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 1.33 2008/10/28 03:07:28 sephe Exp $
  36  */
  37
  38 #include "opt_inet6.h"
  39 #include "opt_ipsec.h"
  40
  41 #include <sys/param.h>
  42 #include <sys/systm.h>
  43 #include <sys/kernel.h>
  44 #include <sys/jail.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 (ssb_appendaddr(&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         /* Check the minimum TTL for socket. */
 230         if (last && ip->ip_ttl < last->inp_ip_minttl) {
 231                 m_freem(opts);
 232                 ipstat.ips_delivered--;
 233         } else if (last) {
 234                 if (last->inp_flags & INP_CONTROLOPTS ||
 235                     last->inp_socket->so_options & SO_TIMESTAMP)
 236                         ip_savecontrol(last, &opts, ip, m);
 237                 if (ssb_appendaddr(&last->inp_socket->so_rcv,
 238                     (struct sockaddr *)&ripsrc, m, opts) == 0) {
 239                         m_freem(m);
 240                         if (opts)
 241                             m_freem(opts);
 242                 } else
 243                         sorwakeup(last->inp_socket);
 244         } else {
 245                 m_freem(m);
 246                 ipstat.ips_noproto++;
 247                 ipstat.ips_delivered--;
 248         }
 249 }
 250
 251 /*
 252  * Generate IP header and pass packet to ip_output.
 253  * Tack on options user may have setup with control call.
 254  */
 255 int
 256 rip_output(struct mbuf *m, struct socket *so, ...)
 257 {
 258         struct ip *ip;
 259         struct inpcb *inp = so->so_pcb;
 260         __va_list ap;
 261         int flags = (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST;
 262         u_long dst;
 263
 264         __va_start(ap, so);
 265         dst = __va_arg(ap, u_long);
 266         __va_end(ap);
 267
 268         /*
 269          * If the user handed us a complete IP packet, use it.
 270          * Otherwise, allocate an mbuf for a header and fill it in.
 271          */
 272         if ((inp->inp_flags & INP_HDRINCL) == 0) {
 273                 if (m->m_pkthdr.len + sizeof(struct ip) > IP_MAXPACKET) {
 274                         m_freem(m);
 275                         return(EMSGSIZE);
 276                 }
 277                 M_PREPEND(m, sizeof(struct ip), MB_WAIT);
 278                 if (m == NULL)
 279                         return(ENOBUFS);
 280                 ip = mtod(m, struct ip *);
 281                 ip->ip_tos = inp->inp_ip_tos;
 282                 ip->ip_off = 0;
 283                 ip->ip_p = inp->inp_ip_p;
 284                 ip->ip_len = m->m_pkthdr.len;
 285                 ip->ip_src = inp->inp_laddr;
 286                 ip->ip_dst.s_addr = dst;
 287                 ip->ip_ttl = inp->inp_ip_ttl;
 288         } else {
 289                 int hlen;
 290
 291                 if (m->m_pkthdr.len > IP_MAXPACKET) {
 292                         m_freem(m);
 293                         return(EMSGSIZE);
 294                 }
 295                 if (m->m_len < sizeof(struct ip)) {
 296                         m = m_pullup(m, sizeof(struct ip));
 297                         if (m == NULL)
 298                                 return ENOBUFS;
 299                 }
 300                 ip = mtod(m, struct ip *);
 301                 hlen = IP_VHL_HL(ip->ip_vhl) << 2;
 302
 303                 /* Don't allow header length less than the minimum. */
 304                 if (hlen < sizeof(struct ip)) {
 305                         m_freem(m);
 306                         return EINVAL;
 307                 }
 308
 309                 /*
 310                  * Don't allow both user specified and setsockopt options.
 311                  * Don't allow packet length sizes that will crash.
 312                  */
 313                 if ((hlen != sizeof(struct ip) && inp->inp_options) ||
 314                     ip->ip_len > m->m_pkthdr.len || ip->ip_len < hlen) {
 315                         m_freem(m);
 316                         return EINVAL;
 317                 }
 318                 if (ip->ip_id == 0)
 319                         ip->ip_id = ip_newid();
 320
 321                 /* Prevent ip_output from overwriting header fields */
 322                 flags |= IP_RAWOUTPUT;
 323                 ipstat.ips_rawout++;
 324         }
 325
 326         return ip_output(m, inp->inp_options, &inp->inp_route, flags,
 327                          inp->inp_moptions, inp);
 328 }
 329
 330 /*
 331  * Raw IP socket option processing.
 332  */
 333 int
 334 rip_ctloutput(struct socket *so, struct sockopt *sopt)
 335 {
 336         struct  inpcb *inp = so->so_pcb;
 337         int     error, optval;
 338
 339         if (sopt->sopt_level != IPPROTO_IP)
 340                 return (EINVAL);
 341
 342         error = 0;
 343
 344         switch (sopt->sopt_dir) {
 345         case SOPT_GET:
 346                 switch (sopt->sopt_name) {
 347                 case IP_HDRINCL:
 348                         optval = inp->inp_flags & INP_HDRINCL;
 349                         soopt_from_kbuf(sopt, &optval, sizeof optval);
 350                         break;
 351
 352                 case IP_FW_ADD: /* ADD actually returns the body... */
 353                 case IP_FW_GET:
 354                         if (IPFW_LOADED)
 355                                 error = ip_fw_sockopt(sopt);
 356                         else
 357                                 error = ENOPROTOOPT;
 358                         break;
 359
 360                 case IP_DUMMYNET_GET:
 361                         error = ip_dn_sockopt(sopt);
 362                         break ;
 363
 364                 case MRT_INIT:
 365                 case MRT_DONE:
 366                 case MRT_ADD_VIF:
 367                 case MRT_DEL_VIF:
 368                 case MRT_ADD_MFC:
 369                 case MRT_DEL_MFC:
 370                 case MRT_VERSION:
 371                 case MRT_ASSERT:
 372                 case MRT_API_SUPPORT:
 373                 case MRT_API_CONFIG:
 374                 case MRT_ADD_BW_UPCALL:
 375                 case MRT_DEL_BW_UPCALL:
 376                         error = ip_mrouter_get ? ip_mrouter_get(so, sopt) :
 377                                 EOPNOTSUPP;
 378                         break;
 379
 380                 default:
 381                         error = ip_ctloutput(so, sopt);
 382                         break;
 383                 }
 384                 break;
 385
 386         case SOPT_SET:
 387                 switch (sopt->sopt_name) {
 388                 case IP_HDRINCL:
 389                         error = soopt_to_kbuf(sopt, &optval, sizeof optval,
 390                                               sizeof optval);
 391                         if (error)
 392                                 break;
 393                         if (optval)
 394                                 inp->inp_flags |= INP_HDRINCL;
 395                         else
 396                                 inp->inp_flags &= ~INP_HDRINCL;
 397                         break;
 398
 399                 case IP_FW_ADD:
 400                 case IP_FW_DEL:
 401                 case IP_FW_FLUSH:
 402                 case IP_FW_ZERO:
 403                 case IP_FW_RESETLOG:
 404                         if (IPFW_LOADED)
 405                                 error = ip_fw_ctl_ptr(sopt);
 406                         else
 407                                 error = ENOPROTOOPT;
 408                         break;
 409
 410                 case IP_DUMMYNET_CONFIGURE:
 411                 case IP_DUMMYNET_DEL:
 412                 case IP_DUMMYNET_FLUSH:
 413                         error = ip_dn_sockopt(sopt);
 414                         break ;
 415
 416                 case IP_RSVP_ON:
 417                         error = ip_rsvp_init(so);
 418                         break;
 419
 420                 case IP_RSVP_OFF:
 421                         error = ip_rsvp_done();
 422                         break;
 423
 424                 case IP_RSVP_VIF_ON:
 425                 case IP_RSVP_VIF_OFF:
 426                         error = ip_rsvp_vif ?
 427                                 ip_rsvp_vif(so, sopt) : EINVAL;
 428                         break;
 429
 430                 case MRT_INIT:
 431                 case MRT_DONE:
 432                 case MRT_ADD_VIF:
 433                 case MRT_DEL_VIF:
 434                 case MRT_ADD_MFC:
 435                 case MRT_DEL_MFC:
 436                 case MRT_VERSION:
 437                 case MRT_ASSERT:
 438                 case MRT_API_SUPPORT:
 439                 case MRT_API_CONFIG:
 440                 case MRT_ADD_BW_UPCALL:
 441                 case MRT_DEL_BW_UPCALL:
 442                         error = ip_mrouter_set ? ip_mrouter_set(so, sopt) :
 443                                         EOPNOTSUPP;
 444                         break;
 445
 446                 default:
 447                         error = ip_ctloutput(so, sopt);
 448                         break;
 449                 }
 450                 break;
 451         }
 452
 453         return (error);
 454 }
 455
 456 /*
 457  * This function exists solely to receive the PRC_IFDOWN messages which
 458  * are sent by if_down().  It looks for an ifaddr whose ifa_addr is sa,
 459  * and calls in_ifadown() to remove all routes corresponding to that address.
 460  * It also receives the PRC_IFUP messages from if_up() and reinstalls the
 461  * interface routes.
 462  */
 463 void
 464 rip_ctlinput(int cmd, struct sockaddr *sa, void *vip)
 465 {
 466         struct in_ifaddr *ia;
 467         struct in_ifaddr_container *iac;
 468         struct ifnet *ifp;
 469         int err;
 470         int flags;
 471
 472         switch (cmd) {
 473         case PRC_IFDOWN:
 474                 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
 475                         ia = iac->ia;
 476
 477                         if (ia->ia_ifa.ifa_addr == sa &&
 478                             (ia->ia_flags & IFA_ROUTE)) {
 479                                 /*
 480                                  * in_ifscrub kills the interface route.
 481                                  */
 482                                 in_ifscrub(ia->ia_ifp, ia);
 483                                 /*
 484                                  * in_ifadown gets rid of all the rest of
 485                                  * the routes.  This is not quite the right
 486                                  * thing to do, but at least if we are running
 487                                  * a routing process they will come back.
 488                                  */
 489                                 in_ifadown(&ia->ia_ifa, 0);
 490                                 break;
 491                         }
 492                 }
 493                 break;
 494
 495         case PRC_IFUP:
 496                 ia = NULL;
 497                 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
 498                         if (iac->ia->ia_ifa.ifa_addr == sa) {
 499                                 ia = iac->ia;
 500                                 break;
 501                         }
 502                 }
 503                 if (ia == NULL || (ia->ia_flags & IFA_ROUTE))
 504                         return;
 505                 flags = RTF_UP;
 506                 ifp = ia->ia_ifa.ifa_ifp;
 507
 508                 if ((ifp->if_flags & IFF_LOOPBACK) ||
 509                     (ifp->if_flags & IFF_POINTOPOINT))
 510                         flags |= RTF_HOST;
 511
 512                 err = rtinit(&ia->ia_ifa, RTM_ADD, flags);
 513                 if (err == 0)
 514                         ia->ia_flags |= IFA_ROUTE;
 515                 break;
 516         }
 517 }
 518
 519 u_long  rip_sendspace = RIPSNDQ;
 520 u_long  rip_recvspace = RIPRCVQ;
 521
 522 SYSCTL_INT(_net_inet_raw, OID_AUTO, maxdgram, CTLFLAG_RW,
 523     &rip_sendspace, 0, "Maximum outgoing raw IP datagram size");
 524 SYSCTL_INT(_net_inet_raw, OID_AUTO, recvspace, CTLFLAG_RW,
 525     &rip_recvspace, 0, "Maximum incoming raw IP datagram size");
 526
 527 static int
 528 rip_attach(struct socket *so, int proto, struct pru_attach_info *ai)
 529 {
 530         struct inpcb *inp;
 531         int error;
 532         int flag;
 533
 534         if (jailed(ai->p_ucred) && jail_allow_raw_sockets)
 535                 flag = NULL_CRED_OKAY | PRISON_ROOT;
 536         else
 537                 flag = NULL_CRED_OKAY;
 538
 539         inp = so->so_pcb;
 540         if (inp)
 541                 panic("rip_attach");
 542         if ((error = suser_cred(ai->p_ucred, flag)) != 0)
 543                 return error;
 544
 545         error = soreserve(so, rip_sendspace, rip_recvspace, ai->sb_rlimit);
 546         if (error)
 547                 return error;
 548         crit_enter();
 549         error = in_pcballoc(so, &ripcbinfo);
 550         crit_exit();
 551         if (error)
 552                 return error;
 553         inp = (struct inpcb *)so->so_pcb;
 554         inp->inp_vflag |= INP_IPV4;
 555         inp->inp_ip_p = proto;
 556         inp->inp_ip_ttl = ip_defttl;
 557         return 0;
 558 }
 559
 560 static int
 561 rip_detach(struct socket *so)
 562 {
 563         struct inpcb *inp;
 564
 565         inp = so->so_pcb;
 566         if (inp == 0)
 567                 panic("rip_detach");
 568         if (so == ip_mrouter && ip_mrouter_done)
 569                 ip_mrouter_done();
 570         if (ip_rsvp_force_done)
 571                 ip_rsvp_force_done(so);
 572         if (so == ip_rsvpd)
 573                 ip_rsvp_done();
 574         in_pcbdetach(inp);
 575         return 0;
 576 }
 577
 578 static int
 579 rip_abort(struct socket *so)
 580 {
 581         soisdisconnected(so);
 582         if (so->so_state & SS_NOFDREF)
 583                 return rip_detach(so);
 584         return 0;
 585 }
 586
 587 static int
 588 rip_disconnect(struct socket *so)
 589 {
 590         if ((so->so_state & SS_ISCONNECTED) == 0)
 591                 return ENOTCONN;
 592         return rip_abort(so);
 593 }
 594
 595 static int
 596 rip_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 597 {
 598         struct inpcb *inp = so->so_pcb;
 599         struct sockaddr_in *addr = (struct sockaddr_in *)nam;
 600
 601         if (nam->sa_len != sizeof(*addr))
 602                 return EINVAL;
 603
 604         if (TAILQ_EMPTY(&ifnet) || ((addr->sin_family != AF_INET) &&
 605                                     (addr->sin_family != AF_IMPLINK)) ||
 606             (addr->sin_addr.s_addr != INADDR_ANY &&
 607              ifa_ifwithaddr((struct sockaddr *)addr) == 0))
 608                 return EADDRNOTAVAIL;
 609         inp->inp_laddr = addr->sin_addr;
 610         return 0;
 611 }
 612
 613 static int
 614 rip_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 615 {
 616         struct inpcb *inp = so->so_pcb;
 617         struct sockaddr_in *addr = (struct sockaddr_in *)nam;
 618
 619         if (nam->sa_len != sizeof(*addr))
 620                 return EINVAL;
 621         if (TAILQ_EMPTY(&ifnet))
 622                 return EADDRNOTAVAIL;
 623         if ((addr->sin_family != AF_INET) &&
 624             (addr->sin_family != AF_IMPLINK))
 625                 return EAFNOSUPPORT;
 626         inp->inp_faddr = addr->sin_addr;
 627         soisconnected(so);
 628         return 0;
 629 }
 630
 631 static int
 632 rip_shutdown(struct socket *so)
 633 {
 634         socantsendmore(so);
 635         return 0;
 636 }
 637
 638 static int
 639 rip_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
 640          struct mbuf *control, struct thread *td)
 641 {
 642         struct inpcb *inp = so->so_pcb;
 643         u_long dst;
 644
 645         if (so->so_state & SS_ISCONNECTED) {
 646                 if (nam) {
 647                         m_freem(m);
 648                         return EISCONN;
 649                 }
 650                 dst = inp->inp_faddr.s_addr;
 651         } else {
 652                 if (nam == NULL) {
 653                         m_freem(m);
 654                         return ENOTCONN;
 655                 }
 656                 dst = ((struct sockaddr_in *)nam)->sin_addr.s_addr;
 657         }
 658         return rip_output(m, so, dst);
 659 }
 660
 661 SYSCTL_PROC(_net_inet_raw, OID_AUTO/*XXX*/, pcblist, CTLFLAG_RD, &ripcbinfo, 0,
 662             in_pcblist_global, "S,xinpcb", "List of active raw IP sockets");
 663
 664 struct pr_usrreqs rip_usrreqs = {
 665         .pru_abort = rip_abort,
 666         .pru_accept = pru_accept_notsupp,
 667         .pru_attach = rip_attach,
 668         .pru_bind = rip_bind,
 669         .pru_connect = rip_connect,
 670         .pru_connect2 = pru_connect2_notsupp,
 671         .pru_control = in_control,
 672         .pru_detach = rip_detach,
 673         .pru_disconnect = rip_disconnect,
 674         .pru_listen = pru_listen_notsupp,
 675         .pru_peeraddr = in_setpeeraddr,
 676         .pru_rcvd = pru_rcvd_notsupp,
 677         .pru_rcvoob = pru_rcvoob_notsupp,
 678         .pru_send = rip_send,
 679         .pru_sense = pru_sense_null,
 680         .pru_shutdown = rip_shutdown,
 681         .pru_sockaddr = in_setsockaddr,
 682         .pru_sosend = sosend,
 683         .pru_soreceive = soreceive,
 684         .pru_sopoll = sopoll
 685 };