[unix-history] / usr / src / sbin / routed / tables.c

/*
 * Copyright (c) 1983 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

#ifndef lint
static char sccsid[] = "@(#)tables.c	5.7 (Berkeley) %G%";
#endif not lint

/*
 * Routing Table Management Daemon
 */
#include "defs.h"
#include <sys/ioctl.h>
#include <errno.h>
#include <syslog.h>

#ifndef DEBUG
#define	DEBUG	0
#endif

int	install = !DEBUG;		/* if 1 call kernel */

/*
 * Lookup dst in the tables for an exact match.
 */
struct rt_entry *
rtlookup(dst)
	struct sockaddr *dst;
{
	register struct rt_entry *rt;
	register struct rthash *rh;
	register u_int hash;
	struct afhash h;
	int doinghost = 1;

	if (dst->sa_family >= af_max)
		return (0);
	(*afswitch[dst->sa_family].af_hash)(dst, &h);
	hash = h.afh_hosthash;
	rh = &hosthash[hash & ROUTEHASHMASK];
again:
	for (rt = rh->rt_forw; rt != (struct rt_entry *)rh; rt = rt->rt_forw) {
		if (rt->rt_hash != hash)
			continue;
		if (equal(&rt->rt_dst, dst))
			return (rt);
	}
	if (doinghost) {
		doinghost = 0;
		hash = h.afh_nethash;
		rh = &nethash[hash & ROUTEHASHMASK];
		goto again;
	}
	return (0);
}

/*
 * Find a route to dst as the kernel would.
 */
struct rt_entry *
rtfind(dst)
	struct sockaddr *dst;
{
	register struct rt_entry *rt;
	register struct rthash *rh;
	register u_int hash;
	struct afhash h;
	int af = dst->sa_family;
	int doinghost = 1, (*match)();

	if (af >= af_max)
		return (0);
	(*afswitch[af].af_hash)(dst, &h);
	hash = h.afh_hosthash;
	rh = &hosthash[hash & ROUTEHASHMASK];

again:
	for (rt = rh->rt_forw; rt != (struct rt_entry *)rh; rt = rt->rt_forw) {
		if (rt->rt_hash != hash)
			continue;
		if (doinghost) {
			if (equal(&rt->rt_dst, dst))
				return (rt);
		} else {
			if (rt->rt_dst.sa_family == af &&
			    (*match)(&rt->rt_dst, dst))
				return (rt);
		}
	}
	if (doinghost) {
		doinghost = 0;
		hash = h.afh_nethash;
		rh = &nethash[hash & ROUTEHASHMASK];
		match = afswitch[af].af_netmatch;
		goto again;
	}
	return (0);
}

rtadd(dst, gate, metric, state)
	struct sockaddr *dst, *gate;
	int metric, state;
{
	struct afhash h;
	register struct rt_entry *rt;
	struct rthash *rh;
	int af = dst->sa_family, flags;
	u_int hash;

	if (af >= af_max)
		return;
	(*afswitch[af].af_hash)(dst, &h);
	flags = (*afswitch[af].af_rtflags)(dst);
	/*
	 * Subnet flag isn't visible to kernel, move to state.	XXX
	 */
	if (flags & RTF_SUBNET) {
		state |= RTS_SUBNET;
		flags &= ~RTF_SUBNET;
	}
	if (flags & RTF_HOST) {
		hash = h.afh_hosthash;
		rh = &hosthash[hash & ROUTEHASHMASK];
	} else {
		hash = h.afh_nethash;
		rh = &nethash[hash & ROUTEHASHMASK];
	}
	rt = (struct rt_entry *)malloc(sizeof (*rt));
	if (rt == 0)
		return;
	rt->rt_hash = hash;
	rt->rt_dst = *dst;
	rt->rt_router = *gate;
	rt->rt_timer = 0;
	rt->rt_flags = RTF_UP | flags;
	rt->rt_state = state | RTS_CHANGED;
	rt->rt_ifp = if_ifwithdstaddr(&rt->rt_router);
	if (rt->rt_ifp == 0)
		rt->rt_ifp = if_ifwithnet(&rt->rt_router);
	if (rt->rt_ifp == 0) {
		if (dst->sa_family < af_max && gate->sa_family < af_max)
			syslog(LOG_ERR,
		   "route to net/host %s goes through unreachable gateway %s\n",
			   (*afswitch[dst->sa_family].af_format)(dst),
			   (*afswitch[gate->sa_family].af_format)(gate));
		free((char *)rt);
		return;
	}
	if ((state & RTS_INTERFACE) == 0)
		rt->rt_flags |= RTF_GATEWAY;
	/*
	 * Set rt_ifmetric to the amount by which we
	 * increment the route when sending it to others.
	 */
	if (state & RTS_INTERFACE) {
		rt->rt_metric = 0;
		rt->rt_ifmetric = metric + 1;
	} else {
		rt->rt_metric = metric;
		rt->rt_ifmetric = rt->rt_ifp->int_metric + 1;
	}
	insque(rt, rh);
	TRACE_ACTION(ADD, rt);
	/*
	 * If the ioctl fails because the gateway is unreachable
	 * from this host, discard the entry.  This should only
	 * occur because of an incorrect entry in /etc/gateways.
	 */
	if (install && (rt->rt_state & (RTS_INTERNAL | RTS_EXTERNAL)) == 0 &&
	    ioctl(s, SIOCADDRT, (char *)&rt->rt_rt) < 0) {
		perror("SIOCADDRT");
		if (errno == ENETUNREACH) {
			TRACE_ACTION(DELETE, rt);
			remque(rt);
			free((char *)rt);
		}
	}
}

rtchange(rt, gate, metric)
	struct rt_entry *rt;
	struct sockaddr *gate;
	short metric;
{
	int doioctl = 0, metricchanged = 0, delete = 0;
	struct rtentry oldroute;

	if (!equal(&rt->rt_router, gate) && (rt->rt_state & RTS_INTERNAL) == 0)
		doioctl++;
	if (metric != rt->rt_metric) {
		metricchanged++;
		if (metric == HOPCNT_INFINITY)
			delete++;
	}
	if (doioctl || metricchanged) {
		TRACE_ACTION(CHANGE FROM, rt);
		if ((rt->rt_state & RTS_INTERFACE) &&
		    metric > rt->rt_ifp->int_metric) {
			rt->rt_state &= ~RTS_INTERFACE;
			rt->rt_flags |= RTF_GATEWAY;
			syslog(LOG_ERR,
				"changing route from interface %s (timed out)",
				rt->rt_ifp->int_name);
		}
		if (doioctl || delete) {
			oldroute = rt->rt_rt;
			rt->rt_router = *gate;
			rt->rt_ifp = if_ifwithdstaddr(&rt->rt_router);
			if (rt->rt_ifp == 0)
				rt->rt_ifp = if_ifwithnet(&rt->rt_router);
		}
		rt->rt_metric = metric;
		rt->rt_state |= RTS_CHANGED;
		TRACE_ACTION(CHANGE TO, rt);
	}
	if (doioctl && install)
		if (ioctl(s, SIOCADDRT, (char *)&rt->rt_rt) < 0)
			perror("SIOCADDRT");
	if ((doioctl || delete) && install)
		if (ioctl(s, SIOCDELRT, (char *)&oldroute) < 0)
			perror("SIOCDELRT");
}

rtdelete(rt)
	struct rt_entry *rt;
{

	if (rt->rt_state & RTS_INTERFACE)
		syslog(LOG_ERR, "deleting route to interface %s (timed out)",
			rt->rt_ifp->int_name);
	TRACE_ACTION(DELETE, rt);
	if (install && (rt->rt_state & (RTS_INTERNAL | RTS_EXTERNAL)) == 0 &&
	    ioctl(s, SIOCDELRT, (char *)&rt->rt_rt))
		perror("SIOCDELRT");
	remque(rt);
	free((char *)rt);
}

/*
 * If we have an interface to the wide, wide world,
 * add an entry for an Internet default route (wildcard) to the internal
 * tables and advertise it.  This route is not added to the kernel routes,
 * but this entry prevents us from listening to other people's defaults
 * and installing them in the kernel here.
 */
rtdefault()
{
	extern struct sockaddr inet_default;

	rtadd(&inet_default, &inet_default, 0,
		RTS_CHANGED | RTS_PASSIVE | RTS_INTERNAL);
}

rtinit()
{
	register struct rthash *rh;

	for (rh = nethash; rh < &nethash[ROUTEHASHSIZ]; rh++)
		rh->rt_forw = rh->rt_back = (struct rt_entry *)rh;
	for (rh = hosthash; rh < &hosthash[ROUTEHASHSIZ]; rh++)
		rh->rt_forw = rh->rt_back = (struct rt_entry *)rh;
}
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
b9b7b06a	7	#ifndef lint
88709531	8	static char sccsid[] = "@(#)tables.c 5.7 (Berkeley) %G%";
5ff67f98	9	#endif not lint
b9b7b06a SL	10
	11	/*
	12	* Routing Table Management Daemon
	13	*/
7fe7fe74	14	#include "defs.h"
b9b7b06a SL	15	#include <sys/ioctl.h>
b9b7b06a SL	16	#include <errno.h>
69b7ef61	17	#include <syslog.h>
b9b7b06a SL	18
	19	#ifndef DEBUG
	20	#define DEBUG 0
	21	#endif
	22
	23	int install = !DEBUG; /* if 1 call kernel */
	24
	25	/*
	26	* Lookup dst in the tables for an exact match.
	27	*/
	28	struct rt_entry *
	29	rtlookup(dst)
	30	struct sockaddr *dst;
	31	{
	32	register struct rt_entry *rt;
	33	register struct rthash *rh;
d5568f13	34	register u_int hash;
b9b7b06a SL	35	struct afhash h;
	36	int doinghost = 1;
	37
17fe297f	38	if (dst->sa_family >= af_max)
b9b7b06a SL	39	return (0);
	40	(*afswitch[dst->sa_family].af_hash)(dst, &h);
	41	hash = h.afh_hosthash;
49139b80	42	rh = &hosthash[hash & ROUTEHASHMASK];
b9b7b06a SL	43	again:
	44	for (rt = rh->rt_forw; rt != (struct rt_entry *)rh; rt = rt->rt_forw) {
	45	if (rt->rt_hash != hash)
	46	continue;
	47	if (equal(&rt->rt_dst, dst))
	48	return (rt);
	49	}
	50	if (doinghost) {
	51	doinghost = 0;
	52	hash = h.afh_nethash;
49139b80	53	rh = &nethash[hash & ROUTEHASHMASK];
b9b7b06a SL	54	goto again;
	55	}
	56	return (0);
	57	}
	58
	59	/*
	60	* Find a route to dst as the kernel would.
	61	*/
	62	struct rt_entry *
	63	rtfind(dst)
	64	struct sockaddr *dst;
	65	{
	66	register struct rt_entry *rt;
	67	register struct rthash *rh;
d5568f13	68	register u_int hash;
b9b7b06a SL	69	struct afhash h;
	70	int af = dst->sa_family;
	71	int doinghost = 1, (*match)();
	72
17fe297f	73	if (af >= af_max)
b9b7b06a SL	74	return (0);
	75	(*afswitch[af].af_hash)(dst, &h);
	76	hash = h.afh_hosthash;
49139b80	77	rh = &hosthash[hash & ROUTEHASHMASK];
b9b7b06a SL	78
	79	again:
	80	for (rt = rh->rt_forw; rt != (struct rt_entry *)rh; rt = rt->rt_forw) {
	81	if (rt->rt_hash != hash)
	82	continue;
	83	if (doinghost) {
	84	if (equal(&rt->rt_dst, dst))
	85	return (rt);
	86	} else {
	87	if (rt->rt_dst.sa_family == af &&
	88	(*match)(&rt->rt_dst, dst))
	89	return (rt);
	90	}
	91	}
	92	if (doinghost) {
	93	doinghost = 0;
	94	hash = h.afh_nethash;
49139b80	95	rh = &nethash[hash & ROUTEHASHMASK];
b9b7b06a SL	96	match = afswitch[af].af_netmatch;
	97	goto again;
	98	}
	99	return (0);
	100	}
	101
	102	rtadd(dst, gate, metric, state)
	103	struct sockaddr dst, gate;
	104	int metric, state;
	105	{
	106	struct afhash h;
	107	register struct rt_entry *rt;
	108	struct rthash *rh;
d5568f13 MK	109	int af = dst->sa_family, flags;
d5568f13 MK	110	u_int hash;
b9b7b06a	111
17fe297f	112	if (af >= af_max)
b9b7b06a SL	113	return;
b9b7b06a SL	114	(*afswitch[af].af_hash)(dst, &h);
4fad5a6e MK	115	flags = (*afswitch[af].af_rtflags)(dst);
	116	/*
	117	* Subnet flag isn't visible to kernel, move to state. XXX
	118	*/
	119	if (flags & RTF_SUBNET) {
	120	state \|= RTS_SUBNET;
	121	flags &= ~RTF_SUBNET;
	122	}
b9b7b06a SL	123	if (flags & RTF_HOST) {
b9b7b06a SL	124	hash = h.afh_hosthash;
49139b80	125	rh = &hosthash[hash & ROUTEHASHMASK];
b9b7b06a SL	126	} else {
b9b7b06a SL	127	hash = h.afh_nethash;
49139b80	128	rh = &nethash[hash & ROUTEHASHMASK];
b9b7b06a SL	129	}
	130	rt = (struct rt_entry )malloc(sizeof (rt));
	131	if (rt == 0)
	132	return;
	133	rt->rt_hash = hash;
	134	rt->rt_dst = *dst;
	135	rt->rt_router = *gate;
b9b7b06a SL	136	rt->rt_timer = 0;
	137	rt->rt_flags = RTF_UP \| flags;
	138	rt->rt_state = state \| RTS_CHANGED;
4fad5a6e MK	139	rt->rt_ifp = if_ifwithdstaddr(&rt->rt_router);
	140	if (rt->rt_ifp == 0)
	141	rt->rt_ifp = if_ifwithnet(&rt->rt_router);
88709531 MK	142	if (rt->rt_ifp == 0) {
	143	if (dst->sa_family < af_max && gate->sa_family < af_max)
	144	syslog(LOG_ERR,
	145	"route to net/host %s goes through unreachable gateway %s\n",
	146	(*afswitch[dst->sa_family].af_format)(dst),
	147	(*afswitch[gate->sa_family].af_format)(gate));
	148	free((char *)rt);
	149	return;
	150	}
	151	if ((state & RTS_INTERFACE) == 0)
b9b7b06a	152	rt->rt_flags \|= RTF_GATEWAY;
88709531 MK	153	/*
	154	* Set rt_ifmetric to the amount by which we
	155	* increment the route when sending it to others.
	156	*/
	157	if (state & RTS_INTERFACE) {
	158	rt->rt_metric = 0;
	159	rt->rt_ifmetric = metric + 1;
	160	} else {
	161	rt->rt_metric = metric;
	162	rt->rt_ifmetric = rt->rt_ifp->int_metric + 1;
	163	}
b9b7b06a SL	164	insque(rt, rh);
b9b7b06a SL	165	TRACE_ACTION(ADD, rt);
a8d9e287 SL	166	/*
	167	* If the ioctl fails because the gateway is unreachable
	168	* from this host, discard the entry. This should only
	169	* occur because of an incorrect entry in /etc/gateways.
	170	*/
4fad5a6e MK	171	if (install && (rt->rt_state & (RTS_INTERNAL \| RTS_EXTERNAL)) == 0 &&
4fad5a6e MK	172	ioctl(s, SIOCADDRT, (char *)&rt->rt_rt) < 0) {
b9b7b06a	173	perror("SIOCADDRT");
a8d9e287 SL	174	if (errno == ENETUNREACH) {
	175	TRACE_ACTION(DELETE, rt);
	176	remque(rt);
	177	free((char *)rt);
	178	}
	179	}
b9b7b06a SL	180	}
	181
	182	rtchange(rt, gate, metric)
	183	struct rt_entry *rt;
	184	struct sockaddr *gate;
	185	short metric;
	186	{
eb39c032	187	int doioctl = 0, metricchanged = 0, delete = 0;
b9b7b06a SL	188	struct rtentry oldroute;
b9b7b06a SL	189
4fad5a6e	190	if (!equal(&rt->rt_router, gate) && (rt->rt_state & RTS_INTERNAL) == 0)
b9b7b06a	191	doioctl++;
eb39c032	192	if (metric != rt->rt_metric) {
b9b7b06a	193	metricchanged++;
eb39c032 MK	194	if (metric == HOPCNT_INFINITY)
	195	delete++;
	196	}
b9b7b06a	197	if (doioctl \|\| metricchanged) {
b7e4f8be	198	TRACE_ACTION(CHANGE FROM, rt);
88709531 MK	199	if ((rt->rt_state & RTS_INTERFACE) &&
88709531 MK	200	metric > rt->rt_ifp->int_metric) {
aa7d0b61	201	rt->rt_state &= ~RTS_INTERFACE;
88709531	202	rt->rt_flags \|= RTF_GATEWAY;
aa7d0b61 MK	203	syslog(LOG_ERR,
	204	"changing route from interface %s (timed out)",
	205	rt->rt_ifp->int_name);
	206	}
88709531	207	if (doioctl \|\| delete) {
b7e4f8be MK	208	oldroute = rt->rt_rt;
b7e4f8be MK	209	rt->rt_router = *gate;
4fad5a6e MK	210	rt->rt_ifp = if_ifwithdstaddr(&rt->rt_router);
	211	if (rt->rt_ifp == 0)
	212	rt->rt_ifp = if_ifwithnet(&rt->rt_router);
b7e4f8be MK	213	}
b7e4f8be MK	214	rt->rt_metric = metric;
b9b7b06a	215	rt->rt_state \|= RTS_CHANGED;
b7e4f8be	216	TRACE_ACTION(CHANGE TO, rt);
b9b7b06a	217	}
eb39c032	218	if (doioctl && install)
b7e4f8be MK	219	if (ioctl(s, SIOCADDRT, (char *)&rt->rt_rt) < 0)
b7e4f8be MK	220	perror("SIOCADDRT");
eb39c032	221	if ((doioctl \|\| delete) && install)
b7e4f8be MK	222	if (ioctl(s, SIOCDELRT, (char *)&oldroute) < 0)
b7e4f8be MK	223	perror("SIOCDELRT");
b9b7b06a SL	224	}
	225
	226	rtdelete(rt)
	227	struct rt_entry *rt;
	228	{
a8d9e287	229
69b7ef61 MK	230	if (rt->rt_state & RTS_INTERFACE)
	231	syslog(LOG_ERR, "deleting route to interface %s (timed out)",
	232	rt->rt_ifp->int_name);
b9b7b06a	233	TRACE_ACTION(DELETE, rt);
b1d43e6c	234	if (install && (rt->rt_state & (RTS_INTERNAL \| RTS_EXTERNAL)) == 0 &&
4fad5a6e	235	ioctl(s, SIOCDELRT, (char *)&rt->rt_rt))
b9b7b06a SL	236	perror("SIOCDELRT");
	237	remque(rt);
	238	free((char *)rt);
	239	}
	240
ad34083f MK	241	/*
	242	* If we have an interface to the wide, wide world,
	243	* add an entry for an Internet default route (wildcard) to the internal
	244	* tables and advertise it. This route is not added to the kernel routes,
	245	* but this entry prevents us from listening to other people's defaults
	246	* and installing them in the kernel here.
	247	*/
	248	rtdefault()
	249	{
ad34083f MK	250	extern struct sockaddr inet_default;
ad34083f MK	251
4fad5a6e MK	252	rtadd(&inet_default, &inet_default, 0,
4fad5a6e MK	253	RTS_CHANGED \| RTS_PASSIVE \| RTS_INTERNAL);
ad34083f MK	254	}
ad34083f MK	255
b9b7b06a SL	256	rtinit()
	257	{
	258	register struct rthash *rh;
	259
	260	for (rh = nethash; rh < &nethash[ROUTEHASHSIZ]; rh++)
	261	rh->rt_forw = rh->rt_back = (struct rt_entry *)rh;
	262	for (rh = hosthash; rh < &hosthash[ROUTEHASHSIZ]; rh++)
	263	rh->rt_forw = rh->rt_back = (struct rt_entry *)rh;
	264	}