af.c revision 50479 
1/*
2 * Copyright (c) 1985, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Copyright (c) 1995 John Hay.  All rights reserved.
6 *
7 * This file includes significant work done at Cornell University by
8 * Bill Nesheim.  That work included by permission.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 *    must display the following acknowledgement:
20 *	This product includes software developed by the University of
21 *	California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 *    may be used to endorse or promote products derived from this software
24 *    without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 *
38 * $FreeBSD: head/usr.sbin/IPXrouted/af.c 50479 1999-08-28 01:35:59Z peter $
39 */
40
41#ifndef lint
42static char sccsid[] = "@(#)af.c	8.1 (Berkeley) 6/5/93";
43#endif /* not lint */
44
45#include "defs.h"
46
47/*
48 * Address family support routines
49 */
50af_hash_t	null_hash;
51af_netmatch_t	null_netmatch;
52af_output_t	null_output;
53af_portmatch_t	null_portmatch;
54af_portcheck_t	null_portcheck;
55af_checkhost_t	null_checkhost;
56af_ishost_t	null_ishost;
57af_canon_t	null_canon;
58
59void	ipxnet_hash(struct sockaddr_ipx *, struct afhash *);
60int	ipxnet_netmatch(struct sockaddr_ipx *, struct sockaddr_ipx *);
61void	ipxnet_output(int, int, struct sockaddr_ipx *, int);
62int	ipxnet_portmatch(struct sockaddr_ipx *);
63int	ipxnet_checkhost(struct sockaddr_ipx *);
64int	ipxnet_ishost(struct sockaddr_ipx *);
65void	ipxnet_canon(struct sockaddr_ipx *);
66
67#define NIL \
68	{ null_hash,		null_netmatch,		null_output, \
69	  null_portmatch,	null_portcheck,		null_checkhost, \
70	  null_ishost,		null_canon }
71#define	IPXNET \
72	{ (af_hash_t *)ipxnet_hash, \
73	  (af_netmatch_t *)ipxnet_netmatch, \
74	  (af_output_t *)ipxnet_output, \
75	  (af_portmatch_t *)ipxnet_portmatch, \
76	  (af_portcheck_t *)ipxnet_portmatch, \
77	  (af_checkhost_t *)ipxnet_checkhost, \
78	  (af_ishost_t *)ipxnet_ishost, \
79	  (af_canon_t *)ipxnet_canon }
80
81struct afswitch afswitch[AF_MAX] =
82	{ NIL, NIL, NIL, NIL, NIL, NIL, NIL, NIL, NIL, NIL,
83	  NIL, NIL, NIL, NIL, NIL, NIL, NIL, NIL, NIL, NIL,
84	  NIL, NIL, NIL, IPXNET, NIL, NIL };
85
86struct sockaddr_ipx ipxnet_default = { sizeof(struct sockaddr_ipx), AF_IPX };
87
88union ipx_net ipx_anynet;
89union ipx_net ipx_zeronet;
90
91void
92ipxnet_hash(sipx, hp)
93	register struct sockaddr_ipx *sipx;
94	struct afhash *hp;
95{
96	long hash;
97#if 0
98	u_short *s = sipx->sipx_addr.x_host.s_host;
99#endif
100	u_char *c;
101
102	c = sipx->sipx_addr.x_net.c_net;
103
104#define IMVAL	33
105	hash = 0;
106	hash = hash * IMVAL + *c++;
107	hash = hash * IMVAL + *c++;
108	hash = hash * IMVAL + *c++;
109	hash = hash * IMVAL + *c++;
110#undef IMVAL
111
112	hp->afh_nethash = hash;
113	hp->afh_nethash ^= (hash >> 8);
114	hp->afh_nethash ^= (hash >> 16);
115	hp->afh_nethash ^= (hash >> 24);
116
117#if 0
118	hash = 0;
119	hash = *s++; hash <<= 8; hash += *s++; hash <<= 8; hash += *s;
120	hp->afh_hosthash = hash;
121#endif
122}
123
124int
125ipxnet_netmatch(sxn1, sxn2)
126	struct sockaddr_ipx *sxn1, *sxn2;
127{
128	return (ipx_neteq(sxn1->sipx_addr, sxn2->sipx_addr));
129}
130
131/*
132 * Verify the message is from the right port.
133 */
134int
135ipxnet_portmatch(sipx)
136	register struct sockaddr_ipx *sipx;
137{
138
139	return (ntohs(sipx->sipx_addr.x_port) == IPXPORT_RIP );
140}
141
142
143/*
144 * ipx output routine.
145 */
146#ifdef DEBUG
147int do_output = 0;
148#endif
149void
150ipxnet_output(s, flags, sipx, size)
151	int s;
152	int flags;
153	struct sockaddr_ipx *sipx;
154	int size;
155{
156	struct sockaddr_ipx dst;
157
158	dst = *sipx;
159	sipx = &dst;
160	if (sipx->sipx_addr.x_port == 0)
161		sipx->sipx_addr.x_port = htons(IPXPORT_RIP);
162#ifdef DEBUG
163	if(do_output || ntohs(msg->rip_cmd) == RIPCMD_REQUEST)
164#endif
165	/*
166	 * Kludge to allow us to get routes out to machines that
167	 * don't know their addresses yet; send to that address on
168	 * ALL connected nets
169	 */
170	 if (ipx_neteqnn(sipx->sipx_addr.x_net, ipx_zeronet)) {
171	 	extern  struct interface *ifnet;
172	 	register struct interface *ifp;
173
174		for (ifp = ifnet; ifp; ifp = ifp->int_next) {
175			sipx->sipx_addr.x_net =
176				satoipx_addr(ifp->int_addr).x_net;
177			(void) sendto(s, msg, size, flags,
178			    (struct sockaddr *)sipx, sizeof (*sipx));
179		}
180		return;
181	}
182
183	(void) sendto(s, msg, size, flags,
184	    (struct sockaddr *)sipx, sizeof (*sipx));
185}
186
187/*
188 * Return 1 if we want this route.
189 * We use this to disallow route net G entries for one for multiple
190 * point to point links.
191 */
192int
193ipxnet_checkhost(sipx)
194	struct sockaddr_ipx *sipx;
195{
196	register struct interface *ifp = if_ifwithnet((struct sockaddr *)sipx);
197	/*
198	 * We want this route if there is no more than one
199	 * point to point interface with this network.
200	 */
201	if (ifp == 0 || (ifp->int_flags & IFF_POINTOPOINT)==0) return (1);
202	return (ifp->int_sq.n == ifp->int_sq.p);
203}
204
205/*
206 * Return 1 if the address is
207 * for a host, 0 for a network.
208 */
209int
210ipxnet_ishost(sipx)
211struct sockaddr_ipx *sipx;
212{
213	register u_short *s = sipx->sipx_addr.x_host.s_host;
214
215	if ((s[0]==0x0000) && (s[1]==0x0000) && (s[2]==0x0000))
216		return (0);
217	if ((s[0]==0xffff) && (s[1]==0xffff) && (s[2]==0xffff))
218		return (0);
219
220	return (1);
221}
222
223void
224ipxnet_canon(sipx)
225	struct sockaddr_ipx *sipx;
226{
227
228	sipx->sipx_addr.x_port = 0;
229}
230
231void
232null_hash(addr, hp)
233	struct sockaddr *addr;
234	struct afhash *hp;
235{
236
237	hp->afh_nethash = hp->afh_hosthash = 0;
238}
239
240int
241null_netmatch(a1, a2)
242	struct sockaddr *a1, *a2;
243{
244
245	return (0);
246}
247
248void
249null_output(s, f, a1, n)
250	int s;
251	int f;
252	struct sockaddr *a1;
253	int n;
254{
255
256	;
257}
258
259int
260null_portmatch(a1)
261	struct sockaddr *a1;
262{
263
264	return (0);
265}
266
267int
268null_portcheck(a1)
269	struct sockaddr *a1;
270{
271
272	return (0);
273}
274
275int
276null_ishost(a1)
277	struct sockaddr *a1;
278{
279
280	return (0);
281}
282
283int
284null_checkhost(a1)
285	struct sockaddr *a1;
286{
287
288	return (0);
289}
290
291void
292null_canon(a1)
293	struct sockaddr *a1;
294{
295
296	;
297}
298
299