The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netipx/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: releng/5.0/sys/netipx/ipx_outputfl.c 85958 2001-11-03 08:24:00Z peter $
   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 static int ipx_copy_output = 0;
   52 
   53 int
   54 ipx_outputfl(m0, ro, flags)
   55         struct mbuf *m0;
   56         struct route *ro;
   57         int flags;
   58 {
   59         register struct ipx *ipx = mtod(m0, struct ipx *);
   60         register struct ifnet *ifp = NULL;
   61         int error = 0;
   62         struct sockaddr_ipx *dst;
   63         struct route ipxroute;
   64 
   65         /*
   66          * Route packet.
   67          */
   68         if (ro == NULL) {
   69                 ro = &ipxroute;
   70                 bzero((caddr_t)ro, sizeof(*ro));
   71         }
   72         dst = (struct sockaddr_ipx *)&ro->ro_dst;
   73         if (ro->ro_rt == NULL) {
   74                 dst->sipx_family = AF_IPX;
   75                 dst->sipx_len = sizeof(*dst);
   76                 dst->sipx_addr = ipx->ipx_dna;
   77                 dst->sipx_addr.x_port = 0;
   78                 /*
   79                  * If routing to interface only,
   80                  * short circuit routing lookup.
   81                  */
   82                 if (flags & IPX_ROUTETOIF) {
   83                         struct ipx_ifaddr *ia = ipx_iaonnetof(&ipx->ipx_dna);
   84 
   85                         if (ia == NULL) {
   86                                 ipxstat.ipxs_noroute++;
   87                                 error = ENETUNREACH;
   88                                 goto bad;
   89                         }
   90                         ifp = ia->ia_ifp;
   91                         goto gotif;
   92                 }
   93                 rtalloc(ro);
   94         } else if ((ro->ro_rt->rt_flags & RTF_UP) == 0) {
   95                 /*
   96                  * The old route has gone away; try for a new one.
   97                  */
   98                 rtfree(ro->ro_rt);
   99                 ro->ro_rt = NULL;
  100                 rtalloc(ro);
  101         }
  102         if (ro->ro_rt == NULL || (ifp = ro->ro_rt->rt_ifp) == NULL) {
  103                 ipxstat.ipxs_noroute++;
  104                 error = ENETUNREACH;
  105                 goto bad;
  106         }
  107         ro->ro_rt->rt_use++;
  108         if (ro->ro_rt->rt_flags & (RTF_GATEWAY|RTF_HOST))
  109                 dst = (struct sockaddr_ipx *)ro->ro_rt->rt_gateway;
  110 gotif:
  111         /*
  112          * Look for multicast addresses and
  113          * and verify user is allowed to send
  114          * such a packet.
  115          */
  116         if (dst->sipx_addr.x_host.c_host[0]&1) {
  117                 if ((ifp->if_flags & (IFF_BROADCAST | IFF_LOOPBACK)) == 0) {
  118                         error = EADDRNOTAVAIL;
  119                         goto bad;
  120                 }
  121                 if ((flags & IPX_ALLOWBROADCAST) == 0) {
  122                         error = EACCES;
  123                         goto bad;
  124                 }
  125                 m0->m_flags |= M_BCAST;
  126         }
  127 
  128         if (htons(ipx->ipx_len) <= ifp->if_mtu) {
  129                 ipxstat.ipxs_localout++;
  130                 if (ipx_copy_output) {
  131                         ipx_watch_output(m0, ifp);
  132                 }
  133                 error = (*ifp->if_output)(ifp, m0,
  134                                         (struct sockaddr *)dst, ro->ro_rt);
  135                 goto done;
  136         } else {
  137                 ipxstat.ipxs_mtutoosmall++;
  138                 error = EMSGSIZE;
  139         }
  140 bad:
  141         if (ipx_copy_output) {
  142                 ipx_watch_output(m0, ifp);
  143         }
  144         m_freem(m0);
  145 done:
  146         if (ro == &ipxroute && (flags & IPX_ROUTETOIF) == 0 &&
  147             ro->ro_rt != NULL) {
  148                 RTFREE(ro->ro_rt);
  149                 ro->ro_rt = NULL;
  150         }
  151         return (error);
  152 }
  153 
  154 /*
  155  * This will broadcast the type 20 (Netbios) packet to all the interfaces
  156  * that have ipx configured and isn't in the list yet.
  157  */
  158 int
  159 ipx_output_type20(m)
  160         struct mbuf *m;
  161 {
  162         register struct ipx *ipx;
  163         union ipx_net *nbnet;
  164         struct ipx_ifaddr *ia, *tia = NULL;
  165         int error = 0;
  166         struct mbuf *m1;
  167         int i;
  168         struct ifnet *ifp;
  169         struct sockaddr_ipx dst;
  170 
  171         /*
  172          * We have to get to the 32 bytes after the ipx header also, so
  173          * that we can fill in the network address of the receiving
  174          * interface.
  175          */
  176         if ((m->m_flags & M_EXT || m->m_len < (sizeof(struct ipx) + 32)) &&
  177             (m = m_pullup(m, sizeof(struct ipx) + 32)) == NULL) {
  178                 ipxstat.ipxs_toosmall++;
  179                 return (0);
  180         }
  181         ipx = mtod(m, struct ipx *);
  182         nbnet = (union ipx_net *)(ipx + 1);
  183 
  184         if (ipx->ipx_tc >= 8)
  185                 goto bad;
  186         /*
  187          * Now see if we have already seen this.
  188          */
  189         for (ia = ipx_ifaddr; ia != NULL; ia = ia->ia_next)
  190                 if(ia->ia_ifa.ifa_ifp == m->m_pkthdr.rcvif) {
  191                         if(tia == NULL)
  192                                 tia = ia;
  193 
  194                         for (i=0;i<ipx->ipx_tc;i++,nbnet++)
  195                                 if(ipx_neteqnn(ia->ia_addr.sipx_addr.x_net,
  196                                                         *nbnet))
  197                                         goto bad;
  198                 }
  199         /*
  200          * Don't route the packet if the interface where it come from
  201          * does not have an IPX address.
  202          */
  203         if(tia == NULL)
  204                 goto bad;
  205 
  206         /*
  207          * Add our receiving interface to the list.
  208          */
  209         nbnet = (union ipx_net *)(ipx + 1);
  210         nbnet += ipx->ipx_tc;
  211         *nbnet = tia->ia_addr.sipx_addr.x_net;
  212 
  213         /*
  214          * Increment the hop count.
  215          */
  216         ipx->ipx_tc++;
  217         ipxstat.ipxs_forward++;
  218 
  219         /*
  220          * Send to all directly connected ifaces not in list and
  221          * not to the one it came from.
  222          */
  223         m->m_flags &= ~M_BCAST;
  224         bzero(&dst, sizeof(dst));
  225         dst.sipx_family = AF_IPX;
  226         dst.sipx_len = 12;
  227         dst.sipx_addr.x_host = ipx_broadhost;
  228 
  229         for (ia = ipx_ifaddr; ia != NULL; ia = ia->ia_next)
  230                 if(ia->ia_ifa.ifa_ifp != m->m_pkthdr.rcvif) {
  231                         nbnet = (union ipx_net *)(ipx + 1);
  232                         for (i=0;i<ipx->ipx_tc;i++,nbnet++)
  233                                 if(ipx_neteqnn(ia->ia_addr.sipx_addr.x_net,
  234                                                         *nbnet))
  235                                         goto skip_this;
  236 
  237                         /*
  238                          * Insert the net address of the dest net and
  239                          * calculate the new checksum if needed.
  240                          */
  241                         ifp = ia->ia_ifa.ifa_ifp;
  242                         dst.sipx_addr.x_net = ia->ia_addr.sipx_addr.x_net;
  243                         ipx->ipx_dna.x_net = dst.sipx_addr.x_net;
  244                         if(ipx->ipx_sum != 0xffff)
  245                                 ipx->ipx_sum = ipx_cksum(m, ntohs(ipx->ipx_len));
  246 
  247                         m1 = m_copym(m, 0, M_COPYALL, M_DONTWAIT);
  248                         if(m1) {
  249                                 error = (*ifp->if_output)(ifp, m1,
  250                                         (struct sockaddr *)&dst, NULL);
  251                                 /* XXX ipxstat.ipxs_localout++; */
  252                         }
  253 skip_this: ;
  254                 }
  255 
  256 bad:
  257         m_freem(m);
  258         return (error);
  259 }

Cache object: 55a33d9370e986febb60b42fed593469


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