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         /*
 254          * Make sure that there is no un-initialized padding between the
 255          * cmsg header and cmsg data and after the cmsg data.
 256          */
 257         memset(cmh, 0, len);
 258         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVRCVINFO)) {
 259                 cmh->cmsg_level = IPPROTO_SCTP;
 260                 cmh->cmsg_len = CMSG_LEN(sizeof(struct sctp_rcvinfo));
 261                 cmh->cmsg_type = SCTP_RCVINFO;
 262                 rcvinfo = (struct sctp_rcvinfo *)CMSG_DATA(cmh);
 263                 rcvinfo->rcv_sid = sinfo->sinfo_stream;
 264                 rcvinfo->rcv_ssn = sinfo->sinfo_ssn;
 265                 rcvinfo->rcv_flags = sinfo->sinfo_flags;
 266                 rcvinfo->rcv_ppid = sinfo->sinfo_ppid;
 267                 rcvinfo->rcv_tsn = sinfo->sinfo_tsn;
 268                 rcvinfo->rcv_cumtsn = sinfo->sinfo_cumtsn;
 269                 rcvinfo->rcv_context = sinfo->sinfo_context;
 270                 rcvinfo->rcv_assoc_id = sinfo->sinfo_assoc_id;
 271                 cmh = (struct cmsghdr *)((caddr_t)cmh + CMSG_SPACE(sizeof(struct sctp_rcvinfo)));
 272                 SCTP_BUF_LEN(ret) += CMSG_SPACE(sizeof(struct sctp_rcvinfo));
 273         }
 274         if (provide_nxt) {
 275                 cmh->cmsg_level = IPPROTO_SCTP;
 276                 cmh->cmsg_len = CMSG_LEN(sizeof(struct sctp_nxtinfo));
 277                 cmh->cmsg_type = SCTP_NXTINFO;
 278                 nxtinfo = (struct sctp_nxtinfo *)CMSG_DATA(cmh);
 279                 nxtinfo->nxt_sid = seinfo->sreinfo_next_stream;
 280                 nxtinfo->nxt_flags = 0;
 281                 if (seinfo->sreinfo_next_flags & SCTP_NEXT_MSG_IS_UNORDERED) {
 282                         nxtinfo->nxt_flags |= SCTP_UNORDERED;
 283                 }
 284                 if (seinfo->sreinfo_next_flags & SCTP_NEXT_MSG_IS_NOTIFICATION) {
 285                         nxtinfo->nxt_flags |= SCTP_NOTIFICATION;
 286                 }
 287                 if (seinfo->sreinfo_next_flags & SCTP_NEXT_MSG_ISCOMPLETE) {
 288                         nxtinfo->nxt_flags |= SCTP_COMPLETE;
 289                 }
 290                 nxtinfo->nxt_ppid = seinfo->sreinfo_next_ppid;
 291                 nxtinfo->nxt_length = seinfo->sreinfo_next_length;
 292                 nxtinfo->nxt_assoc_id = seinfo->sreinfo_next_aid;
 293                 cmh = (struct cmsghdr *)((caddr_t)cmh + CMSG_SPACE(sizeof(struct sctp_nxtinfo)));
 294                 SCTP_BUF_LEN(ret) += CMSG_SPACE(sizeof(struct sctp_nxtinfo));
 295         }
 296         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVDATAIOEVNT)) {
 297                 cmh->cmsg_level = IPPROTO_SCTP;
 298                 outinfo = (struct sctp_sndrcvinfo *)CMSG_DATA(cmh);
 299                 if (use_extended) {
 300                         cmh->cmsg_len = CMSG_LEN(sizeof(struct sctp_extrcvinfo));
 301                         cmh->cmsg_type = SCTP_EXTRCV;
 302                         memcpy(outinfo, sinfo, sizeof(struct sctp_extrcvinfo));
 303                         SCTP_BUF_LEN(ret) += CMSG_SPACE(sizeof(struct sctp_extrcvinfo));
 304                 } else {
 305                         cmh->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo));
 306                         cmh->cmsg_type = SCTP_SNDRCV;
 307                         *outinfo = *sinfo;
 308                         SCTP_BUF_LEN(ret) += CMSG_SPACE(sizeof(struct sctp_sndrcvinfo));
 309                 }
 310         }
 311         return (ret);
 312 }
 313
 314
 315 static void
 316 sctp_mark_non_revokable(struct sctp_association *asoc, uint32_t tsn)
 317 {
 318         uint32_t gap, i, cumackp1;
 319         int fnd = 0;
 320
 321         if (SCTP_BASE_SYSCTL(sctp_do_drain) == 0) {
 322                 return;
 323         }
 324         cumackp1 = asoc->cumulative_tsn + 1;
 325         if (SCTP_TSN_GT(cumackp1, tsn)) {
 326                 /*
 327                  * this tsn is behind the cum ack and thus we don't need to
 328                  * worry about it being moved from one to the other.
 329                  */
 330                 return;
 331         }
 332         SCTP_CALC_TSN_TO_GAP(gap, tsn, asoc->mapping_array_base_tsn);
 333         if (!SCTP_IS_TSN_PRESENT(asoc->mapping_array, gap)) {
 334                 SCTP_PRINTF("gap:%x tsn:%x\n", gap, tsn);
 335                 sctp_print_mapping_array(asoc);
 336 #ifdef INVARIANTS
 337                 panic("Things are really messed up now!!");
 338 #endif
 339         }
 340         SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap);
 341         SCTP_UNSET_TSN_PRESENT(asoc->mapping_array, gap);
 342         if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) {
 343                 asoc->highest_tsn_inside_nr_map = tsn;
 344         }
 345         if (tsn == asoc->highest_tsn_inside_map) {
 346                 /* We must back down to see what the new highest is */
 347                 for (i = tsn - 1; SCTP_TSN_GE(i, asoc->mapping_array_base_tsn); i--) {
 348                         SCTP_CALC_TSN_TO_GAP(gap, i, asoc->mapping_array_base_tsn);
 349                         if (SCTP_IS_TSN_PRESENT(asoc->mapping_array, gap)) {
 350                                 asoc->highest_tsn_inside_map = i;
 351                                 fnd = 1;
 352                                 break;
 353                         }
 354                 }
 355                 if (!fnd) {
 356                         asoc->highest_tsn_inside_map = asoc->mapping_array_base_tsn - 1;
 357                 }
 358         }
 359 }
 360
 361
 362 /*
 363  * We are delivering currently from the reassembly queue. We must continue to
 364  * deliver until we either: 1) run out of space. 2) run out of sequential
 365  * TSN's 3) hit the SCTP_DATA_LAST_FRAG flag.
 366  */
 367 static void
 368 sctp_service_reassembly(struct sctp_tcb *stcb, struct sctp_association *asoc)
 369 {
 370         struct sctp_tmit_chunk *chk, *nchk;
 371         uint16_t nxt_todel;
 372         uint16_t stream_no;
 373         int end = 0;
 374         int cntDel;
 375         struct sctp_queued_to_read *control, *ctl, *nctl;
 376
 377         if (stcb == NULL)
 378                 return;
 379
 380         cntDel = stream_no = 0;
 381         if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
 382             (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
 383             (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET)) {
 384                 /* socket above is long gone or going.. */
 385 abandon:
 386                 asoc->fragmented_delivery_inprogress = 0;
 387                 TAILQ_FOREACH_SAFE(chk, &asoc->reasmqueue, sctp_next, nchk) {
 388                         TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next);
 389                         asoc->size_on_reasm_queue -= chk->send_size;
 390                         sctp_ucount_decr(asoc->cnt_on_reasm_queue);
 391                         /*
 392                          * Lose the data pointer, since its in the socket
 393                          * buffer
 394                          */
 395                         if (chk->data) {
 396                                 sctp_m_freem(chk->data);
 397                                 chk->data = NULL;
 398                         }
 399                         /* Now free the address and data */
 400                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 401                         /* sa_ignore FREED_MEMORY */
 402                 }
 403                 return;
 404         }
 405         SCTP_TCB_LOCK_ASSERT(stcb);
 406         TAILQ_FOREACH_SAFE(chk, &asoc->reasmqueue, sctp_next, nchk) {
 407                 if (chk->rec.data.TSN_seq != (asoc->tsn_last_delivered + 1)) {
 408                         /* Can't deliver more :< */
 409                         return;
 410                 }
 411                 stream_no = chk->rec.data.stream_number;
 412                 nxt_todel = asoc->strmin[stream_no].last_sequence_delivered + 1;
 413                 if (nxt_todel != chk->rec.data.stream_seq &&
 414                     (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
 415                         /*
 416                          * Not the next sequence to deliver in its stream OR
 417                          * unordered
 418                          */
 419                         return;
 420                 }
 421                 if (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) {
 422
 423                         control = sctp_build_readq_entry_chk(stcb, chk);
 424                         if (control == NULL) {
 425                                 /* out of memory? */
 426                                 return;
 427                         }
 428                         /* save it off for our future deliveries */
 429                         stcb->asoc.control_pdapi = control;
 430                         if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG)
 431                                 end = 1;
 432                         else
 433                                 end = 0;
 434                         sctp_mark_non_revokable(asoc, chk->rec.data.TSN_seq);
 435                         sctp_add_to_readq(stcb->sctp_ep,
 436                             stcb, control, &stcb->sctp_socket->so_rcv, end,
 437                             SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED);
 438                         cntDel++;
 439                 } else {
 440                         if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG)
 441                                 end = 1;
 442                         else
 443                                 end = 0;
 444                         sctp_mark_non_revokable(asoc, chk->rec.data.TSN_seq);
 445                         if (sctp_append_to_readq(stcb->sctp_ep, stcb,
 446                             stcb->asoc.control_pdapi,
 447                             chk->data, end, chk->rec.data.TSN_seq,
 448                             &stcb->sctp_socket->so_rcv)) {
 449                                 /*
 450                                  * something is very wrong, either
 451                                  * control_pdapi is NULL, or the tail_mbuf
 452                                  * is corrupt, or there is a EOM already on
 453                                  * the mbuf chain.
 454                                  */
 455                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
 456                                         goto abandon;
 457                                 } else {
 458 #ifdef INVARIANTS
 459                                         if ((stcb->asoc.control_pdapi == NULL) || (stcb->asoc.control_pdapi->tail_mbuf == NULL)) {
 460                                                 panic("This should not happen control_pdapi NULL?");
 461                                         }
 462                                         /* if we did not panic, it was a EOM */
 463                                         panic("Bad chunking ??");
 464 #else
 465                                         if ((stcb->asoc.control_pdapi == NULL) || (stcb->asoc.control_pdapi->tail_mbuf == NULL)) {
 466                                                 SCTP_PRINTF("This should not happen control_pdapi NULL?\n");
 467                                         }
 468                                         SCTP_PRINTF("Bad chunking ??\n");
 469                                         SCTP_PRINTF("Dumping re-assembly queue this will probably hose the association\n");
 470
 471 #endif
 472                                         goto abandon;
 473                                 }
 474                         }
 475                         cntDel++;
 476                 }
 477                 /* pull it we did it */
 478                 TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next);
 479                 if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) {
 480                         asoc->fragmented_delivery_inprogress = 0;
 481                         if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
 482                                 asoc->strmin[stream_no].last_sequence_delivered++;
 483                         }
 484                         if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0) {
 485                                 SCTP_STAT_INCR_COUNTER64(sctps_reasmusrmsgs);
 486                         }
 487                 } else if (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) {
 488                         /*
 489                          * turn the flag back on since we just  delivered
 490                          * yet another one.
 491                          */
 492                         asoc->fragmented_delivery_inprogress = 1;
 493                 }
 494                 asoc->tsn_of_pdapi_last_delivered = chk->rec.data.TSN_seq;
 495                 asoc->last_flags_delivered = chk->rec.data.rcv_flags;
 496                 asoc->last_strm_seq_delivered = chk->rec.data.stream_seq;
 497                 asoc->last_strm_no_delivered = chk->rec.data.stream_number;
 498
 499                 asoc->tsn_last_delivered = chk->rec.data.TSN_seq;
 500                 asoc->size_on_reasm_queue -= chk->send_size;
 501                 sctp_ucount_decr(asoc->cnt_on_reasm_queue);
 502                 /* free up the chk */
 503                 chk->data = NULL;
 504                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 505
 506                 if (asoc->fragmented_delivery_inprogress == 0) {
 507                         /*
 508                          * Now lets see if we can deliver the next one on
 509                          * the stream
 510                          */
 511                         struct sctp_stream_in *strm;
 512
 513                         strm = &asoc->strmin[stream_no];
 514                         nxt_todel = strm->last_sequence_delivered + 1;
 515                         TAILQ_FOREACH_SAFE(ctl, &strm->inqueue, next, nctl) {
 516                                 /* Deliver more if we can. */
 517                                 if (nxt_todel == ctl->sinfo_ssn) {
 518                                         TAILQ_REMOVE(&strm->inqueue, ctl, next);
 519                                         asoc->size_on_all_streams -= ctl->length;
 520                                         sctp_ucount_decr(asoc->cnt_on_all_streams);
 521                                         strm->last_sequence_delivered++;
 522                                         sctp_mark_non_revokable(asoc, ctl->sinfo_tsn);
 523                                         sctp_add_to_readq(stcb->sctp_ep, stcb,
 524                                             ctl,
 525                                             &stcb->sctp_socket->so_rcv, 1,
 526                                             SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED);
 527                                 } else {
 528                                         break;
 529                                 }
 530                                 nxt_todel = strm->last_sequence_delivered + 1;
 531                         }
 532                         break;
 533                 }
 534         }
 535 }
 536
 537 /*
 538  * Queue the chunk either right into the socket buffer if it is the next one
 539  * to go OR put it in the correct place in the delivery queue.  If we do
 540  * append to the so_buf, keep doing so until we are out of order. One big
 541  * question still remains, what to do when the socket buffer is FULL??
 542  */
 543 static void
 544 sctp_queue_data_to_stream(struct sctp_tcb *stcb, struct sctp_association *asoc,
 545     struct sctp_queued_to_read *control, int *abort_flag)
 546 {
 547         /*
 548          * FIX-ME maybe? What happens when the ssn wraps? If we are getting
 549          * all the data in one stream this could happen quite rapidly. One
 550          * could use the TSN to keep track of things, but this scheme breaks
 551          * down in the other type of stream useage that could occur. Send a
 552          * single msg to stream 0, send 4Billion messages to stream 1, now
 553          * send a message to stream 0. You have a situation where the TSN
 554          * has wrapped but not in the stream. Is this worth worrying about
 555          * or should we just change our queue sort at the bottom to be by
 556          * TSN.
 557          *
 558          * Could it also be legal for a peer to send ssn 1 with TSN 2 and ssn 2
 559          * with TSN 1? If the peer is doing some sort of funky TSN/SSN
 560          * assignment this could happen... and I don't see how this would be
 561          * a violation. So for now I am undecided an will leave the sort by
 562          * SSN alone. Maybe a hybred approach is the answer
 563          *
 564          */
 565         struct sctp_stream_in *strm;
 566         struct sctp_queued_to_read *at;
 567         int queue_needed;
 568         uint16_t nxt_todel;
 569         struct mbuf *op_err;
 570         char msg[SCTP_DIAG_INFO_LEN];
 571
 572         queue_needed = 1;
 573         asoc->size_on_all_streams += control->length;
 574         sctp_ucount_incr(asoc->cnt_on_all_streams);
 575         strm = &asoc->strmin[control->sinfo_stream];
 576         nxt_todel = strm->last_sequence_delivered + 1;
 577         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
 578                 sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_INTO_STRD);
 579         }
 580         SCTPDBG(SCTP_DEBUG_INDATA1,
 581             "queue to stream called for sid:%u ssn:%u tsn:%u lastdel:%u nxt:%u\n",
 582             (uint32_t) control->sinfo_stream, (uint32_t) control->sinfo_ssn,
 583             (uint32_t) control->sinfo_tsn,
 584             (uint32_t) strm->last_sequence_delivered, (uint32_t) nxt_todel);
 585         if (SCTP_SSN_GE(strm->last_sequence_delivered, control->sinfo_ssn)) {
 586                 /* The incoming sseq is behind where we last delivered? */
 587                 SCTPDBG(SCTP_DEBUG_INDATA1, "Duplicate S-SEQ:%d delivered:%d from peer, Abort association\n",
 588                     control->sinfo_ssn, strm->last_sequence_delivered);
 589 protocol_error:
 590                 /*
 591                  * throw it in the stream so it gets cleaned up in
 592                  * association destruction
 593                  */
 594                 TAILQ_INSERT_HEAD(&strm->inqueue, control, next);
 595                 snprintf(msg, sizeof(msg), "Delivered SSN=%4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
 596                     strm->last_sequence_delivered, control->sinfo_tsn,
 597                     control->sinfo_stream, control->sinfo_ssn);
 598                 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
 599                 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_1;
 600                 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
 601                 *abort_flag = 1;
 602                 return;
 603
 604         }
 605         if (nxt_todel == control->sinfo_ssn) {
 606                 /* can be delivered right away? */
 607                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
 608                         sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_IMMED_DEL);
 609                 }
 610                 /* EY it wont be queued if it could be delivered directly */
 611                 queue_needed = 0;
 612                 asoc->size_on_all_streams -= control->length;
 613                 sctp_ucount_decr(asoc->cnt_on_all_streams);
 614                 strm->last_sequence_delivered++;
 615
 616                 sctp_mark_non_revokable(asoc, control->sinfo_tsn);
 617                 sctp_add_to_readq(stcb->sctp_ep, stcb,
 618                     control,
 619                     &stcb->sctp_socket->so_rcv, 1,
 620                     SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED);
 621                 TAILQ_FOREACH_SAFE(control, &strm->inqueue, next, at) {
 622                         /* all delivered */
 623                         nxt_todel = strm->last_sequence_delivered + 1;
 624                         if (nxt_todel == control->sinfo_ssn) {
 625                                 TAILQ_REMOVE(&strm->inqueue, control, next);
 626                                 asoc->size_on_all_streams -= control->length;
 627                                 sctp_ucount_decr(asoc->cnt_on_all_streams);
 628                                 strm->last_sequence_delivered++;
 629                                 /*
 630                                  * We ignore the return of deliver_data here
 631                                  * since we always can hold the chunk on the
 632                                  * d-queue. And we have a finite number that
 633                                  * can be delivered from the strq.
 634                                  */
 635                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
 636                                         sctp_log_strm_del(control, NULL,
 637                                             SCTP_STR_LOG_FROM_IMMED_DEL);
 638                                 }
 639                                 sctp_mark_non_revokable(asoc, control->sinfo_tsn);
 640                                 sctp_add_to_readq(stcb->sctp_ep, stcb,
 641                                     control,
 642                                     &stcb->sctp_socket->so_rcv, 1,
 643                                     SCTP_READ_LOCK_NOT_HELD,
 644                                     SCTP_SO_NOT_LOCKED);
 645                                 continue;
 646                         }
 647                         break;
 648                 }
 649         }
 650         if (queue_needed) {
 651                 /*
 652                  * Ok, we did not deliver this guy, find the correct place
 653                  * to put it on the queue.
 654                  */
 655                 if (SCTP_TSN_GE(asoc->cumulative_tsn, control->sinfo_tsn)) {
 656                         goto protocol_error;
 657                 }
 658                 if (TAILQ_EMPTY(&strm->inqueue)) {
 659                         /* Empty queue */
 660                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
 661                                 sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_INSERT_HD);
 662                         }
 663                         TAILQ_INSERT_HEAD(&strm->inqueue, control, next);
 664                 } else {
 665                         TAILQ_FOREACH(at, &strm->inqueue, next) {
 666                                 if (SCTP_SSN_GT(at->sinfo_ssn, control->sinfo_ssn)) {
 667                                         /*
 668                                          * one in queue is bigger than the
 669                                          * new one, insert before this one
 670                                          */
 671                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
 672                                                 sctp_log_strm_del(control, at,
 673                                                     SCTP_STR_LOG_FROM_INSERT_MD);
 674                                         }
 675                                         TAILQ_INSERT_BEFORE(at, control, next);
 676                                         break;
 677                                 } else if (at->sinfo_ssn == control->sinfo_ssn) {
 678                                         /*
 679                                          * Gak, He sent me a duplicate str
 680                                          * seq number
 681                                          */
 682                                         /*
 683                                          * foo bar, I guess I will just free
 684                                          * this new guy, should we abort
 685                                          * too? FIX ME MAYBE? Or it COULD be
 686                                          * that the SSN's have wrapped.
 687                                          * Maybe I should compare to TSN
 688                                          * somehow... sigh for now just blow
 689                                          * away the chunk!
 690                                          */
 691
 692                                         if (control->data)
 693                                                 sctp_m_freem(control->data);
 694                                         control->data = NULL;
 695                                         asoc->size_on_all_streams -= control->length;
 696                                         sctp_ucount_decr(asoc->cnt_on_all_streams);
 697                                         if (control->whoFrom) {
 698                                                 sctp_free_remote_addr(control->whoFrom);
 699                                                 control->whoFrom = NULL;
 700                                         }
 701                                         sctp_free_a_readq(stcb, control);
 702                                         return;
 703                                 } else {
 704                                         if (TAILQ_NEXT(at, next) == NULL) {
 705                                                 /*
 706                                                  * We are at the end, insert
 707                                                  * it after this one
 708                                                  */
 709                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
 710                                                         sctp_log_strm_del(control, at,
 711                                                             SCTP_STR_LOG_FROM_INSERT_TL);
 712                                                 }
 713                                                 TAILQ_INSERT_AFTER(&strm->inqueue,
 714                                                     at, control, next);
 715                                                 break;
 716                                         }
 717                                 }
 718                         }
 719                 }
 720         }
 721 }
 722
 723 /*
 724  * Returns two things: You get the total size of the deliverable parts of the
 725  * first fragmented message on the reassembly queue. And you get a 1 back if
 726  * all of the message is ready or a 0 back if the message is still incomplete
 727  */
 728 static int
 729 sctp_is_all_msg_on_reasm(struct sctp_association *asoc, uint32_t * t_size)
 730 {
 731         struct sctp_tmit_chunk *chk;
 732         uint32_t tsn;
 733
 734         *t_size = 0;
 735         chk = TAILQ_FIRST(&asoc->reasmqueue);
 736         if (chk == NULL) {
 737                 /* nothing on the queue */
 738                 return (0);
 739         }
 740         if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0) {
 741                 /* Not a first on the queue */
 742                 return (0);
 743         }
 744         tsn = chk->rec.data.TSN_seq;
 745         TAILQ_FOREACH(chk, &asoc->reasmqueue, sctp_next) {
 746                 if (tsn != chk->rec.data.TSN_seq) {
 747                         return (0);
 748                 }
 749                 *t_size += chk->send_size;
 750                 if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) {
 751                         return (1);
 752                 }
 753                 tsn++;
 754         }
 755         return (0);
 756 }
 757
 758 static void
 759 sctp_deliver_reasm_check(struct sctp_tcb *stcb, struct sctp_association *asoc)
 760 {
 761         struct sctp_tmit_chunk *chk;
 762         uint16_t nxt_todel;
 763         uint32_t tsize, pd_point;
 764
 765 doit_again:
 766         chk = TAILQ_FIRST(&asoc->reasmqueue);
 767         if (chk == NULL) {
 768                 /* Huh? */
 769                 asoc->size_on_reasm_queue = 0;
 770                 asoc->cnt_on_reasm_queue = 0;
 771                 return;
 772         }
 773         if (asoc->fragmented_delivery_inprogress == 0) {
 774                 nxt_todel =
 775                     asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered + 1;
 776                 if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) &&
 777                     (nxt_todel == chk->rec.data.stream_seq ||
 778                     (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED))) {
 779                         /*
 780                          * Yep the first one is here and its ok to deliver
 781                          * but should we?
 782                          */
 783                         if (stcb->sctp_socket) {
 784                                 pd_point = min(SCTP_SB_LIMIT_RCV(stcb->sctp_socket) >> SCTP_PARTIAL_DELIVERY_SHIFT,
 785                                     stcb->sctp_ep->partial_delivery_point);
 786                         } else {
 787                                 pd_point = stcb->sctp_ep->partial_delivery_point;
 788                         }
 789                         if (sctp_is_all_msg_on_reasm(asoc, &tsize) || (tsize >= pd_point)) {
 790                                 /*
 791                                  * Yes, we setup to start reception, by
 792                                  * backing down the TSN just in case we
 793                                  * can't deliver. If we
 794                                  */
 795                                 asoc->fragmented_delivery_inprogress = 1;
 796                                 asoc->tsn_last_delivered =
 797                                     chk->rec.data.TSN_seq - 1;
 798                                 asoc->str_of_pdapi =
 799                                     chk->rec.data.stream_number;
 800                                 asoc->ssn_of_pdapi = chk->rec.data.stream_seq;
 801                                 asoc->pdapi_ppid = chk->rec.data.payloadtype;
 802                                 asoc->fragment_flags = chk->rec.data.rcv_flags;
 803                                 sctp_service_reassembly(stcb, asoc);
 804                         }
 805                 }
 806         } else {
 807                 /*
 808                  * Service re-assembly will deliver stream data queued at
 809                  * the end of fragmented delivery.. but it wont know to go
 810                  * back and call itself again... we do that here with the
 811                  * got doit_again
 812                  */
 813                 sctp_service_reassembly(stcb, asoc);
 814                 if (asoc->fragmented_delivery_inprogress == 0) {
 815                         /*
 816                          * finished our Fragmented delivery, could be more
 817                          * waiting?
 818                          */
 819                         goto doit_again;
 820                 }
 821         }
 822 }
 823
 824 /*
 825  * Dump onto the re-assembly queue, in its proper place. After dumping on the
 826  * queue, see if anthing can be delivered. If so pull it off (or as much as
 827  * we can. If we run out of space then we must dump what we can and set the
 828  * appropriate flag to say we queued what we could.
 829  */
 830 static void
 831 sctp_queue_data_for_reasm(struct sctp_tcb *stcb, struct sctp_association *asoc,
 832     struct sctp_tmit_chunk *chk, int *abort_flag)
 833 {
 834         struct mbuf *op_err;
 835         char msg[SCTP_DIAG_INFO_LEN];
 836         uint32_t cum_ackp1, prev_tsn, post_tsn;
 837         struct sctp_tmit_chunk *at, *prev, *next;
 838
 839         prev = next = NULL;
 840         cum_ackp1 = asoc->tsn_last_delivered + 1;
 841         if (TAILQ_EMPTY(&asoc->reasmqueue)) {
 842                 /* This is the first one on the queue */
 843                 TAILQ_INSERT_HEAD(&asoc->reasmqueue, chk, sctp_next);
 844                 /*
 845                  * we do not check for delivery of anything when only one
 846                  * fragment is here
 847                  */
 848                 asoc->size_on_reasm_queue = chk->send_size;
 849                 sctp_ucount_incr(asoc->cnt_on_reasm_queue);
 850                 if (chk->rec.data.TSN_seq == cum_ackp1) {
 851                         if (asoc->fragmented_delivery_inprogress == 0 &&
 852                             (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) !=
 853                             SCTP_DATA_FIRST_FRAG) {
 854                                 /*
 855                                  * An empty queue, no delivery inprogress,
 856                                  * we hit the next one and it does NOT have
 857                                  * a FIRST fragment mark.
 858                                  */
 859                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, its not first, no fragmented delivery in progress\n");
 860                                 snprintf(msg, sizeof(msg),
 861                                     "Expected B-bit for TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
 862                                     chk->rec.data.TSN_seq,
 863                                     chk->rec.data.stream_number,
 864                                     chk->rec.data.stream_seq);
 865                                 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
 866                                 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_2;
 867                                 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
 868                                 *abort_flag = 1;
 869                         } else if (asoc->fragmented_delivery_inprogress &&
 870                             (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == SCTP_DATA_FIRST_FRAG) {
 871                                 /*
 872                                  * We are doing a partial delivery and the
 873                                  * NEXT chunk MUST be either the LAST or
 874                                  * MIDDLE fragment NOT a FIRST
 875                                  */
 876                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it IS a first and fragmented delivery in progress\n");
 877                                 snprintf(msg, sizeof(msg),
 878                                     "Didn't expect B-bit for TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
 879                                     chk->rec.data.TSN_seq,
 880                                     chk->rec.data.stream_number,
 881                                     chk->rec.data.stream_seq);
 882                                 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
 883                                 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_3;
 884                                 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
 885                                 *abort_flag = 1;
 886                         } else if (asoc->fragmented_delivery_inprogress) {
 887                                 /*
 888                                  * Here we are ok with a MIDDLE or LAST
 889                                  * piece
 890                                  */
 891                                 if (chk->rec.data.stream_number !=
 892                                     asoc->str_of_pdapi) {
 893                                         /* Got to be the right STR No */
 894                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it IS not same stream number %d vs %d\n",
 895                                             chk->rec.data.stream_number,
 896                                             asoc->str_of_pdapi);
 897                                         snprintf(msg, sizeof(msg),
 898                                             "Expected SID=%4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
 899                                             asoc->str_of_pdapi,
 900                                             chk->rec.data.TSN_seq,
 901                                             chk->rec.data.stream_number,
 902                                             chk->rec.data.stream_seq);
 903                                         op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
 904                                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_4;
 905                                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
 906                                         *abort_flag = 1;
 907                                 } else if ((asoc->fragment_flags & SCTP_DATA_UNORDERED) !=
 908                                             SCTP_DATA_UNORDERED &&
 909                                     chk->rec.data.stream_seq != asoc->ssn_of_pdapi) {
 910                                         /* Got to be the right STR Seq */
 911                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it IS not same stream seq %d vs %d\n",
 912                                             chk->rec.data.stream_seq,
 913                                             asoc->ssn_of_pdapi);
 914                                         snprintf(msg, sizeof(msg),
 915                                             "Expected SSN=%4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
 916                                             asoc->ssn_of_pdapi,
 917                                             chk->rec.data.TSN_seq,
 918                                             chk->rec.data.stream_number,
 919                                             chk->rec.data.stream_seq);
 920                                         op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
 921                                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_5;
 922                                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
 923                                         *abort_flag = 1;
 924                                 }
 925                         }
 926                 }
 927                 return;
 928         }
 929         /* Find its place */
 930         TAILQ_FOREACH(at, &asoc->reasmqueue, sctp_next) {
 931                 if (SCTP_TSN_GT(at->rec.data.TSN_seq, chk->rec.data.TSN_seq)) {
 932                         /*
 933                          * one in queue is bigger than the new one, insert
 934                          * before this one
 935                          */
 936                         /* A check */
 937                         asoc->size_on_reasm_queue += chk->send_size;
 938                         sctp_ucount_incr(asoc->cnt_on_reasm_queue);
 939                         next = at;
 940                         TAILQ_INSERT_BEFORE(at, chk, sctp_next);
 941                         break;
 942                 } else if (at->rec.data.TSN_seq == chk->rec.data.TSN_seq) {
 943                         /* Gak, He sent me a duplicate str seq number */
 944                         /*
 945                          * foo bar, I guess I will just free this new guy,
 946                          * should we abort too? FIX ME MAYBE? Or it COULD be
 947                          * that the SSN's have wrapped. Maybe I should
 948                          * compare to TSN somehow... sigh for now just blow
 949                          * away the chunk!
 950                          */
 951                         if (chk->data) {
 952                                 sctp_m_freem(chk->data);
 953                                 chk->data = NULL;
 954                         }
 955                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 956                         return;
 957                 } else {
 958                         prev = at;
 959                         if (TAILQ_NEXT(at, sctp_next) == NULL) {
 960                                 /*
 961                                  * We are at the end, insert it after this
 962                                  * one
 963                                  */
 964                                 /* check it first */
 965                                 asoc->size_on_reasm_queue += chk->send_size;
 966                                 sctp_ucount_incr(asoc->cnt_on_reasm_queue);
 967                                 TAILQ_INSERT_AFTER(&asoc->reasmqueue, at, chk, sctp_next);
 968                                 break;
 969                         }
 970                 }
 971         }
 972         /* Now the audits */
 973         if (prev) {
 974                 prev_tsn = chk->rec.data.TSN_seq - 1;
 975                 if (prev_tsn == prev->rec.data.TSN_seq) {
 976                         /*
 977                          * Ok the one I am dropping onto the end is the
 978                          * NEXT. A bit of valdiation here.
 979                          */
 980                         if ((prev->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
 981                             SCTP_DATA_FIRST_FRAG ||
 982                             (prev->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
 983                             SCTP_DATA_MIDDLE_FRAG) {
 984                                 /*
 985                                  * Insert chk MUST be a MIDDLE or LAST
 986                                  * fragment
 987                                  */
 988                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
 989                                     SCTP_DATA_FIRST_FRAG) {
 990                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - It can be a midlle or last but not a first\n");
 991                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it's a FIRST!\n");
 992                                         snprintf(msg, sizeof(msg),
 993                                             "Can't handle B-bit, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
 994                                             chk->rec.data.TSN_seq,
 995                                             chk->rec.data.stream_number,
 996                                             chk->rec.data.stream_seq);
 997                                         op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
 998                                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_6;
 999                                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
1000                                         *abort_flag = 1;
1001                                         return;
1002                                 }
1003                                 if (chk->rec.data.stream_number !=
1004                                     prev->rec.data.stream_number) {
1005                                         /*
1006                                          * Huh, need the correct STR here,
1007                                          * they must be the same.
1008                                          */
1009                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - Gak, Evil plot, sid:%d not the same as at:%d\n",
1010                                             chk->rec.data.stream_number,
1011                                             prev->rec.data.stream_number);
1012                                         snprintf(msg, sizeof(msg),
1013                                             "Expect SID=%4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
1014                                             prev->rec.data.stream_number,
1015                                             chk->rec.data.TSN_seq,
1016                                             chk->rec.data.stream_number,
1017                                             chk->rec.data.stream_seq);
1018                                         op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
1019                                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_7;
1020                                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
1021                                         *abort_flag = 1;
1022                                         return;
1023                                 }
1024                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) !=
1025                                     (prev->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
1026                                         /*
1027                                          * Huh, need the same ordering here,
1028                                          * they must be the same.
1029                                          */
1030                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - Gak, Evil plot, U-bit not constant\n");
1031                                         snprintf(msg, sizeof(msg),
1032                                             "Expect U-bit=%d for TSN=%8.8x, got U-bit=%d",
1033                                             (prev->rec.data.rcv_flags & SCTP_DATA_UNORDERED) ? 1 : 0,
1034                                             chk->rec.data.TSN_seq,
1035                                             (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) ? 1 : 0);
1036                                         op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
1037                                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_8;
1038                                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
1039                                         *abort_flag = 1;
1040                                         return;
1041                                 }
1042                                 if ((prev->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0 &&
1043                                     chk->rec.data.stream_seq !=
1044                                     prev->rec.data.stream_seq) {
1045                                         /*
1046                                          * Huh, need the correct STR here,
1047                                          * they must be the same.
1048                                          */
1049                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - Gak, Evil plot, sseq:%d not the same as at:%d\n",
1050                                             chk->rec.data.stream_seq,
1051                                             prev->rec.data.stream_seq);
1052                                         snprintf(msg, sizeof(msg),
1053                                             "Expect SSN=%4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
1054                                             prev->rec.data.stream_seq,
1055                                             chk->rec.data.TSN_seq,
1056                                             chk->rec.data.stream_number,
1057                                             chk->rec.data.stream_seq);
1058                                         op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
1059                                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_9;
1060                                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
1061                                         *abort_flag = 1;
1062                                         return;
1063                                 }
1064                         } else if ((prev->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
1065                             SCTP_DATA_LAST_FRAG) {
1066                                 /* Insert chk MUST be a FIRST */
1067                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) !=
1068                                     SCTP_DATA_FIRST_FRAG) {
1069                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - Gak, evil plot, its not FIRST and it must be!\n");
1070                                         snprintf(msg, sizeof(msg),
1071                                             "Expect B-bit, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
1072                                             chk->rec.data.TSN_seq,
1073                                             chk->rec.data.stream_number,
1074                                             chk->rec.data.stream_seq);
1075                                         op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
1076                                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_10;
1077                                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
1078                                         *abort_flag = 1;
1079                                         return;
1080                                 }
1081                         }
1082                 }
1083         }
1084         if (next) {
1085                 post_tsn = chk->rec.data.TSN_seq + 1;
1086                 if (post_tsn == next->rec.data.TSN_seq) {
1087                         /*
1088                          * Ok the one I am inserting ahead of is my NEXT
1089                          * one. A bit of valdiation here.
1090                          */
1091                         if (next->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) {
1092                                 /* Insert chk MUST be a last fragment */
1093                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK)
1094                                     != SCTP_DATA_LAST_FRAG) {
1095                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Next is FIRST, we must be LAST\n");
1096                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, its not a last!\n");
1097                                         snprintf(msg, sizeof(msg),
1098                                             "Expect only E-bit, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
1099                                             chk->rec.data.TSN_seq,
1100                                             chk->rec.data.stream_number,
1101                                             chk->rec.data.stream_seq);
1102                                         op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
1103                                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_11;
1104                                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
1105                                         *abort_flag = 1;
1106                                         return;
1107                                 }
1108                         } else if ((next->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
1109                                     SCTP_DATA_MIDDLE_FRAG ||
1110                                     (next->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
1111                             SCTP_DATA_LAST_FRAG) {
1112                                 /*
1113                                  * Insert chk CAN be MIDDLE or FIRST NOT
1114                                  * LAST
1115                                  */
1116                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
1117                                     SCTP_DATA_LAST_FRAG) {
1118                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Next is a MIDDLE/LAST\n");
1119                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, new prev chunk is a LAST\n");
1120                                         snprintf(msg, sizeof(msg),
1121                                             "Didn't expect E-bit, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
1122                                             chk->rec.data.TSN_seq,
1123                                             chk->rec.data.stream_number,
1124                                             chk->rec.data.stream_seq);
1125                                         op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
1126                                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_12;
1127                                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
1128                                         *abort_flag = 1;
1129                                         return;
1130                                 }
1131                                 if (chk->rec.data.stream_number !=
1132                                     next->rec.data.stream_number) {
1133                                         /*
1134                                          * Huh, need the correct STR here,
1135                                          * they must be the same.
1136                                          */
1137                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Gak, Evil plot, ssn:%d not the same as at:%d\n",
1138                                             chk->rec.data.stream_number,
1139                                             next->rec.data.stream_number);
1140                                         snprintf(msg, sizeof(msg),
1141                                             "Required SID %4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
1142                                             next->rec.data.stream_number,
1143                                             chk->rec.data.TSN_seq,
1144                                             chk->rec.data.stream_number,
1145                                             chk->rec.data.stream_seq);
1146                                         op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
1147                                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_13;
1148                                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
1149                                         *abort_flag = 1;
1150                                         return;
1151                                 }
1152                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) !=
1153                                     (next->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
1154                                         /*
1155                                          * Huh, need the same ordering here,
1156                                          * they must be the same.
1157                                          */
1158                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Next check - Gak, Evil plot, U-bit not constant\n");
1159                                         snprintf(msg, sizeof(msg),
1160                                             "Expect U-bit=%d for TSN=%8.8x, got U-bit=%d",
1161                                             (next->rec.data.rcv_flags & SCTP_DATA_UNORDERED) ? 1 : 0,
1162                                             chk->rec.data.TSN_seq,
1163                                             (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) ? 1 : 0);
1164                                         op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
1165                                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_14;
1166                                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
1167                                         *abort_flag = 1;
1168                                         return;
1169                                 }
1170                                 if ((next->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0 &&
1171                                     chk->rec.data.stream_seq !=
1172                                     next->rec.data.stream_seq) {
1173                                         /*
1174                                          * Huh, need the correct STR here,
1175                                          * they must be the same.
1176                                          */
1177                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Gak, Evil plot, sseq:%d not the same as at:%d\n",
1178                                             chk->rec.data.stream_seq,
1179                                             next->rec.data.stream_seq);
1180                                         snprintf(msg, sizeof(msg),
1181                                             "Required SSN %4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
1182                                             next->rec.data.stream_seq,
1183                                             chk->rec.data.TSN_seq,
1184                                             chk->rec.data.stream_number,
1185                                             chk->rec.data.stream_seq);
1186                                         op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
1187                                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_15;
1188                                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
1189                                         *abort_flag = 1;
1190                                         return;
1191                                 }
1192                         }
1193                 }
1194         }
1195         /* Do we need to do some delivery? check */
1196         sctp_deliver_reasm_check(stcb, asoc);
1197 }
1198
1199 /*
1200  * This is an unfortunate routine. It checks to make sure a evil guy is not
1201  * stuffing us full of bad packet fragments. A broken peer could also do this
1202  * but this is doubtful. It is to bad I must worry about evil crackers sigh
1203  * :< more cycles.
1204  */
1205 static int
1206 sctp_does_tsn_belong_to_reasm(struct sctp_association *asoc,
1207     uint32_t TSN_seq)
1208 {
1209         struct sctp_tmit_chunk *at;
1210         uint32_t tsn_est;
1211
1212         TAILQ_FOREACH(at, &asoc->reasmqueue, sctp_next) {
1213                 if (SCTP_TSN_GT(TSN_seq, at->rec.data.TSN_seq)) {
1214                         /* is it one bigger? */
1215                         tsn_est = at->rec.data.TSN_seq + 1;
1216                         if (tsn_est == TSN_seq) {
1217                                 /* yep. It better be a last then */
1218                                 if ((at->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) !=
1219                                     SCTP_DATA_LAST_FRAG) {
1220                                         /*
1221                                          * Ok this guy belongs next to a guy
1222                                          * that is NOT last, it should be a
1223                                          * middle/last, not a complete
1224                                          * chunk.
1225                                          */
1226                                         return (1);
1227                                 } else {
1228                                         /*
1229                                          * This guy is ok since its a LAST
1230                                          * and the new chunk is a fully
1231                                          * self- contained one.
1232                                          */
1233                                         return (0);
1234                                 }
1235                         }
1236                 } else if (TSN_seq == at->rec.data.TSN_seq) {
1237                         /* Software error since I have a dup? */
1238                         return (1);
1239                 } else {
1240                         /*
1241                          * Ok, 'at' is larger than new chunk but does it
1242                          * need to be right before it.
1243                          */
1244                         tsn_est = TSN_seq + 1;
1245                         if (tsn_est == at->rec.data.TSN_seq) {
1246                                 /* Yep, It better be a first */
1247                                 if ((at->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) !=
1248                                     SCTP_DATA_FIRST_FRAG) {
1249                                         return (1);
1250                                 } else {
1251                                         return (0);
1252                                 }
1253                         }
1254                 }
1255         }
1256         return (0);
1257 }
1258
1259 static int
1260 sctp_process_a_data_chunk(struct sctp_tcb *stcb, struct sctp_association *asoc,
1261     struct mbuf **m, int offset, struct sctp_data_chunk *ch, int chk_length,
1262     struct sctp_nets *net, uint32_t * high_tsn, int *abort_flag,
1263     int *break_flag, int last_chunk)
1264 {
1265         /* Process a data chunk */
1266         /* struct sctp_tmit_chunk *chk; */
1267         struct sctp_tmit_chunk *chk;
1268         uint32_t tsn, gap;
1269         struct mbuf *dmbuf;
1270         int the_len;
1271         int need_reasm_check = 0;
1272         uint16_t strmno, strmseq;
1273         struct mbuf *op_err;
1274         char msg[SCTP_DIAG_INFO_LEN];
1275         struct sctp_queued_to_read *control;
1276         int ordered;
1277         uint32_t protocol_id;
1278         uint8_t chunk_flags;
1279         struct sctp_stream_reset_list *liste;
1280
1281         chk = NULL;
1282         tsn = ntohl(ch->dp.tsn);
1283         chunk_flags = ch->ch.chunk_flags;
1284         if ((chunk_flags & SCTP_DATA_SACK_IMMEDIATELY) == SCTP_DATA_SACK_IMMEDIATELY) {
1285                 asoc->send_sack = 1;
1286         }
1287         protocol_id = ch->dp.protocol_id;
1288         ordered = ((chunk_flags & SCTP_DATA_UNORDERED) == 0);
1289         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
1290                 sctp_log_map(tsn, asoc->cumulative_tsn, asoc->highest_tsn_inside_map, SCTP_MAP_TSN_ENTERS);
1291         }
1292         if (stcb == NULL) {
1293                 return (0);
1294         }
1295         SCTP_LTRACE_CHK(stcb->sctp_ep, stcb, ch->ch.chunk_type, tsn);
1296         if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
1297                 /* It is a duplicate */
1298                 SCTP_STAT_INCR(sctps_recvdupdata);
1299                 if (asoc->numduptsns < SCTP_MAX_DUP_TSNS) {
1300                         /* Record a dup for the next outbound sack */
1301                         asoc->dup_tsns[asoc->numduptsns] = tsn;
1302                         asoc->numduptsns++;
1303                 }
1304                 asoc->send_sack = 1;
1305                 return (0);
1306         }
1307         /* Calculate the number of TSN's between the base and this TSN */
1308         SCTP_CALC_TSN_TO_GAP(gap, tsn, asoc->mapping_array_base_tsn);
1309         if (gap >= (SCTP_MAPPING_ARRAY << 3)) {
1310                 /* Can't hold the bit in the mapping at max array, toss it */
1311                 return (0);
1312         }
1313         if (gap >= (uint32_t) (asoc->mapping_array_size << 3)) {
1314                 SCTP_TCB_LOCK_ASSERT(stcb);
1315                 if (sctp_expand_mapping_array(asoc, gap)) {
1316                         /* Can't expand, drop it */
1317                         return (0);
1318                 }
1319         }
1320         if (SCTP_TSN_GT(tsn, *high_tsn)) {
1321                 *high_tsn = tsn;
1322         }
1323         /* See if we have received this one already */
1324         if (SCTP_IS_TSN_PRESENT(asoc->mapping_array, gap) ||
1325             SCTP_IS_TSN_PRESENT(asoc->nr_mapping_array, gap)) {
1326                 SCTP_STAT_INCR(sctps_recvdupdata);
1327                 if (asoc->numduptsns < SCTP_MAX_DUP_TSNS) {
1328                         /* Record a dup for the next outbound sack */
1329                         asoc->dup_tsns[asoc->numduptsns] = tsn;
1330                         asoc->numduptsns++;
1331                 }
1332                 asoc->send_sack = 1;
1333                 return (0);
1334         }
1335         /*
1336          * Check to see about the GONE flag, duplicates would cause a sack
1337          * to be sent up above
1338          */
1339         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
1340             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
1341             (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET))) {
1342                 /*
1343                  * wait a minute, this guy is gone, there is no longer a
1344                  * receiver. Send peer an ABORT!
1345                  */
1346                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
1347                 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
1348                 *abort_flag = 1;
1349                 return (0);
1350         }
1351         /*
1352          * Now before going further we see if there is room. If NOT then we
1353          * MAY let one through only IF this TSN is the one we are waiting
1354          * for on a partial delivery API.
1355          */
1356
1357         /* now do the tests */
1358         if (((asoc->cnt_on_all_streams +
1359             asoc->cnt_on_reasm_queue +
1360             asoc->cnt_msg_on_sb) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue)) ||
1361             (((int)asoc->my_rwnd) <= 0)) {
1362                 /*
1363                  * When we have NO room in the rwnd we check to make sure
1364                  * the reader is doing its job...
1365                  */
1366                 if (stcb->sctp_socket->so_rcv.sb_cc) {
1367                         /* some to read, wake-up */
1368 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1369                         struct socket *so;
1370
1371                         so = SCTP_INP_SO(stcb->sctp_ep);
1372                         atomic_add_int(&stcb->asoc.refcnt, 1);
1373                         SCTP_TCB_UNLOCK(stcb);
1374                         SCTP_SOCKET_LOCK(so, 1);
1375                         SCTP_TCB_LOCK(stcb);
1376                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1377                         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1378                                 /* assoc was freed while we were unlocked */
1379                                 SCTP_SOCKET_UNLOCK(so, 1);
1380                                 return (0);
1381                         }
1382 #endif
1383                         sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
1384 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1385                         SCTP_SOCKET_UNLOCK(so, 1);
1386 #endif
1387                 }
1388                 /* now is it in the mapping array of what we have accepted? */
1389                 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_map) &&
1390                     SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) {
1391                         /* Nope not in the valid range dump it */
1392                         sctp_set_rwnd(stcb, asoc);
1393                         if ((asoc->cnt_on_all_streams +
1394                             asoc->cnt_on_reasm_queue +
1395                             asoc->cnt_msg_on_sb) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue)) {
1396                                 SCTP_STAT_INCR(sctps_datadropchklmt);
1397                         } else {
1398                                 SCTP_STAT_INCR(sctps_datadroprwnd);
1399                         }
1400                         *break_flag = 1;
1401                         return (0);
1402                 }
1403         }
1404         strmno = ntohs(ch->dp.stream_id);
1405         if (strmno >= asoc->streamincnt) {
1406                 struct sctp_paramhdr *phdr;
1407                 struct mbuf *mb;
1408
1409                 mb = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) * 2),
1410                     0, M_NOWAIT, 1, MT_DATA);
1411                 if (mb != NULL) {
1412                         /* add some space up front so prepend will work well */
1413                         SCTP_BUF_RESV_UF(mb, sizeof(struct sctp_chunkhdr));
1414                         phdr = mtod(mb, struct sctp_paramhdr *);
1415                         /*
1416                          * Error causes are just param's and this one has
1417                          * two back to back phdr, one with the error type
1418                          * and size, the other with the streamid and a rsvd
1419                          */
1420                         SCTP_BUF_LEN(mb) = (sizeof(struct sctp_paramhdr) * 2);
1421                         phdr->param_type = htons(SCTP_CAUSE_INVALID_STREAM);
1422                         phdr->param_length =
1423                             htons(sizeof(struct sctp_paramhdr) * 2);
1424                         phdr++;
1425                         /* We insert the stream in the type field */
1426                         phdr->param_type = ch->dp.stream_id;
1427                         /* And set the length to 0 for the rsvd field */
1428                         phdr->param_length = 0;
1429                         sctp_queue_op_err(stcb, mb);
1430                 }
1431                 SCTP_STAT_INCR(sctps_badsid);
1432                 SCTP_TCB_LOCK_ASSERT(stcb);
1433                 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap);
1434                 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) {
1435                         asoc->highest_tsn_inside_nr_map = tsn;
1436                 }
1437                 if (tsn == (asoc->cumulative_tsn + 1)) {
1438                         /* Update cum-ack */
1439                         asoc->cumulative_tsn = tsn;
1440                 }
1441                 return (0);
1442         }
1443         /*
1444          * Before we continue lets validate that we are not being fooled by
1445          * an evil attacker. We can only have 4k chunks based on our TSN
1446          * spread allowed by the mapping array 512 * 8 bits, so there is no
1447          * way our stream sequence numbers could have wrapped. We of course
1448          * only validate the FIRST fragment so the bit must be set.
1449          */
1450         strmseq = ntohs(ch->dp.stream_sequence);
1451 #ifdef SCTP_ASOCLOG_OF_TSNS
1452         SCTP_TCB_LOCK_ASSERT(stcb);
1453         if (asoc->tsn_in_at >= SCTP_TSN_LOG_SIZE) {
1454                 asoc->tsn_in_at = 0;
1455                 asoc->tsn_in_wrapped = 1;
1456         }
1457         asoc->in_tsnlog[asoc->tsn_in_at].tsn = tsn;
1458         asoc->in_tsnlog[asoc->tsn_in_at].strm = strmno;
1459         asoc->in_tsnlog[asoc->tsn_in_at].seq = strmseq;
1460         asoc->in_tsnlog[asoc->tsn_in_at].sz = chk_length;
1461         asoc->in_tsnlog[asoc->tsn_in_at].flgs = chunk_flags;
1462         asoc->in_tsnlog[asoc->tsn_in_at].stcb = (void *)stcb;
1463         asoc->in_tsnlog[asoc->tsn_in_at].in_pos = asoc->tsn_in_at;
1464         asoc->in_tsnlog[asoc->tsn_in_at].in_out = 1;
1465         asoc->tsn_in_at++;
1466 #endif
1467         if ((chunk_flags & SCTP_DATA_FIRST_FRAG) &&
1468             (TAILQ_EMPTY(&asoc->resetHead)) &&
1469             (chunk_flags & SCTP_DATA_UNORDERED) == 0 &&
1470             SCTP_SSN_GE(asoc->strmin[strmno].last_sequence_delivered, strmseq)) {
1471                 /* The incoming sseq is behind where we last delivered? */
1472                 SCTPDBG(SCTP_DEBUG_INDATA1, "EVIL/Broken-Dup S-SEQ:%d delivered:%d from peer, Abort!\n",
1473                     strmseq, asoc->strmin[strmno].last_sequence_delivered);
1474
1475                 snprintf(msg, sizeof(msg), "Delivered SSN=%4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
1476                     asoc->strmin[strmno].last_sequence_delivered,
1477                     tsn, strmno, strmseq);
1478                 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
1479                 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_16;
1480                 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
1481                 *abort_flag = 1;
1482                 return (0);
1483         }
1484         /************************************
1485          * From here down we may find ch-> invalid
1486          * so its a good idea NOT to use it.
1487          *************************************/
1488
1489         the_len = (chk_length - sizeof(struct sctp_data_chunk));
1490         if (last_chunk == 0) {
1491                 dmbuf = SCTP_M_COPYM(*m,
1492                     (offset + sizeof(struct sctp_data_chunk)),
1493                     the_len, M_NOWAIT);
1494 #ifdef SCTP_MBUF_LOGGING
1495                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
1496                         sctp_log_mbc(dmbuf, SCTP_MBUF_ICOPY);
1497                 }
1498 #endif
1499         } else {
1500                 /* We can steal the last chunk */
1501                 int l_len;
1502
1503                 dmbuf = *m;
1504                 /* lop off the top part */
1505                 m_adj(dmbuf, (offset + sizeof(struct sctp_data_chunk)));
1506                 if (SCTP_BUF_NEXT(dmbuf) == NULL) {
1507                         l_len = SCTP_BUF_LEN(dmbuf);
1508                 } else {
1509                         /*
1510                          * need to count up the size hopefully does not hit
1511                          * this to often :-0
1512                          */
1513                         struct mbuf *lat;
1514
1515                         l_len = 0;
1516                         for (lat = dmbuf; lat; lat = SCTP_BUF_NEXT(lat)) {
1517                                 l_len += SCTP_BUF_LEN(lat);
1518                         }
1519                 }
1520                 if (l_len > the_len) {
1521                         /* Trim the end round bytes off  too */
1522                         m_adj(dmbuf, -(l_len - the_len));
1523                 }
1524         }
1525         if (dmbuf == NULL) {
1526                 SCTP_STAT_INCR(sctps_nomem);
1527                 return (0);
1528         }
1529         if ((chunk_flags & SCTP_DATA_NOT_FRAG) == SCTP_DATA_NOT_FRAG &&
1530             asoc->fragmented_delivery_inprogress == 0 &&
1531             TAILQ_EMPTY(&asoc->resetHead) &&
1532             ((ordered == 0) ||
1533             ((uint16_t) (asoc->strmin[strmno].last_sequence_delivered + 1) == strmseq &&
1534             TAILQ_EMPTY(&asoc->strmin[strmno].inqueue)))) {
1535                 /* Candidate for express delivery */
1536                 /*
1537                  * Its not fragmented, No PD-API is up, Nothing in the
1538                  * delivery queue, Its un-ordered OR ordered and the next to
1539                  * deliver AND nothing else is stuck on the stream queue,
1540                  * And there is room for it in the socket buffer. Lets just
1541                  * stuff it up the buffer....
1542                  */
1543
1544                 /* It would be nice to avoid this copy if we could :< */
1545                 sctp_alloc_a_readq(stcb, control);
1546                 sctp_build_readq_entry_mac(control, stcb, asoc->context, net, tsn,
1547                     protocol_id,
1548                     strmno, strmseq,
1549                     chunk_flags,
1550                     dmbuf);
1551                 if (control == NULL) {
1552                         goto failed_express_del;
1553                 }
1554                 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap);
1555                 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) {
1556                         asoc->highest_tsn_inside_nr_map = tsn;
1557                 }
1558                 sctp_add_to_readq(stcb->sctp_ep, stcb,
1559                     control, &stcb->sctp_socket->so_rcv,
1560                     1, SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED);
1561
1562                 if ((chunk_flags & SCTP_DATA_UNORDERED) == 0) {
1563                         /* for ordered, bump what we delivered */
1564                         asoc->strmin[strmno].last_sequence_delivered++;
1565                 }
1566                 SCTP_STAT_INCR(sctps_recvexpress);
1567                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
1568                         sctp_log_strm_del_alt(stcb, tsn, strmseq, strmno,
1569                             SCTP_STR_LOG_FROM_EXPRS_DEL);
1570                 }
1571                 control = NULL;
1572
1573                 goto finish_express_del;
1574         }
1575 failed_express_del:
1576         /* If we reach here this is a new chunk */
1577         chk = NULL;
1578         control = NULL;
1579         /* Express for fragmented delivery? */
1580         if ((asoc->fragmented_delivery_inprogress) &&
1581             (stcb->asoc.control_pdapi) &&
1582             (asoc->str_of_pdapi == strmno) &&
1583             (asoc->ssn_of_pdapi == strmseq)
1584             ) {
1585                 control = stcb->asoc.control_pdapi;
1586                 if ((chunk_flags & SCTP_DATA_FIRST_FRAG) == SCTP_DATA_FIRST_FRAG) {
1587                         /* Can't be another first? */
1588                         goto failed_pdapi_express_del;
1589                 }
1590                 if (tsn == (control->sinfo_tsn + 1)) {
1591                         /* Yep, we can add it on */
1592                         int end = 0;
1593
1594                         if (chunk_flags & SCTP_DATA_LAST_FRAG) {
1595                                 end = 1;
1596                         }
1597                         if (sctp_append_to_readq(stcb->sctp_ep, stcb, control, dmbuf, end,
1598                             tsn,
1599                             &stcb->sctp_socket->so_rcv)) {
1600                                 SCTP_PRINTF("Append fails end:%d\n", end);
1601                                 goto failed_pdapi_express_del;
1602                         }
1603                         SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap);
1604                         if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) {
1605                                 asoc->highest_tsn_inside_nr_map = tsn;
1606                         }
1607                         SCTP_STAT_INCR(sctps_recvexpressm);
1608                         asoc->tsn_last_delivered = tsn;
1609                         asoc->fragment_flags = chunk_flags;
1610                         asoc->tsn_of_pdapi_last_delivered = tsn;
1611                         asoc->last_flags_delivered = chunk_flags;
1612                         asoc->last_strm_seq_delivered = strmseq;
1613                         asoc->last_strm_no_delivered = strmno;
1614                         if (end) {
1615                                 /* clean up the flags and such */
1616                                 asoc->fragmented_delivery_inprogress = 0;
1617                                 if ((chunk_flags & SCTP_DATA_UNORDERED) == 0) {
1618                                         asoc->strmin[strmno].last_sequence_delivered++;
1619                                 }
1620                                 stcb->asoc.control_pdapi = NULL;
1621                                 if (TAILQ_EMPTY(&asoc->reasmqueue) == 0) {
1622                                         /*
1623                                          * There could be another message
1624                                          * ready
1625                                          */
1626                                         need_reasm_check = 1;
1627                                 }
1628                         }
1629                         control = NULL;
1630                         goto finish_express_del;
1631                 }
1632         }
1633 failed_pdapi_express_del:
1634         control = NULL;
1635         if (SCTP_BASE_SYSCTL(sctp_do_drain) == 0) {
1636                 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap);
1637                 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) {
1638                         asoc->highest_tsn_inside_nr_map = tsn;
1639                 }
1640         } else {
1641                 SCTP_SET_TSN_PRESENT(asoc->mapping_array, gap);
1642                 if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_map)) {
1643                         asoc->highest_tsn_inside_map = tsn;
1644                 }
1645         }
1646         if ((chunk_flags & SCTP_DATA_NOT_FRAG) != SCTP_DATA_NOT_FRAG) {
1647                 sctp_alloc_a_chunk(stcb, chk);
1648                 if (chk == NULL) {
1649                         /* No memory so we drop the chunk */
1650                         SCTP_STAT_INCR(sctps_nomem);
1651                         if (last_chunk == 0) {
1652                                 /* we copied it, free the copy */
1653                                 sctp_m_freem(dmbuf);
1654                         }
1655                         return (0);
1656                 }
1657                 chk->rec.data.TSN_seq = tsn;
1658                 chk->no_fr_allowed = 0;
1659                 chk->rec.data.stream_seq = strmseq;
1660                 chk->rec.data.stream_number = strmno;
1661                 chk->rec.data.payloadtype = protocol_id;
1662                 chk->rec.data.context = stcb->asoc.context;
1663                 chk->rec.data.doing_fast_retransmit = 0;
1664                 chk->rec.data.rcv_flags = chunk_flags;
1665                 chk->asoc = asoc;
1666                 chk->send_size = the_len;
1667                 chk->whoTo = net;
1668                 atomic_add_int(&net->ref_count, 1);
1669                 chk->data = dmbuf;
1670         } else {
1671                 sctp_alloc_a_readq(stcb, control);
1672                 sctp_build_readq_entry_mac(control, stcb, asoc->context, net, tsn,
1673                     protocol_id,
1674                     strmno, strmseq,
1675                     chunk_flags,
1676                     dmbuf);
1677                 if (control == NULL) {
1678                         /* No memory so we drop the chunk */
1679                         SCTP_STAT_INCR(sctps_nomem);
1680                         if (last_chunk == 0) {
1681                                 /* we copied it, free the copy */
1682                                 sctp_m_freem(dmbuf);
1683                         }
1684                         return (0);
1685                 }
1686                 control->length = the_len;
1687         }
1688
1689         /* Mark it as received */
1690         /* Now queue it where it belongs */
1691         if (control != NULL) {
1692                 /* First a sanity check */
1693                 if (asoc->fragmented_delivery_inprogress) {
1694                         /*
1695                          * Ok, we have a fragmented delivery in progress if
1696                          * this chunk is next to deliver OR belongs in our
1697                          * view to the reassembly, the peer is evil or
1698                          * broken.
1699                          */
1700                         uint32_t estimate_tsn;
1701
1702                         estimate_tsn = asoc->tsn_last_delivered + 1;
1703                         if (TAILQ_EMPTY(&asoc->reasmqueue) &&
1704                             (estimate_tsn == control->sinfo_tsn)) {
1705                                 /* Evil/Broke peer */
1706                                 sctp_m_freem(control->data);
1707                                 control->data = NULL;
1708                                 if (control->whoFrom) {
1709                                         sctp_free_remote_addr(control->whoFrom);
1710                                         control->whoFrom = NULL;
1711                                 }
1712                                 sctp_free_a_readq(stcb, control);
1713                                 snprintf(msg, sizeof(msg), "Reas. queue emtpy, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
1714                                     tsn, strmno, strmseq);
1715                                 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
1716                                 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_17;
1717                                 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
1718                                 *abort_flag = 1;
1719                                 if (last_chunk) {
1720                                         *m = NULL;
1721                                 }
1722                                 return (0);
1723                         } else {
1724                                 if (sctp_does_tsn_belong_to_reasm(asoc, control->sinfo_tsn)) {
1725                                         sctp_m_freem(control->data);
1726                                         control->data = NULL;
1727                                         if (control->whoFrom) {
1728                                                 sctp_free_remote_addr(control->whoFrom);
1729                                                 control->whoFrom = NULL;
1730                                         }
1731                                         sctp_free_a_readq(stcb, control);
1732                                         snprintf(msg, sizeof(msg), "PD ongoing, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
1733                                             tsn, strmno, strmseq);
1734                                         op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
1735                                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_18;
1736                                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
1737                                         *abort_flag = 1;
1738                                         if (last_chunk) {
1739                                                 *m = NULL;
1740                                         }
1741                                         return (0);
1742                                 }
1743                         }
1744                 } else {
1745                         /* No PDAPI running */
1746                         if (!TAILQ_EMPTY(&asoc->reasmqueue)) {
1747                                 /*
1748                                  * Reassembly queue is NOT empty validate
1749                                  * that this tsn does not need to be in
1750                                  * reasembly queue. If it does then our peer
1751                                  * is broken or evil.
1752                                  */
1753                                 if (sctp_does_tsn_belong_to_reasm(asoc, control->sinfo_tsn)) {
1754                                         sctp_m_freem(control->data);
1755                                         control->data = NULL;
1756                                         if (control->whoFrom) {
1757                                                 sctp_free_remote_addr(control->whoFrom);
1758                                                 control->whoFrom = NULL;
1759                                         }
1760                                         sctp_free_a_readq(stcb, control);
1761                                         snprintf(msg, sizeof(msg), "No PD ongoing, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
1762                                             tsn, strmno, strmseq);
1763                                         op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
1764                                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_19;
1765                                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
1766                                         *abort_flag = 1;
1767                                         if (last_chunk) {
1768                                                 *m = NULL;
1769                                         }
1770                                         return (0);
1771                                 }
1772                         }
1773                 }
1774                 /* ok, if we reach here we have passed the sanity checks */
1775                 if (chunk_flags & SCTP_DATA_UNORDERED) {
1776                         /* queue directly into socket buffer */
1777                         sctp_mark_non_revokable(asoc, control->sinfo_tsn);
1778                         sctp_add_to_readq(stcb->sctp_ep, stcb,
1779                             control,
1780                             &stcb->sctp_socket->so_rcv, 1, SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED);
1781                 } else {
1782                         /*
1783                          * Special check for when streams are resetting. We
1784                          * could be more smart about this and check the
1785                          * actual stream to see if it is not being reset..
1786                          * that way we would not create a HOLB when amongst
1787                          * streams being reset and those not being reset.
1788                          *
1789                          * We take complete messages that have a stream reset
1790                          * intervening (aka the TSN is after where our
1791                          * cum-ack needs to be) off and put them on a
1792                          * pending_reply_queue. The reassembly ones we do
1793                          * not have to worry about since they are all sorted
1794                          * and proceessed by TSN order. It is only the
1795                          * singletons I must worry about.
1796                          */
1797                         if (((liste = TAILQ_FIRST(&asoc->resetHead)) != NULL) &&
1798                             SCTP_TSN_GT(tsn, liste->tsn)) {
1799                                 /*
1800                                  * yep its past where we need to reset... go
1801                                  * ahead and queue it.
1802                                  */
1803                                 if (TAILQ_EMPTY(&asoc->pending_reply_queue)) {
1804                                         /* first one on */
1805                                         TAILQ_INSERT_TAIL(&asoc->pending_reply_queue, control, next);
1806                                 } else {
1807                                         struct sctp_queued_to_read *ctlOn,
1808                                                            *nctlOn;
1809                                         unsigned char inserted = 0;
1810
1811                                         TAILQ_FOREACH_SAFE(ctlOn, &asoc->pending_reply_queue, next, nctlOn) {
1812                                                 if (SCTP_TSN_GT(control->sinfo_tsn, ctlOn->sinfo_tsn)) {
1813                                                         continue;
1814                                                 } else {
1815                                                         /* found it */
1816                                                         TAILQ_INSERT_BEFORE(ctlOn, control, next);
1817                                                         inserted = 1;
1818                                                         break;
1819                                                 }
1820                                         }
1821                                         if (inserted == 0) {
1822                                                 /*
1823                                                  * must be put at end, use
1824                                                  * prevP (all setup from
1825                                                  * loop) to setup nextP.
1826                                                  */
1827                                                 TAILQ_INSERT_TAIL(&asoc->pending_reply_queue, control, next);
1828                                         }
1829                                 }
1830                         } else {
1831                                 sctp_queue_data_to_stream(stcb, asoc, control, abort_flag);
1832                                 if (*abort_flag) {
1833                                         if (last_chunk) {
1834                                                 *m = NULL;
1835                                         }
1836                                         return (0);
1837                                 }
1838                         }
1839                 }
1840         } else {
1841                 /* Into the re-assembly queue */
1842                 sctp_queue_data_for_reasm(stcb, asoc, chk, abort_flag);
1843                 if (*abort_flag) {
1844                         /*
1845                          * the assoc is now gone and chk was put onto the
1846                          * reasm queue, which has all been freed.
1847                          */
1848                         if (last_chunk) {
1849                                 *m = NULL;
1850                         }
1851                         return (0);
1852                 }
1853         }
1854 finish_express_del:
1855         if (tsn == (asoc->cumulative_tsn + 1)) {
1856                 /* Update cum-ack */
1857                 asoc->cumulative_tsn = tsn;
1858         }
1859         if (last_chunk) {
1860                 *m = NULL;
1861         }
1862         if (ordered) {
1863                 SCTP_STAT_INCR_COUNTER64(sctps_inorderchunks);
1864         } else {
1865                 SCTP_STAT_INCR_COUNTER64(sctps_inunorderchunks);
1866         }
1867         SCTP_STAT_INCR(sctps_recvdata);
1868         /* Set it present please */
1869         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
1870                 sctp_log_strm_del_alt(stcb, tsn, strmseq, strmno, SCTP_STR_LOG_FROM_MARK_TSN);
1871         }
1872         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
1873                 sctp_log_map(asoc->mapping_array_base_tsn, asoc->cumulative_tsn,
1874                     asoc->highest_tsn_inside_map, SCTP_MAP_PREPARE_SLIDE);
1875         }
1876         /* check the special flag for stream resets */
1877         if (((liste = TAILQ_FIRST(&asoc->resetHead)) != NULL) &&
1878             SCTP_TSN_GE(asoc->cumulative_tsn, liste->tsn)) {
1879                 /*
1880                  * we have finished working through the backlogged TSN's now
1881                  * time to reset streams. 1: call reset function. 2: free
1882                  * pending_reply space 3: distribute any chunks in
1883                  * pending_reply_queue.
1884                  */
1885                 struct sctp_queued_to_read *ctl, *nctl;
1886
1887                 sctp_reset_in_stream(stcb, liste->number_entries, liste->list_of_streams);
1888                 TAILQ_REMOVE(&asoc->resetHead, liste, next_resp);
1889                 sctp_send_deferred_reset_response(stcb, liste, SCTP_STREAM_RESET_RESULT_PERFORMED);
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,
2164                             SCTP_FROM_SCTP_INDATA + SCTP_LOC_20);
2165                 }
2166                 sctp_send_shutdown(stcb,
2167                     ((stcb->asoc.alternate) ? stcb->asoc.alternate : stcb->asoc.primary_destination));
2168                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
2169         } else {
2170                 int is_a_gap;
2171
2172                 /* is there a gap now ? */
2173                 is_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
2174
2175                 /*
2176                  * CMT DAC algorithm: increase number of packets received
2177                  * since last ack
2178                  */
2179                 stcb->asoc.cmt_dac_pkts_rcvd++;
2180
2181                 if ((stcb->asoc.send_sack == 1) ||      /* We need to send a
2182                                                          * SACK */
2183                     ((was_a_gap) && (is_a_gap == 0)) || /* was a gap, but no
2184                                                          * longer is one */
2185                     (stcb->asoc.numduptsns) ||  /* we have dup's */
2186                     (is_a_gap) ||       /* is still a gap */
2187                     (stcb->asoc.delayed_ack == 0) ||    /* Delayed sack disabled */
2188                     (stcb->asoc.data_pkts_seen >= stcb->asoc.sack_freq) /* hit limit of pkts */
2189                     ) {
2190
2191                         if ((stcb->asoc.sctp_cmt_on_off > 0) &&
2192                             (SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) &&
2193                             (stcb->asoc.send_sack == 0) &&
2194                             (stcb->asoc.numduptsns == 0) &&
2195                             (stcb->asoc.delayed_ack) &&
2196                             (!SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer))) {
2197
2198                                 /*
2199                                  * CMT DAC algorithm: With CMT, delay acks
2200                                  * even in the face of
2201                                  *
2202                                  * reordering. Therefore, if acks that do not
2203                                  * have to be sent because of the above
2204                                  * reasons, will be delayed. That is, acks
2205                                  * that would have been sent due to gap
2206                                  * reports will be delayed with DAC. Start
2207                                  * the delayed ack timer.
2208                                  */
2209                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
2210                                     stcb->sctp_ep, stcb, NULL);
2211                         } else {
2212                                 /*
2213                                  * Ok we must build a SACK since the timer
2214                                  * is pending, we got our first packet OR
2215                                  * there are gaps or duplicates.
2216                                  */
2217                                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
2218                                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
2219                         }
2220                 } else {
2221                         if (!SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
2222                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
2223                                     stcb->sctp_ep, stcb, NULL);
2224                         }
2225                 }
2226         }
2227 }
2228
2229 void
2230 sctp_service_queues(struct sctp_tcb *stcb, struct sctp_association *asoc)
2231 {
2232         struct sctp_tmit_chunk *chk;
2233         uint32_t tsize, pd_point;
2234         uint16_t nxt_todel;
2235
2236         if (asoc->fragmented_delivery_inprogress) {
2237                 sctp_service_reassembly(stcb, asoc);
2238         }
2239         /* Can we proceed further, i.e. the PD-API is complete */
2240         if (asoc->fragmented_delivery_inprogress) {
2241                 /* no */
2242                 return;
2243         }
2244         /*
2245          * Now is there some other chunk I can deliver from the reassembly
2246          * queue.
2247          */
2248 doit_again:
2249         chk = TAILQ_FIRST(&asoc->reasmqueue);
2250         if (chk == NULL) {
2251                 asoc->size_on_reasm_queue = 0;
2252                 asoc->cnt_on_reasm_queue = 0;
2253                 return;
2254         }
2255         nxt_todel = asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered + 1;
2256         if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) &&
2257             ((nxt_todel == chk->rec.data.stream_seq) ||
2258             (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED))) {
2259                 /*
2260                  * Yep the first one is here. We setup to start reception,
2261                  * by backing down the TSN just in case we can't deliver.
2262                  */
2263
2264                 /*
2265                  * Before we start though either all of the message should
2266                  * be here or the socket buffer max or nothing on the
2267                  * delivery queue and something can be delivered.
2268                  */
2269                 if (stcb->sctp_socket) {
2270                         pd_point = min(SCTP_SB_LIMIT_RCV(stcb->sctp_socket) >> SCTP_PARTIAL_DELIVERY_SHIFT,
2271                             stcb->sctp_ep->partial_delivery_point);
2272                 } else {
2273                         pd_point = stcb->sctp_ep->partial_delivery_point;
2274                 }
2275                 if (sctp_is_all_msg_on_reasm(asoc, &tsize) || (tsize >= pd_point)) {
2276                         asoc->fragmented_delivery_inprogress = 1;
2277                         asoc->tsn_last_delivered = chk->rec.data.TSN_seq - 1;
2278                         asoc->str_of_pdapi = chk->rec.data.stream_number;
2279                         asoc->ssn_of_pdapi = chk->rec.data.stream_seq;
2280                         asoc->pdapi_ppid = chk->rec.data.payloadtype;
2281                         asoc->fragment_flags = chk->rec.data.rcv_flags;
2282                         sctp_service_reassembly(stcb, asoc);
2283                         if (asoc->fragmented_delivery_inprogress == 0) {
2284                                 goto doit_again;
2285                         }
2286                 }
2287         }
2288 }
2289
2290 int
2291 sctp_process_data(struct mbuf **mm, int iphlen, int *offset, int length,
2292     struct sockaddr *src, struct sockaddr *dst,
2293     struct sctphdr *sh, struct sctp_inpcb *inp,
2294     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t * high_tsn,
2295     uint8_t mflowtype, uint32_t mflowid,
2296     uint32_t vrf_id, uint16_t port)
2297 {
2298         struct sctp_data_chunk *ch, chunk_buf;
2299         struct sctp_association *asoc;
2300         int num_chunks = 0;     /* number of control chunks processed */
2301         int stop_proc = 0;
2302         int chk_length, break_flag, last_chunk;
2303         int abort_flag = 0, was_a_gap;
2304         struct mbuf *m;
2305         uint32_t highest_tsn;
2306
2307         /* set the rwnd */
2308         sctp_set_rwnd(stcb, &stcb->asoc);
2309
2310         m = *mm;
2311         SCTP_TCB_LOCK_ASSERT(stcb);
2312         asoc = &stcb->asoc;
2313         if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->highest_tsn_inside_map)) {
2314                 highest_tsn = asoc->highest_tsn_inside_nr_map;
2315         } else {
2316                 highest_tsn = asoc->highest_tsn_inside_map;
2317         }
2318         was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
2319         /*
2320          * setup where we got the last DATA packet from for any SACK that
2321          * may need to go out. Don't bump the net. This is done ONLY when a
2322          * chunk is assigned.
2323          */
2324         asoc->last_data_chunk_from = net;
2325
2326         /*-
2327          * Now before we proceed we must figure out if this is a wasted
2328          * cluster... i.e. it is a small packet sent in and yet the driver
2329          * underneath allocated a full cluster for it. If so we must copy it
2330          * to a smaller mbuf and free up the cluster mbuf. This will help
2331          * with cluster starvation. Note for __Panda__ we don't do this
2332          * since it has clusters all the way down to 64 bytes.
2333          */
2334         if (SCTP_BUF_LEN(m) < (long)MLEN && SCTP_BUF_NEXT(m) == NULL) {
2335                 /* we only handle mbufs that are singletons.. not chains */
2336                 m = sctp_get_mbuf_for_msg(SCTP_BUF_LEN(m), 0, M_NOWAIT, 1, MT_DATA);
2337                 if (m) {
2338                         /* ok lets see if we can copy the data up */
2339                         caddr_t *from, *to;
2340
2341                         /* get the pointers and copy */
2342                         to = mtod(m, caddr_t *);
2343                         from = mtod((*mm), caddr_t *);
2344                         memcpy(to, from, SCTP_BUF_LEN((*mm)));
2345                         /* copy the length and free up the old */
2346                         SCTP_BUF_LEN(m) = SCTP_BUF_LEN((*mm));
2347                         sctp_m_freem(*mm);
2348                         /* sucess, back copy */
2349                         *mm = m;
2350                 } else {
2351                         /* We are in trouble in the mbuf world .. yikes */
2352                         m = *mm;
2353                 }
2354         }
2355         /* get pointer to the first chunk header */
2356         ch = (struct sctp_data_chunk *)sctp_m_getptr(m, *offset,
2357             sizeof(struct sctp_data_chunk), (uint8_t *) & chunk_buf);
2358         if (ch == NULL) {
2359                 return (1);
2360         }
2361         /*
2362          * process all DATA chunks...
2363          */
2364         *high_tsn = asoc->cumulative_tsn;
2365         break_flag = 0;
2366         asoc->data_pkts_seen++;
2367         while (stop_proc == 0) {
2368                 /* validate chunk length */
2369                 chk_length = ntohs(ch->ch.chunk_length);
2370                 if (length - *offset < chk_length) {
2371                         /* all done, mutulated chunk */
2372                         stop_proc = 1;
2373                         continue;
2374                 }
2375                 if (ch->ch.chunk_type == SCTP_DATA) {
2376                         if ((size_t)chk_length < sizeof(struct sctp_data_chunk)) {
2377                                 /*
2378                                  * Need to send an abort since we had a
2379                                  * invalid data chunk.
2380                                  */
2381                                 struct mbuf *op_err;
2382                                 char msg[SCTP_DIAG_INFO_LEN];
2383
2384                                 snprintf(msg, sizeof(msg), "DATA chunk of length %d",
2385                                     chk_length);
2386                                 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
2387                                 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_21;
2388                                 sctp_abort_association(inp, stcb, m, iphlen,
2389                                     src, dst, sh, op_err,
2390                                     mflowtype, mflowid,
2391                                     vrf_id, port);
2392                                 return (2);
2393                         }
2394                         if ((size_t)chk_length == sizeof(struct sctp_data_chunk)) {
2395                                 /*
2396                                  * Need to send an abort since we had an
2397                                  * empty data chunk.
2398                                  */
2399                                 struct mbuf *op_err;
2400
2401                                 op_err = sctp_generate_no_user_data_cause(ch->dp.tsn);
2402                                 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_22;
2403                                 sctp_abort_association(inp, stcb, m, iphlen,
2404                                     src, dst, sh, op_err,
2405                                     mflowtype, mflowid,
2406                                     vrf_id, port);
2407                                 return (2);
2408                         }
2409 #ifdef SCTP_AUDITING_ENABLED
2410                         sctp_audit_log(0xB1, 0);
2411 #endif
2412                         if (SCTP_SIZE32(chk_length) == (length - *offset)) {
2413                                 last_chunk = 1;
2414                         } else {
2415                                 last_chunk = 0;
2416                         }
2417                         if (sctp_process_a_data_chunk(stcb, asoc, mm, *offset, ch,
2418                             chk_length, net, high_tsn, &abort_flag, &break_flag,
2419                             last_chunk)) {
2420                                 num_chunks++;
2421                         }
2422                         if (abort_flag)
2423                                 return (2);
2424
2425                         if (break_flag) {
2426                                 /*
2427                                  * Set because of out of rwnd space and no
2428                                  * drop rep space left.
2429                                  */
2430                                 stop_proc = 1;
2431                                 continue;
2432                         }
2433                 } else {
2434                         /* not a data chunk in the data region */
2435                         switch (ch->ch.chunk_type) {
2436                         case SCTP_INITIATION:
2437                         case SCTP_INITIATION_ACK:
2438                         case SCTP_SELECTIVE_ACK:
2439                         case SCTP_NR_SELECTIVE_ACK:
2440                         case SCTP_HEARTBEAT_REQUEST:
2441                         case SCTP_HEARTBEAT_ACK:
2442                         case SCTP_ABORT_ASSOCIATION:
2443                         case SCTP_SHUTDOWN:
2444                         case SCTP_SHUTDOWN_ACK:
2445                         case SCTP_OPERATION_ERROR:
2446                         case SCTP_COOKIE_ECHO:
2447                         case SCTP_COOKIE_ACK:
2448                         case SCTP_ECN_ECHO:
2449                         case SCTP_ECN_CWR:
2450                         case SCTP_SHUTDOWN_COMPLETE:
2451                         case SCTP_AUTHENTICATION:
2452                         case SCTP_ASCONF_ACK:
2453                         case SCTP_PACKET_DROPPED:
2454                         case SCTP_STREAM_RESET:
2455                         case SCTP_FORWARD_CUM_TSN:
2456                         case SCTP_ASCONF:
2457                                 /*
2458                                  * Now, what do we do with KNOWN chunks that
2459                                  * are NOT in the right place?
2460                                  *
2461                                  * For now, I do nothing but ignore them. We
2462                                  * may later want to add sysctl stuff to
2463                                  * switch out and do either an ABORT() or
2464                                  * possibly process them.
2465                                  */
2466                                 if (SCTP_BASE_SYSCTL(sctp_strict_data_order)) {
2467                                         struct mbuf *op_err;
2468
2469                                         op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, "");
2470                                         sctp_abort_association(inp, stcb,
2471                                             m, iphlen,
2472                                             src, dst,
2473                                             sh, op_err,
2474                                             mflowtype, mflowid,
2475                                             vrf_id, port);
2476                                         return (2);
2477                                 }
2478                                 break;
2479                         default:
2480                                 /* unknown chunk type, use bit rules */
2481                                 if (ch->ch.chunk_type & 0x40) {
2482                                         /* Add a error report to the queue */
2483                                         struct mbuf *merr;
2484                                         struct sctp_paramhdr *phd;
2485
2486                                         merr = sctp_get_mbuf_for_msg(sizeof(*phd), 0, M_NOWAIT, 1, MT_DATA);
2487                                         if (merr) {
2488                                                 phd = mtod(merr, struct sctp_paramhdr *);
2489                                                 /*
2490                                                  * We cheat and use param
2491                                                  * type since we did not
2492                                                  * bother to define a error
2493                                                  * cause struct. They are
2494                                                  * the same basic format
2495                                                  * with different names.
2496                                                  */
2497                                                 phd->param_type =
2498                                                     htons(SCTP_CAUSE_UNRECOG_CHUNK);
2499                                                 phd->param_length =
2500                                                     htons(chk_length + sizeof(*phd));
2501                                                 SCTP_BUF_LEN(merr) = sizeof(*phd);
2502                                                 SCTP_BUF_NEXT(merr) = SCTP_M_COPYM(m, *offset, chk_length, M_NOWAIT);
2503                                                 if (SCTP_BUF_NEXT(merr)) {
2504                                                         if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(merr), SCTP_SIZE32(chk_length) - chk_length, NULL) == NULL) {
2505                                                                 sctp_m_freem(merr);
2506                                                         } else {
2507                                                                 sctp_queue_op_err(stcb, merr);
2508                                                         }
2509                                                 } else {
2510                                                         sctp_m_freem(merr);
2511                                                 }
2512                                         }
2513                                 }
2514                                 if ((ch->ch.chunk_type & 0x80) == 0) {
2515                                         /* discard the rest of this packet */
2516                                         stop_proc = 1;
2517                                 }       /* else skip this bad chunk and
2518                                          * continue... */
2519                                 break;
2520                         }       /* switch of chunk type */
2521                 }
2522                 *offset += SCTP_SIZE32(chk_length);
2523                 if ((*offset >= length) || stop_proc) {
2524                         /* no more data left in the mbuf chain */
2525                         stop_proc = 1;
2526                         continue;
2527                 }
2528                 ch = (struct sctp_data_chunk *)sctp_m_getptr(m, *offset,
2529                     sizeof(struct sctp_data_chunk), (uint8_t *) & chunk_buf);
2530                 if (ch == NULL) {
2531                         *offset = length;
2532                         stop_proc = 1;
2533                         continue;
2534                 }
2535         }
2536         if (break_flag) {
2537                 /*
2538                  * we need to report rwnd overrun drops.
2539                  */
2540                 sctp_send_packet_dropped(stcb, net, *mm, length, iphlen, 0);
2541         }
2542         if (num_chunks) {
2543                 /*
2544                  * Did we get data, if so update the time for auto-close and
2545                  * give peer credit for being alive.
2546                  */
2547                 SCTP_STAT_INCR(sctps_recvpktwithdata);
2548                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
2549                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
2550                             stcb->asoc.overall_error_count,
2551                             0,
2552                             SCTP_FROM_SCTP_INDATA,
2553                             __LINE__);
2554                 }
2555                 stcb->asoc.overall_error_count = 0;
2556                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_last_rcvd);
2557         }
2558         /* now service all of the reassm queue if needed */
2559         if (!(TAILQ_EMPTY(&asoc->reasmqueue)))
2560                 sctp_service_queues(stcb, asoc);
2561
2562         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
2563                 /* Assure that we ack right away */
2564                 stcb->asoc.send_sack = 1;
2565         }
2566         /* Start a sack timer or QUEUE a SACK for sending */
2567         sctp_sack_check(stcb, was_a_gap);
2568         return (0);
2569 }
2570
2571 static int
2572 sctp_process_segment_range(struct sctp_tcb *stcb, struct sctp_tmit_chunk **p_tp1, uint32_t last_tsn,
2573     uint16_t frag_strt, uint16_t frag_end, int nr_sacking,
2574     int *num_frs,
2575     uint32_t * biggest_newly_acked_tsn,
2576     uint32_t * this_sack_lowest_newack,
2577     int *rto_ok)
2578 {
2579         struct sctp_tmit_chunk *tp1;
2580         unsigned int theTSN;
2581         int j, wake_him = 0, circled = 0;
2582
2583         /* Recover the tp1 we last saw */
2584         tp1 = *p_tp1;
2585         if (tp1 == NULL) {
2586                 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue);
2587         }
2588         for (j = frag_strt; j <= frag_end; j++) {
2589                 theTSN = j + last_tsn;
2590                 while (tp1) {
2591                         if (tp1->rec.data.doing_fast_retransmit)
2592                                 (*num_frs) += 1;
2593
2594                         /*-
2595                          * CMT: CUCv2 algorithm. For each TSN being
2596                          * processed from the sent queue, track the
2597                          * next expected pseudo-cumack, or
2598                          * rtx_pseudo_cumack, if required. Separate
2599                          * cumack trackers for first transmissions,
2600                          * and retransmissions.
2601                          */
2602                         if ((tp1->sent < SCTP_DATAGRAM_RESEND) &&
2603                             (tp1->whoTo->find_pseudo_cumack == 1) &&
2604                             (tp1->snd_count == 1)) {
2605                                 tp1->whoTo->pseudo_cumack = tp1->rec.data.TSN_seq;
2606                                 tp1->whoTo->find_pseudo_cumack = 0;
2607                         }
2608                         if ((tp1->sent < SCTP_DATAGRAM_RESEND) &&
2609                             (tp1->whoTo->find_rtx_pseudo_cumack == 1) &&
2610                             (tp1->snd_count > 1)) {
2611                                 tp1->whoTo->rtx_pseudo_cumack = tp1->rec.data.TSN_seq;
2612                                 tp1->whoTo->find_rtx_pseudo_cumack = 0;
2613                         }
2614                         if (tp1->rec.data.TSN_seq == theTSN) {
2615                                 if (tp1->sent != SCTP_DATAGRAM_UNSENT) {
2616                                         /*-
2617                                          * must be held until
2618                                          * cum-ack passes
2619                                          */
2620                                         if (tp1->sent < SCTP_DATAGRAM_RESEND) {
2621                                                 /*-
2622                                                  * If it is less than RESEND, it is
2623                                                  * now no-longer in flight.
2624                                                  * Higher values may already be set
2625                                                  * via previous Gap Ack Blocks...
2626                                                  * i.e. ACKED or RESEND.
2627                                                  */
2628                                                 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq,
2629                                                     *biggest_newly_acked_tsn)) {
2630                                                         *biggest_newly_acked_tsn = tp1->rec.data.TSN_seq;
2631                                                 }
2632                                                 /*-
2633                                                  * CMT: SFR algo (and HTNA) - set
2634                                                  * saw_newack to 1 for dest being
2635                                                  * newly acked. update
2636                                                  * this_sack_highest_newack if
2637                                                  * appropriate.
2638                                                  */
2639                                                 if (tp1->rec.data.chunk_was_revoked == 0)
2640                                                         tp1->whoTo->saw_newack = 1;
2641
2642                                                 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq,
2643                                                     tp1->whoTo->this_sack_highest_newack)) {
2644                                                         tp1->whoTo->this_sack_highest_newack =
2645                                                             tp1->rec.data.TSN_seq;
2646                                                 }
2647                                                 /*-
2648                                                  * CMT DAC algo: also update
2649                                                  * this_sack_lowest_newack
2650                                                  */
2651                                                 if (*this_sack_lowest_newack == 0) {
2652                                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
2653                                                                 sctp_log_sack(*this_sack_lowest_newack,
2654                                                                     last_tsn,
2655                                                                     tp1->rec.data.TSN_seq,
2656                                                                     0,
2657                                                                     0,
2658                                                                     SCTP_LOG_TSN_ACKED);
2659                                                         }
2660                                                         *this_sack_lowest_newack = tp1->rec.data.TSN_seq;
2661                                                 }
2662                                                 /*-
2663                                                  * CMT: CUCv2 algorithm. If (rtx-)pseudo-cumack for corresp
2664                                                  * dest is being acked, then we have a new (rtx-)pseudo-cumack. Set
2665                                                  * new_(rtx_)pseudo_cumack to TRUE so that the cwnd for this dest can be
2666                                                  * updated. Also trigger search for the next expected (rtx-)pseudo-cumack.
2667                                                  * Separate pseudo_cumack trackers for first transmissions and
2668                                                  * retransmissions.
2669                                                  */
2670                                                 if (tp1->rec.data.TSN_seq == tp1->whoTo->pseudo_cumack) {
2671                                                         if (tp1->rec.data.chunk_was_revoked == 0) {
2672                                                                 tp1->whoTo->new_pseudo_cumack = 1;
2673                                                         }
2674                                                         tp1->whoTo->find_pseudo_cumack = 1;
2675                                                 }
2676                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
2677                                                         sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK);
2678                                                 }
2679                                                 if (tp1->rec.data.TSN_seq == tp1->whoTo->rtx_pseudo_cumack) {
2680                                                         if (tp1->rec.data.chunk_was_revoked == 0) {
2681                                                                 tp1->whoTo->new_pseudo_cumack = 1;
2682                                                         }
2683                                                         tp1->whoTo->find_rtx_pseudo_cumack = 1;
2684                                                 }
2685                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
2686                                                         sctp_log_sack(*biggest_newly_acked_tsn,
2687                                                             last_tsn,
2688                                                             tp1->rec.data.TSN_seq,
2689                                                             frag_strt,
2690                                                             frag_end,
2691                                                             SCTP_LOG_TSN_ACKED);
2692                                                 }
2693                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
2694                                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_GAP,
2695                                                             tp1->whoTo->flight_size,
2696                                                             tp1->book_size,
2697                                                             (uintptr_t) tp1->whoTo,
2698                                                             tp1->rec.data.TSN_seq);
2699                                                 }
2700                                                 sctp_flight_size_decrease(tp1);
2701                                                 if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) {
2702                                                         (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo,
2703                                                             tp1);
2704                                                 }
2705                                                 sctp_total_flight_decrease(stcb, tp1);
2706
2707                                                 tp1->whoTo->net_ack += tp1->send_size;
2708                                                 if (tp1->snd_count < 2) {
2709                                                         /*-
2710                                                          * True non-retransmited chunk
2711                                                          */
2712                                                         tp1->whoTo->net_ack2 += tp1->send_size;
2713
2714                                                         /*-
2715                                                          * update RTO too ?
2716                                                          */
2717                                                         if (tp1->do_rtt) {
2718                                                                 if (*rto_ok) {
2719                                                                         tp1->whoTo->RTO =
2720                                                                             sctp_calculate_rto(stcb,
2721                                                                             &stcb->asoc,
2722                                                                             tp1->whoTo,
2723                                                                             &tp1->sent_rcv_time,
2724                                                                             sctp_align_safe_nocopy,
2725                                                                             SCTP_RTT_FROM_DATA);
2726                                                                         *rto_ok = 0;
2727                                                                 }
2728                                                                 if (tp1->whoTo->rto_needed == 0) {
2729                                                                         tp1->whoTo->rto_needed = 1;
2730                                                                 }
2731                                                                 tp1->do_rtt = 0;
2732                                                         }
2733                                                 }
2734                                         }
2735                                         if (tp1->sent <= SCTP_DATAGRAM_RESEND) {
2736                                                 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq,
2737                                                     stcb->asoc.this_sack_highest_gap)) {
2738                                                         stcb->asoc.this_sack_highest_gap =
2739                                                             tp1->rec.data.TSN_seq;
2740                                                 }
2741                                                 if (tp1->sent == SCTP_DATAGRAM_RESEND) {
2742                                                         sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
2743 #ifdef SCTP_AUDITING_ENABLED
2744                                                         sctp_audit_log(0xB2,
2745                                                             (stcb->asoc.sent_queue_retran_cnt & 0x000000ff));
2746 #endif
2747                                                 }
2748                                         }
2749                                         /*-
2750                                          * All chunks NOT UNSENT fall through here and are marked
2751                                          * (leave PR-SCTP ones that are to skip alone though)
2752                                          */
2753                                         if ((tp1->sent != SCTP_FORWARD_TSN_SKIP) &&
2754                                             (tp1->sent != SCTP_DATAGRAM_NR_ACKED)) {
2755                                                 tp1->sent = SCTP_DATAGRAM_MARKED;
2756                                         }
2757                                         if (tp1->rec.data.chunk_was_revoked) {
2758                                                 /* deflate the cwnd */
2759                                                 tp1->whoTo->cwnd -= tp1->book_size;
2760                                                 tp1->rec.data.chunk_was_revoked = 0;
2761                                         }
2762                                         /* NR Sack code here */
2763                                         if (nr_sacking &&
2764                                             (tp1->sent != SCTP_DATAGRAM_NR_ACKED)) {
2765                                                 if (stcb->asoc.strmout[tp1->rec.data.stream_number].chunks_on_queues > 0) {
2766                                                         stcb->asoc.strmout[tp1->rec.data.stream_number].chunks_on_queues--;
2767 #ifdef INVARIANTS
2768                                                 } else {
2769                                                         panic("No chunks on the queues for sid %u.", tp1->rec.data.stream_number);
2770 #endif
2771                                                 }
2772                                                 tp1->sent = SCTP_DATAGRAM_NR_ACKED;
2773                                                 if (tp1->data) {
2774                                                         /*
2775                                                          * sa_ignore
2776                                                          * NO_NULL_CHK
2777                                                          */
2778                                                         sctp_free_bufspace(stcb, &stcb->asoc, tp1, 1);
2779                                                         sctp_m_freem(tp1->data);
2780                                                         tp1->data = NULL;
2781                                                 }
2782                                                 wake_him++;
2783                                         }
2784                                 }
2785                                 break;
2786                         }       /* if (tp1->TSN_seq == theTSN) */
2787                         if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, theTSN)) {
2788                                 break;
2789                         }
2790                         tp1 = TAILQ_NEXT(tp1, sctp_next);
2791                         if ((tp1 == NULL) && (circled == 0)) {
2792                                 circled++;
2793                                 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue);
2794                         }
2795                 }               /* end while (tp1) */
2796                 if (tp1 == NULL) {
2797                         circled = 0;
2798                         tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue);
2799                 }
2800                 /* In case the fragments were not in order we must reset */
2801         }                       /* end for (j = fragStart */
2802         *p_tp1 = tp1;
2803         return (wake_him);      /* Return value only used for nr-sack */
2804 }
2805
2806
2807 static int
2808 sctp_handle_segments(struct mbuf *m, int *offset, struct sctp_tcb *stcb, struct sctp_association *asoc,
2809     uint32_t last_tsn, uint32_t * biggest_tsn_acked,
2810     uint32_t * biggest_newly_acked_tsn, uint32_t * this_sack_lowest_newack,
2811     int num_seg, int num_nr_seg, int *rto_ok)
2812 {
2813         struct sctp_gap_ack_block *frag, block;
2814         struct sctp_tmit_chunk *tp1;
2815         int i;
2816         int num_frs = 0;
2817         int chunk_freed;
2818         int non_revocable;
2819         uint16_t frag_strt, frag_end, prev_frag_end;
2820
2821         tp1 = TAILQ_FIRST(&asoc->sent_queue);
2822         prev_frag_end = 0;
2823         chunk_freed = 0;
2824
2825         for (i = 0; i < (num_seg + num_nr_seg); i++) {
2826                 if (i == num_seg) {
2827                         prev_frag_end = 0;
2828                         tp1 = TAILQ_FIRST(&asoc->sent_queue);
2829                 }
2830                 frag = (struct sctp_gap_ack_block *)sctp_m_getptr(m, *offset,
2831                     sizeof(struct sctp_gap_ack_block), (uint8_t *) & block);
2832                 *offset += sizeof(block);
2833                 if (frag == NULL) {
2834                         return (chunk_freed);
2835                 }
2836                 frag_strt = ntohs(frag->start);
2837                 frag_end = ntohs(frag->end);
2838
2839                 if (frag_strt > frag_end) {
2840                         /* This gap report is malformed, skip it. */
2841                         continue;
2842                 }
2843                 if (frag_strt <= prev_frag_end) {
2844                         /* This gap report is not in order, so restart. */
2845                         tp1 = TAILQ_FIRST(&asoc->sent_queue);
2846                 }
2847                 if (SCTP_TSN_GT((last_tsn + frag_end), *biggest_tsn_acked)) {
2848                         *biggest_tsn_acked = last_tsn + frag_end;
2849                 }
2850                 if (i < num_seg) {
2851                         non_revocable = 0;
2852                 } else {
2853                         non_revocable = 1;
2854                 }
2855                 if (sctp_process_segment_range(stcb, &tp1, last_tsn, frag_strt, frag_end,
2856                     non_revocable, &num_frs, biggest_newly_acked_tsn,
2857                     this_sack_lowest_newack, rto_ok)) {
2858                         chunk_freed = 1;
2859                 }
2860                 prev_frag_end = frag_end;
2861         }
2862         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
2863                 if (num_frs)
2864                         sctp_log_fr(*biggest_tsn_acked,
2865                             *biggest_newly_acked_tsn,
2866                             last_tsn, SCTP_FR_LOG_BIGGEST_TSNS);
2867         }
2868         return (chunk_freed);
2869 }
2870
2871 static void
2872 sctp_check_for_revoked(struct sctp_tcb *stcb,
2873     struct sctp_association *asoc, uint32_t cumack,
2874     uint32_t biggest_tsn_acked)
2875 {
2876         struct sctp_tmit_chunk *tp1;
2877
2878         TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
2879                 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, cumack)) {
2880                         /*
2881                          * ok this guy is either ACK or MARKED. If it is
2882                          * ACKED it has been previously acked but not this
2883                          * time i.e. revoked.  If it is MARKED it was ACK'ed
2884                          * again.
2885                          */
2886                         if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, biggest_tsn_acked)) {
2887                                 break;
2888                         }
2889                         if (tp1->sent == SCTP_DATAGRAM_ACKED) {
2890                                 /* it has been revoked */
2891                                 tp1->sent = SCTP_DATAGRAM_SENT;
2892                                 tp1->rec.data.chunk_was_revoked = 1;
2893                                 /*
2894                                  * We must add this stuff back in to assure
2895                                  * timers and such get started.
2896                                  */
2897                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
2898                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_REVOKE,
2899                                             tp1->whoTo->flight_size,
2900                                             tp1->book_size,
2901                                             (uintptr_t) tp1->whoTo,
2902                                             tp1->rec.data.TSN_seq);
2903                                 }
2904                                 sctp_flight_size_increase(tp1);
2905                                 sctp_total_flight_increase(stcb, tp1);
2906                                 /*
2907                                  * We inflate the cwnd to compensate for our
2908                                  * artificial inflation of the flight_size.
2909                                  */
2910                                 tp1->whoTo->cwnd += tp1->book_size;
2911                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
2912                                         sctp_log_sack(asoc->last_acked_seq,
2913                                             cumack,
2914                                             tp1->rec.data.TSN_seq,
2915                                             0,
2916                                             0,
2917                                             SCTP_LOG_TSN_REVOKED);
2918                                 }
2919                         } else if (tp1->sent == SCTP_DATAGRAM_MARKED) {
2920                                 /* it has been re-acked in this SACK */
2921                                 tp1->sent = SCTP_DATAGRAM_ACKED;
2922                         }
2923                 }
2924                 if (tp1->sent == SCTP_DATAGRAM_UNSENT)
2925                         break;
2926         }
2927 }
2928
2929
2930 static void
2931 sctp_strike_gap_ack_chunks(struct sctp_tcb *stcb, struct sctp_association *asoc,
2932     uint32_t biggest_tsn_acked, uint32_t biggest_tsn_newly_acked, uint32_t this_sack_lowest_newack, int accum_moved)
2933 {
2934         struct sctp_tmit_chunk *tp1;
2935         int strike_flag = 0;
2936         struct timeval now;
2937         int tot_retrans = 0;
2938         uint32_t sending_seq;
2939         struct sctp_nets *net;
2940         int num_dests_sacked = 0;
2941
2942         /*
2943          * select the sending_seq, this is either the next thing ready to be
2944          * sent but not transmitted, OR, the next seq we assign.
2945          */
2946         tp1 = TAILQ_FIRST(&stcb->asoc.send_queue);
2947         if (tp1 == NULL) {
2948                 sending_seq = asoc->sending_seq;
2949         } else {
2950                 sending_seq = tp1->rec.data.TSN_seq;
2951         }
2952
2953         /* CMT DAC algo: finding out if SACK is a mixed SACK */
2954         if ((asoc->sctp_cmt_on_off > 0) &&
2955             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
2956                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
2957                         if (net->saw_newack)
2958                                 num_dests_sacked++;
2959                 }
2960         }
2961         if (stcb->asoc.prsctp_supported) {
2962                 (void)SCTP_GETTIME_TIMEVAL(&now);
2963         }
2964         TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
2965                 strike_flag = 0;
2966                 if (tp1->no_fr_allowed) {
2967                         /* this one had a timeout or something */
2968                         continue;
2969                 }
2970                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
2971                         if (tp1->sent < SCTP_DATAGRAM_RESEND)
2972                                 sctp_log_fr(biggest_tsn_newly_acked,
2973                                     tp1->rec.data.TSN_seq,
2974                                     tp1->sent,
2975                                     SCTP_FR_LOG_CHECK_STRIKE);
2976                 }
2977                 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, biggest_tsn_acked) ||
2978                     tp1->sent == SCTP_DATAGRAM_UNSENT) {
2979                         /* done */
2980                         break;
2981                 }
2982                 if (stcb->asoc.prsctp_supported) {
2983                         if ((PR_SCTP_TTL_ENABLED(tp1->flags)) && tp1->sent < SCTP_DATAGRAM_ACKED) {
2984                                 /* Is it expired? */
2985                                 if (timevalcmp(&now, &tp1->rec.data.timetodrop, >)) {
2986                                         /* Yes so drop it */
2987                                         if (tp1->data != NULL) {
2988                                                 (void)sctp_release_pr_sctp_chunk(stcb, tp1, 1,
2989                                                     SCTP_SO_NOT_LOCKED);
2990                                         }
2991                                         continue;
2992                                 }
2993                         }
2994                 }
2995                 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, asoc->this_sack_highest_gap)) {
2996                         /* we are beyond the tsn in the sack  */
2997                         break;
2998                 }
2999                 if (tp1->sent >= SCTP_DATAGRAM_RESEND) {
3000                         /* either a RESEND, ACKED, or MARKED */
3001                         /* skip */
3002                         if (tp1->sent == SCTP_FORWARD_TSN_SKIP) {
3003                                 /* Continue strikin FWD-TSN chunks */
3004                                 tp1->rec.data.fwd_tsn_cnt++;
3005                         }
3006                         continue;
3007                 }
3008                 /*
3009                  * CMT : SFR algo (covers part of DAC and HTNA as well)
3010                  */
3011                 if (tp1->whoTo && tp1->whoTo->saw_newack == 0) {
3012                         /*
3013                          * No new acks were receieved for data sent to this
3014                          * dest. Therefore, according to the SFR algo for
3015                          * CMT, no data sent to this dest can be marked for
3016                          * FR using this SACK.
3017                          */
3018                         continue;
3019                 } else if (tp1->whoTo && SCTP_TSN_GT(tp1->rec.data.TSN_seq,
3020                     tp1->whoTo->this_sack_highest_newack)) {
3021                         /*
3022                          * CMT: New acks were receieved for data sent to
3023                          * this dest. But no new acks were seen for data
3024                          * sent after tp1. Therefore, according to the SFR
3025                          * algo for CMT, tp1 cannot be marked for FR using
3026                          * this SACK. This step covers part of the DAC algo
3027                          * and the HTNA algo as well.
3028                          */
3029                         continue;
3030                 }
3031                 /*
3032                  * Here we check to see if we were have already done a FR
3033                  * and if so we see if the biggest TSN we saw in the sack is
3034                  * smaller than the recovery point. If so we don't strike
3035                  * the tsn... otherwise we CAN strike the TSN.
3036                  */
3037                 /*
3038                  * @@@ JRI: Check for CMT if (accum_moved &&
3039                  * asoc->fast_retran_loss_recovery && (sctp_cmt_on_off ==
3040                  * 0)) {
3041                  */
3042                 if (accum_moved && asoc->fast_retran_loss_recovery) {
3043                         /*
3044                          * Strike the TSN if in fast-recovery and cum-ack
3045                          * moved.
3046                          */
3047                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
3048                                 sctp_log_fr(biggest_tsn_newly_acked,
3049                                     tp1->rec.data.TSN_seq,
3050                                     tp1->sent,
3051                                     SCTP_FR_LOG_STRIKE_CHUNK);
3052                         }
3053                         if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3054                                 tp1->sent++;
3055                         }
3056                         if ((asoc->sctp_cmt_on_off > 0) &&
3057                             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
3058                                 /*
3059                                  * CMT DAC algorithm: If SACK flag is set to
3060                                  * 0, then lowest_newack test will not pass
3061                                  * because it would have been set to the
3062                                  * cumack earlier. If not already to be
3063                                  * rtx'd, If not a mixed sack and if tp1 is
3064                                  * not between two sacked TSNs, then mark by
3065                                  * one more. NOTE that we are marking by one
3066                                  * additional time since the SACK DAC flag
3067                                  * indicates that two packets have been
3068                                  * received after this missing TSN.
3069                                  */
3070                                 if ((tp1->sent < SCTP_DATAGRAM_RESEND) && (num_dests_sacked == 1) &&
3071                                     SCTP_TSN_GT(this_sack_lowest_newack, tp1->rec.data.TSN_seq)) {
3072                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
3073                                                 sctp_log_fr(16 + num_dests_sacked,
3074                                                     tp1->rec.data.TSN_seq,
3075                                                     tp1->sent,
3076                                                     SCTP_FR_LOG_STRIKE_CHUNK);
3077                                         }
3078                                         tp1->sent++;
3079                                 }
3080                         }
3081                 } else if ((tp1->rec.data.doing_fast_retransmit) &&
3082                     (asoc->sctp_cmt_on_off == 0)) {
3083                         /*
3084                          * For those that have done a FR we must take
3085                          * special consideration if we strike. I.e the
3086                          * biggest_newly_acked must be higher than the
3087                          * sending_seq at the time we did the FR.
3088                          */
3089                         if (
3090 #ifdef SCTP_FR_TO_ALTERNATE
3091                         /*
3092                          * If FR's go to new networks, then we must only do
3093                          * this for singly homed asoc's. However if the FR's
3094                          * go to the same network (Armando's work) then its
3095                          * ok to FR multiple times.
3096                          */
3097                             (asoc->numnets < 2)
3098 #else
3099                             (1)
3100 #endif
3101                             ) {
3102
3103                                 if (SCTP_TSN_GE(biggest_tsn_newly_acked,
3104                                     tp1->rec.data.fast_retran_tsn)) {
3105                                         /*
3106                                          * Strike the TSN, since this ack is
3107                                          * beyond where things were when we
3108                                          * did a FR.
3109                                          */
3110                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
3111                                                 sctp_log_fr(biggest_tsn_newly_acked,
3112                                                     tp1->rec.data.TSN_seq,
3113                                                     tp1->sent,
3114                                                     SCTP_FR_LOG_STRIKE_CHUNK);
3115                                         }
3116                                         if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3117                                                 tp1->sent++;
3118                                         }
3119                                         strike_flag = 1;
3120                                         if ((asoc->sctp_cmt_on_off > 0) &&
3121                                             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
3122                                                 /*
3123                                                  * CMT DAC algorithm: If
3124                                                  * SACK flag is set to 0,
3125                                                  * then lowest_newack test
3126                                                  * will not pass because it
3127                                                  * would have been set to
3128                                                  * the cumack earlier. If
3129                                                  * not already to be rtx'd,
3130                                                  * If not a mixed sack and
3131                                                  * if tp1 is not between two
3132                                                  * sacked TSNs, then mark by
3133                                                  * one more. NOTE that we
3134                                                  * are marking by one
3135                                                  * additional time since the
3136                                                  * SACK DAC flag indicates
3137                                                  * that two packets have
3138                                                  * been received after this
3139                                                  * missing TSN.
3140                                                  */
3141                                                 if ((tp1->sent < SCTP_DATAGRAM_RESEND) &&
3142                                                     (num_dests_sacked == 1) &&
3143                                                     SCTP_TSN_GT(this_sack_lowest_newack,
3144                                                     tp1->rec.data.TSN_seq)) {
3145                                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
3146                                                                 sctp_log_fr(32 + num_dests_sacked,
3147                                                                     tp1->rec.data.TSN_seq,
3148                                                                     tp1->sent,
3149                                                                     SCTP_FR_LOG_STRIKE_CHUNK);
3150                                                         }
3151                                                         if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3152                                                                 tp1->sent++;
3153                                                         }
3154                                                 }
3155                                         }
3156                                 }
3157                         }
3158                         /*
3159                          * JRI: TODO: remove code for HTNA algo. CMT's SFR
3160                          * algo covers HTNA.
3161                          */
3162                 } else if (SCTP_TSN_GT(tp1->rec.data.TSN_seq,
3163                     biggest_tsn_newly_acked)) {
3164                         /*
3165                          * We don't strike these: This is the  HTNA
3166                          * algorithm i.e. we don't strike If our TSN is
3167                          * larger than the Highest TSN Newly Acked.
3168                          */
3169                         ;
3170                 } else {
3171                         /* Strike the TSN */
3172                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
3173                                 sctp_log_fr(biggest_tsn_newly_acked,
3174                                     tp1->rec.data.TSN_seq,
3175                                     tp1->sent,
3176                                     SCTP_FR_LOG_STRIKE_CHUNK);
3177                         }
3178                         if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3179                                 tp1->sent++;
3180                         }
3181                         if ((asoc->sctp_cmt_on_off > 0) &&
3182                             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
3183                                 /*
3184                                  * CMT DAC algorithm: If SACK flag is set to
3185                                  * 0, then lowest_newack test will not pass
3186                                  * because it would have been set to the
3187                                  * cumack earlier. If not already to be
3188                                  * rtx'd, If not a mixed sack and if tp1 is
3189                                  * not between two sacked TSNs, then mark by
3190                                  * one more. NOTE that we are marking by one
3191                                  * additional time since the SACK DAC flag
3192                                  * indicates that two packets have been
3193                                  * received after this missing TSN.
3194                                  */
3195                                 if ((tp1->sent < SCTP_DATAGRAM_RESEND) && (num_dests_sacked == 1) &&
3196                                     SCTP_TSN_GT(this_sack_lowest_newack, tp1->rec.data.TSN_seq)) {
3197                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
3198                                                 sctp_log_fr(48 + num_dests_sacked,
3199                                                     tp1->rec.data.TSN_seq,
3200                                                     tp1->sent,
3201                                                     SCTP_FR_LOG_STRIKE_CHUNK);
3202                                         }
3203                                         tp1->sent++;
3204                                 }
3205                         }
3206                 }
3207                 if (tp1->sent == SCTP_DATAGRAM_RESEND) {
3208                         struct sctp_nets *alt;
3209
3210                         /* fix counts and things */
3211                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3212                                 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_RSND,
3213                                     (tp1->whoTo ? (tp1->whoTo->flight_size) : 0),
3214                                     tp1->book_size,
3215                                     (uintptr_t) tp1->whoTo,
3216                                     tp1->rec.data.TSN_seq);
3217                         }
3218                         if (tp1->whoTo) {
3219                                 tp1->whoTo->net_ack++;
3220                                 sctp_flight_size_decrease(tp1);
3221                                 if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) {
3222                                         (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo,
3223                                             tp1);
3224                                 }
3225                         }
3226                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
3227                                 sctp_log_rwnd(SCTP_INCREASE_PEER_RWND,
3228                                     asoc->peers_rwnd, tp1->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
3229                         }
3230                         /* add back to the rwnd */
3231                         asoc->peers_rwnd += (tp1->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
3232
3233                         /* remove from the total flight */
3234                         sctp_total_flight_decrease(stcb, tp1);
3235
3236                         if ((stcb->asoc.prsctp_supported) &&
3237                             (PR_SCTP_RTX_ENABLED(tp1->flags))) {
3238                                 /*
3239                                  * Has it been retransmitted tv_sec times? -
3240                                  * we store the retran count there.
3241                                  */
3242                                 if (tp1->snd_count > tp1->rec.data.timetodrop.tv_sec) {
3243                                         /* Yes, so drop it */
3244                                         if (tp1->data != NULL) {
3245                                                 (void)sctp_release_pr_sctp_chunk(stcb, tp1, 1,
3246                                                     SCTP_SO_NOT_LOCKED);
3247                                         }
3248                                         /* Make sure to flag we had a FR */
3249                                         tp1->whoTo->net_ack++;
3250                                         continue;
3251                                 }
3252                         }
3253                         /*
3254                          * SCTP_PRINTF("OK, we are now ready to FR this
3255                          * guy\n");
3256                          */
3257                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
3258                                 sctp_log_fr(tp1->rec.data.TSN_seq, tp1->snd_count,
3259                                     0, SCTP_FR_MARKED);
3260                         }
3261                         if (strike_flag) {
3262                                 /* This is a subsequent FR */
3263                                 SCTP_STAT_INCR(sctps_sendmultfastretrans);
3264                         }
3265                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3266                         if (asoc->sctp_cmt_on_off > 0) {
3267                                 /*
3268                                  * CMT: Using RTX_SSTHRESH policy for CMT.
3269                                  * If CMT is being used, then pick dest with
3270                                  * largest ssthresh for any retransmission.
3271                                  */
3272                                 tp1->no_fr_allowed = 1;
3273                                 alt = tp1->whoTo;
3274                                 /* sa_ignore NO_NULL_CHK */
3275                                 if (asoc->sctp_cmt_pf > 0) {
3276                                         /*
3277                                          * JRS 5/18/07 - If CMT PF is on,
3278                                          * use the PF version of
3279                                          * find_alt_net()
3280                                          */
3281                                         alt = sctp_find_alternate_net(stcb, alt, 2);
3282                                 } else {
3283                                         /*
3284                                          * JRS 5/18/07 - If only CMT is on,
3285                                          * use the CMT version of
3286                                          * find_alt_net()
3287                                          */
3288                                         /* sa_ignore NO_NULL_CHK */
3289                                         alt = sctp_find_alternate_net(stcb, alt, 1);
3290                                 }
3291                                 if (alt == NULL) {
3292                                         alt = tp1->whoTo;
3293                                 }
3294                                 /*
3295                                  * CUCv2: If a different dest is picked for
3296                                  * the retransmission, then new
3297                                  * (rtx-)pseudo_cumack needs to be tracked
3298                                  * for orig dest. Let CUCv2 track new (rtx-)
3299                                  * pseudo-cumack always.
3300                                  */
3301                                 if (tp1->whoTo) {
3302                                         tp1->whoTo->find_pseudo_cumack = 1;
3303                                         tp1->whoTo->find_rtx_pseudo_cumack = 1;
3304                                 }
3305                         } else {/* CMT is OFF */
3306
3307 #ifdef SCTP_FR_TO_ALTERNATE
3308                                 /* Can we find an alternate? */
3309                                 alt = sctp_find_alternate_net(stcb, tp1->whoTo, 0);
3310 #else
3311                                 /*
3312                                  * default behavior is to NOT retransmit
3313                                  * FR's to an alternate. Armando Caro's
3314                                  * paper details why.
3315                                  */
3316                                 alt = tp1->whoTo;
3317 #endif
3318                         }
3319
3320                         tp1->rec.data.doing_fast_retransmit = 1;
3321                         tot_retrans++;
3322                         /* mark the sending seq for possible subsequent FR's */
3323                         /*
3324                          * SCTP_PRINTF("Marking TSN for FR new value %x\n",
3325                          * (uint32_t)tpi->rec.data.TSN_seq);
3326                          */
3327                         if (TAILQ_EMPTY(&asoc->send_queue)) {
3328                                 /*
3329                                  * If the queue of send is empty then its
3330                                  * the next sequence number that will be
3331                                  * assigned so we subtract one from this to
3332                                  * get the one we last sent.
3333                                  */
3334                                 tp1->rec.data.fast_retran_tsn = sending_seq;
3335                         } else {
3336                                 /*
3337                                  * If there are chunks on the send queue
3338                                  * (unsent data that has made it from the
3339                                  * stream queues but not out the door, we
3340                                  * take the first one (which will have the
3341                                  * lowest TSN) and subtract one to get the
3342                                  * one we last sent.
3343                                  */
3344                                 struct sctp_tmit_chunk *ttt;
3345
3346                                 ttt = TAILQ_FIRST(&asoc->send_queue);
3347                                 tp1->rec.data.fast_retran_tsn =
3348                                     ttt->rec.data.TSN_seq;
3349                         }
3350
3351                         if (tp1->do_rtt) {
3352                                 /*
3353                                  * this guy had a RTO calculation pending on
3354                                  * it, cancel it
3355                                  */
3356                                 if ((tp1->whoTo != NULL) &&
3357                                     (tp1->whoTo->rto_needed == 0)) {
3358                                         tp1->whoTo->rto_needed = 1;
3359                                 }
3360                                 tp1->do_rtt = 0;
3361                         }
3362                         if (alt != tp1->whoTo) {
3363                                 /* yes, there is an alternate. */
3364                                 sctp_free_remote_addr(tp1->whoTo);
3365                                 /* sa_ignore FREED_MEMORY */
3366                                 tp1->whoTo = alt;
3367                                 atomic_add_int(&alt->ref_count, 1);
3368                         }
3369                 }
3370         }
3371 }
3372
3373 struct sctp_tmit_chunk *
3374 sctp_try_advance_peer_ack_point(struct sctp_tcb *stcb,
3375     struct sctp_association *asoc)
3376 {
3377         struct sctp_tmit_chunk *tp1, *tp2, *a_adv = NULL;
3378         struct timeval now;
3379         int now_filled = 0;
3380
3381         if (asoc->prsctp_supported == 0) {
3382                 return (NULL);
3383         }
3384         TAILQ_FOREACH_SAFE(tp1, &asoc->sent_queue, sctp_next, tp2) {
3385                 if (tp1->sent != SCTP_FORWARD_TSN_SKIP &&
3386                     tp1->sent != SCTP_DATAGRAM_RESEND &&
3387                     tp1->sent != SCTP_DATAGRAM_NR_ACKED) {
3388                         /* no chance to advance, out of here */
3389                         break;
3390                 }
3391                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
3392                         if ((tp1->sent == SCTP_FORWARD_TSN_SKIP) ||
3393                             (tp1->sent == SCTP_DATAGRAM_NR_ACKED)) {
3394                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
3395                                     asoc->advanced_peer_ack_point,
3396                                     tp1->rec.data.TSN_seq, 0, 0);
3397                         }
3398                 }
3399                 if (!PR_SCTP_ENABLED(tp1->flags)) {
3400                         /*
3401                          * We can't fwd-tsn past any that are reliable aka
3402                          * retransmitted until the asoc fails.
3403                          */
3404                         break;
3405                 }
3406                 if (!now_filled) {
3407                         (void)SCTP_GETTIME_TIMEVAL(&now);
3408                         now_filled = 1;
3409                 }
3410                 /*
3411                  * now we got a chunk which is marked for another
3412                  * retransmission to a PR-stream but has run out its chances
3413                  * already maybe OR has been marked to skip now. Can we skip
3414                  * it if its a resend?
3415                  */
3416                 if (tp1->sent == SCTP_DATAGRAM_RESEND &&
3417                     (PR_SCTP_TTL_ENABLED(tp1->flags))) {
3418                         /*
3419                          * Now is this one marked for resend and its time is
3420                          * now up?
3421                          */
3422                         if (timevalcmp(&now, &tp1->rec.data.timetodrop, >)) {
3423                                 /* Yes so drop it */
3424                                 if (tp1->data) {
3425                                         (void)sctp_release_pr_sctp_chunk(stcb, tp1,
3426                                             1, SCTP_SO_NOT_LOCKED);
3427                                 }
3428                         } else {
3429                                 /*
3430                                  * No, we are done when hit one for resend
3431                                  * whos time as not expired.
3432                                  */
3433                                 break;
3434                         }
3435                 }
3436                 /*
3437                  * Ok now if this chunk is marked to drop it we can clean up
3438                  * the chunk, advance our peer ack point and we can check
3439                  * the next chunk.
3440                  */
3441                 if ((tp1->sent == SCTP_FORWARD_TSN_SKIP) ||
3442                     (tp1->sent == SCTP_DATAGRAM_NR_ACKED)) {
3443                         /* advance PeerAckPoint goes forward */
3444                         if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, asoc->advanced_peer_ack_point)) {
3445                                 asoc->advanced_peer_ack_point = tp1->rec.data.TSN_seq;
3446                                 a_adv = tp1;
3447                         } else if (tp1->rec.data.TSN_seq == asoc->advanced_peer_ack_point) {
3448                                 /* No update but we do save the chk */
3449                                 a_adv = tp1;
3450                         }
3451                 } else {
3452                         /*
3453                          * If it is still in RESEND we can advance no
3454                          * further
3455                          */
3456                         break;
3457                 }
3458         }
3459         return (a_adv);
3460 }
3461
3462 static int
3463 sctp_fs_audit(struct sctp_association *asoc)
3464 {
3465         struct sctp_tmit_chunk *chk;
3466         int inflight = 0, resend = 0, inbetween = 0, acked = 0, above = 0;
3467         int ret;
3468
3469 #ifndef INVARIANTS
3470         int entry_flight, entry_cnt;
3471
3472 #endif
3473
3474         ret = 0;
3475 #ifndef INVARIANTS
3476         entry_flight = asoc->total_flight;
3477         entry_cnt = asoc->total_flight_count;
3478 #endif
3479         if (asoc->pr_sctp_cnt >= asoc->sent_queue_cnt)
3480                 return (0);
3481
3482         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
3483                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
3484                         SCTP_PRINTF("Chk TSN:%u size:%d inflight cnt:%d\n",
3485                             chk->rec.data.TSN_seq,
3486                             chk->send_size,
3487                             chk->snd_count);
3488                         inflight++;
3489                 } else if (chk->sent == SCTP_DATAGRAM_RESEND) {
3490                         resend++;
3491                 } else if (chk->sent < SCTP_DATAGRAM_ACKED) {
3492                         inbetween++;
3493                 } else if (chk->sent > SCTP_DATAGRAM_ACKED) {
3494                         above++;
3495                 } else {
3496                         acked++;
3497                 }
3498         }
3499
3500         if ((inflight > 0) || (inbetween > 0)) {
3501 #ifdef INVARIANTS
3502                 panic("Flight size-express incorrect? \n");
3503 #else
3504                 SCTP_PRINTF("asoc->total_flight:%d cnt:%d\n",
3505                     entry_flight, entry_cnt);
3506
3507                 SCTP_PRINTF("Flight size-express incorrect F:%d I:%d R:%d Ab:%d ACK:%d\n",
3508                     inflight, inbetween, resend, above, acked);
3509                 ret = 1;
3510 #endif
3511         }
3512         return (ret);
3513 }
3514
3515
3516 static void
3517 sctp_window_probe_recovery(struct sctp_tcb *stcb,
3518     struct sctp_association *asoc,
3519     struct sctp_tmit_chunk *tp1)
3520 {
3521         tp1->window_probe = 0;
3522         if ((tp1->sent >= SCTP_DATAGRAM_ACKED) || (tp1->data == NULL)) {
3523                 /* TSN's skipped we do NOT move back. */
3524                 sctp_misc_ints(SCTP_FLIGHT_LOG_DWN_WP_FWD,
3525                     tp1->whoTo ? tp1->whoTo->flight_size : 0,
3526                     tp1->book_size,
3527                     (uintptr_t) tp1->whoTo,
3528                     tp1->rec.data.TSN_seq);
3529                 return;
3530         }
3531         /* First setup this by shrinking flight */
3532         if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) {
3533                 (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo,
3534                     tp1);
3535         }
3536         sctp_flight_size_decrease(tp1);
3537         sctp_total_flight_decrease(stcb, tp1);
3538         /* Now mark for resend */
3539         tp1->sent = SCTP_DATAGRAM_RESEND;
3540         sctp_ucount_incr(asoc->sent_queue_retran_cnt);
3541
3542         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3543                 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_WP,
3544                     tp1->whoTo->flight_size,
3545                     tp1->book_size,
3546                     (uintptr_t) tp1->whoTo,
3547                     tp1->rec.data.TSN_seq);
3548         }
3549 }
3550
3551 void
3552 sctp_express_handle_sack(struct sctp_tcb *stcb, uint32_t cumack,
3553     uint32_t rwnd, int *abort_now, int ecne_seen)
3554 {
3555         struct sctp_nets *net;
3556         struct sctp_association *asoc;
3557         struct sctp_tmit_chunk *tp1, *tp2;
3558         uint32_t old_rwnd;
3559         int win_probe_recovery = 0;
3560         int win_probe_recovered = 0;
3561         int j, done_once = 0;
3562         int rto_ok = 1;
3563
3564         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_SACK_ARRIVALS_ENABLE) {
3565                 sctp_misc_ints(SCTP_SACK_LOG_EXPRESS, cumack,
3566                     rwnd, stcb->asoc.last_acked_seq, stcb->asoc.peers_rwnd);
3567         }
3568         SCTP_TCB_LOCK_ASSERT(stcb);
3569 #ifdef SCTP_ASOCLOG_OF_TSNS
3570         stcb->asoc.cumack_log[stcb->asoc.cumack_log_at] = cumack;
3571         stcb->asoc.cumack_log_at++;
3572         if (stcb->asoc.cumack_log_at > SCTP_TSN_LOG_SIZE) {
3573                 stcb->asoc.cumack_log_at = 0;
3574         }
3575 #endif
3576         asoc = &stcb->asoc;
3577         old_rwnd = asoc->peers_rwnd;
3578         if (SCTP_TSN_GT(asoc->last_acked_seq, cumack)) {
3579                 /* old ack */
3580                 return;
3581         } else if (asoc->last_acked_seq == cumack) {
3582                 /* Window update sack */
3583                 asoc->peers_rwnd = sctp_sbspace_sub(rwnd,
3584                     (uint32_t) (asoc->total_flight + (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh))));
3585                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
3586                         /* SWS sender side engages */
3587                         asoc->peers_rwnd = 0;
3588                 }
3589                 if (asoc->peers_rwnd > old_rwnd) {
3590                         goto again;
3591                 }
3592                 return;
3593         }
3594         /* First setup for CC stuff */
3595         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
3596                 if (SCTP_TSN_GT(cumack, net->cwr_window_tsn)) {
3597                         /* Drag along the window_tsn for cwr's */
3598                         net->cwr_window_tsn = cumack;
3599                 }
3600                 net->prev_cwnd = net->cwnd;
3601                 net->net_ack = 0;
3602                 net->net_ack2 = 0;
3603
3604                 /*
3605                  * CMT: Reset CUC and Fast recovery algo variables before
3606                  * SACK processing
3607                  */
3608                 net->new_pseudo_cumack = 0;
3609                 net->will_exit_fast_recovery = 0;
3610                 if (stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack) {
3611                         (*stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack) (stcb, net);
3612                 }
3613         }
3614         if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) {
3615                 uint32_t send_s;
3616
3617                 if (!TAILQ_EMPTY(&asoc->sent_queue)) {
3618                         tp1 = TAILQ_LAST(&asoc->sent_queue,
3619                             sctpchunk_listhead);
3620                         send_s = tp1->rec.data.TSN_seq + 1;
3621                 } else {
3622                         send_s = asoc->sending_seq;
3623                 }
3624                 if (SCTP_TSN_GE(cumack, send_s)) {
3625                         struct mbuf *op_err;
3626                         char msg[SCTP_DIAG_INFO_LEN];
3627
3628                         *abort_now = 1;
3629                         /* XXX */
3630                         snprintf(msg, sizeof(msg), "Cum ack %8.8x greater or equal than TSN %8.8x",
3631                             cumack, send_s);
3632                         op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
3633                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_23;
3634                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
3635                         return;
3636                 }
3637         }
3638         asoc->this_sack_highest_gap = cumack;
3639         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
3640                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
3641                     stcb->asoc.overall_error_count,
3642                     0,
3643                     SCTP_FROM_SCTP_INDATA,
3644                     __LINE__);
3645         }
3646         stcb->asoc.overall_error_count = 0;
3647         if (SCTP_TSN_GT(cumack, asoc->last_acked_seq)) {
3648                 /* process the new consecutive TSN first */
3649                 TAILQ_FOREACH_SAFE(tp1, &asoc->sent_queue, sctp_next, tp2) {
3650                         if (SCTP_TSN_GE(cumack, tp1->rec.data.TSN_seq)) {
3651                                 if (tp1->sent == SCTP_DATAGRAM_UNSENT) {
3652                                         SCTP_PRINTF("Warning, an unsent is now acked?\n");
3653                                 }
3654                                 if (tp1->sent < SCTP_DATAGRAM_ACKED) {
3655                                         /*
3656                                          * If it is less than ACKED, it is
3657                                          * now no-longer in flight. Higher
3658                                          * values may occur during marking
3659                                          */
3660                                         if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3661                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3662                                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_CA,
3663                                                             tp1->whoTo->flight_size,
3664                                                             tp1->book_size,
3665                                                             (uintptr_t) tp1->whoTo,
3666                                                             tp1->rec.data.TSN_seq);
3667                                                 }
3668                                                 sctp_flight_size_decrease(tp1);
3669                                                 if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) {
3670                                                         (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo,
3671                                                             tp1);
3672                                                 }
3673                                                 /* sa_ignore NO_NULL_CHK */
3674                                                 sctp_total_flight_decrease(stcb, tp1);
3675                                         }
3676                                         tp1->whoTo->net_ack += tp1->send_size;
3677                                         if (tp1->snd_count < 2) {
3678                                                 /*
3679                                                  * True non-retransmited
3680                                                  * chunk
3681                                                  */
3682                                                 tp1->whoTo->net_ack2 +=
3683                                                     tp1->send_size;
3684
3685                                                 /* update RTO too? */
3686                                                 if (tp1->do_rtt) {
3687                                                         if (rto_ok) {
3688                                                                 tp1->whoTo->RTO =
3689                                                                 /*
3690                                                                  * sa_ignore
3691                                                                  * NO_NULL_CH
3692                                                                  * K
3693                                                                  */
3694                                                                     sctp_calculate_rto(stcb,
3695                                                                     asoc, tp1->whoTo,
3696                                                                     &tp1->sent_rcv_time,
3697                                                                     sctp_align_safe_nocopy,
3698                                                                     SCTP_RTT_FROM_DATA);
3699                                                                 rto_ok = 0;
3700                                                         }
3701                                                         if (tp1->whoTo->rto_needed == 0) {
3702                                                                 tp1->whoTo->rto_needed = 1;
3703                                                         }
3704                                                         tp1->do_rtt = 0;
3705                                                 }
3706                                         }
3707                                         /*
3708                                          * CMT: CUCv2 algorithm. From the
3709                                          * cumack'd TSNs, for each TSN being
3710                                          * acked for the first time, set the
3711                                          * following variables for the
3712                                          * corresp destination.
3713                                          * new_pseudo_cumack will trigger a
3714                                          * cwnd update.
3715                                          * find_(rtx_)pseudo_cumack will
3716                                          * trigger search for the next
3717                                          * expected (rtx-)pseudo-cumack.
3718                                          */
3719                                         tp1->whoTo->new_pseudo_cumack = 1;
3720                                         tp1->whoTo->find_pseudo_cumack = 1;
3721                                         tp1->whoTo->find_rtx_pseudo_cumack = 1;
3722
3723                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
3724                                                 /* sa_ignore NO_NULL_CHK */
3725                                                 sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK);
3726                                         }
3727                                 }
3728                                 if (tp1->sent == SCTP_DATAGRAM_RESEND) {
3729                                         sctp_ucount_decr(asoc->sent_queue_retran_cnt);
3730                                 }
3731                                 if (tp1->rec.data.chunk_was_revoked) {
3732                                         /* deflate the cwnd */
3733                                         tp1->whoTo->cwnd -= tp1->book_size;
3734                                         tp1->rec.data.chunk_was_revoked = 0;
3735                                 }
3736                                 if (tp1->sent != SCTP_DATAGRAM_NR_ACKED) {
3737                                         if (asoc->strmout[tp1->rec.data.stream_number].chunks_on_queues > 0) {
3738                                                 asoc->strmout[tp1->rec.data.stream_number].chunks_on_queues--;
3739 #ifdef INVARIANTS
3740                                         } else {
3741                                                 panic("No chunks on the queues for sid %u.", tp1->rec.data.stream_number);
3742 #endif
3743                                         }
3744                                 }
3745                                 TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next);
3746                                 if (tp1->data) {
3747                                         /* sa_ignore NO_NULL_CHK */
3748                                         sctp_free_bufspace(stcb, asoc, tp1, 1);
3749                                         sctp_m_freem(tp1->data);
3750                                         tp1->data = NULL;
3751                                 }
3752                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
3753                                         sctp_log_sack(asoc->last_acked_seq,
3754                                             cumack,
3755                                             tp1->rec.data.TSN_seq,
3756                                             0,
3757                                             0,
3758                                             SCTP_LOG_FREE_SENT);
3759                                 }
3760                                 asoc->sent_queue_cnt--;
3761                                 sctp_free_a_chunk(stcb, tp1, SCTP_SO_NOT_LOCKED);
3762                         } else {
3763                                 break;
3764                         }
3765                 }
3766
3767         }
3768         /* sa_ignore NO_NULL_CHK */
3769         if (stcb->sctp_socket) {
3770 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3771                 struct socket *so;
3772
3773 #endif
3774                 SOCKBUF_LOCK(&stcb->sctp_socket->so_snd);
3775                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) {
3776                         /* sa_ignore NO_NULL_CHK */
3777                         sctp_wakeup_log(stcb, 1, SCTP_WAKESND_FROM_SACK);
3778                 }
3779 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3780                 so = SCTP_INP_SO(stcb->sctp_ep);
3781                 atomic_add_int(&stcb->asoc.refcnt, 1);
3782                 SCTP_TCB_UNLOCK(stcb);
3783                 SCTP_SOCKET_LOCK(so, 1);
3784                 SCTP_TCB_LOCK(stcb);
3785                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
3786                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
3787                         /* assoc was freed while we were unlocked */
3788                         SCTP_SOCKET_UNLOCK(so, 1);
3789                         return;
3790                 }
3791 #endif
3792                 sctp_sowwakeup_locked(stcb->sctp_ep, stcb->sctp_socket);
3793 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3794                 SCTP_SOCKET_UNLOCK(so, 1);
3795 #endif
3796         } else {
3797                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) {
3798                         sctp_wakeup_log(stcb, 1, SCTP_NOWAKE_FROM_SACK);
3799                 }
3800         }
3801
3802         /* JRS - Use the congestion control given in the CC module */
3803         if ((asoc->last_acked_seq != cumack) && (ecne_seen == 0)) {
3804                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
3805                         if (net->net_ack2 > 0) {
3806                                 /*
3807                                  * Karn's rule applies to clearing error
3808                                  * count, this is optional.
3809                                  */
3810                                 net->error_count = 0;
3811                                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
3812                                         /* addr came good */
3813                                         net->dest_state |= SCTP_ADDR_REACHABLE;
3814                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
3815                                             0, (void *)net, SCTP_SO_NOT_LOCKED);
3816                                 }
3817                                 if (net == stcb->asoc.primary_destination) {
3818                                         if (stcb->asoc.alternate) {
3819                                                 /*
3820                                                  * release the alternate,
3821                                                  * primary is good
3822                                                  */
3823                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3824                                                 stcb->asoc.alternate = NULL;
3825                                         }
3826                                 }
3827                                 if (net->dest_state & SCTP_ADDR_PF) {
3828                                         net->dest_state &= ~SCTP_ADDR_PF;
3829                                         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT,
3830                                             stcb->sctp_ep, stcb, net,
3831                                             SCTP_FROM_SCTP_INDATA + SCTP_LOC_24);
3832                                         sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
3833                                         asoc->cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
3834                                         /* Done with this net */
3835                                         net->net_ack = 0;
3836                                 }
3837                                 /* restore any doubled timers */
3838                                 net->RTO = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv;
3839                                 if (net->RTO < stcb->asoc.minrto) {
3840                                         net->RTO = stcb->asoc.minrto;
3841                                 }
3842                                 if (net->RTO > stcb->asoc.maxrto) {
3843                                         net->RTO = stcb->asoc.maxrto;
3844                                 }
3845                         }
3846                 }
3847                 asoc->cc_functions.sctp_cwnd_update_after_sack(stcb, asoc, 1, 0, 0);
3848         }
3849         asoc->last_acked_seq = cumack;
3850
3851         if (TAILQ_EMPTY(&asoc->sent_queue)) {
3852                 /* nothing left in-flight */
3853                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
3854                         net->flight_size = 0;
3855                         net->partial_bytes_acked = 0;
3856                 }
3857                 asoc->total_flight = 0;
3858                 asoc->total_flight_count = 0;
3859         }
3860         /* RWND update */
3861         asoc->peers_rwnd = sctp_sbspace_sub(rwnd,
3862             (uint32_t) (asoc->total_flight + (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh))));
3863         if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
3864                 /* SWS sender side engages */
3865                 asoc->peers_rwnd = 0;
3866         }
3867         if (asoc->peers_rwnd > old_rwnd) {
3868                 win_probe_recovery = 1;
3869         }
3870         /* Now assure a timer where data is queued at */
3871 again:
3872         j = 0;
3873         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
3874                 int to_ticks;
3875
3876                 if (win_probe_recovery && (net->window_probe)) {
3877                         win_probe_recovered = 1;
3878                         /*
3879                          * Find first chunk that was used with window probe
3880                          * and clear the sent
3881                          */
3882                         /* sa_ignore FREED_MEMORY */
3883                         TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
3884                                 if (tp1->window_probe) {
3885                                         /* move back to data send queue */
3886                                         sctp_window_probe_recovery(stcb, asoc, tp1);
3887                                         break;
3888                                 }
3889                         }
3890                 }
3891                 if (net->RTO == 0) {
3892                         to_ticks = MSEC_TO_TICKS(stcb->asoc.initial_rto);
3893                 } else {
3894                         to_ticks = MSEC_TO_TICKS(net->RTO);
3895                 }
3896                 if (net->flight_size) {
3897                         j++;
3898                         (void)SCTP_OS_TIMER_START(&net->rxt_timer.timer, to_ticks,
3899                             sctp_timeout_handler, &net->rxt_timer);
3900                         if (net->window_probe) {
3901                                 net->window_probe = 0;
3902                         }
3903                 } else {
3904                         if (net->window_probe) {
3905                                 /*
3906                                  * In window probes we must assure a timer
3907                                  * is still running there
3908                                  */
3909                                 net->window_probe = 0;
3910                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
3911                                         SCTP_OS_TIMER_START(&net->rxt_timer.timer, to_ticks,
3912                                             sctp_timeout_handler, &net->rxt_timer);
3913                                 }
3914                         } else if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
3915                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3916                                     stcb, net,
3917                                     SCTP_FROM_SCTP_INDATA + SCTP_LOC_25);
3918                         }
3919                 }
3920         }
3921         if ((j == 0) &&
3922             (!TAILQ_EMPTY(&asoc->sent_queue)) &&
3923             (asoc->sent_queue_retran_cnt == 0) &&
3924             (win_probe_recovered == 0) &&
3925             (done_once == 0)) {
3926                 /*
3927                  * huh, this should not happen unless all packets are
3928                  * PR-SCTP and marked to skip of course.
3929                  */
3930                 if (sctp_fs_audit(asoc)) {
3931                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
3932                                 net->flight_size = 0;
3933                         }
3934                         asoc->total_flight = 0;
3935                         asoc->total_flight_count = 0;
3936                         asoc->sent_queue_retran_cnt = 0;
3937                         TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
3938                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3939                                         sctp_flight_size_increase(tp1);
3940                                         sctp_total_flight_increase(stcb, tp1);
3941                                 } else if (tp1->sent == SCTP_DATAGRAM_RESEND) {
3942                                         sctp_ucount_incr(asoc->sent_queue_retran_cnt);
3943                                 }
3944                         }
3945                 }
3946                 done_once = 1;
3947                 goto again;
3948         }
3949         /**********************************/
3950         /* Now what about shutdown issues */
3951         /**********************************/
3952         if (TAILQ_EMPTY(&asoc->send_queue) && TAILQ_EMPTY(&asoc->sent_queue)) {
3953                 /* nothing left on sendqueue.. consider done */
3954                 /* clean up */
3955                 if ((asoc->stream_queue_cnt == 1) &&
3956                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
3957                     (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED)) &&
3958                     (asoc->locked_on_sending)
3959                     ) {
3960                         struct sctp_stream_queue_pending *sp;
3961
3962                         /*
3963                          * I may be in a state where we got all across.. but
3964                          * cannot write more due to a shutdown... we abort
3965                          * since the user did not indicate EOR in this case.
3966                          * The sp will be cleaned during free of the asoc.
3967                          */
3968                         sp = TAILQ_LAST(&((asoc->locked_on_sending)->outqueue),
3969                             sctp_streamhead);
3970                         if ((sp) && (sp->length == 0)) {
3971                                 /* Let cleanup code purge it */
3972                                 if (sp->msg_is_complete) {
3973                                         asoc->stream_queue_cnt--;
3974                                 } else {
3975                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
3976                                         asoc->locked_on_sending = NULL;
3977                                         asoc->stream_queue_cnt--;
3978                                 }
3979                         }
3980                 }
3981                 if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) &&
3982                     (asoc->stream_queue_cnt == 0)) {
3983                         if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) {
3984                                 /* Need to abort here */
3985                                 struct mbuf *op_err;
3986
3987                 abort_out_now:
3988                                 *abort_now = 1;
3989                                 /* XXX */
3990                                 op_err = sctp_generate_cause(SCTP_CAUSE_USER_INITIATED_ABT, "");
3991                                 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_26;
3992                                 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
3993                         } else {
3994                                 struct sctp_nets *netp;
3995
3996                                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
3997                                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
3998                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
3999                                 }
4000                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
4001                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
4002                                 sctp_stop_timers_for_shutdown(stcb);
4003                                 if (asoc->alternate) {
4004                                         netp = asoc->alternate;
4005                                 } else {
4006                                         netp = asoc->primary_destination;
4007                                 }
4008                                 sctp_send_shutdown(stcb, netp);
4009                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
4010                                     stcb->sctp_ep, stcb, netp);
4011                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
4012                                     stcb->sctp_ep, stcb, netp);
4013                         }
4014                 } else if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) &&
4015                     (asoc->stream_queue_cnt == 0)) {
4016                         struct sctp_nets *netp;
4017
4018                         if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) {
4019                                 goto abort_out_now;
4020                         }
4021                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
4022                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
4023                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
4024                         sctp_stop_timers_for_shutdown(stcb);
4025                         if (asoc->alternate) {
4026                                 netp = asoc->alternate;
4027                         } else {
4028                                 netp = asoc->primary_destination;
4029                         }
4030                         sctp_send_shutdown_ack(stcb, netp);
4031                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
4032                             stcb->sctp_ep, stcb, netp);
4033                 }
4034         }
4035         /*********************************************/
4036         /* Here we perform PR-SCTP procedures        */
4037         /* (section 4.2)                             */
4038         /*********************************************/
4039         /* C1. update advancedPeerAckPoint */
4040         if (SCTP_TSN_GT(cumack, asoc->advanced_peer_ack_point)) {
4041                 asoc->advanced_peer_ack_point = cumack;
4042         }
4043         /* PR-Sctp issues need to be addressed too */
4044         if ((asoc->prsctp_supported) && (asoc->pr_sctp_cnt > 0)) {
4045                 struct sctp_tmit_chunk *lchk;
4046                 uint32_t old_adv_peer_ack_point;
4047
4048                 old_adv_peer_ack_point = asoc->advanced_peer_ack_point;
4049                 lchk = sctp_try_advance_peer_ack_point(stcb, asoc);
4050                 /* C3. See if we need to send a Fwd-TSN */
4051                 if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, cumack)) {
4052                         /*
4053                          * ISSUE with ECN, see FWD-TSN processing.
4054                          */
4055                         if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, old_adv_peer_ack_point)) {
4056                                 send_forward_tsn(stcb, asoc);
4057                         } else if (lchk) {
4058                                 /* try to FR fwd-tsn's that get lost too */
4059                                 if (lchk->rec.data.fwd_tsn_cnt >= 3) {
4060                                         send_forward_tsn(stcb, asoc);
4061                                 }
4062                         }
4063                 }
4064                 if (lchk) {
4065                         /* Assure a timer is up */
4066                         sctp_timer_start(SCTP_TIMER_TYPE_SEND,
4067                             stcb->sctp_ep, stcb, lchk->whoTo);
4068                 }
4069         }
4070         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_RWND_LOGGING_ENABLE) {
4071                 sctp_misc_ints(SCTP_SACK_RWND_UPDATE,
4072                     rwnd,
4073                     stcb->asoc.peers_rwnd,
4074                     stcb->asoc.total_flight,
4075                     stcb->asoc.total_output_queue_size);
4076         }
4077 }
4078
4079 void
4080 sctp_handle_sack(struct mbuf *m, int offset_seg, int offset_dup,
4081     struct sctp_tcb *stcb,
4082     uint16_t num_seg, uint16_t num_nr_seg, uint16_t num_dup,
4083     int *abort_now, uint8_t flags,
4084     uint32_t cum_ack, uint32_t rwnd, int ecne_seen)
4085 {
4086         struct sctp_association *asoc;
4087         struct sctp_tmit_chunk *tp1, *tp2;
4088         uint32_t last_tsn, biggest_tsn_acked, biggest_tsn_newly_acked, this_sack_lowest_newack;
4089         uint16_t wake_him = 0;
4090         uint32_t send_s = 0;
4091         long j;
4092         int accum_moved = 0;
4093         int will_exit_fast_recovery = 0;
4094         uint32_t a_rwnd, old_rwnd;
4095         int win_probe_recovery = 0;
4096         int win_probe_recovered = 0;
4097         struct sctp_nets *net = NULL;
4098         int done_once;
4099         int rto_ok = 1;
4100         uint8_t reneged_all = 0;
4101         uint8_t cmt_dac_flag;
4102
4103         /*
4104          * we take any chance we can to service our queues since we cannot
4105          * get awoken when the socket is read from :<
4106          */
4107         /*
4108          * Now perform the actual SACK handling: 1) Verify that it is not an
4109          * old sack, if so discard. 2) If there is nothing left in the send
4110          * queue (cum-ack is equal to last acked) then you have a duplicate
4111          * too, update any rwnd change and verify no timers are running.
4112          * then return. 3) Process any new consequtive data i.e. cum-ack
4113          * moved process these first and note that it moved. 4) Process any
4114          * sack blocks. 5) Drop any acked from the queue. 6) Check for any
4115          * revoked blocks and mark. 7) Update the cwnd. 8) Nothing left,
4116          * sync up flightsizes and things, stop all timers and also check
4117          * for shutdown_pending state. If so then go ahead and send off the
4118          * shutdown. If in shutdown recv, send off the shutdown-ack and
4119          * start that timer, Ret. 9) Strike any non-acked things and do FR
4120          * procedure if needed being sure to set the FR flag. 10) Do pr-sctp
4121          * procedures. 11) Apply any FR penalties. 12) Assure we will SACK
4122          * if in shutdown_recv state.
4123          */
4124         SCTP_TCB_LOCK_ASSERT(stcb);
4125         /* CMT DAC algo */
4126         this_sack_lowest_newack = 0;
4127         SCTP_STAT_INCR(sctps_slowpath_sack);
4128         last_tsn = cum_ack;
4129         cmt_dac_flag = flags & SCTP_SACK_CMT_DAC;
4130 #ifdef SCTP_ASOCLOG_OF_TSNS
4131         stcb->asoc.cumack_log[stcb->asoc.cumack_log_at] = cum_ack;
4132         stcb->asoc.cumack_log_at++;
4133         if (stcb->asoc.cumack_log_at > SCTP_TSN_LOG_SIZE) {
4134                 stcb->asoc.cumack_log_at = 0;
4135         }
4136 #endif
4137         a_rwnd = rwnd;
4138
4139         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_SACK_ARRIVALS_ENABLE) {
4140                 sctp_misc_ints(SCTP_SACK_LOG_NORMAL, cum_ack,
4141                     rwnd, stcb->asoc.last_acked_seq, stcb->asoc.peers_rwnd);
4142         }
4143         old_rwnd = stcb->asoc.peers_rwnd;
4144         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4145                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4146                     stcb->asoc.overall_error_count,
4147                     0,
4148                     SCTP_FROM_SCTP_INDATA,
4149                     __LINE__);
4150         }
4151         stcb->asoc.overall_error_count = 0;
4152         asoc = &stcb->asoc;
4153         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
4154                 sctp_log_sack(asoc->last_acked_seq,
4155                     cum_ack,
4156                     0,
4157                     num_seg,
4158                     num_dup,
4159                     SCTP_LOG_NEW_SACK);
4160         }
4161         if ((num_dup) && (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE)) {
4162                 uint16_t i;
4163                 uint32_t *dupdata, dblock;
4164
4165                 for (i = 0; i < num_dup; i++) {
4166                         dupdata = (uint32_t *) sctp_m_getptr(m, offset_dup + i * sizeof(uint32_t),
4167                             sizeof(uint32_t), (uint8_t *) & dblock);
4168                         if (dupdata == NULL) {
4169                                 break;
4170                         }
4171                         sctp_log_fr(*dupdata, 0, 0, SCTP_FR_DUPED);
4172                 }
4173         }
4174         if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) {
4175                 /* reality check */
4176                 if (!TAILQ_EMPTY(&asoc->sent_queue)) {
4177                         tp1 = TAILQ_LAST(&asoc->sent_queue,
4178                             sctpchunk_listhead);
4179                         send_s = tp1->rec.data.TSN_seq + 1;
4180                 } else {
4181                         tp1 = NULL;
4182                         send_s = asoc->sending_seq;
4183                 }
4184                 if (SCTP_TSN_GE(cum_ack, send_s)) {
4185                         struct mbuf *op_err;
4186                         char msg[SCTP_DIAG_INFO_LEN];
4187
4188                         /*
4189                          * no way, we have not even sent this TSN out yet.
4190                          * Peer is hopelessly messed up with us.
4191                          */
4192                         SCTP_PRINTF("NEW cum_ack:%x send_s:%x is smaller or equal\n",
4193                             cum_ack, send_s);
4194                         if (tp1) {
4195                                 SCTP_PRINTF("Got send_s from tsn:%x + 1 of tp1:%p\n",
4196                                     tp1->rec.data.TSN_seq, (void *)tp1);
4197                         }
4198         hopeless_peer:
4199                         *abort_now = 1;
4200                         /* XXX */
4201                         snprintf(msg, sizeof(msg), "Cum ack %8.8x greater or equal than TSN %8.8x",
4202                             cum_ack, send_s);
4203                         op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
4204                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_27;
4205                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
4206                         return;
4207                 }
4208         }
4209         /**********************/
4210         /* 1) check the range */
4211         /**********************/
4212         if (SCTP_TSN_GT(asoc->last_acked_seq, last_tsn)) {
4213                 /* acking something behind */
4214                 return;
4215         }
4216         /* update the Rwnd of the peer */
4217         if (TAILQ_EMPTY(&asoc->sent_queue) &&
4218             TAILQ_EMPTY(&asoc->send_queue) &&
4219             (asoc->stream_queue_cnt == 0)) {
4220                 /* nothing left on send/sent and strmq */
4221                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
4222                         sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK,
4223                             asoc->peers_rwnd, 0, 0, a_rwnd);
4224                 }
4225                 asoc->peers_rwnd = a_rwnd;
4226                 if (asoc->sent_queue_retran_cnt) {
4227                         asoc->sent_queue_retran_cnt = 0;
4228                 }
4229                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4230                         /* SWS sender side engages */
4231                         asoc->peers_rwnd = 0;
4232                 }
4233                 /* stop any timers */
4234                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4235                         sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
4236                             stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_28);
4237                         net->partial_bytes_acked = 0;
4238                         net->flight_size = 0;
4239                 }
4240                 asoc->total_flight = 0;
4241                 asoc->total_flight_count = 0;
4242                 return;
4243         }
4244         /*
4245          * We init netAckSz and netAckSz2 to 0. These are used to track 2
4246          * things. The total byte count acked is tracked in netAckSz AND
4247          * netAck2 is used to track the total bytes acked that are un-
4248          * amibguious and were never retransmitted. We track these on a per
4249          * destination address basis.
4250          */
4251         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4252                 if (SCTP_TSN_GT(cum_ack, net->cwr_window_tsn)) {
4253                         /* Drag along the window_tsn for cwr's */
4254                         net->cwr_window_tsn = cum_ack;
4255                 }
4256                 net->prev_cwnd = net->cwnd;
4257                 net->net_ack = 0;
4258                 net->net_ack2 = 0;
4259
4260                 /*
4261                  * CMT: Reset CUC and Fast recovery algo variables before
4262                  * SACK processing
4263                  */
4264                 net->new_pseudo_cumack = 0;
4265                 net->will_exit_fast_recovery = 0;
4266                 if (stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack) {
4267                         (*stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack) (stcb, net);
4268                 }
4269         }
4270         /* process the new consecutive TSN first */
4271         TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
4272                 if (SCTP_TSN_GE(last_tsn, tp1->rec.data.TSN_seq)) {
4273                         if (tp1->sent != SCTP_DATAGRAM_UNSENT) {
4274                                 accum_moved = 1;
4275                                 if (tp1->sent < SCTP_DATAGRAM_ACKED) {
4276                                         /*
4277                                          * If it is less than ACKED, it is
4278                                          * now no-longer in flight. Higher
4279                                          * values may occur during marking
4280                                          */
4281                                         if ((tp1->whoTo->dest_state &
4282                                             SCTP_ADDR_UNCONFIRMED) &&
4283                                             (tp1->snd_count < 2)) {
4284                                                 /*
4285                                                  * If there was no retran
4286                                                  * and the address is
4287                                                  * un-confirmed and we sent
4288                                                  * there and are now
4289                                                  * sacked.. its confirmed,
4290                                                  * mark it so.
4291                                                  */
4292                                                 tp1->whoTo->dest_state &=
4293                                                     ~SCTP_ADDR_UNCONFIRMED;
4294                                         }
4295                                         if (tp1->sent < SCTP_DATAGRAM_RESEND) {
4296                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
4297                                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_CA,
4298                                                             tp1->whoTo->flight_size,
4299                                                             tp1->book_size,
4300                                                             (uintptr_t) tp1->whoTo,
4301                                                             tp1->rec.data.TSN_seq);
4302                                                 }
4303                                                 sctp_flight_size_decrease(tp1);
4304                                                 sctp_total_flight_decrease(stcb, tp1);
4305                                                 if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) {
4306                                                         (*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) (tp1->whoTo,
4307                                                             tp1);
4308                                                 }
4309                                         }
4310                                         tp1->whoTo->net_ack += tp1->send_size;
4311
4312                                         /* CMT SFR and DAC algos */
4313                                         this_sack_lowest_newack = tp1->rec.data.TSN_seq;
4314                                         tp1->whoTo->saw_newack = 1;
4315
4316                                         if (tp1->snd_count < 2) {
4317                                                 /*
4318                                                  * True non-retransmited
4319                                                  * chunk
4320                                                  */
4321                                                 tp1->whoTo->net_ack2 +=
4322                                                     tp1->send_size;
4323
4324                                                 /* update RTO too? */
4325                                                 if (tp1->do_rtt) {
4326                                                         if (rto_ok) {
4327                                                                 tp1->whoTo->RTO =
4328                                                                     sctp_calculate_rto(stcb,
4329                                                                     asoc, tp1->whoTo,
4330                                                                     &tp1->sent_rcv_time,
4331                                                                     sctp_align_safe_nocopy,
4332                                                                     SCTP_RTT_FROM_DATA);
4333                                                                 rto_ok = 0;
4334                                                         }
4335                                                         if (tp1->whoTo->rto_needed == 0) {
4336                                                                 tp1->whoTo->rto_needed = 1;
4337                                                         }
4338                                                         tp1->do_rtt = 0;
4339                                                 }
4340                                         }
4341                                         /*
4342                                          * CMT: CUCv2 algorithm. From the
4343                                          * cumack'd TSNs, for each TSN being
4344                                          * acked for the first time, set the
4345                                          * following variables for the
4346                                          * corresp destination.
4347                                          * new_pseudo_cumack will trigger a
4348                                          * cwnd update.
4349                                          * find_(rtx_)pseudo_cumack will
4350                                          * trigger search for the next
4351                                          * expected (rtx-)pseudo-cumack.
4352                                          */
4353                                         tp1->whoTo->new_pseudo_cumack = 1;
4354                                         tp1->whoTo->find_pseudo_cumack = 1;
4355                                         tp1->whoTo->find_rtx_pseudo_cumack = 1;
4356
4357
4358                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
4359                                                 sctp_log_sack(asoc->last_acked_seq,
4360                                                     cum_ack,
4361                                                     tp1->rec.data.TSN_seq,
4362                                                     0,
4363                                                     0,
4364                                                     SCTP_LOG_TSN_ACKED);
4365                                         }
4366                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
4367                                                 sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK);
4368                                         }
4369                                 }
4370                                 if (tp1->sent == SCTP_DATAGRAM_RESEND) {
4371                                         sctp_ucount_decr(asoc->sent_queue_retran_cnt);
4372 #ifdef SCTP_AUDITING_ENABLED
4373                                         sctp_audit_log(0xB3,
4374                                             (asoc->sent_queue_retran_cnt & 0x000000ff));
4375 #endif
4376                                 }
4377                                 if (tp1->rec.data.chunk_was_revoked) {
4378                                         /* deflate the cwnd */
4379                                         tp1->whoTo->cwnd -= tp1->book_size;
4380                                         tp1->rec.data.chunk_was_revoked = 0;
4381                                 }
4382                                 if (tp1->sent != SCTP_DATAGRAM_NR_ACKED) {
4383                                         tp1->sent = SCTP_DATAGRAM_ACKED;
4384                                 }
4385                         }
4386                 } else {
4387                         break;
4388                 }
4389         }
4390         biggest_tsn_newly_acked = biggest_tsn_acked = last_tsn;
4391         /* always set this up to cum-ack */
4392         asoc->this_sack_highest_gap = last_tsn;
4393
4394         if ((num_seg > 0) || (num_nr_seg > 0)) {
4395
4396                 /*
4397                  * CMT: SFR algo (and HTNA) - this_sack_highest_newack has
4398                  * to be greater than the cumack. Also reset saw_newack to 0
4399                  * for all dests.
4400                  */
4401                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4402                         net->saw_newack = 0;
4403                         net->this_sack_highest_newack = last_tsn;
4404                 }
4405
4406                 /*
4407                  * thisSackHighestGap will increase while handling NEW
4408                  * segments this_sack_highest_newack will increase while
4409                  * handling NEWLY ACKED chunks. this_sack_lowest_newack is
4410                  * used for CMT DAC algo. saw_newack will also change.
4411                  */
4412                 if (sctp_handle_segments(m, &offset_seg, stcb, asoc, last_tsn, &biggest_tsn_acked,
4413                     &biggest_tsn_newly_acked, &this_sack_lowest_newack,
4414                     num_seg, num_nr_seg, &rto_ok)) {
4415                         wake_him++;
4416                 }
4417                 if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) {
4418                         /*
4419                          * validate the biggest_tsn_acked in the gap acks if
4420                          * strict adherence is wanted.
4421                          */
4422                         if (SCTP_TSN_GE(biggest_tsn_acked, send_s)) {
4423                                 /*
4424                                  * peer is either confused or we are under
4425                                  * attack. We must abort.
4426                                  */
4427                                 SCTP_PRINTF("Hopeless peer! biggest_tsn_acked:%x largest seq:%x\n",
4428                                     biggest_tsn_acked, send_s);
4429                                 goto hopeless_peer;
4430                         }
4431                 }
4432         }
4433         /*******************************************/
4434         /* cancel ALL T3-send timer if accum moved */
4435         /*******************************************/
4436         if (asoc->sctp_cmt_on_off > 0) {
4437                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4438                         if (net->new_pseudo_cumack)
4439                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
4440                                     stcb, net,
4441                                     SCTP_FROM_SCTP_INDATA + SCTP_LOC_29);
4442
4443                 }
4444         } else {
4445                 if (accum_moved) {
4446                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4447                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
4448                                     stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_30);
4449                         }
4450                 }
4451         }
4452         /********************************************/
4453         /* drop the acked chunks from the sentqueue */
4454         /********************************************/
4455         asoc->last_acked_seq = cum_ack;
4456
4457         TAILQ_FOREACH_SAFE(tp1, &asoc->sent_queue, sctp_next, tp2) {
4458                 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, cum_ack)) {
4459                         break;
4460                 }
4461                 if (tp1->sent != SCTP_DATAGRAM_NR_ACKED) {
4462                         if (asoc->strmout[tp1->rec.data.stream_number].chunks_on_queues > 0) {
4463                                 asoc->strmout[tp1->rec.data.stream_number].chunks_on_queues--;
4464 #ifdef INVARIANTS
4465                         } else {
4466                                 panic("No chunks on the queues for sid %u.", tp1->rec.data.stream_number);
4467 #endif
4468                         }
4469                 }
4470                 TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next);
4471                 if (PR_SCTP_ENABLED(tp1->flags)) {
4472                         if (asoc->pr_sctp_cnt != 0)
4473                                 asoc->pr_sctp_cnt--;
4474                 }
4475                 asoc->sent_queue_cnt--;
4476                 if (tp1->data) {
4477                         /* sa_ignore NO_NULL_CHK */
4478                         sctp_free_bufspace(stcb, asoc, tp1, 1);
4479                         sctp_m_freem(tp1->data);
4480                         tp1->data = NULL;
4481                         if (asoc->prsctp_supported && PR_SCTP_BUF_ENABLED(tp1->flags)) {
4482                                 asoc->sent_queue_cnt_removeable--;
4483                         }
4484                 }
4485                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
4486                         sctp_log_sack(asoc->last_acked_seq,
4487                             cum_ack,
4488                             tp1->rec.data.TSN_seq,
4489                             0,
4490                             0,
4491                             SCTP_LOG_FREE_SENT);
4492                 }
4493                 sctp_free_a_chunk(stcb, tp1, SCTP_SO_NOT_LOCKED);
4494                 wake_him++;
4495         }
4496         if (TAILQ_EMPTY(&asoc->sent_queue) && (asoc->total_flight > 0)) {
4497 #ifdef INVARIANTS
4498                 panic("Warning flight size is postive and should be 0");
4499 #else
4500                 SCTP_PRINTF("Warning flight size incorrect should be 0 is %d\n",
4501                     asoc->total_flight);
4502 #endif
4503                 asoc->total_flight = 0;
4504         }
4505         /* sa_ignore NO_NULL_CHK */
4506         if ((wake_him) && (stcb->sctp_socket)) {
4507 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4508                 struct socket *so;
4509
4510 #endif
4511                 SOCKBUF_LOCK(&stcb->sctp_socket->so_snd);
4512                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) {
4513                         sctp_wakeup_log(stcb, wake_him, SCTP_WAKESND_FROM_SACK);
4514                 }
4515 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4516                 so = SCTP_INP_SO(stcb->sctp_ep);
4517                 atomic_add_int(&stcb->asoc.refcnt, 1);
4518                 SCTP_TCB_UNLOCK(stcb);
4519                 SCTP_SOCKET_LOCK(so, 1);
4520                 SCTP_TCB_LOCK(stcb);
4521                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4522                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
4523                         /* assoc was freed while we were unlocked */
4524                         SCTP_SOCKET_UNLOCK(so, 1);
4525                         return;
4526                 }
4527 #endif
4528                 sctp_sowwakeup_locked(stcb->sctp_ep, stcb->sctp_socket);
4529 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4530                 SCTP_SOCKET_UNLOCK(so, 1);
4531 #endif
4532         } else {
4533                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) {
4534                         sctp_wakeup_log(stcb, wake_him, SCTP_NOWAKE_FROM_SACK);
4535                 }
4536         }
4537
4538         if (asoc->fast_retran_loss_recovery && accum_moved) {
4539                 if (SCTP_TSN_GE(asoc->last_acked_seq, asoc->fast_recovery_tsn)) {
4540                         /* Setup so we will exit RFC2582 fast recovery */
4541                         will_exit_fast_recovery = 1;
4542                 }
4543         }
4544         /*
4545          * Check for revoked fragments:
4546          *
4547          * if Previous sack - Had no frags then we can't have any revoked if
4548          * Previous sack - Had frag's then - If we now have frags aka
4549          * num_seg > 0 call sctp_check_for_revoked() to tell if peer revoked
4550          * some of them. else - The peer revoked all ACKED fragments, since
4551          * we had some before and now we have NONE.
4552          */
4553
4554         if (num_seg) {
4555                 sctp_check_for_revoked(stcb, asoc, cum_ack, biggest_tsn_acked);
4556                 asoc->saw_sack_with_frags = 1;
4557         } else if (asoc->saw_sack_with_frags) {
4558                 int cnt_revoked = 0;
4559
4560                 /* Peer revoked all dg's marked or acked */
4561                 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
4562                         if (tp1->sent == SCTP_DATAGRAM_ACKED) {
4563                                 tp1->sent = SCTP_DATAGRAM_SENT;
4564                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
4565                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_REVOKE,
4566                                             tp1->whoTo->flight_size,
4567                                             tp1->book_size,
4568                                             (uintptr_t) tp1->whoTo,
4569                                             tp1->rec.data.TSN_seq);
4570                                 }
4571                                 sctp_flight_size_increase(tp1);
4572                                 sctp_total_flight_increase(stcb, tp1);
4573                                 tp1->rec.data.chunk_was_revoked = 1;
4574                                 /*
4575                                  * To ensure that this increase in
4576                                  * flightsize, which is artificial, does not
4577                                  * throttle the sender, we also increase the
4578                                  * cwnd artificially.
4579                                  */
4580                                 tp1->whoTo->cwnd += tp1->book_size;
4581                                 cnt_revoked++;
4582                         }
4583                 }
4584                 if (cnt_revoked) {
4585                         reneged_all = 1;
4586                 }
4587                 asoc->saw_sack_with_frags = 0;
4588         }
4589         if (num_nr_seg > 0)
4590                 asoc->saw_sack_with_nr_frags = 1;
4591         else
4592                 asoc->saw_sack_with_nr_frags = 0;
4593
4594         /* JRS - Use the congestion control given in the CC module */
4595         if (ecne_seen == 0) {
4596                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4597                         if (net->net_ack2 > 0) {
4598                                 /*
4599                                  * Karn's rule applies to clearing error
4600                                  * count, this is optional.
4601                                  */
4602                                 net->error_count = 0;
4603                                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
4604                                         /* addr came good */
4605                                         net->dest_state |= SCTP_ADDR_REACHABLE;
4606                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
4607                                             0, (void *)net, SCTP_SO_NOT_LOCKED);
4608                                 }
4609                                 if (net == stcb->asoc.primary_destination) {
4610                                         if (stcb->asoc.alternate) {
4611                                                 /*
4612                                                  * release the alternate,
4613                                                  * primary is good
4614                                                  */
4615                                                 sctp_free_remote_addr(stcb->asoc.alternate);
4616                                                 stcb->asoc.alternate = NULL;
4617                                         }
4618                                 }
4619                                 if (net->dest_state & SCTP_ADDR_PF) {
4620                                         net->dest_state &= ~SCTP_ADDR_PF;
4621                                         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT,
4622                                             stcb->sctp_ep, stcb, net,
4623                                             SCTP_FROM_SCTP_INDATA + SCTP_LOC_31);
4624                                         sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
4625                                         asoc->cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
4626                                         /* Done with this net */
4627                                         net->net_ack = 0;
4628                                 }
4629                                 /* restore any doubled timers */
4630                                 net->RTO = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv;
4631                                 if (net->RTO < stcb->asoc.minrto) {
4632                                         net->RTO = stcb->asoc.minrto;
4633                                 }
4634                                 if (net->RTO > stcb->asoc.maxrto) {
4635                                         net->RTO = stcb->asoc.maxrto;
4636                                 }
4637                         }
4638                 }
4639                 asoc->cc_functions.sctp_cwnd_update_after_sack(stcb, asoc, accum_moved, reneged_all, will_exit_fast_recovery);
4640         }
4641         if (TAILQ_EMPTY(&asoc->sent_queue)) {
4642                 /* nothing left in-flight */
4643                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4644                         /* stop all timers */
4645                         sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
4646                             stcb, net,
4647                             SCTP_FROM_SCTP_INDATA + SCTP_LOC_32);
4648                         net->flight_size = 0;
4649                         net->partial_bytes_acked = 0;
4650                 }
4651                 asoc->total_flight = 0;
4652                 asoc->total_flight_count = 0;
4653         }
4654         /**********************************/
4655         /* Now what about shutdown issues */
4656         /**********************************/
4657         if (TAILQ_EMPTY(&asoc->send_queue) && TAILQ_EMPTY(&asoc->sent_queue)) {
4658                 /* nothing left on sendqueue.. consider done */
4659                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
4660                         sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK,
4661                             asoc->peers_rwnd, 0, 0, a_rwnd);
4662                 }
4663                 asoc->peers_rwnd = a_rwnd;
4664                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4665                         /* SWS sender side engages */
4666                         asoc->peers_rwnd = 0;
4667                 }
4668                 /* clean up */
4669                 if ((asoc->stream_queue_cnt == 1) &&
4670                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
4671                     (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED)) &&
4672                     (asoc->locked_on_sending)
4673                     ) {
4674                         struct sctp_stream_queue_pending *sp;
4675
4676                         /*
4677                          * I may be in a state where we got all across.. but
4678                          * cannot write more due to a shutdown... we abort
4679                          * since the user did not indicate EOR in this case.
4680                          */
4681                         sp = TAILQ_LAST(&((asoc->locked_on_sending)->outqueue),
4682                             sctp_streamhead);
4683                         if ((sp) && (sp->length == 0)) {
4684                                 asoc->locked_on_sending = NULL;
4685                                 if (sp->msg_is_complete) {
4686                                         asoc->stream_queue_cnt--;
4687                                 } else {
4688                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
4689                                         asoc->stream_queue_cnt--;
4690                                 }
4691                         }
4692                 }
4693                 if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) &&
4694                     (asoc->stream_queue_cnt == 0)) {
4695                         if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) {
4696                                 /* Need to abort here */
4697                                 struct mbuf *op_err;
4698
4699                 abort_out_now:
4700                                 *abort_now = 1;
4701                                 /* XXX */
4702                                 op_err = sctp_generate_cause(SCTP_CAUSE_USER_INITIATED_ABT, "");
4703                                 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_33;
4704                                 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
4705                                 return;
4706                         } else {
4707                                 struct sctp_nets *netp;
4708
4709                                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
4710                                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
4711                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
4712                                 }
4713                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
4714                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
4715                                 sctp_stop_timers_for_shutdown(stcb);
4716                                 if (asoc->alternate) {
4717                                         netp = asoc->alternate;
4718                                 } else {
4719                                         netp = asoc->primary_destination;
4720                                 }
4721                                 sctp_send_shutdown(stcb, netp);
4722                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
4723                                     stcb->sctp_ep, stcb, netp);
4724                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
4725                                     stcb->sctp_ep, stcb, netp);
4726                         }
4727                         return;
4728                 } else if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) &&
4729                     (asoc->stream_queue_cnt == 0)) {
4730                         struct sctp_nets *netp;
4731
4732                         if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) {
4733                                 goto abort_out_now;
4734                         }
4735                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
4736                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
4737                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
4738                         sctp_stop_timers_for_shutdown(stcb);
4739                         if (asoc->alternate) {
4740                                 netp = asoc->alternate;
4741                         } else {
4742                                 netp = asoc->primary_destination;
4743                         }
4744                         sctp_send_shutdown_ack(stcb, netp);
4745                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
4746                             stcb->sctp_ep, stcb, netp);
4747                         return;
4748                 }
4749         }
4750         /*
4751          * Now here we are going to recycle net_ack for a different use...
4752          * HEADS UP.
4753          */
4754         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4755                 net->net_ack = 0;
4756         }
4757
4758         /*
4759          * CMT DAC algorithm: If SACK DAC flag was 0, then no extra marking
4760          * to be done. Setting this_sack_lowest_newack to the cum_ack will
4761          * automatically ensure that.
4762          */
4763         if ((asoc->sctp_cmt_on_off > 0) &&
4764             SCTP_BASE_SYSCTL(sctp_cmt_use_dac) &&
4765             (cmt_dac_flag == 0)) {
4766                 this_sack_lowest_newack = cum_ack;
4767         }
4768         if ((num_seg > 0) || (num_nr_seg > 0)) {
4769                 sctp_strike_gap_ack_chunks(stcb, asoc, biggest_tsn_acked,
4770                     biggest_tsn_newly_acked, this_sack_lowest_newack, accum_moved);
4771         }
4772         /* JRS - Use the congestion control given in the CC module */
4773         asoc->cc_functions.sctp_cwnd_update_after_fr(stcb, asoc);
4774
4775         /* Now are we exiting loss recovery ? */
4776         if (will_exit_fast_recovery) {
4777                 /* Ok, we must exit fast recovery */
4778                 asoc->fast_retran_loss_recovery = 0;
4779         }
4780         if ((asoc->sat_t3_loss_recovery) &&
4781             SCTP_TSN_GE(asoc->last_acked_seq, asoc->sat_t3_recovery_tsn)) {
4782                 /* end satellite t3 loss recovery */
4783                 asoc->sat_t3_loss_recovery = 0;
4784         }
4785         /*
4786          * CMT Fast recovery
4787          */
4788         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4789                 if (net->will_exit_fast_recovery) {
4790                         /* Ok, we must exit fast recovery */
4791                         net->fast_retran_loss_recovery = 0;
4792                 }
4793         }
4794
4795         /* Adjust and set the new rwnd value */
4796         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
4797                 sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK,
4798                     asoc->peers_rwnd, asoc->total_flight, (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)), a_rwnd);
4799         }
4800         asoc->peers_rwnd = sctp_sbspace_sub(a_rwnd,
4801             (uint32_t) (asoc->total_flight + (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh))));
4802         if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4803                 /* SWS sender side engages */
4804                 asoc->peers_rwnd = 0;
4805         }
4806         if (asoc->peers_rwnd > old_rwnd) {
4807                 win_probe_recovery = 1;
4808         }
4809         /*
4810          * Now we must setup so we have a timer up for anyone with
4811          * outstanding data.
4812          */
4813         done_once = 0;
4814 again:
4815         j = 0;
4816         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4817                 if (win_probe_recovery && (net->window_probe)) {
4818                         win_probe_recovered = 1;
4819                         /*-
4820                          * Find first chunk that was used with
4821                          * window probe and clear the event. Put
4822                          * it back into the send queue as if has
4823                          * not been sent.
4824                          */
4825                         TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
4826                                 if (tp1->window_probe) {
4827                                         sctp_window_probe_recovery(stcb, asoc, tp1);
4828                                         break;
4829                                 }
4830                         }
4831                 }
4832                 if (net->flight_size) {
4833                         j++;
4834                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4835                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND,
4836                                     stcb->sctp_ep, stcb, net);
4837                         }
4838                         if (net->window_probe) {
4839                                 net->window_probe = 0;
4840                         }
4841                 } else {
4842                         if (net->window_probe) {
4843                                 /*
4844                                  * In window probes we must assure a timer
4845                                  * is still running there
4846                                  */
4847                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4848                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND,
4849                                             stcb->sctp_ep, stcb, net);
4850
4851                                 }
4852                         } else if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4853                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
4854                                     stcb, net,
4855                                     SCTP_FROM_SCTP_INDATA + SCTP_LOC_34);
4856                         }
4857                 }
4858         }
4859         if ((j == 0) &&
4860             (!TAILQ_EMPTY(&asoc->sent_queue)) &&
4861             (asoc->sent_queue_retran_cnt == 0) &&
4862             (win_probe_recovered == 0) &&
4863             (done_once == 0)) {
4864                 /*
4865                  * huh, this should not happen unless all packets are
4866                  * PR-SCTP and marked to skip of course.
4867                  */
4868                 if (sctp_fs_audit(asoc)) {
4869                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4870                                 net->flight_size = 0;
4871                         }
4872                         asoc->total_flight = 0;
4873                         asoc->total_flight_count = 0;
4874                         asoc->sent_queue_retran_cnt = 0;
4875                         TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
4876                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
4877                                         sctp_flight_size_increase(tp1);
4878                                         sctp_total_flight_increase(stcb, tp1);
4879                                 } else if (tp1->sent == SCTP_DATAGRAM_RESEND) {
4880                                         sctp_ucount_incr(asoc->sent_queue_retran_cnt);
4881                                 }
4882                         }
4883                 }
4884                 done_once = 1;
4885                 goto again;
4886         }
4887         /*********************************************/
4888         /* Here we perform PR-SCTP procedures        */
4889         /* (section 4.2)                             */
4890         /*********************************************/
4891         /* C1. update advancedPeerAckPoint */
4892         if (SCTP_TSN_GT(cum_ack, asoc->advanced_peer_ack_point)) {
4893                 asoc->advanced_peer_ack_point = cum_ack;
4894         }
4895         /* C2. try to further move advancedPeerAckPoint ahead */
4896         if ((asoc->prsctp_supported) && (asoc->pr_sctp_cnt > 0)) {
4897                 struct sctp_tmit_chunk *lchk;
4898                 uint32_t old_adv_peer_ack_point;
4899
4900                 old_adv_peer_ack_point = asoc->advanced_peer_ack_point;
4901                 lchk = sctp_try_advance_peer_ack_point(stcb, asoc);
4902                 /* C3. See if we need to send a Fwd-TSN */
4903                 if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, cum_ack)) {
4904                         /*
4905                          * ISSUE with ECN, see FWD-TSN processing.
4906                          */
4907                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
4908                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
4909                                     0xee, cum_ack, asoc->advanced_peer_ack_point,
4910                                     old_adv_peer_ack_point);
4911                         }
4912                         if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, old_adv_peer_ack_point)) {
4913                                 send_forward_tsn(stcb, asoc);
4914                         } else if (lchk) {
4915                                 /* try to FR fwd-tsn's that get lost too */
4916                                 if (lchk->rec.data.fwd_tsn_cnt >= 3) {
4917                                         send_forward_tsn(stcb, asoc);
4918                                 }
4919                         }
4920                 }
4921                 if (lchk) {
4922                         /* Assure a timer is up */
4923                         sctp_timer_start(SCTP_TIMER_TYPE_SEND,
4924                             stcb->sctp_ep, stcb, lchk->whoTo);
4925                 }
4926         }
4927         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_RWND_LOGGING_ENABLE) {
4928                 sctp_misc_ints(SCTP_SACK_RWND_UPDATE,
4929                     a_rwnd,
4930                     stcb->asoc.peers_rwnd,
4931                     stcb->asoc.total_flight,
4932                     stcb->asoc.total_output_queue_size);
4933         }
4934 }
4935
4936 void
4937 sctp_update_acked(struct sctp_tcb *stcb, struct sctp_shutdown_chunk *cp, int *abort_flag)
4938 {
4939         /* Copy cum-ack */
4940         uint32_t cum_ack, a_rwnd;
4941
4942         cum_ack = ntohl(cp->cumulative_tsn_ack);
4943         /* Arrange so a_rwnd does NOT change */
4944         a_rwnd = stcb->asoc.peers_rwnd + stcb->asoc.total_flight;
4945
4946         /* Now call the express sack handling */
4947         sctp_express_handle_sack(stcb, cum_ack, a_rwnd, abort_flag, 0);
4948 }
4949
4950 static void
4951 sctp_kick_prsctp_reorder_queue(struct sctp_tcb *stcb,
4952     struct sctp_stream_in *strmin)
4953 {
4954         struct sctp_queued_to_read *ctl, *nctl;
4955         struct sctp_association *asoc;
4956         uint16_t tt;
4957
4958         asoc = &stcb->asoc;
4959         tt = strmin->last_sequence_delivered;
4960         /*
4961          * First deliver anything prior to and including the stream no that
4962          * came in
4963          */
4964         TAILQ_FOREACH_SAFE(ctl, &strmin->inqueue, next, nctl) {
4965                 if (SCTP_SSN_GE(tt, ctl->sinfo_ssn)) {
4966                         /* this is deliverable now */
4967                         TAILQ_REMOVE(&strmin->inqueue, ctl, next);
4968                         /* subtract pending on streams */
4969                         asoc->size_on_all_streams -= ctl->length;
4970                         sctp_ucount_decr(asoc->cnt_on_all_streams);
4971                         /* deliver it to at least the delivery-q */
4972                         if (stcb->sctp_socket) {
4973                                 sctp_mark_non_revokable(asoc, ctl->sinfo_tsn);
4974                                 sctp_add_to_readq(stcb->sctp_ep, stcb,
4975                                     ctl,
4976                                     &stcb->sctp_socket->so_rcv, 1, SCTP_READ_LOCK_HELD, SCTP_SO_NOT_LOCKED);
4977                         }
4978                 } else {
4979                         /* no more delivery now. */
4980                         break;
4981                 }
4982         }
4983         /*
4984          * now we must deliver things in queue the normal way  if any are
4985          * now ready.
4986          */
4987         tt = strmin->last_sequence_delivered + 1;
4988         TAILQ_FOREACH_SAFE(ctl, &strmin->inqueue, next, nctl) {
4989                 if (tt == ctl->sinfo_ssn) {
4990                         /* this is deliverable now */
4991                         TAILQ_REMOVE(&strmin->inqueue, ctl, next);
4992                         /* subtract pending on streams */
4993                         asoc->size_on_all_streams -= ctl->length;
4994                         sctp_ucount_decr(asoc->cnt_on_all_streams);
4995                         /* deliver it to at least the delivery-q */
4996                         strmin->last_sequence_delivered = ctl->sinfo_ssn;
4997                         if (stcb->sctp_socket) {
4998                                 sctp_mark_non_revokable(asoc, ctl->sinfo_tsn);
4999                                 sctp_add_to_readq(stcb->sctp_ep, stcb,
5000                                     ctl,
5001                                     &stcb->sctp_socket->so_rcv, 1, SCTP_READ_LOCK_HELD, SCTP_SO_NOT_LOCKED);
5002
5003                         }
5004                         tt = strmin->last_sequence_delivered + 1;
5005                 } else {
5006                         break;
5007                 }
5008         }
5009 }
5010
5011 static void
5012 sctp_flush_reassm_for_str_seq(struct sctp_tcb *stcb,
5013     struct sctp_association *asoc,
5014     uint16_t stream, uint16_t seq)
5015 {
5016         struct sctp_tmit_chunk *chk, *nchk;
5017
5018         /* For each one on here see if we need to toss it */
5019         /*
5020          * For now large messages held on the reasmqueue that are complete
5021          * will be tossed too. We could in theory do more work to spin
5022          * through and stop after dumping one msg aka seeing the start of a
5023          * new msg at the head, and call the delivery function... to see if
5024          * it can be delivered... But for now we just dump everything on the
5025          * queue.
5026          */
5027         TAILQ_FOREACH_SAFE(chk, &asoc->reasmqueue, sctp_next, nchk) {
5028                 /*
5029                  * Do not toss it if on a different stream or marked for
5030                  * unordered delivery in which case the stream sequence
5031                  * number has no meaning.
5032                  */
5033                 if ((chk->rec.data.stream_number != stream) ||
5034                     ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == SCTP_DATA_UNORDERED)) {
5035                         continue;
5036                 }
5037                 if (chk->rec.data.stream_seq == seq) {
5038                         /* It needs to be tossed */
5039                         TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next);
5040                         if (SCTP_TSN_GT(chk->rec.data.TSN_seq, asoc->tsn_last_delivered)) {
5041                                 asoc->tsn_last_delivered = chk->rec.data.TSN_seq;
5042                                 asoc->str_of_pdapi = chk->rec.data.stream_number;
5043                                 asoc->ssn_of_pdapi = chk->rec.data.stream_seq;
5044                                 asoc->fragment_flags = chk->rec.data.rcv_flags;
5045                         }
5046                         asoc->size_on_reasm_queue -= chk->send_size;
5047                         sctp_ucount_decr(asoc->cnt_on_reasm_queue);
5048
5049                         /* Clear up any stream problem */
5050                         if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) != SCTP_DATA_UNORDERED &&
5051                             SCTP_SSN_GT(chk->rec.data.stream_seq, asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered)) {
5052                                 /*
5053                                  * We must dump forward this streams
5054                                  * sequence number if the chunk is not
5055                                  * unordered that is being skipped. There is
5056                                  * a chance that if the peer does not
5057                                  * include the last fragment in its FWD-TSN
5058                                  * we WILL have a problem here since you
5059                                  * would have a partial chunk in queue that
5060                                  * may not be deliverable. Also if a Partial
5061                                  * delivery API as started the user may get
5062                                  * a partial chunk. The next read returning
5063                                  * a new chunk... really ugly but I see no
5064                                  * way around it! Maybe a notify??
5065                                  */
5066                                 asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered = chk->rec.data.stream_seq;
5067                         }
5068                         if (chk->data) {
5069                                 sctp_m_freem(chk->data);
5070                                 chk->data = NULL;
5071                         }
5072                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
5073                 } else if (SCTP_SSN_GT(chk->rec.data.stream_seq, seq)) {
5074                         /*
5075                          * If the stream_seq is > than the purging one, we
5076                          * are done
5077                          */
5078                         break;
5079                 }
5080         }
5081 }
5082
5083
5084 void
5085 sctp_handle_forward_tsn(struct sctp_tcb *stcb,
5086     struct sctp_forward_tsn_chunk *fwd,
5087     int *abort_flag, struct mbuf *m, int offset)
5088 {
5089         /* The pr-sctp fwd tsn */
5090         /*
5091          * here we will perform all the data receiver side steps for
5092          * processing FwdTSN, as required in by pr-sctp draft:
5093          *
5094          * Assume we get FwdTSN(x):
5095          *
5096          * 1) update local cumTSN to x 2) try to further advance cumTSN to x +
5097          * others we have 3) examine and update re-ordering queue on
5098          * pr-in-streams 4) clean up re-assembly queue 5) Send a sack to
5099          * report where we are.
5100          */
5101         struct sctp_association *asoc;
5102         uint32_t new_cum_tsn, gap;
5103         unsigned int i, fwd_sz, m_size;
5104         uint32_t str_seq;
5105         struct sctp_stream_in *strm;
5106         struct sctp_tmit_chunk *chk, *nchk;
5107         struct sctp_queued_to_read *ctl, *sv;
5108
5109         asoc = &stcb->asoc;
5110         if ((fwd_sz = ntohs(fwd->ch.chunk_length)) < sizeof(struct sctp_forward_tsn_chunk)) {
5111                 SCTPDBG(SCTP_DEBUG_INDATA1,
5112                     "Bad size too small/big fwd-tsn\n");
5113                 return;
5114         }
5115         m_size = (stcb->asoc.mapping_array_size << 3);
5116         /*************************************************************/
5117         /* 1. Here we update local cumTSN and shift the bitmap array */
5118         /*************************************************************/
5119         new_cum_tsn = ntohl(fwd->new_cumulative_tsn);
5120
5121         if (SCTP_TSN_GE(asoc->cumulative_tsn, new_cum_tsn)) {
5122                 /* Already got there ... */
5123                 return;
5124         }
5125         /*
5126          * now we know the new TSN is more advanced, let's find the actual
5127          * gap
5128          */
5129         SCTP_CALC_TSN_TO_GAP(gap, new_cum_tsn, asoc->mapping_array_base_tsn);
5130         asoc->cumulative_tsn = new_cum_tsn;
5131         if (gap >= m_size) {
5132                 if ((long)gap > sctp_sbspace(&stcb->asoc, &stcb->sctp_socket->so_rcv)) {
5133                         struct mbuf *op_err;
5134                         char msg[SCTP_DIAG_INFO_LEN];
5135
5136                         /*
5137                          * out of range (of single byte chunks in the rwnd I
5138                          * give out). This must be an attacker.
5139                          */
5140                         *abort_flag = 1;
5141                         snprintf(msg, sizeof(msg),
5142                             "New cum ack %8.8x too high, highest TSN %8.8x",
5143                             new_cum_tsn, asoc->highest_tsn_inside_map);
5144                         op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
5145                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_35;
5146                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
5147                         return;
5148                 }
5149                 SCTP_STAT_INCR(sctps_fwdtsn_map_over);
5150
5151                 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
5152                 asoc->mapping_array_base_tsn = new_cum_tsn + 1;
5153                 asoc->highest_tsn_inside_map = new_cum_tsn;
5154
5155                 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
5156                 asoc->highest_tsn_inside_nr_map = new_cum_tsn;
5157
5158                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
5159                         sctp_log_map(0, 3, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
5160                 }
5161         } else {
5162                 SCTP_TCB_LOCK_ASSERT(stcb);
5163                 for (i = 0; i <= gap; i++) {
5164                         if (!SCTP_IS_TSN_PRESENT(asoc->mapping_array, i) &&
5165                             !SCTP_IS_TSN_PRESENT(asoc->nr_mapping_array, i)) {
5166                                 SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, i);
5167                                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn + i, asoc->highest_tsn_inside_nr_map)) {
5168                                         asoc->highest_tsn_inside_nr_map = asoc->mapping_array_base_tsn + i;
5169                                 }
5170                         }
5171                 }
5172         }
5173         /*************************************************************/
5174         /* 2. Clear up re-assembly queue                             */
5175         /*************************************************************/
5176         /*
5177          * First service it if pd-api is up, just in case we can progress it
5178          * forward
5179          */
5180         if (asoc->fragmented_delivery_inprogress) {
5181                 sctp_service_reassembly(stcb, asoc);
5182         }
5183         /* For each one on here see if we need to toss it */
5184         /*
5185          * For now large messages held on the reasmqueue that are complete
5186          * will be tossed too. We could in theory do more work to spin
5187          * through and stop after dumping one msg aka seeing the start of a
5188          * new msg at the head, and call the delivery function... to see if
5189          * it can be delivered... But for now we just dump everything on the
5190          * queue.
5191          */
5192         TAILQ_FOREACH_SAFE(chk, &asoc->reasmqueue, sctp_next, nchk) {
5193                 if (SCTP_TSN_GE(new_cum_tsn, chk->rec.data.TSN_seq)) {
5194                         /* It needs to be tossed */
5195                         TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next);
5196                         if (SCTP_TSN_GT(chk->rec.data.TSN_seq, asoc->tsn_last_delivered)) {
5197                                 asoc->tsn_last_delivered = chk->rec.data.TSN_seq;
5198                                 asoc->str_of_pdapi = chk->rec.data.stream_number;
5199                                 asoc->ssn_of_pdapi = chk->rec.data.stream_seq;
5200                                 asoc->fragment_flags = chk->rec.data.rcv_flags;
5201                         }
5202                         asoc->size_on_reasm_queue -= chk->send_size;
5203                         sctp_ucount_decr(asoc->cnt_on_reasm_queue);
5204
5205                         /* Clear up any stream problem */
5206                         if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) != SCTP_DATA_UNORDERED &&
5207                             SCTP_SSN_GT(chk->rec.data.stream_seq, asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered)) {
5208                                 /*
5209                                  * We must dump forward this streams
5210                                  * sequence number if the chunk is not
5211                                  * unordered that is being skipped. There is
5212                                  * a chance that if the peer does not
5213                                  * include the last fragment in its FWD-TSN
5214                                  * we WILL have a problem here since you
5215                                  * would have a partial chunk in queue that
5216                                  * may not be deliverable. Also if a Partial
5217                                  * delivery API as started the user may get
5218                                  * a partial chunk. The next read returning
5219                                  * a new chunk... really ugly but I see no
5220                                  * way around it! Maybe a notify??
5221                                  */
5222                                 asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered = chk->rec.data.stream_seq;
5223                         }
5224                         if (chk->data) {
5225                                 sctp_m_freem(chk->data);
5226                                 chk->data = NULL;
5227                         }
5228                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
5229                 } else {
5230                         /*
5231                          * Ok we have gone beyond the end of the fwd-tsn's
5232                          * mark.
5233                          */
5234                         break;
5235                 }
5236         }
5237         /*******************************************************/
5238         /* 3. Update the PR-stream re-ordering queues and fix  */
5239         /* delivery issues as needed.                       */
5240         /*******************************************************/
5241         fwd_sz -= sizeof(*fwd);
5242         if (m && fwd_sz) {
5243                 /* New method. */
5244                 unsigned int num_str;
5245                 struct sctp_strseq *stseq, strseqbuf;
5246
5247                 offset += sizeof(*fwd);
5248
5249                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
5250                 num_str = fwd_sz / sizeof(struct sctp_strseq);
5251                 for (i = 0; i < num_str; i++) {
5252                         uint16_t st;
5253
5254                         stseq = (struct sctp_strseq *)sctp_m_getptr(m, offset,
5255                             sizeof(struct sctp_strseq),
5256                             (uint8_t *) & strseqbuf);
5257                         offset += sizeof(struct sctp_strseq);
5258                         if (stseq == NULL) {
5259                                 break;
5260                         }
5261                         /* Convert */
5262                         st = ntohs(stseq->stream);
5263                         stseq->stream = st;
5264                         st = ntohs(stseq->sequence);
5265                         stseq->sequence = st;
5266
5267                         /* now process */
5268
5269                         /*
5270                          * Ok we now look for the stream/seq on the read
5271                          * queue where its not all delivered. If we find it
5272                          * we transmute the read entry into a PDI_ABORTED.
5273                          */
5274                         if (stseq->stream >= asoc->streamincnt) {
5275                                 /* screwed up streams, stop!  */
5276                                 break;
5277                         }
5278                         if ((asoc->str_of_pdapi == stseq->stream) &&
5279                             (asoc->ssn_of_pdapi == stseq->sequence)) {
5280                                 /*
5281                                  * If this is the one we were partially
5282                                  * delivering now then we no longer are.
5283                                  * Note this will change with the reassembly
5284                                  * re-write.
5285                                  */
5286                                 asoc->fragmented_delivery_inprogress = 0;
5287                         }
5288                         sctp_flush_reassm_for_str_seq(stcb, asoc, stseq->stream, stseq->sequence);
5289                         TAILQ_FOREACH(ctl, &stcb->sctp_ep->read_queue, next) {
5290                                 if ((ctl->sinfo_stream == stseq->stream) &&
5291                                     (ctl->sinfo_ssn == stseq->sequence)) {
5292                                         str_seq = (stseq->stream << 16) | stseq->sequence;
5293                                         ctl->end_added = 1;
5294                                         ctl->pdapi_aborted = 1;
5295                                         sv = stcb->asoc.control_pdapi;
5296                                         stcb->asoc.control_pdapi = ctl;
5297                                         sctp_ulp_notify(SCTP_NOTIFY_PARTIAL_DELVIERY_INDICATION,
5298                                             stcb,
5299                                             SCTP_PARTIAL_DELIVERY_ABORTED,
5300                                             (void *)&str_seq,
5301                                             SCTP_SO_NOT_LOCKED);
5302                                         stcb->asoc.control_pdapi = sv;
5303                                         break;
5304                                 } else if ((ctl->sinfo_stream == stseq->stream) &&
5305                                     SCTP_SSN_GT(ctl->sinfo_ssn, stseq->sequence)) {
5306                                         /* We are past our victim SSN */
5307                                         break;
5308                                 }
5309                         }
5310                         strm = &asoc->strmin[stseq->stream];
5311                         if (SCTP_SSN_GT(stseq->sequence, strm->last_sequence_delivered)) {
5312                                 /* Update the sequence number */
5313                                 strm->last_sequence_delivered = stseq->sequence;
5314                         }
5315                         /* now kick the stream the new way */
5316                         /* sa_ignore NO_NULL_CHK */
5317                         sctp_kick_prsctp_reorder_queue(stcb, strm);
5318                 }
5319                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
5320         }
5321         /*
5322          * Now slide thing forward.
5323          */
5324         sctp_slide_mapping_arrays(stcb);
5325
5326         if (!TAILQ_EMPTY(&asoc->reasmqueue)) {
5327                 /* now lets kick out and check for more fragmented delivery */
5328                 /* sa_ignore NO_NULL_CHK */
5329                 sctp_deliver_reasm_check(stcb, &stcb->asoc);
5330         }
5331 }