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) {
1422 sctp_process_a_data_chunk(struct sctp_tcb *stcb, struct sctp_association *asoc,
1423 struct mbuf **m, int offset, struct sctp_data_chunk *ch, int chk_length,
1424 struct sctp_nets *net, uint32_t * high_tsn, int *abort_flag,
1425 int *break_flag, int last_chunk)
1427 /* Process a data chunk */
1428 /* struct sctp_tmit_chunk *chk; */
1429 struct sctp_tmit_chunk *chk;
1433 int need_reasm_check = 0;
1434 uint16_t strmno, strmseq;
1436 struct sctp_queued_to_read *control;
1438 uint32_t protocol_id;
1439 uint8_t chunk_flags;
1440 struct sctp_stream_reset_list *liste;
1443 tsn = ntohl(ch->dp.tsn);
1444 chunk_flags = ch->ch.chunk_flags;
1445 if ((chunk_flags & SCTP_DATA_SACK_IMMEDIATELY) == SCTP_DATA_SACK_IMMEDIATELY) {
1446 asoc->send_sack = 1;
1448 protocol_id = ch->dp.protocol_id;
1449 ordered = ((chunk_flags & SCTP_DATA_UNORDERED) == 0);
1450 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
1451 sctp_log_map(tsn, asoc->cumulative_tsn, asoc->highest_tsn_inside_map, SCTP_MAP_TSN_ENTERS);
1456 SCTP_LTRACE_CHK(stcb->sctp_ep, stcb, ch->ch.chunk_type, tsn);
1457 if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
1458 /* It is a duplicate */
1459 SCTP_STAT_INCR(sctps_recvdupdata);
1460 if (asoc->numduptsns < SCTP_MAX_DUP_TSNS) {
1461 /* Record a dup for the next outbound sack */
1462 asoc->dup_tsns[asoc->numduptsns] = tsn;
1465 asoc->send_sack = 1;
1468 /* Calculate the number of TSN's between the base and this TSN */
1469 SCTP_CALC_TSN_TO_GAP(gap, tsn, asoc->mapping_array_base_tsn);
1470 if (gap >= (SCTP_MAPPING_ARRAY << 3)) {
1471 /* Can't hold the bit in the mapping at max array, toss it */
1474 if (gap >= (uint32_t) (asoc->mapping_array_size << 3)) {
1475 SCTP_TCB_LOCK_ASSERT(stcb);
1476 if (sctp_expand_mapping_array(asoc, gap)) {
1477 /* Can't expand, drop it */
1481 if (SCTP_TSN_GT(tsn, *high_tsn)) {
1484 /* See if we have received this one already */
1485 if (SCTP_IS_TSN_PRESENT(asoc->mapping_array, gap) ||
1486 SCTP_IS_TSN_PRESENT(asoc->nr_mapping_array, gap)) {
1487 SCTP_STAT_INCR(sctps_recvdupdata);
1488 if (asoc->numduptsns < SCTP_MAX_DUP_TSNS) {
1489 /* Record a dup for the next outbound sack */
1490 asoc->dup_tsns[asoc->numduptsns] = tsn;
1493 asoc->send_sack = 1;
1497 * Check to see about the GONE flag, duplicates would cause a sack
1498 * to be sent up above
1500 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
1501 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
1502 (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET))
1505 * wait a minute, this guy is gone, there is no longer a
1506 * receiver. Send peer an ABORT!
1508 struct mbuf *op_err;
1510 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
1511 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
1516 * Now before going further we see if there is room. If NOT then we
1517 * MAY let one through only IF this TSN is the one we are waiting
1518 * for on a partial delivery API.
1521 /* now do the tests */
1522 if (((asoc->cnt_on_all_streams +
1523 asoc->cnt_on_reasm_queue +
1524 asoc->cnt_msg_on_sb) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue)) ||
1525 (((int)asoc->my_rwnd) <= 0)) {
1527 * When we have NO room in the rwnd we check to make sure
1528 * the reader is doing its job...
1530 if (stcb->sctp_socket->so_rcv.sb_cc) {
1531 /* some to read, wake-up */
1532 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1535 so = SCTP_INP_SO(stcb->sctp_ep);
1536 atomic_add_int(&stcb->asoc.refcnt, 1);
1537 SCTP_TCB_UNLOCK(stcb);
1538 SCTP_SOCKET_LOCK(so, 1);
1539 SCTP_TCB_LOCK(stcb);
1540 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1541 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1542 /* assoc was freed while we were unlocked */
1543 SCTP_SOCKET_UNLOCK(so, 1);
1547 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
1548 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1549 SCTP_SOCKET_UNLOCK(so, 1);
1552 /* now is it in the mapping array of what we have accepted? */
1553 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_map) &&
1554 SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) {
1555 /* Nope not in the valid range dump it */
1556 sctp_set_rwnd(stcb, asoc);
1557 if ((asoc->cnt_on_all_streams +
1558 asoc->cnt_on_reasm_queue +
1559 asoc->cnt_msg_on_sb) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue)) {
1560 SCTP_STAT_INCR(sctps_datadropchklmt);
1562 SCTP_STAT_INCR(sctps_datadroprwnd);
1568 strmno = ntohs(ch->dp.stream_id);
1569 if (strmno >= asoc->streamincnt) {
1570 struct sctp_paramhdr *phdr;
1573 mb = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) * 2),
1574 0, M_DONTWAIT, 1, MT_DATA);
1576 /* add some space up front so prepend will work well */
1577 SCTP_BUF_RESV_UF(mb, sizeof(struct sctp_chunkhdr));
1578 phdr = mtod(mb, struct sctp_paramhdr *);
1580 * Error causes are just param's and this one has
1581 * two back to back phdr, one with the error type
1582 * and size, the other with the streamid and a rsvd
1584 SCTP_BUF_LEN(mb) = (sizeof(struct sctp_paramhdr) * 2);
1585 phdr->param_type = htons(SCTP_CAUSE_INVALID_STREAM);
1586 phdr->param_length =
1587 htons(sizeof(struct sctp_paramhdr) * 2);
1589 /* We insert the stream in the type field */
1590 phdr->param_type = ch->dp.stream_id;
1591 /* And set the length to 0 for the rsvd field */
1592 phdr->param_length = 0;
1593 sctp_queue_op_err(stcb, mb);
1595 SCTP_STAT_INCR(sctps_badsid);
1596 SCTP_TCB_LOCK_ASSERT(stcb);
1597 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap);
1598 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) {
1599 asoc->highest_tsn_inside_nr_map = tsn;
1601 if (tsn == (asoc->cumulative_tsn + 1)) {
1602 /* Update cum-ack */
1603 asoc->cumulative_tsn = tsn;
1608 * Before we continue lets validate that we are not being fooled by
1609 * an evil attacker. We can only have 4k chunks based on our TSN
1610 * spread allowed by the mapping array 512 * 8 bits, so there is no
1611 * way our stream sequence numbers could have wrapped. We of course
1612 * only validate the FIRST fragment so the bit must be set.
1614 strmseq = ntohs(ch->dp.stream_sequence);
1615 #ifdef SCTP_ASOCLOG_OF_TSNS
1616 SCTP_TCB_LOCK_ASSERT(stcb);
1617 if (asoc->tsn_in_at >= SCTP_TSN_LOG_SIZE) {
1618 asoc->tsn_in_at = 0;
1619 asoc->tsn_in_wrapped = 1;
1621 asoc->in_tsnlog[asoc->tsn_in_at].tsn = tsn;
1622 asoc->in_tsnlog[asoc->tsn_in_at].strm = strmno;
1623 asoc->in_tsnlog[asoc->tsn_in_at].seq = strmseq;
1624 asoc->in_tsnlog[asoc->tsn_in_at].sz = chk_length;
1625 asoc->in_tsnlog[asoc->tsn_in_at].flgs = chunk_flags;
1626 asoc->in_tsnlog[asoc->tsn_in_at].stcb = (void *)stcb;
1627 asoc->in_tsnlog[asoc->tsn_in_at].in_pos = asoc->tsn_in_at;
1628 asoc->in_tsnlog[asoc->tsn_in_at].in_out = 1;
1631 if ((chunk_flags & SCTP_DATA_FIRST_FRAG) &&
1632 (TAILQ_EMPTY(&asoc->resetHead)) &&
1633 (chunk_flags & SCTP_DATA_UNORDERED) == 0 &&
1634 SCTP_SSN_GE(asoc->strmin[strmno].last_sequence_delivered, strmseq)) {
1635 /* The incoming sseq is behind where we last delivered? */
1636 SCTPDBG(SCTP_DEBUG_INDATA1, "EVIL/Broken-Dup S-SEQ:%d delivered:%d from peer, Abort!\n",
1637 strmseq, asoc->strmin[strmno].last_sequence_delivered);
1638 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
1639 0, M_DONTWAIT, 1, MT_DATA);
1641 struct sctp_paramhdr *ph;
1644 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
1645 (3 * sizeof(uint32_t));
1646 ph = mtod(oper, struct sctp_paramhdr *);
1647 ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
1648 ph->param_length = htons(SCTP_BUF_LEN(oper));
1649 ippp = (uint32_t *) (ph + 1);
1650 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_14);
1654 *ippp = ((strmno << 16) | strmseq);
1657 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_14;
1658 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED);
1662 /************************************
1663 * From here down we may find ch-> invalid
1664 * so its a good idea NOT to use it.
1665 *************************************/
1667 the_len = (chk_length - sizeof(struct sctp_data_chunk));
1668 if (last_chunk == 0) {
1669 dmbuf = SCTP_M_COPYM(*m,
1670 (offset + sizeof(struct sctp_data_chunk)),
1671 the_len, M_DONTWAIT);
1672 #ifdef SCTP_MBUF_LOGGING
1673 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
1676 for (mat = dmbuf; mat; mat = SCTP_BUF_NEXT(mat)) {
1677 if (SCTP_BUF_IS_EXTENDED(mat)) {
1678 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
1684 /* We can steal the last chunk */
1688 /* lop off the top part */
1689 m_adj(dmbuf, (offset + sizeof(struct sctp_data_chunk)));
1690 if (SCTP_BUF_NEXT(dmbuf) == NULL) {
1691 l_len = SCTP_BUF_LEN(dmbuf);
1694 * need to count up the size hopefully does not hit
1700 for (lat = dmbuf; lat; lat = SCTP_BUF_NEXT(lat)) {
1701 l_len += SCTP_BUF_LEN(lat);
1704 if (l_len > the_len) {
1705 /* Trim the end round bytes off too */
1706 m_adj(dmbuf, -(l_len - the_len));
1709 if (dmbuf == NULL) {
1710 SCTP_STAT_INCR(sctps_nomem);
1713 if ((chunk_flags & SCTP_DATA_NOT_FRAG) == SCTP_DATA_NOT_FRAG &&
1714 asoc->fragmented_delivery_inprogress == 0 &&
1715 TAILQ_EMPTY(&asoc->resetHead) &&
1717 ((uint16_t) (asoc->strmin[strmno].last_sequence_delivered + 1) == strmseq &&
1718 TAILQ_EMPTY(&asoc->strmin[strmno].inqueue)))) {
1719 /* Candidate for express delivery */
1721 * Its not fragmented, No PD-API is up, Nothing in the
1722 * delivery queue, Its un-ordered OR ordered and the next to
1723 * deliver AND nothing else is stuck on the stream queue,
1724 * And there is room for it in the socket buffer. Lets just
1725 * stuff it up the buffer....
1728 /* It would be nice to avoid this copy if we could :< */
1729 sctp_alloc_a_readq(stcb, control);
1730 sctp_build_readq_entry_mac(control, stcb, asoc->context, net, tsn,
1736 if (control == NULL) {
1737 goto failed_express_del;
1739 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap);
1740 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) {
1741 asoc->highest_tsn_inside_nr_map = tsn;
1743 sctp_add_to_readq(stcb->sctp_ep, stcb,
1744 control, &stcb->sctp_socket->so_rcv,
1745 1, SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED);
1747 if ((chunk_flags & SCTP_DATA_UNORDERED) == 0) {
1748 /* for ordered, bump what we delivered */
1749 asoc->strmin[strmno].last_sequence_delivered++;
1751 SCTP_STAT_INCR(sctps_recvexpress);
1752 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
1753 sctp_log_strm_del_alt(stcb, tsn, strmseq, strmno,
1754 SCTP_STR_LOG_FROM_EXPRS_DEL);
1758 goto finish_express_del;
1761 /* If we reach here this is a new chunk */
1764 /* Express for fragmented delivery? */
1765 if ((asoc->fragmented_delivery_inprogress) &&
1766 (stcb->asoc.control_pdapi) &&
1767 (asoc->str_of_pdapi == strmno) &&
1768 (asoc->ssn_of_pdapi == strmseq)
1770 control = stcb->asoc.control_pdapi;
1771 if ((chunk_flags & SCTP_DATA_FIRST_FRAG) == SCTP_DATA_FIRST_FRAG) {
1772 /* Can't be another first? */
1773 goto failed_pdapi_express_del;
1775 if (tsn == (control->sinfo_tsn + 1)) {
1776 /* Yep, we can add it on */
1779 if (chunk_flags & SCTP_DATA_LAST_FRAG) {
1782 if (sctp_append_to_readq(stcb->sctp_ep, stcb, control, dmbuf, end,
1784 &stcb->sctp_socket->so_rcv)) {
1785 SCTP_PRINTF("Append fails end:%d\n", end);
1786 goto failed_pdapi_express_del;
1788 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap);
1789 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) {
1790 asoc->highest_tsn_inside_nr_map = tsn;
1792 SCTP_STAT_INCR(sctps_recvexpressm);
1793 control->sinfo_tsn = tsn;
1794 asoc->tsn_last_delivered = tsn;
1795 asoc->fragment_flags = chunk_flags;
1796 asoc->tsn_of_pdapi_last_delivered = tsn;
1797 asoc->last_flags_delivered = chunk_flags;
1798 asoc->last_strm_seq_delivered = strmseq;
1799 asoc->last_strm_no_delivered = strmno;
1801 /* clean up the flags and such */
1802 asoc->fragmented_delivery_inprogress = 0;
1803 if ((chunk_flags & SCTP_DATA_UNORDERED) == 0) {
1804 asoc->strmin[strmno].last_sequence_delivered++;
1806 stcb->asoc.control_pdapi = NULL;
1807 if (TAILQ_EMPTY(&asoc->reasmqueue) == 0) {
1809 * There could be another message
1812 need_reasm_check = 1;
1816 goto finish_express_del;
1819 failed_pdapi_express_del:
1821 if (SCTP_BASE_SYSCTL(sctp_do_drain) == 0) {
1822 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap);
1823 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) {
1824 asoc->highest_tsn_inside_nr_map = tsn;
1827 SCTP_SET_TSN_PRESENT(asoc->mapping_array, gap);
1828 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_map)) {
1829 asoc->highest_tsn_inside_map = tsn;
1832 if ((chunk_flags & SCTP_DATA_NOT_FRAG) != SCTP_DATA_NOT_FRAG) {
1833 sctp_alloc_a_chunk(stcb, chk);
1835 /* No memory so we drop the chunk */
1836 SCTP_STAT_INCR(sctps_nomem);
1837 if (last_chunk == 0) {
1838 /* we copied it, free the copy */
1839 sctp_m_freem(dmbuf);
1843 chk->rec.data.TSN_seq = tsn;
1844 chk->no_fr_allowed = 0;
1845 chk->rec.data.stream_seq = strmseq;
1846 chk->rec.data.stream_number = strmno;
1847 chk->rec.data.payloadtype = protocol_id;
1848 chk->rec.data.context = stcb->asoc.context;
1849 chk->rec.data.doing_fast_retransmit = 0;
1850 chk->rec.data.rcv_flags = chunk_flags;
1852 chk->send_size = the_len;
1854 atomic_add_int(&net->ref_count, 1);
1857 sctp_alloc_a_readq(stcb, control);
1858 sctp_build_readq_entry_mac(control, stcb, asoc->context, net, tsn,
1864 if (control == NULL) {
1865 /* No memory so we drop the chunk */
1866 SCTP_STAT_INCR(sctps_nomem);
1867 if (last_chunk == 0) {
1868 /* we copied it, free the copy */
1869 sctp_m_freem(dmbuf);
1873 control->length = the_len;
1876 /* Mark it as received */
1877 /* Now queue it where it belongs */
1878 if (control != NULL) {
1879 /* First a sanity check */
1880 if (asoc->fragmented_delivery_inprogress) {
1882 * Ok, we have a fragmented delivery in progress if
1883 * this chunk is next to deliver OR belongs in our
1884 * view to the reassembly, the peer is evil or
1887 uint32_t estimate_tsn;
1889 estimate_tsn = asoc->tsn_last_delivered + 1;
1890 if (TAILQ_EMPTY(&asoc->reasmqueue) &&
1891 (estimate_tsn == control->sinfo_tsn)) {
1892 /* Evil/Broke peer */
1893 sctp_m_freem(control->data);
1894 control->data = NULL;
1895 if (control->whoFrom) {
1896 sctp_free_remote_addr(control->whoFrom);
1897 control->whoFrom = NULL;
1899 sctp_free_a_readq(stcb, control);
1900 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
1901 0, M_DONTWAIT, 1, MT_DATA);
1903 struct sctp_paramhdr *ph;
1906 SCTP_BUF_LEN(oper) =
1907 sizeof(struct sctp_paramhdr) +
1908 (3 * sizeof(uint32_t));
1909 ph = mtod(oper, struct sctp_paramhdr *);
1911 htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
1912 ph->param_length = htons(SCTP_BUF_LEN(oper));
1913 ippp = (uint32_t *) (ph + 1);
1914 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_15);
1918 *ippp = ((strmno << 16) | strmseq);
1920 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_15;
1921 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED);
1925 if (sctp_does_tsn_belong_to_reasm(asoc, control->sinfo_tsn)) {
1926 sctp_m_freem(control->data);
1927 control->data = NULL;
1928 if (control->whoFrom) {
1929 sctp_free_remote_addr(control->whoFrom);
1930 control->whoFrom = NULL;
1932 sctp_free_a_readq(stcb, control);
1934 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
1935 0, M_DONTWAIT, 1, MT_DATA);
1937 struct sctp_paramhdr *ph;
1940 SCTP_BUF_LEN(oper) =
1941 sizeof(struct sctp_paramhdr) +
1942 (3 * sizeof(uint32_t));
1944 struct sctp_paramhdr *);
1946 htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
1948 htons(SCTP_BUF_LEN(oper));
1949 ippp = (uint32_t *) (ph + 1);
1950 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_16);
1954 *ippp = ((strmno << 16) | strmseq);
1956 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_16;
1957 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED);
1963 /* No PDAPI running */
1964 if (!TAILQ_EMPTY(&asoc->reasmqueue)) {
1966 * Reassembly queue is NOT empty validate
1967 * that this tsn does not need to be in
1968 * reasembly queue. If it does then our peer
1969 * is broken or evil.
1971 if (sctp_does_tsn_belong_to_reasm(asoc, control->sinfo_tsn)) {
1972 sctp_m_freem(control->data);
1973 control->data = NULL;
1974 if (control->whoFrom) {
1975 sctp_free_remote_addr(control->whoFrom);
1976 control->whoFrom = NULL;
1978 sctp_free_a_readq(stcb, control);
1979 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
1980 0, M_DONTWAIT, 1, MT_DATA);
1982 struct sctp_paramhdr *ph;
1985 SCTP_BUF_LEN(oper) =
1986 sizeof(struct sctp_paramhdr) +
1987 (3 * sizeof(uint32_t));
1989 struct sctp_paramhdr *);
1991 htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
1993 htons(SCTP_BUF_LEN(oper));
1994 ippp = (uint32_t *) (ph + 1);
1995 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_17);
1999 *ippp = ((strmno << 16) | strmseq);
2001 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_17;
2002 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED);
2008 /* ok, if we reach here we have passed the sanity checks */
2009 if (chunk_flags & SCTP_DATA_UNORDERED) {
2010 /* queue directly into socket buffer */
2011 sctp_mark_non_revokable(asoc, control->sinfo_tsn);
2012 sctp_add_to_readq(stcb->sctp_ep, stcb,
2014 &stcb->sctp_socket->so_rcv, 1, SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED);
2017 * Special check for when streams are resetting. We
2018 * could be more smart about this and check the
2019 * actual stream to see if it is not being reset..
2020 * that way we would not create a HOLB when amongst
2021 * streams being reset and those not being reset.
2023 * We take complete messages that have a stream reset
2024 * intervening (aka the TSN is after where our
2025 * cum-ack needs to be) off and put them on a
2026 * pending_reply_queue. The reassembly ones we do
2027 * not have to worry about since they are all sorted
2028 * and proceessed by TSN order. It is only the
2029 * singletons I must worry about.
2031 if (((liste = TAILQ_FIRST(&asoc->resetHead)) != NULL) &&
2032 SCTP_TSN_GT(tsn, liste->tsn)) {
2034 * yep its past where we need to reset... go
2035 * ahead and queue it.
2037 if (TAILQ_EMPTY(&asoc->pending_reply_queue)) {
2039 TAILQ_INSERT_TAIL(&asoc->pending_reply_queue, control, next);
2041 struct sctp_queued_to_read *ctlOn,
2043 unsigned char inserted = 0;
2045 TAILQ_FOREACH_SAFE(ctlOn, &asoc->pending_reply_queue, next, nctlOn) {
2046 if (SCTP_TSN_GT(control->sinfo_tsn, ctlOn->sinfo_tsn)) {
2050 TAILQ_INSERT_BEFORE(ctlOn, control, next);
2055 if (inserted == 0) {
2057 * must be put at end, use
2058 * prevP (all setup from
2059 * loop) to setup nextP.
2061 TAILQ_INSERT_TAIL(&asoc->pending_reply_queue, control, next);
2065 sctp_queue_data_to_stream(stcb, asoc, control, abort_flag);
2072 /* Into the re-assembly queue */
2073 sctp_queue_data_for_reasm(stcb, asoc, chk, abort_flag);
2076 * the assoc is now gone and chk was put onto the
2077 * reasm queue, which has all been freed.
2084 if (tsn == (asoc->cumulative_tsn + 1)) {
2085 /* Update cum-ack */
2086 asoc->cumulative_tsn = tsn;
2092 SCTP_STAT_INCR_COUNTER64(sctps_inorderchunks);
2094 SCTP_STAT_INCR_COUNTER64(sctps_inunorderchunks);
2096 SCTP_STAT_INCR(sctps_recvdata);
2097 /* Set it present please */
2098 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
2099 sctp_log_strm_del_alt(stcb, tsn, strmseq, strmno, SCTP_STR_LOG_FROM_MARK_TSN);
2101 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
2102 sctp_log_map(asoc->mapping_array_base_tsn, asoc->cumulative_tsn,
2103 asoc->highest_tsn_inside_map, SCTP_MAP_PREPARE_SLIDE);
2105 /* check the special flag for stream resets */
2106 if (((liste = TAILQ_FIRST(&asoc->resetHead)) != NULL) &&
2107 SCTP_TSN_GE(asoc->cumulative_tsn, liste->tsn)) {
2109 * we have finished working through the backlogged TSN's now
2110 * time to reset streams. 1: call reset function. 2: free
2111 * pending_reply space 3: distribute any chunks in
2112 * pending_reply_queue.
2114 struct sctp_queued_to_read *ctl, *nctl;
2116 sctp_reset_in_stream(stcb, liste->number_entries, liste->req.list_of_streams);
2117 TAILQ_REMOVE(&asoc->resetHead, liste, next_resp);
2118 SCTP_FREE(liste, SCTP_M_STRESET);
2119 /* sa_ignore FREED_MEMORY */
2120 liste = TAILQ_FIRST(&asoc->resetHead);
2121 if (TAILQ_EMPTY(&asoc->resetHead)) {
2122 /* All can be removed */
2123 TAILQ_FOREACH_SAFE(ctl, &asoc->pending_reply_queue, next, nctl) {
2124 TAILQ_REMOVE(&asoc->pending_reply_queue, ctl, next);
2125 sctp_queue_data_to_stream(stcb, asoc, ctl, abort_flag);
2131 TAILQ_FOREACH_SAFE(ctl, &asoc->pending_reply_queue, next, nctl) {
2132 if (SCTP_TSN_GT(ctl->sinfo_tsn, liste->tsn)) {
2136 * if ctl->sinfo_tsn is <= liste->tsn we can
2137 * process it which is the NOT of
2138 * ctl->sinfo_tsn > liste->tsn
2140 TAILQ_REMOVE(&asoc->pending_reply_queue, ctl, next);
2141 sctp_queue_data_to_stream(stcb, asoc, ctl, abort_flag);
2148 * Now service re-assembly to pick up anything that has been
2149 * held on reassembly queue?
2151 sctp_deliver_reasm_check(stcb, asoc);
2152 need_reasm_check = 0;
2154 if (need_reasm_check) {
2155 /* Another one waits ? */
2156 sctp_deliver_reasm_check(stcb, asoc);
2161 int8_t sctp_map_lookup_tab[256] = {
2162 0, 1, 0, 2, 0, 1, 0, 3,
2163 0, 1, 0, 2, 0, 1, 0, 4,
2164 0, 1, 0, 2, 0, 1, 0, 3,
2165 0, 1, 0, 2, 0, 1, 0, 5,
2166 0, 1, 0, 2, 0, 1, 0, 3,
2167 0, 1, 0, 2, 0, 1, 0, 4,
2168 0, 1, 0, 2, 0, 1, 0, 3,
2169 0, 1, 0, 2, 0, 1, 0, 6,
2170 0, 1, 0, 2, 0, 1, 0, 3,
2171 0, 1, 0, 2, 0, 1, 0, 4,
2172 0, 1, 0, 2, 0, 1, 0, 3,
2173 0, 1, 0, 2, 0, 1, 0, 5,
2174 0, 1, 0, 2, 0, 1, 0, 3,
2175 0, 1, 0, 2, 0, 1, 0, 4,
2176 0, 1, 0, 2, 0, 1, 0, 3,
2177 0, 1, 0, 2, 0, 1, 0, 7,
2178 0, 1, 0, 2, 0, 1, 0, 3,
2179 0, 1, 0, 2, 0, 1, 0, 4,
2180 0, 1, 0, 2, 0, 1, 0, 3,
2181 0, 1, 0, 2, 0, 1, 0, 5,
2182 0, 1, 0, 2, 0, 1, 0, 3,
2183 0, 1, 0, 2, 0, 1, 0, 4,
2184 0, 1, 0, 2, 0, 1, 0, 3,
2185 0, 1, 0, 2, 0, 1, 0, 6,
2186 0, 1, 0, 2, 0, 1, 0, 3,
2187 0, 1, 0, 2, 0, 1, 0, 4,
2188 0, 1, 0, 2, 0, 1, 0, 3,
2189 0, 1, 0, 2, 0, 1, 0, 5,
2190 0, 1, 0, 2, 0, 1, 0, 3,
2191 0, 1, 0, 2, 0, 1, 0, 4,
2192 0, 1, 0, 2, 0, 1, 0, 3,
2193 0, 1, 0, 2, 0, 1, 0, 8
2198 sctp_slide_mapping_arrays(struct sctp_tcb *stcb)
2201 * Now we also need to check the mapping array in a couple of ways.
2202 * 1) Did we move the cum-ack point?
2204 * When you first glance at this you might think that all entries that
2205 * make up the postion of the cum-ack would be in the nr-mapping
2206 * array only.. i.e. things up to the cum-ack are always
2207 * deliverable. Thats true with one exception, when its a fragmented
2208 * message we may not deliver the data until some threshold (or all
2209 * of it) is in place. So we must OR the nr_mapping_array and
2210 * mapping_array to get a true picture of the cum-ack.
2212 struct sctp_association *asoc;
2215 int slide_from, slide_end, lgap, distance;
2216 uint32_t old_cumack, old_base, old_highest, highest_tsn;
2220 old_cumack = asoc->cumulative_tsn;
2221 old_base = asoc->mapping_array_base_tsn;
2222 old_highest = asoc->highest_tsn_inside_map;
2224 * We could probably improve this a small bit by calculating the
2225 * offset of the current cum-ack as the starting point.
2228 for (slide_from = 0; slide_from < stcb->asoc.mapping_array_size; slide_from++) {
2229 val = asoc->nr_mapping_array[slide_from] | asoc->mapping_array[slide_from];
2233 /* there is a 0 bit */
2234 at += sctp_map_lookup_tab[val];
2238 asoc->cumulative_tsn = asoc->mapping_array_base_tsn + (at - 1);
2240 if (SCTP_TSN_GT(asoc->cumulative_tsn, asoc->highest_tsn_inside_map) &&
2241 SCTP_TSN_GT(asoc->cumulative_tsn, asoc->highest_tsn_inside_nr_map)) {
2243 panic("huh, cumack 0x%x greater than high-tsn 0x%x in map",
2244 asoc->cumulative_tsn, asoc->highest_tsn_inside_map);
2246 SCTP_PRINTF("huh, cumack 0x%x greater than high-tsn 0x%x in map - should panic?\n",
2247 asoc->cumulative_tsn, asoc->highest_tsn_inside_map);
2248 sctp_print_mapping_array(asoc);
2249 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
2250 sctp_log_map(0, 6, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
2252 asoc->highest_tsn_inside_map = asoc->cumulative_tsn;
2253 asoc->highest_tsn_inside_nr_map = asoc->cumulative_tsn;
2256 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->highest_tsn_inside_map)) {
2257 highest_tsn = asoc->highest_tsn_inside_nr_map;
2259 highest_tsn = asoc->highest_tsn_inside_map;
2261 if ((asoc->cumulative_tsn == highest_tsn) && (at >= 8)) {
2262 /* The complete array was completed by a single FR */
2263 /* highest becomes the cum-ack */
2271 /* clear the array */
2272 clr = ((at + 7) >> 3);
2273 if (clr > asoc->mapping_array_size) {
2274 clr = asoc->mapping_array_size;
2276 memset(asoc->mapping_array, 0, clr);
2277 memset(asoc->nr_mapping_array, 0, clr);
2279 for (i = 0; i < asoc->mapping_array_size; i++) {
2280 if ((asoc->mapping_array[i]) || (asoc->nr_mapping_array[i])) {
2281 SCTP_PRINTF("Error Mapping array's not clean at clear\n");
2282 sctp_print_mapping_array(asoc);
2286 asoc->mapping_array_base_tsn = asoc->cumulative_tsn + 1;
2287 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map = asoc->cumulative_tsn;
2288 } else if (at >= 8) {
2289 /* we can slide the mapping array down */
2290 /* slide_from holds where we hit the first NON 0xff byte */
2293 * now calculate the ceiling of the move using our highest
2296 SCTP_CALC_TSN_TO_GAP(lgap, highest_tsn, asoc->mapping_array_base_tsn);
2297 slide_end = (lgap >> 3);
2298 if (slide_end < slide_from) {
2299 sctp_print_mapping_array(asoc);
2301 panic("impossible slide");
2303 SCTP_PRINTF("impossible slide lgap:%x slide_end:%x slide_from:%x? at:%d\n",
2304 lgap, slide_end, slide_from, at);
2308 if (slide_end > asoc->mapping_array_size) {
2310 panic("would overrun buffer");
2312 SCTP_PRINTF("Gak, would have overrun map end:%d slide_end:%d\n",
2313 asoc->mapping_array_size, slide_end);
2314 slide_end = asoc->mapping_array_size;
2317 distance = (slide_end - slide_from) + 1;
2318 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
2319 sctp_log_map(old_base, old_cumack, old_highest,
2320 SCTP_MAP_PREPARE_SLIDE);
2321 sctp_log_map((uint32_t) slide_from, (uint32_t) slide_end,
2322 (uint32_t) lgap, SCTP_MAP_SLIDE_FROM);
2324 if (distance + slide_from > asoc->mapping_array_size ||
2327 * Here we do NOT slide forward the array so that
2328 * hopefully when more data comes in to fill it up
2329 * we will be able to slide it forward. Really I
2330 * don't think this should happen :-0
2333 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
2334 sctp_log_map((uint32_t) distance, (uint32_t) slide_from,
2335 (uint32_t) asoc->mapping_array_size,
2336 SCTP_MAP_SLIDE_NONE);
2341 for (ii = 0; ii < distance; ii++) {
2342 asoc->mapping_array[ii] = asoc->mapping_array[slide_from + ii];
2343 asoc->nr_mapping_array[ii] = asoc->nr_mapping_array[slide_from + ii];
2346 for (ii = distance; ii < asoc->mapping_array_size; ii++) {
2347 asoc->mapping_array[ii] = 0;
2348 asoc->nr_mapping_array[ii] = 0;
2350 if (asoc->highest_tsn_inside_map + 1 == asoc->mapping_array_base_tsn) {
2351 asoc->highest_tsn_inside_map += (slide_from << 3);
2353 if (asoc->highest_tsn_inside_nr_map + 1 == asoc->mapping_array_base_tsn) {
2354 asoc->highest_tsn_inside_nr_map += (slide_from << 3);
2356 asoc->mapping_array_base_tsn += (slide_from << 3);
2357 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
2358 sctp_log_map(asoc->mapping_array_base_tsn,
2359 asoc->cumulative_tsn, asoc->highest_tsn_inside_map,
2360 SCTP_MAP_SLIDE_RESULT);
2367 sctp_sack_check(struct sctp_tcb *stcb, int was_a_gap)
2369 struct sctp_association *asoc;
2370 uint32_t highest_tsn;
2373 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->highest_tsn_inside_map)) {
2374 highest_tsn = asoc->highest_tsn_inside_nr_map;
2376 highest_tsn = asoc->highest_tsn_inside_map;
2380 * Now we need to see if we need to queue a sack or just start the
2381 * timer (if allowed).
2383 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
2385 * Ok special case, in SHUTDOWN-SENT case. here we maker
2386 * sure SACK timer is off and instead send a SHUTDOWN and a
2389 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
2390 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
2391 stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_INDATA + SCTP_LOC_18);
2393 sctp_send_shutdown(stcb,
2394 ((stcb->asoc.alternate) ? stcb->asoc.alternate : stcb->asoc.primary_destination));
2395 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
2399 /* is there a gap now ? */
2400 is_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
2403 * CMT DAC algorithm: increase number of packets received
2406 stcb->asoc.cmt_dac_pkts_rcvd++;
2408 if ((stcb->asoc.send_sack == 1) || /* We need to send a
2410 ((was_a_gap) && (is_a_gap == 0)) || /* was a gap, but no
2412 (stcb->asoc.numduptsns) || /* we have dup's */
2413 (is_a_gap) || /* is still a gap */
2414 (stcb->asoc.delayed_ack == 0) || /* Delayed sack disabled */
2415 (stcb->asoc.data_pkts_seen >= stcb->asoc.sack_freq) /* hit limit of pkts */
2418 if ((stcb->asoc.sctp_cmt_on_off > 0) &&
2419 (SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) &&
2420 (stcb->asoc.send_sack == 0) &&
2421 (stcb->asoc.numduptsns == 0) &&
2422 (stcb->asoc.delayed_ack) &&
2423 (!SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer))) {
2426 * CMT DAC algorithm: With CMT, delay acks
2427 * even in the face of
2429 * reordering. Therefore, if acks that do not
2430 * have to be sent because of the above
2431 * reasons, will be delayed. That is, acks
2432 * that would have been sent due to gap
2433 * reports will be delayed with DAC. Start
2434 * the delayed ack timer.
2436 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
2437 stcb->sctp_ep, stcb, NULL);
2440 * Ok we must build a SACK since the timer
2441 * is pending, we got our first packet OR
2442 * there are gaps or duplicates.
2444 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
2445 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
2448 if (!SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
2449 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
2450 stcb->sctp_ep, stcb, NULL);
2457 sctp_service_queues(struct sctp_tcb *stcb, struct sctp_association *asoc)
2459 struct sctp_tmit_chunk *chk;
2460 uint32_t tsize, pd_point;
2463 if (asoc->fragmented_delivery_inprogress) {
2464 sctp_service_reassembly(stcb, asoc);
2466 /* Can we proceed further, i.e. the PD-API is complete */
2467 if (asoc->fragmented_delivery_inprogress) {
2472 * Now is there some other chunk I can deliver from the reassembly
2476 chk = TAILQ_FIRST(&asoc->reasmqueue);
2478 asoc->size_on_reasm_queue = 0;
2479 asoc->cnt_on_reasm_queue = 0;
2482 nxt_todel = asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered + 1;
2483 if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) &&
2484 ((nxt_todel == chk->rec.data.stream_seq) ||
2485 (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED))) {
2487 * Yep the first one is here. We setup to start reception,
2488 * by backing down the TSN just in case we can't deliver.
2492 * Before we start though either all of the message should
2493 * be here or the socket buffer max or nothing on the
2494 * delivery queue and something can be delivered.
2496 if (stcb->sctp_socket) {
2497 pd_point = min(SCTP_SB_LIMIT_RCV(stcb->sctp_socket),
2498 stcb->sctp_ep->partial_delivery_point);
2500 pd_point = stcb->sctp_ep->partial_delivery_point;
2502 if (sctp_is_all_msg_on_reasm(asoc, &tsize) || (tsize >= pd_point)) {
2503 asoc->fragmented_delivery_inprogress = 1;
2504 asoc->tsn_last_delivered = chk->rec.data.TSN_seq - 1;
2505 asoc->str_of_pdapi = chk->rec.data.stream_number;
2506 asoc->ssn_of_pdapi = chk->rec.data.stream_seq;
2507 asoc->pdapi_ppid = chk->rec.data.payloadtype;
2508 asoc->fragment_flags = chk->rec.data.rcv_flags;
2509 sctp_service_reassembly(stcb, asoc);
2510 if (asoc->fragmented_delivery_inprogress == 0) {
2518 sctp_process_data(struct mbuf **mm, int iphlen, int *offset, int length,
2519 struct sctphdr *sh, struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2520 struct sctp_nets *net, uint32_t * high_tsn)
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, sh,
2628 op_err, 0, net->port);
2631 #ifdef SCTP_AUDITING_ENABLED
2632 sctp_audit_log(0xB1, 0);
2634 if (SCTP_SIZE32(chk_length) == (length - *offset)) {
2639 if (sctp_process_a_data_chunk(stcb, asoc, mm, *offset, ch,
2640 chk_length, net, high_tsn, &abort_flag, &break_flag,
2649 * Set because of out of rwnd space and no
2650 * drop rep space left.
2656 /* not a data chunk in the data region */
2657 switch (ch->ch.chunk_type) {
2658 case SCTP_INITIATION:
2659 case SCTP_INITIATION_ACK:
2660 case SCTP_SELECTIVE_ACK:
2661 case SCTP_NR_SELECTIVE_ACK:
2662 case SCTP_HEARTBEAT_REQUEST:
2663 case SCTP_HEARTBEAT_ACK:
2664 case SCTP_ABORT_ASSOCIATION:
2666 case SCTP_SHUTDOWN_ACK:
2667 case SCTP_OPERATION_ERROR:
2668 case SCTP_COOKIE_ECHO:
2669 case SCTP_COOKIE_ACK:
2672 case SCTP_SHUTDOWN_COMPLETE:
2673 case SCTP_AUTHENTICATION:
2674 case SCTP_ASCONF_ACK:
2675 case SCTP_PACKET_DROPPED:
2676 case SCTP_STREAM_RESET:
2677 case SCTP_FORWARD_CUM_TSN:
2680 * Now, what do we do with KNOWN chunks that
2681 * are NOT in the right place?
2683 * For now, I do nothing but ignore them. We
2684 * may later want to add sysctl stuff to
2685 * switch out and do either an ABORT() or
2686 * possibly process them.
2688 if (SCTP_BASE_SYSCTL(sctp_strict_data_order)) {
2689 struct mbuf *op_err;
2691 op_err = sctp_generate_invmanparam(SCTP_CAUSE_PROTOCOL_VIOLATION);
2692 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 0, net->port);
2697 /* unknown chunk type, use bit rules */
2698 if (ch->ch.chunk_type & 0x40) {
2699 /* Add a error report to the queue */
2701 struct sctp_paramhdr *phd;
2703 merr = sctp_get_mbuf_for_msg(sizeof(*phd), 0, M_DONTWAIT, 1, MT_DATA);
2705 phd = mtod(merr, struct sctp_paramhdr *);
2707 * We cheat and use param
2708 * type since we did not
2709 * bother to define a error
2710 * cause struct. They are
2711 * the same basic format
2712 * with different names.
2715 htons(SCTP_CAUSE_UNRECOG_CHUNK);
2717 htons(chk_length + sizeof(*phd));
2718 SCTP_BUF_LEN(merr) = sizeof(*phd);
2719 SCTP_BUF_NEXT(merr) = SCTP_M_COPYM(m, *offset, chk_length, M_DONTWAIT);
2720 if (SCTP_BUF_NEXT(merr)) {
2721 if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(merr), SCTP_SIZE32(chk_length) - chk_length, NULL)) {
2724 sctp_queue_op_err(stcb, merr);
2731 if ((ch->ch.chunk_type & 0x80) == 0) {
2732 /* discard the rest of this packet */
2734 } /* else skip this bad chunk and
2737 } /* switch of chunk type */
2739 *offset += SCTP_SIZE32(chk_length);
2740 if ((*offset >= length) || stop_proc) {
2741 /* no more data left in the mbuf chain */
2745 ch = (struct sctp_data_chunk *)sctp_m_getptr(m, *offset,
2746 sizeof(struct sctp_data_chunk), (uint8_t *) & chunk_buf);
2755 * we need to report rwnd overrun drops.
2757 sctp_send_packet_dropped(stcb, net, *mm, iphlen, 0);
2761 * Did we get data, if so update the time for auto-close and
2762 * give peer credit for being alive.
2764 SCTP_STAT_INCR(sctps_recvpktwithdata);
2765 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
2766 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
2767 stcb->asoc.overall_error_count,
2769 SCTP_FROM_SCTP_INDATA,
2772 stcb->asoc.overall_error_count = 0;
2773 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_last_rcvd);
2775 /* now service all of the reassm queue if needed */
2776 if (!(TAILQ_EMPTY(&asoc->reasmqueue)))
2777 sctp_service_queues(stcb, asoc);
2779 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
2780 /* Assure that we ack right away */
2781 stcb->asoc.send_sack = 1;
2783 /* Start a sack timer or QUEUE a SACK for sending */
2784 sctp_sack_check(stcb, was_a_gap);
2789 sctp_process_segment_range(struct sctp_tcb *stcb, struct sctp_tmit_chunk **p_tp1, uint32_t last_tsn,
2790 uint16_t frag_strt, uint16_t frag_end, int nr_sacking,
2792 uint32_t * biggest_newly_acked_tsn,
2793 uint32_t * this_sack_lowest_newack,
2796 struct sctp_tmit_chunk *tp1;
2797 unsigned int theTSN;
2798 int j, wake_him = 0, circled = 0;
2800 /* Recover the tp1 we last saw */
2803 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue);
2805 for (j = frag_strt; j <= frag_end; j++) {
2806 theTSN = j + last_tsn;
2808 if (tp1->rec.data.doing_fast_retransmit)
2812 * CMT: CUCv2 algorithm. For each TSN being
2813 * processed from the sent queue, track the
2814 * next expected pseudo-cumack, or
2815 * rtx_pseudo_cumack, if required. Separate
2816 * cumack trackers for first transmissions,
2817 * and retransmissions.
2819 if ((tp1->whoTo->find_pseudo_cumack == 1) && (tp1->sent < SCTP_DATAGRAM_RESEND) &&
2820 (tp1->snd_count == 1)) {
2821 tp1->whoTo->pseudo_cumack = tp1->rec.data.TSN_seq;
2822 tp1->whoTo->find_pseudo_cumack = 0;
2824 if ((tp1->whoTo->find_rtx_pseudo_cumack == 1) && (tp1->sent < SCTP_DATAGRAM_RESEND) &&
2825 (tp1->snd_count > 1)) {
2826 tp1->whoTo->rtx_pseudo_cumack = tp1->rec.data.TSN_seq;
2827 tp1->whoTo->find_rtx_pseudo_cumack = 0;
2829 if (tp1->rec.data.TSN_seq == theTSN) {
2830 if (tp1->sent != SCTP_DATAGRAM_UNSENT) {
2832 * must be held until
2835 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
2837 * If it is less than RESEND, it is
2838 * now no-longer in flight.
2839 * Higher values may already be set
2840 * via previous Gap Ack Blocks...
2841 * i.e. ACKED or RESEND.
2843 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq,
2844 *biggest_newly_acked_tsn)) {
2845 *biggest_newly_acked_tsn = tp1->rec.data.TSN_seq;
2848 * CMT: SFR algo (and HTNA) - set
2849 * saw_newack to 1 for dest being
2850 * newly acked. update
2851 * this_sack_highest_newack if
2854 if (tp1->rec.data.chunk_was_revoked == 0)
2855 tp1->whoTo->saw_newack = 1;
2857 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq,
2858 tp1->whoTo->this_sack_highest_newack)) {
2859 tp1->whoTo->this_sack_highest_newack =
2860 tp1->rec.data.TSN_seq;
2863 * CMT DAC algo: also update
2864 * this_sack_lowest_newack
2866 if (*this_sack_lowest_newack == 0) {
2867 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
2868 sctp_log_sack(*this_sack_lowest_newack,
2870 tp1->rec.data.TSN_seq,
2873 SCTP_LOG_TSN_ACKED);
2875 *this_sack_lowest_newack = tp1->rec.data.TSN_seq;
2878 * CMT: CUCv2 algorithm. If (rtx-)pseudo-cumack for corresp
2879 * dest is being acked, then we have a new (rtx-)pseudo-cumack. Set
2880 * new_(rtx_)pseudo_cumack to TRUE so that the cwnd for this dest can be
2881 * updated. Also trigger search for the next expected (rtx-)pseudo-cumack.
2882 * Separate pseudo_cumack trackers for first transmissions and
2885 if (tp1->rec.data.TSN_seq == tp1->whoTo->pseudo_cumack) {
2886 if (tp1->rec.data.chunk_was_revoked == 0) {
2887 tp1->whoTo->new_pseudo_cumack = 1;
2889 tp1->whoTo->find_pseudo_cumack = 1;
2891 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
2892 sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK);
2894 if (tp1->rec.data.TSN_seq == tp1->whoTo->rtx_pseudo_cumack) {
2895 if (tp1->rec.data.chunk_was_revoked == 0) {
2896 tp1->whoTo->new_pseudo_cumack = 1;
2898 tp1->whoTo->find_rtx_pseudo_cumack = 1;
2900 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
2901 sctp_log_sack(*biggest_newly_acked_tsn,
2903 tp1->rec.data.TSN_seq,
2906 SCTP_LOG_TSN_ACKED);
2908 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
2909 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_GAP,
2910 tp1->whoTo->flight_size,
2912 (uintptr_t) tp1->whoTo,
2913 tp1->rec.data.TSN_seq);
2915 sctp_flight_size_decrease(tp1);
2916 if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) {
2917 (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo,
2920 sctp_total_flight_decrease(stcb, tp1);
2922 tp1->whoTo->net_ack += tp1->send_size;
2923 if (tp1->snd_count < 2) {
2925 * True non-retransmited chunk
2927 tp1->whoTo->net_ack2 += tp1->send_size;
2935 sctp_calculate_rto(stcb,
2938 &tp1->sent_rcv_time,
2939 sctp_align_safe_nocopy,
2940 SCTP_RTT_FROM_DATA);
2943 if (tp1->whoTo->rto_needed == 0) {
2944 tp1->whoTo->rto_needed = 1;
2950 if (tp1->sent <= SCTP_DATAGRAM_RESEND) {
2951 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq,
2952 stcb->asoc.this_sack_highest_gap)) {
2953 stcb->asoc.this_sack_highest_gap =
2954 tp1->rec.data.TSN_seq;
2956 if (tp1->sent == SCTP_DATAGRAM_RESEND) {
2957 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
2958 #ifdef SCTP_AUDITING_ENABLED
2959 sctp_audit_log(0xB2,
2960 (stcb->asoc.sent_queue_retran_cnt & 0x000000ff));
2965 * All chunks NOT UNSENT fall through here and are marked
2966 * (leave PR-SCTP ones that are to skip alone though)
2968 if (tp1->sent != SCTP_FORWARD_TSN_SKIP)
2969 tp1->sent = SCTP_DATAGRAM_MARKED;
2971 if (tp1->rec.data.chunk_was_revoked) {
2972 /* deflate the cwnd */
2973 tp1->whoTo->cwnd -= tp1->book_size;
2974 tp1->rec.data.chunk_was_revoked = 0;
2976 /* NR Sack code here */
2983 sctp_free_bufspace(stcb, &stcb->asoc, tp1, 1);
2984 sctp_m_freem(tp1->data);
2991 } /* if (tp1->TSN_seq == theTSN) */
2992 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, theTSN)) {
2995 tp1 = TAILQ_NEXT(tp1, sctp_next);
2996 if ((tp1 == NULL) && (circled == 0)) {
2998 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue);
3000 } /* end while (tp1) */
3003 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue);
3005 /* In case the fragments were not in order we must reset */
3006 } /* end for (j = fragStart */
3008 return (wake_him); /* Return value only used for nr-sack */
3013 sctp_handle_segments(struct mbuf *m, int *offset, struct sctp_tcb *stcb, struct sctp_association *asoc,
3014 uint32_t last_tsn, uint32_t * biggest_tsn_acked,
3015 uint32_t * biggest_newly_acked_tsn, uint32_t * this_sack_lowest_newack,
3016 int num_seg, int num_nr_seg, int *rto_ok)
3018 struct sctp_gap_ack_block *frag, block;
3019 struct sctp_tmit_chunk *tp1;
3024 uint16_t frag_strt, frag_end, prev_frag_end;
3026 tp1 = TAILQ_FIRST(&asoc->sent_queue);
3030 for (i = 0; i < (num_seg + num_nr_seg); i++) {
3033 tp1 = TAILQ_FIRST(&asoc->sent_queue);
3035 frag = (struct sctp_gap_ack_block *)sctp_m_getptr(m, *offset,
3036 sizeof(struct sctp_gap_ack_block), (uint8_t *) & block);
3037 *offset += sizeof(block);
3039 return (chunk_freed);
3041 frag_strt = ntohs(frag->start);
3042 frag_end = ntohs(frag->end);
3044 if (frag_strt > frag_end) {
3045 /* This gap report is malformed, skip it. */
3048 if (frag_strt <= prev_frag_end) {
3049 /* This gap report is not in order, so restart. */
3050 tp1 = TAILQ_FIRST(&asoc->sent_queue);
3052 if (SCTP_TSN_GT((last_tsn + frag_end), *biggest_tsn_acked)) {
3053 *biggest_tsn_acked = last_tsn + frag_end;
3060 if (sctp_process_segment_range(stcb, &tp1, last_tsn, frag_strt, frag_end,
3061 non_revocable, &num_frs, biggest_newly_acked_tsn,
3062 this_sack_lowest_newack, rto_ok)) {
3065 prev_frag_end = frag_end;
3067 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
3069 sctp_log_fr(*biggest_tsn_acked,
3070 *biggest_newly_acked_tsn,
3071 last_tsn, SCTP_FR_LOG_BIGGEST_TSNS);
3073 return (chunk_freed);
3077 sctp_check_for_revoked(struct sctp_tcb *stcb,
3078 struct sctp_association *asoc, uint32_t cumack,
3079 uint32_t biggest_tsn_acked)
3081 struct sctp_tmit_chunk *tp1;
3082 int tot_revoked = 0;
3084 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
3085 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, cumack)) {
3087 * ok this guy is either ACK or MARKED. If it is
3088 * ACKED it has been previously acked but not this
3089 * time i.e. revoked. If it is MARKED it was ACK'ed
3092 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, biggest_tsn_acked)) {
3095 if (tp1->sent == SCTP_DATAGRAM_ACKED) {
3096 /* it has been revoked */
3097 tp1->sent = SCTP_DATAGRAM_SENT;
3098 tp1->rec.data.chunk_was_revoked = 1;
3100 * We must add this stuff back in to assure
3101 * timers and such get started.
3103 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3104 sctp_misc_ints(SCTP_FLIGHT_LOG_UP_REVOKE,
3105 tp1->whoTo->flight_size,
3107 (uintptr_t) tp1->whoTo,
3108 tp1->rec.data.TSN_seq);
3110 sctp_flight_size_increase(tp1);
3111 sctp_total_flight_increase(stcb, tp1);
3113 * We inflate the cwnd to compensate for our
3114 * artificial inflation of the flight_size.
3116 tp1->whoTo->cwnd += tp1->book_size;
3118 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
3119 sctp_log_sack(asoc->last_acked_seq,
3121 tp1->rec.data.TSN_seq,
3124 SCTP_LOG_TSN_REVOKED);
3126 } else if (tp1->sent == SCTP_DATAGRAM_MARKED) {
3127 /* it has been re-acked in this SACK */
3128 tp1->sent = SCTP_DATAGRAM_ACKED;
3131 if (tp1->sent == SCTP_DATAGRAM_UNSENT)
3138 sctp_strike_gap_ack_chunks(struct sctp_tcb *stcb, struct sctp_association *asoc,
3139 uint32_t biggest_tsn_acked, uint32_t biggest_tsn_newly_acked, uint32_t this_sack_lowest_newack, int accum_moved)
3141 struct sctp_tmit_chunk *tp1;
3142 int strike_flag = 0;
3144 int tot_retrans = 0;
3145 uint32_t sending_seq;
3146 struct sctp_nets *net;
3147 int num_dests_sacked = 0;
3150 * select the sending_seq, this is either the next thing ready to be
3151 * sent but not transmitted, OR, the next seq we assign.
3153 tp1 = TAILQ_FIRST(&stcb->asoc.send_queue);
3155 sending_seq = asoc->sending_seq;
3157 sending_seq = tp1->rec.data.TSN_seq;
3160 /* CMT DAC algo: finding out if SACK is a mixed SACK */
3161 if ((asoc->sctp_cmt_on_off > 0) &&
3162 SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
3163 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
3164 if (net->saw_newack)
3168 if (stcb->asoc.peer_supports_prsctp) {
3169 (void)SCTP_GETTIME_TIMEVAL(&now);
3171 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
3173 if (tp1->no_fr_allowed) {
3174 /* this one had a timeout or something */
3177 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
3178 if (tp1->sent < SCTP_DATAGRAM_RESEND)
3179 sctp_log_fr(biggest_tsn_newly_acked,
3180 tp1->rec.data.TSN_seq,
3182 SCTP_FR_LOG_CHECK_STRIKE);
3184 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, biggest_tsn_acked) ||
3185 tp1->sent == SCTP_DATAGRAM_UNSENT) {
3189 if (stcb->asoc.peer_supports_prsctp) {
3190 if ((PR_SCTP_TTL_ENABLED(tp1->flags)) && tp1->sent < SCTP_DATAGRAM_ACKED) {
3191 /* Is it expired? */
3192 if (timevalcmp(&now, &tp1->rec.data.timetodrop, >)) {
3193 /* Yes so drop it */
3194 if (tp1->data != NULL) {
3195 (void)sctp_release_pr_sctp_chunk(stcb, tp1, 1,
3196 SCTP_SO_NOT_LOCKED);
3202 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, asoc->this_sack_highest_gap)) {
3203 /* we are beyond the tsn in the sack */
3206 if (tp1->sent >= SCTP_DATAGRAM_RESEND) {
3207 /* either a RESEND, ACKED, or MARKED */
3209 if (tp1->sent == SCTP_FORWARD_TSN_SKIP) {
3210 /* Continue strikin FWD-TSN chunks */
3211 tp1->rec.data.fwd_tsn_cnt++;
3216 * CMT : SFR algo (covers part of DAC and HTNA as well)
3218 if (tp1->whoTo && tp1->whoTo->saw_newack == 0) {
3220 * No new acks were receieved for data sent to this
3221 * dest. Therefore, according to the SFR algo for
3222 * CMT, no data sent to this dest can be marked for
3223 * FR using this SACK.
3226 } else if (tp1->whoTo && SCTP_TSN_GT(tp1->rec.data.TSN_seq,
3227 tp1->whoTo->this_sack_highest_newack)) {
3229 * CMT: New acks were receieved for data sent to
3230 * this dest. But no new acks were seen for data
3231 * sent after tp1. Therefore, according to the SFR
3232 * algo for CMT, tp1 cannot be marked for FR using
3233 * this SACK. This step covers part of the DAC algo
3234 * and the HTNA algo as well.
3239 * Here we check to see if we were have already done a FR
3240 * and if so we see if the biggest TSN we saw in the sack is
3241 * smaller than the recovery point. If so we don't strike
3242 * the tsn... otherwise we CAN strike the TSN.
3245 * @@@ JRI: Check for CMT if (accum_moved &&
3246 * asoc->fast_retran_loss_recovery && (sctp_cmt_on_off ==
3249 if (accum_moved && asoc->fast_retran_loss_recovery) {
3251 * Strike the TSN if in fast-recovery and cum-ack
3254 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
3255 sctp_log_fr(biggest_tsn_newly_acked,
3256 tp1->rec.data.TSN_seq,
3258 SCTP_FR_LOG_STRIKE_CHUNK);
3260 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3263 if ((asoc->sctp_cmt_on_off > 0) &&
3264 SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
3266 * CMT DAC algorithm: If SACK flag is set to
3267 * 0, then lowest_newack test will not pass
3268 * because it would have been set to the
3269 * cumack earlier. If not already to be
3270 * rtx'd, If not a mixed sack and if tp1 is
3271 * not between two sacked TSNs, then mark by
3272 * one more. NOTE that we are marking by one
3273 * additional time since the SACK DAC flag
3274 * indicates that two packets have been
3275 * received after this missing TSN.
3277 if ((tp1->sent < SCTP_DATAGRAM_RESEND) && (num_dests_sacked == 1) &&
3278 SCTP_TSN_GT(this_sack_lowest_newack, tp1->rec.data.TSN_seq)) {
3279 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
3280 sctp_log_fr(16 + num_dests_sacked,
3281 tp1->rec.data.TSN_seq,
3283 SCTP_FR_LOG_STRIKE_CHUNK);
3288 } else if ((tp1->rec.data.doing_fast_retransmit) &&
3289 (asoc->sctp_cmt_on_off == 0)) {
3291 * For those that have done a FR we must take
3292 * special consideration if we strike. I.e the
3293 * biggest_newly_acked must be higher than the
3294 * sending_seq at the time we did the FR.
3297 #ifdef SCTP_FR_TO_ALTERNATE
3299 * If FR's go to new networks, then we must only do
3300 * this for singly homed asoc's. However if the FR's
3301 * go to the same network (Armando's work) then its
3302 * ok to FR multiple times.
3310 if (SCTP_TSN_GE(biggest_tsn_newly_acked,
3311 tp1->rec.data.fast_retran_tsn)) {
3313 * Strike the TSN, since this ack is
3314 * beyond where things were when we
3317 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
3318 sctp_log_fr(biggest_tsn_newly_acked,
3319 tp1->rec.data.TSN_seq,
3321 SCTP_FR_LOG_STRIKE_CHUNK);
3323 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3327 if ((asoc->sctp_cmt_on_off > 0) &&
3328 SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
3330 * CMT DAC algorithm: If
3331 * SACK flag is set to 0,
3332 * then lowest_newack test
3333 * will not pass because it
3334 * would have been set to
3335 * the cumack earlier. If
3336 * not already to be rtx'd,
3337 * If not a mixed sack and
3338 * if tp1 is not between two
3339 * sacked TSNs, then mark by
3340 * one more. NOTE that we
3341 * are marking by one
3342 * additional time since the
3343 * SACK DAC flag indicates
3344 * that two packets have
3345 * been received after this
3348 if ((tp1->sent < SCTP_DATAGRAM_RESEND) &&
3349 (num_dests_sacked == 1) &&
3350 SCTP_TSN_GT(this_sack_lowest_newack,
3351 tp1->rec.data.TSN_seq)) {
3352 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
3353 sctp_log_fr(32 + num_dests_sacked,
3354 tp1->rec.data.TSN_seq,
3356 SCTP_FR_LOG_STRIKE_CHUNK);
3358 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3366 * JRI: TODO: remove code for HTNA algo. CMT's SFR
3369 } else if (SCTP_TSN_GT(tp1->rec.data.TSN_seq,
3370 biggest_tsn_newly_acked)) {
3372 * We don't strike these: This is the HTNA
3373 * algorithm i.e. we don't strike If our TSN is
3374 * larger than the Highest TSN Newly Acked.
3378 /* Strike the TSN */
3379 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
3380 sctp_log_fr(biggest_tsn_newly_acked,
3381 tp1->rec.data.TSN_seq,
3383 SCTP_FR_LOG_STRIKE_CHUNK);
3385 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3388 if ((asoc->sctp_cmt_on_off > 0) &&
3389 SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
3391 * CMT DAC algorithm: If SACK flag is set to
3392 * 0, then lowest_newack test will not pass
3393 * because it would have been set to the
3394 * cumack earlier. If not already to be
3395 * rtx'd, If not a mixed sack and if tp1 is
3396 * not between two sacked TSNs, then mark by
3397 * one more. NOTE that we are marking by one
3398 * additional time since the SACK DAC flag
3399 * indicates that two packets have been
3400 * received after this missing TSN.
3402 if ((tp1->sent < SCTP_DATAGRAM_RESEND) && (num_dests_sacked == 1) &&
3403 SCTP_TSN_GT(this_sack_lowest_newack, tp1->rec.data.TSN_seq)) {
3404 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
3405 sctp_log_fr(48 + num_dests_sacked,
3406 tp1->rec.data.TSN_seq,
3408 SCTP_FR_LOG_STRIKE_CHUNK);
3414 if (tp1->sent == SCTP_DATAGRAM_RESEND) {
3415 struct sctp_nets *alt;
3417 /* fix counts and things */
3418 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3419 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_RSND,
3420 (tp1->whoTo ? (tp1->whoTo->flight_size) : 0),
3422 (uintptr_t) tp1->whoTo,
3423 tp1->rec.data.TSN_seq);
3426 tp1->whoTo->net_ack++;
3427 sctp_flight_size_decrease(tp1);
3428 if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) {
3429 (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo,
3433 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
3434 sctp_log_rwnd(SCTP_INCREASE_PEER_RWND,
3435 asoc->peers_rwnd, tp1->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
3437 /* add back to the rwnd */
3438 asoc->peers_rwnd += (tp1->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
3440 /* remove from the total flight */
3441 sctp_total_flight_decrease(stcb, tp1);
3443 if ((stcb->asoc.peer_supports_prsctp) &&
3444 (PR_SCTP_RTX_ENABLED(tp1->flags))) {
3446 * Has it been retransmitted tv_sec times? -
3447 * we store the retran count there.
3449 if (tp1->snd_count > tp1->rec.data.timetodrop.tv_sec) {
3450 /* Yes, so drop it */
3451 if (tp1->data != NULL) {
3452 (void)sctp_release_pr_sctp_chunk(stcb, tp1, 1,
3453 SCTP_SO_NOT_LOCKED);
3455 /* Make sure to flag we had a FR */
3456 tp1->whoTo->net_ack++;
3461 * SCTP_PRINTF("OK, we are now ready to FR this
3464 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
3465 sctp_log_fr(tp1->rec.data.TSN_seq, tp1->snd_count,
3469 /* This is a subsequent FR */
3470 SCTP_STAT_INCR(sctps_sendmultfastretrans);
3472 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3473 if (asoc->sctp_cmt_on_off > 0) {
3475 * CMT: Using RTX_SSTHRESH policy for CMT.
3476 * If CMT is being used, then pick dest with
3477 * largest ssthresh for any retransmission.
3479 tp1->no_fr_allowed = 1;
3481 /* sa_ignore NO_NULL_CHK */
3482 if (asoc->sctp_cmt_pf > 0) {
3484 * JRS 5/18/07 - If CMT PF is on,
3485 * use the PF version of
3488 alt = sctp_find_alternate_net(stcb, alt, 2);
3491 * JRS 5/18/07 - If only CMT is on,
3492 * use the CMT version of
3495 /* sa_ignore NO_NULL_CHK */
3496 alt = sctp_find_alternate_net(stcb, alt, 1);
3502 * CUCv2: If a different dest is picked for
3503 * the retransmission, then new
3504 * (rtx-)pseudo_cumack needs to be tracked
3505 * for orig dest. Let CUCv2 track new (rtx-)
3506 * pseudo-cumack always.
3509 tp1->whoTo->find_pseudo_cumack = 1;
3510 tp1->whoTo->find_rtx_pseudo_cumack = 1;
3512 } else {/* CMT is OFF */
3514 #ifdef SCTP_FR_TO_ALTERNATE
3515 /* Can we find an alternate? */
3516 alt = sctp_find_alternate_net(stcb, tp1->whoTo, 0);
3519 * default behavior is to NOT retransmit
3520 * FR's to an alternate. Armando Caro's
3521 * paper details why.
3527 tp1->rec.data.doing_fast_retransmit = 1;
3529 /* mark the sending seq for possible subsequent FR's */
3531 * SCTP_PRINTF("Marking TSN for FR new value %x\n",
3532 * (uint32_t)tpi->rec.data.TSN_seq);
3534 if (TAILQ_EMPTY(&asoc->send_queue)) {
3536 * If the queue of send is empty then its
3537 * the next sequence number that will be
3538 * assigned so we subtract one from this to
3539 * get the one we last sent.
3541 tp1->rec.data.fast_retran_tsn = sending_seq;
3544 * If there are chunks on the send queue
3545 * (unsent data that has made it from the
3546 * stream queues but not out the door, we
3547 * take the first one (which will have the
3548 * lowest TSN) and subtract one to get the
3551 struct sctp_tmit_chunk *ttt;
3553 ttt = TAILQ_FIRST(&asoc->send_queue);
3554 tp1->rec.data.fast_retran_tsn =
3555 ttt->rec.data.TSN_seq;
3560 * this guy had a RTO calculation pending on
3563 if ((tp1->whoTo != NULL) &&
3564 (tp1->whoTo->rto_needed == 0)) {
3565 tp1->whoTo->rto_needed = 1;
3569 if (alt != tp1->whoTo) {
3570 /* yes, there is an alternate. */
3571 sctp_free_remote_addr(tp1->whoTo);
3572 /* sa_ignore FREED_MEMORY */
3574 atomic_add_int(&alt->ref_count, 1);
3580 struct sctp_tmit_chunk *
3581 sctp_try_advance_peer_ack_point(struct sctp_tcb *stcb,
3582 struct sctp_association *asoc)
3584 struct sctp_tmit_chunk *tp1, *tp2, *a_adv = NULL;
3588 if (asoc->peer_supports_prsctp == 0) {
3591 TAILQ_FOREACH_SAFE(tp1, &asoc->sent_queue, sctp_next, tp2) {
3592 if (tp1->sent != SCTP_FORWARD_TSN_SKIP &&
3593 tp1->sent != SCTP_DATAGRAM_RESEND) {
3594 /* no chance to advance, out of here */
3597 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
3598 if (tp1->sent == SCTP_FORWARD_TSN_SKIP) {
3599 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
3600 asoc->advanced_peer_ack_point,
3601 tp1->rec.data.TSN_seq, 0, 0);
3604 if (!PR_SCTP_ENABLED(tp1->flags)) {
3606 * We can't fwd-tsn past any that are reliable aka
3607 * retransmitted until the asoc fails.
3612 (void)SCTP_GETTIME_TIMEVAL(&now);
3616 * now we got a chunk which is marked for another
3617 * retransmission to a PR-stream but has run out its chances
3618 * already maybe OR has been marked to skip now. Can we skip
3619 * it if its a resend?
3621 if (tp1->sent == SCTP_DATAGRAM_RESEND &&
3622 (PR_SCTP_TTL_ENABLED(tp1->flags))) {
3624 * Now is this one marked for resend and its time is
3627 if (timevalcmp(&now, &tp1->rec.data.timetodrop, >)) {
3628 /* Yes so drop it */
3630 (void)sctp_release_pr_sctp_chunk(stcb, tp1,
3631 1, SCTP_SO_NOT_LOCKED);
3635 * No, we are done when hit one for resend
3636 * whos time as not expired.
3642 * Ok now if this chunk is marked to drop it we can clean up
3643 * the chunk, advance our peer ack point and we can check
3646 if (tp1->sent == SCTP_FORWARD_TSN_SKIP) {
3647 /* advance PeerAckPoint goes forward */
3648 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, asoc->advanced_peer_ack_point)) {
3649 asoc->advanced_peer_ack_point = tp1->rec.data.TSN_seq;
3651 } else if (tp1->rec.data.TSN_seq == asoc->advanced_peer_ack_point) {
3652 /* No update but we do save the chk */
3657 * If it is still in RESEND we can advance no
3667 sctp_fs_audit(struct sctp_association *asoc)
3669 struct sctp_tmit_chunk *chk;
3670 int inflight = 0, resend = 0, inbetween = 0, acked = 0, above = 0;
3671 int entry_flight, entry_cnt, ret;
3673 entry_flight = asoc->total_flight;
3674 entry_cnt = asoc->total_flight_count;
3677 if (asoc->pr_sctp_cnt >= asoc->sent_queue_cnt)
3680 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
3681 if (chk->sent < SCTP_DATAGRAM_RESEND) {
3682 SCTP_PRINTF("Chk TSN:%u size:%d inflight cnt:%d\n",
3683 chk->rec.data.TSN_seq,
3687 } else if (chk->sent == SCTP_DATAGRAM_RESEND) {
3689 } else if (chk->sent < SCTP_DATAGRAM_ACKED) {
3691 } else if (chk->sent > SCTP_DATAGRAM_ACKED) {
3698 if ((inflight > 0) || (inbetween > 0)) {
3700 panic("Flight size-express incorrect? \n");
3702 SCTP_PRINTF("asoc->total_flight:%d cnt:%d\n",
3703 entry_flight, entry_cnt);
3705 SCTP_PRINTF("Flight size-express incorrect F:%d I:%d R:%d Ab:%d ACK:%d\n",
3706 inflight, inbetween, resend, above, acked);
3715 sctp_window_probe_recovery(struct sctp_tcb *stcb,
3716 struct sctp_association *asoc,
3717 struct sctp_tmit_chunk *tp1)
3719 tp1->window_probe = 0;
3720 if ((tp1->sent >= SCTP_DATAGRAM_ACKED) || (tp1->data == NULL)) {
3721 /* TSN's skipped we do NOT move back. */
3722 sctp_misc_ints(SCTP_FLIGHT_LOG_DWN_WP_FWD,
3723 tp1->whoTo->flight_size,
3725 (uintptr_t) tp1->whoTo,
3726 tp1->rec.data.TSN_seq);
3729 /* First setup this by shrinking flight */
3730 if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) {
3731 (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo,
3734 sctp_flight_size_decrease(tp1);
3735 sctp_total_flight_decrease(stcb, tp1);
3736 /* Now mark for resend */
3737 tp1->sent = SCTP_DATAGRAM_RESEND;
3738 sctp_ucount_incr(asoc->sent_queue_retran_cnt);
3740 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3741 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_WP,
3742 tp1->whoTo->flight_size,
3744 (uintptr_t) tp1->whoTo,
3745 tp1->rec.data.TSN_seq);
3750 sctp_express_handle_sack(struct sctp_tcb *stcb, uint32_t cumack,
3751 uint32_t rwnd, int *abort_now, int ecne_seen)
3753 struct sctp_nets *net;
3754 struct sctp_association *asoc;
3755 struct sctp_tmit_chunk *tp1, *tp2;
3757 int win_probe_recovery = 0;
3758 int win_probe_recovered = 0;
3759 int j, done_once = 0;
3762 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_SACK_ARRIVALS_ENABLE) {
3763 sctp_misc_ints(SCTP_SACK_LOG_EXPRESS, cumack,
3764 rwnd, stcb->asoc.last_acked_seq, stcb->asoc.peers_rwnd);
3766 SCTP_TCB_LOCK_ASSERT(stcb);
3767 #ifdef SCTP_ASOCLOG_OF_TSNS
3768 stcb->asoc.cumack_log[stcb->asoc.cumack_log_at] = cumack;
3769 stcb->asoc.cumack_log_at++;
3770 if (stcb->asoc.cumack_log_at > SCTP_TSN_LOG_SIZE) {
3771 stcb->asoc.cumack_log_at = 0;
3775 old_rwnd = asoc->peers_rwnd;
3776 if (SCTP_TSN_GT(asoc->last_acked_seq, cumack)) {
3779 } else if (asoc->last_acked_seq == cumack) {
3780 /* Window update sack */
3781 asoc->peers_rwnd = sctp_sbspace_sub(rwnd,
3782 (uint32_t) (asoc->total_flight + (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh))));
3783 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
3784 /* SWS sender side engages */
3785 asoc->peers_rwnd = 0;
3787 if (asoc->peers_rwnd > old_rwnd) {
3792 /* First setup for CC stuff */
3793 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
3794 if (SCTP_TSN_GT(cumack, net->cwr_window_tsn)) {
3795 /* Drag along the window_tsn for cwr's */
3796 net->cwr_window_tsn = cumack;
3798 net->prev_cwnd = net->cwnd;
3803 * CMT: Reset CUC and Fast recovery algo variables before
3806 net->new_pseudo_cumack = 0;
3807 net->will_exit_fast_recovery = 0;
3808 if (stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack) {
3809 (*stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack) (stcb, net);
3812 if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) {
3815 if (!TAILQ_EMPTY(&asoc->sent_queue)) {
3816 tp1 = TAILQ_LAST(&asoc->sent_queue,
3817 sctpchunk_listhead);
3818 send_s = tp1->rec.data.TSN_seq + 1;
3820 send_s = asoc->sending_seq;
3822 if (SCTP_TSN_GE(cumack, send_s)) {
3828 panic("Impossible sack 1");
3833 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)),
3834 0, M_DONTWAIT, 1, MT_DATA);
3836 struct sctp_paramhdr *ph;
3839 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
3841 ph = mtod(oper, struct sctp_paramhdr *);
3842 ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
3843 ph->param_length = htons(SCTP_BUF_LEN(oper));
3844 ippp = (uint32_t *) (ph + 1);
3845 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_25);
3847 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_25;
3848 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED);
3853 asoc->this_sack_highest_gap = cumack;
3854 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
3855 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
3856 stcb->asoc.overall_error_count,
3858 SCTP_FROM_SCTP_INDATA,
3861 stcb->asoc.overall_error_count = 0;
3862 if (SCTP_TSN_GT(cumack, asoc->last_acked_seq)) {
3863 /* process the new consecutive TSN first */
3864 TAILQ_FOREACH_SAFE(tp1, &asoc->sent_queue, sctp_next, tp2) {
3865 if (SCTP_TSN_GE(cumack, tp1->rec.data.TSN_seq)) {
3866 if (tp1->sent == SCTP_DATAGRAM_UNSENT) {
3867 SCTP_PRINTF("Warning, an unsent is now acked?\n");
3869 if (tp1->sent < SCTP_DATAGRAM_ACKED) {
3871 * If it is less than ACKED, it is
3872 * now no-longer in flight. Higher
3873 * values may occur during marking
3875 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3876 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3877 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_CA,
3878 tp1->whoTo->flight_size,
3880 (uintptr_t) tp1->whoTo,
3881 tp1->rec.data.TSN_seq);
3883 sctp_flight_size_decrease(tp1);
3884 if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) {
3885 (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo,
3888 /* sa_ignore NO_NULL_CHK */
3889 sctp_total_flight_decrease(stcb, tp1);
3891 tp1->whoTo->net_ack += tp1->send_size;
3892 if (tp1->snd_count < 2) {
3894 * True non-retransmited
3897 tp1->whoTo->net_ack2 +=
3900 /* update RTO too? */
3909 sctp_calculate_rto(stcb,
3911 &tp1->sent_rcv_time,
3912 sctp_align_safe_nocopy,
3913 SCTP_RTT_FROM_DATA);
3916 if (tp1->whoTo->rto_needed == 0) {
3917 tp1->whoTo->rto_needed = 1;
3923 * CMT: CUCv2 algorithm. From the
3924 * cumack'd TSNs, for each TSN being
3925 * acked for the first time, set the
3926 * following variables for the
3927 * corresp destination.
3928 * new_pseudo_cumack will trigger a
3930 * find_(rtx_)pseudo_cumack will
3931 * trigger search for the next
3932 * expected (rtx-)pseudo-cumack.
3934 tp1->whoTo->new_pseudo_cumack = 1;
3935 tp1->whoTo->find_pseudo_cumack = 1;
3936 tp1->whoTo->find_rtx_pseudo_cumack = 1;
3938 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
3939 /* sa_ignore NO_NULL_CHK */
3940 sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK);
3943 if (tp1->sent == SCTP_DATAGRAM_RESEND) {
3944 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
3946 if (tp1->rec.data.chunk_was_revoked) {
3947 /* deflate the cwnd */
3948 tp1->whoTo->cwnd -= tp1->book_size;
3949 tp1->rec.data.chunk_was_revoked = 0;
3951 tp1->sent = SCTP_DATAGRAM_ACKED;
3952 TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next);
3954 /* sa_ignore NO_NULL_CHK */
3955 sctp_free_bufspace(stcb, asoc, tp1, 1);
3956 sctp_m_freem(tp1->data);
3959 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
3960 sctp_log_sack(asoc->last_acked_seq,
3962 tp1->rec.data.TSN_seq,
3965 SCTP_LOG_FREE_SENT);
3967 asoc->sent_queue_cnt--;
3968 sctp_free_a_chunk(stcb, tp1, SCTP_SO_NOT_LOCKED);
3975 /* sa_ignore NO_NULL_CHK */
3976 if (stcb->sctp_socket) {
3977 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3981 SOCKBUF_LOCK(&stcb->sctp_socket->so_snd);
3982 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) {
3983 /* sa_ignore NO_NULL_CHK */
3984 sctp_wakeup_log(stcb, 1, SCTP_WAKESND_FROM_SACK);
3986 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3987 so = SCTP_INP_SO(stcb->sctp_ep);
3988 atomic_add_int(&stcb->asoc.refcnt, 1);
3989 SCTP_TCB_UNLOCK(stcb);
3990 SCTP_SOCKET_LOCK(so, 1);
3991 SCTP_TCB_LOCK(stcb);
3992 atomic_subtract_int(&stcb->asoc.refcnt, 1);
3993 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
3994 /* assoc was freed while we were unlocked */
3995 SCTP_SOCKET_UNLOCK(so, 1);
3999 sctp_sowwakeup_locked(stcb->sctp_ep, stcb->sctp_socket);
4000 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4001 SCTP_SOCKET_UNLOCK(so, 1);
4004 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) {
4005 sctp_wakeup_log(stcb, 1, SCTP_NOWAKE_FROM_SACK);
4009 /* JRS - Use the congestion control given in the CC module */
4010 if ((asoc->last_acked_seq != cumack) && (ecne_seen == 0)) {
4011 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4012 if (net->net_ack2 > 0) {
4014 * Karn's rule applies to clearing error
4015 * count, this is optional.
4017 net->error_count = 0;
4018 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
4019 /* addr came good */
4020 net->dest_state |= SCTP_ADDR_REACHABLE;
4021 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
4022 0, (void *)net, SCTP_SO_NOT_LOCKED);
4024 if (net == stcb->asoc.primary_destination) {
4025 if (stcb->asoc.alternate) {
4027 * release the alternate,
4030 sctp_free_remote_addr(stcb->asoc.alternate);
4031 stcb->asoc.alternate = NULL;
4034 if (net->dest_state & SCTP_ADDR_PF) {
4035 net->dest_state &= ~SCTP_ADDR_PF;
4036 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
4037 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
4038 asoc->cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
4039 /* Done with this net */
4042 /* restore any doubled timers */
4043 net->RTO = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv;
4044 if (net->RTO < stcb->asoc.minrto) {
4045 net->RTO = stcb->asoc.minrto;
4047 if (net->RTO > stcb->asoc.maxrto) {
4048 net->RTO = stcb->asoc.maxrto;
4052 asoc->cc_functions.sctp_cwnd_update_after_sack(stcb, asoc, 1, 0, 0);
4054 asoc->last_acked_seq = cumack;
4056 if (TAILQ_EMPTY(&asoc->sent_queue)) {
4057 /* nothing left in-flight */
4058 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4059 net->flight_size = 0;
4060 net->partial_bytes_acked = 0;
4062 asoc->total_flight = 0;
4063 asoc->total_flight_count = 0;
4066 asoc->peers_rwnd = sctp_sbspace_sub(rwnd,
4067 (uint32_t) (asoc->total_flight + (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh))));
4068 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4069 /* SWS sender side engages */
4070 asoc->peers_rwnd = 0;
4072 if (asoc->peers_rwnd > old_rwnd) {
4073 win_probe_recovery = 1;
4075 /* Now assure a timer where data is queued at */
4078 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4081 if (win_probe_recovery && (net->window_probe)) {
4082 win_probe_recovered = 1;
4084 * Find first chunk that was used with window probe
4085 * and clear the sent
4087 /* sa_ignore FREED_MEMORY */
4088 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
4089 if (tp1->window_probe) {
4090 /* move back to data send queue */
4091 sctp_window_probe_recovery(stcb, asoc, tp1);
4096 if (net->RTO == 0) {
4097 to_ticks = MSEC_TO_TICKS(stcb->asoc.initial_rto);
4099 to_ticks = MSEC_TO_TICKS(net->RTO);
4101 if (net->flight_size) {
4103 (void)SCTP_OS_TIMER_START(&net->rxt_timer.timer, to_ticks,
4104 sctp_timeout_handler, &net->rxt_timer);
4105 if (net->window_probe) {
4106 net->window_probe = 0;
4109 if (net->window_probe) {
4111 * In window probes we must assure a timer
4112 * is still running there
4114 net->window_probe = 0;
4115 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4116 SCTP_OS_TIMER_START(&net->rxt_timer.timer, to_ticks,
4117 sctp_timeout_handler, &net->rxt_timer);
4119 } else if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4120 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
4122 SCTP_FROM_SCTP_INDATA + SCTP_LOC_22);
4127 (!TAILQ_EMPTY(&asoc->sent_queue)) &&
4128 (asoc->sent_queue_retran_cnt == 0) &&
4129 (win_probe_recovered == 0) &&
4132 * huh, this should not happen unless all packets are
4133 * PR-SCTP and marked to skip of course.
4135 if (sctp_fs_audit(asoc)) {
4136 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4137 net->flight_size = 0;
4139 asoc->total_flight = 0;
4140 asoc->total_flight_count = 0;
4141 asoc->sent_queue_retran_cnt = 0;
4142 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
4143 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
4144 sctp_flight_size_increase(tp1);
4145 sctp_total_flight_increase(stcb, tp1);
4146 } else if (tp1->sent == SCTP_DATAGRAM_RESEND) {
4147 sctp_ucount_incr(asoc->sent_queue_retran_cnt);
4154 /**********************************/
4155 /* Now what about shutdown issues */
4156 /**********************************/
4157 if (TAILQ_EMPTY(&asoc->send_queue) && TAILQ_EMPTY(&asoc->sent_queue)) {
4158 /* nothing left on sendqueue.. consider done */
4160 if ((asoc->stream_queue_cnt == 1) &&
4161 ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
4162 (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED)) &&
4163 (asoc->locked_on_sending)
4165 struct sctp_stream_queue_pending *sp;
4168 * I may be in a state where we got all across.. but
4169 * cannot write more due to a shutdown... we abort
4170 * since the user did not indicate EOR in this case.
4171 * The sp will be cleaned during free of the asoc.
4173 sp = TAILQ_LAST(&((asoc->locked_on_sending)->outqueue),
4175 if ((sp) && (sp->length == 0)) {
4176 /* Let cleanup code purge it */
4177 if (sp->msg_is_complete) {
4178 asoc->stream_queue_cnt--;
4180 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
4181 asoc->locked_on_sending = NULL;
4182 asoc->stream_queue_cnt--;
4186 if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) &&
4187 (asoc->stream_queue_cnt == 0)) {
4188 if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) {
4189 /* Need to abort here */
4195 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)),
4196 0, M_DONTWAIT, 1, MT_DATA);
4198 struct sctp_paramhdr *ph;
4201 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
4203 ph = mtod(oper, struct sctp_paramhdr *);
4204 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
4205 ph->param_length = htons(SCTP_BUF_LEN(oper));
4206 ippp = (uint32_t *) (ph + 1);
4207 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_24);
4209 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_24;
4210 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED);
4212 struct sctp_nets *netp;
4214 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
4215 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
4216 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
4218 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
4219 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
4220 sctp_stop_timers_for_shutdown(stcb);
4221 if (asoc->alternate) {
4222 netp = asoc->alternate;
4224 netp = asoc->primary_destination;
4226 sctp_send_shutdown(stcb, netp);
4227 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
4228 stcb->sctp_ep, stcb, netp);
4229 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
4230 stcb->sctp_ep, stcb, netp);
4232 } else if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) &&
4233 (asoc->stream_queue_cnt == 0)) {
4234 struct sctp_nets *netp;
4236 if (asoc->alternate) {
4237 netp = asoc->alternate;
4239 netp = asoc->primary_destination;
4241 if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) {
4244 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
4245 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
4246 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
4247 sctp_send_shutdown_ack(stcb, netp);
4248 sctp_stop_timers_for_shutdown(stcb);
4249 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
4250 stcb->sctp_ep, stcb, netp);
4253 /*********************************************/
4254 /* Here we perform PR-SCTP procedures */
4256 /*********************************************/
4257 /* C1. update advancedPeerAckPoint */
4258 if (SCTP_TSN_GT(cumack, asoc->advanced_peer_ack_point)) {
4259 asoc->advanced_peer_ack_point = cumack;
4261 /* PR-Sctp issues need to be addressed too */
4262 if ((asoc->peer_supports_prsctp) && (asoc->pr_sctp_cnt > 0)) {
4263 struct sctp_tmit_chunk *lchk;
4264 uint32_t old_adv_peer_ack_point;
4266 old_adv_peer_ack_point = asoc->advanced_peer_ack_point;
4267 lchk = sctp_try_advance_peer_ack_point(stcb, asoc);
4268 /* C3. See if we need to send a Fwd-TSN */
4269 if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, cumack)) {
4271 * ISSUE with ECN, see FWD-TSN processing.
4273 if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, old_adv_peer_ack_point)) {
4274 send_forward_tsn(stcb, asoc);
4276 /* try to FR fwd-tsn's that get lost too */
4277 if (lchk->rec.data.fwd_tsn_cnt >= 3) {
4278 send_forward_tsn(stcb, asoc);
4283 /* Assure a timer is up */
4284 sctp_timer_start(SCTP_TIMER_TYPE_SEND,
4285 stcb->sctp_ep, stcb, lchk->whoTo);
4288 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_RWND_LOGGING_ENABLE) {
4289 sctp_misc_ints(SCTP_SACK_RWND_UPDATE,
4291 stcb->asoc.peers_rwnd,
4292 stcb->asoc.total_flight,
4293 stcb->asoc.total_output_queue_size);
4298 sctp_handle_sack(struct mbuf *m, int offset_seg, int offset_dup,
4299 struct sctp_tcb *stcb,
4300 uint16_t num_seg, uint16_t num_nr_seg, uint16_t num_dup,
4301 int *abort_now, uint8_t flags,
4302 uint32_t cum_ack, uint32_t rwnd, int ecne_seen)
4304 struct sctp_association *asoc;
4305 struct sctp_tmit_chunk *tp1, *tp2;
4306 uint32_t last_tsn, biggest_tsn_acked, biggest_tsn_newly_acked, this_sack_lowest_newack;
4307 uint16_t wake_him = 0;
4308 uint32_t send_s = 0;
4310 int accum_moved = 0;
4311 int will_exit_fast_recovery = 0;
4312 uint32_t a_rwnd, old_rwnd;
4313 int win_probe_recovery = 0;
4314 int win_probe_recovered = 0;
4315 struct sctp_nets *net = NULL;
4318 uint8_t reneged_all = 0;
4319 uint8_t cmt_dac_flag;
4322 * we take any chance we can to service our queues since we cannot
4323 * get awoken when the socket is read from :<
4326 * Now perform the actual SACK handling: 1) Verify that it is not an
4327 * old sack, if so discard. 2) If there is nothing left in the send
4328 * queue (cum-ack is equal to last acked) then you have a duplicate
4329 * too, update any rwnd change and verify no timers are running.
4330 * then return. 3) Process any new consequtive data i.e. cum-ack
4331 * moved process these first and note that it moved. 4) Process any
4332 * sack blocks. 5) Drop any acked from the queue. 6) Check for any
4333 * revoked blocks and mark. 7) Update the cwnd. 8) Nothing left,
4334 * sync up flightsizes and things, stop all timers and also check
4335 * for shutdown_pending state. If so then go ahead and send off the
4336 * shutdown. If in shutdown recv, send off the shutdown-ack and
4337 * start that timer, Ret. 9) Strike any non-acked things and do FR
4338 * procedure if needed being sure to set the FR flag. 10) Do pr-sctp
4339 * procedures. 11) Apply any FR penalties. 12) Assure we will SACK
4340 * if in shutdown_recv state.
4342 SCTP_TCB_LOCK_ASSERT(stcb);
4344 this_sack_lowest_newack = 0;
4345 SCTP_STAT_INCR(sctps_slowpath_sack);
4347 cmt_dac_flag = flags & SCTP_SACK_CMT_DAC;
4348 #ifdef SCTP_ASOCLOG_OF_TSNS
4349 stcb->asoc.cumack_log[stcb->asoc.cumack_log_at] = cum_ack;
4350 stcb->asoc.cumack_log_at++;
4351 if (stcb->asoc.cumack_log_at > SCTP_TSN_LOG_SIZE) {
4352 stcb->asoc.cumack_log_at = 0;
4357 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_SACK_ARRIVALS_ENABLE) {
4358 sctp_misc_ints(SCTP_SACK_LOG_NORMAL, cum_ack,
4359 rwnd, stcb->asoc.last_acked_seq, stcb->asoc.peers_rwnd);
4361 old_rwnd = stcb->asoc.peers_rwnd;
4362 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4363 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4364 stcb->asoc.overall_error_count,
4366 SCTP_FROM_SCTP_INDATA,
4369 stcb->asoc.overall_error_count = 0;
4371 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
4372 sctp_log_sack(asoc->last_acked_seq,
4379 if ((num_dup) && (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE)) {
4381 uint32_t *dupdata, dblock;
4383 for (i = 0; i < num_dup; i++) {
4384 dupdata = (uint32_t *) sctp_m_getptr(m, offset_dup + i * sizeof(uint32_t),
4385 sizeof(uint32_t), (uint8_t *) & dblock);
4386 if (dupdata == NULL) {
4389 sctp_log_fr(*dupdata, 0, 0, SCTP_FR_DUPED);
4392 if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) {
4394 if (!TAILQ_EMPTY(&asoc->sent_queue)) {
4395 tp1 = TAILQ_LAST(&asoc->sent_queue,
4396 sctpchunk_listhead);
4397 send_s = tp1->rec.data.TSN_seq + 1;
4400 send_s = asoc->sending_seq;
4402 if (SCTP_TSN_GE(cum_ack, send_s)) {
4406 * no way, we have not even sent this TSN out yet.
4407 * Peer is hopelessly messed up with us.
4409 SCTP_PRINTF("NEW cum_ack:%x send_s:%x is smaller or equal\n",
4412 SCTP_PRINTF("Got send_s from tsn:%x + 1 of tp1:%p\n",
4413 tp1->rec.data.TSN_seq, tp1);
4418 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)),
4419 0, M_DONTWAIT, 1, MT_DATA);
4421 struct sctp_paramhdr *ph;
4424 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
4426 ph = mtod(oper, struct sctp_paramhdr *);
4427 ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
4428 ph->param_length = htons(SCTP_BUF_LEN(oper));
4429 ippp = (uint32_t *) (ph + 1);
4430 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_25);
4432 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_25;
4433 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED);
4437 /**********************/
4438 /* 1) check the range */
4439 /**********************/
4440 if (SCTP_TSN_GT(asoc->last_acked_seq, last_tsn)) {
4441 /* acking something behind */
4444 /* update the Rwnd of the peer */
4445 if (TAILQ_EMPTY(&asoc->sent_queue) &&
4446 TAILQ_EMPTY(&asoc->send_queue) &&
4447 (asoc->stream_queue_cnt == 0)) {
4448 /* nothing left on send/sent and strmq */
4449 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
4450 sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK,
4451 asoc->peers_rwnd, 0, 0, a_rwnd);
4453 asoc->peers_rwnd = a_rwnd;
4454 if (asoc->sent_queue_retran_cnt) {
4455 asoc->sent_queue_retran_cnt = 0;
4457 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4458 /* SWS sender side engages */
4459 asoc->peers_rwnd = 0;
4461 /* stop any timers */
4462 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4463 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
4464 stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_26);
4465 net->partial_bytes_acked = 0;
4466 net->flight_size = 0;
4468 asoc->total_flight = 0;
4469 asoc->total_flight_count = 0;
4473 * We init netAckSz and netAckSz2 to 0. These are used to track 2
4474 * things. The total byte count acked is tracked in netAckSz AND
4475 * netAck2 is used to track the total bytes acked that are un-
4476 * amibguious and were never retransmitted. We track these on a per
4477 * destination address basis.
4479 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4480 if (SCTP_TSN_GT(cum_ack, net->cwr_window_tsn)) {
4481 /* Drag along the window_tsn for cwr's */
4482 net->cwr_window_tsn = cum_ack;
4484 net->prev_cwnd = net->cwnd;
4489 * CMT: Reset CUC and Fast recovery algo variables before
4492 net->new_pseudo_cumack = 0;
4493 net->will_exit_fast_recovery = 0;
4494 if (stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack) {
4495 (*stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack) (stcb, net);
4498 /* process the new consecutive TSN first */
4499 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
4500 if (SCTP_TSN_GE(last_tsn, tp1->rec.data.TSN_seq)) {
4501 if (tp1->sent != SCTP_DATAGRAM_UNSENT) {
4503 if (tp1->sent < SCTP_DATAGRAM_ACKED) {
4505 * If it is less than ACKED, it is
4506 * now no-longer in flight. Higher
4507 * values may occur during marking
4509 if ((tp1->whoTo->dest_state &
4510 SCTP_ADDR_UNCONFIRMED) &&
4511 (tp1->snd_count < 2)) {
4513 * If there was no retran
4514 * and the address is
4515 * un-confirmed and we sent
4517 * sacked.. its confirmed,
4520 tp1->whoTo->dest_state &=
4521 ~SCTP_ADDR_UNCONFIRMED;
4523 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
4524 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
4525 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_CA,
4526 tp1->whoTo->flight_size,
4528 (uintptr_t) tp1->whoTo,
4529 tp1->rec.data.TSN_seq);
4531 sctp_flight_size_decrease(tp1);
4532 sctp_total_flight_decrease(stcb, tp1);
4533 if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) {
4534 (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo,
4538 tp1->whoTo->net_ack += tp1->send_size;
4540 /* CMT SFR and DAC algos */
4541 this_sack_lowest_newack = tp1->rec.data.TSN_seq;
4542 tp1->whoTo->saw_newack = 1;
4544 if (tp1->snd_count < 2) {
4546 * True non-retransmited
4549 tp1->whoTo->net_ack2 +=
4552 /* update RTO too? */
4556 sctp_calculate_rto(stcb,
4558 &tp1->sent_rcv_time,
4559 sctp_align_safe_nocopy,
4560 SCTP_RTT_FROM_DATA);
4563 if (tp1->whoTo->rto_needed == 0) {
4564 tp1->whoTo->rto_needed = 1;
4570 * CMT: CUCv2 algorithm. From the
4571 * cumack'd TSNs, for each TSN being
4572 * acked for the first time, set the
4573 * following variables for the
4574 * corresp destination.
4575 * new_pseudo_cumack will trigger a
4577 * find_(rtx_)pseudo_cumack will
4578 * trigger search for the next
4579 * expected (rtx-)pseudo-cumack.
4581 tp1->whoTo->new_pseudo_cumack = 1;
4582 tp1->whoTo->find_pseudo_cumack = 1;
4583 tp1->whoTo->find_rtx_pseudo_cumack = 1;
4586 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
4587 sctp_log_sack(asoc->last_acked_seq,
4589 tp1->rec.data.TSN_seq,
4592 SCTP_LOG_TSN_ACKED);
4594 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
4595 sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK);
4598 if (tp1->sent == SCTP_DATAGRAM_RESEND) {
4599 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
4600 #ifdef SCTP_AUDITING_ENABLED
4601 sctp_audit_log(0xB3,
4602 (asoc->sent_queue_retran_cnt & 0x000000ff));
4605 if (tp1->rec.data.chunk_was_revoked) {
4606 /* deflate the cwnd */
4607 tp1->whoTo->cwnd -= tp1->book_size;
4608 tp1->rec.data.chunk_was_revoked = 0;
4610 tp1->sent = SCTP_DATAGRAM_ACKED;
4616 biggest_tsn_newly_acked = biggest_tsn_acked = last_tsn;
4617 /* always set this up to cum-ack */
4618 asoc->this_sack_highest_gap = last_tsn;
4620 if ((num_seg > 0) || (num_nr_seg > 0)) {
4623 * CMT: SFR algo (and HTNA) - this_sack_highest_newack has
4624 * to be greater than the cumack. Also reset saw_newack to 0
4627 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4628 net->saw_newack = 0;
4629 net->this_sack_highest_newack = last_tsn;
4633 * thisSackHighestGap will increase while handling NEW
4634 * segments this_sack_highest_newack will increase while
4635 * handling NEWLY ACKED chunks. this_sack_lowest_newack is
4636 * used for CMT DAC algo. saw_newack will also change.
4638 if (sctp_handle_segments(m, &offset_seg, stcb, asoc, last_tsn, &biggest_tsn_acked,
4639 &biggest_tsn_newly_acked, &this_sack_lowest_newack,
4640 num_seg, num_nr_seg, &rto_ok)) {
4643 if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) {
4645 * validate the biggest_tsn_acked in the gap acks if
4646 * strict adherence is wanted.
4648 if (SCTP_TSN_GE(biggest_tsn_acked, send_s)) {
4650 * peer is either confused or we are under
4651 * attack. We must abort.
4653 SCTP_PRINTF("Hopeless peer! biggest_tsn_acked:%x largest seq:%x\n",
4654 biggest_tsn_acked, send_s);
4659 /*******************************************/
4660 /* cancel ALL T3-send timer if accum moved */
4661 /*******************************************/
4662 if (asoc->sctp_cmt_on_off > 0) {
4663 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4664 if (net->new_pseudo_cumack)
4665 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
4667 SCTP_FROM_SCTP_INDATA + SCTP_LOC_27);
4672 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4673 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
4674 stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_28);
4678 /********************************************/
4679 /* drop the acked chunks from the sentqueue */
4680 /********************************************/
4681 asoc->last_acked_seq = cum_ack;
4683 TAILQ_FOREACH_SAFE(tp1, &asoc->sent_queue, sctp_next, tp2) {
4684 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, cum_ack)) {
4687 if (tp1->sent == SCTP_DATAGRAM_UNSENT) {
4688 /* no more sent on list */
4689 SCTP_PRINTF("Warning, tp1->sent == %d and its now acked?\n",
4692 TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next);
4693 if (tp1->pr_sctp_on) {
4694 if (asoc->pr_sctp_cnt != 0)
4695 asoc->pr_sctp_cnt--;
4697 asoc->sent_queue_cnt--;
4699 /* sa_ignore NO_NULL_CHK */
4700 sctp_free_bufspace(stcb, asoc, tp1, 1);
4701 sctp_m_freem(tp1->data);
4703 if (asoc->peer_supports_prsctp && PR_SCTP_BUF_ENABLED(tp1->flags)) {
4704 asoc->sent_queue_cnt_removeable--;
4707 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
4708 sctp_log_sack(asoc->last_acked_seq,
4710 tp1->rec.data.TSN_seq,
4713 SCTP_LOG_FREE_SENT);
4715 sctp_free_a_chunk(stcb, tp1, SCTP_SO_NOT_LOCKED);
4718 if (TAILQ_EMPTY(&asoc->sent_queue) && (asoc->total_flight > 0)) {
4720 panic("Warning flight size is postive and should be 0");
4722 SCTP_PRINTF("Warning flight size incorrect should be 0 is %d\n",
4723 asoc->total_flight);
4725 asoc->total_flight = 0;
4727 /* sa_ignore NO_NULL_CHK */
4728 if ((wake_him) && (stcb->sctp_socket)) {
4729 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4733 SOCKBUF_LOCK(&stcb->sctp_socket->so_snd);
4734 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) {
4735 sctp_wakeup_log(stcb, wake_him, SCTP_WAKESND_FROM_SACK);
4737 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4738 so = SCTP_INP_SO(stcb->sctp_ep);
4739 atomic_add_int(&stcb->asoc.refcnt, 1);
4740 SCTP_TCB_UNLOCK(stcb);
4741 SCTP_SOCKET_LOCK(so, 1);
4742 SCTP_TCB_LOCK(stcb);
4743 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4744 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
4745 /* assoc was freed while we were unlocked */
4746 SCTP_SOCKET_UNLOCK(so, 1);
4750 sctp_sowwakeup_locked(stcb->sctp_ep, stcb->sctp_socket);
4751 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4752 SCTP_SOCKET_UNLOCK(so, 1);
4755 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) {
4756 sctp_wakeup_log(stcb, wake_him, SCTP_NOWAKE_FROM_SACK);
4760 if (asoc->fast_retran_loss_recovery && accum_moved) {
4761 if (SCTP_TSN_GE(asoc->last_acked_seq, asoc->fast_recovery_tsn)) {
4762 /* Setup so we will exit RFC2582 fast recovery */
4763 will_exit_fast_recovery = 1;
4767 * Check for revoked fragments:
4769 * if Previous sack - Had no frags then we can't have any revoked if
4770 * Previous sack - Had frag's then - If we now have frags aka
4771 * num_seg > 0 call sctp_check_for_revoked() to tell if peer revoked
4772 * some of them. else - The peer revoked all ACKED fragments, since
4773 * we had some before and now we have NONE.
4777 sctp_check_for_revoked(stcb, asoc, cum_ack, biggest_tsn_acked);
4778 asoc->saw_sack_with_frags = 1;
4779 } else if (asoc->saw_sack_with_frags) {
4780 int cnt_revoked = 0;
4782 /* Peer revoked all dg's marked or acked */
4783 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
4784 if (tp1->sent == SCTP_DATAGRAM_ACKED) {
4785 tp1->sent = SCTP_DATAGRAM_SENT;
4786 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
4787 sctp_misc_ints(SCTP_FLIGHT_LOG_UP_REVOKE,
4788 tp1->whoTo->flight_size,
4790 (uintptr_t) tp1->whoTo,
4791 tp1->rec.data.TSN_seq);
4793 sctp_flight_size_increase(tp1);
4794 sctp_total_flight_increase(stcb, tp1);
4795 tp1->rec.data.chunk_was_revoked = 1;
4797 * To ensure that this increase in
4798 * flightsize, which is artificial, does not
4799 * throttle the sender, we also increase the
4800 * cwnd artificially.
4802 tp1->whoTo->cwnd += tp1->book_size;
4809 asoc->saw_sack_with_frags = 0;
4812 asoc->saw_sack_with_nr_frags = 1;
4814 asoc->saw_sack_with_nr_frags = 0;
4816 /* JRS - Use the congestion control given in the CC module */
4817 if (ecne_seen == 0) {
4818 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4819 if (net->net_ack2 > 0) {
4821 * Karn's rule applies to clearing error
4822 * count, this is optional.
4824 net->error_count = 0;
4825 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
4826 /* addr came good */
4827 net->dest_state |= SCTP_ADDR_REACHABLE;
4828 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
4829 0, (void *)net, SCTP_SO_NOT_LOCKED);
4831 if (net == stcb->asoc.primary_destination) {
4832 if (stcb->asoc.alternate) {
4834 * release the alternate,
4837 sctp_free_remote_addr(stcb->asoc.alternate);
4838 stcb->asoc.alternate = NULL;
4841 if (net->dest_state & SCTP_ADDR_PF) {
4842 net->dest_state &= ~SCTP_ADDR_PF;
4843 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
4844 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
4845 asoc->cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
4846 /* Done with this net */
4849 /* restore any doubled timers */
4850 net->RTO = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv;
4851 if (net->RTO < stcb->asoc.minrto) {
4852 net->RTO = stcb->asoc.minrto;
4854 if (net->RTO > stcb->asoc.maxrto) {
4855 net->RTO = stcb->asoc.maxrto;
4859 asoc->cc_functions.sctp_cwnd_update_after_sack(stcb, asoc, accum_moved, reneged_all, will_exit_fast_recovery);
4861 if (TAILQ_EMPTY(&asoc->sent_queue)) {
4862 /* nothing left in-flight */
4863 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4864 /* stop all timers */
4865 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
4866 stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_30);
4867 net->flight_size = 0;
4868 net->partial_bytes_acked = 0;
4870 asoc->total_flight = 0;
4871 asoc->total_flight_count = 0;
4873 /**********************************/
4874 /* Now what about shutdown issues */
4875 /**********************************/
4876 if (TAILQ_EMPTY(&asoc->send_queue) && TAILQ_EMPTY(&asoc->sent_queue)) {
4877 /* nothing left on sendqueue.. consider done */
4878 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
4879 sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK,
4880 asoc->peers_rwnd, 0, 0, a_rwnd);
4882 asoc->peers_rwnd = a_rwnd;
4883 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4884 /* SWS sender side engages */
4885 asoc->peers_rwnd = 0;
4888 if ((asoc->stream_queue_cnt == 1) &&
4889 ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
4890 (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED)) &&
4891 (asoc->locked_on_sending)
4893 struct sctp_stream_queue_pending *sp;
4896 * I may be in a state where we got all across.. but
4897 * cannot write more due to a shutdown... we abort
4898 * since the user did not indicate EOR in this case.
4900 sp = TAILQ_LAST(&((asoc->locked_on_sending)->outqueue),
4902 if ((sp) && (sp->length == 0)) {
4903 asoc->locked_on_sending = NULL;
4904 if (sp->msg_is_complete) {
4905 asoc->stream_queue_cnt--;
4907 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
4908 asoc->stream_queue_cnt--;
4912 if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) &&
4913 (asoc->stream_queue_cnt == 0)) {
4914 if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) {
4915 /* Need to abort here */
4921 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)),
4922 0, M_DONTWAIT, 1, MT_DATA);
4924 struct sctp_paramhdr *ph;
4927 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
4929 ph = mtod(oper, struct sctp_paramhdr *);
4930 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
4931 ph->param_length = htons(SCTP_BUF_LEN(oper));
4932 ippp = (uint32_t *) (ph + 1);
4933 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_31);
4935 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_31;
4936 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED);
4939 struct sctp_nets *netp;
4941 if (asoc->alternate) {
4942 netp = asoc->alternate;
4944 netp = asoc->primary_destination;
4946 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
4947 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
4948 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
4950 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
4951 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
4952 sctp_stop_timers_for_shutdown(stcb);
4953 sctp_send_shutdown(stcb, netp);
4954 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
4955 stcb->sctp_ep, stcb, netp);
4956 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
4957 stcb->sctp_ep, stcb, netp);
4960 } else if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) &&
4961 (asoc->stream_queue_cnt == 0)) {
4962 struct sctp_nets *netp;
4964 if (asoc->alternate) {
4965 netp = asoc->alternate;
4967 netp = asoc->primary_destination;
4969 if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) {
4972 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
4973 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
4974 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
4975 sctp_send_shutdown_ack(stcb, netp);
4976 sctp_stop_timers_for_shutdown(stcb);
4977 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
4978 stcb->sctp_ep, stcb, netp);
4983 * Now here we are going to recycle net_ack for a different use...
4986 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4991 * CMT DAC algorithm: If SACK DAC flag was 0, then no extra marking
4992 * to be done. Setting this_sack_lowest_newack to the cum_ack will
4993 * automatically ensure that.
4995 if ((asoc->sctp_cmt_on_off > 0) &&
4996 SCTP_BASE_SYSCTL(sctp_cmt_use_dac) &&
4997 (cmt_dac_flag == 0)) {
4998 this_sack_lowest_newack = cum_ack;
5000 if ((num_seg > 0) || (num_nr_seg > 0)) {
5001 sctp_strike_gap_ack_chunks(stcb, asoc, biggest_tsn_acked,
5002 biggest_tsn_newly_acked, this_sack_lowest_newack, accum_moved);
5004 /* JRS - Use the congestion control given in the CC module */
5005 asoc->cc_functions.sctp_cwnd_update_after_fr(stcb, asoc);
5007 /* Now are we exiting loss recovery ? */
5008 if (will_exit_fast_recovery) {
5009 /* Ok, we must exit fast recovery */
5010 asoc->fast_retran_loss_recovery = 0;
5012 if ((asoc->sat_t3_loss_recovery) &&
5013 SCTP_TSN_GE(asoc->last_acked_seq, asoc->sat_t3_recovery_tsn)) {
5014 /* end satellite t3 loss recovery */
5015 asoc->sat_t3_loss_recovery = 0;
5020 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5021 if (net->will_exit_fast_recovery) {
5022 /* Ok, we must exit fast recovery */
5023 net->fast_retran_loss_recovery = 0;
5027 /* Adjust and set the new rwnd value */
5028 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
5029 sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK,
5030 asoc->peers_rwnd, asoc->total_flight, (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)), a_rwnd);
5032 asoc->peers_rwnd = sctp_sbspace_sub(a_rwnd,
5033 (uint32_t) (asoc->total_flight + (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh))));
5034 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
5035 /* SWS sender side engages */
5036 asoc->peers_rwnd = 0;
5038 if (asoc->peers_rwnd > old_rwnd) {
5039 win_probe_recovery = 1;
5042 * Now we must setup so we have a timer up for anyone with
5048 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5049 if (win_probe_recovery && (net->window_probe)) {
5050 win_probe_recovered = 1;
5052 * Find first chunk that was used with
5053 * window probe and clear the event. Put
5054 * it back into the send queue as if has
5057 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
5058 if (tp1->window_probe) {
5059 sctp_window_probe_recovery(stcb, asoc, tp1);
5064 if (net->flight_size) {
5066 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
5067 sctp_timer_start(SCTP_TIMER_TYPE_SEND,
5068 stcb->sctp_ep, stcb, net);
5070 if (net->window_probe) {
5071 net->window_probe = 0;
5074 if (net->window_probe) {
5076 * In window probes we must assure a timer
5077 * is still running there
5079 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
5080 sctp_timer_start(SCTP_TIMER_TYPE_SEND,
5081 stcb->sctp_ep, stcb, net);
5084 } else if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
5085 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
5087 SCTP_FROM_SCTP_INDATA + SCTP_LOC_22);
5092 (!TAILQ_EMPTY(&asoc->sent_queue)) &&
5093 (asoc->sent_queue_retran_cnt == 0) &&
5094 (win_probe_recovered == 0) &&
5097 * huh, this should not happen unless all packets are
5098 * PR-SCTP and marked to skip of course.
5100 if (sctp_fs_audit(asoc)) {
5101 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5102 net->flight_size = 0;
5104 asoc->total_flight = 0;
5105 asoc->total_flight_count = 0;
5106 asoc->sent_queue_retran_cnt = 0;
5107 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
5108 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
5109 sctp_flight_size_increase(tp1);
5110 sctp_total_flight_increase(stcb, tp1);
5111 } else if (tp1->sent == SCTP_DATAGRAM_RESEND) {
5112 sctp_ucount_incr(asoc->sent_queue_retran_cnt);
5119 /*********************************************/
5120 /* Here we perform PR-SCTP procedures */
5122 /*********************************************/
5123 /* C1. update advancedPeerAckPoint */
5124 if (SCTP_TSN_GT(cum_ack, asoc->advanced_peer_ack_point)) {
5125 asoc->advanced_peer_ack_point = cum_ack;
5127 /* C2. try to further move advancedPeerAckPoint ahead */
5128 if ((asoc->peer_supports_prsctp) && (asoc->pr_sctp_cnt > 0)) {
5129 struct sctp_tmit_chunk *lchk;
5130 uint32_t old_adv_peer_ack_point;
5132 old_adv_peer_ack_point = asoc->advanced_peer_ack_point;
5133 lchk = sctp_try_advance_peer_ack_point(stcb, asoc);
5134 /* C3. See if we need to send a Fwd-TSN */
5135 if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, cum_ack)) {
5137 * ISSUE with ECN, see FWD-TSN processing.
5139 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
5140 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
5141 0xee, cum_ack, asoc->advanced_peer_ack_point,
5142 old_adv_peer_ack_point);
5144 if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, old_adv_peer_ack_point)) {
5145 send_forward_tsn(stcb, asoc);
5147 /* try to FR fwd-tsn's that get lost too */
5148 if (lchk->rec.data.fwd_tsn_cnt >= 3) {
5149 send_forward_tsn(stcb, asoc);
5154 /* Assure a timer is up */
5155 sctp_timer_start(SCTP_TIMER_TYPE_SEND,
5156 stcb->sctp_ep, stcb, lchk->whoTo);
5159 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_RWND_LOGGING_ENABLE) {
5160 sctp_misc_ints(SCTP_SACK_RWND_UPDATE,
5162 stcb->asoc.peers_rwnd,
5163 stcb->asoc.total_flight,
5164 stcb->asoc.total_output_queue_size);
5169 sctp_update_acked(struct sctp_tcb *stcb, struct sctp_shutdown_chunk *cp, int *abort_flag)
5172 uint32_t cum_ack, a_rwnd;
5174 cum_ack = ntohl(cp->cumulative_tsn_ack);
5175 /* Arrange so a_rwnd does NOT change */
5176 a_rwnd = stcb->asoc.peers_rwnd + stcb->asoc.total_flight;
5178 /* Now call the express sack handling */
5179 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, abort_flag, 0);
5183 sctp_kick_prsctp_reorder_queue(struct sctp_tcb *stcb,
5184 struct sctp_stream_in *strmin)
5186 struct sctp_queued_to_read *ctl, *nctl;
5187 struct sctp_association *asoc;
5191 tt = strmin->last_sequence_delivered;
5193 * First deliver anything prior to and including the stream no that
5196 TAILQ_FOREACH_SAFE(ctl, &strmin->inqueue, next, nctl) {
5197 if (SCTP_SSN_GE(tt, ctl->sinfo_ssn)) {
5198 /* this is deliverable now */
5199 TAILQ_REMOVE(&strmin->inqueue, ctl, next);
5200 /* subtract pending on streams */
5201 asoc->size_on_all_streams -= ctl->length;
5202 sctp_ucount_decr(asoc->cnt_on_all_streams);
5203 /* deliver it to at least the delivery-q */
5204 if (stcb->sctp_socket) {
5205 sctp_mark_non_revokable(asoc, ctl->sinfo_tsn);
5206 sctp_add_to_readq(stcb->sctp_ep, stcb,
5208 &stcb->sctp_socket->so_rcv, 1, SCTP_READ_LOCK_HELD, SCTP_SO_NOT_LOCKED);
5211 /* no more delivery now. */
5216 * now we must deliver things in queue the normal way if any are
5219 tt = strmin->last_sequence_delivered + 1;
5220 TAILQ_FOREACH_SAFE(ctl, &strmin->inqueue, next, nctl) {
5221 if (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 strmin->last_sequence_delivered = ctl->sinfo_ssn;
5229 if (stcb->sctp_socket) {
5230 sctp_mark_non_revokable(asoc, ctl->sinfo_tsn);
5231 sctp_add_to_readq(stcb->sctp_ep, stcb,
5233 &stcb->sctp_socket->so_rcv, 1, SCTP_READ_LOCK_HELD, SCTP_SO_NOT_LOCKED);
5236 tt = strmin->last_sequence_delivered + 1;
5244 sctp_flush_reassm_for_str_seq(struct sctp_tcb *stcb,
5245 struct sctp_association *asoc,
5246 uint16_t stream, uint16_t seq)
5248 struct sctp_tmit_chunk *chk, *nchk;
5250 /* For each one on here see if we need to toss it */
5252 * For now large messages held on the reasmqueue that are complete
5253 * will be tossed too. We could in theory do more work to spin
5254 * through and stop after dumping one msg aka seeing the start of a
5255 * new msg at the head, and call the delivery function... to see if
5256 * it can be delivered... But for now we just dump everything on the
5259 TAILQ_FOREACH_SAFE(chk, &asoc->reasmqueue, sctp_next, nchk) {
5261 * Do not toss it if on a different stream or marked for
5262 * unordered delivery in which case the stream sequence
5263 * number has no meaning.
5265 if ((chk->rec.data.stream_number != stream) ||
5266 ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == SCTP_DATA_UNORDERED)) {
5269 if (chk->rec.data.stream_seq == seq) {
5270 /* It needs to be tossed */
5271 TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next);
5272 if (SCTP_TSN_GT(chk->rec.data.TSN_seq, asoc->tsn_last_delivered)) {
5273 asoc->tsn_last_delivered = chk->rec.data.TSN_seq;
5274 asoc->str_of_pdapi = chk->rec.data.stream_number;
5275 asoc->ssn_of_pdapi = chk->rec.data.stream_seq;
5276 asoc->fragment_flags = chk->rec.data.rcv_flags;
5278 asoc->size_on_reasm_queue -= chk->send_size;
5279 sctp_ucount_decr(asoc->cnt_on_reasm_queue);
5281 /* Clear up any stream problem */
5282 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) != SCTP_DATA_UNORDERED &&
5283 SCTP_SSN_GT(chk->rec.data.stream_seq, asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered)) {
5285 * We must dump forward this streams
5286 * sequence number if the chunk is not
5287 * unordered that is being skipped. There is
5288 * a chance that if the peer does not
5289 * include the last fragment in its FWD-TSN
5290 * we WILL have a problem here since you
5291 * would have a partial chunk in queue that
5292 * may not be deliverable. Also if a Partial
5293 * delivery API as started the user may get
5294 * a partial chunk. The next read returning
5295 * a new chunk... really ugly but I see no
5296 * way around it! Maybe a notify??
5298 asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered = chk->rec.data.stream_seq;
5301 sctp_m_freem(chk->data);
5304 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
5305 } else if (SCTP_SSN_GT(chk->rec.data.stream_seq, seq)) {
5307 * If the stream_seq is > than the purging one, we
5317 sctp_handle_forward_tsn(struct sctp_tcb *stcb,
5318 struct sctp_forward_tsn_chunk *fwd,
5319 int *abort_flag, struct mbuf *m, int offset)
5321 /* The pr-sctp fwd tsn */
5323 * here we will perform all the data receiver side steps for
5324 * processing FwdTSN, as required in by pr-sctp draft:
5326 * Assume we get FwdTSN(x):
5328 * 1) update local cumTSN to x 2) try to further advance cumTSN to x +
5329 * others we have 3) examine and update re-ordering queue on
5330 * pr-in-streams 4) clean up re-assembly queue 5) Send a sack to
5331 * report where we are.
5333 struct sctp_association *asoc;
5334 uint32_t new_cum_tsn, gap;
5335 unsigned int i, fwd_sz, m_size;
5337 struct sctp_stream_in *strm;
5338 struct sctp_tmit_chunk *chk, *nchk;
5339 struct sctp_queued_to_read *ctl, *sv;
5342 if ((fwd_sz = ntohs(fwd->ch.chunk_length)) < sizeof(struct sctp_forward_tsn_chunk)) {
5343 SCTPDBG(SCTP_DEBUG_INDATA1,
5344 "Bad size too small/big fwd-tsn\n");
5347 m_size = (stcb->asoc.mapping_array_size << 3);
5348 /*************************************************************/
5349 /* 1. Here we update local cumTSN and shift the bitmap array */
5350 /*************************************************************/
5351 new_cum_tsn = ntohl(fwd->new_cumulative_tsn);
5353 if (SCTP_TSN_GE(asoc->cumulative_tsn, new_cum_tsn)) {
5354 /* Already got there ... */
5358 * now we know the new TSN is more advanced, let's find the actual
5361 SCTP_CALC_TSN_TO_GAP(gap, new_cum_tsn, asoc->mapping_array_base_tsn);
5362 asoc->cumulative_tsn = new_cum_tsn;
5363 if (gap >= m_size) {
5364 if ((long)gap > sctp_sbspace(&stcb->asoc, &stcb->sctp_socket->so_rcv)) {
5368 * out of range (of single byte chunks in the rwnd I
5369 * give out). This must be an attacker.
5372 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
5373 0, M_DONTWAIT, 1, MT_DATA);
5375 struct sctp_paramhdr *ph;
5378 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
5379 (sizeof(uint32_t) * 3);
5380 ph = mtod(oper, struct sctp_paramhdr *);
5381 ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5382 ph->param_length = htons(SCTP_BUF_LEN(oper));
5383 ippp = (uint32_t *) (ph + 1);
5384 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_33);
5386 *ippp = asoc->highest_tsn_inside_map;
5388 *ippp = new_cum_tsn;
5390 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_33;
5391 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED);
5394 SCTP_STAT_INCR(sctps_fwdtsn_map_over);
5396 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
5397 asoc->mapping_array_base_tsn = new_cum_tsn + 1;
5398 asoc->highest_tsn_inside_map = new_cum_tsn;
5400 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
5401 asoc->highest_tsn_inside_nr_map = new_cum_tsn;
5403 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
5404 sctp_log_map(0, 3, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
5407 SCTP_TCB_LOCK_ASSERT(stcb);
5408 for (i = 0; i <= gap; i++) {
5409 if (!SCTP_IS_TSN_PRESENT(asoc->mapping_array, i) &&
5410 !SCTP_IS_TSN_PRESENT(asoc->nr_mapping_array, i)) {
5411 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, i);
5412 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn + i, asoc->highest_tsn_inside_nr_map)) {
5413 asoc->highest_tsn_inside_nr_map = asoc->mapping_array_base_tsn + i;
5418 /*************************************************************/
5419 /* 2. Clear up re-assembly queue */
5420 /*************************************************************/
5422 * First service it if pd-api is up, just in case we can progress it
5425 if (asoc->fragmented_delivery_inprogress) {
5426 sctp_service_reassembly(stcb, asoc);
5428 /* For each one on here see if we need to toss it */
5430 * For now large messages held on the reasmqueue that are complete
5431 * will be tossed too. We could in theory do more work to spin
5432 * through and stop after dumping one msg aka seeing the start of a
5433 * new msg at the head, and call the delivery function... to see if
5434 * it can be delivered... But for now we just dump everything on the
5437 TAILQ_FOREACH_SAFE(chk, &asoc->reasmqueue, sctp_next, nchk) {
5438 if (SCTP_TSN_GE(new_cum_tsn, chk->rec.data.TSN_seq)) {
5439 /* It needs to be tossed */
5440 TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next);
5441 if (SCTP_TSN_GT(chk->rec.data.TSN_seq, asoc->tsn_last_delivered)) {
5442 asoc->tsn_last_delivered = chk->rec.data.TSN_seq;
5443 asoc->str_of_pdapi = chk->rec.data.stream_number;
5444 asoc->ssn_of_pdapi = chk->rec.data.stream_seq;
5445 asoc->fragment_flags = chk->rec.data.rcv_flags;
5447 asoc->size_on_reasm_queue -= chk->send_size;
5448 sctp_ucount_decr(asoc->cnt_on_reasm_queue);
5450 /* Clear up any stream problem */
5451 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) != SCTP_DATA_UNORDERED &&
5452 SCTP_SSN_GT(chk->rec.data.stream_seq, asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered)) {
5454 * We must dump forward this streams
5455 * sequence number if the chunk is not
5456 * unordered that is being skipped. There is
5457 * a chance that if the peer does not
5458 * include the last fragment in its FWD-TSN
5459 * we WILL have a problem here since you
5460 * would have a partial chunk in queue that
5461 * may not be deliverable. Also if a Partial
5462 * delivery API as started the user may get
5463 * a partial chunk. The next read returning
5464 * a new chunk... really ugly but I see no
5465 * way around it! Maybe a notify??
5467 asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered = chk->rec.data.stream_seq;
5470 sctp_m_freem(chk->data);
5473 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
5476 * Ok we have gone beyond the end of the fwd-tsn's
5482 /*******************************************************/
5483 /* 3. Update the PR-stream re-ordering queues and fix */
5484 /* delivery issues as needed. */
5485 /*******************************************************/
5486 fwd_sz -= sizeof(*fwd);
5489 unsigned int num_str;
5490 struct sctp_strseq *stseq, strseqbuf;
5492 offset += sizeof(*fwd);
5494 SCTP_INP_READ_LOCK(stcb->sctp_ep);
5495 num_str = fwd_sz / sizeof(struct sctp_strseq);
5496 for (i = 0; i < num_str; i++) {
5499 stseq = (struct sctp_strseq *)sctp_m_getptr(m, offset,
5500 sizeof(struct sctp_strseq),
5501 (uint8_t *) & strseqbuf);
5502 offset += sizeof(struct sctp_strseq);
5503 if (stseq == NULL) {
5507 st = ntohs(stseq->stream);
5509 st = ntohs(stseq->sequence);
5510 stseq->sequence = st;
5515 * Ok we now look for the stream/seq on the read
5516 * queue where its not all delivered. If we find it
5517 * we transmute the read entry into a PDI_ABORTED.
5519 if (stseq->stream >= asoc->streamincnt) {
5520 /* screwed up streams, stop! */
5523 if ((asoc->str_of_pdapi == stseq->stream) &&
5524 (asoc->ssn_of_pdapi == stseq->sequence)) {
5526 * If this is the one we were partially
5527 * delivering now then we no longer are.
5528 * Note this will change with the reassembly
5531 asoc->fragmented_delivery_inprogress = 0;
5533 sctp_flush_reassm_for_str_seq(stcb, asoc, stseq->stream, stseq->sequence);
5534 TAILQ_FOREACH(ctl, &stcb->sctp_ep->read_queue, next) {
5535 if ((ctl->sinfo_stream == stseq->stream) &&
5536 (ctl->sinfo_ssn == stseq->sequence)) {
5537 str_seq = (stseq->stream << 16) | stseq->sequence;
5539 ctl->pdapi_aborted = 1;
5540 sv = stcb->asoc.control_pdapi;
5541 stcb->asoc.control_pdapi = ctl;
5542 sctp_ulp_notify(SCTP_NOTIFY_PARTIAL_DELVIERY_INDICATION,
5544 SCTP_PARTIAL_DELIVERY_ABORTED,
5546 SCTP_SO_NOT_LOCKED);
5547 stcb->asoc.control_pdapi = sv;
5549 } else if ((ctl->sinfo_stream == stseq->stream) &&
5550 SCTP_SSN_GT(ctl->sinfo_ssn, stseq->sequence)) {
5551 /* We are past our victim SSN */
5555 strm = &asoc->strmin[stseq->stream];
5556 if (SCTP_SSN_GT(stseq->sequence, strm->last_sequence_delivered)) {
5557 /* Update the sequence number */
5558 strm->last_sequence_delivered = stseq->sequence;
5560 /* now kick the stream the new way */
5561 /* sa_ignore NO_NULL_CHK */
5562 sctp_kick_prsctp_reorder_queue(stcb, strm);
5564 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
5567 * Now slide thing forward.
5569 sctp_slide_mapping_arrays(stcb);
5571 if (!TAILQ_EMPTY(&asoc->reasmqueue)) {
5572 /* now lets kick out and check for more fragmented delivery */
5573 /* sa_ignore NO_NULL_CHK */
5574 sctp_deliver_reasm_check(stcb, &stcb->asoc);
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