Line data Source code
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 279841 2015-03-10 09:16:31Z 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(INET) || defined(INET6)
58 : #if !defined(__Userspace_os_Windows)
59 : #include <netinet/udp.h>
60 : #endif
61 : #endif
62 :
63 : #if defined(__APPLE__)
64 : #define APPLE_FILE_NO 6
65 : #endif
66 :
67 : void
68 0 : sctp_audit_retranmission_queue(struct sctp_association *asoc)
69 : {
70 : struct sctp_tmit_chunk *chk;
71 :
72 0 : SCTPDBG(SCTP_DEBUG_TIMER4, "Audit invoked on send queue cnt:%d onqueue:%d\n",
73 : asoc->sent_queue_retran_cnt,
74 : asoc->sent_queue_cnt);
75 0 : asoc->sent_queue_retran_cnt = 0;
76 0 : asoc->sent_queue_cnt = 0;
77 0 : TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
78 0 : if (chk->sent == SCTP_DATAGRAM_RESEND) {
79 0 : sctp_ucount_incr(asoc->sent_queue_retran_cnt);
80 : }
81 0 : asoc->sent_queue_cnt++;
82 : }
83 0 : TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
84 0 : if (chk->sent == SCTP_DATAGRAM_RESEND) {
85 0 : sctp_ucount_incr(asoc->sent_queue_retran_cnt);
86 : }
87 : }
88 0 : TAILQ_FOREACH(chk, &asoc->asconf_send_queue, sctp_next) {
89 0 : if (chk->sent == SCTP_DATAGRAM_RESEND) {
90 0 : sctp_ucount_incr(asoc->sent_queue_retran_cnt);
91 : }
92 : }
93 0 : SCTPDBG(SCTP_DEBUG_TIMER4, "Audit completes retran:%d onqueue:%d\n",
94 : asoc->sent_queue_retran_cnt,
95 : asoc->sent_queue_cnt);
96 0 : }
97 :
98 : int
99 0 : sctp_threshold_management(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
100 : struct sctp_nets *net, uint16_t threshold)
101 : {
102 0 : if (net) {
103 0 : net->error_count++;
104 0 : SCTPDBG(SCTP_DEBUG_TIMER4, "Error count for %p now %d thresh:%d\n",
105 : (void *)net, net->error_count,
106 : net->failure_threshold);
107 0 : if (net->error_count > net->failure_threshold) {
108 : /* We had a threshold failure */
109 0 : if (net->dest_state & SCTP_ADDR_REACHABLE) {
110 0 : net->dest_state &= ~SCTP_ADDR_REACHABLE;
111 0 : net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
112 0 : net->dest_state &= ~SCTP_ADDR_PF;
113 0 : sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
114 : stcb, 0,
115 : (void *)net, SCTP_SO_NOT_LOCKED);
116 : }
117 0 : } else if ((net->pf_threshold < net->failure_threshold) &&
118 0 : (net->error_count > net->pf_threshold)) {
119 0 : if (!(net->dest_state & SCTP_ADDR_PF)) {
120 0 : net->dest_state |= SCTP_ADDR_PF;
121 0 : net->last_active = sctp_get_tick_count();
122 0 : sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
123 0 : sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_TIMER + SCTP_LOC_3);
124 0 : sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
125 : }
126 : }
127 : }
128 0 : if (stcb == NULL)
129 0 : return (0);
130 :
131 0 : if (net) {
132 0 : if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0) {
133 0 : if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
134 0 : sctp_misc_ints(SCTP_THRESHOLD_INCR,
135 : stcb->asoc.overall_error_count,
136 0 : (stcb->asoc.overall_error_count+1),
137 : SCTP_FROM_SCTP_TIMER,
138 : __LINE__);
139 : }
140 0 : stcb->asoc.overall_error_count++;
141 : }
142 : } else {
143 0 : if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
144 0 : sctp_misc_ints(SCTP_THRESHOLD_INCR,
145 : stcb->asoc.overall_error_count,
146 0 : (stcb->asoc.overall_error_count+1),
147 : SCTP_FROM_SCTP_TIMER,
148 : __LINE__);
149 : }
150 0 : stcb->asoc.overall_error_count++;
151 : }
152 0 : SCTPDBG(SCTP_DEBUG_TIMER4, "Overall error count for %p now %d thresh:%u state:%x\n",
153 : (void *)&stcb->asoc, stcb->asoc.overall_error_count,
154 : (uint32_t)threshold,
155 : ((net == NULL) ? (uint32_t) 0 : (uint32_t) net->dest_state));
156 : /*
157 : * We specifically do not do >= to give the assoc one more change
158 : * before we fail it.
159 : */
160 0 : if (stcb->asoc.overall_error_count > threshold) {
161 : /* Abort notification sends a ULP notify */
162 : struct mbuf *op_err;
163 :
164 0 : op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION,
165 : "Association error counter exceeded");
166 0 : inp->last_abort_code = SCTP_FROM_SCTP_TIMER+SCTP_LOC_1;
167 0 : sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED);
168 0 : return (1);
169 : }
170 0 : return (0);
171 : }
172 :
173 : /*
174 : * sctp_find_alternate_net() returns a non-NULL pointer as long
175 : * the argument net is non-NULL.
176 : */
177 : struct sctp_nets *
178 0 : sctp_find_alternate_net(struct sctp_tcb *stcb,
179 : struct sctp_nets *net,
180 : int mode)
181 : {
182 : /* Find and return an alternate network if possible */
183 0 : struct sctp_nets *alt, *mnet, *min_errors_net = NULL , *max_cwnd_net = NULL;
184 : int once;
185 : /* JRS 5/14/07 - Initialize min_errors to an impossible value. */
186 0 : int min_errors = -1;
187 0 : uint32_t max_cwnd = 0;
188 :
189 0 : if (stcb->asoc.numnets == 1) {
190 : /* No others but net */
191 0 : return (TAILQ_FIRST(&stcb->asoc.nets));
192 : }
193 : /*
194 : * JRS 5/14/07 - If mode is set to 2, use the CMT PF find alternate net algorithm.
195 : * This algorithm chooses the active destination (not in PF state) with the largest
196 : * cwnd value. If all destinations are in PF state, unreachable, or unconfirmed, choose
197 : * the desination that is in PF state with the lowest error count. In case of a tie,
198 : * choose the destination that was most recently active.
199 : */
200 0 : if (mode == 2) {
201 0 : TAILQ_FOREACH(mnet, &stcb->asoc.nets, sctp_next) {
202 : /* JRS 5/14/07 - If the destination is unreachable or unconfirmed, skip it. */
203 0 : if (((mnet->dest_state & SCTP_ADDR_REACHABLE) != SCTP_ADDR_REACHABLE) ||
204 0 : (mnet->dest_state & SCTP_ADDR_UNCONFIRMED)) {
205 0 : continue;
206 : }
207 : /*
208 : * JRS 5/14/07 - If the destination is reachable but in PF state, compare
209 : * the error count of the destination to the minimum error count seen thus far.
210 : * Store the destination with the lower error count. If the error counts are
211 : * equal, store the destination that was most recently active.
212 : */
213 0 : if (mnet->dest_state & SCTP_ADDR_PF) {
214 : /*
215 : * JRS 5/14/07 - If the destination under consideration is the current
216 : * destination, work as if the error count is one higher. The
217 : * actual error count will not be incremented until later in the
218 : * t3 handler.
219 : */
220 0 : if (mnet == net) {
221 0 : if (min_errors == -1) {
222 0 : min_errors = mnet->error_count + 1;
223 0 : min_errors_net = mnet;
224 0 : } else if (mnet->error_count + 1 < min_errors) {
225 0 : min_errors = mnet->error_count + 1;
226 0 : min_errors_net = mnet;
227 0 : } else if (mnet->error_count + 1 == min_errors
228 0 : && mnet->last_active > min_errors_net->last_active) {
229 0 : min_errors_net = mnet;
230 0 : min_errors = mnet->error_count + 1;
231 : }
232 0 : continue;
233 : } else {
234 0 : if (min_errors == -1) {
235 0 : min_errors = mnet->error_count;
236 0 : min_errors_net = mnet;
237 0 : } else if (mnet->error_count < min_errors) {
238 0 : min_errors = mnet->error_count;
239 0 : min_errors_net = mnet;
240 0 : } else if (mnet->error_count == min_errors
241 0 : && mnet->last_active > min_errors_net->last_active) {
242 0 : min_errors_net = mnet;
243 0 : min_errors = mnet->error_count;
244 : }
245 0 : continue;
246 : }
247 : }
248 : /*
249 : * JRS 5/14/07 - If the destination is reachable and not in PF state, compare the
250 : * cwnd of the destination to the highest cwnd seen thus far. Store the
251 : * destination with the higher cwnd value. If the cwnd values are equal,
252 : * randomly choose one of the two destinations.
253 : */
254 0 : if (max_cwnd < mnet->cwnd) {
255 0 : max_cwnd_net = mnet;
256 0 : max_cwnd = mnet->cwnd;
257 0 : } else if (max_cwnd == mnet->cwnd) {
258 : uint32_t rndval;
259 : uint8_t this_random;
260 :
261 0 : if (stcb->asoc.hb_random_idx > 3) {
262 0 : rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
263 0 : memcpy(stcb->asoc.hb_random_values, &rndval, sizeof(stcb->asoc.hb_random_values));
264 0 : this_random = stcb->asoc.hb_random_values[0];
265 0 : stcb->asoc.hb_random_idx++;
266 0 : stcb->asoc.hb_ect_randombit = 0;
267 : } else {
268 0 : this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
269 0 : stcb->asoc.hb_random_idx++;
270 0 : stcb->asoc.hb_ect_randombit = 0;
271 : }
272 0 : if (this_random % 2 == 1) {
273 0 : max_cwnd_net = mnet;
274 0 : max_cwnd = mnet->cwnd; /* Useless? */
275 : }
276 : }
277 : }
278 0 : if (max_cwnd_net == NULL) {
279 0 : if (min_errors_net == NULL) {
280 0 : return (net);
281 : }
282 0 : return (min_errors_net);
283 : } else {
284 0 : return (max_cwnd_net);
285 : }
286 : } /* JRS 5/14/07 - If mode is set to 1, use the CMT policy for choosing an alternate net. */
287 0 : else if (mode == 1) {
288 0 : TAILQ_FOREACH(mnet, &stcb->asoc.nets, sctp_next) {
289 0 : if (((mnet->dest_state & SCTP_ADDR_REACHABLE) != SCTP_ADDR_REACHABLE) ||
290 0 : (mnet->dest_state & SCTP_ADDR_UNCONFIRMED)) {
291 : /*
292 : * will skip ones that are not-reachable or
293 : * unconfirmed
294 : */
295 0 : continue;
296 : }
297 0 : if (max_cwnd < mnet->cwnd) {
298 0 : max_cwnd_net = mnet;
299 0 : max_cwnd = mnet->cwnd;
300 0 : } else if (max_cwnd == mnet->cwnd) {
301 : uint32_t rndval;
302 : uint8_t this_random;
303 :
304 0 : if (stcb->asoc.hb_random_idx > 3) {
305 0 : rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
306 0 : memcpy(stcb->asoc.hb_random_values, &rndval,
307 : sizeof(stcb->asoc.hb_random_values));
308 0 : this_random = stcb->asoc.hb_random_values[0];
309 0 : stcb->asoc.hb_random_idx = 0;
310 0 : stcb->asoc.hb_ect_randombit = 0;
311 : } else {
312 0 : this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
313 0 : stcb->asoc.hb_random_idx++;
314 0 : stcb->asoc.hb_ect_randombit = 0;
315 : }
316 0 : if (this_random % 2) {
317 0 : max_cwnd_net = mnet;
318 0 : max_cwnd = mnet->cwnd;
319 : }
320 : }
321 : }
322 0 : if (max_cwnd_net) {
323 0 : return (max_cwnd_net);
324 : }
325 : }
326 0 : mnet = net;
327 0 : once = 0;
328 :
329 0 : if (mnet == NULL) {
330 0 : mnet = TAILQ_FIRST(&stcb->asoc.nets);
331 0 : if (mnet == NULL) {
332 0 : return (NULL);
333 : }
334 : }
335 : for (;;) {
336 0 : alt = TAILQ_NEXT(mnet, sctp_next);
337 0 : if (alt == NULL) {
338 0 : once++;
339 0 : if (once > 1) {
340 0 : break;
341 : }
342 0 : alt = TAILQ_FIRST(&stcb->asoc.nets);
343 0 : if (alt == NULL) {
344 0 : return (NULL);
345 : }
346 : }
347 0 : if (alt->ro.ro_rt == NULL) {
348 0 : if (alt->ro._s_addr) {
349 0 : sctp_free_ifa(alt->ro._s_addr);
350 0 : alt->ro._s_addr = NULL;
351 : }
352 0 : alt->src_addr_selected = 0;
353 : }
354 0 : if (((alt->dest_state & SCTP_ADDR_REACHABLE) == SCTP_ADDR_REACHABLE) &&
355 0 : (alt->ro.ro_rt != NULL) &&
356 0 : (!(alt->dest_state & SCTP_ADDR_UNCONFIRMED))) {
357 : /* Found a reachable address */
358 0 : break;
359 : }
360 0 : mnet = alt;
361 : }
362 :
363 0 : if (alt == NULL) {
364 : /* Case where NO insv network exists (dormant state) */
365 : /* we rotate destinations */
366 0 : once = 0;
367 0 : mnet = net;
368 : for (;;) {
369 0 : if (mnet == NULL) {
370 0 : return (TAILQ_FIRST(&stcb->asoc.nets));
371 : }
372 0 : alt = TAILQ_NEXT(mnet, sctp_next);
373 0 : if (alt == NULL) {
374 0 : once++;
375 0 : if (once > 1) {
376 0 : break;
377 : }
378 0 : alt = TAILQ_FIRST(&stcb->asoc.nets);
379 0 : if (alt == NULL) {
380 0 : break;
381 : }
382 : }
383 0 : if ((!(alt->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
384 : (alt != net)) {
385 : /* Found an alternate address */
386 0 : break;
387 : }
388 0 : mnet = alt;
389 : }
390 : }
391 0 : if (alt == NULL) {
392 0 : return (net);
393 : }
394 0 : return (alt);
395 : }
396 :
397 : static void
398 0 : sctp_backoff_on_timeout(struct sctp_tcb *stcb,
399 : struct sctp_nets *net,
400 : int win_probe,
401 : int num_marked, int num_abandoned)
402 : {
403 0 : if (net->RTO == 0) {
404 0 : net->RTO = stcb->asoc.minrto;
405 : }
406 0 : net->RTO <<= 1;
407 0 : if (net->RTO > stcb->asoc.maxrto) {
408 0 : net->RTO = stcb->asoc.maxrto;
409 : }
410 0 : if ((win_probe == 0) && (num_marked || num_abandoned)) {
411 : /* We don't apply penalty to window probe scenarios */
412 : /* JRS - Use the congestion control given in the CC module */
413 0 : stcb->asoc.cc_functions.sctp_cwnd_update_after_timeout(stcb, net);
414 : }
415 0 : }
416 :
417 : #ifndef INVARIANTS
418 : static void
419 0 : sctp_recover_sent_list(struct sctp_tcb *stcb)
420 : {
421 : struct sctp_tmit_chunk *chk, *nchk;
422 : struct sctp_association *asoc;
423 :
424 0 : asoc = &stcb->asoc;
425 0 : TAILQ_FOREACH_SAFE(chk, &asoc->sent_queue, sctp_next, nchk) {
426 0 : if (SCTP_TSN_GE(asoc->last_acked_seq, chk->rec.data.TSN_seq)) {
427 0 : SCTP_PRINTF("Found chk:%p tsn:%x <= last_acked_seq:%x\n",
428 : (void *)chk, chk->rec.data.TSN_seq, asoc->last_acked_seq);
429 0 : if (chk->sent != SCTP_DATAGRAM_NR_ACKED) {
430 0 : if (asoc->strmout[chk->rec.data.stream_number].chunks_on_queues > 0) {
431 0 : asoc->strmout[chk->rec.data.stream_number].chunks_on_queues--;
432 : }
433 : }
434 0 : TAILQ_REMOVE(&asoc->sent_queue, chk, sctp_next);
435 0 : if (PR_SCTP_ENABLED(chk->flags)) {
436 0 : if (asoc->pr_sctp_cnt != 0)
437 0 : asoc->pr_sctp_cnt--;
438 : }
439 0 : if (chk->data) {
440 : /*sa_ignore NO_NULL_CHK*/
441 0 : sctp_free_bufspace(stcb, asoc, chk, 1);
442 0 : sctp_m_freem(chk->data);
443 0 : chk->data = NULL;
444 0 : if (asoc->prsctp_supported && PR_SCTP_BUF_ENABLED(chk->flags)) {
445 0 : asoc->sent_queue_cnt_removeable--;
446 : }
447 : }
448 0 : asoc->sent_queue_cnt--;
449 0 : sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
450 : }
451 : }
452 0 : SCTP_PRINTF("after recover order is as follows\n");
453 0 : TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
454 0 : SCTP_PRINTF("chk:%p TSN:%x\n", (void *)chk, chk->rec.data.TSN_seq);
455 : }
456 0 : }
457 : #endif
458 :
459 : static int
460 0 : sctp_mark_all_for_resend(struct sctp_tcb *stcb,
461 : struct sctp_nets *net,
462 : struct sctp_nets *alt,
463 : int window_probe,
464 : int *num_marked,
465 : int *num_abandoned)
466 : {
467 :
468 : /*
469 : * Mark all chunks (well not all) that were sent to *net for
470 : * retransmission. Move them to alt for there destination as well...
471 : * We only mark chunks that have been outstanding long enough to
472 : * have received feed-back.
473 : */
474 : struct sctp_tmit_chunk *chk, *nchk;
475 : struct sctp_nets *lnets;
476 : struct timeval now, min_wait, tv;
477 : int cur_rto;
478 : int cnt_abandoned;
479 : int audit_tf, num_mk, fir;
480 : unsigned int cnt_mk;
481 : uint32_t orig_flight, orig_tf;
482 : uint32_t tsnlast, tsnfirst;
483 0 : int recovery_cnt = 0;
484 :
485 :
486 : /* none in flight now */
487 0 : audit_tf = 0;
488 0 : fir = 0;
489 : /*
490 : * figure out how long a data chunk must be pending before we can
491 : * mark it ..
492 : */
493 0 : (void)SCTP_GETTIME_TIMEVAL(&now);
494 : /* get cur rto in micro-seconds */
495 0 : cur_rto = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv;
496 0 : cur_rto *= 1000;
497 0 : if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
498 0 : sctp_log_fr(cur_rto,
499 : stcb->asoc.peers_rwnd,
500 : window_probe,
501 : SCTP_FR_T3_MARK_TIME);
502 0 : sctp_log_fr(net->flight_size, 0, 0, SCTP_FR_CWND_REPORT);
503 0 : sctp_log_fr(net->flight_size, net->cwnd, stcb->asoc.total_flight, SCTP_FR_CWND_REPORT);
504 : }
505 0 : tv.tv_sec = cur_rto / 1000000;
506 0 : tv.tv_usec = cur_rto % 1000000;
507 : #ifndef __FreeBSD__
508 0 : timersub(&now, &tv, &min_wait);
509 : #else
510 : min_wait = now;
511 : timevalsub(&min_wait, &tv);
512 : #endif
513 0 : if (min_wait.tv_sec < 0 || min_wait.tv_usec < 0) {
514 : /*
515 : * if we hit here, we don't have enough seconds on the clock
516 : * to account for the RTO. We just let the lower seconds be
517 : * the bounds and don't worry about it. This may mean we
518 : * will mark a lot more than we should.
519 : */
520 0 : min_wait.tv_sec = min_wait.tv_usec = 0;
521 : }
522 0 : if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
523 0 : sctp_log_fr(cur_rto, now.tv_sec, now.tv_usec, SCTP_FR_T3_MARK_TIME);
524 0 : sctp_log_fr(0, min_wait.tv_sec, min_wait.tv_usec, SCTP_FR_T3_MARK_TIME);
525 : }
526 : /*
527 : * Our rwnd will be incorrect here since we are not adding back the
528 : * cnt * mbuf but we will fix that down below.
529 : */
530 0 : orig_flight = net->flight_size;
531 0 : orig_tf = stcb->asoc.total_flight;
532 :
533 0 : net->fast_retran_ip = 0;
534 : /* Now on to each chunk */
535 0 : cnt_abandoned = 0;
536 0 : num_mk = cnt_mk = 0;
537 0 : tsnfirst = tsnlast = 0;
538 : #ifndef INVARIANTS
539 : start_again:
540 : #endif
541 0 : TAILQ_FOREACH_SAFE(chk, &stcb->asoc.sent_queue, sctp_next, nchk) {
542 0 : if (SCTP_TSN_GE(stcb->asoc.last_acked_seq, chk->rec.data.TSN_seq)) {
543 : /* Strange case our list got out of order? */
544 0 : SCTP_PRINTF("Our list is out of order? last_acked:%x chk:%x\n",
545 : (unsigned int)stcb->asoc.last_acked_seq, (unsigned int)chk->rec.data.TSN_seq);
546 0 : recovery_cnt++;
547 : #ifdef INVARIANTS
548 : panic("last acked >= chk on sent-Q");
549 : #else
550 0 : SCTP_PRINTF("Recover attempts a restart cnt:%d\n", recovery_cnt);
551 0 : sctp_recover_sent_list(stcb);
552 0 : if (recovery_cnt < 10) {
553 0 : goto start_again;
554 : } else {
555 0 : SCTP_PRINTF("Recovery fails %d times??\n", recovery_cnt);
556 : }
557 : #endif
558 : }
559 0 : if ((chk->whoTo == net) && (chk->sent < SCTP_DATAGRAM_ACKED)) {
560 : /*
561 : * found one to mark: If it is less than
562 : * DATAGRAM_ACKED it MUST not be a skipped or marked
563 : * TSN but instead one that is either already set
564 : * for retransmission OR one that needs
565 : * retransmission.
566 : */
567 :
568 : /* validate its been outstanding long enough */
569 0 : if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
570 0 : sctp_log_fr(chk->rec.data.TSN_seq,
571 0 : chk->sent_rcv_time.tv_sec,
572 0 : chk->sent_rcv_time.tv_usec,
573 : SCTP_FR_T3_MARK_TIME);
574 : }
575 0 : if ((chk->sent_rcv_time.tv_sec > min_wait.tv_sec) && (window_probe == 0)) {
576 : /*
577 : * we have reached a chunk that was sent
578 : * some seconds past our min.. forget it we
579 : * will find no more to send.
580 : */
581 0 : if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
582 0 : sctp_log_fr(0,
583 0 : chk->sent_rcv_time.tv_sec,
584 0 : chk->sent_rcv_time.tv_usec,
585 : SCTP_FR_T3_STOPPED);
586 : }
587 0 : continue;
588 0 : } else if ((chk->sent_rcv_time.tv_sec == min_wait.tv_sec) &&
589 : (window_probe == 0)) {
590 : /*
591 : * we must look at the micro seconds to
592 : * know.
593 : */
594 0 : if (chk->sent_rcv_time.tv_usec >= min_wait.tv_usec) {
595 : /*
596 : * ok it was sent after our boundary
597 : * time.
598 : */
599 0 : continue;
600 : }
601 : }
602 0 : if (stcb->asoc.prsctp_supported && PR_SCTP_TTL_ENABLED(chk->flags)) {
603 : /* Is it expired? */
604 : #ifndef __FreeBSD__
605 0 : if (timercmp(&now, &chk->rec.data.timetodrop, >)) {
606 : #else
607 : if (timevalcmp(&now, &chk->rec.data.timetodrop, >)) {
608 : #endif
609 : /* Yes so drop it */
610 0 : if (chk->data) {
611 0 : (void)sctp_release_pr_sctp_chunk(stcb,
612 : chk,
613 : 1,
614 : SCTP_SO_NOT_LOCKED);
615 0 : cnt_abandoned++;
616 : }
617 0 : continue;
618 : }
619 : }
620 0 : if (stcb->asoc.prsctp_supported && PR_SCTP_RTX_ENABLED(chk->flags)) {
621 : /* Has it been retransmitted tv_sec times? */
622 0 : if (chk->snd_count > chk->rec.data.timetodrop.tv_sec) {
623 0 : if (chk->data) {
624 0 : (void)sctp_release_pr_sctp_chunk(stcb,
625 : chk,
626 : 1,
627 : SCTP_SO_NOT_LOCKED);
628 0 : cnt_abandoned++;
629 : }
630 0 : continue;
631 : }
632 : }
633 0 : if (chk->sent < SCTP_DATAGRAM_RESEND) {
634 0 : sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
635 0 : num_mk++;
636 0 : if (fir == 0) {
637 0 : fir = 1;
638 0 : tsnfirst = chk->rec.data.TSN_seq;
639 : }
640 0 : tsnlast = chk->rec.data.TSN_seq;
641 0 : if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
642 0 : sctp_log_fr(chk->rec.data.TSN_seq, chk->snd_count,
643 : 0, SCTP_FR_T3_MARKED);
644 : }
645 :
646 0 : if (chk->rec.data.chunk_was_revoked) {
647 : /* deflate the cwnd */
648 0 : chk->whoTo->cwnd -= chk->book_size;
649 0 : chk->rec.data.chunk_was_revoked = 0;
650 : }
651 0 : net->marked_retrans++;
652 0 : stcb->asoc.marked_retrans++;
653 0 : if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
654 0 : sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_RSND_TO,
655 0 : chk->whoTo->flight_size,
656 0 : chk->book_size,
657 0 : (uintptr_t)chk->whoTo,
658 : chk->rec.data.TSN_seq);
659 : }
660 0 : sctp_flight_size_decrease(chk);
661 0 : sctp_total_flight_decrease(stcb, chk);
662 0 : stcb->asoc.peers_rwnd += chk->send_size;
663 0 : stcb->asoc.peers_rwnd += SCTP_BASE_SYSCTL(sctp_peer_chunk_oh);
664 : }
665 0 : chk->sent = SCTP_DATAGRAM_RESEND;
666 0 : SCTP_STAT_INCR(sctps_markedretrans);
667 :
668 : /* reset the TSN for striking and other FR stuff */
669 0 : chk->rec.data.doing_fast_retransmit = 0;
670 : /* Clear any time so NO RTT is being done */
671 :
672 0 : if (chk->do_rtt) {
673 0 : if (chk->whoTo->rto_needed == 0) {
674 0 : chk->whoTo->rto_needed = 1;
675 : }
676 : }
677 0 : chk->do_rtt = 0;
678 0 : if (alt != net) {
679 0 : sctp_free_remote_addr(chk->whoTo);
680 0 : chk->no_fr_allowed = 1;
681 0 : chk->whoTo = alt;
682 0 : atomic_add_int(&alt->ref_count, 1);
683 : } else {
684 0 : chk->no_fr_allowed = 0;
685 0 : if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
686 0 : chk->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
687 : } else {
688 0 : chk->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
689 : }
690 : }
691 : /* CMT: Do not allow FRs on retransmitted TSNs.
692 : */
693 0 : if (stcb->asoc.sctp_cmt_on_off > 0) {
694 0 : chk->no_fr_allowed = 1;
695 : }
696 : #ifdef THIS_SHOULD_NOT_BE_DONE
697 : } else if (chk->sent == SCTP_DATAGRAM_ACKED) {
698 : /* remember highest acked one */
699 : could_be_sent = chk;
700 : #endif
701 : }
702 0 : if (chk->sent == SCTP_DATAGRAM_RESEND) {
703 0 : cnt_mk++;
704 : }
705 : }
706 0 : if ((orig_flight - net->flight_size) != (orig_tf - stcb->asoc.total_flight)) {
707 : /* we did not subtract the same things? */
708 0 : audit_tf = 1;
709 : }
710 :
711 0 : if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
712 0 : sctp_log_fr(tsnfirst, tsnlast, num_mk, SCTP_FR_T3_TIMEOUT);
713 : }
714 : #ifdef SCTP_DEBUG
715 0 : if (num_mk) {
716 0 : SCTPDBG(SCTP_DEBUG_TIMER1, "LAST TSN marked was %x\n",
717 : tsnlast);
718 0 : SCTPDBG(SCTP_DEBUG_TIMER1, "Num marked for retransmission was %d peer-rwd:%ld\n",
719 : num_mk, (u_long)stcb->asoc.peers_rwnd);
720 0 : SCTPDBG(SCTP_DEBUG_TIMER1, "LAST TSN marked was %x\n",
721 : tsnlast);
722 0 : SCTPDBG(SCTP_DEBUG_TIMER1, "Num marked for retransmission was %d peer-rwd:%d\n",
723 : num_mk,
724 : (int)stcb->asoc.peers_rwnd);
725 : }
726 : #endif
727 0 : *num_marked = num_mk;
728 0 : *num_abandoned = cnt_abandoned;
729 : /* Now check for a ECN Echo that may be stranded And
730 : * include the cnt_mk'd to have all resends in the
731 : * control queue.
732 : */
733 0 : TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
734 0 : if (chk->sent == SCTP_DATAGRAM_RESEND) {
735 0 : cnt_mk++;
736 : }
737 0 : if ((chk->whoTo == net) &&
738 0 : (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
739 0 : sctp_free_remote_addr(chk->whoTo);
740 0 : chk->whoTo = alt;
741 0 : if (chk->sent != SCTP_DATAGRAM_RESEND) {
742 0 : chk->sent = SCTP_DATAGRAM_RESEND;
743 0 : sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
744 0 : cnt_mk++;
745 : }
746 0 : atomic_add_int(&alt->ref_count, 1);
747 : }
748 : }
749 : #ifdef THIS_SHOULD_NOT_BE_DONE
750 : if ((stcb->asoc.sent_queue_retran_cnt == 0) && (could_be_sent)) {
751 : /* fix it so we retransmit the highest acked anyway */
752 : sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
753 : cnt_mk++;
754 : could_be_sent->sent = SCTP_DATAGRAM_RESEND;
755 : }
756 : #endif
757 0 : if (stcb->asoc.sent_queue_retran_cnt != cnt_mk) {
758 : #ifdef INVARIANTS
759 : SCTP_PRINTF("Local Audit says there are %d for retran asoc cnt:%d we marked:%d this time\n",
760 : cnt_mk, stcb->asoc.sent_queue_retran_cnt, num_mk);
761 : #endif
762 : #ifndef SCTP_AUDITING_ENABLED
763 0 : stcb->asoc.sent_queue_retran_cnt = cnt_mk;
764 : #endif
765 : }
766 0 : if (audit_tf) {
767 0 : SCTPDBG(SCTP_DEBUG_TIMER4,
768 : "Audit total flight due to negative value net:%p\n",
769 : (void *)net);
770 0 : stcb->asoc.total_flight = 0;
771 0 : stcb->asoc.total_flight_count = 0;
772 : /* Clear all networks flight size */
773 0 : TAILQ_FOREACH(lnets, &stcb->asoc.nets, sctp_next) {
774 0 : lnets->flight_size = 0;
775 0 : SCTPDBG(SCTP_DEBUG_TIMER4,
776 : "Net:%p c-f cwnd:%d ssthresh:%d\n",
777 : (void *)lnets, lnets->cwnd, lnets->ssthresh);
778 : }
779 0 : TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
780 0 : if (chk->sent < SCTP_DATAGRAM_RESEND) {
781 0 : if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
782 0 : sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
783 0 : chk->whoTo->flight_size,
784 0 : chk->book_size,
785 0 : (uintptr_t)chk->whoTo,
786 : chk->rec.data.TSN_seq);
787 : }
788 :
789 0 : sctp_flight_size_increase(chk);
790 0 : sctp_total_flight_increase(stcb, chk);
791 : }
792 : }
793 : }
794 : /* We return 1 if we only have a window probe outstanding */
795 0 : return (0);
796 : }
797 :
798 :
799 : int
800 0 : sctp_t3rxt_timer(struct sctp_inpcb *inp,
801 : struct sctp_tcb *stcb,
802 : struct sctp_nets *net)
803 : {
804 : struct sctp_nets *alt;
805 : int win_probe, num_mk, num_abandoned;
806 :
807 0 : if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
808 0 : sctp_log_fr(0, 0, 0, SCTP_FR_T3_TIMEOUT);
809 : }
810 0 : if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
811 : struct sctp_nets *lnet;
812 :
813 0 : TAILQ_FOREACH(lnet, &stcb->asoc.nets, sctp_next) {
814 0 : if (net == lnet) {
815 0 : sctp_log_cwnd(stcb, lnet, 1, SCTP_CWND_LOG_FROM_T3);
816 : } else {
817 0 : sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_LOG_FROM_T3);
818 : }
819 : }
820 : }
821 : /* Find an alternate and mark those for retransmission */
822 0 : if ((stcb->asoc.peers_rwnd == 0) &&
823 0 : (stcb->asoc.total_flight < net->mtu)) {
824 0 : SCTP_STAT_INCR(sctps_timowindowprobe);
825 0 : win_probe = 1;
826 : } else {
827 0 : win_probe = 0;
828 : }
829 :
830 0 : if (win_probe == 0) {
831 : /* We don't do normal threshold management on window probes */
832 0 : if (sctp_threshold_management(inp, stcb, net,
833 0 : stcb->asoc.max_send_times)) {
834 : /* Association was destroyed */
835 0 : return (1);
836 : } else {
837 0 : if (net != stcb->asoc.primary_destination) {
838 : /* send a immediate HB if our RTO is stale */
839 : struct timeval now;
840 : unsigned int ms_goneby;
841 :
842 0 : (void)SCTP_GETTIME_TIMEVAL(&now);
843 0 : if (net->last_sent_time.tv_sec) {
844 0 : ms_goneby = (now.tv_sec - net->last_sent_time.tv_sec) * 1000;
845 : } else {
846 0 : ms_goneby = 0;
847 : }
848 0 : if ((net->dest_state & SCTP_ADDR_PF) == 0) {
849 0 : if ((ms_goneby > net->RTO) || (net->RTO == 0)) {
850 : /*
851 : * no recent feed back in an RTO or
852 : * more, request a RTT update
853 : */
854 0 : sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
855 : }
856 : }
857 : }
858 : }
859 : } else {
860 : /*
861 : * For a window probe we don't penalize the net's but only
862 : * the association. This may fail it if SACKs are not coming
863 : * back. If sack's are coming with rwnd locked at 0, we will
864 : * continue to hold things waiting for rwnd to raise
865 : */
866 0 : if (sctp_threshold_management(inp, stcb, NULL,
867 0 : stcb->asoc.max_send_times)) {
868 : /* Association was destroyed */
869 0 : return (1);
870 : }
871 : }
872 0 : if (stcb->asoc.sctp_cmt_on_off > 0) {
873 0 : if (net->pf_threshold < net->failure_threshold) {
874 0 : alt = sctp_find_alternate_net(stcb, net, 2);
875 : } else {
876 : /*
877 : * CMT: Using RTX_SSTHRESH policy for CMT.
878 : * If CMT is being used, then pick dest with
879 : * largest ssthresh for any retransmission.
880 : */
881 0 : alt = sctp_find_alternate_net(stcb, net, 1);
882 : /*
883 : * CUCv2: If a different dest is picked for
884 : * the retransmission, then new
885 : * (rtx-)pseudo_cumack needs to be tracked
886 : * for orig dest. Let CUCv2 track new (rtx-)
887 : * pseudo-cumack always.
888 : */
889 0 : net->find_pseudo_cumack = 1;
890 0 : net->find_rtx_pseudo_cumack = 1;
891 : }
892 : } else {
893 0 : alt = sctp_find_alternate_net(stcb, net, 0);
894 : }
895 :
896 0 : num_mk = 0;
897 0 : num_abandoned = 0;
898 0 : (void)sctp_mark_all_for_resend(stcb, net, alt, win_probe,
899 : &num_mk, &num_abandoned);
900 : /* FR Loss recovery just ended with the T3. */
901 0 : stcb->asoc.fast_retran_loss_recovery = 0;
902 :
903 : /* CMT FR loss recovery ended with the T3 */
904 0 : net->fast_retran_loss_recovery = 0;
905 0 : if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
906 0 : (net->flight_size == 0)) {
907 0 : (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins)(stcb, net);
908 : }
909 :
910 : /*
911 : * setup the sat loss recovery that prevents satellite cwnd advance.
912 : */
913 0 : stcb->asoc.sat_t3_loss_recovery = 1;
914 0 : stcb->asoc.sat_t3_recovery_tsn = stcb->asoc.sending_seq;
915 :
916 : /* Backoff the timer and cwnd */
917 0 : sctp_backoff_on_timeout(stcb, net, win_probe, num_mk, num_abandoned);
918 0 : if ((!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
919 0 : (net->dest_state & SCTP_ADDR_PF)) {
920 : /* Move all pending over too */
921 0 : sctp_move_chunks_from_net(stcb, net);
922 :
923 : /* Get the address that failed, to
924 : * force a new src address selecton and
925 : * a route allocation.
926 : */
927 0 : if (net->ro._s_addr) {
928 0 : sctp_free_ifa(net->ro._s_addr);
929 0 : net->ro._s_addr = NULL;
930 : }
931 0 : net->src_addr_selected = 0;
932 :
933 : /* Force a route allocation too */
934 0 : if (net->ro.ro_rt) {
935 0 : RTFREE(net->ro.ro_rt);
936 0 : net->ro.ro_rt = NULL;
937 : }
938 :
939 : /* Was it our primary? */
940 0 : if ((stcb->asoc.primary_destination == net) && (alt != net)) {
941 : /*
942 : * Yes, note it as such and find an alternate note:
943 : * this means HB code must use this to resent the
944 : * primary if it goes active AND if someone does a
945 : * change-primary then this flag must be cleared
946 : * from any net structures.
947 : */
948 0 : if (stcb->asoc.alternate) {
949 0 : sctp_free_remote_addr(stcb->asoc.alternate);
950 : }
951 0 : stcb->asoc.alternate = alt;
952 0 : atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
953 : }
954 : }
955 : /*
956 : * Special case for cookie-echo'ed case, we don't do output but must
957 : * await the COOKIE-ACK before retransmission
958 : */
959 0 : if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
960 : /*
961 : * Here we just reset the timer and start again since we
962 : * have not established the asoc
963 : */
964 0 : sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
965 0 : return (0);
966 : }
967 0 : if (stcb->asoc.prsctp_supported) {
968 : struct sctp_tmit_chunk *lchk;
969 :
970 0 : lchk = sctp_try_advance_peer_ack_point(stcb, &stcb->asoc);
971 : /* C3. See if we need to send a Fwd-TSN */
972 0 : if (SCTP_TSN_GT(stcb->asoc.advanced_peer_ack_point, stcb->asoc.last_acked_seq)) {
973 0 : send_forward_tsn(stcb, &stcb->asoc);
974 0 : if (lchk) {
975 : /* Assure a timer is up */
976 0 : sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, lchk->whoTo);
977 : }
978 : }
979 : }
980 0 : if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
981 0 : sctp_log_cwnd(stcb, net, net->cwnd, SCTP_CWND_LOG_FROM_RTX);
982 : }
983 0 : return (0);
984 : }
985 :
986 : int
987 0 : sctp_t1init_timer(struct sctp_inpcb *inp,
988 : struct sctp_tcb *stcb,
989 : struct sctp_nets *net)
990 : {
991 : /* bump the thresholds */
992 0 : if (stcb->asoc.delayed_connection) {
993 : /*
994 : * special hook for delayed connection. The library did NOT
995 : * complete the rest of its sends.
996 : */
997 0 : stcb->asoc.delayed_connection = 0;
998 0 : sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
999 0 : return (0);
1000 : }
1001 0 : if (SCTP_GET_STATE((&stcb->asoc)) != SCTP_STATE_COOKIE_WAIT) {
1002 0 : return (0);
1003 : }
1004 0 : if (sctp_threshold_management(inp, stcb, net,
1005 0 : stcb->asoc.max_init_times)) {
1006 : /* Association was destroyed */
1007 0 : return (1);
1008 : }
1009 0 : stcb->asoc.dropped_special_cnt = 0;
1010 0 : sctp_backoff_on_timeout(stcb, stcb->asoc.primary_destination, 1, 0, 0);
1011 0 : if (stcb->asoc.initial_init_rto_max < net->RTO) {
1012 0 : net->RTO = stcb->asoc.initial_init_rto_max;
1013 : }
1014 0 : if (stcb->asoc.numnets > 1) {
1015 : /* If we have more than one addr use it */
1016 : struct sctp_nets *alt;
1017 :
1018 0 : alt = sctp_find_alternate_net(stcb, stcb->asoc.primary_destination, 0);
1019 0 : if (alt != stcb->asoc.primary_destination) {
1020 0 : sctp_move_chunks_from_net(stcb, stcb->asoc.primary_destination);
1021 0 : stcb->asoc.primary_destination = alt;
1022 : }
1023 : }
1024 : /* Send out a new init */
1025 0 : sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
1026 0 : return (0);
1027 : }
1028 :
1029 : /*
1030 : * For cookie and asconf we actually need to find and mark for resend, then
1031 : * increment the resend counter (after all the threshold management stuff of
1032 : * course).
1033 : */
1034 : int
1035 0 : sctp_cookie_timer(struct sctp_inpcb *inp,
1036 : struct sctp_tcb *stcb,
1037 : struct sctp_nets *net SCTP_UNUSED)
1038 : {
1039 : struct sctp_nets *alt;
1040 : struct sctp_tmit_chunk *cookie;
1041 :
1042 : /* first before all else we must find the cookie */
1043 0 : TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, sctp_next) {
1044 0 : if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
1045 0 : break;
1046 : }
1047 : }
1048 0 : if (cookie == NULL) {
1049 0 : if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
1050 : /* FOOBAR! */
1051 : struct mbuf *op_err;
1052 :
1053 0 : op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION,
1054 : "Cookie timer expired, but no cookie");
1055 0 : inp->last_abort_code = SCTP_FROM_SCTP_TIMER+SCTP_LOC_4;
1056 0 : sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED);
1057 : } else {
1058 : #ifdef INVARIANTS
1059 : panic("Cookie timer expires in wrong state?");
1060 : #else
1061 0 : SCTP_PRINTF("Strange in state %d not cookie-echoed yet c-e timer expires?\n", SCTP_GET_STATE(&stcb->asoc));
1062 0 : return (0);
1063 : #endif
1064 : }
1065 0 : return (0);
1066 : }
1067 : /* Ok we found the cookie, threshold management next */
1068 0 : if (sctp_threshold_management(inp, stcb, cookie->whoTo,
1069 0 : stcb->asoc.max_init_times)) {
1070 : /* Assoc is over */
1071 0 : return (1);
1072 : }
1073 : /*
1074 : * cleared theshold management now lets backoff the address & select
1075 : * an alternate
1076 : */
1077 0 : stcb->asoc.dropped_special_cnt = 0;
1078 0 : sctp_backoff_on_timeout(stcb, cookie->whoTo, 1, 0, 0);
1079 0 : alt = sctp_find_alternate_net(stcb, cookie->whoTo, 0);
1080 0 : if (alt != cookie->whoTo) {
1081 0 : sctp_free_remote_addr(cookie->whoTo);
1082 0 : cookie->whoTo = alt;
1083 0 : atomic_add_int(&alt->ref_count, 1);
1084 : }
1085 : /* Now mark the retran info */
1086 0 : if (cookie->sent != SCTP_DATAGRAM_RESEND) {
1087 0 : sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1088 : }
1089 0 : cookie->sent = SCTP_DATAGRAM_RESEND;
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 0 : return (0);
1096 : }
1097 :
1098 : int
1099 0 : sctp_strreset_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1100 : struct sctp_nets *net)
1101 : {
1102 : struct sctp_nets *alt;
1103 0 : struct sctp_tmit_chunk *strrst = NULL, *chk = NULL;
1104 :
1105 0 : if (stcb->asoc.stream_reset_outstanding == 0) {
1106 0 : return (0);
1107 : }
1108 : /* find the existing STRRESET, we use the seq number we sent out on */
1109 0 : (void)sctp_find_stream_reset(stcb, stcb->asoc.str_reset_seq_out, &strrst);
1110 0 : if (strrst == NULL) {
1111 0 : return (0);
1112 : }
1113 : /* do threshold management */
1114 0 : if (sctp_threshold_management(inp, stcb, strrst->whoTo,
1115 0 : stcb->asoc.max_send_times)) {
1116 : /* Assoc is over */
1117 0 : return (1);
1118 : }
1119 : /*
1120 : * cleared theshold management now lets backoff the address & select
1121 : * an alternate
1122 : */
1123 0 : sctp_backoff_on_timeout(stcb, strrst->whoTo, 1, 0, 0);
1124 0 : alt = sctp_find_alternate_net(stcb, strrst->whoTo, 0);
1125 0 : sctp_free_remote_addr(strrst->whoTo);
1126 0 : strrst->whoTo = alt;
1127 0 : atomic_add_int(&alt->ref_count, 1);
1128 :
1129 : /* See if a ECN Echo is also stranded */
1130 0 : TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
1131 0 : if ((chk->whoTo == net) &&
1132 0 : (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
1133 0 : sctp_free_remote_addr(chk->whoTo);
1134 0 : if (chk->sent != SCTP_DATAGRAM_RESEND) {
1135 0 : chk->sent = SCTP_DATAGRAM_RESEND;
1136 0 : sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1137 : }
1138 0 : chk->whoTo = alt;
1139 0 : atomic_add_int(&alt->ref_count, 1);
1140 : }
1141 : }
1142 0 : if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
1143 : /*
1144 : * If the address went un-reachable, we need to move to
1145 : * alternates for ALL chk's in queue
1146 : */
1147 0 : sctp_move_chunks_from_net(stcb, net);
1148 : }
1149 : /* mark the retran info */
1150 0 : if (strrst->sent != SCTP_DATAGRAM_RESEND)
1151 0 : sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1152 0 : strrst->sent = SCTP_DATAGRAM_RESEND;
1153 :
1154 : /* restart the timer */
1155 0 : sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, inp, stcb, strrst->whoTo);
1156 0 : return (0);
1157 : }
1158 :
1159 : int
1160 0 : sctp_asconf_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1161 : struct sctp_nets *net)
1162 : {
1163 : struct sctp_nets *alt;
1164 : struct sctp_tmit_chunk *asconf, *chk;
1165 :
1166 : /* is this a first send, or a retransmission? */
1167 0 : if (TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) {
1168 : /* compose a new ASCONF chunk and send it */
1169 0 : sctp_send_asconf(stcb, net, SCTP_ADDR_NOT_LOCKED);
1170 : } else {
1171 : /*
1172 : * Retransmission of the existing ASCONF is needed
1173 : */
1174 :
1175 : /* find the existing ASCONF */
1176 0 : asconf = TAILQ_FIRST(&stcb->asoc.asconf_send_queue);
1177 0 : if (asconf == NULL) {
1178 0 : return (0);
1179 : }
1180 : /* do threshold management */
1181 0 : if (sctp_threshold_management(inp, stcb, asconf->whoTo,
1182 0 : stcb->asoc.max_send_times)) {
1183 : /* Assoc is over */
1184 0 : return (1);
1185 : }
1186 0 : if (asconf->snd_count > stcb->asoc.max_send_times) {
1187 : /*
1188 : * Something is rotten: our peer is not responding to
1189 : * ASCONFs but apparently is to other chunks. i.e. it
1190 : * is not properly handling the chunk type upper bits.
1191 : * Mark this peer as ASCONF incapable and cleanup.
1192 : */
1193 0 : SCTPDBG(SCTP_DEBUG_TIMER1, "asconf_timer: Peer has not responded to our repeated ASCONFs\n");
1194 0 : sctp_asconf_cleanup(stcb, net);
1195 0 : return (0);
1196 : }
1197 : /*
1198 : * cleared threshold management, so now backoff the net and
1199 : * select an alternate
1200 : */
1201 0 : sctp_backoff_on_timeout(stcb, asconf->whoTo, 1, 0, 0);
1202 0 : alt = sctp_find_alternate_net(stcb, asconf->whoTo, 0);
1203 0 : if (asconf->whoTo != alt) {
1204 0 : sctp_free_remote_addr(asconf->whoTo);
1205 0 : asconf->whoTo = alt;
1206 0 : atomic_add_int(&alt->ref_count, 1);
1207 : }
1208 :
1209 : /* See if an ECN Echo is also stranded */
1210 0 : TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
1211 0 : if ((chk->whoTo == net) &&
1212 0 : (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
1213 0 : sctp_free_remote_addr(chk->whoTo);
1214 0 : chk->whoTo = alt;
1215 0 : if (chk->sent != SCTP_DATAGRAM_RESEND) {
1216 0 : chk->sent = SCTP_DATAGRAM_RESEND;
1217 0 : sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1218 : }
1219 0 : atomic_add_int(&alt->ref_count, 1);
1220 : }
1221 : }
1222 0 : TAILQ_FOREACH(chk, &stcb->asoc.asconf_send_queue, sctp_next) {
1223 0 : if (chk->whoTo != alt) {
1224 0 : sctp_free_remote_addr(chk->whoTo);
1225 0 : chk->whoTo = alt;
1226 0 : atomic_add_int(&alt->ref_count, 1);
1227 : }
1228 0 : if (asconf->sent != SCTP_DATAGRAM_RESEND && chk->sent != SCTP_DATAGRAM_UNSENT)
1229 0 : sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1230 0 : chk->sent = SCTP_DATAGRAM_RESEND;
1231 : }
1232 0 : if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
1233 : /*
1234 : * If the address went un-reachable, we need to move
1235 : * to the alternate for ALL chunks in queue
1236 : */
1237 0 : sctp_move_chunks_from_net(stcb, net);
1238 : }
1239 : /* mark the retran info */
1240 0 : if (asconf->sent != SCTP_DATAGRAM_RESEND)
1241 0 : sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1242 0 : asconf->sent = SCTP_DATAGRAM_RESEND;
1243 :
1244 : /* send another ASCONF if any and we can do */
1245 0 : sctp_send_asconf(stcb, alt, SCTP_ADDR_NOT_LOCKED);
1246 : }
1247 0 : return (0);
1248 : }
1249 :
1250 : /* Mobility adaptation */
1251 : void
1252 0 : sctp_delete_prim_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1253 : struct sctp_nets *net SCTP_UNUSED)
1254 : {
1255 0 : if (stcb->asoc.deleted_primary == NULL) {
1256 0 : SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: deleted_primary is not stored...\n");
1257 0 : sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
1258 0 : return;
1259 : }
1260 0 : SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: finished to keep deleted primary ");
1261 0 : SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, &stcb->asoc.deleted_primary->ro._l_addr.sa);
1262 0 : sctp_free_remote_addr(stcb->asoc.deleted_primary);
1263 0 : stcb->asoc.deleted_primary = NULL;
1264 0 : sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
1265 0 : return;
1266 : }
1267 :
1268 : /*
1269 : * For the shutdown and shutdown-ack, we do not keep one around on the
1270 : * control queue. This means we must generate a new one and call the general
1271 : * chunk output routine, AFTER having done threshold management.
1272 : * It is assumed that net is non-NULL.
1273 : */
1274 : int
1275 0 : sctp_shutdown_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1276 : struct sctp_nets *net)
1277 : {
1278 : struct sctp_nets *alt;
1279 :
1280 : /* first threshold managment */
1281 0 : if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
1282 : /* Assoc is over */
1283 0 : return (1);
1284 : }
1285 0 : sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
1286 : /* second select an alternative */
1287 0 : alt = sctp_find_alternate_net(stcb, net, 0);
1288 :
1289 : /* third generate a shutdown into the queue for out net */
1290 0 : sctp_send_shutdown(stcb, alt);
1291 :
1292 : /* fourth restart timer */
1293 0 : sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, inp, stcb, alt);
1294 0 : return (0);
1295 : }
1296 :
1297 : int
1298 0 : sctp_shutdownack_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1299 : struct sctp_nets *net)
1300 : {
1301 : struct sctp_nets *alt;
1302 :
1303 : /* first threshold managment */
1304 0 : if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
1305 : /* Assoc is over */
1306 0 : return (1);
1307 : }
1308 0 : sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
1309 : /* second select an alternative */
1310 0 : alt = sctp_find_alternate_net(stcb, net, 0);
1311 :
1312 : /* third generate a shutdown into the queue for out net */
1313 0 : sctp_send_shutdown_ack(stcb, alt);
1314 :
1315 : /* fourth restart timer */
1316 0 : sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, inp, stcb, alt);
1317 0 : return (0);
1318 : }
1319 :
1320 : static void
1321 0 : sctp_audit_stream_queues_for_size(struct sctp_inpcb *inp,
1322 : struct sctp_tcb *stcb)
1323 : {
1324 : struct sctp_stream_queue_pending *sp;
1325 0 : unsigned int i, chks_in_queue = 0;
1326 0 : int being_filled = 0;
1327 : /*
1328 : * This function is ONLY called when the send/sent queues are empty.
1329 : */
1330 0 : if ((stcb == NULL) || (inp == NULL))
1331 0 : return;
1332 :
1333 0 : if (stcb->asoc.sent_queue_retran_cnt) {
1334 0 : SCTP_PRINTF("Hmm, sent_queue_retran_cnt is non-zero %d\n",
1335 : stcb->asoc.sent_queue_retran_cnt);
1336 0 : stcb->asoc.sent_queue_retran_cnt = 0;
1337 : }
1338 0 : if (stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
1339 : /* No stream scheduler information, initialize scheduler */
1340 0 : stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 0);
1341 0 : if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
1342 : /* yep, we lost a stream or two */
1343 0 : SCTP_PRINTF("Found additional streams NOT managed by scheduler, corrected\n");
1344 : } else {
1345 : /* no streams lost */
1346 0 : stcb->asoc.total_output_queue_size = 0;
1347 : }
1348 : }
1349 : /* Check to see if some data queued, if so report it */
1350 0 : for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1351 0 : if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
1352 0 : TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
1353 0 : if (sp->msg_is_complete)
1354 0 : being_filled++;
1355 0 : chks_in_queue++;
1356 : }
1357 : }
1358 : }
1359 0 : if (chks_in_queue != stcb->asoc.stream_queue_cnt) {
1360 0 : SCTP_PRINTF("Hmm, stream queue cnt at %d I counted %d in stream out wheel\n",
1361 : stcb->asoc.stream_queue_cnt, chks_in_queue);
1362 : }
1363 0 : if (chks_in_queue) {
1364 : /* call the output queue function */
1365 0 : sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_T3, SCTP_SO_NOT_LOCKED);
1366 0 : if ((TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
1367 0 : (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
1368 : /*
1369 : * Probably should go in and make it go back through
1370 : * and add fragments allowed
1371 : */
1372 0 : if (being_filled == 0) {
1373 0 : SCTP_PRINTF("Still nothing moved %d chunks are stuck\n",
1374 : chks_in_queue);
1375 : }
1376 : }
1377 : } else {
1378 0 : SCTP_PRINTF("Found no chunks on any queue tot:%lu\n",
1379 : (u_long)stcb->asoc.total_output_queue_size);
1380 0 : stcb->asoc.total_output_queue_size = 0;
1381 : }
1382 : }
1383 :
1384 : int
1385 0 : sctp_heartbeat_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1386 : struct sctp_nets *net)
1387 : {
1388 : uint8_t net_was_pf;
1389 :
1390 0 : if (net->dest_state & SCTP_ADDR_PF) {
1391 0 : net_was_pf = 1;
1392 : } else {
1393 0 : net_was_pf = 0;
1394 : }
1395 0 : if (net->hb_responded == 0) {
1396 0 : if (net->ro._s_addr) {
1397 : /* Invalidate the src address if we did not get
1398 : * a response last time.
1399 : */
1400 0 : sctp_free_ifa(net->ro._s_addr);
1401 0 : net->ro._s_addr = NULL;
1402 0 : net->src_addr_selected = 0;
1403 : }
1404 0 : sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
1405 0 : if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
1406 : /* Assoc is over */
1407 0 : return (1);
1408 : }
1409 : }
1410 : /* Zero PBA, if it needs it */
1411 0 : if (net->partial_bytes_acked) {
1412 0 : net->partial_bytes_acked = 0;
1413 : }
1414 0 : if ((stcb->asoc.total_output_queue_size > 0) &&
1415 0 : (TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
1416 0 : (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
1417 0 : sctp_audit_stream_queues_for_size(inp, stcb);
1418 : }
1419 0 : if (!(net->dest_state & SCTP_ADDR_NOHB) &&
1420 0 : !((net_was_pf == 0) && (net->dest_state & SCTP_ADDR_PF))) {
1421 : /* when move to PF during threshold mangement, a HB has been
1422 : queued in that routine */
1423 : uint32_t ms_gone_by;
1424 :
1425 0 : if ((net->last_sent_time.tv_sec > 0) ||
1426 0 : (net->last_sent_time.tv_usec > 0)) {
1427 : #ifdef __FreeBSD__
1428 : struct timeval diff;
1429 :
1430 : SCTP_GETTIME_TIMEVAL(&diff);
1431 : timevalsub(&diff, &net->last_sent_time);
1432 : #else
1433 : struct timeval diff, now;
1434 :
1435 0 : SCTP_GETTIME_TIMEVAL(&now);
1436 0 : timersub(&now, &net->last_sent_time, &diff);
1437 : #endif
1438 0 : ms_gone_by = (uint32_t)(diff.tv_sec * 1000) +
1439 0 : (uint32_t)(diff.tv_usec / 1000);
1440 : } else {
1441 0 : ms_gone_by = 0xffffffff;
1442 : }
1443 0 : if ((ms_gone_by >= net->heart_beat_delay) ||
1444 0 : (net->dest_state & SCTP_ADDR_PF)) {
1445 0 : sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
1446 : }
1447 : }
1448 0 : return (0);
1449 : }
1450 :
1451 : void
1452 0 : sctp_pathmtu_timer(struct sctp_inpcb *inp,
1453 : struct sctp_tcb *stcb,
1454 : struct sctp_nets *net)
1455 : {
1456 : uint32_t next_mtu, mtu;
1457 :
1458 0 : next_mtu = sctp_get_next_mtu(net->mtu);
1459 :
1460 0 : if ((next_mtu > net->mtu) && (net->port == 0)) {
1461 0 : if ((net->src_addr_selected == 0) ||
1462 0 : (net->ro._s_addr == NULL) ||
1463 0 : (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
1464 0 : if ((net->ro._s_addr != NULL) && (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
1465 0 : sctp_free_ifa(net->ro._s_addr);
1466 0 : net->ro._s_addr = NULL;
1467 0 : net->src_addr_selected = 0;
1468 0 : } else if (net->ro._s_addr == NULL) {
1469 : #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
1470 : if (net->ro._l_addr.sa.sa_family == AF_INET6) {
1471 : struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1472 : /* KAME hack: embed scopeid */
1473 : #if defined(__APPLE__)
1474 : #if defined(APPLE_LEOPARD) || defined(APPLE_SNOWLEOPARD)
1475 : (void)in6_embedscope(&sin6->sin6_addr, sin6, NULL, NULL);
1476 : #else
1477 : (void)in6_embedscope(&sin6->sin6_addr, sin6, NULL, NULL, NULL);
1478 : #endif
1479 : #elif defined(SCTP_KAME)
1480 : (void)sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
1481 : #else
1482 : (void)in6_embedscope(&sin6->sin6_addr, sin6);
1483 : #endif
1484 : }
1485 : #endif
1486 :
1487 0 : net->ro._s_addr = sctp_source_address_selection(inp,
1488 : stcb,
1489 0 : (sctp_route_t *)&net->ro,
1490 : net, 0, stcb->asoc.vrf_id);
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 : #ifdef SCTP_KAME
1495 : (void)sa6_recoverscope(sin6);
1496 : #else
1497 : (void)in6_recoverscope(sin6, &sin6->sin6_addr, NULL);
1498 : #endif /* SCTP_KAME */
1499 : }
1500 : #endif /* INET6 */
1501 : }
1502 0 : if (net->ro._s_addr)
1503 0 : net->src_addr_selected = 1;
1504 : }
1505 0 : if (net->ro._s_addr) {
1506 0 : mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._s_addr.sa, net->ro.ro_rt);
1507 : #if defined(INET) || defined(INET6)
1508 : if (net->port) {
1509 : mtu -= sizeof(struct udphdr);
1510 : }
1511 : #endif
1512 0 : if (mtu > next_mtu) {
1513 0 : net->mtu = next_mtu;
1514 : }
1515 : }
1516 : }
1517 : /* restart the timer */
1518 0 : sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net);
1519 0 : }
1520 :
1521 : void
1522 0 : sctp_autoclose_timer(struct sctp_inpcb *inp,
1523 : struct sctp_tcb *stcb,
1524 : struct sctp_nets *net)
1525 : {
1526 : struct timeval tn, *tim_touse;
1527 : struct sctp_association *asoc;
1528 : int ticks_gone_by;
1529 :
1530 0 : (void)SCTP_GETTIME_TIMEVAL(&tn);
1531 0 : if (stcb->asoc.sctp_autoclose_ticks &&
1532 0 : sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1533 : /* Auto close is on */
1534 0 : asoc = &stcb->asoc;
1535 : /* pick the time to use */
1536 0 : if (asoc->time_last_rcvd.tv_sec >
1537 0 : asoc->time_last_sent.tv_sec) {
1538 0 : tim_touse = &asoc->time_last_rcvd;
1539 : } else {
1540 0 : tim_touse = &asoc->time_last_sent;
1541 : }
1542 : /* Now has long enough transpired to autoclose? */
1543 0 : ticks_gone_by = SEC_TO_TICKS(tn.tv_sec - tim_touse->tv_sec);
1544 0 : if ((ticks_gone_by > 0) &&
1545 0 : (ticks_gone_by >= (int)asoc->sctp_autoclose_ticks)) {
1546 : /*
1547 : * autoclose time has hit, call the output routine,
1548 : * which should do nothing just to be SURE we don't
1549 : * have hanging data. We can then safely check the
1550 : * queues and know that we are clear to send
1551 : * shutdown
1552 : */
1553 0 : sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_AUTOCLOSE_TMR, SCTP_SO_NOT_LOCKED);
1554 : /* Are we clean? */
1555 0 : if (TAILQ_EMPTY(&asoc->send_queue) &&
1556 0 : TAILQ_EMPTY(&asoc->sent_queue)) {
1557 : /*
1558 : * there is nothing queued to send, so I'm
1559 : * done...
1560 : */
1561 0 : if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
1562 : /* only send SHUTDOWN 1st time thru */
1563 : struct sctp_nets *netp;
1564 :
1565 0 : if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
1566 0 : (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
1567 0 : SCTP_STAT_DECR_GAUGE32(sctps_currestab);
1568 : }
1569 0 : SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
1570 0 : SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
1571 0 : sctp_stop_timers_for_shutdown(stcb);
1572 0 : if (stcb->asoc.alternate) {
1573 0 : netp = stcb->asoc.alternate;
1574 : } else {
1575 0 : netp = stcb->asoc.primary_destination;
1576 : }
1577 0 : sctp_send_shutdown(stcb, netp);
1578 0 : sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
1579 : stcb->sctp_ep, stcb,
1580 : netp);
1581 0 : sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1582 : stcb->sctp_ep, stcb,
1583 : netp);
1584 : }
1585 : }
1586 : } else {
1587 : /*
1588 : * No auto close at this time, reset t-o to check
1589 : * later
1590 : */
1591 : int tmp;
1592 :
1593 : /* fool the timer startup to use the time left */
1594 0 : tmp = asoc->sctp_autoclose_ticks;
1595 0 : asoc->sctp_autoclose_ticks -= ticks_gone_by;
1596 0 : sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1597 : net);
1598 : /* restore the real tick value */
1599 0 : asoc->sctp_autoclose_ticks = tmp;
1600 : }
1601 : }
1602 0 : }
1603 :
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