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.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
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.
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
36 * $FreeBSD: src/sys/netipx/ipx_input.c,v 1.22.2.2 2001/02/22 09:44:18 bp Exp $
37 * $DragonFly: src/sys/netproto/ipx/ipx_input.c,v 1.16 2007/05/23 08:57:08 dillon Exp $
40 #include <sys/param.h>
41 #include <sys/systm.h>
43 #include <sys/protosw.h>
44 #include <sys/socket.h>
45 #include <sys/kernel.h>
46 #include <sys/random.h>
47 #include <sys/sysctl.h>
49 #include <sys/thread2.h>
50 #include <sys/msgport2.h>
53 #include <net/route.h>
54 #include <net/netisr.h>
55 #include <net/intrq.h>
64 SYSCTL_INT(_net_ipx_ipx
, OID_AUTO
, checksum
, CTLFLAG_RW
,
67 static int ipxprintfs
= 0; /* printing forwarding information */
68 SYSCTL_INT(_net_ipx_ipx
, OID_AUTO
, ipxprintfs
, CTLFLAG_RW
,
71 static int ipxforwarding
= 0;
72 SYSCTL_INT(_net_ipx_ipx
, OID_AUTO
, ipxforwarding
, CTLFLAG_RW
,
73 &ipxforwarding
, 0, "");
75 static int ipxnetbios
= 0;
76 SYSCTL_INT(_net_ipx
, OID_AUTO
, ipxnetbios
, CTLFLAG_RW
,
79 union ipx_net ipx_zeronet
;
80 union ipx_host ipx_zerohost
;
82 union ipx_net ipx_broadnet
;
83 union ipx_host ipx_broadhost
;
85 struct ipxstat ipxstat
;
86 struct sockaddr_ipx ipx_netmask
, ipx_hostmask
;
88 static u_short allones
[] = {-1, -1, -1};
91 struct ipxpcb ipxrawpcb
;
95 static void ipxintr(struct netmsg
*);
96 static int ipx_do_route(struct ipx_addr
*src
, struct route
*ro
);
97 static void ipx_undo_route(struct route
*ro
);
98 static void ipx_forward(struct mbuf
*m
);
101 * IPX initialization.
107 ipx_broadnet
= *(union ipx_net
*)allones
;
108 ipx_broadhost
= *(union ipx_host
*)allones
;
110 read_random(&ipx_pexseq
, sizeof ipx_pexseq
);
111 ipxpcb
.ipxp_next
= ipxpcb
.ipxp_prev
= &ipxpcb
;
112 ipxrawpcb
.ipxp_next
= ipxrawpcb
.ipxp_prev
= &ipxrawpcb
;
114 ipx_netmask
.sipx_len
= 6;
115 ipx_netmask
.sipx_addr
.x_net
= ipx_broadnet
;
117 ipx_hostmask
.sipx_len
= 12;
118 ipx_hostmask
.sipx_addr
.x_net
= ipx_broadnet
;
119 ipx_hostmask
.sipx_addr
.x_host
= ipx_broadhost
;
121 netisr_register(NETISR_IPX
, cpu0_portfn
, ipxintr
);
125 * IPX input routine. Pass to next level.
128 ipxintr(struct netmsg
*msg
)
130 struct mbuf
*m
= ((struct netmsg_packet
*)msg
)->nm_packet
;
133 struct ipx_ifaddr
*ia
;
137 * If no IPX addresses have been set yet but the interfaces
138 * are receiving, can't do anything with incoming packets yet.
140 if (ipx_ifaddr
== NULL
)
143 ipxstat
.ipxs_total
++;
145 if ((m
->m_flags
& M_EXT
|| m
->m_len
< sizeof(struct ipx
)) &&
146 (m
= m_pullup(m
, sizeof(struct ipx
))) == 0) {
147 ipxstat
.ipxs_toosmall
++;
152 * Give any raw listeners a crack at the packet
154 for (ipxp
= ipxrawpcb
.ipxp_next
; ipxp
!= &ipxrawpcb
;
155 ipxp
= ipxp
->ipxp_next
) {
156 struct mbuf
*m1
= m_copy(m
, 0, (int)M_COPYALL
);
161 ipx
= mtod(m
, struct ipx
*);
162 len
= ntohs(ipx
->ipx_len
);
164 * Check that the amount of data in the buffers
165 * is as at least much as the IPX header would have us expect.
166 * Trim mbufs if longer than we expect.
167 * Drop packet if shorter than we expect.
169 if (m
->m_pkthdr
.len
< len
) {
170 ipxstat
.ipxs_tooshort
++;
173 if (m
->m_pkthdr
.len
> len
) {
174 if (m
->m_len
== m
->m_pkthdr
.len
) {
176 m
->m_pkthdr
.len
= len
;
178 m_adj(m
, len
- m
->m_pkthdr
.len
);
180 if (ipxcksum
&& ipx
->ipx_sum
!= 0xffff) {
181 if (ipx
->ipx_sum
!= ipx_cksum(m
, len
)) {
182 ipxstat
.ipxs_badsum
++;
188 * Propagated (Netbios) packets (type 20) has to be handled
191 if (ipx
->ipx_pt
== IPXPROTO_NETBIOS
) {
193 ipx_output_type20(m
);
200 * Is this a directed broadcast?
202 if (ipx_hosteqnh(ipx_broadhost
,ipx
->ipx_dna
.x_host
)) {
203 if ((!ipx_neteq(ipx
->ipx_dna
, ipx
->ipx_sna
)) &&
204 (!ipx_neteqnn(ipx
->ipx_dna
.x_net
, ipx_broadnet
)) &&
205 (!ipx_neteqnn(ipx
->ipx_sna
.x_net
, ipx_zeronet
)) &&
206 (!ipx_neteqnn(ipx
->ipx_dna
.x_net
, ipx_zeronet
)) ) {
208 * If it is a broadcast to the net where it was
209 * received from, treat it as ours.
211 for (ia
= ipx_ifaddr
; ia
!= NULL
; ia
= ia
->ia_next
)
212 if((ia
->ia_ifa
.ifa_ifp
== m
->m_pkthdr
.rcvif
) &&
213 ipx_neteq(ia
->ia_addr
.sipx_addr
,
218 * Look to see if I need to eat this packet.
219 * Algorithm is to forward all young packets
220 * and prematurely age any packets which will
221 * by physically broadcasted.
222 * Any very old packets eaten without forwarding
225 * Suggestion of Bill Nesheim, Cornell U.
227 if (ipx
->ipx_tc
< IPX_MAXHOPS
) {
233 * Is this our packet? If not, forward.
236 for (ia
= ipx_ifaddr
; ia
!= NULL
; ia
= ia
->ia_next
)
237 if (ipx_hosteq(ipx
->ipx_dna
, ia
->ia_addr
.sipx_addr
) &&
238 (ipx_neteq(ipx
->ipx_dna
, ia
->ia_addr
.sipx_addr
) ||
239 ipx_neteqnn(ipx
->ipx_dna
.x_net
, ipx_zeronet
)))
249 * Locate pcb for datagram.
251 ipxp
= ipx_pcblookup(&ipx
->ipx_sna
, ipx
->ipx_dna
.x_port
, IPX_WILDCARD
);
253 * Switch out to protocol's input routine.
256 ipxstat
.ipxs_delivered
++;
257 if ((ipxp
->ipxp_flags
& IPXP_ALL_PACKETS
) == 0)
258 switch (ipx
->ipx_pt
) {
273 /* msg was embedded in the mbuf, do not reply! */
278 * arg_as_sa: XXX should be swapped with dummy
281 ipx_ctlinput(int cmd
, struct sockaddr
*arg_as_sa
, void *dummy
)
283 caddr_t arg
= (/* XXX */ caddr_t
)arg_as_sa
;
284 struct ipx_addr
*ipx
;
286 if (cmd
< 0 || cmd
> PRC_NCMDS
)
289 struct sockaddr_ipx
*sipx
;
293 case PRC_HOSTUNREACH
:
294 sipx
= (struct sockaddr_ipx
*)arg
;
295 if (sipx
->sipx_family
!= AF_IPX
)
297 ipx
= &sipx
->sipx_addr
;
302 kprintf("ipx_ctlinput: cmd %d.\n", cmd
);
308 * Forward a packet. If some error occurs drop the packet. IPX don't
309 * have a way to return errors to the sender.
312 static struct route ipx_droute
;
313 static struct route ipx_sroute
;
316 ipx_forward(struct mbuf
*m
)
318 struct ipx
*ipx
= mtod(m
, struct ipx
*);
320 struct mbuf
*mcopy
= NULL
;
322 int flags
= IPX_FORWARDING
;
326 if (ipxforwarding
== 0) {
327 /* can't tell difference between net and host */
328 ipxstat
.ipxs_cantforward
++;
333 if (ipx
->ipx_tc
> IPX_MAXHOPS
) {
334 ipxstat
.ipxs_cantforward
++;
339 if ((ok_there
= ipx_do_route(&ipx
->ipx_dna
,&ipx_droute
)) == 0) {
340 ipxstat
.ipxs_noroute
++;
345 * Here we think about forwarding broadcast packets,
346 * so we try to insure that it doesn't go back out
347 * on the interface it came in on. Also, if we
348 * are going to physically broadcast this, let us
349 * age the packet so we can eat it safely the second time around.
351 if (ipx
->ipx_dna
.x_host
.c_host
[0] & 0x1) {
352 struct ipx_ifaddr
*ia
= ipx_iaonnetof(&ipx
->ipx_dna
);
355 /* I'm gonna hafta eat this packet */
356 agedelta
+= IPX_MAXHOPS
- ipx
->ipx_tc
;
357 ipx
->ipx_tc
= IPX_MAXHOPS
;
359 if ((ok_back
= ipx_do_route(&ipx
->ipx_sna
,&ipx_sroute
)) == 0) {
360 /* error = ENETUNREACH; He'll never get it! */
361 ipxstat
.ipxs_noroute
++;
365 if (ipx_droute
.ro_rt
&&
366 (ifp
= ipx_droute
.ro_rt
->rt_ifp
) &&
368 (ifp
!= ipx_sroute
.ro_rt
->rt_ifp
)) {
369 flags
|= IPX_ALLOWBROADCAST
;
371 ipxstat
.ipxs_noroute
++;
377 * We don't need to recompute checksum because ipx_tc field
378 * is ignored by checksum calculation routine, however
379 * it may be desirable to reset checksum if ipxcksum == 0
383 ipx
->ipx_sum
= 0xffff;
386 error
= ipx_outputfl(m
, &ipx_droute
, flags
);
388 ipxstat
.ipxs_forward
++;
391 kprintf("forward: ");
392 ipx_printhost(&ipx
->ipx_sna
);
394 ipx_printhost(&ipx
->ipx_dna
);
395 kprintf(" hops %d\n", ipx
->ipx_tc
);
397 } else if (mcopy
!= NULL
) {
398 ipx
= mtod(mcopy
, struct ipx
*);
406 ipxstat
.ipxs_noroute
++;
410 ipxstat
.ipxs_mtutoosmall
++;
414 ipxstat
.ipxs_odropped
++;
422 ipx_undo_route(&ipx_droute
);
424 ipx_undo_route(&ipx_sroute
);
430 ipx_do_route(struct ipx_addr
*src
, struct route
*ro
)
432 struct sockaddr_ipx
*dst
;
434 bzero((caddr_t
)ro
, sizeof(*ro
));
435 dst
= (struct sockaddr_ipx
*)&ro
->ro_dst
;
437 dst
->sipx_len
= sizeof(*dst
);
438 dst
->sipx_family
= AF_IPX
;
439 dst
->sipx_addr
= *src
;
440 dst
->sipx_addr
.x_port
= 0;
442 if (ro
->ro_rt
== NULL
|| ro
->ro_rt
->rt_ifp
== NULL
) {
450 ipx_undo_route(struct route
*ro
)
452 if (ro
->ro_rt
!= NULL
) {
458 ipx_watch_output(struct mbuf
*m
, struct ifnet
*ifp
)
462 struct ipx_ifaddr
*ia
;
464 * Give any raw listeners a crack at the packet
466 for (ipxp
= ipxrawpcb
.ipxp_next
; ipxp
!= &ipxrawpcb
;
467 ipxp
= ipxp
->ipxp_next
) {
468 struct mbuf
*m0
= m_copy(m
, 0, (int)M_COPYALL
);
472 M_PREPEND(m0
, sizeof(*ipx
), MB_DONTWAIT
);
475 ipx
= mtod(m0
, struct ipx
*);
476 ipx
->ipx_sna
.x_net
= ipx_zeronet
;
477 for (ia
= ipx_ifaddr
; ia
!= NULL
; ia
= ia
->ia_next
)
478 if (ifp
== ia
->ia_ifp
)
481 ipx
->ipx_sna
.x_host
= ipx_zerohost
;
483 ipx
->ipx_sna
.x_host
=
484 ia
->ia_addr
.sipx_addr
.x_host
;
486 if (ifp
!= NULL
&& (ifp
->if_flags
& IFF_POINTOPOINT
))
487 TAILQ_FOREACH(ifa
, &ifp
->if_addrhead
, ifa_link
) {
488 if (ifa
->ifa_addr
->sa_family
== AF_IPX
) {
489 ipx
->ipx_sna
= IA_SIPX(ifa
)->sipx_addr
;
493 ipx
->ipx_len
= ntohl(m0
->m_pkthdr
.len
);