1 /*- 2 * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are met: 6 * 7 * a) Redistributions of source code must retain the above copyright notice, 8 * this list of conditions and the following disclaimer. 9 * 10 * b) Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the distribution. 13 * 14 * c) Neither the name of Cisco Systems, Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived 16 * from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 20 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 28 * THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 /* $KAME: sctp_indata.c,v 1.36 2005/03/06 16:04:17 itojun Exp $ */ 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 calc = sctp_sbspace_sub(calc, (uint32_t) asoc->size_on_all_streams); 96 97 if (calc == 0) { 98 /* out of space */ 99 return (calc); 100 } 101 /* what is the overhead of all these rwnd's */ 102 calc = sctp_sbspace_sub(calc, stcb->asoc.my_rwnd_control_len); 103 /* 104 * If the window gets too small due to ctrl-stuff, reduce it to 1, 105 * even it is 0. SWS engaged 106 */ 107 if (calc < stcb->asoc.my_rwnd_control_len) { 108 calc = 1; 109 } 110 return (calc); 111 } 112 113 114 115 /* 116 * Build out our readq entry based on the incoming packet. 117 */ 118 struct sctp_queued_to_read * 119 sctp_build_readq_entry(struct sctp_tcb *stcb, 120 struct sctp_nets *net, 121 uint32_t tsn, uint32_t ppid, 122 uint32_t context, uint16_t stream_no, 123 uint16_t stream_seq, uint8_t flags, 124 struct mbuf *dm) 125 { 126 struct sctp_queued_to_read *read_queue_e = NULL; 127 128 sctp_alloc_a_readq(stcb, read_queue_e); 129 if (read_queue_e == NULL) { 130 goto failed_build; 131 } 132 read_queue_e->sinfo_stream = stream_no; 133 read_queue_e->sinfo_ssn = stream_seq; 134 read_queue_e->sinfo_flags = (flags << 8); 135 read_queue_e->sinfo_ppid = ppid; 136 read_queue_e->sinfo_context = stcb->asoc.context; 137 read_queue_e->sinfo_timetolive = 0; 138 read_queue_e->sinfo_tsn = tsn; 139 read_queue_e->sinfo_cumtsn = tsn; 140 read_queue_e->sinfo_assoc_id = sctp_get_associd(stcb); 141 read_queue_e->whoFrom = net; 142 read_queue_e->length = 0; 143 atomic_add_int(&net->ref_count, 1); 144 read_queue_e->data = dm; 145 read_queue_e->spec_flags = 0; 146 read_queue_e->tail_mbuf = NULL; 147 read_queue_e->aux_data = NULL; 148 read_queue_e->stcb = stcb; 149 read_queue_e->port_from = stcb->rport; 150 read_queue_e->do_not_ref_stcb = 0; 151 read_queue_e->end_added = 0; 152 read_queue_e->some_taken = 0; 153 read_queue_e->pdapi_aborted = 0; 154 failed_build: 155 return (read_queue_e); 156 } 157 158 159 /* 160 * Build out our readq entry based on the incoming packet. 161 */ 162 static struct sctp_queued_to_read * 163 sctp_build_readq_entry_chk(struct sctp_tcb *stcb, 164 struct sctp_tmit_chunk *chk) 165 { 166 struct sctp_queued_to_read *read_queue_e = NULL; 167 168 sctp_alloc_a_readq(stcb, read_queue_e); 169 if (read_queue_e == NULL) { 170 goto failed_build; 171 } 172 read_queue_e->sinfo_stream = chk->rec.data.stream_number; 173 read_queue_e->sinfo_ssn = chk->rec.data.stream_seq; 174 read_queue_e->sinfo_flags = (chk->rec.data.rcv_flags << 8); 175 read_queue_e->sinfo_ppid = chk->rec.data.payloadtype; 176 read_queue_e->sinfo_context = stcb->asoc.context; 177 read_queue_e->sinfo_timetolive = 0; 178 read_queue_e->sinfo_tsn = chk->rec.data.TSN_seq; 179 read_queue_e->sinfo_cumtsn = chk->rec.data.TSN_seq; 180 read_queue_e->sinfo_assoc_id = sctp_get_associd(stcb); 181 read_queue_e->whoFrom = chk->whoTo; 182 read_queue_e->aux_data = NULL; 183 read_queue_e->length = 0; 184 atomic_add_int(&chk->whoTo->ref_count, 1); 185 read_queue_e->data = chk->data; 186 read_queue_e->tail_mbuf = NULL; 187 read_queue_e->stcb = stcb; 188 read_queue_e->port_from = stcb->rport; 189 read_queue_e->spec_flags = 0; 190 read_queue_e->do_not_ref_stcb = 0; 191 read_queue_e->end_added = 0; 192 read_queue_e->some_taken = 0; 193 read_queue_e->pdapi_aborted = 0; 194 failed_build: 195 return (read_queue_e); 196 } 197 198 199 struct mbuf * 200 sctp_build_ctl_nchunk(struct sctp_inpcb *inp, 201 struct sctp_sndrcvinfo *sinfo) 202 { 203 struct sctp_sndrcvinfo *outinfo; 204 struct cmsghdr *cmh; 205 struct mbuf *ret; 206 int len; 207 int use_extended = 0; 208 209 if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_RECVDATAIOEVNT)) { 210 /* user does not want the sndrcv ctl */ 211 return (NULL); 212 } 213 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXT_RCVINFO)) { 214 use_extended = 1; 215 len = CMSG_LEN(sizeof(struct sctp_extrcvinfo)); 216 } else { 217 len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo)); 218 } 219 220 221 ret = sctp_get_mbuf_for_msg(len, 222 0, M_DONTWAIT, 1, MT_DATA); 223 224 if (ret == NULL) { 225 /* No space */ 226 return (ret); 227 } 228 /* We need a CMSG header followed by the struct */ 229 cmh = mtod(ret, struct cmsghdr *); 230 outinfo = (struct sctp_sndrcvinfo *)CMSG_DATA(cmh); 231 cmh->cmsg_level = IPPROTO_SCTP; 232 if (use_extended) { 233 cmh->cmsg_type = SCTP_EXTRCV; 234 cmh->cmsg_len = len; 235 memcpy(outinfo, sinfo, len); 236 } else { 237 cmh->cmsg_type = SCTP_SNDRCV; 238 cmh->cmsg_len = len; 239 *outinfo = *sinfo; 240 } 241 SCTP_BUF_LEN(ret) = cmh->cmsg_len; 242 return (ret); 243 } 244 245 246 char * 247 sctp_build_ctl_cchunk(struct sctp_inpcb *inp, 248 int *control_len, 249 struct sctp_sndrcvinfo *sinfo) 250 { 251 struct sctp_sndrcvinfo *outinfo; 252 struct cmsghdr *cmh; 253 char *buf; 254 int len; 255 int use_extended = 0; 256 257 if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_RECVDATAIOEVNT)) { 258 /* user does not want the sndrcv ctl */ 259 return (NULL); 260 } 261 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXT_RCVINFO)) { 262 use_extended = 1; 263 len = CMSG_LEN(sizeof(struct sctp_extrcvinfo)); 264 } else { 265 len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo)); 266 } 267 SCTP_MALLOC(buf, char *, len, SCTP_M_CMSG); 268 if (buf == NULL) { 269 /* No space */ 270 return (buf); 271 } 272 /* We need a CMSG header followed by the struct */ 273 cmh = (struct cmsghdr *)buf; 274 outinfo = (struct sctp_sndrcvinfo *)CMSG_DATA(cmh); 275 cmh->cmsg_level = IPPROTO_SCTP; 276 if (use_extended) { 277 cmh->cmsg_type = SCTP_EXTRCV; 278 cmh->cmsg_len = len; 279 memcpy(outinfo, sinfo, len); 280 } else { 281 cmh->cmsg_type = SCTP_SNDRCV; 282 cmh->cmsg_len = len; 283 *outinfo = *sinfo; 284 } 285 *control_len = len; 286 return (buf); 287 } 288 289 290 /* 291 * We are delivering currently from the reassembly queue. We must continue to 292 * deliver until we either: 1) run out of space. 2) run out of sequential 293 * TSN's 3) hit the SCTP_DATA_LAST_FRAG flag. 294 */ 295 static void 296 sctp_service_reassembly(struct sctp_tcb *stcb, struct sctp_association *asoc) 297 { 298 struct sctp_tmit_chunk *chk; 299 uint16_t nxt_todel; 300 uint16_t stream_no; 301 int end = 0; 302 int cntDel; 303 struct sctp_queued_to_read *control, *ctl, *ctlat; 304 305 if (stcb == NULL) 306 return; 307 308 cntDel = stream_no = 0; 309 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 310 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) || 311 (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET)) { 312 /* socket above is long gone or going.. */ 313 abandon: 314 asoc->fragmented_delivery_inprogress = 0; 315 chk = TAILQ_FIRST(&asoc->reasmqueue); 316 while (chk) { 317 TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next); 318 asoc->size_on_reasm_queue -= chk->send_size; 319 sctp_ucount_decr(asoc->cnt_on_reasm_queue); 320 /* 321 * Lose the data pointer, since its in the socket 322 * buffer 323 */ 324 if (chk->data) { 325 sctp_m_freem(chk->data); 326 chk->data = NULL; 327 } 328 /* Now free the address and data */ 329 sctp_free_a_chunk(stcb, chk); 330 /* sa_ignore FREED_MEMORY */ 331 chk = TAILQ_FIRST(&asoc->reasmqueue); 332 } 333 return; 334 } 335 SCTP_TCB_LOCK_ASSERT(stcb); 336 do { 337 chk = TAILQ_FIRST(&asoc->reasmqueue); 338 if (chk == NULL) { 339 return; 340 } 341 if (chk->rec.data.TSN_seq != (asoc->tsn_last_delivered + 1)) { 342 /* Can't deliver more :< */ 343 return; 344 } 345 stream_no = chk->rec.data.stream_number; 346 nxt_todel = asoc->strmin[stream_no].last_sequence_delivered + 1; 347 if (nxt_todel != chk->rec.data.stream_seq && 348 (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) { 349 /* 350 * Not the next sequence to deliver in its stream OR 351 * unordered 352 */ 353 return; 354 } 355 if (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) { 356 357 control = sctp_build_readq_entry_chk(stcb, chk); 358 if (control == NULL) { 359 /* out of memory? */ 360 return; 361 } 362 /* save it off for our future deliveries */ 363 stcb->asoc.control_pdapi = control; 364 if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) 365 end = 1; 366 else 367 end = 0; 368 sctp_add_to_readq(stcb->sctp_ep, 369 stcb, control, &stcb->sctp_socket->so_rcv, end, SCTP_SO_NOT_LOCKED); 370 cntDel++; 371 } else { 372 if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) 373 end = 1; 374 else 375 end = 0; 376 if (sctp_append_to_readq(stcb->sctp_ep, stcb, 377 stcb->asoc.control_pdapi, 378 chk->data, end, chk->rec.data.TSN_seq, 379 &stcb->sctp_socket->so_rcv)) { 380 /* 381 * something is very wrong, either 382 * control_pdapi is NULL, or the tail_mbuf 383 * is corrupt, or there is a EOM already on 384 * the mbuf chain. 385 */ 386 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) { 387 goto abandon; 388 } else { 389 #ifdef INVARIANTS 390 if ((stcb->asoc.control_pdapi == NULL) || (stcb->asoc.control_pdapi->tail_mbuf == NULL)) { 391 panic("This should not happen control_pdapi NULL?"); 392 } 393 /* if we did not panic, it was a EOM */ 394 panic("Bad chunking ??"); 395 #else 396 if ((stcb->asoc.control_pdapi == NULL) || (stcb->asoc.control_pdapi->tail_mbuf == NULL)) { 397 SCTP_PRINTF("This should not happen control_pdapi NULL?\n"); 398 } 399 SCTP_PRINTF("Bad chunking ??\n"); 400 SCTP_PRINTF("Dumping re-assembly queue this will probably hose the association\n"); 401 402 #endif 403 goto abandon; 404 } 405 } 406 cntDel++; 407 } 408 /* pull it we did it */ 409 TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next); 410 if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) { 411 asoc->fragmented_delivery_inprogress = 0; 412 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) { 413 asoc->strmin[stream_no].last_sequence_delivered++; 414 } 415 if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0) { 416 SCTP_STAT_INCR_COUNTER64(sctps_reasmusrmsgs); 417 } 418 } else if (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) { 419 /* 420 * turn the flag back on since we just delivered 421 * yet another one. 422 */ 423 asoc->fragmented_delivery_inprogress = 1; 424 } 425 asoc->tsn_of_pdapi_last_delivered = chk->rec.data.TSN_seq; 426 asoc->last_flags_delivered = chk->rec.data.rcv_flags; 427 asoc->last_strm_seq_delivered = chk->rec.data.stream_seq; 428 asoc->last_strm_no_delivered = chk->rec.data.stream_number; 429 430 asoc->tsn_last_delivered = chk->rec.data.TSN_seq; 431 asoc->size_on_reasm_queue -= chk->send_size; 432 sctp_ucount_decr(asoc->cnt_on_reasm_queue); 433 /* free up the chk */ 434 chk->data = NULL; 435 sctp_free_a_chunk(stcb, chk); 436 437 if (asoc->fragmented_delivery_inprogress == 0) { 438 /* 439 * Now lets see if we can deliver the next one on 440 * the stream 441 */ 442 struct sctp_stream_in *strm; 443 444 strm = &asoc->strmin[stream_no]; 445 nxt_todel = strm->last_sequence_delivered + 1; 446 ctl = TAILQ_FIRST(&strm->inqueue); 447 if (ctl && (nxt_todel == ctl->sinfo_ssn)) { 448 while (ctl != NULL) { 449 /* Deliver more if we can. */ 450 if (nxt_todel == ctl->sinfo_ssn) { 451 ctlat = TAILQ_NEXT(ctl, next); 452 TAILQ_REMOVE(&strm->inqueue, ctl, next); 453 asoc->size_on_all_streams -= ctl->length; 454 sctp_ucount_decr(asoc->cnt_on_all_streams); 455 strm->last_sequence_delivered++; 456 sctp_add_to_readq(stcb->sctp_ep, stcb, 457 ctl, 458 &stcb->sctp_socket->so_rcv, 1, SCTP_SO_NOT_LOCKED); 459 ctl = ctlat; 460 } else { 461 break; 462 } 463 nxt_todel = strm->last_sequence_delivered + 1; 464 } 465 } 466 break; 467 } 468 /* sa_ignore FREED_MEMORY */ 469 chk = TAILQ_FIRST(&asoc->reasmqueue); 470 } while (chk); 471 } 472 473 /* 474 * Queue the chunk either right into the socket buffer if it is the next one 475 * to go OR put it in the correct place in the delivery queue. If we do 476 * append to the so_buf, keep doing so until we are out of order. One big 477 * question still remains, what to do when the socket buffer is FULL?? 478 */ 479 static void 480 sctp_queue_data_to_stream(struct sctp_tcb *stcb, struct sctp_association *asoc, 481 struct sctp_queued_to_read *control, int *abort_flag) 482 { 483 /* 484 * FIX-ME maybe? What happens when the ssn wraps? If we are getting 485 * all the data in one stream this could happen quite rapidly. One 486 * could use the TSN to keep track of things, but this scheme breaks 487 * down in the other type of stream useage that could occur. Send a 488 * single msg to stream 0, send 4Billion messages to stream 1, now 489 * send a message to stream 0. You have a situation where the TSN 490 * has wrapped but not in the stream. Is this worth worrying about 491 * or should we just change our queue sort at the bottom to be by 492 * TSN. 493 * 494 * Could it also be legal for a peer to send ssn 1 with TSN 2 and ssn 2 495 * with TSN 1? If the peer is doing some sort of funky TSN/SSN 496 * assignment this could happen... and I don't see how this would be 497 * a violation. So for now I am undecided an will leave the sort by 498 * SSN alone. Maybe a hybred approach is the answer 499 * 500 */ 501 struct sctp_stream_in *strm; 502 struct sctp_queued_to_read *at; 503 int queue_needed; 504 uint16_t nxt_todel; 505 struct mbuf *oper; 506 507 queue_needed = 1; 508 asoc->size_on_all_streams += control->length; 509 sctp_ucount_incr(asoc->cnt_on_all_streams); 510 strm = &asoc->strmin[control->sinfo_stream]; 511 nxt_todel = strm->last_sequence_delivered + 1; 512 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { 513 sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_INTO_STRD); 514 } 515 SCTPDBG(SCTP_DEBUG_INDATA1, 516 "queue to stream called for ssn:%u lastdel:%u nxt:%u\n", 517 (uint32_t) control->sinfo_stream, 518 (uint32_t) strm->last_sequence_delivered, 519 (uint32_t) nxt_todel); 520 if (compare_with_wrap(strm->last_sequence_delivered, 521 control->sinfo_ssn, MAX_SEQ) || 522 (strm->last_sequence_delivered == control->sinfo_ssn)) { 523 /* The incoming sseq is behind where we last delivered? */ 524 SCTPDBG(SCTP_DEBUG_INDATA1, "Duplicate S-SEQ:%d delivered:%d from peer, Abort association\n", 525 control->sinfo_ssn, strm->last_sequence_delivered); 526 protocol_error: 527 /* 528 * throw it in the stream so it gets cleaned up in 529 * association destruction 530 */ 531 TAILQ_INSERT_HEAD(&strm->inqueue, control, next); 532 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 533 0, M_DONTWAIT, 1, MT_DATA); 534 if (oper) { 535 struct sctp_paramhdr *ph; 536 uint32_t *ippp; 537 538 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + 539 (sizeof(uint32_t) * 3); 540 ph = mtod(oper, struct sctp_paramhdr *); 541 ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 542 ph->param_length = htons(SCTP_BUF_LEN(oper)); 543 ippp = (uint32_t *) (ph + 1); 544 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_1); 545 ippp++; 546 *ippp = control->sinfo_tsn; 547 ippp++; 548 *ippp = ((control->sinfo_stream << 16) | control->sinfo_ssn); 549 } 550 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_1; 551 sctp_abort_an_association(stcb->sctp_ep, stcb, 552 SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); 553 554 *abort_flag = 1; 555 return; 556 557 } 558 if (nxt_todel == control->sinfo_ssn) { 559 /* can be delivered right away? */ 560 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { 561 sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_IMMED_DEL); 562 } 563 queue_needed = 0; 564 asoc->size_on_all_streams -= control->length; 565 sctp_ucount_decr(asoc->cnt_on_all_streams); 566 strm->last_sequence_delivered++; 567 sctp_add_to_readq(stcb->sctp_ep, stcb, 568 control, 569 &stcb->sctp_socket->so_rcv, 1, SCTP_SO_NOT_LOCKED); 570 control = TAILQ_FIRST(&strm->inqueue); 571 while (control != NULL) { 572 /* all delivered */ 573 nxt_todel = strm->last_sequence_delivered + 1; 574 if (nxt_todel == control->sinfo_ssn) { 575 at = TAILQ_NEXT(control, next); 576 TAILQ_REMOVE(&strm->inqueue, control, next); 577 asoc->size_on_all_streams -= control->length; 578 sctp_ucount_decr(asoc->cnt_on_all_streams); 579 strm->last_sequence_delivered++; 580 /* 581 * We ignore the return of deliver_data here 582 * since we always can hold the chunk on the 583 * d-queue. And we have a finite number that 584 * can be delivered from the strq. 585 */ 586 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { 587 sctp_log_strm_del(control, NULL, 588 SCTP_STR_LOG_FROM_IMMED_DEL); 589 } 590 sctp_add_to_readq(stcb->sctp_ep, stcb, 591 control, 592 &stcb->sctp_socket->so_rcv, 1, SCTP_SO_NOT_LOCKED); 593 control = at; 594 continue; 595 } 596 break; 597 } 598 } 599 if (queue_needed) { 600 /* 601 * Ok, we did not deliver this guy, find the correct place 602 * to put it on the queue. 603 */ 604 if ((compare_with_wrap(asoc->cumulative_tsn, 605 control->sinfo_tsn, MAX_TSN)) || 606 (control->sinfo_tsn == asoc->cumulative_tsn)) { 607 goto protocol_error; 608 } 609 if (TAILQ_EMPTY(&strm->inqueue)) { 610 /* Empty queue */ 611 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { 612 sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_INSERT_HD); 613 } 614 TAILQ_INSERT_HEAD(&strm->inqueue, control, next); 615 } else { 616 TAILQ_FOREACH(at, &strm->inqueue, next) { 617 if (compare_with_wrap(at->sinfo_ssn, 618 control->sinfo_ssn, MAX_SEQ)) { 619 /* 620 * one in queue is bigger than the 621 * new one, insert before this one 622 */ 623 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { 624 sctp_log_strm_del(control, at, 625 SCTP_STR_LOG_FROM_INSERT_MD); 626 } 627 TAILQ_INSERT_BEFORE(at, control, next); 628 break; 629 } else if (at->sinfo_ssn == control->sinfo_ssn) { 630 /* 631 * Gak, He sent me a duplicate str 632 * seq number 633 */ 634 /* 635 * foo bar, I guess I will just free 636 * this new guy, should we abort 637 * too? FIX ME MAYBE? Or it COULD be 638 * that the SSN's have wrapped. 639 * Maybe I should compare to TSN 640 * somehow... sigh for now just blow 641 * away the chunk! 642 */ 643 644 if (control->data) 645 sctp_m_freem(control->data); 646 control->data = NULL; 647 asoc->size_on_all_streams -= control->length; 648 sctp_ucount_decr(asoc->cnt_on_all_streams); 649 if (control->whoFrom) 650 sctp_free_remote_addr(control->whoFrom); 651 control->whoFrom = NULL; 652 sctp_free_a_readq(stcb, control); 653 return; 654 } else { 655 if (TAILQ_NEXT(at, next) == NULL) { 656 /* 657 * We are at the end, insert 658 * it after this one 659 */ 660 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { 661 sctp_log_strm_del(control, at, 662 SCTP_STR_LOG_FROM_INSERT_TL); 663 } 664 TAILQ_INSERT_AFTER(&strm->inqueue, 665 at, control, next); 666 break; 667 } 668 } 669 } 670 } 671 } 672 } 673 674 /* 675 * Returns two things: You get the total size of the deliverable parts of the 676 * first fragmented message on the reassembly queue. And you get a 1 back if 677 * all of the message is ready or a 0 back if the message is still incomplete 678 */ 679 static int 680 sctp_is_all_msg_on_reasm(struct sctp_association *asoc, uint32_t * t_size) 681 { 682 struct sctp_tmit_chunk *chk; 683 uint32_t tsn; 684 685 *t_size = 0; 686 chk = TAILQ_FIRST(&asoc->reasmqueue); 687 if (chk == NULL) { 688 /* nothing on the queue */ 689 return (0); 690 } 691 if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0) { 692 /* Not a first on the queue */ 693 return (0); 694 } 695 tsn = chk->rec.data.TSN_seq; 696 while (chk) { 697 if (tsn != chk->rec.data.TSN_seq) { 698 return (0); 699 } 700 *t_size += chk->send_size; 701 if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) { 702 return (1); 703 } 704 tsn++; 705 chk = TAILQ_NEXT(chk, sctp_next); 706 } 707 return (0); 708 } 709 710 static void 711 sctp_deliver_reasm_check(struct sctp_tcb *stcb, struct sctp_association *asoc) 712 { 713 struct sctp_tmit_chunk *chk; 714 uint16_t nxt_todel; 715 uint32_t tsize; 716 717 doit_again: 718 chk = TAILQ_FIRST(&asoc->reasmqueue); 719 if (chk == NULL) { 720 /* Huh? */ 721 asoc->size_on_reasm_queue = 0; 722 asoc->cnt_on_reasm_queue = 0; 723 return; 724 } 725 if (asoc->fragmented_delivery_inprogress == 0) { 726 nxt_todel = 727 asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered + 1; 728 if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) && 729 (nxt_todel == chk->rec.data.stream_seq || 730 (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED))) { 731 /* 732 * Yep the first one is here and its ok to deliver 733 * but should we? 734 */ 735 if ((sctp_is_all_msg_on_reasm(asoc, &tsize) || 736 (tsize >= stcb->sctp_ep->partial_delivery_point))) { 737 738 /* 739 * Yes, we setup to start reception, by 740 * backing down the TSN just in case we 741 * can't deliver. If we 742 */ 743 asoc->fragmented_delivery_inprogress = 1; 744 asoc->tsn_last_delivered = 745 chk->rec.data.TSN_seq - 1; 746 asoc->str_of_pdapi = 747 chk->rec.data.stream_number; 748 asoc->ssn_of_pdapi = chk->rec.data.stream_seq; 749 asoc->pdapi_ppid = chk->rec.data.payloadtype; 750 asoc->fragment_flags = chk->rec.data.rcv_flags; 751 sctp_service_reassembly(stcb, asoc); 752 } 753 } 754 } else { 755 /* 756 * Service re-assembly will deliver stream data queued at 757 * the end of fragmented delivery.. but it wont know to go 758 * back and call itself again... we do that here with the 759 * got doit_again 760 */ 761 sctp_service_reassembly(stcb, asoc); 762 if (asoc->fragmented_delivery_inprogress == 0) { 763 /* 764 * finished our Fragmented delivery, could be more 765 * waiting? 766 */ 767 goto doit_again; 768 } 769 } 770 } 771 772 /* 773 * Dump onto the re-assembly queue, in its proper place. After dumping on the 774 * queue, see if anthing can be delivered. If so pull it off (or as much as 775 * we can. If we run out of space then we must dump what we can and set the 776 * appropriate flag to say we queued what we could. 777 */ 778 static void 779 sctp_queue_data_for_reasm(struct sctp_tcb *stcb, struct sctp_association *asoc, 780 struct sctp_tmit_chunk *chk, int *abort_flag) 781 { 782 struct mbuf *oper; 783 uint32_t cum_ackp1, last_tsn, prev_tsn, post_tsn; 784 u_char last_flags; 785 struct sctp_tmit_chunk *at, *prev, *next; 786 787 prev = next = NULL; 788 cum_ackp1 = asoc->tsn_last_delivered + 1; 789 if (TAILQ_EMPTY(&asoc->reasmqueue)) { 790 /* This is the first one on the queue */ 791 TAILQ_INSERT_HEAD(&asoc->reasmqueue, chk, sctp_next); 792 /* 793 * we do not check for delivery of anything when only one 794 * fragment is here 795 */ 796 asoc->size_on_reasm_queue = chk->send_size; 797 sctp_ucount_incr(asoc->cnt_on_reasm_queue); 798 if (chk->rec.data.TSN_seq == cum_ackp1) { 799 if (asoc->fragmented_delivery_inprogress == 0 && 800 (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) != 801 SCTP_DATA_FIRST_FRAG) { 802 /* 803 * An empty queue, no delivery inprogress, 804 * we hit the next one and it does NOT have 805 * a FIRST fragment mark. 806 */ 807 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, its not first, no fragmented delivery in progress\n"); 808 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 809 0, M_DONTWAIT, 1, MT_DATA); 810 811 if (oper) { 812 struct sctp_paramhdr *ph; 813 uint32_t *ippp; 814 815 SCTP_BUF_LEN(oper) = 816 sizeof(struct sctp_paramhdr) + 817 (sizeof(uint32_t) * 3); 818 ph = mtod(oper, struct sctp_paramhdr *); 819 ph->param_type = 820 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 821 ph->param_length = htons(SCTP_BUF_LEN(oper)); 822 ippp = (uint32_t *) (ph + 1); 823 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_2); 824 ippp++; 825 *ippp = chk->rec.data.TSN_seq; 826 ippp++; 827 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); 828 829 } 830 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_2; 831 sctp_abort_an_association(stcb->sctp_ep, stcb, 832 SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); 833 *abort_flag = 1; 834 } else if (asoc->fragmented_delivery_inprogress && 835 (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == SCTP_DATA_FIRST_FRAG) { 836 /* 837 * We are doing a partial delivery and the 838 * NEXT chunk MUST be either the LAST or 839 * MIDDLE fragment NOT a FIRST 840 */ 841 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it IS a first and fragmented delivery in progress\n"); 842 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 843 0, M_DONTWAIT, 1, MT_DATA); 844 if (oper) { 845 struct sctp_paramhdr *ph; 846 uint32_t *ippp; 847 848 SCTP_BUF_LEN(oper) = 849 sizeof(struct sctp_paramhdr) + 850 (3 * sizeof(uint32_t)); 851 ph = mtod(oper, struct sctp_paramhdr *); 852 ph->param_type = 853 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 854 ph->param_length = htons(SCTP_BUF_LEN(oper)); 855 ippp = (uint32_t *) (ph + 1); 856 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_3); 857 ippp++; 858 *ippp = chk->rec.data.TSN_seq; 859 ippp++; 860 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); 861 } 862 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_3; 863 sctp_abort_an_association(stcb->sctp_ep, stcb, 864 SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); 865 *abort_flag = 1; 866 } else if (asoc->fragmented_delivery_inprogress) { 867 /* 868 * Here we are ok with a MIDDLE or LAST 869 * piece 870 */ 871 if (chk->rec.data.stream_number != 872 asoc->str_of_pdapi) { 873 /* Got to be the right STR No */ 874 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it IS not same stream number %d vs %d\n", 875 chk->rec.data.stream_number, 876 asoc->str_of_pdapi); 877 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 878 0, M_DONTWAIT, 1, MT_DATA); 879 if (oper) { 880 struct sctp_paramhdr *ph; 881 uint32_t *ippp; 882 883 SCTP_BUF_LEN(oper) = 884 sizeof(struct sctp_paramhdr) + 885 (sizeof(uint32_t) * 3); 886 ph = mtod(oper, 887 struct sctp_paramhdr *); 888 ph->param_type = 889 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 890 ph->param_length = 891 htons(SCTP_BUF_LEN(oper)); 892 ippp = (uint32_t *) (ph + 1); 893 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_4); 894 ippp++; 895 *ippp = chk->rec.data.TSN_seq; 896 ippp++; 897 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); 898 } 899 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_4; 900 sctp_abort_an_association(stcb->sctp_ep, 901 stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); 902 *abort_flag = 1; 903 } else if ((asoc->fragment_flags & SCTP_DATA_UNORDERED) != 904 SCTP_DATA_UNORDERED && 905 chk->rec.data.stream_seq != 906 asoc->ssn_of_pdapi) { 907 /* Got to be the right STR Seq */ 908 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it IS not same stream seq %d vs %d\n", 909 chk->rec.data.stream_seq, 910 asoc->ssn_of_pdapi); 911 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 912 0, M_DONTWAIT, 1, MT_DATA); 913 if (oper) { 914 struct sctp_paramhdr *ph; 915 uint32_t *ippp; 916 917 SCTP_BUF_LEN(oper) = 918 sizeof(struct sctp_paramhdr) + 919 (3 * sizeof(uint32_t)); 920 ph = mtod(oper, 921 struct sctp_paramhdr *); 922 ph->param_type = 923 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 924 ph->param_length = 925 htons(SCTP_BUF_LEN(oper)); 926 ippp = (uint32_t *) (ph + 1); 927 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_5); 928 ippp++; 929 *ippp = chk->rec.data.TSN_seq; 930 ippp++; 931 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); 932 933 } 934 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_5; 935 sctp_abort_an_association(stcb->sctp_ep, 936 stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); 937 *abort_flag = 1; 938 } 939 } 940 } 941 return; 942 } 943 /* Find its place */ 944 TAILQ_FOREACH(at, &asoc->reasmqueue, sctp_next) { 945 if (compare_with_wrap(at->rec.data.TSN_seq, 946 chk->rec.data.TSN_seq, MAX_TSN)) { 947 /* 948 * one in queue is bigger than the new one, insert 949 * before this one 950 */ 951 /* A check */ 952 asoc->size_on_reasm_queue += chk->send_size; 953 sctp_ucount_incr(asoc->cnt_on_reasm_queue); 954 next = at; 955 TAILQ_INSERT_BEFORE(at, chk, sctp_next); 956 break; 957 } else if (at->rec.data.TSN_seq == chk->rec.data.TSN_seq) { 958 /* Gak, He sent me a duplicate str seq number */ 959 /* 960 * foo bar, I guess I will just free this new guy, 961 * should we abort too? FIX ME MAYBE? Or it COULD be 962 * that the SSN's have wrapped. Maybe I should 963 * compare to TSN somehow... sigh for now just blow 964 * away the chunk! 965 */ 966 if (chk->data) { 967 sctp_m_freem(chk->data); 968 chk->data = NULL; 969 } 970 sctp_free_a_chunk(stcb, chk); 971 return; 972 } else { 973 last_flags = at->rec.data.rcv_flags; 974 last_tsn = at->rec.data.TSN_seq; 975 prev = at; 976 if (TAILQ_NEXT(at, sctp_next) == NULL) { 977 /* 978 * We are at the end, insert it after this 979 * one 980 */ 981 /* check it first */ 982 asoc->size_on_reasm_queue += chk->send_size; 983 sctp_ucount_incr(asoc->cnt_on_reasm_queue); 984 TAILQ_INSERT_AFTER(&asoc->reasmqueue, at, chk, sctp_next); 985 break; 986 } 987 } 988 } 989 /* Now the audits */ 990 if (prev) { 991 prev_tsn = chk->rec.data.TSN_seq - 1; 992 if (prev_tsn == prev->rec.data.TSN_seq) { 993 /* 994 * Ok the one I am dropping onto the end is the 995 * NEXT. A bit of valdiation here. 996 */ 997 if ((prev->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) == 998 SCTP_DATA_FIRST_FRAG || 999 (prev->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) == 1000 SCTP_DATA_MIDDLE_FRAG) { 1001 /* 1002 * Insert chk MUST be a MIDDLE or LAST 1003 * fragment 1004 */ 1005 if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) == 1006 SCTP_DATA_FIRST_FRAG) { 1007 SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - It can be a midlle or last but not a first\n"); 1008 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it's a FIRST!\n"); 1009 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 1010 0, M_DONTWAIT, 1, MT_DATA); 1011 if (oper) { 1012 struct sctp_paramhdr *ph; 1013 uint32_t *ippp; 1014 1015 SCTP_BUF_LEN(oper) = 1016 sizeof(struct sctp_paramhdr) + 1017 (3 * sizeof(uint32_t)); 1018 ph = mtod(oper, 1019 struct sctp_paramhdr *); 1020 ph->param_type = 1021 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 1022 ph->param_length = 1023 htons(SCTP_BUF_LEN(oper)); 1024 ippp = (uint32_t *) (ph + 1); 1025 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_6); 1026 ippp++; 1027 *ippp = chk->rec.data.TSN_seq; 1028 ippp++; 1029 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); 1030 1031 } 1032 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_6; 1033 sctp_abort_an_association(stcb->sctp_ep, 1034 stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); 1035 *abort_flag = 1; 1036 return; 1037 } 1038 if (chk->rec.data.stream_number != 1039 prev->rec.data.stream_number) { 1040 /* 1041 * Huh, need the correct STR here, 1042 * they must be the same. 1043 */ 1044 SCTP_PRINTF("Prev check - Gak, Evil plot, ssn:%d not the same as at:%d\n", 1045 chk->rec.data.stream_number, 1046 prev->rec.data.stream_number); 1047 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 1048 0, M_DONTWAIT, 1, MT_DATA); 1049 if (oper) { 1050 struct sctp_paramhdr *ph; 1051 uint32_t *ippp; 1052 1053 SCTP_BUF_LEN(oper) = 1054 sizeof(struct sctp_paramhdr) + 1055 (3 * sizeof(uint32_t)); 1056 ph = mtod(oper, 1057 struct sctp_paramhdr *); 1058 ph->param_type = 1059 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 1060 ph->param_length = 1061 htons(SCTP_BUF_LEN(oper)); 1062 ippp = (uint32_t *) (ph + 1); 1063 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_7); 1064 ippp++; 1065 *ippp = chk->rec.data.TSN_seq; 1066 ippp++; 1067 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); 1068 } 1069 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_7; 1070 sctp_abort_an_association(stcb->sctp_ep, 1071 stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); 1072 1073 *abort_flag = 1; 1074 return; 1075 } 1076 if ((prev->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0 && 1077 chk->rec.data.stream_seq != 1078 prev->rec.data.stream_seq) { 1079 /* 1080 * Huh, need the correct STR here, 1081 * they must be the same. 1082 */ 1083 SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - Gak, Evil plot, sseq:%d not the same as at:%d\n", 1084 chk->rec.data.stream_seq, 1085 prev->rec.data.stream_seq); 1086 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 1087 0, M_DONTWAIT, 1, MT_DATA); 1088 if (oper) { 1089 struct sctp_paramhdr *ph; 1090 uint32_t *ippp; 1091 1092 SCTP_BUF_LEN(oper) = 1093 sizeof(struct sctp_paramhdr) + 1094 (3 * sizeof(uint32_t)); 1095 ph = mtod(oper, 1096 struct sctp_paramhdr *); 1097 ph->param_type = 1098 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 1099 ph->param_length = 1100 htons(SCTP_BUF_LEN(oper)); 1101 ippp = (uint32_t *) (ph + 1); 1102 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_8); 1103 ippp++; 1104 *ippp = chk->rec.data.TSN_seq; 1105 ippp++; 1106 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); 1107 } 1108 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_8; 1109 sctp_abort_an_association(stcb->sctp_ep, 1110 stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); 1111 1112 *abort_flag = 1; 1113 return; 1114 } 1115 } else if ((prev->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) == 1116 SCTP_DATA_LAST_FRAG) { 1117 /* Insert chk MUST be a FIRST */ 1118 if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) != 1119 SCTP_DATA_FIRST_FRAG) { 1120 SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - Gak, evil plot, its not FIRST and it must be!\n"); 1121 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 1122 0, M_DONTWAIT, 1, MT_DATA); 1123 if (oper) { 1124 struct sctp_paramhdr *ph; 1125 uint32_t *ippp; 1126 1127 SCTP_BUF_LEN(oper) = 1128 sizeof(struct sctp_paramhdr) + 1129 (3 * sizeof(uint32_t)); 1130 ph = mtod(oper, 1131 struct sctp_paramhdr *); 1132 ph->param_type = 1133 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 1134 ph->param_length = 1135 htons(SCTP_BUF_LEN(oper)); 1136 ippp = (uint32_t *) (ph + 1); 1137 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_9); 1138 ippp++; 1139 *ippp = chk->rec.data.TSN_seq; 1140 ippp++; 1141 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); 1142 1143 } 1144 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_9; 1145 sctp_abort_an_association(stcb->sctp_ep, 1146 stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); 1147 1148 *abort_flag = 1; 1149 return; 1150 } 1151 } 1152 } 1153 } 1154 if (next) { 1155 post_tsn = chk->rec.data.TSN_seq + 1; 1156 if (post_tsn == next->rec.data.TSN_seq) { 1157 /* 1158 * Ok the one I am inserting ahead of is my NEXT 1159 * one. A bit of valdiation here. 1160 */ 1161 if (next->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) { 1162 /* Insert chk MUST be a last fragment */ 1163 if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) 1164 != SCTP_DATA_LAST_FRAG) { 1165 SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Next is FIRST, we must be LAST\n"); 1166 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, its not a last!\n"); 1167 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 1168 0, M_DONTWAIT, 1, MT_DATA); 1169 if (oper) { 1170 struct sctp_paramhdr *ph; 1171 uint32_t *ippp; 1172 1173 SCTP_BUF_LEN(oper) = 1174 sizeof(struct sctp_paramhdr) + 1175 (3 * sizeof(uint32_t)); 1176 ph = mtod(oper, 1177 struct sctp_paramhdr *); 1178 ph->param_type = 1179 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 1180 ph->param_length = 1181 htons(SCTP_BUF_LEN(oper)); 1182 ippp = (uint32_t *) (ph + 1); 1183 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_10); 1184 ippp++; 1185 *ippp = chk->rec.data.TSN_seq; 1186 ippp++; 1187 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); 1188 } 1189 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_10; 1190 sctp_abort_an_association(stcb->sctp_ep, 1191 stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); 1192 1193 *abort_flag = 1; 1194 return; 1195 } 1196 } else if ((next->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) == 1197 SCTP_DATA_MIDDLE_FRAG || 1198 (next->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) == 1199 SCTP_DATA_LAST_FRAG) { 1200 /* 1201 * Insert chk CAN be MIDDLE or FIRST NOT 1202 * LAST 1203 */ 1204 if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) == 1205 SCTP_DATA_LAST_FRAG) { 1206 SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Next is a MIDDLE/LAST\n"); 1207 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, new prev chunk is a LAST\n"); 1208 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 1209 0, M_DONTWAIT, 1, MT_DATA); 1210 if (oper) { 1211 struct sctp_paramhdr *ph; 1212 uint32_t *ippp; 1213 1214 SCTP_BUF_LEN(oper) = 1215 sizeof(struct sctp_paramhdr) + 1216 (3 * sizeof(uint32_t)); 1217 ph = mtod(oper, 1218 struct sctp_paramhdr *); 1219 ph->param_type = 1220 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 1221 ph->param_length = 1222 htons(SCTP_BUF_LEN(oper)); 1223 ippp = (uint32_t *) (ph + 1); 1224 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_11); 1225 ippp++; 1226 *ippp = chk->rec.data.TSN_seq; 1227 ippp++; 1228 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); 1229 1230 } 1231 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_11; 1232 sctp_abort_an_association(stcb->sctp_ep, 1233 stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); 1234 1235 *abort_flag = 1; 1236 return; 1237 } 1238 if (chk->rec.data.stream_number != 1239 next->rec.data.stream_number) { 1240 /* 1241 * Huh, need the correct STR here, 1242 * they must be the same. 1243 */ 1244 SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Gak, Evil plot, ssn:%d not the same as at:%d\n", 1245 chk->rec.data.stream_number, 1246 next->rec.data.stream_number); 1247 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 1248 0, M_DONTWAIT, 1, MT_DATA); 1249 if (oper) { 1250 struct sctp_paramhdr *ph; 1251 uint32_t *ippp; 1252 1253 SCTP_BUF_LEN(oper) = 1254 sizeof(struct sctp_paramhdr) + 1255 (3 * sizeof(uint32_t)); 1256 ph = mtod(oper, 1257 struct sctp_paramhdr *); 1258 ph->param_type = 1259 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 1260 ph->param_length = 1261 htons(SCTP_BUF_LEN(oper)); 1262 ippp = (uint32_t *) (ph + 1); 1263 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_12); 1264 ippp++; 1265 *ippp = chk->rec.data.TSN_seq; 1266 ippp++; 1267 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); 1268 1269 } 1270 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_12; 1271 sctp_abort_an_association(stcb->sctp_ep, 1272 stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); 1273 1274 *abort_flag = 1; 1275 return; 1276 } 1277 if ((next->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0 && 1278 chk->rec.data.stream_seq != 1279 next->rec.data.stream_seq) { 1280 /* 1281 * Huh, need the correct STR here, 1282 * they must be the same. 1283 */ 1284 SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Gak, Evil plot, sseq:%d not the same as at:%d\n", 1285 chk->rec.data.stream_seq, 1286 next->rec.data.stream_seq); 1287 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 1288 0, M_DONTWAIT, 1, MT_DATA); 1289 if (oper) { 1290 struct sctp_paramhdr *ph; 1291 uint32_t *ippp; 1292 1293 SCTP_BUF_LEN(oper) = 1294 sizeof(struct sctp_paramhdr) + 1295 (3 * sizeof(uint32_t)); 1296 ph = mtod(oper, 1297 struct sctp_paramhdr *); 1298 ph->param_type = 1299 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 1300 ph->param_length = 1301 htons(SCTP_BUF_LEN(oper)); 1302 ippp = (uint32_t *) (ph + 1); 1303 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_13); 1304 ippp++; 1305 *ippp = chk->rec.data.TSN_seq; 1306 ippp++; 1307 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); 1308 } 1309 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_13; 1310 sctp_abort_an_association(stcb->sctp_ep, 1311 stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); 1312 1313 *abort_flag = 1; 1314 return; 1315 } 1316 } 1317 } 1318 } 1319 /* Do we need to do some delivery? check */ 1320 sctp_deliver_reasm_check(stcb, asoc); 1321 } 1322 1323 /* 1324 * This is an unfortunate routine. It checks to make sure a evil guy is not 1325 * stuffing us full of bad packet fragments. A broken peer could also do this 1326 * but this is doubtful. It is to bad I must worry about evil crackers sigh 1327 * :< more cycles. 1328 */ 1329 static int 1330 sctp_does_tsn_belong_to_reasm(struct sctp_association *asoc, 1331 uint32_t TSN_seq) 1332 { 1333 struct sctp_tmit_chunk *at; 1334 uint32_t tsn_est; 1335 1336 TAILQ_FOREACH(at, &asoc->reasmqueue, sctp_next) { 1337 if (compare_with_wrap(TSN_seq, 1338 at->rec.data.TSN_seq, MAX_TSN)) { 1339 /* is it one bigger? */ 1340 tsn_est = at->rec.data.TSN_seq + 1; 1341 if (tsn_est == TSN_seq) { 1342 /* yep. It better be a last then */ 1343 if ((at->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) != 1344 SCTP_DATA_LAST_FRAG) { 1345 /* 1346 * Ok this guy belongs next to a guy 1347 * that is NOT last, it should be a 1348 * middle/last, not a complete 1349 * chunk. 1350 */ 1351 return (1); 1352 } else { 1353 /* 1354 * This guy is ok since its a LAST 1355 * and the new chunk is a fully 1356 * self- contained one. 1357 */ 1358 return (0); 1359 } 1360 } 1361 } else if (TSN_seq == at->rec.data.TSN_seq) { 1362 /* Software error since I have a dup? */ 1363 return (1); 1364 } else { 1365 /* 1366 * Ok, 'at' is larger than new chunk but does it 1367 * need to be right before it. 1368 */ 1369 tsn_est = TSN_seq + 1; 1370 if (tsn_est == at->rec.data.TSN_seq) { 1371 /* Yep, It better be a first */ 1372 if ((at->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) != 1373 SCTP_DATA_FIRST_FRAG) { 1374 return (1); 1375 } else { 1376 return (0); 1377 } 1378 } 1379 } 1380 } 1381 return (0); 1382 } 1383 1384 1385 static int 1386 sctp_process_a_data_chunk(struct sctp_tcb *stcb, struct sctp_association *asoc, 1387 struct mbuf **m, int offset, struct sctp_data_chunk *ch, int chk_length, 1388 struct sctp_nets *net, uint32_t * high_tsn, int *abort_flag, 1389 int *break_flag, int last_chunk) 1390 { 1391 /* Process a data chunk */ 1392 /* struct sctp_tmit_chunk *chk; */ 1393 struct sctp_tmit_chunk *chk; 1394 uint32_t tsn, gap; 1395 struct mbuf *dmbuf; 1396 int indx, the_len; 1397 int need_reasm_check = 0; 1398 uint16_t strmno, strmseq; 1399 struct mbuf *oper; 1400 struct sctp_queued_to_read *control; 1401 int ordered; 1402 uint32_t protocol_id; 1403 uint8_t chunk_flags; 1404 struct sctp_stream_reset_list *liste; 1405 1406 chk = NULL; 1407 tsn = ntohl(ch->dp.tsn); 1408 chunk_flags = ch->ch.chunk_flags; 1409 if ((chunk_flags & SCTP_DATA_SACK_IMMEDIATELY) == SCTP_DATA_SACK_IMMEDIATELY) { 1410 asoc->send_sack = 1; 1411 } 1412 protocol_id = ch->dp.protocol_id; 1413 ordered = ((ch->ch.chunk_flags & SCTP_DATA_UNORDERED) == 0); 1414 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 1415 sctp_log_map(tsn, asoc->cumulative_tsn, asoc->highest_tsn_inside_map, SCTP_MAP_TSN_ENTERS); 1416 } 1417 if (stcb == NULL) { 1418 return (0); 1419 } 1420 SCTP_LTRACE_CHK(stcb->sctp_ep, stcb, ch->ch.chunk_type, tsn); 1421 if (compare_with_wrap(asoc->cumulative_tsn, tsn, MAX_TSN) || 1422 asoc->cumulative_tsn == tsn) { 1423 /* It is a duplicate */ 1424 SCTP_STAT_INCR(sctps_recvdupdata); 1425 if (asoc->numduptsns < SCTP_MAX_DUP_TSNS) { 1426 /* Record a dup for the next outbound sack */ 1427 asoc->dup_tsns[asoc->numduptsns] = tsn; 1428 asoc->numduptsns++; 1429 } 1430 asoc->send_sack = 1; 1431 return (0); 1432 } 1433 /* Calculate the number of TSN's between the base and this TSN */ 1434 if (tsn >= asoc->mapping_array_base_tsn) { 1435 gap = tsn - asoc->mapping_array_base_tsn; 1436 } else { 1437 gap = (MAX_TSN - asoc->mapping_array_base_tsn) + tsn + 1; 1438 } 1439 if (gap >= (SCTP_MAPPING_ARRAY << 3)) { 1440 /* Can't hold the bit in the mapping at max array, toss it */ 1441 return (0); 1442 } 1443 if (gap >= (uint32_t) (asoc->mapping_array_size << 3)) { 1444 SCTP_TCB_LOCK_ASSERT(stcb); 1445 if (sctp_expand_mapping_array(asoc, gap)) { 1446 /* Can't expand, drop it */ 1447 return (0); 1448 } 1449 } 1450 if (compare_with_wrap(tsn, *high_tsn, MAX_TSN)) { 1451 *high_tsn = tsn; 1452 } 1453 /* See if we have received this one already */ 1454 if (SCTP_IS_TSN_PRESENT(asoc->mapping_array, gap)) { 1455 SCTP_STAT_INCR(sctps_recvdupdata); 1456 if (asoc->numduptsns < SCTP_MAX_DUP_TSNS) { 1457 /* Record a dup for the next outbound sack */ 1458 asoc->dup_tsns[asoc->numduptsns] = tsn; 1459 asoc->numduptsns++; 1460 } 1461 asoc->send_sack = 1; 1462 return (0); 1463 } 1464 /* 1465 * Check to see about the GONE flag, duplicates would cause a sack 1466 * to be sent up above 1467 */ 1468 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 1469 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || 1470 (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET)) 1471 ) { 1472 /* 1473 * wait a minute, this guy is gone, there is no longer a 1474 * receiver. Send peer an ABORT! 1475 */ 1476 struct mbuf *op_err; 1477 1478 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 1479 sctp_abort_an_association(stcb->sctp_ep, stcb, 0, op_err, SCTP_SO_NOT_LOCKED); 1480 *abort_flag = 1; 1481 return (0); 1482 } 1483 /* 1484 * Now before going further we see if there is room. If NOT then we 1485 * MAY let one through only IF this TSN is the one we are waiting 1486 * for on a partial delivery API. 1487 */ 1488 1489 /* now do the tests */ 1490 if (((asoc->cnt_on_all_streams + 1491 asoc->cnt_on_reasm_queue + 1492 asoc->cnt_msg_on_sb) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue)) || 1493 (((int)asoc->my_rwnd) <= 0)) { 1494 /* 1495 * When we have NO room in the rwnd we check to make sure 1496 * the reader is doing its job... 1497 */ 1498 if (stcb->sctp_socket->so_rcv.sb_cc) { 1499 /* some to read, wake-up */ 1500 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1501 struct socket *so; 1502 1503 so = SCTP_INP_SO(stcb->sctp_ep); 1504 atomic_add_int(&stcb->asoc.refcnt, 1); 1505 SCTP_TCB_UNLOCK(stcb); 1506 SCTP_SOCKET_LOCK(so, 1); 1507 SCTP_TCB_LOCK(stcb); 1508 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1509 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1510 /* assoc was freed while we were unlocked */ 1511 SCTP_SOCKET_UNLOCK(so, 1); 1512 return (0); 1513 } 1514 #endif 1515 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 1516 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1517 SCTP_SOCKET_UNLOCK(so, 1); 1518 #endif 1519 } 1520 /* now is it in the mapping array of what we have accepted? */ 1521 if (compare_with_wrap(tsn, asoc->highest_tsn_inside_map, MAX_TSN)) { 1522 /* Nope not in the valid range dump it */ 1523 sctp_set_rwnd(stcb, asoc); 1524 if ((asoc->cnt_on_all_streams + 1525 asoc->cnt_on_reasm_queue + 1526 asoc->cnt_msg_on_sb) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue)) { 1527 SCTP_STAT_INCR(sctps_datadropchklmt); 1528 } else { 1529 SCTP_STAT_INCR(sctps_datadroprwnd); 1530 } 1531 indx = *break_flag; 1532 *break_flag = 1; 1533 return (0); 1534 } 1535 } 1536 strmno = ntohs(ch->dp.stream_id); 1537 if (strmno >= asoc->streamincnt) { 1538 struct sctp_paramhdr *phdr; 1539 struct mbuf *mb; 1540 1541 mb = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) * 2), 1542 0, M_DONTWAIT, 1, MT_DATA); 1543 if (mb != NULL) { 1544 /* add some space up front so prepend will work well */ 1545 SCTP_BUF_RESV_UF(mb, sizeof(struct sctp_chunkhdr)); 1546 phdr = mtod(mb, struct sctp_paramhdr *); 1547 /* 1548 * Error causes are just param's and this one has 1549 * two back to back phdr, one with the error type 1550 * and size, the other with the streamid and a rsvd 1551 */ 1552 SCTP_BUF_LEN(mb) = (sizeof(struct sctp_paramhdr) * 2); 1553 phdr->param_type = htons(SCTP_CAUSE_INVALID_STREAM); 1554 phdr->param_length = 1555 htons(sizeof(struct sctp_paramhdr) * 2); 1556 phdr++; 1557 /* We insert the stream in the type field */ 1558 phdr->param_type = ch->dp.stream_id; 1559 /* And set the length to 0 for the rsvd field */ 1560 phdr->param_length = 0; 1561 sctp_queue_op_err(stcb, mb); 1562 } 1563 SCTP_STAT_INCR(sctps_badsid); 1564 SCTP_TCB_LOCK_ASSERT(stcb); 1565 SCTP_SET_TSN_PRESENT(asoc->mapping_array, gap); 1566 if (compare_with_wrap(tsn, asoc->highest_tsn_inside_map, MAX_TSN)) { 1567 /* we have a new high score */ 1568 asoc->highest_tsn_inside_map = tsn; 1569 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 1570 sctp_log_map(0, 2, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 1571 } 1572 } 1573 if (tsn == (asoc->cumulative_tsn + 1)) { 1574 /* Update cum-ack */ 1575 asoc->cumulative_tsn = tsn; 1576 } 1577 return (0); 1578 } 1579 /* 1580 * Before we continue lets validate that we are not being fooled by 1581 * an evil attacker. We can only have 4k chunks based on our TSN 1582 * spread allowed by the mapping array 512 * 8 bits, so there is no 1583 * way our stream sequence numbers could have wrapped. We of course 1584 * only validate the FIRST fragment so the bit must be set. 1585 */ 1586 strmseq = ntohs(ch->dp.stream_sequence); 1587 #ifdef SCTP_ASOCLOG_OF_TSNS 1588 SCTP_TCB_LOCK_ASSERT(stcb); 1589 if (asoc->tsn_in_at >= SCTP_TSN_LOG_SIZE) { 1590 asoc->tsn_in_at = 0; 1591 asoc->tsn_in_wrapped = 1; 1592 } 1593 asoc->in_tsnlog[asoc->tsn_in_at].tsn = tsn; 1594 asoc->in_tsnlog[asoc->tsn_in_at].strm = strmno; 1595 asoc->in_tsnlog[asoc->tsn_in_at].seq = strmseq; 1596 asoc->in_tsnlog[asoc->tsn_in_at].sz = chk_length; 1597 asoc->in_tsnlog[asoc->tsn_in_at].flgs = chunk_flags; 1598 asoc->in_tsnlog[asoc->tsn_in_at].stcb = (void *)stcb; 1599 asoc->in_tsnlog[asoc->tsn_in_at].in_pos = asoc->tsn_in_at; 1600 asoc->in_tsnlog[asoc->tsn_in_at].in_out = 1; 1601 asoc->tsn_in_at++; 1602 #endif 1603 if ((chunk_flags & SCTP_DATA_FIRST_FRAG) && 1604 (TAILQ_EMPTY(&asoc->resetHead)) && 1605 (chunk_flags & SCTP_DATA_UNORDERED) == 0 && 1606 (compare_with_wrap(asoc->strmin[strmno].last_sequence_delivered, 1607 strmseq, MAX_SEQ) || 1608 asoc->strmin[strmno].last_sequence_delivered == strmseq)) { 1609 /* The incoming sseq is behind where we last delivered? */ 1610 SCTPDBG(SCTP_DEBUG_INDATA1, "EVIL/Broken-Dup S-SEQ:%d delivered:%d from peer, Abort!\n", 1611 strmseq, asoc->strmin[strmno].last_sequence_delivered); 1612 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 1613 0, M_DONTWAIT, 1, MT_DATA); 1614 if (oper) { 1615 struct sctp_paramhdr *ph; 1616 uint32_t *ippp; 1617 1618 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + 1619 (3 * sizeof(uint32_t)); 1620 ph = mtod(oper, struct sctp_paramhdr *); 1621 ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 1622 ph->param_length = htons(SCTP_BUF_LEN(oper)); 1623 ippp = (uint32_t *) (ph + 1); 1624 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_14); 1625 ippp++; 1626 *ippp = tsn; 1627 ippp++; 1628 *ippp = ((strmno << 16) | strmseq); 1629 1630 } 1631 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_14; 1632 sctp_abort_an_association(stcb->sctp_ep, stcb, 1633 SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); 1634 *abort_flag = 1; 1635 return (0); 1636 } 1637 /************************************ 1638 * From here down we may find ch-> invalid 1639 * so its a good idea NOT to use it. 1640 *************************************/ 1641 1642 the_len = (chk_length - sizeof(struct sctp_data_chunk)); 1643 if (last_chunk == 0) { 1644 dmbuf = SCTP_M_COPYM(*m, 1645 (offset + sizeof(struct sctp_data_chunk)), 1646 the_len, M_DONTWAIT); 1647 #ifdef SCTP_MBUF_LOGGING 1648 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 1649 struct mbuf *mat; 1650 1651 mat = dmbuf; 1652 while (mat) { 1653 if (SCTP_BUF_IS_EXTENDED(mat)) { 1654 sctp_log_mb(mat, SCTP_MBUF_ICOPY); 1655 } 1656 mat = SCTP_BUF_NEXT(mat); 1657 } 1658 } 1659 #endif 1660 } else { 1661 /* We can steal the last chunk */ 1662 int l_len; 1663 1664 dmbuf = *m; 1665 /* lop off the top part */ 1666 m_adj(dmbuf, (offset + sizeof(struct sctp_data_chunk))); 1667 if (SCTP_BUF_NEXT(dmbuf) == NULL) { 1668 l_len = SCTP_BUF_LEN(dmbuf); 1669 } else { 1670 /* 1671 * need to count up the size hopefully does not hit 1672 * this to often :-0 1673 */ 1674 struct mbuf *lat; 1675 1676 l_len = 0; 1677 lat = dmbuf; 1678 while (lat) { 1679 l_len += SCTP_BUF_LEN(lat); 1680 lat = SCTP_BUF_NEXT(lat); 1681 } 1682 } 1683 if (l_len > the_len) { 1684 /* Trim the end round bytes off too */ 1685 m_adj(dmbuf, -(l_len - the_len)); 1686 } 1687 } 1688 if (dmbuf == NULL) { 1689 SCTP_STAT_INCR(sctps_nomem); 1690 return (0); 1691 } 1692 if ((chunk_flags & SCTP_DATA_NOT_FRAG) == SCTP_DATA_NOT_FRAG && 1693 asoc->fragmented_delivery_inprogress == 0 && 1694 TAILQ_EMPTY(&asoc->resetHead) && 1695 ((ordered == 0) || 1696 ((asoc->strmin[strmno].last_sequence_delivered + 1) == strmseq && 1697 TAILQ_EMPTY(&asoc->strmin[strmno].inqueue)))) { 1698 /* Candidate for express delivery */ 1699 /* 1700 * Its not fragmented, No PD-API is up, Nothing in the 1701 * delivery queue, Its un-ordered OR ordered and the next to 1702 * deliver AND nothing else is stuck on the stream queue, 1703 * And there is room for it in the socket buffer. Lets just 1704 * stuff it up the buffer.... 1705 */ 1706 1707 /* It would be nice to avoid this copy if we could :< */ 1708 sctp_alloc_a_readq(stcb, control); 1709 sctp_build_readq_entry_mac(control, stcb, asoc->context, net, tsn, 1710 protocol_id, 1711 stcb->asoc.context, 1712 strmno, strmseq, 1713 chunk_flags, 1714 dmbuf); 1715 if (control == NULL) { 1716 goto failed_express_del; 1717 } 1718 sctp_add_to_readq(stcb->sctp_ep, stcb, control, &stcb->sctp_socket->so_rcv, 1, SCTP_SO_NOT_LOCKED); 1719 if ((chunk_flags & SCTP_DATA_UNORDERED) == 0) { 1720 /* for ordered, bump what we delivered */ 1721 asoc->strmin[strmno].last_sequence_delivered++; 1722 } 1723 SCTP_STAT_INCR(sctps_recvexpress); 1724 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { 1725 sctp_log_strm_del_alt(stcb, tsn, strmseq, strmno, 1726 SCTP_STR_LOG_FROM_EXPRS_DEL); 1727 } 1728 control = NULL; 1729 goto finish_express_del; 1730 } 1731 failed_express_del: 1732 /* If we reach here this is a new chunk */ 1733 chk = NULL; 1734 control = NULL; 1735 /* Express for fragmented delivery? */ 1736 if ((asoc->fragmented_delivery_inprogress) && 1737 (stcb->asoc.control_pdapi) && 1738 (asoc->str_of_pdapi == strmno) && 1739 (asoc->ssn_of_pdapi == strmseq) 1740 ) { 1741 control = stcb->asoc.control_pdapi; 1742 if ((chunk_flags & SCTP_DATA_FIRST_FRAG) == SCTP_DATA_FIRST_FRAG) { 1743 /* Can't be another first? */ 1744 goto failed_pdapi_express_del; 1745 } 1746 if (tsn == (control->sinfo_tsn + 1)) { 1747 /* Yep, we can add it on */ 1748 int end = 0; 1749 uint32_t cumack; 1750 1751 if (chunk_flags & SCTP_DATA_LAST_FRAG) { 1752 end = 1; 1753 } 1754 cumack = asoc->cumulative_tsn; 1755 if ((cumack + 1) == tsn) 1756 cumack = tsn; 1757 1758 if (sctp_append_to_readq(stcb->sctp_ep, stcb, control, dmbuf, end, 1759 tsn, 1760 &stcb->sctp_socket->so_rcv)) { 1761 SCTP_PRINTF("Append fails end:%d\n", end); 1762 goto failed_pdapi_express_del; 1763 } 1764 SCTP_STAT_INCR(sctps_recvexpressm); 1765 control->sinfo_tsn = tsn; 1766 asoc->tsn_last_delivered = tsn; 1767 asoc->fragment_flags = chunk_flags; 1768 asoc->tsn_of_pdapi_last_delivered = tsn; 1769 asoc->last_flags_delivered = chunk_flags; 1770 asoc->last_strm_seq_delivered = strmseq; 1771 asoc->last_strm_no_delivered = strmno; 1772 if (end) { 1773 /* clean up the flags and such */ 1774 asoc->fragmented_delivery_inprogress = 0; 1775 if ((chunk_flags & SCTP_DATA_UNORDERED) == 0) { 1776 asoc->strmin[strmno].last_sequence_delivered++; 1777 } 1778 stcb->asoc.control_pdapi = NULL; 1779 if (TAILQ_EMPTY(&asoc->reasmqueue) == 0) { 1780 /* 1781 * There could be another message 1782 * ready 1783 */ 1784 need_reasm_check = 1; 1785 } 1786 } 1787 control = NULL; 1788 goto finish_express_del; 1789 } 1790 } 1791 failed_pdapi_express_del: 1792 control = NULL; 1793 if ((chunk_flags & SCTP_DATA_NOT_FRAG) != SCTP_DATA_NOT_FRAG) { 1794 sctp_alloc_a_chunk(stcb, chk); 1795 if (chk == NULL) { 1796 /* No memory so we drop the chunk */ 1797 SCTP_STAT_INCR(sctps_nomem); 1798 if (last_chunk == 0) { 1799 /* we copied it, free the copy */ 1800 sctp_m_freem(dmbuf); 1801 } 1802 return (0); 1803 } 1804 chk->rec.data.TSN_seq = tsn; 1805 chk->no_fr_allowed = 0; 1806 chk->rec.data.stream_seq = strmseq; 1807 chk->rec.data.stream_number = strmno; 1808 chk->rec.data.payloadtype = protocol_id; 1809 chk->rec.data.context = stcb->asoc.context; 1810 chk->rec.data.doing_fast_retransmit = 0; 1811 chk->rec.data.rcv_flags = chunk_flags; 1812 chk->asoc = asoc; 1813 chk->send_size = the_len; 1814 chk->whoTo = net; 1815 atomic_add_int(&net->ref_count, 1); 1816 chk->data = dmbuf; 1817 } else { 1818 sctp_alloc_a_readq(stcb, control); 1819 sctp_build_readq_entry_mac(control, stcb, asoc->context, net, tsn, 1820 protocol_id, 1821 stcb->asoc.context, 1822 strmno, strmseq, 1823 chunk_flags, 1824 dmbuf); 1825 if (control == NULL) { 1826 /* No memory so we drop the chunk */ 1827 SCTP_STAT_INCR(sctps_nomem); 1828 if (last_chunk == 0) { 1829 /* we copied it, free the copy */ 1830 sctp_m_freem(dmbuf); 1831 } 1832 return (0); 1833 } 1834 control->length = the_len; 1835 } 1836 1837 /* Mark it as received */ 1838 /* Now queue it where it belongs */ 1839 if (control != NULL) { 1840 /* First a sanity check */ 1841 if (asoc->fragmented_delivery_inprogress) { 1842 /* 1843 * Ok, we have a fragmented delivery in progress if 1844 * this chunk is next to deliver OR belongs in our 1845 * view to the reassembly, the peer is evil or 1846 * broken. 1847 */ 1848 uint32_t estimate_tsn; 1849 1850 estimate_tsn = asoc->tsn_last_delivered + 1; 1851 if (TAILQ_EMPTY(&asoc->reasmqueue) && 1852 (estimate_tsn == control->sinfo_tsn)) { 1853 /* Evil/Broke peer */ 1854 sctp_m_freem(control->data); 1855 control->data = NULL; 1856 if (control->whoFrom) { 1857 sctp_free_remote_addr(control->whoFrom); 1858 control->whoFrom = NULL; 1859 } 1860 sctp_free_a_readq(stcb, control); 1861 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 1862 0, M_DONTWAIT, 1, MT_DATA); 1863 if (oper) { 1864 struct sctp_paramhdr *ph; 1865 uint32_t *ippp; 1866 1867 SCTP_BUF_LEN(oper) = 1868 sizeof(struct sctp_paramhdr) + 1869 (3 * sizeof(uint32_t)); 1870 ph = mtod(oper, struct sctp_paramhdr *); 1871 ph->param_type = 1872 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 1873 ph->param_length = htons(SCTP_BUF_LEN(oper)); 1874 ippp = (uint32_t *) (ph + 1); 1875 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_15); 1876 ippp++; 1877 *ippp = tsn; 1878 ippp++; 1879 *ippp = ((strmno << 16) | strmseq); 1880 } 1881 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_15; 1882 sctp_abort_an_association(stcb->sctp_ep, stcb, 1883 SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); 1884 1885 *abort_flag = 1; 1886 return (0); 1887 } else { 1888 if (sctp_does_tsn_belong_to_reasm(asoc, control->sinfo_tsn)) { 1889 sctp_m_freem(control->data); 1890 control->data = NULL; 1891 if (control->whoFrom) { 1892 sctp_free_remote_addr(control->whoFrom); 1893 control->whoFrom = NULL; 1894 } 1895 sctp_free_a_readq(stcb, control); 1896 1897 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 1898 0, M_DONTWAIT, 1, MT_DATA); 1899 if (oper) { 1900 struct sctp_paramhdr *ph; 1901 uint32_t *ippp; 1902 1903 SCTP_BUF_LEN(oper) = 1904 sizeof(struct sctp_paramhdr) + 1905 (3 * sizeof(uint32_t)); 1906 ph = mtod(oper, 1907 struct sctp_paramhdr *); 1908 ph->param_type = 1909 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 1910 ph->param_length = 1911 htons(SCTP_BUF_LEN(oper)); 1912 ippp = (uint32_t *) (ph + 1); 1913 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_16); 1914 ippp++; 1915 *ippp = tsn; 1916 ippp++; 1917 *ippp = ((strmno << 16) | strmseq); 1918 } 1919 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_16; 1920 sctp_abort_an_association(stcb->sctp_ep, 1921 stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); 1922 1923 *abort_flag = 1; 1924 return (0); 1925 } 1926 } 1927 } else { 1928 /* No PDAPI running */ 1929 if (!TAILQ_EMPTY(&asoc->reasmqueue)) { 1930 /* 1931 * Reassembly queue is NOT empty validate 1932 * that this tsn does not need to be in 1933 * reasembly queue. If it does then our peer 1934 * is broken or evil. 1935 */ 1936 if (sctp_does_tsn_belong_to_reasm(asoc, control->sinfo_tsn)) { 1937 sctp_m_freem(control->data); 1938 control->data = NULL; 1939 if (control->whoFrom) { 1940 sctp_free_remote_addr(control->whoFrom); 1941 control->whoFrom = NULL; 1942 } 1943 sctp_free_a_readq(stcb, control); 1944 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 1945 0, M_DONTWAIT, 1, MT_DATA); 1946 if (oper) { 1947 struct sctp_paramhdr *ph; 1948 uint32_t *ippp; 1949 1950 SCTP_BUF_LEN(oper) = 1951 sizeof(struct sctp_paramhdr) + 1952 (3 * sizeof(uint32_t)); 1953 ph = mtod(oper, 1954 struct sctp_paramhdr *); 1955 ph->param_type = 1956 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 1957 ph->param_length = 1958 htons(SCTP_BUF_LEN(oper)); 1959 ippp = (uint32_t *) (ph + 1); 1960 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_17); 1961 ippp++; 1962 *ippp = tsn; 1963 ippp++; 1964 *ippp = ((strmno << 16) | strmseq); 1965 } 1966 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_17; 1967 sctp_abort_an_association(stcb->sctp_ep, 1968 stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); 1969 1970 *abort_flag = 1; 1971 return (0); 1972 } 1973 } 1974 } 1975 /* ok, if we reach here we have passed the sanity checks */ 1976 if (chunk_flags & SCTP_DATA_UNORDERED) { 1977 /* queue directly into socket buffer */ 1978 sctp_add_to_readq(stcb->sctp_ep, stcb, 1979 control, 1980 &stcb->sctp_socket->so_rcv, 1, SCTP_SO_NOT_LOCKED); 1981 } else { 1982 /* 1983 * Special check for when streams are resetting. We 1984 * could be more smart about this and check the 1985 * actual stream to see if it is not being reset.. 1986 * that way we would not create a HOLB when amongst 1987 * streams being reset and those not being reset. 1988 * 1989 * We take complete messages that have a stream reset 1990 * intervening (aka the TSN is after where our 1991 * cum-ack needs to be) off and put them on a 1992 * pending_reply_queue. The reassembly ones we do 1993 * not have to worry about since they are all sorted 1994 * and proceessed by TSN order. It is only the 1995 * singletons I must worry about. 1996 */ 1997 if (((liste = TAILQ_FIRST(&asoc->resetHead)) != NULL) && 1998 ((compare_with_wrap(tsn, liste->tsn, MAX_TSN))) 1999 ) { 2000 /* 2001 * yep its past where we need to reset... go 2002 * ahead and queue it. 2003 */ 2004 if (TAILQ_EMPTY(&asoc->pending_reply_queue)) { 2005 /* first one on */ 2006 TAILQ_INSERT_TAIL(&asoc->pending_reply_queue, control, next); 2007 } else { 2008 struct sctp_queued_to_read *ctlOn; 2009 unsigned char inserted = 0; 2010 2011 ctlOn = TAILQ_FIRST(&asoc->pending_reply_queue); 2012 while (ctlOn) { 2013 if (compare_with_wrap(control->sinfo_tsn, 2014 ctlOn->sinfo_tsn, MAX_TSN)) { 2015 ctlOn = TAILQ_NEXT(ctlOn, next); 2016 } else { 2017 /* found it */ 2018 TAILQ_INSERT_BEFORE(ctlOn, control, next); 2019 inserted = 1; 2020 break; 2021 } 2022 } 2023 if (inserted == 0) { 2024 /* 2025 * must be put at end, use 2026 * prevP (all setup from 2027 * loop) to setup nextP. 2028 */ 2029 TAILQ_INSERT_TAIL(&asoc->pending_reply_queue, control, next); 2030 } 2031 } 2032 } else { 2033 sctp_queue_data_to_stream(stcb, asoc, control, abort_flag); 2034 if (*abort_flag) { 2035 return (0); 2036 } 2037 } 2038 } 2039 } else { 2040 /* Into the re-assembly queue */ 2041 sctp_queue_data_for_reasm(stcb, asoc, chk, abort_flag); 2042 if (*abort_flag) { 2043 /* 2044 * the assoc is now gone and chk was put onto the 2045 * reasm queue, which has all been freed. 2046 */ 2047 *m = NULL; 2048 return (0); 2049 } 2050 } 2051 finish_express_del: 2052 if (compare_with_wrap(tsn, asoc->highest_tsn_inside_map, MAX_TSN)) { 2053 /* we have a new high score */ 2054 asoc->highest_tsn_inside_map = tsn; 2055 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 2056 sctp_log_map(0, 2, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 2057 } 2058 } 2059 if (tsn == (asoc->cumulative_tsn + 1)) { 2060 /* Update cum-ack */ 2061 asoc->cumulative_tsn = tsn; 2062 } 2063 if (last_chunk) { 2064 *m = NULL; 2065 } 2066 if (ordered) { 2067 SCTP_STAT_INCR_COUNTER64(sctps_inorderchunks); 2068 } else { 2069 SCTP_STAT_INCR_COUNTER64(sctps_inunorderchunks); 2070 } 2071 SCTP_STAT_INCR(sctps_recvdata); 2072 /* Set it present please */ 2073 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { 2074 sctp_log_strm_del_alt(stcb, tsn, strmseq, strmno, SCTP_STR_LOG_FROM_MARK_TSN); 2075 } 2076 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 2077 sctp_log_map(asoc->mapping_array_base_tsn, asoc->cumulative_tsn, 2078 asoc->highest_tsn_inside_map, SCTP_MAP_PREPARE_SLIDE); 2079 } 2080 SCTP_TCB_LOCK_ASSERT(stcb); 2081 SCTP_SET_TSN_PRESENT(asoc->mapping_array, gap); 2082 /* check the special flag for stream resets */ 2083 if (((liste = TAILQ_FIRST(&asoc->resetHead)) != NULL) && 2084 ((compare_with_wrap(asoc->cumulative_tsn, liste->tsn, MAX_TSN)) || 2085 (asoc->cumulative_tsn == liste->tsn)) 2086 ) { 2087 /* 2088 * we have finished working through the backlogged TSN's now 2089 * time to reset streams. 1: call reset function. 2: free 2090 * pending_reply space 3: distribute any chunks in 2091 * pending_reply_queue. 2092 */ 2093 struct sctp_queued_to_read *ctl; 2094 2095 sctp_reset_in_stream(stcb, liste->number_entries, liste->req.list_of_streams); 2096 TAILQ_REMOVE(&asoc->resetHead, liste, next_resp); 2097 SCTP_FREE(liste, SCTP_M_STRESET); 2098 /* sa_ignore FREED_MEMORY */ 2099 liste = TAILQ_FIRST(&asoc->resetHead); 2100 ctl = TAILQ_FIRST(&asoc->pending_reply_queue); 2101 if (ctl && (liste == NULL)) { 2102 /* All can be removed */ 2103 while (ctl) { 2104 TAILQ_REMOVE(&asoc->pending_reply_queue, ctl, next); 2105 sctp_queue_data_to_stream(stcb, asoc, ctl, abort_flag); 2106 if (*abort_flag) { 2107 return (0); 2108 } 2109 ctl = TAILQ_FIRST(&asoc->pending_reply_queue); 2110 } 2111 } else if (ctl) { 2112 /* more than one in queue */ 2113 while (!compare_with_wrap(ctl->sinfo_tsn, liste->tsn, MAX_TSN)) { 2114 /* 2115 * if ctl->sinfo_tsn is <= liste->tsn we can 2116 * process it which is the NOT of 2117 * ctl->sinfo_tsn > liste->tsn 2118 */ 2119 TAILQ_REMOVE(&asoc->pending_reply_queue, ctl, next); 2120 sctp_queue_data_to_stream(stcb, asoc, ctl, abort_flag); 2121 if (*abort_flag) { 2122 return (0); 2123 } 2124 ctl = TAILQ_FIRST(&asoc->pending_reply_queue); 2125 } 2126 } 2127 /* 2128 * Now service re-assembly to pick up anything that has been 2129 * held on reassembly queue? 2130 */ 2131 sctp_deliver_reasm_check(stcb, asoc); 2132 need_reasm_check = 0; 2133 } 2134 if (need_reasm_check) { 2135 /* Another one waits ? */ 2136 sctp_deliver_reasm_check(stcb, asoc); 2137 } 2138 return (1); 2139 } 2140 2141 int8_t sctp_map_lookup_tab[256] = { 2142 -1, 0, -1, 1, -1, 0, -1, 2, 2143 -1, 0, -1, 1, -1, 0, -1, 3, 2144 -1, 0, -1, 1, -1, 0, -1, 2, 2145 -1, 0, -1, 1, -1, 0, -1, 4, 2146 -1, 0, -1, 1, -1, 0, -1, 2, 2147 -1, 0, -1, 1, -1, 0, -1, 3, 2148 -1, 0, -1, 1, -1, 0, -1, 2, 2149 -1, 0, -1, 1, -1, 0, -1, 5, 2150 -1, 0, -1, 1, -1, 0, -1, 2, 2151 -1, 0, -1, 1, -1, 0, -1, 3, 2152 -1, 0, -1, 1, -1, 0, -1, 2, 2153 -1, 0, -1, 1, -1, 0, -1, 4, 2154 -1, 0, -1, 1, -1, 0, -1, 2, 2155 -1, 0, -1, 1, -1, 0, -1, 3, 2156 -1, 0, -1, 1, -1, 0, -1, 2, 2157 -1, 0, -1, 1, -1, 0, -1, 6, 2158 -1, 0, -1, 1, -1, 0, -1, 2, 2159 -1, 0, -1, 1, -1, 0, -1, 3, 2160 -1, 0, -1, 1, -1, 0, -1, 2, 2161 -1, 0, -1, 1, -1, 0, -1, 4, 2162 -1, 0, -1, 1, -1, 0, -1, 2, 2163 -1, 0, -1, 1, -1, 0, -1, 3, 2164 -1, 0, -1, 1, -1, 0, -1, 2, 2165 -1, 0, -1, 1, -1, 0, -1, 5, 2166 -1, 0, -1, 1, -1, 0, -1, 2, 2167 -1, 0, -1, 1, -1, 0, -1, 3, 2168 -1, 0, -1, 1, -1, 0, -1, 2, 2169 -1, 0, -1, 1, -1, 0, -1, 4, 2170 -1, 0, -1, 1, -1, 0, -1, 2, 2171 -1, 0, -1, 1, -1, 0, -1, 3, 2172 -1, 0, -1, 1, -1, 0, -1, 2, 2173 -1, 0, -1, 1, -1, 0, -1, 7, 2174 }; 2175 2176 2177 void 2178 sctp_sack_check(struct sctp_tcb *stcb, int ok_to_sack, int was_a_gap, int *abort_flag) 2179 { 2180 /* 2181 * Now we also need to check the mapping array in a couple of ways. 2182 * 1) Did we move the cum-ack point? 2183 */ 2184 struct sctp_association *asoc; 2185 int at; 2186 int last_all_ones = 0; 2187 int slide_from, slide_end, lgap, distance; 2188 uint32_t old_cumack, old_base, old_highest; 2189 unsigned char aux_array[64]; 2190 2191 2192 asoc = &stcb->asoc; 2193 at = 0; 2194 2195 old_cumack = asoc->cumulative_tsn; 2196 old_base = asoc->mapping_array_base_tsn; 2197 old_highest = asoc->highest_tsn_inside_map; 2198 if (asoc->mapping_array_size < 64) 2199 memcpy(aux_array, asoc->mapping_array, 2200 asoc->mapping_array_size); 2201 else 2202 memcpy(aux_array, asoc->mapping_array, 64); 2203 2204 /* 2205 * We could probably improve this a small bit by calculating the 2206 * offset of the current cum-ack as the starting point. 2207 */ 2208 at = 0; 2209 for (slide_from = 0; slide_from < stcb->asoc.mapping_array_size; slide_from++) { 2210 2211 if (asoc->mapping_array[slide_from] == 0xff) { 2212 at += 8; 2213 last_all_ones = 1; 2214 } else { 2215 /* there is a 0 bit */ 2216 at += sctp_map_lookup_tab[asoc->mapping_array[slide_from]]; 2217 last_all_ones = 0; 2218 break; 2219 } 2220 } 2221 asoc->cumulative_tsn = asoc->mapping_array_base_tsn + (at - last_all_ones); 2222 /* at is one off, since in the table a embedded -1 is present */ 2223 at++; 2224 2225 if (compare_with_wrap(asoc->cumulative_tsn, 2226 asoc->highest_tsn_inside_map, 2227 MAX_TSN)) { 2228 #ifdef INVARIANTS 2229 panic("huh, cumack 0x%x greater than high-tsn 0x%x in map", 2230 asoc->cumulative_tsn, asoc->highest_tsn_inside_map); 2231 #else 2232 SCTP_PRINTF("huh, cumack 0x%x greater than high-tsn 0x%x in map - should panic?\n", 2233 asoc->cumulative_tsn, asoc->highest_tsn_inside_map); 2234 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 2235 sctp_log_map(0, 6, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 2236 } 2237 asoc->highest_tsn_inside_map = asoc->cumulative_tsn; 2238 #endif 2239 } 2240 if ((asoc->cumulative_tsn == asoc->highest_tsn_inside_map) && (at >= 8)) { 2241 /* The complete array was completed by a single FR */ 2242 /* higest becomes the cum-ack */ 2243 int clr; 2244 2245 asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 2246 /* clear the array */ 2247 clr = (at >> 3) + 1; 2248 if (clr > asoc->mapping_array_size) { 2249 clr = asoc->mapping_array_size; 2250 } 2251 memset(asoc->mapping_array, 0, clr); 2252 /* base becomes one ahead of the cum-ack */ 2253 asoc->mapping_array_base_tsn = asoc->cumulative_tsn + 1; 2254 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 2255 sctp_log_map(old_base, old_cumack, old_highest, 2256 SCTP_MAP_PREPARE_SLIDE); 2257 sctp_log_map(asoc->mapping_array_base_tsn, asoc->cumulative_tsn, 2258 asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_CLEARED); 2259 } 2260 } else if (at >= 8) { 2261 /* we can slide the mapping array down */ 2262 /* slide_from holds where we hit the first NON 0xff byte */ 2263 2264 /* 2265 * now calculate the ceiling of the move using our highest 2266 * TSN value 2267 */ 2268 if (asoc->highest_tsn_inside_map >= asoc->mapping_array_base_tsn) { 2269 lgap = asoc->highest_tsn_inside_map - 2270 asoc->mapping_array_base_tsn; 2271 } else { 2272 lgap = (MAX_TSN - asoc->mapping_array_base_tsn) + 2273 asoc->highest_tsn_inside_map + 1; 2274 } 2275 slide_end = lgap >> 3; 2276 if (slide_end < slide_from) { 2277 #ifdef INVARIANTS 2278 panic("impossible slide"); 2279 #else 2280 printf("impossible slide?\n"); 2281 return; 2282 #endif 2283 } 2284 if (slide_end > asoc->mapping_array_size) { 2285 #ifdef INVARIANTS 2286 panic("would overrun buffer"); 2287 #else 2288 printf("Gak, would have overrun map end:%d slide_end:%d\n", 2289 asoc->mapping_array_size, slide_end); 2290 slide_end = asoc->mapping_array_size; 2291 #endif 2292 } 2293 distance = (slide_end - slide_from) + 1; 2294 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 2295 sctp_log_map(old_base, old_cumack, old_highest, 2296 SCTP_MAP_PREPARE_SLIDE); 2297 sctp_log_map((uint32_t) slide_from, (uint32_t) slide_end, 2298 (uint32_t) lgap, SCTP_MAP_SLIDE_FROM); 2299 } 2300 if (distance + slide_from > asoc->mapping_array_size || 2301 distance < 0) { 2302 /* 2303 * Here we do NOT slide forward the array so that 2304 * hopefully when more data comes in to fill it up 2305 * we will be able to slide it forward. Really I 2306 * don't think this should happen :-0 2307 */ 2308 2309 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 2310 sctp_log_map((uint32_t) distance, (uint32_t) slide_from, 2311 (uint32_t) asoc->mapping_array_size, 2312 SCTP_MAP_SLIDE_NONE); 2313 } 2314 } else { 2315 int ii; 2316 2317 for (ii = 0; ii < distance; ii++) { 2318 asoc->mapping_array[ii] = 2319 asoc->mapping_array[slide_from + ii]; 2320 } 2321 for (ii = distance; ii <= slide_end; ii++) { 2322 asoc->mapping_array[ii] = 0; 2323 } 2324 asoc->mapping_array_base_tsn += (slide_from << 3); 2325 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 2326 sctp_log_map(asoc->mapping_array_base_tsn, 2327 asoc->cumulative_tsn, asoc->highest_tsn_inside_map, 2328 SCTP_MAP_SLIDE_RESULT); 2329 } 2330 } 2331 } 2332 /* 2333 * Now we need to see if we need to queue a sack or just start the 2334 * timer (if allowed). 2335 */ 2336 if (ok_to_sack) { 2337 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 2338 /* 2339 * Ok special case, in SHUTDOWN-SENT case. here we 2340 * maker sure SACK timer is off and instead send a 2341 * SHUTDOWN and a SACK 2342 */ 2343 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) { 2344 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, 2345 stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_INDATA + SCTP_LOC_18); 2346 } 2347 sctp_send_shutdown(stcb, stcb->asoc.primary_destination); 2348 sctp_send_sack(stcb); 2349 } else { 2350 int is_a_gap; 2351 2352 /* is there a gap now ? */ 2353 is_a_gap = compare_with_wrap(stcb->asoc.highest_tsn_inside_map, 2354 stcb->asoc.cumulative_tsn, MAX_TSN); 2355 2356 /* 2357 * CMT DAC algorithm: increase number of packets 2358 * received since last ack 2359 */ 2360 stcb->asoc.cmt_dac_pkts_rcvd++; 2361 2362 if ((stcb->asoc.send_sack == 1) || /* We need to send a 2363 * SACK */ 2364 ((was_a_gap) && (is_a_gap == 0)) || /* was a gap, but no 2365 * longer is one */ 2366 (stcb->asoc.numduptsns) || /* we have dup's */ 2367 (is_a_gap) || /* is still a gap */ 2368 (stcb->asoc.delayed_ack == 0) || /* Delayed sack disabled */ 2369 (stcb->asoc.data_pkts_seen >= stcb->asoc.sack_freq) /* hit limit of pkts */ 2370 ) { 2371 2372 if ((SCTP_BASE_SYSCTL(sctp_cmt_on_off)) && 2373 (SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) && 2374 (stcb->asoc.send_sack == 0) && 2375 (stcb->asoc.numduptsns == 0) && 2376 (stcb->asoc.delayed_ack) && 2377 (!SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer))) { 2378 2379 /* 2380 * CMT DAC algorithm: With CMT, 2381 * delay acks even in the face of 2382 * 2383 * reordering. Therefore, if acks that 2384 * do not have to be sent because of 2385 * the above reasons, will be 2386 * delayed. That is, acks that would 2387 * have been sent due to gap reports 2388 * will be delayed with DAC. Start 2389 * the delayed ack timer. 2390 */ 2391 sctp_timer_start(SCTP_TIMER_TYPE_RECV, 2392 stcb->sctp_ep, stcb, NULL); 2393 } else { 2394 /* 2395 * Ok we must build a SACK since the 2396 * timer is pending, we got our 2397 * first packet OR there are gaps or 2398 * duplicates. 2399 */ 2400 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer); 2401 sctp_send_sack(stcb); 2402 } 2403 } else { 2404 if (!SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) { 2405 sctp_timer_start(SCTP_TIMER_TYPE_RECV, 2406 stcb->sctp_ep, stcb, NULL); 2407 } 2408 } 2409 } 2410 } 2411 } 2412 2413 void 2414 sctp_service_queues(struct sctp_tcb *stcb, struct sctp_association *asoc) 2415 { 2416 struct sctp_tmit_chunk *chk; 2417 uint32_t tsize; 2418 uint16_t nxt_todel; 2419 2420 if (asoc->fragmented_delivery_inprogress) { 2421 sctp_service_reassembly(stcb, asoc); 2422 } 2423 /* Can we proceed further, i.e. the PD-API is complete */ 2424 if (asoc->fragmented_delivery_inprogress) { 2425 /* no */ 2426 return; 2427 } 2428 /* 2429 * Now is there some other chunk I can deliver from the reassembly 2430 * queue. 2431 */ 2432 doit_again: 2433 chk = TAILQ_FIRST(&asoc->reasmqueue); 2434 if (chk == NULL) { 2435 asoc->size_on_reasm_queue = 0; 2436 asoc->cnt_on_reasm_queue = 0; 2437 return; 2438 } 2439 nxt_todel = asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered + 1; 2440 if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) && 2441 ((nxt_todel == chk->rec.data.stream_seq) || 2442 (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED))) { 2443 /* 2444 * Yep the first one is here. We setup to start reception, 2445 * by backing down the TSN just in case we can't deliver. 2446 */ 2447 2448 /* 2449 * Before we start though either all of the message should 2450 * be here or 1/4 the socket buffer max or nothing on the 2451 * delivery queue and something can be delivered. 2452 */ 2453 if ((sctp_is_all_msg_on_reasm(asoc, &tsize) || 2454 (tsize >= stcb->sctp_ep->partial_delivery_point))) { 2455 asoc->fragmented_delivery_inprogress = 1; 2456 asoc->tsn_last_delivered = chk->rec.data.TSN_seq - 1; 2457 asoc->str_of_pdapi = chk->rec.data.stream_number; 2458 asoc->ssn_of_pdapi = chk->rec.data.stream_seq; 2459 asoc->pdapi_ppid = chk->rec.data.payloadtype; 2460 asoc->fragment_flags = chk->rec.data.rcv_flags; 2461 sctp_service_reassembly(stcb, asoc); 2462 if (asoc->fragmented_delivery_inprogress == 0) { 2463 goto doit_again; 2464 } 2465 } 2466 } 2467 } 2468 2469 int 2470 sctp_process_data(struct mbuf **mm, int iphlen, int *offset, int length, 2471 struct sctphdr *sh, struct sctp_inpcb *inp, struct sctp_tcb *stcb, 2472 struct sctp_nets *net, uint32_t * high_tsn) 2473 { 2474 struct sctp_data_chunk *ch, chunk_buf; 2475 struct sctp_association *asoc; 2476 int num_chunks = 0; /* number of control chunks processed */ 2477 int stop_proc = 0; 2478 int chk_length, break_flag, last_chunk; 2479 int abort_flag = 0, was_a_gap = 0; 2480 struct mbuf *m; 2481 2482 /* set the rwnd */ 2483 sctp_set_rwnd(stcb, &stcb->asoc); 2484 2485 m = *mm; 2486 SCTP_TCB_LOCK_ASSERT(stcb); 2487 asoc = &stcb->asoc; 2488 if (compare_with_wrap(stcb->asoc.highest_tsn_inside_map, 2489 stcb->asoc.cumulative_tsn, MAX_TSN)) { 2490 /* there was a gap before this data was processed */ 2491 was_a_gap = 1; 2492 } 2493 /* 2494 * setup where we got the last DATA packet from for any SACK that 2495 * may need to go out. Don't bump the net. This is done ONLY when a 2496 * chunk is assigned. 2497 */ 2498 asoc->last_data_chunk_from = net; 2499 2500 /*- 2501 * Now before we proceed we must figure out if this is a wasted 2502 * cluster... i.e. it is a small packet sent in and yet the driver 2503 * underneath allocated a full cluster for it. If so we must copy it 2504 * to a smaller mbuf and free up the cluster mbuf. This will help 2505 * with cluster starvation. Note for __Panda__ we don't do this 2506 * since it has clusters all the way down to 64 bytes. 2507 */ 2508 if (SCTP_BUF_LEN(m) < (long)MLEN && SCTP_BUF_NEXT(m) == NULL) { 2509 /* we only handle mbufs that are singletons.. not chains */ 2510 m = sctp_get_mbuf_for_msg(SCTP_BUF_LEN(m), 0, M_DONTWAIT, 1, MT_DATA); 2511 if (m) { 2512 /* ok lets see if we can copy the data up */ 2513 caddr_t *from, *to; 2514 2515 /* get the pointers and copy */ 2516 to = mtod(m, caddr_t *); 2517 from = mtod((*mm), caddr_t *); 2518 memcpy(to, from, SCTP_BUF_LEN((*mm))); 2519 /* copy the length and free up the old */ 2520 SCTP_BUF_LEN(m) = SCTP_BUF_LEN((*mm)); 2521 sctp_m_freem(*mm); 2522 /* sucess, back copy */ 2523 *mm = m; 2524 } else { 2525 /* We are in trouble in the mbuf world .. yikes */ 2526 m = *mm; 2527 } 2528 } 2529 /* get pointer to the first chunk header */ 2530 ch = (struct sctp_data_chunk *)sctp_m_getptr(m, *offset, 2531 sizeof(struct sctp_data_chunk), (uint8_t *) & chunk_buf); 2532 if (ch == NULL) { 2533 return (1); 2534 } 2535 /* 2536 * process all DATA chunks... 2537 */ 2538 *high_tsn = asoc->cumulative_tsn; 2539 break_flag = 0; 2540 asoc->data_pkts_seen++; 2541 while (stop_proc == 0) { 2542 /* validate chunk length */ 2543 chk_length = ntohs(ch->ch.chunk_length); 2544 if (length - *offset < chk_length) { 2545 /* all done, mutulated chunk */ 2546 stop_proc = 1; 2547 break; 2548 } 2549 if (ch->ch.chunk_type == SCTP_DATA) { 2550 if ((size_t)chk_length < sizeof(struct sctp_data_chunk) + 1) { 2551 /* 2552 * Need to send an abort since we had a 2553 * invalid data chunk. 2554 */ 2555 struct mbuf *op_err; 2556 2557 op_err = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 2 * sizeof(uint32_t)), 2558 0, M_DONTWAIT, 1, MT_DATA); 2559 2560 if (op_err) { 2561 struct sctp_paramhdr *ph; 2562 uint32_t *ippp; 2563 2564 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr) + 2565 (2 * sizeof(uint32_t)); 2566 ph = mtod(op_err, struct sctp_paramhdr *); 2567 ph->param_type = 2568 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 2569 ph->param_length = htons(SCTP_BUF_LEN(op_err)); 2570 ippp = (uint32_t *) (ph + 1); 2571 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_19); 2572 ippp++; 2573 *ippp = asoc->cumulative_tsn; 2574 2575 } 2576 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_19; 2577 sctp_abort_association(inp, stcb, m, iphlen, sh, 2578 op_err, 0, net->port); 2579 return (2); 2580 } 2581 #ifdef SCTP_AUDITING_ENABLED 2582 sctp_audit_log(0xB1, 0); 2583 #endif 2584 if (SCTP_SIZE32(chk_length) == (length - *offset)) { 2585 last_chunk = 1; 2586 } else { 2587 last_chunk = 0; 2588 } 2589 if (sctp_process_a_data_chunk(stcb, asoc, mm, *offset, ch, 2590 chk_length, net, high_tsn, &abort_flag, &break_flag, 2591 last_chunk)) { 2592 num_chunks++; 2593 } 2594 if (abort_flag) 2595 return (2); 2596 2597 if (break_flag) { 2598 /* 2599 * Set because of out of rwnd space and no 2600 * drop rep space left. 2601 */ 2602 stop_proc = 1; 2603 break; 2604 } 2605 } else { 2606 /* not a data chunk in the data region */ 2607 switch (ch->ch.chunk_type) { 2608 case SCTP_INITIATION: 2609 case SCTP_INITIATION_ACK: 2610 case SCTP_SELECTIVE_ACK: 2611 case SCTP_HEARTBEAT_REQUEST: 2612 case SCTP_HEARTBEAT_ACK: 2613 case SCTP_ABORT_ASSOCIATION: 2614 case SCTP_SHUTDOWN: 2615 case SCTP_SHUTDOWN_ACK: 2616 case SCTP_OPERATION_ERROR: 2617 case SCTP_COOKIE_ECHO: 2618 case SCTP_COOKIE_ACK: 2619 case SCTP_ECN_ECHO: 2620 case SCTP_ECN_CWR: 2621 case SCTP_SHUTDOWN_COMPLETE: 2622 case SCTP_AUTHENTICATION: 2623 case SCTP_ASCONF_ACK: 2624 case SCTP_PACKET_DROPPED: 2625 case SCTP_STREAM_RESET: 2626 case SCTP_FORWARD_CUM_TSN: 2627 case SCTP_ASCONF: 2628 /* 2629 * Now, what do we do with KNOWN chunks that 2630 * are NOT in the right place? 2631 * 2632 * For now, I do nothing but ignore them. We 2633 * may later want to add sysctl stuff to 2634 * switch out and do either an ABORT() or 2635 * possibly process them. 2636 */ 2637 if (SCTP_BASE_SYSCTL(sctp_strict_data_order)) { 2638 struct mbuf *op_err; 2639 2640 op_err = sctp_generate_invmanparam(SCTP_CAUSE_PROTOCOL_VIOLATION); 2641 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 0, net->port); 2642 return (2); 2643 } 2644 break; 2645 default: 2646 /* unknown chunk type, use bit rules */ 2647 if (ch->ch.chunk_type & 0x40) { 2648 /* Add a error report to the queue */ 2649 struct mbuf *merr; 2650 struct sctp_paramhdr *phd; 2651 2652 merr = sctp_get_mbuf_for_msg(sizeof(*phd), 0, M_DONTWAIT, 1, MT_DATA); 2653 if (merr) { 2654 phd = mtod(merr, struct sctp_paramhdr *); 2655 /* 2656 * We cheat and use param 2657 * type since we did not 2658 * bother to define a error 2659 * cause struct. They are 2660 * the same basic format 2661 * with different names. 2662 */ 2663 phd->param_type = 2664 htons(SCTP_CAUSE_UNRECOG_CHUNK); 2665 phd->param_length = 2666 htons(chk_length + sizeof(*phd)); 2667 SCTP_BUF_LEN(merr) = sizeof(*phd); 2668 SCTP_BUF_NEXT(merr) = SCTP_M_COPYM(m, *offset, 2669 SCTP_SIZE32(chk_length), 2670 M_DONTWAIT); 2671 if (SCTP_BUF_NEXT(merr)) { 2672 sctp_queue_op_err(stcb, merr); 2673 } else { 2674 sctp_m_freem(merr); 2675 } 2676 } 2677 } 2678 if ((ch->ch.chunk_type & 0x80) == 0) { 2679 /* discard the rest of this packet */ 2680 stop_proc = 1; 2681 } /* else skip this bad chunk and 2682 * continue... */ 2683 break; 2684 }; /* switch of chunk type */ 2685 } 2686 *offset += SCTP_SIZE32(chk_length); 2687 if ((*offset >= length) || stop_proc) { 2688 /* no more data left in the mbuf chain */ 2689 stop_proc = 1; 2690 continue; 2691 } 2692 ch = (struct sctp_data_chunk *)sctp_m_getptr(m, *offset, 2693 sizeof(struct sctp_data_chunk), (uint8_t *) & chunk_buf); 2694 if (ch == NULL) { 2695 *offset = length; 2696 stop_proc = 1; 2697 break; 2698 2699 } 2700 } /* while */ 2701 if (break_flag) { 2702 /* 2703 * we need to report rwnd overrun drops. 2704 */ 2705 sctp_send_packet_dropped(stcb, net, *mm, iphlen, 0); 2706 } 2707 if (num_chunks) { 2708 /* 2709 * Did we get data, if so update the time for auto-close and 2710 * give peer credit for being alive. 2711 */ 2712 SCTP_STAT_INCR(sctps_recvpktwithdata); 2713 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 2714 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 2715 stcb->asoc.overall_error_count, 2716 0, 2717 SCTP_FROM_SCTP_INDATA, 2718 __LINE__); 2719 } 2720 stcb->asoc.overall_error_count = 0; 2721 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_last_rcvd); 2722 } 2723 /* now service all of the reassm queue if needed */ 2724 if (!(TAILQ_EMPTY(&asoc->reasmqueue))) 2725 sctp_service_queues(stcb, asoc); 2726 2727 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 2728 /* Assure that we ack right away */ 2729 stcb->asoc.send_sack = 1; 2730 } 2731 /* Start a sack timer or QUEUE a SACK for sending */ 2732 if ((stcb->asoc.cumulative_tsn == stcb->asoc.highest_tsn_inside_map) && 2733 (stcb->asoc.mapping_array[0] != 0xff)) { 2734 if ((stcb->asoc.data_pkts_seen >= stcb->asoc.sack_freq) || 2735 (stcb->asoc.delayed_ack == 0) || 2736 (stcb->asoc.numduptsns) || 2737 (stcb->asoc.send_sack == 1)) { 2738 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) { 2739 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer); 2740 } 2741 sctp_send_sack(stcb); 2742 } else { 2743 if (!SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) { 2744 sctp_timer_start(SCTP_TIMER_TYPE_RECV, 2745 stcb->sctp_ep, stcb, NULL); 2746 } 2747 } 2748 } else { 2749 sctp_sack_check(stcb, 1, was_a_gap, &abort_flag); 2750 } 2751 if (abort_flag) 2752 return (2); 2753 2754 return (0); 2755 } 2756 2757 static void 2758 sctp_handle_segments(struct mbuf *m, int *offset, struct sctp_tcb *stcb, struct sctp_association *asoc, 2759 struct sctp_sack_chunk *ch, uint32_t last_tsn, uint32_t * biggest_tsn_acked, 2760 uint32_t * biggest_newly_acked_tsn, uint32_t * this_sack_lowest_newack, 2761 int num_seg, int *ecn_seg_sums) 2762 { 2763 /************************************************/ 2764 /* process fragments and update sendqueue */ 2765 /************************************************/ 2766 struct sctp_sack *sack; 2767 struct sctp_gap_ack_block *frag, block; 2768 struct sctp_tmit_chunk *tp1; 2769 int i; 2770 unsigned int j; 2771 int num_frs = 0; 2772 2773 uint16_t frag_strt, frag_end, primary_flag_set; 2774 u_long last_frag_high; 2775 2776 /* 2777 * @@@ JRI : TODO: This flag is not used anywhere .. remove? 2778 */ 2779 if (asoc->primary_destination->dest_state & SCTP_ADDR_SWITCH_PRIMARY) { 2780 primary_flag_set = 1; 2781 } else { 2782 primary_flag_set = 0; 2783 } 2784 sack = &ch->sack; 2785 2786 frag = (struct sctp_gap_ack_block *)sctp_m_getptr(m, *offset, 2787 sizeof(struct sctp_gap_ack_block), (uint8_t *) & block); 2788 *offset += sizeof(block); 2789 if (frag == NULL) { 2790 return; 2791 } 2792 tp1 = NULL; 2793 last_frag_high = 0; 2794 for (i = 0; i < num_seg; i++) { 2795 frag_strt = ntohs(frag->start); 2796 frag_end = ntohs(frag->end); 2797 /* some sanity checks on the fargment offsets */ 2798 if (frag_strt > frag_end) { 2799 /* this one is malformed, skip */ 2800 frag++; 2801 continue; 2802 } 2803 if (compare_with_wrap((frag_end + last_tsn), *biggest_tsn_acked, 2804 MAX_TSN)) 2805 *biggest_tsn_acked = frag_end + last_tsn; 2806 2807 /* mark acked dgs and find out the highestTSN being acked */ 2808 if (tp1 == NULL) { 2809 tp1 = TAILQ_FIRST(&asoc->sent_queue); 2810 2811 /* save the locations of the last frags */ 2812 last_frag_high = frag_end + last_tsn; 2813 } else { 2814 /* 2815 * now lets see if we need to reset the queue due to 2816 * a out-of-order SACK fragment 2817 */ 2818 if (compare_with_wrap(frag_strt + last_tsn, 2819 last_frag_high, MAX_TSN)) { 2820 /* 2821 * if the new frag starts after the last TSN 2822 * frag covered, we are ok and this one is 2823 * beyond the last one 2824 */ 2825 ; 2826 } else { 2827 /* 2828 * ok, they have reset us, so we need to 2829 * reset the queue this will cause extra 2830 * hunting but hey, they chose the 2831 * performance hit when they failed to order 2832 * there gaps.. 2833 */ 2834 tp1 = TAILQ_FIRST(&asoc->sent_queue); 2835 } 2836 last_frag_high = frag_end + last_tsn; 2837 } 2838 for (j = frag_strt + last_tsn; (compare_with_wrap((frag_end + last_tsn), j, MAX_TSN)); j++) { 2839 while (tp1) { 2840 if (tp1->rec.data.doing_fast_retransmit) 2841 num_frs++; 2842 2843 /* 2844 * CMT: CUCv2 algorithm. For each TSN being 2845 * processed from the sent queue, track the 2846 * next expected pseudo-cumack, or 2847 * rtx_pseudo_cumack, if required. Separate 2848 * cumack trackers for first transmissions, 2849 * and retransmissions. 2850 */ 2851 if ((tp1->whoTo->find_pseudo_cumack == 1) && (tp1->sent < SCTP_DATAGRAM_RESEND) && 2852 (tp1->snd_count == 1)) { 2853 tp1->whoTo->pseudo_cumack = tp1->rec.data.TSN_seq; 2854 tp1->whoTo->find_pseudo_cumack = 0; 2855 } 2856 if ((tp1->whoTo->find_rtx_pseudo_cumack == 1) && (tp1->sent < SCTP_DATAGRAM_RESEND) && 2857 (tp1->snd_count > 1)) { 2858 tp1->whoTo->rtx_pseudo_cumack = tp1->rec.data.TSN_seq; 2859 tp1->whoTo->find_rtx_pseudo_cumack = 0; 2860 } 2861 if (tp1->rec.data.TSN_seq == j) { 2862 if (tp1->sent != SCTP_DATAGRAM_UNSENT) { 2863 /* 2864 * must be held until 2865 * cum-ack passes 2866 */ 2867 /* 2868 * ECN Nonce: Add the nonce 2869 * value to the sender's 2870 * nonce sum 2871 */ 2872 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 2873 /*- 2874 * If it is less than RESEND, it is 2875 * now no-longer in flight. 2876 * Higher values may already be set 2877 * via previous Gap Ack Blocks... 2878 * i.e. ACKED or RESEND. 2879 */ 2880 if (compare_with_wrap(tp1->rec.data.TSN_seq, 2881 *biggest_newly_acked_tsn, MAX_TSN)) { 2882 *biggest_newly_acked_tsn = tp1->rec.data.TSN_seq; 2883 } 2884 /* 2885 * CMT: SFR algo 2886 * (and HTNA) - set 2887 * saw_newack to 1 2888 * for dest being 2889 * newly acked. 2890 * update 2891 * this_sack_highest_ 2892 * newack if 2893 * appropriate. 2894 */ 2895 if (tp1->rec.data.chunk_was_revoked == 0) 2896 tp1->whoTo->saw_newack = 1; 2897 2898 if (compare_with_wrap(tp1->rec.data.TSN_seq, 2899 tp1->whoTo->this_sack_highest_newack, 2900 MAX_TSN)) { 2901 tp1->whoTo->this_sack_highest_newack = 2902 tp1->rec.data.TSN_seq; 2903 } 2904 /* 2905 * CMT DAC algo: 2906 * also update 2907 * this_sack_lowest_n 2908 * ewack 2909 */ 2910 if (*this_sack_lowest_newack == 0) { 2911 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 2912 sctp_log_sack(*this_sack_lowest_newack, 2913 last_tsn, 2914 tp1->rec.data.TSN_seq, 2915 0, 2916 0, 2917 SCTP_LOG_TSN_ACKED); 2918 } 2919 *this_sack_lowest_newack = tp1->rec.data.TSN_seq; 2920 } 2921 /* 2922 * CMT: CUCv2 2923 * algorithm. If 2924 * (rtx-)pseudo-cumac 2925 * k for corresp 2926 * dest is being 2927 * acked, then we 2928 * have a new 2929 * (rtx-)pseudo-cumac 2930 * k. Set 2931 * new_(rtx_)pseudo_c 2932 * umack to TRUE so 2933 * that the cwnd for 2934 * this dest can be 2935 * updated. Also 2936 * trigger search 2937 * for the next 2938 * expected 2939 * (rtx-)pseudo-cumac 2940 * k. Separate 2941 * pseudo_cumack 2942 * trackers for 2943 * first 2944 * transmissions and 2945 * retransmissions. 2946 */ 2947 if (tp1->rec.data.TSN_seq == tp1->whoTo->pseudo_cumack) { 2948 if (tp1->rec.data.chunk_was_revoked == 0) { 2949 tp1->whoTo->new_pseudo_cumack = 1; 2950 } 2951 tp1->whoTo->find_pseudo_cumack = 1; 2952 } 2953 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 2954 sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK); 2955 } 2956 if (tp1->rec.data.TSN_seq == tp1->whoTo->rtx_pseudo_cumack) { 2957 if (tp1->rec.data.chunk_was_revoked == 0) { 2958 tp1->whoTo->new_pseudo_cumack = 1; 2959 } 2960 tp1->whoTo->find_rtx_pseudo_cumack = 1; 2961 } 2962 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 2963 sctp_log_sack(*biggest_newly_acked_tsn, 2964 last_tsn, 2965 tp1->rec.data.TSN_seq, 2966 frag_strt, 2967 frag_end, 2968 SCTP_LOG_TSN_ACKED); 2969 } 2970 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 2971 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_GAP, 2972 tp1->whoTo->flight_size, 2973 tp1->book_size, 2974 (uintptr_t) tp1->whoTo, 2975 tp1->rec.data.TSN_seq); 2976 } 2977 sctp_flight_size_decrease(tp1); 2978 sctp_total_flight_decrease(stcb, tp1); 2979 2980 tp1->whoTo->net_ack += tp1->send_size; 2981 if (tp1->snd_count < 2) { 2982 /* 2983 * True 2984 * non-retran 2985 * smited 2986 * chunk */ 2987 tp1->whoTo->net_ack2 += tp1->send_size; 2988 2989 /* 2990 * update RTO 2991 * too ? */ 2992 if (tp1->do_rtt) { 2993 tp1->whoTo->RTO = 2994 sctp_calculate_rto(stcb, 2995 asoc, 2996 tp1->whoTo, 2997 &tp1->sent_rcv_time, 2998 sctp_align_safe_nocopy); 2999 tp1->do_rtt = 0; 3000 } 3001 } 3002 } 3003 if (tp1->sent <= SCTP_DATAGRAM_RESEND) { 3004 (*ecn_seg_sums) += tp1->rec.data.ect_nonce; 3005 (*ecn_seg_sums) &= SCTP_SACK_NONCE_SUM; 3006 if (compare_with_wrap(tp1->rec.data.TSN_seq, 3007 asoc->this_sack_highest_gap, 3008 MAX_TSN)) { 3009 asoc->this_sack_highest_gap = 3010 tp1->rec.data.TSN_seq; 3011 } 3012 if (tp1->sent == SCTP_DATAGRAM_RESEND) { 3013 sctp_ucount_decr(asoc->sent_queue_retran_cnt); 3014 #ifdef SCTP_AUDITING_ENABLED 3015 sctp_audit_log(0xB2, 3016 (asoc->sent_queue_retran_cnt & 0x000000ff)); 3017 #endif 3018 } 3019 } 3020 /* 3021 * All chunks NOT UNSENT 3022 * fall through here and are 3023 * marked 3024 */ 3025 tp1->sent = SCTP_DATAGRAM_MARKED; 3026 if (tp1->rec.data.chunk_was_revoked) { 3027 /* deflate the cwnd */ 3028 tp1->whoTo->cwnd -= tp1->book_size; 3029 tp1->rec.data.chunk_was_revoked = 0; 3030 } 3031 } 3032 break; 3033 } /* if (tp1->TSN_seq == j) */ 3034 if (compare_with_wrap(tp1->rec.data.TSN_seq, j, 3035 MAX_TSN)) 3036 break; 3037 3038 tp1 = TAILQ_NEXT(tp1, sctp_next); 3039 } /* end while (tp1) */ 3040 } /* end for (j = fragStart */ 3041 frag = (struct sctp_gap_ack_block *)sctp_m_getptr(m, *offset, 3042 sizeof(struct sctp_gap_ack_block), (uint8_t *) & block); 3043 *offset += sizeof(block); 3044 if (frag == NULL) { 3045 break; 3046 } 3047 } 3048 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3049 if (num_frs) 3050 sctp_log_fr(*biggest_tsn_acked, 3051 *biggest_newly_acked_tsn, 3052 last_tsn, SCTP_FR_LOG_BIGGEST_TSNS); 3053 } 3054 } 3055 3056 static void 3057 sctp_check_for_revoked(struct sctp_tcb *stcb, 3058 struct sctp_association *asoc, uint32_t cumack, 3059 u_long biggest_tsn_acked) 3060 { 3061 struct sctp_tmit_chunk *tp1; 3062 int tot_revoked = 0; 3063 3064 tp1 = TAILQ_FIRST(&asoc->sent_queue); 3065 while (tp1) { 3066 if (compare_with_wrap(tp1->rec.data.TSN_seq, cumack, 3067 MAX_TSN)) { 3068 /* 3069 * ok this guy is either ACK or MARKED. If it is 3070 * ACKED it has been previously acked but not this 3071 * time i.e. revoked. If it is MARKED it was ACK'ed 3072 * again. 3073 */ 3074 if (compare_with_wrap(tp1->rec.data.TSN_seq, biggest_tsn_acked, 3075 MAX_TSN)) 3076 break; 3077 3078 3079 if (tp1->sent == SCTP_DATAGRAM_ACKED) { 3080 /* it has been revoked */ 3081 tp1->sent = SCTP_DATAGRAM_SENT; 3082 tp1->rec.data.chunk_was_revoked = 1; 3083 /* 3084 * We must add this stuff back in to assure 3085 * timers and such get started. 3086 */ 3087 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3088 sctp_misc_ints(SCTP_FLIGHT_LOG_UP_REVOKE, 3089 tp1->whoTo->flight_size, 3090 tp1->book_size, 3091 (uintptr_t) tp1->whoTo, 3092 tp1->rec.data.TSN_seq); 3093 } 3094 sctp_flight_size_increase(tp1); 3095 sctp_total_flight_increase(stcb, tp1); 3096 /* 3097 * We inflate the cwnd to compensate for our 3098 * artificial inflation of the flight_size. 3099 */ 3100 tp1->whoTo->cwnd += tp1->book_size; 3101 tot_revoked++; 3102 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 3103 sctp_log_sack(asoc->last_acked_seq, 3104 cumack, 3105 tp1->rec.data.TSN_seq, 3106 0, 3107 0, 3108 SCTP_LOG_TSN_REVOKED); 3109 } 3110 } else if (tp1->sent == SCTP_DATAGRAM_MARKED) { 3111 /* it has been re-acked in this SACK */ 3112 tp1->sent = SCTP_DATAGRAM_ACKED; 3113 } 3114 } 3115 if (tp1->sent == SCTP_DATAGRAM_UNSENT) 3116 break; 3117 tp1 = TAILQ_NEXT(tp1, sctp_next); 3118 } 3119 if (tot_revoked > 0) { 3120 /* 3121 * Setup the ecn nonce re-sync point. We do this since once 3122 * data is revoked we begin to retransmit things, which do 3123 * NOT have the ECN bits set. This means we are now out of 3124 * sync and must wait until we get back in sync with the 3125 * peer to check ECN bits. 3126 */ 3127 tp1 = TAILQ_FIRST(&asoc->send_queue); 3128 if (tp1 == NULL) { 3129 asoc->nonce_resync_tsn = asoc->sending_seq; 3130 } else { 3131 asoc->nonce_resync_tsn = tp1->rec.data.TSN_seq; 3132 } 3133 asoc->nonce_wait_for_ecne = 0; 3134 asoc->nonce_sum_check = 0; 3135 } 3136 } 3137 3138 static void 3139 sctp_strike_gap_ack_chunks(struct sctp_tcb *stcb, struct sctp_association *asoc, 3140 u_long biggest_tsn_acked, u_long biggest_tsn_newly_acked, u_long this_sack_lowest_newack, int accum_moved) 3141 { 3142 struct sctp_tmit_chunk *tp1; 3143 int strike_flag = 0; 3144 struct timeval now; 3145 int tot_retrans = 0; 3146 uint32_t sending_seq; 3147 struct sctp_nets *net; 3148 int num_dests_sacked = 0; 3149 3150 /* 3151 * select the sending_seq, this is either the next thing ready to be 3152 * sent but not transmitted, OR, the next seq we assign. 3153 */ 3154 tp1 = TAILQ_FIRST(&stcb->asoc.send_queue); 3155 if (tp1 == NULL) { 3156 sending_seq = asoc->sending_seq; 3157 } else { 3158 sending_seq = tp1->rec.data.TSN_seq; 3159 } 3160 3161 /* CMT DAC algo: finding out if SACK is a mixed SACK */ 3162 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) { 3163 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 3164 if (net->saw_newack) 3165 num_dests_sacked++; 3166 } 3167 } 3168 if (stcb->asoc.peer_supports_prsctp) { 3169 (void)SCTP_GETTIME_TIMEVAL(&now); 3170 } 3171 tp1 = TAILQ_FIRST(&asoc->sent_queue); 3172 while (tp1) { 3173 strike_flag = 0; 3174 if (tp1->no_fr_allowed) { 3175 /* this one had a timeout or something */ 3176 tp1 = TAILQ_NEXT(tp1, sctp_next); 3177 continue; 3178 } 3179 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3180 if (tp1->sent < SCTP_DATAGRAM_RESEND) 3181 sctp_log_fr(biggest_tsn_newly_acked, 3182 tp1->rec.data.TSN_seq, 3183 tp1->sent, 3184 SCTP_FR_LOG_CHECK_STRIKE); 3185 } 3186 if (compare_with_wrap(tp1->rec.data.TSN_seq, biggest_tsn_acked, 3187 MAX_TSN) || 3188 tp1->sent == SCTP_DATAGRAM_UNSENT) { 3189 /* done */ 3190 break; 3191 } 3192 if (stcb->asoc.peer_supports_prsctp) { 3193 if ((PR_SCTP_TTL_ENABLED(tp1->flags)) && tp1->sent < SCTP_DATAGRAM_ACKED) { 3194 /* Is it expired? */ 3195 if ( 3196 /* 3197 * TODO sctp_constants.h needs alternative 3198 * time macros when _KERNEL is undefined. 3199 */ 3200 (timevalcmp(&now, &tp1->rec.data.timetodrop, >)) 3201 ) { 3202 /* Yes so drop it */ 3203 if (tp1->data != NULL) { 3204 (void)sctp_release_pr_sctp_chunk(stcb, tp1, 3205 (SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT), 3206 &asoc->sent_queue, SCTP_SO_NOT_LOCKED); 3207 } 3208 tp1 = TAILQ_NEXT(tp1, sctp_next); 3209 continue; 3210 } 3211 } 3212 if ((PR_SCTP_RTX_ENABLED(tp1->flags)) && tp1->sent < SCTP_DATAGRAM_ACKED) { 3213 /* Has it been retransmitted tv_sec times? */ 3214 if (tp1->snd_count > tp1->rec.data.timetodrop.tv_sec) { 3215 /* Yes, so drop it */ 3216 if (tp1->data != NULL) { 3217 (void)sctp_release_pr_sctp_chunk(stcb, tp1, 3218 (SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT), 3219 &asoc->sent_queue, SCTP_SO_NOT_LOCKED); 3220 } 3221 tp1 = TAILQ_NEXT(tp1, sctp_next); 3222 continue; 3223 } 3224 } 3225 } 3226 if (compare_with_wrap(tp1->rec.data.TSN_seq, 3227 asoc->this_sack_highest_gap, MAX_TSN)) { 3228 /* we are beyond the tsn in the sack */ 3229 break; 3230 } 3231 if (tp1->sent >= SCTP_DATAGRAM_RESEND) { 3232 /* either a RESEND, ACKED, or MARKED */ 3233 /* skip */ 3234 tp1 = TAILQ_NEXT(tp1, sctp_next); 3235 continue; 3236 } 3237 /* 3238 * CMT : SFR algo (covers part of DAC and HTNA as well) 3239 */ 3240 if (tp1->whoTo && tp1->whoTo->saw_newack == 0) { 3241 /* 3242 * No new acks were receieved for data sent to this 3243 * dest. Therefore, according to the SFR algo for 3244 * CMT, no data sent to this dest can be marked for 3245 * FR using this SACK. 3246 */ 3247 tp1 = TAILQ_NEXT(tp1, sctp_next); 3248 continue; 3249 } else if (tp1->whoTo && compare_with_wrap(tp1->rec.data.TSN_seq, 3250 tp1->whoTo->this_sack_highest_newack, MAX_TSN)) { 3251 /* 3252 * CMT: New acks were receieved for data sent to 3253 * this dest. But no new acks were seen for data 3254 * sent after tp1. Therefore, according to the SFR 3255 * algo for CMT, tp1 cannot be marked for FR using 3256 * this SACK. This step covers part of the DAC algo 3257 * and the HTNA algo as well. 3258 */ 3259 tp1 = TAILQ_NEXT(tp1, sctp_next); 3260 continue; 3261 } 3262 /* 3263 * Here we check to see if we were have already done a FR 3264 * and if so we see if the biggest TSN we saw in the sack is 3265 * smaller than the recovery point. If so we don't strike 3266 * the tsn... otherwise we CAN strike the TSN. 3267 */ 3268 /* 3269 * @@@ JRI: Check for CMT if (accum_moved && 3270 * asoc->fast_retran_loss_recovery && (sctp_cmt_on_off == 3271 * 0)) { 3272 */ 3273 if (accum_moved && asoc->fast_retran_loss_recovery) { 3274 /* 3275 * Strike the TSN if in fast-recovery and cum-ack 3276 * moved. 3277 */ 3278 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3279 sctp_log_fr(biggest_tsn_newly_acked, 3280 tp1->rec.data.TSN_seq, 3281 tp1->sent, 3282 SCTP_FR_LOG_STRIKE_CHUNK); 3283 } 3284 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3285 tp1->sent++; 3286 } 3287 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) { 3288 /* 3289 * CMT DAC algorithm: If SACK flag is set to 3290 * 0, then lowest_newack test will not pass 3291 * because it would have been set to the 3292 * cumack earlier. If not already to be 3293 * rtx'd, If not a mixed sack and if tp1 is 3294 * not between two sacked TSNs, then mark by 3295 * one more. NOTE that we are marking by one 3296 * additional time since the SACK DAC flag 3297 * indicates that two packets have been 3298 * received after this missing TSN. 3299 */ 3300 if ((tp1->sent < SCTP_DATAGRAM_RESEND) && (num_dests_sacked == 1) && 3301 compare_with_wrap(this_sack_lowest_newack, tp1->rec.data.TSN_seq, MAX_TSN)) { 3302 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3303 sctp_log_fr(16 + num_dests_sacked, 3304 tp1->rec.data.TSN_seq, 3305 tp1->sent, 3306 SCTP_FR_LOG_STRIKE_CHUNK); 3307 } 3308 tp1->sent++; 3309 } 3310 } 3311 } else if ((tp1->rec.data.doing_fast_retransmit) && (SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0)) { 3312 /* 3313 * For those that have done a FR we must take 3314 * special consideration if we strike. I.e the 3315 * biggest_newly_acked must be higher than the 3316 * sending_seq at the time we did the FR. 3317 */ 3318 if ( 3319 #ifdef SCTP_FR_TO_ALTERNATE 3320 /* 3321 * If FR's go to new networks, then we must only do 3322 * this for singly homed asoc's. However if the FR's 3323 * go to the same network (Armando's work) then its 3324 * ok to FR multiple times. 3325 */ 3326 (asoc->numnets < 2) 3327 #else 3328 (1) 3329 #endif 3330 ) { 3331 3332 if ((compare_with_wrap(biggest_tsn_newly_acked, 3333 tp1->rec.data.fast_retran_tsn, MAX_TSN)) || 3334 (biggest_tsn_newly_acked == 3335 tp1->rec.data.fast_retran_tsn)) { 3336 /* 3337 * Strike the TSN, since this ack is 3338 * beyond where things were when we 3339 * did a FR. 3340 */ 3341 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3342 sctp_log_fr(biggest_tsn_newly_acked, 3343 tp1->rec.data.TSN_seq, 3344 tp1->sent, 3345 SCTP_FR_LOG_STRIKE_CHUNK); 3346 } 3347 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3348 tp1->sent++; 3349 } 3350 strike_flag = 1; 3351 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) { 3352 /* 3353 * CMT DAC algorithm: If 3354 * SACK flag is set to 0, 3355 * then lowest_newack test 3356 * will not pass because it 3357 * would have been set to 3358 * the cumack earlier. If 3359 * not already to be rtx'd, 3360 * If not a mixed sack and 3361 * if tp1 is not between two 3362 * sacked TSNs, then mark by 3363 * one more. NOTE that we 3364 * are marking by one 3365 * additional time since the 3366 * SACK DAC flag indicates 3367 * that two packets have 3368 * been received after this 3369 * missing TSN. 3370 */ 3371 if ((tp1->sent < SCTP_DATAGRAM_RESEND) && 3372 (num_dests_sacked == 1) && 3373 compare_with_wrap(this_sack_lowest_newack, 3374 tp1->rec.data.TSN_seq, MAX_TSN)) { 3375 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3376 sctp_log_fr(32 + num_dests_sacked, 3377 tp1->rec.data.TSN_seq, 3378 tp1->sent, 3379 SCTP_FR_LOG_STRIKE_CHUNK); 3380 } 3381 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3382 tp1->sent++; 3383 } 3384 } 3385 } 3386 } 3387 } 3388 /* 3389 * JRI: TODO: remove code for HTNA algo. CMT's SFR 3390 * algo covers HTNA. 3391 */ 3392 } else if (compare_with_wrap(tp1->rec.data.TSN_seq, 3393 biggest_tsn_newly_acked, MAX_TSN)) { 3394 /* 3395 * We don't strike these: This is the HTNA 3396 * algorithm i.e. we don't strike If our TSN is 3397 * larger than the Highest TSN Newly Acked. 3398 */ 3399 ; 3400 } else { 3401 /* Strike the TSN */ 3402 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3403 sctp_log_fr(biggest_tsn_newly_acked, 3404 tp1->rec.data.TSN_seq, 3405 tp1->sent, 3406 SCTP_FR_LOG_STRIKE_CHUNK); 3407 } 3408 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3409 tp1->sent++; 3410 } 3411 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) { 3412 /* 3413 * CMT DAC algorithm: If SACK flag is set to 3414 * 0, then lowest_newack test will not pass 3415 * because it would have been set to the 3416 * cumack earlier. If not already to be 3417 * rtx'd, If not a mixed sack and if tp1 is 3418 * not between two sacked TSNs, then mark by 3419 * one more. NOTE that we are marking by one 3420 * additional time since the SACK DAC flag 3421 * indicates that two packets have been 3422 * received after this missing TSN. 3423 */ 3424 if ((tp1->sent < SCTP_DATAGRAM_RESEND) && (num_dests_sacked == 1) && 3425 compare_with_wrap(this_sack_lowest_newack, tp1->rec.data.TSN_seq, MAX_TSN)) { 3426 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3427 sctp_log_fr(48 + num_dests_sacked, 3428 tp1->rec.data.TSN_seq, 3429 tp1->sent, 3430 SCTP_FR_LOG_STRIKE_CHUNK); 3431 } 3432 tp1->sent++; 3433 } 3434 } 3435 } 3436 if (tp1->sent == SCTP_DATAGRAM_RESEND) { 3437 /* Increment the count to resend */ 3438 struct sctp_nets *alt; 3439 3440 /* printf("OK, we are now ready to FR this guy\n"); */ 3441 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3442 sctp_log_fr(tp1->rec.data.TSN_seq, tp1->snd_count, 3443 0, SCTP_FR_MARKED); 3444 } 3445 if (strike_flag) { 3446 /* This is a subsequent FR */ 3447 SCTP_STAT_INCR(sctps_sendmultfastretrans); 3448 } 3449 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3450 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off)) { 3451 /* 3452 * CMT: Using RTX_SSTHRESH policy for CMT. 3453 * If CMT is being used, then pick dest with 3454 * largest ssthresh for any retransmission. 3455 */ 3456 tp1->no_fr_allowed = 1; 3457 alt = tp1->whoTo; 3458 /* sa_ignore NO_NULL_CHK */ 3459 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_pf)) { 3460 /* 3461 * JRS 5/18/07 - If CMT PF is on, 3462 * use the PF version of 3463 * find_alt_net() 3464 */ 3465 alt = sctp_find_alternate_net(stcb, alt, 2); 3466 } else { 3467 /* 3468 * JRS 5/18/07 - If only CMT is on, 3469 * use the CMT version of 3470 * find_alt_net() 3471 */ 3472 /* sa_ignore NO_NULL_CHK */ 3473 alt = sctp_find_alternate_net(stcb, alt, 1); 3474 } 3475 if (alt == NULL) { 3476 alt = tp1->whoTo; 3477 } 3478 /* 3479 * CUCv2: If a different dest is picked for 3480 * the retransmission, then new 3481 * (rtx-)pseudo_cumack needs to be tracked 3482 * for orig dest. Let CUCv2 track new (rtx-) 3483 * pseudo-cumack always. 3484 */ 3485 if (tp1->whoTo) { 3486 tp1->whoTo->find_pseudo_cumack = 1; 3487 tp1->whoTo->find_rtx_pseudo_cumack = 1; 3488 } 3489 } else {/* CMT is OFF */ 3490 3491 #ifdef SCTP_FR_TO_ALTERNATE 3492 /* Can we find an alternate? */ 3493 alt = sctp_find_alternate_net(stcb, tp1->whoTo, 0); 3494 #else 3495 /* 3496 * default behavior is to NOT retransmit 3497 * FR's to an alternate. Armando Caro's 3498 * paper details why. 3499 */ 3500 alt = tp1->whoTo; 3501 #endif 3502 } 3503 3504 tp1->rec.data.doing_fast_retransmit = 1; 3505 tot_retrans++; 3506 /* mark the sending seq for possible subsequent FR's */ 3507 /* 3508 * printf("Marking TSN for FR new value %x\n", 3509 * (uint32_t)tpi->rec.data.TSN_seq); 3510 */ 3511 if (TAILQ_EMPTY(&asoc->send_queue)) { 3512 /* 3513 * If the queue of send is empty then its 3514 * the next sequence number that will be 3515 * assigned so we subtract one from this to 3516 * get the one we last sent. 3517 */ 3518 tp1->rec.data.fast_retran_tsn = sending_seq; 3519 } else { 3520 /* 3521 * If there are chunks on the send queue 3522 * (unsent data that has made it from the 3523 * stream queues but not out the door, we 3524 * take the first one (which will have the 3525 * lowest TSN) and subtract one to get the 3526 * one we last sent. 3527 */ 3528 struct sctp_tmit_chunk *ttt; 3529 3530 ttt = TAILQ_FIRST(&asoc->send_queue); 3531 tp1->rec.data.fast_retran_tsn = 3532 ttt->rec.data.TSN_seq; 3533 } 3534 3535 if (tp1->do_rtt) { 3536 /* 3537 * this guy had a RTO calculation pending on 3538 * it, cancel it 3539 */ 3540 tp1->do_rtt = 0; 3541 } 3542 /* fix counts and things */ 3543 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3544 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_RSND, 3545 (tp1->whoTo ? (tp1->whoTo->flight_size) : 0), 3546 tp1->book_size, 3547 (uintptr_t) tp1->whoTo, 3548 tp1->rec.data.TSN_seq); 3549 } 3550 if (tp1->whoTo) { 3551 tp1->whoTo->net_ack++; 3552 sctp_flight_size_decrease(tp1); 3553 } 3554 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) { 3555 sctp_log_rwnd(SCTP_INCREASE_PEER_RWND, 3556 asoc->peers_rwnd, tp1->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)); 3557 } 3558 /* add back to the rwnd */ 3559 asoc->peers_rwnd += (tp1->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)); 3560 3561 /* remove from the total flight */ 3562 sctp_total_flight_decrease(stcb, tp1); 3563 if (alt != tp1->whoTo) { 3564 /* yes, there is an alternate. */ 3565 sctp_free_remote_addr(tp1->whoTo); 3566 /* sa_ignore FREED_MEMORY */ 3567 tp1->whoTo = alt; 3568 atomic_add_int(&alt->ref_count, 1); 3569 } 3570 } 3571 tp1 = TAILQ_NEXT(tp1, sctp_next); 3572 } /* while (tp1) */ 3573 3574 if (tot_retrans > 0) { 3575 /* 3576 * Setup the ecn nonce re-sync point. We do this since once 3577 * we go to FR something we introduce a Karn's rule scenario 3578 * and won't know the totals for the ECN bits. 3579 */ 3580 asoc->nonce_resync_tsn = sending_seq; 3581 asoc->nonce_wait_for_ecne = 0; 3582 asoc->nonce_sum_check = 0; 3583 } 3584 } 3585 3586 struct sctp_tmit_chunk * 3587 sctp_try_advance_peer_ack_point(struct sctp_tcb *stcb, 3588 struct sctp_association *asoc) 3589 { 3590 struct sctp_tmit_chunk *tp1, *tp2, *a_adv = NULL; 3591 struct timeval now; 3592 int now_filled = 0; 3593 3594 if (asoc->peer_supports_prsctp == 0) { 3595 return (NULL); 3596 } 3597 tp1 = TAILQ_FIRST(&asoc->sent_queue); 3598 while (tp1) { 3599 if (tp1->sent != SCTP_FORWARD_TSN_SKIP && 3600 tp1->sent != SCTP_DATAGRAM_RESEND) { 3601 /* no chance to advance, out of here */ 3602 break; 3603 } 3604 if (!PR_SCTP_ENABLED(tp1->flags)) { 3605 /* 3606 * We can't fwd-tsn past any that are reliable aka 3607 * retransmitted until the asoc fails. 3608 */ 3609 break; 3610 } 3611 if (!now_filled) { 3612 (void)SCTP_GETTIME_TIMEVAL(&now); 3613 now_filled = 1; 3614 } 3615 tp2 = TAILQ_NEXT(tp1, sctp_next); 3616 /* 3617 * now we got a chunk which is marked for another 3618 * retransmission to a PR-stream but has run out its chances 3619 * already maybe OR has been marked to skip now. Can we skip 3620 * it if its a resend? 3621 */ 3622 if (tp1->sent == SCTP_DATAGRAM_RESEND && 3623 (PR_SCTP_TTL_ENABLED(tp1->flags))) { 3624 /* 3625 * Now is this one marked for resend and its time is 3626 * now up? 3627 */ 3628 if (timevalcmp(&now, &tp1->rec.data.timetodrop, >)) { 3629 /* Yes so drop it */ 3630 if (tp1->data) { 3631 (void)sctp_release_pr_sctp_chunk(stcb, tp1, 3632 (SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT), 3633 &asoc->sent_queue, SCTP_SO_NOT_LOCKED); 3634 } 3635 } else { 3636 /* 3637 * No, we are done when hit one for resend 3638 * whos time as not expired. 3639 */ 3640 break; 3641 } 3642 } 3643 /* 3644 * Ok now if this chunk is marked to drop it we can clean up 3645 * the chunk, advance our peer ack point and we can check 3646 * the next chunk. 3647 */ 3648 if (tp1->sent == SCTP_FORWARD_TSN_SKIP) { 3649 /* advance PeerAckPoint goes forward */ 3650 asoc->advanced_peer_ack_point = tp1->rec.data.TSN_seq; 3651 a_adv = tp1; 3652 /* 3653 * we don't want to de-queue it here. Just wait for 3654 * the next peer SACK to come with a new cumTSN and 3655 * then the chunk will be droped in the normal 3656 * fashion. 3657 */ 3658 if (tp1->data) { 3659 sctp_free_bufspace(stcb, asoc, tp1, 1); 3660 /* 3661 * Maybe there should be another 3662 * notification type 3663 */ 3664 sctp_ulp_notify(SCTP_NOTIFY_DG_FAIL, stcb, 3665 (SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT), 3666 tp1, SCTP_SO_NOT_LOCKED); 3667 sctp_m_freem(tp1->data); 3668 tp1->data = NULL; 3669 if (stcb->sctp_socket) { 3670 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3671 struct socket *so; 3672 3673 so = SCTP_INP_SO(stcb->sctp_ep); 3674 atomic_add_int(&stcb->asoc.refcnt, 1); 3675 SCTP_TCB_UNLOCK(stcb); 3676 SCTP_SOCKET_LOCK(so, 1); 3677 SCTP_TCB_LOCK(stcb); 3678 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3679 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 3680 /* 3681 * assoc was freed while we 3682 * were unlocked 3683 */ 3684 SCTP_SOCKET_UNLOCK(so, 1); 3685 return (NULL); 3686 } 3687 #endif 3688 sctp_sowwakeup(stcb->sctp_ep, stcb->sctp_socket); 3689 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3690 SCTP_SOCKET_UNLOCK(so, 1); 3691 #endif 3692 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) { 3693 sctp_wakeup_log(stcb, tp1->rec.data.TSN_seq, 1, SCTP_WAKESND_FROM_FWDTSN); 3694 } 3695 } 3696 } 3697 } else { 3698 /* 3699 * If it is still in RESEND we can advance no 3700 * further 3701 */ 3702 break; 3703 } 3704 /* 3705 * If we hit here we just dumped tp1, move to next tsn on 3706 * sent queue. 3707 */ 3708 tp1 = tp2; 3709 } 3710 return (a_adv); 3711 } 3712 3713 static void 3714 sctp_fs_audit(struct sctp_association *asoc) 3715 { 3716 struct sctp_tmit_chunk *chk; 3717 int inflight = 0, resend = 0, inbetween = 0, acked = 0, above = 0; 3718 3719 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) { 3720 if (chk->sent < SCTP_DATAGRAM_RESEND) { 3721 inflight++; 3722 } else if (chk->sent == SCTP_DATAGRAM_RESEND) { 3723 resend++; 3724 } else if (chk->sent < SCTP_DATAGRAM_ACKED) { 3725 inbetween++; 3726 } else if (chk->sent > SCTP_DATAGRAM_ACKED) { 3727 above++; 3728 } else { 3729 acked++; 3730 } 3731 } 3732 3733 if ((inflight > 0) || (inbetween > 0)) { 3734 #ifdef INVARIANTS 3735 panic("Flight size-express incorrect? \n"); 3736 #else 3737 SCTP_PRINTF("Flight size-express incorrect inflight:%d inbetween:%d\n", 3738 inflight, inbetween); 3739 #endif 3740 } 3741 } 3742 3743 3744 static void 3745 sctp_window_probe_recovery(struct sctp_tcb *stcb, 3746 struct sctp_association *asoc, 3747 struct sctp_nets *net, 3748 struct sctp_tmit_chunk *tp1) 3749 { 3750 struct sctp_tmit_chunk *chk; 3751 3752 /* First setup this one and get it moved back */ 3753 tp1->sent = SCTP_DATAGRAM_UNSENT; 3754 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3755 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_WP, 3756 tp1->whoTo->flight_size, 3757 tp1->book_size, 3758 (uintptr_t) tp1->whoTo, 3759 tp1->rec.data.TSN_seq); 3760 } 3761 sctp_flight_size_decrease(tp1); 3762 sctp_total_flight_decrease(stcb, tp1); 3763 TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next); 3764 TAILQ_INSERT_HEAD(&asoc->send_queue, tp1, sctp_next); 3765 asoc->sent_queue_cnt--; 3766 asoc->send_queue_cnt++; 3767 /* 3768 * Now all guys marked for RESEND on the sent_queue must be moved 3769 * back too. 3770 */ 3771 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) { 3772 if (chk->sent == SCTP_DATAGRAM_RESEND) { 3773 /* Another chunk to move */ 3774 chk->sent = SCTP_DATAGRAM_UNSENT; 3775 /* It should not be in flight */ 3776 TAILQ_REMOVE(&asoc->sent_queue, chk, sctp_next); 3777 TAILQ_INSERT_AFTER(&asoc->send_queue, tp1, chk, sctp_next); 3778 asoc->sent_queue_cnt--; 3779 asoc->send_queue_cnt++; 3780 sctp_ucount_decr(asoc->sent_queue_retran_cnt); 3781 } 3782 } 3783 } 3784 3785 void 3786 sctp_express_handle_sack(struct sctp_tcb *stcb, uint32_t cumack, 3787 uint32_t rwnd, int nonce_sum_flag, int *abort_now) 3788 { 3789 struct sctp_nets *net; 3790 struct sctp_association *asoc; 3791 struct sctp_tmit_chunk *tp1, *tp2; 3792 uint32_t old_rwnd; 3793 int win_probe_recovery = 0; 3794 int win_probe_recovered = 0; 3795 int j, done_once = 0; 3796 3797 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_SACK_ARRIVALS_ENABLE) { 3798 sctp_misc_ints(SCTP_SACK_LOG_EXPRESS, cumack, 3799 rwnd, stcb->asoc.last_acked_seq, stcb->asoc.peers_rwnd); 3800 } 3801 SCTP_TCB_LOCK_ASSERT(stcb); 3802 #ifdef SCTP_ASOCLOG_OF_TSNS 3803 stcb->asoc.cumack_log[stcb->asoc.cumack_log_at] = cumack; 3804 stcb->asoc.cumack_log_at++; 3805 if (stcb->asoc.cumack_log_at > SCTP_TSN_LOG_SIZE) { 3806 stcb->asoc.cumack_log_at = 0; 3807 } 3808 #endif 3809 asoc = &stcb->asoc; 3810 old_rwnd = asoc->peers_rwnd; 3811 if (compare_with_wrap(asoc->last_acked_seq, cumack, MAX_TSN)) { 3812 /* old ack */ 3813 return; 3814 } else if (asoc->last_acked_seq == cumack) { 3815 /* Window update sack */ 3816 asoc->peers_rwnd = sctp_sbspace_sub(rwnd, 3817 (uint32_t) (asoc->total_flight + (asoc->sent_queue_cnt * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)))); 3818 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 3819 /* SWS sender side engages */ 3820 asoc->peers_rwnd = 0; 3821 } 3822 if (asoc->peers_rwnd > old_rwnd) { 3823 goto again; 3824 } 3825 return; 3826 } 3827 /* First setup for CC stuff */ 3828 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 3829 net->prev_cwnd = net->cwnd; 3830 net->net_ack = 0; 3831 net->net_ack2 = 0; 3832 3833 /* 3834 * CMT: Reset CUC and Fast recovery algo variables before 3835 * SACK processing 3836 */ 3837 net->new_pseudo_cumack = 0; 3838 net->will_exit_fast_recovery = 0; 3839 } 3840 if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) { 3841 uint32_t send_s; 3842 3843 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 3844 tp1 = TAILQ_LAST(&asoc->sent_queue, 3845 sctpchunk_listhead); 3846 send_s = tp1->rec.data.TSN_seq + 1; 3847 } else { 3848 send_s = asoc->sending_seq; 3849 } 3850 if ((cumack == send_s) || 3851 compare_with_wrap(cumack, send_s, MAX_TSN)) { 3852 #ifndef INVARIANTS 3853 struct mbuf *oper; 3854 3855 #endif 3856 #ifdef INVARIANTS 3857 panic("Impossible sack 1"); 3858 #else 3859 *abort_now = 1; 3860 /* XXX */ 3861 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)), 3862 0, M_DONTWAIT, 1, MT_DATA); 3863 if (oper) { 3864 struct sctp_paramhdr *ph; 3865 uint32_t *ippp; 3866 3867 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + 3868 sizeof(uint32_t); 3869 ph = mtod(oper, struct sctp_paramhdr *); 3870 ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 3871 ph->param_length = htons(SCTP_BUF_LEN(oper)); 3872 ippp = (uint32_t *) (ph + 1); 3873 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_25); 3874 } 3875 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_25; 3876 sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); 3877 return; 3878 #endif 3879 } 3880 } 3881 asoc->this_sack_highest_gap = cumack; 3882 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 3883 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 3884 stcb->asoc.overall_error_count, 3885 0, 3886 SCTP_FROM_SCTP_INDATA, 3887 __LINE__); 3888 } 3889 stcb->asoc.overall_error_count = 0; 3890 if (compare_with_wrap(cumack, asoc->last_acked_seq, MAX_TSN)) { 3891 /* process the new consecutive TSN first */ 3892 tp1 = TAILQ_FIRST(&asoc->sent_queue); 3893 while (tp1) { 3894 tp2 = TAILQ_NEXT(tp1, sctp_next); 3895 if (compare_with_wrap(cumack, tp1->rec.data.TSN_seq, 3896 MAX_TSN) || 3897 cumack == tp1->rec.data.TSN_seq) { 3898 if (tp1->sent == SCTP_DATAGRAM_UNSENT) { 3899 printf("Warning, an unsent is now acked?\n"); 3900 } 3901 /* 3902 * ECN Nonce: Add the nonce to the sender's 3903 * nonce sum 3904 */ 3905 asoc->nonce_sum_expect_base += tp1->rec.data.ect_nonce; 3906 if (tp1->sent < SCTP_DATAGRAM_ACKED) { 3907 /* 3908 * If it is less than ACKED, it is 3909 * now no-longer in flight. Higher 3910 * values may occur during marking 3911 */ 3912 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3913 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3914 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_CA, 3915 tp1->whoTo->flight_size, 3916 tp1->book_size, 3917 (uintptr_t) tp1->whoTo, 3918 tp1->rec.data.TSN_seq); 3919 } 3920 sctp_flight_size_decrease(tp1); 3921 /* sa_ignore NO_NULL_CHK */ 3922 sctp_total_flight_decrease(stcb, tp1); 3923 } 3924 tp1->whoTo->net_ack += tp1->send_size; 3925 if (tp1->snd_count < 2) { 3926 /* 3927 * True non-retransmited 3928 * chunk 3929 */ 3930 tp1->whoTo->net_ack2 += 3931 tp1->send_size; 3932 3933 /* update RTO too? */ 3934 if (tp1->do_rtt) { 3935 tp1->whoTo->RTO = 3936 /* 3937 * sa_ignore 3938 * NO_NULL_CHK 3939 */ 3940 sctp_calculate_rto(stcb, 3941 asoc, tp1->whoTo, 3942 &tp1->sent_rcv_time, 3943 sctp_align_safe_nocopy); 3944 tp1->do_rtt = 0; 3945 } 3946 } 3947 /* 3948 * CMT: CUCv2 algorithm. From the 3949 * cumack'd TSNs, for each TSN being 3950 * acked for the first time, set the 3951 * following variables for the 3952 * corresp destination. 3953 * new_pseudo_cumack will trigger a 3954 * cwnd update. 3955 * find_(rtx_)pseudo_cumack will 3956 * trigger search for the next 3957 * expected (rtx-)pseudo-cumack. 3958 */ 3959 tp1->whoTo->new_pseudo_cumack = 1; 3960 tp1->whoTo->find_pseudo_cumack = 1; 3961 tp1->whoTo->find_rtx_pseudo_cumack = 1; 3962 3963 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 3964 /* sa_ignore NO_NULL_CHK */ 3965 sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK); 3966 } 3967 } 3968 if (tp1->sent == SCTP_DATAGRAM_RESEND) { 3969 sctp_ucount_decr(asoc->sent_queue_retran_cnt); 3970 } 3971 if (tp1->rec.data.chunk_was_revoked) { 3972 /* deflate the cwnd */ 3973 tp1->whoTo->cwnd -= tp1->book_size; 3974 tp1->rec.data.chunk_was_revoked = 0; 3975 } 3976 tp1->sent = SCTP_DATAGRAM_ACKED; 3977 TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next); 3978 if (tp1->data) { 3979 /* sa_ignore NO_NULL_CHK */ 3980 sctp_free_bufspace(stcb, asoc, tp1, 1); 3981 sctp_m_freem(tp1->data); 3982 } 3983 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 3984 sctp_log_sack(asoc->last_acked_seq, 3985 cumack, 3986 tp1->rec.data.TSN_seq, 3987 0, 3988 0, 3989 SCTP_LOG_FREE_SENT); 3990 } 3991 tp1->data = NULL; 3992 asoc->sent_queue_cnt--; 3993 sctp_free_a_chunk(stcb, tp1); 3994 tp1 = tp2; 3995 } else { 3996 break; 3997 } 3998 } 3999 4000 } 4001 /* sa_ignore NO_NULL_CHK */ 4002 if (stcb->sctp_socket) { 4003 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4004 struct socket *so; 4005 4006 #endif 4007 4008 SOCKBUF_LOCK(&stcb->sctp_socket->so_snd); 4009 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) { 4010 /* sa_ignore NO_NULL_CHK */ 4011 sctp_wakeup_log(stcb, cumack, 1, SCTP_WAKESND_FROM_SACK); 4012 } 4013 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4014 so = SCTP_INP_SO(stcb->sctp_ep); 4015 atomic_add_int(&stcb->asoc.refcnt, 1); 4016 SCTP_TCB_UNLOCK(stcb); 4017 SCTP_SOCKET_LOCK(so, 1); 4018 SCTP_TCB_LOCK(stcb); 4019 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4020 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 4021 /* assoc was freed while we were unlocked */ 4022 SCTP_SOCKET_UNLOCK(so, 1); 4023 return; 4024 } 4025 #endif 4026 sctp_sowwakeup_locked(stcb->sctp_ep, stcb->sctp_socket); 4027 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4028 SCTP_SOCKET_UNLOCK(so, 1); 4029 #endif 4030 } else { 4031 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) { 4032 sctp_wakeup_log(stcb, cumack, 1, SCTP_NOWAKE_FROM_SACK); 4033 } 4034 } 4035 4036 /* JRS - Use the congestion control given in the CC module */ 4037 if (asoc->last_acked_seq != cumack) 4038 asoc->cc_functions.sctp_cwnd_update_after_sack(stcb, asoc, 1, 0, 0); 4039 4040 asoc->last_acked_seq = cumack; 4041 4042 if (TAILQ_EMPTY(&asoc->sent_queue)) { 4043 /* nothing left in-flight */ 4044 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4045 net->flight_size = 0; 4046 net->partial_bytes_acked = 0; 4047 } 4048 asoc->total_flight = 0; 4049 asoc->total_flight_count = 0; 4050 } 4051 /* Fix up the a-p-a-p for future PR-SCTP sends */ 4052 if (compare_with_wrap(cumack, asoc->advanced_peer_ack_point, MAX_TSN)) { 4053 asoc->advanced_peer_ack_point = cumack; 4054 } 4055 /* ECN Nonce updates */ 4056 if (asoc->ecn_nonce_allowed) { 4057 if (asoc->nonce_sum_check) { 4058 if (nonce_sum_flag != ((asoc->nonce_sum_expect_base) & SCTP_SACK_NONCE_SUM)) { 4059 if (asoc->nonce_wait_for_ecne == 0) { 4060 struct sctp_tmit_chunk *lchk; 4061 4062 lchk = TAILQ_FIRST(&asoc->send_queue); 4063 asoc->nonce_wait_for_ecne = 1; 4064 if (lchk) { 4065 asoc->nonce_wait_tsn = lchk->rec.data.TSN_seq; 4066 } else { 4067 asoc->nonce_wait_tsn = asoc->sending_seq; 4068 } 4069 } else { 4070 if (compare_with_wrap(asoc->last_acked_seq, asoc->nonce_wait_tsn, MAX_TSN) || 4071 (asoc->last_acked_seq == asoc->nonce_wait_tsn)) { 4072 /* 4073 * Misbehaving peer. We need 4074 * to react to this guy 4075 */ 4076 asoc->ecn_allowed = 0; 4077 asoc->ecn_nonce_allowed = 0; 4078 } 4079 } 4080 } 4081 } else { 4082 /* See if Resynchronization Possible */ 4083 if (compare_with_wrap(asoc->last_acked_seq, asoc->nonce_resync_tsn, MAX_TSN)) { 4084 asoc->nonce_sum_check = 1; 4085 /* 4086 * now we must calculate what the base is. 4087 * We do this based on two things, we know 4088 * the total's for all the segments 4089 * gap-acked in the SACK (none), We also 4090 * know the SACK's nonce sum, its in 4091 * nonce_sum_flag. So we can build a truth 4092 * table to back-calculate the new value of 4093 * asoc->nonce_sum_expect_base: 4094 * 4095 * SACK-flag-Value Seg-Sums Base 0 0 0 4096 * 1 0 1 0 1 1 1 4097 * 1 0 4098 */ 4099 asoc->nonce_sum_expect_base = (0 ^ nonce_sum_flag) & SCTP_SACK_NONCE_SUM; 4100 } 4101 } 4102 } 4103 /* RWND update */ 4104 asoc->peers_rwnd = sctp_sbspace_sub(rwnd, 4105 (uint32_t) (asoc->total_flight + (asoc->sent_queue_cnt * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)))); 4106 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4107 /* SWS sender side engages */ 4108 asoc->peers_rwnd = 0; 4109 } 4110 if (asoc->peers_rwnd > old_rwnd) { 4111 win_probe_recovery = 1; 4112 } 4113 /* Now assure a timer where data is queued at */ 4114 again: 4115 j = 0; 4116 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4117 if (win_probe_recovery && (net->window_probe)) { 4118 net->window_probe = 0; 4119 win_probe_recovered = 1; 4120 /* 4121 * Find first chunk that was used with window probe 4122 * and clear the sent 4123 */ 4124 /* sa_ignore FREED_MEMORY */ 4125 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 4126 if (tp1->window_probe) { 4127 /* move back to data send queue */ 4128 sctp_window_probe_recovery(stcb, asoc, net, tp1); 4129 break; 4130 } 4131 } 4132 } 4133 if (net->flight_size) { 4134 int to_ticks; 4135 4136 if (net->RTO == 0) { 4137 to_ticks = MSEC_TO_TICKS(stcb->asoc.initial_rto); 4138 } else { 4139 to_ticks = MSEC_TO_TICKS(net->RTO); 4140 } 4141 j++; 4142 (void)SCTP_OS_TIMER_START(&net->rxt_timer.timer, to_ticks, 4143 sctp_timeout_handler, &net->rxt_timer); 4144 } else { 4145 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { 4146 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 4147 stcb, net, 4148 SCTP_FROM_SCTP_INDATA + SCTP_LOC_22); 4149 } 4150 if (SCTP_BASE_SYSCTL(sctp_early_fr)) { 4151 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) { 4152 SCTP_STAT_INCR(sctps_earlyfrstpidsck4); 4153 sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net, 4154 SCTP_FROM_SCTP_INDATA + SCTP_LOC_23); 4155 } 4156 } 4157 } 4158 } 4159 if ((j == 0) && 4160 (!TAILQ_EMPTY(&asoc->sent_queue)) && 4161 (asoc->sent_queue_retran_cnt == 0) && 4162 (win_probe_recovered == 0) && 4163 (done_once == 0)) { 4164 /* huh, this should not happen */ 4165 sctp_fs_audit(asoc); 4166 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4167 net->flight_size = 0; 4168 } 4169 asoc->total_flight = 0; 4170 asoc->total_flight_count = 0; 4171 asoc->sent_queue_retran_cnt = 0; 4172 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 4173 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 4174 sctp_flight_size_increase(tp1); 4175 sctp_total_flight_increase(stcb, tp1); 4176 } else if (tp1->sent == SCTP_DATAGRAM_RESEND) { 4177 asoc->sent_queue_retran_cnt++; 4178 } 4179 } 4180 done_once = 1; 4181 goto again; 4182 } 4183 /**********************************/ 4184 /* Now what about shutdown issues */ 4185 /**********************************/ 4186 if (TAILQ_EMPTY(&asoc->send_queue) && TAILQ_EMPTY(&asoc->sent_queue)) { 4187 /* nothing left on sendqueue.. consider done */ 4188 /* clean up */ 4189 if ((asoc->stream_queue_cnt == 1) && 4190 ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) || 4191 (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED)) && 4192 (asoc->locked_on_sending) 4193 ) { 4194 struct sctp_stream_queue_pending *sp; 4195 4196 /* 4197 * I may be in a state where we got all across.. but 4198 * cannot write more due to a shutdown... we abort 4199 * since the user did not indicate EOR in this case. 4200 * The sp will be cleaned during free of the asoc. 4201 */ 4202 sp = TAILQ_LAST(&((asoc->locked_on_sending)->outqueue), 4203 sctp_streamhead); 4204 if ((sp) && (sp->length == 0)) { 4205 /* Let cleanup code purge it */ 4206 if (sp->msg_is_complete) { 4207 asoc->stream_queue_cnt--; 4208 } else { 4209 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT; 4210 asoc->locked_on_sending = NULL; 4211 asoc->stream_queue_cnt--; 4212 } 4213 } 4214 } 4215 if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) && 4216 (asoc->stream_queue_cnt == 0)) { 4217 if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) { 4218 /* Need to abort here */ 4219 struct mbuf *oper; 4220 4221 abort_out_now: 4222 *abort_now = 1; 4223 /* XXX */ 4224 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)), 4225 0, M_DONTWAIT, 1, MT_DATA); 4226 if (oper) { 4227 struct sctp_paramhdr *ph; 4228 uint32_t *ippp; 4229 4230 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + 4231 sizeof(uint32_t); 4232 ph = mtod(oper, struct sctp_paramhdr *); 4233 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT); 4234 ph->param_length = htons(SCTP_BUF_LEN(oper)); 4235 ippp = (uint32_t *) (ph + 1); 4236 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_24); 4237 } 4238 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_24; 4239 sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_RESPONSE_TO_USER_REQ, oper, SCTP_SO_NOT_LOCKED); 4240 } else { 4241 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 4242 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 4243 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 4244 } 4245 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT); 4246 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 4247 sctp_stop_timers_for_shutdown(stcb); 4248 sctp_send_shutdown(stcb, 4249 stcb->asoc.primary_destination); 4250 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, 4251 stcb->sctp_ep, stcb, asoc->primary_destination); 4252 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 4253 stcb->sctp_ep, stcb, asoc->primary_destination); 4254 } 4255 } else if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) && 4256 (asoc->stream_queue_cnt == 0)) { 4257 if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) { 4258 goto abort_out_now; 4259 } 4260 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 4261 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 4262 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 4263 sctp_send_shutdown_ack(stcb, 4264 stcb->asoc.primary_destination); 4265 4266 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, 4267 stcb->sctp_ep, stcb, asoc->primary_destination); 4268 } 4269 } 4270 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_RWND_LOGGING_ENABLE) { 4271 sctp_misc_ints(SCTP_SACK_RWND_UPDATE, 4272 rwnd, 4273 stcb->asoc.peers_rwnd, 4274 stcb->asoc.total_flight, 4275 stcb->asoc.total_output_queue_size); 4276 } 4277 } 4278 4279 void 4280 sctp_handle_sack(struct mbuf *m, int offset, 4281 struct sctp_sack_chunk *ch, struct sctp_tcb *stcb, 4282 struct sctp_nets *net_from, int *abort_now, int sack_len, uint32_t rwnd) 4283 { 4284 struct sctp_association *asoc; 4285 struct sctp_sack *sack; 4286 struct sctp_tmit_chunk *tp1, *tp2; 4287 uint32_t cum_ack, last_tsn, biggest_tsn_acked, biggest_tsn_newly_acked, 4288 this_sack_lowest_newack; 4289 uint32_t sav_cum_ack; 4290 uint16_t num_seg, num_dup; 4291 uint16_t wake_him = 0; 4292 unsigned int sack_length; 4293 uint32_t send_s = 0; 4294 long j; 4295 int accum_moved = 0; 4296 int will_exit_fast_recovery = 0; 4297 uint32_t a_rwnd, old_rwnd; 4298 int win_probe_recovery = 0; 4299 int win_probe_recovered = 0; 4300 struct sctp_nets *net = NULL; 4301 int nonce_sum_flag, ecn_seg_sums = 0; 4302 int done_once; 4303 uint8_t reneged_all = 0; 4304 uint8_t cmt_dac_flag; 4305 4306 /* 4307 * we take any chance we can to service our queues since we cannot 4308 * get awoken when the socket is read from :< 4309 */ 4310 /* 4311 * Now perform the actual SACK handling: 1) Verify that it is not an 4312 * old sack, if so discard. 2) If there is nothing left in the send 4313 * queue (cum-ack is equal to last acked) then you have a duplicate 4314 * too, update any rwnd change and verify no timers are running. 4315 * then return. 3) Process any new consequtive data i.e. cum-ack 4316 * moved process these first and note that it moved. 4) Process any 4317 * sack blocks. 5) Drop any acked from the queue. 6) Check for any 4318 * revoked blocks and mark. 7) Update the cwnd. 8) Nothing left, 4319 * sync up flightsizes and things, stop all timers and also check 4320 * for shutdown_pending state. If so then go ahead and send off the 4321 * shutdown. If in shutdown recv, send off the shutdown-ack and 4322 * start that timer, Ret. 9) Strike any non-acked things and do FR 4323 * procedure if needed being sure to set the FR flag. 10) Do pr-sctp 4324 * procedures. 11) Apply any FR penalties. 12) Assure we will SACK 4325 * if in shutdown_recv state. 4326 */ 4327 SCTP_TCB_LOCK_ASSERT(stcb); 4328 sack = &ch->sack; 4329 /* CMT DAC algo */ 4330 this_sack_lowest_newack = 0; 4331 j = 0; 4332 sack_length = (unsigned int)sack_len; 4333 /* ECN Nonce */ 4334 SCTP_STAT_INCR(sctps_slowpath_sack); 4335 nonce_sum_flag = ch->ch.chunk_flags & SCTP_SACK_NONCE_SUM; 4336 cum_ack = last_tsn = ntohl(sack->cum_tsn_ack); 4337 #ifdef SCTP_ASOCLOG_OF_TSNS 4338 stcb->asoc.cumack_log[stcb->asoc.cumack_log_at] = cum_ack; 4339 stcb->asoc.cumack_log_at++; 4340 if (stcb->asoc.cumack_log_at > SCTP_TSN_LOG_SIZE) { 4341 stcb->asoc.cumack_log_at = 0; 4342 } 4343 #endif 4344 num_seg = ntohs(sack->num_gap_ack_blks); 4345 a_rwnd = rwnd; 4346 4347 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_SACK_ARRIVALS_ENABLE) { 4348 sctp_misc_ints(SCTP_SACK_LOG_NORMAL, cum_ack, 4349 rwnd, stcb->asoc.last_acked_seq, stcb->asoc.peers_rwnd); 4350 } 4351 /* CMT DAC algo */ 4352 cmt_dac_flag = ch->ch.chunk_flags & SCTP_SACK_CMT_DAC; 4353 num_dup = ntohs(sack->num_dup_tsns); 4354 4355 old_rwnd = stcb->asoc.peers_rwnd; 4356 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4357 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4358 stcb->asoc.overall_error_count, 4359 0, 4360 SCTP_FROM_SCTP_INDATA, 4361 __LINE__); 4362 } 4363 stcb->asoc.overall_error_count = 0; 4364 asoc = &stcb->asoc; 4365 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 4366 sctp_log_sack(asoc->last_acked_seq, 4367 cum_ack, 4368 0, 4369 num_seg, 4370 num_dup, 4371 SCTP_LOG_NEW_SACK); 4372 } 4373 if ((num_dup) && (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_FR_LOGGING_ENABLE | SCTP_EARLYFR_LOGGING_ENABLE))) { 4374 int off_to_dup, iii; 4375 uint32_t *dupdata, dblock; 4376 4377 off_to_dup = (num_seg * sizeof(struct sctp_gap_ack_block)) + sizeof(struct sctp_sack_chunk); 4378 if ((off_to_dup + (num_dup * sizeof(uint32_t))) <= sack_length) { 4379 dupdata = (uint32_t *) sctp_m_getptr(m, off_to_dup, 4380 sizeof(uint32_t), (uint8_t *) & dblock); 4381 off_to_dup += sizeof(uint32_t); 4382 if (dupdata) { 4383 for (iii = 0; iii < num_dup; iii++) { 4384 sctp_log_fr(*dupdata, 0, 0, SCTP_FR_DUPED); 4385 dupdata = (uint32_t *) sctp_m_getptr(m, off_to_dup, 4386 sizeof(uint32_t), (uint8_t *) & dblock); 4387 if (dupdata == NULL) 4388 break; 4389 off_to_dup += sizeof(uint32_t); 4390 } 4391 } 4392 } else { 4393 SCTP_PRINTF("Size invalid offset to dups:%d number dups:%d sack_len:%d num gaps:%d\n", 4394 off_to_dup, num_dup, sack_length, num_seg); 4395 } 4396 } 4397 if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) { 4398 /* reality check */ 4399 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 4400 tp1 = TAILQ_LAST(&asoc->sent_queue, 4401 sctpchunk_listhead); 4402 send_s = tp1->rec.data.TSN_seq + 1; 4403 } else { 4404 send_s = asoc->sending_seq; 4405 } 4406 if (cum_ack == send_s || 4407 compare_with_wrap(cum_ack, send_s, MAX_TSN)) { 4408 #ifndef INVARIANTS 4409 struct mbuf *oper; 4410 4411 #endif 4412 #ifdef INVARIANTS 4413 hopeless_peer: 4414 panic("Impossible sack 1"); 4415 #else 4416 4417 4418 /* 4419 * no way, we have not even sent this TSN out yet. 4420 * Peer is hopelessly messed up with us. 4421 */ 4422 hopeless_peer: 4423 *abort_now = 1; 4424 /* XXX */ 4425 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)), 4426 0, M_DONTWAIT, 1, MT_DATA); 4427 if (oper) { 4428 struct sctp_paramhdr *ph; 4429 uint32_t *ippp; 4430 4431 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + 4432 sizeof(uint32_t); 4433 ph = mtod(oper, struct sctp_paramhdr *); 4434 ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 4435 ph->param_length = htons(SCTP_BUF_LEN(oper)); 4436 ippp = (uint32_t *) (ph + 1); 4437 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_25); 4438 } 4439 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_25; 4440 sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); 4441 return; 4442 #endif 4443 } 4444 } 4445 /**********************/ 4446 /* 1) check the range */ 4447 /**********************/ 4448 if (compare_with_wrap(asoc->last_acked_seq, last_tsn, MAX_TSN)) { 4449 /* acking something behind */ 4450 return; 4451 } 4452 sav_cum_ack = asoc->last_acked_seq; 4453 4454 /* update the Rwnd of the peer */ 4455 if (TAILQ_EMPTY(&asoc->sent_queue) && 4456 TAILQ_EMPTY(&asoc->send_queue) && 4457 (asoc->stream_queue_cnt == 0) 4458 ) { 4459 /* nothing left on send/sent and strmq */ 4460 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) { 4461 sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK, 4462 asoc->peers_rwnd, 0, 0, a_rwnd); 4463 } 4464 asoc->peers_rwnd = a_rwnd; 4465 if (asoc->sent_queue_retran_cnt) { 4466 asoc->sent_queue_retran_cnt = 0; 4467 } 4468 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4469 /* SWS sender side engages */ 4470 asoc->peers_rwnd = 0; 4471 } 4472 /* stop any timers */ 4473 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4474 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 4475 stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_26); 4476 if (SCTP_BASE_SYSCTL(sctp_early_fr)) { 4477 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) { 4478 SCTP_STAT_INCR(sctps_earlyfrstpidsck1); 4479 sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net, 4480 SCTP_FROM_SCTP_INDATA + SCTP_LOC_26); 4481 } 4482 } 4483 net->partial_bytes_acked = 0; 4484 net->flight_size = 0; 4485 } 4486 asoc->total_flight = 0; 4487 asoc->total_flight_count = 0; 4488 return; 4489 } 4490 /* 4491 * We init netAckSz and netAckSz2 to 0. These are used to track 2 4492 * things. The total byte count acked is tracked in netAckSz AND 4493 * netAck2 is used to track the total bytes acked that are un- 4494 * amibguious and were never retransmitted. We track these on a per 4495 * destination address basis. 4496 */ 4497 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4498 net->prev_cwnd = net->cwnd; 4499 net->net_ack = 0; 4500 net->net_ack2 = 0; 4501 4502 /* 4503 * CMT: Reset CUC and Fast recovery algo variables before 4504 * SACK processing 4505 */ 4506 net->new_pseudo_cumack = 0; 4507 net->will_exit_fast_recovery = 0; 4508 } 4509 /* process the new consecutive TSN first */ 4510 tp1 = TAILQ_FIRST(&asoc->sent_queue); 4511 while (tp1) { 4512 if (compare_with_wrap(last_tsn, tp1->rec.data.TSN_seq, 4513 MAX_TSN) || 4514 last_tsn == tp1->rec.data.TSN_seq) { 4515 if (tp1->sent != SCTP_DATAGRAM_UNSENT) { 4516 /* 4517 * ECN Nonce: Add the nonce to the sender's 4518 * nonce sum 4519 */ 4520 asoc->nonce_sum_expect_base += tp1->rec.data.ect_nonce; 4521 accum_moved = 1; 4522 if (tp1->sent < SCTP_DATAGRAM_ACKED) { 4523 /* 4524 * If it is less than ACKED, it is 4525 * now no-longer in flight. Higher 4526 * values may occur during marking 4527 */ 4528 if ((tp1->whoTo->dest_state & 4529 SCTP_ADDR_UNCONFIRMED) && 4530 (tp1->snd_count < 2)) { 4531 /* 4532 * If there was no retran 4533 * and the address is 4534 * un-confirmed and we sent 4535 * there and are now 4536 * sacked.. its confirmed, 4537 * mark it so. 4538 */ 4539 tp1->whoTo->dest_state &= 4540 ~SCTP_ADDR_UNCONFIRMED; 4541 } 4542 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 4543 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 4544 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_CA, 4545 tp1->whoTo->flight_size, 4546 tp1->book_size, 4547 (uintptr_t) tp1->whoTo, 4548 tp1->rec.data.TSN_seq); 4549 } 4550 sctp_flight_size_decrease(tp1); 4551 sctp_total_flight_decrease(stcb, tp1); 4552 } 4553 tp1->whoTo->net_ack += tp1->send_size; 4554 4555 /* CMT SFR and DAC algos */ 4556 this_sack_lowest_newack = tp1->rec.data.TSN_seq; 4557 tp1->whoTo->saw_newack = 1; 4558 4559 if (tp1->snd_count < 2) { 4560 /* 4561 * True non-retransmited 4562 * chunk 4563 */ 4564 tp1->whoTo->net_ack2 += 4565 tp1->send_size; 4566 4567 /* update RTO too? */ 4568 if (tp1->do_rtt) { 4569 tp1->whoTo->RTO = 4570 sctp_calculate_rto(stcb, 4571 asoc, tp1->whoTo, 4572 &tp1->sent_rcv_time, 4573 sctp_align_safe_nocopy); 4574 tp1->do_rtt = 0; 4575 } 4576 } 4577 /* 4578 * CMT: CUCv2 algorithm. From the 4579 * cumack'd TSNs, for each TSN being 4580 * acked for the first time, set the 4581 * following variables for the 4582 * corresp destination. 4583 * new_pseudo_cumack will trigger a 4584 * cwnd update. 4585 * find_(rtx_)pseudo_cumack will 4586 * trigger search for the next 4587 * expected (rtx-)pseudo-cumack. 4588 */ 4589 tp1->whoTo->new_pseudo_cumack = 1; 4590 tp1->whoTo->find_pseudo_cumack = 1; 4591 tp1->whoTo->find_rtx_pseudo_cumack = 1; 4592 4593 4594 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 4595 sctp_log_sack(asoc->last_acked_seq, 4596 cum_ack, 4597 tp1->rec.data.TSN_seq, 4598 0, 4599 0, 4600 SCTP_LOG_TSN_ACKED); 4601 } 4602 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 4603 sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK); 4604 } 4605 } 4606 if (tp1->sent == SCTP_DATAGRAM_RESEND) { 4607 sctp_ucount_decr(asoc->sent_queue_retran_cnt); 4608 #ifdef SCTP_AUDITING_ENABLED 4609 sctp_audit_log(0xB3, 4610 (asoc->sent_queue_retran_cnt & 0x000000ff)); 4611 #endif 4612 } 4613 if (tp1->rec.data.chunk_was_revoked) { 4614 /* deflate the cwnd */ 4615 tp1->whoTo->cwnd -= tp1->book_size; 4616 tp1->rec.data.chunk_was_revoked = 0; 4617 } 4618 tp1->sent = SCTP_DATAGRAM_ACKED; 4619 } 4620 } else { 4621 break; 4622 } 4623 tp1 = TAILQ_NEXT(tp1, sctp_next); 4624 } 4625 biggest_tsn_newly_acked = biggest_tsn_acked = last_tsn; 4626 /* always set this up to cum-ack */ 4627 asoc->this_sack_highest_gap = last_tsn; 4628 4629 /* Move offset up to point to gaps/dups */ 4630 offset += sizeof(struct sctp_sack_chunk); 4631 if (((num_seg * (sizeof(struct sctp_gap_ack_block))) + sizeof(struct sctp_sack_chunk)) > sack_length) { 4632 4633 /* skip corrupt segments */ 4634 goto skip_segments; 4635 } 4636 if (num_seg > 0) { 4637 4638 /* 4639 * CMT: SFR algo (and HTNA) - this_sack_highest_newack has 4640 * to be greater than the cumack. Also reset saw_newack to 0 4641 * for all dests. 4642 */ 4643 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4644 net->saw_newack = 0; 4645 net->this_sack_highest_newack = last_tsn; 4646 } 4647 4648 /* 4649 * thisSackHighestGap will increase while handling NEW 4650 * segments this_sack_highest_newack will increase while 4651 * handling NEWLY ACKED chunks. this_sack_lowest_newack is 4652 * used for CMT DAC algo. saw_newack will also change. 4653 */ 4654 sctp_handle_segments(m, &offset, stcb, asoc, ch, last_tsn, 4655 &biggest_tsn_acked, &biggest_tsn_newly_acked, &this_sack_lowest_newack, 4656 num_seg, &ecn_seg_sums); 4657 4658 if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) { 4659 /* 4660 * validate the biggest_tsn_acked in the gap acks if 4661 * strict adherence is wanted. 4662 */ 4663 if ((biggest_tsn_acked == send_s) || 4664 (compare_with_wrap(biggest_tsn_acked, send_s, MAX_TSN))) { 4665 /* 4666 * peer is either confused or we are under 4667 * attack. We must abort. 4668 */ 4669 goto hopeless_peer; 4670 } 4671 } 4672 } 4673 skip_segments: 4674 /*******************************************/ 4675 /* cancel ALL T3-send timer if accum moved */ 4676 /*******************************************/ 4677 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off)) { 4678 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4679 if (net->new_pseudo_cumack) 4680 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 4681 stcb, net, 4682 SCTP_FROM_SCTP_INDATA + SCTP_LOC_27); 4683 4684 } 4685 } else { 4686 if (accum_moved) { 4687 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4688 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 4689 stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_28); 4690 } 4691 } 4692 } 4693 /********************************************/ 4694 /* drop the acked chunks from the sendqueue */ 4695 /********************************************/ 4696 asoc->last_acked_seq = cum_ack; 4697 4698 tp1 = TAILQ_FIRST(&asoc->sent_queue); 4699 if (tp1 == NULL) 4700 goto done_with_it; 4701 do { 4702 if (compare_with_wrap(tp1->rec.data.TSN_seq, cum_ack, 4703 MAX_TSN)) { 4704 break; 4705 } 4706 if (tp1->sent == SCTP_DATAGRAM_UNSENT) { 4707 /* no more sent on list */ 4708 printf("Warning, tp1->sent == %d and its now acked?\n", 4709 tp1->sent); 4710 } 4711 tp2 = TAILQ_NEXT(tp1, sctp_next); 4712 TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next); 4713 if (tp1->pr_sctp_on) { 4714 if (asoc->pr_sctp_cnt != 0) 4715 asoc->pr_sctp_cnt--; 4716 } 4717 if ((TAILQ_FIRST(&asoc->sent_queue) == NULL) && 4718 (asoc->total_flight > 0)) { 4719 #ifdef INVARIANTS 4720 panic("Warning flight size is postive and should be 0"); 4721 #else 4722 SCTP_PRINTF("Warning flight size incorrect should be 0 is %d\n", 4723 asoc->total_flight); 4724 #endif 4725 asoc->total_flight = 0; 4726 } 4727 if (tp1->data) { 4728 /* sa_ignore NO_NULL_CHK */ 4729 sctp_free_bufspace(stcb, asoc, tp1, 1); 4730 sctp_m_freem(tp1->data); 4731 if (PR_SCTP_BUF_ENABLED(tp1->flags)) { 4732 asoc->sent_queue_cnt_removeable--; 4733 } 4734 } 4735 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 4736 sctp_log_sack(asoc->last_acked_seq, 4737 cum_ack, 4738 tp1->rec.data.TSN_seq, 4739 0, 4740 0, 4741 SCTP_LOG_FREE_SENT); 4742 } 4743 tp1->data = NULL; 4744 asoc->sent_queue_cnt--; 4745 sctp_free_a_chunk(stcb, tp1); 4746 wake_him++; 4747 tp1 = tp2; 4748 } while (tp1 != NULL); 4749 4750 done_with_it: 4751 /* sa_ignore NO_NULL_CHK */ 4752 if ((wake_him) && (stcb->sctp_socket)) { 4753 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4754 struct socket *so; 4755 4756 #endif 4757 SOCKBUF_LOCK(&stcb->sctp_socket->so_snd); 4758 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) { 4759 sctp_wakeup_log(stcb, cum_ack, wake_him, SCTP_WAKESND_FROM_SACK); 4760 } 4761 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4762 so = SCTP_INP_SO(stcb->sctp_ep); 4763 atomic_add_int(&stcb->asoc.refcnt, 1); 4764 SCTP_TCB_UNLOCK(stcb); 4765 SCTP_SOCKET_LOCK(so, 1); 4766 SCTP_TCB_LOCK(stcb); 4767 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4768 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 4769 /* assoc was freed while we were unlocked */ 4770 SCTP_SOCKET_UNLOCK(so, 1); 4771 return; 4772 } 4773 #endif 4774 sctp_sowwakeup_locked(stcb->sctp_ep, stcb->sctp_socket); 4775 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4776 SCTP_SOCKET_UNLOCK(so, 1); 4777 #endif 4778 } else { 4779 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) { 4780 sctp_wakeup_log(stcb, cum_ack, wake_him, SCTP_NOWAKE_FROM_SACK); 4781 } 4782 } 4783 4784 if (asoc->fast_retran_loss_recovery && accum_moved) { 4785 if (compare_with_wrap(asoc->last_acked_seq, 4786 asoc->fast_recovery_tsn, MAX_TSN) || 4787 asoc->last_acked_seq == asoc->fast_recovery_tsn) { 4788 /* Setup so we will exit RFC2582 fast recovery */ 4789 will_exit_fast_recovery = 1; 4790 } 4791 } 4792 /* 4793 * Check for revoked fragments: 4794 * 4795 * if Previous sack - Had no frags then we can't have any revoked if 4796 * Previous sack - Had frag's then - If we now have frags aka 4797 * num_seg > 0 call sctp_check_for_revoked() to tell if peer revoked 4798 * some of them. else - The peer revoked all ACKED fragments, since 4799 * we had some before and now we have NONE. 4800 */ 4801 4802 if (num_seg) 4803 sctp_check_for_revoked(stcb, asoc, cum_ack, biggest_tsn_acked); 4804 else if (asoc->saw_sack_with_frags) { 4805 int cnt_revoked = 0; 4806 4807 tp1 = TAILQ_FIRST(&asoc->sent_queue); 4808 if (tp1 != NULL) { 4809 /* Peer revoked all dg's marked or acked */ 4810 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 4811 if ((tp1->sent > SCTP_DATAGRAM_RESEND) && 4812 (tp1->sent < SCTP_FORWARD_TSN_SKIP)) { 4813 tp1->sent = SCTP_DATAGRAM_SENT; 4814 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 4815 sctp_misc_ints(SCTP_FLIGHT_LOG_UP_REVOKE, 4816 tp1->whoTo->flight_size, 4817 tp1->book_size, 4818 (uintptr_t) tp1->whoTo, 4819 tp1->rec.data.TSN_seq); 4820 } 4821 sctp_flight_size_increase(tp1); 4822 sctp_total_flight_increase(stcb, tp1); 4823 tp1->rec.data.chunk_was_revoked = 1; 4824 /* 4825 * To ensure that this increase in 4826 * flightsize, which is artificial, 4827 * does not throttle the sender, we 4828 * also increase the cwnd 4829 * artificially. 4830 */ 4831 tp1->whoTo->cwnd += tp1->book_size; 4832 cnt_revoked++; 4833 } 4834 } 4835 if (cnt_revoked) { 4836 reneged_all = 1; 4837 } 4838 } 4839 asoc->saw_sack_with_frags = 0; 4840 } 4841 if (num_seg) 4842 asoc->saw_sack_with_frags = 1; 4843 else 4844 asoc->saw_sack_with_frags = 0; 4845 4846 /* JRS - Use the congestion control given in the CC module */ 4847 asoc->cc_functions.sctp_cwnd_update_after_sack(stcb, asoc, accum_moved, reneged_all, will_exit_fast_recovery); 4848 4849 if (TAILQ_EMPTY(&asoc->sent_queue)) { 4850 /* nothing left in-flight */ 4851 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4852 /* stop all timers */ 4853 if (SCTP_BASE_SYSCTL(sctp_early_fr)) { 4854 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) { 4855 SCTP_STAT_INCR(sctps_earlyfrstpidsck4); 4856 sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net, 4857 SCTP_FROM_SCTP_INDATA + SCTP_LOC_29); 4858 } 4859 } 4860 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 4861 stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_30); 4862 net->flight_size = 0; 4863 net->partial_bytes_acked = 0; 4864 } 4865 asoc->total_flight = 0; 4866 asoc->total_flight_count = 0; 4867 } 4868 /**********************************/ 4869 /* Now what about shutdown issues */ 4870 /**********************************/ 4871 if (TAILQ_EMPTY(&asoc->send_queue) && TAILQ_EMPTY(&asoc->sent_queue)) { 4872 /* nothing left on sendqueue.. consider done */ 4873 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) { 4874 sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK, 4875 asoc->peers_rwnd, 0, 0, a_rwnd); 4876 } 4877 asoc->peers_rwnd = a_rwnd; 4878 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4879 /* SWS sender side engages */ 4880 asoc->peers_rwnd = 0; 4881 } 4882 /* clean up */ 4883 if ((asoc->stream_queue_cnt == 1) && 4884 ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) || 4885 (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED)) && 4886 (asoc->locked_on_sending) 4887 ) { 4888 struct sctp_stream_queue_pending *sp; 4889 4890 /* 4891 * I may be in a state where we got all across.. but 4892 * cannot write more due to a shutdown... we abort 4893 * since the user did not indicate EOR in this case. 4894 */ 4895 sp = TAILQ_LAST(&((asoc->locked_on_sending)->outqueue), 4896 sctp_streamhead); 4897 if ((sp) && (sp->length == 0)) { 4898 asoc->locked_on_sending = NULL; 4899 if (sp->msg_is_complete) { 4900 asoc->stream_queue_cnt--; 4901 } else { 4902 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT; 4903 asoc->stream_queue_cnt--; 4904 } 4905 } 4906 } 4907 if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) && 4908 (asoc->stream_queue_cnt == 0)) { 4909 if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) { 4910 /* Need to abort here */ 4911 struct mbuf *oper; 4912 4913 abort_out_now: 4914 *abort_now = 1; 4915 /* XXX */ 4916 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)), 4917 0, M_DONTWAIT, 1, MT_DATA); 4918 if (oper) { 4919 struct sctp_paramhdr *ph; 4920 uint32_t *ippp; 4921 4922 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + 4923 sizeof(uint32_t); 4924 ph = mtod(oper, struct sctp_paramhdr *); 4925 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT); 4926 ph->param_length = htons(SCTP_BUF_LEN(oper)); 4927 ippp = (uint32_t *) (ph + 1); 4928 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_31); 4929 } 4930 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_31; 4931 sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_RESPONSE_TO_USER_REQ, oper, SCTP_SO_NOT_LOCKED); 4932 return; 4933 } else { 4934 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 4935 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 4936 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 4937 } 4938 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT); 4939 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 4940 sctp_stop_timers_for_shutdown(stcb); 4941 sctp_send_shutdown(stcb, 4942 stcb->asoc.primary_destination); 4943 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, 4944 stcb->sctp_ep, stcb, asoc->primary_destination); 4945 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 4946 stcb->sctp_ep, stcb, asoc->primary_destination); 4947 } 4948 return; 4949 } else if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) && 4950 (asoc->stream_queue_cnt == 0)) { 4951 if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) { 4952 goto abort_out_now; 4953 } 4954 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 4955 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 4956 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 4957 sctp_send_shutdown_ack(stcb, 4958 stcb->asoc.primary_destination); 4959 4960 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, 4961 stcb->sctp_ep, stcb, asoc->primary_destination); 4962 return; 4963 } 4964 } 4965 /* 4966 * Now here we are going to recycle net_ack for a different use... 4967 * HEADS UP. 4968 */ 4969 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4970 net->net_ack = 0; 4971 } 4972 4973 /* 4974 * CMT DAC algorithm: If SACK DAC flag was 0, then no extra marking 4975 * to be done. Setting this_sack_lowest_newack to the cum_ack will 4976 * automatically ensure that. 4977 */ 4978 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_use_dac) && (cmt_dac_flag == 0)) { 4979 this_sack_lowest_newack = cum_ack; 4980 } 4981 if (num_seg > 0) { 4982 sctp_strike_gap_ack_chunks(stcb, asoc, biggest_tsn_acked, 4983 biggest_tsn_newly_acked, this_sack_lowest_newack, accum_moved); 4984 } 4985 /*********************************************/ 4986 /* Here we perform PR-SCTP procedures */ 4987 /* (section 4.2) */ 4988 /*********************************************/ 4989 /* C1. update advancedPeerAckPoint */ 4990 if (compare_with_wrap(cum_ack, asoc->advanced_peer_ack_point, MAX_TSN)) { 4991 asoc->advanced_peer_ack_point = cum_ack; 4992 } 4993 /* C2. try to further move advancedPeerAckPoint ahead */ 4994 if ((asoc->peer_supports_prsctp) && (asoc->pr_sctp_cnt > 0)) { 4995 struct sctp_tmit_chunk *lchk; 4996 4997 lchk = sctp_try_advance_peer_ack_point(stcb, asoc); 4998 /* C3. See if we need to send a Fwd-TSN */ 4999 if (compare_with_wrap(asoc->advanced_peer_ack_point, cum_ack, 5000 MAX_TSN)) { 5001 /* 5002 * ISSUE with ECN, see FWD-TSN processing for notes 5003 * on issues that will occur when the ECN NONCE 5004 * stuff is put into SCTP for cross checking. 5005 */ 5006 send_forward_tsn(stcb, asoc); 5007 5008 /* 5009 * ECN Nonce: Disable Nonce Sum check when FWD TSN 5010 * is sent and store resync tsn 5011 */ 5012 asoc->nonce_sum_check = 0; 5013 asoc->nonce_resync_tsn = asoc->advanced_peer_ack_point; 5014 if (lchk) { 5015 /* Assure a timer is up */ 5016 sctp_timer_start(SCTP_TIMER_TYPE_SEND, 5017 stcb->sctp_ep, stcb, lchk->whoTo); 5018 } 5019 } 5020 } 5021 /* JRS - Use the congestion control given in the CC module */ 5022 asoc->cc_functions.sctp_cwnd_update_after_fr(stcb, asoc); 5023 5024 /****************************************************************** 5025 * Here we do the stuff with ECN Nonce checking. 5026 * We basically check to see if the nonce sum flag was incorrect 5027 * or if resynchronization needs to be done. Also if we catch a 5028 * misbehaving receiver we give him the kick. 5029 ******************************************************************/ 5030 5031 if (asoc->ecn_nonce_allowed) { 5032 if (asoc->nonce_sum_check) { 5033 if (nonce_sum_flag != ((asoc->nonce_sum_expect_base + ecn_seg_sums) & SCTP_SACK_NONCE_SUM)) { 5034 if (asoc->nonce_wait_for_ecne == 0) { 5035 struct sctp_tmit_chunk *lchk; 5036 5037 lchk = TAILQ_FIRST(&asoc->send_queue); 5038 asoc->nonce_wait_for_ecne = 1; 5039 if (lchk) { 5040 asoc->nonce_wait_tsn = lchk->rec.data.TSN_seq; 5041 } else { 5042 asoc->nonce_wait_tsn = asoc->sending_seq; 5043 } 5044 } else { 5045 if (compare_with_wrap(asoc->last_acked_seq, asoc->nonce_wait_tsn, MAX_TSN) || 5046 (asoc->last_acked_seq == asoc->nonce_wait_tsn)) { 5047 /* 5048 * Misbehaving peer. We need 5049 * to react to this guy 5050 */ 5051 asoc->ecn_allowed = 0; 5052 asoc->ecn_nonce_allowed = 0; 5053 } 5054 } 5055 } 5056 } else { 5057 /* See if Resynchronization Possible */ 5058 if (compare_with_wrap(asoc->last_acked_seq, asoc->nonce_resync_tsn, MAX_TSN)) { 5059 asoc->nonce_sum_check = 1; 5060 /* 5061 * now we must calculate what the base is. 5062 * We do this based on two things, we know 5063 * the total's for all the segments 5064 * gap-acked in the SACK, its stored in 5065 * ecn_seg_sums. We also know the SACK's 5066 * nonce sum, its in nonce_sum_flag. So we 5067 * can build a truth table to back-calculate 5068 * the new value of 5069 * asoc->nonce_sum_expect_base: 5070 * 5071 * SACK-flag-Value Seg-Sums Base 0 0 0 5072 * 1 0 1 0 1 1 1 5073 * 1 0 5074 */ 5075 asoc->nonce_sum_expect_base = (ecn_seg_sums ^ nonce_sum_flag) & SCTP_SACK_NONCE_SUM; 5076 } 5077 } 5078 } 5079 /* Now are we exiting loss recovery ? */ 5080 if (will_exit_fast_recovery) { 5081 /* Ok, we must exit fast recovery */ 5082 asoc->fast_retran_loss_recovery = 0; 5083 } 5084 if ((asoc->sat_t3_loss_recovery) && 5085 ((compare_with_wrap(asoc->last_acked_seq, asoc->sat_t3_recovery_tsn, 5086 MAX_TSN) || 5087 (asoc->last_acked_seq == asoc->sat_t3_recovery_tsn)))) { 5088 /* end satellite t3 loss recovery */ 5089 asoc->sat_t3_loss_recovery = 0; 5090 } 5091 /* 5092 * CMT Fast recovery 5093 */ 5094 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 5095 if (net->will_exit_fast_recovery) { 5096 /* Ok, we must exit fast recovery */ 5097 net->fast_retran_loss_recovery = 0; 5098 } 5099 } 5100 5101 /* Adjust and set the new rwnd value */ 5102 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) { 5103 sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK, 5104 asoc->peers_rwnd, asoc->total_flight, (asoc->sent_queue_cnt * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)), a_rwnd); 5105 } 5106 asoc->peers_rwnd = sctp_sbspace_sub(a_rwnd, 5107 (uint32_t) (asoc->total_flight + (asoc->sent_queue_cnt * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)))); 5108 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 5109 /* SWS sender side engages */ 5110 asoc->peers_rwnd = 0; 5111 } 5112 if (asoc->peers_rwnd > old_rwnd) { 5113 win_probe_recovery = 1; 5114 } 5115 /* 5116 * Now we must setup so we have a timer up for anyone with 5117 * outstanding data. 5118 */ 5119 done_once = 0; 5120 again: 5121 j = 0; 5122 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 5123 if (win_probe_recovery && (net->window_probe)) { 5124 net->window_probe = 0; 5125 win_probe_recovered = 1; 5126 /*- 5127 * Find first chunk that was used with 5128 * window probe and clear the event. Put 5129 * it back into the send queue as if has 5130 * not been sent. 5131 */ 5132 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 5133 if (tp1->window_probe) { 5134 sctp_window_probe_recovery(stcb, asoc, net, tp1); 5135 break; 5136 } 5137 } 5138 } 5139 if (net->flight_size) { 5140 j++; 5141 sctp_timer_start(SCTP_TIMER_TYPE_SEND, 5142 stcb->sctp_ep, stcb, net); 5143 } else { 5144 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { 5145 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 5146 stcb, net, 5147 SCTP_FROM_SCTP_INDATA + SCTP_LOC_22); 5148 } 5149 if (SCTP_BASE_SYSCTL(sctp_early_fr)) { 5150 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) { 5151 SCTP_STAT_INCR(sctps_earlyfrstpidsck4); 5152 sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net, 5153 SCTP_FROM_SCTP_INDATA + SCTP_LOC_23); 5154 } 5155 } 5156 } 5157 } 5158 if ((j == 0) && 5159 (!TAILQ_EMPTY(&asoc->sent_queue)) && 5160 (asoc->sent_queue_retran_cnt == 0) && 5161 (win_probe_recovered == 0) && 5162 (done_once == 0)) { 5163 /* huh, this should not happen */ 5164 sctp_fs_audit(asoc); 5165 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 5166 net->flight_size = 0; 5167 } 5168 asoc->total_flight = 0; 5169 asoc->total_flight_count = 0; 5170 asoc->sent_queue_retran_cnt = 0; 5171 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 5172 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 5173 sctp_flight_size_increase(tp1); 5174 sctp_total_flight_increase(stcb, tp1); 5175 } else if (tp1->sent == SCTP_DATAGRAM_RESEND) { 5176 asoc->sent_queue_retran_cnt++; 5177 } 5178 } 5179 done_once = 1; 5180 goto again; 5181 } 5182 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_RWND_LOGGING_ENABLE) { 5183 sctp_misc_ints(SCTP_SACK_RWND_UPDATE, 5184 a_rwnd, 5185 stcb->asoc.peers_rwnd, 5186 stcb->asoc.total_flight, 5187 stcb->asoc.total_output_queue_size); 5188 } 5189 } 5190 5191 void 5192 sctp_update_acked(struct sctp_tcb *stcb, struct sctp_shutdown_chunk *cp, 5193 struct sctp_nets *netp, int *abort_flag) 5194 { 5195 /* Copy cum-ack */ 5196 uint32_t cum_ack, a_rwnd; 5197 5198 cum_ack = ntohl(cp->cumulative_tsn_ack); 5199 /* Arrange so a_rwnd does NOT change */ 5200 a_rwnd = stcb->asoc.peers_rwnd + stcb->asoc.total_flight; 5201 5202 /* Now call the express sack handling */ 5203 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 0, abort_flag); 5204 } 5205 5206 static void 5207 sctp_kick_prsctp_reorder_queue(struct sctp_tcb *stcb, 5208 struct sctp_stream_in *strmin) 5209 { 5210 struct sctp_queued_to_read *ctl, *nctl; 5211 struct sctp_association *asoc; 5212 int tt; 5213 5214 asoc = &stcb->asoc; 5215 tt = strmin->last_sequence_delivered; 5216 /* 5217 * First deliver anything prior to and including the stream no that 5218 * came in 5219 */ 5220 ctl = TAILQ_FIRST(&strmin->inqueue); 5221 while (ctl) { 5222 nctl = TAILQ_NEXT(ctl, next); 5223 if (compare_with_wrap(tt, ctl->sinfo_ssn, MAX_SEQ) || 5224 (tt == ctl->sinfo_ssn)) { 5225 /* this is deliverable now */ 5226 TAILQ_REMOVE(&strmin->inqueue, ctl, next); 5227 /* subtract pending on streams */ 5228 asoc->size_on_all_streams -= ctl->length; 5229 sctp_ucount_decr(asoc->cnt_on_all_streams); 5230 /* deliver it to at least the delivery-q */ 5231 if (stcb->sctp_socket) { 5232 sctp_add_to_readq(stcb->sctp_ep, stcb, 5233 ctl, 5234 &stcb->sctp_socket->so_rcv, 1, SCTP_SO_NOT_LOCKED); 5235 } 5236 } else { 5237 /* no more delivery now. */ 5238 break; 5239 } 5240 ctl = nctl; 5241 } 5242 /* 5243 * now we must deliver things in queue the normal way if any are 5244 * now ready. 5245 */ 5246 tt = strmin->last_sequence_delivered + 1; 5247 ctl = TAILQ_FIRST(&strmin->inqueue); 5248 while (ctl) { 5249 nctl = TAILQ_NEXT(ctl, next); 5250 if (tt == ctl->sinfo_ssn) { 5251 /* this is deliverable now */ 5252 TAILQ_REMOVE(&strmin->inqueue, ctl, next); 5253 /* subtract pending on streams */ 5254 asoc->size_on_all_streams -= ctl->length; 5255 sctp_ucount_decr(asoc->cnt_on_all_streams); 5256 /* deliver it to at least the delivery-q */ 5257 strmin->last_sequence_delivered = ctl->sinfo_ssn; 5258 if (stcb->sctp_socket) { 5259 sctp_add_to_readq(stcb->sctp_ep, stcb, 5260 ctl, 5261 &stcb->sctp_socket->so_rcv, 1, SCTP_SO_NOT_LOCKED); 5262 } 5263 tt = strmin->last_sequence_delivered + 1; 5264 } else { 5265 break; 5266 } 5267 ctl = nctl; 5268 } 5269 } 5270 5271 void 5272 sctp_handle_forward_tsn(struct sctp_tcb *stcb, 5273 struct sctp_forward_tsn_chunk *fwd, int *abort_flag, struct mbuf *m, int offset) 5274 { 5275 /* 5276 * ISSUES that MUST be fixed for ECN! When we are the sender of the 5277 * forward TSN, when the SACK comes back that acknowledges the 5278 * FWD-TSN we must reset the NONCE sum to match correctly. This will 5279 * get quite tricky since we may have sent more data interveneing 5280 * and must carefully account for what the SACK says on the nonce 5281 * and any gaps that are reported. This work will NOT be done here, 5282 * but I note it here since it is really related to PR-SCTP and 5283 * FWD-TSN's 5284 */ 5285 5286 /* The pr-sctp fwd tsn */ 5287 /* 5288 * here we will perform all the data receiver side steps for 5289 * processing FwdTSN, as required in by pr-sctp draft: 5290 * 5291 * Assume we get FwdTSN(x): 5292 * 5293 * 1) update local cumTSN to x 2) try to further advance cumTSN to x + 5294 * others we have 3) examine and update re-ordering queue on 5295 * pr-in-streams 4) clean up re-assembly queue 5) Send a sack to 5296 * report where we are. 5297 */ 5298 struct sctp_association *asoc; 5299 uint32_t new_cum_tsn, gap; 5300 unsigned int i, cnt_gone, fwd_sz, cumack_set_flag, m_size; 5301 struct sctp_stream_in *strm; 5302 struct sctp_tmit_chunk *chk, *at; 5303 5304 cumack_set_flag = 0; 5305 asoc = &stcb->asoc; 5306 cnt_gone = 0; 5307 if ((fwd_sz = ntohs(fwd->ch.chunk_length)) < sizeof(struct sctp_forward_tsn_chunk)) { 5308 SCTPDBG(SCTP_DEBUG_INDATA1, 5309 "Bad size too small/big fwd-tsn\n"); 5310 return; 5311 } 5312 m_size = (stcb->asoc.mapping_array_size << 3); 5313 /*************************************************************/ 5314 /* 1. Here we update local cumTSN and shift the bitmap array */ 5315 /*************************************************************/ 5316 new_cum_tsn = ntohl(fwd->new_cumulative_tsn); 5317 5318 if (compare_with_wrap(asoc->cumulative_tsn, new_cum_tsn, MAX_TSN) || 5319 asoc->cumulative_tsn == new_cum_tsn) { 5320 /* Already got there ... */ 5321 return; 5322 } 5323 if (compare_with_wrap(new_cum_tsn, asoc->highest_tsn_inside_map, 5324 MAX_TSN)) { 5325 asoc->highest_tsn_inside_map = new_cum_tsn; 5326 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 5327 sctp_log_map(0, 0, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 5328 } 5329 } 5330 /* 5331 * now we know the new TSN is more advanced, let's find the actual 5332 * gap 5333 */ 5334 if ((compare_with_wrap(new_cum_tsn, asoc->mapping_array_base_tsn, 5335 MAX_TSN)) || 5336 (new_cum_tsn == asoc->mapping_array_base_tsn)) { 5337 gap = new_cum_tsn - asoc->mapping_array_base_tsn; 5338 } else { 5339 /* try to prevent underflow here */ 5340 gap = new_cum_tsn + (MAX_TSN - asoc->mapping_array_base_tsn) + 1; 5341 } 5342 5343 if (gap >= m_size) { 5344 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 5345 sctp_log_map(0, 0, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 5346 } 5347 if ((long)gap > sctp_sbspace(&stcb->asoc, &stcb->sctp_socket->so_rcv)) { 5348 struct mbuf *oper; 5349 5350 /* 5351 * out of range (of single byte chunks in the rwnd I 5352 * give out). This must be an attacker. 5353 */ 5354 *abort_flag = 1; 5355 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 5356 0, M_DONTWAIT, 1, MT_DATA); 5357 if (oper) { 5358 struct sctp_paramhdr *ph; 5359 uint32_t *ippp; 5360 5361 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + 5362 (sizeof(uint32_t) * 3); 5363 ph = mtod(oper, struct sctp_paramhdr *); 5364 ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 5365 ph->param_length = htons(SCTP_BUF_LEN(oper)); 5366 ippp = (uint32_t *) (ph + 1); 5367 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_33); 5368 ippp++; 5369 *ippp = asoc->highest_tsn_inside_map; 5370 ippp++; 5371 *ippp = new_cum_tsn; 5372 } 5373 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_33; 5374 sctp_abort_an_association(stcb->sctp_ep, stcb, 5375 SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); 5376 return; 5377 } 5378 SCTP_STAT_INCR(sctps_fwdtsn_map_over); 5379 slide_out: 5380 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 5381 cumack_set_flag = 1; 5382 asoc->mapping_array_base_tsn = new_cum_tsn + 1; 5383 asoc->cumulative_tsn = asoc->highest_tsn_inside_map = new_cum_tsn; 5384 5385 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 5386 sctp_log_map(0, 3, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 5387 } 5388 asoc->last_echo_tsn = asoc->highest_tsn_inside_map; 5389 } else { 5390 SCTP_TCB_LOCK_ASSERT(stcb); 5391 if ((compare_with_wrap(((uint32_t) asoc->cumulative_tsn + gap), asoc->highest_tsn_inside_map, MAX_TSN)) || 5392 (((uint32_t) asoc->cumulative_tsn + gap) == asoc->highest_tsn_inside_map)) { 5393 goto slide_out; 5394 } else { 5395 for (i = 0; i <= gap; i++) { 5396 SCTP_SET_TSN_PRESENT(asoc->mapping_array, i); 5397 } 5398 } 5399 /* 5400 * Now after marking all, slide thing forward but no sack 5401 * please. 5402 */ 5403 sctp_sack_check(stcb, 0, 0, abort_flag); 5404 if (*abort_flag) 5405 return; 5406 } 5407 5408 /*************************************************************/ 5409 /* 2. Clear up re-assembly queue */ 5410 /*************************************************************/ 5411 /* 5412 * First service it if pd-api is up, just in case we can progress it 5413 * forward 5414 */ 5415 if (asoc->fragmented_delivery_inprogress) { 5416 sctp_service_reassembly(stcb, asoc); 5417 } 5418 if (!TAILQ_EMPTY(&asoc->reasmqueue)) { 5419 /* For each one on here see if we need to toss it */ 5420 /* 5421 * For now large messages held on the reasmqueue that are 5422 * complete will be tossed too. We could in theory do more 5423 * work to spin through and stop after dumping one msg aka 5424 * seeing the start of a new msg at the head, and call the 5425 * delivery function... to see if it can be delivered... But 5426 * for now we just dump everything on the queue. 5427 */ 5428 chk = TAILQ_FIRST(&asoc->reasmqueue); 5429 while (chk) { 5430 at = TAILQ_NEXT(chk, sctp_next); 5431 if (compare_with_wrap(asoc->cumulative_tsn, 5432 chk->rec.data.TSN_seq, MAX_TSN) || 5433 asoc->cumulative_tsn == chk->rec.data.TSN_seq) { 5434 /* It needs to be tossed */ 5435 TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next); 5436 if (compare_with_wrap(chk->rec.data.TSN_seq, 5437 asoc->tsn_last_delivered, MAX_TSN)) { 5438 asoc->tsn_last_delivered = 5439 chk->rec.data.TSN_seq; 5440 asoc->str_of_pdapi = 5441 chk->rec.data.stream_number; 5442 asoc->ssn_of_pdapi = 5443 chk->rec.data.stream_seq; 5444 asoc->fragment_flags = 5445 chk->rec.data.rcv_flags; 5446 } 5447 asoc->size_on_reasm_queue -= chk->send_size; 5448 sctp_ucount_decr(asoc->cnt_on_reasm_queue); 5449 cnt_gone++; 5450 5451 /* Clear up any stream problem */ 5452 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) != 5453 SCTP_DATA_UNORDERED && 5454 (compare_with_wrap(chk->rec.data.stream_seq, 5455 asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered, 5456 MAX_SEQ))) { 5457 /* 5458 * We must dump forward this streams 5459 * sequence number if the chunk is 5460 * not unordered that is being 5461 * skipped. There is a chance that 5462 * if the peer does not include the 5463 * last fragment in its FWD-TSN we 5464 * WILL have a problem here since 5465 * you would have a partial chunk in 5466 * queue that may not be 5467 * deliverable. Also if a Partial 5468 * delivery API as started the user 5469 * may get a partial chunk. The next 5470 * read returning a new chunk... 5471 * really ugly but I see no way 5472 * around it! Maybe a notify?? 5473 */ 5474 asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered = 5475 chk->rec.data.stream_seq; 5476 } 5477 if (chk->data) { 5478 sctp_m_freem(chk->data); 5479 chk->data = NULL; 5480 } 5481 sctp_free_a_chunk(stcb, chk); 5482 } else { 5483 /* 5484 * Ok we have gone beyond the end of the 5485 * fwd-tsn's mark. Some checks... 5486 */ 5487 if ((asoc->fragmented_delivery_inprogress) && 5488 (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG)) { 5489 uint32_t str_seq; 5490 5491 /* 5492 * Special case PD-API is up and 5493 * what we fwd-tsn' over includes 5494 * one that had the LAST_FRAG. We no 5495 * longer need to do the PD-API. 5496 */ 5497 asoc->fragmented_delivery_inprogress = 0; 5498 5499 str_seq = (asoc->str_of_pdapi << 16) | asoc->ssn_of_pdapi; 5500 sctp_ulp_notify(SCTP_NOTIFY_PARTIAL_DELVIERY_INDICATION, 5501 stcb, SCTP_PARTIAL_DELIVERY_ABORTED, (void *)&str_seq, SCTP_SO_NOT_LOCKED); 5502 5503 } 5504 break; 5505 } 5506 chk = at; 5507 } 5508 } 5509 if (asoc->fragmented_delivery_inprogress) { 5510 /* 5511 * Ok we removed cnt_gone chunks in the PD-API queue that 5512 * were being delivered. So now we must turn off the flag. 5513 */ 5514 uint32_t str_seq; 5515 5516 str_seq = (asoc->str_of_pdapi << 16) | asoc->ssn_of_pdapi; 5517 sctp_ulp_notify(SCTP_NOTIFY_PARTIAL_DELVIERY_INDICATION, 5518 stcb, SCTP_PARTIAL_DELIVERY_ABORTED, (void *)&str_seq, SCTP_SO_NOT_LOCKED); 5519 asoc->fragmented_delivery_inprogress = 0; 5520 } 5521 /*************************************************************/ 5522 /* 3. Update the PR-stream re-ordering queues */ 5523 /*************************************************************/ 5524 fwd_sz -= sizeof(*fwd); 5525 if (m && fwd_sz) { 5526 /* New method. */ 5527 unsigned int num_str; 5528 struct sctp_strseq *stseq, strseqbuf; 5529 5530 offset += sizeof(*fwd); 5531 5532 num_str = fwd_sz / sizeof(struct sctp_strseq); 5533 for (i = 0; i < num_str; i++) { 5534 uint16_t st; 5535 5536 stseq = (struct sctp_strseq *)sctp_m_getptr(m, offset, 5537 sizeof(struct sctp_strseq), 5538 (uint8_t *) & strseqbuf); 5539 offset += sizeof(struct sctp_strseq); 5540 if (stseq == NULL) { 5541 break; 5542 } 5543 /* Convert */ 5544 st = ntohs(stseq->stream); 5545 stseq->stream = st; 5546 st = ntohs(stseq->sequence); 5547 stseq->sequence = st; 5548 /* now process */ 5549 if (stseq->stream >= asoc->streamincnt) { 5550 /* screwed up streams, stop! */ 5551 break; 5552 } 5553 strm = &asoc->strmin[stseq->stream]; 5554 if (compare_with_wrap(stseq->sequence, 5555 strm->last_sequence_delivered, MAX_SEQ)) { 5556 /* Update the sequence number */ 5557 strm->last_sequence_delivered = 5558 stseq->sequence; 5559 } 5560 /* now kick the stream the new way */ 5561 /* sa_ignore NO_NULL_CHK */ 5562 sctp_kick_prsctp_reorder_queue(stcb, strm); 5563 } 5564 } 5565 if (TAILQ_FIRST(&asoc->reasmqueue)) { 5566 /* now lets kick out and check for more fragmented delivery */ 5567 /* sa_ignore NO_NULL_CHK */ 5568 sctp_deliver_reasm_check(stcb, &stcb->asoc); 5569 } 5570 } 5571