sys/netproto/ipx/ipx_outputfl.c

   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: src/sys/netipx/ipx_outputfl.c,v 1.14.2.1 2000/05/01 01:10:24 bp Exp $
  37  * $DragonFly: src/sys/netproto/ipx/ipx_outputfl.c,v 1.6 2004/07/27 13:50:15 hmp Exp $
  38  */
  39
  40 #include <sys/param.h>
  41 #include <sys/systm.h>
  42 #include <sys/mbuf.h>
  43 #include <sys/socket.h>
  44
  45 #include <net/if.h>
  46 #include <net/route.h>
  47
  48 #include "ipx.h"
  49 #include "ipx_if.h"
  50 #include "ipx_var.h"
  51
  52 static int ipx_copy_output = 0;
  53
  54 int
  55 ipx_outputfl(m0, ro, flags)
  56         struct mbuf *m0;
  57         struct route *ro;
  58         int flags;
  59 {
  60         struct ipx *ipx = mtod(m0, struct ipx *);
  61         struct ifnet *ifp = NULL;
  62         int error = 0;
  63         struct sockaddr_ipx *dst;
  64         struct route ipxroute;
  65
  66         /*
  67          * Route packet.
  68          */
  69         if (ro == NULL) {
  70                 ro = &ipxroute;
  71                 bzero((caddr_t)ro, sizeof(*ro));
  72         }
  73         dst = (struct sockaddr_ipx *)&ro->ro_dst;
  74         if (ro->ro_rt == NULL) {
  75                 dst->sipx_family = AF_IPX;
  76                 dst->sipx_len = sizeof(*dst);
  77                 dst->sipx_addr = ipx->ipx_dna;
  78                 dst->sipx_addr.x_port = 0;
  79                 /*
  80                  * If routing to interface only,
  81                  * short circuit routing lookup.
  82                  */
  83                 if (flags & IPX_ROUTETOIF) {
  84                         struct ipx_ifaddr *ia = ipx_iaonnetof(&ipx->ipx_dna);
  85
  86                         if (ia == NULL) {
  87                                 ipxstat.ipxs_noroute++;
  88                                 error = ENETUNREACH;
  89                                 goto bad;
  90                         }
  91                         ifp = ia->ia_ifp;
  92                         goto gotif;
  93                 }
  94                 rtalloc(ro);
  95         } else if ((ro->ro_rt->rt_flags & RTF_UP) == 0) {
  96                 /*
  97                  * The old route has gone away; try for a new one.
  98                  */
  99                 rtfree(ro->ro_rt);
 100                 ro->ro_rt = NULL;
 101                 rtalloc(ro);
 102         }
 103         if (ro->ro_rt == NULL || (ifp = ro->ro_rt->rt_ifp) == NULL) {
 104                 ipxstat.ipxs_noroute++;
 105                 error = ENETUNREACH;
 106                 goto bad;
 107         }
 108         ro->ro_rt->rt_use++;
 109         if (ro->ro_rt->rt_flags & (RTF_GATEWAY|RTF_HOST))
 110                 dst = (struct sockaddr_ipx *)ro->ro_rt->rt_gateway;
 111 gotif:
 112         /*
 113          * Look for multicast addresses and
 114          * and verify user is allowed to send
 115          * such a packet.
 116          */
 117         if (dst->sipx_addr.x_host.c_host[0]&1) {
 118                 if ((ifp->if_flags & (IFF_BROADCAST | IFF_LOOPBACK)) == 0) {
 119                         error = EADDRNOTAVAIL;
 120                         goto bad;
 121                 }
 122                 if ((flags & IPX_ALLOWBROADCAST) == 0) {
 123                         error = EACCES;
 124                         goto bad;
 125                 }
 126                 m0->m_flags |= M_BCAST;
 127         }
 128
 129         if (htons(ipx->ipx_len) <= ifp->if_mtu) {
 130                 ipxstat.ipxs_localout++;
 131                 if (ipx_copy_output) {
 132                         ipx_watch_output(m0, ifp);
 133                 }
 134                 error = (*ifp->if_output)(ifp, m0,
 135                                         (struct sockaddr *)dst, ro->ro_rt);
 136                 goto done;
 137         } else {
 138                 ipxstat.ipxs_mtutoosmall++;
 139                 error = EMSGSIZE;
 140         }
 141 bad:
 142         if (ipx_copy_output) {
 143                 ipx_watch_output(m0, ifp);
 144         }
 145         m_freem(m0);
 146 done:
 147         if (ro == &ipxroute && (flags & IPX_ROUTETOIF) == 0 &&
 148             ro->ro_rt != NULL) {
 149                 RTFREE(ro->ro_rt);
 150                 ro->ro_rt = NULL;
 151         }
 152         return (error);
 153 }
 154
 155 /*
 156  * This will broadcast the type 20 (Netbios) packet to all the interfaces
 157  * that have ipx configured and isn't in the list yet.
 158  */
 159 int
 160 ipx_output_type20(m)
 161         struct mbuf *m;
 162 {
 163         struct ipx *ipx;
 164         union ipx_net *nbnet;
 165         struct ipx_ifaddr *ia, *tia = NULL;
 166         int error = 0;
 167         struct mbuf *m1;
 168         int i;
 169         struct ifnet *ifp;
 170         struct sockaddr_ipx dst;
 171
 172         /*
 173          * We have to get to the 32 bytes after the ipx header also, so
 174          * that we can fill in the network address of the receiving
 175          * interface.
 176          */
 177         if ((m->m_flags & M_EXT || m->m_len < (sizeof(struct ipx) + 32)) &&
 178             (m = m_pullup(m, sizeof(struct ipx) + 32)) == NULL) {
 179                 ipxstat.ipxs_toosmall++;
 180                 return (0);
 181         }
 182         ipx = mtod(m, struct ipx *);
 183         nbnet = (union ipx_net *)(ipx + 1);
 184
 185         if (ipx->ipx_tc >= 8)
 186                 goto bad;
 187         /*
 188          * Now see if we have already seen this.
 189          */
 190         for (ia = ipx_ifaddr; ia != NULL; ia = ia->ia_next)
 191                 if(ia->ia_ifa.ifa_ifp == m->m_pkthdr.rcvif) {
 192                         if(tia == NULL)
 193                                 tia = ia;
 194
 195                         for (i=0;i<ipx->ipx_tc;i++,nbnet++)
 196                                 if(ipx_neteqnn(ia->ia_addr.sipx_addr.x_net,
 197                                                         *nbnet))
 198                                         goto bad;
 199                 }
 200         /*
 201          * Don't route the packet if the interface where it come from
 202          * does not have an IPX address.
 203          */
 204         if(tia == NULL)
 205                 goto bad;
 206
 207         /*
 208          * Add our receiving interface to the list.
 209          */
 210         nbnet = (union ipx_net *)(ipx + 1);
 211         nbnet += ipx->ipx_tc;
 212         *nbnet = tia->ia_addr.sipx_addr.x_net;
 213
 214         /*
 215          * Increment the hop count.
 216          */
 217         ipx->ipx_tc++;
 218         ipxstat.ipxs_forward++;
 219
 220         /*
 221          * Send to all directly connected ifaces not in list and
 222          * not to the one it came from.
 223          */
 224         m->m_flags &= ~M_BCAST;
 225         bzero(&dst, sizeof(dst));
 226         dst.sipx_family = AF_IPX;
 227         dst.sipx_len = 12;
 228         dst.sipx_addr.x_host = ipx_broadhost;
 229
 230         for (ia = ipx_ifaddr; ia != NULL; ia = ia->ia_next)
 231                 if(ia->ia_ifa.ifa_ifp != m->m_pkthdr.rcvif) {
 232                         nbnet = (union ipx_net *)(ipx + 1);
 233                         for (i=0;i<ipx->ipx_tc;i++,nbnet++)
 234                                 if(ipx_neteqnn(ia->ia_addr.sipx_addr.x_net,
 235                                                         *nbnet))
 236                                         goto skip_this;
 237
 238                         /*
 239                          * Insert the net address of the dest net and
 240                          * calculate the new checksum if needed.
 241                          */
 242                         ifp = ia->ia_ifa.ifa_ifp;
 243                         dst.sipx_addr.x_net = ia->ia_addr.sipx_addr.x_net;
 244                         ipx->ipx_dna.x_net = dst.sipx_addr.x_net;
 245                         if(ipx->ipx_sum != 0xffff)
 246                                 ipx->ipx_sum = ipx_cksum(m, ntohs(ipx->ipx_len));
 247
 248                         m1 = m_copym(m, 0, M_COPYALL, MB_DONTWAIT);
 249                         if(m1) {
 250                                 error = (*ifp->if_output)(ifp, m1,
 251                                         (struct sockaddr *)&dst, NULL);
 252                                 /* XXX ipxstat.ipxs_localout++; */
 253                         }
 254 skip_this: ;
 255                 }
 256
 257 bad:
 258         m_freem(m);
 259         return (error);
 260 }