Commit | Line | Data |
---|---|---|
5ff67f98 DF |
1 | /* |
2 | * Copyright (c) 1983 Regents of the University of California. | |
3 | * All rights reserved. The Berkeley software License Agreement | |
4 | * specifies the terms and conditions for redistribution. | |
5 | */ | |
6 | ||
2e74322d | 7 | #ifndef lint |
4fad5a6e | 8 | static char sccsid[] = "@(#)input.c 5.4 (Berkeley) %G%"; |
5ff67f98 | 9 | #endif not lint |
2e74322d SL |
10 | |
11 | /* | |
12 | * Routing Table Management Daemon | |
13 | */ | |
7fe7fe74 | 14 | #include "defs.h" |
17fe297f | 15 | #include <sys/syslog.h> |
2e74322d SL |
16 | |
17 | /* | |
18 | * Process a newly received packet. | |
19 | */ | |
20 | rip_input(from, size) | |
21 | struct sockaddr *from; | |
22 | int size; | |
23 | { | |
20df59f1 MK |
24 | register struct rt_entry *rt; |
25 | register struct netinfo *n; | |
26 | register struct interface *ifp; | |
27 | struct interface *if_ifwithdstaddr(); | |
2e74322d | 28 | int newsize; |
20df59f1 | 29 | register struct afswitch *afp; |
2e74322d SL |
30 | |
31 | ifp = 0; | |
32 | TRACE_INPUT(ifp, from, size); | |
17fe297f MK |
33 | if (from->sa_family >= af_max || |
34 | (afp = &afswitch[from->sa_family])->af_hash == (int (*)())0) { | |
35 | syslog(LOG_INFO, | |
36 | "\"from\" address in unsupported address family (%d), cmd %d\n", | |
37 | from->sa_family, msg->rip_cmd); | |
2e74322d | 38 | return; |
17fe297f | 39 | } |
2e74322d SL |
40 | switch (msg->rip_cmd) { |
41 | ||
42 | case RIPCMD_REQUEST: | |
43 | newsize = 0; | |
44 | size -= 4 * sizeof (char); | |
45 | n = msg->rip_nets; | |
46 | while (size > 0) { | |
47 | if (size < sizeof (struct netinfo)) | |
48 | break; | |
49 | size -= sizeof (struct netinfo); | |
50 | ||
55d340a4 SL |
51 | if (msg->rip_vers > 0) { |
52 | n->rip_dst.sa_family = | |
53 | ntohs(n->rip_dst.sa_family); | |
54 | n->rip_metric = ntohl(n->rip_metric); | |
55 | } | |
2e74322d SL |
56 | /* |
57 | * A single entry with sa_family == AF_UNSPEC and | |
58 | * metric ``infinity'' means ``all routes''. | |
17fe297f MK |
59 | * We respond to routers only if we are acting |
60 | * as a supplier, or to anyone other than a router | |
61 | * (eg, query). | |
2e74322d SL |
62 | */ |
63 | if (n->rip_dst.sa_family == AF_UNSPEC && | |
17deb420 MK |
64 | n->rip_metric == HOPCNT_INFINITY && size == 0) { |
65 | if (supplier || (*afp->af_portmatch)(from) == 0) | |
4fad5a6e | 66 | supply(from, 0, 0); |
2e74322d SL |
67 | return; |
68 | } | |
17deb420 MK |
69 | if (n->rip_dst.sa_family < af_max && |
70 | afswitch[n->rip_dst.sa_family].af_hash) | |
71 | rt = rtlookup(&n->rip_dst); | |
72 | else | |
73 | rt = 0; | |
2e74322d SL |
74 | n->rip_metric = rt == 0 ? HOPCNT_INFINITY : |
75 | min(rt->rt_metric+1, HOPCNT_INFINITY); | |
55d340a4 SL |
76 | if (msg->rip_vers > 0) { |
77 | n->rip_dst.sa_family = | |
78 | htons(n->rip_dst.sa_family); | |
79 | n->rip_metric = htonl(n->rip_metric); | |
80 | } | |
2e74322d SL |
81 | n++, newsize += sizeof (struct netinfo); |
82 | } | |
83 | if (newsize > 0) { | |
84 | msg->rip_cmd = RIPCMD_RESPONSE; | |
85 | newsize += sizeof (int); | |
4f4bffaa | 86 | (*afp->af_output)(s, 0, from, newsize); |
2e74322d SL |
87 | } |
88 | return; | |
89 | ||
90 | case RIPCMD_TRACEON: | |
91 | case RIPCMD_TRACEOFF: | |
b7e4f8be | 92 | /* verify message came from a privileged port */ |
2e74322d SL |
93 | if ((*afp->af_portcheck)(from) == 0) |
94 | return; | |
95 | packet[size] = '\0'; | |
96 | if (msg->rip_cmd == RIPCMD_TRACEON) | |
97 | traceon(msg->rip_tracefile); | |
98 | else | |
99 | traceoff(); | |
100 | return; | |
101 | ||
102 | case RIPCMD_RESPONSE: | |
103 | /* verify message came from a router */ | |
104 | if ((*afp->af_portmatch)(from) == 0) | |
105 | return; | |
106 | (*afp->af_canon)(from); | |
107 | /* are we talking to ourselves? */ | |
108 | ifp = if_ifwithaddr(from); | |
109 | if (ifp) { | |
110 | rt = rtfind(from); | |
b7e4f8be | 111 | if (rt == 0 || (rt->rt_state & RTS_INTERFACE) == 0) |
2e74322d SL |
112 | addrouteforif(ifp); |
113 | else | |
114 | rt->rt_timer = 0; | |
115 | return; | |
116 | } | |
f1e15e15 MK |
117 | /* |
118 | * Update timer for interface on which the packet arrived. | |
119 | * If from other end of a point-to-point link that isn't | |
120 | * in the routing tables, (re-)add the route. | |
121 | */ | |
b7e4f8be MK |
122 | if ((rt = rtfind(from)) && (rt->rt_state & RTS_INTERFACE)) |
123 | rt->rt_timer = 0; | |
f1e15e15 MK |
124 | else if (ifp = if_ifwithdstaddr(from)) |
125 | addrouteforif(ifp); | |
2e74322d SL |
126 | size -= 4 * sizeof (char); |
127 | n = msg->rip_nets; | |
128 | for (; size > 0; size -= sizeof (struct netinfo), n++) { | |
129 | if (size < sizeof (struct netinfo)) | |
130 | break; | |
55d340a4 SL |
131 | if (msg->rip_vers > 0) { |
132 | n->rip_dst.sa_family = | |
133 | ntohs(n->rip_dst.sa_family); | |
134 | n->rip_metric = ntohl(n->rip_metric); | |
135 | } | |
20df59f1 | 136 | if ((unsigned) n->rip_metric > HOPCNT_INFINITY) |
d5568f13 | 137 | continue; |
17fe297f MK |
138 | if (n->rip_dst.sa_family >= af_max || |
139 | (afp = &afswitch[n->rip_dst.sa_family])->af_hash == | |
140 | (int (*)())0) { | |
141 | syslog(LOG_INFO, | |
142 | "route in unsupported address family (%d), from %s (af %d)\n", | |
143 | n->rip_dst.sa_family, | |
144 | (*afswitch[from->sa_family].af_format)(from), | |
145 | from->sa_family); | |
ed36994a | 146 | continue; |
17fe297f MK |
147 | } |
148 | if (((*afp->af_checkhost)(&n->rip_dst)) == 0) { | |
149 | syslog(LOG_DEBUG, | |
150 | "bad host in route from %s (af %d)\n", | |
151 | (*afswitch[from->sa_family].af_format)(from), | |
152 | from->sa_family); | |
2e74322d | 153 | continue; |
17fe297f | 154 | } |
2e74322d SL |
155 | rt = rtlookup(&n->rip_dst); |
156 | if (rt == 0) { | |
20df59f1 MK |
157 | if (n->rip_metric < HOPCNT_INFINITY) |
158 | rtadd(&n->rip_dst, from, n->rip_metric, 0); | |
2e74322d SL |
159 | continue; |
160 | } | |
161 | ||
162 | /* | |
38ca17a8 MK |
163 | * Update if from gateway and different, |
164 | * shorter, or getting stale and equivalent. | |
2e74322d | 165 | */ |
15e56604 | 166 | if (equal(from, &rt->rt_router)) { |
20df59f1 MK |
167 | if (n->rip_metric == HOPCNT_INFINITY) { |
168 | rtdelete(rt); | |
169 | continue; | |
170 | } | |
15e56604 MK |
171 | if (n->rip_metric != rt->rt_metric) |
172 | rtchange(rt, from, n->rip_metric); | |
173 | rt->rt_timer = 0; | |
174 | } else if ((unsigned) (n->rip_metric) < rt->rt_metric || | |
2e74322d SL |
175 | (rt->rt_timer > (EXPIRE_TIME/2) && |
176 | rt->rt_metric == n->rip_metric)) { | |
177 | rtchange(rt, from, n->rip_metric); | |
178 | rt->rt_timer = 0; | |
179 | } | |
180 | } | |
181 | return; | |
182 | } | |
183 | } |