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_BASE_SYSCTL(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_BASE_SYSCTL(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_BASE_SYSCTL(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 to
 560                  * REQ_PRIM, The retransmission occur when reception of the
 561                  * 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(SCTP_BASE_INFO(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_NAT_VTAGS:
 765                         SCTPDBG(SCTP_DEBUG_ASCONF1, "handle_asconf: sees a NAT VTAG state parameter\n");
 766                         break;
 767                 case SCTP_SUCCESS_REPORT:
 768                         /* not valid in an ASCONF chunk */
 769                         break;
 770                 case SCTP_ULP_ADAPTATION:
 771                         /* FIX */
 772                         break;
 773                 default:
 774                         if ((param_type & 0x8000) == 0) {
 775                                 /* Been told to STOP at this param */
 776                                 asconf_limit = offset;
 777                                 /*
 778                                  * FIX FIX - We need to call
 779                                  * sctp_arethere_unrecognized_parameters()
 780                                  * to get a operr and send it for any
 781                                  * param's with the 0x4000 bit set OR do it
 782                                  * here ourselves... note we still must STOP
 783                                  * if the 0x8000 bit is clear.
 784                                  */
 785                         }
 786                         /* unknown/invalid param type */
 787                         break;
 788                 }               /* switch */
 789
 790                 /* add any (error) result to the reply mbuf chain */
 791                 if (m_result != NULL) {
 792                         SCTP_BUF_NEXT(m_tail) = m_result;
 793                         m_tail = m_result;
 794                         /* update lengths, make sure it's aligned too */
 795                         SCTP_BUF_LEN(m_result) = SCTP_SIZE32(SCTP_BUF_LEN(m_result));
 796                         ack_cp->ch.chunk_length += SCTP_BUF_LEN(m_result);
 797                         /* set flag to force success reports */
 798                         error = 1;
 799                 }
 800                 offset += SCTP_SIZE32(param_length);
 801                 /* update remaining ASCONF message length to process */
 802                 if (offset >= asconf_limit) {
 803                         /* no more data in the mbuf chain */
 804                         break;
 805                 }
 806                 /* get pointer to next asconf param */
 807                 aph = (struct sctp_asconf_paramhdr *)sctp_m_getptr(m, offset,
 808                     sizeof(struct sctp_asconf_paramhdr),
 809                     (uint8_t *) & aparam_buf);
 810                 if (aph == NULL) {
 811                         /* can't get an asconf paramhdr */
 812                         SCTPDBG(SCTP_DEBUG_ASCONF1, "handle_asconf: can't get asconf param hdr!\n");
 813                         /* FIX ME - add error here... */
 814                 }
 815         }
 816
 817 send_reply:
 818         ack_cp->ch.chunk_length = htons(ack_cp->ch.chunk_length);
 819         /* save the ASCONF-ACK reply */
 820         ack = SCTP_ZONE_GET(SCTP_BASE_INFO(ipi_zone_asconf_ack),
 821             struct sctp_asconf_ack);
 822         if (ack == NULL) {
 823                 sctp_m_freem(m_ack);
 824                 return;
 825         }
 826         ack->serial_number = serial_num;
 827         ack->last_sent_to = NULL;
 828         ack->data = m_ack;
 829         n = m_ack;
 830         while (n) {
 831                 ack->len += SCTP_BUF_LEN(n);
 832                 n = SCTP_BUF_NEXT(n);
 833         }
 834         TAILQ_INSERT_TAIL(&stcb->asoc.asconf_ack_sent, ack, next);
 835
 836         /* see if last_control_chunk_from is set properly (use IP src addr) */
 837         if (stcb->asoc.last_control_chunk_from == NULL) {
 838                 /*
 839                  * this could happen if the source address was just newly
 840                  * added
 841                  */
 842                 struct ip *iph;
 843                 struct sctphdr *sh;
 844                 struct sockaddr_storage from_store;
 845                 struct sockaddr *from = (struct sockaddr *)&from_store;
 846
 847                 SCTPDBG(SCTP_DEBUG_ASCONF1, "handle_asconf: looking up net for IP source address\n");
 848                 /* pullup already done, IP options already stripped */
 849                 iph = mtod(m, struct ip *);
 850                 sh = (struct sctphdr *)((caddr_t)iph + sizeof(*iph));
 851                 switch (iph->ip_v) {
 852                 case IPVERSION:
 853                         {
 854                                 struct sockaddr_in *from4;
 855
 856                                 from4 = (struct sockaddr_in *)&from_store;
 857                                 bzero(from4, sizeof(*from4));
 858                                 from4->sin_family = AF_INET;
 859                                 from4->sin_len = sizeof(struct sockaddr_in);
 860                                 from4->sin_addr.s_addr = iph->ip_src.s_addr;
 861                                 from4->sin_port = sh->src_port;
 862                                 break;
 863                         }
 864 #ifdef INET6
 865                 case IPV6_VERSION >> 4:
 866                         {
 867                                 struct ip6_hdr *ip6;
 868                                 struct sockaddr_in6 *from6;
 869
 870                                 ip6 = mtod(m, struct ip6_hdr *);
 871                                 from6 = (struct sockaddr_in6 *)&from_store;
 872                                 bzero(from6, sizeof(*from6));
 873                                 from6->sin6_family = AF_INET6;
 874                                 from6->sin6_len = sizeof(struct sockaddr_in6);
 875                                 from6->sin6_addr = ip6->ip6_src;
 876                                 from6->sin6_port = sh->src_port;
 877                                 /*
 878                                  * Get the scopes in properly to the sin6
 879                                  * addr's
 880                                  */
 881                                 /* we probably don't need these operations */
 882                                 (void)sa6_recoverscope(from6);
 883                                 sa6_embedscope(from6,
 884                                     MODULE_GLOBAL(ip6_use_defzone));
 885
 886                                 break;
 887                         }
 888 #endif
 889                 default:
 890                         /* unknown address type */
 891                         from = NULL;
 892                 }
 893                 if (from != NULL) {
 894                         SCTPDBG(SCTP_DEBUG_ASCONF1, "Looking for IP source: ");
 895                         SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, from);
 896                         /* look up the from address */
 897                         stcb->asoc.last_control_chunk_from = sctp_findnet(stcb, from);
 898 #ifdef SCTP_DEBUG
 899                         if (stcb->asoc.last_control_chunk_from == NULL)
 900                                 SCTPDBG(SCTP_DEBUG_ASCONF1, "handle_asconf: IP source address not found?!\n");
 901 #endif
 902                 }
 903         }
 904 }
 905
 906 /*
 907  * does the address match? returns 0 if not, 1 if so
 908  */
 909 static uint32_t
 910 sctp_asconf_addr_match(struct sctp_asconf_addr *aa, struct sockaddr *sa)
 911 {
 912 #ifdef INET6
 913         if (sa->sa_family == AF_INET6) {
 914                 /* IPv6 sa address */
 915                 /* XXX scopeid */
 916                 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
 917
 918                 if ((aa->ap.addrp.ph.param_type == SCTP_IPV6_ADDRESS) &&
 919                     (memcmp(&aa->ap.addrp.addr, &sin6->sin6_addr,
 920                     sizeof(struct in6_addr)) == 0)) {
 921                         return (1);
 922                 }
 923         } else
 924 #endif                          /* INET6 */
 925         if (sa->sa_family == AF_INET) {
 926                 /* IPv4 sa address */
 927                 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
 928
 929                 if ((aa->ap.addrp.ph.param_type == SCTP_IPV4_ADDRESS) &&
 930                     (memcmp(&aa->ap.addrp.addr, &sin->sin_addr,
 931                     sizeof(struct in_addr)) == 0)) {
 932                         return (1);
 933                 }
 934         }
 935         return (0);
 936 }
 937
 938 /*
 939  * does the address match? returns 0 if not, 1 if so
 940  */
 941 static uint32_t
 942 sctp_addr_match(
 943     struct sctp_ipv6addr_param *v6addr,
 944     struct sockaddr *sa)
 945 {
 946         uint16_t param_type, param_length;
 947         struct sctp_ipv4addr_param *v4addr = (struct sctp_ipv4addr_param *)v6addr;
 948
 949 #ifdef INET6
 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         }
 965 #endif
 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, 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         aa->special_del = 0;
1356         /* fill in asconf address parameter fields */
1357         /* top level elements are "networked" during send */
1358         aa->ap.aph.ph.param_type = type;
1359         aa->ifa = ifa;
1360         atomic_add_int(&ifa->refcount, 1);
1361         /* correlation_id filled in during send routine later... */
1362         if (ifa->address.sa.sa_family == AF_INET6) {
1363                 /* IPv6 address */
1364                 struct sockaddr_in6 *sin6;
1365
1366                 sin6 = (struct sockaddr_in6 *)&ifa->address.sa;
1367                 sa = (struct sockaddr *)sin6;
1368                 aa->ap.addrp.ph.param_type = SCTP_IPV6_ADDRESS;
1369                 aa->ap.addrp.ph.param_length = (sizeof(struct sctp_ipv6addr_param));
1370                 aa->ap.aph.ph.param_length = sizeof(struct sctp_asconf_paramhdr) +
1371                     sizeof(struct sctp_ipv6addr_param);
1372                 memcpy(&aa->ap.addrp.addr, &sin6->sin6_addr,
1373                     sizeof(struct in6_addr));
1374         } else if (ifa->address.sa.sa_family == AF_INET) {
1375                 /* IPv4 address */
1376                 struct sockaddr_in *sin;
1377
1378                 sin = (struct sockaddr_in *)&ifa->address.sa;
1379                 sa = (struct sockaddr *)sin;
1380                 aa->ap.addrp.ph.param_type = SCTP_IPV4_ADDRESS;
1381                 aa->ap.addrp.ph.param_length = (sizeof(struct sctp_ipv4addr_param));
1382                 aa->ap.aph.ph.param_length = sizeof(struct sctp_asconf_paramhdr) +
1383                     sizeof(struct sctp_ipv4addr_param);
1384                 memcpy(&aa->ap.addrp.addr, &sin->sin_addr,
1385                     sizeof(struct in_addr));
1386         } else {
1387                 /* invalid family! */
1388                 SCTP_FREE(aa, SCTP_M_ASC_ADDR);
1389                 sctp_free_ifa(ifa);
1390                 return (-1);
1391         }
1392         aa->sent = 0;           /* clear sent flag */
1393
1394         TAILQ_INSERT_TAIL(&stcb->asoc.asconf_queue, aa, next);
1395 #ifdef SCTP_DEBUG
1396         if (SCTP_BASE_SYSCTL(sctp_debug_on) && SCTP_DEBUG_ASCONF2) {
1397                 if (type == SCTP_ADD_IP_ADDRESS) {
1398                         SCTP_PRINTF("asconf_queue_mgmt: inserted asconf ADD_IP_ADDRESS: ");
1399                         SCTPDBG_ADDR(SCTP_DEBUG_ASCONF2, sa);
1400                 } else if (type == SCTP_DEL_IP_ADDRESS) {
1401                         SCTP_PRINTF("asconf_queue_mgmt: appended asconf DEL_IP_ADDRESS: ");
1402                         SCTPDBG_ADDR(SCTP_DEBUG_ASCONF2, sa);
1403                 } else {
1404                         SCTP_PRINTF("asconf_queue_mgmt: appended asconf SET_PRIM_ADDR: ");
1405                         SCTPDBG_ADDR(SCTP_DEBUG_ASCONF2, sa);
1406                 }
1407         }
1408 #endif
1409
1410         return (0);
1411 }
1412
1413
1414 /*
1415  * add an asconf operation for the given ifa and type.
1416  * type = SCTP_ADD_IP_ADDRESS, SCTP_DEL_IP_ADDRESS, SCTP_SET_PRIM_ADDR.
1417  * returns 0 if completed, -1 if not completed, 1 if immediate send is
1418  * advisable.
1419  */
1420 static int
1421 sctp_asconf_queue_add(struct sctp_tcb *stcb, struct sctp_ifa *ifa,
1422     uint16_t type)
1423 {
1424         uint32_t status;
1425         int pending_delete_queued = 0;
1426
1427         /* see if peer supports ASCONF */
1428         if (stcb->asoc.peer_supports_asconf == 0) {
1429                 return (-1);
1430         }
1431         /*
1432          * if this is deleting the last address from the assoc, mark it as
1433          * pending.
1434          */
1435         if ((type == SCTP_DEL_IP_ADDRESS) && !stcb->asoc.asconf_del_pending &&
1436             (sctp_local_addr_count(stcb) < 2)) {
1437                 /* set the pending delete info only */
1438                 stcb->asoc.asconf_del_pending = 1;
1439                 stcb->asoc.asconf_addr_del_pending = ifa;
1440                 atomic_add_int(&ifa->refcount, 1);
1441                 SCTPDBG(SCTP_DEBUG_ASCONF2,
1442                     "asconf_queue_add: mark delete last address pending\n");
1443                 return (-1);
1444         }
1445         /* queue an asconf parameter */
1446         status = sctp_asconf_queue_mgmt(stcb, ifa, type);
1447
1448         /*
1449          * if this is an add, and there is a delete also pending (i.e. the
1450          * last local address is being changed), queue the pending delete
1451          * too.
1452          */
1453         if ((type == SCTP_ADD_IP_ADDRESS) && stcb->asoc.asconf_del_pending && (status == 0)) {
1454                 /* queue in the pending delete */
1455                 if (sctp_asconf_queue_mgmt(stcb,
1456                     stcb->asoc.asconf_addr_del_pending,
1457                     SCTP_DEL_IP_ADDRESS) == 0) {
1458                         SCTPDBG(SCTP_DEBUG_ASCONF2, "asconf_queue_add: queing pending delete\n");
1459                         pending_delete_queued = 1;
1460                         /* clear out the pending delete info */
1461                         stcb->asoc.asconf_del_pending = 0;
1462                         sctp_free_ifa(stcb->asoc.asconf_addr_del_pending);
1463                         stcb->asoc.asconf_addr_del_pending = NULL;
1464                 }
1465         }
1466         if (pending_delete_queued) {
1467                 struct sctp_nets *net;
1468
1469                 /*
1470                  * since we know that the only/last address is now being
1471                  * changed in this case, reset the cwnd/rto on all nets to
1472                  * start as a new address and path.  Also clear the error
1473                  * counts to give the assoc the best chance to complete the
1474                  * address change.
1475                  */
1476                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1477                         stcb->asoc.cc_functions.sctp_set_initial_cc_param(stcb,
1478                             net);
1479                         net->RTO = 0;
1480                         net->error_count = 0;
1481                 }
1482                 stcb->asoc.overall_error_count = 0;
1483                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1484                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1485                             stcb->asoc.overall_error_count,
1486                             0,
1487                             SCTP_FROM_SCTP_ASCONF,
1488                             __LINE__);
1489                 }
1490                 /* queue in an advisory set primary too */
1491                 (void)sctp_asconf_queue_mgmt(stcb, ifa, SCTP_SET_PRIM_ADDR);
1492                 /* let caller know we should send this out immediately */
1493                 status = 1;
1494         }
1495         return (status);
1496 }
1497
1498 /*-
1499  * add an asconf delete IP address parameter to the queue by sockaddr and
1500  * possibly with no sctp_ifa available.  This is only called by the routine
1501  * that checks the addresses in an INIT-ACK against the current address list.
1502  * returns 0 if completed, non-zero if not completed.
1503  * NOTE: if an add is already scheduled (and not yet sent out), simply
1504  * remove it from queue.  If a duplicate operation is found, ignore the
1505  * new one.
1506  */
1507 static int
1508 sctp_asconf_queue_sa_delete(struct sctp_tcb *stcb, struct sockaddr *sa)
1509 {
1510         struct sctp_ifa *ifa;
1511         struct sctp_asconf_addr *aa, *aa_next;
1512         uint32_t vrf_id;
1513
1514         if (stcb == NULL) {
1515                 return (-1);
1516         }
1517         /* see if peer supports ASCONF */
1518         if (stcb->asoc.peer_supports_asconf == 0) {
1519                 return (-1);
1520         }
1521         /* make sure the request isn't already in the queue */
1522         for (aa = TAILQ_FIRST(&stcb->asoc.asconf_queue); aa != NULL;
1523             aa = aa_next) {
1524                 aa_next = TAILQ_NEXT(aa, next);
1525                 /* address match? */
1526                 if (sctp_asconf_addr_match(aa, sa) == 0)
1527                         continue;
1528                 /* is the request already in queue (sent or not) */
1529                 if (aa->ap.aph.ph.param_type == SCTP_DEL_IP_ADDRESS) {
1530                         return (-1);
1531                 }
1532                 /* is the negative request already in queue, and not sent */
1533                 if (aa->sent == 1)
1534                         continue;
1535                 if (aa->ap.aph.ph.param_type == SCTP_ADD_IP_ADDRESS) {
1536                         /* add already queued, so remove existing entry */
1537                         TAILQ_REMOVE(&stcb->asoc.asconf_queue, aa, next);
1538                         sctp_del_local_addr_restricted(stcb, aa->ifa);
1539                         /* free the entry */
1540                         SCTP_FREE(aa, SCTP_M_ASC_ADDR);
1541                         return (-1);
1542                 }
1543         }                       /* for each aa */
1544
1545         /* find any existing ifa-- NOTE ifa CAN be allowed to be NULL */
1546         if (stcb) {
1547                 vrf_id = stcb->asoc.vrf_id;
1548         } else {
1549                 vrf_id = SCTP_DEFAULT_VRFID;
1550         }
1551         ifa = sctp_find_ifa_by_addr(sa, vrf_id, SCTP_ADDR_NOT_LOCKED);
1552
1553         /* adding new request to the queue */
1554         SCTP_MALLOC(aa, struct sctp_asconf_addr *, sizeof(*aa),
1555             SCTP_M_ASC_ADDR);
1556         if (aa == NULL) {
1557                 /* didn't get memory */
1558                 SCTPDBG(SCTP_DEBUG_ASCONF1,
1559                     "sctp_asconf_queue_sa_delete: failed to get memory!\n");
1560                 return (-1);
1561         }
1562         aa->special_del = 0;
1563         /* fill in asconf address parameter fields */
1564         /* top level elements are "networked" during send */
1565         aa->ap.aph.ph.param_type = SCTP_DEL_IP_ADDRESS;
1566         aa->ifa = ifa;
1567         if (ifa)
1568                 atomic_add_int(&ifa->refcount, 1);
1569         /* correlation_id filled in during send routine later... */
1570         if (sa->sa_family == AF_INET6) {
1571                 /* IPv6 address */
1572                 struct sockaddr_in6 *sin6;
1573
1574                 sin6 = (struct sockaddr_in6 *)sa;
1575                 aa->ap.addrp.ph.param_type = SCTP_IPV6_ADDRESS;
1576                 aa->ap.addrp.ph.param_length = (sizeof(struct sctp_ipv6addr_param));
1577                 aa->ap.aph.ph.param_length = sizeof(struct sctp_asconf_paramhdr) + sizeof(struct sctp_ipv6addr_param);
1578                 memcpy(&aa->ap.addrp.addr, &sin6->sin6_addr,
1579                     sizeof(struct in6_addr));
1580         } else if (sa->sa_family == AF_INET) {
1581                 /* IPv4 address */
1582                 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
1583
1584                 aa->ap.addrp.ph.param_type = SCTP_IPV4_ADDRESS;
1585                 aa->ap.addrp.ph.param_length = (sizeof(struct sctp_ipv4addr_param));
1586                 aa->ap.aph.ph.param_length = sizeof(struct sctp_asconf_paramhdr) + sizeof(struct sctp_ipv4addr_param);
1587                 memcpy(&aa->ap.addrp.addr, &sin->sin_addr,
1588                     sizeof(struct in_addr));
1589         } else {
1590                 /* invalid family! */
1591                 SCTP_FREE(aa, SCTP_M_ASC_ADDR);
1592                 if (ifa)
1593                         sctp_free_ifa(ifa);
1594                 return (-1);
1595         }
1596         aa->sent = 0;           /* clear sent flag */
1597
1598         /* delete goes to the back of the queue */
1599         TAILQ_INSERT_TAIL(&stcb->asoc.asconf_queue, aa, next);
1600
1601         /* sa_ignore MEMLEAK {memory is put on the tailq} */
1602         return (0);
1603 }
1604
1605 /*
1606  * find a specific asconf param on our "sent" queue
1607  */
1608 static struct sctp_asconf_addr *
1609 sctp_asconf_find_param(struct sctp_tcb *stcb, uint32_t correlation_id)
1610 {
1611         struct sctp_asconf_addr *aa;
1612
1613         TAILQ_FOREACH(aa, &stcb->asoc.asconf_queue, next) {
1614                 if (aa->ap.aph.correlation_id == correlation_id &&
1615                     aa->sent == 1) {
1616                         /* found it */
1617                         return (aa);
1618                 }
1619         }
1620         /* didn't find it */
1621         return (NULL);
1622 }
1623
1624 /*
1625  * process an SCTP_ERROR_CAUSE_IND for a ASCONF-ACK parameter and do
1626  * notifications based on the error response
1627  */
1628 static void
1629 sctp_asconf_process_error(struct sctp_tcb *stcb,
1630     struct sctp_asconf_paramhdr *aph)
1631 {
1632         struct sctp_error_cause *eh;
1633         struct sctp_paramhdr *ph;
1634         uint16_t param_type;
1635         uint16_t error_code;
1636
1637         eh = (struct sctp_error_cause *)(aph + 1);
1638         ph = (struct sctp_paramhdr *)(eh + 1);
1639         /* validate lengths */
1640         if (htons(eh->length) + sizeof(struct sctp_error_cause) >
1641             htons(aph->ph.param_length)) {
1642                 /* invalid error cause length */
1643                 SCTPDBG(SCTP_DEBUG_ASCONF1,
1644                     "asconf_process_error: cause element too long\n");
1645                 return;
1646         }
1647         if (htons(ph->param_length) + sizeof(struct sctp_paramhdr) >
1648             htons(eh->length)) {
1649                 /* invalid included TLV length */
1650                 SCTPDBG(SCTP_DEBUG_ASCONF1,
1651                     "asconf_process_error: included TLV too long\n");
1652                 return;
1653         }
1654         /* which error code ? */
1655         error_code = ntohs(eh->code);
1656         param_type = ntohs(aph->ph.param_type);
1657         /* FIX: this should go back up the REMOTE_ERROR ULP notify */
1658         switch (error_code) {
1659         case SCTP_CAUSE_RESOURCE_SHORTAGE:
1660                 /* we allow ourselves to "try again" for this error */
1661                 break;
1662         default:
1663                 /* peer can't handle it... */
1664                 switch (param_type) {
1665                 case SCTP_ADD_IP_ADDRESS:
1666                 case SCTP_DEL_IP_ADDRESS:
1667                         stcb->asoc.peer_supports_asconf = 0;
1668                         break;
1669                 case SCTP_SET_PRIM_ADDR:
1670                         stcb->asoc.peer_supports_asconf = 0;
1671                         break;
1672                 default:
1673                         break;
1674                 }
1675         }
1676 }
1677
1678 /*
1679  * process an asconf queue param.
1680  * aparam: parameter to process, will be removed from the queue.
1681  * flag: 1=success case, 0=failure case
1682  */
1683 static void
1684 sctp_asconf_process_param_ack(struct sctp_tcb *stcb,
1685     struct sctp_asconf_addr *aparam, uint32_t flag)
1686 {
1687         uint16_t param_type;
1688
1689         /* process this param */
1690         param_type = aparam->ap.aph.ph.param_type;
1691         switch (param_type) {
1692         case SCTP_ADD_IP_ADDRESS:
1693                 SCTPDBG(SCTP_DEBUG_ASCONF1,
1694                     "process_param_ack: added IP address\n");
1695                 sctp_asconf_addr_mgmt_ack(stcb, aparam->ifa, param_type, flag);
1696                 break;
1697         case SCTP_DEL_IP_ADDRESS:
1698                 SCTPDBG(SCTP_DEBUG_ASCONF1,
1699                     "process_param_ack: deleted IP address\n");
1700                 /* nothing really to do... lists already updated */
1701                 break;
1702         case SCTP_SET_PRIM_ADDR:
1703                 SCTPDBG(SCTP_DEBUG_ASCONF1,
1704                     "process_param_ack: set primary IP address\n");
1705                 /* nothing to do... peer may start using this addr */
1706                 if (flag == 0)
1707                         stcb->asoc.peer_supports_asconf = 0;
1708                 break;
1709         default:
1710                 /* should NEVER happen */
1711                 break;
1712         }
1713
1714         /* remove the param and free it */
1715         TAILQ_REMOVE(&stcb->asoc.asconf_queue, aparam, next);
1716         if (aparam->ifa)
1717                 sctp_free_ifa(aparam->ifa);
1718         SCTP_FREE(aparam, SCTP_M_ASC_ADDR);
1719 }
1720
1721 /*
1722  * cleanup from a bad asconf ack parameter
1723  */
1724 static void
1725 sctp_asconf_ack_clear(struct sctp_tcb *stcb)
1726 {
1727         /* assume peer doesn't really know how to do asconfs */
1728         stcb->asoc.peer_supports_asconf = 0;
1729         /* XXX we could free the pending queue here */
1730 }
1731
1732 void
1733 sctp_handle_asconf_ack(struct mbuf *m, int offset,
1734     struct sctp_asconf_ack_chunk *cp, struct sctp_tcb *stcb,
1735     struct sctp_nets *net, int *abort_no_unlock)
1736 {
1737         struct sctp_association *asoc;
1738         uint32_t serial_num;
1739         uint16_t ack_length;
1740         struct sctp_asconf_paramhdr *aph;
1741         struct sctp_asconf_addr *aa, *aa_next;
1742         uint32_t last_error_id = 0;     /* last error correlation id */
1743         uint32_t id;
1744         struct sctp_asconf_addr *ap;
1745
1746         /* asconf param buffer */
1747         uint8_t aparam_buf[SCTP_PARAM_BUFFER_SIZE];
1748
1749         /* verify minimum length */
1750         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_asconf_ack_chunk)) {
1751                 SCTPDBG(SCTP_DEBUG_ASCONF1,
1752                     "handle_asconf_ack: chunk too small = %xh\n",
1753                     ntohs(cp->ch.chunk_length));
1754                 return;
1755         }
1756         asoc = &stcb->asoc;
1757         serial_num = ntohl(cp->serial_number);
1758
1759         /*
1760          * NOTE: we may want to handle this differently- currently, we will
1761          * abort when we get an ack for the expected serial number + 1 (eg.
1762          * we didn't send it), process an ack normally if it is the expected
1763          * serial number, and re-send the previous ack for *ALL* other
1764          * serial numbers
1765          */
1766
1767         /*
1768          * if the serial number is the next expected, but I didn't send it,
1769          * abort the asoc, since someone probably just hijacked us...
1770          */
1771         if (serial_num == (asoc->asconf_seq_out + 1)) {
1772                 SCTPDBG(SCTP_DEBUG_ASCONF1, "handle_asconf_ack: got unexpected next serial number! Aborting asoc!\n");
1773                 sctp_abort_an_association(stcb->sctp_ep, stcb,
1774                     SCTP_CAUSE_ILLEGAL_ASCONF_ACK, NULL, SCTP_SO_NOT_LOCKED);
1775                 *abort_no_unlock = 1;
1776                 return;
1777         }
1778         if (serial_num != asoc->asconf_seq_out_acked + 1) {
1779                 /* got a duplicate/unexpected ASCONF-ACK */
1780                 SCTPDBG(SCTP_DEBUG_ASCONF1, "handle_asconf_ack: got duplicate/unexpected serial number = %xh (expected = %xh)\n",
1781                     serial_num, asoc->asconf_seq_out_acked + 1);
1782                 return;
1783         }
1784         if (serial_num == asoc->asconf_seq_out - 1) {
1785                 /* stop our timer */
1786                 sctp_timer_stop(SCTP_TIMER_TYPE_ASCONF, stcb->sctp_ep, stcb, net,
1787                     SCTP_FROM_SCTP_ASCONF + SCTP_LOC_3);
1788         }
1789         /* process the ASCONF-ACK contents */
1790         ack_length = ntohs(cp->ch.chunk_length) -
1791             sizeof(struct sctp_asconf_ack_chunk);
1792         offset += sizeof(struct sctp_asconf_ack_chunk);
1793         /* process through all parameters */
1794         while (ack_length >= sizeof(struct sctp_asconf_paramhdr)) {
1795                 unsigned int param_length, param_type;
1796
1797                 /* get pointer to next asconf parameter */
1798                 aph = (struct sctp_asconf_paramhdr *)sctp_m_getptr(m, offset,
1799                     sizeof(struct sctp_asconf_paramhdr), aparam_buf);
1800                 if (aph == NULL) {
1801                         /* can't get an asconf paramhdr */
1802                         sctp_asconf_ack_clear(stcb);
1803                         return;
1804                 }
1805                 param_type = ntohs(aph->ph.param_type);
1806                 param_length = ntohs(aph->ph.param_length);
1807                 if (param_length > ack_length) {
1808                         sctp_asconf_ack_clear(stcb);
1809                         return;
1810                 }
1811                 if (param_length < sizeof(struct sctp_paramhdr)) {
1812                         sctp_asconf_ack_clear(stcb);
1813                         return;
1814                 }
1815                 /* get the complete parameter... */
1816                 if (param_length > sizeof(aparam_buf)) {
1817                         SCTPDBG(SCTP_DEBUG_ASCONF1,
1818                             "param length (%u) larger than buffer size!\n", param_length);
1819                         sctp_asconf_ack_clear(stcb);
1820                         return;
1821                 }
1822                 aph = (struct sctp_asconf_paramhdr *)sctp_m_getptr(m, offset, param_length, aparam_buf);
1823                 if (aph == NULL) {
1824                         sctp_asconf_ack_clear(stcb);
1825                         return;
1826                 }
1827                 /* correlation_id is transparent to peer, no ntohl needed */
1828                 id = aph->correlation_id;
1829
1830                 switch (param_type) {
1831                 case SCTP_ERROR_CAUSE_IND:
1832                         last_error_id = id;
1833                         /* find the corresponding asconf param in our queue */
1834                         ap = sctp_asconf_find_param(stcb, id);
1835                         if (ap == NULL) {
1836                                 /* hmm... can't find this in our queue! */
1837                                 break;
1838                         }
1839                         /* process the parameter, failed flag */
1840                         sctp_asconf_process_param_ack(stcb, ap, 0);
1841                         /* process the error response */
1842                         sctp_asconf_process_error(stcb, aph);
1843                         break;
1844                 case SCTP_SUCCESS_REPORT:
1845                         /* find the corresponding asconf param in our queue */
1846                         ap = sctp_asconf_find_param(stcb, id);
1847                         if (ap == NULL) {
1848                                 /* hmm... can't find this in our queue! */
1849                                 break;
1850                         }
1851                         /* process the parameter, success flag */
1852                         sctp_asconf_process_param_ack(stcb, ap, 1);
1853                         break;
1854                 default:
1855                         break;
1856                 }               /* switch */
1857
1858                 /* update remaining ASCONF-ACK message length to process */
1859                 ack_length -= SCTP_SIZE32(param_length);
1860                 if (ack_length <= 0) {
1861                         /* no more data in the mbuf chain */
1862                         break;
1863                 }
1864                 offset += SCTP_SIZE32(param_length);
1865         }                       /* while */
1866
1867         /*
1868          * if there are any "sent" params still on the queue, these are
1869          * implicitly "success", or "failed" (if we got an error back) ...
1870          * so process these appropriately
1871          *
1872          * we assume that the correlation_id's are monotonically increasing
1873          * beginning from 1 and that we don't have *that* many outstanding
1874          * at any given time
1875          */
1876         if (last_error_id == 0)
1877                 last_error_id--;/* set to "max" value */
1878         for (aa = TAILQ_FIRST(&stcb->asoc.asconf_queue); aa != NULL;
1879             aa = aa_next) {
1880                 aa_next = TAILQ_NEXT(aa, next);
1881                 if (aa->sent == 1) {
1882                         /*
1883                          * implicitly successful or failed if correlation_id
1884                          * < last_error_id, then success else, failure
1885                          */
1886                         if (aa->ap.aph.correlation_id < last_error_id)
1887                                 sctp_asconf_process_param_ack(stcb, aa, 1);
1888                         else
1889                                 sctp_asconf_process_param_ack(stcb, aa, 0);
1890                 } else {
1891                         /*
1892                          * since we always process in order (FIFO queue) if
1893                          * we reach one that hasn't been sent, the rest
1894                          * should not have been sent either. so, we're
1895                          * done...
1896                          */
1897                         break;
1898                 }
1899         }
1900
1901         /* update the next sequence number to use */
1902         asoc->asconf_seq_out_acked++;
1903         /* remove the old ASCONF on our outbound queue */
1904         sctp_toss_old_asconf(stcb);
1905         if (!TAILQ_EMPTY(&stcb->asoc.asconf_queue)) {
1906 #ifdef SCTP_TIMER_BASED_ASCONF
1907                 /* we have more params, so restart our timer */
1908                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, stcb->sctp_ep,
1909                     stcb, net);
1910 #else
1911                 /* we have more params, so send out more */
1912                 sctp_send_asconf(stcb, net, SCTP_ADDR_NOT_LOCKED);
1913 #endif
1914         }
1915 }
1916
1917 #ifdef INET6
1918 static uint32_t
1919 sctp_is_scopeid_in_nets(struct sctp_tcb *stcb, struct sockaddr *sa)
1920 {
1921         struct sockaddr_in6 *sin6, *net6;
1922         struct sctp_nets *net;
1923
1924         if (sa->sa_family != AF_INET6) {
1925                 /* wrong family */
1926                 return (0);
1927         }
1928         sin6 = (struct sockaddr_in6 *)sa;
1929         if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) == 0) {
1930                 /* not link local address */
1931                 return (0);
1932         }
1933         /* hunt through our destination nets list for this scope_id */
1934         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1935                 if (((struct sockaddr *)(&net->ro._l_addr))->sa_family !=
1936                     AF_INET6)
1937                         continue;
1938                 net6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1939                 if (IN6_IS_ADDR_LINKLOCAL(&net6->sin6_addr) == 0)
1940                         continue;
1941                 if (sctp_is_same_scope(sin6, net6)) {
1942                         /* found one */
1943                         return (1);
1944                 }
1945         }
1946         /* didn't find one */
1947         return (0);
1948 }
1949
1950 #endif
1951
1952 /*
1953  * address management functions
1954  */
1955 static void
1956 sctp_addr_mgmt_assoc(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1957     struct sctp_ifa *ifa, uint16_t type, int addr_locked)
1958 {
1959         int status;
1960
1961
1962         if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) == 0 &&
1963             sctp_is_feature_off(inp, SCTP_PCB_FLAGS_DO_ASCONF)) {
1964                 /* subset bound, no ASCONF allowed case, so ignore */
1965                 return;
1966         }
1967         /*
1968          * note: we know this is not the subset bound, no ASCONF case eg.
1969          * this is boundall or subset bound w/ASCONF allowed
1970          */
1971
1972         /* first, make sure it's a good address family */
1973         if (ifa->address.sa.sa_family != AF_INET6 &&
1974             ifa->address.sa.sa_family != AF_INET) {
1975                 return;
1976         }
1977         /* make sure we're "allowed" to add this type of addr */
1978         if (ifa->address.sa.sa_family == AF_INET6) {
1979                 /* invalid if we're not a v6 endpoint */
1980                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0)
1981                         return;
1982                 /* is the v6 addr really valid ? */
1983                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1984                         return;
1985                 }
1986         }
1987         /* put this address on the "pending/do not use yet" list */
1988         sctp_add_local_addr_restricted(stcb, ifa);
1989         /*
1990          * check address scope if address is out of scope, don't queue
1991          * anything... note: this would leave the address on both inp and
1992          * asoc lists
1993          */
1994         switch (ifa->address.sa.sa_family) {
1995 #ifdef INET6
1996         case AF_INET6:
1997                 {
1998                         struct sockaddr_in6 *sin6;
1999
2000                         sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
2001                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
2002                                 /* we skip unspecifed addresses */
2003                                 return;
2004                         }
2005                         if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
2006                                 if (stcb->asoc.local_scope == 0) {
2007                                         return;
2008                                 }
2009                                 /* is it the right link local scope? */
2010                                 if (sctp_is_scopeid_in_nets(stcb, &ifa->address.sa) == 0) {
2011                                         return;
2012                                 }
2013                         }
2014                         if (stcb->asoc.site_scope == 0 &&
2015                             IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) {
2016                                 return;
2017                         }
2018                         break;
2019                 }
2020 #endif
2021         case AF_INET:
2022                 {
2023                         struct sockaddr_in *sin;
2024                         struct in6pcb *inp6;
2025
2026                         inp6 = (struct in6pcb *)&inp->ip_inp.inp;
2027                         /* invalid if we are a v6 only endpoint */
2028                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) &&
2029                             SCTP_IPV6_V6ONLY(inp6))
2030                                 return;
2031
2032                         sin = (struct sockaddr_in *)&ifa->address.sa;
2033                         if (sin->sin_addr.s_addr == 0) {
2034                                 /* we skip unspecifed addresses */
2035                                 return;
2036                         }
2037                         if (stcb->asoc.ipv4_local_scope == 0 &&
2038                             IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) {
2039                                 return;
2040                         }
2041                         break;
2042                 }
2043         default:
2044                 /* else, not AF_INET or AF_INET6, so skip */
2045                 return;
2046         }
2047
2048         /* queue an asconf for this address add/delete */
2049         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_DO_ASCONF)) {
2050                 /* does the peer do asconf? */
2051                 if (stcb->asoc.peer_supports_asconf) {
2052                         /* queue an asconf for this addr */
2053                         status = sctp_asconf_queue_add(stcb, ifa, type);
2054
2055                         /*
2056                          * if queued ok, and in the open state, send out the
2057                          * ASCONF.  If in the non-open state, these will be
2058                          * sent when the state goes open.
2059                          */
2060                         if (status == 0 &&
2061                             SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
2062 #ifdef SCTP_TIMER_BASED_ASCONF
2063                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
2064                                     stcb, stcb->asoc.primary_destination);
2065 #else
2066                                 sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2067                                     addr_locked);
2068 #endif
2069                         }
2070                 }
2071         }
2072 }
2073
2074
2075 int
2076 sctp_asconf_iterator_ep(struct sctp_inpcb *inp, void *ptr, uint32_t val)
2077 {
2078         struct sctp_asconf_iterator *asc;
2079         struct sctp_ifa *ifa;
2080         struct sctp_laddr *l;
2081         int type;
2082         int cnt_invalid = 0;
2083
2084         asc = (struct sctp_asconf_iterator *)ptr;
2085         LIST_FOREACH(l, &asc->list_of_work, sctp_nxt_addr) {
2086                 ifa = l->ifa;
2087                 type = l->action;
2088                 if (ifa->address.sa.sa_family == AF_INET6) {
2089                         /* invalid if we're not a v6 endpoint */
2090                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) {
2091                                 cnt_invalid++;
2092                                 if (asc->cnt == cnt_invalid)
2093                                         return (1);
2094                                 else
2095                                         continue;
2096                         }
2097                 } else if (ifa->address.sa.sa_family == AF_INET) {
2098                         /* invalid if we are a v6 only endpoint */
2099                         struct in6pcb *inp6;
2100
2101                         inp6 = (struct in6pcb *)&inp->ip_inp.inp;
2102                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) &&
2103                             SCTP_IPV6_V6ONLY(inp6)) {
2104                                 cnt_invalid++;
2105                                 if (asc->cnt == cnt_invalid)
2106                                         return (1);
2107                                 else
2108                                         continue;
2109                         }
2110                 } else {
2111                         /* invalid address family */
2112                         cnt_invalid++;
2113                         if (asc->cnt == cnt_invalid)
2114                                 return (1);
2115                         else
2116                                 continue;
2117                 }
2118         }
2119         return (0);
2120 }
2121
2122 static int
2123 sctp_asconf_iterator_ep_end(struct sctp_inpcb *inp, void *ptr, uint32_t val)
2124 {
2125         struct sctp_ifa *ifa;
2126         struct sctp_asconf_iterator *asc;
2127         struct sctp_laddr *laddr, *nladdr, *l;
2128
2129         /* Only for specific case not bound all */
2130         asc = (struct sctp_asconf_iterator *)ptr;
2131         LIST_FOREACH(l, &asc->list_of_work, sctp_nxt_addr) {
2132                 ifa = l->ifa;
2133                 if (l->action == SCTP_ADD_IP_ADDRESS) {
2134                         LIST_FOREACH(laddr, &inp->sctp_addr_list,
2135                             sctp_nxt_addr) {
2136                                 if (laddr->ifa == ifa) {
2137                                         laddr->action = 0;
2138                                         break;
2139                                 }
2140                         }
2141                 } else if (l->action == SCTP_DEL_IP_ADDRESS) {
2142                         laddr = LIST_FIRST(&inp->sctp_addr_list);
2143                         while (laddr) {
2144                                 nladdr = LIST_NEXT(laddr, sctp_nxt_addr);
2145                                 /* remove only after all guys are done */
2146                                 if (laddr->ifa == ifa) {
2147                                         sctp_del_local_addr_ep(inp, ifa);
2148                                 }
2149                                 laddr = nladdr;
2150                         }
2151                 }
2152         }
2153         return (0);
2154 }
2155
2156 void
2157 sctp_asconf_iterator_stcb(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2158     void *ptr, uint32_t val)
2159 {
2160         struct sctp_asconf_iterator *asc;
2161         struct sctp_ifa *ifa;
2162         struct sctp_laddr *l;
2163         int cnt_invalid = 0;
2164         int type, status;
2165         int num_queued = 0;
2166
2167         asc = (struct sctp_asconf_iterator *)ptr;
2168         LIST_FOREACH(l, &asc->list_of_work, sctp_nxt_addr) {
2169                 ifa = l->ifa;
2170                 type = l->action;
2171
2172                 /* address's vrf_id must be the vrf_id of the assoc */
2173                 if (ifa->vrf_id != stcb->asoc.vrf_id) {
2174                         continue;
2175                 }
2176                 /* Same checks again for assoc */
2177                 switch (ifa->address.sa.sa_family) {
2178 #ifdef INET6
2179                 case AF_INET6:
2180                         {
2181                                 /* invalid if we're not a v6 endpoint */
2182                                 struct sockaddr_in6 *sin6;
2183
2184                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) {
2185                                         cnt_invalid++;
2186                                         if (asc->cnt == cnt_invalid)
2187                                                 return;
2188                                         else
2189                                                 continue;
2190                                 }
2191                                 sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
2192                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
2193                                         /* we skip unspecifed addresses */
2194                                         continue;
2195                                 }
2196                                 if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
2197                                         if (stcb->asoc.local_scope == 0) {
2198                                                 continue;
2199                                         }
2200                                         /* is it the right link local scope? */
2201                                         if (sctp_is_scopeid_in_nets(stcb, &ifa->address.sa) == 0) {
2202                                                 continue;
2203                                         }
2204                                 }
2205                                 break;
2206                         }
2207 #endif
2208                 case AF_INET:
2209                         {
2210                                 /* invalid if we are a v6 only endpoint */
2211                                 struct in6pcb *inp6;
2212                                 struct sockaddr_in *sin;
2213
2214                                 inp6 = (struct in6pcb *)&inp->ip_inp.inp;
2215                                 /* invalid if we are a v6 only endpoint */
2216                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) &&
2217                                     SCTP_IPV6_V6ONLY(inp6))
2218                                         continue;
2219
2220                                 sin = (struct sockaddr_in *)&ifa->address.sa;
2221                                 if (sin->sin_addr.s_addr == 0) {
2222                                         /* we skip unspecifed addresses */
2223                                         continue;
2224                                 }
2225                                 if (stcb->asoc.ipv4_local_scope == 0 &&
2226                                     IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) {
2227                                         continue;
2228                                 }
2229                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) &&
2230                                     SCTP_IPV6_V6ONLY(inp6)) {
2231                                         cnt_invalid++;
2232                                         if (asc->cnt == cnt_invalid)
2233                                                 return;
2234                                         else
2235                                                 continue;
2236                                 }
2237                                 break;
2238                         }
2239                 default:
2240                         /* invalid address family */
2241                         cnt_invalid++;
2242                         if (asc->cnt == cnt_invalid)
2243                                 return;
2244                         else
2245                                 continue;
2246                         break;
2247                 }
2248
2249                 if (type == SCTP_ADD_IP_ADDRESS) {
2250                         /* prevent this address from being used as a source */
2251                         sctp_add_local_addr_restricted(stcb, ifa);
2252                 } else if (type == SCTP_DEL_IP_ADDRESS) {
2253                         struct sctp_nets *net;
2254
2255                         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
2256                                 sctp_rtentry_t *rt;
2257
2258                                 /* delete this address if cached */
2259                                 if (net->ro._s_addr == ifa) {
2260                                         sctp_free_ifa(net->ro._s_addr);
2261                                         net->ro._s_addr = NULL;
2262                                         net->src_addr_selected = 0;
2263                                         rt = net->ro.ro_rt;
2264                                         if (rt) {
2265                                                 RTFREE(rt);
2266                                                 net->ro.ro_rt = NULL;
2267                                         }
2268                                         /*
2269                                          * Now we deleted our src address,
2270                                          * should we not also now reset the
2271                                          * cwnd/rto to start as if its a new
2272                                          * address?
2273                                          */
2274                                         stcb->asoc.cc_functions.sctp_set_initial_cc_param(stcb, net);
2275                                         net->RTO = 0;
2276
2277                                 }
2278                         }
2279                 } else if (type == SCTP_SET_PRIM_ADDR) {
2280                         if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) == 0) {
2281                                 /* must validate the ifa is in the ep */
2282                                 if (sctp_is_addr_in_ep(stcb->sctp_ep, ifa) == 0) {
2283                                         continue;
2284                                 }
2285                         } else {
2286                                 /* Need to check scopes for this guy */
2287                                 if (sctp_is_address_in_scope(ifa,
2288                                     stcb->asoc.ipv4_addr_legal,
2289                                     stcb->asoc.ipv6_addr_legal,
2290                                     stcb->asoc.loopback_scope,
2291                                     stcb->asoc.ipv4_local_scope,
2292                                     stcb->asoc.local_scope,
2293                                     stcb->asoc.site_scope, 0) == 0) {
2294                                         continue;
2295                                 }
2296                         }
2297                 }
2298                 /* queue an asconf for this address add/delete */
2299                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_DO_ASCONF) &&
2300                     stcb->asoc.peer_supports_asconf) {
2301                         /* queue an asconf for this addr */
2302                         status = sctp_asconf_queue_add(stcb, ifa, type);
2303                         /*
2304                          * if queued ok, and in the open state, update the
2305                          * count of queued params.  If in the non-open
2306                          * state, these get sent when the assoc goes open.
2307                          */
2308                         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
2309                                 if (status >= 0) {
2310                                         num_queued++;
2311                                 }
2312                         }
2313                 }
2314         }
2315         /*
2316          * If we have queued params in the open state, send out an ASCONF.
2317          */
2318         if (num_queued > 0) {
2319                 sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2320                     SCTP_ADDR_NOT_LOCKED);
2321         }
2322 }
2323
2324 void
2325 sctp_asconf_iterator_end(void *ptr, uint32_t val)
2326 {
2327         struct sctp_asconf_iterator *asc;
2328         struct sctp_ifa *ifa;
2329         struct sctp_laddr *l, *l_next;
2330
2331         asc = (struct sctp_asconf_iterator *)ptr;
2332         l = LIST_FIRST(&asc->list_of_work);
2333         while (l != NULL) {
2334                 l_next = LIST_NEXT(l, sctp_nxt_addr);
2335                 ifa = l->ifa;
2336                 if (l->action == SCTP_ADD_IP_ADDRESS) {
2337                         /* Clear the defer use flag */
2338                         ifa->localifa_flags &= ~SCTP_ADDR_DEFER_USE;
2339                 }
2340                 sctp_free_ifa(ifa);
2341                 SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_laddr), l);
2342                 SCTP_DECR_LADDR_COUNT();
2343                 l = l_next;
2344         }
2345         SCTP_FREE(asc, SCTP_M_ASC_IT);
2346 }
2347
2348 /*
2349  * sa is the sockaddr to ask the peer to set primary to.
2350  * returns: 0 = completed, -1 = error
2351  */
2352 int32_t
2353 sctp_set_primary_ip_address_sa(struct sctp_tcb *stcb, struct sockaddr *sa)
2354 {
2355         uint32_t vrf_id;
2356         struct sctp_ifa *ifa;
2357
2358         /* find the ifa for the desired set primary */
2359         vrf_id = stcb->asoc.vrf_id;
2360         ifa = sctp_find_ifa_by_addr(sa, vrf_id, SCTP_ADDR_NOT_LOCKED);
2361         if (ifa == NULL) {
2362                 /* Invalid address */
2363                 return (-1);
2364         }
2365         /* queue an ASCONF:SET_PRIM_ADDR to be sent */
2366         if (!sctp_asconf_queue_add(stcb, ifa, SCTP_SET_PRIM_ADDR)) {
2367                 /* set primary queuing succeeded */
2368                 SCTPDBG(SCTP_DEBUG_ASCONF1,
2369                     "set_primary_ip_address_sa: queued on tcb=%p, ",
2370                     stcb);
2371                 SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, sa);
2372                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
2373 #ifdef SCTP_TIMER_BASED_ASCONF
2374                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2375                             stcb->sctp_ep, stcb,
2376                             stcb->asoc.primary_destination);
2377 #else
2378                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2379                             SCTP_ADDR_NOT_LOCKED);
2380 #endif
2381                 }
2382         } else {
2383                 SCTPDBG(SCTP_DEBUG_ASCONF1, "set_primary_ip_address_sa: failed to add to queue on tcb=%p, ",
2384                     stcb);
2385                 SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, sa);
2386                 return (-1);
2387         }
2388         return (0);
2389 }
2390
2391 void
2392 sctp_set_primary_ip_address(struct sctp_ifa *ifa)
2393 {
2394         struct sctp_inpcb *inp;
2395
2396         /* go through all our PCB's */
2397         LIST_FOREACH(inp, &SCTP_BASE_INFO(listhead), sctp_list) {
2398                 struct sctp_tcb *stcb;
2399
2400                 /* process for all associations for this endpoint */
2401                 LIST_FOREACH(stcb, &inp->sctp_asoc_list, sctp_tcblist) {
2402                         /* queue an ASCONF:SET_PRIM_ADDR to be sent */
2403                         if (!sctp_asconf_queue_add(stcb, ifa,
2404                             SCTP_SET_PRIM_ADDR)) {
2405                                 /* set primary queuing succeeded */
2406                                 SCTPDBG(SCTP_DEBUG_ASCONF1, "set_primary_ip_address: queued on stcb=%p, ",
2407                                     stcb);
2408                                 SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, &ifa->address.sa);
2409                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
2410 #ifdef SCTP_TIMER_BASED_ASCONF
2411                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2412                                             stcb->sctp_ep, stcb,
2413                                             stcb->asoc.primary_destination);
2414 #else
2415                                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2416                                             SCTP_ADDR_NOT_LOCKED);
2417 #endif
2418                                 }
2419                         }
2420                 }               /* for each stcb */
2421         }                       /* for each inp */
2422 }
2423
2424 int
2425 sctp_is_addr_pending(struct sctp_tcb *stcb, struct sctp_ifa *sctp_ifa)
2426 {
2427         struct sctp_tmit_chunk *chk, *nchk;
2428         unsigned int offset, asconf_limit;
2429         struct sctp_asconf_chunk *acp;
2430         struct sctp_asconf_paramhdr *aph;
2431         uint8_t aparam_buf[SCTP_PARAM_BUFFER_SIZE];
2432         struct sctp_ipv6addr_param *p_addr;
2433         int add_cnt, del_cnt;
2434         uint16_t last_param_type;
2435
2436         add_cnt = del_cnt = 0;
2437         last_param_type = 0;
2438         for (chk = TAILQ_FIRST(&stcb->asoc.asconf_send_queue); chk != NULL;
2439             chk = nchk) {
2440                 /* get next chk */
2441                 nchk = TAILQ_NEXT(chk, sctp_next);
2442
2443                 if (chk->data == NULL) {
2444                         SCTPDBG(SCTP_DEBUG_ASCONF1, "is_addr_pending: No mbuf data?\n");
2445                         continue;
2446                 }
2447                 offset = 0;
2448                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
2449                 offset += sizeof(struct sctp_asconf_chunk);
2450                 asconf_limit = ntohs(acp->ch.chunk_length);
2451                 p_addr = (struct sctp_ipv6addr_param *)sctp_m_getptr(chk->data, offset, sizeof(struct sctp_paramhdr), aparam_buf);
2452                 if (p_addr == NULL) {
2453                         SCTPDBG(SCTP_DEBUG_ASCONF1, "is_addr_pending: couldn't get lookup addr!\n");
2454                         continue;
2455                 }
2456                 offset += ntohs(p_addr->ph.param_length);
2457
2458                 aph = (struct sctp_asconf_paramhdr *)sctp_m_getptr(chk->data, offset, sizeof(struct sctp_asconf_paramhdr), aparam_buf);
2459                 if (aph == NULL) {
2460                         SCTPDBG(SCTP_DEBUG_ASCONF1, "is_addr_pending: Empty ASCONF will be sent?\n");
2461                         continue;
2462                 }
2463                 while (aph != NULL) {
2464                         unsigned int param_length, param_type;
2465
2466                         param_type = ntohs(aph->ph.param_type);
2467                         param_length = ntohs(aph->ph.param_length);
2468                         if (offset + param_length > asconf_limit) {
2469                                 /* parameter goes beyond end of chunk! */
2470                                 break;
2471                         }
2472                         if (param_length > sizeof(aparam_buf)) {
2473                                 SCTPDBG(SCTP_DEBUG_ASCONF1, "is_addr_pending: param length (%u) larger than buffer size!\n", param_length);
2474                                 break;
2475                         }
2476                         if (param_length <= sizeof(struct sctp_paramhdr)) {
2477                                 SCTPDBG(SCTP_DEBUG_ASCONF1, "is_addr_pending: param length(%u) too short\n", param_length);
2478                                 break;
2479                         }
2480                         aph = (struct sctp_asconf_paramhdr *)sctp_m_getptr(chk->data, offset, param_length, aparam_buf);
2481                         if (aph == NULL) {
2482                                 SCTPDBG(SCTP_DEBUG_ASCONF1, "is_addr_pending: couldn't get entire param\n");
2483                                 break;
2484                         }
2485                         p_addr = (struct sctp_ipv6addr_param *)(aph + 1);
2486                         if (sctp_addr_match(p_addr, &sctp_ifa->address.sa) != 0) {
2487                                 switch (param_type) {
2488                                 case SCTP_ADD_IP_ADDRESS:
2489                                         add_cnt++;
2490                                         break;
2491                                 case SCTP_DEL_IP_ADDRESS:
2492                                         del_cnt++;
2493                                         break;
2494                                 default:
2495                                         break;
2496                                 }
2497                                 last_param_type = param_type;
2498                         }
2499                         offset += SCTP_SIZE32(param_length);
2500                         if (offset >= asconf_limit) {
2501                                 /* no more data in the mbuf chain */
2502                                 break;
2503                         }
2504                         /* get pointer to next asconf param */
2505                         aph = (struct sctp_asconf_paramhdr *)sctp_m_getptr(chk->data, offset, sizeof(struct sctp_asconf_paramhdr), aparam_buf);
2506                 }
2507         }
2508
2509         /*
2510          * we want to find the sequences which consist of ADD -> DEL -> ADD
2511          * or DEL -> ADD
2512          */
2513         if (add_cnt > del_cnt ||
2514             (add_cnt == del_cnt && last_param_type == SCTP_ADD_IP_ADDRESS)) {
2515                 return 1;
2516         }
2517         return 0;
2518 }
2519
2520 static struct sockaddr *
2521 sctp_find_valid_localaddr(struct sctp_tcb *stcb, int addr_locked)
2522 {
2523         struct sctp_vrf *vrf = NULL;
2524         struct sctp_ifn *sctp_ifn;
2525         struct sctp_ifa *sctp_ifa;
2526
2527         if (addr_locked == SCTP_ADDR_NOT_LOCKED)
2528                 SCTP_IPI_ADDR_RLOCK();
2529         vrf = sctp_find_vrf(stcb->asoc.vrf_id);
2530         if (vrf == NULL) {
2531                 if (addr_locked == SCTP_ADDR_NOT_LOCKED)
2532                         SCTP_IPI_ADDR_RUNLOCK();
2533                 return (NULL);
2534         }
2535         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
2536                 if (stcb->asoc.loopback_scope == 0 &&
2537                     SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
2538                         /* Skip if loopback_scope not set */
2539                         continue;
2540                 }
2541                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2542                         if (sctp_ifa->address.sa.sa_family == AF_INET &&
2543                             stcb->asoc.ipv4_addr_legal) {
2544                                 struct sockaddr_in *sin;
2545
2546                                 sin = (struct sockaddr_in *)&sctp_ifa->address.sa;
2547                                 if (sin->sin_addr.s_addr == 0) {
2548                                         /* skip unspecifed addresses */
2549                                         continue;
2550                                 }
2551                                 if (stcb->asoc.ipv4_local_scope == 0 &&
2552                                     IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))
2553                                         continue;
2554
2555                                 if (sctp_is_addr_restricted(stcb, sctp_ifa) &&
2556                                     (!sctp_is_addr_pending(stcb, sctp_ifa)))
2557                                         continue;
2558                                 /* found a valid local v4 address to use */
2559                                 if (addr_locked == SCTP_ADDR_NOT_LOCKED)
2560                                         SCTP_IPI_ADDR_RUNLOCK();
2561                                 return (&sctp_ifa->address.sa);
2562                         } else if (sctp_ifa->address.sa.sa_family == AF_INET6 &&
2563                             stcb->asoc.ipv6_addr_legal) {
2564                                 struct sockaddr_in6 *sin6;
2565
2566                                 if (sctp_ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2567                                         continue;
2568                                 }
2569                                 sin6 = (struct sockaddr_in6 *)&sctp_ifa->address.sa;
2570                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
2571                                         /* we skip unspecifed addresses */
2572                                         continue;
2573                                 }
2574                                 if (stcb->asoc.local_scope == 0 &&
2575                                     IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
2576                                         continue;
2577                                 if (stcb->asoc.site_scope == 0 &&
2578                                     IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))
2579                                         continue;
2580
2581                                 if (sctp_is_addr_restricted(stcb, sctp_ifa) &&
2582                                     (!sctp_is_addr_pending(stcb, sctp_ifa)))
2583                                         continue;
2584                                 /* found a valid local v6 address to use */
2585                                 if (addr_locked == SCTP_ADDR_NOT_LOCKED)
2586                                         SCTP_IPI_ADDR_RUNLOCK();
2587                                 return (&sctp_ifa->address.sa);
2588                         }
2589                 }
2590         }
2591         /* no valid addresses found */
2592         if (addr_locked == SCTP_ADDR_NOT_LOCKED)
2593                 SCTP_IPI_ADDR_RUNLOCK();
2594         return (NULL);
2595 }
2596
2597 static struct sockaddr *
2598 sctp_find_valid_localaddr_ep(struct sctp_tcb *stcb)
2599 {
2600         struct sctp_laddr *laddr;
2601
2602         LIST_FOREACH(laddr, &stcb->sctp_ep->sctp_addr_list, sctp_nxt_addr) {
2603                 if (laddr->ifa == NULL) {
2604                         continue;
2605                 }
2606                 /* is the address restricted ? */
2607                 if (sctp_is_addr_restricted(stcb, laddr->ifa) &&
2608                     (!sctp_is_addr_pending(stcb, laddr->ifa)))
2609                         continue;
2610
2611                 /* found a valid local address to use */
2612                 return (&laddr->ifa->address.sa);
2613         }
2614         /* no valid addresses found */
2615         return (NULL);
2616 }
2617
2618 /*
2619  * builds an ASCONF chunk from queued ASCONF params.
2620  * returns NULL on error (no mbuf, no ASCONF params queued, etc).
2621  */
2622 struct mbuf *
2623 sctp_compose_asconf(struct sctp_tcb *stcb, int *retlen, int addr_locked)
2624 {
2625         struct mbuf *m_asconf, *m_asconf_chk;
2626         struct sctp_asconf_addr *aa;
2627         struct sctp_asconf_chunk *acp;
2628         struct sctp_asconf_paramhdr *aph;
2629         struct sctp_asconf_addr_param *aap;
2630         uint32_t p_length;
2631         uint32_t correlation_id = 1;    /* 0 is reserved... */
2632         caddr_t ptr, lookup_ptr;
2633         uint8_t lookup_used = 0;
2634
2635         /* are there any asconf params to send? */
2636         TAILQ_FOREACH(aa, &stcb->asoc.asconf_queue, next) {
2637                 if (aa->sent == 0)
2638                         break;
2639         }
2640         if (aa == NULL)
2641                 return (NULL);
2642
2643         /*
2644          * get a chunk header mbuf and a cluster for the asconf params since
2645          * it's simpler to fill in the asconf chunk header lookup address on
2646          * the fly
2647          */
2648         m_asconf_chk = sctp_get_mbuf_for_msg(sizeof(struct sctp_asconf_chunk), 0, M_DONTWAIT, 1, MT_DATA);
2649         if (m_asconf_chk == NULL) {
2650                 /* no mbuf's */
2651                 SCTPDBG(SCTP_DEBUG_ASCONF1,
2652                     "compose_asconf: couldn't get chunk mbuf!\n");
2653                 return (NULL);
2654         }
2655         m_asconf = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
2656         if (m_asconf == NULL) {
2657                 /* no mbuf's */
2658                 SCTPDBG(SCTP_DEBUG_ASCONF1,
2659                     "compose_asconf: couldn't get mbuf!\n");
2660                 sctp_m_freem(m_asconf_chk);
2661                 return (NULL);
2662         }
2663         SCTP_BUF_LEN(m_asconf_chk) = sizeof(struct sctp_asconf_chunk);
2664         SCTP_BUF_LEN(m_asconf) = 0;
2665         acp = mtod(m_asconf_chk, struct sctp_asconf_chunk *);
2666         bzero(acp, sizeof(struct sctp_asconf_chunk));
2667         /* save pointers to lookup address and asconf params */
2668         lookup_ptr = (caddr_t)(acp + 1);        /* after the header */
2669         ptr = mtod(m_asconf, caddr_t);  /* beginning of cluster */
2670
2671         /* fill in chunk header info */
2672         acp->ch.chunk_type = SCTP_ASCONF;
2673         acp->ch.chunk_flags = 0;
2674         acp->serial_number = htonl(stcb->asoc.asconf_seq_out);
2675         stcb->asoc.asconf_seq_out++;
2676
2677         /* add parameters... up to smallest MTU allowed */
2678         TAILQ_FOREACH(aa, &stcb->asoc.asconf_queue, next) {
2679                 if (aa->sent)
2680                         continue;
2681                 /* get the parameter length */
2682                 p_length = SCTP_SIZE32(aa->ap.aph.ph.param_length);
2683                 /* will it fit in current chunk? */
2684                 if (SCTP_BUF_LEN(m_asconf) + p_length > stcb->asoc.smallest_mtu) {
2685                         /* won't fit, so we're done with this chunk */
2686                         break;
2687                 }
2688                 /* assign (and store) a correlation id */
2689                 aa->ap.aph.correlation_id = correlation_id++;
2690
2691                 /*
2692                  * fill in address if we're doing a delete this is a simple
2693                  * way for us to fill in the correlation address, which
2694                  * should only be used by the peer if we're deleting our
2695                  * source address and adding a new address (e.g. renumbering
2696                  * case)
2697                  */
2698                 if (lookup_used == 0 &&
2699                     (aa->special_del == 0) &&
2700                     aa->ap.aph.ph.param_type == SCTP_DEL_IP_ADDRESS) {
2701                         struct sctp_ipv6addr_param *lookup;
2702                         uint16_t p_size, addr_size;
2703
2704                         lookup = (struct sctp_ipv6addr_param *)lookup_ptr;
2705                         lookup->ph.param_type =
2706                             htons(aa->ap.addrp.ph.param_type);
2707                         if (aa->ap.addrp.ph.param_type == SCTP_IPV6_ADDRESS) {
2708                                 /* copy IPv6 address */
2709                                 p_size = sizeof(struct sctp_ipv6addr_param);
2710                                 addr_size = sizeof(struct in6_addr);
2711                         } else {
2712                                 /* copy IPv4 address */
2713                                 p_size = sizeof(struct sctp_ipv4addr_param);
2714                                 addr_size = sizeof(struct in_addr);
2715                         }
2716                         lookup->ph.param_length = htons(SCTP_SIZE32(p_size));
2717                         memcpy(lookup->addr, &aa->ap.addrp.addr, addr_size);
2718                         SCTP_BUF_LEN(m_asconf_chk) += SCTP_SIZE32(p_size);
2719                         lookup_used = 1;
2720                 }
2721                 /* copy into current space */
2722                 memcpy(ptr, &aa->ap, p_length);
2723
2724                 /* network elements and update lengths */
2725                 aph = (struct sctp_asconf_paramhdr *)ptr;
2726                 aap = (struct sctp_asconf_addr_param *)ptr;
2727                 /* correlation_id is transparent to peer, no htonl needed */
2728                 aph->ph.param_type = htons(aph->ph.param_type);
2729                 aph->ph.param_length = htons(aph->ph.param_length);
2730                 aap->addrp.ph.param_type = htons(aap->addrp.ph.param_type);
2731                 aap->addrp.ph.param_length = htons(aap->addrp.ph.param_length);
2732
2733                 SCTP_BUF_LEN(m_asconf) += SCTP_SIZE32(p_length);
2734                 ptr += SCTP_SIZE32(p_length);
2735
2736                 /*
2737                  * these params are removed off the pending list upon
2738                  * getting an ASCONF-ACK back from the peer, just set flag
2739                  */
2740                 aa->sent = 1;
2741         }
2742         /* check to see if the lookup addr has been populated yet */
2743         if (lookup_used == 0) {
2744                 /* NOTE: if the address param is optional, can skip this... */
2745                 /* add any valid (existing) address... */
2746                 struct sctp_ipv6addr_param *lookup;
2747                 uint16_t p_size, addr_size;
2748                 struct sockaddr *found_addr;
2749                 caddr_t addr_ptr;
2750
2751                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL)
2752                         found_addr = sctp_find_valid_localaddr(stcb,
2753                             addr_locked);
2754                 else
2755                         found_addr = sctp_find_valid_localaddr_ep(stcb);
2756
2757                 lookup = (struct sctp_ipv6addr_param *)lookup_ptr;
2758                 if (found_addr != NULL) {
2759                         if (found_addr->sa_family == AF_INET6) {
2760                                 /* copy IPv6 address */
2761                                 lookup->ph.param_type =
2762                                     htons(SCTP_IPV6_ADDRESS);
2763                                 p_size = sizeof(struct sctp_ipv6addr_param);
2764                                 addr_size = sizeof(struct in6_addr);
2765                                 addr_ptr = (caddr_t)&((struct sockaddr_in6 *)
2766                                     found_addr)->sin6_addr;
2767                         } else {
2768                                 /* copy IPv4 address */
2769                                 lookup->ph.param_type =
2770                                     htons(SCTP_IPV4_ADDRESS);
2771                                 p_size = sizeof(struct sctp_ipv4addr_param);
2772                                 addr_size = sizeof(struct in_addr);
2773                                 addr_ptr = (caddr_t)&((struct sockaddr_in *)
2774                                     found_addr)->sin_addr;
2775                         }
2776                         lookup->ph.param_length = htons(SCTP_SIZE32(p_size));
2777                         memcpy(lookup->addr, addr_ptr, addr_size);
2778                         SCTP_BUF_LEN(m_asconf_chk) += SCTP_SIZE32(p_size);
2779                         lookup_used = 1;
2780                 } else {
2781                         /* uh oh... don't have any address?? */
2782                         SCTPDBG(SCTP_DEBUG_ASCONF1,
2783                             "compose_asconf: no lookup addr!\n");
2784                         /* for now, we send a IPv4 address of 0.0.0.0 */
2785                         lookup->ph.param_type = htons(SCTP_IPV4_ADDRESS);
2786                         lookup->ph.param_length = htons(SCTP_SIZE32(sizeof(struct sctp_ipv4addr_param)));
2787                         bzero(lookup->addr, sizeof(struct in_addr));
2788                         SCTP_BUF_LEN(m_asconf_chk) += SCTP_SIZE32(sizeof(struct sctp_ipv4addr_param));
2789                         lookup_used = 1;
2790                 }
2791         }
2792         /* chain it all together */
2793         SCTP_BUF_NEXT(m_asconf_chk) = m_asconf;
2794         *retlen = SCTP_BUF_LEN(m_asconf_chk) + SCTP_BUF_LEN(m_asconf);
2795         acp->ch.chunk_length = ntohs(*retlen);
2796
2797         return (m_asconf_chk);
2798 }
2799
2800 /*
2801  * section to handle address changes before an association is up eg. changes
2802  * during INIT/INIT-ACK/COOKIE-ECHO handshake
2803  */
2804
2805 /*
2806  * processes the (local) addresses in the INIT-ACK chunk
2807  */
2808 static void
2809 sctp_process_initack_addresses(struct sctp_tcb *stcb, struct mbuf *m,
2810     unsigned int offset, unsigned int length)
2811 {
2812         struct sctp_paramhdr tmp_param, *ph;
2813         uint16_t plen, ptype;
2814         struct sctp_ifa *sctp_ifa;
2815         struct sctp_ipv6addr_param addr_store;
2816         struct sockaddr_in6 sin6;
2817         struct sockaddr_in sin;
2818         struct sockaddr *sa;
2819         uint32_t vrf_id;
2820
2821         SCTPDBG(SCTP_DEBUG_ASCONF2, "processing init-ack addresses\n");
2822         if (stcb == NULL)       /* Un-needed check for SA */
2823                 return;
2824
2825         /* convert to upper bound */
2826         length += offset;
2827
2828         if ((offset + sizeof(struct sctp_paramhdr)) > length) {
2829                 return;
2830         }
2831         /* init the addresses */
2832         bzero(&sin6, sizeof(sin6));
2833         sin6.sin6_family = AF_INET6;
2834         sin6.sin6_len = sizeof(sin6);
2835         sin6.sin6_port = stcb->rport;
2836
2837         bzero(&sin, sizeof(sin));
2838         sin.sin_len = sizeof(sin);
2839         sin.sin_family = AF_INET;
2840         sin.sin_port = stcb->rport;
2841
2842         /* go through the addresses in the init-ack */
2843         ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset,
2844             sizeof(struct sctp_paramhdr), (uint8_t *) & tmp_param);
2845         while (ph != NULL) {
2846                 ptype = ntohs(ph->param_type);
2847                 plen = ntohs(ph->param_length);
2848                 if (ptype == SCTP_IPV6_ADDRESS) {
2849                         struct sctp_ipv6addr_param *a6p;
2850
2851                         /* get the entire IPv6 address param */
2852                         a6p = (struct sctp_ipv6addr_param *)
2853                             sctp_m_getptr(m, offset,
2854                             sizeof(struct sctp_ipv6addr_param),
2855                             (uint8_t *) & addr_store);
2856                         if (plen != sizeof(struct sctp_ipv6addr_param) ||
2857                             a6p == NULL) {
2858                                 return;
2859                         }
2860                         memcpy(&sin6.sin6_addr, a6p->addr,
2861                             sizeof(struct in6_addr));
2862                         sa = (struct sockaddr *)&sin6;
2863                 } else if (ptype == SCTP_IPV4_ADDRESS) {
2864                         struct sctp_ipv4addr_param *a4p;
2865
2866                         /* get the entire IPv4 address param */
2867                         a4p = (struct sctp_ipv4addr_param *)sctp_m_getptr(m, offset,
2868                             sizeof(struct sctp_ipv4addr_param),
2869                             (uint8_t *) & addr_store);
2870                         if (plen != sizeof(struct sctp_ipv4addr_param) ||
2871                             a4p == NULL) {
2872                                 return;
2873                         }
2874                         sin.sin_addr.s_addr = a4p->addr;
2875                         sa = (struct sockaddr *)&sin;
2876                 } else {
2877                         goto next_addr;
2878                 }
2879
2880                 /* see if this address really (still) exists */
2881                 if (stcb) {
2882                         vrf_id = stcb->asoc.vrf_id;
2883                 } else {
2884                         vrf_id = SCTP_DEFAULT_VRFID;
2885                 }
2886                 sctp_ifa = sctp_find_ifa_by_addr(sa, vrf_id,
2887                     SCTP_ADDR_NOT_LOCKED);
2888                 if (sctp_ifa == NULL) {
2889                         /* address doesn't exist anymore */
2890                         int status;
2891
2892                         /* are ASCONFs allowed ? */
2893                         if ((sctp_is_feature_on(stcb->sctp_ep,
2894                             SCTP_PCB_FLAGS_DO_ASCONF)) &&
2895                             stcb->asoc.peer_supports_asconf) {
2896                                 /* queue an ASCONF DEL_IP_ADDRESS */
2897                                 status = sctp_asconf_queue_sa_delete(stcb, sa);
2898                                 /*
2899                                  * if queued ok, and in correct state, send
2900                                  * out the ASCONF.
2901                                  */
2902                                 if (status == 0 &&
2903                                     SCTP_GET_STATE(&stcb->asoc) ==
2904                                     SCTP_STATE_OPEN) {
2905 #ifdef SCTP_TIMER_BASED_ASCONF
2906                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2907                                             stcb->sctp_ep, stcb,
2908                                             stcb->asoc.primary_destination);
2909 #else
2910                                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2911                                             SCTP_ADDR_NOT_LOCKED);
2912 #endif
2913                                 }
2914                         }
2915                 }
2916 next_addr:
2917                 /*
2918                  * Sanity check:  Make sure the length isn't 0, otherwise
2919                  * we'll be stuck in this loop for a long time...
2920                  */
2921                 if (SCTP_SIZE32(plen) == 0) {
2922                         SCTP_PRINTF("process_initack_addrs: bad len (%d) type=%xh\n",
2923                             plen, ptype);
2924                         return;
2925                 }
2926                 /* get next parameter */
2927                 offset += SCTP_SIZE32(plen);
2928                 if ((offset + sizeof(struct sctp_paramhdr)) > length)
2929                         return;
2930                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset,
2931                     sizeof(struct sctp_paramhdr), (uint8_t *) & tmp_param);
2932         }                       /* while */
2933 }
2934
2935 /* FIX ME: need to verify return result for v6 address type if v6 disabled */
2936 /*
2937  * checks to see if a specific address is in the initack address list returns
2938  * 1 if found, 0 if not
2939  */
2940 static uint32_t
2941 sctp_addr_in_initack(struct sctp_tcb *stcb, struct mbuf *m, uint32_t offset,
2942     uint32_t length, struct sockaddr *sa)
2943 {
2944         struct sctp_paramhdr tmp_param, *ph;
2945         uint16_t plen, ptype;
2946         struct sctp_ipv6addr_param addr_store;
2947         struct sockaddr_in *sin;
2948         struct sctp_ipv4addr_param *a4p;
2949
2950 #ifdef INET6
2951         struct sockaddr_in6 *sin6;
2952         struct sctp_ipv6addr_param *a6p;
2953         struct sockaddr_in6 sin6_tmp;
2954
2955 #endif                          /* INET6 */
2956
2957         if (
2958 #ifdef INET6
2959             (sa->sa_family != AF_INET6) &&
2960 #endif                          /* INET6 */
2961             (sa->sa_family != AF_INET))
2962                 return (0);
2963
2964         SCTPDBG(SCTP_DEBUG_ASCONF2, "find_initack_addr: starting search for ");
2965         SCTPDBG_ADDR(SCTP_DEBUG_ASCONF2, sa);
2966         /* convert to upper bound */
2967         length += offset;
2968
2969         if ((offset + sizeof(struct sctp_paramhdr)) > length) {
2970                 SCTPDBG(SCTP_DEBUG_ASCONF1,
2971                     "find_initack_addr: invalid offset?\n");
2972                 return (0);
2973         }
2974         /* go through the addresses in the init-ack */
2975         ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset,
2976             sizeof(struct sctp_paramhdr), (uint8_t *) & tmp_param);
2977         while (ph != NULL) {
2978                 ptype = ntohs(ph->param_type);
2979                 plen = ntohs(ph->param_length);
2980 #ifdef INET6
2981                 if (ptype == SCTP_IPV6_ADDRESS && sa->sa_family == AF_INET6) {
2982                         /* get the entire IPv6 address param */
2983                         a6p = (struct sctp_ipv6addr_param *)
2984                             sctp_m_getptr(m, offset,
2985                             sizeof(struct sctp_ipv6addr_param),
2986                             (uint8_t *) & addr_store);
2987                         if (plen != sizeof(struct sctp_ipv6addr_param) ||
2988                             (ph == NULL) ||
2989                             (a6p == NULL)) {
2990                                 return (0);
2991                         }
2992                         sin6 = (struct sockaddr_in6 *)sa;
2993                         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) {
2994                                 /* create a copy and clear scope */
2995                                 memcpy(&sin6_tmp, sin6,
2996                                     sizeof(struct sockaddr_in6));
2997                                 sin6 = &sin6_tmp;
2998                                 in6_clearscope(&sin6->sin6_addr);
2999                         }
3000                         if (memcmp(&sin6->sin6_addr, a6p->addr,
3001                             sizeof(struct in6_addr)) == 0) {
3002                                 /* found it */
3003                                 return (1);
3004                         }
3005                 } else
3006 #endif                          /* INET6 */
3007
3008                         if (ptype == SCTP_IPV4_ADDRESS &&
3009                     sa->sa_family == AF_INET) {
3010                         /* get the entire IPv4 address param */
3011                         a4p = (struct sctp_ipv4addr_param *)sctp_m_getptr(m,
3012                             offset, sizeof(struct sctp_ipv4addr_param),
3013                             (uint8_t *) & addr_store);
3014                         if (plen != sizeof(struct sctp_ipv4addr_param) ||
3015                             (ph == NULL) ||
3016                             (a4p == NULL)) {
3017                                 return (0);
3018                         }
3019                         sin = (struct sockaddr_in *)sa;
3020                         if (sin->sin_addr.s_addr == a4p->addr) {
3021                                 /* found it */
3022                                 return (1);
3023                         }
3024                 }
3025                 /* get next parameter */
3026                 offset += SCTP_SIZE32(plen);
3027                 if (offset + sizeof(struct sctp_paramhdr) > length)
3028                         return (0);
3029                 ph = (struct sctp_paramhdr *)
3030                     sctp_m_getptr(m, offset, sizeof(struct sctp_paramhdr),
3031                     (uint8_t *) & tmp_param);
3032         }                       /* while */
3033         /* not found! */
3034         return (0);
3035 }
3036
3037 /*
3038  * makes sure that the current endpoint local addr list is consistent with
3039  * the new association (eg. subset bound, asconf allowed) adds addresses as
3040  * necessary
3041  */
3042 static void
3043 sctp_check_address_list_ep(struct sctp_tcb *stcb, struct mbuf *m, int offset,
3044     int length, struct sockaddr *init_addr)
3045 {
3046         struct sctp_laddr *laddr;
3047
3048         /* go through the endpoint list */
3049         LIST_FOREACH(laddr, &stcb->sctp_ep->sctp_addr_list, sctp_nxt_addr) {
3050                 /* be paranoid and validate the laddr */
3051                 if (laddr->ifa == NULL) {
3052                         SCTPDBG(SCTP_DEBUG_ASCONF1,
3053                             "check_addr_list_ep: laddr->ifa is NULL");
3054                         continue;
3055                 }
3056                 if (laddr->ifa == NULL) {
3057                         SCTPDBG(SCTP_DEBUG_ASCONF1, "check_addr_list_ep: laddr->ifa->ifa_addr is NULL");
3058                         continue;
3059                 }
3060                 /* do i have it implicitly? */
3061                 if (sctp_cmpaddr(&laddr->ifa->address.sa, init_addr)) {
3062                         continue;
3063                 }
3064                 /* check to see if in the init-ack */
3065                 if (!sctp_addr_in_initack(stcb, m, offset, length,
3066                     &laddr->ifa->address.sa)) {
3067                         /* try to add it */
3068                         sctp_addr_mgmt_assoc(stcb->sctp_ep, stcb, laddr->ifa,
3069                             SCTP_ADD_IP_ADDRESS, SCTP_ADDR_NOT_LOCKED);
3070                 }
3071         }
3072 }
3073
3074 /*
3075  * makes sure that the current kernel address list is consistent with the new
3076  * association (with all addrs bound) adds addresses as necessary
3077  */
3078 static void
3079 sctp_check_address_list_all(struct sctp_tcb *stcb, struct mbuf *m, int offset,
3080     int length, struct sockaddr *init_addr,
3081     uint16_t local_scope, uint16_t site_scope,
3082     uint16_t ipv4_scope, uint16_t loopback_scope)
3083 {
3084         struct sctp_vrf *vrf = NULL;
3085         struct sctp_ifn *sctp_ifn;
3086         struct sctp_ifa *sctp_ifa;
3087         uint32_t vrf_id;
3088
3089         if (stcb) {
3090                 vrf_id = stcb->asoc.vrf_id;
3091         } else {
3092                 return;
3093         }
3094         SCTP_IPI_ADDR_RLOCK();
3095         vrf = sctp_find_vrf(vrf_id);
3096         if (vrf == NULL) {
3097                 SCTP_IPI_ADDR_RUNLOCK();
3098                 return;
3099         }
3100         /* go through all our known interfaces */
3101         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3102                 if (loopback_scope == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3103                         /* skip loopback interface */
3104                         continue;
3105                 }
3106                 /* go through each interface address */
3107                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3108                         /* do i have it implicitly? */
3109                         if (sctp_cmpaddr(&sctp_ifa->address.sa, init_addr)) {
3110                                 continue;
3111                         }
3112                         /* check to see if in the init-ack */
3113                         if (!sctp_addr_in_initack(stcb, m, offset, length,
3114                             &sctp_ifa->address.sa)) {
3115                                 /* try to add it */
3116                                 sctp_addr_mgmt_assoc(stcb->sctp_ep, stcb,
3117                                     sctp_ifa, SCTP_ADD_IP_ADDRESS,
3118                                     SCTP_ADDR_LOCKED);
3119                         }
3120                 }               /* end foreach ifa */
3121         }                       /* end foreach ifn */
3122         SCTP_IPI_ADDR_RUNLOCK();
3123 }
3124
3125 /*
3126  * validates an init-ack chunk (from a cookie-echo) with current addresses
3127  * adds addresses from the init-ack into our local address list, if needed
3128  * queues asconf adds/deletes addresses as needed and makes appropriate list
3129  * changes for source address selection m, offset: points to the start of the
3130  * address list in an init-ack chunk length: total length of the address
3131  * params only init_addr: address where my INIT-ACK was sent from
3132  */
3133 void
3134 sctp_check_address_list(struct sctp_tcb *stcb, struct mbuf *m, int offset,
3135     int length, struct sockaddr *init_addr,
3136     uint16_t local_scope, uint16_t site_scope,
3137     uint16_t ipv4_scope, uint16_t loopback_scope)
3138 {
3139         /* process the local addresses in the initack */
3140         sctp_process_initack_addresses(stcb, m, offset, length);
3141
3142         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3143                 /* bound all case */
3144                 sctp_check_address_list_all(stcb, m, offset, length, init_addr,
3145                     local_scope, site_scope, ipv4_scope, loopback_scope);
3146         } else {
3147                 /* subset bound case */
3148                 if (sctp_is_feature_on(stcb->sctp_ep,
3149                     SCTP_PCB_FLAGS_DO_ASCONF)) {
3150                         /* asconf's allowed */
3151                         sctp_check_address_list_ep(stcb, m, offset, length,
3152                             init_addr);
3153                 }
3154                 /* else, no asconfs allowed, so what we sent is what we get */
3155         }
3156 }
3157
3158 /*
3159  * sctp_bindx() support
3160  */
3161 uint32_t
3162 sctp_addr_mgmt_ep_sa(struct sctp_inpcb *inp, struct sockaddr *sa,
3163     uint32_t type, uint32_t vrf_id, struct sctp_ifa *sctp_ifap)
3164 {
3165         struct sctp_ifa *ifa;
3166
3167         if (sa->sa_len == 0) {
3168                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_ASCONF, EINVAL);
3169                 return (EINVAL);
3170         }
3171         if (sctp_ifap) {
3172                 ifa = sctp_ifap;
3173         } else if (type == SCTP_ADD_IP_ADDRESS) {
3174                 /* For an add the address MUST be on the system */
3175                 ifa = sctp_find_ifa_by_addr(sa, vrf_id, SCTP_ADDR_NOT_LOCKED);
3176         } else if (type == SCTP_DEL_IP_ADDRESS) {
3177                 /* For a delete we need to find it in the inp */
3178                 ifa = sctp_find_ifa_in_ep(inp, sa, SCTP_ADDR_NOT_LOCKED);
3179         } else {
3180                 ifa = NULL;
3181         }
3182         if (ifa != NULL) {
3183                 if (type == SCTP_ADD_IP_ADDRESS) {
3184                         sctp_add_local_addr_ep(inp, ifa, type);
3185                 } else if (type == SCTP_DEL_IP_ADDRESS) {
3186                         struct sctp_laddr *laddr;
3187
3188                         if (inp->laddr_count < 2) {
3189                                 /* can't delete the last local address */
3190                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_ASCONF, EINVAL);
3191                                 return (EINVAL);
3192                         }
3193                         LIST_FOREACH(laddr, &inp->sctp_addr_list,
3194                             sctp_nxt_addr) {
3195                                 if (ifa == laddr->ifa) {
3196                                         /* Mark in the delete */
3197                                         laddr->action = type;
3198                                 }
3199                         }
3200                 }
3201                 if (!LIST_EMPTY(&inp->sctp_asoc_list)) {
3202                         /*
3203                          * There is no need to start the iterator if the inp
3204                          * has no associations.
3205                          */
3206                         struct sctp_asconf_iterator *asc;
3207                         struct sctp_laddr *wi;
3208
3209                         SCTP_MALLOC(asc, struct sctp_asconf_iterator *,
3210                             sizeof(struct sctp_asconf_iterator),
3211                             SCTP_M_ASC_IT);
3212                         if (asc == NULL) {
3213                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_ASCONF, ENOMEM);
3214                                 return (ENOMEM);
3215                         }
3216                         wi = SCTP_ZONE_GET(SCTP_BASE_INFO(ipi_zone_laddr), struct sctp_laddr);
3217                         if (wi == NULL) {
3218                                 SCTP_FREE(asc, SCTP_M_ASC_IT);
3219                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_ASCONF, ENOMEM);
3220                                 return (ENOMEM);
3221                         }
3222                         LIST_INIT(&asc->list_of_work);
3223                         asc->cnt = 1;
3224                         SCTP_INCR_LADDR_COUNT();
3225                         wi->ifa = ifa;
3226                         wi->action = type;
3227                         atomic_add_int(&ifa->refcount, 1);
3228                         LIST_INSERT_HEAD(&asc->list_of_work, wi, sctp_nxt_addr);
3229                         (void)sctp_initiate_iterator(sctp_asconf_iterator_ep,
3230                             sctp_asconf_iterator_stcb,
3231                             sctp_asconf_iterator_ep_end,
3232                             SCTP_PCB_ANY_FLAGS,
3233                             SCTP_PCB_ANY_FEATURES,
3234                             SCTP_ASOC_ANY_STATE,
3235                             (void *)asc, 0,
3236                             sctp_asconf_iterator_end, inp, 0);
3237                 }
3238                 return (0);
3239         } else {
3240                 /* invalid address! */
3241                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_ASCONF, EADDRNOTAVAIL);
3242                 return (EADDRNOTAVAIL);
3243         }
3244 }
3245
3246 void
3247 sctp_asconf_send_nat_state_update(struct sctp_tcb *stcb,
3248     struct sctp_nets *net)
3249 {
3250         struct sctp_asconf_addr *aa;
3251         struct sctp_ifa *sctp_ifap;
3252         struct sctp_asconf_tag_param *vtag;
3253         struct sockaddr_in *to;
3254
3255 #ifdef INET6
3256         struct sockaddr_in6 *to6;
3257
3258 #endif
3259         if (net == NULL) {
3260                 SCTPDBG(SCTP_DEBUG_ASCONF1, "sctp_asconf_send_nat_state_update: Missing net\n");
3261                 return;
3262         }
3263         if (stcb == NULL) {
3264                 SCTPDBG(SCTP_DEBUG_ASCONF1, "sctp_asconf_send_nat_state_update: Missing stcb\n");
3265                 return;
3266         }
3267         /*
3268          * Need to have in the asconf: - vtagparam(my_vtag/peer_vtag) -
3269          * add(0.0.0.0) - del(0.0.0.0) - Any global addresses add(addr)
3270          */
3271         SCTP_MALLOC(aa, struct sctp_asconf_addr *, sizeof(*aa),
3272             SCTP_M_ASC_ADDR);
3273         if (aa == NULL) {
3274                 /* didn't get memory */
3275                 SCTPDBG(SCTP_DEBUG_ASCONF1,
3276                     "sctp_asconf_send_nat_state_update: failed to get memory!\n");
3277                 return;
3278         }
3279         aa->special_del = 0;
3280         /* fill in asconf address parameter fields */
3281         /* top level elements are "networked" during send */
3282         aa->ifa = NULL;
3283         aa->sent = 0;           /* clear sent flag */
3284         vtag = (struct sctp_asconf_tag_param *)&aa->ap.aph;
3285         vtag->aph.ph.param_type = SCTP_NAT_VTAGS;
3286         vtag->aph.ph.param_length = sizeof(struct sctp_asconf_tag_param);
3287         vtag->local_vtag = htonl(stcb->asoc.my_vtag);
3288         vtag->remote_vtag = htonl(stcb->asoc.peer_vtag);
3289         TAILQ_INSERT_TAIL(&stcb->asoc.asconf_queue, aa, next);
3290
3291         SCTP_MALLOC(aa, struct sctp_asconf_addr *, sizeof(*aa),
3292             SCTP_M_ASC_ADDR);
3293         if (aa == NULL) {
3294                 /* didn't get memory */
3295                 SCTPDBG(SCTP_DEBUG_ASCONF1,
3296                     "sctp_asconf_send_nat_state_update: failed to get memory!\n");
3297                 return;
3298         }
3299         memset(aa, 0, sizeof(struct sctp_asconf_addr));
3300         /* fill in asconf address parameter fields */
3301         /* ADD(0.0.0.0) */
3302         if (net->ro._l_addr.sa.sa_family == AF_INET) {
3303                 aa->ap.aph.ph.param_type = SCTP_ADD_IP_ADDRESS;
3304                 aa->ap.aph.ph.param_length = sizeof(struct sctp_asconf_addrv4_param);
3305                 aa->ap.addrp.ph.param_type = SCTP_IPV4_ADDRESS;
3306                 aa->ap.addrp.ph.param_length = sizeof(struct sctp_ipv4addr_param);
3307                 /* No need to add an address, we are using 0.0.0.0 */
3308                 TAILQ_INSERT_TAIL(&stcb->asoc.asconf_queue, aa, next);
3309         }
3310 #ifdef INET6
3311         else if (net->ro._l_addr.sa.sa_family == AF_INET6) {
3312                 aa->ap.aph.ph.param_type = SCTP_ADD_IP_ADDRESS;
3313                 aa->ap.aph.ph.param_length = sizeof(struct sctp_asconf_addr_param);
3314                 aa->ap.addrp.ph.param_type = SCTP_IPV6_ADDRESS;
3315                 aa->ap.addrp.ph.param_length = sizeof(struct sctp_ipv6addr_param);
3316                 /* No need to add an address, we are using 0.0.0.0 */
3317                 TAILQ_INSERT_TAIL(&stcb->asoc.asconf_queue, aa, next);
3318         }
3319 #endif                          /* INET6 */
3320         SCTP_MALLOC(aa, struct sctp_asconf_addr *, sizeof(*aa),
3321             SCTP_M_ASC_ADDR);
3322         if (aa == NULL) {
3323                 /* didn't get memory */
3324                 SCTPDBG(SCTP_DEBUG_ASCONF1,
3325                     "sctp_asconf_send_nat_state_update: failed to get memory!\n");
3326                 return;
3327         }
3328         memset(aa, 0, sizeof(struct sctp_asconf_addr));
3329         /* fill in asconf address parameter fields */
3330         /* ADD(0.0.0.0) */
3331         if (net->ro._l_addr.sa.sa_family == AF_INET) {
3332                 aa->ap.aph.ph.param_type = SCTP_ADD_IP_ADDRESS;
3333                 aa->ap.aph.ph.param_length = sizeof(struct sctp_asconf_addrv4_param);
3334                 aa->ap.addrp.ph.param_type = SCTP_IPV4_ADDRESS;
3335                 aa->ap.addrp.ph.param_length = sizeof(struct sctp_ipv4addr_param);
3336                 /* No need to add an address, we are using 0.0.0.0 */
3337                 TAILQ_INSERT_TAIL(&stcb->asoc.asconf_queue, aa, next);
3338         }
3339 #ifdef INET6
3340         else if (net->ro._l_addr.sa.sa_family == AF_INET6) {
3341                 aa->ap.aph.ph.param_type = SCTP_DEL_IP_ADDRESS;
3342                 aa->ap.aph.ph.param_length = sizeof(struct sctp_asconf_addr_param);
3343                 aa->ap.addrp.ph.param_type = SCTP_IPV6_ADDRESS;
3344                 aa->ap.addrp.ph.param_length = sizeof(struct sctp_ipv6addr_param);
3345                 /* No need to add an address, we are using 0.0.0.0 */
3346                 TAILQ_INSERT_TAIL(&stcb->asoc.asconf_queue, aa, next);
3347         }
3348 #endif                          /* INET6 */
3349         /* Now we must hunt the addresses and add all global addresses */
3350         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3351                 struct sctp_vrf *vrf = NULL;
3352                 struct sctp_ifn *sctp_ifnp;
3353                 uint32_t vrf_id;
3354
3355                 vrf_id = stcb->sctp_ep->def_vrf_id;
3356                 vrf = sctp_find_vrf(vrf_id);
3357                 if (vrf == NULL) {
3358                         goto skip_rest;
3359                 }
3360                 SCTP_IPI_ADDR_RLOCK();
3361                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
3362                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
3363                                 if (sctp_ifap->address.sa.sa_family == AF_INET) {
3364                                         to = &sctp_ifap->address.sin;
3365
3366                                         if (IN4_ISPRIVATE_ADDRESS(&to->sin_addr)) {
3367                                                 continue;
3368                                         }
3369                                         if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3370                                                 continue;
3371                                         }
3372                                 }
3373 #ifdef INET6
3374                                 else if (sctp_ifap->address.sa.sa_family == AF_INET6) {
3375                                         to6 = &sctp_ifap->address.sin6;
3376                                         if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr)) {
3377                                                 continue;
3378                                         }
3379                                         if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3380                                                 continue;
3381                                         }
3382                                 }
3383 #endif
3384                                 sctp_asconf_queue_mgmt(stcb, sctp_ifap, SCTP_ADD_IP_ADDRESS);
3385                         }
3386                 }
3387                 SCTP_IPI_ADDR_RUNLOCK();
3388         } else {
3389                 struct sctp_laddr *laddr;
3390
3391                 LIST_FOREACH(laddr, &stcb->sctp_ep->sctp_addr_list, sctp_nxt_addr) {
3392                         if (laddr->ifa == NULL) {
3393                                 continue;
3394                         }
3395                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
3396                                 /*
3397                                  * Address being deleted by the system, dont
3398                                  * list.
3399                                  */
3400                                 continue;
3401                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
3402                                 /*
3403                                  * Address being deleted on this ep don't
3404                                  * list.
3405                                  */
3406                                 continue;
3407                         }
3408                         sctp_ifap = laddr->ifa;
3409                         if (sctp_ifap->address.sa.sa_family == AF_INET) {
3410                                 to = &sctp_ifap->address.sin;
3411
3412                                 if (IN4_ISPRIVATE_ADDRESS(&to->sin_addr)) {
3413                                         continue;
3414                                 }
3415                                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3416                                         continue;
3417                                 }
3418                         }
3419 #ifdef INET6
3420                         else if (sctp_ifap->address.sa.sa_family == AF_INET6) {
3421                                 to6 = &sctp_ifap->address.sin6;
3422                                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr)) {
3423                                         continue;
3424                                 }
3425                                 if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3426                                         continue;
3427                                 }
3428                         }
3429 #endif
3430                         sctp_asconf_queue_mgmt(stcb, sctp_ifap, SCTP_ADD_IP_ADDRESS);
3431                 }
3432         }
3433 skip_rest:
3434         /* Now we must send the asconf into the queue */
3435         sctp_send_asconf(stcb, net, 0);
3436 }