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_8; 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_9; 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_10; 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_11; 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_12; 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_13; 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_14; 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_15; 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_16; 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_17; 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_18; 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_19; 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, 2163 SCTP_FROM_SCTP_INDATA + SCTP_LOC_20); 2164 } 2165 sctp_send_shutdown(stcb, 2166 ((stcb->asoc.alternate) ? stcb->asoc.alternate : stcb->asoc.primary_destination)); 2167 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 2168 } else { 2169 int is_a_gap; 2170 2171 /* is there a gap now ? */ 2172 is_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 2173 2174 /* 2175 * CMT DAC algorithm: increase number of packets received 2176 * since last ack 2177 */ 2178 stcb->asoc.cmt_dac_pkts_rcvd++; 2179 2180 if ((stcb->asoc.send_sack == 1) || /* We need to send a 2181 * SACK */ 2182 ((was_a_gap) && (is_a_gap == 0)) || /* was a gap, but no 2183 * longer is one */ 2184 (stcb->asoc.numduptsns) || /* we have dup's */ 2185 (is_a_gap) || /* is still a gap */ 2186 (stcb->asoc.delayed_ack == 0) || /* Delayed sack disabled */ 2187 (stcb->asoc.data_pkts_seen >= stcb->asoc.sack_freq) /* hit limit of pkts */ 2188 ) { 2189 2190 if ((stcb->asoc.sctp_cmt_on_off > 0) && 2191 (SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) && 2192 (stcb->asoc.send_sack == 0) && 2193 (stcb->asoc.numduptsns == 0) && 2194 (stcb->asoc.delayed_ack) && 2195 (!SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer))) { 2196 2197 /* 2198 * CMT DAC algorithm: With CMT, delay acks 2199 * even in the face of 2200 * 2201 * reordering. Therefore, if acks that do not 2202 * have to be sent because of the above 2203 * reasons, will be delayed. That is, acks 2204 * that would have been sent due to gap 2205 * reports will be delayed with DAC. Start 2206 * the delayed ack timer. 2207 */ 2208 sctp_timer_start(SCTP_TIMER_TYPE_RECV, 2209 stcb->sctp_ep, stcb, NULL); 2210 } else { 2211 /* 2212 * Ok we must build a SACK since the timer 2213 * is pending, we got our first packet OR 2214 * there are gaps or duplicates. 2215 */ 2216 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer); 2217 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 2218 } 2219 } else { 2220 if (!SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) { 2221 sctp_timer_start(SCTP_TIMER_TYPE_RECV, 2222 stcb->sctp_ep, stcb, NULL); 2223 } 2224 } 2225 } 2226 } 2227 2228 void 2229 sctp_service_queues(struct sctp_tcb *stcb, struct sctp_association *asoc) 2230 { 2231 struct sctp_tmit_chunk *chk; 2232 uint32_t tsize, pd_point; 2233 uint16_t nxt_todel; 2234 2235 if (asoc->fragmented_delivery_inprogress) { 2236 sctp_service_reassembly(stcb, asoc); 2237 } 2238 /* Can we proceed further, i.e. the PD-API is complete */ 2239 if (asoc->fragmented_delivery_inprogress) { 2240 /* no */ 2241 return; 2242 } 2243 /* 2244 * Now is there some other chunk I can deliver from the reassembly 2245 * queue. 2246 */ 2247 doit_again: 2248 chk = TAILQ_FIRST(&asoc->reasmqueue); 2249 if (chk == NULL) { 2250 asoc->size_on_reasm_queue = 0; 2251 asoc->cnt_on_reasm_queue = 0; 2252 return; 2253 } 2254 nxt_todel = asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered + 1; 2255 if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) && 2256 ((nxt_todel == chk->rec.data.stream_seq) || 2257 (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED))) { 2258 /* 2259 * Yep the first one is here. We setup to start reception, 2260 * by backing down the TSN just in case we can't deliver. 2261 */ 2262 2263 /* 2264 * Before we start though either all of the message should 2265 * be here or the socket buffer max or nothing on the 2266 * delivery queue and something can be delivered. 2267 */ 2268 if (stcb->sctp_socket) { 2269 pd_point = min(SCTP_SB_LIMIT_RCV(stcb->sctp_socket) >> SCTP_PARTIAL_DELIVERY_SHIFT, 2270 stcb->sctp_ep->partial_delivery_point); 2271 } else { 2272 pd_point = stcb->sctp_ep->partial_delivery_point; 2273 } 2274 if (sctp_is_all_msg_on_reasm(asoc, &tsize) || (tsize >= pd_point)) { 2275 asoc->fragmented_delivery_inprogress = 1; 2276 asoc->tsn_last_delivered = chk->rec.data.TSN_seq - 1; 2277 asoc->str_of_pdapi = chk->rec.data.stream_number; 2278 asoc->ssn_of_pdapi = chk->rec.data.stream_seq; 2279 asoc->pdapi_ppid = chk->rec.data.payloadtype; 2280 asoc->fragment_flags = chk->rec.data.rcv_flags; 2281 sctp_service_reassembly(stcb, asoc); 2282 if (asoc->fragmented_delivery_inprogress == 0) { 2283 goto doit_again; 2284 } 2285 } 2286 } 2287 } 2288 2289 int 2290 sctp_process_data(struct mbuf **mm, int iphlen, int *offset, int length, 2291 struct sockaddr *src, struct sockaddr *dst, 2292 struct sctphdr *sh, struct sctp_inpcb *inp, 2293 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t * high_tsn, 2294 uint8_t mflowtype, uint32_t mflowid, 2295 uint32_t vrf_id, uint16_t port) 2296 { 2297 struct sctp_data_chunk *ch, chunk_buf; 2298 struct sctp_association *asoc; 2299 int num_chunks = 0; /* number of control chunks processed */ 2300 int stop_proc = 0; 2301 int chk_length, break_flag, last_chunk; 2302 int abort_flag = 0, was_a_gap; 2303 struct mbuf *m; 2304 uint32_t highest_tsn; 2305 2306 /* set the rwnd */ 2307 sctp_set_rwnd(stcb, &stcb->asoc); 2308 2309 m = *mm; 2310 SCTP_TCB_LOCK_ASSERT(stcb); 2311 asoc = &stcb->asoc; 2312 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->highest_tsn_inside_map)) { 2313 highest_tsn = asoc->highest_tsn_inside_nr_map; 2314 } else { 2315 highest_tsn = asoc->highest_tsn_inside_map; 2316 } 2317 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 2318 /* 2319 * setup where we got the last DATA packet from for any SACK that 2320 * may need to go out. Don't bump the net. This is done ONLY when a 2321 * chunk is assigned. 2322 */ 2323 asoc->last_data_chunk_from = net; 2324 2325 /*- 2326 * Now before we proceed we must figure out if this is a wasted 2327 * cluster... i.e. it is a small packet sent in and yet the driver 2328 * underneath allocated a full cluster for it. If so we must copy it 2329 * to a smaller mbuf and free up the cluster mbuf. This will help 2330 * with cluster starvation. Note for __Panda__ we don't do this 2331 * since it has clusters all the way down to 64 bytes. 2332 */ 2333 if (SCTP_BUF_LEN(m) < (long)MLEN && SCTP_BUF_NEXT(m) == NULL) { 2334 /* we only handle mbufs that are singletons.. not chains */ 2335 m = sctp_get_mbuf_for_msg(SCTP_BUF_LEN(m), 0, M_NOWAIT, 1, MT_DATA); 2336 if (m) { 2337 /* ok lets see if we can copy the data up */ 2338 caddr_t *from, *to; 2339 2340 /* get the pointers and copy */ 2341 to = mtod(m, caddr_t *); 2342 from = mtod((*mm), caddr_t *); 2343 memcpy(to, from, SCTP_BUF_LEN((*mm))); 2344 /* copy the length and free up the old */ 2345 SCTP_BUF_LEN(m) = SCTP_BUF_LEN((*mm)); 2346 sctp_m_freem(*mm); 2347 /* sucess, back copy */ 2348 *mm = m; 2349 } else { 2350 /* We are in trouble in the mbuf world .. yikes */ 2351 m = *mm; 2352 } 2353 } 2354 /* get pointer to the first chunk header */ 2355 ch = (struct sctp_data_chunk *)sctp_m_getptr(m, *offset, 2356 sizeof(struct sctp_data_chunk), (uint8_t *) & chunk_buf); 2357 if (ch == NULL) { 2358 return (1); 2359 } 2360 /* 2361 * process all DATA chunks... 2362 */ 2363 *high_tsn = asoc->cumulative_tsn; 2364 break_flag = 0; 2365 asoc->data_pkts_seen++; 2366 while (stop_proc == 0) { 2367 /* validate chunk length */ 2368 chk_length = ntohs(ch->ch.chunk_length); 2369 if (length - *offset < chk_length) { 2370 /* all done, mutulated chunk */ 2371 stop_proc = 1; 2372 continue; 2373 } 2374 if (ch->ch.chunk_type == SCTP_DATA) { 2375 if ((size_t)chk_length < sizeof(struct sctp_data_chunk)) { 2376 /* 2377 * Need to send an abort since we had a 2378 * invalid data chunk. 2379 */ 2380 struct mbuf *op_err; 2381 char msg[SCTP_DIAG_INFO_LEN]; 2382 2383 snprintf(msg, sizeof(msg), "DATA chunk of length %d", 2384 chk_length); 2385 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 2386 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_21; 2387 sctp_abort_association(inp, stcb, m, iphlen, 2388 src, dst, sh, op_err, 2389 mflowtype, mflowid, 2390 vrf_id, port); 2391 return (2); 2392 } 2393 if ((size_t)chk_length == sizeof(struct sctp_data_chunk)) { 2394 /* 2395 * Need to send an abort since we had an 2396 * empty data chunk. 2397 */ 2398 struct mbuf *op_err; 2399 2400 op_err = sctp_generate_no_user_data_cause(ch->dp.tsn); 2401 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_22; 2402 sctp_abort_association(inp, stcb, m, iphlen, 2403 src, dst, sh, op_err, 2404 mflowtype, mflowid, 2405 vrf_id, port); 2406 return (2); 2407 } 2408 #ifdef SCTP_AUDITING_ENABLED 2409 sctp_audit_log(0xB1, 0); 2410 #endif 2411 if (SCTP_SIZE32(chk_length) == (length - *offset)) { 2412 last_chunk = 1; 2413 } else { 2414 last_chunk = 0; 2415 } 2416 if (sctp_process_a_data_chunk(stcb, asoc, mm, *offset, ch, 2417 chk_length, net, high_tsn, &abort_flag, &break_flag, 2418 last_chunk)) { 2419 num_chunks++; 2420 } 2421 if (abort_flag) 2422 return (2); 2423 2424 if (break_flag) { 2425 /* 2426 * Set because of out of rwnd space and no 2427 * drop rep space left. 2428 */ 2429 stop_proc = 1; 2430 continue; 2431 } 2432 } else { 2433 /* not a data chunk in the data region */ 2434 switch (ch->ch.chunk_type) { 2435 case SCTP_INITIATION: 2436 case SCTP_INITIATION_ACK: 2437 case SCTP_SELECTIVE_ACK: 2438 case SCTP_NR_SELECTIVE_ACK: 2439 case SCTP_HEARTBEAT_REQUEST: 2440 case SCTP_HEARTBEAT_ACK: 2441 case SCTP_ABORT_ASSOCIATION: 2442 case SCTP_SHUTDOWN: 2443 case SCTP_SHUTDOWN_ACK: 2444 case SCTP_OPERATION_ERROR: 2445 case SCTP_COOKIE_ECHO: 2446 case SCTP_COOKIE_ACK: 2447 case SCTP_ECN_ECHO: 2448 case SCTP_ECN_CWR: 2449 case SCTP_SHUTDOWN_COMPLETE: 2450 case SCTP_AUTHENTICATION: 2451 case SCTP_ASCONF_ACK: 2452 case SCTP_PACKET_DROPPED: 2453 case SCTP_STREAM_RESET: 2454 case SCTP_FORWARD_CUM_TSN: 2455 case SCTP_ASCONF: 2456 /* 2457 * Now, what do we do with KNOWN chunks that 2458 * are NOT in the right place? 2459 * 2460 * For now, I do nothing but ignore them. We 2461 * may later want to add sysctl stuff to 2462 * switch out and do either an ABORT() or 2463 * possibly process them. 2464 */ 2465 if (SCTP_BASE_SYSCTL(sctp_strict_data_order)) { 2466 struct mbuf *op_err; 2467 2468 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, ""); 2469 sctp_abort_association(inp, stcb, 2470 m, iphlen, 2471 src, dst, 2472 sh, op_err, 2473 mflowtype, mflowid, 2474 vrf_id, port); 2475 return (2); 2476 } 2477 break; 2478 default: 2479 /* unknown chunk type, use bit rules */ 2480 if (ch->ch.chunk_type & 0x40) { 2481 /* Add a error report to the queue */ 2482 struct mbuf *merr; 2483 struct sctp_paramhdr *phd; 2484 2485 merr = sctp_get_mbuf_for_msg(sizeof(*phd), 0, M_NOWAIT, 1, MT_DATA); 2486 if (merr) { 2487 phd = mtod(merr, struct sctp_paramhdr *); 2488 /* 2489 * We cheat and use param 2490 * type since we did not 2491 * bother to define a error 2492 * cause struct. They are 2493 * the same basic format 2494 * with different names. 2495 */ 2496 phd->param_type = 2497 htons(SCTP_CAUSE_UNRECOG_CHUNK); 2498 phd->param_length = 2499 htons(chk_length + sizeof(*phd)); 2500 SCTP_BUF_LEN(merr) = sizeof(*phd); 2501 SCTP_BUF_NEXT(merr) = SCTP_M_COPYM(m, *offset, chk_length, M_NOWAIT); 2502 if (SCTP_BUF_NEXT(merr)) { 2503 if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(merr), SCTP_SIZE32(chk_length) - chk_length, NULL) == NULL) { 2504 sctp_m_freem(merr); 2505 } else { 2506 sctp_queue_op_err(stcb, merr); 2507 } 2508 } else { 2509 sctp_m_freem(merr); 2510 } 2511 } 2512 } 2513 if ((ch->ch.chunk_type & 0x80) == 0) { 2514 /* discard the rest of this packet */ 2515 stop_proc = 1; 2516 } /* else skip this bad chunk and 2517 * continue... */ 2518 break; 2519 } /* switch of chunk type */ 2520 } 2521 *offset += SCTP_SIZE32(chk_length); 2522 if ((*offset >= length) || stop_proc) { 2523 /* no more data left in the mbuf chain */ 2524 stop_proc = 1; 2525 continue; 2526 } 2527 ch = (struct sctp_data_chunk *)sctp_m_getptr(m, *offset, 2528 sizeof(struct sctp_data_chunk), (uint8_t *) & chunk_buf); 2529 if (ch == NULL) { 2530 *offset = length; 2531 stop_proc = 1; 2532 continue; 2533 } 2534 } 2535 if (break_flag) { 2536 /* 2537 * we need to report rwnd overrun drops. 2538 */ 2539 sctp_send_packet_dropped(stcb, net, *mm, length, iphlen, 0); 2540 } 2541 if (num_chunks) { 2542 /* 2543 * Did we get data, if so update the time for auto-close and 2544 * give peer credit for being alive. 2545 */ 2546 SCTP_STAT_INCR(sctps_recvpktwithdata); 2547 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 2548 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 2549 stcb->asoc.overall_error_count, 2550 0, 2551 SCTP_FROM_SCTP_INDATA, 2552 __LINE__); 2553 } 2554 stcb->asoc.overall_error_count = 0; 2555 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_last_rcvd); 2556 } 2557 /* now service all of the reassm queue if needed */ 2558 if (!(TAILQ_EMPTY(&asoc->reasmqueue))) 2559 sctp_service_queues(stcb, asoc); 2560 2561 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 2562 /* Assure that we ack right away */ 2563 stcb->asoc.send_sack = 1; 2564 } 2565 /* Start a sack timer or QUEUE a SACK for sending */ 2566 sctp_sack_check(stcb, was_a_gap); 2567 return (0); 2568 } 2569 2570 static int 2571 sctp_process_segment_range(struct sctp_tcb *stcb, struct sctp_tmit_chunk **p_tp1, uint32_t last_tsn, 2572 uint16_t frag_strt, uint16_t frag_end, int nr_sacking, 2573 int *num_frs, 2574 uint32_t * biggest_newly_acked_tsn, 2575 uint32_t * this_sack_lowest_newack, 2576 int *rto_ok) 2577 { 2578 struct sctp_tmit_chunk *tp1; 2579 unsigned int theTSN; 2580 int j, wake_him = 0, circled = 0; 2581 2582 /* Recover the tp1 we last saw */ 2583 tp1 = *p_tp1; 2584 if (tp1 == NULL) { 2585 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue); 2586 } 2587 for (j = frag_strt; j <= frag_end; j++) { 2588 theTSN = j + last_tsn; 2589 while (tp1) { 2590 if (tp1->rec.data.doing_fast_retransmit) 2591 (*num_frs) += 1; 2592 2593 /*- 2594 * CMT: CUCv2 algorithm. For each TSN being 2595 * processed from the sent queue, track the 2596 * next expected pseudo-cumack, or 2597 * rtx_pseudo_cumack, if required. Separate 2598 * cumack trackers for first transmissions, 2599 * and retransmissions. 2600 */ 2601 if ((tp1->sent < SCTP_DATAGRAM_RESEND) && 2602 (tp1->whoTo->find_pseudo_cumack == 1) && 2603 (tp1->snd_count == 1)) { 2604 tp1->whoTo->pseudo_cumack = tp1->rec.data.TSN_seq; 2605 tp1->whoTo->find_pseudo_cumack = 0; 2606 } 2607 if ((tp1->sent < SCTP_DATAGRAM_RESEND) && 2608 (tp1->whoTo->find_rtx_pseudo_cumack == 1) && 2609 (tp1->snd_count > 1)) { 2610 tp1->whoTo->rtx_pseudo_cumack = tp1->rec.data.TSN_seq; 2611 tp1->whoTo->find_rtx_pseudo_cumack = 0; 2612 } 2613 if (tp1->rec.data.TSN_seq == theTSN) { 2614 if (tp1->sent != SCTP_DATAGRAM_UNSENT) { 2615 /*- 2616 * must be held until 2617 * cum-ack passes 2618 */ 2619 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 2620 /*- 2621 * If it is less than RESEND, it is 2622 * now no-longer in flight. 2623 * Higher values may already be set 2624 * via previous Gap Ack Blocks... 2625 * i.e. ACKED or RESEND. 2626 */ 2627 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, 2628 *biggest_newly_acked_tsn)) { 2629 *biggest_newly_acked_tsn = tp1->rec.data.TSN_seq; 2630 } 2631 /*- 2632 * CMT: SFR algo (and HTNA) - set 2633 * saw_newack to 1 for dest being 2634 * newly acked. update 2635 * this_sack_highest_newack if 2636 * appropriate. 2637 */ 2638 if (tp1->rec.data.chunk_was_revoked == 0) 2639 tp1->whoTo->saw_newack = 1; 2640 2641 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, 2642 tp1->whoTo->this_sack_highest_newack)) { 2643 tp1->whoTo->this_sack_highest_newack = 2644 tp1->rec.data.TSN_seq; 2645 } 2646 /*- 2647 * CMT DAC algo: also update 2648 * this_sack_lowest_newack 2649 */ 2650 if (*this_sack_lowest_newack == 0) { 2651 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 2652 sctp_log_sack(*this_sack_lowest_newack, 2653 last_tsn, 2654 tp1->rec.data.TSN_seq, 2655 0, 2656 0, 2657 SCTP_LOG_TSN_ACKED); 2658 } 2659 *this_sack_lowest_newack = tp1->rec.data.TSN_seq; 2660 } 2661 /*- 2662 * CMT: CUCv2 algorithm. If (rtx-)pseudo-cumack for corresp 2663 * dest is being acked, then we have a new (rtx-)pseudo-cumack. Set 2664 * new_(rtx_)pseudo_cumack to TRUE so that the cwnd for this dest can be 2665 * updated. Also trigger search for the next expected (rtx-)pseudo-cumack. 2666 * Separate pseudo_cumack trackers for first transmissions and 2667 * retransmissions. 2668 */ 2669 if (tp1->rec.data.TSN_seq == tp1->whoTo->pseudo_cumack) { 2670 if (tp1->rec.data.chunk_was_revoked == 0) { 2671 tp1->whoTo->new_pseudo_cumack = 1; 2672 } 2673 tp1->whoTo->find_pseudo_cumack = 1; 2674 } 2675 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 2676 sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK); 2677 } 2678 if (tp1->rec.data.TSN_seq == tp1->whoTo->rtx_pseudo_cumack) { 2679 if (tp1->rec.data.chunk_was_revoked == 0) { 2680 tp1->whoTo->new_pseudo_cumack = 1; 2681 } 2682 tp1->whoTo->find_rtx_pseudo_cumack = 1; 2683 } 2684 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 2685 sctp_log_sack(*biggest_newly_acked_tsn, 2686 last_tsn, 2687 tp1->rec.data.TSN_seq, 2688 frag_strt, 2689 frag_end, 2690 SCTP_LOG_TSN_ACKED); 2691 } 2692 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 2693 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_GAP, 2694 tp1->whoTo->flight_size, 2695 tp1->book_size, 2696 (uintptr_t) tp1->whoTo, 2697 tp1->rec.data.TSN_seq); 2698 } 2699 sctp_flight_size_decrease(tp1); 2700 if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) { 2701 (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo, 2702 tp1); 2703 } 2704 sctp_total_flight_decrease(stcb, tp1); 2705 2706 tp1->whoTo->net_ack += tp1->send_size; 2707 if (tp1->snd_count < 2) { 2708 /*- 2709 * True non-retransmited chunk 2710 */ 2711 tp1->whoTo->net_ack2 += tp1->send_size; 2712 2713 /*- 2714 * update RTO too ? 2715 */ 2716 if (tp1->do_rtt) { 2717 if (*rto_ok) { 2718 tp1->whoTo->RTO = 2719 sctp_calculate_rto(stcb, 2720 &stcb->asoc, 2721 tp1->whoTo, 2722 &tp1->sent_rcv_time, 2723 sctp_align_safe_nocopy, 2724 SCTP_RTT_FROM_DATA); 2725 *rto_ok = 0; 2726 } 2727 if (tp1->whoTo->rto_needed == 0) { 2728 tp1->whoTo->rto_needed = 1; 2729 } 2730 tp1->do_rtt = 0; 2731 } 2732 } 2733 } 2734 if (tp1->sent <= SCTP_DATAGRAM_RESEND) { 2735 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, 2736 stcb->asoc.this_sack_highest_gap)) { 2737 stcb->asoc.this_sack_highest_gap = 2738 tp1->rec.data.TSN_seq; 2739 } 2740 if (tp1->sent == SCTP_DATAGRAM_RESEND) { 2741 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt); 2742 #ifdef SCTP_AUDITING_ENABLED 2743 sctp_audit_log(0xB2, 2744 (stcb->asoc.sent_queue_retran_cnt & 0x000000ff)); 2745 #endif 2746 } 2747 } 2748 /*- 2749 * All chunks NOT UNSENT fall through here and are marked 2750 * (leave PR-SCTP ones that are to skip alone though) 2751 */ 2752 if ((tp1->sent != SCTP_FORWARD_TSN_SKIP) && 2753 (tp1->sent != SCTP_DATAGRAM_NR_ACKED)) { 2754 tp1->sent = SCTP_DATAGRAM_MARKED; 2755 } 2756 if (tp1->rec.data.chunk_was_revoked) { 2757 /* deflate the cwnd */ 2758 tp1->whoTo->cwnd -= tp1->book_size; 2759 tp1->rec.data.chunk_was_revoked = 0; 2760 } 2761 /* NR Sack code here */ 2762 if (nr_sacking && 2763 (tp1->sent != SCTP_DATAGRAM_NR_ACKED)) { 2764 if (stcb->asoc.strmout[tp1->rec.data.stream_number].chunks_on_queues > 0) { 2765 stcb->asoc.strmout[tp1->rec.data.stream_number].chunks_on_queues--; 2766 #ifdef INVARIANTS 2767 } else { 2768 panic("No chunks on the queues for sid %u.", tp1->rec.data.stream_number); 2769 #endif 2770 } 2771 tp1->sent = SCTP_DATAGRAM_NR_ACKED; 2772 if (tp1->data) { 2773 /* 2774 * sa_ignore 2775 * NO_NULL_CHK 2776 */ 2777 sctp_free_bufspace(stcb, &stcb->asoc, tp1, 1); 2778 sctp_m_freem(tp1->data); 2779 tp1->data = NULL; 2780 } 2781 wake_him++; 2782 } 2783 } 2784 break; 2785 } /* if (tp1->TSN_seq == theTSN) */ 2786 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, theTSN)) { 2787 break; 2788 } 2789 tp1 = TAILQ_NEXT(tp1, sctp_next); 2790 if ((tp1 == NULL) && (circled == 0)) { 2791 circled++; 2792 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue); 2793 } 2794 } /* end while (tp1) */ 2795 if (tp1 == NULL) { 2796 circled = 0; 2797 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue); 2798 } 2799 /* In case the fragments were not in order we must reset */ 2800 } /* end for (j = fragStart */ 2801 *p_tp1 = tp1; 2802 return (wake_him); /* Return value only used for nr-sack */ 2803 } 2804 2805 2806 static int 2807 sctp_handle_segments(struct mbuf *m, int *offset, struct sctp_tcb *stcb, struct sctp_association *asoc, 2808 uint32_t last_tsn, uint32_t * biggest_tsn_acked, 2809 uint32_t * biggest_newly_acked_tsn, uint32_t * this_sack_lowest_newack, 2810 int num_seg, int num_nr_seg, int *rto_ok) 2811 { 2812 struct sctp_gap_ack_block *frag, block; 2813 struct sctp_tmit_chunk *tp1; 2814 int i; 2815 int num_frs = 0; 2816 int chunk_freed; 2817 int non_revocable; 2818 uint16_t frag_strt, frag_end, prev_frag_end; 2819 2820 tp1 = TAILQ_FIRST(&asoc->sent_queue); 2821 prev_frag_end = 0; 2822 chunk_freed = 0; 2823 2824 for (i = 0; i < (num_seg + num_nr_seg); i++) { 2825 if (i == num_seg) { 2826 prev_frag_end = 0; 2827 tp1 = TAILQ_FIRST(&asoc->sent_queue); 2828 } 2829 frag = (struct sctp_gap_ack_block *)sctp_m_getptr(m, *offset, 2830 sizeof(struct sctp_gap_ack_block), (uint8_t *) & block); 2831 *offset += sizeof(block); 2832 if (frag == NULL) { 2833 return (chunk_freed); 2834 } 2835 frag_strt = ntohs(frag->start); 2836 frag_end = ntohs(frag->end); 2837 2838 if (frag_strt > frag_end) { 2839 /* This gap report is malformed, skip it. */ 2840 continue; 2841 } 2842 if (frag_strt <= prev_frag_end) { 2843 /* This gap report is not in order, so restart. */ 2844 tp1 = TAILQ_FIRST(&asoc->sent_queue); 2845 } 2846 if (SCTP_TSN_GT((last_tsn + frag_end), *biggest_tsn_acked)) { 2847 *biggest_tsn_acked = last_tsn + frag_end; 2848 } 2849 if (i < num_seg) { 2850 non_revocable = 0; 2851 } else { 2852 non_revocable = 1; 2853 } 2854 if (sctp_process_segment_range(stcb, &tp1, last_tsn, frag_strt, frag_end, 2855 non_revocable, &num_frs, biggest_newly_acked_tsn, 2856 this_sack_lowest_newack, rto_ok)) { 2857 chunk_freed = 1; 2858 } 2859 prev_frag_end = frag_end; 2860 } 2861 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 2862 if (num_frs) 2863 sctp_log_fr(*biggest_tsn_acked, 2864 *biggest_newly_acked_tsn, 2865 last_tsn, SCTP_FR_LOG_BIGGEST_TSNS); 2866 } 2867 return (chunk_freed); 2868 } 2869 2870 static void 2871 sctp_check_for_revoked(struct sctp_tcb *stcb, 2872 struct sctp_association *asoc, uint32_t cumack, 2873 uint32_t biggest_tsn_acked) 2874 { 2875 struct sctp_tmit_chunk *tp1; 2876 2877 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 2878 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, cumack)) { 2879 /* 2880 * ok this guy is either ACK or MARKED. If it is 2881 * ACKED it has been previously acked but not this 2882 * time i.e. revoked. If it is MARKED it was ACK'ed 2883 * again. 2884 */ 2885 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, biggest_tsn_acked)) { 2886 break; 2887 } 2888 if (tp1->sent == SCTP_DATAGRAM_ACKED) { 2889 /* it has been revoked */ 2890 tp1->sent = SCTP_DATAGRAM_SENT; 2891 tp1->rec.data.chunk_was_revoked = 1; 2892 /* 2893 * We must add this stuff back in to assure 2894 * timers and such get started. 2895 */ 2896 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 2897 sctp_misc_ints(SCTP_FLIGHT_LOG_UP_REVOKE, 2898 tp1->whoTo->flight_size, 2899 tp1->book_size, 2900 (uintptr_t) tp1->whoTo, 2901 tp1->rec.data.TSN_seq); 2902 } 2903 sctp_flight_size_increase(tp1); 2904 sctp_total_flight_increase(stcb, tp1); 2905 /* 2906 * We inflate the cwnd to compensate for our 2907 * artificial inflation of the flight_size. 2908 */ 2909 tp1->whoTo->cwnd += tp1->book_size; 2910 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 2911 sctp_log_sack(asoc->last_acked_seq, 2912 cumack, 2913 tp1->rec.data.TSN_seq, 2914 0, 2915 0, 2916 SCTP_LOG_TSN_REVOKED); 2917 } 2918 } else if (tp1->sent == SCTP_DATAGRAM_MARKED) { 2919 /* it has been re-acked in this SACK */ 2920 tp1->sent = SCTP_DATAGRAM_ACKED; 2921 } 2922 } 2923 if (tp1->sent == SCTP_DATAGRAM_UNSENT) 2924 break; 2925 } 2926 } 2927 2928 2929 static void 2930 sctp_strike_gap_ack_chunks(struct sctp_tcb *stcb, struct sctp_association *asoc, 2931 uint32_t biggest_tsn_acked, uint32_t biggest_tsn_newly_acked, uint32_t this_sack_lowest_newack, int accum_moved) 2932 { 2933 struct sctp_tmit_chunk *tp1; 2934 int strike_flag = 0; 2935 struct timeval now; 2936 int tot_retrans = 0; 2937 uint32_t sending_seq; 2938 struct sctp_nets *net; 2939 int num_dests_sacked = 0; 2940 2941 /* 2942 * select the sending_seq, this is either the next thing ready to be 2943 * sent but not transmitted, OR, the next seq we assign. 2944 */ 2945 tp1 = TAILQ_FIRST(&stcb->asoc.send_queue); 2946 if (tp1 == NULL) { 2947 sending_seq = asoc->sending_seq; 2948 } else { 2949 sending_seq = tp1->rec.data.TSN_seq; 2950 } 2951 2952 /* CMT DAC algo: finding out if SACK is a mixed SACK */ 2953 if ((asoc->sctp_cmt_on_off > 0) && 2954 SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) { 2955 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 2956 if (net->saw_newack) 2957 num_dests_sacked++; 2958 } 2959 } 2960 if (stcb->asoc.prsctp_supported) { 2961 (void)SCTP_GETTIME_TIMEVAL(&now); 2962 } 2963 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 2964 strike_flag = 0; 2965 if (tp1->no_fr_allowed) { 2966 /* this one had a timeout or something */ 2967 continue; 2968 } 2969 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 2970 if (tp1->sent < SCTP_DATAGRAM_RESEND) 2971 sctp_log_fr(biggest_tsn_newly_acked, 2972 tp1->rec.data.TSN_seq, 2973 tp1->sent, 2974 SCTP_FR_LOG_CHECK_STRIKE); 2975 } 2976 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, biggest_tsn_acked) || 2977 tp1->sent == SCTP_DATAGRAM_UNSENT) { 2978 /* done */ 2979 break; 2980 } 2981 if (stcb->asoc.prsctp_supported) { 2982 if ((PR_SCTP_TTL_ENABLED(tp1->flags)) && tp1->sent < SCTP_DATAGRAM_ACKED) { 2983 /* Is it expired? */ 2984 if (timevalcmp(&now, &tp1->rec.data.timetodrop, >)) { 2985 /* Yes so drop it */ 2986 if (tp1->data != NULL) { 2987 (void)sctp_release_pr_sctp_chunk(stcb, tp1, 1, 2988 SCTP_SO_NOT_LOCKED); 2989 } 2990 continue; 2991 } 2992 } 2993 } 2994 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, asoc->this_sack_highest_gap)) { 2995 /* we are beyond the tsn in the sack */ 2996 break; 2997 } 2998 if (tp1->sent >= SCTP_DATAGRAM_RESEND) { 2999 /* either a RESEND, ACKED, or MARKED */ 3000 /* skip */ 3001 if (tp1->sent == SCTP_FORWARD_TSN_SKIP) { 3002 /* Continue strikin FWD-TSN chunks */ 3003 tp1->rec.data.fwd_tsn_cnt++; 3004 } 3005 continue; 3006 } 3007 /* 3008 * CMT : SFR algo (covers part of DAC and HTNA as well) 3009 */ 3010 if (tp1->whoTo && tp1->whoTo->saw_newack == 0) { 3011 /* 3012 * No new acks were receieved for data sent to this 3013 * dest. Therefore, according to the SFR algo for 3014 * CMT, no data sent to this dest can be marked for 3015 * FR using this SACK. 3016 */ 3017 continue; 3018 } else if (tp1->whoTo && SCTP_TSN_GT(tp1->rec.data.TSN_seq, 3019 tp1->whoTo->this_sack_highest_newack)) { 3020 /* 3021 * CMT: New acks were receieved for data sent to 3022 * this dest. But no new acks were seen for data 3023 * sent after tp1. Therefore, according to the SFR 3024 * algo for CMT, tp1 cannot be marked for FR using 3025 * this SACK. This step covers part of the DAC algo 3026 * and the HTNA algo as well. 3027 */ 3028 continue; 3029 } 3030 /* 3031 * Here we check to see if we were have already done a FR 3032 * and if so we see if the biggest TSN we saw in the sack is 3033 * smaller than the recovery point. If so we don't strike 3034 * the tsn... otherwise we CAN strike the TSN. 3035 */ 3036 /* 3037 * @@@ JRI: Check for CMT if (accum_moved && 3038 * asoc->fast_retran_loss_recovery && (sctp_cmt_on_off == 3039 * 0)) { 3040 */ 3041 if (accum_moved && asoc->fast_retran_loss_recovery) { 3042 /* 3043 * Strike the TSN if in fast-recovery and cum-ack 3044 * moved. 3045 */ 3046 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3047 sctp_log_fr(biggest_tsn_newly_acked, 3048 tp1->rec.data.TSN_seq, 3049 tp1->sent, 3050 SCTP_FR_LOG_STRIKE_CHUNK); 3051 } 3052 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3053 tp1->sent++; 3054 } 3055 if ((asoc->sctp_cmt_on_off > 0) && 3056 SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) { 3057 /* 3058 * CMT DAC algorithm: If SACK flag is set to 3059 * 0, then lowest_newack test will not pass 3060 * because it would have been set to the 3061 * cumack earlier. If not already to be 3062 * rtx'd, If not a mixed sack and if tp1 is 3063 * not between two sacked TSNs, then mark by 3064 * one more. NOTE that we are marking by one 3065 * additional time since the SACK DAC flag 3066 * indicates that two packets have been 3067 * received after this missing TSN. 3068 */ 3069 if ((tp1->sent < SCTP_DATAGRAM_RESEND) && (num_dests_sacked == 1) && 3070 SCTP_TSN_GT(this_sack_lowest_newack, tp1->rec.data.TSN_seq)) { 3071 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3072 sctp_log_fr(16 + num_dests_sacked, 3073 tp1->rec.data.TSN_seq, 3074 tp1->sent, 3075 SCTP_FR_LOG_STRIKE_CHUNK); 3076 } 3077 tp1->sent++; 3078 } 3079 } 3080 } else if ((tp1->rec.data.doing_fast_retransmit) && 3081 (asoc->sctp_cmt_on_off == 0)) { 3082 /* 3083 * For those that have done a FR we must take 3084 * special consideration if we strike. I.e the 3085 * biggest_newly_acked must be higher than the 3086 * sending_seq at the time we did the FR. 3087 */ 3088 if ( 3089 #ifdef SCTP_FR_TO_ALTERNATE 3090 /* 3091 * If FR's go to new networks, then we must only do 3092 * this for singly homed asoc's. However if the FR's 3093 * go to the same network (Armando's work) then its 3094 * ok to FR multiple times. 3095 */ 3096 (asoc->numnets < 2) 3097 #else 3098 (1) 3099 #endif 3100 ) { 3101 3102 if (SCTP_TSN_GE(biggest_tsn_newly_acked, 3103 tp1->rec.data.fast_retran_tsn)) { 3104 /* 3105 * Strike the TSN, since this ack is 3106 * beyond where things were when we 3107 * did a FR. 3108 */ 3109 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3110 sctp_log_fr(biggest_tsn_newly_acked, 3111 tp1->rec.data.TSN_seq, 3112 tp1->sent, 3113 SCTP_FR_LOG_STRIKE_CHUNK); 3114 } 3115 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3116 tp1->sent++; 3117 } 3118 strike_flag = 1; 3119 if ((asoc->sctp_cmt_on_off > 0) && 3120 SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) { 3121 /* 3122 * CMT DAC algorithm: If 3123 * SACK flag is set to 0, 3124 * then lowest_newack test 3125 * will not pass because it 3126 * would have been set to 3127 * the cumack earlier. If 3128 * not already to be rtx'd, 3129 * If not a mixed sack and 3130 * if tp1 is not between two 3131 * sacked TSNs, then mark by 3132 * one more. NOTE that we 3133 * are marking by one 3134 * additional time since the 3135 * SACK DAC flag indicates 3136 * that two packets have 3137 * been received after this 3138 * missing TSN. 3139 */ 3140 if ((tp1->sent < SCTP_DATAGRAM_RESEND) && 3141 (num_dests_sacked == 1) && 3142 SCTP_TSN_GT(this_sack_lowest_newack, 3143 tp1->rec.data.TSN_seq)) { 3144 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3145 sctp_log_fr(32 + num_dests_sacked, 3146 tp1->rec.data.TSN_seq, 3147 tp1->sent, 3148 SCTP_FR_LOG_STRIKE_CHUNK); 3149 } 3150 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3151 tp1->sent++; 3152 } 3153 } 3154 } 3155 } 3156 } 3157 /* 3158 * JRI: TODO: remove code for HTNA algo. CMT's SFR 3159 * algo covers HTNA. 3160 */ 3161 } else if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, 3162 biggest_tsn_newly_acked)) { 3163 /* 3164 * We don't strike these: This is the HTNA 3165 * algorithm i.e. we don't strike If our TSN is 3166 * larger than the Highest TSN Newly Acked. 3167 */ 3168 ; 3169 } else { 3170 /* Strike the TSN */ 3171 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3172 sctp_log_fr(biggest_tsn_newly_acked, 3173 tp1->rec.data.TSN_seq, 3174 tp1->sent, 3175 SCTP_FR_LOG_STRIKE_CHUNK); 3176 } 3177 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3178 tp1->sent++; 3179 } 3180 if ((asoc->sctp_cmt_on_off > 0) && 3181 SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) { 3182 /* 3183 * CMT DAC algorithm: If SACK flag is set to 3184 * 0, then lowest_newack test will not pass 3185 * because it would have been set to the 3186 * cumack earlier. If not already to be 3187 * rtx'd, If not a mixed sack and if tp1 is 3188 * not between two sacked TSNs, then mark by 3189 * one more. NOTE that we are marking by one 3190 * additional time since the SACK DAC flag 3191 * indicates that two packets have been 3192 * received after this missing TSN. 3193 */ 3194 if ((tp1->sent < SCTP_DATAGRAM_RESEND) && (num_dests_sacked == 1) && 3195 SCTP_TSN_GT(this_sack_lowest_newack, tp1->rec.data.TSN_seq)) { 3196 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3197 sctp_log_fr(48 + num_dests_sacked, 3198 tp1->rec.data.TSN_seq, 3199 tp1->sent, 3200 SCTP_FR_LOG_STRIKE_CHUNK); 3201 } 3202 tp1->sent++; 3203 } 3204 } 3205 } 3206 if (tp1->sent == SCTP_DATAGRAM_RESEND) { 3207 struct sctp_nets *alt; 3208 3209 /* fix counts and things */ 3210 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3211 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_RSND, 3212 (tp1->whoTo ? (tp1->whoTo->flight_size) : 0), 3213 tp1->book_size, 3214 (uintptr_t) tp1->whoTo, 3215 tp1->rec.data.TSN_seq); 3216 } 3217 if (tp1->whoTo) { 3218 tp1->whoTo->net_ack++; 3219 sctp_flight_size_decrease(tp1); 3220 if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) { 3221 (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo, 3222 tp1); 3223 } 3224 } 3225 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) { 3226 sctp_log_rwnd(SCTP_INCREASE_PEER_RWND, 3227 asoc->peers_rwnd, tp1->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)); 3228 } 3229 /* add back to the rwnd */ 3230 asoc->peers_rwnd += (tp1->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)); 3231 3232 /* remove from the total flight */ 3233 sctp_total_flight_decrease(stcb, tp1); 3234 3235 if ((stcb->asoc.prsctp_supported) && 3236 (PR_SCTP_RTX_ENABLED(tp1->flags))) { 3237 /* 3238 * Has it been retransmitted tv_sec times? - 3239 * we store the retran count there. 3240 */ 3241 if (tp1->snd_count > tp1->rec.data.timetodrop.tv_sec) { 3242 /* Yes, so drop it */ 3243 if (tp1->data != NULL) { 3244 (void)sctp_release_pr_sctp_chunk(stcb, tp1, 1, 3245 SCTP_SO_NOT_LOCKED); 3246 } 3247 /* Make sure to flag we had a FR */ 3248 tp1->whoTo->net_ack++; 3249 continue; 3250 } 3251 } 3252 /* 3253 * SCTP_PRINTF("OK, we are now ready to FR this 3254 * guy\n"); 3255 */ 3256 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3257 sctp_log_fr(tp1->rec.data.TSN_seq, tp1->snd_count, 3258 0, SCTP_FR_MARKED); 3259 } 3260 if (strike_flag) { 3261 /* This is a subsequent FR */ 3262 SCTP_STAT_INCR(sctps_sendmultfastretrans); 3263 } 3264 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3265 if (asoc->sctp_cmt_on_off > 0) { 3266 /* 3267 * CMT: Using RTX_SSTHRESH policy for CMT. 3268 * If CMT is being used, then pick dest with 3269 * largest ssthresh for any retransmission. 3270 */ 3271 tp1->no_fr_allowed = 1; 3272 alt = tp1->whoTo; 3273 /* sa_ignore NO_NULL_CHK */ 3274 if (asoc->sctp_cmt_pf > 0) { 3275 /* 3276 * JRS 5/18/07 - If CMT PF is on, 3277 * use the PF version of 3278 * find_alt_net() 3279 */ 3280 alt = sctp_find_alternate_net(stcb, alt, 2); 3281 } else { 3282 /* 3283 * JRS 5/18/07 - If only CMT is on, 3284 * use the CMT version of 3285 * find_alt_net() 3286 */ 3287 /* sa_ignore NO_NULL_CHK */ 3288 alt = sctp_find_alternate_net(stcb, alt, 1); 3289 } 3290 if (alt == NULL) { 3291 alt = tp1->whoTo; 3292 } 3293 /* 3294 * CUCv2: If a different dest is picked for 3295 * the retransmission, then new 3296 * (rtx-)pseudo_cumack needs to be tracked 3297 * for orig dest. Let CUCv2 track new (rtx-) 3298 * pseudo-cumack always. 3299 */ 3300 if (tp1->whoTo) { 3301 tp1->whoTo->find_pseudo_cumack = 1; 3302 tp1->whoTo->find_rtx_pseudo_cumack = 1; 3303 } 3304 } else {/* CMT is OFF */ 3305 3306 #ifdef SCTP_FR_TO_ALTERNATE 3307 /* Can we find an alternate? */ 3308 alt = sctp_find_alternate_net(stcb, tp1->whoTo, 0); 3309 #else 3310 /* 3311 * default behavior is to NOT retransmit 3312 * FR's to an alternate. Armando Caro's 3313 * paper details why. 3314 */ 3315 alt = tp1->whoTo; 3316 #endif 3317 } 3318 3319 tp1->rec.data.doing_fast_retransmit = 1; 3320 tot_retrans++; 3321 /* mark the sending seq for possible subsequent FR's */ 3322 /* 3323 * SCTP_PRINTF("Marking TSN for FR new value %x\n", 3324 * (uint32_t)tpi->rec.data.TSN_seq); 3325 */ 3326 if (TAILQ_EMPTY(&asoc->send_queue)) { 3327 /* 3328 * If the queue of send is empty then its 3329 * the next sequence number that will be 3330 * assigned so we subtract one from this to 3331 * get the one we last sent. 3332 */ 3333 tp1->rec.data.fast_retran_tsn = sending_seq; 3334 } else { 3335 /* 3336 * If there are chunks on the send queue 3337 * (unsent data that has made it from the 3338 * stream queues but not out the door, we 3339 * take the first one (which will have the 3340 * lowest TSN) and subtract one to get the 3341 * one we last sent. 3342 */ 3343 struct sctp_tmit_chunk *ttt; 3344 3345 ttt = TAILQ_FIRST(&asoc->send_queue); 3346 tp1->rec.data.fast_retran_tsn = 3347 ttt->rec.data.TSN_seq; 3348 } 3349 3350 if (tp1->do_rtt) { 3351 /* 3352 * this guy had a RTO calculation pending on 3353 * it, cancel it 3354 */ 3355 if ((tp1->whoTo != NULL) && 3356 (tp1->whoTo->rto_needed == 0)) { 3357 tp1->whoTo->rto_needed = 1; 3358 } 3359 tp1->do_rtt = 0; 3360 } 3361 if (alt != tp1->whoTo) { 3362 /* yes, there is an alternate. */ 3363 sctp_free_remote_addr(tp1->whoTo); 3364 /* sa_ignore FREED_MEMORY */ 3365 tp1->whoTo = alt; 3366 atomic_add_int(&alt->ref_count, 1); 3367 } 3368 } 3369 } 3370 } 3371 3372 struct sctp_tmit_chunk * 3373 sctp_try_advance_peer_ack_point(struct sctp_tcb *stcb, 3374 struct sctp_association *asoc) 3375 { 3376 struct sctp_tmit_chunk *tp1, *tp2, *a_adv = NULL; 3377 struct timeval now; 3378 int now_filled = 0; 3379 3380 if (asoc->prsctp_supported == 0) { 3381 return (NULL); 3382 } 3383 TAILQ_FOREACH_SAFE(tp1, &asoc->sent_queue, sctp_next, tp2) { 3384 if (tp1->sent != SCTP_FORWARD_TSN_SKIP && 3385 tp1->sent != SCTP_DATAGRAM_RESEND && 3386 tp1->sent != SCTP_DATAGRAM_NR_ACKED) { 3387 /* no chance to advance, out of here */ 3388 break; 3389 } 3390 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) { 3391 if ((tp1->sent == SCTP_FORWARD_TSN_SKIP) || 3392 (tp1->sent == SCTP_DATAGRAM_NR_ACKED)) { 3393 sctp_misc_ints(SCTP_FWD_TSN_CHECK, 3394 asoc->advanced_peer_ack_point, 3395 tp1->rec.data.TSN_seq, 0, 0); 3396 } 3397 } 3398 if (!PR_SCTP_ENABLED(tp1->flags)) { 3399 /* 3400 * We can't fwd-tsn past any that are reliable aka 3401 * retransmitted until the asoc fails. 3402 */ 3403 break; 3404 } 3405 if (!now_filled) { 3406 (void)SCTP_GETTIME_TIMEVAL(&now); 3407 now_filled = 1; 3408 } 3409 /* 3410 * now we got a chunk which is marked for another 3411 * retransmission to a PR-stream but has run out its chances 3412 * already maybe OR has been marked to skip now. Can we skip 3413 * it if its a resend? 3414 */ 3415 if (tp1->sent == SCTP_DATAGRAM_RESEND && 3416 (PR_SCTP_TTL_ENABLED(tp1->flags))) { 3417 /* 3418 * Now is this one marked for resend and its time is 3419 * now up? 3420 */ 3421 if (timevalcmp(&now, &tp1->rec.data.timetodrop, >)) { 3422 /* Yes so drop it */ 3423 if (tp1->data) { 3424 (void)sctp_release_pr_sctp_chunk(stcb, tp1, 3425 1, SCTP_SO_NOT_LOCKED); 3426 } 3427 } else { 3428 /* 3429 * No, we are done when hit one for resend 3430 * whos time as not expired. 3431 */ 3432 break; 3433 } 3434 } 3435 /* 3436 * Ok now if this chunk is marked to drop it we can clean up 3437 * the chunk, advance our peer ack point and we can check 3438 * the next chunk. 3439 */ 3440 if ((tp1->sent == SCTP_FORWARD_TSN_SKIP) || 3441 (tp1->sent == SCTP_DATAGRAM_NR_ACKED)) { 3442 /* advance PeerAckPoint goes forward */ 3443 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, asoc->advanced_peer_ack_point)) { 3444 asoc->advanced_peer_ack_point = tp1->rec.data.TSN_seq; 3445 a_adv = tp1; 3446 } else if (tp1->rec.data.TSN_seq == asoc->advanced_peer_ack_point) { 3447 /* No update but we do save the chk */ 3448 a_adv = tp1; 3449 } 3450 } else { 3451 /* 3452 * If it is still in RESEND we can advance no 3453 * further 3454 */ 3455 break; 3456 } 3457 } 3458 return (a_adv); 3459 } 3460 3461 static int 3462 sctp_fs_audit(struct sctp_association *asoc) 3463 { 3464 struct sctp_tmit_chunk *chk; 3465 int inflight = 0, resend = 0, inbetween = 0, acked = 0, above = 0; 3466 int ret; 3467 3468 #ifndef INVARIANTS 3469 int entry_flight, entry_cnt; 3470 3471 #endif 3472 3473 ret = 0; 3474 #ifndef INVARIANTS 3475 entry_flight = asoc->total_flight; 3476 entry_cnt = asoc->total_flight_count; 3477 #endif 3478 if (asoc->pr_sctp_cnt >= asoc->sent_queue_cnt) 3479 return (0); 3480 3481 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) { 3482 if (chk->sent < SCTP_DATAGRAM_RESEND) { 3483 SCTP_PRINTF("Chk TSN:%u size:%d inflight cnt:%d\n", 3484 chk->rec.data.TSN_seq, 3485 chk->send_size, 3486 chk->snd_count); 3487 inflight++; 3488 } else if (chk->sent == SCTP_DATAGRAM_RESEND) { 3489 resend++; 3490 } else if (chk->sent < SCTP_DATAGRAM_ACKED) { 3491 inbetween++; 3492 } else if (chk->sent > SCTP_DATAGRAM_ACKED) { 3493 above++; 3494 } else { 3495 acked++; 3496 } 3497 } 3498 3499 if ((inflight > 0) || (inbetween > 0)) { 3500 #ifdef INVARIANTS 3501 panic("Flight size-express incorrect? \n"); 3502 #else 3503 SCTP_PRINTF("asoc->total_flight:%d cnt:%d\n", 3504 entry_flight, entry_cnt); 3505 3506 SCTP_PRINTF("Flight size-express incorrect F:%d I:%d R:%d Ab:%d ACK:%d\n", 3507 inflight, inbetween, resend, above, acked); 3508 ret = 1; 3509 #endif 3510 } 3511 return (ret); 3512 } 3513 3514 3515 static void 3516 sctp_window_probe_recovery(struct sctp_tcb *stcb, 3517 struct sctp_association *asoc, 3518 struct sctp_tmit_chunk *tp1) 3519 { 3520 tp1->window_probe = 0; 3521 if ((tp1->sent >= SCTP_DATAGRAM_ACKED) || (tp1->data == NULL)) { 3522 /* TSN's skipped we do NOT move back. */ 3523 sctp_misc_ints(SCTP_FLIGHT_LOG_DWN_WP_FWD, 3524 tp1->whoTo ? tp1->whoTo->flight_size : 0, 3525 tp1->book_size, 3526 (uintptr_t) tp1->whoTo, 3527 tp1->rec.data.TSN_seq); 3528 return; 3529 } 3530 /* First setup this by shrinking flight */ 3531 if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) { 3532 (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo, 3533 tp1); 3534 } 3535 sctp_flight_size_decrease(tp1); 3536 sctp_total_flight_decrease(stcb, tp1); 3537 /* Now mark for resend */ 3538 tp1->sent = SCTP_DATAGRAM_RESEND; 3539 sctp_ucount_incr(asoc->sent_queue_retran_cnt); 3540 3541 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3542 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_WP, 3543 tp1->whoTo->flight_size, 3544 tp1->book_size, 3545 (uintptr_t) tp1->whoTo, 3546 tp1->rec.data.TSN_seq); 3547 } 3548 } 3549 3550 void 3551 sctp_express_handle_sack(struct sctp_tcb *stcb, uint32_t cumack, 3552 uint32_t rwnd, int *abort_now, int ecne_seen) 3553 { 3554 struct sctp_nets *net; 3555 struct sctp_association *asoc; 3556 struct sctp_tmit_chunk *tp1, *tp2; 3557 uint32_t old_rwnd; 3558 int win_probe_recovery = 0; 3559 int win_probe_recovered = 0; 3560 int j, done_once = 0; 3561 int rto_ok = 1; 3562 3563 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_SACK_ARRIVALS_ENABLE) { 3564 sctp_misc_ints(SCTP_SACK_LOG_EXPRESS, cumack, 3565 rwnd, stcb->asoc.last_acked_seq, stcb->asoc.peers_rwnd); 3566 } 3567 SCTP_TCB_LOCK_ASSERT(stcb); 3568 #ifdef SCTP_ASOCLOG_OF_TSNS 3569 stcb->asoc.cumack_log[stcb->asoc.cumack_log_at] = cumack; 3570 stcb->asoc.cumack_log_at++; 3571 if (stcb->asoc.cumack_log_at > SCTP_TSN_LOG_SIZE) { 3572 stcb->asoc.cumack_log_at = 0; 3573 } 3574 #endif 3575 asoc = &stcb->asoc; 3576 old_rwnd = asoc->peers_rwnd; 3577 if (SCTP_TSN_GT(asoc->last_acked_seq, cumack)) { 3578 /* old ack */ 3579 return; 3580 } else if (asoc->last_acked_seq == cumack) { 3581 /* Window update sack */ 3582 asoc->peers_rwnd = sctp_sbspace_sub(rwnd, 3583 (uint32_t) (asoc->total_flight + (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)))); 3584 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 3585 /* SWS sender side engages */ 3586 asoc->peers_rwnd = 0; 3587 } 3588 if (asoc->peers_rwnd > old_rwnd) { 3589 goto again; 3590 } 3591 return; 3592 } 3593 /* First setup for CC stuff */ 3594 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 3595 if (SCTP_TSN_GT(cumack, net->cwr_window_tsn)) { 3596 /* Drag along the window_tsn for cwr's */ 3597 net->cwr_window_tsn = cumack; 3598 } 3599 net->prev_cwnd = net->cwnd; 3600 net->net_ack = 0; 3601 net->net_ack2 = 0; 3602 3603 /* 3604 * CMT: Reset CUC and Fast recovery algo variables before 3605 * SACK processing 3606 */ 3607 net->new_pseudo_cumack = 0; 3608 net->will_exit_fast_recovery = 0; 3609 if (stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack) { 3610 (*stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack) (stcb, net); 3611 } 3612 } 3613 if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) { 3614 uint32_t send_s; 3615 3616 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 3617 tp1 = TAILQ_LAST(&asoc->sent_queue, 3618 sctpchunk_listhead); 3619 send_s = tp1->rec.data.TSN_seq + 1; 3620 } else { 3621 send_s = asoc->sending_seq; 3622 } 3623 if (SCTP_TSN_GE(cumack, send_s)) { 3624 struct mbuf *op_err; 3625 char msg[SCTP_DIAG_INFO_LEN]; 3626 3627 *abort_now = 1; 3628 /* XXX */ 3629 snprintf(msg, sizeof(msg), "Cum ack %8.8x greater or equal than TSN %8.8x", 3630 cumack, send_s); 3631 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 3632 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_23; 3633 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 3634 return; 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, 3829 stcb->sctp_ep, stcb, net, 3830 SCTP_FROM_SCTP_INDATA + SCTP_LOC_24); 3831 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 3832 asoc->cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 3833 /* Done with this net */ 3834 net->net_ack = 0; 3835 } 3836 /* restore any doubled timers */ 3837 net->RTO = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv; 3838 if (net->RTO < stcb->asoc.minrto) { 3839 net->RTO = stcb->asoc.minrto; 3840 } 3841 if (net->RTO > stcb->asoc.maxrto) { 3842 net->RTO = stcb->asoc.maxrto; 3843 } 3844 } 3845 } 3846 asoc->cc_functions.sctp_cwnd_update_after_sack(stcb, asoc, 1, 0, 0); 3847 } 3848 asoc->last_acked_seq = cumack; 3849 3850 if (TAILQ_EMPTY(&asoc->sent_queue)) { 3851 /* nothing left in-flight */ 3852 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 3853 net->flight_size = 0; 3854 net->partial_bytes_acked = 0; 3855 } 3856 asoc->total_flight = 0; 3857 asoc->total_flight_count = 0; 3858 } 3859 /* RWND update */ 3860 asoc->peers_rwnd = sctp_sbspace_sub(rwnd, 3861 (uint32_t) (asoc->total_flight + (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)))); 3862 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 3863 /* SWS sender side engages */ 3864 asoc->peers_rwnd = 0; 3865 } 3866 if (asoc->peers_rwnd > old_rwnd) { 3867 win_probe_recovery = 1; 3868 } 3869 /* Now assure a timer where data is queued at */ 3870 again: 3871 j = 0; 3872 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 3873 int to_ticks; 3874 3875 if (win_probe_recovery && (net->window_probe)) { 3876 win_probe_recovered = 1; 3877 /* 3878 * Find first chunk that was used with window probe 3879 * and clear the sent 3880 */ 3881 /* sa_ignore FREED_MEMORY */ 3882 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 3883 if (tp1->window_probe) { 3884 /* move back to data send queue */ 3885 sctp_window_probe_recovery(stcb, asoc, tp1); 3886 break; 3887 } 3888 } 3889 } 3890 if (net->RTO == 0) { 3891 to_ticks = MSEC_TO_TICKS(stcb->asoc.initial_rto); 3892 } else { 3893 to_ticks = MSEC_TO_TICKS(net->RTO); 3894 } 3895 if (net->flight_size) { 3896 j++; 3897 (void)SCTP_OS_TIMER_START(&net->rxt_timer.timer, to_ticks, 3898 sctp_timeout_handler, &net->rxt_timer); 3899 if (net->window_probe) { 3900 net->window_probe = 0; 3901 } 3902 } else { 3903 if (net->window_probe) { 3904 /* 3905 * In window probes we must assure a timer 3906 * is still running there 3907 */ 3908 net->window_probe = 0; 3909 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { 3910 SCTP_OS_TIMER_START(&net->rxt_timer.timer, to_ticks, 3911 sctp_timeout_handler, &net->rxt_timer); 3912 } 3913 } else if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { 3914 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3915 stcb, net, 3916 SCTP_FROM_SCTP_INDATA + SCTP_LOC_25); 3917 } 3918 } 3919 } 3920 if ((j == 0) && 3921 (!TAILQ_EMPTY(&asoc->sent_queue)) && 3922 (asoc->sent_queue_retran_cnt == 0) && 3923 (win_probe_recovered == 0) && 3924 (done_once == 0)) { 3925 /* 3926 * huh, this should not happen unless all packets are 3927 * PR-SCTP and marked to skip of course. 3928 */ 3929 if (sctp_fs_audit(asoc)) { 3930 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 3931 net->flight_size = 0; 3932 } 3933 asoc->total_flight = 0; 3934 asoc->total_flight_count = 0; 3935 asoc->sent_queue_retran_cnt = 0; 3936 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 3937 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3938 sctp_flight_size_increase(tp1); 3939 sctp_total_flight_increase(stcb, tp1); 3940 } else if (tp1->sent == SCTP_DATAGRAM_RESEND) { 3941 sctp_ucount_incr(asoc->sent_queue_retran_cnt); 3942 } 3943 } 3944 } 3945 done_once = 1; 3946 goto again; 3947 } 3948 /**********************************/ 3949 /* Now what about shutdown issues */ 3950 /**********************************/ 3951 if (TAILQ_EMPTY(&asoc->send_queue) && TAILQ_EMPTY(&asoc->sent_queue)) { 3952 /* nothing left on sendqueue.. consider done */ 3953 /* clean up */ 3954 if ((asoc->stream_queue_cnt == 1) && 3955 ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) || 3956 (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED)) && 3957 (asoc->locked_on_sending) 3958 ) { 3959 struct sctp_stream_queue_pending *sp; 3960 3961 /* 3962 * I may be in a state where we got all across.. but 3963 * cannot write more due to a shutdown... we abort 3964 * since the user did not indicate EOR in this case. 3965 * The sp will be cleaned during free of the asoc. 3966 */ 3967 sp = TAILQ_LAST(&((asoc->locked_on_sending)->outqueue), 3968 sctp_streamhead); 3969 if ((sp) && (sp->length == 0)) { 3970 /* Let cleanup code purge it */ 3971 if (sp->msg_is_complete) { 3972 asoc->stream_queue_cnt--; 3973 } else { 3974 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT; 3975 asoc->locked_on_sending = NULL; 3976 asoc->stream_queue_cnt--; 3977 } 3978 } 3979 } 3980 if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) && 3981 (asoc->stream_queue_cnt == 0)) { 3982 if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) { 3983 /* Need to abort here */ 3984 struct mbuf *op_err; 3985 3986 abort_out_now: 3987 *abort_now = 1; 3988 /* XXX */ 3989 op_err = sctp_generate_cause(SCTP_CAUSE_USER_INITIATED_ABT, ""); 3990 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_26; 3991 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 3992 } else { 3993 struct sctp_nets *netp; 3994 3995 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 3996 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 3997 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 3998 } 3999 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT); 4000 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 4001 sctp_stop_timers_for_shutdown(stcb); 4002 if (asoc->alternate) { 4003 netp = asoc->alternate; 4004 } else { 4005 netp = asoc->primary_destination; 4006 } 4007 sctp_send_shutdown(stcb, netp); 4008 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, 4009 stcb->sctp_ep, stcb, netp); 4010 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 4011 stcb->sctp_ep, stcb, netp); 4012 } 4013 } else if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) && 4014 (asoc->stream_queue_cnt == 0)) { 4015 struct sctp_nets *netp; 4016 4017 if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) { 4018 goto abort_out_now; 4019 } 4020 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 4021 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 4022 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 4023 sctp_stop_timers_for_shutdown(stcb); 4024 if (asoc->alternate) { 4025 netp = asoc->alternate; 4026 } else { 4027 netp = asoc->primary_destination; 4028 } 4029 sctp_send_shutdown_ack(stcb, netp); 4030 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, 4031 stcb->sctp_ep, stcb, netp); 4032 } 4033 } 4034 /*********************************************/ 4035 /* Here we perform PR-SCTP procedures */ 4036 /* (section 4.2) */ 4037 /*********************************************/ 4038 /* C1. update advancedPeerAckPoint */ 4039 if (SCTP_TSN_GT(cumack, asoc->advanced_peer_ack_point)) { 4040 asoc->advanced_peer_ack_point = cumack; 4041 } 4042 /* PR-Sctp issues need to be addressed too */ 4043 if ((asoc->prsctp_supported) && (asoc->pr_sctp_cnt > 0)) { 4044 struct sctp_tmit_chunk *lchk; 4045 uint32_t old_adv_peer_ack_point; 4046 4047 old_adv_peer_ack_point = asoc->advanced_peer_ack_point; 4048 lchk = sctp_try_advance_peer_ack_point(stcb, asoc); 4049 /* C3. See if we need to send a Fwd-TSN */ 4050 if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, cumack)) { 4051 /* 4052 * ISSUE with ECN, see FWD-TSN processing. 4053 */ 4054 if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, old_adv_peer_ack_point)) { 4055 send_forward_tsn(stcb, asoc); 4056 } else if (lchk) { 4057 /* try to FR fwd-tsn's that get lost too */ 4058 if (lchk->rec.data.fwd_tsn_cnt >= 3) { 4059 send_forward_tsn(stcb, asoc); 4060 } 4061 } 4062 } 4063 if (lchk) { 4064 /* Assure a timer is up */ 4065 sctp_timer_start(SCTP_TIMER_TYPE_SEND, 4066 stcb->sctp_ep, stcb, lchk->whoTo); 4067 } 4068 } 4069 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_RWND_LOGGING_ENABLE) { 4070 sctp_misc_ints(SCTP_SACK_RWND_UPDATE, 4071 rwnd, 4072 stcb->asoc.peers_rwnd, 4073 stcb->asoc.total_flight, 4074 stcb->asoc.total_output_queue_size); 4075 } 4076 } 4077 4078 void 4079 sctp_handle_sack(struct mbuf *m, int offset_seg, int offset_dup, 4080 struct sctp_tcb *stcb, 4081 uint16_t num_seg, uint16_t num_nr_seg, uint16_t num_dup, 4082 int *abort_now, uint8_t flags, 4083 uint32_t cum_ack, uint32_t rwnd, int ecne_seen) 4084 { 4085 struct sctp_association *asoc; 4086 struct sctp_tmit_chunk *tp1, *tp2; 4087 uint32_t last_tsn, biggest_tsn_acked, biggest_tsn_newly_acked, this_sack_lowest_newack; 4088 uint16_t wake_him = 0; 4089 uint32_t send_s = 0; 4090 long j; 4091 int accum_moved = 0; 4092 int will_exit_fast_recovery = 0; 4093 uint32_t a_rwnd, old_rwnd; 4094 int win_probe_recovery = 0; 4095 int win_probe_recovered = 0; 4096 struct sctp_nets *net = NULL; 4097 int done_once; 4098 int rto_ok = 1; 4099 uint8_t reneged_all = 0; 4100 uint8_t cmt_dac_flag; 4101 4102 /* 4103 * we take any chance we can to service our queues since we cannot 4104 * get awoken when the socket is read from :< 4105 */ 4106 /* 4107 * Now perform the actual SACK handling: 1) Verify that it is not an 4108 * old sack, if so discard. 2) If there is nothing left in the send 4109 * queue (cum-ack is equal to last acked) then you have a duplicate 4110 * too, update any rwnd change and verify no timers are running. 4111 * then return. 3) Process any new consequtive data i.e. cum-ack 4112 * moved process these first and note that it moved. 4) Process any 4113 * sack blocks. 5) Drop any acked from the queue. 6) Check for any 4114 * revoked blocks and mark. 7) Update the cwnd. 8) Nothing left, 4115 * sync up flightsizes and things, stop all timers and also check 4116 * for shutdown_pending state. If so then go ahead and send off the 4117 * shutdown. If in shutdown recv, send off the shutdown-ack and 4118 * start that timer, Ret. 9) Strike any non-acked things and do FR 4119 * procedure if needed being sure to set the FR flag. 10) Do pr-sctp 4120 * procedures. 11) Apply any FR penalties. 12) Assure we will SACK 4121 * if in shutdown_recv state. 4122 */ 4123 SCTP_TCB_LOCK_ASSERT(stcb); 4124 /* CMT DAC algo */ 4125 this_sack_lowest_newack = 0; 4126 SCTP_STAT_INCR(sctps_slowpath_sack); 4127 last_tsn = cum_ack; 4128 cmt_dac_flag = flags & SCTP_SACK_CMT_DAC; 4129 #ifdef SCTP_ASOCLOG_OF_TSNS 4130 stcb->asoc.cumack_log[stcb->asoc.cumack_log_at] = cum_ack; 4131 stcb->asoc.cumack_log_at++; 4132 if (stcb->asoc.cumack_log_at > SCTP_TSN_LOG_SIZE) { 4133 stcb->asoc.cumack_log_at = 0; 4134 } 4135 #endif 4136 a_rwnd = rwnd; 4137 4138 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_SACK_ARRIVALS_ENABLE) { 4139 sctp_misc_ints(SCTP_SACK_LOG_NORMAL, cum_ack, 4140 rwnd, stcb->asoc.last_acked_seq, stcb->asoc.peers_rwnd); 4141 } 4142 old_rwnd = stcb->asoc.peers_rwnd; 4143 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4144 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4145 stcb->asoc.overall_error_count, 4146 0, 4147 SCTP_FROM_SCTP_INDATA, 4148 __LINE__); 4149 } 4150 stcb->asoc.overall_error_count = 0; 4151 asoc = &stcb->asoc; 4152 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 4153 sctp_log_sack(asoc->last_acked_seq, 4154 cum_ack, 4155 0, 4156 num_seg, 4157 num_dup, 4158 SCTP_LOG_NEW_SACK); 4159 } 4160 if ((num_dup) && (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE)) { 4161 uint16_t i; 4162 uint32_t *dupdata, dblock; 4163 4164 for (i = 0; i < num_dup; i++) { 4165 dupdata = (uint32_t *) sctp_m_getptr(m, offset_dup + i * sizeof(uint32_t), 4166 sizeof(uint32_t), (uint8_t *) & dblock); 4167 if (dupdata == NULL) { 4168 break; 4169 } 4170 sctp_log_fr(*dupdata, 0, 0, SCTP_FR_DUPED); 4171 } 4172 } 4173 if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) { 4174 /* reality check */ 4175 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 4176 tp1 = TAILQ_LAST(&asoc->sent_queue, 4177 sctpchunk_listhead); 4178 send_s = tp1->rec.data.TSN_seq + 1; 4179 } else { 4180 tp1 = NULL; 4181 send_s = asoc->sending_seq; 4182 } 4183 if (SCTP_TSN_GE(cum_ack, send_s)) { 4184 struct mbuf *op_err; 4185 char msg[SCTP_DIAG_INFO_LEN]; 4186 4187 /* 4188 * no way, we have not even sent this TSN out yet. 4189 * Peer is hopelessly messed up with us. 4190 */ 4191 SCTP_PRINTF("NEW cum_ack:%x send_s:%x is smaller or equal\n", 4192 cum_ack, send_s); 4193 if (tp1) { 4194 SCTP_PRINTF("Got send_s from tsn:%x + 1 of tp1:%p\n", 4195 tp1->rec.data.TSN_seq, (void *)tp1); 4196 } 4197 hopeless_peer: 4198 *abort_now = 1; 4199 /* XXX */ 4200 snprintf(msg, sizeof(msg), "Cum ack %8.8x greater or equal than TSN %8.8x", 4201 cum_ack, send_s); 4202 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 4203 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_27; 4204 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 4205 return; 4206 } 4207 } 4208 /**********************/ 4209 /* 1) check the range */ 4210 /**********************/ 4211 if (SCTP_TSN_GT(asoc->last_acked_seq, last_tsn)) { 4212 /* acking something behind */ 4213 return; 4214 } 4215 /* update the Rwnd of the peer */ 4216 if (TAILQ_EMPTY(&asoc->sent_queue) && 4217 TAILQ_EMPTY(&asoc->send_queue) && 4218 (asoc->stream_queue_cnt == 0)) { 4219 /* nothing left on send/sent and strmq */ 4220 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) { 4221 sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK, 4222 asoc->peers_rwnd, 0, 0, a_rwnd); 4223 } 4224 asoc->peers_rwnd = a_rwnd; 4225 if (asoc->sent_queue_retran_cnt) { 4226 asoc->sent_queue_retran_cnt = 0; 4227 } 4228 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4229 /* SWS sender side engages */ 4230 asoc->peers_rwnd = 0; 4231 } 4232 /* stop any timers */ 4233 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4234 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 4235 stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_28); 4236 net->partial_bytes_acked = 0; 4237 net->flight_size = 0; 4238 } 4239 asoc->total_flight = 0; 4240 asoc->total_flight_count = 0; 4241 return; 4242 } 4243 /* 4244 * We init netAckSz and netAckSz2 to 0. These are used to track 2 4245 * things. The total byte count acked is tracked in netAckSz AND 4246 * netAck2 is used to track the total bytes acked that are un- 4247 * amibguious and were never retransmitted. We track these on a per 4248 * destination address basis. 4249 */ 4250 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4251 if (SCTP_TSN_GT(cum_ack, net->cwr_window_tsn)) { 4252 /* Drag along the window_tsn for cwr's */ 4253 net->cwr_window_tsn = cum_ack; 4254 } 4255 net->prev_cwnd = net->cwnd; 4256 net->net_ack = 0; 4257 net->net_ack2 = 0; 4258 4259 /* 4260 * CMT: Reset CUC and Fast recovery algo variables before 4261 * SACK processing 4262 */ 4263 net->new_pseudo_cumack = 0; 4264 net->will_exit_fast_recovery = 0; 4265 if (stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack) { 4266 (*stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack) (stcb, net); 4267 } 4268 } 4269 /* process the new consecutive TSN first */ 4270 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 4271 if (SCTP_TSN_GE(last_tsn, tp1->rec.data.TSN_seq)) { 4272 if (tp1->sent != SCTP_DATAGRAM_UNSENT) { 4273 accum_moved = 1; 4274 if (tp1->sent < SCTP_DATAGRAM_ACKED) { 4275 /* 4276 * If it is less than ACKED, it is 4277 * now no-longer in flight. Higher 4278 * values may occur during marking 4279 */ 4280 if ((tp1->whoTo->dest_state & 4281 SCTP_ADDR_UNCONFIRMED) && 4282 (tp1->snd_count < 2)) { 4283 /* 4284 * If there was no retran 4285 * and the address is 4286 * un-confirmed and we sent 4287 * there and are now 4288 * sacked.. its confirmed, 4289 * mark it so. 4290 */ 4291 tp1->whoTo->dest_state &= 4292 ~SCTP_ADDR_UNCONFIRMED; 4293 } 4294 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 4295 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 4296 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_CA, 4297 tp1->whoTo->flight_size, 4298 tp1->book_size, 4299 (uintptr_t) tp1->whoTo, 4300 tp1->rec.data.TSN_seq); 4301 } 4302 sctp_flight_size_decrease(tp1); 4303 sctp_total_flight_decrease(stcb, tp1); 4304 if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) { 4305 (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo, 4306 tp1); 4307 } 4308 } 4309 tp1->whoTo->net_ack += tp1->send_size; 4310 4311 /* CMT SFR and DAC algos */ 4312 this_sack_lowest_newack = tp1->rec.data.TSN_seq; 4313 tp1->whoTo->saw_newack = 1; 4314 4315 if (tp1->snd_count < 2) { 4316 /* 4317 * True non-retransmited 4318 * chunk 4319 */ 4320 tp1->whoTo->net_ack2 += 4321 tp1->send_size; 4322 4323 /* update RTO too? */ 4324 if (tp1->do_rtt) { 4325 if (rto_ok) { 4326 tp1->whoTo->RTO = 4327 sctp_calculate_rto(stcb, 4328 asoc, tp1->whoTo, 4329 &tp1->sent_rcv_time, 4330 sctp_align_safe_nocopy, 4331 SCTP_RTT_FROM_DATA); 4332 rto_ok = 0; 4333 } 4334 if (tp1->whoTo->rto_needed == 0) { 4335 tp1->whoTo->rto_needed = 1; 4336 } 4337 tp1->do_rtt = 0; 4338 } 4339 } 4340 /* 4341 * CMT: CUCv2 algorithm. From the 4342 * cumack'd TSNs, for each TSN being 4343 * acked for the first time, set the 4344 * following variables for the 4345 * corresp destination. 4346 * new_pseudo_cumack will trigger a 4347 * cwnd update. 4348 * find_(rtx_)pseudo_cumack will 4349 * trigger search for the next 4350 * expected (rtx-)pseudo-cumack. 4351 */ 4352 tp1->whoTo->new_pseudo_cumack = 1; 4353 tp1->whoTo->find_pseudo_cumack = 1; 4354 tp1->whoTo->find_rtx_pseudo_cumack = 1; 4355 4356 4357 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 4358 sctp_log_sack(asoc->last_acked_seq, 4359 cum_ack, 4360 tp1->rec.data.TSN_seq, 4361 0, 4362 0, 4363 SCTP_LOG_TSN_ACKED); 4364 } 4365 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 4366 sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK); 4367 } 4368 } 4369 if (tp1->sent == SCTP_DATAGRAM_RESEND) { 4370 sctp_ucount_decr(asoc->sent_queue_retran_cnt); 4371 #ifdef SCTP_AUDITING_ENABLED 4372 sctp_audit_log(0xB3, 4373 (asoc->sent_queue_retran_cnt & 0x000000ff)); 4374 #endif 4375 } 4376 if (tp1->rec.data.chunk_was_revoked) { 4377 /* deflate the cwnd */ 4378 tp1->whoTo->cwnd -= tp1->book_size; 4379 tp1->rec.data.chunk_was_revoked = 0; 4380 } 4381 if (tp1->sent != SCTP_DATAGRAM_NR_ACKED) { 4382 tp1->sent = SCTP_DATAGRAM_ACKED; 4383 } 4384 } 4385 } else { 4386 break; 4387 } 4388 } 4389 biggest_tsn_newly_acked = biggest_tsn_acked = last_tsn; 4390 /* always set this up to cum-ack */ 4391 asoc->this_sack_highest_gap = last_tsn; 4392 4393 if ((num_seg > 0) || (num_nr_seg > 0)) { 4394 4395 /* 4396 * CMT: SFR algo (and HTNA) - this_sack_highest_newack has 4397 * to be greater than the cumack. Also reset saw_newack to 0 4398 * for all dests. 4399 */ 4400 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4401 net->saw_newack = 0; 4402 net->this_sack_highest_newack = last_tsn; 4403 } 4404 4405 /* 4406 * thisSackHighestGap will increase while handling NEW 4407 * segments this_sack_highest_newack will increase while 4408 * handling NEWLY ACKED chunks. this_sack_lowest_newack is 4409 * used for CMT DAC algo. saw_newack will also change. 4410 */ 4411 if (sctp_handle_segments(m, &offset_seg, stcb, asoc, last_tsn, &biggest_tsn_acked, 4412 &biggest_tsn_newly_acked, &this_sack_lowest_newack, 4413 num_seg, num_nr_seg, &rto_ok)) { 4414 wake_him++; 4415 } 4416 if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) { 4417 /* 4418 * validate the biggest_tsn_acked in the gap acks if 4419 * strict adherence is wanted. 4420 */ 4421 if (SCTP_TSN_GE(biggest_tsn_acked, send_s)) { 4422 /* 4423 * peer is either confused or we are under 4424 * attack. We must abort. 4425 */ 4426 SCTP_PRINTF("Hopeless peer! biggest_tsn_acked:%x largest seq:%x\n", 4427 biggest_tsn_acked, send_s); 4428 goto hopeless_peer; 4429 } 4430 } 4431 } 4432 /*******************************************/ 4433 /* cancel ALL T3-send timer if accum moved */ 4434 /*******************************************/ 4435 if (asoc->sctp_cmt_on_off > 0) { 4436 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4437 if (net->new_pseudo_cumack) 4438 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 4439 stcb, net, 4440 SCTP_FROM_SCTP_INDATA + SCTP_LOC_29); 4441 4442 } 4443 } else { 4444 if (accum_moved) { 4445 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4446 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 4447 stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_30); 4448 } 4449 } 4450 } 4451 /********************************************/ 4452 /* drop the acked chunks from the sentqueue */ 4453 /********************************************/ 4454 asoc->last_acked_seq = cum_ack; 4455 4456 TAILQ_FOREACH_SAFE(tp1, &asoc->sent_queue, sctp_next, tp2) { 4457 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, cum_ack)) { 4458 break; 4459 } 4460 if (tp1->sent != SCTP_DATAGRAM_NR_ACKED) { 4461 if (asoc->strmout[tp1->rec.data.stream_number].chunks_on_queues > 0) { 4462 asoc->strmout[tp1->rec.data.stream_number].chunks_on_queues--; 4463 #ifdef INVARIANTS 4464 } else { 4465 panic("No chunks on the queues for sid %u.", tp1->rec.data.stream_number); 4466 #endif 4467 } 4468 } 4469 TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next); 4470 if (PR_SCTP_ENABLED(tp1->flags)) { 4471 if (asoc->pr_sctp_cnt != 0) 4472 asoc->pr_sctp_cnt--; 4473 } 4474 asoc->sent_queue_cnt--; 4475 if (tp1->data) { 4476 /* sa_ignore NO_NULL_CHK */ 4477 sctp_free_bufspace(stcb, asoc, tp1, 1); 4478 sctp_m_freem(tp1->data); 4479 tp1->data = NULL; 4480 if (asoc->prsctp_supported && PR_SCTP_BUF_ENABLED(tp1->flags)) { 4481 asoc->sent_queue_cnt_removeable--; 4482 } 4483 } 4484 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 4485 sctp_log_sack(asoc->last_acked_seq, 4486 cum_ack, 4487 tp1->rec.data.TSN_seq, 4488 0, 4489 0, 4490 SCTP_LOG_FREE_SENT); 4491 } 4492 sctp_free_a_chunk(stcb, tp1, SCTP_SO_NOT_LOCKED); 4493 wake_him++; 4494 } 4495 if (TAILQ_EMPTY(&asoc->sent_queue) && (asoc->total_flight > 0)) { 4496 #ifdef INVARIANTS 4497 panic("Warning flight size is postive and should be 0"); 4498 #else 4499 SCTP_PRINTF("Warning flight size incorrect should be 0 is %d\n", 4500 asoc->total_flight); 4501 #endif 4502 asoc->total_flight = 0; 4503 } 4504 /* sa_ignore NO_NULL_CHK */ 4505 if ((wake_him) && (stcb->sctp_socket)) { 4506 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4507 struct socket *so; 4508 4509 #endif 4510 SOCKBUF_LOCK(&stcb->sctp_socket->so_snd); 4511 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) { 4512 sctp_wakeup_log(stcb, wake_him, SCTP_WAKESND_FROM_SACK); 4513 } 4514 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4515 so = SCTP_INP_SO(stcb->sctp_ep); 4516 atomic_add_int(&stcb->asoc.refcnt, 1); 4517 SCTP_TCB_UNLOCK(stcb); 4518 SCTP_SOCKET_LOCK(so, 1); 4519 SCTP_TCB_LOCK(stcb); 4520 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4521 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 4522 /* assoc was freed while we were unlocked */ 4523 SCTP_SOCKET_UNLOCK(so, 1); 4524 return; 4525 } 4526 #endif 4527 sctp_sowwakeup_locked(stcb->sctp_ep, stcb->sctp_socket); 4528 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4529 SCTP_SOCKET_UNLOCK(so, 1); 4530 #endif 4531 } else { 4532 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) { 4533 sctp_wakeup_log(stcb, wake_him, SCTP_NOWAKE_FROM_SACK); 4534 } 4535 } 4536 4537 if (asoc->fast_retran_loss_recovery && accum_moved) { 4538 if (SCTP_TSN_GE(asoc->last_acked_seq, asoc->fast_recovery_tsn)) { 4539 /* Setup so we will exit RFC2582 fast recovery */ 4540 will_exit_fast_recovery = 1; 4541 } 4542 } 4543 /* 4544 * Check for revoked fragments: 4545 * 4546 * if Previous sack - Had no frags then we can't have any revoked if 4547 * Previous sack - Had frag's then - If we now have frags aka 4548 * num_seg > 0 call sctp_check_for_revoked() to tell if peer revoked 4549 * some of them. else - The peer revoked all ACKED fragments, since 4550 * we had some before and now we have NONE. 4551 */ 4552 4553 if (num_seg) { 4554 sctp_check_for_revoked(stcb, asoc, cum_ack, biggest_tsn_acked); 4555 asoc->saw_sack_with_frags = 1; 4556 } else if (asoc->saw_sack_with_frags) { 4557 int cnt_revoked = 0; 4558 4559 /* Peer revoked all dg's marked or acked */ 4560 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 4561 if (tp1->sent == SCTP_DATAGRAM_ACKED) { 4562 tp1->sent = SCTP_DATAGRAM_SENT; 4563 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 4564 sctp_misc_ints(SCTP_FLIGHT_LOG_UP_REVOKE, 4565 tp1->whoTo->flight_size, 4566 tp1->book_size, 4567 (uintptr_t) tp1->whoTo, 4568 tp1->rec.data.TSN_seq); 4569 } 4570 sctp_flight_size_increase(tp1); 4571 sctp_total_flight_increase(stcb, tp1); 4572 tp1->rec.data.chunk_was_revoked = 1; 4573 /* 4574 * To ensure that this increase in 4575 * flightsize, which is artificial, does not 4576 * throttle the sender, we also increase the 4577 * cwnd artificially. 4578 */ 4579 tp1->whoTo->cwnd += tp1->book_size; 4580 cnt_revoked++; 4581 } 4582 } 4583 if (cnt_revoked) { 4584 reneged_all = 1; 4585 } 4586 asoc->saw_sack_with_frags = 0; 4587 } 4588 if (num_nr_seg > 0) 4589 asoc->saw_sack_with_nr_frags = 1; 4590 else 4591 asoc->saw_sack_with_nr_frags = 0; 4592 4593 /* JRS - Use the congestion control given in the CC module */ 4594 if (ecne_seen == 0) { 4595 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4596 if (net->net_ack2 > 0) { 4597 /* 4598 * Karn's rule applies to clearing error 4599 * count, this is optional. 4600 */ 4601 net->error_count = 0; 4602 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) { 4603 /* addr came good */ 4604 net->dest_state |= SCTP_ADDR_REACHABLE; 4605 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 4606 0, (void *)net, SCTP_SO_NOT_LOCKED); 4607 } 4608 if (net == stcb->asoc.primary_destination) { 4609 if (stcb->asoc.alternate) { 4610 /* 4611 * release the alternate, 4612 * primary is good 4613 */ 4614 sctp_free_remote_addr(stcb->asoc.alternate); 4615 stcb->asoc.alternate = NULL; 4616 } 4617 } 4618 if (net->dest_state & SCTP_ADDR_PF) { 4619 net->dest_state &= ~SCTP_ADDR_PF; 4620 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, 4621 stcb->sctp_ep, stcb, net, 4622 SCTP_FROM_SCTP_INDATA + SCTP_LOC_31); 4623 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 4624 asoc->cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 4625 /* Done with this net */ 4626 net->net_ack = 0; 4627 } 4628 /* restore any doubled timers */ 4629 net->RTO = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv; 4630 if (net->RTO < stcb->asoc.minrto) { 4631 net->RTO = stcb->asoc.minrto; 4632 } 4633 if (net->RTO > stcb->asoc.maxrto) { 4634 net->RTO = stcb->asoc.maxrto; 4635 } 4636 } 4637 } 4638 asoc->cc_functions.sctp_cwnd_update_after_sack(stcb, asoc, accum_moved, reneged_all, will_exit_fast_recovery); 4639 } 4640 if (TAILQ_EMPTY(&asoc->sent_queue)) { 4641 /* nothing left in-flight */ 4642 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4643 /* stop all timers */ 4644 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 4645 stcb, net, 4646 SCTP_FROM_SCTP_INDATA + SCTP_LOC_32); 4647 net->flight_size = 0; 4648 net->partial_bytes_acked = 0; 4649 } 4650 asoc->total_flight = 0; 4651 asoc->total_flight_count = 0; 4652 } 4653 /**********************************/ 4654 /* Now what about shutdown issues */ 4655 /**********************************/ 4656 if (TAILQ_EMPTY(&asoc->send_queue) && TAILQ_EMPTY(&asoc->sent_queue)) { 4657 /* nothing left on sendqueue.. consider done */ 4658 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) { 4659 sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK, 4660 asoc->peers_rwnd, 0, 0, a_rwnd); 4661 } 4662 asoc->peers_rwnd = a_rwnd; 4663 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4664 /* SWS sender side engages */ 4665 asoc->peers_rwnd = 0; 4666 } 4667 /* clean up */ 4668 if ((asoc->stream_queue_cnt == 1) && 4669 ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) || 4670 (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED)) && 4671 (asoc->locked_on_sending) 4672 ) { 4673 struct sctp_stream_queue_pending *sp; 4674 4675 /* 4676 * I may be in a state where we got all across.. but 4677 * cannot write more due to a shutdown... we abort 4678 * since the user did not indicate EOR in this case. 4679 */ 4680 sp = TAILQ_LAST(&((asoc->locked_on_sending)->outqueue), 4681 sctp_streamhead); 4682 if ((sp) && (sp->length == 0)) { 4683 asoc->locked_on_sending = NULL; 4684 if (sp->msg_is_complete) { 4685 asoc->stream_queue_cnt--; 4686 } else { 4687 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT; 4688 asoc->stream_queue_cnt--; 4689 } 4690 } 4691 } 4692 if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) && 4693 (asoc->stream_queue_cnt == 0)) { 4694 if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) { 4695 /* Need to abort here */ 4696 struct mbuf *op_err; 4697 4698 abort_out_now: 4699 *abort_now = 1; 4700 /* XXX */ 4701 op_err = sctp_generate_cause(SCTP_CAUSE_USER_INITIATED_ABT, ""); 4702 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_33; 4703 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 4704 return; 4705 } else { 4706 struct sctp_nets *netp; 4707 4708 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 4709 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 4710 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 4711 } 4712 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT); 4713 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 4714 sctp_stop_timers_for_shutdown(stcb); 4715 if (asoc->alternate) { 4716 netp = asoc->alternate; 4717 } else { 4718 netp = asoc->primary_destination; 4719 } 4720 sctp_send_shutdown(stcb, netp); 4721 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, 4722 stcb->sctp_ep, stcb, netp); 4723 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 4724 stcb->sctp_ep, stcb, netp); 4725 } 4726 return; 4727 } else if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) && 4728 (asoc->stream_queue_cnt == 0)) { 4729 struct sctp_nets *netp; 4730 4731 if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) { 4732 goto abort_out_now; 4733 } 4734 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 4735 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 4736 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 4737 sctp_stop_timers_for_shutdown(stcb); 4738 if (asoc->alternate) { 4739 netp = asoc->alternate; 4740 } else { 4741 netp = asoc->primary_destination; 4742 } 4743 sctp_send_shutdown_ack(stcb, netp); 4744 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, 4745 stcb->sctp_ep, stcb, netp); 4746 return; 4747 } 4748 } 4749 /* 4750 * Now here we are going to recycle net_ack for a different use... 4751 * HEADS UP. 4752 */ 4753 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4754 net->net_ack = 0; 4755 } 4756 4757 /* 4758 * CMT DAC algorithm: If SACK DAC flag was 0, then no extra marking 4759 * to be done. Setting this_sack_lowest_newack to the cum_ack will 4760 * automatically ensure that. 4761 */ 4762 if ((asoc->sctp_cmt_on_off > 0) && 4763 SCTP_BASE_SYSCTL(sctp_cmt_use_dac) && 4764 (cmt_dac_flag == 0)) { 4765 this_sack_lowest_newack = cum_ack; 4766 } 4767 if ((num_seg > 0) || (num_nr_seg > 0)) { 4768 sctp_strike_gap_ack_chunks(stcb, asoc, biggest_tsn_acked, 4769 biggest_tsn_newly_acked, this_sack_lowest_newack, accum_moved); 4770 } 4771 /* JRS - Use the congestion control given in the CC module */ 4772 asoc->cc_functions.sctp_cwnd_update_after_fr(stcb, asoc); 4773 4774 /* Now are we exiting loss recovery ? */ 4775 if (will_exit_fast_recovery) { 4776 /* Ok, we must exit fast recovery */ 4777 asoc->fast_retran_loss_recovery = 0; 4778 } 4779 if ((asoc->sat_t3_loss_recovery) && 4780 SCTP_TSN_GE(asoc->last_acked_seq, asoc->sat_t3_recovery_tsn)) { 4781 /* end satellite t3 loss recovery */ 4782 asoc->sat_t3_loss_recovery = 0; 4783 } 4784 /* 4785 * CMT Fast recovery 4786 */ 4787 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4788 if (net->will_exit_fast_recovery) { 4789 /* Ok, we must exit fast recovery */ 4790 net->fast_retran_loss_recovery = 0; 4791 } 4792 } 4793 4794 /* Adjust and set the new rwnd value */ 4795 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) { 4796 sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK, 4797 asoc->peers_rwnd, asoc->total_flight, (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)), a_rwnd); 4798 } 4799 asoc->peers_rwnd = sctp_sbspace_sub(a_rwnd, 4800 (uint32_t) (asoc->total_flight + (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)))); 4801 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4802 /* SWS sender side engages */ 4803 asoc->peers_rwnd = 0; 4804 } 4805 if (asoc->peers_rwnd > old_rwnd) { 4806 win_probe_recovery = 1; 4807 } 4808 /* 4809 * Now we must setup so we have a timer up for anyone with 4810 * outstanding data. 4811 */ 4812 done_once = 0; 4813 again: 4814 j = 0; 4815 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4816 if (win_probe_recovery && (net->window_probe)) { 4817 win_probe_recovered = 1; 4818 /*- 4819 * Find first chunk that was used with 4820 * window probe and clear the event. Put 4821 * it back into the send queue as if has 4822 * not been sent. 4823 */ 4824 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 4825 if (tp1->window_probe) { 4826 sctp_window_probe_recovery(stcb, asoc, tp1); 4827 break; 4828 } 4829 } 4830 } 4831 if (net->flight_size) { 4832 j++; 4833 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { 4834 sctp_timer_start(SCTP_TIMER_TYPE_SEND, 4835 stcb->sctp_ep, stcb, net); 4836 } 4837 if (net->window_probe) { 4838 net->window_probe = 0; 4839 } 4840 } else { 4841 if (net->window_probe) { 4842 /* 4843 * In window probes we must assure a timer 4844 * is still running there 4845 */ 4846 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { 4847 sctp_timer_start(SCTP_TIMER_TYPE_SEND, 4848 stcb->sctp_ep, stcb, net); 4849 4850 } 4851 } else if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { 4852 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 4853 stcb, net, 4854 SCTP_FROM_SCTP_INDATA + SCTP_LOC_34); 4855 } 4856 } 4857 } 4858 if ((j == 0) && 4859 (!TAILQ_EMPTY(&asoc->sent_queue)) && 4860 (asoc->sent_queue_retran_cnt == 0) && 4861 (win_probe_recovered == 0) && 4862 (done_once == 0)) { 4863 /* 4864 * huh, this should not happen unless all packets are 4865 * PR-SCTP and marked to skip of course. 4866 */ 4867 if (sctp_fs_audit(asoc)) { 4868 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4869 net->flight_size = 0; 4870 } 4871 asoc->total_flight = 0; 4872 asoc->total_flight_count = 0; 4873 asoc->sent_queue_retran_cnt = 0; 4874 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 4875 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 4876 sctp_flight_size_increase(tp1); 4877 sctp_total_flight_increase(stcb, tp1); 4878 } else if (tp1->sent == SCTP_DATAGRAM_RESEND) { 4879 sctp_ucount_incr(asoc->sent_queue_retran_cnt); 4880 } 4881 } 4882 } 4883 done_once = 1; 4884 goto again; 4885 } 4886 /*********************************************/ 4887 /* Here we perform PR-SCTP procedures */ 4888 /* (section 4.2) */ 4889 /*********************************************/ 4890 /* C1. update advancedPeerAckPoint */ 4891 if (SCTP_TSN_GT(cum_ack, asoc->advanced_peer_ack_point)) { 4892 asoc->advanced_peer_ack_point = cum_ack; 4893 } 4894 /* C2. try to further move advancedPeerAckPoint ahead */ 4895 if ((asoc->prsctp_supported) && (asoc->pr_sctp_cnt > 0)) { 4896 struct sctp_tmit_chunk *lchk; 4897 uint32_t old_adv_peer_ack_point; 4898 4899 old_adv_peer_ack_point = asoc->advanced_peer_ack_point; 4900 lchk = sctp_try_advance_peer_ack_point(stcb, asoc); 4901 /* C3. See if we need to send a Fwd-TSN */ 4902 if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, cum_ack)) { 4903 /* 4904 * ISSUE with ECN, see FWD-TSN processing. 4905 */ 4906 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) { 4907 sctp_misc_ints(SCTP_FWD_TSN_CHECK, 4908 0xee, cum_ack, asoc->advanced_peer_ack_point, 4909 old_adv_peer_ack_point); 4910 } 4911 if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, old_adv_peer_ack_point)) { 4912 send_forward_tsn(stcb, asoc); 4913 } else if (lchk) { 4914 /* try to FR fwd-tsn's that get lost too */ 4915 if (lchk->rec.data.fwd_tsn_cnt >= 3) { 4916 send_forward_tsn(stcb, asoc); 4917 } 4918 } 4919 } 4920 if (lchk) { 4921 /* Assure a timer is up */ 4922 sctp_timer_start(SCTP_TIMER_TYPE_SEND, 4923 stcb->sctp_ep, stcb, lchk->whoTo); 4924 } 4925 } 4926 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_RWND_LOGGING_ENABLE) { 4927 sctp_misc_ints(SCTP_SACK_RWND_UPDATE, 4928 a_rwnd, 4929 stcb->asoc.peers_rwnd, 4930 stcb->asoc.total_flight, 4931 stcb->asoc.total_output_queue_size); 4932 } 4933 } 4934 4935 void 4936 sctp_update_acked(struct sctp_tcb *stcb, struct sctp_shutdown_chunk *cp, int *abort_flag) 4937 { 4938 /* Copy cum-ack */ 4939 uint32_t cum_ack, a_rwnd; 4940 4941 cum_ack = ntohl(cp->cumulative_tsn_ack); 4942 /* Arrange so a_rwnd does NOT change */ 4943 a_rwnd = stcb->asoc.peers_rwnd + stcb->asoc.total_flight; 4944 4945 /* Now call the express sack handling */ 4946 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, abort_flag, 0); 4947 } 4948 4949 static void 4950 sctp_kick_prsctp_reorder_queue(struct sctp_tcb *stcb, 4951 struct sctp_stream_in *strmin) 4952 { 4953 struct sctp_queued_to_read *ctl, *nctl; 4954 struct sctp_association *asoc; 4955 uint16_t tt; 4956 4957 asoc = &stcb->asoc; 4958 tt = strmin->last_sequence_delivered; 4959 /* 4960 * First deliver anything prior to and including the stream no that 4961 * came in 4962 */ 4963 TAILQ_FOREACH_SAFE(ctl, &strmin->inqueue, next, nctl) { 4964 if (SCTP_SSN_GE(tt, ctl->sinfo_ssn)) { 4965 /* this is deliverable now */ 4966 TAILQ_REMOVE(&strmin->inqueue, ctl, next); 4967 /* subtract pending on streams */ 4968 asoc->size_on_all_streams -= ctl->length; 4969 sctp_ucount_decr(asoc->cnt_on_all_streams); 4970 /* deliver it to at least the delivery-q */ 4971 if (stcb->sctp_socket) { 4972 sctp_mark_non_revokable(asoc, ctl->sinfo_tsn); 4973 sctp_add_to_readq(stcb->sctp_ep, stcb, 4974 ctl, 4975 &stcb->sctp_socket->so_rcv, 1, SCTP_READ_LOCK_HELD, SCTP_SO_NOT_LOCKED); 4976 } 4977 } else { 4978 /* no more delivery now. */ 4979 break; 4980 } 4981 } 4982 /* 4983 * now we must deliver things in queue the normal way if any are 4984 * now ready. 4985 */ 4986 tt = strmin->last_sequence_delivered + 1; 4987 TAILQ_FOREACH_SAFE(ctl, &strmin->inqueue, next, nctl) { 4988 if (tt == ctl->sinfo_ssn) { 4989 /* this is deliverable now */ 4990 TAILQ_REMOVE(&strmin->inqueue, ctl, next); 4991 /* subtract pending on streams */ 4992 asoc->size_on_all_streams -= ctl->length; 4993 sctp_ucount_decr(asoc->cnt_on_all_streams); 4994 /* deliver it to at least the delivery-q */ 4995 strmin->last_sequence_delivered = ctl->sinfo_ssn; 4996 if (stcb->sctp_socket) { 4997 sctp_mark_non_revokable(asoc, ctl->sinfo_tsn); 4998 sctp_add_to_readq(stcb->sctp_ep, stcb, 4999 ctl, 5000 &stcb->sctp_socket->so_rcv, 1, SCTP_READ_LOCK_HELD, SCTP_SO_NOT_LOCKED); 5001 5002 } 5003 tt = strmin->last_sequence_delivered + 1; 5004 } else { 5005 break; 5006 } 5007 } 5008 } 5009 5010 static void 5011 sctp_flush_reassm_for_str_seq(struct sctp_tcb *stcb, 5012 struct sctp_association *asoc, 5013 uint16_t stream, uint16_t seq) 5014 { 5015 struct sctp_tmit_chunk *chk, *nchk; 5016 5017 /* For each one on here see if we need to toss it */ 5018 /* 5019 * For now large messages held on the reasmqueue that are complete 5020 * will be tossed too. We could in theory do more work to spin 5021 * through and stop after dumping one msg aka seeing the start of a 5022 * new msg at the head, and call the delivery function... to see if 5023 * it can be delivered... But for now we just dump everything on the 5024 * queue. 5025 */ 5026 TAILQ_FOREACH_SAFE(chk, &asoc->reasmqueue, sctp_next, nchk) { 5027 /* 5028 * Do not toss it if on a different stream or marked for 5029 * unordered delivery in which case the stream sequence 5030 * number has no meaning. 5031 */ 5032 if ((chk->rec.data.stream_number != stream) || 5033 ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == SCTP_DATA_UNORDERED)) { 5034 continue; 5035 } 5036 if (chk->rec.data.stream_seq == seq) { 5037 /* It needs to be tossed */ 5038 TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next); 5039 if (SCTP_TSN_GT(chk->rec.data.TSN_seq, asoc->tsn_last_delivered)) { 5040 asoc->tsn_last_delivered = chk->rec.data.TSN_seq; 5041 asoc->str_of_pdapi = chk->rec.data.stream_number; 5042 asoc->ssn_of_pdapi = chk->rec.data.stream_seq; 5043 asoc->fragment_flags = chk->rec.data.rcv_flags; 5044 } 5045 asoc->size_on_reasm_queue -= chk->send_size; 5046 sctp_ucount_decr(asoc->cnt_on_reasm_queue); 5047 5048 /* Clear up any stream problem */ 5049 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) != SCTP_DATA_UNORDERED && 5050 SCTP_SSN_GT(chk->rec.data.stream_seq, asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered)) { 5051 /* 5052 * We must dump forward this streams 5053 * sequence number if the chunk is not 5054 * unordered that is being skipped. There is 5055 * a chance that if the peer does not 5056 * include the last fragment in its FWD-TSN 5057 * we WILL have a problem here since you 5058 * would have a partial chunk in queue that 5059 * may not be deliverable. Also if a Partial 5060 * delivery API as started the user may get 5061 * a partial chunk. The next read returning 5062 * a new chunk... really ugly but I see no 5063 * way around it! Maybe a notify?? 5064 */ 5065 asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered = chk->rec.data.stream_seq; 5066 } 5067 if (chk->data) { 5068 sctp_m_freem(chk->data); 5069 chk->data = NULL; 5070 } 5071 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 5072 } else if (SCTP_SSN_GT(chk->rec.data.stream_seq, seq)) { 5073 /* 5074 * If the stream_seq is > than the purging one, we 5075 * are done 5076 */ 5077 break; 5078 } 5079 } 5080 } 5081 5082 5083 void 5084 sctp_handle_forward_tsn(struct sctp_tcb *stcb, 5085 struct sctp_forward_tsn_chunk *fwd, 5086 int *abort_flag, struct mbuf *m, int offset) 5087 { 5088 /* The pr-sctp fwd tsn */ 5089 /* 5090 * here we will perform all the data receiver side steps for 5091 * processing FwdTSN, as required in by pr-sctp draft: 5092 * 5093 * Assume we get FwdTSN(x): 5094 * 5095 * 1) update local cumTSN to x 2) try to further advance cumTSN to x + 5096 * others we have 3) examine and update re-ordering queue on 5097 * pr-in-streams 4) clean up re-assembly queue 5) Send a sack to 5098 * report where we are. 5099 */ 5100 struct sctp_association *asoc; 5101 uint32_t new_cum_tsn, gap; 5102 unsigned int i, fwd_sz, m_size; 5103 uint32_t str_seq; 5104 struct sctp_stream_in *strm; 5105 struct sctp_tmit_chunk *chk, *nchk; 5106 struct sctp_queued_to_read *ctl, *sv; 5107 5108 asoc = &stcb->asoc; 5109 if ((fwd_sz = ntohs(fwd->ch.chunk_length)) < sizeof(struct sctp_forward_tsn_chunk)) { 5110 SCTPDBG(SCTP_DEBUG_INDATA1, 5111 "Bad size too small/big fwd-tsn\n"); 5112 return; 5113 } 5114 m_size = (stcb->asoc.mapping_array_size << 3); 5115 /*************************************************************/ 5116 /* 1. Here we update local cumTSN and shift the bitmap array */ 5117 /*************************************************************/ 5118 new_cum_tsn = ntohl(fwd->new_cumulative_tsn); 5119 5120 if (SCTP_TSN_GE(asoc->cumulative_tsn, new_cum_tsn)) { 5121 /* Already got there ... */ 5122 return; 5123 } 5124 /* 5125 * now we know the new TSN is more advanced, let's find the actual 5126 * gap 5127 */ 5128 SCTP_CALC_TSN_TO_GAP(gap, new_cum_tsn, asoc->mapping_array_base_tsn); 5129 asoc->cumulative_tsn = new_cum_tsn; 5130 if (gap >= m_size) { 5131 if ((long)gap > sctp_sbspace(&stcb->asoc, &stcb->sctp_socket->so_rcv)) { 5132 struct mbuf *op_err; 5133 char msg[SCTP_DIAG_INFO_LEN]; 5134 5135 /* 5136 * out of range (of single byte chunks in the rwnd I 5137 * give out). This must be an attacker. 5138 */ 5139 *abort_flag = 1; 5140 snprintf(msg, sizeof(msg), 5141 "New cum ack %8.8x too high, highest TSN %8.8x", 5142 new_cum_tsn, asoc->highest_tsn_inside_map); 5143 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 5144 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_35; 5145 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 5146 return; 5147 } 5148 SCTP_STAT_INCR(sctps_fwdtsn_map_over); 5149 5150 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 5151 asoc->mapping_array_base_tsn = new_cum_tsn + 1; 5152 asoc->highest_tsn_inside_map = new_cum_tsn; 5153 5154 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 5155 asoc->highest_tsn_inside_nr_map = new_cum_tsn; 5156 5157 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 5158 sctp_log_map(0, 3, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 5159 } 5160 } else { 5161 SCTP_TCB_LOCK_ASSERT(stcb); 5162 for (i = 0; i <= gap; i++) { 5163 if (!SCTP_IS_TSN_PRESENT(asoc->mapping_array, i) && 5164 !SCTP_IS_TSN_PRESENT(asoc->nr_mapping_array, i)) { 5165 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, i); 5166 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn + i, asoc->highest_tsn_inside_nr_map)) { 5167 asoc->highest_tsn_inside_nr_map = asoc->mapping_array_base_tsn + i; 5168 } 5169 } 5170 } 5171 } 5172 /*************************************************************/ 5173 /* 2. Clear up re-assembly queue */ 5174 /*************************************************************/ 5175 /* 5176 * First service it if pd-api is up, just in case we can progress it 5177 * forward 5178 */ 5179 if (asoc->fragmented_delivery_inprogress) { 5180 sctp_service_reassembly(stcb, asoc); 5181 } 5182 /* For each one on here see if we need to toss it */ 5183 /* 5184 * For now large messages held on the reasmqueue that are complete 5185 * will be tossed too. We could in theory do more work to spin 5186 * through and stop after dumping one msg aka seeing the start of a 5187 * new msg at the head, and call the delivery function... to see if 5188 * it can be delivered... But for now we just dump everything on the 5189 * queue. 5190 */ 5191 TAILQ_FOREACH_SAFE(chk, &asoc->reasmqueue, sctp_next, nchk) { 5192 if (SCTP_TSN_GE(new_cum_tsn, chk->rec.data.TSN_seq)) { 5193 /* It needs to be tossed */ 5194 TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next); 5195 if (SCTP_TSN_GT(chk->rec.data.TSN_seq, asoc->tsn_last_delivered)) { 5196 asoc->tsn_last_delivered = chk->rec.data.TSN_seq; 5197 asoc->str_of_pdapi = chk->rec.data.stream_number; 5198 asoc->ssn_of_pdapi = chk->rec.data.stream_seq; 5199 asoc->fragment_flags = chk->rec.data.rcv_flags; 5200 } 5201 asoc->size_on_reasm_queue -= chk->send_size; 5202 sctp_ucount_decr(asoc->cnt_on_reasm_queue); 5203 5204 /* Clear up any stream problem */ 5205 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) != SCTP_DATA_UNORDERED && 5206 SCTP_SSN_GT(chk->rec.data.stream_seq, asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered)) { 5207 /* 5208 * We must dump forward this streams 5209 * sequence number if the chunk is not 5210 * unordered that is being skipped. There is 5211 * a chance that if the peer does not 5212 * include the last fragment in its FWD-TSN 5213 * we WILL have a problem here since you 5214 * would have a partial chunk in queue that 5215 * may not be deliverable. Also if a Partial 5216 * delivery API as started the user may get 5217 * a partial chunk. The next read returning 5218 * a new chunk... really ugly but I see no 5219 * way around it! Maybe a notify?? 5220 */ 5221 asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered = chk->rec.data.stream_seq; 5222 } 5223 if (chk->data) { 5224 sctp_m_freem(chk->data); 5225 chk->data = NULL; 5226 } 5227 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 5228 } else { 5229 /* 5230 * Ok we have gone beyond the end of the fwd-tsn's 5231 * mark. 5232 */ 5233 break; 5234 } 5235 } 5236 /*******************************************************/ 5237 /* 3. Update the PR-stream re-ordering queues and fix */ 5238 /* delivery issues as needed. */ 5239 /*******************************************************/ 5240 fwd_sz -= sizeof(*fwd); 5241 if (m && fwd_sz) { 5242 /* New method. */ 5243 unsigned int num_str; 5244 struct sctp_strseq *stseq, strseqbuf; 5245 5246 offset += sizeof(*fwd); 5247 5248 SCTP_INP_READ_LOCK(stcb->sctp_ep); 5249 num_str = fwd_sz / sizeof(struct sctp_strseq); 5250 for (i = 0; i < num_str; i++) { 5251 uint16_t st; 5252 5253 stseq = (struct sctp_strseq *)sctp_m_getptr(m, offset, 5254 sizeof(struct sctp_strseq), 5255 (uint8_t *) & strseqbuf); 5256 offset += sizeof(struct sctp_strseq); 5257 if (stseq == NULL) { 5258 break; 5259 } 5260 /* Convert */ 5261 st = ntohs(stseq->stream); 5262 stseq->stream = st; 5263 st = ntohs(stseq->sequence); 5264 stseq->sequence = st; 5265 5266 /* now process */ 5267 5268 /* 5269 * Ok we now look for the stream/seq on the read 5270 * queue where its not all delivered. If we find it 5271 * we transmute the read entry into a PDI_ABORTED. 5272 */ 5273 if (stseq->stream >= asoc->streamincnt) { 5274 /* screwed up streams, stop! */ 5275 break; 5276 } 5277 if ((asoc->str_of_pdapi == stseq->stream) && 5278 (asoc->ssn_of_pdapi == stseq->sequence)) { 5279 /* 5280 * If this is the one we were partially 5281 * delivering now then we no longer are. 5282 * Note this will change with the reassembly 5283 * re-write. 5284 */ 5285 asoc->fragmented_delivery_inprogress = 0; 5286 } 5287 sctp_flush_reassm_for_str_seq(stcb, asoc, stseq->stream, stseq->sequence); 5288 TAILQ_FOREACH(ctl, &stcb->sctp_ep->read_queue, next) { 5289 if ((ctl->sinfo_stream == stseq->stream) && 5290 (ctl->sinfo_ssn == stseq->sequence)) { 5291 str_seq = (stseq->stream << 16) | stseq->sequence; 5292 ctl->end_added = 1; 5293 ctl->pdapi_aborted = 1; 5294 sv = stcb->asoc.control_pdapi; 5295 stcb->asoc.control_pdapi = ctl; 5296 sctp_ulp_notify(SCTP_NOTIFY_PARTIAL_DELVIERY_INDICATION, 5297 stcb, 5298 SCTP_PARTIAL_DELIVERY_ABORTED, 5299 (void *)&str_seq, 5300 SCTP_SO_NOT_LOCKED); 5301 stcb->asoc.control_pdapi = sv; 5302 break; 5303 } else if ((ctl->sinfo_stream == stseq->stream) && 5304 SCTP_SSN_GT(ctl->sinfo_ssn, stseq->sequence)) { 5305 /* We are past our victim SSN */ 5306 break; 5307 } 5308 } 5309 strm = &asoc->strmin[stseq->stream]; 5310 if (SCTP_SSN_GT(stseq->sequence, strm->last_sequence_delivered)) { 5311 /* Update the sequence number */ 5312 strm->last_sequence_delivered = stseq->sequence; 5313 } 5314 /* now kick the stream the new way */ 5315 /* sa_ignore NO_NULL_CHK */ 5316 sctp_kick_prsctp_reorder_queue(stcb, strm); 5317 } 5318 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 5319 } 5320 /* 5321 * Now slide thing forward. 5322 */ 5323 sctp_slide_mapping_arrays(stcb); 5324 5325 if (!TAILQ_EMPTY(&asoc->reasmqueue)) { 5326 /* now lets kick out and check for more fragmented delivery */ 5327 /* sa_ignore NO_NULL_CHK */ 5328 sctp_deliver_reasm_check(stcb, &stcb->asoc); 5329 } 5330 } 5331