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 1.8 2006/01/14 13:36:40 swildner 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(struct mbuf *m0, struct route *ro, int flags)
  56 {
  57         struct ipx *ipx = mtod(m0, struct ipx *);
  58         struct ifnet *ifp = NULL;
  59         int error = 0;
  60         struct sockaddr_ipx *dst;
  61         struct route ipxroute;
  62
  63         /*
  64          * Route packet.
  65          */
  66         if (ro == NULL) {
  67                 ro = &ipxroute;
  68                 bzero((caddr_t)ro, sizeof(*ro));
  69         }
  70         dst = (struct sockaddr_ipx *)&ro->ro_dst;
  71         if (ro->ro_rt == NULL) {
  72                 dst->sipx_family = AF_IPX;
  73                 dst->sipx_len = sizeof(*dst);
  74                 dst->sipx_addr = ipx->ipx_dna;
  75                 dst->sipx_addr.x_port = 0;
  76                 /*
  77                  * If routing to interface only,
  78                  * short circuit routing lookup.
  79                  */
  80                 if (flags & IPX_ROUTETOIF) {
  81                         struct ipx_ifaddr *ia = ipx_iaonnetof(&ipx->ipx_dna);
  82
  83                         if (ia == NULL) {
  84                                 ipxstat.ipxs_noroute++;
  85                                 error = ENETUNREACH;
  86                                 goto bad;
  87                         }
  88                         ifp = ia->ia_ifp;
  89                         goto gotif;
  90                 }
  91                 rtalloc(ro);
  92         } else if ((ro->ro_rt->rt_flags & RTF_UP) == 0) {
  93                 /*
  94                  * The old route has gone away; try for a new one.
  95                  */
  96                 rtfree(ro->ro_rt);
  97                 ro->ro_rt = NULL;
  98                 rtalloc(ro);
  99         }
 100         if (ro->ro_rt == NULL || (ifp = ro->ro_rt->rt_ifp) == NULL) {
 101                 ipxstat.ipxs_noroute++;
 102                 error = ENETUNREACH;
 103                 goto bad;
 104         }
 105         ro->ro_rt->rt_use++;
 106         if (ro->ro_rt->rt_flags & (RTF_GATEWAY|RTF_HOST))
 107                 dst = (struct sockaddr_ipx *)ro->ro_rt->rt_gateway;
 108 gotif:
 109         /*
 110          * Look for multicast addresses and
 111          * and verify user is allowed to send
 112          * such a packet.
 113          */
 114         if (dst->sipx_addr.x_host.c_host[0]&1) {
 115                 if ((ifp->if_flags & (IFF_BROADCAST | IFF_LOOPBACK)) == 0) {
 116                         error = EADDRNOTAVAIL;
 117                         goto bad;
 118                 }
 119                 if ((flags & IPX_ALLOWBROADCAST) == 0) {
 120                         error = EACCES;
 121                         goto bad;
 122                 }
 123                 m0->m_flags |= M_BCAST;
 124         }
 125
 126         if (htons(ipx->ipx_len) <= ifp->if_mtu) {
 127                 ipxstat.ipxs_localout++;
 128                 if (ipx_copy_output) {
 129                         ipx_watch_output(m0, ifp);
 130                 }
 131                 lwkt_serialize_enter(ifp->if_serializer);
 132                 error = (*ifp->if_output)(ifp, m0,
 133                                         (struct sockaddr *)dst, ro->ro_rt);
 134                 lwkt_serialize_exit(ifp->if_serializer);
 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(struct mbuf *m)
 160 {
 161         struct ipx *ipx;
 162         union ipx_net *nbnet;
 163         struct ipx_ifaddr *ia, *tia = NULL;
 164         int error = 0;
 165         struct mbuf *m1;
 166         int i;
 167         struct ifnet *ifp;
 168         struct sockaddr_ipx dst;
 169
 170         /*
 171          * We have to get to the 32 bytes after the ipx header also, so
 172          * that we can fill in the network address of the receiving
 173          * interface.
 174          */
 175         if ((m->m_flags & M_EXT || m->m_len < (sizeof(struct ipx) + 32)) &&
 176             (m = m_pullup(m, sizeof(struct ipx) + 32)) == NULL) {
 177                 ipxstat.ipxs_toosmall++;
 178                 return (0);
 179         }
 180         ipx = mtod(m, struct ipx *);
 181         nbnet = (union ipx_net *)(ipx + 1);
 182
 183         if (ipx->ipx_tc >= 8)
 184                 goto bad;
 185         /*
 186          * Now see if we have already seen this.
 187          */
 188         for (ia = ipx_ifaddr; ia != NULL; ia = ia->ia_next)
 189                 if(ia->ia_ifa.ifa_ifp == m->m_pkthdr.rcvif) {
 190                         if(tia == NULL)
 191                                 tia = ia;
 192
 193                         for (i=0;i<ipx->ipx_tc;i++,nbnet++)
 194                                 if(ipx_neteqnn(ia->ia_addr.sipx_addr.x_net,
 195                                                         *nbnet))
 196                                         goto bad;
 197                 }
 198         /*
 199          * Don't route the packet if the interface where it come from
 200          * does not have an IPX address.
 201          */
 202         if(tia == NULL)
 203                 goto bad;
 204
 205         /*
 206          * Add our receiving interface to the list.
 207          */
 208         nbnet = (union ipx_net *)(ipx + 1);
 209         nbnet += ipx->ipx_tc;
 210         *nbnet = tia->ia_addr.sipx_addr.x_net;
 211
 212         /*
 213          * Increment the hop count.
 214          */
 215         ipx->ipx_tc++;
 216         ipxstat.ipxs_forward++;
 217
 218         /*
 219          * Send to all directly connected ifaces not in list and
 220          * not to the one it came from.
 221          */
 222         m->m_flags &= ~M_BCAST;
 223         bzero(&dst, sizeof(dst));
 224         dst.sipx_family = AF_IPX;
 225         dst.sipx_len = 12;
 226         dst.sipx_addr.x_host = ipx_broadhost;
 227
 228         for (ia = ipx_ifaddr; ia != NULL; ia = ia->ia_next)
 229                 if(ia->ia_ifa.ifa_ifp != m->m_pkthdr.rcvif) {
 230                         nbnet = (union ipx_net *)(ipx + 1);
 231                         for (i=0;i<ipx->ipx_tc;i++,nbnet++)
 232                                 if(ipx_neteqnn(ia->ia_addr.sipx_addr.x_net,
 233                                                         *nbnet))
 234                                         goto skip_this;
 235
 236                         /*
 237                          * Insert the net address of the dest net and
 238                          * calculate the new checksum if needed.
 239                          */
 240                         ifp = ia->ia_ifa.ifa_ifp;
 241                         dst.sipx_addr.x_net = ia->ia_addr.sipx_addr.x_net;
 242                         ipx->ipx_dna.x_net = dst.sipx_addr.x_net;
 243                         if(ipx->ipx_sum != 0xffff)
 244                                 ipx->ipx_sum = ipx_cksum(m, ntohs(ipx->ipx_len));
 245
 246                         m1 = m_copym(m, 0, M_COPYALL, MB_DONTWAIT);
 247                         if(m1) {
 248                                 lwkt_serialize_enter(ifp->if_serializer);
 249                                 error = (*ifp->if_output)(ifp, m1,
 250                                         (struct sockaddr *)&dst, NULL);
 251                                 lwkt_serialize_exit(ifp->if_serializer);
 252                                 /* XXX ipxstat.ipxs_localout++; */
 253                         }
 254 skip_this: ;
 255                 }
 256
 257 bad:
 258         m_freem(m);
 259         return (error);
 260 }