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 #define SCTP_CALC_TSN_TO_GAP(gap, tsn, mapping_tsn) do { \ 49 if ((compare_with_wrap(tsn, mapping_tsn, MAX_TSN)) || \ 50 (tsn == mapping_tsn)) { \ 51 gap = tsn - mapping_tsn; \ 52 } else { \ 53 gap = (MAX_TSN - mapping_tsn) + tsn + 1; \ 54 } \ 55 } while(0) 56 57 #define SCTP_REVERSE_OUT_TSN_PRES(nr_gap, tsn, asoc) do { \ 58 if (asoc->mapping_array_base_tsn == asoc->nr_mapping_array_base_tsn) { \ 59 SCTP_UNSET_TSN_PRESENT(asoc->mapping_array, nr_gap); \ 60 } else {\ 61 int lgap; \ 62 SCTP_CALC_TSN_TO_GAP(lgap, tsn, asoc->mapping_array_base_tsn); \ 63 SCTP_UNSET_TSN_PRESENT(asoc->mapping_array, lgap); \ 64 } \ 65 } while(0) 66 67 /* 68 * NOTES: On the outbound side of things I need to check the sack timer to 69 * see if I should generate a sack into the chunk queue (if I have data to 70 * send that is and will be sending it .. for bundling. 71 * 72 * The callback in sctp_usrreq.c will get called when the socket is read from. 73 * This will cause sctp_service_queues() to get called on the top entry in 74 * the list. 75 */ 76 77 void 78 sctp_set_rwnd(struct sctp_tcb *stcb, struct sctp_association *asoc) 79 { 80 asoc->my_rwnd = sctp_calc_rwnd(stcb, asoc); 81 } 82 83 /* Calculate what the rwnd would be */ 84 uint32_t 85 sctp_calc_rwnd(struct sctp_tcb *stcb, struct sctp_association *asoc) 86 { 87 uint32_t calc = 0; 88 89 /* 90 * This is really set wrong with respect to a 1-2-m socket. Since 91 * the sb_cc is the count that everyone as put up. When we re-write 92 * sctp_soreceive then we will fix this so that ONLY this 93 * associations data is taken into account. 94 */ 95 if (stcb->sctp_socket == NULL) 96 return (calc); 97 98 if (stcb->asoc.sb_cc == 0 && 99 asoc->size_on_reasm_queue == 0 && 100 asoc->size_on_all_streams == 0) { 101 /* Full rwnd granted */ 102 calc = max(SCTP_SB_LIMIT_RCV(stcb->sctp_socket), SCTP_MINIMAL_RWND); 103 return (calc); 104 } 105 /* get actual space */ 106 calc = (uint32_t) sctp_sbspace(&stcb->asoc, &stcb->sctp_socket->so_rcv); 107 108 /* 109 * take out what has NOT been put on socket queue and we yet hold 110 * for putting up. 111 */ 112 calc = sctp_sbspace_sub(calc, (uint32_t) asoc->size_on_reasm_queue); 113 calc = sctp_sbspace_sub(calc, (uint32_t) asoc->size_on_all_streams); 114 115 if (calc == 0) { 116 /* out of space */ 117 return (calc); 118 } 119 /* what is the overhead of all these rwnd's */ 120 calc = sctp_sbspace_sub(calc, stcb->asoc.my_rwnd_control_len); 121 /* 122 * If the window gets too small due to ctrl-stuff, reduce it to 1, 123 * even it is 0. SWS engaged 124 */ 125 if (calc < stcb->asoc.my_rwnd_control_len) { 126 calc = 1; 127 } 128 return (calc); 129 } 130 131 132 133 /* 134 * Build out our readq entry based on the incoming packet. 135 */ 136 struct sctp_queued_to_read * 137 sctp_build_readq_entry(struct sctp_tcb *stcb, 138 struct sctp_nets *net, 139 uint32_t tsn, uint32_t ppid, 140 uint32_t context, uint16_t stream_no, 141 uint16_t stream_seq, uint8_t flags, 142 struct mbuf *dm) 143 { 144 struct sctp_queued_to_read *read_queue_e = NULL; 145 146 sctp_alloc_a_readq(stcb, read_queue_e); 147 if (read_queue_e == NULL) { 148 goto failed_build; 149 } 150 read_queue_e->sinfo_stream = stream_no; 151 read_queue_e->sinfo_ssn = stream_seq; 152 read_queue_e->sinfo_flags = (flags << 8); 153 read_queue_e->sinfo_ppid = ppid; 154 read_queue_e->sinfo_context = stcb->asoc.context; 155 read_queue_e->sinfo_timetolive = 0; 156 read_queue_e->sinfo_tsn = tsn; 157 read_queue_e->sinfo_cumtsn = tsn; 158 read_queue_e->sinfo_assoc_id = sctp_get_associd(stcb); 159 read_queue_e->whoFrom = net; 160 read_queue_e->length = 0; 161 atomic_add_int(&net->ref_count, 1); 162 read_queue_e->data = dm; 163 read_queue_e->spec_flags = 0; 164 read_queue_e->tail_mbuf = NULL; 165 read_queue_e->aux_data = NULL; 166 read_queue_e->stcb = stcb; 167 read_queue_e->port_from = stcb->rport; 168 read_queue_e->do_not_ref_stcb = 0; 169 read_queue_e->end_added = 0; 170 read_queue_e->some_taken = 0; 171 read_queue_e->pdapi_aborted = 0; 172 failed_build: 173 return (read_queue_e); 174 } 175 176 177 /* 178 * Build out our readq entry based on the incoming packet. 179 */ 180 static struct sctp_queued_to_read * 181 sctp_build_readq_entry_chk(struct sctp_tcb *stcb, 182 struct sctp_tmit_chunk *chk) 183 { 184 struct sctp_queued_to_read *read_queue_e = NULL; 185 186 sctp_alloc_a_readq(stcb, read_queue_e); 187 if (read_queue_e == NULL) { 188 goto failed_build; 189 } 190 read_queue_e->sinfo_stream = chk->rec.data.stream_number; 191 read_queue_e->sinfo_ssn = chk->rec.data.stream_seq; 192 read_queue_e->sinfo_flags = (chk->rec.data.rcv_flags << 8); 193 read_queue_e->sinfo_ppid = chk->rec.data.payloadtype; 194 read_queue_e->sinfo_context = stcb->asoc.context; 195 read_queue_e->sinfo_timetolive = 0; 196 read_queue_e->sinfo_tsn = chk->rec.data.TSN_seq; 197 read_queue_e->sinfo_cumtsn = chk->rec.data.TSN_seq; 198 read_queue_e->sinfo_assoc_id = sctp_get_associd(stcb); 199 read_queue_e->whoFrom = chk->whoTo; 200 read_queue_e->aux_data = NULL; 201 read_queue_e->length = 0; 202 atomic_add_int(&chk->whoTo->ref_count, 1); 203 read_queue_e->data = chk->data; 204 read_queue_e->tail_mbuf = NULL; 205 read_queue_e->stcb = stcb; 206 read_queue_e->port_from = stcb->rport; 207 read_queue_e->spec_flags = 0; 208 read_queue_e->do_not_ref_stcb = 0; 209 read_queue_e->end_added = 0; 210 read_queue_e->some_taken = 0; 211 read_queue_e->pdapi_aborted = 0; 212 failed_build: 213 return (read_queue_e); 214 } 215 216 217 struct mbuf * 218 sctp_build_ctl_nchunk(struct sctp_inpcb *inp, 219 struct sctp_sndrcvinfo *sinfo) 220 { 221 struct sctp_sndrcvinfo *outinfo; 222 struct cmsghdr *cmh; 223 struct mbuf *ret; 224 int len; 225 int use_extended = 0; 226 227 if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_RECVDATAIOEVNT)) { 228 /* user does not want the sndrcv ctl */ 229 return (NULL); 230 } 231 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXT_RCVINFO)) { 232 use_extended = 1; 233 len = CMSG_LEN(sizeof(struct sctp_extrcvinfo)); 234 } else { 235 len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo)); 236 } 237 238 239 ret = sctp_get_mbuf_for_msg(len, 240 0, M_DONTWAIT, 1, MT_DATA); 241 242 if (ret == NULL) { 243 /* No space */ 244 return (ret); 245 } 246 /* We need a CMSG header followed by the struct */ 247 cmh = mtod(ret, struct cmsghdr *); 248 outinfo = (struct sctp_sndrcvinfo *)CMSG_DATA(cmh); 249 cmh->cmsg_level = IPPROTO_SCTP; 250 if (use_extended) { 251 cmh->cmsg_type = SCTP_EXTRCV; 252 cmh->cmsg_len = len; 253 memcpy(outinfo, sinfo, len); 254 } else { 255 cmh->cmsg_type = SCTP_SNDRCV; 256 cmh->cmsg_len = len; 257 *outinfo = *sinfo; 258 } 259 SCTP_BUF_LEN(ret) = cmh->cmsg_len; 260 return (ret); 261 } 262 263 264 char * 265 sctp_build_ctl_cchunk(struct sctp_inpcb *inp, 266 int *control_len, 267 struct sctp_sndrcvinfo *sinfo) 268 { 269 struct sctp_sndrcvinfo *outinfo; 270 struct cmsghdr *cmh; 271 char *buf; 272 int len; 273 int use_extended = 0; 274 275 if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_RECVDATAIOEVNT)) { 276 /* user does not want the sndrcv ctl */ 277 return (NULL); 278 } 279 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXT_RCVINFO)) { 280 use_extended = 1; 281 len = CMSG_LEN(sizeof(struct sctp_extrcvinfo)); 282 } else { 283 len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo)); 284 } 285 SCTP_MALLOC(buf, char *, len, SCTP_M_CMSG); 286 if (buf == NULL) { 287 /* No space */ 288 return (buf); 289 } 290 /* We need a CMSG header followed by the struct */ 291 cmh = (struct cmsghdr *)buf; 292 outinfo = (struct sctp_sndrcvinfo *)CMSG_DATA(cmh); 293 cmh->cmsg_level = IPPROTO_SCTP; 294 if (use_extended) { 295 cmh->cmsg_type = SCTP_EXTRCV; 296 cmh->cmsg_len = len; 297 memcpy(outinfo, sinfo, len); 298 } else { 299 cmh->cmsg_type = SCTP_SNDRCV; 300 cmh->cmsg_len = len; 301 *outinfo = *sinfo; 302 } 303 *control_len = len; 304 return (buf); 305 } 306 307 308 /* 309 * We are delivering currently from the reassembly queue. We must continue to 310 * deliver until we either: 1) run out of space. 2) run out of sequential 311 * TSN's 3) hit the SCTP_DATA_LAST_FRAG flag. 312 */ 313 static void 314 sctp_service_reassembly(struct sctp_tcb *stcb, struct sctp_association *asoc) 315 { 316 struct sctp_tmit_chunk *chk; 317 uint16_t nxt_todel; 318 uint16_t stream_no; 319 int end = 0; 320 int cntDel; 321 322 /* EY if any out-of-order delivered, then tag it nr on nr_map */ 323 uint32_t nr_tsn, nr_gap; 324 325 struct sctp_queued_to_read *control, *ctl, *ctlat; 326 327 if (stcb == NULL) 328 return; 329 330 cntDel = stream_no = 0; 331 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 332 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) || 333 (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET)) { 334 /* socket above is long gone or going.. */ 335 abandon: 336 asoc->fragmented_delivery_inprogress = 0; 337 chk = TAILQ_FIRST(&asoc->reasmqueue); 338 while (chk) { 339 TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next); 340 asoc->size_on_reasm_queue -= chk->send_size; 341 sctp_ucount_decr(asoc->cnt_on_reasm_queue); 342 /* 343 * Lose the data pointer, since its in the socket 344 * buffer 345 */ 346 if (chk->data) { 347 sctp_m_freem(chk->data); 348 chk->data = NULL; 349 } 350 /* Now free the address and data */ 351 sctp_free_a_chunk(stcb, chk); 352 /* sa_ignore FREED_MEMORY */ 353 chk = TAILQ_FIRST(&asoc->reasmqueue); 354 } 355 return; 356 } 357 SCTP_TCB_LOCK_ASSERT(stcb); 358 do { 359 chk = TAILQ_FIRST(&asoc->reasmqueue); 360 if (chk == NULL) { 361 return; 362 } 363 if (chk->rec.data.TSN_seq != (asoc->tsn_last_delivered + 1)) { 364 /* Can't deliver more :< */ 365 return; 366 } 367 stream_no = chk->rec.data.stream_number; 368 nxt_todel = asoc->strmin[stream_no].last_sequence_delivered + 1; 369 if (nxt_todel != chk->rec.data.stream_seq && 370 (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) { 371 /* 372 * Not the next sequence to deliver in its stream OR 373 * unordered 374 */ 375 return; 376 } 377 if (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) { 378 379 control = sctp_build_readq_entry_chk(stcb, chk); 380 if (control == NULL) { 381 /* out of memory? */ 382 return; 383 } 384 /* save it off for our future deliveries */ 385 stcb->asoc.control_pdapi = control; 386 if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) 387 end = 1; 388 else 389 end = 0; 390 sctp_add_to_readq(stcb->sctp_ep, 391 stcb, control, &stcb->sctp_socket->so_rcv, end, 392 SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED); 393 cntDel++; 394 } else { 395 if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) 396 end = 1; 397 else 398 end = 0; 399 if (sctp_append_to_readq(stcb->sctp_ep, stcb, 400 stcb->asoc.control_pdapi, 401 chk->data, end, chk->rec.data.TSN_seq, 402 &stcb->sctp_socket->so_rcv)) { 403 /* 404 * something is very wrong, either 405 * control_pdapi is NULL, or the tail_mbuf 406 * is corrupt, or there is a EOM already on 407 * the mbuf chain. 408 */ 409 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) { 410 goto abandon; 411 } else { 412 #ifdef INVARIANTS 413 if ((stcb->asoc.control_pdapi == NULL) || (stcb->asoc.control_pdapi->tail_mbuf == NULL)) { 414 panic("This should not happen control_pdapi NULL?"); 415 } 416 /* if we did not panic, it was a EOM */ 417 panic("Bad chunking ??"); 418 #else 419 if ((stcb->asoc.control_pdapi == NULL) || (stcb->asoc.control_pdapi->tail_mbuf == NULL)) { 420 SCTP_PRINTF("This should not happen control_pdapi NULL?\n"); 421 } 422 SCTP_PRINTF("Bad chunking ??\n"); 423 SCTP_PRINTF("Dumping re-assembly queue this will probably hose the association\n"); 424 425 #endif 426 goto abandon; 427 } 428 } 429 cntDel++; 430 } 431 /* pull it we did it */ 432 TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next); 433 /* 434 * EY this is the chunk that should be tagged nr gapped 435 * calculate the gap and such then tag this TSN nr 436 * chk->rec.data.TSN_seq 437 */ 438 /* 439 * EY!-TODO- this tsn should be tagged nr only if it is 440 * out-of-order, the if statement should be modified 441 */ 442 if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && asoc->peer_supports_nr_sack) { 443 444 nr_tsn = chk->rec.data.TSN_seq; 445 SCTP_CALC_TSN_TO_GAP(nr_gap, nr_tsn, asoc->nr_mapping_array_base_tsn); 446 if ((nr_gap >= (uint32_t) (asoc->nr_mapping_array_size << 3)) || 447 (nr_gap >= (uint32_t) (asoc->nr_mapping_array_size << 3))) { 448 /* 449 * EY The 1st should never happen, as in 450 * process_a_data_chunk method this check 451 * should be done 452 */ 453 /* 454 * EY The 2nd should never happen, because 455 * nr_mapping_array is always expanded when 456 * mapping_array is expanded 457 */ 458 printf("Impossible nr_gap ack range failed\n"); 459 } else { 460 SCTP_TCB_LOCK_ASSERT(stcb); 461 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, nr_gap); 462 SCTP_REVERSE_OUT_TSN_PRES(nr_gap, nr_tsn, asoc); 463 if (compare_with_wrap(nr_tsn, asoc->highest_tsn_inside_nr_map, MAX_TSN)) 464 asoc->highest_tsn_inside_nr_map = nr_tsn; 465 } 466 } 467 if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) { 468 asoc->fragmented_delivery_inprogress = 0; 469 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) { 470 asoc->strmin[stream_no].last_sequence_delivered++; 471 } 472 if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0) { 473 SCTP_STAT_INCR_COUNTER64(sctps_reasmusrmsgs); 474 } 475 } else if (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) { 476 /* 477 * turn the flag back on since we just delivered 478 * yet another one. 479 */ 480 asoc->fragmented_delivery_inprogress = 1; 481 } 482 asoc->tsn_of_pdapi_last_delivered = chk->rec.data.TSN_seq; 483 asoc->last_flags_delivered = chk->rec.data.rcv_flags; 484 asoc->last_strm_seq_delivered = chk->rec.data.stream_seq; 485 asoc->last_strm_no_delivered = chk->rec.data.stream_number; 486 487 asoc->tsn_last_delivered = chk->rec.data.TSN_seq; 488 asoc->size_on_reasm_queue -= chk->send_size; 489 sctp_ucount_decr(asoc->cnt_on_reasm_queue); 490 /* free up the chk */ 491 chk->data = NULL; 492 sctp_free_a_chunk(stcb, chk); 493 494 if (asoc->fragmented_delivery_inprogress == 0) { 495 /* 496 * Now lets see if we can deliver the next one on 497 * the stream 498 */ 499 struct sctp_stream_in *strm; 500 501 strm = &asoc->strmin[stream_no]; 502 nxt_todel = strm->last_sequence_delivered + 1; 503 ctl = TAILQ_FIRST(&strm->inqueue); 504 if (ctl && (nxt_todel == ctl->sinfo_ssn)) { 505 while (ctl != NULL) { 506 /* Deliver more if we can. */ 507 if (nxt_todel == ctl->sinfo_ssn) { 508 ctlat = TAILQ_NEXT(ctl, next); 509 TAILQ_REMOVE(&strm->inqueue, ctl, next); 510 asoc->size_on_all_streams -= ctl->length; 511 sctp_ucount_decr(asoc->cnt_on_all_streams); 512 strm->last_sequence_delivered++; 513 /* 514 * EY will be used to 515 * calculate nr-gap 516 */ 517 nr_tsn = ctl->sinfo_tsn; 518 sctp_add_to_readq(stcb->sctp_ep, stcb, 519 ctl, 520 &stcb->sctp_socket->so_rcv, 1, 521 SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED); 522 /* 523 * EY -now something is 524 * delivered, calculate 525 * nr_gap and tag this tsn 526 * NR 527 */ 528 if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && asoc->peer_supports_nr_sack) { 529 SCTP_CALC_TSN_TO_GAP(nr_gap, nr_tsn, asoc->nr_mapping_array_base_tsn); 530 if ((nr_gap >= (SCTP_NR_MAPPING_ARRAY << 3)) || 531 (nr_gap >= (uint32_t) (asoc->nr_mapping_array_size << 3))) { 532 printf("Impossible NR gap calculation?\n"); 533 /* 534 * EY The 535 * 1st 536 * should 537 * never 538 * happen, 539 * as in 540 * process_a_ 541 * data_chunk 542 * method 543 * this 544 * check 545 * should be 546 * done 547 */ 548 /* 549 * EY The 550 * 2nd 551 * should 552 * never 553 * happen, 554 * because 555 * nr_mapping 556 * _array is 557 * always 558 * expanded 559 * when 560 * mapping_ar 561 * ray is 562 * expanded 563 */ 564 } else { 565 SCTP_TCB_LOCK_ASSERT(stcb); 566 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, nr_gap); 567 SCTP_REVERSE_OUT_TSN_PRES(nr_gap, nr_tsn, asoc); 568 if (compare_with_wrap(nr_tsn, 569 asoc->highest_tsn_inside_nr_map, 570 MAX_TSN)) 571 asoc->highest_tsn_inside_nr_map = nr_tsn; 572 } 573 } 574 ctl = ctlat; 575 } else { 576 break; 577 } 578 nxt_todel = strm->last_sequence_delivered + 1; 579 } 580 } 581 break; 582 } 583 /* sa_ignore FREED_MEMORY */ 584 chk = TAILQ_FIRST(&asoc->reasmqueue); 585 } while (chk); 586 } 587 588 /* 589 * Queue the chunk either right into the socket buffer if it is the next one 590 * to go OR put it in the correct place in the delivery queue. If we do 591 * append to the so_buf, keep doing so until we are out of order. One big 592 * question still remains, what to do when the socket buffer is FULL?? 593 */ 594 static void 595 sctp_queue_data_to_stream(struct sctp_tcb *stcb, struct sctp_association *asoc, 596 struct sctp_queued_to_read *control, int *abort_flag) 597 { 598 /* 599 * FIX-ME maybe? What happens when the ssn wraps? If we are getting 600 * all the data in one stream this could happen quite rapidly. One 601 * could use the TSN to keep track of things, but this scheme breaks 602 * down in the other type of stream useage that could occur. Send a 603 * single msg to stream 0, send 4Billion messages to stream 1, now 604 * send a message to stream 0. You have a situation where the TSN 605 * has wrapped but not in the stream. Is this worth worrying about 606 * or should we just change our queue sort at the bottom to be by 607 * TSN. 608 * 609 * Could it also be legal for a peer to send ssn 1 with TSN 2 and ssn 2 610 * with TSN 1? If the peer is doing some sort of funky TSN/SSN 611 * assignment this could happen... and I don't see how this would be 612 * a violation. So for now I am undecided an will leave the sort by 613 * SSN alone. Maybe a hybred approach is the answer 614 * 615 */ 616 struct sctp_stream_in *strm; 617 struct sctp_queued_to_read *at; 618 int queue_needed; 619 uint16_t nxt_todel; 620 struct mbuf *oper; 621 622 /* EY- will be used to calculate nr-gap for a tsn */ 623 uint32_t nr_tsn, nr_gap; 624 625 queue_needed = 1; 626 asoc->size_on_all_streams += control->length; 627 sctp_ucount_incr(asoc->cnt_on_all_streams); 628 strm = &asoc->strmin[control->sinfo_stream]; 629 nxt_todel = strm->last_sequence_delivered + 1; 630 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { 631 sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_INTO_STRD); 632 } 633 SCTPDBG(SCTP_DEBUG_INDATA1, 634 "queue to stream called for ssn:%u lastdel:%u nxt:%u\n", 635 (uint32_t) control->sinfo_stream, 636 (uint32_t) strm->last_sequence_delivered, 637 (uint32_t) nxt_todel); 638 if (compare_with_wrap(strm->last_sequence_delivered, 639 control->sinfo_ssn, MAX_SEQ) || 640 (strm->last_sequence_delivered == control->sinfo_ssn)) { 641 /* The incoming sseq is behind where we last delivered? */ 642 SCTPDBG(SCTP_DEBUG_INDATA1, "Duplicate S-SEQ:%d delivered:%d from peer, Abort association\n", 643 control->sinfo_ssn, strm->last_sequence_delivered); 644 protocol_error: 645 /* 646 * throw it in the stream so it gets cleaned up in 647 * association destruction 648 */ 649 TAILQ_INSERT_HEAD(&strm->inqueue, control, next); 650 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 651 0, M_DONTWAIT, 1, MT_DATA); 652 if (oper) { 653 struct sctp_paramhdr *ph; 654 uint32_t *ippp; 655 656 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + 657 (sizeof(uint32_t) * 3); 658 ph = mtod(oper, struct sctp_paramhdr *); 659 ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 660 ph->param_length = htons(SCTP_BUF_LEN(oper)); 661 ippp = (uint32_t *) (ph + 1); 662 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_1); 663 ippp++; 664 *ippp = control->sinfo_tsn; 665 ippp++; 666 *ippp = ((control->sinfo_stream << 16) | control->sinfo_ssn); 667 } 668 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_1; 669 sctp_abort_an_association(stcb->sctp_ep, stcb, 670 SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); 671 672 *abort_flag = 1; 673 return; 674 675 } 676 if (nxt_todel == control->sinfo_ssn) { 677 /* can be delivered right away? */ 678 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { 679 sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_IMMED_DEL); 680 } 681 /* EY it wont be queued if it could be delivered directly */ 682 queue_needed = 0; 683 asoc->size_on_all_streams -= control->length; 684 sctp_ucount_decr(asoc->cnt_on_all_streams); 685 strm->last_sequence_delivered++; 686 /* EY will be used to calculate nr-gap */ 687 nr_tsn = control->sinfo_tsn; 688 sctp_add_to_readq(stcb->sctp_ep, stcb, 689 control, 690 &stcb->sctp_socket->so_rcv, 1, 691 SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED); 692 /* 693 * EY this is the chunk that should be tagged nr gapped 694 * calculate the gap and such then tag this TSN nr 695 * chk->rec.data.TSN_seq 696 */ 697 if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && asoc->peer_supports_nr_sack) { 698 SCTP_CALC_TSN_TO_GAP(nr_gap, nr_tsn, asoc->nr_mapping_array_base_tsn); 699 if ((nr_gap >= (SCTP_NR_MAPPING_ARRAY << 3)) || 700 (nr_gap >= (uint32_t) (asoc->nr_mapping_array_size << 3))) { 701 printf("Impossible nr_tsn set 2?\n"); 702 /* 703 * EY The 1st should never happen, as in 704 * process_a_data_chunk method this check 705 * should be done 706 */ 707 /* 708 * EY The 2nd should never happen, because 709 * nr_mapping_array is always expanded when 710 * mapping_array is expanded 711 */ 712 } else { 713 SCTP_TCB_LOCK_ASSERT(stcb); 714 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, nr_gap); 715 SCTP_REVERSE_OUT_TSN_PRES(nr_gap, nr_tsn, asoc); 716 if (compare_with_wrap(nr_tsn, asoc->highest_tsn_inside_nr_map, MAX_TSN)) 717 asoc->highest_tsn_inside_nr_map = nr_tsn; 718 } 719 } 720 control = TAILQ_FIRST(&strm->inqueue); 721 while (control != NULL) { 722 /* all delivered */ 723 nxt_todel = strm->last_sequence_delivered + 1; 724 if (nxt_todel == control->sinfo_ssn) { 725 at = TAILQ_NEXT(control, next); 726 TAILQ_REMOVE(&strm->inqueue, control, next); 727 asoc->size_on_all_streams -= control->length; 728 sctp_ucount_decr(asoc->cnt_on_all_streams); 729 strm->last_sequence_delivered++; 730 /* 731 * We ignore the return of deliver_data here 732 * since we always can hold the chunk on the 733 * d-queue. And we have a finite number that 734 * can be delivered from the strq. 735 */ 736 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { 737 sctp_log_strm_del(control, NULL, 738 SCTP_STR_LOG_FROM_IMMED_DEL); 739 } 740 /* EY will be used to calculate nr-gap */ 741 nr_tsn = control->sinfo_tsn; 742 sctp_add_to_readq(stcb->sctp_ep, stcb, 743 control, 744 &stcb->sctp_socket->so_rcv, 1, 745 SCTP_READ_LOCK_NOT_HELD, 746 SCTP_SO_NOT_LOCKED); 747 /* 748 * EY this is the chunk that should be 749 * tagged nr gapped calculate the gap and 750 * such then tag this TSN nr 751 * chk->rec.data.TSN_seq 752 */ 753 if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && asoc->peer_supports_nr_sack) { 754 SCTP_CALC_TSN_TO_GAP(nr_gap, nr_tsn, asoc->nr_mapping_array_base_tsn); 755 if ((nr_gap >= (SCTP_NR_MAPPING_ARRAY << 3)) || 756 (nr_gap >= (uint32_t) (asoc->nr_mapping_array_size << 3))) { 757 printf("Impossible nr TSN set 3?\n"); 758 /* 759 * EY The 1st should never 760 * happen, as in 761 * process_a_data_chunk 762 * method this check should 763 * be done 764 */ 765 /* 766 * EY The 2nd should never 767 * happen, because 768 * nr_mapping_array is 769 * always expanded when 770 * mapping_array is expanded 771 */ 772 } else { 773 SCTP_TCB_LOCK_ASSERT(stcb); 774 SCTP_REVERSE_OUT_TSN_PRES(nr_gap, nr_tsn, asoc); 775 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, nr_gap); 776 if (compare_with_wrap(nr_tsn, asoc->highest_tsn_inside_nr_map, 777 MAX_TSN)) 778 asoc->highest_tsn_inside_nr_map = nr_tsn; 779 } 780 } 781 control = at; 782 continue; 783 } 784 break; 785 } 786 } 787 if (queue_needed) { 788 /* 789 * Ok, we did not deliver this guy, find the correct place 790 * to put it on the queue. 791 */ 792 if ((compare_with_wrap(asoc->cumulative_tsn, 793 control->sinfo_tsn, MAX_TSN)) || 794 (control->sinfo_tsn == asoc->cumulative_tsn)) { 795 goto protocol_error; 796 } 797 if (TAILQ_EMPTY(&strm->inqueue)) { 798 /* Empty queue */ 799 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { 800 sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_INSERT_HD); 801 } 802 TAILQ_INSERT_HEAD(&strm->inqueue, control, next); 803 } else { 804 TAILQ_FOREACH(at, &strm->inqueue, next) { 805 if (compare_with_wrap(at->sinfo_ssn, 806 control->sinfo_ssn, MAX_SEQ)) { 807 /* 808 * one in queue is bigger than the 809 * new one, insert before this one 810 */ 811 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { 812 sctp_log_strm_del(control, at, 813 SCTP_STR_LOG_FROM_INSERT_MD); 814 } 815 TAILQ_INSERT_BEFORE(at, control, next); 816 break; 817 } else if (at->sinfo_ssn == control->sinfo_ssn) { 818 /* 819 * Gak, He sent me a duplicate str 820 * seq number 821 */ 822 /* 823 * foo bar, I guess I will just free 824 * this new guy, should we abort 825 * too? FIX ME MAYBE? Or it COULD be 826 * that the SSN's have wrapped. 827 * Maybe I should compare to TSN 828 * somehow... sigh for now just blow 829 * away the chunk! 830 */ 831 832 if (control->data) 833 sctp_m_freem(control->data); 834 control->data = NULL; 835 asoc->size_on_all_streams -= control->length; 836 sctp_ucount_decr(asoc->cnt_on_all_streams); 837 if (control->whoFrom) 838 sctp_free_remote_addr(control->whoFrom); 839 control->whoFrom = NULL; 840 sctp_free_a_readq(stcb, control); 841 return; 842 } else { 843 if (TAILQ_NEXT(at, next) == NULL) { 844 /* 845 * We are at the end, insert 846 * it after this one 847 */ 848 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { 849 sctp_log_strm_del(control, at, 850 SCTP_STR_LOG_FROM_INSERT_TL); 851 } 852 TAILQ_INSERT_AFTER(&strm->inqueue, 853 at, control, next); 854 break; 855 } 856 } 857 } 858 } 859 } 860 } 861 862 /* 863 * Returns two things: You get the total size of the deliverable parts of the 864 * first fragmented message on the reassembly queue. And you get a 1 back if 865 * all of the message is ready or a 0 back if the message is still incomplete 866 */ 867 static int 868 sctp_is_all_msg_on_reasm(struct sctp_association *asoc, uint32_t * t_size) 869 { 870 struct sctp_tmit_chunk *chk; 871 uint32_t tsn; 872 873 *t_size = 0; 874 chk = TAILQ_FIRST(&asoc->reasmqueue); 875 if (chk == NULL) { 876 /* nothing on the queue */ 877 return (0); 878 } 879 if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0) { 880 /* Not a first on the queue */ 881 return (0); 882 } 883 tsn = chk->rec.data.TSN_seq; 884 while (chk) { 885 if (tsn != chk->rec.data.TSN_seq) { 886 return (0); 887 } 888 *t_size += chk->send_size; 889 if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) { 890 return (1); 891 } 892 tsn++; 893 chk = TAILQ_NEXT(chk, sctp_next); 894 } 895 return (0); 896 } 897 898 static void 899 sctp_deliver_reasm_check(struct sctp_tcb *stcb, struct sctp_association *asoc) 900 { 901 struct sctp_tmit_chunk *chk; 902 uint16_t nxt_todel; 903 uint32_t tsize, pd_point; 904 905 doit_again: 906 chk = TAILQ_FIRST(&asoc->reasmqueue); 907 if (chk == NULL) { 908 /* Huh? */ 909 asoc->size_on_reasm_queue = 0; 910 asoc->cnt_on_reasm_queue = 0; 911 return; 912 } 913 if (asoc->fragmented_delivery_inprogress == 0) { 914 nxt_todel = 915 asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered + 1; 916 if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) && 917 (nxt_todel == chk->rec.data.stream_seq || 918 (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED))) { 919 /* 920 * Yep the first one is here and its ok to deliver 921 * but should we? 922 */ 923 if (stcb->sctp_socket) { 924 pd_point = min(SCTP_SB_LIMIT_RCV(stcb->sctp_socket) >> SCTP_PARTIAL_DELIVERY_SHIFT, 925 stcb->sctp_ep->partial_delivery_point); 926 } else { 927 pd_point = stcb->sctp_ep->partial_delivery_point; 928 } 929 if (sctp_is_all_msg_on_reasm(asoc, &tsize) || (tsize >= pd_point)) { 930 931 /* 932 * Yes, we setup to start reception, by 933 * backing down the TSN just in case we 934 * can't deliver. If we 935 */ 936 asoc->fragmented_delivery_inprogress = 1; 937 asoc->tsn_last_delivered = 938 chk->rec.data.TSN_seq - 1; 939 asoc->str_of_pdapi = 940 chk->rec.data.stream_number; 941 asoc->ssn_of_pdapi = chk->rec.data.stream_seq; 942 asoc->pdapi_ppid = chk->rec.data.payloadtype; 943 asoc->fragment_flags = chk->rec.data.rcv_flags; 944 sctp_service_reassembly(stcb, asoc); 945 } 946 } 947 } else { 948 /* 949 * Service re-assembly will deliver stream data queued at 950 * the end of fragmented delivery.. but it wont know to go 951 * back and call itself again... we do that here with the 952 * got doit_again 953 */ 954 sctp_service_reassembly(stcb, asoc); 955 if (asoc->fragmented_delivery_inprogress == 0) { 956 /* 957 * finished our Fragmented delivery, could be more 958 * waiting? 959 */ 960 goto doit_again; 961 } 962 } 963 } 964 965 /* 966 * Dump onto the re-assembly queue, in its proper place. After dumping on the 967 * queue, see if anthing can be delivered. If so pull it off (or as much as 968 * we can. If we run out of space then we must dump what we can and set the 969 * appropriate flag to say we queued what we could. 970 */ 971 static void 972 sctp_queue_data_for_reasm(struct sctp_tcb *stcb, struct sctp_association *asoc, 973 struct sctp_tmit_chunk *chk, int *abort_flag) 974 { 975 struct mbuf *oper; 976 uint32_t cum_ackp1, last_tsn, prev_tsn, post_tsn; 977 u_char last_flags; 978 struct sctp_tmit_chunk *at, *prev, *next; 979 980 prev = next = NULL; 981 cum_ackp1 = asoc->tsn_last_delivered + 1; 982 if (TAILQ_EMPTY(&asoc->reasmqueue)) { 983 /* This is the first one on the queue */ 984 TAILQ_INSERT_HEAD(&asoc->reasmqueue, chk, sctp_next); 985 /* 986 * we do not check for delivery of anything when only one 987 * fragment is here 988 */ 989 asoc->size_on_reasm_queue = chk->send_size; 990 sctp_ucount_incr(asoc->cnt_on_reasm_queue); 991 if (chk->rec.data.TSN_seq == cum_ackp1) { 992 if (asoc->fragmented_delivery_inprogress == 0 && 993 (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) != 994 SCTP_DATA_FIRST_FRAG) { 995 /* 996 * An empty queue, no delivery inprogress, 997 * we hit the next one and it does NOT have 998 * a FIRST fragment mark. 999 */ 1000 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, its not first, no fragmented delivery in progress\n"); 1001 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 1002 0, M_DONTWAIT, 1, MT_DATA); 1003 1004 if (oper) { 1005 struct sctp_paramhdr *ph; 1006 uint32_t *ippp; 1007 1008 SCTP_BUF_LEN(oper) = 1009 sizeof(struct sctp_paramhdr) + 1010 (sizeof(uint32_t) * 3); 1011 ph = mtod(oper, struct sctp_paramhdr *); 1012 ph->param_type = 1013 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 1014 ph->param_length = htons(SCTP_BUF_LEN(oper)); 1015 ippp = (uint32_t *) (ph + 1); 1016 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_2); 1017 ippp++; 1018 *ippp = chk->rec.data.TSN_seq; 1019 ippp++; 1020 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); 1021 1022 } 1023 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_2; 1024 sctp_abort_an_association(stcb->sctp_ep, stcb, 1025 SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); 1026 *abort_flag = 1; 1027 } else if (asoc->fragmented_delivery_inprogress && 1028 (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == SCTP_DATA_FIRST_FRAG) { 1029 /* 1030 * We are doing a partial delivery and the 1031 * NEXT chunk MUST be either the LAST or 1032 * MIDDLE fragment NOT a FIRST 1033 */ 1034 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it IS a first and fragmented delivery in progress\n"); 1035 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 1036 0, M_DONTWAIT, 1, MT_DATA); 1037 if (oper) { 1038 struct sctp_paramhdr *ph; 1039 uint32_t *ippp; 1040 1041 SCTP_BUF_LEN(oper) = 1042 sizeof(struct sctp_paramhdr) + 1043 (3 * sizeof(uint32_t)); 1044 ph = mtod(oper, struct sctp_paramhdr *); 1045 ph->param_type = 1046 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 1047 ph->param_length = htons(SCTP_BUF_LEN(oper)); 1048 ippp = (uint32_t *) (ph + 1); 1049 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_3); 1050 ippp++; 1051 *ippp = chk->rec.data.TSN_seq; 1052 ippp++; 1053 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); 1054 } 1055 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_3; 1056 sctp_abort_an_association(stcb->sctp_ep, stcb, 1057 SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); 1058 *abort_flag = 1; 1059 } else if (asoc->fragmented_delivery_inprogress) { 1060 /* 1061 * Here we are ok with a MIDDLE or LAST 1062 * piece 1063 */ 1064 if (chk->rec.data.stream_number != 1065 asoc->str_of_pdapi) { 1066 /* Got to be the right STR No */ 1067 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it IS not same stream number %d vs %d\n", 1068 chk->rec.data.stream_number, 1069 asoc->str_of_pdapi); 1070 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 1071 0, M_DONTWAIT, 1, MT_DATA); 1072 if (oper) { 1073 struct sctp_paramhdr *ph; 1074 uint32_t *ippp; 1075 1076 SCTP_BUF_LEN(oper) = 1077 sizeof(struct sctp_paramhdr) + 1078 (sizeof(uint32_t) * 3); 1079 ph = mtod(oper, 1080 struct sctp_paramhdr *); 1081 ph->param_type = 1082 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 1083 ph->param_length = 1084 htons(SCTP_BUF_LEN(oper)); 1085 ippp = (uint32_t *) (ph + 1); 1086 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_4); 1087 ippp++; 1088 *ippp = chk->rec.data.TSN_seq; 1089 ippp++; 1090 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); 1091 } 1092 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_4; 1093 sctp_abort_an_association(stcb->sctp_ep, 1094 stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); 1095 *abort_flag = 1; 1096 } else if ((asoc->fragment_flags & SCTP_DATA_UNORDERED) != 1097 SCTP_DATA_UNORDERED && 1098 chk->rec.data.stream_seq != 1099 asoc->ssn_of_pdapi) { 1100 /* Got to be the right STR Seq */ 1101 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it IS not same stream seq %d vs %d\n", 1102 chk->rec.data.stream_seq, 1103 asoc->ssn_of_pdapi); 1104 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 1105 0, M_DONTWAIT, 1, MT_DATA); 1106 if (oper) { 1107 struct sctp_paramhdr *ph; 1108 uint32_t *ippp; 1109 1110 SCTP_BUF_LEN(oper) = 1111 sizeof(struct sctp_paramhdr) + 1112 (3 * sizeof(uint32_t)); 1113 ph = mtod(oper, 1114 struct sctp_paramhdr *); 1115 ph->param_type = 1116 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 1117 ph->param_length = 1118 htons(SCTP_BUF_LEN(oper)); 1119 ippp = (uint32_t *) (ph + 1); 1120 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_5); 1121 ippp++; 1122 *ippp = chk->rec.data.TSN_seq; 1123 ippp++; 1124 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); 1125 1126 } 1127 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_5; 1128 sctp_abort_an_association(stcb->sctp_ep, 1129 stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); 1130 *abort_flag = 1; 1131 } 1132 } 1133 } 1134 return; 1135 } 1136 /* Find its place */ 1137 TAILQ_FOREACH(at, &asoc->reasmqueue, sctp_next) { 1138 if (compare_with_wrap(at->rec.data.TSN_seq, 1139 chk->rec.data.TSN_seq, MAX_TSN)) { 1140 /* 1141 * one in queue is bigger than the new one, insert 1142 * before this one 1143 */ 1144 /* A check */ 1145 asoc->size_on_reasm_queue += chk->send_size; 1146 sctp_ucount_incr(asoc->cnt_on_reasm_queue); 1147 next = at; 1148 TAILQ_INSERT_BEFORE(at, chk, sctp_next); 1149 break; 1150 } else if (at->rec.data.TSN_seq == chk->rec.data.TSN_seq) { 1151 /* Gak, He sent me a duplicate str seq number */ 1152 /* 1153 * foo bar, I guess I will just free this new guy, 1154 * should we abort too? FIX ME MAYBE? Or it COULD be 1155 * that the SSN's have wrapped. Maybe I should 1156 * compare to TSN somehow... sigh for now just blow 1157 * away the chunk! 1158 */ 1159 if (chk->data) { 1160 sctp_m_freem(chk->data); 1161 chk->data = NULL; 1162 } 1163 sctp_free_a_chunk(stcb, chk); 1164 return; 1165 } else { 1166 last_flags = at->rec.data.rcv_flags; 1167 last_tsn = at->rec.data.TSN_seq; 1168 prev = at; 1169 if (TAILQ_NEXT(at, sctp_next) == NULL) { 1170 /* 1171 * We are at the end, insert it after this 1172 * one 1173 */ 1174 /* check it first */ 1175 asoc->size_on_reasm_queue += chk->send_size; 1176 sctp_ucount_incr(asoc->cnt_on_reasm_queue); 1177 TAILQ_INSERT_AFTER(&asoc->reasmqueue, at, chk, sctp_next); 1178 break; 1179 } 1180 } 1181 } 1182 /* Now the audits */ 1183 if (prev) { 1184 prev_tsn = chk->rec.data.TSN_seq - 1; 1185 if (prev_tsn == prev->rec.data.TSN_seq) { 1186 /* 1187 * Ok the one I am dropping onto the end is the 1188 * NEXT. A bit of valdiation here. 1189 */ 1190 if ((prev->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) == 1191 SCTP_DATA_FIRST_FRAG || 1192 (prev->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) == 1193 SCTP_DATA_MIDDLE_FRAG) { 1194 /* 1195 * Insert chk MUST be a MIDDLE or LAST 1196 * fragment 1197 */ 1198 if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) == 1199 SCTP_DATA_FIRST_FRAG) { 1200 SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - It can be a midlle or last but not a first\n"); 1201 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it's a FIRST!\n"); 1202 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 1203 0, M_DONTWAIT, 1, MT_DATA); 1204 if (oper) { 1205 struct sctp_paramhdr *ph; 1206 uint32_t *ippp; 1207 1208 SCTP_BUF_LEN(oper) = 1209 sizeof(struct sctp_paramhdr) + 1210 (3 * sizeof(uint32_t)); 1211 ph = mtod(oper, 1212 struct sctp_paramhdr *); 1213 ph->param_type = 1214 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 1215 ph->param_length = 1216 htons(SCTP_BUF_LEN(oper)); 1217 ippp = (uint32_t *) (ph + 1); 1218 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_6); 1219 ippp++; 1220 *ippp = chk->rec.data.TSN_seq; 1221 ippp++; 1222 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); 1223 1224 } 1225 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_6; 1226 sctp_abort_an_association(stcb->sctp_ep, 1227 stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); 1228 *abort_flag = 1; 1229 return; 1230 } 1231 if (chk->rec.data.stream_number != 1232 prev->rec.data.stream_number) { 1233 /* 1234 * Huh, need the correct STR here, 1235 * they must be the same. 1236 */ 1237 SCTP_PRINTF("Prev check - Gak, Evil plot, ssn:%d not the same as at:%d\n", 1238 chk->rec.data.stream_number, 1239 prev->rec.data.stream_number); 1240 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 1241 0, M_DONTWAIT, 1, MT_DATA); 1242 if (oper) { 1243 struct sctp_paramhdr *ph; 1244 uint32_t *ippp; 1245 1246 SCTP_BUF_LEN(oper) = 1247 sizeof(struct sctp_paramhdr) + 1248 (3 * sizeof(uint32_t)); 1249 ph = mtod(oper, 1250 struct sctp_paramhdr *); 1251 ph->param_type = 1252 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 1253 ph->param_length = 1254 htons(SCTP_BUF_LEN(oper)); 1255 ippp = (uint32_t *) (ph + 1); 1256 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_7); 1257 ippp++; 1258 *ippp = chk->rec.data.TSN_seq; 1259 ippp++; 1260 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); 1261 } 1262 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_7; 1263 sctp_abort_an_association(stcb->sctp_ep, 1264 stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); 1265 1266 *abort_flag = 1; 1267 return; 1268 } 1269 if ((prev->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0 && 1270 chk->rec.data.stream_seq != 1271 prev->rec.data.stream_seq) { 1272 /* 1273 * Huh, need the correct STR here, 1274 * they must be the same. 1275 */ 1276 SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - Gak, Evil plot, sseq:%d not the same as at:%d\n", 1277 chk->rec.data.stream_seq, 1278 prev->rec.data.stream_seq); 1279 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 1280 0, M_DONTWAIT, 1, MT_DATA); 1281 if (oper) { 1282 struct sctp_paramhdr *ph; 1283 uint32_t *ippp; 1284 1285 SCTP_BUF_LEN(oper) = 1286 sizeof(struct sctp_paramhdr) + 1287 (3 * sizeof(uint32_t)); 1288 ph = mtod(oper, 1289 struct sctp_paramhdr *); 1290 ph->param_type = 1291 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 1292 ph->param_length = 1293 htons(SCTP_BUF_LEN(oper)); 1294 ippp = (uint32_t *) (ph + 1); 1295 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_8); 1296 ippp++; 1297 *ippp = chk->rec.data.TSN_seq; 1298 ippp++; 1299 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); 1300 } 1301 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_8; 1302 sctp_abort_an_association(stcb->sctp_ep, 1303 stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); 1304 1305 *abort_flag = 1; 1306 return; 1307 } 1308 } else if ((prev->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) == 1309 SCTP_DATA_LAST_FRAG) { 1310 /* Insert chk MUST be a FIRST */ 1311 if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) != 1312 SCTP_DATA_FIRST_FRAG) { 1313 SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - Gak, evil plot, its not FIRST and it must be!\n"); 1314 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 1315 0, M_DONTWAIT, 1, MT_DATA); 1316 if (oper) { 1317 struct sctp_paramhdr *ph; 1318 uint32_t *ippp; 1319 1320 SCTP_BUF_LEN(oper) = 1321 sizeof(struct sctp_paramhdr) + 1322 (3 * sizeof(uint32_t)); 1323 ph = mtod(oper, 1324 struct sctp_paramhdr *); 1325 ph->param_type = 1326 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 1327 ph->param_length = 1328 htons(SCTP_BUF_LEN(oper)); 1329 ippp = (uint32_t *) (ph + 1); 1330 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_9); 1331 ippp++; 1332 *ippp = chk->rec.data.TSN_seq; 1333 ippp++; 1334 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); 1335 1336 } 1337 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_9; 1338 sctp_abort_an_association(stcb->sctp_ep, 1339 stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); 1340 1341 *abort_flag = 1; 1342 return; 1343 } 1344 } 1345 } 1346 } 1347 if (next) { 1348 post_tsn = chk->rec.data.TSN_seq + 1; 1349 if (post_tsn == next->rec.data.TSN_seq) { 1350 /* 1351 * Ok the one I am inserting ahead of is my NEXT 1352 * one. A bit of valdiation here. 1353 */ 1354 if (next->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) { 1355 /* Insert chk MUST be a last fragment */ 1356 if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) 1357 != SCTP_DATA_LAST_FRAG) { 1358 SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Next is FIRST, we must be LAST\n"); 1359 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, its not a last!\n"); 1360 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 1361 0, M_DONTWAIT, 1, MT_DATA); 1362 if (oper) { 1363 struct sctp_paramhdr *ph; 1364 uint32_t *ippp; 1365 1366 SCTP_BUF_LEN(oper) = 1367 sizeof(struct sctp_paramhdr) + 1368 (3 * sizeof(uint32_t)); 1369 ph = mtod(oper, 1370 struct sctp_paramhdr *); 1371 ph->param_type = 1372 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 1373 ph->param_length = 1374 htons(SCTP_BUF_LEN(oper)); 1375 ippp = (uint32_t *) (ph + 1); 1376 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_10); 1377 ippp++; 1378 *ippp = chk->rec.data.TSN_seq; 1379 ippp++; 1380 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); 1381 } 1382 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_10; 1383 sctp_abort_an_association(stcb->sctp_ep, 1384 stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); 1385 1386 *abort_flag = 1; 1387 return; 1388 } 1389 } else if ((next->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) == 1390 SCTP_DATA_MIDDLE_FRAG || 1391 (next->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) == 1392 SCTP_DATA_LAST_FRAG) { 1393 /* 1394 * Insert chk CAN be MIDDLE or FIRST NOT 1395 * LAST 1396 */ 1397 if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) == 1398 SCTP_DATA_LAST_FRAG) { 1399 SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Next is a MIDDLE/LAST\n"); 1400 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, new prev chunk is a LAST\n"); 1401 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 1402 0, M_DONTWAIT, 1, MT_DATA); 1403 if (oper) { 1404 struct sctp_paramhdr *ph; 1405 uint32_t *ippp; 1406 1407 SCTP_BUF_LEN(oper) = 1408 sizeof(struct sctp_paramhdr) + 1409 (3 * sizeof(uint32_t)); 1410 ph = mtod(oper, 1411 struct sctp_paramhdr *); 1412 ph->param_type = 1413 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 1414 ph->param_length = 1415 htons(SCTP_BUF_LEN(oper)); 1416 ippp = (uint32_t *) (ph + 1); 1417 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_11); 1418 ippp++; 1419 *ippp = chk->rec.data.TSN_seq; 1420 ippp++; 1421 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); 1422 1423 } 1424 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_11; 1425 sctp_abort_an_association(stcb->sctp_ep, 1426 stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); 1427 1428 *abort_flag = 1; 1429 return; 1430 } 1431 if (chk->rec.data.stream_number != 1432 next->rec.data.stream_number) { 1433 /* 1434 * Huh, need the correct STR here, 1435 * they must be the same. 1436 */ 1437 SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Gak, Evil plot, ssn:%d not the same as at:%d\n", 1438 chk->rec.data.stream_number, 1439 next->rec.data.stream_number); 1440 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 1441 0, M_DONTWAIT, 1, MT_DATA); 1442 if (oper) { 1443 struct sctp_paramhdr *ph; 1444 uint32_t *ippp; 1445 1446 SCTP_BUF_LEN(oper) = 1447 sizeof(struct sctp_paramhdr) + 1448 (3 * sizeof(uint32_t)); 1449 ph = mtod(oper, 1450 struct sctp_paramhdr *); 1451 ph->param_type = 1452 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 1453 ph->param_length = 1454 htons(SCTP_BUF_LEN(oper)); 1455 ippp = (uint32_t *) (ph + 1); 1456 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_12); 1457 ippp++; 1458 *ippp = chk->rec.data.TSN_seq; 1459 ippp++; 1460 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); 1461 1462 } 1463 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_12; 1464 sctp_abort_an_association(stcb->sctp_ep, 1465 stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); 1466 1467 *abort_flag = 1; 1468 return; 1469 } 1470 if ((next->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0 && 1471 chk->rec.data.stream_seq != 1472 next->rec.data.stream_seq) { 1473 /* 1474 * Huh, need the correct STR here, 1475 * they must be the same. 1476 */ 1477 SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Gak, Evil plot, sseq:%d not the same as at:%d\n", 1478 chk->rec.data.stream_seq, 1479 next->rec.data.stream_seq); 1480 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 1481 0, M_DONTWAIT, 1, MT_DATA); 1482 if (oper) { 1483 struct sctp_paramhdr *ph; 1484 uint32_t *ippp; 1485 1486 SCTP_BUF_LEN(oper) = 1487 sizeof(struct sctp_paramhdr) + 1488 (3 * sizeof(uint32_t)); 1489 ph = mtod(oper, 1490 struct sctp_paramhdr *); 1491 ph->param_type = 1492 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 1493 ph->param_length = 1494 htons(SCTP_BUF_LEN(oper)); 1495 ippp = (uint32_t *) (ph + 1); 1496 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_13); 1497 ippp++; 1498 *ippp = chk->rec.data.TSN_seq; 1499 ippp++; 1500 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); 1501 } 1502 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_13; 1503 sctp_abort_an_association(stcb->sctp_ep, 1504 stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); 1505 1506 *abort_flag = 1; 1507 return; 1508 } 1509 } 1510 } 1511 } 1512 /* Do we need to do some delivery? check */ 1513 sctp_deliver_reasm_check(stcb, asoc); 1514 } 1515 1516 /* 1517 * This is an unfortunate routine. It checks to make sure a evil guy is not 1518 * stuffing us full of bad packet fragments. A broken peer could also do this 1519 * but this is doubtful. It is to bad I must worry about evil crackers sigh 1520 * :< more cycles. 1521 */ 1522 static int 1523 sctp_does_tsn_belong_to_reasm(struct sctp_association *asoc, 1524 uint32_t TSN_seq) 1525 { 1526 struct sctp_tmit_chunk *at; 1527 uint32_t tsn_est; 1528 1529 TAILQ_FOREACH(at, &asoc->reasmqueue, sctp_next) { 1530 if (compare_with_wrap(TSN_seq, 1531 at->rec.data.TSN_seq, MAX_TSN)) { 1532 /* is it one bigger? */ 1533 tsn_est = at->rec.data.TSN_seq + 1; 1534 if (tsn_est == TSN_seq) { 1535 /* yep. It better be a last then */ 1536 if ((at->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) != 1537 SCTP_DATA_LAST_FRAG) { 1538 /* 1539 * Ok this guy belongs next to a guy 1540 * that is NOT last, it should be a 1541 * middle/last, not a complete 1542 * chunk. 1543 */ 1544 return (1); 1545 } else { 1546 /* 1547 * This guy is ok since its a LAST 1548 * and the new chunk is a fully 1549 * self- contained one. 1550 */ 1551 return (0); 1552 } 1553 } 1554 } else if (TSN_seq == at->rec.data.TSN_seq) { 1555 /* Software error since I have a dup? */ 1556 return (1); 1557 } else { 1558 /* 1559 * Ok, 'at' is larger than new chunk but does it 1560 * need to be right before it. 1561 */ 1562 tsn_est = TSN_seq + 1; 1563 if (tsn_est == at->rec.data.TSN_seq) { 1564 /* Yep, It better be a first */ 1565 if ((at->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) != 1566 SCTP_DATA_FIRST_FRAG) { 1567 return (1); 1568 } else { 1569 return (0); 1570 } 1571 } 1572 } 1573 } 1574 return (0); 1575 } 1576 1577 1578 static int 1579 sctp_process_a_data_chunk(struct sctp_tcb *stcb, struct sctp_association *asoc, 1580 struct mbuf **m, int offset, struct sctp_data_chunk *ch, int chk_length, 1581 struct sctp_nets *net, uint32_t * high_tsn, int *abort_flag, 1582 int *break_flag, int last_chunk) 1583 { 1584 /* Process a data chunk */ 1585 /* struct sctp_tmit_chunk *chk; */ 1586 struct sctp_tmit_chunk *chk; 1587 uint32_t tsn, gap; 1588 1589 /* EY - for nr_sack */ 1590 uint32_t nr_gap; 1591 struct mbuf *dmbuf; 1592 int indx, the_len; 1593 int need_reasm_check = 0; 1594 uint16_t strmno, strmseq; 1595 struct mbuf *oper; 1596 struct sctp_queued_to_read *control; 1597 int ordered; 1598 uint32_t protocol_id; 1599 uint8_t chunk_flags; 1600 struct sctp_stream_reset_list *liste; 1601 1602 chk = NULL; 1603 tsn = ntohl(ch->dp.tsn); 1604 chunk_flags = ch->ch.chunk_flags; 1605 if ((chunk_flags & SCTP_DATA_SACK_IMMEDIATELY) == SCTP_DATA_SACK_IMMEDIATELY) { 1606 asoc->send_sack = 1; 1607 } 1608 protocol_id = ch->dp.protocol_id; 1609 ordered = ((ch->ch.chunk_flags & SCTP_DATA_UNORDERED) == 0); 1610 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 1611 sctp_log_map(tsn, asoc->cumulative_tsn, asoc->highest_tsn_inside_map, SCTP_MAP_TSN_ENTERS); 1612 } 1613 if (stcb == NULL) { 1614 return (0); 1615 } 1616 SCTP_LTRACE_CHK(stcb->sctp_ep, stcb, ch->ch.chunk_type, tsn); 1617 if (compare_with_wrap(asoc->cumulative_tsn, tsn, MAX_TSN) || 1618 asoc->cumulative_tsn == tsn) { 1619 /* It is a duplicate */ 1620 SCTP_STAT_INCR(sctps_recvdupdata); 1621 if (asoc->numduptsns < SCTP_MAX_DUP_TSNS) { 1622 /* Record a dup for the next outbound sack */ 1623 asoc->dup_tsns[asoc->numduptsns] = tsn; 1624 asoc->numduptsns++; 1625 } 1626 asoc->send_sack = 1; 1627 return (0); 1628 } 1629 /* Calculate the number of TSN's between the base and this TSN */ 1630 SCTP_CALC_TSN_TO_GAP(gap, tsn, asoc->mapping_array_base_tsn); 1631 if (gap >= (SCTP_MAPPING_ARRAY << 3)) { 1632 /* Can't hold the bit in the mapping at max array, toss it */ 1633 return (0); 1634 } 1635 if (gap >= (uint32_t) (asoc->mapping_array_size << 3)) { 1636 SCTP_TCB_LOCK_ASSERT(stcb); 1637 if (sctp_expand_mapping_array(asoc, gap)) { 1638 /* Can't expand, drop it */ 1639 return (0); 1640 } 1641 } 1642 /* EY - for nr_sack */ 1643 nr_gap = gap; 1644 1645 if (compare_with_wrap(tsn, *high_tsn, MAX_TSN)) { 1646 *high_tsn = tsn; 1647 } 1648 /* See if we have received this one already */ 1649 if (SCTP_IS_TSN_PRESENT(asoc->mapping_array, gap)) { 1650 SCTP_STAT_INCR(sctps_recvdupdata); 1651 if (asoc->numduptsns < SCTP_MAX_DUP_TSNS) { 1652 /* Record a dup for the next outbound sack */ 1653 asoc->dup_tsns[asoc->numduptsns] = tsn; 1654 asoc->numduptsns++; 1655 } 1656 asoc->send_sack = 1; 1657 return (0); 1658 } 1659 /* 1660 * Check to see about the GONE flag, duplicates would cause a sack 1661 * to be sent up above 1662 */ 1663 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 1664 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || 1665 (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET)) 1666 ) { 1667 /* 1668 * wait a minute, this guy is gone, there is no longer a 1669 * receiver. Send peer an ABORT! 1670 */ 1671 struct mbuf *op_err; 1672 1673 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 1674 sctp_abort_an_association(stcb->sctp_ep, stcb, 0, op_err, SCTP_SO_NOT_LOCKED); 1675 *abort_flag = 1; 1676 return (0); 1677 } 1678 /* 1679 * Now before going further we see if there is room. If NOT then we 1680 * MAY let one through only IF this TSN is the one we are waiting 1681 * for on a partial delivery API. 1682 */ 1683 1684 /* now do the tests */ 1685 if (((asoc->cnt_on_all_streams + 1686 asoc->cnt_on_reasm_queue + 1687 asoc->cnt_msg_on_sb) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue)) || 1688 (((int)asoc->my_rwnd) <= 0)) { 1689 /* 1690 * When we have NO room in the rwnd we check to make sure 1691 * the reader is doing its job... 1692 */ 1693 if (stcb->sctp_socket->so_rcv.sb_cc) { 1694 /* some to read, wake-up */ 1695 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1696 struct socket *so; 1697 1698 so = SCTP_INP_SO(stcb->sctp_ep); 1699 atomic_add_int(&stcb->asoc.refcnt, 1); 1700 SCTP_TCB_UNLOCK(stcb); 1701 SCTP_SOCKET_LOCK(so, 1); 1702 SCTP_TCB_LOCK(stcb); 1703 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1704 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1705 /* assoc was freed while we were unlocked */ 1706 SCTP_SOCKET_UNLOCK(so, 1); 1707 return (0); 1708 } 1709 #endif 1710 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 1711 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1712 SCTP_SOCKET_UNLOCK(so, 1); 1713 #endif 1714 } 1715 /* now is it in the mapping array of what we have accepted? */ 1716 if (compare_with_wrap(tsn, asoc->highest_tsn_inside_map, MAX_TSN)) { 1717 /* Nope not in the valid range dump it */ 1718 sctp_set_rwnd(stcb, asoc); 1719 if ((asoc->cnt_on_all_streams + 1720 asoc->cnt_on_reasm_queue + 1721 asoc->cnt_msg_on_sb) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue)) { 1722 SCTP_STAT_INCR(sctps_datadropchklmt); 1723 } else { 1724 SCTP_STAT_INCR(sctps_datadroprwnd); 1725 } 1726 indx = *break_flag; 1727 *break_flag = 1; 1728 return (0); 1729 } 1730 } 1731 strmno = ntohs(ch->dp.stream_id); 1732 if (strmno >= asoc->streamincnt) { 1733 struct sctp_paramhdr *phdr; 1734 struct mbuf *mb; 1735 1736 mb = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) * 2), 1737 0, M_DONTWAIT, 1, MT_DATA); 1738 if (mb != NULL) { 1739 /* add some space up front so prepend will work well */ 1740 SCTP_BUF_RESV_UF(mb, sizeof(struct sctp_chunkhdr)); 1741 phdr = mtod(mb, struct sctp_paramhdr *); 1742 /* 1743 * Error causes are just param's and this one has 1744 * two back to back phdr, one with the error type 1745 * and size, the other with the streamid and a rsvd 1746 */ 1747 SCTP_BUF_LEN(mb) = (sizeof(struct sctp_paramhdr) * 2); 1748 phdr->param_type = htons(SCTP_CAUSE_INVALID_STREAM); 1749 phdr->param_length = 1750 htons(sizeof(struct sctp_paramhdr) * 2); 1751 phdr++; 1752 /* We insert the stream in the type field */ 1753 phdr->param_type = ch->dp.stream_id; 1754 /* And set the length to 0 for the rsvd field */ 1755 phdr->param_length = 0; 1756 sctp_queue_op_err(stcb, mb); 1757 } 1758 SCTP_STAT_INCR(sctps_badsid); 1759 SCTP_TCB_LOCK_ASSERT(stcb); 1760 SCTP_SET_TSN_PRESENT(asoc->mapping_array, gap); 1761 /* EY set this tsn present in nr_sack's nr_mapping_array */ 1762 if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && asoc->peer_supports_nr_sack) { 1763 SCTP_TCB_LOCK_ASSERT(stcb); 1764 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap); 1765 SCTP_REVERSE_OUT_TSN_PRES(gap, tsn, asoc); 1766 } 1767 if (compare_with_wrap(tsn, asoc->highest_tsn_inside_map, MAX_TSN)) { 1768 /* we have a new high score */ 1769 asoc->highest_tsn_inside_map = tsn; 1770 /* EY nr_sack version of the above */ 1771 if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && asoc->peer_supports_nr_sack) 1772 asoc->highest_tsn_inside_nr_map = tsn; 1773 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 1774 sctp_log_map(0, 2, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 1775 } 1776 } 1777 if (tsn == (asoc->cumulative_tsn + 1)) { 1778 /* Update cum-ack */ 1779 asoc->cumulative_tsn = tsn; 1780 } 1781 return (0); 1782 } 1783 /* 1784 * Before we continue lets validate that we are not being fooled by 1785 * an evil attacker. We can only have 4k chunks based on our TSN 1786 * spread allowed by the mapping array 512 * 8 bits, so there is no 1787 * way our stream sequence numbers could have wrapped. We of course 1788 * only validate the FIRST fragment so the bit must be set. 1789 */ 1790 strmseq = ntohs(ch->dp.stream_sequence); 1791 #ifdef SCTP_ASOCLOG_OF_TSNS 1792 SCTP_TCB_LOCK_ASSERT(stcb); 1793 if (asoc->tsn_in_at >= SCTP_TSN_LOG_SIZE) { 1794 asoc->tsn_in_at = 0; 1795 asoc->tsn_in_wrapped = 1; 1796 } 1797 asoc->in_tsnlog[asoc->tsn_in_at].tsn = tsn; 1798 asoc->in_tsnlog[asoc->tsn_in_at].strm = strmno; 1799 asoc->in_tsnlog[asoc->tsn_in_at].seq = strmseq; 1800 asoc->in_tsnlog[asoc->tsn_in_at].sz = chk_length; 1801 asoc->in_tsnlog[asoc->tsn_in_at].flgs = chunk_flags; 1802 asoc->in_tsnlog[asoc->tsn_in_at].stcb = (void *)stcb; 1803 asoc->in_tsnlog[asoc->tsn_in_at].in_pos = asoc->tsn_in_at; 1804 asoc->in_tsnlog[asoc->tsn_in_at].in_out = 1; 1805 asoc->tsn_in_at++; 1806 #endif 1807 if ((chunk_flags & SCTP_DATA_FIRST_FRAG) && 1808 (TAILQ_EMPTY(&asoc->resetHead)) && 1809 (chunk_flags & SCTP_DATA_UNORDERED) == 0 && 1810 (compare_with_wrap(asoc->strmin[strmno].last_sequence_delivered, 1811 strmseq, MAX_SEQ) || 1812 asoc->strmin[strmno].last_sequence_delivered == strmseq)) { 1813 /* The incoming sseq is behind where we last delivered? */ 1814 SCTPDBG(SCTP_DEBUG_INDATA1, "EVIL/Broken-Dup S-SEQ:%d delivered:%d from peer, Abort!\n", 1815 strmseq, asoc->strmin[strmno].last_sequence_delivered); 1816 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 1817 0, M_DONTWAIT, 1, MT_DATA); 1818 if (oper) { 1819 struct sctp_paramhdr *ph; 1820 uint32_t *ippp; 1821 1822 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + 1823 (3 * sizeof(uint32_t)); 1824 ph = mtod(oper, struct sctp_paramhdr *); 1825 ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 1826 ph->param_length = htons(SCTP_BUF_LEN(oper)); 1827 ippp = (uint32_t *) (ph + 1); 1828 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_14); 1829 ippp++; 1830 *ippp = tsn; 1831 ippp++; 1832 *ippp = ((strmno << 16) | strmseq); 1833 1834 } 1835 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_14; 1836 sctp_abort_an_association(stcb->sctp_ep, stcb, 1837 SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); 1838 *abort_flag = 1; 1839 return (0); 1840 } 1841 /************************************ 1842 * From here down we may find ch-> invalid 1843 * so its a good idea NOT to use it. 1844 *************************************/ 1845 1846 the_len = (chk_length - sizeof(struct sctp_data_chunk)); 1847 if (last_chunk == 0) { 1848 dmbuf = SCTP_M_COPYM(*m, 1849 (offset + sizeof(struct sctp_data_chunk)), 1850 the_len, M_DONTWAIT); 1851 #ifdef SCTP_MBUF_LOGGING 1852 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 1853 struct mbuf *mat; 1854 1855 mat = dmbuf; 1856 while (mat) { 1857 if (SCTP_BUF_IS_EXTENDED(mat)) { 1858 sctp_log_mb(mat, SCTP_MBUF_ICOPY); 1859 } 1860 mat = SCTP_BUF_NEXT(mat); 1861 } 1862 } 1863 #endif 1864 } else { 1865 /* We can steal the last chunk */ 1866 int l_len; 1867 1868 dmbuf = *m; 1869 /* lop off the top part */ 1870 m_adj(dmbuf, (offset + sizeof(struct sctp_data_chunk))); 1871 if (SCTP_BUF_NEXT(dmbuf) == NULL) { 1872 l_len = SCTP_BUF_LEN(dmbuf); 1873 } else { 1874 /* 1875 * need to count up the size hopefully does not hit 1876 * this to often :-0 1877 */ 1878 struct mbuf *lat; 1879 1880 l_len = 0; 1881 lat = dmbuf; 1882 while (lat) { 1883 l_len += SCTP_BUF_LEN(lat); 1884 lat = SCTP_BUF_NEXT(lat); 1885 } 1886 } 1887 if (l_len > the_len) { 1888 /* Trim the end round bytes off too */ 1889 m_adj(dmbuf, -(l_len - the_len)); 1890 } 1891 } 1892 if (dmbuf == NULL) { 1893 SCTP_STAT_INCR(sctps_nomem); 1894 return (0); 1895 } 1896 if ((chunk_flags & SCTP_DATA_NOT_FRAG) == SCTP_DATA_NOT_FRAG && 1897 asoc->fragmented_delivery_inprogress == 0 && 1898 TAILQ_EMPTY(&asoc->resetHead) && 1899 ((ordered == 0) || 1900 ((asoc->strmin[strmno].last_sequence_delivered + 1) == strmseq && 1901 TAILQ_EMPTY(&asoc->strmin[strmno].inqueue)))) { 1902 /* Candidate for express delivery */ 1903 /* 1904 * Its not fragmented, No PD-API is up, Nothing in the 1905 * delivery queue, Its un-ordered OR ordered and the next to 1906 * deliver AND nothing else is stuck on the stream queue, 1907 * And there is room for it in the socket buffer. Lets just 1908 * stuff it up the buffer.... 1909 */ 1910 1911 /* It would be nice to avoid this copy if we could :< */ 1912 sctp_alloc_a_readq(stcb, control); 1913 sctp_build_readq_entry_mac(control, stcb, asoc->context, net, tsn, 1914 protocol_id, 1915 stcb->asoc.context, 1916 strmno, strmseq, 1917 chunk_flags, 1918 dmbuf); 1919 if (control == NULL) { 1920 goto failed_express_del; 1921 } 1922 sctp_add_to_readq(stcb->sctp_ep, stcb, 1923 control, &stcb->sctp_socket->so_rcv, 1924 1, SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED); 1925 1926 /* 1927 * EY here I should check if this delivered tsn is 1928 * out_of_order, if yes then update the nr_map 1929 */ 1930 if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && asoc->peer_supports_nr_sack) { 1931 /* 1932 * EY check if the mapping_array and nr_mapping 1933 * array are consistent 1934 */ 1935 if (asoc->mapping_array_base_tsn != asoc->nr_mapping_array_base_tsn) 1936 /* 1937 * printf("EY-IN 1938 * sctp_process_a_data_chunk(5): Something 1939 * is wrong the map base tsn" "\nEY-and 1940 * nr_map base tsn should be equal."); 1941 */ 1942 /* EY debugging block */ 1943 { 1944 /* 1945 * printf("\nEY-Calculating an 1946 * nr_gap!!\nmapping_array_size = %d 1947 * nr_mapping_array_size = %d" 1948 * "\nEY-mapping_array_base = %d 1949 * nr_mapping_array_base = 1950 * %d\nEY-highest_tsn_inside_map = %d" 1951 * "highest_tsn_inside_nr_map = %d\nEY-TSN = 1952 * %d nr_gap = %d",asoc->mapping_array_size, 1953 * asoc->nr_mapping_array_size, 1954 * asoc->mapping_array_base_tsn, 1955 * asoc->nr_mapping_array_base_tsn, 1956 * asoc->highest_tsn_inside_map, 1957 * asoc->highest_tsn_inside_nr_map,tsn,nr_gap 1958 * ); 1959 */ 1960 } 1961 /* EY - not %100 sure about the lock thing */ 1962 SCTP_TCB_LOCK_ASSERT(stcb); 1963 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, nr_gap); 1964 SCTP_REVERSE_OUT_TSN_PRES(nr_gap, tsn, asoc); 1965 if (compare_with_wrap(tsn, asoc->highest_tsn_inside_nr_map, MAX_TSN)) 1966 asoc->highest_tsn_inside_nr_map = tsn; 1967 } 1968 if ((chunk_flags & SCTP_DATA_UNORDERED) == 0) { 1969 /* for ordered, bump what we delivered */ 1970 asoc->strmin[strmno].last_sequence_delivered++; 1971 } 1972 SCTP_STAT_INCR(sctps_recvexpress); 1973 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { 1974 sctp_log_strm_del_alt(stcb, tsn, strmseq, strmno, 1975 SCTP_STR_LOG_FROM_EXPRS_DEL); 1976 } 1977 control = NULL; 1978 goto finish_express_del; 1979 } 1980 failed_express_del: 1981 /* If we reach here this is a new chunk */ 1982 chk = NULL; 1983 control = NULL; 1984 /* Express for fragmented delivery? */ 1985 if ((asoc->fragmented_delivery_inprogress) && 1986 (stcb->asoc.control_pdapi) && 1987 (asoc->str_of_pdapi == strmno) && 1988 (asoc->ssn_of_pdapi == strmseq) 1989 ) { 1990 control = stcb->asoc.control_pdapi; 1991 if ((chunk_flags & SCTP_DATA_FIRST_FRAG) == SCTP_DATA_FIRST_FRAG) { 1992 /* Can't be another first? */ 1993 goto failed_pdapi_express_del; 1994 } 1995 if (tsn == (control->sinfo_tsn + 1)) { 1996 /* Yep, we can add it on */ 1997 int end = 0; 1998 uint32_t cumack; 1999 2000 if (chunk_flags & SCTP_DATA_LAST_FRAG) { 2001 end = 1; 2002 } 2003 cumack = asoc->cumulative_tsn; 2004 if ((cumack + 1) == tsn) 2005 cumack = tsn; 2006 2007 if (sctp_append_to_readq(stcb->sctp_ep, stcb, control, dmbuf, end, 2008 tsn, 2009 &stcb->sctp_socket->so_rcv)) { 2010 SCTP_PRINTF("Append fails end:%d\n", end); 2011 goto failed_pdapi_express_del; 2012 } 2013 /* 2014 * EY It is appended to the read queue in prev if 2015 * block here I should check if this delivered tsn 2016 * is out_of_order, if yes then update the nr_map 2017 */ 2018 if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && asoc->peer_supports_nr_sack) { 2019 /* EY debugging block */ 2020 { 2021 /* 2022 * printf("\nEY-Calculating an 2023 * nr_gap!!\nEY-mapping_array_size = 2024 * %d nr_mapping_array_size = %d" 2025 * "\nEY-mapping_array_base = %d 2026 * nr_mapping_array_base = 2027 * %d\nEY-highest_tsn_inside_map = 2028 * %d" "highest_tsn_inside_nr_map = 2029 * %d\nEY-TSN = %d nr_gap = 2030 * %d",asoc->mapping_array_size, 2031 * asoc->nr_mapping_array_size, 2032 * asoc->mapping_array_base_tsn, 2033 * asoc->nr_mapping_array_base_tsn, 2034 * asoc->highest_tsn_inside_map, 2035 * asoc->highest_tsn_inside_nr_map,ts 2036 * n,nr_gap); 2037 */ 2038 } 2039 /* EY - not %100 sure about the lock thing */ 2040 SCTP_TCB_LOCK_ASSERT(stcb); 2041 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, nr_gap); 2042 SCTP_REVERSE_OUT_TSN_PRES(nr_gap, tsn, asoc); 2043 if (compare_with_wrap(tsn, asoc->highest_tsn_inside_nr_map, MAX_TSN)) 2044 asoc->highest_tsn_inside_nr_map = tsn; 2045 } 2046 SCTP_STAT_INCR(sctps_recvexpressm); 2047 control->sinfo_tsn = tsn; 2048 asoc->tsn_last_delivered = tsn; 2049 asoc->fragment_flags = chunk_flags; 2050 asoc->tsn_of_pdapi_last_delivered = tsn; 2051 asoc->last_flags_delivered = chunk_flags; 2052 asoc->last_strm_seq_delivered = strmseq; 2053 asoc->last_strm_no_delivered = strmno; 2054 if (end) { 2055 /* clean up the flags and such */ 2056 asoc->fragmented_delivery_inprogress = 0; 2057 if ((chunk_flags & SCTP_DATA_UNORDERED) == 0) { 2058 asoc->strmin[strmno].last_sequence_delivered++; 2059 } 2060 stcb->asoc.control_pdapi = NULL; 2061 if (TAILQ_EMPTY(&asoc->reasmqueue) == 0) { 2062 /* 2063 * There could be another message 2064 * ready 2065 */ 2066 need_reasm_check = 1; 2067 } 2068 } 2069 control = NULL; 2070 goto finish_express_del; 2071 } 2072 } 2073 failed_pdapi_express_del: 2074 control = NULL; 2075 if ((chunk_flags & SCTP_DATA_NOT_FRAG) != SCTP_DATA_NOT_FRAG) { 2076 sctp_alloc_a_chunk(stcb, chk); 2077 if (chk == NULL) { 2078 /* No memory so we drop the chunk */ 2079 SCTP_STAT_INCR(sctps_nomem); 2080 if (last_chunk == 0) { 2081 /* we copied it, free the copy */ 2082 sctp_m_freem(dmbuf); 2083 } 2084 return (0); 2085 } 2086 chk->rec.data.TSN_seq = tsn; 2087 chk->no_fr_allowed = 0; 2088 chk->rec.data.stream_seq = strmseq; 2089 chk->rec.data.stream_number = strmno; 2090 chk->rec.data.payloadtype = protocol_id; 2091 chk->rec.data.context = stcb->asoc.context; 2092 chk->rec.data.doing_fast_retransmit = 0; 2093 chk->rec.data.rcv_flags = chunk_flags; 2094 chk->asoc = asoc; 2095 chk->send_size = the_len; 2096 chk->whoTo = net; 2097 atomic_add_int(&net->ref_count, 1); 2098 chk->data = dmbuf; 2099 } else { 2100 sctp_alloc_a_readq(stcb, control); 2101 sctp_build_readq_entry_mac(control, stcb, asoc->context, net, tsn, 2102 protocol_id, 2103 stcb->asoc.context, 2104 strmno, strmseq, 2105 chunk_flags, 2106 dmbuf); 2107 if (control == NULL) { 2108 /* No memory so we drop the chunk */ 2109 SCTP_STAT_INCR(sctps_nomem); 2110 if (last_chunk == 0) { 2111 /* we copied it, free the copy */ 2112 sctp_m_freem(dmbuf); 2113 } 2114 return (0); 2115 } 2116 control->length = the_len; 2117 } 2118 2119 /* Mark it as received */ 2120 /* Now queue it where it belongs */ 2121 if (control != NULL) { 2122 /* First a sanity check */ 2123 if (asoc->fragmented_delivery_inprogress) { 2124 /* 2125 * Ok, we have a fragmented delivery in progress if 2126 * this chunk is next to deliver OR belongs in our 2127 * view to the reassembly, the peer is evil or 2128 * broken. 2129 */ 2130 uint32_t estimate_tsn; 2131 2132 estimate_tsn = asoc->tsn_last_delivered + 1; 2133 if (TAILQ_EMPTY(&asoc->reasmqueue) && 2134 (estimate_tsn == control->sinfo_tsn)) { 2135 /* Evil/Broke peer */ 2136 sctp_m_freem(control->data); 2137 control->data = NULL; 2138 if (control->whoFrom) { 2139 sctp_free_remote_addr(control->whoFrom); 2140 control->whoFrom = NULL; 2141 } 2142 sctp_free_a_readq(stcb, control); 2143 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 2144 0, M_DONTWAIT, 1, MT_DATA); 2145 if (oper) { 2146 struct sctp_paramhdr *ph; 2147 uint32_t *ippp; 2148 2149 SCTP_BUF_LEN(oper) = 2150 sizeof(struct sctp_paramhdr) + 2151 (3 * sizeof(uint32_t)); 2152 ph = mtod(oper, struct sctp_paramhdr *); 2153 ph->param_type = 2154 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 2155 ph->param_length = htons(SCTP_BUF_LEN(oper)); 2156 ippp = (uint32_t *) (ph + 1); 2157 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_15); 2158 ippp++; 2159 *ippp = tsn; 2160 ippp++; 2161 *ippp = ((strmno << 16) | strmseq); 2162 } 2163 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_15; 2164 sctp_abort_an_association(stcb->sctp_ep, stcb, 2165 SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); 2166 2167 *abort_flag = 1; 2168 return (0); 2169 } else { 2170 if (sctp_does_tsn_belong_to_reasm(asoc, control->sinfo_tsn)) { 2171 sctp_m_freem(control->data); 2172 control->data = NULL; 2173 if (control->whoFrom) { 2174 sctp_free_remote_addr(control->whoFrom); 2175 control->whoFrom = NULL; 2176 } 2177 sctp_free_a_readq(stcb, control); 2178 2179 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 2180 0, M_DONTWAIT, 1, MT_DATA); 2181 if (oper) { 2182 struct sctp_paramhdr *ph; 2183 uint32_t *ippp; 2184 2185 SCTP_BUF_LEN(oper) = 2186 sizeof(struct sctp_paramhdr) + 2187 (3 * sizeof(uint32_t)); 2188 ph = mtod(oper, 2189 struct sctp_paramhdr *); 2190 ph->param_type = 2191 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 2192 ph->param_length = 2193 htons(SCTP_BUF_LEN(oper)); 2194 ippp = (uint32_t *) (ph + 1); 2195 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_16); 2196 ippp++; 2197 *ippp = tsn; 2198 ippp++; 2199 *ippp = ((strmno << 16) | strmseq); 2200 } 2201 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_16; 2202 sctp_abort_an_association(stcb->sctp_ep, 2203 stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); 2204 2205 *abort_flag = 1; 2206 return (0); 2207 } 2208 } 2209 } else { 2210 /* No PDAPI running */ 2211 if (!TAILQ_EMPTY(&asoc->reasmqueue)) { 2212 /* 2213 * Reassembly queue is NOT empty validate 2214 * that this tsn does not need to be in 2215 * reasembly queue. If it does then our peer 2216 * is broken or evil. 2217 */ 2218 if (sctp_does_tsn_belong_to_reasm(asoc, control->sinfo_tsn)) { 2219 sctp_m_freem(control->data); 2220 control->data = NULL; 2221 if (control->whoFrom) { 2222 sctp_free_remote_addr(control->whoFrom); 2223 control->whoFrom = NULL; 2224 } 2225 sctp_free_a_readq(stcb, control); 2226 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 2227 0, M_DONTWAIT, 1, MT_DATA); 2228 if (oper) { 2229 struct sctp_paramhdr *ph; 2230 uint32_t *ippp; 2231 2232 SCTP_BUF_LEN(oper) = 2233 sizeof(struct sctp_paramhdr) + 2234 (3 * sizeof(uint32_t)); 2235 ph = mtod(oper, 2236 struct sctp_paramhdr *); 2237 ph->param_type = 2238 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 2239 ph->param_length = 2240 htons(SCTP_BUF_LEN(oper)); 2241 ippp = (uint32_t *) (ph + 1); 2242 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_17); 2243 ippp++; 2244 *ippp = tsn; 2245 ippp++; 2246 *ippp = ((strmno << 16) | strmseq); 2247 } 2248 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_17; 2249 sctp_abort_an_association(stcb->sctp_ep, 2250 stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); 2251 2252 *abort_flag = 1; 2253 return (0); 2254 } 2255 } 2256 } 2257 /* ok, if we reach here we have passed the sanity checks */ 2258 if (chunk_flags & SCTP_DATA_UNORDERED) { 2259 /* queue directly into socket buffer */ 2260 sctp_add_to_readq(stcb->sctp_ep, stcb, 2261 control, 2262 &stcb->sctp_socket->so_rcv, 1, SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED); 2263 2264 /* 2265 * EY It is added to the read queue in prev if block 2266 * here I should check if this delivered tsn is 2267 * out_of_order, if yes then update the nr_map 2268 */ 2269 if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && asoc->peer_supports_nr_sack) { 2270 /* 2271 * EY check if the mapping_array and 2272 * nr_mapping array are consistent 2273 */ 2274 if (asoc->mapping_array_base_tsn != asoc->nr_mapping_array_base_tsn) 2275 /* 2276 * printf("EY-IN 2277 * sctp_process_a_data_chunk(6): 2278 * Something is wrong the map base 2279 * tsn" "\nEY-and nr_map base tsn 2280 * should be equal."); 2281 */ 2282 /* 2283 * EY - not %100 sure about the lock 2284 * thing, i think we don't need the 2285 * below, 2286 */ 2287 /* SCTP_TCB_LOCK_ASSERT(stcb); */ 2288 { 2289 /* 2290 * printf("\nEY-Calculating an 2291 * nr_gap!!\nEY-mapping_array_size = 2292 * %d nr_mapping_array_size = %d" 2293 * "\nEY-mapping_array_base = %d 2294 * nr_mapping_array_base = 2295 * %d\nEY-highest_tsn_inside_map = 2296 * %d" "highest_tsn_inside_nr_map = 2297 * %d\nEY-TSN = %d nr_gap = 2298 * %d",asoc->mapping_array_size, 2299 * asoc->nr_mapping_array_size, 2300 * asoc->mapping_array_base_tsn, 2301 * asoc->nr_mapping_array_base_tsn, 2302 * asoc->highest_tsn_inside_map, 2303 * asoc->highest_tsn_inside_nr_map,ts 2304 * n,nr_gap); 2305 */ 2306 } 2307 SCTP_TCB_LOCK_ASSERT(stcb); 2308 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, nr_gap); 2309 SCTP_REVERSE_OUT_TSN_PRES(nr_gap, tsn, asoc); 2310 if (compare_with_wrap(tsn, asoc->highest_tsn_inside_nr_map, MAX_TSN)) 2311 asoc->highest_tsn_inside_nr_map = tsn; 2312 } 2313 } else { 2314 /* 2315 * Special check for when streams are resetting. We 2316 * could be more smart about this and check the 2317 * actual stream to see if it is not being reset.. 2318 * that way we would not create a HOLB when amongst 2319 * streams being reset and those not being reset. 2320 * 2321 * We take complete messages that have a stream reset 2322 * intervening (aka the TSN is after where our 2323 * cum-ack needs to be) off and put them on a 2324 * pending_reply_queue. The reassembly ones we do 2325 * not have to worry about since they are all sorted 2326 * and proceessed by TSN order. It is only the 2327 * singletons I must worry about. 2328 */ 2329 if (((liste = TAILQ_FIRST(&asoc->resetHead)) != NULL) && 2330 ((compare_with_wrap(tsn, liste->tsn, MAX_TSN))) 2331 ) { 2332 /* 2333 * yep its past where we need to reset... go 2334 * ahead and queue it. 2335 */ 2336 if (TAILQ_EMPTY(&asoc->pending_reply_queue)) { 2337 /* first one on */ 2338 TAILQ_INSERT_TAIL(&asoc->pending_reply_queue, control, next); 2339 } else { 2340 struct sctp_queued_to_read *ctlOn; 2341 unsigned char inserted = 0; 2342 2343 ctlOn = TAILQ_FIRST(&asoc->pending_reply_queue); 2344 while (ctlOn) { 2345 if (compare_with_wrap(control->sinfo_tsn, 2346 ctlOn->sinfo_tsn, MAX_TSN)) { 2347 ctlOn = TAILQ_NEXT(ctlOn, next); 2348 } else { 2349 /* found it */ 2350 TAILQ_INSERT_BEFORE(ctlOn, control, next); 2351 inserted = 1; 2352 break; 2353 } 2354 } 2355 if (inserted == 0) { 2356 /* 2357 * must be put at end, use 2358 * prevP (all setup from 2359 * loop) to setup nextP. 2360 */ 2361 TAILQ_INSERT_TAIL(&asoc->pending_reply_queue, control, next); 2362 } 2363 } 2364 } else { 2365 sctp_queue_data_to_stream(stcb, asoc, control, abort_flag); 2366 if (*abort_flag) { 2367 return (0); 2368 } 2369 } 2370 } 2371 } else { 2372 /* Into the re-assembly queue */ 2373 sctp_queue_data_for_reasm(stcb, asoc, chk, abort_flag); 2374 if (*abort_flag) { 2375 /* 2376 * the assoc is now gone and chk was put onto the 2377 * reasm queue, which has all been freed. 2378 */ 2379 *m = NULL; 2380 return (0); 2381 } 2382 } 2383 finish_express_del: 2384 if (compare_with_wrap(tsn, asoc->highest_tsn_inside_map, MAX_TSN)) { 2385 /* we have a new high score */ 2386 asoc->highest_tsn_inside_map = tsn; 2387 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 2388 sctp_log_map(0, 2, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 2389 } 2390 } 2391 if (tsn == (asoc->cumulative_tsn + 1)) { 2392 /* Update cum-ack */ 2393 asoc->cumulative_tsn = tsn; 2394 } 2395 if (last_chunk) { 2396 *m = NULL; 2397 } 2398 if (ordered) { 2399 SCTP_STAT_INCR_COUNTER64(sctps_inorderchunks); 2400 } else { 2401 SCTP_STAT_INCR_COUNTER64(sctps_inunorderchunks); 2402 } 2403 SCTP_STAT_INCR(sctps_recvdata); 2404 /* Set it present please */ 2405 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { 2406 sctp_log_strm_del_alt(stcb, tsn, strmseq, strmno, SCTP_STR_LOG_FROM_MARK_TSN); 2407 } 2408 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 2409 sctp_log_map(asoc->mapping_array_base_tsn, asoc->cumulative_tsn, 2410 asoc->highest_tsn_inside_map, SCTP_MAP_PREPARE_SLIDE); 2411 } 2412 SCTP_TCB_LOCK_ASSERT(stcb); 2413 SCTP_SET_TSN_PRESENT(asoc->mapping_array, gap); 2414 2415 if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && 2416 asoc->peer_supports_nr_sack && 2417 (SCTP_BASE_SYSCTL(sctp_do_drain) == 0)) { 2418 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap); 2419 SCTP_REVERSE_OUT_TSN_PRES(nr_gap, tsn, asoc); 2420 if (compare_with_wrap(tsn, asoc->highest_tsn_inside_nr_map, MAX_TSN)) { 2421 asoc->highest_tsn_inside_nr_map = tsn; 2422 } 2423 } 2424 /* check the special flag for stream resets */ 2425 if (((liste = TAILQ_FIRST(&asoc->resetHead)) != NULL) && 2426 ((compare_with_wrap(asoc->cumulative_tsn, liste->tsn, MAX_TSN)) || 2427 (asoc->cumulative_tsn == liste->tsn)) 2428 ) { 2429 /* 2430 * we have finished working through the backlogged TSN's now 2431 * time to reset streams. 1: call reset function. 2: free 2432 * pending_reply space 3: distribute any chunks in 2433 * pending_reply_queue. 2434 */ 2435 struct sctp_queued_to_read *ctl; 2436 2437 sctp_reset_in_stream(stcb, liste->number_entries, liste->req.list_of_streams); 2438 TAILQ_REMOVE(&asoc->resetHead, liste, next_resp); 2439 SCTP_FREE(liste, SCTP_M_STRESET); 2440 /* sa_ignore FREED_MEMORY */ 2441 liste = TAILQ_FIRST(&asoc->resetHead); 2442 ctl = TAILQ_FIRST(&asoc->pending_reply_queue); 2443 if (ctl && (liste == NULL)) { 2444 /* All can be removed */ 2445 while (ctl) { 2446 TAILQ_REMOVE(&asoc->pending_reply_queue, ctl, next); 2447 sctp_queue_data_to_stream(stcb, asoc, ctl, abort_flag); 2448 if (*abort_flag) { 2449 return (0); 2450 } 2451 ctl = TAILQ_FIRST(&asoc->pending_reply_queue); 2452 } 2453 } else if (ctl) { 2454 /* more than one in queue */ 2455 while (!compare_with_wrap(ctl->sinfo_tsn, liste->tsn, MAX_TSN)) { 2456 /* 2457 * if ctl->sinfo_tsn is <= liste->tsn we can 2458 * process it which is the NOT of 2459 * ctl->sinfo_tsn > liste->tsn 2460 */ 2461 TAILQ_REMOVE(&asoc->pending_reply_queue, ctl, next); 2462 sctp_queue_data_to_stream(stcb, asoc, ctl, abort_flag); 2463 if (*abort_flag) { 2464 return (0); 2465 } 2466 ctl = TAILQ_FIRST(&asoc->pending_reply_queue); 2467 } 2468 } 2469 /* 2470 * Now service re-assembly to pick up anything that has been 2471 * held on reassembly queue? 2472 */ 2473 sctp_deliver_reasm_check(stcb, asoc); 2474 need_reasm_check = 0; 2475 } 2476 if (need_reasm_check) { 2477 /* Another one waits ? */ 2478 sctp_deliver_reasm_check(stcb, asoc); 2479 } 2480 return (1); 2481 } 2482 2483 int8_t sctp_map_lookup_tab[256] = { 2484 -1, 0, -1, 1, -1, 0, -1, 2, 2485 -1, 0, -1, 1, -1, 0, -1, 3, 2486 -1, 0, -1, 1, -1, 0, -1, 2, 2487 -1, 0, -1, 1, -1, 0, -1, 4, 2488 -1, 0, -1, 1, -1, 0, -1, 2, 2489 -1, 0, -1, 1, -1, 0, -1, 3, 2490 -1, 0, -1, 1, -1, 0, -1, 2, 2491 -1, 0, -1, 1, -1, 0, -1, 5, 2492 -1, 0, -1, 1, -1, 0, -1, 2, 2493 -1, 0, -1, 1, -1, 0, -1, 3, 2494 -1, 0, -1, 1, -1, 0, -1, 2, 2495 -1, 0, -1, 1, -1, 0, -1, 4, 2496 -1, 0, -1, 1, -1, 0, -1, 2, 2497 -1, 0, -1, 1, -1, 0, -1, 3, 2498 -1, 0, -1, 1, -1, 0, -1, 2, 2499 -1, 0, -1, 1, -1, 0, -1, 6, 2500 -1, 0, -1, 1, -1, 0, -1, 2, 2501 -1, 0, -1, 1, -1, 0, -1, 3, 2502 -1, 0, -1, 1, -1, 0, -1, 2, 2503 -1, 0, -1, 1, -1, 0, -1, 4, 2504 -1, 0, -1, 1, -1, 0, -1, 2, 2505 -1, 0, -1, 1, -1, 0, -1, 3, 2506 -1, 0, -1, 1, -1, 0, -1, 2, 2507 -1, 0, -1, 1, -1, 0, -1, 5, 2508 -1, 0, -1, 1, -1, 0, -1, 2, 2509 -1, 0, -1, 1, -1, 0, -1, 3, 2510 -1, 0, -1, 1, -1, 0, -1, 2, 2511 -1, 0, -1, 1, -1, 0, -1, 4, 2512 -1, 0, -1, 1, -1, 0, -1, 2, 2513 -1, 0, -1, 1, -1, 0, -1, 3, 2514 -1, 0, -1, 1, -1, 0, -1, 2, 2515 -1, 0, -1, 1, -1, 0, -1, 7, 2516 }; 2517 2518 2519 void 2520 sctp_sack_check(struct sctp_tcb *stcb, int ok_to_sack, int was_a_gap, int *abort_flag) 2521 { 2522 /* 2523 * Now we also need to check the mapping array in a couple of ways. 2524 * 1) Did we move the cum-ack point? 2525 */ 2526 struct sctp_association *asoc; 2527 int at; 2528 int last_all_ones = 0; 2529 int slide_from, slide_end, lgap, distance; 2530 2531 /* EY nr_mapping array variables */ 2532 /* int nr_at; */ 2533 /* int nr_last_all_ones = 0; */ 2534 /* int nr_slide_from, nr_slide_end, nr_lgap, nr_distance; */ 2535 2536 uint32_t old_cumack, old_base, old_highest; 2537 unsigned char aux_array[64]; 2538 2539 /* 2540 * EY! Don't think this is required but I am immitating the code for 2541 * map just to make sure 2542 */ 2543 unsigned char nr_aux_array[64]; 2544 2545 asoc = &stcb->asoc; 2546 at = 0; 2547 2548 old_cumack = asoc->cumulative_tsn; 2549 old_base = asoc->mapping_array_base_tsn; 2550 old_highest = asoc->highest_tsn_inside_map; 2551 if (asoc->mapping_array_size < 64) 2552 memcpy(aux_array, asoc->mapping_array, 2553 asoc->mapping_array_size); 2554 else 2555 memcpy(aux_array, asoc->mapping_array, 64); 2556 /* EY do the same for nr_mapping_array */ 2557 if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && asoc->peer_supports_nr_sack) { 2558 2559 if (asoc->nr_mapping_array_size != asoc->mapping_array_size) { 2560 /* 2561 * printf("\nEY-IN sack_check method: \nEY-" "The 2562 * size of map and nr_map are inconsitent") 2563 */ ; 2564 } 2565 if (asoc->nr_mapping_array_base_tsn != asoc->mapping_array_base_tsn) { 2566 /* 2567 * printf("\nEY-IN sack_check method VERY CRUCIAL 2568 * error: \nEY-" "The base tsns of map and nr_map 2569 * are inconsitent") 2570 */ ; 2571 } 2572 /* EY! just immitating the above code */ 2573 if (asoc->nr_mapping_array_size < 64) 2574 memcpy(nr_aux_array, asoc->nr_mapping_array, 2575 asoc->nr_mapping_array_size); 2576 else 2577 memcpy(aux_array, asoc->nr_mapping_array, 64); 2578 } 2579 /* 2580 * We could probably improve this a small bit by calculating the 2581 * offset of the current cum-ack as the starting point. 2582 */ 2583 at = 0; 2584 for (slide_from = 0; slide_from < stcb->asoc.mapping_array_size; slide_from++) { 2585 2586 if (asoc->mapping_array[slide_from] == 0xff) { 2587 at += 8; 2588 last_all_ones = 1; 2589 } else { 2590 /* there is a 0 bit */ 2591 at += sctp_map_lookup_tab[asoc->mapping_array[slide_from]]; 2592 last_all_ones = 0; 2593 break; 2594 } 2595 } 2596 asoc->cumulative_tsn = asoc->mapping_array_base_tsn + (at - last_all_ones); 2597 /* at is one off, since in the table a embedded -1 is present */ 2598 at++; 2599 2600 if (compare_with_wrap(asoc->cumulative_tsn, 2601 asoc->highest_tsn_inside_map, 2602 MAX_TSN)) { 2603 #ifdef INVARIANTS 2604 panic("huh, cumack 0x%x greater than high-tsn 0x%x in map", 2605 asoc->cumulative_tsn, asoc->highest_tsn_inside_map); 2606 #else 2607 SCTP_PRINTF("huh, cumack 0x%x greater than high-tsn 0x%x in map - should panic?\n", 2608 asoc->cumulative_tsn, asoc->highest_tsn_inside_map); 2609 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 2610 sctp_log_map(0, 6, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 2611 } 2612 asoc->highest_tsn_inside_map = asoc->cumulative_tsn; 2613 asoc->highest_tsn_inside_nr_map = asoc->cumulative_tsn; 2614 #endif 2615 } 2616 if ((asoc->cumulative_tsn == asoc->highest_tsn_inside_map) && (at >= 8)) { 2617 /* The complete array was completed by a single FR */ 2618 /* higest becomes the cum-ack */ 2619 int clr; 2620 2621 asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 2622 /* clear the array */ 2623 clr = (at >> 3) + 1; 2624 if (clr > asoc->mapping_array_size) { 2625 clr = asoc->mapping_array_size; 2626 } 2627 memset(asoc->mapping_array, 0, clr); 2628 /* base becomes one ahead of the cum-ack */ 2629 asoc->mapping_array_base_tsn = asoc->cumulative_tsn + 1; 2630 2631 if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && asoc->peer_supports_nr_sack) { 2632 2633 if (clr > asoc->nr_mapping_array_size) 2634 clr = asoc->nr_mapping_array_size; 2635 2636 memset(asoc->nr_mapping_array, 0, clr); 2637 /* base becomes one ahead of the cum-ack */ 2638 asoc->nr_mapping_array_base_tsn = asoc->cumulative_tsn + 1; 2639 asoc->highest_tsn_inside_nr_map = asoc->cumulative_tsn; 2640 } 2641 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 2642 sctp_log_map(old_base, old_cumack, old_highest, 2643 SCTP_MAP_PREPARE_SLIDE); 2644 sctp_log_map(asoc->mapping_array_base_tsn, asoc->cumulative_tsn, 2645 asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_CLEARED); 2646 } 2647 } else if (at >= 8) { 2648 /* we can slide the mapping array down */ 2649 /* slide_from holds where we hit the first NON 0xff byte */ 2650 2651 /* 2652 * now calculate the ceiling of the move using our highest 2653 * TSN value 2654 */ 2655 if (asoc->highest_tsn_inside_map >= asoc->mapping_array_base_tsn) { 2656 lgap = asoc->highest_tsn_inside_map - 2657 asoc->mapping_array_base_tsn; 2658 } else { 2659 lgap = (MAX_TSN - asoc->mapping_array_base_tsn) + 2660 asoc->highest_tsn_inside_map + 1; 2661 } 2662 slide_end = lgap >> 3; 2663 if (slide_end < slide_from) { 2664 #ifdef INVARIANTS 2665 panic("impossible slide"); 2666 #else 2667 printf("impossible slide?\n"); 2668 return; 2669 #endif 2670 } 2671 if (slide_end > asoc->mapping_array_size) { 2672 #ifdef INVARIANTS 2673 panic("would overrun buffer"); 2674 #else 2675 printf("Gak, would have overrun map end:%d slide_end:%d\n", 2676 asoc->mapping_array_size, slide_end); 2677 slide_end = asoc->mapping_array_size; 2678 #endif 2679 } 2680 distance = (slide_end - slide_from) + 1; 2681 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 2682 sctp_log_map(old_base, old_cumack, old_highest, 2683 SCTP_MAP_PREPARE_SLIDE); 2684 sctp_log_map((uint32_t) slide_from, (uint32_t) slide_end, 2685 (uint32_t) lgap, SCTP_MAP_SLIDE_FROM); 2686 } 2687 if (distance + slide_from > asoc->mapping_array_size || 2688 distance < 0) { 2689 /* 2690 * Here we do NOT slide forward the array so that 2691 * hopefully when more data comes in to fill it up 2692 * we will be able to slide it forward. Really I 2693 * don't think this should happen :-0 2694 */ 2695 2696 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 2697 sctp_log_map((uint32_t) distance, (uint32_t) slide_from, 2698 (uint32_t) asoc->mapping_array_size, 2699 SCTP_MAP_SLIDE_NONE); 2700 } 2701 } else { 2702 int ii; 2703 2704 for (ii = 0; ii < distance; ii++) { 2705 asoc->mapping_array[ii] = 2706 asoc->mapping_array[slide_from + ii]; 2707 } 2708 for (ii = distance; ii <= slide_end; ii++) { 2709 asoc->mapping_array[ii] = 0; 2710 } 2711 asoc->mapping_array_base_tsn += (slide_from << 3); 2712 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 2713 sctp_log_map(asoc->mapping_array_base_tsn, 2714 asoc->cumulative_tsn, asoc->highest_tsn_inside_map, 2715 SCTP_MAP_SLIDE_RESULT); 2716 } 2717 /* 2718 * EY if doing nr_sacks then slide the 2719 * nr_mapping_array accordingly please 2720 */ 2721 if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && asoc->peer_supports_nr_sack) { 2722 for (ii = 0; ii < distance; ii++) { 2723 asoc->nr_mapping_array[ii] = 2724 asoc->nr_mapping_array[slide_from + ii]; 2725 } 2726 for (ii = distance; ii <= slide_end; ii++) { 2727 asoc->nr_mapping_array[ii] = 0; 2728 } 2729 asoc->nr_mapping_array_base_tsn += (slide_from << 3); 2730 } 2731 } 2732 } 2733 /* 2734 * Now we need to see if we need to queue a sack or just start the 2735 * timer (if allowed). 2736 */ 2737 if (ok_to_sack) { 2738 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 2739 /* 2740 * Ok special case, in SHUTDOWN-SENT case. here we 2741 * maker sure SACK timer is off and instead send a 2742 * SHUTDOWN and a SACK 2743 */ 2744 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) { 2745 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, 2746 stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_INDATA + SCTP_LOC_18); 2747 } 2748 sctp_send_shutdown(stcb, stcb->asoc.primary_destination); 2749 /* 2750 * EY if nr_sacks used then send an nr-sack , a sack 2751 * otherwise 2752 */ 2753 if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && stcb->asoc.peer_supports_nr_sack) 2754 sctp_send_nr_sack(stcb); 2755 else 2756 sctp_send_sack(stcb); 2757 } else { 2758 int is_a_gap; 2759 2760 /* is there a gap now ? */ 2761 is_a_gap = compare_with_wrap(stcb->asoc.highest_tsn_inside_map, 2762 stcb->asoc.cumulative_tsn, MAX_TSN); 2763 2764 /* 2765 * CMT DAC algorithm: increase number of packets 2766 * received since last ack 2767 */ 2768 stcb->asoc.cmt_dac_pkts_rcvd++; 2769 2770 if ((stcb->asoc.send_sack == 1) || /* We need to send a 2771 * SACK */ 2772 ((was_a_gap) && (is_a_gap == 0)) || /* was a gap, but no 2773 * longer is one */ 2774 (stcb->asoc.numduptsns) || /* we have dup's */ 2775 (is_a_gap) || /* is still a gap */ 2776 (stcb->asoc.delayed_ack == 0) || /* Delayed sack disabled */ 2777 (stcb->asoc.data_pkts_seen >= stcb->asoc.sack_freq) /* hit limit of pkts */ 2778 ) { 2779 2780 if ((SCTP_BASE_SYSCTL(sctp_cmt_on_off)) && 2781 (SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) && 2782 (stcb->asoc.send_sack == 0) && 2783 (stcb->asoc.numduptsns == 0) && 2784 (stcb->asoc.delayed_ack) && 2785 (!SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer))) { 2786 2787 /* 2788 * CMT DAC algorithm: With CMT, 2789 * delay acks even in the face of 2790 * 2791 * reordering. Therefore, if acks that 2792 * do not have to be sent because of 2793 * the above reasons, will be 2794 * delayed. That is, acks that would 2795 * have been sent due to gap reports 2796 * will be delayed with DAC. Start 2797 * the delayed ack timer. 2798 */ 2799 sctp_timer_start(SCTP_TIMER_TYPE_RECV, 2800 stcb->sctp_ep, stcb, NULL); 2801 } else { 2802 /* 2803 * Ok we must build a SACK since the 2804 * timer is pending, we got our 2805 * first packet OR there are gaps or 2806 * duplicates. 2807 */ 2808 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer); 2809 /* 2810 * EY if nr_sacks used then send an 2811 * nr-sack , a sack otherwise 2812 */ 2813 if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && stcb->asoc.peer_supports_nr_sack) 2814 sctp_send_nr_sack(stcb); 2815 else 2816 sctp_send_sack(stcb); 2817 } 2818 } else { 2819 if (!SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) { 2820 sctp_timer_start(SCTP_TIMER_TYPE_RECV, 2821 stcb->sctp_ep, stcb, NULL); 2822 } 2823 } 2824 } 2825 } 2826 } 2827 2828 void 2829 sctp_service_queues(struct sctp_tcb *stcb, struct sctp_association *asoc) 2830 { 2831 struct sctp_tmit_chunk *chk; 2832 uint32_t tsize, pd_point; 2833 uint16_t nxt_todel; 2834 2835 if (asoc->fragmented_delivery_inprogress) { 2836 sctp_service_reassembly(stcb, asoc); 2837 } 2838 /* Can we proceed further, i.e. the PD-API is complete */ 2839 if (asoc->fragmented_delivery_inprogress) { 2840 /* no */ 2841 return; 2842 } 2843 /* 2844 * Now is there some other chunk I can deliver from the reassembly 2845 * queue. 2846 */ 2847 doit_again: 2848 chk = TAILQ_FIRST(&asoc->reasmqueue); 2849 if (chk == NULL) { 2850 asoc->size_on_reasm_queue = 0; 2851 asoc->cnt_on_reasm_queue = 0; 2852 return; 2853 } 2854 nxt_todel = asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered + 1; 2855 if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) && 2856 ((nxt_todel == chk->rec.data.stream_seq) || 2857 (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED))) { 2858 /* 2859 * Yep the first one is here. We setup to start reception, 2860 * by backing down the TSN just in case we can't deliver. 2861 */ 2862 2863 /* 2864 * Before we start though either all of the message should 2865 * be here or 1/4 the socket buffer max or nothing on the 2866 * delivery queue and something can be delivered. 2867 */ 2868 if (stcb->sctp_socket) { 2869 pd_point = min(SCTP_SB_LIMIT_RCV(stcb->sctp_socket) >> SCTP_PARTIAL_DELIVERY_SHIFT, 2870 stcb->sctp_ep->partial_delivery_point); 2871 } else { 2872 pd_point = stcb->sctp_ep->partial_delivery_point; 2873 } 2874 if (sctp_is_all_msg_on_reasm(asoc, &tsize) || (tsize >= pd_point)) { 2875 asoc->fragmented_delivery_inprogress = 1; 2876 asoc->tsn_last_delivered = chk->rec.data.TSN_seq - 1; 2877 asoc->str_of_pdapi = chk->rec.data.stream_number; 2878 asoc->ssn_of_pdapi = chk->rec.data.stream_seq; 2879 asoc->pdapi_ppid = chk->rec.data.payloadtype; 2880 asoc->fragment_flags = chk->rec.data.rcv_flags; 2881 sctp_service_reassembly(stcb, asoc); 2882 if (asoc->fragmented_delivery_inprogress == 0) { 2883 goto doit_again; 2884 } 2885 } 2886 } 2887 } 2888 2889 int 2890 sctp_process_data(struct mbuf **mm, int iphlen, int *offset, int length, 2891 struct sctphdr *sh, struct sctp_inpcb *inp, struct sctp_tcb *stcb, 2892 struct sctp_nets *net, uint32_t * high_tsn) 2893 { 2894 struct sctp_data_chunk *ch, chunk_buf; 2895 struct sctp_association *asoc; 2896 int num_chunks = 0; /* number of control chunks processed */ 2897 int stop_proc = 0; 2898 int chk_length, break_flag, last_chunk; 2899 int abort_flag = 0, was_a_gap = 0; 2900 struct mbuf *m; 2901 2902 /* set the rwnd */ 2903 sctp_set_rwnd(stcb, &stcb->asoc); 2904 2905 m = *mm; 2906 SCTP_TCB_LOCK_ASSERT(stcb); 2907 asoc = &stcb->asoc; 2908 if (compare_with_wrap(stcb->asoc.highest_tsn_inside_map, 2909 stcb->asoc.cumulative_tsn, MAX_TSN)) { 2910 /* there was a gap before this data was processed */ 2911 was_a_gap = 1; 2912 } 2913 /* 2914 * setup where we got the last DATA packet from for any SACK that 2915 * may need to go out. Don't bump the net. This is done ONLY when a 2916 * chunk is assigned. 2917 */ 2918 asoc->last_data_chunk_from = net; 2919 2920 /*- 2921 * Now before we proceed we must figure out if this is a wasted 2922 * cluster... i.e. it is a small packet sent in and yet the driver 2923 * underneath allocated a full cluster for it. If so we must copy it 2924 * to a smaller mbuf and free up the cluster mbuf. This will help 2925 * with cluster starvation. Note for __Panda__ we don't do this 2926 * since it has clusters all the way down to 64 bytes. 2927 */ 2928 if (SCTP_BUF_LEN(m) < (long)MLEN && SCTP_BUF_NEXT(m) == NULL) { 2929 /* we only handle mbufs that are singletons.. not chains */ 2930 m = sctp_get_mbuf_for_msg(SCTP_BUF_LEN(m), 0, M_DONTWAIT, 1, MT_DATA); 2931 if (m) { 2932 /* ok lets see if we can copy the data up */ 2933 caddr_t *from, *to; 2934 2935 /* get the pointers and copy */ 2936 to = mtod(m, caddr_t *); 2937 from = mtod((*mm), caddr_t *); 2938 memcpy(to, from, SCTP_BUF_LEN((*mm))); 2939 /* copy the length and free up the old */ 2940 SCTP_BUF_LEN(m) = SCTP_BUF_LEN((*mm)); 2941 sctp_m_freem(*mm); 2942 /* sucess, back copy */ 2943 *mm = m; 2944 } else { 2945 /* We are in trouble in the mbuf world .. yikes */ 2946 m = *mm; 2947 } 2948 } 2949 /* get pointer to the first chunk header */ 2950 ch = (struct sctp_data_chunk *)sctp_m_getptr(m, *offset, 2951 sizeof(struct sctp_data_chunk), (uint8_t *) & chunk_buf); 2952 if (ch == NULL) { 2953 return (1); 2954 } 2955 /* 2956 * process all DATA chunks... 2957 */ 2958 *high_tsn = asoc->cumulative_tsn; 2959 break_flag = 0; 2960 asoc->data_pkts_seen++; 2961 while (stop_proc == 0) { 2962 /* validate chunk length */ 2963 chk_length = ntohs(ch->ch.chunk_length); 2964 if (length - *offset < chk_length) { 2965 /* all done, mutulated chunk */ 2966 stop_proc = 1; 2967 break; 2968 } 2969 if (ch->ch.chunk_type == SCTP_DATA) { 2970 if ((size_t)chk_length < sizeof(struct sctp_data_chunk) + 1) { 2971 /* 2972 * Need to send an abort since we had a 2973 * invalid data chunk. 2974 */ 2975 struct mbuf *op_err; 2976 2977 op_err = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 2 * sizeof(uint32_t)), 2978 0, M_DONTWAIT, 1, MT_DATA); 2979 2980 if (op_err) { 2981 struct sctp_paramhdr *ph; 2982 uint32_t *ippp; 2983 2984 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr) + 2985 (2 * sizeof(uint32_t)); 2986 ph = mtod(op_err, struct sctp_paramhdr *); 2987 ph->param_type = 2988 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 2989 ph->param_length = htons(SCTP_BUF_LEN(op_err)); 2990 ippp = (uint32_t *) (ph + 1); 2991 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_19); 2992 ippp++; 2993 *ippp = asoc->cumulative_tsn; 2994 2995 } 2996 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_19; 2997 sctp_abort_association(inp, stcb, m, iphlen, sh, 2998 op_err, 0, net->port); 2999 return (2); 3000 } 3001 #ifdef SCTP_AUDITING_ENABLED 3002 sctp_audit_log(0xB1, 0); 3003 #endif 3004 if (SCTP_SIZE32(chk_length) == (length - *offset)) { 3005 last_chunk = 1; 3006 } else { 3007 last_chunk = 0; 3008 } 3009 if (sctp_process_a_data_chunk(stcb, asoc, mm, *offset, ch, 3010 chk_length, net, high_tsn, &abort_flag, &break_flag, 3011 last_chunk)) { 3012 num_chunks++; 3013 } 3014 if (abort_flag) 3015 return (2); 3016 3017 if (break_flag) { 3018 /* 3019 * Set because of out of rwnd space and no 3020 * drop rep space left. 3021 */ 3022 stop_proc = 1; 3023 break; 3024 } 3025 } else { 3026 /* not a data chunk in the data region */ 3027 switch (ch->ch.chunk_type) { 3028 case SCTP_INITIATION: 3029 case SCTP_INITIATION_ACK: 3030 case SCTP_SELECTIVE_ACK: 3031 case SCTP_NR_SELECTIVE_ACK: /* EY */ 3032 case SCTP_HEARTBEAT_REQUEST: 3033 case SCTP_HEARTBEAT_ACK: 3034 case SCTP_ABORT_ASSOCIATION: 3035 case SCTP_SHUTDOWN: 3036 case SCTP_SHUTDOWN_ACK: 3037 case SCTP_OPERATION_ERROR: 3038 case SCTP_COOKIE_ECHO: 3039 case SCTP_COOKIE_ACK: 3040 case SCTP_ECN_ECHO: 3041 case SCTP_ECN_CWR: 3042 case SCTP_SHUTDOWN_COMPLETE: 3043 case SCTP_AUTHENTICATION: 3044 case SCTP_ASCONF_ACK: 3045 case SCTP_PACKET_DROPPED: 3046 case SCTP_STREAM_RESET: 3047 case SCTP_FORWARD_CUM_TSN: 3048 case SCTP_ASCONF: 3049 /* 3050 * Now, what do we do with KNOWN chunks that 3051 * are NOT in the right place? 3052 * 3053 * For now, I do nothing but ignore them. We 3054 * may later want to add sysctl stuff to 3055 * switch out and do either an ABORT() or 3056 * possibly process them. 3057 */ 3058 if (SCTP_BASE_SYSCTL(sctp_strict_data_order)) { 3059 struct mbuf *op_err; 3060 3061 op_err = sctp_generate_invmanparam(SCTP_CAUSE_PROTOCOL_VIOLATION); 3062 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 0, net->port); 3063 return (2); 3064 } 3065 break; 3066 default: 3067 /* unknown chunk type, use bit rules */ 3068 if (ch->ch.chunk_type & 0x40) { 3069 /* Add a error report to the queue */ 3070 struct mbuf *merr; 3071 struct sctp_paramhdr *phd; 3072 3073 merr = sctp_get_mbuf_for_msg(sizeof(*phd), 0, M_DONTWAIT, 1, MT_DATA); 3074 if (merr) { 3075 phd = mtod(merr, struct sctp_paramhdr *); 3076 /* 3077 * We cheat and use param 3078 * type since we did not 3079 * bother to define a error 3080 * cause struct. They are 3081 * the same basic format 3082 * with different names. 3083 */ 3084 phd->param_type = 3085 htons(SCTP_CAUSE_UNRECOG_CHUNK); 3086 phd->param_length = 3087 htons(chk_length + sizeof(*phd)); 3088 SCTP_BUF_LEN(merr) = sizeof(*phd); 3089 SCTP_BUF_NEXT(merr) = SCTP_M_COPYM(m, *offset, 3090 SCTP_SIZE32(chk_length), 3091 M_DONTWAIT); 3092 if (SCTP_BUF_NEXT(merr)) { 3093 sctp_queue_op_err(stcb, merr); 3094 } else { 3095 sctp_m_freem(merr); 3096 } 3097 } 3098 } 3099 if ((ch->ch.chunk_type & 0x80) == 0) { 3100 /* discard the rest of this packet */ 3101 stop_proc = 1; 3102 } /* else skip this bad chunk and 3103 * continue... */ 3104 break; 3105 }; /* switch of chunk type */ 3106 } 3107 *offset += SCTP_SIZE32(chk_length); 3108 if ((*offset >= length) || stop_proc) { 3109 /* no more data left in the mbuf chain */ 3110 stop_proc = 1; 3111 continue; 3112 } 3113 ch = (struct sctp_data_chunk *)sctp_m_getptr(m, *offset, 3114 sizeof(struct sctp_data_chunk), (uint8_t *) & chunk_buf); 3115 if (ch == NULL) { 3116 *offset = length; 3117 stop_proc = 1; 3118 break; 3119 3120 } 3121 } /* while */ 3122 if (break_flag) { 3123 /* 3124 * we need to report rwnd overrun drops. 3125 */ 3126 sctp_send_packet_dropped(stcb, net, *mm, iphlen, 0); 3127 } 3128 if (num_chunks) { 3129 /* 3130 * Did we get data, if so update the time for auto-close and 3131 * give peer credit for being alive. 3132 */ 3133 SCTP_STAT_INCR(sctps_recvpktwithdata); 3134 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 3135 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 3136 stcb->asoc.overall_error_count, 3137 0, 3138 SCTP_FROM_SCTP_INDATA, 3139 __LINE__); 3140 } 3141 stcb->asoc.overall_error_count = 0; 3142 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_last_rcvd); 3143 } 3144 /* now service all of the reassm queue if needed */ 3145 if (!(TAILQ_EMPTY(&asoc->reasmqueue))) 3146 sctp_service_queues(stcb, asoc); 3147 3148 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 3149 /* Assure that we ack right away */ 3150 stcb->asoc.send_sack = 1; 3151 } 3152 /* Start a sack timer or QUEUE a SACK for sending */ 3153 if ((stcb->asoc.cumulative_tsn == stcb->asoc.highest_tsn_inside_map) && 3154 (stcb->asoc.mapping_array[0] != 0xff)) { 3155 if ((stcb->asoc.data_pkts_seen >= stcb->asoc.sack_freq) || 3156 (stcb->asoc.delayed_ack == 0) || 3157 (stcb->asoc.numduptsns) || 3158 (stcb->asoc.send_sack == 1)) { 3159 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) { 3160 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer); 3161 } 3162 /* 3163 * EY if nr_sacks used then send an nr-sack , a sack 3164 * otherwise 3165 */ 3166 if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && stcb->asoc.peer_supports_nr_sack) 3167 sctp_send_nr_sack(stcb); 3168 else 3169 sctp_send_sack(stcb); 3170 } else { 3171 if (!SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) { 3172 sctp_timer_start(SCTP_TIMER_TYPE_RECV, 3173 stcb->sctp_ep, stcb, NULL); 3174 } 3175 } 3176 } else { 3177 sctp_sack_check(stcb, 1, was_a_gap, &abort_flag); 3178 } 3179 if (abort_flag) 3180 return (2); 3181 3182 return (0); 3183 } 3184 3185 static void 3186 sctp_handle_segments(struct mbuf *m, int *offset, struct sctp_tcb *stcb, struct sctp_association *asoc, 3187 struct sctp_sack_chunk *ch, uint32_t last_tsn, uint32_t * biggest_tsn_acked, 3188 uint32_t * biggest_newly_acked_tsn, uint32_t * this_sack_lowest_newack, 3189 int num_seg, int *ecn_seg_sums) 3190 { 3191 /************************************************/ 3192 /* process fragments and update sendqueue */ 3193 /************************************************/ 3194 struct sctp_sack *sack; 3195 struct sctp_gap_ack_block *frag, block; 3196 struct sctp_tmit_chunk *tp1; 3197 int i, j; 3198 unsigned int theTSN; 3199 int num_frs = 0; 3200 3201 uint16_t frag_strt, frag_end, primary_flag_set; 3202 u_long last_frag_high; 3203 3204 /* 3205 * @@@ JRI : TODO: This flag is not used anywhere .. remove? 3206 */ 3207 if (asoc->primary_destination->dest_state & SCTP_ADDR_SWITCH_PRIMARY) { 3208 primary_flag_set = 1; 3209 } else { 3210 primary_flag_set = 0; 3211 } 3212 sack = &ch->sack; 3213 3214 frag = (struct sctp_gap_ack_block *)sctp_m_getptr(m, *offset, 3215 sizeof(struct sctp_gap_ack_block), (uint8_t *) & block); 3216 *offset += sizeof(block); 3217 if (frag == NULL) { 3218 return; 3219 } 3220 tp1 = NULL; 3221 last_frag_high = 0; 3222 for (i = 0; i < num_seg; i++) { 3223 frag_strt = ntohs(frag->start); 3224 frag_end = ntohs(frag->end); 3225 /* some sanity checks on the fragment offsets */ 3226 if (frag_strt > frag_end) { 3227 /* this one is malformed, skip */ 3228 frag++; 3229 continue; 3230 } 3231 if (compare_with_wrap((frag_end + last_tsn), *biggest_tsn_acked, 3232 MAX_TSN)) 3233 *biggest_tsn_acked = frag_end + last_tsn; 3234 3235 /* mark acked dgs and find out the highestTSN being acked */ 3236 if (tp1 == NULL) { 3237 tp1 = TAILQ_FIRST(&asoc->sent_queue); 3238 3239 /* save the locations of the last frags */ 3240 last_frag_high = frag_end + last_tsn; 3241 } else { 3242 /* 3243 * now lets see if we need to reset the queue due to 3244 * a out-of-order SACK fragment 3245 */ 3246 if (compare_with_wrap(frag_strt + last_tsn, 3247 last_frag_high, MAX_TSN)) { 3248 /* 3249 * if the new frag starts after the last TSN 3250 * frag covered, we are ok and this one is 3251 * beyond the last one 3252 */ 3253 ; 3254 } else { 3255 /* 3256 * ok, they have reset us, so we need to 3257 * reset the queue this will cause extra 3258 * hunting but hey, they chose the 3259 * performance hit when they failed to order 3260 * their gaps 3261 */ 3262 tp1 = TAILQ_FIRST(&asoc->sent_queue); 3263 } 3264 last_frag_high = frag_end + last_tsn; 3265 } 3266 for (j = frag_strt; j <= frag_end; j++) { 3267 theTSN = j + last_tsn; 3268 while (tp1) { 3269 if (tp1->rec.data.doing_fast_retransmit) 3270 num_frs++; 3271 3272 /* 3273 * CMT: CUCv2 algorithm. For each TSN being 3274 * processed from the sent queue, track the 3275 * next expected pseudo-cumack, or 3276 * rtx_pseudo_cumack, if required. Separate 3277 * cumack trackers for first transmissions, 3278 * and retransmissions. 3279 */ 3280 if ((tp1->whoTo->find_pseudo_cumack == 1) && (tp1->sent < SCTP_DATAGRAM_RESEND) && 3281 (tp1->snd_count == 1)) { 3282 tp1->whoTo->pseudo_cumack = tp1->rec.data.TSN_seq; 3283 tp1->whoTo->find_pseudo_cumack = 0; 3284 } 3285 if ((tp1->whoTo->find_rtx_pseudo_cumack == 1) && (tp1->sent < SCTP_DATAGRAM_RESEND) && 3286 (tp1->snd_count > 1)) { 3287 tp1->whoTo->rtx_pseudo_cumack = tp1->rec.data.TSN_seq; 3288 tp1->whoTo->find_rtx_pseudo_cumack = 0; 3289 } 3290 if (tp1->rec.data.TSN_seq == theTSN) { 3291 if (tp1->sent != SCTP_DATAGRAM_UNSENT) { 3292 /* 3293 * must be held until 3294 * cum-ack passes 3295 */ 3296 /* 3297 * ECN Nonce: Add the nonce 3298 * value to the sender's 3299 * nonce sum 3300 */ 3301 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3302 /*- 3303 * If it is less than RESEND, it is 3304 * now no-longer in flight. 3305 * Higher values may already be set 3306 * via previous Gap Ack Blocks... 3307 * i.e. ACKED or RESEND. 3308 */ 3309 if (compare_with_wrap(tp1->rec.data.TSN_seq, 3310 *biggest_newly_acked_tsn, MAX_TSN)) { 3311 *biggest_newly_acked_tsn = tp1->rec.data.TSN_seq; 3312 } 3313 /* 3314 * CMT: SFR algo 3315 * (and HTNA) - set 3316 * saw_newack to 1 3317 * for dest being 3318 * newly acked. 3319 * update 3320 * this_sack_highest_ 3321 * newack if 3322 * appropriate. 3323 */ 3324 if (tp1->rec.data.chunk_was_revoked == 0) 3325 tp1->whoTo->saw_newack = 1; 3326 3327 if (compare_with_wrap(tp1->rec.data.TSN_seq, 3328 tp1->whoTo->this_sack_highest_newack, 3329 MAX_TSN)) { 3330 tp1->whoTo->this_sack_highest_newack = 3331 tp1->rec.data.TSN_seq; 3332 } 3333 /* 3334 * CMT DAC algo: 3335 * also update 3336 * this_sack_lowest_n 3337 * ewack 3338 */ 3339 if (*this_sack_lowest_newack == 0) { 3340 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 3341 sctp_log_sack(*this_sack_lowest_newack, 3342 last_tsn, 3343 tp1->rec.data.TSN_seq, 3344 0, 3345 0, 3346 SCTP_LOG_TSN_ACKED); 3347 } 3348 *this_sack_lowest_newack = tp1->rec.data.TSN_seq; 3349 } 3350 /* 3351 * CMT: CUCv2 3352 * algorithm. If 3353 * (rtx-)pseudo-cumac 3354 * k for corresp 3355 * dest is being 3356 * acked, then we 3357 * have a new 3358 * (rtx-)pseudo-cumac 3359 * k. Set 3360 * new_(rtx_)pseudo_c 3361 * umack to TRUE so 3362 * that the cwnd for 3363 * this dest can be 3364 * updated. Also 3365 * trigger search 3366 * for the next 3367 * expected 3368 * (rtx-)pseudo-cumac 3369 * k. Separate 3370 * pseudo_cumack 3371 * trackers for 3372 * first 3373 * transmissions and 3374 * retransmissions. 3375 */ 3376 if (tp1->rec.data.TSN_seq == tp1->whoTo->pseudo_cumack) { 3377 if (tp1->rec.data.chunk_was_revoked == 0) { 3378 tp1->whoTo->new_pseudo_cumack = 1; 3379 } 3380 tp1->whoTo->find_pseudo_cumack = 1; 3381 } 3382 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 3383 sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK); 3384 } 3385 if (tp1->rec.data.TSN_seq == tp1->whoTo->rtx_pseudo_cumack) { 3386 if (tp1->rec.data.chunk_was_revoked == 0) { 3387 tp1->whoTo->new_pseudo_cumack = 1; 3388 } 3389 tp1->whoTo->find_rtx_pseudo_cumack = 1; 3390 } 3391 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 3392 sctp_log_sack(*biggest_newly_acked_tsn, 3393 last_tsn, 3394 tp1->rec.data.TSN_seq, 3395 frag_strt, 3396 frag_end, 3397 SCTP_LOG_TSN_ACKED); 3398 } 3399 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3400 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_GAP, 3401 tp1->whoTo->flight_size, 3402 tp1->book_size, 3403 (uintptr_t) tp1->whoTo, 3404 tp1->rec.data.TSN_seq); 3405 } 3406 sctp_flight_size_decrease(tp1); 3407 sctp_total_flight_decrease(stcb, tp1); 3408 3409 tp1->whoTo->net_ack += tp1->send_size; 3410 if (tp1->snd_count < 2) { 3411 /* 3412 * True 3413 * non-retran 3414 * smited 3415 * chunk */ 3416 tp1->whoTo->net_ack2 += tp1->send_size; 3417 3418 /* 3419 * update RTO 3420 * too ? */ 3421 if (tp1->do_rtt) { 3422 tp1->whoTo->RTO = 3423 sctp_calculate_rto(stcb, 3424 asoc, 3425 tp1->whoTo, 3426 &tp1->sent_rcv_time, 3427 sctp_align_safe_nocopy); 3428 tp1->do_rtt = 0; 3429 } 3430 } 3431 } 3432 if (tp1->sent <= SCTP_DATAGRAM_RESEND) { 3433 (*ecn_seg_sums) += tp1->rec.data.ect_nonce; 3434 (*ecn_seg_sums) &= SCTP_SACK_NONCE_SUM; 3435 if (compare_with_wrap(tp1->rec.data.TSN_seq, 3436 asoc->this_sack_highest_gap, 3437 MAX_TSN)) { 3438 asoc->this_sack_highest_gap = 3439 tp1->rec.data.TSN_seq; 3440 } 3441 if (tp1->sent == SCTP_DATAGRAM_RESEND) { 3442 sctp_ucount_decr(asoc->sent_queue_retran_cnt); 3443 #ifdef SCTP_AUDITING_ENABLED 3444 sctp_audit_log(0xB2, 3445 (asoc->sent_queue_retran_cnt & 0x000000ff)); 3446 #endif 3447 } 3448 } 3449 /* 3450 * All chunks NOT UNSENT 3451 * fall through here and are 3452 * marked (leave PR-SCTP 3453 * ones that are to skip 3454 * alone though) 3455 */ 3456 if (tp1->sent != SCTP_FORWARD_TSN_SKIP) 3457 tp1->sent = SCTP_DATAGRAM_MARKED; 3458 3459 if (tp1->rec.data.chunk_was_revoked) { 3460 /* deflate the cwnd */ 3461 tp1->whoTo->cwnd -= tp1->book_size; 3462 tp1->rec.data.chunk_was_revoked = 0; 3463 } 3464 } 3465 break; 3466 } /* if (tp1->TSN_seq == theTSN) */ 3467 if (compare_with_wrap(tp1->rec.data.TSN_seq, theTSN, 3468 MAX_TSN)) 3469 break; 3470 3471 tp1 = TAILQ_NEXT(tp1, sctp_next); 3472 } /* end while (tp1) */ 3473 } /* end for (j = fragStart */ 3474 frag = (struct sctp_gap_ack_block *)sctp_m_getptr(m, *offset, 3475 sizeof(struct sctp_gap_ack_block), (uint8_t *) & block); 3476 *offset += sizeof(block); 3477 if (frag == NULL) { 3478 break; 3479 } 3480 } 3481 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3482 if (num_frs) 3483 sctp_log_fr(*biggest_tsn_acked, 3484 *biggest_newly_acked_tsn, 3485 last_tsn, SCTP_FR_LOG_BIGGEST_TSNS); 3486 } 3487 } 3488 3489 static void 3490 sctp_check_for_revoked(struct sctp_tcb *stcb, 3491 struct sctp_association *asoc, uint32_t cumack, 3492 u_long biggest_tsn_acked) 3493 { 3494 struct sctp_tmit_chunk *tp1; 3495 int tot_revoked = 0; 3496 3497 tp1 = TAILQ_FIRST(&asoc->sent_queue); 3498 while (tp1) { 3499 if (compare_with_wrap(tp1->rec.data.TSN_seq, cumack, 3500 MAX_TSN)) { 3501 /* 3502 * ok this guy is either ACK or MARKED. If it is 3503 * ACKED it has been previously acked but not this 3504 * time i.e. revoked. If it is MARKED it was ACK'ed 3505 * again. 3506 */ 3507 if (compare_with_wrap(tp1->rec.data.TSN_seq, biggest_tsn_acked, 3508 MAX_TSN)) 3509 break; 3510 3511 3512 if (tp1->sent == SCTP_DATAGRAM_ACKED) { 3513 /* it has been revoked */ 3514 tp1->sent = SCTP_DATAGRAM_SENT; 3515 tp1->rec.data.chunk_was_revoked = 1; 3516 /* 3517 * We must add this stuff back in to assure 3518 * timers and such get started. 3519 */ 3520 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3521 sctp_misc_ints(SCTP_FLIGHT_LOG_UP_REVOKE, 3522 tp1->whoTo->flight_size, 3523 tp1->book_size, 3524 (uintptr_t) tp1->whoTo, 3525 tp1->rec.data.TSN_seq); 3526 } 3527 sctp_flight_size_increase(tp1); 3528 sctp_total_flight_increase(stcb, tp1); 3529 /* 3530 * We inflate the cwnd to compensate for our 3531 * artificial inflation of the flight_size. 3532 */ 3533 tp1->whoTo->cwnd += tp1->book_size; 3534 tot_revoked++; 3535 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 3536 sctp_log_sack(asoc->last_acked_seq, 3537 cumack, 3538 tp1->rec.data.TSN_seq, 3539 0, 3540 0, 3541 SCTP_LOG_TSN_REVOKED); 3542 } 3543 } else if (tp1->sent == SCTP_DATAGRAM_MARKED) { 3544 /* it has been re-acked in this SACK */ 3545 tp1->sent = SCTP_DATAGRAM_ACKED; 3546 } 3547 } 3548 if (tp1->sent == SCTP_DATAGRAM_UNSENT) 3549 break; 3550 tp1 = TAILQ_NEXT(tp1, sctp_next); 3551 } 3552 if (tot_revoked > 0) { 3553 /* 3554 * Setup the ecn nonce re-sync point. We do this since once 3555 * data is revoked we begin to retransmit things, which do 3556 * NOT have the ECN bits set. This means we are now out of 3557 * sync and must wait until we get back in sync with the 3558 * peer to check ECN bits. 3559 */ 3560 tp1 = TAILQ_FIRST(&asoc->send_queue); 3561 if (tp1 == NULL) { 3562 asoc->nonce_resync_tsn = asoc->sending_seq; 3563 } else { 3564 asoc->nonce_resync_tsn = tp1->rec.data.TSN_seq; 3565 } 3566 asoc->nonce_wait_for_ecne = 0; 3567 asoc->nonce_sum_check = 0; 3568 } 3569 } 3570 3571 3572 static void 3573 sctp_strike_gap_ack_chunks(struct sctp_tcb *stcb, struct sctp_association *asoc, 3574 u_long biggest_tsn_acked, u_long biggest_tsn_newly_acked, u_long this_sack_lowest_newack, int accum_moved) 3575 { 3576 struct sctp_tmit_chunk *tp1; 3577 int strike_flag = 0; 3578 struct timeval now; 3579 int tot_retrans = 0; 3580 uint32_t sending_seq; 3581 struct sctp_nets *net; 3582 int num_dests_sacked = 0; 3583 3584 /* 3585 * select the sending_seq, this is either the next thing ready to be 3586 * sent but not transmitted, OR, the next seq we assign. 3587 */ 3588 tp1 = TAILQ_FIRST(&stcb->asoc.send_queue); 3589 if (tp1 == NULL) { 3590 sending_seq = asoc->sending_seq; 3591 } else { 3592 sending_seq = tp1->rec.data.TSN_seq; 3593 } 3594 3595 /* CMT DAC algo: finding out if SACK is a mixed SACK */ 3596 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) { 3597 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 3598 if (net->saw_newack) 3599 num_dests_sacked++; 3600 } 3601 } 3602 if (stcb->asoc.peer_supports_prsctp) { 3603 (void)SCTP_GETTIME_TIMEVAL(&now); 3604 } 3605 tp1 = TAILQ_FIRST(&asoc->sent_queue); 3606 while (tp1) { 3607 strike_flag = 0; 3608 if (tp1->no_fr_allowed) { 3609 /* this one had a timeout or something */ 3610 tp1 = TAILQ_NEXT(tp1, sctp_next); 3611 continue; 3612 } 3613 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3614 if (tp1->sent < SCTP_DATAGRAM_RESEND) 3615 sctp_log_fr(biggest_tsn_newly_acked, 3616 tp1->rec.data.TSN_seq, 3617 tp1->sent, 3618 SCTP_FR_LOG_CHECK_STRIKE); 3619 } 3620 if (compare_with_wrap(tp1->rec.data.TSN_seq, biggest_tsn_acked, 3621 MAX_TSN) || 3622 tp1->sent == SCTP_DATAGRAM_UNSENT) { 3623 /* done */ 3624 break; 3625 } 3626 if (stcb->asoc.peer_supports_prsctp) { 3627 if ((PR_SCTP_TTL_ENABLED(tp1->flags)) && tp1->sent < SCTP_DATAGRAM_ACKED) { 3628 /* Is it expired? */ 3629 if ( 3630 /* 3631 * TODO sctp_constants.h needs alternative 3632 * time macros when _KERNEL is undefined. 3633 */ 3634 (timevalcmp(&now, &tp1->rec.data.timetodrop, >)) 3635 ) { 3636 /* Yes so drop it */ 3637 if (tp1->data != NULL) { 3638 (void)sctp_release_pr_sctp_chunk(stcb, tp1, 3639 (SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT), 3640 SCTP_SO_NOT_LOCKED); 3641 } 3642 tp1 = TAILQ_NEXT(tp1, sctp_next); 3643 continue; 3644 } 3645 } 3646 } 3647 if (compare_with_wrap(tp1->rec.data.TSN_seq, 3648 asoc->this_sack_highest_gap, MAX_TSN)) { 3649 /* we are beyond the tsn in the sack */ 3650 break; 3651 } 3652 if (tp1->sent >= SCTP_DATAGRAM_RESEND) { 3653 /* either a RESEND, ACKED, or MARKED */ 3654 /* skip */ 3655 tp1 = TAILQ_NEXT(tp1, sctp_next); 3656 continue; 3657 } 3658 /* 3659 * CMT : SFR algo (covers part of DAC and HTNA as well) 3660 */ 3661 if (tp1->whoTo && tp1->whoTo->saw_newack == 0) { 3662 /* 3663 * No new acks were receieved for data sent to this 3664 * dest. Therefore, according to the SFR algo for 3665 * CMT, no data sent to this dest can be marked for 3666 * FR using this SACK. 3667 */ 3668 tp1 = TAILQ_NEXT(tp1, sctp_next); 3669 continue; 3670 } else if (tp1->whoTo && compare_with_wrap(tp1->rec.data.TSN_seq, 3671 tp1->whoTo->this_sack_highest_newack, MAX_TSN)) { 3672 /* 3673 * CMT: New acks were receieved for data sent to 3674 * this dest. But no new acks were seen for data 3675 * sent after tp1. Therefore, according to the SFR 3676 * algo for CMT, tp1 cannot be marked for FR using 3677 * this SACK. This step covers part of the DAC algo 3678 * and the HTNA algo as well. 3679 */ 3680 tp1 = TAILQ_NEXT(tp1, sctp_next); 3681 continue; 3682 } 3683 /* 3684 * Here we check to see if we were have already done a FR 3685 * and if so we see if the biggest TSN we saw in the sack is 3686 * smaller than the recovery point. If so we don't strike 3687 * the tsn... otherwise we CAN strike the TSN. 3688 */ 3689 /* 3690 * @@@ JRI: Check for CMT if (accum_moved && 3691 * asoc->fast_retran_loss_recovery && (sctp_cmt_on_off == 3692 * 0)) { 3693 */ 3694 if (accum_moved && asoc->fast_retran_loss_recovery) { 3695 /* 3696 * Strike the TSN if in fast-recovery and cum-ack 3697 * moved. 3698 */ 3699 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3700 sctp_log_fr(biggest_tsn_newly_acked, 3701 tp1->rec.data.TSN_seq, 3702 tp1->sent, 3703 SCTP_FR_LOG_STRIKE_CHUNK); 3704 } 3705 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3706 tp1->sent++; 3707 } 3708 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) { 3709 /* 3710 * CMT DAC algorithm: If SACK flag is set to 3711 * 0, then lowest_newack test will not pass 3712 * because it would have been set to the 3713 * cumack earlier. If not already to be 3714 * rtx'd, If not a mixed sack and if tp1 is 3715 * not between two sacked TSNs, then mark by 3716 * one more. NOTE that we are marking by one 3717 * additional time since the SACK DAC flag 3718 * indicates that two packets have been 3719 * received after this missing TSN. 3720 */ 3721 if ((tp1->sent < SCTP_DATAGRAM_RESEND) && (num_dests_sacked == 1) && 3722 compare_with_wrap(this_sack_lowest_newack, tp1->rec.data.TSN_seq, MAX_TSN)) { 3723 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3724 sctp_log_fr(16 + num_dests_sacked, 3725 tp1->rec.data.TSN_seq, 3726 tp1->sent, 3727 SCTP_FR_LOG_STRIKE_CHUNK); 3728 } 3729 tp1->sent++; 3730 } 3731 } 3732 } else if ((tp1->rec.data.doing_fast_retransmit) && (SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0)) { 3733 /* 3734 * For those that have done a FR we must take 3735 * special consideration if we strike. I.e the 3736 * biggest_newly_acked must be higher than the 3737 * sending_seq at the time we did the FR. 3738 */ 3739 if ( 3740 #ifdef SCTP_FR_TO_ALTERNATE 3741 /* 3742 * If FR's go to new networks, then we must only do 3743 * this for singly homed asoc's. However if the FR's 3744 * go to the same network (Armando's work) then its 3745 * ok to FR multiple times. 3746 */ 3747 (asoc->numnets < 2) 3748 #else 3749 (1) 3750 #endif 3751 ) { 3752 3753 if ((compare_with_wrap(biggest_tsn_newly_acked, 3754 tp1->rec.data.fast_retran_tsn, MAX_TSN)) || 3755 (biggest_tsn_newly_acked == 3756 tp1->rec.data.fast_retran_tsn)) { 3757 /* 3758 * Strike the TSN, since this ack is 3759 * beyond where things were when we 3760 * did a FR. 3761 */ 3762 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3763 sctp_log_fr(biggest_tsn_newly_acked, 3764 tp1->rec.data.TSN_seq, 3765 tp1->sent, 3766 SCTP_FR_LOG_STRIKE_CHUNK); 3767 } 3768 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3769 tp1->sent++; 3770 } 3771 strike_flag = 1; 3772 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) { 3773 /* 3774 * CMT DAC algorithm: If 3775 * SACK flag is set to 0, 3776 * then lowest_newack test 3777 * will not pass because it 3778 * would have been set to 3779 * the cumack earlier. If 3780 * not already to be rtx'd, 3781 * If not a mixed sack and 3782 * if tp1 is not between two 3783 * sacked TSNs, then mark by 3784 * one more. NOTE that we 3785 * are marking by one 3786 * additional time since the 3787 * SACK DAC flag indicates 3788 * that two packets have 3789 * been received after this 3790 * missing TSN. 3791 */ 3792 if ((tp1->sent < SCTP_DATAGRAM_RESEND) && 3793 (num_dests_sacked == 1) && 3794 compare_with_wrap(this_sack_lowest_newack, 3795 tp1->rec.data.TSN_seq, MAX_TSN)) { 3796 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3797 sctp_log_fr(32 + num_dests_sacked, 3798 tp1->rec.data.TSN_seq, 3799 tp1->sent, 3800 SCTP_FR_LOG_STRIKE_CHUNK); 3801 } 3802 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3803 tp1->sent++; 3804 } 3805 } 3806 } 3807 } 3808 } 3809 /* 3810 * JRI: TODO: remove code for HTNA algo. CMT's SFR 3811 * algo covers HTNA. 3812 */ 3813 } else if (compare_with_wrap(tp1->rec.data.TSN_seq, 3814 biggest_tsn_newly_acked, MAX_TSN)) { 3815 /* 3816 * We don't strike these: This is the HTNA 3817 * algorithm i.e. we don't strike If our TSN is 3818 * larger than the Highest TSN Newly Acked. 3819 */ 3820 ; 3821 } else { 3822 /* Strike the TSN */ 3823 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3824 sctp_log_fr(biggest_tsn_newly_acked, 3825 tp1->rec.data.TSN_seq, 3826 tp1->sent, 3827 SCTP_FR_LOG_STRIKE_CHUNK); 3828 } 3829 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3830 tp1->sent++; 3831 } 3832 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) { 3833 /* 3834 * CMT DAC algorithm: If SACK flag is set to 3835 * 0, then lowest_newack test will not pass 3836 * because it would have been set to the 3837 * cumack earlier. If not already to be 3838 * rtx'd, If not a mixed sack and if tp1 is 3839 * not between two sacked TSNs, then mark by 3840 * one more. NOTE that we are marking by one 3841 * additional time since the SACK DAC flag 3842 * indicates that two packets have been 3843 * received after this missing TSN. 3844 */ 3845 if ((tp1->sent < SCTP_DATAGRAM_RESEND) && (num_dests_sacked == 1) && 3846 compare_with_wrap(this_sack_lowest_newack, tp1->rec.data.TSN_seq, MAX_TSN)) { 3847 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3848 sctp_log_fr(48 + num_dests_sacked, 3849 tp1->rec.data.TSN_seq, 3850 tp1->sent, 3851 SCTP_FR_LOG_STRIKE_CHUNK); 3852 } 3853 tp1->sent++; 3854 } 3855 } 3856 } 3857 if (tp1->sent == SCTP_DATAGRAM_RESEND) { 3858 struct sctp_nets *alt; 3859 3860 /* fix counts and things */ 3861 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3862 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_RSND, 3863 (tp1->whoTo ? (tp1->whoTo->flight_size) : 0), 3864 tp1->book_size, 3865 (uintptr_t) tp1->whoTo, 3866 tp1->rec.data.TSN_seq); 3867 } 3868 if (tp1->whoTo) { 3869 tp1->whoTo->net_ack++; 3870 sctp_flight_size_decrease(tp1); 3871 } 3872 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) { 3873 sctp_log_rwnd(SCTP_INCREASE_PEER_RWND, 3874 asoc->peers_rwnd, tp1->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)); 3875 } 3876 /* add back to the rwnd */ 3877 asoc->peers_rwnd += (tp1->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)); 3878 3879 /* remove from the total flight */ 3880 sctp_total_flight_decrease(stcb, tp1); 3881 3882 if ((stcb->asoc.peer_supports_prsctp) && 3883 (PR_SCTP_RTX_ENABLED(tp1->flags))) { 3884 /* 3885 * Has it been retransmitted tv_sec times? - 3886 * we store the retran count there. 3887 */ 3888 if (tp1->snd_count > tp1->rec.data.timetodrop.tv_sec) { 3889 /* Yes, so drop it */ 3890 if (tp1->data != NULL) { 3891 (void)sctp_release_pr_sctp_chunk(stcb, tp1, 3892 (SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT), 3893 SCTP_SO_NOT_LOCKED); 3894 } 3895 /* Make sure to flag we had a FR */ 3896 tp1->whoTo->net_ack++; 3897 tp1 = TAILQ_NEXT(tp1, sctp_next); 3898 continue; 3899 } 3900 } 3901 /* printf("OK, we are now ready to FR this guy\n"); */ 3902 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3903 sctp_log_fr(tp1->rec.data.TSN_seq, tp1->snd_count, 3904 0, SCTP_FR_MARKED); 3905 } 3906 if (strike_flag) { 3907 /* This is a subsequent FR */ 3908 SCTP_STAT_INCR(sctps_sendmultfastretrans); 3909 } 3910 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3911 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off)) { 3912 /* 3913 * CMT: Using RTX_SSTHRESH policy for CMT. 3914 * If CMT is being used, then pick dest with 3915 * largest ssthresh for any retransmission. 3916 */ 3917 tp1->no_fr_allowed = 1; 3918 alt = tp1->whoTo; 3919 /* sa_ignore NO_NULL_CHK */ 3920 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_pf)) { 3921 /* 3922 * JRS 5/18/07 - If CMT PF is on, 3923 * use the PF version of 3924 * find_alt_net() 3925 */ 3926 alt = sctp_find_alternate_net(stcb, alt, 2); 3927 } else { 3928 /* 3929 * JRS 5/18/07 - If only CMT is on, 3930 * use the CMT version of 3931 * find_alt_net() 3932 */ 3933 /* sa_ignore NO_NULL_CHK */ 3934 alt = sctp_find_alternate_net(stcb, alt, 1); 3935 } 3936 if (alt == NULL) { 3937 alt = tp1->whoTo; 3938 } 3939 /* 3940 * CUCv2: If a different dest is picked for 3941 * the retransmission, then new 3942 * (rtx-)pseudo_cumack needs to be tracked 3943 * for orig dest. Let CUCv2 track new (rtx-) 3944 * pseudo-cumack always. 3945 */ 3946 if (tp1->whoTo) { 3947 tp1->whoTo->find_pseudo_cumack = 1; 3948 tp1->whoTo->find_rtx_pseudo_cumack = 1; 3949 } 3950 } else {/* CMT is OFF */ 3951 3952 #ifdef SCTP_FR_TO_ALTERNATE 3953 /* Can we find an alternate? */ 3954 alt = sctp_find_alternate_net(stcb, tp1->whoTo, 0); 3955 #else 3956 /* 3957 * default behavior is to NOT retransmit 3958 * FR's to an alternate. Armando Caro's 3959 * paper details why. 3960 */ 3961 alt = tp1->whoTo; 3962 #endif 3963 } 3964 3965 tp1->rec.data.doing_fast_retransmit = 1; 3966 tot_retrans++; 3967 /* mark the sending seq for possible subsequent FR's */ 3968 /* 3969 * printf("Marking TSN for FR new value %x\n", 3970 * (uint32_t)tpi->rec.data.TSN_seq); 3971 */ 3972 if (TAILQ_EMPTY(&asoc->send_queue)) { 3973 /* 3974 * If the queue of send is empty then its 3975 * the next sequence number that will be 3976 * assigned so we subtract one from this to 3977 * get the one we last sent. 3978 */ 3979 tp1->rec.data.fast_retran_tsn = sending_seq; 3980 } else { 3981 /* 3982 * If there are chunks on the send queue 3983 * (unsent data that has made it from the 3984 * stream queues but not out the door, we 3985 * take the first one (which will have the 3986 * lowest TSN) and subtract one to get the 3987 * one we last sent. 3988 */ 3989 struct sctp_tmit_chunk *ttt; 3990 3991 ttt = TAILQ_FIRST(&asoc->send_queue); 3992 tp1->rec.data.fast_retran_tsn = 3993 ttt->rec.data.TSN_seq; 3994 } 3995 3996 if (tp1->do_rtt) { 3997 /* 3998 * this guy had a RTO calculation pending on 3999 * it, cancel it 4000 */ 4001 tp1->do_rtt = 0; 4002 } 4003 if (alt != tp1->whoTo) { 4004 /* yes, there is an alternate. */ 4005 sctp_free_remote_addr(tp1->whoTo); 4006 /* sa_ignore FREED_MEMORY */ 4007 tp1->whoTo = alt; 4008 atomic_add_int(&alt->ref_count, 1); 4009 } 4010 } 4011 tp1 = TAILQ_NEXT(tp1, sctp_next); 4012 } /* while (tp1) */ 4013 4014 if (tot_retrans > 0) { 4015 /* 4016 * Setup the ecn nonce re-sync point. We do this since once 4017 * we go to FR something we introduce a Karn's rule scenario 4018 * and won't know the totals for the ECN bits. 4019 */ 4020 asoc->nonce_resync_tsn = sending_seq; 4021 asoc->nonce_wait_for_ecne = 0; 4022 asoc->nonce_sum_check = 0; 4023 } 4024 } 4025 4026 struct sctp_tmit_chunk * 4027 sctp_try_advance_peer_ack_point(struct sctp_tcb *stcb, 4028 struct sctp_association *asoc) 4029 { 4030 struct sctp_tmit_chunk *tp1, *tp2, *a_adv = NULL; 4031 struct timeval now; 4032 int now_filled = 0; 4033 4034 if (asoc->peer_supports_prsctp == 0) { 4035 return (NULL); 4036 } 4037 tp1 = TAILQ_FIRST(&asoc->sent_queue); 4038 while (tp1) { 4039 if (tp1->sent != SCTP_FORWARD_TSN_SKIP && 4040 tp1->sent != SCTP_DATAGRAM_RESEND) { 4041 /* no chance to advance, out of here */ 4042 break; 4043 } 4044 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) { 4045 if (tp1->sent == SCTP_FORWARD_TSN_SKIP) { 4046 sctp_misc_ints(SCTP_FWD_TSN_CHECK, 4047 asoc->advanced_peer_ack_point, 4048 tp1->rec.data.TSN_seq, 0, 0); 4049 } 4050 } 4051 if (!PR_SCTP_ENABLED(tp1->flags)) { 4052 /* 4053 * We can't fwd-tsn past any that are reliable aka 4054 * retransmitted until the asoc fails. 4055 */ 4056 break; 4057 } 4058 if (!now_filled) { 4059 (void)SCTP_GETTIME_TIMEVAL(&now); 4060 now_filled = 1; 4061 } 4062 tp2 = TAILQ_NEXT(tp1, sctp_next); 4063 /* 4064 * now we got a chunk which is marked for another 4065 * retransmission to a PR-stream but has run out its chances 4066 * already maybe OR has been marked to skip now. Can we skip 4067 * it if its a resend? 4068 */ 4069 if (tp1->sent == SCTP_DATAGRAM_RESEND && 4070 (PR_SCTP_TTL_ENABLED(tp1->flags))) { 4071 /* 4072 * Now is this one marked for resend and its time is 4073 * now up? 4074 */ 4075 if (timevalcmp(&now, &tp1->rec.data.timetodrop, >)) { 4076 /* Yes so drop it */ 4077 if (tp1->data) { 4078 (void)sctp_release_pr_sctp_chunk(stcb, tp1, 4079 (SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT), 4080 SCTP_SO_NOT_LOCKED); 4081 } 4082 } else { 4083 /* 4084 * No, we are done when hit one for resend 4085 * whos time as not expired. 4086 */ 4087 break; 4088 } 4089 } 4090 /* 4091 * Ok now if this chunk is marked to drop it we can clean up 4092 * the chunk, advance our peer ack point and we can check 4093 * the next chunk. 4094 */ 4095 if (tp1->sent == SCTP_FORWARD_TSN_SKIP) { 4096 /* advance PeerAckPoint goes forward */ 4097 if (compare_with_wrap(tp1->rec.data.TSN_seq, 4098 asoc->advanced_peer_ack_point, 4099 MAX_TSN)) { 4100 4101 asoc->advanced_peer_ack_point = tp1->rec.data.TSN_seq; 4102 a_adv = tp1; 4103 } else if (tp1->rec.data.TSN_seq == asoc->advanced_peer_ack_point) { 4104 /* No update but we do save the chk */ 4105 a_adv = tp1; 4106 } 4107 } else { 4108 /* 4109 * If it is still in RESEND we can advance no 4110 * further 4111 */ 4112 break; 4113 } 4114 /* 4115 * If we hit here we just dumped tp1, move to next tsn on 4116 * sent queue. 4117 */ 4118 tp1 = tp2; 4119 } 4120 return (a_adv); 4121 } 4122 4123 static int 4124 sctp_fs_audit(struct sctp_association *asoc) 4125 { 4126 struct sctp_tmit_chunk *chk; 4127 int inflight = 0, resend = 0, inbetween = 0, acked = 0, above = 0; 4128 int entry_flight, entry_cnt, ret; 4129 4130 entry_flight = asoc->total_flight; 4131 entry_cnt = asoc->total_flight_count; 4132 ret = 0; 4133 4134 if (asoc->pr_sctp_cnt >= asoc->sent_queue_cnt) 4135 return (0); 4136 4137 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) { 4138 if (chk->sent < SCTP_DATAGRAM_RESEND) { 4139 printf("Chk TSN:%u size:%d inflight cnt:%d\n", 4140 chk->rec.data.TSN_seq, 4141 chk->send_size, 4142 chk->snd_count 4143 ); 4144 inflight++; 4145 } else if (chk->sent == SCTP_DATAGRAM_RESEND) { 4146 resend++; 4147 } else if (chk->sent < SCTP_DATAGRAM_ACKED) { 4148 inbetween++; 4149 } else if (chk->sent > SCTP_DATAGRAM_ACKED) { 4150 above++; 4151 } else { 4152 acked++; 4153 } 4154 } 4155 4156 if ((inflight > 0) || (inbetween > 0)) { 4157 #ifdef INVARIANTS 4158 panic("Flight size-express incorrect? \n"); 4159 #else 4160 printf("asoc->total_flight:%d cnt:%d\n", 4161 entry_flight, entry_cnt); 4162 4163 SCTP_PRINTF("Flight size-express incorrect F:%d I:%d R:%d Ab:%d ACK:%d\n", 4164 inflight, inbetween, resend, above, acked); 4165 ret = 1; 4166 #endif 4167 } 4168 return (ret); 4169 } 4170 4171 4172 static void 4173 sctp_window_probe_recovery(struct sctp_tcb *stcb, 4174 struct sctp_association *asoc, 4175 struct sctp_nets *net, 4176 struct sctp_tmit_chunk *tp1) 4177 { 4178 tp1->window_probe = 0; 4179 if ((tp1->sent >= SCTP_DATAGRAM_ACKED) || (tp1->data == NULL)) { 4180 /* TSN's skipped we do NOT move back. */ 4181 sctp_misc_ints(SCTP_FLIGHT_LOG_DWN_WP_FWD, 4182 tp1->whoTo->flight_size, 4183 tp1->book_size, 4184 (uintptr_t) tp1->whoTo, 4185 tp1->rec.data.TSN_seq); 4186 return; 4187 } 4188 /* First setup this by shrinking flight */ 4189 sctp_flight_size_decrease(tp1); 4190 sctp_total_flight_decrease(stcb, tp1); 4191 /* Now mark for resend */ 4192 tp1->sent = SCTP_DATAGRAM_RESEND; 4193 asoc->sent_queue_retran_cnt++; 4194 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 4195 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_WP, 4196 tp1->whoTo->flight_size, 4197 tp1->book_size, 4198 (uintptr_t) tp1->whoTo, 4199 tp1->rec.data.TSN_seq); 4200 } 4201 } 4202 4203 void 4204 sctp_express_handle_sack(struct sctp_tcb *stcb, uint32_t cumack, 4205 uint32_t rwnd, int nonce_sum_flag, int *abort_now) 4206 { 4207 struct sctp_nets *net; 4208 struct sctp_association *asoc; 4209 struct sctp_tmit_chunk *tp1, *tp2; 4210 uint32_t old_rwnd; 4211 int win_probe_recovery = 0; 4212 int win_probe_recovered = 0; 4213 int j, done_once = 0; 4214 4215 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_SACK_ARRIVALS_ENABLE) { 4216 sctp_misc_ints(SCTP_SACK_LOG_EXPRESS, cumack, 4217 rwnd, stcb->asoc.last_acked_seq, stcb->asoc.peers_rwnd); 4218 } 4219 SCTP_TCB_LOCK_ASSERT(stcb); 4220 #ifdef SCTP_ASOCLOG_OF_TSNS 4221 stcb->asoc.cumack_log[stcb->asoc.cumack_log_at] = cumack; 4222 stcb->asoc.cumack_log_at++; 4223 if (stcb->asoc.cumack_log_at > SCTP_TSN_LOG_SIZE) { 4224 stcb->asoc.cumack_log_at = 0; 4225 } 4226 #endif 4227 asoc = &stcb->asoc; 4228 old_rwnd = asoc->peers_rwnd; 4229 if (compare_with_wrap(asoc->last_acked_seq, cumack, MAX_TSN)) { 4230 /* old ack */ 4231 return; 4232 } else if (asoc->last_acked_seq == cumack) { 4233 /* Window update sack */ 4234 asoc->peers_rwnd = sctp_sbspace_sub(rwnd, 4235 (uint32_t) (asoc->total_flight + (asoc->sent_queue_cnt * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)))); 4236 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4237 /* SWS sender side engages */ 4238 asoc->peers_rwnd = 0; 4239 } 4240 if (asoc->peers_rwnd > old_rwnd) { 4241 goto again; 4242 } 4243 return; 4244 } 4245 /* First setup for CC stuff */ 4246 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4247 net->prev_cwnd = net->cwnd; 4248 net->net_ack = 0; 4249 net->net_ack2 = 0; 4250 4251 /* 4252 * CMT: Reset CUC and Fast recovery algo variables before 4253 * SACK processing 4254 */ 4255 net->new_pseudo_cumack = 0; 4256 net->will_exit_fast_recovery = 0; 4257 } 4258 if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) { 4259 uint32_t send_s; 4260 4261 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 4262 tp1 = TAILQ_LAST(&asoc->sent_queue, 4263 sctpchunk_listhead); 4264 send_s = tp1->rec.data.TSN_seq + 1; 4265 } else { 4266 send_s = asoc->sending_seq; 4267 } 4268 if ((cumack == send_s) || 4269 compare_with_wrap(cumack, send_s, MAX_TSN)) { 4270 #ifndef INVARIANTS 4271 struct mbuf *oper; 4272 4273 #endif 4274 #ifdef INVARIANTS 4275 panic("Impossible sack 1"); 4276 #else 4277 *abort_now = 1; 4278 /* XXX */ 4279 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)), 4280 0, M_DONTWAIT, 1, MT_DATA); 4281 if (oper) { 4282 struct sctp_paramhdr *ph; 4283 uint32_t *ippp; 4284 4285 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + 4286 sizeof(uint32_t); 4287 ph = mtod(oper, struct sctp_paramhdr *); 4288 ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 4289 ph->param_length = htons(SCTP_BUF_LEN(oper)); 4290 ippp = (uint32_t *) (ph + 1); 4291 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_25); 4292 } 4293 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_25; 4294 sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); 4295 return; 4296 #endif 4297 } 4298 } 4299 asoc->this_sack_highest_gap = cumack; 4300 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4301 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4302 stcb->asoc.overall_error_count, 4303 0, 4304 SCTP_FROM_SCTP_INDATA, 4305 __LINE__); 4306 } 4307 stcb->asoc.overall_error_count = 0; 4308 if (compare_with_wrap(cumack, asoc->last_acked_seq, MAX_TSN)) { 4309 /* process the new consecutive TSN first */ 4310 tp1 = TAILQ_FIRST(&asoc->sent_queue); 4311 while (tp1) { 4312 tp2 = TAILQ_NEXT(tp1, sctp_next); 4313 if (compare_with_wrap(cumack, tp1->rec.data.TSN_seq, 4314 MAX_TSN) || 4315 cumack == tp1->rec.data.TSN_seq) { 4316 if (tp1->sent == SCTP_DATAGRAM_UNSENT) { 4317 printf("Warning, an unsent is now acked?\n"); 4318 } 4319 /* 4320 * ECN Nonce: Add the nonce to the sender's 4321 * nonce sum 4322 */ 4323 asoc->nonce_sum_expect_base += tp1->rec.data.ect_nonce; 4324 if (tp1->sent < SCTP_DATAGRAM_ACKED) { 4325 /* 4326 * If it is less than ACKED, it is 4327 * now no-longer in flight. Higher 4328 * values may occur during marking 4329 */ 4330 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 4331 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 4332 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_CA, 4333 tp1->whoTo->flight_size, 4334 tp1->book_size, 4335 (uintptr_t) tp1->whoTo, 4336 tp1->rec.data.TSN_seq); 4337 } 4338 sctp_flight_size_decrease(tp1); 4339 /* sa_ignore NO_NULL_CHK */ 4340 sctp_total_flight_decrease(stcb, tp1); 4341 } 4342 tp1->whoTo->net_ack += tp1->send_size; 4343 if (tp1->snd_count < 2) { 4344 /* 4345 * True non-retransmited 4346 * chunk 4347 */ 4348 tp1->whoTo->net_ack2 += 4349 tp1->send_size; 4350 4351 /* update RTO too? */ 4352 if (tp1->do_rtt) { 4353 tp1->whoTo->RTO = 4354 /* 4355 * sa_ignore 4356 * NO_NULL_CHK 4357 */ 4358 sctp_calculate_rto(stcb, 4359 asoc, tp1->whoTo, 4360 &tp1->sent_rcv_time, 4361 sctp_align_safe_nocopy); 4362 tp1->do_rtt = 0; 4363 } 4364 } 4365 /* 4366 * CMT: CUCv2 algorithm. From the 4367 * cumack'd TSNs, for each TSN being 4368 * acked for the first time, set the 4369 * following variables for the 4370 * corresp destination. 4371 * new_pseudo_cumack will trigger a 4372 * cwnd update. 4373 * find_(rtx_)pseudo_cumack will 4374 * trigger search for the next 4375 * expected (rtx-)pseudo-cumack. 4376 */ 4377 tp1->whoTo->new_pseudo_cumack = 1; 4378 tp1->whoTo->find_pseudo_cumack = 1; 4379 tp1->whoTo->find_rtx_pseudo_cumack = 1; 4380 4381 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 4382 /* sa_ignore NO_NULL_CHK */ 4383 sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK); 4384 } 4385 } 4386 if (tp1->sent == SCTP_DATAGRAM_RESEND) { 4387 sctp_ucount_decr(asoc->sent_queue_retran_cnt); 4388 } 4389 if (tp1->rec.data.chunk_was_revoked) { 4390 /* deflate the cwnd */ 4391 tp1->whoTo->cwnd -= tp1->book_size; 4392 tp1->rec.data.chunk_was_revoked = 0; 4393 } 4394 tp1->sent = SCTP_DATAGRAM_ACKED; 4395 TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next); 4396 if (tp1->data) { 4397 /* sa_ignore NO_NULL_CHK */ 4398 sctp_free_bufspace(stcb, asoc, tp1, 1); 4399 sctp_m_freem(tp1->data); 4400 } 4401 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 4402 sctp_log_sack(asoc->last_acked_seq, 4403 cumack, 4404 tp1->rec.data.TSN_seq, 4405 0, 4406 0, 4407 SCTP_LOG_FREE_SENT); 4408 } 4409 tp1->data = NULL; 4410 asoc->sent_queue_cnt--; 4411 sctp_free_a_chunk(stcb, tp1); 4412 tp1 = tp2; 4413 } else { 4414 break; 4415 } 4416 } 4417 4418 } 4419 /* sa_ignore NO_NULL_CHK */ 4420 if (stcb->sctp_socket) { 4421 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4422 struct socket *so; 4423 4424 #endif 4425 4426 SOCKBUF_LOCK(&stcb->sctp_socket->so_snd); 4427 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) { 4428 /* sa_ignore NO_NULL_CHK */ 4429 sctp_wakeup_log(stcb, cumack, 1, SCTP_WAKESND_FROM_SACK); 4430 } 4431 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4432 so = SCTP_INP_SO(stcb->sctp_ep); 4433 atomic_add_int(&stcb->asoc.refcnt, 1); 4434 SCTP_TCB_UNLOCK(stcb); 4435 SCTP_SOCKET_LOCK(so, 1); 4436 SCTP_TCB_LOCK(stcb); 4437 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4438 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 4439 /* assoc was freed while we were unlocked */ 4440 SCTP_SOCKET_UNLOCK(so, 1); 4441 return; 4442 } 4443 #endif 4444 sctp_sowwakeup_locked(stcb->sctp_ep, stcb->sctp_socket); 4445 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4446 SCTP_SOCKET_UNLOCK(so, 1); 4447 #endif 4448 } else { 4449 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) { 4450 sctp_wakeup_log(stcb, cumack, 1, SCTP_NOWAKE_FROM_SACK); 4451 } 4452 } 4453 4454 /* JRS - Use the congestion control given in the CC module */ 4455 if (asoc->last_acked_seq != cumack) 4456 asoc->cc_functions.sctp_cwnd_update_after_sack(stcb, asoc, 1, 0, 0); 4457 4458 asoc->last_acked_seq = cumack; 4459 4460 if (TAILQ_EMPTY(&asoc->sent_queue)) { 4461 /* nothing left in-flight */ 4462 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4463 net->flight_size = 0; 4464 net->partial_bytes_acked = 0; 4465 } 4466 asoc->total_flight = 0; 4467 asoc->total_flight_count = 0; 4468 } 4469 /* ECN Nonce updates */ 4470 if (asoc->ecn_nonce_allowed) { 4471 if (asoc->nonce_sum_check) { 4472 if (nonce_sum_flag != ((asoc->nonce_sum_expect_base) & SCTP_SACK_NONCE_SUM)) { 4473 if (asoc->nonce_wait_for_ecne == 0) { 4474 struct sctp_tmit_chunk *lchk; 4475 4476 lchk = TAILQ_FIRST(&asoc->send_queue); 4477 asoc->nonce_wait_for_ecne = 1; 4478 if (lchk) { 4479 asoc->nonce_wait_tsn = lchk->rec.data.TSN_seq; 4480 } else { 4481 asoc->nonce_wait_tsn = asoc->sending_seq; 4482 } 4483 } else { 4484 if (compare_with_wrap(asoc->last_acked_seq, asoc->nonce_wait_tsn, MAX_TSN) || 4485 (asoc->last_acked_seq == asoc->nonce_wait_tsn)) { 4486 /* 4487 * Misbehaving peer. We need 4488 * to react to this guy 4489 */ 4490 asoc->ecn_allowed = 0; 4491 asoc->ecn_nonce_allowed = 0; 4492 } 4493 } 4494 } 4495 } else { 4496 /* See if Resynchronization Possible */ 4497 if (compare_with_wrap(asoc->last_acked_seq, asoc->nonce_resync_tsn, MAX_TSN)) { 4498 asoc->nonce_sum_check = 1; 4499 /* 4500 * now we must calculate what the base is. 4501 * We do this based on two things, we know 4502 * the total's for all the segments 4503 * gap-acked in the SACK (none), We also 4504 * know the SACK's nonce sum, its in 4505 * nonce_sum_flag. So we can build a truth 4506 * table to back-calculate the new value of 4507 * asoc->nonce_sum_expect_base: 4508 * 4509 * SACK-flag-Value Seg-Sums Base 0 0 0 4510 * 1 0 1 0 1 1 1 4511 * 1 0 4512 */ 4513 asoc->nonce_sum_expect_base = (0 ^ nonce_sum_flag) & SCTP_SACK_NONCE_SUM; 4514 } 4515 } 4516 } 4517 /* RWND update */ 4518 asoc->peers_rwnd = sctp_sbspace_sub(rwnd, 4519 (uint32_t) (asoc->total_flight + (asoc->sent_queue_cnt * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)))); 4520 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4521 /* SWS sender side engages */ 4522 asoc->peers_rwnd = 0; 4523 } 4524 if (asoc->peers_rwnd > old_rwnd) { 4525 win_probe_recovery = 1; 4526 } 4527 /* Now assure a timer where data is queued at */ 4528 again: 4529 j = 0; 4530 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4531 int to_ticks; 4532 4533 if (win_probe_recovery && (net->window_probe)) { 4534 win_probe_recovered = 1; 4535 /* 4536 * Find first chunk that was used with window probe 4537 * and clear the sent 4538 */ 4539 /* sa_ignore FREED_MEMORY */ 4540 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 4541 if (tp1->window_probe) { 4542 sctp_window_probe_recovery(stcb, asoc, net, tp1); 4543 break; 4544 } 4545 } 4546 } 4547 if (net->RTO == 0) { 4548 to_ticks = MSEC_TO_TICKS(stcb->asoc.initial_rto); 4549 } else { 4550 to_ticks = MSEC_TO_TICKS(net->RTO); 4551 } 4552 if (net->flight_size) { 4553 j++; 4554 (void)SCTP_OS_TIMER_START(&net->rxt_timer.timer, to_ticks, 4555 sctp_timeout_handler, &net->rxt_timer); 4556 if (net->window_probe) { 4557 net->window_probe = 0; 4558 } 4559 } else { 4560 if (net->window_probe) { 4561 /* 4562 * In window probes we must assure a timer 4563 * is still running there 4564 */ 4565 net->window_probe = 0; 4566 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { 4567 SCTP_OS_TIMER_START(&net->rxt_timer.timer, to_ticks, 4568 sctp_timeout_handler, &net->rxt_timer); 4569 } 4570 } else if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { 4571 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 4572 stcb, net, 4573 SCTP_FROM_SCTP_INDATA + SCTP_LOC_22); 4574 } 4575 if (SCTP_BASE_SYSCTL(sctp_early_fr)) { 4576 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) { 4577 SCTP_STAT_INCR(sctps_earlyfrstpidsck4); 4578 sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net, 4579 SCTP_FROM_SCTP_INDATA + SCTP_LOC_23); 4580 } 4581 } 4582 } 4583 } 4584 if ((j == 0) && 4585 (!TAILQ_EMPTY(&asoc->sent_queue)) && 4586 (asoc->sent_queue_retran_cnt == 0) && 4587 (win_probe_recovered == 0) && 4588 (done_once == 0)) { 4589 /* 4590 * huh, this should not happen unless all packets are 4591 * PR-SCTP and marked to skip of course. 4592 */ 4593 if (sctp_fs_audit(asoc)) { 4594 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4595 if (net->flight_size) { 4596 net->flight_size = 0; 4597 } 4598 } 4599 asoc->total_flight = 0; 4600 asoc->total_flight_count = 0; 4601 asoc->sent_queue_retran_cnt = 0; 4602 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 4603 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 4604 sctp_flight_size_increase(tp1); 4605 sctp_total_flight_increase(stcb, tp1); 4606 } else if (tp1->sent == SCTP_DATAGRAM_RESEND) { 4607 asoc->sent_queue_retran_cnt++; 4608 } 4609 } 4610 } 4611 done_once = 1; 4612 goto again; 4613 } 4614 /**********************************/ 4615 /* Now what about shutdown issues */ 4616 /**********************************/ 4617 if (TAILQ_EMPTY(&asoc->send_queue) && TAILQ_EMPTY(&asoc->sent_queue)) { 4618 /* nothing left on sendqueue.. consider done */ 4619 /* clean up */ 4620 if ((asoc->stream_queue_cnt == 1) && 4621 ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) || 4622 (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED)) && 4623 (asoc->locked_on_sending) 4624 ) { 4625 struct sctp_stream_queue_pending *sp; 4626 4627 /* 4628 * I may be in a state where we got all across.. but 4629 * cannot write more due to a shutdown... we abort 4630 * since the user did not indicate EOR in this case. 4631 * The sp will be cleaned during free of the asoc. 4632 */ 4633 sp = TAILQ_LAST(&((asoc->locked_on_sending)->outqueue), 4634 sctp_streamhead); 4635 if ((sp) && (sp->length == 0)) { 4636 /* Let cleanup code purge it */ 4637 if (sp->msg_is_complete) { 4638 asoc->stream_queue_cnt--; 4639 } else { 4640 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT; 4641 asoc->locked_on_sending = NULL; 4642 asoc->stream_queue_cnt--; 4643 } 4644 } 4645 } 4646 if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) && 4647 (asoc->stream_queue_cnt == 0)) { 4648 if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) { 4649 /* Need to abort here */ 4650 struct mbuf *oper; 4651 4652 abort_out_now: 4653 *abort_now = 1; 4654 /* XXX */ 4655 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)), 4656 0, M_DONTWAIT, 1, MT_DATA); 4657 if (oper) { 4658 struct sctp_paramhdr *ph; 4659 uint32_t *ippp; 4660 4661 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + 4662 sizeof(uint32_t); 4663 ph = mtod(oper, struct sctp_paramhdr *); 4664 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT); 4665 ph->param_length = htons(SCTP_BUF_LEN(oper)); 4666 ippp = (uint32_t *) (ph + 1); 4667 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_24); 4668 } 4669 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_24; 4670 sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_RESPONSE_TO_USER_REQ, oper, SCTP_SO_NOT_LOCKED); 4671 } else { 4672 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 4673 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 4674 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 4675 } 4676 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT); 4677 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 4678 sctp_stop_timers_for_shutdown(stcb); 4679 sctp_send_shutdown(stcb, 4680 stcb->asoc.primary_destination); 4681 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, 4682 stcb->sctp_ep, stcb, asoc->primary_destination); 4683 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 4684 stcb->sctp_ep, stcb, asoc->primary_destination); 4685 } 4686 } else if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) && 4687 (asoc->stream_queue_cnt == 0)) { 4688 if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) { 4689 goto abort_out_now; 4690 } 4691 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 4692 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 4693 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 4694 sctp_send_shutdown_ack(stcb, 4695 stcb->asoc.primary_destination); 4696 4697 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, 4698 stcb->sctp_ep, stcb, asoc->primary_destination); 4699 } 4700 } 4701 /*********************************************/ 4702 /* Here we perform PR-SCTP procedures */ 4703 /* (section 4.2) */ 4704 /*********************************************/ 4705 /* C1. update advancedPeerAckPoint */ 4706 if (compare_with_wrap(cumack, asoc->advanced_peer_ack_point, MAX_TSN)) { 4707 asoc->advanced_peer_ack_point = cumack; 4708 } 4709 /* PR-Sctp issues need to be addressed too */ 4710 if ((asoc->peer_supports_prsctp) && (asoc->pr_sctp_cnt > 0)) { 4711 struct sctp_tmit_chunk *lchk; 4712 uint32_t old_adv_peer_ack_point; 4713 4714 old_adv_peer_ack_point = asoc->advanced_peer_ack_point; 4715 lchk = sctp_try_advance_peer_ack_point(stcb, asoc); 4716 /* C3. See if we need to send a Fwd-TSN */ 4717 if (compare_with_wrap(asoc->advanced_peer_ack_point, cumack, 4718 MAX_TSN)) { 4719 /* 4720 * ISSUE with ECN, see FWD-TSN processing for notes 4721 * on issues that will occur when the ECN NONCE 4722 * stuff is put into SCTP for cross checking. 4723 */ 4724 if (compare_with_wrap(asoc->advanced_peer_ack_point, old_adv_peer_ack_point, 4725 MAX_TSN)) { 4726 send_forward_tsn(stcb, asoc); 4727 /* 4728 * ECN Nonce: Disable Nonce Sum check when 4729 * FWD TSN is sent and store resync tsn 4730 */ 4731 asoc->nonce_sum_check = 0; 4732 asoc->nonce_resync_tsn = asoc->advanced_peer_ack_point; 4733 } else if (lchk) { 4734 /* try to FR fwd-tsn's that get lost too */ 4735 lchk->rec.data.fwd_tsn_cnt++; 4736 if (lchk->rec.data.fwd_tsn_cnt > 3) { 4737 send_forward_tsn(stcb, asoc); 4738 lchk->rec.data.fwd_tsn_cnt = 0; 4739 } 4740 } 4741 } 4742 if (lchk) { 4743 /* Assure a timer is up */ 4744 sctp_timer_start(SCTP_TIMER_TYPE_SEND, 4745 stcb->sctp_ep, stcb, lchk->whoTo); 4746 } 4747 } 4748 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_RWND_LOGGING_ENABLE) { 4749 sctp_misc_ints(SCTP_SACK_RWND_UPDATE, 4750 rwnd, 4751 stcb->asoc.peers_rwnd, 4752 stcb->asoc.total_flight, 4753 stcb->asoc.total_output_queue_size); 4754 } 4755 } 4756 4757 void 4758 sctp_handle_sack(struct mbuf *m, int offset, 4759 struct sctp_sack_chunk *ch, struct sctp_tcb *stcb, 4760 struct sctp_nets *net_from, int *abort_now, int sack_len, uint32_t rwnd) 4761 { 4762 struct sctp_association *asoc; 4763 struct sctp_sack *sack; 4764 struct sctp_tmit_chunk *tp1, *tp2; 4765 uint32_t cum_ack, last_tsn, biggest_tsn_acked, biggest_tsn_newly_acked, 4766 this_sack_lowest_newack; 4767 uint32_t sav_cum_ack; 4768 uint16_t num_seg, num_dup; 4769 uint16_t wake_him = 0; 4770 unsigned int sack_length; 4771 uint32_t send_s = 0; 4772 long j; 4773 int accum_moved = 0; 4774 int will_exit_fast_recovery = 0; 4775 uint32_t a_rwnd, old_rwnd; 4776 int win_probe_recovery = 0; 4777 int win_probe_recovered = 0; 4778 struct sctp_nets *net = NULL; 4779 int nonce_sum_flag, ecn_seg_sums = 0; 4780 int done_once; 4781 uint8_t reneged_all = 0; 4782 uint8_t cmt_dac_flag; 4783 4784 /* 4785 * we take any chance we can to service our queues since we cannot 4786 * get awoken when the socket is read from :< 4787 */ 4788 /* 4789 * Now perform the actual SACK handling: 1) Verify that it is not an 4790 * old sack, if so discard. 2) If there is nothing left in the send 4791 * queue (cum-ack is equal to last acked) then you have a duplicate 4792 * too, update any rwnd change and verify no timers are running. 4793 * then return. 3) Process any new consequtive data i.e. cum-ack 4794 * moved process these first and note that it moved. 4) Process any 4795 * sack blocks. 5) Drop any acked from the queue. 6) Check for any 4796 * revoked blocks and mark. 7) Update the cwnd. 8) Nothing left, 4797 * sync up flightsizes and things, stop all timers and also check 4798 * for shutdown_pending state. If so then go ahead and send off the 4799 * shutdown. If in shutdown recv, send off the shutdown-ack and 4800 * start that timer, Ret. 9) Strike any non-acked things and do FR 4801 * procedure if needed being sure to set the FR flag. 10) Do pr-sctp 4802 * procedures. 11) Apply any FR penalties. 12) Assure we will SACK 4803 * if in shutdown_recv state. 4804 */ 4805 SCTP_TCB_LOCK_ASSERT(stcb); 4806 sack = &ch->sack; 4807 /* CMT DAC algo */ 4808 this_sack_lowest_newack = 0; 4809 j = 0; 4810 sack_length = (unsigned int)sack_len; 4811 /* ECN Nonce */ 4812 SCTP_STAT_INCR(sctps_slowpath_sack); 4813 nonce_sum_flag = ch->ch.chunk_flags & SCTP_SACK_NONCE_SUM; 4814 cum_ack = last_tsn = ntohl(sack->cum_tsn_ack); 4815 #ifdef SCTP_ASOCLOG_OF_TSNS 4816 stcb->asoc.cumack_log[stcb->asoc.cumack_log_at] = cum_ack; 4817 stcb->asoc.cumack_log_at++; 4818 if (stcb->asoc.cumack_log_at > SCTP_TSN_LOG_SIZE) { 4819 stcb->asoc.cumack_log_at = 0; 4820 } 4821 #endif 4822 num_seg = ntohs(sack->num_gap_ack_blks); 4823 a_rwnd = rwnd; 4824 4825 /* CMT DAC algo */ 4826 cmt_dac_flag = ch->ch.chunk_flags & SCTP_SACK_CMT_DAC; 4827 num_dup = ntohs(sack->num_dup_tsns); 4828 4829 old_rwnd = stcb->asoc.peers_rwnd; 4830 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4831 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4832 stcb->asoc.overall_error_count, 4833 0, 4834 SCTP_FROM_SCTP_INDATA, 4835 __LINE__); 4836 } 4837 stcb->asoc.overall_error_count = 0; 4838 asoc = &stcb->asoc; 4839 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 4840 sctp_log_sack(asoc->last_acked_seq, 4841 cum_ack, 4842 0, 4843 num_seg, 4844 num_dup, 4845 SCTP_LOG_NEW_SACK); 4846 } 4847 if ((num_dup) && (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_FR_LOGGING_ENABLE | SCTP_EARLYFR_LOGGING_ENABLE))) { 4848 int off_to_dup, iii; 4849 uint32_t *dupdata, dblock; 4850 4851 off_to_dup = (num_seg * sizeof(struct sctp_gap_ack_block)) + sizeof(struct sctp_sack_chunk); 4852 if ((off_to_dup + (num_dup * sizeof(uint32_t))) <= sack_length) { 4853 dupdata = (uint32_t *) sctp_m_getptr(m, off_to_dup, 4854 sizeof(uint32_t), (uint8_t *) & dblock); 4855 off_to_dup += sizeof(uint32_t); 4856 if (dupdata) { 4857 for (iii = 0; iii < num_dup; iii++) { 4858 sctp_log_fr(*dupdata, 0, 0, SCTP_FR_DUPED); 4859 dupdata = (uint32_t *) sctp_m_getptr(m, off_to_dup, 4860 sizeof(uint32_t), (uint8_t *) & dblock); 4861 if (dupdata == NULL) 4862 break; 4863 off_to_dup += sizeof(uint32_t); 4864 } 4865 } 4866 } else { 4867 SCTP_PRINTF("Size invalid offset to dups:%d number dups:%d sack_len:%d num gaps:%d\n", 4868 off_to_dup, num_dup, sack_length, num_seg); 4869 } 4870 } 4871 if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) { 4872 /* reality check */ 4873 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 4874 tp1 = TAILQ_LAST(&asoc->sent_queue, 4875 sctpchunk_listhead); 4876 send_s = tp1->rec.data.TSN_seq + 1; 4877 } else { 4878 send_s = asoc->sending_seq; 4879 } 4880 if (cum_ack == send_s || 4881 compare_with_wrap(cum_ack, send_s, MAX_TSN)) { 4882 #ifndef INVARIANTS 4883 struct mbuf *oper; 4884 4885 #endif 4886 #ifdef INVARIANTS 4887 hopeless_peer: 4888 panic("Impossible sack 1"); 4889 #else 4890 4891 4892 /* 4893 * no way, we have not even sent this TSN out yet. 4894 * Peer is hopelessly messed up with us. 4895 */ 4896 hopeless_peer: 4897 *abort_now = 1; 4898 /* XXX */ 4899 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)), 4900 0, M_DONTWAIT, 1, MT_DATA); 4901 if (oper) { 4902 struct sctp_paramhdr *ph; 4903 uint32_t *ippp; 4904 4905 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + 4906 sizeof(uint32_t); 4907 ph = mtod(oper, struct sctp_paramhdr *); 4908 ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 4909 ph->param_length = htons(SCTP_BUF_LEN(oper)); 4910 ippp = (uint32_t *) (ph + 1); 4911 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_25); 4912 } 4913 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_25; 4914 sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); 4915 return; 4916 #endif 4917 } 4918 } 4919 /**********************/ 4920 /* 1) check the range */ 4921 /**********************/ 4922 if (compare_with_wrap(asoc->last_acked_seq, last_tsn, MAX_TSN)) { 4923 /* acking something behind */ 4924 return; 4925 } 4926 sav_cum_ack = asoc->last_acked_seq; 4927 4928 /* update the Rwnd of the peer */ 4929 if (TAILQ_EMPTY(&asoc->sent_queue) && 4930 TAILQ_EMPTY(&asoc->send_queue) && 4931 (asoc->stream_queue_cnt == 0) 4932 ) { 4933 /* nothing left on send/sent and strmq */ 4934 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) { 4935 sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK, 4936 asoc->peers_rwnd, 0, 0, a_rwnd); 4937 } 4938 asoc->peers_rwnd = a_rwnd; 4939 if (asoc->sent_queue_retran_cnt) { 4940 asoc->sent_queue_retran_cnt = 0; 4941 } 4942 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4943 /* SWS sender side engages */ 4944 asoc->peers_rwnd = 0; 4945 } 4946 /* stop any timers */ 4947 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4948 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 4949 stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_26); 4950 if (SCTP_BASE_SYSCTL(sctp_early_fr)) { 4951 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) { 4952 SCTP_STAT_INCR(sctps_earlyfrstpidsck1); 4953 sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net, 4954 SCTP_FROM_SCTP_INDATA + SCTP_LOC_26); 4955 } 4956 } 4957 net->partial_bytes_acked = 0; 4958 net->flight_size = 0; 4959 } 4960 asoc->total_flight = 0; 4961 asoc->total_flight_count = 0; 4962 return; 4963 } 4964 /* 4965 * We init netAckSz and netAckSz2 to 0. These are used to track 2 4966 * things. The total byte count acked is tracked in netAckSz AND 4967 * netAck2 is used to track the total bytes acked that are un- 4968 * amibguious and were never retransmitted. We track these on a per 4969 * destination address basis. 4970 */ 4971 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4972 net->prev_cwnd = net->cwnd; 4973 net->net_ack = 0; 4974 net->net_ack2 = 0; 4975 4976 /* 4977 * CMT: Reset CUC and Fast recovery algo variables before 4978 * SACK processing 4979 */ 4980 net->new_pseudo_cumack = 0; 4981 net->will_exit_fast_recovery = 0; 4982 } 4983 /* process the new consecutive TSN first */ 4984 tp1 = TAILQ_FIRST(&asoc->sent_queue); 4985 while (tp1) { 4986 if (compare_with_wrap(last_tsn, tp1->rec.data.TSN_seq, 4987 MAX_TSN) || 4988 last_tsn == tp1->rec.data.TSN_seq) { 4989 if (tp1->sent != SCTP_DATAGRAM_UNSENT) { 4990 /* 4991 * ECN Nonce: Add the nonce to the sender's 4992 * nonce sum 4993 */ 4994 asoc->nonce_sum_expect_base += tp1->rec.data.ect_nonce; 4995 accum_moved = 1; 4996 if (tp1->sent < SCTP_DATAGRAM_ACKED) { 4997 /* 4998 * If it is less than ACKED, it is 4999 * now no-longer in flight. Higher 5000 * values may occur during marking 5001 */ 5002 if ((tp1->whoTo->dest_state & 5003 SCTP_ADDR_UNCONFIRMED) && 5004 (tp1->snd_count < 2)) { 5005 /* 5006 * If there was no retran 5007 * and the address is 5008 * un-confirmed and we sent 5009 * there and are now 5010 * sacked.. its confirmed, 5011 * mark it so. 5012 */ 5013 tp1->whoTo->dest_state &= 5014 ~SCTP_ADDR_UNCONFIRMED; 5015 } 5016 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 5017 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 5018 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_CA, 5019 tp1->whoTo->flight_size, 5020 tp1->book_size, 5021 (uintptr_t) tp1->whoTo, 5022 tp1->rec.data.TSN_seq); 5023 } 5024 sctp_flight_size_decrease(tp1); 5025 sctp_total_flight_decrease(stcb, tp1); 5026 } 5027 tp1->whoTo->net_ack += tp1->send_size; 5028 5029 /* CMT SFR and DAC algos */ 5030 this_sack_lowest_newack = tp1->rec.data.TSN_seq; 5031 tp1->whoTo->saw_newack = 1; 5032 5033 if (tp1->snd_count < 2) { 5034 /* 5035 * True non-retransmited 5036 * chunk 5037 */ 5038 tp1->whoTo->net_ack2 += 5039 tp1->send_size; 5040 5041 /* update RTO too? */ 5042 if (tp1->do_rtt) { 5043 tp1->whoTo->RTO = 5044 sctp_calculate_rto(stcb, 5045 asoc, tp1->whoTo, 5046 &tp1->sent_rcv_time, 5047 sctp_align_safe_nocopy); 5048 tp1->do_rtt = 0; 5049 } 5050 } 5051 /* 5052 * CMT: CUCv2 algorithm. From the 5053 * cumack'd TSNs, for each TSN being 5054 * acked for the first time, set the 5055 * following variables for the 5056 * corresp destination. 5057 * new_pseudo_cumack will trigger a 5058 * cwnd update. 5059 * find_(rtx_)pseudo_cumack will 5060 * trigger search for the next 5061 * expected (rtx-)pseudo-cumack. 5062 */ 5063 tp1->whoTo->new_pseudo_cumack = 1; 5064 tp1->whoTo->find_pseudo_cumack = 1; 5065 tp1->whoTo->find_rtx_pseudo_cumack = 1; 5066 5067 5068 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 5069 sctp_log_sack(asoc->last_acked_seq, 5070 cum_ack, 5071 tp1->rec.data.TSN_seq, 5072 0, 5073 0, 5074 SCTP_LOG_TSN_ACKED); 5075 } 5076 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 5077 sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK); 5078 } 5079 } 5080 if (tp1->sent == SCTP_DATAGRAM_RESEND) { 5081 sctp_ucount_decr(asoc->sent_queue_retran_cnt); 5082 #ifdef SCTP_AUDITING_ENABLED 5083 sctp_audit_log(0xB3, 5084 (asoc->sent_queue_retran_cnt & 0x000000ff)); 5085 #endif 5086 } 5087 if (tp1->rec.data.chunk_was_revoked) { 5088 /* deflate the cwnd */ 5089 tp1->whoTo->cwnd -= tp1->book_size; 5090 tp1->rec.data.chunk_was_revoked = 0; 5091 } 5092 tp1->sent = SCTP_DATAGRAM_ACKED; 5093 } 5094 } else { 5095 break; 5096 } 5097 tp1 = TAILQ_NEXT(tp1, sctp_next); 5098 } 5099 biggest_tsn_newly_acked = biggest_tsn_acked = last_tsn; 5100 /* always set this up to cum-ack */ 5101 asoc->this_sack_highest_gap = last_tsn; 5102 5103 /* Move offset up to point to gaps/dups */ 5104 offset += sizeof(struct sctp_sack_chunk); 5105 if (((num_seg * (sizeof(struct sctp_gap_ack_block))) + sizeof(struct sctp_sack_chunk)) > sack_length) { 5106 5107 /* skip corrupt segments */ 5108 goto skip_segments; 5109 } 5110 if (num_seg > 0) { 5111 5112 /* 5113 * CMT: SFR algo (and HTNA) - this_sack_highest_newack has 5114 * to be greater than the cumack. Also reset saw_newack to 0 5115 * for all dests. 5116 */ 5117 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 5118 net->saw_newack = 0; 5119 net->this_sack_highest_newack = last_tsn; 5120 } 5121 5122 /* 5123 * thisSackHighestGap will increase while handling NEW 5124 * segments this_sack_highest_newack will increase while 5125 * handling NEWLY ACKED chunks. this_sack_lowest_newack is 5126 * used for CMT DAC algo. saw_newack will also change. 5127 */ 5128 sctp_handle_segments(m, &offset, stcb, asoc, ch, last_tsn, 5129 &biggest_tsn_acked, &biggest_tsn_newly_acked, &this_sack_lowest_newack, 5130 num_seg, &ecn_seg_sums); 5131 5132 if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) { 5133 /* 5134 * validate the biggest_tsn_acked in the gap acks if 5135 * strict adherence is wanted. 5136 */ 5137 if ((biggest_tsn_acked == send_s) || 5138 (compare_with_wrap(biggest_tsn_acked, send_s, MAX_TSN))) { 5139 /* 5140 * peer is either confused or we are under 5141 * attack. We must abort. 5142 */ 5143 goto hopeless_peer; 5144 } 5145 } 5146 } 5147 skip_segments: 5148 /*******************************************/ 5149 /* cancel ALL T3-send timer if accum moved */ 5150 /*******************************************/ 5151 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off)) { 5152 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 5153 if (net->new_pseudo_cumack) 5154 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 5155 stcb, net, 5156 SCTP_FROM_SCTP_INDATA + SCTP_LOC_27); 5157 5158 } 5159 } else { 5160 if (accum_moved) { 5161 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 5162 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 5163 stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_28); 5164 } 5165 } 5166 } 5167 /********************************************/ 5168 /* drop the acked chunks from the sendqueue */ 5169 /********************************************/ 5170 asoc->last_acked_seq = cum_ack; 5171 5172 tp1 = TAILQ_FIRST(&asoc->sent_queue); 5173 if (tp1 == NULL) 5174 goto done_with_it; 5175 do { 5176 if (compare_with_wrap(tp1->rec.data.TSN_seq, cum_ack, 5177 MAX_TSN)) { 5178 break; 5179 } 5180 if (tp1->sent == SCTP_DATAGRAM_UNSENT) { 5181 /* no more sent on list */ 5182 printf("Warning, tp1->sent == %d and its now acked?\n", 5183 tp1->sent); 5184 } 5185 tp2 = TAILQ_NEXT(tp1, sctp_next); 5186 TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next); 5187 if (tp1->pr_sctp_on) { 5188 if (asoc->pr_sctp_cnt != 0) 5189 asoc->pr_sctp_cnt--; 5190 } 5191 if ((TAILQ_FIRST(&asoc->sent_queue) == NULL) && 5192 (asoc->total_flight > 0)) { 5193 #ifdef INVARIANTS 5194 panic("Warning flight size is postive and should be 0"); 5195 #else 5196 SCTP_PRINTF("Warning flight size incorrect should be 0 is %d\n", 5197 asoc->total_flight); 5198 #endif 5199 asoc->total_flight = 0; 5200 } 5201 if (tp1->data) { 5202 /* sa_ignore NO_NULL_CHK */ 5203 sctp_free_bufspace(stcb, asoc, tp1, 1); 5204 sctp_m_freem(tp1->data); 5205 if (asoc->peer_supports_prsctp && PR_SCTP_BUF_ENABLED(tp1->flags)) { 5206 asoc->sent_queue_cnt_removeable--; 5207 } 5208 } 5209 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 5210 sctp_log_sack(asoc->last_acked_seq, 5211 cum_ack, 5212 tp1->rec.data.TSN_seq, 5213 0, 5214 0, 5215 SCTP_LOG_FREE_SENT); 5216 } 5217 tp1->data = NULL; 5218 asoc->sent_queue_cnt--; 5219 sctp_free_a_chunk(stcb, tp1); 5220 wake_him++; 5221 tp1 = tp2; 5222 } while (tp1 != NULL); 5223 5224 done_with_it: 5225 /* sa_ignore NO_NULL_CHK */ 5226 if ((wake_him) && (stcb->sctp_socket)) { 5227 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5228 struct socket *so; 5229 5230 #endif 5231 SOCKBUF_LOCK(&stcb->sctp_socket->so_snd); 5232 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) { 5233 sctp_wakeup_log(stcb, cum_ack, wake_him, SCTP_WAKESND_FROM_SACK); 5234 } 5235 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5236 so = SCTP_INP_SO(stcb->sctp_ep); 5237 atomic_add_int(&stcb->asoc.refcnt, 1); 5238 SCTP_TCB_UNLOCK(stcb); 5239 SCTP_SOCKET_LOCK(so, 1); 5240 SCTP_TCB_LOCK(stcb); 5241 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5242 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 5243 /* assoc was freed while we were unlocked */ 5244 SCTP_SOCKET_UNLOCK(so, 1); 5245 return; 5246 } 5247 #endif 5248 sctp_sowwakeup_locked(stcb->sctp_ep, stcb->sctp_socket); 5249 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5250 SCTP_SOCKET_UNLOCK(so, 1); 5251 #endif 5252 } else { 5253 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) { 5254 sctp_wakeup_log(stcb, cum_ack, wake_him, SCTP_NOWAKE_FROM_SACK); 5255 } 5256 } 5257 5258 if (asoc->fast_retran_loss_recovery && accum_moved) { 5259 if (compare_with_wrap(asoc->last_acked_seq, 5260 asoc->fast_recovery_tsn, MAX_TSN) || 5261 asoc->last_acked_seq == asoc->fast_recovery_tsn) { 5262 /* Setup so we will exit RFC2582 fast recovery */ 5263 will_exit_fast_recovery = 1; 5264 } 5265 } 5266 /* 5267 * Check for revoked fragments: 5268 * 5269 * if Previous sack - Had no frags then we can't have any revoked if 5270 * Previous sack - Had frag's then - If we now have frags aka 5271 * num_seg > 0 call sctp_check_for_revoked() to tell if peer revoked 5272 * some of them. else - The peer revoked all ACKED fragments, since 5273 * we had some before and now we have NONE. 5274 */ 5275 5276 if (num_seg) 5277 sctp_check_for_revoked(stcb, asoc, cum_ack, biggest_tsn_acked); 5278 else if (asoc->saw_sack_with_frags) { 5279 int cnt_revoked = 0; 5280 5281 tp1 = TAILQ_FIRST(&asoc->sent_queue); 5282 if (tp1 != NULL) { 5283 /* Peer revoked all dg's marked or acked */ 5284 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 5285 if ((tp1->sent > SCTP_DATAGRAM_RESEND) && 5286 (tp1->sent < SCTP_FORWARD_TSN_SKIP)) { 5287 tp1->sent = SCTP_DATAGRAM_SENT; 5288 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 5289 sctp_misc_ints(SCTP_FLIGHT_LOG_UP_REVOKE, 5290 tp1->whoTo->flight_size, 5291 tp1->book_size, 5292 (uintptr_t) tp1->whoTo, 5293 tp1->rec.data.TSN_seq); 5294 } 5295 sctp_flight_size_increase(tp1); 5296 sctp_total_flight_increase(stcb, tp1); 5297 tp1->rec.data.chunk_was_revoked = 1; 5298 /* 5299 * To ensure that this increase in 5300 * flightsize, which is artificial, 5301 * does not throttle the sender, we 5302 * also increase the cwnd 5303 * artificially. 5304 */ 5305 tp1->whoTo->cwnd += tp1->book_size; 5306 cnt_revoked++; 5307 } 5308 } 5309 if (cnt_revoked) { 5310 reneged_all = 1; 5311 } 5312 } 5313 asoc->saw_sack_with_frags = 0; 5314 } 5315 if (num_seg) 5316 asoc->saw_sack_with_frags = 1; 5317 else 5318 asoc->saw_sack_with_frags = 0; 5319 5320 /* JRS - Use the congestion control given in the CC module */ 5321 asoc->cc_functions.sctp_cwnd_update_after_sack(stcb, asoc, accum_moved, reneged_all, will_exit_fast_recovery); 5322 5323 if (TAILQ_EMPTY(&asoc->sent_queue)) { 5324 /* nothing left in-flight */ 5325 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 5326 /* stop all timers */ 5327 if (SCTP_BASE_SYSCTL(sctp_early_fr)) { 5328 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) { 5329 SCTP_STAT_INCR(sctps_earlyfrstpidsck4); 5330 sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net, 5331 SCTP_FROM_SCTP_INDATA + SCTP_LOC_29); 5332 } 5333 } 5334 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 5335 stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_30); 5336 net->flight_size = 0; 5337 net->partial_bytes_acked = 0; 5338 } 5339 asoc->total_flight = 0; 5340 asoc->total_flight_count = 0; 5341 } 5342 /**********************************/ 5343 /* Now what about shutdown issues */ 5344 /**********************************/ 5345 if (TAILQ_EMPTY(&asoc->send_queue) && TAILQ_EMPTY(&asoc->sent_queue)) { 5346 /* nothing left on sendqueue.. consider done */ 5347 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) { 5348 sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK, 5349 asoc->peers_rwnd, 0, 0, a_rwnd); 5350 } 5351 asoc->peers_rwnd = a_rwnd; 5352 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 5353 /* SWS sender side engages */ 5354 asoc->peers_rwnd = 0; 5355 } 5356 /* clean up */ 5357 if ((asoc->stream_queue_cnt == 1) && 5358 ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) || 5359 (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED)) && 5360 (asoc->locked_on_sending) 5361 ) { 5362 struct sctp_stream_queue_pending *sp; 5363 5364 /* 5365 * I may be in a state where we got all across.. but 5366 * cannot write more due to a shutdown... we abort 5367 * since the user did not indicate EOR in this case. 5368 */ 5369 sp = TAILQ_LAST(&((asoc->locked_on_sending)->outqueue), 5370 sctp_streamhead); 5371 if ((sp) && (sp->length == 0)) { 5372 asoc->locked_on_sending = NULL; 5373 if (sp->msg_is_complete) { 5374 asoc->stream_queue_cnt--; 5375 } else { 5376 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT; 5377 asoc->stream_queue_cnt--; 5378 } 5379 } 5380 } 5381 if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) && 5382 (asoc->stream_queue_cnt == 0)) { 5383 if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) { 5384 /* Need to abort here */ 5385 struct mbuf *oper; 5386 5387 abort_out_now: 5388 *abort_now = 1; 5389 /* XXX */ 5390 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)), 5391 0, M_DONTWAIT, 1, MT_DATA); 5392 if (oper) { 5393 struct sctp_paramhdr *ph; 5394 uint32_t *ippp; 5395 5396 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + 5397 sizeof(uint32_t); 5398 ph = mtod(oper, struct sctp_paramhdr *); 5399 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT); 5400 ph->param_length = htons(SCTP_BUF_LEN(oper)); 5401 ippp = (uint32_t *) (ph + 1); 5402 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_31); 5403 } 5404 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_31; 5405 sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_RESPONSE_TO_USER_REQ, oper, SCTP_SO_NOT_LOCKED); 5406 return; 5407 } else { 5408 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 5409 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 5410 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 5411 } 5412 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT); 5413 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 5414 sctp_stop_timers_for_shutdown(stcb); 5415 sctp_send_shutdown(stcb, 5416 stcb->asoc.primary_destination); 5417 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, 5418 stcb->sctp_ep, stcb, asoc->primary_destination); 5419 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 5420 stcb->sctp_ep, stcb, asoc->primary_destination); 5421 } 5422 return; 5423 } else if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) && 5424 (asoc->stream_queue_cnt == 0)) { 5425 if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) { 5426 goto abort_out_now; 5427 } 5428 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 5429 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 5430 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 5431 sctp_send_shutdown_ack(stcb, 5432 stcb->asoc.primary_destination); 5433 5434 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, 5435 stcb->sctp_ep, stcb, asoc->primary_destination); 5436 return; 5437 } 5438 } 5439 /* 5440 * Now here we are going to recycle net_ack for a different use... 5441 * HEADS UP. 5442 */ 5443 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 5444 net->net_ack = 0; 5445 } 5446 5447 /* 5448 * CMT DAC algorithm: If SACK DAC flag was 0, then no extra marking 5449 * to be done. Setting this_sack_lowest_newack to the cum_ack will 5450 * automatically ensure that. 5451 */ 5452 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_use_dac) && (cmt_dac_flag == 0)) { 5453 this_sack_lowest_newack = cum_ack; 5454 } 5455 if (num_seg > 0) { 5456 sctp_strike_gap_ack_chunks(stcb, asoc, biggest_tsn_acked, 5457 biggest_tsn_newly_acked, this_sack_lowest_newack, accum_moved); 5458 } 5459 /* JRS - Use the congestion control given in the CC module */ 5460 asoc->cc_functions.sctp_cwnd_update_after_fr(stcb, asoc); 5461 5462 /****************************************************************** 5463 * Here we do the stuff with ECN Nonce checking. 5464 * We basically check to see if the nonce sum flag was incorrect 5465 * or if resynchronization needs to be done. Also if we catch a 5466 * misbehaving receiver we give him the kick. 5467 ******************************************************************/ 5468 5469 if (asoc->ecn_nonce_allowed) { 5470 if (asoc->nonce_sum_check) { 5471 if (nonce_sum_flag != ((asoc->nonce_sum_expect_base + ecn_seg_sums) & SCTP_SACK_NONCE_SUM)) { 5472 if (asoc->nonce_wait_for_ecne == 0) { 5473 struct sctp_tmit_chunk *lchk; 5474 5475 lchk = TAILQ_FIRST(&asoc->send_queue); 5476 asoc->nonce_wait_for_ecne = 1; 5477 if (lchk) { 5478 asoc->nonce_wait_tsn = lchk->rec.data.TSN_seq; 5479 } else { 5480 asoc->nonce_wait_tsn = asoc->sending_seq; 5481 } 5482 } else { 5483 if (compare_with_wrap(asoc->last_acked_seq, asoc->nonce_wait_tsn, MAX_TSN) || 5484 (asoc->last_acked_seq == asoc->nonce_wait_tsn)) { 5485 /* 5486 * Misbehaving peer. We need 5487 * to react to this guy 5488 */ 5489 asoc->ecn_allowed = 0; 5490 asoc->ecn_nonce_allowed = 0; 5491 } 5492 } 5493 } 5494 } else { 5495 /* See if Resynchronization Possible */ 5496 if (compare_with_wrap(asoc->last_acked_seq, asoc->nonce_resync_tsn, MAX_TSN)) { 5497 asoc->nonce_sum_check = 1; 5498 /* 5499 * now we must calculate what the base is. 5500 * We do this based on two things, we know 5501 * the total's for all the segments 5502 * gap-acked in the SACK, its stored in 5503 * ecn_seg_sums. We also know the SACK's 5504 * nonce sum, its in nonce_sum_flag. So we 5505 * can build a truth table to back-calculate 5506 * the new value of 5507 * asoc->nonce_sum_expect_base: 5508 * 5509 * SACK-flag-Value Seg-Sums Base 0 0 0 5510 * 1 0 1 0 1 1 1 5511 * 1 0 5512 */ 5513 asoc->nonce_sum_expect_base = (ecn_seg_sums ^ nonce_sum_flag) & SCTP_SACK_NONCE_SUM; 5514 } 5515 } 5516 } 5517 /* Now are we exiting loss recovery ? */ 5518 if (will_exit_fast_recovery) { 5519 /* Ok, we must exit fast recovery */ 5520 asoc->fast_retran_loss_recovery = 0; 5521 } 5522 if ((asoc->sat_t3_loss_recovery) && 5523 ((compare_with_wrap(asoc->last_acked_seq, asoc->sat_t3_recovery_tsn, 5524 MAX_TSN) || 5525 (asoc->last_acked_seq == asoc->sat_t3_recovery_tsn)))) { 5526 /* end satellite t3 loss recovery */ 5527 asoc->sat_t3_loss_recovery = 0; 5528 } 5529 /* 5530 * CMT Fast recovery 5531 */ 5532 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 5533 if (net->will_exit_fast_recovery) { 5534 /* Ok, we must exit fast recovery */ 5535 net->fast_retran_loss_recovery = 0; 5536 } 5537 } 5538 5539 /* Adjust and set the new rwnd value */ 5540 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) { 5541 sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK, 5542 asoc->peers_rwnd, asoc->total_flight, (asoc->sent_queue_cnt * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)), a_rwnd); 5543 } 5544 asoc->peers_rwnd = sctp_sbspace_sub(a_rwnd, 5545 (uint32_t) (asoc->total_flight + (asoc->sent_queue_cnt * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)))); 5546 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 5547 /* SWS sender side engages */ 5548 asoc->peers_rwnd = 0; 5549 } 5550 if (asoc->peers_rwnd > old_rwnd) { 5551 win_probe_recovery = 1; 5552 } 5553 /* 5554 * Now we must setup so we have a timer up for anyone with 5555 * outstanding data. 5556 */ 5557 done_once = 0; 5558 again: 5559 j = 0; 5560 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 5561 if (win_probe_recovery && (net->window_probe)) { 5562 win_probe_recovered = 1; 5563 /*- 5564 * Find first chunk that was used with 5565 * window probe and clear the event. Put 5566 * it back into the send queue as if has 5567 * not been sent. 5568 */ 5569 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 5570 if (tp1->window_probe) { 5571 sctp_window_probe_recovery(stcb, asoc, net, tp1); 5572 break; 5573 } 5574 } 5575 } 5576 if (net->flight_size) { 5577 j++; 5578 sctp_timer_start(SCTP_TIMER_TYPE_SEND, 5579 stcb->sctp_ep, stcb, net); 5580 if (net->window_probe) { 5581 } 5582 } else { 5583 if (net->window_probe) { 5584 /* 5585 * In window probes we must assure a timer 5586 * is still running there 5587 */ 5588 5589 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { 5590 sctp_timer_start(SCTP_TIMER_TYPE_SEND, 5591 stcb->sctp_ep, stcb, net); 5592 5593 } 5594 } else if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { 5595 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 5596 stcb, net, 5597 SCTP_FROM_SCTP_INDATA + SCTP_LOC_22); 5598 } 5599 if (SCTP_BASE_SYSCTL(sctp_early_fr)) { 5600 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) { 5601 SCTP_STAT_INCR(sctps_earlyfrstpidsck4); 5602 sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net, 5603 SCTP_FROM_SCTP_INDATA + SCTP_LOC_23); 5604 } 5605 } 5606 } 5607 } 5608 if ((j == 0) && 5609 (!TAILQ_EMPTY(&asoc->sent_queue)) && 5610 (asoc->sent_queue_retran_cnt == 0) && 5611 (win_probe_recovered == 0) && 5612 (done_once == 0)) { 5613 /* 5614 * huh, this should not happen unless all packets are 5615 * PR-SCTP and marked to skip of course. 5616 */ 5617 if (sctp_fs_audit(asoc)) { 5618 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 5619 net->flight_size = 0; 5620 } 5621 asoc->total_flight = 0; 5622 asoc->total_flight_count = 0; 5623 asoc->sent_queue_retran_cnt = 0; 5624 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 5625 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 5626 sctp_flight_size_increase(tp1); 5627 sctp_total_flight_increase(stcb, tp1); 5628 } else if (tp1->sent == SCTP_DATAGRAM_RESEND) { 5629 asoc->sent_queue_retran_cnt++; 5630 } 5631 } 5632 } 5633 done_once = 1; 5634 goto again; 5635 } 5636 /* Fix up the a-p-a-p for future PR-SCTP sends */ 5637 if (compare_with_wrap(cum_ack, asoc->advanced_peer_ack_point, MAX_TSN)) { 5638 asoc->advanced_peer_ack_point = cum_ack; 5639 } 5640 /* C2. try to further move advancedPeerAckPoint ahead */ 5641 if ((asoc->peer_supports_prsctp) && (asoc->pr_sctp_cnt > 0)) { 5642 struct sctp_tmit_chunk *lchk; 5643 uint32_t old_adv_peer_ack_point; 5644 5645 old_adv_peer_ack_point = asoc->advanced_peer_ack_point; 5646 lchk = sctp_try_advance_peer_ack_point(stcb, asoc); 5647 /* C3. See if we need to send a Fwd-TSN */ 5648 if (compare_with_wrap(asoc->advanced_peer_ack_point, cum_ack, 5649 MAX_TSN)) { 5650 /* 5651 * ISSUE with ECN, see FWD-TSN processing for notes 5652 * on issues that will occur when the ECN NONCE 5653 * stuff is put into SCTP for cross checking. 5654 */ 5655 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) { 5656 sctp_misc_ints(SCTP_FWD_TSN_CHECK, 5657 0xee, cum_ack, asoc->advanced_peer_ack_point, 5658 old_adv_peer_ack_point); 5659 } 5660 if (compare_with_wrap(asoc->advanced_peer_ack_point, old_adv_peer_ack_point, 5661 MAX_TSN)) { 5662 send_forward_tsn(stcb, asoc); 5663 /* 5664 * ECN Nonce: Disable Nonce Sum check when 5665 * FWD TSN is sent and store resync tsn 5666 */ 5667 asoc->nonce_sum_check = 0; 5668 asoc->nonce_resync_tsn = asoc->advanced_peer_ack_point; 5669 } else if (lchk) { 5670 /* try to FR fwd-tsn's that get lost too */ 5671 lchk->rec.data.fwd_tsn_cnt++; 5672 if (lchk->rec.data.fwd_tsn_cnt > 3) { 5673 send_forward_tsn(stcb, asoc); 5674 lchk->rec.data.fwd_tsn_cnt = 0; 5675 } 5676 } 5677 } 5678 if (lchk) { 5679 /* Assure a timer is up */ 5680 sctp_timer_start(SCTP_TIMER_TYPE_SEND, 5681 stcb->sctp_ep, stcb, lchk->whoTo); 5682 } 5683 } 5684 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_RWND_LOGGING_ENABLE) { 5685 sctp_misc_ints(SCTP_SACK_RWND_UPDATE, 5686 a_rwnd, 5687 stcb->asoc.peers_rwnd, 5688 stcb->asoc.total_flight, 5689 stcb->asoc.total_output_queue_size); 5690 } 5691 } 5692 5693 void 5694 sctp_update_acked(struct sctp_tcb *stcb, struct sctp_shutdown_chunk *cp, 5695 struct sctp_nets *netp, int *abort_flag) 5696 { 5697 /* Copy cum-ack */ 5698 uint32_t cum_ack, a_rwnd; 5699 5700 cum_ack = ntohl(cp->cumulative_tsn_ack); 5701 /* Arrange so a_rwnd does NOT change */ 5702 a_rwnd = stcb->asoc.peers_rwnd + stcb->asoc.total_flight; 5703 5704 /* Now call the express sack handling */ 5705 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 0, abort_flag); 5706 } 5707 5708 static void 5709 sctp_kick_prsctp_reorder_queue(struct sctp_tcb *stcb, 5710 struct sctp_stream_in *strmin) 5711 { 5712 struct sctp_queued_to_read *ctl, *nctl; 5713 struct sctp_association *asoc; 5714 int tt; 5715 5716 /* EY -used to calculate nr_gap information */ 5717 uint32_t nr_tsn, nr_gap; 5718 5719 asoc = &stcb->asoc; 5720 tt = strmin->last_sequence_delivered; 5721 /* 5722 * First deliver anything prior to and including the stream no that 5723 * came in 5724 */ 5725 ctl = TAILQ_FIRST(&strmin->inqueue); 5726 while (ctl) { 5727 nctl = TAILQ_NEXT(ctl, next); 5728 if (compare_with_wrap(tt, ctl->sinfo_ssn, MAX_SEQ) || 5729 (tt == ctl->sinfo_ssn)) { 5730 /* this is deliverable now */ 5731 TAILQ_REMOVE(&strmin->inqueue, ctl, next); 5732 /* subtract pending on streams */ 5733 asoc->size_on_all_streams -= ctl->length; 5734 sctp_ucount_decr(asoc->cnt_on_all_streams); 5735 /* deliver it to at least the delivery-q */ 5736 if (stcb->sctp_socket) { 5737 /* EY need the tsn info for calculating nr */ 5738 nr_tsn = ctl->sinfo_tsn; 5739 sctp_add_to_readq(stcb->sctp_ep, stcb, 5740 ctl, 5741 &stcb->sctp_socket->so_rcv, 1, SCTP_READ_LOCK_HELD, SCTP_SO_NOT_LOCKED); 5742 /* 5743 * EY this is the chunk that should be 5744 * tagged nr gapped calculate the gap and 5745 * such then tag this TSN nr 5746 * chk->rec.data.TSN_seq 5747 */ 5748 if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && asoc->peer_supports_nr_sack) { 5749 5750 SCTP_CALC_TSN_TO_GAP(nr_gap, nr_tsn, asoc->nr_mapping_array_base_tsn); 5751 if ((nr_gap >= (SCTP_NR_MAPPING_ARRAY << 3)) || 5752 (nr_gap >= (uint32_t) (asoc->nr_mapping_array_size << 3))) { 5753 /* 5754 * EY These should never 5755 * happen- explained before 5756 */ 5757 } else { 5758 SCTP_TCB_LOCK_ASSERT(stcb); 5759 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, nr_gap); 5760 SCTP_REVERSE_OUT_TSN_PRES(nr_gap, nr_tsn, asoc); 5761 if (compare_with_wrap(nr_tsn, 5762 asoc->highest_tsn_inside_nr_map, 5763 MAX_TSN)) 5764 asoc->highest_tsn_inside_nr_map = nr_tsn; 5765 } 5766 if (!SCTP_IS_TSN_PRESENT(asoc->mapping_array, nr_gap)) 5767 /* 5768 * printf("In 5769 * sctp_kick_prsctp_reorder_q 5770 * ueue(7): Something wrong, 5771 * the TSN to be tagged" 5772 * "\nas NR is not even in 5773 * the mapping_array, or map 5774 * and nr_map are 5775 * inconsistent"); 5776 */ 5777 /* 5778 * EY - not %100 sure about 5779 * the lock thing, don't 5780 * think its required 5781 */ 5782 /* 5783 * SCTP_TCB_LOCK_ASSERT(stcb) 5784 * ; 5785 */ 5786 { 5787 /* 5788 * printf("\nCalculating an 5789 * nr_gap!!\nmapping_array_si 5790 * ze = %d 5791 * nr_mapping_array_size = 5792 * %d" "\nmapping_array_base 5793 * = %d 5794 * nr_mapping_array_base = 5795 * %d\nhighest_tsn_inside_map 5796 * = %d" 5797 * "highest_tsn_inside_nr_map 5798 * = %d\nTSN = %d nr_gap = 5799 * %d",asoc->mapping_array_si 5800 * ze, 5801 * asoc->nr_mapping_array_siz 5802 * e, 5803 * asoc->mapping_array_base_t 5804 * sn, 5805 * asoc->nr_mapping_array_bas 5806 * e_tsn, 5807 * asoc->highest_tsn_inside_m 5808 * ap, 5809 * asoc->highest_tsn_inside_n 5810 * r_map,tsn,nr_gap); 5811 */ 5812 } 5813 } 5814 } 5815 } else { 5816 /* no more delivery now. */ 5817 break; 5818 } 5819 ctl = nctl; 5820 } 5821 /* 5822 * now we must deliver things in queue the normal way if any are 5823 * now ready. 5824 */ 5825 tt = strmin->last_sequence_delivered + 1; 5826 ctl = TAILQ_FIRST(&strmin->inqueue); 5827 while (ctl) { 5828 nctl = TAILQ_NEXT(ctl, next); 5829 if (tt == ctl->sinfo_ssn) { 5830 /* this is deliverable now */ 5831 TAILQ_REMOVE(&strmin->inqueue, ctl, next); 5832 /* subtract pending on streams */ 5833 asoc->size_on_all_streams -= ctl->length; 5834 sctp_ucount_decr(asoc->cnt_on_all_streams); 5835 /* deliver it to at least the delivery-q */ 5836 strmin->last_sequence_delivered = ctl->sinfo_ssn; 5837 if (stcb->sctp_socket) { 5838 /* EY */ 5839 nr_tsn = ctl->sinfo_tsn; 5840 sctp_add_to_readq(stcb->sctp_ep, stcb, 5841 ctl, 5842 &stcb->sctp_socket->so_rcv, 1, SCTP_READ_LOCK_HELD, SCTP_SO_NOT_LOCKED); 5843 /* 5844 * EY this is the chunk that should be 5845 * tagged nr gapped calculate the gap and 5846 * such then tag this TSN nr 5847 * chk->rec.data.TSN_seq 5848 */ 5849 if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && asoc->peer_supports_nr_sack) { 5850 SCTP_CALC_TSN_TO_GAP(nr_gap, nr_tsn, asoc->nr_mapping_array_base_tsn); 5851 if ((nr_gap >= (SCTP_NR_MAPPING_ARRAY << 3)) || 5852 (nr_gap >= (uint32_t) (asoc->nr_mapping_array_size << 3))) { 5853 /* 5854 * EY These should never 5855 * happen, explained before 5856 */ 5857 } else { 5858 SCTP_TCB_LOCK_ASSERT(stcb); 5859 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, nr_gap); 5860 SCTP_REVERSE_OUT_TSN_PRES(nr_gap, nr_tsn, asoc); 5861 if (compare_with_wrap(nr_tsn, asoc->highest_tsn_inside_nr_map, 5862 MAX_TSN)) 5863 asoc->highest_tsn_inside_nr_map = nr_tsn; 5864 } 5865 if (!SCTP_IS_TSN_PRESENT(asoc->mapping_array, nr_gap)) 5866 /* 5867 * printf("In 5868 * sctp_kick_prsctp_reorder_q 5869 * ueue(8): Something wrong, 5870 * the TSN to be tagged" 5871 * "\nas NR is not even in 5872 * the mapping_array, or map 5873 * and nr_map are 5874 * inconsistent"); 5875 */ 5876 /* 5877 * EY - not %100 sure about 5878 * the lock thing, don't 5879 * think its required 5880 */ 5881 /* 5882 * SCTP_TCB_LOCK_ASSERT(stcb) 5883 * ; 5884 */ 5885 { 5886 /* 5887 * printf("\nCalculating an 5888 * nr_gap!!\nmapping_array_si 5889 * ze = %d 5890 * nr_mapping_array_size = 5891 * %d" "\nmapping_array_base 5892 * = %d 5893 * nr_mapping_array_base = 5894 * %d\nhighest_tsn_inside_map 5895 * = %d" 5896 * "highest_tsn_inside_nr_map 5897 * = %d\nTSN = %d nr_gap = 5898 * %d",asoc->mapping_array_si 5899 * ze, 5900 * asoc->nr_mapping_array_siz 5901 * e, 5902 * asoc->mapping_array_base_t 5903 * sn, 5904 * asoc->nr_mapping_array_bas 5905 * e_tsn, 5906 * asoc->highest_tsn_inside_m 5907 * ap, 5908 * asoc->highest_tsn_inside_n 5909 * r_map,tsn,nr_gap); 5910 */ 5911 } 5912 } 5913 } 5914 tt = strmin->last_sequence_delivered + 1; 5915 } else { 5916 break; 5917 } 5918 ctl = nctl; 5919 } 5920 } 5921 5922 static void 5923 sctp_flush_reassm_for_str_seq(struct sctp_tcb *stcb, 5924 struct sctp_association *asoc, 5925 uint16_t stream, uint16_t seq) 5926 { 5927 struct sctp_tmit_chunk *chk, *at; 5928 5929 if (!TAILQ_EMPTY(&asoc->reasmqueue)) { 5930 /* For each one on here see if we need to toss it */ 5931 /* 5932 * For now large messages held on the reasmqueue that are 5933 * complete will be tossed too. We could in theory do more 5934 * work to spin through and stop after dumping one msg aka 5935 * seeing the start of a new msg at the head, and call the 5936 * delivery function... to see if it can be delivered... But 5937 * for now we just dump everything on the queue. 5938 */ 5939 chk = TAILQ_FIRST(&asoc->reasmqueue); 5940 while (chk) { 5941 at = TAILQ_NEXT(chk, sctp_next); 5942 /* 5943 * Do not toss it if on a different stream or marked 5944 * for unordered delivery in which case the stream 5945 * sequence number has no meaning. 5946 */ 5947 if ((chk->rec.data.stream_number != stream) || 5948 ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == SCTP_DATA_UNORDERED)) { 5949 chk = at; 5950 continue; 5951 } 5952 if (chk->rec.data.stream_seq == seq) { 5953 /* It needs to be tossed */ 5954 TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next); 5955 if (compare_with_wrap(chk->rec.data.TSN_seq, 5956 asoc->tsn_last_delivered, MAX_TSN)) { 5957 asoc->tsn_last_delivered = 5958 chk->rec.data.TSN_seq; 5959 asoc->str_of_pdapi = 5960 chk->rec.data.stream_number; 5961 asoc->ssn_of_pdapi = 5962 chk->rec.data.stream_seq; 5963 asoc->fragment_flags = 5964 chk->rec.data.rcv_flags; 5965 } 5966 asoc->size_on_reasm_queue -= chk->send_size; 5967 sctp_ucount_decr(asoc->cnt_on_reasm_queue); 5968 5969 /* Clear up any stream problem */ 5970 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) != 5971 SCTP_DATA_UNORDERED && 5972 (compare_with_wrap(chk->rec.data.stream_seq, 5973 asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered, 5974 MAX_SEQ))) { 5975 /* 5976 * We must dump forward this streams 5977 * sequence number if the chunk is 5978 * not unordered that is being 5979 * skipped. There is a chance that 5980 * if the peer does not include the 5981 * last fragment in its FWD-TSN we 5982 * WILL have a problem here since 5983 * you would have a partial chunk in 5984 * queue that may not be 5985 * deliverable. Also if a Partial 5986 * delivery API as started the user 5987 * may get a partial chunk. The next 5988 * read returning a new chunk... 5989 * really ugly but I see no way 5990 * around it! Maybe a notify?? 5991 */ 5992 asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered = 5993 chk->rec.data.stream_seq; 5994 } 5995 if (chk->data) { 5996 sctp_m_freem(chk->data); 5997 chk->data = NULL; 5998 } 5999 sctp_free_a_chunk(stcb, chk); 6000 } else if (compare_with_wrap(chk->rec.data.stream_seq, seq, MAX_SEQ)) { 6001 /* 6002 * If the stream_seq is > than the purging 6003 * one, we are done 6004 */ 6005 break; 6006 } 6007 chk = at; 6008 } 6009 } 6010 } 6011 6012 6013 void 6014 sctp_handle_forward_tsn(struct sctp_tcb *stcb, 6015 struct sctp_forward_tsn_chunk *fwd, int *abort_flag, struct mbuf *m, int offset) 6016 { 6017 /* 6018 * ISSUES that MUST be fixed for ECN! When we are the sender of the 6019 * forward TSN, when the SACK comes back that acknowledges the 6020 * FWD-TSN we must reset the NONCE sum to match correctly. This will 6021 * get quite tricky since we may have sent more data interveneing 6022 * and must carefully account for what the SACK says on the nonce 6023 * and any gaps that are reported. This work will NOT be done here, 6024 * but I note it here since it is really related to PR-SCTP and 6025 * FWD-TSN's 6026 */ 6027 6028 /* The pr-sctp fwd tsn */ 6029 /* 6030 * here we will perform all the data receiver side steps for 6031 * processing FwdTSN, as required in by pr-sctp draft: 6032 * 6033 * Assume we get FwdTSN(x): 6034 * 6035 * 1) update local cumTSN to x 2) try to further advance cumTSN to x + 6036 * others we have 3) examine and update re-ordering queue on 6037 * pr-in-streams 4) clean up re-assembly queue 5) Send a sack to 6038 * report where we are. 6039 */ 6040 struct sctp_association *asoc; 6041 uint32_t new_cum_tsn, gap; 6042 unsigned int i, fwd_sz, cumack_set_flag, m_size; 6043 uint32_t str_seq; 6044 struct sctp_stream_in *strm; 6045 struct sctp_tmit_chunk *chk, *at; 6046 struct sctp_queued_to_read *ctl, *sv; 6047 6048 cumack_set_flag = 0; 6049 asoc = &stcb->asoc; 6050 if ((fwd_sz = ntohs(fwd->ch.chunk_length)) < sizeof(struct sctp_forward_tsn_chunk)) { 6051 SCTPDBG(SCTP_DEBUG_INDATA1, 6052 "Bad size too small/big fwd-tsn\n"); 6053 return; 6054 } 6055 m_size = (stcb->asoc.mapping_array_size << 3); 6056 /*************************************************************/ 6057 /* 1. Here we update local cumTSN and shift the bitmap array */ 6058 /*************************************************************/ 6059 new_cum_tsn = ntohl(fwd->new_cumulative_tsn); 6060 6061 if (compare_with_wrap(asoc->cumulative_tsn, new_cum_tsn, MAX_TSN) || 6062 asoc->cumulative_tsn == new_cum_tsn) { 6063 /* Already got there ... */ 6064 return; 6065 } 6066 if (compare_with_wrap(new_cum_tsn, asoc->highest_tsn_inside_map, 6067 MAX_TSN)) { 6068 asoc->highest_tsn_inside_map = new_cum_tsn; 6069 /* EY nr_mapping_array version of the above */ 6070 /* 6071 * if(SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && 6072 * asoc->peer_supports_nr_sack) 6073 */ 6074 asoc->highest_tsn_inside_nr_map = new_cum_tsn; 6075 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 6076 sctp_log_map(0, 0, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 6077 } 6078 } 6079 /* 6080 * now we know the new TSN is more advanced, let's find the actual 6081 * gap 6082 */ 6083 SCTP_CALC_TSN_TO_GAP(gap, new_cum_tsn, asoc->mapping_array_base_tsn); 6084 if (gap >= m_size) { 6085 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 6086 sctp_log_map(0, 0, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 6087 } 6088 if ((long)gap > sctp_sbspace(&stcb->asoc, &stcb->sctp_socket->so_rcv)) { 6089 struct mbuf *oper; 6090 6091 /* 6092 * out of range (of single byte chunks in the rwnd I 6093 * give out). This must be an attacker. 6094 */ 6095 *abort_flag = 1; 6096 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 6097 0, M_DONTWAIT, 1, MT_DATA); 6098 if (oper) { 6099 struct sctp_paramhdr *ph; 6100 uint32_t *ippp; 6101 6102 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + 6103 (sizeof(uint32_t) * 3); 6104 ph = mtod(oper, struct sctp_paramhdr *); 6105 ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 6106 ph->param_length = htons(SCTP_BUF_LEN(oper)); 6107 ippp = (uint32_t *) (ph + 1); 6108 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_33); 6109 ippp++; 6110 *ippp = asoc->highest_tsn_inside_map; 6111 ippp++; 6112 *ippp = new_cum_tsn; 6113 } 6114 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_33; 6115 sctp_abort_an_association(stcb->sctp_ep, stcb, 6116 SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); 6117 return; 6118 } 6119 SCTP_STAT_INCR(sctps_fwdtsn_map_over); 6120 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 6121 cumack_set_flag = 1; 6122 asoc->mapping_array_base_tsn = new_cum_tsn + 1; 6123 asoc->cumulative_tsn = asoc->highest_tsn_inside_map = new_cum_tsn; 6124 /* EY - nr_sack: nr_mapping_array version of the above */ 6125 if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && asoc->peer_supports_nr_sack) { 6126 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.nr_mapping_array_size); 6127 asoc->nr_mapping_array_base_tsn = new_cum_tsn + 1; 6128 asoc->highest_tsn_inside_nr_map = new_cum_tsn; 6129 if (asoc->nr_mapping_array_size != asoc->mapping_array_size) { 6130 /* 6131 * printf("IN sctp_handle_forward_tsn: 6132 * Something is wrong the size of" "map and 6133 * nr_map should be equal!") 6134 */ ; 6135 } 6136 } 6137 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 6138 sctp_log_map(0, 3, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 6139 } 6140 asoc->last_echo_tsn = asoc->highest_tsn_inside_map; 6141 } else { 6142 SCTP_TCB_LOCK_ASSERT(stcb); 6143 for (i = 0; i <= gap; i++) { 6144 if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && asoc->peer_supports_nr_sack 6145 && SCTP_BASE_SYSCTL(sctp_do_drain) == 0) { 6146 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, i); 6147 } else { 6148 SCTP_SET_TSN_PRESENT(asoc->mapping_array, i); 6149 } 6150 } 6151 /* 6152 * Now after marking all, slide thing forward but no sack 6153 * please. 6154 */ 6155 sctp_sack_check(stcb, 0, 0, abort_flag); 6156 if (*abort_flag) 6157 return; 6158 } 6159 /*************************************************************/ 6160 /* 2. Clear up re-assembly queue */ 6161 /*************************************************************/ 6162 /* 6163 * First service it if pd-api is up, just in case we can progress it 6164 * forward 6165 */ 6166 if (asoc->fragmented_delivery_inprogress) { 6167 sctp_service_reassembly(stcb, asoc); 6168 } 6169 if (!TAILQ_EMPTY(&asoc->reasmqueue)) { 6170 /* For each one on here see if we need to toss it */ 6171 /* 6172 * For now large messages held on the reasmqueue that are 6173 * complete will be tossed too. We could in theory do more 6174 * work to spin through and stop after dumping one msg aka 6175 * seeing the start of a new msg at the head, and call the 6176 * delivery function... to see if it can be delivered... But 6177 * for now we just dump everything on the queue. 6178 */ 6179 chk = TAILQ_FIRST(&asoc->reasmqueue); 6180 while (chk) { 6181 at = TAILQ_NEXT(chk, sctp_next); 6182 if ((compare_with_wrap(new_cum_tsn, 6183 chk->rec.data.TSN_seq, MAX_TSN)) || 6184 (new_cum_tsn == chk->rec.data.TSN_seq)) { 6185 /* It needs to be tossed */ 6186 TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next); 6187 if (compare_with_wrap(chk->rec.data.TSN_seq, 6188 asoc->tsn_last_delivered, MAX_TSN)) { 6189 asoc->tsn_last_delivered = 6190 chk->rec.data.TSN_seq; 6191 asoc->str_of_pdapi = 6192 chk->rec.data.stream_number; 6193 asoc->ssn_of_pdapi = 6194 chk->rec.data.stream_seq; 6195 asoc->fragment_flags = 6196 chk->rec.data.rcv_flags; 6197 } 6198 asoc->size_on_reasm_queue -= chk->send_size; 6199 sctp_ucount_decr(asoc->cnt_on_reasm_queue); 6200 6201 /* Clear up any stream problem */ 6202 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) != 6203 SCTP_DATA_UNORDERED && 6204 (compare_with_wrap(chk->rec.data.stream_seq, 6205 asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered, 6206 MAX_SEQ))) { 6207 /* 6208 * We must dump forward this streams 6209 * sequence number if the chunk is 6210 * not unordered that is being 6211 * skipped. There is a chance that 6212 * if the peer does not include the 6213 * last fragment in its FWD-TSN we 6214 * WILL have a problem here since 6215 * you would have a partial chunk in 6216 * queue that may not be 6217 * deliverable. Also if a Partial 6218 * delivery API as started the user 6219 * may get a partial chunk. The next 6220 * read returning a new chunk... 6221 * really ugly but I see no way 6222 * around it! Maybe a notify?? 6223 */ 6224 asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered = 6225 chk->rec.data.stream_seq; 6226 } 6227 if (chk->data) { 6228 sctp_m_freem(chk->data); 6229 chk->data = NULL; 6230 } 6231 sctp_free_a_chunk(stcb, chk); 6232 } else { 6233 /* 6234 * Ok we have gone beyond the end of the 6235 * fwd-tsn's mark. 6236 */ 6237 break; 6238 } 6239 chk = at; 6240 } 6241 } 6242 /*******************************************************/ 6243 /* 3. Update the PR-stream re-ordering queues and fix */ 6244 /* delivery issues as needed. */ 6245 /*******************************************************/ 6246 fwd_sz -= sizeof(*fwd); 6247 if (m && fwd_sz) { 6248 /* New method. */ 6249 unsigned int num_str; 6250 struct sctp_strseq *stseq, strseqbuf; 6251 6252 offset += sizeof(*fwd); 6253 6254 SCTP_INP_READ_LOCK(stcb->sctp_ep); 6255 num_str = fwd_sz / sizeof(struct sctp_strseq); 6256 for (i = 0; i < num_str; i++) { 6257 uint16_t st; 6258 6259 stseq = (struct sctp_strseq *)sctp_m_getptr(m, offset, 6260 sizeof(struct sctp_strseq), 6261 (uint8_t *) & strseqbuf); 6262 offset += sizeof(struct sctp_strseq); 6263 if (stseq == NULL) { 6264 break; 6265 } 6266 /* Convert */ 6267 st = ntohs(stseq->stream); 6268 stseq->stream = st; 6269 st = ntohs(stseq->sequence); 6270 stseq->sequence = st; 6271 6272 /* now process */ 6273 6274 /* 6275 * Ok we now look for the stream/seq on the read 6276 * queue where its not all delivered. If we find it 6277 * we transmute the read entry into a PDI_ABORTED. 6278 */ 6279 if (stseq->stream >= asoc->streamincnt) { 6280 /* screwed up streams, stop! */ 6281 break; 6282 } 6283 if ((asoc->str_of_pdapi == stseq->stream) && 6284 (asoc->ssn_of_pdapi == stseq->sequence)) { 6285 /* 6286 * If this is the one we were partially 6287 * delivering now then we no longer are. 6288 * Note this will change with the reassembly 6289 * re-write. 6290 */ 6291 asoc->fragmented_delivery_inprogress = 0; 6292 } 6293 sctp_flush_reassm_for_str_seq(stcb, asoc, stseq->stream, stseq->sequence); 6294 TAILQ_FOREACH(ctl, &stcb->sctp_ep->read_queue, next) { 6295 if ((ctl->sinfo_stream == stseq->stream) && 6296 (ctl->sinfo_ssn == stseq->sequence)) { 6297 str_seq = (stseq->stream << 16) | stseq->sequence; 6298 ctl->end_added = 1; 6299 ctl->pdapi_aborted = 1; 6300 sv = stcb->asoc.control_pdapi; 6301 stcb->asoc.control_pdapi = ctl; 6302 sctp_ulp_notify(SCTP_NOTIFY_PARTIAL_DELVIERY_INDICATION, 6303 stcb, 6304 SCTP_PARTIAL_DELIVERY_ABORTED, 6305 (void *)&str_seq, 6306 SCTP_SO_NOT_LOCKED); 6307 stcb->asoc.control_pdapi = sv; 6308 break; 6309 } else if ((ctl->sinfo_stream == stseq->stream) && 6310 (compare_with_wrap(ctl->sinfo_ssn, stseq->sequence, MAX_SEQ))) { 6311 /* We are past our victim SSN */ 6312 break; 6313 } 6314 } 6315 strm = &asoc->strmin[stseq->stream]; 6316 if (compare_with_wrap(stseq->sequence, 6317 strm->last_sequence_delivered, MAX_SEQ)) { 6318 /* Update the sequence number */ 6319 strm->last_sequence_delivered = 6320 stseq->sequence; 6321 } 6322 /* now kick the stream the new way */ 6323 /* sa_ignore NO_NULL_CHK */ 6324 sctp_kick_prsctp_reorder_queue(stcb, strm); 6325 } 6326 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 6327 } 6328 if (TAILQ_FIRST(&asoc->reasmqueue)) { 6329 /* now lets kick out and check for more fragmented delivery */ 6330 /* sa_ignore NO_NULL_CHK */ 6331 sctp_deliver_reasm_check(stcb, &stcb->asoc); 6332 } 6333 } 6334 6335 /* EY fully identical to sctp_express_handle_sack, duplicated for only naming convention */ 6336 void 6337 sctp_express_handle_nr_sack(struct sctp_tcb *stcb, uint32_t cumack, 6338 uint32_t rwnd, int nonce_sum_flag, int *abort_now) 6339 { 6340 struct sctp_nets *net; 6341 struct sctp_association *asoc; 6342 struct sctp_tmit_chunk *tp1, *tp2; 6343 uint32_t old_rwnd; 6344 int win_probe_recovery = 0; 6345 int win_probe_recovered = 0; 6346 int j, done_once = 0; 6347 6348 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_SACK_ARRIVALS_ENABLE) { 6349 sctp_misc_ints(SCTP_SACK_LOG_EXPRESS, cumack, 6350 rwnd, stcb->asoc.last_acked_seq, stcb->asoc.peers_rwnd); 6351 } 6352 SCTP_TCB_LOCK_ASSERT(stcb); 6353 #ifdef SCTP_ASOCLOG_OF_TSNS 6354 stcb->asoc.cumack_log[stcb->asoc.cumack_log_at] = cumack; 6355 stcb->asoc.cumack_log_at++; 6356 if (stcb->asoc.cumack_log_at > SCTP_TSN_LOG_SIZE) { 6357 stcb->asoc.cumack_log_at = 0; 6358 } 6359 #endif 6360 asoc = &stcb->asoc; 6361 old_rwnd = asoc->peers_rwnd; 6362 if (compare_with_wrap(asoc->last_acked_seq, cumack, MAX_TSN)) { 6363 /* old ack */ 6364 return; 6365 } else if (asoc->last_acked_seq == cumack) { 6366 /* Window update sack */ 6367 asoc->peers_rwnd = sctp_sbspace_sub(rwnd, 6368 (uint32_t) (asoc->total_flight + (asoc->sent_queue_cnt * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)))); 6369 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 6370 /* SWS sender side engages */ 6371 asoc->peers_rwnd = 0; 6372 } 6373 if (asoc->peers_rwnd > old_rwnd) { 6374 goto again; 6375 } 6376 return; 6377 } 6378 /* First setup for CC stuff */ 6379 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 6380 net->prev_cwnd = net->cwnd; 6381 net->net_ack = 0; 6382 net->net_ack2 = 0; 6383 6384 /* 6385 * CMT: Reset CUC and Fast recovery algo variables before 6386 * SACK processing 6387 */ 6388 net->new_pseudo_cumack = 0; 6389 net->will_exit_fast_recovery = 0; 6390 } 6391 if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) { 6392 uint32_t send_s; 6393 6394 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 6395 tp1 = TAILQ_LAST(&asoc->sent_queue, 6396 sctpchunk_listhead); 6397 send_s = tp1->rec.data.TSN_seq + 1; 6398 } else { 6399 send_s = asoc->sending_seq; 6400 } 6401 if ((cumack == send_s) || 6402 compare_with_wrap(cumack, send_s, MAX_TSN)) { 6403 #ifndef INVARIANTS 6404 struct mbuf *oper; 6405 6406 #endif 6407 #ifdef INVARIANTS 6408 panic("Impossible sack 1"); 6409 #else 6410 *abort_now = 1; 6411 /* XXX */ 6412 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)), 6413 0, M_DONTWAIT, 1, MT_DATA); 6414 if (oper) { 6415 struct sctp_paramhdr *ph; 6416 uint32_t *ippp; 6417 6418 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + 6419 sizeof(uint32_t); 6420 ph = mtod(oper, struct sctp_paramhdr *); 6421 ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 6422 ph->param_length = htons(SCTP_BUF_LEN(oper)); 6423 ippp = (uint32_t *) (ph + 1); 6424 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_25); 6425 } 6426 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_25; 6427 sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); 6428 return; 6429 #endif 6430 } 6431 } 6432 asoc->this_sack_highest_gap = cumack; 6433 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 6434 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 6435 stcb->asoc.overall_error_count, 6436 0, 6437 SCTP_FROM_SCTP_INDATA, 6438 __LINE__); 6439 } 6440 stcb->asoc.overall_error_count = 0; 6441 if (compare_with_wrap(cumack, asoc->last_acked_seq, MAX_TSN)) { 6442 /* process the new consecutive TSN first */ 6443 tp1 = TAILQ_FIRST(&asoc->sent_queue); 6444 while (tp1) { 6445 tp2 = TAILQ_NEXT(tp1, sctp_next); 6446 if (compare_with_wrap(cumack, tp1->rec.data.TSN_seq, 6447 MAX_TSN) || 6448 cumack == tp1->rec.data.TSN_seq) { 6449 if (tp1->sent == SCTP_DATAGRAM_UNSENT) { 6450 printf("Warning, an unsent is now acked?\n"); 6451 } 6452 /* 6453 * ECN Nonce: Add the nonce to the sender's 6454 * nonce sum 6455 */ 6456 asoc->nonce_sum_expect_base += tp1->rec.data.ect_nonce; 6457 if (tp1->sent < SCTP_DATAGRAM_ACKED) { 6458 /* 6459 * If it is less than ACKED, it is 6460 * now no-longer in flight. Higher 6461 * values may occur during marking 6462 */ 6463 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 6464 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 6465 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_CA, 6466 tp1->whoTo->flight_size, 6467 tp1->book_size, 6468 (uintptr_t) tp1->whoTo, 6469 tp1->rec.data.TSN_seq); 6470 } 6471 sctp_flight_size_decrease(tp1); 6472 /* sa_ignore NO_NULL_CHK */ 6473 sctp_total_flight_decrease(stcb, tp1); 6474 } 6475 tp1->whoTo->net_ack += tp1->send_size; 6476 if (tp1->snd_count < 2) { 6477 /* 6478 * True non-retransmited 6479 * chunk 6480 */ 6481 tp1->whoTo->net_ack2 += 6482 tp1->send_size; 6483 6484 /* update RTO too? */ 6485 if (tp1->do_rtt) { 6486 tp1->whoTo->RTO = 6487 /* 6488 * sa_ignore 6489 * NO_NULL_CHK 6490 */ 6491 sctp_calculate_rto(stcb, 6492 asoc, tp1->whoTo, 6493 &tp1->sent_rcv_time, 6494 sctp_align_safe_nocopy); 6495 tp1->do_rtt = 0; 6496 } 6497 } 6498 /* 6499 * CMT: CUCv2 algorithm. From the 6500 * cumack'd TSNs, for each TSN being 6501 * acked for the first time, set the 6502 * following variables for the 6503 * corresp destination. 6504 * new_pseudo_cumack will trigger a 6505 * cwnd update. 6506 * find_(rtx_)pseudo_cumack will 6507 * trigger search for the next 6508 * expected (rtx-)pseudo-cumack. 6509 */ 6510 tp1->whoTo->new_pseudo_cumack = 1; 6511 tp1->whoTo->find_pseudo_cumack = 1; 6512 tp1->whoTo->find_rtx_pseudo_cumack = 1; 6513 6514 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 6515 /* sa_ignore NO_NULL_CHK */ 6516 sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK); 6517 } 6518 } 6519 if (tp1->sent == SCTP_DATAGRAM_RESEND) { 6520 sctp_ucount_decr(asoc->sent_queue_retran_cnt); 6521 } 6522 if (tp1->rec.data.chunk_was_revoked) { 6523 /* deflate the cwnd */ 6524 tp1->whoTo->cwnd -= tp1->book_size; 6525 tp1->rec.data.chunk_was_revoked = 0; 6526 } 6527 tp1->sent = SCTP_DATAGRAM_ACKED; 6528 TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next); 6529 if (tp1->data) { 6530 /* sa_ignore NO_NULL_CHK */ 6531 sctp_free_bufspace(stcb, asoc, tp1, 1); 6532 sctp_m_freem(tp1->data); 6533 } 6534 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 6535 sctp_log_sack(asoc->last_acked_seq, 6536 cumack, 6537 tp1->rec.data.TSN_seq, 6538 0, 6539 0, 6540 SCTP_LOG_FREE_SENT); 6541 } 6542 tp1->data = NULL; 6543 asoc->sent_queue_cnt--; 6544 sctp_free_a_chunk(stcb, tp1); 6545 tp1 = tp2; 6546 } else { 6547 break; 6548 } 6549 } 6550 6551 } 6552 /* sa_ignore NO_NULL_CHK */ 6553 if (stcb->sctp_socket) { 6554 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 6555 struct socket *so; 6556 6557 #endif 6558 6559 SOCKBUF_LOCK(&stcb->sctp_socket->so_snd); 6560 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) { 6561 /* sa_ignore NO_NULL_CHK */ 6562 sctp_wakeup_log(stcb, cumack, 1, SCTP_WAKESND_FROM_SACK); 6563 } 6564 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 6565 so = SCTP_INP_SO(stcb->sctp_ep); 6566 atomic_add_int(&stcb->asoc.refcnt, 1); 6567 SCTP_TCB_UNLOCK(stcb); 6568 SCTP_SOCKET_LOCK(so, 1); 6569 SCTP_TCB_LOCK(stcb); 6570 atomic_subtract_int(&stcb->asoc.refcnt, 1); 6571 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 6572 /* assoc was freed while we were unlocked */ 6573 SCTP_SOCKET_UNLOCK(so, 1); 6574 return; 6575 } 6576 #endif 6577 sctp_sowwakeup_locked(stcb->sctp_ep, stcb->sctp_socket); 6578 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 6579 SCTP_SOCKET_UNLOCK(so, 1); 6580 #endif 6581 } else { 6582 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) { 6583 sctp_wakeup_log(stcb, cumack, 1, SCTP_NOWAKE_FROM_SACK); 6584 } 6585 } 6586 6587 /* JRS - Use the congestion control given in the CC module */ 6588 if (asoc->last_acked_seq != cumack) 6589 asoc->cc_functions.sctp_cwnd_update_after_sack(stcb, asoc, 1, 0, 0); 6590 6591 asoc->last_acked_seq = cumack; 6592 6593 if (TAILQ_EMPTY(&asoc->sent_queue)) { 6594 /* nothing left in-flight */ 6595 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 6596 net->flight_size = 0; 6597 net->partial_bytes_acked = 0; 6598 } 6599 asoc->total_flight = 0; 6600 asoc->total_flight_count = 0; 6601 } 6602 /* Fix up the a-p-a-p for future PR-SCTP sends */ 6603 if (compare_with_wrap(cumack, asoc->advanced_peer_ack_point, MAX_TSN)) { 6604 asoc->advanced_peer_ack_point = cumack; 6605 } 6606 /* ECN Nonce updates */ 6607 if (asoc->ecn_nonce_allowed) { 6608 if (asoc->nonce_sum_check) { 6609 if (nonce_sum_flag != ((asoc->nonce_sum_expect_base) & SCTP_SACK_NONCE_SUM)) { 6610 if (asoc->nonce_wait_for_ecne == 0) { 6611 struct sctp_tmit_chunk *lchk; 6612 6613 lchk = TAILQ_FIRST(&asoc->send_queue); 6614 asoc->nonce_wait_for_ecne = 1; 6615 if (lchk) { 6616 asoc->nonce_wait_tsn = lchk->rec.data.TSN_seq; 6617 } else { 6618 asoc->nonce_wait_tsn = asoc->sending_seq; 6619 } 6620 } else { 6621 if (compare_with_wrap(asoc->last_acked_seq, asoc->nonce_wait_tsn, MAX_TSN) || 6622 (asoc->last_acked_seq == asoc->nonce_wait_tsn)) { 6623 /* 6624 * Misbehaving peer. We need 6625 * to react to this guy 6626 */ 6627 asoc->ecn_allowed = 0; 6628 asoc->ecn_nonce_allowed = 0; 6629 } 6630 } 6631 } 6632 } else { 6633 /* See if Resynchronization Possible */ 6634 if (compare_with_wrap(asoc->last_acked_seq, asoc->nonce_resync_tsn, MAX_TSN)) { 6635 asoc->nonce_sum_check = 1; 6636 /* 6637 * now we must calculate what the base is. 6638 * We do this based on two things, we know 6639 * the total's for all the segments 6640 * gap-acked in the SACK (none), We also 6641 * know the SACK's nonce sum, its in 6642 * nonce_sum_flag. So we can build a truth 6643 * table to back-calculate the new value of 6644 * asoc->nonce_sum_expect_base: 6645 * 6646 * SACK-flag-Value Seg-Sums Base 0 0 0 6647 * 1 0 1 0 1 1 1 1 0 6648 */ 6649 asoc->nonce_sum_expect_base = (0 ^ nonce_sum_flag) & SCTP_SACK_NONCE_SUM; 6650 } 6651 } 6652 } 6653 /* RWND update */ 6654 asoc->peers_rwnd = sctp_sbspace_sub(rwnd, 6655 (uint32_t) (asoc->total_flight + (asoc->sent_queue_cnt * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)))); 6656 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 6657 /* SWS sender side engages */ 6658 asoc->peers_rwnd = 0; 6659 } 6660 if (asoc->peers_rwnd > old_rwnd) { 6661 win_probe_recovery = 1; 6662 } 6663 /* Now assure a timer where data is queued at */ 6664 again: 6665 j = 0; 6666 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 6667 int to_ticks; 6668 6669 if (win_probe_recovery && (net->window_probe)) { 6670 win_probe_recovered = 1; 6671 /* 6672 * Find first chunk that was used with window probe 6673 * and clear the sent 6674 */ 6675 /* sa_ignore FREED_MEMORY */ 6676 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 6677 if (tp1->window_probe) { 6678 /* move back to data send queue */ 6679 sctp_window_probe_recovery(stcb, asoc, net, tp1); 6680 break; 6681 } 6682 } 6683 } 6684 if (net->RTO == 0) { 6685 to_ticks = MSEC_TO_TICKS(stcb->asoc.initial_rto); 6686 } else { 6687 to_ticks = MSEC_TO_TICKS(net->RTO); 6688 } 6689 if (net->flight_size) { 6690 6691 j++; 6692 (void)SCTP_OS_TIMER_START(&net->rxt_timer.timer, to_ticks, 6693 sctp_timeout_handler, &net->rxt_timer); 6694 if (net->window_probe) { 6695 net->window_probe = 0; 6696 } 6697 } else { 6698 if (net->window_probe) { 6699 /* 6700 * In window probes we must assure a timer 6701 * is still running there 6702 */ 6703 net->window_probe = 0; 6704 (void)SCTP_OS_TIMER_START(&net->rxt_timer.timer, to_ticks, 6705 sctp_timeout_handler, &net->rxt_timer); 6706 } else if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { 6707 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 6708 stcb, net, 6709 SCTP_FROM_SCTP_INDATA + SCTP_LOC_22); 6710 } 6711 if (SCTP_BASE_SYSCTL(sctp_early_fr)) { 6712 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) { 6713 SCTP_STAT_INCR(sctps_earlyfrstpidsck4); 6714 sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net, 6715 SCTP_FROM_SCTP_INDATA + SCTP_LOC_23); 6716 } 6717 } 6718 } 6719 } 6720 if ((j == 0) && 6721 (!TAILQ_EMPTY(&asoc->sent_queue)) && 6722 (asoc->sent_queue_retran_cnt == 0) && 6723 (win_probe_recovered == 0) && 6724 (done_once == 0)) { 6725 /* 6726 * huh, this should not happen unless all packets are 6727 * PR-SCTP and marked to skip of course. 6728 */ 6729 if (sctp_fs_audit(asoc)) { 6730 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 6731 net->flight_size = 0; 6732 } 6733 asoc->total_flight = 0; 6734 asoc->total_flight_count = 0; 6735 asoc->sent_queue_retran_cnt = 0; 6736 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 6737 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 6738 sctp_flight_size_increase(tp1); 6739 sctp_total_flight_increase(stcb, tp1); 6740 } else if (tp1->sent == SCTP_DATAGRAM_RESEND) { 6741 asoc->sent_queue_retran_cnt++; 6742 } 6743 } 6744 } 6745 done_once = 1; 6746 goto again; 6747 } 6748 /**********************************/ 6749 /* Now what about shutdown issues */ 6750 /**********************************/ 6751 if (TAILQ_EMPTY(&asoc->send_queue) && TAILQ_EMPTY(&asoc->sent_queue)) { 6752 /* nothing left on sendqueue.. consider done */ 6753 /* clean up */ 6754 if ((asoc->stream_queue_cnt == 1) && 6755 ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) || 6756 (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED)) && 6757 (asoc->locked_on_sending) 6758 ) { 6759 struct sctp_stream_queue_pending *sp; 6760 6761 /* 6762 * I may be in a state where we got all across.. but 6763 * cannot write more due to a shutdown... we abort 6764 * since the user did not indicate EOR in this case. 6765 * The sp will be cleaned during free of the asoc. 6766 */ 6767 sp = TAILQ_LAST(&((asoc->locked_on_sending)->outqueue), 6768 sctp_streamhead); 6769 if ((sp) && (sp->length == 0)) { 6770 /* Let cleanup code purge it */ 6771 if (sp->msg_is_complete) { 6772 asoc->stream_queue_cnt--; 6773 } else { 6774 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT; 6775 asoc->locked_on_sending = NULL; 6776 asoc->stream_queue_cnt--; 6777 } 6778 } 6779 } 6780 if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) && 6781 (asoc->stream_queue_cnt == 0)) { 6782 if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) { 6783 /* Need to abort here */ 6784 struct mbuf *oper; 6785 6786 abort_out_now: 6787 *abort_now = 1; 6788 /* XXX */ 6789 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)), 6790 0, M_DONTWAIT, 1, MT_DATA); 6791 if (oper) { 6792 struct sctp_paramhdr *ph; 6793 uint32_t *ippp; 6794 6795 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + 6796 sizeof(uint32_t); 6797 ph = mtod(oper, struct sctp_paramhdr *); 6798 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT); 6799 ph->param_length = htons(SCTP_BUF_LEN(oper)); 6800 ippp = (uint32_t *) (ph + 1); 6801 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_24); 6802 } 6803 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_24; 6804 sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_RESPONSE_TO_USER_REQ, oper, SCTP_SO_NOT_LOCKED); 6805 } else { 6806 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 6807 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 6808 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 6809 } 6810 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT); 6811 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 6812 sctp_stop_timers_for_shutdown(stcb); 6813 sctp_send_shutdown(stcb, 6814 stcb->asoc.primary_destination); 6815 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, 6816 stcb->sctp_ep, stcb, asoc->primary_destination); 6817 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 6818 stcb->sctp_ep, stcb, asoc->primary_destination); 6819 } 6820 } else if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) && 6821 (asoc->stream_queue_cnt == 0)) { 6822 if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) { 6823 goto abort_out_now; 6824 } 6825 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 6826 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 6827 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 6828 sctp_send_shutdown_ack(stcb, 6829 stcb->asoc.primary_destination); 6830 6831 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, 6832 stcb->sctp_ep, stcb, asoc->primary_destination); 6833 } 6834 } 6835 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_RWND_LOGGING_ENABLE) { 6836 sctp_misc_ints(SCTP_SACK_RWND_UPDATE, 6837 rwnd, 6838 stcb->asoc.peers_rwnd, 6839 stcb->asoc.total_flight, 6840 stcb->asoc.total_output_queue_size); 6841 } 6842 } 6843 6844 /* EY! nr_sack version of sctp_handle_segments, nr-gapped TSNs get removed from RtxQ in this method*/ 6845 static void 6846 sctp_handle_nr_sack_segments(struct mbuf *m, int *offset, struct sctp_tcb *stcb, struct sctp_association *asoc, 6847 struct sctp_nr_sack_chunk *ch, uint32_t last_tsn, uint32_t * biggest_tsn_acked, 6848 uint32_t * biggest_newly_acked_tsn, uint32_t * this_sack_lowest_newack, 6849 uint32_t num_seg, uint32_t num_nr_seg, int *ecn_seg_sums) 6850 { 6851 /************************************************/ 6852 /* process fragments and update sendqueue */ 6853 /************************************************/ 6854 struct sctp_nr_sack *nr_sack; 6855 struct sctp_gap_ack_block *frag, block; 6856 struct sctp_nr_gap_ack_block *nr_frag, nr_block; 6857 struct sctp_tmit_chunk *tp1; 6858 uint32_t i, j; 6859 int wake_him = 0; 6860 uint32_t theTSN; 6861 int num_frs = 0; 6862 6863 uint16_t frag_strt, frag_end, primary_flag_set; 6864 uint16_t nr_frag_strt, nr_frag_end; 6865 6866 uint32_t last_frag_high; 6867 uint32_t last_nr_frag_high; 6868 6869 /* 6870 * @@@ JRI : TODO: This flag is not used anywhere .. remove? 6871 */ 6872 if (asoc->primary_destination->dest_state & SCTP_ADDR_SWITCH_PRIMARY) { 6873 primary_flag_set = 1; 6874 } else { 6875 primary_flag_set = 0; 6876 } 6877 nr_sack = &ch->nr_sack; 6878 6879 /* 6880 * EY! - I will process nr_gaps similarly,by going to this position 6881 * again if All bit is set 6882 */ 6883 frag = (struct sctp_gap_ack_block *)sctp_m_getptr(m, *offset, 6884 sizeof(struct sctp_gap_ack_block), (uint8_t *) & block); 6885 *offset += sizeof(block); 6886 if (frag == NULL) { 6887 return; 6888 } 6889 tp1 = NULL; 6890 last_frag_high = 0; 6891 for (i = 0; i < num_seg; i++) { 6892 frag_strt = ntohs(frag->start); 6893 frag_end = ntohs(frag->end); 6894 /* some sanity checks on the fargment offsets */ 6895 if (frag_strt > frag_end) { 6896 /* this one is malformed, skip */ 6897 frag++; 6898 continue; 6899 } 6900 if (compare_with_wrap((frag_end + last_tsn), *biggest_tsn_acked, 6901 MAX_TSN)) 6902 *biggest_tsn_acked = frag_end + last_tsn; 6903 6904 /* mark acked dgs and find out the highestTSN being acked */ 6905 if (tp1 == NULL) { 6906 tp1 = TAILQ_FIRST(&asoc->sent_queue); 6907 6908 /* save the locations of the last frags */ 6909 last_frag_high = frag_end + last_tsn; 6910 } else { 6911 /* 6912 * now lets see if we need to reset the queue due to 6913 * a out-of-order SACK fragment 6914 */ 6915 if (compare_with_wrap(frag_strt + last_tsn, 6916 last_frag_high, MAX_TSN)) { 6917 /* 6918 * if the new frag starts after the last TSN 6919 * frag covered, we are ok and this one is 6920 * beyond the last one 6921 */ 6922 ; 6923 } else { 6924 /* 6925 * ok, they have reset us, so we need to 6926 * reset the queue this will cause extra 6927 * hunting but hey, they chose the 6928 * performance hit when they failed to order 6929 * there gaps.. 6930 */ 6931 tp1 = TAILQ_FIRST(&asoc->sent_queue); 6932 } 6933 last_frag_high = frag_end + last_tsn; 6934 } 6935 for (j = frag_strt; j <= frag_end; j++) { 6936 theTSN = j + last_tsn; 6937 while (tp1) { 6938 if (tp1->rec.data.doing_fast_retransmit) 6939 num_frs++; 6940 6941 /* 6942 * CMT: CUCv2 algorithm. For each TSN being 6943 * processed from the sent queue, track the 6944 * next expected pseudo-cumack, or 6945 * rtx_pseudo_cumack, if required. Separate 6946 * cumack trackers for first transmissions, 6947 * and retransmissions. 6948 */ 6949 if ((tp1->whoTo->find_pseudo_cumack == 1) && (tp1->sent < SCTP_DATAGRAM_RESEND) && 6950 (tp1->snd_count == 1)) { 6951 tp1->whoTo->pseudo_cumack = tp1->rec.data.TSN_seq; 6952 tp1->whoTo->find_pseudo_cumack = 0; 6953 } 6954 if ((tp1->whoTo->find_rtx_pseudo_cumack == 1) && (tp1->sent < SCTP_DATAGRAM_RESEND) && 6955 (tp1->snd_count > 1)) { 6956 tp1->whoTo->rtx_pseudo_cumack = tp1->rec.data.TSN_seq; 6957 tp1->whoTo->find_rtx_pseudo_cumack = 0; 6958 } 6959 if (tp1->rec.data.TSN_seq == theTSN) { 6960 if (tp1->sent != SCTP_DATAGRAM_UNSENT) { 6961 /* 6962 * must be held until 6963 * cum-ack passes 6964 */ 6965 /* 6966 * ECN Nonce: Add the nonce 6967 * value to the sender's 6968 * nonce sum 6969 */ 6970 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 6971 /*- 6972 * If it is less than RESEND, it is 6973 * now no-longer in flight. 6974 * Higher values may already be set 6975 * via previous Gap Ack Blocks... 6976 * i.e. ACKED or RESEND. 6977 */ 6978 if (compare_with_wrap(tp1->rec.data.TSN_seq, 6979 *biggest_newly_acked_tsn, MAX_TSN)) { 6980 *biggest_newly_acked_tsn = tp1->rec.data.TSN_seq; 6981 } 6982 /* 6983 * CMT: SFR algo 6984 * (and HTNA) - set 6985 * saw_newack to 1 6986 * for dest being 6987 * newly acked. 6988 * update 6989 * this_sack_highest_ 6990 * newack if 6991 * appropriate. 6992 */ 6993 if (tp1->rec.data.chunk_was_revoked == 0) 6994 tp1->whoTo->saw_newack = 1; 6995 6996 if (compare_with_wrap(tp1->rec.data.TSN_seq, 6997 tp1->whoTo->this_sack_highest_newack, 6998 MAX_TSN)) { 6999 tp1->whoTo->this_sack_highest_newack = 7000 tp1->rec.data.TSN_seq; 7001 } 7002 /* 7003 * CMT DAC algo: 7004 * also update 7005 * this_sack_lowest_n 7006 * ewack 7007 */ 7008 if (*this_sack_lowest_newack == 0) { 7009 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 7010 sctp_log_sack(*this_sack_lowest_newack, 7011 last_tsn, 7012 tp1->rec.data.TSN_seq, 7013 0, 7014 0, 7015 SCTP_LOG_TSN_ACKED); 7016 } 7017 *this_sack_lowest_newack = tp1->rec.data.TSN_seq; 7018 } 7019 /* 7020 * CMT: CUCv2 7021 * algorithm. If 7022 * (rtx-)pseudo-cumac 7023 * k for corresp 7024 * dest is being 7025 * acked, then we 7026 * have a new 7027 * (rtx-)pseudo-cumac 7028 * k. Set 7029 * new_(rtx_)pseudo_c 7030 * umack to TRUE so 7031 * that the cwnd for 7032 * this dest can be 7033 * updated. Also 7034 * trigger search 7035 * for the next 7036 * expected 7037 * (rtx-)pseudo-cumac 7038 * k. Separate 7039 * pseudo_cumack 7040 * trackers for 7041 * first 7042 * transmissions and 7043 * retransmissions. 7044 */ 7045 if (tp1->rec.data.TSN_seq == tp1->whoTo->pseudo_cumack) { 7046 if (tp1->rec.data.chunk_was_revoked == 0) { 7047 tp1->whoTo->new_pseudo_cumack = 1; 7048 } 7049 tp1->whoTo->find_pseudo_cumack = 1; 7050 } 7051 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 7052 sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK); 7053 } 7054 if (tp1->rec.data.TSN_seq == tp1->whoTo->rtx_pseudo_cumack) { 7055 if (tp1->rec.data.chunk_was_revoked == 0) { 7056 tp1->whoTo->new_pseudo_cumack = 1; 7057 } 7058 tp1->whoTo->find_rtx_pseudo_cumack = 1; 7059 } 7060 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 7061 sctp_log_sack(*biggest_newly_acked_tsn, 7062 last_tsn, 7063 tp1->rec.data.TSN_seq, 7064 frag_strt, 7065 frag_end, 7066 SCTP_LOG_TSN_ACKED); 7067 } 7068 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 7069 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_GAP, 7070 tp1->whoTo->flight_size, 7071 tp1->book_size, 7072 (uintptr_t) tp1->whoTo, 7073 tp1->rec.data.TSN_seq); 7074 } 7075 sctp_flight_size_decrease(tp1); 7076 sctp_total_flight_decrease(stcb, tp1); 7077 7078 tp1->whoTo->net_ack += tp1->send_size; 7079 if (tp1->snd_count < 2) { 7080 /* 7081 * True 7082 * non-retran 7083 * smited 7084 * chunk 7085 */ 7086 tp1->whoTo->net_ack2 += tp1->send_size; 7087 7088 /* 7089 * update 7090 * RTO too ? 7091 */ 7092 if (tp1->do_rtt) { 7093 tp1->whoTo->RTO = 7094 sctp_calculate_rto(stcb, 7095 asoc, 7096 tp1->whoTo, 7097 &tp1->sent_rcv_time, 7098 sctp_align_safe_nocopy); 7099 tp1->do_rtt = 0; 7100 } 7101 } 7102 } 7103 if (tp1->sent <= SCTP_DATAGRAM_RESEND) { 7104 (*ecn_seg_sums) += tp1->rec.data.ect_nonce; 7105 (*ecn_seg_sums) &= SCTP_SACK_NONCE_SUM; 7106 if (compare_with_wrap(tp1->rec.data.TSN_seq, 7107 asoc->this_sack_highest_gap, 7108 MAX_TSN)) { 7109 asoc->this_sack_highest_gap = 7110 tp1->rec.data.TSN_seq; 7111 } 7112 if (tp1->sent == SCTP_DATAGRAM_RESEND) { 7113 sctp_ucount_decr(asoc->sent_queue_retran_cnt); 7114 #ifdef SCTP_AUDITING_ENABLED 7115 sctp_audit_log(0xB2, 7116 (asoc->sent_queue_retran_cnt & 0x000000ff)); 7117 #endif 7118 } 7119 } 7120 /* 7121 * All chunks NOT UNSENT 7122 * fall through here and are 7123 * marked 7124 */ 7125 if (tp1->sent != SCTP_FORWARD_TSN_SKIP) 7126 tp1->sent = SCTP_DATAGRAM_NR_MARKED; 7127 if (tp1->rec.data.chunk_was_revoked) { 7128 /* deflate the cwnd */ 7129 tp1->whoTo->cwnd -= tp1->book_size; 7130 tp1->rec.data.chunk_was_revoked = 0; 7131 } 7132 } 7133 break; 7134 } /* if (tp1->TSN_seq == theTSN) */ 7135 if (compare_with_wrap(tp1->rec.data.TSN_seq, theTSN, 7136 MAX_TSN)) 7137 break; 7138 7139 tp1 = TAILQ_NEXT(tp1, sctp_next); 7140 } /* end while (tp1) */ 7141 } /* end for (j = fragStart */ 7142 frag = (struct sctp_gap_ack_block *)sctp_m_getptr(m, *offset, 7143 sizeof(struct sctp_gap_ack_block), (uint8_t *) & block); 7144 *offset += sizeof(block); 7145 if (frag == NULL) { 7146 break; 7147 } 7148 } 7149 7150 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 7151 if (num_frs) 7152 sctp_log_fr(*biggest_tsn_acked, 7153 *biggest_newly_acked_tsn, 7154 last_tsn, SCTP_FR_LOG_BIGGEST_TSNS); 7155 } 7156 nr_frag = (struct sctp_nr_gap_ack_block *)sctp_m_getptr(m, *offset, 7157 sizeof(struct sctp_nr_gap_ack_block), (uint8_t *) & nr_block); 7158 *offset += sizeof(nr_block); 7159 7160 7161 7162 if (nr_frag == NULL) { 7163 return; 7164 } 7165 tp1 = NULL; 7166 last_nr_frag_high = 0; 7167 7168 for (i = 0; i < num_nr_seg; i++) { 7169 7170 nr_frag_strt = ntohs(nr_frag->start); 7171 nr_frag_end = ntohs(nr_frag->end); 7172 7173 /* some sanity checks on the nr fargment offsets */ 7174 if (nr_frag_strt > nr_frag_end) { 7175 /* this one is malformed, skip */ 7176 nr_frag++; 7177 continue; 7178 } 7179 /* mark acked dgs and find out the highestTSN being acked */ 7180 if (tp1 == NULL) { 7181 tp1 = TAILQ_FIRST(&asoc->sent_queue); 7182 7183 /* save the locations of the last frags */ 7184 last_nr_frag_high = nr_frag_end + last_tsn; 7185 } else { 7186 /* 7187 * now lets see if we need to reset the queue due to 7188 * a out-of-order SACK fragment 7189 */ 7190 if (compare_with_wrap(nr_frag_strt + last_tsn, 7191 last_nr_frag_high, MAX_TSN)) { 7192 /* 7193 * if the new frag starts after the last TSN 7194 * frag covered, we are ok and this one is 7195 * beyond the last one 7196 */ 7197 ; 7198 } else { 7199 /* 7200 * ok, they have reset us, so we need to 7201 * reset the queue this will cause extra 7202 * hunting but hey, they chose the 7203 * performance hit when they failed to order 7204 * there gaps.. 7205 */ 7206 tp1 = TAILQ_FIRST(&asoc->sent_queue); 7207 } 7208 last_nr_frag_high = nr_frag_end + last_tsn; 7209 } 7210 7211 for (j = nr_frag_strt + last_tsn; (compare_with_wrap((nr_frag_end + last_tsn), j, MAX_TSN)); j++) { 7212 while (tp1) { 7213 if (tp1->rec.data.TSN_seq == j) { 7214 if (tp1->sent != SCTP_DATAGRAM_UNSENT) { 7215 if (tp1->sent != SCTP_FORWARD_TSN_SKIP) 7216 tp1->sent = SCTP_DATAGRAM_NR_MARKED; 7217 /* 7218 * TAILQ_REMOVE(&asoc->sent_q 7219 * ueue, tp1, sctp_next); 7220 */ 7221 if (tp1->data) { 7222 /* 7223 * sa_ignore 7224 * NO_NULL_CHK 7225 */ 7226 sctp_free_bufspace(stcb, asoc, tp1, 1); 7227 sctp_m_freem(tp1->data); 7228 } 7229 tp1->data = NULL; 7230 /* asoc->sent_queue_cnt--; */ 7231 /* 7232 * sctp_free_a_chunk(stcb, 7233 * tp1); 7234 */ 7235 wake_him++; 7236 } 7237 break; 7238 } /* if (tp1->TSN_seq == j) */ 7239 if (compare_with_wrap(tp1->rec.data.TSN_seq, j, 7240 MAX_TSN)) 7241 break; 7242 tp1 = TAILQ_NEXT(tp1, sctp_next); 7243 } /* end while (tp1) */ 7244 7245 } /* end for (j = nrFragStart */ 7246 7247 nr_frag = (struct sctp_nr_gap_ack_block *)sctp_m_getptr(m, *offset, 7248 sizeof(struct sctp_nr_gap_ack_block), (uint8_t *) & nr_block); 7249 *offset += sizeof(nr_block); 7250 if (nr_frag == NULL) { 7251 break; 7252 } 7253 } 7254 7255 /* 7256 * EY- wake up the socket if things have been removed from the sent 7257 * queue 7258 */ 7259 if ((wake_him) && (stcb->sctp_socket)) { 7260 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 7261 struct socket *so; 7262 7263 #endif 7264 SOCKBUF_LOCK(&stcb->sctp_socket->so_snd); 7265 /* 7266 * if (SCTP_BASE_SYSCTL(sctp_logging_level) & 7267 * SCTP_WAKE_LOGGING_ENABLE) { sctp_wakeup_log(stcb, 7268 * cum_ack, wake_him, SCTP_WAKESND_FROM_SACK);} 7269 */ 7270 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 7271 so = SCTP_INP_SO(stcb->sctp_ep); 7272 atomic_add_int(&stcb->asoc.refcnt, 1); 7273 SCTP_TCB_UNLOCK(stcb); 7274 SCTP_SOCKET_LOCK(so, 1); 7275 SCTP_TCB_LOCK(stcb); 7276 atomic_subtract_int(&stcb->asoc.refcnt, 1); 7277 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 7278 /* assoc was freed while we were unlocked */ 7279 SCTP_SOCKET_UNLOCK(so, 1); 7280 return; 7281 } 7282 #endif 7283 sctp_sowwakeup_locked(stcb->sctp_ep, stcb->sctp_socket); 7284 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 7285 SCTP_SOCKET_UNLOCK(so, 1); 7286 #endif 7287 } /* else { if 7288 * (SCTP_BASE_SYSCTL(sctp_logging_level) & 7289 * SCTP_WAKE_LOGGING_ENABLE) { 7290 * sctp_wakeup_log(stcb, cum_ack, wake_him, 7291 * SCTP_NOWAKE_FROM_SACK); } } */ 7292 } 7293 7294 /* EY- nr_sack */ 7295 /* Identifies the non-renegable tsns that are revoked*/ 7296 static void 7297 sctp_check_for_nr_revoked(struct sctp_tcb *stcb, 7298 struct sctp_association *asoc, uint32_t cumack, 7299 u_long biggest_tsn_acked) 7300 { 7301 struct sctp_tmit_chunk *tp1; 7302 7303 tp1 = TAILQ_FIRST(&asoc->sent_queue); 7304 while (tp1) { 7305 if (compare_with_wrap(tp1->rec.data.TSN_seq, cumack, 7306 MAX_TSN)) { 7307 /* 7308 * ok this guy is either ACK or MARKED. If it is 7309 * ACKED it has been previously acked but not this 7310 * time i.e. revoked. If it is MARKED it was ACK'ed 7311 * again. 7312 */ 7313 if (compare_with_wrap(tp1->rec.data.TSN_seq, biggest_tsn_acked, 7314 MAX_TSN)) 7315 break; 7316 7317 7318 if (tp1->sent == SCTP_DATAGRAM_NR_ACKED) { 7319 /* 7320 * EY! a non-renegable TSN is revoked, need 7321 * to abort the association 7322 */ 7323 /* 7324 * EY TODO: put in the code to abort the 7325 * assoc. 7326 */ 7327 return; 7328 } else if (tp1->sent == SCTP_DATAGRAM_NR_MARKED) { 7329 /* it has been re-acked in this SACK */ 7330 tp1->sent = SCTP_DATAGRAM_NR_ACKED; 7331 } 7332 } 7333 if (tp1->sent == SCTP_DATAGRAM_UNSENT) 7334 break; 7335 tp1 = TAILQ_NEXT(tp1, sctp_next); 7336 } 7337 } 7338 7339 /* EY! nr_sack version of sctp_handle_sack, nr_gap_ack processing should be added to this method*/ 7340 void 7341 sctp_handle_nr_sack(struct mbuf *m, int offset, 7342 struct sctp_nr_sack_chunk *ch, struct sctp_tcb *stcb, 7343 struct sctp_nets *net_from, int *abort_now, int nr_sack_len, uint32_t rwnd) 7344 { 7345 struct sctp_association *asoc; 7346 7347 /* EY sack */ 7348 struct sctp_nr_sack *nr_sack; 7349 struct sctp_tmit_chunk *tp1, *tp2; 7350 uint32_t cum_ack, last_tsn, biggest_tsn_acked, biggest_tsn_newly_acked, 7351 this_sack_lowest_newack; 7352 uint32_t sav_cum_ack; 7353 7354 /* EY num_seg */ 7355 uint16_t num_seg, num_nr_seg, num_dup; 7356 uint16_t wake_him = 0; 7357 unsigned int nr_sack_length; 7358 uint32_t send_s = 0; 7359 long j; 7360 int accum_moved = 0; 7361 int will_exit_fast_recovery = 0; 7362 uint32_t a_rwnd, old_rwnd; 7363 int win_probe_recovery = 0; 7364 int win_probe_recovered = 0; 7365 struct sctp_nets *net = NULL; 7366 int nonce_sum_flag, ecn_seg_sums = 0; 7367 int done_once; 7368 uint8_t reneged_all = 0; 7369 uint8_t cmt_dac_flag; 7370 7371 /* 7372 * we take any chance we can to service our queues since we cannot 7373 * get awoken when the socket is read from :< 7374 */ 7375 /* 7376 * Now perform the actual SACK handling: 1) Verify that it is not an 7377 * old sack, if so discard. 2) If there is nothing left in the send 7378 * queue (cum-ack is equal to last acked) then you have a duplicate 7379 * too, update any rwnd change and verify no timers are running. 7380 * then return. 3) Process any new consequtive data i.e. cum-ack 7381 * moved process these first and note that it moved. 4) Process any 7382 * sack blocks. 5) Drop any acked from the queue. 6) Check for any 7383 * revoked blocks and mark. 7) Update the cwnd. 8) Nothing left, 7384 * sync up flightsizes and things, stop all timers and also check 7385 * for shutdown_pending state. If so then go ahead and send off the 7386 * shutdown. If in shutdown recv, send off the shutdown-ack and 7387 * start that timer, Ret. 9) Strike any non-acked things and do FR 7388 * procedure if needed being sure to set the FR flag. 10) Do pr-sctp 7389 * procedures. 11) Apply any FR penalties. 12) Assure we will SACK 7390 * if in shutdown_recv state. 7391 */ 7392 SCTP_TCB_LOCK_ASSERT(stcb); 7393 nr_sack = &ch->nr_sack; 7394 /* CMT DAC algo */ 7395 this_sack_lowest_newack = 0; 7396 j = 0; 7397 nr_sack_length = (unsigned int)nr_sack_len; 7398 /* ECN Nonce */ 7399 SCTP_STAT_INCR(sctps_slowpath_sack); 7400 nonce_sum_flag = ch->ch.chunk_flags & SCTP_SACK_NONCE_SUM; 7401 cum_ack = last_tsn = ntohl(nr_sack->cum_tsn_ack); 7402 #ifdef SCTP_ASOCLOG_OF_TSNS 7403 stcb->asoc.cumack_log[stcb->asoc.cumack_log_at] = cum_ack; 7404 stcb->asoc.cumack_log_at++; 7405 if (stcb->asoc.cumack_log_at > SCTP_TSN_LOG_SIZE) { 7406 stcb->asoc.cumack_log_at = 0; 7407 } 7408 #endif 7409 num_seg = ntohs(nr_sack->num_gap_ack_blks); 7410 num_nr_seg = ntohs(nr_sack->num_nr_gap_ack_blks); 7411 a_rwnd = rwnd; 7412 7413 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_SACK_ARRIVALS_ENABLE) { 7414 sctp_misc_ints(SCTP_SACK_LOG_NORMAL, cum_ack, 7415 rwnd, stcb->asoc.last_acked_seq, stcb->asoc.peers_rwnd); 7416 } 7417 /* CMT DAC algo */ 7418 cmt_dac_flag = ch->ch.chunk_flags & SCTP_SACK_CMT_DAC; 7419 num_dup = ntohs(nr_sack->num_dup_tsns); 7420 7421 old_rwnd = stcb->asoc.peers_rwnd; 7422 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 7423 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 7424 stcb->asoc.overall_error_count, 7425 0, 7426 SCTP_FROM_SCTP_INDATA, 7427 __LINE__); 7428 } 7429 stcb->asoc.overall_error_count = 0; 7430 asoc = &stcb->asoc; 7431 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 7432 sctp_log_sack(asoc->last_acked_seq, 7433 cum_ack, 7434 0, 7435 num_seg, 7436 num_dup, 7437 SCTP_LOG_NEW_SACK); 7438 } 7439 if ((num_dup) && (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_FR_LOGGING_ENABLE | SCTP_EARLYFR_LOGGING_ENABLE))) { 7440 int off_to_dup, iii; 7441 uint32_t *dupdata, dblock; 7442 7443 off_to_dup = (num_seg * sizeof(struct sctp_gap_ack_block)) + 7444 (num_nr_seg * sizeof(struct sctp_nr_gap_ack_block)) + sizeof(struct sctp_nr_sack_chunk); 7445 if ((off_to_dup + (num_dup * sizeof(uint32_t))) <= nr_sack_length) { 7446 dupdata = (uint32_t *) sctp_m_getptr(m, off_to_dup, 7447 sizeof(uint32_t), (uint8_t *) & dblock); 7448 off_to_dup += sizeof(uint32_t); 7449 if (dupdata) { 7450 for (iii = 0; iii < num_dup; iii++) { 7451 sctp_log_fr(*dupdata, 0, 0, SCTP_FR_DUPED); 7452 dupdata = (uint32_t *) sctp_m_getptr(m, off_to_dup, 7453 sizeof(uint32_t), (uint8_t *) & dblock); 7454 if (dupdata == NULL) 7455 break; 7456 off_to_dup += sizeof(uint32_t); 7457 } 7458 } 7459 } else { 7460 SCTP_PRINTF("Size invalid offset to dups:%d number dups:%d nr_sack_len:%d num gaps:%d num nr_gaps:%d\n", 7461 off_to_dup, num_dup, nr_sack_length, num_seg, num_nr_seg); 7462 } 7463 } 7464 if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) { 7465 /* reality check */ 7466 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 7467 tp1 = TAILQ_LAST(&asoc->sent_queue, 7468 sctpchunk_listhead); 7469 send_s = tp1->rec.data.TSN_seq + 1; 7470 } else { 7471 send_s = asoc->sending_seq; 7472 } 7473 if (cum_ack == send_s || 7474 compare_with_wrap(cum_ack, send_s, MAX_TSN)) { 7475 #ifndef INVARIANTS 7476 struct mbuf *oper; 7477 7478 #endif 7479 #ifdef INVARIANTS 7480 hopeless_peer: 7481 panic("Impossible sack 1"); 7482 #else 7483 7484 7485 /* 7486 * no way, we have not even sent this TSN out yet. 7487 * Peer is hopelessly messed up with us. 7488 */ 7489 hopeless_peer: 7490 *abort_now = 1; 7491 /* XXX */ 7492 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)), 7493 0, M_DONTWAIT, 1, MT_DATA); 7494 if (oper) { 7495 struct sctp_paramhdr *ph; 7496 uint32_t *ippp; 7497 7498 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + 7499 sizeof(uint32_t); 7500 ph = mtod(oper, struct sctp_paramhdr *); 7501 ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 7502 ph->param_length = htons(SCTP_BUF_LEN(oper)); 7503 ippp = (uint32_t *) (ph + 1); 7504 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_25); 7505 } 7506 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_25; 7507 sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); 7508 return; 7509 #endif 7510 } 7511 } 7512 /**********************/ 7513 /* 1) check the range */ 7514 /**********************/ 7515 if (compare_with_wrap(asoc->last_acked_seq, last_tsn, MAX_TSN)) { 7516 /* acking something behind */ 7517 return; 7518 } 7519 sav_cum_ack = asoc->last_acked_seq; 7520 7521 /* update the Rwnd of the peer */ 7522 if (TAILQ_EMPTY(&asoc->sent_queue) && 7523 TAILQ_EMPTY(&asoc->send_queue) && 7524 (asoc->stream_queue_cnt == 0) 7525 ) { 7526 /* nothing left on send/sent and strmq */ 7527 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) { 7528 sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK, 7529 asoc->peers_rwnd, 0, 0, a_rwnd); 7530 } 7531 asoc->peers_rwnd = a_rwnd; 7532 if (asoc->sent_queue_retran_cnt) { 7533 asoc->sent_queue_retran_cnt = 0; 7534 } 7535 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 7536 /* SWS sender side engages */ 7537 asoc->peers_rwnd = 0; 7538 } 7539 /* stop any timers */ 7540 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 7541 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 7542 stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_26); 7543 if (SCTP_BASE_SYSCTL(sctp_early_fr)) { 7544 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) { 7545 SCTP_STAT_INCR(sctps_earlyfrstpidsck1); 7546 sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net, 7547 SCTP_FROM_SCTP_INDATA + SCTP_LOC_26); 7548 } 7549 } 7550 net->partial_bytes_acked = 0; 7551 net->flight_size = 0; 7552 } 7553 asoc->total_flight = 0; 7554 asoc->total_flight_count = 0; 7555 return; 7556 } 7557 /* 7558 * We init netAckSz and netAckSz2 to 0. These are used to track 2 7559 * things. The total byte count acked is tracked in netAckSz AND 7560 * netAck2 is used to track the total bytes acked that are un- 7561 * amibguious and were never retransmitted. We track these on a per 7562 * destination address basis. 7563 */ 7564 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 7565 net->prev_cwnd = net->cwnd; 7566 net->net_ack = 0; 7567 net->net_ack2 = 0; 7568 7569 /* 7570 * CMT: Reset CUC and Fast recovery algo variables before 7571 * SACK processing 7572 */ 7573 net->new_pseudo_cumack = 0; 7574 net->will_exit_fast_recovery = 0; 7575 } 7576 /* process the new consecutive TSN first */ 7577 tp1 = TAILQ_FIRST(&asoc->sent_queue); 7578 while (tp1) { 7579 if (compare_with_wrap(last_tsn, tp1->rec.data.TSN_seq, 7580 MAX_TSN) || 7581 last_tsn == tp1->rec.data.TSN_seq) { 7582 if (tp1->sent != SCTP_DATAGRAM_UNSENT) { 7583 /* 7584 * ECN Nonce: Add the nonce to the sender's 7585 * nonce sum 7586 */ 7587 asoc->nonce_sum_expect_base += tp1->rec.data.ect_nonce; 7588 accum_moved = 1; 7589 if (tp1->sent < SCTP_DATAGRAM_ACKED) { 7590 /* 7591 * If it is less than ACKED, it is 7592 * now no-longer in flight. Higher 7593 * values may occur during marking 7594 */ 7595 if ((tp1->whoTo->dest_state & 7596 SCTP_ADDR_UNCONFIRMED) && 7597 (tp1->snd_count < 2)) { 7598 /* 7599 * If there was no retran 7600 * and the address is 7601 * un-confirmed and we sent 7602 * there and are now 7603 * sacked.. its confirmed, 7604 * mark it so. 7605 */ 7606 tp1->whoTo->dest_state &= 7607 ~SCTP_ADDR_UNCONFIRMED; 7608 } 7609 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 7610 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 7611 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_CA, 7612 tp1->whoTo->flight_size, 7613 tp1->book_size, 7614 (uintptr_t) tp1->whoTo, 7615 tp1->rec.data.TSN_seq); 7616 } 7617 sctp_flight_size_decrease(tp1); 7618 sctp_total_flight_decrease(stcb, tp1); 7619 } 7620 tp1->whoTo->net_ack += tp1->send_size; 7621 7622 /* CMT SFR and DAC algos */ 7623 this_sack_lowest_newack = tp1->rec.data.TSN_seq; 7624 tp1->whoTo->saw_newack = 1; 7625 7626 if (tp1->snd_count < 2) { 7627 /* 7628 * True non-retransmited 7629 * chunk 7630 */ 7631 tp1->whoTo->net_ack2 += 7632 tp1->send_size; 7633 7634 /* update RTO too? */ 7635 if (tp1->do_rtt) { 7636 tp1->whoTo->RTO = 7637 sctp_calculate_rto(stcb, 7638 asoc, tp1->whoTo, 7639 &tp1->sent_rcv_time, 7640 sctp_align_safe_nocopy); 7641 tp1->do_rtt = 0; 7642 } 7643 } 7644 /* 7645 * CMT: CUCv2 algorithm. From the 7646 * cumack'd TSNs, for each TSN being 7647 * acked for the first time, set the 7648 * following variables for the 7649 * corresp destination. 7650 * new_pseudo_cumack will trigger a 7651 * cwnd update. 7652 * find_(rtx_)pseudo_cumack will 7653 * trigger search for the next 7654 * expected (rtx-)pseudo-cumack. 7655 */ 7656 tp1->whoTo->new_pseudo_cumack = 1; 7657 tp1->whoTo->find_pseudo_cumack = 1; 7658 tp1->whoTo->find_rtx_pseudo_cumack = 1; 7659 7660 7661 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 7662 sctp_log_sack(asoc->last_acked_seq, 7663 cum_ack, 7664 tp1->rec.data.TSN_seq, 7665 0, 7666 0, 7667 SCTP_LOG_TSN_ACKED); 7668 } 7669 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 7670 sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK); 7671 } 7672 } 7673 if (tp1->sent == SCTP_DATAGRAM_RESEND) { 7674 sctp_ucount_decr(asoc->sent_queue_retran_cnt); 7675 #ifdef SCTP_AUDITING_ENABLED 7676 sctp_audit_log(0xB3, 7677 (asoc->sent_queue_retran_cnt & 0x000000ff)); 7678 #endif 7679 } 7680 if (tp1->rec.data.chunk_was_revoked) { 7681 /* deflate the cwnd */ 7682 tp1->whoTo->cwnd -= tp1->book_size; 7683 tp1->rec.data.chunk_was_revoked = 0; 7684 } 7685 tp1->sent = SCTP_DATAGRAM_ACKED; 7686 } 7687 } else { 7688 break; 7689 } 7690 tp1 = TAILQ_NEXT(tp1, sctp_next); 7691 } 7692 biggest_tsn_newly_acked = biggest_tsn_acked = last_tsn; 7693 /* always set this up to cum-ack */ 7694 asoc->this_sack_highest_gap = last_tsn; 7695 7696 /* Move offset up to point to gaps/dups */ 7697 offset += sizeof(struct sctp_nr_sack_chunk); 7698 if (((num_seg * (sizeof(struct sctp_gap_ack_block))) + sizeof(struct sctp_nr_sack_chunk)) > nr_sack_length) { 7699 7700 /* skip corrupt segments */ 7701 goto skip_segments; 7702 } 7703 if (num_seg > 0) { 7704 7705 /* 7706 * CMT: SFR algo (and HTNA) - this_sack_highest_newack has 7707 * to be greater than the cumack. Also reset saw_newack to 0 7708 * for all dests. 7709 */ 7710 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 7711 net->saw_newack = 0; 7712 net->this_sack_highest_newack = last_tsn; 7713 } 7714 7715 /* 7716 * thisSackHighestGap will increase while handling NEW 7717 * segments this_sack_highest_newack will increase while 7718 * handling NEWLY ACKED chunks. this_sack_lowest_newack is 7719 * used for CMT DAC algo. saw_newack will also change. 7720 */ 7721 7722 sctp_handle_nr_sack_segments(m, &offset, stcb, asoc, ch, last_tsn, 7723 &biggest_tsn_acked, &biggest_tsn_newly_acked, &this_sack_lowest_newack, 7724 num_seg, num_nr_seg, &ecn_seg_sums); 7725 7726 7727 if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) { 7728 /* 7729 * validate the biggest_tsn_acked in the gap acks if 7730 * strict adherence is wanted. 7731 */ 7732 if ((biggest_tsn_acked == send_s) || 7733 (compare_with_wrap(biggest_tsn_acked, send_s, MAX_TSN))) { 7734 /* 7735 * peer is either confused or we are under 7736 * attack. We must abort. 7737 */ 7738 goto hopeless_peer; 7739 } 7740 } 7741 } 7742 skip_segments: 7743 /*******************************************/ 7744 /* cancel ALL T3-send timer if accum moved */ 7745 /*******************************************/ 7746 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off)) { 7747 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 7748 if (net->new_pseudo_cumack) 7749 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 7750 stcb, net, 7751 SCTP_FROM_SCTP_INDATA + SCTP_LOC_27); 7752 7753 } 7754 } else { 7755 if (accum_moved) { 7756 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 7757 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 7758 stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_28); 7759 } 7760 } 7761 } 7762 /********************************************/ 7763 /* drop the acked chunks from the sendqueue */ 7764 /********************************************/ 7765 asoc->last_acked_seq = cum_ack; 7766 7767 tp1 = TAILQ_FIRST(&asoc->sent_queue); 7768 if (tp1 == NULL) 7769 goto done_with_it; 7770 do { 7771 if (compare_with_wrap(tp1->rec.data.TSN_seq, cum_ack, 7772 MAX_TSN)) { 7773 break; 7774 } 7775 if (tp1->sent == SCTP_DATAGRAM_UNSENT) { 7776 /* no more sent on list */ 7777 printf("Warning, tp1->sent == %d and its now acked?\n", 7778 tp1->sent); 7779 } 7780 tp2 = TAILQ_NEXT(tp1, sctp_next); 7781 TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next); 7782 if (tp1->pr_sctp_on) { 7783 if (asoc->pr_sctp_cnt != 0) 7784 asoc->pr_sctp_cnt--; 7785 } 7786 if ((TAILQ_FIRST(&asoc->sent_queue) == NULL) && 7787 (asoc->total_flight > 0)) { 7788 #ifdef INVARIANTS 7789 panic("Warning flight size is postive and should be 0"); 7790 #else 7791 SCTP_PRINTF("Warning flight size incorrect should be 0 is %d\n", 7792 asoc->total_flight); 7793 #endif 7794 asoc->total_flight = 0; 7795 } 7796 if (tp1->data) { 7797 /* sa_ignore NO_NULL_CHK */ 7798 sctp_free_bufspace(stcb, asoc, tp1, 1); 7799 sctp_m_freem(tp1->data); 7800 if (asoc->peer_supports_prsctp && PR_SCTP_BUF_ENABLED(tp1->flags)) { 7801 asoc->sent_queue_cnt_removeable--; 7802 } 7803 } 7804 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 7805 sctp_log_sack(asoc->last_acked_seq, 7806 cum_ack, 7807 tp1->rec.data.TSN_seq, 7808 0, 7809 0, 7810 SCTP_LOG_FREE_SENT); 7811 } 7812 tp1->data = NULL; 7813 asoc->sent_queue_cnt--; 7814 sctp_free_a_chunk(stcb, tp1); 7815 wake_him++; 7816 tp1 = tp2; 7817 } while (tp1 != NULL); 7818 7819 done_with_it: 7820 /* sa_ignore NO_NULL_CHK */ 7821 if ((wake_him) && (stcb->sctp_socket)) { 7822 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 7823 struct socket *so; 7824 7825 #endif 7826 SOCKBUF_LOCK(&stcb->sctp_socket->so_snd); 7827 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) { 7828 sctp_wakeup_log(stcb, cum_ack, wake_him, SCTP_WAKESND_FROM_SACK); 7829 } 7830 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 7831 so = SCTP_INP_SO(stcb->sctp_ep); 7832 atomic_add_int(&stcb->asoc.refcnt, 1); 7833 SCTP_TCB_UNLOCK(stcb); 7834 SCTP_SOCKET_LOCK(so, 1); 7835 SCTP_TCB_LOCK(stcb); 7836 atomic_subtract_int(&stcb->asoc.refcnt, 1); 7837 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 7838 /* assoc was freed while we were unlocked */ 7839 SCTP_SOCKET_UNLOCK(so, 1); 7840 return; 7841 } 7842 #endif 7843 sctp_sowwakeup_locked(stcb->sctp_ep, stcb->sctp_socket); 7844 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 7845 SCTP_SOCKET_UNLOCK(so, 1); 7846 #endif 7847 } else { 7848 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) { 7849 sctp_wakeup_log(stcb, cum_ack, wake_him, SCTP_NOWAKE_FROM_SACK); 7850 } 7851 } 7852 7853 if (asoc->fast_retran_loss_recovery && accum_moved) { 7854 if (compare_with_wrap(asoc->last_acked_seq, 7855 asoc->fast_recovery_tsn, MAX_TSN) || 7856 asoc->last_acked_seq == asoc->fast_recovery_tsn) { 7857 /* Setup so we will exit RFC2582 fast recovery */ 7858 will_exit_fast_recovery = 1; 7859 } 7860 } 7861 /* 7862 * Check for revoked fragments: 7863 * 7864 * if Previous sack - Had no frags then we can't have any revoked if 7865 * Previous sack - Had frag's then - If we now have frags aka 7866 * num_seg > 0 call sctp_check_for_revoked() to tell if peer revoked 7867 * some of them. else - The peer revoked all ACKED fragments, since 7868 * we had some before and now we have NONE. 7869 */ 7870 7871 if (num_seg) 7872 sctp_check_for_revoked(stcb, asoc, cum_ack, biggest_tsn_acked); 7873 7874 else if (asoc->saw_sack_with_frags) { 7875 int cnt_revoked = 0; 7876 7877 tp1 = TAILQ_FIRST(&asoc->sent_queue); 7878 if (tp1 != NULL) { 7879 /* Peer revoked all dg's marked or acked */ 7880 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 7881 /* 7882 * EY- maybe check only if it is nr_acked 7883 * nr_marked may not be possible 7884 */ 7885 if ((tp1->sent == SCTP_DATAGRAM_NR_ACKED) || 7886 (tp1->sent == SCTP_DATAGRAM_NR_MARKED)) { 7887 /* 7888 * EY! - TODO: Something previously 7889 * nr_gapped is reneged, abort the 7890 * association 7891 */ 7892 return; 7893 } 7894 if ((tp1->sent > SCTP_DATAGRAM_RESEND) && 7895 (tp1->sent < SCTP_FORWARD_TSN_SKIP)) { 7896 tp1->sent = SCTP_DATAGRAM_SENT; 7897 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 7898 sctp_misc_ints(SCTP_FLIGHT_LOG_UP_REVOKE, 7899 tp1->whoTo->flight_size, 7900 tp1->book_size, 7901 (uintptr_t) tp1->whoTo, 7902 tp1->rec.data.TSN_seq); 7903 } 7904 sctp_flight_size_increase(tp1); 7905 sctp_total_flight_increase(stcb, tp1); 7906 tp1->rec.data.chunk_was_revoked = 1; 7907 /* 7908 * To ensure that this increase in 7909 * flightsize, which is artificial, 7910 * does not throttle the sender, we 7911 * also increase the cwnd 7912 * artificially. 7913 */ 7914 tp1->whoTo->cwnd += tp1->book_size; 7915 cnt_revoked++; 7916 } 7917 } 7918 if (cnt_revoked) { 7919 reneged_all = 1; 7920 } 7921 } 7922 asoc->saw_sack_with_frags = 0; 7923 } 7924 if (num_seg) 7925 asoc->saw_sack_with_frags = 1; 7926 else 7927 asoc->saw_sack_with_frags = 0; 7928 7929 /* EY! - not sure about if there should be an IF */ 7930 if (num_nr_seg) 7931 sctp_check_for_nr_revoked(stcb, asoc, cum_ack, biggest_tsn_acked); 7932 else if (asoc->saw_sack_with_nr_frags) { 7933 /* 7934 * EY!- TODO: all previously nr_gapped chunks have been 7935 * reneged abort the association 7936 */ 7937 asoc->saw_sack_with_nr_frags = 0; 7938 } 7939 if (num_nr_seg) 7940 asoc->saw_sack_with_nr_frags = 1; 7941 else 7942 asoc->saw_sack_with_nr_frags = 0; 7943 /* JRS - Use the congestion control given in the CC module */ 7944 asoc->cc_functions.sctp_cwnd_update_after_sack(stcb, asoc, accum_moved, reneged_all, will_exit_fast_recovery); 7945 7946 if (TAILQ_EMPTY(&asoc->sent_queue)) { 7947 /* nothing left in-flight */ 7948 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 7949 /* stop all timers */ 7950 if (SCTP_BASE_SYSCTL(sctp_early_fr)) { 7951 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) { 7952 SCTP_STAT_INCR(sctps_earlyfrstpidsck4); 7953 sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net, 7954 SCTP_FROM_SCTP_INDATA + SCTP_LOC_29); 7955 } 7956 } 7957 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 7958 stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_30); 7959 net->flight_size = 0; 7960 net->partial_bytes_acked = 0; 7961 } 7962 asoc->total_flight = 0; 7963 asoc->total_flight_count = 0; 7964 } 7965 /**********************************/ 7966 /* Now what about shutdown issues */ 7967 /**********************************/ 7968 if (TAILQ_EMPTY(&asoc->send_queue) && TAILQ_EMPTY(&asoc->sent_queue)) { 7969 /* nothing left on sendqueue.. consider done */ 7970 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) { 7971 sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK, 7972 asoc->peers_rwnd, 0, 0, a_rwnd); 7973 } 7974 asoc->peers_rwnd = a_rwnd; 7975 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 7976 /* SWS sender side engages */ 7977 asoc->peers_rwnd = 0; 7978 } 7979 /* clean up */ 7980 if ((asoc->stream_queue_cnt == 1) && 7981 ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) || 7982 (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED)) && 7983 (asoc->locked_on_sending) 7984 ) { 7985 struct sctp_stream_queue_pending *sp; 7986 7987 /* 7988 * I may be in a state where we got all across.. but 7989 * cannot write more due to a shutdown... we abort 7990 * since the user did not indicate EOR in this case. 7991 */ 7992 sp = TAILQ_LAST(&((asoc->locked_on_sending)->outqueue), 7993 sctp_streamhead); 7994 if ((sp) && (sp->length == 0)) { 7995 asoc->locked_on_sending = NULL; 7996 if (sp->msg_is_complete) { 7997 asoc->stream_queue_cnt--; 7998 } else { 7999 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT; 8000 asoc->stream_queue_cnt--; 8001 } 8002 } 8003 } 8004 if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) && 8005 (asoc->stream_queue_cnt == 0)) { 8006 if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) { 8007 /* Need to abort here */ 8008 struct mbuf *oper; 8009 8010 abort_out_now: 8011 *abort_now = 1; 8012 /* XXX */ 8013 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)), 8014 0, M_DONTWAIT, 1, MT_DATA); 8015 if (oper) { 8016 struct sctp_paramhdr *ph; 8017 uint32_t *ippp; 8018 8019 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + 8020 sizeof(uint32_t); 8021 ph = mtod(oper, struct sctp_paramhdr *); 8022 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT); 8023 ph->param_length = htons(SCTP_BUF_LEN(oper)); 8024 ippp = (uint32_t *) (ph + 1); 8025 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_31); 8026 } 8027 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_31; 8028 sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_RESPONSE_TO_USER_REQ, oper, SCTP_SO_NOT_LOCKED); 8029 return; 8030 } else { 8031 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 8032 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 8033 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 8034 } 8035 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT); 8036 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 8037 sctp_stop_timers_for_shutdown(stcb); 8038 sctp_send_shutdown(stcb, 8039 stcb->asoc.primary_destination); 8040 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, 8041 stcb->sctp_ep, stcb, asoc->primary_destination); 8042 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 8043 stcb->sctp_ep, stcb, asoc->primary_destination); 8044 } 8045 return; 8046 } else if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) && 8047 (asoc->stream_queue_cnt == 0)) { 8048 if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) { 8049 goto abort_out_now; 8050 } 8051 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 8052 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 8053 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 8054 sctp_send_shutdown_ack(stcb, 8055 stcb->asoc.primary_destination); 8056 8057 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, 8058 stcb->sctp_ep, stcb, asoc->primary_destination); 8059 return; 8060 } 8061 } 8062 /* 8063 * Now here we are going to recycle net_ack for a different use... 8064 * HEADS UP. 8065 */ 8066 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 8067 net->net_ack = 0; 8068 } 8069 8070 /* 8071 * CMT DAC algorithm: If SACK DAC flag was 0, then no extra marking 8072 * to be done. Setting this_sack_lowest_newack to the cum_ack will 8073 * automatically ensure that. 8074 */ 8075 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_use_dac) && (cmt_dac_flag == 0)) { 8076 this_sack_lowest_newack = cum_ack; 8077 } 8078 if (num_seg > 0) { 8079 sctp_strike_gap_ack_chunks(stcb, asoc, biggest_tsn_acked, 8080 biggest_tsn_newly_acked, this_sack_lowest_newack, accum_moved); 8081 } 8082 /* JRS - Use the congestion control given in the CC module */ 8083 asoc->cc_functions.sctp_cwnd_update_after_fr(stcb, asoc); 8084 8085 /****************************************************************** 8086 * Here we do the stuff with ECN Nonce checking. 8087 * We basically check to see if the nonce sum flag was incorrect 8088 * or if resynchronization needs to be done. Also if we catch a 8089 * misbehaving receiver we give him the kick. 8090 ******************************************************************/ 8091 8092 if (asoc->ecn_nonce_allowed) { 8093 if (asoc->nonce_sum_check) { 8094 if (nonce_sum_flag != ((asoc->nonce_sum_expect_base + ecn_seg_sums) & SCTP_SACK_NONCE_SUM)) { 8095 if (asoc->nonce_wait_for_ecne == 0) { 8096 struct sctp_tmit_chunk *lchk; 8097 8098 lchk = TAILQ_FIRST(&asoc->send_queue); 8099 asoc->nonce_wait_for_ecne = 1; 8100 if (lchk) { 8101 asoc->nonce_wait_tsn = lchk->rec.data.TSN_seq; 8102 } else { 8103 asoc->nonce_wait_tsn = asoc->sending_seq; 8104 } 8105 } else { 8106 if (compare_with_wrap(asoc->last_acked_seq, asoc->nonce_wait_tsn, MAX_TSN) || 8107 (asoc->last_acked_seq == asoc->nonce_wait_tsn)) { 8108 /* 8109 * Misbehaving peer. We need 8110 * to react to this guy 8111 */ 8112 asoc->ecn_allowed = 0; 8113 asoc->ecn_nonce_allowed = 0; 8114 } 8115 } 8116 } 8117 } else { 8118 /* See if Resynchronization Possible */ 8119 if (compare_with_wrap(asoc->last_acked_seq, asoc->nonce_resync_tsn, MAX_TSN)) { 8120 asoc->nonce_sum_check = 1; 8121 /* 8122 * now we must calculate what the base is. 8123 * We do this based on two things, we know 8124 * the total's for all the segments 8125 * gap-acked in the SACK, its stored in 8126 * ecn_seg_sums. We also know the SACK's 8127 * nonce sum, its in nonce_sum_flag. So we 8128 * can build a truth table to back-calculate 8129 * the new value of 8130 * asoc->nonce_sum_expect_base: 8131 * 8132 * SACK-flag-Value Seg-Sums Base 0 0 0 8133 * 1 0 1 0 1 1 1 1 0 8134 */ 8135 asoc->nonce_sum_expect_base = (ecn_seg_sums ^ nonce_sum_flag) & SCTP_SACK_NONCE_SUM; 8136 } 8137 } 8138 } 8139 /* Now are we exiting loss recovery ? */ 8140 if (will_exit_fast_recovery) { 8141 /* Ok, we must exit fast recovery */ 8142 asoc->fast_retran_loss_recovery = 0; 8143 } 8144 if ((asoc->sat_t3_loss_recovery) && 8145 ((compare_with_wrap(asoc->last_acked_seq, asoc->sat_t3_recovery_tsn, 8146 MAX_TSN) || 8147 (asoc->last_acked_seq == asoc->sat_t3_recovery_tsn)))) { 8148 /* end satellite t3 loss recovery */ 8149 asoc->sat_t3_loss_recovery = 0; 8150 } 8151 /* 8152 * CMT Fast recovery 8153 */ 8154 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 8155 if (net->will_exit_fast_recovery) { 8156 /* Ok, we must exit fast recovery */ 8157 net->fast_retran_loss_recovery = 0; 8158 } 8159 } 8160 8161 /* Adjust and set the new rwnd value */ 8162 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) { 8163 sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK, 8164 asoc->peers_rwnd, asoc->total_flight, (asoc->sent_queue_cnt * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)), a_rwnd); 8165 } 8166 asoc->peers_rwnd = sctp_sbspace_sub(a_rwnd, 8167 (uint32_t) (asoc->total_flight + (asoc->sent_queue_cnt * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)))); 8168 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 8169 /* SWS sender side engages */ 8170 asoc->peers_rwnd = 0; 8171 } 8172 if (asoc->peers_rwnd > old_rwnd) { 8173 win_probe_recovery = 1; 8174 } 8175 /* 8176 * Now we must setup so we have a timer up for anyone with 8177 * outstanding data. 8178 */ 8179 done_once = 0; 8180 again: 8181 j = 0; 8182 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 8183 if (win_probe_recovery && (net->window_probe)) { 8184 win_probe_recovered = 1; 8185 /*- 8186 * Find first chunk that was used with 8187 * window probe and clear the event. Put 8188 * it back into the send queue as if has 8189 * not been sent. 8190 */ 8191 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 8192 if (tp1->window_probe) { 8193 sctp_window_probe_recovery(stcb, asoc, net, tp1); 8194 break; 8195 } 8196 } 8197 } 8198 if (net->flight_size) { 8199 j++; 8200 sctp_timer_start(SCTP_TIMER_TYPE_SEND, 8201 stcb->sctp_ep, stcb, net); 8202 if (net->window_probe) { 8203 net->window_probe = 0; 8204 } 8205 } else { 8206 if (net->window_probe) { 8207 net->window_probe = 0; 8208 sctp_timer_start(SCTP_TIMER_TYPE_SEND, 8209 stcb->sctp_ep, stcb, net); 8210 } else if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { 8211 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 8212 stcb, net, 8213 SCTP_FROM_SCTP_INDATA + SCTP_LOC_22); 8214 } 8215 if (SCTP_BASE_SYSCTL(sctp_early_fr)) { 8216 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) { 8217 SCTP_STAT_INCR(sctps_earlyfrstpidsck4); 8218 sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net, 8219 SCTP_FROM_SCTP_INDATA + SCTP_LOC_23); 8220 } 8221 } 8222 } 8223 } 8224 if ((j == 0) && 8225 (!TAILQ_EMPTY(&asoc->sent_queue)) && 8226 (asoc->sent_queue_retran_cnt == 0) && 8227 (win_probe_recovered == 0) && 8228 (done_once == 0)) { 8229 /* 8230 * huh, this should not happen unless all packets are 8231 * PR-SCTP and marked to skip of course. 8232 */ 8233 if (sctp_fs_audit(asoc)) { 8234 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 8235 net->flight_size = 0; 8236 } 8237 asoc->total_flight = 0; 8238 asoc->total_flight_count = 0; 8239 asoc->sent_queue_retran_cnt = 0; 8240 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 8241 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 8242 sctp_flight_size_increase(tp1); 8243 sctp_total_flight_increase(stcb, tp1); 8244 } else if (tp1->sent == SCTP_DATAGRAM_RESEND) { 8245 asoc->sent_queue_retran_cnt++; 8246 } 8247 } 8248 } 8249 done_once = 1; 8250 goto again; 8251 } 8252 /*********************************************/ 8253 /* Here we perform PR-SCTP procedures */ 8254 /* (section 4.2) */ 8255 /*********************************************/ 8256 /* C1. update advancedPeerAckPoint */ 8257 if (compare_with_wrap(cum_ack, asoc->advanced_peer_ack_point, MAX_TSN)) { 8258 asoc->advanced_peer_ack_point = cum_ack; 8259 } 8260 /* C2. try to further move advancedPeerAckPoint ahead */ 8261 if ((asoc->peer_supports_prsctp) && (asoc->pr_sctp_cnt > 0)) { 8262 struct sctp_tmit_chunk *lchk; 8263 uint32_t old_adv_peer_ack_point; 8264 8265 old_adv_peer_ack_point = asoc->advanced_peer_ack_point; 8266 lchk = sctp_try_advance_peer_ack_point(stcb, asoc); 8267 /* C3. See if we need to send a Fwd-TSN */ 8268 if (compare_with_wrap(asoc->advanced_peer_ack_point, cum_ack, 8269 MAX_TSN)) { 8270 /* 8271 * ISSUE with ECN, see FWD-TSN processing for notes 8272 * on issues that will occur when the ECN NONCE 8273 * stuff is put into SCTP for cross checking. 8274 */ 8275 if (compare_with_wrap(asoc->advanced_peer_ack_point, old_adv_peer_ack_point, 8276 MAX_TSN)) { 8277 send_forward_tsn(stcb, asoc); 8278 /* 8279 * ECN Nonce: Disable Nonce Sum check when 8280 * FWD TSN is sent and store resync tsn 8281 */ 8282 asoc->nonce_sum_check = 0; 8283 asoc->nonce_resync_tsn = asoc->advanced_peer_ack_point; 8284 } else if (lchk) { 8285 /* try to FR fwd-tsn's that get lost too */ 8286 lchk->rec.data.fwd_tsn_cnt++; 8287 if (lchk->rec.data.fwd_tsn_cnt > 3) { 8288 send_forward_tsn(stcb, asoc); 8289 lchk->rec.data.fwd_tsn_cnt = 0; 8290 } 8291 } 8292 } 8293 if (lchk) { 8294 /* Assure a timer is up */ 8295 sctp_timer_start(SCTP_TIMER_TYPE_SEND, 8296 stcb->sctp_ep, stcb, lchk->whoTo); 8297 } 8298 } 8299 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_RWND_LOGGING_ENABLE) { 8300 sctp_misc_ints(SCTP_SACK_RWND_UPDATE, 8301 a_rwnd, 8302 stcb->asoc.peers_rwnd, 8303 stcb->asoc.total_flight, 8304 stcb->asoc.total_output_queue_size); 8305 } 8306 } 8307