sys/netinet/sctp_pcb.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   5  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   6  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *
  11  * a) Redistributions of source code must retain the above copyright notice,
  12  *    this list of conditions and the following disclaimer.
  13  *
  14  * b) Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the distribution.
  17  *
  18  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  19  *    contributors may be used to endorse or promote products derived
  20  *    from this software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  24  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  26  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  32  * THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>
  36 __FBSDID("$FreeBSD$");
  37
  38 #include <netinet/sctp_os.h>
  39 #include <sys/proc.h>
  40 #include <netinet/sctp_var.h>
  41 #include <netinet/sctp_sysctl.h>
  42 #include <netinet/sctp_pcb.h>
  43 #include <netinet/sctputil.h>
  44 #include <netinet/sctp.h>
  45 #include <netinet/sctp_header.h>
  46 #include <netinet/sctp_asconf.h>
  47 #include <netinet/sctp_output.h>
  48 #include <netinet/sctp_timer.h>
  49 #include <netinet/sctp_bsd_addr.h>
  50 #if defined(INET) || defined(INET6)
  51 #include <netinet/udp.h>
  52 #endif
  53 #ifdef INET6
  54 #include <netinet6/ip6_var.h>
  55 #endif
  56 #include <sys/sched.h>
  57 #include <sys/smp.h>
  58 #include <sys/unistd.h>
  59
  60 /* FIX: we don't handle multiple link local scopes */
  61 /* "scopeless" replacement IN6_ARE_ADDR_EQUAL */
  62 #ifdef INET6
  63 int
  64 SCTP6_ARE_ADDR_EQUAL(struct sockaddr_in6 *a, struct sockaddr_in6 *b)
  65 {
  66         struct sockaddr_in6 tmp_a, tmp_b;
  67
  68         memcpy(&tmp_a, a, sizeof(struct sockaddr_in6));
  69         if (sa6_embedscope(&tmp_a, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
  70                 return (0);
  71         }
  72         memcpy(&tmp_b, b, sizeof(struct sockaddr_in6));
  73         if (sa6_embedscope(&tmp_b, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
  74                 return (0);
  75         }
  76         return (IN6_ARE_ADDR_EQUAL(&tmp_a.sin6_addr, &tmp_b.sin6_addr));
  77 }
  78 #endif
  79
  80 void
  81 sctp_fill_pcbinfo(struct sctp_pcbinfo *spcb)
  82 {
  83         /*
  84          * We really don't need to lock this, but I will just because it
  85          * does not hurt.
  86          */
  87         SCTP_INP_INFO_RLOCK();
  88         spcb->ep_count = SCTP_BASE_INFO(ipi_count_ep);
  89         spcb->asoc_count = SCTP_BASE_INFO(ipi_count_asoc);
  90         spcb->laddr_count = SCTP_BASE_INFO(ipi_count_laddr);
  91         spcb->raddr_count = SCTP_BASE_INFO(ipi_count_raddr);
  92         spcb->chk_count = SCTP_BASE_INFO(ipi_count_chunk);
  93         spcb->readq_count = SCTP_BASE_INFO(ipi_count_readq);
  94         spcb->stream_oque = SCTP_BASE_INFO(ipi_count_strmoq);
  95         spcb->free_chunks = SCTP_BASE_INFO(ipi_free_chunks);
  96         SCTP_INP_INFO_RUNLOCK();
  97 }
  98
  99 /*-
 100  * Addresses are added to VRF's (Virtual Router's). For BSD we
 101  * have only the default VRF 0. We maintain a hash list of
 102  * VRF's. Each VRF has its own list of sctp_ifn's. Each of
 103  * these has a list of addresses. When we add a new address
 104  * to a VRF we lookup the ifn/ifn_index, if the ifn does
 105  * not exist we create it and add it to the list of IFN's
 106  * within the VRF. Once we have the sctp_ifn, we add the
 107  * address to the list. So we look something like:
 108  *
 109  * hash-vrf-table
 110  *   vrf-> ifn-> ifn -> ifn
 111  *   vrf    |
 112  *    ...   +--ifa-> ifa -> ifa
 113  *   vrf
 114  *
 115  * We keep these separate lists since the SCTP subsystem will
 116  * point to these from its source address selection nets structure.
 117  * When an address is deleted it does not happen right away on
 118  * the SCTP side, it gets scheduled. What we do when a
 119  * delete happens is immediately remove the address from
 120  * the master list and decrement the refcount. As our
 121  * addip iterator works through and frees the src address
 122  * selection pointing to the sctp_ifa, eventually the refcount
 123  * will reach 0 and we will delete it. Note that it is assumed
 124  * that any locking on system level ifn/ifa is done at the
 125  * caller of these functions and these routines will only
 126  * lock the SCTP structures as they add or delete things.
 127  *
 128  * Other notes on VRF concepts.
 129  *  - An endpoint can be in multiple VRF's
 130  *  - An association lives within a VRF and only one VRF.
 131  *  - Any incoming packet we can deduce the VRF for by
 132  *    looking at the mbuf/pak inbound (for BSD its VRF=0 :D)
 133  *  - Any downward send call or connect call must supply the
 134  *    VRF via ancillary data or via some sort of set default
 135  *    VRF socket option call (again for BSD no brainer since
 136  *    the VRF is always 0).
 137  *  - An endpoint may add multiple VRF's to it.
 138  *  - Listening sockets can accept associations in any
 139  *    of the VRF's they are in but the assoc will end up
 140  *    in only one VRF (gotten from the packet or connect/send).
 141  *
 142  */
 143
 144 struct sctp_vrf *
 145 sctp_allocate_vrf(int vrf_id)
 146 {
 147         struct sctp_vrf *vrf = NULL;
 148         struct sctp_vrflist *bucket;
 149
 150         /* First allocate the VRF structure */
 151         vrf = sctp_find_vrf(vrf_id);
 152         if (vrf) {
 153                 /* Already allocated */
 154                 return (vrf);
 155         }
 156         SCTP_MALLOC(vrf, struct sctp_vrf *, sizeof(struct sctp_vrf),
 157             SCTP_M_VRF);
 158         if (vrf == NULL) {
 159                 /* No memory */
 160 #ifdef INVARIANTS
 161                 panic("No memory for VRF:%d", vrf_id);
 162 #endif
 163                 return (NULL);
 164         }
 165         /* setup the VRF */
 166         memset(vrf, 0, sizeof(struct sctp_vrf));
 167         vrf->vrf_id = vrf_id;
 168         LIST_INIT(&vrf->ifnlist);
 169         vrf->total_ifa_count = 0;
 170         vrf->refcount = 0;
 171         /* now also setup table ids */
 172         SCTP_INIT_VRF_TABLEID(vrf);
 173         /* Init the HASH of addresses */
 174         vrf->vrf_addr_hash = SCTP_HASH_INIT(SCTP_VRF_ADDR_HASH_SIZE,
 175             &vrf->vrf_addr_hashmark);
 176         if (vrf->vrf_addr_hash == NULL) {
 177                 /* No memory */
 178 #ifdef INVARIANTS
 179                 panic("No memory for VRF:%d", vrf_id);
 180 #endif
 181                 SCTP_FREE(vrf, SCTP_M_VRF);
 182                 return (NULL);
 183         }
 184
 185         /* Add it to the hash table */
 186         bucket = &SCTP_BASE_INFO(sctp_vrfhash)[(vrf_id & SCTP_BASE_INFO(hashvrfmark))];
 187         LIST_INSERT_HEAD(bucket, vrf, next_vrf);
 188         atomic_add_int(&SCTP_BASE_INFO(ipi_count_vrfs), 1);
 189         return (vrf);
 190 }
 191
 192 struct sctp_ifn *
 193 sctp_find_ifn(void *ifn, uint32_t ifn_index)
 194 {
 195         struct sctp_ifn *sctp_ifnp;
 196         struct sctp_ifnlist *hash_ifn_head;
 197
 198         /*
 199          * We assume the lock is held for the addresses if that's wrong
 200          * problems could occur :-)
 201          */
 202         SCTP_IPI_ADDR_LOCK_ASSERT();
 203         hash_ifn_head = &SCTP_BASE_INFO(vrf_ifn_hash)[(ifn_index & SCTP_BASE_INFO(vrf_ifn_hashmark))];
 204         LIST_FOREACH(sctp_ifnp, hash_ifn_head, next_bucket) {
 205                 if (sctp_ifnp->ifn_index == ifn_index) {
 206                         return (sctp_ifnp);
 207                 }
 208                 if (sctp_ifnp->ifn_p && ifn && (sctp_ifnp->ifn_p == ifn)) {
 209                         return (sctp_ifnp);
 210                 }
 211         }
 212         return (NULL);
 213 }
 214
 215 struct sctp_vrf *
 216 sctp_find_vrf(uint32_t vrf_id)
 217 {
 218         struct sctp_vrflist *bucket;
 219         struct sctp_vrf *liste;
 220
 221         bucket = &SCTP_BASE_INFO(sctp_vrfhash)[(vrf_id & SCTP_BASE_INFO(hashvrfmark))];
 222         LIST_FOREACH(liste, bucket, next_vrf) {
 223                 if (vrf_id == liste->vrf_id) {
 224                         return (liste);
 225                 }
 226         }
 227         return (NULL);
 228 }
 229
 230 void
 231 sctp_free_vrf(struct sctp_vrf *vrf)
 232 {
 233         if (SCTP_DECREMENT_AND_CHECK_REFCOUNT(&vrf->refcount)) {
 234                 if (vrf->vrf_addr_hash) {
 235                         SCTP_HASH_FREE(vrf->vrf_addr_hash, vrf->vrf_addr_hashmark);
 236                         vrf->vrf_addr_hash = NULL;
 237                 }
 238                 /* We zero'd the count */
 239                 LIST_REMOVE(vrf, next_vrf);
 240                 SCTP_FREE(vrf, SCTP_M_VRF);
 241                 atomic_subtract_int(&SCTP_BASE_INFO(ipi_count_vrfs), 1);
 242         }
 243 }
 244
 245 void
 246 sctp_free_ifn(struct sctp_ifn *sctp_ifnp)
 247 {
 248         if (SCTP_DECREMENT_AND_CHECK_REFCOUNT(&sctp_ifnp->refcount)) {
 249                 /* We zero'd the count */
 250                 if (sctp_ifnp->vrf) {
 251                         sctp_free_vrf(sctp_ifnp->vrf);
 252                 }
 253                 SCTP_FREE(sctp_ifnp, SCTP_M_IFN);
 254                 atomic_subtract_int(&SCTP_BASE_INFO(ipi_count_ifns), 1);
 255         }
 256 }
 257
 258 void
 259 sctp_update_ifn_mtu(uint32_t ifn_index, uint32_t mtu)
 260 {
 261         struct sctp_ifn *sctp_ifnp;
 262
 263         sctp_ifnp = sctp_find_ifn((void *)NULL, ifn_index);
 264         if (sctp_ifnp != NULL) {
 265                 sctp_ifnp->ifn_mtu = mtu;
 266         }
 267 }
 268
 269 void
 270 sctp_free_ifa(struct sctp_ifa *sctp_ifap)
 271 {
 272         if (SCTP_DECREMENT_AND_CHECK_REFCOUNT(&sctp_ifap->refcount)) {
 273                 /* We zero'd the count */
 274                 if (sctp_ifap->ifn_p) {
 275                         sctp_free_ifn(sctp_ifap->ifn_p);
 276                 }
 277                 SCTP_FREE(sctp_ifap, SCTP_M_IFA);
 278                 atomic_subtract_int(&SCTP_BASE_INFO(ipi_count_ifas), 1);
 279         }
 280 }
 281
 282 static void
 283 sctp_delete_ifn(struct sctp_ifn *sctp_ifnp, int hold_addr_lock)
 284 {
 285         struct sctp_ifn *found;
 286
 287         found = sctp_find_ifn(sctp_ifnp->ifn_p, sctp_ifnp->ifn_index);
 288         if (found == NULL) {
 289                 /* Not in the list.. sorry */
 290                 return;
 291         }
 292         if (hold_addr_lock == 0) {
 293                 SCTP_IPI_ADDR_WLOCK();
 294         } else {
 295                 SCTP_IPI_ADDR_WLOCK_ASSERT();
 296         }
 297         LIST_REMOVE(sctp_ifnp, next_bucket);
 298         LIST_REMOVE(sctp_ifnp, next_ifn);
 299         if (hold_addr_lock == 0) {
 300                 SCTP_IPI_ADDR_WUNLOCK();
 301         }
 302         /* Take away the reference, and possibly free it */
 303         sctp_free_ifn(sctp_ifnp);
 304 }
 305
 306 void
 307 sctp_mark_ifa_addr_down(uint32_t vrf_id, struct sockaddr *addr,
 308     const char *if_name, uint32_t ifn_index)
 309 {
 310         struct sctp_vrf *vrf;
 311         struct sctp_ifa *sctp_ifap;
 312
 313         SCTP_IPI_ADDR_RLOCK();
 314         vrf = sctp_find_vrf(vrf_id);
 315         if (vrf == NULL) {
 316                 SCTPDBG(SCTP_DEBUG_PCB4, "Can't find vrf_id 0x%x\n", vrf_id);
 317                 goto out;
 318         }
 319         sctp_ifap = sctp_find_ifa_by_addr(addr, vrf->vrf_id, SCTP_ADDR_LOCKED);
 320         if (sctp_ifap == NULL) {
 321                 SCTPDBG(SCTP_DEBUG_PCB4, "Can't find sctp_ifap for address\n");
 322                 goto out;
 323         }
 324         if (sctp_ifap->ifn_p == NULL) {
 325                 SCTPDBG(SCTP_DEBUG_PCB4, "IFA has no IFN - can't mark unusable\n");
 326                 goto out;
 327         }
 328         if (if_name) {
 329                 if (strncmp(if_name, sctp_ifap->ifn_p->ifn_name, SCTP_IFNAMSIZ) != 0) {
 330                         SCTPDBG(SCTP_DEBUG_PCB4, "IFN %s of IFA not the same as %s\n",
 331                             sctp_ifap->ifn_p->ifn_name, if_name);
 332                         goto out;
 333                 }
 334         } else {
 335                 if (sctp_ifap->ifn_p->ifn_index != ifn_index) {
 336                         SCTPDBG(SCTP_DEBUG_PCB4, "IFA owned by ifn_index:%d down command for ifn_index:%d - ignored\n",
 337                             sctp_ifap->ifn_p->ifn_index, ifn_index);
 338                         goto out;
 339                 }
 340         }
 341
 342         sctp_ifap->localifa_flags &= (~SCTP_ADDR_VALID);
 343         sctp_ifap->localifa_flags |= SCTP_ADDR_IFA_UNUSEABLE;
 344 out:
 345         SCTP_IPI_ADDR_RUNLOCK();
 346 }
 347
 348 void
 349 sctp_mark_ifa_addr_up(uint32_t vrf_id, struct sockaddr *addr,
 350     const char *if_name, uint32_t ifn_index)
 351 {
 352         struct sctp_vrf *vrf;
 353         struct sctp_ifa *sctp_ifap;
 354
 355         SCTP_IPI_ADDR_RLOCK();
 356         vrf = sctp_find_vrf(vrf_id);
 357         if (vrf == NULL) {
 358                 SCTPDBG(SCTP_DEBUG_PCB4, "Can't find vrf_id 0x%x\n", vrf_id);
 359                 goto out;
 360         }
 361         sctp_ifap = sctp_find_ifa_by_addr(addr, vrf->vrf_id, SCTP_ADDR_LOCKED);
 362         if (sctp_ifap == NULL) {
 363                 SCTPDBG(SCTP_DEBUG_PCB4, "Can't find sctp_ifap for address\n");
 364                 goto out;
 365         }
 366         if (sctp_ifap->ifn_p == NULL) {
 367                 SCTPDBG(SCTP_DEBUG_PCB4, "IFA has no IFN - can't mark unusable\n");
 368                 goto out;
 369         }
 370         if (if_name) {
 371                 if (strncmp(if_name, sctp_ifap->ifn_p->ifn_name, SCTP_IFNAMSIZ) != 0) {
 372                         SCTPDBG(SCTP_DEBUG_PCB4, "IFN %s of IFA not the same as %s\n",
 373                             sctp_ifap->ifn_p->ifn_name, if_name);
 374                         goto out;
 375                 }
 376         } else {
 377                 if (sctp_ifap->ifn_p->ifn_index != ifn_index) {
 378                         SCTPDBG(SCTP_DEBUG_PCB4, "IFA owned by ifn_index:%d down command for ifn_index:%d - ignored\n",
 379                             sctp_ifap->ifn_p->ifn_index, ifn_index);
 380                         goto out;
 381                 }
 382         }
 383
 384         sctp_ifap->localifa_flags &= (~SCTP_ADDR_IFA_UNUSEABLE);
 385         sctp_ifap->localifa_flags |= SCTP_ADDR_VALID;
 386 out:
 387         SCTP_IPI_ADDR_RUNLOCK();
 388 }
 389
 390 /*-
 391  * Add an ifa to an ifn.
 392  * Register the interface as necessary.
 393  * NOTE: ADDR write lock MUST be held.
 394  */
 395 static void
 396 sctp_add_ifa_to_ifn(struct sctp_ifn *sctp_ifnp, struct sctp_ifa *sctp_ifap)
 397 {
 398         int ifa_af;
 399
 400         LIST_INSERT_HEAD(&sctp_ifnp->ifalist, sctp_ifap, next_ifa);
 401         sctp_ifap->ifn_p = sctp_ifnp;
 402         atomic_add_int(&sctp_ifap->ifn_p->refcount, 1);
 403         /* update address counts */
 404         sctp_ifnp->ifa_count++;
 405         ifa_af = sctp_ifap->address.sa.sa_family;
 406         switch (ifa_af) {
 407 #ifdef INET
 408         case AF_INET:
 409                 sctp_ifnp->num_v4++;
 410                 break;
 411 #endif
 412 #ifdef INET6
 413         case AF_INET6:
 414                 sctp_ifnp->num_v6++;
 415                 break;
 416 #endif
 417         default:
 418                 break;
 419         }
 420         if (sctp_ifnp->ifa_count == 1) {
 421                 /* register the new interface */
 422                 sctp_ifnp->registered_af = ifa_af;
 423         }
 424 }
 425
 426 /*-
 427  * Remove an ifa from its ifn.
 428  * If no more addresses exist, remove the ifn too. Otherwise, re-register
 429  * the interface based on the remaining address families left.
 430  * NOTE: ADDR write lock MUST be held.
 431  */
 432 static void
 433 sctp_remove_ifa_from_ifn(struct sctp_ifa *sctp_ifap)
 434 {
 435         LIST_REMOVE(sctp_ifap, next_ifa);
 436         if (sctp_ifap->ifn_p) {
 437                 /* update address counts */
 438                 sctp_ifap->ifn_p->ifa_count--;
 439                 switch (sctp_ifap->address.sa.sa_family) {
 440 #ifdef INET
 441                 case AF_INET:
 442                         sctp_ifap->ifn_p->num_v4--;
 443                         break;
 444 #endif
 445 #ifdef INET6
 446                 case AF_INET6:
 447                         sctp_ifap->ifn_p->num_v6--;
 448                         break;
 449 #endif
 450                 default:
 451                         break;
 452                 }
 453
 454                 if (LIST_EMPTY(&sctp_ifap->ifn_p->ifalist)) {
 455                         /* remove the ifn, possibly freeing it */
 456                         sctp_delete_ifn(sctp_ifap->ifn_p, SCTP_ADDR_LOCKED);
 457                 } else {
 458                         /* re-register address family type, if needed */
 459                         if ((sctp_ifap->ifn_p->num_v6 == 0) &&
 460                             (sctp_ifap->ifn_p->registered_af == AF_INET6)) {
 461                                 sctp_ifap->ifn_p->registered_af = AF_INET;
 462                         } else if ((sctp_ifap->ifn_p->num_v4 == 0) &&
 463                             (sctp_ifap->ifn_p->registered_af == AF_INET)) {
 464                                 sctp_ifap->ifn_p->registered_af = AF_INET6;
 465                         }
 466                         /* free the ifn refcount */
 467                         sctp_free_ifn(sctp_ifap->ifn_p);
 468                 }
 469                 sctp_ifap->ifn_p = NULL;
 470         }
 471 }
 472
 473 struct sctp_ifa *
 474 sctp_add_addr_to_vrf(uint32_t vrf_id, void *ifn, uint32_t ifn_index,
 475     uint32_t ifn_type, const char *if_name, void *ifa,
 476     struct sockaddr *addr, uint32_t ifa_flags,
 477     int dynamic_add)
 478 {
 479         struct sctp_vrf *vrf;
 480         struct sctp_ifn *sctp_ifnp, *new_sctp_ifnp;
 481         struct sctp_ifa *sctp_ifap, *new_sctp_ifap;
 482         struct sctp_ifalist *hash_addr_head;
 483         struct sctp_ifnlist *hash_ifn_head;
 484         uint32_t hash_of_addr;
 485         int new_ifn_af = 0;
 486
 487 #ifdef SCTP_DEBUG
 488         SCTPDBG(SCTP_DEBUG_PCB4, "vrf_id 0x%x: adding address: ", vrf_id);
 489         SCTPDBG_ADDR(SCTP_DEBUG_PCB4, addr);
 490 #endif
 491         SCTP_MALLOC(new_sctp_ifnp, struct sctp_ifn *,
 492             sizeof(struct sctp_ifn), SCTP_M_IFN);
 493         if (new_sctp_ifnp == NULL) {
 494 #ifdef INVARIANTS
 495                 panic("No memory for IFN");
 496 #endif
 497                 return (NULL);
 498         }
 499         SCTP_MALLOC(new_sctp_ifap, struct sctp_ifa *, sizeof(struct sctp_ifa), SCTP_M_IFA);
 500         if (new_sctp_ifap == NULL) {
 501 #ifdef INVARIANTS
 502                 panic("No memory for IFA");
 503 #endif
 504                 SCTP_FREE(new_sctp_ifnp, SCTP_M_IFN);
 505                 return (NULL);
 506         }
 507
 508         SCTP_IPI_ADDR_WLOCK();
 509         sctp_ifnp = sctp_find_ifn(ifn, ifn_index);
 510         if (sctp_ifnp) {
 511                 vrf = sctp_ifnp->vrf;
 512         } else {
 513                 vrf = sctp_find_vrf(vrf_id);
 514                 if (vrf == NULL) {
 515                         vrf = sctp_allocate_vrf(vrf_id);
 516                         if (vrf == NULL) {
 517                                 SCTP_IPI_ADDR_WUNLOCK();
 518                                 SCTP_FREE(new_sctp_ifnp, SCTP_M_IFN);
 519                                 SCTP_FREE(new_sctp_ifap, SCTP_M_IFA);
 520                                 return (NULL);
 521                         }
 522                 }
 523         }
 524         if (sctp_ifnp == NULL) {
 525                 /*
 526                  * build one and add it, can't hold lock until after malloc
 527                  * done though.
 528                  */
 529                 sctp_ifnp = new_sctp_ifnp;
 530                 new_sctp_ifnp = NULL;
 531                 memset(sctp_ifnp, 0, sizeof(struct sctp_ifn));
 532                 sctp_ifnp->ifn_index = ifn_index;
 533                 sctp_ifnp->ifn_p = ifn;
 534                 sctp_ifnp->ifn_type = ifn_type;
 535                 sctp_ifnp->refcount = 0;
 536                 sctp_ifnp->vrf = vrf;
 537                 atomic_add_int(&vrf->refcount, 1);
 538                 sctp_ifnp->ifn_mtu = SCTP_GATHER_MTU_FROM_IFN_INFO(ifn, ifn_index, addr->sa_family);
 539                 if (if_name != NULL) {
 540                         SCTP_SNPRINTF(sctp_ifnp->ifn_name, SCTP_IFNAMSIZ, "%s", if_name);
 541                 } else {
 542                         SCTP_SNPRINTF(sctp_ifnp->ifn_name, SCTP_IFNAMSIZ, "%s", "unknown");
 543                 }
 544                 hash_ifn_head = &SCTP_BASE_INFO(vrf_ifn_hash)[(ifn_index & SCTP_BASE_INFO(vrf_ifn_hashmark))];
 545                 LIST_INIT(&sctp_ifnp->ifalist);
 546                 LIST_INSERT_HEAD(hash_ifn_head, sctp_ifnp, next_bucket);
 547                 LIST_INSERT_HEAD(&vrf->ifnlist, sctp_ifnp, next_ifn);
 548                 atomic_add_int(&SCTP_BASE_INFO(ipi_count_ifns), 1);
 549                 new_ifn_af = 1;
 550         }
 551         sctp_ifap = sctp_find_ifa_by_addr(addr, vrf->vrf_id, SCTP_ADDR_LOCKED);
 552         if (sctp_ifap) {
 553                 /* Hmm, it already exists? */
 554                 if ((sctp_ifap->ifn_p) &&
 555                     (sctp_ifap->ifn_p->ifn_index == ifn_index)) {
 556                         SCTPDBG(SCTP_DEBUG_PCB4, "Using existing ifn %s (0x%x) for ifa %p\n",
 557                             sctp_ifap->ifn_p->ifn_name, ifn_index,
 558                             (void *)sctp_ifap);
 559                         if (new_ifn_af) {
 560                                 /* Remove the created one that we don't want */
 561                                 sctp_delete_ifn(sctp_ifnp, SCTP_ADDR_LOCKED);
 562                         }
 563                         if (sctp_ifap->localifa_flags & SCTP_BEING_DELETED) {
 564                                 /* easy to solve, just switch back to active */
 565                                 SCTPDBG(SCTP_DEBUG_PCB4, "Clearing deleted ifa flag\n");
 566                                 sctp_ifap->localifa_flags = SCTP_ADDR_VALID;
 567                                 sctp_ifap->ifn_p = sctp_ifnp;
 568                                 atomic_add_int(&sctp_ifap->ifn_p->refcount, 1);
 569                         }
 570         exit_stage_left:
 571                         SCTP_IPI_ADDR_WUNLOCK();
 572                         if (new_sctp_ifnp != NULL) {
 573                                 SCTP_FREE(new_sctp_ifnp, SCTP_M_IFN);
 574                         }
 575                         SCTP_FREE(new_sctp_ifap, SCTP_M_IFA);
 576                         return (sctp_ifap);
 577                 } else {
 578                         if (sctp_ifap->ifn_p) {
 579                                 /*
 580                                  * The last IFN gets the address, remove the
 581                                  * old one
 582                                  */
 583                                 SCTPDBG(SCTP_DEBUG_PCB4, "Moving ifa %p from %s (0x%x) to %s (0x%x)\n",
 584                                     (void *)sctp_ifap, sctp_ifap->ifn_p->ifn_name,
 585                                     sctp_ifap->ifn_p->ifn_index, if_name,
 586                                     ifn_index);
 587                                 /* remove the address from the old ifn */
 588                                 sctp_remove_ifa_from_ifn(sctp_ifap);
 589                                 /* move the address over to the new ifn */
 590                                 sctp_add_ifa_to_ifn(sctp_ifnp, sctp_ifap);
 591                                 goto exit_stage_left;
 592                         } else {
 593                                 /* repair ifnp which was NULL ? */
 594                                 sctp_ifap->localifa_flags = SCTP_ADDR_VALID;
 595                                 SCTPDBG(SCTP_DEBUG_PCB4, "Repairing ifn %p for ifa %p\n",
 596                                     (void *)sctp_ifnp, (void *)sctp_ifap);
 597                                 sctp_add_ifa_to_ifn(sctp_ifnp, sctp_ifap);
 598                         }
 599                         goto exit_stage_left;
 600                 }
 601         }
 602         sctp_ifap = new_sctp_ifap;
 603         memset(sctp_ifap, 0, sizeof(struct sctp_ifa));
 604         sctp_ifap->ifn_p = sctp_ifnp;
 605         atomic_add_int(&sctp_ifnp->refcount, 1);
 606         sctp_ifap->vrf_id = vrf_id;
 607         sctp_ifap->ifa = ifa;
 608         memcpy(&sctp_ifap->address, addr, addr->sa_len);
 609         sctp_ifap->localifa_flags = SCTP_ADDR_VALID | SCTP_ADDR_DEFER_USE;
 610         sctp_ifap->flags = ifa_flags;
 611         /* Set scope */
 612         switch (sctp_ifap->address.sa.sa_family) {
 613 #ifdef INET
 614         case AF_INET:
 615                 {
 616                         struct sockaddr_in *sin;
 617
 618                         sin = &sctp_ifap->address.sin;
 619                         if (SCTP_IFN_IS_IFT_LOOP(sctp_ifap->ifn_p) ||
 620                             (IN4_ISLOOPBACK_ADDRESS(&sin->sin_addr))) {
 621                                 sctp_ifap->src_is_loop = 1;
 622                         }
 623                         if ((IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
 624                                 sctp_ifap->src_is_priv = 1;
 625                         }
 626                         sctp_ifnp->num_v4++;
 627                         if (new_ifn_af)
 628                                 new_ifn_af = AF_INET;
 629                         break;
 630                 }
 631 #endif
 632 #ifdef INET6
 633         case AF_INET6:
 634                 {
 635                         /* ok to use deprecated addresses? */
 636                         struct sockaddr_in6 *sin6;
 637
 638                         sin6 = &sctp_ifap->address.sin6;
 639                         if (SCTP_IFN_IS_IFT_LOOP(sctp_ifap->ifn_p) ||
 640                             (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr))) {
 641                                 sctp_ifap->src_is_loop = 1;
 642                         }
 643                         if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
 644                                 sctp_ifap->src_is_priv = 1;
 645                         }
 646                         sctp_ifnp->num_v6++;
 647                         if (new_ifn_af)
 648                                 new_ifn_af = AF_INET6;
 649                         break;
 650                 }
 651 #endif
 652         default:
 653                 new_ifn_af = 0;
 654                 break;
 655         }
 656         hash_of_addr = sctp_get_ifa_hash_val(&sctp_ifap->address.sa);
 657
 658         if ((sctp_ifap->src_is_priv == 0) &&
 659             (sctp_ifap->src_is_loop == 0)) {
 660                 sctp_ifap->src_is_glob = 1;
 661         }
 662         hash_addr_head = &vrf->vrf_addr_hash[(hash_of_addr & vrf->vrf_addr_hashmark)];
 663         LIST_INSERT_HEAD(hash_addr_head, sctp_ifap, next_bucket);
 664         sctp_ifap->refcount = 1;
 665         LIST_INSERT_HEAD(&sctp_ifnp->ifalist, sctp_ifap, next_ifa);
 666         sctp_ifnp->ifa_count++;
 667         vrf->total_ifa_count++;
 668         atomic_add_int(&SCTP_BASE_INFO(ipi_count_ifas), 1);
 669         if (new_ifn_af) {
 670                 sctp_ifnp->registered_af = new_ifn_af;
 671         }
 672         SCTP_IPI_ADDR_WUNLOCK();
 673         if (new_sctp_ifnp != NULL) {
 674                 SCTP_FREE(new_sctp_ifnp, SCTP_M_IFN);
 675         }
 676
 677         if (dynamic_add) {
 678                 /*
 679                  * Bump up the refcount so that when the timer completes it
 680                  * will drop back down.
 681                  */
 682                 struct sctp_laddr *wi;
 683
 684                 atomic_add_int(&sctp_ifap->refcount, 1);
 685                 wi = SCTP_ZONE_GET(SCTP_BASE_INFO(ipi_zone_laddr), struct sctp_laddr);
 686                 if (wi == NULL) {
 687                         /*
 688                          * Gak, what can we do? We have lost an address
 689                          * change can you say HOSED?
 690                          */
 691                         SCTPDBG(SCTP_DEBUG_PCB4, "Lost an address change?\n");
 692                         /* Opps, must decrement the count */
 693                         sctp_del_addr_from_vrf(vrf_id, addr, ifn_index,
 694                             if_name);
 695                         return (NULL);
 696                 }
 697                 SCTP_INCR_LADDR_COUNT();
 698                 memset(wi, 0, sizeof(*wi));
 699                 (void)SCTP_GETTIME_TIMEVAL(&wi->start_time);
 700                 wi->ifa = sctp_ifap;
 701                 wi->action = SCTP_ADD_IP_ADDRESS;
 702
 703                 SCTP_WQ_ADDR_LOCK();
 704                 LIST_INSERT_HEAD(&SCTP_BASE_INFO(addr_wq), wi, sctp_nxt_addr);
 705                 sctp_timer_start(SCTP_TIMER_TYPE_ADDR_WQ,
 706                     (struct sctp_inpcb *)NULL,
 707                     (struct sctp_tcb *)NULL,
 708                     (struct sctp_nets *)NULL);
 709                 SCTP_WQ_ADDR_UNLOCK();
 710         } else {
 711                 /* it's ready for use */
 712                 sctp_ifap->localifa_flags &= ~SCTP_ADDR_DEFER_USE;
 713         }
 714         return (sctp_ifap);
 715 }
 716
 717 void
 718 sctp_del_addr_from_vrf(uint32_t vrf_id, struct sockaddr *addr,
 719     uint32_t ifn_index, const char *if_name)
 720 {
 721         struct sctp_vrf *vrf;
 722         struct sctp_ifa *sctp_ifap = NULL;
 723
 724         SCTP_IPI_ADDR_WLOCK();
 725         vrf = sctp_find_vrf(vrf_id);
 726         if (vrf == NULL) {
 727                 SCTPDBG(SCTP_DEBUG_PCB4, "Can't find vrf_id 0x%x\n", vrf_id);
 728                 goto out_now;
 729         }
 730
 731 #ifdef SCTP_DEBUG
 732         SCTPDBG(SCTP_DEBUG_PCB4, "vrf_id 0x%x: deleting address:", vrf_id);
 733         SCTPDBG_ADDR(SCTP_DEBUG_PCB4, addr);
 734 #endif
 735         sctp_ifap = sctp_find_ifa_by_addr(addr, vrf->vrf_id, SCTP_ADDR_LOCKED);
 736         if (sctp_ifap) {
 737                 /* Validate the delete */
 738                 if (sctp_ifap->ifn_p) {
 739                         int valid = 0;
 740
 741                         /*-
 742                          * The name has priority over the ifn_index
 743                          * if its given.
 744                          */
 745                         if (if_name) {
 746                                 if (strncmp(if_name, sctp_ifap->ifn_p->ifn_name, SCTP_IFNAMSIZ) == 0) {
 747                                         /* They match its a correct delete */
 748                                         valid = 1;
 749                                 }
 750                         }
 751                         if (!valid) {
 752                                 /* last ditch check ifn_index */
 753                                 if (ifn_index == sctp_ifap->ifn_p->ifn_index) {
 754                                         valid = 1;
 755                                 }
 756                         }
 757                         if (!valid) {
 758                                 SCTPDBG(SCTP_DEBUG_PCB4, "ifn:%d ifname:%s does not match addresses\n",
 759                                     ifn_index, ((if_name == NULL) ? "NULL" : if_name));
 760                                 SCTPDBG(SCTP_DEBUG_PCB4, "ifn:%d ifname:%s - ignoring delete\n",
 761                                     sctp_ifap->ifn_p->ifn_index, sctp_ifap->ifn_p->ifn_name);
 762                                 SCTP_IPI_ADDR_WUNLOCK();
 763                                 return;
 764                         }
 765                 }
 766                 SCTPDBG(SCTP_DEBUG_PCB4, "Deleting ifa %p\n", (void *)sctp_ifap);
 767                 sctp_ifap->localifa_flags &= SCTP_ADDR_VALID;
 768                 /*
 769                  * We don't set the flag. This means that the structure will
 770                  * hang around in EP's that have bound specific to it until
 771                  * they close. This gives us TCP like behavior if someone
 772                  * removes an address (or for that matter adds it right
 773                  * back).
 774                  */
 775                 /* sctp_ifap->localifa_flags |= SCTP_BEING_DELETED; */
 776                 vrf->total_ifa_count--;
 777                 LIST_REMOVE(sctp_ifap, next_bucket);
 778                 sctp_remove_ifa_from_ifn(sctp_ifap);
 779         }
 780 #ifdef SCTP_DEBUG
 781         else {
 782                 SCTPDBG(SCTP_DEBUG_PCB4, "Del Addr-ifn:%d Could not find address:",
 783                     ifn_index);
 784                 SCTPDBG_ADDR(SCTP_DEBUG_PCB1, addr);
 785         }
 786 #endif
 787
 788 out_now:
 789         SCTP_IPI_ADDR_WUNLOCK();
 790         if (sctp_ifap) {
 791                 struct sctp_laddr *wi;
 792
 793                 wi = SCTP_ZONE_GET(SCTP_BASE_INFO(ipi_zone_laddr), struct sctp_laddr);
 794                 if (wi == NULL) {
 795                         /*
 796                          * Gak, what can we do? We have lost an address
 797                          * change can you say HOSED?
 798                          */
 799                         SCTPDBG(SCTP_DEBUG_PCB4, "Lost an address change?\n");
 800
 801                         /* Oops, must decrement the count */
 802                         sctp_free_ifa(sctp_ifap);
 803                         return;
 804                 }
 805                 SCTP_INCR_LADDR_COUNT();
 806                 memset(wi, 0, sizeof(*wi));
 807                 (void)SCTP_GETTIME_TIMEVAL(&wi->start_time);
 808                 wi->ifa = sctp_ifap;
 809                 wi->action = SCTP_DEL_IP_ADDRESS;
 810                 SCTP_WQ_ADDR_LOCK();
 811                 /*
 812                  * Should this really be a tailq? As it is we will process
 813                  * the newest first :-0
 814                  */
 815                 LIST_INSERT_HEAD(&SCTP_BASE_INFO(addr_wq), wi, sctp_nxt_addr);
 816                 sctp_timer_start(SCTP_TIMER_TYPE_ADDR_WQ,
 817                     (struct sctp_inpcb *)NULL,
 818                     (struct sctp_tcb *)NULL,
 819                     (struct sctp_nets *)NULL);
 820                 SCTP_WQ_ADDR_UNLOCK();
 821         }
 822         return;
 823 }
 824
 825 static int
 826 sctp_does_stcb_own_this_addr(struct sctp_tcb *stcb, struct sockaddr *to)
 827 {
 828         int loopback_scope;
 829 #if defined(INET)
 830         int ipv4_local_scope, ipv4_addr_legal;
 831 #endif
 832 #if defined(INET6)
 833         int local_scope, site_scope, ipv6_addr_legal;
 834 #endif
 835         struct sctp_vrf *vrf;
 836         struct sctp_ifn *sctp_ifn;
 837         struct sctp_ifa *sctp_ifa;
 838
 839         loopback_scope = stcb->asoc.scope.loopback_scope;
 840 #if defined(INET)
 841         ipv4_local_scope = stcb->asoc.scope.ipv4_local_scope;
 842         ipv4_addr_legal = stcb->asoc.scope.ipv4_addr_legal;
 843 #endif
 844 #if defined(INET6)
 845         local_scope = stcb->asoc.scope.local_scope;
 846         site_scope = stcb->asoc.scope.site_scope;
 847         ipv6_addr_legal = stcb->asoc.scope.ipv6_addr_legal;
 848 #endif
 849
 850         SCTP_IPI_ADDR_RLOCK();
 851         vrf = sctp_find_vrf(stcb->asoc.vrf_id);
 852         if (vrf == NULL) {
 853                 /* no vrf, no addresses */
 854                 SCTP_IPI_ADDR_RUNLOCK();
 855                 return (0);
 856         }
 857
 858         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
 859                 LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
 860                         if ((loopback_scope == 0) &&
 861                             SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
 862                                 continue;
 863                         }
 864                         LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
 865                                 if (sctp_is_addr_restricted(stcb, sctp_ifa) &&
 866                                     (!sctp_is_addr_pending(stcb, sctp_ifa))) {
 867                                         /*
 868                                          * We allow pending addresses, where
 869                                          * we have sent an asconf-add to be
 870                                          * considered valid.
 871                                          */
 872                                         continue;
 873                                 }
 874                                 if (sctp_ifa->address.sa.sa_family != to->sa_family) {
 875                                         continue;
 876                                 }
 877                                 switch (sctp_ifa->address.sa.sa_family) {
 878 #ifdef INET
 879                                 case AF_INET:
 880                                         if (ipv4_addr_legal) {
 881                                                 struct sockaddr_in *sin,
 882                                                            *rsin;
 883
 884                                                 sin = &sctp_ifa->address.sin;
 885                                                 rsin = (struct sockaddr_in *)to;
 886                                                 if ((ipv4_local_scope == 0) &&
 887                                                     IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) {
 888                                                         continue;
 889                                                 }
 890                                                 if (prison_check_ip4(stcb->sctp_ep->ip_inp.inp.inp_cred,
 891                                                     &sin->sin_addr) != 0) {
 892                                                         continue;
 893                                                 }
 894                                                 if (sin->sin_addr.s_addr == rsin->sin_addr.s_addr) {
 895                                                         SCTP_IPI_ADDR_RUNLOCK();
 896                                                         return (1);
 897                                                 }
 898                                         }
 899                                         break;
 900 #endif
 901 #ifdef INET6
 902                                 case AF_INET6:
 903                                         if (ipv6_addr_legal) {
 904                                                 struct sockaddr_in6 *sin6,
 905                                                             *rsin6;
 906
 907                                                 sin6 = &sctp_ifa->address.sin6;
 908                                                 rsin6 = (struct sockaddr_in6 *)to;
 909                                                 if (prison_check_ip6(stcb->sctp_ep->ip_inp.inp.inp_cred,
 910                                                     &sin6->sin6_addr) != 0) {
 911                                                         continue;
 912                                                 }
 913                                                 if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
 914                                                         if (local_scope == 0)
 915                                                                 continue;
 916                                                         if (sin6->sin6_scope_id == 0) {
 917                                                                 if (sa6_recoverscope(sin6) != 0)
 918                                                                         continue;
 919                                                         }
 920                                                 }
 921                                                 if ((site_scope == 0) &&
 922                                                     (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
 923                                                         continue;
 924                                                 }
 925                                                 if (SCTP6_ARE_ADDR_EQUAL(sin6, rsin6)) {
 926                                                         SCTP_IPI_ADDR_RUNLOCK();
 927                                                         return (1);
 928                                                 }
 929                                         }
 930                                         break;
 931 #endif
 932                                 default:
 933                                         /* TSNH */
 934                                         break;
 935                                 }
 936                         }
 937                 }
 938         } else {
 939                 struct sctp_laddr *laddr;
 940
 941                 LIST_FOREACH(laddr, &stcb->sctp_ep->sctp_addr_list, sctp_nxt_addr) {
 942                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
 943                                 SCTPDBG(SCTP_DEBUG_PCB1, "ifa being deleted\n");
 944                                 continue;
 945                         }
 946                         if (sctp_is_addr_restricted(stcb, laddr->ifa) &&
 947                             (!sctp_is_addr_pending(stcb, laddr->ifa))) {
 948                                 /*
 949                                  * We allow pending addresses, where we have
 950                                  * sent an asconf-add to be considered
 951                                  * valid.
 952                                  */
 953                                 continue;
 954                         }
 955                         if (laddr->ifa->address.sa.sa_family != to->sa_family) {
 956                                 continue;
 957                         }
 958                         switch (to->sa_family) {
 959 #ifdef INET
 960                         case AF_INET:
 961                                 {
 962                                         struct sockaddr_in *sin, *rsin;
 963
 964                                         sin = &laddr->ifa->address.sin;
 965                                         rsin = (struct sockaddr_in *)to;
 966                                         if (sin->sin_addr.s_addr == rsin->sin_addr.s_addr) {
 967                                                 SCTP_IPI_ADDR_RUNLOCK();
 968                                                 return (1);
 969                                         }
 970                                         break;
 971                                 }
 972 #endif
 973 #ifdef INET6
 974                         case AF_INET6:
 975                                 {
 976                                         struct sockaddr_in6 *sin6, *rsin6;
 977
 978                                         sin6 = &laddr->ifa->address.sin6;
 979                                         rsin6 = (struct sockaddr_in6 *)to;
 980                                         if (SCTP6_ARE_ADDR_EQUAL(sin6, rsin6)) {
 981                                                 SCTP_IPI_ADDR_RUNLOCK();
 982                                                 return (1);
 983                                         }
 984                                         break;
 985                                 }
 986
 987 #endif
 988                         default:
 989                                 /* TSNH */
 990                                 break;
 991                         }
 992                 }
 993         }
 994         SCTP_IPI_ADDR_RUNLOCK();
 995         return (0);
 996 }
 997
 998 static struct sctp_tcb *
 999 sctp_tcb_special_locate(struct sctp_inpcb **inp_p, struct sockaddr *from,
1000     struct sockaddr *to, struct sctp_nets **netp, uint32_t vrf_id)
1001 {
1002         /**** ASSUMES THE CALLER holds the INP_INFO_RLOCK */
1003         /*
1004          * If we support the TCP model, then we must now dig through to see
1005          * if we can find our endpoint in the list of tcp ep's.
1006          */
1007         uint16_t lport, rport;
1008         struct sctppcbhead *ephead;
1009         struct sctp_inpcb *inp;
1010         struct sctp_laddr *laddr;
1011         struct sctp_tcb *stcb;
1012         struct sctp_nets *net;
1013
1014         if ((to == NULL) || (from == NULL)) {
1015                 return (NULL);
1016         }
1017
1018         switch (to->sa_family) {
1019 #ifdef INET
1020         case AF_INET:
1021                 if (from->sa_family == AF_INET) {
1022                         lport = ((struct sockaddr_in *)to)->sin_port;
1023                         rport = ((struct sockaddr_in *)from)->sin_port;
1024                 } else {
1025                         return (NULL);
1026                 }
1027                 break;
1028 #endif
1029 #ifdef INET6
1030         case AF_INET6:
1031                 if (from->sa_family == AF_INET6) {
1032                         lport = ((struct sockaddr_in6 *)to)->sin6_port;
1033                         rport = ((struct sockaddr_in6 *)from)->sin6_port;
1034                 } else {
1035                         return (NULL);
1036                 }
1037                 break;
1038 #endif
1039         default:
1040                 return (NULL);
1041         }
1042         ephead = &SCTP_BASE_INFO(sctp_tcpephash)[SCTP_PCBHASH_ALLADDR((lport | rport), SCTP_BASE_INFO(hashtcpmark))];
1043         /*
1044          * Ok now for each of the guys in this bucket we must look and see:
1045          * - Does the remote port match. - Does there single association's
1046          * addresses match this address (to). If so we update p_ep to point
1047          * to this ep and return the tcb from it.
1048          */
1049         LIST_FOREACH(inp, ephead, sctp_hash) {
1050                 SCTP_INP_RLOCK(inp);
1051                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) {
1052                         SCTP_INP_RUNLOCK(inp);
1053                         continue;
1054                 }
1055                 if (lport != inp->sctp_lport) {
1056                         SCTP_INP_RUNLOCK(inp);
1057                         continue;
1058                 }
1059                 switch (to->sa_family) {
1060 #ifdef INET
1061                 case AF_INET:
1062                         {
1063                                 struct sockaddr_in *sin;
1064
1065                                 sin = (struct sockaddr_in *)to;
1066                                 if (prison_check_ip4(inp->ip_inp.inp.inp_cred,
1067                                     &sin->sin_addr) != 0) {
1068                                         SCTP_INP_RUNLOCK(inp);
1069                                         continue;
1070                                 }
1071                                 break;
1072                         }
1073 #endif
1074 #ifdef INET6
1075                 case AF_INET6:
1076                         {
1077                                 struct sockaddr_in6 *sin6;
1078
1079                                 sin6 = (struct sockaddr_in6 *)to;
1080                                 if (prison_check_ip6(inp->ip_inp.inp.inp_cred,
1081                                     &sin6->sin6_addr) != 0) {
1082                                         SCTP_INP_RUNLOCK(inp);
1083                                         continue;
1084                                 }
1085                                 break;
1086                         }
1087 #endif
1088                 default:
1089                         SCTP_INP_RUNLOCK(inp);
1090                         continue;
1091                 }
1092                 if (inp->def_vrf_id != vrf_id) {
1093                         SCTP_INP_RUNLOCK(inp);
1094                         continue;
1095                 }
1096                 /* check to see if the ep has one of the addresses */
1097                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) == 0) {
1098                         /* We are NOT bound all, so look further */
1099                         int match = 0;
1100
1101                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
1102                                 if (laddr->ifa == NULL) {
1103                                         SCTPDBG(SCTP_DEBUG_PCB1, "%s: NULL ifa\n", __func__);
1104                                         continue;
1105                                 }
1106                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
1107                                         SCTPDBG(SCTP_DEBUG_PCB1, "ifa being deleted\n");
1108                                         continue;
1109                                 }
1110                                 if (laddr->ifa->address.sa.sa_family ==
1111                                     to->sa_family) {
1112                                         /* see if it matches */
1113 #ifdef INET
1114                                         if (from->sa_family == AF_INET) {
1115                                                 struct sockaddr_in *intf_addr,
1116                                                            *sin;
1117
1118                                                 intf_addr = &laddr->ifa->address.sin;
1119                                                 sin = (struct sockaddr_in *)to;
1120                                                 if (sin->sin_addr.s_addr ==
1121                                                     intf_addr->sin_addr.s_addr) {
1122                                                         match = 1;
1123                                                         break;
1124                                                 }
1125                                         }
1126 #endif
1127 #ifdef INET6
1128                                         if (from->sa_family == AF_INET6) {
1129                                                 struct sockaddr_in6 *intf_addr6;
1130                                                 struct sockaddr_in6 *sin6;
1131
1132                                                 sin6 = (struct sockaddr_in6 *)
1133                                                     to;
1134                                                 intf_addr6 = &laddr->ifa->address.sin6;
1135
1136                                                 if (SCTP6_ARE_ADDR_EQUAL(sin6,
1137                                                     intf_addr6)) {
1138                                                         match = 1;
1139                                                         break;
1140                                                 }
1141                                         }
1142 #endif
1143                                 }
1144                         }
1145                         if (match == 0) {
1146                                 /* This endpoint does not have this address */
1147                                 SCTP_INP_RUNLOCK(inp);
1148                                 continue;
1149                         }
1150                 }
1151                 /*
1152                  * Ok if we hit here the ep has the address, does it hold
1153                  * the tcb?
1154                  */
1155                 /* XXX: Why don't we TAILQ_FOREACH through sctp_asoc_list? */
1156                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
1157                 if (stcb == NULL) {
1158                         SCTP_INP_RUNLOCK(inp);
1159                         continue;
1160                 }
1161                 SCTP_TCB_LOCK(stcb);
1162                 if (!sctp_does_stcb_own_this_addr(stcb, to)) {
1163                         SCTP_TCB_UNLOCK(stcb);
1164                         SCTP_INP_RUNLOCK(inp);
1165                         continue;
1166                 }
1167                 if (stcb->rport != rport) {
1168                         /* remote port does not match. */
1169                         SCTP_TCB_UNLOCK(stcb);
1170                         SCTP_INP_RUNLOCK(inp);
1171                         continue;
1172                 }
1173                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
1174                         SCTP_TCB_UNLOCK(stcb);
1175                         SCTP_INP_RUNLOCK(inp);
1176                         continue;
1177                 }
1178                 if (!sctp_does_stcb_own_this_addr(stcb, to)) {
1179                         SCTP_TCB_UNLOCK(stcb);
1180                         SCTP_INP_RUNLOCK(inp);
1181                         continue;
1182                 }
1183                 /* Does this TCB have a matching address? */
1184                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1185                         if (net->ro._l_addr.sa.sa_family != from->sa_family) {
1186                                 /* not the same family, can't be a match */
1187                                 continue;
1188                         }
1189                         switch (from->sa_family) {
1190 #ifdef INET
1191                         case AF_INET:
1192                                 {
1193                                         struct sockaddr_in *sin, *rsin;
1194
1195                                         sin = (struct sockaddr_in *)&net->ro._l_addr;
1196                                         rsin = (struct sockaddr_in *)from;
1197                                         if (sin->sin_addr.s_addr ==
1198                                             rsin->sin_addr.s_addr) {
1199                                                 /* found it */
1200                                                 if (netp != NULL) {
1201                                                         *netp = net;
1202                                                 }
1203                                                 /*
1204                                                  * Update the endpoint
1205                                                  * pointer
1206                                                  */
1207                                                 *inp_p = inp;
1208                                                 SCTP_INP_RUNLOCK(inp);
1209                                                 return (stcb);
1210                                         }
1211                                         break;
1212                                 }
1213 #endif
1214 #ifdef INET6
1215                         case AF_INET6:
1216                                 {
1217                                         struct sockaddr_in6 *sin6, *rsin6;
1218
1219                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1220                                         rsin6 = (struct sockaddr_in6 *)from;
1221                                         if (SCTP6_ARE_ADDR_EQUAL(sin6,
1222                                             rsin6)) {
1223                                                 /* found it */
1224                                                 if (netp != NULL) {
1225                                                         *netp = net;
1226                                                 }
1227                                                 /*
1228                                                  * Update the endpoint
1229                                                  * pointer
1230                                                  */
1231                                                 *inp_p = inp;
1232                                                 SCTP_INP_RUNLOCK(inp);
1233                                                 return (stcb);
1234                                         }
1235                                         break;
1236                                 }
1237 #endif
1238                         default:
1239                                 /* TSNH */
1240                                 break;
1241                         }
1242                 }
1243                 SCTP_TCB_UNLOCK(stcb);
1244                 SCTP_INP_RUNLOCK(inp);
1245         }
1246         return (NULL);
1247 }
1248
1249 /*
1250  * rules for use
1251  *
1252  * 1) If I return a NULL you must decrement any INP ref cnt. 2) If I find an
1253  * stcb, both will be locked (locked_tcb and stcb) but decrement will be done
1254  * (if locked == NULL). 3) Decrement happens on return ONLY if locked ==
1255  * NULL.
1256  */
1257
1258 struct sctp_tcb *
1259 sctp_findassociation_ep_addr(struct sctp_inpcb **inp_p, struct sockaddr *remote,
1260     struct sctp_nets **netp, struct sockaddr *local, struct sctp_tcb *locked_tcb)
1261 {
1262         struct sctpasochead *head;
1263         struct sctp_inpcb *inp;
1264         struct sctp_tcb *stcb = NULL;
1265         struct sctp_nets *net;
1266         uint16_t rport;
1267
1268         inp = *inp_p;
1269         switch (remote->sa_family) {
1270 #ifdef INET
1271         case AF_INET:
1272                 rport = (((struct sockaddr_in *)remote)->sin_port);
1273                 break;
1274 #endif
1275 #ifdef INET6
1276         case AF_INET6:
1277                 rport = (((struct sockaddr_in6 *)remote)->sin6_port);
1278                 break;
1279 #endif
1280         default:
1281                 return (NULL);
1282         }
1283         if (locked_tcb) {
1284                 /*
1285                  * UN-lock so we can do proper locking here this occurs when
1286                  * called from load_addresses_from_init.
1287                  */
1288                 atomic_add_int(&locked_tcb->asoc.refcnt, 1);
1289                 SCTP_TCB_UNLOCK(locked_tcb);
1290         }
1291         SCTP_INP_INFO_RLOCK();
1292         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1293             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
1294                 /*-
1295                  * Now either this guy is our listener or it's the
1296                  * connector. If it is the one that issued the connect, then
1297                  * it's only chance is to be the first TCB in the list. If
1298                  * it is the acceptor, then do the special_lookup to hash
1299                  * and find the real inp.
1300                  */
1301                 if ((inp->sctp_socket) && SCTP_IS_LISTENING(inp)) {
1302                         /* to is peer addr, from is my addr */
1303                         stcb = sctp_tcb_special_locate(inp_p, remote, local,
1304                             netp, inp->def_vrf_id);
1305                         if ((stcb != NULL) && (locked_tcb == NULL)) {
1306                                 /* we have a locked tcb, lower refcount */
1307                                 SCTP_INP_DECR_REF(inp);
1308                         }
1309                         if ((locked_tcb != NULL) && (locked_tcb != stcb)) {
1310                                 SCTP_INP_RLOCK(locked_tcb->sctp_ep);
1311                                 SCTP_TCB_LOCK(locked_tcb);
1312                                 atomic_subtract_int(&locked_tcb->asoc.refcnt, 1);
1313                                 SCTP_INP_RUNLOCK(locked_tcb->sctp_ep);
1314                         }
1315                         SCTP_INP_INFO_RUNLOCK();
1316                         return (stcb);
1317                 } else {
1318                         SCTP_INP_WLOCK(inp);
1319                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) {
1320                                 goto null_return;
1321                         }
1322                         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1323                         if (stcb == NULL) {
1324                                 goto null_return;
1325                         }
1326                         SCTP_TCB_LOCK(stcb);
1327
1328                         if (stcb->rport != rport) {
1329                                 /* remote port does not match. */
1330                                 SCTP_TCB_UNLOCK(stcb);
1331                                 goto null_return;
1332                         }
1333                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
1334                                 SCTP_TCB_UNLOCK(stcb);
1335                                 goto null_return;
1336                         }
1337                         if (local && !sctp_does_stcb_own_this_addr(stcb, local)) {
1338                                 SCTP_TCB_UNLOCK(stcb);
1339                                 goto null_return;
1340                         }
1341                         /* now look at the list of remote addresses */
1342                         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1343 #ifdef INVARIANTS
1344                                 if (net == (TAILQ_NEXT(net, sctp_next))) {
1345                                         panic("Corrupt net list");
1346                                 }
1347 #endif
1348                                 if (net->ro._l_addr.sa.sa_family !=
1349                                     remote->sa_family) {
1350                                         /* not the same family */
1351                                         continue;
1352                                 }
1353                                 switch (remote->sa_family) {
1354 #ifdef INET
1355                                 case AF_INET:
1356                                         {
1357                                                 struct sockaddr_in *sin,
1358                                                            *rsin;
1359
1360                                                 sin = (struct sockaddr_in *)
1361                                                     &net->ro._l_addr;
1362                                                 rsin = (struct sockaddr_in *)remote;
1363                                                 if (sin->sin_addr.s_addr ==
1364                                                     rsin->sin_addr.s_addr) {
1365                                                         /* found it */
1366                                                         if (netp != NULL) {
1367                                                                 *netp = net;
1368                                                         }
1369                                                         if (locked_tcb == NULL) {
1370                                                                 SCTP_INP_DECR_REF(inp);
1371                                                         } else if (locked_tcb != stcb) {
1372                                                                 SCTP_TCB_LOCK(locked_tcb);
1373                                                         }
1374                                                         if (locked_tcb) {
1375                                                                 atomic_subtract_int(&locked_tcb->asoc.refcnt, 1);
1376                                                         }
1377
1378                                                         SCTP_INP_WUNLOCK(inp);
1379                                                         SCTP_INP_INFO_RUNLOCK();
1380                                                         return (stcb);
1381                                                 }
1382                                                 break;
1383                                         }
1384 #endif
1385 #ifdef INET6
1386                                 case AF_INET6:
1387                                         {
1388                                                 struct sockaddr_in6 *sin6,
1389                                                             *rsin6;
1390
1391                                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1392                                                 rsin6 = (struct sockaddr_in6 *)remote;
1393                                                 if (SCTP6_ARE_ADDR_EQUAL(sin6,
1394                                                     rsin6)) {
1395                                                         /* found it */
1396                                                         if (netp != NULL) {
1397                                                                 *netp = net;
1398                                                         }
1399                                                         if (locked_tcb == NULL) {
1400                                                                 SCTP_INP_DECR_REF(inp);
1401                                                         } else if (locked_tcb != stcb) {
1402                                                                 SCTP_TCB_LOCK(locked_tcb);
1403                                                         }
1404                                                         if (locked_tcb) {
1405                                                                 atomic_subtract_int(&locked_tcb->asoc.refcnt, 1);
1406                                                         }
1407                                                         SCTP_INP_WUNLOCK(inp);
1408                                                         SCTP_INP_INFO_RUNLOCK();
1409                                                         return (stcb);
1410                                                 }
1411                                                 break;
1412                                         }
1413 #endif
1414                                 default:
1415                                         /* TSNH */
1416                                         break;
1417                                 }
1418                         }
1419                         SCTP_TCB_UNLOCK(stcb);
1420                 }
1421         } else {
1422                 SCTP_INP_WLOCK(inp);
1423                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) {
1424                         goto null_return;
1425                 }
1426                 head = &inp->sctp_tcbhash[SCTP_PCBHASH_ALLADDR(rport,
1427                     inp->sctp_hashmark)];
1428                 LIST_FOREACH(stcb, head, sctp_tcbhash) {
1429                         if (stcb->rport != rport) {
1430                                 /* remote port does not match */
1431                                 continue;
1432                         }
1433                         SCTP_TCB_LOCK(stcb);
1434                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
1435                                 SCTP_TCB_UNLOCK(stcb);
1436                                 continue;
1437                         }
1438                         if (local && !sctp_does_stcb_own_this_addr(stcb, local)) {
1439                                 SCTP_TCB_UNLOCK(stcb);
1440                                 continue;
1441                         }
1442                         /* now look at the list of remote addresses */
1443                         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1444 #ifdef INVARIANTS
1445                                 if (net == (TAILQ_NEXT(net, sctp_next))) {
1446                                         panic("Corrupt net list");
1447                                 }
1448 #endif
1449                                 if (net->ro._l_addr.sa.sa_family !=
1450                                     remote->sa_family) {
1451                                         /* not the same family */
1452                                         continue;
1453                                 }
1454                                 switch (remote->sa_family) {
1455 #ifdef INET
1456                                 case AF_INET:
1457                                         {
1458                                                 struct sockaddr_in *sin,
1459                                                            *rsin;
1460
1461                                                 sin = (struct sockaddr_in *)
1462                                                     &net->ro._l_addr;
1463                                                 rsin = (struct sockaddr_in *)remote;
1464                                                 if (sin->sin_addr.s_addr ==
1465                                                     rsin->sin_addr.s_addr) {
1466                                                         /* found it */
1467                                                         if (netp != NULL) {
1468                                                                 *netp = net;
1469                                                         }
1470                                                         if (locked_tcb == NULL) {
1471                                                                 SCTP_INP_DECR_REF(inp);
1472                                                         } else if (locked_tcb != stcb) {
1473                                                                 SCTP_TCB_LOCK(locked_tcb);
1474                                                         }
1475                                                         if (locked_tcb) {
1476                                                                 atomic_subtract_int(&locked_tcb->asoc.refcnt, 1);
1477                                                         }
1478                                                         SCTP_INP_WUNLOCK(inp);
1479                                                         SCTP_INP_INFO_RUNLOCK();
1480                                                         return (stcb);
1481                                                 }
1482                                                 break;
1483                                         }
1484 #endif
1485 #ifdef INET6
1486                                 case AF_INET6:
1487                                         {
1488                                                 struct sockaddr_in6 *sin6,
1489                                                             *rsin6;
1490
1491                                                 sin6 = (struct sockaddr_in6 *)
1492                                                     &net->ro._l_addr;
1493                                                 rsin6 = (struct sockaddr_in6 *)remote;
1494                                                 if (SCTP6_ARE_ADDR_EQUAL(sin6,
1495                                                     rsin6)) {
1496                                                         /* found it */
1497                                                         if (netp != NULL) {
1498                                                                 *netp = net;
1499                                                         }
1500                                                         if (locked_tcb == NULL) {
1501                                                                 SCTP_INP_DECR_REF(inp);
1502                                                         } else if (locked_tcb != stcb) {
1503                                                                 SCTP_TCB_LOCK(locked_tcb);
1504                                                         }
1505                                                         if (locked_tcb) {
1506                                                                 atomic_subtract_int(&locked_tcb->asoc.refcnt, 1);
1507                                                         }
1508                                                         SCTP_INP_WUNLOCK(inp);
1509                                                         SCTP_INP_INFO_RUNLOCK();
1510                                                         return (stcb);
1511                                                 }
1512                                                 break;
1513                                         }
1514 #endif
1515                                 default:
1516                                         /* TSNH */
1517                                         break;
1518                                 }
1519                         }
1520                         SCTP_TCB_UNLOCK(stcb);
1521                 }
1522         }
1523 null_return:
1524         /* clean up for returning null */
1525         if (locked_tcb) {
1526                 SCTP_TCB_LOCK(locked_tcb);
1527                 atomic_subtract_int(&locked_tcb->asoc.refcnt, 1);
1528         }
1529         SCTP_INP_WUNLOCK(inp);
1530         SCTP_INP_INFO_RUNLOCK();
1531         /* not found */
1532         return (NULL);
1533 }
1534
1535 /*
1536  * Find an association for a specific endpoint using the association id given
1537  * out in the COMM_UP notification
1538  */
1539 struct sctp_tcb *
1540 sctp_findasoc_ep_asocid_locked(struct sctp_inpcb *inp, sctp_assoc_t asoc_id, int want_lock)
1541 {
1542         /*
1543          * Use my the assoc_id to find a endpoint
1544          */
1545         struct sctpasochead *head;
1546         struct sctp_tcb *stcb;
1547         uint32_t id;
1548
1549         if (inp == NULL) {
1550                 SCTP_PRINTF("TSNH ep_associd\n");
1551                 return (NULL);
1552         }
1553         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) {
1554                 SCTP_PRINTF("TSNH ep_associd0\n");
1555                 return (NULL);
1556         }
1557         id = (uint32_t)asoc_id;
1558         head = &inp->sctp_asocidhash[SCTP_PCBHASH_ASOC(id, inp->hashasocidmark)];
1559         if (head == NULL) {
1560                 /* invalid id TSNH */
1561                 SCTP_PRINTF("TSNH ep_associd1\n");
1562                 return (NULL);
1563         }
1564         LIST_FOREACH(stcb, head, sctp_tcbasocidhash) {
1565                 if (stcb->asoc.assoc_id == id) {
1566                         if (inp != stcb->sctp_ep) {
1567                                 /*
1568                                  * some other guy has the same id active (id
1569                                  * collision ??).
1570                                  */
1571                                 SCTP_PRINTF("TSNH ep_associd2\n");
1572                                 continue;
1573                         }
1574                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
1575                                 continue;
1576                         }
1577                         if (want_lock) {
1578                                 SCTP_TCB_LOCK(stcb);
1579                         }
1580                         return (stcb);
1581                 }
1582         }
1583         return (NULL);
1584 }
1585
1586 struct sctp_tcb *
1587 sctp_findassociation_ep_asocid(struct sctp_inpcb *inp, sctp_assoc_t asoc_id, int want_lock)
1588 {
1589         struct sctp_tcb *stcb;
1590
1591         SCTP_INP_RLOCK(inp);
1592         stcb = sctp_findasoc_ep_asocid_locked(inp, asoc_id, want_lock);
1593         SCTP_INP_RUNLOCK(inp);
1594         return (stcb);
1595 }
1596
1597 /*
1598  * Endpoint probe expects that the INP_INFO is locked.
1599  */
1600 static struct sctp_inpcb *
1601 sctp_endpoint_probe(struct sockaddr *nam, struct sctppcbhead *head,
1602     uint16_t lport, uint32_t vrf_id)
1603 {
1604         struct sctp_inpcb *inp;
1605         struct sctp_laddr *laddr;
1606 #ifdef INET
1607         struct sockaddr_in *sin;
1608 #endif
1609 #ifdef INET6
1610         struct sockaddr_in6 *sin6;
1611         struct sockaddr_in6 *intf_addr6;
1612 #endif
1613         int fnd;
1614
1615 #ifdef INET
1616         sin = NULL;
1617 #endif
1618 #ifdef INET6
1619         sin6 = NULL;
1620 #endif
1621         switch (nam->sa_family) {
1622 #ifdef INET
1623         case AF_INET:
1624                 sin = (struct sockaddr_in *)nam;
1625                 break;
1626 #endif
1627 #ifdef INET6
1628         case AF_INET6:
1629                 sin6 = (struct sockaddr_in6 *)nam;
1630                 break;
1631 #endif
1632         default:
1633                 /* unsupported family */
1634                 return (NULL);
1635         }
1636
1637         if (head == NULL)
1638                 return (NULL);
1639
1640         LIST_FOREACH(inp, head, sctp_hash) {
1641                 SCTP_INP_RLOCK(inp);
1642                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) {
1643                         SCTP_INP_RUNLOCK(inp);
1644                         continue;
1645                 }
1646                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) &&
1647                     (inp->sctp_lport == lport)) {
1648                         /* got it */
1649                         switch (nam->sa_family) {
1650 #ifdef INET
1651                         case AF_INET:
1652                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) &&
1653                                     SCTP_IPV6_V6ONLY(inp)) {
1654                                         /*
1655                                          * IPv4 on a IPv6 socket with ONLY
1656                                          * IPv6 set
1657                                          */
1658                                         SCTP_INP_RUNLOCK(inp);
1659                                         continue;
1660                                 }
1661                                 if (prison_check_ip4(inp->ip_inp.inp.inp_cred,
1662                                     &sin->sin_addr) != 0) {
1663                                         SCTP_INP_RUNLOCK(inp);
1664                                         continue;
1665                                 }
1666                                 break;
1667 #endif
1668 #ifdef INET6
1669                         case AF_INET6:
1670                                 /*
1671                                  * A V6 address and the endpoint is NOT
1672                                  * bound V6
1673                                  */
1674                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) {
1675                                         SCTP_INP_RUNLOCK(inp);
1676                                         continue;
1677                                 }
1678                                 if (prison_check_ip6(inp->ip_inp.inp.inp_cred,
1679                                     &sin6->sin6_addr) != 0) {
1680                                         SCTP_INP_RUNLOCK(inp);
1681                                         continue;
1682                                 }
1683                                 break;
1684 #endif
1685                         default:
1686                                 break;
1687                         }
1688                         /* does a VRF id match? */
1689                         fnd = 0;
1690                         if (inp->def_vrf_id == vrf_id)
1691                                 fnd = 1;
1692
1693                         SCTP_INP_RUNLOCK(inp);
1694                         if (!fnd)
1695                                 continue;
1696                         return (inp);
1697                 }
1698                 SCTP_INP_RUNLOCK(inp);
1699         }
1700         switch (nam->sa_family) {
1701 #ifdef INET
1702         case AF_INET:
1703                 if (sin->sin_addr.s_addr == INADDR_ANY) {
1704                         /* Can't hunt for one that has no address specified */
1705                         return (NULL);
1706                 }
1707                 break;
1708 #endif
1709 #ifdef INET6
1710         case AF_INET6:
1711                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1712                         /* Can't hunt for one that has no address specified */
1713                         return (NULL);
1714                 }
1715                 break;
1716 #endif
1717         default:
1718                 break;
1719         }
1720         /*
1721          * ok, not bound to all so see if we can find a EP bound to this
1722          * address.
1723          */
1724         LIST_FOREACH(inp, head, sctp_hash) {
1725                 SCTP_INP_RLOCK(inp);
1726                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) {
1727                         SCTP_INP_RUNLOCK(inp);
1728                         continue;
1729                 }
1730                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL)) {
1731                         SCTP_INP_RUNLOCK(inp);
1732                         continue;
1733                 }
1734                 /*
1735                  * Ok this could be a likely candidate, look at all of its
1736                  * addresses
1737                  */
1738                 if (inp->sctp_lport != lport) {
1739                         SCTP_INP_RUNLOCK(inp);
1740                         continue;
1741                 }
1742                 /* does a VRF id match? */
1743                 fnd = 0;
1744                 if (inp->def_vrf_id == vrf_id)
1745                         fnd = 1;
1746
1747                 if (!fnd) {
1748                         SCTP_INP_RUNLOCK(inp);
1749                         continue;
1750                 }
1751                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
1752                         if (laddr->ifa == NULL) {
1753                                 SCTPDBG(SCTP_DEBUG_PCB1, "%s: NULL ifa\n",
1754                                     __func__);
1755                                 continue;
1756                         }
1757                         SCTPDBG(SCTP_DEBUG_PCB1, "Ok laddr->ifa:%p is possible, ",
1758                             (void *)laddr->ifa);
1759                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
1760                                 SCTPDBG(SCTP_DEBUG_PCB1, "Huh IFA being deleted\n");
1761                                 continue;
1762                         }
1763                         if (laddr->ifa->address.sa.sa_family == nam->sa_family) {
1764                                 /* possible, see if it matches */
1765                                 switch (nam->sa_family) {
1766 #ifdef INET
1767                                 case AF_INET:
1768                                         if (sin->sin_addr.s_addr ==
1769                                             laddr->ifa->address.sin.sin_addr.s_addr) {
1770                                                 SCTP_INP_RUNLOCK(inp);
1771                                                 return (inp);
1772                                         }
1773                                         break;
1774 #endif
1775 #ifdef INET6
1776                                 case AF_INET6:
1777                                         intf_addr6 = &laddr->ifa->address.sin6;
1778                                         if (SCTP6_ARE_ADDR_EQUAL(sin6,
1779                                             intf_addr6)) {
1780                                                 SCTP_INP_RUNLOCK(inp);
1781                                                 return (inp);
1782                                         }
1783                                         break;
1784 #endif
1785                                 }
1786                         }
1787                 }
1788                 SCTP_INP_RUNLOCK(inp);
1789         }
1790         return (NULL);
1791 }
1792
1793 static struct sctp_inpcb *
1794 sctp_isport_inuse(struct sctp_inpcb *inp, uint16_t lport, uint32_t vrf_id)
1795 {
1796         struct sctppcbhead *head;
1797         struct sctp_inpcb *t_inp;
1798         int fnd;
1799
1800         head = &SCTP_BASE_INFO(sctp_ephash)[SCTP_PCBHASH_ALLADDR(lport,
1801             SCTP_BASE_INFO(hashmark))];
1802         LIST_FOREACH(t_inp, head, sctp_hash) {
1803                 if (t_inp->sctp_lport != lport) {
1804                         continue;
1805                 }
1806                 /* is it in the VRF in question */
1807                 fnd = 0;
1808                 if (t_inp->def_vrf_id == vrf_id)
1809                         fnd = 1;
1810                 if (!fnd)
1811                         continue;
1812
1813                 /* This one is in use. */
1814                 /* check the v6/v4 binding issue */
1815                 if ((t_inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) &&
1816                     SCTP_IPV6_V6ONLY(t_inp)) {
1817                         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
1818                                 /* collision in V6 space */
1819                                 return (t_inp);
1820                         } else {
1821                                 /* inp is BOUND_V4 no conflict */
1822                                 continue;
1823                         }
1824                 } else if (t_inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
1825                         /* t_inp is bound v4 and v6, conflict always */
1826                         return (t_inp);
1827                 } else {
1828                         /* t_inp is bound only V4 */
1829                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) &&
1830                             SCTP_IPV6_V6ONLY(inp)) {
1831                                 /* no conflict */
1832                                 continue;
1833                         }
1834                         /* else fall through to conflict */
1835                 }
1836                 return (t_inp);
1837         }
1838         return (NULL);
1839 }
1840
1841 int
1842 sctp_swap_inpcb_for_listen(struct sctp_inpcb *inp)
1843 {
1844         /* For 1-2-1 with port reuse */
1845         struct sctppcbhead *head;
1846         struct sctp_inpcb *tinp, *ninp;
1847
1848         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_PORTREUSE)) {
1849                 /* only works with port reuse on */
1850                 return (-1);
1851         }
1852         if ((inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL) == 0) {
1853                 return (0);
1854         }
1855         SCTP_INP_RUNLOCK(inp);
1856         SCTP_INP_INFO_WLOCK();
1857         head = &SCTP_BASE_INFO(sctp_ephash)[SCTP_PCBHASH_ALLADDR(inp->sctp_lport,
1858             SCTP_BASE_INFO(hashmark))];
1859         /* Kick out all non-listeners to the TCP hash */
1860         LIST_FOREACH_SAFE(tinp, head, sctp_hash, ninp) {
1861                 if (tinp->sctp_lport != inp->sctp_lport) {
1862                         continue;
1863                 }
1864                 if (tinp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) {
1865                         continue;
1866                 }
1867                 if (tinp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
1868                         continue;
1869                 }
1870                 if (SCTP_IS_LISTENING(tinp)) {
1871                         continue;
1872                 }
1873                 SCTP_INP_WLOCK(tinp);
1874                 LIST_REMOVE(tinp, sctp_hash);
1875                 head = &SCTP_BASE_INFO(sctp_tcpephash)[SCTP_PCBHASH_ALLADDR(tinp->sctp_lport, SCTP_BASE_INFO(hashtcpmark))];
1876                 tinp->sctp_flags |= SCTP_PCB_FLAGS_IN_TCPPOOL;
1877                 LIST_INSERT_HEAD(head, tinp, sctp_hash);
1878                 SCTP_INP_WUNLOCK(tinp);
1879         }
1880         SCTP_INP_WLOCK(inp);
1881         /* Pull from where he was */
1882         LIST_REMOVE(inp, sctp_hash);
1883         inp->sctp_flags &= ~SCTP_PCB_FLAGS_IN_TCPPOOL;
1884         head = &SCTP_BASE_INFO(sctp_ephash)[SCTP_PCBHASH_ALLADDR(inp->sctp_lport, SCTP_BASE_INFO(hashmark))];
1885         LIST_INSERT_HEAD(head, inp, sctp_hash);
1886         SCTP_INP_WUNLOCK(inp);
1887         SCTP_INP_RLOCK(inp);
1888         SCTP_INP_INFO_WUNLOCK();
1889         return (0);
1890 }
1891
1892 struct sctp_inpcb *
1893 sctp_pcb_findep(struct sockaddr *nam, int find_tcp_pool, int have_lock,
1894     uint32_t vrf_id)
1895 {
1896         /*
1897          * First we check the hash table to see if someone has this port
1898          * bound with just the port.
1899          */
1900         struct sctp_inpcb *inp;
1901         struct sctppcbhead *head;
1902         int lport;
1903         unsigned int i;
1904 #ifdef INET
1905         struct sockaddr_in *sin;
1906 #endif
1907 #ifdef INET6
1908         struct sockaddr_in6 *sin6;
1909 #endif
1910
1911         switch (nam->sa_family) {
1912 #ifdef INET
1913         case AF_INET:
1914                 sin = (struct sockaddr_in *)nam;
1915                 lport = sin->sin_port;
1916                 break;
1917 #endif
1918 #ifdef INET6
1919         case AF_INET6:
1920                 sin6 = (struct sockaddr_in6 *)nam;
1921                 lport = sin6->sin6_port;
1922                 break;
1923 #endif
1924         default:
1925                 return (NULL);
1926         }
1927         /*
1928          * I could cheat here and just cast to one of the types but we will
1929          * do it right. It also provides the check against an Unsupported
1930          * type too.
1931          */
1932         /* Find the head of the ALLADDR chain */
1933         if (have_lock == 0) {
1934                 SCTP_INP_INFO_RLOCK();
1935         }
1936         head = &SCTP_BASE_INFO(sctp_ephash)[SCTP_PCBHASH_ALLADDR(lport,
1937             SCTP_BASE_INFO(hashmark))];
1938         inp = sctp_endpoint_probe(nam, head, lport, vrf_id);
1939
1940         /*
1941          * If the TCP model exists it could be that the main listening
1942          * endpoint is gone but there still exists a connected socket for
1943          * this guy. If so we can return the first one that we find. This
1944          * may NOT be the correct one so the caller should be wary on the
1945          * returned INP. Currently the only caller that sets find_tcp_pool
1946          * is in bindx where we are verifying that a user CAN bind the
1947          * address. He either has bound it already, or someone else has, or
1948          * its open to bind, so this is good enough.
1949          */
1950         if (inp == NULL && find_tcp_pool) {
1951                 for (i = 0; i < SCTP_BASE_INFO(hashtcpmark) + 1; i++) {
1952                         head = &SCTP_BASE_INFO(sctp_tcpephash)[i];
1953                         inp = sctp_endpoint_probe(nam, head, lport, vrf_id);
1954                         if (inp) {
1955                                 break;
1956                         }
1957                 }
1958         }
1959         if (inp) {
1960                 SCTP_INP_INCR_REF(inp);
1961         }
1962         if (have_lock == 0) {
1963                 SCTP_INP_INFO_RUNLOCK();
1964         }
1965         return (inp);
1966 }
1967
1968 /*
1969  * Find an association for an endpoint with the pointer to whom you want to
1970  * send to and the endpoint pointer. The address can be IPv4 or IPv6. We may
1971  * need to change the *to to some other struct like a mbuf...
1972  */
1973 struct sctp_tcb *
1974 sctp_findassociation_addr_sa(struct sockaddr *from, struct sockaddr *to,
1975     struct sctp_inpcb **inp_p, struct sctp_nets **netp, int find_tcp_pool,
1976     uint32_t vrf_id)
1977 {
1978         struct sctp_inpcb *inp = NULL;
1979         struct sctp_tcb *stcb;
1980
1981         SCTP_INP_INFO_RLOCK();
1982         if (find_tcp_pool) {
1983                 if (inp_p != NULL) {
1984                         stcb = sctp_tcb_special_locate(inp_p, from, to, netp,
1985                             vrf_id);
1986                 } else {
1987                         stcb = sctp_tcb_special_locate(&inp, from, to, netp,
1988                             vrf_id);
1989                 }
1990                 if (stcb != NULL) {
1991                         SCTP_INP_INFO_RUNLOCK();
1992                         return (stcb);
1993                 }
1994         }
1995         inp = sctp_pcb_findep(to, 0, 1, vrf_id);
1996         if (inp_p != NULL) {
1997                 *inp_p = inp;
1998         }
1999         SCTP_INP_INFO_RUNLOCK();
2000         if (inp == NULL) {
2001                 return (NULL);
2002         }
2003         /*
2004          * ok, we have an endpoint, now lets find the assoc for it (if any)
2005          * we now place the source address or from in the to of the find
2006          * endpoint call. Since in reality this chain is used from the
2007          * inbound packet side.
2008          */
2009         if (inp_p != NULL) {
2010                 stcb = sctp_findassociation_ep_addr(inp_p, from, netp, to,
2011                     NULL);
2012         } else {
2013                 stcb = sctp_findassociation_ep_addr(&inp, from, netp, to,
2014                     NULL);
2015         }
2016         return (stcb);
2017 }
2018
2019 /*
2020  * This routine will grub through the mbuf that is a INIT or INIT-ACK and
2021  * find all addresses that the sender has specified in any address list. Each
2022  * address will be used to lookup the TCB and see if one exits.
2023  */
2024 static struct sctp_tcb *
2025 sctp_findassociation_special_addr(struct mbuf *m, int offset,
2026     struct sctphdr *sh, struct sctp_inpcb **inp_p, struct sctp_nets **netp,
2027     struct sockaddr *dst)
2028 {
2029         struct sctp_paramhdr *phdr, param_buf;
2030 #if defined(INET) || defined(INET6)
2031         struct sctp_tcb *stcb;
2032         uint16_t ptype;
2033 #endif
2034         uint16_t plen;
2035 #ifdef INET
2036         struct sockaddr_in sin4;
2037 #endif
2038 #ifdef INET6
2039         struct sockaddr_in6 sin6;
2040 #endif
2041
2042 #ifdef INET
2043         memset(&sin4, 0, sizeof(sin4));
2044         sin4.sin_len = sizeof(sin4);
2045         sin4.sin_family = AF_INET;
2046         sin4.sin_port = sh->src_port;
2047 #endif
2048 #ifdef INET6
2049         memset(&sin6, 0, sizeof(sin6));
2050         sin6.sin6_len = sizeof(sin6);
2051         sin6.sin6_family = AF_INET6;
2052         sin6.sin6_port = sh->src_port;
2053 #endif
2054
2055         offset += sizeof(struct sctp_init_chunk);
2056
2057         phdr = sctp_get_next_param(m, offset, &param_buf, sizeof(param_buf));
2058         while (phdr != NULL) {
2059                 /* now we must see if we want the parameter */
2060 #if defined(INET) || defined(INET6)
2061                 ptype = ntohs(phdr->param_type);
2062 #endif
2063                 plen = ntohs(phdr->param_length);
2064                 if (plen == 0) {
2065                         break;
2066                 }
2067 #ifdef INET
2068                 if (ptype == SCTP_IPV4_ADDRESS &&
2069                     plen == sizeof(struct sctp_ipv4addr_param)) {
2070                         /* Get the rest of the address */
2071                         struct sctp_ipv4addr_param ip4_param, *p4;
2072
2073                         phdr = sctp_get_next_param(m, offset,
2074                             (struct sctp_paramhdr *)&ip4_param, sizeof(ip4_param));
2075                         if (phdr == NULL) {
2076                                 return (NULL);
2077                         }
2078                         p4 = (struct sctp_ipv4addr_param *)phdr;
2079                         memcpy(&sin4.sin_addr, &p4->addr, sizeof(p4->addr));
2080                         /* look it up */
2081                         stcb = sctp_findassociation_ep_addr(inp_p,
2082                             (struct sockaddr *)&sin4, netp, dst, NULL);
2083                         if (stcb != NULL) {
2084                                 return (stcb);
2085                         }
2086                 }
2087 #endif
2088 #ifdef INET6
2089                 if (ptype == SCTP_IPV6_ADDRESS &&
2090                     plen == sizeof(struct sctp_ipv6addr_param)) {
2091                         /* Get the rest of the address */
2092                         struct sctp_ipv6addr_param ip6_param, *p6;
2093
2094                         phdr = sctp_get_next_param(m, offset,
2095                             (struct sctp_paramhdr *)&ip6_param, sizeof(ip6_param));
2096                         if (phdr == NULL) {
2097                                 return (NULL);
2098                         }
2099                         p6 = (struct sctp_ipv6addr_param *)phdr;
2100                         memcpy(&sin6.sin6_addr, &p6->addr, sizeof(p6->addr));
2101                         /* look it up */
2102                         stcb = sctp_findassociation_ep_addr(inp_p,
2103                             (struct sockaddr *)&sin6, netp, dst, NULL);
2104                         if (stcb != NULL) {
2105                                 return (stcb);
2106                         }
2107                 }
2108 #endif
2109                 offset += SCTP_SIZE32(plen);
2110                 phdr = sctp_get_next_param(m, offset, &param_buf,
2111                     sizeof(param_buf));
2112         }
2113         return (NULL);
2114 }
2115
2116 static struct sctp_tcb *
2117 sctp_findassoc_by_vtag(struct sockaddr *from, struct sockaddr *to, uint32_t vtag,
2118     struct sctp_inpcb **inp_p, struct sctp_nets **netp, uint16_t rport,
2119     uint16_t lport, int skip_src_check, uint32_t vrf_id, uint32_t remote_tag)
2120 {
2121         /*
2122          * Use my vtag to hash. If we find it we then verify the source addr
2123          * is in the assoc. If all goes well we save a bit on rec of a
2124          * packet.
2125          */
2126         struct sctpasochead *head;
2127         struct sctp_nets *net;
2128         struct sctp_tcb *stcb;
2129
2130         SCTP_INP_INFO_RLOCK();
2131         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(vtag,
2132             SCTP_BASE_INFO(hashasocmark))];
2133         LIST_FOREACH(stcb, head, sctp_asocs) {
2134                 SCTP_INP_RLOCK(stcb->sctp_ep);
2135                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) {
2136                         SCTP_INP_RUNLOCK(stcb->sctp_ep);
2137                         continue;
2138                 }
2139                 if (stcb->sctp_ep->def_vrf_id != vrf_id) {
2140                         SCTP_INP_RUNLOCK(stcb->sctp_ep);
2141                         continue;
2142                 }
2143                 SCTP_TCB_LOCK(stcb);
2144                 SCTP_INP_RUNLOCK(stcb->sctp_ep);
2145                 if (stcb->asoc.my_vtag == vtag) {
2146                         /* candidate */
2147                         if (stcb->rport != rport) {
2148                                 SCTP_TCB_UNLOCK(stcb);
2149                                 continue;
2150                         }
2151                         if (stcb->sctp_ep->sctp_lport != lport) {
2152                                 SCTP_TCB_UNLOCK(stcb);
2153                                 continue;
2154                         }
2155                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
2156                                 SCTP_TCB_UNLOCK(stcb);
2157                                 continue;
2158                         }
2159                         /* RRS:Need toaddr check here */
2160                         if (sctp_does_stcb_own_this_addr(stcb, to) == 0) {
2161                                 /* Endpoint does not own this address */
2162                                 SCTP_TCB_UNLOCK(stcb);
2163                                 continue;
2164                         }
2165                         if (remote_tag) {
2166                                 /*
2167                                  * If we have both vtags that's all we match
2168                                  * on
2169                                  */
2170                                 if (stcb->asoc.peer_vtag == remote_tag) {
2171                                         /*
2172                                          * If both tags match we consider it
2173                                          * conclusive and check NO
2174                                          * source/destination addresses
2175                                          */
2176                                         goto conclusive;
2177                                 }
2178                         }
2179                         if (skip_src_check) {
2180                 conclusive:
2181                                 if (from) {
2182                                         *netp = sctp_findnet(stcb, from);
2183                                 } else {
2184                                         *netp = NULL;   /* unknown */
2185                                 }
2186                                 if (inp_p)
2187                                         *inp_p = stcb->sctp_ep;
2188                                 SCTP_INP_INFO_RUNLOCK();
2189                                 return (stcb);
2190                         }
2191                         net = sctp_findnet(stcb, from);
2192                         if (net) {
2193                                 /* yep its him. */
2194                                 *netp = net;
2195                                 SCTP_STAT_INCR(sctps_vtagexpress);
2196                                 *inp_p = stcb->sctp_ep;
2197                                 SCTP_INP_INFO_RUNLOCK();
2198                                 return (stcb);
2199                         } else {
2200                                 /*
2201                                  * not him, this should only happen in rare
2202                                  * cases so I peg it.
2203                                  */
2204                                 SCTP_STAT_INCR(sctps_vtagbogus);
2205                         }
2206                 }
2207                 SCTP_TCB_UNLOCK(stcb);
2208         }
2209         SCTP_INP_INFO_RUNLOCK();
2210         return (NULL);
2211 }
2212
2213 /*
2214  * Find an association with the pointer to the inbound IP packet. This can be
2215  * a IPv4 or IPv6 packet.
2216  */
2217 struct sctp_tcb *
2218 sctp_findassociation_addr(struct mbuf *m, int offset,
2219     struct sockaddr *src, struct sockaddr *dst,
2220     struct sctphdr *sh, struct sctp_chunkhdr *ch,
2221     struct sctp_inpcb **inp_p, struct sctp_nets **netp, uint32_t vrf_id)
2222 {
2223         struct sctp_tcb *stcb;
2224         struct sctp_inpcb *inp;
2225
2226         if (sh->v_tag) {
2227                 /* we only go down this path if vtag is non-zero */
2228                 stcb = sctp_findassoc_by_vtag(src, dst, ntohl(sh->v_tag),
2229                     inp_p, netp, sh->src_port, sh->dest_port, 0, vrf_id, 0);
2230                 if (stcb) {
2231                         return (stcb);
2232                 }
2233         }
2234
2235         if (inp_p) {
2236                 stcb = sctp_findassociation_addr_sa(src, dst, inp_p, netp,
2237                     1, vrf_id);
2238                 inp = *inp_p;
2239         } else {
2240                 stcb = sctp_findassociation_addr_sa(src, dst, &inp, netp,
2241                     1, vrf_id);
2242         }
2243         SCTPDBG(SCTP_DEBUG_PCB1, "stcb:%p inp:%p\n", (void *)stcb, (void *)inp);
2244         if (stcb == NULL && inp) {
2245                 /* Found a EP but not this address */
2246                 if ((ch->chunk_type == SCTP_INITIATION) ||
2247                     (ch->chunk_type == SCTP_INITIATION_ACK)) {
2248                         /*-
2249                          * special hook, we do NOT return linp or an
2250                          * association that is linked to an existing
2251                          * association that is under the TCP pool (i.e. no
2252                          * listener exists). The endpoint finding routine
2253                          * will always find a listener before examining the
2254                          * TCP pool.
2255                          */
2256                         if (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL) {
2257                                 if (inp_p) {
2258                                         *inp_p = NULL;
2259                                 }
2260                                 return (NULL);
2261                         }
2262                         stcb = sctp_findassociation_special_addr(m,
2263                             offset, sh, &inp, netp, dst);
2264                         if (inp_p != NULL) {
2265                                 *inp_p = inp;
2266                         }
2267                 }
2268         }
2269         SCTPDBG(SCTP_DEBUG_PCB1, "stcb is %p\n", (void *)stcb);
2270         return (stcb);
2271 }
2272
2273 /*
2274  * lookup an association by an ASCONF lookup address.
2275  * if the lookup address is 0.0.0.0 or ::0, use the vtag to do the lookup
2276  */
2277 struct sctp_tcb *
2278 sctp_findassociation_ep_asconf(struct mbuf *m, int offset,
2279     struct sockaddr *dst, struct sctphdr *sh,
2280     struct sctp_inpcb **inp_p, struct sctp_nets **netp, uint32_t vrf_id)
2281 {
2282         struct sctp_tcb *stcb;
2283         union sctp_sockstore remote_store;
2284         struct sctp_paramhdr param_buf, *phdr;
2285         int ptype;
2286         int zero_address = 0;
2287 #ifdef INET
2288         struct sockaddr_in *sin;
2289 #endif
2290 #ifdef INET6
2291         struct sockaddr_in6 *sin6;
2292 #endif
2293
2294         memset(&remote_store, 0, sizeof(remote_store));
2295         phdr = sctp_get_next_param(m, offset + sizeof(struct sctp_asconf_chunk),
2296             &param_buf, sizeof(struct sctp_paramhdr));
2297         if (phdr == NULL) {
2298                 SCTPDBG(SCTP_DEBUG_INPUT3, "%s: failed to get asconf lookup addr\n",
2299                     __func__);
2300                 return NULL;
2301         }
2302         ptype = (int)((uint32_t)ntohs(phdr->param_type));
2303         /* get the correlation address */
2304         switch (ptype) {
2305 #ifdef INET6
2306         case SCTP_IPV6_ADDRESS:
2307                 {
2308                         /* ipv6 address param */
2309                         struct sctp_ipv6addr_param *p6, p6_buf;
2310
2311                         if (ntohs(phdr->param_length) != sizeof(struct sctp_ipv6addr_param)) {
2312                                 return NULL;
2313                         }
2314                         p6 = (struct sctp_ipv6addr_param *)sctp_get_next_param(m,
2315                             offset + sizeof(struct sctp_asconf_chunk),
2316                             &p6_buf.ph, sizeof(p6_buf));
2317                         if (p6 == NULL) {
2318                                 SCTPDBG(SCTP_DEBUG_INPUT3, "%s: failed to get asconf v6 lookup addr\n",
2319                                     __func__);
2320                                 return (NULL);
2321                         }
2322                         sin6 = &remote_store.sin6;
2323                         sin6->sin6_family = AF_INET6;
2324                         sin6->sin6_len = sizeof(*sin6);
2325                         sin6->sin6_port = sh->src_port;
2326                         memcpy(&sin6->sin6_addr, &p6->addr, sizeof(struct in6_addr));
2327                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
2328                                 zero_address = 1;
2329                         break;
2330                 }
2331 #endif
2332 #ifdef INET
2333         case SCTP_IPV4_ADDRESS:
2334                 {
2335                         /* ipv4 address param */
2336                         struct sctp_ipv4addr_param *p4, p4_buf;
2337
2338                         if (ntohs(phdr->param_length) != sizeof(struct sctp_ipv4addr_param)) {
2339                                 return NULL;
2340                         }
2341                         p4 = (struct sctp_ipv4addr_param *)sctp_get_next_param(m,
2342                             offset + sizeof(struct sctp_asconf_chunk),
2343                             &p4_buf.ph, sizeof(p4_buf));
2344                         if (p4 == NULL) {
2345                                 SCTPDBG(SCTP_DEBUG_INPUT3, "%s: failed to get asconf v4 lookup addr\n",
2346                                     __func__);
2347                                 return (NULL);
2348                         }
2349                         sin = &remote_store.sin;
2350                         sin->sin_family = AF_INET;
2351                         sin->sin_len = sizeof(*sin);
2352                         sin->sin_port = sh->src_port;
2353                         memcpy(&sin->sin_addr, &p4->addr, sizeof(struct in_addr));
2354                         if (sin->sin_addr.s_addr == INADDR_ANY)
2355                                 zero_address = 1;
2356                         break;
2357                 }
2358 #endif
2359         default:
2360                 /* invalid address param type */
2361                 return NULL;
2362         }
2363
2364         if (zero_address) {
2365                 stcb = sctp_findassoc_by_vtag(NULL, dst, ntohl(sh->v_tag), inp_p,
2366                     netp, sh->src_port, sh->dest_port, 1, vrf_id, 0);
2367                 if (stcb != NULL) {
2368                         SCTP_INP_DECR_REF(*inp_p);
2369                 }
2370         } else {
2371                 stcb = sctp_findassociation_ep_addr(inp_p,
2372                     &remote_store.sa, netp,
2373                     dst, NULL);
2374         }
2375         return (stcb);
2376 }
2377
2378 /*
2379  * allocate a sctp_inpcb and setup a temporary binding to a port/all
2380  * addresses. This way if we don't get a bind we by default pick a ephemeral
2381  * port with all addresses bound.
2382  */
2383 int
2384 sctp_inpcb_alloc(struct socket *so, uint32_t vrf_id)
2385 {
2386         /*
2387          * we get called when a new endpoint starts up. We need to allocate
2388          * the sctp_inpcb structure from the zone and init it. Mark it as
2389          * unbound and find a port that we can use as an ephemeral with
2390          * INADDR_ANY. If the user binds later no problem we can then add in
2391          * the specific addresses. And setup the default parameters for the
2392          * EP.
2393          */
2394         int i, error;
2395         struct sctp_inpcb *inp;
2396         struct sctp_pcb *m;
2397         struct timeval time;
2398         sctp_sharedkey_t *null_key;
2399
2400         error = 0;
2401
2402         SCTP_INP_INFO_WLOCK();
2403         inp = SCTP_ZONE_GET(SCTP_BASE_INFO(ipi_zone_ep), struct sctp_inpcb);
2404         if (inp == NULL) {
2405                 SCTP_PRINTF("Out of SCTP-INPCB structures - no resources\n");
2406                 SCTP_INP_INFO_WUNLOCK();
2407                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, ENOBUFS);
2408                 return (ENOBUFS);
2409         }
2410         /* zap it */
2411         memset(inp, 0, sizeof(*inp));
2412
2413         /* bump generations */
2414         /* setup socket pointers */
2415         inp->sctp_socket = so;
2416         inp->ip_inp.inp.inp_socket = so;
2417         inp->ip_inp.inp.inp_cred = crhold(so->so_cred);
2418 #ifdef INET6
2419         if (INP_SOCKAF(so) == AF_INET6) {
2420                 if (MODULE_GLOBAL(ip6_auto_flowlabel)) {
2421                         inp->ip_inp.inp.inp_flags |= IN6P_AUTOFLOWLABEL;
2422                 }
2423                 if (MODULE_GLOBAL(ip6_v6only)) {
2424                         inp->ip_inp.inp.inp_flags |= IN6P_IPV6_V6ONLY;
2425                 }
2426         }
2427 #endif
2428         inp->sctp_associd_counter = 1;
2429         inp->partial_delivery_point = SCTP_SB_LIMIT_RCV(so) >> SCTP_PARTIAL_DELIVERY_SHIFT;
2430         inp->sctp_frag_point = SCTP_DEFAULT_MAXSEGMENT;
2431         inp->max_cwnd = 0;
2432         inp->sctp_cmt_on_off = SCTP_BASE_SYSCTL(sctp_cmt_on_off);
2433         inp->ecn_supported = (uint8_t)SCTP_BASE_SYSCTL(sctp_ecn_enable);
2434         inp->prsctp_supported = (uint8_t)SCTP_BASE_SYSCTL(sctp_pr_enable);
2435         inp->auth_supported = (uint8_t)SCTP_BASE_SYSCTL(sctp_auth_enable);
2436         inp->asconf_supported = (uint8_t)SCTP_BASE_SYSCTL(sctp_asconf_enable);
2437         inp->reconfig_supported = (uint8_t)SCTP_BASE_SYSCTL(sctp_reconfig_enable);
2438         inp->nrsack_supported = (uint8_t)SCTP_BASE_SYSCTL(sctp_nrsack_enable);
2439         inp->pktdrop_supported = (uint8_t)SCTP_BASE_SYSCTL(sctp_pktdrop_enable);
2440         inp->idata_supported = 0;
2441
2442         inp->fibnum = so->so_fibnum;
2443         /* init the small hash table we use to track asocid <-> tcb */
2444         inp->sctp_asocidhash = SCTP_HASH_INIT(SCTP_STACK_VTAG_HASH_SIZE, &inp->hashasocidmark);
2445         if (inp->sctp_asocidhash == NULL) {
2446                 crfree(inp->ip_inp.inp.inp_cred);
2447                 SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_ep), inp);
2448                 SCTP_INP_INFO_WUNLOCK();
2449                 return (ENOBUFS);
2450         }
2451         SCTP_INCR_EP_COUNT();
2452         inp->ip_inp.inp.inp_ip_ttl = MODULE_GLOBAL(ip_defttl);
2453         SCTP_INP_INFO_WUNLOCK();
2454
2455         so->so_pcb = (caddr_t)inp;
2456
2457         if (SCTP_SO_TYPE(so) == SOCK_SEQPACKET) {
2458                 /* UDP style socket */
2459                 inp->sctp_flags = (SCTP_PCB_FLAGS_UDPTYPE |
2460                     SCTP_PCB_FLAGS_UNBOUND);
2461                 /* Be sure it is NON-BLOCKING IO for UDP */
2462                 /* SCTP_SET_SO_NBIO(so); */
2463         } else if (SCTP_SO_TYPE(so) == SOCK_STREAM) {
2464                 /* TCP style socket */
2465                 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2466                     SCTP_PCB_FLAGS_UNBOUND);
2467                 /* Be sure we have blocking IO by default */
2468                 SOCK_LOCK(so);
2469                 SCTP_CLEAR_SO_NBIO(so);
2470                 SOCK_UNLOCK(so);
2471         } else {
2472                 /*
2473                  * unsupported socket type (RAW, etc)- in case we missed it
2474                  * in protosw
2475                  */
2476                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, EOPNOTSUPP);
2477                 so->so_pcb = NULL;
2478                 crfree(inp->ip_inp.inp.inp_cred);
2479                 SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_ep), inp);
2480                 return (EOPNOTSUPP);
2481         }
2482         if (SCTP_BASE_SYSCTL(sctp_default_frag_interleave) == SCTP_FRAG_LEVEL_1) {
2483                 sctp_feature_on(inp, SCTP_PCB_FLAGS_FRAG_INTERLEAVE);
2484                 sctp_feature_off(inp, SCTP_PCB_FLAGS_INTERLEAVE_STRMS);
2485         } else if (SCTP_BASE_SYSCTL(sctp_default_frag_interleave) == SCTP_FRAG_LEVEL_2) {
2486                 sctp_feature_on(inp, SCTP_PCB_FLAGS_FRAG_INTERLEAVE);
2487                 sctp_feature_on(inp, SCTP_PCB_FLAGS_INTERLEAVE_STRMS);
2488         } else if (SCTP_BASE_SYSCTL(sctp_default_frag_interleave) == SCTP_FRAG_LEVEL_0) {
2489                 sctp_feature_off(inp, SCTP_PCB_FLAGS_FRAG_INTERLEAVE);
2490                 sctp_feature_off(inp, SCTP_PCB_FLAGS_INTERLEAVE_STRMS);
2491         }
2492         inp->sctp_tcbhash = SCTP_HASH_INIT(SCTP_BASE_SYSCTL(sctp_pcbtblsize),
2493             &inp->sctp_hashmark);
2494         if (inp->sctp_tcbhash == NULL) {
2495                 SCTP_PRINTF("Out of SCTP-INPCB->hashinit - no resources\n");
2496                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, ENOBUFS);
2497                 so->so_pcb = NULL;
2498                 crfree(inp->ip_inp.inp.inp_cred);
2499                 SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_ep), inp);
2500                 return (ENOBUFS);
2501         }
2502         inp->def_vrf_id = vrf_id;
2503
2504         SCTP_INP_INFO_WLOCK();
2505         SCTP_INP_LOCK_INIT(inp);
2506         INP_LOCK_INIT(&inp->ip_inp.inp, "inp", "sctpinp");
2507         SCTP_INP_READ_INIT(inp);
2508         SCTP_ASOC_CREATE_LOCK_INIT(inp);
2509         /* lock the new ep */
2510         SCTP_INP_WLOCK(inp);
2511
2512         /* add it to the info area */
2513         LIST_INSERT_HEAD(&SCTP_BASE_INFO(listhead), inp, sctp_list);
2514         SCTP_INP_INFO_WUNLOCK();
2515
2516         TAILQ_INIT(&inp->read_queue);
2517         LIST_INIT(&inp->sctp_addr_list);
2518
2519         LIST_INIT(&inp->sctp_asoc_list);
2520
2521 #ifdef SCTP_TRACK_FREED_ASOCS
2522         /* TEMP CODE */
2523         LIST_INIT(&inp->sctp_asoc_free_list);
2524 #endif
2525         /* Init the timer structure for signature change */
2526         SCTP_OS_TIMER_INIT(&inp->sctp_ep.signature_change.timer);
2527         inp->sctp_ep.signature_change.type = SCTP_TIMER_TYPE_NEWCOOKIE;
2528
2529         /* now init the actual endpoint default data */
2530         m = &inp->sctp_ep;
2531
2532         /* setup the base timeout information */
2533         m->sctp_timeoutticks[SCTP_TIMER_SEND] = sctp_secs_to_ticks(SCTP_SEND_SEC);      /* needed ? */
2534         m->sctp_timeoutticks[SCTP_TIMER_INIT] = sctp_secs_to_ticks(SCTP_INIT_SEC);      /* needed ? */
2535         m->sctp_timeoutticks[SCTP_TIMER_RECV] = sctp_msecs_to_ticks(SCTP_BASE_SYSCTL(sctp_delayed_sack_time_default));
2536         m->sctp_timeoutticks[SCTP_TIMER_HEARTBEAT] = sctp_msecs_to_ticks(SCTP_BASE_SYSCTL(sctp_heartbeat_interval_default));
2537         m->sctp_timeoutticks[SCTP_TIMER_PMTU] = sctp_secs_to_ticks(SCTP_BASE_SYSCTL(sctp_pmtu_raise_time_default));
2538         m->sctp_timeoutticks[SCTP_TIMER_MAXSHUTDOWN] = sctp_secs_to_ticks(SCTP_BASE_SYSCTL(sctp_shutdown_guard_time_default));
2539         m->sctp_timeoutticks[SCTP_TIMER_SIGNATURE] = sctp_secs_to_ticks(SCTP_BASE_SYSCTL(sctp_secret_lifetime_default));
2540         /* all max/min max are in ms */
2541         m->sctp_maxrto = SCTP_BASE_SYSCTL(sctp_rto_max_default);
2542         m->sctp_minrto = SCTP_BASE_SYSCTL(sctp_rto_min_default);
2543         m->initial_rto = SCTP_BASE_SYSCTL(sctp_rto_initial_default);
2544         m->initial_init_rto_max = SCTP_BASE_SYSCTL(sctp_init_rto_max_default);
2545         m->sctp_sack_freq = SCTP_BASE_SYSCTL(sctp_sack_freq_default);
2546         m->max_init_times = SCTP_BASE_SYSCTL(sctp_init_rtx_max_default);
2547         m->max_send_times = SCTP_BASE_SYSCTL(sctp_assoc_rtx_max_default);
2548         m->def_net_failure = SCTP_BASE_SYSCTL(sctp_path_rtx_max_default);
2549         m->def_net_pf_threshold = SCTP_BASE_SYSCTL(sctp_path_pf_threshold);
2550         m->sctp_sws_sender = SCTP_SWS_SENDER_DEF;
2551         m->sctp_sws_receiver = SCTP_SWS_RECEIVER_DEF;
2552         m->max_burst = SCTP_BASE_SYSCTL(sctp_max_burst_default);
2553         m->fr_max_burst = SCTP_BASE_SYSCTL(sctp_fr_max_burst_default);
2554
2555         m->sctp_default_cc_module = SCTP_BASE_SYSCTL(sctp_default_cc_module);
2556         m->sctp_default_ss_module = SCTP_BASE_SYSCTL(sctp_default_ss_module);
2557         m->max_open_streams_intome = SCTP_BASE_SYSCTL(sctp_nr_incoming_streams_default);
2558         /* number of streams to pre-open on a association */
2559         m->pre_open_stream_count = SCTP_BASE_SYSCTL(sctp_nr_outgoing_streams_default);
2560
2561         m->default_mtu = 0;
2562         /* Add adaptation cookie */
2563         m->adaptation_layer_indicator = 0;
2564         m->adaptation_layer_indicator_provided = 0;
2565
2566         /* seed random number generator */
2567         m->random_counter = 1;
2568         m->store_at = SCTP_SIGNATURE_SIZE;
2569         SCTP_READ_RANDOM(m->random_numbers, sizeof(m->random_numbers));
2570         sctp_fill_random_store(m);
2571
2572         /* Minimum cookie size */
2573         m->size_of_a_cookie = (sizeof(struct sctp_init_msg) * 2) +
2574             sizeof(struct sctp_state_cookie);
2575         m->size_of_a_cookie += SCTP_SIGNATURE_SIZE;
2576
2577         /* Setup the initial secret */
2578         (void)SCTP_GETTIME_TIMEVAL(&time);
2579         m->time_of_secret_change = time.tv_sec;
2580
2581         for (i = 0; i < SCTP_NUMBER_OF_SECRETS; i++) {
2582                 m->secret_key[0][i] = sctp_select_initial_TSN(m);
2583         }
2584         sctp_timer_start(SCTP_TIMER_TYPE_NEWCOOKIE, inp, NULL, NULL);
2585
2586         /* How long is a cookie good for ? */
2587         m->def_cookie_life = sctp_msecs_to_ticks(SCTP_BASE_SYSCTL(sctp_valid_cookie_life_default));
2588         /*
2589          * Initialize authentication parameters
2590          */
2591         m->local_hmacs = sctp_default_supported_hmaclist();
2592         m->local_auth_chunks = sctp_alloc_chunklist();
2593         if (inp->asconf_supported) {
2594                 sctp_auth_add_chunk(SCTP_ASCONF, m->local_auth_chunks);
2595                 sctp_auth_add_chunk(SCTP_ASCONF_ACK, m->local_auth_chunks);
2596         }
2597         m->default_dscp = 0;
2598 #ifdef INET6
2599         m->default_flowlabel = 0;
2600 #endif
2601         m->port = 0;            /* encapsulation disabled by default */
2602         LIST_INIT(&m->shared_keys);
2603         /* add default NULL key as key id 0 */
2604         null_key = sctp_alloc_sharedkey();
2605         sctp_insert_sharedkey(&m->shared_keys, null_key);
2606         SCTP_INP_WUNLOCK(inp);
2607 #ifdef SCTP_LOG_CLOSING
2608         sctp_log_closing(inp, NULL, 12);
2609 #endif
2610         return (error);
2611 }
2612
2613 void
2614 sctp_move_pcb_and_assoc(struct sctp_inpcb *old_inp, struct sctp_inpcb *new_inp,
2615     struct sctp_tcb *stcb)
2616 {
2617         struct sctp_nets *net;
2618         uint16_t lport, rport;
2619         struct sctppcbhead *head;
2620         struct sctp_laddr *laddr, *oladdr;
2621
2622         atomic_add_int(&stcb->asoc.refcnt, 1);
2623         SCTP_TCB_UNLOCK(stcb);
2624         SCTP_INP_INFO_WLOCK();
2625         SCTP_INP_WLOCK(old_inp);
2626         SCTP_INP_WLOCK(new_inp);
2627         SCTP_TCB_LOCK(stcb);
2628         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2629
2630         new_inp->sctp_ep.time_of_secret_change =
2631             old_inp->sctp_ep.time_of_secret_change;
2632         memcpy(new_inp->sctp_ep.secret_key, old_inp->sctp_ep.secret_key,
2633             sizeof(old_inp->sctp_ep.secret_key));
2634         new_inp->sctp_ep.current_secret_number =
2635             old_inp->sctp_ep.current_secret_number;
2636         new_inp->sctp_ep.last_secret_number =
2637             old_inp->sctp_ep.last_secret_number;
2638         new_inp->sctp_ep.size_of_a_cookie = old_inp->sctp_ep.size_of_a_cookie;
2639
2640         /* make it so new data pours into the new socket */
2641         stcb->sctp_socket = new_inp->sctp_socket;
2642         stcb->sctp_ep = new_inp;
2643
2644         /* Copy the port across */
2645         lport = new_inp->sctp_lport = old_inp->sctp_lport;
2646         rport = stcb->rport;
2647         /* Pull the tcb from the old association */
2648         LIST_REMOVE(stcb, sctp_tcbhash);
2649         LIST_REMOVE(stcb, sctp_tcblist);
2650         if (stcb->asoc.in_asocid_hash) {
2651                 LIST_REMOVE(stcb, sctp_tcbasocidhash);
2652         }
2653         /* Now insert the new_inp into the TCP connected hash */
2654         head = &SCTP_BASE_INFO(sctp_tcpephash)[SCTP_PCBHASH_ALLADDR((lport | rport), SCTP_BASE_INFO(hashtcpmark))];
2655
2656         LIST_INSERT_HEAD(head, new_inp, sctp_hash);
2657         /* Its safe to access */
2658         new_inp->sctp_flags &= ~SCTP_PCB_FLAGS_UNBOUND;
2659
2660         /* Now move the tcb into the endpoint list */
2661         LIST_INSERT_HEAD(&new_inp->sctp_asoc_list, stcb, sctp_tcblist);
2662         /*
2663          * Question, do we even need to worry about the ep-hash since we
2664          * only have one connection? Probably not :> so lets get rid of it
2665          * and not suck up any kernel memory in that.
2666          */
2667         if (stcb->asoc.in_asocid_hash) {
2668                 struct sctpasochead *lhd;
2669
2670                 lhd = &new_inp->sctp_asocidhash[SCTP_PCBHASH_ASOC(stcb->asoc.assoc_id,
2671                     new_inp->hashasocidmark)];
2672                 LIST_INSERT_HEAD(lhd, stcb, sctp_tcbasocidhash);
2673         }
2674         /* Ok. Let's restart timer. */
2675         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
2676                 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, new_inp,
2677                     stcb, net);
2678         }
2679
2680         SCTP_INP_INFO_WUNLOCK();
2681         if (new_inp->sctp_tcbhash != NULL) {
2682                 SCTP_HASH_FREE(new_inp->sctp_tcbhash, new_inp->sctp_hashmark);
2683                 new_inp->sctp_tcbhash = NULL;
2684         }
2685         if ((new_inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) == 0) {
2686                 /* Subset bound, so copy in the laddr list from the old_inp */
2687                 LIST_FOREACH(oladdr, &old_inp->sctp_addr_list, sctp_nxt_addr) {
2688                         laddr = SCTP_ZONE_GET(SCTP_BASE_INFO(ipi_zone_laddr), struct sctp_laddr);
2689                         if (laddr == NULL) {
2690                                 /*
2691                                  * Gak, what can we do? This assoc is really
2692                                  * HOSED. We probably should send an abort
2693                                  * here.
2694                                  */
2695                                 SCTPDBG(SCTP_DEBUG_PCB1, "Association hosed in TCP model, out of laddr memory\n");
2696                                 continue;
2697                         }
2698                         SCTP_INCR_LADDR_COUNT();
2699                         memset(laddr, 0, sizeof(*laddr));
2700                         (void)SCTP_GETTIME_TIMEVAL(&laddr->start_time);
2701                         laddr->ifa = oladdr->ifa;
2702                         atomic_add_int(&laddr->ifa->refcount, 1);
2703                         LIST_INSERT_HEAD(&new_inp->sctp_addr_list, laddr,
2704                             sctp_nxt_addr);
2705                         new_inp->laddr_count++;
2706                         if (oladdr == stcb->asoc.last_used_address) {
2707                                 stcb->asoc.last_used_address = laddr;
2708                         }
2709                 }
2710         }
2711         /* Now any running timers need to be adjusted. */
2712         if (stcb->asoc.dack_timer.ep == old_inp) {
2713                 SCTP_INP_DECR_REF(old_inp);
2714                 stcb->asoc.dack_timer.ep = new_inp;
2715                 SCTP_INP_INCR_REF(new_inp);
2716         }
2717         if (stcb->asoc.asconf_timer.ep == old_inp) {
2718                 SCTP_INP_DECR_REF(old_inp);
2719                 stcb->asoc.asconf_timer.ep = new_inp;
2720                 SCTP_INP_INCR_REF(new_inp);
2721         }
2722         if (stcb->asoc.strreset_timer.ep == old_inp) {
2723                 SCTP_INP_DECR_REF(old_inp);
2724                 stcb->asoc.strreset_timer.ep = new_inp;
2725                 SCTP_INP_INCR_REF(new_inp);
2726         }
2727         if (stcb->asoc.shut_guard_timer.ep == old_inp) {
2728                 SCTP_INP_DECR_REF(old_inp);
2729                 stcb->asoc.shut_guard_timer.ep = new_inp;
2730                 SCTP_INP_INCR_REF(new_inp);
2731         }
2732         if (stcb->asoc.autoclose_timer.ep == old_inp) {
2733                 SCTP_INP_DECR_REF(old_inp);
2734                 stcb->asoc.autoclose_timer.ep = new_inp;
2735                 SCTP_INP_INCR_REF(new_inp);
2736         }
2737         if (stcb->asoc.delete_prim_timer.ep == old_inp) {
2738                 SCTP_INP_DECR_REF(old_inp);
2739                 stcb->asoc.delete_prim_timer.ep = new_inp;
2740                 SCTP_INP_INCR_REF(new_inp);
2741         }
2742         /* now what about the nets? */
2743         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
2744                 if (net->pmtu_timer.ep == old_inp) {
2745                         SCTP_INP_DECR_REF(old_inp);
2746                         net->pmtu_timer.ep = new_inp;
2747                         SCTP_INP_INCR_REF(new_inp);
2748                 }
2749                 if (net->hb_timer.ep == old_inp) {
2750                         SCTP_INP_DECR_REF(old_inp);
2751                         net->hb_timer.ep = new_inp;
2752                         SCTP_INP_INCR_REF(new_inp);
2753                 }
2754                 if (net->rxt_timer.ep == old_inp) {
2755                         SCTP_INP_DECR_REF(old_inp);
2756                         net->rxt_timer.ep = new_inp;
2757                         SCTP_INP_INCR_REF(new_inp);
2758                 }
2759         }
2760         SCTP_INP_WUNLOCK(new_inp);
2761         SCTP_INP_WUNLOCK(old_inp);
2762 }
2763
2764 /*
2765  * insert an laddr entry with the given ifa for the desired list
2766  */
2767 static int
2768 sctp_insert_laddr(struct sctpladdr *list, struct sctp_ifa *ifa, uint32_t act)
2769 {
2770         struct sctp_laddr *laddr;
2771
2772         laddr = SCTP_ZONE_GET(SCTP_BASE_INFO(ipi_zone_laddr), struct sctp_laddr);
2773         if (laddr == NULL) {
2774                 /* out of memory? */
2775                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_PCB, EINVAL);
2776                 return (EINVAL);
2777         }
2778         SCTP_INCR_LADDR_COUNT();
2779         memset(laddr, 0, sizeof(*laddr));
2780         (void)SCTP_GETTIME_TIMEVAL(&laddr->start_time);
2781         laddr->ifa = ifa;
2782         laddr->action = act;
2783         atomic_add_int(&ifa->refcount, 1);
2784         /* insert it */
2785         LIST_INSERT_HEAD(list, laddr, sctp_nxt_addr);
2786
2787         return (0);
2788 }
2789
2790 /*
2791  * Remove an laddr entry from the local address list (on an assoc)
2792  */
2793 static void
2794 sctp_remove_laddr(struct sctp_laddr *laddr)
2795 {
2796
2797         /* remove from the list */
2798         LIST_REMOVE(laddr, sctp_nxt_addr);
2799         sctp_free_ifa(laddr->ifa);
2800         SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_laddr), laddr);
2801         SCTP_DECR_LADDR_COUNT();
2802 }
2803
2804 /*
2805  * Bind the socket, with the PCB and global info locks held.  Note, if a
2806  * socket address is specified, the PCB lock may be dropped and re-acquired.
2807  *
2808  * sctp_ifap is used to bypass normal local address validation checks.
2809  */
2810 int
2811 sctp_inpcb_bind_locked(struct sctp_inpcb *inp, struct sockaddr *addr,
2812     struct sctp_ifa *sctp_ifap, struct thread *td)
2813 {
2814         /* bind a ep to a socket address */
2815         struct sctppcbhead *head;
2816         struct sctp_inpcb *inp_tmp;
2817         struct inpcb *ip_inp;
2818         int port_reuse_active = 0;
2819         int bindall;
2820         uint16_t lport;
2821         int error;
2822         uint32_t vrf_id;
2823
2824         KASSERT(td != NULL, ("%s: null thread", __func__));
2825
2826         error = 0;
2827         lport = 0;
2828         bindall = 1;
2829         ip_inp = &inp->ip_inp.inp;
2830
2831         SCTP_INP_INFO_WLOCK_ASSERT();
2832         SCTP_INP_WLOCK_ASSERT(inp);
2833
2834 #ifdef SCTP_DEBUG
2835         if (addr) {
2836                 SCTPDBG(SCTP_DEBUG_PCB1, "Bind called port: %d\n",
2837                     ntohs(((struct sockaddr_in *)addr)->sin_port));
2838                 SCTPDBG(SCTP_DEBUG_PCB1, "Addr: ");
2839                 SCTPDBG_ADDR(SCTP_DEBUG_PCB1, addr);
2840         }
2841 #endif
2842         if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) == 0) {
2843                 error = EINVAL;
2844                 /* already did a bind, subsequent binds NOT allowed ! */
2845                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, error);
2846                 goto out;
2847         }
2848         if (addr != NULL) {
2849                 switch (addr->sa_family) {
2850 #ifdef INET
2851                 case AF_INET:
2852                         {
2853                                 struct sockaddr_in *sin;
2854
2855                                 /* IPV6_V6ONLY socket? */
2856                                 if (SCTP_IPV6_V6ONLY(inp)) {
2857                                         error = EINVAL;
2858                                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, error);
2859                                         goto out;
2860                                 }
2861                                 if (addr->sa_len != sizeof(*sin)) {
2862                                         error = EINVAL;
2863                                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, error);
2864                                         goto out;
2865                                 }
2866
2867                                 sin = (struct sockaddr_in *)addr;
2868                                 lport = sin->sin_port;
2869                                 /*
2870                                  * For LOOPBACK the prison_local_ip4() call
2871                                  * will transmute the ip address to the
2872                                  * proper value.
2873                                  */
2874                                 if ((error = prison_local_ip4(td->td_ucred, &sin->sin_addr)) != 0) {
2875                                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, error);
2876                                         goto out;
2877                                 }
2878                                 if (sin->sin_addr.s_addr != INADDR_ANY) {
2879                                         bindall = 0;
2880                                 }
2881                                 break;
2882                         }
2883 #endif
2884 #ifdef INET6
2885                 case AF_INET6:
2886                         {
2887                                 /*
2888                                  * Only for pure IPv6 Address. (No IPv4
2889                                  * Mapped!)
2890                                  */
2891                                 struct sockaddr_in6 *sin6;
2892
2893                                 sin6 = (struct sockaddr_in6 *)addr;
2894                                 if (addr->sa_len != sizeof(*sin6)) {
2895                                         error = EINVAL;
2896                                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, error);
2897                                         goto out;
2898                                 }
2899                                 lport = sin6->sin6_port;
2900                                 /*
2901                                  * For LOOPBACK the prison_local_ip6() call
2902                                  * will transmute the ipv6 address to the
2903                                  * proper value.
2904                                  */
2905                                 if ((error = prison_local_ip6(td->td_ucred, &sin6->sin6_addr,
2906                                     (SCTP_IPV6_V6ONLY(inp) != 0))) != 0) {
2907                                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, error);
2908                                         goto out;
2909                                 }
2910                                 if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
2911                                         bindall = 0;
2912                                         /* KAME hack: embed scopeid */
2913                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
2914                                                 error = EINVAL;
2915                                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, error);
2916                                                 goto out;
2917                                         }
2918                                 }
2919                                 /* this must be cleared for ifa_ifwithaddr() */
2920                                 sin6->sin6_scope_id = 0;
2921                                 break;
2922                         }
2923 #endif
2924                 default:
2925                         error = EAFNOSUPPORT;
2926                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, error);
2927                         goto out;
2928                 }
2929         }
2930         /* Setup a vrf_id to be the default for the non-bind-all case. */
2931         vrf_id = inp->def_vrf_id;
2932
2933         if (lport) {
2934                 /*
2935                  * Did the caller specify a port? if so we must see if an ep
2936                  * already has this one bound.
2937                  */
2938                 /* got to be root to get at low ports */
2939                 if (ntohs(lport) < IPPORT_RESERVED &&
2940                     (error = priv_check(td, PRIV_NETINET_RESERVEDPORT)) != 0) {
2941                         goto out;
2942                 }
2943                 SCTP_INP_INCR_REF(inp);
2944                 SCTP_INP_WUNLOCK(inp);
2945                 if (bindall) {
2946                         vrf_id = inp->def_vrf_id;
2947                         inp_tmp = sctp_pcb_findep(addr, 0, 1, vrf_id);
2948                         if (inp_tmp != NULL) {
2949                                 /*
2950                                  * lock guy returned and lower count note
2951                                  * that we are not bound so inp_tmp should
2952                                  * NEVER be inp. And it is this inp
2953                                  * (inp_tmp) that gets the reference bump,
2954                                  * so we must lower it.
2955                                  */
2956                                 SCTP_INP_DECR_REF(inp_tmp);
2957                                 /* unlock info */
2958                                 if ((sctp_is_feature_on(inp, SCTP_PCB_FLAGS_PORTREUSE)) &&
2959                                     (sctp_is_feature_on(inp_tmp, SCTP_PCB_FLAGS_PORTREUSE))) {
2960                                         /*
2961                                          * Ok, must be one-2-one and
2962                                          * allowing port re-use
2963                                          */
2964                                         port_reuse_active = 1;
2965                                         goto continue_anyway;
2966                                 }
2967                                 SCTP_INP_WLOCK(inp);
2968                                 SCTP_INP_DECR_REF(inp);
2969                                 error = EADDRINUSE;
2970                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, error);
2971                                 goto out;
2972                         }
2973                 } else {
2974                         inp_tmp = sctp_pcb_findep(addr, 0, 1, vrf_id);
2975                         if (inp_tmp != NULL) {
2976                                 /*
2977                                  * lock guy returned and lower count note
2978                                  * that we are not bound so inp_tmp should
2979                                  * NEVER be inp. And it is this inp
2980                                  * (inp_tmp) that gets the reference bump,
2981                                  * so we must lower it.
2982                                  */
2983                                 SCTP_INP_DECR_REF(inp_tmp);
2984                                 /* unlock info */
2985                                 if ((sctp_is_feature_on(inp, SCTP_PCB_FLAGS_PORTREUSE)) &&
2986                                     (sctp_is_feature_on(inp_tmp, SCTP_PCB_FLAGS_PORTREUSE))) {
2987                                         /*
2988                                          * Ok, must be one-2-one and
2989                                          * allowing port re-use
2990                                          */
2991                                         port_reuse_active = 1;
2992                                         goto continue_anyway;
2993                                 }
2994                                 SCTP_INP_WLOCK(inp);
2995                                 SCTP_INP_DECR_REF(inp);
2996                                 error = EADDRINUSE;
2997                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, error);
2998                                 goto out;
2999                         }
3000                 }
3001 continue_anyway:
3002                 SCTP_INP_WLOCK(inp);
3003                 SCTP_INP_DECR_REF(inp);
3004                 if (bindall) {
3005                         /* verify that no lport is not used by a singleton */
3006                         if ((port_reuse_active == 0) &&
3007                             (inp_tmp = sctp_isport_inuse(inp, lport, vrf_id))) {
3008                                 /* Sorry someone already has this one bound */
3009                                 if ((sctp_is_feature_on(inp, SCTP_PCB_FLAGS_PORTREUSE)) &&
3010                                     (sctp_is_feature_on(inp_tmp, SCTP_PCB_FLAGS_PORTREUSE))) {
3011                                         port_reuse_active = 1;
3012                                 } else {
3013                                         error = EADDRINUSE;
3014                                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, error);
3015                                         goto out;
3016                                 }
3017                         }
3018                 }
3019         } else {
3020                 uint16_t first, last, candidate;
3021                 uint16_t count;
3022
3023                 if (ip_inp->inp_flags & INP_HIGHPORT) {
3024                         first = MODULE_GLOBAL(ipport_hifirstauto);
3025                         last = MODULE_GLOBAL(ipport_hilastauto);
3026                 } else if (ip_inp->inp_flags & INP_LOWPORT) {
3027                         if ((error = priv_check(td, PRIV_NETINET_RESERVEDPORT)) != 0) {
3028                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, error);
3029                                 goto out;
3030                         }
3031                         first = MODULE_GLOBAL(ipport_lowfirstauto);
3032                         last = MODULE_GLOBAL(ipport_lowlastauto);
3033                 } else {
3034                         first = MODULE_GLOBAL(ipport_firstauto);
3035                         last = MODULE_GLOBAL(ipport_lastauto);
3036                 }
3037                 if (first > last) {
3038                         uint16_t temp;
3039
3040                         temp = first;
3041                         first = last;
3042                         last = temp;
3043                 }
3044                 count = last - first + 1;       /* number of candidates */
3045                 candidate = first + sctp_select_initial_TSN(&inp->sctp_ep) % (count);
3046
3047                 for (;;) {
3048                         if (sctp_isport_inuse(inp, htons(candidate), inp->def_vrf_id) == NULL) {
3049                                 lport = htons(candidate);
3050                                 break;
3051                         }
3052                         if (--count == 0) {
3053                                 error = EADDRINUSE;
3054                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, error);
3055                                 goto out;
3056                         }
3057                         if (candidate == last)
3058                                 candidate = first;
3059                         else
3060                                 candidate = candidate + 1;
3061                 }
3062         }
3063         if (inp->sctp_flags & (SCTP_PCB_FLAGS_SOCKET_GONE |
3064             SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
3065                 /*
3066                  * this really should not happen. The guy did a non-blocking
3067                  * bind and then did a close at the same time.
3068                  */
3069                 error = EINVAL;
3070                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, error);
3071                 goto out;
3072         }
3073         /* ok we look clear to give out this port, so lets setup the binding */
3074         if (bindall) {
3075                 /* binding to all addresses, so just set in the proper flags */
3076                 inp->sctp_flags |= SCTP_PCB_FLAGS_BOUNDALL;
3077                 /* set the automatic addr changes from kernel flag */
3078                 if (SCTP_BASE_SYSCTL(sctp_auto_asconf) == 0) {
3079                         sctp_feature_off(inp, SCTP_PCB_FLAGS_DO_ASCONF);
3080                         sctp_feature_off(inp, SCTP_PCB_FLAGS_AUTO_ASCONF);
3081                 } else {
3082                         sctp_feature_on(inp, SCTP_PCB_FLAGS_DO_ASCONF);
3083                         sctp_feature_on(inp, SCTP_PCB_FLAGS_AUTO_ASCONF);
3084                 }
3085                 if (SCTP_BASE_SYSCTL(sctp_multiple_asconfs) == 0) {
3086                         sctp_feature_off(inp, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS);
3087                 } else {
3088                         sctp_feature_on(inp, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS);
3089                 }
3090                 /*
3091                  * set the automatic mobility_base from kernel flag (by
3092                  * micchie)
3093                  */
3094                 if (SCTP_BASE_SYSCTL(sctp_mobility_base) == 0) {
3095                         sctp_mobility_feature_off(inp, SCTP_MOBILITY_BASE);
3096                         sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
3097                 } else {
3098                         sctp_mobility_feature_on(inp, SCTP_MOBILITY_BASE);
3099                         sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
3100                 }
3101                 /*
3102                  * set the automatic mobility_fasthandoff from kernel flag
3103                  * (by micchie)
3104                  */
3105                 if (SCTP_BASE_SYSCTL(sctp_mobility_fasthandoff) == 0) {
3106                         sctp_mobility_feature_off(inp, SCTP_MOBILITY_FASTHANDOFF);
3107                         sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
3108                 } else {
3109                         sctp_mobility_feature_on(inp, SCTP_MOBILITY_FASTHANDOFF);
3110                         sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
3111                 }
3112         } else {
3113                 /*
3114                  * bind specific, make sure flags is off and add a new
3115                  * address structure to the sctp_addr_list inside the ep
3116                  * structure.
3117                  *
3118                  * We will need to allocate one and insert it at the head.
3119                  * The socketopt call can just insert new addresses in there
3120                  * as well. It will also have to do the embed scope kame
3121                  * hack too (before adding).
3122                  */
3123                 struct sctp_ifa *ifa;
3124                 union sctp_sockstore store;
3125
3126                 memset(&store, 0, sizeof(store));
3127                 switch (addr->sa_family) {
3128 #ifdef INET
3129                 case AF_INET:
3130                         memcpy(&store.sin, addr, sizeof(struct sockaddr_in));
3131                         store.sin.sin_port = 0;
3132                         break;
3133 #endif
3134 #ifdef INET6
3135                 case AF_INET6:
3136                         memcpy(&store.sin6, addr, sizeof(struct sockaddr_in6));
3137                         store.sin6.sin6_port = 0;
3138                         break;
3139 #endif
3140                 default:
3141                         break;
3142                 }
3143                 /*
3144                  * first find the interface with the bound address need to
3145                  * zero out the port to find the address! yuck! can't do
3146                  * this earlier since need port for sctp_pcb_findep()
3147                  */
3148                 if (sctp_ifap != NULL) {
3149                         ifa = sctp_ifap;
3150                 } else {
3151                         /*
3152                          * Note for BSD we hit here always other O/S's will
3153                          * pass things in via the sctp_ifap argument.
3154                          */
3155                         ifa = sctp_find_ifa_by_addr(&store.sa,
3156                             vrf_id, SCTP_ADDR_NOT_LOCKED);
3157                 }
3158                 if (ifa == NULL) {
3159                         error = EADDRNOTAVAIL;
3160                         /* Can't find an interface with that address */
3161                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, error);
3162                         goto out;
3163                 }
3164 #ifdef INET6
3165                 if (addr->sa_family == AF_INET6) {
3166                         /* GAK, more FIXME IFA lock? */
3167                         if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
3168                                 /* Can't bind a non-existent addr. */
3169                                 error = EINVAL;
3170                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, error);
3171                                 goto out;
3172                         }
3173                 }
3174 #endif
3175                 /* we're not bound all */
3176                 inp->sctp_flags &= ~SCTP_PCB_FLAGS_BOUNDALL;
3177                 /* allow bindx() to send ASCONF's for binding changes */
3178                 sctp_feature_on(inp, SCTP_PCB_FLAGS_DO_ASCONF);
3179                 /* clear automatic addr changes from kernel flag */
3180                 sctp_feature_off(inp, SCTP_PCB_FLAGS_AUTO_ASCONF);
3181
3182                 /* add this address to the endpoint list */
3183                 error = sctp_insert_laddr(&inp->sctp_addr_list, ifa, 0);
3184                 if (error != 0)
3185                         goto out;
3186                 inp->laddr_count++;
3187         }
3188         /* find the bucket */
3189         if (port_reuse_active) {
3190                 /* Put it into tcp 1-2-1 hash */
3191                 head = &SCTP_BASE_INFO(sctp_tcpephash)[SCTP_PCBHASH_ALLADDR(lport, SCTP_BASE_INFO(hashtcpmark))];
3192                 inp->sctp_flags |= SCTP_PCB_FLAGS_IN_TCPPOOL;
3193         } else {
3194                 head = &SCTP_BASE_INFO(sctp_ephash)[SCTP_PCBHASH_ALLADDR(lport, SCTP_BASE_INFO(hashmark))];
3195         }
3196         /* put it in the bucket */
3197         LIST_INSERT_HEAD(head, inp, sctp_hash);
3198         SCTPDBG(SCTP_DEBUG_PCB1, "Main hash to bind at head:%p, bound port:%d - in tcp_pool=%d\n",
3199             (void *)head, ntohs(lport), port_reuse_active);
3200         /* set in the port */
3201         inp->sctp_lport = lport;
3202
3203         /* turn off just the unbound flag */
3204         KASSERT((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) != 0,
3205             ("%s: inp %p is already bound", __func__, inp));
3206         inp->sctp_flags &= ~SCTP_PCB_FLAGS_UNBOUND;
3207 out:
3208         return (error);
3209 }
3210
3211 int
3212 sctp_inpcb_bind(struct socket *so, struct sockaddr *addr,
3213     struct sctp_ifa *sctp_ifap, struct thread *td)
3214 {
3215         struct sctp_inpcb *inp;
3216         int error;
3217
3218         inp = so->so_pcb;
3219         SCTP_INP_INFO_WLOCK();
3220         SCTP_INP_WLOCK(inp);
3221         error = sctp_inpcb_bind_locked(inp, addr, sctp_ifap, td);
3222         SCTP_INP_WUNLOCK(inp);
3223         SCTP_INP_INFO_WUNLOCK();
3224         return (error);
3225 }
3226
3227 static void
3228 sctp_iterator_inp_being_freed(struct sctp_inpcb *inp)
3229 {
3230         struct sctp_iterator *it, *nit;
3231
3232         /*
3233          * We enter with the only the ITERATOR_LOCK in place and a write
3234          * lock on the inp_info stuff.
3235          */
3236         it = sctp_it_ctl.cur_it;
3237         if (it && (it->vn != curvnet)) {
3238                 /* Its not looking at our VNET */
3239                 return;
3240         }
3241         if (it && (it->inp == inp)) {
3242                 /*
3243                  * This is tricky and we hold the iterator lock, but when it
3244                  * returns and gets the lock (when we release it) the
3245                  * iterator will try to operate on inp. We need to stop that
3246                  * from happening. But of course the iterator has a
3247                  * reference on the stcb and inp. We can mark it and it will
3248                  * stop.
3249                  *
3250                  * If its a single iterator situation, we set the end
3251                  * iterator flag. Otherwise we set the iterator to go to the
3252                  * next inp.
3253                  *
3254                  */
3255                 if (it->iterator_flags & SCTP_ITERATOR_DO_SINGLE_INP) {
3256                         sctp_it_ctl.iterator_flags |= SCTP_ITERATOR_STOP_CUR_IT;
3257                 } else {
3258                         sctp_it_ctl.iterator_flags |= SCTP_ITERATOR_STOP_CUR_INP;
3259                 }
3260         }
3261         /*
3262          * Now go through and remove any single reference to our inp that
3263          * may be still pending on the list
3264          */
3265         SCTP_IPI_ITERATOR_WQ_LOCK();
3266         TAILQ_FOREACH_SAFE(it, &sctp_it_ctl.iteratorhead, sctp_nxt_itr, nit) {
3267                 if (it->vn != curvnet) {
3268                         continue;
3269                 }
3270                 if (it->inp == inp) {
3271                         /* This one points to me is it inp specific? */
3272                         if (it->iterator_flags & SCTP_ITERATOR_DO_SINGLE_INP) {
3273                                 /* Remove and free this one */
3274                                 TAILQ_REMOVE(&sctp_it_ctl.iteratorhead,
3275                                     it, sctp_nxt_itr);
3276                                 if (it->function_atend != NULL) {
3277                                         (*it->function_atend) (it->pointer, it->val);
3278                                 }
3279                                 SCTP_FREE(it, SCTP_M_ITER);
3280                         } else {
3281                                 it->inp = LIST_NEXT(it->inp, sctp_list);
3282                                 if (it->inp) {
3283                                         SCTP_INP_INCR_REF(it->inp);
3284                                 }
3285                         }
3286                         /*
3287                          * When its put in the refcnt is incremented so decr
3288                          * it
3289                          */
3290                         SCTP_INP_DECR_REF(inp);
3291                 }
3292         }
3293         SCTP_IPI_ITERATOR_WQ_UNLOCK();
3294 }
3295
3296 /* release sctp_inpcb unbind the port */
3297 void
3298 sctp_inpcb_free(struct sctp_inpcb *inp, int immediate, int from)
3299 {
3300         /*
3301          * Here we free a endpoint. We must find it (if it is in the Hash
3302          * table) and remove it from there. Then we must also find it in the
3303          * overall list and remove it from there. After all removals are
3304          * complete then any timer has to be stopped. Then start the actual
3305          * freeing. a) Any local lists. b) Any associations. c) The hash of
3306          * all associations. d) finally the ep itself.
3307          */
3308         struct sctp_tcb *asoc, *nasoc;
3309         struct sctp_laddr *laddr, *nladdr;
3310         struct inpcb *ip_pcb;
3311         struct socket *so;
3312         int being_refed = 0;
3313         struct sctp_queued_to_read *sq, *nsq;
3314         int cnt;
3315         sctp_sharedkey_t *shared_key, *nshared_key;
3316
3317 #ifdef SCTP_LOG_CLOSING
3318         sctp_log_closing(inp, NULL, 0);
3319 #endif
3320         SCTP_ITERATOR_LOCK();
3321         /* mark any iterators on the list or being processed */
3322         sctp_iterator_inp_being_freed(inp);
3323         SCTP_ITERATOR_UNLOCK();
3324
3325         SCTP_ASOC_CREATE_LOCK(inp);
3326         SCTP_INP_INFO_WLOCK();
3327         SCTP_INP_WLOCK(inp);
3328         so = inp->sctp_socket;
3329         KASSERT((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) != 0,
3330             ("%s: inp %p still has socket", __func__, inp));
3331         KASSERT((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) == 0,
3332             ("%s: double free of inp %p", __func__, inp));
3333         if (from == SCTP_CALLED_AFTER_CMPSET_OFCLOSE) {
3334                 inp->sctp_flags &= ~SCTP_PCB_FLAGS_CLOSE_IP;
3335                 /* socket is gone, so no more wakeups allowed */
3336                 inp->sctp_flags |= SCTP_PCB_FLAGS_DONT_WAKE;
3337                 inp->sctp_flags &= ~SCTP_PCB_FLAGS_WAKEINPUT;
3338                 inp->sctp_flags &= ~SCTP_PCB_FLAGS_WAKEOUTPUT;
3339         }
3340         /* First time through we have the socket lock, after that no more. */
3341         sctp_timer_stop(SCTP_TIMER_TYPE_NEWCOOKIE, inp, NULL, NULL,
3342             SCTP_FROM_SCTP_PCB + SCTP_LOC_1);
3343
3344         if (inp->control) {
3345                 sctp_m_freem(inp->control);
3346                 inp->control = NULL;
3347         }
3348         if (inp->pkt) {
3349                 sctp_m_freem(inp->pkt);
3350                 inp->pkt = NULL;
3351         }
3352         ip_pcb = &inp->ip_inp.inp;      /* we could just cast the main pointer
3353                                          * here but I will be nice :> (i.e.
3354                                          * ip_pcb = ep;) */
3355         if (immediate == SCTP_FREE_SHOULD_USE_GRACEFUL_CLOSE) {
3356                 int cnt_in_sd;
3357
3358                 cnt_in_sd = 0;
3359                 LIST_FOREACH_SAFE(asoc, &inp->sctp_asoc_list, sctp_tcblist, nasoc) {
3360                         SCTP_TCB_LOCK(asoc);
3361                         if (asoc->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
3362                                 /* Skip guys being freed */
3363                                 cnt_in_sd++;
3364                                 if (asoc->asoc.state & SCTP_STATE_IN_ACCEPT_QUEUE) {
3365                                         /*
3366                                          * Special case - we did not start a
3367                                          * kill timer on the asoc due to it
3368                                          * was not closed. So go ahead and
3369                                          * start it now.
3370                                          */
3371                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_IN_ACCEPT_QUEUE);
3372                                         sctp_timer_start(SCTP_TIMER_TYPE_ASOCKILL, inp, asoc, NULL);
3373                                 }
3374                                 SCTP_TCB_UNLOCK(asoc);
3375                                 continue;
3376                         }
3377                         if (((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
3378                             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) &&
3379                             (asoc->asoc.total_output_queue_size == 0)) {
3380                                 /*
3381                                  * If we have data in queue, we don't want
3382                                  * to just free since the app may have done,
3383                                  * send()/close or connect/send/close. And
3384                                  * it wants the data to get across first.
3385                                  */
3386                                 /* Just abandon things in the front states */
3387                                 if (sctp_free_assoc(inp, asoc, SCTP_PCBFREE_NOFORCE,
3388                                     SCTP_FROM_SCTP_PCB + SCTP_LOC_2) == 0) {
3389                                         cnt_in_sd++;
3390                                 }
3391                                 continue;
3392                         }
3393                         /* Disconnect the socket please */
3394                         asoc->sctp_socket = NULL;
3395                         SCTP_ADD_SUBSTATE(asoc, SCTP_STATE_CLOSED_SOCKET);
3396                         if ((asoc->asoc.size_on_reasm_queue > 0) ||
3397                             (asoc->asoc.control_pdapi) ||
3398                             (asoc->asoc.size_on_all_streams > 0) ||
3399                             (so && (so->so_rcv.sb_cc > 0))) {
3400                                 /* Left with Data unread */
3401                                 struct mbuf *op_err;
3402
3403                                 op_err = sctp_generate_cause(SCTP_CAUSE_USER_INITIATED_ABT, "");
3404                                 asoc->sctp_ep->last_abort_code = SCTP_FROM_SCTP_PCB + SCTP_LOC_3;
3405                                 sctp_send_abort_tcb(asoc, op_err, SCTP_SO_LOCKED);
3406                                 SCTP_STAT_INCR_COUNTER32(sctps_aborted);
3407                                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
3408                                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
3409                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
3410                                 }
3411                                 if (sctp_free_assoc(inp, asoc,
3412                                     SCTP_PCBFREE_NOFORCE, SCTP_FROM_SCTP_PCB + SCTP_LOC_4) == 0) {
3413                                         cnt_in_sd++;
3414                                 }
3415                                 continue;
3416                         } else if (TAILQ_EMPTY(&asoc->asoc.send_queue) &&
3417                                     TAILQ_EMPTY(&asoc->asoc.sent_queue) &&
3418                             (asoc->asoc.stream_queue_cnt == 0)) {
3419                                 if ((*asoc->asoc.ss_functions.sctp_ss_is_user_msgs_incomplete) (asoc, &asoc->asoc)) {
3420                                         goto abort_anyway;
3421                                 }
3422                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
3423                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
3424                                         struct sctp_nets *netp;
3425
3426                                         /*
3427                                          * there is nothing queued to send,
3428                                          * so I send shutdown
3429                                          */
3430                                         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
3431                                             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
3432                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
3433                                         }
3434                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
3435                                         sctp_stop_timers_for_shutdown(asoc);
3436                                         if (asoc->asoc.alternate) {
3437                                                 netp = asoc->asoc.alternate;
3438                                         } else {
3439                                                 netp = asoc->asoc.primary_destination;
3440                                         }
3441                                         sctp_send_shutdown(asoc, netp);
3442                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, asoc->sctp_ep, asoc,
3443                                             netp);
3444                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, asoc->sctp_ep, asoc, NULL);
3445                                         sctp_chunk_output(inp, asoc, SCTP_OUTPUT_FROM_SHUT_TMR, SCTP_SO_LOCKED);
3446                                 }
3447                         } else {
3448                                 /* mark into shutdown pending */
3449                                 SCTP_ADD_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
3450                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, asoc->sctp_ep, asoc, NULL);
3451                                 if ((*asoc->asoc.ss_functions.sctp_ss_is_user_msgs_incomplete) (asoc, &asoc->asoc)) {
3452                                         SCTP_ADD_SUBSTATE(asoc, SCTP_STATE_PARTIAL_MSG_LEFT);
3453                                 }
3454                                 if (TAILQ_EMPTY(&asoc->asoc.send_queue) &&
3455                                     TAILQ_EMPTY(&asoc->asoc.sent_queue) &&
3456                                     (asoc->asoc.state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
3457                                         struct mbuf *op_err;
3458
3459                         abort_anyway:
3460                                         op_err = sctp_generate_cause(SCTP_CAUSE_USER_INITIATED_ABT, "");
3461                                         asoc->sctp_ep->last_abort_code = SCTP_FROM_SCTP_PCB + SCTP_LOC_5;
3462                                         sctp_send_abort_tcb(asoc, op_err, SCTP_SO_LOCKED);
3463                                         SCTP_STAT_INCR_COUNTER32(sctps_aborted);
3464                                         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
3465                                             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
3466                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
3467                                         }
3468                                         if (sctp_free_assoc(inp, asoc,
3469                                             SCTP_PCBFREE_NOFORCE,
3470                                             SCTP_FROM_SCTP_PCB + SCTP_LOC_6) == 0) {
3471                                                 cnt_in_sd++;
3472                                         }
3473                                         continue;
3474                                 } else {
3475                                         sctp_chunk_output(inp, asoc, SCTP_OUTPUT_FROM_CLOSING, SCTP_SO_LOCKED);
3476                                 }
3477                         }
3478                         cnt_in_sd++;
3479                         SCTP_TCB_UNLOCK(asoc);
3480                 }
3481                 /* now is there some left in our SHUTDOWN state? */
3482                 if (cnt_in_sd) {
3483 #ifdef SCTP_LOG_CLOSING
3484                         sctp_log_closing(inp, NULL, 2);
3485 #endif
3486                         inp->sctp_socket = NULL;
3487                         SCTP_INP_WUNLOCK(inp);
3488                         SCTP_ASOC_CREATE_UNLOCK(inp);
3489                         SCTP_INP_INFO_WUNLOCK();
3490                         return;
3491                 }
3492         }
3493         inp->sctp_socket = NULL;
3494         if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) !=
3495             SCTP_PCB_FLAGS_UNBOUND) {
3496                 /*
3497                  * ok, this guy has been bound. It's port is somewhere in
3498                  * the SCTP_BASE_INFO(hash table). Remove it!
3499                  */
3500                 LIST_REMOVE(inp, sctp_hash);
3501                 inp->sctp_flags |= SCTP_PCB_FLAGS_UNBOUND;
3502         }
3503
3504         /*
3505          * If there is a timer running to kill us, forget it, since it may
3506          * have a contest on the INP lock.. which would cause us to die ...
3507          */
3508         cnt = 0;
3509         LIST_FOREACH_SAFE(asoc, &inp->sctp_asoc_list, sctp_tcblist, nasoc) {
3510                 SCTP_TCB_LOCK(asoc);
3511                 if (immediate != SCTP_FREE_SHOULD_USE_GRACEFUL_CLOSE) {
3512                         /* Disconnect the socket please */
3513                         asoc->sctp_socket = NULL;
3514                         SCTP_ADD_SUBSTATE(asoc, SCTP_STATE_CLOSED_SOCKET);
3515                 }
3516                 if (asoc->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
3517                         if (asoc->asoc.state & SCTP_STATE_IN_ACCEPT_QUEUE) {
3518                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_IN_ACCEPT_QUEUE);
3519                                 sctp_timer_start(SCTP_TIMER_TYPE_ASOCKILL, inp, asoc, NULL);
3520                         }
3521                         cnt++;
3522                         SCTP_TCB_UNLOCK(asoc);
3523                         continue;
3524                 }
3525                 /* Free associations that are NOT killing us */
3526                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
3527                     ((asoc->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0)) {
3528                         struct mbuf *op_err;
3529
3530                         op_err = sctp_generate_cause(SCTP_CAUSE_USER_INITIATED_ABT, "");
3531                         asoc->sctp_ep->last_abort_code = SCTP_FROM_SCTP_PCB + SCTP_LOC_7;
3532                         sctp_send_abort_tcb(asoc, op_err, SCTP_SO_LOCKED);
3533                         SCTP_STAT_INCR_COUNTER32(sctps_aborted);
3534                 } else if (asoc->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
3535                         cnt++;
3536                         SCTP_TCB_UNLOCK(asoc);
3537                         continue;
3538                 }
3539                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
3540                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
3541                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
3542                 }
3543                 if (sctp_free_assoc(inp, asoc, SCTP_PCBFREE_FORCE,
3544                     SCTP_FROM_SCTP_PCB + SCTP_LOC_8) == 0) {
3545                         cnt++;
3546                 }
3547         }
3548         if (cnt) {
3549                 /* Ok we have someone out there that will kill us */
3550 #ifdef SCTP_LOG_CLOSING
3551                 sctp_log_closing(inp, NULL, 3);
3552 #endif
3553                 SCTP_INP_WUNLOCK(inp);
3554                 SCTP_ASOC_CREATE_UNLOCK(inp);
3555                 SCTP_INP_INFO_WUNLOCK();
3556                 return;
3557         }
3558         if (SCTP_INP_LOCK_CONTENDED(inp))
3559                 being_refed++;
3560         if (SCTP_INP_READ_CONTENDED(inp))
3561                 being_refed++;
3562         if (SCTP_ASOC_CREATE_LOCK_CONTENDED(inp))
3563                 being_refed++;
3564         /* NOTE: 0 refcount also means no timers are referencing us. */
3565         if ((inp->refcount) ||
3566             (being_refed) ||
3567             (inp->sctp_flags & SCTP_PCB_FLAGS_CLOSE_IP)) {
3568 #ifdef SCTP_LOG_CLOSING
3569                 sctp_log_closing(inp, NULL, 4);
3570 #endif
3571                 sctp_timer_start(SCTP_TIMER_TYPE_INPKILL, inp, NULL, NULL);
3572                 SCTP_INP_WUNLOCK(inp);
3573                 SCTP_ASOC_CREATE_UNLOCK(inp);
3574                 SCTP_INP_INFO_WUNLOCK();
3575                 return;
3576         }
3577         inp->sctp_ep.signature_change.type = 0;
3578         inp->sctp_flags |= SCTP_PCB_FLAGS_SOCKET_ALLGONE;
3579         /*
3580          * Remove it from the list .. last thing we need a lock for.
3581          */
3582         LIST_REMOVE(inp, sctp_list);
3583         SCTP_INP_WUNLOCK(inp);
3584         SCTP_ASOC_CREATE_UNLOCK(inp);
3585         SCTP_INP_INFO_WUNLOCK();
3586
3587 #ifdef SCTP_LOG_CLOSING
3588         sctp_log_closing(inp, NULL, 5);
3589 #endif
3590         if ((inp->sctp_asocidhash) != NULL) {
3591                 SCTP_HASH_FREE(inp->sctp_asocidhash, inp->hashasocidmark);
3592                 inp->sctp_asocidhash = NULL;
3593         }
3594         /* sa_ignore FREED_MEMORY */
3595         TAILQ_FOREACH_SAFE(sq, &inp->read_queue, next, nsq) {
3596                 /* Its only abandoned if it had data left */
3597                 if (sq->length)
3598                         SCTP_STAT_INCR(sctps_left_abandon);
3599
3600                 TAILQ_REMOVE(&inp->read_queue, sq, next);
3601                 sctp_free_remote_addr(sq->whoFrom);
3602                 if (so)
3603                         so->so_rcv.sb_cc -= sq->length;
3604                 if (sq->data) {
3605                         sctp_m_freem(sq->data);
3606                         sq->data = NULL;
3607                 }
3608                 /*
3609                  * no need to free the net count, since at this point all
3610                  * assoc's are gone.
3611                  */
3612                 sctp_free_a_readq(NULL, sq);
3613         }
3614         /* Now the sctp_pcb things */
3615         /*
3616          * free each asoc if it is not already closed/free. we can't use the
3617          * macro here since le_next will get freed as part of the
3618          * sctp_free_assoc() call.
3619          */
3620         if (ip_pcb->inp_options) {
3621                 (void)sctp_m_free(ip_pcb->inp_options);
3622                 ip_pcb->inp_options = 0;
3623         }
3624 #ifdef INET6
3625         if (ip_pcb->inp_vflag & INP_IPV6) {
3626                 ip6_freepcbopts(ip_pcb->in6p_outputopts);
3627         }
3628 #endif                          /* INET6 */
3629         ip_pcb->inp_vflag = 0;
3630         /* free up authentication fields */
3631         if (inp->sctp_ep.local_auth_chunks != NULL)
3632                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
3633         if (inp->sctp_ep.local_hmacs != NULL)
3634                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
3635
3636         LIST_FOREACH_SAFE(shared_key, &inp->sctp_ep.shared_keys, next, nshared_key) {
3637                 LIST_REMOVE(shared_key, next);
3638                 sctp_free_sharedkey(shared_key);
3639                 /* sa_ignore FREED_MEMORY */
3640         }
3641
3642         /*
3643          * if we have an address list the following will free the list of
3644          * ifaddr's that are set into this ep. Again macro limitations here,
3645          * since the LIST_FOREACH could be a bad idea.
3646          */
3647         LIST_FOREACH_SAFE(laddr, &inp->sctp_addr_list, sctp_nxt_addr, nladdr) {
3648                 sctp_remove_laddr(laddr);
3649         }
3650
3651 #ifdef SCTP_TRACK_FREED_ASOCS
3652         /* TEMP CODE */
3653         LIST_FOREACH_SAFE(asoc, &inp->sctp_asoc_free_list, sctp_tcblist, nasoc) {
3654                 LIST_REMOVE(asoc, sctp_tcblist);
3655                 SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_asoc), asoc);
3656                 SCTP_DECR_ASOC_COUNT();
3657         }
3658         /* *** END TEMP CODE *** */
3659 #endif
3660         /* Now lets see about freeing the EP hash table. */
3661         if (inp->sctp_tcbhash != NULL) {
3662                 SCTP_HASH_FREE(inp->sctp_tcbhash, inp->sctp_hashmark);
3663                 inp->sctp_tcbhash = NULL;
3664         }
3665         /* Now we must put the ep memory back into the zone pool */
3666         crfree(inp->ip_inp.inp.inp_cred);
3667         INP_LOCK_DESTROY(&inp->ip_inp.inp);
3668         SCTP_INP_LOCK_DESTROY(inp);
3669         SCTP_INP_READ_DESTROY(inp);
3670         SCTP_ASOC_CREATE_LOCK_DESTROY(inp);
3671         SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_ep), inp);
3672         SCTP_DECR_EP_COUNT();
3673 }
3674
3675 struct sctp_nets *
3676 sctp_findnet(struct sctp_tcb *stcb, struct sockaddr *addr)
3677 {
3678         struct sctp_nets *net;
3679
3680         /* locate the address */
3681         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
3682                 if (sctp_cmpaddr(addr, (struct sockaddr *)&net->ro._l_addr))
3683                         return (net);
3684         }
3685         return (NULL);
3686 }
3687
3688 int
3689 sctp_is_address_on_local_host(struct sockaddr *addr, uint32_t vrf_id)
3690 {
3691         struct sctp_ifa *sctp_ifa;
3692
3693         sctp_ifa = sctp_find_ifa_by_addr(addr, vrf_id, SCTP_ADDR_NOT_LOCKED);
3694         if (sctp_ifa) {
3695                 return (1);
3696         } else {
3697                 return (0);
3698         }
3699 }
3700
3701 /*
3702  * add's a remote endpoint address, done with the INIT/INIT-ACK as well as
3703  * when a ASCONF arrives that adds it. It will also initialize all the cwnd
3704  * stats of stuff.
3705  */
3706 int
3707 sctp_add_remote_addr(struct sctp_tcb *stcb, struct sockaddr *newaddr,
3708     struct sctp_nets **netp, uint16_t port, int set_scope, int from)
3709 {
3710         /*
3711          * The following is redundant to the same lines in the
3712          * sctp_aloc_assoc() but is needed since others call the add address
3713          * function
3714          */
3715         struct sctp_nets *net, *netfirst;
3716         int addr_inscope;
3717
3718         SCTPDBG(SCTP_DEBUG_PCB1, "Adding an address (from:%d) to the peer: ",
3719             from);
3720         SCTPDBG_ADDR(SCTP_DEBUG_PCB1, newaddr);
3721
3722         netfirst = sctp_findnet(stcb, newaddr);
3723         if (netfirst) {
3724                 /*
3725                  * Lie and return ok, we don't want to make the association
3726                  * go away for this behavior. It will happen in the TCP
3727                  * model in a connected socket. It does not reach the hash
3728                  * table until after the association is built so it can't be
3729                  * found. Mark as reachable, since the initial creation will
3730                  * have been cleared and the NOT_IN_ASSOC flag will have
3731                  * been added... and we don't want to end up removing it
3732                  * back out.
3733                  */
3734                 if (netfirst->dest_state & SCTP_ADDR_UNCONFIRMED) {
3735                         netfirst->dest_state = (SCTP_ADDR_REACHABLE |
3736                             SCTP_ADDR_UNCONFIRMED);
3737                 } else {
3738                         netfirst->dest_state = SCTP_ADDR_REACHABLE;
3739                 }
3740
3741                 return (0);
3742         }
3743         addr_inscope = 1;
3744         switch (newaddr->sa_family) {
3745 #ifdef INET
3746         case AF_INET:
3747                 {
3748                         struct sockaddr_in *sin;
3749
3750                         sin = (struct sockaddr_in *)newaddr;
3751                         if (sin->sin_addr.s_addr == 0) {
3752                                 /* Invalid address */
3753                                 return (-1);
3754                         }
3755                         /* zero out the zero area */
3756                         memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
3757
3758                         /* assure len is set */
3759                         sin->sin_len = sizeof(struct sockaddr_in);
3760                         if (set_scope) {
3761                                 if (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) {
3762                                         stcb->asoc.scope.ipv4_local_scope = 1;
3763                                 }
3764                         } else {
3765                                 /* Validate the address is in scope */
3766                                 if ((IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) &&
3767                                     (stcb->asoc.scope.ipv4_local_scope == 0)) {
3768                                         addr_inscope = 0;
3769                                 }
3770                         }
3771                         break;
3772                 }
3773 #endif
3774 #ifdef INET6
3775         case AF_INET6:
3776                 {
3777                         struct sockaddr_in6 *sin6;
3778
3779                         sin6 = (struct sockaddr_in6 *)newaddr;
3780                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
3781                                 /* Invalid address */
3782                                 return (-1);
3783                         }
3784                         /* assure len is set */
3785                         sin6->sin6_len = sizeof(struct sockaddr_in6);
3786                         if (set_scope) {
3787                                 if (sctp_is_address_on_local_host(newaddr, stcb->asoc.vrf_id)) {
3788                                         stcb->asoc.scope.loopback_scope = 1;
3789                                         stcb->asoc.scope.local_scope = 0;
3790                                         stcb->asoc.scope.ipv4_local_scope = 1;
3791                                         stcb->asoc.scope.site_scope = 1;
3792                                 } else if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
3793                                         /*
3794                                          * If the new destination is a
3795                                          * LINK_LOCAL we must have common
3796                                          * site scope. Don't set the local
3797                                          * scope since we may not share all
3798                                          * links, only loopback can do this.
3799                                          * Links on the local network would
3800                                          * also be on our private network
3801                                          * for v4 too.
3802                                          */
3803                                         stcb->asoc.scope.ipv4_local_scope = 1;
3804                                         stcb->asoc.scope.site_scope = 1;
3805                                 } else if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) {
3806                                         /*
3807                                          * If the new destination is
3808                                          * SITE_LOCAL then we must have site
3809                                          * scope in common.
3810                                          */
3811                                         stcb->asoc.scope.site_scope = 1;
3812                                 }
3813                         } else {
3814                                 /* Validate the address is in scope */
3815                                 if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr) &&
3816                                     (stcb->asoc.scope.loopback_scope == 0)) {
3817                                         addr_inscope = 0;
3818                                 } else if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) &&
3819                                     (stcb->asoc.scope.local_scope == 0)) {
3820                                         addr_inscope = 0;
3821                                 } else if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr) &&
3822                                     (stcb->asoc.scope.site_scope == 0)) {
3823                                         addr_inscope = 0;
3824                                 }
3825                         }
3826                         break;
3827                 }
3828 #endif
3829         default:
3830                 /* not supported family type */
3831                 return (-1);
3832         }
3833         net = SCTP_ZONE_GET(SCTP_BASE_INFO(ipi_zone_net), struct sctp_nets);
3834         if (net == NULL) {
3835                 return (-1);
3836         }
3837         SCTP_INCR_RADDR_COUNT();
3838         memset(net, 0, sizeof(struct sctp_nets));
3839         (void)SCTP_GETTIME_TIMEVAL(&net->start_time);
3840         memcpy(&net->ro._l_addr, newaddr, newaddr->sa_len);
3841         switch (newaddr->sa_family) {
3842 #ifdef INET
3843         case AF_INET:
3844                 ((struct sockaddr_in *)&net->ro._l_addr)->sin_port = stcb->rport;
3845                 break;
3846 #endif
3847 #ifdef INET6
3848         case AF_INET6:
3849                 ((struct sockaddr_in6 *)&net->ro._l_addr)->sin6_port = stcb->rport;
3850                 break;
3851 #endif
3852         default:
3853                 break;
3854         }
3855         net->addr_is_local = sctp_is_address_on_local_host(newaddr, stcb->asoc.vrf_id);
3856         if (net->addr_is_local && ((set_scope || (from == SCTP_ADDR_IS_CONFIRMED)))) {
3857                 stcb->asoc.scope.loopback_scope = 1;
3858                 stcb->asoc.scope.ipv4_local_scope = 1;
3859                 stcb->asoc.scope.local_scope = 0;
3860                 stcb->asoc.scope.site_scope = 1;
3861                 addr_inscope = 1;
3862         }
3863         net->failure_threshold = stcb->asoc.def_net_failure;
3864         net->pf_threshold = stcb->asoc.def_net_pf_threshold;
3865         if (addr_inscope == 0) {
3866                 net->dest_state = (SCTP_ADDR_REACHABLE |
3867                     SCTP_ADDR_OUT_OF_SCOPE);
3868         } else {
3869                 if (from == SCTP_ADDR_IS_CONFIRMED)
3870                         /* SCTP_ADDR_IS_CONFIRMED is passed by connect_x */
3871                         net->dest_state = SCTP_ADDR_REACHABLE;
3872                 else
3873                         net->dest_state = SCTP_ADDR_REACHABLE |
3874                             SCTP_ADDR_UNCONFIRMED;
3875         }
3876         /*
3877          * We set this to 0, the timer code knows that this means its an
3878          * initial value
3879          */
3880         net->rto_needed = 1;
3881         net->RTO = 0;
3882         net->RTO_measured = 0;
3883         stcb->asoc.numnets++;
3884         net->ref_count = 1;
3885         net->cwr_window_tsn = net->last_cwr_tsn = stcb->asoc.sending_seq - 1;
3886         net->port = port;
3887         net->dscp = stcb->asoc.default_dscp;
3888 #ifdef INET6
3889         net->flowlabel = stcb->asoc.default_flowlabel;
3890 #endif
3891         if (sctp_stcb_is_feature_on(stcb->sctp_ep, stcb, SCTP_PCB_FLAGS_DONOT_HEARTBEAT)) {
3892                 net->dest_state |= SCTP_ADDR_NOHB;
3893         } else {
3894                 net->dest_state &= ~SCTP_ADDR_NOHB;
3895         }
3896         if (sctp_stcb_is_feature_on(stcb->sctp_ep, stcb, SCTP_PCB_FLAGS_DO_NOT_PMTUD)) {
3897                 net->dest_state |= SCTP_ADDR_NO_PMTUD;
3898         } else {
3899                 net->dest_state &= ~SCTP_ADDR_NO_PMTUD;
3900         }
3901         net->heart_beat_delay = stcb->asoc.heart_beat_delay;
3902         /* Init the timer structure */
3903         SCTP_OS_TIMER_INIT(&net->rxt_timer.timer);
3904         SCTP_OS_TIMER_INIT(&net->pmtu_timer.timer);
3905         SCTP_OS_TIMER_INIT(&net->hb_timer.timer);
3906
3907         /* Now generate a route for this guy */
3908 #ifdef INET6
3909         /* KAME hack: embed scopeid */
3910         if (newaddr->sa_family == AF_INET6) {
3911                 struct sockaddr_in6 *sin6;
3912
3913                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
3914                 (void)sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
3915                 sin6->sin6_scope_id = 0;
3916         }
3917 #endif
3918         SCTP_RTALLOC((sctp_route_t *)&net->ro,
3919             stcb->asoc.vrf_id,
3920             stcb->sctp_ep->fibnum);
3921
3922         net->src_addr_selected = 0;
3923         if (SCTP_ROUTE_HAS_VALID_IFN(&net->ro)) {
3924                 /* Get source address */
3925                 net->ro._s_addr = sctp_source_address_selection(stcb->sctp_ep,
3926                     stcb,
3927                     (sctp_route_t *)&net->ro,
3928                     net,
3929                     0,
3930                     stcb->asoc.vrf_id);
3931                 if (stcb->asoc.default_mtu > 0) {
3932                         net->mtu = stcb->asoc.default_mtu;
3933                         switch (net->ro._l_addr.sa.sa_family) {
3934 #ifdef INET
3935                         case AF_INET:
3936                                 net->mtu += SCTP_MIN_V4_OVERHEAD;
3937                                 break;
3938 #endif
3939 #ifdef INET6
3940                         case AF_INET6:
3941                                 net->mtu += SCTP_MIN_OVERHEAD;
3942                                 break;
3943 #endif
3944                         default:
3945                                 break;
3946                         }
3947 #if defined(INET) || defined(INET6)
3948                         if (net->port) {
3949                                 net->mtu += (uint32_t)sizeof(struct udphdr);
3950                         }
3951 #endif
3952                 } else if (net->ro._s_addr != NULL) {
3953                         uint32_t imtu, rmtu, hcmtu;
3954
3955                         net->src_addr_selected = 1;
3956                         /* Now get the interface MTU */
3957                         if (net->ro._s_addr->ifn_p != NULL) {
3958                                 imtu = SCTP_GATHER_MTU_FROM_INTFC(net->ro._s_addr->ifn_p);
3959                         } else {
3960                                 imtu = 0;
3961                         }
3962                         rmtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, net->ro.ro_nh);
3963                         hcmtu = sctp_hc_get_mtu(&net->ro._l_addr, stcb->sctp_ep->fibnum);
3964                         net->mtu = sctp_min_mtu(hcmtu, rmtu, imtu);
3965                 }
3966         }
3967         if (net->mtu == 0) {
3968                 if (stcb->asoc.default_mtu > 0) {
3969                         net->mtu = stcb->asoc.default_mtu;
3970                         switch (net->ro._l_addr.sa.sa_family) {
3971 #ifdef INET
3972                         case AF_INET:
3973                                 net->mtu += SCTP_MIN_V4_OVERHEAD;
3974                                 break;
3975 #endif
3976 #ifdef INET6
3977                         case AF_INET6:
3978                                 net->mtu += SCTP_MIN_OVERHEAD;
3979                                 break;
3980 #endif
3981                         default:
3982                                 break;
3983                         }
3984 #if defined(INET) || defined(INET6)
3985                         if (net->port) {
3986                                 net->mtu += (uint32_t)sizeof(struct udphdr);
3987                         }
3988 #endif
3989                 } else {
3990                         switch (newaddr->sa_family) {
3991 #ifdef INET
3992                         case AF_INET:
3993                                 net->mtu = SCTP_DEFAULT_MTU;
3994                                 break;
3995 #endif
3996 #ifdef INET6
3997                         case AF_INET6:
3998                                 net->mtu = 1280;
3999                                 break;
4000 #endif
4001                         default:
4002                                 break;
4003                         }
4004                 }
4005         }
4006 #if defined(INET) || defined(INET6)
4007         if (net->port) {
4008                 net->mtu -= (uint32_t)sizeof(struct udphdr);
4009         }
4010 #endif
4011         if (from == SCTP_ALLOC_ASOC) {
4012                 stcb->asoc.smallest_mtu = net->mtu;
4013         }
4014         if (stcb->asoc.smallest_mtu > net->mtu) {
4015                 sctp_pathmtu_adjustment(stcb, net->mtu);
4016         }
4017 #ifdef INET6
4018         if (newaddr->sa_family == AF_INET6) {
4019                 struct sockaddr_in6 *sin6;
4020
4021                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4022                 (void)sa6_recoverscope(sin6);
4023         }
4024 #endif
4025
4026         /* JRS - Use the congestion control given in the CC module */
4027         if (stcb->asoc.cc_functions.sctp_set_initial_cc_param != NULL)
4028                 (*stcb->asoc.cc_functions.sctp_set_initial_cc_param) (stcb, net);
4029
4030         /*
4031          * CMT: CUC algo - set find_pseudo_cumack to TRUE (1) at beginning
4032          * of assoc (2005/06/27, iyengar@cis.udel.edu)
4033          */
4034         net->find_pseudo_cumack = 1;
4035         net->find_rtx_pseudo_cumack = 1;
4036         /* Choose an initial flowid. */
4037         net->flowid = stcb->asoc.my_vtag ^
4038             ntohs(stcb->rport) ^
4039             ntohs(stcb->sctp_ep->sctp_lport);
4040         net->flowtype = M_HASHTYPE_OPAQUE_HASH;
4041         if (netp) {
4042                 *netp = net;
4043         }
4044         netfirst = TAILQ_FIRST(&stcb->asoc.nets);
4045         if (net->ro.ro_nh == NULL) {
4046                 /* Since we have no route put it at the back */
4047                 TAILQ_INSERT_TAIL(&stcb->asoc.nets, net, sctp_next);
4048         } else if (netfirst == NULL) {
4049                 /* We are the first one in the pool. */
4050                 TAILQ_INSERT_HEAD(&stcb->asoc.nets, net, sctp_next);
4051         } else if (netfirst->ro.ro_nh == NULL) {
4052                 /*
4053                  * First one has NO route. Place this one ahead of the first
4054                  * one.
4055                  */
4056                 TAILQ_INSERT_HEAD(&stcb->asoc.nets, net, sctp_next);
4057         } else if (net->ro.ro_nh->nh_ifp != netfirst->ro.ro_nh->nh_ifp) {
4058                 /*
4059                  * This one has a different interface than the one at the
4060                  * top of the list. Place it ahead.
4061                  */
4062                 TAILQ_INSERT_HEAD(&stcb->asoc.nets, net, sctp_next);
4063         } else {
4064                 /*
4065                  * Ok we have the same interface as the first one. Move
4066                  * forward until we find either a) one with a NULL route...
4067                  * insert ahead of that b) one with a different ifp.. insert
4068                  * after that. c) end of the list.. insert at the tail.
4069                  */
4070                 struct sctp_nets *netlook;
4071
4072                 do {
4073                         netlook = TAILQ_NEXT(netfirst, sctp_next);
4074                         if (netlook == NULL) {
4075                                 /* End of the list */
4076                                 TAILQ_INSERT_TAIL(&stcb->asoc.nets, net, sctp_next);
4077                                 break;
4078                         } else if (netlook->ro.ro_nh == NULL) {
4079                                 /* next one has NO route */
4080                                 TAILQ_INSERT_BEFORE(netfirst, net, sctp_next);
4081                                 break;
4082                         } else if (netlook->ro.ro_nh->nh_ifp != net->ro.ro_nh->nh_ifp) {
4083                                 TAILQ_INSERT_AFTER(&stcb->asoc.nets, netlook,
4084                                     net, sctp_next);
4085                                 break;
4086                         }
4087                         /* Shift forward */
4088                         netfirst = netlook;
4089                 } while (netlook != NULL);
4090         }
4091
4092         /* got to have a primary set */
4093         if (stcb->asoc.primary_destination == 0) {
4094                 stcb->asoc.primary_destination = net;
4095         } else if ((stcb->asoc.primary_destination->ro.ro_nh == NULL) &&
4096                     (net->ro.ro_nh) &&
4097             ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0)) {
4098                 /* No route to current primary adopt new primary */
4099                 stcb->asoc.primary_destination = net;
4100         }
4101         /* Validate primary is first */
4102         net = TAILQ_FIRST(&stcb->asoc.nets);
4103         if ((net != stcb->asoc.primary_destination) &&
4104             (stcb->asoc.primary_destination)) {
4105                 /*
4106                  * first one on the list is NOT the primary sctp_cmpaddr()
4107                  * is much more efficient if the primary is the first on the
4108                  * list, make it so.
4109                  */
4110                 TAILQ_REMOVE(&stcb->asoc.nets,
4111                     stcb->asoc.primary_destination, sctp_next);
4112                 TAILQ_INSERT_HEAD(&stcb->asoc.nets,
4113                     stcb->asoc.primary_destination, sctp_next);
4114         }
4115         return (0);
4116 }
4117
4118 static uint32_t
4119 sctp_aloc_a_assoc_id(struct sctp_inpcb *inp, struct sctp_tcb *stcb)
4120 {
4121         uint32_t id;
4122         struct sctpasochead *head;
4123         struct sctp_tcb *lstcb;
4124
4125 try_again:
4126         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) {
4127                 /* TSNH */
4128                 return (0);
4129         }
4130         /*
4131          * We don't allow assoc id to be one of SCTP_FUTURE_ASSOC,
4132          * SCTP_CURRENT_ASSOC and SCTP_ALL_ASSOC.
4133          */
4134         if (inp->sctp_associd_counter <= SCTP_ALL_ASSOC) {
4135                 inp->sctp_associd_counter = SCTP_ALL_ASSOC + 1;
4136         }
4137         id = inp->sctp_associd_counter;
4138         inp->sctp_associd_counter++;
4139         lstcb = sctp_findasoc_ep_asocid_locked(inp, (sctp_assoc_t)id, 0);
4140         if (lstcb) {
4141                 goto try_again;
4142         }
4143         head = &inp->sctp_asocidhash[SCTP_PCBHASH_ASOC(id, inp->hashasocidmark)];
4144         LIST_INSERT_HEAD(head, stcb, sctp_tcbasocidhash);
4145         stcb->asoc.in_asocid_hash = 1;
4146         return (id);
4147 }
4148
4149 /*
4150  * allocate an association and add it to the endpoint. The caller must be
4151  * careful to add all additional addresses once they are know right away or
4152  * else the assoc will be may experience a blackout scenario.
4153  */
4154 struct sctp_tcb *
4155 sctp_aloc_assoc(struct sctp_inpcb *inp, struct sockaddr *firstaddr,
4156     int *error, uint32_t override_tag, uint32_t initial_tsn,
4157     uint32_t vrf_id, uint16_t o_streams, uint16_t port,
4158     struct thread *p,
4159     int initialize_auth_params)
4160 {
4161         /* note the p argument is only valid in unbound sockets */
4162
4163         struct sctp_tcb *stcb;
4164         struct sctp_association *asoc;
4165         struct sctpasochead *head;
4166         uint16_t rport;
4167         int err;
4168
4169         /*
4170          * Assumption made here: Caller has done a
4171          * sctp_findassociation_ep_addr(ep, addr's); to make sure the
4172          * address does not exist already.
4173          */
4174         if (SCTP_BASE_INFO(ipi_count_asoc) >= SCTP_MAX_NUM_OF_ASOC) {
4175                 /* Hit max assoc, sorry no more */
4176                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, ENOBUFS);
4177                 *error = ENOBUFS;
4178                 return (NULL);
4179         }
4180         if (firstaddr == NULL) {
4181                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, EINVAL);
4182                 *error = EINVAL;
4183                 return (NULL);
4184         }
4185         SCTP_INP_RLOCK(inp);
4186         if ((inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL) &&
4187             ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_PORTREUSE)) ||
4188             (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED))) {
4189                 /*
4190                  * If its in the TCP pool, its NOT allowed to create an
4191                  * association. The parent listener needs to call
4192                  * sctp_aloc_assoc.. or the one-2-many socket. If a peeled
4193                  * off, or connected one does this.. its an error.
4194                  */
4195                 SCTP_INP_RUNLOCK(inp);
4196                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, EINVAL);
4197                 *error = EINVAL;
4198                 return (NULL);
4199         }
4200         if ((inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL) ||
4201             (inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE)) {
4202                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_WAS_CONNECTED) ||
4203                     (inp->sctp_flags & SCTP_PCB_FLAGS_WAS_ABORTED)) {
4204                         SCTP_INP_RUNLOCK(inp);
4205                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, EINVAL);
4206                         *error = EINVAL;
4207                         return (NULL);
4208                 }
4209         }
4210         SCTPDBG(SCTP_DEBUG_PCB3, "Allocate an association for peer:");
4211 #ifdef SCTP_DEBUG
4212         if (firstaddr) {
4213                 SCTPDBG_ADDR(SCTP_DEBUG_PCB3, firstaddr);
4214                 switch (firstaddr->sa_family) {
4215 #ifdef INET
4216                 case AF_INET:
4217                         SCTPDBG(SCTP_DEBUG_PCB3, "Port:%d\n",
4218                             ntohs(((struct sockaddr_in *)firstaddr)->sin_port));
4219                         break;
4220 #endif
4221 #ifdef INET6
4222                 case AF_INET6:
4223                         SCTPDBG(SCTP_DEBUG_PCB3, "Port:%d\n",
4224                             ntohs(((struct sockaddr_in6 *)firstaddr)->sin6_port));
4225                         break;
4226 #endif
4227                 default:
4228                         break;
4229                 }
4230         } else {
4231                 SCTPDBG(SCTP_DEBUG_PCB3, "None\n");
4232         }
4233 #endif                          /* SCTP_DEBUG */
4234         switch (firstaddr->sa_family) {
4235 #ifdef INET
4236         case AF_INET:
4237                 {
4238                         struct sockaddr_in *sin;
4239
4240                         sin = (struct sockaddr_in *)firstaddr;
4241                         if ((ntohs(sin->sin_port) == 0) ||
4242                             (sin->sin_addr.s_addr == INADDR_ANY) ||
4243                             (sin->sin_addr.s_addr == INADDR_BROADCAST) ||
4244                             IN_MULTICAST(ntohl(sin->sin_addr.s_addr)) ||
4245                             (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) != 0) &&
4246                             (SCTP_IPV6_V6ONLY(inp) != 0))) {
4247                                 /* Invalid address */
4248                                 SCTP_INP_RUNLOCK(inp);
4249                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, EINVAL);
4250                                 *error = EINVAL;
4251                                 return (NULL);
4252                         }
4253                         rport = sin->sin_port;
4254                         break;
4255                 }
4256 #endif
4257 #ifdef INET6
4258         case AF_INET6:
4259                 {
4260                         struct sockaddr_in6 *sin6;
4261
4262                         sin6 = (struct sockaddr_in6 *)firstaddr;
4263                         if ((ntohs(sin6->sin6_port) == 0) ||
4264                             IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) ||
4265                             IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr) ||
4266                             ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0)) {
4267                                 /* Invalid address */
4268                                 SCTP_INP_RUNLOCK(inp);
4269                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, EINVAL);
4270                                 *error = EINVAL;
4271                                 return (NULL);
4272                         }
4273                         rport = sin6->sin6_port;
4274                         break;
4275                 }
4276 #endif
4277         default:
4278                 /* not supported family type */
4279                 SCTP_INP_RUNLOCK(inp);
4280                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, EINVAL);
4281                 *error = EINVAL;
4282                 return (NULL);
4283         }
4284         SCTP_INP_RUNLOCK(inp);
4285         if (inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) {
4286                 /*
4287                  * If you have not performed a bind, then we need to do the
4288                  * ephemeral bind for you.
4289                  */
4290                 if ((err = sctp_inpcb_bind(inp->sctp_socket, NULL, NULL, p))) {
4291                         /* bind error, probably perm */
4292                         *error = err;
4293                         return (NULL);
4294                 }
4295         }
4296         stcb = SCTP_ZONE_GET(SCTP_BASE_INFO(ipi_zone_asoc), struct sctp_tcb);
4297         if (stcb == NULL) {
4298                 /* out of memory? */
4299                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, ENOMEM);
4300                 *error = ENOMEM;
4301                 return (NULL);
4302         }
4303         SCTP_INCR_ASOC_COUNT();
4304
4305         memset(stcb, 0, sizeof(*stcb));
4306         asoc = &stcb->asoc;
4307
4308         SCTP_TCB_LOCK_INIT(stcb);
4309         SCTP_TCB_SEND_LOCK_INIT(stcb);
4310         stcb->rport = rport;
4311         /* setup back pointer's */
4312         stcb->sctp_ep = inp;
4313         stcb->sctp_socket = inp->sctp_socket;
4314         if ((err = sctp_init_asoc(inp, stcb, override_tag, initial_tsn, vrf_id, o_streams))) {
4315                 /* failed */
4316                 SCTP_TCB_LOCK_DESTROY(stcb);
4317                 SCTP_TCB_SEND_LOCK_DESTROY(stcb);
4318                 SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_asoc), stcb);
4319                 SCTP_DECR_ASOC_COUNT();
4320                 *error = err;
4321                 return (NULL);
4322         }
4323         /* and the port */
4324         SCTP_INP_INFO_WLOCK();
4325         SCTP_INP_WLOCK(inp);
4326         if (inp->sctp_flags & (SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
4327                 /* inpcb freed while alloc going on */
4328                 SCTP_TCB_LOCK_DESTROY(stcb);
4329                 SCTP_TCB_SEND_LOCK_DESTROY(stcb);
4330                 SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_asoc), stcb);
4331                 SCTP_INP_WUNLOCK(inp);
4332                 SCTP_INP_INFO_WUNLOCK();
4333                 SCTP_DECR_ASOC_COUNT();
4334                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, EINVAL);
4335                 *error = EINVAL;
4336                 return (NULL);
4337         }
4338         SCTP_TCB_LOCK(stcb);
4339
4340         asoc->assoc_id = sctp_aloc_a_assoc_id(inp, stcb);
4341         /* now that my_vtag is set, add it to the hash */
4342         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
4343         /* put it in the bucket in the vtag hash of assoc's for the system */
4344         LIST_INSERT_HEAD(head, stcb, sctp_asocs);
4345         SCTP_INP_INFO_WUNLOCK();
4346
4347         if (sctp_add_remote_addr(stcb, firstaddr, NULL, port, SCTP_DO_SETSCOPE, SCTP_ALLOC_ASOC)) {
4348                 /* failure.. memory error? */
4349                 if (asoc->strmout) {
4350                         SCTP_FREE(asoc->strmout, SCTP_M_STRMO);
4351                         asoc->strmout = NULL;
4352                 }
4353                 if (asoc->mapping_array) {
4354                         SCTP_FREE(asoc->mapping_array, SCTP_M_MAP);
4355                         asoc->mapping_array = NULL;
4356                 }
4357                 if (asoc->nr_mapping_array) {
4358                         SCTP_FREE(asoc->nr_mapping_array, SCTP_M_MAP);
4359                         asoc->nr_mapping_array = NULL;
4360                 }
4361                 SCTP_DECR_ASOC_COUNT();
4362                 SCTP_TCB_UNLOCK(stcb);
4363                 SCTP_TCB_LOCK_DESTROY(stcb);
4364                 SCTP_TCB_SEND_LOCK_DESTROY(stcb);
4365                 LIST_REMOVE(stcb, sctp_tcbasocidhash);
4366                 SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_asoc), stcb);
4367                 SCTP_INP_WUNLOCK(inp);
4368                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, ENOBUFS);
4369                 *error = ENOBUFS;
4370                 return (NULL);
4371         }
4372         /* Init all the timers */
4373         SCTP_OS_TIMER_INIT(&asoc->dack_timer.timer);
4374         SCTP_OS_TIMER_INIT(&asoc->strreset_timer.timer);
4375         SCTP_OS_TIMER_INIT(&asoc->asconf_timer.timer);
4376         SCTP_OS_TIMER_INIT(&asoc->shut_guard_timer.timer);
4377         SCTP_OS_TIMER_INIT(&asoc->autoclose_timer.timer);
4378         SCTP_OS_TIMER_INIT(&asoc->delete_prim_timer.timer);
4379
4380         LIST_INSERT_HEAD(&inp->sctp_asoc_list, stcb, sctp_tcblist);
4381         /* now file the port under the hash as well */
4382         if (inp->sctp_tcbhash != NULL) {
4383                 head = &inp->sctp_tcbhash[SCTP_PCBHASH_ALLADDR(stcb->rport,
4384                     inp->sctp_hashmark)];
4385                 LIST_INSERT_HEAD(head, stcb, sctp_tcbhash);
4386         }
4387         if (initialize_auth_params == SCTP_INITIALIZE_AUTH_PARAMS) {
4388                 sctp_initialize_auth_params(inp, stcb);
4389         }
4390         SCTP_INP_WUNLOCK(inp);
4391         SCTPDBG(SCTP_DEBUG_PCB1, "Association %p now allocated\n", (void *)stcb);
4392         return (stcb);
4393 }
4394
4395 void
4396 sctp_remove_net(struct sctp_tcb *stcb, struct sctp_nets *net)
4397 {
4398         struct sctp_inpcb *inp;
4399         struct sctp_association *asoc;
4400
4401         inp = stcb->sctp_ep;
4402         asoc = &stcb->asoc;
4403         asoc->numnets--;
4404         TAILQ_REMOVE(&asoc->nets, net, sctp_next);
4405         if (net == asoc->primary_destination) {
4406                 /* Reset primary */
4407                 struct sctp_nets *lnet;
4408
4409                 lnet = TAILQ_FIRST(&asoc->nets);
4410                 /*
4411                  * Mobility adaptation Ideally, if deleted destination is
4412                  * the primary, it becomes a fast retransmission trigger by
4413                  * the subsequent SET PRIMARY. (by micchie)
4414                  */
4415                 if (sctp_is_mobility_feature_on(stcb->sctp_ep,
4416                     SCTP_MOBILITY_BASE) ||
4417                     sctp_is_mobility_feature_on(stcb->sctp_ep,
4418                     SCTP_MOBILITY_FASTHANDOFF)) {
4419                         SCTPDBG(SCTP_DEBUG_ASCONF1, "remove_net: primary dst is deleting\n");
4420                         if (asoc->deleted_primary != NULL) {
4421                                 SCTPDBG(SCTP_DEBUG_ASCONF1, "remove_net: deleted primary may be already stored\n");
4422                                 goto out;
4423                         }
4424                         asoc->deleted_primary = net;
4425                         atomic_add_int(&net->ref_count, 1);
4426                         memset(&net->lastsa, 0, sizeof(net->lastsa));
4427                         memset(&net->lastsv, 0, sizeof(net->lastsv));
4428                         sctp_mobility_feature_on(stcb->sctp_ep,
4429                             SCTP_MOBILITY_PRIM_DELETED);
4430                         sctp_timer_start(SCTP_TIMER_TYPE_PRIM_DELETED,
4431                             stcb->sctp_ep, stcb, NULL);
4432                 }
4433 out:
4434                 /* Try to find a confirmed primary */
4435                 asoc->primary_destination = sctp_find_alternate_net(stcb, lnet, 0);
4436         }
4437         if (net == asoc->last_data_chunk_from) {
4438                 /* Reset primary */
4439                 asoc->last_data_chunk_from = TAILQ_FIRST(&asoc->nets);
4440         }
4441         if (net == asoc->last_control_chunk_from) {
4442                 /* Clear net */
4443                 asoc->last_control_chunk_from = NULL;
4444         }
4445         if (net == asoc->last_net_cmt_send_started) {
4446                 /* Clear net */
4447                 asoc->last_net_cmt_send_started = NULL;
4448         }
4449         if (net == stcb->asoc.alternate) {
4450                 sctp_free_remote_addr(stcb->asoc.alternate);
4451                 stcb->asoc.alternate = NULL;
4452         }
4453         sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net,
4454             SCTP_FROM_SCTP_PCB + SCTP_LOC_9);
4455         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
4456             SCTP_FROM_SCTP_PCB + SCTP_LOC_10);
4457         net->dest_state |= SCTP_ADDR_BEING_DELETED;
4458         sctp_free_remote_addr(net);
4459 }
4460
4461 /*
4462  * remove a remote endpoint address from an association, it will fail if the
4463  * address does not exist.
4464  */
4465 int
4466 sctp_del_remote_addr(struct sctp_tcb *stcb, struct sockaddr *remaddr)
4467 {
4468         /*
4469          * Here we need to remove a remote address. This is quite simple, we
4470          * first find it in the list of address for the association
4471          * (tasoc->asoc.nets) and then if it is there, we do a LIST_REMOVE
4472          * on that item. Note we do not allow it to be removed if there are
4473          * no other addresses.
4474          */
4475         struct sctp_association *asoc;
4476         struct sctp_nets *net, *nnet;
4477
4478         asoc = &stcb->asoc;
4479
4480         /* locate the address */
4481         TAILQ_FOREACH_SAFE(net, &asoc->nets, sctp_next, nnet) {
4482                 if (net->ro._l_addr.sa.sa_family != remaddr->sa_family) {
4483                         continue;
4484                 }
4485                 if (sctp_cmpaddr((struct sockaddr *)&net->ro._l_addr,
4486                     remaddr)) {
4487                         /* we found the guy */
4488                         if (asoc->numnets < 2) {
4489                                 /* Must have at LEAST two remote addresses */
4490                                 return (-1);
4491                         } else {
4492                                 sctp_remove_net(stcb, net);
4493                                 return (0);
4494                         }
4495                 }
4496         }
4497         /* not found. */
4498         return (-2);
4499 }
4500
4501 void
4502 sctp_delete_from_timewait(uint32_t tag, uint16_t lport, uint16_t rport)
4503 {
4504         struct sctpvtaghead *chain;
4505         struct sctp_tagblock *twait_block;
4506         int found = 0;
4507         int i;
4508
4509         chain = &SCTP_BASE_INFO(vtag_timewait)[(tag % SCTP_STACK_VTAG_HASH_SIZE)];
4510         LIST_FOREACH(twait_block, chain, sctp_nxt_tagblock) {
4511                 for (i = 0; i < SCTP_NUMBER_IN_VTAG_BLOCK; i++) {
4512                         if ((twait_block->vtag_block[i].v_tag == tag) &&
4513                             (twait_block->vtag_block[i].lport == lport) &&
4514                             (twait_block->vtag_block[i].rport == rport)) {
4515                                 twait_block->vtag_block[i].tv_sec_at_expire = 0;
4516                                 twait_block->vtag_block[i].v_tag = 0;
4517                                 twait_block->vtag_block[i].lport = 0;
4518                                 twait_block->vtag_block[i].rport = 0;
4519                                 found = 1;
4520                                 break;
4521                         }
4522                 }
4523                 if (found)
4524                         break;
4525         }
4526 }
4527
4528 int
4529 sctp_is_in_timewait(uint32_t tag, uint16_t lport, uint16_t rport)
4530 {
4531         struct sctpvtaghead *chain;
4532         struct sctp_tagblock *twait_block;
4533         int found = 0;
4534         int i;
4535
4536         SCTP_INP_INFO_WLOCK();
4537         chain = &SCTP_BASE_INFO(vtag_timewait)[(tag % SCTP_STACK_VTAG_HASH_SIZE)];
4538         LIST_FOREACH(twait_block, chain, sctp_nxt_tagblock) {
4539                 for (i = 0; i < SCTP_NUMBER_IN_VTAG_BLOCK; i++) {
4540                         if ((twait_block->vtag_block[i].v_tag == tag) &&
4541                             (twait_block->vtag_block[i].lport == lport) &&
4542                             (twait_block->vtag_block[i].rport == rport)) {
4543                                 found = 1;
4544                                 break;
4545                         }
4546                 }
4547                 if (found)
4548                         break;
4549         }
4550         SCTP_INP_INFO_WUNLOCK();
4551         return (found);
4552 }
4553
4554 void
4555 sctp_add_vtag_to_timewait(uint32_t tag, uint32_t time, uint16_t lport, uint16_t rport)
4556 {
4557         struct sctpvtaghead *chain;
4558         struct sctp_tagblock *twait_block;
4559         struct timeval now;
4560         int set, i;
4561
4562         if (time == 0) {
4563                 /* Its disabled */
4564                 return;
4565         }
4566         (void)SCTP_GETTIME_TIMEVAL(&now);
4567         chain = &SCTP_BASE_INFO(vtag_timewait)[(tag % SCTP_STACK_VTAG_HASH_SIZE)];
4568         set = 0;
4569         LIST_FOREACH(twait_block, chain, sctp_nxt_tagblock) {
4570                 /* Block(s) present, lets find space, and expire on the fly */
4571                 for (i = 0; i < SCTP_NUMBER_IN_VTAG_BLOCK; i++) {
4572                         if ((twait_block->vtag_block[i].v_tag == 0) &&
4573                             !set) {
4574                                 twait_block->vtag_block[i].tv_sec_at_expire =
4575                                     now.tv_sec + time;
4576                                 twait_block->vtag_block[i].v_tag = tag;
4577                                 twait_block->vtag_block[i].lport = lport;
4578                                 twait_block->vtag_block[i].rport = rport;
4579                                 set = 1;
4580                         } else if ((twait_block->vtag_block[i].v_tag) &&
4581                             ((long)twait_block->vtag_block[i].tv_sec_at_expire < now.tv_sec)) {
4582                                 /* Audit expires this guy */
4583                                 twait_block->vtag_block[i].tv_sec_at_expire = 0;
4584                                 twait_block->vtag_block[i].v_tag = 0;
4585                                 twait_block->vtag_block[i].lport = 0;
4586                                 twait_block->vtag_block[i].rport = 0;
4587                                 if (set == 0) {
4588                                         /* Reuse it for my new tag */
4589                                         twait_block->vtag_block[i].tv_sec_at_expire = now.tv_sec + time;
4590                                         twait_block->vtag_block[i].v_tag = tag;
4591                                         twait_block->vtag_block[i].lport = lport;
4592                                         twait_block->vtag_block[i].rport = rport;
4593                                         set = 1;
4594                                 }
4595                         }
4596                 }
4597                 if (set) {
4598                         /*
4599                          * We only do up to the block where we can place our
4600                          * tag for audits
4601                          */
4602                         break;
4603                 }
4604         }
4605         /* Need to add a new block to chain */
4606         if (!set) {
4607                 SCTP_MALLOC(twait_block, struct sctp_tagblock *,
4608                     sizeof(struct sctp_tagblock), SCTP_M_TIMW);
4609                 if (twait_block == NULL) {
4610                         return;
4611                 }
4612                 memset(twait_block, 0, sizeof(struct sctp_tagblock));
4613                 LIST_INSERT_HEAD(chain, twait_block, sctp_nxt_tagblock);
4614                 twait_block->vtag_block[0].tv_sec_at_expire = now.tv_sec + time;
4615                 twait_block->vtag_block[0].v_tag = tag;
4616                 twait_block->vtag_block[0].lport = lport;
4617                 twait_block->vtag_block[0].rport = rport;
4618         }
4619 }
4620
4621 void
4622 sctp_clean_up_stream(struct sctp_tcb *stcb, struct sctp_readhead *rh)
4623 {
4624         struct sctp_tmit_chunk *chk, *nchk;
4625         struct sctp_queued_to_read *control, *ncontrol;
4626
4627         TAILQ_FOREACH_SAFE(control, rh, next_instrm, ncontrol) {
4628                 TAILQ_REMOVE(rh, control, next_instrm);
4629                 control->on_strm_q = 0;
4630                 if (control->on_read_q == 0) {
4631                         sctp_free_remote_addr(control->whoFrom);
4632                         if (control->data) {
4633                                 sctp_m_freem(control->data);
4634                                 control->data = NULL;
4635                         }
4636                 }
4637                 /* Reassembly free? */
4638                 TAILQ_FOREACH_SAFE(chk, &control->reasm, sctp_next, nchk) {
4639                         TAILQ_REMOVE(&control->reasm, chk, sctp_next);
4640                         if (chk->data) {
4641                                 sctp_m_freem(chk->data);
4642                                 chk->data = NULL;
4643                         }
4644                         if (chk->holds_key_ref)
4645                                 sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED);
4646                         sctp_free_remote_addr(chk->whoTo);
4647                         SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk);
4648                         SCTP_DECR_CHK_COUNT();
4649                         /* sa_ignore FREED_MEMORY */
4650                 }
4651                 /*
4652                  * We don't free the address here since all the net's were
4653                  * freed above.
4654                  */
4655                 if (control->on_read_q == 0) {
4656                         sctp_free_a_readq(stcb, control);
4657                 }
4658         }
4659 }
4660
4661 /*-
4662  * Free the association after un-hashing the remote port. This
4663  * function ALWAYS returns holding NO LOCK on the stcb. It DOES
4664  * expect that the input to this function IS a locked TCB.
4665  * It will return 0, if it did NOT destroy the association (instead
4666  * it unlocks it. It will return NON-zero if it either destroyed the
4667  * association OR the association is already destroyed.
4668  */
4669 int
4670 sctp_free_assoc(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int from_inpcbfree, int from_location)
4671 {
4672         int i;
4673         struct sctp_association *asoc;
4674         struct sctp_nets *net, *nnet;
4675         struct sctp_laddr *laddr, *naddr;
4676         struct sctp_tmit_chunk *chk, *nchk;
4677         struct sctp_asconf_addr *aparam, *naparam;
4678         struct sctp_asconf_ack *aack, *naack;
4679         struct sctp_stream_reset_list *strrst, *nstrrst;
4680         struct sctp_queued_to_read *sq, *nsq;
4681         struct sctp_stream_queue_pending *sp, *nsp;
4682         sctp_sharedkey_t *shared_key, *nshared_key;
4683         struct socket *so;
4684
4685         /* first, lets purge the entry from the hash table. */
4686
4687 #ifdef SCTP_LOG_CLOSING
4688         sctp_log_closing(inp, stcb, 6);
4689 #endif
4690         if (stcb->asoc.state == 0) {
4691 #ifdef SCTP_LOG_CLOSING
4692                 sctp_log_closing(inp, NULL, 7);
4693 #endif
4694                 /* there is no asoc, really TSNH :-0 */
4695                 return (1);
4696         }
4697         SCTP_TCB_SEND_LOCK(stcb);
4698         if (stcb->asoc.alternate) {
4699                 sctp_free_remote_addr(stcb->asoc.alternate);
4700                 stcb->asoc.alternate = NULL;
4701         }
4702         /* TEMP CODE */
4703         if (stcb->freed_from_where == 0) {
4704                 /* Only record the first place free happened from */
4705                 stcb->freed_from_where = from_location;
4706         }
4707         /* TEMP CODE */
4708
4709         asoc = &stcb->asoc;
4710         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
4711             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE))
4712                 /* nothing around */
4713                 so = NULL;
4714         else
4715                 so = inp->sctp_socket;
4716
4717         /*
4718          * We used timer based freeing if a reader or writer is in the way.
4719          * So we first check if we are actually being called from a timer,
4720          * if so we abort early if a reader or writer is still in the way.
4721          */
4722         if ((stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) &&
4723             (from_inpcbfree == SCTP_NORMAL_PROC)) {
4724                 /*
4725                  * is it the timer driving us? if so are the reader/writers
4726                  * gone?
4727                  */
4728                 if (stcb->asoc.refcnt) {
4729                         /* nope, reader or writer in the way */
4730                         sctp_timer_start(SCTP_TIMER_TYPE_ASOCKILL, inp, stcb, NULL);
4731                         /* no asoc destroyed */
4732                         SCTP_TCB_SEND_UNLOCK(stcb);
4733                         SCTP_TCB_UNLOCK(stcb);
4734 #ifdef SCTP_LOG_CLOSING
4735                         sctp_log_closing(inp, stcb, 8);
4736 #endif
4737                         return (0);
4738                 }
4739         }
4740         /* Now clean up any other timers */
4741         sctp_stop_association_timers(stcb, false);
4742         /* Now the read queue needs to be cleaned up (only once) */
4743         if ((stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0) {
4744                 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_ABOUT_TO_BE_FREED);
4745                 SCTP_INP_READ_LOCK(inp);
4746                 TAILQ_FOREACH(sq, &inp->read_queue, next) {
4747                         if (sq->stcb == stcb) {
4748                                 sq->do_not_ref_stcb = 1;
4749                                 sq->sinfo_cumtsn = stcb->asoc.cumulative_tsn;
4750                                 /*
4751                                  * If there is no end, there never will be
4752                                  * now.
4753                                  */
4754                                 if (sq->end_added == 0) {
4755                                         /* Held for PD-API clear that. */
4756                                         sq->pdapi_aborted = 1;
4757                                         sq->held_length = 0;
4758                                         if (sctp_stcb_is_feature_on(inp, stcb, SCTP_PCB_FLAGS_PDAPIEVNT) && (so != NULL)) {
4759                                                 /*
4760                                                  * Need to add a PD-API
4761                                                  * aborted indication.
4762                                                  * Setting the control_pdapi
4763                                                  * assures that it will be
4764                                                  * added right after this
4765                                                  * msg.
4766                                                  */
4767                                                 uint32_t strseq;
4768
4769                                                 stcb->asoc.control_pdapi = sq;
4770                                                 strseq = (sq->sinfo_stream << 16) | (sq->mid & 0x0000ffff);
4771                                                 sctp_ulp_notify(SCTP_NOTIFY_PARTIAL_DELVIERY_INDICATION,
4772                                                     stcb,
4773                                                     SCTP_PARTIAL_DELIVERY_ABORTED,
4774                                                     (void *)&strseq,
4775                                                     SCTP_SO_LOCKED);
4776                                                 stcb->asoc.control_pdapi = NULL;
4777                                         }
4778                                 }
4779                                 /* Add an end to wake them */
4780                                 sq->end_added = 1;
4781                         }
4782                 }
4783                 SCTP_INP_READ_UNLOCK(inp);
4784                 if (stcb->block_entry) {
4785                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_PCB, ECONNRESET);
4786                         stcb->block_entry->error = ECONNRESET;
4787                         stcb->block_entry = NULL;
4788                 }
4789         }
4790         if ((stcb->asoc.refcnt) || (stcb->asoc.state & SCTP_STATE_IN_ACCEPT_QUEUE)) {
4791                 /*
4792                  * Someone holds a reference OR the socket is unaccepted
4793                  * yet.
4794                  */
4795                 if ((stcb->asoc.refcnt) ||
4796                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
4797                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE)) {
4798                         SCTP_CLEAR_SUBSTATE(stcb, SCTP_STATE_IN_ACCEPT_QUEUE);
4799                         sctp_timer_start(SCTP_TIMER_TYPE_ASOCKILL, inp, stcb, NULL);
4800                 }
4801                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
4802                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE))
4803                         /* nothing around */
4804                         so = NULL;
4805                 if (so) {
4806                         /* Wake any reader/writers */
4807                         sctp_sorwakeup(inp, so);
4808                         sctp_sowwakeup(inp, so);
4809                 }
4810                 SCTP_TCB_SEND_UNLOCK(stcb);
4811                 SCTP_TCB_UNLOCK(stcb);
4812
4813 #ifdef SCTP_LOG_CLOSING
4814                 sctp_log_closing(inp, stcb, 9);
4815 #endif
4816                 /* no asoc destroyed */
4817                 return (0);
4818         }
4819 #ifdef SCTP_LOG_CLOSING
4820         sctp_log_closing(inp, stcb, 10);
4821 #endif
4822         /*
4823          * When I reach here, no others want to kill the assoc yet.. and I
4824          * own the lock. Now its possible an abort comes in when I do the
4825          * lock exchange below to grab all the locks to do the final take
4826          * out. to prevent this we increment the count, which will start a
4827          * timer and blow out above thus assuring us that we hold exclusive
4828          * killing of the asoc. Note that after getting back the TCB lock we
4829          * will go ahead and increment the counter back up and stop any
4830          * timer a passing stranger may have started :-S
4831          */
4832         if (from_inpcbfree == SCTP_NORMAL_PROC) {
4833                 atomic_add_int(&stcb->asoc.refcnt, 1);
4834
4835                 SCTP_TCB_SEND_UNLOCK(stcb);
4836                 SCTP_TCB_UNLOCK(stcb);
4837                 SCTP_INP_INFO_WLOCK();
4838                 SCTP_INP_WLOCK(inp);
4839                 SCTP_TCB_LOCK(stcb);
4840                 SCTP_TCB_SEND_LOCK(stcb);
4841         }
4842         /* Double check the GONE flag */
4843         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
4844             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE))
4845                 /* nothing around */
4846                 so = NULL;
4847
4848         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
4849             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
4850                 /*
4851                  * For TCP type we need special handling when we are
4852                  * connected. We also include the peel'ed off ones to.
4853                  */
4854                 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
4855                         inp->sctp_flags &= ~SCTP_PCB_FLAGS_CONNECTED;
4856                         inp->sctp_flags |= SCTP_PCB_FLAGS_WAS_CONNECTED;
4857                         if (so) {
4858                                 SOCKBUF_LOCK(&so->so_rcv);
4859                                 so->so_state &= ~(SS_ISCONNECTING |
4860                                     SS_ISDISCONNECTING |
4861                                     SS_ISCONFIRMING |
4862                                     SS_ISCONNECTED);
4863                                 so->so_state |= SS_ISDISCONNECTED;
4864                                 socantrcvmore_locked(so);
4865                                 socantsendmore(so);
4866                                 sctp_sowwakeup(inp, so);
4867                                 sctp_sorwakeup(inp, so);
4868                                 SCTP_SOWAKEUP(so);
4869                         }
4870                 }
4871         }
4872
4873         /*
4874          * Make it invalid too, that way if its about to run it will abort
4875          * and return.
4876          */
4877         /* re-increment the lock */
4878         if (from_inpcbfree == SCTP_NORMAL_PROC) {
4879                 atomic_add_int(&stcb->asoc.refcnt, -1);
4880         }
4881         if (stcb->asoc.refcnt) {
4882                 SCTP_CLEAR_SUBSTATE(stcb, SCTP_STATE_IN_ACCEPT_QUEUE);
4883                 sctp_timer_start(SCTP_TIMER_TYPE_ASOCKILL, inp, stcb, NULL);
4884                 if (from_inpcbfree == SCTP_NORMAL_PROC) {
4885                         SCTP_INP_INFO_WUNLOCK();
4886                         SCTP_INP_WUNLOCK(inp);
4887                 }
4888                 SCTP_TCB_SEND_UNLOCK(stcb);
4889                 SCTP_TCB_UNLOCK(stcb);
4890                 return (0);
4891         }
4892         asoc->state = 0;
4893         if (inp->sctp_tcbhash) {
4894                 LIST_REMOVE(stcb, sctp_tcbhash);
4895         }
4896         if (stcb->asoc.in_asocid_hash) {
4897                 LIST_REMOVE(stcb, sctp_tcbasocidhash);
4898         }
4899         if (inp->sctp_socket == NULL) {
4900                 stcb->sctp_socket = NULL;
4901         }
4902         /* Now lets remove it from the list of ALL associations in the EP */
4903         LIST_REMOVE(stcb, sctp_tcblist);
4904         if (from_inpcbfree == SCTP_NORMAL_PROC) {
4905                 SCTP_INP_INCR_REF(inp);
4906                 SCTP_INP_WUNLOCK(inp);
4907         }
4908         /* pull from vtag hash */
4909         LIST_REMOVE(stcb, sctp_asocs);
4910         sctp_add_vtag_to_timewait(asoc->my_vtag, SCTP_BASE_SYSCTL(sctp_vtag_time_wait),
4911             inp->sctp_lport, stcb->rport);
4912
4913         /*
4914          * Now restop the timers to be sure this is paranoia at is finest!
4915          */
4916         sctp_stop_association_timers(stcb, true);
4917
4918         /*
4919          * The chunk lists and such SHOULD be empty but we check them just
4920          * in case.
4921          */
4922         /* anything on the wheel needs to be removed */
4923         for (i = 0; i < asoc->streamoutcnt; i++) {
4924                 struct sctp_stream_out *outs;
4925
4926                 outs = &asoc->strmout[i];
4927                 /* now clean up any chunks here */
4928                 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) {
4929                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
4930                         TAILQ_REMOVE(&outs->outqueue, sp, next);
4931                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp, 1);
4932                         sctp_free_spbufspace(stcb, asoc, sp);
4933                         if (sp->data) {
4934                                 if (so) {
4935                                         /* Still an open socket - report */
4936                                         sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, stcb,
4937                                             0, (void *)sp, SCTP_SO_LOCKED);
4938                                 }
4939                                 if (sp->data) {
4940                                         sctp_m_freem(sp->data);
4941                                         sp->data = NULL;
4942                                         sp->tail_mbuf = NULL;
4943                                         sp->length = 0;
4944                                 }
4945                         }
4946                         if (sp->net) {
4947                                 sctp_free_remote_addr(sp->net);
4948                                 sp->net = NULL;
4949                         }
4950                         sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
4951                 }
4952         }
4953         /* sa_ignore FREED_MEMORY */
4954         TAILQ_FOREACH_SAFE(strrst, &asoc->resetHead, next_resp, nstrrst) {
4955                 TAILQ_REMOVE(&asoc->resetHead, strrst, next_resp);
4956                 SCTP_FREE(strrst, SCTP_M_STRESET);
4957         }
4958         TAILQ_FOREACH_SAFE(sq, &asoc->pending_reply_queue, next, nsq) {
4959                 TAILQ_REMOVE(&asoc->pending_reply_queue, sq, next);
4960                 if (sq->data) {
4961                         sctp_m_freem(sq->data);
4962                         sq->data = NULL;
4963                 }
4964                 sctp_free_remote_addr(sq->whoFrom);
4965                 sq->whoFrom = NULL;
4966                 sq->stcb = NULL;
4967                 /* Free the ctl entry */
4968                 sctp_free_a_readq(stcb, sq);
4969                 /* sa_ignore FREED_MEMORY */
4970         }
4971         TAILQ_FOREACH_SAFE(chk, &asoc->free_chunks, sctp_next, nchk) {
4972                 TAILQ_REMOVE(&asoc->free_chunks, chk, sctp_next);
4973                 if (chk->data) {
4974                         sctp_m_freem(chk->data);
4975                         chk->data = NULL;
4976                 }
4977                 if (chk->holds_key_ref)
4978                         sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED);
4979                 SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk);
4980                 SCTP_DECR_CHK_COUNT();
4981                 atomic_subtract_int(&SCTP_BASE_INFO(ipi_free_chunks), 1);
4982                 asoc->free_chunk_cnt--;
4983                 /* sa_ignore FREED_MEMORY */
4984         }
4985         /* pending send queue SHOULD be empty */
4986         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
4987                 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) {
4988                         asoc->strmout[chk->rec.data.sid].chunks_on_queues--;
4989 #ifdef INVARIANTS
4990                 } else {
4991                         panic("No chunks on the queues for sid %u.", chk->rec.data.sid);
4992 #endif
4993                 }
4994                 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
4995                 if (chk->data) {
4996                         if (so) {
4997                                 /* Still a socket? */
4998                                 sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb,
4999                                     0, chk, SCTP_SO_LOCKED);
5000                         }
5001                         if (chk->data) {
5002                                 sctp_m_freem(chk->data);
5003                                 chk->data = NULL;
5004                         }
5005                 }
5006                 if (chk->holds_key_ref)
5007                         sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED);
5008                 if (chk->whoTo) {
5009                         sctp_free_remote_addr(chk->whoTo);
5010                         chk->whoTo = NULL;
5011                 }
5012                 SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk);
5013                 SCTP_DECR_CHK_COUNT();
5014                 /* sa_ignore FREED_MEMORY */
5015         }
5016         /* sent queue SHOULD be empty */
5017         TAILQ_FOREACH_SAFE(chk, &asoc->sent_queue, sctp_next, nchk) {
5018                 if (chk->sent != SCTP_DATAGRAM_NR_ACKED) {
5019                         if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) {
5020                                 asoc->strmout[chk->rec.data.sid].chunks_on_queues--;
5021 #ifdef INVARIANTS
5022                         } else {
5023                                 panic("No chunks on the queues for sid %u.", chk->rec.data.sid);
5024 #endif
5025                         }
5026                 }
5027                 TAILQ_REMOVE(&asoc->sent_queue, chk, sctp_next);
5028                 if (chk->data) {
5029                         if (so) {
5030                                 /* Still a socket? */
5031                                 sctp_ulp_notify(SCTP_NOTIFY_SENT_DG_FAIL, stcb,
5032                                     0, chk, SCTP_SO_LOCKED);
5033                         }
5034                         if (chk->data) {
5035                                 sctp_m_freem(chk->data);
5036                                 chk->data = NULL;
5037                         }
5038                 }
5039                 if (chk->holds_key_ref)
5040                         sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED);
5041                 sctp_free_remote_addr(chk->whoTo);
5042                 SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk);
5043                 SCTP_DECR_CHK_COUNT();
5044                 /* sa_ignore FREED_MEMORY */
5045         }
5046 #ifdef INVARIANTS
5047         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
5048                 if (stcb->asoc.strmout[i].chunks_on_queues > 0) {
5049                         panic("%u chunks left for stream %u.", stcb->asoc.strmout[i].chunks_on_queues, i);
5050                 }
5051         }
5052 #endif
5053         /* control queue MAY not be empty */
5054         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
5055                 TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
5056                 if (chk->data) {
5057                         sctp_m_freem(chk->data);
5058                         chk->data = NULL;
5059                 }
5060                 if (chk->holds_key_ref)
5061                         sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED);
5062                 sctp_free_remote_addr(chk->whoTo);
5063                 SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk);
5064                 SCTP_DECR_CHK_COUNT();
5065                 /* sa_ignore FREED_MEMORY */
5066         }
5067         /* ASCONF queue MAY not be empty */
5068         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
5069                 TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
5070                 if (chk->data) {
5071                         sctp_m_freem(chk->data);
5072                         chk->data = NULL;
5073                 }
5074                 if (chk->holds_key_ref)
5075                         sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED);
5076                 sctp_free_remote_addr(chk->whoTo);
5077                 SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk);
5078                 SCTP_DECR_CHK_COUNT();
5079                 /* sa_ignore FREED_MEMORY */
5080         }
5081         if (asoc->mapping_array) {
5082                 SCTP_FREE(asoc->mapping_array, SCTP_M_MAP);
5083                 asoc->mapping_array = NULL;
5084         }
5085         if (asoc->nr_mapping_array) {
5086                 SCTP_FREE(asoc->nr_mapping_array, SCTP_M_MAP);
5087                 asoc->nr_mapping_array = NULL;
5088         }
5089         /* the stream outs */
5090         if (asoc->strmout) {
5091                 SCTP_FREE(asoc->strmout, SCTP_M_STRMO);
5092                 asoc->strmout = NULL;
5093         }
5094         asoc->strm_realoutsize = asoc->streamoutcnt = 0;
5095         if (asoc->strmin) {
5096                 for (i = 0; i < asoc->streamincnt; i++) {
5097                         sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue);
5098                         sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue);
5099                 }
5100                 SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
5101                 asoc->strmin = NULL;
5102         }
5103         asoc->streamincnt = 0;
5104         TAILQ_FOREACH_SAFE(net, &asoc->nets, sctp_next, nnet) {
5105 #ifdef INVARIANTS
5106                 if (SCTP_BASE_INFO(ipi_count_raddr) == 0) {
5107                         panic("no net's left alloc'ed, or list points to itself");
5108                 }
5109 #endif
5110                 TAILQ_REMOVE(&asoc->nets, net, sctp_next);
5111                 sctp_free_remote_addr(net);
5112         }
5113         LIST_FOREACH_SAFE(laddr, &asoc->sctp_restricted_addrs, sctp_nxt_addr, naddr) {
5114                 /* sa_ignore FREED_MEMORY */
5115                 sctp_remove_laddr(laddr);
5116         }
5117
5118         /* pending asconf (address) parameters */
5119         TAILQ_FOREACH_SAFE(aparam, &asoc->asconf_queue, next, naparam) {
5120                 /* sa_ignore FREED_MEMORY */
5121                 TAILQ_REMOVE(&asoc->asconf_queue, aparam, next);
5122                 SCTP_FREE(aparam, SCTP_M_ASC_ADDR);
5123         }
5124         TAILQ_FOREACH_SAFE(aack, &asoc->asconf_ack_sent, next, naack) {
5125                 /* sa_ignore FREED_MEMORY */
5126                 TAILQ_REMOVE(&asoc->asconf_ack_sent, aack, next);
5127                 if (aack->data != NULL) {
5128                         sctp_m_freem(aack->data);
5129                 }
5130                 SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_asconf_ack), aack);
5131         }
5132         /* clean up auth stuff */
5133         if (asoc->local_hmacs)
5134                 sctp_free_hmaclist(asoc->local_hmacs);
5135         if (asoc->peer_hmacs)
5136                 sctp_free_hmaclist(asoc->peer_hmacs);
5137
5138         if (asoc->local_auth_chunks)
5139                 sctp_free_chunklist(asoc->local_auth_chunks);
5140         if (asoc->peer_auth_chunks)
5141                 sctp_free_chunklist(asoc->peer_auth_chunks);
5142
5143         sctp_free_authinfo(&asoc->authinfo);
5144
5145         LIST_FOREACH_SAFE(shared_key, &asoc->shared_keys, next, nshared_key) {
5146                 LIST_REMOVE(shared_key, next);
5147                 sctp_free_sharedkey(shared_key);
5148                 /* sa_ignore FREED_MEMORY */
5149         }
5150
5151         /* Insert new items here :> */
5152
5153         /* Get rid of LOCK */
5154         SCTP_TCB_SEND_UNLOCK(stcb);
5155         SCTP_TCB_UNLOCK(stcb);
5156         SCTP_TCB_LOCK_DESTROY(stcb);
5157         SCTP_TCB_SEND_LOCK_DESTROY(stcb);
5158         if (from_inpcbfree == SCTP_NORMAL_PROC) {
5159                 SCTP_INP_INFO_WUNLOCK();
5160                 SCTP_INP_RLOCK(inp);
5161         }
5162 #ifdef SCTP_TRACK_FREED_ASOCS
5163         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5164                 /* now clean up the tasoc itself */
5165                 SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_asoc), stcb);
5166                 SCTP_DECR_ASOC_COUNT();
5167         } else {
5168                 LIST_INSERT_HEAD(&inp->sctp_asoc_free_list, stcb, sctp_tcblist);
5169         }
5170 #else
5171         SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_asoc), stcb);
5172         SCTP_DECR_ASOC_COUNT();
5173 #endif
5174         if (from_inpcbfree == SCTP_NORMAL_PROC) {
5175                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5176                         /*
5177                          * If its NOT the inp_free calling us AND sctp_close
5178                          * as been called, we call back...
5179                          */
5180                         SCTP_INP_RUNLOCK(inp);
5181                         /*
5182                          * This will start the kill timer (if we are the
5183                          * last one) since we hold an increment yet. But
5184                          * this is the only safe way to do this since
5185                          * otherwise if the socket closes at the same time
5186                          * we are here we might collide in the cleanup.
5187                          */
5188                         sctp_inpcb_free(inp,
5189                             SCTP_FREE_SHOULD_USE_GRACEFUL_CLOSE,
5190                             SCTP_CALLED_DIRECTLY_NOCMPSET);
5191                         SCTP_INP_DECR_REF(inp);
5192                 } else {
5193                         /* The socket is still open. */
5194                         SCTP_INP_DECR_REF(inp);
5195                         SCTP_INP_RUNLOCK(inp);
5196                 }
5197         }
5198         /* destroyed the asoc */
5199 #ifdef SCTP_LOG_CLOSING
5200         sctp_log_closing(inp, NULL, 11);
5201 #endif
5202         return (1);
5203 }
5204
5205 /*
5206  * determine if a destination is "reachable" based upon the addresses bound
5207  * to the current endpoint (e.g. only v4 or v6 currently bound)
5208  */
5209 /*
5210  * FIX: if we allow assoc-level bindx(), then this needs to be fixed to use
5211  * assoc level v4/v6 flags, as the assoc *may* not have the same address
5212  * types bound as its endpoint
5213  */
5214 int
5215 sctp_destination_is_reachable(struct sctp_tcb *stcb, struct sockaddr *destaddr)
5216 {
5217         struct sctp_inpcb *inp;
5218         int answer;
5219
5220         /*
5221          * No locks here, the TCB, in all cases is already locked and an
5222          * assoc is up. There is either a INP lock by the caller applied (in
5223          * asconf case when deleting an address) or NOT in the HB case,
5224          * however if HB then the INP increment is up and the INP will not
5225          * be removed (on top of the fact that we have a TCB lock). So we
5226          * only want to read the sctp_flags, which is either bound-all or
5227          * not.. no protection needed since once an assoc is up you can't be
5228          * changing your binding.
5229          */
5230         inp = stcb->sctp_ep;
5231         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
5232                 /* if bound all, destination is not restricted */
5233                 /*
5234                  * RRS: Question during lock work: Is this correct? If you
5235                  * are bound-all you still might need to obey the V4--V6
5236                  * flags??? IMO this bound-all stuff needs to be removed!
5237                  */
5238                 return (1);
5239         }
5240         /* NOTE: all "scope" checks are done when local addresses are added */
5241         switch (destaddr->sa_family) {
5242 #ifdef INET6
5243         case AF_INET6:
5244                 answer = inp->ip_inp.inp.inp_vflag & INP_IPV6;
5245                 break;
5246 #endif
5247 #ifdef INET
5248         case AF_INET:
5249                 answer = inp->ip_inp.inp.inp_vflag & INP_IPV4;
5250                 break;
5251 #endif
5252         default:
5253                 /* invalid family, so it's unreachable */
5254                 answer = 0;
5255                 break;
5256         }
5257         return (answer);
5258 }
5259
5260 /*
5261  * update the inp_vflags on an endpoint
5262  */
5263 static void
5264 sctp_update_ep_vflag(struct sctp_inpcb *inp)
5265 {
5266         struct sctp_laddr *laddr;
5267
5268         /* first clear the flag */
5269         inp->ip_inp.inp.inp_vflag = 0;
5270         /* set the flag based on addresses on the ep list */
5271         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
5272                 if (laddr->ifa == NULL) {
5273                         SCTPDBG(SCTP_DEBUG_PCB1, "%s: NULL ifa\n",
5274                             __func__);
5275                         continue;
5276                 }
5277
5278                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
5279                         continue;
5280                 }
5281                 switch (laddr->ifa->address.sa.sa_family) {
5282 #ifdef INET6
5283                 case AF_INET6:
5284                         inp->ip_inp.inp.inp_vflag |= INP_IPV6;
5285                         break;
5286 #endif
5287 #ifdef INET
5288                 case AF_INET:
5289                         inp->ip_inp.inp.inp_vflag |= INP_IPV4;
5290                         break;
5291 #endif
5292                 default:
5293                         break;
5294                 }
5295         }
5296 }
5297
5298 /*
5299  * Add the address to the endpoint local address list There is nothing to be
5300  * done if we are bound to all addresses
5301  */
5302 void
5303 sctp_add_local_addr_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa, uint32_t action)
5304 {
5305         struct sctp_laddr *laddr;
5306         struct sctp_tcb *stcb;
5307         int fnd, error = 0;
5308
5309         fnd = 0;
5310
5311         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
5312                 /* You are already bound to all. You have it already */
5313                 return;
5314         }
5315 #ifdef INET6
5316         if (ifa->address.sa.sa_family == AF_INET6) {
5317                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
5318                         /* Can't bind a non-useable addr. */
5319                         return;
5320                 }
5321         }
5322 #endif
5323         /* first, is it already present? */
5324         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
5325                 if (laddr->ifa == ifa) {
5326                         fnd = 1;
5327                         break;
5328                 }
5329         }
5330
5331         if (fnd == 0) {
5332                 /* Not in the ep list */
5333                 error = sctp_insert_laddr(&inp->sctp_addr_list, ifa, action);
5334                 if (error != 0)
5335                         return;
5336                 inp->laddr_count++;
5337                 /* update inp_vflag flags */
5338                 switch (ifa->address.sa.sa_family) {
5339 #ifdef INET6
5340                 case AF_INET6:
5341                         inp->ip_inp.inp.inp_vflag |= INP_IPV6;
5342                         break;
5343 #endif
5344 #ifdef INET
5345                 case AF_INET:
5346                         inp->ip_inp.inp.inp_vflag |= INP_IPV4;
5347                         break;
5348 #endif
5349                 default:
5350                         break;
5351                 }
5352                 LIST_FOREACH(stcb, &inp->sctp_asoc_list, sctp_tcblist) {
5353                         sctp_add_local_addr_restricted(stcb, ifa);
5354                 }
5355         }
5356         return;
5357 }
5358
5359 /*
5360  * select a new (hopefully reachable) destination net (should only be used
5361  * when we deleted an ep addr that is the only usable source address to reach
5362  * the destination net)
5363  */
5364 static void
5365 sctp_select_primary_destination(struct sctp_tcb *stcb)
5366 {
5367         struct sctp_nets *net;
5368
5369         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
5370                 /* for now, we'll just pick the first reachable one we find */
5371                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED)
5372                         continue;
5373                 if (sctp_destination_is_reachable(stcb,
5374                     (struct sockaddr *)&net->ro._l_addr)) {
5375                         /* found a reachable destination */
5376                         stcb->asoc.primary_destination = net;
5377                 }
5378         }
5379         /* I can't there from here! ...we're gonna die shortly... */
5380 }
5381
5382 /*
5383  * Delete the address from the endpoint local address list. There is nothing
5384  * to be done if we are bound to all addresses
5385  */
5386 void
5387 sctp_del_local_addr_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
5388 {
5389         struct sctp_laddr *laddr;
5390         int fnd;
5391
5392         fnd = 0;
5393         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
5394                 /* You are already bound to all. You have it already */
5395                 return;
5396         }
5397         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
5398                 if (laddr->ifa == ifa) {
5399                         fnd = 1;
5400                         break;
5401                 }
5402         }
5403         if (fnd && (inp->laddr_count < 2)) {
5404                 /* can't delete unless there are at LEAST 2 addresses */
5405                 return;
5406         }
5407         if (fnd) {
5408                 /*
5409                  * clean up any use of this address go through our
5410                  * associations and clear any last_used_address that match
5411                  * this one for each assoc, see if a new primary_destination
5412                  * is needed
5413                  */
5414                 struct sctp_tcb *stcb;
5415
5416                 /* clean up "next_addr_touse" */
5417                 if (inp->next_addr_touse == laddr)
5418                         /* delete this address */
5419                         inp->next_addr_touse = NULL;
5420
5421                 /* clean up "last_used_address" */
5422                 LIST_FOREACH(stcb, &inp->sctp_asoc_list, sctp_tcblist) {
5423                         struct sctp_nets *net;
5424
5425                         SCTP_TCB_LOCK(stcb);
5426                         if (stcb->asoc.last_used_address == laddr)
5427                                 /* delete this address */
5428                                 stcb->asoc.last_used_address = NULL;
5429                         /*
5430                          * Now spin through all the nets and purge any ref
5431                          * to laddr
5432                          */
5433                         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
5434                                 if (net->ro._s_addr == laddr->ifa) {
5435                                         /* Yep, purge src address selected */
5436                                         RO_NHFREE(&net->ro);
5437                                         sctp_free_ifa(net->ro._s_addr);
5438                                         net->ro._s_addr = NULL;
5439                                         net->src_addr_selected = 0;
5440                                 }
5441                         }
5442                         SCTP_TCB_UNLOCK(stcb);
5443                 }               /* for each tcb */
5444                 /* remove it from the ep list */
5445                 sctp_remove_laddr(laddr);
5446                 inp->laddr_count--;
5447                 /* update inp_vflag flags */
5448                 sctp_update_ep_vflag(inp);
5449         }
5450         return;
5451 }
5452
5453 /*
5454  * Add the address to the TCB local address restricted list.
5455  * This is a "pending" address list (eg. addresses waiting for an
5456  * ASCONF-ACK response) and cannot be used as a valid source address.
5457  */
5458 void
5459 sctp_add_local_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
5460 {
5461         struct sctp_laddr *laddr;
5462         struct sctpladdr *list;
5463
5464         /*
5465          * Assumes TCB is locked.. and possibly the INP. May need to
5466          * confirm/fix that if we need it and is not the case.
5467          */
5468         list = &stcb->asoc.sctp_restricted_addrs;
5469
5470 #ifdef INET6
5471         if (ifa->address.sa.sa_family == AF_INET6) {
5472                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
5473                         /* Can't bind a non-existent addr. */
5474                         return;
5475                 }
5476         }
5477 #endif
5478         /* does the address already exist? */
5479         LIST_FOREACH(laddr, list, sctp_nxt_addr) {
5480                 if (laddr->ifa == ifa) {
5481                         return;
5482                 }
5483         }
5484
5485         /* add to the list */
5486         (void)sctp_insert_laddr(list, ifa, 0);
5487         return;
5488 }
5489
5490 /*
5491  * Remove a local address from the TCB local address restricted list
5492  */
5493 void
5494 sctp_del_local_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
5495 {
5496         struct sctp_inpcb *inp;
5497         struct sctp_laddr *laddr;
5498
5499         /*
5500          * This is called by asconf work. It is assumed that a) The TCB is
5501          * locked and b) The INP is locked. This is true in as much as I can
5502          * trace through the entry asconf code where I did these locks.
5503          * Again, the ASCONF code is a bit different in that it does lock
5504          * the INP during its work often times. This must be since we don't
5505          * want other proc's looking up things while what they are looking
5506          * up is changing :-D
5507          */
5508
5509         inp = stcb->sctp_ep;
5510         /* if subset bound and don't allow ASCONF's, can't delete last */
5511         if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) == 0) &&
5512             sctp_is_feature_off(inp, SCTP_PCB_FLAGS_DO_ASCONF)) {
5513                 if (stcb->sctp_ep->laddr_count < 2) {
5514                         /* can't delete last address */
5515                         return;
5516                 }
5517         }
5518         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
5519                 /* remove the address if it exists */
5520                 if (laddr->ifa == NULL)
5521                         continue;
5522                 if (laddr->ifa == ifa) {
5523                         sctp_remove_laddr(laddr);
5524                         return;
5525                 }
5526         }
5527
5528         /* address not found! */
5529         return;
5530 }
5531
5532 /* sysctl */
5533 static int sctp_max_number_of_assoc = SCTP_MAX_NUM_OF_ASOC;
5534 static int sctp_scale_up_for_address = SCTP_SCALE_FOR_ADDR;
5535
5536 #if defined(SCTP_MCORE_INPUT) && defined(SMP)
5537 struct sctp_mcore_ctrl *sctp_mcore_workers = NULL;
5538 int *sctp_cpuarry = NULL;
5539
5540 void
5541 sctp_queue_to_mcore(struct mbuf *m, int off, int cpu_to_use)
5542 {
5543         /* Queue a packet to a processor for the specified core */
5544         struct sctp_mcore_queue *qent;
5545         struct sctp_mcore_ctrl *wkq;
5546         int need_wake = 0;
5547
5548         if (sctp_mcore_workers == NULL) {
5549                 /* Something went way bad during setup */
5550                 sctp_input_with_port(m, off, 0);
5551                 return;
5552         }
5553         SCTP_MALLOC(qent, struct sctp_mcore_queue *,
5554             (sizeof(struct sctp_mcore_queue)),
5555             SCTP_M_MCORE);
5556         if (qent == NULL) {
5557                 /* This is trouble  */
5558                 sctp_input_with_port(m, off, 0);
5559                 return;
5560         }
5561         qent->vn = curvnet;
5562         qent->m = m;
5563         qent->off = off;
5564         qent->v6 = 0;
5565         wkq = &sctp_mcore_workers[cpu_to_use];
5566         SCTP_MCORE_QLOCK(wkq);
5567
5568         TAILQ_INSERT_TAIL(&wkq->que, qent, next);
5569         if (wkq->running == 0) {
5570                 need_wake = 1;
5571         }
5572         SCTP_MCORE_QUNLOCK(wkq);
5573         if (need_wake) {
5574                 wakeup(&wkq->running);
5575         }
5576 }
5577
5578 static void
5579 sctp_mcore_thread(void *arg)
5580 {
5581
5582         struct sctp_mcore_ctrl *wkq;
5583         struct sctp_mcore_queue *qent;
5584
5585         wkq = (struct sctp_mcore_ctrl *)arg;
5586         struct mbuf *m;
5587         int off, v6;
5588
5589         /* Wait for first tickle */
5590         SCTP_MCORE_LOCK(wkq);
5591         wkq->running = 0;
5592         msleep(&wkq->running,
5593             &wkq->core_mtx,
5594             0, "wait for pkt", 0);
5595         SCTP_MCORE_UNLOCK(wkq);
5596
5597         /* Bind to our cpu */
5598         thread_lock(curthread);
5599         sched_bind(curthread, wkq->cpuid);
5600         thread_unlock(curthread);
5601
5602         /* Now lets start working */
5603         SCTP_MCORE_LOCK(wkq);
5604         /* Now grab lock and go */
5605         for (;;) {
5606                 SCTP_MCORE_QLOCK(wkq);
5607 skip_sleep:
5608                 wkq->running = 1;
5609                 qent = TAILQ_FIRST(&wkq->que);
5610                 if (qent) {
5611                         TAILQ_REMOVE(&wkq->que, qent, next);
5612                         SCTP_MCORE_QUNLOCK(wkq);
5613                         CURVNET_SET(qent->vn);
5614                         m = qent->m;
5615                         off = qent->off;
5616                         v6 = qent->v6;
5617                         SCTP_FREE(qent, SCTP_M_MCORE);
5618                         if (v6 == 0) {
5619                                 sctp_input_with_port(m, off, 0);
5620                         } else {
5621                                 SCTP_PRINTF("V6 not yet supported\n");
5622                                 sctp_m_freem(m);
5623                         }
5624                         CURVNET_RESTORE();
5625                         SCTP_MCORE_QLOCK(wkq);
5626                 }
5627                 wkq->running = 0;
5628                 if (!TAILQ_EMPTY(&wkq->que)) {
5629                         goto skip_sleep;
5630                 }
5631                 SCTP_MCORE_QUNLOCK(wkq);
5632                 msleep(&wkq->running,
5633                     &wkq->core_mtx,
5634                     0, "wait for pkt", 0);
5635         }
5636 }
5637
5638 static void
5639 sctp_startup_mcore_threads(void)
5640 {
5641         int i, cpu;
5642
5643         if (mp_ncpus == 1)
5644                 return;
5645
5646         if (sctp_mcore_workers != NULL) {
5647                 /*
5648                  * Already been here in some previous vnet?
5649                  */
5650                 return;
5651         }
5652         SCTP_MALLOC(sctp_mcore_workers, struct sctp_mcore_ctrl *,
5653             ((mp_maxid + 1) * sizeof(struct sctp_mcore_ctrl)),
5654             SCTP_M_MCORE);
5655         if (sctp_mcore_workers == NULL) {
5656                 /* TSNH I hope */
5657                 return;
5658         }
5659         memset(sctp_mcore_workers, 0, ((mp_maxid + 1) *
5660             sizeof(struct sctp_mcore_ctrl)));
5661         /* Init the structures */
5662         for (i = 0; i <= mp_maxid; i++) {
5663                 TAILQ_INIT(&sctp_mcore_workers[i].que);
5664                 SCTP_MCORE_LOCK_INIT(&sctp_mcore_workers[i]);
5665                 SCTP_MCORE_QLOCK_INIT(&sctp_mcore_workers[i]);
5666                 sctp_mcore_workers[i].cpuid = i;
5667         }
5668         if (sctp_cpuarry == NULL) {
5669                 SCTP_MALLOC(sctp_cpuarry, int *,
5670                     (mp_ncpus * sizeof(int)),
5671                     SCTP_M_MCORE);
5672                 i = 0;
5673                 CPU_FOREACH(cpu) {
5674                         sctp_cpuarry[i] = cpu;
5675                         i++;
5676                 }
5677         }
5678         /* Now start them all */
5679         CPU_FOREACH(cpu) {
5680                 (void)kproc_create(sctp_mcore_thread,
5681                     (void *)&sctp_mcore_workers[cpu],
5682                     &sctp_mcore_workers[cpu].thread_proc,
5683                     0,
5684                     SCTP_KTHREAD_PAGES,
5685                     SCTP_MCORE_NAME);
5686         }
5687 }
5688 #endif
5689
5690 void
5691 sctp_pcb_init(void)
5692 {
5693         /*
5694          * SCTP initialization for the PCB structures should be called by
5695          * the sctp_init() function.
5696          */
5697         int i;
5698         struct timeval tv;
5699
5700         if (SCTP_BASE_VAR(sctp_pcb_initialized) != 0) {
5701                 /* error I was called twice */
5702                 return;
5703         }
5704         SCTP_BASE_VAR(sctp_pcb_initialized) = 1;
5705
5706 #if defined(SCTP_LOCAL_TRACE_BUF)
5707         memset(&SCTP_BASE_SYSCTL(sctp_log), 0, sizeof(struct sctp_log));
5708 #endif
5709 #if defined(SMP) && defined(SCTP_USE_PERCPU_STAT)
5710         SCTP_MALLOC(SCTP_BASE_STATS, struct sctpstat *,
5711             ((mp_maxid + 1) * sizeof(struct sctpstat)),
5712             SCTP_M_MCORE);
5713 #endif
5714         (void)SCTP_GETTIME_TIMEVAL(&tv);
5715 #if defined(SMP) && defined(SCTP_USE_PERCPU_STAT)
5716         memset(SCTP_BASE_STATS, 0, sizeof(struct sctpstat) * (mp_maxid + 1));
5717         SCTP_BASE_STATS[PCPU_GET(cpuid)].sctps_discontinuitytime.tv_sec = (uint32_t)tv.tv_sec;
5718         SCTP_BASE_STATS[PCPU_GET(cpuid)].sctps_discontinuitytime.tv_usec = (uint32_t)tv.tv_usec;
5719 #else
5720         memset(&SCTP_BASE_STATS, 0, sizeof(struct sctpstat));
5721         SCTP_BASE_STAT(sctps_discontinuitytime).tv_sec = (uint32_t)tv.tv_sec;
5722         SCTP_BASE_STAT(sctps_discontinuitytime).tv_usec = (uint32_t)tv.tv_usec;
5723 #endif
5724         /* init the empty list of (All) Endpoints */
5725         LIST_INIT(&SCTP_BASE_INFO(listhead));
5726
5727         /* init the hash table of endpoints */
5728         TUNABLE_INT_FETCH("net.inet.sctp.tcbhashsize", &SCTP_BASE_SYSCTL(sctp_hashtblsize));
5729         TUNABLE_INT_FETCH("net.inet.sctp.pcbhashsize", &SCTP_BASE_SYSCTL(sctp_pcbtblsize));
5730         TUNABLE_INT_FETCH("net.inet.sctp.chunkscale", &SCTP_BASE_SYSCTL(sctp_chunkscale));
5731         SCTP_BASE_INFO(sctp_asochash) = SCTP_HASH_INIT((SCTP_BASE_SYSCTL(sctp_hashtblsize) * 31),
5732             &SCTP_BASE_INFO(hashasocmark));
5733         SCTP_BASE_INFO(sctp_ephash) = SCTP_HASH_INIT(SCTP_BASE_SYSCTL(sctp_hashtblsize),
5734             &SCTP_BASE_INFO(hashmark));
5735         SCTP_BASE_INFO(sctp_tcpephash) = SCTP_HASH_INIT(SCTP_BASE_SYSCTL(sctp_hashtblsize),
5736             &SCTP_BASE_INFO(hashtcpmark));
5737         SCTP_BASE_INFO(hashtblsize) = SCTP_BASE_SYSCTL(sctp_hashtblsize);
5738         SCTP_BASE_INFO(sctp_vrfhash) = SCTP_HASH_INIT(SCTP_SIZE_OF_VRF_HASH,
5739             &SCTP_BASE_INFO(hashvrfmark));
5740
5741         SCTP_BASE_INFO(vrf_ifn_hash) = SCTP_HASH_INIT(SCTP_VRF_IFN_HASH_SIZE,
5742             &SCTP_BASE_INFO(vrf_ifn_hashmark));
5743         /* init the zones */
5744         /*
5745          * FIX ME: Should check for NULL returns, but if it does fail we are
5746          * doomed to panic anyways... add later maybe.
5747          */
5748         SCTP_ZONE_INIT(SCTP_BASE_INFO(ipi_zone_ep), "sctp_ep",
5749             sizeof(struct sctp_inpcb), maxsockets);
5750
5751         SCTP_ZONE_INIT(SCTP_BASE_INFO(ipi_zone_asoc), "sctp_asoc",
5752             sizeof(struct sctp_tcb), sctp_max_number_of_assoc);
5753
5754         SCTP_ZONE_INIT(SCTP_BASE_INFO(ipi_zone_laddr), "sctp_laddr",
5755             sizeof(struct sctp_laddr),
5756             (sctp_max_number_of_assoc * sctp_scale_up_for_address));
5757
5758         SCTP_ZONE_INIT(SCTP_BASE_INFO(ipi_zone_net), "sctp_raddr",
5759             sizeof(struct sctp_nets),
5760             (sctp_max_number_of_assoc * sctp_scale_up_for_address));
5761
5762         SCTP_ZONE_INIT(SCTP_BASE_INFO(ipi_zone_chunk), "sctp_chunk",
5763             sizeof(struct sctp_tmit_chunk),
5764             (sctp_max_number_of_assoc * SCTP_BASE_SYSCTL(sctp_chunkscale)));
5765
5766         SCTP_ZONE_INIT(SCTP_BASE_INFO(ipi_zone_readq), "sctp_readq",
5767             sizeof(struct sctp_queued_to_read),
5768             (sctp_max_number_of_assoc * SCTP_BASE_SYSCTL(sctp_chunkscale)));
5769
5770         SCTP_ZONE_INIT(SCTP_BASE_INFO(ipi_zone_strmoq), "sctp_stream_msg_out",
5771             sizeof(struct sctp_stream_queue_pending),
5772             (sctp_max_number_of_assoc * SCTP_BASE_SYSCTL(sctp_chunkscale)));
5773
5774         SCTP_ZONE_INIT(SCTP_BASE_INFO(ipi_zone_asconf), "sctp_asconf",
5775             sizeof(struct sctp_asconf),
5776             (sctp_max_number_of_assoc * SCTP_BASE_SYSCTL(sctp_chunkscale)));
5777
5778         SCTP_ZONE_INIT(SCTP_BASE_INFO(ipi_zone_asconf_ack), "sctp_asconf_ack",
5779             sizeof(struct sctp_asconf_ack),
5780             (sctp_max_number_of_assoc * SCTP_BASE_SYSCTL(sctp_chunkscale)));
5781
5782         /* Master Lock INIT for info structure */
5783         SCTP_INP_INFO_LOCK_INIT();
5784         SCTP_STATLOG_INIT_LOCK();
5785
5786         SCTP_IPI_COUNT_INIT();
5787         SCTP_IPI_ADDR_INIT();
5788 #ifdef SCTP_PACKET_LOGGING
5789         SCTP_IP_PKTLOG_INIT();
5790 #endif
5791         LIST_INIT(&SCTP_BASE_INFO(addr_wq));
5792
5793         SCTP_WQ_ADDR_INIT();
5794         /* not sure if we need all the counts */
5795         SCTP_BASE_INFO(ipi_count_ep) = 0;
5796         /* assoc/tcb zone info */
5797         SCTP_BASE_INFO(ipi_count_asoc) = 0;
5798         /* local addrlist zone info */
5799         SCTP_BASE_INFO(ipi_count_laddr) = 0;
5800         /* remote addrlist zone info */
5801         SCTP_BASE_INFO(ipi_count_raddr) = 0;
5802         /* chunk info */
5803         SCTP_BASE_INFO(ipi_count_chunk) = 0;
5804
5805         /* socket queue zone info */
5806         SCTP_BASE_INFO(ipi_count_readq) = 0;
5807
5808         /* stream out queue cont */
5809         SCTP_BASE_INFO(ipi_count_strmoq) = 0;
5810
5811         SCTP_BASE_INFO(ipi_free_strmoq) = 0;
5812         SCTP_BASE_INFO(ipi_free_chunks) = 0;
5813
5814         SCTP_OS_TIMER_INIT(&SCTP_BASE_INFO(addr_wq_timer.timer));
5815
5816         /* Init the TIMEWAIT list */
5817         for (i = 0; i < SCTP_STACK_VTAG_HASH_SIZE; i++) {
5818                 LIST_INIT(&SCTP_BASE_INFO(vtag_timewait)[i]);
5819         }
5820         sctp_startup_iterator();
5821
5822 #if defined(SCTP_MCORE_INPUT) && defined(SMP)
5823         sctp_startup_mcore_threads();
5824 #endif
5825
5826         /*
5827          * INIT the default VRF which for BSD is the only one, other O/S's
5828          * may have more. But initially they must start with one and then
5829          * add the VRF's as addresses are added.
5830          */
5831         sctp_init_vrf_list(SCTP_DEFAULT_VRF);
5832 }
5833
5834 /*
5835  * Assumes that the SCTP_BASE_INFO() lock is NOT held.
5836  */
5837 void
5838 sctp_pcb_finish(void)
5839 {
5840         struct sctp_vrflist *vrf_bucket;
5841         struct sctp_vrf *vrf, *nvrf;
5842         struct sctp_ifn *ifn, *nifn;
5843         struct sctp_ifa *ifa, *nifa;
5844         struct sctpvtaghead *chain;
5845         struct sctp_tagblock *twait_block, *prev_twait_block;
5846         struct sctp_laddr *wi, *nwi;
5847         int i;
5848         struct sctp_iterator *it, *nit;
5849
5850         if (SCTP_BASE_VAR(sctp_pcb_initialized) == 0) {
5851                 SCTP_PRINTF("%s: race condition on teardown.\n", __func__);
5852                 return;
5853         }
5854         SCTP_BASE_VAR(sctp_pcb_initialized) = 0;
5855         /*
5856          * In FreeBSD the iterator thread never exits but we do clean up.
5857          * The only way FreeBSD reaches here is if we have VRF's but we
5858          * still add the ifdef to make it compile on old versions.
5859          */
5860 retry:
5861         SCTP_IPI_ITERATOR_WQ_LOCK();
5862         /*
5863          * sctp_iterator_worker() might be working on an it entry without
5864          * holding the lock.  We won't find it on the list either and
5865          * continue and free/destroy it.  While holding the lock, spin, to
5866          * avoid the race condition as sctp_iterator_worker() will have to
5867          * wait to re-acquire the lock.
5868          */
5869         if (sctp_it_ctl.iterator_running != 0 || sctp_it_ctl.cur_it != NULL) {
5870                 SCTP_IPI_ITERATOR_WQ_UNLOCK();
5871                 SCTP_PRINTF("%s: Iterator running while we held the lock. Retry. "
5872                     "cur_it=%p\n", __func__, sctp_it_ctl.cur_it);
5873                 DELAY(10);
5874                 goto retry;
5875         }
5876         TAILQ_FOREACH_SAFE(it, &sctp_it_ctl.iteratorhead, sctp_nxt_itr, nit) {
5877                 if (it->vn != curvnet) {
5878                         continue;
5879                 }
5880                 TAILQ_REMOVE(&sctp_it_ctl.iteratorhead, it, sctp_nxt_itr);
5881                 if (it->function_atend != NULL) {
5882                         (*it->function_atend) (it->pointer, it->val);
5883                 }
5884                 SCTP_FREE(it, SCTP_M_ITER);
5885         }
5886         SCTP_IPI_ITERATOR_WQ_UNLOCK();
5887         SCTP_ITERATOR_LOCK();
5888         if ((sctp_it_ctl.cur_it) &&
5889             (sctp_it_ctl.cur_it->vn == curvnet)) {
5890                 sctp_it_ctl.iterator_flags |= SCTP_ITERATOR_STOP_CUR_IT;
5891         }
5892         SCTP_ITERATOR_UNLOCK();
5893         SCTP_OS_TIMER_STOP_DRAIN(&SCTP_BASE_INFO(addr_wq_timer.timer));
5894         SCTP_WQ_ADDR_LOCK();
5895         LIST_FOREACH_SAFE(wi, &SCTP_BASE_INFO(addr_wq), sctp_nxt_addr, nwi) {
5896                 LIST_REMOVE(wi, sctp_nxt_addr);
5897                 SCTP_DECR_LADDR_COUNT();
5898                 if (wi->action == SCTP_DEL_IP_ADDRESS) {
5899                         SCTP_FREE(wi->ifa, SCTP_M_IFA);
5900                 }
5901                 SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_laddr), wi);
5902         }
5903         SCTP_WQ_ADDR_UNLOCK();
5904
5905         /*
5906          * free the vrf/ifn/ifa lists and hashes (be sure address monitor is
5907          * destroyed first).
5908          */
5909         SCTP_IPI_ADDR_WLOCK();
5910         vrf_bucket = &SCTP_BASE_INFO(sctp_vrfhash)[(SCTP_DEFAULT_VRFID & SCTP_BASE_INFO(hashvrfmark))];
5911         LIST_FOREACH_SAFE(vrf, vrf_bucket, next_vrf, nvrf) {
5912                 LIST_FOREACH_SAFE(ifn, &vrf->ifnlist, next_ifn, nifn) {
5913                         LIST_FOREACH_SAFE(ifa, &ifn->ifalist, next_ifa, nifa) {
5914                                 /* free the ifa */
5915                                 LIST_REMOVE(ifa, next_bucket);
5916                                 LIST_REMOVE(ifa, next_ifa);
5917                                 SCTP_FREE(ifa, SCTP_M_IFA);
5918                         }
5919                         /* free the ifn */
5920                         LIST_REMOVE(ifn, next_bucket);
5921                         LIST_REMOVE(ifn, next_ifn);
5922                         SCTP_FREE(ifn, SCTP_M_IFN);
5923                 }
5924                 SCTP_HASH_FREE(vrf->vrf_addr_hash, vrf->vrf_addr_hashmark);
5925                 /* free the vrf */
5926                 LIST_REMOVE(vrf, next_vrf);
5927                 SCTP_FREE(vrf, SCTP_M_VRF);
5928         }
5929         SCTP_IPI_ADDR_WUNLOCK();
5930         /* free the vrf hashes */
5931         SCTP_HASH_FREE(SCTP_BASE_INFO(sctp_vrfhash), SCTP_BASE_INFO(hashvrfmark));
5932         SCTP_HASH_FREE(SCTP_BASE_INFO(vrf_ifn_hash), SCTP_BASE_INFO(vrf_ifn_hashmark));
5933
5934         /*
5935          * free the TIMEWAIT list elements malloc'd in the function
5936          * sctp_add_vtag_to_timewait()...
5937          */
5938         for (i = 0; i < SCTP_STACK_VTAG_HASH_SIZE; i++) {
5939                 chain = &SCTP_BASE_INFO(vtag_timewait)[i];
5940                 if (!LIST_EMPTY(chain)) {
5941                         prev_twait_block = NULL;
5942                         LIST_FOREACH(twait_block, chain, sctp_nxt_tagblock) {
5943                                 if (prev_twait_block) {
5944                                         SCTP_FREE(prev_twait_block, SCTP_M_TIMW);
5945                                 }
5946                                 prev_twait_block = twait_block;
5947                         }
5948                         SCTP_FREE(prev_twait_block, SCTP_M_TIMW);
5949                 }
5950         }
5951
5952         /* free the locks and mutexes */
5953 #ifdef SCTP_PACKET_LOGGING
5954         SCTP_IP_PKTLOG_DESTROY();
5955 #endif
5956         SCTP_IPI_ADDR_DESTROY();
5957         SCTP_STATLOG_DESTROY();
5958         SCTP_INP_INFO_LOCK_DESTROY();
5959
5960         SCTP_WQ_ADDR_DESTROY();
5961
5962         /* Get rid of other stuff too. */
5963         if (SCTP_BASE_INFO(sctp_asochash) != NULL)
5964                 SCTP_HASH_FREE(SCTP_BASE_INFO(sctp_asochash), SCTP_BASE_INFO(hashasocmark));
5965         if (SCTP_BASE_INFO(sctp_ephash) != NULL)
5966                 SCTP_HASH_FREE(SCTP_BASE_INFO(sctp_ephash), SCTP_BASE_INFO(hashmark));
5967         if (SCTP_BASE_INFO(sctp_tcpephash) != NULL)
5968                 SCTP_HASH_FREE(SCTP_BASE_INFO(sctp_tcpephash), SCTP_BASE_INFO(hashtcpmark));
5969
5970         SCTP_ZONE_DESTROY(SCTP_BASE_INFO(ipi_zone_ep));
5971         SCTP_ZONE_DESTROY(SCTP_BASE_INFO(ipi_zone_asoc));
5972         SCTP_ZONE_DESTROY(SCTP_BASE_INFO(ipi_zone_laddr));
5973         SCTP_ZONE_DESTROY(SCTP_BASE_INFO(ipi_zone_net));
5974         SCTP_ZONE_DESTROY(SCTP_BASE_INFO(ipi_zone_chunk));
5975         SCTP_ZONE_DESTROY(SCTP_BASE_INFO(ipi_zone_readq));
5976         SCTP_ZONE_DESTROY(SCTP_BASE_INFO(ipi_zone_strmoq));
5977         SCTP_ZONE_DESTROY(SCTP_BASE_INFO(ipi_zone_asconf));
5978         SCTP_ZONE_DESTROY(SCTP_BASE_INFO(ipi_zone_asconf_ack));
5979 #if defined(SMP) && defined(SCTP_USE_PERCPU_STAT)
5980         SCTP_FREE(SCTP_BASE_STATS, SCTP_M_MCORE);
5981 #endif
5982 }
5983
5984 int
5985 sctp_load_addresses_from_init(struct sctp_tcb *stcb, struct mbuf *m,
5986     int offset, int limit,
5987     struct sockaddr *src, struct sockaddr *dst,
5988     struct sockaddr *altsa, uint16_t port)
5989 {
5990         /*
5991          * grub through the INIT pulling addresses and loading them to the
5992          * nets structure in the asoc. The from address in the mbuf should
5993          * also be loaded (if it is not already). This routine can be called
5994          * with either INIT or INIT-ACK's as long as the m points to the IP
5995          * packet and the offset points to the beginning of the parameters.
5996          */
5997         struct sctp_inpcb *inp;
5998         struct sctp_nets *net, *nnet, *net_tmp;
5999         struct sctp_paramhdr *phdr, param_buf;
6000         struct sctp_tcb *stcb_tmp;
6001         uint16_t ptype, plen;
6002         struct sockaddr *sa;
6003         uint8_t random_store[SCTP_PARAM_BUFFER_SIZE];
6004         struct sctp_auth_random *p_random = NULL;
6005         uint16_t random_len = 0;
6006         uint8_t hmacs_store[SCTP_PARAM_BUFFER_SIZE];
6007         struct sctp_auth_hmac_algo *hmacs = NULL;
6008         uint16_t hmacs_len = 0;
6009         uint8_t saw_asconf = 0;
6010         uint8_t saw_asconf_ack = 0;
6011         uint8_t chunks_store[SCTP_PARAM_BUFFER_SIZE];
6012         struct sctp_auth_chunk_list *chunks = NULL;
6013         uint16_t num_chunks = 0;
6014         sctp_key_t *new_key;
6015         uint32_t keylen;
6016         int got_random = 0, got_hmacs = 0, got_chklist = 0;
6017         uint8_t peer_supports_ecn;
6018         uint8_t peer_supports_prsctp;
6019         uint8_t peer_supports_auth;
6020         uint8_t peer_supports_asconf;
6021         uint8_t peer_supports_asconf_ack;
6022         uint8_t peer_supports_reconfig;
6023         uint8_t peer_supports_nrsack;
6024         uint8_t peer_supports_pktdrop;
6025         uint8_t peer_supports_idata;
6026 #ifdef INET
6027         struct sockaddr_in sin;
6028 #endif
6029 #ifdef INET6
6030         struct sockaddr_in6 sin6;
6031 #endif
6032
6033         /* First get the destination address setup too. */
6034 #ifdef INET
6035         memset(&sin, 0, sizeof(sin));
6036         sin.sin_family = AF_INET;
6037         sin.sin_len = sizeof(sin);
6038         sin.sin_port = stcb->rport;
6039 #endif
6040 #ifdef INET6
6041         memset(&sin6, 0, sizeof(sin6));
6042         sin6.sin6_family = AF_INET6;
6043         sin6.sin6_len = sizeof(struct sockaddr_in6);
6044         sin6.sin6_port = stcb->rport;
6045 #endif
6046         if (altsa) {
6047                 sa = altsa;
6048         } else {
6049                 sa = src;
6050         }
6051         peer_supports_idata = 0;
6052         peer_supports_ecn = 0;
6053         peer_supports_prsctp = 0;
6054         peer_supports_auth = 0;
6055         peer_supports_asconf = 0;
6056         peer_supports_asconf_ack = 0;
6057         peer_supports_reconfig = 0;
6058         peer_supports_nrsack = 0;
6059         peer_supports_pktdrop = 0;
6060         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
6061                 /* mark all addresses that we have currently on the list */
6062                 net->dest_state |= SCTP_ADDR_NOT_IN_ASSOC;
6063         }
6064         /* does the source address already exist? if so skip it */
6065         inp = stcb->sctp_ep;
6066         atomic_add_int(&stcb->asoc.refcnt, 1);
6067         stcb_tmp = sctp_findassociation_ep_addr(&inp, sa, &net_tmp, dst, stcb);
6068         atomic_add_int(&stcb->asoc.refcnt, -1);
6069
6070         if ((stcb_tmp == NULL && inp == stcb->sctp_ep) || inp == NULL) {
6071                 /* we must add the source address */
6072                 /* no scope set here since we have a tcb already. */
6073                 switch (sa->sa_family) {
6074 #ifdef INET
6075                 case AF_INET:
6076                         if (stcb->asoc.scope.ipv4_addr_legal) {
6077                                 if (sctp_add_remote_addr(stcb, sa, NULL, port, SCTP_DONOT_SETSCOPE, SCTP_LOAD_ADDR_2)) {
6078                                         return (-1);
6079                                 }
6080                         }
6081                         break;
6082 #endif
6083 #ifdef INET6
6084                 case AF_INET6:
6085                         if (stcb->asoc.scope.ipv6_addr_legal) {
6086                                 if (sctp_add_remote_addr(stcb, sa, NULL, port, SCTP_DONOT_SETSCOPE, SCTP_LOAD_ADDR_3)) {
6087                                         return (-2);
6088                                 }
6089                         }
6090                         break;
6091 #endif
6092                 default:
6093                         break;
6094                 }
6095         } else {
6096                 if (net_tmp != NULL && stcb_tmp == stcb) {
6097                         net_tmp->dest_state &= ~SCTP_ADDR_NOT_IN_ASSOC;
6098                 } else if (stcb_tmp != stcb) {
6099                         /* It belongs to another association? */
6100                         if (stcb_tmp)
6101                                 SCTP_TCB_UNLOCK(stcb_tmp);
6102                         return (-3);
6103                 }
6104         }
6105         if (stcb->asoc.state == 0) {
6106                 /* the assoc was freed? */
6107                 return (-4);
6108         }
6109         /* now we must go through each of the params. */
6110         phdr = sctp_get_next_param(m, offset, &param_buf, sizeof(param_buf));
6111         while (phdr) {
6112                 ptype = ntohs(phdr->param_type);
6113                 plen = ntohs(phdr->param_length);
6114                 /*
6115                  * SCTP_PRINTF("ptype => %0x, plen => %d\n",
6116                  * (uint32_t)ptype, (int)plen);
6117                  */
6118                 if (offset + plen > limit) {
6119                         break;
6120                 }
6121                 if (plen < sizeof(struct sctp_paramhdr)) {
6122                         break;
6123                 }
6124 #ifdef INET
6125                 if (ptype == SCTP_IPV4_ADDRESS) {
6126                         if (stcb->asoc.scope.ipv4_addr_legal) {
6127                                 struct sctp_ipv4addr_param *p4, p4_buf;
6128
6129                                 /* ok get the v4 address and check/add */
6130                                 phdr = sctp_get_next_param(m, offset,
6131                                     (struct sctp_paramhdr *)&p4_buf,
6132                                     sizeof(p4_buf));
6133                                 if (plen != sizeof(struct sctp_ipv4addr_param) ||
6134                                     phdr == NULL) {
6135                                         return (-5);
6136                                 }
6137                                 p4 = (struct sctp_ipv4addr_param *)phdr;
6138                                 sin.sin_addr.s_addr = p4->addr;
6139                                 if (IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
6140                                         /* Skip multi-cast addresses */
6141                                         goto next_param;
6142                                 }
6143                                 if ((sin.sin_addr.s_addr == INADDR_BROADCAST) ||
6144                                     (sin.sin_addr.s_addr == INADDR_ANY)) {
6145                                         goto next_param;
6146                                 }
6147                                 sa = (struct sockaddr *)&sin;
6148                                 inp = stcb->sctp_ep;
6149                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6150                                 stcb_tmp = sctp_findassociation_ep_addr(&inp, sa, &net,
6151                                     dst, stcb);
6152                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6153
6154                                 if ((stcb_tmp == NULL && inp == stcb->sctp_ep) ||
6155                                     inp == NULL) {
6156                                         /* we must add the source address */
6157                                         /*
6158                                          * no scope set since we have a tcb
6159                                          * already
6160                                          */
6161
6162                                         /*
6163                                          * we must validate the state again
6164                                          * here
6165                                          */
6166                         add_it_now:
6167                                         if (stcb->asoc.state == 0) {
6168                                                 /* the assoc was freed? */
6169                                                 return (-7);
6170                                         }
6171                                         if (sctp_add_remote_addr(stcb, sa, NULL, port, SCTP_DONOT_SETSCOPE, SCTP_LOAD_ADDR_4)) {
6172                                                 return (-8);
6173                                         }
6174                                 } else if (stcb_tmp == stcb) {
6175                                         if (stcb->asoc.state == 0) {
6176                                                 /* the assoc was freed? */
6177                                                 return (-10);
6178                                         }
6179                                         if (net != NULL) {
6180                                                 /* clear flag */
6181                                                 net->dest_state &=
6182                                                     ~SCTP_ADDR_NOT_IN_ASSOC;
6183                                         }
6184                                 } else {
6185                                         /*
6186                                          * strange, address is in another
6187                                          * assoc? straighten out locks.
6188                                          */
6189                                         if (stcb_tmp) {
6190                                                 if (SCTP_GET_STATE(stcb_tmp) == SCTP_STATE_COOKIE_WAIT) {
6191                                                         struct mbuf *op_err;
6192                                                         char msg[SCTP_DIAG_INFO_LEN];
6193
6194                                                         /*
6195                                                          * in setup state we
6196                                                          * abort this guy
6197                                                          */
6198                                                         SCTP_SNPRINTF(msg, sizeof(msg),
6199                                                             "%s:%d at %s", __FILE__, __LINE__, __func__);
6200                                                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
6201                                                             msg);
6202                                                         sctp_abort_an_association(stcb_tmp->sctp_ep,
6203                                                             stcb_tmp, op_err, false,
6204                                                             SCTP_SO_NOT_LOCKED);
6205                                                         goto add_it_now;
6206                                                 }
6207                                                 SCTP_TCB_UNLOCK(stcb_tmp);
6208                                         }
6209
6210                                         if (stcb->asoc.state == 0) {
6211                                                 /* the assoc was freed? */
6212                                                 return (-12);
6213                                         }
6214                                         return (-13);
6215                                 }
6216                         }
6217                 } else
6218 #endif
6219 #ifdef INET6
6220                 if (ptype == SCTP_IPV6_ADDRESS) {
6221                         if (stcb->asoc.scope.ipv6_addr_legal) {
6222                                 /* ok get the v6 address and check/add */
6223                                 struct sctp_ipv6addr_param *p6, p6_buf;
6224
6225                                 phdr = sctp_get_next_param(m, offset,
6226                                     (struct sctp_paramhdr *)&p6_buf,
6227                                     sizeof(p6_buf));
6228                                 if (plen != sizeof(struct sctp_ipv6addr_param) ||
6229                                     phdr == NULL) {
6230                                         return (-14);
6231                                 }
6232                                 p6 = (struct sctp_ipv6addr_param *)phdr;
6233                                 memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
6234                                     sizeof(p6->addr));
6235                                 if (IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
6236                                         /* Skip multi-cast addresses */
6237                                         goto next_param;
6238                                 }
6239                                 if (IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
6240                                         /*
6241                                          * Link local make no sense without
6242                                          * scope
6243                                          */
6244                                         goto next_param;
6245                                 }
6246                                 sa = (struct sockaddr *)&sin6;
6247                                 inp = stcb->sctp_ep;
6248                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6249                                 stcb_tmp = sctp_findassociation_ep_addr(&inp, sa, &net,
6250                                     dst, stcb);
6251                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6252                                 if (stcb_tmp == NULL &&
6253                                     (inp == stcb->sctp_ep || inp == NULL)) {
6254                                         /*
6255                                          * we must validate the state again
6256                                          * here
6257                                          */
6258                         add_it_now6:
6259                                         if (stcb->asoc.state == 0) {
6260                                                 /* the assoc was freed? */
6261                                                 return (-16);
6262                                         }
6263                                         /*
6264                                          * we must add the address, no scope
6265                                          * set
6266                                          */
6267                                         if (sctp_add_remote_addr(stcb, sa, NULL, port, SCTP_DONOT_SETSCOPE, SCTP_LOAD_ADDR_5)) {
6268                                                 return (-17);
6269                                         }
6270                                 } else if (stcb_tmp == stcb) {
6271                                         /*
6272                                          * we must validate the state again
6273                                          * here
6274                                          */
6275                                         if (stcb->asoc.state == 0) {
6276                                                 /* the assoc was freed? */
6277                                                 return (-19);
6278                                         }
6279                                         if (net != NULL) {
6280                                                 /* clear flag */
6281                                                 net->dest_state &=
6282                                                     ~SCTP_ADDR_NOT_IN_ASSOC;
6283                                         }
6284                                 } else {
6285                                         /*
6286                                          * strange, address is in another
6287                                          * assoc? straighten out locks.
6288                                          */
6289                                         if (stcb_tmp) {
6290                                                 if (SCTP_GET_STATE(stcb_tmp) == SCTP_STATE_COOKIE_WAIT) {
6291                                                         struct mbuf *op_err;
6292                                                         char msg[SCTP_DIAG_INFO_LEN];
6293
6294                                                         /*
6295                                                          * in setup state we
6296                                                          * abort this guy
6297                                                          */
6298                                                         SCTP_SNPRINTF(msg, sizeof(msg),
6299                                                             "%s:%d at %s", __FILE__, __LINE__, __func__);
6300                                                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
6301                                                             msg);
6302                                                         sctp_abort_an_association(stcb_tmp->sctp_ep,
6303                                                             stcb_tmp, op_err, false,
6304                                                             SCTP_SO_NOT_LOCKED);
6305                                                         goto add_it_now6;
6306                                                 }
6307                                                 SCTP_TCB_UNLOCK(stcb_tmp);
6308                                         }
6309                                         if (stcb->asoc.state == 0) {
6310                                                 /* the assoc was freed? */
6311                                                 return (-21);
6312                                         }
6313                                         return (-22);
6314                                 }
6315                         }
6316                 } else
6317 #endif
6318                 if (ptype == SCTP_ECN_CAPABLE) {
6319                         peer_supports_ecn = 1;
6320                 } else if (ptype == SCTP_ULP_ADAPTATION) {
6321                         if (stcb->asoc.state != SCTP_STATE_OPEN) {
6322                                 struct sctp_adaptation_layer_indication ai,
6323                                                                 *aip;
6324
6325                                 phdr = sctp_get_next_param(m, offset,
6326                                     (struct sctp_paramhdr *)&ai, sizeof(ai));
6327                                 aip = (struct sctp_adaptation_layer_indication *)phdr;
6328                                 if (aip) {
6329                                         stcb->asoc.peers_adaptation = ntohl(aip->indication);
6330                                         stcb->asoc.adaptation_needed = 1;
6331                                 }
6332                         }
6333                 } else if (ptype == SCTP_SET_PRIM_ADDR) {
6334                         struct sctp_asconf_addr_param lstore, *fee;
6335                         int lptype;
6336                         struct sockaddr *lsa = NULL;
6337 #ifdef INET
6338                         struct sctp_asconf_addrv4_param *fii;
6339 #endif
6340
6341                         if (stcb->asoc.asconf_supported == 0) {
6342                                 return (-100);
6343                         }
6344                         if (plen > sizeof(lstore)) {
6345                                 return (-23);
6346                         }
6347                         if (plen < sizeof(struct sctp_asconf_addrv4_param)) {
6348                                 return (-101);
6349                         }
6350                         phdr = sctp_get_next_param(m, offset,
6351                             (struct sctp_paramhdr *)&lstore,
6352                             plen);
6353                         if (phdr == NULL) {
6354                                 return (-24);
6355                         }
6356                         fee = (struct sctp_asconf_addr_param *)phdr;
6357                         lptype = ntohs(fee->addrp.ph.param_type);
6358                         switch (lptype) {
6359 #ifdef INET
6360                         case SCTP_IPV4_ADDRESS:
6361                                 if (plen !=
6362                                     sizeof(struct sctp_asconf_addrv4_param)) {
6363                                         SCTP_PRINTF("Sizeof setprim in init/init ack not %d but %d - ignored\n",
6364                                             (int)sizeof(struct sctp_asconf_addrv4_param),
6365                                             plen);
6366                                 } else {
6367                                         fii = (struct sctp_asconf_addrv4_param *)fee;
6368                                         sin.sin_addr.s_addr = fii->addrp.addr;
6369                                         lsa = (struct sockaddr *)&sin;
6370                                 }
6371                                 break;
6372 #endif
6373 #ifdef INET6
6374                         case SCTP_IPV6_ADDRESS:
6375                                 if (plen !=
6376                                     sizeof(struct sctp_asconf_addr_param)) {
6377                                         SCTP_PRINTF("Sizeof setprim (v6) in init/init ack not %d but %d - ignored\n",
6378                                             (int)sizeof(struct sctp_asconf_addr_param),
6379                                             plen);
6380                                 } else {
6381                                         memcpy(sin6.sin6_addr.s6_addr,
6382                                             fee->addrp.addr,
6383                                             sizeof(fee->addrp.addr));
6384                                         lsa = (struct sockaddr *)&sin6;
6385                                 }
6386                                 break;
6387 #endif
6388                         default:
6389                                 break;
6390                         }
6391                         if (lsa) {
6392                                 (void)sctp_set_primary_addr(stcb, sa, NULL);
6393                         }
6394                 } else if (ptype == SCTP_HAS_NAT_SUPPORT) {
6395                         stcb->asoc.peer_supports_nat = 1;
6396                 } else if (ptype == SCTP_PRSCTP_SUPPORTED) {
6397                         /* Peer supports pr-sctp */
6398                         peer_supports_prsctp = 1;
6399                 } else if (ptype == SCTP_SUPPORTED_CHUNK_EXT) {
6400                         /* A supported extension chunk */
6401                         struct sctp_supported_chunk_types_param *pr_supported;
6402                         uint8_t local_store[SCTP_PARAM_BUFFER_SIZE];
6403                         int num_ent, i;
6404
6405                         if (plen > sizeof(local_store)) {
6406                                 return (-35);
6407                         }
6408                         phdr = sctp_get_next_param(m, offset,
6409                             (struct sctp_paramhdr *)&local_store, plen);
6410                         if (phdr == NULL) {
6411                                 return (-25);
6412                         }
6413                         pr_supported = (struct sctp_supported_chunk_types_param *)phdr;
6414                         num_ent = plen - sizeof(struct sctp_paramhdr);
6415                         for (i = 0; i < num_ent; i++) {
6416                                 switch (pr_supported->chunk_types[i]) {
6417                                 case SCTP_ASCONF:
6418                                         peer_supports_asconf = 1;
6419                                         break;
6420                                 case SCTP_ASCONF_ACK:
6421                                         peer_supports_asconf_ack = 1;
6422                                         break;
6423                                 case SCTP_FORWARD_CUM_TSN:
6424                                         peer_supports_prsctp = 1;
6425                                         break;
6426                                 case SCTP_PACKET_DROPPED:
6427                                         peer_supports_pktdrop = 1;
6428                                         break;
6429                                 case SCTP_NR_SELECTIVE_ACK:
6430                                         peer_supports_nrsack = 1;
6431                                         break;
6432                                 case SCTP_STREAM_RESET:
6433                                         peer_supports_reconfig = 1;
6434                                         break;
6435                                 case SCTP_AUTHENTICATION:
6436                                         peer_supports_auth = 1;
6437                                         break;
6438                                 case SCTP_IDATA:
6439                                         peer_supports_idata = 1;
6440                                         break;
6441                                 default:
6442                                         /* one I have not learned yet */
6443                                         break;
6444                                 }
6445                         }
6446                 } else if (ptype == SCTP_RANDOM) {
6447                         if (plen > sizeof(random_store))
6448                                 break;
6449                         if (got_random) {
6450                                 /* already processed a RANDOM */
6451                                 goto next_param;
6452                         }
6453                         phdr = sctp_get_next_param(m, offset,
6454                             (struct sctp_paramhdr *)random_store,
6455                             plen);
6456                         if (phdr == NULL)
6457                                 return (-26);
6458                         p_random = (struct sctp_auth_random *)phdr;
6459                         random_len = plen - sizeof(*p_random);
6460                         /* enforce the random length */
6461                         if (random_len != SCTP_AUTH_RANDOM_SIZE_REQUIRED) {
6462                                 SCTPDBG(SCTP_DEBUG_AUTH1, "SCTP: invalid RANDOM len\n");
6463                                 return (-27);
6464                         }
6465                         got_random = 1;
6466                 } else if (ptype == SCTP_HMAC_LIST) {
6467                         uint16_t num_hmacs;
6468                         uint16_t i;
6469
6470                         if (plen > sizeof(hmacs_store))
6471                                 break;
6472                         if (got_hmacs) {
6473                                 /* already processed a HMAC list */
6474                                 goto next_param;
6475                         }
6476                         phdr = sctp_get_next_param(m, offset,
6477                             (struct sctp_paramhdr *)hmacs_store,
6478                             plen);
6479                         if (phdr == NULL)
6480                                 return (-28);
6481                         hmacs = (struct sctp_auth_hmac_algo *)phdr;
6482                         hmacs_len = plen - sizeof(*hmacs);
6483                         num_hmacs = hmacs_len / sizeof(hmacs->hmac_ids[0]);
6484                         /* validate the hmac list */
6485                         if (sctp_verify_hmac_param(hmacs, num_hmacs)) {
6486                                 return (-29);
6487                         }
6488                         if (stcb->asoc.peer_hmacs != NULL)
6489                                 sctp_free_hmaclist(stcb->asoc.peer_hmacs);
6490                         stcb->asoc.peer_hmacs = sctp_alloc_hmaclist(num_hmacs);
6491                         if (stcb->asoc.peer_hmacs != NULL) {
6492                                 for (i = 0; i < num_hmacs; i++) {
6493                                         (void)sctp_auth_add_hmacid(stcb->asoc.peer_hmacs,
6494                                             ntohs(hmacs->hmac_ids[i]));
6495                                 }
6496                         }
6497                         got_hmacs = 1;
6498                 } else if (ptype == SCTP_CHUNK_LIST) {
6499                         int i;
6500
6501                         if (plen > sizeof(chunks_store))
6502                                 break;
6503                         if (got_chklist) {
6504                                 /* already processed a Chunks list */
6505                                 goto next_param;
6506                         }
6507                         phdr = sctp_get_next_param(m, offset,
6508                             (struct sctp_paramhdr *)chunks_store,
6509                             plen);
6510                         if (phdr == NULL)
6511                                 return (-30);
6512                         chunks = (struct sctp_auth_chunk_list *)phdr;
6513                         num_chunks = plen - sizeof(*chunks);
6514                         if (stcb->asoc.peer_auth_chunks != NULL)
6515                                 sctp_clear_chunklist(stcb->asoc.peer_auth_chunks);
6516                         else
6517                                 stcb->asoc.peer_auth_chunks = sctp_alloc_chunklist();
6518                         for (i = 0; i < num_chunks; i++) {
6519                                 (void)sctp_auth_add_chunk(chunks->chunk_types[i],
6520                                     stcb->asoc.peer_auth_chunks);
6521                                 /* record asconf/asconf-ack if listed */
6522                                 if (chunks->chunk_types[i] == SCTP_ASCONF)
6523                                         saw_asconf = 1;
6524                                 if (chunks->chunk_types[i] == SCTP_ASCONF_ACK)
6525                                         saw_asconf_ack = 1;
6526                         }
6527                         got_chklist = 1;
6528                 } else if ((ptype == SCTP_HEARTBEAT_INFO) ||
6529                             (ptype == SCTP_STATE_COOKIE) ||
6530                             (ptype == SCTP_UNRECOG_PARAM) ||
6531                             (ptype == SCTP_COOKIE_PRESERVE) ||
6532                             (ptype == SCTP_SUPPORTED_ADDRTYPE) ||
6533                             (ptype == SCTP_ADD_IP_ADDRESS) ||
6534                             (ptype == SCTP_DEL_IP_ADDRESS) ||
6535                             (ptype == SCTP_ERROR_CAUSE_IND) ||
6536                     (ptype == SCTP_SUCCESS_REPORT)) {
6537                         /* don't care */
6538                 } else {
6539                         if ((ptype & 0x8000) == 0x0000) {
6540                                 /*
6541                                  * must stop processing the rest of the
6542                                  * param's. Any report bits were handled
6543                                  * with the call to
6544                                  * sctp_arethere_unrecognized_parameters()
6545                                  * when the INIT or INIT-ACK was first seen.
6546                                  */
6547                                 break;
6548                         }
6549                 }
6550
6551 next_param:
6552                 offset += SCTP_SIZE32(plen);
6553                 if (offset >= limit) {
6554                         break;
6555                 }
6556                 phdr = sctp_get_next_param(m, offset, &param_buf,
6557                     sizeof(param_buf));
6558         }
6559         /* Now check to see if we need to purge any addresses */
6560         TAILQ_FOREACH_SAFE(net, &stcb->asoc.nets, sctp_next, nnet) {
6561                 if ((net->dest_state & SCTP_ADDR_NOT_IN_ASSOC) ==
6562                     SCTP_ADDR_NOT_IN_ASSOC) {
6563                         /* This address has been removed from the asoc */
6564                         /* remove and free it */
6565                         stcb->asoc.numnets--;
6566                         TAILQ_REMOVE(&stcb->asoc.nets, net, sctp_next);
6567                         if (net == stcb->asoc.alternate) {
6568                                 sctp_free_remote_addr(stcb->asoc.alternate);
6569                                 stcb->asoc.alternate = NULL;
6570                         }
6571                         if (net == stcb->asoc.primary_destination) {
6572                                 stcb->asoc.primary_destination = NULL;
6573                                 sctp_select_primary_destination(stcb);
6574                         }
6575                         sctp_free_remote_addr(net);
6576                 }
6577         }
6578         if ((stcb->asoc.ecn_supported == 1) &&
6579             (peer_supports_ecn == 0)) {
6580                 stcb->asoc.ecn_supported = 0;
6581         }
6582         if ((stcb->asoc.prsctp_supported == 1) &&
6583             (peer_supports_prsctp == 0)) {
6584                 stcb->asoc.prsctp_supported = 0;
6585         }
6586         if ((stcb->asoc.auth_supported == 1) &&
6587             ((peer_supports_auth == 0) ||
6588             (got_random == 0) || (got_hmacs == 0))) {
6589                 stcb->asoc.auth_supported = 0;
6590         }
6591         if ((stcb->asoc.asconf_supported == 1) &&
6592             ((peer_supports_asconf == 0) || (peer_supports_asconf_ack == 0) ||
6593             (stcb->asoc.auth_supported == 0) ||
6594             (saw_asconf == 0) || (saw_asconf_ack == 0))) {
6595                 stcb->asoc.asconf_supported = 0;
6596         }
6597         if ((stcb->asoc.reconfig_supported == 1) &&
6598             (peer_supports_reconfig == 0)) {
6599                 stcb->asoc.reconfig_supported = 0;
6600         }
6601         if ((stcb->asoc.idata_supported == 1) &&
6602             (peer_supports_idata == 0)) {
6603                 stcb->asoc.idata_supported = 0;
6604         }
6605         if ((stcb->asoc.nrsack_supported == 1) &&
6606             (peer_supports_nrsack == 0)) {
6607                 stcb->asoc.nrsack_supported = 0;
6608         }
6609         if ((stcb->asoc.pktdrop_supported == 1) &&
6610             (peer_supports_pktdrop == 0)) {
6611                 stcb->asoc.pktdrop_supported = 0;
6612         }
6613         /* validate authentication required parameters */
6614         if ((peer_supports_auth == 0) && (got_chklist == 1)) {
6615                 /* peer does not support auth but sent a chunks list? */
6616                 return (-31);
6617         }
6618         if ((peer_supports_asconf == 1) && (peer_supports_auth == 0)) {
6619                 /* peer supports asconf but not auth? */
6620                 return (-32);
6621         } else if ((peer_supports_asconf == 1) &&
6622                     (peer_supports_auth == 1) &&
6623             ((saw_asconf == 0) || (saw_asconf_ack == 0))) {
6624                 return (-33);
6625         }
6626         /* concatenate the full random key */
6627         keylen = sizeof(*p_random) + random_len + sizeof(*hmacs) + hmacs_len;
6628         if (chunks != NULL) {
6629                 keylen += sizeof(*chunks) + num_chunks;
6630         }
6631         new_key = sctp_alloc_key(keylen);
6632         if (new_key != NULL) {
6633                 /* copy in the RANDOM */
6634                 if (p_random != NULL) {
6635                         keylen = sizeof(*p_random) + random_len;
6636                         memcpy(new_key->key, p_random, keylen);
6637                 } else {
6638                         keylen = 0;
6639                 }
6640                 /* append in the AUTH chunks */
6641                 if (chunks != NULL) {
6642                         memcpy(new_key->key + keylen, chunks,
6643                             sizeof(*chunks) + num_chunks);
6644                         keylen += sizeof(*chunks) + num_chunks;
6645                 }
6646                 /* append in the HMACs */
6647                 if (hmacs != NULL) {
6648                         memcpy(new_key->key + keylen, hmacs,
6649                             sizeof(*hmacs) + hmacs_len);
6650                 }
6651         } else {
6652                 /* failed to get memory for the key */
6653                 return (-34);
6654         }
6655         if (stcb->asoc.authinfo.peer_random != NULL)
6656                 sctp_free_key(stcb->asoc.authinfo.peer_random);
6657         stcb->asoc.authinfo.peer_random = new_key;
6658         sctp_clear_cachedkeys(stcb, stcb->asoc.authinfo.assoc_keyid);
6659         sctp_clear_cachedkeys(stcb, stcb->asoc.authinfo.recv_keyid);
6660
6661         return (0);
6662 }
6663
6664 int
6665 sctp_set_primary_addr(struct sctp_tcb *stcb, struct sockaddr *sa,
6666     struct sctp_nets *net)
6667 {
6668         /* make sure the requested primary address exists in the assoc */
6669         if (net == NULL && sa)
6670                 net = sctp_findnet(stcb, sa);
6671
6672         if (net == NULL) {
6673                 /* didn't find the requested primary address! */
6674                 return (-1);
6675         } else {
6676                 /* set the primary address */
6677                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
6678                         /* Must be confirmed, so queue to set */
6679                         net->dest_state |= SCTP_ADDR_REQ_PRIMARY;
6680                         return (0);
6681                 }
6682                 stcb->asoc.primary_destination = net;
6683                 if (!(net->dest_state & SCTP_ADDR_PF) && (stcb->asoc.alternate)) {
6684                         sctp_free_remote_addr(stcb->asoc.alternate);
6685                         stcb->asoc.alternate = NULL;
6686                 }
6687                 net = TAILQ_FIRST(&stcb->asoc.nets);
6688                 if (net != stcb->asoc.primary_destination) {
6689                         /*
6690                          * first one on the list is NOT the primary
6691                          * sctp_cmpaddr() is much more efficient if the
6692                          * primary is the first on the list, make it so.
6693                          */
6694                         TAILQ_REMOVE(&stcb->asoc.nets, stcb->asoc.primary_destination, sctp_next);
6695                         TAILQ_INSERT_HEAD(&stcb->asoc.nets, stcb->asoc.primary_destination, sctp_next);
6696                 }
6697                 return (0);
6698         }
6699 }
6700
6701 int
6702 sctp_is_vtag_good(uint32_t tag, uint16_t lport, uint16_t rport, struct timeval *now)
6703 {
6704         /*
6705          * This function serves two purposes. It will see if a TAG can be
6706          * re-used and return 1 for yes it is ok and 0 for don't use that
6707          * tag. A secondary function it will do is purge out old tags that
6708          * can be removed.
6709          */
6710         struct sctpvtaghead *chain;
6711         struct sctp_tagblock *twait_block;
6712         struct sctpasochead *head;
6713         struct sctp_tcb *stcb;
6714         int i;
6715
6716         SCTP_INP_INFO_RLOCK();
6717         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
6718             SCTP_BASE_INFO(hashasocmark))];
6719         LIST_FOREACH(stcb, head, sctp_asocs) {
6720                 /*
6721                  * We choose not to lock anything here. TCB's can't be
6722                  * removed since we have the read lock, so they can't be
6723                  * freed on us, same thing for the INP. I may be wrong with
6724                  * this assumption, but we will go with it for now :-)
6725                  */
6726                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) {
6727                         continue;
6728                 }
6729                 if (stcb->asoc.my_vtag == tag) {
6730                         /* candidate */
6731                         if (stcb->rport != rport) {
6732                                 continue;
6733                         }
6734                         if (stcb->sctp_ep->sctp_lport != lport) {
6735                                 continue;
6736                         }
6737                         /* Its a used tag set */
6738                         SCTP_INP_INFO_RUNLOCK();
6739                         return (0);
6740                 }
6741         }
6742         chain = &SCTP_BASE_INFO(vtag_timewait)[(tag % SCTP_STACK_VTAG_HASH_SIZE)];
6743         /* Now what about timed wait ? */
6744         LIST_FOREACH(twait_block, chain, sctp_nxt_tagblock) {
6745                 /*
6746                  * Block(s) are present, lets see if we have this tag in the
6747                  * list
6748                  */
6749                 for (i = 0; i < SCTP_NUMBER_IN_VTAG_BLOCK; i++) {
6750                         if (twait_block->vtag_block[i].v_tag == 0) {
6751                                 /* not used */
6752                                 continue;
6753                         } else if ((long)twait_block->vtag_block[i].tv_sec_at_expire <
6754                             now->tv_sec) {
6755                                 /* Audit expires this guy */
6756                                 twait_block->vtag_block[i].tv_sec_at_expire = 0;
6757                                 twait_block->vtag_block[i].v_tag = 0;
6758                                 twait_block->vtag_block[i].lport = 0;
6759                                 twait_block->vtag_block[i].rport = 0;
6760                         } else if ((twait_block->vtag_block[i].v_tag == tag) &&
6761                                     (twait_block->vtag_block[i].lport == lport) &&
6762                             (twait_block->vtag_block[i].rport == rport)) {
6763                                 /* Bad tag, sorry :< */
6764                                 SCTP_INP_INFO_RUNLOCK();
6765                                 return (0);
6766                         }
6767                 }
6768         }
6769         SCTP_INP_INFO_RUNLOCK();
6770         return (1);
6771 }
6772
6773 static void
6774 sctp_drain_mbufs(struct sctp_tcb *stcb)
6775 {
6776         /*
6777          * We must hunt this association for MBUF's past the cumack (i.e.
6778          * out of order data that we can renege on).
6779          */
6780         struct sctp_association *asoc;
6781         struct sctp_tmit_chunk *chk, *nchk;
6782         uint32_t cumulative_tsn_p1;
6783         struct sctp_queued_to_read *control, *ncontrol;
6784         int cnt, strmat;
6785         uint32_t gap, i;
6786         int fnd = 0;
6787
6788         /* We look for anything larger than the cum-ack + 1 */
6789
6790         asoc = &stcb->asoc;
6791         if (asoc->cumulative_tsn == asoc->highest_tsn_inside_map) {
6792                 /* none we can reneg on. */
6793                 return;
6794         }
6795         SCTP_STAT_INCR(sctps_protocol_drains_done);
6796         cumulative_tsn_p1 = asoc->cumulative_tsn + 1;
6797         cnt = 0;
6798         /* Ok that was fun, now we will drain all the inbound streams? */
6799         for (strmat = 0; strmat < asoc->streamincnt; strmat++) {
6800                 TAILQ_FOREACH_SAFE(control, &asoc->strmin[strmat].inqueue, next_instrm, ncontrol) {
6801 #ifdef INVARIANTS
6802                         if (control->on_strm_q != SCTP_ON_ORDERED) {
6803                                 panic("Huh control: %p on_q: %d -- not ordered?",
6804                                     control, control->on_strm_q);
6805                         }
6806 #endif
6807                         if (SCTP_TSN_GT(control->sinfo_tsn, cumulative_tsn_p1)) {
6808                                 /* Yep it is above cum-ack */
6809                                 cnt++;
6810                                 SCTP_CALC_TSN_TO_GAP(gap, control->sinfo_tsn, asoc->mapping_array_base_tsn);
6811                                 KASSERT(control->length > 0, ("control has zero length"));
6812                                 if (asoc->size_on_all_streams >= control->length) {
6813                                         asoc->size_on_all_streams -= control->length;
6814                                 } else {
6815 #ifdef INVARIANTS
6816                                         panic("size_on_all_streams = %u smaller than control length %u", asoc->size_on_all_streams, control->length);
6817 #else
6818                                         asoc->size_on_all_streams = 0;
6819 #endif
6820                                 }
6821                                 sctp_ucount_decr(asoc->cnt_on_all_streams);
6822                                 SCTP_UNSET_TSN_PRESENT(asoc->mapping_array, gap);
6823                                 if (control->on_read_q) {
6824                                         TAILQ_REMOVE(&stcb->sctp_ep->read_queue, control, next);
6825                                         control->on_read_q = 0;
6826                                 }
6827                                 TAILQ_REMOVE(&asoc->strmin[strmat].inqueue, control, next_instrm);
6828                                 control->on_strm_q = 0;
6829                                 if (control->data) {
6830                                         sctp_m_freem(control->data);
6831                                         control->data = NULL;
6832                                 }
6833                                 sctp_free_remote_addr(control->whoFrom);
6834                                 /* Now its reasm? */
6835                                 TAILQ_FOREACH_SAFE(chk, &control->reasm, sctp_next, nchk) {
6836                                         cnt++;
6837                                         SCTP_CALC_TSN_TO_GAP(gap, chk->rec.data.tsn, asoc->mapping_array_base_tsn);
6838                                         KASSERT(chk->send_size > 0, ("chunk has zero length"));
6839                                         if (asoc->size_on_reasm_queue >= chk->send_size) {
6840                                                 asoc->size_on_reasm_queue -= chk->send_size;
6841                                         } else {
6842 #ifdef INVARIANTS
6843                                                 panic("size_on_reasm_queue = %u smaller than chunk length %u", asoc->size_on_reasm_queue, chk->send_size);
6844 #else
6845                                                 asoc->size_on_reasm_queue = 0;
6846 #endif
6847                                         }
6848                                         sctp_ucount_decr(asoc->cnt_on_reasm_queue);
6849                                         SCTP_UNSET_TSN_PRESENT(asoc->mapping_array, gap);
6850                                         TAILQ_REMOVE(&control->reasm, chk, sctp_next);
6851                                         if (chk->data) {
6852                                                 sctp_m_freem(chk->data);
6853                                                 chk->data = NULL;
6854                                         }
6855                                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6856                                 }
6857                                 sctp_free_a_readq(stcb, control);
6858                         }
6859                 }
6860                 TAILQ_FOREACH_SAFE(control, &asoc->strmin[strmat].uno_inqueue, next_instrm, ncontrol) {
6861 #ifdef INVARIANTS
6862                         if (control->on_strm_q != SCTP_ON_UNORDERED) {
6863                                 panic("Huh control: %p on_q: %d -- not unordered?",
6864                                     control, control->on_strm_q);
6865                         }
6866 #endif
6867                         if (SCTP_TSN_GT(control->sinfo_tsn, cumulative_tsn_p1)) {
6868                                 /* Yep it is above cum-ack */
6869                                 cnt++;
6870                                 SCTP_CALC_TSN_TO_GAP(gap, control->sinfo_tsn, asoc->mapping_array_base_tsn);
6871                                 KASSERT(control->length > 0, ("control has zero length"));
6872                                 if (asoc->size_on_all_streams >= control->length) {
6873                                         asoc->size_on_all_streams -= control->length;
6874                                 } else {
6875 #ifdef INVARIANTS
6876                                         panic("size_on_all_streams = %u smaller than control length %u", asoc->size_on_all_streams, control->length);
6877 #else
6878                                         asoc->size_on_all_streams = 0;
6879 #endif
6880                                 }
6881                                 sctp_ucount_decr(asoc->cnt_on_all_streams);
6882                                 SCTP_UNSET_TSN_PRESENT(asoc->mapping_array, gap);
6883                                 if (control->on_read_q) {
6884                                         TAILQ_REMOVE(&stcb->sctp_ep->read_queue, control, next);
6885                                         control->on_read_q = 0;
6886                                 }
6887                                 TAILQ_REMOVE(&asoc->strmin[strmat].uno_inqueue, control, next_instrm);
6888                                 control->on_strm_q = 0;
6889                                 if (control->data) {
6890                                         sctp_m_freem(control->data);
6891                                         control->data = NULL;
6892                                 }
6893                                 sctp_free_remote_addr(control->whoFrom);
6894                                 /* Now its reasm? */
6895                                 TAILQ_FOREACH_SAFE(chk, &control->reasm, sctp_next, nchk) {
6896                                         cnt++;
6897                                         SCTP_CALC_TSN_TO_GAP(gap, chk->rec.data.tsn, asoc->mapping_array_base_tsn);
6898                                         KASSERT(chk->send_size > 0, ("chunk has zero length"));
6899                                         if (asoc->size_on_reasm_queue >= chk->send_size) {
6900                                                 asoc->size_on_reasm_queue -= chk->send_size;
6901                                         } else {
6902 #ifdef INVARIANTS
6903                                                 panic("size_on_reasm_queue = %u smaller than chunk length %u", asoc->size_on_reasm_queue, chk->send_size);
6904 #else
6905                                                 asoc->size_on_reasm_queue = 0;
6906 #endif
6907                                         }
6908                                         sctp_ucount_decr(asoc->cnt_on_reasm_queue);
6909                                         SCTP_UNSET_TSN_PRESENT(asoc->mapping_array, gap);
6910                                         TAILQ_REMOVE(&control->reasm, chk, sctp_next);
6911                                         if (chk->data) {
6912                                                 sctp_m_freem(chk->data);
6913                                                 chk->data = NULL;
6914                                         }
6915                                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6916                                 }
6917                                 sctp_free_a_readq(stcb, control);
6918                         }
6919                 }
6920         }
6921         if (cnt) {
6922                 /* We must back down to see what the new highest is */
6923                 for (i = asoc->highest_tsn_inside_map; SCTP_TSN_GE(i, asoc->mapping_array_base_tsn); i--) {
6924                         SCTP_CALC_TSN_TO_GAP(gap, i, asoc->mapping_array_base_tsn);
6925                         if (SCTP_IS_TSN_PRESENT(asoc->mapping_array, gap)) {
6926                                 asoc->highest_tsn_inside_map = i;
6927                                 fnd = 1;
6928                                 break;
6929                         }
6930                 }
6931                 if (!fnd) {
6932                         asoc->highest_tsn_inside_map = asoc->mapping_array_base_tsn - 1;
6933                 }
6934
6935                 /*
6936                  * Question, should we go through the delivery queue? The
6937                  * only reason things are on here is the app not reading OR
6938                  * a p-d-api up. An attacker COULD send enough in to
6939                  * initiate the PD-API and then send a bunch of stuff to
6940                  * other streams... these would wind up on the delivery
6941                  * queue.. and then we would not get to them. But in order
6942                  * to do this I then have to back-track and un-deliver
6943                  * sequence numbers in streams.. el-yucko. I think for now
6944                  * we will NOT look at the delivery queue and leave it to be
6945                  * something to consider later. An alternative would be to
6946                  * abort the P-D-API with a notification and then deliver
6947                  * the data.... Or another method might be to keep track of
6948                  * how many times the situation occurs and if we see a
6949                  * possible attack underway just abort the association.
6950                  */
6951 #ifdef SCTP_DEBUG
6952                 SCTPDBG(SCTP_DEBUG_PCB1, "Freed %d chunks from reneg harvest\n", cnt);
6953 #endif
6954                 /*
6955                  * Now do we need to find a new
6956                  * asoc->highest_tsn_inside_map?
6957                  */
6958                 asoc->last_revoke_count = cnt;
6959                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL,
6960                     SCTP_FROM_SCTP_PCB + SCTP_LOC_11);
6961                 /* sa_ignore NO_NULL_CHK */
6962                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
6963                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_DRAIN, SCTP_SO_NOT_LOCKED);
6964         }
6965         /*
6966          * Another issue, in un-setting the TSN's in the mapping array we
6967          * DID NOT adjust the highest_tsn marker.  This will cause one of
6968          * two things to occur. It may cause us to do extra work in checking
6969          * for our mapping array movement. More importantly it may cause us
6970          * to SACK every datagram. This may not be a bad thing though since
6971          * we will recover once we get our cum-ack above and all this stuff
6972          * we dumped recovered.
6973          */
6974 }
6975
6976 void
6977 sctp_drain()
6978 {
6979         /*
6980          * We must walk the PCB lists for ALL associations here. The system
6981          * is LOW on MBUF's and needs help. This is where reneging will
6982          * occur. We really hope this does NOT happen!
6983          */
6984         VNET_ITERATOR_DECL(vnet_iter);
6985         VNET_LIST_RLOCK_NOSLEEP();
6986         VNET_FOREACH(vnet_iter) {
6987                 CURVNET_SET(vnet_iter);
6988                 struct sctp_inpcb *inp;
6989                 struct sctp_tcb *stcb;
6990
6991                 SCTP_STAT_INCR(sctps_protocol_drain_calls);
6992                 if (SCTP_BASE_SYSCTL(sctp_do_drain) == 0) {
6993 #ifdef VIMAGE
6994                         continue;
6995 #else
6996                         return;
6997 #endif
6998                 }
6999                 SCTP_INP_INFO_RLOCK();
7000                 LIST_FOREACH(inp, &SCTP_BASE_INFO(listhead), sctp_list) {
7001                         /* For each endpoint */
7002                         SCTP_INP_RLOCK(inp);
7003                         LIST_FOREACH(stcb, &inp->sctp_asoc_list, sctp_tcblist) {
7004                                 /* For each association */
7005                                 SCTP_TCB_LOCK(stcb);
7006                                 sctp_drain_mbufs(stcb);
7007                                 SCTP_TCB_UNLOCK(stcb);
7008                         }
7009                         SCTP_INP_RUNLOCK(inp);
7010                 }
7011                 SCTP_INP_INFO_RUNLOCK();
7012                 CURVNET_RESTORE();
7013         }
7014         VNET_LIST_RUNLOCK_NOSLEEP();
7015 }
7016
7017 /*
7018  * start a new iterator
7019  * iterates through all endpoints and associations based on the pcb_state
7020  * flags and asoc_state.  "af" (mandatory) is executed for all matching
7021  * assocs and "ef" (optional) is executed when the iterator completes.
7022  * "inpf" (optional) is executed for each new endpoint as it is being
7023  * iterated through. inpe (optional) is called when the inp completes
7024  * its way through all the stcbs.
7025  */
7026 int
7027 sctp_initiate_iterator(inp_func inpf,
7028     asoc_func af,
7029     inp_func inpe,
7030     uint32_t pcb_state,
7031     uint32_t pcb_features,
7032     uint32_t asoc_state,
7033     void *argp,
7034     uint32_t argi,
7035     end_func ef,
7036     struct sctp_inpcb *s_inp,
7037     uint8_t chunk_output_off)
7038 {
7039         struct sctp_iterator *it = NULL;
7040
7041         if (af == NULL) {
7042                 return (-1);
7043         }
7044         if (SCTP_BASE_VAR(sctp_pcb_initialized) == 0) {
7045                 SCTP_PRINTF("%s: abort on initialize being %d\n", __func__,
7046                     SCTP_BASE_VAR(sctp_pcb_initialized));
7047                 return (-1);
7048         }
7049         SCTP_MALLOC(it, struct sctp_iterator *, sizeof(struct sctp_iterator),
7050             SCTP_M_ITER);
7051         if (it == NULL) {
7052                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_PCB, ENOMEM);
7053                 return (-1);
7054         }
7055         memset(it, 0, sizeof(*it));
7056         it->function_assoc = af;
7057         it->function_inp = inpf;
7058         if (inpf)
7059                 it->done_current_ep = 0;
7060         else
7061                 it->done_current_ep = 1;
7062         it->function_atend = ef;
7063         it->pointer = argp;
7064         it->val = argi;
7065         it->pcb_flags = pcb_state;
7066         it->pcb_features = pcb_features;
7067         it->asoc_state = asoc_state;
7068         it->function_inp_end = inpe;
7069         it->no_chunk_output = chunk_output_off;
7070         it->vn = curvnet;
7071         if (s_inp) {
7072                 /* Assume lock is held here */
7073                 it->inp = s_inp;
7074                 SCTP_INP_INCR_REF(it->inp);
7075                 it->iterator_flags = SCTP_ITERATOR_DO_SINGLE_INP;
7076         } else {
7077                 SCTP_INP_INFO_RLOCK();
7078                 it->inp = LIST_FIRST(&SCTP_BASE_INFO(listhead));
7079                 if (it->inp) {
7080                         SCTP_INP_INCR_REF(it->inp);
7081                 }
7082                 SCTP_INP_INFO_RUNLOCK();
7083                 it->iterator_flags = SCTP_ITERATOR_DO_ALL_INP;
7084         }
7085         SCTP_IPI_ITERATOR_WQ_LOCK();
7086         if (SCTP_BASE_VAR(sctp_pcb_initialized) == 0) {
7087                 SCTP_IPI_ITERATOR_WQ_UNLOCK();
7088                 SCTP_PRINTF("%s: rollback on initialize being %d it=%p\n", __func__,
7089                     SCTP_BASE_VAR(sctp_pcb_initialized), it);
7090                 SCTP_FREE(it, SCTP_M_ITER);
7091                 return (-1);
7092         }
7093         TAILQ_INSERT_TAIL(&sctp_it_ctl.iteratorhead, it, sctp_nxt_itr);
7094         if (sctp_it_ctl.iterator_running == 0) {
7095                 sctp_wakeup_iterator();
7096         }
7097         SCTP_IPI_ITERATOR_WQ_UNLOCK();
7098         /* sa_ignore MEMLEAK {memory is put on the tailq for the iterator} */
7099         return (0);
7100 }