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
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20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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30 * THE POSSIBILITY OF SUCH DAMAGE.
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
36 #include <netinet/sctp_os.h>
37 #include <netinet/sctp_var.h>
38 #include <netinet/sctp_sysctl.h>
39 #include <netinet/sctp_pcb.h>
40 #include <netinet/sctp_header.h>
41 #include <netinet/sctputil.h>
42 #include <netinet/sctp_output.h>
43 #include <netinet/sctp_input.h>
44 #include <netinet/sctp_indata.h>
45 #include <netinet/sctp_uio.h>
46 #include <netinet/sctp_timer.h>
50 * NOTES: On the outbound side of things I need to check the sack timer to
51 * see if I should generate a sack into the chunk queue (if I have data to
52 * send that is and will be sending it .. for bundling.
54 * The callback in sctp_usrreq.c will get called when the socket is read from.
55 * This will cause sctp_service_queues() to get called on the top entry in
60 sctp_set_rwnd(struct sctp_tcb *stcb, struct sctp_association *asoc)
62 asoc->my_rwnd = sctp_calc_rwnd(stcb, asoc);
65 /* Calculate what the rwnd would be */
67 sctp_calc_rwnd(struct sctp_tcb *stcb, struct sctp_association *asoc)
72 * This is really set wrong with respect to a 1-2-m socket. Since
73 * the sb_cc is the count that everyone as put up. When we re-write
74 * sctp_soreceive then we will fix this so that ONLY this
75 * associations data is taken into account.
77 if (stcb->sctp_socket == NULL)
80 if (stcb->asoc.sb_cc == 0 &&
81 asoc->size_on_reasm_queue == 0 &&
82 asoc->size_on_all_streams == 0) {
83 /* Full rwnd granted */
84 calc = max(SCTP_SB_LIMIT_RCV(stcb->sctp_socket), SCTP_MINIMAL_RWND);
87 /* get actual space */
88 calc = (uint32_t) sctp_sbspace(&stcb->asoc, &stcb->sctp_socket->so_rcv);
91 * take out what has NOT been put on socket queue and we yet hold
94 calc = sctp_sbspace_sub(calc, (uint32_t) (asoc->size_on_reasm_queue +
95 asoc->cnt_on_reasm_queue * MSIZE));
96 calc = sctp_sbspace_sub(calc, (uint32_t) (asoc->size_on_all_streams +
97 asoc->cnt_on_all_streams * MSIZE));
103 /* what is the overhead of all these rwnd's */
104 calc = sctp_sbspace_sub(calc, stcb->asoc.my_rwnd_control_len);
106 * If the window gets too small due to ctrl-stuff, reduce it to 1,
107 * even it is 0. SWS engaged
109 if (calc < stcb->asoc.my_rwnd_control_len) {
118 * Build out our readq entry based on the incoming packet.
120 struct sctp_queued_to_read *
121 sctp_build_readq_entry(struct sctp_tcb *stcb,
122 struct sctp_nets *net,
123 uint32_t tsn, uint32_t ppid,
124 uint32_t context, uint16_t stream_no,
125 uint16_t stream_seq, uint8_t flags,
128 struct sctp_queued_to_read *read_queue_e = NULL;
130 sctp_alloc_a_readq(stcb, read_queue_e);
131 if (read_queue_e == NULL) {
134 read_queue_e->sinfo_stream = stream_no;
135 read_queue_e->sinfo_ssn = stream_seq;
136 read_queue_e->sinfo_flags = (flags << 8);
137 read_queue_e->sinfo_ppid = ppid;
138 read_queue_e->sinfo_context = context;
139 read_queue_e->sinfo_timetolive = 0;
140 read_queue_e->sinfo_tsn = tsn;
141 read_queue_e->sinfo_cumtsn = tsn;
142 read_queue_e->sinfo_assoc_id = sctp_get_associd(stcb);
143 read_queue_e->whoFrom = net;
144 read_queue_e->length = 0;
145 atomic_add_int(&net->ref_count, 1);
146 read_queue_e->data = dm;
147 read_queue_e->spec_flags = 0;
148 read_queue_e->tail_mbuf = NULL;
149 read_queue_e->aux_data = NULL;
150 read_queue_e->stcb = stcb;
151 read_queue_e->port_from = stcb->rport;
152 read_queue_e->do_not_ref_stcb = 0;
153 read_queue_e->end_added = 0;
154 read_queue_e->some_taken = 0;
155 read_queue_e->pdapi_aborted = 0;
157 return (read_queue_e);
162 * Build out our readq entry based on the incoming packet.
164 static struct sctp_queued_to_read *
165 sctp_build_readq_entry_chk(struct sctp_tcb *stcb,
166 struct sctp_tmit_chunk *chk)
168 struct sctp_queued_to_read *read_queue_e = NULL;
170 sctp_alloc_a_readq(stcb, read_queue_e);
171 if (read_queue_e == NULL) {
174 read_queue_e->sinfo_stream = chk->rec.data.stream_number;
175 read_queue_e->sinfo_ssn = chk->rec.data.stream_seq;
176 read_queue_e->sinfo_flags = (chk->rec.data.rcv_flags << 8);
177 read_queue_e->sinfo_ppid = chk->rec.data.payloadtype;
178 read_queue_e->sinfo_context = stcb->asoc.context;
179 read_queue_e->sinfo_timetolive = 0;
180 read_queue_e->sinfo_tsn = chk->rec.data.TSN_seq;
181 read_queue_e->sinfo_cumtsn = chk->rec.data.TSN_seq;
182 read_queue_e->sinfo_assoc_id = sctp_get_associd(stcb);
183 read_queue_e->whoFrom = chk->whoTo;
184 read_queue_e->aux_data = NULL;
185 read_queue_e->length = 0;
186 atomic_add_int(&chk->whoTo->ref_count, 1);
187 read_queue_e->data = chk->data;
188 read_queue_e->tail_mbuf = NULL;
189 read_queue_e->stcb = stcb;
190 read_queue_e->port_from = stcb->rport;
191 read_queue_e->spec_flags = 0;
192 read_queue_e->do_not_ref_stcb = 0;
193 read_queue_e->end_added = 0;
194 read_queue_e->some_taken = 0;
195 read_queue_e->pdapi_aborted = 0;
197 return (read_queue_e);
202 sctp_build_ctl_nchunk(struct sctp_inpcb *inp, struct sctp_sndrcvinfo *sinfo)
204 struct sctp_extrcvinfo *seinfo;
205 struct sctp_sndrcvinfo *outinfo;
206 struct sctp_rcvinfo *rcvinfo;
207 struct sctp_nxtinfo *nxtinfo;
214 if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_RECVDATAIOEVNT) &&
215 sctp_is_feature_off(inp, SCTP_PCB_FLAGS_RECVRCVINFO) &&
216 sctp_is_feature_off(inp, SCTP_PCB_FLAGS_RECVNXTINFO)) {
217 /* user does not want any ancillary data */
221 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVRCVINFO)) {
222 len += CMSG_SPACE(sizeof(struct sctp_rcvinfo));
224 seinfo = (struct sctp_extrcvinfo *)sinfo;
225 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVNXTINFO) &&
226 (seinfo->sreinfo_next_flags & SCTP_NEXT_MSG_AVAIL)) {
228 len += CMSG_SPACE(sizeof(struct sctp_rcvinfo));
232 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVDATAIOEVNT)) {
233 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXT_RCVINFO)) {
235 len += CMSG_SPACE(sizeof(struct sctp_extrcvinfo));
238 len += CMSG_SPACE(sizeof(struct sctp_sndrcvinfo));
244 ret = sctp_get_mbuf_for_msg(len, 0, M_DONTWAIT, 1, MT_DATA);
249 SCTP_BUF_LEN(ret) = 0;
251 /* We need a CMSG header followed by the struct */
252 cmh = mtod(ret, struct cmsghdr *);
253 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVRCVINFO)) {
254 cmh->cmsg_level = IPPROTO_SCTP;
255 cmh->cmsg_len = CMSG_LEN(sizeof(struct sctp_rcvinfo));
256 cmh->cmsg_type = SCTP_RCVINFO;
257 rcvinfo = (struct sctp_rcvinfo *)CMSG_DATA(cmh);
258 rcvinfo->rcv_sid = sinfo->sinfo_stream;
259 rcvinfo->rcv_ssn = sinfo->sinfo_ssn;
260 rcvinfo->rcv_flags = sinfo->sinfo_flags;
261 rcvinfo->rcv_ppid = sinfo->sinfo_ppid;
262 rcvinfo->rcv_tsn = sinfo->sinfo_tsn;
263 rcvinfo->rcv_cumtsn = sinfo->sinfo_cumtsn;
264 rcvinfo->rcv_context = sinfo->sinfo_context;
265 rcvinfo->rcv_assoc_id = sinfo->sinfo_assoc_id;
266 cmh = (struct cmsghdr *)((caddr_t)cmh + CMSG_SPACE(sizeof(struct sctp_rcvinfo)));
267 SCTP_BUF_LEN(ret) += CMSG_SPACE(sizeof(struct sctp_rcvinfo));
270 cmh->cmsg_level = IPPROTO_SCTP;
271 cmh->cmsg_len = CMSG_LEN(sizeof(struct sctp_nxtinfo));
272 cmh->cmsg_type = SCTP_NXTINFO;
273 nxtinfo = (struct sctp_nxtinfo *)CMSG_DATA(cmh);
274 nxtinfo->nxt_sid = seinfo->sreinfo_next_stream;
275 nxtinfo->nxt_flags = 0;
276 if (seinfo->sreinfo_next_flags & SCTP_NEXT_MSG_IS_UNORDERED) {
277 nxtinfo->nxt_flags |= SCTP_UNORDERED;
279 if (seinfo->sreinfo_next_flags & SCTP_NEXT_MSG_IS_NOTIFICATION) {
280 nxtinfo->nxt_flags |= SCTP_NOTIFICATION;
282 if (seinfo->sreinfo_next_flags & SCTP_NEXT_MSG_ISCOMPLETE) {
283 nxtinfo->nxt_flags |= SCTP_COMPLETE;
285 nxtinfo->nxt_ppid = seinfo->sreinfo_next_ppid;
286 nxtinfo->nxt_length = seinfo->sreinfo_next_length;
287 nxtinfo->nxt_assoc_id = seinfo->sreinfo_next_aid;
288 cmh = (struct cmsghdr *)((caddr_t)cmh + CMSG_SPACE(sizeof(struct sctp_nxtinfo)));
289 SCTP_BUF_LEN(ret) += CMSG_SPACE(sizeof(struct sctp_nxtinfo));
291 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVDATAIOEVNT)) {
292 cmh->cmsg_level = IPPROTO_SCTP;
293 outinfo = (struct sctp_sndrcvinfo *)CMSG_DATA(cmh);
295 cmh->cmsg_len = CMSG_LEN(sizeof(struct sctp_extrcvinfo));
296 cmh->cmsg_type = SCTP_EXTRCV;
297 memcpy(outinfo, sinfo, sizeof(struct sctp_extrcvinfo));
298 SCTP_BUF_LEN(ret) += CMSG_SPACE(sizeof(struct sctp_extrcvinfo));
300 cmh->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo));
301 cmh->cmsg_type = SCTP_SNDRCV;
303 SCTP_BUF_LEN(ret) += CMSG_SPACE(sizeof(struct sctp_sndrcvinfo));
311 sctp_mark_non_revokable(struct sctp_association *asoc, uint32_t tsn)
313 uint32_t gap, i, cumackp1;
316 if (SCTP_BASE_SYSCTL(sctp_do_drain) == 0) {
319 cumackp1 = asoc->cumulative_tsn + 1;
320 if (SCTP_TSN_GT(cumackp1, tsn)) {
322 * this tsn is behind the cum ack and thus we don't need to
323 * worry about it being moved from one to the other.
327 SCTP_CALC_TSN_TO_GAP(gap, tsn, asoc->mapping_array_base_tsn);
328 if (!SCTP_IS_TSN_PRESENT(asoc->mapping_array, gap)) {
329 SCTP_PRINTF("gap:%x tsn:%x\n", gap, tsn);
330 sctp_print_mapping_array(asoc);
332 panic("Things are really messed up now!!");
335 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap);
336 SCTP_UNSET_TSN_PRESENT(asoc->mapping_array, gap);
337 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) {
338 asoc->highest_tsn_inside_nr_map = tsn;
340 if (tsn == asoc->highest_tsn_inside_map) {
341 /* We must back down to see what the new highest is */
342 for (i = tsn - 1; SCTP_TSN_GE(i, asoc->mapping_array_base_tsn); i--) {
343 SCTP_CALC_TSN_TO_GAP(gap, i, asoc->mapping_array_base_tsn);
344 if (SCTP_IS_TSN_PRESENT(asoc->mapping_array, gap)) {
345 asoc->highest_tsn_inside_map = i;
351 asoc->highest_tsn_inside_map = asoc->mapping_array_base_tsn - 1;
358 * We are delivering currently from the reassembly queue. We must continue to
359 * deliver until we either: 1) run out of space. 2) run out of sequential
360 * TSN's 3) hit the SCTP_DATA_LAST_FRAG flag.
363 sctp_service_reassembly(struct sctp_tcb *stcb, struct sctp_association *asoc)
365 struct sctp_tmit_chunk *chk, *nchk;
370 struct sctp_queued_to_read *control, *ctl, *nctl;
375 cntDel = stream_no = 0;
376 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
377 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
378 (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET)) {
379 /* socket above is long gone or going.. */
381 asoc->fragmented_delivery_inprogress = 0;
382 TAILQ_FOREACH_SAFE(chk, &asoc->reasmqueue, sctp_next, nchk) {
383 TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next);
384 asoc->size_on_reasm_queue -= chk->send_size;
385 sctp_ucount_decr(asoc->cnt_on_reasm_queue);
387 * Lose the data pointer, since its in the socket
391 sctp_m_freem(chk->data);
394 /* Now free the address and data */
395 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
396 /* sa_ignore FREED_MEMORY */
400 SCTP_TCB_LOCK_ASSERT(stcb);
401 TAILQ_FOREACH_SAFE(chk, &asoc->reasmqueue, sctp_next, nchk) {
402 if (chk->rec.data.TSN_seq != (asoc->tsn_last_delivered + 1)) {
403 /* Can't deliver more :< */
406 stream_no = chk->rec.data.stream_number;
407 nxt_todel = asoc->strmin[stream_no].last_sequence_delivered + 1;
408 if (nxt_todel != chk->rec.data.stream_seq &&
409 (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
411 * Not the next sequence to deliver in its stream OR
416 if (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) {
418 control = sctp_build_readq_entry_chk(stcb, chk);
419 if (control == NULL) {
423 /* save it off for our future deliveries */
424 stcb->asoc.control_pdapi = control;
425 if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG)
429 sctp_mark_non_revokable(asoc, chk->rec.data.TSN_seq);
430 sctp_add_to_readq(stcb->sctp_ep,
431 stcb, control, &stcb->sctp_socket->so_rcv, end,
432 SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED);
435 if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG)
439 sctp_mark_non_revokable(asoc, chk->rec.data.TSN_seq);
440 if (sctp_append_to_readq(stcb->sctp_ep, stcb,
441 stcb->asoc.control_pdapi,
442 chk->data, end, chk->rec.data.TSN_seq,
443 &stcb->sctp_socket->so_rcv)) {
445 * something is very wrong, either
446 * control_pdapi is NULL, or the tail_mbuf
447 * is corrupt, or there is a EOM already on
450 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
454 if ((stcb->asoc.control_pdapi == NULL) || (stcb->asoc.control_pdapi->tail_mbuf == NULL)) {
455 panic("This should not happen control_pdapi NULL?");
457 /* if we did not panic, it was a EOM */
458 panic("Bad chunking ??");
460 if ((stcb->asoc.control_pdapi == NULL) || (stcb->asoc.control_pdapi->tail_mbuf == NULL)) {
461 SCTP_PRINTF("This should not happen control_pdapi NULL?\n");
463 SCTP_PRINTF("Bad chunking ??\n");
464 SCTP_PRINTF("Dumping re-assembly queue this will probably hose the association\n");
472 /* pull it we did it */
473 TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next);
474 if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) {
475 asoc->fragmented_delivery_inprogress = 0;
476 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
477 asoc->strmin[stream_no].last_sequence_delivered++;
479 if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0) {
480 SCTP_STAT_INCR_COUNTER64(sctps_reasmusrmsgs);
482 } else if (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) {
484 * turn the flag back on since we just delivered
487 asoc->fragmented_delivery_inprogress = 1;
489 asoc->tsn_of_pdapi_last_delivered = chk->rec.data.TSN_seq;
490 asoc->last_flags_delivered = chk->rec.data.rcv_flags;
491 asoc->last_strm_seq_delivered = chk->rec.data.stream_seq;
492 asoc->last_strm_no_delivered = chk->rec.data.stream_number;
494 asoc->tsn_last_delivered = chk->rec.data.TSN_seq;
495 asoc->size_on_reasm_queue -= chk->send_size;
496 sctp_ucount_decr(asoc->cnt_on_reasm_queue);
497 /* free up the chk */
499 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
501 if (asoc->fragmented_delivery_inprogress == 0) {
503 * Now lets see if we can deliver the next one on
506 struct sctp_stream_in *strm;
508 strm = &asoc->strmin[stream_no];
509 nxt_todel = strm->last_sequence_delivered + 1;
510 TAILQ_FOREACH_SAFE(ctl, &strm->inqueue, next, nctl) {
511 /* Deliver more if we can. */
512 if (nxt_todel == ctl->sinfo_ssn) {
513 TAILQ_REMOVE(&strm->inqueue, ctl, next);
514 asoc->size_on_all_streams -= ctl->length;
515 sctp_ucount_decr(asoc->cnt_on_all_streams);
516 strm->last_sequence_delivered++;
517 sctp_mark_non_revokable(asoc, ctl->sinfo_tsn);
518 sctp_add_to_readq(stcb->sctp_ep, stcb,
520 &stcb->sctp_socket->so_rcv, 1,
521 SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED);
525 nxt_todel = strm->last_sequence_delivered + 1;
533 * Queue the chunk either right into the socket buffer if it is the next one
534 * to go OR put it in the correct place in the delivery queue. If we do
535 * append to the so_buf, keep doing so until we are out of order. One big
536 * question still remains, what to do when the socket buffer is FULL??
539 sctp_queue_data_to_stream(struct sctp_tcb *stcb, struct sctp_association *asoc,
540 struct sctp_queued_to_read *control, int *abort_flag)
543 * FIX-ME maybe? What happens when the ssn wraps? If we are getting
544 * all the data in one stream this could happen quite rapidly. One
545 * could use the TSN to keep track of things, but this scheme breaks
546 * down in the other type of stream useage that could occur. Send a
547 * single msg to stream 0, send 4Billion messages to stream 1, now
548 * send a message to stream 0. You have a situation where the TSN
549 * has wrapped but not in the stream. Is this worth worrying about
550 * or should we just change our queue sort at the bottom to be by
553 * Could it also be legal for a peer to send ssn 1 with TSN 2 and ssn 2
554 * with TSN 1? If the peer is doing some sort of funky TSN/SSN
555 * assignment this could happen... and I don't see how this would be
556 * a violation. So for now I am undecided an will leave the sort by
557 * SSN alone. Maybe a hybred approach is the answer
560 struct sctp_stream_in *strm;
561 struct sctp_queued_to_read *at;
567 asoc->size_on_all_streams += control->length;
568 sctp_ucount_incr(asoc->cnt_on_all_streams);
569 strm = &asoc->strmin[control->sinfo_stream];
570 nxt_todel = strm->last_sequence_delivered + 1;
571 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
572 sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_INTO_STRD);
574 SCTPDBG(SCTP_DEBUG_INDATA1,
575 "queue to stream called for ssn:%u lastdel:%u nxt:%u\n",
576 (uint32_t) control->sinfo_stream,
577 (uint32_t) strm->last_sequence_delivered,
578 (uint32_t) nxt_todel);
579 if (SCTP_SSN_GE(strm->last_sequence_delivered, control->sinfo_ssn)) {
580 /* The incoming sseq is behind where we last delivered? */
581 SCTPDBG(SCTP_DEBUG_INDATA1, "Duplicate S-SEQ:%d delivered:%d from peer, Abort association\n",
582 control->sinfo_ssn, strm->last_sequence_delivered);
585 * throw it in the stream so it gets cleaned up in
586 * association destruction
588 TAILQ_INSERT_HEAD(&strm->inqueue, control, next);
589 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
590 0, M_DONTWAIT, 1, MT_DATA);
592 struct sctp_paramhdr *ph;
595 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
596 (sizeof(uint32_t) * 3);
597 ph = mtod(oper, struct sctp_paramhdr *);
598 ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
599 ph->param_length = htons(SCTP_BUF_LEN(oper));
600 ippp = (uint32_t *) (ph + 1);
601 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_1);
603 *ippp = control->sinfo_tsn;
605 *ippp = ((control->sinfo_stream << 16) | control->sinfo_ssn);
607 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_1;
608 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED);
613 if (nxt_todel == control->sinfo_ssn) {
614 /* can be delivered right away? */
615 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
616 sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_IMMED_DEL);
618 /* EY it wont be queued if it could be delivered directly */
620 asoc->size_on_all_streams -= control->length;
621 sctp_ucount_decr(asoc->cnt_on_all_streams);
622 strm->last_sequence_delivered++;
624 sctp_mark_non_revokable(asoc, control->sinfo_tsn);
625 sctp_add_to_readq(stcb->sctp_ep, stcb,
627 &stcb->sctp_socket->so_rcv, 1,
628 SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED);
629 TAILQ_FOREACH_SAFE(control, &strm->inqueue, next, at) {
631 nxt_todel = strm->last_sequence_delivered + 1;
632 if (nxt_todel == control->sinfo_ssn) {
633 TAILQ_REMOVE(&strm->inqueue, control, next);
634 asoc->size_on_all_streams -= control->length;
635 sctp_ucount_decr(asoc->cnt_on_all_streams);
636 strm->last_sequence_delivered++;
638 * We ignore the return of deliver_data here
639 * since we always can hold the chunk on the
640 * d-queue. And we have a finite number that
641 * can be delivered from the strq.
643 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
644 sctp_log_strm_del(control, NULL,
645 SCTP_STR_LOG_FROM_IMMED_DEL);
647 sctp_mark_non_revokable(asoc, control->sinfo_tsn);
648 sctp_add_to_readq(stcb->sctp_ep, stcb,
650 &stcb->sctp_socket->so_rcv, 1,
651 SCTP_READ_LOCK_NOT_HELD,
660 * Ok, we did not deliver this guy, find the correct place
661 * to put it on the queue.
663 if (SCTP_TSN_GE(asoc->cumulative_tsn, control->sinfo_tsn)) {
666 if (TAILQ_EMPTY(&strm->inqueue)) {
668 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
669 sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_INSERT_HD);
671 TAILQ_INSERT_HEAD(&strm->inqueue, control, next);
673 TAILQ_FOREACH(at, &strm->inqueue, next) {
674 if (SCTP_SSN_GT(at->sinfo_ssn, control->sinfo_ssn)) {
676 * one in queue is bigger than the
677 * new one, insert before this one
679 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
680 sctp_log_strm_del(control, at,
681 SCTP_STR_LOG_FROM_INSERT_MD);
683 TAILQ_INSERT_BEFORE(at, control, next);
685 } else if (at->sinfo_ssn == control->sinfo_ssn) {
687 * Gak, He sent me a duplicate str
691 * foo bar, I guess I will just free
692 * this new guy, should we abort
693 * too? FIX ME MAYBE? Or it COULD be
694 * that the SSN's have wrapped.
695 * Maybe I should compare to TSN
696 * somehow... sigh for now just blow
701 sctp_m_freem(control->data);
702 control->data = NULL;
703 asoc->size_on_all_streams -= control->length;
704 sctp_ucount_decr(asoc->cnt_on_all_streams);
705 if (control->whoFrom) {
706 sctp_free_remote_addr(control->whoFrom);
707 control->whoFrom = NULL;
709 sctp_free_a_readq(stcb, control);
712 if (TAILQ_NEXT(at, next) == NULL) {
714 * We are at the end, insert
717 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
718 sctp_log_strm_del(control, at,
719 SCTP_STR_LOG_FROM_INSERT_TL);
721 TAILQ_INSERT_AFTER(&strm->inqueue,
732 * Returns two things: You get the total size of the deliverable parts of the
733 * first fragmented message on the reassembly queue. And you get a 1 back if
734 * all of the message is ready or a 0 back if the message is still incomplete
737 sctp_is_all_msg_on_reasm(struct sctp_association *asoc, uint32_t * t_size)
739 struct sctp_tmit_chunk *chk;
743 chk = TAILQ_FIRST(&asoc->reasmqueue);
745 /* nothing on the queue */
748 if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0) {
749 /* Not a first on the queue */
752 tsn = chk->rec.data.TSN_seq;
753 TAILQ_FOREACH(chk, &asoc->reasmqueue, sctp_next) {
754 if (tsn != chk->rec.data.TSN_seq) {
757 *t_size += chk->send_size;
758 if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) {
767 sctp_deliver_reasm_check(struct sctp_tcb *stcb, struct sctp_association *asoc)
769 struct sctp_tmit_chunk *chk;
771 uint32_t tsize, pd_point;
774 chk = TAILQ_FIRST(&asoc->reasmqueue);
777 asoc->size_on_reasm_queue = 0;
778 asoc->cnt_on_reasm_queue = 0;
781 if (asoc->fragmented_delivery_inprogress == 0) {
783 asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered + 1;
784 if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) &&
785 (nxt_todel == chk->rec.data.stream_seq ||
786 (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED))) {
788 * Yep the first one is here and its ok to deliver
791 if (stcb->sctp_socket) {
792 pd_point = min(SCTP_SB_LIMIT_RCV(stcb->sctp_socket),
793 stcb->sctp_ep->partial_delivery_point);
795 pd_point = stcb->sctp_ep->partial_delivery_point;
797 if (sctp_is_all_msg_on_reasm(asoc, &tsize) || (tsize >= pd_point)) {
800 * Yes, we setup to start reception, by
801 * backing down the TSN just in case we
802 * can't deliver. If we
804 asoc->fragmented_delivery_inprogress = 1;
805 asoc->tsn_last_delivered =
806 chk->rec.data.TSN_seq - 1;
808 chk->rec.data.stream_number;
809 asoc->ssn_of_pdapi = chk->rec.data.stream_seq;
810 asoc->pdapi_ppid = chk->rec.data.payloadtype;
811 asoc->fragment_flags = chk->rec.data.rcv_flags;
812 sctp_service_reassembly(stcb, asoc);
817 * Service re-assembly will deliver stream data queued at
818 * the end of fragmented delivery.. but it wont know to go
819 * back and call itself again... we do that here with the
822 sctp_service_reassembly(stcb, asoc);
823 if (asoc->fragmented_delivery_inprogress == 0) {
825 * finished our Fragmented delivery, could be more
834 * Dump onto the re-assembly queue, in its proper place. After dumping on the
835 * queue, see if anthing can be delivered. If so pull it off (or as much as
836 * we can. If we run out of space then we must dump what we can and set the
837 * appropriate flag to say we queued what we could.
840 sctp_queue_data_for_reasm(struct sctp_tcb *stcb, struct sctp_association *asoc,
841 struct sctp_tmit_chunk *chk, int *abort_flag)
844 uint32_t cum_ackp1, prev_tsn, post_tsn;
845 struct sctp_tmit_chunk *at, *prev, *next;
848 cum_ackp1 = asoc->tsn_last_delivered + 1;
849 if (TAILQ_EMPTY(&asoc->reasmqueue)) {
850 /* This is the first one on the queue */
851 TAILQ_INSERT_HEAD(&asoc->reasmqueue, chk, sctp_next);
853 * we do not check for delivery of anything when only one
856 asoc->size_on_reasm_queue = chk->send_size;
857 sctp_ucount_incr(asoc->cnt_on_reasm_queue);
858 if (chk->rec.data.TSN_seq == cum_ackp1) {
859 if (asoc->fragmented_delivery_inprogress == 0 &&
860 (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) !=
861 SCTP_DATA_FIRST_FRAG) {
863 * An empty queue, no delivery inprogress,
864 * we hit the next one and it does NOT have
865 * a FIRST fragment mark.
867 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, its not first, no fragmented delivery in progress\n");
868 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
869 0, M_DONTWAIT, 1, MT_DATA);
872 struct sctp_paramhdr *ph;
876 sizeof(struct sctp_paramhdr) +
877 (sizeof(uint32_t) * 3);
878 ph = mtod(oper, struct sctp_paramhdr *);
880 htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
881 ph->param_length = htons(SCTP_BUF_LEN(oper));
882 ippp = (uint32_t *) (ph + 1);
883 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_2);
885 *ippp = chk->rec.data.TSN_seq;
887 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
890 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_2;
891 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED);
893 } else if (asoc->fragmented_delivery_inprogress &&
894 (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == SCTP_DATA_FIRST_FRAG) {
896 * We are doing a partial delivery and the
897 * NEXT chunk MUST be either the LAST or
898 * MIDDLE fragment NOT a FIRST
900 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it IS a first and fragmented delivery in progress\n");
901 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
902 0, M_DONTWAIT, 1, MT_DATA);
904 struct sctp_paramhdr *ph;
908 sizeof(struct sctp_paramhdr) +
909 (3 * sizeof(uint32_t));
910 ph = mtod(oper, struct sctp_paramhdr *);
912 htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
913 ph->param_length = htons(SCTP_BUF_LEN(oper));
914 ippp = (uint32_t *) (ph + 1);
915 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_3);
917 *ippp = chk->rec.data.TSN_seq;
919 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
921 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_3;
922 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED);
924 } else if (asoc->fragmented_delivery_inprogress) {
926 * Here we are ok with a MIDDLE or LAST
929 if (chk->rec.data.stream_number !=
930 asoc->str_of_pdapi) {
931 /* Got to be the right STR No */
932 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it IS not same stream number %d vs %d\n",
933 chk->rec.data.stream_number,
935 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
936 0, M_DONTWAIT, 1, MT_DATA);
938 struct sctp_paramhdr *ph;
942 sizeof(struct sctp_paramhdr) +
943 (sizeof(uint32_t) * 3);
945 struct sctp_paramhdr *);
947 htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
949 htons(SCTP_BUF_LEN(oper));
950 ippp = (uint32_t *) (ph + 1);
951 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_4);
953 *ippp = chk->rec.data.TSN_seq;
955 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
957 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_4;
958 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED);
960 } else if ((asoc->fragment_flags & SCTP_DATA_UNORDERED) !=
961 SCTP_DATA_UNORDERED &&
962 chk->rec.data.stream_seq != asoc->ssn_of_pdapi) {
963 /* Got to be the right STR Seq */
964 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it IS not same stream seq %d vs %d\n",
965 chk->rec.data.stream_seq,
967 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
968 0, M_DONTWAIT, 1, MT_DATA);
970 struct sctp_paramhdr *ph;
974 sizeof(struct sctp_paramhdr) +
975 (3 * sizeof(uint32_t));
977 struct sctp_paramhdr *);
979 htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
981 htons(SCTP_BUF_LEN(oper));
982 ippp = (uint32_t *) (ph + 1);
983 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_5);
985 *ippp = chk->rec.data.TSN_seq;
987 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
990 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_5;
991 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED);
999 TAILQ_FOREACH(at, &asoc->reasmqueue, sctp_next) {
1000 if (SCTP_TSN_GT(at->rec.data.TSN_seq, chk->rec.data.TSN_seq)) {
1002 * one in queue is bigger than the new one, insert
1006 asoc->size_on_reasm_queue += chk->send_size;
1007 sctp_ucount_incr(asoc->cnt_on_reasm_queue);
1009 TAILQ_INSERT_BEFORE(at, chk, sctp_next);
1011 } else if (at->rec.data.TSN_seq == chk->rec.data.TSN_seq) {
1012 /* Gak, He sent me a duplicate str seq number */
1014 * foo bar, I guess I will just free this new guy,
1015 * should we abort too? FIX ME MAYBE? Or it COULD be
1016 * that the SSN's have wrapped. Maybe I should
1017 * compare to TSN somehow... sigh for now just blow
1021 sctp_m_freem(chk->data);
1024 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
1028 if (TAILQ_NEXT(at, sctp_next) == NULL) {
1030 * We are at the end, insert it after this
1033 /* check it first */
1034 asoc->size_on_reasm_queue += chk->send_size;
1035 sctp_ucount_incr(asoc->cnt_on_reasm_queue);
1036 TAILQ_INSERT_AFTER(&asoc->reasmqueue, at, chk, sctp_next);
1041 /* Now the audits */
1043 prev_tsn = chk->rec.data.TSN_seq - 1;
1044 if (prev_tsn == prev->rec.data.TSN_seq) {
1046 * Ok the one I am dropping onto the end is the
1047 * NEXT. A bit of valdiation here.
1049 if ((prev->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
1050 SCTP_DATA_FIRST_FRAG ||
1051 (prev->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
1052 SCTP_DATA_MIDDLE_FRAG) {
1054 * Insert chk MUST be a MIDDLE or LAST
1057 if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
1058 SCTP_DATA_FIRST_FRAG) {
1059 SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - It can be a midlle or last but not a first\n");
1060 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it's a FIRST!\n");
1061 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
1062 0, M_DONTWAIT, 1, MT_DATA);
1064 struct sctp_paramhdr *ph;
1067 SCTP_BUF_LEN(oper) =
1068 sizeof(struct sctp_paramhdr) +
1069 (3 * sizeof(uint32_t));
1071 struct sctp_paramhdr *);
1073 htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
1075 htons(SCTP_BUF_LEN(oper));
1076 ippp = (uint32_t *) (ph + 1);
1077 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_6);
1079 *ippp = chk->rec.data.TSN_seq;
1081 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
1084 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_6;
1085 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED);
1089 if (chk->rec.data.stream_number !=
1090 prev->rec.data.stream_number) {
1092 * Huh, need the correct STR here,
1093 * they must be the same.
1095 SCTP_PRINTF("Prev check - Gak, Evil plot, ssn:%d not the same as at:%d\n",
1096 chk->rec.data.stream_number,
1097 prev->rec.data.stream_number);
1098 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
1099 0, M_DONTWAIT, 1, MT_DATA);
1101 struct sctp_paramhdr *ph;
1104 SCTP_BUF_LEN(oper) =
1105 sizeof(struct sctp_paramhdr) +
1106 (3 * sizeof(uint32_t));
1108 struct sctp_paramhdr *);
1110 htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
1112 htons(SCTP_BUF_LEN(oper));
1113 ippp = (uint32_t *) (ph + 1);
1114 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_7);
1116 *ippp = chk->rec.data.TSN_seq;
1118 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
1120 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_7;
1121 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED);
1125 if ((prev->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0 &&
1126 chk->rec.data.stream_seq !=
1127 prev->rec.data.stream_seq) {
1129 * Huh, need the correct STR here,
1130 * they must be the same.
1132 SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - Gak, Evil plot, sseq:%d not the same as at:%d\n",
1133 chk->rec.data.stream_seq,
1134 prev->rec.data.stream_seq);
1135 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
1136 0, M_DONTWAIT, 1, MT_DATA);
1138 struct sctp_paramhdr *ph;
1141 SCTP_BUF_LEN(oper) =
1142 sizeof(struct sctp_paramhdr) +
1143 (3 * sizeof(uint32_t));
1145 struct sctp_paramhdr *);
1147 htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
1149 htons(SCTP_BUF_LEN(oper));
1150 ippp = (uint32_t *) (ph + 1);
1151 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_8);
1153 *ippp = chk->rec.data.TSN_seq;
1155 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
1157 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_8;
1158 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED);
1162 } else if ((prev->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
1163 SCTP_DATA_LAST_FRAG) {
1164 /* Insert chk MUST be a FIRST */
1165 if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) !=
1166 SCTP_DATA_FIRST_FRAG) {
1167 SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - Gak, evil plot, its not FIRST and it must be!\n");
1168 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
1169 0, M_DONTWAIT, 1, MT_DATA);
1171 struct sctp_paramhdr *ph;
1174 SCTP_BUF_LEN(oper) =
1175 sizeof(struct sctp_paramhdr) +
1176 (3 * sizeof(uint32_t));
1178 struct sctp_paramhdr *);
1180 htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
1182 htons(SCTP_BUF_LEN(oper));
1183 ippp = (uint32_t *) (ph + 1);
1184 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_9);
1186 *ippp = chk->rec.data.TSN_seq;
1188 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
1191 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_9;
1192 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED);
1200 post_tsn = chk->rec.data.TSN_seq + 1;
1201 if (post_tsn == next->rec.data.TSN_seq) {
1203 * Ok the one I am inserting ahead of is my NEXT
1204 * one. A bit of valdiation here.
1206 if (next->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) {
1207 /* Insert chk MUST be a last fragment */
1208 if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK)
1209 != SCTP_DATA_LAST_FRAG) {
1210 SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Next is FIRST, we must be LAST\n");
1211 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, its not a last!\n");
1212 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
1213 0, M_DONTWAIT, 1, MT_DATA);
1215 struct sctp_paramhdr *ph;
1218 SCTP_BUF_LEN(oper) =
1219 sizeof(struct sctp_paramhdr) +
1220 (3 * sizeof(uint32_t));
1222 struct sctp_paramhdr *);
1224 htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
1226 htons(SCTP_BUF_LEN(oper));
1227 ippp = (uint32_t *) (ph + 1);
1228 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_10);
1230 *ippp = chk->rec.data.TSN_seq;
1232 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
1234 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_10;
1235 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED);
1239 } else if ((next->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
1240 SCTP_DATA_MIDDLE_FRAG ||
1241 (next->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
1242 SCTP_DATA_LAST_FRAG) {
1244 * Insert chk CAN be MIDDLE or FIRST NOT
1247 if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
1248 SCTP_DATA_LAST_FRAG) {
1249 SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Next is a MIDDLE/LAST\n");
1250 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, new prev chunk is a LAST\n");
1251 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
1252 0, M_DONTWAIT, 1, MT_DATA);
1254 struct sctp_paramhdr *ph;
1257 SCTP_BUF_LEN(oper) =
1258 sizeof(struct sctp_paramhdr) +
1259 (3 * sizeof(uint32_t));
1261 struct sctp_paramhdr *);
1263 htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
1265 htons(SCTP_BUF_LEN(oper));
1266 ippp = (uint32_t *) (ph + 1);
1267 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_11);
1269 *ippp = chk->rec.data.TSN_seq;
1271 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
1274 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_11;
1275 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED);
1279 if (chk->rec.data.stream_number !=
1280 next->rec.data.stream_number) {
1282 * Huh, need the correct STR here,
1283 * they must be the same.
1285 SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Gak, Evil plot, ssn:%d not the same as at:%d\n",
1286 chk->rec.data.stream_number,
1287 next->rec.data.stream_number);
1288 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
1289 0, M_DONTWAIT, 1, MT_DATA);
1291 struct sctp_paramhdr *ph;
1294 SCTP_BUF_LEN(oper) =
1295 sizeof(struct sctp_paramhdr) +
1296 (3 * sizeof(uint32_t));
1298 struct sctp_paramhdr *);
1300 htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
1302 htons(SCTP_BUF_LEN(oper));
1303 ippp = (uint32_t *) (ph + 1);
1304 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_12);
1306 *ippp = chk->rec.data.TSN_seq;
1308 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
1311 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_12;
1312 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED);
1316 if ((next->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0 &&
1317 chk->rec.data.stream_seq !=
1318 next->rec.data.stream_seq) {
1320 * Huh, need the correct STR here,
1321 * they must be the same.
1323 SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Gak, Evil plot, sseq:%d not the same as at:%d\n",
1324 chk->rec.data.stream_seq,
1325 next->rec.data.stream_seq);
1326 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
1327 0, M_DONTWAIT, 1, MT_DATA);
1329 struct sctp_paramhdr *ph;
1332 SCTP_BUF_LEN(oper) =
1333 sizeof(struct sctp_paramhdr) +
1334 (3 * sizeof(uint32_t));
1336 struct sctp_paramhdr *);
1338 htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
1340 htons(SCTP_BUF_LEN(oper));
1341 ippp = (uint32_t *) (ph + 1);
1342 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_13);
1344 *ippp = chk->rec.data.TSN_seq;
1346 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
1348 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_13;
1349 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED);
1356 /* Do we need to do some delivery? check */
1357 sctp_deliver_reasm_check(stcb, asoc);
1361 * This is an unfortunate routine. It checks to make sure a evil guy is not
1362 * stuffing us full of bad packet fragments. A broken peer could also do this
1363 * but this is doubtful. It is to bad I must worry about evil crackers sigh
1367 sctp_does_tsn_belong_to_reasm(struct sctp_association *asoc,
1370 struct sctp_tmit_chunk *at;
1373 TAILQ_FOREACH(at, &asoc->reasmqueue, sctp_next) {
1374 if (SCTP_TSN_GT(TSN_seq, at->rec.data.TSN_seq)) {
1375 /* is it one bigger? */
1376 tsn_est = at->rec.data.TSN_seq + 1;
1377 if (tsn_est == TSN_seq) {
1378 /* yep. It better be a last then */
1379 if ((at->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) !=
1380 SCTP_DATA_LAST_FRAG) {
1382 * Ok this guy belongs next to a guy
1383 * that is NOT last, it should be a
1384 * middle/last, not a complete
1390 * This guy is ok since its a LAST
1391 * and the new chunk is a fully
1392 * self- contained one.
1397 } else if (TSN_seq == at->rec.data.TSN_seq) {
1398 /* Software error since I have a dup? */
1402 * Ok, 'at' is larger than new chunk but does it
1403 * need to be right before it.
1405 tsn_est = TSN_seq + 1;
1406 if (tsn_est == at->rec.data.TSN_seq) {
1407 /* Yep, It better be a first */
1408 if ((at->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) !=
1409 SCTP_DATA_FIRST_FRAG) {
1421 sctp_process_a_data_chunk(struct sctp_tcb *stcb, struct sctp_association *asoc,
1422 struct mbuf **m, int offset, struct sctp_data_chunk *ch, int chk_length,
1423 struct sctp_nets *net, uint32_t * high_tsn, int *abort_flag,
1424 int *break_flag, int last_chunk)
1426 /* Process a data chunk */
1427 /* struct sctp_tmit_chunk *chk; */
1428 struct sctp_tmit_chunk *chk;
1432 int need_reasm_check = 0;
1433 uint16_t strmno, strmseq;
1435 struct sctp_queued_to_read *control;
1437 uint32_t protocol_id;
1438 uint8_t chunk_flags;
1439 struct sctp_stream_reset_list *liste;
1442 tsn = ntohl(ch->dp.tsn);
1443 chunk_flags = ch->ch.chunk_flags;
1444 if ((chunk_flags & SCTP_DATA_SACK_IMMEDIATELY) == SCTP_DATA_SACK_IMMEDIATELY) {
1445 asoc->send_sack = 1;
1447 protocol_id = ch->dp.protocol_id;
1448 ordered = ((chunk_flags & SCTP_DATA_UNORDERED) == 0);
1449 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
1450 sctp_log_map(tsn, asoc->cumulative_tsn, asoc->highest_tsn_inside_map, SCTP_MAP_TSN_ENTERS);
1455 SCTP_LTRACE_CHK(stcb->sctp_ep, stcb, ch->ch.chunk_type, tsn);
1456 if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
1457 /* It is a duplicate */
1458 SCTP_STAT_INCR(sctps_recvdupdata);
1459 if (asoc->numduptsns < SCTP_MAX_DUP_TSNS) {
1460 /* Record a dup for the next outbound sack */
1461 asoc->dup_tsns[asoc->numduptsns] = tsn;
1464 asoc->send_sack = 1;
1467 /* Calculate the number of TSN's between the base and this TSN */
1468 SCTP_CALC_TSN_TO_GAP(gap, tsn, asoc->mapping_array_base_tsn);
1469 if (gap >= (SCTP_MAPPING_ARRAY << 3)) {
1470 /* Can't hold the bit in the mapping at max array, toss it */
1473 if (gap >= (uint32_t) (asoc->mapping_array_size << 3)) {
1474 SCTP_TCB_LOCK_ASSERT(stcb);
1475 if (sctp_expand_mapping_array(asoc, gap)) {
1476 /* Can't expand, drop it */
1480 if (SCTP_TSN_GT(tsn, *high_tsn)) {
1483 /* See if we have received this one already */
1484 if (SCTP_IS_TSN_PRESENT(asoc->mapping_array, gap) ||
1485 SCTP_IS_TSN_PRESENT(asoc->nr_mapping_array, gap)) {
1486 SCTP_STAT_INCR(sctps_recvdupdata);
1487 if (asoc->numduptsns < SCTP_MAX_DUP_TSNS) {
1488 /* Record a dup for the next outbound sack */
1489 asoc->dup_tsns[asoc->numduptsns] = tsn;
1492 asoc->send_sack = 1;
1496 * Check to see about the GONE flag, duplicates would cause a sack
1497 * to be sent up above
1499 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
1500 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
1501 (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET))
1504 * wait a minute, this guy is gone, there is no longer a
1505 * receiver. Send peer an ABORT!
1507 struct mbuf *op_err;
1509 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
1510 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
1515 * Now before going further we see if there is room. If NOT then we
1516 * MAY let one through only IF this TSN is the one we are waiting
1517 * for on a partial delivery API.
1520 /* now do the tests */
1521 if (((asoc->cnt_on_all_streams +
1522 asoc->cnt_on_reasm_queue +
1523 asoc->cnt_msg_on_sb) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue)) ||
1524 (((int)asoc->my_rwnd) <= 0)) {
1526 * When we have NO room in the rwnd we check to make sure
1527 * the reader is doing its job...
1529 if (stcb->sctp_socket->so_rcv.sb_cc) {
1530 /* some to read, wake-up */
1531 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1534 so = SCTP_INP_SO(stcb->sctp_ep);
1535 atomic_add_int(&stcb->asoc.refcnt, 1);
1536 SCTP_TCB_UNLOCK(stcb);
1537 SCTP_SOCKET_LOCK(so, 1);
1538 SCTP_TCB_LOCK(stcb);
1539 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1540 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1541 /* assoc was freed while we were unlocked */
1542 SCTP_SOCKET_UNLOCK(so, 1);
1546 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
1547 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1548 SCTP_SOCKET_UNLOCK(so, 1);
1551 /* now is it in the mapping array of what we have accepted? */
1552 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_map) &&
1553 SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) {
1554 /* Nope not in the valid range dump it */
1555 sctp_set_rwnd(stcb, asoc);
1556 if ((asoc->cnt_on_all_streams +
1557 asoc->cnt_on_reasm_queue +
1558 asoc->cnt_msg_on_sb) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue)) {
1559 SCTP_STAT_INCR(sctps_datadropchklmt);
1561 SCTP_STAT_INCR(sctps_datadroprwnd);
1567 strmno = ntohs(ch->dp.stream_id);
1568 if (strmno >= asoc->streamincnt) {
1569 struct sctp_paramhdr *phdr;
1572 mb = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) * 2),
1573 0, M_DONTWAIT, 1, MT_DATA);
1575 /* add some space up front so prepend will work well */
1576 SCTP_BUF_RESV_UF(mb, sizeof(struct sctp_chunkhdr));
1577 phdr = mtod(mb, struct sctp_paramhdr *);
1579 * Error causes are just param's and this one has
1580 * two back to back phdr, one with the error type
1581 * and size, the other with the streamid and a rsvd
1583 SCTP_BUF_LEN(mb) = (sizeof(struct sctp_paramhdr) * 2);
1584 phdr->param_type = htons(SCTP_CAUSE_INVALID_STREAM);
1585 phdr->param_length =
1586 htons(sizeof(struct sctp_paramhdr) * 2);
1588 /* We insert the stream in the type field */
1589 phdr->param_type = ch->dp.stream_id;
1590 /* And set the length to 0 for the rsvd field */
1591 phdr->param_length = 0;
1592 sctp_queue_op_err(stcb, mb);
1594 SCTP_STAT_INCR(sctps_badsid);
1595 SCTP_TCB_LOCK_ASSERT(stcb);
1596 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap);
1597 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) {
1598 asoc->highest_tsn_inside_nr_map = tsn;
1600 if (tsn == (asoc->cumulative_tsn + 1)) {
1601 /* Update cum-ack */
1602 asoc->cumulative_tsn = tsn;
1607 * Before we continue lets validate that we are not being fooled by
1608 * an evil attacker. We can only have 4k chunks based on our TSN
1609 * spread allowed by the mapping array 512 * 8 bits, so there is no
1610 * way our stream sequence numbers could have wrapped. We of course
1611 * only validate the FIRST fragment so the bit must be set.
1613 strmseq = ntohs(ch->dp.stream_sequence);
1614 #ifdef SCTP_ASOCLOG_OF_TSNS
1615 SCTP_TCB_LOCK_ASSERT(stcb);
1616 if (asoc->tsn_in_at >= SCTP_TSN_LOG_SIZE) {
1617 asoc->tsn_in_at = 0;
1618 asoc->tsn_in_wrapped = 1;
1620 asoc->in_tsnlog[asoc->tsn_in_at].tsn = tsn;
1621 asoc->in_tsnlog[asoc->tsn_in_at].strm = strmno;
1622 asoc->in_tsnlog[asoc->tsn_in_at].seq = strmseq;
1623 asoc->in_tsnlog[asoc->tsn_in_at].sz = chk_length;
1624 asoc->in_tsnlog[asoc->tsn_in_at].flgs = chunk_flags;
1625 asoc->in_tsnlog[asoc->tsn_in_at].stcb = (void *)stcb;
1626 asoc->in_tsnlog[asoc->tsn_in_at].in_pos = asoc->tsn_in_at;
1627 asoc->in_tsnlog[asoc->tsn_in_at].in_out = 1;
1630 if ((chunk_flags & SCTP_DATA_FIRST_FRAG) &&
1631 (TAILQ_EMPTY(&asoc->resetHead)) &&
1632 (chunk_flags & SCTP_DATA_UNORDERED) == 0 &&
1633 SCTP_SSN_GE(asoc->strmin[strmno].last_sequence_delivered, strmseq)) {
1634 /* The incoming sseq is behind where we last delivered? */
1635 SCTPDBG(SCTP_DEBUG_INDATA1, "EVIL/Broken-Dup S-SEQ:%d delivered:%d from peer, Abort!\n",
1636 strmseq, asoc->strmin[strmno].last_sequence_delivered);
1637 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
1638 0, M_DONTWAIT, 1, MT_DATA);
1640 struct sctp_paramhdr *ph;
1643 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
1644 (3 * sizeof(uint32_t));
1645 ph = mtod(oper, struct sctp_paramhdr *);
1646 ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
1647 ph->param_length = htons(SCTP_BUF_LEN(oper));
1648 ippp = (uint32_t *) (ph + 1);
1649 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_14);
1653 *ippp = ((strmno << 16) | strmseq);
1656 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_14;
1657 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED);
1661 /************************************
1662 * From here down we may find ch-> invalid
1663 * so its a good idea NOT to use it.
1664 *************************************/
1666 the_len = (chk_length - sizeof(struct sctp_data_chunk));
1667 if (last_chunk == 0) {
1668 dmbuf = SCTP_M_COPYM(*m,
1669 (offset + sizeof(struct sctp_data_chunk)),
1670 the_len, M_DONTWAIT);
1671 #ifdef SCTP_MBUF_LOGGING
1672 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
1675 for (mat = dmbuf; mat; mat = SCTP_BUF_NEXT(mat)) {
1676 if (SCTP_BUF_IS_EXTENDED(mat)) {
1677 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
1683 /* We can steal the last chunk */
1687 /* lop off the top part */
1688 m_adj(dmbuf, (offset + sizeof(struct sctp_data_chunk)));
1689 if (SCTP_BUF_NEXT(dmbuf) == NULL) {
1690 l_len = SCTP_BUF_LEN(dmbuf);
1693 * need to count up the size hopefully does not hit
1699 for (lat = dmbuf; lat; lat = SCTP_BUF_NEXT(lat)) {
1700 l_len += SCTP_BUF_LEN(lat);
1703 if (l_len > the_len) {
1704 /* Trim the end round bytes off too */
1705 m_adj(dmbuf, -(l_len - the_len));
1708 if (dmbuf == NULL) {
1709 SCTP_STAT_INCR(sctps_nomem);
1712 if ((chunk_flags & SCTP_DATA_NOT_FRAG) == SCTP_DATA_NOT_FRAG &&
1713 asoc->fragmented_delivery_inprogress == 0 &&
1714 TAILQ_EMPTY(&asoc->resetHead) &&
1716 ((uint16_t) (asoc->strmin[strmno].last_sequence_delivered + 1) == strmseq &&
1717 TAILQ_EMPTY(&asoc->strmin[strmno].inqueue)))) {
1718 /* Candidate for express delivery */
1720 * Its not fragmented, No PD-API is up, Nothing in the
1721 * delivery queue, Its un-ordered OR ordered and the next to
1722 * deliver AND nothing else is stuck on the stream queue,
1723 * And there is room for it in the socket buffer. Lets just
1724 * stuff it up the buffer....
1727 /* It would be nice to avoid this copy if we could :< */
1728 sctp_alloc_a_readq(stcb, control);
1729 sctp_build_readq_entry_mac(control, stcb, asoc->context, net, tsn,
1734 if (control == NULL) {
1735 goto failed_express_del;
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 sctp_add_to_readq(stcb->sctp_ep, stcb,
1742 control, &stcb->sctp_socket->so_rcv,
1743 1, SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED);
1745 if ((chunk_flags & SCTP_DATA_UNORDERED) == 0) {
1746 /* for ordered, bump what we delivered */
1747 asoc->strmin[strmno].last_sequence_delivered++;
1749 SCTP_STAT_INCR(sctps_recvexpress);
1750 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
1751 sctp_log_strm_del_alt(stcb, tsn, strmseq, strmno,
1752 SCTP_STR_LOG_FROM_EXPRS_DEL);
1756 goto finish_express_del;
1759 /* If we reach here this is a new chunk */
1762 /* Express for fragmented delivery? */
1763 if ((asoc->fragmented_delivery_inprogress) &&
1764 (stcb->asoc.control_pdapi) &&
1765 (asoc->str_of_pdapi == strmno) &&
1766 (asoc->ssn_of_pdapi == strmseq)
1768 control = stcb->asoc.control_pdapi;
1769 if ((chunk_flags & SCTP_DATA_FIRST_FRAG) == SCTP_DATA_FIRST_FRAG) {
1770 /* Can't be another first? */
1771 goto failed_pdapi_express_del;
1773 if (tsn == (control->sinfo_tsn + 1)) {
1774 /* Yep, we can add it on */
1777 if (chunk_flags & SCTP_DATA_LAST_FRAG) {
1780 if (sctp_append_to_readq(stcb->sctp_ep, stcb, control, dmbuf, end,
1782 &stcb->sctp_socket->so_rcv)) {
1783 SCTP_PRINTF("Append fails end:%d\n", end);
1784 goto failed_pdapi_express_del;
1786 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap);
1787 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) {
1788 asoc->highest_tsn_inside_nr_map = tsn;
1790 SCTP_STAT_INCR(sctps_recvexpressm);
1791 control->sinfo_tsn = tsn;
1792 asoc->tsn_last_delivered = tsn;
1793 asoc->fragment_flags = chunk_flags;
1794 asoc->tsn_of_pdapi_last_delivered = tsn;
1795 asoc->last_flags_delivered = chunk_flags;
1796 asoc->last_strm_seq_delivered = strmseq;
1797 asoc->last_strm_no_delivered = strmno;
1799 /* clean up the flags and such */
1800 asoc->fragmented_delivery_inprogress = 0;
1801 if ((chunk_flags & SCTP_DATA_UNORDERED) == 0) {
1802 asoc->strmin[strmno].last_sequence_delivered++;
1804 stcb->asoc.control_pdapi = NULL;
1805 if (TAILQ_EMPTY(&asoc->reasmqueue) == 0) {
1807 * There could be another message
1810 need_reasm_check = 1;
1814 goto finish_express_del;
1817 failed_pdapi_express_del:
1819 if (SCTP_BASE_SYSCTL(sctp_do_drain) == 0) {
1820 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap);
1821 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) {
1822 asoc->highest_tsn_inside_nr_map = tsn;
1825 SCTP_SET_TSN_PRESENT(asoc->mapping_array, gap);
1826 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_map)) {
1827 asoc->highest_tsn_inside_map = tsn;
1830 if ((chunk_flags & SCTP_DATA_NOT_FRAG) != SCTP_DATA_NOT_FRAG) {
1831 sctp_alloc_a_chunk(stcb, chk);
1833 /* No memory so we drop the chunk */
1834 SCTP_STAT_INCR(sctps_nomem);
1835 if (last_chunk == 0) {
1836 /* we copied it, free the copy */
1837 sctp_m_freem(dmbuf);
1841 chk->rec.data.TSN_seq = tsn;
1842 chk->no_fr_allowed = 0;
1843 chk->rec.data.stream_seq = strmseq;
1844 chk->rec.data.stream_number = strmno;
1845 chk->rec.data.payloadtype = protocol_id;
1846 chk->rec.data.context = stcb->asoc.context;
1847 chk->rec.data.doing_fast_retransmit = 0;
1848 chk->rec.data.rcv_flags = chunk_flags;
1850 chk->send_size = the_len;
1852 atomic_add_int(&net->ref_count, 1);
1855 sctp_alloc_a_readq(stcb, control);
1856 sctp_build_readq_entry_mac(control, stcb, asoc->context, net, tsn,
1861 if (control == NULL) {
1862 /* No memory so we drop the chunk */
1863 SCTP_STAT_INCR(sctps_nomem);
1864 if (last_chunk == 0) {
1865 /* we copied it, free the copy */
1866 sctp_m_freem(dmbuf);
1870 control->length = the_len;
1873 /* Mark it as received */
1874 /* Now queue it where it belongs */
1875 if (control != NULL) {
1876 /* First a sanity check */
1877 if (asoc->fragmented_delivery_inprogress) {
1879 * Ok, we have a fragmented delivery in progress if
1880 * this chunk is next to deliver OR belongs in our
1881 * view to the reassembly, the peer is evil or
1884 uint32_t estimate_tsn;
1886 estimate_tsn = asoc->tsn_last_delivered + 1;
1887 if (TAILQ_EMPTY(&asoc->reasmqueue) &&
1888 (estimate_tsn == control->sinfo_tsn)) {
1889 /* Evil/Broke peer */
1890 sctp_m_freem(control->data);
1891 control->data = NULL;
1892 if (control->whoFrom) {
1893 sctp_free_remote_addr(control->whoFrom);
1894 control->whoFrom = NULL;
1896 sctp_free_a_readq(stcb, control);
1897 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
1898 0, M_DONTWAIT, 1, MT_DATA);
1900 struct sctp_paramhdr *ph;
1903 SCTP_BUF_LEN(oper) =
1904 sizeof(struct sctp_paramhdr) +
1905 (3 * sizeof(uint32_t));
1906 ph = mtod(oper, struct sctp_paramhdr *);
1908 htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
1909 ph->param_length = htons(SCTP_BUF_LEN(oper));
1910 ippp = (uint32_t *) (ph + 1);
1911 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_15);
1915 *ippp = ((strmno << 16) | strmseq);
1917 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_15;
1918 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED);
1922 if (sctp_does_tsn_belong_to_reasm(asoc, control->sinfo_tsn)) {
1923 sctp_m_freem(control->data);
1924 control->data = NULL;
1925 if (control->whoFrom) {
1926 sctp_free_remote_addr(control->whoFrom);
1927 control->whoFrom = NULL;
1929 sctp_free_a_readq(stcb, control);
1931 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
1932 0, M_DONTWAIT, 1, MT_DATA);
1934 struct sctp_paramhdr *ph;
1937 SCTP_BUF_LEN(oper) =
1938 sizeof(struct sctp_paramhdr) +
1939 (3 * sizeof(uint32_t));
1941 struct sctp_paramhdr *);
1943 htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
1945 htons(SCTP_BUF_LEN(oper));
1946 ippp = (uint32_t *) (ph + 1);
1947 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_16);
1951 *ippp = ((strmno << 16) | strmseq);
1953 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_16;
1954 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED);
1960 /* No PDAPI running */
1961 if (!TAILQ_EMPTY(&asoc->reasmqueue)) {
1963 * Reassembly queue is NOT empty validate
1964 * that this tsn does not need to be in
1965 * reasembly queue. If it does then our peer
1966 * is broken or evil.
1968 if (sctp_does_tsn_belong_to_reasm(asoc, control->sinfo_tsn)) {
1969 sctp_m_freem(control->data);
1970 control->data = NULL;
1971 if (control->whoFrom) {
1972 sctp_free_remote_addr(control->whoFrom);
1973 control->whoFrom = NULL;
1975 sctp_free_a_readq(stcb, control);
1976 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
1977 0, M_DONTWAIT, 1, MT_DATA);
1979 struct sctp_paramhdr *ph;
1982 SCTP_BUF_LEN(oper) =
1983 sizeof(struct sctp_paramhdr) +
1984 (3 * sizeof(uint32_t));
1986 struct sctp_paramhdr *);
1988 htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
1990 htons(SCTP_BUF_LEN(oper));
1991 ippp = (uint32_t *) (ph + 1);
1992 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_17);
1996 *ippp = ((strmno << 16) | strmseq);
1998 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_17;
1999 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED);
2005 /* ok, if we reach here we have passed the sanity checks */
2006 if (chunk_flags & SCTP_DATA_UNORDERED) {
2007 /* queue directly into socket buffer */
2008 sctp_mark_non_revokable(asoc, control->sinfo_tsn);
2009 sctp_add_to_readq(stcb->sctp_ep, stcb,
2011 &stcb->sctp_socket->so_rcv, 1, SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED);
2014 * Special check for when streams are resetting. We
2015 * could be more smart about this and check the
2016 * actual stream to see if it is not being reset..
2017 * that way we would not create a HOLB when amongst
2018 * streams being reset and those not being reset.
2020 * We take complete messages that have a stream reset
2021 * intervening (aka the TSN is after where our
2022 * cum-ack needs to be) off and put them on a
2023 * pending_reply_queue. The reassembly ones we do
2024 * not have to worry about since they are all sorted
2025 * and proceessed by TSN order. It is only the
2026 * singletons I must worry about.
2028 if (((liste = TAILQ_FIRST(&asoc->resetHead)) != NULL) &&
2029 SCTP_TSN_GT(tsn, liste->tsn)) {
2031 * yep its past where we need to reset... go
2032 * ahead and queue it.
2034 if (TAILQ_EMPTY(&asoc->pending_reply_queue)) {
2036 TAILQ_INSERT_TAIL(&asoc->pending_reply_queue, control, next);
2038 struct sctp_queued_to_read *ctlOn,
2040 unsigned char inserted = 0;
2042 TAILQ_FOREACH_SAFE(ctlOn, &asoc->pending_reply_queue, next, nctlOn) {
2043 if (SCTP_TSN_GT(control->sinfo_tsn, ctlOn->sinfo_tsn)) {
2047 TAILQ_INSERT_BEFORE(ctlOn, control, next);
2052 if (inserted == 0) {
2054 * must be put at end, use
2055 * prevP (all setup from
2056 * loop) to setup nextP.
2058 TAILQ_INSERT_TAIL(&asoc->pending_reply_queue, control, next);
2062 sctp_queue_data_to_stream(stcb, asoc, control, abort_flag);
2069 /* Into the re-assembly queue */
2070 sctp_queue_data_for_reasm(stcb, asoc, chk, abort_flag);
2073 * the assoc is now gone and chk was put onto the
2074 * reasm queue, which has all been freed.
2081 if (tsn == (asoc->cumulative_tsn + 1)) {
2082 /* Update cum-ack */
2083 asoc->cumulative_tsn = tsn;
2089 SCTP_STAT_INCR_COUNTER64(sctps_inorderchunks);
2091 SCTP_STAT_INCR_COUNTER64(sctps_inunorderchunks);
2093 SCTP_STAT_INCR(sctps_recvdata);
2094 /* Set it present please */
2095 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
2096 sctp_log_strm_del_alt(stcb, tsn, strmseq, strmno, SCTP_STR_LOG_FROM_MARK_TSN);
2098 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
2099 sctp_log_map(asoc->mapping_array_base_tsn, asoc->cumulative_tsn,
2100 asoc->highest_tsn_inside_map, SCTP_MAP_PREPARE_SLIDE);
2102 /* check the special flag for stream resets */
2103 if (((liste = TAILQ_FIRST(&asoc->resetHead)) != NULL) &&
2104 SCTP_TSN_GE(asoc->cumulative_tsn, liste->tsn)) {
2106 * we have finished working through the backlogged TSN's now
2107 * time to reset streams. 1: call reset function. 2: free
2108 * pending_reply space 3: distribute any chunks in
2109 * pending_reply_queue.
2111 struct sctp_queued_to_read *ctl, *nctl;
2113 sctp_reset_in_stream(stcb, liste->number_entries, liste->list_of_streams);
2114 TAILQ_REMOVE(&asoc->resetHead, liste, next_resp);
2115 SCTP_FREE(liste, SCTP_M_STRESET);
2116 /* sa_ignore FREED_MEMORY */
2117 liste = TAILQ_FIRST(&asoc->resetHead);
2118 if (TAILQ_EMPTY(&asoc->resetHead)) {
2119 /* All can be removed */
2120 TAILQ_FOREACH_SAFE(ctl, &asoc->pending_reply_queue, next, nctl) {
2121 TAILQ_REMOVE(&asoc->pending_reply_queue, ctl, next);
2122 sctp_queue_data_to_stream(stcb, asoc, ctl, abort_flag);
2128 TAILQ_FOREACH_SAFE(ctl, &asoc->pending_reply_queue, next, nctl) {
2129 if (SCTP_TSN_GT(ctl->sinfo_tsn, liste->tsn)) {
2133 * if ctl->sinfo_tsn is <= liste->tsn we can
2134 * process it which is the NOT of
2135 * ctl->sinfo_tsn > liste->tsn
2137 TAILQ_REMOVE(&asoc->pending_reply_queue, ctl, next);
2138 sctp_queue_data_to_stream(stcb, asoc, ctl, abort_flag);
2145 * Now service re-assembly to pick up anything that has been
2146 * held on reassembly queue?
2148 sctp_deliver_reasm_check(stcb, asoc);
2149 need_reasm_check = 0;
2151 if (need_reasm_check) {
2152 /* Another one waits ? */
2153 sctp_deliver_reasm_check(stcb, asoc);
2158 int8_t sctp_map_lookup_tab[256] = {
2159 0, 1, 0, 2, 0, 1, 0, 3,
2160 0, 1, 0, 2, 0, 1, 0, 4,
2161 0, 1, 0, 2, 0, 1, 0, 3,
2162 0, 1, 0, 2, 0, 1, 0, 5,
2163 0, 1, 0, 2, 0, 1, 0, 3,
2164 0, 1, 0, 2, 0, 1, 0, 4,
2165 0, 1, 0, 2, 0, 1, 0, 3,
2166 0, 1, 0, 2, 0, 1, 0, 6,
2167 0, 1, 0, 2, 0, 1, 0, 3,
2168 0, 1, 0, 2, 0, 1, 0, 4,
2169 0, 1, 0, 2, 0, 1, 0, 3,
2170 0, 1, 0, 2, 0, 1, 0, 5,
2171 0, 1, 0, 2, 0, 1, 0, 3,
2172 0, 1, 0, 2, 0, 1, 0, 4,
2173 0, 1, 0, 2, 0, 1, 0, 3,
2174 0, 1, 0, 2, 0, 1, 0, 7,
2175 0, 1, 0, 2, 0, 1, 0, 3,
2176 0, 1, 0, 2, 0, 1, 0, 4,
2177 0, 1, 0, 2, 0, 1, 0, 3,
2178 0, 1, 0, 2, 0, 1, 0, 5,
2179 0, 1, 0, 2, 0, 1, 0, 3,
2180 0, 1, 0, 2, 0, 1, 0, 4,
2181 0, 1, 0, 2, 0, 1, 0, 3,
2182 0, 1, 0, 2, 0, 1, 0, 6,
2183 0, 1, 0, 2, 0, 1, 0, 3,
2184 0, 1, 0, 2, 0, 1, 0, 4,
2185 0, 1, 0, 2, 0, 1, 0, 3,
2186 0, 1, 0, 2, 0, 1, 0, 5,
2187 0, 1, 0, 2, 0, 1, 0, 3,
2188 0, 1, 0, 2, 0, 1, 0, 4,
2189 0, 1, 0, 2, 0, 1, 0, 3,
2190 0, 1, 0, 2, 0, 1, 0, 8
2195 sctp_slide_mapping_arrays(struct sctp_tcb *stcb)
2198 * Now we also need to check the mapping array in a couple of ways.
2199 * 1) Did we move the cum-ack point?
2201 * When you first glance at this you might think that all entries that
2202 * make up the postion of the cum-ack would be in the nr-mapping
2203 * array only.. i.e. things up to the cum-ack are always
2204 * deliverable. Thats true with one exception, when its a fragmented
2205 * message we may not deliver the data until some threshold (or all
2206 * of it) is in place. So we must OR the nr_mapping_array and
2207 * mapping_array to get a true picture of the cum-ack.
2209 struct sctp_association *asoc;
2212 int slide_from, slide_end, lgap, distance;
2213 uint32_t old_cumack, old_base, old_highest, highest_tsn;
2217 old_cumack = asoc->cumulative_tsn;
2218 old_base = asoc->mapping_array_base_tsn;
2219 old_highest = asoc->highest_tsn_inside_map;
2221 * We could probably improve this a small bit by calculating the
2222 * offset of the current cum-ack as the starting point.
2225 for (slide_from = 0; slide_from < stcb->asoc.mapping_array_size; slide_from++) {
2226 val = asoc->nr_mapping_array[slide_from] | asoc->mapping_array[slide_from];
2230 /* there is a 0 bit */
2231 at += sctp_map_lookup_tab[val];
2235 asoc->cumulative_tsn = asoc->mapping_array_base_tsn + (at - 1);
2237 if (SCTP_TSN_GT(asoc->cumulative_tsn, asoc->highest_tsn_inside_map) &&
2238 SCTP_TSN_GT(asoc->cumulative_tsn, asoc->highest_tsn_inside_nr_map)) {
2240 panic("huh, cumack 0x%x greater than high-tsn 0x%x in map",
2241 asoc->cumulative_tsn, asoc->highest_tsn_inside_map);
2243 SCTP_PRINTF("huh, cumack 0x%x greater than high-tsn 0x%x in map - should panic?\n",
2244 asoc->cumulative_tsn, asoc->highest_tsn_inside_map);
2245 sctp_print_mapping_array(asoc);
2246 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
2247 sctp_log_map(0, 6, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
2249 asoc->highest_tsn_inside_map = asoc->cumulative_tsn;
2250 asoc->highest_tsn_inside_nr_map = asoc->cumulative_tsn;
2253 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->highest_tsn_inside_map)) {
2254 highest_tsn = asoc->highest_tsn_inside_nr_map;
2256 highest_tsn = asoc->highest_tsn_inside_map;
2258 if ((asoc->cumulative_tsn == highest_tsn) && (at >= 8)) {
2259 /* The complete array was completed by a single FR */
2260 /* highest becomes the cum-ack */
2268 /* clear the array */
2269 clr = ((at + 7) >> 3);
2270 if (clr > asoc->mapping_array_size) {
2271 clr = asoc->mapping_array_size;
2273 memset(asoc->mapping_array, 0, clr);
2274 memset(asoc->nr_mapping_array, 0, clr);
2276 for (i = 0; i < asoc->mapping_array_size; i++) {
2277 if ((asoc->mapping_array[i]) || (asoc->nr_mapping_array[i])) {
2278 SCTP_PRINTF("Error Mapping array's not clean at clear\n");
2279 sctp_print_mapping_array(asoc);
2283 asoc->mapping_array_base_tsn = asoc->cumulative_tsn + 1;
2284 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map = asoc->cumulative_tsn;
2285 } else if (at >= 8) {
2286 /* we can slide the mapping array down */
2287 /* slide_from holds where we hit the first NON 0xff byte */
2290 * now calculate the ceiling of the move using our highest
2293 SCTP_CALC_TSN_TO_GAP(lgap, highest_tsn, asoc->mapping_array_base_tsn);
2294 slide_end = (lgap >> 3);
2295 if (slide_end < slide_from) {
2296 sctp_print_mapping_array(asoc);
2298 panic("impossible slide");
2300 SCTP_PRINTF("impossible slide lgap:%x slide_end:%x slide_from:%x? at:%d\n",
2301 lgap, slide_end, slide_from, at);
2305 if (slide_end > asoc->mapping_array_size) {
2307 panic("would overrun buffer");
2309 SCTP_PRINTF("Gak, would have overrun map end:%d slide_end:%d\n",
2310 asoc->mapping_array_size, slide_end);
2311 slide_end = asoc->mapping_array_size;
2314 distance = (slide_end - slide_from) + 1;
2315 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
2316 sctp_log_map(old_base, old_cumack, old_highest,
2317 SCTP_MAP_PREPARE_SLIDE);
2318 sctp_log_map((uint32_t) slide_from, (uint32_t) slide_end,
2319 (uint32_t) lgap, SCTP_MAP_SLIDE_FROM);
2321 if (distance + slide_from > asoc->mapping_array_size ||
2324 * Here we do NOT slide forward the array so that
2325 * hopefully when more data comes in to fill it up
2326 * we will be able to slide it forward. Really I
2327 * don't think this should happen :-0
2330 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
2331 sctp_log_map((uint32_t) distance, (uint32_t) slide_from,
2332 (uint32_t) asoc->mapping_array_size,
2333 SCTP_MAP_SLIDE_NONE);
2338 for (ii = 0; ii < distance; ii++) {
2339 asoc->mapping_array[ii] = asoc->mapping_array[slide_from + ii];
2340 asoc->nr_mapping_array[ii] = asoc->nr_mapping_array[slide_from + ii];
2343 for (ii = distance; ii < asoc->mapping_array_size; ii++) {
2344 asoc->mapping_array[ii] = 0;
2345 asoc->nr_mapping_array[ii] = 0;
2347 if (asoc->highest_tsn_inside_map + 1 == asoc->mapping_array_base_tsn) {
2348 asoc->highest_tsn_inside_map += (slide_from << 3);
2350 if (asoc->highest_tsn_inside_nr_map + 1 == asoc->mapping_array_base_tsn) {
2351 asoc->highest_tsn_inside_nr_map += (slide_from << 3);
2353 asoc->mapping_array_base_tsn += (slide_from << 3);
2354 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
2355 sctp_log_map(asoc->mapping_array_base_tsn,
2356 asoc->cumulative_tsn, asoc->highest_tsn_inside_map,
2357 SCTP_MAP_SLIDE_RESULT);
2364 sctp_sack_check(struct sctp_tcb *stcb, int was_a_gap)
2366 struct sctp_association *asoc;
2367 uint32_t highest_tsn;
2370 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->highest_tsn_inside_map)) {
2371 highest_tsn = asoc->highest_tsn_inside_nr_map;
2373 highest_tsn = asoc->highest_tsn_inside_map;
2377 * Now we need to see if we need to queue a sack or just start the
2378 * timer (if allowed).
2380 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
2382 * Ok special case, in SHUTDOWN-SENT case. here we maker
2383 * sure SACK timer is off and instead send a SHUTDOWN and a
2386 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
2387 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
2388 stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_INDATA + SCTP_LOC_18);
2390 sctp_send_shutdown(stcb,
2391 ((stcb->asoc.alternate) ? stcb->asoc.alternate : stcb->asoc.primary_destination));
2392 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
2396 /* is there a gap now ? */
2397 is_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
2400 * CMT DAC algorithm: increase number of packets received
2403 stcb->asoc.cmt_dac_pkts_rcvd++;
2405 if ((stcb->asoc.send_sack == 1) || /* We need to send a
2407 ((was_a_gap) && (is_a_gap == 0)) || /* was a gap, but no
2409 (stcb->asoc.numduptsns) || /* we have dup's */
2410 (is_a_gap) || /* is still a gap */
2411 (stcb->asoc.delayed_ack == 0) || /* Delayed sack disabled */
2412 (stcb->asoc.data_pkts_seen >= stcb->asoc.sack_freq) /* hit limit of pkts */
2415 if ((stcb->asoc.sctp_cmt_on_off > 0) &&
2416 (SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) &&
2417 (stcb->asoc.send_sack == 0) &&
2418 (stcb->asoc.numduptsns == 0) &&
2419 (stcb->asoc.delayed_ack) &&
2420 (!SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer))) {
2423 * CMT DAC algorithm: With CMT, delay acks
2424 * even in the face of
2426 * reordering. Therefore, if acks that do not
2427 * have to be sent because of the above
2428 * reasons, will be delayed. That is, acks
2429 * that would have been sent due to gap
2430 * reports will be delayed with DAC. Start
2431 * the delayed ack timer.
2433 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
2434 stcb->sctp_ep, stcb, NULL);
2437 * Ok we must build a SACK since the timer
2438 * is pending, we got our first packet OR
2439 * there are gaps or duplicates.
2441 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
2442 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
2445 if (!SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
2446 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
2447 stcb->sctp_ep, stcb, NULL);
2454 sctp_service_queues(struct sctp_tcb *stcb, struct sctp_association *asoc)
2456 struct sctp_tmit_chunk *chk;
2457 uint32_t tsize, pd_point;
2460 if (asoc->fragmented_delivery_inprogress) {
2461 sctp_service_reassembly(stcb, asoc);
2463 /* Can we proceed further, i.e. the PD-API is complete */
2464 if (asoc->fragmented_delivery_inprogress) {
2469 * Now is there some other chunk I can deliver from the reassembly
2473 chk = TAILQ_FIRST(&asoc->reasmqueue);
2475 asoc->size_on_reasm_queue = 0;
2476 asoc->cnt_on_reasm_queue = 0;
2479 nxt_todel = asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered + 1;
2480 if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) &&
2481 ((nxt_todel == chk->rec.data.stream_seq) ||
2482 (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED))) {
2484 * Yep the first one is here. We setup to start reception,
2485 * by backing down the TSN just in case we can't deliver.
2489 * Before we start though either all of the message should
2490 * be here or the socket buffer max or nothing on the
2491 * delivery queue and something can be delivered.
2493 if (stcb->sctp_socket) {
2494 pd_point = min(SCTP_SB_LIMIT_RCV(stcb->sctp_socket),
2495 stcb->sctp_ep->partial_delivery_point);
2497 pd_point = stcb->sctp_ep->partial_delivery_point;
2499 if (sctp_is_all_msg_on_reasm(asoc, &tsize) || (tsize >= pd_point)) {
2500 asoc->fragmented_delivery_inprogress = 1;
2501 asoc->tsn_last_delivered = chk->rec.data.TSN_seq - 1;
2502 asoc->str_of_pdapi = chk->rec.data.stream_number;
2503 asoc->ssn_of_pdapi = chk->rec.data.stream_seq;
2504 asoc->pdapi_ppid = chk->rec.data.payloadtype;
2505 asoc->fragment_flags = chk->rec.data.rcv_flags;
2506 sctp_service_reassembly(stcb, asoc);
2507 if (asoc->fragmented_delivery_inprogress == 0) {
2515 sctp_process_data(struct mbuf **mm, int iphlen, int *offset, int length,
2516 struct sockaddr *src, struct sockaddr *dst,
2517 struct sctphdr *sh, struct sctp_inpcb *inp,
2518 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t * high_tsn,
2519 uint8_t use_mflowid, uint32_t mflowid,
2520 uint32_t vrf_id, uint16_t port)
2522 struct sctp_data_chunk *ch, chunk_buf;
2523 struct sctp_association *asoc;
2524 int num_chunks = 0; /* number of control chunks processed */
2526 int chk_length, break_flag, last_chunk;
2527 int abort_flag = 0, was_a_gap;
2529 uint32_t highest_tsn;
2532 sctp_set_rwnd(stcb, &stcb->asoc);
2535 SCTP_TCB_LOCK_ASSERT(stcb);
2537 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->highest_tsn_inside_map)) {
2538 highest_tsn = asoc->highest_tsn_inside_nr_map;
2540 highest_tsn = asoc->highest_tsn_inside_map;
2542 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
2544 * setup where we got the last DATA packet from for any SACK that
2545 * may need to go out. Don't bump the net. This is done ONLY when a
2546 * chunk is assigned.
2548 asoc->last_data_chunk_from = net;
2551 * Now before we proceed we must figure out if this is a wasted
2552 * cluster... i.e. it is a small packet sent in and yet the driver
2553 * underneath allocated a full cluster for it. If so we must copy it
2554 * to a smaller mbuf and free up the cluster mbuf. This will help
2555 * with cluster starvation. Note for __Panda__ we don't do this
2556 * since it has clusters all the way down to 64 bytes.
2558 if (SCTP_BUF_LEN(m) < (long)MLEN && SCTP_BUF_NEXT(m) == NULL) {
2559 /* we only handle mbufs that are singletons.. not chains */
2560 m = sctp_get_mbuf_for_msg(SCTP_BUF_LEN(m), 0, M_DONTWAIT, 1, MT_DATA);
2562 /* ok lets see if we can copy the data up */
2565 /* get the pointers and copy */
2566 to = mtod(m, caddr_t *);
2567 from = mtod((*mm), caddr_t *);
2568 memcpy(to, from, SCTP_BUF_LEN((*mm)));
2569 /* copy the length and free up the old */
2570 SCTP_BUF_LEN(m) = SCTP_BUF_LEN((*mm));
2572 /* sucess, back copy */
2575 /* We are in trouble in the mbuf world .. yikes */
2579 /* get pointer to the first chunk header */
2580 ch = (struct sctp_data_chunk *)sctp_m_getptr(m, *offset,
2581 sizeof(struct sctp_data_chunk), (uint8_t *) & chunk_buf);
2586 * process all DATA chunks...
2588 *high_tsn = asoc->cumulative_tsn;
2590 asoc->data_pkts_seen++;
2591 while (stop_proc == 0) {
2592 /* validate chunk length */
2593 chk_length = ntohs(ch->ch.chunk_length);
2594 if (length - *offset < chk_length) {
2595 /* all done, mutulated chunk */
2599 if (ch->ch.chunk_type == SCTP_DATA) {
2600 if ((size_t)chk_length < sizeof(struct sctp_data_chunk) + 1) {
2602 * Need to send an abort since we had a
2603 * invalid data chunk.
2605 struct mbuf *op_err;
2607 op_err = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 2 * sizeof(uint32_t)),
2608 0, M_DONTWAIT, 1, MT_DATA);
2611 struct sctp_paramhdr *ph;
2614 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr) +
2615 (2 * sizeof(uint32_t));
2616 ph = mtod(op_err, struct sctp_paramhdr *);
2618 htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
2619 ph->param_length = htons(SCTP_BUF_LEN(op_err));
2620 ippp = (uint32_t *) (ph + 1);
2621 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_19);
2623 *ippp = asoc->cumulative_tsn;
2626 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_19;
2627 sctp_abort_association(inp, stcb, m, iphlen,
2628 src, dst, sh, op_err,
2629 use_mflowid, mflowid,
2633 #ifdef SCTP_AUDITING_ENABLED
2634 sctp_audit_log(0xB1, 0);
2636 if (SCTP_SIZE32(chk_length) == (length - *offset)) {
2641 if (sctp_process_a_data_chunk(stcb, asoc, mm, *offset, ch,
2642 chk_length, net, high_tsn, &abort_flag, &break_flag,
2651 * Set because of out of rwnd space and no
2652 * drop rep space left.
2658 /* not a data chunk in the data region */
2659 switch (ch->ch.chunk_type) {
2660 case SCTP_INITIATION:
2661 case SCTP_INITIATION_ACK:
2662 case SCTP_SELECTIVE_ACK:
2663 case SCTP_NR_SELECTIVE_ACK:
2664 case SCTP_HEARTBEAT_REQUEST:
2665 case SCTP_HEARTBEAT_ACK:
2666 case SCTP_ABORT_ASSOCIATION:
2668 case SCTP_SHUTDOWN_ACK:
2669 case SCTP_OPERATION_ERROR:
2670 case SCTP_COOKIE_ECHO:
2671 case SCTP_COOKIE_ACK:
2674 case SCTP_SHUTDOWN_COMPLETE:
2675 case SCTP_AUTHENTICATION:
2676 case SCTP_ASCONF_ACK:
2677 case SCTP_PACKET_DROPPED:
2678 case SCTP_STREAM_RESET:
2679 case SCTP_FORWARD_CUM_TSN:
2682 * Now, what do we do with KNOWN chunks that
2683 * are NOT in the right place?
2685 * For now, I do nothing but ignore them. We
2686 * may later want to add sysctl stuff to
2687 * switch out and do either an ABORT() or
2688 * possibly process them.
2690 if (SCTP_BASE_SYSCTL(sctp_strict_data_order)) {
2691 struct mbuf *op_err;
2693 op_err = sctp_generate_invmanparam(SCTP_CAUSE_PROTOCOL_VIOLATION);
2694 sctp_abort_association(inp, stcb,
2698 use_mflowid, mflowid,
2704 /* unknown chunk type, use bit rules */
2705 if (ch->ch.chunk_type & 0x40) {
2706 /* Add a error report to the queue */
2708 struct sctp_paramhdr *phd;
2710 merr = sctp_get_mbuf_for_msg(sizeof(*phd), 0, M_DONTWAIT, 1, MT_DATA);
2712 phd = mtod(merr, struct sctp_paramhdr *);
2714 * We cheat and use param
2715 * type since we did not
2716 * bother to define a error
2717 * cause struct. They are
2718 * the same basic format
2719 * with different names.
2722 htons(SCTP_CAUSE_UNRECOG_CHUNK);
2724 htons(chk_length + sizeof(*phd));
2725 SCTP_BUF_LEN(merr) = sizeof(*phd);
2726 SCTP_BUF_NEXT(merr) = SCTP_M_COPYM(m, *offset, chk_length, M_DONTWAIT);
2727 if (SCTP_BUF_NEXT(merr)) {
2728 if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(merr), SCTP_SIZE32(chk_length) - chk_length, NULL)) {
2731 sctp_queue_op_err(stcb, merr);
2738 if ((ch->ch.chunk_type & 0x80) == 0) {
2739 /* discard the rest of this packet */
2741 } /* else skip this bad chunk and
2744 } /* switch of chunk type */
2746 *offset += SCTP_SIZE32(chk_length);
2747 if ((*offset >= length) || stop_proc) {
2748 /* no more data left in the mbuf chain */
2752 ch = (struct sctp_data_chunk *)sctp_m_getptr(m, *offset,
2753 sizeof(struct sctp_data_chunk), (uint8_t *) & chunk_buf);
2762 * we need to report rwnd overrun drops.
2764 sctp_send_packet_dropped(stcb, net, *mm, length, iphlen, 0);
2768 * Did we get data, if so update the time for auto-close and
2769 * give peer credit for being alive.
2771 SCTP_STAT_INCR(sctps_recvpktwithdata);
2772 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
2773 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
2774 stcb->asoc.overall_error_count,
2776 SCTP_FROM_SCTP_INDATA,
2779 stcb->asoc.overall_error_count = 0;
2780 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_last_rcvd);
2782 /* now service all of the reassm queue if needed */
2783 if (!(TAILQ_EMPTY(&asoc->reasmqueue)))
2784 sctp_service_queues(stcb, asoc);
2786 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
2787 /* Assure that we ack right away */
2788 stcb->asoc.send_sack = 1;
2790 /* Start a sack timer or QUEUE a SACK for sending */
2791 sctp_sack_check(stcb, was_a_gap);
2796 sctp_process_segment_range(struct sctp_tcb *stcb, struct sctp_tmit_chunk **p_tp1, uint32_t last_tsn,
2797 uint16_t frag_strt, uint16_t frag_end, int nr_sacking,
2799 uint32_t * biggest_newly_acked_tsn,
2800 uint32_t * this_sack_lowest_newack,
2803 struct sctp_tmit_chunk *tp1;
2804 unsigned int theTSN;
2805 int j, wake_him = 0, circled = 0;
2807 /* Recover the tp1 we last saw */
2810 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue);
2812 for (j = frag_strt; j <= frag_end; j++) {
2813 theTSN = j + last_tsn;
2815 if (tp1->rec.data.doing_fast_retransmit)
2819 * CMT: CUCv2 algorithm. For each TSN being
2820 * processed from the sent queue, track the
2821 * next expected pseudo-cumack, or
2822 * rtx_pseudo_cumack, if required. Separate
2823 * cumack trackers for first transmissions,
2824 * and retransmissions.
2826 if ((tp1->whoTo->find_pseudo_cumack == 1) && (tp1->sent < SCTP_DATAGRAM_RESEND) &&
2827 (tp1->snd_count == 1)) {
2828 tp1->whoTo->pseudo_cumack = tp1->rec.data.TSN_seq;
2829 tp1->whoTo->find_pseudo_cumack = 0;
2831 if ((tp1->whoTo->find_rtx_pseudo_cumack == 1) && (tp1->sent < SCTP_DATAGRAM_RESEND) &&
2832 (tp1->snd_count > 1)) {
2833 tp1->whoTo->rtx_pseudo_cumack = tp1->rec.data.TSN_seq;
2834 tp1->whoTo->find_rtx_pseudo_cumack = 0;
2836 if (tp1->rec.data.TSN_seq == theTSN) {
2837 if (tp1->sent != SCTP_DATAGRAM_UNSENT) {
2839 * must be held until
2842 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
2844 * If it is less than RESEND, it is
2845 * now no-longer in flight.
2846 * Higher values may already be set
2847 * via previous Gap Ack Blocks...
2848 * i.e. ACKED or RESEND.
2850 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq,
2851 *biggest_newly_acked_tsn)) {
2852 *biggest_newly_acked_tsn = tp1->rec.data.TSN_seq;
2855 * CMT: SFR algo (and HTNA) - set
2856 * saw_newack to 1 for dest being
2857 * newly acked. update
2858 * this_sack_highest_newack if
2861 if (tp1->rec.data.chunk_was_revoked == 0)
2862 tp1->whoTo->saw_newack = 1;
2864 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq,
2865 tp1->whoTo->this_sack_highest_newack)) {
2866 tp1->whoTo->this_sack_highest_newack =
2867 tp1->rec.data.TSN_seq;
2870 * CMT DAC algo: also update
2871 * this_sack_lowest_newack
2873 if (*this_sack_lowest_newack == 0) {
2874 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
2875 sctp_log_sack(*this_sack_lowest_newack,
2877 tp1->rec.data.TSN_seq,
2880 SCTP_LOG_TSN_ACKED);
2882 *this_sack_lowest_newack = tp1->rec.data.TSN_seq;
2885 * CMT: CUCv2 algorithm. If (rtx-)pseudo-cumack for corresp
2886 * dest is being acked, then we have a new (rtx-)pseudo-cumack. Set
2887 * new_(rtx_)pseudo_cumack to TRUE so that the cwnd for this dest can be
2888 * updated. Also trigger search for the next expected (rtx-)pseudo-cumack.
2889 * Separate pseudo_cumack trackers for first transmissions and
2892 if (tp1->rec.data.TSN_seq == tp1->whoTo->pseudo_cumack) {
2893 if (tp1->rec.data.chunk_was_revoked == 0) {
2894 tp1->whoTo->new_pseudo_cumack = 1;
2896 tp1->whoTo->find_pseudo_cumack = 1;
2898 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
2899 sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK);
2901 if (tp1->rec.data.TSN_seq == tp1->whoTo->rtx_pseudo_cumack) {
2902 if (tp1->rec.data.chunk_was_revoked == 0) {
2903 tp1->whoTo->new_pseudo_cumack = 1;
2905 tp1->whoTo->find_rtx_pseudo_cumack = 1;
2907 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
2908 sctp_log_sack(*biggest_newly_acked_tsn,
2910 tp1->rec.data.TSN_seq,
2913 SCTP_LOG_TSN_ACKED);
2915 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
2916 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_GAP,
2917 tp1->whoTo->flight_size,
2919 (uintptr_t) tp1->whoTo,
2920 tp1->rec.data.TSN_seq);
2922 sctp_flight_size_decrease(tp1);
2923 if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) {
2924 (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo,
2927 sctp_total_flight_decrease(stcb, tp1);
2929 tp1->whoTo->net_ack += tp1->send_size;
2930 if (tp1->snd_count < 2) {
2932 * True non-retransmited chunk
2934 tp1->whoTo->net_ack2 += tp1->send_size;
2942 sctp_calculate_rto(stcb,
2945 &tp1->sent_rcv_time,
2946 sctp_align_safe_nocopy,
2947 SCTP_RTT_FROM_DATA);
2950 if (tp1->whoTo->rto_needed == 0) {
2951 tp1->whoTo->rto_needed = 1;
2957 if (tp1->sent <= SCTP_DATAGRAM_RESEND) {
2958 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq,
2959 stcb->asoc.this_sack_highest_gap)) {
2960 stcb->asoc.this_sack_highest_gap =
2961 tp1->rec.data.TSN_seq;
2963 if (tp1->sent == SCTP_DATAGRAM_RESEND) {
2964 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
2965 #ifdef SCTP_AUDITING_ENABLED
2966 sctp_audit_log(0xB2,
2967 (stcb->asoc.sent_queue_retran_cnt & 0x000000ff));
2972 * All chunks NOT UNSENT fall through here and are marked
2973 * (leave PR-SCTP ones that are to skip alone though)
2975 if ((tp1->sent != SCTP_FORWARD_TSN_SKIP) &&
2976 (tp1->sent != SCTP_DATAGRAM_NR_ACKED)) {
2977 tp1->sent = SCTP_DATAGRAM_MARKED;
2979 if (tp1->rec.data.chunk_was_revoked) {
2980 /* deflate the cwnd */
2981 tp1->whoTo->cwnd -= tp1->book_size;
2982 tp1->rec.data.chunk_was_revoked = 0;
2984 /* NR Sack code here */
2986 (tp1->sent != SCTP_DATAGRAM_NR_ACKED)) {
2987 if (stcb->asoc.strmout[tp1->rec.data.stream_number].chunks_on_queues > 0) {
2988 stcb->asoc.strmout[tp1->rec.data.stream_number].chunks_on_queues--;
2991 panic("No chunks on the queues for sid %u.", tp1->rec.data.stream_number);
2994 tp1->sent = SCTP_DATAGRAM_NR_ACKED;
3000 sctp_free_bufspace(stcb, &stcb->asoc, tp1, 1);
3001 sctp_m_freem(tp1->data);
3008 } /* if (tp1->TSN_seq == theTSN) */
3009 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, theTSN)) {
3012 tp1 = TAILQ_NEXT(tp1, sctp_next);
3013 if ((tp1 == NULL) && (circled == 0)) {
3015 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue);
3017 } /* end while (tp1) */
3020 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue);
3022 /* In case the fragments were not in order we must reset */
3023 } /* end for (j = fragStart */
3025 return (wake_him); /* Return value only used for nr-sack */
3030 sctp_handle_segments(struct mbuf *m, int *offset, struct sctp_tcb *stcb, struct sctp_association *asoc,
3031 uint32_t last_tsn, uint32_t * biggest_tsn_acked,
3032 uint32_t * biggest_newly_acked_tsn, uint32_t * this_sack_lowest_newack,
3033 int num_seg, int num_nr_seg, int *rto_ok)
3035 struct sctp_gap_ack_block *frag, block;
3036 struct sctp_tmit_chunk *tp1;
3041 uint16_t frag_strt, frag_end, prev_frag_end;
3043 tp1 = TAILQ_FIRST(&asoc->sent_queue);
3047 for (i = 0; i < (num_seg + num_nr_seg); i++) {
3050 tp1 = TAILQ_FIRST(&asoc->sent_queue);
3052 frag = (struct sctp_gap_ack_block *)sctp_m_getptr(m, *offset,
3053 sizeof(struct sctp_gap_ack_block), (uint8_t *) & block);
3054 *offset += sizeof(block);
3056 return (chunk_freed);
3058 frag_strt = ntohs(frag->start);
3059 frag_end = ntohs(frag->end);
3061 if (frag_strt > frag_end) {
3062 /* This gap report is malformed, skip it. */
3065 if (frag_strt <= prev_frag_end) {
3066 /* This gap report is not in order, so restart. */
3067 tp1 = TAILQ_FIRST(&asoc->sent_queue);
3069 if (SCTP_TSN_GT((last_tsn + frag_end), *biggest_tsn_acked)) {
3070 *biggest_tsn_acked = last_tsn + frag_end;
3077 if (sctp_process_segment_range(stcb, &tp1, last_tsn, frag_strt, frag_end,
3078 non_revocable, &num_frs, biggest_newly_acked_tsn,
3079 this_sack_lowest_newack, rto_ok)) {
3082 prev_frag_end = frag_end;
3084 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
3086 sctp_log_fr(*biggest_tsn_acked,
3087 *biggest_newly_acked_tsn,
3088 last_tsn, SCTP_FR_LOG_BIGGEST_TSNS);
3090 return (chunk_freed);
3094 sctp_check_for_revoked(struct sctp_tcb *stcb,
3095 struct sctp_association *asoc, uint32_t cumack,
3096 uint32_t biggest_tsn_acked)
3098 struct sctp_tmit_chunk *tp1;
3100 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
3101 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, cumack)) {
3103 * ok this guy is either ACK or MARKED. If it is
3104 * ACKED it has been previously acked but not this
3105 * time i.e. revoked. If it is MARKED it was ACK'ed
3108 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, biggest_tsn_acked)) {
3111 if (tp1->sent == SCTP_DATAGRAM_ACKED) {
3112 /* it has been revoked */
3113 tp1->sent = SCTP_DATAGRAM_SENT;
3114 tp1->rec.data.chunk_was_revoked = 1;
3116 * We must add this stuff back in to assure
3117 * timers and such get started.
3119 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3120 sctp_misc_ints(SCTP_FLIGHT_LOG_UP_REVOKE,
3121 tp1->whoTo->flight_size,
3123 (uintptr_t) tp1->whoTo,
3124 tp1->rec.data.TSN_seq);
3126 sctp_flight_size_increase(tp1);
3127 sctp_total_flight_increase(stcb, tp1);
3129 * We inflate the cwnd to compensate for our
3130 * artificial inflation of the flight_size.
3132 tp1->whoTo->cwnd += tp1->book_size;
3133 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
3134 sctp_log_sack(asoc->last_acked_seq,
3136 tp1->rec.data.TSN_seq,
3139 SCTP_LOG_TSN_REVOKED);
3141 } else if (tp1->sent == SCTP_DATAGRAM_MARKED) {
3142 /* it has been re-acked in this SACK */
3143 tp1->sent = SCTP_DATAGRAM_ACKED;
3146 if (tp1->sent == SCTP_DATAGRAM_UNSENT)
3153 sctp_strike_gap_ack_chunks(struct sctp_tcb *stcb, struct sctp_association *asoc,
3154 uint32_t biggest_tsn_acked, uint32_t biggest_tsn_newly_acked, uint32_t this_sack_lowest_newack, int accum_moved)
3156 struct sctp_tmit_chunk *tp1;
3157 int strike_flag = 0;
3159 int tot_retrans = 0;
3160 uint32_t sending_seq;
3161 struct sctp_nets *net;
3162 int num_dests_sacked = 0;
3165 * select the sending_seq, this is either the next thing ready to be
3166 * sent but not transmitted, OR, the next seq we assign.
3168 tp1 = TAILQ_FIRST(&stcb->asoc.send_queue);
3170 sending_seq = asoc->sending_seq;
3172 sending_seq = tp1->rec.data.TSN_seq;
3175 /* CMT DAC algo: finding out if SACK is a mixed SACK */
3176 if ((asoc->sctp_cmt_on_off > 0) &&
3177 SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
3178 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
3179 if (net->saw_newack)
3183 if (stcb->asoc.peer_supports_prsctp) {
3184 (void)SCTP_GETTIME_TIMEVAL(&now);
3186 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
3188 if (tp1->no_fr_allowed) {
3189 /* this one had a timeout or something */
3192 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
3193 if (tp1->sent < SCTP_DATAGRAM_RESEND)
3194 sctp_log_fr(biggest_tsn_newly_acked,
3195 tp1->rec.data.TSN_seq,
3197 SCTP_FR_LOG_CHECK_STRIKE);
3199 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, biggest_tsn_acked) ||
3200 tp1->sent == SCTP_DATAGRAM_UNSENT) {
3204 if (stcb->asoc.peer_supports_prsctp) {
3205 if ((PR_SCTP_TTL_ENABLED(tp1->flags)) && tp1->sent < SCTP_DATAGRAM_ACKED) {
3206 /* Is it expired? */
3207 if (timevalcmp(&now, &tp1->rec.data.timetodrop, >)) {
3208 /* Yes so drop it */
3209 if (tp1->data != NULL) {
3210 (void)sctp_release_pr_sctp_chunk(stcb, tp1, 1,
3211 SCTP_SO_NOT_LOCKED);
3217 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, asoc->this_sack_highest_gap)) {
3218 /* we are beyond the tsn in the sack */
3221 if (tp1->sent >= SCTP_DATAGRAM_RESEND) {
3222 /* either a RESEND, ACKED, or MARKED */
3224 if (tp1->sent == SCTP_FORWARD_TSN_SKIP) {
3225 /* Continue strikin FWD-TSN chunks */
3226 tp1->rec.data.fwd_tsn_cnt++;
3231 * CMT : SFR algo (covers part of DAC and HTNA as well)
3233 if (tp1->whoTo && tp1->whoTo->saw_newack == 0) {
3235 * No new acks were receieved for data sent to this
3236 * dest. Therefore, according to the SFR algo for
3237 * CMT, no data sent to this dest can be marked for
3238 * FR using this SACK.
3241 } else if (tp1->whoTo && SCTP_TSN_GT(tp1->rec.data.TSN_seq,
3242 tp1->whoTo->this_sack_highest_newack)) {
3244 * CMT: New acks were receieved for data sent to
3245 * this dest. But no new acks were seen for data
3246 * sent after tp1. Therefore, according to the SFR
3247 * algo for CMT, tp1 cannot be marked for FR using
3248 * this SACK. This step covers part of the DAC algo
3249 * and the HTNA algo as well.
3254 * Here we check to see if we were have already done a FR
3255 * and if so we see if the biggest TSN we saw in the sack is
3256 * smaller than the recovery point. If so we don't strike
3257 * the tsn... otherwise we CAN strike the TSN.
3260 * @@@ JRI: Check for CMT if (accum_moved &&
3261 * asoc->fast_retran_loss_recovery && (sctp_cmt_on_off ==
3264 if (accum_moved && asoc->fast_retran_loss_recovery) {
3266 * Strike the TSN if in fast-recovery and cum-ack
3269 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
3270 sctp_log_fr(biggest_tsn_newly_acked,
3271 tp1->rec.data.TSN_seq,
3273 SCTP_FR_LOG_STRIKE_CHUNK);
3275 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3278 if ((asoc->sctp_cmt_on_off > 0) &&
3279 SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
3281 * CMT DAC algorithm: If SACK flag is set to
3282 * 0, then lowest_newack test will not pass
3283 * because it would have been set to the
3284 * cumack earlier. If not already to be
3285 * rtx'd, If not a mixed sack and if tp1 is
3286 * not between two sacked TSNs, then mark by
3287 * one more. NOTE that we are marking by one
3288 * additional time since the SACK DAC flag
3289 * indicates that two packets have been
3290 * received after this missing TSN.
3292 if ((tp1->sent < SCTP_DATAGRAM_RESEND) && (num_dests_sacked == 1) &&
3293 SCTP_TSN_GT(this_sack_lowest_newack, tp1->rec.data.TSN_seq)) {
3294 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
3295 sctp_log_fr(16 + num_dests_sacked,
3296 tp1->rec.data.TSN_seq,
3298 SCTP_FR_LOG_STRIKE_CHUNK);
3303 } else if ((tp1->rec.data.doing_fast_retransmit) &&
3304 (asoc->sctp_cmt_on_off == 0)) {
3306 * For those that have done a FR we must take
3307 * special consideration if we strike. I.e the
3308 * biggest_newly_acked must be higher than the
3309 * sending_seq at the time we did the FR.
3312 #ifdef SCTP_FR_TO_ALTERNATE
3314 * If FR's go to new networks, then we must only do
3315 * this for singly homed asoc's. However if the FR's
3316 * go to the same network (Armando's work) then its
3317 * ok to FR multiple times.
3325 if (SCTP_TSN_GE(biggest_tsn_newly_acked,
3326 tp1->rec.data.fast_retran_tsn)) {
3328 * Strike the TSN, since this ack is
3329 * beyond where things were when we
3332 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
3333 sctp_log_fr(biggest_tsn_newly_acked,
3334 tp1->rec.data.TSN_seq,
3336 SCTP_FR_LOG_STRIKE_CHUNK);
3338 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3342 if ((asoc->sctp_cmt_on_off > 0) &&
3343 SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
3345 * CMT DAC algorithm: If
3346 * SACK flag is set to 0,
3347 * then lowest_newack test
3348 * will not pass because it
3349 * would have been set to
3350 * the cumack earlier. If
3351 * not already to be rtx'd,
3352 * If not a mixed sack and
3353 * if tp1 is not between two
3354 * sacked TSNs, then mark by
3355 * one more. NOTE that we
3356 * are marking by one
3357 * additional time since the
3358 * SACK DAC flag indicates
3359 * that two packets have
3360 * been received after this
3363 if ((tp1->sent < SCTP_DATAGRAM_RESEND) &&
3364 (num_dests_sacked == 1) &&
3365 SCTP_TSN_GT(this_sack_lowest_newack,
3366 tp1->rec.data.TSN_seq)) {
3367 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
3368 sctp_log_fr(32 + num_dests_sacked,
3369 tp1->rec.data.TSN_seq,
3371 SCTP_FR_LOG_STRIKE_CHUNK);
3373 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3381 * JRI: TODO: remove code for HTNA algo. CMT's SFR
3384 } else if (SCTP_TSN_GT(tp1->rec.data.TSN_seq,
3385 biggest_tsn_newly_acked)) {
3387 * We don't strike these: This is the HTNA
3388 * algorithm i.e. we don't strike If our TSN is
3389 * larger than the Highest TSN Newly Acked.
3393 /* Strike the TSN */
3394 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
3395 sctp_log_fr(biggest_tsn_newly_acked,
3396 tp1->rec.data.TSN_seq,
3398 SCTP_FR_LOG_STRIKE_CHUNK);
3400 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3403 if ((asoc->sctp_cmt_on_off > 0) &&
3404 SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
3406 * CMT DAC algorithm: If SACK flag is set to
3407 * 0, then lowest_newack test will not pass
3408 * because it would have been set to the
3409 * cumack earlier. If not already to be
3410 * rtx'd, If not a mixed sack and if tp1 is
3411 * not between two sacked TSNs, then mark by
3412 * one more. NOTE that we are marking by one
3413 * additional time since the SACK DAC flag
3414 * indicates that two packets have been
3415 * received after this missing TSN.
3417 if ((tp1->sent < SCTP_DATAGRAM_RESEND) && (num_dests_sacked == 1) &&
3418 SCTP_TSN_GT(this_sack_lowest_newack, tp1->rec.data.TSN_seq)) {
3419 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
3420 sctp_log_fr(48 + num_dests_sacked,
3421 tp1->rec.data.TSN_seq,
3423 SCTP_FR_LOG_STRIKE_CHUNK);
3429 if (tp1->sent == SCTP_DATAGRAM_RESEND) {
3430 struct sctp_nets *alt;
3432 /* fix counts and things */
3433 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3434 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_RSND,
3435 (tp1->whoTo ? (tp1->whoTo->flight_size) : 0),
3437 (uintptr_t) tp1->whoTo,
3438 tp1->rec.data.TSN_seq);
3441 tp1->whoTo->net_ack++;
3442 sctp_flight_size_decrease(tp1);
3443 if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) {
3444 (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo,
3448 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
3449 sctp_log_rwnd(SCTP_INCREASE_PEER_RWND,
3450 asoc->peers_rwnd, tp1->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
3452 /* add back to the rwnd */
3453 asoc->peers_rwnd += (tp1->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
3455 /* remove from the total flight */
3456 sctp_total_flight_decrease(stcb, tp1);
3458 if ((stcb->asoc.peer_supports_prsctp) &&
3459 (PR_SCTP_RTX_ENABLED(tp1->flags))) {
3461 * Has it been retransmitted tv_sec times? -
3462 * we store the retran count there.
3464 if (tp1->snd_count > tp1->rec.data.timetodrop.tv_sec) {
3465 /* Yes, so drop it */
3466 if (tp1->data != NULL) {
3467 (void)sctp_release_pr_sctp_chunk(stcb, tp1, 1,
3468 SCTP_SO_NOT_LOCKED);
3470 /* Make sure to flag we had a FR */
3471 tp1->whoTo->net_ack++;
3476 * SCTP_PRINTF("OK, we are now ready to FR this
3479 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
3480 sctp_log_fr(tp1->rec.data.TSN_seq, tp1->snd_count,
3484 /* This is a subsequent FR */
3485 SCTP_STAT_INCR(sctps_sendmultfastretrans);
3487 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3488 if (asoc->sctp_cmt_on_off > 0) {
3490 * CMT: Using RTX_SSTHRESH policy for CMT.
3491 * If CMT is being used, then pick dest with
3492 * largest ssthresh for any retransmission.
3494 tp1->no_fr_allowed = 1;
3496 /* sa_ignore NO_NULL_CHK */
3497 if (asoc->sctp_cmt_pf > 0) {
3499 * JRS 5/18/07 - If CMT PF is on,
3500 * use the PF version of
3503 alt = sctp_find_alternate_net(stcb, alt, 2);
3506 * JRS 5/18/07 - If only CMT is on,
3507 * use the CMT version of
3510 /* sa_ignore NO_NULL_CHK */
3511 alt = sctp_find_alternate_net(stcb, alt, 1);
3517 * CUCv2: If a different dest is picked for
3518 * the retransmission, then new
3519 * (rtx-)pseudo_cumack needs to be tracked
3520 * for orig dest. Let CUCv2 track new (rtx-)
3521 * pseudo-cumack always.
3524 tp1->whoTo->find_pseudo_cumack = 1;
3525 tp1->whoTo->find_rtx_pseudo_cumack = 1;
3527 } else {/* CMT is OFF */
3529 #ifdef SCTP_FR_TO_ALTERNATE
3530 /* Can we find an alternate? */
3531 alt = sctp_find_alternate_net(stcb, tp1->whoTo, 0);
3534 * default behavior is to NOT retransmit
3535 * FR's to an alternate. Armando Caro's
3536 * paper details why.
3542 tp1->rec.data.doing_fast_retransmit = 1;
3544 /* mark the sending seq for possible subsequent FR's */
3546 * SCTP_PRINTF("Marking TSN for FR new value %x\n",
3547 * (uint32_t)tpi->rec.data.TSN_seq);
3549 if (TAILQ_EMPTY(&asoc->send_queue)) {
3551 * If the queue of send is empty then its
3552 * the next sequence number that will be
3553 * assigned so we subtract one from this to
3554 * get the one we last sent.
3556 tp1->rec.data.fast_retran_tsn = sending_seq;
3559 * If there are chunks on the send queue
3560 * (unsent data that has made it from the
3561 * stream queues but not out the door, we
3562 * take the first one (which will have the
3563 * lowest TSN) and subtract one to get the
3566 struct sctp_tmit_chunk *ttt;
3568 ttt = TAILQ_FIRST(&asoc->send_queue);
3569 tp1->rec.data.fast_retran_tsn =
3570 ttt->rec.data.TSN_seq;
3575 * this guy had a RTO calculation pending on
3578 if ((tp1->whoTo != NULL) &&
3579 (tp1->whoTo->rto_needed == 0)) {
3580 tp1->whoTo->rto_needed = 1;
3584 if (alt != tp1->whoTo) {
3585 /* yes, there is an alternate. */
3586 sctp_free_remote_addr(tp1->whoTo);
3587 /* sa_ignore FREED_MEMORY */
3589 atomic_add_int(&alt->ref_count, 1);
3595 struct sctp_tmit_chunk *
3596 sctp_try_advance_peer_ack_point(struct sctp_tcb *stcb,
3597 struct sctp_association *asoc)
3599 struct sctp_tmit_chunk *tp1, *tp2, *a_adv = NULL;
3603 if (asoc->peer_supports_prsctp == 0) {
3606 TAILQ_FOREACH_SAFE(tp1, &asoc->sent_queue, sctp_next, tp2) {
3607 if (tp1->sent != SCTP_FORWARD_TSN_SKIP &&
3608 tp1->sent != SCTP_DATAGRAM_RESEND &&
3609 tp1->sent != SCTP_DATAGRAM_NR_ACKED) {
3610 /* no chance to advance, out of here */
3613 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
3614 if ((tp1->sent == SCTP_FORWARD_TSN_SKIP) ||
3615 (tp1->sent == SCTP_DATAGRAM_NR_ACKED)) {
3616 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
3617 asoc->advanced_peer_ack_point,
3618 tp1->rec.data.TSN_seq, 0, 0);
3621 if (!PR_SCTP_ENABLED(tp1->flags)) {
3623 * We can't fwd-tsn past any that are reliable aka
3624 * retransmitted until the asoc fails.
3629 (void)SCTP_GETTIME_TIMEVAL(&now);
3633 * now we got a chunk which is marked for another
3634 * retransmission to a PR-stream but has run out its chances
3635 * already maybe OR has been marked to skip now. Can we skip
3636 * it if its a resend?
3638 if (tp1->sent == SCTP_DATAGRAM_RESEND &&
3639 (PR_SCTP_TTL_ENABLED(tp1->flags))) {
3641 * Now is this one marked for resend and its time is
3644 if (timevalcmp(&now, &tp1->rec.data.timetodrop, >)) {
3645 /* Yes so drop it */
3647 (void)sctp_release_pr_sctp_chunk(stcb, tp1,
3648 1, SCTP_SO_NOT_LOCKED);
3652 * No, we are done when hit one for resend
3653 * whos time as not expired.
3659 * Ok now if this chunk is marked to drop it we can clean up
3660 * the chunk, advance our peer ack point and we can check
3663 if ((tp1->sent == SCTP_FORWARD_TSN_SKIP) ||
3664 (tp1->sent == SCTP_DATAGRAM_NR_ACKED)) {
3665 /* advance PeerAckPoint goes forward */
3666 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, asoc->advanced_peer_ack_point)) {
3667 asoc->advanced_peer_ack_point = tp1->rec.data.TSN_seq;
3669 } else if (tp1->rec.data.TSN_seq == asoc->advanced_peer_ack_point) {
3670 /* No update but we do save the chk */
3675 * If it is still in RESEND we can advance no
3685 sctp_fs_audit(struct sctp_association *asoc)
3687 struct sctp_tmit_chunk *chk;
3688 int inflight = 0, resend = 0, inbetween = 0, acked = 0, above = 0;
3689 int entry_flight, entry_cnt, ret;
3691 entry_flight = asoc->total_flight;
3692 entry_cnt = asoc->total_flight_count;
3695 if (asoc->pr_sctp_cnt >= asoc->sent_queue_cnt)
3698 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
3699 if (chk->sent < SCTP_DATAGRAM_RESEND) {
3700 SCTP_PRINTF("Chk TSN:%u size:%d inflight cnt:%d\n",
3701 chk->rec.data.TSN_seq,
3705 } else if (chk->sent == SCTP_DATAGRAM_RESEND) {
3707 } else if (chk->sent < SCTP_DATAGRAM_ACKED) {
3709 } else if (chk->sent > SCTP_DATAGRAM_ACKED) {
3716 if ((inflight > 0) || (inbetween > 0)) {
3718 panic("Flight size-express incorrect? \n");
3720 SCTP_PRINTF("asoc->total_flight:%d cnt:%d\n",
3721 entry_flight, entry_cnt);
3723 SCTP_PRINTF("Flight size-express incorrect F:%d I:%d R:%d Ab:%d ACK:%d\n",
3724 inflight, inbetween, resend, above, acked);
3733 sctp_window_probe_recovery(struct sctp_tcb *stcb,
3734 struct sctp_association *asoc,
3735 struct sctp_tmit_chunk *tp1)
3737 tp1->window_probe = 0;
3738 if ((tp1->sent >= SCTP_DATAGRAM_ACKED) || (tp1->data == NULL)) {
3739 /* TSN's skipped we do NOT move back. */
3740 sctp_misc_ints(SCTP_FLIGHT_LOG_DWN_WP_FWD,
3741 tp1->whoTo->flight_size,
3743 (uintptr_t) tp1->whoTo,
3744 tp1->rec.data.TSN_seq);
3747 /* First setup this by shrinking flight */
3748 if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) {
3749 (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo,
3752 sctp_flight_size_decrease(tp1);
3753 sctp_total_flight_decrease(stcb, tp1);
3754 /* Now mark for resend */
3755 tp1->sent = SCTP_DATAGRAM_RESEND;
3756 sctp_ucount_incr(asoc->sent_queue_retran_cnt);
3758 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3759 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_WP,
3760 tp1->whoTo->flight_size,
3762 (uintptr_t) tp1->whoTo,
3763 tp1->rec.data.TSN_seq);
3768 sctp_express_handle_sack(struct sctp_tcb *stcb, uint32_t cumack,
3769 uint32_t rwnd, int *abort_now, int ecne_seen)
3771 struct sctp_nets *net;
3772 struct sctp_association *asoc;
3773 struct sctp_tmit_chunk *tp1, *tp2;
3775 int win_probe_recovery = 0;
3776 int win_probe_recovered = 0;
3777 int j, done_once = 0;
3780 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_SACK_ARRIVALS_ENABLE) {
3781 sctp_misc_ints(SCTP_SACK_LOG_EXPRESS, cumack,
3782 rwnd, stcb->asoc.last_acked_seq, stcb->asoc.peers_rwnd);
3784 SCTP_TCB_LOCK_ASSERT(stcb);
3785 #ifdef SCTP_ASOCLOG_OF_TSNS
3786 stcb->asoc.cumack_log[stcb->asoc.cumack_log_at] = cumack;
3787 stcb->asoc.cumack_log_at++;
3788 if (stcb->asoc.cumack_log_at > SCTP_TSN_LOG_SIZE) {
3789 stcb->asoc.cumack_log_at = 0;
3793 old_rwnd = asoc->peers_rwnd;
3794 if (SCTP_TSN_GT(asoc->last_acked_seq, cumack)) {
3797 } else if (asoc->last_acked_seq == cumack) {
3798 /* Window update sack */
3799 asoc->peers_rwnd = sctp_sbspace_sub(rwnd,
3800 (uint32_t) (asoc->total_flight + (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh))));
3801 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
3802 /* SWS sender side engages */
3803 asoc->peers_rwnd = 0;
3805 if (asoc->peers_rwnd > old_rwnd) {
3810 /* First setup for CC stuff */
3811 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
3812 if (SCTP_TSN_GT(cumack, net->cwr_window_tsn)) {
3813 /* Drag along the window_tsn for cwr's */
3814 net->cwr_window_tsn = cumack;
3816 net->prev_cwnd = net->cwnd;
3821 * CMT: Reset CUC and Fast recovery algo variables before
3824 net->new_pseudo_cumack = 0;
3825 net->will_exit_fast_recovery = 0;
3826 if (stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack) {
3827 (*stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack) (stcb, net);
3830 if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) {
3833 if (!TAILQ_EMPTY(&asoc->sent_queue)) {
3834 tp1 = TAILQ_LAST(&asoc->sent_queue,
3835 sctpchunk_listhead);
3836 send_s = tp1->rec.data.TSN_seq + 1;
3838 send_s = asoc->sending_seq;
3840 if (SCTP_TSN_GE(cumack, send_s)) {
3846 panic("Impossible sack 1");
3851 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)),
3852 0, M_DONTWAIT, 1, MT_DATA);
3854 struct sctp_paramhdr *ph;
3857 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
3859 ph = mtod(oper, struct sctp_paramhdr *);
3860 ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
3861 ph->param_length = htons(SCTP_BUF_LEN(oper));
3862 ippp = (uint32_t *) (ph + 1);
3863 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_25);
3865 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_25;
3866 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED);
3871 asoc->this_sack_highest_gap = cumack;
3872 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
3873 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
3874 stcb->asoc.overall_error_count,
3876 SCTP_FROM_SCTP_INDATA,
3879 stcb->asoc.overall_error_count = 0;
3880 if (SCTP_TSN_GT(cumack, asoc->last_acked_seq)) {
3881 /* process the new consecutive TSN first */
3882 TAILQ_FOREACH_SAFE(tp1, &asoc->sent_queue, sctp_next, tp2) {
3883 if (SCTP_TSN_GE(cumack, tp1->rec.data.TSN_seq)) {
3884 if (tp1->sent == SCTP_DATAGRAM_UNSENT) {
3885 SCTP_PRINTF("Warning, an unsent is now acked?\n");
3887 if (tp1->sent < SCTP_DATAGRAM_ACKED) {
3889 * If it is less than ACKED, it is
3890 * now no-longer in flight. Higher
3891 * values may occur during marking
3893 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3894 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3895 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_CA,
3896 tp1->whoTo->flight_size,
3898 (uintptr_t) tp1->whoTo,
3899 tp1->rec.data.TSN_seq);
3901 sctp_flight_size_decrease(tp1);
3902 if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) {
3903 (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo,
3906 /* sa_ignore NO_NULL_CHK */
3907 sctp_total_flight_decrease(stcb, tp1);
3909 tp1->whoTo->net_ack += tp1->send_size;
3910 if (tp1->snd_count < 2) {
3912 * True non-retransmited
3915 tp1->whoTo->net_ack2 +=
3918 /* update RTO too? */
3927 sctp_calculate_rto(stcb,
3929 &tp1->sent_rcv_time,
3930 sctp_align_safe_nocopy,
3931 SCTP_RTT_FROM_DATA);
3934 if (tp1->whoTo->rto_needed == 0) {
3935 tp1->whoTo->rto_needed = 1;
3941 * CMT: CUCv2 algorithm. From the
3942 * cumack'd TSNs, for each TSN being
3943 * acked for the first time, set the
3944 * following variables for the
3945 * corresp destination.
3946 * new_pseudo_cumack will trigger a
3948 * find_(rtx_)pseudo_cumack will
3949 * trigger search for the next
3950 * expected (rtx-)pseudo-cumack.
3952 tp1->whoTo->new_pseudo_cumack = 1;
3953 tp1->whoTo->find_pseudo_cumack = 1;
3954 tp1->whoTo->find_rtx_pseudo_cumack = 1;
3956 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
3957 /* sa_ignore NO_NULL_CHK */
3958 sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK);
3961 if (tp1->sent == SCTP_DATAGRAM_RESEND) {
3962 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
3964 if (tp1->rec.data.chunk_was_revoked) {
3965 /* deflate the cwnd */
3966 tp1->whoTo->cwnd -= tp1->book_size;
3967 tp1->rec.data.chunk_was_revoked = 0;
3969 if (tp1->sent != SCTP_DATAGRAM_NR_ACKED) {
3970 if (asoc->strmout[tp1->rec.data.stream_number].chunks_on_queues > 0) {
3971 asoc->strmout[tp1->rec.data.stream_number].chunks_on_queues--;
3974 panic("No chunks on the queues for sid %u.", tp1->rec.data.stream_number);
3978 TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next);
3980 /* sa_ignore NO_NULL_CHK */
3981 sctp_free_bufspace(stcb, asoc, tp1, 1);
3982 sctp_m_freem(tp1->data);
3985 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
3986 sctp_log_sack(asoc->last_acked_seq,
3988 tp1->rec.data.TSN_seq,
3991 SCTP_LOG_FREE_SENT);
3993 asoc->sent_queue_cnt--;
3994 sctp_free_a_chunk(stcb, tp1, SCTP_SO_NOT_LOCKED);
4001 /* sa_ignore NO_NULL_CHK */
4002 if (stcb->sctp_socket) {
4003 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4007 SOCKBUF_LOCK(&stcb->sctp_socket->so_snd);
4008 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) {
4009 /* sa_ignore NO_NULL_CHK */
4010 sctp_wakeup_log(stcb, 1, SCTP_WAKESND_FROM_SACK);
4012 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4013 so = SCTP_INP_SO(stcb->sctp_ep);
4014 atomic_add_int(&stcb->asoc.refcnt, 1);
4015 SCTP_TCB_UNLOCK(stcb);
4016 SCTP_SOCKET_LOCK(so, 1);
4017 SCTP_TCB_LOCK(stcb);
4018 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4019 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
4020 /* assoc was freed while we were unlocked */
4021 SCTP_SOCKET_UNLOCK(so, 1);
4025 sctp_sowwakeup_locked(stcb->sctp_ep, stcb->sctp_socket);
4026 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4027 SCTP_SOCKET_UNLOCK(so, 1);
4030 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) {
4031 sctp_wakeup_log(stcb, 1, SCTP_NOWAKE_FROM_SACK);
4035 /* JRS - Use the congestion control given in the CC module */
4036 if ((asoc->last_acked_seq != cumack) && (ecne_seen == 0)) {
4037 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4038 if (net->net_ack2 > 0) {
4040 * Karn's rule applies to clearing error
4041 * count, this is optional.
4043 net->error_count = 0;
4044 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
4045 /* addr came good */
4046 net->dest_state |= SCTP_ADDR_REACHABLE;
4047 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
4048 0, (void *)net, SCTP_SO_NOT_LOCKED);
4050 if (net == stcb->asoc.primary_destination) {
4051 if (stcb->asoc.alternate) {
4053 * release the alternate,
4056 sctp_free_remote_addr(stcb->asoc.alternate);
4057 stcb->asoc.alternate = NULL;
4060 if (net->dest_state & SCTP_ADDR_PF) {
4061 net->dest_state &= ~SCTP_ADDR_PF;
4062 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
4063 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
4064 asoc->cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
4065 /* Done with this net */
4068 /* restore any doubled timers */
4069 net->RTO = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv;
4070 if (net->RTO < stcb->asoc.minrto) {
4071 net->RTO = stcb->asoc.minrto;
4073 if (net->RTO > stcb->asoc.maxrto) {
4074 net->RTO = stcb->asoc.maxrto;
4078 asoc->cc_functions.sctp_cwnd_update_after_sack(stcb, asoc, 1, 0, 0);
4080 asoc->last_acked_seq = cumack;
4082 if (TAILQ_EMPTY(&asoc->sent_queue)) {
4083 /* nothing left in-flight */
4084 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4085 net->flight_size = 0;
4086 net->partial_bytes_acked = 0;
4088 asoc->total_flight = 0;
4089 asoc->total_flight_count = 0;
4092 asoc->peers_rwnd = sctp_sbspace_sub(rwnd,
4093 (uint32_t) (asoc->total_flight + (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh))));
4094 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4095 /* SWS sender side engages */
4096 asoc->peers_rwnd = 0;
4098 if (asoc->peers_rwnd > old_rwnd) {
4099 win_probe_recovery = 1;
4101 /* Now assure a timer where data is queued at */
4104 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4107 if (win_probe_recovery && (net->window_probe)) {
4108 win_probe_recovered = 1;
4110 * Find first chunk that was used with window probe
4111 * and clear the sent
4113 /* sa_ignore FREED_MEMORY */
4114 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
4115 if (tp1->window_probe) {
4116 /* move back to data send queue */
4117 sctp_window_probe_recovery(stcb, asoc, tp1);
4122 if (net->RTO == 0) {
4123 to_ticks = MSEC_TO_TICKS(stcb->asoc.initial_rto);
4125 to_ticks = MSEC_TO_TICKS(net->RTO);
4127 if (net->flight_size) {
4129 (void)SCTP_OS_TIMER_START(&net->rxt_timer.timer, to_ticks,
4130 sctp_timeout_handler, &net->rxt_timer);
4131 if (net->window_probe) {
4132 net->window_probe = 0;
4135 if (net->window_probe) {
4137 * In window probes we must assure a timer
4138 * is still running there
4140 net->window_probe = 0;
4141 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4142 SCTP_OS_TIMER_START(&net->rxt_timer.timer, to_ticks,
4143 sctp_timeout_handler, &net->rxt_timer);
4145 } else if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4146 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
4148 SCTP_FROM_SCTP_INDATA + SCTP_LOC_22);
4153 (!TAILQ_EMPTY(&asoc->sent_queue)) &&
4154 (asoc->sent_queue_retran_cnt == 0) &&
4155 (win_probe_recovered == 0) &&
4158 * huh, this should not happen unless all packets are
4159 * PR-SCTP and marked to skip of course.
4161 if (sctp_fs_audit(asoc)) {
4162 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4163 net->flight_size = 0;
4165 asoc->total_flight = 0;
4166 asoc->total_flight_count = 0;
4167 asoc->sent_queue_retran_cnt = 0;
4168 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
4169 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
4170 sctp_flight_size_increase(tp1);
4171 sctp_total_flight_increase(stcb, tp1);
4172 } else if (tp1->sent == SCTP_DATAGRAM_RESEND) {
4173 sctp_ucount_incr(asoc->sent_queue_retran_cnt);
4180 /**********************************/
4181 /* Now what about shutdown issues */
4182 /**********************************/
4183 if (TAILQ_EMPTY(&asoc->send_queue) && TAILQ_EMPTY(&asoc->sent_queue)) {
4184 /* nothing left on sendqueue.. consider done */
4186 if ((asoc->stream_queue_cnt == 1) &&
4187 ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
4188 (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED)) &&
4189 (asoc->locked_on_sending)
4191 struct sctp_stream_queue_pending *sp;
4194 * I may be in a state where we got all across.. but
4195 * cannot write more due to a shutdown... we abort
4196 * since the user did not indicate EOR in this case.
4197 * The sp will be cleaned during free of the asoc.
4199 sp = TAILQ_LAST(&((asoc->locked_on_sending)->outqueue),
4201 if ((sp) && (sp->length == 0)) {
4202 /* Let cleanup code purge it */
4203 if (sp->msg_is_complete) {
4204 asoc->stream_queue_cnt--;
4206 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
4207 asoc->locked_on_sending = NULL;
4208 asoc->stream_queue_cnt--;
4212 if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) &&
4213 (asoc->stream_queue_cnt == 0)) {
4214 if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) {
4215 /* Need to abort here */
4221 oper = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
4222 0, M_DONTWAIT, 1, MT_DATA);
4224 struct sctp_paramhdr *ph;
4226 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr);
4227 ph = mtod(oper, struct sctp_paramhdr *);
4228 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
4229 ph->param_length = htons(SCTP_BUF_LEN(oper));
4231 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_24;
4232 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED);
4234 struct sctp_nets *netp;
4236 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
4237 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
4238 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
4240 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
4241 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
4242 sctp_stop_timers_for_shutdown(stcb);
4243 if (asoc->alternate) {
4244 netp = asoc->alternate;
4246 netp = asoc->primary_destination;
4248 sctp_send_shutdown(stcb, netp);
4249 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
4250 stcb->sctp_ep, stcb, netp);
4251 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
4252 stcb->sctp_ep, stcb, netp);
4254 } else if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) &&
4255 (asoc->stream_queue_cnt == 0)) {
4256 struct sctp_nets *netp;
4258 if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) {
4261 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
4262 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
4263 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
4264 sctp_stop_timers_for_shutdown(stcb);
4265 if (asoc->alternate) {
4266 netp = asoc->alternate;
4268 netp = asoc->primary_destination;
4270 sctp_send_shutdown_ack(stcb, netp);
4271 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
4272 stcb->sctp_ep, stcb, netp);
4275 /*********************************************/
4276 /* Here we perform PR-SCTP procedures */
4278 /*********************************************/
4279 /* C1. update advancedPeerAckPoint */
4280 if (SCTP_TSN_GT(cumack, asoc->advanced_peer_ack_point)) {
4281 asoc->advanced_peer_ack_point = cumack;
4283 /* PR-Sctp issues need to be addressed too */
4284 if ((asoc->peer_supports_prsctp) && (asoc->pr_sctp_cnt > 0)) {
4285 struct sctp_tmit_chunk *lchk;
4286 uint32_t old_adv_peer_ack_point;
4288 old_adv_peer_ack_point = asoc->advanced_peer_ack_point;
4289 lchk = sctp_try_advance_peer_ack_point(stcb, asoc);
4290 /* C3. See if we need to send a Fwd-TSN */
4291 if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, cumack)) {
4293 * ISSUE with ECN, see FWD-TSN processing.
4295 if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, old_adv_peer_ack_point)) {
4296 send_forward_tsn(stcb, asoc);
4298 /* try to FR fwd-tsn's that get lost too */
4299 if (lchk->rec.data.fwd_tsn_cnt >= 3) {
4300 send_forward_tsn(stcb, asoc);
4305 /* Assure a timer is up */
4306 sctp_timer_start(SCTP_TIMER_TYPE_SEND,
4307 stcb->sctp_ep, stcb, lchk->whoTo);
4310 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_RWND_LOGGING_ENABLE) {
4311 sctp_misc_ints(SCTP_SACK_RWND_UPDATE,
4313 stcb->asoc.peers_rwnd,
4314 stcb->asoc.total_flight,
4315 stcb->asoc.total_output_queue_size);
4320 sctp_handle_sack(struct mbuf *m, int offset_seg, int offset_dup,
4321 struct sctp_tcb *stcb,
4322 uint16_t num_seg, uint16_t num_nr_seg, uint16_t num_dup,
4323 int *abort_now, uint8_t flags,
4324 uint32_t cum_ack, uint32_t rwnd, int ecne_seen)
4326 struct sctp_association *asoc;
4327 struct sctp_tmit_chunk *tp1, *tp2;
4328 uint32_t last_tsn, biggest_tsn_acked, biggest_tsn_newly_acked, this_sack_lowest_newack;
4329 uint16_t wake_him = 0;
4330 uint32_t send_s = 0;
4332 int accum_moved = 0;
4333 int will_exit_fast_recovery = 0;
4334 uint32_t a_rwnd, old_rwnd;
4335 int win_probe_recovery = 0;
4336 int win_probe_recovered = 0;
4337 struct sctp_nets *net = NULL;
4340 uint8_t reneged_all = 0;
4341 uint8_t cmt_dac_flag;
4344 * we take any chance we can to service our queues since we cannot
4345 * get awoken when the socket is read from :<
4348 * Now perform the actual SACK handling: 1) Verify that it is not an
4349 * old sack, if so discard. 2) If there is nothing left in the send
4350 * queue (cum-ack is equal to last acked) then you have a duplicate
4351 * too, update any rwnd change and verify no timers are running.
4352 * then return. 3) Process any new consequtive data i.e. cum-ack
4353 * moved process these first and note that it moved. 4) Process any
4354 * sack blocks. 5) Drop any acked from the queue. 6) Check for any
4355 * revoked blocks and mark. 7) Update the cwnd. 8) Nothing left,
4356 * sync up flightsizes and things, stop all timers and also check
4357 * for shutdown_pending state. If so then go ahead and send off the
4358 * shutdown. If in shutdown recv, send off the shutdown-ack and
4359 * start that timer, Ret. 9) Strike any non-acked things and do FR
4360 * procedure if needed being sure to set the FR flag. 10) Do pr-sctp
4361 * procedures. 11) Apply any FR penalties. 12) Assure we will SACK
4362 * if in shutdown_recv state.
4364 SCTP_TCB_LOCK_ASSERT(stcb);
4366 this_sack_lowest_newack = 0;
4367 SCTP_STAT_INCR(sctps_slowpath_sack);
4369 cmt_dac_flag = flags & SCTP_SACK_CMT_DAC;
4370 #ifdef SCTP_ASOCLOG_OF_TSNS
4371 stcb->asoc.cumack_log[stcb->asoc.cumack_log_at] = cum_ack;
4372 stcb->asoc.cumack_log_at++;
4373 if (stcb->asoc.cumack_log_at > SCTP_TSN_LOG_SIZE) {
4374 stcb->asoc.cumack_log_at = 0;
4379 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_SACK_ARRIVALS_ENABLE) {
4380 sctp_misc_ints(SCTP_SACK_LOG_NORMAL, cum_ack,
4381 rwnd, stcb->asoc.last_acked_seq, stcb->asoc.peers_rwnd);
4383 old_rwnd = stcb->asoc.peers_rwnd;
4384 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4385 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4386 stcb->asoc.overall_error_count,
4388 SCTP_FROM_SCTP_INDATA,
4391 stcb->asoc.overall_error_count = 0;
4393 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
4394 sctp_log_sack(asoc->last_acked_seq,
4401 if ((num_dup) && (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE)) {
4403 uint32_t *dupdata, dblock;
4405 for (i = 0; i < num_dup; i++) {
4406 dupdata = (uint32_t *) sctp_m_getptr(m, offset_dup + i * sizeof(uint32_t),
4407 sizeof(uint32_t), (uint8_t *) & dblock);
4408 if (dupdata == NULL) {
4411 sctp_log_fr(*dupdata, 0, 0, SCTP_FR_DUPED);
4414 if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) {
4416 if (!TAILQ_EMPTY(&asoc->sent_queue)) {
4417 tp1 = TAILQ_LAST(&asoc->sent_queue,
4418 sctpchunk_listhead);
4419 send_s = tp1->rec.data.TSN_seq + 1;
4422 send_s = asoc->sending_seq;
4424 if (SCTP_TSN_GE(cum_ack, send_s)) {
4428 * no way, we have not even sent this TSN out yet.
4429 * Peer is hopelessly messed up with us.
4431 SCTP_PRINTF("NEW cum_ack:%x send_s:%x is smaller or equal\n",
4434 SCTP_PRINTF("Got send_s from tsn:%x + 1 of tp1:%p\n",
4435 tp1->rec.data.TSN_seq, (void *)tp1);
4440 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)),
4441 0, M_DONTWAIT, 1, MT_DATA);
4443 struct sctp_paramhdr *ph;
4446 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
4448 ph = mtod(oper, struct sctp_paramhdr *);
4449 ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
4450 ph->param_length = htons(SCTP_BUF_LEN(oper));
4451 ippp = (uint32_t *) (ph + 1);
4452 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_25);
4454 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_25;
4455 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED);
4459 /**********************/
4460 /* 1) check the range */
4461 /**********************/
4462 if (SCTP_TSN_GT(asoc->last_acked_seq, last_tsn)) {
4463 /* acking something behind */
4466 /* update the Rwnd of the peer */
4467 if (TAILQ_EMPTY(&asoc->sent_queue) &&
4468 TAILQ_EMPTY(&asoc->send_queue) &&
4469 (asoc->stream_queue_cnt == 0)) {
4470 /* nothing left on send/sent and strmq */
4471 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
4472 sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK,
4473 asoc->peers_rwnd, 0, 0, a_rwnd);
4475 asoc->peers_rwnd = a_rwnd;
4476 if (asoc->sent_queue_retran_cnt) {
4477 asoc->sent_queue_retran_cnt = 0;
4479 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4480 /* SWS sender side engages */
4481 asoc->peers_rwnd = 0;
4483 /* stop any timers */
4484 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4485 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
4486 stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_26);
4487 net->partial_bytes_acked = 0;
4488 net->flight_size = 0;
4490 asoc->total_flight = 0;
4491 asoc->total_flight_count = 0;
4495 * We init netAckSz and netAckSz2 to 0. These are used to track 2
4496 * things. The total byte count acked is tracked in netAckSz AND
4497 * netAck2 is used to track the total bytes acked that are un-
4498 * amibguious and were never retransmitted. We track these on a per
4499 * destination address basis.
4501 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4502 if (SCTP_TSN_GT(cum_ack, net->cwr_window_tsn)) {
4503 /* Drag along the window_tsn for cwr's */
4504 net->cwr_window_tsn = cum_ack;
4506 net->prev_cwnd = net->cwnd;
4511 * CMT: Reset CUC and Fast recovery algo variables before
4514 net->new_pseudo_cumack = 0;
4515 net->will_exit_fast_recovery = 0;
4516 if (stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack) {
4517 (*stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack) (stcb, net);
4520 /* process the new consecutive TSN first */
4521 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
4522 if (SCTP_TSN_GE(last_tsn, tp1->rec.data.TSN_seq)) {
4523 if (tp1->sent != SCTP_DATAGRAM_UNSENT) {
4525 if (tp1->sent < SCTP_DATAGRAM_ACKED) {
4527 * If it is less than ACKED, it is
4528 * now no-longer in flight. Higher
4529 * values may occur during marking
4531 if ((tp1->whoTo->dest_state &
4532 SCTP_ADDR_UNCONFIRMED) &&
4533 (tp1->snd_count < 2)) {
4535 * If there was no retran
4536 * and the address is
4537 * un-confirmed and we sent
4539 * sacked.. its confirmed,
4542 tp1->whoTo->dest_state &=
4543 ~SCTP_ADDR_UNCONFIRMED;
4545 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
4546 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
4547 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_CA,
4548 tp1->whoTo->flight_size,
4550 (uintptr_t) tp1->whoTo,
4551 tp1->rec.data.TSN_seq);
4553 sctp_flight_size_decrease(tp1);
4554 sctp_total_flight_decrease(stcb, tp1);
4555 if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) {
4556 (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo,
4560 tp1->whoTo->net_ack += tp1->send_size;
4562 /* CMT SFR and DAC algos */
4563 this_sack_lowest_newack = tp1->rec.data.TSN_seq;
4564 tp1->whoTo->saw_newack = 1;
4566 if (tp1->snd_count < 2) {
4568 * True non-retransmited
4571 tp1->whoTo->net_ack2 +=
4574 /* update RTO too? */
4578 sctp_calculate_rto(stcb,
4580 &tp1->sent_rcv_time,
4581 sctp_align_safe_nocopy,
4582 SCTP_RTT_FROM_DATA);
4585 if (tp1->whoTo->rto_needed == 0) {
4586 tp1->whoTo->rto_needed = 1;
4592 * CMT: CUCv2 algorithm. From the
4593 * cumack'd TSNs, for each TSN being
4594 * acked for the first time, set the
4595 * following variables for the
4596 * corresp destination.
4597 * new_pseudo_cumack will trigger a
4599 * find_(rtx_)pseudo_cumack will
4600 * trigger search for the next
4601 * expected (rtx-)pseudo-cumack.
4603 tp1->whoTo->new_pseudo_cumack = 1;
4604 tp1->whoTo->find_pseudo_cumack = 1;
4605 tp1->whoTo->find_rtx_pseudo_cumack = 1;
4608 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
4609 sctp_log_sack(asoc->last_acked_seq,
4611 tp1->rec.data.TSN_seq,
4614 SCTP_LOG_TSN_ACKED);
4616 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
4617 sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK);
4620 if (tp1->sent == SCTP_DATAGRAM_RESEND) {
4621 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
4622 #ifdef SCTP_AUDITING_ENABLED
4623 sctp_audit_log(0xB3,
4624 (asoc->sent_queue_retran_cnt & 0x000000ff));
4627 if (tp1->rec.data.chunk_was_revoked) {
4628 /* deflate the cwnd */
4629 tp1->whoTo->cwnd -= tp1->book_size;
4630 tp1->rec.data.chunk_was_revoked = 0;
4632 if (tp1->sent != SCTP_DATAGRAM_NR_ACKED) {
4633 tp1->sent = SCTP_DATAGRAM_ACKED;
4640 biggest_tsn_newly_acked = biggest_tsn_acked = last_tsn;
4641 /* always set this up to cum-ack */
4642 asoc->this_sack_highest_gap = last_tsn;
4644 if ((num_seg > 0) || (num_nr_seg > 0)) {
4647 * CMT: SFR algo (and HTNA) - this_sack_highest_newack has
4648 * to be greater than the cumack. Also reset saw_newack to 0
4651 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4652 net->saw_newack = 0;
4653 net->this_sack_highest_newack = last_tsn;
4657 * thisSackHighestGap will increase while handling NEW
4658 * segments this_sack_highest_newack will increase while
4659 * handling NEWLY ACKED chunks. this_sack_lowest_newack is
4660 * used for CMT DAC algo. saw_newack will also change.
4662 if (sctp_handle_segments(m, &offset_seg, stcb, asoc, last_tsn, &biggest_tsn_acked,
4663 &biggest_tsn_newly_acked, &this_sack_lowest_newack,
4664 num_seg, num_nr_seg, &rto_ok)) {
4667 if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) {
4669 * validate the biggest_tsn_acked in the gap acks if
4670 * strict adherence is wanted.
4672 if (SCTP_TSN_GE(biggest_tsn_acked, send_s)) {
4674 * peer is either confused or we are under
4675 * attack. We must abort.
4677 SCTP_PRINTF("Hopeless peer! biggest_tsn_acked:%x largest seq:%x\n",
4678 biggest_tsn_acked, send_s);
4683 /*******************************************/
4684 /* cancel ALL T3-send timer if accum moved */
4685 /*******************************************/
4686 if (asoc->sctp_cmt_on_off > 0) {
4687 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4688 if (net->new_pseudo_cumack)
4689 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
4691 SCTP_FROM_SCTP_INDATA + SCTP_LOC_27);
4696 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4697 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
4698 stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_28);
4702 /********************************************/
4703 /* drop the acked chunks from the sentqueue */
4704 /********************************************/
4705 asoc->last_acked_seq = cum_ack;
4707 TAILQ_FOREACH_SAFE(tp1, &asoc->sent_queue, sctp_next, tp2) {
4708 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, cum_ack)) {
4711 if (tp1->sent != SCTP_DATAGRAM_NR_ACKED) {
4712 if (asoc->strmout[tp1->rec.data.stream_number].chunks_on_queues > 0) {
4713 asoc->strmout[tp1->rec.data.stream_number].chunks_on_queues--;
4716 panic("No chunks on the queues for sid %u.", tp1->rec.data.stream_number);
4720 TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next);
4721 if (tp1->pr_sctp_on) {
4722 if (asoc->pr_sctp_cnt != 0)
4723 asoc->pr_sctp_cnt--;
4725 asoc->sent_queue_cnt--;
4727 /* sa_ignore NO_NULL_CHK */
4728 sctp_free_bufspace(stcb, asoc, tp1, 1);
4729 sctp_m_freem(tp1->data);
4731 if (asoc->peer_supports_prsctp && PR_SCTP_BUF_ENABLED(tp1->flags)) {
4732 asoc->sent_queue_cnt_removeable--;
4735 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
4736 sctp_log_sack(asoc->last_acked_seq,
4738 tp1->rec.data.TSN_seq,
4741 SCTP_LOG_FREE_SENT);
4743 sctp_free_a_chunk(stcb, tp1, SCTP_SO_NOT_LOCKED);
4746 if (TAILQ_EMPTY(&asoc->sent_queue) && (asoc->total_flight > 0)) {
4748 panic("Warning flight size is postive and should be 0");
4750 SCTP_PRINTF("Warning flight size incorrect should be 0 is %d\n",
4751 asoc->total_flight);
4753 asoc->total_flight = 0;
4755 /* sa_ignore NO_NULL_CHK */
4756 if ((wake_him) && (stcb->sctp_socket)) {
4757 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4761 SOCKBUF_LOCK(&stcb->sctp_socket->so_snd);
4762 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) {
4763 sctp_wakeup_log(stcb, wake_him, SCTP_WAKESND_FROM_SACK);
4765 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4766 so = SCTP_INP_SO(stcb->sctp_ep);
4767 atomic_add_int(&stcb->asoc.refcnt, 1);
4768 SCTP_TCB_UNLOCK(stcb);
4769 SCTP_SOCKET_LOCK(so, 1);
4770 SCTP_TCB_LOCK(stcb);
4771 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4772 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
4773 /* assoc was freed while we were unlocked */
4774 SCTP_SOCKET_UNLOCK(so, 1);
4778 sctp_sowwakeup_locked(stcb->sctp_ep, stcb->sctp_socket);
4779 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4780 SCTP_SOCKET_UNLOCK(so, 1);
4783 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) {
4784 sctp_wakeup_log(stcb, wake_him, SCTP_NOWAKE_FROM_SACK);
4788 if (asoc->fast_retran_loss_recovery && accum_moved) {
4789 if (SCTP_TSN_GE(asoc->last_acked_seq, asoc->fast_recovery_tsn)) {
4790 /* Setup so we will exit RFC2582 fast recovery */
4791 will_exit_fast_recovery = 1;
4795 * Check for revoked fragments:
4797 * if Previous sack - Had no frags then we can't have any revoked if
4798 * Previous sack - Had frag's then - If we now have frags aka
4799 * num_seg > 0 call sctp_check_for_revoked() to tell if peer revoked
4800 * some of them. else - The peer revoked all ACKED fragments, since
4801 * we had some before and now we have NONE.
4805 sctp_check_for_revoked(stcb, asoc, cum_ack, biggest_tsn_acked);
4806 asoc->saw_sack_with_frags = 1;
4807 } else if (asoc->saw_sack_with_frags) {
4808 int cnt_revoked = 0;
4810 /* Peer revoked all dg's marked or acked */
4811 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
4812 if (tp1->sent == SCTP_DATAGRAM_ACKED) {
4813 tp1->sent = SCTP_DATAGRAM_SENT;
4814 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
4815 sctp_misc_ints(SCTP_FLIGHT_LOG_UP_REVOKE,
4816 tp1->whoTo->flight_size,
4818 (uintptr_t) tp1->whoTo,
4819 tp1->rec.data.TSN_seq);
4821 sctp_flight_size_increase(tp1);
4822 sctp_total_flight_increase(stcb, tp1);
4823 tp1->rec.data.chunk_was_revoked = 1;
4825 * To ensure that this increase in
4826 * flightsize, which is artificial, does not
4827 * throttle the sender, we also increase the
4828 * cwnd artificially.
4830 tp1->whoTo->cwnd += tp1->book_size;
4837 asoc->saw_sack_with_frags = 0;
4840 asoc->saw_sack_with_nr_frags = 1;
4842 asoc->saw_sack_with_nr_frags = 0;
4844 /* JRS - Use the congestion control given in the CC module */
4845 if (ecne_seen == 0) {
4846 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4847 if (net->net_ack2 > 0) {
4849 * Karn's rule applies to clearing error
4850 * count, this is optional.
4852 net->error_count = 0;
4853 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
4854 /* addr came good */
4855 net->dest_state |= SCTP_ADDR_REACHABLE;
4856 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
4857 0, (void *)net, SCTP_SO_NOT_LOCKED);
4859 if (net == stcb->asoc.primary_destination) {
4860 if (stcb->asoc.alternate) {
4862 * release the alternate,
4865 sctp_free_remote_addr(stcb->asoc.alternate);
4866 stcb->asoc.alternate = NULL;
4869 if (net->dest_state & SCTP_ADDR_PF) {
4870 net->dest_state &= ~SCTP_ADDR_PF;
4871 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
4872 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
4873 asoc->cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
4874 /* Done with this net */
4877 /* restore any doubled timers */
4878 net->RTO = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv;
4879 if (net->RTO < stcb->asoc.minrto) {
4880 net->RTO = stcb->asoc.minrto;
4882 if (net->RTO > stcb->asoc.maxrto) {
4883 net->RTO = stcb->asoc.maxrto;
4887 asoc->cc_functions.sctp_cwnd_update_after_sack(stcb, asoc, accum_moved, reneged_all, will_exit_fast_recovery);
4889 if (TAILQ_EMPTY(&asoc->sent_queue)) {
4890 /* nothing left in-flight */
4891 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4892 /* stop all timers */
4893 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
4894 stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_30);
4895 net->flight_size = 0;
4896 net->partial_bytes_acked = 0;
4898 asoc->total_flight = 0;
4899 asoc->total_flight_count = 0;
4901 /**********************************/
4902 /* Now what about shutdown issues */
4903 /**********************************/
4904 if (TAILQ_EMPTY(&asoc->send_queue) && TAILQ_EMPTY(&asoc->sent_queue)) {
4905 /* nothing left on sendqueue.. consider done */
4906 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
4907 sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK,
4908 asoc->peers_rwnd, 0, 0, a_rwnd);
4910 asoc->peers_rwnd = a_rwnd;
4911 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4912 /* SWS sender side engages */
4913 asoc->peers_rwnd = 0;
4916 if ((asoc->stream_queue_cnt == 1) &&
4917 ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
4918 (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED)) &&
4919 (asoc->locked_on_sending)
4921 struct sctp_stream_queue_pending *sp;
4924 * I may be in a state where we got all across.. but
4925 * cannot write more due to a shutdown... we abort
4926 * since the user did not indicate EOR in this case.
4928 sp = TAILQ_LAST(&((asoc->locked_on_sending)->outqueue),
4930 if ((sp) && (sp->length == 0)) {
4931 asoc->locked_on_sending = NULL;
4932 if (sp->msg_is_complete) {
4933 asoc->stream_queue_cnt--;
4935 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
4936 asoc->stream_queue_cnt--;
4940 if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) &&
4941 (asoc->stream_queue_cnt == 0)) {
4942 if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) {
4943 /* Need to abort here */
4949 oper = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
4950 0, M_DONTWAIT, 1, MT_DATA);
4952 struct sctp_paramhdr *ph;
4954 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr);
4955 ph = mtod(oper, struct sctp_paramhdr *);
4956 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
4957 ph->param_length = htons(SCTP_BUF_LEN(oper));
4959 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_31;
4960 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED);
4963 struct sctp_nets *netp;
4965 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
4966 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
4967 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
4969 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
4970 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
4971 sctp_stop_timers_for_shutdown(stcb);
4972 if (asoc->alternate) {
4973 netp = asoc->alternate;
4975 netp = asoc->primary_destination;
4977 sctp_send_shutdown(stcb, netp);
4978 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
4979 stcb->sctp_ep, stcb, netp);
4980 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
4981 stcb->sctp_ep, stcb, netp);
4984 } else if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) &&
4985 (asoc->stream_queue_cnt == 0)) {
4986 struct sctp_nets *netp;
4988 if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) {
4991 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
4992 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
4993 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
4994 sctp_stop_timers_for_shutdown(stcb);
4995 if (asoc->alternate) {
4996 netp = asoc->alternate;
4998 netp = asoc->primary_destination;
5000 sctp_send_shutdown_ack(stcb, netp);
5001 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
5002 stcb->sctp_ep, stcb, netp);
5007 * Now here we are going to recycle net_ack for a different use...
5010 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5015 * CMT DAC algorithm: If SACK DAC flag was 0, then no extra marking
5016 * to be done. Setting this_sack_lowest_newack to the cum_ack will
5017 * automatically ensure that.
5019 if ((asoc->sctp_cmt_on_off > 0) &&
5020 SCTP_BASE_SYSCTL(sctp_cmt_use_dac) &&
5021 (cmt_dac_flag == 0)) {
5022 this_sack_lowest_newack = cum_ack;
5024 if ((num_seg > 0) || (num_nr_seg > 0)) {
5025 sctp_strike_gap_ack_chunks(stcb, asoc, biggest_tsn_acked,
5026 biggest_tsn_newly_acked, this_sack_lowest_newack, accum_moved);
5028 /* JRS - Use the congestion control given in the CC module */
5029 asoc->cc_functions.sctp_cwnd_update_after_fr(stcb, asoc);
5031 /* Now are we exiting loss recovery ? */
5032 if (will_exit_fast_recovery) {
5033 /* Ok, we must exit fast recovery */
5034 asoc->fast_retran_loss_recovery = 0;
5036 if ((asoc->sat_t3_loss_recovery) &&
5037 SCTP_TSN_GE(asoc->last_acked_seq, asoc->sat_t3_recovery_tsn)) {
5038 /* end satellite t3 loss recovery */
5039 asoc->sat_t3_loss_recovery = 0;
5044 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5045 if (net->will_exit_fast_recovery) {
5046 /* Ok, we must exit fast recovery */
5047 net->fast_retran_loss_recovery = 0;
5051 /* Adjust and set the new rwnd value */
5052 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
5053 sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK,
5054 asoc->peers_rwnd, asoc->total_flight, (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)), a_rwnd);
5056 asoc->peers_rwnd = sctp_sbspace_sub(a_rwnd,
5057 (uint32_t) (asoc->total_flight + (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh))));
5058 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
5059 /* SWS sender side engages */
5060 asoc->peers_rwnd = 0;
5062 if (asoc->peers_rwnd > old_rwnd) {
5063 win_probe_recovery = 1;
5066 * Now we must setup so we have a timer up for anyone with
5072 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5073 if (win_probe_recovery && (net->window_probe)) {
5074 win_probe_recovered = 1;
5076 * Find first chunk that was used with
5077 * window probe and clear the event. Put
5078 * it back into the send queue as if has
5081 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
5082 if (tp1->window_probe) {
5083 sctp_window_probe_recovery(stcb, asoc, tp1);
5088 if (net->flight_size) {
5090 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
5091 sctp_timer_start(SCTP_TIMER_TYPE_SEND,
5092 stcb->sctp_ep, stcb, net);
5094 if (net->window_probe) {
5095 net->window_probe = 0;
5098 if (net->window_probe) {
5100 * In window probes we must assure a timer
5101 * is still running there
5103 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
5104 sctp_timer_start(SCTP_TIMER_TYPE_SEND,
5105 stcb->sctp_ep, stcb, net);
5108 } else if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
5109 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
5111 SCTP_FROM_SCTP_INDATA + SCTP_LOC_22);
5116 (!TAILQ_EMPTY(&asoc->sent_queue)) &&
5117 (asoc->sent_queue_retran_cnt == 0) &&
5118 (win_probe_recovered == 0) &&
5121 * huh, this should not happen unless all packets are
5122 * PR-SCTP and marked to skip of course.
5124 if (sctp_fs_audit(asoc)) {
5125 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5126 net->flight_size = 0;
5128 asoc->total_flight = 0;
5129 asoc->total_flight_count = 0;
5130 asoc->sent_queue_retran_cnt = 0;
5131 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
5132 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
5133 sctp_flight_size_increase(tp1);
5134 sctp_total_flight_increase(stcb, tp1);
5135 } else if (tp1->sent == SCTP_DATAGRAM_RESEND) {
5136 sctp_ucount_incr(asoc->sent_queue_retran_cnt);
5143 /*********************************************/
5144 /* Here we perform PR-SCTP procedures */
5146 /*********************************************/
5147 /* C1. update advancedPeerAckPoint */
5148 if (SCTP_TSN_GT(cum_ack, asoc->advanced_peer_ack_point)) {
5149 asoc->advanced_peer_ack_point = cum_ack;
5151 /* C2. try to further move advancedPeerAckPoint ahead */
5152 if ((asoc->peer_supports_prsctp) && (asoc->pr_sctp_cnt > 0)) {
5153 struct sctp_tmit_chunk *lchk;
5154 uint32_t old_adv_peer_ack_point;
5156 old_adv_peer_ack_point = asoc->advanced_peer_ack_point;
5157 lchk = sctp_try_advance_peer_ack_point(stcb, asoc);
5158 /* C3. See if we need to send a Fwd-TSN */
5159 if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, cum_ack)) {
5161 * ISSUE with ECN, see FWD-TSN processing.
5163 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
5164 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
5165 0xee, cum_ack, asoc->advanced_peer_ack_point,
5166 old_adv_peer_ack_point);
5168 if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, old_adv_peer_ack_point)) {
5169 send_forward_tsn(stcb, asoc);
5171 /* try to FR fwd-tsn's that get lost too */
5172 if (lchk->rec.data.fwd_tsn_cnt >= 3) {
5173 send_forward_tsn(stcb, asoc);
5178 /* Assure a timer is up */
5179 sctp_timer_start(SCTP_TIMER_TYPE_SEND,
5180 stcb->sctp_ep, stcb, lchk->whoTo);
5183 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_RWND_LOGGING_ENABLE) {
5184 sctp_misc_ints(SCTP_SACK_RWND_UPDATE,
5186 stcb->asoc.peers_rwnd,
5187 stcb->asoc.total_flight,
5188 stcb->asoc.total_output_queue_size);
5193 sctp_update_acked(struct sctp_tcb *stcb, struct sctp_shutdown_chunk *cp, int *abort_flag)
5196 uint32_t cum_ack, a_rwnd;
5198 cum_ack = ntohl(cp->cumulative_tsn_ack);
5199 /* Arrange so a_rwnd does NOT change */
5200 a_rwnd = stcb->asoc.peers_rwnd + stcb->asoc.total_flight;
5202 /* Now call the express sack handling */
5203 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, abort_flag, 0);
5207 sctp_kick_prsctp_reorder_queue(struct sctp_tcb *stcb,
5208 struct sctp_stream_in *strmin)
5210 struct sctp_queued_to_read *ctl, *nctl;
5211 struct sctp_association *asoc;
5215 tt = strmin->last_sequence_delivered;
5217 * First deliver anything prior to and including the stream no that
5220 TAILQ_FOREACH_SAFE(ctl, &strmin->inqueue, next, nctl) {
5221 if (SCTP_SSN_GE(tt, ctl->sinfo_ssn)) {
5222 /* this is deliverable now */
5223 TAILQ_REMOVE(&strmin->inqueue, ctl, next);
5224 /* subtract pending on streams */
5225 asoc->size_on_all_streams -= ctl->length;
5226 sctp_ucount_decr(asoc->cnt_on_all_streams);
5227 /* deliver it to at least the delivery-q */
5228 if (stcb->sctp_socket) {
5229 sctp_mark_non_revokable(asoc, ctl->sinfo_tsn);
5230 sctp_add_to_readq(stcb->sctp_ep, stcb,
5232 &stcb->sctp_socket->so_rcv, 1, SCTP_READ_LOCK_HELD, SCTP_SO_NOT_LOCKED);
5235 /* no more delivery now. */
5240 * now we must deliver things in queue the normal way if any are
5243 tt = strmin->last_sequence_delivered + 1;
5244 TAILQ_FOREACH_SAFE(ctl, &strmin->inqueue, next, nctl) {
5245 if (tt == ctl->sinfo_ssn) {
5246 /* this is deliverable now */
5247 TAILQ_REMOVE(&strmin->inqueue, ctl, next);
5248 /* subtract pending on streams */
5249 asoc->size_on_all_streams -= ctl->length;
5250 sctp_ucount_decr(asoc->cnt_on_all_streams);
5251 /* deliver it to at least the delivery-q */
5252 strmin->last_sequence_delivered = ctl->sinfo_ssn;
5253 if (stcb->sctp_socket) {
5254 sctp_mark_non_revokable(asoc, ctl->sinfo_tsn);
5255 sctp_add_to_readq(stcb->sctp_ep, stcb,
5257 &stcb->sctp_socket->so_rcv, 1, SCTP_READ_LOCK_HELD, SCTP_SO_NOT_LOCKED);
5260 tt = strmin->last_sequence_delivered + 1;
5268 sctp_flush_reassm_for_str_seq(struct sctp_tcb *stcb,
5269 struct sctp_association *asoc,
5270 uint16_t stream, uint16_t seq)
5272 struct sctp_tmit_chunk *chk, *nchk;
5274 /* For each one on here see if we need to toss it */
5276 * For now large messages held on the reasmqueue that are complete
5277 * will be tossed too. We could in theory do more work to spin
5278 * through and stop after dumping one msg aka seeing the start of a
5279 * new msg at the head, and call the delivery function... to see if
5280 * it can be delivered... But for now we just dump everything on the
5283 TAILQ_FOREACH_SAFE(chk, &asoc->reasmqueue, sctp_next, nchk) {
5285 * Do not toss it if on a different stream or marked for
5286 * unordered delivery in which case the stream sequence
5287 * number has no meaning.
5289 if ((chk->rec.data.stream_number != stream) ||
5290 ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == SCTP_DATA_UNORDERED)) {
5293 if (chk->rec.data.stream_seq == seq) {
5294 /* It needs to be tossed */
5295 TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next);
5296 if (SCTP_TSN_GT(chk->rec.data.TSN_seq, asoc->tsn_last_delivered)) {
5297 asoc->tsn_last_delivered = chk->rec.data.TSN_seq;
5298 asoc->str_of_pdapi = chk->rec.data.stream_number;
5299 asoc->ssn_of_pdapi = chk->rec.data.stream_seq;
5300 asoc->fragment_flags = chk->rec.data.rcv_flags;
5302 asoc->size_on_reasm_queue -= chk->send_size;
5303 sctp_ucount_decr(asoc->cnt_on_reasm_queue);
5305 /* Clear up any stream problem */
5306 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) != SCTP_DATA_UNORDERED &&
5307 SCTP_SSN_GT(chk->rec.data.stream_seq, asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered)) {
5309 * We must dump forward this streams
5310 * sequence number if the chunk is not
5311 * unordered that is being skipped. There is
5312 * a chance that if the peer does not
5313 * include the last fragment in its FWD-TSN
5314 * we WILL have a problem here since you
5315 * would have a partial chunk in queue that
5316 * may not be deliverable. Also if a Partial
5317 * delivery API as started the user may get
5318 * a partial chunk. The next read returning
5319 * a new chunk... really ugly but I see no
5320 * way around it! Maybe a notify??
5322 asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered = chk->rec.data.stream_seq;
5325 sctp_m_freem(chk->data);
5328 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
5329 } else if (SCTP_SSN_GT(chk->rec.data.stream_seq, seq)) {
5331 * If the stream_seq is > than the purging one, we
5341 sctp_handle_forward_tsn(struct sctp_tcb *stcb,
5342 struct sctp_forward_tsn_chunk *fwd,
5343 int *abort_flag, struct mbuf *m, int offset)
5345 /* The pr-sctp fwd tsn */
5347 * here we will perform all the data receiver side steps for
5348 * processing FwdTSN, as required in by pr-sctp draft:
5350 * Assume we get FwdTSN(x):
5352 * 1) update local cumTSN to x 2) try to further advance cumTSN to x +
5353 * others we have 3) examine and update re-ordering queue on
5354 * pr-in-streams 4) clean up re-assembly queue 5) Send a sack to
5355 * report where we are.
5357 struct sctp_association *asoc;
5358 uint32_t new_cum_tsn, gap;
5359 unsigned int i, fwd_sz, m_size;
5361 struct sctp_stream_in *strm;
5362 struct sctp_tmit_chunk *chk, *nchk;
5363 struct sctp_queued_to_read *ctl, *sv;
5366 if ((fwd_sz = ntohs(fwd->ch.chunk_length)) < sizeof(struct sctp_forward_tsn_chunk)) {
5367 SCTPDBG(SCTP_DEBUG_INDATA1,
5368 "Bad size too small/big fwd-tsn\n");
5371 m_size = (stcb->asoc.mapping_array_size << 3);
5372 /*************************************************************/
5373 /* 1. Here we update local cumTSN and shift the bitmap array */
5374 /*************************************************************/
5375 new_cum_tsn = ntohl(fwd->new_cumulative_tsn);
5377 if (SCTP_TSN_GE(asoc->cumulative_tsn, new_cum_tsn)) {
5378 /* Already got there ... */
5382 * now we know the new TSN is more advanced, let's find the actual
5385 SCTP_CALC_TSN_TO_GAP(gap, new_cum_tsn, asoc->mapping_array_base_tsn);
5386 asoc->cumulative_tsn = new_cum_tsn;
5387 if (gap >= m_size) {
5388 if ((long)gap > sctp_sbspace(&stcb->asoc, &stcb->sctp_socket->so_rcv)) {
5392 * out of range (of single byte chunks in the rwnd I
5393 * give out). This must be an attacker.
5396 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
5397 0, M_DONTWAIT, 1, MT_DATA);
5399 struct sctp_paramhdr *ph;
5402 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
5403 (sizeof(uint32_t) * 3);
5404 ph = mtod(oper, struct sctp_paramhdr *);
5405 ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5406 ph->param_length = htons(SCTP_BUF_LEN(oper));
5407 ippp = (uint32_t *) (ph + 1);
5408 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_33);
5410 *ippp = asoc->highest_tsn_inside_map;
5412 *ippp = new_cum_tsn;
5414 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_33;
5415 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED);
5418 SCTP_STAT_INCR(sctps_fwdtsn_map_over);
5420 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
5421 asoc->mapping_array_base_tsn = new_cum_tsn + 1;
5422 asoc->highest_tsn_inside_map = new_cum_tsn;
5424 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
5425 asoc->highest_tsn_inside_nr_map = new_cum_tsn;
5427 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
5428 sctp_log_map(0, 3, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
5431 SCTP_TCB_LOCK_ASSERT(stcb);
5432 for (i = 0; i <= gap; i++) {
5433 if (!SCTP_IS_TSN_PRESENT(asoc->mapping_array, i) &&
5434 !SCTP_IS_TSN_PRESENT(asoc->nr_mapping_array, i)) {
5435 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, i);
5436 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn + i, asoc->highest_tsn_inside_nr_map)) {
5437 asoc->highest_tsn_inside_nr_map = asoc->mapping_array_base_tsn + i;
5442 /*************************************************************/
5443 /* 2. Clear up re-assembly queue */
5444 /*************************************************************/
5446 * First service it if pd-api is up, just in case we can progress it
5449 if (asoc->fragmented_delivery_inprogress) {
5450 sctp_service_reassembly(stcb, asoc);
5452 /* For each one on here see if we need to toss it */
5454 * For now large messages held on the reasmqueue that are complete
5455 * will be tossed too. We could in theory do more work to spin
5456 * through and stop after dumping one msg aka seeing the start of a
5457 * new msg at the head, and call the delivery function... to see if
5458 * it can be delivered... But for now we just dump everything on the
5461 TAILQ_FOREACH_SAFE(chk, &asoc->reasmqueue, sctp_next, nchk) {
5462 if (SCTP_TSN_GE(new_cum_tsn, chk->rec.data.TSN_seq)) {
5463 /* It needs to be tossed */
5464 TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next);
5465 if (SCTP_TSN_GT(chk->rec.data.TSN_seq, asoc->tsn_last_delivered)) {
5466 asoc->tsn_last_delivered = chk->rec.data.TSN_seq;
5467 asoc->str_of_pdapi = chk->rec.data.stream_number;
5468 asoc->ssn_of_pdapi = chk->rec.data.stream_seq;
5469 asoc->fragment_flags = chk->rec.data.rcv_flags;
5471 asoc->size_on_reasm_queue -= chk->send_size;
5472 sctp_ucount_decr(asoc->cnt_on_reasm_queue);
5474 /* Clear up any stream problem */
5475 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) != SCTP_DATA_UNORDERED &&
5476 SCTP_SSN_GT(chk->rec.data.stream_seq, asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered)) {
5478 * We must dump forward this streams
5479 * sequence number if the chunk is not
5480 * unordered that is being skipped. There is
5481 * a chance that if the peer does not
5482 * include the last fragment in its FWD-TSN
5483 * we WILL have a problem here since you
5484 * would have a partial chunk in queue that
5485 * may not be deliverable. Also if a Partial
5486 * delivery API as started the user may get
5487 * a partial chunk. The next read returning
5488 * a new chunk... really ugly but I see no
5489 * way around it! Maybe a notify??
5491 asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered = chk->rec.data.stream_seq;
5494 sctp_m_freem(chk->data);
5497 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
5500 * Ok we have gone beyond the end of the fwd-tsn's
5506 /*******************************************************/
5507 /* 3. Update the PR-stream re-ordering queues and fix */
5508 /* delivery issues as needed. */
5509 /*******************************************************/
5510 fwd_sz -= sizeof(*fwd);
5513 unsigned int num_str;
5514 struct sctp_strseq *stseq, strseqbuf;
5516 offset += sizeof(*fwd);
5518 SCTP_INP_READ_LOCK(stcb->sctp_ep);
5519 num_str = fwd_sz / sizeof(struct sctp_strseq);
5520 for (i = 0; i < num_str; i++) {
5523 stseq = (struct sctp_strseq *)sctp_m_getptr(m, offset,
5524 sizeof(struct sctp_strseq),
5525 (uint8_t *) & strseqbuf);
5526 offset += sizeof(struct sctp_strseq);
5527 if (stseq == NULL) {
5531 st = ntohs(stseq->stream);
5533 st = ntohs(stseq->sequence);
5534 stseq->sequence = st;
5539 * Ok we now look for the stream/seq on the read
5540 * queue where its not all delivered. If we find it
5541 * we transmute the read entry into a PDI_ABORTED.
5543 if (stseq->stream >= asoc->streamincnt) {
5544 /* screwed up streams, stop! */
5547 if ((asoc->str_of_pdapi == stseq->stream) &&
5548 (asoc->ssn_of_pdapi == stseq->sequence)) {
5550 * If this is the one we were partially
5551 * delivering now then we no longer are.
5552 * Note this will change with the reassembly
5555 asoc->fragmented_delivery_inprogress = 0;
5557 sctp_flush_reassm_for_str_seq(stcb, asoc, stseq->stream, stseq->sequence);
5558 TAILQ_FOREACH(ctl, &stcb->sctp_ep->read_queue, next) {
5559 if ((ctl->sinfo_stream == stseq->stream) &&
5560 (ctl->sinfo_ssn == stseq->sequence)) {
5561 str_seq = (stseq->stream << 16) | stseq->sequence;
5563 ctl->pdapi_aborted = 1;
5564 sv = stcb->asoc.control_pdapi;
5565 stcb->asoc.control_pdapi = ctl;
5566 sctp_ulp_notify(SCTP_NOTIFY_PARTIAL_DELVIERY_INDICATION,
5568 SCTP_PARTIAL_DELIVERY_ABORTED,
5570 SCTP_SO_NOT_LOCKED);
5571 stcb->asoc.control_pdapi = sv;
5573 } else if ((ctl->sinfo_stream == stseq->stream) &&
5574 SCTP_SSN_GT(ctl->sinfo_ssn, stseq->sequence)) {
5575 /* We are past our victim SSN */
5579 strm = &asoc->strmin[stseq->stream];
5580 if (SCTP_SSN_GT(stseq->sequence, strm->last_sequence_delivered)) {
5581 /* Update the sequence number */
5582 strm->last_sequence_delivered = stseq->sequence;
5584 /* now kick the stream the new way */
5585 /* sa_ignore NO_NULL_CHK */
5586 sctp_kick_prsctp_reorder_queue(stcb, strm);
5588 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
5591 * Now slide thing forward.
5593 sctp_slide_mapping_arrays(stcb);
5595 if (!TAILQ_EMPTY(&asoc->reasmqueue)) {
5596 /* now lets kick out and check for more fragmented delivery */
5597 /* sa_ignore NO_NULL_CHK */
5598 sctp_deliver_reasm_check(stcb, &stcb->asoc);
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