sys/netinet/sctp_asconf.c

   1 /*-
   2  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions are met:
   6  *
   7  * a) Redistributions of source code must retain the above copyright notice,
   8  *   this list of conditions and the following disclaimer.
   9  *
  10  * b) Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in
  12  *   the documentation and/or other materials provided with the distribution.
  13  *
  14  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  15  *    contributors may be used to endorse or promote products derived
  16  *    from this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  20  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  22  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  28  * THE POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31 /* $KAME: sctp_asconf.c,v 1.24 2005/03/06 16:04:16 itojun Exp $  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35 #include <netinet/sctp_os.h>
  36 #include <netinet/sctp_var.h>
  37 #include <netinet/sctp_sysctl.h>
  38 #include <netinet/sctp_pcb.h>
  39 #include <netinet/sctp_header.h>
  40 #include <netinet/sctputil.h>
  41 #include <netinet/sctp_output.h>
  42 #include <netinet/sctp_asconf.h>
  43 #include <netinet/sctp_timer.h>
  44
  45 /*
  46  * debug flags:
  47  * SCTP_DEBUG_ASCONF1: protocol info, general info and errors
  48  * SCTP_DEBUG_ASCONF2: detailed info
  49  */
  50 #ifdef SCTP_DEBUG
  51 #endif                          /* SCTP_DEBUG */
  52
  53
  54 static void
  55 sctp_asconf_get_source_ip(struct mbuf *m, struct sockaddr *sa)
  56 {
  57         struct ip *iph;
  58         struct sockaddr_in *sin;
  59
  60 #ifdef INET6
  61         struct sockaddr_in6 *sin6;
  62
  63 #endif
  64
  65         iph = mtod(m, struct ip *);
  66         if (iph->ip_v == IPVERSION) {
  67                 /* IPv4 source */
  68                 sin = (struct sockaddr_in *)sa;
  69                 bzero(sin, sizeof(*sin));
  70                 sin->sin_family = AF_INET;
  71                 sin->sin_len = sizeof(struct sockaddr_in);
  72                 sin->sin_port = 0;
  73                 sin->sin_addr.s_addr = iph->ip_src.s_addr;
  74                 return;
  75         }
  76 #ifdef INET6
  77         else if (iph->ip_v == (IPV6_VERSION >> 4)) {
  78                 /* IPv6 source */
  79                 struct ip6_hdr *ip6;
  80
  81                 sin6 = (struct sockaddr_in6 *)sa;
  82                 bzero(sin6, sizeof(*sin6));
  83                 sin6->sin6_family = AF_INET6;
  84                 sin6->sin6_len = sizeof(struct sockaddr_in6);
  85                 sin6->sin6_port = 0;
  86                 ip6 = mtod(m, struct ip6_hdr *);
  87                 sin6->sin6_addr = ip6->ip6_src;
  88                 return;
  89         }
  90 #endif                          /* INET6 */
  91         else
  92                 return;
  93 }
  94
  95 /*
  96  * draft-ietf-tsvwg-addip-sctp
  97  *
  98  * An ASCONF parameter queue exists per asoc which holds the pending address
  99  * operations.  Lists are updated upon receipt of ASCONF-ACK.
 100  *
 101  * A restricted_addrs list exists per assoc to hold local addresses that are
 102  * not (yet) usable by the assoc as a source address.  These addresses are
 103  * either pending an ASCONF operation (and exist on the ASCONF parameter
 104  * queue), or they are permanently restricted (the peer has returned an
 105  * ERROR indication to an ASCONF(ADD), or the peer does not support ASCONF).
 106  *
 107  * Deleted addresses are always immediately removed from the lists as they will
 108  * (shortly) no longer exist in the kernel.  We send ASCONFs as a courtesy,
 109  * only if allowed.
 110  */
 111
 112 /*
 113  * ASCONF parameter processing.
 114  * response_required: set if a reply is required (eg. SUCCESS_REPORT).
 115  * returns a mbuf to an "error" response parameter or NULL/"success" if ok.
 116  * FIX: allocating this many mbufs on the fly is pretty inefficient...
 117  */
 118 static struct mbuf *
 119 sctp_asconf_success_response(uint32_t id)
 120 {
 121         struct mbuf *m_reply = NULL;
 122         struct sctp_asconf_paramhdr *aph;
 123
 124         m_reply = sctp_get_mbuf_for_msg(sizeof(struct sctp_asconf_paramhdr),
 125             0, M_DONTWAIT, 1, MT_DATA);
 126         if (m_reply == NULL) {
 127                 SCTPDBG(SCTP_DEBUG_ASCONF1,
 128                     "asconf_success_response: couldn't get mbuf!\n");
 129                 return NULL;
 130         }
 131         aph = mtod(m_reply, struct sctp_asconf_paramhdr *);
 132         aph->correlation_id = id;
 133         aph->ph.param_type = htons(SCTP_SUCCESS_REPORT);
 134         aph->ph.param_length = sizeof(struct sctp_asconf_paramhdr);
 135         SCTP_BUF_LEN(m_reply) = aph->ph.param_length;
 136         aph->ph.param_length = htons(aph->ph.param_length);
 137
 138         return m_reply;
 139 }
 140
 141 static struct mbuf *
 142 sctp_asconf_error_response(uint32_t id, uint16_t cause, uint8_t * error_tlv,
 143     uint16_t tlv_length)
 144 {
 145         struct mbuf *m_reply = NULL;
 146         struct sctp_asconf_paramhdr *aph;
 147         struct sctp_error_cause *error;
 148         uint8_t *tlv;
 149
 150         m_reply = sctp_get_mbuf_for_msg((sizeof(struct sctp_asconf_paramhdr) +
 151             tlv_length +
 152             sizeof(struct sctp_error_cause)),
 153             0, M_DONTWAIT, 1, MT_DATA);
 154         if (m_reply == NULL) {
 155                 SCTPDBG(SCTP_DEBUG_ASCONF1,
 156                     "asconf_error_response: couldn't get mbuf!\n");
 157                 return NULL;
 158         }
 159         aph = mtod(m_reply, struct sctp_asconf_paramhdr *);
 160         error = (struct sctp_error_cause *)(aph + 1);
 161
 162         aph->correlation_id = id;
 163         aph->ph.param_type = htons(SCTP_ERROR_CAUSE_IND);
 164         error->code = htons(cause);
 165         error->length = tlv_length + sizeof(struct sctp_error_cause);
 166         aph->ph.param_length = error->length +
 167             sizeof(struct sctp_asconf_paramhdr);
 168
 169         if (aph->ph.param_length > MLEN) {
 170                 SCTPDBG(SCTP_DEBUG_ASCONF1,
 171                     "asconf_error_response: tlv_length (%xh) too big\n",
 172                     tlv_length);
 173                 sctp_m_freem(m_reply);  /* discard */
 174                 return NULL;
 175         }
 176         if (error_tlv != NULL) {
 177                 tlv = (uint8_t *) (error + 1);
 178                 memcpy(tlv, error_tlv, tlv_length);
 179         }
 180         SCTP_BUF_LEN(m_reply) = aph->ph.param_length;
 181         error->length = htons(error->length);
 182         aph->ph.param_length = htons(aph->ph.param_length);
 183
 184         return m_reply;
 185 }
 186
 187 static struct mbuf *
 188 sctp_process_asconf_add_ip(struct mbuf *m, struct sctp_asconf_paramhdr *aph,
 189     struct sctp_tcb *stcb, int response_required)
 190 {
 191         struct mbuf *m_reply = NULL;
 192         struct sockaddr_storage sa_source, sa_store;
 193         struct sctp_ipv4addr_param *v4addr;
 194         uint16_t param_type, param_length, aparam_length;
 195         struct sockaddr *sa;
 196         struct sockaddr_in *sin;
 197         int zero_address = 0;
 198
 199 #ifdef INET6
 200         struct sockaddr_in6 *sin6;
 201         struct sctp_ipv6addr_param *v6addr;
 202
 203 #endif                          /* INET6 */
 204
 205         aparam_length = ntohs(aph->ph.param_length);
 206         v4addr = (struct sctp_ipv4addr_param *)(aph + 1);
 207 #ifdef INET6
 208         v6addr = (struct sctp_ipv6addr_param *)(aph + 1);
 209 #endif                          /* INET6 */
 210         param_type = ntohs(v4addr->ph.param_type);
 211         param_length = ntohs(v4addr->ph.param_length);
 212
 213         sa = (struct sockaddr *)&sa_store;
 214         switch (param_type) {
 215         case SCTP_IPV4_ADDRESS:
 216                 if (param_length != sizeof(struct sctp_ipv4addr_param)) {
 217                         /* invalid param size */
 218                         return NULL;
 219                 }
 220                 sin = (struct sockaddr_in *)&sa_store;
 221                 bzero(sin, sizeof(*sin));
 222                 sin->sin_family = AF_INET;
 223                 sin->sin_len = sizeof(struct sockaddr_in);
 224                 sin->sin_port = stcb->rport;
 225                 sin->sin_addr.s_addr = v4addr->addr;
 226                 if (sin->sin_addr.s_addr == INADDR_ANY)
 227                         zero_address = 1;
 228                 SCTPDBG(SCTP_DEBUG_ASCONF1, "process_asconf_add_ip: adding ");
 229                 SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, sa);
 230                 break;
 231         case SCTP_IPV6_ADDRESS:
 232 #ifdef INET6
 233                 if (param_length != sizeof(struct sctp_ipv6addr_param)) {
 234                         /* invalid param size */
 235                         return NULL;
 236                 }
 237                 sin6 = (struct sockaddr_in6 *)&sa_store;
 238                 bzero(sin6, sizeof(*sin6));
 239                 sin6->sin6_family = AF_INET6;
 240                 sin6->sin6_len = sizeof(struct sockaddr_in6);
 241                 sin6->sin6_port = stcb->rport;
 242                 memcpy((caddr_t)&sin6->sin6_addr, v6addr->addr,
 243                     sizeof(struct in6_addr));
 244                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
 245                         zero_address = 1;
 246                 SCTPDBG(SCTP_DEBUG_ASCONF1, "process_asconf_add_ip: adding ");
 247                 SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, sa);
 248 #else
 249                 /* IPv6 not enabled! */
 250                 /* FIX ME: currently sends back an invalid param error */
 251                 m_reply = sctp_asconf_error_response(aph->correlation_id,
 252                     SCTP_CAUSE_INVALID_PARAM, (uint8_t *) aph, aparam_length);
 253                 SCTPDBG(SCTP_DEBUG_ASCONF1,
 254                     "process_asconf_add_ip: v6 disabled- skipping ");
 255                 SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, sa);
 256                 return m_reply;
 257 #endif
 258                 break;
 259         default:
 260                 m_reply = sctp_asconf_error_response(aph->correlation_id,
 261                     SCTP_CAUSE_UNRESOLVABLE_ADDR, (uint8_t *) aph,
 262                     aparam_length);
 263                 return m_reply;
 264         }                       /* end switch */
 265
 266         /* if 0.0.0.0/::0, add the source address instead */
 267         if (zero_address && sctp_nat_friendly) {
 268                 sa = (struct sockaddr *)&sa_source;
 269                 sctp_asconf_get_source_ip(m, sa);
 270                 SCTPDBG(SCTP_DEBUG_ASCONF1,
 271                     "process_asconf_add_ip: using source addr ");
 272                 SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, sa);
 273         }
 274         /* add the address */
 275         if (sctp_add_remote_addr(stcb, sa, SCTP_DONOT_SETSCOPE,
 276             SCTP_ADDR_DYNAMIC_ADDED) != 0) {
 277                 SCTPDBG(SCTP_DEBUG_ASCONF1,
 278                     "process_asconf_add_ip: error adding address\n");
 279                 m_reply = sctp_asconf_error_response(aph->correlation_id,
 280                     SCTP_CAUSE_RESOURCE_SHORTAGE, (uint8_t *) aph,
 281                     aparam_length);
 282         } else {
 283                 /* notify upper layer */
 284                 sctp_ulp_notify(SCTP_NOTIFY_ASCONF_ADD_IP, stcb, 0, sa, SCTP_SO_NOT_LOCKED);
 285                 if (response_required) {
 286                         m_reply =
 287                             sctp_asconf_success_response(aph->correlation_id);
 288                 }
 289                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb,
 290                     NULL, SCTP_FROM_SCTP_ASCONF + SCTP_LOC_1);
 291                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
 292                     stcb, NULL);
 293         }
 294
 295         return m_reply;
 296 }
 297
 298 static int
 299 sctp_asconf_del_remote_addrs_except(struct sctp_tcb *stcb, struct sockaddr *src)
 300 {
 301         struct sctp_nets *src_net, *net;
 302
 303         /* make sure the source address exists as a destination net */
 304         src_net = sctp_findnet(stcb, src);
 305         if (src_net == NULL) {
 306                 /* not found */
 307                 return -1;
 308         }
 309         /* delete all destination addresses except the source */
 310         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 311                 if (net != src_net) {
 312                         /* delete this address */
 313                         sctp_remove_net(stcb, net);
 314                         SCTPDBG(SCTP_DEBUG_ASCONF1,
 315                             "asconf_del_remote_addrs_except: deleting ");
 316                         SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1,
 317                             (struct sockaddr *)&net->ro._l_addr);
 318                         /* notify upper layer */
 319                         sctp_ulp_notify(SCTP_NOTIFY_ASCONF_DELETE_IP, stcb, 0,
 320                             (struct sockaddr *)&net->ro._l_addr, SCTP_SO_NOT_LOCKED);
 321                 }
 322         }
 323         return 0;
 324 }
 325
 326 static struct mbuf *
 327 sctp_process_asconf_delete_ip(struct mbuf *m, struct sctp_asconf_paramhdr *aph,
 328     struct sctp_tcb *stcb, int response_required)
 329 {
 330         struct mbuf *m_reply = NULL;
 331         struct sockaddr_storage sa_source, sa_store;
 332         struct sctp_ipv4addr_param *v4addr;
 333         uint16_t param_type, param_length, aparam_length;
 334         struct sockaddr *sa;
 335         struct sockaddr_in *sin;
 336         int zero_address = 0;
 337         int result;
 338
 339 #ifdef INET6
 340         struct sockaddr_in6 *sin6;
 341         struct sctp_ipv6addr_param *v6addr;
 342
 343 #endif                          /* INET6 */
 344
 345         /* get the source IP address for src and 0.0.0.0/::0 delete checks */
 346         sctp_asconf_get_source_ip(m, (struct sockaddr *)&sa_source);
 347
 348         aparam_length = ntohs(aph->ph.param_length);
 349         v4addr = (struct sctp_ipv4addr_param *)(aph + 1);
 350 #ifdef INET6
 351         v6addr = (struct sctp_ipv6addr_param *)(aph + 1);
 352 #endif                          /* INET6 */
 353         param_type = ntohs(v4addr->ph.param_type);
 354         param_length = ntohs(v4addr->ph.param_length);
 355
 356         sa = (struct sockaddr *)&sa_store;
 357         switch (param_type) {
 358         case SCTP_IPV4_ADDRESS:
 359                 if (param_length != sizeof(struct sctp_ipv4addr_param)) {
 360                         /* invalid param size */
 361                         return NULL;
 362                 }
 363                 sin = (struct sockaddr_in *)&sa_store;
 364                 bzero(sin, sizeof(*sin));
 365                 sin->sin_family = AF_INET;
 366                 sin->sin_len = sizeof(struct sockaddr_in);
 367                 sin->sin_port = stcb->rport;
 368                 sin->sin_addr.s_addr = v4addr->addr;
 369                 if (sin->sin_addr.s_addr == INADDR_ANY)
 370                         zero_address = 1;
 371                 SCTPDBG(SCTP_DEBUG_ASCONF1,
 372                     "process_asconf_delete_ip: deleting ");
 373                 SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, sa);
 374                 break;
 375         case SCTP_IPV6_ADDRESS:
 376                 if (param_length != sizeof(struct sctp_ipv6addr_param)) {
 377                         /* invalid param size */
 378                         return NULL;
 379                 }
 380 #ifdef INET6
 381                 sin6 = (struct sockaddr_in6 *)&sa_store;
 382                 bzero(sin6, sizeof(*sin6));
 383                 sin6->sin6_family = AF_INET6;
 384                 sin6->sin6_len = sizeof(struct sockaddr_in6);
 385                 sin6->sin6_port = stcb->rport;
 386                 memcpy(&sin6->sin6_addr, v6addr->addr,
 387                     sizeof(struct in6_addr));
 388                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
 389                         zero_address = 1;
 390                 SCTPDBG(SCTP_DEBUG_ASCONF1,
 391                     "process_asconf_delete_ip: deleting ");
 392                 SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, sa);
 393 #else
 394                 /* IPv6 not enabled!  No "action" needed; just ack it */
 395                 SCTPDBG(SCTP_DEBUG_ASCONF1,
 396                     "process_asconf_delete_ip: v6 disabled- ignoring: ");
 397                 SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, sa);
 398                 /* just respond with a "success" ASCONF-ACK */
 399                 return NULL;
 400 #endif
 401                 break;
 402         default:
 403                 m_reply = sctp_asconf_error_response(aph->correlation_id,
 404                     SCTP_CAUSE_UNRESOLVABLE_ADDR, (uint8_t *) aph,
 405                     aparam_length);
 406                 return m_reply;
 407         }
 408
 409         /* make sure the source address is not being deleted */
 410         if (sctp_cmpaddr(sa, (struct sockaddr *)&sa_source)) {
 411                 /* trying to delete the source address! */
 412                 SCTPDBG(SCTP_DEBUG_ASCONF1, "process_asconf_delete_ip: tried to delete source addr\n");
 413                 m_reply = sctp_asconf_error_response(aph->correlation_id,
 414                     SCTP_CAUSE_DELETING_SRC_ADDR, (uint8_t *) aph,
 415                     aparam_length);
 416                 return m_reply;
 417         }
 418         /* if deleting 0.0.0.0/::0, delete all addresses except src addr */
 419         if (zero_address && sctp_nat_friendly) {
 420                 result = sctp_asconf_del_remote_addrs_except(stcb,
 421                     (struct sockaddr *)&sa_source);
 422
 423                 if (result) {
 424                         /* src address did not exist? */
 425                         SCTPDBG(SCTP_DEBUG_ASCONF1, "process_asconf_delete_ip: src addr does not exist?\n");
 426                         /* what error to reply with?? */
 427                         m_reply =
 428                             sctp_asconf_error_response(aph->correlation_id,
 429                             SCTP_CAUSE_REQUEST_REFUSED, (uint8_t *) aph,
 430                             aparam_length);
 431                 } else if (response_required) {
 432                         m_reply =
 433                             sctp_asconf_success_response(aph->correlation_id);
 434                 }
 435                 return m_reply;
 436         }
 437         /* delete the address */
 438         result = sctp_del_remote_addr(stcb, sa);
 439         /*
 440          * note if result == -2, the address doesn't exist in the asoc but
 441          * since it's being deleted anyways, we just ack the delete -- but
 442          * this probably means something has already gone awry
 443          */
 444         if (result == -1) {
 445                 /* only one address in the asoc */
 446                 SCTPDBG(SCTP_DEBUG_ASCONF1, "process_asconf_delete_ip: tried to delete last IP addr!\n");
 447                 m_reply = sctp_asconf_error_response(aph->correlation_id,
 448                     SCTP_CAUSE_DELETING_LAST_ADDR, (uint8_t *) aph,
 449                     aparam_length);
 450         } else {
 451                 if (response_required) {
 452                         m_reply = sctp_asconf_success_response(aph->correlation_id);
 453                 }
 454                 /* notify upper layer */
 455                 sctp_ulp_notify(SCTP_NOTIFY_ASCONF_DELETE_IP, stcb, 0, sa, SCTP_SO_NOT_LOCKED);
 456         }
 457         return m_reply;
 458 }
 459
 460 static struct mbuf *
 461 sctp_process_asconf_set_primary(struct mbuf *m,
 462     struct sctp_asconf_paramhdr *aph,
 463     struct sctp_tcb *stcb, int response_required)
 464 {
 465         struct mbuf *m_reply = NULL;
 466         struct sockaddr_storage sa_source, sa_store;
 467         struct sctp_ipv4addr_param *v4addr;
 468         uint16_t param_type, param_length, aparam_length;
 469         struct sockaddr *sa;
 470         struct sockaddr_in *sin;
 471         int zero_address = 0;
 472
 473 #ifdef INET6
 474         struct sockaddr_in6 *sin6;
 475         struct sctp_ipv6addr_param *v6addr;
 476
 477 #endif                          /* INET6 */
 478
 479         aparam_length = ntohs(aph->ph.param_length);
 480         v4addr = (struct sctp_ipv4addr_param *)(aph + 1);
 481 #ifdef INET6
 482         v6addr = (struct sctp_ipv6addr_param *)(aph + 1);
 483 #endif                          /* INET6 */
 484         param_type = ntohs(v4addr->ph.param_type);
 485         param_length = ntohs(v4addr->ph.param_length);
 486
 487         sa = (struct sockaddr *)&sa_store;
 488         switch (param_type) {
 489         case SCTP_IPV4_ADDRESS:
 490                 if (param_length != sizeof(struct sctp_ipv4addr_param)) {
 491                         /* invalid param size */
 492                         return NULL;
 493                 }
 494                 sin = (struct sockaddr_in *)&sa_store;
 495                 bzero(sin, sizeof(*sin));
 496                 sin->sin_family = AF_INET;
 497                 sin->sin_len = sizeof(struct sockaddr_in);
 498                 sin->sin_addr.s_addr = v4addr->addr;
 499                 if (sin->sin_addr.s_addr == INADDR_ANY)
 500                         zero_address = 1;
 501                 SCTPDBG(SCTP_DEBUG_ASCONF1, "process_asconf_set_primary: ");
 502                 SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, sa);
 503                 break;
 504         case SCTP_IPV6_ADDRESS:
 505                 if (param_length != sizeof(struct sctp_ipv6addr_param)) {
 506                         /* invalid param size */
 507                         return NULL;
 508                 }
 509 #ifdef INET6
 510                 sin6 = (struct sockaddr_in6 *)&sa_store;
 511                 bzero(sin6, sizeof(*sin6));
 512                 sin6->sin6_family = AF_INET6;
 513                 sin6->sin6_len = sizeof(struct sockaddr_in6);
 514                 memcpy((caddr_t)&sin6->sin6_addr, v6addr->addr,
 515                     sizeof(struct in6_addr));
 516                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
 517                         zero_address = 1;
 518                 SCTPDBG(SCTP_DEBUG_ASCONF1, "process_asconf_set_primary: ");
 519                 SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, sa);
 520 #else
 521                 /* IPv6 not enabled!  No "action" needed; just ack it */
 522                 SCTPDBG(SCTP_DEBUG_ASCONF1,
 523                     "process_asconf_set_primary: v6 disabled- ignoring: ");
 524                 SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, sa);
 525                 /* just respond with a "success" ASCONF-ACK */
 526                 return NULL;
 527 #endif
 528                 break;
 529         default:
 530                 m_reply = sctp_asconf_error_response(aph->correlation_id,
 531                     SCTP_CAUSE_UNRESOLVABLE_ADDR, (uint8_t *) aph,
 532                     aparam_length);
 533                 return m_reply;
 534         }
 535
 536         /* if 0.0.0.0/::0, use the source address instead */
 537         if (zero_address && sctp_nat_friendly) {
 538                 sa = (struct sockaddr *)&sa_source;
 539                 sctp_asconf_get_source_ip(m, sa);
 540                 SCTPDBG(SCTP_DEBUG_ASCONF1,
 541                     "process_asconf_set_primary: using source addr ");
 542                 SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, sa);
 543         }
 544         /* set the primary address */
 545         if (sctp_set_primary_addr(stcb, sa, NULL) == 0) {
 546                 SCTPDBG(SCTP_DEBUG_ASCONF1,
 547                     "process_asconf_set_primary: primary address set\n");
 548                 /* notify upper layer */
 549                 sctp_ulp_notify(SCTP_NOTIFY_ASCONF_SET_PRIMARY, stcb, 0, sa, SCTP_SO_NOT_LOCKED);
 550
 551                 if (response_required) {
 552                         m_reply = sctp_asconf_success_response(aph->correlation_id);
 553                 }
 554                 /*
 555                  * Mobility adaptation. Ideally, when the reception of SET
 556                  * PRIMARY with DELETE IP ADDRESS of the previous primary
 557                  * destination, unacknowledged DATA are retransmitted
 558                  * immediately to the new primary destination for seamless
 559                  * handover.  If the destination is UNCONFIRMED and marked
 560                  * to REQ_PRIM, The retransmission occur when reception of
 561                  * the HEARTBEAT-ACK.  (See sctp_handle_heartbeat_ack in
 562                  * sctp_input.c) Also, when change of the primary
 563                  * destination, it is better that all subsequent new DATA
 564                  * containing already queued DATA are transmitted to the new
 565                  * primary destination. (by micchie)
 566                  */
 567                 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
 568                     SCTP_MOBILITY_BASE) ||
 569                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 570                     SCTP_MOBILITY_FASTHANDOFF)) &&
 571                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 572                     SCTP_MOBILITY_PRIM_DELETED) &&
 573                     (stcb->asoc.primary_destination->dest_state &
 574                     SCTP_ADDR_UNCONFIRMED) == 0) {
 575
 576                         sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER + SCTP_LOC_7);
 577                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 578                             SCTP_MOBILITY_FASTHANDOFF)) {
 579                                 sctp_assoc_immediate_retrans(stcb,
 580                                     stcb->asoc.primary_destination);
 581                         }
 582                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 583                             SCTP_MOBILITY_BASE)) {
 584                                 sctp_move_chunks_from_deleted_prim(stcb,
 585                                     stcb->asoc.primary_destination);
 586                         }
 587                         sctp_delete_prim_timer(stcb->sctp_ep, stcb,
 588                             stcb->asoc.deleted_primary);
 589                 }
 590         } else {
 591                 /* couldn't set the requested primary address! */
 592                 SCTPDBG(SCTP_DEBUG_ASCONF1,
 593                     "process_asconf_set_primary: set primary failed!\n");
 594                 /* must have been an invalid address, so report */
 595                 m_reply = sctp_asconf_error_response(aph->correlation_id,
 596                     SCTP_CAUSE_UNRESOLVABLE_ADDR, (uint8_t *) aph,
 597                     aparam_length);
 598         }
 599
 600         return m_reply;
 601 }
 602
 603 /*
 604  * handles an ASCONF chunk.
 605  * if all parameters are processed ok, send a plain (empty) ASCONF-ACK
 606  */
 607 void
 608 sctp_handle_asconf(struct mbuf *m, unsigned int offset,
 609     struct sctp_asconf_chunk *cp, struct sctp_tcb *stcb,
 610     int first)
 611 {
 612         struct sctp_association *asoc;
 613         uint32_t serial_num;
 614         struct mbuf *n, *m_ack, *m_result, *m_tail;
 615         struct sctp_asconf_ack_chunk *ack_cp;
 616         struct sctp_asconf_paramhdr *aph, *ack_aph;
 617         struct sctp_ipv6addr_param *p_addr;
 618         unsigned int asconf_limit;
 619         int error = 0;          /* did an error occur? */
 620
 621         /* asconf param buffer */
 622         uint8_t aparam_buf[SCTP_PARAM_BUFFER_SIZE];
 623         struct sctp_asconf_ack *ack, *ack_next;
 624
 625         /* verify minimum length */
 626         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_asconf_chunk)) {
 627                 SCTPDBG(SCTP_DEBUG_ASCONF1,
 628                     "handle_asconf: chunk too small = %xh\n",
 629                     ntohs(cp->ch.chunk_length));
 630                 return;
 631         }
 632         asoc = &stcb->asoc;
 633         serial_num = ntohl(cp->serial_number);
 634
 635         if (compare_with_wrap(asoc->asconf_seq_in, serial_num, MAX_SEQ) ||
 636             serial_num == asoc->asconf_seq_in) {
 637                 /* got a duplicate ASCONF */
 638                 SCTPDBG(SCTP_DEBUG_ASCONF1,
 639                     "handle_asconf: got duplicate serial number = %xh\n",
 640                     serial_num);
 641                 return;
 642         } else if (serial_num != (asoc->asconf_seq_in + 1)) {
 643                 SCTPDBG(SCTP_DEBUG_ASCONF1, "handle_asconf: incorrect serial number = %xh (expected next = %xh)\n",
 644                     serial_num, asoc->asconf_seq_in + 1);
 645                 return;
 646         }
 647         /* it's the expected "next" sequence number, so process it */
 648         asoc->asconf_seq_in = serial_num;       /* update sequence */
 649         /* get length of all the param's in the ASCONF */
 650         asconf_limit = offset + ntohs(cp->ch.chunk_length);
 651         SCTPDBG(SCTP_DEBUG_ASCONF1,
 652             "handle_asconf: asconf_limit=%u, sequence=%xh\n",
 653             asconf_limit, serial_num);
 654
 655         if (first) {
 656                 /* delete old cache */
 657                 SCTPDBG(SCTP_DEBUG_ASCONF1, "handle_asconf: Now processing firstASCONF. Try to delte old cache\n");
 658
 659                 ack = TAILQ_FIRST(&stcb->asoc.asconf_ack_sent);
 660                 while (ack != NULL) {
 661                         ack_next = TAILQ_NEXT(ack, next);
 662                         if (ack->serial_number == serial_num)
 663                                 break;
 664                         SCTPDBG(SCTP_DEBUG_ASCONF1, "handle_asconf: delete old(%u) < first(%u)\n",
 665                             ack->serial_number, serial_num);
 666                         TAILQ_REMOVE(&stcb->asoc.asconf_ack_sent, ack, next);
 667                         if (ack->data != NULL) {
 668                                 sctp_m_freem(ack->data);
 669                         }
 670                         SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_asconf_ack, ack);
 671                         ack = ack_next;
 672                 }
 673         }
 674         m_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_asconf_ack_chunk), 0,
 675             M_DONTWAIT, 1, MT_DATA);
 676         if (m_ack == NULL) {
 677                 SCTPDBG(SCTP_DEBUG_ASCONF1,
 678                     "handle_asconf: couldn't get mbuf!\n");
 679                 return;
 680         }
 681         m_tail = m_ack;         /* current reply chain's tail */
 682
 683         /* fill in ASCONF-ACK header */
 684         ack_cp = mtod(m_ack, struct sctp_asconf_ack_chunk *);
 685         ack_cp->ch.chunk_type = SCTP_ASCONF_ACK;
 686         ack_cp->ch.chunk_flags = 0;
 687         ack_cp->serial_number = htonl(serial_num);
 688         /* set initial lengths (eg. just an ASCONF-ACK), ntohx at the end! */
 689         SCTP_BUF_LEN(m_ack) = sizeof(struct sctp_asconf_ack_chunk);
 690         ack_cp->ch.chunk_length = sizeof(struct sctp_asconf_ack_chunk);
 691
 692         /* skip the lookup address parameter */
 693         offset += sizeof(struct sctp_asconf_chunk);
 694         p_addr = (struct sctp_ipv6addr_param *)sctp_m_getptr(m, offset, sizeof(struct sctp_paramhdr), (uint8_t *) & aparam_buf);
 695         if (p_addr == NULL) {
 696                 SCTPDBG(SCTP_DEBUG_ASCONF1,
 697                     "handle_asconf: couldn't get lookup addr!\n");
 698                 /* respond with a missing/invalid mandatory parameter error */
 699                 return;
 700         }
 701         /* param_length is already validated in process_control... */
 702         offset += ntohs(p_addr->ph.param_length);       /* skip lookup addr */
 703
 704         /* get pointer to first asconf param in ASCONF-ACK */
 705         ack_aph = (struct sctp_asconf_paramhdr *)(mtod(m_ack, caddr_t)+sizeof(struct sctp_asconf_ack_chunk));
 706         if (ack_aph == NULL) {
 707                 SCTPDBG(SCTP_DEBUG_ASCONF1, "Gak in asconf2\n");
 708                 return;
 709         }
 710         /* get pointer to first asconf param in ASCONF */
 711         aph = (struct sctp_asconf_paramhdr *)sctp_m_getptr(m, offset, sizeof(struct sctp_asconf_paramhdr), (uint8_t *) & aparam_buf);
 712         if (aph == NULL) {
 713                 SCTPDBG(SCTP_DEBUG_ASCONF1, "Empty ASCONF received?\n");
 714                 goto send_reply;
 715         }
 716         /* process through all parameters */
 717         while (aph != NULL) {
 718                 unsigned int param_length, param_type;
 719
 720                 param_type = ntohs(aph->ph.param_type);
 721                 param_length = ntohs(aph->ph.param_length);
 722                 if (offset + param_length > asconf_limit) {
 723                         /* parameter goes beyond end of chunk! */
 724                         sctp_m_freem(m_ack);
 725                         return;
 726                 }
 727                 m_result = NULL;
 728
 729                 if (param_length > sizeof(aparam_buf)) {
 730                         SCTPDBG(SCTP_DEBUG_ASCONF1, "handle_asconf: param length (%u) larger than buffer size!\n", param_length);
 731                         sctp_m_freem(m_ack);
 732                         return;
 733                 }
 734                 if (param_length <= sizeof(struct sctp_paramhdr)) {
 735                         SCTPDBG(SCTP_DEBUG_ASCONF1, "handle_asconf: param length (%u) too short\n", param_length);
 736                         sctp_m_freem(m_ack);
 737                 }
 738                 /* get the entire parameter */
 739                 aph = (struct sctp_asconf_paramhdr *)sctp_m_getptr(m, offset, param_length, aparam_buf);
 740                 if (aph == NULL) {
 741                         SCTPDBG(SCTP_DEBUG_ASCONF1, "handle_asconf: couldn't get entire param\n");
 742                         sctp_m_freem(m_ack);
 743                         return;
 744                 }
 745                 switch (param_type) {
 746                 case SCTP_ADD_IP_ADDRESS:
 747                         asoc->peer_supports_asconf = 1;
 748                         m_result = sctp_process_asconf_add_ip(m, aph, stcb,
 749                             error);
 750                         break;
 751                 case SCTP_DEL_IP_ADDRESS:
 752                         asoc->peer_supports_asconf = 1;
 753                         m_result = sctp_process_asconf_delete_ip(m, aph, stcb,
 754                             error);
 755                         break;
 756                 case SCTP_ERROR_CAUSE_IND:
 757                         /* not valid in an ASCONF chunk */
 758                         break;
 759                 case SCTP_SET_PRIM_ADDR:
 760                         asoc->peer_supports_asconf = 1;
 761                         m_result = sctp_process_asconf_set_primary(m, aph,
 762                             stcb, error);
 763                         break;
 764                 case SCTP_SUCCESS_REPORT:
 765                         /* not valid in an ASCONF chunk */
 766                         break;
 767                 case SCTP_ULP_ADAPTATION:
 768                         /* FIX */
 769                         break;
 770                 default:
 771                         if ((param_type & 0x8000) == 0) {
 772                                 /* Been told to STOP at this param */
 773                                 asconf_limit = offset;
 774                                 /*
 775                                  * FIX FIX - We need to call
 776                                  * sctp_arethere_unrecognized_parameters()
 777                                  * to get a operr and send it for any
 778                                  * param's with the 0x4000 bit set OR do it
 779                                  * here ourselves... note we still must STOP
 780                                  * if the 0x8000 bit is clear.
 781                                  */
 782                         }
 783                         /* unknown/invalid param type */
 784                         break;
 785                 }               /* switch */
 786
 787                 /* add any (error) result to the reply mbuf chain */
 788                 if (m_result != NULL) {
 789                         SCTP_BUF_NEXT(m_tail) = m_result;
 790                         m_tail = m_result;
 791                         /* update lengths, make sure it's aligned too */
 792                         SCTP_BUF_LEN(m_result) = SCTP_SIZE32(SCTP_BUF_LEN(m_result));
 793                         ack_cp->ch.chunk_length += SCTP_BUF_LEN(m_result);
 794                         /* set flag to force success reports */
 795                         error = 1;
 796                 }
 797                 offset += SCTP_SIZE32(param_length);
 798                 /* update remaining ASCONF message length to process */
 799                 if (offset >= asconf_limit) {
 800                         /* no more data in the mbuf chain */
 801                         break;
 802                 }
 803                 /* get pointer to next asconf param */
 804                 aph = (struct sctp_asconf_paramhdr *)sctp_m_getptr(m, offset,
 805                     sizeof(struct sctp_asconf_paramhdr),
 806                     (uint8_t *) & aparam_buf);
 807                 if (aph == NULL) {
 808                         /* can't get an asconf paramhdr */
 809                         SCTPDBG(SCTP_DEBUG_ASCONF1, "handle_asconf: can't get asconf param hdr!\n");
 810                         /* FIX ME - add error here... */
 811                 }
 812         }
 813
 814 send_reply:
 815         ack_cp->ch.chunk_length = htons(ack_cp->ch.chunk_length);
 816         /* save the ASCONF-ACK reply */
 817         ack = SCTP_ZONE_GET(sctppcbinfo.ipi_zone_asconf_ack,
 818             struct sctp_asconf_ack);
 819         if (ack == NULL) {
 820                 sctp_m_freem(m_ack);
 821                 return;
 822         }
 823         ack->serial_number = serial_num;
 824         ack->last_sent_to = NULL;
 825         ack->data = m_ack;
 826         n = m_ack;
 827         while (n) {
 828                 ack->len += SCTP_BUF_LEN(n);
 829                 n = SCTP_BUF_NEXT(n);
 830         }
 831         TAILQ_INSERT_TAIL(&stcb->asoc.asconf_ack_sent, ack, next);
 832
 833         /* see if last_control_chunk_from is set properly (use IP src addr) */
 834         if (stcb->asoc.last_control_chunk_from == NULL) {
 835                 /*
 836                  * this could happen if the source address was just newly
 837                  * added
 838                  */
 839                 struct ip *iph;
 840                 struct sctphdr *sh;
 841                 struct sockaddr_storage from_store;
 842                 struct sockaddr *from = (struct sockaddr *)&from_store;
 843
 844                 SCTPDBG(SCTP_DEBUG_ASCONF1, "handle_asconf: looking up net for IP source address\n");
 845                 /* pullup already done, IP options already stripped */
 846                 iph = mtod(m, struct ip *);
 847                 sh = (struct sctphdr *)((caddr_t)iph + sizeof(*iph));
 848                 switch (iph->ip_v) {
 849                 case IPVERSION:
 850                         {
 851                                 struct sockaddr_in *from4;
 852
 853                                 from4 = (struct sockaddr_in *)&from_store;
 854                                 bzero(from4, sizeof(*from4));
 855                                 from4->sin_family = AF_INET;
 856                                 from4->sin_len = sizeof(struct sockaddr_in);
 857                                 from4->sin_addr.s_addr = iph->ip_src.s_addr;
 858                                 from4->sin_port = sh->src_port;
 859                                 break;
 860                         }
 861 #ifdef INET6
 862                 case IPV6_VERSION >> 4:
 863                         {
 864                                 struct ip6_hdr *ip6;
 865                                 struct sockaddr_in6 *from6;
 866
 867                                 ip6 = mtod(m, struct ip6_hdr *);
 868                                 from6 = (struct sockaddr_in6 *)&from_store;
 869                                 bzero(from6, sizeof(*from6));
 870                                 from6->sin6_family = AF_INET6;
 871                                 from6->sin6_len = sizeof(struct sockaddr_in6);
 872                                 from6->sin6_addr = ip6->ip6_src;
 873                                 from6->sin6_port = sh->src_port;
 874                                 /*
 875                                  * Get the scopes in properly to the sin6
 876                                  * addr's
 877                                  */
 878                                 /* we probably don't need these operations */
 879                                 (void)sa6_recoverscope(from6);
 880                                 sa6_embedscope(from6, ip6_use_defzone);
 881                                 break;
 882                         }
 883 #endif
 884                 default:
 885                         /* unknown address type */
 886                         from = NULL;
 887                 }
 888                 if (from != NULL) {
 889                         SCTPDBG(SCTP_DEBUG_ASCONF1, "Looking for IP source: ");
 890                         SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, from);
 891                         /* look up the from address */
 892                         stcb->asoc.last_control_chunk_from = sctp_findnet(stcb, from);
 893 #ifdef SCTP_DEBUG
 894                         if (stcb->asoc.last_control_chunk_from == NULL)
 895                                 SCTPDBG(SCTP_DEBUG_ASCONF1, "handle_asconf: IP source address not found?!\n");
 896 #endif
 897                 }
 898         }
 899 }
 900
 901 /*
 902  * does the address match? returns 0 if not, 1 if so
 903  */
 904 static uint32_t
 905 sctp_asconf_addr_match(struct sctp_asconf_addr *aa, struct sockaddr *sa)
 906 {
 907 #ifdef INET6
 908         if (sa->sa_family == AF_INET6) {
 909                 /* IPv6 sa address */
 910                 /* XXX scopeid */
 911                 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
 912
 913                 if ((aa->ap.addrp.ph.param_type == SCTP_IPV6_ADDRESS) &&
 914                     (memcmp(&aa->ap.addrp.addr, &sin6->sin6_addr,
 915                     sizeof(struct in6_addr)) == 0)) {
 916                         return (1);
 917                 }
 918         } else
 919 #endif                          /* INET6 */
 920         if (sa->sa_family == AF_INET) {
 921                 /* IPv4 sa address */
 922                 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
 923
 924                 if ((aa->ap.addrp.ph.param_type == SCTP_IPV4_ADDRESS) &&
 925                     (memcmp(&aa->ap.addrp.addr, &sin->sin_addr,
 926                     sizeof(struct in_addr)) == 0)) {
 927                         return (1);
 928                 }
 929         }
 930         return (0);
 931 }
 932
 933 /*
 934  * does the address match? returns 0 if not, 1 if so
 935  */
 936 static uint32_t
 937 sctp_addr_match(
 938 #ifdef INET6
 939     struct sctp_ipv6addr_param *v6addr,
 940 #else
 941     struct sctp_ipv4addr_param *v4addr,
 942 #endif
 943     struct sockaddr *sa)
 944 {
 945         uint16_t param_type, param_length;
 946
 947 #ifdef INET6
 948         struct sctp_ipv4addr_param *v4addr = (struct sctp_ipv4addr_param *)v6addr;
 949
 950         if (sa->sa_family == AF_INET6) {
 951                 /* IPv6 sa address */
 952                 /* XXX scopeid */
 953                 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
 954
 955                 param_type = ntohs(v6addr->ph.param_type);
 956                 param_length = ntohs(v6addr->ph.param_length);
 957
 958                 if ((param_type == SCTP_IPV6_ADDRESS) &&
 959                     param_length == sizeof(struct sctp_ipv6addr_param) &&
 960                     (memcmp(&v6addr->addr, &sin6->sin6_addr,
 961                     sizeof(struct in6_addr)) == 0)) {
 962                         return (1);
 963                 }
 964         } else
 965 #endif                          /* INET6 */
 966         if (sa->sa_family == AF_INET) {
 967                 /* IPv4 sa address */
 968                 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
 969
 970                 param_type = ntohs(v4addr->ph.param_type);
 971                 param_length = ntohs(v4addr->ph.param_length);
 972
 973                 if ((param_type == SCTP_IPV4_ADDRESS) &&
 974                     param_length == sizeof(struct sctp_ipv4addr_param) &&
 975                     (memcmp(&v4addr->addr, &sin->sin_addr,
 976                     sizeof(struct in_addr)) == 0)) {
 977                         return (1);
 978                 }
 979         }
 980         return (0);
 981 }
 982
 983 /*
 984  * Cleanup for non-responded/OP ERR'd ASCONF
 985  */
 986 void
 987 sctp_asconf_cleanup(struct sctp_tcb *stcb, struct sctp_nets *net)
 988 {
 989         /* mark peer as ASCONF incapable */
 990         stcb->asoc.peer_supports_asconf = 0;
 991         /*
 992          * clear out any existing asconfs going out
 993          */
 994         sctp_timer_stop(SCTP_TIMER_TYPE_ASCONF, stcb->sctp_ep, stcb, net,
 995             SCTP_FROM_SCTP_ASCONF + SCTP_LOC_2);
 996         stcb->asoc.asconf_seq_out_acked = stcb->asoc.asconf_seq_out;
 997         /* remove the old ASCONF on our outbound queue */
 998         sctp_toss_old_asconf(stcb);
 999 }
1000
1001 /*
1002  * cleanup any cached source addresses that may be topologically
1003  * incorrect after a new address has been added to this interface.
1004  */
1005 static void
1006 sctp_asconf_nets_cleanup(struct sctp_tcb *stcb, struct sctp_ifn *ifn)
1007 {
1008         struct sctp_nets *net;
1009
1010         /*
1011          * Ideally, we want to only clear cached routes and source addresses
1012          * that are topologically incorrect.  But since there is no easy way
1013          * to know whether the newly added address on the ifn would cause a
1014          * routing change (i.e. a new egress interface would be chosen)
1015          * without doing a new routing lookup and source address selection,
1016          * we will (for now) just flush any cached route using a different
1017          * ifn (and cached source addrs) and let output re-choose them
1018          * during the next send on that net.
1019          */
1020         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1021                 /*
1022                  * clear any cached route (and cached source address) if the
1023                  * route's interface is NOT the same as the address change.
1024                  * If it's the same interface, just clear the cached source
1025                  * address.
1026                  */
1027                 if (SCTP_ROUTE_HAS_VALID_IFN(&net->ro) &&
1028                     SCTP_GET_IF_INDEX_FROM_ROUTE(&net->ro) != ifn->ifn_index) {
1029                         /* clear any cached route */
1030                         RTFREE(net->ro.ro_rt);
1031                         net->ro.ro_rt = NULL;
1032                 }
1033                 /* clear any cached source address */
1034                 if (net->src_addr_selected) {
1035                         sctp_free_ifa(net->ro._s_addr);
1036                         net->ro._s_addr = NULL;
1037                         net->src_addr_selected = 0;
1038                 }
1039         }
1040 }
1041
1042 void
1043 sctp_move_chunks_from_deleted_prim(struct sctp_tcb *stcb, struct sctp_nets *dst)
1044 {
1045         struct sctp_association *asoc;
1046         struct sctp_stream_out *outs;
1047         struct sctp_tmit_chunk *chk;
1048         struct sctp_stream_queue_pending *sp;
1049
1050         if (dst->dest_state & SCTP_ADDR_UNCONFIRMED) {
1051                 return;
1052         }
1053         if (stcb->asoc.deleted_primary == NULL) {
1054                 return;
1055         }
1056         asoc = &stcb->asoc;
1057
1058         /*
1059          * now through all the streams checking for chunks sent to our bad
1060          * network.
1061          */
1062         TAILQ_FOREACH(outs, &asoc->out_wheel, next_spoke) {
1063                 /* now clean up any chunks here */
1064                 TAILQ_FOREACH(sp, &outs->outqueue, next) {
1065                         if (sp->net == asoc->deleted_primary) {
1066                                 sctp_free_remote_addr(sp->net);
1067                                 sp->net = dst;
1068                                 atomic_add_int(&dst->ref_count, 1);
1069                         }
1070                 }
1071         }
1072         /* Now check the pending queue */
1073         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
1074                 if (chk->whoTo == asoc->deleted_primary) {
1075                         sctp_free_remote_addr(chk->whoTo);
1076                         chk->whoTo = dst;
1077                         atomic_add_int(&dst->ref_count, 1);
1078                 }
1079         }
1080
1081 }
1082
1083
1084 void
1085 sctp_assoc_immediate_retrans(struct sctp_tcb *stcb, struct sctp_nets *dstnet)
1086 {
1087         int error;
1088
1089         if (dstnet->dest_state & SCTP_ADDR_UNCONFIRMED) {
1090                 return;
1091         }
1092         if (stcb->asoc.deleted_primary == NULL) {
1093                 return;
1094         }
1095         if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
1096                 SCTPDBG(SCTP_DEBUG_ASCONF1, "assoc_immediate_retrans: Deleted primary is ");
1097                 SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, &stcb->asoc.deleted_primary->ro._l_addr.sa);
1098                 SCTPDBG(SCTP_DEBUG_ASCONF1, "Current Primary is ");
1099                 SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, &stcb->asoc.primary_destination->ro._l_addr.sa);
1100                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb,
1101                     stcb->asoc.deleted_primary,
1102                     SCTP_FROM_SCTP_TIMER + SCTP_LOC_8);
1103                 stcb->asoc.num_send_timers_up--;
1104                 if (stcb->asoc.num_send_timers_up < 0) {
1105                         stcb->asoc.num_send_timers_up = 0;
1106                 }
1107                 SCTP_TCB_LOCK_ASSERT(stcb);
1108                 error = sctp_t3rxt_timer(stcb->sctp_ep, stcb,
1109                     stcb->asoc.deleted_primary);
1110                 if (error) {
1111                         SCTP_INP_DECR_REF(stcb->sctp_ep);
1112                         return;
1113                 }
1114                 SCTP_TCB_LOCK_ASSERT(stcb);
1115 #ifdef SCTP_AUDITING_ENABLED
1116                 sctp_auditing(4, stcb->sctp_ep, stcb->asoc.deleted_primary);
1117 #endif
1118                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_T3, SCTP_SO_NOT_LOCKED);
1119                 if ((stcb->asoc.num_send_timers_up == 0) &&
1120                     (stcb->asoc.sent_queue_cnt > 0)) {
1121                         struct sctp_tmit_chunk *chk;
1122
1123                         chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
1124                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
1125                             stcb, chk->whoTo);
1126                 }
1127         }
1128         return;
1129 }
1130
1131 static int
1132     sctp_asconf_queue_mgmt(struct sctp_tcb *, struct sctp_ifa *, uint16_t);
1133
1134 void
1135 sctp_net_immediate_retrans(struct sctp_tcb *stcb, struct sctp_nets *net)
1136 {
1137         struct sctp_tmit_chunk *chk;
1138
1139         SCTPDBG(SCTP_DEBUG_ASCONF1, "net_immediate_retrans: RTO is %d\n", net->RTO);
1140         sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, net,
1141             SCTP_FROM_SCTP_TIMER + SCTP_LOC_5);
1142         stcb->asoc.cc_functions.sctp_set_initial_cc_param(stcb, net);
1143         net->error_count = 0;
1144         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1145                 if (chk->whoTo == net) {
1146                         if (chk->sent < SCTP_DATAGRAM_RESEND) {
1147                                 chk->sent = SCTP_DATAGRAM_RESEND;
1148                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1149                                 sctp_flight_size_decrease(chk);
1150                                 sctp_total_flight_decrease(stcb, chk);
1151                                 net->marked_retrans++;
1152                                 stcb->asoc.marked_retrans++;
1153                         }
1154                 }
1155         }
1156         if (net->marked_retrans) {
1157                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_T3, SCTP_SO_NOT_LOCKED);
1158         }
1159 }
1160
1161 static void
1162 sctp_path_check_and_react(struct sctp_tcb *stcb, struct sctp_ifa *newifa)
1163 {
1164         struct sctp_nets *net;
1165         int addrnum, changed;
1166
1167         /*
1168          * If number of local valid addresses is 1, the valid address is
1169          * probably newly added address.  Several valid addresses in this
1170          * association.  A source address may not be changed.  Additionally,
1171          * they can be configured on a same interface as "alias" addresses.
1172          * (by micchie)
1173          */
1174         addrnum = sctp_local_addr_count(stcb);
1175         SCTPDBG(SCTP_DEBUG_ASCONF1, "p_check_react(): %d local addresses\n",
1176             addrnum);
1177         if (addrnum == 1) {
1178                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1179                         /* clear any cached route and source address */
1180                         if (net->ro.ro_rt) {
1181                                 RTFREE(net->ro.ro_rt);
1182                                 net->ro.ro_rt = NULL;
1183                         }
1184                         if (net->src_addr_selected) {
1185                                 sctp_free_ifa(net->ro._s_addr);
1186                                 net->ro._s_addr = NULL;
1187                                 net->src_addr_selected = 0;
1188                         }
1189                         /* Retransmit unacknowledged DATA chunks immediately */
1190                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
1191                             SCTP_MOBILITY_FASTHANDOFF)) {
1192                                 sctp_net_immediate_retrans(stcb, net);
1193                         }
1194                         /* also, SET PRIMARY is maybe already sent */
1195                 }
1196                 return;
1197         }
1198         /* Multiple local addresses exsist in the association.  */
1199         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1200                 /* clear any cached route and source address */
1201                 if (net->ro.ro_rt) {
1202                         RTFREE(net->ro.ro_rt);
1203                         net->ro.ro_rt = NULL;
1204                 }
1205                 if (net->src_addr_selected) {
1206                         sctp_free_ifa(net->ro._s_addr);
1207                         net->ro._s_addr = NULL;
1208                         net->src_addr_selected = 0;
1209                 }
1210                 /*
1211                  * Check if the nexthop is corresponding to the new address.
1212                  * If the new address is corresponding to the current
1213                  * nexthop, the path will be changed.  If the new address is
1214                  * NOT corresponding to the current nexthop, the path will
1215                  * not be changed.
1216                  */
1217                 SCTP_RTALLOC((sctp_route_t *) & net->ro,
1218                     stcb->sctp_ep->def_vrf_id);
1219                 if (net->ro.ro_rt == NULL)
1220                         continue;
1221
1222                 changed = 0;
1223                 if (net->ro._l_addr.sa.sa_family == AF_INET) {
1224                         if (sctp_v4src_match_nexthop(newifa, (sctp_route_t *) & net->ro))
1225                                 changed = 1;
1226                 }
1227 #ifdef INET6
1228                 if (net->ro._l_addr.sa.sa_family == AF_INET6) {
1229                         if (sctp_v6src_match_nexthop(
1230                             &newifa->address.sin6, (sctp_route_t *) & net->ro))
1231                                 changed = 1;
1232                 }
1233 #endif
1234                 /*
1235                  * if the newly added address does not relate routing
1236                  * information, we skip.
1237                  */
1238                 if (changed == 0)
1239                         continue;
1240                 /* Retransmit unacknowledged DATA chunks immediately */
1241                 if (sctp_is_mobility_feature_on(stcb->sctp_ep,
1242                     SCTP_MOBILITY_FASTHANDOFF)) {
1243                         sctp_net_immediate_retrans(stcb, net);
1244                 }
1245                 /* Send SET PRIMARY for this new address */
1246                 if (net == stcb->asoc.primary_destination) {
1247                         (void)sctp_asconf_queue_mgmt(stcb, newifa,
1248                             SCTP_SET_PRIM_ADDR);
1249                 }
1250         }
1251 }
1252
1253 /*
1254  * process an ADD/DELETE IP ack from peer.
1255  * addr: corresponding sctp_ifa to the address being added/deleted.
1256  * type: SCTP_ADD_IP_ADDRESS or SCTP_DEL_IP_ADDRESS.
1257  * flag: 1=success, 0=failure.
1258  */
1259 static void
1260 sctp_asconf_addr_mgmt_ack(struct sctp_tcb *stcb, struct sctp_ifa *addr,
1261     uint16_t type, uint32_t flag)
1262 {
1263         /*
1264          * do the necessary asoc list work- if we get a failure indication,
1265          * leave the address on the assoc's restricted list.  If we get a
1266          * success indication, remove the address from the restricted list.
1267          */
1268         /*
1269          * Note: this will only occur for ADD_IP_ADDRESS, since
1270          * DEL_IP_ADDRESS is never actually added to the list...
1271          */
1272         if (flag) {
1273                 /* success case, so remove from the restricted list */
1274                 sctp_del_local_addr_restricted(stcb, addr);
1275
1276                 if (sctp_is_mobility_feature_on(stcb->sctp_ep,
1277                     SCTP_MOBILITY_BASE) ||
1278                     sctp_is_mobility_feature_on(stcb->sctp_ep,
1279                     SCTP_MOBILITY_FASTHANDOFF)) {
1280                         sctp_path_check_and_react(stcb, addr);
1281                         return;
1282                 }
1283                 /* clear any cached/topologically incorrect source addresses */
1284                 sctp_asconf_nets_cleanup(stcb, addr->ifn_p);
1285         }
1286         /* else, leave it on the list */
1287 }
1288
1289 /*
1290  * add an asconf add/delete/set primary IP address parameter to the queue.
1291  * type = SCTP_ADD_IP_ADDRESS, SCTP_DEL_IP_ADDRESS, SCTP_SET_PRIM_ADDR.
1292  * returns 0 if queued, -1 if not queued/removed.
1293  * NOTE: if adding, but a delete for the same address is already scheduled
1294  * (and not yet sent out), simply remove it from queue.  Same for deleting
1295  * an address already scheduled for add.  If a duplicate operation is found,
1296  * ignore the new one.
1297  */
1298 static int
1299 sctp_asconf_queue_mgmt(struct sctp_tcb *stcb, struct sctp_ifa *ifa,
1300     uint16_t type)
1301 {
1302         struct sctp_asconf_addr *aa, *aa_next;
1303         struct sockaddr *sa;
1304
1305         /* make sure the request isn't already in the queue */
1306         for (aa = TAILQ_FIRST(&stcb->asoc.asconf_queue); aa != NULL;
1307             aa = aa_next) {
1308                 aa_next = TAILQ_NEXT(aa, next);
1309                 /* address match? */
1310                 if (sctp_asconf_addr_match(aa, &ifa->address.sa) == 0)
1311                         continue;
1312                 /*
1313                  * is the request already in queue but not sent? pass the
1314                  * request already sent in order to resolve the following
1315                  * case: 1. arrival of ADD, then sent 2. arrival of DEL. we
1316                  * can't remove the ADD request already sent 3. arrival of
1317                  * ADD
1318                  */
1319                 if (aa->ap.aph.ph.param_type == type && aa->sent == 0) {
1320                         return (-1);
1321                 }
1322                 /* is the negative request already in queue, and not sent */
1323                 if ((aa->sent == 0) && (type == SCTP_ADD_IP_ADDRESS) &&
1324                     (aa->ap.aph.ph.param_type == SCTP_DEL_IP_ADDRESS)) {
1325                         /* add requested, delete already queued */
1326                         TAILQ_REMOVE(&stcb->asoc.asconf_queue, aa, next);
1327                         /* remove the ifa from the restricted list */
1328                         sctp_del_local_addr_restricted(stcb, ifa);
1329                         /* free the asconf param */
1330                         SCTP_FREE(aa, SCTP_M_ASC_ADDR);
1331                         SCTPDBG(SCTP_DEBUG_ASCONF2, "asconf_queue_mgmt: add removes queued entry\n");
1332                         return (-1);
1333                 }
1334                 if ((aa->sent == 0) && (type == SCTP_DEL_IP_ADDRESS) &&
1335                     (aa->ap.aph.ph.param_type == SCTP_ADD_IP_ADDRESS)) {
1336                         /* delete requested, add already queued */
1337                         TAILQ_REMOVE(&stcb->asoc.asconf_queue, aa, next);
1338                         /* remove the aa->ifa from the restricted list */
1339                         sctp_del_local_addr_restricted(stcb, aa->ifa);
1340                         /* free the asconf param */
1341                         SCTP_FREE(aa, SCTP_M_ASC_ADDR);
1342                         SCTPDBG(SCTP_DEBUG_ASCONF2, "asconf_queue_mgmt: delete removes queued entry\n");
1343                         return (-1);
1344                 }
1345         }                       /* for each aa */
1346
1347         /* adding new request to the queue */
1348         SCTP_MALLOC(aa, struct sctp_asconf_addr *, sizeof(*aa),
1349             SCTP_M_ASC_ADDR);
1350         if (aa == NULL) {
1351                 /* didn't get memory */
1352                 SCTPDBG(SCTP_DEBUG_ASCONF1, "asconf_queue_mgmt: failed to get memory!\n");
1353                 return (-1);
1354         }
1355         /* fill in asconf address parameter fields */
1356         /* top level elements are "networked" during send */
1357         aa->ap.aph.ph.param_type = type;
1358         aa->ifa = ifa;
1359         atomic_add_int(&ifa->refcount, 1);
1360         /* correlation_id filled in during send routine later... */
1361         if (ifa->address.sa.sa_family == AF_INET6) {
1362                 /* IPv6 address */
1363                 struct sockaddr_in6 *sin6;
1364
1365                 sin6 = (struct sockaddr_in6 *)&ifa->address.sa;
1366                 sa = (struct sockaddr *)sin6;
1367                 aa->ap.addrp.ph.param_type = SCTP_IPV6_ADDRESS;
1368                 aa->ap.addrp.ph.param_length = (sizeof(struct sctp_ipv6addr_param));
1369                 aa->ap.aph.ph.param_length = sizeof(struct sctp_asconf_paramhdr) +
1370                     sizeof(struct sctp_ipv6addr_param);
1371                 memcpy(&aa->ap.addrp.addr, &sin6->sin6_addr,
1372                     sizeof(struct in6_addr));
1373         } else if (ifa->address.sa.sa_family == AF_INET) {
1374                 /* IPv4 address */
1375                 struct sockaddr_in *sin;
1376
1377                 sin = (struct sockaddr_in *)&ifa->address.sa;
1378                 sa = (struct sockaddr *)sin;
1379                 aa->ap.addrp.ph.param_type = SCTP_IPV4_ADDRESS;
1380                 aa->ap.addrp.ph.param_length = (sizeof(struct sctp_ipv4addr_param));
1381                 aa->ap.aph.ph.param_length = sizeof(struct sctp_asconf_paramhdr) +
1382                     sizeof(struct sctp_ipv4addr_param);
1383                 memcpy(&aa->ap.addrp.addr, &sin->sin_addr,
1384                     sizeof(struct in_addr));
1385         } else {
1386                 /* invalid family! */
1387                 SCTP_FREE(aa, SCTP_M_ASC_ADDR);
1388                 sctp_free_ifa(ifa);
1389                 return (-1);
1390         }
1391         aa->sent = 0;           /* clear sent flag */
1392
1393         TAILQ_INSERT_TAIL(&stcb->asoc.asconf_queue, aa, next);
1394 #ifdef SCTP_DEBUG
1395         if (sctp_debug_on && SCTP_DEBUG_ASCONF2) {
1396                 if (type == SCTP_ADD_IP_ADDRESS) {
1397                         SCTP_PRINTF("asconf_queue_mgmt: inserted asconf ADD_IP_ADDRESS: ");
1398                         SCTPDBG_ADDR(SCTP_DEBUG_ASCONF2, sa);
1399                 } else if (type == SCTP_DEL_IP_ADDRESS) {
1400                         SCTP_PRINTF("asconf_queue_mgmt: appended asconf DEL_IP_ADDRESS: ");
1401                         SCTPDBG_ADDR(SCTP_DEBUG_ASCONF2, sa);
1402                 } else {
1403                         SCTP_PRINTF("asconf_queue_mgmt: appended asconf SET_PRIM_ADDR: ");
1404                         SCTPDBG_ADDR(SCTP_DEBUG_ASCONF2, sa);
1405                 }
1406         }
1407 #endif
1408
1409         return (0);
1410 }
1411
1412
1413 /*
1414  * add an asconf operation for the given ifa and type.
1415  * type = SCTP_ADD_IP_ADDRESS, SCTP_DEL_IP_ADDRESS, SCTP_SET_PRIM_ADDR.
1416  * returns 0 if completed, -1 if not completed, 1 if immediate send is
1417  * advisable.
1418  */
1419 static int
1420 sctp_asconf_queue_add(struct sctp_tcb *stcb, struct sctp_ifa *ifa,
1421     uint16_t type)
1422 {
1423         uint32_t status;
1424         int pending_delete_queued = 0;
1425
1426         /* see if peer supports ASCONF */
1427         if (stcb->asoc.peer_supports_asconf == 0) {
1428                 return (-1);
1429         }
1430         /*
1431          * if this is deleting the last address from the assoc, mark it as
1432          * pending.
1433          */
1434         if ((type == SCTP_DEL_IP_ADDRESS) && !stcb->asoc.asconf_del_pending &&
1435             (sctp_local_addr_count(stcb) < 2)) {
1436                 /* set the pending delete info only */
1437                 stcb->asoc.asconf_del_pending = 1;
1438                 stcb->asoc.asconf_addr_del_pending = ifa;
1439                 atomic_add_int(&ifa->refcount, 1);
1440                 SCTPDBG(SCTP_DEBUG_ASCONF2,
1441                     "asconf_queue_add: mark delete last address pending\n");
1442                 return (-1);
1443         }
1444         /* queue an asconf parameter */
1445         status = sctp_asconf_queue_mgmt(stcb, ifa, type);
1446
1447         /*
1448          * if this is an add, and there is a delete also pending (i.e. the
1449          * last local address is being changed), queue the pending delete
1450          * too.
1451          */
1452         if ((type == SCTP_ADD_IP_ADDRESS) && stcb->asoc.asconf_del_pending && (status == 0)) {
1453                 /* queue in the pending delete */
1454                 if (sctp_asconf_queue_mgmt(stcb,
1455                     stcb->asoc.asconf_addr_del_pending,
1456                     SCTP_DEL_IP_ADDRESS) == 0) {
1457                         SCTPDBG(SCTP_DEBUG_ASCONF2, "asconf_queue_add: queing pending delete\n");
1458                         pending_delete_queued = 1;
1459                         /* clear out the pending delete info */
1460                         stcb->asoc.asconf_del_pending = 0;
1461                         sctp_free_ifa(stcb->asoc.asconf_addr_del_pending);
1462                         stcb->asoc.asconf_addr_del_pending = NULL;
1463                 }
1464         }
1465         if (pending_delete_queued) {
1466                 struct sctp_nets *net;
1467
1468                 /*
1469                  * since we know that the only/last address is now being
1470                  * changed in this case, reset the cwnd/rto on all nets to
1471                  * start as a new address and path.  Also clear the error
1472                  * counts to give the assoc the best chance to complete the
1473                  * address change.
1474                  */
1475                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1476                         stcb->asoc.cc_functions.sctp_set_initial_cc_param(stcb,
1477                             net);
1478                         net->RTO = 0;
1479                         net->error_count = 0;
1480                 }
1481                 stcb->asoc.overall_error_count = 0;
1482                 if (sctp_logging_level & SCTP_THRESHOLD_LOGGING) {
1483                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1484                             stcb->asoc.overall_error_count,
1485                             0,
1486                             SCTP_FROM_SCTP_ASCONF,
1487                             __LINE__);
1488                 }
1489                 /* queue in an advisory set primary too */
1490                 (void)sctp_asconf_queue_mgmt(stcb, ifa, SCTP_SET_PRIM_ADDR);
1491                 /* let caller know we should send this out immediately */
1492                 status = 1;
1493         }
1494         return (status);
1495 }
1496
1497 /*-
1498  * add an asconf delete IP address parameter to the queue by sockaddr and
1499  * possibly with no sctp_ifa available.  This is only called by the routine
1500  * that checks the addresses in an INIT-ACK against the current address list.
1501  * returns 0 if completed, non-zero if not completed.
1502  * NOTE: if an add is already scheduled (and not yet sent out), simply
1503  * remove it from queue.  If a duplicate operation is found, ignore the
1504  * new one.
1505  */
1506 static int
1507 sctp_asconf_queue_sa_delete(struct sctp_tcb *stcb, struct sockaddr *sa)
1508 {
1509         struct sctp_ifa *ifa;
1510         struct sctp_asconf_addr *aa, *aa_next;
1511         uint32_t vrf_id;
1512
1513         if (stcb == NULL) {
1514                 return (-1);
1515         }
1516         /* see if peer supports ASCONF */
1517         if (stcb->asoc.peer_supports_asconf == 0) {
1518                 return (-1);
1519         }
1520         /* make sure the request isn't already in the queue */
1521         for (aa = TAILQ_FIRST(&stcb->asoc.asconf_queue); aa != NULL;
1522             aa = aa_next) {
1523                 aa_next = TAILQ_NEXT(aa, next);
1524                 /* address match? */
1525                 if (sctp_asconf_addr_match(aa, sa) == 0)
1526                         continue;
1527                 /* is the request already in queue (sent or not) */
1528                 if (aa->ap.aph.ph.param_type == SCTP_DEL_IP_ADDRESS) {
1529                         return (-1);
1530                 }
1531                 /* is the negative request already in queue, and not sent */
1532                 if (aa->sent == 1)
1533                         continue;
1534                 if (aa->ap.aph.ph.param_type == SCTP_ADD_IP_ADDRESS) {
1535                         /* add already queued, so remove existing entry */
1536                         TAILQ_REMOVE(&stcb->asoc.asconf_queue, aa, next);
1537                         sctp_del_local_addr_restricted(stcb, aa->ifa);
1538                         /* free the entry */
1539                         SCTP_FREE(aa, SCTP_M_ASC_ADDR);
1540                         return (-1);
1541                 }
1542         }                       /* for each aa */
1543
1544         /* find any existing ifa-- NOTE ifa CAN be allowed to be NULL */
1545         if (stcb) {
1546                 vrf_id = stcb->asoc.vrf_id;
1547         } else {
1548                 vrf_id = SCTP_DEFAULT_VRFID;
1549         }
1550         ifa = sctp_find_ifa_by_addr(sa, vrf_id, SCTP_ADDR_NOT_LOCKED);
1551
1552         /* adding new request to the queue */
1553         SCTP_MALLOC(aa, struct sctp_asconf_addr *, sizeof(*aa),
1554             SCTP_M_ASC_ADDR);
1555         if (aa == NULL) {
1556                 /* didn't get memory */
1557                 SCTPDBG(SCTP_DEBUG_ASCONF1,
1558                     "sctp_asconf_queue_sa_delete: failed to get memory!\n");
1559                 return (-1);
1560         }
1561         /* fill in asconf address parameter fields */
1562         /* top level elements are "networked" during send */
1563         aa->ap.aph.ph.param_type = SCTP_DEL_IP_ADDRESS;
1564         aa->ifa = ifa;
1565         if (ifa)
1566                 atomic_add_int(&ifa->refcount, 1);
1567         /* correlation_id filled in during send routine later... */
1568         if (sa->sa_family == AF_INET6) {
1569                 /* IPv6 address */
1570                 struct sockaddr_in6 *sin6;
1571
1572                 sin6 = (struct sockaddr_in6 *)sa;
1573                 aa->ap.addrp.ph.param_type = SCTP_IPV6_ADDRESS;
1574                 aa->ap.addrp.ph.param_length = (sizeof(struct sctp_ipv6addr_param));
1575                 aa->ap.aph.ph.param_length = sizeof(struct sctp_asconf_paramhdr) + sizeof(struct sctp_ipv6addr_param);
1576                 memcpy(&aa->ap.addrp.addr, &sin6->sin6_addr,
1577                     sizeof(struct in6_addr));
1578         } else if (sa->sa_family == AF_INET) {
1579                 /* IPv4 address */
1580                 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
1581
1582                 aa->ap.addrp.ph.param_type = SCTP_IPV4_ADDRESS;
1583                 aa->ap.addrp.ph.param_length = (sizeof(struct sctp_ipv4addr_param));
1584                 aa->ap.aph.ph.param_length = sizeof(struct sctp_asconf_paramhdr) + sizeof(struct sctp_ipv4addr_param);
1585                 memcpy(&aa->ap.addrp.addr, &sin->sin_addr,
1586                     sizeof(struct in_addr));
1587         } else {
1588                 /* invalid family! */
1589                 SCTP_FREE(aa, SCTP_M_ASC_ADDR);
1590                 if (ifa)
1591                         sctp_free_ifa(ifa);
1592                 return (-1);
1593         }
1594         aa->sent = 0;           /* clear sent flag */
1595
1596         /* delete goes to the back of the queue */
1597         TAILQ_INSERT_TAIL(&stcb->asoc.asconf_queue, aa, next);
1598
1599         /* sa_ignore MEMLEAK {memory is put on the tailq} */
1600         return (0);
1601 }
1602
1603 /*
1604  * find a specific asconf param on our "sent" queue
1605  */
1606 static struct sctp_asconf_addr *
1607 sctp_asconf_find_param(struct sctp_tcb *stcb, uint32_t correlation_id)
1608 {
1609         struct sctp_asconf_addr *aa;
1610
1611         TAILQ_FOREACH(aa, &stcb->asoc.asconf_queue, next) {
1612                 if (aa->ap.aph.correlation_id == correlation_id &&
1613                     aa->sent == 1) {
1614                         /* found it */
1615                         return (aa);
1616                 }
1617         }
1618         /* didn't find it */
1619         return (NULL);
1620 }
1621
1622 /*
1623  * process an SCTP_ERROR_CAUSE_IND for a ASCONF-ACK parameter and do
1624  * notifications based on the error response
1625  */
1626 static void
1627 sctp_asconf_process_error(struct sctp_tcb *stcb,
1628     struct sctp_asconf_paramhdr *aph)
1629 {
1630         struct sctp_error_cause *eh;
1631         struct sctp_paramhdr *ph;
1632         uint16_t param_type;
1633         uint16_t error_code;
1634
1635         eh = (struct sctp_error_cause *)(aph + 1);
1636         ph = (struct sctp_paramhdr *)(eh + 1);
1637         /* validate lengths */
1638         if (htons(eh->length) + sizeof(struct sctp_error_cause) >
1639             htons(aph->ph.param_length)) {
1640                 /* invalid error cause length */
1641                 SCTPDBG(SCTP_DEBUG_ASCONF1,
1642                     "asconf_process_error: cause element too long\n");
1643                 return;
1644         }
1645         if (htons(ph->param_length) + sizeof(struct sctp_paramhdr) >
1646             htons(eh->length)) {
1647                 /* invalid included TLV length */
1648                 SCTPDBG(SCTP_DEBUG_ASCONF1,
1649                     "asconf_process_error: included TLV too long\n");
1650                 return;
1651         }
1652         /* which error code ? */
1653         error_code = ntohs(eh->code);
1654         param_type = ntohs(aph->ph.param_type);
1655         /* FIX: this should go back up the REMOTE_ERROR ULP notify */
1656         switch (error_code) {
1657         case SCTP_CAUSE_RESOURCE_SHORTAGE:
1658                 /* we allow ourselves to "try again" for this error */
1659                 break;
1660         default:
1661                 /* peer can't handle it... */
1662                 switch (param_type) {
1663                 case SCTP_ADD_IP_ADDRESS:
1664                 case SCTP_DEL_IP_ADDRESS:
1665                         stcb->asoc.peer_supports_asconf = 0;
1666                         break;
1667                 case SCTP_SET_PRIM_ADDR:
1668                         stcb->asoc.peer_supports_asconf = 0;
1669                         break;
1670                 default:
1671                         break;
1672                 }
1673         }
1674 }
1675
1676 /*
1677  * process an asconf queue param.
1678  * aparam: parameter to process, will be removed from the queue.
1679  * flag: 1=success case, 0=failure case
1680  */
1681 static void
1682 sctp_asconf_process_param_ack(struct sctp_tcb *stcb,
1683     struct sctp_asconf_addr *aparam, uint32_t flag)
1684 {
1685         uint16_t param_type;
1686
1687         /* process this param */
1688         param_type = aparam->ap.aph.ph.param_type;
1689         switch (param_type) {
1690         case SCTP_ADD_IP_ADDRESS:
1691                 SCTPDBG(SCTP_DEBUG_ASCONF1,
1692                     "process_param_ack: added IP address\n");
1693                 sctp_asconf_addr_mgmt_ack(stcb, aparam->ifa, param_type, flag);
1694                 break;
1695         case SCTP_DEL_IP_ADDRESS:
1696                 SCTPDBG(SCTP_DEBUG_ASCONF1,
1697                     "process_param_ack: deleted IP address\n");
1698                 /* nothing really to do... lists already updated */
1699                 break;
1700         case SCTP_SET_PRIM_ADDR:
1701                 SCTPDBG(SCTP_DEBUG_ASCONF1,
1702                     "process_param_ack: set primary IP address\n");
1703                 /* nothing to do... peer may start using this addr */
1704                 if (flag == 0)
1705                         stcb->asoc.peer_supports_asconf = 0;
1706                 break;
1707         default:
1708                 /* should NEVER happen */
1709                 break;
1710         }
1711
1712         /* remove the param and free it */
1713         TAILQ_REMOVE(&stcb->asoc.asconf_queue, aparam, next);
1714         if (aparam->ifa)
1715                 sctp_free_ifa(aparam->ifa);
1716         SCTP_FREE(aparam, SCTP_M_ASC_ADDR);
1717 }
1718
1719 /*
1720  * cleanup from a bad asconf ack parameter
1721  */
1722 static void
1723 sctp_asconf_ack_clear(struct sctp_tcb *stcb)
1724 {
1725         /* assume peer doesn't really know how to do asconfs */
1726         stcb->asoc.peer_supports_asconf = 0;
1727         /* XXX we could free the pending queue here */
1728 }
1729
1730 void
1731 sctp_handle_asconf_ack(struct mbuf *m, int offset,
1732     struct sctp_asconf_ack_chunk *cp, struct sctp_tcb *stcb,
1733     struct sctp_nets *net, int *abort_no_unlock)
1734 {
1735         struct sctp_association *asoc;
1736         uint32_t serial_num;
1737         uint16_t ack_length;
1738         struct sctp_asconf_paramhdr *aph;
1739         struct sctp_asconf_addr *aa, *aa_next;
1740         uint32_t last_error_id = 0;     /* last error correlation id */
1741         uint32_t id;
1742         struct sctp_asconf_addr *ap;
1743
1744         /* asconf param buffer */
1745         uint8_t aparam_buf[SCTP_PARAM_BUFFER_SIZE];
1746
1747         /* verify minimum length */
1748         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_asconf_ack_chunk)) {
1749                 SCTPDBG(SCTP_DEBUG_ASCONF1,
1750                     "handle_asconf_ack: chunk too small = %xh\n",
1751                     ntohs(cp->ch.chunk_length));
1752                 return;
1753         }
1754         asoc = &stcb->asoc;
1755         serial_num = ntohl(cp->serial_number);
1756
1757         /*
1758          * NOTE: we may want to handle this differently- currently, we will
1759          * abort when we get an ack for the expected serial number + 1 (eg.
1760          * we didn't send it), process an ack normally if it is the expected
1761          * serial number, and re-send the previous ack for *ALL* other
1762          * serial numbers
1763          */
1764
1765         /*
1766          * if the serial number is the next expected, but I didn't send it,
1767          * abort the asoc, since someone probably just hijacked us...
1768          */
1769         if (serial_num == (asoc->asconf_seq_out + 1)) {
1770                 SCTPDBG(SCTP_DEBUG_ASCONF1, "handle_asconf_ack: got unexpected next serial number! Aborting asoc!\n");
1771                 sctp_abort_an_association(stcb->sctp_ep, stcb,
1772                     SCTP_CAUSE_ILLEGAL_ASCONF_ACK, NULL, SCTP_SO_NOT_LOCKED);
1773                 *abort_no_unlock = 1;
1774                 return;
1775         }
1776         if (serial_num != asoc->asconf_seq_out_acked + 1) {
1777                 /* got a duplicate/unexpected ASCONF-ACK */
1778                 SCTPDBG(SCTP_DEBUG_ASCONF1, "handle_asconf_ack: got duplicate/unexpected serial number = %xh (expected = %xh)\n",
1779                     serial_num, asoc->asconf_seq_out_acked + 1);
1780                 return;
1781         }
1782         if (serial_num == asoc->asconf_seq_out - 1) {
1783                 /* stop our timer */
1784                 sctp_timer_stop(SCTP_TIMER_TYPE_ASCONF, stcb->sctp_ep, stcb, net,
1785                     SCTP_FROM_SCTP_ASCONF + SCTP_LOC_3);
1786         }
1787         /* process the ASCONF-ACK contents */
1788         ack_length = ntohs(cp->ch.chunk_length) -
1789             sizeof(struct sctp_asconf_ack_chunk);
1790         offset += sizeof(struct sctp_asconf_ack_chunk);
1791         /* process through all parameters */
1792         while (ack_length >= sizeof(struct sctp_asconf_paramhdr)) {
1793                 unsigned int param_length, param_type;
1794
1795                 /* get pointer to next asconf parameter */
1796                 aph = (struct sctp_asconf_paramhdr *)sctp_m_getptr(m, offset,
1797                     sizeof(struct sctp_asconf_paramhdr), aparam_buf);
1798                 if (aph == NULL) {
1799                         /* can't get an asconf paramhdr */
1800                         sctp_asconf_ack_clear(stcb);
1801                         return;
1802                 }
1803                 param_type = ntohs(aph->ph.param_type);
1804                 param_length = ntohs(aph->ph.param_length);
1805                 if (param_length > ack_length) {
1806                         sctp_asconf_ack_clear(stcb);
1807                         return;
1808                 }
1809                 if (param_length < sizeof(struct sctp_paramhdr)) {
1810                         sctp_asconf_ack_clear(stcb);
1811                         return;
1812                 }
1813                 /* get the complete parameter... */
1814                 if (param_length > sizeof(aparam_buf)) {
1815                         SCTPDBG(SCTP_DEBUG_ASCONF1,
1816                             "param length (%u) larger than buffer size!\n", param_length);
1817                         sctp_asconf_ack_clear(stcb);
1818                         return;
1819                 }
1820                 aph = (struct sctp_asconf_paramhdr *)sctp_m_getptr(m, offset, param_length, aparam_buf);
1821                 if (aph == NULL) {
1822                         sctp_asconf_ack_clear(stcb);
1823                         return;
1824                 }
1825                 /* correlation_id is transparent to peer, no ntohl needed */
1826                 id = aph->correlation_id;
1827
1828                 switch (param_type) {
1829                 case SCTP_ERROR_CAUSE_IND:
1830                         last_error_id = id;
1831                         /* find the corresponding asconf param in our queue */
1832                         ap = sctp_asconf_find_param(stcb, id);
1833                         if (ap == NULL) {
1834                                 /* hmm... can't find this in our queue! */
1835                                 break;
1836                         }
1837                         /* process the parameter, failed flag */
1838                         sctp_asconf_process_param_ack(stcb, ap, 0);
1839                         /* process the error response */
1840                         sctp_asconf_process_error(stcb, aph);
1841                         break;
1842                 case SCTP_SUCCESS_REPORT:
1843                         /* find the corresponding asconf param in our queue */
1844                         ap = sctp_asconf_find_param(stcb, id);
1845                         if (ap == NULL) {
1846                                 /* hmm... can't find this in our queue! */
1847                                 break;
1848                         }
1849                         /* process the parameter, success flag */
1850                         sctp_asconf_process_param_ack(stcb, ap, 1);
1851                         break;
1852                 default:
1853                         break;
1854                 }               /* switch */
1855
1856                 /* update remaining ASCONF-ACK message length to process */
1857                 ack_length -= SCTP_SIZE32(param_length);
1858                 if (ack_length <= 0) {
1859                         /* no more data in the mbuf chain */
1860                         break;
1861                 }
1862                 offset += SCTP_SIZE32(param_length);
1863         }                       /* while */
1864
1865         /*
1866          * if there are any "sent" params still on the queue, these are
1867          * implicitly "success", or "failed" (if we got an error back) ...
1868          * so process these appropriately
1869          *
1870          * we assume that the correlation_id's are monotonically increasing
1871          * beginning from 1 and that we don't have *that* many outstanding
1872          * at any given time
1873          */
1874         if (last_error_id == 0)
1875                 last_error_id--;/* set to "max" value */
1876         for (aa = TAILQ_FIRST(&stcb->asoc.asconf_queue); aa != NULL;
1877             aa = aa_next) {
1878                 aa_next = TAILQ_NEXT(aa, next);
1879                 if (aa->sent == 1) {
1880                         /*
1881                          * implicitly successful or failed if correlation_id
1882                          * < last_error_id, then success else, failure
1883                          */
1884                         if (aa->ap.aph.correlation_id < last_error_id)
1885                                 sctp_asconf_process_param_ack(stcb, aa, 1);
1886                         else
1887                                 sctp_asconf_process_param_ack(stcb, aa, 0);
1888                 } else {
1889                         /*
1890                          * since we always process in order (FIFO queue) if
1891                          * we reach one that hasn't been sent, the rest
1892                          * should not have been sent either. so, we're
1893                          * done...
1894                          */
1895                         break;
1896                 }
1897         }
1898
1899         /* update the next sequence number to use */
1900         asoc->asconf_seq_out_acked++;
1901         /* remove the old ASCONF on our outbound queue */
1902         sctp_toss_old_asconf(stcb);
1903         if (!TAILQ_EMPTY(&stcb->asoc.asconf_queue)) {
1904 #ifdef SCTP_TIMER_BASED_ASCONF
1905                 /* we have more params, so restart our timer */
1906                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, stcb->sctp_ep,
1907                     stcb, net);
1908 #else
1909                 /* we have more params, so send out more */
1910                 sctp_send_asconf(stcb, net, SCTP_ADDR_NOT_LOCKED);
1911 #endif
1912         }
1913 }
1914
1915 #ifdef INET6
1916 static uint32_t
1917 sctp_is_scopeid_in_nets(struct sctp_tcb *stcb, struct sockaddr *sa)
1918 {
1919         struct sockaddr_in6 *sin6, *net6;
1920         struct sctp_nets *net;
1921
1922         if (sa->sa_family != AF_INET6) {
1923                 /* wrong family */
1924                 return (0);
1925         }
1926         sin6 = (struct sockaddr_in6 *)sa;
1927         if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) == 0) {
1928                 /* not link local address */
1929                 return (0);
1930         }
1931         /* hunt through our destination nets list for this scope_id */
1932         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1933                 if (((struct sockaddr *)(&net->ro._l_addr))->sa_family !=
1934                     AF_INET6)
1935                         continue;
1936                 net6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1937                 if (IN6_IS_ADDR_LINKLOCAL(&net6->sin6_addr) == 0)
1938                         continue;
1939                 if (sctp_is_same_scope(sin6, net6)) {
1940                         /* found one */
1941                         return (1);
1942                 }
1943         }
1944         /* didn't find one */
1945         return (0);
1946 }
1947
1948 #endif
1949
1950 /*
1951  * address management functions
1952  */
1953 static void
1954 sctp_addr_mgmt_assoc(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1955     struct sctp_ifa *ifa, uint16_t type, int addr_locked)
1956 {
1957         int status;
1958
1959
1960         if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) == 0 &&
1961             sctp_is_feature_off(inp, SCTP_PCB_FLAGS_DO_ASCONF)) {
1962                 /* subset bound, no ASCONF allowed case, so ignore */
1963                 return;
1964         }
1965         /*
1966          * note: we know this is not the subset bound, no ASCONF case eg.
1967          * this is boundall or subset bound w/ASCONF allowed
1968          */
1969
1970         /* first, make sure it's a good address family */
1971         if (ifa->address.sa.sa_family != AF_INET6 &&
1972             ifa->address.sa.sa_family != AF_INET) {
1973                 return;
1974         }
1975         /* make sure we're "allowed" to add this type of addr */
1976         if (ifa->address.sa.sa_family == AF_INET6) {
1977                 /* invalid if we're not a v6 endpoint */
1978                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0)
1979                         return;
1980                 /* is the v6 addr really valid ? */
1981                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1982                         return;
1983                 }
1984         }
1985         /* put this address on the "pending/do not use yet" list */
1986         sctp_add_local_addr_restricted(stcb, ifa);
1987         /*
1988          * check address scope if address is out of scope, don't queue
1989          * anything... note: this would leave the address on both inp and
1990          * asoc lists
1991          */
1992         switch (ifa->address.sa.sa_family) {
1993 #ifdef INET6
1994         case AF_INET6:
1995                 {
1996                         struct sockaddr_in6 *sin6;
1997
1998                         sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
1999                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
2000                                 /* we skip unspecifed addresses */
2001                                 return;
2002                         }
2003                         if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
2004                                 if (stcb->asoc.local_scope == 0) {
2005                                         return;
2006                                 }
2007                                 /* is it the right link local scope? */
2008                                 if (sctp_is_scopeid_in_nets(stcb, &ifa->address.sa) == 0) {
2009                                         return;
2010                                 }
2011                         }
2012                         if (stcb->asoc.site_scope == 0 &&
2013                             IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) {
2014                                 return;
2015                         }
2016                         break;
2017                 }
2018 #endif
2019         case AF_INET:
2020                 {
2021                         struct sockaddr_in *sin;
2022                         struct in6pcb *inp6;
2023
2024                         inp6 = (struct in6pcb *)&inp->ip_inp.inp;
2025                         /* invalid if we are a v6 only endpoint */
2026                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) &&
2027                             SCTP_IPV6_V6ONLY(inp6))
2028                                 return;
2029
2030                         sin = (struct sockaddr_in *)&ifa->address.sa;
2031                         if (sin->sin_addr.s_addr == 0) {
2032                                 /* we skip unspecifed addresses */
2033                                 return;
2034                         }
2035                         if (stcb->asoc.ipv4_local_scope == 0 &&
2036                             IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) {
2037                                 return;
2038                         }
2039                         break;
2040                 }
2041         default:
2042                 /* else, not AF_INET or AF_INET6, so skip */
2043                 return;
2044         }
2045
2046         /* queue an asconf for this address add/delete */
2047         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_DO_ASCONF)) {
2048                 /* does the peer do asconf? */
2049                 if (stcb->asoc.peer_supports_asconf) {
2050                         /* queue an asconf for this addr */
2051                         status = sctp_asconf_queue_add(stcb, ifa, type);
2052
2053                         /*
2054                          * if queued ok, and in the open state, send out the
2055                          * ASCONF.  If in the non-open state, these will be
2056                          * sent when the state goes open.
2057                          */
2058                         if (status == 0 &&
2059                             SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
2060 #ifdef SCTP_TIMER_BASED_ASCONF
2061                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
2062                                     stcb, stcb->asoc.primary_destination);
2063 #else
2064                                 sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2065                                     addr_locked);
2066 #endif
2067                         }
2068                 }
2069         }
2070 }
2071
2072
2073 int
2074 sctp_asconf_iterator_ep(struct sctp_inpcb *inp, void *ptr, uint32_t val)
2075 {
2076         struct sctp_asconf_iterator *asc;
2077         struct sctp_ifa *ifa;
2078         struct sctp_laddr *l;
2079         int type;
2080         int cnt_invalid = 0;
2081
2082         asc = (struct sctp_asconf_iterator *)ptr;
2083         LIST_FOREACH(l, &asc->list_of_work, sctp_nxt_addr) {
2084                 ifa = l->ifa;
2085                 type = l->action;
2086                 if (ifa->address.sa.sa_family == AF_INET6) {
2087                         /* invalid if we're not a v6 endpoint */
2088                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) {
2089                                 cnt_invalid++;
2090                                 if (asc->cnt == cnt_invalid)
2091                                         return (1);
2092                                 else
2093                                         continue;
2094                         }
2095                 } else if (ifa->address.sa.sa_family == AF_INET) {
2096                         /* invalid if we are a v6 only endpoint */
2097                         struct in6pcb *inp6;
2098
2099                         inp6 = (struct in6pcb *)&inp->ip_inp.inp;
2100                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) &&
2101                             SCTP_IPV6_V6ONLY(inp6)) {
2102                                 cnt_invalid++;
2103                                 if (asc->cnt == cnt_invalid)
2104                                         return (1);
2105                                 else
2106                                         continue;
2107                         }
2108                 } else {
2109                         /* invalid address family */
2110                         cnt_invalid++;
2111                         if (asc->cnt == cnt_invalid)
2112                                 return (1);
2113                         else
2114                                 continue;
2115                 }
2116         }
2117         return (0);
2118 }
2119
2120 static int
2121 sctp_asconf_iterator_ep_end(struct sctp_inpcb *inp, void *ptr, uint32_t val)
2122 {
2123         struct sctp_ifa *ifa;
2124         struct sctp_asconf_iterator *asc;
2125         struct sctp_laddr *laddr, *nladdr, *l;
2126
2127         /* Only for specific case not bound all */
2128         asc = (struct sctp_asconf_iterator *)ptr;
2129         LIST_FOREACH(l, &asc->list_of_work, sctp_nxt_addr) {
2130                 ifa = l->ifa;
2131                 if (l->action == SCTP_ADD_IP_ADDRESS) {
2132                         LIST_FOREACH(laddr, &inp->sctp_addr_list,
2133                             sctp_nxt_addr) {
2134                                 if (laddr->ifa == ifa) {
2135                                         laddr->action = 0;
2136                                         break;
2137                                 }
2138                         }
2139                 } else if (l->action == SCTP_DEL_IP_ADDRESS) {
2140                         laddr = LIST_FIRST(&inp->sctp_addr_list);
2141                         while (laddr) {
2142                                 nladdr = LIST_NEXT(laddr, sctp_nxt_addr);
2143                                 /* remove only after all guys are done */
2144                                 if (laddr->ifa == ifa) {
2145                                         sctp_del_local_addr_ep(inp, ifa);
2146                                 }
2147                                 laddr = nladdr;
2148                         }
2149                 }
2150         }
2151         return (0);
2152 }
2153
2154 void
2155 sctp_asconf_iterator_stcb(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2156     void *ptr, uint32_t val)
2157 {
2158         struct sctp_asconf_iterator *asc;
2159         struct sctp_ifa *ifa;
2160         struct sctp_laddr *l;
2161         int cnt_invalid = 0;
2162         int type, status;
2163         int num_queued = 0;
2164
2165         asc = (struct sctp_asconf_iterator *)ptr;
2166         LIST_FOREACH(l, &asc->list_of_work, sctp_nxt_addr) {
2167                 ifa = l->ifa;
2168                 type = l->action;
2169
2170                 /* address's vrf_id must be the vrf_id of the assoc */
2171                 if (ifa->vrf_id != stcb->asoc.vrf_id) {
2172                         continue;
2173                 }
2174                 /* Same checks again for assoc */
2175                 switch (ifa->address.sa.sa_family) {
2176 #ifdef INET6
2177                 case AF_INET6:
2178                         {
2179                                 /* invalid if we're not a v6 endpoint */
2180                                 struct sockaddr_in6 *sin6;
2181
2182                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) {
2183                                         cnt_invalid++;
2184                                         if (asc->cnt == cnt_invalid)
2185                                                 return;
2186                                         else
2187                                                 continue;
2188                                 }
2189                                 sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
2190                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
2191                                         /* we skip unspecifed addresses */
2192                                         continue;
2193                                 }
2194                                 if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
2195                                         if (stcb->asoc.local_scope == 0) {
2196                                                 continue;
2197                                         }
2198                                         /* is it the right link local scope? */
2199                                         if (sctp_is_scopeid_in_nets(stcb, &ifa->address.sa) == 0) {
2200                                                 continue;
2201                                         }
2202                                 }
2203                                 break;
2204                         }
2205 #endif
2206                 case AF_INET:
2207                         {
2208                                 /* invalid if we are a v6 only endpoint */
2209                                 struct in6pcb *inp6;
2210                                 struct sockaddr_in *sin;
2211
2212                                 inp6 = (struct in6pcb *)&inp->ip_inp.inp;
2213                                 /* invalid if we are a v6 only endpoint */
2214                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) &&
2215                                     SCTP_IPV6_V6ONLY(inp6))
2216                                         continue;
2217
2218                                 sin = (struct sockaddr_in *)&ifa->address.sa;
2219                                 if (sin->sin_addr.s_addr == 0) {
2220                                         /* we skip unspecifed addresses */
2221                                         continue;
2222                                 }
2223                                 if (stcb->asoc.ipv4_local_scope == 0 &&
2224                                     IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) {
2225                                         continue;;
2226                                 }
2227                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) &&
2228                                     SCTP_IPV6_V6ONLY(inp6)) {
2229                                         cnt_invalid++;
2230                                         if (asc->cnt == cnt_invalid)
2231                                                 return;
2232                                         else
2233                                                 continue;
2234                                 }
2235                                 break;
2236                         }
2237                 default:
2238                         /* invalid address family */
2239                         cnt_invalid++;
2240                         if (asc->cnt == cnt_invalid)
2241                                 return;
2242                         else
2243                                 continue;
2244                         break;
2245                 }
2246
2247                 if (type == SCTP_ADD_IP_ADDRESS) {
2248                         /* prevent this address from being used as a source */
2249                         sctp_add_local_addr_restricted(stcb, ifa);
2250                 } else if (type == SCTP_DEL_IP_ADDRESS) {
2251                         struct sctp_nets *net;
2252
2253                         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
2254                                 sctp_rtentry_t *rt;
2255
2256                                 /* delete this address if cached */
2257                                 if (net->ro._s_addr == ifa) {
2258                                         sctp_free_ifa(net->ro._s_addr);
2259                                         net->ro._s_addr = NULL;
2260                                         net->src_addr_selected = 0;
2261                                         rt = net->ro.ro_rt;
2262                                         if (rt) {
2263                                                 RTFREE(rt);
2264                                                 net->ro.ro_rt = NULL;
2265                                         }
2266                                         /*
2267                                          * Now we deleted our src address,
2268                                          * should we not also now reset the
2269                                          * cwnd/rto to start as if its a new
2270                                          * address?
2271                                          */
2272                                         stcb->asoc.cc_functions.sctp_set_initial_cc_param(stcb, net);
2273                                         net->RTO = 0;
2274
2275                                 }
2276                         }
2277                 } else if (type == SCTP_SET_PRIM_ADDR) {
2278                         if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) == 0) {
2279                                 /* must validate the ifa is in the ep */
2280                                 if (sctp_is_addr_in_ep(stcb->sctp_ep, ifa) == 0) {
2281                                         continue;
2282                                 }
2283                         } else {
2284                                 /* Need to check scopes for this guy */
2285                                 if (sctp_is_address_in_scope(ifa,
2286                                     stcb->asoc.ipv4_addr_legal,
2287                                     stcb->asoc.ipv6_addr_legal,
2288                                     stcb->asoc.loopback_scope,
2289                                     stcb->asoc.ipv4_local_scope,
2290                                     stcb->asoc.local_scope,
2291                                     stcb->asoc.site_scope, 0) == 0) {
2292                                         continue;
2293                                 }
2294                         }
2295                 }
2296                 /* queue an asconf for this address add/delete */
2297                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_DO_ASCONF) &&
2298                     stcb->asoc.peer_supports_asconf) {
2299                         /* queue an asconf for this addr */
2300                         status = sctp_asconf_queue_add(stcb, ifa, type);
2301                         /*
2302                          * if queued ok, and in the open state, update the
2303                          * count of queued params.  If in the non-open
2304                          * state, these get sent when the assoc goes open.
2305                          */
2306                         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
2307                                 if (status >= 0) {
2308                                         num_queued++;
2309                                 }
2310                         }
2311                 }
2312         }
2313         /*
2314          * If we have queued params in the open state, send out an ASCONF.
2315          */
2316         if (num_queued > 0) {
2317                 sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2318                     SCTP_ADDR_NOT_LOCKED);
2319         }
2320 }
2321
2322 void
2323 sctp_asconf_iterator_end(void *ptr, uint32_t val)
2324 {
2325         struct sctp_asconf_iterator *asc;
2326         struct sctp_ifa *ifa;
2327         struct sctp_laddr *l, *l_next;
2328
2329         asc = (struct sctp_asconf_iterator *)ptr;
2330         l = LIST_FIRST(&asc->list_of_work);
2331         while (l != NULL) {
2332                 l_next = LIST_NEXT(l, sctp_nxt_addr);
2333                 ifa = l->ifa;
2334                 if (l->action == SCTP_ADD_IP_ADDRESS) {
2335                         /* Clear the defer use flag */
2336                         ifa->localifa_flags &= ~SCTP_ADDR_DEFER_USE;
2337                 }
2338                 sctp_free_ifa(ifa);
2339                 SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_laddr, l);
2340                 SCTP_DECR_LADDR_COUNT();
2341                 l = l_next;
2342         }
2343         SCTP_FREE(asc, SCTP_M_ASC_IT);
2344 }
2345
2346 /*
2347  * sa is the sockaddr to ask the peer to set primary to.
2348  * returns: 0 = completed, -1 = error
2349  */
2350 int32_t
2351 sctp_set_primary_ip_address_sa(struct sctp_tcb *stcb, struct sockaddr *sa)
2352 {
2353         uint32_t vrf_id;
2354         struct sctp_ifa *ifa;
2355
2356         /* find the ifa for the desired set primary */
2357         vrf_id = stcb->asoc.vrf_id;
2358         ifa = sctp_find_ifa_by_addr(sa, vrf_id, SCTP_ADDR_NOT_LOCKED);
2359         if (ifa == NULL) {
2360                 /* Invalid address */
2361                 return (-1);
2362         }
2363         /* queue an ASCONF:SET_PRIM_ADDR to be sent */
2364         if (!sctp_asconf_queue_add(stcb, ifa, SCTP_SET_PRIM_ADDR)) {
2365                 /* set primary queuing succeeded */
2366                 SCTPDBG(SCTP_DEBUG_ASCONF1,
2367                     "set_primary_ip_address_sa: queued on tcb=%p, ",
2368                     stcb);
2369                 SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, sa);
2370                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
2371 #ifdef SCTP_TIMER_BASED_ASCONF
2372                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2373                             stcb->sctp_ep, stcb,
2374                             stcb->asoc.primary_destination);
2375 #else
2376                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2377                             SCTP_ADDR_NOT_LOCKED);
2378 #endif
2379                 }
2380         } else {
2381                 SCTPDBG(SCTP_DEBUG_ASCONF1, "set_primary_ip_address_sa: failed to add to queue on tcb=%p, ",
2382                     stcb);
2383                 SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, sa);
2384                 return (-1);
2385         }
2386         return (0);
2387 }
2388
2389 void
2390 sctp_set_primary_ip_address(struct sctp_ifa *ifa)
2391 {
2392         struct sctp_inpcb *inp;
2393
2394         /* go through all our PCB's */
2395         LIST_FOREACH(inp, &sctppcbinfo.listhead, sctp_list) {
2396                 struct sctp_tcb *stcb;
2397
2398                 /* process for all associations for this endpoint */
2399                 LIST_FOREACH(stcb, &inp->sctp_asoc_list, sctp_tcblist) {
2400                         /* queue an ASCONF:SET_PRIM_ADDR to be sent */
2401                         if (!sctp_asconf_queue_add(stcb, ifa,
2402                             SCTP_SET_PRIM_ADDR)) {
2403                                 /* set primary queuing succeeded */
2404                                 SCTPDBG(SCTP_DEBUG_ASCONF1, "set_primary_ip_address: queued on stcb=%p, ",
2405                                     stcb);
2406                                 SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, &ifa->address.sa);
2407                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
2408 #ifdef SCTP_TIMER_BASED_ASCONF
2409                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2410                                             stcb->sctp_ep, stcb,
2411                                             stcb->asoc.primary_destination);
2412 #else
2413                                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2414                                             SCTP_ADDR_NOT_LOCKED);
2415 #endif
2416                                 }
2417                         }
2418                 }               /* for each stcb */
2419         }                       /* for each inp */
2420 }
2421
2422 int
2423 sctp_is_addr_pending(struct sctp_tcb *stcb, struct sctp_ifa *sctp_ifa)
2424 {
2425         struct sctp_tmit_chunk *chk, *nchk;
2426         unsigned int offset, asconf_limit;
2427         struct sctp_asconf_chunk *acp;
2428         struct sctp_asconf_paramhdr *aph;
2429         uint8_t aparam_buf[SCTP_PARAM_BUFFER_SIZE];
2430         struct sctp_ipv6addr_param *p_addr;
2431         int add_cnt, del_cnt;
2432         uint16_t last_param_type;
2433
2434         add_cnt = del_cnt = 0;
2435         last_param_type = 0;
2436         for (chk = TAILQ_FIRST(&stcb->asoc.asconf_send_queue); chk != NULL;
2437             chk = nchk) {
2438                 /* get next chk */
2439                 nchk = TAILQ_NEXT(chk, sctp_next);
2440
2441                 if (chk->data == NULL) {
2442                         SCTPDBG(SCTP_DEBUG_ASCONF1, "is_addr_pending: No mbuf data?\n");
2443                         continue;
2444                 }
2445                 offset = 0;
2446                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
2447                 offset += sizeof(struct sctp_asconf_chunk);
2448                 asconf_limit = ntohs(acp->ch.chunk_length);
2449                 p_addr = (struct sctp_ipv6addr_param *)sctp_m_getptr(chk->data, offset, sizeof(struct sctp_paramhdr), aparam_buf);
2450                 if (p_addr == NULL) {
2451                         SCTPDBG(SCTP_DEBUG_ASCONF1, "is_addr_pending: couldn't get lookup addr!\n");
2452                         continue;
2453                 }
2454                 offset += ntohs(p_addr->ph.param_length);
2455
2456                 aph = (struct sctp_asconf_paramhdr *)sctp_m_getptr(chk->data, offset, sizeof(struct sctp_asconf_paramhdr), aparam_buf);
2457                 if (aph == NULL) {
2458                         SCTPDBG(SCTP_DEBUG_ASCONF1, "is_addr_pending: Empty ASCONF will be sent?\n");
2459                         continue;
2460                 }
2461                 while (aph != NULL) {
2462                         unsigned int param_length, param_type;
2463
2464                         param_type = ntohs(aph->ph.param_type);
2465                         param_length = ntohs(aph->ph.param_length);
2466                         if (offset + param_length > asconf_limit) {
2467                                 /* parameter goes beyond end of chunk! */
2468                                 break;
2469                         }
2470                         if (param_length > sizeof(aparam_buf)) {
2471                                 SCTPDBG(SCTP_DEBUG_ASCONF1, "is_addr_pending: param length (%u) larger than buffer size!\n", param_length);
2472                                 break;
2473                         }
2474                         if (param_length <= sizeof(struct sctp_paramhdr)) {
2475                                 SCTPDBG(SCTP_DEBUG_ASCONF1, "is_addr_pending: param length(%u) too short\n", param_length);
2476                                 break;
2477                         }
2478                         aph = (struct sctp_asconf_paramhdr *)sctp_m_getptr(chk->data, offset, param_length, aparam_buf);
2479                         if (aph == NULL) {
2480                                 SCTPDBG(SCTP_DEBUG_ASCONF1, "is_addr_pending: couldn't get entire param\n");
2481                                 break;
2482                         }
2483                         p_addr = (struct sctp_ipv6addr_param *)(aph + 1);
2484                         if (sctp_addr_match(p_addr, &sctp_ifa->address.sa) != 0) {
2485                                 switch (param_type) {
2486                                 case SCTP_ADD_IP_ADDRESS:
2487                                         add_cnt++;
2488                                         break;
2489                                 case SCTP_DEL_IP_ADDRESS:
2490                                         del_cnt++;
2491                                         break;
2492                                 default:
2493                                         break;
2494                                 }
2495                                 last_param_type = param_type;
2496                         }
2497                         offset += SCTP_SIZE32(param_length);
2498                         if (offset >= asconf_limit) {
2499                                 /* no more data in the mbuf chain */
2500                                 break;
2501                         }
2502                         /* get pointer to next asconf param */
2503                         aph = (struct sctp_asconf_paramhdr *)sctp_m_getptr(chk->data, offset, sizeof(struct sctp_asconf_paramhdr), aparam_buf);
2504                 }
2505         }
2506
2507         /*
2508          * we want to find the sequences which consist of ADD -> DEL -> ADD
2509          * or DEL -> ADD
2510          */
2511         if (add_cnt > del_cnt ||
2512             (add_cnt == del_cnt && last_param_type == SCTP_ADD_IP_ADDRESS)) {
2513                 return 1;
2514         }
2515         return 0;
2516 }
2517
2518 static struct sockaddr *
2519 sctp_find_valid_localaddr(struct sctp_tcb *stcb, int addr_locked)
2520 {
2521         struct sctp_vrf *vrf = NULL;
2522         struct sctp_ifn *sctp_ifn;
2523         struct sctp_ifa *sctp_ifa;
2524
2525         if (addr_locked == SCTP_ADDR_NOT_LOCKED)
2526                 SCTP_IPI_ADDR_RLOCK();
2527         vrf = sctp_find_vrf(stcb->asoc.vrf_id);
2528         if (vrf == NULL) {
2529                 if (addr_locked == SCTP_ADDR_NOT_LOCKED)
2530                         SCTP_IPI_ADDR_RUNLOCK();
2531                 return (NULL);
2532         }
2533         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
2534                 if (stcb->asoc.loopback_scope == 0 &&
2535                     SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
2536                         /* Skip if loopback_scope not set */
2537                         continue;
2538                 }
2539                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2540                         if (sctp_ifa->address.sa.sa_family == AF_INET &&
2541                             stcb->asoc.ipv4_addr_legal) {
2542                                 struct sockaddr_in *sin;
2543
2544                                 sin = (struct sockaddr_in *)&sctp_ifa->address.sa;
2545                                 if (sin->sin_addr.s_addr == 0) {
2546                                         /* skip unspecifed addresses */
2547                                         continue;
2548                                 }
2549                                 if (stcb->asoc.ipv4_local_scope == 0 &&
2550                                     IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))
2551                                         continue;
2552
2553                                 if (sctp_is_addr_restricted(stcb, sctp_ifa) &&
2554                                     (!sctp_is_addr_pending(stcb, sctp_ifa)))
2555                                         continue;
2556                                 /* found a valid local v4 address to use */
2557                                 if (addr_locked == SCTP_ADDR_NOT_LOCKED)
2558                                         SCTP_IPI_ADDR_RUNLOCK();
2559                                 return (&sctp_ifa->address.sa);
2560                         } else if (sctp_ifa->address.sa.sa_family == AF_INET6 &&
2561                             stcb->asoc.ipv6_addr_legal) {
2562                                 struct sockaddr_in6 *sin6;
2563
2564                                 if (sctp_ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2565                                         continue;
2566                                 }
2567                                 sin6 = (struct sockaddr_in6 *)&sctp_ifa->address.sa;
2568                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
2569                                         /* we skip unspecifed addresses */
2570                                         continue;
2571                                 }
2572                                 if (stcb->asoc.local_scope == 0 &&
2573                                     IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
2574                                         continue;
2575                                 if (stcb->asoc.site_scope == 0 &&
2576                                     IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))
2577                                         continue;
2578
2579                                 if (sctp_is_addr_restricted(stcb, sctp_ifa) &&
2580                                     (!sctp_is_addr_pending(stcb, sctp_ifa)))
2581                                         continue;
2582                                 /* found a valid local v6 address to use */
2583                                 if (addr_locked == SCTP_ADDR_NOT_LOCKED)
2584                                         SCTP_IPI_ADDR_RUNLOCK();
2585                                 return (&sctp_ifa->address.sa);
2586                         }
2587                 }
2588         }
2589         /* no valid addresses found */
2590         if (addr_locked == SCTP_ADDR_NOT_LOCKED)
2591                 SCTP_IPI_ADDR_RUNLOCK();
2592         return (NULL);
2593 }
2594
2595 static struct sockaddr *
2596 sctp_find_valid_localaddr_ep(struct sctp_tcb *stcb)
2597 {
2598         struct sctp_laddr *laddr;
2599
2600         LIST_FOREACH(laddr, &stcb->sctp_ep->sctp_addr_list, sctp_nxt_addr) {
2601                 if (laddr->ifa == NULL) {
2602                         continue;
2603                 }
2604                 /* is the address restricted ? */
2605                 if (sctp_is_addr_restricted(stcb, laddr->ifa) &&
2606                     (!sctp_is_addr_pending(stcb, laddr->ifa)))
2607                         continue;
2608
2609                 /* found a valid local address to use */
2610                 return (&laddr->ifa->address.sa);
2611         }
2612         /* no valid addresses found */
2613         return (NULL);
2614 }
2615
2616 /*
2617  * builds an ASCONF chunk from queued ASCONF params.
2618  * returns NULL on error (no mbuf, no ASCONF params queued, etc).
2619  */
2620 struct mbuf *
2621 sctp_compose_asconf(struct sctp_tcb *stcb, int *retlen, int addr_locked)
2622 {
2623         struct mbuf *m_asconf, *m_asconf_chk;
2624         struct sctp_asconf_addr *aa;
2625         struct sctp_asconf_chunk *acp;
2626         struct sctp_asconf_paramhdr *aph;
2627         struct sctp_asconf_addr_param *aap;
2628         uint32_t p_length;
2629         uint32_t correlation_id = 1;    /* 0 is reserved... */
2630         caddr_t ptr, lookup_ptr;
2631         uint8_t lookup_used = 0;
2632
2633         /* are there any asconf params to send? */
2634         TAILQ_FOREACH(aa, &stcb->asoc.asconf_queue, next) {
2635                 if (aa->sent == 0)
2636                         break;
2637         }
2638         if (aa == NULL)
2639                 return (NULL);
2640
2641         /*
2642          * get a chunk header mbuf and a cluster for the asconf params since
2643          * it's simpler to fill in the asconf chunk header lookup address on
2644          * the fly
2645          */
2646         m_asconf_chk = sctp_get_mbuf_for_msg(sizeof(struct sctp_asconf_chunk), 0, M_DONTWAIT, 1, MT_DATA);
2647         if (m_asconf_chk == NULL) {
2648                 /* no mbuf's */
2649                 SCTPDBG(SCTP_DEBUG_ASCONF1,
2650                     "compose_asconf: couldn't get chunk mbuf!\n");
2651                 return (NULL);
2652         }
2653         m_asconf = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
2654         if (m_asconf == NULL) {
2655                 /* no mbuf's */
2656                 SCTPDBG(SCTP_DEBUG_ASCONF1,
2657                     "compose_asconf: couldn't get mbuf!\n");
2658                 sctp_m_freem(m_asconf_chk);
2659                 return (NULL);
2660         }
2661         SCTP_BUF_LEN(m_asconf_chk) = sizeof(struct sctp_asconf_chunk);
2662         SCTP_BUF_LEN(m_asconf) = 0;
2663         acp = mtod(m_asconf_chk, struct sctp_asconf_chunk *);
2664         bzero(acp, sizeof(struct sctp_asconf_chunk));
2665         /* save pointers to lookup address and asconf params */
2666         lookup_ptr = (caddr_t)(acp + 1);        /* after the header */
2667         ptr = mtod(m_asconf, caddr_t);  /* beginning of cluster */
2668
2669         /* fill in chunk header info */
2670         acp->ch.chunk_type = SCTP_ASCONF;
2671         acp->ch.chunk_flags = 0;
2672         acp->serial_number = htonl(stcb->asoc.asconf_seq_out);
2673         stcb->asoc.asconf_seq_out++;
2674
2675         /* add parameters... up to smallest MTU allowed */
2676         TAILQ_FOREACH(aa, &stcb->asoc.asconf_queue, next) {
2677                 if (aa->sent)
2678                         continue;
2679                 /* get the parameter length */
2680                 p_length = SCTP_SIZE32(aa->ap.aph.ph.param_length);
2681                 /* will it fit in current chunk? */
2682                 if (SCTP_BUF_LEN(m_asconf) + p_length > stcb->asoc.smallest_mtu) {
2683                         /* won't fit, so we're done with this chunk */
2684                         break;
2685                 }
2686                 /* assign (and store) a correlation id */
2687                 aa->ap.aph.correlation_id = correlation_id++;
2688
2689                 /*
2690                  * fill in address if we're doing a delete this is a simple
2691                  * way for us to fill in the correlation address, which
2692                  * should only be used by the peer if we're deleting our
2693                  * source address and adding a new address (e.g. renumbering
2694                  * case)
2695                  */
2696                 if (lookup_used == 0 &&
2697                     aa->ap.aph.ph.param_type == SCTP_DEL_IP_ADDRESS) {
2698                         struct sctp_ipv6addr_param *lookup;
2699                         uint16_t p_size, addr_size;
2700
2701                         lookup = (struct sctp_ipv6addr_param *)lookup_ptr;
2702                         lookup->ph.param_type =
2703                             htons(aa->ap.addrp.ph.param_type);
2704                         if (aa->ap.addrp.ph.param_type == SCTP_IPV6_ADDRESS) {
2705                                 /* copy IPv6 address */
2706                                 p_size = sizeof(struct sctp_ipv6addr_param);
2707                                 addr_size = sizeof(struct in6_addr);
2708                         } else {
2709                                 /* copy IPv4 address */
2710                                 p_size = sizeof(struct sctp_ipv4addr_param);
2711                                 addr_size = sizeof(struct in_addr);
2712                         }
2713                         lookup->ph.param_length = htons(SCTP_SIZE32(p_size));
2714                         memcpy(lookup->addr, &aa->ap.addrp.addr, addr_size);
2715                         SCTP_BUF_LEN(m_asconf_chk) += SCTP_SIZE32(p_size);
2716                         lookup_used = 1;
2717                 }
2718                 /* copy into current space */
2719                 memcpy(ptr, &aa->ap, p_length);
2720
2721                 /* network elements and update lengths */
2722                 aph = (struct sctp_asconf_paramhdr *)ptr;
2723                 aap = (struct sctp_asconf_addr_param *)ptr;
2724                 /* correlation_id is transparent to peer, no htonl needed */
2725                 aph->ph.param_type = htons(aph->ph.param_type);
2726                 aph->ph.param_length = htons(aph->ph.param_length);
2727                 aap->addrp.ph.param_type = htons(aap->addrp.ph.param_type);
2728                 aap->addrp.ph.param_length = htons(aap->addrp.ph.param_length);
2729
2730                 SCTP_BUF_LEN(m_asconf) += SCTP_SIZE32(p_length);
2731                 ptr += SCTP_SIZE32(p_length);
2732
2733                 /*
2734                  * these params are removed off the pending list upon
2735                  * getting an ASCONF-ACK back from the peer, just set flag
2736                  */
2737                 aa->sent = 1;
2738         }
2739         /* check to see if the lookup addr has been populated yet */
2740         if (lookup_used == 0) {
2741                 /* NOTE: if the address param is optional, can skip this... */
2742                 /* add any valid (existing) address... */
2743                 struct sctp_ipv6addr_param *lookup;
2744                 uint16_t p_size, addr_size;
2745                 struct sockaddr *found_addr;
2746                 caddr_t addr_ptr;
2747
2748                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL)
2749                         found_addr = sctp_find_valid_localaddr(stcb,
2750                             addr_locked);
2751                 else
2752                         found_addr = sctp_find_valid_localaddr_ep(stcb);
2753
2754                 lookup = (struct sctp_ipv6addr_param *)lookup_ptr;
2755                 if (found_addr != NULL) {
2756                         if (found_addr->sa_family == AF_INET6) {
2757                                 /* copy IPv6 address */
2758                                 lookup->ph.param_type =
2759                                     htons(SCTP_IPV6_ADDRESS);
2760                                 p_size = sizeof(struct sctp_ipv6addr_param);
2761                                 addr_size = sizeof(struct in6_addr);
2762                                 addr_ptr = (caddr_t)&((struct sockaddr_in6 *)
2763                                     found_addr)->sin6_addr;
2764                         } else {
2765                                 /* copy IPv4 address */
2766                                 lookup->ph.param_type =
2767                                     htons(SCTP_IPV4_ADDRESS);
2768                                 p_size = sizeof(struct sctp_ipv4addr_param);
2769                                 addr_size = sizeof(struct in_addr);
2770                                 addr_ptr = (caddr_t)&((struct sockaddr_in *)
2771                                     found_addr)->sin_addr;
2772                         }
2773                         lookup->ph.param_length = htons(SCTP_SIZE32(p_size));
2774                         memcpy(lookup->addr, addr_ptr, addr_size);
2775                         SCTP_BUF_LEN(m_asconf_chk) += SCTP_SIZE32(p_size);
2776                         lookup_used = 1;
2777                 } else {
2778                         /* uh oh... don't have any address?? */
2779                         SCTPDBG(SCTP_DEBUG_ASCONF1,
2780                             "compose_asconf: no lookup addr!\n");
2781                         /* for now, we send a IPv4 address of 0.0.0.0 */
2782                         lookup->ph.param_type = htons(SCTP_IPV4_ADDRESS);
2783                         lookup->ph.param_length = htons(SCTP_SIZE32(sizeof(struct sctp_ipv4addr_param)));
2784                         bzero(lookup->addr, sizeof(struct in_addr));
2785                         SCTP_BUF_LEN(m_asconf_chk) += SCTP_SIZE32(sizeof(struct sctp_ipv4addr_param));
2786                         lookup_used = 1;
2787                 }
2788         }
2789         /* chain it all together */
2790         SCTP_BUF_NEXT(m_asconf_chk) = m_asconf;
2791         *retlen = SCTP_BUF_LEN(m_asconf_chk) + SCTP_BUF_LEN(m_asconf);
2792         acp->ch.chunk_length = ntohs(*retlen);
2793
2794         return (m_asconf_chk);
2795 }
2796
2797 /*
2798  * section to handle address changes before an association is up eg. changes
2799  * during INIT/INIT-ACK/COOKIE-ECHO handshake
2800  */
2801
2802 /*
2803  * processes the (local) addresses in the INIT-ACK chunk
2804  */
2805 static void
2806 sctp_process_initack_addresses(struct sctp_tcb *stcb, struct mbuf *m,
2807     unsigned int offset, unsigned int length)
2808 {
2809         struct sctp_paramhdr tmp_param, *ph;
2810         uint16_t plen, ptype;
2811         struct sctp_ifa *sctp_ifa;
2812         struct sctp_ipv6addr_param addr_store;
2813         struct sockaddr_in6 sin6;
2814         struct sockaddr_in sin;
2815         struct sockaddr *sa;
2816         uint32_t vrf_id;
2817
2818         SCTPDBG(SCTP_DEBUG_ASCONF2, "processing init-ack addresses\n");
2819         if (stcb == NULL)       /* Un-needed check for SA */
2820                 return;
2821
2822         /* convert to upper bound */
2823         length += offset;
2824
2825         if ((offset + sizeof(struct sctp_paramhdr)) > length) {
2826                 return;
2827         }
2828         /* init the addresses */
2829         bzero(&sin6, sizeof(sin6));
2830         sin6.sin6_family = AF_INET6;
2831         sin6.sin6_len = sizeof(sin6);
2832         sin6.sin6_port = stcb->rport;
2833
2834         bzero(&sin, sizeof(sin));
2835         sin.sin_len = sizeof(sin);
2836         sin.sin_family = AF_INET;
2837         sin.sin_port = stcb->rport;
2838
2839         /* go through the addresses in the init-ack */
2840         ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset,
2841             sizeof(struct sctp_paramhdr), (uint8_t *) & tmp_param);
2842         while (ph != NULL) {
2843                 ptype = ntohs(ph->param_type);
2844                 plen = ntohs(ph->param_length);
2845                 if (ptype == SCTP_IPV6_ADDRESS) {
2846                         struct sctp_ipv6addr_param *a6p;
2847
2848                         /* get the entire IPv6 address param */
2849                         a6p = (struct sctp_ipv6addr_param *)
2850                             sctp_m_getptr(m, offset,
2851                             sizeof(struct sctp_ipv6addr_param),
2852                             (uint8_t *) & addr_store);
2853                         if (plen != sizeof(struct sctp_ipv6addr_param) ||
2854                             a6p == NULL) {
2855                                 return;
2856                         }
2857                         memcpy(&sin6.sin6_addr, a6p->addr,
2858                             sizeof(struct in6_addr));
2859                         sa = (struct sockaddr *)&sin6;
2860                 } else if (ptype == SCTP_IPV4_ADDRESS) {
2861                         struct sctp_ipv4addr_param *a4p;
2862
2863                         /* get the entire IPv4 address param */
2864                         a4p = (struct sctp_ipv4addr_param *)sctp_m_getptr(m, offset,
2865                             sizeof(struct sctp_ipv4addr_param),
2866                             (uint8_t *) & addr_store);
2867                         if (plen != sizeof(struct sctp_ipv4addr_param) ||
2868                             a4p == NULL) {
2869                                 return;
2870                         }
2871                         sin.sin_addr.s_addr = a4p->addr;
2872                         sa = (struct sockaddr *)&sin;
2873                 } else {
2874                         goto next_addr;
2875                 }
2876
2877                 /* see if this address really (still) exists */
2878                 if (stcb) {
2879                         vrf_id = stcb->asoc.vrf_id;
2880                 } else {
2881                         vrf_id = SCTP_DEFAULT_VRFID;
2882                 }
2883                 sctp_ifa = sctp_find_ifa_by_addr(sa, vrf_id,
2884                     SCTP_ADDR_NOT_LOCKED);
2885                 if (sctp_ifa == NULL) {
2886                         /* address doesn't exist anymore */
2887                         int status;
2888
2889                         /* are ASCONFs allowed ? */
2890                         if ((sctp_is_feature_on(stcb->sctp_ep,
2891                             SCTP_PCB_FLAGS_DO_ASCONF)) &&
2892                             stcb->asoc.peer_supports_asconf) {
2893                                 /* queue an ASCONF DEL_IP_ADDRESS */
2894                                 status = sctp_asconf_queue_sa_delete(stcb, sa);
2895                                 /*
2896                                  * if queued ok, and in correct state, send
2897                                  * out the ASCONF.
2898                                  */
2899                                 if (status == 0 &&
2900                                     SCTP_GET_STATE(&stcb->asoc) ==
2901                                     SCTP_STATE_OPEN) {
2902 #ifdef SCTP_TIMER_BASED_ASCONF
2903                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2904                                             stcb->sctp_ep, stcb,
2905                                             stcb->asoc.primary_destination);
2906 #else
2907                                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2908                                             SCTP_ADDR_NOT_LOCKED);
2909 #endif
2910                                 }
2911                         }
2912                 }
2913 next_addr:
2914                 /*
2915                  * Sanity check:  Make sure the length isn't 0, otherwise
2916                  * we'll be stuck in this loop for a long time...
2917                  */
2918                 if (SCTP_SIZE32(plen) == 0) {
2919                         SCTP_PRINTF("process_initack_addrs: bad len (%d) type=%xh\n",
2920                             plen, ptype);
2921                         return;
2922                 }
2923                 /* get next parameter */
2924                 offset += SCTP_SIZE32(plen);
2925                 if ((offset + sizeof(struct sctp_paramhdr)) > length)
2926                         return;
2927                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset,
2928                     sizeof(struct sctp_paramhdr), (uint8_t *) & tmp_param);
2929         }                       /* while */
2930 }
2931
2932 /* FIX ME: need to verify return result for v6 address type if v6 disabled */
2933 /*
2934  * checks to see if a specific address is in the initack address list returns
2935  * 1 if found, 0 if not
2936  */
2937 static uint32_t
2938 sctp_addr_in_initack(struct sctp_tcb *stcb, struct mbuf *m, uint32_t offset,
2939     uint32_t length, struct sockaddr *sa)
2940 {
2941         struct sctp_paramhdr tmp_param, *ph;
2942         uint16_t plen, ptype;
2943         struct sctp_ipv6addr_param addr_store;
2944         struct sockaddr_in *sin;
2945         struct sctp_ipv4addr_param *a4p;
2946
2947 #ifdef INET6
2948         struct sockaddr_in6 *sin6;
2949         struct sctp_ipv6addr_param *a6p;
2950         struct sockaddr_in6 sin6_tmp;
2951
2952 #endif                          /* INET6 */
2953
2954         if (
2955 #ifdef INET6
2956             (sa->sa_family != AF_INET6) &&
2957 #endif                          /* INET6 */
2958             (sa->sa_family != AF_INET))
2959                 return (0);
2960
2961         SCTPDBG(SCTP_DEBUG_ASCONF2, "find_initack_addr: starting search for ");
2962         SCTPDBG_ADDR(SCTP_DEBUG_ASCONF2, sa);
2963         /* convert to upper bound */
2964         length += offset;
2965
2966         if ((offset + sizeof(struct sctp_paramhdr)) > length) {
2967                 SCTPDBG(SCTP_DEBUG_ASCONF1,
2968                     "find_initack_addr: invalid offset?\n");
2969                 return (0);
2970         }
2971         /* go through the addresses in the init-ack */
2972         ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset,
2973             sizeof(struct sctp_paramhdr), (uint8_t *) & tmp_param);
2974         while (ph != NULL) {
2975                 ptype = ntohs(ph->param_type);
2976                 plen = ntohs(ph->param_length);
2977 #ifdef INET6
2978                 if (ptype == SCTP_IPV6_ADDRESS && sa->sa_family == AF_INET6) {
2979                         /* get the entire IPv6 address param */
2980                         a6p = (struct sctp_ipv6addr_param *)
2981                             sctp_m_getptr(m, offset,
2982                             sizeof(struct sctp_ipv6addr_param),
2983                             (uint8_t *) & addr_store);
2984                         if (plen != sizeof(struct sctp_ipv6addr_param) ||
2985                             (ph == NULL) ||
2986                             (a6p == NULL)) {
2987                                 return (0);
2988                         }
2989                         sin6 = (struct sockaddr_in6 *)sa;
2990                         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) {
2991                                 /* create a copy and clear scope */
2992                                 memcpy(&sin6_tmp, sin6,
2993                                     sizeof(struct sockaddr_in6));
2994                                 sin6 = &sin6_tmp;
2995                                 in6_clearscope(&sin6->sin6_addr);
2996                         }
2997                         if (memcmp(&sin6->sin6_addr, a6p->addr,
2998                             sizeof(struct in6_addr)) == 0) {
2999                                 /* found it */
3000                                 return (1);
3001                         }
3002                 } else
3003 #endif                          /* INET6 */
3004
3005                         if (ptype == SCTP_IPV4_ADDRESS &&
3006                     sa->sa_family == AF_INET) {
3007                         /* get the entire IPv4 address param */
3008                         a4p = (struct sctp_ipv4addr_param *)sctp_m_getptr(m,
3009                             offset, sizeof(struct sctp_ipv4addr_param),
3010                             (uint8_t *) & addr_store);
3011                         if (plen != sizeof(struct sctp_ipv4addr_param) ||
3012                             (ph == NULL) ||
3013                             (a4p == NULL)) {
3014                                 return (0);
3015                         }
3016                         sin = (struct sockaddr_in *)sa;
3017                         if (sin->sin_addr.s_addr == a4p->addr) {
3018                                 /* found it */
3019                                 return (1);
3020                         }
3021                 }
3022                 /* get next parameter */
3023                 offset += SCTP_SIZE32(plen);
3024                 if (offset + sizeof(struct sctp_paramhdr) > length)
3025                         return (0);
3026                 ph = (struct sctp_paramhdr *)
3027                     sctp_m_getptr(m, offset, sizeof(struct sctp_paramhdr),
3028                     (uint8_t *) & tmp_param);
3029         }                       /* while */
3030         /* not found! */
3031         return (0);
3032 }
3033
3034 /*
3035  * makes sure that the current endpoint local addr list is consistent with
3036  * the new association (eg. subset bound, asconf allowed) adds addresses as
3037  * necessary
3038  */
3039 static void
3040 sctp_check_address_list_ep(struct sctp_tcb *stcb, struct mbuf *m, int offset,
3041     int length, struct sockaddr *init_addr)
3042 {
3043         struct sctp_laddr *laddr;
3044
3045         /* go through the endpoint list */
3046         LIST_FOREACH(laddr, &stcb->sctp_ep->sctp_addr_list, sctp_nxt_addr) {
3047                 /* be paranoid and validate the laddr */
3048                 if (laddr->ifa == NULL) {
3049                         SCTPDBG(SCTP_DEBUG_ASCONF1,
3050                             "check_addr_list_ep: laddr->ifa is NULL");
3051                         continue;
3052                 }
3053                 if (laddr->ifa == NULL) {
3054                         SCTPDBG(SCTP_DEBUG_ASCONF1, "check_addr_list_ep: laddr->ifa->ifa_addr is NULL");
3055                         continue;
3056                 }
3057                 /* do i have it implicitly? */
3058                 if (sctp_cmpaddr(&laddr->ifa->address.sa, init_addr)) {
3059                         continue;
3060                 }
3061                 /* check to see if in the init-ack */
3062                 if (!sctp_addr_in_initack(stcb, m, offset, length,
3063                     &laddr->ifa->address.sa)) {
3064                         /* try to add it */
3065                         sctp_addr_mgmt_assoc(stcb->sctp_ep, stcb, laddr->ifa,
3066                             SCTP_ADD_IP_ADDRESS, SCTP_ADDR_NOT_LOCKED);
3067                 }
3068         }
3069 }
3070
3071 /*
3072  * makes sure that the current kernel address list is consistent with the new
3073  * association (with all addrs bound) adds addresses as necessary
3074  */
3075 static void
3076 sctp_check_address_list_all(struct sctp_tcb *stcb, struct mbuf *m, int offset,
3077     int length, struct sockaddr *init_addr,
3078     uint16_t local_scope, uint16_t site_scope,
3079     uint16_t ipv4_scope, uint16_t loopback_scope)
3080 {
3081         struct sctp_vrf *vrf = NULL;
3082         struct sctp_ifn *sctp_ifn;
3083         struct sctp_ifa *sctp_ifa;
3084         uint32_t vrf_id;
3085
3086         if (stcb) {
3087                 vrf_id = stcb->asoc.vrf_id;
3088         } else {
3089                 return;
3090         }
3091         SCTP_IPI_ADDR_RLOCK();
3092         vrf = sctp_find_vrf(vrf_id);
3093         if (vrf == NULL) {
3094                 SCTP_IPI_ADDR_RUNLOCK();
3095                 return;
3096         }
3097         /* go through all our known interfaces */
3098         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3099                 if (loopback_scope == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3100                         /* skip loopback interface */
3101                         continue;
3102                 }
3103                 /* go through each interface address */
3104                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3105                         /* do i have it implicitly? */
3106                         if (sctp_cmpaddr(&sctp_ifa->address.sa, init_addr)) {
3107                                 continue;
3108                         }
3109                         /* check to see if in the init-ack */
3110                         if (!sctp_addr_in_initack(stcb, m, offset, length,
3111                             &sctp_ifa->address.sa)) {
3112                                 /* try to add it */
3113                                 sctp_addr_mgmt_assoc(stcb->sctp_ep, stcb,
3114                                     sctp_ifa, SCTP_ADD_IP_ADDRESS,
3115                                     SCTP_ADDR_LOCKED);
3116                         }
3117                 }               /* end foreach ifa */
3118         }                       /* end foreach ifn */
3119         SCTP_IPI_ADDR_RUNLOCK();
3120 }
3121
3122 /*
3123  * validates an init-ack chunk (from a cookie-echo) with current addresses
3124  * adds addresses from the init-ack into our local address list, if needed
3125  * queues asconf adds/deletes addresses as needed and makes appropriate list
3126  * changes for source address selection m, offset: points to the start of the
3127  * address list in an init-ack chunk length: total length of the address
3128  * params only init_addr: address where my INIT-ACK was sent from
3129  */
3130 void
3131 sctp_check_address_list(struct sctp_tcb *stcb, struct mbuf *m, int offset,
3132     int length, struct sockaddr *init_addr,
3133     uint16_t local_scope, uint16_t site_scope,
3134     uint16_t ipv4_scope, uint16_t loopback_scope)
3135 {
3136         /* process the local addresses in the initack */
3137         sctp_process_initack_addresses(stcb, m, offset, length);
3138
3139         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3140                 /* bound all case */
3141                 sctp_check_address_list_all(stcb, m, offset, length, init_addr,
3142                     local_scope, site_scope, ipv4_scope, loopback_scope);
3143         } else {
3144                 /* subset bound case */
3145                 if (sctp_is_feature_on(stcb->sctp_ep,
3146                     SCTP_PCB_FLAGS_DO_ASCONF)) {
3147                         /* asconf's allowed */
3148                         sctp_check_address_list_ep(stcb, m, offset, length,
3149                             init_addr);
3150                 }
3151                 /* else, no asconfs allowed, so what we sent is what we get */
3152         }
3153 }
3154
3155 /*
3156  * sctp_bindx() support
3157  */
3158 uint32_t
3159 sctp_addr_mgmt_ep_sa(struct sctp_inpcb *inp, struct sockaddr *sa,
3160     uint32_t type, uint32_t vrf_id, struct sctp_ifa *sctp_ifap)
3161 {
3162         struct sctp_ifa *ifa;
3163
3164         if (sa->sa_len == 0) {
3165                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_ASCONF, EINVAL);
3166                 return (EINVAL);
3167         }
3168         if (sctp_ifap) {
3169                 ifa = sctp_ifap;
3170         } else if (type == SCTP_ADD_IP_ADDRESS) {
3171                 /* For an add the address MUST be on the system */
3172                 ifa = sctp_find_ifa_by_addr(sa, vrf_id, SCTP_ADDR_NOT_LOCKED);
3173         } else if (type == SCTP_DEL_IP_ADDRESS) {
3174                 /* For a delete we need to find it in the inp */
3175                 ifa = sctp_find_ifa_in_ep(inp, sa, SCTP_ADDR_NOT_LOCKED);
3176         } else {
3177                 ifa = NULL;
3178         }
3179         if (ifa != NULL) {
3180                 /* add this address */
3181                 struct sctp_asconf_iterator *asc;
3182                 struct sctp_laddr *wi;
3183
3184                 SCTP_MALLOC(asc, struct sctp_asconf_iterator *,
3185                     sizeof(struct sctp_asconf_iterator),
3186                     SCTP_M_ASC_IT);
3187                 if (asc == NULL) {
3188                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_ASCONF, ENOMEM);
3189                         return (ENOMEM);
3190                 }
3191                 wi = SCTP_ZONE_GET(sctppcbinfo.ipi_zone_laddr,
3192                     struct sctp_laddr);
3193                 if (wi == NULL) {
3194                         SCTP_FREE(asc, SCTP_M_ASC_IT);
3195                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_ASCONF, ENOMEM);
3196                         return (ENOMEM);
3197                 }
3198                 if (type == SCTP_ADD_IP_ADDRESS) {
3199                         sctp_add_local_addr_ep(inp, ifa, type);
3200                 } else if (type == SCTP_DEL_IP_ADDRESS) {
3201                         struct sctp_laddr *laddr;
3202
3203                         if (inp->laddr_count < 2) {
3204                                 /* can't delete the last local address */
3205                                 SCTP_FREE(asc, SCTP_M_ASC_IT);
3206                                 SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_laddr, wi);
3207                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_ASCONF, EINVAL);
3208                                 return (EINVAL);
3209                         }
3210                         LIST_FOREACH(laddr, &inp->sctp_addr_list,
3211                             sctp_nxt_addr) {
3212                                 if (ifa == laddr->ifa) {
3213                                         /* Mark in the delete */
3214                                         laddr->action = type;
3215                                 }
3216                         }
3217                 }
3218                 LIST_INIT(&asc->list_of_work);
3219                 asc->cnt = 1;
3220                 SCTP_INCR_LADDR_COUNT();
3221                 wi->ifa = ifa;
3222                 wi->action = type;
3223                 atomic_add_int(&ifa->refcount, 1);
3224                 LIST_INSERT_HEAD(&asc->list_of_work, wi, sctp_nxt_addr);
3225                 (void)sctp_initiate_iterator(sctp_asconf_iterator_ep,
3226                     sctp_asconf_iterator_stcb,
3227                     sctp_asconf_iterator_ep_end,
3228                     SCTP_PCB_ANY_FLAGS,
3229                     SCTP_PCB_ANY_FEATURES,
3230                     SCTP_ASOC_ANY_STATE,
3231                     (void *)asc, 0,
3232                     sctp_asconf_iterator_end, inp, 0);
3233         } else {
3234                 /* invalid address! */
3235                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_ASCONF, EADDRNOTAVAIL);
3236                 return (EADDRNOTAVAIL);
3237         }
3238         return (0);
3239 }