ipx_outputfl.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_outputfl.c
   35  *
   36  * $FreeBSD$
   37  */
   38 
   39 #include <sys/param.h>
   40 #include <sys/systm.h>
   41 #include <sys/mbuf.h>
   42 #include <sys/socket.h>
   43 
   44 #include <net/if.h>
   45 #include <net/route.h>
   46 
   47 #include <netipx/ipx.h>
   48 #include <netipx/ipx_if.h>
   49 #include <netipx/ipx_var.h>
   50 
   51 #ifdef vax
   52 #include <machine/mtpr.h>
   53 #endif
   54 
   55 static int ipx_copy_output = 0;
   56 
   57 int
   58 ipx_outputfl(m0, ro, flags)
   59         struct mbuf *m0;
   60         struct route *ro;
   61         int flags;
   62 {
   63         register struct ipx *ipx = mtod(m0, struct ipx *);
   64         register struct ifnet *ifp = NULL;
   65         int error = 0;
   66         struct sockaddr_ipx *dst;
   67         struct route ipxroute;
   68 
   69         /*
   70          * Route packet.
   71          */
   72         if (ro == NULL) {
   73                 ro = &ipxroute;
   74                 bzero((caddr_t)ro, sizeof(*ro));
   75         }
   76         dst = (struct sockaddr_ipx *)&ro->ro_dst;
   77         if (ro->ro_rt == NULL) {
   78                 dst->sipx_family = AF_IPX;
   79                 dst->sipx_len = sizeof(*dst);
   80                 dst->sipx_addr = ipx->ipx_dna;
   81                 dst->sipx_addr.x_port = 0;
   82                 /*
   83                  * If routing to interface only,
   84                  * short circuit routing lookup.
   85                  */
   86                 if (flags & IPX_ROUTETOIF) {
   87                         struct ipx_ifaddr *ia = ipx_iaonnetof(&ipx->ipx_dna);
   88 
   89                         if (ia == NULL) {
   90                                 ipxstat.ipxs_noroute++;
   91                                 error = ENETUNREACH;
   92                                 goto bad;
   93                         }
   94                         ifp = ia->ia_ifp;
   95                         goto gotif;
   96                 }
   97                 rtalloc(ro);
   98         } else if ((ro->ro_rt->rt_flags & RTF_UP) == 0) {
   99                 /*
  100                  * The old route has gone away; try for a new one.
  101                  */
  102                 rtfree(ro->ro_rt);
  103                 ro->ro_rt = NULL;
  104                 rtalloc(ro);
  105         }
  106         if (ro->ro_rt == NULL || (ifp = ro->ro_rt->rt_ifp) == NULL) {
  107                 ipxstat.ipxs_noroute++;
  108                 error = ENETUNREACH;
  109                 goto bad;
  110         }
  111         ro->ro_rt->rt_use++;
  112         if (ro->ro_rt->rt_flags & (RTF_GATEWAY|RTF_HOST))
  113                 dst = (struct sockaddr_ipx *)ro->ro_rt->rt_gateway;
  114 gotif:
  115         /*
  116          * Look for multicast addresses and
  117          * and verify user is allowed to send
  118          * such a packet.
  119          */
  120         if (dst->sipx_addr.x_host.c_host[0]&1) {
  121                 if ((ifp->if_flags & (IFF_BROADCAST | IFF_LOOPBACK)) == 0) {
  122                         error = EADDRNOTAVAIL;
  123                         goto bad;
  124                 }
  125                 if ((flags & IPX_ALLOWBROADCAST) == 0) {
  126                         error = EACCES;
  127                         goto bad;
  128                 }
  129                 m0->m_flags |= M_BCAST;
  130         }
  131 
  132         if (htons(ipx->ipx_len) <= ifp->if_mtu) {
  133                 ipxstat.ipxs_localout++;
  134                 if (ipx_copy_output) {
  135                         ipx_watch_output(m0, ifp);
  136                 }
  137                 error = (*ifp->if_output)(ifp, m0,
  138                                         (struct sockaddr *)dst, ro->ro_rt);
  139                 goto done;
  140         } else {
  141                 ipxstat.ipxs_mtutoosmall++;
  142                 error = EMSGSIZE;
  143         }
  144 bad:
  145         if (ipx_copy_output) {
  146                 ipx_watch_output(m0, ifp);
  147         }
  148         m_freem(m0);
  149 done:
  150         if (ro == &ipxroute && (flags & IPX_ROUTETOIF) == 0 &&
  151             ro->ro_rt != NULL) {
  152                 RTFREE(ro->ro_rt);
  153                 ro->ro_rt = NULL;
  154         }
  155         return (error);
  156 }
  157 
  158 /*
  159  * This will broadcast the type 20 (Netbios) packet to all the interfaces
  160  * that have ipx configured and isn't in the list yet.
  161  */
  162 int
  163 ipx_output_type20(m)
  164         struct mbuf *m;
  165 {
  166         register struct ipx *ipx;
  167         union ipx_net *nbnet = (union ipx_net *)(ipx + 1);
  168         struct ipx_ifaddr *ia, *tia = NULL;
  169         int error = 0;
  170         struct mbuf *m1;
  171         int i;
  172         struct ifnet *ifp;
  173         struct sockaddr_ipx dst;
  174 
  175         /*
  176          * We have to get to the 32 bytes after the ipx header also, so
  177          * that we can fill in the network address of the receiving
  178          * interface.
  179          */
  180         if ((m->m_flags & M_EXT || m->m_len < (sizeof(struct ipx) + 32)) &&
  181             (m = m_pullup(m, sizeof(struct ipx) + 32)) == NULL) {
  182                 ipxstat.ipxs_toosmall++;
  183                 return (0);
  184         }
  185         ipx = mtod(m, struct ipx *);
  186         nbnet = (union ipx_net *)(ipx + 1);
  187 
  188         if (ipx->ipx_tc >= 8)
  189                 goto bad;
  190         /*
  191          * Now see if we have already seen this.
  192          */
  193         for (ia = ipx_ifaddr; ia != NULL; ia = ia->ia_next)
  194                 if(ia->ia_ifa.ifa_ifp == m->m_pkthdr.rcvif) {
  195                         if(tia == NULL)
  196                                 tia = ia;
  197 
  198                         for (i=0;i<ipx->ipx_tc;i++,nbnet++)
  199                                 if(ipx_neteqnn(ia->ia_addr.sipx_addr.x_net,
  200                                                         *nbnet))
  201                                         goto bad;
  202                 }
  203         /*
  204          * Don't route the packet if the interface where it come from
  205          * does not have an IPX address.
  206          */
  207         if(tia == NULL)
  208                 goto bad;
  209 
  210         /*
  211          * Add our receiving interface to the list.
  212          */
  213         nbnet = (union ipx_net *)(ipx + 1);
  214         nbnet += ipx->ipx_tc;
  215         *nbnet = tia->ia_addr.sipx_addr.x_net;
  216 
  217         /*
  218          * Increment the hop count.
  219          */
  220         ipx->ipx_tc++;
  221         ipxstat.ipxs_forward++;
  222 
  223         /*
  224          * Send to all directly connected ifaces not in list and
  225          * not to the one it came from.
  226          */
  227         m->m_flags &= ~M_BCAST;
  228         bzero(&dst, sizeof(dst));
  229         dst.sipx_family = AF_IPX;
  230         dst.sipx_len = 12;
  231         dst.sipx_addr.x_host = ipx_broadhost;
  232 
  233         for (ia = ipx_ifaddr; ia != NULL; ia = ia->ia_next)
  234                 if(ia->ia_ifa.ifa_ifp != m->m_pkthdr.rcvif) {
  235                         nbnet = (union ipx_net *)(ipx + 1);
  236                         for (i=0;i<ipx->ipx_tc;i++,nbnet++)
  237                                 if(ipx_neteqnn(ia->ia_addr.sipx_addr.x_net,
  238                                                         *nbnet))
  239                                         goto skip_this;
  240 
  241                         /*
  242                          * Insert the net address of the dest net and
  243                          * calculate the new checksum if needed.
  244                          */
  245                         ifp = ia->ia_ifa.ifa_ifp;
  246                         dst.sipx_addr.x_net = ia->ia_addr.sipx_addr.x_net;
  247                         ipx->ipx_dna.x_net = dst.sipx_addr.x_net;
  248                         m1 = m_copym(m, 0, M_COPYALL, M_DONTWAIT);
  249 
  250                         if(ipx->ipx_sum != 0xffff)
  251                                 ipx->ipx_sum = ipx_cksum(m, ntohs(ipx->ipx_len));
  252                         if(m1) {
  253                                 error = (*ifp->if_output)(ifp, m1,
  254                                         (struct sockaddr *)&dst, NULL);
  255                                 /* XXX ipxstat.ipxs_localout++; */
  256                         }
  257 skip_this: ;
  258                 }
  259 
  260 bad:
  261         m_freem(m);
  262         return (error);
  263 }

Cache object: 8df994488e897637020525d9d5afd54a

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FreeBSD/Linux Kernel Cross Reference sys/netipx/ipx_outputfl.c

FreeBSD/Linux Kernel Cross Reference
sys/netipx/ipx_outputfl.c