1 /*
2 * Copyright (c) 1985, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This file includes significant work done at Cornell University by
6 * Bill Nesheim. That work included by permission.
7 *
8 * %sccs.include.redist.c%
9 */
10
11 #ifndef lint
12 static char sccsid[] = "@(#)af.c 8.1 (Berkeley) 06/05/93";
13 #endif /* not lint */
14
15 #include "defs.h"
16
17 /*
18 * Address family support routines
19 */
20 int null_hash(), null_netmatch(), null_output(),
21 null_portmatch(), null_portcheck(),
22 null_checkhost(), null_ishost(), null_canon();
23 int xnnet_hash(), xnnet_netmatch(), xnnet_output(),
24 xnnet_portmatch(),
25 xnnet_checkhost(), xnnet_ishost(), xnnet_canon();
26 #define NIL \
27 { null_hash, null_netmatch, null_output, \
28 null_portmatch, null_portcheck, null_checkhost, \
29 null_ishost, null_canon }
30 #define XNSNET \
31 { xnnet_hash, xnnet_netmatch, xnnet_output, \
32 xnnet_portmatch, xnnet_portmatch, xnnet_checkhost, \
33 xnnet_ishost, xnnet_canon }
34
35 struct afswitch afswitch[AF_MAX] =
36 { NIL, NIL, NIL, NIL, NIL, NIL, XNSNET, NIL, NIL, NIL, NIL };
37
38 struct sockaddr_ns xnnet_default = { sizeof(struct sockaddr_ns), AF_NS };
39
40 union ns_net ns_anynet;
41 union ns_net ns_zeronet;
42
xnnet_hash(sns,hp)43 xnnet_hash(sns, hp)
44 register struct sockaddr_ns *sns;
45 struct afhash *hp;
46 {
47 register long hash = 0;
48 register u_short *s = sns->sns_addr.x_host.s_host;
49 union ns_net_u net;
50
51 net.net_e = sns->sns_addr.x_net;
52 hp->afh_nethash = net.long_e;
53 hash = *s++; hash <<= 8; hash += *s++; hash <<= 8; hash += *s;
54 hp->afh_hosthash = hash;
55 }
56
57 xnnet_netmatch(sxn1, sxn2)
58 struct sockaddr_ns *sxn1, *sxn2;
59 {
60 return (ns_neteq(sxn1->sns_addr, sxn2->sns_addr));
61 }
62
63 /*
64 * Verify the message is from the right port.
65 */
xnnet_portmatch(sns)66 xnnet_portmatch(sns)
67 register struct sockaddr_ns *sns;
68 {
69
70 return (ntohs(sns->sns_addr.x_port) == IDPPORT_RIF );
71 }
72
73
74 /*
75 * xns output routine.
76 */
77 #ifdef DEBUG
78 int do_output = 0;
79 #endif
xnnet_output(flags,sns,size)80 xnnet_output(flags, sns, size)
81 int flags;
82 struct sockaddr_ns *sns;
83 int size;
84 {
85 struct sockaddr_ns dst;
86
87 dst = *sns;
88 sns = &dst;
89 if (sns->sns_addr.x_port == 0)
90 sns->sns_addr.x_port = htons(IDPPORT_RIF);
91 #ifdef DEBUG
92 if(do_output || ntohs(msg->rip_cmd) == RIPCMD_REQUEST)
93 #endif
94 /*
95 * Kludge to allow us to get routes out to machines that
96 * don't know their addresses yet; send to that address on
97 * ALL connected nets
98 */
99 if (ns_neteqnn(sns->sns_addr.x_net, ns_zeronet)) {
100 extern struct interface *ifnet;
101 register struct interface *ifp;
102
103 for (ifp = ifnet; ifp; ifp = ifp->int_next) {
104 sns->sns_addr.x_net =
105 satons_addr(ifp->int_addr).x_net;
106 (void) sendto(s, msg, size, flags,
107 (struct sockaddr *)sns, sizeof (*sns));
108 }
109 return;
110 }
111
112 (void) sendto(s, msg, size, flags,
113 (struct sockaddr *)sns, sizeof (*sns));
114 }
115
116 /*
117 * Return 1 if we want this route.
118 * We use this to disallow route net G entries for one for multiple
119 * point to point links.
120 */
121 xnnet_checkhost(sns)
122 struct sockaddr_ns *sns;
123 {
124 register struct interface *ifp = if_ifwithnet(sns);
125 /*
126 * We want this route if there is no more than one
127 * point to point interface with this network.
128 */
129 if (ifp == 0 || (ifp->int_flags & IFF_POINTOPOINT)==0) return (1);
130 return (ifp->int_sq.n == ifp->int_sq.p);
131 }
132
133 /*
134 * Return 1 if the address is
135 * for a host, 0 for a network.
136 */
137 xnnet_ishost(sns)
138 struct sockaddr_ns *sns;
139 {
140 register u_short *s = sns->sns_addr.x_host.s_host;
141
142 if ((s[0]==0xffff) && (s[1]==0xffff) && (s[2]==0xffff))
143 return (0);
144 else
145 return (1);
146 }
147
148 xnnet_canon(sns)
149 struct sockaddr_ns *sns;
150 {
151
152 sns->sns_addr.x_port = 0;
153 }
154
155 /*ARGSUSED*/
156 null_hash(addr, hp)
157 struct sockaddr *addr;
158 struct afhash *hp;
159 {
160
161 hp->afh_nethash = hp->afh_hosthash = 0;
162 }
163
164 /*ARGSUSED*/
165 null_netmatch(a1, a2)
166 struct sockaddr *a1, *a2;
167 {
168
169 return (0);
170 }
171
172 /*ARGSUSED*/
null_output(s,f,a1,n)173 null_output(s, f, a1, n)
174 int s, f;
175 struct sockaddr *a1;
176 int n;
177 {
178
179 ;
180 }
181
182 /*ARGSUSED*/
183 null_portmatch(a1)
184 struct sockaddr *a1;
185 {
186
187 return (0);
188 }
189
190 /*ARGSUSED*/
191 null_portcheck(a1)
192 struct sockaddr *a1;
193 {
194
195 return (0);
196 }
197
198 /*ARGSUSED*/
199 null_ishost(a1)
200 struct sockaddr *a1;
201 {
202
203 return (0);
204 }
205
206 /*ARGSUSED*/
207 null_checkhost(a1)
208 struct sockaddr *a1;
209 {
210
211 return (0);
212 }
213
214 /*ARGSUSED*/
215 null_canon(a1)
216 struct sockaddr *a1;
217 {
218
219 ;
220 }
221