sys/netinet/raw_ip.c

   1 /*
   2  * Copyright (c) 1982, 1986, 1988, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  *      @(#)raw_ip.c    8.7 (Berkeley) 5/15/95
  34  * $FreeBSD: src/sys/netinet/raw_ip.c,v 1.64.2.16 2003/08/24 08:24:38 hsu Exp $
  35  * $DragonFly: src/sys/netinet/raw_ip.c,v 1.22 2005/06/02 23:52:42 dillon Exp $
  36  */
  37
  38 #include "opt_inet6.h"
  39 #include "opt_ipsec.h"
  40 #include "opt_random_ip_id.h"
  41
  42 #include <sys/param.h>
  43 #include <sys/systm.h>
  44 #include <sys/kernel.h>
  45 #include <sys/malloc.h>
  46 #include <sys/mbuf.h>
  47 #include <sys/proc.h>
  48 #include <sys/protosw.h>
  49 #include <sys/socket.h>
  50 #include <sys/socketvar.h>
  51 #include <sys/sysctl.h>
  52 #include <sys/thread2.h>
  53
  54 #include <machine/stdarg.h>
  55
  56 #include <vm/vm_zone.h>
  57
  58 #include <net/if.h>
  59 #include <net/route.h>
  60
  61 #define _IP_VHL
  62 #include <netinet/in.h>
  63 #include <netinet/in_systm.h>
  64 #include <netinet/ip.h>
  65 #include <netinet/in_pcb.h>
  66 #include <netinet/in_var.h>
  67 #include <netinet/ip_var.h>
  68
  69 #include <net/ip_mroute/ip_mroute.h>
  70 #include <net/ipfw/ip_fw.h>
  71 #include <net/dummynet/ip_dummynet.h>
  72
  73 #ifdef FAST_IPSEC
  74 #include <netproto/ipsec/ipsec.h>
  75 #endif /*FAST_IPSEC*/
  76
  77 #ifdef IPSEC
  78 #include <netinet6/ipsec.h>
  79 #endif /*IPSEC*/
  80
  81 struct  inpcbinfo ripcbinfo;
  82
  83 /* control hooks for ipfw and dummynet */
  84 ip_fw_ctl_t *ip_fw_ctl_ptr;
  85 ip_dn_ctl_t *ip_dn_ctl_ptr;
  86
  87 /*
  88  * hooks for multicast routing. They all default to NULL,
  89  * so leave them not initialized and rely on BSS being set to 0.
  90  */
  91
  92 /* The socket used to communicate with the multicast routing daemon.  */
  93 struct socket  *ip_mrouter;
  94
  95 /* The various mrouter and rsvp functions */
  96 int (*ip_mrouter_set)(struct socket *, struct sockopt *);
  97 int (*ip_mrouter_get)(struct socket *, struct sockopt *);
  98 int (*ip_mrouter_done)(void);
  99 int (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *,
 100                 struct ip_moptions *);
 101 int (*mrt_ioctl)(int, caddr_t);
 102 int (*legal_vif_num)(int);
 103 u_long (*ip_mcast_src)(int);
 104
 105 void (*rsvp_input_p)(struct mbuf *m, ...);
 106 int (*ip_rsvp_vif)(struct socket *, struct sockopt *);
 107 void (*ip_rsvp_force_done)(struct socket *);
 108
 109 /*
 110  * Nominal space allocated to a raw ip socket.
 111  */
 112 #define RIPSNDQ         8192
 113 #define RIPRCVQ         8192
 114
 115 /*
 116  * Raw interface to IP protocol.
 117  */
 118
 119 /*
 120  * Initialize raw connection block queue.
 121  */
 122 void
 123 rip_init(void)
 124 {
 125         in_pcbinfo_init(&ripcbinfo);
 126         /*
 127          * XXX We don't use the hash list for raw IP, but it's easier
 128          * to allocate a one entry hash list than it is to check all
 129          * over the place for hashbase == NULL.
 130          */
 131         ripcbinfo.hashbase = hashinit(1, M_PCB, &ripcbinfo.hashmask);
 132         ripcbinfo.porthashbase = hashinit(1, M_PCB, &ripcbinfo.porthashmask);
 133         ripcbinfo.wildcardhashbase = hashinit(1, M_PCB,
 134                                               &ripcbinfo.wildcardhashmask);
 135         ripcbinfo.ipi_zone = zinit("ripcb", sizeof(struct inpcb),
 136                                    maxsockets, ZONE_INTERRUPT, 0);
 137 }
 138
 139 /*
 140  * Setup generic address and protocol structures
 141  * for raw_input routine, then pass them along with
 142  * mbuf chain.
 143  */
 144 void
 145 rip_input(struct mbuf *m, ...)
 146 {
 147         struct sockaddr_in ripsrc = { sizeof ripsrc, AF_INET };
 148         struct ip *ip = mtod(m, struct ip *);
 149         struct inpcb *inp;
 150         struct inpcb *last = NULL;
 151         struct mbuf *opts = NULL;
 152         int off, proto;
 153         __va_list ap;
 154
 155         __va_start(ap, m);
 156         off = __va_arg(ap, int);
 157         proto = __va_arg(ap, int);
 158         __va_end(ap);
 159
 160         ripsrc.sin_addr = ip->ip_src;
 161         LIST_FOREACH(inp, &ripcbinfo.pcblisthead, inp_list) {
 162                 if (inp->inp_flags & INP_PLACEMARKER)
 163                         continue;
 164 #ifdef INET6
 165                 if ((inp->inp_vflag & INP_IPV4) == 0)
 166                         continue;
 167 #endif
 168                 if (inp->inp_ip_p && inp->inp_ip_p != proto)
 169                         continue;
 170                 if (inp->inp_laddr.s_addr != INADDR_ANY &&
 171                     inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
 172                         continue;
 173                 if (inp->inp_faddr.s_addr != INADDR_ANY &&
 174                     inp->inp_faddr.s_addr != ip->ip_src.s_addr)
 175                         continue;
 176                 if (last) {
 177                         struct mbuf *n = m_copypacket(m, MB_DONTWAIT);
 178
 179 #ifdef IPSEC
 180                         /* check AH/ESP integrity. */
 181                         if (n && ipsec4_in_reject_so(n, last->inp_socket)) {
 182                                 m_freem(n);
 183                                 ipsecstat.in_polvio++;
 184                                 /* do not inject data to pcb */
 185                         } else
 186 #endif /*IPSEC*/
 187 #ifdef FAST_IPSEC
 188                         /* check AH/ESP integrity. */
 189                         if (ipsec4_in_reject(n, last)) {
 190                                 m_freem(n);
 191                                 /* do not inject data to pcb */
 192                         } else
 193 #endif /*FAST_IPSEC*/
 194                         if (n) {
 195                                 if (last->inp_flags & INP_CONTROLOPTS ||
 196                                     last->inp_socket->so_options & SO_TIMESTAMP)
 197                                     ip_savecontrol(last, &opts, ip, n);
 198                                 if (sbappendaddr(&last->inp_socket->so_rcv,
 199                                     (struct sockaddr *)&ripsrc, n,
 200                                     opts) == 0) {
 201                                         /* should notify about lost packet */
 202                                         m_freem(n);
 203                                         if (opts)
 204                                             m_freem(opts);
 205                                 } else
 206                                         sorwakeup(last->inp_socket);
 207                                 opts = 0;
 208                         }
 209                 }
 210                 last = inp;
 211         }
 212 #ifdef IPSEC
 213         /* check AH/ESP integrity. */
 214         if (last && ipsec4_in_reject_so(m, last->inp_socket)) {
 215                 m_freem(m);
 216                 ipsecstat.in_polvio++;
 217                 ipstat.ips_delivered--;
 218                 /* do not inject data to pcb */
 219         } else
 220 #endif /*IPSEC*/
 221 #ifdef FAST_IPSEC
 222         /* check AH/ESP integrity. */
 223         if (last && ipsec4_in_reject(m, last)) {
 224                 m_freem(m);
 225                 ipstat.ips_delivered--;
 226                 /* do not inject data to pcb */
 227         } else
 228 #endif /*FAST_IPSEC*/
 229         if (last) {
 230                 if (last->inp_flags & INP_CONTROLOPTS ||
 231                     last->inp_socket->so_options & SO_TIMESTAMP)
 232                         ip_savecontrol(last, &opts, ip, m);
 233                 if (sbappendaddr(&last->inp_socket->so_rcv,
 234                     (struct sockaddr *)&ripsrc, m, opts) == 0) {
 235                         m_freem(m);
 236                         if (opts)
 237                             m_freem(opts);
 238                 } else
 239                         sorwakeup(last->inp_socket);
 240         } else {
 241                 m_freem(m);
 242                 ipstat.ips_noproto++;
 243                 ipstat.ips_delivered--;
 244         }
 245 }
 246
 247 /*
 248  * Generate IP header and pass packet to ip_output.
 249  * Tack on options user may have setup with control call.
 250  */
 251 int
 252 rip_output(struct mbuf *m, struct socket *so, ...)
 253 {
 254         struct ip *ip;
 255         struct inpcb *inp = so->so_pcb;
 256         __va_list ap;
 257         int flags = (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST;
 258         u_long dst;
 259
 260         __va_start(ap, so);
 261         dst = __va_arg(ap, u_long);
 262         __va_end(ap);
 263
 264         /*
 265          * If the user handed us a complete IP packet, use it.
 266          * Otherwise, allocate an mbuf for a header and fill it in.
 267          */
 268         if ((inp->inp_flags & INP_HDRINCL) == 0) {
 269                 if (m->m_pkthdr.len + sizeof(struct ip) > IP_MAXPACKET) {
 270                         m_freem(m);
 271                         return(EMSGSIZE);
 272                 }
 273                 M_PREPEND(m, sizeof(struct ip), MB_WAIT);
 274                 if (m == NULL)
 275                         return(ENOBUFS);
 276                 ip = mtod(m, struct ip *);
 277                 ip->ip_tos = inp->inp_ip_tos;
 278                 ip->ip_off = 0;
 279                 ip->ip_p = inp->inp_ip_p;
 280                 ip->ip_len = m->m_pkthdr.len;
 281                 ip->ip_src = inp->inp_laddr;
 282                 ip->ip_dst.s_addr = dst;
 283                 ip->ip_ttl = inp->inp_ip_ttl;
 284         } else {
 285                 if (m->m_pkthdr.len > IP_MAXPACKET) {
 286                         m_freem(m);
 287                         return(EMSGSIZE);
 288                 }
 289                 ip = mtod(m, struct ip *);
 290                 /* don't allow both user specified and setsockopt options,
 291                    and don't allow packet length sizes that will crash */
 292                 if (((IP_VHL_HL(ip->ip_vhl) != (sizeof (*ip) >> 2)) &&
 293                      inp->inp_options) ||
 294                     (ip->ip_len > m->m_pkthdr.len) ||
 295                     (ip->ip_len < (IP_VHL_HL(ip->ip_vhl) << 2))) {
 296                         m_freem(m);
 297                         return EINVAL;
 298                 }
 299                 if (ip->ip_id == 0)
 300 #ifdef RANDOM_IP_ID
 301                         ip->ip_id = ip_randomid();
 302 #else
 303                         ip->ip_id = htons(ip_id++);
 304 #endif
 305                 /* XXX prevent ip_output from overwriting header fields */
 306                 flags |= IP_RAWOUTPUT;
 307                 ipstat.ips_rawout++;
 308         }
 309
 310         return (ip_output(m, inp->inp_options, &inp->inp_route, flags,
 311                           inp->inp_moptions, inp));
 312 }
 313
 314 /*
 315  * Raw IP socket option processing.
 316  */
 317 int
 318 rip_ctloutput(struct socket *so, struct sockopt *sopt)
 319 {
 320         struct  inpcb *inp = so->so_pcb;
 321         int     error, optval;
 322
 323         if (sopt->sopt_level != IPPROTO_IP)
 324                 return (EINVAL);
 325
 326         error = 0;
 327
 328         switch (sopt->sopt_dir) {
 329         case SOPT_GET:
 330                 switch (sopt->sopt_name) {
 331                 case IP_HDRINCL:
 332                         optval = inp->inp_flags & INP_HDRINCL;
 333                         error = sooptcopyout(sopt, &optval, sizeof optval);
 334                         break;
 335
 336                 case IP_FW_ADD: /* ADD actually returns the body... */
 337                 case IP_FW_GET:
 338                         if (IPFW_LOADED)
 339                                 error = ip_fw_ctl_ptr(sopt);
 340                         else
 341                                 error = ENOPROTOOPT;
 342                         break;
 343
 344                 case IP_DUMMYNET_GET:
 345                         if (DUMMYNET_LOADED)
 346                                 error = ip_dn_ctl_ptr(sopt);
 347                         else
 348                                 error = ENOPROTOOPT;
 349                         break ;
 350
 351                 case MRT_INIT:
 352                 case MRT_DONE:
 353                 case MRT_ADD_VIF:
 354                 case MRT_DEL_VIF:
 355                 case MRT_ADD_MFC:
 356                 case MRT_DEL_MFC:
 357                 case MRT_VERSION:
 358                 case MRT_ASSERT:
 359                 case MRT_API_SUPPORT:
 360                 case MRT_API_CONFIG:
 361                 case MRT_ADD_BW_UPCALL:
 362                 case MRT_DEL_BW_UPCALL:
 363                         error = ip_mrouter_get ? ip_mrouter_get(so, sopt) :
 364                                 EOPNOTSUPP;
 365                         break;
 366
 367                 default:
 368                         error = ip_ctloutput(so, sopt);
 369                         break;
 370                 }
 371                 break;
 372
 373         case SOPT_SET:
 374                 switch (sopt->sopt_name) {
 375                 case IP_HDRINCL:
 376                         error = sooptcopyin(sopt, &optval, sizeof optval,
 377                                             sizeof optval);
 378                         if (error)
 379                                 break;
 380                         if (optval)
 381                                 inp->inp_flags |= INP_HDRINCL;
 382                         else
 383                                 inp->inp_flags &= ~INP_HDRINCL;
 384                         break;
 385
 386                 case IP_FW_ADD:
 387                 case IP_FW_DEL:
 388                 case IP_FW_FLUSH:
 389                 case IP_FW_ZERO:
 390                 case IP_FW_RESETLOG:
 391                         if (IPFW_LOADED)
 392                                 error = ip_fw_ctl_ptr(sopt);
 393                         else
 394                                 error = ENOPROTOOPT;
 395                         break;
 396
 397                 case IP_DUMMYNET_CONFIGURE:
 398                 case IP_DUMMYNET_DEL:
 399                 case IP_DUMMYNET_FLUSH:
 400                         if (DUMMYNET_LOADED)
 401                                 error = ip_dn_ctl_ptr(sopt);
 402                         else
 403                                 error = ENOPROTOOPT ;
 404                         break ;
 405
 406                 case IP_RSVP_ON:
 407                         error = ip_rsvp_init(so);
 408                         break;
 409
 410                 case IP_RSVP_OFF:
 411                         error = ip_rsvp_done();
 412                         break;
 413
 414                 case IP_RSVP_VIF_ON:
 415                 case IP_RSVP_VIF_OFF:
 416                         error = ip_rsvp_vif ?
 417                                 ip_rsvp_vif(so, sopt) : EINVAL;
 418                         break;
 419
 420                 case MRT_INIT:
 421                 case MRT_DONE:
 422                 case MRT_ADD_VIF:
 423                 case MRT_DEL_VIF:
 424                 case MRT_ADD_MFC:
 425                 case MRT_DEL_MFC:
 426                 case MRT_VERSION:
 427                 case MRT_ASSERT:
 428                 case MRT_API_SUPPORT:
 429                 case MRT_API_CONFIG:
 430                 case MRT_ADD_BW_UPCALL:
 431                 case MRT_DEL_BW_UPCALL:
 432                         error = ip_mrouter_set ? ip_mrouter_set(so, sopt) :
 433                                         EOPNOTSUPP;
 434                         break;
 435
 436                 default:
 437                         error = ip_ctloutput(so, sopt);
 438                         break;
 439                 }
 440                 break;
 441         }
 442
 443         return (error);
 444 }
 445
 446 /*
 447  * This function exists solely to receive the PRC_IFDOWN messages which
 448  * are sent by if_down().  It looks for an ifaddr whose ifa_addr is sa,
 449  * and calls in_ifadown() to remove all routes corresponding to that address.
 450  * It also receives the PRC_IFUP messages from if_up() and reinstalls the
 451  * interface routes.
 452  */
 453 void
 454 rip_ctlinput(int cmd, struct sockaddr *sa, void *vip)
 455 {
 456         struct in_ifaddr *ia;
 457         struct ifnet *ifp;
 458         int err;
 459         int flags;
 460
 461         switch (cmd) {
 462         case PRC_IFDOWN:
 463                 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) {
 464                         if (ia->ia_ifa.ifa_addr == sa &&
 465                             (ia->ia_flags & IFA_ROUTE)) {
 466                                 /*
 467                                  * in_ifscrub kills the interface route.
 468                                  */
 469                                 in_ifscrub(ia->ia_ifp, ia);
 470                                 /*
 471                                  * in_ifadown gets rid of all the rest of
 472                                  * the routes.  This is not quite the right
 473                                  * thing to do, but at least if we are running
 474                                  * a routing process they will come back.
 475                                  */
 476                                 in_ifadown(&ia->ia_ifa, 0);
 477                                 break;
 478                         }
 479                 }
 480                 break;
 481
 482         case PRC_IFUP:
 483                 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) {
 484                         if (ia->ia_ifa.ifa_addr == sa)
 485                                 break;
 486                 }
 487                 if (ia == 0 || (ia->ia_flags & IFA_ROUTE))
 488                         return;
 489                 flags = RTF_UP;
 490                 ifp = ia->ia_ifa.ifa_ifp;
 491
 492                 if ((ifp->if_flags & IFF_LOOPBACK) ||
 493                     (ifp->if_flags & IFF_POINTOPOINT))
 494                         flags |= RTF_HOST;
 495
 496                 err = rtinit(&ia->ia_ifa, RTM_ADD, flags);
 497                 if (err == 0)
 498                         ia->ia_flags |= IFA_ROUTE;
 499                 break;
 500         }
 501 }
 502
 503 u_long  rip_sendspace = RIPSNDQ;
 504 u_long  rip_recvspace = RIPRCVQ;
 505
 506 SYSCTL_INT(_net_inet_raw, OID_AUTO, maxdgram, CTLFLAG_RW,
 507     &rip_sendspace, 0, "Maximum outgoing raw IP datagram size");
 508 SYSCTL_INT(_net_inet_raw, OID_AUTO, recvspace, CTLFLAG_RW,
 509     &rip_recvspace, 0, "Maximum incoming raw IP datagram size");
 510
 511 static int
 512 rip_attach(struct socket *so, int proto, struct pru_attach_info *ai)
 513 {
 514         struct inpcb *inp;
 515         int error;
 516
 517         inp = so->so_pcb;
 518         if (inp)
 519                 panic("rip_attach");
 520         if ((error = suser_cred(ai->p_ucred, NULL_CRED_OKAY)) != 0)
 521                 return error;
 522
 523         error = soreserve(so, rip_sendspace, rip_recvspace, ai->sb_rlimit);
 524         if (error)
 525                 return error;
 526         crit_enter();
 527         error = in_pcballoc(so, &ripcbinfo);
 528         crit_exit();
 529         if (error)
 530                 return error;
 531         inp = (struct inpcb *)so->so_pcb;
 532         inp->inp_vflag |= INP_IPV4;
 533         inp->inp_ip_p = proto;
 534         inp->inp_ip_ttl = ip_defttl;
 535         return 0;
 536 }
 537
 538 static int
 539 rip_detach(struct socket *so)
 540 {
 541         struct inpcb *inp;
 542
 543         inp = so->so_pcb;
 544         if (inp == 0)
 545                 panic("rip_detach");
 546         if (so == ip_mrouter && ip_mrouter_done)
 547                 ip_mrouter_done();
 548         if (ip_rsvp_force_done)
 549                 ip_rsvp_force_done(so);
 550         if (so == ip_rsvpd)
 551                 ip_rsvp_done();
 552         in_pcbdetach(inp);
 553         return 0;
 554 }
 555
 556 static int
 557 rip_abort(struct socket *so)
 558 {
 559         soisdisconnected(so);
 560         if (so->so_state & SS_NOFDREF)
 561                 return rip_detach(so);
 562         return 0;
 563 }
 564
 565 static int
 566 rip_disconnect(struct socket *so)
 567 {
 568         if ((so->so_state & SS_ISCONNECTED) == 0)
 569                 return ENOTCONN;
 570         return rip_abort(so);
 571 }
 572
 573 static int
 574 rip_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 575 {
 576         struct inpcb *inp = so->so_pcb;
 577         struct sockaddr_in *addr = (struct sockaddr_in *)nam;
 578
 579         if (nam->sa_len != sizeof(*addr))
 580                 return EINVAL;
 581
 582         if (TAILQ_EMPTY(&ifnet) || ((addr->sin_family != AF_INET) &&
 583                                     (addr->sin_family != AF_IMPLINK)) ||
 584             (addr->sin_addr.s_addr != INADDR_ANY &&
 585              ifa_ifwithaddr((struct sockaddr *)addr) == 0))
 586                 return EADDRNOTAVAIL;
 587         inp->inp_laddr = addr->sin_addr;
 588         return 0;
 589 }
 590
 591 static int
 592 rip_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 593 {
 594         struct inpcb *inp = so->so_pcb;
 595         struct sockaddr_in *addr = (struct sockaddr_in *)nam;
 596
 597         if (nam->sa_len != sizeof(*addr))
 598                 return EINVAL;
 599         if (TAILQ_EMPTY(&ifnet))
 600                 return EADDRNOTAVAIL;
 601         if ((addr->sin_family != AF_INET) &&
 602             (addr->sin_family != AF_IMPLINK))
 603                 return EAFNOSUPPORT;
 604         inp->inp_faddr = addr->sin_addr;
 605         soisconnected(so);
 606         return 0;
 607 }
 608
 609 static int
 610 rip_shutdown(struct socket *so)
 611 {
 612         socantsendmore(so);
 613         return 0;
 614 }
 615
 616 static int
 617 rip_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
 618          struct mbuf *control, struct thread *td)
 619 {
 620         struct inpcb *inp = so->so_pcb;
 621         u_long dst;
 622
 623         if (so->so_state & SS_ISCONNECTED) {
 624                 if (nam) {
 625                         m_freem(m);
 626                         return EISCONN;
 627                 }
 628                 dst = inp->inp_faddr.s_addr;
 629         } else {
 630                 if (nam == NULL) {
 631                         m_freem(m);
 632                         return ENOTCONN;
 633                 }
 634                 dst = ((struct sockaddr_in *)nam)->sin_addr.s_addr;
 635         }
 636         return rip_output(m, so, dst);
 637 }
 638
 639 SYSCTL_PROC(_net_inet_raw, OID_AUTO/*XXX*/, pcblist, CTLFLAG_RD, &ripcbinfo, 0,
 640             in_pcblist_global, "S,xinpcb", "List of active raw IP sockets");
 641
 642 struct pr_usrreqs rip_usrreqs = {
 643         rip_abort, pru_accept_notsupp, rip_attach, rip_bind, rip_connect,
 644         pru_connect2_notsupp, in_control, rip_detach, rip_disconnect,
 645         pru_listen_notsupp, in_setpeeraddr, pru_rcvd_notsupp,
 646         pru_rcvoob_notsupp, rip_send, pru_sense_null, rip_shutdown,
 647         in_setsockaddr, sosend, soreceive, sopoll
 648 };