2 * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
3 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
4 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
9 * a) Redistributions of source code must retain the above copyright notice,
10 * this list of conditions and the following disclaimer.
12 * b) Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in
14 * the documentation and/or other materials provided with the distribution.
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17 * contributors may be used to endorse or promote products derived
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20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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30 * THE POSSIBILITY OF SUCH DAMAGE.
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
36 #include <netinet/sctp_os.h>
37 #include <netinet/sctp_var.h>
38 #include <netinet/sctp_sysctl.h>
39 #include <netinet/sctp_pcb.h>
40 #include <netinet/sctp_header.h>
41 #include <netinet/sctputil.h>
42 #include <netinet/sctp_output.h>
43 #include <netinet/sctp_input.h>
44 #include <netinet/sctp_indata.h>
45 #include <netinet/sctp_uio.h>
46 #include <netinet/sctp_timer.h>
50 * NOTES: On the outbound side of things I need to check the sack timer to
51 * see if I should generate a sack into the chunk queue (if I have data to
52 * send that is and will be sending it .. for bundling.
54 * The callback in sctp_usrreq.c will get called when the socket is read from.
55 * This will cause sctp_service_queues() to get called on the top entry in
60 sctp_set_rwnd(struct sctp_tcb *stcb, struct sctp_association *asoc)
62 asoc->my_rwnd = sctp_calc_rwnd(stcb, asoc);
65 /* Calculate what the rwnd would be */
67 sctp_calc_rwnd(struct sctp_tcb *stcb, struct sctp_association *asoc)
72 * This is really set wrong with respect to a 1-2-m socket. Since
73 * the sb_cc is the count that everyone as put up. When we re-write
74 * sctp_soreceive then we will fix this so that ONLY this
75 * associations data is taken into account.
77 if (stcb->sctp_socket == NULL)
80 if (stcb->asoc.sb_cc == 0 &&
81 asoc->size_on_reasm_queue == 0 &&
82 asoc->size_on_all_streams == 0) {
83 /* Full rwnd granted */
84 calc = max(SCTP_SB_LIMIT_RCV(stcb->sctp_socket), SCTP_MINIMAL_RWND);
87 /* get actual space */
88 calc = (uint32_t) sctp_sbspace(&stcb->asoc, &stcb->sctp_socket->so_rcv);
91 * take out what has NOT been put on socket queue and we yet hold
94 calc = sctp_sbspace_sub(calc, (uint32_t) (asoc->size_on_reasm_queue +
95 asoc->cnt_on_reasm_queue * MSIZE));
96 calc = sctp_sbspace_sub(calc, (uint32_t) (asoc->size_on_all_streams +
97 asoc->cnt_on_all_streams * MSIZE));
103 /* what is the overhead of all these rwnd's */
104 calc = sctp_sbspace_sub(calc, stcb->asoc.my_rwnd_control_len);
106 * If the window gets too small due to ctrl-stuff, reduce it to 1,
107 * even it is 0. SWS engaged
109 if (calc < stcb->asoc.my_rwnd_control_len) {
118 * Build out our readq entry based on the incoming packet.
120 struct sctp_queued_to_read *
121 sctp_build_readq_entry(struct sctp_tcb *stcb,
122 struct sctp_nets *net,
123 uint32_t tsn, uint32_t ppid,
124 uint32_t context, uint16_t stream_no,
125 uint16_t stream_seq, uint8_t flags,
128 struct sctp_queued_to_read *read_queue_e = NULL;
130 sctp_alloc_a_readq(stcb, read_queue_e);
131 if (read_queue_e == NULL) {
134 read_queue_e->sinfo_stream = stream_no;
135 read_queue_e->sinfo_ssn = stream_seq;
136 read_queue_e->sinfo_flags = (flags << 8);
137 read_queue_e->sinfo_ppid = ppid;
138 read_queue_e->sinfo_context = context;
139 read_queue_e->sinfo_timetolive = 0;
140 read_queue_e->sinfo_tsn = tsn;
141 read_queue_e->sinfo_cumtsn = tsn;
142 read_queue_e->sinfo_assoc_id = sctp_get_associd(stcb);
143 read_queue_e->whoFrom = net;
144 read_queue_e->length = 0;
145 atomic_add_int(&net->ref_count, 1);
146 read_queue_e->data = dm;
147 read_queue_e->spec_flags = 0;
148 read_queue_e->tail_mbuf = NULL;
149 read_queue_e->aux_data = NULL;
150 read_queue_e->stcb = stcb;
151 read_queue_e->port_from = stcb->rport;
152 read_queue_e->do_not_ref_stcb = 0;
153 read_queue_e->end_added = 0;
154 read_queue_e->some_taken = 0;
155 read_queue_e->pdapi_aborted = 0;
157 return (read_queue_e);
162 * Build out our readq entry based on the incoming packet.
164 static struct sctp_queued_to_read *
165 sctp_build_readq_entry_chk(struct sctp_tcb *stcb,
166 struct sctp_tmit_chunk *chk)
168 struct sctp_queued_to_read *read_queue_e = NULL;
170 sctp_alloc_a_readq(stcb, read_queue_e);
171 if (read_queue_e == NULL) {
174 read_queue_e->sinfo_stream = chk->rec.data.stream_number;
175 read_queue_e->sinfo_ssn = chk->rec.data.stream_seq;
176 read_queue_e->sinfo_flags = (chk->rec.data.rcv_flags << 8);
177 read_queue_e->sinfo_ppid = chk->rec.data.payloadtype;
178 read_queue_e->sinfo_context = stcb->asoc.context;
179 read_queue_e->sinfo_timetolive = 0;
180 read_queue_e->sinfo_tsn = chk->rec.data.TSN_seq;
181 read_queue_e->sinfo_cumtsn = chk->rec.data.TSN_seq;
182 read_queue_e->sinfo_assoc_id = sctp_get_associd(stcb);
183 read_queue_e->whoFrom = chk->whoTo;
184 read_queue_e->aux_data = NULL;
185 read_queue_e->length = 0;
186 atomic_add_int(&chk->whoTo->ref_count, 1);
187 read_queue_e->data = chk->data;
188 read_queue_e->tail_mbuf = NULL;
189 read_queue_e->stcb = stcb;
190 read_queue_e->port_from = stcb->rport;
191 read_queue_e->spec_flags = 0;
192 read_queue_e->do_not_ref_stcb = 0;
193 read_queue_e->end_added = 0;
194 read_queue_e->some_taken = 0;
195 read_queue_e->pdapi_aborted = 0;
197 return (read_queue_e);
202 sctp_build_ctl_nchunk(struct sctp_inpcb *inp, struct sctp_sndrcvinfo *sinfo)
204 struct sctp_extrcvinfo *seinfo;
205 struct sctp_sndrcvinfo *outinfo;
206 struct sctp_rcvinfo *rcvinfo;
207 struct sctp_nxtinfo *nxtinfo;
214 if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_RECVDATAIOEVNT) &&
215 sctp_is_feature_off(inp, SCTP_PCB_FLAGS_RECVRCVINFO) &&
216 sctp_is_feature_off(inp, SCTP_PCB_FLAGS_RECVNXTINFO)) {
217 /* user does not want any ancillary data */
221 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVRCVINFO)) {
222 len += CMSG_SPACE(sizeof(struct sctp_rcvinfo));
224 seinfo = (struct sctp_extrcvinfo *)sinfo;
225 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVNXTINFO) &&
226 (seinfo->sreinfo_next_flags & SCTP_NEXT_MSG_AVAIL)) {
228 len += CMSG_SPACE(sizeof(struct sctp_rcvinfo));
232 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVDATAIOEVNT)) {
233 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXT_RCVINFO)) {
235 len += CMSG_SPACE(sizeof(struct sctp_extrcvinfo));
238 len += CMSG_SPACE(sizeof(struct sctp_sndrcvinfo));
244 ret = sctp_get_mbuf_for_msg(len, 0, M_DONTWAIT, 1, MT_DATA);
249 SCTP_BUF_LEN(ret) = 0;
251 /* We need a CMSG header followed by the struct */
252 cmh = mtod(ret, struct cmsghdr *);
254 * Make sure that there is no un-initialized padding between the
255 * cmsg header and cmsg data and after the cmsg data.
258 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVRCVINFO)) {
259 cmh->cmsg_level = IPPROTO_SCTP;
260 cmh->cmsg_len = CMSG_LEN(sizeof(struct sctp_rcvinfo));
261 cmh->cmsg_type = SCTP_RCVINFO;
262 rcvinfo = (struct sctp_rcvinfo *)CMSG_DATA(cmh);
263 rcvinfo->rcv_sid = sinfo->sinfo_stream;
264 rcvinfo->rcv_ssn = sinfo->sinfo_ssn;
265 rcvinfo->rcv_flags = sinfo->sinfo_flags;
266 rcvinfo->rcv_ppid = sinfo->sinfo_ppid;
267 rcvinfo->rcv_tsn = sinfo->sinfo_tsn;
268 rcvinfo->rcv_cumtsn = sinfo->sinfo_cumtsn;
269 rcvinfo->rcv_context = sinfo->sinfo_context;
270 rcvinfo->rcv_assoc_id = sinfo->sinfo_assoc_id;
271 cmh = (struct cmsghdr *)((caddr_t)cmh + CMSG_SPACE(sizeof(struct sctp_rcvinfo)));
272 SCTP_BUF_LEN(ret) += CMSG_SPACE(sizeof(struct sctp_rcvinfo));
275 cmh->cmsg_level = IPPROTO_SCTP;
276 cmh->cmsg_len = CMSG_LEN(sizeof(struct sctp_nxtinfo));
277 cmh->cmsg_type = SCTP_NXTINFO;
278 nxtinfo = (struct sctp_nxtinfo *)CMSG_DATA(cmh);
279 nxtinfo->nxt_sid = seinfo->sreinfo_next_stream;
280 nxtinfo->nxt_flags = 0;
281 if (seinfo->sreinfo_next_flags & SCTP_NEXT_MSG_IS_UNORDERED) {
282 nxtinfo->nxt_flags |= SCTP_UNORDERED;
284 if (seinfo->sreinfo_next_flags & SCTP_NEXT_MSG_IS_NOTIFICATION) {
285 nxtinfo->nxt_flags |= SCTP_NOTIFICATION;
287 if (seinfo->sreinfo_next_flags & SCTP_NEXT_MSG_ISCOMPLETE) {
288 nxtinfo->nxt_flags |= SCTP_COMPLETE;
290 nxtinfo->nxt_ppid = seinfo->sreinfo_next_ppid;
291 nxtinfo->nxt_length = seinfo->sreinfo_next_length;
292 nxtinfo->nxt_assoc_id = seinfo->sreinfo_next_aid;
293 cmh = (struct cmsghdr *)((caddr_t)cmh + CMSG_SPACE(sizeof(struct sctp_nxtinfo)));
294 SCTP_BUF_LEN(ret) += CMSG_SPACE(sizeof(struct sctp_nxtinfo));
296 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVDATAIOEVNT)) {
297 cmh->cmsg_level = IPPROTO_SCTP;
298 outinfo = (struct sctp_sndrcvinfo *)CMSG_DATA(cmh);
300 cmh->cmsg_len = CMSG_LEN(sizeof(struct sctp_extrcvinfo));
301 cmh->cmsg_type = SCTP_EXTRCV;
302 memcpy(outinfo, sinfo, sizeof(struct sctp_extrcvinfo));
303 SCTP_BUF_LEN(ret) += CMSG_SPACE(sizeof(struct sctp_extrcvinfo));
305 cmh->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo));
306 cmh->cmsg_type = SCTP_SNDRCV;
308 SCTP_BUF_LEN(ret) += CMSG_SPACE(sizeof(struct sctp_sndrcvinfo));
316 sctp_mark_non_revokable(struct sctp_association *asoc, uint32_t tsn)
318 uint32_t gap, i, cumackp1;
321 if (SCTP_BASE_SYSCTL(sctp_do_drain) == 0) {
324 cumackp1 = asoc->cumulative_tsn + 1;
325 if (SCTP_TSN_GT(cumackp1, tsn)) {
327 * this tsn is behind the cum ack and thus we don't need to
328 * worry about it being moved from one to the other.
332 SCTP_CALC_TSN_TO_GAP(gap, tsn, asoc->mapping_array_base_tsn);
333 if (!SCTP_IS_TSN_PRESENT(asoc->mapping_array, gap)) {
334 SCTP_PRINTF("gap:%x tsn:%x\n", gap, tsn);
335 sctp_print_mapping_array(asoc);
337 panic("Things are really messed up now!!");
340 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap);
341 SCTP_UNSET_TSN_PRESENT(asoc->mapping_array, gap);
342 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) {
343 asoc->highest_tsn_inside_nr_map = tsn;
345 if (tsn == asoc->highest_tsn_inside_map) {
346 /* We must back down to see what the new highest is */
347 for (i = tsn - 1; SCTP_TSN_GE(i, asoc->mapping_array_base_tsn); i--) {
348 SCTP_CALC_TSN_TO_GAP(gap, i, asoc->mapping_array_base_tsn);
349 if (SCTP_IS_TSN_PRESENT(asoc->mapping_array, gap)) {
350 asoc->highest_tsn_inside_map = i;
356 asoc->highest_tsn_inside_map = asoc->mapping_array_base_tsn - 1;
363 * We are delivering currently from the reassembly queue. We must continue to
364 * deliver until we either: 1) run out of space. 2) run out of sequential
365 * TSN's 3) hit the SCTP_DATA_LAST_FRAG flag.
368 sctp_service_reassembly(struct sctp_tcb *stcb, struct sctp_association *asoc)
370 struct sctp_tmit_chunk *chk, *nchk;
375 struct sctp_queued_to_read *control, *ctl, *nctl;
380 cntDel = stream_no = 0;
381 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
382 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
383 (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET)) {
384 /* socket above is long gone or going.. */
386 asoc->fragmented_delivery_inprogress = 0;
387 TAILQ_FOREACH_SAFE(chk, &asoc->reasmqueue, sctp_next, nchk) {
388 TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next);
389 asoc->size_on_reasm_queue -= chk->send_size;
390 sctp_ucount_decr(asoc->cnt_on_reasm_queue);
392 * Lose the data pointer, since its in the socket
396 sctp_m_freem(chk->data);
399 /* Now free the address and data */
400 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
401 /* sa_ignore FREED_MEMORY */
405 SCTP_TCB_LOCK_ASSERT(stcb);
406 TAILQ_FOREACH_SAFE(chk, &asoc->reasmqueue, sctp_next, nchk) {
407 if (chk->rec.data.TSN_seq != (asoc->tsn_last_delivered + 1)) {
408 /* Can't deliver more :< */
411 stream_no = chk->rec.data.stream_number;
412 nxt_todel = asoc->strmin[stream_no].last_sequence_delivered + 1;
413 if (nxt_todel != chk->rec.data.stream_seq &&
414 (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
416 * Not the next sequence to deliver in its stream OR
421 if (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) {
423 control = sctp_build_readq_entry_chk(stcb, chk);
424 if (control == NULL) {
428 /* save it off for our future deliveries */
429 stcb->asoc.control_pdapi = control;
430 if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG)
434 sctp_mark_non_revokable(asoc, chk->rec.data.TSN_seq);
435 sctp_add_to_readq(stcb->sctp_ep,
436 stcb, control, &stcb->sctp_socket->so_rcv, end,
437 SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED);
440 if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG)
444 sctp_mark_non_revokable(asoc, chk->rec.data.TSN_seq);
445 if (sctp_append_to_readq(stcb->sctp_ep, stcb,
446 stcb->asoc.control_pdapi,
447 chk->data, end, chk->rec.data.TSN_seq,
448 &stcb->sctp_socket->so_rcv)) {
450 * something is very wrong, either
451 * control_pdapi is NULL, or the tail_mbuf
452 * is corrupt, or there is a EOM already on
455 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
459 if ((stcb->asoc.control_pdapi == NULL) || (stcb->asoc.control_pdapi->tail_mbuf == NULL)) {
460 panic("This should not happen control_pdapi NULL?");
462 /* if we did not panic, it was a EOM */
463 panic("Bad chunking ??");
465 if ((stcb->asoc.control_pdapi == NULL) || (stcb->asoc.control_pdapi->tail_mbuf == NULL)) {
466 SCTP_PRINTF("This should not happen control_pdapi NULL?\n");
468 SCTP_PRINTF("Bad chunking ??\n");
469 SCTP_PRINTF("Dumping re-assembly queue this will probably hose the association\n");
477 /* pull it we did it */
478 TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next);
479 if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) {
480 asoc->fragmented_delivery_inprogress = 0;
481 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
482 asoc->strmin[stream_no].last_sequence_delivered++;
484 if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0) {
485 SCTP_STAT_INCR_COUNTER64(sctps_reasmusrmsgs);
487 } else if (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) {
489 * turn the flag back on since we just delivered
492 asoc->fragmented_delivery_inprogress = 1;
494 asoc->tsn_of_pdapi_last_delivered = chk->rec.data.TSN_seq;
495 asoc->last_flags_delivered = chk->rec.data.rcv_flags;
496 asoc->last_strm_seq_delivered = chk->rec.data.stream_seq;
497 asoc->last_strm_no_delivered = chk->rec.data.stream_number;
499 asoc->tsn_last_delivered = chk->rec.data.TSN_seq;
500 asoc->size_on_reasm_queue -= chk->send_size;
501 sctp_ucount_decr(asoc->cnt_on_reasm_queue);
502 /* free up the chk */
504 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
506 if (asoc->fragmented_delivery_inprogress == 0) {
508 * Now lets see if we can deliver the next one on
511 struct sctp_stream_in *strm;
513 strm = &asoc->strmin[stream_no];
514 nxt_todel = strm->last_sequence_delivered + 1;
515 TAILQ_FOREACH_SAFE(ctl, &strm->inqueue, next, nctl) {
516 /* Deliver more if we can. */
517 if (nxt_todel == ctl->sinfo_ssn) {
518 TAILQ_REMOVE(&strm->inqueue, ctl, next);
519 asoc->size_on_all_streams -= ctl->length;
520 sctp_ucount_decr(asoc->cnt_on_all_streams);
521 strm->last_sequence_delivered++;
522 sctp_mark_non_revokable(asoc, ctl->sinfo_tsn);
523 sctp_add_to_readq(stcb->sctp_ep, stcb,
525 &stcb->sctp_socket->so_rcv, 1,
526 SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED);
530 nxt_todel = strm->last_sequence_delivered + 1;
538 * Queue the chunk either right into the socket buffer if it is the next one
539 * to go OR put it in the correct place in the delivery queue. If we do
540 * append to the so_buf, keep doing so until we are out of order. One big
541 * question still remains, what to do when the socket buffer is FULL??
544 sctp_queue_data_to_stream(struct sctp_tcb *stcb, struct sctp_association *asoc,
545 struct sctp_queued_to_read *control, int *abort_flag)
548 * FIX-ME maybe? What happens when the ssn wraps? If we are getting
549 * all the data in one stream this could happen quite rapidly. One
550 * could use the TSN to keep track of things, but this scheme breaks
551 * down in the other type of stream useage that could occur. Send a
552 * single msg to stream 0, send 4Billion messages to stream 1, now
553 * send a message to stream 0. You have a situation where the TSN
554 * has wrapped but not in the stream. Is this worth worrying about
555 * or should we just change our queue sort at the bottom to be by
558 * Could it also be legal for a peer to send ssn 1 with TSN 2 and ssn 2
559 * with TSN 1? If the peer is doing some sort of funky TSN/SSN
560 * assignment this could happen... and I don't see how this would be
561 * a violation. So for now I am undecided an will leave the sort by
562 * SSN alone. Maybe a hybred approach is the answer
565 struct sctp_stream_in *strm;
566 struct sctp_queued_to_read *at;
570 char msg[SCTP_DIAG_INFO_LEN];
573 asoc->size_on_all_streams += control->length;
574 sctp_ucount_incr(asoc->cnt_on_all_streams);
575 strm = &asoc->strmin[control->sinfo_stream];
576 nxt_todel = strm->last_sequence_delivered + 1;
577 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
578 sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_INTO_STRD);
580 SCTPDBG(SCTP_DEBUG_INDATA1,
581 "queue to stream called for ssn:%u lastdel:%u nxt:%u\n",
582 (uint32_t) control->sinfo_stream,
583 (uint32_t) strm->last_sequence_delivered,
584 (uint32_t) nxt_todel);
585 if (SCTP_SSN_GE(strm->last_sequence_delivered, control->sinfo_ssn)) {
586 /* The incoming sseq is behind where we last delivered? */
587 SCTPDBG(SCTP_DEBUG_INDATA1, "Duplicate S-SEQ:%d delivered:%d from peer, Abort association\n",
588 control->sinfo_ssn, strm->last_sequence_delivered);
591 * throw it in the stream so it gets cleaned up in
592 * association destruction
594 TAILQ_INSERT_HEAD(&strm->inqueue, control, next);
595 snprintf(msg, sizeof(msg), "Delivered SSN=%4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
596 strm->last_sequence_delivered, control->sinfo_tsn,
597 control->sinfo_stream, control->sinfo_ssn);
598 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
599 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_1;
600 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
605 if (nxt_todel == control->sinfo_ssn) {
606 /* can be delivered right away? */
607 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
608 sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_IMMED_DEL);
610 /* EY it wont be queued if it could be delivered directly */
612 asoc->size_on_all_streams -= control->length;
613 sctp_ucount_decr(asoc->cnt_on_all_streams);
614 strm->last_sequence_delivered++;
616 sctp_mark_non_revokable(asoc, control->sinfo_tsn);
617 sctp_add_to_readq(stcb->sctp_ep, stcb,
619 &stcb->sctp_socket->so_rcv, 1,
620 SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED);
621 TAILQ_FOREACH_SAFE(control, &strm->inqueue, next, at) {
623 nxt_todel = strm->last_sequence_delivered + 1;
624 if (nxt_todel == control->sinfo_ssn) {
625 TAILQ_REMOVE(&strm->inqueue, control, next);
626 asoc->size_on_all_streams -= control->length;
627 sctp_ucount_decr(asoc->cnt_on_all_streams);
628 strm->last_sequence_delivered++;
630 * We ignore the return of deliver_data here
631 * since we always can hold the chunk on the
632 * d-queue. And we have a finite number that
633 * can be delivered from the strq.
635 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
636 sctp_log_strm_del(control, NULL,
637 SCTP_STR_LOG_FROM_IMMED_DEL);
639 sctp_mark_non_revokable(asoc, control->sinfo_tsn);
640 sctp_add_to_readq(stcb->sctp_ep, stcb,
642 &stcb->sctp_socket->so_rcv, 1,
643 SCTP_READ_LOCK_NOT_HELD,
652 * Ok, we did not deliver this guy, find the correct place
653 * to put it on the queue.
655 if (SCTP_TSN_GE(asoc->cumulative_tsn, control->sinfo_tsn)) {
658 if (TAILQ_EMPTY(&strm->inqueue)) {
660 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
661 sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_INSERT_HD);
663 TAILQ_INSERT_HEAD(&strm->inqueue, control, next);
665 TAILQ_FOREACH(at, &strm->inqueue, next) {
666 if (SCTP_SSN_GT(at->sinfo_ssn, control->sinfo_ssn)) {
668 * one in queue is bigger than the
669 * new one, insert before this one
671 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
672 sctp_log_strm_del(control, at,
673 SCTP_STR_LOG_FROM_INSERT_MD);
675 TAILQ_INSERT_BEFORE(at, control, next);
677 } else if (at->sinfo_ssn == control->sinfo_ssn) {
679 * Gak, He sent me a duplicate str
683 * foo bar, I guess I will just free
684 * this new guy, should we abort
685 * too? FIX ME MAYBE? Or it COULD be
686 * that the SSN's have wrapped.
687 * Maybe I should compare to TSN
688 * somehow... sigh for now just blow
693 sctp_m_freem(control->data);
694 control->data = NULL;
695 asoc->size_on_all_streams -= control->length;
696 sctp_ucount_decr(asoc->cnt_on_all_streams);
697 if (control->whoFrom) {
698 sctp_free_remote_addr(control->whoFrom);
699 control->whoFrom = NULL;
701 sctp_free_a_readq(stcb, control);
704 if (TAILQ_NEXT(at, next) == NULL) {
706 * We are at the end, insert
709 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
710 sctp_log_strm_del(control, at,
711 SCTP_STR_LOG_FROM_INSERT_TL);
713 TAILQ_INSERT_AFTER(&strm->inqueue,
724 * Returns two things: You get the total size of the deliverable parts of the
725 * first fragmented message on the reassembly queue. And you get a 1 back if
726 * all of the message is ready or a 0 back if the message is still incomplete
729 sctp_is_all_msg_on_reasm(struct sctp_association *asoc, uint32_t * t_size)
731 struct sctp_tmit_chunk *chk;
735 chk = TAILQ_FIRST(&asoc->reasmqueue);
737 /* nothing on the queue */
740 if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0) {
741 /* Not a first on the queue */
744 tsn = chk->rec.data.TSN_seq;
745 TAILQ_FOREACH(chk, &asoc->reasmqueue, sctp_next) {
746 if (tsn != chk->rec.data.TSN_seq) {
749 *t_size += chk->send_size;
750 if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) {
759 sctp_deliver_reasm_check(struct sctp_tcb *stcb, struct sctp_association *asoc)
761 struct sctp_tmit_chunk *chk;
763 uint32_t tsize, pd_point;
766 chk = TAILQ_FIRST(&asoc->reasmqueue);
769 asoc->size_on_reasm_queue = 0;
770 asoc->cnt_on_reasm_queue = 0;
773 if (asoc->fragmented_delivery_inprogress == 0) {
775 asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered + 1;
776 if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) &&
777 (nxt_todel == chk->rec.data.stream_seq ||
778 (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED))) {
780 * Yep the first one is here and its ok to deliver
783 if (stcb->sctp_socket) {
784 pd_point = min(SCTP_SB_LIMIT_RCV(stcb->sctp_socket) >> SCTP_PARTIAL_DELIVERY_SHIFT,
785 stcb->sctp_ep->partial_delivery_point);
787 pd_point = stcb->sctp_ep->partial_delivery_point;
789 if (sctp_is_all_msg_on_reasm(asoc, &tsize) || (tsize >= pd_point)) {
791 * Yes, we setup to start reception, by
792 * backing down the TSN just in case we
793 * can't deliver. If we
795 asoc->fragmented_delivery_inprogress = 1;
796 asoc->tsn_last_delivered =
797 chk->rec.data.TSN_seq - 1;
799 chk->rec.data.stream_number;
800 asoc->ssn_of_pdapi = chk->rec.data.stream_seq;
801 asoc->pdapi_ppid = chk->rec.data.payloadtype;
802 asoc->fragment_flags = chk->rec.data.rcv_flags;
803 sctp_service_reassembly(stcb, asoc);
808 * Service re-assembly will deliver stream data queued at
809 * the end of fragmented delivery.. but it wont know to go
810 * back and call itself again... we do that here with the
813 sctp_service_reassembly(stcb, asoc);
814 if (asoc->fragmented_delivery_inprogress == 0) {
816 * finished our Fragmented delivery, could be more
825 * Dump onto the re-assembly queue, in its proper place. After dumping on the
826 * queue, see if anthing can be delivered. If so pull it off (or as much as
827 * we can. If we run out of space then we must dump what we can and set the
828 * appropriate flag to say we queued what we could.
831 sctp_queue_data_for_reasm(struct sctp_tcb *stcb, struct sctp_association *asoc,
832 struct sctp_tmit_chunk *chk, int *abort_flag)
835 char msg[SCTP_DIAG_INFO_LEN];
836 uint32_t cum_ackp1, prev_tsn, post_tsn;
837 struct sctp_tmit_chunk *at, *prev, *next;
840 cum_ackp1 = asoc->tsn_last_delivered + 1;
841 if (TAILQ_EMPTY(&asoc->reasmqueue)) {
842 /* This is the first one on the queue */
843 TAILQ_INSERT_HEAD(&asoc->reasmqueue, chk, sctp_next);
845 * we do not check for delivery of anything when only one
848 asoc->size_on_reasm_queue = chk->send_size;
849 sctp_ucount_incr(asoc->cnt_on_reasm_queue);
850 if (chk->rec.data.TSN_seq == cum_ackp1) {
851 if (asoc->fragmented_delivery_inprogress == 0 &&
852 (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) !=
853 SCTP_DATA_FIRST_FRAG) {
855 * An empty queue, no delivery inprogress,
856 * we hit the next one and it does NOT have
857 * a FIRST fragment mark.
859 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, its not first, no fragmented delivery in progress\n");
860 snprintf(msg, sizeof(msg),
861 "Expected B-bit for TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
862 chk->rec.data.TSN_seq,
863 chk->rec.data.stream_number,
864 chk->rec.data.stream_seq);
865 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
866 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_2;
867 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
869 } else if (asoc->fragmented_delivery_inprogress &&
870 (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == SCTP_DATA_FIRST_FRAG) {
872 * We are doing a partial delivery and the
873 * NEXT chunk MUST be either the LAST or
874 * MIDDLE fragment NOT a FIRST
876 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it IS a first and fragmented delivery in progress\n");
877 snprintf(msg, sizeof(msg),
878 "Didn't expect B-bit for TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
879 chk->rec.data.TSN_seq,
880 chk->rec.data.stream_number,
881 chk->rec.data.stream_seq);
882 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
883 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_3;
884 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
886 } else if (asoc->fragmented_delivery_inprogress) {
888 * Here we are ok with a MIDDLE or LAST
891 if (chk->rec.data.stream_number !=
892 asoc->str_of_pdapi) {
893 /* Got to be the right STR No */
894 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it IS not same stream number %d vs %d\n",
895 chk->rec.data.stream_number,
897 snprintf(msg, sizeof(msg),
898 "Expected SID=%4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
900 chk->rec.data.TSN_seq,
901 chk->rec.data.stream_number,
902 chk->rec.data.stream_seq);
903 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
904 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_4;
905 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
907 } else if ((asoc->fragment_flags & SCTP_DATA_UNORDERED) !=
908 SCTP_DATA_UNORDERED &&
909 chk->rec.data.stream_seq != asoc->ssn_of_pdapi) {
910 /* Got to be the right STR Seq */
911 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it IS not same stream seq %d vs %d\n",
912 chk->rec.data.stream_seq,
914 snprintf(msg, sizeof(msg),
915 "Expected SSN=%4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
917 chk->rec.data.TSN_seq,
918 chk->rec.data.stream_number,
919 chk->rec.data.stream_seq);
920 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
921 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_5;
922 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
930 TAILQ_FOREACH(at, &asoc->reasmqueue, sctp_next) {
931 if (SCTP_TSN_GT(at->rec.data.TSN_seq, chk->rec.data.TSN_seq)) {
933 * one in queue is bigger than the new one, insert
937 asoc->size_on_reasm_queue += chk->send_size;
938 sctp_ucount_incr(asoc->cnt_on_reasm_queue);
940 TAILQ_INSERT_BEFORE(at, chk, sctp_next);
942 } else if (at->rec.data.TSN_seq == chk->rec.data.TSN_seq) {
943 /* Gak, He sent me a duplicate str seq number */
945 * foo bar, I guess I will just free this new guy,
946 * should we abort too? FIX ME MAYBE? Or it COULD be
947 * that the SSN's have wrapped. Maybe I should
948 * compare to TSN somehow... sigh for now just blow
952 sctp_m_freem(chk->data);
955 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
959 if (TAILQ_NEXT(at, sctp_next) == NULL) {
961 * We are at the end, insert it after this
965 asoc->size_on_reasm_queue += chk->send_size;
966 sctp_ucount_incr(asoc->cnt_on_reasm_queue);
967 TAILQ_INSERT_AFTER(&asoc->reasmqueue, at, chk, sctp_next);
974 prev_tsn = chk->rec.data.TSN_seq - 1;
975 if (prev_tsn == prev->rec.data.TSN_seq) {
977 * Ok the one I am dropping onto the end is the
978 * NEXT. A bit of valdiation here.
980 if ((prev->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
981 SCTP_DATA_FIRST_FRAG ||
982 (prev->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
983 SCTP_DATA_MIDDLE_FRAG) {
985 * Insert chk MUST be a MIDDLE or LAST
988 if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
989 SCTP_DATA_FIRST_FRAG) {
990 SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - It can be a midlle or last but not a first\n");
991 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it's a FIRST!\n");
992 snprintf(msg, sizeof(msg),
993 "Can't handle B-bit, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
994 chk->rec.data.TSN_seq,
995 chk->rec.data.stream_number,
996 chk->rec.data.stream_seq);
997 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
998 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_6;
999 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
1003 if (chk->rec.data.stream_number !=
1004 prev->rec.data.stream_number) {
1006 * Huh, need the correct STR here,
1007 * they must be the same.
1009 SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - Gak, Evil plot, sid:%d not the same as at:%d\n",
1010 chk->rec.data.stream_number,
1011 prev->rec.data.stream_number);
1012 snprintf(msg, sizeof(msg),
1013 "Expect SID=%4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
1014 prev->rec.data.stream_number,
1015 chk->rec.data.TSN_seq,
1016 chk->rec.data.stream_number,
1017 chk->rec.data.stream_seq);
1018 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
1019 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_7;
1020 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
1024 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) !=
1025 (prev->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
1027 * Huh, need the same ordering here,
1028 * they must be the same.
1030 SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - Gak, Evil plot, U-bit not constant\n");
1031 snprintf(msg, sizeof(msg),
1032 "Expect U-bit=%d for TSN=%8.8x, got U-bit=%d",
1033 (prev->rec.data.rcv_flags & SCTP_DATA_UNORDERED) ? 1 : 0,
1034 chk->rec.data.TSN_seq,
1035 (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) ? 1 : 0);
1036 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
1037 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_7;
1038 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
1042 if ((prev->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0 &&
1043 chk->rec.data.stream_seq !=
1044 prev->rec.data.stream_seq) {
1046 * Huh, need the correct STR here,
1047 * they must be the same.
1049 SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - Gak, Evil plot, sseq:%d not the same as at:%d\n",
1050 chk->rec.data.stream_seq,
1051 prev->rec.data.stream_seq);
1052 snprintf(msg, sizeof(msg),
1053 "Expect SSN=%4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
1054 prev->rec.data.stream_seq,
1055 chk->rec.data.TSN_seq,
1056 chk->rec.data.stream_number,
1057 chk->rec.data.stream_seq);
1058 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
1059 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_8;
1060 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
1064 } else if ((prev->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
1065 SCTP_DATA_LAST_FRAG) {
1066 /* Insert chk MUST be a FIRST */
1067 if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) !=
1068 SCTP_DATA_FIRST_FRAG) {
1069 SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - Gak, evil plot, its not FIRST and it must be!\n");
1070 snprintf(msg, sizeof(msg),
1071 "Expect B-bit, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
1072 chk->rec.data.TSN_seq,
1073 chk->rec.data.stream_number,
1074 chk->rec.data.stream_seq);
1075 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
1076 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_9;
1077 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
1085 post_tsn = chk->rec.data.TSN_seq + 1;
1086 if (post_tsn == next->rec.data.TSN_seq) {
1088 * Ok the one I am inserting ahead of is my NEXT
1089 * one. A bit of valdiation here.
1091 if (next->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) {
1092 /* Insert chk MUST be a last fragment */
1093 if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK)
1094 != SCTP_DATA_LAST_FRAG) {
1095 SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Next is FIRST, we must be LAST\n");
1096 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, its not a last!\n");
1097 snprintf(msg, sizeof(msg),
1098 "Expect only E-bit, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
1099 chk->rec.data.TSN_seq,
1100 chk->rec.data.stream_number,
1101 chk->rec.data.stream_seq);
1102 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
1103 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_10;
1104 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
1108 } else if ((next->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
1109 SCTP_DATA_MIDDLE_FRAG ||
1110 (next->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
1111 SCTP_DATA_LAST_FRAG) {
1113 * Insert chk CAN be MIDDLE or FIRST NOT
1116 if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
1117 SCTP_DATA_LAST_FRAG) {
1118 SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Next is a MIDDLE/LAST\n");
1119 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, new prev chunk is a LAST\n");
1120 snprintf(msg, sizeof(msg),
1121 "Didn't expect E-bit, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
1122 chk->rec.data.TSN_seq,
1123 chk->rec.data.stream_number,
1124 chk->rec.data.stream_seq);
1125 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
1126 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_11;
1127 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
1131 if (chk->rec.data.stream_number !=
1132 next->rec.data.stream_number) {
1134 * Huh, need the correct STR here,
1135 * they must be the same.
1137 SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Gak, Evil plot, ssn:%d not the same as at:%d\n",
1138 chk->rec.data.stream_number,
1139 next->rec.data.stream_number);
1140 snprintf(msg, sizeof(msg),
1141 "Required SID %4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
1142 next->rec.data.stream_number,
1143 chk->rec.data.TSN_seq,
1144 chk->rec.data.stream_number,
1145 chk->rec.data.stream_seq);
1146 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
1147 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_12;
1148 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
1152 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) !=
1153 (next->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
1155 * Huh, need the same ordering here,
1156 * they must be the same.
1158 SCTPDBG(SCTP_DEBUG_INDATA1, "Next check - Gak, Evil plot, U-bit not constant\n");
1159 snprintf(msg, sizeof(msg),
1160 "Expect U-bit=%d for TSN=%8.8x, got U-bit=%d",
1161 (next->rec.data.rcv_flags & SCTP_DATA_UNORDERED) ? 1 : 0,
1162 chk->rec.data.TSN_seq,
1163 (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) ? 1 : 0);
1164 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
1165 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_12;
1166 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
1170 if ((next->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0 &&
1171 chk->rec.data.stream_seq !=
1172 next->rec.data.stream_seq) {
1174 * Huh, need the correct STR here,
1175 * they must be the same.
1177 SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Gak, Evil plot, sseq:%d not the same as at:%d\n",
1178 chk->rec.data.stream_seq,
1179 next->rec.data.stream_seq);
1180 snprintf(msg, sizeof(msg),
1181 "Required SSN %4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
1182 next->rec.data.stream_seq,
1183 chk->rec.data.TSN_seq,
1184 chk->rec.data.stream_number,
1185 chk->rec.data.stream_seq);
1186 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
1187 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_13;
1188 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
1195 /* Do we need to do some delivery? check */
1196 sctp_deliver_reasm_check(stcb, asoc);
1200 * This is an unfortunate routine. It checks to make sure a evil guy is not
1201 * stuffing us full of bad packet fragments. A broken peer could also do this
1202 * but this is doubtful. It is to bad I must worry about evil crackers sigh
1206 sctp_does_tsn_belong_to_reasm(struct sctp_association *asoc,
1209 struct sctp_tmit_chunk *at;
1212 TAILQ_FOREACH(at, &asoc->reasmqueue, sctp_next) {
1213 if (SCTP_TSN_GT(TSN_seq, at->rec.data.TSN_seq)) {
1214 /* is it one bigger? */
1215 tsn_est = at->rec.data.TSN_seq + 1;
1216 if (tsn_est == TSN_seq) {
1217 /* yep. It better be a last then */
1218 if ((at->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) !=
1219 SCTP_DATA_LAST_FRAG) {
1221 * Ok this guy belongs next to a guy
1222 * that is NOT last, it should be a
1223 * middle/last, not a complete
1229 * This guy is ok since its a LAST
1230 * and the new chunk is a fully
1231 * self- contained one.
1236 } else if (TSN_seq == at->rec.data.TSN_seq) {
1237 /* Software error since I have a dup? */
1241 * Ok, 'at' is larger than new chunk but does it
1242 * need to be right before it.
1244 tsn_est = TSN_seq + 1;
1245 if (tsn_est == at->rec.data.TSN_seq) {
1246 /* Yep, It better be a first */
1247 if ((at->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) !=
1248 SCTP_DATA_FIRST_FRAG) {
1260 sctp_process_a_data_chunk(struct sctp_tcb *stcb, struct sctp_association *asoc,
1261 struct mbuf **m, int offset, struct sctp_data_chunk *ch, int chk_length,
1262 struct sctp_nets *net, uint32_t * high_tsn, int *abort_flag,
1263 int *break_flag, int last_chunk)
1265 /* Process a data chunk */
1266 /* struct sctp_tmit_chunk *chk; */
1267 struct sctp_tmit_chunk *chk;
1271 int need_reasm_check = 0;
1272 uint16_t strmno, strmseq;
1273 struct mbuf *op_err;
1274 char msg[SCTP_DIAG_INFO_LEN];
1275 struct sctp_queued_to_read *control;
1277 uint32_t protocol_id;
1278 uint8_t chunk_flags;
1279 struct sctp_stream_reset_list *liste;
1282 tsn = ntohl(ch->dp.tsn);
1283 chunk_flags = ch->ch.chunk_flags;
1284 if ((chunk_flags & SCTP_DATA_SACK_IMMEDIATELY) == SCTP_DATA_SACK_IMMEDIATELY) {
1285 asoc->send_sack = 1;
1287 protocol_id = ch->dp.protocol_id;
1288 ordered = ((chunk_flags & SCTP_DATA_UNORDERED) == 0);
1289 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
1290 sctp_log_map(tsn, asoc->cumulative_tsn, asoc->highest_tsn_inside_map, SCTP_MAP_TSN_ENTERS);
1295 SCTP_LTRACE_CHK(stcb->sctp_ep, stcb, ch->ch.chunk_type, tsn);
1296 if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
1297 /* It is a duplicate */
1298 SCTP_STAT_INCR(sctps_recvdupdata);
1299 if (asoc->numduptsns < SCTP_MAX_DUP_TSNS) {
1300 /* Record a dup for the next outbound sack */
1301 asoc->dup_tsns[asoc->numduptsns] = tsn;
1304 asoc->send_sack = 1;
1307 /* Calculate the number of TSN's between the base and this TSN */
1308 SCTP_CALC_TSN_TO_GAP(gap, tsn, asoc->mapping_array_base_tsn);
1309 if (gap >= (SCTP_MAPPING_ARRAY << 3)) {
1310 /* Can't hold the bit in the mapping at max array, toss it */
1313 if (gap >= (uint32_t) (asoc->mapping_array_size << 3)) {
1314 SCTP_TCB_LOCK_ASSERT(stcb);
1315 if (sctp_expand_mapping_array(asoc, gap)) {
1316 /* Can't expand, drop it */
1320 if (SCTP_TSN_GT(tsn, *high_tsn)) {
1323 /* See if we have received this one already */
1324 if (SCTP_IS_TSN_PRESENT(asoc->mapping_array, gap) ||
1325 SCTP_IS_TSN_PRESENT(asoc->nr_mapping_array, gap)) {
1326 SCTP_STAT_INCR(sctps_recvdupdata);
1327 if (asoc->numduptsns < SCTP_MAX_DUP_TSNS) {
1328 /* Record a dup for the next outbound sack */
1329 asoc->dup_tsns[asoc->numduptsns] = tsn;
1332 asoc->send_sack = 1;
1336 * Check to see about the GONE flag, duplicates would cause a sack
1337 * to be sent up above
1339 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
1340 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
1341 (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET))) {
1343 * wait a minute, this guy is gone, there is no longer a
1344 * receiver. Send peer an ABORT!
1346 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
1347 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
1352 * Now before going further we see if there is room. If NOT then we
1353 * MAY let one through only IF this TSN is the one we are waiting
1354 * for on a partial delivery API.
1357 /* now do the tests */
1358 if (((asoc->cnt_on_all_streams +
1359 asoc->cnt_on_reasm_queue +
1360 asoc->cnt_msg_on_sb) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue)) ||
1361 (((int)asoc->my_rwnd) <= 0)) {
1363 * When we have NO room in the rwnd we check to make sure
1364 * the reader is doing its job...
1366 if (stcb->sctp_socket->so_rcv.sb_cc) {
1367 /* some to read, wake-up */
1368 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1371 so = SCTP_INP_SO(stcb->sctp_ep);
1372 atomic_add_int(&stcb->asoc.refcnt, 1);
1373 SCTP_TCB_UNLOCK(stcb);
1374 SCTP_SOCKET_LOCK(so, 1);
1375 SCTP_TCB_LOCK(stcb);
1376 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1377 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1378 /* assoc was freed while we were unlocked */
1379 SCTP_SOCKET_UNLOCK(so, 1);
1383 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
1384 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1385 SCTP_SOCKET_UNLOCK(so, 1);
1388 /* now is it in the mapping array of what we have accepted? */
1389 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_map) &&
1390 SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) {
1391 /* Nope not in the valid range dump it */
1392 sctp_set_rwnd(stcb, asoc);
1393 if ((asoc->cnt_on_all_streams +
1394 asoc->cnt_on_reasm_queue +
1395 asoc->cnt_msg_on_sb) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue)) {
1396 SCTP_STAT_INCR(sctps_datadropchklmt);
1398 SCTP_STAT_INCR(sctps_datadroprwnd);
1404 strmno = ntohs(ch->dp.stream_id);
1405 if (strmno >= asoc->streamincnt) {
1406 struct sctp_paramhdr *phdr;
1409 mb = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) * 2),
1410 0, M_DONTWAIT, 1, MT_DATA);
1412 /* add some space up front so prepend will work well */
1413 SCTP_BUF_RESV_UF(mb, sizeof(struct sctp_chunkhdr));
1414 phdr = mtod(mb, struct sctp_paramhdr *);
1416 * Error causes are just param's and this one has
1417 * two back to back phdr, one with the error type
1418 * and size, the other with the streamid and a rsvd
1420 SCTP_BUF_LEN(mb) = (sizeof(struct sctp_paramhdr) * 2);
1421 phdr->param_type = htons(SCTP_CAUSE_INVALID_STREAM);
1422 phdr->param_length =
1423 htons(sizeof(struct sctp_paramhdr) * 2);
1425 /* We insert the stream in the type field */
1426 phdr->param_type = ch->dp.stream_id;
1427 /* And set the length to 0 for the rsvd field */
1428 phdr->param_length = 0;
1429 sctp_queue_op_err(stcb, mb);
1431 SCTP_STAT_INCR(sctps_badsid);
1432 SCTP_TCB_LOCK_ASSERT(stcb);
1433 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap);
1434 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) {
1435 asoc->highest_tsn_inside_nr_map = tsn;
1437 if (tsn == (asoc->cumulative_tsn + 1)) {
1438 /* Update cum-ack */
1439 asoc->cumulative_tsn = tsn;
1444 * Before we continue lets validate that we are not being fooled by
1445 * an evil attacker. We can only have 4k chunks based on our TSN
1446 * spread allowed by the mapping array 512 * 8 bits, so there is no
1447 * way our stream sequence numbers could have wrapped. We of course
1448 * only validate the FIRST fragment so the bit must be set.
1450 strmseq = ntohs(ch->dp.stream_sequence);
1451 #ifdef SCTP_ASOCLOG_OF_TSNS
1452 SCTP_TCB_LOCK_ASSERT(stcb);
1453 if (asoc->tsn_in_at >= SCTP_TSN_LOG_SIZE) {
1454 asoc->tsn_in_at = 0;
1455 asoc->tsn_in_wrapped = 1;
1457 asoc->in_tsnlog[asoc->tsn_in_at].tsn = tsn;
1458 asoc->in_tsnlog[asoc->tsn_in_at].strm = strmno;
1459 asoc->in_tsnlog[asoc->tsn_in_at].seq = strmseq;
1460 asoc->in_tsnlog[asoc->tsn_in_at].sz = chk_length;
1461 asoc->in_tsnlog[asoc->tsn_in_at].flgs = chunk_flags;
1462 asoc->in_tsnlog[asoc->tsn_in_at].stcb = (void *)stcb;
1463 asoc->in_tsnlog[asoc->tsn_in_at].in_pos = asoc->tsn_in_at;
1464 asoc->in_tsnlog[asoc->tsn_in_at].in_out = 1;
1467 if ((chunk_flags & SCTP_DATA_FIRST_FRAG) &&
1468 (TAILQ_EMPTY(&asoc->resetHead)) &&
1469 (chunk_flags & SCTP_DATA_UNORDERED) == 0 &&
1470 SCTP_SSN_GE(asoc->strmin[strmno].last_sequence_delivered, strmseq)) {
1471 /* The incoming sseq is behind where we last delivered? */
1472 SCTPDBG(SCTP_DEBUG_INDATA1, "EVIL/Broken-Dup S-SEQ:%d delivered:%d from peer, Abort!\n",
1473 strmseq, asoc->strmin[strmno].last_sequence_delivered);
1474 snprintf(msg, sizeof(msg), "Delivered SSN=%4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
1475 asoc->strmin[strmno].last_sequence_delivered,
1476 tsn, strmno, strmseq);
1477 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
1478 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_14;
1479 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
1483 /************************************
1484 * From here down we may find ch-> invalid
1485 * so its a good idea NOT to use it.
1486 *************************************/
1488 the_len = (chk_length - sizeof(struct sctp_data_chunk));
1489 if (last_chunk == 0) {
1490 dmbuf = SCTP_M_COPYM(*m,
1491 (offset + sizeof(struct sctp_data_chunk)),
1492 the_len, M_DONTWAIT);
1493 #ifdef SCTP_MBUF_LOGGING
1494 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
1497 for (mat = dmbuf; mat; mat = SCTP_BUF_NEXT(mat)) {
1498 if (SCTP_BUF_IS_EXTENDED(mat)) {
1499 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
1505 /* We can steal the last chunk */
1509 /* lop off the top part */
1510 m_adj(dmbuf, (offset + sizeof(struct sctp_data_chunk)));
1511 if (SCTP_BUF_NEXT(dmbuf) == NULL) {
1512 l_len = SCTP_BUF_LEN(dmbuf);
1515 * need to count up the size hopefully does not hit
1521 for (lat = dmbuf; lat; lat = SCTP_BUF_NEXT(lat)) {
1522 l_len += SCTP_BUF_LEN(lat);
1525 if (l_len > the_len) {
1526 /* Trim the end round bytes off too */
1527 m_adj(dmbuf, -(l_len - the_len));
1530 if (dmbuf == NULL) {
1531 SCTP_STAT_INCR(sctps_nomem);
1534 if ((chunk_flags & SCTP_DATA_NOT_FRAG) == SCTP_DATA_NOT_FRAG &&
1535 asoc->fragmented_delivery_inprogress == 0 &&
1536 TAILQ_EMPTY(&asoc->resetHead) &&
1538 ((uint16_t) (asoc->strmin[strmno].last_sequence_delivered + 1) == strmseq &&
1539 TAILQ_EMPTY(&asoc->strmin[strmno].inqueue)))) {
1540 /* Candidate for express delivery */
1542 * Its not fragmented, No PD-API is up, Nothing in the
1543 * delivery queue, Its un-ordered OR ordered and the next to
1544 * deliver AND nothing else is stuck on the stream queue,
1545 * And there is room for it in the socket buffer. Lets just
1546 * stuff it up the buffer....
1549 /* It would be nice to avoid this copy if we could :< */
1550 sctp_alloc_a_readq(stcb, control);
1551 sctp_build_readq_entry_mac(control, stcb, asoc->context, net, tsn,
1556 if (control == NULL) {
1557 goto failed_express_del;
1559 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap);
1560 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) {
1561 asoc->highest_tsn_inside_nr_map = tsn;
1563 sctp_add_to_readq(stcb->sctp_ep, stcb,
1564 control, &stcb->sctp_socket->so_rcv,
1565 1, SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED);
1567 if ((chunk_flags & SCTP_DATA_UNORDERED) == 0) {
1568 /* for ordered, bump what we delivered */
1569 asoc->strmin[strmno].last_sequence_delivered++;
1571 SCTP_STAT_INCR(sctps_recvexpress);
1572 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
1573 sctp_log_strm_del_alt(stcb, tsn, strmseq, strmno,
1574 SCTP_STR_LOG_FROM_EXPRS_DEL);
1578 goto finish_express_del;
1581 /* If we reach here this is a new chunk */
1584 /* Express for fragmented delivery? */
1585 if ((asoc->fragmented_delivery_inprogress) &&
1586 (stcb->asoc.control_pdapi) &&
1587 (asoc->str_of_pdapi == strmno) &&
1588 (asoc->ssn_of_pdapi == strmseq)
1590 control = stcb->asoc.control_pdapi;
1591 if ((chunk_flags & SCTP_DATA_FIRST_FRAG) == SCTP_DATA_FIRST_FRAG) {
1592 /* Can't be another first? */
1593 goto failed_pdapi_express_del;
1595 if (tsn == (control->sinfo_tsn + 1)) {
1596 /* Yep, we can add it on */
1599 if (chunk_flags & SCTP_DATA_LAST_FRAG) {
1602 if (sctp_append_to_readq(stcb->sctp_ep, stcb, control, dmbuf, end,
1604 &stcb->sctp_socket->so_rcv)) {
1605 SCTP_PRINTF("Append fails end:%d\n", end);
1606 goto failed_pdapi_express_del;
1608 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap);
1609 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) {
1610 asoc->highest_tsn_inside_nr_map = tsn;
1612 SCTP_STAT_INCR(sctps_recvexpressm);
1613 asoc->tsn_last_delivered = tsn;
1614 asoc->fragment_flags = chunk_flags;
1615 asoc->tsn_of_pdapi_last_delivered = tsn;
1616 asoc->last_flags_delivered = chunk_flags;
1617 asoc->last_strm_seq_delivered = strmseq;
1618 asoc->last_strm_no_delivered = strmno;
1620 /* clean up the flags and such */
1621 asoc->fragmented_delivery_inprogress = 0;
1622 if ((chunk_flags & SCTP_DATA_UNORDERED) == 0) {
1623 asoc->strmin[strmno].last_sequence_delivered++;
1625 stcb->asoc.control_pdapi = NULL;
1626 if (TAILQ_EMPTY(&asoc->reasmqueue) == 0) {
1628 * There could be another message
1631 need_reasm_check = 1;
1635 goto finish_express_del;
1638 failed_pdapi_express_del:
1640 if (SCTP_BASE_SYSCTL(sctp_do_drain) == 0) {
1641 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap);
1642 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) {
1643 asoc->highest_tsn_inside_nr_map = tsn;
1646 SCTP_SET_TSN_PRESENT(asoc->mapping_array, gap);
1647 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_map)) {
1648 asoc->highest_tsn_inside_map = tsn;
1651 if ((chunk_flags & SCTP_DATA_NOT_FRAG) != SCTP_DATA_NOT_FRAG) {
1652 sctp_alloc_a_chunk(stcb, chk);
1654 /* No memory so we drop the chunk */
1655 SCTP_STAT_INCR(sctps_nomem);
1656 if (last_chunk == 0) {
1657 /* we copied it, free the copy */
1658 sctp_m_freem(dmbuf);
1662 chk->rec.data.TSN_seq = tsn;
1663 chk->no_fr_allowed = 0;
1664 chk->rec.data.stream_seq = strmseq;
1665 chk->rec.data.stream_number = strmno;
1666 chk->rec.data.payloadtype = protocol_id;
1667 chk->rec.data.context = stcb->asoc.context;
1668 chk->rec.data.doing_fast_retransmit = 0;
1669 chk->rec.data.rcv_flags = chunk_flags;
1671 chk->send_size = the_len;
1673 atomic_add_int(&net->ref_count, 1);
1676 sctp_alloc_a_readq(stcb, control);
1677 sctp_build_readq_entry_mac(control, stcb, asoc->context, net, tsn,
1682 if (control == NULL) {
1683 /* No memory so we drop the chunk */
1684 SCTP_STAT_INCR(sctps_nomem);
1685 if (last_chunk == 0) {
1686 /* we copied it, free the copy */
1687 sctp_m_freem(dmbuf);
1691 control->length = the_len;
1694 /* Mark it as received */
1695 /* Now queue it where it belongs */
1696 if (control != NULL) {
1697 /* First a sanity check */
1698 if (asoc->fragmented_delivery_inprogress) {
1700 * Ok, we have a fragmented delivery in progress if
1701 * this chunk is next to deliver OR belongs in our
1702 * view to the reassembly, the peer is evil or
1705 uint32_t estimate_tsn;
1707 estimate_tsn = asoc->tsn_last_delivered + 1;
1708 if (TAILQ_EMPTY(&asoc->reasmqueue) &&
1709 (estimate_tsn == control->sinfo_tsn)) {
1710 /* Evil/Broke peer */
1711 sctp_m_freem(control->data);
1712 control->data = NULL;
1713 if (control->whoFrom) {
1714 sctp_free_remote_addr(control->whoFrom);
1715 control->whoFrom = NULL;
1717 sctp_free_a_readq(stcb, control);
1718 snprintf(msg, sizeof(msg), "Reas. queue emtpy, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
1719 tsn, strmno, strmseq);
1720 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
1721 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_15;
1722 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
1729 if (sctp_does_tsn_belong_to_reasm(asoc, control->sinfo_tsn)) {
1730 sctp_m_freem(control->data);
1731 control->data = NULL;
1732 if (control->whoFrom) {
1733 sctp_free_remote_addr(control->whoFrom);
1734 control->whoFrom = NULL;
1736 sctp_free_a_readq(stcb, control);
1737 snprintf(msg, sizeof(msg), "PD ongoing, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
1738 tsn, strmno, strmseq);
1739 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
1740 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_16;
1741 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
1750 /* No PDAPI running */
1751 if (!TAILQ_EMPTY(&asoc->reasmqueue)) {
1753 * Reassembly queue is NOT empty validate
1754 * that this tsn does not need to be in
1755 * reasembly queue. If it does then our peer
1756 * is broken or evil.
1758 if (sctp_does_tsn_belong_to_reasm(asoc, control->sinfo_tsn)) {
1759 sctp_m_freem(control->data);
1760 control->data = NULL;
1761 if (control->whoFrom) {
1762 sctp_free_remote_addr(control->whoFrom);
1763 control->whoFrom = NULL;
1765 sctp_free_a_readq(stcb, control);
1766 snprintf(msg, sizeof(msg), "No PD ongoing, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
1767 tsn, strmno, strmseq);
1768 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
1769 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_17;
1770 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
1779 /* ok, if we reach here we have passed the sanity checks */
1780 if (chunk_flags & SCTP_DATA_UNORDERED) {
1781 /* queue directly into socket buffer */
1782 sctp_mark_non_revokable(asoc, control->sinfo_tsn);
1783 sctp_add_to_readq(stcb->sctp_ep, stcb,
1785 &stcb->sctp_socket->so_rcv, 1, SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED);
1788 * Special check for when streams are resetting. We
1789 * could be more smart about this and check the
1790 * actual stream to see if it is not being reset..
1791 * that way we would not create a HOLB when amongst
1792 * streams being reset and those not being reset.
1794 * We take complete messages that have a stream reset
1795 * intervening (aka the TSN is after where our
1796 * cum-ack needs to be) off and put them on a
1797 * pending_reply_queue. The reassembly ones we do
1798 * not have to worry about since they are all sorted
1799 * and proceessed by TSN order. It is only the
1800 * singletons I must worry about.
1802 if (((liste = TAILQ_FIRST(&asoc->resetHead)) != NULL) &&
1803 SCTP_TSN_GT(tsn, liste->tsn)) {
1805 * yep its past where we need to reset... go
1806 * ahead and queue it.
1808 if (TAILQ_EMPTY(&asoc->pending_reply_queue)) {
1810 TAILQ_INSERT_TAIL(&asoc->pending_reply_queue, control, next);
1812 struct sctp_queued_to_read *ctlOn,
1814 unsigned char inserted = 0;
1816 TAILQ_FOREACH_SAFE(ctlOn, &asoc->pending_reply_queue, next, nctlOn) {
1817 if (SCTP_TSN_GT(control->sinfo_tsn, ctlOn->sinfo_tsn)) {
1821 TAILQ_INSERT_BEFORE(ctlOn, control, next);
1826 if (inserted == 0) {
1828 * must be put at end, use
1829 * prevP (all setup from
1830 * loop) to setup nextP.
1832 TAILQ_INSERT_TAIL(&asoc->pending_reply_queue, control, next);
1836 sctp_queue_data_to_stream(stcb, asoc, control, abort_flag);
1846 /* Into the re-assembly queue */
1847 sctp_queue_data_for_reasm(stcb, asoc, chk, abort_flag);
1850 * the assoc is now gone and chk was put onto the
1851 * reasm queue, which has all been freed.
1860 if (tsn == (asoc->cumulative_tsn + 1)) {
1861 /* Update cum-ack */
1862 asoc->cumulative_tsn = tsn;
1868 SCTP_STAT_INCR_COUNTER64(sctps_inorderchunks);
1870 SCTP_STAT_INCR_COUNTER64(sctps_inunorderchunks);
1872 SCTP_STAT_INCR(sctps_recvdata);
1873 /* Set it present please */
1874 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
1875 sctp_log_strm_del_alt(stcb, tsn, strmseq, strmno, SCTP_STR_LOG_FROM_MARK_TSN);
1877 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
1878 sctp_log_map(asoc->mapping_array_base_tsn, asoc->cumulative_tsn,
1879 asoc->highest_tsn_inside_map, SCTP_MAP_PREPARE_SLIDE);
1881 /* check the special flag for stream resets */
1882 if (((liste = TAILQ_FIRST(&asoc->resetHead)) != NULL) &&
1883 SCTP_TSN_GE(asoc->cumulative_tsn, liste->tsn)) {
1885 * we have finished working through the backlogged TSN's now
1886 * time to reset streams. 1: call reset function. 2: free
1887 * pending_reply space 3: distribute any chunks in
1888 * pending_reply_queue.
1890 struct sctp_queued_to_read *ctl, *nctl;
1892 sctp_reset_in_stream(stcb, liste->number_entries, liste->list_of_streams);
1893 TAILQ_REMOVE(&asoc->resetHead, liste, next_resp);
1894 SCTP_FREE(liste, SCTP_M_STRESET);
1895 /* sa_ignore FREED_MEMORY */
1896 liste = TAILQ_FIRST(&asoc->resetHead);
1897 if (TAILQ_EMPTY(&asoc->resetHead)) {
1898 /* All can be removed */
1899 TAILQ_FOREACH_SAFE(ctl, &asoc->pending_reply_queue, next, nctl) {
1900 TAILQ_REMOVE(&asoc->pending_reply_queue, ctl, next);
1901 sctp_queue_data_to_stream(stcb, asoc, ctl, abort_flag);
1907 TAILQ_FOREACH_SAFE(ctl, &asoc->pending_reply_queue, next, nctl) {
1908 if (SCTP_TSN_GT(ctl->sinfo_tsn, liste->tsn)) {
1912 * if ctl->sinfo_tsn is <= liste->tsn we can
1913 * process it which is the NOT of
1914 * ctl->sinfo_tsn > liste->tsn
1916 TAILQ_REMOVE(&asoc->pending_reply_queue, ctl, next);
1917 sctp_queue_data_to_stream(stcb, asoc, ctl, abort_flag);
1924 * Now service re-assembly to pick up anything that has been
1925 * held on reassembly queue?
1927 sctp_deliver_reasm_check(stcb, asoc);
1928 need_reasm_check = 0;
1930 if (need_reasm_check) {
1931 /* Another one waits ? */
1932 sctp_deliver_reasm_check(stcb, asoc);
1937 int8_t sctp_map_lookup_tab[256] = {
1938 0, 1, 0, 2, 0, 1, 0, 3,
1939 0, 1, 0, 2, 0, 1, 0, 4,
1940 0, 1, 0, 2, 0, 1, 0, 3,
1941 0, 1, 0, 2, 0, 1, 0, 5,
1942 0, 1, 0, 2, 0, 1, 0, 3,
1943 0, 1, 0, 2, 0, 1, 0, 4,
1944 0, 1, 0, 2, 0, 1, 0, 3,
1945 0, 1, 0, 2, 0, 1, 0, 6,
1946 0, 1, 0, 2, 0, 1, 0, 3,
1947 0, 1, 0, 2, 0, 1, 0, 4,
1948 0, 1, 0, 2, 0, 1, 0, 3,
1949 0, 1, 0, 2, 0, 1, 0, 5,
1950 0, 1, 0, 2, 0, 1, 0, 3,
1951 0, 1, 0, 2, 0, 1, 0, 4,
1952 0, 1, 0, 2, 0, 1, 0, 3,
1953 0, 1, 0, 2, 0, 1, 0, 7,
1954 0, 1, 0, 2, 0, 1, 0, 3,
1955 0, 1, 0, 2, 0, 1, 0, 4,
1956 0, 1, 0, 2, 0, 1, 0, 3,
1957 0, 1, 0, 2, 0, 1, 0, 5,
1958 0, 1, 0, 2, 0, 1, 0, 3,
1959 0, 1, 0, 2, 0, 1, 0, 4,
1960 0, 1, 0, 2, 0, 1, 0, 3,
1961 0, 1, 0, 2, 0, 1, 0, 6,
1962 0, 1, 0, 2, 0, 1, 0, 3,
1963 0, 1, 0, 2, 0, 1, 0, 4,
1964 0, 1, 0, 2, 0, 1, 0, 3,
1965 0, 1, 0, 2, 0, 1, 0, 5,
1966 0, 1, 0, 2, 0, 1, 0, 3,
1967 0, 1, 0, 2, 0, 1, 0, 4,
1968 0, 1, 0, 2, 0, 1, 0, 3,
1969 0, 1, 0, 2, 0, 1, 0, 8
1974 sctp_slide_mapping_arrays(struct sctp_tcb *stcb)
1977 * Now we also need to check the mapping array in a couple of ways.
1978 * 1) Did we move the cum-ack point?
1980 * When you first glance at this you might think that all entries that
1981 * make up the postion of the cum-ack would be in the nr-mapping
1982 * array only.. i.e. things up to the cum-ack are always
1983 * deliverable. Thats true with one exception, when its a fragmented
1984 * message we may not deliver the data until some threshold (or all
1985 * of it) is in place. So we must OR the nr_mapping_array and
1986 * mapping_array to get a true picture of the cum-ack.
1988 struct sctp_association *asoc;
1991 int slide_from, slide_end, lgap, distance;
1992 uint32_t old_cumack, old_base, old_highest, highest_tsn;
1996 old_cumack = asoc->cumulative_tsn;
1997 old_base = asoc->mapping_array_base_tsn;
1998 old_highest = asoc->highest_tsn_inside_map;
2000 * We could probably improve this a small bit by calculating the
2001 * offset of the current cum-ack as the starting point.
2004 for (slide_from = 0; slide_from < stcb->asoc.mapping_array_size; slide_from++) {
2005 val = asoc->nr_mapping_array[slide_from] | asoc->mapping_array[slide_from];
2009 /* there is a 0 bit */
2010 at += sctp_map_lookup_tab[val];
2014 asoc->cumulative_tsn = asoc->mapping_array_base_tsn + (at - 1);
2016 if (SCTP_TSN_GT(asoc->cumulative_tsn, asoc->highest_tsn_inside_map) &&
2017 SCTP_TSN_GT(asoc->cumulative_tsn, asoc->highest_tsn_inside_nr_map)) {
2019 panic("huh, cumack 0x%x greater than high-tsn 0x%x in map",
2020 asoc->cumulative_tsn, asoc->highest_tsn_inside_map);
2022 SCTP_PRINTF("huh, cumack 0x%x greater than high-tsn 0x%x in map - should panic?\n",
2023 asoc->cumulative_tsn, asoc->highest_tsn_inside_map);
2024 sctp_print_mapping_array(asoc);
2025 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
2026 sctp_log_map(0, 6, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
2028 asoc->highest_tsn_inside_map = asoc->cumulative_tsn;
2029 asoc->highest_tsn_inside_nr_map = asoc->cumulative_tsn;
2032 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->highest_tsn_inside_map)) {
2033 highest_tsn = asoc->highest_tsn_inside_nr_map;
2035 highest_tsn = asoc->highest_tsn_inside_map;
2037 if ((asoc->cumulative_tsn == highest_tsn) && (at >= 8)) {
2038 /* The complete array was completed by a single FR */
2039 /* highest becomes the cum-ack */
2047 /* clear the array */
2048 clr = ((at + 7) >> 3);
2049 if (clr > asoc->mapping_array_size) {
2050 clr = asoc->mapping_array_size;
2052 memset(asoc->mapping_array, 0, clr);
2053 memset(asoc->nr_mapping_array, 0, clr);
2055 for (i = 0; i < asoc->mapping_array_size; i++) {
2056 if ((asoc->mapping_array[i]) || (asoc->nr_mapping_array[i])) {
2057 SCTP_PRINTF("Error Mapping array's not clean at clear\n");
2058 sctp_print_mapping_array(asoc);
2062 asoc->mapping_array_base_tsn = asoc->cumulative_tsn + 1;
2063 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map = asoc->cumulative_tsn;
2064 } else if (at >= 8) {
2065 /* we can slide the mapping array down */
2066 /* slide_from holds where we hit the first NON 0xff byte */
2069 * now calculate the ceiling of the move using our highest
2072 SCTP_CALC_TSN_TO_GAP(lgap, highest_tsn, asoc->mapping_array_base_tsn);
2073 slide_end = (lgap >> 3);
2074 if (slide_end < slide_from) {
2075 sctp_print_mapping_array(asoc);
2077 panic("impossible slide");
2079 SCTP_PRINTF("impossible slide lgap:%x slide_end:%x slide_from:%x? at:%d\n",
2080 lgap, slide_end, slide_from, at);
2084 if (slide_end > asoc->mapping_array_size) {
2086 panic("would overrun buffer");
2088 SCTP_PRINTF("Gak, would have overrun map end:%d slide_end:%d\n",
2089 asoc->mapping_array_size, slide_end);
2090 slide_end = asoc->mapping_array_size;
2093 distance = (slide_end - slide_from) + 1;
2094 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
2095 sctp_log_map(old_base, old_cumack, old_highest,
2096 SCTP_MAP_PREPARE_SLIDE);
2097 sctp_log_map((uint32_t) slide_from, (uint32_t) slide_end,
2098 (uint32_t) lgap, SCTP_MAP_SLIDE_FROM);
2100 if (distance + slide_from > asoc->mapping_array_size ||
2103 * Here we do NOT slide forward the array so that
2104 * hopefully when more data comes in to fill it up
2105 * we will be able to slide it forward. Really I
2106 * don't think this should happen :-0
2109 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
2110 sctp_log_map((uint32_t) distance, (uint32_t) slide_from,
2111 (uint32_t) asoc->mapping_array_size,
2112 SCTP_MAP_SLIDE_NONE);
2117 for (ii = 0; ii < distance; ii++) {
2118 asoc->mapping_array[ii] = asoc->mapping_array[slide_from + ii];
2119 asoc->nr_mapping_array[ii] = asoc->nr_mapping_array[slide_from + ii];
2122 for (ii = distance; ii < asoc->mapping_array_size; ii++) {
2123 asoc->mapping_array[ii] = 0;
2124 asoc->nr_mapping_array[ii] = 0;
2126 if (asoc->highest_tsn_inside_map + 1 == asoc->mapping_array_base_tsn) {
2127 asoc->highest_tsn_inside_map += (slide_from << 3);
2129 if (asoc->highest_tsn_inside_nr_map + 1 == asoc->mapping_array_base_tsn) {
2130 asoc->highest_tsn_inside_nr_map += (slide_from << 3);
2132 asoc->mapping_array_base_tsn += (slide_from << 3);
2133 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
2134 sctp_log_map(asoc->mapping_array_base_tsn,
2135 asoc->cumulative_tsn, asoc->highest_tsn_inside_map,
2136 SCTP_MAP_SLIDE_RESULT);
2143 sctp_sack_check(struct sctp_tcb *stcb, int was_a_gap)
2145 struct sctp_association *asoc;
2146 uint32_t highest_tsn;
2149 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->highest_tsn_inside_map)) {
2150 highest_tsn = asoc->highest_tsn_inside_nr_map;
2152 highest_tsn = asoc->highest_tsn_inside_map;
2156 * Now we need to see if we need to queue a sack or just start the
2157 * timer (if allowed).
2159 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
2161 * Ok special case, in SHUTDOWN-SENT case. here we maker
2162 * sure SACK timer is off and instead send a SHUTDOWN and a
2165 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
2166 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
2167 stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_INDATA + SCTP_LOC_18);
2169 sctp_send_shutdown(stcb,
2170 ((stcb->asoc.alternate) ? stcb->asoc.alternate : stcb->asoc.primary_destination));
2171 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
2175 /* is there a gap now ? */
2176 is_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
2179 * CMT DAC algorithm: increase number of packets received
2182 stcb->asoc.cmt_dac_pkts_rcvd++;
2184 if ((stcb->asoc.send_sack == 1) || /* We need to send a
2186 ((was_a_gap) && (is_a_gap == 0)) || /* was a gap, but no
2188 (stcb->asoc.numduptsns) || /* we have dup's */
2189 (is_a_gap) || /* is still a gap */
2190 (stcb->asoc.delayed_ack == 0) || /* Delayed sack disabled */
2191 (stcb->asoc.data_pkts_seen >= stcb->asoc.sack_freq) /* hit limit of pkts */
2194 if ((stcb->asoc.sctp_cmt_on_off > 0) &&
2195 (SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) &&
2196 (stcb->asoc.send_sack == 0) &&
2197 (stcb->asoc.numduptsns == 0) &&
2198 (stcb->asoc.delayed_ack) &&
2199 (!SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer))) {
2202 * CMT DAC algorithm: With CMT, delay acks
2203 * even in the face of
2205 * reordering. Therefore, if acks that do not
2206 * have to be sent because of the above
2207 * reasons, will be delayed. That is, acks
2208 * that would have been sent due to gap
2209 * reports will be delayed with DAC. Start
2210 * the delayed ack timer.
2212 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
2213 stcb->sctp_ep, stcb, NULL);
2216 * Ok we must build a SACK since the timer
2217 * is pending, we got our first packet OR
2218 * there are gaps or duplicates.
2220 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
2221 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
2224 if (!SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
2225 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
2226 stcb->sctp_ep, stcb, NULL);
2233 sctp_service_queues(struct sctp_tcb *stcb, struct sctp_association *asoc)
2235 struct sctp_tmit_chunk *chk;
2236 uint32_t tsize, pd_point;
2239 if (asoc->fragmented_delivery_inprogress) {
2240 sctp_service_reassembly(stcb, asoc);
2242 /* Can we proceed further, i.e. the PD-API is complete */
2243 if (asoc->fragmented_delivery_inprogress) {
2248 * Now is there some other chunk I can deliver from the reassembly
2252 chk = TAILQ_FIRST(&asoc->reasmqueue);
2254 asoc->size_on_reasm_queue = 0;
2255 asoc->cnt_on_reasm_queue = 0;
2258 nxt_todel = asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered + 1;
2259 if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) &&
2260 ((nxt_todel == chk->rec.data.stream_seq) ||
2261 (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED))) {
2263 * Yep the first one is here. We setup to start reception,
2264 * by backing down the TSN just in case we can't deliver.
2268 * Before we start though either all of the message should
2269 * be here or the socket buffer max or nothing on the
2270 * delivery queue and something can be delivered.
2272 if (stcb->sctp_socket) {
2273 pd_point = min(SCTP_SB_LIMIT_RCV(stcb->sctp_socket) >> SCTP_PARTIAL_DELIVERY_SHIFT,
2274 stcb->sctp_ep->partial_delivery_point);
2276 pd_point = stcb->sctp_ep->partial_delivery_point;
2278 if (sctp_is_all_msg_on_reasm(asoc, &tsize) || (tsize >= pd_point)) {
2279 asoc->fragmented_delivery_inprogress = 1;
2280 asoc->tsn_last_delivered = chk->rec.data.TSN_seq - 1;
2281 asoc->str_of_pdapi = chk->rec.data.stream_number;
2282 asoc->ssn_of_pdapi = chk->rec.data.stream_seq;
2283 asoc->pdapi_ppid = chk->rec.data.payloadtype;
2284 asoc->fragment_flags = chk->rec.data.rcv_flags;
2285 sctp_service_reassembly(stcb, asoc);
2286 if (asoc->fragmented_delivery_inprogress == 0) {
2294 sctp_process_data(struct mbuf **mm, int iphlen, int *offset, int length,
2295 struct sockaddr *src, struct sockaddr *dst,
2296 struct sctphdr *sh, struct sctp_inpcb *inp,
2297 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t * high_tsn,
2298 uint8_t use_mflowid, uint32_t mflowid,
2299 uint32_t vrf_id, uint16_t port)
2301 struct sctp_data_chunk *ch, chunk_buf;
2302 struct sctp_association *asoc;
2303 int num_chunks = 0; /* number of control chunks processed */
2305 int chk_length, break_flag, last_chunk;
2306 int abort_flag = 0, was_a_gap;
2308 uint32_t highest_tsn;
2311 sctp_set_rwnd(stcb, &stcb->asoc);
2314 SCTP_TCB_LOCK_ASSERT(stcb);
2316 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->highest_tsn_inside_map)) {
2317 highest_tsn = asoc->highest_tsn_inside_nr_map;
2319 highest_tsn = asoc->highest_tsn_inside_map;
2321 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
2323 * setup where we got the last DATA packet from for any SACK that
2324 * may need to go out. Don't bump the net. This is done ONLY when a
2325 * chunk is assigned.
2327 asoc->last_data_chunk_from = net;
2330 * Now before we proceed we must figure out if this is a wasted
2331 * cluster... i.e. it is a small packet sent in and yet the driver
2332 * underneath allocated a full cluster for it. If so we must copy it
2333 * to a smaller mbuf and free up the cluster mbuf. This will help
2334 * with cluster starvation. Note for __Panda__ we don't do this
2335 * since it has clusters all the way down to 64 bytes.
2337 if (SCTP_BUF_LEN(m) < (long)MLEN && SCTP_BUF_NEXT(m) == NULL) {
2338 /* we only handle mbufs that are singletons.. not chains */
2339 m = sctp_get_mbuf_for_msg(SCTP_BUF_LEN(m), 0, M_DONTWAIT, 1, MT_DATA);
2341 /* ok lets see if we can copy the data up */
2344 /* get the pointers and copy */
2345 to = mtod(m, caddr_t *);
2346 from = mtod((*mm), caddr_t *);
2347 memcpy(to, from, SCTP_BUF_LEN((*mm)));
2348 /* copy the length and free up the old */
2349 SCTP_BUF_LEN(m) = SCTP_BUF_LEN((*mm));
2351 /* sucess, back copy */
2354 /* We are in trouble in the mbuf world .. yikes */
2358 /* get pointer to the first chunk header */
2359 ch = (struct sctp_data_chunk *)sctp_m_getptr(m, *offset,
2360 sizeof(struct sctp_data_chunk), (uint8_t *) & chunk_buf);
2365 * process all DATA chunks...
2367 *high_tsn = asoc->cumulative_tsn;
2369 asoc->data_pkts_seen++;
2370 while (stop_proc == 0) {
2371 /* validate chunk length */
2372 chk_length = ntohs(ch->ch.chunk_length);
2373 if (length - *offset < chk_length) {
2374 /* all done, mutulated chunk */
2378 if (ch->ch.chunk_type == SCTP_DATA) {
2379 if ((size_t)chk_length < sizeof(struct sctp_data_chunk)) {
2381 * Need to send an abort since we had a
2382 * invalid data chunk.
2384 struct mbuf *op_err;
2385 char msg[SCTP_DIAG_INFO_LEN];
2387 snprintf(msg, sizeof(msg), "DATA chunk of length %d",
2389 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
2390 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_19;
2391 sctp_abort_association(inp, stcb, m, iphlen,
2392 src, dst, sh, op_err,
2393 use_mflowid, mflowid,
2397 if ((size_t)chk_length == sizeof(struct sctp_data_chunk)) {
2399 * Need to send an abort since we had an
2402 struct mbuf *op_err;
2404 op_err = sctp_generate_no_user_data_cause(ch->dp.tsn);
2405 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_19;
2406 sctp_abort_association(inp, stcb, m, iphlen,
2407 src, dst, sh, op_err,
2408 use_mflowid, mflowid,
2412 #ifdef SCTP_AUDITING_ENABLED
2413 sctp_audit_log(0xB1, 0);
2415 if (SCTP_SIZE32(chk_length) == (length - *offset)) {
2420 if (sctp_process_a_data_chunk(stcb, asoc, mm, *offset, ch,
2421 chk_length, net, high_tsn, &abort_flag, &break_flag,
2430 * Set because of out of rwnd space and no
2431 * drop rep space left.
2437 /* not a data chunk in the data region */
2438 switch (ch->ch.chunk_type) {
2439 case SCTP_INITIATION:
2440 case SCTP_INITIATION_ACK:
2441 case SCTP_SELECTIVE_ACK:
2442 case SCTP_NR_SELECTIVE_ACK:
2443 case SCTP_HEARTBEAT_REQUEST:
2444 case SCTP_HEARTBEAT_ACK:
2445 case SCTP_ABORT_ASSOCIATION:
2447 case SCTP_SHUTDOWN_ACK:
2448 case SCTP_OPERATION_ERROR:
2449 case SCTP_COOKIE_ECHO:
2450 case SCTP_COOKIE_ACK:
2453 case SCTP_SHUTDOWN_COMPLETE:
2454 case SCTP_AUTHENTICATION:
2455 case SCTP_ASCONF_ACK:
2456 case SCTP_PACKET_DROPPED:
2457 case SCTP_STREAM_RESET:
2458 case SCTP_FORWARD_CUM_TSN:
2461 * Now, what do we do with KNOWN chunks that
2462 * are NOT in the right place?
2464 * For now, I do nothing but ignore them. We
2465 * may later want to add sysctl stuff to
2466 * switch out and do either an ABORT() or
2467 * possibly process them.
2469 if (SCTP_BASE_SYSCTL(sctp_strict_data_order)) {
2470 struct mbuf *op_err;
2472 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, "");
2473 sctp_abort_association(inp, stcb,
2477 use_mflowid, mflowid,
2483 /* unknown chunk type, use bit rules */
2484 if (ch->ch.chunk_type & 0x40) {
2485 /* Add a error report to the queue */
2487 struct sctp_paramhdr *phd;
2489 merr = sctp_get_mbuf_for_msg(sizeof(*phd), 0, M_DONTWAIT, 1, MT_DATA);
2491 phd = mtod(merr, struct sctp_paramhdr *);
2493 * We cheat and use param
2494 * type since we did not
2495 * bother to define a error
2496 * cause struct. They are
2497 * the same basic format
2498 * with different names.
2501 htons(SCTP_CAUSE_UNRECOG_CHUNK);
2503 htons(chk_length + sizeof(*phd));
2504 SCTP_BUF_LEN(merr) = sizeof(*phd);
2505 SCTP_BUF_NEXT(merr) = SCTP_M_COPYM(m, *offset, chk_length, M_DONTWAIT);
2506 if (SCTP_BUF_NEXT(merr)) {
2507 if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(merr), SCTP_SIZE32(chk_length) - chk_length, NULL)) {
2510 sctp_queue_op_err(stcb, merr);
2517 if ((ch->ch.chunk_type & 0x80) == 0) {
2518 /* discard the rest of this packet */
2520 } /* else skip this bad chunk and
2523 } /* switch of chunk type */
2525 *offset += SCTP_SIZE32(chk_length);
2526 if ((*offset >= length) || stop_proc) {
2527 /* no more data left in the mbuf chain */
2531 ch = (struct sctp_data_chunk *)sctp_m_getptr(m, *offset,
2532 sizeof(struct sctp_data_chunk), (uint8_t *) & chunk_buf);
2541 * we need to report rwnd overrun drops.
2543 sctp_send_packet_dropped(stcb, net, *mm, length, iphlen, 0);
2547 * Did we get data, if so update the time for auto-close and
2548 * give peer credit for being alive.
2550 SCTP_STAT_INCR(sctps_recvpktwithdata);
2551 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
2552 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
2553 stcb->asoc.overall_error_count,
2555 SCTP_FROM_SCTP_INDATA,
2558 stcb->asoc.overall_error_count = 0;
2559 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_last_rcvd);
2561 /* now service all of the reassm queue if needed */
2562 if (!(TAILQ_EMPTY(&asoc->reasmqueue)))
2563 sctp_service_queues(stcb, asoc);
2565 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
2566 /* Assure that we ack right away */
2567 stcb->asoc.send_sack = 1;
2569 /* Start a sack timer or QUEUE a SACK for sending */
2570 sctp_sack_check(stcb, was_a_gap);
2575 sctp_process_segment_range(struct sctp_tcb *stcb, struct sctp_tmit_chunk **p_tp1, uint32_t last_tsn,
2576 uint16_t frag_strt, uint16_t frag_end, int nr_sacking,
2578 uint32_t * biggest_newly_acked_tsn,
2579 uint32_t * this_sack_lowest_newack,
2582 struct sctp_tmit_chunk *tp1;
2583 unsigned int theTSN;
2584 int j, wake_him = 0, circled = 0;
2586 /* Recover the tp1 we last saw */
2589 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue);
2591 for (j = frag_strt; j <= frag_end; j++) {
2592 theTSN = j + last_tsn;
2594 if (tp1->rec.data.doing_fast_retransmit)
2598 * CMT: CUCv2 algorithm. For each TSN being
2599 * processed from the sent queue, track the
2600 * next expected pseudo-cumack, or
2601 * rtx_pseudo_cumack, if required. Separate
2602 * cumack trackers for first transmissions,
2603 * and retransmissions.
2605 if ((tp1->whoTo->find_pseudo_cumack == 1) && (tp1->sent < SCTP_DATAGRAM_RESEND) &&
2606 (tp1->snd_count == 1)) {
2607 tp1->whoTo->pseudo_cumack = tp1->rec.data.TSN_seq;
2608 tp1->whoTo->find_pseudo_cumack = 0;
2610 if ((tp1->whoTo->find_rtx_pseudo_cumack == 1) && (tp1->sent < SCTP_DATAGRAM_RESEND) &&
2611 (tp1->snd_count > 1)) {
2612 tp1->whoTo->rtx_pseudo_cumack = tp1->rec.data.TSN_seq;
2613 tp1->whoTo->find_rtx_pseudo_cumack = 0;
2615 if (tp1->rec.data.TSN_seq == theTSN) {
2616 if (tp1->sent != SCTP_DATAGRAM_UNSENT) {
2618 * must be held until
2621 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
2623 * If it is less than RESEND, it is
2624 * now no-longer in flight.
2625 * Higher values may already be set
2626 * via previous Gap Ack Blocks...
2627 * i.e. ACKED or RESEND.
2629 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq,
2630 *biggest_newly_acked_tsn)) {
2631 *biggest_newly_acked_tsn = tp1->rec.data.TSN_seq;
2634 * CMT: SFR algo (and HTNA) - set
2635 * saw_newack to 1 for dest being
2636 * newly acked. update
2637 * this_sack_highest_newack if
2640 if (tp1->rec.data.chunk_was_revoked == 0)
2641 tp1->whoTo->saw_newack = 1;
2643 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq,
2644 tp1->whoTo->this_sack_highest_newack)) {
2645 tp1->whoTo->this_sack_highest_newack =
2646 tp1->rec.data.TSN_seq;
2649 * CMT DAC algo: also update
2650 * this_sack_lowest_newack
2652 if (*this_sack_lowest_newack == 0) {
2653 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
2654 sctp_log_sack(*this_sack_lowest_newack,
2656 tp1->rec.data.TSN_seq,
2659 SCTP_LOG_TSN_ACKED);
2661 *this_sack_lowest_newack = tp1->rec.data.TSN_seq;
2664 * CMT: CUCv2 algorithm. If (rtx-)pseudo-cumack for corresp
2665 * dest is being acked, then we have a new (rtx-)pseudo-cumack. Set
2666 * new_(rtx_)pseudo_cumack to TRUE so that the cwnd for this dest can be
2667 * updated. Also trigger search for the next expected (rtx-)pseudo-cumack.
2668 * Separate pseudo_cumack trackers for first transmissions and
2671 if (tp1->rec.data.TSN_seq == tp1->whoTo->pseudo_cumack) {
2672 if (tp1->rec.data.chunk_was_revoked == 0) {
2673 tp1->whoTo->new_pseudo_cumack = 1;
2675 tp1->whoTo->find_pseudo_cumack = 1;
2677 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
2678 sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK);
2680 if (tp1->rec.data.TSN_seq == tp1->whoTo->rtx_pseudo_cumack) {
2681 if (tp1->rec.data.chunk_was_revoked == 0) {
2682 tp1->whoTo->new_pseudo_cumack = 1;
2684 tp1->whoTo->find_rtx_pseudo_cumack = 1;
2686 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
2687 sctp_log_sack(*biggest_newly_acked_tsn,
2689 tp1->rec.data.TSN_seq,
2692 SCTP_LOG_TSN_ACKED);
2694 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
2695 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_GAP,
2696 tp1->whoTo->flight_size,
2698 (uintptr_t) tp1->whoTo,
2699 tp1->rec.data.TSN_seq);
2701 sctp_flight_size_decrease(tp1);
2702 if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) {
2703 (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo,
2706 sctp_total_flight_decrease(stcb, tp1);
2708 tp1->whoTo->net_ack += tp1->send_size;
2709 if (tp1->snd_count < 2) {
2711 * True non-retransmited chunk
2713 tp1->whoTo->net_ack2 += tp1->send_size;
2721 sctp_calculate_rto(stcb,
2724 &tp1->sent_rcv_time,
2725 sctp_align_safe_nocopy,
2726 SCTP_RTT_FROM_DATA);
2729 if (tp1->whoTo->rto_needed == 0) {
2730 tp1->whoTo->rto_needed = 1;
2736 if (tp1->sent <= SCTP_DATAGRAM_RESEND) {
2737 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq,
2738 stcb->asoc.this_sack_highest_gap)) {
2739 stcb->asoc.this_sack_highest_gap =
2740 tp1->rec.data.TSN_seq;
2742 if (tp1->sent == SCTP_DATAGRAM_RESEND) {
2743 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
2744 #ifdef SCTP_AUDITING_ENABLED
2745 sctp_audit_log(0xB2,
2746 (stcb->asoc.sent_queue_retran_cnt & 0x000000ff));
2751 * All chunks NOT UNSENT fall through here and are marked
2752 * (leave PR-SCTP ones that are to skip alone though)
2754 if ((tp1->sent != SCTP_FORWARD_TSN_SKIP) &&
2755 (tp1->sent != SCTP_DATAGRAM_NR_ACKED)) {
2756 tp1->sent = SCTP_DATAGRAM_MARKED;
2758 if (tp1->rec.data.chunk_was_revoked) {
2759 /* deflate the cwnd */
2760 tp1->whoTo->cwnd -= tp1->book_size;
2761 tp1->rec.data.chunk_was_revoked = 0;
2763 /* NR Sack code here */
2765 (tp1->sent != SCTP_DATAGRAM_NR_ACKED)) {
2766 if (stcb->asoc.strmout[tp1->rec.data.stream_number].chunks_on_queues > 0) {
2767 stcb->asoc.strmout[tp1->rec.data.stream_number].chunks_on_queues--;
2770 panic("No chunks on the queues for sid %u.", tp1->rec.data.stream_number);
2773 tp1->sent = SCTP_DATAGRAM_NR_ACKED;
2779 sctp_free_bufspace(stcb, &stcb->asoc, tp1, 1);
2780 sctp_m_freem(tp1->data);
2787 } /* if (tp1->TSN_seq == theTSN) */
2788 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, theTSN)) {
2791 tp1 = TAILQ_NEXT(tp1, sctp_next);
2792 if ((tp1 == NULL) && (circled == 0)) {
2794 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue);
2796 } /* end while (tp1) */
2799 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue);
2801 /* In case the fragments were not in order we must reset */
2802 } /* end for (j = fragStart */
2804 return (wake_him); /* Return value only used for nr-sack */
2809 sctp_handle_segments(struct mbuf *m, int *offset, struct sctp_tcb *stcb, struct sctp_association *asoc,
2810 uint32_t last_tsn, uint32_t * biggest_tsn_acked,
2811 uint32_t * biggest_newly_acked_tsn, uint32_t * this_sack_lowest_newack,
2812 int num_seg, int num_nr_seg, int *rto_ok)
2814 struct sctp_gap_ack_block *frag, block;
2815 struct sctp_tmit_chunk *tp1;
2820 uint16_t frag_strt, frag_end, prev_frag_end;
2822 tp1 = TAILQ_FIRST(&asoc->sent_queue);
2826 for (i = 0; i < (num_seg + num_nr_seg); i++) {
2829 tp1 = TAILQ_FIRST(&asoc->sent_queue);
2831 frag = (struct sctp_gap_ack_block *)sctp_m_getptr(m, *offset,
2832 sizeof(struct sctp_gap_ack_block), (uint8_t *) & block);
2833 *offset += sizeof(block);
2835 return (chunk_freed);
2837 frag_strt = ntohs(frag->start);
2838 frag_end = ntohs(frag->end);
2840 if (frag_strt > frag_end) {
2841 /* This gap report is malformed, skip it. */
2844 if (frag_strt <= prev_frag_end) {
2845 /* This gap report is not in order, so restart. */
2846 tp1 = TAILQ_FIRST(&asoc->sent_queue);
2848 if (SCTP_TSN_GT((last_tsn + frag_end), *biggest_tsn_acked)) {
2849 *biggest_tsn_acked = last_tsn + frag_end;
2856 if (sctp_process_segment_range(stcb, &tp1, last_tsn, frag_strt, frag_end,
2857 non_revocable, &num_frs, biggest_newly_acked_tsn,
2858 this_sack_lowest_newack, rto_ok)) {
2861 prev_frag_end = frag_end;
2863 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
2865 sctp_log_fr(*biggest_tsn_acked,
2866 *biggest_newly_acked_tsn,
2867 last_tsn, SCTP_FR_LOG_BIGGEST_TSNS);
2869 return (chunk_freed);
2873 sctp_check_for_revoked(struct sctp_tcb *stcb,
2874 struct sctp_association *asoc, uint32_t cumack,
2875 uint32_t biggest_tsn_acked)
2877 struct sctp_tmit_chunk *tp1;
2879 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
2880 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, cumack)) {
2882 * ok this guy is either ACK or MARKED. If it is
2883 * ACKED it has been previously acked but not this
2884 * time i.e. revoked. If it is MARKED it was ACK'ed
2887 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, biggest_tsn_acked)) {
2890 if (tp1->sent == SCTP_DATAGRAM_ACKED) {
2891 /* it has been revoked */
2892 tp1->sent = SCTP_DATAGRAM_SENT;
2893 tp1->rec.data.chunk_was_revoked = 1;
2895 * We must add this stuff back in to assure
2896 * timers and such get started.
2898 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
2899 sctp_misc_ints(SCTP_FLIGHT_LOG_UP_REVOKE,
2900 tp1->whoTo->flight_size,
2902 (uintptr_t) tp1->whoTo,
2903 tp1->rec.data.TSN_seq);
2905 sctp_flight_size_increase(tp1);
2906 sctp_total_flight_increase(stcb, tp1);
2908 * We inflate the cwnd to compensate for our
2909 * artificial inflation of the flight_size.
2911 tp1->whoTo->cwnd += tp1->book_size;
2912 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
2913 sctp_log_sack(asoc->last_acked_seq,
2915 tp1->rec.data.TSN_seq,
2918 SCTP_LOG_TSN_REVOKED);
2920 } else if (tp1->sent == SCTP_DATAGRAM_MARKED) {
2921 /* it has been re-acked in this SACK */
2922 tp1->sent = SCTP_DATAGRAM_ACKED;
2925 if (tp1->sent == SCTP_DATAGRAM_UNSENT)
2932 sctp_strike_gap_ack_chunks(struct sctp_tcb *stcb, struct sctp_association *asoc,
2933 uint32_t biggest_tsn_acked, uint32_t biggest_tsn_newly_acked, uint32_t this_sack_lowest_newack, int accum_moved)
2935 struct sctp_tmit_chunk *tp1;
2936 int strike_flag = 0;
2938 int tot_retrans = 0;
2939 uint32_t sending_seq;
2940 struct sctp_nets *net;
2941 int num_dests_sacked = 0;
2944 * select the sending_seq, this is either the next thing ready to be
2945 * sent but not transmitted, OR, the next seq we assign.
2947 tp1 = TAILQ_FIRST(&stcb->asoc.send_queue);
2949 sending_seq = asoc->sending_seq;
2951 sending_seq = tp1->rec.data.TSN_seq;
2954 /* CMT DAC algo: finding out if SACK is a mixed SACK */
2955 if ((asoc->sctp_cmt_on_off > 0) &&
2956 SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
2957 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
2958 if (net->saw_newack)
2962 if (stcb->asoc.peer_supports_prsctp) {
2963 (void)SCTP_GETTIME_TIMEVAL(&now);
2965 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
2967 if (tp1->no_fr_allowed) {
2968 /* this one had a timeout or something */
2971 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
2972 if (tp1->sent < SCTP_DATAGRAM_RESEND)
2973 sctp_log_fr(biggest_tsn_newly_acked,
2974 tp1->rec.data.TSN_seq,
2976 SCTP_FR_LOG_CHECK_STRIKE);
2978 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, biggest_tsn_acked) ||
2979 tp1->sent == SCTP_DATAGRAM_UNSENT) {
2983 if (stcb->asoc.peer_supports_prsctp) {
2984 if ((PR_SCTP_TTL_ENABLED(tp1->flags)) && tp1->sent < SCTP_DATAGRAM_ACKED) {
2985 /* Is it expired? */
2986 if (timevalcmp(&now, &tp1->rec.data.timetodrop, >)) {
2987 /* Yes so drop it */
2988 if (tp1->data != NULL) {
2989 (void)sctp_release_pr_sctp_chunk(stcb, tp1, 1,
2990 SCTP_SO_NOT_LOCKED);
2996 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, asoc->this_sack_highest_gap)) {
2997 /* we are beyond the tsn in the sack */
3000 if (tp1->sent >= SCTP_DATAGRAM_RESEND) {
3001 /* either a RESEND, ACKED, or MARKED */
3003 if (tp1->sent == SCTP_FORWARD_TSN_SKIP) {
3004 /* Continue strikin FWD-TSN chunks */
3005 tp1->rec.data.fwd_tsn_cnt++;
3010 * CMT : SFR algo (covers part of DAC and HTNA as well)
3012 if (tp1->whoTo && tp1->whoTo->saw_newack == 0) {
3014 * No new acks were receieved for data sent to this
3015 * dest. Therefore, according to the SFR algo for
3016 * CMT, no data sent to this dest can be marked for
3017 * FR using this SACK.
3020 } else if (tp1->whoTo && SCTP_TSN_GT(tp1->rec.data.TSN_seq,
3021 tp1->whoTo->this_sack_highest_newack)) {
3023 * CMT: New acks were receieved for data sent to
3024 * this dest. But no new acks were seen for data
3025 * sent after tp1. Therefore, according to the SFR
3026 * algo for CMT, tp1 cannot be marked for FR using
3027 * this SACK. This step covers part of the DAC algo
3028 * and the HTNA algo as well.
3033 * Here we check to see if we were have already done a FR
3034 * and if so we see if the biggest TSN we saw in the sack is
3035 * smaller than the recovery point. If so we don't strike
3036 * the tsn... otherwise we CAN strike the TSN.
3039 * @@@ JRI: Check for CMT if (accum_moved &&
3040 * asoc->fast_retran_loss_recovery && (sctp_cmt_on_off ==
3043 if (accum_moved && asoc->fast_retran_loss_recovery) {
3045 * Strike the TSN if in fast-recovery and cum-ack
3048 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
3049 sctp_log_fr(biggest_tsn_newly_acked,
3050 tp1->rec.data.TSN_seq,
3052 SCTP_FR_LOG_STRIKE_CHUNK);
3054 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3057 if ((asoc->sctp_cmt_on_off > 0) &&
3058 SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
3060 * CMT DAC algorithm: If SACK flag is set to
3061 * 0, then lowest_newack test will not pass
3062 * because it would have been set to the
3063 * cumack earlier. If not already to be
3064 * rtx'd, If not a mixed sack and if tp1 is
3065 * not between two sacked TSNs, then mark by
3066 * one more. NOTE that we are marking by one
3067 * additional time since the SACK DAC flag
3068 * indicates that two packets have been
3069 * received after this missing TSN.
3071 if ((tp1->sent < SCTP_DATAGRAM_RESEND) && (num_dests_sacked == 1) &&
3072 SCTP_TSN_GT(this_sack_lowest_newack, tp1->rec.data.TSN_seq)) {
3073 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
3074 sctp_log_fr(16 + num_dests_sacked,
3075 tp1->rec.data.TSN_seq,
3077 SCTP_FR_LOG_STRIKE_CHUNK);
3082 } else if ((tp1->rec.data.doing_fast_retransmit) &&
3083 (asoc->sctp_cmt_on_off == 0)) {
3085 * For those that have done a FR we must take
3086 * special consideration if we strike. I.e the
3087 * biggest_newly_acked must be higher than the
3088 * sending_seq at the time we did the FR.
3091 #ifdef SCTP_FR_TO_ALTERNATE
3093 * If FR's go to new networks, then we must only do
3094 * this for singly homed asoc's. However if the FR's
3095 * go to the same network (Armando's work) then its
3096 * ok to FR multiple times.
3104 if (SCTP_TSN_GE(biggest_tsn_newly_acked,
3105 tp1->rec.data.fast_retran_tsn)) {
3107 * Strike the TSN, since this ack is
3108 * beyond where things were when we
3111 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
3112 sctp_log_fr(biggest_tsn_newly_acked,
3113 tp1->rec.data.TSN_seq,
3115 SCTP_FR_LOG_STRIKE_CHUNK);
3117 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3121 if ((asoc->sctp_cmt_on_off > 0) &&
3122 SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
3124 * CMT DAC algorithm: If
3125 * SACK flag is set to 0,
3126 * then lowest_newack test
3127 * will not pass because it
3128 * would have been set to
3129 * the cumack earlier. If
3130 * not already to be rtx'd,
3131 * If not a mixed sack and
3132 * if tp1 is not between two
3133 * sacked TSNs, then mark by
3134 * one more. NOTE that we
3135 * are marking by one
3136 * additional time since the
3137 * SACK DAC flag indicates
3138 * that two packets have
3139 * been received after this
3142 if ((tp1->sent < SCTP_DATAGRAM_RESEND) &&
3143 (num_dests_sacked == 1) &&
3144 SCTP_TSN_GT(this_sack_lowest_newack,
3145 tp1->rec.data.TSN_seq)) {
3146 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
3147 sctp_log_fr(32 + num_dests_sacked,
3148 tp1->rec.data.TSN_seq,
3150 SCTP_FR_LOG_STRIKE_CHUNK);
3152 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3160 * JRI: TODO: remove code for HTNA algo. CMT's SFR
3163 } else if (SCTP_TSN_GT(tp1->rec.data.TSN_seq,
3164 biggest_tsn_newly_acked)) {
3166 * We don't strike these: This is the HTNA
3167 * algorithm i.e. we don't strike If our TSN is
3168 * larger than the Highest TSN Newly Acked.
3172 /* Strike the TSN */
3173 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
3174 sctp_log_fr(biggest_tsn_newly_acked,
3175 tp1->rec.data.TSN_seq,
3177 SCTP_FR_LOG_STRIKE_CHUNK);
3179 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3182 if ((asoc->sctp_cmt_on_off > 0) &&
3183 SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
3185 * CMT DAC algorithm: If SACK flag is set to
3186 * 0, then lowest_newack test will not pass
3187 * because it would have been set to the
3188 * cumack earlier. If not already to be
3189 * rtx'd, If not a mixed sack and if tp1 is
3190 * not between two sacked TSNs, then mark by
3191 * one more. NOTE that we are marking by one
3192 * additional time since the SACK DAC flag
3193 * indicates that two packets have been
3194 * received after this missing TSN.
3196 if ((tp1->sent < SCTP_DATAGRAM_RESEND) && (num_dests_sacked == 1) &&
3197 SCTP_TSN_GT(this_sack_lowest_newack, tp1->rec.data.TSN_seq)) {
3198 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
3199 sctp_log_fr(48 + num_dests_sacked,
3200 tp1->rec.data.TSN_seq,
3202 SCTP_FR_LOG_STRIKE_CHUNK);
3208 if (tp1->sent == SCTP_DATAGRAM_RESEND) {
3209 struct sctp_nets *alt;
3211 /* fix counts and things */
3212 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3213 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_RSND,
3214 (tp1->whoTo ? (tp1->whoTo->flight_size) : 0),
3216 (uintptr_t) tp1->whoTo,
3217 tp1->rec.data.TSN_seq);
3220 tp1->whoTo->net_ack++;
3221 sctp_flight_size_decrease(tp1);
3222 if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) {
3223 (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo,
3227 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
3228 sctp_log_rwnd(SCTP_INCREASE_PEER_RWND,
3229 asoc->peers_rwnd, tp1->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
3231 /* add back to the rwnd */
3232 asoc->peers_rwnd += (tp1->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
3234 /* remove from the total flight */
3235 sctp_total_flight_decrease(stcb, tp1);
3237 if ((stcb->asoc.peer_supports_prsctp) &&
3238 (PR_SCTP_RTX_ENABLED(tp1->flags))) {
3240 * Has it been retransmitted tv_sec times? -
3241 * we store the retran count there.
3243 if (tp1->snd_count > tp1->rec.data.timetodrop.tv_sec) {
3244 /* Yes, so drop it */
3245 if (tp1->data != NULL) {
3246 (void)sctp_release_pr_sctp_chunk(stcb, tp1, 1,
3247 SCTP_SO_NOT_LOCKED);
3249 /* Make sure to flag we had a FR */
3250 tp1->whoTo->net_ack++;
3255 * SCTP_PRINTF("OK, we are now ready to FR this
3258 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
3259 sctp_log_fr(tp1->rec.data.TSN_seq, tp1->snd_count,
3263 /* This is a subsequent FR */
3264 SCTP_STAT_INCR(sctps_sendmultfastretrans);
3266 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3267 if (asoc->sctp_cmt_on_off > 0) {
3269 * CMT: Using RTX_SSTHRESH policy for CMT.
3270 * If CMT is being used, then pick dest with
3271 * largest ssthresh for any retransmission.
3273 tp1->no_fr_allowed = 1;
3275 /* sa_ignore NO_NULL_CHK */
3276 if (asoc->sctp_cmt_pf > 0) {
3278 * JRS 5/18/07 - If CMT PF is on,
3279 * use the PF version of
3282 alt = sctp_find_alternate_net(stcb, alt, 2);
3285 * JRS 5/18/07 - If only CMT is on,
3286 * use the CMT version of
3289 /* sa_ignore NO_NULL_CHK */
3290 alt = sctp_find_alternate_net(stcb, alt, 1);
3296 * CUCv2: If a different dest is picked for
3297 * the retransmission, then new
3298 * (rtx-)pseudo_cumack needs to be tracked
3299 * for orig dest. Let CUCv2 track new (rtx-)
3300 * pseudo-cumack always.
3303 tp1->whoTo->find_pseudo_cumack = 1;
3304 tp1->whoTo->find_rtx_pseudo_cumack = 1;
3306 } else {/* CMT is OFF */
3308 #ifdef SCTP_FR_TO_ALTERNATE
3309 /* Can we find an alternate? */
3310 alt = sctp_find_alternate_net(stcb, tp1->whoTo, 0);
3313 * default behavior is to NOT retransmit
3314 * FR's to an alternate. Armando Caro's
3315 * paper details why.
3321 tp1->rec.data.doing_fast_retransmit = 1;
3323 /* mark the sending seq for possible subsequent FR's */
3325 * SCTP_PRINTF("Marking TSN for FR new value %x\n",
3326 * (uint32_t)tpi->rec.data.TSN_seq);
3328 if (TAILQ_EMPTY(&asoc->send_queue)) {
3330 * If the queue of send is empty then its
3331 * the next sequence number that will be
3332 * assigned so we subtract one from this to
3333 * get the one we last sent.
3335 tp1->rec.data.fast_retran_tsn = sending_seq;
3338 * If there are chunks on the send queue
3339 * (unsent data that has made it from the
3340 * stream queues but not out the door, we
3341 * take the first one (which will have the
3342 * lowest TSN) and subtract one to get the
3345 struct sctp_tmit_chunk *ttt;
3347 ttt = TAILQ_FIRST(&asoc->send_queue);
3348 tp1->rec.data.fast_retran_tsn =
3349 ttt->rec.data.TSN_seq;
3354 * this guy had a RTO calculation pending on
3357 if ((tp1->whoTo != NULL) &&
3358 (tp1->whoTo->rto_needed == 0)) {
3359 tp1->whoTo->rto_needed = 1;
3363 if (alt != tp1->whoTo) {
3364 /* yes, there is an alternate. */
3365 sctp_free_remote_addr(tp1->whoTo);
3366 /* sa_ignore FREED_MEMORY */
3368 atomic_add_int(&alt->ref_count, 1);
3374 struct sctp_tmit_chunk *
3375 sctp_try_advance_peer_ack_point(struct sctp_tcb *stcb,
3376 struct sctp_association *asoc)
3378 struct sctp_tmit_chunk *tp1, *tp2, *a_adv = NULL;
3382 if (asoc->peer_supports_prsctp == 0) {
3385 TAILQ_FOREACH_SAFE(tp1, &asoc->sent_queue, sctp_next, tp2) {
3386 if (tp1->sent != SCTP_FORWARD_TSN_SKIP &&
3387 tp1->sent != SCTP_DATAGRAM_RESEND &&
3388 tp1->sent != SCTP_DATAGRAM_NR_ACKED) {
3389 /* no chance to advance, out of here */
3392 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
3393 if ((tp1->sent == SCTP_FORWARD_TSN_SKIP) ||
3394 (tp1->sent == SCTP_DATAGRAM_NR_ACKED)) {
3395 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
3396 asoc->advanced_peer_ack_point,
3397 tp1->rec.data.TSN_seq, 0, 0);
3400 if (!PR_SCTP_ENABLED(tp1->flags)) {
3402 * We can't fwd-tsn past any that are reliable aka
3403 * retransmitted until the asoc fails.
3408 (void)SCTP_GETTIME_TIMEVAL(&now);
3412 * now we got a chunk which is marked for another
3413 * retransmission to a PR-stream but has run out its chances
3414 * already maybe OR has been marked to skip now. Can we skip
3415 * it if its a resend?
3417 if (tp1->sent == SCTP_DATAGRAM_RESEND &&
3418 (PR_SCTP_TTL_ENABLED(tp1->flags))) {
3420 * Now is this one marked for resend and its time is
3423 if (timevalcmp(&now, &tp1->rec.data.timetodrop, >)) {
3424 /* Yes so drop it */
3426 (void)sctp_release_pr_sctp_chunk(stcb, tp1,
3427 1, SCTP_SO_NOT_LOCKED);
3431 * No, we are done when hit one for resend
3432 * whos time as not expired.
3438 * Ok now if this chunk is marked to drop it we can clean up
3439 * the chunk, advance our peer ack point and we can check
3442 if ((tp1->sent == SCTP_FORWARD_TSN_SKIP) ||
3443 (tp1->sent == SCTP_DATAGRAM_NR_ACKED)) {
3444 /* advance PeerAckPoint goes forward */
3445 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, asoc->advanced_peer_ack_point)) {
3446 asoc->advanced_peer_ack_point = tp1->rec.data.TSN_seq;
3448 } else if (tp1->rec.data.TSN_seq == asoc->advanced_peer_ack_point) {
3449 /* No update but we do save the chk */
3454 * If it is still in RESEND we can advance no
3464 sctp_fs_audit(struct sctp_association *asoc)
3466 struct sctp_tmit_chunk *chk;
3467 int inflight = 0, resend = 0, inbetween = 0, acked = 0, above = 0;
3468 int entry_flight, entry_cnt, ret;
3470 entry_flight = asoc->total_flight;
3471 entry_cnt = asoc->total_flight_count;
3474 if (asoc->pr_sctp_cnt >= asoc->sent_queue_cnt)
3477 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
3478 if (chk->sent < SCTP_DATAGRAM_RESEND) {
3479 SCTP_PRINTF("Chk TSN:%u size:%d inflight cnt:%d\n",
3480 chk->rec.data.TSN_seq,
3484 } else if (chk->sent == SCTP_DATAGRAM_RESEND) {
3486 } else if (chk->sent < SCTP_DATAGRAM_ACKED) {
3488 } else if (chk->sent > SCTP_DATAGRAM_ACKED) {
3495 if ((inflight > 0) || (inbetween > 0)) {
3497 panic("Flight size-express incorrect? \n");
3499 SCTP_PRINTF("asoc->total_flight:%d cnt:%d\n",
3500 entry_flight, entry_cnt);
3502 SCTP_PRINTF("Flight size-express incorrect F:%d I:%d R:%d Ab:%d ACK:%d\n",
3503 inflight, inbetween, resend, above, acked);
3512 sctp_window_probe_recovery(struct sctp_tcb *stcb,
3513 struct sctp_association *asoc,
3514 struct sctp_tmit_chunk *tp1)
3516 tp1->window_probe = 0;
3517 if ((tp1->sent >= SCTP_DATAGRAM_ACKED) || (tp1->data == NULL)) {
3518 /* TSN's skipped we do NOT move back. */
3519 sctp_misc_ints(SCTP_FLIGHT_LOG_DWN_WP_FWD,
3520 tp1->whoTo->flight_size,
3522 (uintptr_t) tp1->whoTo,
3523 tp1->rec.data.TSN_seq);
3526 /* First setup this by shrinking flight */
3527 if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) {
3528 (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo,
3531 sctp_flight_size_decrease(tp1);
3532 sctp_total_flight_decrease(stcb, tp1);
3533 /* Now mark for resend */
3534 tp1->sent = SCTP_DATAGRAM_RESEND;
3535 sctp_ucount_incr(asoc->sent_queue_retran_cnt);
3537 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3538 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_WP,
3539 tp1->whoTo->flight_size,
3541 (uintptr_t) tp1->whoTo,
3542 tp1->rec.data.TSN_seq);
3547 sctp_express_handle_sack(struct sctp_tcb *stcb, uint32_t cumack,
3548 uint32_t rwnd, int *abort_now, int ecne_seen)
3550 struct sctp_nets *net;
3551 struct sctp_association *asoc;
3552 struct sctp_tmit_chunk *tp1, *tp2;
3554 int win_probe_recovery = 0;
3555 int win_probe_recovered = 0;
3556 int j, done_once = 0;
3559 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_SACK_ARRIVALS_ENABLE) {
3560 sctp_misc_ints(SCTP_SACK_LOG_EXPRESS, cumack,
3561 rwnd, stcb->asoc.last_acked_seq, stcb->asoc.peers_rwnd);
3563 SCTP_TCB_LOCK_ASSERT(stcb);
3564 #ifdef SCTP_ASOCLOG_OF_TSNS
3565 stcb->asoc.cumack_log[stcb->asoc.cumack_log_at] = cumack;
3566 stcb->asoc.cumack_log_at++;
3567 if (stcb->asoc.cumack_log_at > SCTP_TSN_LOG_SIZE) {
3568 stcb->asoc.cumack_log_at = 0;
3572 old_rwnd = asoc->peers_rwnd;
3573 if (SCTP_TSN_GT(asoc->last_acked_seq, cumack)) {
3576 } else if (asoc->last_acked_seq == cumack) {
3577 /* Window update sack */
3578 asoc->peers_rwnd = sctp_sbspace_sub(rwnd,
3579 (uint32_t) (asoc->total_flight + (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh))));
3580 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
3581 /* SWS sender side engages */
3582 asoc->peers_rwnd = 0;
3584 if (asoc->peers_rwnd > old_rwnd) {
3589 /* First setup for CC stuff */
3590 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
3591 if (SCTP_TSN_GT(cumack, net->cwr_window_tsn)) {
3592 /* Drag along the window_tsn for cwr's */
3593 net->cwr_window_tsn = cumack;
3595 net->prev_cwnd = net->cwnd;
3600 * CMT: Reset CUC and Fast recovery algo variables before
3603 net->new_pseudo_cumack = 0;
3604 net->will_exit_fast_recovery = 0;
3605 if (stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack) {
3606 (*stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack) (stcb, net);
3609 if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) {
3612 if (!TAILQ_EMPTY(&asoc->sent_queue)) {
3613 tp1 = TAILQ_LAST(&asoc->sent_queue,
3614 sctpchunk_listhead);
3615 send_s = tp1->rec.data.TSN_seq + 1;
3617 send_s = asoc->sending_seq;
3619 if (SCTP_TSN_GE(cumack, send_s)) {
3621 struct mbuf *op_err;
3622 char msg[SCTP_DIAG_INFO_LEN];
3626 panic("Impossible sack 1");
3631 snprintf(msg, sizeof(msg), "Cum ack %8.8x greater or equal then TSN %8.8x",
3633 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
3634 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_25;
3635 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
3640 asoc->this_sack_highest_gap = cumack;
3641 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
3642 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
3643 stcb->asoc.overall_error_count,
3645 SCTP_FROM_SCTP_INDATA,
3648 stcb->asoc.overall_error_count = 0;
3649 if (SCTP_TSN_GT(cumack, asoc->last_acked_seq)) {
3650 /* process the new consecutive TSN first */
3651 TAILQ_FOREACH_SAFE(tp1, &asoc->sent_queue, sctp_next, tp2) {
3652 if (SCTP_TSN_GE(cumack, tp1->rec.data.TSN_seq)) {
3653 if (tp1->sent == SCTP_DATAGRAM_UNSENT) {
3654 SCTP_PRINTF("Warning, an unsent is now acked?\n");
3656 if (tp1->sent < SCTP_DATAGRAM_ACKED) {
3658 * If it is less than ACKED, it is
3659 * now no-longer in flight. Higher
3660 * values may occur during marking
3662 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3663 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3664 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_CA,
3665 tp1->whoTo->flight_size,
3667 (uintptr_t) tp1->whoTo,
3668 tp1->rec.data.TSN_seq);
3670 sctp_flight_size_decrease(tp1);
3671 if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) {
3672 (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo,
3675 /* sa_ignore NO_NULL_CHK */
3676 sctp_total_flight_decrease(stcb, tp1);
3678 tp1->whoTo->net_ack += tp1->send_size;
3679 if (tp1->snd_count < 2) {
3681 * True non-retransmited
3684 tp1->whoTo->net_ack2 +=
3687 /* update RTO too? */
3696 sctp_calculate_rto(stcb,
3698 &tp1->sent_rcv_time,
3699 sctp_align_safe_nocopy,
3700 SCTP_RTT_FROM_DATA);
3703 if (tp1->whoTo->rto_needed == 0) {
3704 tp1->whoTo->rto_needed = 1;
3710 * CMT: CUCv2 algorithm. From the
3711 * cumack'd TSNs, for each TSN being
3712 * acked for the first time, set the
3713 * following variables for the
3714 * corresp destination.
3715 * new_pseudo_cumack will trigger a
3717 * find_(rtx_)pseudo_cumack will
3718 * trigger search for the next
3719 * expected (rtx-)pseudo-cumack.
3721 tp1->whoTo->new_pseudo_cumack = 1;
3722 tp1->whoTo->find_pseudo_cumack = 1;
3723 tp1->whoTo->find_rtx_pseudo_cumack = 1;
3725 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
3726 /* sa_ignore NO_NULL_CHK */
3727 sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK);
3730 if (tp1->sent == SCTP_DATAGRAM_RESEND) {
3731 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
3733 if (tp1->rec.data.chunk_was_revoked) {
3734 /* deflate the cwnd */
3735 tp1->whoTo->cwnd -= tp1->book_size;
3736 tp1->rec.data.chunk_was_revoked = 0;
3738 if (tp1->sent != SCTP_DATAGRAM_NR_ACKED) {
3739 if (asoc->strmout[tp1->rec.data.stream_number].chunks_on_queues > 0) {
3740 asoc->strmout[tp1->rec.data.stream_number].chunks_on_queues--;
3743 panic("No chunks on the queues for sid %u.", tp1->rec.data.stream_number);
3747 TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next);
3749 /* sa_ignore NO_NULL_CHK */
3750 sctp_free_bufspace(stcb, asoc, tp1, 1);
3751 sctp_m_freem(tp1->data);
3754 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
3755 sctp_log_sack(asoc->last_acked_seq,
3757 tp1->rec.data.TSN_seq,
3760 SCTP_LOG_FREE_SENT);
3762 asoc->sent_queue_cnt--;
3763 sctp_free_a_chunk(stcb, tp1, SCTP_SO_NOT_LOCKED);
3770 /* sa_ignore NO_NULL_CHK */
3771 if (stcb->sctp_socket) {
3772 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3776 SOCKBUF_LOCK(&stcb->sctp_socket->so_snd);
3777 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) {
3778 /* sa_ignore NO_NULL_CHK */
3779 sctp_wakeup_log(stcb, 1, SCTP_WAKESND_FROM_SACK);
3781 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3782 so = SCTP_INP_SO(stcb->sctp_ep);
3783 atomic_add_int(&stcb->asoc.refcnt, 1);
3784 SCTP_TCB_UNLOCK(stcb);
3785 SCTP_SOCKET_LOCK(so, 1);
3786 SCTP_TCB_LOCK(stcb);
3787 atomic_subtract_int(&stcb->asoc.refcnt, 1);
3788 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
3789 /* assoc was freed while we were unlocked */
3790 SCTP_SOCKET_UNLOCK(so, 1);
3794 sctp_sowwakeup_locked(stcb->sctp_ep, stcb->sctp_socket);
3795 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3796 SCTP_SOCKET_UNLOCK(so, 1);
3799 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) {
3800 sctp_wakeup_log(stcb, 1, SCTP_NOWAKE_FROM_SACK);
3804 /* JRS - Use the congestion control given in the CC module */
3805 if ((asoc->last_acked_seq != cumack) && (ecne_seen == 0)) {
3806 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
3807 if (net->net_ack2 > 0) {
3809 * Karn's rule applies to clearing error
3810 * count, this is optional.
3812 net->error_count = 0;
3813 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
3814 /* addr came good */
3815 net->dest_state |= SCTP_ADDR_REACHABLE;
3816 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
3817 0, (void *)net, SCTP_SO_NOT_LOCKED);
3819 if (net == stcb->asoc.primary_destination) {
3820 if (stcb->asoc.alternate) {
3822 * release the alternate,
3825 sctp_free_remote_addr(stcb->asoc.alternate);
3826 stcb->asoc.alternate = NULL;
3829 if (net->dest_state & SCTP_ADDR_PF) {
3830 net->dest_state &= ~SCTP_ADDR_PF;
3831 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
3832 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
3833 asoc->cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
3834 /* Done with this net */
3837 /* restore any doubled timers */
3838 net->RTO = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv;
3839 if (net->RTO < stcb->asoc.minrto) {
3840 net->RTO = stcb->asoc.minrto;
3842 if (net->RTO > stcb->asoc.maxrto) {
3843 net->RTO = stcb->asoc.maxrto;
3847 asoc->cc_functions.sctp_cwnd_update_after_sack(stcb, asoc, 1, 0, 0);
3849 asoc->last_acked_seq = cumack;
3851 if (TAILQ_EMPTY(&asoc->sent_queue)) {
3852 /* nothing left in-flight */
3853 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
3854 net->flight_size = 0;
3855 net->partial_bytes_acked = 0;
3857 asoc->total_flight = 0;
3858 asoc->total_flight_count = 0;
3861 asoc->peers_rwnd = sctp_sbspace_sub(rwnd,
3862 (uint32_t) (asoc->total_flight + (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh))));
3863 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
3864 /* SWS sender side engages */
3865 asoc->peers_rwnd = 0;
3867 if (asoc->peers_rwnd > old_rwnd) {
3868 win_probe_recovery = 1;
3870 /* Now assure a timer where data is queued at */
3873 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
3876 if (win_probe_recovery && (net->window_probe)) {
3877 win_probe_recovered = 1;
3879 * Find first chunk that was used with window probe
3880 * and clear the sent
3882 /* sa_ignore FREED_MEMORY */
3883 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
3884 if (tp1->window_probe) {
3885 /* move back to data send queue */
3886 sctp_window_probe_recovery(stcb, asoc, tp1);
3891 if (net->RTO == 0) {
3892 to_ticks = MSEC_TO_TICKS(stcb->asoc.initial_rto);
3894 to_ticks = MSEC_TO_TICKS(net->RTO);
3896 if (net->flight_size) {
3898 (void)SCTP_OS_TIMER_START(&net->rxt_timer.timer, to_ticks,
3899 sctp_timeout_handler, &net->rxt_timer);
3900 if (net->window_probe) {
3901 net->window_probe = 0;
3904 if (net->window_probe) {
3906 * In window probes we must assure a timer
3907 * is still running there
3909 net->window_probe = 0;
3910 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
3911 SCTP_OS_TIMER_START(&net->rxt_timer.timer, to_ticks,
3912 sctp_timeout_handler, &net->rxt_timer);
3914 } else if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
3915 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3917 SCTP_FROM_SCTP_INDATA + SCTP_LOC_22);
3922 (!TAILQ_EMPTY(&asoc->sent_queue)) &&
3923 (asoc->sent_queue_retran_cnt == 0) &&
3924 (win_probe_recovered == 0) &&
3927 * huh, this should not happen unless all packets are
3928 * PR-SCTP and marked to skip of course.
3930 if (sctp_fs_audit(asoc)) {
3931 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
3932 net->flight_size = 0;
3934 asoc->total_flight = 0;
3935 asoc->total_flight_count = 0;
3936 asoc->sent_queue_retran_cnt = 0;
3937 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
3938 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3939 sctp_flight_size_increase(tp1);
3940 sctp_total_flight_increase(stcb, tp1);
3941 } else if (tp1->sent == SCTP_DATAGRAM_RESEND) {
3942 sctp_ucount_incr(asoc->sent_queue_retran_cnt);
3949 /**********************************/
3950 /* Now what about shutdown issues */
3951 /**********************************/
3952 if (TAILQ_EMPTY(&asoc->send_queue) && TAILQ_EMPTY(&asoc->sent_queue)) {
3953 /* nothing left on sendqueue.. consider done */
3955 if ((asoc->stream_queue_cnt == 1) &&
3956 ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
3957 (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED)) &&
3958 (asoc->locked_on_sending)
3960 struct sctp_stream_queue_pending *sp;
3963 * I may be in a state where we got all across.. but
3964 * cannot write more due to a shutdown... we abort
3965 * since the user did not indicate EOR in this case.
3966 * The sp will be cleaned during free of the asoc.
3968 sp = TAILQ_LAST(&((asoc->locked_on_sending)->outqueue),
3970 if ((sp) && (sp->length == 0)) {
3971 /* Let cleanup code purge it */
3972 if (sp->msg_is_complete) {
3973 asoc->stream_queue_cnt--;
3975 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
3976 asoc->locked_on_sending = NULL;
3977 asoc->stream_queue_cnt--;
3981 if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) &&
3982 (asoc->stream_queue_cnt == 0)) {
3983 if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) {
3984 /* Need to abort here */
3985 struct mbuf *op_err;
3990 op_err = sctp_generate_cause(SCTP_CAUSE_USER_INITIATED_ABT, "");
3991 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_24;
3992 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
3994 struct sctp_nets *netp;
3996 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
3997 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
3998 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
4000 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
4001 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
4002 sctp_stop_timers_for_shutdown(stcb);
4003 if (asoc->alternate) {
4004 netp = asoc->alternate;
4006 netp = asoc->primary_destination;
4008 sctp_send_shutdown(stcb, netp);
4009 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
4010 stcb->sctp_ep, stcb, netp);
4011 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
4012 stcb->sctp_ep, stcb, netp);
4014 } else if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) &&
4015 (asoc->stream_queue_cnt == 0)) {
4016 struct sctp_nets *netp;
4018 if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) {
4021 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
4022 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
4023 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
4024 sctp_stop_timers_for_shutdown(stcb);
4025 if (asoc->alternate) {
4026 netp = asoc->alternate;
4028 netp = asoc->primary_destination;
4030 sctp_send_shutdown_ack(stcb, netp);
4031 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
4032 stcb->sctp_ep, stcb, netp);
4035 /*********************************************/
4036 /* Here we perform PR-SCTP procedures */
4038 /*********************************************/
4039 /* C1. update advancedPeerAckPoint */
4040 if (SCTP_TSN_GT(cumack, asoc->advanced_peer_ack_point)) {
4041 asoc->advanced_peer_ack_point = cumack;
4043 /* PR-Sctp issues need to be addressed too */
4044 if ((asoc->peer_supports_prsctp) && (asoc->pr_sctp_cnt > 0)) {
4045 struct sctp_tmit_chunk *lchk;
4046 uint32_t old_adv_peer_ack_point;
4048 old_adv_peer_ack_point = asoc->advanced_peer_ack_point;
4049 lchk = sctp_try_advance_peer_ack_point(stcb, asoc);
4050 /* C3. See if we need to send a Fwd-TSN */
4051 if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, cumack)) {
4053 * ISSUE with ECN, see FWD-TSN processing.
4055 if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, old_adv_peer_ack_point)) {
4056 send_forward_tsn(stcb, asoc);
4058 /* try to FR fwd-tsn's that get lost too */
4059 if (lchk->rec.data.fwd_tsn_cnt >= 3) {
4060 send_forward_tsn(stcb, asoc);
4065 /* Assure a timer is up */
4066 sctp_timer_start(SCTP_TIMER_TYPE_SEND,
4067 stcb->sctp_ep, stcb, lchk->whoTo);
4070 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_RWND_LOGGING_ENABLE) {
4071 sctp_misc_ints(SCTP_SACK_RWND_UPDATE,
4073 stcb->asoc.peers_rwnd,
4074 stcb->asoc.total_flight,
4075 stcb->asoc.total_output_queue_size);
4080 sctp_handle_sack(struct mbuf *m, int offset_seg, int offset_dup,
4081 struct sctp_tcb *stcb,
4082 uint16_t num_seg, uint16_t num_nr_seg, uint16_t num_dup,
4083 int *abort_now, uint8_t flags,
4084 uint32_t cum_ack, uint32_t rwnd, int ecne_seen)
4086 struct sctp_association *asoc;
4087 struct sctp_tmit_chunk *tp1, *tp2;
4088 uint32_t last_tsn, biggest_tsn_acked, biggest_tsn_newly_acked, this_sack_lowest_newack;
4089 uint16_t wake_him = 0;
4090 uint32_t send_s = 0;
4092 int accum_moved = 0;
4093 int will_exit_fast_recovery = 0;
4094 uint32_t a_rwnd, old_rwnd;
4095 int win_probe_recovery = 0;
4096 int win_probe_recovered = 0;
4097 struct sctp_nets *net = NULL;
4100 uint8_t reneged_all = 0;
4101 uint8_t cmt_dac_flag;
4104 * we take any chance we can to service our queues since we cannot
4105 * get awoken when the socket is read from :<
4108 * Now perform the actual SACK handling: 1) Verify that it is not an
4109 * old sack, if so discard. 2) If there is nothing left in the send
4110 * queue (cum-ack is equal to last acked) then you have a duplicate
4111 * too, update any rwnd change and verify no timers are running.
4112 * then return. 3) Process any new consequtive data i.e. cum-ack
4113 * moved process these first and note that it moved. 4) Process any
4114 * sack blocks. 5) Drop any acked from the queue. 6) Check for any
4115 * revoked blocks and mark. 7) Update the cwnd. 8) Nothing left,
4116 * sync up flightsizes and things, stop all timers and also check
4117 * for shutdown_pending state. If so then go ahead and send off the
4118 * shutdown. If in shutdown recv, send off the shutdown-ack and
4119 * start that timer, Ret. 9) Strike any non-acked things and do FR
4120 * procedure if needed being sure to set the FR flag. 10) Do pr-sctp
4121 * procedures. 11) Apply any FR penalties. 12) Assure we will SACK
4122 * if in shutdown_recv state.
4124 SCTP_TCB_LOCK_ASSERT(stcb);
4126 this_sack_lowest_newack = 0;
4127 SCTP_STAT_INCR(sctps_slowpath_sack);
4129 cmt_dac_flag = flags & SCTP_SACK_CMT_DAC;
4130 #ifdef SCTP_ASOCLOG_OF_TSNS
4131 stcb->asoc.cumack_log[stcb->asoc.cumack_log_at] = cum_ack;
4132 stcb->asoc.cumack_log_at++;
4133 if (stcb->asoc.cumack_log_at > SCTP_TSN_LOG_SIZE) {
4134 stcb->asoc.cumack_log_at = 0;
4139 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_SACK_ARRIVALS_ENABLE) {
4140 sctp_misc_ints(SCTP_SACK_LOG_NORMAL, cum_ack,
4141 rwnd, stcb->asoc.last_acked_seq, stcb->asoc.peers_rwnd);
4143 old_rwnd = stcb->asoc.peers_rwnd;
4144 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4145 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4146 stcb->asoc.overall_error_count,
4148 SCTP_FROM_SCTP_INDATA,
4151 stcb->asoc.overall_error_count = 0;
4153 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
4154 sctp_log_sack(asoc->last_acked_seq,
4161 if ((num_dup) && (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE)) {
4163 uint32_t *dupdata, dblock;
4165 for (i = 0; i < num_dup; i++) {
4166 dupdata = (uint32_t *) sctp_m_getptr(m, offset_dup + i * sizeof(uint32_t),
4167 sizeof(uint32_t), (uint8_t *) & dblock);
4168 if (dupdata == NULL) {
4171 sctp_log_fr(*dupdata, 0, 0, SCTP_FR_DUPED);
4174 if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) {
4176 if (!TAILQ_EMPTY(&asoc->sent_queue)) {
4177 tp1 = TAILQ_LAST(&asoc->sent_queue,
4178 sctpchunk_listhead);
4179 send_s = tp1->rec.data.TSN_seq + 1;
4182 send_s = asoc->sending_seq;
4184 if (SCTP_TSN_GE(cum_ack, send_s)) {
4185 struct mbuf *op_err;
4186 char msg[SCTP_DIAG_INFO_LEN];
4189 * no way, we have not even sent this TSN out yet.
4190 * Peer is hopelessly messed up with us.
4192 SCTP_PRINTF("NEW cum_ack:%x send_s:%x is smaller or equal\n",
4195 SCTP_PRINTF("Got send_s from tsn:%x + 1 of tp1:%p\n",
4196 tp1->rec.data.TSN_seq, (void *)tp1);
4201 snprintf(msg, sizeof(msg), "Cum ack %8.8x greater or equal then TSN %8.8x",
4203 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
4204 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_25;
4205 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
4209 /**********************/
4210 /* 1) check the range */
4211 /**********************/
4212 if (SCTP_TSN_GT(asoc->last_acked_seq, last_tsn)) {
4213 /* acking something behind */
4216 /* update the Rwnd of the peer */
4217 if (TAILQ_EMPTY(&asoc->sent_queue) &&
4218 TAILQ_EMPTY(&asoc->send_queue) &&
4219 (asoc->stream_queue_cnt == 0)) {
4220 /* nothing left on send/sent and strmq */
4221 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
4222 sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK,
4223 asoc->peers_rwnd, 0, 0, a_rwnd);
4225 asoc->peers_rwnd = a_rwnd;
4226 if (asoc->sent_queue_retran_cnt) {
4227 asoc->sent_queue_retran_cnt = 0;
4229 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4230 /* SWS sender side engages */
4231 asoc->peers_rwnd = 0;
4233 /* stop any timers */
4234 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4235 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
4236 stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_26);
4237 net->partial_bytes_acked = 0;
4238 net->flight_size = 0;
4240 asoc->total_flight = 0;
4241 asoc->total_flight_count = 0;
4245 * We init netAckSz and netAckSz2 to 0. These are used to track 2
4246 * things. The total byte count acked is tracked in netAckSz AND
4247 * netAck2 is used to track the total bytes acked that are un-
4248 * amibguious and were never retransmitted. We track these on a per
4249 * destination address basis.
4251 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4252 if (SCTP_TSN_GT(cum_ack, net->cwr_window_tsn)) {
4253 /* Drag along the window_tsn for cwr's */
4254 net->cwr_window_tsn = cum_ack;
4256 net->prev_cwnd = net->cwnd;
4261 * CMT: Reset CUC and Fast recovery algo variables before
4264 net->new_pseudo_cumack = 0;
4265 net->will_exit_fast_recovery = 0;
4266 if (stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack) {
4267 (*stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack) (stcb, net);
4270 /* process the new consecutive TSN first */
4271 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
4272 if (SCTP_TSN_GE(last_tsn, tp1->rec.data.TSN_seq)) {
4273 if (tp1->sent != SCTP_DATAGRAM_UNSENT) {
4275 if (tp1->sent < SCTP_DATAGRAM_ACKED) {
4277 * If it is less than ACKED, it is
4278 * now no-longer in flight. Higher
4279 * values may occur during marking
4281 if ((tp1->whoTo->dest_state &
4282 SCTP_ADDR_UNCONFIRMED) &&
4283 (tp1->snd_count < 2)) {
4285 * If there was no retran
4286 * and the address is
4287 * un-confirmed and we sent
4289 * sacked.. its confirmed,
4292 tp1->whoTo->dest_state &=
4293 ~SCTP_ADDR_UNCONFIRMED;
4295 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
4296 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
4297 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_CA,
4298 tp1->whoTo->flight_size,
4300 (uintptr_t) tp1->whoTo,
4301 tp1->rec.data.TSN_seq);
4303 sctp_flight_size_decrease(tp1);
4304 sctp_total_flight_decrease(stcb, tp1);
4305 if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) {
4306 (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo,
4310 tp1->whoTo->net_ack += tp1->send_size;
4312 /* CMT SFR and DAC algos */
4313 this_sack_lowest_newack = tp1->rec.data.TSN_seq;
4314 tp1->whoTo->saw_newack = 1;
4316 if (tp1->snd_count < 2) {
4318 * True non-retransmited
4321 tp1->whoTo->net_ack2 +=
4324 /* update RTO too? */
4328 sctp_calculate_rto(stcb,
4330 &tp1->sent_rcv_time,
4331 sctp_align_safe_nocopy,
4332 SCTP_RTT_FROM_DATA);
4335 if (tp1->whoTo->rto_needed == 0) {
4336 tp1->whoTo->rto_needed = 1;
4342 * CMT: CUCv2 algorithm. From the
4343 * cumack'd TSNs, for each TSN being
4344 * acked for the first time, set the
4345 * following variables for the
4346 * corresp destination.
4347 * new_pseudo_cumack will trigger a
4349 * find_(rtx_)pseudo_cumack will
4350 * trigger search for the next
4351 * expected (rtx-)pseudo-cumack.
4353 tp1->whoTo->new_pseudo_cumack = 1;
4354 tp1->whoTo->find_pseudo_cumack = 1;
4355 tp1->whoTo->find_rtx_pseudo_cumack = 1;
4358 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
4359 sctp_log_sack(asoc->last_acked_seq,
4361 tp1->rec.data.TSN_seq,
4364 SCTP_LOG_TSN_ACKED);
4366 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
4367 sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK);
4370 if (tp1->sent == SCTP_DATAGRAM_RESEND) {
4371 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
4372 #ifdef SCTP_AUDITING_ENABLED
4373 sctp_audit_log(0xB3,
4374 (asoc->sent_queue_retran_cnt & 0x000000ff));
4377 if (tp1->rec.data.chunk_was_revoked) {
4378 /* deflate the cwnd */
4379 tp1->whoTo->cwnd -= tp1->book_size;
4380 tp1->rec.data.chunk_was_revoked = 0;
4382 if (tp1->sent != SCTP_DATAGRAM_NR_ACKED) {
4383 tp1->sent = SCTP_DATAGRAM_ACKED;
4390 biggest_tsn_newly_acked = biggest_tsn_acked = last_tsn;
4391 /* always set this up to cum-ack */
4392 asoc->this_sack_highest_gap = last_tsn;
4394 if ((num_seg > 0) || (num_nr_seg > 0)) {
4397 * CMT: SFR algo (and HTNA) - this_sack_highest_newack has
4398 * to be greater than the cumack. Also reset saw_newack to 0
4401 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4402 net->saw_newack = 0;
4403 net->this_sack_highest_newack = last_tsn;
4407 * thisSackHighestGap will increase while handling NEW
4408 * segments this_sack_highest_newack will increase while
4409 * handling NEWLY ACKED chunks. this_sack_lowest_newack is
4410 * used for CMT DAC algo. saw_newack will also change.
4412 if (sctp_handle_segments(m, &offset_seg, stcb, asoc, last_tsn, &biggest_tsn_acked,
4413 &biggest_tsn_newly_acked, &this_sack_lowest_newack,
4414 num_seg, num_nr_seg, &rto_ok)) {
4417 if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) {
4419 * validate the biggest_tsn_acked in the gap acks if
4420 * strict adherence is wanted.
4422 if (SCTP_TSN_GE(biggest_tsn_acked, send_s)) {
4424 * peer is either confused or we are under
4425 * attack. We must abort.
4427 SCTP_PRINTF("Hopeless peer! biggest_tsn_acked:%x largest seq:%x\n",
4428 biggest_tsn_acked, send_s);
4433 /*******************************************/
4434 /* cancel ALL T3-send timer if accum moved */
4435 /*******************************************/
4436 if (asoc->sctp_cmt_on_off > 0) {
4437 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4438 if (net->new_pseudo_cumack)
4439 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
4441 SCTP_FROM_SCTP_INDATA + SCTP_LOC_27);
4446 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4447 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
4448 stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_28);
4452 /********************************************/
4453 /* drop the acked chunks from the sentqueue */
4454 /********************************************/
4455 asoc->last_acked_seq = cum_ack;
4457 TAILQ_FOREACH_SAFE(tp1, &asoc->sent_queue, sctp_next, tp2) {
4458 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, cum_ack)) {
4461 if (tp1->sent != SCTP_DATAGRAM_NR_ACKED) {
4462 if (asoc->strmout[tp1->rec.data.stream_number].chunks_on_queues > 0) {
4463 asoc->strmout[tp1->rec.data.stream_number].chunks_on_queues--;
4466 panic("No chunks on the queues for sid %u.", tp1->rec.data.stream_number);
4470 TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next);
4471 if (PR_SCTP_ENABLED(tp1->flags)) {
4472 if (asoc->pr_sctp_cnt != 0)
4473 asoc->pr_sctp_cnt--;
4475 asoc->sent_queue_cnt--;
4477 /* sa_ignore NO_NULL_CHK */
4478 sctp_free_bufspace(stcb, asoc, tp1, 1);
4479 sctp_m_freem(tp1->data);
4481 if (asoc->peer_supports_prsctp && PR_SCTP_BUF_ENABLED(tp1->flags)) {
4482 asoc->sent_queue_cnt_removeable--;
4485 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
4486 sctp_log_sack(asoc->last_acked_seq,
4488 tp1->rec.data.TSN_seq,
4491 SCTP_LOG_FREE_SENT);
4493 sctp_free_a_chunk(stcb, tp1, SCTP_SO_NOT_LOCKED);
4496 if (TAILQ_EMPTY(&asoc->sent_queue) && (asoc->total_flight > 0)) {
4498 panic("Warning flight size is postive and should be 0");
4500 SCTP_PRINTF("Warning flight size incorrect should be 0 is %d\n",
4501 asoc->total_flight);
4503 asoc->total_flight = 0;
4505 /* sa_ignore NO_NULL_CHK */
4506 if ((wake_him) && (stcb->sctp_socket)) {
4507 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4511 SOCKBUF_LOCK(&stcb->sctp_socket->so_snd);
4512 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) {
4513 sctp_wakeup_log(stcb, wake_him, SCTP_WAKESND_FROM_SACK);
4515 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4516 so = SCTP_INP_SO(stcb->sctp_ep);
4517 atomic_add_int(&stcb->asoc.refcnt, 1);
4518 SCTP_TCB_UNLOCK(stcb);
4519 SCTP_SOCKET_LOCK(so, 1);
4520 SCTP_TCB_LOCK(stcb);
4521 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4522 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
4523 /* assoc was freed while we were unlocked */
4524 SCTP_SOCKET_UNLOCK(so, 1);
4528 sctp_sowwakeup_locked(stcb->sctp_ep, stcb->sctp_socket);
4529 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4530 SCTP_SOCKET_UNLOCK(so, 1);
4533 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) {
4534 sctp_wakeup_log(stcb, wake_him, SCTP_NOWAKE_FROM_SACK);
4538 if (asoc->fast_retran_loss_recovery && accum_moved) {
4539 if (SCTP_TSN_GE(asoc->last_acked_seq, asoc->fast_recovery_tsn)) {
4540 /* Setup so we will exit RFC2582 fast recovery */
4541 will_exit_fast_recovery = 1;
4545 * Check for revoked fragments:
4547 * if Previous sack - Had no frags then we can't have any revoked if
4548 * Previous sack - Had frag's then - If we now have frags aka
4549 * num_seg > 0 call sctp_check_for_revoked() to tell if peer revoked
4550 * some of them. else - The peer revoked all ACKED fragments, since
4551 * we had some before and now we have NONE.
4555 sctp_check_for_revoked(stcb, asoc, cum_ack, biggest_tsn_acked);
4556 asoc->saw_sack_with_frags = 1;
4557 } else if (asoc->saw_sack_with_frags) {
4558 int cnt_revoked = 0;
4560 /* Peer revoked all dg's marked or acked */
4561 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
4562 if (tp1->sent == SCTP_DATAGRAM_ACKED) {
4563 tp1->sent = SCTP_DATAGRAM_SENT;
4564 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
4565 sctp_misc_ints(SCTP_FLIGHT_LOG_UP_REVOKE,
4566 tp1->whoTo->flight_size,
4568 (uintptr_t) tp1->whoTo,
4569 tp1->rec.data.TSN_seq);
4571 sctp_flight_size_increase(tp1);
4572 sctp_total_flight_increase(stcb, tp1);
4573 tp1->rec.data.chunk_was_revoked = 1;
4575 * To ensure that this increase in
4576 * flightsize, which is artificial, does not
4577 * throttle the sender, we also increase the
4578 * cwnd artificially.
4580 tp1->whoTo->cwnd += tp1->book_size;
4587 asoc->saw_sack_with_frags = 0;
4590 asoc->saw_sack_with_nr_frags = 1;
4592 asoc->saw_sack_with_nr_frags = 0;
4594 /* JRS - Use the congestion control given in the CC module */
4595 if (ecne_seen == 0) {
4596 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4597 if (net->net_ack2 > 0) {
4599 * Karn's rule applies to clearing error
4600 * count, this is optional.
4602 net->error_count = 0;
4603 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
4604 /* addr came good */
4605 net->dest_state |= SCTP_ADDR_REACHABLE;
4606 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
4607 0, (void *)net, SCTP_SO_NOT_LOCKED);
4609 if (net == stcb->asoc.primary_destination) {
4610 if (stcb->asoc.alternate) {
4612 * release the alternate,
4615 sctp_free_remote_addr(stcb->asoc.alternate);
4616 stcb->asoc.alternate = NULL;
4619 if (net->dest_state & SCTP_ADDR_PF) {
4620 net->dest_state &= ~SCTP_ADDR_PF;
4621 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
4622 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
4623 asoc->cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
4624 /* Done with this net */
4627 /* restore any doubled timers */
4628 net->RTO = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv;
4629 if (net->RTO < stcb->asoc.minrto) {
4630 net->RTO = stcb->asoc.minrto;
4632 if (net->RTO > stcb->asoc.maxrto) {
4633 net->RTO = stcb->asoc.maxrto;
4637 asoc->cc_functions.sctp_cwnd_update_after_sack(stcb, asoc, accum_moved, reneged_all, will_exit_fast_recovery);
4639 if (TAILQ_EMPTY(&asoc->sent_queue)) {
4640 /* nothing left in-flight */
4641 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4642 /* stop all timers */
4643 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
4644 stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_30);
4645 net->flight_size = 0;
4646 net->partial_bytes_acked = 0;
4648 asoc->total_flight = 0;
4649 asoc->total_flight_count = 0;
4651 /**********************************/
4652 /* Now what about shutdown issues */
4653 /**********************************/
4654 if (TAILQ_EMPTY(&asoc->send_queue) && TAILQ_EMPTY(&asoc->sent_queue)) {
4655 /* nothing left on sendqueue.. consider done */
4656 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
4657 sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK,
4658 asoc->peers_rwnd, 0, 0, a_rwnd);
4660 asoc->peers_rwnd = a_rwnd;
4661 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4662 /* SWS sender side engages */
4663 asoc->peers_rwnd = 0;
4666 if ((asoc->stream_queue_cnt == 1) &&
4667 ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
4668 (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED)) &&
4669 (asoc->locked_on_sending)
4671 struct sctp_stream_queue_pending *sp;
4674 * I may be in a state where we got all across.. but
4675 * cannot write more due to a shutdown... we abort
4676 * since the user did not indicate EOR in this case.
4678 sp = TAILQ_LAST(&((asoc->locked_on_sending)->outqueue),
4680 if ((sp) && (sp->length == 0)) {
4681 asoc->locked_on_sending = NULL;
4682 if (sp->msg_is_complete) {
4683 asoc->stream_queue_cnt--;
4685 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
4686 asoc->stream_queue_cnt--;
4690 if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) &&
4691 (asoc->stream_queue_cnt == 0)) {
4692 if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) {
4693 /* Need to abort here */
4694 struct mbuf *op_err;
4699 op_err = sctp_generate_cause(SCTP_CAUSE_USER_INITIATED_ABT, "");
4700 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_31;
4701 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
4704 struct sctp_nets *netp;
4706 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
4707 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
4708 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
4710 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
4711 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
4712 sctp_stop_timers_for_shutdown(stcb);
4713 if (asoc->alternate) {
4714 netp = asoc->alternate;
4716 netp = asoc->primary_destination;
4718 sctp_send_shutdown(stcb, netp);
4719 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
4720 stcb->sctp_ep, stcb, netp);
4721 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
4722 stcb->sctp_ep, stcb, netp);
4725 } else if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) &&
4726 (asoc->stream_queue_cnt == 0)) {
4727 struct sctp_nets *netp;
4729 if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) {
4732 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
4733 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
4734 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
4735 sctp_stop_timers_for_shutdown(stcb);
4736 if (asoc->alternate) {
4737 netp = asoc->alternate;
4739 netp = asoc->primary_destination;
4741 sctp_send_shutdown_ack(stcb, netp);
4742 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
4743 stcb->sctp_ep, stcb, netp);
4748 * Now here we are going to recycle net_ack for a different use...
4751 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4756 * CMT DAC algorithm: If SACK DAC flag was 0, then no extra marking
4757 * to be done. Setting this_sack_lowest_newack to the cum_ack will
4758 * automatically ensure that.
4760 if ((asoc->sctp_cmt_on_off > 0) &&
4761 SCTP_BASE_SYSCTL(sctp_cmt_use_dac) &&
4762 (cmt_dac_flag == 0)) {
4763 this_sack_lowest_newack = cum_ack;
4765 if ((num_seg > 0) || (num_nr_seg > 0)) {
4766 sctp_strike_gap_ack_chunks(stcb, asoc, biggest_tsn_acked,
4767 biggest_tsn_newly_acked, this_sack_lowest_newack, accum_moved);
4769 /* JRS - Use the congestion control given in the CC module */
4770 asoc->cc_functions.sctp_cwnd_update_after_fr(stcb, asoc);
4772 /* Now are we exiting loss recovery ? */
4773 if (will_exit_fast_recovery) {
4774 /* Ok, we must exit fast recovery */
4775 asoc->fast_retran_loss_recovery = 0;
4777 if ((asoc->sat_t3_loss_recovery) &&
4778 SCTP_TSN_GE(asoc->last_acked_seq, asoc->sat_t3_recovery_tsn)) {
4779 /* end satellite t3 loss recovery */
4780 asoc->sat_t3_loss_recovery = 0;
4785 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4786 if (net->will_exit_fast_recovery) {
4787 /* Ok, we must exit fast recovery */
4788 net->fast_retran_loss_recovery = 0;
4792 /* Adjust and set the new rwnd value */
4793 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
4794 sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK,
4795 asoc->peers_rwnd, asoc->total_flight, (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)), a_rwnd);
4797 asoc->peers_rwnd = sctp_sbspace_sub(a_rwnd,
4798 (uint32_t) (asoc->total_flight + (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh))));
4799 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4800 /* SWS sender side engages */
4801 asoc->peers_rwnd = 0;
4803 if (asoc->peers_rwnd > old_rwnd) {
4804 win_probe_recovery = 1;
4807 * Now we must setup so we have a timer up for anyone with
4813 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4814 if (win_probe_recovery && (net->window_probe)) {
4815 win_probe_recovered = 1;
4817 * Find first chunk that was used with
4818 * window probe and clear the event. Put
4819 * it back into the send queue as if has
4822 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
4823 if (tp1->window_probe) {
4824 sctp_window_probe_recovery(stcb, asoc, tp1);
4829 if (net->flight_size) {
4831 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4832 sctp_timer_start(SCTP_TIMER_TYPE_SEND,
4833 stcb->sctp_ep, stcb, net);
4835 if (net->window_probe) {
4836 net->window_probe = 0;
4839 if (net->window_probe) {
4841 * In window probes we must assure a timer
4842 * is still running there
4844 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4845 sctp_timer_start(SCTP_TIMER_TYPE_SEND,
4846 stcb->sctp_ep, stcb, net);
4849 } else if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4850 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
4852 SCTP_FROM_SCTP_INDATA + SCTP_LOC_22);
4857 (!TAILQ_EMPTY(&asoc->sent_queue)) &&
4858 (asoc->sent_queue_retran_cnt == 0) &&
4859 (win_probe_recovered == 0) &&
4862 * huh, this should not happen unless all packets are
4863 * PR-SCTP and marked to skip of course.
4865 if (sctp_fs_audit(asoc)) {
4866 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4867 net->flight_size = 0;
4869 asoc->total_flight = 0;
4870 asoc->total_flight_count = 0;
4871 asoc->sent_queue_retran_cnt = 0;
4872 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
4873 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
4874 sctp_flight_size_increase(tp1);
4875 sctp_total_flight_increase(stcb, tp1);
4876 } else if (tp1->sent == SCTP_DATAGRAM_RESEND) {
4877 sctp_ucount_incr(asoc->sent_queue_retran_cnt);
4884 /*********************************************/
4885 /* Here we perform PR-SCTP procedures */
4887 /*********************************************/
4888 /* C1. update advancedPeerAckPoint */
4889 if (SCTP_TSN_GT(cum_ack, asoc->advanced_peer_ack_point)) {
4890 asoc->advanced_peer_ack_point = cum_ack;
4892 /* C2. try to further move advancedPeerAckPoint ahead */
4893 if ((asoc->peer_supports_prsctp) && (asoc->pr_sctp_cnt > 0)) {
4894 struct sctp_tmit_chunk *lchk;
4895 uint32_t old_adv_peer_ack_point;
4897 old_adv_peer_ack_point = asoc->advanced_peer_ack_point;
4898 lchk = sctp_try_advance_peer_ack_point(stcb, asoc);
4899 /* C3. See if we need to send a Fwd-TSN */
4900 if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, cum_ack)) {
4902 * ISSUE with ECN, see FWD-TSN processing.
4904 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
4905 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
4906 0xee, cum_ack, asoc->advanced_peer_ack_point,
4907 old_adv_peer_ack_point);
4909 if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, old_adv_peer_ack_point)) {
4910 send_forward_tsn(stcb, asoc);
4912 /* try to FR fwd-tsn's that get lost too */
4913 if (lchk->rec.data.fwd_tsn_cnt >= 3) {
4914 send_forward_tsn(stcb, asoc);
4919 /* Assure a timer is up */
4920 sctp_timer_start(SCTP_TIMER_TYPE_SEND,
4921 stcb->sctp_ep, stcb, lchk->whoTo);
4924 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_RWND_LOGGING_ENABLE) {
4925 sctp_misc_ints(SCTP_SACK_RWND_UPDATE,
4927 stcb->asoc.peers_rwnd,
4928 stcb->asoc.total_flight,
4929 stcb->asoc.total_output_queue_size);
4934 sctp_update_acked(struct sctp_tcb *stcb, struct sctp_shutdown_chunk *cp, int *abort_flag)
4937 uint32_t cum_ack, a_rwnd;
4939 cum_ack = ntohl(cp->cumulative_tsn_ack);
4940 /* Arrange so a_rwnd does NOT change */
4941 a_rwnd = stcb->asoc.peers_rwnd + stcb->asoc.total_flight;
4943 /* Now call the express sack handling */
4944 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, abort_flag, 0);
4948 sctp_kick_prsctp_reorder_queue(struct sctp_tcb *stcb,
4949 struct sctp_stream_in *strmin)
4951 struct sctp_queued_to_read *ctl, *nctl;
4952 struct sctp_association *asoc;
4956 tt = strmin->last_sequence_delivered;
4958 * First deliver anything prior to and including the stream no that
4961 TAILQ_FOREACH_SAFE(ctl, &strmin->inqueue, next, nctl) {
4962 if (SCTP_SSN_GE(tt, ctl->sinfo_ssn)) {
4963 /* this is deliverable now */
4964 TAILQ_REMOVE(&strmin->inqueue, ctl, next);
4965 /* subtract pending on streams */
4966 asoc->size_on_all_streams -= ctl->length;
4967 sctp_ucount_decr(asoc->cnt_on_all_streams);
4968 /* deliver it to at least the delivery-q */
4969 if (stcb->sctp_socket) {
4970 sctp_mark_non_revokable(asoc, ctl->sinfo_tsn);
4971 sctp_add_to_readq(stcb->sctp_ep, stcb,
4973 &stcb->sctp_socket->so_rcv, 1, SCTP_READ_LOCK_HELD, SCTP_SO_NOT_LOCKED);
4976 /* no more delivery now. */
4981 * now we must deliver things in queue the normal way if any are
4984 tt = strmin->last_sequence_delivered + 1;
4985 TAILQ_FOREACH_SAFE(ctl, &strmin->inqueue, next, nctl) {
4986 if (tt == ctl->sinfo_ssn) {
4987 /* this is deliverable now */
4988 TAILQ_REMOVE(&strmin->inqueue, ctl, next);
4989 /* subtract pending on streams */
4990 asoc->size_on_all_streams -= ctl->length;
4991 sctp_ucount_decr(asoc->cnt_on_all_streams);
4992 /* deliver it to at least the delivery-q */
4993 strmin->last_sequence_delivered = ctl->sinfo_ssn;
4994 if (stcb->sctp_socket) {
4995 sctp_mark_non_revokable(asoc, ctl->sinfo_tsn);
4996 sctp_add_to_readq(stcb->sctp_ep, stcb,
4998 &stcb->sctp_socket->so_rcv, 1, SCTP_READ_LOCK_HELD, SCTP_SO_NOT_LOCKED);
5001 tt = strmin->last_sequence_delivered + 1;
5009 sctp_flush_reassm_for_str_seq(struct sctp_tcb *stcb,
5010 struct sctp_association *asoc,
5011 uint16_t stream, uint16_t seq)
5013 struct sctp_tmit_chunk *chk, *nchk;
5015 /* For each one on here see if we need to toss it */
5017 * For now large messages held on the reasmqueue that are complete
5018 * will be tossed too. We could in theory do more work to spin
5019 * through and stop after dumping one msg aka seeing the start of a
5020 * new msg at the head, and call the delivery function... to see if
5021 * it can be delivered... But for now we just dump everything on the
5024 TAILQ_FOREACH_SAFE(chk, &asoc->reasmqueue, sctp_next, nchk) {
5026 * Do not toss it if on a different stream or marked for
5027 * unordered delivery in which case the stream sequence
5028 * number has no meaning.
5030 if ((chk->rec.data.stream_number != stream) ||
5031 ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == SCTP_DATA_UNORDERED)) {
5034 if (chk->rec.data.stream_seq == seq) {
5035 /* It needs to be tossed */
5036 TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next);
5037 if (SCTP_TSN_GT(chk->rec.data.TSN_seq, asoc->tsn_last_delivered)) {
5038 asoc->tsn_last_delivered = chk->rec.data.TSN_seq;
5039 asoc->str_of_pdapi = chk->rec.data.stream_number;
5040 asoc->ssn_of_pdapi = chk->rec.data.stream_seq;
5041 asoc->fragment_flags = chk->rec.data.rcv_flags;
5043 asoc->size_on_reasm_queue -= chk->send_size;
5044 sctp_ucount_decr(asoc->cnt_on_reasm_queue);
5046 /* Clear up any stream problem */
5047 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) != SCTP_DATA_UNORDERED &&
5048 SCTP_SSN_GT(chk->rec.data.stream_seq, asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered)) {
5050 * We must dump forward this streams
5051 * sequence number if the chunk is not
5052 * unordered that is being skipped. There is
5053 * a chance that if the peer does not
5054 * include the last fragment in its FWD-TSN
5055 * we WILL have a problem here since you
5056 * would have a partial chunk in queue that
5057 * may not be deliverable. Also if a Partial
5058 * delivery API as started the user may get
5059 * a partial chunk. The next read returning
5060 * a new chunk... really ugly but I see no
5061 * way around it! Maybe a notify??
5063 asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered = chk->rec.data.stream_seq;
5066 sctp_m_freem(chk->data);
5069 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
5070 } else if (SCTP_SSN_GT(chk->rec.data.stream_seq, seq)) {
5072 * If the stream_seq is > than the purging one, we
5082 sctp_handle_forward_tsn(struct sctp_tcb *stcb,
5083 struct sctp_forward_tsn_chunk *fwd,
5084 int *abort_flag, struct mbuf *m, int offset)
5086 /* The pr-sctp fwd tsn */
5088 * here we will perform all the data receiver side steps for
5089 * processing FwdTSN, as required in by pr-sctp draft:
5091 * Assume we get FwdTSN(x):
5093 * 1) update local cumTSN to x 2) try to further advance cumTSN to x +
5094 * others we have 3) examine and update re-ordering queue on
5095 * pr-in-streams 4) clean up re-assembly queue 5) Send a sack to
5096 * report where we are.
5098 struct sctp_association *asoc;
5099 uint32_t new_cum_tsn, gap;
5100 unsigned int i, fwd_sz, m_size;
5102 struct sctp_stream_in *strm;
5103 struct sctp_tmit_chunk *chk, *nchk;
5104 struct sctp_queued_to_read *ctl, *sv;
5107 if ((fwd_sz = ntohs(fwd->ch.chunk_length)) < sizeof(struct sctp_forward_tsn_chunk)) {
5108 SCTPDBG(SCTP_DEBUG_INDATA1,
5109 "Bad size too small/big fwd-tsn\n");
5112 m_size = (stcb->asoc.mapping_array_size << 3);
5113 /*************************************************************/
5114 /* 1. Here we update local cumTSN and shift the bitmap array */
5115 /*************************************************************/
5116 new_cum_tsn = ntohl(fwd->new_cumulative_tsn);
5118 if (SCTP_TSN_GE(asoc->cumulative_tsn, new_cum_tsn)) {
5119 /* Already got there ... */
5123 * now we know the new TSN is more advanced, let's find the actual
5126 SCTP_CALC_TSN_TO_GAP(gap, new_cum_tsn, asoc->mapping_array_base_tsn);
5127 asoc->cumulative_tsn = new_cum_tsn;
5128 if (gap >= m_size) {
5129 if ((long)gap > sctp_sbspace(&stcb->asoc, &stcb->sctp_socket->so_rcv)) {
5130 struct mbuf *op_err;
5131 char msg[SCTP_DIAG_INFO_LEN];
5134 * out of range (of single byte chunks in the rwnd I
5135 * give out). This must be an attacker.
5138 snprintf(msg, sizeof(msg),
5139 "New cum ack %8.8x too high, highest TSN %8.8x",
5140 new_cum_tsn, asoc->highest_tsn_inside_map);
5141 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
5142 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_33;
5143 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
5146 SCTP_STAT_INCR(sctps_fwdtsn_map_over);
5148 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
5149 asoc->mapping_array_base_tsn = new_cum_tsn + 1;
5150 asoc->highest_tsn_inside_map = new_cum_tsn;
5152 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
5153 asoc->highest_tsn_inside_nr_map = new_cum_tsn;
5155 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
5156 sctp_log_map(0, 3, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
5159 SCTP_TCB_LOCK_ASSERT(stcb);
5160 for (i = 0; i <= gap; i++) {
5161 if (!SCTP_IS_TSN_PRESENT(asoc->mapping_array, i) &&
5162 !SCTP_IS_TSN_PRESENT(asoc->nr_mapping_array, i)) {
5163 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, i);
5164 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn + i, asoc->highest_tsn_inside_nr_map)) {
5165 asoc->highest_tsn_inside_nr_map = asoc->mapping_array_base_tsn + i;
5170 /*************************************************************/
5171 /* 2. Clear up re-assembly queue */
5172 /*************************************************************/
5174 * First service it if pd-api is up, just in case we can progress it
5177 if (asoc->fragmented_delivery_inprogress) {
5178 sctp_service_reassembly(stcb, asoc);
5180 /* For each one on here see if we need to toss it */
5182 * For now large messages held on the reasmqueue that are complete
5183 * will be tossed too. We could in theory do more work to spin
5184 * through and stop after dumping one msg aka seeing the start of a
5185 * new msg at the head, and call the delivery function... to see if
5186 * it can be delivered... But for now we just dump everything on the
5189 TAILQ_FOREACH_SAFE(chk, &asoc->reasmqueue, sctp_next, nchk) {
5190 if (SCTP_TSN_GE(new_cum_tsn, chk->rec.data.TSN_seq)) {
5191 /* It needs to be tossed */
5192 TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next);
5193 if (SCTP_TSN_GT(chk->rec.data.TSN_seq, asoc->tsn_last_delivered)) {
5194 asoc->tsn_last_delivered = chk->rec.data.TSN_seq;
5195 asoc->str_of_pdapi = chk->rec.data.stream_number;
5196 asoc->ssn_of_pdapi = chk->rec.data.stream_seq;
5197 asoc->fragment_flags = chk->rec.data.rcv_flags;
5199 asoc->size_on_reasm_queue -= chk->send_size;
5200 sctp_ucount_decr(asoc->cnt_on_reasm_queue);
5202 /* Clear up any stream problem */
5203 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) != SCTP_DATA_UNORDERED &&
5204 SCTP_SSN_GT(chk->rec.data.stream_seq, asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered)) {
5206 * We must dump forward this streams
5207 * sequence number if the chunk is not
5208 * unordered that is being skipped. There is
5209 * a chance that if the peer does not
5210 * include the last fragment in its FWD-TSN
5211 * we WILL have a problem here since you
5212 * would have a partial chunk in queue that
5213 * may not be deliverable. Also if a Partial
5214 * delivery API as started the user may get
5215 * a partial chunk. The next read returning
5216 * a new chunk... really ugly but I see no
5217 * way around it! Maybe a notify??
5219 asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered = chk->rec.data.stream_seq;
5222 sctp_m_freem(chk->data);
5225 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
5228 * Ok we have gone beyond the end of the fwd-tsn's
5234 /*******************************************************/
5235 /* 3. Update the PR-stream re-ordering queues and fix */
5236 /* delivery issues as needed. */
5237 /*******************************************************/
5238 fwd_sz -= sizeof(*fwd);
5241 unsigned int num_str;
5242 struct sctp_strseq *stseq, strseqbuf;
5244 offset += sizeof(*fwd);
5246 SCTP_INP_READ_LOCK(stcb->sctp_ep);
5247 num_str = fwd_sz / sizeof(struct sctp_strseq);
5248 for (i = 0; i < num_str; i++) {
5251 stseq = (struct sctp_strseq *)sctp_m_getptr(m, offset,
5252 sizeof(struct sctp_strseq),
5253 (uint8_t *) & strseqbuf);
5254 offset += sizeof(struct sctp_strseq);
5255 if (stseq == NULL) {
5259 st = ntohs(stseq->stream);
5261 st = ntohs(stseq->sequence);
5262 stseq->sequence = st;
5267 * Ok we now look for the stream/seq on the read
5268 * queue where its not all delivered. If we find it
5269 * we transmute the read entry into a PDI_ABORTED.
5271 if (stseq->stream >= asoc->streamincnt) {
5272 /* screwed up streams, stop! */
5275 if ((asoc->str_of_pdapi == stseq->stream) &&
5276 (asoc->ssn_of_pdapi == stseq->sequence)) {
5278 * If this is the one we were partially
5279 * delivering now then we no longer are.
5280 * Note this will change with the reassembly
5283 asoc->fragmented_delivery_inprogress = 0;
5285 sctp_flush_reassm_for_str_seq(stcb, asoc, stseq->stream, stseq->sequence);
5286 TAILQ_FOREACH(ctl, &stcb->sctp_ep->read_queue, next) {
5287 if ((ctl->sinfo_stream == stseq->stream) &&
5288 (ctl->sinfo_ssn == stseq->sequence)) {
5289 str_seq = (stseq->stream << 16) | stseq->sequence;
5291 ctl->pdapi_aborted = 1;
5292 sv = stcb->asoc.control_pdapi;
5293 stcb->asoc.control_pdapi = ctl;
5294 sctp_ulp_notify(SCTP_NOTIFY_PARTIAL_DELVIERY_INDICATION,
5296 SCTP_PARTIAL_DELIVERY_ABORTED,
5298 SCTP_SO_NOT_LOCKED);
5299 stcb->asoc.control_pdapi = sv;
5301 } else if ((ctl->sinfo_stream == stseq->stream) &&
5302 SCTP_SSN_GT(ctl->sinfo_ssn, stseq->sequence)) {
5303 /* We are past our victim SSN */
5307 strm = &asoc->strmin[stseq->stream];
5308 if (SCTP_SSN_GT(stseq->sequence, strm->last_sequence_delivered)) {
5309 /* Update the sequence number */
5310 strm->last_sequence_delivered = stseq->sequence;
5312 /* now kick the stream the new way */
5313 /* sa_ignore NO_NULL_CHK */
5314 sctp_kick_prsctp_reorder_queue(stcb, strm);
5316 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
5319 * Now slide thing forward.
5321 sctp_slide_mapping_arrays(stcb);
5323 if (!TAILQ_EMPTY(&asoc->reasmqueue)) {
5324 /* now lets kick out and check for more fragmented delivery */
5325 /* sa_ignore NO_NULL_CHK */
5326 sctp_deliver_reasm_check(stcb, &stcb->asoc);