1 /*- 2 * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved. 3 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved. 4 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are met: 8 * 9 * a) Redistributions of source code must retain the above copyright notice, 10 * this list of conditions and the following disclaimer. 11 * 12 * b) Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in 14 * the documentation and/or other materials provided with the distribution. 15 * 16 * c) Neither the name of Cisco Systems, Inc. nor the names of its 17 * contributors may be used to endorse or promote products derived 18 * from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 22 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 30 * THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 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> 47 48 49 /* 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. 53 * 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 56 * the list. 57 */ 58 59 void 60 sctp_set_rwnd(struct sctp_tcb *stcb, struct sctp_association *asoc) 61 { 62 asoc->my_rwnd = sctp_calc_rwnd(stcb, asoc); 63 } 64 65 /* Calculate what the rwnd would be */ 66 uint32_t 67 sctp_calc_rwnd(struct sctp_tcb *stcb, struct sctp_association *asoc) 68 { 69 uint32_t calc = 0; 70 71 /* 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. 76 */ 77 if (stcb->sctp_socket == NULL) 78 return (calc); 79 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); 85 return (calc); 86 } 87 /* get actual space */ 88 calc = (uint32_t) sctp_sbspace(&stcb->asoc, &stcb->sctp_socket->so_rcv); 89 90 /* 91 * take out what has NOT been put on socket queue and we yet hold 92 * for putting up. 93 */ 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)); 98 99 if (calc == 0) { 100 /* out of space */ 101 return (calc); 102 } 103 /* what is the overhead of all these rwnd's */ 104 calc = sctp_sbspace_sub(calc, stcb->asoc.my_rwnd_control_len); 105 /* 106 * If the window gets too small due to ctrl-stuff, reduce it to 1, 107 * even it is 0. SWS engaged 108 */ 109 if (calc < stcb->asoc.my_rwnd_control_len) { 110 calc = 1; 111 } 112 return (calc); 113 } 114 115 116 117 /* 118 * Build out our readq entry based on the incoming packet. 119 */ 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, 126 struct mbuf *dm) 127 { 128 struct sctp_queued_to_read *read_queue_e = NULL; 129 130 sctp_alloc_a_readq(stcb, read_queue_e); 131 if (read_queue_e == NULL) { 132 goto failed_build; 133 } 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; 156 failed_build: 157 return (read_queue_e); 158 } 159 160 161 /* 162 * Build out our readq entry based on the incoming packet. 163 */ 164 static struct sctp_queued_to_read * 165 sctp_build_readq_entry_chk(struct sctp_tcb *stcb, 166 struct sctp_tmit_chunk *chk) 167 { 168 struct sctp_queued_to_read *read_queue_e = NULL; 169 170 sctp_alloc_a_readq(stcb, read_queue_e); 171 if (read_queue_e == NULL) { 172 goto failed_build; 173 } 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; 196 failed_build: 197 return (read_queue_e); 198 } 199 200 201 struct mbuf * 202 sctp_build_ctl_nchunk(struct sctp_inpcb *inp, struct sctp_sndrcvinfo *sinfo) 203 { 204 struct sctp_extrcvinfo *seinfo; 205 struct sctp_sndrcvinfo *outinfo; 206 struct sctp_rcvinfo *rcvinfo; 207 struct sctp_nxtinfo *nxtinfo; 208 struct cmsghdr *cmh; 209 struct mbuf *ret; 210 int len; 211 int use_extended; 212 int provide_nxt; 213 214 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 */ 218 return (NULL); 219 } 220 len = 0; 221 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVRCVINFO)) { 222 len += CMSG_SPACE(sizeof(struct sctp_rcvinfo)); 223 } 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)) { 227 provide_nxt = 1; 228 len += CMSG_SPACE(sizeof(struct sctp_rcvinfo)); 229 } else { 230 provide_nxt = 0; 231 } 232 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVDATAIOEVNT)) { 233 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXT_RCVINFO)) { 234 use_extended = 1; 235 len += CMSG_SPACE(sizeof(struct sctp_extrcvinfo)); 236 } else { 237 use_extended = 0; 238 len += CMSG_SPACE(sizeof(struct sctp_sndrcvinfo)); 239 } 240 } else { 241 use_extended = 0; 242 } 243 244 ret = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA); 245 if (ret == NULL) { 246 /* No space */ 247 return (ret); 248 } 249 SCTP_BUF_LEN(ret) = 0; 250 251 /* We need a CMSG header followed by the struct */ 252 cmh = mtod(ret, struct cmsghdr *); 253 /* 254 * Make sure that there is no un-initialized padding between the 255 * cmsg header and cmsg data and after the cmsg data. 256 */ 257 memset(cmh, 0, len); 258 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVRCVINFO)) { 259 cmh->cmsg_level = IPPROTO_SCTP; 260 cmh->cmsg_len = CMSG_LEN(sizeof(struct sctp_rcvinfo)); 261 cmh->cmsg_type = SCTP_RCVINFO; 262 rcvinfo = (struct sctp_rcvinfo *)CMSG_DATA(cmh); 263 rcvinfo->rcv_sid = sinfo->sinfo_stream; 264 rcvinfo->rcv_ssn = sinfo->sinfo_ssn; 265 rcvinfo->rcv_flags = sinfo->sinfo_flags; 266 rcvinfo->rcv_ppid = sinfo->sinfo_ppid; 267 rcvinfo->rcv_tsn = sinfo->sinfo_tsn; 268 rcvinfo->rcv_cumtsn = sinfo->sinfo_cumtsn; 269 rcvinfo->rcv_context = sinfo->sinfo_context; 270 rcvinfo->rcv_assoc_id = sinfo->sinfo_assoc_id; 271 cmh = (struct cmsghdr *)((caddr_t)cmh + CMSG_SPACE(sizeof(struct sctp_rcvinfo))); 272 SCTP_BUF_LEN(ret) += CMSG_SPACE(sizeof(struct sctp_rcvinfo)); 273 } 274 if (provide_nxt) { 275 cmh->cmsg_level = IPPROTO_SCTP; 276 cmh->cmsg_len = CMSG_LEN(sizeof(struct sctp_nxtinfo)); 277 cmh->cmsg_type = SCTP_NXTINFO; 278 nxtinfo = (struct sctp_nxtinfo *)CMSG_DATA(cmh); 279 nxtinfo->nxt_sid = seinfo->sreinfo_next_stream; 280 nxtinfo->nxt_flags = 0; 281 if (seinfo->sreinfo_next_flags & SCTP_NEXT_MSG_IS_UNORDERED) { 282 nxtinfo->nxt_flags |= SCTP_UNORDERED; 283 } 284 if (seinfo->sreinfo_next_flags & SCTP_NEXT_MSG_IS_NOTIFICATION) { 285 nxtinfo->nxt_flags |= SCTP_NOTIFICATION; 286 } 287 if (seinfo->sreinfo_next_flags & SCTP_NEXT_MSG_ISCOMPLETE) { 288 nxtinfo->nxt_flags |= SCTP_COMPLETE; 289 } 290 nxtinfo->nxt_ppid = seinfo->sreinfo_next_ppid; 291 nxtinfo->nxt_length = seinfo->sreinfo_next_length; 292 nxtinfo->nxt_assoc_id = seinfo->sreinfo_next_aid; 293 cmh = (struct cmsghdr *)((caddr_t)cmh + CMSG_SPACE(sizeof(struct sctp_nxtinfo))); 294 SCTP_BUF_LEN(ret) += CMSG_SPACE(sizeof(struct sctp_nxtinfo)); 295 } 296 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVDATAIOEVNT)) { 297 cmh->cmsg_level = IPPROTO_SCTP; 298 outinfo = (struct sctp_sndrcvinfo *)CMSG_DATA(cmh); 299 if (use_extended) { 300 cmh->cmsg_len = CMSG_LEN(sizeof(struct sctp_extrcvinfo)); 301 cmh->cmsg_type = SCTP_EXTRCV; 302 memcpy(outinfo, sinfo, sizeof(struct sctp_extrcvinfo)); 303 SCTP_BUF_LEN(ret) += CMSG_SPACE(sizeof(struct sctp_extrcvinfo)); 304 } else { 305 cmh->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo)); 306 cmh->cmsg_type = SCTP_SNDRCV; 307 *outinfo = *sinfo; 308 SCTP_BUF_LEN(ret) += CMSG_SPACE(sizeof(struct sctp_sndrcvinfo)); 309 } 310 } 311 return (ret); 312 } 313 314 315 static void 316 sctp_mark_non_revokable(struct sctp_association *asoc, uint32_t tsn) 317 { 318 uint32_t gap, i, cumackp1; 319 int fnd = 0; 320 321 if (SCTP_BASE_SYSCTL(sctp_do_drain) == 0) { 322 return; 323 } 324 cumackp1 = asoc->cumulative_tsn + 1; 325 if (SCTP_TSN_GT(cumackp1, tsn)) { 326 /* 327 * this tsn is behind the cum ack and thus we don't need to 328 * worry about it being moved from one to the other. 329 */ 330 return; 331 } 332 SCTP_CALC_TSN_TO_GAP(gap, tsn, asoc->mapping_array_base_tsn); 333 if (!SCTP_IS_TSN_PRESENT(asoc->mapping_array, gap)) { 334 SCTP_PRINTF("gap:%x tsn:%x\n", gap, tsn); 335 sctp_print_mapping_array(asoc); 336 #ifdef INVARIANTS 337 panic("Things are really messed up now!!"); 338 #endif 339 } 340 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap); 341 SCTP_UNSET_TSN_PRESENT(asoc->mapping_array, gap); 342 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) { 343 asoc->highest_tsn_inside_nr_map = tsn; 344 } 345 if (tsn == asoc->highest_tsn_inside_map) { 346 /* We must back down to see what the new highest is */ 347 for (i = tsn - 1; SCTP_TSN_GE(i, asoc->mapping_array_base_tsn); i--) { 348 SCTP_CALC_TSN_TO_GAP(gap, i, asoc->mapping_array_base_tsn); 349 if (SCTP_IS_TSN_PRESENT(asoc->mapping_array, gap)) { 350 asoc->highest_tsn_inside_map = i; 351 fnd = 1; 352 break; 353 } 354 } 355 if (!fnd) { 356 asoc->highest_tsn_inside_map = asoc->mapping_array_base_tsn - 1; 357 } 358 } 359 } 360 361 362 /* 363 * We are delivering currently from the reassembly queue. We must continue to 364 * deliver until we either: 1) run out of space. 2) run out of sequential 365 * TSN's 3) hit the SCTP_DATA_LAST_FRAG flag. 366 */ 367 static void 368 sctp_service_reassembly(struct sctp_tcb *stcb, struct sctp_association *asoc) 369 { 370 struct sctp_tmit_chunk *chk, *nchk; 371 uint16_t nxt_todel; 372 uint16_t stream_no; 373 int end = 0; 374 int cntDel; 375 struct sctp_queued_to_read *control, *ctl, *nctl; 376 377 if (stcb == NULL) 378 return; 379 380 cntDel = stream_no = 0; 381 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 382 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) || 383 (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET)) { 384 /* socket above is long gone or going.. */ 385 abandon: 386 asoc->fragmented_delivery_inprogress = 0; 387 TAILQ_FOREACH_SAFE(chk, &asoc->reasmqueue, sctp_next, nchk) { 388 TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next); 389 asoc->size_on_reasm_queue -= chk->send_size; 390 sctp_ucount_decr(asoc->cnt_on_reasm_queue); 391 /* 392 * Lose the data pointer, since its in the socket 393 * buffer 394 */ 395 if (chk->data) { 396 sctp_m_freem(chk->data); 397 chk->data = NULL; 398 } 399 /* Now free the address and data */ 400 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 401 /* sa_ignore FREED_MEMORY */ 402 } 403 return; 404 } 405 SCTP_TCB_LOCK_ASSERT(stcb); 406 TAILQ_FOREACH_SAFE(chk, &asoc->reasmqueue, sctp_next, nchk) { 407 if (chk->rec.data.TSN_seq != (asoc->tsn_last_delivered + 1)) { 408 /* Can't deliver more :< */ 409 return; 410 } 411 stream_no = chk->rec.data.stream_number; 412 nxt_todel = asoc->strmin[stream_no].last_sequence_delivered + 1; 413 if (nxt_todel != chk->rec.data.stream_seq && 414 (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) { 415 /* 416 * Not the next sequence to deliver in its stream OR 417 * unordered 418 */ 419 return; 420 } 421 if (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) { 422 423 control = sctp_build_readq_entry_chk(stcb, chk); 424 if (control == NULL) { 425 /* out of memory? */ 426 return; 427 } 428 /* save it off for our future deliveries */ 429 stcb->asoc.control_pdapi = control; 430 if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) 431 end = 1; 432 else 433 end = 0; 434 sctp_mark_non_revokable(asoc, chk->rec.data.TSN_seq); 435 sctp_add_to_readq(stcb->sctp_ep, 436 stcb, control, &stcb->sctp_socket->so_rcv, end, 437 SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED); 438 cntDel++; 439 } else { 440 if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) 441 end = 1; 442 else 443 end = 0; 444 sctp_mark_non_revokable(asoc, chk->rec.data.TSN_seq); 445 if (sctp_append_to_readq(stcb->sctp_ep, stcb, 446 stcb->asoc.control_pdapi, 447 chk->data, end, chk->rec.data.TSN_seq, 448 &stcb->sctp_socket->so_rcv)) { 449 /* 450 * something is very wrong, either 451 * control_pdapi is NULL, or the tail_mbuf 452 * is corrupt, or there is a EOM already on 453 * the mbuf chain. 454 */ 455 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) { 456 goto abandon; 457 } else { 458 #ifdef INVARIANTS 459 if ((stcb->asoc.control_pdapi == NULL) || (stcb->asoc.control_pdapi->tail_mbuf == NULL)) { 460 panic("This should not happen control_pdapi NULL?"); 461 } 462 /* if we did not panic, it was a EOM */ 463 panic("Bad chunking ??"); 464 #else 465 if ((stcb->asoc.control_pdapi == NULL) || (stcb->asoc.control_pdapi->tail_mbuf == NULL)) { 466 SCTP_PRINTF("This should not happen control_pdapi NULL?\n"); 467 } 468 SCTP_PRINTF("Bad chunking ??\n"); 469 SCTP_PRINTF("Dumping re-assembly queue this will probably hose the association\n"); 470 471 #endif 472 goto abandon; 473 } 474 } 475 cntDel++; 476 } 477 /* pull it we did it */ 478 TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next); 479 if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) { 480 asoc->fragmented_delivery_inprogress = 0; 481 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) { 482 asoc->strmin[stream_no].last_sequence_delivered++; 483 } 484 if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0) { 485 SCTP_STAT_INCR_COUNTER64(sctps_reasmusrmsgs); 486 } 487 } else if (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) { 488 /* 489 * turn the flag back on since we just delivered 490 * yet another one. 491 */ 492 asoc->fragmented_delivery_inprogress = 1; 493 } 494 asoc->tsn_of_pdapi_last_delivered = chk->rec.data.TSN_seq; 495 asoc->last_flags_delivered = chk->rec.data.rcv_flags; 496 asoc->last_strm_seq_delivered = chk->rec.data.stream_seq; 497 asoc->last_strm_no_delivered = chk->rec.data.stream_number; 498 499 asoc->tsn_last_delivered = chk->rec.data.TSN_seq; 500 asoc->size_on_reasm_queue -= chk->send_size; 501 sctp_ucount_decr(asoc->cnt_on_reasm_queue); 502 /* free up the chk */ 503 chk->data = NULL; 504 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 505 506 if (asoc->fragmented_delivery_inprogress == 0) { 507 /* 508 * Now lets see if we can deliver the next one on 509 * the stream 510 */ 511 struct sctp_stream_in *strm; 512 513 strm = &asoc->strmin[stream_no]; 514 nxt_todel = strm->last_sequence_delivered + 1; 515 TAILQ_FOREACH_SAFE(ctl, &strm->inqueue, next, nctl) { 516 /* Deliver more if we can. */ 517 if (nxt_todel == ctl->sinfo_ssn) { 518 TAILQ_REMOVE(&strm->inqueue, ctl, next); 519 asoc->size_on_all_streams -= ctl->length; 520 sctp_ucount_decr(asoc->cnt_on_all_streams); 521 strm->last_sequence_delivered++; 522 sctp_mark_non_revokable(asoc, ctl->sinfo_tsn); 523 sctp_add_to_readq(stcb->sctp_ep, stcb, 524 ctl, 525 &stcb->sctp_socket->so_rcv, 1, 526 SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED); 527 } else { 528 break; 529 } 530 nxt_todel = strm->last_sequence_delivered + 1; 531 } 532 break; 533 } 534 } 535 } 536 537 /* 538 * Queue the chunk either right into the socket buffer if it is the next one 539 * to go OR put it in the correct place in the delivery queue. If we do 540 * append to the so_buf, keep doing so until we are out of order. One big 541 * question still remains, what to do when the socket buffer is FULL?? 542 */ 543 static void 544 sctp_queue_data_to_stream(struct sctp_tcb *stcb, struct sctp_association *asoc, 545 struct sctp_queued_to_read *control, int *abort_flag) 546 { 547 /* 548 * FIX-ME maybe? What happens when the ssn wraps? If we are getting 549 * all the data in one stream this could happen quite rapidly. One 550 * could use the TSN to keep track of things, but this scheme breaks 551 * down in the other type of stream useage that could occur. Send a 552 * single msg to stream 0, send 4Billion messages to stream 1, now 553 * send a message to stream 0. You have a situation where the TSN 554 * has wrapped but not in the stream. Is this worth worrying about 555 * or should we just change our queue sort at the bottom to be by 556 * TSN. 557 * 558 * Could it also be legal for a peer to send ssn 1 with TSN 2 and ssn 2 559 * with TSN 1? If the peer is doing some sort of funky TSN/SSN 560 * assignment this could happen... and I don't see how this would be 561 * a violation. So for now I am undecided an will leave the sort by 562 * SSN alone. Maybe a hybred approach is the answer 563 * 564 */ 565 struct sctp_stream_in *strm; 566 struct sctp_queued_to_read *at; 567 int queue_needed; 568 uint16_t nxt_todel; 569 struct mbuf *op_err; 570 char msg[SCTP_DIAG_INFO_LEN]; 571 572 queue_needed = 1; 573 asoc->size_on_all_streams += control->length; 574 sctp_ucount_incr(asoc->cnt_on_all_streams); 575 strm = &asoc->strmin[control->sinfo_stream]; 576 nxt_todel = strm->last_sequence_delivered + 1; 577 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { 578 sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_INTO_STRD); 579 } 580 SCTPDBG(SCTP_DEBUG_INDATA1, 581 "queue to stream called for ssn:%u lastdel:%u nxt:%u\n", 582 (uint32_t) control->sinfo_stream, 583 (uint32_t) strm->last_sequence_delivered, 584 (uint32_t) nxt_todel); 585 if (SCTP_SSN_GE(strm->last_sequence_delivered, control->sinfo_ssn)) { 586 /* The incoming sseq is behind where we last delivered? */ 587 SCTPDBG(SCTP_DEBUG_INDATA1, "Duplicate S-SEQ:%d delivered:%d from peer, Abort association\n", 588 control->sinfo_ssn, strm->last_sequence_delivered); 589 protocol_error: 590 /* 591 * throw it in the stream so it gets cleaned up in 592 * association destruction 593 */ 594 TAILQ_INSERT_HEAD(&strm->inqueue, control, next); 595 snprintf(msg, sizeof(msg), "Delivered SSN=%4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", 596 strm->last_sequence_delivered, control->sinfo_tsn, 597 control->sinfo_stream, control->sinfo_ssn); 598 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 599 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_1; 600 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 601 *abort_flag = 1; 602 return; 603 604 } 605 if (nxt_todel == control->sinfo_ssn) { 606 /* can be delivered right away? */ 607 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { 608 sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_IMMED_DEL); 609 } 610 /* EY it wont be queued if it could be delivered directly */ 611 queue_needed = 0; 612 asoc->size_on_all_streams -= control->length; 613 sctp_ucount_decr(asoc->cnt_on_all_streams); 614 strm->last_sequence_delivered++; 615 616 sctp_mark_non_revokable(asoc, control->sinfo_tsn); 617 sctp_add_to_readq(stcb->sctp_ep, stcb, 618 control, 619 &stcb->sctp_socket->so_rcv, 1, 620 SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED); 621 TAILQ_FOREACH_SAFE(control, &strm->inqueue, next, at) { 622 /* all delivered */ 623 nxt_todel = strm->last_sequence_delivered + 1; 624 if (nxt_todel == control->sinfo_ssn) { 625 TAILQ_REMOVE(&strm->inqueue, control, next); 626 asoc->size_on_all_streams -= control->length; 627 sctp_ucount_decr(asoc->cnt_on_all_streams); 628 strm->last_sequence_delivered++; 629 /* 630 * We ignore the return of deliver_data here 631 * since we always can hold the chunk on the 632 * d-queue. And we have a finite number that 633 * can be delivered from the strq. 634 */ 635 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { 636 sctp_log_strm_del(control, NULL, 637 SCTP_STR_LOG_FROM_IMMED_DEL); 638 } 639 sctp_mark_non_revokable(asoc, control->sinfo_tsn); 640 sctp_add_to_readq(stcb->sctp_ep, stcb, 641 control, 642 &stcb->sctp_socket->so_rcv, 1, 643 SCTP_READ_LOCK_NOT_HELD, 644 SCTP_SO_NOT_LOCKED); 645 continue; 646 } 647 break; 648 } 649 } 650 if (queue_needed) { 651 /* 652 * Ok, we did not deliver this guy, find the correct place 653 * to put it on the queue. 654 */ 655 if (SCTP_TSN_GE(asoc->cumulative_tsn, control->sinfo_tsn)) { 656 goto protocol_error; 657 } 658 if (TAILQ_EMPTY(&strm->inqueue)) { 659 /* Empty queue */ 660 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { 661 sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_INSERT_HD); 662 } 663 TAILQ_INSERT_HEAD(&strm->inqueue, control, next); 664 } else { 665 TAILQ_FOREACH(at, &strm->inqueue, next) { 666 if (SCTP_SSN_GT(at->sinfo_ssn, control->sinfo_ssn)) { 667 /* 668 * one in queue is bigger than the 669 * new one, insert before this one 670 */ 671 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { 672 sctp_log_strm_del(control, at, 673 SCTP_STR_LOG_FROM_INSERT_MD); 674 } 675 TAILQ_INSERT_BEFORE(at, control, next); 676 break; 677 } else if (at->sinfo_ssn == control->sinfo_ssn) { 678 /* 679 * Gak, He sent me a duplicate str 680 * seq number 681 */ 682 /* 683 * foo bar, I guess I will just free 684 * this new guy, should we abort 685 * too? FIX ME MAYBE? Or it COULD be 686 * that the SSN's have wrapped. 687 * Maybe I should compare to TSN 688 * somehow... sigh for now just blow 689 * away the chunk! 690 */ 691 692 if (control->data) 693 sctp_m_freem(control->data); 694 control->data = NULL; 695 asoc->size_on_all_streams -= control->length; 696 sctp_ucount_decr(asoc->cnt_on_all_streams); 697 if (control->whoFrom) { 698 sctp_free_remote_addr(control->whoFrom); 699 control->whoFrom = NULL; 700 } 701 sctp_free_a_readq(stcb, control); 702 return; 703 } else { 704 if (TAILQ_NEXT(at, next) == NULL) { 705 /* 706 * We are at the end, insert 707 * it after this one 708 */ 709 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { 710 sctp_log_strm_del(control, at, 711 SCTP_STR_LOG_FROM_INSERT_TL); 712 } 713 TAILQ_INSERT_AFTER(&strm->inqueue, 714 at, control, next); 715 break; 716 } 717 } 718 } 719 } 720 } 721 } 722 723 /* 724 * Returns two things: You get the total size of the deliverable parts of the 725 * first fragmented message on the reassembly queue. And you get a 1 back if 726 * all of the message is ready or a 0 back if the message is still incomplete 727 */ 728 static int 729 sctp_is_all_msg_on_reasm(struct sctp_association *asoc, uint32_t * t_size) 730 { 731 struct sctp_tmit_chunk *chk; 732 uint32_t tsn; 733 734 *t_size = 0; 735 chk = TAILQ_FIRST(&asoc->reasmqueue); 736 if (chk == NULL) { 737 /* nothing on the queue */ 738 return (0); 739 } 740 if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0) { 741 /* Not a first on the queue */ 742 return (0); 743 } 744 tsn = chk->rec.data.TSN_seq; 745 TAILQ_FOREACH(chk, &asoc->reasmqueue, sctp_next) { 746 if (tsn != chk->rec.data.TSN_seq) { 747 return (0); 748 } 749 *t_size += chk->send_size; 750 if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) { 751 return (1); 752 } 753 tsn++; 754 } 755 return (0); 756 } 757 758 static void 759 sctp_deliver_reasm_check(struct sctp_tcb *stcb, struct sctp_association *asoc) 760 { 761 struct sctp_tmit_chunk *chk; 762 uint16_t nxt_todel; 763 uint32_t tsize, pd_point; 764 765 doit_again: 766 chk = TAILQ_FIRST(&asoc->reasmqueue); 767 if (chk == NULL) { 768 /* Huh? */ 769 asoc->size_on_reasm_queue = 0; 770 asoc->cnt_on_reasm_queue = 0; 771 return; 772 } 773 if (asoc->fragmented_delivery_inprogress == 0) { 774 nxt_todel = 775 asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered + 1; 776 if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) && 777 (nxt_todel == chk->rec.data.stream_seq || 778 (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED))) { 779 /* 780 * Yep the first one is here and its ok to deliver 781 * but should we? 782 */ 783 if (stcb->sctp_socket) { 784 pd_point = min(SCTP_SB_LIMIT_RCV(stcb->sctp_socket) >> SCTP_PARTIAL_DELIVERY_SHIFT, 785 stcb->sctp_ep->partial_delivery_point); 786 } else { 787 pd_point = stcb->sctp_ep->partial_delivery_point; 788 } 789 if (sctp_is_all_msg_on_reasm(asoc, &tsize) || (tsize >= pd_point)) { 790 /* 791 * Yes, we setup to start reception, by 792 * backing down the TSN just in case we 793 * can't deliver. If we 794 */ 795 asoc->fragmented_delivery_inprogress = 1; 796 asoc->tsn_last_delivered = 797 chk->rec.data.TSN_seq - 1; 798 asoc->str_of_pdapi = 799 chk->rec.data.stream_number; 800 asoc->ssn_of_pdapi = chk->rec.data.stream_seq; 801 asoc->pdapi_ppid = chk->rec.data.payloadtype; 802 asoc->fragment_flags = chk->rec.data.rcv_flags; 803 sctp_service_reassembly(stcb, asoc); 804 } 805 } 806 } else { 807 /* 808 * Service re-assembly will deliver stream data queued at 809 * the end of fragmented delivery.. but it wont know to go 810 * back and call itself again... we do that here with the 811 * got doit_again 812 */ 813 sctp_service_reassembly(stcb, asoc); 814 if (asoc->fragmented_delivery_inprogress == 0) { 815 /* 816 * finished our Fragmented delivery, could be more 817 * waiting? 818 */ 819 goto doit_again; 820 } 821 } 822 } 823 824 /* 825 * Dump onto the re-assembly queue, in its proper place. After dumping on the 826 * queue, see if anthing can be delivered. If so pull it off (or as much as 827 * we can. If we run out of space then we must dump what we can and set the 828 * appropriate flag to say we queued what we could. 829 */ 830 static void 831 sctp_queue_data_for_reasm(struct sctp_tcb *stcb, struct sctp_association *asoc, 832 struct sctp_tmit_chunk *chk, int *abort_flag) 833 { 834 struct mbuf *op_err; 835 char msg[SCTP_DIAG_INFO_LEN]; 836 uint32_t cum_ackp1, prev_tsn, post_tsn; 837 struct sctp_tmit_chunk *at, *prev, *next; 838 839 prev = next = NULL; 840 cum_ackp1 = asoc->tsn_last_delivered + 1; 841 if (TAILQ_EMPTY(&asoc->reasmqueue)) { 842 /* This is the first one on the queue */ 843 TAILQ_INSERT_HEAD(&asoc->reasmqueue, chk, sctp_next); 844 /* 845 * we do not check for delivery of anything when only one 846 * fragment is here 847 */ 848 asoc->size_on_reasm_queue = chk->send_size; 849 sctp_ucount_incr(asoc->cnt_on_reasm_queue); 850 if (chk->rec.data.TSN_seq == cum_ackp1) { 851 if (asoc->fragmented_delivery_inprogress == 0 && 852 (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) != 853 SCTP_DATA_FIRST_FRAG) { 854 /* 855 * An empty queue, no delivery inprogress, 856 * we hit the next one and it does NOT have 857 * a FIRST fragment mark. 858 */ 859 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, its not first, no fragmented delivery in progress\n"); 860 snprintf(msg, sizeof(msg), 861 "Expected B-bit for TSN=%8.8x, SID=%4.4x, SSN=%4.4x", 862 chk->rec.data.TSN_seq, 863 chk->rec.data.stream_number, 864 chk->rec.data.stream_seq); 865 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 866 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_2; 867 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 868 *abort_flag = 1; 869 } else if (asoc->fragmented_delivery_inprogress && 870 (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == SCTP_DATA_FIRST_FRAG) { 871 /* 872 * We are doing a partial delivery and the 873 * NEXT chunk MUST be either the LAST or 874 * MIDDLE fragment NOT a FIRST 875 */ 876 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it IS a first and fragmented delivery in progress\n"); 877 snprintf(msg, sizeof(msg), 878 "Didn't expect B-bit for TSN=%8.8x, SID=%4.4x, SSN=%4.4x", 879 chk->rec.data.TSN_seq, 880 chk->rec.data.stream_number, 881 chk->rec.data.stream_seq); 882 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 883 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_3; 884 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 885 *abort_flag = 1; 886 } else if (asoc->fragmented_delivery_inprogress) { 887 /* 888 * Here we are ok with a MIDDLE or LAST 889 * piece 890 */ 891 if (chk->rec.data.stream_number != 892 asoc->str_of_pdapi) { 893 /* Got to be the right STR No */ 894 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it IS not same stream number %d vs %d\n", 895 chk->rec.data.stream_number, 896 asoc->str_of_pdapi); 897 snprintf(msg, sizeof(msg), 898 "Expected SID=%4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", 899 asoc->str_of_pdapi, 900 chk->rec.data.TSN_seq, 901 chk->rec.data.stream_number, 902 chk->rec.data.stream_seq); 903 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 904 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_4; 905 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 906 *abort_flag = 1; 907 } else if ((asoc->fragment_flags & SCTP_DATA_UNORDERED) != 908 SCTP_DATA_UNORDERED && 909 chk->rec.data.stream_seq != asoc->ssn_of_pdapi) { 910 /* Got to be the right STR Seq */ 911 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it IS not same stream seq %d vs %d\n", 912 chk->rec.data.stream_seq, 913 asoc->ssn_of_pdapi); 914 snprintf(msg, sizeof(msg), 915 "Expected SSN=%4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", 916 asoc->ssn_of_pdapi, 917 chk->rec.data.TSN_seq, 918 chk->rec.data.stream_number, 919 chk->rec.data.stream_seq); 920 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 921 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_5; 922 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 923 *abort_flag = 1; 924 } 925 } 926 } 927 return; 928 } 929 /* Find its place */ 930 TAILQ_FOREACH(at, &asoc->reasmqueue, sctp_next) { 931 if (SCTP_TSN_GT(at->rec.data.TSN_seq, chk->rec.data.TSN_seq)) { 932 /* 933 * one in queue is bigger than the new one, insert 934 * before this one 935 */ 936 /* A check */ 937 asoc->size_on_reasm_queue += chk->send_size; 938 sctp_ucount_incr(asoc->cnt_on_reasm_queue); 939 next = at; 940 TAILQ_INSERT_BEFORE(at, chk, sctp_next); 941 break; 942 } else if (at->rec.data.TSN_seq == chk->rec.data.TSN_seq) { 943 /* Gak, He sent me a duplicate str seq number */ 944 /* 945 * foo bar, I guess I will just free this new guy, 946 * should we abort too? FIX ME MAYBE? Or it COULD be 947 * that the SSN's have wrapped. Maybe I should 948 * compare to TSN somehow... sigh for now just blow 949 * away the chunk! 950 */ 951 if (chk->data) { 952 sctp_m_freem(chk->data); 953 chk->data = NULL; 954 } 955 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 956 return; 957 } else { 958 prev = at; 959 if (TAILQ_NEXT(at, sctp_next) == NULL) { 960 /* 961 * We are at the end, insert it after this 962 * one 963 */ 964 /* check it first */ 965 asoc->size_on_reasm_queue += chk->send_size; 966 sctp_ucount_incr(asoc->cnt_on_reasm_queue); 967 TAILQ_INSERT_AFTER(&asoc->reasmqueue, at, chk, sctp_next); 968 break; 969 } 970 } 971 } 972 /* Now the audits */ 973 if (prev) { 974 prev_tsn = chk->rec.data.TSN_seq - 1; 975 if (prev_tsn == prev->rec.data.TSN_seq) { 976 /* 977 * Ok the one I am dropping onto the end is the 978 * NEXT. A bit of valdiation here. 979 */ 980 if ((prev->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) == 981 SCTP_DATA_FIRST_FRAG || 982 (prev->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) == 983 SCTP_DATA_MIDDLE_FRAG) { 984 /* 985 * Insert chk MUST be a MIDDLE or LAST 986 * fragment 987 */ 988 if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) == 989 SCTP_DATA_FIRST_FRAG) { 990 SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - It can be a midlle or last but not a first\n"); 991 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it's a FIRST!\n"); 992 snprintf(msg, sizeof(msg), 993 "Can't handle B-bit, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", 994 chk->rec.data.TSN_seq, 995 chk->rec.data.stream_number, 996 chk->rec.data.stream_seq); 997 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 998 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_6; 999 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 1000 *abort_flag = 1; 1001 return; 1002 } 1003 if (chk->rec.data.stream_number != 1004 prev->rec.data.stream_number) { 1005 /* 1006 * Huh, need the correct STR here, 1007 * they must be the same. 1008 */ 1009 SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - Gak, Evil plot, sid:%d not the same as at:%d\n", 1010 chk->rec.data.stream_number, 1011 prev->rec.data.stream_number); 1012 snprintf(msg, sizeof(msg), 1013 "Expect SID=%4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", 1014 prev->rec.data.stream_number, 1015 chk->rec.data.TSN_seq, 1016 chk->rec.data.stream_number, 1017 chk->rec.data.stream_seq); 1018 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 1019 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_7; 1020 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 1021 *abort_flag = 1; 1022 return; 1023 } 1024 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) != 1025 (prev->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) { 1026 /* 1027 * Huh, need the same ordering here, 1028 * they must be the same. 1029 */ 1030 SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - Gak, Evil plot, U-bit not constant\n"); 1031 snprintf(msg, sizeof(msg), 1032 "Expect U-bit=%d for TSN=%8.8x, got U-bit=%d", 1033 (prev->rec.data.rcv_flags & SCTP_DATA_UNORDERED) ? 1 : 0, 1034 chk->rec.data.TSN_seq, 1035 (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) ? 1 : 0); 1036 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 1037 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_7; 1038 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 1039 *abort_flag = 1; 1040 return; 1041 } 1042 if ((prev->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0 && 1043 chk->rec.data.stream_seq != 1044 prev->rec.data.stream_seq) { 1045 /* 1046 * Huh, need the correct STR here, 1047 * they must be the same. 1048 */ 1049 SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - Gak, Evil plot, sseq:%d not the same as at:%d\n", 1050 chk->rec.data.stream_seq, 1051 prev->rec.data.stream_seq); 1052 snprintf(msg, sizeof(msg), 1053 "Expect SSN=%4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", 1054 prev->rec.data.stream_seq, 1055 chk->rec.data.TSN_seq, 1056 chk->rec.data.stream_number, 1057 chk->rec.data.stream_seq); 1058 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 1059 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_8; 1060 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 1061 *abort_flag = 1; 1062 return; 1063 } 1064 } else if ((prev->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) == 1065 SCTP_DATA_LAST_FRAG) { 1066 /* Insert chk MUST be a FIRST */ 1067 if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) != 1068 SCTP_DATA_FIRST_FRAG) { 1069 SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - Gak, evil plot, its not FIRST and it must be!\n"); 1070 snprintf(msg, sizeof(msg), 1071 "Expect B-bit, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", 1072 chk->rec.data.TSN_seq, 1073 chk->rec.data.stream_number, 1074 chk->rec.data.stream_seq); 1075 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 1076 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_9; 1077 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 1078 *abort_flag = 1; 1079 return; 1080 } 1081 } 1082 } 1083 } 1084 if (next) { 1085 post_tsn = chk->rec.data.TSN_seq + 1; 1086 if (post_tsn == next->rec.data.TSN_seq) { 1087 /* 1088 * Ok the one I am inserting ahead of is my NEXT 1089 * one. A bit of valdiation here. 1090 */ 1091 if (next->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) { 1092 /* Insert chk MUST be a last fragment */ 1093 if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) 1094 != SCTP_DATA_LAST_FRAG) { 1095 SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Next is FIRST, we must be LAST\n"); 1096 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, its not a last!\n"); 1097 snprintf(msg, sizeof(msg), 1098 "Expect only E-bit, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", 1099 chk->rec.data.TSN_seq, 1100 chk->rec.data.stream_number, 1101 chk->rec.data.stream_seq); 1102 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 1103 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_10; 1104 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 1105 *abort_flag = 1; 1106 return; 1107 } 1108 } else if ((next->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) == 1109 SCTP_DATA_MIDDLE_FRAG || 1110 (next->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) == 1111 SCTP_DATA_LAST_FRAG) { 1112 /* 1113 * Insert chk CAN be MIDDLE or FIRST NOT 1114 * LAST 1115 */ 1116 if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) == 1117 SCTP_DATA_LAST_FRAG) { 1118 SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Next is a MIDDLE/LAST\n"); 1119 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, new prev chunk is a LAST\n"); 1120 snprintf(msg, sizeof(msg), 1121 "Didn't expect E-bit, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", 1122 chk->rec.data.TSN_seq, 1123 chk->rec.data.stream_number, 1124 chk->rec.data.stream_seq); 1125 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 1126 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_11; 1127 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 1128 *abort_flag = 1; 1129 return; 1130 } 1131 if (chk->rec.data.stream_number != 1132 next->rec.data.stream_number) { 1133 /* 1134 * Huh, need the correct STR here, 1135 * they must be the same. 1136 */ 1137 SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Gak, Evil plot, ssn:%d not the same as at:%d\n", 1138 chk->rec.data.stream_number, 1139 next->rec.data.stream_number); 1140 snprintf(msg, sizeof(msg), 1141 "Required SID %4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", 1142 next->rec.data.stream_number, 1143 chk->rec.data.TSN_seq, 1144 chk->rec.data.stream_number, 1145 chk->rec.data.stream_seq); 1146 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 1147 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_12; 1148 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 1149 *abort_flag = 1; 1150 return; 1151 } 1152 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) != 1153 (next->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) { 1154 /* 1155 * Huh, need the same ordering here, 1156 * they must be the same. 1157 */ 1158 SCTPDBG(SCTP_DEBUG_INDATA1, "Next check - Gak, Evil plot, U-bit not constant\n"); 1159 snprintf(msg, sizeof(msg), 1160 "Expect U-bit=%d for TSN=%8.8x, got U-bit=%d", 1161 (next->rec.data.rcv_flags & SCTP_DATA_UNORDERED) ? 1 : 0, 1162 chk->rec.data.TSN_seq, 1163 (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) ? 1 : 0); 1164 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 1165 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_12; 1166 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 1167 *abort_flag = 1; 1168 return; 1169 } 1170 if ((next->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0 && 1171 chk->rec.data.stream_seq != 1172 next->rec.data.stream_seq) { 1173 /* 1174 * Huh, need the correct STR here, 1175 * they must be the same. 1176 */ 1177 SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Gak, Evil plot, sseq:%d not the same as at:%d\n", 1178 chk->rec.data.stream_seq, 1179 next->rec.data.stream_seq); 1180 snprintf(msg, sizeof(msg), 1181 "Required SSN %4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", 1182 next->rec.data.stream_seq, 1183 chk->rec.data.TSN_seq, 1184 chk->rec.data.stream_number, 1185 chk->rec.data.stream_seq); 1186 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 1187 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_13; 1188 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 1189 *abort_flag = 1; 1190 return; 1191 } 1192 } 1193 } 1194 } 1195 /* Do we need to do some delivery? check */ 1196 sctp_deliver_reasm_check(stcb, asoc); 1197 } 1198 1199 /* 1200 * This is an unfortunate routine. It checks to make sure a evil guy is not 1201 * stuffing us full of bad packet fragments. A broken peer could also do this 1202 * but this is doubtful. It is to bad I must worry about evil crackers sigh 1203 * :< more cycles. 1204 */ 1205 static int 1206 sctp_does_tsn_belong_to_reasm(struct sctp_association *asoc, 1207 uint32_t TSN_seq) 1208 { 1209 struct sctp_tmit_chunk *at; 1210 uint32_t tsn_est; 1211 1212 TAILQ_FOREACH(at, &asoc->reasmqueue, sctp_next) { 1213 if (SCTP_TSN_GT(TSN_seq, at->rec.data.TSN_seq)) { 1214 /* is it one bigger? */ 1215 tsn_est = at->rec.data.TSN_seq + 1; 1216 if (tsn_est == TSN_seq) { 1217 /* yep. It better be a last then */ 1218 if ((at->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) != 1219 SCTP_DATA_LAST_FRAG) { 1220 /* 1221 * Ok this guy belongs next to a guy 1222 * that is NOT last, it should be a 1223 * middle/last, not a complete 1224 * chunk. 1225 */ 1226 return (1); 1227 } else { 1228 /* 1229 * This guy is ok since its a LAST 1230 * and the new chunk is a fully 1231 * self- contained one. 1232 */ 1233 return (0); 1234 } 1235 } 1236 } else if (TSN_seq == at->rec.data.TSN_seq) { 1237 /* Software error since I have a dup? */ 1238 return (1); 1239 } else { 1240 /* 1241 * Ok, 'at' is larger than new chunk but does it 1242 * need to be right before it. 1243 */ 1244 tsn_est = TSN_seq + 1; 1245 if (tsn_est == at->rec.data.TSN_seq) { 1246 /* Yep, It better be a first */ 1247 if ((at->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) != 1248 SCTP_DATA_FIRST_FRAG) { 1249 return (1); 1250 } else { 1251 return (0); 1252 } 1253 } 1254 } 1255 } 1256 return (0); 1257 } 1258 1259 static int 1260 sctp_process_a_data_chunk(struct sctp_tcb *stcb, struct sctp_association *asoc, 1261 struct mbuf **m, int offset, struct sctp_data_chunk *ch, int chk_length, 1262 struct sctp_nets *net, uint32_t * high_tsn, int *abort_flag, 1263 int *break_flag, int last_chunk) 1264 { 1265 /* Process a data chunk */ 1266 /* struct sctp_tmit_chunk *chk; */ 1267 struct sctp_tmit_chunk *chk; 1268 uint32_t tsn, gap; 1269 struct mbuf *dmbuf; 1270 int the_len; 1271 int need_reasm_check = 0; 1272 uint16_t strmno, strmseq; 1273 struct mbuf *op_err; 1274 char msg[SCTP_DIAG_INFO_LEN]; 1275 struct sctp_queued_to_read *control; 1276 int ordered; 1277 uint32_t protocol_id; 1278 uint8_t chunk_flags; 1279 struct sctp_stream_reset_list *liste; 1280 1281 chk = NULL; 1282 tsn = ntohl(ch->dp.tsn); 1283 chunk_flags = ch->ch.chunk_flags; 1284 if ((chunk_flags & SCTP_DATA_SACK_IMMEDIATELY) == SCTP_DATA_SACK_IMMEDIATELY) { 1285 asoc->send_sack = 1; 1286 } 1287 protocol_id = ch->dp.protocol_id; 1288 ordered = ((chunk_flags & SCTP_DATA_UNORDERED) == 0); 1289 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 1290 sctp_log_map(tsn, asoc->cumulative_tsn, asoc->highest_tsn_inside_map, SCTP_MAP_TSN_ENTERS); 1291 } 1292 if (stcb == NULL) { 1293 return (0); 1294 } 1295 SCTP_LTRACE_CHK(stcb->sctp_ep, stcb, ch->ch.chunk_type, tsn); 1296 if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 1297 /* It is a duplicate */ 1298 SCTP_STAT_INCR(sctps_recvdupdata); 1299 if (asoc->numduptsns < SCTP_MAX_DUP_TSNS) { 1300 /* Record a dup for the next outbound sack */ 1301 asoc->dup_tsns[asoc->numduptsns] = tsn; 1302 asoc->numduptsns++; 1303 } 1304 asoc->send_sack = 1; 1305 return (0); 1306 } 1307 /* Calculate the number of TSN's between the base and this TSN */ 1308 SCTP_CALC_TSN_TO_GAP(gap, tsn, asoc->mapping_array_base_tsn); 1309 if (gap >= (SCTP_MAPPING_ARRAY << 3)) { 1310 /* Can't hold the bit in the mapping at max array, toss it */ 1311 return (0); 1312 } 1313 if (gap >= (uint32_t) (asoc->mapping_array_size << 3)) { 1314 SCTP_TCB_LOCK_ASSERT(stcb); 1315 if (sctp_expand_mapping_array(asoc, gap)) { 1316 /* Can't expand, drop it */ 1317 return (0); 1318 } 1319 } 1320 if (SCTP_TSN_GT(tsn, *high_tsn)) { 1321 *high_tsn = tsn; 1322 } 1323 /* See if we have received this one already */ 1324 if (SCTP_IS_TSN_PRESENT(asoc->mapping_array, gap) || 1325 SCTP_IS_TSN_PRESENT(asoc->nr_mapping_array, gap)) { 1326 SCTP_STAT_INCR(sctps_recvdupdata); 1327 if (asoc->numduptsns < SCTP_MAX_DUP_TSNS) { 1328 /* Record a dup for the next outbound sack */ 1329 asoc->dup_tsns[asoc->numduptsns] = tsn; 1330 asoc->numduptsns++; 1331 } 1332 asoc->send_sack = 1; 1333 return (0); 1334 } 1335 /* 1336 * Check to see about the GONE flag, duplicates would cause a sack 1337 * to be sent up above 1338 */ 1339 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 1340 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || 1341 (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET))) { 1342 /* 1343 * wait a minute, this guy is gone, there is no longer a 1344 * receiver. Send peer an ABORT! 1345 */ 1346 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 1347 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 1348 *abort_flag = 1; 1349 return (0); 1350 } 1351 /* 1352 * Now before going further we see if there is room. If NOT then we 1353 * MAY let one through only IF this TSN is the one we are waiting 1354 * for on a partial delivery API. 1355 */ 1356 1357 /* now do the tests */ 1358 if (((asoc->cnt_on_all_streams + 1359 asoc->cnt_on_reasm_queue + 1360 asoc->cnt_msg_on_sb) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue)) || 1361 (((int)asoc->my_rwnd) <= 0)) { 1362 /* 1363 * When we have NO room in the rwnd we check to make sure 1364 * the reader is doing its job... 1365 */ 1366 if (stcb->sctp_socket->so_rcv.sb_cc) { 1367 /* some to read, wake-up */ 1368 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1369 struct socket *so; 1370 1371 so = SCTP_INP_SO(stcb->sctp_ep); 1372 atomic_add_int(&stcb->asoc.refcnt, 1); 1373 SCTP_TCB_UNLOCK(stcb); 1374 SCTP_SOCKET_LOCK(so, 1); 1375 SCTP_TCB_LOCK(stcb); 1376 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1377 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1378 /* assoc was freed while we were unlocked */ 1379 SCTP_SOCKET_UNLOCK(so, 1); 1380 return (0); 1381 } 1382 #endif 1383 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 1384 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1385 SCTP_SOCKET_UNLOCK(so, 1); 1386 #endif 1387 } 1388 /* now is it in the mapping array of what we have accepted? */ 1389 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_map) && 1390 SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) { 1391 /* Nope not in the valid range dump it */ 1392 sctp_set_rwnd(stcb, asoc); 1393 if ((asoc->cnt_on_all_streams + 1394 asoc->cnt_on_reasm_queue + 1395 asoc->cnt_msg_on_sb) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue)) { 1396 SCTP_STAT_INCR(sctps_datadropchklmt); 1397 } else { 1398 SCTP_STAT_INCR(sctps_datadroprwnd); 1399 } 1400 *break_flag = 1; 1401 return (0); 1402 } 1403 } 1404 strmno = ntohs(ch->dp.stream_id); 1405 if (strmno >= asoc->streamincnt) { 1406 struct sctp_paramhdr *phdr; 1407 struct mbuf *mb; 1408 1409 mb = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) * 2), 1410 0, M_NOWAIT, 1, MT_DATA); 1411 if (mb != NULL) { 1412 /* add some space up front so prepend will work well */ 1413 SCTP_BUF_RESV_UF(mb, sizeof(struct sctp_chunkhdr)); 1414 phdr = mtod(mb, struct sctp_paramhdr *); 1415 /* 1416 * Error causes are just param's and this one has 1417 * two back to back phdr, one with the error type 1418 * and size, the other with the streamid and a rsvd 1419 */ 1420 SCTP_BUF_LEN(mb) = (sizeof(struct sctp_paramhdr) * 2); 1421 phdr->param_type = htons(SCTP_CAUSE_INVALID_STREAM); 1422 phdr->param_length = 1423 htons(sizeof(struct sctp_paramhdr) * 2); 1424 phdr++; 1425 /* We insert the stream in the type field */ 1426 phdr->param_type = ch->dp.stream_id; 1427 /* And set the length to 0 for the rsvd field */ 1428 phdr->param_length = 0; 1429 sctp_queue_op_err(stcb, mb); 1430 } 1431 SCTP_STAT_INCR(sctps_badsid); 1432 SCTP_TCB_LOCK_ASSERT(stcb); 1433 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap); 1434 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) { 1435 asoc->highest_tsn_inside_nr_map = tsn; 1436 } 1437 if (tsn == (asoc->cumulative_tsn + 1)) { 1438 /* Update cum-ack */ 1439 asoc->cumulative_tsn = tsn; 1440 } 1441 return (0); 1442 } 1443 /* 1444 * Before we continue lets validate that we are not being fooled by 1445 * an evil attacker. We can only have 4k chunks based on our TSN 1446 * spread allowed by the mapping array 512 * 8 bits, so there is no 1447 * way our stream sequence numbers could have wrapped. We of course 1448 * only validate the FIRST fragment so the bit must be set. 1449 */ 1450 strmseq = ntohs(ch->dp.stream_sequence); 1451 #ifdef SCTP_ASOCLOG_OF_TSNS 1452 SCTP_TCB_LOCK_ASSERT(stcb); 1453 if (asoc->tsn_in_at >= SCTP_TSN_LOG_SIZE) { 1454 asoc->tsn_in_at = 0; 1455 asoc->tsn_in_wrapped = 1; 1456 } 1457 asoc->in_tsnlog[asoc->tsn_in_at].tsn = tsn; 1458 asoc->in_tsnlog[asoc->tsn_in_at].strm = strmno; 1459 asoc->in_tsnlog[asoc->tsn_in_at].seq = strmseq; 1460 asoc->in_tsnlog[asoc->tsn_in_at].sz = chk_length; 1461 asoc->in_tsnlog[asoc->tsn_in_at].flgs = chunk_flags; 1462 asoc->in_tsnlog[asoc->tsn_in_at].stcb = (void *)stcb; 1463 asoc->in_tsnlog[asoc->tsn_in_at].in_pos = asoc->tsn_in_at; 1464 asoc->in_tsnlog[asoc->tsn_in_at].in_out = 1; 1465 asoc->tsn_in_at++; 1466 #endif 1467 if ((chunk_flags & SCTP_DATA_FIRST_FRAG) && 1468 (TAILQ_EMPTY(&asoc->resetHead)) && 1469 (chunk_flags & SCTP_DATA_UNORDERED) == 0 && 1470 SCTP_SSN_GE(asoc->strmin[strmno].last_sequence_delivered, strmseq)) { 1471 /* The incoming sseq is behind where we last delivered? */ 1472 SCTPDBG(SCTP_DEBUG_INDATA1, "EVIL/Broken-Dup S-SEQ:%d delivered:%d from peer, Abort!\n", 1473 strmseq, asoc->strmin[strmno].last_sequence_delivered); 1474 1475 snprintf(msg, sizeof(msg), "Delivered SSN=%4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", 1476 asoc->strmin[strmno].last_sequence_delivered, 1477 tsn, strmno, strmseq); 1478 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 1479 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_14; 1480 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 1481 *abort_flag = 1; 1482 return (0); 1483 } 1484 /************************************ 1485 * From here down we may find ch-> invalid 1486 * so its a good idea NOT to use it. 1487 *************************************/ 1488 1489 the_len = (chk_length - sizeof(struct sctp_data_chunk)); 1490 if (last_chunk == 0) { 1491 dmbuf = SCTP_M_COPYM(*m, 1492 (offset + sizeof(struct sctp_data_chunk)), 1493 the_len, M_NOWAIT); 1494 #ifdef SCTP_MBUF_LOGGING 1495 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 1496 sctp_log_mbc(dmbuf, SCTP_MBUF_ICOPY); 1497 } 1498 #endif 1499 } else { 1500 /* We can steal the last chunk */ 1501 int l_len; 1502 1503 dmbuf = *m; 1504 /* lop off the top part */ 1505 m_adj(dmbuf, (offset + sizeof(struct sctp_data_chunk))); 1506 if (SCTP_BUF_NEXT(dmbuf) == NULL) { 1507 l_len = SCTP_BUF_LEN(dmbuf); 1508 } else { 1509 /* 1510 * need to count up the size hopefully does not hit 1511 * this to often :-0 1512 */ 1513 struct mbuf *lat; 1514 1515 l_len = 0; 1516 for (lat = dmbuf; lat; lat = SCTP_BUF_NEXT(lat)) { 1517 l_len += SCTP_BUF_LEN(lat); 1518 } 1519 } 1520 if (l_len > the_len) { 1521 /* Trim the end round bytes off too */ 1522 m_adj(dmbuf, -(l_len - the_len)); 1523 } 1524 } 1525 if (dmbuf == NULL) { 1526 SCTP_STAT_INCR(sctps_nomem); 1527 return (0); 1528 } 1529 if ((chunk_flags & SCTP_DATA_NOT_FRAG) == SCTP_DATA_NOT_FRAG && 1530 asoc->fragmented_delivery_inprogress == 0 && 1531 TAILQ_EMPTY(&asoc->resetHead) && 1532 ((ordered == 0) || 1533 ((uint16_t) (asoc->strmin[strmno].last_sequence_delivered + 1) == strmseq && 1534 TAILQ_EMPTY(&asoc->strmin[strmno].inqueue)))) { 1535 /* Candidate for express delivery */ 1536 /* 1537 * Its not fragmented, No PD-API is up, Nothing in the 1538 * delivery queue, Its un-ordered OR ordered and the next to 1539 * deliver AND nothing else is stuck on the stream queue, 1540 * And there is room for it in the socket buffer. Lets just 1541 * stuff it up the buffer.... 1542 */ 1543 1544 /* It would be nice to avoid this copy if we could :< */ 1545 sctp_alloc_a_readq(stcb, control); 1546 sctp_build_readq_entry_mac(control, stcb, asoc->context, net, tsn, 1547 protocol_id, 1548 strmno, strmseq, 1549 chunk_flags, 1550 dmbuf); 1551 if (control == NULL) { 1552 goto failed_express_del; 1553 } 1554 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap); 1555 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) { 1556 asoc->highest_tsn_inside_nr_map = tsn; 1557 } 1558 sctp_add_to_readq(stcb->sctp_ep, stcb, 1559 control, &stcb->sctp_socket->so_rcv, 1560 1, SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED); 1561 1562 if ((chunk_flags & SCTP_DATA_UNORDERED) == 0) { 1563 /* for ordered, bump what we delivered */ 1564 asoc->strmin[strmno].last_sequence_delivered++; 1565 } 1566 SCTP_STAT_INCR(sctps_recvexpress); 1567 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { 1568 sctp_log_strm_del_alt(stcb, tsn, strmseq, strmno, 1569 SCTP_STR_LOG_FROM_EXPRS_DEL); 1570 } 1571 control = NULL; 1572 1573 goto finish_express_del; 1574 } 1575 failed_express_del: 1576 /* If we reach here this is a new chunk */ 1577 chk = NULL; 1578 control = NULL; 1579 /* Express for fragmented delivery? */ 1580 if ((asoc->fragmented_delivery_inprogress) && 1581 (stcb->asoc.control_pdapi) && 1582 (asoc->str_of_pdapi == strmno) && 1583 (asoc->ssn_of_pdapi == strmseq) 1584 ) { 1585 control = stcb->asoc.control_pdapi; 1586 if ((chunk_flags & SCTP_DATA_FIRST_FRAG) == SCTP_DATA_FIRST_FRAG) { 1587 /* Can't be another first? */ 1588 goto failed_pdapi_express_del; 1589 } 1590 if (tsn == (control->sinfo_tsn + 1)) { 1591 /* Yep, we can add it on */ 1592 int end = 0; 1593 1594 if (chunk_flags & SCTP_DATA_LAST_FRAG) { 1595 end = 1; 1596 } 1597 if (sctp_append_to_readq(stcb->sctp_ep, stcb, control, dmbuf, end, 1598 tsn, 1599 &stcb->sctp_socket->so_rcv)) { 1600 SCTP_PRINTF("Append fails end:%d\n", end); 1601 goto failed_pdapi_express_del; 1602 } 1603 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap); 1604 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) { 1605 asoc->highest_tsn_inside_nr_map = tsn; 1606 } 1607 SCTP_STAT_INCR(sctps_recvexpressm); 1608 asoc->tsn_last_delivered = tsn; 1609 asoc->fragment_flags = chunk_flags; 1610 asoc->tsn_of_pdapi_last_delivered = tsn; 1611 asoc->last_flags_delivered = chunk_flags; 1612 asoc->last_strm_seq_delivered = strmseq; 1613 asoc->last_strm_no_delivered = strmno; 1614 if (end) { 1615 /* clean up the flags and such */ 1616 asoc->fragmented_delivery_inprogress = 0; 1617 if ((chunk_flags & SCTP_DATA_UNORDERED) == 0) { 1618 asoc->strmin[strmno].last_sequence_delivered++; 1619 } 1620 stcb->asoc.control_pdapi = NULL; 1621 if (TAILQ_EMPTY(&asoc->reasmqueue) == 0) { 1622 /* 1623 * There could be another message 1624 * ready 1625 */ 1626 need_reasm_check = 1; 1627 } 1628 } 1629 control = NULL; 1630 goto finish_express_del; 1631 } 1632 } 1633 failed_pdapi_express_del: 1634 control = NULL; 1635 if (SCTP_BASE_SYSCTL(sctp_do_drain) == 0) { 1636 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap); 1637 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) { 1638 asoc->highest_tsn_inside_nr_map = tsn; 1639 } 1640 } else { 1641 SCTP_SET_TSN_PRESENT(asoc->mapping_array, gap); 1642 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_map)) { 1643 asoc->highest_tsn_inside_map = tsn; 1644 } 1645 } 1646 if ((chunk_flags & SCTP_DATA_NOT_FRAG) != SCTP_DATA_NOT_FRAG) { 1647 sctp_alloc_a_chunk(stcb, chk); 1648 if (chk == NULL) { 1649 /* No memory so we drop the chunk */ 1650 SCTP_STAT_INCR(sctps_nomem); 1651 if (last_chunk == 0) { 1652 /* we copied it, free the copy */ 1653 sctp_m_freem(dmbuf); 1654 } 1655 return (0); 1656 } 1657 chk->rec.data.TSN_seq = tsn; 1658 chk->no_fr_allowed = 0; 1659 chk->rec.data.stream_seq = strmseq; 1660 chk->rec.data.stream_number = strmno; 1661 chk->rec.data.payloadtype = protocol_id; 1662 chk->rec.data.context = stcb->asoc.context; 1663 chk->rec.data.doing_fast_retransmit = 0; 1664 chk->rec.data.rcv_flags = chunk_flags; 1665 chk->asoc = asoc; 1666 chk->send_size = the_len; 1667 chk->whoTo = net; 1668 atomic_add_int(&net->ref_count, 1); 1669 chk->data = dmbuf; 1670 } else { 1671 sctp_alloc_a_readq(stcb, control); 1672 sctp_build_readq_entry_mac(control, stcb, asoc->context, net, tsn, 1673 protocol_id, 1674 strmno, strmseq, 1675 chunk_flags, 1676 dmbuf); 1677 if (control == NULL) { 1678 /* No memory so we drop the chunk */ 1679 SCTP_STAT_INCR(sctps_nomem); 1680 if (last_chunk == 0) { 1681 /* we copied it, free the copy */ 1682 sctp_m_freem(dmbuf); 1683 } 1684 return (0); 1685 } 1686 control->length = the_len; 1687 } 1688 1689 /* Mark it as received */ 1690 /* Now queue it where it belongs */ 1691 if (control != NULL) { 1692 /* First a sanity check */ 1693 if (asoc->fragmented_delivery_inprogress) { 1694 /* 1695 * Ok, we have a fragmented delivery in progress if 1696 * this chunk is next to deliver OR belongs in our 1697 * view to the reassembly, the peer is evil or 1698 * broken. 1699 */ 1700 uint32_t estimate_tsn; 1701 1702 estimate_tsn = asoc->tsn_last_delivered + 1; 1703 if (TAILQ_EMPTY(&asoc->reasmqueue) && 1704 (estimate_tsn == control->sinfo_tsn)) { 1705 /* Evil/Broke peer */ 1706 sctp_m_freem(control->data); 1707 control->data = NULL; 1708 if (control->whoFrom) { 1709 sctp_free_remote_addr(control->whoFrom); 1710 control->whoFrom = NULL; 1711 } 1712 sctp_free_a_readq(stcb, control); 1713 snprintf(msg, sizeof(msg), "Reas. queue emtpy, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", 1714 tsn, strmno, strmseq); 1715 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 1716 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_15; 1717 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 1718 *abort_flag = 1; 1719 if (last_chunk) { 1720 *m = NULL; 1721 } 1722 return (0); 1723 } else { 1724 if (sctp_does_tsn_belong_to_reasm(asoc, control->sinfo_tsn)) { 1725 sctp_m_freem(control->data); 1726 control->data = NULL; 1727 if (control->whoFrom) { 1728 sctp_free_remote_addr(control->whoFrom); 1729 control->whoFrom = NULL; 1730 } 1731 sctp_free_a_readq(stcb, control); 1732 snprintf(msg, sizeof(msg), "PD ongoing, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", 1733 tsn, strmno, strmseq); 1734 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 1735 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_16; 1736 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 1737 *abort_flag = 1; 1738 if (last_chunk) { 1739 *m = NULL; 1740 } 1741 return (0); 1742 } 1743 } 1744 } else { 1745 /* No PDAPI running */ 1746 if (!TAILQ_EMPTY(&asoc->reasmqueue)) { 1747 /* 1748 * Reassembly queue is NOT empty validate 1749 * that this tsn does not need to be in 1750 * reasembly queue. If it does then our peer 1751 * is broken or evil. 1752 */ 1753 if (sctp_does_tsn_belong_to_reasm(asoc, control->sinfo_tsn)) { 1754 sctp_m_freem(control->data); 1755 control->data = NULL; 1756 if (control->whoFrom) { 1757 sctp_free_remote_addr(control->whoFrom); 1758 control->whoFrom = NULL; 1759 } 1760 sctp_free_a_readq(stcb, control); 1761 snprintf(msg, sizeof(msg), "No PD ongoing, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", 1762 tsn, strmno, strmseq); 1763 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 1764 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_17; 1765 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 1766 *abort_flag = 1; 1767 if (last_chunk) { 1768 *m = NULL; 1769 } 1770 return (0); 1771 } 1772 } 1773 } 1774 /* ok, if we reach here we have passed the sanity checks */ 1775 if (chunk_flags & SCTP_DATA_UNORDERED) { 1776 /* queue directly into socket buffer */ 1777 sctp_mark_non_revokable(asoc, control->sinfo_tsn); 1778 sctp_add_to_readq(stcb->sctp_ep, stcb, 1779 control, 1780 &stcb->sctp_socket->so_rcv, 1, SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED); 1781 } else { 1782 /* 1783 * Special check for when streams are resetting. We 1784 * could be more smart about this and check the 1785 * actual stream to see if it is not being reset.. 1786 * that way we would not create a HOLB when amongst 1787 * streams being reset and those not being reset. 1788 * 1789 * We take complete messages that have a stream reset 1790 * intervening (aka the TSN is after where our 1791 * cum-ack needs to be) off and put them on a 1792 * pending_reply_queue. The reassembly ones we do 1793 * not have to worry about since they are all sorted 1794 * and proceessed by TSN order. It is only the 1795 * singletons I must worry about. 1796 */ 1797 if (((liste = TAILQ_FIRST(&asoc->resetHead)) != NULL) && 1798 SCTP_TSN_GT(tsn, liste->tsn)) { 1799 /* 1800 * yep its past where we need to reset... go 1801 * ahead and queue it. 1802 */ 1803 if (TAILQ_EMPTY(&asoc->pending_reply_queue)) { 1804 /* first one on */ 1805 TAILQ_INSERT_TAIL(&asoc->pending_reply_queue, control, next); 1806 } else { 1807 struct sctp_queued_to_read *ctlOn, 1808 *nctlOn; 1809 unsigned char inserted = 0; 1810 1811 TAILQ_FOREACH_SAFE(ctlOn, &asoc->pending_reply_queue, next, nctlOn) { 1812 if (SCTP_TSN_GT(control->sinfo_tsn, ctlOn->sinfo_tsn)) { 1813 continue; 1814 } else { 1815 /* found it */ 1816 TAILQ_INSERT_BEFORE(ctlOn, control, next); 1817 inserted = 1; 1818 break; 1819 } 1820 } 1821 if (inserted == 0) { 1822 /* 1823 * must be put at end, use 1824 * prevP (all setup from 1825 * loop) to setup nextP. 1826 */ 1827 TAILQ_INSERT_TAIL(&asoc->pending_reply_queue, control, next); 1828 } 1829 } 1830 } else { 1831 sctp_queue_data_to_stream(stcb, asoc, control, abort_flag); 1832 if (*abort_flag) { 1833 if (last_chunk) { 1834 *m = NULL; 1835 } 1836 return (0); 1837 } 1838 } 1839 } 1840 } else { 1841 /* Into the re-assembly queue */ 1842 sctp_queue_data_for_reasm(stcb, asoc, chk, abort_flag); 1843 if (*abort_flag) { 1844 /* 1845 * the assoc is now gone and chk was put onto the 1846 * reasm queue, which has all been freed. 1847 */ 1848 if (last_chunk) { 1849 *m = NULL; 1850 } 1851 return (0); 1852 } 1853 } 1854 finish_express_del: 1855 if (tsn == (asoc->cumulative_tsn + 1)) { 1856 /* Update cum-ack */ 1857 asoc->cumulative_tsn = tsn; 1858 } 1859 if (last_chunk) { 1860 *m = NULL; 1861 } 1862 if (ordered) { 1863 SCTP_STAT_INCR_COUNTER64(sctps_inorderchunks); 1864 } else { 1865 SCTP_STAT_INCR_COUNTER64(sctps_inunorderchunks); 1866 } 1867 SCTP_STAT_INCR(sctps_recvdata); 1868 /* Set it present please */ 1869 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { 1870 sctp_log_strm_del_alt(stcb, tsn, strmseq, strmno, SCTP_STR_LOG_FROM_MARK_TSN); 1871 } 1872 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 1873 sctp_log_map(asoc->mapping_array_base_tsn, asoc->cumulative_tsn, 1874 asoc->highest_tsn_inside_map, SCTP_MAP_PREPARE_SLIDE); 1875 } 1876 /* check the special flag for stream resets */ 1877 if (((liste = TAILQ_FIRST(&asoc->resetHead)) != NULL) && 1878 SCTP_TSN_GE(asoc->cumulative_tsn, liste->tsn)) { 1879 /* 1880 * we have finished working through the backlogged TSN's now 1881 * time to reset streams. 1: call reset function. 2: free 1882 * pending_reply space 3: distribute any chunks in 1883 * pending_reply_queue. 1884 */ 1885 struct sctp_queued_to_read *ctl, *nctl; 1886 1887 sctp_reset_in_stream(stcb, liste->number_entries, liste->list_of_streams); 1888 TAILQ_REMOVE(&asoc->resetHead, liste, next_resp); 1889 SCTP_FREE(liste, SCTP_M_STRESET); 1890 /* sa_ignore FREED_MEMORY */ 1891 liste = TAILQ_FIRST(&asoc->resetHead); 1892 if (TAILQ_EMPTY(&asoc->resetHead)) { 1893 /* All can be removed */ 1894 TAILQ_FOREACH_SAFE(ctl, &asoc->pending_reply_queue, next, nctl) { 1895 TAILQ_REMOVE(&asoc->pending_reply_queue, ctl, next); 1896 sctp_queue_data_to_stream(stcb, asoc, ctl, abort_flag); 1897 if (*abort_flag) { 1898 return (0); 1899 } 1900 } 1901 } else { 1902 TAILQ_FOREACH_SAFE(ctl, &asoc->pending_reply_queue, next, nctl) { 1903 if (SCTP_TSN_GT(ctl->sinfo_tsn, liste->tsn)) { 1904 break; 1905 } 1906 /* 1907 * if ctl->sinfo_tsn is <= liste->tsn we can 1908 * process it which is the NOT of 1909 * ctl->sinfo_tsn > liste->tsn 1910 */ 1911 TAILQ_REMOVE(&asoc->pending_reply_queue, ctl, next); 1912 sctp_queue_data_to_stream(stcb, asoc, ctl, abort_flag); 1913 if (*abort_flag) { 1914 return (0); 1915 } 1916 } 1917 } 1918 /* 1919 * Now service re-assembly to pick up anything that has been 1920 * held on reassembly queue? 1921 */ 1922 sctp_deliver_reasm_check(stcb, asoc); 1923 need_reasm_check = 0; 1924 } 1925 if (need_reasm_check) { 1926 /* Another one waits ? */ 1927 sctp_deliver_reasm_check(stcb, asoc); 1928 } 1929 return (1); 1930 } 1931 1932 int8_t sctp_map_lookup_tab[256] = { 1933 0, 1, 0, 2, 0, 1, 0, 3, 1934 0, 1, 0, 2, 0, 1, 0, 4, 1935 0, 1, 0, 2, 0, 1, 0, 3, 1936 0, 1, 0, 2, 0, 1, 0, 5, 1937 0, 1, 0, 2, 0, 1, 0, 3, 1938 0, 1, 0, 2, 0, 1, 0, 4, 1939 0, 1, 0, 2, 0, 1, 0, 3, 1940 0, 1, 0, 2, 0, 1, 0, 6, 1941 0, 1, 0, 2, 0, 1, 0, 3, 1942 0, 1, 0, 2, 0, 1, 0, 4, 1943 0, 1, 0, 2, 0, 1, 0, 3, 1944 0, 1, 0, 2, 0, 1, 0, 5, 1945 0, 1, 0, 2, 0, 1, 0, 3, 1946 0, 1, 0, 2, 0, 1, 0, 4, 1947 0, 1, 0, 2, 0, 1, 0, 3, 1948 0, 1, 0, 2, 0, 1, 0, 7, 1949 0, 1, 0, 2, 0, 1, 0, 3, 1950 0, 1, 0, 2, 0, 1, 0, 4, 1951 0, 1, 0, 2, 0, 1, 0, 3, 1952 0, 1, 0, 2, 0, 1, 0, 5, 1953 0, 1, 0, 2, 0, 1, 0, 3, 1954 0, 1, 0, 2, 0, 1, 0, 4, 1955 0, 1, 0, 2, 0, 1, 0, 3, 1956 0, 1, 0, 2, 0, 1, 0, 6, 1957 0, 1, 0, 2, 0, 1, 0, 3, 1958 0, 1, 0, 2, 0, 1, 0, 4, 1959 0, 1, 0, 2, 0, 1, 0, 3, 1960 0, 1, 0, 2, 0, 1, 0, 5, 1961 0, 1, 0, 2, 0, 1, 0, 3, 1962 0, 1, 0, 2, 0, 1, 0, 4, 1963 0, 1, 0, 2, 0, 1, 0, 3, 1964 0, 1, 0, 2, 0, 1, 0, 8 1965 }; 1966 1967 1968 void 1969 sctp_slide_mapping_arrays(struct sctp_tcb *stcb) 1970 { 1971 /* 1972 * Now we also need to check the mapping array in a couple of ways. 1973 * 1) Did we move the cum-ack point? 1974 * 1975 * When you first glance at this you might think that all entries that 1976 * make up the postion of the cum-ack would be in the nr-mapping 1977 * array only.. i.e. things up to the cum-ack are always 1978 * deliverable. Thats true with one exception, when its a fragmented 1979 * message we may not deliver the data until some threshold (or all 1980 * of it) is in place. So we must OR the nr_mapping_array and 1981 * mapping_array to get a true picture of the cum-ack. 1982 */ 1983 struct sctp_association *asoc; 1984 int at; 1985 uint8_t val; 1986 int slide_from, slide_end, lgap, distance; 1987 uint32_t old_cumack, old_base, old_highest, highest_tsn; 1988 1989 asoc = &stcb->asoc; 1990 1991 old_cumack = asoc->cumulative_tsn; 1992 old_base = asoc->mapping_array_base_tsn; 1993 old_highest = asoc->highest_tsn_inside_map; 1994 /* 1995 * We could probably improve this a small bit by calculating the 1996 * offset of the current cum-ack as the starting point. 1997 */ 1998 at = 0; 1999 for (slide_from = 0; slide_from < stcb->asoc.mapping_array_size; slide_from++) { 2000 val = asoc->nr_mapping_array[slide_from] | asoc->mapping_array[slide_from]; 2001 if (val == 0xff) { 2002 at += 8; 2003 } else { 2004 /* there is a 0 bit */ 2005 at += sctp_map_lookup_tab[val]; 2006 break; 2007 } 2008 } 2009 asoc->cumulative_tsn = asoc->mapping_array_base_tsn + (at - 1); 2010 2011 if (SCTP_TSN_GT(asoc->cumulative_tsn, asoc->highest_tsn_inside_map) && 2012 SCTP_TSN_GT(asoc->cumulative_tsn, asoc->highest_tsn_inside_nr_map)) { 2013 #ifdef INVARIANTS 2014 panic("huh, cumack 0x%x greater than high-tsn 0x%x in map", 2015 asoc->cumulative_tsn, asoc->highest_tsn_inside_map); 2016 #else 2017 SCTP_PRINTF("huh, cumack 0x%x greater than high-tsn 0x%x in map - should panic?\n", 2018 asoc->cumulative_tsn, asoc->highest_tsn_inside_map); 2019 sctp_print_mapping_array(asoc); 2020 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 2021 sctp_log_map(0, 6, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 2022 } 2023 asoc->highest_tsn_inside_map = asoc->cumulative_tsn; 2024 asoc->highest_tsn_inside_nr_map = asoc->cumulative_tsn; 2025 #endif 2026 } 2027 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->highest_tsn_inside_map)) { 2028 highest_tsn = asoc->highest_tsn_inside_nr_map; 2029 } else { 2030 highest_tsn = asoc->highest_tsn_inside_map; 2031 } 2032 if ((asoc->cumulative_tsn == highest_tsn) && (at >= 8)) { 2033 /* The complete array was completed by a single FR */ 2034 /* highest becomes the cum-ack */ 2035 int clr; 2036 2037 #ifdef INVARIANTS 2038 unsigned int i; 2039 2040 #endif 2041 2042 /* clear the array */ 2043 clr = ((at + 7) >> 3); 2044 if (clr > asoc->mapping_array_size) { 2045 clr = asoc->mapping_array_size; 2046 } 2047 memset(asoc->mapping_array, 0, clr); 2048 memset(asoc->nr_mapping_array, 0, clr); 2049 #ifdef INVARIANTS 2050 for (i = 0; i < asoc->mapping_array_size; i++) { 2051 if ((asoc->mapping_array[i]) || (asoc->nr_mapping_array[i])) { 2052 SCTP_PRINTF("Error Mapping array's not clean at clear\n"); 2053 sctp_print_mapping_array(asoc); 2054 } 2055 } 2056 #endif 2057 asoc->mapping_array_base_tsn = asoc->cumulative_tsn + 1; 2058 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map = asoc->cumulative_tsn; 2059 } else if (at >= 8) { 2060 /* we can slide the mapping array down */ 2061 /* slide_from holds where we hit the first NON 0xff byte */ 2062 2063 /* 2064 * now calculate the ceiling of the move using our highest 2065 * TSN value 2066 */ 2067 SCTP_CALC_TSN_TO_GAP(lgap, highest_tsn, asoc->mapping_array_base_tsn); 2068 slide_end = (lgap >> 3); 2069 if (slide_end < slide_from) { 2070 sctp_print_mapping_array(asoc); 2071 #ifdef INVARIANTS 2072 panic("impossible slide"); 2073 #else 2074 SCTP_PRINTF("impossible slide lgap:%x slide_end:%x slide_from:%x? at:%d\n", 2075 lgap, slide_end, slide_from, at); 2076 return; 2077 #endif 2078 } 2079 if (slide_end > asoc->mapping_array_size) { 2080 #ifdef INVARIANTS 2081 panic("would overrun buffer"); 2082 #else 2083 SCTP_PRINTF("Gak, would have overrun map end:%d slide_end:%d\n", 2084 asoc->mapping_array_size, slide_end); 2085 slide_end = asoc->mapping_array_size; 2086 #endif 2087 } 2088 distance = (slide_end - slide_from) + 1; 2089 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 2090 sctp_log_map(old_base, old_cumack, old_highest, 2091 SCTP_MAP_PREPARE_SLIDE); 2092 sctp_log_map((uint32_t) slide_from, (uint32_t) slide_end, 2093 (uint32_t) lgap, SCTP_MAP_SLIDE_FROM); 2094 } 2095 if (distance + slide_from > asoc->mapping_array_size || 2096 distance < 0) { 2097 /* 2098 * Here we do NOT slide forward the array so that 2099 * hopefully when more data comes in to fill it up 2100 * we will be able to slide it forward. Really I 2101 * don't think this should happen :-0 2102 */ 2103 2104 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 2105 sctp_log_map((uint32_t) distance, (uint32_t) slide_from, 2106 (uint32_t) asoc->mapping_array_size, 2107 SCTP_MAP_SLIDE_NONE); 2108 } 2109 } else { 2110 int ii; 2111 2112 for (ii = 0; ii < distance; ii++) { 2113 asoc->mapping_array[ii] = asoc->mapping_array[slide_from + ii]; 2114 asoc->nr_mapping_array[ii] = asoc->nr_mapping_array[slide_from + ii]; 2115 2116 } 2117 for (ii = distance; ii < asoc->mapping_array_size; ii++) { 2118 asoc->mapping_array[ii] = 0; 2119 asoc->nr_mapping_array[ii] = 0; 2120 } 2121 if (asoc->highest_tsn_inside_map + 1 == asoc->mapping_array_base_tsn) { 2122 asoc->highest_tsn_inside_map += (slide_from << 3); 2123 } 2124 if (asoc->highest_tsn_inside_nr_map + 1 == asoc->mapping_array_base_tsn) { 2125 asoc->highest_tsn_inside_nr_map += (slide_from << 3); 2126 } 2127 asoc->mapping_array_base_tsn += (slide_from << 3); 2128 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 2129 sctp_log_map(asoc->mapping_array_base_tsn, 2130 asoc->cumulative_tsn, asoc->highest_tsn_inside_map, 2131 SCTP_MAP_SLIDE_RESULT); 2132 } 2133 } 2134 } 2135 } 2136 2137 void 2138 sctp_sack_check(struct sctp_tcb *stcb, int was_a_gap) 2139 { 2140 struct sctp_association *asoc; 2141 uint32_t highest_tsn; 2142 2143 asoc = &stcb->asoc; 2144 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->highest_tsn_inside_map)) { 2145 highest_tsn = asoc->highest_tsn_inside_nr_map; 2146 } else { 2147 highest_tsn = asoc->highest_tsn_inside_map; 2148 } 2149 2150 /* 2151 * Now we need to see if we need to queue a sack or just start the 2152 * timer (if allowed). 2153 */ 2154 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 2155 /* 2156 * Ok special case, in SHUTDOWN-SENT case. here we maker 2157 * sure SACK timer is off and instead send a SHUTDOWN and a 2158 * SACK 2159 */ 2160 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) { 2161 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, 2162 stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_INDATA + SCTP_LOC_18); 2163 } 2164 sctp_send_shutdown(stcb, 2165 ((stcb->asoc.alternate) ? stcb->asoc.alternate : stcb->asoc.primary_destination)); 2166 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 2167 } else { 2168 int is_a_gap; 2169 2170 /* is there a gap now ? */ 2171 is_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 2172 2173 /* 2174 * CMT DAC algorithm: increase number of packets received 2175 * since last ack 2176 */ 2177 stcb->asoc.cmt_dac_pkts_rcvd++; 2178 2179 if ((stcb->asoc.send_sack == 1) || /* We need to send a 2180 * SACK */ 2181 ((was_a_gap) && (is_a_gap == 0)) || /* was a gap, but no 2182 * longer is one */ 2183 (stcb->asoc.numduptsns) || /* we have dup's */ 2184 (is_a_gap) || /* is still a gap */ 2185 (stcb->asoc.delayed_ack == 0) || /* Delayed sack disabled */ 2186 (stcb->asoc.data_pkts_seen >= stcb->asoc.sack_freq) /* hit limit of pkts */ 2187 ) { 2188 2189 if ((stcb->asoc.sctp_cmt_on_off > 0) && 2190 (SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) && 2191 (stcb->asoc.send_sack == 0) && 2192 (stcb->asoc.numduptsns == 0) && 2193 (stcb->asoc.delayed_ack) && 2194 (!SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer))) { 2195 2196 /* 2197 * CMT DAC algorithm: With CMT, delay acks 2198 * even in the face of 2199 * 2200 * reordering. Therefore, if acks that do not 2201 * have to be sent because of the above 2202 * reasons, will be delayed. That is, acks 2203 * that would have been sent due to gap 2204 * reports will be delayed with DAC. Start 2205 * the delayed ack timer. 2206 */ 2207 sctp_timer_start(SCTP_TIMER_TYPE_RECV, 2208 stcb->sctp_ep, stcb, NULL); 2209 } else { 2210 /* 2211 * Ok we must build a SACK since the timer 2212 * is pending, we got our first packet OR 2213 * there are gaps or duplicates. 2214 */ 2215 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer); 2216 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 2217 } 2218 } else { 2219 if (!SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) { 2220 sctp_timer_start(SCTP_TIMER_TYPE_RECV, 2221 stcb->sctp_ep, stcb, NULL); 2222 } 2223 } 2224 } 2225 } 2226 2227 void 2228 sctp_service_queues(struct sctp_tcb *stcb, struct sctp_association *asoc) 2229 { 2230 struct sctp_tmit_chunk *chk; 2231 uint32_t tsize, pd_point; 2232 uint16_t nxt_todel; 2233 2234 if (asoc->fragmented_delivery_inprogress) { 2235 sctp_service_reassembly(stcb, asoc); 2236 } 2237 /* Can we proceed further, i.e. the PD-API is complete */ 2238 if (asoc->fragmented_delivery_inprogress) { 2239 /* no */ 2240 return; 2241 } 2242 /* 2243 * Now is there some other chunk I can deliver from the reassembly 2244 * queue. 2245 */ 2246 doit_again: 2247 chk = TAILQ_FIRST(&asoc->reasmqueue); 2248 if (chk == NULL) { 2249 asoc->size_on_reasm_queue = 0; 2250 asoc->cnt_on_reasm_queue = 0; 2251 return; 2252 } 2253 nxt_todel = asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered + 1; 2254 if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) && 2255 ((nxt_todel == chk->rec.data.stream_seq) || 2256 (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED))) { 2257 /* 2258 * Yep the first one is here. We setup to start reception, 2259 * by backing down the TSN just in case we can't deliver. 2260 */ 2261 2262 /* 2263 * Before we start though either all of the message should 2264 * be here or the socket buffer max or nothing on the 2265 * delivery queue and something can be delivered. 2266 */ 2267 if (stcb->sctp_socket) { 2268 pd_point = min(SCTP_SB_LIMIT_RCV(stcb->sctp_socket) >> SCTP_PARTIAL_DELIVERY_SHIFT, 2269 stcb->sctp_ep->partial_delivery_point); 2270 } else { 2271 pd_point = stcb->sctp_ep->partial_delivery_point; 2272 } 2273 if (sctp_is_all_msg_on_reasm(asoc, &tsize) || (tsize >= pd_point)) { 2274 asoc->fragmented_delivery_inprogress = 1; 2275 asoc->tsn_last_delivered = chk->rec.data.TSN_seq - 1; 2276 asoc->str_of_pdapi = chk->rec.data.stream_number; 2277 asoc->ssn_of_pdapi = chk->rec.data.stream_seq; 2278 asoc->pdapi_ppid = chk->rec.data.payloadtype; 2279 asoc->fragment_flags = chk->rec.data.rcv_flags; 2280 sctp_service_reassembly(stcb, asoc); 2281 if (asoc->fragmented_delivery_inprogress == 0) { 2282 goto doit_again; 2283 } 2284 } 2285 } 2286 } 2287 2288 int 2289 sctp_process_data(struct mbuf **mm, int iphlen, int *offset, int length, 2290 struct sockaddr *src, struct sockaddr *dst, 2291 struct sctphdr *sh, struct sctp_inpcb *inp, 2292 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t * high_tsn, 2293 uint8_t mflowtype, uint32_t mflowid, 2294 uint32_t vrf_id, uint16_t port) 2295 { 2296 struct sctp_data_chunk *ch, chunk_buf; 2297 struct sctp_association *asoc; 2298 int num_chunks = 0; /* number of control chunks processed */ 2299 int stop_proc = 0; 2300 int chk_length, break_flag, last_chunk; 2301 int abort_flag = 0, was_a_gap; 2302 struct mbuf *m; 2303 uint32_t highest_tsn; 2304 2305 /* set the rwnd */ 2306 sctp_set_rwnd(stcb, &stcb->asoc); 2307 2308 m = *mm; 2309 SCTP_TCB_LOCK_ASSERT(stcb); 2310 asoc = &stcb->asoc; 2311 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->highest_tsn_inside_map)) { 2312 highest_tsn = asoc->highest_tsn_inside_nr_map; 2313 } else { 2314 highest_tsn = asoc->highest_tsn_inside_map; 2315 } 2316 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 2317 /* 2318 * setup where we got the last DATA packet from for any SACK that 2319 * may need to go out. Don't bump the net. This is done ONLY when a 2320 * chunk is assigned. 2321 */ 2322 asoc->last_data_chunk_from = net; 2323 2324 /*- 2325 * Now before we proceed we must figure out if this is a wasted 2326 * cluster... i.e. it is a small packet sent in and yet the driver 2327 * underneath allocated a full cluster for it. If so we must copy it 2328 * to a smaller mbuf and free up the cluster mbuf. This will help 2329 * with cluster starvation. Note for __Panda__ we don't do this 2330 * since it has clusters all the way down to 64 bytes. 2331 */ 2332 if (SCTP_BUF_LEN(m) < (long)MLEN && SCTP_BUF_NEXT(m) == NULL) { 2333 /* we only handle mbufs that are singletons.. not chains */ 2334 m = sctp_get_mbuf_for_msg(SCTP_BUF_LEN(m), 0, M_NOWAIT, 1, MT_DATA); 2335 if (m) { 2336 /* ok lets see if we can copy the data up */ 2337 caddr_t *from, *to; 2338 2339 /* get the pointers and copy */ 2340 to = mtod(m, caddr_t *); 2341 from = mtod((*mm), caddr_t *); 2342 memcpy(to, from, SCTP_BUF_LEN((*mm))); 2343 /* copy the length and free up the old */ 2344 SCTP_BUF_LEN(m) = SCTP_BUF_LEN((*mm)); 2345 sctp_m_freem(*mm); 2346 /* sucess, back copy */ 2347 *mm = m; 2348 } else { 2349 /* We are in trouble in the mbuf world .. yikes */ 2350 m = *mm; 2351 } 2352 } 2353 /* get pointer to the first chunk header */ 2354 ch = (struct sctp_data_chunk *)sctp_m_getptr(m, *offset, 2355 sizeof(struct sctp_data_chunk), (uint8_t *) & chunk_buf); 2356 if (ch == NULL) { 2357 return (1); 2358 } 2359 /* 2360 * process all DATA chunks... 2361 */ 2362 *high_tsn = asoc->cumulative_tsn; 2363 break_flag = 0; 2364 asoc->data_pkts_seen++; 2365 while (stop_proc == 0) { 2366 /* validate chunk length */ 2367 chk_length = ntohs(ch->ch.chunk_length); 2368 if (length - *offset < chk_length) { 2369 /* all done, mutulated chunk */ 2370 stop_proc = 1; 2371 continue; 2372 } 2373 if (ch->ch.chunk_type == SCTP_DATA) { 2374 if ((size_t)chk_length < sizeof(struct sctp_data_chunk)) { 2375 /* 2376 * Need to send an abort since we had a 2377 * invalid data chunk. 2378 */ 2379 struct mbuf *op_err; 2380 char msg[SCTP_DIAG_INFO_LEN]; 2381 2382 snprintf(msg, sizeof(msg), "DATA chunk of length %d", 2383 chk_length); 2384 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 2385 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_19; 2386 sctp_abort_association(inp, stcb, m, iphlen, 2387 src, dst, sh, op_err, 2388 mflowtype, mflowid, 2389 vrf_id, port); 2390 return (2); 2391 } 2392 if ((size_t)chk_length == sizeof(struct sctp_data_chunk)) { 2393 /* 2394 * Need to send an abort since we had an 2395 * empty data chunk. 2396 */ 2397 struct mbuf *op_err; 2398 2399 op_err = sctp_generate_no_user_data_cause(ch->dp.tsn); 2400 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_19; 2401 sctp_abort_association(inp, stcb, m, iphlen, 2402 src, dst, sh, op_err, 2403 mflowtype, mflowid, 2404 vrf_id, port); 2405 return (2); 2406 } 2407 #ifdef SCTP_AUDITING_ENABLED 2408 sctp_audit_log(0xB1, 0); 2409 #endif 2410 if (SCTP_SIZE32(chk_length) == (length - *offset)) { 2411 last_chunk = 1; 2412 } else { 2413 last_chunk = 0; 2414 } 2415 if (sctp_process_a_data_chunk(stcb, asoc, mm, *offset, ch, 2416 chk_length, net, high_tsn, &abort_flag, &break_flag, 2417 last_chunk)) { 2418 num_chunks++; 2419 } 2420 if (abort_flag) 2421 return (2); 2422 2423 if (break_flag) { 2424 /* 2425 * Set because of out of rwnd space and no 2426 * drop rep space left. 2427 */ 2428 stop_proc = 1; 2429 continue; 2430 } 2431 } else { 2432 /* not a data chunk in the data region */ 2433 switch (ch->ch.chunk_type) { 2434 case SCTP_INITIATION: 2435 case SCTP_INITIATION_ACK: 2436 case SCTP_SELECTIVE_ACK: 2437 case SCTP_NR_SELECTIVE_ACK: 2438 case SCTP_HEARTBEAT_REQUEST: 2439 case SCTP_HEARTBEAT_ACK: 2440 case SCTP_ABORT_ASSOCIATION: 2441 case SCTP_SHUTDOWN: 2442 case SCTP_SHUTDOWN_ACK: 2443 case SCTP_OPERATION_ERROR: 2444 case SCTP_COOKIE_ECHO: 2445 case SCTP_COOKIE_ACK: 2446 case SCTP_ECN_ECHO: 2447 case SCTP_ECN_CWR: 2448 case SCTP_SHUTDOWN_COMPLETE: 2449 case SCTP_AUTHENTICATION: 2450 case SCTP_ASCONF_ACK: 2451 case SCTP_PACKET_DROPPED: 2452 case SCTP_STREAM_RESET: 2453 case SCTP_FORWARD_CUM_TSN: 2454 case SCTP_ASCONF: 2455 /* 2456 * Now, what do we do with KNOWN chunks that 2457 * are NOT in the right place? 2458 * 2459 * For now, I do nothing but ignore them. We 2460 * may later want to add sysctl stuff to 2461 * switch out and do either an ABORT() or 2462 * possibly process them. 2463 */ 2464 if (SCTP_BASE_SYSCTL(sctp_strict_data_order)) { 2465 struct mbuf *op_err; 2466 2467 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, ""); 2468 sctp_abort_association(inp, stcb, 2469 m, iphlen, 2470 src, dst, 2471 sh, op_err, 2472 mflowtype, mflowid, 2473 vrf_id, port); 2474 return (2); 2475 } 2476 break; 2477 default: 2478 /* unknown chunk type, use bit rules */ 2479 if (ch->ch.chunk_type & 0x40) { 2480 /* Add a error report to the queue */ 2481 struct mbuf *merr; 2482 struct sctp_paramhdr *phd; 2483 2484 merr = sctp_get_mbuf_for_msg(sizeof(*phd), 0, M_NOWAIT, 1, MT_DATA); 2485 if (merr) { 2486 phd = mtod(merr, struct sctp_paramhdr *); 2487 /* 2488 * We cheat and use param 2489 * type since we did not 2490 * bother to define a error 2491 * cause struct. They are 2492 * the same basic format 2493 * with different names. 2494 */ 2495 phd->param_type = 2496 htons(SCTP_CAUSE_UNRECOG_CHUNK); 2497 phd->param_length = 2498 htons(chk_length + sizeof(*phd)); 2499 SCTP_BUF_LEN(merr) = sizeof(*phd); 2500 SCTP_BUF_NEXT(merr) = SCTP_M_COPYM(m, *offset, chk_length, M_NOWAIT); 2501 if (SCTP_BUF_NEXT(merr)) { 2502 if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(merr), SCTP_SIZE32(chk_length) - chk_length, NULL) == NULL) { 2503 sctp_m_freem(merr); 2504 } else { 2505 sctp_queue_op_err(stcb, merr); 2506 } 2507 } else { 2508 sctp_m_freem(merr); 2509 } 2510 } 2511 } 2512 if ((ch->ch.chunk_type & 0x80) == 0) { 2513 /* discard the rest of this packet */ 2514 stop_proc = 1; 2515 } /* else skip this bad chunk and 2516 * continue... */ 2517 break; 2518 } /* switch of chunk type */ 2519 } 2520 *offset += SCTP_SIZE32(chk_length); 2521 if ((*offset >= length) || stop_proc) { 2522 /* no more data left in the mbuf chain */ 2523 stop_proc = 1; 2524 continue; 2525 } 2526 ch = (struct sctp_data_chunk *)sctp_m_getptr(m, *offset, 2527 sizeof(struct sctp_data_chunk), (uint8_t *) & chunk_buf); 2528 if (ch == NULL) { 2529 *offset = length; 2530 stop_proc = 1; 2531 continue; 2532 } 2533 } 2534 if (break_flag) { 2535 /* 2536 * we need to report rwnd overrun drops. 2537 */ 2538 sctp_send_packet_dropped(stcb, net, *mm, length, iphlen, 0); 2539 } 2540 if (num_chunks) { 2541 /* 2542 * Did we get data, if so update the time for auto-close and 2543 * give peer credit for being alive. 2544 */ 2545 SCTP_STAT_INCR(sctps_recvpktwithdata); 2546 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 2547 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 2548 stcb->asoc.overall_error_count, 2549 0, 2550 SCTP_FROM_SCTP_INDATA, 2551 __LINE__); 2552 } 2553 stcb->asoc.overall_error_count = 0; 2554 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_last_rcvd); 2555 } 2556 /* now service all of the reassm queue if needed */ 2557 if (!(TAILQ_EMPTY(&asoc->reasmqueue))) 2558 sctp_service_queues(stcb, asoc); 2559 2560 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 2561 /* Assure that we ack right away */ 2562 stcb->asoc.send_sack = 1; 2563 } 2564 /* Start a sack timer or QUEUE a SACK for sending */ 2565 sctp_sack_check(stcb, was_a_gap); 2566 return (0); 2567 } 2568 2569 static int 2570 sctp_process_segment_range(struct sctp_tcb *stcb, struct sctp_tmit_chunk **p_tp1, uint32_t last_tsn, 2571 uint16_t frag_strt, uint16_t frag_end, int nr_sacking, 2572 int *num_frs, 2573 uint32_t * biggest_newly_acked_tsn, 2574 uint32_t * this_sack_lowest_newack, 2575 int *rto_ok) 2576 { 2577 struct sctp_tmit_chunk *tp1; 2578 unsigned int theTSN; 2579 int j, wake_him = 0, circled = 0; 2580 2581 /* Recover the tp1 we last saw */ 2582 tp1 = *p_tp1; 2583 if (tp1 == NULL) { 2584 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue); 2585 } 2586 for (j = frag_strt; j <= frag_end; j++) { 2587 theTSN = j + last_tsn; 2588 while (tp1) { 2589 if (tp1->rec.data.doing_fast_retransmit) 2590 (*num_frs) += 1; 2591 2592 /*- 2593 * CMT: CUCv2 algorithm. For each TSN being 2594 * processed from the sent queue, track the 2595 * next expected pseudo-cumack, or 2596 * rtx_pseudo_cumack, if required. Separate 2597 * cumack trackers for first transmissions, 2598 * and retransmissions. 2599 */ 2600 if ((tp1->sent < SCTP_DATAGRAM_RESEND) && 2601 (tp1->whoTo->find_pseudo_cumack == 1) && 2602 (tp1->snd_count == 1)) { 2603 tp1->whoTo->pseudo_cumack = tp1->rec.data.TSN_seq; 2604 tp1->whoTo->find_pseudo_cumack = 0; 2605 } 2606 if ((tp1->sent < SCTP_DATAGRAM_RESEND) && 2607 (tp1->whoTo->find_rtx_pseudo_cumack == 1) && 2608 (tp1->snd_count > 1)) { 2609 tp1->whoTo->rtx_pseudo_cumack = tp1->rec.data.TSN_seq; 2610 tp1->whoTo->find_rtx_pseudo_cumack = 0; 2611 } 2612 if (tp1->rec.data.TSN_seq == theTSN) { 2613 if (tp1->sent != SCTP_DATAGRAM_UNSENT) { 2614 /*- 2615 * must be held until 2616 * cum-ack passes 2617 */ 2618 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 2619 /*- 2620 * If it is less than RESEND, it is 2621 * now no-longer in flight. 2622 * Higher values may already be set 2623 * via previous Gap Ack Blocks... 2624 * i.e. ACKED or RESEND. 2625 */ 2626 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, 2627 *biggest_newly_acked_tsn)) { 2628 *biggest_newly_acked_tsn = tp1->rec.data.TSN_seq; 2629 } 2630 /*- 2631 * CMT: SFR algo (and HTNA) - set 2632 * saw_newack to 1 for dest being 2633 * newly acked. update 2634 * this_sack_highest_newack if 2635 * appropriate. 2636 */ 2637 if (tp1->rec.data.chunk_was_revoked == 0) 2638 tp1->whoTo->saw_newack = 1; 2639 2640 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, 2641 tp1->whoTo->this_sack_highest_newack)) { 2642 tp1->whoTo->this_sack_highest_newack = 2643 tp1->rec.data.TSN_seq; 2644 } 2645 /*- 2646 * CMT DAC algo: also update 2647 * this_sack_lowest_newack 2648 */ 2649 if (*this_sack_lowest_newack == 0) { 2650 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 2651 sctp_log_sack(*this_sack_lowest_newack, 2652 last_tsn, 2653 tp1->rec.data.TSN_seq, 2654 0, 2655 0, 2656 SCTP_LOG_TSN_ACKED); 2657 } 2658 *this_sack_lowest_newack = tp1->rec.data.TSN_seq; 2659 } 2660 /*- 2661 * CMT: CUCv2 algorithm. If (rtx-)pseudo-cumack for corresp 2662 * dest is being acked, then we have a new (rtx-)pseudo-cumack. Set 2663 * new_(rtx_)pseudo_cumack to TRUE so that the cwnd for this dest can be 2664 * updated. Also trigger search for the next expected (rtx-)pseudo-cumack. 2665 * Separate pseudo_cumack trackers for first transmissions and 2666 * retransmissions. 2667 */ 2668 if (tp1->rec.data.TSN_seq == tp1->whoTo->pseudo_cumack) { 2669 if (tp1->rec.data.chunk_was_revoked == 0) { 2670 tp1->whoTo->new_pseudo_cumack = 1; 2671 } 2672 tp1->whoTo->find_pseudo_cumack = 1; 2673 } 2674 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 2675 sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK); 2676 } 2677 if (tp1->rec.data.TSN_seq == tp1->whoTo->rtx_pseudo_cumack) { 2678 if (tp1->rec.data.chunk_was_revoked == 0) { 2679 tp1->whoTo->new_pseudo_cumack = 1; 2680 } 2681 tp1->whoTo->find_rtx_pseudo_cumack = 1; 2682 } 2683 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 2684 sctp_log_sack(*biggest_newly_acked_tsn, 2685 last_tsn, 2686 tp1->rec.data.TSN_seq, 2687 frag_strt, 2688 frag_end, 2689 SCTP_LOG_TSN_ACKED); 2690 } 2691 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 2692 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_GAP, 2693 tp1->whoTo->flight_size, 2694 tp1->book_size, 2695 (uintptr_t) tp1->whoTo, 2696 tp1->rec.data.TSN_seq); 2697 } 2698 sctp_flight_size_decrease(tp1); 2699 if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) { 2700 (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo, 2701 tp1); 2702 } 2703 sctp_total_flight_decrease(stcb, tp1); 2704 2705 tp1->whoTo->net_ack += tp1->send_size; 2706 if (tp1->snd_count < 2) { 2707 /*- 2708 * True non-retransmited chunk 2709 */ 2710 tp1->whoTo->net_ack2 += tp1->send_size; 2711 2712 /*- 2713 * update RTO too ? 2714 */ 2715 if (tp1->do_rtt) { 2716 if (*rto_ok) { 2717 tp1->whoTo->RTO = 2718 sctp_calculate_rto(stcb, 2719 &stcb->asoc, 2720 tp1->whoTo, 2721 &tp1->sent_rcv_time, 2722 sctp_align_safe_nocopy, 2723 SCTP_RTT_FROM_DATA); 2724 *rto_ok = 0; 2725 } 2726 if (tp1->whoTo->rto_needed == 0) { 2727 tp1->whoTo->rto_needed = 1; 2728 } 2729 tp1->do_rtt = 0; 2730 } 2731 } 2732 } 2733 if (tp1->sent <= SCTP_DATAGRAM_RESEND) { 2734 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, 2735 stcb->asoc.this_sack_highest_gap)) { 2736 stcb->asoc.this_sack_highest_gap = 2737 tp1->rec.data.TSN_seq; 2738 } 2739 if (tp1->sent == SCTP_DATAGRAM_RESEND) { 2740 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt); 2741 #ifdef SCTP_AUDITING_ENABLED 2742 sctp_audit_log(0xB2, 2743 (stcb->asoc.sent_queue_retran_cnt & 0x000000ff)); 2744 #endif 2745 } 2746 } 2747 /*- 2748 * All chunks NOT UNSENT fall through here and are marked 2749 * (leave PR-SCTP ones that are to skip alone though) 2750 */ 2751 if ((tp1->sent != SCTP_FORWARD_TSN_SKIP) && 2752 (tp1->sent != SCTP_DATAGRAM_NR_ACKED)) { 2753 tp1->sent = SCTP_DATAGRAM_MARKED; 2754 } 2755 if (tp1->rec.data.chunk_was_revoked) { 2756 /* deflate the cwnd */ 2757 tp1->whoTo->cwnd -= tp1->book_size; 2758 tp1->rec.data.chunk_was_revoked = 0; 2759 } 2760 /* NR Sack code here */ 2761 if (nr_sacking && 2762 (tp1->sent != SCTP_DATAGRAM_NR_ACKED)) { 2763 if (stcb->asoc.strmout[tp1->rec.data.stream_number].chunks_on_queues > 0) { 2764 stcb->asoc.strmout[tp1->rec.data.stream_number].chunks_on_queues--; 2765 #ifdef INVARIANTS 2766 } else { 2767 panic("No chunks on the queues for sid %u.", tp1->rec.data.stream_number); 2768 #endif 2769 } 2770 tp1->sent = SCTP_DATAGRAM_NR_ACKED; 2771 if (tp1->data) { 2772 /* 2773 * sa_ignore 2774 * NO_NULL_CHK 2775 */ 2776 sctp_free_bufspace(stcb, &stcb->asoc, tp1, 1); 2777 sctp_m_freem(tp1->data); 2778 tp1->data = NULL; 2779 } 2780 wake_him++; 2781 } 2782 } 2783 break; 2784 } /* if (tp1->TSN_seq == theTSN) */ 2785 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, theTSN)) { 2786 break; 2787 } 2788 tp1 = TAILQ_NEXT(tp1, sctp_next); 2789 if ((tp1 == NULL) && (circled == 0)) { 2790 circled++; 2791 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue); 2792 } 2793 } /* end while (tp1) */ 2794 if (tp1 == NULL) { 2795 circled = 0; 2796 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue); 2797 } 2798 /* In case the fragments were not in order we must reset */ 2799 } /* end for (j = fragStart */ 2800 *p_tp1 = tp1; 2801 return (wake_him); /* Return value only used for nr-sack */ 2802 } 2803 2804 2805 static int 2806 sctp_handle_segments(struct mbuf *m, int *offset, struct sctp_tcb *stcb, struct sctp_association *asoc, 2807 uint32_t last_tsn, uint32_t * biggest_tsn_acked, 2808 uint32_t * biggest_newly_acked_tsn, uint32_t * this_sack_lowest_newack, 2809 int num_seg, int num_nr_seg, int *rto_ok) 2810 { 2811 struct sctp_gap_ack_block *frag, block; 2812 struct sctp_tmit_chunk *tp1; 2813 int i; 2814 int num_frs = 0; 2815 int chunk_freed; 2816 int non_revocable; 2817 uint16_t frag_strt, frag_end, prev_frag_end; 2818 2819 tp1 = TAILQ_FIRST(&asoc->sent_queue); 2820 prev_frag_end = 0; 2821 chunk_freed = 0; 2822 2823 for (i = 0; i < (num_seg + num_nr_seg); i++) { 2824 if (i == num_seg) { 2825 prev_frag_end = 0; 2826 tp1 = TAILQ_FIRST(&asoc->sent_queue); 2827 } 2828 frag = (struct sctp_gap_ack_block *)sctp_m_getptr(m, *offset, 2829 sizeof(struct sctp_gap_ack_block), (uint8_t *) & block); 2830 *offset += sizeof(block); 2831 if (frag == NULL) { 2832 return (chunk_freed); 2833 } 2834 frag_strt = ntohs(frag->start); 2835 frag_end = ntohs(frag->end); 2836 2837 if (frag_strt > frag_end) { 2838 /* This gap report is malformed, skip it. */ 2839 continue; 2840 } 2841 if (frag_strt <= prev_frag_end) { 2842 /* This gap report is not in order, so restart. */ 2843 tp1 = TAILQ_FIRST(&asoc->sent_queue); 2844 } 2845 if (SCTP_TSN_GT((last_tsn + frag_end), *biggest_tsn_acked)) { 2846 *biggest_tsn_acked = last_tsn + frag_end; 2847 } 2848 if (i < num_seg) { 2849 non_revocable = 0; 2850 } else { 2851 non_revocable = 1; 2852 } 2853 if (sctp_process_segment_range(stcb, &tp1, last_tsn, frag_strt, frag_end, 2854 non_revocable, &num_frs, biggest_newly_acked_tsn, 2855 this_sack_lowest_newack, rto_ok)) { 2856 chunk_freed = 1; 2857 } 2858 prev_frag_end = frag_end; 2859 } 2860 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 2861 if (num_frs) 2862 sctp_log_fr(*biggest_tsn_acked, 2863 *biggest_newly_acked_tsn, 2864 last_tsn, SCTP_FR_LOG_BIGGEST_TSNS); 2865 } 2866 return (chunk_freed); 2867 } 2868 2869 static void 2870 sctp_check_for_revoked(struct sctp_tcb *stcb, 2871 struct sctp_association *asoc, uint32_t cumack, 2872 uint32_t biggest_tsn_acked) 2873 { 2874 struct sctp_tmit_chunk *tp1; 2875 2876 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 2877 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, cumack)) { 2878 /* 2879 * ok this guy is either ACK or MARKED. If it is 2880 * ACKED it has been previously acked but not this 2881 * time i.e. revoked. If it is MARKED it was ACK'ed 2882 * again. 2883 */ 2884 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, biggest_tsn_acked)) { 2885 break; 2886 } 2887 if (tp1->sent == SCTP_DATAGRAM_ACKED) { 2888 /* it has been revoked */ 2889 tp1->sent = SCTP_DATAGRAM_SENT; 2890 tp1->rec.data.chunk_was_revoked = 1; 2891 /* 2892 * We must add this stuff back in to assure 2893 * timers and such get started. 2894 */ 2895 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 2896 sctp_misc_ints(SCTP_FLIGHT_LOG_UP_REVOKE, 2897 tp1->whoTo->flight_size, 2898 tp1->book_size, 2899 (uintptr_t) tp1->whoTo, 2900 tp1->rec.data.TSN_seq); 2901 } 2902 sctp_flight_size_increase(tp1); 2903 sctp_total_flight_increase(stcb, tp1); 2904 /* 2905 * We inflate the cwnd to compensate for our 2906 * artificial inflation of the flight_size. 2907 */ 2908 tp1->whoTo->cwnd += tp1->book_size; 2909 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 2910 sctp_log_sack(asoc->last_acked_seq, 2911 cumack, 2912 tp1->rec.data.TSN_seq, 2913 0, 2914 0, 2915 SCTP_LOG_TSN_REVOKED); 2916 } 2917 } else if (tp1->sent == SCTP_DATAGRAM_MARKED) { 2918 /* it has been re-acked in this SACK */ 2919 tp1->sent = SCTP_DATAGRAM_ACKED; 2920 } 2921 } 2922 if (tp1->sent == SCTP_DATAGRAM_UNSENT) 2923 break; 2924 } 2925 } 2926 2927 2928 static void 2929 sctp_strike_gap_ack_chunks(struct sctp_tcb *stcb, struct sctp_association *asoc, 2930 uint32_t biggest_tsn_acked, uint32_t biggest_tsn_newly_acked, uint32_t this_sack_lowest_newack, int accum_moved) 2931 { 2932 struct sctp_tmit_chunk *tp1; 2933 int strike_flag = 0; 2934 struct timeval now; 2935 int tot_retrans = 0; 2936 uint32_t sending_seq; 2937 struct sctp_nets *net; 2938 int num_dests_sacked = 0; 2939 2940 /* 2941 * select the sending_seq, this is either the next thing ready to be 2942 * sent but not transmitted, OR, the next seq we assign. 2943 */ 2944 tp1 = TAILQ_FIRST(&stcb->asoc.send_queue); 2945 if (tp1 == NULL) { 2946 sending_seq = asoc->sending_seq; 2947 } else { 2948 sending_seq = tp1->rec.data.TSN_seq; 2949 } 2950 2951 /* CMT DAC algo: finding out if SACK is a mixed SACK */ 2952 if ((asoc->sctp_cmt_on_off > 0) && 2953 SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) { 2954 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 2955 if (net->saw_newack) 2956 num_dests_sacked++; 2957 } 2958 } 2959 if (stcb->asoc.prsctp_supported) { 2960 (void)SCTP_GETTIME_TIMEVAL(&now); 2961 } 2962 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 2963 strike_flag = 0; 2964 if (tp1->no_fr_allowed) { 2965 /* this one had a timeout or something */ 2966 continue; 2967 } 2968 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 2969 if (tp1->sent < SCTP_DATAGRAM_RESEND) 2970 sctp_log_fr(biggest_tsn_newly_acked, 2971 tp1->rec.data.TSN_seq, 2972 tp1->sent, 2973 SCTP_FR_LOG_CHECK_STRIKE); 2974 } 2975 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, biggest_tsn_acked) || 2976 tp1->sent == SCTP_DATAGRAM_UNSENT) { 2977 /* done */ 2978 break; 2979 } 2980 if (stcb->asoc.prsctp_supported) { 2981 if ((PR_SCTP_TTL_ENABLED(tp1->flags)) && tp1->sent < SCTP_DATAGRAM_ACKED) { 2982 /* Is it expired? */ 2983 if (timevalcmp(&now, &tp1->rec.data.timetodrop, >)) { 2984 /* Yes so drop it */ 2985 if (tp1->data != NULL) { 2986 (void)sctp_release_pr_sctp_chunk(stcb, tp1, 1, 2987 SCTP_SO_NOT_LOCKED); 2988 } 2989 continue; 2990 } 2991 } 2992 } 2993 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, asoc->this_sack_highest_gap)) { 2994 /* we are beyond the tsn in the sack */ 2995 break; 2996 } 2997 if (tp1->sent >= SCTP_DATAGRAM_RESEND) { 2998 /* either a RESEND, ACKED, or MARKED */ 2999 /* skip */ 3000 if (tp1->sent == SCTP_FORWARD_TSN_SKIP) { 3001 /* Continue strikin FWD-TSN chunks */ 3002 tp1->rec.data.fwd_tsn_cnt++; 3003 } 3004 continue; 3005 } 3006 /* 3007 * CMT : SFR algo (covers part of DAC and HTNA as well) 3008 */ 3009 if (tp1->whoTo && tp1->whoTo->saw_newack == 0) { 3010 /* 3011 * No new acks were receieved for data sent to this 3012 * dest. Therefore, according to the SFR algo for 3013 * CMT, no data sent to this dest can be marked for 3014 * FR using this SACK. 3015 */ 3016 continue; 3017 } else if (tp1->whoTo && SCTP_TSN_GT(tp1->rec.data.TSN_seq, 3018 tp1->whoTo->this_sack_highest_newack)) { 3019 /* 3020 * CMT: New acks were receieved for data sent to 3021 * this dest. But no new acks were seen for data 3022 * sent after tp1. Therefore, according to the SFR 3023 * algo for CMT, tp1 cannot be marked for FR using 3024 * this SACK. This step covers part of the DAC algo 3025 * and the HTNA algo as well. 3026 */ 3027 continue; 3028 } 3029 /* 3030 * Here we check to see if we were have already done a FR 3031 * and if so we see if the biggest TSN we saw in the sack is 3032 * smaller than the recovery point. If so we don't strike 3033 * the tsn... otherwise we CAN strike the TSN. 3034 */ 3035 /* 3036 * @@@ JRI: Check for CMT if (accum_moved && 3037 * asoc->fast_retran_loss_recovery && (sctp_cmt_on_off == 3038 * 0)) { 3039 */ 3040 if (accum_moved && asoc->fast_retran_loss_recovery) { 3041 /* 3042 * Strike the TSN if in fast-recovery and cum-ack 3043 * moved. 3044 */ 3045 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3046 sctp_log_fr(biggest_tsn_newly_acked, 3047 tp1->rec.data.TSN_seq, 3048 tp1->sent, 3049 SCTP_FR_LOG_STRIKE_CHUNK); 3050 } 3051 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3052 tp1->sent++; 3053 } 3054 if ((asoc->sctp_cmt_on_off > 0) && 3055 SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) { 3056 /* 3057 * CMT DAC algorithm: If SACK flag is set to 3058 * 0, then lowest_newack test will not pass 3059 * because it would have been set to the 3060 * cumack earlier. If not already to be 3061 * rtx'd, If not a mixed sack and if tp1 is 3062 * not between two sacked TSNs, then mark by 3063 * one more. NOTE that we are marking by one 3064 * additional time since the SACK DAC flag 3065 * indicates that two packets have been 3066 * received after this missing TSN. 3067 */ 3068 if ((tp1->sent < SCTP_DATAGRAM_RESEND) && (num_dests_sacked == 1) && 3069 SCTP_TSN_GT(this_sack_lowest_newack, tp1->rec.data.TSN_seq)) { 3070 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3071 sctp_log_fr(16 + num_dests_sacked, 3072 tp1->rec.data.TSN_seq, 3073 tp1->sent, 3074 SCTP_FR_LOG_STRIKE_CHUNK); 3075 } 3076 tp1->sent++; 3077 } 3078 } 3079 } else if ((tp1->rec.data.doing_fast_retransmit) && 3080 (asoc->sctp_cmt_on_off == 0)) { 3081 /* 3082 * For those that have done a FR we must take 3083 * special consideration if we strike. I.e the 3084 * biggest_newly_acked must be higher than the 3085 * sending_seq at the time we did the FR. 3086 */ 3087 if ( 3088 #ifdef SCTP_FR_TO_ALTERNATE 3089 /* 3090 * If FR's go to new networks, then we must only do 3091 * this for singly homed asoc's. However if the FR's 3092 * go to the same network (Armando's work) then its 3093 * ok to FR multiple times. 3094 */ 3095 (asoc->numnets < 2) 3096 #else 3097 (1) 3098 #endif 3099 ) { 3100 3101 if (SCTP_TSN_GE(biggest_tsn_newly_acked, 3102 tp1->rec.data.fast_retran_tsn)) { 3103 /* 3104 * Strike the TSN, since this ack is 3105 * beyond where things were when we 3106 * did a FR. 3107 */ 3108 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3109 sctp_log_fr(biggest_tsn_newly_acked, 3110 tp1->rec.data.TSN_seq, 3111 tp1->sent, 3112 SCTP_FR_LOG_STRIKE_CHUNK); 3113 } 3114 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3115 tp1->sent++; 3116 } 3117 strike_flag = 1; 3118 if ((asoc->sctp_cmt_on_off > 0) && 3119 SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) { 3120 /* 3121 * CMT DAC algorithm: If 3122 * SACK flag is set to 0, 3123 * then lowest_newack test 3124 * will not pass because it 3125 * would have been set to 3126 * the cumack earlier. If 3127 * not already to be rtx'd, 3128 * If not a mixed sack and 3129 * if tp1 is not between two 3130 * sacked TSNs, then mark by 3131 * one more. NOTE that we 3132 * are marking by one 3133 * additional time since the 3134 * SACK DAC flag indicates 3135 * that two packets have 3136 * been received after this 3137 * missing TSN. 3138 */ 3139 if ((tp1->sent < SCTP_DATAGRAM_RESEND) && 3140 (num_dests_sacked == 1) && 3141 SCTP_TSN_GT(this_sack_lowest_newack, 3142 tp1->rec.data.TSN_seq)) { 3143 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3144 sctp_log_fr(32 + num_dests_sacked, 3145 tp1->rec.data.TSN_seq, 3146 tp1->sent, 3147 SCTP_FR_LOG_STRIKE_CHUNK); 3148 } 3149 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3150 tp1->sent++; 3151 } 3152 } 3153 } 3154 } 3155 } 3156 /* 3157 * JRI: TODO: remove code for HTNA algo. CMT's SFR 3158 * algo covers HTNA. 3159 */ 3160 } else if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, 3161 biggest_tsn_newly_acked)) { 3162 /* 3163 * We don't strike these: This is the HTNA 3164 * algorithm i.e. we don't strike If our TSN is 3165 * larger than the Highest TSN Newly Acked. 3166 */ 3167 ; 3168 } else { 3169 /* Strike the TSN */ 3170 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3171 sctp_log_fr(biggest_tsn_newly_acked, 3172 tp1->rec.data.TSN_seq, 3173 tp1->sent, 3174 SCTP_FR_LOG_STRIKE_CHUNK); 3175 } 3176 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3177 tp1->sent++; 3178 } 3179 if ((asoc->sctp_cmt_on_off > 0) && 3180 SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) { 3181 /* 3182 * CMT DAC algorithm: If SACK flag is set to 3183 * 0, then lowest_newack test will not pass 3184 * because it would have been set to the 3185 * cumack earlier. If not already to be 3186 * rtx'd, If not a mixed sack and if tp1 is 3187 * not between two sacked TSNs, then mark by 3188 * one more. NOTE that we are marking by one 3189 * additional time since the SACK DAC flag 3190 * indicates that two packets have been 3191 * received after this missing TSN. 3192 */ 3193 if ((tp1->sent < SCTP_DATAGRAM_RESEND) && (num_dests_sacked == 1) && 3194 SCTP_TSN_GT(this_sack_lowest_newack, tp1->rec.data.TSN_seq)) { 3195 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3196 sctp_log_fr(48 + num_dests_sacked, 3197 tp1->rec.data.TSN_seq, 3198 tp1->sent, 3199 SCTP_FR_LOG_STRIKE_CHUNK); 3200 } 3201 tp1->sent++; 3202 } 3203 } 3204 } 3205 if (tp1->sent == SCTP_DATAGRAM_RESEND) { 3206 struct sctp_nets *alt; 3207 3208 /* fix counts and things */ 3209 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3210 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_RSND, 3211 (tp1->whoTo ? (tp1->whoTo->flight_size) : 0), 3212 tp1->book_size, 3213 (uintptr_t) tp1->whoTo, 3214 tp1->rec.data.TSN_seq); 3215 } 3216 if (tp1->whoTo) { 3217 tp1->whoTo->net_ack++; 3218 sctp_flight_size_decrease(tp1); 3219 if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) { 3220 (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo, 3221 tp1); 3222 } 3223 } 3224 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) { 3225 sctp_log_rwnd(SCTP_INCREASE_PEER_RWND, 3226 asoc->peers_rwnd, tp1->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)); 3227 } 3228 /* add back to the rwnd */ 3229 asoc->peers_rwnd += (tp1->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)); 3230 3231 /* remove from the total flight */ 3232 sctp_total_flight_decrease(stcb, tp1); 3233 3234 if ((stcb->asoc.prsctp_supported) && 3235 (PR_SCTP_RTX_ENABLED(tp1->flags))) { 3236 /* 3237 * Has it been retransmitted tv_sec times? - 3238 * we store the retran count there. 3239 */ 3240 if (tp1->snd_count > tp1->rec.data.timetodrop.tv_sec) { 3241 /* Yes, so drop it */ 3242 if (tp1->data != NULL) { 3243 (void)sctp_release_pr_sctp_chunk(stcb, tp1, 1, 3244 SCTP_SO_NOT_LOCKED); 3245 } 3246 /* Make sure to flag we had a FR */ 3247 tp1->whoTo->net_ack++; 3248 continue; 3249 } 3250 } 3251 /* 3252 * SCTP_PRINTF("OK, we are now ready to FR this 3253 * guy\n"); 3254 */ 3255 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3256 sctp_log_fr(tp1->rec.data.TSN_seq, tp1->snd_count, 3257 0, SCTP_FR_MARKED); 3258 } 3259 if (strike_flag) { 3260 /* This is a subsequent FR */ 3261 SCTP_STAT_INCR(sctps_sendmultfastretrans); 3262 } 3263 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3264 if (asoc->sctp_cmt_on_off > 0) { 3265 /* 3266 * CMT: Using RTX_SSTHRESH policy for CMT. 3267 * If CMT is being used, then pick dest with 3268 * largest ssthresh for any retransmission. 3269 */ 3270 tp1->no_fr_allowed = 1; 3271 alt = tp1->whoTo; 3272 /* sa_ignore NO_NULL_CHK */ 3273 if (asoc->sctp_cmt_pf > 0) { 3274 /* 3275 * JRS 5/18/07 - If CMT PF is on, 3276 * use the PF version of 3277 * find_alt_net() 3278 */ 3279 alt = sctp_find_alternate_net(stcb, alt, 2); 3280 } else { 3281 /* 3282 * JRS 5/18/07 - If only CMT is on, 3283 * use the CMT version of 3284 * find_alt_net() 3285 */ 3286 /* sa_ignore NO_NULL_CHK */ 3287 alt = sctp_find_alternate_net(stcb, alt, 1); 3288 } 3289 if (alt == NULL) { 3290 alt = tp1->whoTo; 3291 } 3292 /* 3293 * CUCv2: If a different dest is picked for 3294 * the retransmission, then new 3295 * (rtx-)pseudo_cumack needs to be tracked 3296 * for orig dest. Let CUCv2 track new (rtx-) 3297 * pseudo-cumack always. 3298 */ 3299 if (tp1->whoTo) { 3300 tp1->whoTo->find_pseudo_cumack = 1; 3301 tp1->whoTo->find_rtx_pseudo_cumack = 1; 3302 } 3303 } else {/* CMT is OFF */ 3304 3305 #ifdef SCTP_FR_TO_ALTERNATE 3306 /* Can we find an alternate? */ 3307 alt = sctp_find_alternate_net(stcb, tp1->whoTo, 0); 3308 #else 3309 /* 3310 * default behavior is to NOT retransmit 3311 * FR's to an alternate. Armando Caro's 3312 * paper details why. 3313 */ 3314 alt = tp1->whoTo; 3315 #endif 3316 } 3317 3318 tp1->rec.data.doing_fast_retransmit = 1; 3319 tot_retrans++; 3320 /* mark the sending seq for possible subsequent FR's */ 3321 /* 3322 * SCTP_PRINTF("Marking TSN for FR new value %x\n", 3323 * (uint32_t)tpi->rec.data.TSN_seq); 3324 */ 3325 if (TAILQ_EMPTY(&asoc->send_queue)) { 3326 /* 3327 * If the queue of send is empty then its 3328 * the next sequence number that will be 3329 * assigned so we subtract one from this to 3330 * get the one we last sent. 3331 */ 3332 tp1->rec.data.fast_retran_tsn = sending_seq; 3333 } else { 3334 /* 3335 * If there are chunks on the send queue 3336 * (unsent data that has made it from the 3337 * stream queues but not out the door, we 3338 * take the first one (which will have the 3339 * lowest TSN) and subtract one to get the 3340 * one we last sent. 3341 */ 3342 struct sctp_tmit_chunk *ttt; 3343 3344 ttt = TAILQ_FIRST(&asoc->send_queue); 3345 tp1->rec.data.fast_retran_tsn = 3346 ttt->rec.data.TSN_seq; 3347 } 3348 3349 if (tp1->do_rtt) { 3350 /* 3351 * this guy had a RTO calculation pending on 3352 * it, cancel it 3353 */ 3354 if ((tp1->whoTo != NULL) && 3355 (tp1->whoTo->rto_needed == 0)) { 3356 tp1->whoTo->rto_needed = 1; 3357 } 3358 tp1->do_rtt = 0; 3359 } 3360 if (alt != tp1->whoTo) { 3361 /* yes, there is an alternate. */ 3362 sctp_free_remote_addr(tp1->whoTo); 3363 /* sa_ignore FREED_MEMORY */ 3364 tp1->whoTo = alt; 3365 atomic_add_int(&alt->ref_count, 1); 3366 } 3367 } 3368 } 3369 } 3370 3371 struct sctp_tmit_chunk * 3372 sctp_try_advance_peer_ack_point(struct sctp_tcb *stcb, 3373 struct sctp_association *asoc) 3374 { 3375 struct sctp_tmit_chunk *tp1, *tp2, *a_adv = NULL; 3376 struct timeval now; 3377 int now_filled = 0; 3378 3379 if (asoc->prsctp_supported == 0) { 3380 return (NULL); 3381 } 3382 TAILQ_FOREACH_SAFE(tp1, &asoc->sent_queue, sctp_next, tp2) { 3383 if (tp1->sent != SCTP_FORWARD_TSN_SKIP && 3384 tp1->sent != SCTP_DATAGRAM_RESEND && 3385 tp1->sent != SCTP_DATAGRAM_NR_ACKED) { 3386 /* no chance to advance, out of here */ 3387 break; 3388 } 3389 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) { 3390 if ((tp1->sent == SCTP_FORWARD_TSN_SKIP) || 3391 (tp1->sent == SCTP_DATAGRAM_NR_ACKED)) { 3392 sctp_misc_ints(SCTP_FWD_TSN_CHECK, 3393 asoc->advanced_peer_ack_point, 3394 tp1->rec.data.TSN_seq, 0, 0); 3395 } 3396 } 3397 if (!PR_SCTP_ENABLED(tp1->flags)) { 3398 /* 3399 * We can't fwd-tsn past any that are reliable aka 3400 * retransmitted until the asoc fails. 3401 */ 3402 break; 3403 } 3404 if (!now_filled) { 3405 (void)SCTP_GETTIME_TIMEVAL(&now); 3406 now_filled = 1; 3407 } 3408 /* 3409 * now we got a chunk which is marked for another 3410 * retransmission to a PR-stream but has run out its chances 3411 * already maybe OR has been marked to skip now. Can we skip 3412 * it if its a resend? 3413 */ 3414 if (tp1->sent == SCTP_DATAGRAM_RESEND && 3415 (PR_SCTP_TTL_ENABLED(tp1->flags))) { 3416 /* 3417 * Now is this one marked for resend and its time is 3418 * now up? 3419 */ 3420 if (timevalcmp(&now, &tp1->rec.data.timetodrop, >)) { 3421 /* Yes so drop it */ 3422 if (tp1->data) { 3423 (void)sctp_release_pr_sctp_chunk(stcb, tp1, 3424 1, SCTP_SO_NOT_LOCKED); 3425 } 3426 } else { 3427 /* 3428 * No, we are done when hit one for resend 3429 * whos time as not expired. 3430 */ 3431 break; 3432 } 3433 } 3434 /* 3435 * Ok now if this chunk is marked to drop it we can clean up 3436 * the chunk, advance our peer ack point and we can check 3437 * the next chunk. 3438 */ 3439 if ((tp1->sent == SCTP_FORWARD_TSN_SKIP) || 3440 (tp1->sent == SCTP_DATAGRAM_NR_ACKED)) { 3441 /* advance PeerAckPoint goes forward */ 3442 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, asoc->advanced_peer_ack_point)) { 3443 asoc->advanced_peer_ack_point = tp1->rec.data.TSN_seq; 3444 a_adv = tp1; 3445 } else if (tp1->rec.data.TSN_seq == asoc->advanced_peer_ack_point) { 3446 /* No update but we do save the chk */ 3447 a_adv = tp1; 3448 } 3449 } else { 3450 /* 3451 * If it is still in RESEND we can advance no 3452 * further 3453 */ 3454 break; 3455 } 3456 } 3457 return (a_adv); 3458 } 3459 3460 static int 3461 sctp_fs_audit(struct sctp_association *asoc) 3462 { 3463 struct sctp_tmit_chunk *chk; 3464 int inflight = 0, resend = 0, inbetween = 0, acked = 0, above = 0; 3465 int entry_flight, entry_cnt, ret; 3466 3467 entry_flight = asoc->total_flight; 3468 entry_cnt = asoc->total_flight_count; 3469 ret = 0; 3470 3471 if (asoc->pr_sctp_cnt >= asoc->sent_queue_cnt) 3472 return (0); 3473 3474 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) { 3475 if (chk->sent < SCTP_DATAGRAM_RESEND) { 3476 SCTP_PRINTF("Chk TSN:%u size:%d inflight cnt:%d\n", 3477 chk->rec.data.TSN_seq, 3478 chk->send_size, 3479 chk->snd_count); 3480 inflight++; 3481 } else if (chk->sent == SCTP_DATAGRAM_RESEND) { 3482 resend++; 3483 } else if (chk->sent < SCTP_DATAGRAM_ACKED) { 3484 inbetween++; 3485 } else if (chk->sent > SCTP_DATAGRAM_ACKED) { 3486 above++; 3487 } else { 3488 acked++; 3489 } 3490 } 3491 3492 if ((inflight > 0) || (inbetween > 0)) { 3493 #ifdef INVARIANTS 3494 panic("Flight size-express incorrect? \n"); 3495 #else 3496 SCTP_PRINTF("asoc->total_flight:%d cnt:%d\n", 3497 entry_flight, entry_cnt); 3498 3499 SCTP_PRINTF("Flight size-express incorrect F:%d I:%d R:%d Ab:%d ACK:%d\n", 3500 inflight, inbetween, resend, above, acked); 3501 ret = 1; 3502 #endif 3503 } 3504 return (ret); 3505 } 3506 3507 3508 static void 3509 sctp_window_probe_recovery(struct sctp_tcb *stcb, 3510 struct sctp_association *asoc, 3511 struct sctp_tmit_chunk *tp1) 3512 { 3513 tp1->window_probe = 0; 3514 if ((tp1->sent >= SCTP_DATAGRAM_ACKED) || (tp1->data == NULL)) { 3515 /* TSN's skipped we do NOT move back. */ 3516 sctp_misc_ints(SCTP_FLIGHT_LOG_DWN_WP_FWD, 3517 tp1->whoTo ? tp1->whoTo->flight_size : 0, 3518 tp1->book_size, 3519 (uintptr_t) tp1->whoTo, 3520 tp1->rec.data.TSN_seq); 3521 return; 3522 } 3523 /* First setup this by shrinking flight */ 3524 if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) { 3525 (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo, 3526 tp1); 3527 } 3528 sctp_flight_size_decrease(tp1); 3529 sctp_total_flight_decrease(stcb, tp1); 3530 /* Now mark for resend */ 3531 tp1->sent = SCTP_DATAGRAM_RESEND; 3532 sctp_ucount_incr(asoc->sent_queue_retran_cnt); 3533 3534 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3535 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_WP, 3536 tp1->whoTo->flight_size, 3537 tp1->book_size, 3538 (uintptr_t) tp1->whoTo, 3539 tp1->rec.data.TSN_seq); 3540 } 3541 } 3542 3543 void 3544 sctp_express_handle_sack(struct sctp_tcb *stcb, uint32_t cumack, 3545 uint32_t rwnd, int *abort_now, int ecne_seen) 3546 { 3547 struct sctp_nets *net; 3548 struct sctp_association *asoc; 3549 struct sctp_tmit_chunk *tp1, *tp2; 3550 uint32_t old_rwnd; 3551 int win_probe_recovery = 0; 3552 int win_probe_recovered = 0; 3553 int j, done_once = 0; 3554 int rto_ok = 1; 3555 3556 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_SACK_ARRIVALS_ENABLE) { 3557 sctp_misc_ints(SCTP_SACK_LOG_EXPRESS, cumack, 3558 rwnd, stcb->asoc.last_acked_seq, stcb->asoc.peers_rwnd); 3559 } 3560 SCTP_TCB_LOCK_ASSERT(stcb); 3561 #ifdef SCTP_ASOCLOG_OF_TSNS 3562 stcb->asoc.cumack_log[stcb->asoc.cumack_log_at] = cumack; 3563 stcb->asoc.cumack_log_at++; 3564 if (stcb->asoc.cumack_log_at > SCTP_TSN_LOG_SIZE) { 3565 stcb->asoc.cumack_log_at = 0; 3566 } 3567 #endif 3568 asoc = &stcb->asoc; 3569 old_rwnd = asoc->peers_rwnd; 3570 if (SCTP_TSN_GT(asoc->last_acked_seq, cumack)) { 3571 /* old ack */ 3572 return; 3573 } else if (asoc->last_acked_seq == cumack) { 3574 /* Window update sack */ 3575 asoc->peers_rwnd = sctp_sbspace_sub(rwnd, 3576 (uint32_t) (asoc->total_flight + (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)))); 3577 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 3578 /* SWS sender side engages */ 3579 asoc->peers_rwnd = 0; 3580 } 3581 if (asoc->peers_rwnd > old_rwnd) { 3582 goto again; 3583 } 3584 return; 3585 } 3586 /* First setup for CC stuff */ 3587 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 3588 if (SCTP_TSN_GT(cumack, net->cwr_window_tsn)) { 3589 /* Drag along the window_tsn for cwr's */ 3590 net->cwr_window_tsn = cumack; 3591 } 3592 net->prev_cwnd = net->cwnd; 3593 net->net_ack = 0; 3594 net->net_ack2 = 0; 3595 3596 /* 3597 * CMT: Reset CUC and Fast recovery algo variables before 3598 * SACK processing 3599 */ 3600 net->new_pseudo_cumack = 0; 3601 net->will_exit_fast_recovery = 0; 3602 if (stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack) { 3603 (*stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack) (stcb, net); 3604 } 3605 } 3606 if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) { 3607 uint32_t send_s; 3608 3609 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 3610 tp1 = TAILQ_LAST(&asoc->sent_queue, 3611 sctpchunk_listhead); 3612 send_s = tp1->rec.data.TSN_seq + 1; 3613 } else { 3614 send_s = asoc->sending_seq; 3615 } 3616 if (SCTP_TSN_GE(cumack, send_s)) { 3617 #ifndef INVARIANTS 3618 struct mbuf *op_err; 3619 char msg[SCTP_DIAG_INFO_LEN]; 3620 3621 #endif 3622 #ifdef INVARIANTS 3623 panic("Impossible sack 1"); 3624 #else 3625 3626 *abort_now = 1; 3627 /* XXX */ 3628 snprintf(msg, sizeof(msg), "Cum ack %8.8x greater or equal then TSN %8.8x", 3629 cumack, send_s); 3630 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 3631 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_25; 3632 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 3633 return; 3634 #endif 3635 } 3636 } 3637 asoc->this_sack_highest_gap = cumack; 3638 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 3639 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 3640 stcb->asoc.overall_error_count, 3641 0, 3642 SCTP_FROM_SCTP_INDATA, 3643 __LINE__); 3644 } 3645 stcb->asoc.overall_error_count = 0; 3646 if (SCTP_TSN_GT(cumack, asoc->last_acked_seq)) { 3647 /* process the new consecutive TSN first */ 3648 TAILQ_FOREACH_SAFE(tp1, &asoc->sent_queue, sctp_next, tp2) { 3649 if (SCTP_TSN_GE(cumack, tp1->rec.data.TSN_seq)) { 3650 if (tp1->sent == SCTP_DATAGRAM_UNSENT) { 3651 SCTP_PRINTF("Warning, an unsent is now acked?\n"); 3652 } 3653 if (tp1->sent < SCTP_DATAGRAM_ACKED) { 3654 /* 3655 * If it is less than ACKED, it is 3656 * now no-longer in flight. Higher 3657 * values may occur during marking 3658 */ 3659 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3660 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3661 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_CA, 3662 tp1->whoTo->flight_size, 3663 tp1->book_size, 3664 (uintptr_t) tp1->whoTo, 3665 tp1->rec.data.TSN_seq); 3666 } 3667 sctp_flight_size_decrease(tp1); 3668 if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) { 3669 (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo, 3670 tp1); 3671 } 3672 /* sa_ignore NO_NULL_CHK */ 3673 sctp_total_flight_decrease(stcb, tp1); 3674 } 3675 tp1->whoTo->net_ack += tp1->send_size; 3676 if (tp1->snd_count < 2) { 3677 /* 3678 * True non-retransmited 3679 * chunk 3680 */ 3681 tp1->whoTo->net_ack2 += 3682 tp1->send_size; 3683 3684 /* update RTO too? */ 3685 if (tp1->do_rtt) { 3686 if (rto_ok) { 3687 tp1->whoTo->RTO = 3688 /* 3689 * sa_ignore 3690 * NO_NULL_CH 3691 * K 3692 */ 3693 sctp_calculate_rto(stcb, 3694 asoc, tp1->whoTo, 3695 &tp1->sent_rcv_time, 3696 sctp_align_safe_nocopy, 3697 SCTP_RTT_FROM_DATA); 3698 rto_ok = 0; 3699 } 3700 if (tp1->whoTo->rto_needed == 0) { 3701 tp1->whoTo->rto_needed = 1; 3702 } 3703 tp1->do_rtt = 0; 3704 } 3705 } 3706 /* 3707 * CMT: CUCv2 algorithm. From the 3708 * cumack'd TSNs, for each TSN being 3709 * acked for the first time, set the 3710 * following variables for the 3711 * corresp destination. 3712 * new_pseudo_cumack will trigger a 3713 * cwnd update. 3714 * find_(rtx_)pseudo_cumack will 3715 * trigger search for the next 3716 * expected (rtx-)pseudo-cumack. 3717 */ 3718 tp1->whoTo->new_pseudo_cumack = 1; 3719 tp1->whoTo->find_pseudo_cumack = 1; 3720 tp1->whoTo->find_rtx_pseudo_cumack = 1; 3721 3722 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 3723 /* sa_ignore NO_NULL_CHK */ 3724 sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK); 3725 } 3726 } 3727 if (tp1->sent == SCTP_DATAGRAM_RESEND) { 3728 sctp_ucount_decr(asoc->sent_queue_retran_cnt); 3729 } 3730 if (tp1->rec.data.chunk_was_revoked) { 3731 /* deflate the cwnd */ 3732 tp1->whoTo->cwnd -= tp1->book_size; 3733 tp1->rec.data.chunk_was_revoked = 0; 3734 } 3735 if (tp1->sent != SCTP_DATAGRAM_NR_ACKED) { 3736 if (asoc->strmout[tp1->rec.data.stream_number].chunks_on_queues > 0) { 3737 asoc->strmout[tp1->rec.data.stream_number].chunks_on_queues--; 3738 #ifdef INVARIANTS 3739 } else { 3740 panic("No chunks on the queues for sid %u.", tp1->rec.data.stream_number); 3741 #endif 3742 } 3743 } 3744 TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next); 3745 if (tp1->data) { 3746 /* sa_ignore NO_NULL_CHK */ 3747 sctp_free_bufspace(stcb, asoc, tp1, 1); 3748 sctp_m_freem(tp1->data); 3749 tp1->data = NULL; 3750 } 3751 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 3752 sctp_log_sack(asoc->last_acked_seq, 3753 cumack, 3754 tp1->rec.data.TSN_seq, 3755 0, 3756 0, 3757 SCTP_LOG_FREE_SENT); 3758 } 3759 asoc->sent_queue_cnt--; 3760 sctp_free_a_chunk(stcb, tp1, SCTP_SO_NOT_LOCKED); 3761 } else { 3762 break; 3763 } 3764 } 3765 3766 } 3767 /* sa_ignore NO_NULL_CHK */ 3768 if (stcb->sctp_socket) { 3769 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3770 struct socket *so; 3771 3772 #endif 3773 SOCKBUF_LOCK(&stcb->sctp_socket->so_snd); 3774 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) { 3775 /* sa_ignore NO_NULL_CHK */ 3776 sctp_wakeup_log(stcb, 1, SCTP_WAKESND_FROM_SACK); 3777 } 3778 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3779 so = SCTP_INP_SO(stcb->sctp_ep); 3780 atomic_add_int(&stcb->asoc.refcnt, 1); 3781 SCTP_TCB_UNLOCK(stcb); 3782 SCTP_SOCKET_LOCK(so, 1); 3783 SCTP_TCB_LOCK(stcb); 3784 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3785 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 3786 /* assoc was freed while we were unlocked */ 3787 SCTP_SOCKET_UNLOCK(so, 1); 3788 return; 3789 } 3790 #endif 3791 sctp_sowwakeup_locked(stcb->sctp_ep, stcb->sctp_socket); 3792 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3793 SCTP_SOCKET_UNLOCK(so, 1); 3794 #endif 3795 } else { 3796 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) { 3797 sctp_wakeup_log(stcb, 1, SCTP_NOWAKE_FROM_SACK); 3798 } 3799 } 3800 3801 /* JRS - Use the congestion control given in the CC module */ 3802 if ((asoc->last_acked_seq != cumack) && (ecne_seen == 0)) { 3803 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 3804 if (net->net_ack2 > 0) { 3805 /* 3806 * Karn's rule applies to clearing error 3807 * count, this is optional. 3808 */ 3809 net->error_count = 0; 3810 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) { 3811 /* addr came good */ 3812 net->dest_state |= SCTP_ADDR_REACHABLE; 3813 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 3814 0, (void *)net, SCTP_SO_NOT_LOCKED); 3815 } 3816 if (net == stcb->asoc.primary_destination) { 3817 if (stcb->asoc.alternate) { 3818 /* 3819 * release the alternate, 3820 * primary is good 3821 */ 3822 sctp_free_remote_addr(stcb->asoc.alternate); 3823 stcb->asoc.alternate = NULL; 3824 } 3825 } 3826 if (net->dest_state & SCTP_ADDR_PF) { 3827 net->dest_state &= ~SCTP_ADDR_PF; 3828 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 3829 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 3830 asoc->cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 3831 /* Done with this net */ 3832 net->net_ack = 0; 3833 } 3834 /* restore any doubled timers */ 3835 net->RTO = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv; 3836 if (net->RTO < stcb->asoc.minrto) { 3837 net->RTO = stcb->asoc.minrto; 3838 } 3839 if (net->RTO > stcb->asoc.maxrto) { 3840 net->RTO = stcb->asoc.maxrto; 3841 } 3842 } 3843 } 3844 asoc->cc_functions.sctp_cwnd_update_after_sack(stcb, asoc, 1, 0, 0); 3845 } 3846 asoc->last_acked_seq = cumack; 3847 3848 if (TAILQ_EMPTY(&asoc->sent_queue)) { 3849 /* nothing left in-flight */ 3850 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 3851 net->flight_size = 0; 3852 net->partial_bytes_acked = 0; 3853 } 3854 asoc->total_flight = 0; 3855 asoc->total_flight_count = 0; 3856 } 3857 /* RWND update */ 3858 asoc->peers_rwnd = sctp_sbspace_sub(rwnd, 3859 (uint32_t) (asoc->total_flight + (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)))); 3860 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 3861 /* SWS sender side engages */ 3862 asoc->peers_rwnd = 0; 3863 } 3864 if (asoc->peers_rwnd > old_rwnd) { 3865 win_probe_recovery = 1; 3866 } 3867 /* Now assure a timer where data is queued at */ 3868 again: 3869 j = 0; 3870 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 3871 int to_ticks; 3872 3873 if (win_probe_recovery && (net->window_probe)) { 3874 win_probe_recovered = 1; 3875 /* 3876 * Find first chunk that was used with window probe 3877 * and clear the sent 3878 */ 3879 /* sa_ignore FREED_MEMORY */ 3880 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 3881 if (tp1->window_probe) { 3882 /* move back to data send queue */ 3883 sctp_window_probe_recovery(stcb, asoc, tp1); 3884 break; 3885 } 3886 } 3887 } 3888 if (net->RTO == 0) { 3889 to_ticks = MSEC_TO_TICKS(stcb->asoc.initial_rto); 3890 } else { 3891 to_ticks = MSEC_TO_TICKS(net->RTO); 3892 } 3893 if (net->flight_size) { 3894 j++; 3895 (void)SCTP_OS_TIMER_START(&net->rxt_timer.timer, to_ticks, 3896 sctp_timeout_handler, &net->rxt_timer); 3897 if (net->window_probe) { 3898 net->window_probe = 0; 3899 } 3900 } else { 3901 if (net->window_probe) { 3902 /* 3903 * In window probes we must assure a timer 3904 * is still running there 3905 */ 3906 net->window_probe = 0; 3907 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { 3908 SCTP_OS_TIMER_START(&net->rxt_timer.timer, to_ticks, 3909 sctp_timeout_handler, &net->rxt_timer); 3910 } 3911 } else if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { 3912 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3913 stcb, net, 3914 SCTP_FROM_SCTP_INDATA + SCTP_LOC_22); 3915 } 3916 } 3917 } 3918 if ((j == 0) && 3919 (!TAILQ_EMPTY(&asoc->sent_queue)) && 3920 (asoc->sent_queue_retran_cnt == 0) && 3921 (win_probe_recovered == 0) && 3922 (done_once == 0)) { 3923 /* 3924 * huh, this should not happen unless all packets are 3925 * PR-SCTP and marked to skip of course. 3926 */ 3927 if (sctp_fs_audit(asoc)) { 3928 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 3929 net->flight_size = 0; 3930 } 3931 asoc->total_flight = 0; 3932 asoc->total_flight_count = 0; 3933 asoc->sent_queue_retran_cnt = 0; 3934 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 3935 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3936 sctp_flight_size_increase(tp1); 3937 sctp_total_flight_increase(stcb, tp1); 3938 } else if (tp1->sent == SCTP_DATAGRAM_RESEND) { 3939 sctp_ucount_incr(asoc->sent_queue_retran_cnt); 3940 } 3941 } 3942 } 3943 done_once = 1; 3944 goto again; 3945 } 3946 /**********************************/ 3947 /* Now what about shutdown issues */ 3948 /**********************************/ 3949 if (TAILQ_EMPTY(&asoc->send_queue) && TAILQ_EMPTY(&asoc->sent_queue)) { 3950 /* nothing left on sendqueue.. consider done */ 3951 /* clean up */ 3952 if ((asoc->stream_queue_cnt == 1) && 3953 ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) || 3954 (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED)) && 3955 (asoc->locked_on_sending) 3956 ) { 3957 struct sctp_stream_queue_pending *sp; 3958 3959 /* 3960 * I may be in a state where we got all across.. but 3961 * cannot write more due to a shutdown... we abort 3962 * since the user did not indicate EOR in this case. 3963 * The sp will be cleaned during free of the asoc. 3964 */ 3965 sp = TAILQ_LAST(&((asoc->locked_on_sending)->outqueue), 3966 sctp_streamhead); 3967 if ((sp) && (sp->length == 0)) { 3968 /* Let cleanup code purge it */ 3969 if (sp->msg_is_complete) { 3970 asoc->stream_queue_cnt--; 3971 } else { 3972 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT; 3973 asoc->locked_on_sending = NULL; 3974 asoc->stream_queue_cnt--; 3975 } 3976 } 3977 } 3978 if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) && 3979 (asoc->stream_queue_cnt == 0)) { 3980 if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) { 3981 /* Need to abort here */ 3982 struct mbuf *op_err; 3983 3984 abort_out_now: 3985 *abort_now = 1; 3986 /* XXX */ 3987 op_err = sctp_generate_cause(SCTP_CAUSE_USER_INITIATED_ABT, ""); 3988 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_24; 3989 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 3990 } else { 3991 struct sctp_nets *netp; 3992 3993 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 3994 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 3995 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 3996 } 3997 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT); 3998 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 3999 sctp_stop_timers_for_shutdown(stcb); 4000 if (asoc->alternate) { 4001 netp = asoc->alternate; 4002 } else { 4003 netp = asoc->primary_destination; 4004 } 4005 sctp_send_shutdown(stcb, netp); 4006 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, 4007 stcb->sctp_ep, stcb, netp); 4008 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 4009 stcb->sctp_ep, stcb, netp); 4010 } 4011 } else if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) && 4012 (asoc->stream_queue_cnt == 0)) { 4013 struct sctp_nets *netp; 4014 4015 if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) { 4016 goto abort_out_now; 4017 } 4018 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 4019 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 4020 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 4021 sctp_stop_timers_for_shutdown(stcb); 4022 if (asoc->alternate) { 4023 netp = asoc->alternate; 4024 } else { 4025 netp = asoc->primary_destination; 4026 } 4027 sctp_send_shutdown_ack(stcb, netp); 4028 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, 4029 stcb->sctp_ep, stcb, netp); 4030 } 4031 } 4032 /*********************************************/ 4033 /* Here we perform PR-SCTP procedures */ 4034 /* (section 4.2) */ 4035 /*********************************************/ 4036 /* C1. update advancedPeerAckPoint */ 4037 if (SCTP_TSN_GT(cumack, asoc->advanced_peer_ack_point)) { 4038 asoc->advanced_peer_ack_point = cumack; 4039 } 4040 /* PR-Sctp issues need to be addressed too */ 4041 if ((asoc->prsctp_supported) && (asoc->pr_sctp_cnt > 0)) { 4042 struct sctp_tmit_chunk *lchk; 4043 uint32_t old_adv_peer_ack_point; 4044 4045 old_adv_peer_ack_point = asoc->advanced_peer_ack_point; 4046 lchk = sctp_try_advance_peer_ack_point(stcb, asoc); 4047 /* C3. See if we need to send a Fwd-TSN */ 4048 if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, cumack)) { 4049 /* 4050 * ISSUE with ECN, see FWD-TSN processing. 4051 */ 4052 if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, old_adv_peer_ack_point)) { 4053 send_forward_tsn(stcb, asoc); 4054 } else if (lchk) { 4055 /* try to FR fwd-tsn's that get lost too */ 4056 if (lchk->rec.data.fwd_tsn_cnt >= 3) { 4057 send_forward_tsn(stcb, asoc); 4058 } 4059 } 4060 } 4061 if (lchk) { 4062 /* Assure a timer is up */ 4063 sctp_timer_start(SCTP_TIMER_TYPE_SEND, 4064 stcb->sctp_ep, stcb, lchk->whoTo); 4065 } 4066 } 4067 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_RWND_LOGGING_ENABLE) { 4068 sctp_misc_ints(SCTP_SACK_RWND_UPDATE, 4069 rwnd, 4070 stcb->asoc.peers_rwnd, 4071 stcb->asoc.total_flight, 4072 stcb->asoc.total_output_queue_size); 4073 } 4074 } 4075 4076 void 4077 sctp_handle_sack(struct mbuf *m, int offset_seg, int offset_dup, 4078 struct sctp_tcb *stcb, 4079 uint16_t num_seg, uint16_t num_nr_seg, uint16_t num_dup, 4080 int *abort_now, uint8_t flags, 4081 uint32_t cum_ack, uint32_t rwnd, int ecne_seen) 4082 { 4083 struct sctp_association *asoc; 4084 struct sctp_tmit_chunk *tp1, *tp2; 4085 uint32_t last_tsn, biggest_tsn_acked, biggest_tsn_newly_acked, this_sack_lowest_newack; 4086 uint16_t wake_him = 0; 4087 uint32_t send_s = 0; 4088 long j; 4089 int accum_moved = 0; 4090 int will_exit_fast_recovery = 0; 4091 uint32_t a_rwnd, old_rwnd; 4092 int win_probe_recovery = 0; 4093 int win_probe_recovered = 0; 4094 struct sctp_nets *net = NULL; 4095 int done_once; 4096 int rto_ok = 1; 4097 uint8_t reneged_all = 0; 4098 uint8_t cmt_dac_flag; 4099 4100 /* 4101 * we take any chance we can to service our queues since we cannot 4102 * get awoken when the socket is read from :< 4103 */ 4104 /* 4105 * Now perform the actual SACK handling: 1) Verify that it is not an 4106 * old sack, if so discard. 2) If there is nothing left in the send 4107 * queue (cum-ack is equal to last acked) then you have a duplicate 4108 * too, update any rwnd change and verify no timers are running. 4109 * then return. 3) Process any new consequtive data i.e. cum-ack 4110 * moved process these first and note that it moved. 4) Process any 4111 * sack blocks. 5) Drop any acked from the queue. 6) Check for any 4112 * revoked blocks and mark. 7) Update the cwnd. 8) Nothing left, 4113 * sync up flightsizes and things, stop all timers and also check 4114 * for shutdown_pending state. If so then go ahead and send off the 4115 * shutdown. If in shutdown recv, send off the shutdown-ack and 4116 * start that timer, Ret. 9) Strike any non-acked things and do FR 4117 * procedure if needed being sure to set the FR flag. 10) Do pr-sctp 4118 * procedures. 11) Apply any FR penalties. 12) Assure we will SACK 4119 * if in shutdown_recv state. 4120 */ 4121 SCTP_TCB_LOCK_ASSERT(stcb); 4122 /* CMT DAC algo */ 4123 this_sack_lowest_newack = 0; 4124 SCTP_STAT_INCR(sctps_slowpath_sack); 4125 last_tsn = cum_ack; 4126 cmt_dac_flag = flags & SCTP_SACK_CMT_DAC; 4127 #ifdef SCTP_ASOCLOG_OF_TSNS 4128 stcb->asoc.cumack_log[stcb->asoc.cumack_log_at] = cum_ack; 4129 stcb->asoc.cumack_log_at++; 4130 if (stcb->asoc.cumack_log_at > SCTP_TSN_LOG_SIZE) { 4131 stcb->asoc.cumack_log_at = 0; 4132 } 4133 #endif 4134 a_rwnd = rwnd; 4135 4136 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_SACK_ARRIVALS_ENABLE) { 4137 sctp_misc_ints(SCTP_SACK_LOG_NORMAL, cum_ack, 4138 rwnd, stcb->asoc.last_acked_seq, stcb->asoc.peers_rwnd); 4139 } 4140 old_rwnd = stcb->asoc.peers_rwnd; 4141 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4142 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4143 stcb->asoc.overall_error_count, 4144 0, 4145 SCTP_FROM_SCTP_INDATA, 4146 __LINE__); 4147 } 4148 stcb->asoc.overall_error_count = 0; 4149 asoc = &stcb->asoc; 4150 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 4151 sctp_log_sack(asoc->last_acked_seq, 4152 cum_ack, 4153 0, 4154 num_seg, 4155 num_dup, 4156 SCTP_LOG_NEW_SACK); 4157 } 4158 if ((num_dup) && (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE)) { 4159 uint16_t i; 4160 uint32_t *dupdata, dblock; 4161 4162 for (i = 0; i < num_dup; i++) { 4163 dupdata = (uint32_t *) sctp_m_getptr(m, offset_dup + i * sizeof(uint32_t), 4164 sizeof(uint32_t), (uint8_t *) & dblock); 4165 if (dupdata == NULL) { 4166 break; 4167 } 4168 sctp_log_fr(*dupdata, 0, 0, SCTP_FR_DUPED); 4169 } 4170 } 4171 if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) { 4172 /* reality check */ 4173 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 4174 tp1 = TAILQ_LAST(&asoc->sent_queue, 4175 sctpchunk_listhead); 4176 send_s = tp1->rec.data.TSN_seq + 1; 4177 } else { 4178 tp1 = NULL; 4179 send_s = asoc->sending_seq; 4180 } 4181 if (SCTP_TSN_GE(cum_ack, send_s)) { 4182 struct mbuf *op_err; 4183 char msg[SCTP_DIAG_INFO_LEN]; 4184 4185 /* 4186 * no way, we have not even sent this TSN out yet. 4187 * Peer is hopelessly messed up with us. 4188 */ 4189 SCTP_PRINTF("NEW cum_ack:%x send_s:%x is smaller or equal\n", 4190 cum_ack, send_s); 4191 if (tp1) { 4192 SCTP_PRINTF("Got send_s from tsn:%x + 1 of tp1:%p\n", 4193 tp1->rec.data.TSN_seq, (void *)tp1); 4194 } 4195 hopeless_peer: 4196 *abort_now = 1; 4197 /* XXX */ 4198 snprintf(msg, sizeof(msg), "Cum ack %8.8x greater or equal then TSN %8.8x", 4199 cum_ack, send_s); 4200 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 4201 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_25; 4202 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 4203 return; 4204 } 4205 } 4206 /**********************/ 4207 /* 1) check the range */ 4208 /**********************/ 4209 if (SCTP_TSN_GT(asoc->last_acked_seq, last_tsn)) { 4210 /* acking something behind */ 4211 return; 4212 } 4213 /* update the Rwnd of the peer */ 4214 if (TAILQ_EMPTY(&asoc->sent_queue) && 4215 TAILQ_EMPTY(&asoc->send_queue) && 4216 (asoc->stream_queue_cnt == 0)) { 4217 /* nothing left on send/sent and strmq */ 4218 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) { 4219 sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK, 4220 asoc->peers_rwnd, 0, 0, a_rwnd); 4221 } 4222 asoc->peers_rwnd = a_rwnd; 4223 if (asoc->sent_queue_retran_cnt) { 4224 asoc->sent_queue_retran_cnt = 0; 4225 } 4226 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4227 /* SWS sender side engages */ 4228 asoc->peers_rwnd = 0; 4229 } 4230 /* stop any timers */ 4231 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4232 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 4233 stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_26); 4234 net->partial_bytes_acked = 0; 4235 net->flight_size = 0; 4236 } 4237 asoc->total_flight = 0; 4238 asoc->total_flight_count = 0; 4239 return; 4240 } 4241 /* 4242 * We init netAckSz and netAckSz2 to 0. These are used to track 2 4243 * things. The total byte count acked is tracked in netAckSz AND 4244 * netAck2 is used to track the total bytes acked that are un- 4245 * amibguious and were never retransmitted. We track these on a per 4246 * destination address basis. 4247 */ 4248 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4249 if (SCTP_TSN_GT(cum_ack, net->cwr_window_tsn)) { 4250 /* Drag along the window_tsn for cwr's */ 4251 net->cwr_window_tsn = cum_ack; 4252 } 4253 net->prev_cwnd = net->cwnd; 4254 net->net_ack = 0; 4255 net->net_ack2 = 0; 4256 4257 /* 4258 * CMT: Reset CUC and Fast recovery algo variables before 4259 * SACK processing 4260 */ 4261 net->new_pseudo_cumack = 0; 4262 net->will_exit_fast_recovery = 0; 4263 if (stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack) { 4264 (*stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack) (stcb, net); 4265 } 4266 } 4267 /* process the new consecutive TSN first */ 4268 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 4269 if (SCTP_TSN_GE(last_tsn, tp1->rec.data.TSN_seq)) { 4270 if (tp1->sent != SCTP_DATAGRAM_UNSENT) { 4271 accum_moved = 1; 4272 if (tp1->sent < SCTP_DATAGRAM_ACKED) { 4273 /* 4274 * If it is less than ACKED, it is 4275 * now no-longer in flight. Higher 4276 * values may occur during marking 4277 */ 4278 if ((tp1->whoTo->dest_state & 4279 SCTP_ADDR_UNCONFIRMED) && 4280 (tp1->snd_count < 2)) { 4281 /* 4282 * If there was no retran 4283 * and the address is 4284 * un-confirmed and we sent 4285 * there and are now 4286 * sacked.. its confirmed, 4287 * mark it so. 4288 */ 4289 tp1->whoTo->dest_state &= 4290 ~SCTP_ADDR_UNCONFIRMED; 4291 } 4292 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 4293 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 4294 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_CA, 4295 tp1->whoTo->flight_size, 4296 tp1->book_size, 4297 (uintptr_t) tp1->whoTo, 4298 tp1->rec.data.TSN_seq); 4299 } 4300 sctp_flight_size_decrease(tp1); 4301 sctp_total_flight_decrease(stcb, tp1); 4302 if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) { 4303 (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo, 4304 tp1); 4305 } 4306 } 4307 tp1->whoTo->net_ack += tp1->send_size; 4308 4309 /* CMT SFR and DAC algos */ 4310 this_sack_lowest_newack = tp1->rec.data.TSN_seq; 4311 tp1->whoTo->saw_newack = 1; 4312 4313 if (tp1->snd_count < 2) { 4314 /* 4315 * True non-retransmited 4316 * chunk 4317 */ 4318 tp1->whoTo->net_ack2 += 4319 tp1->send_size; 4320 4321 /* update RTO too? */ 4322 if (tp1->do_rtt) { 4323 if (rto_ok) { 4324 tp1->whoTo->RTO = 4325 sctp_calculate_rto(stcb, 4326 asoc, tp1->whoTo, 4327 &tp1->sent_rcv_time, 4328 sctp_align_safe_nocopy, 4329 SCTP_RTT_FROM_DATA); 4330 rto_ok = 0; 4331 } 4332 if (tp1->whoTo->rto_needed == 0) { 4333 tp1->whoTo->rto_needed = 1; 4334 } 4335 tp1->do_rtt = 0; 4336 } 4337 } 4338 /* 4339 * CMT: CUCv2 algorithm. From the 4340 * cumack'd TSNs, for each TSN being 4341 * acked for the first time, set the 4342 * following variables for the 4343 * corresp destination. 4344 * new_pseudo_cumack will trigger a 4345 * cwnd update. 4346 * find_(rtx_)pseudo_cumack will 4347 * trigger search for the next 4348 * expected (rtx-)pseudo-cumack. 4349 */ 4350 tp1->whoTo->new_pseudo_cumack = 1; 4351 tp1->whoTo->find_pseudo_cumack = 1; 4352 tp1->whoTo->find_rtx_pseudo_cumack = 1; 4353 4354 4355 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 4356 sctp_log_sack(asoc->last_acked_seq, 4357 cum_ack, 4358 tp1->rec.data.TSN_seq, 4359 0, 4360 0, 4361 SCTP_LOG_TSN_ACKED); 4362 } 4363 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 4364 sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK); 4365 } 4366 } 4367 if (tp1->sent == SCTP_DATAGRAM_RESEND) { 4368 sctp_ucount_decr(asoc->sent_queue_retran_cnt); 4369 #ifdef SCTP_AUDITING_ENABLED 4370 sctp_audit_log(0xB3, 4371 (asoc->sent_queue_retran_cnt & 0x000000ff)); 4372 #endif 4373 } 4374 if (tp1->rec.data.chunk_was_revoked) { 4375 /* deflate the cwnd */ 4376 tp1->whoTo->cwnd -= tp1->book_size; 4377 tp1->rec.data.chunk_was_revoked = 0; 4378 } 4379 if (tp1->sent != SCTP_DATAGRAM_NR_ACKED) { 4380 tp1->sent = SCTP_DATAGRAM_ACKED; 4381 } 4382 } 4383 } else { 4384 break; 4385 } 4386 } 4387 biggest_tsn_newly_acked = biggest_tsn_acked = last_tsn; 4388 /* always set this up to cum-ack */ 4389 asoc->this_sack_highest_gap = last_tsn; 4390 4391 if ((num_seg > 0) || (num_nr_seg > 0)) { 4392 4393 /* 4394 * CMT: SFR algo (and HTNA) - this_sack_highest_newack has 4395 * to be greater than the cumack. Also reset saw_newack to 0 4396 * for all dests. 4397 */ 4398 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4399 net->saw_newack = 0; 4400 net->this_sack_highest_newack = last_tsn; 4401 } 4402 4403 /* 4404 * thisSackHighestGap will increase while handling NEW 4405 * segments this_sack_highest_newack will increase while 4406 * handling NEWLY ACKED chunks. this_sack_lowest_newack is 4407 * used for CMT DAC algo. saw_newack will also change. 4408 */ 4409 if (sctp_handle_segments(m, &offset_seg, stcb, asoc, last_tsn, &biggest_tsn_acked, 4410 &biggest_tsn_newly_acked, &this_sack_lowest_newack, 4411 num_seg, num_nr_seg, &rto_ok)) { 4412 wake_him++; 4413 } 4414 if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) { 4415 /* 4416 * validate the biggest_tsn_acked in the gap acks if 4417 * strict adherence is wanted. 4418 */ 4419 if (SCTP_TSN_GE(biggest_tsn_acked, send_s)) { 4420 /* 4421 * peer is either confused or we are under 4422 * attack. We must abort. 4423 */ 4424 SCTP_PRINTF("Hopeless peer! biggest_tsn_acked:%x largest seq:%x\n", 4425 biggest_tsn_acked, send_s); 4426 goto hopeless_peer; 4427 } 4428 } 4429 } 4430 /*******************************************/ 4431 /* cancel ALL T3-send timer if accum moved */ 4432 /*******************************************/ 4433 if (asoc->sctp_cmt_on_off > 0) { 4434 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4435 if (net->new_pseudo_cumack) 4436 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 4437 stcb, net, 4438 SCTP_FROM_SCTP_INDATA + SCTP_LOC_27); 4439 4440 } 4441 } else { 4442 if (accum_moved) { 4443 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4444 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 4445 stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_28); 4446 } 4447 } 4448 } 4449 /********************************************/ 4450 /* drop the acked chunks from the sentqueue */ 4451 /********************************************/ 4452 asoc->last_acked_seq = cum_ack; 4453 4454 TAILQ_FOREACH_SAFE(tp1, &asoc->sent_queue, sctp_next, tp2) { 4455 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, cum_ack)) { 4456 break; 4457 } 4458 if (tp1->sent != SCTP_DATAGRAM_NR_ACKED) { 4459 if (asoc->strmout[tp1->rec.data.stream_number].chunks_on_queues > 0) { 4460 asoc->strmout[tp1->rec.data.stream_number].chunks_on_queues--; 4461 #ifdef INVARIANTS 4462 } else { 4463 panic("No chunks on the queues for sid %u.", tp1->rec.data.stream_number); 4464 #endif 4465 } 4466 } 4467 TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next); 4468 if (PR_SCTP_ENABLED(tp1->flags)) { 4469 if (asoc->pr_sctp_cnt != 0) 4470 asoc->pr_sctp_cnt--; 4471 } 4472 asoc->sent_queue_cnt--; 4473 if (tp1->data) { 4474 /* sa_ignore NO_NULL_CHK */ 4475 sctp_free_bufspace(stcb, asoc, tp1, 1); 4476 sctp_m_freem(tp1->data); 4477 tp1->data = NULL; 4478 if (asoc->prsctp_supported && PR_SCTP_BUF_ENABLED(tp1->flags)) { 4479 asoc->sent_queue_cnt_removeable--; 4480 } 4481 } 4482 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 4483 sctp_log_sack(asoc->last_acked_seq, 4484 cum_ack, 4485 tp1->rec.data.TSN_seq, 4486 0, 4487 0, 4488 SCTP_LOG_FREE_SENT); 4489 } 4490 sctp_free_a_chunk(stcb, tp1, SCTP_SO_NOT_LOCKED); 4491 wake_him++; 4492 } 4493 if (TAILQ_EMPTY(&asoc->sent_queue) && (asoc->total_flight > 0)) { 4494 #ifdef INVARIANTS 4495 panic("Warning flight size is postive and should be 0"); 4496 #else 4497 SCTP_PRINTF("Warning flight size incorrect should be 0 is %d\n", 4498 asoc->total_flight); 4499 #endif 4500 asoc->total_flight = 0; 4501 } 4502 /* sa_ignore NO_NULL_CHK */ 4503 if ((wake_him) && (stcb->sctp_socket)) { 4504 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4505 struct socket *so; 4506 4507 #endif 4508 SOCKBUF_LOCK(&stcb->sctp_socket->so_snd); 4509 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) { 4510 sctp_wakeup_log(stcb, wake_him, SCTP_WAKESND_FROM_SACK); 4511 } 4512 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4513 so = SCTP_INP_SO(stcb->sctp_ep); 4514 atomic_add_int(&stcb->asoc.refcnt, 1); 4515 SCTP_TCB_UNLOCK(stcb); 4516 SCTP_SOCKET_LOCK(so, 1); 4517 SCTP_TCB_LOCK(stcb); 4518 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4519 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 4520 /* assoc was freed while we were unlocked */ 4521 SCTP_SOCKET_UNLOCK(so, 1); 4522 return; 4523 } 4524 #endif 4525 sctp_sowwakeup_locked(stcb->sctp_ep, stcb->sctp_socket); 4526 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4527 SCTP_SOCKET_UNLOCK(so, 1); 4528 #endif 4529 } else { 4530 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) { 4531 sctp_wakeup_log(stcb, wake_him, SCTP_NOWAKE_FROM_SACK); 4532 } 4533 } 4534 4535 if (asoc->fast_retran_loss_recovery && accum_moved) { 4536 if (SCTP_TSN_GE(asoc->last_acked_seq, asoc->fast_recovery_tsn)) { 4537 /* Setup so we will exit RFC2582 fast recovery */ 4538 will_exit_fast_recovery = 1; 4539 } 4540 } 4541 /* 4542 * Check for revoked fragments: 4543 * 4544 * if Previous sack - Had no frags then we can't have any revoked if 4545 * Previous sack - Had frag's then - If we now have frags aka 4546 * num_seg > 0 call sctp_check_for_revoked() to tell if peer revoked 4547 * some of them. else - The peer revoked all ACKED fragments, since 4548 * we had some before and now we have NONE. 4549 */ 4550 4551 if (num_seg) { 4552 sctp_check_for_revoked(stcb, asoc, cum_ack, biggest_tsn_acked); 4553 asoc->saw_sack_with_frags = 1; 4554 } else if (asoc->saw_sack_with_frags) { 4555 int cnt_revoked = 0; 4556 4557 /* Peer revoked all dg's marked or acked */ 4558 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 4559 if (tp1->sent == SCTP_DATAGRAM_ACKED) { 4560 tp1->sent = SCTP_DATAGRAM_SENT; 4561 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 4562 sctp_misc_ints(SCTP_FLIGHT_LOG_UP_REVOKE, 4563 tp1->whoTo->flight_size, 4564 tp1->book_size, 4565 (uintptr_t) tp1->whoTo, 4566 tp1->rec.data.TSN_seq); 4567 } 4568 sctp_flight_size_increase(tp1); 4569 sctp_total_flight_increase(stcb, tp1); 4570 tp1->rec.data.chunk_was_revoked = 1; 4571 /* 4572 * To ensure that this increase in 4573 * flightsize, which is artificial, does not 4574 * throttle the sender, we also increase the 4575 * cwnd artificially. 4576 */ 4577 tp1->whoTo->cwnd += tp1->book_size; 4578 cnt_revoked++; 4579 } 4580 } 4581 if (cnt_revoked) { 4582 reneged_all = 1; 4583 } 4584 asoc->saw_sack_with_frags = 0; 4585 } 4586 if (num_nr_seg > 0) 4587 asoc->saw_sack_with_nr_frags = 1; 4588 else 4589 asoc->saw_sack_with_nr_frags = 0; 4590 4591 /* JRS - Use the congestion control given in the CC module */ 4592 if (ecne_seen == 0) { 4593 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4594 if (net->net_ack2 > 0) { 4595 /* 4596 * Karn's rule applies to clearing error 4597 * count, this is optional. 4598 */ 4599 net->error_count = 0; 4600 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) { 4601 /* addr came good */ 4602 net->dest_state |= SCTP_ADDR_REACHABLE; 4603 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 4604 0, (void *)net, SCTP_SO_NOT_LOCKED); 4605 } 4606 if (net == stcb->asoc.primary_destination) { 4607 if (stcb->asoc.alternate) { 4608 /* 4609 * release the alternate, 4610 * primary is good 4611 */ 4612 sctp_free_remote_addr(stcb->asoc.alternate); 4613 stcb->asoc.alternate = NULL; 4614 } 4615 } 4616 if (net->dest_state & SCTP_ADDR_PF) { 4617 net->dest_state &= ~SCTP_ADDR_PF; 4618 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 4619 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 4620 asoc->cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 4621 /* Done with this net */ 4622 net->net_ack = 0; 4623 } 4624 /* restore any doubled timers */ 4625 net->RTO = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv; 4626 if (net->RTO < stcb->asoc.minrto) { 4627 net->RTO = stcb->asoc.minrto; 4628 } 4629 if (net->RTO > stcb->asoc.maxrto) { 4630 net->RTO = stcb->asoc.maxrto; 4631 } 4632 } 4633 } 4634 asoc->cc_functions.sctp_cwnd_update_after_sack(stcb, asoc, accum_moved, reneged_all, will_exit_fast_recovery); 4635 } 4636 if (TAILQ_EMPTY(&asoc->sent_queue)) { 4637 /* nothing left in-flight */ 4638 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4639 /* stop all timers */ 4640 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 4641 stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_30); 4642 net->flight_size = 0; 4643 net->partial_bytes_acked = 0; 4644 } 4645 asoc->total_flight = 0; 4646 asoc->total_flight_count = 0; 4647 } 4648 /**********************************/ 4649 /* Now what about shutdown issues */ 4650 /**********************************/ 4651 if (TAILQ_EMPTY(&asoc->send_queue) && TAILQ_EMPTY(&asoc->sent_queue)) { 4652 /* nothing left on sendqueue.. consider done */ 4653 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) { 4654 sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK, 4655 asoc->peers_rwnd, 0, 0, a_rwnd); 4656 } 4657 asoc->peers_rwnd = a_rwnd; 4658 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4659 /* SWS sender side engages */ 4660 asoc->peers_rwnd = 0; 4661 } 4662 /* clean up */ 4663 if ((asoc->stream_queue_cnt == 1) && 4664 ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) || 4665 (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED)) && 4666 (asoc->locked_on_sending) 4667 ) { 4668 struct sctp_stream_queue_pending *sp; 4669 4670 /* 4671 * I may be in a state where we got all across.. but 4672 * cannot write more due to a shutdown... we abort 4673 * since the user did not indicate EOR in this case. 4674 */ 4675 sp = TAILQ_LAST(&((asoc->locked_on_sending)->outqueue), 4676 sctp_streamhead); 4677 if ((sp) && (sp->length == 0)) { 4678 asoc->locked_on_sending = NULL; 4679 if (sp->msg_is_complete) { 4680 asoc->stream_queue_cnt--; 4681 } else { 4682 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT; 4683 asoc->stream_queue_cnt--; 4684 } 4685 } 4686 } 4687 if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) && 4688 (asoc->stream_queue_cnt == 0)) { 4689 if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) { 4690 /* Need to abort here */ 4691 struct mbuf *op_err; 4692 4693 abort_out_now: 4694 *abort_now = 1; 4695 /* XXX */ 4696 op_err = sctp_generate_cause(SCTP_CAUSE_USER_INITIATED_ABT, ""); 4697 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_31; 4698 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 4699 return; 4700 } else { 4701 struct sctp_nets *netp; 4702 4703 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 4704 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 4705 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 4706 } 4707 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT); 4708 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 4709 sctp_stop_timers_for_shutdown(stcb); 4710 if (asoc->alternate) { 4711 netp = asoc->alternate; 4712 } else { 4713 netp = asoc->primary_destination; 4714 } 4715 sctp_send_shutdown(stcb, netp); 4716 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, 4717 stcb->sctp_ep, stcb, netp); 4718 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 4719 stcb->sctp_ep, stcb, netp); 4720 } 4721 return; 4722 } else if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) && 4723 (asoc->stream_queue_cnt == 0)) { 4724 struct sctp_nets *netp; 4725 4726 if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) { 4727 goto abort_out_now; 4728 } 4729 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 4730 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 4731 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 4732 sctp_stop_timers_for_shutdown(stcb); 4733 if (asoc->alternate) { 4734 netp = asoc->alternate; 4735 } else { 4736 netp = asoc->primary_destination; 4737 } 4738 sctp_send_shutdown_ack(stcb, netp); 4739 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, 4740 stcb->sctp_ep, stcb, netp); 4741 return; 4742 } 4743 } 4744 /* 4745 * Now here we are going to recycle net_ack for a different use... 4746 * HEADS UP. 4747 */ 4748 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4749 net->net_ack = 0; 4750 } 4751 4752 /* 4753 * CMT DAC algorithm: If SACK DAC flag was 0, then no extra marking 4754 * to be done. Setting this_sack_lowest_newack to the cum_ack will 4755 * automatically ensure that. 4756 */ 4757 if ((asoc->sctp_cmt_on_off > 0) && 4758 SCTP_BASE_SYSCTL(sctp_cmt_use_dac) && 4759 (cmt_dac_flag == 0)) { 4760 this_sack_lowest_newack = cum_ack; 4761 } 4762 if ((num_seg > 0) || (num_nr_seg > 0)) { 4763 sctp_strike_gap_ack_chunks(stcb, asoc, biggest_tsn_acked, 4764 biggest_tsn_newly_acked, this_sack_lowest_newack, accum_moved); 4765 } 4766 /* JRS - Use the congestion control given in the CC module */ 4767 asoc->cc_functions.sctp_cwnd_update_after_fr(stcb, asoc); 4768 4769 /* Now are we exiting loss recovery ? */ 4770 if (will_exit_fast_recovery) { 4771 /* Ok, we must exit fast recovery */ 4772 asoc->fast_retran_loss_recovery = 0; 4773 } 4774 if ((asoc->sat_t3_loss_recovery) && 4775 SCTP_TSN_GE(asoc->last_acked_seq, asoc->sat_t3_recovery_tsn)) { 4776 /* end satellite t3 loss recovery */ 4777 asoc->sat_t3_loss_recovery = 0; 4778 } 4779 /* 4780 * CMT Fast recovery 4781 */ 4782 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4783 if (net->will_exit_fast_recovery) { 4784 /* Ok, we must exit fast recovery */ 4785 net->fast_retran_loss_recovery = 0; 4786 } 4787 } 4788 4789 /* Adjust and set the new rwnd value */ 4790 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) { 4791 sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK, 4792 asoc->peers_rwnd, asoc->total_flight, (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)), a_rwnd); 4793 } 4794 asoc->peers_rwnd = sctp_sbspace_sub(a_rwnd, 4795 (uint32_t) (asoc->total_flight + (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)))); 4796 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4797 /* SWS sender side engages */ 4798 asoc->peers_rwnd = 0; 4799 } 4800 if (asoc->peers_rwnd > old_rwnd) { 4801 win_probe_recovery = 1; 4802 } 4803 /* 4804 * Now we must setup so we have a timer up for anyone with 4805 * outstanding data. 4806 */ 4807 done_once = 0; 4808 again: 4809 j = 0; 4810 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4811 if (win_probe_recovery && (net->window_probe)) { 4812 win_probe_recovered = 1; 4813 /*- 4814 * Find first chunk that was used with 4815 * window probe and clear the event. Put 4816 * it back into the send queue as if has 4817 * not been sent. 4818 */ 4819 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 4820 if (tp1->window_probe) { 4821 sctp_window_probe_recovery(stcb, asoc, tp1); 4822 break; 4823 } 4824 } 4825 } 4826 if (net->flight_size) { 4827 j++; 4828 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { 4829 sctp_timer_start(SCTP_TIMER_TYPE_SEND, 4830 stcb->sctp_ep, stcb, net); 4831 } 4832 if (net->window_probe) { 4833 net->window_probe = 0; 4834 } 4835 } else { 4836 if (net->window_probe) { 4837 /* 4838 * In window probes we must assure a timer 4839 * is still running there 4840 */ 4841 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { 4842 sctp_timer_start(SCTP_TIMER_TYPE_SEND, 4843 stcb->sctp_ep, stcb, net); 4844 4845 } 4846 } else if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { 4847 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 4848 stcb, net, 4849 SCTP_FROM_SCTP_INDATA + SCTP_LOC_22); 4850 } 4851 } 4852 } 4853 if ((j == 0) && 4854 (!TAILQ_EMPTY(&asoc->sent_queue)) && 4855 (asoc->sent_queue_retran_cnt == 0) && 4856 (win_probe_recovered == 0) && 4857 (done_once == 0)) { 4858 /* 4859 * huh, this should not happen unless all packets are 4860 * PR-SCTP and marked to skip of course. 4861 */ 4862 if (sctp_fs_audit(asoc)) { 4863 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4864 net->flight_size = 0; 4865 } 4866 asoc->total_flight = 0; 4867 asoc->total_flight_count = 0; 4868 asoc->sent_queue_retran_cnt = 0; 4869 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 4870 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 4871 sctp_flight_size_increase(tp1); 4872 sctp_total_flight_increase(stcb, tp1); 4873 } else if (tp1->sent == SCTP_DATAGRAM_RESEND) { 4874 sctp_ucount_incr(asoc->sent_queue_retran_cnt); 4875 } 4876 } 4877 } 4878 done_once = 1; 4879 goto again; 4880 } 4881 /*********************************************/ 4882 /* Here we perform PR-SCTP procedures */ 4883 /* (section 4.2) */ 4884 /*********************************************/ 4885 /* C1. update advancedPeerAckPoint */ 4886 if (SCTP_TSN_GT(cum_ack, asoc->advanced_peer_ack_point)) { 4887 asoc->advanced_peer_ack_point = cum_ack; 4888 } 4889 /* C2. try to further move advancedPeerAckPoint ahead */ 4890 if ((asoc->prsctp_supported) && (asoc->pr_sctp_cnt > 0)) { 4891 struct sctp_tmit_chunk *lchk; 4892 uint32_t old_adv_peer_ack_point; 4893 4894 old_adv_peer_ack_point = asoc->advanced_peer_ack_point; 4895 lchk = sctp_try_advance_peer_ack_point(stcb, asoc); 4896 /* C3. See if we need to send a Fwd-TSN */ 4897 if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, cum_ack)) { 4898 /* 4899 * ISSUE with ECN, see FWD-TSN processing. 4900 */ 4901 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) { 4902 sctp_misc_ints(SCTP_FWD_TSN_CHECK, 4903 0xee, cum_ack, asoc->advanced_peer_ack_point, 4904 old_adv_peer_ack_point); 4905 } 4906 if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, old_adv_peer_ack_point)) { 4907 send_forward_tsn(stcb, asoc); 4908 } else if (lchk) { 4909 /* try to FR fwd-tsn's that get lost too */ 4910 if (lchk->rec.data.fwd_tsn_cnt >= 3) { 4911 send_forward_tsn(stcb, asoc); 4912 } 4913 } 4914 } 4915 if (lchk) { 4916 /* Assure a timer is up */ 4917 sctp_timer_start(SCTP_TIMER_TYPE_SEND, 4918 stcb->sctp_ep, stcb, lchk->whoTo); 4919 } 4920 } 4921 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_RWND_LOGGING_ENABLE) { 4922 sctp_misc_ints(SCTP_SACK_RWND_UPDATE, 4923 a_rwnd, 4924 stcb->asoc.peers_rwnd, 4925 stcb->asoc.total_flight, 4926 stcb->asoc.total_output_queue_size); 4927 } 4928 } 4929 4930 void 4931 sctp_update_acked(struct sctp_tcb *stcb, struct sctp_shutdown_chunk *cp, int *abort_flag) 4932 { 4933 /* Copy cum-ack */ 4934 uint32_t cum_ack, a_rwnd; 4935 4936 cum_ack = ntohl(cp->cumulative_tsn_ack); 4937 /* Arrange so a_rwnd does NOT change */ 4938 a_rwnd = stcb->asoc.peers_rwnd + stcb->asoc.total_flight; 4939 4940 /* Now call the express sack handling */ 4941 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, abort_flag, 0); 4942 } 4943 4944 static void 4945 sctp_kick_prsctp_reorder_queue(struct sctp_tcb *stcb, 4946 struct sctp_stream_in *strmin) 4947 { 4948 struct sctp_queued_to_read *ctl, *nctl; 4949 struct sctp_association *asoc; 4950 uint16_t tt; 4951 4952 asoc = &stcb->asoc; 4953 tt = strmin->last_sequence_delivered; 4954 /* 4955 * First deliver anything prior to and including the stream no that 4956 * came in 4957 */ 4958 TAILQ_FOREACH_SAFE(ctl, &strmin->inqueue, next, nctl) { 4959 if (SCTP_SSN_GE(tt, ctl->sinfo_ssn)) { 4960 /* this is deliverable now */ 4961 TAILQ_REMOVE(&strmin->inqueue, ctl, next); 4962 /* subtract pending on streams */ 4963 asoc->size_on_all_streams -= ctl->length; 4964 sctp_ucount_decr(asoc->cnt_on_all_streams); 4965 /* deliver it to at least the delivery-q */ 4966 if (stcb->sctp_socket) { 4967 sctp_mark_non_revokable(asoc, ctl->sinfo_tsn); 4968 sctp_add_to_readq(stcb->sctp_ep, stcb, 4969 ctl, 4970 &stcb->sctp_socket->so_rcv, 1, SCTP_READ_LOCK_HELD, SCTP_SO_NOT_LOCKED); 4971 } 4972 } else { 4973 /* no more delivery now. */ 4974 break; 4975 } 4976 } 4977 /* 4978 * now we must deliver things in queue the normal way if any are 4979 * now ready. 4980 */ 4981 tt = strmin->last_sequence_delivered + 1; 4982 TAILQ_FOREACH_SAFE(ctl, &strmin->inqueue, next, nctl) { 4983 if (tt == ctl->sinfo_ssn) { 4984 /* this is deliverable now */ 4985 TAILQ_REMOVE(&strmin->inqueue, ctl, next); 4986 /* subtract pending on streams */ 4987 asoc->size_on_all_streams -= ctl->length; 4988 sctp_ucount_decr(asoc->cnt_on_all_streams); 4989 /* deliver it to at least the delivery-q */ 4990 strmin->last_sequence_delivered = ctl->sinfo_ssn; 4991 if (stcb->sctp_socket) { 4992 sctp_mark_non_revokable(asoc, ctl->sinfo_tsn); 4993 sctp_add_to_readq(stcb->sctp_ep, stcb, 4994 ctl, 4995 &stcb->sctp_socket->so_rcv, 1, SCTP_READ_LOCK_HELD, SCTP_SO_NOT_LOCKED); 4996 4997 } 4998 tt = strmin->last_sequence_delivered + 1; 4999 } else { 5000 break; 5001 } 5002 } 5003 } 5004 5005 static void 5006 sctp_flush_reassm_for_str_seq(struct sctp_tcb *stcb, 5007 struct sctp_association *asoc, 5008 uint16_t stream, uint16_t seq) 5009 { 5010 struct sctp_tmit_chunk *chk, *nchk; 5011 5012 /* For each one on here see if we need to toss it */ 5013 /* 5014 * For now large messages held on the reasmqueue that are complete 5015 * will be tossed too. We could in theory do more work to spin 5016 * through and stop after dumping one msg aka seeing the start of a 5017 * new msg at the head, and call the delivery function... to see if 5018 * it can be delivered... But for now we just dump everything on the 5019 * queue. 5020 */ 5021 TAILQ_FOREACH_SAFE(chk, &asoc->reasmqueue, sctp_next, nchk) { 5022 /* 5023 * Do not toss it if on a different stream or marked for 5024 * unordered delivery in which case the stream sequence 5025 * number has no meaning. 5026 */ 5027 if ((chk->rec.data.stream_number != stream) || 5028 ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == SCTP_DATA_UNORDERED)) { 5029 continue; 5030 } 5031 if (chk->rec.data.stream_seq == seq) { 5032 /* It needs to be tossed */ 5033 TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next); 5034 if (SCTP_TSN_GT(chk->rec.data.TSN_seq, asoc->tsn_last_delivered)) { 5035 asoc->tsn_last_delivered = chk->rec.data.TSN_seq; 5036 asoc->str_of_pdapi = chk->rec.data.stream_number; 5037 asoc->ssn_of_pdapi = chk->rec.data.stream_seq; 5038 asoc->fragment_flags = chk->rec.data.rcv_flags; 5039 } 5040 asoc->size_on_reasm_queue -= chk->send_size; 5041 sctp_ucount_decr(asoc->cnt_on_reasm_queue); 5042 5043 /* Clear up any stream problem */ 5044 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) != SCTP_DATA_UNORDERED && 5045 SCTP_SSN_GT(chk->rec.data.stream_seq, asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered)) { 5046 /* 5047 * We must dump forward this streams 5048 * sequence number if the chunk is not 5049 * unordered that is being skipped. There is 5050 * a chance that if the peer does not 5051 * include the last fragment in its FWD-TSN 5052 * we WILL have a problem here since you 5053 * would have a partial chunk in queue that 5054 * may not be deliverable. Also if a Partial 5055 * delivery API as started the user may get 5056 * a partial chunk. The next read returning 5057 * a new chunk... really ugly but I see no 5058 * way around it! Maybe a notify?? 5059 */ 5060 asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered = chk->rec.data.stream_seq; 5061 } 5062 if (chk->data) { 5063 sctp_m_freem(chk->data); 5064 chk->data = NULL; 5065 } 5066 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 5067 } else if (SCTP_SSN_GT(chk->rec.data.stream_seq, seq)) { 5068 /* 5069 * If the stream_seq is > than the purging one, we 5070 * are done 5071 */ 5072 break; 5073 } 5074 } 5075 } 5076 5077 5078 void 5079 sctp_handle_forward_tsn(struct sctp_tcb *stcb, 5080 struct sctp_forward_tsn_chunk *fwd, 5081 int *abort_flag, struct mbuf *m, int offset) 5082 { 5083 /* The pr-sctp fwd tsn */ 5084 /* 5085 * here we will perform all the data receiver side steps for 5086 * processing FwdTSN, as required in by pr-sctp draft: 5087 * 5088 * Assume we get FwdTSN(x): 5089 * 5090 * 1) update local cumTSN to x 2) try to further advance cumTSN to x + 5091 * others we have 3) examine and update re-ordering queue on 5092 * pr-in-streams 4) clean up re-assembly queue 5) Send a sack to 5093 * report where we are. 5094 */ 5095 struct sctp_association *asoc; 5096 uint32_t new_cum_tsn, gap; 5097 unsigned int i, fwd_sz, m_size; 5098 uint32_t str_seq; 5099 struct sctp_stream_in *strm; 5100 struct sctp_tmit_chunk *chk, *nchk; 5101 struct sctp_queued_to_read *ctl, *sv; 5102 5103 asoc = &stcb->asoc; 5104 if ((fwd_sz = ntohs(fwd->ch.chunk_length)) < sizeof(struct sctp_forward_tsn_chunk)) { 5105 SCTPDBG(SCTP_DEBUG_INDATA1, 5106 "Bad size too small/big fwd-tsn\n"); 5107 return; 5108 } 5109 m_size = (stcb->asoc.mapping_array_size << 3); 5110 /*************************************************************/ 5111 /* 1. Here we update local cumTSN and shift the bitmap array */ 5112 /*************************************************************/ 5113 new_cum_tsn = ntohl(fwd->new_cumulative_tsn); 5114 5115 if (SCTP_TSN_GE(asoc->cumulative_tsn, new_cum_tsn)) { 5116 /* Already got there ... */ 5117 return; 5118 } 5119 /* 5120 * now we know the new TSN is more advanced, let's find the actual 5121 * gap 5122 */ 5123 SCTP_CALC_TSN_TO_GAP(gap, new_cum_tsn, asoc->mapping_array_base_tsn); 5124 asoc->cumulative_tsn = new_cum_tsn; 5125 if (gap >= m_size) { 5126 if ((long)gap > sctp_sbspace(&stcb->asoc, &stcb->sctp_socket->so_rcv)) { 5127 struct mbuf *op_err; 5128 char msg[SCTP_DIAG_INFO_LEN]; 5129 5130 /* 5131 * out of range (of single byte chunks in the rwnd I 5132 * give out). This must be an attacker. 5133 */ 5134 *abort_flag = 1; 5135 snprintf(msg, sizeof(msg), 5136 "New cum ack %8.8x too high, highest TSN %8.8x", 5137 new_cum_tsn, asoc->highest_tsn_inside_map); 5138 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 5139 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_33; 5140 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 5141 return; 5142 } 5143 SCTP_STAT_INCR(sctps_fwdtsn_map_over); 5144 5145 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 5146 asoc->mapping_array_base_tsn = new_cum_tsn + 1; 5147 asoc->highest_tsn_inside_map = new_cum_tsn; 5148 5149 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 5150 asoc->highest_tsn_inside_nr_map = new_cum_tsn; 5151 5152 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 5153 sctp_log_map(0, 3, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 5154 } 5155 } else { 5156 SCTP_TCB_LOCK_ASSERT(stcb); 5157 for (i = 0; i <= gap; i++) { 5158 if (!SCTP_IS_TSN_PRESENT(asoc->mapping_array, i) && 5159 !SCTP_IS_TSN_PRESENT(asoc->nr_mapping_array, i)) { 5160 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, i); 5161 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn + i, asoc->highest_tsn_inside_nr_map)) { 5162 asoc->highest_tsn_inside_nr_map = asoc->mapping_array_base_tsn + i; 5163 } 5164 } 5165 } 5166 } 5167 /*************************************************************/ 5168 /* 2. Clear up re-assembly queue */ 5169 /*************************************************************/ 5170 /* 5171 * First service it if pd-api is up, just in case we can progress it 5172 * forward 5173 */ 5174 if (asoc->fragmented_delivery_inprogress) { 5175 sctp_service_reassembly(stcb, asoc); 5176 } 5177 /* For each one on here see if we need to toss it */ 5178 /* 5179 * For now large messages held on the reasmqueue that are complete 5180 * will be tossed too. We could in theory do more work to spin 5181 * through and stop after dumping one msg aka seeing the start of a 5182 * new msg at the head, and call the delivery function... to see if 5183 * it can be delivered... But for now we just dump everything on the 5184 * queue. 5185 */ 5186 TAILQ_FOREACH_SAFE(chk, &asoc->reasmqueue, sctp_next, nchk) { 5187 if (SCTP_TSN_GE(new_cum_tsn, chk->rec.data.TSN_seq)) { 5188 /* It needs to be tossed */ 5189 TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next); 5190 if (SCTP_TSN_GT(chk->rec.data.TSN_seq, asoc->tsn_last_delivered)) { 5191 asoc->tsn_last_delivered = chk->rec.data.TSN_seq; 5192 asoc->str_of_pdapi = chk->rec.data.stream_number; 5193 asoc->ssn_of_pdapi = chk->rec.data.stream_seq; 5194 asoc->fragment_flags = chk->rec.data.rcv_flags; 5195 } 5196 asoc->size_on_reasm_queue -= chk->send_size; 5197 sctp_ucount_decr(asoc->cnt_on_reasm_queue); 5198 5199 /* Clear up any stream problem */ 5200 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) != SCTP_DATA_UNORDERED && 5201 SCTP_SSN_GT(chk->rec.data.stream_seq, asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered)) { 5202 /* 5203 * We must dump forward this streams 5204 * sequence number if the chunk is not 5205 * unordered that is being skipped. There is 5206 * a chance that if the peer does not 5207 * include the last fragment in its FWD-TSN 5208 * we WILL have a problem here since you 5209 * would have a partial chunk in queue that 5210 * may not be deliverable. Also if a Partial 5211 * delivery API as started the user may get 5212 * a partial chunk. The next read returning 5213 * a new chunk... really ugly but I see no 5214 * way around it! Maybe a notify?? 5215 */ 5216 asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered = chk->rec.data.stream_seq; 5217 } 5218 if (chk->data) { 5219 sctp_m_freem(chk->data); 5220 chk->data = NULL; 5221 } 5222 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 5223 } else { 5224 /* 5225 * Ok we have gone beyond the end of the fwd-tsn's 5226 * mark. 5227 */ 5228 break; 5229 } 5230 } 5231 /*******************************************************/ 5232 /* 3. Update the PR-stream re-ordering queues and fix */ 5233 /* delivery issues as needed. */ 5234 /*******************************************************/ 5235 fwd_sz -= sizeof(*fwd); 5236 if (m && fwd_sz) { 5237 /* New method. */ 5238 unsigned int num_str; 5239 struct sctp_strseq *stseq, strseqbuf; 5240 5241 offset += sizeof(*fwd); 5242 5243 SCTP_INP_READ_LOCK(stcb->sctp_ep); 5244 num_str = fwd_sz / sizeof(struct sctp_strseq); 5245 for (i = 0; i < num_str; i++) { 5246 uint16_t st; 5247 5248 stseq = (struct sctp_strseq *)sctp_m_getptr(m, offset, 5249 sizeof(struct sctp_strseq), 5250 (uint8_t *) & strseqbuf); 5251 offset += sizeof(struct sctp_strseq); 5252 if (stseq == NULL) { 5253 break; 5254 } 5255 /* Convert */ 5256 st = ntohs(stseq->stream); 5257 stseq->stream = st; 5258 st = ntohs(stseq->sequence); 5259 stseq->sequence = st; 5260 5261 /* now process */ 5262 5263 /* 5264 * Ok we now look for the stream/seq on the read 5265 * queue where its not all delivered. If we find it 5266 * we transmute the read entry into a PDI_ABORTED. 5267 */ 5268 if (stseq->stream >= asoc->streamincnt) { 5269 /* screwed up streams, stop! */ 5270 break; 5271 } 5272 if ((asoc->str_of_pdapi == stseq->stream) && 5273 (asoc->ssn_of_pdapi == stseq->sequence)) { 5274 /* 5275 * If this is the one we were partially 5276 * delivering now then we no longer are. 5277 * Note this will change with the reassembly 5278 * re-write. 5279 */ 5280 asoc->fragmented_delivery_inprogress = 0; 5281 } 5282 sctp_flush_reassm_for_str_seq(stcb, asoc, stseq->stream, stseq->sequence); 5283 TAILQ_FOREACH(ctl, &stcb->sctp_ep->read_queue, next) { 5284 if ((ctl->sinfo_stream == stseq->stream) && 5285 (ctl->sinfo_ssn == stseq->sequence)) { 5286 str_seq = (stseq->stream << 16) | stseq->sequence; 5287 ctl->end_added = 1; 5288 ctl->pdapi_aborted = 1; 5289 sv = stcb->asoc.control_pdapi; 5290 stcb->asoc.control_pdapi = ctl; 5291 sctp_ulp_notify(SCTP_NOTIFY_PARTIAL_DELVIERY_INDICATION, 5292 stcb, 5293 SCTP_PARTIAL_DELIVERY_ABORTED, 5294 (void *)&str_seq, 5295 SCTP_SO_NOT_LOCKED); 5296 stcb->asoc.control_pdapi = sv; 5297 break; 5298 } else if ((ctl->sinfo_stream == stseq->stream) && 5299 SCTP_SSN_GT(ctl->sinfo_ssn, stseq->sequence)) { 5300 /* We are past our victim SSN */ 5301 break; 5302 } 5303 } 5304 strm = &asoc->strmin[stseq->stream]; 5305 if (SCTP_SSN_GT(stseq->sequence, strm->last_sequence_delivered)) { 5306 /* Update the sequence number */ 5307 strm->last_sequence_delivered = stseq->sequence; 5308 } 5309 /* now kick the stream the new way */ 5310 /* sa_ignore NO_NULL_CHK */ 5311 sctp_kick_prsctp_reorder_queue(stcb, strm); 5312 } 5313 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 5314 } 5315 /* 5316 * Now slide thing forward. 5317 */ 5318 sctp_slide_mapping_arrays(stcb); 5319 5320 if (!TAILQ_EMPTY(&asoc->reasmqueue)) { 5321 /* now lets kick out and check for more fragmented delivery */ 5322 /* sa_ignore NO_NULL_CHK */ 5323 sctp_deliver_reasm_check(stcb, &stcb->asoc); 5324 } 5325 } 5326