Commit | Line | Data |
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5ff67f98 DF |
1 | /* |
2 | * Copyright (c) 1983 Regents of the University of California. | |
0eb85d71 KB |
3 | * All rights reserved. |
4 | * | |
5 | * Redistribution and use in source and binary forms are permitted | |
6 | * provided that this notice is preserved and that due credit is given | |
7 | * to the University of California at Berkeley. The name of the University | |
8 | * may not be used to endorse or promote products derived from this | |
9 | * software without specific prior written permission. This software | |
10 | * is provided ``as is'' without express or implied warranty. | |
5ff67f98 DF |
11 | */ |
12 | ||
b9b7b06a | 13 | #ifndef lint |
0eb85d71 KB |
14 | static char sccsid[] = "@(#)tables.c 5.11 (Berkeley) %G%"; |
15 | #endif /* not lint */ | |
b9b7b06a SL |
16 | |
17 | /* | |
18 | * Routing Table Management Daemon | |
19 | */ | |
7fe7fe74 | 20 | #include "defs.h" |
b9b7b06a SL |
21 | #include <sys/ioctl.h> |
22 | #include <errno.h> | |
69b7ef61 | 23 | #include <syslog.h> |
b9b7b06a SL |
24 | |
25 | #ifndef DEBUG | |
26 | #define DEBUG 0 | |
27 | #endif | |
28 | ||
29 | int install = !DEBUG; /* if 1 call kernel */ | |
30 | ||
31 | /* | |
32 | * Lookup dst in the tables for an exact match. | |
33 | */ | |
34 | struct rt_entry * | |
35 | rtlookup(dst) | |
36 | struct sockaddr *dst; | |
37 | { | |
38 | register struct rt_entry *rt; | |
39 | register struct rthash *rh; | |
d5568f13 | 40 | register u_int hash; |
b9b7b06a SL |
41 | struct afhash h; |
42 | int doinghost = 1; | |
43 | ||
17fe297f | 44 | if (dst->sa_family >= af_max) |
b9b7b06a SL |
45 | return (0); |
46 | (*afswitch[dst->sa_family].af_hash)(dst, &h); | |
47 | hash = h.afh_hosthash; | |
49139b80 | 48 | rh = &hosthash[hash & ROUTEHASHMASK]; |
b9b7b06a SL |
49 | again: |
50 | for (rt = rh->rt_forw; rt != (struct rt_entry *)rh; rt = rt->rt_forw) { | |
51 | if (rt->rt_hash != hash) | |
52 | continue; | |
53 | if (equal(&rt->rt_dst, dst)) | |
54 | return (rt); | |
55 | } | |
56 | if (doinghost) { | |
57 | doinghost = 0; | |
58 | hash = h.afh_nethash; | |
49139b80 | 59 | rh = &nethash[hash & ROUTEHASHMASK]; |
b9b7b06a SL |
60 | goto again; |
61 | } | |
62 | return (0); | |
63 | } | |
64 | ||
65 | /* | |
66 | * Find a route to dst as the kernel would. | |
67 | */ | |
68 | struct rt_entry * | |
69 | rtfind(dst) | |
70 | struct sockaddr *dst; | |
71 | { | |
72 | register struct rt_entry *rt; | |
73 | register struct rthash *rh; | |
d5568f13 | 74 | register u_int hash; |
b9b7b06a SL |
75 | struct afhash h; |
76 | int af = dst->sa_family; | |
77 | int doinghost = 1, (*match)(); | |
78 | ||
17fe297f | 79 | if (af >= af_max) |
b9b7b06a SL |
80 | return (0); |
81 | (*afswitch[af].af_hash)(dst, &h); | |
82 | hash = h.afh_hosthash; | |
49139b80 | 83 | rh = &hosthash[hash & ROUTEHASHMASK]; |
b9b7b06a SL |
84 | |
85 | again: | |
86 | for (rt = rh->rt_forw; rt != (struct rt_entry *)rh; rt = rt->rt_forw) { | |
87 | if (rt->rt_hash != hash) | |
88 | continue; | |
89 | if (doinghost) { | |
90 | if (equal(&rt->rt_dst, dst)) | |
91 | return (rt); | |
92 | } else { | |
93 | if (rt->rt_dst.sa_family == af && | |
94 | (*match)(&rt->rt_dst, dst)) | |
95 | return (rt); | |
96 | } | |
97 | } | |
98 | if (doinghost) { | |
99 | doinghost = 0; | |
100 | hash = h.afh_nethash; | |
49139b80 | 101 | rh = &nethash[hash & ROUTEHASHMASK]; |
b9b7b06a SL |
102 | match = afswitch[af].af_netmatch; |
103 | goto again; | |
104 | } | |
105 | return (0); | |
106 | } | |
107 | ||
108 | rtadd(dst, gate, metric, state) | |
109 | struct sockaddr *dst, *gate; | |
110 | int metric, state; | |
111 | { | |
112 | struct afhash h; | |
113 | register struct rt_entry *rt; | |
114 | struct rthash *rh; | |
7892134c | 115 | int af = dst->sa_family, flags; |
d5568f13 | 116 | u_int hash; |
b9b7b06a | 117 | |
17fe297f | 118 | if (af >= af_max) |
b9b7b06a SL |
119 | return; |
120 | (*afswitch[af].af_hash)(dst, &h); | |
4fad5a6e MK |
121 | flags = (*afswitch[af].af_rtflags)(dst); |
122 | /* | |
123 | * Subnet flag isn't visible to kernel, move to state. XXX | |
124 | */ | |
125 | if (flags & RTF_SUBNET) { | |
126 | state |= RTS_SUBNET; | |
127 | flags &= ~RTF_SUBNET; | |
128 | } | |
b9b7b06a SL |
129 | if (flags & RTF_HOST) { |
130 | hash = h.afh_hosthash; | |
49139b80 | 131 | rh = &hosthash[hash & ROUTEHASHMASK]; |
b9b7b06a SL |
132 | } else { |
133 | hash = h.afh_nethash; | |
49139b80 | 134 | rh = &nethash[hash & ROUTEHASHMASK]; |
b9b7b06a SL |
135 | } |
136 | rt = (struct rt_entry *)malloc(sizeof (*rt)); | |
137 | if (rt == 0) | |
138 | return; | |
139 | rt->rt_hash = hash; | |
140 | rt->rt_dst = *dst; | |
141 | rt->rt_router = *gate; | |
b9b7b06a SL |
142 | rt->rt_timer = 0; |
143 | rt->rt_flags = RTF_UP | flags; | |
144 | rt->rt_state = state | RTS_CHANGED; | |
4fad5a6e MK |
145 | rt->rt_ifp = if_ifwithdstaddr(&rt->rt_router); |
146 | if (rt->rt_ifp == 0) | |
147 | rt->rt_ifp = if_ifwithnet(&rt->rt_router); | |
88709531 | 148 | if ((state & RTS_INTERFACE) == 0) |
b9b7b06a | 149 | rt->rt_flags |= RTF_GATEWAY; |
7892134c | 150 | rt->rt_metric = metric; |
b9b7b06a SL |
151 | insque(rt, rh); |
152 | TRACE_ACTION(ADD, rt); | |
a8d9e287 SL |
153 | /* |
154 | * If the ioctl fails because the gateway is unreachable | |
155 | * from this host, discard the entry. This should only | |
156 | * occur because of an incorrect entry in /etc/gateways. | |
157 | */ | |
4fad5a6e MK |
158 | if (install && (rt->rt_state & (RTS_INTERNAL | RTS_EXTERNAL)) == 0 && |
159 | ioctl(s, SIOCADDRT, (char *)&rt->rt_rt) < 0) { | |
7892134c | 160 | if (errno != EEXIST && gate->sa_family < af_max) |
c766cf31 MK |
161 | syslog(LOG_ERR, |
162 | "adding route to net/host %s through gateway %s: %m\n", | |
163 | (*afswitch[dst->sa_family].af_format)(dst), | |
164 | (*afswitch[gate->sa_family].af_format)(gate)); | |
b9b7b06a | 165 | perror("SIOCADDRT"); |
a8d9e287 SL |
166 | if (errno == ENETUNREACH) { |
167 | TRACE_ACTION(DELETE, rt); | |
168 | remque(rt); | |
169 | free((char *)rt); | |
170 | } | |
171 | } | |
b9b7b06a SL |
172 | } |
173 | ||
174 | rtchange(rt, gate, metric) | |
175 | struct rt_entry *rt; | |
176 | struct sockaddr *gate; | |
177 | short metric; | |
178 | { | |
7892134c | 179 | int add = 0, delete = 0, metricchanged = 0; |
b9b7b06a SL |
180 | struct rtentry oldroute; |
181 | ||
7892134c MK |
182 | if ((rt->rt_state & RTS_INTERNAL) == 0) { |
183 | /* | |
184 | * If changing to different router, we need to add | |
185 | * new route and delete old one if in the kernel. | |
186 | * If the router is the same, we need to delete | |
187 | * the route if has become unreachable, or re-add | |
188 | * it if it had been unreachable. | |
189 | */ | |
190 | if (!equal(&rt->rt_router, gate)) { | |
191 | add++; | |
192 | if (rt->rt_metric != HOPCNT_INFINITY) | |
193 | delete++; | |
194 | } else if (metric == HOPCNT_INFINITY) | |
eb39c032 | 195 | delete++; |
7892134c MK |
196 | else if (rt->rt_metric == HOPCNT_INFINITY) |
197 | add++; | |
eb39c032 | 198 | } |
7892134c MK |
199 | if (metric != rt->rt_metric) |
200 | metricchanged++; | |
201 | if (delete || metricchanged) | |
b7e4f8be | 202 | TRACE_ACTION(CHANGE FROM, rt); |
7892134c MK |
203 | if ((rt->rt_state & RTS_INTERFACE) && delete) { |
204 | rt->rt_state &= ~RTS_INTERFACE; | |
205 | if (add) | |
88709531 | 206 | rt->rt_flags |= RTF_GATEWAY; |
7892134c MK |
207 | if (metric > rt->rt_metric && delete && |
208 | (rt->rt_state & RTS_INTERNAL) == 0) | |
aa7d0b61 MK |
209 | syslog(LOG_ERR, |
210 | "changing route from interface %s (timed out)", | |
211 | rt->rt_ifp->int_name); | |
b9b7b06a | 212 | } |
7892134c MK |
213 | if (delete) |
214 | oldroute = rt->rt_rt; | |
215 | if (add) { | |
216 | rt->rt_router = *gate; | |
217 | rt->rt_ifp = if_ifwithdstaddr(&rt->rt_router); | |
218 | if (rt->rt_ifp == 0) | |
219 | rt->rt_ifp = if_ifwithnet(&rt->rt_router); | |
220 | } | |
221 | rt->rt_metric = metric; | |
222 | rt->rt_state |= RTS_CHANGED; | |
223 | if (add || metricchanged) | |
224 | TRACE_ACTION(CHANGE TO, rt); | |
225 | if (add && install) | |
b7e4f8be MK |
226 | if (ioctl(s, SIOCADDRT, (char *)&rt->rt_rt) < 0) |
227 | perror("SIOCADDRT"); | |
7892134c | 228 | if (delete && install) |
b7e4f8be MK |
229 | if (ioctl(s, SIOCDELRT, (char *)&oldroute) < 0) |
230 | perror("SIOCDELRT"); | |
b9b7b06a SL |
231 | } |
232 | ||
233 | rtdelete(rt) | |
234 | struct rt_entry *rt; | |
235 | { | |
a8d9e287 | 236 | |
7892134c | 237 | if ((rt->rt_state & (RTS_INTERFACE|RTS_INTERNAL)) == RTS_INTERFACE) |
69b7ef61 MK |
238 | syslog(LOG_ERR, "deleting route to interface %s (timed out)", |
239 | rt->rt_ifp->int_name); | |
b9b7b06a | 240 | TRACE_ACTION(DELETE, rt); |
b1d43e6c | 241 | if (install && (rt->rt_state & (RTS_INTERNAL | RTS_EXTERNAL)) == 0 && |
4fad5a6e | 242 | ioctl(s, SIOCDELRT, (char *)&rt->rt_rt)) |
b9b7b06a SL |
243 | perror("SIOCDELRT"); |
244 | remque(rt); | |
245 | free((char *)rt); | |
246 | } | |
247 | ||
7892134c MK |
248 | rtdeleteall(s) |
249 | int s; | |
250 | { | |
251 | register struct rthash *rh; | |
252 | register struct rt_entry *rt; | |
253 | struct rthash *base = hosthash; | |
254 | int doinghost = 1; | |
255 | ||
256 | again: | |
257 | for (rh = base; rh < &base[ROUTEHASHSIZ]; rh++) { | |
258 | rt = rh->rt_forw; | |
259 | for (; rt != (struct rt_entry *)rh; rt = rt->rt_forw) { | |
260 | if (rt->rt_state & RTS_INTERFACE) | |
261 | continue; | |
262 | TRACE_ACTION(DELETE, rt); | |
263 | if ((rt->rt_state & (RTS_INTERNAL|RTS_EXTERNAL)) == 0 && | |
264 | ioctl(s, SIOCDELRT, (char *)&rt->rt_rt)) | |
265 | perror("SIOCDELRT"); | |
266 | } | |
267 | } | |
268 | if (doinghost) { | |
269 | doinghost = 0; | |
270 | base = nethash; | |
271 | goto again; | |
272 | } | |
273 | hup(s); | |
274 | } | |
275 | ||
ad34083f MK |
276 | /* |
277 | * If we have an interface to the wide, wide world, | |
278 | * add an entry for an Internet default route (wildcard) to the internal | |
279 | * tables and advertise it. This route is not added to the kernel routes, | |
280 | * but this entry prevents us from listening to other people's defaults | |
281 | * and installing them in the kernel here. | |
282 | */ | |
283 | rtdefault() | |
284 | { | |
ad34083f MK |
285 | extern struct sockaddr inet_default; |
286 | ||
4fad5a6e MK |
287 | rtadd(&inet_default, &inet_default, 0, |
288 | RTS_CHANGED | RTS_PASSIVE | RTS_INTERNAL); | |
ad34083f MK |
289 | } |
290 | ||
b9b7b06a SL |
291 | rtinit() |
292 | { | |
293 | register struct rthash *rh; | |
294 | ||
295 | for (rh = nethash; rh < &nethash[ROUTEHASHSIZ]; rh++) | |
296 | rh->rt_forw = rh->rt_back = (struct rt_entry *)rh; | |
297 | for (rh = hosthash; rh < &hosthash[ROUTEHASHSIZ]; rh++) | |
298 | rh->rt_forw = rh->rt_back = (struct rt_entry *)rh; | |
299 | } |