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
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD$");
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 <netipx/ipx.h>
49 #include <netipx/ipx_if.h>
50 #include <netipx/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 register struct ipx *ipx = mtod(m0, struct ipx *);
61 register 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_ign(ro, 0);
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_ign(ro, 0);
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 register 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, M_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 }
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