2 * Copyright (c) 2004-2005 Robert N. M. Watson
3 * Copyright (c) 1995, Mike Mitchell
4 * Copyright (c) 1984, 1985, 1986, 1987, 1993
5 * The Regents of the University of California. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by the University of
18 * California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
41 #include <sys/param.h>
42 #include <sys/systm.h>
44 #include <sys/protosw.h>
45 #include <sys/socket.h>
46 #include <sys/kernel.h>
47 #include <sys/random.h>
48 #include <sys/sysctl.h>
51 #include <net/route.h>
52 #include <net/netisr.h>
54 #include <netipx/ipx.h>
55 #include <netipx/spx.h>
56 #include <netipx/ipx_if.h>
57 #include <netipx/ipx_pcb.h>
58 #include <netipx/ipx_var.h>
61 SYSCTL_INT(_net_ipx_ipx, OID_AUTO, checksum, CTLFLAG_RW,
64 static int ipxprintfs = 0; /* printing forwarding information */
65 SYSCTL_INT(_net_ipx_ipx, OID_AUTO, ipxprintfs, CTLFLAG_RW,
68 static int ipxforwarding = 0;
69 SYSCTL_INT(_net_ipx_ipx, OID_AUTO, ipxforwarding, CTLFLAG_RW,
70 &ipxforwarding, 0, "");
72 static int ipxnetbios = 0;
73 SYSCTL_INT(_net_ipx, OID_AUTO, ipxnetbios, CTLFLAG_RW,
76 const union ipx_net ipx_zeronet;
77 const union ipx_host ipx_zerohost;
79 const union ipx_net ipx_broadnet = { .s_net[0] = 0xffff,
81 const union ipx_host ipx_broadhost = { .s_host[0] = 0xffff,
83 .s_host[2] = 0xffff };
85 struct ipxstat ipxstat;
86 struct sockaddr_ipx ipx_netmask, ipx_hostmask;
89 * IPX protocol control block (pcb) lists.
91 struct mtx ipxpcb_list_mtx;
92 struct ipxpcbhead ipxpcb_list;
93 struct ipxpcbhead ipxrawpcb_list;
95 static int ipxqmaxlen = IFQ_MAXLEN;
96 static struct ifqueue ipxintrq;
98 long ipx_pexseq; /* Locked with ipxpcb_list_mtx. */
100 static int ipx_do_route(struct ipx_addr *src, struct route *ro);
101 static void ipx_undo_route(struct route *ro);
102 static void ipx_forward(struct mbuf *m);
103 static void ipxintr(struct mbuf *m);
106 * IPX initialization.
113 read_random(&ipx_pexseq, sizeof ipx_pexseq);
115 LIST_INIT(&ipxpcb_list);
116 LIST_INIT(&ipxrawpcb_list);
118 IPX_LIST_LOCK_INIT();
120 ipx_netmask.sipx_len = 6;
121 ipx_netmask.sipx_addr.x_net = ipx_broadnet;
123 ipx_hostmask.sipx_len = 12;
124 ipx_hostmask.sipx_addr.x_net = ipx_broadnet;
125 ipx_hostmask.sipx_addr.x_host = ipx_broadhost;
127 ipxintrq.ifq_maxlen = ipxqmaxlen;
128 mtx_init(&ipxintrq.ifq_mtx, "ipx_inq", NULL, MTX_DEF);
129 netisr_register(NETISR_IPX, ipxintr, &ipxintrq, NETISR_MPSAFE);
133 * IPX input routine. Pass to next level.
136 ipxintr(struct mbuf *m)
138 register struct ipx *ipx;
139 register struct ipxpcb *ipxp;
140 struct ipx_ifaddr *ia;
144 * If no IPX addresses have been set yet but the interfaces
145 * are receiving, can't do anything with incoming packets yet.
147 if (ipx_ifaddr == NULL) {
152 ipxstat.ipxs_total++;
154 if ((m->m_flags & M_EXT || m->m_len < sizeof(struct ipx)) &&
155 (m = m_pullup(m, sizeof(struct ipx))) == NULL) {
156 ipxstat.ipxs_toosmall++;
161 * Give any raw listeners a crack at the packet
164 LIST_FOREACH(ipxp, &ipxrawpcb_list, ipxp_list) {
165 struct mbuf *m1 = m_copy(m, 0, (int)M_COPYALL);
174 ipx = mtod(m, struct ipx *);
175 len = ntohs(ipx->ipx_len);
177 * Check that the amount of data in the buffers
178 * is as at least much as the IPX header would have us expect.
179 * Trim mbufs if longer than we expect.
180 * Drop packet if shorter than we expect.
182 if (m->m_pkthdr.len < len) {
183 ipxstat.ipxs_tooshort++;
187 if (m->m_pkthdr.len > len) {
188 if (m->m_len == m->m_pkthdr.len) {
190 m->m_pkthdr.len = len;
192 m_adj(m, len - m->m_pkthdr.len);
194 if (ipxcksum && ipx->ipx_sum != 0xffff) {
195 if (ipx->ipx_sum != ipx_cksum(m, len)) {
196 ipxstat.ipxs_badsum++;
203 * Propagated (Netbios) packets (type 20) has to be handled
206 if (ipx->ipx_pt == IPXPROTO_NETBIOS) {
208 ipx_output_type20(m);
217 * Is this a directed broadcast?
219 if (ipx_hosteqnh(ipx_broadhost,ipx->ipx_dna.x_host)) {
220 if ((!ipx_neteq(ipx->ipx_dna, ipx->ipx_sna)) &&
221 (!ipx_neteqnn(ipx->ipx_dna.x_net, ipx_broadnet)) &&
222 (!ipx_neteqnn(ipx->ipx_sna.x_net, ipx_zeronet)) &&
223 (!ipx_neteqnn(ipx->ipx_dna.x_net, ipx_zeronet)) ) {
225 * If it is a broadcast to the net where it was
226 * received from, treat it as ours.
228 for (ia = ipx_ifaddr; ia != NULL; ia = ia->ia_next)
229 if((ia->ia_ifa.ifa_ifp == m->m_pkthdr.rcvif) &&
230 ipx_neteq(ia->ia_addr.sipx_addr,
235 * Look to see if I need to eat this packet.
236 * Algorithm is to forward all young packets
237 * and prematurely age any packets which will
238 * by physically broadcasted.
239 * Any very old packets eaten without forwarding
242 * Suggestion of Bill Nesheim, Cornell U.
244 if (ipx->ipx_tc < IPX_MAXHOPS) {
250 * Is this our packet? If not, forward.
253 for (ia = ipx_ifaddr; ia != NULL; ia = ia->ia_next)
254 if (ipx_hosteq(ipx->ipx_dna, ia->ia_addr.sipx_addr) &&
255 (ipx_neteq(ipx->ipx_dna, ia->ia_addr.sipx_addr) ||
256 ipx_neteqnn(ipx->ipx_dna.x_net, ipx_zeronet)))
266 * Locate pcb for datagram.
269 ipxp = ipx_pcblookup(&ipx->ipx_sna, ipx->ipx_dna.x_port, IPX_WILDCARD);
271 * Switch out to protocol's input routine.
274 ipxstat.ipxs_delivered++;
275 if ((ipxp->ipxp_flags & IPXP_ALL_PACKETS) == 0)
276 switch (ipx->ipx_pt) {
279 /* Will release both locks. */
292 ipx_ctlinput(cmd, arg_as_sa, dummy)
294 struct sockaddr *arg_as_sa; /* XXX should be swapped with dummy */
297 caddr_t arg = (/* XXX */ caddr_t)arg_as_sa;
298 struct ipx_addr *ipx;
300 if (cmd < 0 || cmd >= PRC_NCMDS)
303 struct sockaddr_ipx *sipx;
307 case PRC_HOSTUNREACH:
308 sipx = (struct sockaddr_ipx *)arg;
309 if (sipx->sipx_family != AF_IPX)
311 ipx = &sipx->sipx_addr;
316 printf("ipx_ctlinput: cmd %d.\n", cmd);
322 * Forward a packet. If some error occurs drop the packet. IPX don't
323 * have a way to return errors to the sender.
326 static struct route ipx_droute;
327 static struct route ipx_sroute;
333 register struct ipx *ipx = mtod(m, struct ipx *);
336 int flags = IPX_FORWARDING;
340 if (ipxforwarding == 0) {
341 /* can't tell difference between net and host */
342 ipxstat.ipxs_cantforward++;
347 if (ipx->ipx_tc > IPX_MAXHOPS) {
348 ipxstat.ipxs_cantforward++;
353 if ((ok_there = ipx_do_route(&ipx->ipx_dna,&ipx_droute)) == 0) {
354 ipxstat.ipxs_noroute++;
359 * Here we think about forwarding broadcast packets,
360 * so we try to insure that it doesn't go back out
361 * on the interface it came in on. Also, if we
362 * are going to physically broadcast this, let us
363 * age the packet so we can eat it safely the second time around.
365 if (ipx->ipx_dna.x_host.c_host[0] & 0x1) {
366 struct ipx_ifaddr *ia = ipx_iaonnetof(&ipx->ipx_dna);
369 /* I'm gonna hafta eat this packet */
370 agedelta += IPX_MAXHOPS - ipx->ipx_tc;
371 ipx->ipx_tc = IPX_MAXHOPS;
373 if ((ok_back = ipx_do_route(&ipx->ipx_sna,&ipx_sroute)) == 0) {
374 /* error = ENETUNREACH; He'll never get it! */
375 ipxstat.ipxs_noroute++;
379 if (ipx_droute.ro_rt &&
380 (ifp = ipx_droute.ro_rt->rt_ifp) &&
382 (ifp != ipx_sroute.ro_rt->rt_ifp)) {
383 flags |= IPX_ALLOWBROADCAST;
385 ipxstat.ipxs_noroute++;
391 * We don't need to recompute checksum because ipx_tc field
392 * is ignored by checksum calculation routine, however
393 * it may be desirable to reset checksum if ipxcksum == 0
397 ipx->ipx_sum = 0xffff;
400 error = ipx_outputfl(m, &ipx_droute, flags);
402 ipxstat.ipxs_forward++;
406 ipx_printhost(&ipx->ipx_sna);
408 ipx_printhost(&ipx->ipx_dna);
409 printf(" hops %d\n", ipx->ipx_tc);
414 ipx_undo_route(&ipx_droute);
416 ipx_undo_route(&ipx_sroute);
420 ipx_do_route(src, ro)
421 struct ipx_addr *src;
424 struct sockaddr_ipx *dst;
426 bzero((caddr_t)ro, sizeof(*ro));
427 dst = (struct sockaddr_ipx *)&ro->ro_dst;
429 dst->sipx_len = sizeof(*dst);
430 dst->sipx_family = AF_IPX;
431 dst->sipx_addr = *src;
432 dst->sipx_addr.x_port = 0;
434 if (ro->ro_rt == NULL || ro->ro_rt->rt_ifp == NULL) {
443 register struct route *ro;
445 if (ro->ro_rt != NULL) {
451 ipx_watch_output(m, ifp)
455 register struct ipxpcb *ipxp;
456 register struct ifaddr *ifa;
457 register struct ipx_ifaddr *ia;
459 * Give any raw listeners a crack at the packet
462 LIST_FOREACH(ipxp, &ipxrawpcb_list, ipxp_list) {
463 struct mbuf *m0 = m_copy(m, 0, (int)M_COPYALL);
465 register struct ipx *ipx;
467 M_PREPEND(m0, sizeof(*ipx), M_DONTWAIT);
470 ipx = mtod(m0, struct ipx *);
471 ipx->ipx_sna.x_net = ipx_zeronet;
472 for (ia = ipx_ifaddr; ia != NULL; ia = ia->ia_next)
473 if (ifp == ia->ia_ifp)
476 ipx->ipx_sna.x_host = ipx_zerohost;
478 ipx->ipx_sna.x_host =
479 ia->ia_addr.sipx_addr.x_host;
481 if (ifp != NULL && (ifp->if_flags & IFF_POINTOPOINT))
482 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
483 if (ifa->ifa_addr->sa_family == AF_IPX) {
484 ipx->ipx_sna = IA_SIPX(ifa)->sipx_addr;
488 ipx->ipx_len = ntohl(m0->m_pkthdr.len);