sys/netinet/sctp_indata.c

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