2 * Copyright (c) 1985, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Copyright (c) 1995 John Hay. All rights reserved.
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17 * This product includes software developed by the University of
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35 * $FreeBSD: src/usr.sbin/IPXrouted/tables.c,v 1.7 1999/08/28 01:15:05 peter Exp $
37 * @(#)tables.c 8.1 (Berkeley) 6/5/93
41 * Routing Table Management Daemon
44 #include <sys/ioctl.h>
54 #define FIXLEN(s) { if ((s)->sa_len == 0) (s)->sa_len = sizeof (*(s));}
56 int install = !DEBUG; /* if 1 call kernel */
59 struct rthash nethash[ROUTEHASHSIZ];
62 * Lookup dst in the tables for an exact match.
65 rtlookup(struct sockaddr *dst)
72 if (dst->sa_family >= AF_MAX)
74 (*afswitch[dst->sa_family].af_hash)(dst, &h);
76 rh = &nethash[hash & ROUTEHASHMASK];
77 for (rt = rh->rt_forw; rt != (struct rt_entry *)rh; rt = rt->rt_forw) {
78 if (rt->rt_hash != hash)
80 if (equal(&rt->rt_dst, dst))
87 * Find a route to dst as the kernel would.
90 rtfind(struct sockaddr *dst)
96 int af = dst->sa_family;
97 int (*match)() = NULL;
101 (*afswitch[af].af_hash)(dst, &h);
103 hash = h.afh_nethash;
104 rh = &nethash[hash & ROUTEHASHMASK];
105 match = afswitch[af].af_netmatch;
106 for (rt = rh->rt_forw; rt != (struct rt_entry *)rh; rt = rt->rt_forw) {
107 if (rt->rt_hash != hash)
109 if (rt->rt_dst.sa_family == af &&
110 (*match)(&rt->rt_dst, dst))
117 rtadd(struct sockaddr *dst, struct sockaddr *gate, short metric, short ticks,
123 int af = dst->sa_family, flags;
130 (*afswitch[af].af_hash)(dst, &h);
131 flags = (*afswitch[af].af_ishost)(dst) ? RTF_HOST : 0;
132 hash = h.afh_nethash;
133 rh = &nethash[hash & ROUTEHASHMASK];
134 rt = (struct rt_entry *)malloc(sizeof (*rt));
139 rt->rt_router = *gate;
140 rt->rt_metric = metric;
141 rt->rt_ticks = ticks;
143 rt->rt_flags = RTF_UP | flags;
144 rt->rt_state = state | RTS_CHANGED;
145 rt->rt_ifp = if_ifwithnet(&rt->rt_router);
148 rt->rt_flags |= RTF_GATEWAY;
150 TRACE_ACTION("ADD", rt);
152 * If the ioctl fails because the gateway is unreachable
153 * from this host, discard the entry. This should only
154 * occur because of an incorrect entry in /etc/gateways.
156 if (install && rtioctl(ADD, &rt->rt_rt) < 0) {
159 if (errno == ENETUNREACH) {
160 TRACE_ACTION("DELETE", rt);
168 rtadd_clone(struct rt_entry *ort, struct sockaddr *dst, struct sockaddr *gate,
169 short metric, short ticks, int state)
174 int af = dst->sa_family, flags;
181 (*afswitch[af].af_hash)(dst, &h);
182 flags = (*afswitch[af].af_ishost)(dst) ? RTF_HOST : 0;
183 hash = h.afh_nethash;
184 rh = &nethash[hash & ROUTEHASHMASK];
185 rt = (struct rt_entry *)malloc(sizeof (*rt));
190 rt->rt_router = *gate;
191 rt->rt_metric = metric;
192 rt->rt_ticks = ticks;
194 rt->rt_flags = RTF_UP | flags;
195 rt->rt_state = state | RTS_CHANGED;
196 rt->rt_ifp = if_ifwithnet(&rt->rt_router);
201 rt->rt_flags |= RTF_GATEWAY;
203 while(ort->rt_clone != NULL)
206 TRACE_ACTION("ADD_CLONE", rt);
210 rtchange(struct rt_entry *rt, struct sockaddr *gate, short metric, short ticks)
212 int doioctl = 0, metricchanged = 0;
213 struct rtuentry oldroute;
217 * Handling of clones.
218 * When the route changed and it had clones, handle it special.
219 * 1. If the new route is cheaper than the clone(s), free the clones.
220 * 2. If the new route is the same cost, it may be one of the clones,
221 * search for it and free it.
222 * 3. If the new route is more expensive than the clone(s), use the
223 * values of the clone(s).
226 if ((ticks < rt->rt_clone->rt_ticks) ||
227 ((ticks == rt->rt_clone->rt_ticks) &&
228 (metric < rt->rt_clone->rt_metric))) {
232 struct rt_entry *trt, *nrt;
241 } else if ((ticks == rt->rt_clone->rt_ticks) &&
242 (metric == rt->rt_clone->rt_metric)) {
243 struct rt_entry *prt, *trt;
249 if (equal(&trt->rt_router, gate)) {
250 prt->rt_clone = trt->rt_clone;
260 * Use the values of the first clone.
261 * Delete the corresponding clone.
263 struct rt_entry *trt;
266 rt->rt_clone = rt->rt_clone->rt_clone;
267 metric = trt->rt_metric;
268 ticks = trt->rt_ticks;
269 *gate = trt->rt_router;
274 if (!equal(&rt->rt_router, gate))
276 if ((metric != rt->rt_metric) || (ticks != rt->rt_ticks))
278 if (doioctl || metricchanged) {
279 TRACE_ACTION("CHANGE FROM", rt);
281 oldroute = rt->rt_rt;
282 rt->rt_router = *gate;
284 rt->rt_metric = metric;
285 rt->rt_ticks = ticks;
286 if ((rt->rt_state & RTS_INTERFACE) && metric) {
287 rt->rt_state &= ~RTS_INTERFACE;
290 "changing route from interface %s (timed out)",
291 rt->rt_ifp->int_name);
294 "changing route from interface ??? (timed out)");
297 rt->rt_flags |= RTF_GATEWAY;
299 rt->rt_flags &= ~RTF_GATEWAY;
300 rt->rt_ifp = if_ifwithnet(&rt->rt_router);
301 rt->rt_state |= RTS_CHANGED;
302 TRACE_ACTION("CHANGE TO", rt);
304 if (doioctl && install) {
306 if (rtioctl(ADD, &rt->rt_rt) < 0)
307 syslog(LOG_ERR, "rtioctl ADD dst %s, gw %s: %m",
308 ipx_ntoa(&((struct sockaddr_ipx *)&rt->rt_dst)->sipx_addr),
309 ipx_ntoa(&((struct sockaddr_ipx *)&rt->rt_router)->sipx_addr));
310 if (delete && rtioctl(DELETE, &oldroute) < 0)
311 perror("rtioctl DELETE");
314 if (rtioctl(ADD, &rt->rt_rt) >= 0)
317 if (rtioctl(CHANGE, &rt->rt_rt) >= 0)
320 syslog(LOG_ERR, "rtioctl ADD dst %s, gw %s: %m",
321 ipxdp_ntoa(&((struct sockaddr_ipx *)&rt->rt_dst)->sipx_addr),
322 ipxdp_ntoa(&((struct sockaddr_ipx *)&rt->rt_router)->sipx_addr));
328 rtdelete(struct rt_entry *rt)
330 struct sockaddr *sa = &(rt->rt_router);
337 * If there is a clone we just do a rt_change to it.
339 struct rt_entry *trt = rt->rt_clone;
340 rtchange(rt, &trt->rt_router, trt->rt_metric, trt->rt_ticks);
343 if (rt->rt_state & RTS_INTERFACE) {
346 "deleting route to interface %s (timed out)",
347 rt->rt_ifp->int_name);
350 "deleting route to interface ??? (timed out)");
352 TRACE_ACTION("DELETE", rt);
353 if (install && rtioctl(DELETE, &rt->rt_rt) < 0)
354 perror("rtioctl DELETE");
364 for (rh = nethash; rh < &nethash[ROUTEHASHSIZ]; rh++)
365 rh->rt_forw = rh->rt_back = (struct rt_entry *)rh;
370 rtioctl(int action, struct rtuentry *ort)
376 ort->rtu_rtflags = ort->rtu_flags;
381 return (ioctl(s, SIOCADDRT, (char *)ort));
384 return (ioctl(s, SIOCDELRT, (char *)ort));
391 struct rt_msghdr w_rtm;
392 struct sockaddr w_dst;
393 struct sockaddr w_gate;
394 struct sockaddr_ipx w_netmask;
398 bzero((char *)&w, sizeof(w));
399 rtm.rtm_msglen = sizeof(w);
400 rtm.rtm_version = RTM_VERSION;
401 rtm.rtm_type = (action == ADD ? RTM_ADD :
402 (action == DELETE ? RTM_DELETE : RTM_CHANGE));
403 rtm.rtm_flags = ort->rtu_flags;
404 rtm.rtm_seq = ++seqno;
405 rtm.rtm_addrs = RTA_DST|RTA_GATEWAY;
406 bcopy((char *)&ort->rtu_dst, (char *)&w.w_dst, sizeof(w.w_dst));
407 bcopy((char *)&ort->rtu_router, (char *)&w.w_gate, sizeof(w.w_gate));
408 w.w_gate.sa_family = w.w_dst.sa_family = AF_IPX;
409 w.w_gate.sa_len = w.w_dst.sa_len = sizeof(w.w_dst);
410 if (rtm.rtm_flags & RTF_HOST) {
411 rtm.rtm_msglen -= sizeof(w.w_netmask);
413 rtm.rtm_addrs |= RTA_NETMASK;
414 w.w_netmask = ipx_netmask;
415 rtm.rtm_msglen -= sizeof(w.w_netmask) - ipx_netmask.sipx_len;
418 return write(r, (char *)&w, rtm.rtm_msglen);