af.c revision 12620 
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 * $Id: af.c,v 1.1 1995/10/26 21:28:13 julian Exp $
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	register long hash = 0;
97	register u_short *s = sipx->sipx_addr.x_host.s_host;
98	union ipx_net_u net;
99
100	net.net_e = sipx->sipx_addr.x_net;
101	hp->afh_nethash = net.long_e;
102	hash = *s++; hash <<= 8; hash += *s++; hash <<= 8; hash += *s;
103	hp->afh_hosthash = hash;
104}
105
106int
107ipxnet_netmatch(sxn1, sxn2)
108	struct sockaddr_ipx *sxn1, *sxn2;
109{
110	return (ipx_neteq(sxn1->sipx_addr, sxn2->sipx_addr));
111}
112
113/*
114 * Verify the message is from the right port.
115 */
116int
117ipxnet_portmatch(sipx)
118	register struct sockaddr_ipx *sipx;
119{
120
121	return (ntohs(sipx->sipx_addr.x_port) == IPXPORT_RIP );
122}
123
124
125/*
126 * ipx output routine.
127 */
128#ifdef DEBUG
129int do_output = 0;
130#endif
131void
132ipxnet_output(s, flags, sipx, size)
133	int s;
134	int flags;
135	struct sockaddr_ipx *sipx;
136	int size;
137{
138	struct sockaddr_ipx dst;
139
140	dst = *sipx;
141	sipx = &dst;
142	if (sipx->sipx_addr.x_port == 0)
143		sipx->sipx_addr.x_port = htons(IPXPORT_RIP);
144#ifdef DEBUG
145	if(do_output || ntohs(msg->rip_cmd) == RIPCMD_REQUEST)
146#endif
147	/*
148	 * Kludge to allow us to get routes out to machines that
149	 * don't know their addresses yet; send to that address on
150	 * ALL connected nets
151	 */
152	 if (ipx_neteqnn(sipx->sipx_addr.x_net, ipx_zeronet)) {
153	 	extern  struct interface *ifnet;
154	 	register struct interface *ifp;
155
156		for (ifp = ifnet; ifp; ifp = ifp->int_next) {
157			sipx->sipx_addr.x_net =
158				satoipx_addr(ifp->int_addr).x_net;
159			(void) sendto(s, msg, size, flags,
160			    (struct sockaddr *)sipx, sizeof (*sipx));
161		}
162		return;
163	}
164
165	(void) sendto(s, msg, size, flags,
166	    (struct sockaddr *)sipx, sizeof (*sipx));
167}
168
169/*
170 * Return 1 if we want this route.
171 * We use this to disallow route net G entries for one for multiple
172 * point to point links.
173 */
174int
175ipxnet_checkhost(sipx)
176	struct sockaddr_ipx *sipx;
177{
178	register struct interface *ifp = if_ifwithnet((struct sockaddr *)sipx);
179	/*
180	 * We want this route if there is no more than one
181	 * point to point interface with this network.
182	 */
183	if (ifp == 0 || (ifp->int_flags & IFF_POINTOPOINT)==0) return (1);
184	return (ifp->int_sq.n == ifp->int_sq.p);
185}
186
187/*
188 * Return 1 if the address is
189 * for a host, 0 for a network.
190 */
191int
192ipxnet_ishost(sipx)
193struct sockaddr_ipx *sipx;
194{
195	register u_short *s = sipx->sipx_addr.x_host.s_host;
196
197	if ((s[0]==0x0000) && (s[1]==0x0000) && (s[2]==0x0000))
198		return (0);
199	if ((s[0]==0xffff) && (s[1]==0xffff) && (s[2]==0xffff))
200		return (0);
201
202	return (1);
203}
204
205void
206ipxnet_canon(sipx)
207	struct sockaddr_ipx *sipx;
208{
209
210	sipx->sipx_addr.x_port = 0;
211}
212
213void
214null_hash(addr, hp)
215	struct sockaddr *addr;
216	struct afhash *hp;
217{
218
219	hp->afh_nethash = hp->afh_hosthash = 0;
220}
221
222int
223null_netmatch(a1, a2)
224	struct sockaddr *a1, *a2;
225{
226
227	return (0);
228}
229
230void
231null_output(s, f, a1, n)
232	int s;
233	int f;
234	struct sockaddr *a1;
235	int n;
236{
237
238	;
239}
240
241int
242null_portmatch(a1)
243	struct sockaddr *a1;
244{
245
246	return (0);
247}
248
249int
250null_portcheck(a1)
251	struct sockaddr *a1;
252{
253
254	return (0);
255}
256
257int
258null_ishost(a1)
259	struct sockaddr *a1;
260{
261
262	return (0);
263}
264
265int
266null_checkhost(a1)
267	struct sockaddr *a1;
268{
269
270	return (0);
271}
272
273void
274null_canon(a1)
275	struct sockaddr *a1;
276{
277
278	;
279}
280
281