1 /*- 2 * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved. 3 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved. 4 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are met: 8 * 9 * a) Redistributions of source code must retain the above copyright notice, 10 * this list of conditions and the following disclaimer. 11 * 12 * b) Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in 14 * the documentation and/or other materials provided with the distribution. 15 * 16 * c) Neither the name of Cisco Systems, Inc. nor the names of its 17 * contributors may be used to endorse or promote products derived 18 * from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 22 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 30 * THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #include <netinet/sctp_os.h> 37 #include <netinet/sctp_var.h> 38 #include <netinet/sctp_sysctl.h> 39 #include <netinet/sctp_pcb.h> 40 #include <netinet/sctp_header.h> 41 #include <netinet/sctputil.h> 42 #include <netinet/sctp_output.h> 43 #include <netinet/sctp_input.h> 44 #include <netinet/sctp_indata.h> 45 #include <netinet/sctp_uio.h> 46 #include <netinet/sctp_timer.h> 47 48 49 /* 50 * NOTES: On the outbound side of things I need to check the sack timer to 51 * see if I should generate a sack into the chunk queue (if I have data to 52 * send that is and will be sending it .. for bundling. 53 * 54 * The callback in sctp_usrreq.c will get called when the socket is read from. 55 * This will cause sctp_service_queues() to get called on the top entry in 56 * the list. 57 */ 58 59 void 60 sctp_set_rwnd(struct sctp_tcb *stcb, struct sctp_association *asoc) 61 { 62 asoc->my_rwnd = sctp_calc_rwnd(stcb, asoc); 63 } 64 65 /* Calculate what the rwnd would be */ 66 uint32_t 67 sctp_calc_rwnd(struct sctp_tcb *stcb, struct sctp_association *asoc) 68 { 69 uint32_t calc = 0; 70 71 /* 72 * This is really set wrong with respect to a 1-2-m socket. Since 73 * the sb_cc is the count that everyone as put up. When we re-write 74 * sctp_soreceive then we will fix this so that ONLY this 75 * associations data is taken into account. 76 */ 77 if (stcb->sctp_socket == NULL) 78 return (calc); 79 80 if (stcb->asoc.sb_cc == 0 && 81 asoc->size_on_reasm_queue == 0 && 82 asoc->size_on_all_streams == 0) { 83 /* Full rwnd granted */ 84 calc = max(SCTP_SB_LIMIT_RCV(stcb->sctp_socket), SCTP_MINIMAL_RWND); 85 return (calc); 86 } 87 /* get actual space */ 88 calc = (uint32_t) sctp_sbspace(&stcb->asoc, &stcb->sctp_socket->so_rcv); 89 90 /* 91 * take out what has NOT been put on socket queue and we yet hold 92 * for putting up. 93 */ 94 calc = sctp_sbspace_sub(calc, (uint32_t) (asoc->size_on_reasm_queue + 95 asoc->cnt_on_reasm_queue * MSIZE)); 96 calc = sctp_sbspace_sub(calc, (uint32_t) (asoc->size_on_all_streams + 97 asoc->cnt_on_all_streams * MSIZE)); 98 99 if (calc == 0) { 100 /* out of space */ 101 return (calc); 102 } 103 /* what is the overhead of all these rwnd's */ 104 calc = sctp_sbspace_sub(calc, stcb->asoc.my_rwnd_control_len); 105 /* 106 * If the window gets too small due to ctrl-stuff, reduce it to 1, 107 * even it is 0. SWS engaged 108 */ 109 if (calc < stcb->asoc.my_rwnd_control_len) { 110 calc = 1; 111 } 112 return (calc); 113 } 114 115 116 117 /* 118 * Build out our readq entry based on the incoming packet. 119 */ 120 struct sctp_queued_to_read * 121 sctp_build_readq_entry(struct sctp_tcb *stcb, 122 struct sctp_nets *net, 123 uint32_t tsn, uint32_t ppid, 124 uint32_t context, uint16_t stream_no, 125 uint16_t stream_seq, uint8_t flags, 126 struct mbuf *dm) 127 { 128 struct sctp_queued_to_read *read_queue_e = NULL; 129 130 sctp_alloc_a_readq(stcb, read_queue_e); 131 if (read_queue_e == NULL) { 132 goto failed_build; 133 } 134 read_queue_e->sinfo_stream = stream_no; 135 read_queue_e->sinfo_ssn = stream_seq; 136 read_queue_e->sinfo_flags = (flags << 8); 137 read_queue_e->sinfo_ppid = ppid; 138 read_queue_e->sinfo_context = context; 139 read_queue_e->sinfo_timetolive = 0; 140 read_queue_e->sinfo_tsn = tsn; 141 read_queue_e->sinfo_cumtsn = tsn; 142 read_queue_e->sinfo_assoc_id = sctp_get_associd(stcb); 143 read_queue_e->whoFrom = net; 144 read_queue_e->length = 0; 145 atomic_add_int(&net->ref_count, 1); 146 read_queue_e->data = dm; 147 read_queue_e->spec_flags = 0; 148 read_queue_e->tail_mbuf = NULL; 149 read_queue_e->aux_data = NULL; 150 read_queue_e->stcb = stcb; 151 read_queue_e->port_from = stcb->rport; 152 read_queue_e->do_not_ref_stcb = 0; 153 read_queue_e->end_added = 0; 154 read_queue_e->some_taken = 0; 155 read_queue_e->pdapi_aborted = 0; 156 failed_build: 157 return (read_queue_e); 158 } 159 160 161 /* 162 * Build out our readq entry based on the incoming packet. 163 */ 164 static struct sctp_queued_to_read * 165 sctp_build_readq_entry_chk(struct sctp_tcb *stcb, 166 struct sctp_tmit_chunk *chk) 167 { 168 struct sctp_queued_to_read *read_queue_e = NULL; 169 170 sctp_alloc_a_readq(stcb, read_queue_e); 171 if (read_queue_e == NULL) { 172 goto failed_build; 173 } 174 read_queue_e->sinfo_stream = chk->rec.data.stream_number; 175 read_queue_e->sinfo_ssn = chk->rec.data.stream_seq; 176 read_queue_e->sinfo_flags = (chk->rec.data.rcv_flags << 8); 177 read_queue_e->sinfo_ppid = chk->rec.data.payloadtype; 178 read_queue_e->sinfo_context = stcb->asoc.context; 179 read_queue_e->sinfo_timetolive = 0; 180 read_queue_e->sinfo_tsn = chk->rec.data.TSN_seq; 181 read_queue_e->sinfo_cumtsn = chk->rec.data.TSN_seq; 182 read_queue_e->sinfo_assoc_id = sctp_get_associd(stcb); 183 read_queue_e->whoFrom = chk->whoTo; 184 read_queue_e->aux_data = NULL; 185 read_queue_e->length = 0; 186 atomic_add_int(&chk->whoTo->ref_count, 1); 187 read_queue_e->data = chk->data; 188 read_queue_e->tail_mbuf = NULL; 189 read_queue_e->stcb = stcb; 190 read_queue_e->port_from = stcb->rport; 191 read_queue_e->spec_flags = 0; 192 read_queue_e->do_not_ref_stcb = 0; 193 read_queue_e->end_added = 0; 194 read_queue_e->some_taken = 0; 195 read_queue_e->pdapi_aborted = 0; 196 failed_build: 197 return (read_queue_e); 198 } 199 200 201 struct mbuf * 202 sctp_build_ctl_nchunk(struct sctp_inpcb *inp, struct sctp_sndrcvinfo *sinfo) 203 { 204 struct sctp_extrcvinfo *seinfo; 205 struct sctp_sndrcvinfo *outinfo; 206 struct sctp_rcvinfo *rcvinfo; 207 struct sctp_nxtinfo *nxtinfo; 208 struct cmsghdr *cmh; 209 struct mbuf *ret; 210 int len; 211 int use_extended; 212 int provide_nxt; 213 214 if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_RECVDATAIOEVNT) && 215 sctp_is_feature_off(inp, SCTP_PCB_FLAGS_RECVRCVINFO) && 216 sctp_is_feature_off(inp, SCTP_PCB_FLAGS_RECVNXTINFO)) { 217 /* user does not want any ancillary data */ 218 return (NULL); 219 } 220 len = 0; 221 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVRCVINFO)) { 222 len += CMSG_SPACE(sizeof(struct sctp_rcvinfo)); 223 } 224 seinfo = (struct sctp_extrcvinfo *)sinfo; 225 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVNXTINFO) && 226 (seinfo->sreinfo_next_flags & SCTP_NEXT_MSG_AVAIL)) { 227 provide_nxt = 1; 228 len += CMSG_SPACE(sizeof(struct sctp_rcvinfo)); 229 } else { 230 provide_nxt = 0; 231 } 232 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVDATAIOEVNT)) { 233 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXT_RCVINFO)) { 234 use_extended = 1; 235 len += CMSG_SPACE(sizeof(struct sctp_extrcvinfo)); 236 } else { 237 use_extended = 0; 238 len += CMSG_SPACE(sizeof(struct sctp_sndrcvinfo)); 239 } 240 } else { 241 use_extended = 0; 242 } 243 244 ret = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA); 245 if (ret == NULL) { 246 /* No space */ 247 return (ret); 248 } 249 SCTP_BUF_LEN(ret) = 0; 250 251 /* We need a CMSG header followed by the struct */ 252 cmh = mtod(ret, struct cmsghdr *); 253 /* 254 * Make sure that there is no un-initialized padding between the 255 * cmsg header and cmsg data and after the cmsg data. 256 */ 257 memset(cmh, 0, len); 258 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVRCVINFO)) { 259 cmh->cmsg_level = IPPROTO_SCTP; 260 cmh->cmsg_len = CMSG_LEN(sizeof(struct sctp_rcvinfo)); 261 cmh->cmsg_type = SCTP_RCVINFO; 262 rcvinfo = (struct sctp_rcvinfo *)CMSG_DATA(cmh); 263 rcvinfo->rcv_sid = sinfo->sinfo_stream; 264 rcvinfo->rcv_ssn = sinfo->sinfo_ssn; 265 rcvinfo->rcv_flags = sinfo->sinfo_flags; 266 rcvinfo->rcv_ppid = sinfo->sinfo_ppid; 267 rcvinfo->rcv_tsn = sinfo->sinfo_tsn; 268 rcvinfo->rcv_cumtsn = sinfo->sinfo_cumtsn; 269 rcvinfo->rcv_context = sinfo->sinfo_context; 270 rcvinfo->rcv_assoc_id = sinfo->sinfo_assoc_id; 271 cmh = (struct cmsghdr *)((caddr_t)cmh + CMSG_SPACE(sizeof(struct sctp_rcvinfo))); 272 SCTP_BUF_LEN(ret) += CMSG_SPACE(sizeof(struct sctp_rcvinfo)); 273 } 274 if (provide_nxt) { 275 cmh->cmsg_level = IPPROTO_SCTP; 276 cmh->cmsg_len = CMSG_LEN(sizeof(struct sctp_nxtinfo)); 277 cmh->cmsg_type = SCTP_NXTINFO; 278 nxtinfo = (struct sctp_nxtinfo *)CMSG_DATA(cmh); 279 nxtinfo->nxt_sid = seinfo->sreinfo_next_stream; 280 nxtinfo->nxt_flags = 0; 281 if (seinfo->sreinfo_next_flags & SCTP_NEXT_MSG_IS_UNORDERED) { 282 nxtinfo->nxt_flags |= SCTP_UNORDERED; 283 } 284 if (seinfo->sreinfo_next_flags & SCTP_NEXT_MSG_IS_NOTIFICATION) { 285 nxtinfo->nxt_flags |= SCTP_NOTIFICATION; 286 } 287 if (seinfo->sreinfo_next_flags & SCTP_NEXT_MSG_ISCOMPLETE) { 288 nxtinfo->nxt_flags |= SCTP_COMPLETE; 289 } 290 nxtinfo->nxt_ppid = seinfo->sreinfo_next_ppid; 291 nxtinfo->nxt_length = seinfo->sreinfo_next_length; 292 nxtinfo->nxt_assoc_id = seinfo->sreinfo_next_aid; 293 cmh = (struct cmsghdr *)((caddr_t)cmh + CMSG_SPACE(sizeof(struct sctp_nxtinfo))); 294 SCTP_BUF_LEN(ret) += CMSG_SPACE(sizeof(struct sctp_nxtinfo)); 295 } 296 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVDATAIOEVNT)) { 297 cmh->cmsg_level = IPPROTO_SCTP; 298 outinfo = (struct sctp_sndrcvinfo *)CMSG_DATA(cmh); 299 if (use_extended) { 300 cmh->cmsg_len = CMSG_LEN(sizeof(struct sctp_extrcvinfo)); 301 cmh->cmsg_type = SCTP_EXTRCV; 302 memcpy(outinfo, sinfo, sizeof(struct sctp_extrcvinfo)); 303 SCTP_BUF_LEN(ret) += CMSG_SPACE(sizeof(struct sctp_extrcvinfo)); 304 } else { 305 cmh->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo)); 306 cmh->cmsg_type = SCTP_SNDRCV; 307 *outinfo = *sinfo; 308 SCTP_BUF_LEN(ret) += CMSG_SPACE(sizeof(struct sctp_sndrcvinfo)); 309 } 310 } 311 return (ret); 312 } 313 314 315 static void 316 sctp_mark_non_revokable(struct sctp_association *asoc, uint32_t tsn) 317 { 318 uint32_t gap, i, cumackp1; 319 int fnd = 0; 320 321 if (SCTP_BASE_SYSCTL(sctp_do_drain) == 0) { 322 return; 323 } 324 cumackp1 = asoc->cumulative_tsn + 1; 325 if (SCTP_TSN_GT(cumackp1, tsn)) { 326 /* 327 * this tsn is behind the cum ack and thus we don't need to 328 * worry about it being moved from one to the other. 329 */ 330 return; 331 } 332 SCTP_CALC_TSN_TO_GAP(gap, tsn, asoc->mapping_array_base_tsn); 333 if (!SCTP_IS_TSN_PRESENT(asoc->mapping_array, gap)) { 334 SCTP_PRINTF("gap:%x tsn:%x\n", gap, tsn); 335 sctp_print_mapping_array(asoc); 336 #ifdef INVARIANTS 337 panic("Things are really messed up now!!"); 338 #endif 339 } 340 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap); 341 SCTP_UNSET_TSN_PRESENT(asoc->mapping_array, gap); 342 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) { 343 asoc->highest_tsn_inside_nr_map = tsn; 344 } 345 if (tsn == asoc->highest_tsn_inside_map) { 346 /* We must back down to see what the new highest is */ 347 for (i = tsn - 1; SCTP_TSN_GE(i, asoc->mapping_array_base_tsn); i--) { 348 SCTP_CALC_TSN_TO_GAP(gap, i, asoc->mapping_array_base_tsn); 349 if (SCTP_IS_TSN_PRESENT(asoc->mapping_array, gap)) { 350 asoc->highest_tsn_inside_map = i; 351 fnd = 1; 352 break; 353 } 354 } 355 if (!fnd) { 356 asoc->highest_tsn_inside_map = asoc->mapping_array_base_tsn - 1; 357 } 358 } 359 } 360 361 362 /* 363 * We are delivering currently from the reassembly queue. We must continue to 364 * deliver until we either: 1) run out of space. 2) run out of sequential 365 * TSN's 3) hit the SCTP_DATA_LAST_FRAG flag. 366 */ 367 static void 368 sctp_service_reassembly(struct sctp_tcb *stcb, struct sctp_association *asoc) 369 { 370 struct sctp_tmit_chunk *chk, *nchk; 371 uint16_t nxt_todel; 372 uint16_t stream_no; 373 int end = 0; 374 int cntDel; 375 struct sctp_queued_to_read *control, *ctl, *nctl; 376 377 if (stcb == NULL) 378 return; 379 380 cntDel = stream_no = 0; 381 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 382 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) || 383 (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET)) { 384 /* socket above is long gone or going.. */ 385 abandon: 386 asoc->fragmented_delivery_inprogress = 0; 387 TAILQ_FOREACH_SAFE(chk, &asoc->reasmqueue, sctp_next, nchk) { 388 TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next); 389 asoc->size_on_reasm_queue -= chk->send_size; 390 sctp_ucount_decr(asoc->cnt_on_reasm_queue); 391 /* 392 * Lose the data pointer, since its in the socket 393 * buffer 394 */ 395 if (chk->data) { 396 sctp_m_freem(chk->data); 397 chk->data = NULL; 398 } 399 /* Now free the address and data */ 400 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 401 /* sa_ignore FREED_MEMORY */ 402 } 403 return; 404 } 405 SCTP_TCB_LOCK_ASSERT(stcb); 406 TAILQ_FOREACH_SAFE(chk, &asoc->reasmqueue, sctp_next, nchk) { 407 if (chk->rec.data.TSN_seq != (asoc->tsn_last_delivered + 1)) { 408 /* Can't deliver more :< */ 409 return; 410 } 411 stream_no = chk->rec.data.stream_number; 412 nxt_todel = asoc->strmin[stream_no].last_sequence_delivered + 1; 413 if (nxt_todel != chk->rec.data.stream_seq && 414 (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) { 415 /* 416 * Not the next sequence to deliver in its stream OR 417 * unordered 418 */ 419 return; 420 } 421 if (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) { 422 423 control = sctp_build_readq_entry_chk(stcb, chk); 424 if (control == NULL) { 425 /* out of memory? */ 426 return; 427 } 428 /* save it off for our future deliveries */ 429 stcb->asoc.control_pdapi = control; 430 if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) 431 end = 1; 432 else 433 end = 0; 434 sctp_mark_non_revokable(asoc, chk->rec.data.TSN_seq); 435 sctp_add_to_readq(stcb->sctp_ep, 436 stcb, control, &stcb->sctp_socket->so_rcv, end, 437 SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED); 438 cntDel++; 439 } else { 440 if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) 441 end = 1; 442 else 443 end = 0; 444 sctp_mark_non_revokable(asoc, chk->rec.data.TSN_seq); 445 if (sctp_append_to_readq(stcb->sctp_ep, stcb, 446 stcb->asoc.control_pdapi, 447 chk->data, end, chk->rec.data.TSN_seq, 448 &stcb->sctp_socket->so_rcv)) { 449 /* 450 * something is very wrong, either 451 * control_pdapi is NULL, or the tail_mbuf 452 * is corrupt, or there is a EOM already on 453 * the mbuf chain. 454 */ 455 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) { 456 goto abandon; 457 } else { 458 #ifdef INVARIANTS 459 if ((stcb->asoc.control_pdapi == NULL) || (stcb->asoc.control_pdapi->tail_mbuf == NULL)) { 460 panic("This should not happen control_pdapi NULL?"); 461 } 462 /* if we did not panic, it was a EOM */ 463 panic("Bad chunking ??"); 464 #else 465 if ((stcb->asoc.control_pdapi == NULL) || (stcb->asoc.control_pdapi->tail_mbuf == NULL)) { 466 SCTP_PRINTF("This should not happen control_pdapi NULL?\n"); 467 } 468 SCTP_PRINTF("Bad chunking ??\n"); 469 SCTP_PRINTF("Dumping re-assembly queue this will probably hose the association\n"); 470 471 #endif 472 goto abandon; 473 } 474 } 475 cntDel++; 476 } 477 /* pull it we did it */ 478 TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next); 479 if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) { 480 asoc->fragmented_delivery_inprogress = 0; 481 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) { 482 asoc->strmin[stream_no].last_sequence_delivered++; 483 } 484 if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0) { 485 SCTP_STAT_INCR_COUNTER64(sctps_reasmusrmsgs); 486 } 487 } else if (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) { 488 /* 489 * turn the flag back on since we just delivered 490 * yet another one. 491 */ 492 asoc->fragmented_delivery_inprogress = 1; 493 } 494 asoc->tsn_of_pdapi_last_delivered = chk->rec.data.TSN_seq; 495 asoc->last_flags_delivered = chk->rec.data.rcv_flags; 496 asoc->last_strm_seq_delivered = chk->rec.data.stream_seq; 497 asoc->last_strm_no_delivered = chk->rec.data.stream_number; 498 499 asoc->tsn_last_delivered = chk->rec.data.TSN_seq; 500 asoc->size_on_reasm_queue -= chk->send_size; 501 sctp_ucount_decr(asoc->cnt_on_reasm_queue); 502 /* free up the chk */ 503 chk->data = NULL; 504 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 505 506 if (asoc->fragmented_delivery_inprogress == 0) { 507 /* 508 * Now lets see if we can deliver the next one on 509 * the stream 510 */ 511 struct sctp_stream_in *strm; 512 513 strm = &asoc->strmin[stream_no]; 514 nxt_todel = strm->last_sequence_delivered + 1; 515 TAILQ_FOREACH_SAFE(ctl, &strm->inqueue, next, nctl) { 516 /* Deliver more if we can. */ 517 if (nxt_todel == ctl->sinfo_ssn) { 518 TAILQ_REMOVE(&strm->inqueue, ctl, next); 519 asoc->size_on_all_streams -= ctl->length; 520 sctp_ucount_decr(asoc->cnt_on_all_streams); 521 strm->last_sequence_delivered++; 522 sctp_mark_non_revokable(asoc, ctl->sinfo_tsn); 523 sctp_add_to_readq(stcb->sctp_ep, stcb, 524 ctl, 525 &stcb->sctp_socket->so_rcv, 1, 526 SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED); 527 } else { 528 break; 529 } 530 nxt_todel = strm->last_sequence_delivered + 1; 531 } 532 break; 533 } 534 } 535 } 536 537 /* 538 * Queue the chunk either right into the socket buffer if it is the next one 539 * to go OR put it in the correct place in the delivery queue. If we do 540 * append to the so_buf, keep doing so until we are out of order. One big 541 * question still remains, what to do when the socket buffer is FULL?? 542 */ 543 static void 544 sctp_queue_data_to_stream(struct sctp_tcb *stcb, struct sctp_association *asoc, 545 struct sctp_queued_to_read *control, int *abort_flag) 546 { 547 /* 548 * FIX-ME maybe? What happens when the ssn wraps? If we are getting 549 * all the data in one stream this could happen quite rapidly. One 550 * could use the TSN to keep track of things, but this scheme breaks 551 * down in the other type of stream useage that could occur. Send a 552 * single msg to stream 0, send 4Billion messages to stream 1, now 553 * send a message to stream 0. You have a situation where the TSN 554 * has wrapped but not in the stream. Is this worth worrying about 555 * or should we just change our queue sort at the bottom to be by 556 * TSN. 557 * 558 * Could it also be legal for a peer to send ssn 1 with TSN 2 and ssn 2 559 * with TSN 1? If the peer is doing some sort of funky TSN/SSN 560 * assignment this could happen... and I don't see how this would be 561 * a violation. So for now I am undecided an will leave the sort by 562 * SSN alone. Maybe a hybred approach is the answer 563 * 564 */ 565 struct sctp_stream_in *strm; 566 struct sctp_queued_to_read *at; 567 int queue_needed; 568 uint16_t nxt_todel; 569 struct mbuf *op_err; 570 char msg[SCTP_DIAG_INFO_LEN]; 571 572 queue_needed = 1; 573 asoc->size_on_all_streams += control->length; 574 sctp_ucount_incr(asoc->cnt_on_all_streams); 575 strm = &asoc->strmin[control->sinfo_stream]; 576 nxt_todel = strm->last_sequence_delivered + 1; 577 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { 578 sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_INTO_STRD); 579 } 580 SCTPDBG(SCTP_DEBUG_INDATA1, 581 "queue to stream called for ssn:%u lastdel:%u nxt:%u\n", 582 (uint32_t) control->sinfo_stream, 583 (uint32_t) strm->last_sequence_delivered, 584 (uint32_t) nxt_todel); 585 if (SCTP_SSN_GE(strm->last_sequence_delivered, control->sinfo_ssn)) { 586 /* The incoming sseq is behind where we last delivered? */ 587 SCTPDBG(SCTP_DEBUG_INDATA1, "Duplicate S-SEQ:%d delivered:%d from peer, Abort association\n", 588 control->sinfo_ssn, strm->last_sequence_delivered); 589 protocol_error: 590 /* 591 * throw it in the stream so it gets cleaned up in 592 * association destruction 593 */ 594 TAILQ_INSERT_HEAD(&strm->inqueue, control, next); 595 snprintf(msg, sizeof(msg), "Delivered SSN=%4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", 596 strm->last_sequence_delivered, control->sinfo_tsn, 597 control->sinfo_stream, control->sinfo_ssn); 598 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 599 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_1; 600 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 601 *abort_flag = 1; 602 return; 603 604 } 605 if (nxt_todel == control->sinfo_ssn) { 606 /* can be delivered right away? */ 607 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { 608 sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_IMMED_DEL); 609 } 610 /* EY it wont be queued if it could be delivered directly */ 611 queue_needed = 0; 612 asoc->size_on_all_streams -= control->length; 613 sctp_ucount_decr(asoc->cnt_on_all_streams); 614 strm->last_sequence_delivered++; 615 616 sctp_mark_non_revokable(asoc, control->sinfo_tsn); 617 sctp_add_to_readq(stcb->sctp_ep, stcb, 618 control, 619 &stcb->sctp_socket->so_rcv, 1, 620 SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED); 621 TAILQ_FOREACH_SAFE(control, &strm->inqueue, next, at) { 622 /* all delivered */ 623 nxt_todel = strm->last_sequence_delivered + 1; 624 if (nxt_todel == control->sinfo_ssn) { 625 TAILQ_REMOVE(&strm->inqueue, control, next); 626 asoc->size_on_all_streams -= control->length; 627 sctp_ucount_decr(asoc->cnt_on_all_streams); 628 strm->last_sequence_delivered++; 629 /* 630 * We ignore the return of deliver_data here 631 * since we always can hold the chunk on the 632 * d-queue. And we have a finite number that 633 * can be delivered from the strq. 634 */ 635 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { 636 sctp_log_strm_del(control, NULL, 637 SCTP_STR_LOG_FROM_IMMED_DEL); 638 } 639 sctp_mark_non_revokable(asoc, control->sinfo_tsn); 640 sctp_add_to_readq(stcb->sctp_ep, stcb, 641 control, 642 &stcb->sctp_socket->so_rcv, 1, 643 SCTP_READ_LOCK_NOT_HELD, 644 SCTP_SO_NOT_LOCKED); 645 continue; 646 } 647 break; 648 } 649 } 650 if (queue_needed) { 651 /* 652 * Ok, we did not deliver this guy, find the correct place 653 * to put it on the queue. 654 */ 655 if (SCTP_TSN_GE(asoc->cumulative_tsn, control->sinfo_tsn)) { 656 goto protocol_error; 657 } 658 if (TAILQ_EMPTY(&strm->inqueue)) { 659 /* Empty queue */ 660 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { 661 sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_INSERT_HD); 662 } 663 TAILQ_INSERT_HEAD(&strm->inqueue, control, next); 664 } else { 665 TAILQ_FOREACH(at, &strm->inqueue, next) { 666 if (SCTP_SSN_GT(at->sinfo_ssn, control->sinfo_ssn)) { 667 /* 668 * one in queue is bigger than the 669 * new one, insert before this one 670 */ 671 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { 672 sctp_log_strm_del(control, at, 673 SCTP_STR_LOG_FROM_INSERT_MD); 674 } 675 TAILQ_INSERT_BEFORE(at, control, next); 676 break; 677 } else if (at->sinfo_ssn == control->sinfo_ssn) { 678 /* 679 * Gak, He sent me a duplicate str 680 * seq number 681 */ 682 /* 683 * foo bar, I guess I will just free 684 * this new guy, should we abort 685 * too? FIX ME MAYBE? Or it COULD be 686 * that the SSN's have wrapped. 687 * Maybe I should compare to TSN 688 * somehow... sigh for now just blow 689 * away the chunk! 690 */ 691 692 if (control->data) 693 sctp_m_freem(control->data); 694 control->data = NULL; 695 asoc->size_on_all_streams -= control->length; 696 sctp_ucount_decr(asoc->cnt_on_all_streams); 697 if (control->whoFrom) { 698 sctp_free_remote_addr(control->whoFrom); 699 control->whoFrom = NULL; 700 } 701 sctp_free_a_readq(stcb, control); 702 return; 703 } else { 704 if (TAILQ_NEXT(at, next) == NULL) { 705 /* 706 * We are at the end, insert 707 * it after this one 708 */ 709 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { 710 sctp_log_strm_del(control, at, 711 SCTP_STR_LOG_FROM_INSERT_TL); 712 } 713 TAILQ_INSERT_AFTER(&strm->inqueue, 714 at, control, next); 715 break; 716 } 717 } 718 } 719 } 720 } 721 } 722 723 /* 724 * Returns two things: You get the total size of the deliverable parts of the 725 * first fragmented message on the reassembly queue. And you get a 1 back if 726 * all of the message is ready or a 0 back if the message is still incomplete 727 */ 728 static int 729 sctp_is_all_msg_on_reasm(struct sctp_association *asoc, uint32_t * t_size) 730 { 731 struct sctp_tmit_chunk *chk; 732 uint32_t tsn; 733 734 *t_size = 0; 735 chk = TAILQ_FIRST(&asoc->reasmqueue); 736 if (chk == NULL) { 737 /* nothing on the queue */ 738 return (0); 739 } 740 if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0) { 741 /* Not a first on the queue */ 742 return (0); 743 } 744 tsn = chk->rec.data.TSN_seq; 745 TAILQ_FOREACH(chk, &asoc->reasmqueue, sctp_next) { 746 if (tsn != chk->rec.data.TSN_seq) { 747 return (0); 748 } 749 *t_size += chk->send_size; 750 if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) { 751 return (1); 752 } 753 tsn++; 754 } 755 return (0); 756 } 757 758 static void 759 sctp_deliver_reasm_check(struct sctp_tcb *stcb, struct sctp_association *asoc) 760 { 761 struct sctp_tmit_chunk *chk; 762 uint16_t nxt_todel; 763 uint32_t tsize, pd_point; 764 765 doit_again: 766 chk = TAILQ_FIRST(&asoc->reasmqueue); 767 if (chk == NULL) { 768 /* Huh? */ 769 asoc->size_on_reasm_queue = 0; 770 asoc->cnt_on_reasm_queue = 0; 771 return; 772 } 773 if (asoc->fragmented_delivery_inprogress == 0) { 774 nxt_todel = 775 asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered + 1; 776 if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) && 777 (nxt_todel == chk->rec.data.stream_seq || 778 (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED))) { 779 /* 780 * Yep the first one is here and its ok to deliver 781 * but should we? 782 */ 783 if (stcb->sctp_socket) { 784 pd_point = min(SCTP_SB_LIMIT_RCV(stcb->sctp_socket) >> SCTP_PARTIAL_DELIVERY_SHIFT, 785 stcb->sctp_ep->partial_delivery_point); 786 } else { 787 pd_point = stcb->sctp_ep->partial_delivery_point; 788 } 789 if (sctp_is_all_msg_on_reasm(asoc, &tsize) || (tsize >= pd_point)) { 790 /* 791 * Yes, we setup to start reception, by 792 * backing down the TSN just in case we 793 * can't deliver. If we 794 */ 795 asoc->fragmented_delivery_inprogress = 1; 796 asoc->tsn_last_delivered = 797 chk->rec.data.TSN_seq - 1; 798 asoc->str_of_pdapi = 799 chk->rec.data.stream_number; 800 asoc->ssn_of_pdapi = chk->rec.data.stream_seq; 801 asoc->pdapi_ppid = chk->rec.data.payloadtype; 802 asoc->fragment_flags = chk->rec.data.rcv_flags; 803 sctp_service_reassembly(stcb, asoc); 804 } 805 } 806 } else { 807 /* 808 * Service re-assembly will deliver stream data queued at 809 * the end of fragmented delivery.. but it wont know to go 810 * back and call itself again... we do that here with the 811 * got doit_again 812 */ 813 sctp_service_reassembly(stcb, asoc); 814 if (asoc->fragmented_delivery_inprogress == 0) { 815 /* 816 * finished our Fragmented delivery, could be more 817 * waiting? 818 */ 819 goto doit_again; 820 } 821 } 822 } 823 824 /* 825 * Dump onto the re-assembly queue, in its proper place. After dumping on the 826 * queue, see if anthing can be delivered. If so pull it off (or as much as 827 * we can. If we run out of space then we must dump what we can and set the 828 * appropriate flag to say we queued what we could. 829 */ 830 static void 831 sctp_queue_data_for_reasm(struct sctp_tcb *stcb, struct sctp_association *asoc, 832 struct sctp_tmit_chunk *chk, int *abort_flag) 833 { 834 struct mbuf *op_err; 835 char msg[SCTP_DIAG_INFO_LEN]; 836 uint32_t cum_ackp1, prev_tsn, post_tsn; 837 struct sctp_tmit_chunk *at, *prev, *next; 838 839 prev = next = NULL; 840 cum_ackp1 = asoc->tsn_last_delivered + 1; 841 if (TAILQ_EMPTY(&asoc->reasmqueue)) { 842 /* This is the first one on the queue */ 843 TAILQ_INSERT_HEAD(&asoc->reasmqueue, chk, sctp_next); 844 /* 845 * we do not check for delivery of anything when only one 846 * fragment is here 847 */ 848 asoc->size_on_reasm_queue = chk->send_size; 849 sctp_ucount_incr(asoc->cnt_on_reasm_queue); 850 if (chk->rec.data.TSN_seq == cum_ackp1) { 851 if (asoc->fragmented_delivery_inprogress == 0 && 852 (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) != 853 SCTP_DATA_FIRST_FRAG) { 854 /* 855 * An empty queue, no delivery inprogress, 856 * we hit the next one and it does NOT have 857 * a FIRST fragment mark. 858 */ 859 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, its not first, no fragmented delivery in progress\n"); 860 snprintf(msg, sizeof(msg), 861 "Expected B-bit for TSN=%8.8x, SID=%4.4x, SSN=%4.4x", 862 chk->rec.data.TSN_seq, 863 chk->rec.data.stream_number, 864 chk->rec.data.stream_seq); 865 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 866 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_2; 867 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 868 *abort_flag = 1; 869 } else if (asoc->fragmented_delivery_inprogress && 870 (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == SCTP_DATA_FIRST_FRAG) { 871 /* 872 * We are doing a partial delivery and the 873 * NEXT chunk MUST be either the LAST or 874 * MIDDLE fragment NOT a FIRST 875 */ 876 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it IS a first and fragmented delivery in progress\n"); 877 snprintf(msg, sizeof(msg), 878 "Didn't expect B-bit for TSN=%8.8x, SID=%4.4x, SSN=%4.4x", 879 chk->rec.data.TSN_seq, 880 chk->rec.data.stream_number, 881 chk->rec.data.stream_seq); 882 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 883 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_3; 884 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 885 *abort_flag = 1; 886 } else if (asoc->fragmented_delivery_inprogress) { 887 /* 888 * Here we are ok with a MIDDLE or LAST 889 * piece 890 */ 891 if (chk->rec.data.stream_number != 892 asoc->str_of_pdapi) { 893 /* Got to be the right STR No */ 894 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it IS not same stream number %d vs %d\n", 895 chk->rec.data.stream_number, 896 asoc->str_of_pdapi); 897 snprintf(msg, sizeof(msg), 898 "Expected SID=%4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", 899 asoc->str_of_pdapi, 900 chk->rec.data.TSN_seq, 901 chk->rec.data.stream_number, 902 chk->rec.data.stream_seq); 903 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 904 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_4; 905 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 906 *abort_flag = 1; 907 } else if ((asoc->fragment_flags & SCTP_DATA_UNORDERED) != 908 SCTP_DATA_UNORDERED && 909 chk->rec.data.stream_seq != asoc->ssn_of_pdapi) { 910 /* Got to be the right STR Seq */ 911 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it IS not same stream seq %d vs %d\n", 912 chk->rec.data.stream_seq, 913 asoc->ssn_of_pdapi); 914 snprintf(msg, sizeof(msg), 915 "Expected SSN=%4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", 916 asoc->ssn_of_pdapi, 917 chk->rec.data.TSN_seq, 918 chk->rec.data.stream_number, 919 chk->rec.data.stream_seq); 920 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 921 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_5; 922 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 923 *abort_flag = 1; 924 } 925 } 926 } 927 return; 928 } 929 /* Find its place */ 930 TAILQ_FOREACH(at, &asoc->reasmqueue, sctp_next) { 931 if (SCTP_TSN_GT(at->rec.data.TSN_seq, chk->rec.data.TSN_seq)) { 932 /* 933 * one in queue is bigger than the new one, insert 934 * before this one 935 */ 936 /* A check */ 937 asoc->size_on_reasm_queue += chk->send_size; 938 sctp_ucount_incr(asoc->cnt_on_reasm_queue); 939 next = at; 940 TAILQ_INSERT_BEFORE(at, chk, sctp_next); 941 break; 942 } else if (at->rec.data.TSN_seq == chk->rec.data.TSN_seq) { 943 /* Gak, He sent me a duplicate str seq number */ 944 /* 945 * foo bar, I guess I will just free this new guy, 946 * should we abort too? FIX ME MAYBE? Or it COULD be 947 * that the SSN's have wrapped. Maybe I should 948 * compare to TSN somehow... sigh for now just blow 949 * away the chunk! 950 */ 951 if (chk->data) { 952 sctp_m_freem(chk->data); 953 chk->data = NULL; 954 } 955 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 956 return; 957 } else { 958 prev = at; 959 if (TAILQ_NEXT(at, sctp_next) == NULL) { 960 /* 961 * We are at the end, insert it after this 962 * one 963 */ 964 /* check it first */ 965 asoc->size_on_reasm_queue += chk->send_size; 966 sctp_ucount_incr(asoc->cnt_on_reasm_queue); 967 TAILQ_INSERT_AFTER(&asoc->reasmqueue, at, chk, sctp_next); 968 break; 969 } 970 } 971 } 972 /* Now the audits */ 973 if (prev) { 974 prev_tsn = chk->rec.data.TSN_seq - 1; 975 if (prev_tsn == prev->rec.data.TSN_seq) { 976 /* 977 * Ok the one I am dropping onto the end is the 978 * NEXT. A bit of valdiation here. 979 */ 980 if ((prev->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) == 981 SCTP_DATA_FIRST_FRAG || 982 (prev->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) == 983 SCTP_DATA_MIDDLE_FRAG) { 984 /* 985 * Insert chk MUST be a MIDDLE or LAST 986 * fragment 987 */ 988 if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) == 989 SCTP_DATA_FIRST_FRAG) { 990 SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - It can be a midlle or last but not a first\n"); 991 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it's a FIRST!\n"); 992 snprintf(msg, sizeof(msg), 993 "Can't handle B-bit, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", 994 chk->rec.data.TSN_seq, 995 chk->rec.data.stream_number, 996 chk->rec.data.stream_seq); 997 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 998 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_6; 999 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 1000 *abort_flag = 1; 1001 return; 1002 } 1003 if (chk->rec.data.stream_number != 1004 prev->rec.data.stream_number) { 1005 /* 1006 * Huh, need the correct STR here, 1007 * they must be the same. 1008 */ 1009 SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - Gak, Evil plot, sid:%d not the same as at:%d\n", 1010 chk->rec.data.stream_number, 1011 prev->rec.data.stream_number); 1012 snprintf(msg, sizeof(msg), 1013 "Expect SID=%4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", 1014 prev->rec.data.stream_number, 1015 chk->rec.data.TSN_seq, 1016 chk->rec.data.stream_number, 1017 chk->rec.data.stream_seq); 1018 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 1019 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_7; 1020 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 1021 *abort_flag = 1; 1022 return; 1023 } 1024 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) != 1025 (prev->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) { 1026 /* 1027 * Huh, need the same ordering here, 1028 * they must be the same. 1029 */ 1030 SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - Gak, Evil plot, U-bit not constant\n"); 1031 snprintf(msg, sizeof(msg), 1032 "Expect U-bit=%d for TSN=%8.8x, got U-bit=%d", 1033 (prev->rec.data.rcv_flags & SCTP_DATA_UNORDERED) ? 1 : 0, 1034 chk->rec.data.TSN_seq, 1035 (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) ? 1 : 0); 1036 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 1037 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_7; 1038 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 1039 *abort_flag = 1; 1040 return; 1041 } 1042 if ((prev->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0 && 1043 chk->rec.data.stream_seq != 1044 prev->rec.data.stream_seq) { 1045 /* 1046 * Huh, need the correct STR here, 1047 * they must be the same. 1048 */ 1049 SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - Gak, Evil plot, sseq:%d not the same as at:%d\n", 1050 chk->rec.data.stream_seq, 1051 prev->rec.data.stream_seq); 1052 snprintf(msg, sizeof(msg), 1053 "Expect SSN=%4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", 1054 prev->rec.data.stream_seq, 1055 chk->rec.data.TSN_seq, 1056 chk->rec.data.stream_number, 1057 chk->rec.data.stream_seq); 1058 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 1059 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_8; 1060 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 1061 *abort_flag = 1; 1062 return; 1063 } 1064 } else if ((prev->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) == 1065 SCTP_DATA_LAST_FRAG) { 1066 /* Insert chk MUST be a FIRST */ 1067 if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) != 1068 SCTP_DATA_FIRST_FRAG) { 1069 SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - Gak, evil plot, its not FIRST and it must be!\n"); 1070 snprintf(msg, sizeof(msg), 1071 "Expect B-bit, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", 1072 chk->rec.data.TSN_seq, 1073 chk->rec.data.stream_number, 1074 chk->rec.data.stream_seq); 1075 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 1076 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_9; 1077 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 1078 *abort_flag = 1; 1079 return; 1080 } 1081 } 1082 } 1083 } 1084 if (next) { 1085 post_tsn = chk->rec.data.TSN_seq + 1; 1086 if (post_tsn == next->rec.data.TSN_seq) { 1087 /* 1088 * Ok the one I am inserting ahead of is my NEXT 1089 * one. A bit of valdiation here. 1090 */ 1091 if (next->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) { 1092 /* Insert chk MUST be a last fragment */ 1093 if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) 1094 != SCTP_DATA_LAST_FRAG) { 1095 SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Next is FIRST, we must be LAST\n"); 1096 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, its not a last!\n"); 1097 snprintf(msg, sizeof(msg), 1098 "Expect only E-bit, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", 1099 chk->rec.data.TSN_seq, 1100 chk->rec.data.stream_number, 1101 chk->rec.data.stream_seq); 1102 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 1103 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_10; 1104 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 1105 *abort_flag = 1; 1106 return; 1107 } 1108 } else if ((next->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) == 1109 SCTP_DATA_MIDDLE_FRAG || 1110 (next->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) == 1111 SCTP_DATA_LAST_FRAG) { 1112 /* 1113 * Insert chk CAN be MIDDLE or FIRST NOT 1114 * LAST 1115 */ 1116 if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) == 1117 SCTP_DATA_LAST_FRAG) { 1118 SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Next is a MIDDLE/LAST\n"); 1119 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, new prev chunk is a LAST\n"); 1120 snprintf(msg, sizeof(msg), 1121 "Didn't expect E-bit, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", 1122 chk->rec.data.TSN_seq, 1123 chk->rec.data.stream_number, 1124 chk->rec.data.stream_seq); 1125 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 1126 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_11; 1127 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 1128 *abort_flag = 1; 1129 return; 1130 } 1131 if (chk->rec.data.stream_number != 1132 next->rec.data.stream_number) { 1133 /* 1134 * Huh, need the correct STR here, 1135 * they must be the same. 1136 */ 1137 SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Gak, Evil plot, ssn:%d not the same as at:%d\n", 1138 chk->rec.data.stream_number, 1139 next->rec.data.stream_number); 1140 snprintf(msg, sizeof(msg), 1141 "Required SID %4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", 1142 next->rec.data.stream_number, 1143 chk->rec.data.TSN_seq, 1144 chk->rec.data.stream_number, 1145 chk->rec.data.stream_seq); 1146 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 1147 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_12; 1148 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 1149 *abort_flag = 1; 1150 return; 1151 } 1152 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) != 1153 (next->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) { 1154 /* 1155 * Huh, need the same ordering here, 1156 * they must be the same. 1157 */ 1158 SCTPDBG(SCTP_DEBUG_INDATA1, "Next check - Gak, Evil plot, U-bit not constant\n"); 1159 snprintf(msg, sizeof(msg), 1160 "Expect U-bit=%d for TSN=%8.8x, got U-bit=%d", 1161 (next->rec.data.rcv_flags & SCTP_DATA_UNORDERED) ? 1 : 0, 1162 chk->rec.data.TSN_seq, 1163 (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) ? 1 : 0); 1164 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 1165 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_12; 1166 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 1167 *abort_flag = 1; 1168 return; 1169 } 1170 if ((next->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0 && 1171 chk->rec.data.stream_seq != 1172 next->rec.data.stream_seq) { 1173 /* 1174 * Huh, need the correct STR here, 1175 * they must be the same. 1176 */ 1177 SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Gak, Evil plot, sseq:%d not the same as at:%d\n", 1178 chk->rec.data.stream_seq, 1179 next->rec.data.stream_seq); 1180 snprintf(msg, sizeof(msg), 1181 "Required SSN %4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", 1182 next->rec.data.stream_seq, 1183 chk->rec.data.TSN_seq, 1184 chk->rec.data.stream_number, 1185 chk->rec.data.stream_seq); 1186 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 1187 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_13; 1188 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 1189 *abort_flag = 1; 1190 return; 1191 } 1192 } 1193 } 1194 } 1195 /* Do we need to do some delivery? check */ 1196 sctp_deliver_reasm_check(stcb, asoc); 1197 } 1198 1199 /* 1200 * This is an unfortunate routine. It checks to make sure a evil guy is not 1201 * stuffing us full of bad packet fragments. A broken peer could also do this 1202 * but this is doubtful. It is to bad I must worry about evil crackers sigh 1203 * :< more cycles. 1204 */ 1205 static int 1206 sctp_does_tsn_belong_to_reasm(struct sctp_association *asoc, 1207 uint32_t TSN_seq) 1208 { 1209 struct sctp_tmit_chunk *at; 1210 uint32_t tsn_est; 1211 1212 TAILQ_FOREACH(at, &asoc->reasmqueue, sctp_next) { 1213 if (SCTP_TSN_GT(TSN_seq, at->rec.data.TSN_seq)) { 1214 /* is it one bigger? */ 1215 tsn_est = at->rec.data.TSN_seq + 1; 1216 if (tsn_est == TSN_seq) { 1217 /* yep. It better be a last then */ 1218 if ((at->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) != 1219 SCTP_DATA_LAST_FRAG) { 1220 /* 1221 * Ok this guy belongs next to a guy 1222 * that is NOT last, it should be a 1223 * middle/last, not a complete 1224 * chunk. 1225 */ 1226 return (1); 1227 } else { 1228 /* 1229 * This guy is ok since its a LAST 1230 * and the new chunk is a fully 1231 * self- contained one. 1232 */ 1233 return (0); 1234 } 1235 } 1236 } else if (TSN_seq == at->rec.data.TSN_seq) { 1237 /* Software error since I have a dup? */ 1238 return (1); 1239 } else { 1240 /* 1241 * Ok, 'at' is larger than new chunk but does it 1242 * need to be right before it. 1243 */ 1244 tsn_est = TSN_seq + 1; 1245 if (tsn_est == at->rec.data.TSN_seq) { 1246 /* Yep, It better be a first */ 1247 if ((at->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) != 1248 SCTP_DATA_FIRST_FRAG) { 1249 return (1); 1250 } else { 1251 return (0); 1252 } 1253 } 1254 } 1255 } 1256 return (0); 1257 } 1258 1259 static int 1260 sctp_process_a_data_chunk(struct sctp_tcb *stcb, struct sctp_association *asoc, 1261 struct mbuf **m, int offset, struct sctp_data_chunk *ch, int chk_length, 1262 struct sctp_nets *net, uint32_t * high_tsn, int *abort_flag, 1263 int *break_flag, int last_chunk) 1264 { 1265 /* Process a data chunk */ 1266 /* struct sctp_tmit_chunk *chk; */ 1267 struct sctp_tmit_chunk *chk; 1268 uint32_t tsn, gap; 1269 struct mbuf *dmbuf; 1270 int the_len; 1271 int need_reasm_check = 0; 1272 uint16_t strmno, strmseq; 1273 struct mbuf *op_err; 1274 char msg[SCTP_DIAG_INFO_LEN]; 1275 struct sctp_queued_to_read *control; 1276 int ordered; 1277 uint32_t protocol_id; 1278 uint8_t chunk_flags; 1279 struct sctp_stream_reset_list *liste; 1280 1281 chk = NULL; 1282 tsn = ntohl(ch->dp.tsn); 1283 chunk_flags = ch->ch.chunk_flags; 1284 if ((chunk_flags & SCTP_DATA_SACK_IMMEDIATELY) == SCTP_DATA_SACK_IMMEDIATELY) { 1285 asoc->send_sack = 1; 1286 } 1287 protocol_id = ch->dp.protocol_id; 1288 ordered = ((chunk_flags & SCTP_DATA_UNORDERED) == 0); 1289 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 1290 sctp_log_map(tsn, asoc->cumulative_tsn, asoc->highest_tsn_inside_map, SCTP_MAP_TSN_ENTERS); 1291 } 1292 if (stcb == NULL) { 1293 return (0); 1294 } 1295 SCTP_LTRACE_CHK(stcb->sctp_ep, stcb, ch->ch.chunk_type, tsn); 1296 if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 1297 /* It is a duplicate */ 1298 SCTP_STAT_INCR(sctps_recvdupdata); 1299 if (asoc->numduptsns < SCTP_MAX_DUP_TSNS) { 1300 /* Record a dup for the next outbound sack */ 1301 asoc->dup_tsns[asoc->numduptsns] = tsn; 1302 asoc->numduptsns++; 1303 } 1304 asoc->send_sack = 1; 1305 return (0); 1306 } 1307 /* Calculate the number of TSN's between the base and this TSN */ 1308 SCTP_CALC_TSN_TO_GAP(gap, tsn, asoc->mapping_array_base_tsn); 1309 if (gap >= (SCTP_MAPPING_ARRAY << 3)) { 1310 /* Can't hold the bit in the mapping at max array, toss it */ 1311 return (0); 1312 } 1313 if (gap >= (uint32_t) (asoc->mapping_array_size << 3)) { 1314 SCTP_TCB_LOCK_ASSERT(stcb); 1315 if (sctp_expand_mapping_array(asoc, gap)) { 1316 /* Can't expand, drop it */ 1317 return (0); 1318 } 1319 } 1320 if (SCTP_TSN_GT(tsn, *high_tsn)) { 1321 *high_tsn = tsn; 1322 } 1323 /* See if we have received this one already */ 1324 if (SCTP_IS_TSN_PRESENT(asoc->mapping_array, gap) || 1325 SCTP_IS_TSN_PRESENT(asoc->nr_mapping_array, gap)) { 1326 SCTP_STAT_INCR(sctps_recvdupdata); 1327 if (asoc->numduptsns < SCTP_MAX_DUP_TSNS) { 1328 /* Record a dup for the next outbound sack */ 1329 asoc->dup_tsns[asoc->numduptsns] = tsn; 1330 asoc->numduptsns++; 1331 } 1332 asoc->send_sack = 1; 1333 return (0); 1334 } 1335 /* 1336 * Check to see about the GONE flag, duplicates would cause a sack 1337 * to be sent up above 1338 */ 1339 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 1340 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || 1341 (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET))) { 1342 /* 1343 * wait a minute, this guy is gone, there is no longer a 1344 * receiver. Send peer an ABORT! 1345 */ 1346 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 1347 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 1348 *abort_flag = 1; 1349 return (0); 1350 } 1351 /* 1352 * Now before going further we see if there is room. If NOT then we 1353 * MAY let one through only IF this TSN is the one we are waiting 1354 * for on a partial delivery API. 1355 */ 1356 1357 /* now do the tests */ 1358 if (((asoc->cnt_on_all_streams + 1359 asoc->cnt_on_reasm_queue + 1360 asoc->cnt_msg_on_sb) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue)) || 1361 (((int)asoc->my_rwnd) <= 0)) { 1362 /* 1363 * When we have NO room in the rwnd we check to make sure 1364 * the reader is doing its job... 1365 */ 1366 if (stcb->sctp_socket->so_rcv.sb_cc) { 1367 /* some to read, wake-up */ 1368 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1369 struct socket *so; 1370 1371 so = SCTP_INP_SO(stcb->sctp_ep); 1372 atomic_add_int(&stcb->asoc.refcnt, 1); 1373 SCTP_TCB_UNLOCK(stcb); 1374 SCTP_SOCKET_LOCK(so, 1); 1375 SCTP_TCB_LOCK(stcb); 1376 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1377 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1378 /* assoc was freed while we were unlocked */ 1379 SCTP_SOCKET_UNLOCK(so, 1); 1380 return (0); 1381 } 1382 #endif 1383 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 1384 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1385 SCTP_SOCKET_UNLOCK(so, 1); 1386 #endif 1387 } 1388 /* now is it in the mapping array of what we have accepted? */ 1389 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_map) && 1390 SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) { 1391 /* Nope not in the valid range dump it */ 1392 sctp_set_rwnd(stcb, asoc); 1393 if ((asoc->cnt_on_all_streams + 1394 asoc->cnt_on_reasm_queue + 1395 asoc->cnt_msg_on_sb) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue)) { 1396 SCTP_STAT_INCR(sctps_datadropchklmt); 1397 } else { 1398 SCTP_STAT_INCR(sctps_datadroprwnd); 1399 } 1400 *break_flag = 1; 1401 return (0); 1402 } 1403 } 1404 strmno = ntohs(ch->dp.stream_id); 1405 if (strmno >= asoc->streamincnt) { 1406 struct sctp_paramhdr *phdr; 1407 struct mbuf *mb; 1408 1409 mb = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) * 2), 1410 0, M_NOWAIT, 1, MT_DATA); 1411 if (mb != NULL) { 1412 /* add some space up front so prepend will work well */ 1413 SCTP_BUF_RESV_UF(mb, sizeof(struct sctp_chunkhdr)); 1414 phdr = mtod(mb, struct sctp_paramhdr *); 1415 /* 1416 * Error causes are just param's and this one has 1417 * two back to back phdr, one with the error type 1418 * and size, the other with the streamid and a rsvd 1419 */ 1420 SCTP_BUF_LEN(mb) = (sizeof(struct sctp_paramhdr) * 2); 1421 phdr->param_type = htons(SCTP_CAUSE_INVALID_STREAM); 1422 phdr->param_length = 1423 htons(sizeof(struct sctp_paramhdr) * 2); 1424 phdr++; 1425 /* We insert the stream in the type field */ 1426 phdr->param_type = ch->dp.stream_id; 1427 /* And set the length to 0 for the rsvd field */ 1428 phdr->param_length = 0; 1429 sctp_queue_op_err(stcb, mb); 1430 } 1431 SCTP_STAT_INCR(sctps_badsid); 1432 SCTP_TCB_LOCK_ASSERT(stcb); 1433 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap); 1434 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) { 1435 asoc->highest_tsn_inside_nr_map = tsn; 1436 } 1437 if (tsn == (asoc->cumulative_tsn + 1)) { 1438 /* Update cum-ack */ 1439 asoc->cumulative_tsn = tsn; 1440 } 1441 return (0); 1442 } 1443 /* 1444 * Before we continue lets validate that we are not being fooled by 1445 * an evil attacker. We can only have 4k chunks based on our TSN 1446 * spread allowed by the mapping array 512 * 8 bits, so there is no 1447 * way our stream sequence numbers could have wrapped. We of course 1448 * only validate the FIRST fragment so the bit must be set. 1449 */ 1450 strmseq = ntohs(ch->dp.stream_sequence); 1451 #ifdef SCTP_ASOCLOG_OF_TSNS 1452 SCTP_TCB_LOCK_ASSERT(stcb); 1453 if (asoc->tsn_in_at >= SCTP_TSN_LOG_SIZE) { 1454 asoc->tsn_in_at = 0; 1455 asoc->tsn_in_wrapped = 1; 1456 } 1457 asoc->in_tsnlog[asoc->tsn_in_at].tsn = tsn; 1458 asoc->in_tsnlog[asoc->tsn_in_at].strm = strmno; 1459 asoc->in_tsnlog[asoc->tsn_in_at].seq = strmseq; 1460 asoc->in_tsnlog[asoc->tsn_in_at].sz = chk_length; 1461 asoc->in_tsnlog[asoc->tsn_in_at].flgs = chunk_flags; 1462 asoc->in_tsnlog[asoc->tsn_in_at].stcb = (void *)stcb; 1463 asoc->in_tsnlog[asoc->tsn_in_at].in_pos = asoc->tsn_in_at; 1464 asoc->in_tsnlog[asoc->tsn_in_at].in_out = 1; 1465 asoc->tsn_in_at++; 1466 #endif 1467 if ((chunk_flags & SCTP_DATA_FIRST_FRAG) && 1468 (TAILQ_EMPTY(&asoc->resetHead)) && 1469 (chunk_flags & SCTP_DATA_UNORDERED) == 0 && 1470 SCTP_SSN_GE(asoc->strmin[strmno].last_sequence_delivered, strmseq)) { 1471 /* The incoming sseq is behind where we last delivered? */ 1472 SCTPDBG(SCTP_DEBUG_INDATA1, "EVIL/Broken-Dup S-SEQ:%d delivered:%d from peer, Abort!\n", 1473 strmseq, asoc->strmin[strmno].last_sequence_delivered); 1474 1475 snprintf(msg, sizeof(msg), "Delivered SSN=%4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", 1476 asoc->strmin[strmno].last_sequence_delivered, 1477 tsn, strmno, strmseq); 1478 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 1479 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_14; 1480 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 1481 *abort_flag = 1; 1482 return (0); 1483 } 1484 /************************************ 1485 * From here down we may find ch-> invalid 1486 * so its a good idea NOT to use it. 1487 *************************************/ 1488 1489 the_len = (chk_length - sizeof(struct sctp_data_chunk)); 1490 if (last_chunk == 0) { 1491 dmbuf = SCTP_M_COPYM(*m, 1492 (offset + sizeof(struct sctp_data_chunk)), 1493 the_len, M_NOWAIT); 1494 #ifdef SCTP_MBUF_LOGGING 1495 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 1496 sctp_log_mbc(dmbuf, SCTP_MBUF_ICOPY); 1497 } 1498 #endif 1499 } else { 1500 /* We can steal the last chunk */ 1501 int l_len; 1502 1503 dmbuf = *m; 1504 /* lop off the top part */ 1505 m_adj(dmbuf, (offset + sizeof(struct sctp_data_chunk))); 1506 if (SCTP_BUF_NEXT(dmbuf) == NULL) { 1507 l_len = SCTP_BUF_LEN(dmbuf); 1508 } else { 1509 /* 1510 * need to count up the size hopefully does not hit 1511 * this to often :-0 1512 */ 1513 struct mbuf *lat; 1514 1515 l_len = 0; 1516 for (lat = dmbuf; lat; lat = SCTP_BUF_NEXT(lat)) { 1517 l_len += SCTP_BUF_LEN(lat); 1518 } 1519 } 1520 if (l_len > the_len) { 1521 /* Trim the end round bytes off too */ 1522 m_adj(dmbuf, -(l_len - the_len)); 1523 } 1524 } 1525 if (dmbuf == NULL) { 1526 SCTP_STAT_INCR(sctps_nomem); 1527 return (0); 1528 } 1529 if ((chunk_flags & SCTP_DATA_NOT_FRAG) == SCTP_DATA_NOT_FRAG && 1530 asoc->fragmented_delivery_inprogress == 0 && 1531 TAILQ_EMPTY(&asoc->resetHead) && 1532 ((ordered == 0) || 1533 ((uint16_t) (asoc->strmin[strmno].last_sequence_delivered + 1) == strmseq && 1534 TAILQ_EMPTY(&asoc->strmin[strmno].inqueue)))) { 1535 /* Candidate for express delivery */ 1536 /* 1537 * Its not fragmented, No PD-API is up, Nothing in the 1538 * delivery queue, Its un-ordered OR ordered and the next to 1539 * deliver AND nothing else is stuck on the stream queue, 1540 * And there is room for it in the socket buffer. Lets just 1541 * stuff it up the buffer.... 1542 */ 1543 1544 /* It would be nice to avoid this copy if we could :< */ 1545 sctp_alloc_a_readq(stcb, control); 1546 sctp_build_readq_entry_mac(control, stcb, asoc->context, net, tsn, 1547 protocol_id, 1548 strmno, strmseq, 1549 chunk_flags, 1550 dmbuf); 1551 if (control == NULL) { 1552 goto failed_express_del; 1553 } 1554 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap); 1555 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) { 1556 asoc->highest_tsn_inside_nr_map = tsn; 1557 } 1558 sctp_add_to_readq(stcb->sctp_ep, stcb, 1559 control, &stcb->sctp_socket->so_rcv, 1560 1, SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED); 1561 1562 if ((chunk_flags & SCTP_DATA_UNORDERED) == 0) { 1563 /* for ordered, bump what we delivered */ 1564 asoc->strmin[strmno].last_sequence_delivered++; 1565 } 1566 SCTP_STAT_INCR(sctps_recvexpress); 1567 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { 1568 sctp_log_strm_del_alt(stcb, tsn, strmseq, strmno, 1569 SCTP_STR_LOG_FROM_EXPRS_DEL); 1570 } 1571 control = NULL; 1572 1573 goto finish_express_del; 1574 } 1575 failed_express_del: 1576 /* If we reach here this is a new chunk */ 1577 chk = NULL; 1578 control = NULL; 1579 /* Express for fragmented delivery? */ 1580 if ((asoc->fragmented_delivery_inprogress) && 1581 (stcb->asoc.control_pdapi) && 1582 (asoc->str_of_pdapi == strmno) && 1583 (asoc->ssn_of_pdapi == strmseq) 1584 ) { 1585 control = stcb->asoc.control_pdapi; 1586 if ((chunk_flags & SCTP_DATA_FIRST_FRAG) == SCTP_DATA_FIRST_FRAG) { 1587 /* Can't be another first? */ 1588 goto failed_pdapi_express_del; 1589 } 1590 if (tsn == (control->sinfo_tsn + 1)) { 1591 /* Yep, we can add it on */ 1592 int end = 0; 1593 1594 if (chunk_flags & SCTP_DATA_LAST_FRAG) { 1595 end = 1; 1596 } 1597 if (sctp_append_to_readq(stcb->sctp_ep, stcb, control, dmbuf, end, 1598 tsn, 1599 &stcb->sctp_socket->so_rcv)) { 1600 SCTP_PRINTF("Append fails end:%d\n", end); 1601 goto failed_pdapi_express_del; 1602 } 1603 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap); 1604 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) { 1605 asoc->highest_tsn_inside_nr_map = tsn; 1606 } 1607 SCTP_STAT_INCR(sctps_recvexpressm); 1608 asoc->tsn_last_delivered = tsn; 1609 asoc->fragment_flags = chunk_flags; 1610 asoc->tsn_of_pdapi_last_delivered = tsn; 1611 asoc->last_flags_delivered = chunk_flags; 1612 asoc->last_strm_seq_delivered = strmseq; 1613 asoc->last_strm_no_delivered = strmno; 1614 if (end) { 1615 /* clean up the flags and such */ 1616 asoc->fragmented_delivery_inprogress = 0; 1617 if ((chunk_flags & SCTP_DATA_UNORDERED) == 0) { 1618 asoc->strmin[strmno].last_sequence_delivered++; 1619 } 1620 stcb->asoc.control_pdapi = NULL; 1621 if (TAILQ_EMPTY(&asoc->reasmqueue) == 0) { 1622 /* 1623 * There could be another message 1624 * ready 1625 */ 1626 need_reasm_check = 1; 1627 } 1628 } 1629 control = NULL; 1630 goto finish_express_del; 1631 } 1632 } 1633 failed_pdapi_express_del: 1634 control = NULL; 1635 if (SCTP_BASE_SYSCTL(sctp_do_drain) == 0) { 1636 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap); 1637 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) { 1638 asoc->highest_tsn_inside_nr_map = tsn; 1639 } 1640 } else { 1641 SCTP_SET_TSN_PRESENT(asoc->mapping_array, gap); 1642 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_map)) { 1643 asoc->highest_tsn_inside_map = tsn; 1644 } 1645 } 1646 if ((chunk_flags & SCTP_DATA_NOT_FRAG) != SCTP_DATA_NOT_FRAG) { 1647 sctp_alloc_a_chunk(stcb, chk); 1648 if (chk == NULL) { 1649 /* No memory so we drop the chunk */ 1650 SCTP_STAT_INCR(sctps_nomem); 1651 if (last_chunk == 0) { 1652 /* we copied it, free the copy */ 1653 sctp_m_freem(dmbuf); 1654 } 1655 return (0); 1656 } 1657 chk->rec.data.TSN_seq = tsn; 1658 chk->no_fr_allowed = 0; 1659 chk->rec.data.stream_seq = strmseq; 1660 chk->rec.data.stream_number = strmno; 1661 chk->rec.data.payloadtype = protocol_id; 1662 chk->rec.data.context = stcb->asoc.context; 1663 chk->rec.data.doing_fast_retransmit = 0; 1664 chk->rec.data.rcv_flags = chunk_flags; 1665 chk->asoc = asoc; 1666 chk->send_size = the_len; 1667 chk->whoTo = net; 1668 atomic_add_int(&net->ref_count, 1); 1669 chk->data = dmbuf; 1670 } else { 1671 sctp_alloc_a_readq(stcb, control); 1672 sctp_build_readq_entry_mac(control, stcb, asoc->context, net, tsn, 1673 protocol_id, 1674 strmno, strmseq, 1675 chunk_flags, 1676 dmbuf); 1677 if (control == NULL) { 1678 /* No memory so we drop the chunk */ 1679 SCTP_STAT_INCR(sctps_nomem); 1680 if (last_chunk == 0) { 1681 /* we copied it, free the copy */ 1682 sctp_m_freem(dmbuf); 1683 } 1684 return (0); 1685 } 1686 control->length = the_len; 1687 } 1688 1689 /* Mark it as received */ 1690 /* Now queue it where it belongs */ 1691 if (control != NULL) { 1692 /* First a sanity check */ 1693 if (asoc->fragmented_delivery_inprogress) { 1694 /* 1695 * Ok, we have a fragmented delivery in progress if 1696 * this chunk is next to deliver OR belongs in our 1697 * view to the reassembly, the peer is evil or 1698 * broken. 1699 */ 1700 uint32_t estimate_tsn; 1701 1702 estimate_tsn = asoc->tsn_last_delivered + 1; 1703 if (TAILQ_EMPTY(&asoc->reasmqueue) && 1704 (estimate_tsn == control->sinfo_tsn)) { 1705 /* Evil/Broke peer */ 1706 sctp_m_freem(control->data); 1707 control->data = NULL; 1708 if (control->whoFrom) { 1709 sctp_free_remote_addr(control->whoFrom); 1710 control->whoFrom = NULL; 1711 } 1712 sctp_free_a_readq(stcb, control); 1713 snprintf(msg, sizeof(msg), "Reas. queue emtpy, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", 1714 tsn, strmno, strmseq); 1715 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 1716 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_15; 1717 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 1718 *abort_flag = 1; 1719 if (last_chunk) { 1720 *m = NULL; 1721 } 1722 return (0); 1723 } else { 1724 if (sctp_does_tsn_belong_to_reasm(asoc, control->sinfo_tsn)) { 1725 sctp_m_freem(control->data); 1726 control->data = NULL; 1727 if (control->whoFrom) { 1728 sctp_free_remote_addr(control->whoFrom); 1729 control->whoFrom = NULL; 1730 } 1731 sctp_free_a_readq(stcb, control); 1732 snprintf(msg, sizeof(msg), "PD ongoing, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", 1733 tsn, strmno, strmseq); 1734 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 1735 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_16; 1736 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 1737 *abort_flag = 1; 1738 if (last_chunk) { 1739 *m = NULL; 1740 } 1741 return (0); 1742 } 1743 } 1744 } else { 1745 /* No PDAPI running */ 1746 if (!TAILQ_EMPTY(&asoc->reasmqueue)) { 1747 /* 1748 * Reassembly queue is NOT empty validate 1749 * that this tsn does not need to be in 1750 * reasembly queue. If it does then our peer 1751 * is broken or evil. 1752 */ 1753 if (sctp_does_tsn_belong_to_reasm(asoc, control->sinfo_tsn)) { 1754 sctp_m_freem(control->data); 1755 control->data = NULL; 1756 if (control->whoFrom) { 1757 sctp_free_remote_addr(control->whoFrom); 1758 control->whoFrom = NULL; 1759 } 1760 sctp_free_a_readq(stcb, control); 1761 snprintf(msg, sizeof(msg), "No PD ongoing, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x", 1762 tsn, strmno, strmseq); 1763 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 1764 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_17; 1765 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 1766 *abort_flag = 1; 1767 if (last_chunk) { 1768 *m = NULL; 1769 } 1770 return (0); 1771 } 1772 } 1773 } 1774 /* ok, if we reach here we have passed the sanity checks */ 1775 if (chunk_flags & SCTP_DATA_UNORDERED) { 1776 /* queue directly into socket buffer */ 1777 sctp_mark_non_revokable(asoc, control->sinfo_tsn); 1778 sctp_add_to_readq(stcb->sctp_ep, stcb, 1779 control, 1780 &stcb->sctp_socket->so_rcv, 1, SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED); 1781 } else { 1782 /* 1783 * Special check for when streams are resetting. We 1784 * could be more smart about this and check the 1785 * actual stream to see if it is not being reset.. 1786 * that way we would not create a HOLB when amongst 1787 * streams being reset and those not being reset. 1788 * 1789 * We take complete messages that have a stream reset 1790 * intervening (aka the TSN is after where our 1791 * cum-ack needs to be) off and put them on a 1792 * pending_reply_queue. The reassembly ones we do 1793 * not have to worry about since they are all sorted 1794 * and proceessed by TSN order. It is only the 1795 * singletons I must worry about. 1796 */ 1797 if (((liste = TAILQ_FIRST(&asoc->resetHead)) != NULL) && 1798 SCTP_TSN_GT(tsn, liste->tsn)) { 1799 /* 1800 * yep its past where we need to reset... go 1801 * ahead and queue it. 1802 */ 1803 if (TAILQ_EMPTY(&asoc->pending_reply_queue)) { 1804 /* first one on */ 1805 TAILQ_INSERT_TAIL(&asoc->pending_reply_queue, control, next); 1806 } else { 1807 struct sctp_queued_to_read *ctlOn, 1808 *nctlOn; 1809 unsigned char inserted = 0; 1810 1811 TAILQ_FOREACH_SAFE(ctlOn, &asoc->pending_reply_queue, next, nctlOn) { 1812 if (SCTP_TSN_GT(control->sinfo_tsn, ctlOn->sinfo_tsn)) { 1813 continue; 1814 } else { 1815 /* found it */ 1816 TAILQ_INSERT_BEFORE(ctlOn, control, next); 1817 inserted = 1; 1818 break; 1819 } 1820 } 1821 if (inserted == 0) { 1822 /* 1823 * must be put at end, use 1824 * prevP (all setup from 1825 * loop) to setup nextP. 1826 */ 1827 TAILQ_INSERT_TAIL(&asoc->pending_reply_queue, control, next); 1828 } 1829 } 1830 } else { 1831 sctp_queue_data_to_stream(stcb, asoc, control, abort_flag); 1832 if (*abort_flag) { 1833 if (last_chunk) { 1834 *m = NULL; 1835 } 1836 return (0); 1837 } 1838 } 1839 } 1840 } else { 1841 /* Into the re-assembly queue */ 1842 sctp_queue_data_for_reasm(stcb, asoc, chk, abort_flag); 1843 if (*abort_flag) { 1844 /* 1845 * the assoc is now gone and chk was put onto the 1846 * reasm queue, which has all been freed. 1847 */ 1848 if (last_chunk) { 1849 *m = NULL; 1850 } 1851 return (0); 1852 } 1853 } 1854 finish_express_del: 1855 if (tsn == (asoc->cumulative_tsn + 1)) { 1856 /* Update cum-ack */ 1857 asoc->cumulative_tsn = tsn; 1858 } 1859 if (last_chunk) { 1860 *m = NULL; 1861 } 1862 if (ordered) { 1863 SCTP_STAT_INCR_COUNTER64(sctps_inorderchunks); 1864 } else { 1865 SCTP_STAT_INCR_COUNTER64(sctps_inunorderchunks); 1866 } 1867 SCTP_STAT_INCR(sctps_recvdata); 1868 /* Set it present please */ 1869 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { 1870 sctp_log_strm_del_alt(stcb, tsn, strmseq, strmno, SCTP_STR_LOG_FROM_MARK_TSN); 1871 } 1872 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 1873 sctp_log_map(asoc->mapping_array_base_tsn, asoc->cumulative_tsn, 1874 asoc->highest_tsn_inside_map, SCTP_MAP_PREPARE_SLIDE); 1875 } 1876 /* check the special flag for stream resets */ 1877 if (((liste = TAILQ_FIRST(&asoc->resetHead)) != NULL) && 1878 SCTP_TSN_GE(asoc->cumulative_tsn, liste->tsn)) { 1879 /* 1880 * we have finished working through the backlogged TSN's now 1881 * time to reset streams. 1: call reset function. 2: free 1882 * pending_reply space 3: distribute any chunks in 1883 * pending_reply_queue. 1884 */ 1885 struct sctp_queued_to_read *ctl, *nctl; 1886 1887 sctp_reset_in_stream(stcb, liste->number_entries, liste->list_of_streams); 1888 TAILQ_REMOVE(&asoc->resetHead, liste, next_resp); 1889 SCTP_FREE(liste, SCTP_M_STRESET); 1890 /* sa_ignore FREED_MEMORY */ 1891 liste = TAILQ_FIRST(&asoc->resetHead); 1892 if (TAILQ_EMPTY(&asoc->resetHead)) { 1893 /* All can be removed */ 1894 TAILQ_FOREACH_SAFE(ctl, &asoc->pending_reply_queue, next, nctl) { 1895 TAILQ_REMOVE(&asoc->pending_reply_queue, ctl, next); 1896 sctp_queue_data_to_stream(stcb, asoc, ctl, abort_flag); 1897 if (*abort_flag) { 1898 return (0); 1899 } 1900 } 1901 } else { 1902 TAILQ_FOREACH_SAFE(ctl, &asoc->pending_reply_queue, next, nctl) { 1903 if (SCTP_TSN_GT(ctl->sinfo_tsn, liste->tsn)) { 1904 break; 1905 } 1906 /* 1907 * if ctl->sinfo_tsn is <= liste->tsn we can 1908 * process it which is the NOT of 1909 * ctl->sinfo_tsn > liste->tsn 1910 */ 1911 TAILQ_REMOVE(&asoc->pending_reply_queue, ctl, next); 1912 sctp_queue_data_to_stream(stcb, asoc, ctl, abort_flag); 1913 if (*abort_flag) { 1914 return (0); 1915 } 1916 } 1917 } 1918 /* 1919 * Now service re-assembly to pick up anything that has been 1920 * held on reassembly queue? 1921 */ 1922 sctp_deliver_reasm_check(stcb, asoc); 1923 need_reasm_check = 0; 1924 } 1925 if (need_reasm_check) { 1926 /* Another one waits ? */ 1927 sctp_deliver_reasm_check(stcb, asoc); 1928 } 1929 return (1); 1930 } 1931 1932 int8_t sctp_map_lookup_tab[256] = { 1933 0, 1, 0, 2, 0, 1, 0, 3, 1934 0, 1, 0, 2, 0, 1, 0, 4, 1935 0, 1, 0, 2, 0, 1, 0, 3, 1936 0, 1, 0, 2, 0, 1, 0, 5, 1937 0, 1, 0, 2, 0, 1, 0, 3, 1938 0, 1, 0, 2, 0, 1, 0, 4, 1939 0, 1, 0, 2, 0, 1, 0, 3, 1940 0, 1, 0, 2, 0, 1, 0, 6, 1941 0, 1, 0, 2, 0, 1, 0, 3, 1942 0, 1, 0, 2, 0, 1, 0, 4, 1943 0, 1, 0, 2, 0, 1, 0, 3, 1944 0, 1, 0, 2, 0, 1, 0, 5, 1945 0, 1, 0, 2, 0, 1, 0, 3, 1946 0, 1, 0, 2, 0, 1, 0, 4, 1947 0, 1, 0, 2, 0, 1, 0, 3, 1948 0, 1, 0, 2, 0, 1, 0, 7, 1949 0, 1, 0, 2, 0, 1, 0, 3, 1950 0, 1, 0, 2, 0, 1, 0, 4, 1951 0, 1, 0, 2, 0, 1, 0, 3, 1952 0, 1, 0, 2, 0, 1, 0, 5, 1953 0, 1, 0, 2, 0, 1, 0, 3, 1954 0, 1, 0, 2, 0, 1, 0, 4, 1955 0, 1, 0, 2, 0, 1, 0, 3, 1956 0, 1, 0, 2, 0, 1, 0, 6, 1957 0, 1, 0, 2, 0, 1, 0, 3, 1958 0, 1, 0, 2, 0, 1, 0, 4, 1959 0, 1, 0, 2, 0, 1, 0, 3, 1960 0, 1, 0, 2, 0, 1, 0, 5, 1961 0, 1, 0, 2, 0, 1, 0, 3, 1962 0, 1, 0, 2, 0, 1, 0, 4, 1963 0, 1, 0, 2, 0, 1, 0, 3, 1964 0, 1, 0, 2, 0, 1, 0, 8 1965 }; 1966 1967 1968 void 1969 sctp_slide_mapping_arrays(struct sctp_tcb *stcb) 1970 { 1971 /* 1972 * Now we also need to check the mapping array in a couple of ways. 1973 * 1) Did we move the cum-ack point? 1974 * 1975 * When you first glance at this you might think that all entries that 1976 * make up the postion of the cum-ack would be in the nr-mapping 1977 * array only.. i.e. things up to the cum-ack are always 1978 * deliverable. Thats true with one exception, when its a fragmented 1979 * message we may not deliver the data until some threshold (or all 1980 * of it) is in place. So we must OR the nr_mapping_array and 1981 * mapping_array to get a true picture of the cum-ack. 1982 */ 1983 struct sctp_association *asoc; 1984 int at; 1985 uint8_t val; 1986 int slide_from, slide_end, lgap, distance; 1987 uint32_t old_cumack, old_base, old_highest, highest_tsn; 1988 1989 asoc = &stcb->asoc; 1990 1991 old_cumack = asoc->cumulative_tsn; 1992 old_base = asoc->mapping_array_base_tsn; 1993 old_highest = asoc->highest_tsn_inside_map; 1994 /* 1995 * We could probably improve this a small bit by calculating the 1996 * offset of the current cum-ack as the starting point. 1997 */ 1998 at = 0; 1999 for (slide_from = 0; slide_from < stcb->asoc.mapping_array_size; slide_from++) { 2000 val = asoc->nr_mapping_array[slide_from] | asoc->mapping_array[slide_from]; 2001 if (val == 0xff) { 2002 at += 8; 2003 } else { 2004 /* there is a 0 bit */ 2005 at += sctp_map_lookup_tab[val]; 2006 break; 2007 } 2008 } 2009 asoc->cumulative_tsn = asoc->mapping_array_base_tsn + (at - 1); 2010 2011 if (SCTP_TSN_GT(asoc->cumulative_tsn, asoc->highest_tsn_inside_map) && 2012 SCTP_TSN_GT(asoc->cumulative_tsn, asoc->highest_tsn_inside_nr_map)) { 2013 #ifdef INVARIANTS 2014 panic("huh, cumack 0x%x greater than high-tsn 0x%x in map", 2015 asoc->cumulative_tsn, asoc->highest_tsn_inside_map); 2016 #else 2017 SCTP_PRINTF("huh, cumack 0x%x greater than high-tsn 0x%x in map - should panic?\n", 2018 asoc->cumulative_tsn, asoc->highest_tsn_inside_map); 2019 sctp_print_mapping_array(asoc); 2020 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 2021 sctp_log_map(0, 6, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 2022 } 2023 asoc->highest_tsn_inside_map = asoc->cumulative_tsn; 2024 asoc->highest_tsn_inside_nr_map = asoc->cumulative_tsn; 2025 #endif 2026 } 2027 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->highest_tsn_inside_map)) { 2028 highest_tsn = asoc->highest_tsn_inside_nr_map; 2029 } else { 2030 highest_tsn = asoc->highest_tsn_inside_map; 2031 } 2032 if ((asoc->cumulative_tsn == highest_tsn) && (at >= 8)) { 2033 /* The complete array was completed by a single FR */ 2034 /* highest becomes the cum-ack */ 2035 int clr; 2036 2037 #ifdef INVARIANTS 2038 unsigned int i; 2039 2040 #endif 2041 2042 /* clear the array */ 2043 clr = ((at + 7) >> 3); 2044 if (clr > asoc->mapping_array_size) { 2045 clr = asoc->mapping_array_size; 2046 } 2047 memset(asoc->mapping_array, 0, clr); 2048 memset(asoc->nr_mapping_array, 0, clr); 2049 #ifdef INVARIANTS 2050 for (i = 0; i < asoc->mapping_array_size; i++) { 2051 if ((asoc->mapping_array[i]) || (asoc->nr_mapping_array[i])) { 2052 SCTP_PRINTF("Error Mapping array's not clean at clear\n"); 2053 sctp_print_mapping_array(asoc); 2054 } 2055 } 2056 #endif 2057 asoc->mapping_array_base_tsn = asoc->cumulative_tsn + 1; 2058 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map = asoc->cumulative_tsn; 2059 } else if (at >= 8) { 2060 /* we can slide the mapping array down */ 2061 /* slide_from holds where we hit the first NON 0xff byte */ 2062 2063 /* 2064 * now calculate the ceiling of the move using our highest 2065 * TSN value 2066 */ 2067 SCTP_CALC_TSN_TO_GAP(lgap, highest_tsn, asoc->mapping_array_base_tsn); 2068 slide_end = (lgap >> 3); 2069 if (slide_end < slide_from) { 2070 sctp_print_mapping_array(asoc); 2071 #ifdef INVARIANTS 2072 panic("impossible slide"); 2073 #else 2074 SCTP_PRINTF("impossible slide lgap:%x slide_end:%x slide_from:%x? at:%d\n", 2075 lgap, slide_end, slide_from, at); 2076 return; 2077 #endif 2078 } 2079 if (slide_end > asoc->mapping_array_size) { 2080 #ifdef INVARIANTS 2081 panic("would overrun buffer"); 2082 #else 2083 SCTP_PRINTF("Gak, would have overrun map end:%d slide_end:%d\n", 2084 asoc->mapping_array_size, slide_end); 2085 slide_end = asoc->mapping_array_size; 2086 #endif 2087 } 2088 distance = (slide_end - slide_from) + 1; 2089 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 2090 sctp_log_map(old_base, old_cumack, old_highest, 2091 SCTP_MAP_PREPARE_SLIDE); 2092 sctp_log_map((uint32_t) slide_from, (uint32_t) slide_end, 2093 (uint32_t) lgap, SCTP_MAP_SLIDE_FROM); 2094 } 2095 if (distance + slide_from > asoc->mapping_array_size || 2096 distance < 0) { 2097 /* 2098 * Here we do NOT slide forward the array so that 2099 * hopefully when more data comes in to fill it up 2100 * we will be able to slide it forward. Really I 2101 * don't think this should happen :-0 2102 */ 2103 2104 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 2105 sctp_log_map((uint32_t) distance, (uint32_t) slide_from, 2106 (uint32_t) asoc->mapping_array_size, 2107 SCTP_MAP_SLIDE_NONE); 2108 } 2109 } else { 2110 int ii; 2111 2112 for (ii = 0; ii < distance; ii++) { 2113 asoc->mapping_array[ii] = asoc->mapping_array[slide_from + ii]; 2114 asoc->nr_mapping_array[ii] = asoc->nr_mapping_array[slide_from + ii]; 2115 2116 } 2117 for (ii = distance; ii < asoc->mapping_array_size; ii++) { 2118 asoc->mapping_array[ii] = 0; 2119 asoc->nr_mapping_array[ii] = 0; 2120 } 2121 if (asoc->highest_tsn_inside_map + 1 == asoc->mapping_array_base_tsn) { 2122 asoc->highest_tsn_inside_map += (slide_from << 3); 2123 } 2124 if (asoc->highest_tsn_inside_nr_map + 1 == asoc->mapping_array_base_tsn) { 2125 asoc->highest_tsn_inside_nr_map += (slide_from << 3); 2126 } 2127 asoc->mapping_array_base_tsn += (slide_from << 3); 2128 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 2129 sctp_log_map(asoc->mapping_array_base_tsn, 2130 asoc->cumulative_tsn, asoc->highest_tsn_inside_map, 2131 SCTP_MAP_SLIDE_RESULT); 2132 } 2133 } 2134 } 2135 } 2136 2137 void 2138 sctp_sack_check(struct sctp_tcb *stcb, int was_a_gap) 2139 { 2140 struct sctp_association *asoc; 2141 uint32_t highest_tsn; 2142 2143 asoc = &stcb->asoc; 2144 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->highest_tsn_inside_map)) { 2145 highest_tsn = asoc->highest_tsn_inside_nr_map; 2146 } else { 2147 highest_tsn = asoc->highest_tsn_inside_map; 2148 } 2149 2150 /* 2151 * Now we need to see if we need to queue a sack or just start the 2152 * timer (if allowed). 2153 */ 2154 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 2155 /* 2156 * Ok special case, in SHUTDOWN-SENT case. here we maker 2157 * sure SACK timer is off and instead send a SHUTDOWN and a 2158 * SACK 2159 */ 2160 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) { 2161 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, 2162 stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_INDATA + SCTP_LOC_18); 2163 } 2164 sctp_send_shutdown(stcb, 2165 ((stcb->asoc.alternate) ? stcb->asoc.alternate : stcb->asoc.primary_destination)); 2166 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 2167 } else { 2168 int is_a_gap; 2169 2170 /* is there a gap now ? */ 2171 is_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 2172 2173 /* 2174 * CMT DAC algorithm: increase number of packets received 2175 * since last ack 2176 */ 2177 stcb->asoc.cmt_dac_pkts_rcvd++; 2178 2179 if ((stcb->asoc.send_sack == 1) || /* We need to send a 2180 * SACK */ 2181 ((was_a_gap) && (is_a_gap == 0)) || /* was a gap, but no 2182 * longer is one */ 2183 (stcb->asoc.numduptsns) || /* we have dup's */ 2184 (is_a_gap) || /* is still a gap */ 2185 (stcb->asoc.delayed_ack == 0) || /* Delayed sack disabled */ 2186 (stcb->asoc.data_pkts_seen >= stcb->asoc.sack_freq) /* hit limit of pkts */ 2187 ) { 2188 2189 if ((stcb->asoc.sctp_cmt_on_off > 0) && 2190 (SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) && 2191 (stcb->asoc.send_sack == 0) && 2192 (stcb->asoc.numduptsns == 0) && 2193 (stcb->asoc.delayed_ack) && 2194 (!SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer))) { 2195 2196 /* 2197 * CMT DAC algorithm: With CMT, delay acks 2198 * even in the face of 2199 * 2200 * reordering. Therefore, if acks that do not 2201 * have to be sent because of the above 2202 * reasons, will be delayed. That is, acks 2203 * that would have been sent due to gap 2204 * reports will be delayed with DAC. Start 2205 * the delayed ack timer. 2206 */ 2207 sctp_timer_start(SCTP_TIMER_TYPE_RECV, 2208 stcb->sctp_ep, stcb, NULL); 2209 } else { 2210 /* 2211 * Ok we must build a SACK since the timer 2212 * is pending, we got our first packet OR 2213 * there are gaps or duplicates. 2214 */ 2215 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer); 2216 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 2217 } 2218 } else { 2219 if (!SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) { 2220 sctp_timer_start(SCTP_TIMER_TYPE_RECV, 2221 stcb->sctp_ep, stcb, NULL); 2222 } 2223 } 2224 } 2225 } 2226 2227 void 2228 sctp_service_queues(struct sctp_tcb *stcb, struct sctp_association *asoc) 2229 { 2230 struct sctp_tmit_chunk *chk; 2231 uint32_t tsize, pd_point; 2232 uint16_t nxt_todel; 2233 2234 if (asoc->fragmented_delivery_inprogress) { 2235 sctp_service_reassembly(stcb, asoc); 2236 } 2237 /* Can we proceed further, i.e. the PD-API is complete */ 2238 if (asoc->fragmented_delivery_inprogress) { 2239 /* no */ 2240 return; 2241 } 2242 /* 2243 * Now is there some other chunk I can deliver from the reassembly 2244 * queue. 2245 */ 2246 doit_again: 2247 chk = TAILQ_FIRST(&asoc->reasmqueue); 2248 if (chk == NULL) { 2249 asoc->size_on_reasm_queue = 0; 2250 asoc->cnt_on_reasm_queue = 0; 2251 return; 2252 } 2253 nxt_todel = asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered + 1; 2254 if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) && 2255 ((nxt_todel == chk->rec.data.stream_seq) || 2256 (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED))) { 2257 /* 2258 * Yep the first one is here. We setup to start reception, 2259 * by backing down the TSN just in case we can't deliver. 2260 */ 2261 2262 /* 2263 * Before we start though either all of the message should 2264 * be here or the socket buffer max or nothing on the 2265 * delivery queue and something can be delivered. 2266 */ 2267 if (stcb->sctp_socket) { 2268 pd_point = min(SCTP_SB_LIMIT_RCV(stcb->sctp_socket) >> SCTP_PARTIAL_DELIVERY_SHIFT, 2269 stcb->sctp_ep->partial_delivery_point); 2270 } else { 2271 pd_point = stcb->sctp_ep->partial_delivery_point; 2272 } 2273 if (sctp_is_all_msg_on_reasm(asoc, &tsize) || (tsize >= pd_point)) { 2274 asoc->fragmented_delivery_inprogress = 1; 2275 asoc->tsn_last_delivered = chk->rec.data.TSN_seq - 1; 2276 asoc->str_of_pdapi = chk->rec.data.stream_number; 2277 asoc->ssn_of_pdapi = chk->rec.data.stream_seq; 2278 asoc->pdapi_ppid = chk->rec.data.payloadtype; 2279 asoc->fragment_flags = chk->rec.data.rcv_flags; 2280 sctp_service_reassembly(stcb, asoc); 2281 if (asoc->fragmented_delivery_inprogress == 0) { 2282 goto doit_again; 2283 } 2284 } 2285 } 2286 } 2287 2288 int 2289 sctp_process_data(struct mbuf **mm, int iphlen, int *offset, int length, 2290 struct sockaddr *src, struct sockaddr *dst, 2291 struct sctphdr *sh, struct sctp_inpcb *inp, 2292 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t * high_tsn, 2293 uint8_t mflowtype, uint32_t mflowid, 2294 uint32_t vrf_id, uint16_t port) 2295 { 2296 struct sctp_data_chunk *ch, chunk_buf; 2297 struct sctp_association *asoc; 2298 int num_chunks = 0; /* number of control chunks processed */ 2299 int stop_proc = 0; 2300 int chk_length, break_flag, last_chunk; 2301 int abort_flag = 0, was_a_gap; 2302 struct mbuf *m; 2303 uint32_t highest_tsn; 2304 2305 /* set the rwnd */ 2306 sctp_set_rwnd(stcb, &stcb->asoc); 2307 2308 m = *mm; 2309 SCTP_TCB_LOCK_ASSERT(stcb); 2310 asoc = &stcb->asoc; 2311 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->highest_tsn_inside_map)) { 2312 highest_tsn = asoc->highest_tsn_inside_nr_map; 2313 } else { 2314 highest_tsn = asoc->highest_tsn_inside_map; 2315 } 2316 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 2317 /* 2318 * setup where we got the last DATA packet from for any SACK that 2319 * may need to go out. Don't bump the net. This is done ONLY when a 2320 * chunk is assigned. 2321 */ 2322 asoc->last_data_chunk_from = net; 2323 2324 /*- 2325 * Now before we proceed we must figure out if this is a wasted 2326 * cluster... i.e. it is a small packet sent in and yet the driver 2327 * underneath allocated a full cluster for it. If so we must copy it 2328 * to a smaller mbuf and free up the cluster mbuf. This will help 2329 * with cluster starvation. Note for __Panda__ we don't do this 2330 * since it has clusters all the way down to 64 bytes. 2331 */ 2332 if (SCTP_BUF_LEN(m) < (long)MLEN && SCTP_BUF_NEXT(m) == NULL) { 2333 /* we only handle mbufs that are singletons.. not chains */ 2334 m = sctp_get_mbuf_for_msg(SCTP_BUF_LEN(m), 0, M_NOWAIT, 1, MT_DATA); 2335 if (m) { 2336 /* ok lets see if we can copy the data up */ 2337 caddr_t *from, *to; 2338 2339 /* get the pointers and copy */ 2340 to = mtod(m, caddr_t *); 2341 from = mtod((*mm), caddr_t *); 2342 memcpy(to, from, SCTP_BUF_LEN((*mm))); 2343 /* copy the length and free up the old */ 2344 SCTP_BUF_LEN(m) = SCTP_BUF_LEN((*mm)); 2345 sctp_m_freem(*mm); 2346 /* sucess, back copy */ 2347 *mm = m; 2348 } else { 2349 /* We are in trouble in the mbuf world .. yikes */ 2350 m = *mm; 2351 } 2352 } 2353 /* get pointer to the first chunk header */ 2354 ch = (struct sctp_data_chunk *)sctp_m_getptr(m, *offset, 2355 sizeof(struct sctp_data_chunk), (uint8_t *) & chunk_buf); 2356 if (ch == NULL) { 2357 return (1); 2358 } 2359 /* 2360 * process all DATA chunks... 2361 */ 2362 *high_tsn = asoc->cumulative_tsn; 2363 break_flag = 0; 2364 asoc->data_pkts_seen++; 2365 while (stop_proc == 0) { 2366 /* validate chunk length */ 2367 chk_length = ntohs(ch->ch.chunk_length); 2368 if (length - *offset < chk_length) { 2369 /* all done, mutulated chunk */ 2370 stop_proc = 1; 2371 continue; 2372 } 2373 if (ch->ch.chunk_type == SCTP_DATA) { 2374 if ((size_t)chk_length < sizeof(struct sctp_data_chunk)) { 2375 /* 2376 * Need to send an abort since we had a 2377 * invalid data chunk. 2378 */ 2379 struct mbuf *op_err; 2380 char msg[SCTP_DIAG_INFO_LEN]; 2381 2382 snprintf(msg, sizeof(msg), "DATA chunk of length %d", 2383 chk_length); 2384 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 2385 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_19; 2386 sctp_abort_association(inp, stcb, m, iphlen, 2387 src, dst, sh, op_err, 2388 mflowtype, mflowid, 2389 vrf_id, port); 2390 return (2); 2391 } 2392 if ((size_t)chk_length == sizeof(struct sctp_data_chunk)) { 2393 /* 2394 * Need to send an abort since we had an 2395 * empty data chunk. 2396 */ 2397 struct mbuf *op_err; 2398 2399 op_err = sctp_generate_no_user_data_cause(ch->dp.tsn); 2400 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_19; 2401 sctp_abort_association(inp, stcb, m, iphlen, 2402 src, dst, sh, op_err, 2403 mflowtype, mflowid, 2404 vrf_id, port); 2405 return (2); 2406 } 2407 #ifdef SCTP_AUDITING_ENABLED 2408 sctp_audit_log(0xB1, 0); 2409 #endif 2410 if (SCTP_SIZE32(chk_length) == (length - *offset)) { 2411 last_chunk = 1; 2412 } else { 2413 last_chunk = 0; 2414 } 2415 if (sctp_process_a_data_chunk(stcb, asoc, mm, *offset, ch, 2416 chk_length, net, high_tsn, &abort_flag, &break_flag, 2417 last_chunk)) { 2418 num_chunks++; 2419 } 2420 if (abort_flag) 2421 return (2); 2422 2423 if (break_flag) { 2424 /* 2425 * Set because of out of rwnd space and no 2426 * drop rep space left. 2427 */ 2428 stop_proc = 1; 2429 continue; 2430 } 2431 } else { 2432 /* not a data chunk in the data region */ 2433 switch (ch->ch.chunk_type) { 2434 case SCTP_INITIATION: 2435 case SCTP_INITIATION_ACK: 2436 case SCTP_SELECTIVE_ACK: 2437 case SCTP_NR_SELECTIVE_ACK: 2438 case SCTP_HEARTBEAT_REQUEST: 2439 case SCTP_HEARTBEAT_ACK: 2440 case SCTP_ABORT_ASSOCIATION: 2441 case SCTP_SHUTDOWN: 2442 case SCTP_SHUTDOWN_ACK: 2443 case SCTP_OPERATION_ERROR: 2444 case SCTP_COOKIE_ECHO: 2445 case SCTP_COOKIE_ACK: 2446 case SCTP_ECN_ECHO: 2447 case SCTP_ECN_CWR: 2448 case SCTP_SHUTDOWN_COMPLETE: 2449 case SCTP_AUTHENTICATION: 2450 case SCTP_ASCONF_ACK: 2451 case SCTP_PACKET_DROPPED: 2452 case SCTP_STREAM_RESET: 2453 case SCTP_FORWARD_CUM_TSN: 2454 case SCTP_ASCONF: 2455 /* 2456 * Now, what do we do with KNOWN chunks that 2457 * are NOT in the right place? 2458 * 2459 * For now, I do nothing but ignore them. We 2460 * may later want to add sysctl stuff to 2461 * switch out and do either an ABORT() or 2462 * possibly process them. 2463 */ 2464 if (SCTP_BASE_SYSCTL(sctp_strict_data_order)) { 2465 struct mbuf *op_err; 2466 2467 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, ""); 2468 sctp_abort_association(inp, stcb, 2469 m, iphlen, 2470 src, dst, 2471 sh, op_err, 2472 mflowtype, mflowid, 2473 vrf_id, port); 2474 return (2); 2475 } 2476 break; 2477 default: 2478 /* unknown chunk type, use bit rules */ 2479 if (ch->ch.chunk_type & 0x40) { 2480 /* Add a error report to the queue */ 2481 struct mbuf *merr; 2482 struct sctp_paramhdr *phd; 2483 2484 merr = sctp_get_mbuf_for_msg(sizeof(*phd), 0, M_NOWAIT, 1, MT_DATA); 2485 if (merr) { 2486 phd = mtod(merr, struct sctp_paramhdr *); 2487 /* 2488 * We cheat and use param 2489 * type since we did not 2490 * bother to define a error 2491 * cause struct. They are 2492 * the same basic format 2493 * with different names. 2494 */ 2495 phd->param_type = 2496 htons(SCTP_CAUSE_UNRECOG_CHUNK); 2497 phd->param_length = 2498 htons(chk_length + sizeof(*phd)); 2499 SCTP_BUF_LEN(merr) = sizeof(*phd); 2500 SCTP_BUF_NEXT(merr) = SCTP_M_COPYM(m, *offset, chk_length, M_NOWAIT); 2501 if (SCTP_BUF_NEXT(merr)) { 2502 if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(merr), SCTP_SIZE32(chk_length) - chk_length, NULL) == NULL) { 2503 sctp_m_freem(merr); 2504 } else { 2505 sctp_queue_op_err(stcb, merr); 2506 } 2507 } else { 2508 sctp_m_freem(merr); 2509 } 2510 } 2511 } 2512 if ((ch->ch.chunk_type & 0x80) == 0) { 2513 /* discard the rest of this packet */ 2514 stop_proc = 1; 2515 } /* else skip this bad chunk and 2516 * continue... */ 2517 break; 2518 } /* switch of chunk type */ 2519 } 2520 *offset += SCTP_SIZE32(chk_length); 2521 if ((*offset >= length) || stop_proc) { 2522 /* no more data left in the mbuf chain */ 2523 stop_proc = 1; 2524 continue; 2525 } 2526 ch = (struct sctp_data_chunk *)sctp_m_getptr(m, *offset, 2527 sizeof(struct sctp_data_chunk), (uint8_t *) & chunk_buf); 2528 if (ch == NULL) { 2529 *offset = length; 2530 stop_proc = 1; 2531 continue; 2532 } 2533 } 2534 if (break_flag) { 2535 /* 2536 * we need to report rwnd overrun drops. 2537 */ 2538 sctp_send_packet_dropped(stcb, net, *mm, length, iphlen, 0); 2539 } 2540 if (num_chunks) { 2541 /* 2542 * Did we get data, if so update the time for auto-close and 2543 * give peer credit for being alive. 2544 */ 2545 SCTP_STAT_INCR(sctps_recvpktwithdata); 2546 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 2547 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 2548 stcb->asoc.overall_error_count, 2549 0, 2550 SCTP_FROM_SCTP_INDATA, 2551 __LINE__); 2552 } 2553 stcb->asoc.overall_error_count = 0; 2554 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_last_rcvd); 2555 } 2556 /* now service all of the reassm queue if needed */ 2557 if (!(TAILQ_EMPTY(&asoc->reasmqueue))) 2558 sctp_service_queues(stcb, asoc); 2559 2560 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 2561 /* Assure that we ack right away */ 2562 stcb->asoc.send_sack = 1; 2563 } 2564 /* Start a sack timer or QUEUE a SACK for sending */ 2565 sctp_sack_check(stcb, was_a_gap); 2566 return (0); 2567 } 2568 2569 static int 2570 sctp_process_segment_range(struct sctp_tcb *stcb, struct sctp_tmit_chunk **p_tp1, uint32_t last_tsn, 2571 uint16_t frag_strt, uint16_t frag_end, int nr_sacking, 2572 int *num_frs, 2573 uint32_t * biggest_newly_acked_tsn, 2574 uint32_t * this_sack_lowest_newack, 2575 int *rto_ok) 2576 { 2577 struct sctp_tmit_chunk *tp1; 2578 unsigned int theTSN; 2579 int j, wake_him = 0, circled = 0; 2580 2581 /* Recover the tp1 we last saw */ 2582 tp1 = *p_tp1; 2583 if (tp1 == NULL) { 2584 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue); 2585 } 2586 for (j = frag_strt; j <= frag_end; j++) { 2587 theTSN = j + last_tsn; 2588 while (tp1) { 2589 if (tp1->rec.data.doing_fast_retransmit) 2590 (*num_frs) += 1; 2591 2592 /*- 2593 * CMT: CUCv2 algorithm. For each TSN being 2594 * processed from the sent queue, track the 2595 * next expected pseudo-cumack, or 2596 * rtx_pseudo_cumack, if required. Separate 2597 * cumack trackers for first transmissions, 2598 * and retransmissions. 2599 */ 2600 if ((tp1->whoTo->find_pseudo_cumack == 1) && (tp1->sent < SCTP_DATAGRAM_RESEND) && 2601 (tp1->snd_count == 1)) { 2602 tp1->whoTo->pseudo_cumack = tp1->rec.data.TSN_seq; 2603 tp1->whoTo->find_pseudo_cumack = 0; 2604 } 2605 if ((tp1->whoTo->find_rtx_pseudo_cumack == 1) && (tp1->sent < SCTP_DATAGRAM_RESEND) && 2606 (tp1->snd_count > 1)) { 2607 tp1->whoTo->rtx_pseudo_cumack = tp1->rec.data.TSN_seq; 2608 tp1->whoTo->find_rtx_pseudo_cumack = 0; 2609 } 2610 if (tp1->rec.data.TSN_seq == theTSN) { 2611 if (tp1->sent != SCTP_DATAGRAM_UNSENT) { 2612 /*- 2613 * must be held until 2614 * cum-ack passes 2615 */ 2616 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 2617 /*- 2618 * If it is less than RESEND, it is 2619 * now no-longer in flight. 2620 * Higher values may already be set 2621 * via previous Gap Ack Blocks... 2622 * i.e. ACKED or RESEND. 2623 */ 2624 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, 2625 *biggest_newly_acked_tsn)) { 2626 *biggest_newly_acked_tsn = tp1->rec.data.TSN_seq; 2627 } 2628 /*- 2629 * CMT: SFR algo (and HTNA) - set 2630 * saw_newack to 1 for dest being 2631 * newly acked. update 2632 * this_sack_highest_newack if 2633 * appropriate. 2634 */ 2635 if (tp1->rec.data.chunk_was_revoked == 0) 2636 tp1->whoTo->saw_newack = 1; 2637 2638 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, 2639 tp1->whoTo->this_sack_highest_newack)) { 2640 tp1->whoTo->this_sack_highest_newack = 2641 tp1->rec.data.TSN_seq; 2642 } 2643 /*- 2644 * CMT DAC algo: also update 2645 * this_sack_lowest_newack 2646 */ 2647 if (*this_sack_lowest_newack == 0) { 2648 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 2649 sctp_log_sack(*this_sack_lowest_newack, 2650 last_tsn, 2651 tp1->rec.data.TSN_seq, 2652 0, 2653 0, 2654 SCTP_LOG_TSN_ACKED); 2655 } 2656 *this_sack_lowest_newack = tp1->rec.data.TSN_seq; 2657 } 2658 /*- 2659 * CMT: CUCv2 algorithm. If (rtx-)pseudo-cumack for corresp 2660 * dest is being acked, then we have a new (rtx-)pseudo-cumack. Set 2661 * new_(rtx_)pseudo_cumack to TRUE so that the cwnd for this dest can be 2662 * updated. Also trigger search for the next expected (rtx-)pseudo-cumack. 2663 * Separate pseudo_cumack trackers for first transmissions and 2664 * retransmissions. 2665 */ 2666 if (tp1->rec.data.TSN_seq == tp1->whoTo->pseudo_cumack) { 2667 if (tp1->rec.data.chunk_was_revoked == 0) { 2668 tp1->whoTo->new_pseudo_cumack = 1; 2669 } 2670 tp1->whoTo->find_pseudo_cumack = 1; 2671 } 2672 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 2673 sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK); 2674 } 2675 if (tp1->rec.data.TSN_seq == tp1->whoTo->rtx_pseudo_cumack) { 2676 if (tp1->rec.data.chunk_was_revoked == 0) { 2677 tp1->whoTo->new_pseudo_cumack = 1; 2678 } 2679 tp1->whoTo->find_rtx_pseudo_cumack = 1; 2680 } 2681 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 2682 sctp_log_sack(*biggest_newly_acked_tsn, 2683 last_tsn, 2684 tp1->rec.data.TSN_seq, 2685 frag_strt, 2686 frag_end, 2687 SCTP_LOG_TSN_ACKED); 2688 } 2689 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 2690 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_GAP, 2691 tp1->whoTo->flight_size, 2692 tp1->book_size, 2693 (uintptr_t) tp1->whoTo, 2694 tp1->rec.data.TSN_seq); 2695 } 2696 sctp_flight_size_decrease(tp1); 2697 if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) { 2698 (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo, 2699 tp1); 2700 } 2701 sctp_total_flight_decrease(stcb, tp1); 2702 2703 tp1->whoTo->net_ack += tp1->send_size; 2704 if (tp1->snd_count < 2) { 2705 /*- 2706 * True non-retransmited chunk 2707 */ 2708 tp1->whoTo->net_ack2 += tp1->send_size; 2709 2710 /*- 2711 * update RTO too ? 2712 */ 2713 if (tp1->do_rtt) { 2714 if (*rto_ok) { 2715 tp1->whoTo->RTO = 2716 sctp_calculate_rto(stcb, 2717 &stcb->asoc, 2718 tp1->whoTo, 2719 &tp1->sent_rcv_time, 2720 sctp_align_safe_nocopy, 2721 SCTP_RTT_FROM_DATA); 2722 *rto_ok = 0; 2723 } 2724 if (tp1->whoTo->rto_needed == 0) { 2725 tp1->whoTo->rto_needed = 1; 2726 } 2727 tp1->do_rtt = 0; 2728 } 2729 } 2730 } 2731 if (tp1->sent <= SCTP_DATAGRAM_RESEND) { 2732 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, 2733 stcb->asoc.this_sack_highest_gap)) { 2734 stcb->asoc.this_sack_highest_gap = 2735 tp1->rec.data.TSN_seq; 2736 } 2737 if (tp1->sent == SCTP_DATAGRAM_RESEND) { 2738 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt); 2739 #ifdef SCTP_AUDITING_ENABLED 2740 sctp_audit_log(0xB2, 2741 (stcb->asoc.sent_queue_retran_cnt & 0x000000ff)); 2742 #endif 2743 } 2744 } 2745 /*- 2746 * All chunks NOT UNSENT fall through here and are marked 2747 * (leave PR-SCTP ones that are to skip alone though) 2748 */ 2749 if ((tp1->sent != SCTP_FORWARD_TSN_SKIP) && 2750 (tp1->sent != SCTP_DATAGRAM_NR_ACKED)) { 2751 tp1->sent = SCTP_DATAGRAM_MARKED; 2752 } 2753 if (tp1->rec.data.chunk_was_revoked) { 2754 /* deflate the cwnd */ 2755 tp1->whoTo->cwnd -= tp1->book_size; 2756 tp1->rec.data.chunk_was_revoked = 0; 2757 } 2758 /* NR Sack code here */ 2759 if (nr_sacking && 2760 (tp1->sent != SCTP_DATAGRAM_NR_ACKED)) { 2761 if (stcb->asoc.strmout[tp1->rec.data.stream_number].chunks_on_queues > 0) { 2762 stcb->asoc.strmout[tp1->rec.data.stream_number].chunks_on_queues--; 2763 #ifdef INVARIANTS 2764 } else { 2765 panic("No chunks on the queues for sid %u.", tp1->rec.data.stream_number); 2766 #endif 2767 } 2768 tp1->sent = SCTP_DATAGRAM_NR_ACKED; 2769 if (tp1->data) { 2770 /* 2771 * sa_ignore 2772 * NO_NULL_CHK 2773 */ 2774 sctp_free_bufspace(stcb, &stcb->asoc, tp1, 1); 2775 sctp_m_freem(tp1->data); 2776 tp1->data = NULL; 2777 } 2778 wake_him++; 2779 } 2780 } 2781 break; 2782 } /* if (tp1->TSN_seq == theTSN) */ 2783 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, theTSN)) { 2784 break; 2785 } 2786 tp1 = TAILQ_NEXT(tp1, sctp_next); 2787 if ((tp1 == NULL) && (circled == 0)) { 2788 circled++; 2789 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue); 2790 } 2791 } /* end while (tp1) */ 2792 if (tp1 == NULL) { 2793 circled = 0; 2794 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue); 2795 } 2796 /* In case the fragments were not in order we must reset */ 2797 } /* end for (j = fragStart */ 2798 *p_tp1 = tp1; 2799 return (wake_him); /* Return value only used for nr-sack */ 2800 } 2801 2802 2803 static int 2804 sctp_handle_segments(struct mbuf *m, int *offset, struct sctp_tcb *stcb, struct sctp_association *asoc, 2805 uint32_t last_tsn, uint32_t * biggest_tsn_acked, 2806 uint32_t * biggest_newly_acked_tsn, uint32_t * this_sack_lowest_newack, 2807 int num_seg, int num_nr_seg, int *rto_ok) 2808 { 2809 struct sctp_gap_ack_block *frag, block; 2810 struct sctp_tmit_chunk *tp1; 2811 int i; 2812 int num_frs = 0; 2813 int chunk_freed; 2814 int non_revocable; 2815 uint16_t frag_strt, frag_end, prev_frag_end; 2816 2817 tp1 = TAILQ_FIRST(&asoc->sent_queue); 2818 prev_frag_end = 0; 2819 chunk_freed = 0; 2820 2821 for (i = 0; i < (num_seg + num_nr_seg); i++) { 2822 if (i == num_seg) { 2823 prev_frag_end = 0; 2824 tp1 = TAILQ_FIRST(&asoc->sent_queue); 2825 } 2826 frag = (struct sctp_gap_ack_block *)sctp_m_getptr(m, *offset, 2827 sizeof(struct sctp_gap_ack_block), (uint8_t *) & block); 2828 *offset += sizeof(block); 2829 if (frag == NULL) { 2830 return (chunk_freed); 2831 } 2832 frag_strt = ntohs(frag->start); 2833 frag_end = ntohs(frag->end); 2834 2835 if (frag_strt > frag_end) { 2836 /* This gap report is malformed, skip it. */ 2837 continue; 2838 } 2839 if (frag_strt <= prev_frag_end) { 2840 /* This gap report is not in order, so restart. */ 2841 tp1 = TAILQ_FIRST(&asoc->sent_queue); 2842 } 2843 if (SCTP_TSN_GT((last_tsn + frag_end), *biggest_tsn_acked)) { 2844 *biggest_tsn_acked = last_tsn + frag_end; 2845 } 2846 if (i < num_seg) { 2847 non_revocable = 0; 2848 } else { 2849 non_revocable = 1; 2850 } 2851 if (sctp_process_segment_range(stcb, &tp1, last_tsn, frag_strt, frag_end, 2852 non_revocable, &num_frs, biggest_newly_acked_tsn, 2853 this_sack_lowest_newack, rto_ok)) { 2854 chunk_freed = 1; 2855 } 2856 prev_frag_end = frag_end; 2857 } 2858 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 2859 if (num_frs) 2860 sctp_log_fr(*biggest_tsn_acked, 2861 *biggest_newly_acked_tsn, 2862 last_tsn, SCTP_FR_LOG_BIGGEST_TSNS); 2863 } 2864 return (chunk_freed); 2865 } 2866 2867 static void 2868 sctp_check_for_revoked(struct sctp_tcb *stcb, 2869 struct sctp_association *asoc, uint32_t cumack, 2870 uint32_t biggest_tsn_acked) 2871 { 2872 struct sctp_tmit_chunk *tp1; 2873 2874 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 2875 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, cumack)) { 2876 /* 2877 * ok this guy is either ACK or MARKED. If it is 2878 * ACKED it has been previously acked but not this 2879 * time i.e. revoked. If it is MARKED it was ACK'ed 2880 * again. 2881 */ 2882 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, biggest_tsn_acked)) { 2883 break; 2884 } 2885 if (tp1->sent == SCTP_DATAGRAM_ACKED) { 2886 /* it has been revoked */ 2887 tp1->sent = SCTP_DATAGRAM_SENT; 2888 tp1->rec.data.chunk_was_revoked = 1; 2889 /* 2890 * We must add this stuff back in to assure 2891 * timers and such get started. 2892 */ 2893 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 2894 sctp_misc_ints(SCTP_FLIGHT_LOG_UP_REVOKE, 2895 tp1->whoTo->flight_size, 2896 tp1->book_size, 2897 (uintptr_t) tp1->whoTo, 2898 tp1->rec.data.TSN_seq); 2899 } 2900 sctp_flight_size_increase(tp1); 2901 sctp_total_flight_increase(stcb, tp1); 2902 /* 2903 * We inflate the cwnd to compensate for our 2904 * artificial inflation of the flight_size. 2905 */ 2906 tp1->whoTo->cwnd += tp1->book_size; 2907 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 2908 sctp_log_sack(asoc->last_acked_seq, 2909 cumack, 2910 tp1->rec.data.TSN_seq, 2911 0, 2912 0, 2913 SCTP_LOG_TSN_REVOKED); 2914 } 2915 } else if (tp1->sent == SCTP_DATAGRAM_MARKED) { 2916 /* it has been re-acked in this SACK */ 2917 tp1->sent = SCTP_DATAGRAM_ACKED; 2918 } 2919 } 2920 if (tp1->sent == SCTP_DATAGRAM_UNSENT) 2921 break; 2922 } 2923 } 2924 2925 2926 static void 2927 sctp_strike_gap_ack_chunks(struct sctp_tcb *stcb, struct sctp_association *asoc, 2928 uint32_t biggest_tsn_acked, uint32_t biggest_tsn_newly_acked, uint32_t this_sack_lowest_newack, int accum_moved) 2929 { 2930 struct sctp_tmit_chunk *tp1; 2931 int strike_flag = 0; 2932 struct timeval now; 2933 int tot_retrans = 0; 2934 uint32_t sending_seq; 2935 struct sctp_nets *net; 2936 int num_dests_sacked = 0; 2937 2938 /* 2939 * select the sending_seq, this is either the next thing ready to be 2940 * sent but not transmitted, OR, the next seq we assign. 2941 */ 2942 tp1 = TAILQ_FIRST(&stcb->asoc.send_queue); 2943 if (tp1 == NULL) { 2944 sending_seq = asoc->sending_seq; 2945 } else { 2946 sending_seq = tp1->rec.data.TSN_seq; 2947 } 2948 2949 /* CMT DAC algo: finding out if SACK is a mixed SACK */ 2950 if ((asoc->sctp_cmt_on_off > 0) && 2951 SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) { 2952 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 2953 if (net->saw_newack) 2954 num_dests_sacked++; 2955 } 2956 } 2957 if (stcb->asoc.prsctp_supported) { 2958 (void)SCTP_GETTIME_TIMEVAL(&now); 2959 } 2960 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 2961 strike_flag = 0; 2962 if (tp1->no_fr_allowed) { 2963 /* this one had a timeout or something */ 2964 continue; 2965 } 2966 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 2967 if (tp1->sent < SCTP_DATAGRAM_RESEND) 2968 sctp_log_fr(biggest_tsn_newly_acked, 2969 tp1->rec.data.TSN_seq, 2970 tp1->sent, 2971 SCTP_FR_LOG_CHECK_STRIKE); 2972 } 2973 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, biggest_tsn_acked) || 2974 tp1->sent == SCTP_DATAGRAM_UNSENT) { 2975 /* done */ 2976 break; 2977 } 2978 if (stcb->asoc.prsctp_supported) { 2979 if ((PR_SCTP_TTL_ENABLED(tp1->flags)) && tp1->sent < SCTP_DATAGRAM_ACKED) { 2980 /* Is it expired? */ 2981 if (timevalcmp(&now, &tp1->rec.data.timetodrop, >)) { 2982 /* Yes so drop it */ 2983 if (tp1->data != NULL) { 2984 (void)sctp_release_pr_sctp_chunk(stcb, tp1, 1, 2985 SCTP_SO_NOT_LOCKED); 2986 } 2987 continue; 2988 } 2989 } 2990 } 2991 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, asoc->this_sack_highest_gap)) { 2992 /* we are beyond the tsn in the sack */ 2993 break; 2994 } 2995 if (tp1->sent >= SCTP_DATAGRAM_RESEND) { 2996 /* either a RESEND, ACKED, or MARKED */ 2997 /* skip */ 2998 if (tp1->sent == SCTP_FORWARD_TSN_SKIP) { 2999 /* Continue strikin FWD-TSN chunks */ 3000 tp1->rec.data.fwd_tsn_cnt++; 3001 } 3002 continue; 3003 } 3004 /* 3005 * CMT : SFR algo (covers part of DAC and HTNA as well) 3006 */ 3007 if (tp1->whoTo && tp1->whoTo->saw_newack == 0) { 3008 /* 3009 * No new acks were receieved for data sent to this 3010 * dest. Therefore, according to the SFR algo for 3011 * CMT, no data sent to this dest can be marked for 3012 * FR using this SACK. 3013 */ 3014 continue; 3015 } else if (tp1->whoTo && SCTP_TSN_GT(tp1->rec.data.TSN_seq, 3016 tp1->whoTo->this_sack_highest_newack)) { 3017 /* 3018 * CMT: New acks were receieved for data sent to 3019 * this dest. But no new acks were seen for data 3020 * sent after tp1. Therefore, according to the SFR 3021 * algo for CMT, tp1 cannot be marked for FR using 3022 * this SACK. This step covers part of the DAC algo 3023 * and the HTNA algo as well. 3024 */ 3025 continue; 3026 } 3027 /* 3028 * Here we check to see if we were have already done a FR 3029 * and if so we see if the biggest TSN we saw in the sack is 3030 * smaller than the recovery point. If so we don't strike 3031 * the tsn... otherwise we CAN strike the TSN. 3032 */ 3033 /* 3034 * @@@ JRI: Check for CMT if (accum_moved && 3035 * asoc->fast_retran_loss_recovery && (sctp_cmt_on_off == 3036 * 0)) { 3037 */ 3038 if (accum_moved && asoc->fast_retran_loss_recovery) { 3039 /* 3040 * Strike the TSN if in fast-recovery and cum-ack 3041 * moved. 3042 */ 3043 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3044 sctp_log_fr(biggest_tsn_newly_acked, 3045 tp1->rec.data.TSN_seq, 3046 tp1->sent, 3047 SCTP_FR_LOG_STRIKE_CHUNK); 3048 } 3049 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3050 tp1->sent++; 3051 } 3052 if ((asoc->sctp_cmt_on_off > 0) && 3053 SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) { 3054 /* 3055 * CMT DAC algorithm: If SACK flag is set to 3056 * 0, then lowest_newack test will not pass 3057 * because it would have been set to the 3058 * cumack earlier. If not already to be 3059 * rtx'd, If not a mixed sack and if tp1 is 3060 * not between two sacked TSNs, then mark by 3061 * one more. NOTE that we are marking by one 3062 * additional time since the SACK DAC flag 3063 * indicates that two packets have been 3064 * received after this missing TSN. 3065 */ 3066 if ((tp1->sent < SCTP_DATAGRAM_RESEND) && (num_dests_sacked == 1) && 3067 SCTP_TSN_GT(this_sack_lowest_newack, tp1->rec.data.TSN_seq)) { 3068 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3069 sctp_log_fr(16 + num_dests_sacked, 3070 tp1->rec.data.TSN_seq, 3071 tp1->sent, 3072 SCTP_FR_LOG_STRIKE_CHUNK); 3073 } 3074 tp1->sent++; 3075 } 3076 } 3077 } else if ((tp1->rec.data.doing_fast_retransmit) && 3078 (asoc->sctp_cmt_on_off == 0)) { 3079 /* 3080 * For those that have done a FR we must take 3081 * special consideration if we strike. I.e the 3082 * biggest_newly_acked must be higher than the 3083 * sending_seq at the time we did the FR. 3084 */ 3085 if ( 3086 #ifdef SCTP_FR_TO_ALTERNATE 3087 /* 3088 * If FR's go to new networks, then we must only do 3089 * this for singly homed asoc's. However if the FR's 3090 * go to the same network (Armando's work) then its 3091 * ok to FR multiple times. 3092 */ 3093 (asoc->numnets < 2) 3094 #else 3095 (1) 3096 #endif 3097 ) { 3098 3099 if (SCTP_TSN_GE(biggest_tsn_newly_acked, 3100 tp1->rec.data.fast_retran_tsn)) { 3101 /* 3102 * Strike the TSN, since this ack is 3103 * beyond where things were when we 3104 * did a FR. 3105 */ 3106 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3107 sctp_log_fr(biggest_tsn_newly_acked, 3108 tp1->rec.data.TSN_seq, 3109 tp1->sent, 3110 SCTP_FR_LOG_STRIKE_CHUNK); 3111 } 3112 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3113 tp1->sent++; 3114 } 3115 strike_flag = 1; 3116 if ((asoc->sctp_cmt_on_off > 0) && 3117 SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) { 3118 /* 3119 * CMT DAC algorithm: If 3120 * SACK flag is set to 0, 3121 * then lowest_newack test 3122 * will not pass because it 3123 * would have been set to 3124 * the cumack earlier. If 3125 * not already to be rtx'd, 3126 * If not a mixed sack and 3127 * if tp1 is not between two 3128 * sacked TSNs, then mark by 3129 * one more. NOTE that we 3130 * are marking by one 3131 * additional time since the 3132 * SACK DAC flag indicates 3133 * that two packets have 3134 * been received after this 3135 * missing TSN. 3136 */ 3137 if ((tp1->sent < SCTP_DATAGRAM_RESEND) && 3138 (num_dests_sacked == 1) && 3139 SCTP_TSN_GT(this_sack_lowest_newack, 3140 tp1->rec.data.TSN_seq)) { 3141 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3142 sctp_log_fr(32 + num_dests_sacked, 3143 tp1->rec.data.TSN_seq, 3144 tp1->sent, 3145 SCTP_FR_LOG_STRIKE_CHUNK); 3146 } 3147 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3148 tp1->sent++; 3149 } 3150 } 3151 } 3152 } 3153 } 3154 /* 3155 * JRI: TODO: remove code for HTNA algo. CMT's SFR 3156 * algo covers HTNA. 3157 */ 3158 } else if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, 3159 biggest_tsn_newly_acked)) { 3160 /* 3161 * We don't strike these: This is the HTNA 3162 * algorithm i.e. we don't strike If our TSN is 3163 * larger than the Highest TSN Newly Acked. 3164 */ 3165 ; 3166 } else { 3167 /* Strike the TSN */ 3168 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3169 sctp_log_fr(biggest_tsn_newly_acked, 3170 tp1->rec.data.TSN_seq, 3171 tp1->sent, 3172 SCTP_FR_LOG_STRIKE_CHUNK); 3173 } 3174 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3175 tp1->sent++; 3176 } 3177 if ((asoc->sctp_cmt_on_off > 0) && 3178 SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) { 3179 /* 3180 * CMT DAC algorithm: If SACK flag is set to 3181 * 0, then lowest_newack test will not pass 3182 * because it would have been set to the 3183 * cumack earlier. If not already to be 3184 * rtx'd, If not a mixed sack and if tp1 is 3185 * not between two sacked TSNs, then mark by 3186 * one more. NOTE that we are marking by one 3187 * additional time since the SACK DAC flag 3188 * indicates that two packets have been 3189 * received after this missing TSN. 3190 */ 3191 if ((tp1->sent < SCTP_DATAGRAM_RESEND) && (num_dests_sacked == 1) && 3192 SCTP_TSN_GT(this_sack_lowest_newack, tp1->rec.data.TSN_seq)) { 3193 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3194 sctp_log_fr(48 + num_dests_sacked, 3195 tp1->rec.data.TSN_seq, 3196 tp1->sent, 3197 SCTP_FR_LOG_STRIKE_CHUNK); 3198 } 3199 tp1->sent++; 3200 } 3201 } 3202 } 3203 if (tp1->sent == SCTP_DATAGRAM_RESEND) { 3204 struct sctp_nets *alt; 3205 3206 /* fix counts and things */ 3207 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3208 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_RSND, 3209 (tp1->whoTo ? (tp1->whoTo->flight_size) : 0), 3210 tp1->book_size, 3211 (uintptr_t) tp1->whoTo, 3212 tp1->rec.data.TSN_seq); 3213 } 3214 if (tp1->whoTo) { 3215 tp1->whoTo->net_ack++; 3216 sctp_flight_size_decrease(tp1); 3217 if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) { 3218 (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo, 3219 tp1); 3220 } 3221 } 3222 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) { 3223 sctp_log_rwnd(SCTP_INCREASE_PEER_RWND, 3224 asoc->peers_rwnd, tp1->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)); 3225 } 3226 /* add back to the rwnd */ 3227 asoc->peers_rwnd += (tp1->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)); 3228 3229 /* remove from the total flight */ 3230 sctp_total_flight_decrease(stcb, tp1); 3231 3232 if ((stcb->asoc.prsctp_supported) && 3233 (PR_SCTP_RTX_ENABLED(tp1->flags))) { 3234 /* 3235 * Has it been retransmitted tv_sec times? - 3236 * we store the retran count there. 3237 */ 3238 if (tp1->snd_count > tp1->rec.data.timetodrop.tv_sec) { 3239 /* Yes, so drop it */ 3240 if (tp1->data != NULL) { 3241 (void)sctp_release_pr_sctp_chunk(stcb, tp1, 1, 3242 SCTP_SO_NOT_LOCKED); 3243 } 3244 /* Make sure to flag we had a FR */ 3245 tp1->whoTo->net_ack++; 3246 continue; 3247 } 3248 } 3249 /* 3250 * SCTP_PRINTF("OK, we are now ready to FR this 3251 * guy\n"); 3252 */ 3253 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3254 sctp_log_fr(tp1->rec.data.TSN_seq, tp1->snd_count, 3255 0, SCTP_FR_MARKED); 3256 } 3257 if (strike_flag) { 3258 /* This is a subsequent FR */ 3259 SCTP_STAT_INCR(sctps_sendmultfastretrans); 3260 } 3261 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3262 if (asoc->sctp_cmt_on_off > 0) { 3263 /* 3264 * CMT: Using RTX_SSTHRESH policy for CMT. 3265 * If CMT is being used, then pick dest with 3266 * largest ssthresh for any retransmission. 3267 */ 3268 tp1->no_fr_allowed = 1; 3269 alt = tp1->whoTo; 3270 /* sa_ignore NO_NULL_CHK */ 3271 if (asoc->sctp_cmt_pf > 0) { 3272 /* 3273 * JRS 5/18/07 - If CMT PF is on, 3274 * use the PF version of 3275 * find_alt_net() 3276 */ 3277 alt = sctp_find_alternate_net(stcb, alt, 2); 3278 } else { 3279 /* 3280 * JRS 5/18/07 - If only CMT is on, 3281 * use the CMT version of 3282 * find_alt_net() 3283 */ 3284 /* sa_ignore NO_NULL_CHK */ 3285 alt = sctp_find_alternate_net(stcb, alt, 1); 3286 } 3287 if (alt == NULL) { 3288 alt = tp1->whoTo; 3289 } 3290 /* 3291 * CUCv2: If a different dest is picked for 3292 * the retransmission, then new 3293 * (rtx-)pseudo_cumack needs to be tracked 3294 * for orig dest. Let CUCv2 track new (rtx-) 3295 * pseudo-cumack always. 3296 */ 3297 if (tp1->whoTo) { 3298 tp1->whoTo->find_pseudo_cumack = 1; 3299 tp1->whoTo->find_rtx_pseudo_cumack = 1; 3300 } 3301 } else {/* CMT is OFF */ 3302 3303 #ifdef SCTP_FR_TO_ALTERNATE 3304 /* Can we find an alternate? */ 3305 alt = sctp_find_alternate_net(stcb, tp1->whoTo, 0); 3306 #else 3307 /* 3308 * default behavior is to NOT retransmit 3309 * FR's to an alternate. Armando Caro's 3310 * paper details why. 3311 */ 3312 alt = tp1->whoTo; 3313 #endif 3314 } 3315 3316 tp1->rec.data.doing_fast_retransmit = 1; 3317 tot_retrans++; 3318 /* mark the sending seq for possible subsequent FR's */ 3319 /* 3320 * SCTP_PRINTF("Marking TSN for FR new value %x\n", 3321 * (uint32_t)tpi->rec.data.TSN_seq); 3322 */ 3323 if (TAILQ_EMPTY(&asoc->send_queue)) { 3324 /* 3325 * If the queue of send is empty then its 3326 * the next sequence number that will be 3327 * assigned so we subtract one from this to 3328 * get the one we last sent. 3329 */ 3330 tp1->rec.data.fast_retran_tsn = sending_seq; 3331 } else { 3332 /* 3333 * If there are chunks on the send queue 3334 * (unsent data that has made it from the 3335 * stream queues but not out the door, we 3336 * take the first one (which will have the 3337 * lowest TSN) and subtract one to get the 3338 * one we last sent. 3339 */ 3340 struct sctp_tmit_chunk *ttt; 3341 3342 ttt = TAILQ_FIRST(&asoc->send_queue); 3343 tp1->rec.data.fast_retran_tsn = 3344 ttt->rec.data.TSN_seq; 3345 } 3346 3347 if (tp1->do_rtt) { 3348 /* 3349 * this guy had a RTO calculation pending on 3350 * it, cancel it 3351 */ 3352 if ((tp1->whoTo != NULL) && 3353 (tp1->whoTo->rto_needed == 0)) { 3354 tp1->whoTo->rto_needed = 1; 3355 } 3356 tp1->do_rtt = 0; 3357 } 3358 if (alt != tp1->whoTo) { 3359 /* yes, there is an alternate. */ 3360 sctp_free_remote_addr(tp1->whoTo); 3361 /* sa_ignore FREED_MEMORY */ 3362 tp1->whoTo = alt; 3363 atomic_add_int(&alt->ref_count, 1); 3364 } 3365 } 3366 } 3367 } 3368 3369 struct sctp_tmit_chunk * 3370 sctp_try_advance_peer_ack_point(struct sctp_tcb *stcb, 3371 struct sctp_association *asoc) 3372 { 3373 struct sctp_tmit_chunk *tp1, *tp2, *a_adv = NULL; 3374 struct timeval now; 3375 int now_filled = 0; 3376 3377 if (asoc->prsctp_supported == 0) { 3378 return (NULL); 3379 } 3380 TAILQ_FOREACH_SAFE(tp1, &asoc->sent_queue, sctp_next, tp2) { 3381 if (tp1->sent != SCTP_FORWARD_TSN_SKIP && 3382 tp1->sent != SCTP_DATAGRAM_RESEND && 3383 tp1->sent != SCTP_DATAGRAM_NR_ACKED) { 3384 /* no chance to advance, out of here */ 3385 break; 3386 } 3387 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) { 3388 if ((tp1->sent == SCTP_FORWARD_TSN_SKIP) || 3389 (tp1->sent == SCTP_DATAGRAM_NR_ACKED)) { 3390 sctp_misc_ints(SCTP_FWD_TSN_CHECK, 3391 asoc->advanced_peer_ack_point, 3392 tp1->rec.data.TSN_seq, 0, 0); 3393 } 3394 } 3395 if (!PR_SCTP_ENABLED(tp1->flags)) { 3396 /* 3397 * We can't fwd-tsn past any that are reliable aka 3398 * retransmitted until the asoc fails. 3399 */ 3400 break; 3401 } 3402 if (!now_filled) { 3403 (void)SCTP_GETTIME_TIMEVAL(&now); 3404 now_filled = 1; 3405 } 3406 /* 3407 * now we got a chunk which is marked for another 3408 * retransmission to a PR-stream but has run out its chances 3409 * already maybe OR has been marked to skip now. Can we skip 3410 * it if its a resend? 3411 */ 3412 if (tp1->sent == SCTP_DATAGRAM_RESEND && 3413 (PR_SCTP_TTL_ENABLED(tp1->flags))) { 3414 /* 3415 * Now is this one marked for resend and its time is 3416 * now up? 3417 */ 3418 if (timevalcmp(&now, &tp1->rec.data.timetodrop, >)) { 3419 /* Yes so drop it */ 3420 if (tp1->data) { 3421 (void)sctp_release_pr_sctp_chunk(stcb, tp1, 3422 1, SCTP_SO_NOT_LOCKED); 3423 } 3424 } else { 3425 /* 3426 * No, we are done when hit one for resend 3427 * whos time as not expired. 3428 */ 3429 break; 3430 } 3431 } 3432 /* 3433 * Ok now if this chunk is marked to drop it we can clean up 3434 * the chunk, advance our peer ack point and we can check 3435 * the next chunk. 3436 */ 3437 if ((tp1->sent == SCTP_FORWARD_TSN_SKIP) || 3438 (tp1->sent == SCTP_DATAGRAM_NR_ACKED)) { 3439 /* advance PeerAckPoint goes forward */ 3440 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, asoc->advanced_peer_ack_point)) { 3441 asoc->advanced_peer_ack_point = tp1->rec.data.TSN_seq; 3442 a_adv = tp1; 3443 } else if (tp1->rec.data.TSN_seq == asoc->advanced_peer_ack_point) { 3444 /* No update but we do save the chk */ 3445 a_adv = tp1; 3446 } 3447 } else { 3448 /* 3449 * If it is still in RESEND we can advance no 3450 * further 3451 */ 3452 break; 3453 } 3454 } 3455 return (a_adv); 3456 } 3457 3458 static int 3459 sctp_fs_audit(struct sctp_association *asoc) 3460 { 3461 struct sctp_tmit_chunk *chk; 3462 int inflight = 0, resend = 0, inbetween = 0, acked = 0, above = 0; 3463 int entry_flight, entry_cnt, ret; 3464 3465 entry_flight = asoc->total_flight; 3466 entry_cnt = asoc->total_flight_count; 3467 ret = 0; 3468 3469 if (asoc->pr_sctp_cnt >= asoc->sent_queue_cnt) 3470 return (0); 3471 3472 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) { 3473 if (chk->sent < SCTP_DATAGRAM_RESEND) { 3474 SCTP_PRINTF("Chk TSN:%u size:%d inflight cnt:%d\n", 3475 chk->rec.data.TSN_seq, 3476 chk->send_size, 3477 chk->snd_count); 3478 inflight++; 3479 } else if (chk->sent == SCTP_DATAGRAM_RESEND) { 3480 resend++; 3481 } else if (chk->sent < SCTP_DATAGRAM_ACKED) { 3482 inbetween++; 3483 } else if (chk->sent > SCTP_DATAGRAM_ACKED) { 3484 above++; 3485 } else { 3486 acked++; 3487 } 3488 } 3489 3490 if ((inflight > 0) || (inbetween > 0)) { 3491 #ifdef INVARIANTS 3492 panic("Flight size-express incorrect? \n"); 3493 #else 3494 SCTP_PRINTF("asoc->total_flight:%d cnt:%d\n", 3495 entry_flight, entry_cnt); 3496 3497 SCTP_PRINTF("Flight size-express incorrect F:%d I:%d R:%d Ab:%d ACK:%d\n", 3498 inflight, inbetween, resend, above, acked); 3499 ret = 1; 3500 #endif 3501 } 3502 return (ret); 3503 } 3504 3505 3506 static void 3507 sctp_window_probe_recovery(struct sctp_tcb *stcb, 3508 struct sctp_association *asoc, 3509 struct sctp_tmit_chunk *tp1) 3510 { 3511 tp1->window_probe = 0; 3512 if ((tp1->sent >= SCTP_DATAGRAM_ACKED) || (tp1->data == NULL)) { 3513 /* TSN's skipped we do NOT move back. */ 3514 sctp_misc_ints(SCTP_FLIGHT_LOG_DWN_WP_FWD, 3515 tp1->whoTo->flight_size, 3516 tp1->book_size, 3517 (uintptr_t) tp1->whoTo, 3518 tp1->rec.data.TSN_seq); 3519 return; 3520 } 3521 /* First setup this by shrinking flight */ 3522 if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) { 3523 (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo, 3524 tp1); 3525 } 3526 sctp_flight_size_decrease(tp1); 3527 sctp_total_flight_decrease(stcb, tp1); 3528 /* Now mark for resend */ 3529 tp1->sent = SCTP_DATAGRAM_RESEND; 3530 sctp_ucount_incr(asoc->sent_queue_retran_cnt); 3531 3532 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3533 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_WP, 3534 tp1->whoTo->flight_size, 3535 tp1->book_size, 3536 (uintptr_t) tp1->whoTo, 3537 tp1->rec.data.TSN_seq); 3538 } 3539 } 3540 3541 void 3542 sctp_express_handle_sack(struct sctp_tcb *stcb, uint32_t cumack, 3543 uint32_t rwnd, int *abort_now, int ecne_seen) 3544 { 3545 struct sctp_nets *net; 3546 struct sctp_association *asoc; 3547 struct sctp_tmit_chunk *tp1, *tp2; 3548 uint32_t old_rwnd; 3549 int win_probe_recovery = 0; 3550 int win_probe_recovered = 0; 3551 int j, done_once = 0; 3552 int rto_ok = 1; 3553 3554 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_SACK_ARRIVALS_ENABLE) { 3555 sctp_misc_ints(SCTP_SACK_LOG_EXPRESS, cumack, 3556 rwnd, stcb->asoc.last_acked_seq, stcb->asoc.peers_rwnd); 3557 } 3558 SCTP_TCB_LOCK_ASSERT(stcb); 3559 #ifdef SCTP_ASOCLOG_OF_TSNS 3560 stcb->asoc.cumack_log[stcb->asoc.cumack_log_at] = cumack; 3561 stcb->asoc.cumack_log_at++; 3562 if (stcb->asoc.cumack_log_at > SCTP_TSN_LOG_SIZE) { 3563 stcb->asoc.cumack_log_at = 0; 3564 } 3565 #endif 3566 asoc = &stcb->asoc; 3567 old_rwnd = asoc->peers_rwnd; 3568 if (SCTP_TSN_GT(asoc->last_acked_seq, cumack)) { 3569 /* old ack */ 3570 return; 3571 } else if (asoc->last_acked_seq == cumack) { 3572 /* Window update sack */ 3573 asoc->peers_rwnd = sctp_sbspace_sub(rwnd, 3574 (uint32_t) (asoc->total_flight + (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)))); 3575 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 3576 /* SWS sender side engages */ 3577 asoc->peers_rwnd = 0; 3578 } 3579 if (asoc->peers_rwnd > old_rwnd) { 3580 goto again; 3581 } 3582 return; 3583 } 3584 /* First setup for CC stuff */ 3585 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 3586 if (SCTP_TSN_GT(cumack, net->cwr_window_tsn)) { 3587 /* Drag along the window_tsn for cwr's */ 3588 net->cwr_window_tsn = cumack; 3589 } 3590 net->prev_cwnd = net->cwnd; 3591 net->net_ack = 0; 3592 net->net_ack2 = 0; 3593 3594 /* 3595 * CMT: Reset CUC and Fast recovery algo variables before 3596 * SACK processing 3597 */ 3598 net->new_pseudo_cumack = 0; 3599 net->will_exit_fast_recovery = 0; 3600 if (stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack) { 3601 (*stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack) (stcb, net); 3602 } 3603 } 3604 if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) { 3605 uint32_t send_s; 3606 3607 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 3608 tp1 = TAILQ_LAST(&asoc->sent_queue, 3609 sctpchunk_listhead); 3610 send_s = tp1->rec.data.TSN_seq + 1; 3611 } else { 3612 send_s = asoc->sending_seq; 3613 } 3614 if (SCTP_TSN_GE(cumack, send_s)) { 3615 #ifndef INVARIANTS 3616 struct mbuf *op_err; 3617 char msg[SCTP_DIAG_INFO_LEN]; 3618 3619 #endif 3620 #ifdef INVARIANTS 3621 panic("Impossible sack 1"); 3622 #else 3623 3624 *abort_now = 1; 3625 /* XXX */ 3626 snprintf(msg, sizeof(msg), "Cum ack %8.8x greater or equal then TSN %8.8x", 3627 cumack, send_s); 3628 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 3629 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_25; 3630 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 3631 return; 3632 #endif 3633 } 3634 } 3635 asoc->this_sack_highest_gap = cumack; 3636 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 3637 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 3638 stcb->asoc.overall_error_count, 3639 0, 3640 SCTP_FROM_SCTP_INDATA, 3641 __LINE__); 3642 } 3643 stcb->asoc.overall_error_count = 0; 3644 if (SCTP_TSN_GT(cumack, asoc->last_acked_seq)) { 3645 /* process the new consecutive TSN first */ 3646 TAILQ_FOREACH_SAFE(tp1, &asoc->sent_queue, sctp_next, tp2) { 3647 if (SCTP_TSN_GE(cumack, tp1->rec.data.TSN_seq)) { 3648 if (tp1->sent == SCTP_DATAGRAM_UNSENT) { 3649 SCTP_PRINTF("Warning, an unsent is now acked?\n"); 3650 } 3651 if (tp1->sent < SCTP_DATAGRAM_ACKED) { 3652 /* 3653 * If it is less than ACKED, it is 3654 * now no-longer in flight. Higher 3655 * values may occur during marking 3656 */ 3657 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3658 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3659 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_CA, 3660 tp1->whoTo->flight_size, 3661 tp1->book_size, 3662 (uintptr_t) tp1->whoTo, 3663 tp1->rec.data.TSN_seq); 3664 } 3665 sctp_flight_size_decrease(tp1); 3666 if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) { 3667 (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo, 3668 tp1); 3669 } 3670 /* sa_ignore NO_NULL_CHK */ 3671 sctp_total_flight_decrease(stcb, tp1); 3672 } 3673 tp1->whoTo->net_ack += tp1->send_size; 3674 if (tp1->snd_count < 2) { 3675 /* 3676 * True non-retransmited 3677 * chunk 3678 */ 3679 tp1->whoTo->net_ack2 += 3680 tp1->send_size; 3681 3682 /* update RTO too? */ 3683 if (tp1->do_rtt) { 3684 if (rto_ok) { 3685 tp1->whoTo->RTO = 3686 /* 3687 * sa_ignore 3688 * NO_NULL_CH 3689 * K 3690 */ 3691 sctp_calculate_rto(stcb, 3692 asoc, tp1->whoTo, 3693 &tp1->sent_rcv_time, 3694 sctp_align_safe_nocopy, 3695 SCTP_RTT_FROM_DATA); 3696 rto_ok = 0; 3697 } 3698 if (tp1->whoTo->rto_needed == 0) { 3699 tp1->whoTo->rto_needed = 1; 3700 } 3701 tp1->do_rtt = 0; 3702 } 3703 } 3704 /* 3705 * CMT: CUCv2 algorithm. From the 3706 * cumack'd TSNs, for each TSN being 3707 * acked for the first time, set the 3708 * following variables for the 3709 * corresp destination. 3710 * new_pseudo_cumack will trigger a 3711 * cwnd update. 3712 * find_(rtx_)pseudo_cumack will 3713 * trigger search for the next 3714 * expected (rtx-)pseudo-cumack. 3715 */ 3716 tp1->whoTo->new_pseudo_cumack = 1; 3717 tp1->whoTo->find_pseudo_cumack = 1; 3718 tp1->whoTo->find_rtx_pseudo_cumack = 1; 3719 3720 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 3721 /* sa_ignore NO_NULL_CHK */ 3722 sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK); 3723 } 3724 } 3725 if (tp1->sent == SCTP_DATAGRAM_RESEND) { 3726 sctp_ucount_decr(asoc->sent_queue_retran_cnt); 3727 } 3728 if (tp1->rec.data.chunk_was_revoked) { 3729 /* deflate the cwnd */ 3730 tp1->whoTo->cwnd -= tp1->book_size; 3731 tp1->rec.data.chunk_was_revoked = 0; 3732 } 3733 if (tp1->sent != SCTP_DATAGRAM_NR_ACKED) { 3734 if (asoc->strmout[tp1->rec.data.stream_number].chunks_on_queues > 0) { 3735 asoc->strmout[tp1->rec.data.stream_number].chunks_on_queues--; 3736 #ifdef INVARIANTS 3737 } else { 3738 panic("No chunks on the queues for sid %u.", tp1->rec.data.stream_number); 3739 #endif 3740 } 3741 } 3742 TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next); 3743 if (tp1->data) { 3744 /* sa_ignore NO_NULL_CHK */ 3745 sctp_free_bufspace(stcb, asoc, tp1, 1); 3746 sctp_m_freem(tp1->data); 3747 tp1->data = NULL; 3748 } 3749 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 3750 sctp_log_sack(asoc->last_acked_seq, 3751 cumack, 3752 tp1->rec.data.TSN_seq, 3753 0, 3754 0, 3755 SCTP_LOG_FREE_SENT); 3756 } 3757 asoc->sent_queue_cnt--; 3758 sctp_free_a_chunk(stcb, tp1, SCTP_SO_NOT_LOCKED); 3759 } else { 3760 break; 3761 } 3762 } 3763 3764 } 3765 /* sa_ignore NO_NULL_CHK */ 3766 if (stcb->sctp_socket) { 3767 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3768 struct socket *so; 3769 3770 #endif 3771 SOCKBUF_LOCK(&stcb->sctp_socket->so_snd); 3772 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) { 3773 /* sa_ignore NO_NULL_CHK */ 3774 sctp_wakeup_log(stcb, 1, SCTP_WAKESND_FROM_SACK); 3775 } 3776 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3777 so = SCTP_INP_SO(stcb->sctp_ep); 3778 atomic_add_int(&stcb->asoc.refcnt, 1); 3779 SCTP_TCB_UNLOCK(stcb); 3780 SCTP_SOCKET_LOCK(so, 1); 3781 SCTP_TCB_LOCK(stcb); 3782 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3783 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 3784 /* assoc was freed while we were unlocked */ 3785 SCTP_SOCKET_UNLOCK(so, 1); 3786 return; 3787 } 3788 #endif 3789 sctp_sowwakeup_locked(stcb->sctp_ep, stcb->sctp_socket); 3790 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3791 SCTP_SOCKET_UNLOCK(so, 1); 3792 #endif 3793 } else { 3794 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) { 3795 sctp_wakeup_log(stcb, 1, SCTP_NOWAKE_FROM_SACK); 3796 } 3797 } 3798 3799 /* JRS - Use the congestion control given in the CC module */ 3800 if ((asoc->last_acked_seq != cumack) && (ecne_seen == 0)) { 3801 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 3802 if (net->net_ack2 > 0) { 3803 /* 3804 * Karn's rule applies to clearing error 3805 * count, this is optional. 3806 */ 3807 net->error_count = 0; 3808 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) { 3809 /* addr came good */ 3810 net->dest_state |= SCTP_ADDR_REACHABLE; 3811 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 3812 0, (void *)net, SCTP_SO_NOT_LOCKED); 3813 } 3814 if (net == stcb->asoc.primary_destination) { 3815 if (stcb->asoc.alternate) { 3816 /* 3817 * release the alternate, 3818 * primary is good 3819 */ 3820 sctp_free_remote_addr(stcb->asoc.alternate); 3821 stcb->asoc.alternate = NULL; 3822 } 3823 } 3824 if (net->dest_state & SCTP_ADDR_PF) { 3825 net->dest_state &= ~SCTP_ADDR_PF; 3826 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 3827 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 3828 asoc->cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 3829 /* Done with this net */ 3830 net->net_ack = 0; 3831 } 3832 /* restore any doubled timers */ 3833 net->RTO = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv; 3834 if (net->RTO < stcb->asoc.minrto) { 3835 net->RTO = stcb->asoc.minrto; 3836 } 3837 if (net->RTO > stcb->asoc.maxrto) { 3838 net->RTO = stcb->asoc.maxrto; 3839 } 3840 } 3841 } 3842 asoc->cc_functions.sctp_cwnd_update_after_sack(stcb, asoc, 1, 0, 0); 3843 } 3844 asoc->last_acked_seq = cumack; 3845 3846 if (TAILQ_EMPTY(&asoc->sent_queue)) { 3847 /* nothing left in-flight */ 3848 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 3849 net->flight_size = 0; 3850 net->partial_bytes_acked = 0; 3851 } 3852 asoc->total_flight = 0; 3853 asoc->total_flight_count = 0; 3854 } 3855 /* RWND update */ 3856 asoc->peers_rwnd = sctp_sbspace_sub(rwnd, 3857 (uint32_t) (asoc->total_flight + (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)))); 3858 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 3859 /* SWS sender side engages */ 3860 asoc->peers_rwnd = 0; 3861 } 3862 if (asoc->peers_rwnd > old_rwnd) { 3863 win_probe_recovery = 1; 3864 } 3865 /* Now assure a timer where data is queued at */ 3866 again: 3867 j = 0; 3868 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 3869 int to_ticks; 3870 3871 if (win_probe_recovery && (net->window_probe)) { 3872 win_probe_recovered = 1; 3873 /* 3874 * Find first chunk that was used with window probe 3875 * and clear the sent 3876 */ 3877 /* sa_ignore FREED_MEMORY */ 3878 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 3879 if (tp1->window_probe) { 3880 /* move back to data send queue */ 3881 sctp_window_probe_recovery(stcb, asoc, tp1); 3882 break; 3883 } 3884 } 3885 } 3886 if (net->RTO == 0) { 3887 to_ticks = MSEC_TO_TICKS(stcb->asoc.initial_rto); 3888 } else { 3889 to_ticks = MSEC_TO_TICKS(net->RTO); 3890 } 3891 if (net->flight_size) { 3892 j++; 3893 (void)SCTP_OS_TIMER_START(&net->rxt_timer.timer, to_ticks, 3894 sctp_timeout_handler, &net->rxt_timer); 3895 if (net->window_probe) { 3896 net->window_probe = 0; 3897 } 3898 } else { 3899 if (net->window_probe) { 3900 /* 3901 * In window probes we must assure a timer 3902 * is still running there 3903 */ 3904 net->window_probe = 0; 3905 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { 3906 SCTP_OS_TIMER_START(&net->rxt_timer.timer, to_ticks, 3907 sctp_timeout_handler, &net->rxt_timer); 3908 } 3909 } else if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { 3910 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3911 stcb, net, 3912 SCTP_FROM_SCTP_INDATA + SCTP_LOC_22); 3913 } 3914 } 3915 } 3916 if ((j == 0) && 3917 (!TAILQ_EMPTY(&asoc->sent_queue)) && 3918 (asoc->sent_queue_retran_cnt == 0) && 3919 (win_probe_recovered == 0) && 3920 (done_once == 0)) { 3921 /* 3922 * huh, this should not happen unless all packets are 3923 * PR-SCTP and marked to skip of course. 3924 */ 3925 if (sctp_fs_audit(asoc)) { 3926 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 3927 net->flight_size = 0; 3928 } 3929 asoc->total_flight = 0; 3930 asoc->total_flight_count = 0; 3931 asoc->sent_queue_retran_cnt = 0; 3932 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 3933 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3934 sctp_flight_size_increase(tp1); 3935 sctp_total_flight_increase(stcb, tp1); 3936 } else if (tp1->sent == SCTP_DATAGRAM_RESEND) { 3937 sctp_ucount_incr(asoc->sent_queue_retran_cnt); 3938 } 3939 } 3940 } 3941 done_once = 1; 3942 goto again; 3943 } 3944 /**********************************/ 3945 /* Now what about shutdown issues */ 3946 /**********************************/ 3947 if (TAILQ_EMPTY(&asoc->send_queue) && TAILQ_EMPTY(&asoc->sent_queue)) { 3948 /* nothing left on sendqueue.. consider done */ 3949 /* clean up */ 3950 if ((asoc->stream_queue_cnt == 1) && 3951 ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) || 3952 (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED)) && 3953 (asoc->locked_on_sending) 3954 ) { 3955 struct sctp_stream_queue_pending *sp; 3956 3957 /* 3958 * I may be in a state where we got all across.. but 3959 * cannot write more due to a shutdown... we abort 3960 * since the user did not indicate EOR in this case. 3961 * The sp will be cleaned during free of the asoc. 3962 */ 3963 sp = TAILQ_LAST(&((asoc->locked_on_sending)->outqueue), 3964 sctp_streamhead); 3965 if ((sp) && (sp->length == 0)) { 3966 /* Let cleanup code purge it */ 3967 if (sp->msg_is_complete) { 3968 asoc->stream_queue_cnt--; 3969 } else { 3970 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT; 3971 asoc->locked_on_sending = NULL; 3972 asoc->stream_queue_cnt--; 3973 } 3974 } 3975 } 3976 if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) && 3977 (asoc->stream_queue_cnt == 0)) { 3978 if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) { 3979 /* Need to abort here */ 3980 struct mbuf *op_err; 3981 3982 abort_out_now: 3983 *abort_now = 1; 3984 /* XXX */ 3985 op_err = sctp_generate_cause(SCTP_CAUSE_USER_INITIATED_ABT, ""); 3986 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_24; 3987 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 3988 } else { 3989 struct sctp_nets *netp; 3990 3991 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 3992 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 3993 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 3994 } 3995 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT); 3996 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 3997 sctp_stop_timers_for_shutdown(stcb); 3998 if (asoc->alternate) { 3999 netp = asoc->alternate; 4000 } else { 4001 netp = asoc->primary_destination; 4002 } 4003 sctp_send_shutdown(stcb, netp); 4004 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, 4005 stcb->sctp_ep, stcb, netp); 4006 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 4007 stcb->sctp_ep, stcb, netp); 4008 } 4009 } else if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) && 4010 (asoc->stream_queue_cnt == 0)) { 4011 struct sctp_nets *netp; 4012 4013 if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) { 4014 goto abort_out_now; 4015 } 4016 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 4017 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 4018 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 4019 sctp_stop_timers_for_shutdown(stcb); 4020 if (asoc->alternate) { 4021 netp = asoc->alternate; 4022 } else { 4023 netp = asoc->primary_destination; 4024 } 4025 sctp_send_shutdown_ack(stcb, netp); 4026 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, 4027 stcb->sctp_ep, stcb, netp); 4028 } 4029 } 4030 /*********************************************/ 4031 /* Here we perform PR-SCTP procedures */ 4032 /* (section 4.2) */ 4033 /*********************************************/ 4034 /* C1. update advancedPeerAckPoint */ 4035 if (SCTP_TSN_GT(cumack, asoc->advanced_peer_ack_point)) { 4036 asoc->advanced_peer_ack_point = cumack; 4037 } 4038 /* PR-Sctp issues need to be addressed too */ 4039 if ((asoc->prsctp_supported) && (asoc->pr_sctp_cnt > 0)) { 4040 struct sctp_tmit_chunk *lchk; 4041 uint32_t old_adv_peer_ack_point; 4042 4043 old_adv_peer_ack_point = asoc->advanced_peer_ack_point; 4044 lchk = sctp_try_advance_peer_ack_point(stcb, asoc); 4045 /* C3. See if we need to send a Fwd-TSN */ 4046 if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, cumack)) { 4047 /* 4048 * ISSUE with ECN, see FWD-TSN processing. 4049 */ 4050 if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, old_adv_peer_ack_point)) { 4051 send_forward_tsn(stcb, asoc); 4052 } else if (lchk) { 4053 /* try to FR fwd-tsn's that get lost too */ 4054 if (lchk->rec.data.fwd_tsn_cnt >= 3) { 4055 send_forward_tsn(stcb, asoc); 4056 } 4057 } 4058 } 4059 if (lchk) { 4060 /* Assure a timer is up */ 4061 sctp_timer_start(SCTP_TIMER_TYPE_SEND, 4062 stcb->sctp_ep, stcb, lchk->whoTo); 4063 } 4064 } 4065 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_RWND_LOGGING_ENABLE) { 4066 sctp_misc_ints(SCTP_SACK_RWND_UPDATE, 4067 rwnd, 4068 stcb->asoc.peers_rwnd, 4069 stcb->asoc.total_flight, 4070 stcb->asoc.total_output_queue_size); 4071 } 4072 } 4073 4074 void 4075 sctp_handle_sack(struct mbuf *m, int offset_seg, int offset_dup, 4076 struct sctp_tcb *stcb, 4077 uint16_t num_seg, uint16_t num_nr_seg, uint16_t num_dup, 4078 int *abort_now, uint8_t flags, 4079 uint32_t cum_ack, uint32_t rwnd, int ecne_seen) 4080 { 4081 struct sctp_association *asoc; 4082 struct sctp_tmit_chunk *tp1, *tp2; 4083 uint32_t last_tsn, biggest_tsn_acked, biggest_tsn_newly_acked, this_sack_lowest_newack; 4084 uint16_t wake_him = 0; 4085 uint32_t send_s = 0; 4086 long j; 4087 int accum_moved = 0; 4088 int will_exit_fast_recovery = 0; 4089 uint32_t a_rwnd, old_rwnd; 4090 int win_probe_recovery = 0; 4091 int win_probe_recovered = 0; 4092 struct sctp_nets *net = NULL; 4093 int done_once; 4094 int rto_ok = 1; 4095 uint8_t reneged_all = 0; 4096 uint8_t cmt_dac_flag; 4097 4098 /* 4099 * we take any chance we can to service our queues since we cannot 4100 * get awoken when the socket is read from :< 4101 */ 4102 /* 4103 * Now perform the actual SACK handling: 1) Verify that it is not an 4104 * old sack, if so discard. 2) If there is nothing left in the send 4105 * queue (cum-ack is equal to last acked) then you have a duplicate 4106 * too, update any rwnd change and verify no timers are running. 4107 * then return. 3) Process any new consequtive data i.e. cum-ack 4108 * moved process these first and note that it moved. 4) Process any 4109 * sack blocks. 5) Drop any acked from the queue. 6) Check for any 4110 * revoked blocks and mark. 7) Update the cwnd. 8) Nothing left, 4111 * sync up flightsizes and things, stop all timers and also check 4112 * for shutdown_pending state. If so then go ahead and send off the 4113 * shutdown. If in shutdown recv, send off the shutdown-ack and 4114 * start that timer, Ret. 9) Strike any non-acked things and do FR 4115 * procedure if needed being sure to set the FR flag. 10) Do pr-sctp 4116 * procedures. 11) Apply any FR penalties. 12) Assure we will SACK 4117 * if in shutdown_recv state. 4118 */ 4119 SCTP_TCB_LOCK_ASSERT(stcb); 4120 /* CMT DAC algo */ 4121 this_sack_lowest_newack = 0; 4122 SCTP_STAT_INCR(sctps_slowpath_sack); 4123 last_tsn = cum_ack; 4124 cmt_dac_flag = flags & SCTP_SACK_CMT_DAC; 4125 #ifdef SCTP_ASOCLOG_OF_TSNS 4126 stcb->asoc.cumack_log[stcb->asoc.cumack_log_at] = cum_ack; 4127 stcb->asoc.cumack_log_at++; 4128 if (stcb->asoc.cumack_log_at > SCTP_TSN_LOG_SIZE) { 4129 stcb->asoc.cumack_log_at = 0; 4130 } 4131 #endif 4132 a_rwnd = rwnd; 4133 4134 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_SACK_ARRIVALS_ENABLE) { 4135 sctp_misc_ints(SCTP_SACK_LOG_NORMAL, cum_ack, 4136 rwnd, stcb->asoc.last_acked_seq, stcb->asoc.peers_rwnd); 4137 } 4138 old_rwnd = stcb->asoc.peers_rwnd; 4139 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4140 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4141 stcb->asoc.overall_error_count, 4142 0, 4143 SCTP_FROM_SCTP_INDATA, 4144 __LINE__); 4145 } 4146 stcb->asoc.overall_error_count = 0; 4147 asoc = &stcb->asoc; 4148 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 4149 sctp_log_sack(asoc->last_acked_seq, 4150 cum_ack, 4151 0, 4152 num_seg, 4153 num_dup, 4154 SCTP_LOG_NEW_SACK); 4155 } 4156 if ((num_dup) && (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE)) { 4157 uint16_t i; 4158 uint32_t *dupdata, dblock; 4159 4160 for (i = 0; i < num_dup; i++) { 4161 dupdata = (uint32_t *) sctp_m_getptr(m, offset_dup + i * sizeof(uint32_t), 4162 sizeof(uint32_t), (uint8_t *) & dblock); 4163 if (dupdata == NULL) { 4164 break; 4165 } 4166 sctp_log_fr(*dupdata, 0, 0, SCTP_FR_DUPED); 4167 } 4168 } 4169 if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) { 4170 /* reality check */ 4171 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 4172 tp1 = TAILQ_LAST(&asoc->sent_queue, 4173 sctpchunk_listhead); 4174 send_s = tp1->rec.data.TSN_seq + 1; 4175 } else { 4176 tp1 = NULL; 4177 send_s = asoc->sending_seq; 4178 } 4179 if (SCTP_TSN_GE(cum_ack, send_s)) { 4180 struct mbuf *op_err; 4181 char msg[SCTP_DIAG_INFO_LEN]; 4182 4183 /* 4184 * no way, we have not even sent this TSN out yet. 4185 * Peer is hopelessly messed up with us. 4186 */ 4187 SCTP_PRINTF("NEW cum_ack:%x send_s:%x is smaller or equal\n", 4188 cum_ack, send_s); 4189 if (tp1) { 4190 SCTP_PRINTF("Got send_s from tsn:%x + 1 of tp1:%p\n", 4191 tp1->rec.data.TSN_seq, (void *)tp1); 4192 } 4193 hopeless_peer: 4194 *abort_now = 1; 4195 /* XXX */ 4196 snprintf(msg, sizeof(msg), "Cum ack %8.8x greater or equal then TSN %8.8x", 4197 cum_ack, send_s); 4198 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 4199 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_25; 4200 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 4201 return; 4202 } 4203 } 4204 /**********************/ 4205 /* 1) check the range */ 4206 /**********************/ 4207 if (SCTP_TSN_GT(asoc->last_acked_seq, last_tsn)) { 4208 /* acking something behind */ 4209 return; 4210 } 4211 /* update the Rwnd of the peer */ 4212 if (TAILQ_EMPTY(&asoc->sent_queue) && 4213 TAILQ_EMPTY(&asoc->send_queue) && 4214 (asoc->stream_queue_cnt == 0)) { 4215 /* nothing left on send/sent and strmq */ 4216 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) { 4217 sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK, 4218 asoc->peers_rwnd, 0, 0, a_rwnd); 4219 } 4220 asoc->peers_rwnd = a_rwnd; 4221 if (asoc->sent_queue_retran_cnt) { 4222 asoc->sent_queue_retran_cnt = 0; 4223 } 4224 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4225 /* SWS sender side engages */ 4226 asoc->peers_rwnd = 0; 4227 } 4228 /* stop any timers */ 4229 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4230 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 4231 stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_26); 4232 net->partial_bytes_acked = 0; 4233 net->flight_size = 0; 4234 } 4235 asoc->total_flight = 0; 4236 asoc->total_flight_count = 0; 4237 return; 4238 } 4239 /* 4240 * We init netAckSz and netAckSz2 to 0. These are used to track 2 4241 * things. The total byte count acked is tracked in netAckSz AND 4242 * netAck2 is used to track the total bytes acked that are un- 4243 * amibguious and were never retransmitted. We track these on a per 4244 * destination address basis. 4245 */ 4246 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4247 if (SCTP_TSN_GT(cum_ack, net->cwr_window_tsn)) { 4248 /* Drag along the window_tsn for cwr's */ 4249 net->cwr_window_tsn = cum_ack; 4250 } 4251 net->prev_cwnd = net->cwnd; 4252 net->net_ack = 0; 4253 net->net_ack2 = 0; 4254 4255 /* 4256 * CMT: Reset CUC and Fast recovery algo variables before 4257 * SACK processing 4258 */ 4259 net->new_pseudo_cumack = 0; 4260 net->will_exit_fast_recovery = 0; 4261 if (stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack) { 4262 (*stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack) (stcb, net); 4263 } 4264 } 4265 /* process the new consecutive TSN first */ 4266 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 4267 if (SCTP_TSN_GE(last_tsn, tp1->rec.data.TSN_seq)) { 4268 if (tp1->sent != SCTP_DATAGRAM_UNSENT) { 4269 accum_moved = 1; 4270 if (tp1->sent < SCTP_DATAGRAM_ACKED) { 4271 /* 4272 * If it is less than ACKED, it is 4273 * now no-longer in flight. Higher 4274 * values may occur during marking 4275 */ 4276 if ((tp1->whoTo->dest_state & 4277 SCTP_ADDR_UNCONFIRMED) && 4278 (tp1->snd_count < 2)) { 4279 /* 4280 * If there was no retran 4281 * and the address is 4282 * un-confirmed and we sent 4283 * there and are now 4284 * sacked.. its confirmed, 4285 * mark it so. 4286 */ 4287 tp1->whoTo->dest_state &= 4288 ~SCTP_ADDR_UNCONFIRMED; 4289 } 4290 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 4291 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 4292 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_CA, 4293 tp1->whoTo->flight_size, 4294 tp1->book_size, 4295 (uintptr_t) tp1->whoTo, 4296 tp1->rec.data.TSN_seq); 4297 } 4298 sctp_flight_size_decrease(tp1); 4299 sctp_total_flight_decrease(stcb, tp1); 4300 if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) { 4301 (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo, 4302 tp1); 4303 } 4304 } 4305 tp1->whoTo->net_ack += tp1->send_size; 4306 4307 /* CMT SFR and DAC algos */ 4308 this_sack_lowest_newack = tp1->rec.data.TSN_seq; 4309 tp1->whoTo->saw_newack = 1; 4310 4311 if (tp1->snd_count < 2) { 4312 /* 4313 * True non-retransmited 4314 * chunk 4315 */ 4316 tp1->whoTo->net_ack2 += 4317 tp1->send_size; 4318 4319 /* update RTO too? */ 4320 if (tp1->do_rtt) { 4321 if (rto_ok) { 4322 tp1->whoTo->RTO = 4323 sctp_calculate_rto(stcb, 4324 asoc, tp1->whoTo, 4325 &tp1->sent_rcv_time, 4326 sctp_align_safe_nocopy, 4327 SCTP_RTT_FROM_DATA); 4328 rto_ok = 0; 4329 } 4330 if (tp1->whoTo->rto_needed == 0) { 4331 tp1->whoTo->rto_needed = 1; 4332 } 4333 tp1->do_rtt = 0; 4334 } 4335 } 4336 /* 4337 * CMT: CUCv2 algorithm. From the 4338 * cumack'd TSNs, for each TSN being 4339 * acked for the first time, set the 4340 * following variables for the 4341 * corresp destination. 4342 * new_pseudo_cumack will trigger a 4343 * cwnd update. 4344 * find_(rtx_)pseudo_cumack will 4345 * trigger search for the next 4346 * expected (rtx-)pseudo-cumack. 4347 */ 4348 tp1->whoTo->new_pseudo_cumack = 1; 4349 tp1->whoTo->find_pseudo_cumack = 1; 4350 tp1->whoTo->find_rtx_pseudo_cumack = 1; 4351 4352 4353 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 4354 sctp_log_sack(asoc->last_acked_seq, 4355 cum_ack, 4356 tp1->rec.data.TSN_seq, 4357 0, 4358 0, 4359 SCTP_LOG_TSN_ACKED); 4360 } 4361 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 4362 sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK); 4363 } 4364 } 4365 if (tp1->sent == SCTP_DATAGRAM_RESEND) { 4366 sctp_ucount_decr(asoc->sent_queue_retran_cnt); 4367 #ifdef SCTP_AUDITING_ENABLED 4368 sctp_audit_log(0xB3, 4369 (asoc->sent_queue_retran_cnt & 0x000000ff)); 4370 #endif 4371 } 4372 if (tp1->rec.data.chunk_was_revoked) { 4373 /* deflate the cwnd */ 4374 tp1->whoTo->cwnd -= tp1->book_size; 4375 tp1->rec.data.chunk_was_revoked = 0; 4376 } 4377 if (tp1->sent != SCTP_DATAGRAM_NR_ACKED) { 4378 tp1->sent = SCTP_DATAGRAM_ACKED; 4379 } 4380 } 4381 } else { 4382 break; 4383 } 4384 } 4385 biggest_tsn_newly_acked = biggest_tsn_acked = last_tsn; 4386 /* always set this up to cum-ack */ 4387 asoc->this_sack_highest_gap = last_tsn; 4388 4389 if ((num_seg > 0) || (num_nr_seg > 0)) { 4390 4391 /* 4392 * CMT: SFR algo (and HTNA) - this_sack_highest_newack has 4393 * to be greater than the cumack. Also reset saw_newack to 0 4394 * for all dests. 4395 */ 4396 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4397 net->saw_newack = 0; 4398 net->this_sack_highest_newack = last_tsn; 4399 } 4400 4401 /* 4402 * thisSackHighestGap will increase while handling NEW 4403 * segments this_sack_highest_newack will increase while 4404 * handling NEWLY ACKED chunks. this_sack_lowest_newack is 4405 * used for CMT DAC algo. saw_newack will also change. 4406 */ 4407 if (sctp_handle_segments(m, &offset_seg, stcb, asoc, last_tsn, &biggest_tsn_acked, 4408 &biggest_tsn_newly_acked, &this_sack_lowest_newack, 4409 num_seg, num_nr_seg, &rto_ok)) { 4410 wake_him++; 4411 } 4412 if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) { 4413 /* 4414 * validate the biggest_tsn_acked in the gap acks if 4415 * strict adherence is wanted. 4416 */ 4417 if (SCTP_TSN_GE(biggest_tsn_acked, send_s)) { 4418 /* 4419 * peer is either confused or we are under 4420 * attack. We must abort. 4421 */ 4422 SCTP_PRINTF("Hopeless peer! biggest_tsn_acked:%x largest seq:%x\n", 4423 biggest_tsn_acked, send_s); 4424 goto hopeless_peer; 4425 } 4426 } 4427 } 4428 /*******************************************/ 4429 /* cancel ALL T3-send timer if accum moved */ 4430 /*******************************************/ 4431 if (asoc->sctp_cmt_on_off > 0) { 4432 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4433 if (net->new_pseudo_cumack) 4434 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 4435 stcb, net, 4436 SCTP_FROM_SCTP_INDATA + SCTP_LOC_27); 4437 4438 } 4439 } else { 4440 if (accum_moved) { 4441 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4442 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 4443 stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_28); 4444 } 4445 } 4446 } 4447 /********************************************/ 4448 /* drop the acked chunks from the sentqueue */ 4449 /********************************************/ 4450 asoc->last_acked_seq = cum_ack; 4451 4452 TAILQ_FOREACH_SAFE(tp1, &asoc->sent_queue, sctp_next, tp2) { 4453 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, cum_ack)) { 4454 break; 4455 } 4456 if (tp1->sent != SCTP_DATAGRAM_NR_ACKED) { 4457 if (asoc->strmout[tp1->rec.data.stream_number].chunks_on_queues > 0) { 4458 asoc->strmout[tp1->rec.data.stream_number].chunks_on_queues--; 4459 #ifdef INVARIANTS 4460 } else { 4461 panic("No chunks on the queues for sid %u.", tp1->rec.data.stream_number); 4462 #endif 4463 } 4464 } 4465 TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next); 4466 if (PR_SCTP_ENABLED(tp1->flags)) { 4467 if (asoc->pr_sctp_cnt != 0) 4468 asoc->pr_sctp_cnt--; 4469 } 4470 asoc->sent_queue_cnt--; 4471 if (tp1->data) { 4472 /* sa_ignore NO_NULL_CHK */ 4473 sctp_free_bufspace(stcb, asoc, tp1, 1); 4474 sctp_m_freem(tp1->data); 4475 tp1->data = NULL; 4476 if (asoc->prsctp_supported && PR_SCTP_BUF_ENABLED(tp1->flags)) { 4477 asoc->sent_queue_cnt_removeable--; 4478 } 4479 } 4480 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 4481 sctp_log_sack(asoc->last_acked_seq, 4482 cum_ack, 4483 tp1->rec.data.TSN_seq, 4484 0, 4485 0, 4486 SCTP_LOG_FREE_SENT); 4487 } 4488 sctp_free_a_chunk(stcb, tp1, SCTP_SO_NOT_LOCKED); 4489 wake_him++; 4490 } 4491 if (TAILQ_EMPTY(&asoc->sent_queue) && (asoc->total_flight > 0)) { 4492 #ifdef INVARIANTS 4493 panic("Warning flight size is postive and should be 0"); 4494 #else 4495 SCTP_PRINTF("Warning flight size incorrect should be 0 is %d\n", 4496 asoc->total_flight); 4497 #endif 4498 asoc->total_flight = 0; 4499 } 4500 /* sa_ignore NO_NULL_CHK */ 4501 if ((wake_him) && (stcb->sctp_socket)) { 4502 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4503 struct socket *so; 4504 4505 #endif 4506 SOCKBUF_LOCK(&stcb->sctp_socket->so_snd); 4507 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) { 4508 sctp_wakeup_log(stcb, wake_him, SCTP_WAKESND_FROM_SACK); 4509 } 4510 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4511 so = SCTP_INP_SO(stcb->sctp_ep); 4512 atomic_add_int(&stcb->asoc.refcnt, 1); 4513 SCTP_TCB_UNLOCK(stcb); 4514 SCTP_SOCKET_LOCK(so, 1); 4515 SCTP_TCB_LOCK(stcb); 4516 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4517 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 4518 /* assoc was freed while we were unlocked */ 4519 SCTP_SOCKET_UNLOCK(so, 1); 4520 return; 4521 } 4522 #endif 4523 sctp_sowwakeup_locked(stcb->sctp_ep, stcb->sctp_socket); 4524 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4525 SCTP_SOCKET_UNLOCK(so, 1); 4526 #endif 4527 } else { 4528 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) { 4529 sctp_wakeup_log(stcb, wake_him, SCTP_NOWAKE_FROM_SACK); 4530 } 4531 } 4532 4533 if (asoc->fast_retran_loss_recovery && accum_moved) { 4534 if (SCTP_TSN_GE(asoc->last_acked_seq, asoc->fast_recovery_tsn)) { 4535 /* Setup so we will exit RFC2582 fast recovery */ 4536 will_exit_fast_recovery = 1; 4537 } 4538 } 4539 /* 4540 * Check for revoked fragments: 4541 * 4542 * if Previous sack - Had no frags then we can't have any revoked if 4543 * Previous sack - Had frag's then - If we now have frags aka 4544 * num_seg > 0 call sctp_check_for_revoked() to tell if peer revoked 4545 * some of them. else - The peer revoked all ACKED fragments, since 4546 * we had some before and now we have NONE. 4547 */ 4548 4549 if (num_seg) { 4550 sctp_check_for_revoked(stcb, asoc, cum_ack, biggest_tsn_acked); 4551 asoc->saw_sack_with_frags = 1; 4552 } else if (asoc->saw_sack_with_frags) { 4553 int cnt_revoked = 0; 4554 4555 /* Peer revoked all dg's marked or acked */ 4556 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 4557 if (tp1->sent == SCTP_DATAGRAM_ACKED) { 4558 tp1->sent = SCTP_DATAGRAM_SENT; 4559 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 4560 sctp_misc_ints(SCTP_FLIGHT_LOG_UP_REVOKE, 4561 tp1->whoTo->flight_size, 4562 tp1->book_size, 4563 (uintptr_t) tp1->whoTo, 4564 tp1->rec.data.TSN_seq); 4565 } 4566 sctp_flight_size_increase(tp1); 4567 sctp_total_flight_increase(stcb, tp1); 4568 tp1->rec.data.chunk_was_revoked = 1; 4569 /* 4570 * To ensure that this increase in 4571 * flightsize, which is artificial, does not 4572 * throttle the sender, we also increase the 4573 * cwnd artificially. 4574 */ 4575 tp1->whoTo->cwnd += tp1->book_size; 4576 cnt_revoked++; 4577 } 4578 } 4579 if (cnt_revoked) { 4580 reneged_all = 1; 4581 } 4582 asoc->saw_sack_with_frags = 0; 4583 } 4584 if (num_nr_seg > 0) 4585 asoc->saw_sack_with_nr_frags = 1; 4586 else 4587 asoc->saw_sack_with_nr_frags = 0; 4588 4589 /* JRS - Use the congestion control given in the CC module */ 4590 if (ecne_seen == 0) { 4591 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4592 if (net->net_ack2 > 0) { 4593 /* 4594 * Karn's rule applies to clearing error 4595 * count, this is optional. 4596 */ 4597 net->error_count = 0; 4598 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) { 4599 /* addr came good */ 4600 net->dest_state |= SCTP_ADDR_REACHABLE; 4601 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 4602 0, (void *)net, SCTP_SO_NOT_LOCKED); 4603 } 4604 if (net == stcb->asoc.primary_destination) { 4605 if (stcb->asoc.alternate) { 4606 /* 4607 * release the alternate, 4608 * primary is good 4609 */ 4610 sctp_free_remote_addr(stcb->asoc.alternate); 4611 stcb->asoc.alternate = NULL; 4612 } 4613 } 4614 if (net->dest_state & SCTP_ADDR_PF) { 4615 net->dest_state &= ~SCTP_ADDR_PF; 4616 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 4617 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 4618 asoc->cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 4619 /* Done with this net */ 4620 net->net_ack = 0; 4621 } 4622 /* restore any doubled timers */ 4623 net->RTO = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv; 4624 if (net->RTO < stcb->asoc.minrto) { 4625 net->RTO = stcb->asoc.minrto; 4626 } 4627 if (net->RTO > stcb->asoc.maxrto) { 4628 net->RTO = stcb->asoc.maxrto; 4629 } 4630 } 4631 } 4632 asoc->cc_functions.sctp_cwnd_update_after_sack(stcb, asoc, accum_moved, reneged_all, will_exit_fast_recovery); 4633 } 4634 if (TAILQ_EMPTY(&asoc->sent_queue)) { 4635 /* nothing left in-flight */ 4636 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4637 /* stop all timers */ 4638 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 4639 stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_30); 4640 net->flight_size = 0; 4641 net->partial_bytes_acked = 0; 4642 } 4643 asoc->total_flight = 0; 4644 asoc->total_flight_count = 0; 4645 } 4646 /**********************************/ 4647 /* Now what about shutdown issues */ 4648 /**********************************/ 4649 if (TAILQ_EMPTY(&asoc->send_queue) && TAILQ_EMPTY(&asoc->sent_queue)) { 4650 /* nothing left on sendqueue.. consider done */ 4651 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) { 4652 sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK, 4653 asoc->peers_rwnd, 0, 0, a_rwnd); 4654 } 4655 asoc->peers_rwnd = a_rwnd; 4656 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4657 /* SWS sender side engages */ 4658 asoc->peers_rwnd = 0; 4659 } 4660 /* clean up */ 4661 if ((asoc->stream_queue_cnt == 1) && 4662 ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) || 4663 (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED)) && 4664 (asoc->locked_on_sending) 4665 ) { 4666 struct sctp_stream_queue_pending *sp; 4667 4668 /* 4669 * I may be in a state where we got all across.. but 4670 * cannot write more due to a shutdown... we abort 4671 * since the user did not indicate EOR in this case. 4672 */ 4673 sp = TAILQ_LAST(&((asoc->locked_on_sending)->outqueue), 4674 sctp_streamhead); 4675 if ((sp) && (sp->length == 0)) { 4676 asoc->locked_on_sending = NULL; 4677 if (sp->msg_is_complete) { 4678 asoc->stream_queue_cnt--; 4679 } else { 4680 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT; 4681 asoc->stream_queue_cnt--; 4682 } 4683 } 4684 } 4685 if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) && 4686 (asoc->stream_queue_cnt == 0)) { 4687 if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) { 4688 /* Need to abort here */ 4689 struct mbuf *op_err; 4690 4691 abort_out_now: 4692 *abort_now = 1; 4693 /* XXX */ 4694 op_err = sctp_generate_cause(SCTP_CAUSE_USER_INITIATED_ABT, ""); 4695 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_31; 4696 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 4697 return; 4698 } else { 4699 struct sctp_nets *netp; 4700 4701 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 4702 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 4703 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 4704 } 4705 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT); 4706 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 4707 sctp_stop_timers_for_shutdown(stcb); 4708 if (asoc->alternate) { 4709 netp = asoc->alternate; 4710 } else { 4711 netp = asoc->primary_destination; 4712 } 4713 sctp_send_shutdown(stcb, netp); 4714 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, 4715 stcb->sctp_ep, stcb, netp); 4716 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 4717 stcb->sctp_ep, stcb, netp); 4718 } 4719 return; 4720 } else if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) && 4721 (asoc->stream_queue_cnt == 0)) { 4722 struct sctp_nets *netp; 4723 4724 if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) { 4725 goto abort_out_now; 4726 } 4727 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 4728 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 4729 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 4730 sctp_stop_timers_for_shutdown(stcb); 4731 if (asoc->alternate) { 4732 netp = asoc->alternate; 4733 } else { 4734 netp = asoc->primary_destination; 4735 } 4736 sctp_send_shutdown_ack(stcb, netp); 4737 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, 4738 stcb->sctp_ep, stcb, netp); 4739 return; 4740 } 4741 } 4742 /* 4743 * Now here we are going to recycle net_ack for a different use... 4744 * HEADS UP. 4745 */ 4746 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4747 net->net_ack = 0; 4748 } 4749 4750 /* 4751 * CMT DAC algorithm: If SACK DAC flag was 0, then no extra marking 4752 * to be done. Setting this_sack_lowest_newack to the cum_ack will 4753 * automatically ensure that. 4754 */ 4755 if ((asoc->sctp_cmt_on_off > 0) && 4756 SCTP_BASE_SYSCTL(sctp_cmt_use_dac) && 4757 (cmt_dac_flag == 0)) { 4758 this_sack_lowest_newack = cum_ack; 4759 } 4760 if ((num_seg > 0) || (num_nr_seg > 0)) { 4761 sctp_strike_gap_ack_chunks(stcb, asoc, biggest_tsn_acked, 4762 biggest_tsn_newly_acked, this_sack_lowest_newack, accum_moved); 4763 } 4764 /* JRS - Use the congestion control given in the CC module */ 4765 asoc->cc_functions.sctp_cwnd_update_after_fr(stcb, asoc); 4766 4767 /* Now are we exiting loss recovery ? */ 4768 if (will_exit_fast_recovery) { 4769 /* Ok, we must exit fast recovery */ 4770 asoc->fast_retran_loss_recovery = 0; 4771 } 4772 if ((asoc->sat_t3_loss_recovery) && 4773 SCTP_TSN_GE(asoc->last_acked_seq, asoc->sat_t3_recovery_tsn)) { 4774 /* end satellite t3 loss recovery */ 4775 asoc->sat_t3_loss_recovery = 0; 4776 } 4777 /* 4778 * CMT Fast recovery 4779 */ 4780 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4781 if (net->will_exit_fast_recovery) { 4782 /* Ok, we must exit fast recovery */ 4783 net->fast_retran_loss_recovery = 0; 4784 } 4785 } 4786 4787 /* Adjust and set the new rwnd value */ 4788 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) { 4789 sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK, 4790 asoc->peers_rwnd, asoc->total_flight, (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)), a_rwnd); 4791 } 4792 asoc->peers_rwnd = sctp_sbspace_sub(a_rwnd, 4793 (uint32_t) (asoc->total_flight + (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)))); 4794 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4795 /* SWS sender side engages */ 4796 asoc->peers_rwnd = 0; 4797 } 4798 if (asoc->peers_rwnd > old_rwnd) { 4799 win_probe_recovery = 1; 4800 } 4801 /* 4802 * Now we must setup so we have a timer up for anyone with 4803 * outstanding data. 4804 */ 4805 done_once = 0; 4806 again: 4807 j = 0; 4808 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4809 if (win_probe_recovery && (net->window_probe)) { 4810 win_probe_recovered = 1; 4811 /*- 4812 * Find first chunk that was used with 4813 * window probe and clear the event. Put 4814 * it back into the send queue as if has 4815 * not been sent. 4816 */ 4817 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 4818 if (tp1->window_probe) { 4819 sctp_window_probe_recovery(stcb, asoc, tp1); 4820 break; 4821 } 4822 } 4823 } 4824 if (net->flight_size) { 4825 j++; 4826 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { 4827 sctp_timer_start(SCTP_TIMER_TYPE_SEND, 4828 stcb->sctp_ep, stcb, net); 4829 } 4830 if (net->window_probe) { 4831 net->window_probe = 0; 4832 } 4833 } else { 4834 if (net->window_probe) { 4835 /* 4836 * In window probes we must assure a timer 4837 * is still running there 4838 */ 4839 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { 4840 sctp_timer_start(SCTP_TIMER_TYPE_SEND, 4841 stcb->sctp_ep, stcb, net); 4842 4843 } 4844 } else if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { 4845 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 4846 stcb, net, 4847 SCTP_FROM_SCTP_INDATA + SCTP_LOC_22); 4848 } 4849 } 4850 } 4851 if ((j == 0) && 4852 (!TAILQ_EMPTY(&asoc->sent_queue)) && 4853 (asoc->sent_queue_retran_cnt == 0) && 4854 (win_probe_recovered == 0) && 4855 (done_once == 0)) { 4856 /* 4857 * huh, this should not happen unless all packets are 4858 * PR-SCTP and marked to skip of course. 4859 */ 4860 if (sctp_fs_audit(asoc)) { 4861 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4862 net->flight_size = 0; 4863 } 4864 asoc->total_flight = 0; 4865 asoc->total_flight_count = 0; 4866 asoc->sent_queue_retran_cnt = 0; 4867 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 4868 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 4869 sctp_flight_size_increase(tp1); 4870 sctp_total_flight_increase(stcb, tp1); 4871 } else if (tp1->sent == SCTP_DATAGRAM_RESEND) { 4872 sctp_ucount_incr(asoc->sent_queue_retran_cnt); 4873 } 4874 } 4875 } 4876 done_once = 1; 4877 goto again; 4878 } 4879 /*********************************************/ 4880 /* Here we perform PR-SCTP procedures */ 4881 /* (section 4.2) */ 4882 /*********************************************/ 4883 /* C1. update advancedPeerAckPoint */ 4884 if (SCTP_TSN_GT(cum_ack, asoc->advanced_peer_ack_point)) { 4885 asoc->advanced_peer_ack_point = cum_ack; 4886 } 4887 /* C2. try to further move advancedPeerAckPoint ahead */ 4888 if ((asoc->prsctp_supported) && (asoc->pr_sctp_cnt > 0)) { 4889 struct sctp_tmit_chunk *lchk; 4890 uint32_t old_adv_peer_ack_point; 4891 4892 old_adv_peer_ack_point = asoc->advanced_peer_ack_point; 4893 lchk = sctp_try_advance_peer_ack_point(stcb, asoc); 4894 /* C3. See if we need to send a Fwd-TSN */ 4895 if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, cum_ack)) { 4896 /* 4897 * ISSUE with ECN, see FWD-TSN processing. 4898 */ 4899 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) { 4900 sctp_misc_ints(SCTP_FWD_TSN_CHECK, 4901 0xee, cum_ack, asoc->advanced_peer_ack_point, 4902 old_adv_peer_ack_point); 4903 } 4904 if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, old_adv_peer_ack_point)) { 4905 send_forward_tsn(stcb, asoc); 4906 } else if (lchk) { 4907 /* try to FR fwd-tsn's that get lost too */ 4908 if (lchk->rec.data.fwd_tsn_cnt >= 3) { 4909 send_forward_tsn(stcb, asoc); 4910 } 4911 } 4912 } 4913 if (lchk) { 4914 /* Assure a timer is up */ 4915 sctp_timer_start(SCTP_TIMER_TYPE_SEND, 4916 stcb->sctp_ep, stcb, lchk->whoTo); 4917 } 4918 } 4919 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_RWND_LOGGING_ENABLE) { 4920 sctp_misc_ints(SCTP_SACK_RWND_UPDATE, 4921 a_rwnd, 4922 stcb->asoc.peers_rwnd, 4923 stcb->asoc.total_flight, 4924 stcb->asoc.total_output_queue_size); 4925 } 4926 } 4927 4928 void 4929 sctp_update_acked(struct sctp_tcb *stcb, struct sctp_shutdown_chunk *cp, int *abort_flag) 4930 { 4931 /* Copy cum-ack */ 4932 uint32_t cum_ack, a_rwnd; 4933 4934 cum_ack = ntohl(cp->cumulative_tsn_ack); 4935 /* Arrange so a_rwnd does NOT change */ 4936 a_rwnd = stcb->asoc.peers_rwnd + stcb->asoc.total_flight; 4937 4938 /* Now call the express sack handling */ 4939 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, abort_flag, 0); 4940 } 4941 4942 static void 4943 sctp_kick_prsctp_reorder_queue(struct sctp_tcb *stcb, 4944 struct sctp_stream_in *strmin) 4945 { 4946 struct sctp_queued_to_read *ctl, *nctl; 4947 struct sctp_association *asoc; 4948 uint16_t tt; 4949 4950 asoc = &stcb->asoc; 4951 tt = strmin->last_sequence_delivered; 4952 /* 4953 * First deliver anything prior to and including the stream no that 4954 * came in 4955 */ 4956 TAILQ_FOREACH_SAFE(ctl, &strmin->inqueue, next, nctl) { 4957 if (SCTP_SSN_GE(tt, ctl->sinfo_ssn)) { 4958 /* this is deliverable now */ 4959 TAILQ_REMOVE(&strmin->inqueue, ctl, next); 4960 /* subtract pending on streams */ 4961 asoc->size_on_all_streams -= ctl->length; 4962 sctp_ucount_decr(asoc->cnt_on_all_streams); 4963 /* deliver it to at least the delivery-q */ 4964 if (stcb->sctp_socket) { 4965 sctp_mark_non_revokable(asoc, ctl->sinfo_tsn); 4966 sctp_add_to_readq(stcb->sctp_ep, stcb, 4967 ctl, 4968 &stcb->sctp_socket->so_rcv, 1, SCTP_READ_LOCK_HELD, SCTP_SO_NOT_LOCKED); 4969 } 4970 } else { 4971 /* no more delivery now. */ 4972 break; 4973 } 4974 } 4975 /* 4976 * now we must deliver things in queue the normal way if any are 4977 * now ready. 4978 */ 4979 tt = strmin->last_sequence_delivered + 1; 4980 TAILQ_FOREACH_SAFE(ctl, &strmin->inqueue, next, nctl) { 4981 if (tt == ctl->sinfo_ssn) { 4982 /* this is deliverable now */ 4983 TAILQ_REMOVE(&strmin->inqueue, ctl, next); 4984 /* subtract pending on streams */ 4985 asoc->size_on_all_streams -= ctl->length; 4986 sctp_ucount_decr(asoc->cnt_on_all_streams); 4987 /* deliver it to at least the delivery-q */ 4988 strmin->last_sequence_delivered = ctl->sinfo_ssn; 4989 if (stcb->sctp_socket) { 4990 sctp_mark_non_revokable(asoc, ctl->sinfo_tsn); 4991 sctp_add_to_readq(stcb->sctp_ep, stcb, 4992 ctl, 4993 &stcb->sctp_socket->so_rcv, 1, SCTP_READ_LOCK_HELD, SCTP_SO_NOT_LOCKED); 4994 4995 } 4996 tt = strmin->last_sequence_delivered + 1; 4997 } else { 4998 break; 4999 } 5000 } 5001 } 5002 5003 static void 5004 sctp_flush_reassm_for_str_seq(struct sctp_tcb *stcb, 5005 struct sctp_association *asoc, 5006 uint16_t stream, uint16_t seq) 5007 { 5008 struct sctp_tmit_chunk *chk, *nchk; 5009 5010 /* For each one on here see if we need to toss it */ 5011 /* 5012 * For now large messages held on the reasmqueue that are complete 5013 * will be tossed too. We could in theory do more work to spin 5014 * through and stop after dumping one msg aka seeing the start of a 5015 * new msg at the head, and call the delivery function... to see if 5016 * it can be delivered... But for now we just dump everything on the 5017 * queue. 5018 */ 5019 TAILQ_FOREACH_SAFE(chk, &asoc->reasmqueue, sctp_next, nchk) { 5020 /* 5021 * Do not toss it if on a different stream or marked for 5022 * unordered delivery in which case the stream sequence 5023 * number has no meaning. 5024 */ 5025 if ((chk->rec.data.stream_number != stream) || 5026 ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == SCTP_DATA_UNORDERED)) { 5027 continue; 5028 } 5029 if (chk->rec.data.stream_seq == seq) { 5030 /* It needs to be tossed */ 5031 TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next); 5032 if (SCTP_TSN_GT(chk->rec.data.TSN_seq, asoc->tsn_last_delivered)) { 5033 asoc->tsn_last_delivered = chk->rec.data.TSN_seq; 5034 asoc->str_of_pdapi = chk->rec.data.stream_number; 5035 asoc->ssn_of_pdapi = chk->rec.data.stream_seq; 5036 asoc->fragment_flags = chk->rec.data.rcv_flags; 5037 } 5038 asoc->size_on_reasm_queue -= chk->send_size; 5039 sctp_ucount_decr(asoc->cnt_on_reasm_queue); 5040 5041 /* Clear up any stream problem */ 5042 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) != SCTP_DATA_UNORDERED && 5043 SCTP_SSN_GT(chk->rec.data.stream_seq, asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered)) { 5044 /* 5045 * We must dump forward this streams 5046 * sequence number if the chunk is not 5047 * unordered that is being skipped. There is 5048 * a chance that if the peer does not 5049 * include the last fragment in its FWD-TSN 5050 * we WILL have a problem here since you 5051 * would have a partial chunk in queue that 5052 * may not be deliverable. Also if a Partial 5053 * delivery API as started the user may get 5054 * a partial chunk. The next read returning 5055 * a new chunk... really ugly but I see no 5056 * way around it! Maybe a notify?? 5057 */ 5058 asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered = chk->rec.data.stream_seq; 5059 } 5060 if (chk->data) { 5061 sctp_m_freem(chk->data); 5062 chk->data = NULL; 5063 } 5064 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 5065 } else if (SCTP_SSN_GT(chk->rec.data.stream_seq, seq)) { 5066 /* 5067 * If the stream_seq is > than the purging one, we 5068 * are done 5069 */ 5070 break; 5071 } 5072 } 5073 } 5074 5075 5076 void 5077 sctp_handle_forward_tsn(struct sctp_tcb *stcb, 5078 struct sctp_forward_tsn_chunk *fwd, 5079 int *abort_flag, struct mbuf *m, int offset) 5080 { 5081 /* The pr-sctp fwd tsn */ 5082 /* 5083 * here we will perform all the data receiver side steps for 5084 * processing FwdTSN, as required in by pr-sctp draft: 5085 * 5086 * Assume we get FwdTSN(x): 5087 * 5088 * 1) update local cumTSN to x 2) try to further advance cumTSN to x + 5089 * others we have 3) examine and update re-ordering queue on 5090 * pr-in-streams 4) clean up re-assembly queue 5) Send a sack to 5091 * report where we are. 5092 */ 5093 struct sctp_association *asoc; 5094 uint32_t new_cum_tsn, gap; 5095 unsigned int i, fwd_sz, m_size; 5096 uint32_t str_seq; 5097 struct sctp_stream_in *strm; 5098 struct sctp_tmit_chunk *chk, *nchk; 5099 struct sctp_queued_to_read *ctl, *sv; 5100 5101 asoc = &stcb->asoc; 5102 if ((fwd_sz = ntohs(fwd->ch.chunk_length)) < sizeof(struct sctp_forward_tsn_chunk)) { 5103 SCTPDBG(SCTP_DEBUG_INDATA1, 5104 "Bad size too small/big fwd-tsn\n"); 5105 return; 5106 } 5107 m_size = (stcb->asoc.mapping_array_size << 3); 5108 /*************************************************************/ 5109 /* 1. Here we update local cumTSN and shift the bitmap array */ 5110 /*************************************************************/ 5111 new_cum_tsn = ntohl(fwd->new_cumulative_tsn); 5112 5113 if (SCTP_TSN_GE(asoc->cumulative_tsn, new_cum_tsn)) { 5114 /* Already got there ... */ 5115 return; 5116 } 5117 /* 5118 * now we know the new TSN is more advanced, let's find the actual 5119 * gap 5120 */ 5121 SCTP_CALC_TSN_TO_GAP(gap, new_cum_tsn, asoc->mapping_array_base_tsn); 5122 asoc->cumulative_tsn = new_cum_tsn; 5123 if (gap >= m_size) { 5124 if ((long)gap > sctp_sbspace(&stcb->asoc, &stcb->sctp_socket->so_rcv)) { 5125 struct mbuf *op_err; 5126 char msg[SCTP_DIAG_INFO_LEN]; 5127 5128 /* 5129 * out of range (of single byte chunks in the rwnd I 5130 * give out). This must be an attacker. 5131 */ 5132 *abort_flag = 1; 5133 snprintf(msg, sizeof(msg), 5134 "New cum ack %8.8x too high, highest TSN %8.8x", 5135 new_cum_tsn, asoc->highest_tsn_inside_map); 5136 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 5137 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_33; 5138 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 5139 return; 5140 } 5141 SCTP_STAT_INCR(sctps_fwdtsn_map_over); 5142 5143 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 5144 asoc->mapping_array_base_tsn = new_cum_tsn + 1; 5145 asoc->highest_tsn_inside_map = new_cum_tsn; 5146 5147 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 5148 asoc->highest_tsn_inside_nr_map = new_cum_tsn; 5149 5150 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 5151 sctp_log_map(0, 3, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 5152 } 5153 } else { 5154 SCTP_TCB_LOCK_ASSERT(stcb); 5155 for (i = 0; i <= gap; i++) { 5156 if (!SCTP_IS_TSN_PRESENT(asoc->mapping_array, i) && 5157 !SCTP_IS_TSN_PRESENT(asoc->nr_mapping_array, i)) { 5158 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, i); 5159 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn + i, asoc->highest_tsn_inside_nr_map)) { 5160 asoc->highest_tsn_inside_nr_map = asoc->mapping_array_base_tsn + i; 5161 } 5162 } 5163 } 5164 } 5165 /*************************************************************/ 5166 /* 2. Clear up re-assembly queue */ 5167 /*************************************************************/ 5168 /* 5169 * First service it if pd-api is up, just in case we can progress it 5170 * forward 5171 */ 5172 if (asoc->fragmented_delivery_inprogress) { 5173 sctp_service_reassembly(stcb, asoc); 5174 } 5175 /* For each one on here see if we need to toss it */ 5176 /* 5177 * For now large messages held on the reasmqueue that are complete 5178 * will be tossed too. We could in theory do more work to spin 5179 * through and stop after dumping one msg aka seeing the start of a 5180 * new msg at the head, and call the delivery function... to see if 5181 * it can be delivered... But for now we just dump everything on the 5182 * queue. 5183 */ 5184 TAILQ_FOREACH_SAFE(chk, &asoc->reasmqueue, sctp_next, nchk) { 5185 if (SCTP_TSN_GE(new_cum_tsn, chk->rec.data.TSN_seq)) { 5186 /* It needs to be tossed */ 5187 TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next); 5188 if (SCTP_TSN_GT(chk->rec.data.TSN_seq, asoc->tsn_last_delivered)) { 5189 asoc->tsn_last_delivered = chk->rec.data.TSN_seq; 5190 asoc->str_of_pdapi = chk->rec.data.stream_number; 5191 asoc->ssn_of_pdapi = chk->rec.data.stream_seq; 5192 asoc->fragment_flags = chk->rec.data.rcv_flags; 5193 } 5194 asoc->size_on_reasm_queue -= chk->send_size; 5195 sctp_ucount_decr(asoc->cnt_on_reasm_queue); 5196 5197 /* Clear up any stream problem */ 5198 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) != SCTP_DATA_UNORDERED && 5199 SCTP_SSN_GT(chk->rec.data.stream_seq, asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered)) { 5200 /* 5201 * We must dump forward this streams 5202 * sequence number if the chunk is not 5203 * unordered that is being skipped. There is 5204 * a chance that if the peer does not 5205 * include the last fragment in its FWD-TSN 5206 * we WILL have a problem here since you 5207 * would have a partial chunk in queue that 5208 * may not be deliverable. Also if a Partial 5209 * delivery API as started the user may get 5210 * a partial chunk. The next read returning 5211 * a new chunk... really ugly but I see no 5212 * way around it! Maybe a notify?? 5213 */ 5214 asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered = chk->rec.data.stream_seq; 5215 } 5216 if (chk->data) { 5217 sctp_m_freem(chk->data); 5218 chk->data = NULL; 5219 } 5220 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 5221 } else { 5222 /* 5223 * Ok we have gone beyond the end of the fwd-tsn's 5224 * mark. 5225 */ 5226 break; 5227 } 5228 } 5229 /*******************************************************/ 5230 /* 3. Update the PR-stream re-ordering queues and fix */ 5231 /* delivery issues as needed. */ 5232 /*******************************************************/ 5233 fwd_sz -= sizeof(*fwd); 5234 if (m && fwd_sz) { 5235 /* New method. */ 5236 unsigned int num_str; 5237 struct sctp_strseq *stseq, strseqbuf; 5238 5239 offset += sizeof(*fwd); 5240 5241 SCTP_INP_READ_LOCK(stcb->sctp_ep); 5242 num_str = fwd_sz / sizeof(struct sctp_strseq); 5243 for (i = 0; i < num_str; i++) { 5244 uint16_t st; 5245 5246 stseq = (struct sctp_strseq *)sctp_m_getptr(m, offset, 5247 sizeof(struct sctp_strseq), 5248 (uint8_t *) & strseqbuf); 5249 offset += sizeof(struct sctp_strseq); 5250 if (stseq == NULL) { 5251 break; 5252 } 5253 /* Convert */ 5254 st = ntohs(stseq->stream); 5255 stseq->stream = st; 5256 st = ntohs(stseq->sequence); 5257 stseq->sequence = st; 5258 5259 /* now process */ 5260 5261 /* 5262 * Ok we now look for the stream/seq on the read 5263 * queue where its not all delivered. If we find it 5264 * we transmute the read entry into a PDI_ABORTED. 5265 */ 5266 if (stseq->stream >= asoc->streamincnt) { 5267 /* screwed up streams, stop! */ 5268 break; 5269 } 5270 if ((asoc->str_of_pdapi == stseq->stream) && 5271 (asoc->ssn_of_pdapi == stseq->sequence)) { 5272 /* 5273 * If this is the one we were partially 5274 * delivering now then we no longer are. 5275 * Note this will change with the reassembly 5276 * re-write. 5277 */ 5278 asoc->fragmented_delivery_inprogress = 0; 5279 } 5280 sctp_flush_reassm_for_str_seq(stcb, asoc, stseq->stream, stseq->sequence); 5281 TAILQ_FOREACH(ctl, &stcb->sctp_ep->read_queue, next) { 5282 if ((ctl->sinfo_stream == stseq->stream) && 5283 (ctl->sinfo_ssn == stseq->sequence)) { 5284 str_seq = (stseq->stream << 16) | stseq->sequence; 5285 ctl->end_added = 1; 5286 ctl->pdapi_aborted = 1; 5287 sv = stcb->asoc.control_pdapi; 5288 stcb->asoc.control_pdapi = ctl; 5289 sctp_ulp_notify(SCTP_NOTIFY_PARTIAL_DELVIERY_INDICATION, 5290 stcb, 5291 SCTP_PARTIAL_DELIVERY_ABORTED, 5292 (void *)&str_seq, 5293 SCTP_SO_NOT_LOCKED); 5294 stcb->asoc.control_pdapi = sv; 5295 break; 5296 } else if ((ctl->sinfo_stream == stseq->stream) && 5297 SCTP_SSN_GT(ctl->sinfo_ssn, stseq->sequence)) { 5298 /* We are past our victim SSN */ 5299 break; 5300 } 5301 } 5302 strm = &asoc->strmin[stseq->stream]; 5303 if (SCTP_SSN_GT(stseq->sequence, strm->last_sequence_delivered)) { 5304 /* Update the sequence number */ 5305 strm->last_sequence_delivered = stseq->sequence; 5306 } 5307 /* now kick the stream the new way */ 5308 /* sa_ignore NO_NULL_CHK */ 5309 sctp_kick_prsctp_reorder_queue(stcb, strm); 5310 } 5311 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 5312 } 5313 /* 5314 * Now slide thing forward. 5315 */ 5316 sctp_slide_mapping_arrays(stcb); 5317 5318 if (!TAILQ_EMPTY(&asoc->reasmqueue)) { 5319 /* now lets kick out and check for more fragmented delivery */ 5320 /* sa_ignore NO_NULL_CHK */ 5321 sctp_deliver_reasm_check(stcb, &stcb->asoc); 5322 } 5323 } 5324