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.
16 * c) Neither the name of Cisco Systems, Inc. nor the names of its
17 * contributors may be used to endorse or promote products derived
18 * from this software without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
22 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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30 * THE POSSIBILITY OF SUCH DAMAGE.
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
36 #include <netinet/sctp_os.h>
38 #include <netinet/sctp_var.h>
39 #include <netinet/sctp_sysctl.h>
40 #include <netinet/sctp_header.h>
41 #include <netinet/sctp_pcb.h>
42 #include <netinet/sctputil.h>
43 #include <netinet/sctp_output.h>
44 #include <netinet/sctp_uio.h>
45 #include <netinet/sctp_auth.h>
46 #include <netinet/sctp_timer.h>
47 #include <netinet/sctp_asconf.h>
48 #include <netinet/sctp_indata.h>
49 #include <netinet/sctp_bsd_addr.h>
50 #include <netinet/sctp_input.h>
51 #include <netinet/sctp_crc32.h>
52 #include <netinet/sctp_lock_bsd.h>
54 * NOTES: On the outbound side of things I need to check the sack timer to
55 * see if I should generate a sack into the chunk queue (if I have data to
56 * send that is and will be sending it .. for bundling.
58 * The callback in sctp_usrreq.c will get called when the socket is read from.
59 * This will cause sctp_service_queues() to get called on the top entry in
63 sctp_add_chk_to_control(struct sctp_queued_to_read *control,
64 struct sctp_stream_in *strm,
65 struct sctp_tcb *stcb,
66 struct sctp_association *asoc,
67 struct sctp_tmit_chunk *chk, int lock_held);
71 sctp_set_rwnd(struct sctp_tcb *stcb, struct sctp_association *asoc)
73 asoc->my_rwnd = sctp_calc_rwnd(stcb, asoc);
76 /* Calculate what the rwnd would be */
78 sctp_calc_rwnd(struct sctp_tcb *stcb, struct sctp_association *asoc)
83 * This is really set wrong with respect to a 1-2-m socket. Since
84 * the sb_cc is the count that everyone as put up. When we re-write
85 * sctp_soreceive then we will fix this so that ONLY this
86 * associations data is taken into account.
88 if (stcb->sctp_socket == NULL) {
91 if (stcb->asoc.sb_cc == 0 &&
92 asoc->size_on_reasm_queue == 0 &&
93 asoc->size_on_all_streams == 0) {
94 /* Full rwnd granted */
95 calc = max(SCTP_SB_LIMIT_RCV(stcb->sctp_socket), SCTP_MINIMAL_RWND);
98 /* get actual space */
99 calc = (uint32_t) sctp_sbspace(&stcb->asoc, &stcb->sctp_socket->so_rcv);
101 * take out what has NOT been put on socket queue and we yet hold
104 calc = sctp_sbspace_sub(calc, (uint32_t) (asoc->size_on_reasm_queue +
105 asoc->cnt_on_reasm_queue * MSIZE));
106 calc = sctp_sbspace_sub(calc, (uint32_t) (asoc->size_on_all_streams +
107 asoc->cnt_on_all_streams * MSIZE));
112 /* what is the overhead of all these rwnd's */
113 calc = sctp_sbspace_sub(calc, stcb->asoc.my_rwnd_control_len);
115 * If the window gets too small due to ctrl-stuff, reduce it to 1,
116 * even it is 0. SWS engaged
118 if (calc < stcb->asoc.my_rwnd_control_len) {
127 * Build out our readq entry based on the incoming packet.
129 struct sctp_queued_to_read *
130 sctp_build_readq_entry(struct sctp_tcb *stcb,
131 struct sctp_nets *net,
132 uint32_t tsn, uint32_t ppid,
133 uint32_t context, uint16_t stream_no,
134 uint32_t stream_seq, uint8_t flags,
137 struct sctp_queued_to_read *read_queue_e = NULL;
139 sctp_alloc_a_readq(stcb, read_queue_e);
140 if (read_queue_e == NULL) {
143 memset(read_queue_e, 0, sizeof(struct sctp_queued_to_read));
144 read_queue_e->sinfo_stream = stream_no;
145 read_queue_e->sinfo_ssn = stream_seq;
146 read_queue_e->sinfo_flags = (flags << 8);
147 read_queue_e->sinfo_ppid = ppid;
148 read_queue_e->sinfo_context = context;
149 read_queue_e->sinfo_tsn = tsn;
150 read_queue_e->sinfo_cumtsn = tsn;
151 read_queue_e->sinfo_assoc_id = sctp_get_associd(stcb);
152 read_queue_e->top_fsn = read_queue_e->fsn_included = 0xffffffff;
153 TAILQ_INIT(&read_queue_e->reasm);
154 read_queue_e->whoFrom = net;
155 atomic_add_int(&net->ref_count, 1);
156 read_queue_e->data = dm;
157 read_queue_e->stcb = stcb;
158 read_queue_e->port_from = stcb->rport;
160 return (read_queue_e);
164 sctp_build_ctl_nchunk(struct sctp_inpcb *inp, struct sctp_sndrcvinfo *sinfo)
166 struct sctp_extrcvinfo *seinfo;
167 struct sctp_sndrcvinfo *outinfo;
168 struct sctp_rcvinfo *rcvinfo;
169 struct sctp_nxtinfo *nxtinfo;
176 if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_RECVDATAIOEVNT) &&
177 sctp_is_feature_off(inp, SCTP_PCB_FLAGS_RECVRCVINFO) &&
178 sctp_is_feature_off(inp, SCTP_PCB_FLAGS_RECVNXTINFO)) {
179 /* user does not want any ancillary data */
183 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVRCVINFO)) {
184 len += CMSG_SPACE(sizeof(struct sctp_rcvinfo));
186 seinfo = (struct sctp_extrcvinfo *)sinfo;
187 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVNXTINFO) &&
188 (seinfo->serinfo_next_flags & SCTP_NEXT_MSG_AVAIL)) {
190 len += CMSG_SPACE(sizeof(struct sctp_nxtinfo));
194 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVDATAIOEVNT)) {
195 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXT_RCVINFO)) {
197 len += CMSG_SPACE(sizeof(struct sctp_extrcvinfo));
200 len += CMSG_SPACE(sizeof(struct sctp_sndrcvinfo));
206 ret = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA);
211 SCTP_BUF_LEN(ret) = 0;
213 /* We need a CMSG header followed by the struct */
214 cmh = mtod(ret, struct cmsghdr *);
216 * Make sure that there is no un-initialized padding between the
217 * cmsg header and cmsg data and after the cmsg data.
220 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVRCVINFO)) {
221 cmh->cmsg_level = IPPROTO_SCTP;
222 cmh->cmsg_len = CMSG_LEN(sizeof(struct sctp_rcvinfo));
223 cmh->cmsg_type = SCTP_RCVINFO;
224 rcvinfo = (struct sctp_rcvinfo *)CMSG_DATA(cmh);
225 rcvinfo->rcv_sid = sinfo->sinfo_stream;
226 rcvinfo->rcv_ssn = sinfo->sinfo_ssn;
227 rcvinfo->rcv_flags = sinfo->sinfo_flags;
228 rcvinfo->rcv_ppid = sinfo->sinfo_ppid;
229 rcvinfo->rcv_tsn = sinfo->sinfo_tsn;
230 rcvinfo->rcv_cumtsn = sinfo->sinfo_cumtsn;
231 rcvinfo->rcv_context = sinfo->sinfo_context;
232 rcvinfo->rcv_assoc_id = sinfo->sinfo_assoc_id;
233 cmh = (struct cmsghdr *)((caddr_t)cmh + CMSG_SPACE(sizeof(struct sctp_rcvinfo)));
234 SCTP_BUF_LEN(ret) += CMSG_SPACE(sizeof(struct sctp_rcvinfo));
237 cmh->cmsg_level = IPPROTO_SCTP;
238 cmh->cmsg_len = CMSG_LEN(sizeof(struct sctp_nxtinfo));
239 cmh->cmsg_type = SCTP_NXTINFO;
240 nxtinfo = (struct sctp_nxtinfo *)CMSG_DATA(cmh);
241 nxtinfo->nxt_sid = seinfo->serinfo_next_stream;
242 nxtinfo->nxt_flags = 0;
243 if (seinfo->serinfo_next_flags & SCTP_NEXT_MSG_IS_UNORDERED) {
244 nxtinfo->nxt_flags |= SCTP_UNORDERED;
246 if (seinfo->serinfo_next_flags & SCTP_NEXT_MSG_IS_NOTIFICATION) {
247 nxtinfo->nxt_flags |= SCTP_NOTIFICATION;
249 if (seinfo->serinfo_next_flags & SCTP_NEXT_MSG_ISCOMPLETE) {
250 nxtinfo->nxt_flags |= SCTP_COMPLETE;
252 nxtinfo->nxt_ppid = seinfo->serinfo_next_ppid;
253 nxtinfo->nxt_length = seinfo->serinfo_next_length;
254 nxtinfo->nxt_assoc_id = seinfo->serinfo_next_aid;
255 cmh = (struct cmsghdr *)((caddr_t)cmh + CMSG_SPACE(sizeof(struct sctp_nxtinfo)));
256 SCTP_BUF_LEN(ret) += CMSG_SPACE(sizeof(struct sctp_nxtinfo));
258 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVDATAIOEVNT)) {
259 cmh->cmsg_level = IPPROTO_SCTP;
260 outinfo = (struct sctp_sndrcvinfo *)CMSG_DATA(cmh);
262 cmh->cmsg_len = CMSG_LEN(sizeof(struct sctp_extrcvinfo));
263 cmh->cmsg_type = SCTP_EXTRCV;
264 memcpy(outinfo, sinfo, sizeof(struct sctp_extrcvinfo));
265 SCTP_BUF_LEN(ret) += CMSG_SPACE(sizeof(struct sctp_extrcvinfo));
267 cmh->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo));
268 cmh->cmsg_type = SCTP_SNDRCV;
270 SCTP_BUF_LEN(ret) += CMSG_SPACE(sizeof(struct sctp_sndrcvinfo));
278 sctp_mark_non_revokable(struct sctp_association *asoc, uint32_t tsn)
280 uint32_t gap, i, cumackp1;
282 int in_r = 0, in_nr = 0;
284 if (SCTP_BASE_SYSCTL(sctp_do_drain) == 0) {
287 cumackp1 = asoc->cumulative_tsn + 1;
288 if (SCTP_TSN_GT(cumackp1, tsn)) {
290 * this tsn is behind the cum ack and thus we don't need to
291 * worry about it being moved from one to the other.
295 SCTP_CALC_TSN_TO_GAP(gap, tsn, asoc->mapping_array_base_tsn);
296 in_r = SCTP_IS_TSN_PRESENT(asoc->mapping_array, gap);
297 in_nr = SCTP_IS_TSN_PRESENT(asoc->nr_mapping_array, gap);
298 if ((in_r == 0) && (in_nr == 0)) {
300 panic("Things are really messed up now");
302 SCTP_PRINTF("gap:%x tsn:%x\n", gap, tsn);
303 sctp_print_mapping_array(asoc);
307 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap);
309 SCTP_UNSET_TSN_PRESENT(asoc->mapping_array, gap);
310 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) {
311 asoc->highest_tsn_inside_nr_map = tsn;
313 if (tsn == asoc->highest_tsn_inside_map) {
314 /* We must back down to see what the new highest is */
315 for (i = tsn - 1; SCTP_TSN_GE(i, asoc->mapping_array_base_tsn); i--) {
316 SCTP_CALC_TSN_TO_GAP(gap, i, asoc->mapping_array_base_tsn);
317 if (SCTP_IS_TSN_PRESENT(asoc->mapping_array, gap)) {
318 asoc->highest_tsn_inside_map = i;
324 asoc->highest_tsn_inside_map = asoc->mapping_array_base_tsn - 1;
330 sctp_place_control_in_stream(struct sctp_stream_in *strm,
331 struct sctp_association *asoc,
332 struct sctp_queued_to_read *control)
334 struct sctp_queued_to_read *at;
335 struct sctp_readhead *q;
336 uint8_t bits, unordered;
338 bits = (control->sinfo_flags >> 8);
339 unordered = bits & SCTP_DATA_UNORDERED;
341 q = &strm->uno_inqueue;
342 if (asoc->idata_supported == 0) {
343 if (!TAILQ_EMPTY(q)) {
345 * Only one stream can be here in old style
350 TAILQ_INSERT_TAIL(q, control, next_instrm);
351 control->on_strm_q = SCTP_ON_UNORDERED;
357 if ((bits & SCTP_DATA_NOT_FRAG) == SCTP_DATA_NOT_FRAG) {
358 control->end_added = control->last_frag_seen = control->first_frag_seen = 1;
360 if (TAILQ_EMPTY(q)) {
362 TAILQ_INSERT_HEAD(q, control, next_instrm);
364 control->on_strm_q = SCTP_ON_UNORDERED;
366 control->on_strm_q = SCTP_ON_ORDERED;
370 TAILQ_FOREACH(at, q, next_instrm) {
371 if (SCTP_TSN_GT(at->msg_id, control->msg_id)) {
373 * one in queue is bigger than the new one,
374 * insert before this one
376 TAILQ_INSERT_BEFORE(at, control, next_instrm);
378 control->on_strm_q = SCTP_ON_UNORDERED;
380 control->on_strm_q = SCTP_ON_ORDERED;
383 } else if (at->msg_id == control->msg_id) {
385 * Gak, He sent me a duplicate msg id
386 * number?? return -1 to abort.
390 if (TAILQ_NEXT(at, next_instrm) == NULL) {
392 * We are at the end, insert it
395 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
396 sctp_log_strm_del(control, at,
397 SCTP_STR_LOG_FROM_INSERT_TL);
399 TAILQ_INSERT_AFTER(q,
400 at, control, next_instrm);
402 control->on_strm_q = SCTP_ON_UNORDERED;
404 control->on_strm_q = SCTP_ON_ORDERED;
415 sctp_abort_in_reasm(struct sctp_tcb *stcb,
416 struct sctp_queued_to_read *control,
417 struct sctp_tmit_chunk *chk,
418 int *abort_flag, int opspot)
420 char msg[SCTP_DIAG_INFO_LEN];
423 if (stcb->asoc.idata_supported) {
424 snprintf(msg, sizeof(msg),
425 "Reass %x,CF:%x,TSN=%8.8x,SID=%4.4x,FSN=%8.8x,MID:%8.8x",
427 control->fsn_included,
428 chk->rec.data.TSN_seq,
429 chk->rec.data.stream_number,
430 chk->rec.data.fsn_num, chk->rec.data.stream_seq);
432 snprintf(msg, sizeof(msg),
433 "Reass %x,CI:%x,TSN=%8.8x,SID=%4.4x,FSN=%4.4x,SSN:%4.4x",
435 control->fsn_included,
436 chk->rec.data.TSN_seq,
437 chk->rec.data.stream_number,
438 chk->rec.data.fsn_num,
439 (uint16_t) chk->rec.data.stream_seq);
441 oper = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
442 sctp_m_freem(chk->data);
444 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
445 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_1;
446 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED);
451 sctp_clean_up_control(struct sctp_tcb *stcb, struct sctp_queued_to_read *control)
454 * The control could not be placed and must be cleaned.
456 struct sctp_tmit_chunk *chk, *nchk;
458 TAILQ_FOREACH_SAFE(chk, &control->reasm, sctp_next, nchk) {
459 TAILQ_REMOVE(&control->reasm, chk, sctp_next);
461 sctp_m_freem(chk->data);
463 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
465 sctp_free_a_readq(stcb, control);
469 * Queue the chunk either right into the socket buffer if it is the next one
470 * to go OR put it in the correct place in the delivery queue. If we do
471 * append to the so_buf, keep doing so until we are out of order as
472 * long as the control's entered are non-fragmented.
475 sctp_queue_data_to_stream(struct sctp_tcb *stcb,
476 struct sctp_stream_in *strm,
477 struct sctp_association *asoc,
478 struct sctp_queued_to_read *control, int *abort_flag, int *need_reasm)
481 * FIX-ME maybe? What happens when the ssn wraps? If we are getting
482 * all the data in one stream this could happen quite rapidly. One
483 * could use the TSN to keep track of things, but this scheme breaks
484 * down in the other type of stream usage that could occur. Send a
485 * single msg to stream 0, send 4Billion messages to stream 1, now
486 * send a message to stream 0. You have a situation where the TSN
487 * has wrapped but not in the stream. Is this worth worrying about
488 * or should we just change our queue sort at the bottom to be by
491 * Could it also be legal for a peer to send ssn 1 with TSN 2 and ssn 2
492 * with TSN 1? If the peer is doing some sort of funky TSN/SSN
493 * assignment this could happen... and I don't see how this would be
494 * a violation. So for now I am undecided an will leave the sort by
495 * SSN alone. Maybe a hybred approach is the answer
498 struct sctp_queued_to_read *at;
502 char msg[SCTP_DIAG_INFO_LEN];
504 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
505 sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_INTO_STRD);
507 if (SCTP_MSGID_GT((!asoc->idata_supported), strm->last_sequence_delivered, control->sinfo_ssn)) {
508 /* The incoming sseq is behind where we last delivered? */
509 SCTPDBG(SCTP_DEBUG_INDATA1, "Duplicate S-SEQ: %u delivered: %u from peer, Abort association\n",
510 control->sinfo_ssn, strm->last_sequence_delivered);
513 * throw it in the stream so it gets cleaned up in
514 * association destruction
516 TAILQ_INSERT_HEAD(&strm->inqueue, control, next_instrm);
517 snprintf(msg, sizeof(msg), "Delivered SSN=%4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
518 strm->last_sequence_delivered, control->sinfo_tsn,
519 control->sinfo_stream, control->sinfo_ssn);
520 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
521 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_2;
522 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
527 if ((SCTP_TSN_GE(asoc->cumulative_tsn, control->sinfo_tsn)) && (asoc->idata_supported == 0)) {
531 asoc->size_on_all_streams += control->length;
532 sctp_ucount_incr(asoc->cnt_on_all_streams);
533 nxt_todel = strm->last_sequence_delivered + 1;
534 if (nxt_todel == control->sinfo_ssn) {
535 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
538 so = SCTP_INP_SO(stcb->sctp_ep);
539 atomic_add_int(&stcb->asoc.refcnt, 1);
540 SCTP_TCB_UNLOCK(stcb);
541 SCTP_SOCKET_LOCK(so, 1);
543 atomic_subtract_int(&stcb->asoc.refcnt, 1);
544 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
545 SCTP_SOCKET_UNLOCK(so, 1);
549 /* can be delivered right away? */
550 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
551 sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_IMMED_DEL);
553 /* EY it wont be queued if it could be delivered directly */
555 asoc->size_on_all_streams -= control->length;
556 sctp_ucount_decr(asoc->cnt_on_all_streams);
557 strm->last_sequence_delivered++;
558 sctp_mark_non_revokable(asoc, control->sinfo_tsn);
559 sctp_add_to_readq(stcb->sctp_ep, stcb,
561 &stcb->sctp_socket->so_rcv, 1,
562 SCTP_READ_LOCK_NOT_HELD, SCTP_SO_LOCKED);
563 TAILQ_FOREACH_SAFE(control, &strm->inqueue, next_instrm, at) {
565 nxt_todel = strm->last_sequence_delivered + 1;
566 if ((nxt_todel == control->sinfo_ssn) &&
567 (((control->sinfo_flags >> 8) & SCTP_DATA_NOT_FRAG) == SCTP_DATA_NOT_FRAG)) {
568 asoc->size_on_all_streams -= control->length;
569 sctp_ucount_decr(asoc->cnt_on_all_streams);
570 if (control->on_strm_q == SCTP_ON_ORDERED) {
571 TAILQ_REMOVE(&strm->inqueue, control, next_instrm);
574 panic("Huh control: %p is on_strm_q: %d",
575 control, control->on_strm_q);
578 control->on_strm_q = 0;
579 strm->last_sequence_delivered++;
581 * We ignore the return of deliver_data here
582 * since we always can hold the chunk on the
583 * d-queue. And we have a finite number that
584 * can be delivered from the strq.
586 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
587 sctp_log_strm_del(control, NULL,
588 SCTP_STR_LOG_FROM_IMMED_DEL);
590 sctp_mark_non_revokable(asoc, control->sinfo_tsn);
591 sctp_add_to_readq(stcb->sctp_ep, stcb,
593 &stcb->sctp_socket->so_rcv, 1,
594 SCTP_READ_LOCK_NOT_HELD,
597 } else if (nxt_todel == control->sinfo_ssn) {
602 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
603 SCTP_SOCKET_UNLOCK(so, 1);
608 * Ok, we did not deliver this guy, find the correct place
609 * to put it on the queue.
611 if (sctp_place_control_in_stream(strm, asoc, control)) {
612 snprintf(msg, sizeof(msg),
613 "Queue to str msg_id: %u duplicate",
615 sctp_clean_up_control(stcb, control);
616 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
617 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_3;
618 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
626 sctp_setup_tail_pointer(struct sctp_queued_to_read *control)
628 struct mbuf *m, *prev = NULL;
629 struct sctp_tcb *stcb;
631 stcb = control->stcb;
632 control->held_length = 0;
636 if (SCTP_BUF_LEN(m) == 0) {
637 /* Skip mbufs with NO length */
640 control->data = sctp_m_free(m);
643 SCTP_BUF_NEXT(prev) = sctp_m_free(m);
644 m = SCTP_BUF_NEXT(prev);
647 control->tail_mbuf = prev;
652 atomic_add_int(&control->length, SCTP_BUF_LEN(m));
653 if (control->on_read_q) {
655 * On read queue so we must increment the SB stuff,
656 * we assume caller has done any locks of SB.
658 sctp_sballoc(stcb, &stcb->sctp_socket->so_rcv, m);
660 m = SCTP_BUF_NEXT(m);
663 control->tail_mbuf = prev;
668 sctp_add_to_tail_pointer(struct sctp_queued_to_read *control, struct mbuf *m)
670 struct mbuf *prev = NULL;
671 struct sctp_tcb *stcb;
673 stcb = control->stcb;
676 panic("Control broken");
681 if (control->tail_mbuf == NULL) {
684 sctp_setup_tail_pointer(control);
687 control->tail_mbuf->m_next = m;
689 if (SCTP_BUF_LEN(m) == 0) {
690 /* Skip mbufs with NO length */
693 control->tail_mbuf->m_next = sctp_m_free(m);
694 m = control->tail_mbuf->m_next;
696 SCTP_BUF_NEXT(prev) = sctp_m_free(m);
697 m = SCTP_BUF_NEXT(prev);
700 control->tail_mbuf = prev;
705 if (control->on_read_q) {
707 * On read queue so we must increment the SB stuff,
708 * we assume caller has done any locks of SB.
710 sctp_sballoc(stcb, &stcb->sctp_socket->so_rcv, m);
712 atomic_add_int(&control->length, SCTP_BUF_LEN(m));
713 m = SCTP_BUF_NEXT(m);
716 control->tail_mbuf = prev;
721 sctp_build_readq_entry_from_ctl(struct sctp_queued_to_read *nc, struct sctp_queued_to_read *control)
723 memset(nc, 0, sizeof(struct sctp_queued_to_read));
724 nc->sinfo_stream = control->sinfo_stream;
725 nc->sinfo_ssn = control->sinfo_ssn;
726 TAILQ_INIT(&nc->reasm);
727 nc->top_fsn = control->top_fsn;
728 nc->msg_id = control->msg_id;
729 nc->sinfo_flags = control->sinfo_flags;
730 nc->sinfo_ppid = control->sinfo_ppid;
731 nc->sinfo_context = control->sinfo_context;
732 nc->fsn_included = 0xffffffff;
733 nc->sinfo_tsn = control->sinfo_tsn;
734 nc->sinfo_cumtsn = control->sinfo_cumtsn;
735 nc->sinfo_assoc_id = control->sinfo_assoc_id;
736 nc->whoFrom = control->whoFrom;
737 atomic_add_int(&nc->whoFrom->ref_count, 1);
738 nc->stcb = control->stcb;
739 nc->port_from = control->port_from;
743 sctp_reset_a_control(struct sctp_queued_to_read *control,
744 struct sctp_inpcb *inp, uint32_t tsn)
746 control->fsn_included = tsn;
747 if (control->on_read_q) {
749 * We have to purge it from there, hopefully this will work
752 TAILQ_REMOVE(&inp->read_queue, control, next);
753 control->on_read_q = 0;
758 sctp_handle_old_unordered_data(struct sctp_tcb *stcb,
759 struct sctp_association *asoc,
760 struct sctp_stream_in *strm,
761 struct sctp_queued_to_read *control,
763 int inp_read_lock_held)
766 * Special handling for the old un-ordered data chunk. All the
767 * chunks/TSN's go to msg_id 0. So we have to do the old style
768 * watching to see if we have it all. If you return one, no other
769 * control entries on the un-ordered queue will be looked at. In
770 * theory there should be no others entries in reality, unless the
771 * guy is sending both unordered NDATA and unordered DATA...
773 struct sctp_tmit_chunk *chk, *lchk, *tchk;
775 struct sctp_queued_to_read *nc;
778 if (control->first_frag_seen == 0) {
779 /* Nothing we can do, we have not seen the first piece yet */
782 /* Collapse any we can */
785 fsn = control->fsn_included + 1;
786 /* Now what can we add? */
787 TAILQ_FOREACH_SAFE(chk, &control->reasm, sctp_next, lchk) {
788 if (chk->rec.data.fsn_num == fsn) {
790 sctp_alloc_a_readq(stcb, nc);
794 memset(nc, 0, sizeof(struct sctp_queued_to_read));
795 TAILQ_REMOVE(&control->reasm, chk, sctp_next);
796 sctp_add_chk_to_control(control, strm, stcb, asoc, chk, SCTP_READ_LOCK_NOT_HELD);
800 if (control->end_added) {
802 if (!TAILQ_EMPTY(&control->reasm)) {
804 * Ok we have to move anything left
805 * on the control queue to a new
808 sctp_build_readq_entry_from_ctl(nc, control);
809 tchk = TAILQ_FIRST(&control->reasm);
810 if (tchk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) {
811 TAILQ_REMOVE(&control->reasm, tchk, sctp_next);
812 asoc->size_on_reasm_queue -= tchk->send_size;
813 sctp_ucount_decr(asoc->cnt_on_reasm_queue);
814 nc->first_frag_seen = 1;
815 nc->fsn_included = tchk->rec.data.fsn_num;
816 nc->data = tchk->data;
817 nc->sinfo_ppid = tchk->rec.data.payloadtype;
818 nc->sinfo_tsn = tchk->rec.data.TSN_seq;
819 sctp_mark_non_revokable(asoc, tchk->rec.data.TSN_seq);
821 sctp_free_a_chunk(stcb, tchk, SCTP_SO_NOT_LOCKED);
822 sctp_setup_tail_pointer(nc);
823 tchk = TAILQ_FIRST(&control->reasm);
825 /* Spin the rest onto the queue */
827 TAILQ_REMOVE(&control->reasm, tchk, sctp_next);
828 TAILQ_INSERT_TAIL(&nc->reasm, tchk, sctp_next);
829 tchk = TAILQ_FIRST(&control->reasm);
832 * Now lets add it to the queue
833 * after removing control
835 TAILQ_INSERT_TAIL(&strm->uno_inqueue, nc, next_instrm);
836 nc->on_strm_q = SCTP_ON_UNORDERED;
837 if (control->on_strm_q) {
838 TAILQ_REMOVE(&strm->uno_inqueue, control, next_instrm);
839 control->on_strm_q = 0;
842 if (control->pdapi_started) {
843 strm->pd_api_started = 0;
844 control->pdapi_started = 0;
846 if (control->on_strm_q) {
847 TAILQ_REMOVE(&strm->uno_inqueue, control, next_instrm);
848 control->on_strm_q = 0;
849 SCTP_STAT_INCR_COUNTER64(sctps_reasmusrmsgs);
851 if (control->on_read_q == 0) {
852 sctp_add_to_readq(stcb->sctp_ep, stcb, control,
853 &stcb->sctp_socket->so_rcv, control->end_added,
854 inp_read_lock_held, SCTP_SO_NOT_LOCKED);
856 sctp_wakeup_the_read_socket(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
857 if ((nc->first_frag_seen) && !TAILQ_EMPTY(&nc->reasm)) {
859 * Switch to the new guy and
865 if (nc->on_strm_q == 0) {
866 sctp_free_a_readq(stcb, nc);
871 sctp_free_a_readq(stcb, nc);
878 if ((control->length > pd_point) && (strm->pd_api_started == 0)) {
879 strm->pd_api_started = 1;
880 control->pdapi_started = 1;
881 sctp_add_to_readq(stcb->sctp_ep, stcb, control,
882 &stcb->sctp_socket->so_rcv, control->end_added,
883 inp_read_lock_held, SCTP_SO_NOT_LOCKED);
884 sctp_wakeup_the_read_socket(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
892 sctp_inject_old_unordered_data(struct sctp_tcb *stcb,
893 struct sctp_association *asoc,
894 struct sctp_queued_to_read *control,
895 struct sctp_tmit_chunk *chk,
898 struct sctp_tmit_chunk *at;
902 * Here we need to place the chunk into the control structure sorted
903 * in the correct order.
905 if (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) {
906 /* Its the very first one. */
907 SCTPDBG(SCTP_DEBUG_XXX,
908 "chunk is a first fsn: %u becomes fsn_included\n",
909 chk->rec.data.fsn_num);
910 if (control->first_frag_seen) {
912 * In old un-ordered we can reassembly on one
913 * control multiple messages. As long as the next
914 * FIRST is greater then the old first (TSN i.e. FSN
920 if (SCTP_TSN_GT(chk->rec.data.fsn_num, control->fsn_included)) {
922 * Easy way the start of a new guy beyond
927 if ((chk->rec.data.fsn_num == control->fsn_included) ||
928 (control->pdapi_started)) {
930 * Ok this should not happen, if it does we
931 * started the pd-api on the higher TSN
932 * (since the equals part is a TSN failure
935 * We are completly hosed in that case since I
936 * have no way to recover. This really will
937 * only happen if we can get more TSN's
938 * higher before the pd-api-point.
940 sctp_abort_in_reasm(stcb, control, chk,
942 SCTP_FROM_SCTP_INDATA + SCTP_LOC_4);
947 * Ok we have two firsts and the one we just got is
948 * smaller than the one we previously placed.. yuck!
949 * We must swap them out.
952 tdata = control->data;
953 control->data = chk->data;
955 /* Save the lengths */
956 chk->send_size = control->length;
957 /* Recompute length of control and tail pointer */
958 sctp_setup_tail_pointer(control);
959 /* Fix the FSN included */
960 tmp = control->fsn_included;
961 control->fsn_included = chk->rec.data.fsn_num;
962 chk->rec.data.fsn_num = tmp;
963 /* Fix the TSN included */
964 tmp = control->sinfo_tsn;
965 control->sinfo_tsn = chk->rec.data.TSN_seq;
966 chk->rec.data.TSN_seq = tmp;
967 /* Fix the PPID included */
968 tmp = control->sinfo_ppid;
969 control->sinfo_ppid = chk->rec.data.payloadtype;
970 chk->rec.data.payloadtype = tmp;
971 /* Fix tail pointer */
974 control->first_frag_seen = 1;
975 control->top_fsn = control->fsn_included = chk->rec.data.fsn_num;
976 control->sinfo_tsn = chk->rec.data.TSN_seq;
977 control->sinfo_ppid = chk->rec.data.payloadtype;
978 control->data = chk->data;
979 sctp_mark_non_revokable(asoc, chk->rec.data.TSN_seq);
981 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
982 sctp_setup_tail_pointer(control);
987 TAILQ_FOREACH(at, &control->reasm, sctp_next) {
988 if (SCTP_TSN_GT(at->rec.data.fsn_num, chk->rec.data.fsn_num)) {
990 * This one in queue is bigger than the new one,
991 * insert the new one before at.
993 asoc->size_on_reasm_queue += chk->send_size;
994 sctp_ucount_incr(asoc->cnt_on_reasm_queue);
996 TAILQ_INSERT_BEFORE(at, chk, sctp_next);
998 } else if (at->rec.data.fsn_num == chk->rec.data.fsn_num) {
1000 * They sent a duplicate fsn number. This really
1001 * should not happen since the FSN is a TSN and it
1002 * should have been dropped earlier.
1004 sctp_abort_in_reasm(stcb, control, chk,
1006 SCTP_FROM_SCTP_INDATA + SCTP_LOC_5);
1010 if (inserted == 0) {
1011 /* Its at the end */
1012 asoc->size_on_reasm_queue += chk->send_size;
1013 sctp_ucount_incr(asoc->cnt_on_reasm_queue);
1014 control->top_fsn = chk->rec.data.fsn_num;
1015 TAILQ_INSERT_TAIL(&control->reasm, chk, sctp_next);
1020 sctp_deliver_reasm_check(struct sctp_tcb *stcb, struct sctp_association *asoc,
1021 struct sctp_stream_in *strm, int inp_read_lock_held)
1024 * Given a stream, strm, see if any of the SSN's on it that are
1025 * fragmented are ready to deliver. If so go ahead and place them on
1026 * the read queue. In so placing if we have hit the end, then we
1027 * need to remove them from the stream's queue.
1029 struct sctp_queued_to_read *control, *nctl = NULL;
1030 uint32_t next_to_del;
1034 if (stcb->sctp_socket) {
1035 pd_point = min(SCTP_SB_LIMIT_RCV(stcb->sctp_socket) >> SCTP_PARTIAL_DELIVERY_SHIFT,
1036 stcb->sctp_ep->partial_delivery_point);
1038 pd_point = stcb->sctp_ep->partial_delivery_point;
1040 control = TAILQ_FIRST(&strm->uno_inqueue);
1043 (asoc->idata_supported == 0)) {
1044 /* Special handling needed for "old" data format */
1045 if (sctp_handle_old_unordered_data(stcb, asoc, strm, control, pd_point, inp_read_lock_held)) {
1049 if (strm->pd_api_started) {
1050 /* Can't add more */
1054 SCTPDBG(SCTP_DEBUG_XXX, "Looking at control: %p e(%d) ssn: %u top_fsn: %u inc_fsn: %u -uo\n",
1055 control, control->end_added, control->sinfo_ssn, control->top_fsn, control->fsn_included);
1056 nctl = TAILQ_NEXT(control, next_instrm);
1057 if (control->end_added) {
1058 /* We just put the last bit on */
1059 if (control->on_strm_q) {
1061 if (control->on_strm_q != SCTP_ON_UNORDERED) {
1062 panic("Huh control: %p on_q: %d -- not unordered?",
1063 control, control->on_strm_q);
1066 SCTP_STAT_INCR_COUNTER64(sctps_reasmusrmsgs);
1067 TAILQ_REMOVE(&strm->uno_inqueue, control, next_instrm);
1068 control->on_strm_q = 0;
1070 if (control->on_read_q == 0) {
1071 sctp_add_to_readq(stcb->sctp_ep, stcb,
1073 &stcb->sctp_socket->so_rcv, control->end_added,
1074 inp_read_lock_held, SCTP_SO_NOT_LOCKED);
1077 /* Can we do a PD-API for this un-ordered guy? */
1078 if ((control->length >= pd_point) && (strm->pd_api_started == 0)) {
1079 strm->pd_api_started = 1;
1080 control->pdapi_started = 1;
1081 sctp_add_to_readq(stcb->sctp_ep, stcb,
1083 &stcb->sctp_socket->so_rcv, control->end_added,
1084 inp_read_lock_held, SCTP_SO_NOT_LOCKED);
1092 control = TAILQ_FIRST(&strm->inqueue);
1093 if (strm->pd_api_started) {
1094 /* Can't add more */
1097 if (control == NULL) {
1100 if (strm->last_sequence_delivered == control->sinfo_ssn) {
1102 * Ok the guy at the top was being partially delivered
1103 * completed, so we remove it. Note the pd_api flag was
1104 * taken off when the chunk was merged on in
1105 * sctp_queue_data_for_reasm below.
1107 nctl = TAILQ_NEXT(control, next_instrm);
1108 SCTPDBG(SCTP_DEBUG_XXX,
1109 "Looking at control: %p e(%d) ssn: %u top_fsn: %u inc_fsn: %u (lastdel: %u)- o\n",
1110 control, control->end_added, control->sinfo_ssn,
1111 control->top_fsn, control->fsn_included,
1112 strm->last_sequence_delivered);
1113 if (control->end_added) {
1114 if (control->on_strm_q) {
1116 if (control->on_strm_q != SCTP_ON_ORDERED) {
1117 panic("Huh control: %p on_q: %d -- not ordered?",
1118 control, control->on_strm_q);
1121 SCTP_STAT_INCR_COUNTER64(sctps_reasmusrmsgs);
1122 TAILQ_REMOVE(&strm->inqueue, control, next_instrm);
1123 control->on_strm_q = 0;
1125 if (strm->pd_api_started && control->pdapi_started) {
1126 control->pdapi_started = 0;
1127 strm->pd_api_started = 0;
1129 if (control->on_read_q == 0) {
1130 sctp_add_to_readq(stcb->sctp_ep, stcb,
1132 &stcb->sctp_socket->so_rcv, control->end_added,
1133 inp_read_lock_held, SCTP_SO_NOT_LOCKED);
1138 if (strm->pd_api_started) {
1140 * Can't add more must have gotten an un-ordered above being
1141 * partially delivered.
1146 next_to_del = strm->last_sequence_delivered + 1;
1148 SCTPDBG(SCTP_DEBUG_XXX,
1149 "Looking at control: %p e(%d) ssn: %u top_fsn: %u inc_fsn: %u (nxtdel: %u)- o\n",
1150 control, control->end_added, control->sinfo_ssn, control->top_fsn, control->fsn_included,
1152 nctl = TAILQ_NEXT(control, next_instrm);
1153 if ((control->sinfo_ssn == next_to_del) &&
1154 (control->first_frag_seen)) {
1157 /* Ok we can deliver it onto the stream. */
1158 if (control->end_added) {
1159 /* We are done with it afterwards */
1160 if (control->on_strm_q) {
1162 if (control->on_strm_q != SCTP_ON_ORDERED) {
1163 panic("Huh control: %p on_q: %d -- not ordered?",
1164 control, control->on_strm_q);
1167 SCTP_STAT_INCR_COUNTER64(sctps_reasmusrmsgs);
1168 TAILQ_REMOVE(&strm->inqueue, control, next_instrm);
1169 control->on_strm_q = 0;
1173 if (((control->sinfo_flags >> 8) & SCTP_DATA_NOT_FRAG) == SCTP_DATA_NOT_FRAG) {
1175 * A singleton now slipping through - mark
1176 * it non-revokable too
1178 sctp_mark_non_revokable(asoc, control->sinfo_tsn);
1179 } else if (control->end_added == 0) {
1181 * Check if we can defer adding until its
1184 if ((control->length < pd_point) || (strm->pd_api_started)) {
1186 * Don't need it or cannot add more
1187 * (one being delivered that way)
1192 done = (control->end_added) && (control->last_frag_seen);
1193 if (control->on_read_q == 0) {
1194 sctp_add_to_readq(stcb->sctp_ep, stcb,
1196 &stcb->sctp_socket->so_rcv, control->end_added,
1197 inp_read_lock_held, SCTP_SO_NOT_LOCKED);
1199 strm->last_sequence_delivered = next_to_del;
1204 /* We are now doing PD API */
1205 strm->pd_api_started = 1;
1206 control->pdapi_started = 1;
1216 sctp_add_chk_to_control(struct sctp_queued_to_read *control,
1217 struct sctp_stream_in *strm,
1218 struct sctp_tcb *stcb, struct sctp_association *asoc,
1219 struct sctp_tmit_chunk *chk, int hold_rlock)
1222 * Given a control and a chunk, merge the data from the chk onto the
1223 * control and free up the chunk resources.
1227 if (control->on_read_q && (hold_rlock == 0)) {
1229 * Its being pd-api'd so we must do some locks.
1231 SCTP_INP_READ_LOCK(stcb->sctp_ep);
1234 if (control->data == NULL) {
1235 control->data = chk->data;
1236 sctp_setup_tail_pointer(control);
1238 sctp_add_to_tail_pointer(control, chk->data);
1240 control->fsn_included = chk->rec.data.fsn_num;
1241 asoc->size_on_reasm_queue -= chk->send_size;
1242 sctp_ucount_decr(asoc->cnt_on_reasm_queue);
1243 sctp_mark_non_revokable(asoc, chk->rec.data.TSN_seq);
1245 if (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) {
1246 control->first_frag_seen = 1;
1248 if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) {
1250 if ((control->on_strm_q) && (control->on_read_q)) {
1251 if (control->pdapi_started) {
1252 control->pdapi_started = 0;
1253 strm->pd_api_started = 0;
1255 if (control->on_strm_q == SCTP_ON_UNORDERED) {
1257 TAILQ_REMOVE(&strm->uno_inqueue, control, next_instrm);
1258 control->on_strm_q = 0;
1259 } else if (control->on_strm_q == SCTP_ON_ORDERED) {
1261 TAILQ_REMOVE(&strm->inqueue, control, next_instrm);
1262 control->on_strm_q = 0;
1264 } else if (control->on_strm_q) {
1265 panic("Unknown state on ctrl: %p on_strm_q: %d", control,
1266 control->on_strm_q);
1270 control->end_added = 1;
1271 control->last_frag_seen = 1;
1274 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
1276 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
1280 * Dump onto the re-assembly queue, in its proper place. After dumping on the
1281 * queue, see if anthing can be delivered. If so pull it off (or as much as
1282 * we can. If we run out of space then we must dump what we can and set the
1283 * appropriate flag to say we queued what we could.
1286 sctp_queue_data_for_reasm(struct sctp_tcb *stcb, struct sctp_association *asoc,
1287 struct sctp_stream_in *strm,
1288 struct sctp_queued_to_read *control,
1289 struct sctp_tmit_chunk *chk,
1290 int created_control,
1291 int *abort_flag, uint32_t tsn)
1294 struct sctp_tmit_chunk *at, *nat;
1295 int do_wakeup, unordered;
1298 * For old un-ordered data chunks.
1300 if ((control->sinfo_flags >> 8) & SCTP_DATA_UNORDERED) {
1305 /* Must be added to the stream-in queue */
1306 if (created_control) {
1307 if (sctp_place_control_in_stream(strm, asoc, control)) {
1308 /* Duplicate SSN? */
1309 sctp_clean_up_control(stcb, control);
1310 sctp_abort_in_reasm(stcb, control, chk,
1312 SCTP_FROM_SCTP_INDATA + SCTP_LOC_6);
1315 if ((tsn == (asoc->cumulative_tsn + 1) && (asoc->idata_supported == 0))) {
1317 * Ok we created this control and now lets validate
1318 * that its legal i.e. there is a B bit set, if not
1319 * and we have up to the cum-ack then its invalid.
1321 if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0) {
1322 sctp_abort_in_reasm(stcb, control, chk,
1324 SCTP_FROM_SCTP_INDATA + SCTP_LOC_7);
1329 if ((asoc->idata_supported == 0) && (unordered == 1)) {
1330 sctp_inject_old_unordered_data(stcb, asoc, control, chk, abort_flag);
1334 * Ok we must queue the chunk into the reasembly portion: o if its
1335 * the first it goes to the control mbuf. o if its not first but the
1336 * next in sequence it goes to the control, and each succeeding one
1337 * in order also goes. o if its not in order we place it on the list
1340 if (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) {
1341 /* Its the very first one. */
1342 SCTPDBG(SCTP_DEBUG_XXX,
1343 "chunk is a first fsn: %u becomes fsn_included\n",
1344 chk->rec.data.fsn_num);
1345 if (control->first_frag_seen) {
1347 * Error on senders part, they either sent us two
1348 * data chunks with FIRST, or they sent two
1349 * un-ordered chunks that were fragmented at the
1350 * same time in the same stream.
1352 sctp_abort_in_reasm(stcb, control, chk,
1354 SCTP_FROM_SCTP_INDATA + SCTP_LOC_8);
1357 control->first_frag_seen = 1;
1358 control->fsn_included = chk->rec.data.fsn_num;
1359 control->data = chk->data;
1360 sctp_mark_non_revokable(asoc, chk->rec.data.TSN_seq);
1362 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
1363 sctp_setup_tail_pointer(control);
1365 /* Place the chunk in our list */
1368 if (control->last_frag_seen == 0) {
1369 /* Still willing to raise highest FSN seen */
1370 if (SCTP_TSN_GT(chk->rec.data.fsn_num, control->top_fsn)) {
1371 SCTPDBG(SCTP_DEBUG_XXX,
1372 "We have a new top_fsn: %u\n",
1373 chk->rec.data.fsn_num);
1374 control->top_fsn = chk->rec.data.fsn_num;
1376 if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) {
1377 SCTPDBG(SCTP_DEBUG_XXX,
1378 "The last fsn is now in place fsn: %u\n",
1379 chk->rec.data.fsn_num);
1380 control->last_frag_seen = 1;
1382 if (asoc->idata_supported || control->first_frag_seen) {
1384 * For IDATA we always check since we know
1385 * that the first fragment is 0. For old
1386 * DATA we have to receive the first before
1387 * we know the first FSN (which is the TSN).
1389 if (SCTP_TSN_GE(control->fsn_included, chk->rec.data.fsn_num)) {
1391 * We have already delivered up to
1394 sctp_abort_in_reasm(stcb, control, chk,
1396 SCTP_FROM_SCTP_INDATA + SCTP_LOC_9);
1401 if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) {
1402 /* Second last? huh? */
1403 SCTPDBG(SCTP_DEBUG_XXX,
1404 "Duplicate last fsn: %u (top: %u) -- abort\n",
1405 chk->rec.data.fsn_num, control->top_fsn);
1406 sctp_abort_in_reasm(stcb, control,
1408 SCTP_FROM_SCTP_INDATA + SCTP_LOC_10);
1411 if (asoc->idata_supported || control->first_frag_seen) {
1413 * For IDATA we always check since we know
1414 * that the first fragment is 0. For old
1415 * DATA we have to receive the first before
1416 * we know the first FSN (which is the TSN).
1419 if (SCTP_TSN_GE(control->fsn_included, chk->rec.data.fsn_num)) {
1421 * We have already delivered up to
1424 SCTPDBG(SCTP_DEBUG_XXX,
1425 "New fsn: %u is already seen in included_fsn: %u -- abort\n",
1426 chk->rec.data.fsn_num, control->fsn_included);
1427 sctp_abort_in_reasm(stcb, control, chk,
1429 SCTP_FROM_SCTP_INDATA + SCTP_LOC_11);
1434 * validate not beyond top FSN if we have seen last
1437 if (SCTP_TSN_GT(chk->rec.data.fsn_num, control->top_fsn)) {
1438 SCTPDBG(SCTP_DEBUG_XXX,
1439 "New fsn: %u is beyond or at top_fsn: %u -- abort\n",
1440 chk->rec.data.fsn_num,
1442 sctp_abort_in_reasm(stcb, control, chk,
1444 SCTP_FROM_SCTP_INDATA + SCTP_LOC_12);
1449 * If we reach here, we need to place the new chunk in the
1450 * reassembly for this control.
1452 SCTPDBG(SCTP_DEBUG_XXX,
1453 "chunk is a not first fsn: %u needs to be inserted\n",
1454 chk->rec.data.fsn_num);
1455 TAILQ_FOREACH(at, &control->reasm, sctp_next) {
1456 if (SCTP_TSN_GT(at->rec.data.fsn_num, chk->rec.data.fsn_num)) {
1458 * This one in queue is bigger than the new
1459 * one, insert the new one before at.
1461 SCTPDBG(SCTP_DEBUG_XXX,
1462 "Insert it before fsn: %u\n",
1463 at->rec.data.fsn_num);
1464 asoc->size_on_reasm_queue += chk->send_size;
1465 sctp_ucount_incr(asoc->cnt_on_reasm_queue);
1466 TAILQ_INSERT_BEFORE(at, chk, sctp_next);
1469 } else if (at->rec.data.fsn_num == chk->rec.data.fsn_num) {
1471 * Gak, He sent me a duplicate str seq
1475 * foo bar, I guess I will just free this
1476 * new guy, should we abort too? FIX ME
1477 * MAYBE? Or it COULD be that the SSN's have
1478 * wrapped. Maybe I should compare to TSN
1479 * somehow... sigh for now just blow away
1482 SCTPDBG(SCTP_DEBUG_XXX,
1483 "Duplicate to fsn: %u -- abort\n",
1484 at->rec.data.fsn_num);
1485 sctp_abort_in_reasm(stcb, control,
1487 SCTP_FROM_SCTP_INDATA + SCTP_LOC_13);
1491 if (inserted == 0) {
1492 /* Goes on the end */
1493 SCTPDBG(SCTP_DEBUG_XXX, "Inserting at tail of list fsn: %u\n",
1494 chk->rec.data.fsn_num);
1495 asoc->size_on_reasm_queue += chk->send_size;
1496 sctp_ucount_incr(asoc->cnt_on_reasm_queue);
1497 TAILQ_INSERT_TAIL(&control->reasm, chk, sctp_next);
1501 * Ok lets see if we can suck any up into the control structure that
1502 * are in seq if it makes sense.
1506 * If the first fragment has not been seen there is no sense in
1509 if (control->first_frag_seen) {
1510 next_fsn = control->fsn_included + 1;
1511 TAILQ_FOREACH_SAFE(at, &control->reasm, sctp_next, nat) {
1512 if (at->rec.data.fsn_num == next_fsn) {
1513 /* We can add this one now to the control */
1514 SCTPDBG(SCTP_DEBUG_XXX,
1515 "Adding more to control: %p at: %p fsn: %u next_fsn: %u included: %u\n",
1517 at->rec.data.fsn_num,
1518 next_fsn, control->fsn_included);
1519 TAILQ_REMOVE(&control->reasm, at, sctp_next);
1520 sctp_add_chk_to_control(control, strm, stcb, asoc, at, SCTP_READ_LOCK_NOT_HELD);
1521 if (control->on_read_q) {
1525 if (control->end_added && control->pdapi_started) {
1526 if (strm->pd_api_started) {
1527 strm->pd_api_started = 0;
1528 control->pdapi_started = 0;
1530 if (control->on_read_q == 0) {
1531 sctp_add_to_readq(stcb->sctp_ep, stcb,
1533 &stcb->sctp_socket->so_rcv, control->end_added,
1534 SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED);
1545 /* Need to wakeup the reader */
1546 sctp_wakeup_the_read_socket(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1550 static struct sctp_queued_to_read *
1551 sctp_find_reasm_entry(struct sctp_stream_in *strm, uint32_t msg_id, int ordered, int old)
1553 struct sctp_queued_to_read *control;
1556 TAILQ_FOREACH(control, &strm->inqueue, next_instrm) {
1557 if (control->msg_id == msg_id) {
1563 control = TAILQ_FIRST(&strm->uno_inqueue);
1566 TAILQ_FOREACH(control, &strm->uno_inqueue, next_instrm) {
1567 if (control->msg_id == msg_id) {
1576 sctp_process_a_data_chunk(struct sctp_tcb *stcb, struct sctp_association *asoc,
1577 struct mbuf **m, int offset, int chk_length,
1578 struct sctp_nets *net, uint32_t * high_tsn, int *abort_flag,
1579 int *break_flag, int last_chunk, uint8_t chtype)
1581 /* Process a data chunk */
1582 /* struct sctp_tmit_chunk *chk; */
1583 struct sctp_data_chunk *ch;
1584 struct sctp_idata_chunk *nch, chunk_buf;
1585 struct sctp_tmit_chunk *chk;
1586 uint32_t tsn, fsn, gap, msg_id;
1589 int need_reasm_check = 0;
1591 struct mbuf *op_err;
1592 char msg[SCTP_DIAG_INFO_LEN];
1593 struct sctp_queued_to_read *control = NULL;
1594 uint32_t protocol_id;
1595 uint8_t chunk_flags;
1596 struct sctp_stream_reset_list *liste;
1597 struct sctp_stream_in *strm;
1600 int created_control = 0;
1604 if (chtype == SCTP_IDATA) {
1605 nch = (struct sctp_idata_chunk *)sctp_m_getptr(*m, offset,
1606 sizeof(struct sctp_idata_chunk), (uint8_t *) & chunk_buf);
1607 ch = (struct sctp_data_chunk *)nch;
1608 clen = sizeof(struct sctp_idata_chunk);
1609 tsn = ntohl(ch->dp.tsn);
1610 msg_id = ntohl(nch->dp.msg_id);
1611 protocol_id = nch->dp.ppid_fsn.protocol_id;
1612 if (ch->ch.chunk_flags & SCTP_DATA_FIRST_FRAG)
1615 fsn = ntohl(nch->dp.ppid_fsn.fsn);
1618 ch = (struct sctp_data_chunk *)sctp_m_getptr(*m, offset,
1619 sizeof(struct sctp_data_chunk), (uint8_t *) & chunk_buf);
1620 tsn = ntohl(ch->dp.tsn);
1621 protocol_id = ch->dp.protocol_id;
1622 clen = sizeof(struct sctp_data_chunk);
1624 msg_id = (uint32_t) (ntohs(ch->dp.stream_sequence));
1628 chunk_flags = ch->ch.chunk_flags;
1629 if ((size_t)chk_length == clen) {
1631 * Need to send an abort since we had a empty data chunk.
1633 op_err = sctp_generate_no_user_data_cause(ch->dp.tsn);
1634 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_14;
1635 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
1639 if ((chunk_flags & SCTP_DATA_SACK_IMMEDIATELY) == SCTP_DATA_SACK_IMMEDIATELY) {
1640 asoc->send_sack = 1;
1642 ordered = ((chunk_flags & SCTP_DATA_UNORDERED) == 0);
1643 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
1644 sctp_log_map(tsn, asoc->cumulative_tsn, asoc->highest_tsn_inside_map, SCTP_MAP_TSN_ENTERS);
1649 SCTP_LTRACE_CHK(stcb->sctp_ep, stcb, ch->ch.chunk_type, tsn);
1650 if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
1651 /* It is a duplicate */
1652 SCTP_STAT_INCR(sctps_recvdupdata);
1653 if (asoc->numduptsns < SCTP_MAX_DUP_TSNS) {
1654 /* Record a dup for the next outbound sack */
1655 asoc->dup_tsns[asoc->numduptsns] = tsn;
1658 asoc->send_sack = 1;
1661 /* Calculate the number of TSN's between the base and this TSN */
1662 SCTP_CALC_TSN_TO_GAP(gap, tsn, asoc->mapping_array_base_tsn);
1663 if (gap >= (SCTP_MAPPING_ARRAY << 3)) {
1664 /* Can't hold the bit in the mapping at max array, toss it */
1667 if (gap >= (uint32_t) (asoc->mapping_array_size << 3)) {
1668 SCTP_TCB_LOCK_ASSERT(stcb);
1669 if (sctp_expand_mapping_array(asoc, gap)) {
1670 /* Can't expand, drop it */
1674 if (SCTP_TSN_GT(tsn, *high_tsn)) {
1677 /* See if we have received this one already */
1678 if (SCTP_IS_TSN_PRESENT(asoc->mapping_array, gap) ||
1679 SCTP_IS_TSN_PRESENT(asoc->nr_mapping_array, gap)) {
1680 SCTP_STAT_INCR(sctps_recvdupdata);
1681 if (asoc->numduptsns < SCTP_MAX_DUP_TSNS) {
1682 /* Record a dup for the next outbound sack */
1683 asoc->dup_tsns[asoc->numduptsns] = tsn;
1686 asoc->send_sack = 1;
1690 * Check to see about the GONE flag, duplicates would cause a sack
1691 * to be sent up above
1693 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
1694 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
1695 (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET))) {
1697 * wait a minute, this guy is gone, there is no longer a
1698 * receiver. Send peer an ABORT!
1700 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
1701 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
1706 * Now before going further we see if there is room. If NOT then we
1707 * MAY let one through only IF this TSN is the one we are waiting
1708 * for on a partial delivery API.
1711 /* Is the stream valid? */
1712 strmno = ntohs(ch->dp.stream_id);
1714 if (strmno >= asoc->streamincnt) {
1715 struct sctp_error_invalid_stream *cause;
1717 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_invalid_stream),
1718 0, M_NOWAIT, 1, MT_DATA);
1719 if (op_err != NULL) {
1720 /* add some space up front so prepend will work well */
1721 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
1722 cause = mtod(op_err, struct sctp_error_invalid_stream *);
1724 * Error causes are just param's and this one has
1725 * two back to back phdr, one with the error type
1726 * and size, the other with the streamid and a rsvd
1728 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_invalid_stream);
1729 cause->cause.code = htons(SCTP_CAUSE_INVALID_STREAM);
1730 cause->cause.length = htons(sizeof(struct sctp_error_invalid_stream));
1731 cause->stream_id = ch->dp.stream_id;
1732 cause->reserved = htons(0);
1733 sctp_queue_op_err(stcb, op_err);
1735 SCTP_STAT_INCR(sctps_badsid);
1736 SCTP_TCB_LOCK_ASSERT(stcb);
1737 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap);
1738 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) {
1739 asoc->highest_tsn_inside_nr_map = tsn;
1741 if (tsn == (asoc->cumulative_tsn + 1)) {
1742 /* Update cum-ack */
1743 asoc->cumulative_tsn = tsn;
1747 strm = &asoc->strmin[strmno];
1749 * If its a fragmented message, lets see if we can find the control
1750 * on the reassembly queues.
1752 if ((chtype == SCTP_IDATA) &&
1753 ((chunk_flags & SCTP_DATA_FIRST_FRAG) == 0) &&
1756 * The first *must* be fsn 0, and other (middle/end) pieces
1757 * can *not* be fsn 0. XXX: This can happen in case of a
1758 * wrap around. Ignore is for now.
1760 snprintf(msg, sizeof(msg), "FSN zero for MID=%8.8x, but flags=%2.2x",
1761 msg_id, chunk_flags);
1764 control = sctp_find_reasm_entry(strm, msg_id, ordered, old_data);
1765 SCTPDBG(SCTP_DEBUG_XXX, "chunk_flags:0x%x look for control on queues %p\n",
1766 chunk_flags, control);
1767 if ((chunk_flags & SCTP_DATA_NOT_FRAG) != SCTP_DATA_NOT_FRAG) {
1768 /* See if we can find the re-assembly entity */
1769 if (control != NULL) {
1770 /* We found something, does it belong? */
1771 if (ordered && (msg_id != control->sinfo_ssn)) {
1772 snprintf(msg, sizeof(msg), "Reassembly problem (MID=%8.8x)", msg_id);
1774 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
1775 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_15;
1776 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
1780 if (ordered && ((control->sinfo_flags >> 8) & SCTP_DATA_UNORDERED)) {
1782 * We can't have a switched order with an
1785 snprintf(msg, sizeof(msg), "All fragments of a user message must be ordered or unordered (TSN=%8.8x)",
1789 if (!ordered && (((control->sinfo_flags >> 8) & SCTP_DATA_UNORDERED) == 0)) {
1791 * We can't have a switched unordered with a
1794 snprintf(msg, sizeof(msg), "All fragments of a user message must be ordered or unordered (TSN=%8.8x)",
1801 * Its a complete segment. Lets validate we don't have a
1802 * re-assembly going on with the same Stream/Seq (for
1803 * ordered) or in the same Stream for unordered.
1805 if (control != NULL) {
1806 if (ordered || (old_data == 0)) {
1807 SCTPDBG(SCTP_DEBUG_XXX, "chunk_flags: 0x%x dup detected on msg_id: %u\n",
1808 chunk_flags, msg_id);
1809 snprintf(msg, sizeof(msg), "Duplicate MID=%8.8x detected.", msg_id);
1812 if ((tsn == control->fsn_included + 1) &&
1813 (control->end_added == 0)) {
1814 snprintf(msg, sizeof(msg), "Illegal message sequence, missing end for MID: %8.8x", control->fsn_included);
1822 /* now do the tests */
1823 if (((asoc->cnt_on_all_streams +
1824 asoc->cnt_on_reasm_queue +
1825 asoc->cnt_msg_on_sb) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue)) ||
1826 (((int)asoc->my_rwnd) <= 0)) {
1828 * When we have NO room in the rwnd we check to make sure
1829 * the reader is doing its job...
1831 if (stcb->sctp_socket->so_rcv.sb_cc) {
1832 /* some to read, wake-up */
1833 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1836 so = SCTP_INP_SO(stcb->sctp_ep);
1837 atomic_add_int(&stcb->asoc.refcnt, 1);
1838 SCTP_TCB_UNLOCK(stcb);
1839 SCTP_SOCKET_LOCK(so, 1);
1840 SCTP_TCB_LOCK(stcb);
1841 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1842 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1843 /* assoc was freed while we were unlocked */
1844 SCTP_SOCKET_UNLOCK(so, 1);
1848 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
1849 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1850 SCTP_SOCKET_UNLOCK(so, 1);
1853 /* now is it in the mapping array of what we have accepted? */
1855 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_map) &&
1856 SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) {
1857 /* Nope not in the valid range dump it */
1859 sctp_set_rwnd(stcb, asoc);
1860 if ((asoc->cnt_on_all_streams +
1861 asoc->cnt_on_reasm_queue +
1862 asoc->cnt_msg_on_sb) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue)) {
1863 SCTP_STAT_INCR(sctps_datadropchklmt);
1865 SCTP_STAT_INCR(sctps_datadroprwnd);
1871 if (control == NULL) {
1874 if (SCTP_TSN_GT(fsn, control->top_fsn)) {
1879 #ifdef SCTP_ASOCLOG_OF_TSNS
1880 SCTP_TCB_LOCK_ASSERT(stcb);
1881 if (asoc->tsn_in_at >= SCTP_TSN_LOG_SIZE) {
1882 asoc->tsn_in_at = 0;
1883 asoc->tsn_in_wrapped = 1;
1885 asoc->in_tsnlog[asoc->tsn_in_at].tsn = tsn;
1886 asoc->in_tsnlog[asoc->tsn_in_at].strm = strmno;
1887 asoc->in_tsnlog[asoc->tsn_in_at].seq = msg_id;
1888 asoc->in_tsnlog[asoc->tsn_in_at].sz = chk_length;
1889 asoc->in_tsnlog[asoc->tsn_in_at].flgs = chunk_flags;
1890 asoc->in_tsnlog[asoc->tsn_in_at].stcb = (void *)stcb;
1891 asoc->in_tsnlog[asoc->tsn_in_at].in_pos = asoc->tsn_in_at;
1892 asoc->in_tsnlog[asoc->tsn_in_at].in_out = 1;
1896 * Before we continue lets validate that we are not being fooled by
1897 * an evil attacker. We can only have Nk chunks based on our TSN
1898 * spread allowed by the mapping array N * 8 bits, so there is no
1899 * way our stream sequence numbers could have wrapped. We of course
1900 * only validate the FIRST fragment so the bit must be set.
1902 if ((chunk_flags & SCTP_DATA_FIRST_FRAG) &&
1903 (TAILQ_EMPTY(&asoc->resetHead)) &&
1904 (chunk_flags & SCTP_DATA_UNORDERED) == 0 &&
1905 SCTP_MSGID_GE(old_data, asoc->strmin[strmno].last_sequence_delivered, msg_id)) {
1906 /* The incoming sseq is behind where we last delivered? */
1907 SCTPDBG(SCTP_DEBUG_INDATA1, "EVIL/Broken-Dup S-SEQ: %u delivered: %u from peer, Abort!\n",
1908 msg_id, asoc->strmin[strmno].last_sequence_delivered);
1910 snprintf(msg, sizeof(msg), "Delivered SSN=%4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
1911 asoc->strmin[strmno].last_sequence_delivered,
1912 tsn, strmno, msg_id);
1913 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
1914 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_16;
1915 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
1919 /************************************
1920 * From here down we may find ch-> invalid
1921 * so its a good idea NOT to use it.
1922 *************************************/
1924 the_len = (chk_length - sizeof(struct sctp_idata_chunk));
1926 the_len = (chk_length - sizeof(struct sctp_data_chunk));
1928 if (last_chunk == 0) {
1930 dmbuf = SCTP_M_COPYM(*m,
1931 (offset + sizeof(struct sctp_idata_chunk)),
1934 dmbuf = SCTP_M_COPYM(*m,
1935 (offset + sizeof(struct sctp_data_chunk)),
1938 #ifdef SCTP_MBUF_LOGGING
1939 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
1940 sctp_log_mbc(dmbuf, SCTP_MBUF_ICOPY);
1944 /* We can steal the last chunk */
1948 /* lop off the top part */
1950 m_adj(dmbuf, (offset + sizeof(struct sctp_idata_chunk)));
1952 m_adj(dmbuf, (offset + sizeof(struct sctp_data_chunk)));
1954 if (SCTP_BUF_NEXT(dmbuf) == NULL) {
1955 l_len = SCTP_BUF_LEN(dmbuf);
1958 * need to count up the size hopefully does not hit
1964 for (lat = dmbuf; lat; lat = SCTP_BUF_NEXT(lat)) {
1965 l_len += SCTP_BUF_LEN(lat);
1968 if (l_len > the_len) {
1969 /* Trim the end round bytes off too */
1970 m_adj(dmbuf, -(l_len - the_len));
1973 if (dmbuf == NULL) {
1974 SCTP_STAT_INCR(sctps_nomem);
1978 * Now no matter what we need a control, get one if we don't have
1979 * one (we may have gotten it above when we found the message was
1982 if (control == NULL) {
1983 sctp_alloc_a_readq(stcb, control);
1984 sctp_build_readq_entry_mac(control, stcb, asoc->context, net, tsn,
1989 if (control == NULL) {
1990 SCTP_STAT_INCR(sctps_nomem);
1993 if ((chunk_flags & SCTP_DATA_NOT_FRAG) == SCTP_DATA_NOT_FRAG) {
1994 control->data = dmbuf;
1995 control->tail_mbuf = NULL;
1996 control->end_added = control->last_frag_seen = control->first_frag_seen = 1;
1997 control->top_fsn = control->fsn_included = fsn;
1999 created_control = 1;
2001 SCTPDBG(SCTP_DEBUG_XXX, "chunk_flags: 0x%x ordered: %d msgid: %u control: %p\n",
2002 chunk_flags, ordered, msg_id, control);
2003 if ((chunk_flags & SCTP_DATA_NOT_FRAG) == SCTP_DATA_NOT_FRAG &&
2004 TAILQ_EMPTY(&asoc->resetHead) &&
2006 ((uint16_t) (asoc->strmin[strmno].last_sequence_delivered + 1) == msg_id &&
2007 TAILQ_EMPTY(&asoc->strmin[strmno].inqueue)))) {
2008 /* Candidate for express delivery */
2010 * Its not fragmented, No PD-API is up, Nothing in the
2011 * delivery queue, Its un-ordered OR ordered and the next to
2012 * deliver AND nothing else is stuck on the stream queue,
2013 * And there is room for it in the socket buffer. Lets just
2014 * stuff it up the buffer....
2016 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap);
2017 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) {
2018 asoc->highest_tsn_inside_nr_map = tsn;
2020 SCTPDBG(SCTP_DEBUG_XXX, "Injecting control: %p to be read (msg_id: %u)\n",
2023 sctp_add_to_readq(stcb->sctp_ep, stcb,
2024 control, &stcb->sctp_socket->so_rcv,
2025 1, SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED);
2027 if ((chunk_flags & SCTP_DATA_UNORDERED) == 0) {
2028 /* for ordered, bump what we delivered */
2029 strm->last_sequence_delivered++;
2031 SCTP_STAT_INCR(sctps_recvexpress);
2032 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
2033 sctp_log_strm_del_alt(stcb, tsn, msg_id, strmno,
2034 SCTP_STR_LOG_FROM_EXPRS_DEL);
2037 goto finish_express_del;
2039 /* Now will we need a chunk too? */
2040 if ((chunk_flags & SCTP_DATA_NOT_FRAG) != SCTP_DATA_NOT_FRAG) {
2041 sctp_alloc_a_chunk(stcb, chk);
2043 /* No memory so we drop the chunk */
2044 SCTP_STAT_INCR(sctps_nomem);
2045 if (last_chunk == 0) {
2046 /* we copied it, free the copy */
2047 sctp_m_freem(dmbuf);
2051 chk->rec.data.TSN_seq = tsn;
2052 chk->no_fr_allowed = 0;
2053 chk->rec.data.fsn_num = fsn;
2054 chk->rec.data.stream_seq = msg_id;
2055 chk->rec.data.stream_number = strmno;
2056 chk->rec.data.payloadtype = protocol_id;
2057 chk->rec.data.context = stcb->asoc.context;
2058 chk->rec.data.doing_fast_retransmit = 0;
2059 chk->rec.data.rcv_flags = chunk_flags;
2061 chk->send_size = the_len;
2063 SCTPDBG(SCTP_DEBUG_XXX, "Building ck: %p for control: %p to be read (msg_id: %u)\n",
2066 atomic_add_int(&net->ref_count, 1);
2069 /* Set the appropriate TSN mark */
2070 if (SCTP_BASE_SYSCTL(sctp_do_drain) == 0) {
2071 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap);
2072 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) {
2073 asoc->highest_tsn_inside_nr_map = tsn;
2076 SCTP_SET_TSN_PRESENT(asoc->mapping_array, gap);
2077 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_map)) {
2078 asoc->highest_tsn_inside_map = tsn;
2081 /* Now is it complete (i.e. not fragmented)? */
2082 if ((chunk_flags & SCTP_DATA_NOT_FRAG) == SCTP_DATA_NOT_FRAG) {
2084 * Special check for when streams are resetting. We could be
2085 * more smart about this and check the actual stream to see
2086 * if it is not being reset.. that way we would not create a
2087 * HOLB when amongst streams being reset and those not being
2091 if (((liste = TAILQ_FIRST(&asoc->resetHead)) != NULL) &&
2092 SCTP_TSN_GT(tsn, liste->tsn)) {
2094 * yep its past where we need to reset... go ahead
2097 if (TAILQ_EMPTY(&asoc->pending_reply_queue)) {
2099 TAILQ_INSERT_TAIL(&asoc->pending_reply_queue, control, next);
2101 struct sctp_queued_to_read *ctlOn, *nctlOn;
2102 unsigned char inserted = 0;
2104 TAILQ_FOREACH_SAFE(ctlOn, &asoc->pending_reply_queue, next, nctlOn) {
2105 if (SCTP_TSN_GT(control->sinfo_tsn, ctlOn->sinfo_tsn)) {
2110 TAILQ_INSERT_BEFORE(ctlOn, control, next);
2115 if (inserted == 0) {
2117 * must be put at end, use prevP
2118 * (all setup from loop) to setup
2121 TAILQ_INSERT_TAIL(&asoc->pending_reply_queue, control, next);
2124 goto finish_express_del;
2126 if (chunk_flags & SCTP_DATA_UNORDERED) {
2127 /* queue directly into socket buffer */
2128 SCTPDBG(SCTP_DEBUG_XXX, "Unordered data to be read control: %p msg_id: %u\n",
2130 sctp_mark_non_revokable(asoc, control->sinfo_tsn);
2131 sctp_add_to_readq(stcb->sctp_ep, stcb,
2133 &stcb->sctp_socket->so_rcv, 1,
2134 SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED);
2137 SCTPDBG(SCTP_DEBUG_XXX, "Queue control: %p for reordering msg_id: %u\n", control,
2139 sctp_queue_data_to_stream(stcb, strm, asoc, control, abort_flag, &need_reasm_check);
2147 goto finish_express_del;
2149 /* If we reach here its a reassembly */
2150 need_reasm_check = 1;
2151 SCTPDBG(SCTP_DEBUG_XXX,
2152 "Queue data to stream for reasm control: %p msg_id: %u\n",
2154 sctp_queue_data_for_reasm(stcb, asoc, strm, control, chk, created_control, abort_flag, tsn);
2157 * the assoc is now gone and chk was put onto the reasm
2158 * queue, which has all been freed.
2166 /* Here we tidy up things */
2167 if (tsn == (asoc->cumulative_tsn + 1)) {
2168 /* Update cum-ack */
2169 asoc->cumulative_tsn = tsn;
2175 SCTP_STAT_INCR_COUNTER64(sctps_inorderchunks);
2177 SCTP_STAT_INCR_COUNTER64(sctps_inunorderchunks);
2179 SCTP_STAT_INCR(sctps_recvdata);
2180 /* Set it present please */
2181 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
2182 sctp_log_strm_del_alt(stcb, tsn, msg_id, strmno, SCTP_STR_LOG_FROM_MARK_TSN);
2184 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
2185 sctp_log_map(asoc->mapping_array_base_tsn, asoc->cumulative_tsn,
2186 asoc->highest_tsn_inside_map, SCTP_MAP_PREPARE_SLIDE);
2188 /* check the special flag for stream resets */
2189 if (((liste = TAILQ_FIRST(&asoc->resetHead)) != NULL) &&
2190 SCTP_TSN_GE(asoc->cumulative_tsn, liste->tsn)) {
2192 * we have finished working through the backlogged TSN's now
2193 * time to reset streams. 1: call reset function. 2: free
2194 * pending_reply space 3: distribute any chunks in
2195 * pending_reply_queue.
2197 struct sctp_queued_to_read *ctl, *nctl;
2199 sctp_reset_in_stream(stcb, liste->number_entries, liste->list_of_streams);
2200 TAILQ_REMOVE(&asoc->resetHead, liste, next_resp);
2201 sctp_send_deferred_reset_response(stcb, liste, SCTP_STREAM_RESET_RESULT_PERFORMED);
2202 SCTP_FREE(liste, SCTP_M_STRESET);
2203 /* sa_ignore FREED_MEMORY */
2204 liste = TAILQ_FIRST(&asoc->resetHead);
2205 if (TAILQ_EMPTY(&asoc->resetHead)) {
2206 /* All can be removed */
2207 TAILQ_FOREACH_SAFE(ctl, &asoc->pending_reply_queue, next, nctl) {
2208 TAILQ_REMOVE(&asoc->pending_reply_queue, ctl, next);
2209 sctp_queue_data_to_stream(stcb, strm, asoc, ctl, abort_flag, &need_reasm_check);
2215 TAILQ_FOREACH_SAFE(ctl, &asoc->pending_reply_queue, next, nctl) {
2216 if (SCTP_TSN_GT(ctl->sinfo_tsn, liste->tsn)) {
2220 * if ctl->sinfo_tsn is <= liste->tsn we can
2221 * process it which is the NOT of
2222 * ctl->sinfo_tsn > liste->tsn
2224 TAILQ_REMOVE(&asoc->pending_reply_queue, ctl, next);
2225 sctp_queue_data_to_stream(stcb, strm, asoc, ctl, abort_flag, &need_reasm_check);
2232 * Now service re-assembly to pick up anything that has been
2233 * held on reassembly queue?
2235 (void)sctp_deliver_reasm_check(stcb, asoc, strm, SCTP_READ_LOCK_NOT_HELD);
2236 need_reasm_check = 0;
2238 if (need_reasm_check) {
2239 /* Another one waits ? */
2240 (void)sctp_deliver_reasm_check(stcb, asoc, strm, SCTP_READ_LOCK_NOT_HELD);
2245 static const int8_t sctp_map_lookup_tab[256] = {
2246 0, 1, 0, 2, 0, 1, 0, 3,
2247 0, 1, 0, 2, 0, 1, 0, 4,
2248 0, 1, 0, 2, 0, 1, 0, 3,
2249 0, 1, 0, 2, 0, 1, 0, 5,
2250 0, 1, 0, 2, 0, 1, 0, 3,
2251 0, 1, 0, 2, 0, 1, 0, 4,
2252 0, 1, 0, 2, 0, 1, 0, 3,
2253 0, 1, 0, 2, 0, 1, 0, 6,
2254 0, 1, 0, 2, 0, 1, 0, 3,
2255 0, 1, 0, 2, 0, 1, 0, 4,
2256 0, 1, 0, 2, 0, 1, 0, 3,
2257 0, 1, 0, 2, 0, 1, 0, 5,
2258 0, 1, 0, 2, 0, 1, 0, 3,
2259 0, 1, 0, 2, 0, 1, 0, 4,
2260 0, 1, 0, 2, 0, 1, 0, 3,
2261 0, 1, 0, 2, 0, 1, 0, 7,
2262 0, 1, 0, 2, 0, 1, 0, 3,
2263 0, 1, 0, 2, 0, 1, 0, 4,
2264 0, 1, 0, 2, 0, 1, 0, 3,
2265 0, 1, 0, 2, 0, 1, 0, 5,
2266 0, 1, 0, 2, 0, 1, 0, 3,
2267 0, 1, 0, 2, 0, 1, 0, 4,
2268 0, 1, 0, 2, 0, 1, 0, 3,
2269 0, 1, 0, 2, 0, 1, 0, 6,
2270 0, 1, 0, 2, 0, 1, 0, 3,
2271 0, 1, 0, 2, 0, 1, 0, 4,
2272 0, 1, 0, 2, 0, 1, 0, 3,
2273 0, 1, 0, 2, 0, 1, 0, 5,
2274 0, 1, 0, 2, 0, 1, 0, 3,
2275 0, 1, 0, 2, 0, 1, 0, 4,
2276 0, 1, 0, 2, 0, 1, 0, 3,
2277 0, 1, 0, 2, 0, 1, 0, 8
2282 sctp_slide_mapping_arrays(struct sctp_tcb *stcb)
2285 * Now we also need to check the mapping array in a couple of ways.
2286 * 1) Did we move the cum-ack point?
2288 * When you first glance at this you might think that all entries that
2289 * make up the position of the cum-ack would be in the nr-mapping
2290 * array only.. i.e. things up to the cum-ack are always
2291 * deliverable. Thats true with one exception, when its a fragmented
2292 * message we may not deliver the data until some threshold (or all
2293 * of it) is in place. So we must OR the nr_mapping_array and
2294 * mapping_array to get a true picture of the cum-ack.
2296 struct sctp_association *asoc;
2299 int slide_from, slide_end, lgap, distance;
2300 uint32_t old_cumack, old_base, old_highest, highest_tsn;
2304 old_cumack = asoc->cumulative_tsn;
2305 old_base = asoc->mapping_array_base_tsn;
2306 old_highest = asoc->highest_tsn_inside_map;
2308 * We could probably improve this a small bit by calculating the
2309 * offset of the current cum-ack as the starting point.
2312 for (slide_from = 0; slide_from < stcb->asoc.mapping_array_size; slide_from++) {
2313 val = asoc->nr_mapping_array[slide_from] | asoc->mapping_array[slide_from];
2317 /* there is a 0 bit */
2318 at += sctp_map_lookup_tab[val];
2322 asoc->cumulative_tsn = asoc->mapping_array_base_tsn + (at - 1);
2324 if (SCTP_TSN_GT(asoc->cumulative_tsn, asoc->highest_tsn_inside_map) &&
2325 SCTP_TSN_GT(asoc->cumulative_tsn, asoc->highest_tsn_inside_nr_map)) {
2327 panic("huh, cumack 0x%x greater than high-tsn 0x%x in map",
2328 asoc->cumulative_tsn, asoc->highest_tsn_inside_map);
2330 SCTP_PRINTF("huh, cumack 0x%x greater than high-tsn 0x%x in map - should panic?\n",
2331 asoc->cumulative_tsn, asoc->highest_tsn_inside_map);
2332 sctp_print_mapping_array(asoc);
2333 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
2334 sctp_log_map(0, 6, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
2336 asoc->highest_tsn_inside_map = asoc->cumulative_tsn;
2337 asoc->highest_tsn_inside_nr_map = asoc->cumulative_tsn;
2340 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->highest_tsn_inside_map)) {
2341 highest_tsn = asoc->highest_tsn_inside_nr_map;
2343 highest_tsn = asoc->highest_tsn_inside_map;
2345 if ((asoc->cumulative_tsn == highest_tsn) && (at >= 8)) {
2346 /* The complete array was completed by a single FR */
2347 /* highest becomes the cum-ack */
2355 /* clear the array */
2356 clr = ((at + 7) >> 3);
2357 if (clr > asoc->mapping_array_size) {
2358 clr = asoc->mapping_array_size;
2360 memset(asoc->mapping_array, 0, clr);
2361 memset(asoc->nr_mapping_array, 0, clr);
2363 for (i = 0; i < asoc->mapping_array_size; i++) {
2364 if ((asoc->mapping_array[i]) || (asoc->nr_mapping_array[i])) {
2365 SCTP_PRINTF("Error Mapping array's not clean at clear\n");
2366 sctp_print_mapping_array(asoc);
2370 asoc->mapping_array_base_tsn = asoc->cumulative_tsn + 1;
2371 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map = asoc->cumulative_tsn;
2372 } else if (at >= 8) {
2373 /* we can slide the mapping array down */
2374 /* slide_from holds where we hit the first NON 0xff byte */
2377 * now calculate the ceiling of the move using our highest
2380 SCTP_CALC_TSN_TO_GAP(lgap, highest_tsn, asoc->mapping_array_base_tsn);
2381 slide_end = (lgap >> 3);
2382 if (slide_end < slide_from) {
2383 sctp_print_mapping_array(asoc);
2385 panic("impossible slide");
2387 SCTP_PRINTF("impossible slide lgap: %x slide_end: %x slide_from: %x? at: %d\n",
2388 lgap, slide_end, slide_from, at);
2392 if (slide_end > asoc->mapping_array_size) {
2394 panic("would overrun buffer");
2396 SCTP_PRINTF("Gak, would have overrun map end: %d slide_end: %d\n",
2397 asoc->mapping_array_size, slide_end);
2398 slide_end = asoc->mapping_array_size;
2401 distance = (slide_end - slide_from) + 1;
2402 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
2403 sctp_log_map(old_base, old_cumack, old_highest,
2404 SCTP_MAP_PREPARE_SLIDE);
2405 sctp_log_map((uint32_t) slide_from, (uint32_t) slide_end,
2406 (uint32_t) lgap, SCTP_MAP_SLIDE_FROM);
2408 if (distance + slide_from > asoc->mapping_array_size ||
2411 * Here we do NOT slide forward the array so that
2412 * hopefully when more data comes in to fill it up
2413 * we will be able to slide it forward. Really I
2414 * don't think this should happen :-0
2417 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
2418 sctp_log_map((uint32_t) distance, (uint32_t) slide_from,
2419 (uint32_t) asoc->mapping_array_size,
2420 SCTP_MAP_SLIDE_NONE);
2425 for (ii = 0; ii < distance; ii++) {
2426 asoc->mapping_array[ii] = asoc->mapping_array[slide_from + ii];
2427 asoc->nr_mapping_array[ii] = asoc->nr_mapping_array[slide_from + ii];
2430 for (ii = distance; ii < asoc->mapping_array_size; ii++) {
2431 asoc->mapping_array[ii] = 0;
2432 asoc->nr_mapping_array[ii] = 0;
2434 if (asoc->highest_tsn_inside_map + 1 == asoc->mapping_array_base_tsn) {
2435 asoc->highest_tsn_inside_map += (slide_from << 3);
2437 if (asoc->highest_tsn_inside_nr_map + 1 == asoc->mapping_array_base_tsn) {
2438 asoc->highest_tsn_inside_nr_map += (slide_from << 3);
2440 asoc->mapping_array_base_tsn += (slide_from << 3);
2441 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
2442 sctp_log_map(asoc->mapping_array_base_tsn,
2443 asoc->cumulative_tsn, asoc->highest_tsn_inside_map,
2444 SCTP_MAP_SLIDE_RESULT);
2451 sctp_sack_check(struct sctp_tcb *stcb, int was_a_gap)
2453 struct sctp_association *asoc;
2454 uint32_t highest_tsn;
2457 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->highest_tsn_inside_map)) {
2458 highest_tsn = asoc->highest_tsn_inside_nr_map;
2460 highest_tsn = asoc->highest_tsn_inside_map;
2464 * Now we need to see if we need to queue a sack or just start the
2465 * timer (if allowed).
2467 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
2469 * Ok special case, in SHUTDOWN-SENT case. here we maker
2470 * sure SACK timer is off and instead send a SHUTDOWN and a
2473 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
2474 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
2475 stcb->sctp_ep, stcb, NULL,
2476 SCTP_FROM_SCTP_INDATA + SCTP_LOC_17);
2478 sctp_send_shutdown(stcb,
2479 ((stcb->asoc.alternate) ? stcb->asoc.alternate : stcb->asoc.primary_destination));
2480 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
2484 /* is there a gap now ? */
2485 is_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
2488 * CMT DAC algorithm: increase number of packets received
2491 stcb->asoc.cmt_dac_pkts_rcvd++;
2493 if ((stcb->asoc.send_sack == 1) || /* We need to send a
2495 ((was_a_gap) && (is_a_gap == 0)) || /* was a gap, but no
2497 (stcb->asoc.numduptsns) || /* we have dup's */
2498 (is_a_gap) || /* is still a gap */
2499 (stcb->asoc.delayed_ack == 0) || /* Delayed sack disabled */
2500 (stcb->asoc.data_pkts_seen >= stcb->asoc.sack_freq) /* hit limit of pkts */
2503 if ((stcb->asoc.sctp_cmt_on_off > 0) &&
2504 (SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) &&
2505 (stcb->asoc.send_sack == 0) &&
2506 (stcb->asoc.numduptsns == 0) &&
2507 (stcb->asoc.delayed_ack) &&
2508 (!SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer))) {
2511 * CMT DAC algorithm: With CMT, delay acks
2512 * even in the face of
2514 * reordering. Therefore, if acks that do not
2515 * have to be sent because of the above
2516 * reasons, will be delayed. That is, acks
2517 * that would have been sent due to gap
2518 * reports will be delayed with DAC. Start
2519 * the delayed ack timer.
2521 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
2522 stcb->sctp_ep, stcb, NULL);
2525 * Ok we must build a SACK since the timer
2526 * is pending, we got our first packet OR
2527 * there are gaps or duplicates.
2529 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
2530 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
2533 if (!SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
2534 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
2535 stcb->sctp_ep, stcb, NULL);
2542 sctp_process_data(struct mbuf **mm, int iphlen, int *offset, int length,
2543 struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2544 struct sctp_nets *net, uint32_t * high_tsn)
2546 struct sctp_chunkhdr *ch, chunk_buf;
2547 struct sctp_association *asoc;
2548 int num_chunks = 0; /* number of control chunks processed */
2550 int chk_length, break_flag, last_chunk;
2551 int abort_flag = 0, was_a_gap;
2553 uint32_t highest_tsn;
2556 sctp_set_rwnd(stcb, &stcb->asoc);
2559 SCTP_TCB_LOCK_ASSERT(stcb);
2561 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->highest_tsn_inside_map)) {
2562 highest_tsn = asoc->highest_tsn_inside_nr_map;
2564 highest_tsn = asoc->highest_tsn_inside_map;
2566 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
2568 * setup where we got the last DATA packet from for any SACK that
2569 * may need to go out. Don't bump the net. This is done ONLY when a
2570 * chunk is assigned.
2572 asoc->last_data_chunk_from = net;
2575 * Now before we proceed we must figure out if this is a wasted
2576 * cluster... i.e. it is a small packet sent in and yet the driver
2577 * underneath allocated a full cluster for it. If so we must copy it
2578 * to a smaller mbuf and free up the cluster mbuf. This will help
2579 * with cluster starvation. Note for __Panda__ we don't do this
2580 * since it has clusters all the way down to 64 bytes.
2582 if (SCTP_BUF_LEN(m) < (long)MLEN && SCTP_BUF_NEXT(m) == NULL) {
2583 /* we only handle mbufs that are singletons.. not chains */
2584 m = sctp_get_mbuf_for_msg(SCTP_BUF_LEN(m), 0, M_NOWAIT, 1, MT_DATA);
2586 /* ok lets see if we can copy the data up */
2589 /* get the pointers and copy */
2590 to = mtod(m, caddr_t *);
2591 from = mtod((*mm), caddr_t *);
2592 memcpy(to, from, SCTP_BUF_LEN((*mm)));
2593 /* copy the length and free up the old */
2594 SCTP_BUF_LEN(m) = SCTP_BUF_LEN((*mm));
2596 /* success, back copy */
2599 /* We are in trouble in the mbuf world .. yikes */
2603 /* get pointer to the first chunk header */
2604 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
2605 sizeof(struct sctp_chunkhdr), (uint8_t *) & chunk_buf);
2610 * process all DATA chunks...
2612 *high_tsn = asoc->cumulative_tsn;
2614 asoc->data_pkts_seen++;
2615 while (stop_proc == 0) {
2616 /* validate chunk length */
2617 chk_length = ntohs(ch->chunk_length);
2618 if (length - *offset < chk_length) {
2619 /* all done, mutulated chunk */
2623 if ((asoc->idata_supported == 1) &&
2624 (ch->chunk_type == SCTP_DATA)) {
2625 struct mbuf *op_err;
2626 char msg[SCTP_DIAG_INFO_LEN];
2628 snprintf(msg, sizeof(msg), "%s", "I-DATA chunk received when DATA was negotiated");
2629 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
2630 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_18;
2631 sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED);
2634 if ((asoc->idata_supported == 0) &&
2635 (ch->chunk_type == SCTP_IDATA)) {
2636 struct mbuf *op_err;
2637 char msg[SCTP_DIAG_INFO_LEN];
2639 snprintf(msg, sizeof(msg), "%s", "DATA chunk received when I-DATA was negotiated");
2640 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
2641 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_19;
2642 sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED);
2645 if ((ch->chunk_type == SCTP_DATA) ||
2646 (ch->chunk_type == SCTP_IDATA)) {
2649 if (ch->chunk_type == SCTP_DATA) {
2650 clen = sizeof(struct sctp_data_chunk);
2652 clen = sizeof(struct sctp_idata_chunk);
2654 if (chk_length < clen) {
2656 * Need to send an abort since we had a
2657 * invalid data chunk.
2659 struct mbuf *op_err;
2660 char msg[SCTP_DIAG_INFO_LEN];
2662 snprintf(msg, sizeof(msg), "DATA chunk of length %d",
2664 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
2665 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_20;
2666 sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED);
2669 #ifdef SCTP_AUDITING_ENABLED
2670 sctp_audit_log(0xB1, 0);
2672 if (SCTP_SIZE32(chk_length) == (length - *offset)) {
2677 if (sctp_process_a_data_chunk(stcb, asoc, mm, *offset,
2678 chk_length, net, high_tsn, &abort_flag, &break_flag,
2679 last_chunk, ch->chunk_type)) {
2687 * Set because of out of rwnd space and no
2688 * drop rep space left.
2694 /* not a data chunk in the data region */
2695 switch (ch->chunk_type) {
2696 case SCTP_INITIATION:
2697 case SCTP_INITIATION_ACK:
2698 case SCTP_SELECTIVE_ACK:
2699 case SCTP_NR_SELECTIVE_ACK:
2700 case SCTP_HEARTBEAT_REQUEST:
2701 case SCTP_HEARTBEAT_ACK:
2702 case SCTP_ABORT_ASSOCIATION:
2704 case SCTP_SHUTDOWN_ACK:
2705 case SCTP_OPERATION_ERROR:
2706 case SCTP_COOKIE_ECHO:
2707 case SCTP_COOKIE_ACK:
2710 case SCTP_SHUTDOWN_COMPLETE:
2711 case SCTP_AUTHENTICATION:
2712 case SCTP_ASCONF_ACK:
2713 case SCTP_PACKET_DROPPED:
2714 case SCTP_STREAM_RESET:
2715 case SCTP_FORWARD_CUM_TSN:
2719 * Now, what do we do with KNOWN
2720 * chunks that are NOT in the right
2723 * For now, I do nothing but ignore
2724 * them. We may later want to add
2725 * sysctl stuff to switch out and do
2726 * either an ABORT() or possibly
2729 struct mbuf *op_err;
2730 char msg[SCTP_DIAG_INFO_LEN];
2732 snprintf(msg, sizeof(msg), "DATA chunk followed by chunk of type %2.2x",
2734 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
2735 sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED);
2739 /* unknown chunk type, use bit rules */
2740 if (ch->chunk_type & 0x40) {
2741 /* Add a error report to the queue */
2742 struct mbuf *op_err;
2743 struct sctp_gen_error_cause *cause;
2745 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause),
2746 0, M_NOWAIT, 1, MT_DATA);
2747 if (op_err != NULL) {
2748 cause = mtod(op_err, struct sctp_gen_error_cause *);
2749 cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK);
2750 cause->length = htons((uint16_t) (chk_length + sizeof(struct sctp_gen_error_cause)));
2751 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
2752 SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, chk_length, M_NOWAIT);
2753 if (SCTP_BUF_NEXT(op_err) != NULL) {
2754 sctp_queue_op_err(stcb, op_err);
2756 sctp_m_freem(op_err);
2760 if ((ch->chunk_type & 0x80) == 0) {
2761 /* discard the rest of this packet */
2763 } /* else skip this bad chunk and
2766 } /* switch of chunk type */
2768 *offset += SCTP_SIZE32(chk_length);
2769 if ((*offset >= length) || stop_proc) {
2770 /* no more data left in the mbuf chain */
2774 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
2775 sizeof(struct sctp_chunkhdr), (uint8_t *) & chunk_buf);
2784 * we need to report rwnd overrun drops.
2786 sctp_send_packet_dropped(stcb, net, *mm, length, iphlen, 0);
2790 * Did we get data, if so update the time for auto-close and
2791 * give peer credit for being alive.
2793 SCTP_STAT_INCR(sctps_recvpktwithdata);
2794 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
2795 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
2796 stcb->asoc.overall_error_count,
2798 SCTP_FROM_SCTP_INDATA,
2801 stcb->asoc.overall_error_count = 0;
2802 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_last_rcvd);
2804 /* now service all of the reassm queue if needed */
2805 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
2806 /* Assure that we ack right away */
2807 stcb->asoc.send_sack = 1;
2809 /* Start a sack timer or QUEUE a SACK for sending */
2810 sctp_sack_check(stcb, was_a_gap);
2815 sctp_process_segment_range(struct sctp_tcb *stcb, struct sctp_tmit_chunk **p_tp1, uint32_t last_tsn,
2816 uint16_t frag_strt, uint16_t frag_end, int nr_sacking,
2818 uint32_t * biggest_newly_acked_tsn,
2819 uint32_t * this_sack_lowest_newack,
2822 struct sctp_tmit_chunk *tp1;
2823 unsigned int theTSN;
2824 int j, wake_him = 0, circled = 0;
2826 /* Recover the tp1 we last saw */
2829 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue);
2831 for (j = frag_strt; j <= frag_end; j++) {
2832 theTSN = j + last_tsn;
2834 if (tp1->rec.data.doing_fast_retransmit)
2838 * CMT: CUCv2 algorithm. For each TSN being
2839 * processed from the sent queue, track the
2840 * next expected pseudo-cumack, or
2841 * rtx_pseudo_cumack, if required. Separate
2842 * cumack trackers for first transmissions,
2843 * and retransmissions.
2845 if ((tp1->sent < SCTP_DATAGRAM_RESEND) &&
2846 (tp1->whoTo->find_pseudo_cumack == 1) &&
2847 (tp1->snd_count == 1)) {
2848 tp1->whoTo->pseudo_cumack = tp1->rec.data.TSN_seq;
2849 tp1->whoTo->find_pseudo_cumack = 0;
2851 if ((tp1->sent < SCTP_DATAGRAM_RESEND) &&
2852 (tp1->whoTo->find_rtx_pseudo_cumack == 1) &&
2853 (tp1->snd_count > 1)) {
2854 tp1->whoTo->rtx_pseudo_cumack = tp1->rec.data.TSN_seq;
2855 tp1->whoTo->find_rtx_pseudo_cumack = 0;
2857 if (tp1->rec.data.TSN_seq == theTSN) {
2858 if (tp1->sent != SCTP_DATAGRAM_UNSENT) {
2860 * must be held until
2863 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
2865 * If it is less than RESEND, it is
2866 * now no-longer in flight.
2867 * Higher values may already be set
2868 * via previous Gap Ack Blocks...
2869 * i.e. ACKED or RESEND.
2871 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq,
2872 *biggest_newly_acked_tsn)) {
2873 *biggest_newly_acked_tsn = tp1->rec.data.TSN_seq;
2876 * CMT: SFR algo (and HTNA) - set
2877 * saw_newack to 1 for dest being
2878 * newly acked. update
2879 * this_sack_highest_newack if
2882 if (tp1->rec.data.chunk_was_revoked == 0)
2883 tp1->whoTo->saw_newack = 1;
2885 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq,
2886 tp1->whoTo->this_sack_highest_newack)) {
2887 tp1->whoTo->this_sack_highest_newack =
2888 tp1->rec.data.TSN_seq;
2891 * CMT DAC algo: also update
2892 * this_sack_lowest_newack
2894 if (*this_sack_lowest_newack == 0) {
2895 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
2896 sctp_log_sack(*this_sack_lowest_newack,
2898 tp1->rec.data.TSN_seq,
2901 SCTP_LOG_TSN_ACKED);
2903 *this_sack_lowest_newack = tp1->rec.data.TSN_seq;
2906 * CMT: CUCv2 algorithm. If (rtx-)pseudo-cumack for corresp
2907 * dest is being acked, then we have a new (rtx-)pseudo-cumack. Set
2908 * new_(rtx_)pseudo_cumack to TRUE so that the cwnd for this dest can be
2909 * updated. Also trigger search for the next expected (rtx-)pseudo-cumack.
2910 * Separate pseudo_cumack trackers for first transmissions and
2913 if (tp1->rec.data.TSN_seq == tp1->whoTo->pseudo_cumack) {
2914 if (tp1->rec.data.chunk_was_revoked == 0) {
2915 tp1->whoTo->new_pseudo_cumack = 1;
2917 tp1->whoTo->find_pseudo_cumack = 1;
2919 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
2920 sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK);
2922 if (tp1->rec.data.TSN_seq == tp1->whoTo->rtx_pseudo_cumack) {
2923 if (tp1->rec.data.chunk_was_revoked == 0) {
2924 tp1->whoTo->new_pseudo_cumack = 1;
2926 tp1->whoTo->find_rtx_pseudo_cumack = 1;
2928 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
2929 sctp_log_sack(*biggest_newly_acked_tsn,
2931 tp1->rec.data.TSN_seq,
2934 SCTP_LOG_TSN_ACKED);
2936 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
2937 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_GAP,
2938 tp1->whoTo->flight_size,
2940 (uint32_t) (uintptr_t) tp1->whoTo,
2941 tp1->rec.data.TSN_seq);
2943 sctp_flight_size_decrease(tp1);
2944 if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) {
2945 (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo,
2948 sctp_total_flight_decrease(stcb, tp1);
2950 tp1->whoTo->net_ack += tp1->send_size;
2951 if (tp1->snd_count < 2) {
2953 * True non-retransmited chunk
2955 tp1->whoTo->net_ack2 += tp1->send_size;
2963 sctp_calculate_rto(stcb,
2966 &tp1->sent_rcv_time,
2967 sctp_align_safe_nocopy,
2968 SCTP_RTT_FROM_DATA);
2971 if (tp1->whoTo->rto_needed == 0) {
2972 tp1->whoTo->rto_needed = 1;
2978 if (tp1->sent <= SCTP_DATAGRAM_RESEND) {
2979 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq,
2980 stcb->asoc.this_sack_highest_gap)) {
2981 stcb->asoc.this_sack_highest_gap =
2982 tp1->rec.data.TSN_seq;
2984 if (tp1->sent == SCTP_DATAGRAM_RESEND) {
2985 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
2986 #ifdef SCTP_AUDITING_ENABLED
2987 sctp_audit_log(0xB2,
2988 (stcb->asoc.sent_queue_retran_cnt & 0x000000ff));
2993 * All chunks NOT UNSENT fall through here and are marked
2994 * (leave PR-SCTP ones that are to skip alone though)
2996 if ((tp1->sent != SCTP_FORWARD_TSN_SKIP) &&
2997 (tp1->sent != SCTP_DATAGRAM_NR_ACKED)) {
2998 tp1->sent = SCTP_DATAGRAM_MARKED;
3000 if (tp1->rec.data.chunk_was_revoked) {
3001 /* deflate the cwnd */
3002 tp1->whoTo->cwnd -= tp1->book_size;
3003 tp1->rec.data.chunk_was_revoked = 0;
3005 /* NR Sack code here */
3007 (tp1->sent != SCTP_DATAGRAM_NR_ACKED)) {
3008 if (stcb->asoc.strmout[tp1->rec.data.stream_number].chunks_on_queues > 0) {
3009 stcb->asoc.strmout[tp1->rec.data.stream_number].chunks_on_queues--;
3012 panic("No chunks on the queues for sid %u.", tp1->rec.data.stream_number);
3015 if ((stcb->asoc.strmout[tp1->rec.data.stream_number].chunks_on_queues == 0) &&
3016 (stcb->asoc.strmout[tp1->rec.data.stream_number].state == SCTP_STREAM_RESET_PENDING) &&
3017 TAILQ_EMPTY(&stcb->asoc.strmout[tp1->rec.data.stream_number].outqueue)) {
3018 stcb->asoc.trigger_reset = 1;
3020 tp1->sent = SCTP_DATAGRAM_NR_ACKED;
3026 sctp_free_bufspace(stcb, &stcb->asoc, tp1, 1);
3027 sctp_m_freem(tp1->data);
3034 } /* if (tp1->TSN_seq == theTSN) */
3035 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, theTSN)) {
3038 tp1 = TAILQ_NEXT(tp1, sctp_next);
3039 if ((tp1 == NULL) && (circled == 0)) {
3041 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue);
3043 } /* end while (tp1) */
3046 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue);
3048 /* In case the fragments were not in order we must reset */
3049 } /* end for (j = fragStart */
3051 return (wake_him); /* Return value only used for nr-sack */
3056 sctp_handle_segments(struct mbuf *m, int *offset, struct sctp_tcb *stcb, struct sctp_association *asoc,
3057 uint32_t last_tsn, uint32_t * biggest_tsn_acked,
3058 uint32_t * biggest_newly_acked_tsn, uint32_t * this_sack_lowest_newack,
3059 int num_seg, int num_nr_seg, int *rto_ok)
3061 struct sctp_gap_ack_block *frag, block;
3062 struct sctp_tmit_chunk *tp1;
3067 uint16_t frag_strt, frag_end, prev_frag_end;
3069 tp1 = TAILQ_FIRST(&asoc->sent_queue);
3073 for (i = 0; i < (num_seg + num_nr_seg); i++) {
3076 tp1 = TAILQ_FIRST(&asoc->sent_queue);
3078 frag = (struct sctp_gap_ack_block *)sctp_m_getptr(m, *offset,
3079 sizeof(struct sctp_gap_ack_block), (uint8_t *) & block);
3080 *offset += sizeof(block);
3082 return (chunk_freed);
3084 frag_strt = ntohs(frag->start);
3085 frag_end = ntohs(frag->end);
3087 if (frag_strt > frag_end) {
3088 /* This gap report is malformed, skip it. */
3091 if (frag_strt <= prev_frag_end) {
3092 /* This gap report is not in order, so restart. */
3093 tp1 = TAILQ_FIRST(&asoc->sent_queue);
3095 if (SCTP_TSN_GT((last_tsn + frag_end), *biggest_tsn_acked)) {
3096 *biggest_tsn_acked = last_tsn + frag_end;
3103 if (sctp_process_segment_range(stcb, &tp1, last_tsn, frag_strt, frag_end,
3104 non_revocable, &num_frs, biggest_newly_acked_tsn,
3105 this_sack_lowest_newack, rto_ok)) {
3108 prev_frag_end = frag_end;
3110 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
3112 sctp_log_fr(*biggest_tsn_acked,
3113 *biggest_newly_acked_tsn,
3114 last_tsn, SCTP_FR_LOG_BIGGEST_TSNS);
3116 return (chunk_freed);
3120 sctp_check_for_revoked(struct sctp_tcb *stcb,
3121 struct sctp_association *asoc, uint32_t cumack,
3122 uint32_t biggest_tsn_acked)
3124 struct sctp_tmit_chunk *tp1;
3126 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
3127 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, cumack)) {
3129 * ok this guy is either ACK or MARKED. If it is
3130 * ACKED it has been previously acked but not this
3131 * time i.e. revoked. If it is MARKED it was ACK'ed
3134 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, biggest_tsn_acked)) {
3137 if (tp1->sent == SCTP_DATAGRAM_ACKED) {
3138 /* it has been revoked */
3139 tp1->sent = SCTP_DATAGRAM_SENT;
3140 tp1->rec.data.chunk_was_revoked = 1;
3142 * We must add this stuff back in to assure
3143 * timers and such get started.
3145 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3146 sctp_misc_ints(SCTP_FLIGHT_LOG_UP_REVOKE,
3147 tp1->whoTo->flight_size,
3149 (uint32_t) (uintptr_t) tp1->whoTo,
3150 tp1->rec.data.TSN_seq);
3152 sctp_flight_size_increase(tp1);
3153 sctp_total_flight_increase(stcb, tp1);
3155 * We inflate the cwnd to compensate for our
3156 * artificial inflation of the flight_size.
3158 tp1->whoTo->cwnd += tp1->book_size;
3159 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
3160 sctp_log_sack(asoc->last_acked_seq,
3162 tp1->rec.data.TSN_seq,
3165 SCTP_LOG_TSN_REVOKED);
3167 } else if (tp1->sent == SCTP_DATAGRAM_MARKED) {
3168 /* it has been re-acked in this SACK */
3169 tp1->sent = SCTP_DATAGRAM_ACKED;
3172 if (tp1->sent == SCTP_DATAGRAM_UNSENT)
3179 sctp_strike_gap_ack_chunks(struct sctp_tcb *stcb, struct sctp_association *asoc,
3180 uint32_t biggest_tsn_acked, uint32_t biggest_tsn_newly_acked, uint32_t this_sack_lowest_newack, int accum_moved)
3182 struct sctp_tmit_chunk *tp1;
3183 int strike_flag = 0;
3185 int tot_retrans = 0;
3186 uint32_t sending_seq;
3187 struct sctp_nets *net;
3188 int num_dests_sacked = 0;
3191 * select the sending_seq, this is either the next thing ready to be
3192 * sent but not transmitted, OR, the next seq we assign.
3194 tp1 = TAILQ_FIRST(&stcb->asoc.send_queue);
3196 sending_seq = asoc->sending_seq;
3198 sending_seq = tp1->rec.data.TSN_seq;
3201 /* CMT DAC algo: finding out if SACK is a mixed SACK */
3202 if ((asoc->sctp_cmt_on_off > 0) &&
3203 SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
3204 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
3205 if (net->saw_newack)
3209 if (stcb->asoc.prsctp_supported) {
3210 (void)SCTP_GETTIME_TIMEVAL(&now);
3212 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
3214 if (tp1->no_fr_allowed) {
3215 /* this one had a timeout or something */
3218 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
3219 if (tp1->sent < SCTP_DATAGRAM_RESEND)
3220 sctp_log_fr(biggest_tsn_newly_acked,
3221 tp1->rec.data.TSN_seq,
3223 SCTP_FR_LOG_CHECK_STRIKE);
3225 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, biggest_tsn_acked) ||
3226 tp1->sent == SCTP_DATAGRAM_UNSENT) {
3230 if (stcb->asoc.prsctp_supported) {
3231 if ((PR_SCTP_TTL_ENABLED(tp1->flags)) && tp1->sent < SCTP_DATAGRAM_ACKED) {
3232 /* Is it expired? */
3233 if (timevalcmp(&now, &tp1->rec.data.timetodrop, >)) {
3234 /* Yes so drop it */
3235 if (tp1->data != NULL) {
3236 (void)sctp_release_pr_sctp_chunk(stcb, tp1, 1,
3237 SCTP_SO_NOT_LOCKED);
3243 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, asoc->this_sack_highest_gap)) {
3244 /* we are beyond the tsn in the sack */
3247 if (tp1->sent >= SCTP_DATAGRAM_RESEND) {
3248 /* either a RESEND, ACKED, or MARKED */
3250 if (tp1->sent == SCTP_FORWARD_TSN_SKIP) {
3251 /* Continue strikin FWD-TSN chunks */
3252 tp1->rec.data.fwd_tsn_cnt++;
3257 * CMT : SFR algo (covers part of DAC and HTNA as well)
3259 if (tp1->whoTo && tp1->whoTo->saw_newack == 0) {
3261 * No new acks were receieved for data sent to this
3262 * dest. Therefore, according to the SFR algo for
3263 * CMT, no data sent to this dest can be marked for
3264 * FR using this SACK.
3267 } else if (tp1->whoTo && SCTP_TSN_GT(tp1->rec.data.TSN_seq,
3268 tp1->whoTo->this_sack_highest_newack)) {
3270 * CMT: New acks were receieved for data sent to
3271 * this dest. But no new acks were seen for data
3272 * sent after tp1. Therefore, according to the SFR
3273 * algo for CMT, tp1 cannot be marked for FR using
3274 * this SACK. This step covers part of the DAC algo
3275 * and the HTNA algo as well.
3280 * Here we check to see if we were have already done a FR
3281 * and if so we see if the biggest TSN we saw in the sack is
3282 * smaller than the recovery point. If so we don't strike
3283 * the tsn... otherwise we CAN strike the TSN.
3286 * @@@ JRI: Check for CMT if (accum_moved &&
3287 * asoc->fast_retran_loss_recovery && (sctp_cmt_on_off ==
3290 if (accum_moved && asoc->fast_retran_loss_recovery) {
3292 * Strike the TSN if in fast-recovery and cum-ack
3295 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
3296 sctp_log_fr(biggest_tsn_newly_acked,
3297 tp1->rec.data.TSN_seq,
3299 SCTP_FR_LOG_STRIKE_CHUNK);
3301 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3304 if ((asoc->sctp_cmt_on_off > 0) &&
3305 SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
3307 * CMT DAC algorithm: If SACK flag is set to
3308 * 0, then lowest_newack test will not pass
3309 * because it would have been set to the
3310 * cumack earlier. If not already to be
3311 * rtx'd, If not a mixed sack and if tp1 is
3312 * not between two sacked TSNs, then mark by
3313 * one more. NOTE that we are marking by one
3314 * additional time since the SACK DAC flag
3315 * indicates that two packets have been
3316 * received after this missing TSN.
3318 if ((tp1->sent < SCTP_DATAGRAM_RESEND) && (num_dests_sacked == 1) &&
3319 SCTP_TSN_GT(this_sack_lowest_newack, tp1->rec.data.TSN_seq)) {
3320 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
3321 sctp_log_fr(16 + num_dests_sacked,
3322 tp1->rec.data.TSN_seq,
3324 SCTP_FR_LOG_STRIKE_CHUNK);
3329 } else if ((tp1->rec.data.doing_fast_retransmit) &&
3330 (asoc->sctp_cmt_on_off == 0)) {
3332 * For those that have done a FR we must take
3333 * special consideration if we strike. I.e the
3334 * biggest_newly_acked must be higher than the
3335 * sending_seq at the time we did the FR.
3338 #ifdef SCTP_FR_TO_ALTERNATE
3340 * If FR's go to new networks, then we must only do
3341 * this for singly homed asoc's. However if the FR's
3342 * go to the same network (Armando's work) then its
3343 * ok to FR multiple times.
3351 if (SCTP_TSN_GE(biggest_tsn_newly_acked,
3352 tp1->rec.data.fast_retran_tsn)) {
3354 * Strike the TSN, since this ack is
3355 * beyond where things were when we
3358 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
3359 sctp_log_fr(biggest_tsn_newly_acked,
3360 tp1->rec.data.TSN_seq,
3362 SCTP_FR_LOG_STRIKE_CHUNK);
3364 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3368 if ((asoc->sctp_cmt_on_off > 0) &&
3369 SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
3371 * CMT DAC algorithm: If
3372 * SACK flag is set to 0,
3373 * then lowest_newack test
3374 * will not pass because it
3375 * would have been set to
3376 * the cumack earlier. If
3377 * not already to be rtx'd,
3378 * If not a mixed sack and
3379 * if tp1 is not between two
3380 * sacked TSNs, then mark by
3381 * one more. NOTE that we
3382 * are marking by one
3383 * additional time since the
3384 * SACK DAC flag indicates
3385 * that two packets have
3386 * been received after this
3389 if ((tp1->sent < SCTP_DATAGRAM_RESEND) &&
3390 (num_dests_sacked == 1) &&
3391 SCTP_TSN_GT(this_sack_lowest_newack,
3392 tp1->rec.data.TSN_seq)) {
3393 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
3394 sctp_log_fr(32 + num_dests_sacked,
3395 tp1->rec.data.TSN_seq,
3397 SCTP_FR_LOG_STRIKE_CHUNK);
3399 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3407 * JRI: TODO: remove code for HTNA algo. CMT's SFR
3410 } else if (SCTP_TSN_GT(tp1->rec.data.TSN_seq,
3411 biggest_tsn_newly_acked)) {
3413 * We don't strike these: This is the HTNA
3414 * algorithm i.e. we don't strike If our TSN is
3415 * larger than the Highest TSN Newly Acked.
3419 /* Strike the TSN */
3420 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
3421 sctp_log_fr(biggest_tsn_newly_acked,
3422 tp1->rec.data.TSN_seq,
3424 SCTP_FR_LOG_STRIKE_CHUNK);
3426 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3429 if ((asoc->sctp_cmt_on_off > 0) &&
3430 SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
3432 * CMT DAC algorithm: If SACK flag is set to
3433 * 0, then lowest_newack test will not pass
3434 * because it would have been set to the
3435 * cumack earlier. If not already to be
3436 * rtx'd, If not a mixed sack and if tp1 is
3437 * not between two sacked TSNs, then mark by
3438 * one more. NOTE that we are marking by one
3439 * additional time since the SACK DAC flag
3440 * indicates that two packets have been
3441 * received after this missing TSN.
3443 if ((tp1->sent < SCTP_DATAGRAM_RESEND) && (num_dests_sacked == 1) &&
3444 SCTP_TSN_GT(this_sack_lowest_newack, tp1->rec.data.TSN_seq)) {
3445 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
3446 sctp_log_fr(48 + num_dests_sacked,
3447 tp1->rec.data.TSN_seq,
3449 SCTP_FR_LOG_STRIKE_CHUNK);
3455 if (tp1->sent == SCTP_DATAGRAM_RESEND) {
3456 struct sctp_nets *alt;
3458 /* fix counts and things */
3459 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3460 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_RSND,
3461 (tp1->whoTo ? (tp1->whoTo->flight_size) : 0),
3463 (uint32_t) (uintptr_t) tp1->whoTo,
3464 tp1->rec.data.TSN_seq);
3467 tp1->whoTo->net_ack++;
3468 sctp_flight_size_decrease(tp1);
3469 if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) {
3470 (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo,
3474 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
3475 sctp_log_rwnd(SCTP_INCREASE_PEER_RWND,
3476 asoc->peers_rwnd, tp1->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
3478 /* add back to the rwnd */
3479 asoc->peers_rwnd += (tp1->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
3481 /* remove from the total flight */
3482 sctp_total_flight_decrease(stcb, tp1);
3484 if ((stcb->asoc.prsctp_supported) &&
3485 (PR_SCTP_RTX_ENABLED(tp1->flags))) {
3487 * Has it been retransmitted tv_sec times? -
3488 * we store the retran count there.
3490 if (tp1->snd_count > tp1->rec.data.timetodrop.tv_sec) {
3491 /* Yes, so drop it */
3492 if (tp1->data != NULL) {
3493 (void)sctp_release_pr_sctp_chunk(stcb, tp1, 1,
3494 SCTP_SO_NOT_LOCKED);
3496 /* Make sure to flag we had a FR */
3497 tp1->whoTo->net_ack++;
3502 * SCTP_PRINTF("OK, we are now ready to FR this
3505 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
3506 sctp_log_fr(tp1->rec.data.TSN_seq, tp1->snd_count,
3510 /* This is a subsequent FR */
3511 SCTP_STAT_INCR(sctps_sendmultfastretrans);
3513 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3514 if (asoc->sctp_cmt_on_off > 0) {
3516 * CMT: Using RTX_SSTHRESH policy for CMT.
3517 * If CMT is being used, then pick dest with
3518 * largest ssthresh for any retransmission.
3520 tp1->no_fr_allowed = 1;
3522 /* sa_ignore NO_NULL_CHK */
3523 if (asoc->sctp_cmt_pf > 0) {
3525 * JRS 5/18/07 - If CMT PF is on,
3526 * use the PF version of
3529 alt = sctp_find_alternate_net(stcb, alt, 2);
3532 * JRS 5/18/07 - If only CMT is on,
3533 * use the CMT version of
3536 /* sa_ignore NO_NULL_CHK */
3537 alt = sctp_find_alternate_net(stcb, alt, 1);
3543 * CUCv2: If a different dest is picked for
3544 * the retransmission, then new
3545 * (rtx-)pseudo_cumack needs to be tracked
3546 * for orig dest. Let CUCv2 track new (rtx-)
3547 * pseudo-cumack always.
3550 tp1->whoTo->find_pseudo_cumack = 1;
3551 tp1->whoTo->find_rtx_pseudo_cumack = 1;
3553 } else {/* CMT is OFF */
3555 #ifdef SCTP_FR_TO_ALTERNATE
3556 /* Can we find an alternate? */
3557 alt = sctp_find_alternate_net(stcb, tp1->whoTo, 0);
3560 * default behavior is to NOT retransmit
3561 * FR's to an alternate. Armando Caro's
3562 * paper details why.
3568 tp1->rec.data.doing_fast_retransmit = 1;
3570 /* mark the sending seq for possible subsequent FR's */
3572 * SCTP_PRINTF("Marking TSN for FR new value %x\n",
3573 * (uint32_t)tpi->rec.data.TSN_seq);
3575 if (TAILQ_EMPTY(&asoc->send_queue)) {
3577 * If the queue of send is empty then its
3578 * the next sequence number that will be
3579 * assigned so we subtract one from this to
3580 * get the one we last sent.
3582 tp1->rec.data.fast_retran_tsn = sending_seq;
3585 * If there are chunks on the send queue
3586 * (unsent data that has made it from the
3587 * stream queues but not out the door, we
3588 * take the first one (which will have the
3589 * lowest TSN) and subtract one to get the
3592 struct sctp_tmit_chunk *ttt;
3594 ttt = TAILQ_FIRST(&asoc->send_queue);
3595 tp1->rec.data.fast_retran_tsn =
3596 ttt->rec.data.TSN_seq;
3601 * this guy had a RTO calculation pending on
3604 if ((tp1->whoTo != NULL) &&
3605 (tp1->whoTo->rto_needed == 0)) {
3606 tp1->whoTo->rto_needed = 1;
3610 if (alt != tp1->whoTo) {
3611 /* yes, there is an alternate. */
3612 sctp_free_remote_addr(tp1->whoTo);
3613 /* sa_ignore FREED_MEMORY */
3615 atomic_add_int(&alt->ref_count, 1);
3621 struct sctp_tmit_chunk *
3622 sctp_try_advance_peer_ack_point(struct sctp_tcb *stcb,
3623 struct sctp_association *asoc)
3625 struct sctp_tmit_chunk *tp1, *tp2, *a_adv = NULL;
3629 if (asoc->prsctp_supported == 0) {
3632 TAILQ_FOREACH_SAFE(tp1, &asoc->sent_queue, sctp_next, tp2) {
3633 if (tp1->sent != SCTP_FORWARD_TSN_SKIP &&
3634 tp1->sent != SCTP_DATAGRAM_RESEND &&
3635 tp1->sent != SCTP_DATAGRAM_NR_ACKED) {
3636 /* no chance to advance, out of here */
3639 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
3640 if ((tp1->sent == SCTP_FORWARD_TSN_SKIP) ||
3641 (tp1->sent == SCTP_DATAGRAM_NR_ACKED)) {
3642 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
3643 asoc->advanced_peer_ack_point,
3644 tp1->rec.data.TSN_seq, 0, 0);
3647 if (!PR_SCTP_ENABLED(tp1->flags)) {
3649 * We can't fwd-tsn past any that are reliable aka
3650 * retransmitted until the asoc fails.
3655 (void)SCTP_GETTIME_TIMEVAL(&now);
3659 * now we got a chunk which is marked for another
3660 * retransmission to a PR-stream but has run out its chances
3661 * already maybe OR has been marked to skip now. Can we skip
3662 * it if its a resend?
3664 if (tp1->sent == SCTP_DATAGRAM_RESEND &&
3665 (PR_SCTP_TTL_ENABLED(tp1->flags))) {
3667 * Now is this one marked for resend and its time is
3670 if (timevalcmp(&now, &tp1->rec.data.timetodrop, >)) {
3671 /* Yes so drop it */
3673 (void)sctp_release_pr_sctp_chunk(stcb, tp1,
3674 1, SCTP_SO_NOT_LOCKED);
3678 * No, we are done when hit one for resend
3679 * whos time as not expired.
3685 * Ok now if this chunk is marked to drop it we can clean up
3686 * the chunk, advance our peer ack point and we can check
3689 if ((tp1->sent == SCTP_FORWARD_TSN_SKIP) ||
3690 (tp1->sent == SCTP_DATAGRAM_NR_ACKED)) {
3691 /* advance PeerAckPoint goes forward */
3692 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, asoc->advanced_peer_ack_point)) {
3693 asoc->advanced_peer_ack_point = tp1->rec.data.TSN_seq;
3695 } else if (tp1->rec.data.TSN_seq == asoc->advanced_peer_ack_point) {
3696 /* No update but we do save the chk */
3701 * If it is still in RESEND we can advance no
3711 sctp_fs_audit(struct sctp_association *asoc)
3713 struct sctp_tmit_chunk *chk;
3714 int inflight = 0, resend = 0, inbetween = 0, acked = 0, above = 0;
3718 int entry_flight, entry_cnt;
3724 entry_flight = asoc->total_flight;
3725 entry_cnt = asoc->total_flight_count;
3727 if (asoc->pr_sctp_cnt >= asoc->sent_queue_cnt)
3730 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
3731 if (chk->sent < SCTP_DATAGRAM_RESEND) {
3732 SCTP_PRINTF("Chk TSN: %u size: %d inflight cnt: %d\n",
3733 chk->rec.data.TSN_seq,
3737 } else if (chk->sent == SCTP_DATAGRAM_RESEND) {
3739 } else if (chk->sent < SCTP_DATAGRAM_ACKED) {
3741 } else if (chk->sent > SCTP_DATAGRAM_ACKED) {
3748 if ((inflight > 0) || (inbetween > 0)) {
3750 panic("Flight size-express incorrect? \n");
3752 SCTP_PRINTF("asoc->total_flight: %d cnt: %d\n",
3753 entry_flight, entry_cnt);
3755 SCTP_PRINTF("Flight size-express incorrect F: %d I: %d R: %d Ab: %d ACK: %d\n",
3756 inflight, inbetween, resend, above, acked);
3765 sctp_window_probe_recovery(struct sctp_tcb *stcb,
3766 struct sctp_association *asoc,
3767 struct sctp_tmit_chunk *tp1)
3769 tp1->window_probe = 0;
3770 if ((tp1->sent >= SCTP_DATAGRAM_ACKED) || (tp1->data == NULL)) {
3771 /* TSN's skipped we do NOT move back. */
3772 sctp_misc_ints(SCTP_FLIGHT_LOG_DWN_WP_FWD,
3773 tp1->whoTo ? tp1->whoTo->flight_size : 0,
3775 (uint32_t) (uintptr_t) tp1->whoTo,
3776 tp1->rec.data.TSN_seq);
3779 /* First setup this by shrinking flight */
3780 if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) {
3781 (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo,
3784 sctp_flight_size_decrease(tp1);
3785 sctp_total_flight_decrease(stcb, tp1);
3786 /* Now mark for resend */
3787 tp1->sent = SCTP_DATAGRAM_RESEND;
3788 sctp_ucount_incr(asoc->sent_queue_retran_cnt);
3790 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3791 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_WP,
3792 tp1->whoTo->flight_size,
3794 (uint32_t) (uintptr_t) tp1->whoTo,
3795 tp1->rec.data.TSN_seq);
3800 sctp_express_handle_sack(struct sctp_tcb *stcb, uint32_t cumack,
3801 uint32_t rwnd, int *abort_now, int ecne_seen)
3803 struct sctp_nets *net;
3804 struct sctp_association *asoc;
3805 struct sctp_tmit_chunk *tp1, *tp2;
3807 int win_probe_recovery = 0;
3808 int win_probe_recovered = 0;
3809 int j, done_once = 0;
3813 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_SACK_ARRIVALS_ENABLE) {
3814 sctp_misc_ints(SCTP_SACK_LOG_EXPRESS, cumack,
3815 rwnd, stcb->asoc.last_acked_seq, stcb->asoc.peers_rwnd);
3817 SCTP_TCB_LOCK_ASSERT(stcb);
3818 #ifdef SCTP_ASOCLOG_OF_TSNS
3819 stcb->asoc.cumack_log[stcb->asoc.cumack_log_at] = cumack;
3820 stcb->asoc.cumack_log_at++;
3821 if (stcb->asoc.cumack_log_at > SCTP_TSN_LOG_SIZE) {
3822 stcb->asoc.cumack_log_at = 0;
3826 old_rwnd = asoc->peers_rwnd;
3827 if (SCTP_TSN_GT(asoc->last_acked_seq, cumack)) {
3830 } else if (asoc->last_acked_seq == cumack) {
3831 /* Window update sack */
3832 asoc->peers_rwnd = sctp_sbspace_sub(rwnd,
3833 (uint32_t) (asoc->total_flight + (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh))));
3834 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
3835 /* SWS sender side engages */
3836 asoc->peers_rwnd = 0;
3838 if (asoc->peers_rwnd > old_rwnd) {
3843 /* First setup for CC stuff */
3844 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
3845 if (SCTP_TSN_GT(cumack, net->cwr_window_tsn)) {
3846 /* Drag along the window_tsn for cwr's */
3847 net->cwr_window_tsn = cumack;
3849 net->prev_cwnd = net->cwnd;
3854 * CMT: Reset CUC and Fast recovery algo variables before
3857 net->new_pseudo_cumack = 0;
3858 net->will_exit_fast_recovery = 0;
3859 if (stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack) {
3860 (*stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack) (stcb, net);
3863 if (!TAILQ_EMPTY(&asoc->sent_queue)) {
3864 tp1 = TAILQ_LAST(&asoc->sent_queue,
3865 sctpchunk_listhead);
3866 send_s = tp1->rec.data.TSN_seq + 1;
3868 send_s = asoc->sending_seq;
3870 if (SCTP_TSN_GE(cumack, send_s)) {
3871 struct mbuf *op_err;
3872 char msg[SCTP_DIAG_INFO_LEN];
3876 snprintf(msg, sizeof(msg), "Cum ack %8.8x greater or equal than TSN %8.8x",
3878 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
3879 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_21;
3880 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
3883 asoc->this_sack_highest_gap = cumack;
3884 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
3885 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
3886 stcb->asoc.overall_error_count,
3888 SCTP_FROM_SCTP_INDATA,
3891 stcb->asoc.overall_error_count = 0;
3892 if (SCTP_TSN_GT(cumack, asoc->last_acked_seq)) {
3893 /* process the new consecutive TSN first */
3894 TAILQ_FOREACH_SAFE(tp1, &asoc->sent_queue, sctp_next, tp2) {
3895 if (SCTP_TSN_GE(cumack, tp1->rec.data.TSN_seq)) {
3896 if (tp1->sent == SCTP_DATAGRAM_UNSENT) {
3897 SCTP_PRINTF("Warning, an unsent is now acked?\n");
3899 if (tp1->sent < SCTP_DATAGRAM_ACKED) {
3901 * If it is less than ACKED, it is
3902 * now no-longer in flight. Higher
3903 * values may occur during marking
3905 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3906 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3907 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_CA,
3908 tp1->whoTo->flight_size,
3910 (uint32_t) (uintptr_t) tp1->whoTo,
3911 tp1->rec.data.TSN_seq);
3913 sctp_flight_size_decrease(tp1);
3914 if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) {
3915 (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo,
3918 /* sa_ignore NO_NULL_CHK */
3919 sctp_total_flight_decrease(stcb, tp1);
3921 tp1->whoTo->net_ack += tp1->send_size;
3922 if (tp1->snd_count < 2) {
3924 * True non-retransmited
3927 tp1->whoTo->net_ack2 +=
3930 /* update RTO too? */
3939 sctp_calculate_rto(stcb,
3941 &tp1->sent_rcv_time,
3942 sctp_align_safe_nocopy,
3943 SCTP_RTT_FROM_DATA);
3946 if (tp1->whoTo->rto_needed == 0) {
3947 tp1->whoTo->rto_needed = 1;
3953 * CMT: CUCv2 algorithm. From the
3954 * cumack'd TSNs, for each TSN being
3955 * acked for the first time, set the
3956 * following variables for the
3957 * corresp destination.
3958 * new_pseudo_cumack will trigger a
3960 * find_(rtx_)pseudo_cumack will
3961 * trigger search for the next
3962 * expected (rtx-)pseudo-cumack.
3964 tp1->whoTo->new_pseudo_cumack = 1;
3965 tp1->whoTo->find_pseudo_cumack = 1;
3966 tp1->whoTo->find_rtx_pseudo_cumack = 1;
3968 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
3969 /* sa_ignore NO_NULL_CHK */
3970 sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK);
3973 if (tp1->sent == SCTP_DATAGRAM_RESEND) {
3974 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
3976 if (tp1->rec.data.chunk_was_revoked) {
3977 /* deflate the cwnd */
3978 tp1->whoTo->cwnd -= tp1->book_size;
3979 tp1->rec.data.chunk_was_revoked = 0;
3981 if (tp1->sent != SCTP_DATAGRAM_NR_ACKED) {
3982 if (asoc->strmout[tp1->rec.data.stream_number].chunks_on_queues > 0) {
3983 asoc->strmout[tp1->rec.data.stream_number].chunks_on_queues--;
3986 panic("No chunks on the queues for sid %u.", tp1->rec.data.stream_number);
3990 if ((asoc->strmout[tp1->rec.data.stream_number].chunks_on_queues == 0) &&
3991 (asoc->strmout[tp1->rec.data.stream_number].state == SCTP_STREAM_RESET_PENDING) &&
3992 TAILQ_EMPTY(&asoc->strmout[tp1->rec.data.stream_number].outqueue)) {
3993 asoc->trigger_reset = 1;
3995 TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next);
3997 /* sa_ignore NO_NULL_CHK */
3998 sctp_free_bufspace(stcb, asoc, tp1, 1);
3999 sctp_m_freem(tp1->data);
4002 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
4003 sctp_log_sack(asoc->last_acked_seq,
4005 tp1->rec.data.TSN_seq,
4008 SCTP_LOG_FREE_SENT);
4010 asoc->sent_queue_cnt--;
4011 sctp_free_a_chunk(stcb, tp1, SCTP_SO_NOT_LOCKED);
4018 /* sa_ignore NO_NULL_CHK */
4019 if (stcb->sctp_socket) {
4020 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4024 SOCKBUF_LOCK(&stcb->sctp_socket->so_snd);
4025 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) {
4026 /* sa_ignore NO_NULL_CHK */
4027 sctp_wakeup_log(stcb, 1, SCTP_WAKESND_FROM_SACK);
4029 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4030 so = SCTP_INP_SO(stcb->sctp_ep);
4031 atomic_add_int(&stcb->asoc.refcnt, 1);
4032 SCTP_TCB_UNLOCK(stcb);
4033 SCTP_SOCKET_LOCK(so, 1);
4034 SCTP_TCB_LOCK(stcb);
4035 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4036 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
4037 /* assoc was freed while we were unlocked */
4038 SCTP_SOCKET_UNLOCK(so, 1);
4042 sctp_sowwakeup_locked(stcb->sctp_ep, stcb->sctp_socket);
4043 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4044 SCTP_SOCKET_UNLOCK(so, 1);
4047 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) {
4048 sctp_wakeup_log(stcb, 1, SCTP_NOWAKE_FROM_SACK);
4052 /* JRS - Use the congestion control given in the CC module */
4053 if ((asoc->last_acked_seq != cumack) && (ecne_seen == 0)) {
4054 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4055 if (net->net_ack2 > 0) {
4057 * Karn's rule applies to clearing error
4058 * count, this is optional.
4060 net->error_count = 0;
4061 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
4062 /* addr came good */
4063 net->dest_state |= SCTP_ADDR_REACHABLE;
4064 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
4065 0, (void *)net, SCTP_SO_NOT_LOCKED);
4067 if (net == stcb->asoc.primary_destination) {
4068 if (stcb->asoc.alternate) {
4070 * release the alternate,
4073 sctp_free_remote_addr(stcb->asoc.alternate);
4074 stcb->asoc.alternate = NULL;
4077 if (net->dest_state & SCTP_ADDR_PF) {
4078 net->dest_state &= ~SCTP_ADDR_PF;
4079 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT,
4080 stcb->sctp_ep, stcb, net,
4081 SCTP_FROM_SCTP_INDATA + SCTP_LOC_22);
4082 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
4083 asoc->cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
4084 /* Done with this net */
4087 /* restore any doubled timers */
4088 net->RTO = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv;
4089 if (net->RTO < stcb->asoc.minrto) {
4090 net->RTO = stcb->asoc.minrto;
4092 if (net->RTO > stcb->asoc.maxrto) {
4093 net->RTO = stcb->asoc.maxrto;
4097 asoc->cc_functions.sctp_cwnd_update_after_sack(stcb, asoc, 1, 0, 0);
4099 asoc->last_acked_seq = cumack;
4101 if (TAILQ_EMPTY(&asoc->sent_queue)) {
4102 /* nothing left in-flight */
4103 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4104 net->flight_size = 0;
4105 net->partial_bytes_acked = 0;
4107 asoc->total_flight = 0;
4108 asoc->total_flight_count = 0;
4111 asoc->peers_rwnd = sctp_sbspace_sub(rwnd,
4112 (uint32_t) (asoc->total_flight + (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh))));
4113 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4114 /* SWS sender side engages */
4115 asoc->peers_rwnd = 0;
4117 if (asoc->peers_rwnd > old_rwnd) {
4118 win_probe_recovery = 1;
4120 /* Now assure a timer where data is queued at */
4123 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4126 if (win_probe_recovery && (net->window_probe)) {
4127 win_probe_recovered = 1;
4129 * Find first chunk that was used with window probe
4130 * and clear the sent
4132 /* sa_ignore FREED_MEMORY */
4133 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
4134 if (tp1->window_probe) {
4135 /* move back to data send queue */
4136 sctp_window_probe_recovery(stcb, asoc, tp1);
4141 if (net->RTO == 0) {
4142 to_ticks = MSEC_TO_TICKS(stcb->asoc.initial_rto);
4144 to_ticks = MSEC_TO_TICKS(net->RTO);
4146 if (net->flight_size) {
4148 (void)SCTP_OS_TIMER_START(&net->rxt_timer.timer, to_ticks,
4149 sctp_timeout_handler, &net->rxt_timer);
4150 if (net->window_probe) {
4151 net->window_probe = 0;
4154 if (net->window_probe) {
4156 * In window probes we must assure a timer
4157 * is still running there
4159 net->window_probe = 0;
4160 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4161 SCTP_OS_TIMER_START(&net->rxt_timer.timer, to_ticks,
4162 sctp_timeout_handler, &net->rxt_timer);
4164 } else if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4165 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
4167 SCTP_FROM_SCTP_INDATA + SCTP_LOC_23);
4172 (!TAILQ_EMPTY(&asoc->sent_queue)) &&
4173 (asoc->sent_queue_retran_cnt == 0) &&
4174 (win_probe_recovered == 0) &&
4177 * huh, this should not happen unless all packets are
4178 * PR-SCTP and marked to skip of course.
4180 if (sctp_fs_audit(asoc)) {
4181 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4182 net->flight_size = 0;
4184 asoc->total_flight = 0;
4185 asoc->total_flight_count = 0;
4186 asoc->sent_queue_retran_cnt = 0;
4187 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
4188 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
4189 sctp_flight_size_increase(tp1);
4190 sctp_total_flight_increase(stcb, tp1);
4191 } else if (tp1->sent == SCTP_DATAGRAM_RESEND) {
4192 sctp_ucount_incr(asoc->sent_queue_retran_cnt);
4199 /**********************************/
4200 /* Now what about shutdown issues */
4201 /**********************************/
4202 if (TAILQ_EMPTY(&asoc->send_queue) && TAILQ_EMPTY(&asoc->sent_queue)) {
4203 /* nothing left on sendqueue.. consider done */
4205 if ((asoc->stream_queue_cnt == 1) &&
4206 ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
4207 (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED)) &&
4208 ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc))) {
4209 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
4211 if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) &&
4212 (asoc->stream_queue_cnt == 0)) {
4213 if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) {
4214 /* Need to abort here */
4215 struct mbuf *op_err;
4220 op_err = sctp_generate_cause(SCTP_CAUSE_USER_INITIATED_ABT, "");
4221 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_24;
4222 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
4225 struct sctp_nets *netp;
4227 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
4228 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
4229 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
4231 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
4232 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
4233 sctp_stop_timers_for_shutdown(stcb);
4234 if (asoc->alternate) {
4235 netp = asoc->alternate;
4237 netp = asoc->primary_destination;
4239 sctp_send_shutdown(stcb, netp);
4240 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
4241 stcb->sctp_ep, stcb, netp);
4242 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
4243 stcb->sctp_ep, stcb, netp);
4245 } else if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) &&
4246 (asoc->stream_queue_cnt == 0)) {
4247 struct sctp_nets *netp;
4249 if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) {
4252 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
4253 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
4254 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
4255 sctp_stop_timers_for_shutdown(stcb);
4256 if (asoc->alternate) {
4257 netp = asoc->alternate;
4259 netp = asoc->primary_destination;
4261 sctp_send_shutdown_ack(stcb, netp);
4262 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
4263 stcb->sctp_ep, stcb, netp);
4266 /*********************************************/
4267 /* Here we perform PR-SCTP procedures */
4269 /*********************************************/
4270 /* C1. update advancedPeerAckPoint */
4271 if (SCTP_TSN_GT(cumack, asoc->advanced_peer_ack_point)) {
4272 asoc->advanced_peer_ack_point = cumack;
4274 /* PR-Sctp issues need to be addressed too */
4275 if ((asoc->prsctp_supported) && (asoc->pr_sctp_cnt > 0)) {
4276 struct sctp_tmit_chunk *lchk;
4277 uint32_t old_adv_peer_ack_point;
4279 old_adv_peer_ack_point = asoc->advanced_peer_ack_point;
4280 lchk = sctp_try_advance_peer_ack_point(stcb, asoc);
4281 /* C3. See if we need to send a Fwd-TSN */
4282 if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, cumack)) {
4284 * ISSUE with ECN, see FWD-TSN processing.
4286 if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, old_adv_peer_ack_point)) {
4287 send_forward_tsn(stcb, asoc);
4289 /* try to FR fwd-tsn's that get lost too */
4290 if (lchk->rec.data.fwd_tsn_cnt >= 3) {
4291 send_forward_tsn(stcb, asoc);
4296 /* Assure a timer is up */
4297 sctp_timer_start(SCTP_TIMER_TYPE_SEND,
4298 stcb->sctp_ep, stcb, lchk->whoTo);
4301 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_RWND_LOGGING_ENABLE) {
4302 sctp_misc_ints(SCTP_SACK_RWND_UPDATE,
4304 stcb->asoc.peers_rwnd,
4305 stcb->asoc.total_flight,
4306 stcb->asoc.total_output_queue_size);
4311 sctp_handle_sack(struct mbuf *m, int offset_seg, int offset_dup,
4312 struct sctp_tcb *stcb,
4313 uint16_t num_seg, uint16_t num_nr_seg, uint16_t num_dup,
4314 int *abort_now, uint8_t flags,
4315 uint32_t cum_ack, uint32_t rwnd, int ecne_seen)
4317 struct sctp_association *asoc;
4318 struct sctp_tmit_chunk *tp1, *tp2;
4319 uint32_t last_tsn, biggest_tsn_acked, biggest_tsn_newly_acked, this_sack_lowest_newack;
4320 uint16_t wake_him = 0;
4321 uint32_t send_s = 0;
4323 int accum_moved = 0;
4324 int will_exit_fast_recovery = 0;
4325 uint32_t a_rwnd, old_rwnd;
4326 int win_probe_recovery = 0;
4327 int win_probe_recovered = 0;
4328 struct sctp_nets *net = NULL;
4331 uint8_t reneged_all = 0;
4332 uint8_t cmt_dac_flag;
4335 * we take any chance we can to service our queues since we cannot
4336 * get awoken when the socket is read from :<
4339 * Now perform the actual SACK handling: 1) Verify that it is not an
4340 * old sack, if so discard. 2) If there is nothing left in the send
4341 * queue (cum-ack is equal to last acked) then you have a duplicate
4342 * too, update any rwnd change and verify no timers are running.
4343 * then return. 3) Process any new consequtive data i.e. cum-ack
4344 * moved process these first and note that it moved. 4) Process any
4345 * sack blocks. 5) Drop any acked from the queue. 6) Check for any
4346 * revoked blocks and mark. 7) Update the cwnd. 8) Nothing left,
4347 * sync up flightsizes and things, stop all timers and also check
4348 * for shutdown_pending state. If so then go ahead and send off the
4349 * shutdown. If in shutdown recv, send off the shutdown-ack and
4350 * start that timer, Ret. 9) Strike any non-acked things and do FR
4351 * procedure if needed being sure to set the FR flag. 10) Do pr-sctp
4352 * procedures. 11) Apply any FR penalties. 12) Assure we will SACK
4353 * if in shutdown_recv state.
4355 SCTP_TCB_LOCK_ASSERT(stcb);
4357 this_sack_lowest_newack = 0;
4358 SCTP_STAT_INCR(sctps_slowpath_sack);
4360 cmt_dac_flag = flags & SCTP_SACK_CMT_DAC;
4361 #ifdef SCTP_ASOCLOG_OF_TSNS
4362 stcb->asoc.cumack_log[stcb->asoc.cumack_log_at] = cum_ack;
4363 stcb->asoc.cumack_log_at++;
4364 if (stcb->asoc.cumack_log_at > SCTP_TSN_LOG_SIZE) {
4365 stcb->asoc.cumack_log_at = 0;
4370 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_SACK_ARRIVALS_ENABLE) {
4371 sctp_misc_ints(SCTP_SACK_LOG_NORMAL, cum_ack,
4372 rwnd, stcb->asoc.last_acked_seq, stcb->asoc.peers_rwnd);
4374 old_rwnd = stcb->asoc.peers_rwnd;
4375 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4376 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4377 stcb->asoc.overall_error_count,
4379 SCTP_FROM_SCTP_INDATA,
4382 stcb->asoc.overall_error_count = 0;
4384 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
4385 sctp_log_sack(asoc->last_acked_seq,
4392 if ((num_dup) && (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE)) {
4394 uint32_t *dupdata, dblock;
4396 for (i = 0; i < num_dup; i++) {
4397 dupdata = (uint32_t *) sctp_m_getptr(m, offset_dup + i * sizeof(uint32_t),
4398 sizeof(uint32_t), (uint8_t *) & dblock);
4399 if (dupdata == NULL) {
4402 sctp_log_fr(*dupdata, 0, 0, SCTP_FR_DUPED);
4406 if (!TAILQ_EMPTY(&asoc->sent_queue)) {
4407 tp1 = TAILQ_LAST(&asoc->sent_queue,
4408 sctpchunk_listhead);
4409 send_s = tp1->rec.data.TSN_seq + 1;
4412 send_s = asoc->sending_seq;
4414 if (SCTP_TSN_GE(cum_ack, send_s)) {
4415 struct mbuf *op_err;
4416 char msg[SCTP_DIAG_INFO_LEN];
4419 * no way, we have not even sent this TSN out yet. Peer is
4420 * hopelessly messed up with us.
4422 SCTP_PRINTF("NEW cum_ack:%x send_s:%x is smaller or equal\n",
4425 SCTP_PRINTF("Got send_s from tsn:%x + 1 of tp1: %p\n",
4426 tp1->rec.data.TSN_seq, (void *)tp1);
4431 snprintf(msg, sizeof(msg), "Cum ack %8.8x greater or equal than TSN %8.8x",
4433 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
4434 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_25;
4435 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
4438 /**********************/
4439 /* 1) check the range */
4440 /**********************/
4441 if (SCTP_TSN_GT(asoc->last_acked_seq, last_tsn)) {
4442 /* acking something behind */
4445 /* update the Rwnd of the peer */
4446 if (TAILQ_EMPTY(&asoc->sent_queue) &&
4447 TAILQ_EMPTY(&asoc->send_queue) &&
4448 (asoc->stream_queue_cnt == 0)) {
4449 /* nothing left on send/sent and strmq */
4450 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
4451 sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK,
4452 asoc->peers_rwnd, 0, 0, a_rwnd);
4454 asoc->peers_rwnd = a_rwnd;
4455 if (asoc->sent_queue_retran_cnt) {
4456 asoc->sent_queue_retran_cnt = 0;
4458 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4459 /* SWS sender side engages */
4460 asoc->peers_rwnd = 0;
4462 /* stop any timers */
4463 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4464 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
4465 stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_26);
4466 net->partial_bytes_acked = 0;
4467 net->flight_size = 0;
4469 asoc->total_flight = 0;
4470 asoc->total_flight_count = 0;
4474 * We init netAckSz and netAckSz2 to 0. These are used to track 2
4475 * things. The total byte count acked is tracked in netAckSz AND
4476 * netAck2 is used to track the total bytes acked that are un-
4477 * amibguious and were never retransmitted. We track these on a per
4478 * destination address basis.
4480 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4481 if (SCTP_TSN_GT(cum_ack, net->cwr_window_tsn)) {
4482 /* Drag along the window_tsn for cwr's */
4483 net->cwr_window_tsn = cum_ack;
4485 net->prev_cwnd = net->cwnd;
4490 * CMT: Reset CUC and Fast recovery algo variables before
4493 net->new_pseudo_cumack = 0;
4494 net->will_exit_fast_recovery = 0;
4495 if (stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack) {
4496 (*stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack) (stcb, net);
4499 /* process the new consecutive TSN first */
4500 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
4501 if (SCTP_TSN_GE(last_tsn, tp1->rec.data.TSN_seq)) {
4502 if (tp1->sent != SCTP_DATAGRAM_UNSENT) {
4504 if (tp1->sent < SCTP_DATAGRAM_ACKED) {
4506 * If it is less than ACKED, it is
4507 * now no-longer in flight. Higher
4508 * values may occur during marking
4510 if ((tp1->whoTo->dest_state &
4511 SCTP_ADDR_UNCONFIRMED) &&
4512 (tp1->snd_count < 2)) {
4514 * If there was no retran
4515 * and the address is
4516 * un-confirmed and we sent
4518 * sacked.. its confirmed,
4521 tp1->whoTo->dest_state &=
4522 ~SCTP_ADDR_UNCONFIRMED;
4524 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
4525 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
4526 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_CA,
4527 tp1->whoTo->flight_size,
4529 (uint32_t) (uintptr_t) tp1->whoTo,
4530 tp1->rec.data.TSN_seq);
4532 sctp_flight_size_decrease(tp1);
4533 sctp_total_flight_decrease(stcb, tp1);
4534 if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) {
4535 (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo,
4539 tp1->whoTo->net_ack += tp1->send_size;
4541 /* CMT SFR and DAC algos */
4542 this_sack_lowest_newack = tp1->rec.data.TSN_seq;
4543 tp1->whoTo->saw_newack = 1;
4545 if (tp1->snd_count < 2) {
4547 * True non-retransmited
4550 tp1->whoTo->net_ack2 +=
4553 /* update RTO too? */
4557 sctp_calculate_rto(stcb,
4559 &tp1->sent_rcv_time,
4560 sctp_align_safe_nocopy,
4561 SCTP_RTT_FROM_DATA);
4564 if (tp1->whoTo->rto_needed == 0) {
4565 tp1->whoTo->rto_needed = 1;
4571 * CMT: CUCv2 algorithm. From the
4572 * cumack'd TSNs, for each TSN being
4573 * acked for the first time, set the
4574 * following variables for the
4575 * corresp destination.
4576 * new_pseudo_cumack will trigger a
4578 * find_(rtx_)pseudo_cumack will
4579 * trigger search for the next
4580 * expected (rtx-)pseudo-cumack.
4582 tp1->whoTo->new_pseudo_cumack = 1;
4583 tp1->whoTo->find_pseudo_cumack = 1;
4584 tp1->whoTo->find_rtx_pseudo_cumack = 1;
4587 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
4588 sctp_log_sack(asoc->last_acked_seq,
4590 tp1->rec.data.TSN_seq,
4593 SCTP_LOG_TSN_ACKED);
4595 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
4596 sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK);
4599 if (tp1->sent == SCTP_DATAGRAM_RESEND) {
4600 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
4601 #ifdef SCTP_AUDITING_ENABLED
4602 sctp_audit_log(0xB3,
4603 (asoc->sent_queue_retran_cnt & 0x000000ff));
4606 if (tp1->rec.data.chunk_was_revoked) {
4607 /* deflate the cwnd */
4608 tp1->whoTo->cwnd -= tp1->book_size;
4609 tp1->rec.data.chunk_was_revoked = 0;
4611 if (tp1->sent != SCTP_DATAGRAM_NR_ACKED) {
4612 tp1->sent = SCTP_DATAGRAM_ACKED;
4619 biggest_tsn_newly_acked = biggest_tsn_acked = last_tsn;
4620 /* always set this up to cum-ack */
4621 asoc->this_sack_highest_gap = last_tsn;
4623 if ((num_seg > 0) || (num_nr_seg > 0)) {
4626 * CMT: SFR algo (and HTNA) - this_sack_highest_newack has
4627 * to be greater than the cumack. Also reset saw_newack to 0
4630 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4631 net->saw_newack = 0;
4632 net->this_sack_highest_newack = last_tsn;
4636 * thisSackHighestGap will increase while handling NEW
4637 * segments this_sack_highest_newack will increase while
4638 * handling NEWLY ACKED chunks. this_sack_lowest_newack is
4639 * used for CMT DAC algo. saw_newack will also change.
4641 if (sctp_handle_segments(m, &offset_seg, stcb, asoc, last_tsn, &biggest_tsn_acked,
4642 &biggest_tsn_newly_acked, &this_sack_lowest_newack,
4643 num_seg, num_nr_seg, &rto_ok)) {
4647 * validate the biggest_tsn_acked in the gap acks if strict
4648 * adherence is wanted.
4650 if (SCTP_TSN_GE(biggest_tsn_acked, send_s)) {
4652 * peer is either confused or we are under attack.
4655 SCTP_PRINTF("Hopeless peer! biggest_tsn_acked:%x largest seq:%x\n",
4656 biggest_tsn_acked, send_s);
4660 /*******************************************/
4661 /* cancel ALL T3-send timer if accum moved */
4662 /*******************************************/
4663 if (asoc->sctp_cmt_on_off > 0) {
4664 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4665 if (net->new_pseudo_cumack)
4666 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
4668 SCTP_FROM_SCTP_INDATA + SCTP_LOC_27);
4673 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4674 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
4675 stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_28);
4679 /********************************************/
4680 /* drop the acked chunks from the sentqueue */
4681 /********************************************/
4682 asoc->last_acked_seq = cum_ack;
4684 TAILQ_FOREACH_SAFE(tp1, &asoc->sent_queue, sctp_next, tp2) {
4685 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, cum_ack)) {
4688 if (tp1->sent != SCTP_DATAGRAM_NR_ACKED) {
4689 if (asoc->strmout[tp1->rec.data.stream_number].chunks_on_queues > 0) {
4690 asoc->strmout[tp1->rec.data.stream_number].chunks_on_queues--;
4693 panic("No chunks on the queues for sid %u.", tp1->rec.data.stream_number);
4697 if ((asoc->strmout[tp1->rec.data.stream_number].chunks_on_queues == 0) &&
4698 (asoc->strmout[tp1->rec.data.stream_number].state == SCTP_STREAM_RESET_PENDING) &&
4699 TAILQ_EMPTY(&asoc->strmout[tp1->rec.data.stream_number].outqueue)) {
4700 asoc->trigger_reset = 1;
4702 TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next);
4703 if (PR_SCTP_ENABLED(tp1->flags)) {
4704 if (asoc->pr_sctp_cnt != 0)
4705 asoc->pr_sctp_cnt--;
4707 asoc->sent_queue_cnt--;
4709 /* sa_ignore NO_NULL_CHK */
4710 sctp_free_bufspace(stcb, asoc, tp1, 1);
4711 sctp_m_freem(tp1->data);
4713 if (asoc->prsctp_supported && PR_SCTP_BUF_ENABLED(tp1->flags)) {
4714 asoc->sent_queue_cnt_removeable--;
4717 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
4718 sctp_log_sack(asoc->last_acked_seq,
4720 tp1->rec.data.TSN_seq,
4723 SCTP_LOG_FREE_SENT);
4725 sctp_free_a_chunk(stcb, tp1, SCTP_SO_NOT_LOCKED);
4728 if (TAILQ_EMPTY(&asoc->sent_queue) && (asoc->total_flight > 0)) {
4730 panic("Warning flight size is positive and should be 0");
4732 SCTP_PRINTF("Warning flight size incorrect should be 0 is %d\n",
4733 asoc->total_flight);
4735 asoc->total_flight = 0;
4737 /* sa_ignore NO_NULL_CHK */
4738 if ((wake_him) && (stcb->sctp_socket)) {
4739 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4743 SOCKBUF_LOCK(&stcb->sctp_socket->so_snd);
4744 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) {
4745 sctp_wakeup_log(stcb, wake_him, SCTP_WAKESND_FROM_SACK);
4747 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4748 so = SCTP_INP_SO(stcb->sctp_ep);
4749 atomic_add_int(&stcb->asoc.refcnt, 1);
4750 SCTP_TCB_UNLOCK(stcb);
4751 SCTP_SOCKET_LOCK(so, 1);
4752 SCTP_TCB_LOCK(stcb);
4753 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4754 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
4755 /* assoc was freed while we were unlocked */
4756 SCTP_SOCKET_UNLOCK(so, 1);
4760 sctp_sowwakeup_locked(stcb->sctp_ep, stcb->sctp_socket);
4761 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4762 SCTP_SOCKET_UNLOCK(so, 1);
4765 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) {
4766 sctp_wakeup_log(stcb, wake_him, SCTP_NOWAKE_FROM_SACK);
4770 if (asoc->fast_retran_loss_recovery && accum_moved) {
4771 if (SCTP_TSN_GE(asoc->last_acked_seq, asoc->fast_recovery_tsn)) {
4772 /* Setup so we will exit RFC2582 fast recovery */
4773 will_exit_fast_recovery = 1;
4777 * Check for revoked fragments:
4779 * if Previous sack - Had no frags then we can't have any revoked if
4780 * Previous sack - Had frag's then - If we now have frags aka
4781 * num_seg > 0 call sctp_check_for_revoked() to tell if peer revoked
4782 * some of them. else - The peer revoked all ACKED fragments, since
4783 * we had some before and now we have NONE.
4787 sctp_check_for_revoked(stcb, asoc, cum_ack, biggest_tsn_acked);
4788 asoc->saw_sack_with_frags = 1;
4789 } else if (asoc->saw_sack_with_frags) {
4790 int cnt_revoked = 0;
4792 /* Peer revoked all dg's marked or acked */
4793 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
4794 if (tp1->sent == SCTP_DATAGRAM_ACKED) {
4795 tp1->sent = SCTP_DATAGRAM_SENT;
4796 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
4797 sctp_misc_ints(SCTP_FLIGHT_LOG_UP_REVOKE,
4798 tp1->whoTo->flight_size,
4800 (uint32_t) (uintptr_t) tp1->whoTo,
4801 tp1->rec.data.TSN_seq);
4803 sctp_flight_size_increase(tp1);
4804 sctp_total_flight_increase(stcb, tp1);
4805 tp1->rec.data.chunk_was_revoked = 1;
4807 * To ensure that this increase in
4808 * flightsize, which is artificial, does not
4809 * throttle the sender, we also increase the
4810 * cwnd artificially.
4812 tp1->whoTo->cwnd += tp1->book_size;
4819 asoc->saw_sack_with_frags = 0;
4822 asoc->saw_sack_with_nr_frags = 1;
4824 asoc->saw_sack_with_nr_frags = 0;
4826 /* JRS - Use the congestion control given in the CC module */
4827 if (ecne_seen == 0) {
4828 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4829 if (net->net_ack2 > 0) {
4831 * Karn's rule applies to clearing error
4832 * count, this is optional.
4834 net->error_count = 0;
4835 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
4836 /* addr came good */
4837 net->dest_state |= SCTP_ADDR_REACHABLE;
4838 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
4839 0, (void *)net, SCTP_SO_NOT_LOCKED);
4841 if (net == stcb->asoc.primary_destination) {
4842 if (stcb->asoc.alternate) {
4844 * release the alternate,
4847 sctp_free_remote_addr(stcb->asoc.alternate);
4848 stcb->asoc.alternate = NULL;
4851 if (net->dest_state & SCTP_ADDR_PF) {
4852 net->dest_state &= ~SCTP_ADDR_PF;
4853 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT,
4854 stcb->sctp_ep, stcb, net,
4855 SCTP_FROM_SCTP_INDATA + SCTP_LOC_29);
4856 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
4857 asoc->cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
4858 /* Done with this net */
4861 /* restore any doubled timers */
4862 net->RTO = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv;
4863 if (net->RTO < stcb->asoc.minrto) {
4864 net->RTO = stcb->asoc.minrto;
4866 if (net->RTO > stcb->asoc.maxrto) {
4867 net->RTO = stcb->asoc.maxrto;
4871 asoc->cc_functions.sctp_cwnd_update_after_sack(stcb, asoc, accum_moved, reneged_all, will_exit_fast_recovery);
4873 if (TAILQ_EMPTY(&asoc->sent_queue)) {
4874 /* nothing left in-flight */
4875 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4876 /* stop all timers */
4877 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
4879 SCTP_FROM_SCTP_INDATA + SCTP_LOC_30);
4880 net->flight_size = 0;
4881 net->partial_bytes_acked = 0;
4883 asoc->total_flight = 0;
4884 asoc->total_flight_count = 0;
4886 /**********************************/
4887 /* Now what about shutdown issues */
4888 /**********************************/
4889 if (TAILQ_EMPTY(&asoc->send_queue) && TAILQ_EMPTY(&asoc->sent_queue)) {
4890 /* nothing left on sendqueue.. consider done */
4891 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
4892 sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK,
4893 asoc->peers_rwnd, 0, 0, a_rwnd);
4895 asoc->peers_rwnd = a_rwnd;
4896 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4897 /* SWS sender side engages */
4898 asoc->peers_rwnd = 0;
4901 if ((asoc->stream_queue_cnt == 1) &&
4902 ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
4903 (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED)) &&
4904 ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc))) {
4905 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
4907 if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) &&
4908 (asoc->stream_queue_cnt == 0)) {
4909 if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) {
4910 /* Need to abort here */
4911 struct mbuf *op_err;
4916 op_err = sctp_generate_cause(SCTP_CAUSE_USER_INITIATED_ABT, "");
4917 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_31;
4918 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
4921 struct sctp_nets *netp;
4923 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
4924 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
4925 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
4927 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
4928 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
4929 sctp_stop_timers_for_shutdown(stcb);
4930 if (asoc->alternate) {
4931 netp = asoc->alternate;
4933 netp = asoc->primary_destination;
4935 sctp_send_shutdown(stcb, netp);
4936 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
4937 stcb->sctp_ep, stcb, netp);
4938 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
4939 stcb->sctp_ep, stcb, netp);
4942 } else if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) &&
4943 (asoc->stream_queue_cnt == 0)) {
4944 struct sctp_nets *netp;
4946 if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) {
4949 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
4950 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
4951 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
4952 sctp_stop_timers_for_shutdown(stcb);
4953 if (asoc->alternate) {
4954 netp = asoc->alternate;
4956 netp = asoc->primary_destination;
4958 sctp_send_shutdown_ack(stcb, netp);
4959 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
4960 stcb->sctp_ep, stcb, netp);
4965 * Now here we are going to recycle net_ack for a different use...
4968 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4973 * CMT DAC algorithm: If SACK DAC flag was 0, then no extra marking
4974 * to be done. Setting this_sack_lowest_newack to the cum_ack will
4975 * automatically ensure that.
4977 if ((asoc->sctp_cmt_on_off > 0) &&
4978 SCTP_BASE_SYSCTL(sctp_cmt_use_dac) &&
4979 (cmt_dac_flag == 0)) {
4980 this_sack_lowest_newack = cum_ack;
4982 if ((num_seg > 0) || (num_nr_seg > 0)) {
4983 sctp_strike_gap_ack_chunks(stcb, asoc, biggest_tsn_acked,
4984 biggest_tsn_newly_acked, this_sack_lowest_newack, accum_moved);
4986 /* JRS - Use the congestion control given in the CC module */
4987 asoc->cc_functions.sctp_cwnd_update_after_fr(stcb, asoc);
4989 /* Now are we exiting loss recovery ? */
4990 if (will_exit_fast_recovery) {
4991 /* Ok, we must exit fast recovery */
4992 asoc->fast_retran_loss_recovery = 0;
4994 if ((asoc->sat_t3_loss_recovery) &&
4995 SCTP_TSN_GE(asoc->last_acked_seq, asoc->sat_t3_recovery_tsn)) {
4996 /* end satellite t3 loss recovery */
4997 asoc->sat_t3_loss_recovery = 0;
5002 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5003 if (net->will_exit_fast_recovery) {
5004 /* Ok, we must exit fast recovery */
5005 net->fast_retran_loss_recovery = 0;
5009 /* Adjust and set the new rwnd value */
5010 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
5011 sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK,
5012 asoc->peers_rwnd, asoc->total_flight, (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)), a_rwnd);
5014 asoc->peers_rwnd = sctp_sbspace_sub(a_rwnd,
5015 (uint32_t) (asoc->total_flight + (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh))));
5016 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
5017 /* SWS sender side engages */
5018 asoc->peers_rwnd = 0;
5020 if (asoc->peers_rwnd > old_rwnd) {
5021 win_probe_recovery = 1;
5024 * Now we must setup so we have a timer up for anyone with
5030 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5031 if (win_probe_recovery && (net->window_probe)) {
5032 win_probe_recovered = 1;
5034 * Find first chunk that was used with
5035 * window probe and clear the event. Put
5036 * it back into the send queue as if has
5039 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
5040 if (tp1->window_probe) {
5041 sctp_window_probe_recovery(stcb, asoc, tp1);
5046 if (net->flight_size) {
5048 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
5049 sctp_timer_start(SCTP_TIMER_TYPE_SEND,
5050 stcb->sctp_ep, stcb, net);
5052 if (net->window_probe) {
5053 net->window_probe = 0;
5056 if (net->window_probe) {
5058 * In window probes we must assure a timer
5059 * is still running there
5061 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
5062 sctp_timer_start(SCTP_TIMER_TYPE_SEND,
5063 stcb->sctp_ep, stcb, net);
5066 } else if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
5067 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
5069 SCTP_FROM_SCTP_INDATA + SCTP_LOC_32);
5074 (!TAILQ_EMPTY(&asoc->sent_queue)) &&
5075 (asoc->sent_queue_retran_cnt == 0) &&
5076 (win_probe_recovered == 0) &&
5079 * huh, this should not happen unless all packets are
5080 * PR-SCTP and marked to skip of course.
5082 if (sctp_fs_audit(asoc)) {
5083 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5084 net->flight_size = 0;
5086 asoc->total_flight = 0;
5087 asoc->total_flight_count = 0;
5088 asoc->sent_queue_retran_cnt = 0;
5089 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
5090 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
5091 sctp_flight_size_increase(tp1);
5092 sctp_total_flight_increase(stcb, tp1);
5093 } else if (tp1->sent == SCTP_DATAGRAM_RESEND) {
5094 sctp_ucount_incr(asoc->sent_queue_retran_cnt);
5101 /*********************************************/
5102 /* Here we perform PR-SCTP procedures */
5104 /*********************************************/
5105 /* C1. update advancedPeerAckPoint */
5106 if (SCTP_TSN_GT(cum_ack, asoc->advanced_peer_ack_point)) {
5107 asoc->advanced_peer_ack_point = cum_ack;
5109 /* C2. try to further move advancedPeerAckPoint ahead */
5110 if ((asoc->prsctp_supported) && (asoc->pr_sctp_cnt > 0)) {
5111 struct sctp_tmit_chunk *lchk;
5112 uint32_t old_adv_peer_ack_point;
5114 old_adv_peer_ack_point = asoc->advanced_peer_ack_point;
5115 lchk = sctp_try_advance_peer_ack_point(stcb, asoc);
5116 /* C3. See if we need to send a Fwd-TSN */
5117 if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, cum_ack)) {
5119 * ISSUE with ECN, see FWD-TSN processing.
5121 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
5122 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
5123 0xee, cum_ack, asoc->advanced_peer_ack_point,
5124 old_adv_peer_ack_point);
5126 if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, old_adv_peer_ack_point)) {
5127 send_forward_tsn(stcb, asoc);
5129 /* try to FR fwd-tsn's that get lost too */
5130 if (lchk->rec.data.fwd_tsn_cnt >= 3) {
5131 send_forward_tsn(stcb, asoc);
5136 /* Assure a timer is up */
5137 sctp_timer_start(SCTP_TIMER_TYPE_SEND,
5138 stcb->sctp_ep, stcb, lchk->whoTo);
5141 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_RWND_LOGGING_ENABLE) {
5142 sctp_misc_ints(SCTP_SACK_RWND_UPDATE,
5144 stcb->asoc.peers_rwnd,
5145 stcb->asoc.total_flight,
5146 stcb->asoc.total_output_queue_size);
5151 sctp_update_acked(struct sctp_tcb *stcb, struct sctp_shutdown_chunk *cp, int *abort_flag)
5154 uint32_t cum_ack, a_rwnd;
5156 cum_ack = ntohl(cp->cumulative_tsn_ack);
5157 /* Arrange so a_rwnd does NOT change */
5158 a_rwnd = stcb->asoc.peers_rwnd + stcb->asoc.total_flight;
5160 /* Now call the express sack handling */
5161 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, abort_flag, 0);
5165 sctp_kick_prsctp_reorder_queue(struct sctp_tcb *stcb,
5166 struct sctp_stream_in *strmin)
5168 struct sctp_queued_to_read *ctl, *nctl;
5169 struct sctp_association *asoc;
5171 int need_reasm_check = 0, old;
5174 tt = strmin->last_sequence_delivered;
5175 if (asoc->idata_supported) {
5181 * First deliver anything prior to and including the stream no that
5184 TAILQ_FOREACH_SAFE(ctl, &strmin->inqueue, next_instrm, nctl) {
5185 if (SCTP_MSGID_GE(old, tt, ctl->sinfo_ssn)) {
5186 /* this is deliverable now */
5187 if (((ctl->sinfo_flags >> 8) & SCTP_DATA_NOT_FRAG) == SCTP_DATA_NOT_FRAG) {
5188 if (ctl->on_strm_q) {
5189 if (ctl->on_strm_q == SCTP_ON_ORDERED) {
5190 TAILQ_REMOVE(&strmin->inqueue, ctl, next_instrm);
5191 } else if (ctl->on_strm_q == SCTP_ON_UNORDERED) {
5192 TAILQ_REMOVE(&strmin->uno_inqueue, ctl, next_instrm);
5195 panic("strmin: %p ctl: %p unknown %d",
5196 strmin, ctl, ctl->on_strm_q);
5201 /* subtract pending on streams */
5202 asoc->size_on_all_streams -= ctl->length;
5203 sctp_ucount_decr(asoc->cnt_on_all_streams);
5204 /* deliver it to at least the delivery-q */
5205 if (stcb->sctp_socket) {
5206 sctp_mark_non_revokable(asoc, ctl->sinfo_tsn);
5207 sctp_add_to_readq(stcb->sctp_ep, stcb,
5209 &stcb->sctp_socket->so_rcv,
5210 1, SCTP_READ_LOCK_HELD,
5211 SCTP_SO_NOT_LOCKED);
5214 /* Its a fragmented message */
5215 if (ctl->first_frag_seen) {
5217 * Make it so this is next to
5218 * deliver, we restore later
5220 strmin->last_sequence_delivered = ctl->sinfo_ssn - 1;
5221 need_reasm_check = 1;
5226 /* no more delivery now. */
5230 if (need_reasm_check) {
5233 ret = sctp_deliver_reasm_check(stcb, &stcb->asoc, strmin, SCTP_READ_LOCK_HELD);
5234 if (SCTP_MSGID_GT(old, tt, strmin->last_sequence_delivered)) {
5235 /* Restore the next to deliver unless we are ahead */
5236 strmin->last_sequence_delivered = tt;
5239 /* Left the front Partial one on */
5242 need_reasm_check = 0;
5245 * now we must deliver things in queue the normal way if any are
5248 tt = strmin->last_sequence_delivered + 1;
5249 TAILQ_FOREACH_SAFE(ctl, &strmin->inqueue, next_instrm, nctl) {
5250 if (tt == ctl->sinfo_ssn) {
5251 if (((ctl->sinfo_flags >> 8) & SCTP_DATA_NOT_FRAG) == SCTP_DATA_NOT_FRAG) {
5252 /* this is deliverable now */
5253 if (ctl->on_strm_q) {
5254 if (ctl->on_strm_q == SCTP_ON_ORDERED) {
5255 TAILQ_REMOVE(&strmin->inqueue, ctl, next_instrm);
5256 } else if (ctl->on_strm_q == SCTP_ON_UNORDERED) {
5257 TAILQ_REMOVE(&strmin->uno_inqueue, ctl, next_instrm);
5260 panic("strmin: %p ctl: %p unknown %d",
5261 strmin, ctl, ctl->on_strm_q);
5266 /* subtract pending on streams */
5267 asoc->size_on_all_streams -= ctl->length;
5268 sctp_ucount_decr(asoc->cnt_on_all_streams);
5269 /* deliver it to at least the delivery-q */
5270 strmin->last_sequence_delivered = ctl->sinfo_ssn;
5271 if (stcb->sctp_socket) {
5272 sctp_mark_non_revokable(asoc, ctl->sinfo_tsn);
5273 sctp_add_to_readq(stcb->sctp_ep, stcb,
5275 &stcb->sctp_socket->so_rcv, 1,
5276 SCTP_READ_LOCK_HELD, SCTP_SO_NOT_LOCKED);
5279 tt = strmin->last_sequence_delivered + 1;
5281 /* Its a fragmented message */
5282 if (ctl->first_frag_seen) {
5284 * Make it so this is next to
5287 strmin->last_sequence_delivered = ctl->sinfo_ssn - 1;
5288 need_reasm_check = 1;
5296 if (need_reasm_check) {
5297 (void)sctp_deliver_reasm_check(stcb, &stcb->asoc, strmin, SCTP_READ_LOCK_HELD);
5304 sctp_flush_reassm_for_str_seq(struct sctp_tcb *stcb,
5305 struct sctp_association *asoc,
5306 uint16_t stream, uint32_t seq, int ordered, int old, uint32_t cumtsn)
5308 struct sctp_queued_to_read *control;
5309 struct sctp_stream_in *strm;
5310 struct sctp_tmit_chunk *chk, *nchk;
5311 int cnt_removed = 0;
5314 * For now large messages held on the stream reasm that are complete
5315 * will be tossed too. We could in theory do more work to spin
5316 * through and stop after dumping one msg aka seeing the start of a
5317 * new msg at the head, and call the delivery function... to see if
5318 * it can be delivered... But for now we just dump everything on the
5321 strm = &asoc->strmin[stream];
5322 control = sctp_find_reasm_entry(strm, (uint32_t) seq, ordered, old);
5323 if (control == NULL) {
5327 if (old && !ordered && SCTP_TSN_GT(control->fsn_included, cumtsn)) {
5330 TAILQ_FOREACH_SAFE(chk, &control->reasm, sctp_next, nchk) {
5331 /* Purge hanging chunks */
5332 if (old && (ordered == 0)) {
5333 if (SCTP_TSN_GT(chk->rec.data.TSN_seq, cumtsn)) {
5338 TAILQ_REMOVE(&control->reasm, chk, sctp_next);
5339 asoc->size_on_reasm_queue -= chk->send_size;
5340 sctp_ucount_decr(asoc->cnt_on_reasm_queue);
5342 sctp_m_freem(chk->data);
5345 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
5347 if (!TAILQ_EMPTY(&control->reasm)) {
5348 /* This has to be old data, unordered */
5349 if (control->data) {
5350 sctp_m_freem(control->data);
5351 control->data = NULL;
5353 sctp_reset_a_control(control, stcb->sctp_ep, cumtsn);
5354 chk = TAILQ_FIRST(&control->reasm);
5355 if (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) {
5356 TAILQ_REMOVE(&control->reasm, chk, sctp_next);
5357 sctp_add_chk_to_control(control, strm, stcb, asoc,
5358 chk, SCTP_READ_LOCK_HELD);
5360 sctp_deliver_reasm_check(stcb, asoc, strm, SCTP_READ_LOCK_HELD);
5363 if (control->on_strm_q == SCTP_ON_ORDERED) {
5364 TAILQ_REMOVE(&strm->inqueue, control, next_instrm);
5365 control->on_strm_q = 0;
5366 } else if (control->on_strm_q == SCTP_ON_UNORDERED) {
5367 TAILQ_REMOVE(&strm->uno_inqueue, control, next_instrm);
5368 control->on_strm_q = 0;
5370 } else if (control->on_strm_q) {
5371 panic("strm: %p ctl: %p unknown %d",
5372 strm, control, control->on_strm_q);
5375 control->on_strm_q = 0;
5376 if (control->on_read_q == 0) {
5377 sctp_free_remote_addr(control->whoFrom);
5378 if (control->data) {
5379 sctp_m_freem(control->data);
5380 control->data = NULL;
5382 sctp_free_a_readq(stcb, control);
5387 sctp_handle_forward_tsn(struct sctp_tcb *stcb,
5388 struct sctp_forward_tsn_chunk *fwd,
5389 int *abort_flag, struct mbuf *m, int offset)
5391 /* The pr-sctp fwd tsn */
5393 * here we will perform all the data receiver side steps for
5394 * processing FwdTSN, as required in by pr-sctp draft:
5396 * Assume we get FwdTSN(x):
5398 * 1) update local cumTSN to x 2) try to further advance cumTSN to x +
5399 * others we have 3) examine and update re-ordering queue on
5400 * pr-in-streams 4) clean up re-assembly queue 5) Send a sack to
5401 * report where we are.
5403 struct sctp_association *asoc;
5404 uint32_t new_cum_tsn, gap;
5405 unsigned int i, fwd_sz, m_size;
5407 struct sctp_stream_in *strm;
5408 struct sctp_queued_to_read *ctl, *sv;
5411 if ((fwd_sz = ntohs(fwd->ch.chunk_length)) < sizeof(struct sctp_forward_tsn_chunk)) {
5412 SCTPDBG(SCTP_DEBUG_INDATA1,
5413 "Bad size too small/big fwd-tsn\n");
5416 m_size = (stcb->asoc.mapping_array_size << 3);
5417 /*************************************************************/
5418 /* 1. Here we update local cumTSN and shift the bitmap array */
5419 /*************************************************************/
5420 new_cum_tsn = ntohl(fwd->new_cumulative_tsn);
5422 if (SCTP_TSN_GE(asoc->cumulative_tsn, new_cum_tsn)) {
5423 /* Already got there ... */
5427 * now we know the new TSN is more advanced, let's find the actual
5430 SCTP_CALC_TSN_TO_GAP(gap, new_cum_tsn, asoc->mapping_array_base_tsn);
5431 asoc->cumulative_tsn = new_cum_tsn;
5432 if (gap >= m_size) {
5433 if ((long)gap > sctp_sbspace(&stcb->asoc, &stcb->sctp_socket->so_rcv)) {
5434 struct mbuf *op_err;
5435 char msg[SCTP_DIAG_INFO_LEN];
5438 * out of range (of single byte chunks in the rwnd I
5439 * give out). This must be an attacker.
5442 snprintf(msg, sizeof(msg),
5443 "New cum ack %8.8x too high, highest TSN %8.8x",
5444 new_cum_tsn, asoc->highest_tsn_inside_map);
5445 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
5446 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_33;
5447 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
5450 SCTP_STAT_INCR(sctps_fwdtsn_map_over);
5452 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
5453 asoc->mapping_array_base_tsn = new_cum_tsn + 1;
5454 asoc->highest_tsn_inside_map = new_cum_tsn;
5456 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
5457 asoc->highest_tsn_inside_nr_map = new_cum_tsn;
5459 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
5460 sctp_log_map(0, 3, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
5463 SCTP_TCB_LOCK_ASSERT(stcb);
5464 for (i = 0; i <= gap; i++) {
5465 if (!SCTP_IS_TSN_PRESENT(asoc->mapping_array, i) &&
5466 !SCTP_IS_TSN_PRESENT(asoc->nr_mapping_array, i)) {
5467 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, i);
5468 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn + i, asoc->highest_tsn_inside_nr_map)) {
5469 asoc->highest_tsn_inside_nr_map = asoc->mapping_array_base_tsn + i;
5474 /*************************************************************/
5475 /* 2. Clear up re-assembly queue */
5476 /*************************************************************/
5478 /* This is now done as part of clearing up the stream/seq */
5479 if (asoc->idata_supported == 0) {
5482 /* Flush all the un-ordered data based on cum-tsn */
5483 SCTP_INP_READ_LOCK(stcb->sctp_ep);
5484 for (sid = 0; sid < asoc->streamincnt; sid++) {
5485 sctp_flush_reassm_for_str_seq(stcb, asoc, sid, 0, 0, 1, new_cum_tsn);
5487 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
5489 /*******************************************************/
5490 /* 3. Update the PR-stream re-ordering queues and fix */
5491 /* delivery issues as needed. */
5492 /*******************************************************/
5493 fwd_sz -= sizeof(*fwd);
5496 unsigned int num_str;
5499 uint16_t ordered, flags;
5501 struct sctp_strseq *stseq, strseqbuf;
5502 struct sctp_strseq_mid *stseq_m, strseqbuf_m;
5504 offset += sizeof(*fwd);
5506 SCTP_INP_READ_LOCK(stcb->sctp_ep);
5507 if (asoc->idata_supported) {
5508 num_str = fwd_sz / sizeof(struct sctp_strseq_mid);
5511 num_str = fwd_sz / sizeof(struct sctp_strseq);
5514 for (i = 0; i < num_str; i++) {
5515 if (asoc->idata_supported) {
5516 stseq_m = (struct sctp_strseq_mid *)sctp_m_getptr(m, offset,
5517 sizeof(struct sctp_strseq_mid),
5518 (uint8_t *) & strseqbuf_m);
5519 offset += sizeof(struct sctp_strseq_mid);
5520 if (stseq_m == NULL) {
5523 stream = ntohs(stseq_m->stream);
5524 sequence = ntohl(stseq_m->msg_id);
5525 flags = ntohs(stseq_m->flags);
5526 if (flags & PR_SCTP_UNORDERED_FLAG) {
5532 stseq = (struct sctp_strseq *)sctp_m_getptr(m, offset,
5533 sizeof(struct sctp_strseq),
5534 (uint8_t *) & strseqbuf);
5535 offset += sizeof(struct sctp_strseq);
5536 if (stseq == NULL) {
5539 stream = ntohs(stseq->stream);
5540 sequence = (uint32_t) ntohs(stseq->sequence);
5548 * Ok we now look for the stream/seq on the read
5549 * queue where its not all delivered. If we find it
5550 * we transmute the read entry into a PDI_ABORTED.
5552 if (stream >= asoc->streamincnt) {
5553 /* screwed up streams, stop! */
5556 if ((asoc->str_of_pdapi == stream) &&
5557 (asoc->ssn_of_pdapi == sequence)) {
5559 * If this is the one we were partially
5560 * delivering now then we no longer are.
5561 * Note this will change with the reassembly
5564 asoc->fragmented_delivery_inprogress = 0;
5566 strm = &asoc->strmin[stream];
5567 if (asoc->idata_supported == 0) {
5570 for (strm_at = strm->last_sequence_delivered; SCTP_MSGID_GE(1, sequence, strm_at); strm_at++) {
5571 sctp_flush_reassm_for_str_seq(stcb, asoc, stream, strm_at, ordered, old, new_cum_tsn);
5576 for (strm_at = strm->last_sequence_delivered; SCTP_MSGID_GE(0, sequence, strm_at); strm_at++) {
5577 sctp_flush_reassm_for_str_seq(stcb, asoc, stream, strm_at, ordered, old, new_cum_tsn);
5580 TAILQ_FOREACH(ctl, &stcb->sctp_ep->read_queue, next) {
5581 if ((ctl->sinfo_stream == stream) &&
5582 (ctl->sinfo_ssn == sequence)) {
5583 str_seq = (stream << 16) | (0x0000ffff & sequence);
5584 ctl->pdapi_aborted = 1;
5585 sv = stcb->asoc.control_pdapi;
5587 if (ctl->on_strm_q == SCTP_ON_ORDERED) {
5588 TAILQ_REMOVE(&strm->inqueue, ctl, next_instrm);
5589 } else if (ctl->on_strm_q == SCTP_ON_UNORDERED) {
5590 TAILQ_REMOVE(&strm->uno_inqueue, ctl, next_instrm);
5592 } else if (ctl->on_strm_q) {
5593 panic("strm: %p ctl: %p unknown %d",
5594 strm, ctl, ctl->on_strm_q);
5598 stcb->asoc.control_pdapi = ctl;
5599 sctp_ulp_notify(SCTP_NOTIFY_PARTIAL_DELVIERY_INDICATION,
5601 SCTP_PARTIAL_DELIVERY_ABORTED,
5603 SCTP_SO_NOT_LOCKED);
5604 stcb->asoc.control_pdapi = sv;
5606 } else if ((ctl->sinfo_stream == stream) &&
5607 SCTP_MSGID_GT(old, ctl->sinfo_ssn, sequence)) {
5608 /* We are past our victim SSN */
5612 if (SCTP_MSGID_GT(old, sequence, strm->last_sequence_delivered)) {
5613 /* Update the sequence number */
5614 strm->last_sequence_delivered = sequence;
5616 /* now kick the stream the new way */
5617 /* sa_ignore NO_NULL_CHK */
5618 sctp_kick_prsctp_reorder_queue(stcb, strm);
5620 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
5623 * Now slide thing forward.
5625 sctp_slide_mapping_arrays(stcb);