lib/libsctp/sctp_sys_calls.c

   1 /*      $KAME: sctp_sys_calls.c,v 1.9 2004/08/17 06:08:53 itojun Exp $ */
   2 /*      $DragonFly: src/lib/libsctp/sctp_sys_calls.c,v 1.3 2008/09/30 16:57:05 swildner Exp $   */
   3
   4 /*
   5  * Copyright (C) 2002, 2003, 2004 Cisco Systems Inc,
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the project nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #include <stdio.h>
  34 #include <string.h>
  35 #include <errno.h>
  36 #include <stdlib.h>
  37 #include <unistd.h>
  38 #include <sys/types.h>
  39 #include <sys/socket.h>
  40 #include <sys/errno.h>
  41 #include <sys/syscall.h>
  42 #include <sys/uio.h>
  43 #include <netinet/in.h>
  44 #include <arpa/inet.h>
  45 #include <netinet/sctp_uio.h>
  46 #include <netinet/sctp.h>
  47 #include <netinet/sctp_constants.h>
  48
  49 #include <net/if_dl.h>
  50
  51 #ifndef IN6_IS_ADDR_V4MAPPED
  52 #define IN6_IS_ADDR_V4MAPPED(a)              \
  53         ((*(const u_int32_t *)(const void *)(&(a)->s6_addr[0]) == 0) && \
  54          (*(const u_int32_t *)(const void *)(&(a)->s6_addr[4]) == 0) && \
  55          (*(const u_int32_t *)(const void *)(&(a)->s6_addr[8]) == ntohl(0x0000ffff)))
  56 #endif
  57
  58
  59 #ifdef SCTP_DEBUG_PRINT_ADDRESS
  60 static void
  61 SCTPPrintAnAddress(struct sockaddr *a)
  62 {
  63         char stringToPrint[256];
  64         u_short prt;
  65         char *srcaddr, *txt;
  66
  67         if (a == NULL) {
  68                 printf("NULL\n");
  69                 return;
  70         }
  71         if (a->sa_family == AF_INET) {
  72                 srcaddr = (char *)&((struct sockaddr_in *)a)->sin_addr;
  73                 txt = "IPv4 Address: ";
  74                 prt = ntohs(((struct sockaddr_in *)a)->sin_port);
  75         } else if (a->sa_family == AF_INET6) {
  76                 srcaddr = (char *)&((struct sockaddr_in6 *)a)->sin6_addr;
  77                 prt = ntohs(((struct sockaddr_in6 *)a)->sin6_port);
  78                 txt = "IPv6 Address: ";
  79         } else if (a->sa_family == AF_LINK) {
  80                 int i;
  81                 char tbuf[200];
  82                 u_char adbuf[200];
  83                 struct sockaddr_dl *dl;
  84
  85                 dl = (struct sockaddr_dl *)a;
  86                 strncpy(tbuf, dl->sdl_data, dl->sdl_nlen);
  87                 tbuf[dl->sdl_nlen] = 0;
  88                 printf("Intf:%s (len:%d)Interface index:%d type:%x(%d) ll-len:%d ",
  89                     tbuf, dl->sdl_nlen, dl->sdl_index, dl->sdl_type,
  90                     dl->sdl_type, dl->sdl_alen);
  91                 memcpy(adbuf, LLADDR(dl), dl->sdl_alen);
  92                 for (i = 0; i < dl->sdl_alen; i++){
  93                         printf("%2.2x", adbuf[i]);
  94                         if (i < (dl->sdl_alen - 1))
  95                                 printf(":");
  96                 }
  97                 printf("\n");
  98         /*      u_short sdl_route[16];*/        /* source routing information */
  99                 return;
 100         } else {
 101                 return;
 102         }
 103         if (inet_ntop(a->sa_family, srcaddr, stringToPrint,
 104             sizeof(stringToPrint))) {
 105                 if (a->sa_family == AF_INET6) {
 106                         printf("%s%s:%d scope:%d\n", txt, stringToPrint, prt,
 107                             ((struct sockaddr_in6 *)a)->sin6_scope_id);
 108                 } else {
 109                         printf("%s%s:%d\n", txt, stringToPrint, prt);
 110                 }
 111
 112         } else {
 113                 printf("%s unprintable?\n", txt);
 114         }
 115 }
 116 #endif /* SCTP_DEBUG_PRINT_ADDRESS */
 117
 118 static void
 119 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
 120 {
 121         bzero(sin, sizeof(*sin));
 122         sin->sin_len = sizeof(struct sockaddr_in);
 123         sin->sin_family = AF_INET;
 124         sin->sin_port = sin6->sin6_port;
 125         sin->sin_addr.s_addr = sin6->sin6_addr.__u6_addr.__u6_addr32[3];
 126 }
 127
 128 int
 129 sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt)
 130 {
 131         char buf[2048];
 132         int i, ret, cnt, *aa;
 133         char *cpto;
 134         struct sockaddr *at;
 135         size_t len = sizeof(int);
 136
 137         at = addrs;
 138         cnt = 0;
 139         cpto = ((caddr_t)buf + sizeof(int));
 140         /* validate all the addresses and get the size */
 141         for (i = 0; i < addrcnt; i++) {
 142                 if (at->sa_family == AF_INET) {
 143                         memcpy(cpto, at, at->sa_len);
 144                         cpto = ((caddr_t)cpto + at->sa_len);
 145                         len += at->sa_len;
 146                 } else if (at->sa_family == AF_INET6){
 147                         if (IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)at)->sin6_addr)){
 148                                 len += sizeof(struct sockaddr_in);
 149                                 in6_sin6_2_sin((struct sockaddr_in *)cpto,
 150                                     (struct sockaddr_in6 *)at);
 151                                 cpto = ((caddr_t)cpto + sizeof(struct sockaddr_in));
 152                                 len += sizeof(struct sockaddr_in);
 153                         } else {
 154                                 memcpy(cpto, at, at->sa_len);
 155                                 cpto = ((caddr_t)cpto + at->sa_len);
 156                                 len += at->sa_len;
 157                         }
 158                 } else {
 159                         errno = EINVAL;
 160                         return (-1);
 161                 }
 162                 if (len > (sizeof(buf)-sizeof(int))) {
 163                         /* Never enough memory */
 164                         return(E2BIG);
 165                 }
 166                 at = (struct sockaddr *)((caddr_t)at + at->sa_len);
 167                 cnt++;
 168         }
 169         /* do we have any? */
 170         if (cnt == 0) {
 171                 errno = EINVAL;
 172                 return(-1);
 173         }
 174         aa = (int *)buf;
 175         *aa = cnt;
 176         ret = setsockopt(sd, IPPROTO_SCTP, SCTP_CONNECT_X, (void *)buf,
 177             (unsigned int)len);
 178         return (ret);
 179 }
 180
 181 int
 182 sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt, int flags)
 183 {
 184         struct sctp_getaddresses *gaddrs;
 185         struct sockaddr *sa;
 186         int i, sz, fam, argsz;
 187
 188         if ((flags != SCTP_BINDX_ADD_ADDR) &&
 189             (flags != SCTP_BINDX_REM_ADDR)) {
 190                 errno = EFAULT;
 191                 return(-1);
 192         }
 193         argsz = (sizeof(struct sockaddr_storage) +
 194             sizeof(struct sctp_getaddresses));
 195         gaddrs = (struct sctp_getaddresses *)calloc(1, argsz);
 196         if (gaddrs == NULL) {
 197                 errno = ENOMEM;
 198                 return(-1);
 199         }
 200         gaddrs->sget_assoc_id = 0;
 201         sa = addrs;
 202         for (i = 0; i < addrcnt; i++) {
 203                 sz = sa->sa_len;
 204                 fam = sa->sa_family;
 205                 ((struct sockaddr_in *)&addrs[i])->sin_port = ((struct sockaddr_in *)sa)->sin_port;
 206                 if ((fam != AF_INET) && (fam != AF_INET6)) {
 207                         errno = EINVAL;
 208                         return(-1);
 209                 }
 210                 memcpy(gaddrs->addr, sa, sz);
 211                 if (setsockopt(sd, IPPROTO_SCTP, flags, gaddrs,
 212                     (unsigned int)argsz) != 0) {
 213                         free(gaddrs);
 214                         return(-1);
 215                 }
 216                 memset(gaddrs, 0, argsz);
 217                 sa = (struct sockaddr *)((caddr_t)sa + sz);
 218         }
 219         free(gaddrs);
 220         return(0);
 221 }
 222
 223
 224 int
 225 sctp_opt_info(int sd, sctp_assoc_t id, int opt, void *arg, size_t *size)
 226 {
 227         if ((opt == SCTP_RTOINFO) ||
 228             (opt == SCTP_ASSOCINFO) ||
 229             (opt == SCTP_PRIMARY_ADDR) ||
 230             (opt == SCTP_SET_PEER_PRIMARY_ADDR) ||
 231             (opt == SCTP_PEER_ADDR_PARAMS) ||
 232             (opt == SCTP_STATUS) ||
 233             (opt == SCTP_GET_PEER_ADDR_INFO)) {
 234                 *(sctp_assoc_t *)arg = id;
 235                 return(getsockopt(sd, IPPROTO_SCTP, opt, arg, (int *)size));
 236         } else {
 237                 errno = EOPNOTSUPP;
 238                 return(-1);
 239         }
 240 }
 241
 242 int
 243 sctp_getpaddrs(int sd, sctp_assoc_t id, struct sockaddr **raddrs)
 244 {
 245         struct sctp_getaddresses *addrs;
 246         struct sockaddr *sa;
 247         struct sockaddr *re;
 248         sctp_assoc_t asoc;
 249         caddr_t lim;
 250         unsigned int siz;
 251         int cnt;
 252
 253         if (raddrs == NULL) {
 254                 errno = EFAULT;
 255                 return(-1);
 256         }
 257         asoc = id;
 258         siz = sizeof(sctp_assoc_t);
 259         if (getsockopt(sd, IPPROTO_SCTP, SCTP_GET_REMOTE_ADDR_SIZE,
 260             &asoc, &siz) != 0) {
 261                 return(-1);
 262         }
 263         siz = (unsigned int)(uintptr_t)asoc;
 264         siz += sizeof(struct sctp_getaddresses);
 265         addrs = calloc((unsigned long)1, (unsigned long)siz);
 266         if (addrs == NULL) {
 267                 errno = ENOMEM;
 268                 return(-1);
 269         }
 270         memset(addrs, 0, (size_t)siz);
 271         addrs->sget_assoc_id = id;
 272         /* Now lets get the array of addresses */
 273         if (getsockopt(sd, IPPROTO_SCTP, SCTP_GET_PEER_ADDRESSES,
 274             addrs, &siz) != 0) {
 275                 free(addrs);
 276                 return(-1);
 277         }
 278         re = (struct sockaddr *)&addrs->addr[0];
 279         *raddrs = re;
 280         cnt = 0;
 281         sa = (struct sockaddr *)&addrs->addr[0];
 282         lim = (caddr_t)addrs + siz;
 283         while ((caddr_t)sa < lim) {
 284                 cnt++;
 285                 sa = (struct sockaddr *)((caddr_t)sa + sa->sa_len);
 286                 if (sa->sa_len == 0)
 287                         break;
 288         }
 289         return(cnt);
 290 }
 291
 292 void sctp_freepaddrs(struct sockaddr *addrs)
 293 {
 294         /* Take away the hidden association id */
 295         void *fr_addr;
 296         fr_addr = (void *)((caddr_t)addrs - sizeof(sctp_assoc_t));
 297         /* Now free it */
 298         free(fr_addr);
 299 }
 300
 301 int
 302 sctp_getladdrs (int sd, sctp_assoc_t id, struct sockaddr **raddrs)
 303 {
 304         struct sctp_getaddresses *addrs;
 305         struct sockaddr *re;
 306         caddr_t lim;
 307         struct sockaddr *sa;
 308         int size_of_addresses;
 309         unsigned int siz;
 310         int cnt;
 311
 312         if (raddrs == NULL) {
 313                 errno = EFAULT;
 314                 return(-1);
 315         }
 316         size_of_addresses = 0;
 317         siz = sizeof(int);
 318         if (getsockopt(sd, IPPROTO_SCTP, SCTP_GET_LOCAL_ADDR_SIZE,
 319             &size_of_addresses, &siz) != 0) {
 320                 return(-1);
 321         }
 322         if (size_of_addresses == 0) {
 323                 errno = ENOTCONN;
 324                 return(-1);
 325         }
 326         siz = size_of_addresses + sizeof(struct sockaddr_storage);
 327         siz += sizeof(struct sctp_getaddresses);
 328         addrs = calloc((unsigned long)1, (unsigned long)siz);
 329         if (addrs == NULL) {
 330                 errno = ENOMEM;
 331                 return(-1);
 332         }
 333         memset(addrs, 0, (size_t)siz);
 334         addrs->sget_assoc_id = id;
 335         /* Now lets get the array of addresses */
 336         if (getsockopt(sd, IPPROTO_SCTP, SCTP_GET_LOCAL_ADDRESSES, addrs,
 337             &siz) != 0) {
 338                 free(addrs);
 339                 return(-1);
 340         }
 341         re = (struct sockaddr *)&addrs->addr[0];
 342         *raddrs = re;
 343         cnt = 0;
 344         sa = (struct sockaddr *)&addrs->addr[0];
 345         lim = (caddr_t)addrs + siz;
 346         while ((caddr_t)sa < lim) {
 347                 cnt++;
 348                 sa = (struct sockaddr *)((caddr_t)sa + sa->sa_len);
 349                 if (sa->sa_len == 0)
 350                         break;
 351         }
 352         return(cnt);
 353 }
 354
 355 void sctp_freeladdrs(struct sockaddr *addrs)
 356 {
 357         /* Take away the hidden association id */
 358         void *fr_addr;
 359         fr_addr = (void *)((caddr_t)addrs - sizeof(sctp_assoc_t));
 360         /* Now free it */
 361         free(fr_addr);
 362 }
 363
 364
 365 ssize_t
 366 sctp_sendmsg(int s,
 367              const void *data,
 368              size_t len,
 369              const struct sockaddr *to,
 370              socklen_t tolen __attribute__((unused)),
 371              u_int32_t ppid,
 372              u_int32_t flags,
 373              u_int16_t stream_no,
 374              u_int32_t timetolive,
 375              u_int32_t context)
 376 {
 377         ssize_t sz;
 378         struct msghdr msg;
 379         struct iovec iov[2];
 380         char controlVector[256];
 381         struct sctp_sndrcvinfo *s_info;
 382         struct cmsghdr *cmsg;
 383         struct sockaddr *who=NULL;
 384         union {
 385                 struct sockaddr_in in;
 386                 struct sockaddr_in6 in6;
 387         } addr;
 388
 389 #if 0
 390         fprintf(io, "sctp_sendmsg(sd:%d, data:%x, len:%d, to:%x, tolen:%d, ppid:%x, flags:%x str:%d ttl:%d ctx:%x\n",
 391             s, (u_int)data, (int)len, (u_int)to, (int)tolen, ppid, flags,
 392             (int)stream_no, (int)timetolive, (u_int)context);
 393         fflush(io);
 394 #endif
 395         if (to) {
 396                 if (to->sa_len == 0) {
 397                         /*
 398                          * For the lazy app, that did not
 399                          * set sa_len, we attempt to set for them.
 400                          */
 401                         if (to->sa_family == AF_INET){
 402                                 memcpy(&addr, to, sizeof(struct sockaddr_in));
 403                                 addr.in.sin_len = sizeof(struct sockaddr_in);
 404                         } else if (to->sa_family == AF_INET6){
 405                                 memcpy(&addr, to, sizeof(struct sockaddr_in6));
 406                                 addr.in6.sin6_len = sizeof(struct sockaddr_in6);
 407                         }
 408                 } else {
 409                         memcpy (&addr, to, to->sa_len);
 410                 }
 411                 who = (struct sockaddr *)&addr;
 412         }
 413         iov[0].iov_base = (char *)data;
 414         iov[0].iov_len = len;
 415         iov[1].iov_base = NULL;
 416         iov[1].iov_len = 0;
 417
 418         if (to) {
 419                 msg.msg_name = (caddr_t)who;
 420                 msg.msg_namelen = who->sa_len;
 421         } else {
 422                 msg.msg_name = (caddr_t)NULL;
 423                 msg.msg_namelen = 0;
 424         }
 425         msg.msg_iov = iov;
 426         msg.msg_iovlen = 1;
 427         msg.msg_control = (caddr_t)controlVector;
 428
 429         cmsg = (struct cmsghdr *)controlVector;
 430
 431         cmsg->cmsg_level = IPPROTO_SCTP;
 432         cmsg->cmsg_type = SCTP_SNDRCV;
 433         cmsg->cmsg_len = CMSG_LEN (sizeof(struct sctp_sndrcvinfo) );
 434         s_info = (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg);
 435
 436         s_info->sinfo_stream = stream_no;
 437         s_info->sinfo_ssn = 0;
 438         s_info->sinfo_flags = flags;
 439         s_info->sinfo_ppid = ppid;
 440         s_info->sinfo_context = context;
 441         s_info->sinfo_assoc_id = 0;
 442         s_info->sinfo_timetolive = timetolive;
 443         errno = 0;
 444         msg.msg_controllen = cmsg->cmsg_len;
 445         sz = sendmsg(s, &msg, 0);
 446         return(sz);
 447 }
 448
 449 sctp_assoc_t
 450 sctp_getassocid(int sd, struct sockaddr *sa)
 451 {
 452         struct sctp_paddrparams sp;
 453         int siz;
 454
 455         /* First get the assoc id */
 456         siz = sizeof(struct sctp_paddrparams);
 457         memset(&sp, 0, sizeof(sp));
 458         memcpy((caddr_t)&sp.spp_address, sa, sa->sa_len);
 459         errno = 0;
 460         if (getsockopt(sd, IPPROTO_SCTP, SCTP_PEER_ADDR_PARAMS, &sp, &siz) != 0)
 461                 return((sctp_assoc_t)0);
 462         /* We depend on the fact that 0 can never be returned */
 463         return(sp.spp_assoc_id);
 464 }
 465
 466
 467
 468 ssize_t
 469 sctp_send(int sd, const void *data, size_t len,
 470           const struct sctp_sndrcvinfo *sinfo,
 471           int flags)
 472 {
 473         ssize_t sz;
 474         struct msghdr msg;
 475         struct iovec iov[2];
 476         struct sctp_sndrcvinfo *s_info;
 477         char controlVector[256];
 478         struct cmsghdr *cmsg;
 479
 480         iov[0].iov_base = (char *)data;
 481         iov[0].iov_len = len;
 482         iov[1].iov_base = NULL;
 483         iov[1].iov_len = 0;
 484
 485         msg.msg_name = 0;
 486         msg.msg_namelen = 0;
 487         msg.msg_iov = iov;
 488         msg.msg_iovlen = 1;
 489         msg.msg_control = (caddr_t)controlVector;
 490
 491         cmsg = (struct cmsghdr *)controlVector;
 492
 493         cmsg->cmsg_level = IPPROTO_SCTP;
 494         cmsg->cmsg_type = SCTP_SNDRCV;
 495         cmsg->cmsg_len = CMSG_LEN (sizeof(struct sctp_sndrcvinfo) );
 496         s_info = (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg);
 497         /* copy in the data */
 498         *s_info = *sinfo;
 499         errno = 0;
 500         msg.msg_controllen = cmsg->cmsg_len;
 501         sz = sendmsg(sd, &msg, flags);
 502         return(sz);
 503 }
 504
 505
 506 ssize_t
 507 sctp_sendx(int sd, const void *msg, size_t len,
 508            struct sockaddr *addrs, int addrcnt,
 509            struct sctp_sndrcvinfo *sinfo,
 510            int flags)
 511 {
 512         int i, cnt, *aa, saved_errno;
 513         ssize_t ret;
 514         char *buf;
 515         int add_len;
 516         struct sockaddr *at;
 517         len = sizeof(int);
 518         at = addrs;
 519         cnt = 0;
 520         /* validate all the addresses and get the size */
 521         for (i = 0; i < addrcnt; i++) {
 522                 if (at->sa_family == AF_INET) {
 523                         add_len = sizeof(struct sockaddr_in);
 524                 } else if (at->sa_family == AF_INET6) {
 525                         add_len = sizeof(struct sockaddr_in6);
 526                 } else {
 527                         errno = EINVAL;
 528                         return (-1);
 529                 }
 530                 len += add_len;
 531                 at = (struct sockaddr *)((caddr_t)at + add_len);
 532                 cnt++;
 533         }
 534         /* do we have any? */
 535         if (cnt == 0) {
 536                 errno = EINVAL;
 537                 return(-1);
 538         }
 539         if (len > 2048) {
 540                 /* Never enough memory */
 541                 errno = E2BIG;
 542                 return(-1);
 543         }
 544         buf = malloc(len);
 545         if (buf == NULL) {
 546                 errno = ENOMEM;
 547                 return(-1);
 548         }
 549         aa = (int *)buf;
 550         *aa = cnt;
 551         aa++;
 552         memcpy((caddr_t)aa, addrs, (len - sizeof(int)));
 553         ret = setsockopt(sd, IPPROTO_SCTP, SCTP_CONNECT_X_DELAYED, (void *)buf,
 554             (unsigned int)len);
 555
 556         free(buf);
 557         if (ret != 0) {
 558                 return(ret);
 559         }
 560         sinfo->sinfo_assoc_id = sctp_getassocid(sd, addrs);
 561         if (sinfo->sinfo_assoc_id == 0) {
 562                 printf("Huh, can't get associd? TSNH!\n");
 563                 (void)setsockopt(sd, IPPROTO_SCTP, SCTP_CONNECT_X_COMPLETE, (void *)addrs,
 564                                  (unsigned int)addrs->sa_len);
 565                 errno = ENOENT;
 566                 return (-1);
 567         }
 568         ret = sctp_send(sd, msg, len, sinfo, flags);
 569         saved_errno = errno;
 570         (void)setsockopt(sd, IPPROTO_SCTP, SCTP_CONNECT_X_COMPLETE, (void *)addrs,
 571                          (unsigned int)addrs->sa_len);
 572
 573         errno = saved_errno;
 574         return (ret);
 575 }
 576
 577 ssize_t
 578 sctp_sendmsgx(int sd,
 579               const void *msg,
 580               size_t len,
 581               struct sockaddr *addrs,
 582               int addrcnt,
 583               u_int32_t ppid,
 584               u_int32_t flags,
 585               u_int16_t stream_no,
 586               u_int32_t timetolive,
 587               u_int32_t context)
 588 {
 589         struct sctp_sndrcvinfo sinfo;
 590
 591         memset((void *) &sinfo, 0, sizeof(struct sctp_sndrcvinfo));
 592         sinfo.sinfo_ppid       = ppid;
 593         sinfo.sinfo_flags      = flags;
 594         sinfo.sinfo_ssn        = stream_no;
 595         sinfo.sinfo_timetolive = timetolive;
 596         sinfo.sinfo_context    = context;
 597         return sctp_sendx(sd, msg, len, addrs, addrcnt, &sinfo, 0);
 598 }
 599
 600 ssize_t
 601 sctp_recvmsg (int s,
 602               void *dbuf,
 603               size_t len,
 604               struct sockaddr *from,
 605               socklen_t *fromlen,
 606               struct sctp_sndrcvinfo *sinfo,
 607               int *msg_flags)
 608 {
 609         struct sctp_sndrcvinfo *s_info;
 610         ssize_t sz;
 611         struct msghdr msg;
 612         struct iovec iov[2];
 613         char controlVector[2048];
 614         struct cmsghdr *cmsg;
 615         iov[0].iov_base = dbuf;
 616         iov[0].iov_len = len;
 617         iov[1].iov_base = NULL;
 618         iov[1].iov_len = 0;
 619         msg.msg_name = (caddr_t)from;
 620         msg.msg_namelen = *fromlen;
 621         msg.msg_iov = iov;
 622         msg.msg_iovlen = 1;
 623         msg.msg_control = (caddr_t)controlVector;
 624         msg.msg_controllen = sizeof(controlVector);
 625         errno = 0;
 626         sz = recvmsg(s, &msg, 0);
 627
 628         s_info = NULL;
 629         len = sz;
 630         *msg_flags = msg.msg_flags;
 631         *fromlen = msg.msg_namelen;
 632         if ((msg.msg_controllen) && sinfo) {
 633                 /* parse through and see if we find
 634                  * the sctp_sndrcvinfo (if the user wants it).
 635                  */
 636                 cmsg = (struct cmsghdr *)controlVector;
 637                 while (cmsg) {
 638                         if (cmsg->cmsg_level == IPPROTO_SCTP) {
 639                                 if (cmsg->cmsg_type == SCTP_SNDRCV) {
 640                                         /* Got it */
 641                                         s_info = (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg);
 642                                         /* Copy it to the user */
 643                                         *sinfo = *s_info;
 644                                         break;
 645                                 }
 646                         }
 647                         cmsg = CMSG_NXTHDR(&msg, cmsg);
 648                 }
 649         }
 650         return(sz);
 651 }
 652
 653 #ifdef SYS_sctp_peeloff
 654 int
 655 sctp_peeloff(int sd, sctp_assoc_t assoc_id)
 656 {
 657         return (syscall(SYS_sctp_peeloff, sd, assoc_id));
 658 }
 659 #endif