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 $
39 #include <sys/param.h>
40 #include <sys/systm.h>
42 #include <sys/protosw.h>
43 #include <sys/socket.h>
44 #include <sys/kernel.h>
45 #include <sys/random.h>
46 #include <sys/sysctl.h>
48 #include <sys/thread2.h>
49 #include <sys/msgport2.h>
50 #include <sys/mplock2.h>
53 #include <net/route.h>
54 #include <net/netisr.h>
63 SYSCTL_INT(_net_ipx_ipx
, OID_AUTO
, checksum
, CTLFLAG_RW
,
66 static int ipxprintfs
= 0; /* printing forwarding information */
67 SYSCTL_INT(_net_ipx_ipx
, OID_AUTO
, ipxprintfs
, CTLFLAG_RW
,
70 static int ipxforwarding
= 0;
71 SYSCTL_INT(_net_ipx_ipx
, OID_AUTO
, ipxforwarding
, CTLFLAG_RW
,
72 &ipxforwarding
, 0, "");
74 static int ipxnetbios
= 0;
75 SYSCTL_INT(_net_ipx
, OID_AUTO
, ipxnetbios
, CTLFLAG_RW
,
78 union ipx_net ipx_zeronet
;
79 union ipx_host ipx_zerohost
;
81 union ipx_net ipx_broadnet
;
82 union ipx_host ipx_broadhost
;
84 struct ipxstat ipxstat
;
85 struct sockaddr_ipx ipx_netmask
, ipx_hostmask
;
87 static u_short allones
[] = {-1, -1, -1};
89 struct ipxpcbhead ipxpcb_list
;
90 struct ipxpcbhead ipxrawpcb_list
;
94 static void ipxintr(netmsg_t msg
);
95 static int ipx_do_route(struct ipx_addr
*src
, struct route
*ro
);
96 static void ipx_undo_route(struct route
*ro
);
97 static void ipx_forward(struct mbuf
*m
);
100 * IPX initialization.
106 ipx_broadnet
= *(union ipx_net
*)allones
;
107 ipx_broadhost
= *(union ipx_host
*)allones
;
109 read_random(&ipx_pexseq
, sizeof ipx_pexseq
);
110 LIST_INIT(&ipxpcb_list
);
111 LIST_INIT(&ipxrawpcb_list
);
113 ipx_netmask
.sipx_len
= 6;
114 ipx_netmask
.sipx_addr
.x_net
= ipx_broadnet
;
116 ipx_hostmask
.sipx_len
= 12;
117 ipx_hostmask
.sipx_addr
.x_net
= ipx_broadnet
;
118 ipx_hostmask
.sipx_addr
.x_host
= ipx_broadhost
;
120 netisr_register(NETISR_IPX
, ipxintr
, NULL
);
124 * IPX input routine. Pass to next level.
127 ipxintr(netmsg_t msg
)
129 struct mbuf
*m
= msg
->packet
.nm_packet
;
132 struct ipx_ifaddr
*ia
;
138 * If no IPX addresses have been set yet but the interfaces
139 * are receiving, can't do anything with incoming packets yet.
141 if (ipx_ifaddr
== NULL
)
144 ipxstat
.ipxs_total
++;
146 if ((m
->m_flags
& M_EXT
|| m
->m_len
< sizeof(struct ipx
)) &&
147 (m
= m_pullup(m
, sizeof(struct ipx
))) == NULL
) {
148 ipxstat
.ipxs_toosmall
++;
153 * Give any raw listeners a crack at the packet
155 LIST_FOREACH(ipxp
, &ipxrawpcb_list
, ipxp_list
) {
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(netmsg_t msg
)
283 int cmd
= msg
->ctlinput
.nm_cmd
;
284 struct sockaddr
*arg_as_sa
= msg
->ctlinput
.nm_arg
;
285 caddr_t arg
= (/* XXX */ caddr_t
)arg_as_sa
;
286 struct sockaddr_ipx
*sipx
;
288 if (cmd
< 0 || cmd
> PRC_NCMDS
)
294 case PRC_HOSTUNREACH
:
295 sipx
= (struct sockaddr_ipx
*)arg
;
296 if (sipx
->sipx_family
!= AF_IPX
)
302 kprintf("ipx_ctlinput: cmd %d.\n", cmd
);
306 lwkt_replymsg(&msg
->lmsg
, 0);
310 * Forward a packet. If some error occurs drop the packet. IPX don't
311 * have a way to return errors to the sender.
314 static struct route ipx_droute
;
315 static struct route ipx_sroute
;
318 ipx_forward(struct mbuf
*m
)
320 struct ipx
*ipx
= mtod(m
, struct ipx
*);
322 struct mbuf
*mcopy
= NULL
;
324 int flags
= IPX_FORWARDING
;
328 if (ipxforwarding
== 0) {
329 /* can't tell difference between net and host */
330 ipxstat
.ipxs_cantforward
++;
335 if (ipx
->ipx_tc
> IPX_MAXHOPS
) {
336 ipxstat
.ipxs_cantforward
++;
341 if ((ok_there
= ipx_do_route(&ipx
->ipx_dna
,&ipx_droute
)) == 0) {
342 ipxstat
.ipxs_noroute
++;
347 * Here we think about forwarding broadcast packets,
348 * so we try to insure that it doesn't go back out
349 * on the interface it came in on. Also, if we
350 * are going to physically broadcast this, let us
351 * age the packet so we can eat it safely the second time around.
353 if (ipx
->ipx_dna
.x_host
.c_host
[0] & 0x1) {
354 struct ipx_ifaddr
*ia
= ipx_iaonnetof(&ipx
->ipx_dna
);
357 /* I'm gonna hafta eat this packet */
358 agedelta
+= IPX_MAXHOPS
- ipx
->ipx_tc
;
359 ipx
->ipx_tc
= IPX_MAXHOPS
;
361 if ((ok_back
= ipx_do_route(&ipx
->ipx_sna
,&ipx_sroute
)) == 0) {
362 /* error = ENETUNREACH; He'll never get it! */
363 ipxstat
.ipxs_noroute
++;
367 if (ipx_droute
.ro_rt
&&
368 (ifp
= ipx_droute
.ro_rt
->rt_ifp
) &&
370 (ifp
!= ipx_sroute
.ro_rt
->rt_ifp
)) {
371 flags
|= IPX_ALLOWBROADCAST
;
373 ipxstat
.ipxs_noroute
++;
379 * We don't need to recompute checksum because ipx_tc field
380 * is ignored by checksum calculation routine, however
381 * it may be desirable to reset checksum if ipxcksum == 0
385 ipx
->ipx_sum
= 0xffff;
388 error
= ipx_outputfl(m
, &ipx_droute
, flags
);
390 ipxstat
.ipxs_forward
++;
393 kprintf("forward: ");
394 ipx_printhost(&ipx
->ipx_sna
);
396 ipx_printhost(&ipx
->ipx_dna
);
397 kprintf(" hops %d\n", ipx
->ipx_tc
);
399 } else if (mcopy
!= NULL
) {
400 ipx
= mtod(mcopy
, struct ipx
*);
408 ipxstat
.ipxs_noroute
++;
412 ipxstat
.ipxs_mtutoosmall
++;
416 ipxstat
.ipxs_odropped
++;
424 ipx_undo_route(&ipx_droute
);
426 ipx_undo_route(&ipx_sroute
);
432 ipx_do_route(struct ipx_addr
*src
, struct route
*ro
)
434 struct sockaddr_ipx
*dst
;
436 bzero((caddr_t
)ro
, sizeof(*ro
));
437 dst
= (struct sockaddr_ipx
*)&ro
->ro_dst
;
439 dst
->sipx_len
= sizeof(*dst
);
440 dst
->sipx_family
= AF_IPX
;
441 dst
->sipx_addr
= *src
;
442 dst
->sipx_addr
.x_port
= 0;
444 if (ro
->ro_rt
== NULL
|| ro
->ro_rt
->rt_ifp
== NULL
) {
452 ipx_undo_route(struct route
*ro
)
454 if (ro
->ro_rt
!= NULL
) {
460 ipx_watch_output(struct mbuf
*m
, struct ifnet
*ifp
)
463 struct ipx_ifaddr
*ia
;
466 * Give any raw listeners a crack at the packet
468 LIST_FOREACH(ipxp
, &ipxrawpcb_list
, ipxp_list
) {
469 struct mbuf
*m0
= m_copy(m
, 0, (int)M_COPYALL
);
473 M_PREPEND(m0
, sizeof(*ipx
), MB_DONTWAIT
);
476 ipx
= mtod(m0
, struct ipx
*);
477 ipx
->ipx_sna
.x_net
= ipx_zeronet
;
478 for (ia
= ipx_ifaddr
; ia
!= NULL
; ia
= ia
->ia_next
)
479 if (ifp
== ia
->ia_ifp
)
482 ipx
->ipx_sna
.x_host
= ipx_zerohost
;
484 ipx
->ipx_sna
.x_host
=
485 ia
->ia_addr
.sipx_addr
.x_host
;
487 if (ifp
!= NULL
&& (ifp
->if_flags
& IFF_POINTOPOINT
)) {
488 struct ifaddr_container
*ifac
;
490 TAILQ_FOREACH(ifac
, &ifp
->if_addrheads
[mycpuid
],
492 struct ifaddr
*ifa
= ifac
->ifa
;
494 if (ifa
->ifa_addr
->sa_family
== AF_IPX
) {
495 ipx
->ipx_sna
= IA_SIPX(ifa
)->sipx_addr
;
500 ipx
->ipx_len
= ntohl(m0
->m_pkthdr
.len
);