618 /* restore the real tick value */
1619 asoc->sctp_autoclose_ticks = tmp;
1620 }
1621 }
1622 }
1623

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