sys/netinet/sctp_indata.c

   1 /*-
   2  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions are met:
   6  *
   7  * a) Redistributions of source code must retain the above copyright notice,
   8  *   this list of conditions and the following disclaimer.
   9  *
  10  * b) Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in
  12  *   the documentation and/or other materials provided with the distribution.
  13  *
  14  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  15  *    contributors may be used to endorse or promote products derived
  16  *    from this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  20  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  22  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  28  * THE POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31 /* $KAME: sctp_indata.c,v 1.36 2005/03/06 16:04:17 itojun Exp $  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <netinet/sctp_os.h>
  37 #include <netinet/sctp_var.h>
  38 #include <netinet/sctp_sysctl.h>
  39 #include <netinet/sctp_pcb.h>
  40 #include <netinet/sctp_header.h>
  41 #include <netinet/sctputil.h>
  42 #include <netinet/sctp_output.h>
  43 #include <netinet/sctp_input.h>
  44 #include <netinet/sctp_indata.h>
  45 #include <netinet/sctp_uio.h>
  46 #include <netinet/sctp_timer.h>
  47
  48
  49 /*
  50  * NOTES: On the outbound side of things I need to check the sack timer to
  51  * see if I should generate a sack into the chunk queue (if I have data to
  52  * send that is and will be sending it .. for bundling.
  53  *
  54  * The callback in sctp_usrreq.c will get called when the socket is read from.
  55  * This will cause sctp_service_queues() to get called on the top entry in
  56  * the list.
  57  */
  58
  59 void
  60 sctp_set_rwnd(struct sctp_tcb *stcb, struct sctp_association *asoc)
  61 {
  62         uint32_t calc, calc_w_oh;
  63
  64         /*
  65          * This is really set wrong with respect to a 1-2-m socket. Since
  66          * the sb_cc is the count that everyone as put up. When we re-write
  67          * sctp_soreceive then we will fix this so that ONLY this
  68          * associations data is taken into account.
  69          */
  70         if (stcb->sctp_socket == NULL)
  71                 return;
  72
  73         if (stcb->asoc.sb_cc == 0 &&
  74             asoc->size_on_reasm_queue == 0 &&
  75             asoc->size_on_all_streams == 0) {
  76                 /* Full rwnd granted */
  77                 asoc->my_rwnd = max(SCTP_SB_LIMIT_RCV(stcb->sctp_socket),
  78                     SCTP_MINIMAL_RWND);
  79                 return;
  80         }
  81         /* get actual space */
  82         calc = (uint32_t) sctp_sbspace(&stcb->asoc, &stcb->sctp_socket->so_rcv);
  83
  84         /*
  85          * take out what has NOT been put on socket queue and we yet hold
  86          * for putting up.
  87          */
  88         calc = sctp_sbspace_sub(calc, (uint32_t) asoc->size_on_reasm_queue);
  89         calc = sctp_sbspace_sub(calc, (uint32_t) asoc->size_on_all_streams);
  90
  91         if (calc == 0) {
  92                 /* out of space */
  93                 asoc->my_rwnd = 0;
  94                 return;
  95         }
  96         /* what is the overhead of all these rwnd's */
  97         calc_w_oh = sctp_sbspace_sub(calc, stcb->asoc.my_rwnd_control_len);
  98         asoc->my_rwnd = calc;
  99         if (calc_w_oh == 0) {
 100                 /*
 101                  * If our overhead is greater than the advertised rwnd, we
 102                  * clamp the rwnd to 1. This lets us still accept inbound
 103                  * segments, but hopefully will shut the sender down when he
 104                  * finally gets the message.
 105                  */
 106                 asoc->my_rwnd = 1;
 107         } else {
 108                 /* SWS threshold */
 109                 if (asoc->my_rwnd &&
 110                     (asoc->my_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_receiver)) {
 111                         /* SWS engaged, tell peer none left */
 112                         asoc->my_rwnd = 1;
 113                 }
 114         }
 115 }
 116
 117 /* Calculate what the rwnd would be */
 118
 119 uint32_t
 120 sctp_calc_rwnd(struct sctp_tcb *stcb, struct sctp_association *asoc)
 121 {
 122         uint32_t calc = 0, calc_w_oh;
 123
 124         /*
 125          * This is really set wrong with respect to a 1-2-m socket. Since
 126          * the sb_cc is the count that everyone as put up. When we re-write
 127          * sctp_soreceive then we will fix this so that ONLY this
 128          * associations data is taken into account.
 129          */
 130         if (stcb->sctp_socket == NULL)
 131                 return (calc);
 132
 133         if (stcb->asoc.sb_cc == 0 &&
 134             asoc->size_on_reasm_queue == 0 &&
 135             asoc->size_on_all_streams == 0) {
 136                 /* Full rwnd granted */
 137                 calc = max(SCTP_SB_LIMIT_RCV(stcb->sctp_socket),
 138                     SCTP_MINIMAL_RWND);
 139                 return (calc);
 140         }
 141         /* get actual space */
 142         calc = (uint32_t) sctp_sbspace(&stcb->asoc, &stcb->sctp_socket->so_rcv);
 143
 144         /*
 145          * take out what has NOT been put on socket queue and we yet hold
 146          * for putting up.
 147          */
 148         calc = sctp_sbspace_sub(calc, (uint32_t) asoc->size_on_reasm_queue);
 149         calc = sctp_sbspace_sub(calc, (uint32_t) asoc->size_on_all_streams);
 150
 151         if (calc == 0) {
 152                 /* out of space */
 153                 return (calc);
 154         }
 155         /* what is the overhead of all these rwnd's */
 156         calc_w_oh = sctp_sbspace_sub(calc, stcb->asoc.my_rwnd_control_len);
 157         if (calc_w_oh == 0) {
 158                 /*
 159                  * If our overhead is greater than the advertised rwnd, we
 160                  * clamp the rwnd to 1. This lets us still accept inbound
 161                  * segments, but hopefully will shut the sender down when he
 162                  * finally gets the message.
 163                  */
 164                 calc = 1;
 165         } else {
 166                 /* SWS threshold */
 167                 if (calc &&
 168                     (calc < stcb->sctp_ep->sctp_ep.sctp_sws_receiver)) {
 169                         /* SWS engaged, tell peer none left */
 170                         calc = 1;
 171                 }
 172         }
 173         return (calc);
 174 }
 175
 176
 177
 178 /*
 179  * Build out our readq entry based on the incoming packet.
 180  */
 181 struct sctp_queued_to_read *
 182 sctp_build_readq_entry(struct sctp_tcb *stcb,
 183     struct sctp_nets *net,
 184     uint32_t tsn, uint32_t ppid,
 185     uint32_t context, uint16_t stream_no,
 186     uint16_t stream_seq, uint8_t flags,
 187     struct mbuf *dm)
 188 {
 189         struct sctp_queued_to_read *read_queue_e = NULL;
 190
 191         sctp_alloc_a_readq(stcb, read_queue_e);
 192         if (read_queue_e == NULL) {
 193                 goto failed_build;
 194         }
 195         read_queue_e->sinfo_stream = stream_no;
 196         read_queue_e->sinfo_ssn = stream_seq;
 197         read_queue_e->sinfo_flags = (flags << 8);
 198         read_queue_e->sinfo_ppid = ppid;
 199         read_queue_e->sinfo_context = stcb->asoc.context;
 200         read_queue_e->sinfo_timetolive = 0;
 201         read_queue_e->sinfo_tsn = tsn;
 202         read_queue_e->sinfo_cumtsn = tsn;
 203         read_queue_e->sinfo_assoc_id = sctp_get_associd(stcb);
 204         read_queue_e->whoFrom = net;
 205         read_queue_e->length = 0;
 206         atomic_add_int(&net->ref_count, 1);
 207         read_queue_e->data = dm;
 208         read_queue_e->spec_flags = 0;
 209         read_queue_e->tail_mbuf = NULL;
 210         read_queue_e->aux_data = NULL;
 211         read_queue_e->stcb = stcb;
 212         read_queue_e->port_from = stcb->rport;
 213         read_queue_e->do_not_ref_stcb = 0;
 214         read_queue_e->end_added = 0;
 215         read_queue_e->some_taken = 0;
 216         read_queue_e->pdapi_aborted = 0;
 217 failed_build:
 218         return (read_queue_e);
 219 }
 220
 221
 222 /*
 223  * Build out our readq entry based on the incoming packet.
 224  */
 225 static struct sctp_queued_to_read *
 226 sctp_build_readq_entry_chk(struct sctp_tcb *stcb,
 227     struct sctp_tmit_chunk *chk)
 228 {
 229         struct sctp_queued_to_read *read_queue_e = NULL;
 230
 231         sctp_alloc_a_readq(stcb, read_queue_e);
 232         if (read_queue_e == NULL) {
 233                 goto failed_build;
 234         }
 235         read_queue_e->sinfo_stream = chk->rec.data.stream_number;
 236         read_queue_e->sinfo_ssn = chk->rec.data.stream_seq;
 237         read_queue_e->sinfo_flags = (chk->rec.data.rcv_flags << 8);
 238         read_queue_e->sinfo_ppid = chk->rec.data.payloadtype;
 239         read_queue_e->sinfo_context = stcb->asoc.context;
 240         read_queue_e->sinfo_timetolive = 0;
 241         read_queue_e->sinfo_tsn = chk->rec.data.TSN_seq;
 242         read_queue_e->sinfo_cumtsn = chk->rec.data.TSN_seq;
 243         read_queue_e->sinfo_assoc_id = sctp_get_associd(stcb);
 244         read_queue_e->whoFrom = chk->whoTo;
 245         read_queue_e->aux_data = NULL;
 246         read_queue_e->length = 0;
 247         atomic_add_int(&chk->whoTo->ref_count, 1);
 248         read_queue_e->data = chk->data;
 249         read_queue_e->tail_mbuf = NULL;
 250         read_queue_e->stcb = stcb;
 251         read_queue_e->port_from = stcb->rport;
 252         read_queue_e->spec_flags = 0;
 253         read_queue_e->do_not_ref_stcb = 0;
 254         read_queue_e->end_added = 0;
 255         read_queue_e->some_taken = 0;
 256         read_queue_e->pdapi_aborted = 0;
 257 failed_build:
 258         return (read_queue_e);
 259 }
 260
 261
 262 struct mbuf *
 263 sctp_build_ctl_nchunk(struct sctp_inpcb *inp,
 264     struct sctp_sndrcvinfo *sinfo)
 265 {
 266         struct sctp_sndrcvinfo *outinfo;
 267         struct cmsghdr *cmh;
 268         struct mbuf *ret;
 269         int len;
 270         int use_extended = 0;
 271
 272         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_RECVDATAIOEVNT)) {
 273                 /* user does not want the sndrcv ctl */
 274                 return (NULL);
 275         }
 276         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXT_RCVINFO)) {
 277                 use_extended = 1;
 278                 len = CMSG_LEN(sizeof(struct sctp_extrcvinfo));
 279         } else {
 280                 len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo));
 281         }
 282
 283
 284         ret = sctp_get_mbuf_for_msg(len,
 285             0, M_DONTWAIT, 1, MT_DATA);
 286
 287         if (ret == NULL) {
 288                 /* No space */
 289                 return (ret);
 290         }
 291         /* We need a CMSG header followed by the struct  */
 292         cmh = mtod(ret, struct cmsghdr *);
 293         outinfo = (struct sctp_sndrcvinfo *)CMSG_DATA(cmh);
 294         cmh->cmsg_level = IPPROTO_SCTP;
 295         if (use_extended) {
 296                 cmh->cmsg_type = SCTP_EXTRCV;
 297                 cmh->cmsg_len = len;
 298                 memcpy(outinfo, sinfo, len);
 299         } else {
 300                 cmh->cmsg_type = SCTP_SNDRCV;
 301                 cmh->cmsg_len = len;
 302                 *outinfo = *sinfo;
 303         }
 304         SCTP_BUF_LEN(ret) = cmh->cmsg_len;
 305         return (ret);
 306 }
 307
 308
 309 char *
 310 sctp_build_ctl_cchunk(struct sctp_inpcb *inp,
 311     int *control_len,
 312     struct sctp_sndrcvinfo *sinfo)
 313 {
 314         struct sctp_sndrcvinfo *outinfo;
 315         struct cmsghdr *cmh;
 316         char *buf;
 317         int len;
 318         int use_extended = 0;
 319
 320         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_RECVDATAIOEVNT)) {
 321                 /* user does not want the sndrcv ctl */
 322                 return (NULL);
 323         }
 324         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXT_RCVINFO)) {
 325                 use_extended = 1;
 326                 len = CMSG_LEN(sizeof(struct sctp_extrcvinfo));
 327         } else {
 328                 len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo));
 329         }
 330         SCTP_MALLOC(buf, char *, len, SCTP_M_CMSG);
 331         if (buf == NULL) {
 332                 /* No space */
 333                 return (buf);
 334         }
 335         /* We need a CMSG header followed by the struct  */
 336         cmh = (struct cmsghdr *)buf;
 337         outinfo = (struct sctp_sndrcvinfo *)CMSG_DATA(cmh);
 338         cmh->cmsg_level = IPPROTO_SCTP;
 339         if (use_extended) {
 340                 cmh->cmsg_type = SCTP_EXTRCV;
 341                 cmh->cmsg_len = len;
 342                 memcpy(outinfo, sinfo, len);
 343         } else {
 344                 cmh->cmsg_type = SCTP_SNDRCV;
 345                 cmh->cmsg_len = len;
 346                 *outinfo = *sinfo;
 347         }
 348         *control_len = len;
 349         return (buf);
 350 }
 351
 352
 353 /*
 354  * We are delivering currently from the reassembly queue. We must continue to
 355  * deliver until we either: 1) run out of space. 2) run out of sequential
 356  * TSN's 3) hit the SCTP_DATA_LAST_FRAG flag.
 357  */
 358 static void
 359 sctp_service_reassembly(struct sctp_tcb *stcb, struct sctp_association *asoc)
 360 {
 361         struct sctp_tmit_chunk *chk;
 362         uint16_t nxt_todel;
 363         uint16_t stream_no;
 364         int end = 0;
 365         int cntDel;
 366         struct sctp_queued_to_read *control, *ctl, *ctlat;
 367
 368         if (stcb == NULL)
 369                 return;
 370
 371         cntDel = stream_no = 0;
 372         if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
 373             (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET)) {
 374                 /* socket above is long gone */
 375                 asoc->fragmented_delivery_inprogress = 0;
 376                 chk = TAILQ_FIRST(&asoc->reasmqueue);
 377                 while (chk) {
 378                         TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next);
 379                         asoc->size_on_reasm_queue -= chk->send_size;
 380                         sctp_ucount_decr(asoc->cnt_on_reasm_queue);
 381                         /*
 382                          * Lose the data pointer, since its in the socket
 383                          * buffer
 384                          */
 385                         if (chk->data) {
 386                                 sctp_m_freem(chk->data);
 387                                 chk->data = NULL;
 388                         }
 389                         /* Now free the address and data */
 390                         sctp_free_a_chunk(stcb, chk);
 391                         /* sa_ignore FREED_MEMORY */
 392                         chk = TAILQ_FIRST(&asoc->reasmqueue);
 393                 }
 394                 return;
 395         }
 396         SCTP_TCB_LOCK_ASSERT(stcb);
 397         do {
 398                 chk = TAILQ_FIRST(&asoc->reasmqueue);
 399                 if (chk == NULL) {
 400                         return;
 401                 }
 402                 if (chk->rec.data.TSN_seq != (asoc->tsn_last_delivered + 1)) {
 403                         /* Can't deliver more :< */
 404                         return;
 405                 }
 406                 stream_no = chk->rec.data.stream_number;
 407                 nxt_todel = asoc->strmin[stream_no].last_sequence_delivered + 1;
 408                 if (nxt_todel != chk->rec.data.stream_seq &&
 409                     (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
 410                         /*
 411                          * Not the next sequence to deliver in its stream OR
 412                          * unordered
 413                          */
 414                         return;
 415                 }
 416                 if (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) {
 417
 418                         control = sctp_build_readq_entry_chk(stcb, chk);
 419                         if (control == NULL) {
 420                                 /* out of memory? */
 421                                 return;
 422                         }
 423                         /* save it off for our future deliveries */
 424                         stcb->asoc.control_pdapi = control;
 425                         if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG)
 426                                 end = 1;
 427                         else
 428                                 end = 0;
 429                         sctp_add_to_readq(stcb->sctp_ep,
 430                             stcb, control, &stcb->sctp_socket->so_rcv, end);
 431                         cntDel++;
 432                 } else {
 433                         if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG)
 434                                 end = 1;
 435                         else
 436                                 end = 0;
 437                         if (sctp_append_to_readq(stcb->sctp_ep, stcb,
 438                             stcb->asoc.control_pdapi,
 439                             chk->data, end, chk->rec.data.TSN_seq,
 440                             &stcb->sctp_socket->so_rcv)) {
 441                                 /*
 442                                  * something is very wrong, either
 443                                  * control_pdapi is NULL, or the tail_mbuf
 444                                  * is corrupt, or there is a EOM already on
 445                                  * the mbuf chain.
 446                                  */
 447                                 if ((stcb->asoc.control_pdapi == NULL) || (stcb->asoc.control_pdapi->tail_mbuf == NULL)) {
 448                                         panic("This should not happen control_pdapi NULL?");
 449                                 }
 450                                 /* if we did not panic, it was a EOM */
 451                                 panic("Bad chunking ??");
 452                                 return;
 453                         }
 454                         cntDel++;
 455                 }
 456                 /* pull it we did it */
 457                 TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next);
 458                 if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) {
 459                         asoc->fragmented_delivery_inprogress = 0;
 460                         if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
 461                                 asoc->strmin[stream_no].last_sequence_delivered++;
 462                         }
 463                         if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0) {
 464                                 SCTP_STAT_INCR_COUNTER64(sctps_reasmusrmsgs);
 465                         }
 466                 } else if (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) {
 467                         /*
 468                          * turn the flag back on since we just  delivered
 469                          * yet another one.
 470                          */
 471                         asoc->fragmented_delivery_inprogress = 1;
 472                 }
 473                 asoc->tsn_of_pdapi_last_delivered = chk->rec.data.TSN_seq;
 474                 asoc->last_flags_delivered = chk->rec.data.rcv_flags;
 475                 asoc->last_strm_seq_delivered = chk->rec.data.stream_seq;
 476                 asoc->last_strm_no_delivered = chk->rec.data.stream_number;
 477
 478                 asoc->tsn_last_delivered = chk->rec.data.TSN_seq;
 479                 asoc->size_on_reasm_queue -= chk->send_size;
 480                 sctp_ucount_decr(asoc->cnt_on_reasm_queue);
 481                 /* free up the chk */
 482                 chk->data = NULL;
 483                 sctp_free_a_chunk(stcb, chk);
 484
 485                 if (asoc->fragmented_delivery_inprogress == 0) {
 486                         /*
 487                          * Now lets see if we can deliver the next one on
 488                          * the stream
 489                          */
 490                         struct sctp_stream_in *strm;
 491
 492                         strm = &asoc->strmin[stream_no];
 493                         nxt_todel = strm->last_sequence_delivered + 1;
 494                         ctl = TAILQ_FIRST(&strm->inqueue);
 495                         if (ctl && (nxt_todel == ctl->sinfo_ssn)) {
 496                                 while (ctl != NULL) {
 497                                         /* Deliver more if we can. */
 498                                         if (nxt_todel == ctl->sinfo_ssn) {
 499                                                 ctlat = TAILQ_NEXT(ctl, next);
 500                                                 TAILQ_REMOVE(&strm->inqueue, ctl, next);
 501                                                 asoc->size_on_all_streams -= ctl->length;
 502                                                 sctp_ucount_decr(asoc->cnt_on_all_streams);
 503                                                 strm->last_sequence_delivered++;
 504                                                 sctp_add_to_readq(stcb->sctp_ep, stcb,
 505                                                     ctl,
 506                                                     &stcb->sctp_socket->so_rcv, 1);
 507                                                 ctl = ctlat;
 508                                         } else {
 509                                                 break;
 510                                         }
 511                                         nxt_todel = strm->last_sequence_delivered + 1;
 512                                 }
 513                         }
 514                         break;
 515                 }
 516                 /* sa_ignore FREED_MEMORY */
 517                 chk = TAILQ_FIRST(&asoc->reasmqueue);
 518         } while (chk);
 519 }
 520
 521 /*
 522  * Queue the chunk either right into the socket buffer if it is the next one
 523  * to go OR put it in the correct place in the delivery queue.  If we do
 524  * append to the so_buf, keep doing so until we are out of order. One big
 525  * question still remains, what to do when the socket buffer is FULL??
 526  */
 527 static void
 528 sctp_queue_data_to_stream(struct sctp_tcb *stcb, struct sctp_association *asoc,
 529     struct sctp_queued_to_read *control, int *abort_flag)
 530 {
 531         /*
 532          * FIX-ME maybe? What happens when the ssn wraps? If we are getting
 533          * all the data in one stream this could happen quite rapidly. One
 534          * could use the TSN to keep track of things, but this scheme breaks
 535          * down in the other type of stream useage that could occur. Send a
 536          * single msg to stream 0, send 4Billion messages to stream 1, now
 537          * send a message to stream 0. You have a situation where the TSN
 538          * has wrapped but not in the stream. Is this worth worrying about
 539          * or should we just change our queue sort at the bottom to be by
 540          * TSN.
 541          *
 542          * Could it also be legal for a peer to send ssn 1 with TSN 2 and ssn 2
 543          * with TSN 1? If the peer is doing some sort of funky TSN/SSN
 544          * assignment this could happen... and I don't see how this would be
 545          * a violation. So for now I am undecided an will leave the sort by
 546          * SSN alone. Maybe a hybred approach is the answer
 547          *
 548          */
 549         struct sctp_stream_in *strm;
 550         struct sctp_queued_to_read *at;
 551         int queue_needed;
 552         uint16_t nxt_todel;
 553         struct mbuf *oper;
 554
 555         queue_needed = 1;
 556         asoc->size_on_all_streams += control->length;
 557         sctp_ucount_incr(asoc->cnt_on_all_streams);
 558         strm = &asoc->strmin[control->sinfo_stream];
 559         nxt_todel = strm->last_sequence_delivered + 1;
 560         if (sctp_logging_level & SCTP_STR_LOGGING_ENABLE) {
 561                 sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_INTO_STRD);
 562         }
 563         SCTPDBG(SCTP_DEBUG_INDATA1,
 564             "queue to stream called for ssn:%u lastdel:%u nxt:%u\n",
 565             (uint32_t) control->sinfo_stream,
 566             (uint32_t) strm->last_sequence_delivered,
 567             (uint32_t) nxt_todel);
 568         if (compare_with_wrap(strm->last_sequence_delivered,
 569             control->sinfo_ssn, MAX_SEQ) ||
 570             (strm->last_sequence_delivered == control->sinfo_ssn)) {
 571                 /* The incoming sseq is behind where we last delivered? */
 572                 SCTPDBG(SCTP_DEBUG_INDATA1, "Duplicate S-SEQ:%d delivered:%d from peer, Abort  association\n",
 573                     control->sinfo_ssn, strm->last_sequence_delivered);
 574                 /*
 575                  * throw it in the stream so it gets cleaned up in
 576                  * association destruction
 577                  */
 578                 TAILQ_INSERT_HEAD(&strm->inqueue, control, next);
 579                 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
 580                     0, M_DONTWAIT, 1, MT_DATA);
 581                 if (oper) {
 582                         struct sctp_paramhdr *ph;
 583                         uint32_t *ippp;
 584
 585                         SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
 586                             (sizeof(uint32_t) * 3);
 587                         ph = mtod(oper, struct sctp_paramhdr *);
 588                         ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
 589                         ph->param_length = htons(SCTP_BUF_LEN(oper));
 590                         ippp = (uint32_t *) (ph + 1);
 591                         *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_1);
 592                         ippp++;
 593                         *ippp = control->sinfo_tsn;
 594                         ippp++;
 595                         *ippp = ((control->sinfo_stream << 16) | control->sinfo_ssn);
 596                 }
 597                 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_1;
 598                 sctp_abort_an_association(stcb->sctp_ep, stcb,
 599                     SCTP_PEER_FAULTY, oper);
 600
 601                 *abort_flag = 1;
 602                 return;
 603
 604         }
 605         if (nxt_todel == control->sinfo_ssn) {
 606                 /* can be delivered right away? */
 607                 if (sctp_logging_level & SCTP_STR_LOGGING_ENABLE) {
 608                         sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_IMMED_DEL);
 609                 }
 610                 queue_needed = 0;
 611                 asoc->size_on_all_streams -= control->length;
 612                 sctp_ucount_decr(asoc->cnt_on_all_streams);
 613                 strm->last_sequence_delivered++;
 614                 sctp_add_to_readq(stcb->sctp_ep, stcb,
 615                     control,
 616                     &stcb->sctp_socket->so_rcv, 1);
 617                 control = TAILQ_FIRST(&strm->inqueue);
 618                 while (control != NULL) {
 619                         /* all delivered */
 620                         nxt_todel = strm->last_sequence_delivered + 1;
 621                         if (nxt_todel == control->sinfo_ssn) {
 622                                 at = TAILQ_NEXT(control, next);
 623                                 TAILQ_REMOVE(&strm->inqueue, control, next);
 624                                 asoc->size_on_all_streams -= control->length;
 625                                 sctp_ucount_decr(asoc->cnt_on_all_streams);
 626                                 strm->last_sequence_delivered++;
 627                                 /*
 628                                  * We ignore the return of deliver_data here
 629                                  * since we always can hold the chunk on the
 630                                  * d-queue. And we have a finite number that
 631                                  * can be delivered from the strq.
 632                                  */
 633                                 if (sctp_logging_level & SCTP_STR_LOGGING_ENABLE) {
 634                                         sctp_log_strm_del(control, NULL,
 635                                             SCTP_STR_LOG_FROM_IMMED_DEL);
 636                                 }
 637                                 sctp_add_to_readq(stcb->sctp_ep, stcb,
 638                                     control,
 639                                     &stcb->sctp_socket->so_rcv, 1);
 640                                 control = at;
 641                                 continue;
 642                         }
 643                         break;
 644                 }
 645         }
 646         if (queue_needed) {
 647                 /*
 648                  * Ok, we did not deliver this guy, find the correct place
 649                  * to put it on the queue.
 650                  */
 651                 if (TAILQ_EMPTY(&strm->inqueue)) {
 652                         /* Empty queue */
 653                         if (sctp_logging_level & SCTP_STR_LOGGING_ENABLE) {
 654                                 sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_INSERT_HD);
 655                         }
 656                         TAILQ_INSERT_HEAD(&strm->inqueue, control, next);
 657                 } else {
 658                         TAILQ_FOREACH(at, &strm->inqueue, next) {
 659                                 if (compare_with_wrap(at->sinfo_ssn,
 660                                     control->sinfo_ssn, MAX_SEQ)) {
 661                                         /*
 662                                          * one in queue is bigger than the
 663                                          * new one, insert before this one
 664                                          */
 665                                         if (sctp_logging_level & SCTP_STR_LOGGING_ENABLE) {
 666                                                 sctp_log_strm_del(control, at,
 667                                                     SCTP_STR_LOG_FROM_INSERT_MD);
 668                                         }
 669                                         TAILQ_INSERT_BEFORE(at, control, next);
 670                                         break;
 671                                 } else if (at->sinfo_ssn == control->sinfo_ssn) {
 672                                         /*
 673                                          * Gak, He sent me a duplicate str
 674                                          * seq number
 675                                          */
 676                                         /*
 677                                          * foo bar, I guess I will just free
 678                                          * this new guy, should we abort
 679                                          * too? FIX ME MAYBE? Or it COULD be
 680                                          * that the SSN's have wrapped.
 681                                          * Maybe I should compare to TSN
 682                                          * somehow... sigh for now just blow
 683                                          * away the chunk!
 684                                          */
 685
 686                                         if (control->data)
 687                                                 sctp_m_freem(control->data);
 688                                         control->data = NULL;
 689                                         asoc->size_on_all_streams -= control->length;
 690                                         sctp_ucount_decr(asoc->cnt_on_all_streams);
 691                                         if (control->whoFrom)
 692                                                 sctp_free_remote_addr(control->whoFrom);
 693                                         control->whoFrom = NULL;
 694                                         sctp_free_a_readq(stcb, control);
 695                                         return;
 696                                 } else {
 697                                         if (TAILQ_NEXT(at, next) == NULL) {
 698                                                 /*
 699                                                  * We are at the end, insert
 700                                                  * it after this one
 701                                                  */
 702                                                 if (sctp_logging_level & SCTP_STR_LOGGING_ENABLE) {
 703                                                         sctp_log_strm_del(control, at,
 704                                                             SCTP_STR_LOG_FROM_INSERT_TL);
 705                                                 }
 706                                                 TAILQ_INSERT_AFTER(&strm->inqueue,
 707                                                     at, control, next);
 708                                                 break;
 709                                         }
 710                                 }
 711                         }
 712                 }
 713         }
 714 }
 715
 716 /*
 717  * Returns two things: You get the total size of the deliverable parts of the
 718  * first fragmented message on the reassembly queue. And you get a 1 back if
 719  * all of the message is ready or a 0 back if the message is still incomplete
 720  */
 721 static int
 722 sctp_is_all_msg_on_reasm(struct sctp_association *asoc, uint32_t * t_size)
 723 {
 724         struct sctp_tmit_chunk *chk;
 725         uint32_t tsn;
 726
 727         *t_size = 0;
 728         chk = TAILQ_FIRST(&asoc->reasmqueue);
 729         if (chk == NULL) {
 730                 /* nothing on the queue */
 731                 return (0);
 732         }
 733         if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0) {
 734                 /* Not a first on the queue */
 735                 return (0);
 736         }
 737         tsn = chk->rec.data.TSN_seq;
 738         while (chk) {
 739                 if (tsn != chk->rec.data.TSN_seq) {
 740                         return (0);
 741                 }
 742                 *t_size += chk->send_size;
 743                 if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) {
 744                         return (1);
 745                 }
 746                 tsn++;
 747                 chk = TAILQ_NEXT(chk, sctp_next);
 748         }
 749         return (0);
 750 }
 751
 752 static void
 753 sctp_deliver_reasm_check(struct sctp_tcb *stcb, struct sctp_association *asoc)
 754 {
 755         struct sctp_tmit_chunk *chk;
 756         uint16_t nxt_todel;
 757         uint32_t tsize;
 758
 759 doit_again:
 760         chk = TAILQ_FIRST(&asoc->reasmqueue);
 761         if (chk == NULL) {
 762                 /* Huh? */
 763                 asoc->size_on_reasm_queue = 0;
 764                 asoc->cnt_on_reasm_queue = 0;
 765                 return;
 766         }
 767         if (asoc->fragmented_delivery_inprogress == 0) {
 768                 nxt_todel =
 769                     asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered + 1;
 770                 if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) &&
 771                     (nxt_todel == chk->rec.data.stream_seq ||
 772                     (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED))) {
 773                         /*
 774                          * Yep the first one is here and its ok to deliver
 775                          * but should we?
 776                          */
 777                         if ((sctp_is_all_msg_on_reasm(asoc, &tsize) ||
 778                             (tsize > stcb->sctp_ep->partial_delivery_point))) {
 779
 780                                 /*
 781                                  * Yes, we setup to start reception, by
 782                                  * backing down the TSN just in case we
 783                                  * can't deliver. If we
 784                                  */
 785                                 asoc->fragmented_delivery_inprogress = 1;
 786                                 asoc->tsn_last_delivered =
 787                                     chk->rec.data.TSN_seq - 1;
 788                                 asoc->str_of_pdapi =
 789                                     chk->rec.data.stream_number;
 790                                 asoc->ssn_of_pdapi = chk->rec.data.stream_seq;
 791                                 asoc->pdapi_ppid = chk->rec.data.payloadtype;
 792                                 asoc->fragment_flags = chk->rec.data.rcv_flags;
 793                                 sctp_service_reassembly(stcb, asoc);
 794                         }
 795                 }
 796         } else {
 797                 /*
 798                  * Service re-assembly will deliver stream data queued at
 799                  * the end of fragmented delivery.. but it wont know to go
 800                  * back and call itself again... we do that here with the
 801                  * got doit_again
 802                  */
 803                 sctp_service_reassembly(stcb, asoc);
 804                 if (asoc->fragmented_delivery_inprogress == 0) {
 805                         /*
 806                          * finished our Fragmented delivery, could be more
 807                          * waiting?
 808                          */
 809                         goto doit_again;
 810                 }
 811         }
 812 }
 813
 814 /*
 815  * Dump onto the re-assembly queue, in its proper place. After dumping on the
 816  * queue, see if anthing can be delivered. If so pull it off (or as much as
 817  * we can. If we run out of space then we must dump what we can and set the
 818  * appropriate flag to say we queued what we could.
 819  */
 820 static void
 821 sctp_queue_data_for_reasm(struct sctp_tcb *stcb, struct sctp_association *asoc,
 822     struct sctp_tmit_chunk *chk, int *abort_flag)
 823 {
 824         struct mbuf *oper;
 825         uint32_t cum_ackp1, last_tsn, prev_tsn, post_tsn;
 826         u_char last_flags;
 827         struct sctp_tmit_chunk *at, *prev, *next;
 828
 829         prev = next = NULL;
 830         cum_ackp1 = asoc->tsn_last_delivered + 1;
 831         if (TAILQ_EMPTY(&asoc->reasmqueue)) {
 832                 /* This is the first one on the queue */
 833                 TAILQ_INSERT_HEAD(&asoc->reasmqueue, chk, sctp_next);
 834                 /*
 835                  * we do not check for delivery of anything when only one
 836                  * fragment is here
 837                  */
 838                 asoc->size_on_reasm_queue = chk->send_size;
 839                 sctp_ucount_incr(asoc->cnt_on_reasm_queue);
 840                 if (chk->rec.data.TSN_seq == cum_ackp1) {
 841                         if (asoc->fragmented_delivery_inprogress == 0 &&
 842                             (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) !=
 843                             SCTP_DATA_FIRST_FRAG) {
 844                                 /*
 845                                  * An empty queue, no delivery inprogress,
 846                                  * we hit the next one and it does NOT have
 847                                  * a FIRST fragment mark.
 848                                  */
 849                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, its not first, no fragmented delivery in progress\n");
 850                                 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
 851                                     0, M_DONTWAIT, 1, MT_DATA);
 852
 853                                 if (oper) {
 854                                         struct sctp_paramhdr *ph;
 855                                         uint32_t *ippp;
 856
 857                                         SCTP_BUF_LEN(oper) =
 858                                             sizeof(struct sctp_paramhdr) +
 859                                             (sizeof(uint32_t) * 3);
 860                                         ph = mtod(oper, struct sctp_paramhdr *);
 861                                         ph->param_type =
 862                                             htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
 863                                         ph->param_length = htons(SCTP_BUF_LEN(oper));
 864                                         ippp = (uint32_t *) (ph + 1);
 865                                         *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_2);
 866                                         ippp++;
 867                                         *ippp = chk->rec.data.TSN_seq;
 868                                         ippp++;
 869                                         *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
 870
 871                                 }
 872                                 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_2;
 873                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
 874                                     SCTP_PEER_FAULTY, oper);
 875                                 *abort_flag = 1;
 876                         } else if (asoc->fragmented_delivery_inprogress &&
 877                             (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == SCTP_DATA_FIRST_FRAG) {
 878                                 /*
 879                                  * We are doing a partial delivery and the
 880                                  * NEXT chunk MUST be either the LAST or
 881                                  * MIDDLE fragment NOT a FIRST
 882                                  */
 883                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it IS a first and fragmented delivery in progress\n");
 884                                 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
 885                                     0, M_DONTWAIT, 1, MT_DATA);
 886                                 if (oper) {
 887                                         struct sctp_paramhdr *ph;
 888                                         uint32_t *ippp;
 889
 890                                         SCTP_BUF_LEN(oper) =
 891                                             sizeof(struct sctp_paramhdr) +
 892                                             (3 * sizeof(uint32_t));
 893                                         ph = mtod(oper, struct sctp_paramhdr *);
 894                                         ph->param_type =
 895                                             htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
 896                                         ph->param_length = htons(SCTP_BUF_LEN(oper));
 897                                         ippp = (uint32_t *) (ph + 1);
 898                                         *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_3);
 899                                         ippp++;
 900                                         *ippp = chk->rec.data.TSN_seq;
 901                                         ippp++;
 902                                         *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
 903                                 }
 904                                 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_3;
 905                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
 906                                     SCTP_PEER_FAULTY, oper);
 907                                 *abort_flag = 1;
 908                         } else if (asoc->fragmented_delivery_inprogress) {
 909                                 /*
 910                                  * Here we are ok with a MIDDLE or LAST
 911                                  * piece
 912                                  */
 913                                 if (chk->rec.data.stream_number !=
 914                                     asoc->str_of_pdapi) {
 915                                         /* Got to be the right STR No */
 916                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it IS not same stream number %d vs %d\n",
 917                                             chk->rec.data.stream_number,
 918                                             asoc->str_of_pdapi);
 919                                         oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
 920                                             0, M_DONTWAIT, 1, MT_DATA);
 921                                         if (oper) {
 922                                                 struct sctp_paramhdr *ph;
 923                                                 uint32_t *ippp;
 924
 925                                                 SCTP_BUF_LEN(oper) =
 926                                                     sizeof(struct sctp_paramhdr) +
 927                                                     (sizeof(uint32_t) * 3);
 928                                                 ph = mtod(oper,
 929                                                     struct sctp_paramhdr *);
 930                                                 ph->param_type =
 931                                                     htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
 932                                                 ph->param_length =
 933                                                     htons(SCTP_BUF_LEN(oper));
 934                                                 ippp = (uint32_t *) (ph + 1);
 935                                                 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_4);
 936                                                 ippp++;
 937                                                 *ippp = chk->rec.data.TSN_seq;
 938                                                 ippp++;
 939                                                 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
 940                                         }
 941                                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_4;
 942                                         sctp_abort_an_association(stcb->sctp_ep,
 943                                             stcb, SCTP_PEER_FAULTY, oper);
 944                                         *abort_flag = 1;
 945                                 } else if ((asoc->fragment_flags & SCTP_DATA_UNORDERED) !=
 946                                             SCTP_DATA_UNORDERED &&
 947                                             chk->rec.data.stream_seq !=
 948                                     asoc->ssn_of_pdapi) {
 949                                         /* Got to be the right STR Seq */
 950                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it IS not same stream seq %d vs %d\n",
 951                                             chk->rec.data.stream_seq,
 952                                             asoc->ssn_of_pdapi);
 953                                         oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
 954                                             0, M_DONTWAIT, 1, MT_DATA);
 955                                         if (oper) {
 956                                                 struct sctp_paramhdr *ph;
 957                                                 uint32_t *ippp;
 958
 959                                                 SCTP_BUF_LEN(oper) =
 960                                                     sizeof(struct sctp_paramhdr) +
 961                                                     (3 * sizeof(uint32_t));
 962                                                 ph = mtod(oper,
 963                                                     struct sctp_paramhdr *);
 964                                                 ph->param_type =
 965                                                     htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
 966                                                 ph->param_length =
 967                                                     htons(SCTP_BUF_LEN(oper));
 968                                                 ippp = (uint32_t *) (ph + 1);
 969                                                 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_5);
 970                                                 ippp++;
 971                                                 *ippp = chk->rec.data.TSN_seq;
 972                                                 ippp++;
 973                                                 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
 974
 975                                         }
 976                                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_5;
 977                                         sctp_abort_an_association(stcb->sctp_ep,
 978                                             stcb, SCTP_PEER_FAULTY, oper);
 979                                         *abort_flag = 1;
 980                                 }
 981                         }
 982                 }
 983                 return;
 984         }
 985         /* Find its place */
 986         TAILQ_FOREACH(at, &asoc->reasmqueue, sctp_next) {
 987                 if (compare_with_wrap(at->rec.data.TSN_seq,
 988                     chk->rec.data.TSN_seq, MAX_TSN)) {
 989                         /*
 990                          * one in queue is bigger than the new one, insert
 991                          * before this one
 992                          */
 993                         /* A check */
 994                         asoc->size_on_reasm_queue += chk->send_size;
 995                         sctp_ucount_incr(asoc->cnt_on_reasm_queue);
 996                         next = at;
 997                         TAILQ_INSERT_BEFORE(at, chk, sctp_next);
 998                         break;
 999                 } else if (at->rec.data.TSN_seq == chk->rec.data.TSN_seq) {
1000                         /* Gak, He sent me a duplicate str seq number */
1001                         /*
1002                          * foo bar, I guess I will just free this new guy,
1003                          * should we abort too? FIX ME MAYBE? Or it COULD be
1004                          * that the SSN's have wrapped. Maybe I should
1005                          * compare to TSN somehow... sigh for now just blow
1006                          * away the chunk!
1007                          */
1008                         if (chk->data) {
1009                                 sctp_m_freem(chk->data);
1010                                 chk->data = NULL;
1011                         }
1012                         sctp_free_a_chunk(stcb, chk);
1013                         return;
1014                 } else {
1015                         last_flags = at->rec.data.rcv_flags;
1016                         last_tsn = at->rec.data.TSN_seq;
1017                         prev = at;
1018                         if (TAILQ_NEXT(at, sctp_next) == NULL) {
1019                                 /*
1020                                  * We are at the end, insert it after this
1021                                  * one
1022                                  */
1023                                 /* check it first */
1024                                 asoc->size_on_reasm_queue += chk->send_size;
1025                                 sctp_ucount_incr(asoc->cnt_on_reasm_queue);
1026                                 TAILQ_INSERT_AFTER(&asoc->reasmqueue, at, chk, sctp_next);
1027                                 break;
1028                         }
1029                 }
1030         }
1031         /* Now the audits */
1032         if (prev) {
1033                 prev_tsn = chk->rec.data.TSN_seq - 1;
1034                 if (prev_tsn == prev->rec.data.TSN_seq) {
1035                         /*
1036                          * Ok the one I am dropping onto the end is the
1037                          * NEXT. A bit of valdiation here.
1038                          */
1039                         if ((prev->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
1040                             SCTP_DATA_FIRST_FRAG ||
1041                             (prev->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
1042                             SCTP_DATA_MIDDLE_FRAG) {
1043                                 /*
1044                                  * Insert chk MUST be a MIDDLE or LAST
1045                                  * fragment
1046                                  */
1047                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
1048                                     SCTP_DATA_FIRST_FRAG) {
1049                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - It can be a midlle or last but not a first\n");
1050                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it's a FIRST!\n");
1051                                         oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
1052                                             0, M_DONTWAIT, 1, MT_DATA);
1053                                         if (oper) {
1054                                                 struct sctp_paramhdr *ph;
1055                                                 uint32_t *ippp;
1056
1057                                                 SCTP_BUF_LEN(oper) =
1058                                                     sizeof(struct sctp_paramhdr) +
1059                                                     (3 * sizeof(uint32_t));
1060                                                 ph = mtod(oper,
1061                                                     struct sctp_paramhdr *);
1062                                                 ph->param_type =
1063                                                     htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
1064                                                 ph->param_length =
1065                                                     htons(SCTP_BUF_LEN(oper));
1066                                                 ippp = (uint32_t *) (ph + 1);
1067                                                 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_6);
1068                                                 ippp++;
1069                                                 *ippp = chk->rec.data.TSN_seq;
1070                                                 ippp++;
1071                                                 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
1072
1073                                         }
1074                                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_6;
1075                                         sctp_abort_an_association(stcb->sctp_ep,
1076                                             stcb, SCTP_PEER_FAULTY, oper);
1077                                         *abort_flag = 1;
1078                                         return;
1079                                 }
1080                                 if (chk->rec.data.stream_number !=
1081                                     prev->rec.data.stream_number) {
1082                                         /*
1083                                          * Huh, need the correct STR here,
1084                                          * they must be the same.
1085                                          */
1086                                         SCTP_PRINTF("Prev check - Gak, Evil plot, ssn:%d not the same as at:%d\n",
1087                                             chk->rec.data.stream_number,
1088                                             prev->rec.data.stream_number);
1089                                         oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
1090                                             0, M_DONTWAIT, 1, MT_DATA);
1091                                         if (oper) {
1092                                                 struct sctp_paramhdr *ph;
1093                                                 uint32_t *ippp;
1094
1095                                                 SCTP_BUF_LEN(oper) =
1096                                                     sizeof(struct sctp_paramhdr) +
1097                                                     (3 * sizeof(uint32_t));
1098                                                 ph = mtod(oper,
1099                                                     struct sctp_paramhdr *);
1100                                                 ph->param_type =
1101                                                     htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
1102                                                 ph->param_length =
1103                                                     htons(SCTP_BUF_LEN(oper));
1104                                                 ippp = (uint32_t *) (ph + 1);
1105                                                 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_7);
1106                                                 ippp++;
1107                                                 *ippp = chk->rec.data.TSN_seq;
1108                                                 ippp++;
1109                                                 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
1110                                         }
1111                                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_7;
1112                                         sctp_abort_an_association(stcb->sctp_ep,
1113                                             stcb, SCTP_PEER_FAULTY, oper);
1114
1115                                         *abort_flag = 1;
1116                                         return;
1117                                 }
1118                                 if ((prev->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0 &&
1119                                     chk->rec.data.stream_seq !=
1120                                     prev->rec.data.stream_seq) {
1121                                         /*
1122                                          * Huh, need the correct STR here,
1123                                          * they must be the same.
1124                                          */
1125                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - Gak, Evil plot, sseq:%d not the same as at:%d\n",
1126                                             chk->rec.data.stream_seq,
1127                                             prev->rec.data.stream_seq);
1128                                         oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
1129                                             0, M_DONTWAIT, 1, MT_DATA);
1130                                         if (oper) {
1131                                                 struct sctp_paramhdr *ph;
1132                                                 uint32_t *ippp;
1133
1134                                                 SCTP_BUF_LEN(oper) =
1135                                                     sizeof(struct sctp_paramhdr) +
1136                                                     (3 * sizeof(uint32_t));
1137                                                 ph = mtod(oper,
1138                                                     struct sctp_paramhdr *);
1139                                                 ph->param_type =
1140                                                     htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
1141                                                 ph->param_length =
1142                                                     htons(SCTP_BUF_LEN(oper));
1143                                                 ippp = (uint32_t *) (ph + 1);
1144                                                 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_8);
1145                                                 ippp++;
1146                                                 *ippp = chk->rec.data.TSN_seq;
1147                                                 ippp++;
1148                                                 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
1149                                         }
1150                                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_8;
1151                                         sctp_abort_an_association(stcb->sctp_ep,
1152                                             stcb, SCTP_PEER_FAULTY, oper);
1153
1154                                         *abort_flag = 1;
1155                                         return;
1156                                 }
1157                         } else if ((prev->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
1158                             SCTP_DATA_LAST_FRAG) {
1159                                 /* Insert chk MUST be a FIRST */
1160                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) !=
1161                                     SCTP_DATA_FIRST_FRAG) {
1162                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - Gak, evil plot, its not FIRST and it must be!\n");
1163                                         oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
1164                                             0, M_DONTWAIT, 1, MT_DATA);
1165                                         if (oper) {
1166                                                 struct sctp_paramhdr *ph;
1167                                                 uint32_t *ippp;
1168
1169                                                 SCTP_BUF_LEN(oper) =
1170                                                     sizeof(struct sctp_paramhdr) +
1171                                                     (3 * sizeof(uint32_t));
1172                                                 ph = mtod(oper,
1173                                                     struct sctp_paramhdr *);
1174                                                 ph->param_type =
1175                                                     htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
1176                                                 ph->param_length =
1177                                                     htons(SCTP_BUF_LEN(oper));
1178                                                 ippp = (uint32_t *) (ph + 1);
1179                                                 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_9);
1180                                                 ippp++;
1181                                                 *ippp = chk->rec.data.TSN_seq;
1182                                                 ippp++;
1183                                                 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
1184
1185                                         }
1186                                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_9;
1187                                         sctp_abort_an_association(stcb->sctp_ep,
1188                                             stcb, SCTP_PEER_FAULTY, oper);
1189
1190                                         *abort_flag = 1;
1191                                         return;
1192                                 }
1193                         }
1194                 }
1195         }
1196         if (next) {
1197                 post_tsn = chk->rec.data.TSN_seq + 1;
1198                 if (post_tsn == next->rec.data.TSN_seq) {
1199                         /*
1200                          * Ok the one I am inserting ahead of is my NEXT
1201                          * one. A bit of valdiation here.
1202                          */
1203                         if (next->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) {
1204                                 /* Insert chk MUST be a last fragment */
1205                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK)
1206                                     != SCTP_DATA_LAST_FRAG) {
1207                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Next is FIRST, we must be LAST\n");
1208                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, its not a last!\n");
1209                                         oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
1210                                             0, M_DONTWAIT, 1, MT_DATA);
1211                                         if (oper) {
1212                                                 struct sctp_paramhdr *ph;
1213                                                 uint32_t *ippp;
1214
1215                                                 SCTP_BUF_LEN(oper) =
1216                                                     sizeof(struct sctp_paramhdr) +
1217                                                     (3 * sizeof(uint32_t));
1218                                                 ph = mtod(oper,
1219                                                     struct sctp_paramhdr *);
1220                                                 ph->param_type =
1221                                                     htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
1222                                                 ph->param_length =
1223                                                     htons(SCTP_BUF_LEN(oper));
1224                                                 ippp = (uint32_t *) (ph + 1);
1225                                                 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_10);
1226                                                 ippp++;
1227                                                 *ippp = chk->rec.data.TSN_seq;
1228                                                 ippp++;
1229                                                 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
1230                                         }
1231                                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_10;
1232                                         sctp_abort_an_association(stcb->sctp_ep,
1233                                             stcb, SCTP_PEER_FAULTY, oper);
1234
1235                                         *abort_flag = 1;
1236                                         return;
1237                                 }
1238                         } else if ((next->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
1239                                     SCTP_DATA_MIDDLE_FRAG ||
1240                                     (next->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
1241                             SCTP_DATA_LAST_FRAG) {
1242                                 /*
1243                                  * Insert chk CAN be MIDDLE or FIRST NOT
1244                                  * LAST
1245                                  */
1246                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
1247                                     SCTP_DATA_LAST_FRAG) {
1248                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Next is a MIDDLE/LAST\n");
1249                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, new prev chunk is a LAST\n");
1250                                         oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
1251                                             0, M_DONTWAIT, 1, MT_DATA);
1252                                         if (oper) {
1253                                                 struct sctp_paramhdr *ph;
1254                                                 uint32_t *ippp;
1255
1256                                                 SCTP_BUF_LEN(oper) =
1257                                                     sizeof(struct sctp_paramhdr) +
1258                                                     (3 * sizeof(uint32_t));
1259                                                 ph = mtod(oper,
1260                                                     struct sctp_paramhdr *);
1261                                                 ph->param_type =
1262                                                     htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
1263                                                 ph->param_length =
1264                                                     htons(SCTP_BUF_LEN(oper));
1265                                                 ippp = (uint32_t *) (ph + 1);
1266                                                 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_11);
1267                                                 ippp++;
1268                                                 *ippp = chk->rec.data.TSN_seq;
1269                                                 ippp++;
1270                                                 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
1271
1272                                         }
1273                                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_11;
1274                                         sctp_abort_an_association(stcb->sctp_ep,
1275                                             stcb, SCTP_PEER_FAULTY, oper);
1276
1277                                         *abort_flag = 1;
1278                                         return;
1279                                 }
1280                                 if (chk->rec.data.stream_number !=
1281                                     next->rec.data.stream_number) {
1282                                         /*
1283                                          * Huh, need the correct STR here,
1284                                          * they must be the same.
1285                                          */
1286                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Gak, Evil plot, ssn:%d not the same as at:%d\n",
1287                                             chk->rec.data.stream_number,
1288                                             next->rec.data.stream_number);
1289                                         oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
1290                                             0, M_DONTWAIT, 1, MT_DATA);
1291                                         if (oper) {
1292                                                 struct sctp_paramhdr *ph;
1293                                                 uint32_t *ippp;
1294
1295                                                 SCTP_BUF_LEN(oper) =
1296                                                     sizeof(struct sctp_paramhdr) +
1297                                                     (3 * sizeof(uint32_t));
1298                                                 ph = mtod(oper,
1299                                                     struct sctp_paramhdr *);
1300                                                 ph->param_type =
1301                                                     htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
1302                                                 ph->param_length =
1303                                                     htons(SCTP_BUF_LEN(oper));
1304                                                 ippp = (uint32_t *) (ph + 1);
1305                                                 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_12);
1306                                                 ippp++;
1307                                                 *ippp = chk->rec.data.TSN_seq;
1308                                                 ippp++;
1309                                                 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
1310
1311                                         }
1312                                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_12;
1313                                         sctp_abort_an_association(stcb->sctp_ep,
1314                                             stcb, SCTP_PEER_FAULTY, oper);
1315
1316                                         *abort_flag = 1;
1317                                         return;
1318                                 }
1319                                 if ((next->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0 &&
1320                                     chk->rec.data.stream_seq !=
1321                                     next->rec.data.stream_seq) {
1322                                         /*
1323                                          * Huh, need the correct STR here,
1324                                          * they must be the same.
1325                                          */
1326                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Gak, Evil plot, sseq:%d not the same as at:%d\n",
1327                                             chk->rec.data.stream_seq,
1328                                             next->rec.data.stream_seq);
1329                                         oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
1330                                             0, M_DONTWAIT, 1, MT_DATA);
1331                                         if (oper) {
1332                                                 struct sctp_paramhdr *ph;
1333                                                 uint32_t *ippp;
1334
1335                                                 SCTP_BUF_LEN(oper) =
1336                                                     sizeof(struct sctp_paramhdr) +
1337                                                     (3 * sizeof(uint32_t));
1338                                                 ph = mtod(oper,
1339                                                     struct sctp_paramhdr *);
1340                                                 ph->param_type =
1341                                                     htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
1342                                                 ph->param_length =
1343                                                     htons(SCTP_BUF_LEN(oper));
1344                                                 ippp = (uint32_t *) (ph + 1);
1345                                                 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_13);
1346                                                 ippp++;
1347                                                 *ippp = chk->rec.data.TSN_seq;
1348                                                 ippp++;
1349                                                 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
1350                                         }
1351                                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_13;
1352                                         sctp_abort_an_association(stcb->sctp_ep,
1353                                             stcb, SCTP_PEER_FAULTY, oper);
1354
1355                                         *abort_flag = 1;
1356                                         return;
1357
1358                                 }
1359                         }
1360                 }
1361         }
1362         /* Do we need to do some delivery? check */
1363         sctp_deliver_reasm_check(stcb, asoc);
1364 }
1365
1366 /*
1367  * This is an unfortunate routine. It checks to make sure a evil guy is not
1368  * stuffing us full of bad packet fragments. A broken peer could also do this
1369  * but this is doubtful. It is to bad I must worry about evil crackers sigh
1370  * :< more cycles.
1371  */
1372 static int
1373 sctp_does_tsn_belong_to_reasm(struct sctp_association *asoc,
1374     uint32_t TSN_seq)
1375 {
1376         struct sctp_tmit_chunk *at;
1377         uint32_t tsn_est;
1378
1379         TAILQ_FOREACH(at, &asoc->reasmqueue, sctp_next) {
1380                 if (compare_with_wrap(TSN_seq,
1381                     at->rec.data.TSN_seq, MAX_TSN)) {
1382                         /* is it one bigger? */
1383                         tsn_est = at->rec.data.TSN_seq + 1;
1384                         if (tsn_est == TSN_seq) {
1385                                 /* yep. It better be a last then */
1386                                 if ((at->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) !=
1387                                     SCTP_DATA_LAST_FRAG) {
1388                                         /*
1389                                          * Ok this guy belongs next to a guy
1390                                          * that is NOT last, it should be a
1391                                          * middle/last, not a complete
1392                                          * chunk.
1393                                          */
1394                                         return (1);
1395                                 } else {
1396                                         /*
1397                                          * This guy is ok since its a LAST
1398                                          * and the new chunk is a fully
1399                                          * self- contained one.
1400                                          */
1401                                         return (0);
1402                                 }
1403                         }
1404                 } else if (TSN_seq == at->rec.data.TSN_seq) {
1405                         /* Software error since I have a dup? */
1406                         return (1);
1407                 } else {
1408                         /*
1409                          * Ok, 'at' is larger than new chunk but does it
1410                          * need to be right before it.
1411                          */
1412                         tsn_est = TSN_seq + 1;
1413                         if (tsn_est == at->rec.data.TSN_seq) {
1414                                 /* Yep, It better be a first */
1415                                 if ((at->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) !=
1416                                     SCTP_DATA_FIRST_FRAG) {
1417                                         return (1);
1418                                 } else {
1419                                         return (0);
1420                                 }
1421                         }
1422                 }
1423         }
1424         return (0);
1425 }
1426
1427
1428 static int
1429 sctp_process_a_data_chunk(struct sctp_tcb *stcb, struct sctp_association *asoc,
1430     struct mbuf **m, int offset, struct sctp_data_chunk *ch, int chk_length,
1431     struct sctp_nets *net, uint32_t * high_tsn, int *abort_flag,
1432     int *break_flag, int last_chunk)
1433 {
1434         /* Process a data chunk */
1435         /* struct sctp_tmit_chunk *chk; */
1436         struct sctp_tmit_chunk *chk;
1437         uint32_t tsn, gap;
1438         struct mbuf *dmbuf;
1439         int indx, the_len;
1440         int need_reasm_check = 0;
1441         uint16_t strmno, strmseq;
1442         struct mbuf *oper;
1443         struct sctp_queued_to_read *control;
1444         int ordered;
1445         uint32_t protocol_id;
1446         uint8_t chunk_flags;
1447         struct sctp_stream_reset_list *liste;
1448
1449         chk = NULL;
1450         tsn = ntohl(ch->dp.tsn);
1451         chunk_flags = ch->ch.chunk_flags;
1452         protocol_id = ch->dp.protocol_id;
1453         ordered = ((ch->ch.chunk_flags & SCTP_DATA_UNORDERED) == 0);
1454         if (sctp_logging_level & SCTP_MAP_LOGGING_ENABLE) {
1455                 sctp_log_map(0, tsn, asoc->cumulative_tsn, SCTP_MAP_PREPARE_SLIDE);
1456         }
1457         if (stcb == NULL) {
1458                 return (0);
1459         }
1460         SCTP_LTRACE_CHK(stcb->sctp_ep, stcb, ch->ch.chunk_type, tsn);
1461         if (compare_with_wrap(asoc->cumulative_tsn, tsn, MAX_TSN) ||
1462             asoc->cumulative_tsn == tsn) {
1463                 /* It is a duplicate */
1464                 SCTP_STAT_INCR(sctps_recvdupdata);
1465                 if (asoc->numduptsns < SCTP_MAX_DUP_TSNS) {
1466                         /* Record a dup for the next outbound sack */
1467                         asoc->dup_tsns[asoc->numduptsns] = tsn;
1468                         asoc->numduptsns++;
1469                 }
1470                 return (0);
1471         }
1472         /* Calculate the number of TSN's between the base and this TSN */
1473         if (tsn >= asoc->mapping_array_base_tsn) {
1474                 gap = tsn - asoc->mapping_array_base_tsn;
1475         } else {
1476                 gap = (MAX_TSN - asoc->mapping_array_base_tsn) + tsn + 1;
1477         }
1478         if (gap >= (SCTP_MAPPING_ARRAY << 3)) {
1479                 /* Can't hold the bit in the mapping at max array, toss it */
1480                 return (0);
1481         }
1482         if (gap >= (uint32_t) (asoc->mapping_array_size << 3)) {
1483                 SCTP_TCB_LOCK_ASSERT(stcb);
1484                 if (sctp_expand_mapping_array(asoc, gap)) {
1485                         /* Can't expand, drop it */
1486                         return (0);
1487                 }
1488         }
1489         if (compare_with_wrap(tsn, *high_tsn, MAX_TSN)) {
1490                 *high_tsn = tsn;
1491         }
1492         /* See if we have received this one already */
1493         if (SCTP_IS_TSN_PRESENT(asoc->mapping_array, gap)) {
1494                 SCTP_STAT_INCR(sctps_recvdupdata);
1495                 if (asoc->numduptsns < SCTP_MAX_DUP_TSNS) {
1496                         /* Record a dup for the next outbound sack */
1497                         asoc->dup_tsns[asoc->numduptsns] = tsn;
1498                         asoc->numduptsns++;
1499                 }
1500                 asoc->send_sack = 1;
1501                 return (0);
1502         }
1503         /*
1504          * Check to see about the GONE flag, duplicates would cause a sack
1505          * to be sent up above
1506          */
1507         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
1508             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
1509             (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET))
1510             ) {
1511                 /*
1512                  * wait a minute, this guy is gone, there is no longer a
1513                  * receiver. Send peer an ABORT!
1514                  */
1515                 struct mbuf *op_err;
1516
1517                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
1518                 sctp_abort_an_association(stcb->sctp_ep, stcb, 0, op_err);
1519                 *abort_flag = 1;
1520                 return (0);
1521         }
1522         /*
1523          * Now before going further we see if there is room. If NOT then we
1524          * MAY let one through only IF this TSN is the one we are waiting
1525          * for on a partial delivery API.
1526          */
1527
1528         /* now do the tests */
1529         if (((asoc->cnt_on_all_streams +
1530             asoc->cnt_on_reasm_queue +
1531             asoc->cnt_msg_on_sb) > sctp_max_chunks_on_queue) ||
1532             (((int)asoc->my_rwnd) <= 0)) {
1533                 /*
1534                  * When we have NO room in the rwnd we check to make sure
1535                  * the reader is doing its job...
1536                  */
1537                 if (stcb->sctp_socket->so_rcv.sb_cc) {
1538                         /* some to read, wake-up */
1539                         sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
1540                 }
1541                 /* now is it in the mapping array of what we have accepted? */
1542                 if (compare_with_wrap(tsn,
1543                     asoc->highest_tsn_inside_map, MAX_TSN)) {
1544
1545                         /* Nope not in the valid range dump it */
1546                         SCTPDBG(SCTP_DEBUG_INDATA1, "My rwnd overrun1:tsn:%lx rwnd %lu sbspace:%ld\n",
1547                             (u_long)tsn, (u_long)asoc->my_rwnd,
1548                             sctp_sbspace(&stcb->asoc, &stcb->sctp_socket->so_rcv));
1549                         sctp_set_rwnd(stcb, asoc);
1550                         if ((asoc->cnt_on_all_streams +
1551                             asoc->cnt_on_reasm_queue +
1552                             asoc->cnt_msg_on_sb) > sctp_max_chunks_on_queue) {
1553                                 SCTP_STAT_INCR(sctps_datadropchklmt);
1554                         } else {
1555                                 SCTP_STAT_INCR(sctps_datadroprwnd);
1556                         }
1557                         indx = *break_flag;
1558                         *break_flag = 1;
1559                         return (0);
1560                 }
1561         }
1562         strmno = ntohs(ch->dp.stream_id);
1563         if (strmno >= asoc->streamincnt) {
1564                 struct sctp_paramhdr *phdr;
1565                 struct mbuf *mb;
1566
1567                 mb = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) * 2),
1568                     0, M_DONTWAIT, 1, MT_DATA);
1569                 if (mb != NULL) {
1570                         /* add some space up front so prepend will work well */
1571                         SCTP_BUF_RESV_UF(mb, sizeof(struct sctp_chunkhdr));
1572                         phdr = mtod(mb, struct sctp_paramhdr *);
1573                         /*
1574                          * Error causes are just param's and this one has
1575                          * two back to back phdr, one with the error type
1576                          * and size, the other with the streamid and a rsvd
1577                          */
1578                         SCTP_BUF_LEN(mb) = (sizeof(struct sctp_paramhdr) * 2);
1579                         phdr->param_type = htons(SCTP_CAUSE_INVALID_STREAM);
1580                         phdr->param_length =
1581                             htons(sizeof(struct sctp_paramhdr) * 2);
1582                         phdr++;
1583                         /* We insert the stream in the type field */
1584                         phdr->param_type = ch->dp.stream_id;
1585                         /* And set the length to 0 for the rsvd field */
1586                         phdr->param_length = 0;
1587                         sctp_queue_op_err(stcb, mb);
1588                 }
1589                 SCTP_STAT_INCR(sctps_badsid);
1590                 SCTP_TCB_LOCK_ASSERT(stcb);
1591                 SCTP_SET_TSN_PRESENT(asoc->mapping_array, gap);
1592                 if (compare_with_wrap(tsn, asoc->highest_tsn_inside_map, MAX_TSN)) {
1593                         /* we have a new high score */
1594                         asoc->highest_tsn_inside_map = tsn;
1595                         if (sctp_logging_level & SCTP_MAP_LOGGING_ENABLE) {
1596                                 sctp_log_map(0, 2, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
1597                         }
1598                 }
1599                 if (tsn == (asoc->cumulative_tsn + 1)) {
1600                         /* Update cum-ack */
1601                         asoc->cumulative_tsn = tsn;
1602                 }
1603                 return (0);
1604         }
1605         /*
1606          * Before we continue lets validate that we are not being fooled by
1607          * an evil attacker. We can only have 4k chunks based on our TSN
1608          * spread allowed by the mapping array 512 * 8 bits, so there is no
1609          * way our stream sequence numbers could have wrapped. We of course
1610          * only validate the FIRST fragment so the bit must be set.
1611          */
1612         strmseq = ntohs(ch->dp.stream_sequence);
1613 #ifdef SCTP_ASOCLOG_OF_TSNS
1614         SCTP_TCB_LOCK_ASSERT(stcb);
1615         if (asoc->tsn_in_at >= SCTP_TSN_LOG_SIZE) {
1616                 asoc->tsn_in_at = 0;
1617                 asoc->tsn_in_wrapped = 1;
1618         }
1619         asoc->in_tsnlog[asoc->tsn_in_at].tsn = tsn;
1620         asoc->in_tsnlog[asoc->tsn_in_at].strm = strmno;
1621         asoc->in_tsnlog[asoc->tsn_in_at].seq = strmseq;
1622         asoc->in_tsnlog[asoc->tsn_in_at].sz = chk_length;
1623         asoc->in_tsnlog[asoc->tsn_in_at].flgs = chunk_flags;
1624         asoc->in_tsnlog[asoc->tsn_in_at].stcb = (void *)stcb;
1625         asoc->in_tsnlog[asoc->tsn_in_at].in_pos = asoc->tsn_in_at;
1626         asoc->in_tsnlog[asoc->tsn_in_at].in_out = 1;
1627         asoc->tsn_in_at++;
1628 #endif
1629         if ((chunk_flags & SCTP_DATA_FIRST_FRAG) &&
1630             (TAILQ_EMPTY(&asoc->resetHead)) &&
1631             (chunk_flags & SCTP_DATA_UNORDERED) == 0 &&
1632             (compare_with_wrap(asoc->strmin[strmno].last_sequence_delivered,
1633             strmseq, MAX_SEQ) ||
1634             asoc->strmin[strmno].last_sequence_delivered == strmseq)) {
1635                 /* The incoming sseq is behind where we last delivered? */
1636                 SCTPDBG(SCTP_DEBUG_INDATA1, "EVIL/Broken-Dup S-SEQ:%d delivered:%d from peer, Abort!\n",
1637                     strmseq, asoc->strmin[strmno].last_sequence_delivered);
1638                 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
1639                     0, M_DONTWAIT, 1, MT_DATA);
1640                 if (oper) {
1641                         struct sctp_paramhdr *ph;
1642                         uint32_t *ippp;
1643
1644                         SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
1645                             (3 * sizeof(uint32_t));
1646                         ph = mtod(oper, struct sctp_paramhdr *);
1647                         ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
1648                         ph->param_length = htons(SCTP_BUF_LEN(oper));
1649                         ippp = (uint32_t *) (ph + 1);
1650                         *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_14);
1651                         ippp++;
1652                         *ippp = tsn;
1653                         ippp++;
1654                         *ippp = ((strmno << 16) | strmseq);
1655
1656                 }
1657                 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_14;
1658                 sctp_abort_an_association(stcb->sctp_ep, stcb,
1659                     SCTP_PEER_FAULTY, oper);
1660                 *abort_flag = 1;
1661                 return (0);
1662         }
1663         /************************************
1664          * From here down we may find ch-> invalid
1665          * so its a good idea NOT to use it.
1666          *************************************/
1667
1668         the_len = (chk_length - sizeof(struct sctp_data_chunk));
1669         if (last_chunk == 0) {
1670                 dmbuf = SCTP_M_COPYM(*m,
1671                     (offset + sizeof(struct sctp_data_chunk)),
1672                     the_len, M_DONTWAIT);
1673 #ifdef SCTP_MBUF_LOGGING
1674                 if (sctp_logging_level & SCTP_MBUF_LOGGING_ENABLE) {
1675                         struct mbuf *mat;
1676
1677                         mat = dmbuf;
1678                         while (mat) {
1679                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
1680                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
1681                                 }
1682                                 mat = SCTP_BUF_NEXT(mat);
1683                         }
1684                 }
1685 #endif
1686         } else {
1687                 /* We can steal the last chunk */
1688                 int l_len;
1689
1690                 dmbuf = *m;
1691                 /* lop off the top part */
1692                 m_adj(dmbuf, (offset + sizeof(struct sctp_data_chunk)));
1693                 if (SCTP_BUF_NEXT(dmbuf) == NULL) {
1694                         l_len = SCTP_BUF_LEN(dmbuf);
1695                 } else {
1696                         /*
1697                          * need to count up the size hopefully does not hit
1698                          * this to often :-0
1699                          */
1700                         struct mbuf *lat;
1701
1702                         l_len = 0;
1703                         lat = dmbuf;
1704                         while (lat) {
1705                                 l_len += SCTP_BUF_LEN(lat);
1706                                 lat = SCTP_BUF_NEXT(lat);
1707                         }
1708                 }
1709                 if (l_len > the_len) {
1710                         /* Trim the end round bytes off  too */
1711                         m_adj(dmbuf, -(l_len - the_len));
1712                 }
1713         }
1714         if (dmbuf == NULL) {
1715                 SCTP_STAT_INCR(sctps_nomem);
1716                 return (0);
1717         }
1718         if ((chunk_flags & SCTP_DATA_NOT_FRAG) == SCTP_DATA_NOT_FRAG &&
1719             asoc->fragmented_delivery_inprogress == 0 &&
1720             TAILQ_EMPTY(&asoc->resetHead) &&
1721             ((ordered == 0) ||
1722             ((asoc->strmin[strmno].last_sequence_delivered + 1) == strmseq &&
1723             TAILQ_EMPTY(&asoc->strmin[strmno].inqueue)))) {
1724                 /* Candidate for express delivery */
1725                 /*
1726                  * Its not fragmented, No PD-API is up, Nothing in the
1727                  * delivery queue, Its un-ordered OR ordered and the next to
1728                  * deliver AND nothing else is stuck on the stream queue,
1729                  * And there is room for it in the socket buffer. Lets just
1730                  * stuff it up the buffer....
1731                  */
1732
1733                 /* It would be nice to avoid this copy if we could :< */
1734                 sctp_alloc_a_readq(stcb, control);
1735                 sctp_build_readq_entry_mac(control, stcb, asoc->context, net, tsn,
1736                     protocol_id,
1737                     stcb->asoc.context,
1738                     strmno, strmseq,
1739                     chunk_flags,
1740                     dmbuf);
1741                 if (control == NULL) {
1742                         goto failed_express_del;
1743                 }
1744                 sctp_add_to_readq(stcb->sctp_ep, stcb, control, &stcb->sctp_socket->so_rcv, 1);
1745                 if ((chunk_flags & SCTP_DATA_UNORDERED) == 0) {
1746                         /* for ordered, bump what we delivered */
1747                         asoc->strmin[strmno].last_sequence_delivered++;
1748                 }
1749                 SCTP_STAT_INCR(sctps_recvexpress);
1750                 if (sctp_logging_level & SCTP_STR_LOGGING_ENABLE) {
1751                         sctp_log_strm_del_alt(stcb, tsn, strmseq, strmno,
1752                             SCTP_STR_LOG_FROM_EXPRS_DEL);
1753                 }
1754                 control = NULL;
1755                 goto finish_express_del;
1756         }
1757 failed_express_del:
1758         /* If we reach here this is a new chunk */
1759         chk = NULL;
1760         control = NULL;
1761         /* Express for fragmented delivery? */
1762         if ((asoc->fragmented_delivery_inprogress) &&
1763             (stcb->asoc.control_pdapi) &&
1764             (asoc->str_of_pdapi == strmno) &&
1765             (asoc->ssn_of_pdapi == strmseq)
1766             ) {
1767                 control = stcb->asoc.control_pdapi;
1768                 if ((chunk_flags & SCTP_DATA_FIRST_FRAG) == SCTP_DATA_FIRST_FRAG) {
1769                         /* Can't be another first? */
1770                         goto failed_pdapi_express_del;
1771                 }
1772                 if (tsn == (control->sinfo_tsn + 1)) {
1773                         /* Yep, we can add it on */
1774                         int end = 0;
1775                         uint32_t cumack;
1776
1777                         if (chunk_flags & SCTP_DATA_LAST_FRAG) {
1778                                 end = 1;
1779                         }
1780                         cumack = asoc->cumulative_tsn;
1781                         if ((cumack + 1) == tsn)
1782                                 cumack = tsn;
1783
1784                         if (sctp_append_to_readq(stcb->sctp_ep, stcb, control, dmbuf, end,
1785                             tsn,
1786                             &stcb->sctp_socket->so_rcv)) {
1787                                 SCTP_PRINTF("Append fails end:%d\n", end);
1788                                 goto failed_pdapi_express_del;
1789                         }
1790                         SCTP_STAT_INCR(sctps_recvexpressm);
1791                         control->sinfo_tsn = tsn;
1792                         asoc->tsn_last_delivered = tsn;
1793                         asoc->fragment_flags = chunk_flags;
1794                         asoc->tsn_of_pdapi_last_delivered = tsn;
1795                         asoc->last_flags_delivered = chunk_flags;
1796                         asoc->last_strm_seq_delivered = strmseq;
1797                         asoc->last_strm_no_delivered = strmno;
1798                         if (end) {
1799                                 /* clean up the flags and such */
1800                                 asoc->fragmented_delivery_inprogress = 0;
1801                                 if ((chunk_flags & SCTP_DATA_UNORDERED) == 0) {
1802                                         asoc->strmin[strmno].last_sequence_delivered++;
1803                                 }
1804                                 stcb->asoc.control_pdapi = NULL;
1805                                 if (TAILQ_EMPTY(&asoc->reasmqueue) == 0) {
1806                                         /*
1807                                          * There could be another message
1808                                          * ready
1809                                          */
1810                                         need_reasm_check = 1;
1811                                 }
1812                         }
1813                         control = NULL;
1814                         goto finish_express_del;
1815                 }
1816         }
1817 failed_pdapi_express_del:
1818         control = NULL;
1819         if ((chunk_flags & SCTP_DATA_NOT_FRAG) != SCTP_DATA_NOT_FRAG) {
1820                 sctp_alloc_a_chunk(stcb, chk);
1821                 if (chk == NULL) {
1822                         /* No memory so we drop the chunk */
1823                         SCTP_STAT_INCR(sctps_nomem);
1824                         if (last_chunk == 0) {
1825                                 /* we copied it, free the copy */
1826                                 sctp_m_freem(dmbuf);
1827                         }
1828                         return (0);
1829                 }
1830                 chk->rec.data.TSN_seq = tsn;
1831                 chk->no_fr_allowed = 0;
1832                 chk->rec.data.stream_seq = strmseq;
1833                 chk->rec.data.stream_number = strmno;
1834                 chk->rec.data.payloadtype = protocol_id;
1835                 chk->rec.data.context = stcb->asoc.context;
1836                 chk->rec.data.doing_fast_retransmit = 0;
1837                 chk->rec.data.rcv_flags = chunk_flags;
1838                 chk->asoc = asoc;
1839                 chk->send_size = the_len;
1840                 chk->whoTo = net;
1841                 atomic_add_int(&net->ref_count, 1);
1842                 chk->data = dmbuf;
1843         } else {
1844                 sctp_alloc_a_readq(stcb, control);
1845                 sctp_build_readq_entry_mac(control, stcb, asoc->context, net, tsn,
1846                     protocol_id,
1847                     stcb->asoc.context,
1848                     strmno, strmseq,
1849                     chunk_flags,
1850                     dmbuf);
1851                 if (control == NULL) {
1852                         /* No memory so we drop the chunk */
1853                         SCTP_STAT_INCR(sctps_nomem);
1854                         if (last_chunk == 0) {
1855                                 /* we copied it, free the copy */
1856                                 sctp_m_freem(dmbuf);
1857                         }
1858                         return (0);
1859                 }
1860                 control->length = the_len;
1861         }
1862
1863         /* Mark it as received */
1864         /* Now queue it where it belongs */
1865         if (control != NULL) {
1866                 /* First a sanity check */
1867                 if (asoc->fragmented_delivery_inprogress) {
1868                         /*
1869                          * Ok, we have a fragmented delivery in progress if
1870                          * this chunk is next to deliver OR belongs in our
1871                          * view to the reassembly, the peer is evil or
1872                          * broken.
1873                          */
1874                         uint32_t estimate_tsn;
1875
1876                         estimate_tsn = asoc->tsn_last_delivered + 1;
1877                         if (TAILQ_EMPTY(&asoc->reasmqueue) &&
1878                             (estimate_tsn == control->sinfo_tsn)) {
1879                                 /* Evil/Broke peer */
1880                                 sctp_m_freem(control->data);
1881                                 control->data = NULL;
1882                                 if (control->whoFrom) {
1883                                         sctp_free_remote_addr(control->whoFrom);
1884                                         control->whoFrom = NULL;
1885                                 }
1886                                 sctp_free_a_readq(stcb, control);
1887                                 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
1888                                     0, M_DONTWAIT, 1, MT_DATA);
1889                                 if (oper) {
1890                                         struct sctp_paramhdr *ph;
1891                                         uint32_t *ippp;
1892
1893                                         SCTP_BUF_LEN(oper) =
1894                                             sizeof(struct sctp_paramhdr) +
1895                                             (3 * sizeof(uint32_t));
1896                                         ph = mtod(oper, struct sctp_paramhdr *);
1897                                         ph->param_type =
1898                                             htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
1899                                         ph->param_length = htons(SCTP_BUF_LEN(oper));
1900                                         ippp = (uint32_t *) (ph + 1);
1901                                         *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_15);
1902                                         ippp++;
1903                                         *ippp = tsn;
1904                                         ippp++;
1905                                         *ippp = ((strmno << 16) | strmseq);
1906                                 }
1907                                 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_15;
1908                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
1909                                     SCTP_PEER_FAULTY, oper);
1910
1911                                 *abort_flag = 1;
1912                                 return (0);
1913                         } else {
1914                                 if (sctp_does_tsn_belong_to_reasm(asoc, control->sinfo_tsn)) {
1915                                         sctp_m_freem(control->data);
1916                                         control->data = NULL;
1917                                         if (control->whoFrom) {
1918                                                 sctp_free_remote_addr(control->whoFrom);
1919                                                 control->whoFrom = NULL;
1920                                         }
1921                                         sctp_free_a_readq(stcb, control);
1922
1923                                         oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
1924                                             0, M_DONTWAIT, 1, MT_DATA);
1925                                         if (oper) {
1926                                                 struct sctp_paramhdr *ph;
1927                                                 uint32_t *ippp;
1928
1929                                                 SCTP_BUF_LEN(oper) =
1930                                                     sizeof(struct sctp_paramhdr) +
1931                                                     (3 * sizeof(uint32_t));
1932                                                 ph = mtod(oper,
1933                                                     struct sctp_paramhdr *);
1934                                                 ph->param_type =
1935                                                     htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
1936                                                 ph->param_length =
1937                                                     htons(SCTP_BUF_LEN(oper));
1938                                                 ippp = (uint32_t *) (ph + 1);
1939                                                 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_16);
1940                                                 ippp++;
1941                                                 *ippp = tsn;
1942                                                 ippp++;
1943                                                 *ippp = ((strmno << 16) | strmseq);
1944                                         }
1945                                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_16;
1946                                         sctp_abort_an_association(stcb->sctp_ep,
1947                                             stcb, SCTP_PEER_FAULTY, oper);
1948
1949                                         *abort_flag = 1;
1950                                         return (0);
1951                                 }
1952                         }
1953                 } else {
1954                         /* No PDAPI running */
1955                         if (!TAILQ_EMPTY(&asoc->reasmqueue)) {
1956                                 /*
1957                                  * Reassembly queue is NOT empty validate
1958                                  * that this tsn does not need to be in
1959                                  * reasembly queue. If it does then our peer
1960                                  * is broken or evil.
1961                                  */
1962                                 if (sctp_does_tsn_belong_to_reasm(asoc, control->sinfo_tsn)) {
1963                                         sctp_m_freem(control->data);
1964                                         control->data = NULL;
1965                                         if (control->whoFrom) {
1966                                                 sctp_free_remote_addr(control->whoFrom);
1967                                                 control->whoFrom = NULL;
1968                                         }
1969                                         sctp_free_a_readq(stcb, control);
1970                                         oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
1971                                             0, M_DONTWAIT, 1, MT_DATA);
1972                                         if (oper) {
1973                                                 struct sctp_paramhdr *ph;
1974                                                 uint32_t *ippp;
1975
1976                                                 SCTP_BUF_LEN(oper) =
1977                                                     sizeof(struct sctp_paramhdr) +
1978                                                     (3 * sizeof(uint32_t));
1979                                                 ph = mtod(oper,
1980                                                     struct sctp_paramhdr *);
1981                                                 ph->param_type =
1982                                                     htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
1983                                                 ph->param_length =
1984                                                     htons(SCTP_BUF_LEN(oper));
1985                                                 ippp = (uint32_t *) (ph + 1);
1986                                                 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_17);
1987                                                 ippp++;
1988                                                 *ippp = tsn;
1989                                                 ippp++;
1990                                                 *ippp = ((strmno << 16) | strmseq);
1991                                         }
1992                                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_17;
1993                                         sctp_abort_an_association(stcb->sctp_ep,
1994                                             stcb, SCTP_PEER_FAULTY, oper);
1995
1996                                         *abort_flag = 1;
1997                                         return (0);
1998                                 }
1999                         }
2000                 }
2001                 /* ok, if we reach here we have passed the sanity checks */
2002                 if (chunk_flags & SCTP_DATA_UNORDERED) {
2003                         /* queue directly into socket buffer */
2004                         sctp_add_to_readq(stcb->sctp_ep, stcb,
2005                             control,
2006                             &stcb->sctp_socket->so_rcv, 1);
2007                 } else {
2008                         /*
2009                          * Special check for when streams are resetting. We
2010                          * could be more smart about this and check the
2011                          * actual stream to see if it is not being reset..
2012                          * that way we would not create a HOLB when amongst
2013                          * streams being reset and those not being reset.
2014                          *
2015                          * We take complete messages that have a stream reset
2016                          * intervening (aka the TSN is after where our
2017                          * cum-ack needs to be) off and put them on a
2018                          * pending_reply_queue. The reassembly ones we do
2019                          * not have to worry about since they are all sorted
2020                          * and proceessed by TSN order. It is only the
2021                          * singletons I must worry about.
2022                          */
2023                         if (((liste = TAILQ_FIRST(&asoc->resetHead)) != NULL) &&
2024                             ((compare_with_wrap(tsn, liste->tsn, MAX_TSN)))
2025                             ) {
2026                                 /*
2027                                  * yep its past where we need to reset... go
2028                                  * ahead and queue it.
2029                                  */
2030                                 if (TAILQ_EMPTY(&asoc->pending_reply_queue)) {
2031                                         /* first one on */
2032                                         TAILQ_INSERT_TAIL(&asoc->pending_reply_queue, control, next);
2033                                 } else {
2034                                         struct sctp_queued_to_read *ctlOn;
2035                                         unsigned char inserted = 0;
2036
2037                                         ctlOn = TAILQ_FIRST(&asoc->pending_reply_queue);
2038                                         while (ctlOn) {
2039                                                 if (compare_with_wrap(control->sinfo_tsn,
2040                                                     ctlOn->sinfo_tsn, MAX_TSN)) {
2041                                                         ctlOn = TAILQ_NEXT(ctlOn, next);
2042                                                 } else {
2043                                                         /* found it */
2044                                                         TAILQ_INSERT_BEFORE(ctlOn, control, next);
2045                                                         inserted = 1;
2046                                                         break;
2047                                                 }
2048                                         }
2049                                         if (inserted == 0) {
2050                                                 /*
2051                                                  * must be put at end, use
2052                                                  * prevP (all setup from
2053                                                  * loop) to setup nextP.
2054                                                  */
2055                                                 TAILQ_INSERT_TAIL(&asoc->pending_reply_queue, control, next);
2056                                         }
2057                                 }
2058                         } else {
2059                                 sctp_queue_data_to_stream(stcb, asoc, control, abort_flag);
2060                                 if (*abort_flag) {
2061                                         return (0);
2062                                 }
2063                         }
2064                 }
2065         } else {
2066                 /* Into the re-assembly queue */
2067                 sctp_queue_data_for_reasm(stcb, asoc, chk, abort_flag);
2068                 if (*abort_flag) {
2069                         /*
2070                          * the assoc is now gone and chk was put onto the
2071                          * reasm queue, which has all been freed.
2072                          */
2073                         *m = NULL;
2074                         return (0);
2075                 }
2076         }
2077 finish_express_del:
2078         if (compare_with_wrap(tsn, asoc->highest_tsn_inside_map, MAX_TSN)) {
2079                 /* we have a new high score */
2080                 asoc->highest_tsn_inside_map = tsn;
2081                 if (sctp_logging_level & SCTP_MAP_LOGGING_ENABLE) {
2082                         sctp_log_map(0, 2, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
2083                 }
2084         }
2085         if (tsn == (asoc->cumulative_tsn + 1)) {
2086                 /* Update cum-ack */
2087                 asoc->cumulative_tsn = tsn;
2088         }
2089         if (last_chunk) {
2090                 *m = NULL;
2091         }
2092         if (ordered) {
2093                 SCTP_STAT_INCR_COUNTER64(sctps_inorderchunks);
2094         } else {
2095                 SCTP_STAT_INCR_COUNTER64(sctps_inunorderchunks);
2096         }
2097         SCTP_STAT_INCR(sctps_recvdata);
2098         /* Set it present please */
2099         if (sctp_logging_level & SCTP_STR_LOGGING_ENABLE) {
2100                 sctp_log_strm_del_alt(stcb, tsn, strmseq, strmno, SCTP_STR_LOG_FROM_MARK_TSN);
2101         }
2102         if (sctp_logging_level & SCTP_MAP_LOGGING_ENABLE) {
2103                 sctp_log_map(asoc->mapping_array_base_tsn, asoc->cumulative_tsn,
2104                     asoc->highest_tsn_inside_map, SCTP_MAP_PREPARE_SLIDE);
2105         }
2106         SCTP_TCB_LOCK_ASSERT(stcb);
2107         SCTP_SET_TSN_PRESENT(asoc->mapping_array, gap);
2108         /* check the special flag for stream resets */
2109         if (((liste = TAILQ_FIRST(&asoc->resetHead)) != NULL) &&
2110             ((compare_with_wrap(asoc->cumulative_tsn, liste->tsn, MAX_TSN)) ||
2111             (asoc->cumulative_tsn == liste->tsn))
2112             ) {
2113                 /*
2114                  * we have finished working through the backlogged TSN's now
2115                  * time to reset streams. 1: call reset function. 2: free
2116                  * pending_reply space 3: distribute any chunks in
2117                  * pending_reply_queue.
2118                  */
2119                 struct sctp_queued_to_read *ctl;
2120
2121                 sctp_reset_in_stream(stcb, liste->number_entries, liste->req.list_of_streams);
2122                 TAILQ_REMOVE(&asoc->resetHead, liste, next_resp);
2123                 SCTP_FREE(liste, SCTP_M_STRESET);
2124                 /* sa_ignore FREED_MEMORY */
2125                 liste = TAILQ_FIRST(&asoc->resetHead);
2126                 ctl = TAILQ_FIRST(&asoc->pending_reply_queue);
2127                 if (ctl && (liste == NULL)) {
2128                         /* All can be removed */
2129                         while (ctl) {
2130                                 TAILQ_REMOVE(&asoc->pending_reply_queue, ctl, next);
2131                                 sctp_queue_data_to_stream(stcb, asoc, ctl, abort_flag);
2132                                 if (*abort_flag) {
2133                                         return (0);
2134                                 }
2135                                 ctl = TAILQ_FIRST(&asoc->pending_reply_queue);
2136                         }
2137                 } else if (ctl) {
2138                         /* more than one in queue */
2139                         while (!compare_with_wrap(ctl->sinfo_tsn, liste->tsn, MAX_TSN)) {
2140                                 /*
2141                                  * if ctl->sinfo_tsn is <= liste->tsn we can
2142                                  * process it which is the NOT of
2143                                  * ctl->sinfo_tsn > liste->tsn
2144                                  */
2145                                 TAILQ_REMOVE(&asoc->pending_reply_queue, ctl, next);
2146                                 sctp_queue_data_to_stream(stcb, asoc, ctl, abort_flag);
2147                                 if (*abort_flag) {
2148                                         return (0);
2149                                 }
2150                                 ctl = TAILQ_FIRST(&asoc->pending_reply_queue);
2151                         }
2152                 }
2153                 /*
2154                  * Now service re-assembly to pick up anything that has been
2155                  * held on reassembly queue?
2156                  */
2157                 sctp_deliver_reasm_check(stcb, asoc);
2158                 need_reasm_check = 0;
2159         }
2160         if (need_reasm_check) {
2161                 /* Another one waits ? */
2162                 sctp_deliver_reasm_check(stcb, asoc);
2163         }
2164         return (1);
2165 }
2166
2167 int8_t sctp_map_lookup_tab[256] = {
2168         -1, 0, -1, 1, -1, 0, -1, 2,
2169         -1, 0, -1, 1, -1, 0, -1, 3,
2170         -1, 0, -1, 1, -1, 0, -1, 2,
2171         -1, 0, -1, 1, -1, 0, -1, 4,
2172         -1, 0, -1, 1, -1, 0, -1, 2,
2173         -1, 0, -1, 1, -1, 0, -1, 3,
2174         -1, 0, -1, 1, -1, 0, -1, 2,
2175         -1, 0, -1, 1, -1, 0, -1, 5,
2176         -1, 0, -1, 1, -1, 0, -1, 2,
2177         -1, 0, -1, 1, -1, 0, -1, 3,
2178         -1, 0, -1, 1, -1, 0, -1, 2,
2179         -1, 0, -1, 1, -1, 0, -1, 4,
2180         -1, 0, -1, 1, -1, 0, -1, 2,
2181         -1, 0, -1, 1, -1, 0, -1, 3,
2182         -1, 0, -1, 1, -1, 0, -1, 2,
2183         -1, 0, -1, 1, -1, 0, -1, 6,
2184         -1, 0, -1, 1, -1, 0, -1, 2,
2185         -1, 0, -1, 1, -1, 0, -1, 3,
2186         -1, 0, -1, 1, -1, 0, -1, 2,
2187         -1, 0, -1, 1, -1, 0, -1, 4,
2188         -1, 0, -1, 1, -1, 0, -1, 2,
2189         -1, 0, -1, 1, -1, 0, -1, 3,
2190         -1, 0, -1, 1, -1, 0, -1, 2,
2191         -1, 0, -1, 1, -1, 0, -1, 5,
2192         -1, 0, -1, 1, -1, 0, -1, 2,
2193         -1, 0, -1, 1, -1, 0, -1, 3,
2194         -1, 0, -1, 1, -1, 0, -1, 2,
2195         -1, 0, -1, 1, -1, 0, -1, 4,
2196         -1, 0, -1, 1, -1, 0, -1, 2,
2197         -1, 0, -1, 1, -1, 0, -1, 3,
2198         -1, 0, -1, 1, -1, 0, -1, 2,
2199         -1, 0, -1, 1, -1, 0, -1, 7,
2200 };
2201
2202
2203 void
2204 sctp_sack_check(struct sctp_tcb *stcb, int ok_to_sack, int was_a_gap, int *abort_flag)
2205 {
2206         /*
2207          * Now we also need to check the mapping array in a couple of ways.
2208          * 1) Did we move the cum-ack point?
2209          */
2210         struct sctp_association *asoc;
2211         int i, at;
2212         int all_ones, last_all_ones = 0;
2213         int slide_from, slide_end, lgap, distance;
2214         uint32_t old_cumack, old_base, old_highest;
2215         unsigned char aux_array[64];
2216
2217
2218         asoc = &stcb->asoc;
2219         at = 0;
2220
2221         old_cumack = asoc->cumulative_tsn;
2222         old_base = asoc->mapping_array_base_tsn;
2223         old_highest = asoc->highest_tsn_inside_map;
2224         if (asoc->mapping_array_size < 64)
2225                 memcpy(aux_array, asoc->mapping_array,
2226                     asoc->mapping_array_size);
2227         else
2228                 memcpy(aux_array, asoc->mapping_array, 64);
2229
2230         /*
2231          * We could probably improve this a small bit by calculating the
2232          * offset of the current cum-ack as the starting point.
2233          */
2234         all_ones = 1;
2235         at = 0;
2236         for (i = 0; i < stcb->asoc.mapping_array_size; i++) {
2237
2238                 if (asoc->mapping_array[i] == 0xff) {
2239                         at += 8;
2240                         last_all_ones = 1;
2241                 } else {
2242                         /* there is a 0 bit */
2243                         all_ones = 0;
2244                         at += sctp_map_lookup_tab[asoc->mapping_array[i]];
2245                         last_all_ones = 0;
2246                         break;
2247                 }
2248         }
2249         asoc->cumulative_tsn = asoc->mapping_array_base_tsn + (at - last_all_ones);
2250         /* at is one off, since in the table a embedded -1 is present */
2251         at++;
2252
2253         if (compare_with_wrap(asoc->cumulative_tsn,
2254             asoc->highest_tsn_inside_map,
2255             MAX_TSN)) {
2256 #ifdef INVARIANTS
2257                 panic("huh, cumack greater than high-tsn in map");
2258 #else
2259                 SCTP_PRINTF("huh, cumack greater than high-tsn in map - should panic?\n");
2260                 asoc->highest_tsn_inside_map = asoc->cumulative_tsn;
2261 #endif
2262         }
2263         if (all_ones ||
2264             (asoc->cumulative_tsn == asoc->highest_tsn_inside_map && at >= 8)) {
2265                 /* The complete array was completed by a single FR */
2266                 /* higest becomes the cum-ack */
2267                 int clr;
2268
2269                 asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
2270                 /* clear the array */
2271                 if (all_ones)
2272                         clr = asoc->mapping_array_size;
2273                 else {
2274                         clr = (at >> 3) + 1;
2275                         /*
2276                          * this should be the allones case but just in case
2277                          * :>
2278                          */
2279                         if (clr > asoc->mapping_array_size)
2280                                 clr = asoc->mapping_array_size;
2281                 }
2282                 memset(asoc->mapping_array, 0, clr);
2283                 /* base becomes one ahead of the cum-ack */
2284                 asoc->mapping_array_base_tsn = asoc->cumulative_tsn + 1;
2285                 if (sctp_logging_level & SCTP_MAP_LOGGING_ENABLE) {
2286                         sctp_log_map(old_base, old_cumack, old_highest,
2287                             SCTP_MAP_PREPARE_SLIDE);
2288                         sctp_log_map(asoc->mapping_array_base_tsn, asoc->cumulative_tsn,
2289                             asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_CLEARED);
2290                 }
2291         } else if (at >= 8) {
2292                 /* we can slide the mapping array down */
2293                 /* Calculate the new byte postion we can move down */
2294                 slide_from = at >> 3;
2295                 /*
2296                  * now calculate the ceiling of the move using our highest
2297                  * TSN value
2298                  */
2299                 if (asoc->highest_tsn_inside_map >= asoc->mapping_array_base_tsn) {
2300                         lgap = asoc->highest_tsn_inside_map -
2301                             asoc->mapping_array_base_tsn;
2302                 } else {
2303                         lgap = (MAX_TSN - asoc->mapping_array_base_tsn) +
2304                             asoc->highest_tsn_inside_map + 1;
2305                 }
2306                 slide_end = lgap >> 3;
2307                 if (slide_end < slide_from) {
2308                         panic("impossible slide");
2309                 }
2310                 distance = (slide_end - slide_from) + 1;
2311                 if (sctp_logging_level & SCTP_MAP_LOGGING_ENABLE) {
2312                         sctp_log_map(old_base, old_cumack, old_highest,
2313                             SCTP_MAP_PREPARE_SLIDE);
2314                         sctp_log_map((uint32_t) slide_from, (uint32_t) slide_end,
2315                             (uint32_t) lgap, SCTP_MAP_SLIDE_FROM);
2316                 }
2317                 if (distance + slide_from > asoc->mapping_array_size ||
2318                     distance < 0) {
2319                         /*
2320                          * Here we do NOT slide forward the array so that
2321                          * hopefully when more data comes in to fill it up
2322                          * we will be able to slide it forward. Really I
2323                          * don't think this should happen :-0
2324                          */
2325
2326                         if (sctp_logging_level & SCTP_MAP_LOGGING_ENABLE) {
2327                                 sctp_log_map((uint32_t) distance, (uint32_t) slide_from,
2328                                     (uint32_t) asoc->mapping_array_size,
2329                                     SCTP_MAP_SLIDE_NONE);
2330                         }
2331                 } else {
2332                         int ii;
2333
2334                         for (ii = 0; ii < distance; ii++) {
2335                                 asoc->mapping_array[ii] =
2336                                     asoc->mapping_array[slide_from + ii];
2337                         }
2338                         for (ii = distance; ii <= slide_end; ii++) {
2339                                 asoc->mapping_array[ii] = 0;
2340                         }
2341                         asoc->mapping_array_base_tsn += (slide_from << 3);
2342                         if (sctp_logging_level & SCTP_MAP_LOGGING_ENABLE) {
2343                                 sctp_log_map(asoc->mapping_array_base_tsn,
2344                                     asoc->cumulative_tsn, asoc->highest_tsn_inside_map,
2345                                     SCTP_MAP_SLIDE_RESULT);
2346                         }
2347                 }
2348         }
2349         /*
2350          * Now we need to see if we need to queue a sack or just start the
2351          * timer (if allowed).
2352          */
2353         if (ok_to_sack) {
2354                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
2355                         /*
2356                          * Ok special case, in SHUTDOWN-SENT case. here we
2357                          * maker sure SACK timer is off and instead send a
2358                          * SHUTDOWN and a SACK
2359                          */
2360                         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
2361                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
2362                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_INDATA + SCTP_LOC_18);
2363                         }
2364                         sctp_send_shutdown(stcb, stcb->asoc.primary_destination);
2365                         sctp_send_sack(stcb);
2366                 } else {
2367                         int is_a_gap;
2368
2369                         /* is there a gap now ? */
2370                         is_a_gap = compare_with_wrap(stcb->asoc.highest_tsn_inside_map,
2371                             stcb->asoc.cumulative_tsn, MAX_TSN);
2372
2373                         /*
2374                          * CMT DAC algorithm: increase number of packets
2375                          * received since last ack
2376                          */
2377                         stcb->asoc.cmt_dac_pkts_rcvd++;
2378
2379                         if ((stcb->asoc.send_sack == 1) ||      /* We need to send a
2380                                                                  * SACK */
2381                             ((was_a_gap) && (is_a_gap == 0)) || /* was a gap, but no
2382                                                                  * longer is one */
2383                             (stcb->asoc.numduptsns) ||  /* we have dup's */
2384                             (is_a_gap) ||       /* is still a gap */
2385                             (stcb->asoc.delayed_ack == 0) ||    /* Delayed sack disabled */
2386                             (stcb->asoc.data_pkts_seen >= stcb->asoc.sack_freq) /* hit limit of pkts */
2387                             ) {
2388
2389                                 if ((sctp_cmt_on_off) && (sctp_cmt_use_dac) &&
2390                                     (stcb->asoc.send_sack == 0) &&
2391                                     (stcb->asoc.numduptsns == 0) &&
2392                                     (stcb->asoc.delayed_ack) &&
2393                                     (!SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer))) {
2394
2395                                         /*
2396                                          * CMT DAC algorithm: With CMT,
2397                                          * delay acks even in the face of
2398                                          *
2399                                          * reordering. Therefore, if acks that
2400                                          * do not have to be sent because of
2401                                          * the above reasons, will be
2402                                          * delayed. That is, acks that would
2403                                          * have been sent due to gap reports
2404                                          * will be delayed with DAC. Start
2405                                          * the delayed ack timer.
2406                                          */
2407                                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
2408                                             stcb->sctp_ep, stcb, NULL);
2409                                 } else {
2410                                         /*
2411                                          * Ok we must build a SACK since the
2412                                          * timer is pending, we got our
2413                                          * first packet OR there are gaps or
2414                                          * duplicates.
2415                                          */
2416                                         (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
2417                                         sctp_send_sack(stcb);
2418                                 }
2419                         } else {
2420                                 if (!SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
2421                                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
2422                                             stcb->sctp_ep, stcb, NULL);
2423                                 }
2424                         }
2425                 }
2426         }
2427 }
2428
2429 void
2430 sctp_service_queues(struct sctp_tcb *stcb, struct sctp_association *asoc)
2431 {
2432         struct sctp_tmit_chunk *chk;
2433         uint32_t tsize;
2434         uint16_t nxt_todel;
2435
2436         if (asoc->fragmented_delivery_inprogress) {
2437                 sctp_service_reassembly(stcb, asoc);
2438         }
2439         /* Can we proceed further, i.e. the PD-API is complete */
2440         if (asoc->fragmented_delivery_inprogress) {
2441                 /* no */
2442                 return;
2443         }
2444         /*
2445          * Now is there some other chunk I can deliver from the reassembly
2446          * queue.
2447          */
2448 doit_again:
2449         chk = TAILQ_FIRST(&asoc->reasmqueue);
2450         if (chk == NULL) {
2451                 asoc->size_on_reasm_queue = 0;
2452                 asoc->cnt_on_reasm_queue = 0;
2453                 return;
2454         }
2455         nxt_todel = asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered + 1;
2456         if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) &&
2457             ((nxt_todel == chk->rec.data.stream_seq) ||
2458             (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED))) {
2459                 /*
2460                  * Yep the first one is here. We setup to start reception,
2461                  * by backing down the TSN just in case we can't deliver.
2462                  */
2463
2464                 /*
2465                  * Before we start though either all of the message should
2466                  * be here or 1/4 the socket buffer max or nothing on the
2467                  * delivery queue and something can be delivered.
2468                  */
2469                 if ((sctp_is_all_msg_on_reasm(asoc, &tsize) ||
2470                     (tsize > stcb->sctp_ep->partial_delivery_point))) {
2471                         asoc->fragmented_delivery_inprogress = 1;
2472                         asoc->tsn_last_delivered = chk->rec.data.TSN_seq - 1;
2473                         asoc->str_of_pdapi = chk->rec.data.stream_number;
2474                         asoc->ssn_of_pdapi = chk->rec.data.stream_seq;
2475                         asoc->pdapi_ppid = chk->rec.data.payloadtype;
2476                         asoc->fragment_flags = chk->rec.data.rcv_flags;
2477                         sctp_service_reassembly(stcb, asoc);
2478                         if (asoc->fragmented_delivery_inprogress == 0) {
2479                                 goto doit_again;
2480                         }
2481                 }
2482         }
2483 }
2484
2485 int
2486 sctp_process_data(struct mbuf **mm, int iphlen, int *offset, int length,
2487     struct sctphdr *sh, struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2488     struct sctp_nets *net, uint32_t * high_tsn)
2489 {
2490         struct sctp_data_chunk *ch, chunk_buf;
2491         struct sctp_association *asoc;
2492         int num_chunks = 0;     /* number of control chunks processed */
2493         int stop_proc = 0;
2494         int chk_length, break_flag, last_chunk;
2495         int abort_flag = 0, was_a_gap = 0;
2496         struct mbuf *m;
2497
2498         /* set the rwnd */
2499         sctp_set_rwnd(stcb, &stcb->asoc);
2500
2501         m = *mm;
2502         SCTP_TCB_LOCK_ASSERT(stcb);
2503         asoc = &stcb->asoc;
2504         if (compare_with_wrap(stcb->asoc.highest_tsn_inside_map,
2505             stcb->asoc.cumulative_tsn, MAX_TSN)) {
2506                 /* there was a gap before this data was processed */
2507                 was_a_gap = 1;
2508         }
2509         /*
2510          * setup where we got the last DATA packet from for any SACK that
2511          * may need to go out. Don't bump the net. This is done ONLY when a
2512          * chunk is assigned.
2513          */
2514         asoc->last_data_chunk_from = net;
2515
2516         /*-
2517          * Now before we proceed we must figure out if this is a wasted
2518          * cluster... i.e. it is a small packet sent in and yet the driver
2519          * underneath allocated a full cluster for it. If so we must copy it
2520          * to a smaller mbuf and free up the cluster mbuf. This will help
2521          * with cluster starvation. Note for __Panda__ we don't do this
2522          * since it has clusters all the way down to 64 bytes.
2523          */
2524         if (SCTP_BUF_LEN(m) < (long)MLEN && SCTP_BUF_NEXT(m) == NULL) {
2525                 /* we only handle mbufs that are singletons.. not chains */
2526                 m = sctp_get_mbuf_for_msg(SCTP_BUF_LEN(m), 0, M_DONTWAIT, 1, MT_DATA);
2527                 if (m) {
2528                         /* ok lets see if we can copy the data up */
2529                         caddr_t *from, *to;
2530
2531                         /* get the pointers and copy */
2532                         to = mtod(m, caddr_t *);
2533                         from = mtod((*mm), caddr_t *);
2534                         memcpy(to, from, SCTP_BUF_LEN((*mm)));
2535                         /* copy the length and free up the old */
2536                         SCTP_BUF_LEN(m) = SCTP_BUF_LEN((*mm));
2537                         sctp_m_freem(*mm);
2538                         /* sucess, back copy */
2539                         *mm = m;
2540                 } else {
2541                         /* We are in trouble in the mbuf world .. yikes */
2542                         m = *mm;
2543                 }
2544         }
2545         /* get pointer to the first chunk header */
2546         ch = (struct sctp_data_chunk *)sctp_m_getptr(m, *offset,
2547             sizeof(struct sctp_data_chunk), (uint8_t *) & chunk_buf);
2548         if (ch == NULL) {
2549                 return (1);
2550         }
2551         /*
2552          * process all DATA chunks...
2553          */
2554         *high_tsn = asoc->cumulative_tsn;
2555         break_flag = 0;
2556         asoc->data_pkts_seen++;
2557         while (stop_proc == 0) {
2558                 /* validate chunk length */
2559                 chk_length = ntohs(ch->ch.chunk_length);
2560                 if (length - *offset < chk_length) {
2561                         /* all done, mutulated chunk */
2562                         stop_proc = 1;
2563                         break;
2564                 }
2565                 if (ch->ch.chunk_type == SCTP_DATA) {
2566                         if ((size_t)chk_length < sizeof(struct sctp_data_chunk) + 1) {
2567                                 /*
2568                                  * Need to send an abort since we had a
2569                                  * invalid data chunk.
2570                                  */
2571                                 struct mbuf *op_err;
2572
2573                                 op_err = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 2 * sizeof(uint32_t)),
2574                                     0, M_DONTWAIT, 1, MT_DATA);
2575
2576                                 if (op_err) {
2577                                         struct sctp_paramhdr *ph;
2578                                         uint32_t *ippp;
2579
2580                                         SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr) +
2581                                             (2 * sizeof(uint32_t));
2582                                         ph = mtod(op_err, struct sctp_paramhdr *);
2583                                         ph->param_type =
2584                                             htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
2585                                         ph->param_length = htons(SCTP_BUF_LEN(op_err));
2586                                         ippp = (uint32_t *) (ph + 1);
2587                                         *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_19);
2588                                         ippp++;
2589                                         *ippp = asoc->cumulative_tsn;
2590
2591                                 }
2592                                 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_19;
2593                                 sctp_abort_association(inp, stcb, m, iphlen, sh,
2594                                     op_err, 0);
2595                                 return (2);
2596                         }
2597 #ifdef SCTP_AUDITING_ENABLED
2598                         sctp_audit_log(0xB1, 0);
2599 #endif
2600                         if (SCTP_SIZE32(chk_length) == (length - *offset)) {
2601                                 last_chunk = 1;
2602                         } else {
2603                                 last_chunk = 0;
2604                         }
2605                         if (sctp_process_a_data_chunk(stcb, asoc, mm, *offset, ch,
2606                             chk_length, net, high_tsn, &abort_flag, &break_flag,
2607                             last_chunk)) {
2608                                 num_chunks++;
2609                         }
2610                         if (abort_flag)
2611                                 return (2);
2612
2613                         if (break_flag) {
2614                                 /*
2615                                  * Set because of out of rwnd space and no
2616                                  * drop rep space left.
2617                                  */
2618                                 stop_proc = 1;
2619                                 break;
2620                         }
2621                 } else {
2622                         /* not a data chunk in the data region */
2623                         switch (ch->ch.chunk_type) {
2624                         case SCTP_INITIATION:
2625                         case SCTP_INITIATION_ACK:
2626                         case SCTP_SELECTIVE_ACK:
2627                         case SCTP_HEARTBEAT_REQUEST:
2628                         case SCTP_HEARTBEAT_ACK:
2629                         case SCTP_ABORT_ASSOCIATION:
2630                         case SCTP_SHUTDOWN:
2631                         case SCTP_SHUTDOWN_ACK:
2632                         case SCTP_OPERATION_ERROR:
2633                         case SCTP_COOKIE_ECHO:
2634                         case SCTP_COOKIE_ACK:
2635                         case SCTP_ECN_ECHO:
2636                         case SCTP_ECN_CWR:
2637                         case SCTP_SHUTDOWN_COMPLETE:
2638                         case SCTP_AUTHENTICATION:
2639                         case SCTP_ASCONF_ACK:
2640                         case SCTP_PACKET_DROPPED:
2641                         case SCTP_STREAM_RESET:
2642                         case SCTP_FORWARD_CUM_TSN:
2643                         case SCTP_ASCONF:
2644                                 /*
2645                                  * Now, what do we do with KNOWN chunks that
2646                                  * are NOT in the right place?
2647                                  *
2648                                  * For now, I do nothing but ignore them. We
2649                                  * may later want to add sysctl stuff to
2650                                  * switch out and do either an ABORT() or
2651                                  * possibly process them.
2652                                  */
2653                                 if (sctp_strict_data_order) {
2654                                         struct mbuf *op_err;
2655
2656                                         op_err = sctp_generate_invmanparam(SCTP_CAUSE_PROTOCOL_VIOLATION);
2657                                         sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 0);
2658                                         return (2);
2659                                 }
2660                                 break;
2661                         default:
2662                                 /* unknown chunk type, use bit rules */
2663                                 if (ch->ch.chunk_type & 0x40) {
2664                                         /* Add a error report to the queue */
2665                                         struct mbuf *merr;
2666                                         struct sctp_paramhdr *phd;
2667
2668                                         merr = sctp_get_mbuf_for_msg(sizeof(*phd), 0, M_DONTWAIT, 1, MT_DATA);
2669                                         if (merr) {
2670                                                 phd = mtod(merr, struct sctp_paramhdr *);
2671                                                 /*
2672                                                  * We cheat and use param
2673                                                  * type since we did not
2674                                                  * bother to define a error
2675                                                  * cause struct. They are
2676                                                  * the same basic format
2677                                                  * with different names.
2678                                                  */
2679                                                 phd->param_type =
2680                                                     htons(SCTP_CAUSE_UNRECOG_CHUNK);
2681                                                 phd->param_length =
2682                                                     htons(chk_length + sizeof(*phd));
2683                                                 SCTP_BUF_LEN(merr) = sizeof(*phd);
2684                                                 SCTP_BUF_NEXT(merr) = SCTP_M_COPYM(m, *offset,
2685                                                     SCTP_SIZE32(chk_length),
2686                                                     M_DONTWAIT);
2687                                                 if (SCTP_BUF_NEXT(merr)) {
2688                                                         sctp_queue_op_err(stcb, merr);
2689                                                 } else {
2690                                                         sctp_m_freem(merr);
2691                                                 }
2692                                         }
2693                                 }
2694                                 if ((ch->ch.chunk_type & 0x80) == 0) {
2695                                         /* discard the rest of this packet */
2696                                         stop_proc = 1;
2697                                 }       /* else skip this bad chunk and
2698                                          * continue... */
2699                                 break;
2700                         };      /* switch of chunk type */
2701                 }
2702                 *offset += SCTP_SIZE32(chk_length);
2703                 if ((*offset >= length) || stop_proc) {
2704                         /* no more data left in the mbuf chain */
2705                         stop_proc = 1;
2706                         continue;
2707                 }
2708                 ch = (struct sctp_data_chunk *)sctp_m_getptr(m, *offset,
2709                     sizeof(struct sctp_data_chunk), (uint8_t *) & chunk_buf);
2710                 if (ch == NULL) {
2711                         *offset = length;
2712                         stop_proc = 1;
2713                         break;
2714
2715                 }
2716         }                       /* while */
2717         if (break_flag) {
2718                 /*
2719                  * we need to report rwnd overrun drops.
2720                  */
2721                 sctp_send_packet_dropped(stcb, net, *mm, iphlen, 0);
2722         }
2723         if (num_chunks) {
2724                 /*
2725                  * Did we get data, if so update the time for auto-close and
2726                  * give peer credit for being alive.
2727                  */
2728                 SCTP_STAT_INCR(sctps_recvpktwithdata);
2729                 stcb->asoc.overall_error_count = 0;
2730                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_last_rcvd);
2731         }
2732         /* now service all of the reassm queue if needed */
2733         if (!(TAILQ_EMPTY(&asoc->reasmqueue)))
2734                 sctp_service_queues(stcb, asoc);
2735
2736         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
2737                 /* Assure that we ack right away */
2738                 stcb->asoc.send_sack = 1;
2739         }
2740         /* Start a sack timer or QUEUE a SACK for sending */
2741         if ((stcb->asoc.cumulative_tsn == stcb->asoc.highest_tsn_inside_map) &&
2742             (stcb->asoc.mapping_array[0] != 0xff)) {
2743                 if ((stcb->asoc.data_pkts_seen >= stcb->asoc.sack_freq) ||
2744                     (stcb->asoc.delayed_ack == 0) ||
2745                     (stcb->asoc.send_sack == 1)) {
2746                         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
2747                                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
2748                         }
2749                         sctp_send_sack(stcb);
2750                 } else {
2751                         if (!SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
2752                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
2753                                     stcb->sctp_ep, stcb, NULL);
2754                         }
2755                 }
2756         } else {
2757                 sctp_sack_check(stcb, 1, was_a_gap, &abort_flag);
2758         }
2759         if (abort_flag)
2760                 return (2);
2761
2762         return (0);
2763 }
2764
2765 static void
2766 sctp_handle_segments(struct mbuf *m, int *offset, struct sctp_tcb *stcb, struct sctp_association *asoc,
2767     struct sctp_sack_chunk *ch, uint32_t last_tsn, uint32_t * biggest_tsn_acked,
2768     uint32_t * biggest_newly_acked_tsn, uint32_t * this_sack_lowest_newack,
2769     int num_seg, int *ecn_seg_sums)
2770 {
2771         /************************************************/
2772         /* process fragments and update sendqueue        */
2773         /************************************************/
2774         struct sctp_sack *sack;
2775         struct sctp_gap_ack_block *frag, block;
2776         struct sctp_tmit_chunk *tp1;
2777         int i;
2778         unsigned int j;
2779         int num_frs = 0;
2780
2781         uint16_t frag_strt, frag_end, primary_flag_set;
2782         u_long last_frag_high;
2783
2784         /*
2785          * @@@ JRI : TODO: This flag is not used anywhere .. remove?
2786          */
2787         if (asoc->primary_destination->dest_state & SCTP_ADDR_SWITCH_PRIMARY) {
2788                 primary_flag_set = 1;
2789         } else {
2790                 primary_flag_set = 0;
2791         }
2792         sack = &ch->sack;
2793
2794         frag = (struct sctp_gap_ack_block *)sctp_m_getptr(m, *offset,
2795             sizeof(struct sctp_gap_ack_block), (uint8_t *) & block);
2796         *offset += sizeof(block);
2797         if (frag == NULL) {
2798                 return;
2799         }
2800         tp1 = NULL;
2801         last_frag_high = 0;
2802         for (i = 0; i < num_seg; i++) {
2803                 frag_strt = ntohs(frag->start);
2804                 frag_end = ntohs(frag->end);
2805                 /* some sanity checks on the fargment offsets */
2806                 if (frag_strt > frag_end) {
2807                         /* this one is malformed, skip */
2808                         frag++;
2809                         continue;
2810                 }
2811                 if (compare_with_wrap((frag_end + last_tsn), *biggest_tsn_acked,
2812                     MAX_TSN))
2813                         *biggest_tsn_acked = frag_end + last_tsn;
2814
2815                 /* mark acked dgs and find out the highestTSN being acked */
2816                 if (tp1 == NULL) {
2817                         tp1 = TAILQ_FIRST(&asoc->sent_queue);
2818
2819                         /* save the locations of the last frags */
2820                         last_frag_high = frag_end + last_tsn;
2821                 } else {
2822                         /*
2823                          * now lets see if we need to reset the queue due to
2824                          * a out-of-order SACK fragment
2825                          */
2826                         if (compare_with_wrap(frag_strt + last_tsn,
2827                             last_frag_high, MAX_TSN)) {
2828                                 /*
2829                                  * if the new frag starts after the last TSN
2830                                  * frag covered, we are ok and this one is
2831                                  * beyond the last one
2832                                  */
2833                                 ;
2834                         } else {
2835                                 /*
2836                                  * ok, they have reset us, so we need to
2837                                  * reset the queue this will cause extra
2838                                  * hunting but hey, they chose the
2839                                  * performance hit when they failed to order
2840                                  * there gaps..
2841                                  */
2842                                 tp1 = TAILQ_FIRST(&asoc->sent_queue);
2843                         }
2844                         last_frag_high = frag_end + last_tsn;
2845                 }
2846                 for (j = frag_strt + last_tsn; j <= frag_end + last_tsn; j++) {
2847                         while (tp1) {
2848                                 if (tp1->rec.data.doing_fast_retransmit)
2849                                         num_frs++;
2850
2851                                 /*
2852                                  * CMT: CUCv2 algorithm. For each TSN being
2853                                  * processed from the sent queue, track the
2854                                  * next expected pseudo-cumack, or
2855                                  * rtx_pseudo_cumack, if required. Separate
2856                                  * cumack trackers for first transmissions,
2857                                  * and retransmissions.
2858                                  */
2859                                 if ((tp1->whoTo->find_pseudo_cumack == 1) && (tp1->sent < SCTP_DATAGRAM_RESEND) &&
2860                                     (tp1->snd_count == 1)) {
2861                                         tp1->whoTo->pseudo_cumack = tp1->rec.data.TSN_seq;
2862                                         tp1->whoTo->find_pseudo_cumack = 0;
2863                                 }
2864                                 if ((tp1->whoTo->find_rtx_pseudo_cumack == 1) && (tp1->sent < SCTP_DATAGRAM_RESEND) &&
2865                                     (tp1->snd_count > 1)) {
2866                                         tp1->whoTo->rtx_pseudo_cumack = tp1->rec.data.TSN_seq;
2867                                         tp1->whoTo->find_rtx_pseudo_cumack = 0;
2868                                 }
2869                                 if (tp1->rec.data.TSN_seq == j) {
2870                                         if (tp1->sent != SCTP_DATAGRAM_UNSENT) {
2871                                                 /*
2872                                                  * must be held until
2873                                                  * cum-ack passes
2874                                                  */
2875                                                 /*
2876                                                  * ECN Nonce: Add the nonce
2877                                                  * value to the sender's
2878                                                  * nonce sum
2879                                                  */
2880                                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
2881                                                         /*-
2882                                                          * If it is less than RESEND, it is
2883                                                          * now no-longer in flight.
2884                                                          * Higher values may already be set
2885                                                          * via previous Gap Ack Blocks...
2886                                                          * i.e. ACKED or RESEND.
2887                                                          */
2888                                                         if (compare_with_wrap(tp1->rec.data.TSN_seq,
2889                                                             *biggest_newly_acked_tsn, MAX_TSN)) {
2890                                                                 *biggest_newly_acked_tsn = tp1->rec.data.TSN_seq;
2891                                                         }
2892                                                         /*
2893                                                          * CMT: SFR algo
2894                                                          * (and HTNA) - set
2895                                                          * saw_newack to 1
2896                                                          * for dest being
2897                                                          * newly acked.
2898                                                          * update
2899                                                          * this_sack_highest_
2900                                                          * newack if
2901                                                          * appropriate.
2902                                                          */
2903                                                         if (tp1->rec.data.chunk_was_revoked == 0)
2904                                                                 tp1->whoTo->saw_newack = 1;
2905
2906                                                         if (compare_with_wrap(tp1->rec.data.TSN_seq,
2907                                                             tp1->whoTo->this_sack_highest_newack,
2908                                                             MAX_TSN)) {
2909                                                                 tp1->whoTo->this_sack_highest_newack =
2910                                                                     tp1->rec.data.TSN_seq;
2911                                                         }
2912                                                         /*
2913                                                          * CMT DAC algo:
2914                                                          * also update
2915                                                          * this_sack_lowest_n
2916                                                          * ewack
2917                                                          */
2918                                                         if (*this_sack_lowest_newack == 0) {
2919                                                                 if (sctp_logging_level & SCTP_SACK_LOGGING_ENABLE) {
2920                                                                         sctp_log_sack(*this_sack_lowest_newack,
2921                                                                             last_tsn,
2922                                                                             tp1->rec.data.TSN_seq,
2923                                                                             0,
2924                                                                             0,
2925                                                                             SCTP_LOG_TSN_ACKED);
2926                                                                 }
2927                                                                 *this_sack_lowest_newack = tp1->rec.data.TSN_seq;
2928                                                         }
2929                                                         /*
2930                                                          * CMT: CUCv2
2931                                                          * algorithm. If
2932                                                          * (rtx-)pseudo-cumac
2933                                                          * k for corresp
2934                                                          * dest is being
2935                                                          * acked, then we
2936                                                          * have a new
2937                                                          * (rtx-)pseudo-cumac
2938                                                          * k. Set
2939                                                          * new_(rtx_)pseudo_c
2940                                                          * umack to TRUE so
2941                                                          * that the cwnd for
2942                                                          * this dest can be
2943                                                          * updated. Also
2944                                                          * trigger search
2945                                                          * for the next
2946                                                          * expected
2947                                                          * (rtx-)pseudo-cumac
2948                                                          * k. Separate
2949                                                          * pseudo_cumack
2950                                                          * trackers for
2951                                                          * first
2952                                                          * transmissions and
2953                                                          * retransmissions.
2954                                                          */
2955                                                         if (tp1->rec.data.TSN_seq == tp1->whoTo->pseudo_cumack) {
2956                                                                 if (tp1->rec.data.chunk_was_revoked == 0) {
2957                                                                         tp1->whoTo->new_pseudo_cumack = 1;
2958                                                                 }
2959                                                                 tp1->whoTo->find_pseudo_cumack = 1;
2960                                                         }
2961                                                         if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
2962                                                                 sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK);
2963                                                         }
2964                                                         if (tp1->rec.data.TSN_seq == tp1->whoTo->rtx_pseudo_cumack) {
2965                                                                 if (tp1->rec.data.chunk_was_revoked == 0) {
2966                                                                         tp1->whoTo->new_pseudo_cumack = 1;
2967                                                                 }
2968                                                                 tp1->whoTo->find_rtx_pseudo_cumack = 1;
2969                                                         }
2970                                                         if (sctp_logging_level & SCTP_SACK_LOGGING_ENABLE) {
2971                                                                 sctp_log_sack(*biggest_newly_acked_tsn,
2972                                                                     last_tsn,
2973                                                                     tp1->rec.data.TSN_seq,
2974                                                                     frag_strt,
2975                                                                     frag_end,
2976                                                                     SCTP_LOG_TSN_ACKED);
2977                                                         }
2978                                                         if (sctp_logging_level & SCTP_FLIGHT_LOGGING_ENABLE) {
2979                                                                 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_GAP,
2980                                                                     tp1->whoTo->flight_size,
2981                                                                     tp1->book_size,
2982                                                                     (uintptr_t) tp1->whoTo,
2983                                                                     tp1->rec.data.TSN_seq);
2984                                                         }
2985                                                         sctp_flight_size_decrease(tp1);
2986                                                         sctp_total_flight_decrease(stcb, tp1);
2987
2988                                                         tp1->whoTo->net_ack += tp1->send_size;
2989                                                         if (tp1->snd_count < 2) {
2990                                                                 /*
2991                                                                  * True
2992                                                                  * non-retran
2993                                                                  * smited
2994                                                                  * chunk */
2995                                                                 tp1->whoTo->net_ack2 += tp1->send_size;
2996
2997                                                                 /*
2998                                                                  * update RTO
2999                                                                  * too ? */
3000                                                                 if (tp1->do_rtt) {
3001                                                                         tp1->whoTo->RTO =
3002                                                                             sctp_calculate_rto(stcb,
3003                                                                             asoc,
3004                                                                             tp1->whoTo,
3005                                                                             &tp1->sent_rcv_time,
3006                                                                             sctp_align_safe_nocopy);
3007                                                                         tp1->do_rtt = 0;
3008                                                                 }
3009                                                         }
3010                                                 }
3011                                                 if (tp1->sent <= SCTP_DATAGRAM_RESEND) {
3012                                                         (*ecn_seg_sums) += tp1->rec.data.ect_nonce;
3013                                                         (*ecn_seg_sums) &= SCTP_SACK_NONCE_SUM;
3014                                                         if (compare_with_wrap(tp1->rec.data.TSN_seq,
3015                                                             asoc->this_sack_highest_gap,
3016                                                             MAX_TSN)) {
3017                                                                 asoc->this_sack_highest_gap =
3018                                                                     tp1->rec.data.TSN_seq;
3019                                                         }
3020                                                         if (tp1->sent == SCTP_DATAGRAM_RESEND) {
3021                                                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
3022 #ifdef SCTP_AUDITING_ENABLED
3023                                                                 sctp_audit_log(0xB2,
3024                                                                     (asoc->sent_queue_retran_cnt & 0x000000ff));
3025 #endif
3026                                                         }
3027                                                 }
3028                                                 /*
3029                                                  * All chunks NOT UNSENT
3030                                                  * fall through here and are
3031                                                  * marked
3032                                                  */
3033                                                 tp1->sent = SCTP_DATAGRAM_MARKED;
3034                                                 if (tp1->rec.data.chunk_was_revoked) {
3035                                                         /* deflate the cwnd */
3036                                                         tp1->whoTo->cwnd -= tp1->book_size;
3037                                                         tp1->rec.data.chunk_was_revoked = 0;
3038                                                 }
3039                                         }
3040                                         break;
3041                                 }       /* if (tp1->TSN_seq == j) */
3042                                 if (compare_with_wrap(tp1->rec.data.TSN_seq, j,
3043                                     MAX_TSN))
3044                                         break;
3045
3046                                 tp1 = TAILQ_NEXT(tp1, sctp_next);
3047                         }       /* end while (tp1) */
3048                 }               /* end for (j = fragStart */
3049                 frag = (struct sctp_gap_ack_block *)sctp_m_getptr(m, *offset,
3050                     sizeof(struct sctp_gap_ack_block), (uint8_t *) & block);
3051                 *offset += sizeof(block);
3052                 if (frag == NULL) {
3053                         break;
3054                 }
3055         }
3056         if (sctp_logging_level & SCTP_FR_LOGGING_ENABLE) {
3057                 if (num_frs)
3058                         sctp_log_fr(*biggest_tsn_acked,
3059                             *biggest_newly_acked_tsn,
3060                             last_tsn, SCTP_FR_LOG_BIGGEST_TSNS);
3061         }
3062 }
3063
3064 static void
3065 sctp_check_for_revoked(struct sctp_tcb *stcb,
3066     struct sctp_association *asoc, uint32_t cumack,
3067     u_long biggest_tsn_acked)
3068 {
3069         struct sctp_tmit_chunk *tp1;
3070         int tot_revoked = 0;
3071
3072         tp1 = TAILQ_FIRST(&asoc->sent_queue);
3073         while (tp1) {
3074                 if (compare_with_wrap(tp1->rec.data.TSN_seq, cumack,
3075                     MAX_TSN)) {
3076                         /*
3077                          * ok this guy is either ACK or MARKED. If it is
3078                          * ACKED it has been previously acked but not this
3079                          * time i.e. revoked.  If it is MARKED it was ACK'ed
3080                          * again.
3081                          */
3082                         if (compare_with_wrap(tp1->rec.data.TSN_seq, biggest_tsn_acked,
3083                             MAX_TSN))
3084                                 break;
3085
3086
3087                         if (tp1->sent == SCTP_DATAGRAM_ACKED) {
3088                                 /* it has been revoked */
3089                                 tp1->sent = SCTP_DATAGRAM_SENT;
3090                                 tp1->rec.data.chunk_was_revoked = 1;
3091                                 /*
3092                                  * We must add this stuff back in to assure
3093                                  * timers and such get started.
3094                                  */
3095                                 if (sctp_logging_level & SCTP_FLIGHT_LOGGING_ENABLE) {
3096                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_REVOKE,
3097                                             tp1->whoTo->flight_size,
3098                                             tp1->book_size,
3099                                             (uintptr_t) tp1->whoTo,
3100                                             tp1->rec.data.TSN_seq);
3101                                 }
3102                                 sctp_flight_size_increase(tp1);
3103                                 sctp_total_flight_increase(stcb, tp1);
3104                                 /*
3105                                  * We inflate the cwnd to compensate for our
3106                                  * artificial inflation of the flight_size.
3107                                  */
3108                                 tp1->whoTo->cwnd += tp1->book_size;
3109                                 tot_revoked++;
3110                                 if (sctp_logging_level & SCTP_SACK_LOGGING_ENABLE) {
3111                                         sctp_log_sack(asoc->last_acked_seq,
3112                                             cumack,
3113                                             tp1->rec.data.TSN_seq,
3114                                             0,
3115                                             0,
3116                                             SCTP_LOG_TSN_REVOKED);
3117                                 }
3118                         } else if (tp1->sent == SCTP_DATAGRAM_MARKED) {
3119                                 /* it has been re-acked in this SACK */
3120                                 tp1->sent = SCTP_DATAGRAM_ACKED;
3121                         }
3122                 }
3123                 if (tp1->sent == SCTP_DATAGRAM_UNSENT)
3124                         break;
3125                 tp1 = TAILQ_NEXT(tp1, sctp_next);
3126         }
3127         if (tot_revoked > 0) {
3128                 /*
3129                  * Setup the ecn nonce re-sync point. We do this since once
3130                  * data is revoked we begin to retransmit things, which do
3131                  * NOT have the ECN bits set. This means we are now out of
3132                  * sync and must wait until we get back in sync with the
3133                  * peer to check ECN bits.
3134                  */
3135                 tp1 = TAILQ_FIRST(&asoc->send_queue);
3136                 if (tp1 == NULL) {
3137                         asoc->nonce_resync_tsn = asoc->sending_seq;
3138                 } else {
3139                         asoc->nonce_resync_tsn = tp1->rec.data.TSN_seq;
3140                 }
3141                 asoc->nonce_wait_for_ecne = 0;
3142                 asoc->nonce_sum_check = 0;
3143         }
3144 }
3145
3146 static void
3147 sctp_strike_gap_ack_chunks(struct sctp_tcb *stcb, struct sctp_association *asoc,
3148     u_long biggest_tsn_acked, u_long biggest_tsn_newly_acked, u_long this_sack_lowest_newack, int accum_moved)
3149 {
3150         struct sctp_tmit_chunk *tp1;
3151         int strike_flag = 0;
3152         struct timeval now;
3153         int tot_retrans = 0;
3154         uint32_t sending_seq;
3155         struct sctp_nets *net;
3156         int num_dests_sacked = 0;
3157
3158         /*
3159          * select the sending_seq, this is either the next thing ready to be
3160          * sent but not transmitted, OR, the next seq we assign.
3161          */
3162         tp1 = TAILQ_FIRST(&stcb->asoc.send_queue);
3163         if (tp1 == NULL) {
3164                 sending_seq = asoc->sending_seq;
3165         } else {
3166                 sending_seq = tp1->rec.data.TSN_seq;
3167         }
3168
3169         /* CMT DAC algo: finding out if SACK is a mixed SACK */
3170         if (sctp_cmt_on_off && sctp_cmt_use_dac) {
3171                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
3172                         if (net->saw_newack)
3173                                 num_dests_sacked++;
3174                 }
3175         }
3176         if (stcb->asoc.peer_supports_prsctp) {
3177                 (void)SCTP_GETTIME_TIMEVAL(&now);
3178         }
3179         tp1 = TAILQ_FIRST(&asoc->sent_queue);
3180         while (tp1) {
3181                 strike_flag = 0;
3182                 if (tp1->no_fr_allowed) {
3183                         /* this one had a timeout or something */
3184                         tp1 = TAILQ_NEXT(tp1, sctp_next);
3185                         continue;
3186                 }
3187                 if (sctp_logging_level & SCTP_FR_LOGGING_ENABLE) {
3188                         if (tp1->sent < SCTP_DATAGRAM_RESEND)
3189                                 sctp_log_fr(biggest_tsn_newly_acked,
3190                                     tp1->rec.data.TSN_seq,
3191                                     tp1->sent,
3192                                     SCTP_FR_LOG_CHECK_STRIKE);
3193                 }
3194                 if (compare_with_wrap(tp1->rec.data.TSN_seq, biggest_tsn_acked,
3195                     MAX_TSN) ||
3196                     tp1->sent == SCTP_DATAGRAM_UNSENT) {
3197                         /* done */
3198                         break;
3199                 }
3200                 if (stcb->asoc.peer_supports_prsctp) {
3201                         if ((PR_SCTP_TTL_ENABLED(tp1->flags)) && tp1->sent < SCTP_DATAGRAM_ACKED) {
3202                                 /* Is it expired? */
3203                                 if (
3204                                     (timevalcmp(&now, &tp1->rec.data.timetodrop, >))
3205                                     ) {
3206                                         /* Yes so drop it */
3207                                         if (tp1->data != NULL) {
3208                                                 (void)sctp_release_pr_sctp_chunk(stcb, tp1,
3209                                                     (SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT),
3210                                                     &asoc->sent_queue);
3211                                         }
3212                                         tp1 = TAILQ_NEXT(tp1, sctp_next);
3213                                         continue;
3214                                 }
3215                         }
3216                         if ((PR_SCTP_RTX_ENABLED(tp1->flags)) && tp1->sent < SCTP_DATAGRAM_ACKED) {
3217                                 /* Has it been retransmitted tv_sec times? */
3218                                 if (tp1->snd_count > tp1->rec.data.timetodrop.tv_sec) {
3219                                         /* Yes, so drop it */
3220                                         if (tp1->data != NULL) {
3221                                                 (void)sctp_release_pr_sctp_chunk(stcb, tp1,
3222                                                     (SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT),
3223                                                     &asoc->sent_queue);
3224                                         }
3225                                         tp1 = TAILQ_NEXT(tp1, sctp_next);
3226                                         continue;
3227                                 }
3228                         }
3229                 }
3230                 if (compare_with_wrap(tp1->rec.data.TSN_seq,
3231                     asoc->this_sack_highest_gap, MAX_TSN)) {
3232                         /* we are beyond the tsn in the sack  */
3233                         break;
3234                 }
3235                 if (tp1->sent >= SCTP_DATAGRAM_RESEND) {
3236                         /* either a RESEND, ACKED, or MARKED */
3237                         /* skip */
3238                         tp1 = TAILQ_NEXT(tp1, sctp_next);
3239                         continue;
3240                 }
3241                 /*
3242                  * CMT : SFR algo (covers part of DAC and HTNA as well)
3243                  */
3244                 if (tp1->whoTo && tp1->whoTo->saw_newack == 0) {
3245                         /*
3246                          * No new acks were receieved for data sent to this
3247                          * dest. Therefore, according to the SFR algo for
3248                          * CMT, no data sent to this dest can be marked for
3249                          * FR using this SACK.
3250                          */
3251                         tp1 = TAILQ_NEXT(tp1, sctp_next);
3252                         continue;
3253                 } else if (tp1->whoTo && compare_with_wrap(tp1->rec.data.TSN_seq,
3254                     tp1->whoTo->this_sack_highest_newack, MAX_TSN)) {
3255                         /*
3256                          * CMT: New acks were receieved for data sent to
3257                          * this dest. But no new acks were seen for data
3258                          * sent after tp1. Therefore, according to the SFR
3259                          * algo for CMT, tp1 cannot be marked for FR using
3260                          * this SACK. This step covers part of the DAC algo
3261                          * and the HTNA algo as well.
3262                          */
3263                         tp1 = TAILQ_NEXT(tp1, sctp_next);
3264                         continue;
3265                 }
3266                 /*
3267                  * Here we check to see if we were have already done a FR
3268                  * and if so we see if the biggest TSN we saw in the sack is
3269                  * smaller than the recovery point. If so we don't strike
3270                  * the tsn... otherwise we CAN strike the TSN.
3271                  */
3272                 /*
3273                  * @@@ JRI: Check for CMT if (accum_moved &&
3274                  * asoc->fast_retran_loss_recovery && (sctp_cmt_on_off ==
3275                  * 0)) {
3276                  */
3277                 if (accum_moved && asoc->fast_retran_loss_recovery) {
3278                         /*
3279                          * Strike the TSN if in fast-recovery and cum-ack
3280                          * moved.
3281                          */
3282                         if (sctp_logging_level & SCTP_FR_LOGGING_ENABLE) {
3283                                 sctp_log_fr(biggest_tsn_newly_acked,
3284                                     tp1->rec.data.TSN_seq,
3285                                     tp1->sent,
3286                                     SCTP_FR_LOG_STRIKE_CHUNK);
3287                         }
3288                         if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3289                                 tp1->sent++;
3290                         }
3291                         if (sctp_cmt_on_off && sctp_cmt_use_dac) {
3292                                 /*
3293                                  * CMT DAC algorithm: If SACK flag is set to
3294                                  * 0, then lowest_newack test will not pass
3295                                  * because it would have been set to the
3296                                  * cumack earlier. If not already to be
3297                                  * rtx'd, If not a mixed sack and if tp1 is
3298                                  * not between two sacked TSNs, then mark by
3299                                  * one more. NOTE that we are marking by one
3300                                  * additional time since the SACK DAC flag
3301                                  * indicates that two packets have been
3302                                  * received after this missing TSN.
3303                                  */
3304                                 if ((tp1->sent < SCTP_DATAGRAM_RESEND) && (num_dests_sacked == 1) &&
3305                                     compare_with_wrap(this_sack_lowest_newack, tp1->rec.data.TSN_seq, MAX_TSN)) {
3306                                         if (sctp_logging_level & SCTP_FR_LOGGING_ENABLE) {
3307                                                 sctp_log_fr(16 + num_dests_sacked,
3308                                                     tp1->rec.data.TSN_seq,
3309                                                     tp1->sent,
3310                                                     SCTP_FR_LOG_STRIKE_CHUNK);
3311                                         }
3312                                         tp1->sent++;
3313                                 }
3314                         }
3315                 } else if (tp1->rec.data.doing_fast_retransmit) {
3316                         /*
3317                          * For those that have done a FR we must take
3318                          * special consideration if we strike. I.e the
3319                          * biggest_newly_acked must be higher than the
3320                          * sending_seq at the time we did the FR.
3321                          */
3322                         if (
3323 #ifdef SCTP_FR_TO_ALTERNATE
3324                         /*
3325                          * If FR's go to new networks, then we must only do
3326                          * this for singly homed asoc's. However if the FR's
3327                          * go to the same network (Armando's work) then its
3328                          * ok to FR multiple times.
3329                          */
3330                             (asoc->numnets < 2)
3331 #else
3332                             (1)
3333 #endif
3334                             ) {
3335
3336                                 if ((compare_with_wrap(biggest_tsn_newly_acked,
3337                                     tp1->rec.data.fast_retran_tsn, MAX_TSN)) ||
3338                                     (biggest_tsn_newly_acked ==
3339                                     tp1->rec.data.fast_retran_tsn)) {
3340                                         /*
3341                                          * Strike the TSN, since this ack is
3342                                          * beyond where things were when we
3343                                          * did a FR.
3344                                          */
3345                                         if (sctp_logging_level & SCTP_FR_LOGGING_ENABLE) {
3346                                                 sctp_log_fr(biggest_tsn_newly_acked,
3347                                                     tp1->rec.data.TSN_seq,
3348                                                     tp1->sent,
3349                                                     SCTP_FR_LOG_STRIKE_CHUNK);
3350                                         }
3351                                         if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3352                                                 tp1->sent++;
3353                                         }
3354                                         strike_flag = 1;
3355                                         if (sctp_cmt_on_off && sctp_cmt_use_dac) {
3356                                                 /*
3357                                                  * CMT DAC algorithm: If
3358                                                  * SACK flag is set to 0,
3359                                                  * then lowest_newack test
3360                                                  * will not pass because it
3361                                                  * would have been set to
3362                                                  * the cumack earlier. If
3363                                                  * not already to be rtx'd,
3364                                                  * If not a mixed sack and
3365                                                  * if tp1 is not between two
3366                                                  * sacked TSNs, then mark by
3367                                                  * one more. NOTE that we
3368                                                  * are marking by one
3369                                                  * additional time since the
3370                                                  * SACK DAC flag indicates
3371                                                  * that two packets have
3372                                                  * been received after this
3373                                                  * missing TSN.
3374                                                  */
3375                                                 if ((tp1->sent < SCTP_DATAGRAM_RESEND) &&
3376                                                     (num_dests_sacked == 1) &&
3377                                                     compare_with_wrap(this_sack_lowest_newack,
3378                                                     tp1->rec.data.TSN_seq, MAX_TSN)) {
3379                                                         if (sctp_logging_level & SCTP_FR_LOGGING_ENABLE) {
3380                                                                 sctp_log_fr(32 + num_dests_sacked,
3381                                                                     tp1->rec.data.TSN_seq,
3382                                                                     tp1->sent,
3383                                                                     SCTP_FR_LOG_STRIKE_CHUNK);
3384                                                         }
3385                                                         if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3386                                                                 tp1->sent++;
3387
3388                                                         }
3389                                                 }
3390                                         }
3391                                 }
3392                         }
3393                         /*
3394                          * JRI: TODO: remove code for HTNA algo. CMT's SFR
3395                          * algo covers HTNA.
3396                          */
3397                 } else if (compare_with_wrap(tp1->rec.data.TSN_seq,
3398                     biggest_tsn_newly_acked, MAX_TSN)) {
3399                         /*
3400                          * We don't strike these: This is the  HTNA
3401                          * algorithm i.e. we don't strike If our TSN is
3402                          * larger than the Highest TSN Newly Acked.
3403                          */
3404                         ;
3405                 } else {
3406                         /* Strike the TSN */
3407                         if (sctp_logging_level & SCTP_FR_LOGGING_ENABLE) {
3408                                 sctp_log_fr(biggest_tsn_newly_acked,
3409                                     tp1->rec.data.TSN_seq,
3410                                     tp1->sent,
3411                                     SCTP_FR_LOG_STRIKE_CHUNK);
3412                         }
3413                         if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3414                                 tp1->sent++;
3415                         }
3416                         if (sctp_cmt_on_off && sctp_cmt_use_dac) {
3417                                 /*
3418                                  * CMT DAC algorithm: If SACK flag is set to
3419                                  * 0, then lowest_newack test will not pass
3420                                  * because it would have been set to the
3421                                  * cumack earlier. If not already to be
3422                                  * rtx'd, If not a mixed sack and if tp1 is
3423                                  * not between two sacked TSNs, then mark by
3424                                  * one more. NOTE that we are marking by one
3425                                  * additional time since the SACK DAC flag
3426                                  * indicates that two packets have been
3427                                  * received after this missing TSN.
3428                                  */
3429                                 if ((tp1->sent < SCTP_DATAGRAM_RESEND) && (num_dests_sacked == 1) &&
3430                                     compare_with_wrap(this_sack_lowest_newack, tp1->rec.data.TSN_seq, MAX_TSN)) {
3431                                         if (sctp_logging_level & SCTP_FR_LOGGING_ENABLE) {
3432                                                 sctp_log_fr(48 + num_dests_sacked,
3433                                                     tp1->rec.data.TSN_seq,
3434                                                     tp1->sent,
3435                                                     SCTP_FR_LOG_STRIKE_CHUNK);
3436                                         }
3437                                         tp1->sent++;
3438                                 }
3439                         }
3440                 }
3441                 if (tp1->sent == SCTP_DATAGRAM_RESEND) {
3442                         /* Increment the count to resend */
3443                         struct sctp_nets *alt;
3444
3445                         /* printf("OK, we are now ready to FR this guy\n"); */
3446                         if (sctp_logging_level & SCTP_FR_LOGGING_ENABLE) {
3447                                 sctp_log_fr(tp1->rec.data.TSN_seq, tp1->snd_count,
3448                                     0, SCTP_FR_MARKED);
3449                         }
3450                         if (strike_flag) {
3451                                 /* This is a subsequent FR */
3452                                 SCTP_STAT_INCR(sctps_sendmultfastretrans);
3453                         }
3454                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3455                         if (sctp_cmt_on_off) {
3456                                 /*
3457                                  * CMT: Using RTX_SSTHRESH policy for CMT.
3458                                  * If CMT is being used, then pick dest with
3459                                  * largest ssthresh for any retransmission.
3460                                  */
3461                                 tp1->no_fr_allowed = 1;
3462                                 alt = tp1->whoTo;
3463                                 /* sa_ignore NO_NULL_CHK */
3464                                 if (sctp_cmt_on_off && sctp_cmt_pf) {
3465                                         /*
3466                                          * JRS 5/18/07 - If CMT PF is on,
3467                                          * use the PF version of
3468                                          * find_alt_net()
3469                                          */
3470                                         alt = sctp_find_alternate_net(stcb, alt, 2);
3471                                 } else {
3472                                         /*
3473                                          * JRS 5/18/07 - If only CMT is on,
3474                                          * use the CMT version of
3475                                          * find_alt_net()
3476                                          */
3477                                         /* sa_ignore NO_NULL_CHK */
3478                                         alt = sctp_find_alternate_net(stcb, alt, 1);
3479                                 }
3480                                 if (alt == NULL) {
3481                                         alt = tp1->whoTo;
3482                                 }
3483                                 /*
3484                                  * CUCv2: If a different dest is picked for
3485                                  * the retransmission, then new
3486                                  * (rtx-)pseudo_cumack needs to be tracked
3487                                  * for orig dest. Let CUCv2 track new (rtx-)
3488                                  * pseudo-cumack always.
3489                                  */
3490                                 if (tp1->whoTo) {
3491                                         tp1->whoTo->find_pseudo_cumack = 1;
3492                                         tp1->whoTo->find_rtx_pseudo_cumack = 1;
3493                                 }
3494                         } else {/* CMT is OFF */
3495
3496 #ifdef SCTP_FR_TO_ALTERNATE
3497                                 /* Can we find an alternate? */
3498                                 alt = sctp_find_alternate_net(stcb, tp1->whoTo, 0);
3499 #else
3500                                 /*
3501                                  * default behavior is to NOT retransmit
3502                                  * FR's to an alternate. Armando Caro's
3503                                  * paper details why.
3504                                  */
3505                                 alt = tp1->whoTo;
3506 #endif
3507                         }
3508
3509                         tp1->rec.data.doing_fast_retransmit = 1;
3510                         tot_retrans++;
3511                         /* mark the sending seq for possible subsequent FR's */
3512                         /*
3513                          * printf("Marking TSN for FR new value %x\n",
3514                          * (uint32_t)tpi->rec.data.TSN_seq);
3515                          */
3516                         if (TAILQ_EMPTY(&asoc->send_queue)) {
3517                                 /*
3518                                  * If the queue of send is empty then its
3519                                  * the next sequence number that will be
3520                                  * assigned so we subtract one from this to
3521                                  * get the one we last sent.
3522                                  */
3523                                 tp1->rec.data.fast_retran_tsn = sending_seq;
3524                         } else {
3525                                 /*
3526                                  * If there are chunks on the send queue
3527                                  * (unsent data that has made it from the
3528                                  * stream queues but not out the door, we
3529                                  * take the first one (which will have the
3530                                  * lowest TSN) and subtract one to get the
3531                                  * one we last sent.
3532                                  */
3533                                 struct sctp_tmit_chunk *ttt;
3534
3535                                 ttt = TAILQ_FIRST(&asoc->send_queue);
3536                                 tp1->rec.data.fast_retran_tsn =
3537                                     ttt->rec.data.TSN_seq;
3538                         }
3539
3540                         if (tp1->do_rtt) {
3541                                 /*
3542                                  * this guy had a RTO calculation pending on
3543                                  * it, cancel it
3544                                  */
3545                                 tp1->do_rtt = 0;
3546                         }
3547                         /* fix counts and things */
3548                         if (sctp_logging_level & SCTP_FLIGHT_LOGGING_ENABLE) {
3549                                 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_RSND,
3550                                     (tp1->whoTo ? (tp1->whoTo->flight_size) : 0),
3551                                     tp1->book_size,
3552                                     (uintptr_t) tp1->whoTo,
3553                                     tp1->rec.data.TSN_seq);
3554                         }
3555                         if (tp1->whoTo) {
3556                                 tp1->whoTo->net_ack++;
3557                                 sctp_flight_size_decrease(tp1);
3558                         }
3559                         if (sctp_logging_level & SCTP_LOG_RWND_ENABLE) {
3560                                 sctp_log_rwnd(SCTP_INCREASE_PEER_RWND,
3561                                     asoc->peers_rwnd, tp1->send_size, sctp_peer_chunk_oh);
3562                         }
3563                         /* add back to the rwnd */
3564                         asoc->peers_rwnd += (tp1->send_size + sctp_peer_chunk_oh);
3565
3566                         /* remove from the total flight */
3567                         sctp_total_flight_decrease(stcb, tp1);
3568                         if (alt != tp1->whoTo) {
3569                                 /* yes, there is an alternate. */
3570                                 sctp_free_remote_addr(tp1->whoTo);
3571                                 /* sa_ignore FREED_MEMORY */
3572                                 tp1->whoTo = alt;
3573                                 atomic_add_int(&alt->ref_count, 1);
3574                         }
3575                 }
3576                 tp1 = TAILQ_NEXT(tp1, sctp_next);
3577         }                       /* while (tp1) */
3578
3579         if (tot_retrans > 0) {
3580                 /*
3581                  * Setup the ecn nonce re-sync point. We do this since once
3582                  * we go to FR something we introduce a Karn's rule scenario
3583                  * and won't know the totals for the ECN bits.
3584                  */
3585                 asoc->nonce_resync_tsn = sending_seq;
3586                 asoc->nonce_wait_for_ecne = 0;
3587                 asoc->nonce_sum_check = 0;
3588         }
3589 }
3590
3591 struct sctp_tmit_chunk *
3592 sctp_try_advance_peer_ack_point(struct sctp_tcb *stcb,
3593     struct sctp_association *asoc)
3594 {
3595         struct sctp_tmit_chunk *tp1, *tp2, *a_adv = NULL;
3596         struct timeval now;
3597         int now_filled = 0;
3598
3599         if (asoc->peer_supports_prsctp == 0) {
3600                 return (NULL);
3601         }
3602         tp1 = TAILQ_FIRST(&asoc->sent_queue);
3603         while (tp1) {
3604                 if (tp1->sent != SCTP_FORWARD_TSN_SKIP &&
3605                     tp1->sent != SCTP_DATAGRAM_RESEND) {
3606                         /* no chance to advance, out of here */
3607                         break;
3608                 }
3609                 if (!PR_SCTP_ENABLED(tp1->flags)) {
3610                         /*
3611                          * We can't fwd-tsn past any that are reliable aka
3612                          * retransmitted until the asoc fails.
3613                          */
3614                         break;
3615                 }
3616                 if (!now_filled) {
3617                         (void)SCTP_GETTIME_TIMEVAL(&now);
3618                         now_filled = 1;
3619                 }
3620                 tp2 = TAILQ_NEXT(tp1, sctp_next);
3621                 /*
3622                  * now we got a chunk which is marked for another
3623                  * retransmission to a PR-stream but has run out its chances
3624                  * already maybe OR has been marked to skip now. Can we skip
3625                  * it if its a resend?
3626                  */
3627                 if (tp1->sent == SCTP_DATAGRAM_RESEND &&
3628                     (PR_SCTP_TTL_ENABLED(tp1->flags))) {
3629                         /*
3630                          * Now is this one marked for resend and its time is
3631                          * now up?
3632                          */
3633                         if (timevalcmp(&now, &tp1->rec.data.timetodrop, >)) {
3634                                 /* Yes so drop it */
3635                                 if (tp1->data) {
3636                                         (void)sctp_release_pr_sctp_chunk(stcb, tp1,
3637                                             (SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT),
3638                                             &asoc->sent_queue);
3639                                 }
3640                         } else {
3641                                 /*
3642                                  * No, we are done when hit one for resend
3643                                  * whos time as not expired.
3644                                  */
3645                                 break;
3646                         }
3647                 }
3648                 /*
3649                  * Ok now if this chunk is marked to drop it we can clean up
3650                  * the chunk, advance our peer ack point and we can check
3651                  * the next chunk.
3652                  */
3653                 if (tp1->sent == SCTP_FORWARD_TSN_SKIP) {
3654                         /* advance PeerAckPoint goes forward */
3655                         asoc->advanced_peer_ack_point = tp1->rec.data.TSN_seq;
3656                         a_adv = tp1;
3657                         /*
3658                          * we don't want to de-queue it here. Just wait for
3659                          * the next peer SACK to come with a new cumTSN and
3660                          * then the chunk will be droped in the normal
3661                          * fashion.
3662                          */
3663                         if (tp1->data) {
3664                                 sctp_free_bufspace(stcb, asoc, tp1, 1);
3665                                 /*
3666                                  * Maybe there should be another
3667                                  * notification type
3668                                  */
3669                                 sctp_ulp_notify(SCTP_NOTIFY_DG_FAIL, stcb,
3670                                     (SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT),
3671                                     tp1);
3672                                 sctp_m_freem(tp1->data);
3673                                 tp1->data = NULL;
3674                                 if (stcb->sctp_socket) {
3675                                         sctp_sowwakeup(stcb->sctp_ep,
3676                                             stcb->sctp_socket);
3677                                         if (sctp_logging_level & SCTP_WAKE_LOGGING_ENABLE) {
3678                                                 sctp_wakeup_log(stcb, tp1->rec.data.TSN_seq, 1, SCTP_WAKESND_FROM_FWDTSN);
3679                                         }
3680                                 }
3681                         }
3682                 } else {
3683                         /*
3684                          * If it is still in RESEND we can advance no
3685                          * further
3686                          */
3687                         break;
3688                 }
3689                 /*
3690                  * If we hit here we just dumped tp1, move to next tsn on
3691                  * sent queue.
3692                  */
3693                 tp1 = tp2;
3694         }
3695         return (a_adv);
3696 }
3697
3698 static void
3699 sctp_fs_audit(struct sctp_association *asoc)
3700 {
3701         struct sctp_tmit_chunk *chk;
3702         int inflight = 0, resend = 0, inbetween = 0, acked = 0, above = 0;
3703
3704         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
3705                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
3706                         inflight++;
3707                 } else if (chk->sent == SCTP_DATAGRAM_RESEND) {
3708                         resend++;
3709                 } else if (chk->sent < SCTP_DATAGRAM_ACKED) {
3710                         inbetween++;
3711                 } else if (chk->sent > SCTP_DATAGRAM_ACKED) {
3712                         above++;
3713                 } else {
3714                         acked++;
3715                 }
3716         }
3717
3718         if ((inflight > 0) || (inbetween > 0)) {
3719 #ifdef INVARIANTS
3720                 panic("Flight size-express incorrect? \n");
3721 #else
3722                 SCTP_PRINTF("Flight size-express incorrect inflight:%d inbetween:%d\n",
3723                     inflight, inbetween);
3724 #endif
3725         }
3726 }
3727
3728
3729 static void
3730 sctp_window_probe_recovery(struct sctp_tcb *stcb,
3731     struct sctp_association *asoc,
3732     struct sctp_nets *net,
3733     struct sctp_tmit_chunk *tp1)
3734 {
3735         struct sctp_tmit_chunk *chk;
3736
3737         /* First setup this one and get it moved back */
3738         tp1->sent = SCTP_DATAGRAM_UNSENT;
3739         if (sctp_logging_level & SCTP_FLIGHT_LOGGING_ENABLE) {
3740                 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_WP,
3741                     tp1->whoTo->flight_size,
3742                     tp1->book_size,
3743                     (uintptr_t) tp1->whoTo,
3744                     tp1->rec.data.TSN_seq);
3745         }
3746         sctp_flight_size_decrease(tp1);
3747         sctp_total_flight_decrease(stcb, tp1);
3748         TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next);
3749         TAILQ_INSERT_HEAD(&asoc->send_queue, tp1, sctp_next);
3750         asoc->sent_queue_cnt--;
3751         asoc->send_queue_cnt++;
3752         /*
3753          * Now all guys marked for RESEND on the sent_queue must be moved
3754          * back too.
3755          */
3756         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
3757                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
3758                         /* Another chunk to move */
3759                         chk->sent = SCTP_DATAGRAM_UNSENT;
3760                         /* It should not be in flight */
3761                         TAILQ_REMOVE(&asoc->sent_queue, chk, sctp_next);
3762                         TAILQ_INSERT_AFTER(&asoc->send_queue, tp1, chk, sctp_next);
3763                         asoc->sent_queue_cnt--;
3764                         asoc->send_queue_cnt++;
3765                         sctp_ucount_decr(asoc->sent_queue_retran_cnt);
3766                 }
3767         }
3768 }
3769
3770 void
3771 sctp_express_handle_sack(struct sctp_tcb *stcb, uint32_t cumack,
3772     uint32_t rwnd, int nonce_sum_flag, int *abort_now)
3773 {
3774         struct sctp_nets *net;
3775         struct sctp_association *asoc;
3776         struct sctp_tmit_chunk *tp1, *tp2;
3777         uint32_t old_rwnd;
3778         int win_probe_recovery = 0;
3779         int win_probe_recovered = 0;
3780         int j, done_once = 0;
3781
3782
3783         if (sctp_logging_level & SCTP_LOG_SACK_ARRIVALS_ENABLE) {
3784                 sctp_misc_ints(SCTP_SACK_LOG_EXPRESS, cumack,
3785                     rwnd, stcb->asoc.last_acked_seq, stcb->asoc.peers_rwnd);
3786         }
3787         SCTP_TCB_LOCK_ASSERT(stcb);
3788 #ifdef SCTP_ASOCLOG_OF_TSNS
3789         stcb->asoc.cumack_log[stcb->asoc.cumack_log_at] = cumack;
3790         stcb->asoc.cumack_log_at++;
3791         if (stcb->asoc.cumack_log_at > SCTP_TSN_LOG_SIZE) {
3792                 stcb->asoc.cumack_log_at = 0;
3793         }
3794 #endif
3795         asoc = &stcb->asoc;
3796         old_rwnd = asoc->peers_rwnd;
3797         if (compare_with_wrap(asoc->last_acked_seq, cumack, MAX_TSN)) {
3798                 /* old ack */
3799                 return;
3800         } else if (asoc->last_acked_seq == cumack) {
3801                 /* Window update sack */
3802                 asoc->peers_rwnd = sctp_sbspace_sub(rwnd,
3803                     (uint32_t) (asoc->total_flight + (asoc->sent_queue_cnt * sctp_peer_chunk_oh)));
3804                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
3805                         /* SWS sender side engages */
3806                         asoc->peers_rwnd = 0;
3807                 }
3808                 if (asoc->peers_rwnd > old_rwnd) {
3809                         goto again;
3810                 }
3811                 return;
3812
3813         }
3814         /* First setup for CC stuff */
3815         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
3816                 net->prev_cwnd = net->cwnd;
3817                 net->net_ack = 0;
3818                 net->net_ack2 = 0;
3819
3820                 /*
3821                  * CMT: Reset CUC and Fast recovery algo variables before
3822                  * SACK processing
3823                  */
3824                 net->new_pseudo_cumack = 0;
3825                 net->will_exit_fast_recovery = 0;
3826         }
3827         if (sctp_strict_sacks) {
3828                 uint32_t send_s;
3829
3830                 if (!TAILQ_EMPTY(&asoc->sent_queue)) {
3831                         tp1 = TAILQ_LAST(&asoc->sent_queue,
3832                             sctpchunk_listhead);
3833                         send_s = tp1->rec.data.TSN_seq + 1;
3834                 } else {
3835                         send_s = asoc->sending_seq;
3836                 }
3837                 if ((cumack == send_s) ||
3838                     compare_with_wrap(cumack, send_s, MAX_TSN)) {
3839 #ifndef INVARIANTS
3840                         struct mbuf *oper;
3841
3842 #endif
3843 #ifdef INVARIANTS
3844                         panic("Impossible sack 1");
3845 #else
3846                         *abort_now = 1;
3847                         /* XXX */
3848                         oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)),
3849                             0, M_DONTWAIT, 1, MT_DATA);
3850                         if (oper) {
3851                                 struct sctp_paramhdr *ph;
3852                                 uint32_t *ippp;
3853
3854                                 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
3855                                     sizeof(uint32_t);
3856                                 ph = mtod(oper, struct sctp_paramhdr *);
3857                                 ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
3858                                 ph->param_length = htons(SCTP_BUF_LEN(oper));
3859                                 ippp = (uint32_t *) (ph + 1);
3860                                 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_25);
3861                         }
3862                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_25;
3863                         sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_PEER_FAULTY, oper);
3864                         return;
3865 #endif
3866                 }
3867         }
3868         asoc->this_sack_highest_gap = cumack;
3869         stcb->asoc.overall_error_count = 0;
3870         if (compare_with_wrap(cumack, asoc->last_acked_seq, MAX_TSN)) {
3871                 /* process the new consecutive TSN first */
3872                 tp1 = TAILQ_FIRST(&asoc->sent_queue);
3873                 while (tp1) {
3874                         tp2 = TAILQ_NEXT(tp1, sctp_next);
3875                         if (compare_with_wrap(cumack, tp1->rec.data.TSN_seq,
3876                             MAX_TSN) ||
3877                             cumack == tp1->rec.data.TSN_seq) {
3878                                 if (tp1->sent == SCTP_DATAGRAM_UNSENT) {
3879                                         printf("Warning, an unsent is now acked?\n");
3880                                 }
3881                                 /*
3882                                  * ECN Nonce: Add the nonce to the sender's
3883                                  * nonce sum
3884                                  */
3885                                 asoc->nonce_sum_expect_base += tp1->rec.data.ect_nonce;
3886                                 if (tp1->sent < SCTP_DATAGRAM_ACKED) {
3887                                         /*
3888                                          * If it is less than ACKED, it is
3889                                          * now no-longer in flight. Higher
3890                                          * values may occur during marking
3891                                          */
3892                                         if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3893                                                 if (sctp_logging_level & SCTP_FLIGHT_LOGGING_ENABLE) {
3894                                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_CA,
3895                                                             tp1->whoTo->flight_size,
3896                                                             tp1->book_size,
3897                                                             (uintptr_t) tp1->whoTo,
3898                                                             tp1->rec.data.TSN_seq);
3899                                                 }
3900                                                 sctp_flight_size_decrease(tp1);
3901                                                 sctp_total_flight_decrease(stcb, tp1);
3902                                         }
3903                                         tp1->whoTo->net_ack += tp1->send_size;
3904                                         if (tp1->snd_count < 2) {
3905                                                 /*
3906                                                  * True non-retransmited
3907                                                  * chunk
3908                                                  */
3909                                                 tp1->whoTo->net_ack2 +=
3910                                                     tp1->send_size;
3911
3912                                                 /* update RTO too? */
3913                                                 if (tp1->do_rtt) {
3914                                                         tp1->whoTo->RTO =
3915                                                             sctp_calculate_rto(stcb,
3916                                                             asoc, tp1->whoTo,
3917                                                             &tp1->sent_rcv_time,
3918                                                             sctp_align_safe_nocopy);
3919                                                         tp1->do_rtt = 0;
3920                                                 }
3921                                         }
3922                                         /*
3923                                          * CMT: CUCv2 algorithm. From the
3924                                          * cumack'd TSNs, for each TSN being
3925                                          * acked for the first time, set the
3926                                          * following variables for the
3927                                          * corresp destination.
3928                                          * new_pseudo_cumack will trigger a
3929                                          * cwnd update.
3930                                          * find_(rtx_)pseudo_cumack will
3931                                          * trigger search for the next
3932                                          * expected (rtx-)pseudo-cumack.
3933                                          */
3934                                         tp1->whoTo->new_pseudo_cumack = 1;
3935                                         tp1->whoTo->find_pseudo_cumack = 1;
3936                                         tp1->whoTo->find_rtx_pseudo_cumack = 1;
3937
3938                                         if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
3939                                                 sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK);
3940                                         }
3941                                 }
3942                                 if (tp1->sent == SCTP_DATAGRAM_RESEND) {
3943                                         sctp_ucount_decr(asoc->sent_queue_retran_cnt);
3944                                 }
3945                                 if (tp1->rec.data.chunk_was_revoked) {
3946                                         /* deflate the cwnd */
3947                                         tp1->whoTo->cwnd -= tp1->book_size;
3948                                         tp1->rec.data.chunk_was_revoked = 0;
3949                                 }
3950                                 tp1->sent = SCTP_DATAGRAM_ACKED;
3951                                 TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next);
3952                                 if (tp1->data) {
3953                                         sctp_free_bufspace(stcb, asoc, tp1, 1);
3954                                         sctp_m_freem(tp1->data);
3955                                 }
3956                                 if (sctp_logging_level & SCTP_SACK_LOGGING_ENABLE) {
3957                                         sctp_log_sack(asoc->last_acked_seq,
3958                                             cumack,
3959                                             tp1->rec.data.TSN_seq,
3960                                             0,
3961                                             0,
3962                                             SCTP_LOG_FREE_SENT);
3963                                 }
3964                                 tp1->data = NULL;
3965                                 asoc->sent_queue_cnt--;
3966                                 sctp_free_a_chunk(stcb, tp1);
3967                                 tp1 = tp2;
3968                         } else {
3969                                 break;
3970                         }
3971                 }
3972
3973         }
3974         if (stcb->sctp_socket) {
3975                 SOCKBUF_LOCK(&stcb->sctp_socket->so_snd);
3976                 if (sctp_logging_level & SCTP_WAKE_LOGGING_ENABLE) {
3977                         sctp_wakeup_log(stcb, cumack, 1, SCTP_WAKESND_FROM_SACK);
3978                 }
3979                 sctp_sowwakeup_locked(stcb->sctp_ep, stcb->sctp_socket);
3980         } else {
3981                 if (sctp_logging_level & SCTP_WAKE_LOGGING_ENABLE) {
3982                         sctp_wakeup_log(stcb, cumack, 1, SCTP_NOWAKE_FROM_SACK);
3983                 }
3984         }
3985
3986         /* JRS - Use the congestion control given in the CC module */
3987         if (asoc->last_acked_seq != cumack)
3988                 asoc->cc_functions.sctp_cwnd_update_after_sack(stcb, asoc, 1, 0, 0);
3989
3990         asoc->last_acked_seq = cumack;
3991
3992         if (TAILQ_EMPTY(&asoc->sent_queue)) {
3993                 /* nothing left in-flight */
3994                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
3995                         net->flight_size = 0;
3996                         net->partial_bytes_acked = 0;
3997                 }
3998                 asoc->total_flight = 0;
3999                 asoc->total_flight_count = 0;
4000         }
4001         /* Fix up the a-p-a-p for future PR-SCTP sends */
4002         if (compare_with_wrap(cumack, asoc->advanced_peer_ack_point, MAX_TSN)) {
4003                 asoc->advanced_peer_ack_point = cumack;
4004         }
4005         /* ECN Nonce updates */
4006         if (asoc->ecn_nonce_allowed) {
4007                 if (asoc->nonce_sum_check) {
4008                         if (nonce_sum_flag != ((asoc->nonce_sum_expect_base) & SCTP_SACK_NONCE_SUM)) {
4009                                 if (asoc->nonce_wait_for_ecne == 0) {
4010                                         struct sctp_tmit_chunk *lchk;
4011
4012                                         lchk = TAILQ_FIRST(&asoc->send_queue);
4013                                         asoc->nonce_wait_for_ecne = 1;
4014                                         if (lchk) {
4015                                                 asoc->nonce_wait_tsn = lchk->rec.data.TSN_seq;
4016                                         } else {
4017                                                 asoc->nonce_wait_tsn = asoc->sending_seq;
4018                                         }
4019                                 } else {
4020                                         if (compare_with_wrap(asoc->last_acked_seq, asoc->nonce_wait_tsn, MAX_TSN) ||
4021                                             (asoc->last_acked_seq == asoc->nonce_wait_tsn)) {
4022                                                 /*
4023                                                  * Misbehaving peer. We need
4024                                                  * to react to this guy
4025                                                  */
4026                                                 asoc->ecn_allowed = 0;
4027                                                 asoc->ecn_nonce_allowed = 0;
4028                                         }
4029                                 }
4030                         }
4031                 } else {
4032                         /* See if Resynchronization Possible */
4033                         if (compare_with_wrap(asoc->last_acked_seq, asoc->nonce_resync_tsn, MAX_TSN)) {
4034                                 asoc->nonce_sum_check = 1;
4035                                 /*
4036                                  * now we must calculate what the base is.
4037                                  * We do this based on two things, we know
4038                                  * the total's for all the segments
4039                                  * gap-acked in the SACK (none), We also
4040                                  * know the SACK's nonce sum, its in
4041                                  * nonce_sum_flag. So we can build a truth
4042                                  * table to back-calculate the new value of
4043                                  * asoc->nonce_sum_expect_base:
4044                                  *
4045                                  * SACK-flag-Value         Seg-Sums Base 0 0 0
4046                                  * 1                    0 1 0 1 1 1
4047                                  * 1 0
4048                                  */
4049                                 asoc->nonce_sum_expect_base = (0 ^ nonce_sum_flag) & SCTP_SACK_NONCE_SUM;
4050                         }
4051                 }
4052         }
4053         /* RWND update */
4054         asoc->peers_rwnd = sctp_sbspace_sub(rwnd,
4055             (uint32_t) (asoc->total_flight + (asoc->sent_queue_cnt * sctp_peer_chunk_oh)));
4056         if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4057                 /* SWS sender side engages */
4058                 asoc->peers_rwnd = 0;
4059         }
4060         if (asoc->peers_rwnd > old_rwnd) {
4061                 win_probe_recovery = 1;
4062         }
4063         /* Now assure a timer where data is queued at */
4064 again:
4065         j = 0;
4066         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4067                 if (win_probe_recovery && (net->window_probe)) {
4068                         net->window_probe = 0;
4069                         win_probe_recovered = 1;
4070                         /*
4071                          * Find first chunk that was used with window probe
4072                          * and clear the sent
4073                          */
4074                         /* sa_ignore FREED_MEMORY */
4075                         TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
4076                                 if (tp1->window_probe) {
4077                                         /* move back to data send queue */
4078                                         sctp_window_probe_recovery(stcb, asoc, net, tp1);
4079                                         break;
4080                                 }
4081                         }
4082                 }
4083                 if (net->flight_size) {
4084                         int to_ticks;
4085
4086                         if (net->RTO == 0) {
4087                                 to_ticks = MSEC_TO_TICKS(stcb->asoc.initial_rto);
4088                         } else {
4089                                 to_ticks = MSEC_TO_TICKS(net->RTO);
4090                         }
4091                         j++;
4092                         (void)SCTP_OS_TIMER_START(&net->rxt_timer.timer, to_ticks,
4093                             sctp_timeout_handler, &net->rxt_timer);
4094                 } else {
4095                         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4096                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
4097                                     stcb, net,
4098                                     SCTP_FROM_SCTP_INDATA + SCTP_LOC_22);
4099                         }
4100                         if (sctp_early_fr) {
4101                                 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
4102                                         SCTP_STAT_INCR(sctps_earlyfrstpidsck4);
4103                                         sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net,
4104                                             SCTP_FROM_SCTP_INDATA + SCTP_LOC_23);
4105                                 }
4106                         }
4107                 }
4108         }
4109         if ((j == 0) &&
4110             (!TAILQ_EMPTY(&asoc->sent_queue)) &&
4111             (asoc->sent_queue_retran_cnt == 0) &&
4112             (win_probe_recovered == 0) &&
4113             (done_once == 0)) {
4114                 /* huh, this should not happen */
4115                 sctp_fs_audit(asoc);
4116                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4117                         net->flight_size = 0;
4118                 }
4119                 asoc->total_flight = 0;
4120                 asoc->total_flight_count = 0;
4121                 asoc->sent_queue_retran_cnt = 0;
4122                 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
4123                         if (tp1->sent < SCTP_DATAGRAM_RESEND) {
4124                                 sctp_flight_size_increase(tp1);
4125                                 sctp_total_flight_increase(stcb, tp1);
4126                         } else if (tp1->sent == SCTP_DATAGRAM_RESEND) {
4127                                 asoc->sent_queue_retran_cnt++;
4128                         }
4129                 }
4130                 done_once = 1;
4131                 goto again;
4132         }
4133         /**********************************/
4134         /* Now what about shutdown issues */
4135         /**********************************/
4136         if (TAILQ_EMPTY(&asoc->send_queue) && TAILQ_EMPTY(&asoc->sent_queue)) {
4137                 /* nothing left on sendqueue.. consider done */
4138                 /* clean up */
4139                 if ((asoc->stream_queue_cnt == 1) &&
4140                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
4141                     (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED)) &&
4142                     (asoc->locked_on_sending)
4143                     ) {
4144                         struct sctp_stream_queue_pending *sp;
4145
4146                         /*
4147                          * I may be in a state where we got all across.. but
4148                          * cannot write more due to a shutdown... we abort
4149                          * since the user did not indicate EOR in this case.
4150                          * The sp will be cleaned during free of the asoc.
4151                          */
4152                         sp = TAILQ_LAST(&((asoc->locked_on_sending)->outqueue),
4153                             sctp_streamhead);
4154                         if ((sp) && (sp->length == 0) && (sp->msg_is_complete == 0)) {
4155                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
4156                                 asoc->locked_on_sending = NULL;
4157                                 asoc->stream_queue_cnt--;
4158                         }
4159                 }
4160                 if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) &&
4161                     (asoc->stream_queue_cnt == 0)) {
4162                         if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) {
4163                                 /* Need to abort here */
4164                                 struct mbuf *oper;
4165
4166                 abort_out_now:
4167                                 *abort_now = 1;
4168                                 /* XXX */
4169                                 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)),
4170                                     0, M_DONTWAIT, 1, MT_DATA);
4171                                 if (oper) {
4172                                         struct sctp_paramhdr *ph;
4173                                         uint32_t *ippp;
4174
4175                                         SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
4176                                             sizeof(uint32_t);
4177                                         ph = mtod(oper, struct sctp_paramhdr *);
4178                                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
4179                                         ph->param_length = htons(SCTP_BUF_LEN(oper));
4180                                         ippp = (uint32_t *) (ph + 1);
4181                                         *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_24);
4182                                 }
4183                                 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_24;
4184                                 sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_RESPONSE_TO_USER_REQ, oper);
4185                         } else {
4186                                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
4187                                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
4188                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
4189                                 }
4190                                 asoc->state = SCTP_STATE_SHUTDOWN_SENT;
4191                                 sctp_stop_timers_for_shutdown(stcb);
4192                                 sctp_send_shutdown(stcb,
4193                                     stcb->asoc.primary_destination);
4194                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
4195                                     stcb->sctp_ep, stcb, asoc->primary_destination);
4196                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
4197                                     stcb->sctp_ep, stcb, asoc->primary_destination);
4198                         }
4199                 } else if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) &&
4200                     (asoc->stream_queue_cnt == 0)) {
4201                         if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) {
4202                                 goto abort_out_now;
4203                         }
4204                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
4205                         asoc->state = SCTP_STATE_SHUTDOWN_ACK_SENT;
4206                         sctp_send_shutdown_ack(stcb,
4207                             stcb->asoc.primary_destination);
4208
4209                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
4210                             stcb->sctp_ep, stcb, asoc->primary_destination);
4211                 }
4212         }
4213         if (sctp_logging_level & SCTP_SACK_RWND_LOGGING_ENABLE) {
4214                 sctp_misc_ints(SCTP_SACK_RWND_UPDATE,
4215                     rwnd,
4216                     stcb->asoc.peers_rwnd,
4217                     stcb->asoc.total_flight,
4218                     stcb->asoc.total_output_queue_size);
4219         }
4220 }
4221
4222 void
4223 sctp_handle_sack(struct mbuf *m, int offset,
4224     struct sctp_sack_chunk *ch, struct sctp_tcb *stcb,
4225     struct sctp_nets *net_from, int *abort_now, int sack_len, uint32_t rwnd)
4226 {
4227         struct sctp_association *asoc;
4228         struct sctp_sack *sack;
4229         struct sctp_tmit_chunk *tp1, *tp2;
4230         uint32_t cum_ack, last_tsn, biggest_tsn_acked, biggest_tsn_newly_acked,
4231                  this_sack_lowest_newack;
4232         uint32_t sav_cum_ack;
4233         uint16_t num_seg, num_dup;
4234         uint16_t wake_him = 0;
4235         unsigned int sack_length;
4236         uint32_t send_s = 0;
4237         long j;
4238         int accum_moved = 0;
4239         int will_exit_fast_recovery = 0;
4240         uint32_t a_rwnd, old_rwnd;
4241         int win_probe_recovery = 0;
4242         int win_probe_recovered = 0;
4243         struct sctp_nets *net = NULL;
4244         int nonce_sum_flag, ecn_seg_sums = 0;
4245         int done_once;
4246         uint8_t reneged_all = 0;
4247         uint8_t cmt_dac_flag;
4248
4249         /*
4250          * we take any chance we can to service our queues since we cannot
4251          * get awoken when the socket is read from :<
4252          */
4253         /*
4254          * Now perform the actual SACK handling: 1) Verify that it is not an
4255          * old sack, if so discard. 2) If there is nothing left in the send
4256          * queue (cum-ack is equal to last acked) then you have a duplicate
4257          * too, update any rwnd change and verify no timers are running.
4258          * then return. 3) Process any new consequtive data i.e. cum-ack
4259          * moved process these first and note that it moved. 4) Process any
4260          * sack blocks. 5) Drop any acked from the queue. 6) Check for any
4261          * revoked blocks and mark. 7) Update the cwnd. 8) Nothing left,
4262          * sync up flightsizes and things, stop all timers and also check
4263          * for shutdown_pending state. If so then go ahead and send off the
4264          * shutdown. If in shutdown recv, send off the shutdown-ack and
4265          * start that timer, Ret. 9) Strike any non-acked things and do FR
4266          * procedure if needed being sure to set the FR flag. 10) Do pr-sctp
4267          * procedures. 11) Apply any FR penalties. 12) Assure we will SACK
4268          * if in shutdown_recv state.
4269          */
4270         SCTP_TCB_LOCK_ASSERT(stcb);
4271         sack = &ch->sack;
4272         /* CMT DAC algo */
4273         this_sack_lowest_newack = 0;
4274         j = 0;
4275         sack_length = (unsigned int)sack_len;
4276         /* ECN Nonce */
4277         SCTP_STAT_INCR(sctps_slowpath_sack);
4278         nonce_sum_flag = ch->ch.chunk_flags & SCTP_SACK_NONCE_SUM;
4279         cum_ack = last_tsn = ntohl(sack->cum_tsn_ack);
4280 #ifdef SCTP_ASOCLOG_OF_TSNS
4281         stcb->asoc.cumack_log[stcb->asoc.cumack_log_at] = cum_ack;
4282         stcb->asoc.cumack_log_at++;
4283         if (stcb->asoc.cumack_log_at > SCTP_TSN_LOG_SIZE) {
4284                 stcb->asoc.cumack_log_at = 0;
4285         }
4286 #endif
4287         num_seg = ntohs(sack->num_gap_ack_blks);
4288         a_rwnd = rwnd;
4289
4290         if (sctp_logging_level & SCTP_LOG_SACK_ARRIVALS_ENABLE) {
4291                 sctp_misc_ints(SCTP_SACK_LOG_NORMAL, cum_ack,
4292                     rwnd, stcb->asoc.last_acked_seq, stcb->asoc.peers_rwnd);
4293         }
4294         /* CMT DAC algo */
4295         cmt_dac_flag = ch->ch.chunk_flags & SCTP_SACK_CMT_DAC;
4296         num_dup = ntohs(sack->num_dup_tsns);
4297
4298         old_rwnd = stcb->asoc.peers_rwnd;
4299         stcb->asoc.overall_error_count = 0;
4300         asoc = &stcb->asoc;
4301         if (sctp_logging_level & SCTP_SACK_LOGGING_ENABLE) {
4302                 sctp_log_sack(asoc->last_acked_seq,
4303                     cum_ack,
4304                     0,
4305                     num_seg,
4306                     num_dup,
4307                     SCTP_LOG_NEW_SACK);
4308         }
4309         if ((num_dup) && (sctp_logging_level & (SCTP_FR_LOGGING_ENABLE | SCTP_EARLYFR_LOGGING_ENABLE))) {
4310                 int off_to_dup, iii;
4311                 uint32_t *dupdata, dblock;
4312
4313                 off_to_dup = (num_seg * sizeof(struct sctp_gap_ack_block)) + sizeof(struct sctp_sack_chunk);
4314                 if ((off_to_dup + (num_dup * sizeof(uint32_t))) <= sack_length) {
4315                         dupdata = (uint32_t *) sctp_m_getptr(m, off_to_dup,
4316                             sizeof(uint32_t), (uint8_t *) & dblock);
4317                         off_to_dup += sizeof(uint32_t);
4318                         if (dupdata) {
4319                                 for (iii = 0; iii < num_dup; iii++) {
4320                                         sctp_log_fr(*dupdata, 0, 0, SCTP_FR_DUPED);
4321                                         dupdata = (uint32_t *) sctp_m_getptr(m, off_to_dup,
4322                                             sizeof(uint32_t), (uint8_t *) & dblock);
4323                                         if (dupdata == NULL)
4324                                                 break;
4325                                         off_to_dup += sizeof(uint32_t);
4326
4327
4328                                 }
4329                         }
4330                 } else {
4331                         SCTP_PRINTF("Size invalid offset to dups:%d number dups:%d sack_len:%d num gaps:%d\n",
4332                             off_to_dup, num_dup, sack_length, num_seg);
4333                 }
4334         }
4335         if (sctp_strict_sacks) {
4336                 /* reality check */
4337                 if (!TAILQ_EMPTY(&asoc->sent_queue)) {
4338                         tp1 = TAILQ_LAST(&asoc->sent_queue,
4339                             sctpchunk_listhead);
4340                         send_s = tp1->rec.data.TSN_seq + 1;
4341                 } else {
4342                         send_s = asoc->sending_seq;
4343                 }
4344                 if (cum_ack == send_s ||
4345                     compare_with_wrap(cum_ack, send_s, MAX_TSN)) {
4346 #ifndef INVARIANTS
4347                         struct mbuf *oper;
4348
4349 #endif
4350 #ifdef INVARIANTS
4351         hopeless_peer:
4352                         panic("Impossible sack 1");
4353 #else
4354
4355
4356                         /*
4357                          * no way, we have not even sent this TSN out yet.
4358                          * Peer is hopelessly messed up with us.
4359                          */
4360         hopeless_peer:
4361                         *abort_now = 1;
4362                         /* XXX */
4363                         oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)),
4364                             0, M_DONTWAIT, 1, MT_DATA);
4365                         if (oper) {
4366                                 struct sctp_paramhdr *ph;
4367                                 uint32_t *ippp;
4368
4369                                 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
4370                                     sizeof(uint32_t);
4371                                 ph = mtod(oper, struct sctp_paramhdr *);
4372                                 ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
4373                                 ph->param_length = htons(SCTP_BUF_LEN(oper));
4374                                 ippp = (uint32_t *) (ph + 1);
4375                                 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_25);
4376                         }
4377                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_25;
4378                         sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_PEER_FAULTY, oper);
4379                         return;
4380 #endif
4381                 }
4382         }
4383         /**********************/
4384         /* 1) check the range */
4385         /**********************/
4386         if (compare_with_wrap(asoc->last_acked_seq, last_tsn, MAX_TSN)) {
4387                 /* acking something behind */
4388                 return;
4389         }
4390         sav_cum_ack = asoc->last_acked_seq;
4391
4392         /* update the Rwnd of the peer */
4393         if (TAILQ_EMPTY(&asoc->sent_queue) &&
4394             TAILQ_EMPTY(&asoc->send_queue) &&
4395             (asoc->stream_queue_cnt == 0)
4396             ) {
4397                 /* nothing left on send/sent and strmq */
4398                 if (sctp_logging_level & SCTP_LOG_RWND_ENABLE) {
4399                         sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK,
4400                             asoc->peers_rwnd, 0, 0, a_rwnd);
4401                 }
4402                 asoc->peers_rwnd = a_rwnd;
4403                 if (asoc->sent_queue_retran_cnt) {
4404                         asoc->sent_queue_retran_cnt = 0;
4405                 }
4406                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4407                         /* SWS sender side engages */
4408                         asoc->peers_rwnd = 0;
4409                 }
4410                 /* stop any timers */
4411                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4412                         sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
4413                             stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_26);
4414                         if (sctp_early_fr) {
4415                                 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
4416                                         SCTP_STAT_INCR(sctps_earlyfrstpidsck1);
4417                                         sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net,
4418                                             SCTP_FROM_SCTP_INDATA + SCTP_LOC_26);
4419                                 }
4420                         }
4421                         net->partial_bytes_acked = 0;
4422                         net->flight_size = 0;
4423                 }
4424                 asoc->total_flight = 0;
4425                 asoc->total_flight_count = 0;
4426                 return;
4427         }
4428         /*
4429          * We init netAckSz and netAckSz2 to 0. These are used to track 2
4430          * things. The total byte count acked is tracked in netAckSz AND
4431          * netAck2 is used to track the total bytes acked that are un-
4432          * amibguious and were never retransmitted. We track these on a per
4433          * destination address basis.
4434          */
4435         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4436                 net->prev_cwnd = net->cwnd;
4437                 net->net_ack = 0;
4438                 net->net_ack2 = 0;
4439
4440                 /*
4441                  * CMT: Reset CUC and Fast recovery algo variables before
4442                  * SACK processing
4443                  */
4444                 net->new_pseudo_cumack = 0;
4445                 net->will_exit_fast_recovery = 0;
4446         }
4447         /* process the new consecutive TSN first */
4448         tp1 = TAILQ_FIRST(&asoc->sent_queue);
4449         while (tp1) {
4450                 if (compare_with_wrap(last_tsn, tp1->rec.data.TSN_seq,
4451                     MAX_TSN) ||
4452                     last_tsn == tp1->rec.data.TSN_seq) {
4453                         if (tp1->sent != SCTP_DATAGRAM_UNSENT) {
4454                                 /*
4455                                  * ECN Nonce: Add the nonce to the sender's
4456                                  * nonce sum
4457                                  */
4458                                 asoc->nonce_sum_expect_base += tp1->rec.data.ect_nonce;
4459                                 accum_moved = 1;
4460                                 if (tp1->sent < SCTP_DATAGRAM_ACKED) {
4461                                         /*
4462                                          * If it is less than ACKED, it is
4463                                          * now no-longer in flight. Higher
4464                                          * values may occur during marking
4465                                          */
4466                                         if ((tp1->whoTo->dest_state &
4467                                             SCTP_ADDR_UNCONFIRMED) &&
4468                                             (tp1->snd_count < 2)) {
4469                                                 /*
4470                                                  * If there was no retran
4471                                                  * and the address is
4472                                                  * un-confirmed and we sent
4473                                                  * there and are now
4474                                                  * sacked.. its confirmed,
4475                                                  * mark it so.
4476                                                  */
4477                                                 tp1->whoTo->dest_state &=
4478                                                     ~SCTP_ADDR_UNCONFIRMED;
4479                                         }
4480                                         if (tp1->sent < SCTP_DATAGRAM_RESEND) {
4481                                                 if (sctp_logging_level & SCTP_FLIGHT_LOGGING_ENABLE) {
4482                                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_CA,
4483                                                             tp1->whoTo->flight_size,
4484                                                             tp1->book_size,
4485                                                             (uintptr_t) tp1->whoTo,
4486                                                             tp1->rec.data.TSN_seq);
4487                                                 }
4488                                                 sctp_flight_size_decrease(tp1);
4489                                                 sctp_total_flight_decrease(stcb, tp1);
4490                                         }
4491                                         tp1->whoTo->net_ack += tp1->send_size;
4492
4493                                         /* CMT SFR and DAC algos */
4494                                         this_sack_lowest_newack = tp1->rec.data.TSN_seq;
4495                                         tp1->whoTo->saw_newack = 1;
4496
4497                                         if (tp1->snd_count < 2) {
4498                                                 /*
4499                                                  * True non-retransmited
4500                                                  * chunk
4501                                                  */
4502                                                 tp1->whoTo->net_ack2 +=
4503                                                     tp1->send_size;
4504
4505                                                 /* update RTO too? */
4506                                                 if (tp1->do_rtt) {
4507                                                         tp1->whoTo->RTO =
4508                                                             sctp_calculate_rto(stcb,
4509                                                             asoc, tp1->whoTo,
4510                                                             &tp1->sent_rcv_time,
4511                                                             sctp_align_safe_nocopy);
4512                                                         tp1->do_rtt = 0;
4513                                                 }
4514                                         }
4515                                         /*
4516                                          * CMT: CUCv2 algorithm. From the
4517                                          * cumack'd TSNs, for each TSN being
4518                                          * acked for the first time, set the
4519                                          * following variables for the
4520                                          * corresp destination.
4521                                          * new_pseudo_cumack will trigger a
4522                                          * cwnd update.
4523                                          * find_(rtx_)pseudo_cumack will
4524                                          * trigger search for the next
4525                                          * expected (rtx-)pseudo-cumack.
4526                                          */
4527                                         tp1->whoTo->new_pseudo_cumack = 1;
4528                                         tp1->whoTo->find_pseudo_cumack = 1;
4529                                         tp1->whoTo->find_rtx_pseudo_cumack = 1;
4530
4531
4532                                         if (sctp_logging_level & SCTP_SACK_LOGGING_ENABLE) {
4533                                                 sctp_log_sack(asoc->last_acked_seq,
4534                                                     cum_ack,
4535                                                     tp1->rec.data.TSN_seq,
4536                                                     0,
4537                                                     0,
4538                                                     SCTP_LOG_TSN_ACKED);
4539                                         }
4540                                         if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
4541                                                 sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK);
4542                                         }
4543                                 }
4544                                 if (tp1->sent == SCTP_DATAGRAM_RESEND) {
4545                                         sctp_ucount_decr(asoc->sent_queue_retran_cnt);
4546 #ifdef SCTP_AUDITING_ENABLED
4547                                         sctp_audit_log(0xB3,
4548                                             (asoc->sent_queue_retran_cnt & 0x000000ff));
4549 #endif
4550                                 }
4551                                 if (tp1->rec.data.chunk_was_revoked) {
4552                                         /* deflate the cwnd */
4553                                         tp1->whoTo->cwnd -= tp1->book_size;
4554                                         tp1->rec.data.chunk_was_revoked = 0;
4555                                 }
4556                                 tp1->sent = SCTP_DATAGRAM_ACKED;
4557                         }
4558                 } else {
4559                         break;
4560                 }
4561                 tp1 = TAILQ_NEXT(tp1, sctp_next);
4562         }
4563         biggest_tsn_newly_acked = biggest_tsn_acked = last_tsn;
4564         /* always set this up to cum-ack */
4565         asoc->this_sack_highest_gap = last_tsn;
4566
4567         /* Move offset up to point to gaps/dups */
4568         offset += sizeof(struct sctp_sack_chunk);
4569         if (((num_seg * (sizeof(struct sctp_gap_ack_block))) + sizeof(struct sctp_sack_chunk)) > sack_length) {
4570
4571                 /* skip corrupt segments */
4572                 goto skip_segments;
4573         }
4574         if (num_seg > 0) {
4575
4576                 /*
4577                  * CMT: SFR algo (and HTNA) - this_sack_highest_newack has
4578                  * to be greater than the cumack. Also reset saw_newack to 0
4579                  * for all dests.
4580                  */
4581                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4582                         net->saw_newack = 0;
4583                         net->this_sack_highest_newack = last_tsn;
4584                 }
4585
4586                 /*
4587                  * thisSackHighestGap will increase while handling NEW
4588                  * segments this_sack_highest_newack will increase while
4589                  * handling NEWLY ACKED chunks. this_sack_lowest_newack is
4590                  * used for CMT DAC algo. saw_newack will also change.
4591                  */
4592                 sctp_handle_segments(m, &offset, stcb, asoc, ch, last_tsn,
4593                     &biggest_tsn_acked, &biggest_tsn_newly_acked, &this_sack_lowest_newack,
4594                     num_seg, &ecn_seg_sums);
4595
4596                 if (sctp_strict_sacks) {
4597                         /*
4598                          * validate the biggest_tsn_acked in the gap acks if
4599                          * strict adherence is wanted.
4600                          */
4601                         if ((biggest_tsn_acked == send_s) ||
4602                             (compare_with_wrap(biggest_tsn_acked, send_s, MAX_TSN))) {
4603                                 /*
4604                                  * peer is either confused or we are under
4605                                  * attack. We must abort.
4606                                  */
4607                                 goto hopeless_peer;
4608                         }
4609                 }
4610         }
4611 skip_segments:
4612         /*******************************************/
4613         /* cancel ALL T3-send timer if accum moved */
4614         /*******************************************/
4615         if (sctp_cmt_on_off) {
4616                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4617                         if (net->new_pseudo_cumack)
4618                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
4619                                     stcb, net,
4620                                     SCTP_FROM_SCTP_INDATA + SCTP_LOC_27);
4621
4622                 }
4623         } else {
4624                 if (accum_moved) {
4625                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4626                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
4627                                     stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_28);
4628                         }
4629                 }
4630         }
4631         /********************************************/
4632         /* drop the acked chunks from the sendqueue */
4633         /********************************************/
4634         asoc->last_acked_seq = cum_ack;
4635
4636         tp1 = TAILQ_FIRST(&asoc->sent_queue);
4637         if (tp1 == NULL)
4638                 goto done_with_it;
4639         do {
4640                 if (compare_with_wrap(tp1->rec.data.TSN_seq, cum_ack,
4641                     MAX_TSN)) {
4642                         break;
4643                 }
4644                 if (tp1->sent == SCTP_DATAGRAM_UNSENT) {
4645                         /* no more sent on list */
4646                         printf("Warning, tp1->sent == %d and its now acked?\n",
4647                             tp1->sent);
4648                 }
4649                 tp2 = TAILQ_NEXT(tp1, sctp_next);
4650                 TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next);
4651                 if (tp1->pr_sctp_on) {
4652                         if (asoc->pr_sctp_cnt != 0)
4653                                 asoc->pr_sctp_cnt--;
4654                 }
4655                 if ((TAILQ_FIRST(&asoc->sent_queue) == NULL) &&
4656                     (asoc->total_flight > 0)) {
4657 #ifdef INVARIANTS
4658                         panic("Warning flight size is postive and should be 0");
4659 #else
4660                         SCTP_PRINTF("Warning flight size incorrect should be 0 is %d\n",
4661                             asoc->total_flight);
4662 #endif
4663                         asoc->total_flight = 0;
4664                 }
4665                 if (tp1->data) {
4666                         sctp_free_bufspace(stcb, asoc, tp1, 1);
4667                         sctp_m_freem(tp1->data);
4668                         if (PR_SCTP_BUF_ENABLED(tp1->flags)) {
4669                                 asoc->sent_queue_cnt_removeable--;
4670                         }
4671                 }
4672                 if (sctp_logging_level & SCTP_SACK_LOGGING_ENABLE) {
4673                         sctp_log_sack(asoc->last_acked_seq,
4674                             cum_ack,
4675                             tp1->rec.data.TSN_seq,
4676                             0,
4677                             0,
4678                             SCTP_LOG_FREE_SENT);
4679                 }
4680                 tp1->data = NULL;
4681                 asoc->sent_queue_cnt--;
4682                 sctp_free_a_chunk(stcb, tp1);
4683                 wake_him++;
4684                 tp1 = tp2;
4685         } while (tp1 != NULL);
4686
4687 done_with_it:
4688         if ((wake_him) && (stcb->sctp_socket)) {
4689                 SOCKBUF_LOCK(&stcb->sctp_socket->so_snd);
4690                 if (sctp_logging_level & SCTP_WAKE_LOGGING_ENABLE) {
4691                         sctp_wakeup_log(stcb, cum_ack, wake_him, SCTP_WAKESND_FROM_SACK);
4692                 }
4693                 sctp_sowwakeup_locked(stcb->sctp_ep, stcb->sctp_socket);
4694         } else {
4695                 if (sctp_logging_level & SCTP_WAKE_LOGGING_ENABLE) {
4696                         sctp_wakeup_log(stcb, cum_ack, wake_him, SCTP_NOWAKE_FROM_SACK);
4697                 }
4698         }
4699
4700         if (asoc->fast_retran_loss_recovery && accum_moved) {
4701                 if (compare_with_wrap(asoc->last_acked_seq,
4702                     asoc->fast_recovery_tsn, MAX_TSN) ||
4703                     asoc->last_acked_seq == asoc->fast_recovery_tsn) {
4704                         /* Setup so we will exit RFC2582 fast recovery */
4705                         will_exit_fast_recovery = 1;
4706                 }
4707         }
4708         /*
4709          * Check for revoked fragments:
4710          *
4711          * if Previous sack - Had no frags then we can't have any revoked if
4712          * Previous sack - Had frag's then - If we now have frags aka
4713          * num_seg > 0 call sctp_check_for_revoked() to tell if peer revoked
4714          * some of them. else - The peer revoked all ACKED fragments, since
4715          * we had some before and now we have NONE.
4716          */
4717
4718         if (num_seg)
4719                 sctp_check_for_revoked(stcb, asoc, cum_ack, biggest_tsn_acked);
4720         else if (asoc->saw_sack_with_frags) {
4721                 int cnt_revoked = 0;
4722
4723                 tp1 = TAILQ_FIRST(&asoc->sent_queue);
4724                 if (tp1 != NULL) {
4725                         /* Peer revoked all dg's marked or acked */
4726                         TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
4727                                 if ((tp1->sent > SCTP_DATAGRAM_RESEND) &&
4728                                     (tp1->sent < SCTP_FORWARD_TSN_SKIP)) {
4729                                         tp1->sent = SCTP_DATAGRAM_SENT;
4730                                         if (sctp_logging_level & SCTP_FLIGHT_LOGGING_ENABLE) {
4731                                                 sctp_misc_ints(SCTP_FLIGHT_LOG_UP_REVOKE,
4732                                                     tp1->whoTo->flight_size,
4733                                                     tp1->book_size,
4734                                                     (uintptr_t) tp1->whoTo,
4735                                                     tp1->rec.data.TSN_seq);
4736                                         }
4737                                         sctp_flight_size_increase(tp1);
4738                                         sctp_total_flight_increase(stcb, tp1);
4739                                         tp1->rec.data.chunk_was_revoked = 1;
4740                                         /*
4741                                          * To ensure that this increase in
4742                                          * flightsize, which is artificial,
4743                                          * does not throttle the sender, we
4744                                          * also increase the cwnd
4745                                          * artificially.
4746                                          */
4747                                         tp1->whoTo->cwnd += tp1->book_size;
4748                                         cnt_revoked++;
4749                                 }
4750                         }
4751                         if (cnt_revoked) {
4752                                 reneged_all = 1;
4753                         }
4754                 }
4755                 asoc->saw_sack_with_frags = 0;
4756         }
4757         if (num_seg)
4758                 asoc->saw_sack_with_frags = 1;
4759         else
4760                 asoc->saw_sack_with_frags = 0;
4761
4762         /* JRS - Use the congestion control given in the CC module */
4763         asoc->cc_functions.sctp_cwnd_update_after_sack(stcb, asoc, accum_moved, reneged_all, will_exit_fast_recovery);
4764
4765         if (TAILQ_EMPTY(&asoc->sent_queue)) {
4766                 /* nothing left in-flight */
4767                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4768                         /* stop all timers */
4769                         if (sctp_early_fr) {
4770                                 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
4771                                         SCTP_STAT_INCR(sctps_earlyfrstpidsck4);
4772                                         sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net,
4773                                             SCTP_FROM_SCTP_INDATA + SCTP_LOC_29);
4774                                 }
4775                         }
4776                         sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
4777                             stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_30);
4778                         net->flight_size = 0;
4779                         net->partial_bytes_acked = 0;
4780                 }
4781                 asoc->total_flight = 0;
4782                 asoc->total_flight_count = 0;
4783         }
4784         /**********************************/
4785         /* Now what about shutdown issues */
4786         /**********************************/
4787         if (TAILQ_EMPTY(&asoc->send_queue) && TAILQ_EMPTY(&asoc->sent_queue)) {
4788                 /* nothing left on sendqueue.. consider done */
4789                 if (sctp_logging_level & SCTP_LOG_RWND_ENABLE) {
4790                         sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK,
4791                             asoc->peers_rwnd, 0, 0, a_rwnd);
4792                 }
4793                 asoc->peers_rwnd = a_rwnd;
4794                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4795                         /* SWS sender side engages */
4796                         asoc->peers_rwnd = 0;
4797                 }
4798                 /* clean up */
4799                 if ((asoc->stream_queue_cnt == 1) &&
4800                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
4801                     (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED)) &&
4802                     (asoc->locked_on_sending)
4803                     ) {
4804                         struct sctp_stream_queue_pending *sp;
4805
4806                         /*
4807                          * I may be in a state where we got all across.. but
4808                          * cannot write more due to a shutdown... we abort
4809                          * since the user did not indicate EOR in this case.
4810                          */
4811                         sp = TAILQ_LAST(&((asoc->locked_on_sending)->outqueue),
4812                             sctp_streamhead);
4813                         if ((sp) && (sp->length == 0) && (sp->msg_is_complete == 0)) {
4814                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
4815                                 asoc->locked_on_sending = NULL;
4816                                 asoc->stream_queue_cnt--;
4817                         }
4818                 }
4819                 if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) &&
4820                     (asoc->stream_queue_cnt == 0)) {
4821                         if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) {
4822                                 /* Need to abort here */
4823                                 struct mbuf *oper;
4824
4825                 abort_out_now:
4826                                 *abort_now = 1;
4827                                 /* XXX */
4828                                 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)),
4829                                     0, M_DONTWAIT, 1, MT_DATA);
4830                                 if (oper) {
4831                                         struct sctp_paramhdr *ph;
4832                                         uint32_t *ippp;
4833
4834                                         SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
4835                                             sizeof(uint32_t);
4836                                         ph = mtod(oper, struct sctp_paramhdr *);
4837                                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
4838                                         ph->param_length = htons(SCTP_BUF_LEN(oper));
4839                                         ippp = (uint32_t *) (ph + 1);
4840                                         *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_31);
4841                                 }
4842                                 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_31;
4843                                 sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_RESPONSE_TO_USER_REQ, oper);
4844                                 return;
4845                         } else {
4846                                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
4847                                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
4848                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
4849                                 }
4850                                 asoc->state = SCTP_STATE_SHUTDOWN_SENT;
4851                                 sctp_stop_timers_for_shutdown(stcb);
4852                                 sctp_send_shutdown(stcb,
4853                                     stcb->asoc.primary_destination);
4854                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
4855                                     stcb->sctp_ep, stcb, asoc->primary_destination);
4856                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
4857                                     stcb->sctp_ep, stcb, asoc->primary_destination);
4858                         }
4859                         return;
4860                 } else if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) &&
4861                     (asoc->stream_queue_cnt == 0)) {
4862                         if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) {
4863                                 goto abort_out_now;
4864                         }
4865                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
4866                         asoc->state = SCTP_STATE_SHUTDOWN_ACK_SENT;
4867                         sctp_send_shutdown_ack(stcb,
4868                             stcb->asoc.primary_destination);
4869
4870                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
4871                             stcb->sctp_ep, stcb, asoc->primary_destination);
4872                         return;
4873                 }
4874         }
4875         /*
4876          * Now here we are going to recycle net_ack for a different use...
4877          * HEADS UP.
4878          */
4879         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4880                 net->net_ack = 0;
4881         }
4882
4883         /*
4884          * CMT DAC algorithm: If SACK DAC flag was 0, then no extra marking
4885          * to be done. Setting this_sack_lowest_newack to the cum_ack will
4886          * automatically ensure that.
4887          */
4888         if (sctp_cmt_on_off && sctp_cmt_use_dac && (cmt_dac_flag == 0)) {
4889                 this_sack_lowest_newack = cum_ack;
4890         }
4891         if (num_seg > 0) {
4892                 sctp_strike_gap_ack_chunks(stcb, asoc, biggest_tsn_acked,
4893                     biggest_tsn_newly_acked, this_sack_lowest_newack, accum_moved);
4894         }
4895         /*********************************************/
4896         /* Here we perform PR-SCTP procedures        */
4897         /* (section 4.2)                             */
4898         /*********************************************/
4899         /* C1. update advancedPeerAckPoint */
4900         if (compare_with_wrap(cum_ack, asoc->advanced_peer_ack_point, MAX_TSN)) {
4901                 asoc->advanced_peer_ack_point = cum_ack;
4902         }
4903         /* C2. try to further move advancedPeerAckPoint ahead */
4904
4905         if ((asoc->peer_supports_prsctp) && (asoc->pr_sctp_cnt > 0)) {
4906                 struct sctp_tmit_chunk *lchk;
4907
4908                 lchk = sctp_try_advance_peer_ack_point(stcb, asoc);
4909                 /* C3. See if we need to send a Fwd-TSN */
4910                 if (compare_with_wrap(asoc->advanced_peer_ack_point, cum_ack,
4911                     MAX_TSN)) {
4912                         /*
4913                          * ISSUE with ECN, see FWD-TSN processing for notes
4914                          * on issues that will occur when the ECN NONCE
4915                          * stuff is put into SCTP for cross checking.
4916                          */
4917                         send_forward_tsn(stcb, asoc);
4918
4919                         /*
4920                          * ECN Nonce: Disable Nonce Sum check when FWD TSN
4921                          * is sent and store resync tsn
4922                          */
4923                         asoc->nonce_sum_check = 0;
4924                         asoc->nonce_resync_tsn = asoc->advanced_peer_ack_point;
4925                         if (lchk) {
4926                                 /* Assure a timer is up */
4927                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND,
4928                                     stcb->sctp_ep, stcb, lchk->whoTo);
4929                         }
4930                 }
4931         }
4932         /* JRS - Use the congestion control given in the CC module */
4933         asoc->cc_functions.sctp_cwnd_update_after_fr(stcb, asoc);
4934
4935         /******************************************************************
4936          *  Here we do the stuff with ECN Nonce checking.
4937          *  We basically check to see if the nonce sum flag was incorrect
4938          *  or if resynchronization needs to be done. Also if we catch a
4939          *  misbehaving receiver we give him the kick.
4940          ******************************************************************/
4941
4942         if (asoc->ecn_nonce_allowed) {
4943                 if (asoc->nonce_sum_check) {
4944                         if (nonce_sum_flag != ((asoc->nonce_sum_expect_base + ecn_seg_sums) & SCTP_SACK_NONCE_SUM)) {
4945                                 if (asoc->nonce_wait_for_ecne == 0) {
4946                                         struct sctp_tmit_chunk *lchk;
4947
4948                                         lchk = TAILQ_FIRST(&asoc->send_queue);
4949                                         asoc->nonce_wait_for_ecne = 1;
4950                                         if (lchk) {
4951                                                 asoc->nonce_wait_tsn = lchk->rec.data.TSN_seq;
4952                                         } else {
4953                                                 asoc->nonce_wait_tsn = asoc->sending_seq;
4954                                         }
4955                                 } else {
4956                                         if (compare_with_wrap(asoc->last_acked_seq, asoc->nonce_wait_tsn, MAX_TSN) ||
4957                                             (asoc->last_acked_seq == asoc->nonce_wait_tsn)) {
4958                                                 /*
4959                                                  * Misbehaving peer. We need
4960                                                  * to react to this guy
4961                                                  */
4962                                                 asoc->ecn_allowed = 0;
4963                                                 asoc->ecn_nonce_allowed = 0;
4964                                         }
4965                                 }
4966                         }
4967                 } else {
4968                         /* See if Resynchronization Possible */
4969                         if (compare_with_wrap(asoc->last_acked_seq, asoc->nonce_resync_tsn, MAX_TSN)) {
4970                                 asoc->nonce_sum_check = 1;
4971                                 /*
4972                                  * now we must calculate what the base is.
4973                                  * We do this based on two things, we know
4974                                  * the total's for all the segments
4975                                  * gap-acked in the SACK, its stored in
4976                                  * ecn_seg_sums. We also know the SACK's
4977                                  * nonce sum, its in nonce_sum_flag. So we
4978                                  * can build a truth table to back-calculate
4979                                  * the new value of
4980                                  * asoc->nonce_sum_expect_base:
4981                                  *
4982                                  * SACK-flag-Value         Seg-Sums Base 0 0 0
4983                                  * 1                    0 1 0 1 1 1
4984                                  * 1 0
4985                                  */
4986                                 asoc->nonce_sum_expect_base = (ecn_seg_sums ^ nonce_sum_flag) & SCTP_SACK_NONCE_SUM;
4987                         }
4988                 }
4989         }
4990         /* Now are we exiting loss recovery ? */
4991         if (will_exit_fast_recovery) {
4992                 /* Ok, we must exit fast recovery */
4993                 asoc->fast_retran_loss_recovery = 0;
4994         }
4995         if ((asoc->sat_t3_loss_recovery) &&
4996             ((compare_with_wrap(asoc->last_acked_seq, asoc->sat_t3_recovery_tsn,
4997             MAX_TSN) ||
4998             (asoc->last_acked_seq == asoc->sat_t3_recovery_tsn)))) {
4999                 /* end satellite t3 loss recovery */
5000                 asoc->sat_t3_loss_recovery = 0;
5001         }
5002         /*
5003          * CMT Fast recovery
5004          */
5005         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5006                 if (net->will_exit_fast_recovery) {
5007                         /* Ok, we must exit fast recovery */
5008                         net->fast_retran_loss_recovery = 0;
5009                 }
5010         }
5011
5012         /* Adjust and set the new rwnd value */
5013         if (sctp_logging_level & SCTP_LOG_RWND_ENABLE) {
5014                 sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK,
5015                     asoc->peers_rwnd, asoc->total_flight, (asoc->sent_queue_cnt * sctp_peer_chunk_oh), a_rwnd);
5016         }
5017         asoc->peers_rwnd = sctp_sbspace_sub(a_rwnd,
5018             (uint32_t) (asoc->total_flight + (asoc->sent_queue_cnt * sctp_peer_chunk_oh)));
5019         if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
5020                 /* SWS sender side engages */
5021                 asoc->peers_rwnd = 0;
5022         }
5023         if (asoc->peers_rwnd > old_rwnd) {
5024                 win_probe_recovery = 1;
5025         }
5026         /*
5027          * Now we must setup so we have a timer up for anyone with
5028          * outstanding data.
5029          */
5030         done_once = 0;
5031 again:
5032         j = 0;
5033         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5034                 if (win_probe_recovery && (net->window_probe)) {
5035                         net->window_probe = 0;
5036                         win_probe_recovered = 1;
5037                         /*-
5038                          * Find first chunk that was used with
5039                          * window probe and clear the event. Put
5040                          * it back into the send queue as if has
5041                          * not been sent.
5042                          */
5043                         TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
5044                                 if (tp1->window_probe) {
5045                                         sctp_window_probe_recovery(stcb, asoc, net, tp1);
5046                                         break;
5047                                 }
5048                         }
5049                 }
5050                 if (net->flight_size) {
5051                         j++;
5052                         sctp_timer_start(SCTP_TIMER_TYPE_SEND,
5053                             stcb->sctp_ep, stcb, net);
5054                 } else {
5055                         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
5056                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
5057                                     stcb, net,
5058                                     SCTP_FROM_SCTP_INDATA + SCTP_LOC_22);
5059                         }
5060                         if (sctp_early_fr) {
5061                                 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
5062                                         SCTP_STAT_INCR(sctps_earlyfrstpidsck4);
5063                                         sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net,
5064                                             SCTP_FROM_SCTP_INDATA + SCTP_LOC_23);
5065                                 }
5066                         }
5067                 }
5068         }
5069         if ((j == 0) &&
5070             (!TAILQ_EMPTY(&asoc->sent_queue)) &&
5071             (asoc->sent_queue_retran_cnt == 0) &&
5072             (win_probe_recovered == 0) &&
5073             (done_once == 0)) {
5074                 /* huh, this should not happen */
5075                 sctp_fs_audit(asoc);
5076                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5077                         net->flight_size = 0;
5078                 }
5079                 asoc->total_flight = 0;
5080                 asoc->total_flight_count = 0;
5081                 asoc->sent_queue_retran_cnt = 0;
5082                 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
5083                         if (tp1->sent < SCTP_DATAGRAM_RESEND) {
5084                                 sctp_flight_size_increase(tp1);
5085                                 sctp_total_flight_increase(stcb, tp1);
5086                         } else if (tp1->sent == SCTP_DATAGRAM_RESEND) {
5087                                 asoc->sent_queue_retran_cnt++;
5088                         }
5089                 }
5090                 done_once = 1;
5091                 goto again;
5092         }
5093         if (sctp_logging_level & SCTP_SACK_RWND_LOGGING_ENABLE) {
5094                 sctp_misc_ints(SCTP_SACK_RWND_UPDATE,
5095                     a_rwnd,
5096                     stcb->asoc.peers_rwnd,
5097                     stcb->asoc.total_flight,
5098                     stcb->asoc.total_output_queue_size);
5099         }
5100 }
5101
5102 void
5103 sctp_update_acked(struct sctp_tcb *stcb, struct sctp_shutdown_chunk *cp,
5104     struct sctp_nets *netp, int *abort_flag)
5105 {
5106         /* Copy cum-ack */
5107         uint32_t cum_ack, a_rwnd;
5108
5109         cum_ack = ntohl(cp->cumulative_tsn_ack);
5110         /* Arrange so a_rwnd does NOT change */
5111         a_rwnd = stcb->asoc.peers_rwnd + stcb->asoc.total_flight;
5112
5113         /* Now call the express sack handling */
5114         sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 0, abort_flag);
5115 }
5116
5117 static void
5118 sctp_kick_prsctp_reorder_queue(struct sctp_tcb *stcb,
5119     struct sctp_stream_in *strmin)
5120 {
5121         struct sctp_queued_to_read *ctl, *nctl;
5122         struct sctp_association *asoc;
5123         int tt;
5124
5125         asoc = &stcb->asoc;
5126         tt = strmin->last_sequence_delivered;
5127         /*
5128          * First deliver anything prior to and including the stream no that
5129          * came in
5130          */
5131         ctl = TAILQ_FIRST(&strmin->inqueue);
5132         while (ctl) {
5133                 nctl = TAILQ_NEXT(ctl, next);
5134                 if (compare_with_wrap(tt, ctl->sinfo_ssn, MAX_SEQ) ||
5135                     (tt == ctl->sinfo_ssn)) {
5136                         /* this is deliverable now */
5137                         TAILQ_REMOVE(&strmin->inqueue, ctl, next);
5138                         /* subtract pending on streams */
5139                         asoc->size_on_all_streams -= ctl->length;
5140                         sctp_ucount_decr(asoc->cnt_on_all_streams);
5141                         /* deliver it to at least the delivery-q */
5142                         if (stcb->sctp_socket) {
5143                                 sctp_add_to_readq(stcb->sctp_ep, stcb,
5144                                     ctl,
5145                                     &stcb->sctp_socket->so_rcv, 1);
5146                         }
5147                 } else {
5148                         /* no more delivery now. */
5149                         break;
5150                 }
5151                 ctl = nctl;
5152         }
5153         /*
5154          * now we must deliver things in queue the normal way  if any are
5155          * now ready.
5156          */
5157         tt = strmin->last_sequence_delivered + 1;
5158         ctl = TAILQ_FIRST(&strmin->inqueue);
5159         while (ctl) {
5160                 nctl = TAILQ_NEXT(ctl, next);
5161                 if (tt == ctl->sinfo_ssn) {
5162                         /* this is deliverable now */
5163                         TAILQ_REMOVE(&strmin->inqueue, ctl, next);
5164                         /* subtract pending on streams */
5165                         asoc->size_on_all_streams -= ctl->length;
5166                         sctp_ucount_decr(asoc->cnt_on_all_streams);
5167                         /* deliver it to at least the delivery-q */
5168                         strmin->last_sequence_delivered = ctl->sinfo_ssn;
5169                         if (stcb->sctp_socket) {
5170                                 sctp_add_to_readq(stcb->sctp_ep, stcb,
5171                                     ctl,
5172                                     &stcb->sctp_socket->so_rcv, 1);
5173                         }
5174                         tt = strmin->last_sequence_delivered + 1;
5175                 } else {
5176                         break;
5177                 }
5178                 ctl = nctl;
5179         }
5180 }
5181
5182 void
5183 sctp_handle_forward_tsn(struct sctp_tcb *stcb,
5184     struct sctp_forward_tsn_chunk *fwd, int *abort_flag, struct mbuf *m, int offset)
5185 {
5186         /*
5187          * ISSUES that MUST be fixed for ECN! When we are the sender of the
5188          * forward TSN, when the SACK comes back that acknowledges the
5189          * FWD-TSN we must reset the NONCE sum to match correctly. This will
5190          * get quite tricky since we may have sent more data interveneing
5191          * and must carefully account for what the SACK says on the nonce
5192          * and any gaps that are reported. This work will NOT be done here,
5193          * but I note it here since it is really related to PR-SCTP and
5194          * FWD-TSN's
5195          */
5196
5197         /* The pr-sctp fwd tsn */
5198         /*
5199          * here we will perform all the data receiver side steps for
5200          * processing FwdTSN, as required in by pr-sctp draft:
5201          *
5202          * Assume we get FwdTSN(x):
5203          *
5204          * 1) update local cumTSN to x 2) try to further advance cumTSN to x +
5205          * others we have 3) examine and update re-ordering queue on
5206          * pr-in-streams 4) clean up re-assembly queue 5) Send a sack to
5207          * report where we are.
5208          */
5209         struct sctp_association *asoc;
5210         uint32_t new_cum_tsn, gap, back_out_htsn;
5211         unsigned int i, cnt_gone, fwd_sz, cumack_set_flag, m_size;
5212         struct sctp_stream_in *strm;
5213         struct sctp_tmit_chunk *chk, *at;
5214
5215         cumack_set_flag = 0;
5216         asoc = &stcb->asoc;
5217         cnt_gone = 0;
5218         if ((fwd_sz = ntohs(fwd->ch.chunk_length)) < sizeof(struct sctp_forward_tsn_chunk)) {
5219                 SCTPDBG(SCTP_DEBUG_INDATA1,
5220                     "Bad size too small/big fwd-tsn\n");
5221                 return;
5222         }
5223         m_size = (stcb->asoc.mapping_array_size << 3);
5224         /*************************************************************/
5225         /* 1. Here we update local cumTSN and shift the bitmap array */
5226         /*************************************************************/
5227         new_cum_tsn = ntohl(fwd->new_cumulative_tsn);
5228
5229         if (compare_with_wrap(asoc->cumulative_tsn, new_cum_tsn, MAX_TSN) ||
5230             asoc->cumulative_tsn == new_cum_tsn) {
5231                 /* Already got there ... */
5232                 return;
5233         }
5234         back_out_htsn = asoc->highest_tsn_inside_map;
5235         if (compare_with_wrap(new_cum_tsn, asoc->highest_tsn_inside_map,
5236             MAX_TSN)) {
5237                 asoc->highest_tsn_inside_map = new_cum_tsn;
5238                 if (sctp_logging_level & SCTP_MAP_LOGGING_ENABLE) {
5239                         sctp_log_map(0, 0, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
5240                 }
5241         }
5242         /*
5243          * now we know the new TSN is more advanced, let's find the actual
5244          * gap
5245          */
5246         if ((compare_with_wrap(new_cum_tsn, asoc->mapping_array_base_tsn,
5247             MAX_TSN)) ||
5248             (new_cum_tsn == asoc->mapping_array_base_tsn)) {
5249                 gap = new_cum_tsn - asoc->mapping_array_base_tsn;
5250         } else {
5251                 /* try to prevent underflow here */
5252                 gap = new_cum_tsn + (MAX_TSN - asoc->mapping_array_base_tsn) + 1;
5253         }
5254
5255         if (gap > m_size) {
5256                 asoc->highest_tsn_inside_map = back_out_htsn;
5257                 if ((long)gap > sctp_sbspace(&stcb->asoc, &stcb->sctp_socket->so_rcv)) {
5258                         struct mbuf *oper;
5259
5260                         /*
5261                          * out of range (of single byte chunks in the rwnd I
5262                          * give out). This must be an attacker.
5263                          */
5264                         *abort_flag = 1;
5265                         oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
5266                             0, M_DONTWAIT, 1, MT_DATA);
5267                         if (oper) {
5268                                 struct sctp_paramhdr *ph;
5269                                 uint32_t *ippp;
5270
5271                                 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
5272                                     (sizeof(uint32_t) * 3);
5273                                 ph = mtod(oper, struct sctp_paramhdr *);
5274                                 ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5275                                 ph->param_length = htons(SCTP_BUF_LEN(oper));
5276                                 ippp = (uint32_t *) (ph + 1);
5277                                 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_33);
5278                                 ippp++;
5279                                 *ippp = asoc->highest_tsn_inside_map;
5280                                 ippp++;
5281                                 *ippp = new_cum_tsn;
5282                         }
5283                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_33;
5284                         sctp_abort_an_association(stcb->sctp_ep, stcb,
5285                             SCTP_PEER_FAULTY, oper);
5286                         return;
5287                 }
5288                 if (asoc->highest_tsn_inside_map >
5289                     asoc->mapping_array_base_tsn) {
5290                         gap = asoc->highest_tsn_inside_map -
5291                             asoc->mapping_array_base_tsn;
5292                 } else {
5293                         gap = asoc->highest_tsn_inside_map +
5294                             (MAX_TSN - asoc->mapping_array_base_tsn) + 1;
5295                 }
5296                 SCTP_STAT_INCR(sctps_fwdtsn_map_over);
5297                 cumack_set_flag = 1;
5298         }
5299         SCTP_TCB_LOCK_ASSERT(stcb);
5300         for (i = 0; i <= gap; i++) {
5301                 SCTP_SET_TSN_PRESENT(asoc->mapping_array, i);
5302         }
5303         /*
5304          * Now after marking all, slide thing forward but no sack please.
5305          */
5306         sctp_sack_check(stcb, 0, 0, abort_flag);
5307         if (*abort_flag)
5308                 return;
5309
5310         if (cumack_set_flag) {
5311                 /*
5312                  * fwd-tsn went outside my gap array - not a common
5313                  * occurance. Do the same thing we do when a cookie-echo
5314                  * arrives.
5315                  */
5316                 asoc->highest_tsn_inside_map = new_cum_tsn - 1;
5317                 asoc->mapping_array_base_tsn = new_cum_tsn;
5318                 asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
5319                 if (sctp_logging_level & SCTP_MAP_LOGGING_ENABLE) {
5320                         sctp_log_map(0, 3, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
5321                 }
5322                 asoc->last_echo_tsn = asoc->highest_tsn_inside_map;
5323         }
5324         /*************************************************************/
5325         /* 2. Clear up re-assembly queue                             */
5326         /*************************************************************/
5327
5328         /*
5329          * First service it if pd-api is up, just in case we can progress it
5330          * forward
5331          */
5332         if (asoc->fragmented_delivery_inprogress) {
5333                 sctp_service_reassembly(stcb, asoc);
5334         }
5335         if (!TAILQ_EMPTY(&asoc->reasmqueue)) {
5336                 /* For each one on here see if we need to toss it */
5337                 /*
5338                  * For now large messages held on the reasmqueue that are
5339                  * complete will be tossed too. We could in theory do more
5340                  * work to spin through and stop after dumping one msg aka
5341                  * seeing the start of a new msg at the head, and call the
5342                  * delivery function... to see if it can be delivered... But
5343                  * for now we just dump everything on the queue.
5344                  */
5345                 chk = TAILQ_FIRST(&asoc->reasmqueue);
5346                 while (chk) {
5347                         at = TAILQ_NEXT(chk, sctp_next);
5348                         if (compare_with_wrap(asoc->cumulative_tsn,
5349                             chk->rec.data.TSN_seq, MAX_TSN) ||
5350                             asoc->cumulative_tsn == chk->rec.data.TSN_seq) {
5351                                 /* It needs to be tossed */
5352                                 TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next);
5353                                 if (compare_with_wrap(chk->rec.data.TSN_seq,
5354                                     asoc->tsn_last_delivered, MAX_TSN)) {
5355                                         asoc->tsn_last_delivered =
5356                                             chk->rec.data.TSN_seq;
5357                                         asoc->str_of_pdapi =
5358                                             chk->rec.data.stream_number;
5359                                         asoc->ssn_of_pdapi =
5360                                             chk->rec.data.stream_seq;
5361                                         asoc->fragment_flags =
5362                                             chk->rec.data.rcv_flags;
5363                                 }
5364                                 asoc->size_on_reasm_queue -= chk->send_size;
5365                                 sctp_ucount_decr(asoc->cnt_on_reasm_queue);
5366                                 cnt_gone++;
5367
5368                                 /* Clear up any stream problem */
5369                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) !=
5370                                     SCTP_DATA_UNORDERED &&
5371                                     (compare_with_wrap(chk->rec.data.stream_seq,
5372                                     asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered,
5373                                     MAX_SEQ))) {
5374                                         /*
5375                                          * We must dump forward this streams
5376                                          * sequence number if the chunk is
5377                                          * not unordered that is being
5378                                          * skipped. There is a chance that
5379                                          * if the peer does not include the
5380                                          * last fragment in its FWD-TSN we
5381                                          * WILL have a problem here since
5382                                          * you would have a partial chunk in
5383                                          * queue that may not be
5384                                          * deliverable. Also if a Partial
5385                                          * delivery API as started the user
5386                                          * may get a partial chunk. The next
5387                                          * read returning a new chunk...
5388                                          * really ugly but I see no way
5389                                          * around it! Maybe a notify??
5390                                          */
5391                                         asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered =
5392                                             chk->rec.data.stream_seq;
5393                                 }
5394                                 if (chk->data) {
5395                                         sctp_m_freem(chk->data);
5396                                         chk->data = NULL;
5397                                 }
5398                                 sctp_free_a_chunk(stcb, chk);
5399                         } else {
5400                                 /*
5401                                  * Ok we have gone beyond the end of the
5402                                  * fwd-tsn's mark. Some checks...
5403                                  */
5404                                 if ((asoc->fragmented_delivery_inprogress) &&
5405                                     (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG)) {
5406                                         uint32_t str_seq;
5407
5408                                         /*
5409                                          * Special case PD-API is up and
5410                                          * what we fwd-tsn' over includes
5411                                          * one that had the LAST_FRAG. We no
5412                                          * longer need to do the PD-API.
5413                                          */
5414                                         asoc->fragmented_delivery_inprogress = 0;
5415
5416                                         str_seq = (asoc->str_of_pdapi << 16) | asoc->ssn_of_pdapi;
5417                                         sctp_ulp_notify(SCTP_NOTIFY_PARTIAL_DELVIERY_INDICATION,
5418                                             stcb, SCTP_PARTIAL_DELIVERY_ABORTED, (void *)&str_seq);
5419
5420                                 }
5421                                 break;
5422                         }
5423                         chk = at;
5424                 }
5425         }
5426         if (asoc->fragmented_delivery_inprogress) {
5427                 /*
5428                  * Ok we removed cnt_gone chunks in the PD-API queue that
5429                  * were being delivered. So now we must turn off the flag.
5430                  */
5431                 uint32_t str_seq;
5432
5433                 str_seq = (asoc->str_of_pdapi << 16) | asoc->ssn_of_pdapi;
5434                 sctp_ulp_notify(SCTP_NOTIFY_PARTIAL_DELVIERY_INDICATION,
5435                     stcb, SCTP_PARTIAL_DELIVERY_ABORTED, (void *)&str_seq);
5436                 asoc->fragmented_delivery_inprogress = 0;
5437         }
5438         /*************************************************************/
5439         /* 3. Update the PR-stream re-ordering queues                */
5440         /*************************************************************/
5441         fwd_sz -= sizeof(*fwd);
5442         if (m && fwd_sz) {
5443                 /* New method. */
5444                 unsigned int num_str;
5445                 struct sctp_strseq *stseq, strseqbuf;
5446
5447                 offset += sizeof(*fwd);
5448
5449                 num_str = fwd_sz / sizeof(struct sctp_strseq);
5450                 for (i = 0; i < num_str; i++) {
5451                         uint16_t st;
5452                         unsigned char *xx;
5453
5454                         stseq = (struct sctp_strseq *)sctp_m_getptr(m, offset,
5455                             sizeof(struct sctp_strseq),
5456                             (uint8_t *) & strseqbuf);
5457                         offset += sizeof(struct sctp_strseq);
5458                         if (stseq == NULL)
5459                                 break;
5460                         /* Convert */
5461                         xx = (unsigned char *)&stseq[i];
5462                         st = ntohs(stseq[i].stream);
5463                         stseq[i].stream = st;
5464                         st = ntohs(stseq[i].sequence);
5465                         stseq[i].sequence = st;
5466                         /* now process */
5467                         if (stseq[i].stream >= asoc->streamincnt) {
5468                                 /*
5469                                  * It is arguable if we should continue.
5470                                  * Since the peer sent bogus stream info we
5471                                  * may be in deep trouble.. a return may be
5472                                  * a better choice?
5473                                  */
5474                                 continue;
5475                         }
5476                         strm = &asoc->strmin[stseq[i].stream];
5477                         if (compare_with_wrap(stseq[i].sequence,
5478                             strm->last_sequence_delivered, MAX_SEQ)) {
5479                                 /* Update the sequence number */
5480                                 strm->last_sequence_delivered =
5481                                     stseq[i].sequence;
5482                         }
5483                         /* now kick the stream the new way */
5484                         sctp_kick_prsctp_reorder_queue(stcb, strm);
5485                 }
5486         }
5487         if (TAILQ_FIRST(&asoc->reasmqueue)) {
5488                 /* now lets kick out and check for more fragmented delivery */
5489                 sctp_deliver_reasm_check(stcb, &stcb->asoc);
5490         }
5491 }