sctp_indata.c revision 237542
1/*- 2 * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved. 3 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved. 4 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are met: 8 * 9 * a) Redistributions of source code must retain the above copyright notice, 10 * this list of conditions and the following disclaimer. 11 * 12 * b) Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in 14 * the documentation and/or other materials provided with the distribution. 15 * 16 * c) Neither the name of Cisco Systems, Inc. nor the names of its 17 * contributors may be used to endorse or promote products derived 18 * from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 22 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 30 * THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33#include <sys/cdefs.h> 34__FBSDID("$FreeBSD: head/sys/netinet/sctp_indata.c 237542 2012-06-24 23:12:24Z tuexen $"); 35 36#include <netinet/sctp_os.h> 37#include <netinet/sctp_var.h> 38#include <netinet/sctp_sysctl.h> 39#include <netinet/sctp_pcb.h> 40#include <netinet/sctp_header.h> 41#include <netinet/sctputil.h> 42#include <netinet/sctp_output.h> 43#include <netinet/sctp_input.h> 44#include <netinet/sctp_indata.h> 45#include <netinet/sctp_uio.h> 46#include <netinet/sctp_timer.h> 47 48 49/* 50 * NOTES: On the outbound side of things I need to check the sack timer to 51 * see if I should generate a sack into the chunk queue (if I have data to 52 * send that is and will be sending it .. for bundling. 53 * 54 * The callback in sctp_usrreq.c will get called when the socket is read from. 55 * This will cause sctp_service_queues() to get called on the top entry in 56 * the list. 57 */ 58 59void 60sctp_set_rwnd(struct sctp_tcb *stcb, struct sctp_association *asoc) 61{ 62 asoc->my_rwnd = sctp_calc_rwnd(stcb, asoc); 63} 64 65/* Calculate what the rwnd would be */ 66uint32_t 67sctp_calc_rwnd(struct sctp_tcb *stcb, struct sctp_association *asoc) 68{ 69 uint32_t calc = 0; 70 71 /* 72 * This is really set wrong with respect to a 1-2-m socket. Since 73 * the sb_cc is the count that everyone as put up. When we re-write 74 * sctp_soreceive then we will fix this so that ONLY this 75 * associations data is taken into account. 76 */ 77 if (stcb->sctp_socket == NULL) 78 return (calc); 79 80 if (stcb->asoc.sb_cc == 0 && 81 asoc->size_on_reasm_queue == 0 && 82 asoc->size_on_all_streams == 0) { 83 /* Full rwnd granted */ 84 calc = max(SCTP_SB_LIMIT_RCV(stcb->sctp_socket), SCTP_MINIMAL_RWND); 85 return (calc); 86 } 87 /* get actual space */ 88 calc = (uint32_t) sctp_sbspace(&stcb->asoc, &stcb->sctp_socket->so_rcv); 89 90 /* 91 * take out what has NOT been put on socket queue and we yet hold 92 * for putting up. 93 */ 94 calc = sctp_sbspace_sub(calc, (uint32_t) (asoc->size_on_reasm_queue + 95 asoc->cnt_on_reasm_queue * MSIZE)); 96 calc = sctp_sbspace_sub(calc, (uint32_t) (asoc->size_on_all_streams + 97 asoc->cnt_on_all_streams * MSIZE)); 98 99 if (calc == 0) { 100 /* out of space */ 101 return (calc); 102 } 103 /* what is the overhead of all these rwnd's */ 104 calc = sctp_sbspace_sub(calc, stcb->asoc.my_rwnd_control_len); 105 /* 106 * If the window gets too small due to ctrl-stuff, reduce it to 1, 107 * even it is 0. SWS engaged 108 */ 109 if (calc < stcb->asoc.my_rwnd_control_len) { 110 calc = 1; 111 } 112 return (calc); 113} 114 115 116 117/* 118 * Build out our readq entry based on the incoming packet. 119 */ 120struct sctp_queued_to_read * 121sctp_build_readq_entry(struct sctp_tcb *stcb, 122 struct sctp_nets *net, 123 uint32_t tsn, uint32_t ppid, 124 uint32_t context, uint16_t stream_no, 125 uint16_t stream_seq, uint8_t flags, 126 struct mbuf *dm) 127{ 128 struct sctp_queued_to_read *read_queue_e = NULL; 129 130 sctp_alloc_a_readq(stcb, read_queue_e); 131 if (read_queue_e == NULL) { 132 goto failed_build; 133 } 134 read_queue_e->sinfo_stream = stream_no; 135 read_queue_e->sinfo_ssn = stream_seq; 136 read_queue_e->sinfo_flags = (flags << 8); 137 read_queue_e->sinfo_ppid = ppid; 138 read_queue_e->sinfo_context = context; 139 read_queue_e->sinfo_timetolive = 0; 140 read_queue_e->sinfo_tsn = tsn; 141 read_queue_e->sinfo_cumtsn = tsn; 142 read_queue_e->sinfo_assoc_id = sctp_get_associd(stcb); 143 read_queue_e->whoFrom = net; 144 read_queue_e->length = 0; 145 atomic_add_int(&net->ref_count, 1); 146 read_queue_e->data = dm; 147 read_queue_e->spec_flags = 0; 148 read_queue_e->tail_mbuf = NULL; 149 read_queue_e->aux_data = NULL; 150 read_queue_e->stcb = stcb; 151 read_queue_e->port_from = stcb->rport; 152 read_queue_e->do_not_ref_stcb = 0; 153 read_queue_e->end_added = 0; 154 read_queue_e->some_taken = 0; 155 read_queue_e->pdapi_aborted = 0; 156failed_build: 157 return (read_queue_e); 158} 159 160 161/* 162 * Build out our readq entry based on the incoming packet. 163 */ 164static struct sctp_queued_to_read * 165sctp_build_readq_entry_chk(struct sctp_tcb *stcb, 166 struct sctp_tmit_chunk *chk) 167{ 168 struct sctp_queued_to_read *read_queue_e = NULL; 169 170 sctp_alloc_a_readq(stcb, read_queue_e); 171 if (read_queue_e == NULL) { 172 goto failed_build; 173 } 174 read_queue_e->sinfo_stream = chk->rec.data.stream_number; 175 read_queue_e->sinfo_ssn = chk->rec.data.stream_seq; 176 read_queue_e->sinfo_flags = (chk->rec.data.rcv_flags << 8); 177 read_queue_e->sinfo_ppid = chk->rec.data.payloadtype; 178 read_queue_e->sinfo_context = stcb->asoc.context; 179 read_queue_e->sinfo_timetolive = 0; 180 read_queue_e->sinfo_tsn = chk->rec.data.TSN_seq; 181 read_queue_e->sinfo_cumtsn = chk->rec.data.TSN_seq; 182 read_queue_e->sinfo_assoc_id = sctp_get_associd(stcb); 183 read_queue_e->whoFrom = chk->whoTo; 184 read_queue_e->aux_data = NULL; 185 read_queue_e->length = 0; 186 atomic_add_int(&chk->whoTo->ref_count, 1); 187 read_queue_e->data = chk->data; 188 read_queue_e->tail_mbuf = NULL; 189 read_queue_e->stcb = stcb; 190 read_queue_e->port_from = stcb->rport; 191 read_queue_e->spec_flags = 0; 192 read_queue_e->do_not_ref_stcb = 0; 193 read_queue_e->end_added = 0; 194 read_queue_e->some_taken = 0; 195 read_queue_e->pdapi_aborted = 0; 196failed_build: 197 return (read_queue_e); 198} 199 200 201struct mbuf * 202sctp_build_ctl_nchunk(struct sctp_inpcb *inp, struct sctp_sndrcvinfo *sinfo) 203{ 204 struct sctp_extrcvinfo *seinfo; 205 struct sctp_sndrcvinfo *outinfo; 206 struct sctp_rcvinfo *rcvinfo; 207 struct sctp_nxtinfo *nxtinfo; 208 struct cmsghdr *cmh; 209 struct mbuf *ret; 210 int len; 211 int use_extended; 212 int provide_nxt; 213 214 if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_RECVDATAIOEVNT) && 215 sctp_is_feature_off(inp, SCTP_PCB_FLAGS_RECVRCVINFO) && 216 sctp_is_feature_off(inp, SCTP_PCB_FLAGS_RECVNXTINFO)) { 217 /* user does not want any ancillary data */ 218 return (NULL); 219 } 220 len = 0; 221 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVRCVINFO)) { 222 len += CMSG_SPACE(sizeof(struct sctp_rcvinfo)); 223 } 224 seinfo = (struct sctp_extrcvinfo *)sinfo; 225 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVNXTINFO) && 226 (seinfo->sreinfo_next_flags & SCTP_NEXT_MSG_AVAIL)) { 227 provide_nxt = 1; 228 len += CMSG_SPACE(sizeof(struct sctp_rcvinfo)); 229 } else { 230 provide_nxt = 0; 231 } 232 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVDATAIOEVNT)) { 233 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXT_RCVINFO)) { 234 use_extended = 1; 235 len += CMSG_SPACE(sizeof(struct sctp_extrcvinfo)); 236 } else { 237 use_extended = 0; 238 len += CMSG_SPACE(sizeof(struct sctp_sndrcvinfo)); 239 } 240 } else { 241 use_extended = 0; 242 } 243 244 ret = sctp_get_mbuf_for_msg(len, 0, M_DONTWAIT, 1, MT_DATA); 245 if (ret == NULL) { 246 /* No space */ 247 return (ret); 248 } 249 SCTP_BUF_LEN(ret) = 0; 250 251 /* We need a CMSG header followed by the struct */ 252 cmh = mtod(ret, struct cmsghdr *); 253 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVRCVINFO)) { 254 cmh->cmsg_level = IPPROTO_SCTP; 255 cmh->cmsg_len = CMSG_LEN(sizeof(struct sctp_rcvinfo)); 256 cmh->cmsg_type = SCTP_RCVINFO; 257 rcvinfo = (struct sctp_rcvinfo *)CMSG_DATA(cmh); 258 rcvinfo->rcv_sid = sinfo->sinfo_stream; 259 rcvinfo->rcv_ssn = sinfo->sinfo_ssn; 260 rcvinfo->rcv_flags = sinfo->sinfo_flags; 261 rcvinfo->rcv_ppid = sinfo->sinfo_ppid; 262 rcvinfo->rcv_tsn = sinfo->sinfo_tsn; 263 rcvinfo->rcv_cumtsn = sinfo->sinfo_cumtsn; 264 rcvinfo->rcv_context = sinfo->sinfo_context; 265 rcvinfo->rcv_assoc_id = sinfo->sinfo_assoc_id; 266 cmh = (struct cmsghdr *)((caddr_t)cmh + CMSG_SPACE(sizeof(struct sctp_rcvinfo))); 267 SCTP_BUF_LEN(ret) += CMSG_SPACE(sizeof(struct sctp_rcvinfo)); 268 } 269 if (provide_nxt) { 270 cmh->cmsg_level = IPPROTO_SCTP; 271 cmh->cmsg_len = CMSG_LEN(sizeof(struct sctp_nxtinfo)); 272 cmh->cmsg_type = SCTP_NXTINFO; 273 nxtinfo = (struct sctp_nxtinfo *)CMSG_DATA(cmh); 274 nxtinfo->nxt_sid = seinfo->sreinfo_next_stream; 275 nxtinfo->nxt_flags = 0; 276 if (seinfo->sreinfo_next_flags & SCTP_NEXT_MSG_IS_UNORDERED) { 277 nxtinfo->nxt_flags |= SCTP_UNORDERED; 278 } 279 if (seinfo->sreinfo_next_flags & SCTP_NEXT_MSG_IS_NOTIFICATION) { 280 nxtinfo->nxt_flags |= SCTP_NOTIFICATION; 281 } 282 if (seinfo->sreinfo_next_flags & SCTP_NEXT_MSG_ISCOMPLETE) { 283 nxtinfo->nxt_flags |= SCTP_COMPLETE; 284 } 285 nxtinfo->nxt_ppid = seinfo->sreinfo_next_ppid; 286 nxtinfo->nxt_length = seinfo->sreinfo_next_length; 287 nxtinfo->nxt_assoc_id = seinfo->sreinfo_next_aid; 288 cmh = (struct cmsghdr *)((caddr_t)cmh + CMSG_SPACE(sizeof(struct sctp_nxtinfo))); 289 SCTP_BUF_LEN(ret) += CMSG_SPACE(sizeof(struct sctp_nxtinfo)); 290 } 291 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVDATAIOEVNT)) { 292 cmh->cmsg_level = IPPROTO_SCTP; 293 outinfo = (struct sctp_sndrcvinfo *)CMSG_DATA(cmh); 294 if (use_extended) { 295 cmh->cmsg_len = CMSG_LEN(sizeof(struct sctp_extrcvinfo)); 296 cmh->cmsg_type = SCTP_EXTRCV; 297 memcpy(outinfo, sinfo, sizeof(struct sctp_extrcvinfo)); 298 SCTP_BUF_LEN(ret) += CMSG_SPACE(sizeof(struct sctp_extrcvinfo)); 299 } else { 300 cmh->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo)); 301 cmh->cmsg_type = SCTP_SNDRCV; 302 *outinfo = *sinfo; 303 SCTP_BUF_LEN(ret) += CMSG_SPACE(sizeof(struct sctp_sndrcvinfo)); 304 } 305 } 306 return (ret); 307} 308 309 310static void 311sctp_mark_non_revokable(struct sctp_association *asoc, uint32_t tsn) 312{ 313 uint32_t gap, i, cumackp1; 314 int fnd = 0; 315 316 if (SCTP_BASE_SYSCTL(sctp_do_drain) == 0) { 317 return; 318 } 319 cumackp1 = asoc->cumulative_tsn + 1; 320 if (SCTP_TSN_GT(cumackp1, tsn)) { 321 /* 322 * this tsn is behind the cum ack and thus we don't need to 323 * worry about it being moved from one to the other. 324 */ 325 return; 326 } 327 SCTP_CALC_TSN_TO_GAP(gap, tsn, asoc->mapping_array_base_tsn); 328 if (!SCTP_IS_TSN_PRESENT(asoc->mapping_array, gap)) { 329 SCTP_PRINTF("gap:%x tsn:%x\n", gap, tsn); 330 sctp_print_mapping_array(asoc); 331#ifdef INVARIANTS 332 panic("Things are really messed up now!!"); 333#endif 334 } 335 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap); 336 SCTP_UNSET_TSN_PRESENT(asoc->mapping_array, gap); 337 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) { 338 asoc->highest_tsn_inside_nr_map = tsn; 339 } 340 if (tsn == asoc->highest_tsn_inside_map) { 341 /* We must back down to see what the new highest is */ 342 for (i = tsn - 1; SCTP_TSN_GE(i, asoc->mapping_array_base_tsn); i--) { 343 SCTP_CALC_TSN_TO_GAP(gap, i, asoc->mapping_array_base_tsn); 344 if (SCTP_IS_TSN_PRESENT(asoc->mapping_array, gap)) { 345 asoc->highest_tsn_inside_map = i; 346 fnd = 1; 347 break; 348 } 349 } 350 if (!fnd) { 351 asoc->highest_tsn_inside_map = asoc->mapping_array_base_tsn - 1; 352 } 353 } 354} 355 356 357/* 358 * We are delivering currently from the reassembly queue. We must continue to 359 * deliver until we either: 1) run out of space. 2) run out of sequential 360 * TSN's 3) hit the SCTP_DATA_LAST_FRAG flag. 361 */ 362static void 363sctp_service_reassembly(struct sctp_tcb *stcb, struct sctp_association *asoc) 364{ 365 struct sctp_tmit_chunk *chk, *nchk; 366 uint16_t nxt_todel; 367 uint16_t stream_no; 368 int end = 0; 369 int cntDel; 370 struct sctp_queued_to_read *control, *ctl, *nctl; 371 372 if (stcb == NULL) 373 return; 374 375 cntDel = stream_no = 0; 376 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 377 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) || 378 (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET)) { 379 /* socket above is long gone or going.. */ 380abandon: 381 asoc->fragmented_delivery_inprogress = 0; 382 TAILQ_FOREACH_SAFE(chk, &asoc->reasmqueue, sctp_next, nchk) { 383 TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next); 384 asoc->size_on_reasm_queue -= chk->send_size; 385 sctp_ucount_decr(asoc->cnt_on_reasm_queue); 386 /* 387 * Lose the data pointer, since its in the socket 388 * buffer 389 */ 390 if (chk->data) { 391 sctp_m_freem(chk->data); 392 chk->data = NULL; 393 } 394 /* Now free the address and data */ 395 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 396 /* sa_ignore FREED_MEMORY */ 397 } 398 return; 399 } 400 SCTP_TCB_LOCK_ASSERT(stcb); 401 TAILQ_FOREACH_SAFE(chk, &asoc->reasmqueue, sctp_next, nchk) { 402 if (chk->rec.data.TSN_seq != (asoc->tsn_last_delivered + 1)) { 403 /* Can't deliver more :< */ 404 return; 405 } 406 stream_no = chk->rec.data.stream_number; 407 nxt_todel = asoc->strmin[stream_no].last_sequence_delivered + 1; 408 if (nxt_todel != chk->rec.data.stream_seq && 409 (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) { 410 /* 411 * Not the next sequence to deliver in its stream OR 412 * unordered 413 */ 414 return; 415 } 416 if (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) { 417 418 control = sctp_build_readq_entry_chk(stcb, chk); 419 if (control == NULL) { 420 /* out of memory? */ 421 return; 422 } 423 /* save it off for our future deliveries */ 424 stcb->asoc.control_pdapi = control; 425 if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) 426 end = 1; 427 else 428 end = 0; 429 sctp_mark_non_revokable(asoc, chk->rec.data.TSN_seq); 430 sctp_add_to_readq(stcb->sctp_ep, 431 stcb, control, &stcb->sctp_socket->so_rcv, end, 432 SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED); 433 cntDel++; 434 } else { 435 if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) 436 end = 1; 437 else 438 end = 0; 439 sctp_mark_non_revokable(asoc, chk->rec.data.TSN_seq); 440 if (sctp_append_to_readq(stcb->sctp_ep, stcb, 441 stcb->asoc.control_pdapi, 442 chk->data, end, chk->rec.data.TSN_seq, 443 &stcb->sctp_socket->so_rcv)) { 444 /* 445 * something is very wrong, either 446 * control_pdapi is NULL, or the tail_mbuf 447 * is corrupt, or there is a EOM already on 448 * the mbuf chain. 449 */ 450 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) { 451 goto abandon; 452 } else { 453#ifdef INVARIANTS 454 if ((stcb->asoc.control_pdapi == NULL) || (stcb->asoc.control_pdapi->tail_mbuf == NULL)) { 455 panic("This should not happen control_pdapi NULL?"); 456 } 457 /* if we did not panic, it was a EOM */ 458 panic("Bad chunking ??"); 459#else 460 if ((stcb->asoc.control_pdapi == NULL) || (stcb->asoc.control_pdapi->tail_mbuf == NULL)) { 461 SCTP_PRINTF("This should not happen control_pdapi NULL?\n"); 462 } 463 SCTP_PRINTF("Bad chunking ??\n"); 464 SCTP_PRINTF("Dumping re-assembly queue this will probably hose the association\n"); 465 466#endif 467 goto abandon; 468 } 469 } 470 cntDel++; 471 } 472 /* pull it we did it */ 473 TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next); 474 if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) { 475 asoc->fragmented_delivery_inprogress = 0; 476 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) { 477 asoc->strmin[stream_no].last_sequence_delivered++; 478 } 479 if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0) { 480 SCTP_STAT_INCR_COUNTER64(sctps_reasmusrmsgs); 481 } 482 } else if (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) { 483 /* 484 * turn the flag back on since we just delivered 485 * yet another one. 486 */ 487 asoc->fragmented_delivery_inprogress = 1; 488 } 489 asoc->tsn_of_pdapi_last_delivered = chk->rec.data.TSN_seq; 490 asoc->last_flags_delivered = chk->rec.data.rcv_flags; 491 asoc->last_strm_seq_delivered = chk->rec.data.stream_seq; 492 asoc->last_strm_no_delivered = chk->rec.data.stream_number; 493 494 asoc->tsn_last_delivered = chk->rec.data.TSN_seq; 495 asoc->size_on_reasm_queue -= chk->send_size; 496 sctp_ucount_decr(asoc->cnt_on_reasm_queue); 497 /* free up the chk */ 498 chk->data = NULL; 499 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 500 501 if (asoc->fragmented_delivery_inprogress == 0) { 502 /* 503 * Now lets see if we can deliver the next one on 504 * the stream 505 */ 506 struct sctp_stream_in *strm; 507 508 strm = &asoc->strmin[stream_no]; 509 nxt_todel = strm->last_sequence_delivered + 1; 510 TAILQ_FOREACH_SAFE(ctl, &strm->inqueue, next, nctl) { 511 /* Deliver more if we can. */ 512 if (nxt_todel == ctl->sinfo_ssn) { 513 TAILQ_REMOVE(&strm->inqueue, ctl, next); 514 asoc->size_on_all_streams -= ctl->length; 515 sctp_ucount_decr(asoc->cnt_on_all_streams); 516 strm->last_sequence_delivered++; 517 sctp_mark_non_revokable(asoc, 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 } else { 523 break; 524 } 525 nxt_todel = strm->last_sequence_delivered + 1; 526 } 527 break; 528 } 529 } 530} 531 532/* 533 * Queue the chunk either right into the socket buffer if it is the next one 534 * to go OR put it in the correct place in the delivery queue. If we do 535 * append to the so_buf, keep doing so until we are out of order. One big 536 * question still remains, what to do when the socket buffer is FULL?? 537 */ 538static void 539sctp_queue_data_to_stream(struct sctp_tcb *stcb, struct sctp_association *asoc, 540 struct sctp_queued_to_read *control, int *abort_flag) 541{ 542 /* 543 * FIX-ME maybe? What happens when the ssn wraps? If we are getting 544 * all the data in one stream this could happen quite rapidly. One 545 * could use the TSN to keep track of things, but this scheme breaks 546 * down in the other type of stream useage that could occur. Send a 547 * single msg to stream 0, send 4Billion messages to stream 1, now 548 * send a message to stream 0. You have a situation where the TSN 549 * has wrapped but not in the stream. Is this worth worrying about 550 * or should we just change our queue sort at the bottom to be by 551 * TSN. 552 * 553 * Could it also be legal for a peer to send ssn 1 with TSN 2 and ssn 2 554 * with TSN 1? If the peer is doing some sort of funky TSN/SSN 555 * assignment this could happen... and I don't see how this would be 556 * a violation. So for now I am undecided an will leave the sort by 557 * SSN alone. Maybe a hybred approach is the answer 558 * 559 */ 560 struct sctp_stream_in *strm; 561 struct sctp_queued_to_read *at; 562 int queue_needed; 563 uint16_t nxt_todel; 564 struct mbuf *oper; 565 566 queue_needed = 1; 567 asoc->size_on_all_streams += control->length; 568 sctp_ucount_incr(asoc->cnt_on_all_streams); 569 strm = &asoc->strmin[control->sinfo_stream]; 570 nxt_todel = strm->last_sequence_delivered + 1; 571 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { 572 sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_INTO_STRD); 573 } 574 SCTPDBG(SCTP_DEBUG_INDATA1, 575 "queue to stream called for ssn:%u lastdel:%u nxt:%u\n", 576 (uint32_t) control->sinfo_stream, 577 (uint32_t) strm->last_sequence_delivered, 578 (uint32_t) nxt_todel); 579 if (SCTP_SSN_GE(strm->last_sequence_delivered, control->sinfo_ssn)) { 580 /* The incoming sseq is behind where we last delivered? */ 581 SCTPDBG(SCTP_DEBUG_INDATA1, "Duplicate S-SEQ:%d delivered:%d from peer, Abort association\n", 582 control->sinfo_ssn, strm->last_sequence_delivered); 583protocol_error: 584 /* 585 * throw it in the stream so it gets cleaned up in 586 * association destruction 587 */ 588 TAILQ_INSERT_HEAD(&strm->inqueue, control, next); 589 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 590 0, M_DONTWAIT, 1, MT_DATA); 591 if (oper) { 592 struct sctp_paramhdr *ph; 593 uint32_t *ippp; 594 595 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + 596 (sizeof(uint32_t) * 3); 597 ph = mtod(oper, struct sctp_paramhdr *); 598 ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 599 ph->param_length = htons(SCTP_BUF_LEN(oper)); 600 ippp = (uint32_t *) (ph + 1); 601 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_1); 602 ippp++; 603 *ippp = control->sinfo_tsn; 604 ippp++; 605 *ippp = ((control->sinfo_stream << 16) | control->sinfo_ssn); 606 } 607 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_1; 608 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED); 609 *abort_flag = 1; 610 return; 611 612 } 613 if (nxt_todel == control->sinfo_ssn) { 614 /* can be delivered right away? */ 615 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { 616 sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_IMMED_DEL); 617 } 618 /* EY it wont be queued if it could be delivered directly */ 619 queue_needed = 0; 620 asoc->size_on_all_streams -= control->length; 621 sctp_ucount_decr(asoc->cnt_on_all_streams); 622 strm->last_sequence_delivered++; 623 624 sctp_mark_non_revokable(asoc, control->sinfo_tsn); 625 sctp_add_to_readq(stcb->sctp_ep, stcb, 626 control, 627 &stcb->sctp_socket->so_rcv, 1, 628 SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED); 629 TAILQ_FOREACH_SAFE(control, &strm->inqueue, next, at) { 630 /* all delivered */ 631 nxt_todel = strm->last_sequence_delivered + 1; 632 if (nxt_todel == control->sinfo_ssn) { 633 TAILQ_REMOVE(&strm->inqueue, control, next); 634 asoc->size_on_all_streams -= control->length; 635 sctp_ucount_decr(asoc->cnt_on_all_streams); 636 strm->last_sequence_delivered++; 637 /* 638 * We ignore the return of deliver_data here 639 * since we always can hold the chunk on the 640 * d-queue. And we have a finite number that 641 * can be delivered from the strq. 642 */ 643 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { 644 sctp_log_strm_del(control, NULL, 645 SCTP_STR_LOG_FROM_IMMED_DEL); 646 } 647 sctp_mark_non_revokable(asoc, control->sinfo_tsn); 648 sctp_add_to_readq(stcb->sctp_ep, stcb, 649 control, 650 &stcb->sctp_socket->so_rcv, 1, 651 SCTP_READ_LOCK_NOT_HELD, 652 SCTP_SO_NOT_LOCKED); 653 continue; 654 } 655 break; 656 } 657 } 658 if (queue_needed) { 659 /* 660 * Ok, we did not deliver this guy, find the correct place 661 * to put it on the queue. 662 */ 663 if (SCTP_TSN_GE(asoc->cumulative_tsn, control->sinfo_tsn)) { 664 goto protocol_error; 665 } 666 if (TAILQ_EMPTY(&strm->inqueue)) { 667 /* Empty queue */ 668 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { 669 sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_INSERT_HD); 670 } 671 TAILQ_INSERT_HEAD(&strm->inqueue, control, next); 672 } else { 673 TAILQ_FOREACH(at, &strm->inqueue, next) { 674 if (SCTP_SSN_GT(at->sinfo_ssn, control->sinfo_ssn)) { 675 /* 676 * one in queue is bigger than the 677 * new one, insert before this one 678 */ 679 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { 680 sctp_log_strm_del(control, at, 681 SCTP_STR_LOG_FROM_INSERT_MD); 682 } 683 TAILQ_INSERT_BEFORE(at, control, next); 684 break; 685 } else if (at->sinfo_ssn == control->sinfo_ssn) { 686 /* 687 * Gak, He sent me a duplicate str 688 * seq number 689 */ 690 /* 691 * foo bar, I guess I will just free 692 * this new guy, should we abort 693 * too? FIX ME MAYBE? Or it COULD be 694 * that the SSN's have wrapped. 695 * Maybe I should compare to TSN 696 * somehow... sigh for now just blow 697 * away the chunk! 698 */ 699 700 if (control->data) 701 sctp_m_freem(control->data); 702 control->data = NULL; 703 asoc->size_on_all_streams -= control->length; 704 sctp_ucount_decr(asoc->cnt_on_all_streams); 705 if (control->whoFrom) { 706 sctp_free_remote_addr(control->whoFrom); 707 control->whoFrom = NULL; 708 } 709 sctp_free_a_readq(stcb, control); 710 return; 711 } else { 712 if (TAILQ_NEXT(at, next) == NULL) { 713 /* 714 * We are at the end, insert 715 * it after this one 716 */ 717 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { 718 sctp_log_strm_del(control, at, 719 SCTP_STR_LOG_FROM_INSERT_TL); 720 } 721 TAILQ_INSERT_AFTER(&strm->inqueue, 722 at, control, next); 723 break; 724 } 725 } 726 } 727 } 728 } 729} 730 731/* 732 * Returns two things: You get the total size of the deliverable parts of the 733 * first fragmented message on the reassembly queue. And you get a 1 back if 734 * all of the message is ready or a 0 back if the message is still incomplete 735 */ 736static int 737sctp_is_all_msg_on_reasm(struct sctp_association *asoc, uint32_t * t_size) 738{ 739 struct sctp_tmit_chunk *chk; 740 uint32_t tsn; 741 742 *t_size = 0; 743 chk = TAILQ_FIRST(&asoc->reasmqueue); 744 if (chk == NULL) { 745 /* nothing on the queue */ 746 return (0); 747 } 748 if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0) { 749 /* Not a first on the queue */ 750 return (0); 751 } 752 tsn = chk->rec.data.TSN_seq; 753 TAILQ_FOREACH(chk, &asoc->reasmqueue, sctp_next) { 754 if (tsn != chk->rec.data.TSN_seq) { 755 return (0); 756 } 757 *t_size += chk->send_size; 758 if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) { 759 return (1); 760 } 761 tsn++; 762 } 763 return (0); 764} 765 766static void 767sctp_deliver_reasm_check(struct sctp_tcb *stcb, struct sctp_association *asoc) 768{ 769 struct sctp_tmit_chunk *chk; 770 uint16_t nxt_todel; 771 uint32_t tsize, pd_point; 772 773doit_again: 774 chk = TAILQ_FIRST(&asoc->reasmqueue); 775 if (chk == NULL) { 776 /* Huh? */ 777 asoc->size_on_reasm_queue = 0; 778 asoc->cnt_on_reasm_queue = 0; 779 return; 780 } 781 if (asoc->fragmented_delivery_inprogress == 0) { 782 nxt_todel = 783 asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered + 1; 784 if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) && 785 (nxt_todel == chk->rec.data.stream_seq || 786 (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED))) { 787 /* 788 * Yep the first one is here and its ok to deliver 789 * but should we? 790 */ 791 if (stcb->sctp_socket) { 792 pd_point = min(SCTP_SB_LIMIT_RCV(stcb->sctp_socket), 793 stcb->sctp_ep->partial_delivery_point); 794 } else { 795 pd_point = stcb->sctp_ep->partial_delivery_point; 796 } 797 if (sctp_is_all_msg_on_reasm(asoc, &tsize) || (tsize >= pd_point)) { 798 799 /* 800 * Yes, we setup to start reception, by 801 * backing down the TSN just in case we 802 * can't deliver. If we 803 */ 804 asoc->fragmented_delivery_inprogress = 1; 805 asoc->tsn_last_delivered = 806 chk->rec.data.TSN_seq - 1; 807 asoc->str_of_pdapi = 808 chk->rec.data.stream_number; 809 asoc->ssn_of_pdapi = chk->rec.data.stream_seq; 810 asoc->pdapi_ppid = chk->rec.data.payloadtype; 811 asoc->fragment_flags = chk->rec.data.rcv_flags; 812 sctp_service_reassembly(stcb, asoc); 813 } 814 } 815 } else { 816 /* 817 * Service re-assembly will deliver stream data queued at 818 * the end of fragmented delivery.. but it wont know to go 819 * back and call itself again... we do that here with the 820 * got doit_again 821 */ 822 sctp_service_reassembly(stcb, asoc); 823 if (asoc->fragmented_delivery_inprogress == 0) { 824 /* 825 * finished our Fragmented delivery, could be more 826 * waiting? 827 */ 828 goto doit_again; 829 } 830 } 831} 832 833/* 834 * Dump onto the re-assembly queue, in its proper place. After dumping on the 835 * queue, see if anthing can be delivered. If so pull it off (or as much as 836 * we can. If we run out of space then we must dump what we can and set the 837 * appropriate flag to say we queued what we could. 838 */ 839static void 840sctp_queue_data_for_reasm(struct sctp_tcb *stcb, struct sctp_association *asoc, 841 struct sctp_tmit_chunk *chk, int *abort_flag) 842{ 843 struct mbuf *oper; 844 uint32_t cum_ackp1, prev_tsn, post_tsn; 845 struct sctp_tmit_chunk *at, *prev, *next; 846 847 prev = next = NULL; 848 cum_ackp1 = asoc->tsn_last_delivered + 1; 849 if (TAILQ_EMPTY(&asoc->reasmqueue)) { 850 /* This is the first one on the queue */ 851 TAILQ_INSERT_HEAD(&asoc->reasmqueue, chk, sctp_next); 852 /* 853 * we do not check for delivery of anything when only one 854 * fragment is here 855 */ 856 asoc->size_on_reasm_queue = chk->send_size; 857 sctp_ucount_incr(asoc->cnt_on_reasm_queue); 858 if (chk->rec.data.TSN_seq == cum_ackp1) { 859 if (asoc->fragmented_delivery_inprogress == 0 && 860 (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) != 861 SCTP_DATA_FIRST_FRAG) { 862 /* 863 * An empty queue, no delivery inprogress, 864 * we hit the next one and it does NOT have 865 * a FIRST fragment mark. 866 */ 867 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, its not first, no fragmented delivery in progress\n"); 868 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 869 0, M_DONTWAIT, 1, MT_DATA); 870 871 if (oper) { 872 struct sctp_paramhdr *ph; 873 uint32_t *ippp; 874 875 SCTP_BUF_LEN(oper) = 876 sizeof(struct sctp_paramhdr) + 877 (sizeof(uint32_t) * 3); 878 ph = mtod(oper, struct sctp_paramhdr *); 879 ph->param_type = 880 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 881 ph->param_length = htons(SCTP_BUF_LEN(oper)); 882 ippp = (uint32_t *) (ph + 1); 883 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_2); 884 ippp++; 885 *ippp = chk->rec.data.TSN_seq; 886 ippp++; 887 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); 888 889 } 890 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_2; 891 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED); 892 *abort_flag = 1; 893 } else if (asoc->fragmented_delivery_inprogress && 894 (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == SCTP_DATA_FIRST_FRAG) { 895 /* 896 * We are doing a partial delivery and the 897 * NEXT chunk MUST be either the LAST or 898 * MIDDLE fragment NOT a FIRST 899 */ 900 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it IS a first and fragmented delivery in progress\n"); 901 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 902 0, M_DONTWAIT, 1, MT_DATA); 903 if (oper) { 904 struct sctp_paramhdr *ph; 905 uint32_t *ippp; 906 907 SCTP_BUF_LEN(oper) = 908 sizeof(struct sctp_paramhdr) + 909 (3 * sizeof(uint32_t)); 910 ph = mtod(oper, struct sctp_paramhdr *); 911 ph->param_type = 912 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 913 ph->param_length = htons(SCTP_BUF_LEN(oper)); 914 ippp = (uint32_t *) (ph + 1); 915 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_3); 916 ippp++; 917 *ippp = chk->rec.data.TSN_seq; 918 ippp++; 919 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); 920 } 921 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_3; 922 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED); 923 *abort_flag = 1; 924 } else if (asoc->fragmented_delivery_inprogress) { 925 /* 926 * Here we are ok with a MIDDLE or LAST 927 * piece 928 */ 929 if (chk->rec.data.stream_number != 930 asoc->str_of_pdapi) { 931 /* Got to be the right STR No */ 932 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it IS not same stream number %d vs %d\n", 933 chk->rec.data.stream_number, 934 asoc->str_of_pdapi); 935 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 936 0, M_DONTWAIT, 1, MT_DATA); 937 if (oper) { 938 struct sctp_paramhdr *ph; 939 uint32_t *ippp; 940 941 SCTP_BUF_LEN(oper) = 942 sizeof(struct sctp_paramhdr) + 943 (sizeof(uint32_t) * 3); 944 ph = mtod(oper, 945 struct sctp_paramhdr *); 946 ph->param_type = 947 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 948 ph->param_length = 949 htons(SCTP_BUF_LEN(oper)); 950 ippp = (uint32_t *) (ph + 1); 951 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_4); 952 ippp++; 953 *ippp = chk->rec.data.TSN_seq; 954 ippp++; 955 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); 956 } 957 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_4; 958 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED); 959 *abort_flag = 1; 960 } else if ((asoc->fragment_flags & SCTP_DATA_UNORDERED) != 961 SCTP_DATA_UNORDERED && 962 chk->rec.data.stream_seq != asoc->ssn_of_pdapi) { 963 /* Got to be the right STR Seq */ 964 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it IS not same stream seq %d vs %d\n", 965 chk->rec.data.stream_seq, 966 asoc->ssn_of_pdapi); 967 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 968 0, M_DONTWAIT, 1, MT_DATA); 969 if (oper) { 970 struct sctp_paramhdr *ph; 971 uint32_t *ippp; 972 973 SCTP_BUF_LEN(oper) = 974 sizeof(struct sctp_paramhdr) + 975 (3 * sizeof(uint32_t)); 976 ph = mtod(oper, 977 struct sctp_paramhdr *); 978 ph->param_type = 979 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 980 ph->param_length = 981 htons(SCTP_BUF_LEN(oper)); 982 ippp = (uint32_t *) (ph + 1); 983 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_5); 984 ippp++; 985 *ippp = chk->rec.data.TSN_seq; 986 ippp++; 987 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); 988 989 } 990 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_5; 991 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED); 992 *abort_flag = 1; 993 } 994 } 995 } 996 return; 997 } 998 /* Find its place */ 999 TAILQ_FOREACH(at, &asoc->reasmqueue, sctp_next) { 1000 if (SCTP_TSN_GT(at->rec.data.TSN_seq, chk->rec.data.TSN_seq)) { 1001 /* 1002 * one in queue is bigger than the new one, insert 1003 * before this one 1004 */ 1005 /* A check */ 1006 asoc->size_on_reasm_queue += chk->send_size; 1007 sctp_ucount_incr(asoc->cnt_on_reasm_queue); 1008 next = at; 1009 TAILQ_INSERT_BEFORE(at, chk, sctp_next); 1010 break; 1011 } else if (at->rec.data.TSN_seq == chk->rec.data.TSN_seq) { 1012 /* Gak, He sent me a duplicate str seq number */ 1013 /* 1014 * foo bar, I guess I will just free this new guy, 1015 * should we abort too? FIX ME MAYBE? Or it COULD be 1016 * that the SSN's have wrapped. Maybe I should 1017 * compare to TSN somehow... sigh for now just blow 1018 * away the chunk! 1019 */ 1020 if (chk->data) { 1021 sctp_m_freem(chk->data); 1022 chk->data = NULL; 1023 } 1024 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 1025 return; 1026 } else { 1027 prev = at; 1028 if (TAILQ_NEXT(at, sctp_next) == NULL) { 1029 /* 1030 * We are at the end, insert it after this 1031 * one 1032 */ 1033 /* check it first */ 1034 asoc->size_on_reasm_queue += chk->send_size; 1035 sctp_ucount_incr(asoc->cnt_on_reasm_queue); 1036 TAILQ_INSERT_AFTER(&asoc->reasmqueue, at, chk, sctp_next); 1037 break; 1038 } 1039 } 1040 } 1041 /* Now the audits */ 1042 if (prev) { 1043 prev_tsn = chk->rec.data.TSN_seq - 1; 1044 if (prev_tsn == prev->rec.data.TSN_seq) { 1045 /* 1046 * Ok the one I am dropping onto the end is the 1047 * NEXT. A bit of valdiation here. 1048 */ 1049 if ((prev->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) == 1050 SCTP_DATA_FIRST_FRAG || 1051 (prev->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) == 1052 SCTP_DATA_MIDDLE_FRAG) { 1053 /* 1054 * Insert chk MUST be a MIDDLE or LAST 1055 * fragment 1056 */ 1057 if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) == 1058 SCTP_DATA_FIRST_FRAG) { 1059 SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - It can be a midlle or last but not a first\n"); 1060 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it's a FIRST!\n"); 1061 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 1062 0, M_DONTWAIT, 1, MT_DATA); 1063 if (oper) { 1064 struct sctp_paramhdr *ph; 1065 uint32_t *ippp; 1066 1067 SCTP_BUF_LEN(oper) = 1068 sizeof(struct sctp_paramhdr) + 1069 (3 * sizeof(uint32_t)); 1070 ph = mtod(oper, 1071 struct sctp_paramhdr *); 1072 ph->param_type = 1073 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 1074 ph->param_length = 1075 htons(SCTP_BUF_LEN(oper)); 1076 ippp = (uint32_t *) (ph + 1); 1077 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_6); 1078 ippp++; 1079 *ippp = chk->rec.data.TSN_seq; 1080 ippp++; 1081 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); 1082 1083 } 1084 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_6; 1085 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED); 1086 *abort_flag = 1; 1087 return; 1088 } 1089 if (chk->rec.data.stream_number != 1090 prev->rec.data.stream_number) { 1091 /* 1092 * Huh, need the correct STR here, 1093 * they must be the same. 1094 */ 1095 SCTP_PRINTF("Prev check - Gak, Evil plot, ssn:%d not the same as at:%d\n", 1096 chk->rec.data.stream_number, 1097 prev->rec.data.stream_number); 1098 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 1099 0, M_DONTWAIT, 1, MT_DATA); 1100 if (oper) { 1101 struct sctp_paramhdr *ph; 1102 uint32_t *ippp; 1103 1104 SCTP_BUF_LEN(oper) = 1105 sizeof(struct sctp_paramhdr) + 1106 (3 * sizeof(uint32_t)); 1107 ph = mtod(oper, 1108 struct sctp_paramhdr *); 1109 ph->param_type = 1110 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 1111 ph->param_length = 1112 htons(SCTP_BUF_LEN(oper)); 1113 ippp = (uint32_t *) (ph + 1); 1114 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_7); 1115 ippp++; 1116 *ippp = chk->rec.data.TSN_seq; 1117 ippp++; 1118 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); 1119 } 1120 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_7; 1121 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED); 1122 *abort_flag = 1; 1123 return; 1124 } 1125 if ((prev->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0 && 1126 chk->rec.data.stream_seq != 1127 prev->rec.data.stream_seq) { 1128 /* 1129 * Huh, need the correct STR here, 1130 * they must be the same. 1131 */ 1132 SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - Gak, Evil plot, sseq:%d not the same as at:%d\n", 1133 chk->rec.data.stream_seq, 1134 prev->rec.data.stream_seq); 1135 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 1136 0, M_DONTWAIT, 1, MT_DATA); 1137 if (oper) { 1138 struct sctp_paramhdr *ph; 1139 uint32_t *ippp; 1140 1141 SCTP_BUF_LEN(oper) = 1142 sizeof(struct sctp_paramhdr) + 1143 (3 * sizeof(uint32_t)); 1144 ph = mtod(oper, 1145 struct sctp_paramhdr *); 1146 ph->param_type = 1147 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 1148 ph->param_length = 1149 htons(SCTP_BUF_LEN(oper)); 1150 ippp = (uint32_t *) (ph + 1); 1151 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_8); 1152 ippp++; 1153 *ippp = chk->rec.data.TSN_seq; 1154 ippp++; 1155 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); 1156 } 1157 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_8; 1158 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED); 1159 *abort_flag = 1; 1160 return; 1161 } 1162 } else if ((prev->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) == 1163 SCTP_DATA_LAST_FRAG) { 1164 /* Insert chk MUST be a FIRST */ 1165 if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) != 1166 SCTP_DATA_FIRST_FRAG) { 1167 SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - Gak, evil plot, its not FIRST and it must be!\n"); 1168 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 1169 0, M_DONTWAIT, 1, MT_DATA); 1170 if (oper) { 1171 struct sctp_paramhdr *ph; 1172 uint32_t *ippp; 1173 1174 SCTP_BUF_LEN(oper) = 1175 sizeof(struct sctp_paramhdr) + 1176 (3 * sizeof(uint32_t)); 1177 ph = mtod(oper, 1178 struct sctp_paramhdr *); 1179 ph->param_type = 1180 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 1181 ph->param_length = 1182 htons(SCTP_BUF_LEN(oper)); 1183 ippp = (uint32_t *) (ph + 1); 1184 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_9); 1185 ippp++; 1186 *ippp = chk->rec.data.TSN_seq; 1187 ippp++; 1188 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); 1189 1190 } 1191 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_9; 1192 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED); 1193 *abort_flag = 1; 1194 return; 1195 } 1196 } 1197 } 1198 } 1199 if (next) { 1200 post_tsn = chk->rec.data.TSN_seq + 1; 1201 if (post_tsn == next->rec.data.TSN_seq) { 1202 /* 1203 * Ok the one I am inserting ahead of is my NEXT 1204 * one. A bit of valdiation here. 1205 */ 1206 if (next->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) { 1207 /* Insert chk MUST be a last fragment */ 1208 if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) 1209 != SCTP_DATA_LAST_FRAG) { 1210 SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Next is FIRST, we must be LAST\n"); 1211 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, its not a last!\n"); 1212 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 1213 0, M_DONTWAIT, 1, MT_DATA); 1214 if (oper) { 1215 struct sctp_paramhdr *ph; 1216 uint32_t *ippp; 1217 1218 SCTP_BUF_LEN(oper) = 1219 sizeof(struct sctp_paramhdr) + 1220 (3 * sizeof(uint32_t)); 1221 ph = mtod(oper, 1222 struct sctp_paramhdr *); 1223 ph->param_type = 1224 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 1225 ph->param_length = 1226 htons(SCTP_BUF_LEN(oper)); 1227 ippp = (uint32_t *) (ph + 1); 1228 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_10); 1229 ippp++; 1230 *ippp = chk->rec.data.TSN_seq; 1231 ippp++; 1232 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); 1233 } 1234 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_10; 1235 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED); 1236 *abort_flag = 1; 1237 return; 1238 } 1239 } else if ((next->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) == 1240 SCTP_DATA_MIDDLE_FRAG || 1241 (next->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) == 1242 SCTP_DATA_LAST_FRAG) { 1243 /* 1244 * Insert chk CAN be MIDDLE or FIRST NOT 1245 * LAST 1246 */ 1247 if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) == 1248 SCTP_DATA_LAST_FRAG) { 1249 SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Next is a MIDDLE/LAST\n"); 1250 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, new prev chunk is a LAST\n"); 1251 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 1252 0, M_DONTWAIT, 1, MT_DATA); 1253 if (oper) { 1254 struct sctp_paramhdr *ph; 1255 uint32_t *ippp; 1256 1257 SCTP_BUF_LEN(oper) = 1258 sizeof(struct sctp_paramhdr) + 1259 (3 * sizeof(uint32_t)); 1260 ph = mtod(oper, 1261 struct sctp_paramhdr *); 1262 ph->param_type = 1263 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 1264 ph->param_length = 1265 htons(SCTP_BUF_LEN(oper)); 1266 ippp = (uint32_t *) (ph + 1); 1267 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_11); 1268 ippp++; 1269 *ippp = chk->rec.data.TSN_seq; 1270 ippp++; 1271 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); 1272 1273 } 1274 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_11; 1275 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED); 1276 *abort_flag = 1; 1277 return; 1278 } 1279 if (chk->rec.data.stream_number != 1280 next->rec.data.stream_number) { 1281 /* 1282 * Huh, need the correct STR here, 1283 * they must be the same. 1284 */ 1285 SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Gak, Evil plot, ssn:%d not the same as at:%d\n", 1286 chk->rec.data.stream_number, 1287 next->rec.data.stream_number); 1288 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 1289 0, M_DONTWAIT, 1, MT_DATA); 1290 if (oper) { 1291 struct sctp_paramhdr *ph; 1292 uint32_t *ippp; 1293 1294 SCTP_BUF_LEN(oper) = 1295 sizeof(struct sctp_paramhdr) + 1296 (3 * sizeof(uint32_t)); 1297 ph = mtod(oper, 1298 struct sctp_paramhdr *); 1299 ph->param_type = 1300 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 1301 ph->param_length = 1302 htons(SCTP_BUF_LEN(oper)); 1303 ippp = (uint32_t *) (ph + 1); 1304 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_12); 1305 ippp++; 1306 *ippp = chk->rec.data.TSN_seq; 1307 ippp++; 1308 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); 1309 1310 } 1311 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_12; 1312 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED); 1313 *abort_flag = 1; 1314 return; 1315 } 1316 if ((next->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0 && 1317 chk->rec.data.stream_seq != 1318 next->rec.data.stream_seq) { 1319 /* 1320 * Huh, need the correct STR here, 1321 * they must be the same. 1322 */ 1323 SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Gak, Evil plot, sseq:%d not the same as at:%d\n", 1324 chk->rec.data.stream_seq, 1325 next->rec.data.stream_seq); 1326 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 1327 0, M_DONTWAIT, 1, MT_DATA); 1328 if (oper) { 1329 struct sctp_paramhdr *ph; 1330 uint32_t *ippp; 1331 1332 SCTP_BUF_LEN(oper) = 1333 sizeof(struct sctp_paramhdr) + 1334 (3 * sizeof(uint32_t)); 1335 ph = mtod(oper, 1336 struct sctp_paramhdr *); 1337 ph->param_type = 1338 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 1339 ph->param_length = 1340 htons(SCTP_BUF_LEN(oper)); 1341 ippp = (uint32_t *) (ph + 1); 1342 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_13); 1343 ippp++; 1344 *ippp = chk->rec.data.TSN_seq; 1345 ippp++; 1346 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); 1347 } 1348 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_13; 1349 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED); 1350 *abort_flag = 1; 1351 return; 1352 } 1353 } 1354 } 1355 } 1356 /* Do we need to do some delivery? check */ 1357 sctp_deliver_reasm_check(stcb, asoc); 1358} 1359 1360/* 1361 * This is an unfortunate routine. It checks to make sure a evil guy is not 1362 * stuffing us full of bad packet fragments. A broken peer could also do this 1363 * but this is doubtful. It is to bad I must worry about evil crackers sigh 1364 * :< more cycles. 1365 */ 1366static int 1367sctp_does_tsn_belong_to_reasm(struct sctp_association *asoc, 1368 uint32_t TSN_seq) 1369{ 1370 struct sctp_tmit_chunk *at; 1371 uint32_t tsn_est; 1372 1373 TAILQ_FOREACH(at, &asoc->reasmqueue, sctp_next) { 1374 if (SCTP_TSN_GT(TSN_seq, at->rec.data.TSN_seq)) { 1375 /* is it one bigger? */ 1376 tsn_est = at->rec.data.TSN_seq + 1; 1377 if (tsn_est == TSN_seq) { 1378 /* yep. It better be a last then */ 1379 if ((at->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) != 1380 SCTP_DATA_LAST_FRAG) { 1381 /* 1382 * Ok this guy belongs next to a guy 1383 * that is NOT last, it should be a 1384 * middle/last, not a complete 1385 * chunk. 1386 */ 1387 return (1); 1388 } else { 1389 /* 1390 * This guy is ok since its a LAST 1391 * and the new chunk is a fully 1392 * self- contained one. 1393 */ 1394 return (0); 1395 } 1396 } 1397 } else if (TSN_seq == at->rec.data.TSN_seq) { 1398 /* Software error since I have a dup? */ 1399 return (1); 1400 } else { 1401 /* 1402 * Ok, 'at' is larger than new chunk but does it 1403 * need to be right before it. 1404 */ 1405 tsn_est = TSN_seq + 1; 1406 if (tsn_est == at->rec.data.TSN_seq) { 1407 /* Yep, It better be a first */ 1408 if ((at->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) != 1409 SCTP_DATA_FIRST_FRAG) { 1410 return (1); 1411 } else { 1412 return (0); 1413 } 1414 } 1415 } 1416 } 1417 return (0); 1418} 1419 1420 1421static int 1422sctp_process_a_data_chunk(struct sctp_tcb *stcb, struct sctp_association *asoc, 1423 struct mbuf **m, int offset, struct sctp_data_chunk *ch, int chk_length, 1424 struct sctp_nets *net, uint32_t * high_tsn, int *abort_flag, 1425 int *break_flag, int last_chunk) 1426{ 1427 /* Process a data chunk */ 1428 /* struct sctp_tmit_chunk *chk; */ 1429 struct sctp_tmit_chunk *chk; 1430 uint32_t tsn, gap; 1431 struct mbuf *dmbuf; 1432 int the_len; 1433 int need_reasm_check = 0; 1434 uint16_t strmno, strmseq; 1435 struct mbuf *oper; 1436 struct sctp_queued_to_read *control; 1437 int ordered; 1438 uint32_t protocol_id; 1439 uint8_t chunk_flags; 1440 struct sctp_stream_reset_list *liste; 1441 1442 chk = NULL; 1443 tsn = ntohl(ch->dp.tsn); 1444 chunk_flags = ch->ch.chunk_flags; 1445 if ((chunk_flags & SCTP_DATA_SACK_IMMEDIATELY) == SCTP_DATA_SACK_IMMEDIATELY) { 1446 asoc->send_sack = 1; 1447 } 1448 protocol_id = ch->dp.protocol_id; 1449 ordered = ((chunk_flags & SCTP_DATA_UNORDERED) == 0); 1450 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 1451 sctp_log_map(tsn, asoc->cumulative_tsn, asoc->highest_tsn_inside_map, SCTP_MAP_TSN_ENTERS); 1452 } 1453 if (stcb == NULL) { 1454 return (0); 1455 } 1456 SCTP_LTRACE_CHK(stcb->sctp_ep, stcb, ch->ch.chunk_type, tsn); 1457 if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 1458 /* It is a duplicate */ 1459 SCTP_STAT_INCR(sctps_recvdupdata); 1460 if (asoc->numduptsns < SCTP_MAX_DUP_TSNS) { 1461 /* Record a dup for the next outbound sack */ 1462 asoc->dup_tsns[asoc->numduptsns] = tsn; 1463 asoc->numduptsns++; 1464 } 1465 asoc->send_sack = 1; 1466 return (0); 1467 } 1468 /* Calculate the number of TSN's between the base and this TSN */ 1469 SCTP_CALC_TSN_TO_GAP(gap, tsn, asoc->mapping_array_base_tsn); 1470 if (gap >= (SCTP_MAPPING_ARRAY << 3)) { 1471 /* Can't hold the bit in the mapping at max array, toss it */ 1472 return (0); 1473 } 1474 if (gap >= (uint32_t) (asoc->mapping_array_size << 3)) { 1475 SCTP_TCB_LOCK_ASSERT(stcb); 1476 if (sctp_expand_mapping_array(asoc, gap)) { 1477 /* Can't expand, drop it */ 1478 return (0); 1479 } 1480 } 1481 if (SCTP_TSN_GT(tsn, *high_tsn)) { 1482 *high_tsn = tsn; 1483 } 1484 /* See if we have received this one already */ 1485 if (SCTP_IS_TSN_PRESENT(asoc->mapping_array, gap) || 1486 SCTP_IS_TSN_PRESENT(asoc->nr_mapping_array, gap)) { 1487 SCTP_STAT_INCR(sctps_recvdupdata); 1488 if (asoc->numduptsns < SCTP_MAX_DUP_TSNS) { 1489 /* Record a dup for the next outbound sack */ 1490 asoc->dup_tsns[asoc->numduptsns] = tsn; 1491 asoc->numduptsns++; 1492 } 1493 asoc->send_sack = 1; 1494 return (0); 1495 } 1496 /* 1497 * Check to see about the GONE flag, duplicates would cause a sack 1498 * to be sent up above 1499 */ 1500 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 1501 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || 1502 (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET)) 1503 ) { 1504 /* 1505 * wait a minute, this guy is gone, there is no longer a 1506 * receiver. Send peer an ABORT! 1507 */ 1508 struct mbuf *op_err; 1509 1510 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 1511 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 1512 *abort_flag = 1; 1513 return (0); 1514 } 1515 /* 1516 * Now before going further we see if there is room. If NOT then we 1517 * MAY let one through only IF this TSN is the one we are waiting 1518 * for on a partial delivery API. 1519 */ 1520 1521 /* now do the tests */ 1522 if (((asoc->cnt_on_all_streams + 1523 asoc->cnt_on_reasm_queue + 1524 asoc->cnt_msg_on_sb) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue)) || 1525 (((int)asoc->my_rwnd) <= 0)) { 1526 /* 1527 * When we have NO room in the rwnd we check to make sure 1528 * the reader is doing its job... 1529 */ 1530 if (stcb->sctp_socket->so_rcv.sb_cc) { 1531 /* some to read, wake-up */ 1532#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1533 struct socket *so; 1534 1535 so = SCTP_INP_SO(stcb->sctp_ep); 1536 atomic_add_int(&stcb->asoc.refcnt, 1); 1537 SCTP_TCB_UNLOCK(stcb); 1538 SCTP_SOCKET_LOCK(so, 1); 1539 SCTP_TCB_LOCK(stcb); 1540 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1541 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1542 /* assoc was freed while we were unlocked */ 1543 SCTP_SOCKET_UNLOCK(so, 1); 1544 return (0); 1545 } 1546#endif 1547 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 1548#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1549 SCTP_SOCKET_UNLOCK(so, 1); 1550#endif 1551 } 1552 /* now is it in the mapping array of what we have accepted? */ 1553 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_map) && 1554 SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) { 1555 /* Nope not in the valid range dump it */ 1556 sctp_set_rwnd(stcb, asoc); 1557 if ((asoc->cnt_on_all_streams + 1558 asoc->cnt_on_reasm_queue + 1559 asoc->cnt_msg_on_sb) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue)) { 1560 SCTP_STAT_INCR(sctps_datadropchklmt); 1561 } else { 1562 SCTP_STAT_INCR(sctps_datadroprwnd); 1563 } 1564 *break_flag = 1; 1565 return (0); 1566 } 1567 } 1568 strmno = ntohs(ch->dp.stream_id); 1569 if (strmno >= asoc->streamincnt) { 1570 struct sctp_paramhdr *phdr; 1571 struct mbuf *mb; 1572 1573 mb = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) * 2), 1574 0, M_DONTWAIT, 1, MT_DATA); 1575 if (mb != NULL) { 1576 /* add some space up front so prepend will work well */ 1577 SCTP_BUF_RESV_UF(mb, sizeof(struct sctp_chunkhdr)); 1578 phdr = mtod(mb, struct sctp_paramhdr *); 1579 /* 1580 * Error causes are just param's and this one has 1581 * two back to back phdr, one with the error type 1582 * and size, the other with the streamid and a rsvd 1583 */ 1584 SCTP_BUF_LEN(mb) = (sizeof(struct sctp_paramhdr) * 2); 1585 phdr->param_type = htons(SCTP_CAUSE_INVALID_STREAM); 1586 phdr->param_length = 1587 htons(sizeof(struct sctp_paramhdr) * 2); 1588 phdr++; 1589 /* We insert the stream in the type field */ 1590 phdr->param_type = ch->dp.stream_id; 1591 /* And set the length to 0 for the rsvd field */ 1592 phdr->param_length = 0; 1593 sctp_queue_op_err(stcb, mb); 1594 } 1595 SCTP_STAT_INCR(sctps_badsid); 1596 SCTP_TCB_LOCK_ASSERT(stcb); 1597 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap); 1598 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) { 1599 asoc->highest_tsn_inside_nr_map = tsn; 1600 } 1601 if (tsn == (asoc->cumulative_tsn + 1)) { 1602 /* Update cum-ack */ 1603 asoc->cumulative_tsn = tsn; 1604 } 1605 return (0); 1606 } 1607 /* 1608 * Before we continue lets validate that we are not being fooled by 1609 * an evil attacker. We can only have 4k chunks based on our TSN 1610 * spread allowed by the mapping array 512 * 8 bits, so there is no 1611 * way our stream sequence numbers could have wrapped. We of course 1612 * only validate the FIRST fragment so the bit must be set. 1613 */ 1614 strmseq = ntohs(ch->dp.stream_sequence); 1615#ifdef SCTP_ASOCLOG_OF_TSNS 1616 SCTP_TCB_LOCK_ASSERT(stcb); 1617 if (asoc->tsn_in_at >= SCTP_TSN_LOG_SIZE) { 1618 asoc->tsn_in_at = 0; 1619 asoc->tsn_in_wrapped = 1; 1620 } 1621 asoc->in_tsnlog[asoc->tsn_in_at].tsn = tsn; 1622 asoc->in_tsnlog[asoc->tsn_in_at].strm = strmno; 1623 asoc->in_tsnlog[asoc->tsn_in_at].seq = strmseq; 1624 asoc->in_tsnlog[asoc->tsn_in_at].sz = chk_length; 1625 asoc->in_tsnlog[asoc->tsn_in_at].flgs = chunk_flags; 1626 asoc->in_tsnlog[asoc->tsn_in_at].stcb = (void *)stcb; 1627 asoc->in_tsnlog[asoc->tsn_in_at].in_pos = asoc->tsn_in_at; 1628 asoc->in_tsnlog[asoc->tsn_in_at].in_out = 1; 1629 asoc->tsn_in_at++; 1630#endif 1631 if ((chunk_flags & SCTP_DATA_FIRST_FRAG) && 1632 (TAILQ_EMPTY(&asoc->resetHead)) && 1633 (chunk_flags & SCTP_DATA_UNORDERED) == 0 && 1634 SCTP_SSN_GE(asoc->strmin[strmno].last_sequence_delivered, strmseq)) { 1635 /* The incoming sseq is behind where we last delivered? */ 1636 SCTPDBG(SCTP_DEBUG_INDATA1, "EVIL/Broken-Dup S-SEQ:%d delivered:%d from peer, Abort!\n", 1637 strmseq, asoc->strmin[strmno].last_sequence_delivered); 1638 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 1639 0, M_DONTWAIT, 1, MT_DATA); 1640 if (oper) { 1641 struct sctp_paramhdr *ph; 1642 uint32_t *ippp; 1643 1644 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + 1645 (3 * sizeof(uint32_t)); 1646 ph = mtod(oper, struct sctp_paramhdr *); 1647 ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 1648 ph->param_length = htons(SCTP_BUF_LEN(oper)); 1649 ippp = (uint32_t *) (ph + 1); 1650 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_14); 1651 ippp++; 1652 *ippp = tsn; 1653 ippp++; 1654 *ippp = ((strmno << 16) | strmseq); 1655 1656 } 1657 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_14; 1658 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED); 1659 *abort_flag = 1; 1660 return (0); 1661 } 1662 /************************************ 1663 * From here down we may find ch-> invalid 1664 * so its a good idea NOT to use it. 1665 *************************************/ 1666 1667 the_len = (chk_length - sizeof(struct sctp_data_chunk)); 1668 if (last_chunk == 0) { 1669 dmbuf = SCTP_M_COPYM(*m, 1670 (offset + sizeof(struct sctp_data_chunk)), 1671 the_len, M_DONTWAIT); 1672#ifdef SCTP_MBUF_LOGGING 1673 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 1674 struct mbuf *mat; 1675 1676 for (mat = dmbuf; mat; mat = SCTP_BUF_NEXT(mat)) { 1677 if (SCTP_BUF_IS_EXTENDED(mat)) { 1678 sctp_log_mb(mat, SCTP_MBUF_ICOPY); 1679 } 1680 } 1681 } 1682#endif 1683 } else { 1684 /* We can steal the last chunk */ 1685 int l_len; 1686 1687 dmbuf = *m; 1688 /* lop off the top part */ 1689 m_adj(dmbuf, (offset + sizeof(struct sctp_data_chunk))); 1690 if (SCTP_BUF_NEXT(dmbuf) == NULL) { 1691 l_len = SCTP_BUF_LEN(dmbuf); 1692 } else { 1693 /* 1694 * need to count up the size hopefully does not hit 1695 * this to often :-0 1696 */ 1697 struct mbuf *lat; 1698 1699 l_len = 0; 1700 for (lat = dmbuf; lat; lat = SCTP_BUF_NEXT(lat)) { 1701 l_len += SCTP_BUF_LEN(lat); 1702 } 1703 } 1704 if (l_len > the_len) { 1705 /* Trim the end round bytes off too */ 1706 m_adj(dmbuf, -(l_len - the_len)); 1707 } 1708 } 1709 if (dmbuf == NULL) { 1710 SCTP_STAT_INCR(sctps_nomem); 1711 return (0); 1712 } 1713 if ((chunk_flags & SCTP_DATA_NOT_FRAG) == SCTP_DATA_NOT_FRAG && 1714 asoc->fragmented_delivery_inprogress == 0 && 1715 TAILQ_EMPTY(&asoc->resetHead) && 1716 ((ordered == 0) || 1717 ((uint16_t) (asoc->strmin[strmno].last_sequence_delivered + 1) == strmseq && 1718 TAILQ_EMPTY(&asoc->strmin[strmno].inqueue)))) { 1719 /* Candidate for express delivery */ 1720 /* 1721 * Its not fragmented, No PD-API is up, Nothing in the 1722 * delivery queue, Its un-ordered OR ordered and the next to 1723 * deliver AND nothing else is stuck on the stream queue, 1724 * And there is room for it in the socket buffer. Lets just 1725 * stuff it up the buffer.... 1726 */ 1727 1728 /* It would be nice to avoid this copy if we could :< */ 1729 sctp_alloc_a_readq(stcb, control); 1730 sctp_build_readq_entry_mac(control, stcb, asoc->context, net, tsn, 1731 protocol_id, 1732 stcb->asoc.context, 1733 strmno, strmseq, 1734 chunk_flags, 1735 dmbuf); 1736 if (control == NULL) { 1737 goto failed_express_del; 1738 } 1739 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap); 1740 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) { 1741 asoc->highest_tsn_inside_nr_map = tsn; 1742 } 1743 sctp_add_to_readq(stcb->sctp_ep, stcb, 1744 control, &stcb->sctp_socket->so_rcv, 1745 1, SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED); 1746 1747 if ((chunk_flags & SCTP_DATA_UNORDERED) == 0) { 1748 /* for ordered, bump what we delivered */ 1749 asoc->strmin[strmno].last_sequence_delivered++; 1750 } 1751 SCTP_STAT_INCR(sctps_recvexpress); 1752 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { 1753 sctp_log_strm_del_alt(stcb, tsn, strmseq, strmno, 1754 SCTP_STR_LOG_FROM_EXPRS_DEL); 1755 } 1756 control = NULL; 1757 1758 goto finish_express_del; 1759 } 1760failed_express_del: 1761 /* If we reach here this is a new chunk */ 1762 chk = NULL; 1763 control = NULL; 1764 /* Express for fragmented delivery? */ 1765 if ((asoc->fragmented_delivery_inprogress) && 1766 (stcb->asoc.control_pdapi) && 1767 (asoc->str_of_pdapi == strmno) && 1768 (asoc->ssn_of_pdapi == strmseq) 1769 ) { 1770 control = stcb->asoc.control_pdapi; 1771 if ((chunk_flags & SCTP_DATA_FIRST_FRAG) == SCTP_DATA_FIRST_FRAG) { 1772 /* Can't be another first? */ 1773 goto failed_pdapi_express_del; 1774 } 1775 if (tsn == (control->sinfo_tsn + 1)) { 1776 /* Yep, we can add it on */ 1777 int end = 0; 1778 1779 if (chunk_flags & SCTP_DATA_LAST_FRAG) { 1780 end = 1; 1781 } 1782 if (sctp_append_to_readq(stcb->sctp_ep, stcb, control, dmbuf, end, 1783 tsn, 1784 &stcb->sctp_socket->so_rcv)) { 1785 SCTP_PRINTF("Append fails end:%d\n", end); 1786 goto failed_pdapi_express_del; 1787 } 1788 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap); 1789 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) { 1790 asoc->highest_tsn_inside_nr_map = tsn; 1791 } 1792 SCTP_STAT_INCR(sctps_recvexpressm); 1793 control->sinfo_tsn = tsn; 1794 asoc->tsn_last_delivered = tsn; 1795 asoc->fragment_flags = chunk_flags; 1796 asoc->tsn_of_pdapi_last_delivered = tsn; 1797 asoc->last_flags_delivered = chunk_flags; 1798 asoc->last_strm_seq_delivered = strmseq; 1799 asoc->last_strm_no_delivered = strmno; 1800 if (end) { 1801 /* clean up the flags and such */ 1802 asoc->fragmented_delivery_inprogress = 0; 1803 if ((chunk_flags & SCTP_DATA_UNORDERED) == 0) { 1804 asoc->strmin[strmno].last_sequence_delivered++; 1805 } 1806 stcb->asoc.control_pdapi = NULL; 1807 if (TAILQ_EMPTY(&asoc->reasmqueue) == 0) { 1808 /* 1809 * There could be another message 1810 * ready 1811 */ 1812 need_reasm_check = 1; 1813 } 1814 } 1815 control = NULL; 1816 goto finish_express_del; 1817 } 1818 } 1819failed_pdapi_express_del: 1820 control = NULL; 1821 if (SCTP_BASE_SYSCTL(sctp_do_drain) == 0) { 1822 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap); 1823 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) { 1824 asoc->highest_tsn_inside_nr_map = tsn; 1825 } 1826 } else { 1827 SCTP_SET_TSN_PRESENT(asoc->mapping_array, gap); 1828 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_map)) { 1829 asoc->highest_tsn_inside_map = tsn; 1830 } 1831 } 1832 if ((chunk_flags & SCTP_DATA_NOT_FRAG) != SCTP_DATA_NOT_FRAG) { 1833 sctp_alloc_a_chunk(stcb, chk); 1834 if (chk == NULL) { 1835 /* No memory so we drop the chunk */ 1836 SCTP_STAT_INCR(sctps_nomem); 1837 if (last_chunk == 0) { 1838 /* we copied it, free the copy */ 1839 sctp_m_freem(dmbuf); 1840 } 1841 return (0); 1842 } 1843 chk->rec.data.TSN_seq = tsn; 1844 chk->no_fr_allowed = 0; 1845 chk->rec.data.stream_seq = strmseq; 1846 chk->rec.data.stream_number = strmno; 1847 chk->rec.data.payloadtype = protocol_id; 1848 chk->rec.data.context = stcb->asoc.context; 1849 chk->rec.data.doing_fast_retransmit = 0; 1850 chk->rec.data.rcv_flags = chunk_flags; 1851 chk->asoc = asoc; 1852 chk->send_size = the_len; 1853 chk->whoTo = net; 1854 atomic_add_int(&net->ref_count, 1); 1855 chk->data = dmbuf; 1856 } else { 1857 sctp_alloc_a_readq(stcb, control); 1858 sctp_build_readq_entry_mac(control, stcb, asoc->context, net, tsn, 1859 protocol_id, 1860 stcb->asoc.context, 1861 strmno, strmseq, 1862 chunk_flags, 1863 dmbuf); 1864 if (control == NULL) { 1865 /* No memory so we drop the chunk */ 1866 SCTP_STAT_INCR(sctps_nomem); 1867 if (last_chunk == 0) { 1868 /* we copied it, free the copy */ 1869 sctp_m_freem(dmbuf); 1870 } 1871 return (0); 1872 } 1873 control->length = the_len; 1874 } 1875 1876 /* Mark it as received */ 1877 /* Now queue it where it belongs */ 1878 if (control != NULL) { 1879 /* First a sanity check */ 1880 if (asoc->fragmented_delivery_inprogress) { 1881 /* 1882 * Ok, we have a fragmented delivery in progress if 1883 * this chunk is next to deliver OR belongs in our 1884 * view to the reassembly, the peer is evil or 1885 * broken. 1886 */ 1887 uint32_t estimate_tsn; 1888 1889 estimate_tsn = asoc->tsn_last_delivered + 1; 1890 if (TAILQ_EMPTY(&asoc->reasmqueue) && 1891 (estimate_tsn == control->sinfo_tsn)) { 1892 /* Evil/Broke peer */ 1893 sctp_m_freem(control->data); 1894 control->data = NULL; 1895 if (control->whoFrom) { 1896 sctp_free_remote_addr(control->whoFrom); 1897 control->whoFrom = NULL; 1898 } 1899 sctp_free_a_readq(stcb, control); 1900 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 1901 0, M_DONTWAIT, 1, MT_DATA); 1902 if (oper) { 1903 struct sctp_paramhdr *ph; 1904 uint32_t *ippp; 1905 1906 SCTP_BUF_LEN(oper) = 1907 sizeof(struct sctp_paramhdr) + 1908 (3 * sizeof(uint32_t)); 1909 ph = mtod(oper, struct sctp_paramhdr *); 1910 ph->param_type = 1911 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 1912 ph->param_length = htons(SCTP_BUF_LEN(oper)); 1913 ippp = (uint32_t *) (ph + 1); 1914 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_15); 1915 ippp++; 1916 *ippp = tsn; 1917 ippp++; 1918 *ippp = ((strmno << 16) | strmseq); 1919 } 1920 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_15; 1921 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED); 1922 *abort_flag = 1; 1923 return (0); 1924 } else { 1925 if (sctp_does_tsn_belong_to_reasm(asoc, control->sinfo_tsn)) { 1926 sctp_m_freem(control->data); 1927 control->data = NULL; 1928 if (control->whoFrom) { 1929 sctp_free_remote_addr(control->whoFrom); 1930 control->whoFrom = NULL; 1931 } 1932 sctp_free_a_readq(stcb, control); 1933 1934 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 1935 0, M_DONTWAIT, 1, MT_DATA); 1936 if (oper) { 1937 struct sctp_paramhdr *ph; 1938 uint32_t *ippp; 1939 1940 SCTP_BUF_LEN(oper) = 1941 sizeof(struct sctp_paramhdr) + 1942 (3 * sizeof(uint32_t)); 1943 ph = mtod(oper, 1944 struct sctp_paramhdr *); 1945 ph->param_type = 1946 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 1947 ph->param_length = 1948 htons(SCTP_BUF_LEN(oper)); 1949 ippp = (uint32_t *) (ph + 1); 1950 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_16); 1951 ippp++; 1952 *ippp = tsn; 1953 ippp++; 1954 *ippp = ((strmno << 16) | strmseq); 1955 } 1956 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_16; 1957 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED); 1958 *abort_flag = 1; 1959 return (0); 1960 } 1961 } 1962 } else { 1963 /* No PDAPI running */ 1964 if (!TAILQ_EMPTY(&asoc->reasmqueue)) { 1965 /* 1966 * Reassembly queue is NOT empty validate 1967 * that this tsn does not need to be in 1968 * reasembly queue. If it does then our peer 1969 * is broken or evil. 1970 */ 1971 if (sctp_does_tsn_belong_to_reasm(asoc, control->sinfo_tsn)) { 1972 sctp_m_freem(control->data); 1973 control->data = NULL; 1974 if (control->whoFrom) { 1975 sctp_free_remote_addr(control->whoFrom); 1976 control->whoFrom = NULL; 1977 } 1978 sctp_free_a_readq(stcb, control); 1979 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 1980 0, M_DONTWAIT, 1, MT_DATA); 1981 if (oper) { 1982 struct sctp_paramhdr *ph; 1983 uint32_t *ippp; 1984 1985 SCTP_BUF_LEN(oper) = 1986 sizeof(struct sctp_paramhdr) + 1987 (3 * sizeof(uint32_t)); 1988 ph = mtod(oper, 1989 struct sctp_paramhdr *); 1990 ph->param_type = 1991 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 1992 ph->param_length = 1993 htons(SCTP_BUF_LEN(oper)); 1994 ippp = (uint32_t *) (ph + 1); 1995 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_17); 1996 ippp++; 1997 *ippp = tsn; 1998 ippp++; 1999 *ippp = ((strmno << 16) | strmseq); 2000 } 2001 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_17; 2002 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED); 2003 *abort_flag = 1; 2004 return (0); 2005 } 2006 } 2007 } 2008 /* ok, if we reach here we have passed the sanity checks */ 2009 if (chunk_flags & SCTP_DATA_UNORDERED) { 2010 /* queue directly into socket buffer */ 2011 sctp_mark_non_revokable(asoc, control->sinfo_tsn); 2012 sctp_add_to_readq(stcb->sctp_ep, stcb, 2013 control, 2014 &stcb->sctp_socket->so_rcv, 1, SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED); 2015 } else { 2016 /* 2017 * Special check for when streams are resetting. We 2018 * could be more smart about this and check the 2019 * actual stream to see if it is not being reset.. 2020 * that way we would not create a HOLB when amongst 2021 * streams being reset and those not being reset. 2022 * 2023 * We take complete messages that have a stream reset 2024 * intervening (aka the TSN is after where our 2025 * cum-ack needs to be) off and put them on a 2026 * pending_reply_queue. The reassembly ones we do 2027 * not have to worry about since they are all sorted 2028 * and proceessed by TSN order. It is only the 2029 * singletons I must worry about. 2030 */ 2031 if (((liste = TAILQ_FIRST(&asoc->resetHead)) != NULL) && 2032 SCTP_TSN_GT(tsn, liste->tsn)) { 2033 /* 2034 * yep its past where we need to reset... go 2035 * ahead and queue it. 2036 */ 2037 if (TAILQ_EMPTY(&asoc->pending_reply_queue)) { 2038 /* first one on */ 2039 TAILQ_INSERT_TAIL(&asoc->pending_reply_queue, control, next); 2040 } else { 2041 struct sctp_queued_to_read *ctlOn, 2042 *nctlOn; 2043 unsigned char inserted = 0; 2044 2045 TAILQ_FOREACH_SAFE(ctlOn, &asoc->pending_reply_queue, next, nctlOn) { 2046 if (SCTP_TSN_GT(control->sinfo_tsn, ctlOn->sinfo_tsn)) { 2047 continue; 2048 } else { 2049 /* found it */ 2050 TAILQ_INSERT_BEFORE(ctlOn, control, next); 2051 inserted = 1; 2052 break; 2053 } 2054 } 2055 if (inserted == 0) { 2056 /* 2057 * must be put at end, use 2058 * prevP (all setup from 2059 * loop) to setup nextP. 2060 */ 2061 TAILQ_INSERT_TAIL(&asoc->pending_reply_queue, control, next); 2062 } 2063 } 2064 } else { 2065 sctp_queue_data_to_stream(stcb, asoc, control, abort_flag); 2066 if (*abort_flag) { 2067 return (0); 2068 } 2069 } 2070 } 2071 } else { 2072 /* Into the re-assembly queue */ 2073 sctp_queue_data_for_reasm(stcb, asoc, chk, abort_flag); 2074 if (*abort_flag) { 2075 /* 2076 * the assoc is now gone and chk was put onto the 2077 * reasm queue, which has all been freed. 2078 */ 2079 *m = NULL; 2080 return (0); 2081 } 2082 } 2083finish_express_del: 2084 if (tsn == (asoc->cumulative_tsn + 1)) { 2085 /* Update cum-ack */ 2086 asoc->cumulative_tsn = tsn; 2087 } 2088 if (last_chunk) { 2089 *m = NULL; 2090 } 2091 if (ordered) { 2092 SCTP_STAT_INCR_COUNTER64(sctps_inorderchunks); 2093 } else { 2094 SCTP_STAT_INCR_COUNTER64(sctps_inunorderchunks); 2095 } 2096 SCTP_STAT_INCR(sctps_recvdata); 2097 /* Set it present please */ 2098 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { 2099 sctp_log_strm_del_alt(stcb, tsn, strmseq, strmno, SCTP_STR_LOG_FROM_MARK_TSN); 2100 } 2101 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 2102 sctp_log_map(asoc->mapping_array_base_tsn, asoc->cumulative_tsn, 2103 asoc->highest_tsn_inside_map, SCTP_MAP_PREPARE_SLIDE); 2104 } 2105 /* check the special flag for stream resets */ 2106 if (((liste = TAILQ_FIRST(&asoc->resetHead)) != NULL) && 2107 SCTP_TSN_GE(asoc->cumulative_tsn, liste->tsn)) { 2108 /* 2109 * we have finished working through the backlogged TSN's now 2110 * time to reset streams. 1: call reset function. 2: free 2111 * pending_reply space 3: distribute any chunks in 2112 * pending_reply_queue. 2113 */ 2114 struct sctp_queued_to_read *ctl, *nctl; 2115 2116 sctp_reset_in_stream(stcb, liste->number_entries, liste->req.list_of_streams); 2117 TAILQ_REMOVE(&asoc->resetHead, liste, next_resp); 2118 SCTP_FREE(liste, SCTP_M_STRESET); 2119 /* sa_ignore FREED_MEMORY */ 2120 liste = TAILQ_FIRST(&asoc->resetHead); 2121 if (TAILQ_EMPTY(&asoc->resetHead)) { 2122 /* All can be removed */ 2123 TAILQ_FOREACH_SAFE(ctl, &asoc->pending_reply_queue, next, nctl) { 2124 TAILQ_REMOVE(&asoc->pending_reply_queue, ctl, next); 2125 sctp_queue_data_to_stream(stcb, asoc, ctl, abort_flag); 2126 if (*abort_flag) { 2127 return (0); 2128 } 2129 } 2130 } else { 2131 TAILQ_FOREACH_SAFE(ctl, &asoc->pending_reply_queue, next, nctl) { 2132 if (SCTP_TSN_GT(ctl->sinfo_tsn, liste->tsn)) { 2133 break; 2134 } 2135 /* 2136 * if ctl->sinfo_tsn is <= liste->tsn we can 2137 * process it which is the NOT of 2138 * ctl->sinfo_tsn > liste->tsn 2139 */ 2140 TAILQ_REMOVE(&asoc->pending_reply_queue, ctl, next); 2141 sctp_queue_data_to_stream(stcb, asoc, ctl, abort_flag); 2142 if (*abort_flag) { 2143 return (0); 2144 } 2145 } 2146 } 2147 /* 2148 * Now service re-assembly to pick up anything that has been 2149 * held on reassembly queue? 2150 */ 2151 sctp_deliver_reasm_check(stcb, asoc); 2152 need_reasm_check = 0; 2153 } 2154 if (need_reasm_check) { 2155 /* Another one waits ? */ 2156 sctp_deliver_reasm_check(stcb, asoc); 2157 } 2158 return (1); 2159} 2160 2161int8_t sctp_map_lookup_tab[256] = { 2162 0, 1, 0, 2, 0, 1, 0, 3, 2163 0, 1, 0, 2, 0, 1, 0, 4, 2164 0, 1, 0, 2, 0, 1, 0, 3, 2165 0, 1, 0, 2, 0, 1, 0, 5, 2166 0, 1, 0, 2, 0, 1, 0, 3, 2167 0, 1, 0, 2, 0, 1, 0, 4, 2168 0, 1, 0, 2, 0, 1, 0, 3, 2169 0, 1, 0, 2, 0, 1, 0, 6, 2170 0, 1, 0, 2, 0, 1, 0, 3, 2171 0, 1, 0, 2, 0, 1, 0, 4, 2172 0, 1, 0, 2, 0, 1, 0, 3, 2173 0, 1, 0, 2, 0, 1, 0, 5, 2174 0, 1, 0, 2, 0, 1, 0, 3, 2175 0, 1, 0, 2, 0, 1, 0, 4, 2176 0, 1, 0, 2, 0, 1, 0, 3, 2177 0, 1, 0, 2, 0, 1, 0, 7, 2178 0, 1, 0, 2, 0, 1, 0, 3, 2179 0, 1, 0, 2, 0, 1, 0, 4, 2180 0, 1, 0, 2, 0, 1, 0, 3, 2181 0, 1, 0, 2, 0, 1, 0, 5, 2182 0, 1, 0, 2, 0, 1, 0, 3, 2183 0, 1, 0, 2, 0, 1, 0, 4, 2184 0, 1, 0, 2, 0, 1, 0, 3, 2185 0, 1, 0, 2, 0, 1, 0, 6, 2186 0, 1, 0, 2, 0, 1, 0, 3, 2187 0, 1, 0, 2, 0, 1, 0, 4, 2188 0, 1, 0, 2, 0, 1, 0, 3, 2189 0, 1, 0, 2, 0, 1, 0, 5, 2190 0, 1, 0, 2, 0, 1, 0, 3, 2191 0, 1, 0, 2, 0, 1, 0, 4, 2192 0, 1, 0, 2, 0, 1, 0, 3, 2193 0, 1, 0, 2, 0, 1, 0, 8 2194}; 2195 2196 2197void 2198sctp_slide_mapping_arrays(struct sctp_tcb *stcb) 2199{ 2200 /* 2201 * Now we also need to check the mapping array in a couple of ways. 2202 * 1) Did we move the cum-ack point? 2203 * 2204 * When you first glance at this you might think that all entries that 2205 * make up the postion of the cum-ack would be in the nr-mapping 2206 * array only.. i.e. things up to the cum-ack are always 2207 * deliverable. Thats true with one exception, when its a fragmented 2208 * message we may not deliver the data until some threshold (or all 2209 * of it) is in place. So we must OR the nr_mapping_array and 2210 * mapping_array to get a true picture of the cum-ack. 2211 */ 2212 struct sctp_association *asoc; 2213 int at; 2214 uint8_t val; 2215 int slide_from, slide_end, lgap, distance; 2216 uint32_t old_cumack, old_base, old_highest, highest_tsn; 2217 2218 asoc = &stcb->asoc; 2219 2220 old_cumack = asoc->cumulative_tsn; 2221 old_base = asoc->mapping_array_base_tsn; 2222 old_highest = asoc->highest_tsn_inside_map; 2223 /* 2224 * We could probably improve this a small bit by calculating the 2225 * offset of the current cum-ack as the starting point. 2226 */ 2227 at = 0; 2228 for (slide_from = 0; slide_from < stcb->asoc.mapping_array_size; slide_from++) { 2229 val = asoc->nr_mapping_array[slide_from] | asoc->mapping_array[slide_from]; 2230 if (val == 0xff) { 2231 at += 8; 2232 } else { 2233 /* there is a 0 bit */ 2234 at += sctp_map_lookup_tab[val]; 2235 break; 2236 } 2237 } 2238 asoc->cumulative_tsn = asoc->mapping_array_base_tsn + (at - 1); 2239 2240 if (SCTP_TSN_GT(asoc->cumulative_tsn, asoc->highest_tsn_inside_map) && 2241 SCTP_TSN_GT(asoc->cumulative_tsn, asoc->highest_tsn_inside_nr_map)) { 2242#ifdef INVARIANTS 2243 panic("huh, cumack 0x%x greater than high-tsn 0x%x in map", 2244 asoc->cumulative_tsn, asoc->highest_tsn_inside_map); 2245#else 2246 SCTP_PRINTF("huh, cumack 0x%x greater than high-tsn 0x%x in map - should panic?\n", 2247 asoc->cumulative_tsn, asoc->highest_tsn_inside_map); 2248 sctp_print_mapping_array(asoc); 2249 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 2250 sctp_log_map(0, 6, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 2251 } 2252 asoc->highest_tsn_inside_map = asoc->cumulative_tsn; 2253 asoc->highest_tsn_inside_nr_map = asoc->cumulative_tsn; 2254#endif 2255 } 2256 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->highest_tsn_inside_map)) { 2257 highest_tsn = asoc->highest_tsn_inside_nr_map; 2258 } else { 2259 highest_tsn = asoc->highest_tsn_inside_map; 2260 } 2261 if ((asoc->cumulative_tsn == highest_tsn) && (at >= 8)) { 2262 /* The complete array was completed by a single FR */ 2263 /* highest becomes the cum-ack */ 2264 int clr; 2265 2266#ifdef INVARIANTS 2267 unsigned int i; 2268 2269#endif 2270 2271 /* clear the array */ 2272 clr = ((at + 7) >> 3); 2273 if (clr > asoc->mapping_array_size) { 2274 clr = asoc->mapping_array_size; 2275 } 2276 memset(asoc->mapping_array, 0, clr); 2277 memset(asoc->nr_mapping_array, 0, clr); 2278#ifdef INVARIANTS 2279 for (i = 0; i < asoc->mapping_array_size; i++) { 2280 if ((asoc->mapping_array[i]) || (asoc->nr_mapping_array[i])) { 2281 SCTP_PRINTF("Error Mapping array's not clean at clear\n"); 2282 sctp_print_mapping_array(asoc); 2283 } 2284 } 2285#endif 2286 asoc->mapping_array_base_tsn = asoc->cumulative_tsn + 1; 2287 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map = asoc->cumulative_tsn; 2288 } else if (at >= 8) { 2289 /* we can slide the mapping array down */ 2290 /* slide_from holds where we hit the first NON 0xff byte */ 2291 2292 /* 2293 * now calculate the ceiling of the move using our highest 2294 * TSN value 2295 */ 2296 SCTP_CALC_TSN_TO_GAP(lgap, highest_tsn, asoc->mapping_array_base_tsn); 2297 slide_end = (lgap >> 3); 2298 if (slide_end < slide_from) { 2299 sctp_print_mapping_array(asoc); 2300#ifdef INVARIANTS 2301 panic("impossible slide"); 2302#else 2303 SCTP_PRINTF("impossible slide lgap:%x slide_end:%x slide_from:%x? at:%d\n", 2304 lgap, slide_end, slide_from, at); 2305 return; 2306#endif 2307 } 2308 if (slide_end > asoc->mapping_array_size) { 2309#ifdef INVARIANTS 2310 panic("would overrun buffer"); 2311#else 2312 SCTP_PRINTF("Gak, would have overrun map end:%d slide_end:%d\n", 2313 asoc->mapping_array_size, slide_end); 2314 slide_end = asoc->mapping_array_size; 2315#endif 2316 } 2317 distance = (slide_end - slide_from) + 1; 2318 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 2319 sctp_log_map(old_base, old_cumack, old_highest, 2320 SCTP_MAP_PREPARE_SLIDE); 2321 sctp_log_map((uint32_t) slide_from, (uint32_t) slide_end, 2322 (uint32_t) lgap, SCTP_MAP_SLIDE_FROM); 2323 } 2324 if (distance + slide_from > asoc->mapping_array_size || 2325 distance < 0) { 2326 /* 2327 * Here we do NOT slide forward the array so that 2328 * hopefully when more data comes in to fill it up 2329 * we will be able to slide it forward. Really I 2330 * don't think this should happen :-0 2331 */ 2332 2333 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 2334 sctp_log_map((uint32_t) distance, (uint32_t) slide_from, 2335 (uint32_t) asoc->mapping_array_size, 2336 SCTP_MAP_SLIDE_NONE); 2337 } 2338 } else { 2339 int ii; 2340 2341 for (ii = 0; ii < distance; ii++) { 2342 asoc->mapping_array[ii] = asoc->mapping_array[slide_from + ii]; 2343 asoc->nr_mapping_array[ii] = asoc->nr_mapping_array[slide_from + ii]; 2344 2345 } 2346 for (ii = distance; ii < asoc->mapping_array_size; ii++) { 2347 asoc->mapping_array[ii] = 0; 2348 asoc->nr_mapping_array[ii] = 0; 2349 } 2350 if (asoc->highest_tsn_inside_map + 1 == asoc->mapping_array_base_tsn) { 2351 asoc->highest_tsn_inside_map += (slide_from << 3); 2352 } 2353 if (asoc->highest_tsn_inside_nr_map + 1 == asoc->mapping_array_base_tsn) { 2354 asoc->highest_tsn_inside_nr_map += (slide_from << 3); 2355 } 2356 asoc->mapping_array_base_tsn += (slide_from << 3); 2357 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 2358 sctp_log_map(asoc->mapping_array_base_tsn, 2359 asoc->cumulative_tsn, asoc->highest_tsn_inside_map, 2360 SCTP_MAP_SLIDE_RESULT); 2361 } 2362 } 2363 } 2364} 2365 2366void 2367sctp_sack_check(struct sctp_tcb *stcb, int was_a_gap) 2368{ 2369 struct sctp_association *asoc; 2370 uint32_t highest_tsn; 2371 2372 asoc = &stcb->asoc; 2373 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->highest_tsn_inside_map)) { 2374 highest_tsn = asoc->highest_tsn_inside_nr_map; 2375 } else { 2376 highest_tsn = asoc->highest_tsn_inside_map; 2377 } 2378 2379 /* 2380 * Now we need to see if we need to queue a sack or just start the 2381 * timer (if allowed). 2382 */ 2383 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 2384 /* 2385 * Ok special case, in SHUTDOWN-SENT case. here we maker 2386 * sure SACK timer is off and instead send a SHUTDOWN and a 2387 * SACK 2388 */ 2389 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) { 2390 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, 2391 stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_INDATA + SCTP_LOC_18); 2392 } 2393 sctp_send_shutdown(stcb, 2394 ((stcb->asoc.alternate) ? stcb->asoc.alternate : stcb->asoc.primary_destination)); 2395 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 2396 } else { 2397 int is_a_gap; 2398 2399 /* is there a gap now ? */ 2400 is_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 2401 2402 /* 2403 * CMT DAC algorithm: increase number of packets received 2404 * since last ack 2405 */ 2406 stcb->asoc.cmt_dac_pkts_rcvd++; 2407 2408 if ((stcb->asoc.send_sack == 1) || /* We need to send a 2409 * SACK */ 2410 ((was_a_gap) && (is_a_gap == 0)) || /* was a gap, but no 2411 * longer is one */ 2412 (stcb->asoc.numduptsns) || /* we have dup's */ 2413 (is_a_gap) || /* is still a gap */ 2414 (stcb->asoc.delayed_ack == 0) || /* Delayed sack disabled */ 2415 (stcb->asoc.data_pkts_seen >= stcb->asoc.sack_freq) /* hit limit of pkts */ 2416 ) { 2417 2418 if ((stcb->asoc.sctp_cmt_on_off > 0) && 2419 (SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) && 2420 (stcb->asoc.send_sack == 0) && 2421 (stcb->asoc.numduptsns == 0) && 2422 (stcb->asoc.delayed_ack) && 2423 (!SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer))) { 2424 2425 /* 2426 * CMT DAC algorithm: With CMT, delay acks 2427 * even in the face of 2428 * 2429 * reordering. Therefore, if acks that do not 2430 * have to be sent because of the above 2431 * reasons, will be delayed. That is, acks 2432 * that would have been sent due to gap 2433 * reports will be delayed with DAC. Start 2434 * the delayed ack timer. 2435 */ 2436 sctp_timer_start(SCTP_TIMER_TYPE_RECV, 2437 stcb->sctp_ep, stcb, NULL); 2438 } else { 2439 /* 2440 * Ok we must build a SACK since the timer 2441 * is pending, we got our first packet OR 2442 * there are gaps or duplicates. 2443 */ 2444 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer); 2445 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 2446 } 2447 } else { 2448 if (!SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) { 2449 sctp_timer_start(SCTP_TIMER_TYPE_RECV, 2450 stcb->sctp_ep, stcb, NULL); 2451 } 2452 } 2453 } 2454} 2455 2456void 2457sctp_service_queues(struct sctp_tcb *stcb, struct sctp_association *asoc) 2458{ 2459 struct sctp_tmit_chunk *chk; 2460 uint32_t tsize, pd_point; 2461 uint16_t nxt_todel; 2462 2463 if (asoc->fragmented_delivery_inprogress) { 2464 sctp_service_reassembly(stcb, asoc); 2465 } 2466 /* Can we proceed further, i.e. the PD-API is complete */ 2467 if (asoc->fragmented_delivery_inprogress) { 2468 /* no */ 2469 return; 2470 } 2471 /* 2472 * Now is there some other chunk I can deliver from the reassembly 2473 * queue. 2474 */ 2475doit_again: 2476 chk = TAILQ_FIRST(&asoc->reasmqueue); 2477 if (chk == NULL) { 2478 asoc->size_on_reasm_queue = 0; 2479 asoc->cnt_on_reasm_queue = 0; 2480 return; 2481 } 2482 nxt_todel = asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered + 1; 2483 if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) && 2484 ((nxt_todel == chk->rec.data.stream_seq) || 2485 (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED))) { 2486 /* 2487 * Yep the first one is here. We setup to start reception, 2488 * by backing down the TSN just in case we can't deliver. 2489 */ 2490 2491 /* 2492 * Before we start though either all of the message should 2493 * be here or the socket buffer max or nothing on the 2494 * delivery queue and something can be delivered. 2495 */ 2496 if (stcb->sctp_socket) { 2497 pd_point = min(SCTP_SB_LIMIT_RCV(stcb->sctp_socket), 2498 stcb->sctp_ep->partial_delivery_point); 2499 } else { 2500 pd_point = stcb->sctp_ep->partial_delivery_point; 2501 } 2502 if (sctp_is_all_msg_on_reasm(asoc, &tsize) || (tsize >= pd_point)) { 2503 asoc->fragmented_delivery_inprogress = 1; 2504 asoc->tsn_last_delivered = chk->rec.data.TSN_seq - 1; 2505 asoc->str_of_pdapi = chk->rec.data.stream_number; 2506 asoc->ssn_of_pdapi = chk->rec.data.stream_seq; 2507 asoc->pdapi_ppid = chk->rec.data.payloadtype; 2508 asoc->fragment_flags = chk->rec.data.rcv_flags; 2509 sctp_service_reassembly(stcb, asoc); 2510 if (asoc->fragmented_delivery_inprogress == 0) { 2511 goto doit_again; 2512 } 2513 } 2514 } 2515} 2516 2517int 2518sctp_process_data(struct mbuf **mm, int iphlen, int *offset, int length, 2519 struct sctphdr *sh, struct sctp_inpcb *inp, 2520 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t * high_tsn, 2521 uint8_t use_mflowid, uint32_t mflowid, 2522 uint32_t vrf_id, uint16_t port) 2523{ 2524 struct sctp_data_chunk *ch, chunk_buf; 2525 struct sctp_association *asoc; 2526 int num_chunks = 0; /* number of control chunks processed */ 2527 int stop_proc = 0; 2528 int chk_length, break_flag, last_chunk; 2529 int abort_flag = 0, was_a_gap; 2530 struct mbuf *m; 2531 uint32_t highest_tsn; 2532 2533 /* set the rwnd */ 2534 sctp_set_rwnd(stcb, &stcb->asoc); 2535 2536 m = *mm; 2537 SCTP_TCB_LOCK_ASSERT(stcb); 2538 asoc = &stcb->asoc; 2539 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->highest_tsn_inside_map)) { 2540 highest_tsn = asoc->highest_tsn_inside_nr_map; 2541 } else { 2542 highest_tsn = asoc->highest_tsn_inside_map; 2543 } 2544 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 2545 /* 2546 * setup where we got the last DATA packet from for any SACK that 2547 * may need to go out. Don't bump the net. This is done ONLY when a 2548 * chunk is assigned. 2549 */ 2550 asoc->last_data_chunk_from = net; 2551 2552 /*- 2553 * Now before we proceed we must figure out if this is a wasted 2554 * cluster... i.e. it is a small packet sent in and yet the driver 2555 * underneath allocated a full cluster for it. If so we must copy it 2556 * to a smaller mbuf and free up the cluster mbuf. This will help 2557 * with cluster starvation. Note for __Panda__ we don't do this 2558 * since it has clusters all the way down to 64 bytes. 2559 */ 2560 if (SCTP_BUF_LEN(m) < (long)MLEN && SCTP_BUF_NEXT(m) == NULL) { 2561 /* we only handle mbufs that are singletons.. not chains */ 2562 m = sctp_get_mbuf_for_msg(SCTP_BUF_LEN(m), 0, M_DONTWAIT, 1, MT_DATA); 2563 if (m) { 2564 /* ok lets see if we can copy the data up */ 2565 caddr_t *from, *to; 2566 2567 /* get the pointers and copy */ 2568 to = mtod(m, caddr_t *); 2569 from = mtod((*mm), caddr_t *); 2570 memcpy(to, from, SCTP_BUF_LEN((*mm))); 2571 /* copy the length and free up the old */ 2572 SCTP_BUF_LEN(m) = SCTP_BUF_LEN((*mm)); 2573 sctp_m_freem(*mm); 2574 /* sucess, back copy */ 2575 *mm = m; 2576 } else { 2577 /* We are in trouble in the mbuf world .. yikes */ 2578 m = *mm; 2579 } 2580 } 2581 /* get pointer to the first chunk header */ 2582 ch = (struct sctp_data_chunk *)sctp_m_getptr(m, *offset, 2583 sizeof(struct sctp_data_chunk), (uint8_t *) & chunk_buf); 2584 if (ch == NULL) { 2585 return (1); 2586 } 2587 /* 2588 * process all DATA chunks... 2589 */ 2590 *high_tsn = asoc->cumulative_tsn; 2591 break_flag = 0; 2592 asoc->data_pkts_seen++; 2593 while (stop_proc == 0) { 2594 /* validate chunk length */ 2595 chk_length = ntohs(ch->ch.chunk_length); 2596 if (length - *offset < chk_length) { 2597 /* all done, mutulated chunk */ 2598 stop_proc = 1; 2599 continue; 2600 } 2601 if (ch->ch.chunk_type == SCTP_DATA) { 2602 if ((size_t)chk_length < sizeof(struct sctp_data_chunk) + 1) { 2603 /* 2604 * Need to send an abort since we had a 2605 * invalid data chunk. 2606 */ 2607 struct mbuf *op_err; 2608 2609 op_err = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 2 * sizeof(uint32_t)), 2610 0, M_DONTWAIT, 1, MT_DATA); 2611 2612 if (op_err) { 2613 struct sctp_paramhdr *ph; 2614 uint32_t *ippp; 2615 2616 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr) + 2617 (2 * sizeof(uint32_t)); 2618 ph = mtod(op_err, struct sctp_paramhdr *); 2619 ph->param_type = 2620 htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 2621 ph->param_length = htons(SCTP_BUF_LEN(op_err)); 2622 ippp = (uint32_t *) (ph + 1); 2623 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_19); 2624 ippp++; 2625 *ippp = asoc->cumulative_tsn; 2626 2627 } 2628 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_19; 2629 sctp_abort_association(inp, stcb, m, iphlen, sh, 2630 op_err, 2631 use_mflowid, mflowid, 2632 vrf_id, port); 2633 return (2); 2634 } 2635#ifdef SCTP_AUDITING_ENABLED 2636 sctp_audit_log(0xB1, 0); 2637#endif 2638 if (SCTP_SIZE32(chk_length) == (length - *offset)) { 2639 last_chunk = 1; 2640 } else { 2641 last_chunk = 0; 2642 } 2643 if (sctp_process_a_data_chunk(stcb, asoc, mm, *offset, ch, 2644 chk_length, net, high_tsn, &abort_flag, &break_flag, 2645 last_chunk)) { 2646 num_chunks++; 2647 } 2648 if (abort_flag) 2649 return (2); 2650 2651 if (break_flag) { 2652 /* 2653 * Set because of out of rwnd space and no 2654 * drop rep space left. 2655 */ 2656 stop_proc = 1; 2657 continue; 2658 } 2659 } else { 2660 /* not a data chunk in the data region */ 2661 switch (ch->ch.chunk_type) { 2662 case SCTP_INITIATION: 2663 case SCTP_INITIATION_ACK: 2664 case SCTP_SELECTIVE_ACK: 2665 case SCTP_NR_SELECTIVE_ACK: 2666 case SCTP_HEARTBEAT_REQUEST: 2667 case SCTP_HEARTBEAT_ACK: 2668 case SCTP_ABORT_ASSOCIATION: 2669 case SCTP_SHUTDOWN: 2670 case SCTP_SHUTDOWN_ACK: 2671 case SCTP_OPERATION_ERROR: 2672 case SCTP_COOKIE_ECHO: 2673 case SCTP_COOKIE_ACK: 2674 case SCTP_ECN_ECHO: 2675 case SCTP_ECN_CWR: 2676 case SCTP_SHUTDOWN_COMPLETE: 2677 case SCTP_AUTHENTICATION: 2678 case SCTP_ASCONF_ACK: 2679 case SCTP_PACKET_DROPPED: 2680 case SCTP_STREAM_RESET: 2681 case SCTP_FORWARD_CUM_TSN: 2682 case SCTP_ASCONF: 2683 /* 2684 * Now, what do we do with KNOWN chunks that 2685 * are NOT in the right place? 2686 * 2687 * For now, I do nothing but ignore them. We 2688 * may later want to add sysctl stuff to 2689 * switch out and do either an ABORT() or 2690 * possibly process them. 2691 */ 2692 if (SCTP_BASE_SYSCTL(sctp_strict_data_order)) { 2693 struct mbuf *op_err; 2694 2695 op_err = sctp_generate_invmanparam(SCTP_CAUSE_PROTOCOL_VIOLATION); 2696 sctp_abort_association(inp, stcb, 2697 m, iphlen, 2698 sh, op_err, 2699 use_mflowid, mflowid, 2700 vrf_id, port); 2701 return (2); 2702 } 2703 break; 2704 default: 2705 /* unknown chunk type, use bit rules */ 2706 if (ch->ch.chunk_type & 0x40) { 2707 /* Add a error report to the queue */ 2708 struct mbuf *merr; 2709 struct sctp_paramhdr *phd; 2710 2711 merr = sctp_get_mbuf_for_msg(sizeof(*phd), 0, M_DONTWAIT, 1, MT_DATA); 2712 if (merr) { 2713 phd = mtod(merr, struct sctp_paramhdr *); 2714 /* 2715 * We cheat and use param 2716 * type since we did not 2717 * bother to define a error 2718 * cause struct. They are 2719 * the same basic format 2720 * with different names. 2721 */ 2722 phd->param_type = 2723 htons(SCTP_CAUSE_UNRECOG_CHUNK); 2724 phd->param_length = 2725 htons(chk_length + sizeof(*phd)); 2726 SCTP_BUF_LEN(merr) = sizeof(*phd); 2727 SCTP_BUF_NEXT(merr) = SCTP_M_COPYM(m, *offset, chk_length, M_DONTWAIT); 2728 if (SCTP_BUF_NEXT(merr)) { 2729 if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(merr), SCTP_SIZE32(chk_length) - chk_length, NULL)) { 2730 sctp_m_freem(merr); 2731 } else { 2732 sctp_queue_op_err(stcb, merr); 2733 } 2734 } else { 2735 sctp_m_freem(merr); 2736 } 2737 } 2738 } 2739 if ((ch->ch.chunk_type & 0x80) == 0) { 2740 /* discard the rest of this packet */ 2741 stop_proc = 1; 2742 } /* else skip this bad chunk and 2743 * continue... */ 2744 break; 2745 } /* switch of chunk type */ 2746 } 2747 *offset += SCTP_SIZE32(chk_length); 2748 if ((*offset >= length) || stop_proc) { 2749 /* no more data left in the mbuf chain */ 2750 stop_proc = 1; 2751 continue; 2752 } 2753 ch = (struct sctp_data_chunk *)sctp_m_getptr(m, *offset, 2754 sizeof(struct sctp_data_chunk), (uint8_t *) & chunk_buf); 2755 if (ch == NULL) { 2756 *offset = length; 2757 stop_proc = 1; 2758 continue; 2759 } 2760 } 2761 if (break_flag) { 2762 /* 2763 * we need to report rwnd overrun drops. 2764 */ 2765 sctp_send_packet_dropped(stcb, net, *mm, length, iphlen, 0); 2766 } 2767 if (num_chunks) { 2768 /* 2769 * Did we get data, if so update the time for auto-close and 2770 * give peer credit for being alive. 2771 */ 2772 SCTP_STAT_INCR(sctps_recvpktwithdata); 2773 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 2774 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 2775 stcb->asoc.overall_error_count, 2776 0, 2777 SCTP_FROM_SCTP_INDATA, 2778 __LINE__); 2779 } 2780 stcb->asoc.overall_error_count = 0; 2781 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_last_rcvd); 2782 } 2783 /* now service all of the reassm queue if needed */ 2784 if (!(TAILQ_EMPTY(&asoc->reasmqueue))) 2785 sctp_service_queues(stcb, asoc); 2786 2787 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 2788 /* Assure that we ack right away */ 2789 stcb->asoc.send_sack = 1; 2790 } 2791 /* Start a sack timer or QUEUE a SACK for sending */ 2792 sctp_sack_check(stcb, was_a_gap); 2793 return (0); 2794} 2795 2796static int 2797sctp_process_segment_range(struct sctp_tcb *stcb, struct sctp_tmit_chunk **p_tp1, uint32_t last_tsn, 2798 uint16_t frag_strt, uint16_t frag_end, int nr_sacking, 2799 int *num_frs, 2800 uint32_t * biggest_newly_acked_tsn, 2801 uint32_t * this_sack_lowest_newack, 2802 int *rto_ok) 2803{ 2804 struct sctp_tmit_chunk *tp1; 2805 unsigned int theTSN; 2806 int j, wake_him = 0, circled = 0; 2807 2808 /* Recover the tp1 we last saw */ 2809 tp1 = *p_tp1; 2810 if (tp1 == NULL) { 2811 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue); 2812 } 2813 for (j = frag_strt; j <= frag_end; j++) { 2814 theTSN = j + last_tsn; 2815 while (tp1) { 2816 if (tp1->rec.data.doing_fast_retransmit) 2817 (*num_frs) += 1; 2818 2819 /*- 2820 * CMT: CUCv2 algorithm. For each TSN being 2821 * processed from the sent queue, track the 2822 * next expected pseudo-cumack, or 2823 * rtx_pseudo_cumack, if required. Separate 2824 * cumack trackers for first transmissions, 2825 * and retransmissions. 2826 */ 2827 if ((tp1->whoTo->find_pseudo_cumack == 1) && (tp1->sent < SCTP_DATAGRAM_RESEND) && 2828 (tp1->snd_count == 1)) { 2829 tp1->whoTo->pseudo_cumack = tp1->rec.data.TSN_seq; 2830 tp1->whoTo->find_pseudo_cumack = 0; 2831 } 2832 if ((tp1->whoTo->find_rtx_pseudo_cumack == 1) && (tp1->sent < SCTP_DATAGRAM_RESEND) && 2833 (tp1->snd_count > 1)) { 2834 tp1->whoTo->rtx_pseudo_cumack = tp1->rec.data.TSN_seq; 2835 tp1->whoTo->find_rtx_pseudo_cumack = 0; 2836 } 2837 if (tp1->rec.data.TSN_seq == theTSN) { 2838 if (tp1->sent != SCTP_DATAGRAM_UNSENT) { 2839 /*- 2840 * must be held until 2841 * cum-ack passes 2842 */ 2843 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 2844 /*- 2845 * If it is less than RESEND, it is 2846 * now no-longer in flight. 2847 * Higher values may already be set 2848 * via previous Gap Ack Blocks... 2849 * i.e. ACKED or RESEND. 2850 */ 2851 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, 2852 *biggest_newly_acked_tsn)) { 2853 *biggest_newly_acked_tsn = tp1->rec.data.TSN_seq; 2854 } 2855 /*- 2856 * CMT: SFR algo (and HTNA) - set 2857 * saw_newack to 1 for dest being 2858 * newly acked. update 2859 * this_sack_highest_newack if 2860 * appropriate. 2861 */ 2862 if (tp1->rec.data.chunk_was_revoked == 0) 2863 tp1->whoTo->saw_newack = 1; 2864 2865 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, 2866 tp1->whoTo->this_sack_highest_newack)) { 2867 tp1->whoTo->this_sack_highest_newack = 2868 tp1->rec.data.TSN_seq; 2869 } 2870 /*- 2871 * CMT DAC algo: also update 2872 * this_sack_lowest_newack 2873 */ 2874 if (*this_sack_lowest_newack == 0) { 2875 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 2876 sctp_log_sack(*this_sack_lowest_newack, 2877 last_tsn, 2878 tp1->rec.data.TSN_seq, 2879 0, 2880 0, 2881 SCTP_LOG_TSN_ACKED); 2882 } 2883 *this_sack_lowest_newack = tp1->rec.data.TSN_seq; 2884 } 2885 /*- 2886 * CMT: CUCv2 algorithm. If (rtx-)pseudo-cumack for corresp 2887 * dest is being acked, then we have a new (rtx-)pseudo-cumack. Set 2888 * new_(rtx_)pseudo_cumack to TRUE so that the cwnd for this dest can be 2889 * updated. Also trigger search for the next expected (rtx-)pseudo-cumack. 2890 * Separate pseudo_cumack trackers for first transmissions and 2891 * retransmissions. 2892 */ 2893 if (tp1->rec.data.TSN_seq == tp1->whoTo->pseudo_cumack) { 2894 if (tp1->rec.data.chunk_was_revoked == 0) { 2895 tp1->whoTo->new_pseudo_cumack = 1; 2896 } 2897 tp1->whoTo->find_pseudo_cumack = 1; 2898 } 2899 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 2900 sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK); 2901 } 2902 if (tp1->rec.data.TSN_seq == tp1->whoTo->rtx_pseudo_cumack) { 2903 if (tp1->rec.data.chunk_was_revoked == 0) { 2904 tp1->whoTo->new_pseudo_cumack = 1; 2905 } 2906 tp1->whoTo->find_rtx_pseudo_cumack = 1; 2907 } 2908 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 2909 sctp_log_sack(*biggest_newly_acked_tsn, 2910 last_tsn, 2911 tp1->rec.data.TSN_seq, 2912 frag_strt, 2913 frag_end, 2914 SCTP_LOG_TSN_ACKED); 2915 } 2916 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 2917 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_GAP, 2918 tp1->whoTo->flight_size, 2919 tp1->book_size, 2920 (uintptr_t) tp1->whoTo, 2921 tp1->rec.data.TSN_seq); 2922 } 2923 sctp_flight_size_decrease(tp1); 2924 if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) { 2925 (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo, 2926 tp1); 2927 } 2928 sctp_total_flight_decrease(stcb, tp1); 2929 2930 tp1->whoTo->net_ack += tp1->send_size; 2931 if (tp1->snd_count < 2) { 2932 /*- 2933 * True non-retransmited chunk 2934 */ 2935 tp1->whoTo->net_ack2 += tp1->send_size; 2936 2937 /*- 2938 * update RTO too ? 2939 */ 2940 if (tp1->do_rtt) { 2941 if (*rto_ok) { 2942 tp1->whoTo->RTO = 2943 sctp_calculate_rto(stcb, 2944 &stcb->asoc, 2945 tp1->whoTo, 2946 &tp1->sent_rcv_time, 2947 sctp_align_safe_nocopy, 2948 SCTP_RTT_FROM_DATA); 2949 *rto_ok = 0; 2950 } 2951 if (tp1->whoTo->rto_needed == 0) { 2952 tp1->whoTo->rto_needed = 1; 2953 } 2954 tp1->do_rtt = 0; 2955 } 2956 } 2957 } 2958 if (tp1->sent <= SCTP_DATAGRAM_RESEND) { 2959 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, 2960 stcb->asoc.this_sack_highest_gap)) { 2961 stcb->asoc.this_sack_highest_gap = 2962 tp1->rec.data.TSN_seq; 2963 } 2964 if (tp1->sent == SCTP_DATAGRAM_RESEND) { 2965 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt); 2966#ifdef SCTP_AUDITING_ENABLED 2967 sctp_audit_log(0xB2, 2968 (stcb->asoc.sent_queue_retran_cnt & 0x000000ff)); 2969#endif 2970 } 2971 } 2972 /*- 2973 * All chunks NOT UNSENT fall through here and are marked 2974 * (leave PR-SCTP ones that are to skip alone though) 2975 */ 2976 if (tp1->sent != SCTP_FORWARD_TSN_SKIP) 2977 tp1->sent = SCTP_DATAGRAM_MARKED; 2978 2979 if (tp1->rec.data.chunk_was_revoked) { 2980 /* deflate the cwnd */ 2981 tp1->whoTo->cwnd -= tp1->book_size; 2982 tp1->rec.data.chunk_was_revoked = 0; 2983 } 2984 /* NR Sack code here */ 2985 if (nr_sacking) { 2986 if (tp1->data) { 2987 /* 2988 * sa_ignore 2989 * NO_NULL_CHK 2990 */ 2991 sctp_free_bufspace(stcb, &stcb->asoc, tp1, 1); 2992 sctp_m_freem(tp1->data); 2993 tp1->data = NULL; 2994 } 2995 wake_him++; 2996 } 2997 } 2998 break; 2999 } /* if (tp1->TSN_seq == theTSN) */ 3000 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, theTSN)) { 3001 break; 3002 } 3003 tp1 = TAILQ_NEXT(tp1, sctp_next); 3004 if ((tp1 == NULL) && (circled == 0)) { 3005 circled++; 3006 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue); 3007 } 3008 } /* end while (tp1) */ 3009 if (tp1 == NULL) { 3010 circled = 0; 3011 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue); 3012 } 3013 /* In case the fragments were not in order we must reset */ 3014 } /* end for (j = fragStart */ 3015 *p_tp1 = tp1; 3016 return (wake_him); /* Return value only used for nr-sack */ 3017} 3018 3019 3020static int 3021sctp_handle_segments(struct mbuf *m, int *offset, struct sctp_tcb *stcb, struct sctp_association *asoc, 3022 uint32_t last_tsn, uint32_t * biggest_tsn_acked, 3023 uint32_t * biggest_newly_acked_tsn, uint32_t * this_sack_lowest_newack, 3024 int num_seg, int num_nr_seg, int *rto_ok) 3025{ 3026 struct sctp_gap_ack_block *frag, block; 3027 struct sctp_tmit_chunk *tp1; 3028 int i; 3029 int num_frs = 0; 3030 int chunk_freed; 3031 int non_revocable; 3032 uint16_t frag_strt, frag_end, prev_frag_end; 3033 3034 tp1 = TAILQ_FIRST(&asoc->sent_queue); 3035 prev_frag_end = 0; 3036 chunk_freed = 0; 3037 3038 for (i = 0; i < (num_seg + num_nr_seg); i++) { 3039 if (i == num_seg) { 3040 prev_frag_end = 0; 3041 tp1 = TAILQ_FIRST(&asoc->sent_queue); 3042 } 3043 frag = (struct sctp_gap_ack_block *)sctp_m_getptr(m, *offset, 3044 sizeof(struct sctp_gap_ack_block), (uint8_t *) & block); 3045 *offset += sizeof(block); 3046 if (frag == NULL) { 3047 return (chunk_freed); 3048 } 3049 frag_strt = ntohs(frag->start); 3050 frag_end = ntohs(frag->end); 3051 3052 if (frag_strt > frag_end) { 3053 /* This gap report is malformed, skip it. */ 3054 continue; 3055 } 3056 if (frag_strt <= prev_frag_end) { 3057 /* This gap report is not in order, so restart. */ 3058 tp1 = TAILQ_FIRST(&asoc->sent_queue); 3059 } 3060 if (SCTP_TSN_GT((last_tsn + frag_end), *biggest_tsn_acked)) { 3061 *biggest_tsn_acked = last_tsn + frag_end; 3062 } 3063 if (i < num_seg) { 3064 non_revocable = 0; 3065 } else { 3066 non_revocable = 1; 3067 } 3068 if (sctp_process_segment_range(stcb, &tp1, last_tsn, frag_strt, frag_end, 3069 non_revocable, &num_frs, biggest_newly_acked_tsn, 3070 this_sack_lowest_newack, rto_ok)) { 3071 chunk_freed = 1; 3072 } 3073 prev_frag_end = frag_end; 3074 } 3075 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3076 if (num_frs) 3077 sctp_log_fr(*biggest_tsn_acked, 3078 *biggest_newly_acked_tsn, 3079 last_tsn, SCTP_FR_LOG_BIGGEST_TSNS); 3080 } 3081 return (chunk_freed); 3082} 3083 3084static void 3085sctp_check_for_revoked(struct sctp_tcb *stcb, 3086 struct sctp_association *asoc, uint32_t cumack, 3087 uint32_t biggest_tsn_acked) 3088{ 3089 struct sctp_tmit_chunk *tp1; 3090 int tot_revoked = 0; 3091 3092 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 3093 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, cumack)) { 3094 /* 3095 * ok this guy is either ACK or MARKED. If it is 3096 * ACKED it has been previously acked but not this 3097 * time i.e. revoked. If it is MARKED it was ACK'ed 3098 * again. 3099 */ 3100 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, biggest_tsn_acked)) { 3101 break; 3102 } 3103 if (tp1->sent == SCTP_DATAGRAM_ACKED) { 3104 /* it has been revoked */ 3105 tp1->sent = SCTP_DATAGRAM_SENT; 3106 tp1->rec.data.chunk_was_revoked = 1; 3107 /* 3108 * We must add this stuff back in to assure 3109 * timers and such get started. 3110 */ 3111 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3112 sctp_misc_ints(SCTP_FLIGHT_LOG_UP_REVOKE, 3113 tp1->whoTo->flight_size, 3114 tp1->book_size, 3115 (uintptr_t) tp1->whoTo, 3116 tp1->rec.data.TSN_seq); 3117 } 3118 sctp_flight_size_increase(tp1); 3119 sctp_total_flight_increase(stcb, tp1); 3120 /* 3121 * We inflate the cwnd to compensate for our 3122 * artificial inflation of the flight_size. 3123 */ 3124 tp1->whoTo->cwnd += tp1->book_size; 3125 tot_revoked++; 3126 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 3127 sctp_log_sack(asoc->last_acked_seq, 3128 cumack, 3129 tp1->rec.data.TSN_seq, 3130 0, 3131 0, 3132 SCTP_LOG_TSN_REVOKED); 3133 } 3134 } else if (tp1->sent == SCTP_DATAGRAM_MARKED) { 3135 /* it has been re-acked in this SACK */ 3136 tp1->sent = SCTP_DATAGRAM_ACKED; 3137 } 3138 } 3139 if (tp1->sent == SCTP_DATAGRAM_UNSENT) 3140 break; 3141 } 3142} 3143 3144 3145static void 3146sctp_strike_gap_ack_chunks(struct sctp_tcb *stcb, struct sctp_association *asoc, 3147 uint32_t biggest_tsn_acked, uint32_t biggest_tsn_newly_acked, uint32_t this_sack_lowest_newack, int accum_moved) 3148{ 3149 struct sctp_tmit_chunk *tp1; 3150 int strike_flag = 0; 3151 struct timeval now; 3152 int tot_retrans = 0; 3153 uint32_t sending_seq; 3154 struct sctp_nets *net; 3155 int num_dests_sacked = 0; 3156 3157 /* 3158 * select the sending_seq, this is either the next thing ready to be 3159 * sent but not transmitted, OR, the next seq we assign. 3160 */ 3161 tp1 = TAILQ_FIRST(&stcb->asoc.send_queue); 3162 if (tp1 == NULL) { 3163 sending_seq = asoc->sending_seq; 3164 } else { 3165 sending_seq = tp1->rec.data.TSN_seq; 3166 } 3167 3168 /* CMT DAC algo: finding out if SACK is a mixed SACK */ 3169 if ((asoc->sctp_cmt_on_off > 0) && 3170 SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) { 3171 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 3172 if (net->saw_newack) 3173 num_dests_sacked++; 3174 } 3175 } 3176 if (stcb->asoc.peer_supports_prsctp) { 3177 (void)SCTP_GETTIME_TIMEVAL(&now); 3178 } 3179 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 3180 strike_flag = 0; 3181 if (tp1->no_fr_allowed) { 3182 /* this one had a timeout or something */ 3183 continue; 3184 } 3185 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3186 if (tp1->sent < SCTP_DATAGRAM_RESEND) 3187 sctp_log_fr(biggest_tsn_newly_acked, 3188 tp1->rec.data.TSN_seq, 3189 tp1->sent, 3190 SCTP_FR_LOG_CHECK_STRIKE); 3191 } 3192 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, biggest_tsn_acked) || 3193 tp1->sent == SCTP_DATAGRAM_UNSENT) { 3194 /* done */ 3195 break; 3196 } 3197 if (stcb->asoc.peer_supports_prsctp) { 3198 if ((PR_SCTP_TTL_ENABLED(tp1->flags)) && tp1->sent < SCTP_DATAGRAM_ACKED) { 3199 /* Is it expired? */ 3200 if (timevalcmp(&now, &tp1->rec.data.timetodrop, >)) { 3201 /* Yes so drop it */ 3202 if (tp1->data != NULL) { 3203 (void)sctp_release_pr_sctp_chunk(stcb, tp1, 1, 3204 SCTP_SO_NOT_LOCKED); 3205 } 3206 continue; 3207 } 3208 } 3209 } 3210 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, asoc->this_sack_highest_gap)) { 3211 /* we are beyond the tsn in the sack */ 3212 break; 3213 } 3214 if (tp1->sent >= SCTP_DATAGRAM_RESEND) { 3215 /* either a RESEND, ACKED, or MARKED */ 3216 /* skip */ 3217 if (tp1->sent == SCTP_FORWARD_TSN_SKIP) { 3218 /* Continue strikin FWD-TSN chunks */ 3219 tp1->rec.data.fwd_tsn_cnt++; 3220 } 3221 continue; 3222 } 3223 /* 3224 * CMT : SFR algo (covers part of DAC and HTNA as well) 3225 */ 3226 if (tp1->whoTo && tp1->whoTo->saw_newack == 0) { 3227 /* 3228 * No new acks were receieved for data sent to this 3229 * dest. Therefore, according to the SFR algo for 3230 * CMT, no data sent to this dest can be marked for 3231 * FR using this SACK. 3232 */ 3233 continue; 3234 } else if (tp1->whoTo && SCTP_TSN_GT(tp1->rec.data.TSN_seq, 3235 tp1->whoTo->this_sack_highest_newack)) { 3236 /* 3237 * CMT: New acks were receieved for data sent to 3238 * this dest. But no new acks were seen for data 3239 * sent after tp1. Therefore, according to the SFR 3240 * algo for CMT, tp1 cannot be marked for FR using 3241 * this SACK. This step covers part of the DAC algo 3242 * and the HTNA algo as well. 3243 */ 3244 continue; 3245 } 3246 /* 3247 * Here we check to see if we were have already done a FR 3248 * and if so we see if the biggest TSN we saw in the sack is 3249 * smaller than the recovery point. If so we don't strike 3250 * the tsn... otherwise we CAN strike the TSN. 3251 */ 3252 /* 3253 * @@@ JRI: Check for CMT if (accum_moved && 3254 * asoc->fast_retran_loss_recovery && (sctp_cmt_on_off == 3255 * 0)) { 3256 */ 3257 if (accum_moved && asoc->fast_retran_loss_recovery) { 3258 /* 3259 * Strike the TSN if in fast-recovery and cum-ack 3260 * moved. 3261 */ 3262 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3263 sctp_log_fr(biggest_tsn_newly_acked, 3264 tp1->rec.data.TSN_seq, 3265 tp1->sent, 3266 SCTP_FR_LOG_STRIKE_CHUNK); 3267 } 3268 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3269 tp1->sent++; 3270 } 3271 if ((asoc->sctp_cmt_on_off > 0) && 3272 SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) { 3273 /* 3274 * CMT DAC algorithm: If SACK flag is set to 3275 * 0, then lowest_newack test will not pass 3276 * because it would have been set to the 3277 * cumack earlier. If not already to be 3278 * rtx'd, If not a mixed sack and if tp1 is 3279 * not between two sacked TSNs, then mark by 3280 * one more. NOTE that we are marking by one 3281 * additional time since the SACK DAC flag 3282 * indicates that two packets have been 3283 * received after this missing TSN. 3284 */ 3285 if ((tp1->sent < SCTP_DATAGRAM_RESEND) && (num_dests_sacked == 1) && 3286 SCTP_TSN_GT(this_sack_lowest_newack, tp1->rec.data.TSN_seq)) { 3287 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3288 sctp_log_fr(16 + num_dests_sacked, 3289 tp1->rec.data.TSN_seq, 3290 tp1->sent, 3291 SCTP_FR_LOG_STRIKE_CHUNK); 3292 } 3293 tp1->sent++; 3294 } 3295 } 3296 } else if ((tp1->rec.data.doing_fast_retransmit) && 3297 (asoc->sctp_cmt_on_off == 0)) { 3298 /* 3299 * For those that have done a FR we must take 3300 * special consideration if we strike. I.e the 3301 * biggest_newly_acked must be higher than the 3302 * sending_seq at the time we did the FR. 3303 */ 3304 if ( 3305#ifdef SCTP_FR_TO_ALTERNATE 3306 /* 3307 * If FR's go to new networks, then we must only do 3308 * this for singly homed asoc's. However if the FR's 3309 * go to the same network (Armando's work) then its 3310 * ok to FR multiple times. 3311 */ 3312 (asoc->numnets < 2) 3313#else 3314 (1) 3315#endif 3316 ) { 3317 3318 if (SCTP_TSN_GE(biggest_tsn_newly_acked, 3319 tp1->rec.data.fast_retran_tsn)) { 3320 /* 3321 * Strike the TSN, since this ack is 3322 * beyond where things were when we 3323 * did a FR. 3324 */ 3325 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3326 sctp_log_fr(biggest_tsn_newly_acked, 3327 tp1->rec.data.TSN_seq, 3328 tp1->sent, 3329 SCTP_FR_LOG_STRIKE_CHUNK); 3330 } 3331 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3332 tp1->sent++; 3333 } 3334 strike_flag = 1; 3335 if ((asoc->sctp_cmt_on_off > 0) && 3336 SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) { 3337 /* 3338 * CMT DAC algorithm: If 3339 * SACK flag is set to 0, 3340 * then lowest_newack test 3341 * will not pass because it 3342 * would have been set to 3343 * the cumack earlier. If 3344 * not already to be rtx'd, 3345 * If not a mixed sack and 3346 * if tp1 is not between two 3347 * sacked TSNs, then mark by 3348 * one more. NOTE that we 3349 * are marking by one 3350 * additional time since the 3351 * SACK DAC flag indicates 3352 * that two packets have 3353 * been received after this 3354 * missing TSN. 3355 */ 3356 if ((tp1->sent < SCTP_DATAGRAM_RESEND) && 3357 (num_dests_sacked == 1) && 3358 SCTP_TSN_GT(this_sack_lowest_newack, 3359 tp1->rec.data.TSN_seq)) { 3360 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3361 sctp_log_fr(32 + num_dests_sacked, 3362 tp1->rec.data.TSN_seq, 3363 tp1->sent, 3364 SCTP_FR_LOG_STRIKE_CHUNK); 3365 } 3366 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3367 tp1->sent++; 3368 } 3369 } 3370 } 3371 } 3372 } 3373 /* 3374 * JRI: TODO: remove code for HTNA algo. CMT's SFR 3375 * algo covers HTNA. 3376 */ 3377 } else if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, 3378 biggest_tsn_newly_acked)) { 3379 /* 3380 * We don't strike these: This is the HTNA 3381 * algorithm i.e. we don't strike If our TSN is 3382 * larger than the Highest TSN Newly Acked. 3383 */ 3384 ; 3385 } else { 3386 /* Strike the TSN */ 3387 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3388 sctp_log_fr(biggest_tsn_newly_acked, 3389 tp1->rec.data.TSN_seq, 3390 tp1->sent, 3391 SCTP_FR_LOG_STRIKE_CHUNK); 3392 } 3393 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3394 tp1->sent++; 3395 } 3396 if ((asoc->sctp_cmt_on_off > 0) && 3397 SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) { 3398 /* 3399 * CMT DAC algorithm: If SACK flag is set to 3400 * 0, then lowest_newack test will not pass 3401 * because it would have been set to the 3402 * cumack earlier. If not already to be 3403 * rtx'd, If not a mixed sack and if tp1 is 3404 * not between two sacked TSNs, then mark by 3405 * one more. NOTE that we are marking by one 3406 * additional time since the SACK DAC flag 3407 * indicates that two packets have been 3408 * received after this missing TSN. 3409 */ 3410 if ((tp1->sent < SCTP_DATAGRAM_RESEND) && (num_dests_sacked == 1) && 3411 SCTP_TSN_GT(this_sack_lowest_newack, tp1->rec.data.TSN_seq)) { 3412 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3413 sctp_log_fr(48 + num_dests_sacked, 3414 tp1->rec.data.TSN_seq, 3415 tp1->sent, 3416 SCTP_FR_LOG_STRIKE_CHUNK); 3417 } 3418 tp1->sent++; 3419 } 3420 } 3421 } 3422 if (tp1->sent == SCTP_DATAGRAM_RESEND) { 3423 struct sctp_nets *alt; 3424 3425 /* fix counts and things */ 3426 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3427 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_RSND, 3428 (tp1->whoTo ? (tp1->whoTo->flight_size) : 0), 3429 tp1->book_size, 3430 (uintptr_t) tp1->whoTo, 3431 tp1->rec.data.TSN_seq); 3432 } 3433 if (tp1->whoTo) { 3434 tp1->whoTo->net_ack++; 3435 sctp_flight_size_decrease(tp1); 3436 if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) { 3437 (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo, 3438 tp1); 3439 } 3440 } 3441 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) { 3442 sctp_log_rwnd(SCTP_INCREASE_PEER_RWND, 3443 asoc->peers_rwnd, tp1->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)); 3444 } 3445 /* add back to the rwnd */ 3446 asoc->peers_rwnd += (tp1->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)); 3447 3448 /* remove from the total flight */ 3449 sctp_total_flight_decrease(stcb, tp1); 3450 3451 if ((stcb->asoc.peer_supports_prsctp) && 3452 (PR_SCTP_RTX_ENABLED(tp1->flags))) { 3453 /* 3454 * Has it been retransmitted tv_sec times? - 3455 * we store the retran count there. 3456 */ 3457 if (tp1->snd_count > tp1->rec.data.timetodrop.tv_sec) { 3458 /* Yes, so drop it */ 3459 if (tp1->data != NULL) { 3460 (void)sctp_release_pr_sctp_chunk(stcb, tp1, 1, 3461 SCTP_SO_NOT_LOCKED); 3462 } 3463 /* Make sure to flag we had a FR */ 3464 tp1->whoTo->net_ack++; 3465 continue; 3466 } 3467 } 3468 /* 3469 * SCTP_PRINTF("OK, we are now ready to FR this 3470 * guy\n"); 3471 */ 3472 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 3473 sctp_log_fr(tp1->rec.data.TSN_seq, tp1->snd_count, 3474 0, SCTP_FR_MARKED); 3475 } 3476 if (strike_flag) { 3477 /* This is a subsequent FR */ 3478 SCTP_STAT_INCR(sctps_sendmultfastretrans); 3479 } 3480 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3481 if (asoc->sctp_cmt_on_off > 0) { 3482 /* 3483 * CMT: Using RTX_SSTHRESH policy for CMT. 3484 * If CMT is being used, then pick dest with 3485 * largest ssthresh for any retransmission. 3486 */ 3487 tp1->no_fr_allowed = 1; 3488 alt = tp1->whoTo; 3489 /* sa_ignore NO_NULL_CHK */ 3490 if (asoc->sctp_cmt_pf > 0) { 3491 /* 3492 * JRS 5/18/07 - If CMT PF is on, 3493 * use the PF version of 3494 * find_alt_net() 3495 */ 3496 alt = sctp_find_alternate_net(stcb, alt, 2); 3497 } else { 3498 /* 3499 * JRS 5/18/07 - If only CMT is on, 3500 * use the CMT version of 3501 * find_alt_net() 3502 */ 3503 /* sa_ignore NO_NULL_CHK */ 3504 alt = sctp_find_alternate_net(stcb, alt, 1); 3505 } 3506 if (alt == NULL) { 3507 alt = tp1->whoTo; 3508 } 3509 /* 3510 * CUCv2: If a different dest is picked for 3511 * the retransmission, then new 3512 * (rtx-)pseudo_cumack needs to be tracked 3513 * for orig dest. Let CUCv2 track new (rtx-) 3514 * pseudo-cumack always. 3515 */ 3516 if (tp1->whoTo) { 3517 tp1->whoTo->find_pseudo_cumack = 1; 3518 tp1->whoTo->find_rtx_pseudo_cumack = 1; 3519 } 3520 } else {/* CMT is OFF */ 3521 3522#ifdef SCTP_FR_TO_ALTERNATE 3523 /* Can we find an alternate? */ 3524 alt = sctp_find_alternate_net(stcb, tp1->whoTo, 0); 3525#else 3526 /* 3527 * default behavior is to NOT retransmit 3528 * FR's to an alternate. Armando Caro's 3529 * paper details why. 3530 */ 3531 alt = tp1->whoTo; 3532#endif 3533 } 3534 3535 tp1->rec.data.doing_fast_retransmit = 1; 3536 tot_retrans++; 3537 /* mark the sending seq for possible subsequent FR's */ 3538 /* 3539 * SCTP_PRINTF("Marking TSN for FR new value %x\n", 3540 * (uint32_t)tpi->rec.data.TSN_seq); 3541 */ 3542 if (TAILQ_EMPTY(&asoc->send_queue)) { 3543 /* 3544 * If the queue of send is empty then its 3545 * the next sequence number that will be 3546 * assigned so we subtract one from this to 3547 * get the one we last sent. 3548 */ 3549 tp1->rec.data.fast_retran_tsn = sending_seq; 3550 } else { 3551 /* 3552 * If there are chunks on the send queue 3553 * (unsent data that has made it from the 3554 * stream queues but not out the door, we 3555 * take the first one (which will have the 3556 * lowest TSN) and subtract one to get the 3557 * one we last sent. 3558 */ 3559 struct sctp_tmit_chunk *ttt; 3560 3561 ttt = TAILQ_FIRST(&asoc->send_queue); 3562 tp1->rec.data.fast_retran_tsn = 3563 ttt->rec.data.TSN_seq; 3564 } 3565 3566 if (tp1->do_rtt) { 3567 /* 3568 * this guy had a RTO calculation pending on 3569 * it, cancel it 3570 */ 3571 if ((tp1->whoTo != NULL) && 3572 (tp1->whoTo->rto_needed == 0)) { 3573 tp1->whoTo->rto_needed = 1; 3574 } 3575 tp1->do_rtt = 0; 3576 } 3577 if (alt != tp1->whoTo) { 3578 /* yes, there is an alternate. */ 3579 sctp_free_remote_addr(tp1->whoTo); 3580 /* sa_ignore FREED_MEMORY */ 3581 tp1->whoTo = alt; 3582 atomic_add_int(&alt->ref_count, 1); 3583 } 3584 } 3585 } 3586} 3587 3588struct sctp_tmit_chunk * 3589sctp_try_advance_peer_ack_point(struct sctp_tcb *stcb, 3590 struct sctp_association *asoc) 3591{ 3592 struct sctp_tmit_chunk *tp1, *tp2, *a_adv = NULL; 3593 struct timeval now; 3594 int now_filled = 0; 3595 3596 if (asoc->peer_supports_prsctp == 0) { 3597 return (NULL); 3598 } 3599 TAILQ_FOREACH_SAFE(tp1, &asoc->sent_queue, sctp_next, tp2) { 3600 if (tp1->sent != SCTP_FORWARD_TSN_SKIP && 3601 tp1->sent != SCTP_DATAGRAM_RESEND) { 3602 /* no chance to advance, out of here */ 3603 break; 3604 } 3605 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) { 3606 if (tp1->sent == SCTP_FORWARD_TSN_SKIP) { 3607 sctp_misc_ints(SCTP_FWD_TSN_CHECK, 3608 asoc->advanced_peer_ack_point, 3609 tp1->rec.data.TSN_seq, 0, 0); 3610 } 3611 } 3612 if (!PR_SCTP_ENABLED(tp1->flags)) { 3613 /* 3614 * We can't fwd-tsn past any that are reliable aka 3615 * retransmitted until the asoc fails. 3616 */ 3617 break; 3618 } 3619 if (!now_filled) { 3620 (void)SCTP_GETTIME_TIMEVAL(&now); 3621 now_filled = 1; 3622 } 3623 /* 3624 * now we got a chunk which is marked for another 3625 * retransmission to a PR-stream but has run out its chances 3626 * already maybe OR has been marked to skip now. Can we skip 3627 * it if its a resend? 3628 */ 3629 if (tp1->sent == SCTP_DATAGRAM_RESEND && 3630 (PR_SCTP_TTL_ENABLED(tp1->flags))) { 3631 /* 3632 * Now is this one marked for resend and its time is 3633 * now up? 3634 */ 3635 if (timevalcmp(&now, &tp1->rec.data.timetodrop, >)) { 3636 /* Yes so drop it */ 3637 if (tp1->data) { 3638 (void)sctp_release_pr_sctp_chunk(stcb, tp1, 3639 1, SCTP_SO_NOT_LOCKED); 3640 } 3641 } else { 3642 /* 3643 * No, we are done when hit one for resend 3644 * whos time as not expired. 3645 */ 3646 break; 3647 } 3648 } 3649 /* 3650 * Ok now if this chunk is marked to drop it we can clean up 3651 * the chunk, advance our peer ack point and we can check 3652 * the next chunk. 3653 */ 3654 if (tp1->sent == SCTP_FORWARD_TSN_SKIP) { 3655 /* advance PeerAckPoint goes forward */ 3656 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, asoc->advanced_peer_ack_point)) { 3657 asoc->advanced_peer_ack_point = tp1->rec.data.TSN_seq; 3658 a_adv = tp1; 3659 } else if (tp1->rec.data.TSN_seq == asoc->advanced_peer_ack_point) { 3660 /* No update but we do save the chk */ 3661 a_adv = tp1; 3662 } 3663 } else { 3664 /* 3665 * If it is still in RESEND we can advance no 3666 * further 3667 */ 3668 break; 3669 } 3670 } 3671 return (a_adv); 3672} 3673 3674static int 3675sctp_fs_audit(struct sctp_association *asoc) 3676{ 3677 struct sctp_tmit_chunk *chk; 3678 int inflight = 0, resend = 0, inbetween = 0, acked = 0, above = 0; 3679 int entry_flight, entry_cnt, ret; 3680 3681 entry_flight = asoc->total_flight; 3682 entry_cnt = asoc->total_flight_count; 3683 ret = 0; 3684 3685 if (asoc->pr_sctp_cnt >= asoc->sent_queue_cnt) 3686 return (0); 3687 3688 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) { 3689 if (chk->sent < SCTP_DATAGRAM_RESEND) { 3690 SCTP_PRINTF("Chk TSN:%u size:%d inflight cnt:%d\n", 3691 chk->rec.data.TSN_seq, 3692 chk->send_size, 3693 chk->snd_count); 3694 inflight++; 3695 } else if (chk->sent == SCTP_DATAGRAM_RESEND) { 3696 resend++; 3697 } else if (chk->sent < SCTP_DATAGRAM_ACKED) { 3698 inbetween++; 3699 } else if (chk->sent > SCTP_DATAGRAM_ACKED) { 3700 above++; 3701 } else { 3702 acked++; 3703 } 3704 } 3705 3706 if ((inflight > 0) || (inbetween > 0)) { 3707#ifdef INVARIANTS 3708 panic("Flight size-express incorrect? \n"); 3709#else 3710 SCTP_PRINTF("asoc->total_flight:%d cnt:%d\n", 3711 entry_flight, entry_cnt); 3712 3713 SCTP_PRINTF("Flight size-express incorrect F:%d I:%d R:%d Ab:%d ACK:%d\n", 3714 inflight, inbetween, resend, above, acked); 3715 ret = 1; 3716#endif 3717 } 3718 return (ret); 3719} 3720 3721 3722static void 3723sctp_window_probe_recovery(struct sctp_tcb *stcb, 3724 struct sctp_association *asoc, 3725 struct sctp_tmit_chunk *tp1) 3726{ 3727 tp1->window_probe = 0; 3728 if ((tp1->sent >= SCTP_DATAGRAM_ACKED) || (tp1->data == NULL)) { 3729 /* TSN's skipped we do NOT move back. */ 3730 sctp_misc_ints(SCTP_FLIGHT_LOG_DWN_WP_FWD, 3731 tp1->whoTo->flight_size, 3732 tp1->book_size, 3733 (uintptr_t) tp1->whoTo, 3734 tp1->rec.data.TSN_seq); 3735 return; 3736 } 3737 /* First setup this by shrinking flight */ 3738 if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) { 3739 (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo, 3740 tp1); 3741 } 3742 sctp_flight_size_decrease(tp1); 3743 sctp_total_flight_decrease(stcb, tp1); 3744 /* Now mark for resend */ 3745 tp1->sent = SCTP_DATAGRAM_RESEND; 3746 sctp_ucount_incr(asoc->sent_queue_retran_cnt); 3747 3748 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3749 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_WP, 3750 tp1->whoTo->flight_size, 3751 tp1->book_size, 3752 (uintptr_t) tp1->whoTo, 3753 tp1->rec.data.TSN_seq); 3754 } 3755} 3756 3757void 3758sctp_express_handle_sack(struct sctp_tcb *stcb, uint32_t cumack, 3759 uint32_t rwnd, int *abort_now, int ecne_seen) 3760{ 3761 struct sctp_nets *net; 3762 struct sctp_association *asoc; 3763 struct sctp_tmit_chunk *tp1, *tp2; 3764 uint32_t old_rwnd; 3765 int win_probe_recovery = 0; 3766 int win_probe_recovered = 0; 3767 int j, done_once = 0; 3768 int rto_ok = 1; 3769 3770 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_SACK_ARRIVALS_ENABLE) { 3771 sctp_misc_ints(SCTP_SACK_LOG_EXPRESS, cumack, 3772 rwnd, stcb->asoc.last_acked_seq, stcb->asoc.peers_rwnd); 3773 } 3774 SCTP_TCB_LOCK_ASSERT(stcb); 3775#ifdef SCTP_ASOCLOG_OF_TSNS 3776 stcb->asoc.cumack_log[stcb->asoc.cumack_log_at] = cumack; 3777 stcb->asoc.cumack_log_at++; 3778 if (stcb->asoc.cumack_log_at > SCTP_TSN_LOG_SIZE) { 3779 stcb->asoc.cumack_log_at = 0; 3780 } 3781#endif 3782 asoc = &stcb->asoc; 3783 old_rwnd = asoc->peers_rwnd; 3784 if (SCTP_TSN_GT(asoc->last_acked_seq, cumack)) { 3785 /* old ack */ 3786 return; 3787 } else if (asoc->last_acked_seq == cumack) { 3788 /* Window update sack */ 3789 asoc->peers_rwnd = sctp_sbspace_sub(rwnd, 3790 (uint32_t) (asoc->total_flight + (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)))); 3791 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 3792 /* SWS sender side engages */ 3793 asoc->peers_rwnd = 0; 3794 } 3795 if (asoc->peers_rwnd > old_rwnd) { 3796 goto again; 3797 } 3798 return; 3799 } 3800 /* First setup for CC stuff */ 3801 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 3802 if (SCTP_TSN_GT(cumack, net->cwr_window_tsn)) { 3803 /* Drag along the window_tsn for cwr's */ 3804 net->cwr_window_tsn = cumack; 3805 } 3806 net->prev_cwnd = net->cwnd; 3807 net->net_ack = 0; 3808 net->net_ack2 = 0; 3809 3810 /* 3811 * CMT: Reset CUC and Fast recovery algo variables before 3812 * SACK processing 3813 */ 3814 net->new_pseudo_cumack = 0; 3815 net->will_exit_fast_recovery = 0; 3816 if (stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack) { 3817 (*stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack) (stcb, net); 3818 } 3819 } 3820 if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) { 3821 uint32_t send_s; 3822 3823 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 3824 tp1 = TAILQ_LAST(&asoc->sent_queue, 3825 sctpchunk_listhead); 3826 send_s = tp1->rec.data.TSN_seq + 1; 3827 } else { 3828 send_s = asoc->sending_seq; 3829 } 3830 if (SCTP_TSN_GE(cumack, send_s)) { 3831#ifndef INVARIANTS 3832 struct mbuf *oper; 3833 3834#endif 3835#ifdef INVARIANTS 3836 panic("Impossible sack 1"); 3837#else 3838 3839 *abort_now = 1; 3840 /* XXX */ 3841 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)), 3842 0, M_DONTWAIT, 1, MT_DATA); 3843 if (oper) { 3844 struct sctp_paramhdr *ph; 3845 uint32_t *ippp; 3846 3847 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + 3848 sizeof(uint32_t); 3849 ph = mtod(oper, struct sctp_paramhdr *); 3850 ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 3851 ph->param_length = htons(SCTP_BUF_LEN(oper)); 3852 ippp = (uint32_t *) (ph + 1); 3853 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_25); 3854 } 3855 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_25; 3856 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED); 3857 return; 3858#endif 3859 } 3860 } 3861 asoc->this_sack_highest_gap = cumack; 3862 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 3863 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 3864 stcb->asoc.overall_error_count, 3865 0, 3866 SCTP_FROM_SCTP_INDATA, 3867 __LINE__); 3868 } 3869 stcb->asoc.overall_error_count = 0; 3870 if (SCTP_TSN_GT(cumack, asoc->last_acked_seq)) { 3871 /* process the new consecutive TSN first */ 3872 TAILQ_FOREACH_SAFE(tp1, &asoc->sent_queue, sctp_next, tp2) { 3873 if (SCTP_TSN_GE(cumack, tp1->rec.data.TSN_seq)) { 3874 if (tp1->sent == SCTP_DATAGRAM_UNSENT) { 3875 SCTP_PRINTF("Warning, an unsent is now acked?\n"); 3876 } 3877 if (tp1->sent < SCTP_DATAGRAM_ACKED) { 3878 /* 3879 * If it is less than ACKED, it is 3880 * now no-longer in flight. Higher 3881 * values may occur during marking 3882 */ 3883 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3884 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3885 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_CA, 3886 tp1->whoTo->flight_size, 3887 tp1->book_size, 3888 (uintptr_t) tp1->whoTo, 3889 tp1->rec.data.TSN_seq); 3890 } 3891 sctp_flight_size_decrease(tp1); 3892 if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) { 3893 (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo, 3894 tp1); 3895 } 3896 /* sa_ignore NO_NULL_CHK */ 3897 sctp_total_flight_decrease(stcb, tp1); 3898 } 3899 tp1->whoTo->net_ack += tp1->send_size; 3900 if (tp1->snd_count < 2) { 3901 /* 3902 * True non-retransmited 3903 * chunk 3904 */ 3905 tp1->whoTo->net_ack2 += 3906 tp1->send_size; 3907 3908 /* update RTO too? */ 3909 if (tp1->do_rtt) { 3910 if (rto_ok) { 3911 tp1->whoTo->RTO = 3912 /* 3913 * sa_ignore 3914 * NO_NULL_CH 3915 * K 3916 */ 3917 sctp_calculate_rto(stcb, 3918 asoc, tp1->whoTo, 3919 &tp1->sent_rcv_time, 3920 sctp_align_safe_nocopy, 3921 SCTP_RTT_FROM_DATA); 3922 rto_ok = 0; 3923 } 3924 if (tp1->whoTo->rto_needed == 0) { 3925 tp1->whoTo->rto_needed = 1; 3926 } 3927 tp1->do_rtt = 0; 3928 } 3929 } 3930 /* 3931 * CMT: CUCv2 algorithm. From the 3932 * cumack'd TSNs, for each TSN being 3933 * acked for the first time, set the 3934 * following variables for the 3935 * corresp destination. 3936 * new_pseudo_cumack will trigger a 3937 * cwnd update. 3938 * find_(rtx_)pseudo_cumack will 3939 * trigger search for the next 3940 * expected (rtx-)pseudo-cumack. 3941 */ 3942 tp1->whoTo->new_pseudo_cumack = 1; 3943 tp1->whoTo->find_pseudo_cumack = 1; 3944 tp1->whoTo->find_rtx_pseudo_cumack = 1; 3945 3946 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 3947 /* sa_ignore NO_NULL_CHK */ 3948 sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK); 3949 } 3950 } 3951 if (tp1->sent == SCTP_DATAGRAM_RESEND) { 3952 sctp_ucount_decr(asoc->sent_queue_retran_cnt); 3953 } 3954 if (tp1->rec.data.chunk_was_revoked) { 3955 /* deflate the cwnd */ 3956 tp1->whoTo->cwnd -= tp1->book_size; 3957 tp1->rec.data.chunk_was_revoked = 0; 3958 } 3959 tp1->sent = SCTP_DATAGRAM_ACKED; 3960 TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next); 3961 if (tp1->data) { 3962 /* sa_ignore NO_NULL_CHK */ 3963 sctp_free_bufspace(stcb, asoc, tp1, 1); 3964 sctp_m_freem(tp1->data); 3965 tp1->data = NULL; 3966 } 3967 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 3968 sctp_log_sack(asoc->last_acked_seq, 3969 cumack, 3970 tp1->rec.data.TSN_seq, 3971 0, 3972 0, 3973 SCTP_LOG_FREE_SENT); 3974 } 3975 asoc->sent_queue_cnt--; 3976 sctp_free_a_chunk(stcb, tp1, SCTP_SO_NOT_LOCKED); 3977 } else { 3978 break; 3979 } 3980 } 3981 3982 } 3983 /* sa_ignore NO_NULL_CHK */ 3984 if (stcb->sctp_socket) { 3985#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3986 struct socket *so; 3987 3988#endif 3989 SOCKBUF_LOCK(&stcb->sctp_socket->so_snd); 3990 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) { 3991 /* sa_ignore NO_NULL_CHK */ 3992 sctp_wakeup_log(stcb, 1, SCTP_WAKESND_FROM_SACK); 3993 } 3994#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3995 so = SCTP_INP_SO(stcb->sctp_ep); 3996 atomic_add_int(&stcb->asoc.refcnt, 1); 3997 SCTP_TCB_UNLOCK(stcb); 3998 SCTP_SOCKET_LOCK(so, 1); 3999 SCTP_TCB_LOCK(stcb); 4000 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4001 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 4002 /* assoc was freed while we were unlocked */ 4003 SCTP_SOCKET_UNLOCK(so, 1); 4004 return; 4005 } 4006#endif 4007 sctp_sowwakeup_locked(stcb->sctp_ep, stcb->sctp_socket); 4008#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4009 SCTP_SOCKET_UNLOCK(so, 1); 4010#endif 4011 } else { 4012 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) { 4013 sctp_wakeup_log(stcb, 1, SCTP_NOWAKE_FROM_SACK); 4014 } 4015 } 4016 4017 /* JRS - Use the congestion control given in the CC module */ 4018 if ((asoc->last_acked_seq != cumack) && (ecne_seen == 0)) { 4019 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4020 if (net->net_ack2 > 0) { 4021 /* 4022 * Karn's rule applies to clearing error 4023 * count, this is optional. 4024 */ 4025 net->error_count = 0; 4026 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) { 4027 /* addr came good */ 4028 net->dest_state |= SCTP_ADDR_REACHABLE; 4029 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 4030 0, (void *)net, SCTP_SO_NOT_LOCKED); 4031 } 4032 if (net == stcb->asoc.primary_destination) { 4033 if (stcb->asoc.alternate) { 4034 /* 4035 * release the alternate, 4036 * primary is good 4037 */ 4038 sctp_free_remote_addr(stcb->asoc.alternate); 4039 stcb->asoc.alternate = NULL; 4040 } 4041 } 4042 if (net->dest_state & SCTP_ADDR_PF) { 4043 net->dest_state &= ~SCTP_ADDR_PF; 4044 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 4045 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 4046 asoc->cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 4047 /* Done with this net */ 4048 net->net_ack = 0; 4049 } 4050 /* restore any doubled timers */ 4051 net->RTO = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv; 4052 if (net->RTO < stcb->asoc.minrto) { 4053 net->RTO = stcb->asoc.minrto; 4054 } 4055 if (net->RTO > stcb->asoc.maxrto) { 4056 net->RTO = stcb->asoc.maxrto; 4057 } 4058 } 4059 } 4060 asoc->cc_functions.sctp_cwnd_update_after_sack(stcb, asoc, 1, 0, 0); 4061 } 4062 asoc->last_acked_seq = cumack; 4063 4064 if (TAILQ_EMPTY(&asoc->sent_queue)) { 4065 /* nothing left in-flight */ 4066 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4067 net->flight_size = 0; 4068 net->partial_bytes_acked = 0; 4069 } 4070 asoc->total_flight = 0; 4071 asoc->total_flight_count = 0; 4072 } 4073 /* RWND update */ 4074 asoc->peers_rwnd = sctp_sbspace_sub(rwnd, 4075 (uint32_t) (asoc->total_flight + (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)))); 4076 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4077 /* SWS sender side engages */ 4078 asoc->peers_rwnd = 0; 4079 } 4080 if (asoc->peers_rwnd > old_rwnd) { 4081 win_probe_recovery = 1; 4082 } 4083 /* Now assure a timer where data is queued at */ 4084again: 4085 j = 0; 4086 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4087 int to_ticks; 4088 4089 if (win_probe_recovery && (net->window_probe)) { 4090 win_probe_recovered = 1; 4091 /* 4092 * Find first chunk that was used with window probe 4093 * and clear the sent 4094 */ 4095 /* sa_ignore FREED_MEMORY */ 4096 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 4097 if (tp1->window_probe) { 4098 /* move back to data send queue */ 4099 sctp_window_probe_recovery(stcb, asoc, tp1); 4100 break; 4101 } 4102 } 4103 } 4104 if (net->RTO == 0) { 4105 to_ticks = MSEC_TO_TICKS(stcb->asoc.initial_rto); 4106 } else { 4107 to_ticks = MSEC_TO_TICKS(net->RTO); 4108 } 4109 if (net->flight_size) { 4110 j++; 4111 (void)SCTP_OS_TIMER_START(&net->rxt_timer.timer, to_ticks, 4112 sctp_timeout_handler, &net->rxt_timer); 4113 if (net->window_probe) { 4114 net->window_probe = 0; 4115 } 4116 } else { 4117 if (net->window_probe) { 4118 /* 4119 * In window probes we must assure a timer 4120 * is still running there 4121 */ 4122 net->window_probe = 0; 4123 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { 4124 SCTP_OS_TIMER_START(&net->rxt_timer.timer, to_ticks, 4125 sctp_timeout_handler, &net->rxt_timer); 4126 } 4127 } else if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { 4128 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 4129 stcb, net, 4130 SCTP_FROM_SCTP_INDATA + SCTP_LOC_22); 4131 } 4132 } 4133 } 4134 if ((j == 0) && 4135 (!TAILQ_EMPTY(&asoc->sent_queue)) && 4136 (asoc->sent_queue_retran_cnt == 0) && 4137 (win_probe_recovered == 0) && 4138 (done_once == 0)) { 4139 /* 4140 * huh, this should not happen unless all packets are 4141 * PR-SCTP and marked to skip of course. 4142 */ 4143 if (sctp_fs_audit(asoc)) { 4144 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4145 net->flight_size = 0; 4146 } 4147 asoc->total_flight = 0; 4148 asoc->total_flight_count = 0; 4149 asoc->sent_queue_retran_cnt = 0; 4150 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 4151 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 4152 sctp_flight_size_increase(tp1); 4153 sctp_total_flight_increase(stcb, tp1); 4154 } else if (tp1->sent == SCTP_DATAGRAM_RESEND) { 4155 sctp_ucount_incr(asoc->sent_queue_retran_cnt); 4156 } 4157 } 4158 } 4159 done_once = 1; 4160 goto again; 4161 } 4162 /**********************************/ 4163 /* Now what about shutdown issues */ 4164 /**********************************/ 4165 if (TAILQ_EMPTY(&asoc->send_queue) && TAILQ_EMPTY(&asoc->sent_queue)) { 4166 /* nothing left on sendqueue.. consider done */ 4167 /* clean up */ 4168 if ((asoc->stream_queue_cnt == 1) && 4169 ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) || 4170 (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED)) && 4171 (asoc->locked_on_sending) 4172 ) { 4173 struct sctp_stream_queue_pending *sp; 4174 4175 /* 4176 * I may be in a state where we got all across.. but 4177 * cannot write more due to a shutdown... we abort 4178 * since the user did not indicate EOR in this case. 4179 * The sp will be cleaned during free of the asoc. 4180 */ 4181 sp = TAILQ_LAST(&((asoc->locked_on_sending)->outqueue), 4182 sctp_streamhead); 4183 if ((sp) && (sp->length == 0)) { 4184 /* Let cleanup code purge it */ 4185 if (sp->msg_is_complete) { 4186 asoc->stream_queue_cnt--; 4187 } else { 4188 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT; 4189 asoc->locked_on_sending = NULL; 4190 asoc->stream_queue_cnt--; 4191 } 4192 } 4193 } 4194 if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) && 4195 (asoc->stream_queue_cnt == 0)) { 4196 if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) { 4197 /* Need to abort here */ 4198 struct mbuf *oper; 4199 4200 abort_out_now: 4201 *abort_now = 1; 4202 /* XXX */ 4203 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)), 4204 0, M_DONTWAIT, 1, MT_DATA); 4205 if (oper) { 4206 struct sctp_paramhdr *ph; 4207 uint32_t *ippp; 4208 4209 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + 4210 sizeof(uint32_t); 4211 ph = mtod(oper, struct sctp_paramhdr *); 4212 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT); 4213 ph->param_length = htons(SCTP_BUF_LEN(oper)); 4214 ippp = (uint32_t *) (ph + 1); 4215 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_24); 4216 } 4217 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_24; 4218 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED); 4219 } else { 4220 struct sctp_nets *netp; 4221 4222 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 4223 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 4224 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 4225 } 4226 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT); 4227 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 4228 sctp_stop_timers_for_shutdown(stcb); 4229 if (asoc->alternate) { 4230 netp = asoc->alternate; 4231 } else { 4232 netp = asoc->primary_destination; 4233 } 4234 sctp_send_shutdown(stcb, netp); 4235 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, 4236 stcb->sctp_ep, stcb, netp); 4237 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 4238 stcb->sctp_ep, stcb, netp); 4239 } 4240 } else if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) && 4241 (asoc->stream_queue_cnt == 0)) { 4242 struct sctp_nets *netp; 4243 4244 if (asoc->alternate) { 4245 netp = asoc->alternate; 4246 } else { 4247 netp = asoc->primary_destination; 4248 } 4249 if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) { 4250 goto abort_out_now; 4251 } 4252 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 4253 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 4254 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 4255 sctp_send_shutdown_ack(stcb, netp); 4256 sctp_stop_timers_for_shutdown(stcb); 4257 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, 4258 stcb->sctp_ep, stcb, netp); 4259 } 4260 } 4261 /*********************************************/ 4262 /* Here we perform PR-SCTP procedures */ 4263 /* (section 4.2) */ 4264 /*********************************************/ 4265 /* C1. update advancedPeerAckPoint */ 4266 if (SCTP_TSN_GT(cumack, asoc->advanced_peer_ack_point)) { 4267 asoc->advanced_peer_ack_point = cumack; 4268 } 4269 /* PR-Sctp issues need to be addressed too */ 4270 if ((asoc->peer_supports_prsctp) && (asoc->pr_sctp_cnt > 0)) { 4271 struct sctp_tmit_chunk *lchk; 4272 uint32_t old_adv_peer_ack_point; 4273 4274 old_adv_peer_ack_point = asoc->advanced_peer_ack_point; 4275 lchk = sctp_try_advance_peer_ack_point(stcb, asoc); 4276 /* C3. See if we need to send a Fwd-TSN */ 4277 if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, cumack)) { 4278 /* 4279 * ISSUE with ECN, see FWD-TSN processing. 4280 */ 4281 if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, old_adv_peer_ack_point)) { 4282 send_forward_tsn(stcb, asoc); 4283 } else if (lchk) { 4284 /* try to FR fwd-tsn's that get lost too */ 4285 if (lchk->rec.data.fwd_tsn_cnt >= 3) { 4286 send_forward_tsn(stcb, asoc); 4287 } 4288 } 4289 } 4290 if (lchk) { 4291 /* Assure a timer is up */ 4292 sctp_timer_start(SCTP_TIMER_TYPE_SEND, 4293 stcb->sctp_ep, stcb, lchk->whoTo); 4294 } 4295 } 4296 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_RWND_LOGGING_ENABLE) { 4297 sctp_misc_ints(SCTP_SACK_RWND_UPDATE, 4298 rwnd, 4299 stcb->asoc.peers_rwnd, 4300 stcb->asoc.total_flight, 4301 stcb->asoc.total_output_queue_size); 4302 } 4303} 4304 4305void 4306sctp_handle_sack(struct mbuf *m, int offset_seg, int offset_dup, 4307 struct sctp_tcb *stcb, 4308 uint16_t num_seg, uint16_t num_nr_seg, uint16_t num_dup, 4309 int *abort_now, uint8_t flags, 4310 uint32_t cum_ack, uint32_t rwnd, int ecne_seen) 4311{ 4312 struct sctp_association *asoc; 4313 struct sctp_tmit_chunk *tp1, *tp2; 4314 uint32_t last_tsn, biggest_tsn_acked, biggest_tsn_newly_acked, this_sack_lowest_newack; 4315 uint16_t wake_him = 0; 4316 uint32_t send_s = 0; 4317 long j; 4318 int accum_moved = 0; 4319 int will_exit_fast_recovery = 0; 4320 uint32_t a_rwnd, old_rwnd; 4321 int win_probe_recovery = 0; 4322 int win_probe_recovered = 0; 4323 struct sctp_nets *net = NULL; 4324 int done_once; 4325 int rto_ok = 1; 4326 uint8_t reneged_all = 0; 4327 uint8_t cmt_dac_flag; 4328 4329 /* 4330 * we take any chance we can to service our queues since we cannot 4331 * get awoken when the socket is read from :< 4332 */ 4333 /* 4334 * Now perform the actual SACK handling: 1) Verify that it is not an 4335 * old sack, if so discard. 2) If there is nothing left in the send 4336 * queue (cum-ack is equal to last acked) then you have a duplicate 4337 * too, update any rwnd change and verify no timers are running. 4338 * then return. 3) Process any new consequtive data i.e. cum-ack 4339 * moved process these first and note that it moved. 4) Process any 4340 * sack blocks. 5) Drop any acked from the queue. 6) Check for any 4341 * revoked blocks and mark. 7) Update the cwnd. 8) Nothing left, 4342 * sync up flightsizes and things, stop all timers and also check 4343 * for shutdown_pending state. If so then go ahead and send off the 4344 * shutdown. If in shutdown recv, send off the shutdown-ack and 4345 * start that timer, Ret. 9) Strike any non-acked things and do FR 4346 * procedure if needed being sure to set the FR flag. 10) Do pr-sctp 4347 * procedures. 11) Apply any FR penalties. 12) Assure we will SACK 4348 * if in shutdown_recv state. 4349 */ 4350 SCTP_TCB_LOCK_ASSERT(stcb); 4351 /* CMT DAC algo */ 4352 this_sack_lowest_newack = 0; 4353 SCTP_STAT_INCR(sctps_slowpath_sack); 4354 last_tsn = cum_ack; 4355 cmt_dac_flag = flags & SCTP_SACK_CMT_DAC; 4356#ifdef SCTP_ASOCLOG_OF_TSNS 4357 stcb->asoc.cumack_log[stcb->asoc.cumack_log_at] = cum_ack; 4358 stcb->asoc.cumack_log_at++; 4359 if (stcb->asoc.cumack_log_at > SCTP_TSN_LOG_SIZE) { 4360 stcb->asoc.cumack_log_at = 0; 4361 } 4362#endif 4363 a_rwnd = rwnd; 4364 4365 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_SACK_ARRIVALS_ENABLE) { 4366 sctp_misc_ints(SCTP_SACK_LOG_NORMAL, cum_ack, 4367 rwnd, stcb->asoc.last_acked_seq, stcb->asoc.peers_rwnd); 4368 } 4369 old_rwnd = stcb->asoc.peers_rwnd; 4370 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4371 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4372 stcb->asoc.overall_error_count, 4373 0, 4374 SCTP_FROM_SCTP_INDATA, 4375 __LINE__); 4376 } 4377 stcb->asoc.overall_error_count = 0; 4378 asoc = &stcb->asoc; 4379 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 4380 sctp_log_sack(asoc->last_acked_seq, 4381 cum_ack, 4382 0, 4383 num_seg, 4384 num_dup, 4385 SCTP_LOG_NEW_SACK); 4386 } 4387 if ((num_dup) && (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE)) { 4388 uint16_t i; 4389 uint32_t *dupdata, dblock; 4390 4391 for (i = 0; i < num_dup; i++) { 4392 dupdata = (uint32_t *) sctp_m_getptr(m, offset_dup + i * sizeof(uint32_t), 4393 sizeof(uint32_t), (uint8_t *) & dblock); 4394 if (dupdata == NULL) { 4395 break; 4396 } 4397 sctp_log_fr(*dupdata, 0, 0, SCTP_FR_DUPED); 4398 } 4399 } 4400 if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) { 4401 /* reality check */ 4402 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 4403 tp1 = TAILQ_LAST(&asoc->sent_queue, 4404 sctpchunk_listhead); 4405 send_s = tp1->rec.data.TSN_seq + 1; 4406 } else { 4407 tp1 = NULL; 4408 send_s = asoc->sending_seq; 4409 } 4410 if (SCTP_TSN_GE(cum_ack, send_s)) { 4411 struct mbuf *oper; 4412 4413 /* 4414 * no way, we have not even sent this TSN out yet. 4415 * Peer is hopelessly messed up with us. 4416 */ 4417 SCTP_PRINTF("NEW cum_ack:%x send_s:%x is smaller or equal\n", 4418 cum_ack, send_s); 4419 if (tp1) { 4420 SCTP_PRINTF("Got send_s from tsn:%x + 1 of tp1:%p\n", 4421 tp1->rec.data.TSN_seq, tp1); 4422 } 4423 hopeless_peer: 4424 *abort_now = 1; 4425 /* XXX */ 4426 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)), 4427 0, M_DONTWAIT, 1, MT_DATA); 4428 if (oper) { 4429 struct sctp_paramhdr *ph; 4430 uint32_t *ippp; 4431 4432 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + 4433 sizeof(uint32_t); 4434 ph = mtod(oper, struct sctp_paramhdr *); 4435 ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 4436 ph->param_length = htons(SCTP_BUF_LEN(oper)); 4437 ippp = (uint32_t *) (ph + 1); 4438 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_25); 4439 } 4440 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_25; 4441 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED); 4442 return; 4443 } 4444 } 4445 /**********************/ 4446 /* 1) check the range */ 4447 /**********************/ 4448 if (SCTP_TSN_GT(asoc->last_acked_seq, last_tsn)) { 4449 /* acking something behind */ 4450 return; 4451 } 4452 /* update the Rwnd of the peer */ 4453 if (TAILQ_EMPTY(&asoc->sent_queue) && 4454 TAILQ_EMPTY(&asoc->send_queue) && 4455 (asoc->stream_queue_cnt == 0)) { 4456 /* nothing left on send/sent and strmq */ 4457 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) { 4458 sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK, 4459 asoc->peers_rwnd, 0, 0, a_rwnd); 4460 } 4461 asoc->peers_rwnd = a_rwnd; 4462 if (asoc->sent_queue_retran_cnt) { 4463 asoc->sent_queue_retran_cnt = 0; 4464 } 4465 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4466 /* SWS sender side engages */ 4467 asoc->peers_rwnd = 0; 4468 } 4469 /* stop any timers */ 4470 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4471 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 4472 stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_26); 4473 net->partial_bytes_acked = 0; 4474 net->flight_size = 0; 4475 } 4476 asoc->total_flight = 0; 4477 asoc->total_flight_count = 0; 4478 return; 4479 } 4480 /* 4481 * We init netAckSz and netAckSz2 to 0. These are used to track 2 4482 * things. The total byte count acked is tracked in netAckSz AND 4483 * netAck2 is used to track the total bytes acked that are un- 4484 * amibguious and were never retransmitted. We track these on a per 4485 * destination address basis. 4486 */ 4487 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4488 if (SCTP_TSN_GT(cum_ack, net->cwr_window_tsn)) { 4489 /* Drag along the window_tsn for cwr's */ 4490 net->cwr_window_tsn = cum_ack; 4491 } 4492 net->prev_cwnd = net->cwnd; 4493 net->net_ack = 0; 4494 net->net_ack2 = 0; 4495 4496 /* 4497 * CMT: Reset CUC and Fast recovery algo variables before 4498 * SACK processing 4499 */ 4500 net->new_pseudo_cumack = 0; 4501 net->will_exit_fast_recovery = 0; 4502 if (stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack) { 4503 (*stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack) (stcb, net); 4504 } 4505 } 4506 /* process the new consecutive TSN first */ 4507 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 4508 if (SCTP_TSN_GE(last_tsn, tp1->rec.data.TSN_seq)) { 4509 if (tp1->sent != SCTP_DATAGRAM_UNSENT) { 4510 accum_moved = 1; 4511 if (tp1->sent < SCTP_DATAGRAM_ACKED) { 4512 /* 4513 * If it is less than ACKED, it is 4514 * now no-longer in flight. Higher 4515 * values may occur during marking 4516 */ 4517 if ((tp1->whoTo->dest_state & 4518 SCTP_ADDR_UNCONFIRMED) && 4519 (tp1->snd_count < 2)) { 4520 /* 4521 * If there was no retran 4522 * and the address is 4523 * un-confirmed and we sent 4524 * there and are now 4525 * sacked.. its confirmed, 4526 * mark it so. 4527 */ 4528 tp1->whoTo->dest_state &= 4529 ~SCTP_ADDR_UNCONFIRMED; 4530 } 4531 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 4532 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 4533 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_CA, 4534 tp1->whoTo->flight_size, 4535 tp1->book_size, 4536 (uintptr_t) tp1->whoTo, 4537 tp1->rec.data.TSN_seq); 4538 } 4539 sctp_flight_size_decrease(tp1); 4540 sctp_total_flight_decrease(stcb, tp1); 4541 if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) { 4542 (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo, 4543 tp1); 4544 } 4545 } 4546 tp1->whoTo->net_ack += tp1->send_size; 4547 4548 /* CMT SFR and DAC algos */ 4549 this_sack_lowest_newack = tp1->rec.data.TSN_seq; 4550 tp1->whoTo->saw_newack = 1; 4551 4552 if (tp1->snd_count < 2) { 4553 /* 4554 * True non-retransmited 4555 * chunk 4556 */ 4557 tp1->whoTo->net_ack2 += 4558 tp1->send_size; 4559 4560 /* update RTO too? */ 4561 if (tp1->do_rtt) { 4562 if (rto_ok) { 4563 tp1->whoTo->RTO = 4564 sctp_calculate_rto(stcb, 4565 asoc, tp1->whoTo, 4566 &tp1->sent_rcv_time, 4567 sctp_align_safe_nocopy, 4568 SCTP_RTT_FROM_DATA); 4569 rto_ok = 0; 4570 } 4571 if (tp1->whoTo->rto_needed == 0) { 4572 tp1->whoTo->rto_needed = 1; 4573 } 4574 tp1->do_rtt = 0; 4575 } 4576 } 4577 /* 4578 * CMT: CUCv2 algorithm. From the 4579 * cumack'd TSNs, for each TSN being 4580 * acked for the first time, set the 4581 * following variables for the 4582 * corresp destination. 4583 * new_pseudo_cumack will trigger a 4584 * cwnd update. 4585 * find_(rtx_)pseudo_cumack will 4586 * trigger search for the next 4587 * expected (rtx-)pseudo-cumack. 4588 */ 4589 tp1->whoTo->new_pseudo_cumack = 1; 4590 tp1->whoTo->find_pseudo_cumack = 1; 4591 tp1->whoTo->find_rtx_pseudo_cumack = 1; 4592 4593 4594 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 4595 sctp_log_sack(asoc->last_acked_seq, 4596 cum_ack, 4597 tp1->rec.data.TSN_seq, 4598 0, 4599 0, 4600 SCTP_LOG_TSN_ACKED); 4601 } 4602 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 4603 sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK); 4604 } 4605 } 4606 if (tp1->sent == SCTP_DATAGRAM_RESEND) { 4607 sctp_ucount_decr(asoc->sent_queue_retran_cnt); 4608#ifdef SCTP_AUDITING_ENABLED 4609 sctp_audit_log(0xB3, 4610 (asoc->sent_queue_retran_cnt & 0x000000ff)); 4611#endif 4612 } 4613 if (tp1->rec.data.chunk_was_revoked) { 4614 /* deflate the cwnd */ 4615 tp1->whoTo->cwnd -= tp1->book_size; 4616 tp1->rec.data.chunk_was_revoked = 0; 4617 } 4618 tp1->sent = SCTP_DATAGRAM_ACKED; 4619 } 4620 } else { 4621 break; 4622 } 4623 } 4624 biggest_tsn_newly_acked = biggest_tsn_acked = last_tsn; 4625 /* always set this up to cum-ack */ 4626 asoc->this_sack_highest_gap = last_tsn; 4627 4628 if ((num_seg > 0) || (num_nr_seg > 0)) { 4629 4630 /* 4631 * CMT: SFR algo (and HTNA) - this_sack_highest_newack has 4632 * to be greater than the cumack. Also reset saw_newack to 0 4633 * for all dests. 4634 */ 4635 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4636 net->saw_newack = 0; 4637 net->this_sack_highest_newack = last_tsn; 4638 } 4639 4640 /* 4641 * thisSackHighestGap will increase while handling NEW 4642 * segments this_sack_highest_newack will increase while 4643 * handling NEWLY ACKED chunks. this_sack_lowest_newack is 4644 * used for CMT DAC algo. saw_newack will also change. 4645 */ 4646 if (sctp_handle_segments(m, &offset_seg, stcb, asoc, last_tsn, &biggest_tsn_acked, 4647 &biggest_tsn_newly_acked, &this_sack_lowest_newack, 4648 num_seg, num_nr_seg, &rto_ok)) { 4649 wake_him++; 4650 } 4651 if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) { 4652 /* 4653 * validate the biggest_tsn_acked in the gap acks if 4654 * strict adherence is wanted. 4655 */ 4656 if (SCTP_TSN_GE(biggest_tsn_acked, send_s)) { 4657 /* 4658 * peer is either confused or we are under 4659 * attack. We must abort. 4660 */ 4661 SCTP_PRINTF("Hopeless peer! biggest_tsn_acked:%x largest seq:%x\n", 4662 biggest_tsn_acked, send_s); 4663 goto hopeless_peer; 4664 } 4665 } 4666 } 4667 /*******************************************/ 4668 /* cancel ALL T3-send timer if accum moved */ 4669 /*******************************************/ 4670 if (asoc->sctp_cmt_on_off > 0) { 4671 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4672 if (net->new_pseudo_cumack) 4673 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 4674 stcb, net, 4675 SCTP_FROM_SCTP_INDATA + SCTP_LOC_27); 4676 4677 } 4678 } else { 4679 if (accum_moved) { 4680 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4681 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 4682 stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_28); 4683 } 4684 } 4685 } 4686 /********************************************/ 4687 /* drop the acked chunks from the sentqueue */ 4688 /********************************************/ 4689 asoc->last_acked_seq = cum_ack; 4690 4691 TAILQ_FOREACH_SAFE(tp1, &asoc->sent_queue, sctp_next, tp2) { 4692 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, cum_ack)) { 4693 break; 4694 } 4695 if (tp1->sent == SCTP_DATAGRAM_UNSENT) { 4696 /* no more sent on list */ 4697 SCTP_PRINTF("Warning, tp1->sent == %d and its now acked?\n", 4698 tp1->sent); 4699 } 4700 TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next); 4701 if (tp1->pr_sctp_on) { 4702 if (asoc->pr_sctp_cnt != 0) 4703 asoc->pr_sctp_cnt--; 4704 } 4705 asoc->sent_queue_cnt--; 4706 if (tp1->data) { 4707 /* sa_ignore NO_NULL_CHK */ 4708 sctp_free_bufspace(stcb, asoc, tp1, 1); 4709 sctp_m_freem(tp1->data); 4710 tp1->data = NULL; 4711 if (asoc->peer_supports_prsctp && PR_SCTP_BUF_ENABLED(tp1->flags)) { 4712 asoc->sent_queue_cnt_removeable--; 4713 } 4714 } 4715 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { 4716 sctp_log_sack(asoc->last_acked_seq, 4717 cum_ack, 4718 tp1->rec.data.TSN_seq, 4719 0, 4720 0, 4721 SCTP_LOG_FREE_SENT); 4722 } 4723 sctp_free_a_chunk(stcb, tp1, SCTP_SO_NOT_LOCKED); 4724 wake_him++; 4725 } 4726 if (TAILQ_EMPTY(&asoc->sent_queue) && (asoc->total_flight > 0)) { 4727#ifdef INVARIANTS 4728 panic("Warning flight size is postive and should be 0"); 4729#else 4730 SCTP_PRINTF("Warning flight size incorrect should be 0 is %d\n", 4731 asoc->total_flight); 4732#endif 4733 asoc->total_flight = 0; 4734 } 4735 /* sa_ignore NO_NULL_CHK */ 4736 if ((wake_him) && (stcb->sctp_socket)) { 4737#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4738 struct socket *so; 4739 4740#endif 4741 SOCKBUF_LOCK(&stcb->sctp_socket->so_snd); 4742 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) { 4743 sctp_wakeup_log(stcb, wake_him, SCTP_WAKESND_FROM_SACK); 4744 } 4745#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4746 so = SCTP_INP_SO(stcb->sctp_ep); 4747 atomic_add_int(&stcb->asoc.refcnt, 1); 4748 SCTP_TCB_UNLOCK(stcb); 4749 SCTP_SOCKET_LOCK(so, 1); 4750 SCTP_TCB_LOCK(stcb); 4751 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4752 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 4753 /* assoc was freed while we were unlocked */ 4754 SCTP_SOCKET_UNLOCK(so, 1); 4755 return; 4756 } 4757#endif 4758 sctp_sowwakeup_locked(stcb->sctp_ep, stcb->sctp_socket); 4759#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4760 SCTP_SOCKET_UNLOCK(so, 1); 4761#endif 4762 } else { 4763 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) { 4764 sctp_wakeup_log(stcb, wake_him, SCTP_NOWAKE_FROM_SACK); 4765 } 4766 } 4767 4768 if (asoc->fast_retran_loss_recovery && accum_moved) { 4769 if (SCTP_TSN_GE(asoc->last_acked_seq, asoc->fast_recovery_tsn)) { 4770 /* Setup so we will exit RFC2582 fast recovery */ 4771 will_exit_fast_recovery = 1; 4772 } 4773 } 4774 /* 4775 * Check for revoked fragments: 4776 * 4777 * if Previous sack - Had no frags then we can't have any revoked if 4778 * Previous sack - Had frag's then - If we now have frags aka 4779 * num_seg > 0 call sctp_check_for_revoked() to tell if peer revoked 4780 * some of them. else - The peer revoked all ACKED fragments, since 4781 * we had some before and now we have NONE. 4782 */ 4783 4784 if (num_seg) { 4785 sctp_check_for_revoked(stcb, asoc, cum_ack, biggest_tsn_acked); 4786 asoc->saw_sack_with_frags = 1; 4787 } else if (asoc->saw_sack_with_frags) { 4788 int cnt_revoked = 0; 4789 4790 /* Peer revoked all dg's marked or acked */ 4791 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 4792 if (tp1->sent == SCTP_DATAGRAM_ACKED) { 4793 tp1->sent = SCTP_DATAGRAM_SENT; 4794 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 4795 sctp_misc_ints(SCTP_FLIGHT_LOG_UP_REVOKE, 4796 tp1->whoTo->flight_size, 4797 tp1->book_size, 4798 (uintptr_t) tp1->whoTo, 4799 tp1->rec.data.TSN_seq); 4800 } 4801 sctp_flight_size_increase(tp1); 4802 sctp_total_flight_increase(stcb, tp1); 4803 tp1->rec.data.chunk_was_revoked = 1; 4804 /* 4805 * To ensure that this increase in 4806 * flightsize, which is artificial, does not 4807 * throttle the sender, we also increase the 4808 * cwnd artificially. 4809 */ 4810 tp1->whoTo->cwnd += tp1->book_size; 4811 cnt_revoked++; 4812 } 4813 } 4814 if (cnt_revoked) { 4815 reneged_all = 1; 4816 } 4817 asoc->saw_sack_with_frags = 0; 4818 } 4819 if (num_nr_seg > 0) 4820 asoc->saw_sack_with_nr_frags = 1; 4821 else 4822 asoc->saw_sack_with_nr_frags = 0; 4823 4824 /* JRS - Use the congestion control given in the CC module */ 4825 if (ecne_seen == 0) { 4826 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4827 if (net->net_ack2 > 0) { 4828 /* 4829 * Karn's rule applies to clearing error 4830 * count, this is optional. 4831 */ 4832 net->error_count = 0; 4833 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) { 4834 /* addr came good */ 4835 net->dest_state |= SCTP_ADDR_REACHABLE; 4836 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 4837 0, (void *)net, SCTP_SO_NOT_LOCKED); 4838 } 4839 if (net == stcb->asoc.primary_destination) { 4840 if (stcb->asoc.alternate) { 4841 /* 4842 * release the alternate, 4843 * primary is good 4844 */ 4845 sctp_free_remote_addr(stcb->asoc.alternate); 4846 stcb->asoc.alternate = NULL; 4847 } 4848 } 4849 if (net->dest_state & SCTP_ADDR_PF) { 4850 net->dest_state &= ~SCTP_ADDR_PF; 4851 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 4852 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 4853 asoc->cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 4854 /* Done with this net */ 4855 net->net_ack = 0; 4856 } 4857 /* restore any doubled timers */ 4858 net->RTO = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv; 4859 if (net->RTO < stcb->asoc.minrto) { 4860 net->RTO = stcb->asoc.minrto; 4861 } 4862 if (net->RTO > stcb->asoc.maxrto) { 4863 net->RTO = stcb->asoc.maxrto; 4864 } 4865 } 4866 } 4867 asoc->cc_functions.sctp_cwnd_update_after_sack(stcb, asoc, accum_moved, reneged_all, will_exit_fast_recovery); 4868 } 4869 if (TAILQ_EMPTY(&asoc->sent_queue)) { 4870 /* nothing left in-flight */ 4871 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4872 /* stop all timers */ 4873 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 4874 stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_30); 4875 net->flight_size = 0; 4876 net->partial_bytes_acked = 0; 4877 } 4878 asoc->total_flight = 0; 4879 asoc->total_flight_count = 0; 4880 } 4881 /**********************************/ 4882 /* Now what about shutdown issues */ 4883 /**********************************/ 4884 if (TAILQ_EMPTY(&asoc->send_queue) && TAILQ_EMPTY(&asoc->sent_queue)) { 4885 /* nothing left on sendqueue.. consider done */ 4886 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) { 4887 sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK, 4888 asoc->peers_rwnd, 0, 0, a_rwnd); 4889 } 4890 asoc->peers_rwnd = a_rwnd; 4891 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4892 /* SWS sender side engages */ 4893 asoc->peers_rwnd = 0; 4894 } 4895 /* clean up */ 4896 if ((asoc->stream_queue_cnt == 1) && 4897 ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) || 4898 (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED)) && 4899 (asoc->locked_on_sending) 4900 ) { 4901 struct sctp_stream_queue_pending *sp; 4902 4903 /* 4904 * I may be in a state where we got all across.. but 4905 * cannot write more due to a shutdown... we abort 4906 * since the user did not indicate EOR in this case. 4907 */ 4908 sp = TAILQ_LAST(&((asoc->locked_on_sending)->outqueue), 4909 sctp_streamhead); 4910 if ((sp) && (sp->length == 0)) { 4911 asoc->locked_on_sending = NULL; 4912 if (sp->msg_is_complete) { 4913 asoc->stream_queue_cnt--; 4914 } else { 4915 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT; 4916 asoc->stream_queue_cnt--; 4917 } 4918 } 4919 } 4920 if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) && 4921 (asoc->stream_queue_cnt == 0)) { 4922 if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) { 4923 /* Need to abort here */ 4924 struct mbuf *oper; 4925 4926 abort_out_now: 4927 *abort_now = 1; 4928 /* XXX */ 4929 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)), 4930 0, M_DONTWAIT, 1, MT_DATA); 4931 if (oper) { 4932 struct sctp_paramhdr *ph; 4933 uint32_t *ippp; 4934 4935 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + 4936 sizeof(uint32_t); 4937 ph = mtod(oper, struct sctp_paramhdr *); 4938 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT); 4939 ph->param_length = htons(SCTP_BUF_LEN(oper)); 4940 ippp = (uint32_t *) (ph + 1); 4941 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_31); 4942 } 4943 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_31; 4944 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED); 4945 return; 4946 } else { 4947 struct sctp_nets *netp; 4948 4949 if (asoc->alternate) { 4950 netp = asoc->alternate; 4951 } else { 4952 netp = asoc->primary_destination; 4953 } 4954 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 4955 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 4956 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 4957 } 4958 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT); 4959 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 4960 sctp_stop_timers_for_shutdown(stcb); 4961 sctp_send_shutdown(stcb, netp); 4962 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, 4963 stcb->sctp_ep, stcb, netp); 4964 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 4965 stcb->sctp_ep, stcb, netp); 4966 } 4967 return; 4968 } else if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) && 4969 (asoc->stream_queue_cnt == 0)) { 4970 struct sctp_nets *netp; 4971 4972 if (asoc->alternate) { 4973 netp = asoc->alternate; 4974 } else { 4975 netp = asoc->primary_destination; 4976 } 4977 if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) { 4978 goto abort_out_now; 4979 } 4980 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 4981 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 4982 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 4983 sctp_send_shutdown_ack(stcb, netp); 4984 sctp_stop_timers_for_shutdown(stcb); 4985 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, 4986 stcb->sctp_ep, stcb, netp); 4987 return; 4988 } 4989 } 4990 /* 4991 * Now here we are going to recycle net_ack for a different use... 4992 * HEADS UP. 4993 */ 4994 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 4995 net->net_ack = 0; 4996 } 4997 4998 /* 4999 * CMT DAC algorithm: If SACK DAC flag was 0, then no extra marking 5000 * to be done. Setting this_sack_lowest_newack to the cum_ack will 5001 * automatically ensure that. 5002 */ 5003 if ((asoc->sctp_cmt_on_off > 0) && 5004 SCTP_BASE_SYSCTL(sctp_cmt_use_dac) && 5005 (cmt_dac_flag == 0)) { 5006 this_sack_lowest_newack = cum_ack; 5007 } 5008 if ((num_seg > 0) || (num_nr_seg > 0)) { 5009 sctp_strike_gap_ack_chunks(stcb, asoc, biggest_tsn_acked, 5010 biggest_tsn_newly_acked, this_sack_lowest_newack, accum_moved); 5011 } 5012 /* JRS - Use the congestion control given in the CC module */ 5013 asoc->cc_functions.sctp_cwnd_update_after_fr(stcb, asoc); 5014 5015 /* Now are we exiting loss recovery ? */ 5016 if (will_exit_fast_recovery) { 5017 /* Ok, we must exit fast recovery */ 5018 asoc->fast_retran_loss_recovery = 0; 5019 } 5020 if ((asoc->sat_t3_loss_recovery) && 5021 SCTP_TSN_GE(asoc->last_acked_seq, asoc->sat_t3_recovery_tsn)) { 5022 /* end satellite t3 loss recovery */ 5023 asoc->sat_t3_loss_recovery = 0; 5024 } 5025 /* 5026 * CMT Fast recovery 5027 */ 5028 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 5029 if (net->will_exit_fast_recovery) { 5030 /* Ok, we must exit fast recovery */ 5031 net->fast_retran_loss_recovery = 0; 5032 } 5033 } 5034 5035 /* Adjust and set the new rwnd value */ 5036 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) { 5037 sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK, 5038 asoc->peers_rwnd, asoc->total_flight, (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)), a_rwnd); 5039 } 5040 asoc->peers_rwnd = sctp_sbspace_sub(a_rwnd, 5041 (uint32_t) (asoc->total_flight + (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)))); 5042 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 5043 /* SWS sender side engages */ 5044 asoc->peers_rwnd = 0; 5045 } 5046 if (asoc->peers_rwnd > old_rwnd) { 5047 win_probe_recovery = 1; 5048 } 5049 /* 5050 * Now we must setup so we have a timer up for anyone with 5051 * outstanding data. 5052 */ 5053 done_once = 0; 5054again: 5055 j = 0; 5056 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 5057 if (win_probe_recovery && (net->window_probe)) { 5058 win_probe_recovered = 1; 5059 /*- 5060 * Find first chunk that was used with 5061 * window probe and clear the event. Put 5062 * it back into the send queue as if has 5063 * not been sent. 5064 */ 5065 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 5066 if (tp1->window_probe) { 5067 sctp_window_probe_recovery(stcb, asoc, tp1); 5068 break; 5069 } 5070 } 5071 } 5072 if (net->flight_size) { 5073 j++; 5074 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { 5075 sctp_timer_start(SCTP_TIMER_TYPE_SEND, 5076 stcb->sctp_ep, stcb, net); 5077 } 5078 if (net->window_probe) { 5079 net->window_probe = 0; 5080 } 5081 } else { 5082 if (net->window_probe) { 5083 /* 5084 * In window probes we must assure a timer 5085 * is still running there 5086 */ 5087 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { 5088 sctp_timer_start(SCTP_TIMER_TYPE_SEND, 5089 stcb->sctp_ep, stcb, net); 5090 5091 } 5092 } else if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { 5093 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 5094 stcb, net, 5095 SCTP_FROM_SCTP_INDATA + SCTP_LOC_22); 5096 } 5097 } 5098 } 5099 if ((j == 0) && 5100 (!TAILQ_EMPTY(&asoc->sent_queue)) && 5101 (asoc->sent_queue_retran_cnt == 0) && 5102 (win_probe_recovered == 0) && 5103 (done_once == 0)) { 5104 /* 5105 * huh, this should not happen unless all packets are 5106 * PR-SCTP and marked to skip of course. 5107 */ 5108 if (sctp_fs_audit(asoc)) { 5109 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 5110 net->flight_size = 0; 5111 } 5112 asoc->total_flight = 0; 5113 asoc->total_flight_count = 0; 5114 asoc->sent_queue_retran_cnt = 0; 5115 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { 5116 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 5117 sctp_flight_size_increase(tp1); 5118 sctp_total_flight_increase(stcb, tp1); 5119 } else if (tp1->sent == SCTP_DATAGRAM_RESEND) { 5120 sctp_ucount_incr(asoc->sent_queue_retran_cnt); 5121 } 5122 } 5123 } 5124 done_once = 1; 5125 goto again; 5126 } 5127 /*********************************************/ 5128 /* Here we perform PR-SCTP procedures */ 5129 /* (section 4.2) */ 5130 /*********************************************/ 5131 /* C1. update advancedPeerAckPoint */ 5132 if (SCTP_TSN_GT(cum_ack, asoc->advanced_peer_ack_point)) { 5133 asoc->advanced_peer_ack_point = cum_ack; 5134 } 5135 /* C2. try to further move advancedPeerAckPoint ahead */ 5136 if ((asoc->peer_supports_prsctp) && (asoc->pr_sctp_cnt > 0)) { 5137 struct sctp_tmit_chunk *lchk; 5138 uint32_t old_adv_peer_ack_point; 5139 5140 old_adv_peer_ack_point = asoc->advanced_peer_ack_point; 5141 lchk = sctp_try_advance_peer_ack_point(stcb, asoc); 5142 /* C3. See if we need to send a Fwd-TSN */ 5143 if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, cum_ack)) { 5144 /* 5145 * ISSUE with ECN, see FWD-TSN processing. 5146 */ 5147 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) { 5148 sctp_misc_ints(SCTP_FWD_TSN_CHECK, 5149 0xee, cum_ack, asoc->advanced_peer_ack_point, 5150 old_adv_peer_ack_point); 5151 } 5152 if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, old_adv_peer_ack_point)) { 5153 send_forward_tsn(stcb, asoc); 5154 } else if (lchk) { 5155 /* try to FR fwd-tsn's that get lost too */ 5156 if (lchk->rec.data.fwd_tsn_cnt >= 3) { 5157 send_forward_tsn(stcb, asoc); 5158 } 5159 } 5160 } 5161 if (lchk) { 5162 /* Assure a timer is up */ 5163 sctp_timer_start(SCTP_TIMER_TYPE_SEND, 5164 stcb->sctp_ep, stcb, lchk->whoTo); 5165 } 5166 } 5167 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_RWND_LOGGING_ENABLE) { 5168 sctp_misc_ints(SCTP_SACK_RWND_UPDATE, 5169 a_rwnd, 5170 stcb->asoc.peers_rwnd, 5171 stcb->asoc.total_flight, 5172 stcb->asoc.total_output_queue_size); 5173 } 5174} 5175 5176void 5177sctp_update_acked(struct sctp_tcb *stcb, struct sctp_shutdown_chunk *cp, int *abort_flag) 5178{ 5179 /* Copy cum-ack */ 5180 uint32_t cum_ack, a_rwnd; 5181 5182 cum_ack = ntohl(cp->cumulative_tsn_ack); 5183 /* Arrange so a_rwnd does NOT change */ 5184 a_rwnd = stcb->asoc.peers_rwnd + stcb->asoc.total_flight; 5185 5186 /* Now call the express sack handling */ 5187 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, abort_flag, 0); 5188} 5189 5190static void 5191sctp_kick_prsctp_reorder_queue(struct sctp_tcb *stcb, 5192 struct sctp_stream_in *strmin) 5193{ 5194 struct sctp_queued_to_read *ctl, *nctl; 5195 struct sctp_association *asoc; 5196 uint16_t tt; 5197 5198 asoc = &stcb->asoc; 5199 tt = strmin->last_sequence_delivered; 5200 /* 5201 * First deliver anything prior to and including the stream no that 5202 * came in 5203 */ 5204 TAILQ_FOREACH_SAFE(ctl, &strmin->inqueue, next, nctl) { 5205 if (SCTP_SSN_GE(tt, ctl->sinfo_ssn)) { 5206 /* this is deliverable now */ 5207 TAILQ_REMOVE(&strmin->inqueue, ctl, next); 5208 /* subtract pending on streams */ 5209 asoc->size_on_all_streams -= ctl->length; 5210 sctp_ucount_decr(asoc->cnt_on_all_streams); 5211 /* deliver it to at least the delivery-q */ 5212 if (stcb->sctp_socket) { 5213 sctp_mark_non_revokable(asoc, ctl->sinfo_tsn); 5214 sctp_add_to_readq(stcb->sctp_ep, stcb, 5215 ctl, 5216 &stcb->sctp_socket->so_rcv, 1, SCTP_READ_LOCK_HELD, SCTP_SO_NOT_LOCKED); 5217 } 5218 } else { 5219 /* no more delivery now. */ 5220 break; 5221 } 5222 } 5223 /* 5224 * now we must deliver things in queue the normal way if any are 5225 * now ready. 5226 */ 5227 tt = strmin->last_sequence_delivered + 1; 5228 TAILQ_FOREACH_SAFE(ctl, &strmin->inqueue, next, nctl) { 5229 if (tt == ctl->sinfo_ssn) { 5230 /* this is deliverable now */ 5231 TAILQ_REMOVE(&strmin->inqueue, ctl, next); 5232 /* subtract pending on streams */ 5233 asoc->size_on_all_streams -= ctl->length; 5234 sctp_ucount_decr(asoc->cnt_on_all_streams); 5235 /* deliver it to at least the delivery-q */ 5236 strmin->last_sequence_delivered = ctl->sinfo_ssn; 5237 if (stcb->sctp_socket) { 5238 sctp_mark_non_revokable(asoc, ctl->sinfo_tsn); 5239 sctp_add_to_readq(stcb->sctp_ep, stcb, 5240 ctl, 5241 &stcb->sctp_socket->so_rcv, 1, SCTP_READ_LOCK_HELD, SCTP_SO_NOT_LOCKED); 5242 5243 } 5244 tt = strmin->last_sequence_delivered + 1; 5245 } else { 5246 break; 5247 } 5248 } 5249} 5250 5251static void 5252sctp_flush_reassm_for_str_seq(struct sctp_tcb *stcb, 5253 struct sctp_association *asoc, 5254 uint16_t stream, uint16_t seq) 5255{ 5256 struct sctp_tmit_chunk *chk, *nchk; 5257 5258 /* For each one on here see if we need to toss it */ 5259 /* 5260 * For now large messages held on the reasmqueue that are complete 5261 * will be tossed too. We could in theory do more work to spin 5262 * through and stop after dumping one msg aka seeing the start of a 5263 * new msg at the head, and call the delivery function... to see if 5264 * it can be delivered... But for now we just dump everything on the 5265 * queue. 5266 */ 5267 TAILQ_FOREACH_SAFE(chk, &asoc->reasmqueue, sctp_next, nchk) { 5268 /* 5269 * Do not toss it if on a different stream or marked for 5270 * unordered delivery in which case the stream sequence 5271 * number has no meaning. 5272 */ 5273 if ((chk->rec.data.stream_number != stream) || 5274 ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == SCTP_DATA_UNORDERED)) { 5275 continue; 5276 } 5277 if (chk->rec.data.stream_seq == seq) { 5278 /* It needs to be tossed */ 5279 TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next); 5280 if (SCTP_TSN_GT(chk->rec.data.TSN_seq, asoc->tsn_last_delivered)) { 5281 asoc->tsn_last_delivered = chk->rec.data.TSN_seq; 5282 asoc->str_of_pdapi = chk->rec.data.stream_number; 5283 asoc->ssn_of_pdapi = chk->rec.data.stream_seq; 5284 asoc->fragment_flags = chk->rec.data.rcv_flags; 5285 } 5286 asoc->size_on_reasm_queue -= chk->send_size; 5287 sctp_ucount_decr(asoc->cnt_on_reasm_queue); 5288 5289 /* Clear up any stream problem */ 5290 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) != SCTP_DATA_UNORDERED && 5291 SCTP_SSN_GT(chk->rec.data.stream_seq, asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered)) { 5292 /* 5293 * We must dump forward this streams 5294 * sequence number if the chunk is not 5295 * unordered that is being skipped. There is 5296 * a chance that if the peer does not 5297 * include the last fragment in its FWD-TSN 5298 * we WILL have a problem here since you 5299 * would have a partial chunk in queue that 5300 * may not be deliverable. Also if a Partial 5301 * delivery API as started the user may get 5302 * a partial chunk. The next read returning 5303 * a new chunk... really ugly but I see no 5304 * way around it! Maybe a notify?? 5305 */ 5306 asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered = chk->rec.data.stream_seq; 5307 } 5308 if (chk->data) { 5309 sctp_m_freem(chk->data); 5310 chk->data = NULL; 5311 } 5312 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 5313 } else if (SCTP_SSN_GT(chk->rec.data.stream_seq, seq)) { 5314 /* 5315 * If the stream_seq is > than the purging one, we 5316 * are done 5317 */ 5318 break; 5319 } 5320 } 5321} 5322 5323 5324void 5325sctp_handle_forward_tsn(struct sctp_tcb *stcb, 5326 struct sctp_forward_tsn_chunk *fwd, 5327 int *abort_flag, struct mbuf *m, int offset) 5328{ 5329 /* The pr-sctp fwd tsn */ 5330 /* 5331 * here we will perform all the data receiver side steps for 5332 * processing FwdTSN, as required in by pr-sctp draft: 5333 * 5334 * Assume we get FwdTSN(x): 5335 * 5336 * 1) update local cumTSN to x 2) try to further advance cumTSN to x + 5337 * others we have 3) examine and update re-ordering queue on 5338 * pr-in-streams 4) clean up re-assembly queue 5) Send a sack to 5339 * report where we are. 5340 */ 5341 struct sctp_association *asoc; 5342 uint32_t new_cum_tsn, gap; 5343 unsigned int i, fwd_sz, m_size; 5344 uint32_t str_seq; 5345 struct sctp_stream_in *strm; 5346 struct sctp_tmit_chunk *chk, *nchk; 5347 struct sctp_queued_to_read *ctl, *sv; 5348 5349 asoc = &stcb->asoc; 5350 if ((fwd_sz = ntohs(fwd->ch.chunk_length)) < sizeof(struct sctp_forward_tsn_chunk)) { 5351 SCTPDBG(SCTP_DEBUG_INDATA1, 5352 "Bad size too small/big fwd-tsn\n"); 5353 return; 5354 } 5355 m_size = (stcb->asoc.mapping_array_size << 3); 5356 /*************************************************************/ 5357 /* 1. Here we update local cumTSN and shift the bitmap array */ 5358 /*************************************************************/ 5359 new_cum_tsn = ntohl(fwd->new_cumulative_tsn); 5360 5361 if (SCTP_TSN_GE(asoc->cumulative_tsn, new_cum_tsn)) { 5362 /* Already got there ... */ 5363 return; 5364 } 5365 /* 5366 * now we know the new TSN is more advanced, let's find the actual 5367 * gap 5368 */ 5369 SCTP_CALC_TSN_TO_GAP(gap, new_cum_tsn, asoc->mapping_array_base_tsn); 5370 asoc->cumulative_tsn = new_cum_tsn; 5371 if (gap >= m_size) { 5372 if ((long)gap > sctp_sbspace(&stcb->asoc, &stcb->sctp_socket->so_rcv)) { 5373 struct mbuf *oper; 5374 5375 /* 5376 * out of range (of single byte chunks in the rwnd I 5377 * give out). This must be an attacker. 5378 */ 5379 *abort_flag = 1; 5380 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 5381 0, M_DONTWAIT, 1, MT_DATA); 5382 if (oper) { 5383 struct sctp_paramhdr *ph; 5384 uint32_t *ippp; 5385 5386 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + 5387 (sizeof(uint32_t) * 3); 5388 ph = mtod(oper, struct sctp_paramhdr *); 5389 ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 5390 ph->param_length = htons(SCTP_BUF_LEN(oper)); 5391 ippp = (uint32_t *) (ph + 1); 5392 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_33); 5393 ippp++; 5394 *ippp = asoc->highest_tsn_inside_map; 5395 ippp++; 5396 *ippp = new_cum_tsn; 5397 } 5398 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_33; 5399 sctp_abort_an_association(stcb->sctp_ep, stcb, oper, SCTP_SO_NOT_LOCKED); 5400 return; 5401 } 5402 SCTP_STAT_INCR(sctps_fwdtsn_map_over); 5403 5404 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 5405 asoc->mapping_array_base_tsn = new_cum_tsn + 1; 5406 asoc->highest_tsn_inside_map = new_cum_tsn; 5407 5408 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 5409 asoc->highest_tsn_inside_nr_map = new_cum_tsn; 5410 5411 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 5412 sctp_log_map(0, 3, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 5413 } 5414 } else { 5415 SCTP_TCB_LOCK_ASSERT(stcb); 5416 for (i = 0; i <= gap; i++) { 5417 if (!SCTP_IS_TSN_PRESENT(asoc->mapping_array, i) && 5418 !SCTP_IS_TSN_PRESENT(asoc->nr_mapping_array, i)) { 5419 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, i); 5420 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn + i, asoc->highest_tsn_inside_nr_map)) { 5421 asoc->highest_tsn_inside_nr_map = asoc->mapping_array_base_tsn + i; 5422 } 5423 } 5424 } 5425 } 5426 /*************************************************************/ 5427 /* 2. Clear up re-assembly queue */ 5428 /*************************************************************/ 5429 /* 5430 * First service it if pd-api is up, just in case we can progress it 5431 * forward 5432 */ 5433 if (asoc->fragmented_delivery_inprogress) { 5434 sctp_service_reassembly(stcb, asoc); 5435 } 5436 /* For each one on here see if we need to toss it */ 5437 /* 5438 * For now large messages held on the reasmqueue that are complete 5439 * will be tossed too. We could in theory do more work to spin 5440 * through and stop after dumping one msg aka seeing the start of a 5441 * new msg at the head, and call the delivery function... to see if 5442 * it can be delivered... But for now we just dump everything on the 5443 * queue. 5444 */ 5445 TAILQ_FOREACH_SAFE(chk, &asoc->reasmqueue, sctp_next, nchk) { 5446 if (SCTP_TSN_GE(new_cum_tsn, chk->rec.data.TSN_seq)) { 5447 /* It needs to be tossed */ 5448 TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next); 5449 if (SCTP_TSN_GT(chk->rec.data.TSN_seq, asoc->tsn_last_delivered)) { 5450 asoc->tsn_last_delivered = chk->rec.data.TSN_seq; 5451 asoc->str_of_pdapi = chk->rec.data.stream_number; 5452 asoc->ssn_of_pdapi = chk->rec.data.stream_seq; 5453 asoc->fragment_flags = chk->rec.data.rcv_flags; 5454 } 5455 asoc->size_on_reasm_queue -= chk->send_size; 5456 sctp_ucount_decr(asoc->cnt_on_reasm_queue); 5457 5458 /* Clear up any stream problem */ 5459 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) != SCTP_DATA_UNORDERED && 5460 SCTP_SSN_GT(chk->rec.data.stream_seq, asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered)) { 5461 /* 5462 * We must dump forward this streams 5463 * sequence number if the chunk is not 5464 * unordered that is being skipped. There is 5465 * a chance that if the peer does not 5466 * include the last fragment in its FWD-TSN 5467 * we WILL have a problem here since you 5468 * would have a partial chunk in queue that 5469 * may not be deliverable. Also if a Partial 5470 * delivery API as started the user may get 5471 * a partial chunk. The next read returning 5472 * a new chunk... really ugly but I see no 5473 * way around it! Maybe a notify?? 5474 */ 5475 asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered = chk->rec.data.stream_seq; 5476 } 5477 if (chk->data) { 5478 sctp_m_freem(chk->data); 5479 chk->data = NULL; 5480 } 5481 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 5482 } else { 5483 /* 5484 * Ok we have gone beyond the end of the fwd-tsn's 5485 * mark. 5486 */ 5487 break; 5488 } 5489 } 5490 /*******************************************************/ 5491 /* 3. Update the PR-stream re-ordering queues and fix */ 5492 /* delivery issues as needed. */ 5493 /*******************************************************/ 5494 fwd_sz -= sizeof(*fwd); 5495 if (m && fwd_sz) { 5496 /* New method. */ 5497 unsigned int num_str; 5498 struct sctp_strseq *stseq, strseqbuf; 5499 5500 offset += sizeof(*fwd); 5501 5502 SCTP_INP_READ_LOCK(stcb->sctp_ep); 5503 num_str = fwd_sz / sizeof(struct sctp_strseq); 5504 for (i = 0; i < num_str; i++) { 5505 uint16_t st; 5506 5507 stseq = (struct sctp_strseq *)sctp_m_getptr(m, offset, 5508 sizeof(struct sctp_strseq), 5509 (uint8_t *) & strseqbuf); 5510 offset += sizeof(struct sctp_strseq); 5511 if (stseq == NULL) { 5512 break; 5513 } 5514 /* Convert */ 5515 st = ntohs(stseq->stream); 5516 stseq->stream = st; 5517 st = ntohs(stseq->sequence); 5518 stseq->sequence = st; 5519 5520 /* now process */ 5521 5522 /* 5523 * Ok we now look for the stream/seq on the read 5524 * queue where its not all delivered. If we find it 5525 * we transmute the read entry into a PDI_ABORTED. 5526 */ 5527 if (stseq->stream >= asoc->streamincnt) { 5528 /* screwed up streams, stop! */ 5529 break; 5530 } 5531 if ((asoc->str_of_pdapi == stseq->stream) && 5532 (asoc->ssn_of_pdapi == stseq->sequence)) { 5533 /* 5534 * If this is the one we were partially 5535 * delivering now then we no longer are. 5536 * Note this will change with the reassembly 5537 * re-write. 5538 */ 5539 asoc->fragmented_delivery_inprogress = 0; 5540 } 5541 sctp_flush_reassm_for_str_seq(stcb, asoc, stseq->stream, stseq->sequence); 5542 TAILQ_FOREACH(ctl, &stcb->sctp_ep->read_queue, next) { 5543 if ((ctl->sinfo_stream == stseq->stream) && 5544 (ctl->sinfo_ssn == stseq->sequence)) { 5545 str_seq = (stseq->stream << 16) | stseq->sequence; 5546 ctl->end_added = 1; 5547 ctl->pdapi_aborted = 1; 5548 sv = stcb->asoc.control_pdapi; 5549 stcb->asoc.control_pdapi = ctl; 5550 sctp_ulp_notify(SCTP_NOTIFY_PARTIAL_DELVIERY_INDICATION, 5551 stcb, 5552 SCTP_PARTIAL_DELIVERY_ABORTED, 5553 (void *)&str_seq, 5554 SCTP_SO_NOT_LOCKED); 5555 stcb->asoc.control_pdapi = sv; 5556 break; 5557 } else if ((ctl->sinfo_stream == stseq->stream) && 5558 SCTP_SSN_GT(ctl->sinfo_ssn, stseq->sequence)) { 5559 /* We are past our victim SSN */ 5560 break; 5561 } 5562 } 5563 strm = &asoc->strmin[stseq->stream]; 5564 if (SCTP_SSN_GT(stseq->sequence, strm->last_sequence_delivered)) { 5565 /* Update the sequence number */ 5566 strm->last_sequence_delivered = stseq->sequence; 5567 } 5568 /* now kick the stream the new way */ 5569 /* sa_ignore NO_NULL_CHK */ 5570 sctp_kick_prsctp_reorder_queue(stcb, strm); 5571 } 5572 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 5573 } 5574 /* 5575 * Now slide thing forward. 5576 */ 5577 sctp_slide_mapping_arrays(stcb); 5578 5579 if (!TAILQ_EMPTY(&asoc->reasmqueue)) { 5580 /* now lets kick out and check for more fragmented delivery */ 5581 /* sa_ignore NO_NULL_CHK */ 5582 sctp_deliver_reasm_check(stcb, &stcb->asoc); 5583 } 5584} 5585