The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netipx/ipx_input.c

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    1 /*
    2  * Copyright (c) 1995, Mike Mitchell
    3  * Copyright (c) 1984, 1985, 1986, 1987, 1993
    4  *      The Regents of the University of California.  All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 3. All advertising materials mentioning features or use of this software
   15  *    must display the following acknowledgement:
   16  *      This product includes software developed by the University of
   17  *      California, Berkeley and its contributors.
   18  * 4. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  *      @(#)ipx_input.c
   35  */
   36 
   37 #include <sys/cdefs.h>
   38 __FBSDID("$FreeBSD: releng/5.3/sys/netipx/ipx_input.c 136588 2004-10-16 08:43:07Z cvs2svn $");
   39 
   40 #include <sys/param.h>
   41 #include <sys/systm.h>
   42 #include <sys/mbuf.h>
   43 #include <sys/protosw.h>
   44 #include <sys/socket.h>
   45 #include <sys/kernel.h>
   46 #include <sys/random.h>
   47 #include <sys/sysctl.h>
   48 
   49 #include <net/if.h>
   50 #include <net/route.h>
   51 #include <net/netisr.h>
   52 
   53 #include <netipx/ipx.h>
   54 #include <netipx/spx.h>
   55 #include <netipx/ipx_if.h>
   56 #include <netipx/ipx_pcb.h>
   57 #include <netipx/ipx_var.h>
   58 
   59 int     ipxcksum = 0;
   60 SYSCTL_INT(_net_ipx_ipx, OID_AUTO, checksum, CTLFLAG_RW,
   61            &ipxcksum, 0, "");
   62 
   63 static int      ipxprintfs = 0;         /* printing forwarding information */
   64 SYSCTL_INT(_net_ipx_ipx, OID_AUTO, ipxprintfs, CTLFLAG_RW,
   65            &ipxprintfs, 0, "");
   66 
   67 static int      ipxforwarding = 0;
   68 SYSCTL_INT(_net_ipx_ipx, OID_AUTO, ipxforwarding, CTLFLAG_RW,
   69             &ipxforwarding, 0, "");
   70 
   71 static int      ipxnetbios = 0;
   72 SYSCTL_INT(_net_ipx, OID_AUTO, ipxnetbios, CTLFLAG_RW,
   73            &ipxnetbios, 0, "");
   74 
   75 union   ipx_net ipx_zeronet;
   76 union   ipx_host ipx_zerohost;
   77 
   78 union   ipx_net ipx_broadnet;
   79 union   ipx_host ipx_broadhost;
   80 
   81 struct  ipxstat ipxstat;
   82 struct  sockaddr_ipx ipx_netmask, ipx_hostmask;
   83 
   84 static  u_short allones[] = {-1, -1, -1};
   85 
   86 struct  ipxpcb ipxpcb;
   87 struct  ipxpcb ipxrawpcb;
   88 
   89 static int ipxqmaxlen = IFQ_MAXLEN;
   90 static  struct ifqueue ipxintrq;
   91 
   92 long    ipx_pexseq;
   93 
   94 static  int ipx_do_route(struct ipx_addr *src, struct route *ro);
   95 static  void ipx_undo_route(struct route *ro);
   96 static  void ipx_forward(struct mbuf *m);
   97 static  void ipxintr(struct mbuf *m);
   98 
   99 /*
  100  * IPX initialization.
  101  */
  102 
  103 void
  104 ipx_init()
  105 {
  106         ipx_broadnet = *(union ipx_net *)allones;
  107         ipx_broadhost = *(union ipx_host *)allones;
  108 
  109         read_random(&ipx_pexseq, sizeof ipx_pexseq);
  110         ipxpcb.ipxp_next = ipxpcb.ipxp_prev = &ipxpcb;
  111         ipxrawpcb.ipxp_next = ipxrawpcb.ipxp_prev = &ipxrawpcb;
  112 
  113         ipx_netmask.sipx_len = 6;
  114         ipx_netmask.sipx_addr.x_net = ipx_broadnet;
  115 
  116         ipx_hostmask.sipx_len = 12;
  117         ipx_hostmask.sipx_addr.x_net = ipx_broadnet;
  118         ipx_hostmask.sipx_addr.x_host = ipx_broadhost;
  119 
  120         ipxintrq.ifq_maxlen = ipxqmaxlen;
  121         mtx_init(&ipxintrq.ifq_mtx, "ipx_inq", NULL, MTX_DEF);
  122         netisr_register(NETISR_IPX, ipxintr, &ipxintrq, 0);
  123 }
  124 
  125 /*
  126  * IPX input routine.  Pass to next level.
  127  */
  128 static void
  129 ipxintr(struct mbuf *m)
  130 {
  131         register struct ipx *ipx;
  132         register struct ipxpcb *ipxp;
  133         struct ipx_ifaddr *ia;
  134         int len;
  135 
  136         GIANT_REQUIRED;
  137 
  138         /*
  139          * If no IPX addresses have been set yet but the interfaces
  140          * are receiving, can't do anything with incoming packets yet.
  141          */
  142         if (ipx_ifaddr == NULL)
  143                 goto bad;
  144 
  145         ipxstat.ipxs_total++;
  146 
  147         if ((m->m_flags & M_EXT || m->m_len < sizeof(struct ipx)) &&
  148             (m = m_pullup(m, sizeof(struct ipx))) == 0) {
  149                 ipxstat.ipxs_toosmall++;
  150                 return;
  151         }
  152 
  153         /*
  154          * Give any raw listeners a crack at the packet
  155          */
  156         for (ipxp = ipxrawpcb.ipxp_next; ipxp != &ipxrawpcb;
  157              ipxp = ipxp->ipxp_next) {
  158                 struct mbuf *m1 = m_copy(m, 0, (int)M_COPYALL);
  159                 if (m1 != NULL)
  160                         ipx_input(m1, ipxp);
  161         }
  162 
  163         ipx = mtod(m, struct ipx *);
  164         len = ntohs(ipx->ipx_len);
  165         /*
  166          * Check that the amount of data in the buffers
  167          * is as at least much as the IPX header would have us expect.
  168          * Trim mbufs if longer than we expect.
  169          * Drop packet if shorter than we expect.
  170          */
  171         if (m->m_pkthdr.len < len) {
  172                 ipxstat.ipxs_tooshort++;
  173                 goto bad;
  174         }
  175         if (m->m_pkthdr.len > len) {
  176                 if (m->m_len == m->m_pkthdr.len) {
  177                         m->m_len = len;
  178                         m->m_pkthdr.len = len;
  179                 } else
  180                         m_adj(m, len - m->m_pkthdr.len);
  181         }
  182         if (ipxcksum && ipx->ipx_sum != 0xffff) {
  183                 if (ipx->ipx_sum != ipx_cksum(m, len)) {
  184                         ipxstat.ipxs_badsum++;
  185                         goto bad;
  186                 }
  187         }
  188 
  189         /*
  190          * Propagated (Netbios) packets (type 20) has to be handled
  191          * different. :-(
  192          */
  193         if (ipx->ipx_pt == IPXPROTO_NETBIOS) {
  194                 if (ipxnetbios) {
  195                         ipx_output_type20(m);
  196                         return;
  197                 } else
  198                         goto bad;
  199         }
  200 
  201         /*
  202          * Is this a directed broadcast?
  203          */
  204         if (ipx_hosteqnh(ipx_broadhost,ipx->ipx_dna.x_host)) {
  205                 if ((!ipx_neteq(ipx->ipx_dna, ipx->ipx_sna)) &&
  206                     (!ipx_neteqnn(ipx->ipx_dna.x_net, ipx_broadnet)) &&
  207                     (!ipx_neteqnn(ipx->ipx_sna.x_net, ipx_zeronet)) &&
  208                     (!ipx_neteqnn(ipx->ipx_dna.x_net, ipx_zeronet)) ) {
  209                         /*
  210                          * If it is a broadcast to the net where it was
  211                          * received from, treat it as ours.
  212                          */
  213                         for (ia = ipx_ifaddr; ia != NULL; ia = ia->ia_next)
  214                                 if((ia->ia_ifa.ifa_ifp == m->m_pkthdr.rcvif) &&
  215                                    ipx_neteq(ia->ia_addr.sipx_addr, 
  216                                              ipx->ipx_dna))
  217                                         goto ours;
  218 
  219                         /*
  220                          * Look to see if I need to eat this packet.
  221                          * Algorithm is to forward all young packets
  222                          * and prematurely age any packets which will
  223                          * by physically broadcasted.
  224                          * Any very old packets eaten without forwarding
  225                          * would die anyway.
  226                          *
  227                          * Suggestion of Bill Nesheim, Cornell U.
  228                          */
  229                         if (ipx->ipx_tc < IPX_MAXHOPS) {
  230                                 ipx_forward(m);
  231                                 return;
  232                         }
  233                 }
  234         /*
  235          * Is this our packet? If not, forward.
  236          */
  237         } else {
  238                 for (ia = ipx_ifaddr; ia != NULL; ia = ia->ia_next)
  239                         if (ipx_hosteq(ipx->ipx_dna, ia->ia_addr.sipx_addr) &&
  240                             (ipx_neteq(ipx->ipx_dna, ia->ia_addr.sipx_addr) ||
  241                              ipx_neteqnn(ipx->ipx_dna.x_net, ipx_zeronet)))
  242                                 break;
  243 
  244                 if (ia == NULL) {
  245                         ipx_forward(m);
  246                         return;
  247                 }
  248         }
  249 ours:
  250         /*
  251          * Locate pcb for datagram.
  252          */
  253         ipxp = ipx_pcblookup(&ipx->ipx_sna, ipx->ipx_dna.x_port, IPX_WILDCARD);
  254         /*
  255          * Switch out to protocol's input routine.
  256          */
  257         if (ipxp != NULL) {
  258                 ipxstat.ipxs_delivered++;
  259                 if ((ipxp->ipxp_flags & IPXP_ALL_PACKETS) == 0)
  260                         switch (ipx->ipx_pt) {
  261                         case IPXPROTO_SPX:
  262                                 spx_input(m, ipxp);
  263                                 return;
  264                         }
  265                 ipx_input(m, ipxp);
  266         } else
  267                 goto bad;
  268 
  269         return;
  270 
  271 bad:
  272         m_freem(m);
  273 }
  274 
  275 void
  276 ipx_ctlinput(cmd, arg_as_sa, dummy)
  277         int cmd;
  278         struct sockaddr *arg_as_sa;     /* XXX should be swapped with dummy */
  279         void *dummy;
  280 {
  281         caddr_t arg = (/* XXX */ caddr_t)arg_as_sa;
  282         struct ipx_addr *ipx;
  283 
  284         if (cmd < 0 || cmd >= PRC_NCMDS)
  285                 return;
  286         switch (cmd) {
  287                 struct sockaddr_ipx *sipx;
  288 
  289         case PRC_IFDOWN:
  290         case PRC_HOSTDEAD:
  291         case PRC_HOSTUNREACH:
  292                 sipx = (struct sockaddr_ipx *)arg;
  293                 if (sipx->sipx_family != AF_IPX)
  294                         return;
  295                 ipx = &sipx->sipx_addr;
  296                 break;
  297 
  298         default:
  299                 if (ipxprintfs)
  300                         printf("ipx_ctlinput: cmd %d.\n", cmd);
  301                 break;
  302         }
  303 }
  304 
  305 /*
  306  * Forward a packet. If some error occurs drop the packet. IPX don't
  307  * have a way to return errors to the sender.
  308  */
  309 
  310 static struct route ipx_droute;
  311 static struct route ipx_sroute;
  312 
  313 static void
  314 ipx_forward(m)
  315 struct mbuf *m;
  316 {
  317         register struct ipx *ipx = mtod(m, struct ipx *);
  318         register int error;
  319         struct mbuf *mcopy = NULL;
  320         int agedelta = 1;
  321         int flags = IPX_FORWARDING;
  322         int ok_there = 0;
  323         int ok_back = 0;
  324 
  325         if (ipxforwarding == 0) {
  326                 /* can't tell difference between net and host */
  327                 ipxstat.ipxs_cantforward++;
  328                 m_freem(m);
  329                 goto cleanup;
  330         }
  331         ipx->ipx_tc++;
  332         if (ipx->ipx_tc > IPX_MAXHOPS) {
  333                 ipxstat.ipxs_cantforward++;
  334                 m_freem(m);
  335                 goto cleanup;
  336         }
  337 
  338         if ((ok_there = ipx_do_route(&ipx->ipx_dna,&ipx_droute)) == 0) {
  339                 ipxstat.ipxs_noroute++;
  340                 m_freem(m);
  341                 goto cleanup;
  342         }
  343         /*
  344          * Here we think about  forwarding  broadcast packets,
  345          * so we try to insure that it doesn't go back out
  346          * on the interface it came in on.  Also, if we
  347          * are going to physically broadcast this, let us
  348          * age the packet so we can eat it safely the second time around.
  349          */
  350         if (ipx->ipx_dna.x_host.c_host[0] & 0x1) {
  351                 struct ipx_ifaddr *ia = ipx_iaonnetof(&ipx->ipx_dna);
  352                 struct ifnet *ifp;
  353                 if (ia != NULL) {
  354                         /* I'm gonna hafta eat this packet */
  355                         agedelta += IPX_MAXHOPS - ipx->ipx_tc;
  356                         ipx->ipx_tc = IPX_MAXHOPS;
  357                 }
  358                 if ((ok_back = ipx_do_route(&ipx->ipx_sna,&ipx_sroute)) == 0) {
  359                         /* error = ENETUNREACH; He'll never get it! */
  360                         ipxstat.ipxs_noroute++;
  361                         m_freem(m);
  362                         goto cleanup;
  363                 }
  364                 if (ipx_droute.ro_rt &&
  365                     (ifp = ipx_droute.ro_rt->rt_ifp) &&
  366                     ipx_sroute.ro_rt &&
  367                     (ifp != ipx_sroute.ro_rt->rt_ifp)) {
  368                         flags |= IPX_ALLOWBROADCAST;
  369                 } else {
  370                         ipxstat.ipxs_noroute++;
  371                         m_freem(m);
  372                         goto cleanup;
  373                 }
  374         }
  375         /*
  376          * We don't need to recompute checksum because ipx_tc field
  377          * is ignored by checksum calculation routine, however
  378          * it may be desirable to reset checksum if ipxcksum == 0
  379          */
  380 #if 0
  381         if (!ipxcksum)
  382                 ipx->ipx_sum = 0xffff;
  383 #endif
  384 
  385         error = ipx_outputfl(m, &ipx_droute, flags);
  386         if (error == 0) {
  387                 ipxstat.ipxs_forward++;
  388 
  389                 if (ipxprintfs) {
  390                         printf("forward: ");
  391                         ipx_printhost(&ipx->ipx_sna);
  392                         printf(" to ");
  393                         ipx_printhost(&ipx->ipx_dna);
  394                         printf(" hops %d\n", ipx->ipx_tc);
  395                 }
  396         } else if (mcopy != NULL) {
  397                 ipx = mtod(mcopy, struct ipx *);
  398                 switch (error) {
  399 
  400                 case ENETUNREACH:
  401                 case EHOSTDOWN:
  402                 case EHOSTUNREACH:
  403                 case ENETDOWN:
  404                 case EPERM:
  405                         ipxstat.ipxs_noroute++;
  406                         break;
  407 
  408                 case EMSGSIZE:
  409                         ipxstat.ipxs_mtutoosmall++;
  410                         break;
  411 
  412                 case ENOBUFS:
  413                         ipxstat.ipxs_odropped++;
  414                         break;
  415                 }
  416                 mcopy = NULL;
  417                 m_freem(m);
  418         }
  419 cleanup:
  420         if (ok_there)
  421                 ipx_undo_route(&ipx_droute);
  422         if (ok_back)
  423                 ipx_undo_route(&ipx_sroute);
  424         if (mcopy != NULL)
  425                 m_freem(mcopy);
  426 }
  427 
  428 static int
  429 ipx_do_route(src, ro)
  430 struct ipx_addr *src;
  431 struct route *ro;
  432 {
  433         struct sockaddr_ipx *dst;
  434 
  435         bzero((caddr_t)ro, sizeof(*ro));
  436         dst = (struct sockaddr_ipx *)&ro->ro_dst;
  437 
  438         dst->sipx_len = sizeof(*dst);
  439         dst->sipx_family = AF_IPX;
  440         dst->sipx_addr = *src;
  441         dst->sipx_addr.x_port = 0;
  442         rtalloc(ro);
  443         if (ro->ro_rt == NULL || ro->ro_rt->rt_ifp == NULL) {
  444                 return (0);
  445         }
  446         ro->ro_rt->rt_use++;
  447         return (1);
  448 }
  449 
  450 static void
  451 ipx_undo_route(ro)
  452 register struct route *ro;
  453 {
  454         if (ro->ro_rt != NULL) {
  455                 RTFREE(ro->ro_rt);
  456         }
  457 }
  458 
  459 void
  460 ipx_watch_output(m, ifp)
  461 struct mbuf *m;
  462 struct ifnet *ifp;
  463 {
  464         register struct ipxpcb *ipxp;
  465         register struct ifaddr *ifa;
  466         register struct ipx_ifaddr *ia;
  467         /*
  468          * Give any raw listeners a crack at the packet
  469          */
  470         for (ipxp = ipxrawpcb.ipxp_next; ipxp != &ipxrawpcb;
  471              ipxp = ipxp->ipxp_next) {
  472                 struct mbuf *m0 = m_copy(m, 0, (int)M_COPYALL);
  473                 if (m0 != NULL) {
  474                         register struct ipx *ipx;
  475 
  476                         M_PREPEND(m0, sizeof(*ipx), M_DONTWAIT);
  477                         if (m0 == NULL)
  478                                 continue;
  479                         ipx = mtod(m0, struct ipx *);
  480                         ipx->ipx_sna.x_net = ipx_zeronet;
  481                         for (ia = ipx_ifaddr; ia != NULL; ia = ia->ia_next)
  482                                 if (ifp == ia->ia_ifp)
  483                                         break;
  484                         if (ia == NULL)
  485                                 ipx->ipx_sna.x_host = ipx_zerohost;  
  486                         else 
  487                                 ipx->ipx_sna.x_host =
  488                                     ia->ia_addr.sipx_addr.x_host;
  489 
  490                         if (ifp != NULL && (ifp->if_flags & IFF_POINTOPOINT))
  491                             TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  492                                 if (ifa->ifa_addr->sa_family == AF_IPX) {
  493                                     ipx->ipx_sna = IA_SIPX(ifa)->sipx_addr;
  494                                     break;
  495                                 }
  496                             }
  497                         ipx->ipx_len = ntohl(m0->m_pkthdr.len);
  498                         ipx_input(m0, ipxp);
  499                 }
  500         }
  501 }

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