bsd/netinet/raw_ip.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * Copyright (c) 1982, 1986, 1988, 1993
  24  *      The Regents of the University of California.  All rights reserved.
  25  *
  26  * Redistribution and use in source and binary forms, with or without
  27  * modification, are permitted provided that the following conditions
  28  * are met:
  29  * 1. Redistributions of source code must retain the above copyright
  30  *    notice, this list of conditions and the following disclaimer.
  31  * 2. Redistributions in binary form must reproduce the above copyright
  32  *    notice, this list of conditions and the following disclaimer in the
  33  *    documentation and/or other materials provided with the distribution.
  34  * 3. All advertising materials mentioning features or use of this software
  35  *    must display the following acknowledgement:
  36  *      This product includes software developed by the University of
  37  *      California, Berkeley and its contributors.
  38  * 4. Neither the name of the University nor the names of its contributors
  39  *    may be used to endorse or promote products derived from this software
  40  *    without specific prior written permission.
  41  *
  42  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  43  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  44  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  45  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  46  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  47  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  48  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  49  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  50  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  51  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  52  * SUCH DAMAGE.
  53  *
  54  *      @(#)raw_ip.c    8.7 (Berkeley) 5/15/95
  55  */
  56
  57 #include <sys/param.h>
  58 #include <sys/systm.h>
  59 #include <sys/kernel.h>
  60 #include <sys/malloc.h>
  61 #include <sys/mbuf.h>
  62 #include <sys/proc.h>
  63 #include <sys/protosw.h>
  64 #include <sys/socket.h>
  65 #include <sys/socketvar.h>
  66 #include <sys/sysctl.h>
  67
  68 #if ISFB31
  69 #include <vm/vm_zone.h>
  70 #endif
  71
  72 #include <net/if.h>
  73 #include <net/route.h>
  74
  75 #define _IP_VHL
  76 #include <netinet/in.h>
  77 #include <netinet/in_systm.h>
  78 #include <netinet/ip.h>
  79 #include <netinet/ip6.h>
  80 #include <netinet6/ip6_var.h>
  81 #include <netinet/in_pcb.h>
  82 #include <netinet/in_var.h>
  83 #include <netinet/ip_var.h>
  84 #include <netinet/ip_mroute.h>
  85
  86 #include <netinet/ip_fw.h>
  87
  88 #if IPSEC
  89 #include <netinet6/ipsec.h>
  90 #endif /*IPSEC*/
  91
  92 #if ISFB31
  93 #include "opt_ipdn.h"
  94 #endif
  95
  96 #if DUMMYNET
  97 #include <netinet/ip_dummynet.h>
  98 #endif
  99 #if !defined(COMPAT_IPFW) || COMPAT_IPFW == 1
 100 #undef COMPAT_IPFW
 101 #define COMPAT_IPFW 1
 102 #else
 103 #undef COMPAT_IPFW
 104 #endif
 105
 106 struct inpcbhead ripcb;
 107 struct inpcbinfo ripcbinfo;
 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 q.
 121  */
 122 void
 123 rip_init()
 124 {
 125         LIST_INIT(&ripcb);
 126         ripcbinfo.listhead = &ripcb;
 127         /*
 128          * XXX We don't use the hash list for raw IP, but it's easier
 129          * to allocate a one entry hash list than it is to check all
 130          * over the place for hashbase == NULL.
 131          */
 132         ripcbinfo.hashbase = hashinit(1, M_PCB, &ripcbinfo.hashmask);
 133         ripcbinfo.porthashbase = hashinit(1, M_PCB, &ripcbinfo.porthashmask);
 134
 135         ripcbinfo.ipi_zone = (void *) zinit(sizeof(struct inpcb),
 136                                             (4096 * sizeof(struct inpcb)),
 137                                             4096, "ripzone");
 138
 139 }
 140
 141 static struct   sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET };
 142 /*
 143  * Setup generic address and protocol structures
 144  * for raw_input routine, then pass them along with
 145  * mbuf chain.
 146  */
 147 void
 148 rip_input(m, iphlen)
 149         struct mbuf *m;
 150         int iphlen;
 151 {
 152         register struct ip *ip = mtod(m, struct ip *);
 153         register struct inpcb *inp;
 154         struct inpcb *last = 0;
 155         struct mbuf *opts = 0;
 156         short need_wakeup = 0;
 157
 158         ripsrc.sin_addr = ip->ip_src;
 159         LIST_FOREACH(inp, &ripcb, inp_list) {
 160                 if ((inp->inp_vflag & INP_IPV4) == NULL)
 161                         continue;
 162 #warning do something about this
 163                 if (inp->inp_ip_p && inp->inp_ip_p != ip->ip_p)
 164                         continue;
 165                 if (inp->inp_laddr.s_addr &&
 166                   inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
 167                         continue;
 168                 if (inp->inp_faddr.s_addr &&
 169                   inp->inp_faddr.s_addr != ip->ip_src.s_addr)
 170                         continue;
 171                 if (last) {
 172                         struct mbuf *n = m_copy(m, 0, (int)M_COPYALL);
 173                         if (n) {
 174                                 if (last->inp_flags & INP_CONTROLOPTS ||
 175                                     last->inp_socket->so_options & SO_TIMESTAMP)
 176                                     ip_savecontrol(last, &opts, ip, n);
 177                 if (last->inp_flags & INP_STRIPHDR) {
 178                     n->m_len -= iphlen;
 179                     n->m_pkthdr.len -= iphlen;
 180                     n->m_data += iphlen;
 181                 }
 182                                 if (sbappendaddr(&last->inp_socket->so_rcv,
 183                                     (struct sockaddr *)&ripsrc, n,
 184                                     opts) == 0) {
 185                                         /* should notify about lost packet */
 186                                     kprintf("rip_input can't append to socket\n");
 187                                         m_freem(n);
 188                                         if (opts)
 189                                             m_freem(opts);
 190                                 } else {
 191                                     /* kprintf("rip_input calling sorwakeup\n"); */
 192                                     need_wakeup++;
 193                                 }
 194                                 opts = 0;
 195                         }
 196                 }
 197                 last = inp;
 198         }
 199         if (last) {
 200                 if (last->inp_flags & INP_CONTROLOPTS ||
 201                     last->inp_socket->so_options & SO_TIMESTAMP)
 202                         ip_savecontrol(last, &opts, ip, m);
 203         if (last->inp_flags & INP_STRIPHDR) {
 204             m->m_len -= iphlen;
 205             m->m_pkthdr.len -= iphlen;
 206             m->m_data += iphlen;
 207         }
 208                 if (sbappendaddr(&last->inp_socket->so_rcv,
 209                     (struct sockaddr *)&ripsrc, m, opts) == 0) {
 210                     kprintf("rip_input(2) can't append to socket\n");
 211                         m_freem(m);
 212                         if (opts)
 213                             m_freem(opts);
 214                 } else {
 215                     /* kprintf("rip_input calling sorwakeup\n"); */
 216                     need_wakeup++;
 217                 }
 218         } else {
 219                 m_freem(m);
 220               ipstat.ips_noproto++;
 221               ipstat.ips_delivered--;
 222       }
 223       if (need_wakeup)
 224                     sorwakeup(last->inp_socket);
 225 }
 226
 227 /*
 228  * Generate IP header and pass packet to ip_output.
 229  * Tack on options user may have setup with control call.
 230  */
 231 int
 232 rip_output(m, so, dst)
 233         register struct mbuf *m;
 234         struct socket *so;
 235         u_long dst;
 236 {
 237         register struct ip *ip;
 238         register struct inpcb *inp = sotoinpcb(so);
 239         int flags = (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST;
 240
 241         /*
 242          * If the user handed us a complete IP packet, use it.
 243          * Otherwise, allocate an mbuf for a header and fill it in.
 244          */
 245         if ((inp->inp_flags & INP_HDRINCL) == 0) {
 246                 if (m->m_pkthdr.len + sizeof(struct ip) > IP_MAXPACKET) {
 247                         m_freem(m);
 248                         return(EMSGSIZE);
 249                 }
 250                 M_PREPEND(m, sizeof(struct ip), M_WAIT);
 251                 ip = mtod(m, struct ip *);
 252                 ip->ip_tos = 0;
 253                 ip->ip_off = 0;
 254                 ip->ip_p = inp->inp_ip_p;
 255                 ip->ip_len = m->m_pkthdr.len;
 256                 ip->ip_src = inp->inp_laddr;
 257                 ip->ip_dst.s_addr = dst;
 258                 ip->ip_ttl = MAXTTL;
 259         } else {
 260                 if (m->m_pkthdr.len > IP_MAXPACKET) {
 261                         m_freem(m);
 262                         return(EMSGSIZE);
 263                 }
 264                 ip = mtod(m, struct ip *);
 265                 /* don't allow both user specified and setsockopt options,
 266                    and don't allow packet length sizes that will crash */
 267                 if (((IP_VHL_HL(ip->ip_vhl) != (sizeof (*ip) >> 2))
 268                      && inp->inp_options)
 269                     || (ip->ip_len > m->m_pkthdr.len)
 270                     || (ip->ip_len < (IP_VHL_HL(ip->ip_vhl) << 2))) {
 271                         m_freem(m);
 272                         return EINVAL;
 273                 }
 274                 if (ip->ip_id == 0)
 275                         ip->ip_id = htons(ip_id++);
 276                 /* XXX prevent ip_output from overwriting header fields */
 277                 flags |= IP_RAWOUTPUT;
 278                 ipstat.ips_rawout++;
 279         }
 280
 281 #if IPSEC
 282         m->m_pkthdr.rcvif = (struct ifnet *)so; /*XXX*/
 283 #endif /*IPSEC*/
 284
 285         return (ip_output(m, inp->inp_options, &inp->inp_route, flags,
 286                           inp->inp_moptions));
 287 }
 288
 289 /*
 290  * Raw IP socket option processing.
 291  */
 292 int
 293 rip_ctloutput(so, sopt)
 294         struct socket *so;
 295         struct sockopt *sopt;
 296 {
 297         struct  inpcb *inp = sotoinpcb(so);
 298         int     error, optval;
 299
 300         if (sopt->sopt_level != IPPROTO_IP)
 301                 return (EINVAL);
 302
 303         error = 0;
 304
 305         switch (sopt->sopt_dir) {
 306         case SOPT_GET:
 307                 switch (sopt->sopt_name) {
 308                 case IP_HDRINCL:
 309                         optval = inp->inp_flags & INP_HDRINCL;
 310                         error = sooptcopyout(sopt, &optval, sizeof optval);
 311                         break;
 312
 313         case IP_STRIPHDR:
 314             optval = inp->inp_flags & INP_STRIPHDR;
 315             error = sooptcopyout(sopt, &optval, sizeof optval);
 316             break;
 317
 318 #if COMPAT_IPFW
 319                 case IP_FW_GET:
 320                         if (ip_fw_ctl_ptr == 0)
 321                                 error = ENOPROTOOPT;
 322                         else
 323                                 error = ip_fw_ctl_ptr(sopt);
 324                         break;
 325
 326                 case IP_NAT:
 327                         if (ip_nat_ctl_ptr == 0)
 328                                 error = ENOPROTOOPT;
 329                         else
 330                                 error = ip_nat_ctl_ptr(sopt);
 331                         break;
 332 #if DUMMYNET
 333                 case IP_DUMMYNET_GET:
 334                         if (ip_dn_ctl_ptr == NULL)
 335                                 error = ENOPROTOOPT ;
 336                         else
 337                                 error = ip_dn_ctl_ptr(sopt);
 338                         break ;
 339 #endif /* DUMMYNET */
 340 #endif /* COMPAT_IPFW */
 341
 342                 case MRT_INIT:
 343                 case MRT_DONE:
 344                 case MRT_ADD_VIF:
 345                 case MRT_DEL_VIF:
 346                 case MRT_ADD_MFC:
 347                 case MRT_DEL_MFC:
 348                 case MRT_VERSION:
 349                 case MRT_ASSERT:
 350                         error = ip_mrouter_get(so, sopt);
 351                         break;
 352
 353                 default:
 354                         error = ip_ctloutput(so, sopt);
 355                         break;
 356                 }
 357                 break;
 358
 359         case SOPT_SET:
 360                 switch (sopt->sopt_name) {
 361                 case IP_HDRINCL:
 362                         error = sooptcopyin(sopt, &optval, sizeof optval,
 363                                             sizeof optval);
 364                         if (error)
 365                                 break;
 366                         if (optval)
 367                                 inp->inp_flags |= INP_HDRINCL;
 368                         else
 369                                 inp->inp_flags &= ~INP_HDRINCL;
 370                         break;
 371
 372         case IP_STRIPHDR:
 373             error = sooptcopyin(sopt, &optval, sizeof optval,
 374                         sizeof optval);
 375             if (error)
 376                 break;
 377             if (optval)
 378                 inp->inp_flags |= INP_STRIPHDR;
 379             else
 380                 inp->inp_flags &= ~INP_STRIPHDR;
 381             break;
 382
 383
 384 #if COMPAT_IPFW
 385                 case IP_FW_ADD:
 386                 case IP_FW_DEL:
 387                 case IP_FW_FLUSH:
 388                 case IP_FW_ZERO:
 389                         if (ip_fw_ctl_ptr == 0)
 390                                 error = ENOPROTOOPT;
 391                         else
 392                                 error = ip_fw_ctl_ptr(sopt);
 393                         break;
 394
 395                 case IP_NAT:
 396                         if (ip_nat_ctl_ptr == 0)
 397                                 error = ENOPROTOOPT;
 398                         else
 399                                 error = ip_nat_ctl_ptr(sopt);
 400                         break;
 401 #if DUMMYNET
 402                 case IP_DUMMYNET_CONFIGURE:
 403                 case IP_DUMMYNET_DEL:
 404                 case IP_DUMMYNET_FLUSH:
 405                         if (ip_dn_ctl_ptr == NULL)
 406                                 error = ENOPROTOOPT ;
 407                         else
 408                                 error = ip_dn_ctl_ptr(sopt);
 409                         break ;
 410 #endif
 411 #endif /* COMPAT_IPFW */
 412
 413                 case IP_RSVP_ON:
 414                         error = ip_rsvp_init(so);
 415                         break;
 416
 417                 case IP_RSVP_OFF:
 418                         error = ip_rsvp_done();
 419                         break;
 420
 421                         /* XXX - should be combined */
 422                 case IP_RSVP_VIF_ON:
 423                         error = ip_rsvp_vif_init(so, sopt);
 424                         break;
 425
 426                 case IP_RSVP_VIF_OFF:
 427                         error = ip_rsvp_vif_done(so, sopt);
 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                         error = ip_mrouter_set(so, sopt);
 439                         break;
 440
 441                 default:
 442                         error = ip_ctloutput(so, sopt);
 443                         break;
 444                 }
 445                 break;
 446         }
 447
 448         return (error);
 449 }
 450
 451 /*
 452  * This function exists solely to receive the PRC_IFDOWN messages which
 453  * are sent by if_down().  It looks for an ifaddr whose ifa_addr is sa,
 454  * and calls in_ifadown() to remove all routes corresponding to that address.
 455  * It also receives the PRC_IFUP messages from if_up() and reinstalls the
 456  * interface routes.
 457  */
 458 void
 459 rip_ctlinput(cmd, sa, vip)
 460         int cmd;
 461         struct sockaddr *sa;
 462         void *vip;
 463 {
 464         struct in_ifaddr *ia;
 465         struct ifnet *ifp;
 466         int err;
 467         int flags;
 468
 469         switch (cmd) {
 470         case PRC_IFDOWN:
 471                 for (ia = in_ifaddrhead.tqh_first; ia;
 472                      ia = ia->ia_link.tqe_next) {
 473                         if (ia->ia_ifa.ifa_addr == sa
 474                             && (ia->ia_flags & IFA_ROUTE)) {
 475                                 /*
 476                                  * in_ifscrub kills the interface route.
 477                                  */
 478                                 in_ifscrub(ia->ia_ifp, ia);
 479                                 /*
 480                                  * in_ifadown gets rid of all the rest of
 481                                  * the routes.  This is not quite the right
 482                                  * thing to do, but at least if we are running
 483                                  * a routing process they will come back.
 484                                  */
 485                                 in_ifadown(&ia->ia_ifa);
 486                                 break;
 487                         }
 488                 }
 489                 break;
 490
 491         case PRC_IFUP:
 492                 for (ia = in_ifaddrhead.tqh_first; ia;
 493                      ia = ia->ia_link.tqe_next) {
 494                         if (ia->ia_ifa.ifa_addr == sa)
 495                                 break;
 496                 }
 497                 if (ia == 0 || (ia->ia_flags & IFA_ROUTE))
 498                         return;
 499                 flags = RTF_UP;
 500                 ifp = ia->ia_ifa.ifa_ifp;
 501
 502                 if ((ifp->if_flags & IFF_LOOPBACK)
 503                     || (ifp->if_flags & IFF_POINTOPOINT))
 504                         flags |= RTF_HOST;
 505
 506                 err = rtinit(&ia->ia_ifa, RTM_ADD, flags);
 507                 if (err == 0)
 508                         ia->ia_flags |= IFA_ROUTE;
 509                 break;
 510         }
 511 }
 512
 513 u_long  rip_sendspace = RIPSNDQ;
 514 u_long  rip_recvspace = RIPRCVQ;
 515
 516 SYSCTL_INT(_net_inet_raw, OID_AUTO, maxdgram, CTLFLAG_RW, &rip_sendspace,
 517            0, "");
 518 SYSCTL_INT(_net_inet_raw, OID_AUTO, recvspace, CTLFLAG_RW, &rip_recvspace,
 519            0, "");
 520
 521 static int
 522 rip_attach(struct socket *so, int proto, struct proc *p)
 523 {
 524         struct inpcb *inp;
 525         int error, s;
 526
 527         inp = sotoinpcb(so);
 528         if (inp)
 529                 panic("rip_attach");
 530
 531
 532 #if ISFB31
 533                 if (p && (error = suser(p->p_ucred, &p->p_acflag)) != 0)
 534                         return error;
 535 #else
 536                 if ((so->so_state & SS_PRIV) == 0)
 537                         return (EPERM);
 538 #endif
 539
 540         s = splnet();
 541         error = in_pcballoc(so, &ripcbinfo, p);
 542         splx(s);
 543         if (error)
 544                 return error;
 545         error = soreserve(so, rip_sendspace, rip_recvspace);
 546         if (error)
 547                 return error;
 548         inp = (struct inpcb *)so->so_pcb;
 549         inp->inp_vflag |= INP_IPV4;
 550         inp->inp_ip_p = proto;
 551 #if IPSEC
 552         error = ipsec_init_policy(so, &inp->inp_sp);
 553         if (error != 0) {
 554                 in_pcbdetach(inp);
 555                 return error;
 556         }
 557 #endif /*IPSEC*/
 558
 559         return 0;
 560 }
 561
 562 static int
 563 rip_detach(struct socket *so)
 564 {
 565         struct inpcb *inp;
 566
 567         inp = sotoinpcb(so);
 568         if (inp == 0)
 569                 panic("rip_detach");
 570         if (so == ip_mrouter)
 571                 ip_mrouter_done();
 572         ip_rsvp_force_done(so);
 573         if (so == ip_rsvpd)
 574                 ip_rsvp_done();
 575         in_pcbdetach(inp);
 576         return 0;
 577 }
 578
 579 static int
 580 rip_abort(struct socket *so)
 581 {
 582         soisdisconnected(so);
 583         return rip_detach(so);
 584 }
 585
 586 static int
 587 rip_disconnect(struct socket *so)
 588 {
 589         if ((so->so_state & SS_ISCONNECTED) == 0)
 590                 return ENOTCONN;
 591         return rip_abort(so);
 592 }
 593
 594 static int
 595 rip_bind(struct socket *so, struct sockaddr *nam, struct proc *p)
 596 {
 597         struct inpcb *inp = sotoinpcb(so);
 598         struct sockaddr_in *addr = (struct sockaddr_in *)nam;
 599
 600         if (nam->sa_len != sizeof(*addr))
 601                 return EINVAL;
 602
 603         if (TAILQ_EMPTY(&ifnet) || ((addr->sin_family != AF_INET) &&
 604                                     (addr->sin_family != AF_IMPLINK)) ||
 605             (addr->sin_addr.s_addr &&
 606              ifa_ifwithaddr((struct sockaddr *)addr) == 0))
 607                 return EADDRNOTAVAIL;
 608         inp->inp_laddr = addr->sin_addr;
 609         return 0;
 610 }
 611
 612 static int
 613 rip_connect(struct socket *so, struct sockaddr *nam, struct proc *p)
 614 {
 615         struct inpcb *inp = sotoinpcb(so);
 616         struct sockaddr_in *addr = (struct sockaddr_in *)nam;
 617
 618         if (nam->sa_len != sizeof(*addr))
 619                 return EINVAL;
 620         if (TAILQ_EMPTY(&ifnet))
 621                 return EADDRNOTAVAIL;
 622         if ((addr->sin_family != AF_INET) &&
 623             (addr->sin_family != AF_IMPLINK))
 624                 return EAFNOSUPPORT;
 625         inp->inp_faddr = addr->sin_addr;
 626         soisconnected(so);
 627         return 0;
 628 }
 629
 630 static int
 631 rip_shutdown(struct socket *so)
 632 {
 633         socantsendmore(so);
 634         return 0;
 635 }
 636
 637 static int
 638 rip_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
 639          struct mbuf *control, struct proc *p)
 640 {
 641         struct inpcb *inp = sotoinpcb(so);
 642         register u_long dst;
 643
 644         if (so->so_state & SS_ISCONNECTED) {
 645                 if (nam) {
 646                         m_freem(m);
 647                         return EISCONN;
 648                 }
 649                 dst = inp->inp_faddr.s_addr;
 650         } else {
 651                 if (nam == NULL) {
 652                         m_freem(m);
 653                         return ENOTCONN;
 654                 }
 655                 dst = ((struct sockaddr_in *)nam)->sin_addr.s_addr;
 656         }
 657         return rip_output(m, so, dst);
 658 }
 659
 660
 661 static int
 662 rip_pcblist SYSCTL_HANDLER_ARGS
 663 {
 664         int error, i, n, s;
 665         struct inpcb *inp, **inp_list;
 666         inp_gen_t gencnt;
 667         struct xinpgen xig;
 668
 669         /*
 670          * The process of preparing the TCB list is too time-consuming and
 671          * resource-intensive to repeat twice on every request.
 672          */
 673         if (req->oldptr == 0) {
 674                 n = ripcbinfo.ipi_count;
 675                 req->oldidx = 2 * (sizeof xig)
 676                         + (n + n/8) * sizeof(struct xinpcb);
 677                 return 0;
 678         }
 679
 680         if (req->newptr != 0)
 681                 return EPERM;
 682
 683         /*
 684          * OK, now we're committed to doing something.
 685          */
 686         s = splnet();
 687         gencnt = ripcbinfo.ipi_gencnt;
 688         n = ripcbinfo.ipi_count;
 689         splx(s);
 690
 691         xig.xig_len = sizeof xig;
 692         xig.xig_count = n;
 693         xig.xig_gen = gencnt;
 694         xig.xig_sogen = so_gencnt;
 695         error = SYSCTL_OUT(req, &xig, sizeof xig);
 696         if (error)
 697                 return error;
 698
 699         inp_list = _MALLOC(n * sizeof *inp_list, M_TEMP, M_WAITOK);
 700         if (inp_list == 0)
 701                 return ENOMEM;
 702
 703         s = splnet();
 704         for (inp = ripcbinfo.listhead->lh_first, i = 0; inp && i < n;
 705              inp = inp->inp_list.le_next) {
 706                 if (inp->inp_gencnt <= gencnt)
 707                         inp_list[i++] = inp;
 708         }
 709         splx(s);
 710         n = i;
 711
 712         error = 0;
 713         for (i = 0; i < n; i++) {
 714                 inp = inp_list[i];
 715                 if (inp->inp_gencnt <= gencnt) {
 716                         struct xinpcb xi;
 717                         xi.xi_len = sizeof xi;
 718                         /* XXX should avoid extra copy */
 719                         bcopy(inp, &xi.xi_inp, sizeof *inp);
 720                         if (inp->inp_socket)
 721                                 sotoxsocket(inp->inp_socket, &xi.xi_socket);
 722                         error = SYSCTL_OUT(req, &xi, sizeof xi);
 723                 }
 724         }
 725         if (!error) {
 726                 /*
 727                  * Give the user an updated idea of our state.
 728                  * If the generation differs from what we told
 729                  * her before, she knows that something happened
 730                  * while we were processing this request, and it
 731                  * might be necessary to retry.
 732                  */
 733                 s = splnet();
 734                 xig.xig_gen = ripcbinfo.ipi_gencnt;
 735                 xig.xig_sogen = so_gencnt;
 736                 xig.xig_count = ripcbinfo.ipi_count;
 737                 splx(s);
 738                 error = SYSCTL_OUT(req, &xig, sizeof xig);
 739         }
 740         FREE(inp_list, M_TEMP);
 741         return error;
 742 }
 743
 744
 745 SYSCTL_PROC(_net_inet_raw, OID_AUTO/*XXX*/, pcblist, CTLFLAG_RD, 0, 0,
 746             rip_pcblist, "S,xinpcb", "List of active raw IP sockets");
 747
 748 struct pr_usrreqs rip_usrreqs = {
 749         rip_abort, pru_accept_notsupp, rip_attach, rip_bind, rip_connect,
 750         pru_connect2_notsupp, in_control, rip_detach, rip_disconnect,
 751         pru_listen_notsupp, in_setpeeraddr, pru_rcvd_notsupp,
 752         pru_rcvoob_notsupp, rip_send, pru_sense_null, rip_shutdown,
 753         in_setsockaddr, sosend, soreceive, sopoll
 754 };