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

/*
 * Copyright (c) 1983, 1988 Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 */

#ifndef lint
static char sccsid[] = "@(#)tables.c	5.17 (Berkeley) %G%";
#endif /* not lint */

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

#ifndef DEBUG
#define	DEBUG	0
#endif

#ifdef RTM_ADD
#define FIXLEN(s) {if ((s)->sa_len == 0) (s)->sa_len = sizeof *(s);}
#else
#define FIXLEN(s) { }
#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);
}

struct sockaddr wildcard;	/* zero valued cookie for wildcard searches */

/*
 * 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;
	}
#ifdef notyet
	/*
	 * Check for wildcard gateway, by convention network 0.
	 */
	if (dst != &wildcard) {
		dst = &wildcard, hash = 0;
		goto again;
	}
#endif
	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
	 */
	FIXLEN(dst);
	FIXLEN(gate);
	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_dst);
	if (rt->rt_ifp == 0)
		rt->rt_ifp = if_ifwithnet(&rt->rt_router);
	if ((state & RTS_INTERFACE) == 0)
		rt->rt_flags |= RTF_GATEWAY;
	rt->rt_metric = metric;
	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) {
		if (errno != EEXIST && gate->sa_family < af_max)
			syslog(LOG_ERR,
			"adding route to net/host %s through gateway %s: %m\n",
			   (*afswitch[dst->sa_family].af_format)(dst),
			   (*afswitch[gate->sa_family].af_format)(gate));
		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 add = 0, delete = 0, newgateway = 0;
	struct rtentry oldroute;

	FIXLEN(gate);
	FIXLEN(&(rt->rt_router));
	FIXLEN(&(rt->rt_dst));
	if (!equal(&rt->rt_router, gate)) {
		newgateway++;
		TRACE_ACTION("CHANGE FROM ", rt);
	} else if (metric != rt->rt_metric)
		TRACE_NEWMETRIC(rt, metric);
	if ((rt->rt_state & RTS_INTERNAL) == 0) {
		/*
		 * If changing to different router, we need to add
		 * new route and delete old one if in the kernel.
		 * If the router is the same, we need to delete
		 * the route if has become unreachable, or re-add
		 * it if it had been unreachable.
		 */
		if (newgateway) {
			add++;
			if (rt->rt_metric != HOPCNT_INFINITY)
				delete++;
		} else if (metric == HOPCNT_INFINITY)
			delete++;
		else if (rt->rt_metric == HOPCNT_INFINITY)
			add++;
	}
	if (delete)
		oldroute = rt->rt_rt;
	if ((rt->rt_state & RTS_INTERFACE) && delete) {
		rt->rt_state &= ~RTS_INTERFACE;
		rt->rt_flags |= RTF_GATEWAY;
		if (metric > rt->rt_metric && delete)
			syslog(LOG_ERR, "%s route to interface %s (timed out)",
			    add? "changing" : "deleting",
			    rt->rt_ifp->int_name);
	}
	if (add) {
		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;
	if (newgateway)
		TRACE_ACTION("CHANGE TO   ", rt);
#ifndef RTM_ADD
	if (add && install)
		if (ioctl(s, SIOCADDRT, (char *)&rt->rt_rt) < 0)
			perror("SIOCADDRT");
	if (delete && install)
		if (ioctl(s, SIOCDELRT, (char *)&oldroute) < 0)
			perror("SIOCDELRT");
#else
	if (delete && install)
		if (ioctl(s, SIOCDELRT, (char *)&oldroute) < 0)
			perror("SIOCDELRT");
	if (add && install) {
		if (ioctl(s, SIOCADDRT, (char *)&rt->rt_rt) < 0)
			perror("SIOCADDRT");
	}
#endif
}

rtdelete(rt)
	struct rt_entry *rt;
{

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

rtdeleteall(sig)
	int sig;
{
	register struct rthash *rh;
	register struct rt_entry *rt;
	struct rthash *base = hosthash;
	int doinghost = 1;

again:
	for (rh = base; rh < &base[ROUTEHASHSIZ]; rh++) {
		rt = rh->rt_forw;
		for (; rt != (struct rt_entry *)rh; rt = rt->rt_forw) {
			if (rt->rt_state & RTS_INTERFACE ||
			    rt->rt_metric >= HOPCNT_INFINITY)
				continue;
			TRACE_ACTION("DELETE", rt);
			if ((rt->rt_state & (RTS_INTERNAL|RTS_EXTERNAL)) == 0 &&
			    ioctl(s, SIOCDELRT, (char *)&rt->rt_rt))
				perror("SIOCDELRT");
		}
	}
	if (doinghost) {
		doinghost = 0;
		base = nethash;
		goto again;
	}
	exit(sig);
}

/*
 * 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, 1,
		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	1	/*
9c2cb70b	2	* Copyright (c) 1983, 1988 Regents of the University of California.
0eb85d71 KB	3	* All rights reserved.
0eb85d71 KB	4	*
d60d530a	5	* %sccs.include.redist.c%
5ff67f98 DF	6	*/
5ff67f98 DF	7
b9b7b06a	8	#ifndef lint
d60d530a	9	static char sccsid[] = "@(#)tables.c 5.17 (Berkeley) %G%";
0eb85d71	10	#endif /* not lint */
b9b7b06a SL	11
	12	/*
	13	* Routing Table Management Daemon
	14	*/
7fe7fe74	15	#include "defs.h"
b9b7b06a SL	16	#include <sys/ioctl.h>
b9b7b06a SL	17	#include <errno.h>
9c2cb70b	18	#include <sys/syslog.h>
b9b7b06a SL	19
	20	#ifndef DEBUG
	21	#define DEBUG 0
	22	#endif
	23
a33a5c17 KS	24	#ifdef RTM_ADD
	25	#define FIXLEN(s) {if ((s)->sa_len == 0) (s)->sa_len = sizeof *(s);}
	26	#else
	27	#define FIXLEN(s) { }
	28	#endif
	29
b9b7b06a SL	30	int install = !DEBUG; /* if 1 call kernel */
	31
	32	/*
	33	* Lookup dst in the tables for an exact match.
	34	*/
	35	struct rt_entry *
	36	rtlookup(dst)
	37	struct sockaddr *dst;
	38	{
	39	register struct rt_entry *rt;
	40	register struct rthash *rh;
d5568f13	41	register u_int hash;
b9b7b06a SL	42	struct afhash h;
	43	int doinghost = 1;
	44
17fe297f	45	if (dst->sa_family >= af_max)
b9b7b06a SL	46	return (0);
	47	(*afswitch[dst->sa_family].af_hash)(dst, &h);
	48	hash = h.afh_hosthash;
49139b80	49	rh = &hosthash[hash & ROUTEHASHMASK];
b9b7b06a SL	50	again:
	51	for (rt = rh->rt_forw; rt != (struct rt_entry *)rh; rt = rt->rt_forw) {
	52	if (rt->rt_hash != hash)
	53	continue;
	54	if (equal(&rt->rt_dst, dst))
	55	return (rt);
	56	}
	57	if (doinghost) {
	58	doinghost = 0;
	59	hash = h.afh_nethash;
49139b80	60	rh = &nethash[hash & ROUTEHASHMASK];
b9b7b06a SL	61	goto again;
	62	}
	63	return (0);
	64	}
	65
9c2cb70b MK	66	struct sockaddr wildcard; /* zero valued cookie for wildcard searches */
9c2cb70b MK	67
b9b7b06a SL	68	/*
	69	* Find a route to dst as the kernel would.
	70	*/
	71	struct rt_entry *
	72	rtfind(dst)
	73	struct sockaddr *dst;
	74	{
	75	register struct rt_entry *rt;
	76	register struct rthash *rh;
d5568f13	77	register u_int hash;
b9b7b06a SL	78	struct afhash h;
	79	int af = dst->sa_family;
	80	int doinghost = 1, (*match)();
	81
17fe297f	82	if (af >= af_max)
b9b7b06a SL	83	return (0);
	84	(*afswitch[af].af_hash)(dst, &h);
	85	hash = h.afh_hosthash;
49139b80	86	rh = &hosthash[hash & ROUTEHASHMASK];
b9b7b06a SL	87
	88	again:
	89	for (rt = rh->rt_forw; rt != (struct rt_entry *)rh; rt = rt->rt_forw) {
	90	if (rt->rt_hash != hash)
	91	continue;
	92	if (doinghost) {
	93	if (equal(&rt->rt_dst, dst))
	94	return (rt);
	95	} else {
	96	if (rt->rt_dst.sa_family == af &&
	97	(*match)(&rt->rt_dst, dst))
	98	return (rt);
	99	}
	100	}
	101	if (doinghost) {
	102	doinghost = 0;
	103	hash = h.afh_nethash;
49139b80	104	rh = &nethash[hash & ROUTEHASHMASK];
b9b7b06a SL	105	match = afswitch[af].af_netmatch;
	106	goto again;
	107	}
9c2cb70b MK	108	#ifdef notyet
	109	/*
	110	* Check for wildcard gateway, by convention network 0.
	111	*/
	112	if (dst != &wildcard) {
	113	dst = &wildcard, hash = 0;
	114	goto again;
	115	}
	116	#endif
b9b7b06a SL	117	return (0);
	118	}
	119
	120	rtadd(dst, gate, metric, state)
	121	struct sockaddr dst, gate;
	122	int metric, state;
	123	{
	124	struct afhash h;
	125	register struct rt_entry *rt;
	126	struct rthash *rh;
7892134c	127	int af = dst->sa_family, flags;
d5568f13	128	u_int hash;
b9b7b06a	129
17fe297f	130	if (af >= af_max)
b9b7b06a SL	131	return;
b9b7b06a SL	132	(*afswitch[af].af_hash)(dst, &h);
4fad5a6e MK	133	flags = (*afswitch[af].af_rtflags)(dst);
	134	/*
	135	* Subnet flag isn't visible to kernel, move to state. XXX
	136	*/
a33a5c17 KS	137	FIXLEN(dst);
a33a5c17 KS	138	FIXLEN(gate);
4fad5a6e MK	139	if (flags & RTF_SUBNET) {
	140	state \|= RTS_SUBNET;
	141	flags &= ~RTF_SUBNET;
	142	}
b9b7b06a SL	143	if (flags & RTF_HOST) {
b9b7b06a SL	144	hash = h.afh_hosthash;
49139b80	145	rh = &hosthash[hash & ROUTEHASHMASK];
b9b7b06a SL	146	} else {
b9b7b06a SL	147	hash = h.afh_nethash;
49139b80	148	rh = &nethash[hash & ROUTEHASHMASK];
b9b7b06a SL	149	}
	150	rt = (struct rt_entry )malloc(sizeof (rt));
	151	if (rt == 0)
	152	return;
	153	rt->rt_hash = hash;
	154	rt->rt_dst = *dst;
	155	rt->rt_router = *gate;
b9b7b06a SL	156	rt->rt_timer = 0;
	157	rt->rt_flags = RTF_UP \| flags;
	158	rt->rt_state = state \| RTS_CHANGED;
a33a5c17	159	rt->rt_ifp = if_ifwithdstaddr(&rt->rt_dst);
4fad5a6e MK	160	if (rt->rt_ifp == 0)
4fad5a6e MK	161	rt->rt_ifp = if_ifwithnet(&rt->rt_router);
88709531	162	if ((state & RTS_INTERFACE) == 0)
b9b7b06a	163	rt->rt_flags \|= RTF_GATEWAY;
7892134c	164	rt->rt_metric = metric;
b9b7b06a	165	insque(rt, rh);
9c2cb70b	166	TRACE_ACTION("ADD", rt);
a8d9e287 SL	167	/*
	168	* If the ioctl fails because the gateway is unreachable
	169	* from this host, discard the entry. This should only
	170	* occur because of an incorrect entry in /etc/gateways.
	171	*/
4fad5a6e MK	172	if (install && (rt->rt_state & (RTS_INTERNAL \| RTS_EXTERNAL)) == 0 &&
4fad5a6e MK	173	ioctl(s, SIOCADDRT, (char *)&rt->rt_rt) < 0) {
7892134c	174	if (errno != EEXIST && gate->sa_family < af_max)
c766cf31 MK	175	syslog(LOG_ERR,
	176	"adding route to net/host %s through gateway %s: %m\n",
	177	(*afswitch[dst->sa_family].af_format)(dst),
	178	(*afswitch[gate->sa_family].af_format)(gate));
b9b7b06a	179	perror("SIOCADDRT");
a8d9e287	180	if (errno == ENETUNREACH) {
9c2cb70b	181	TRACE_ACTION("DELETE", rt);
a8d9e287 SL	182	remque(rt);
	183	free((char *)rt);
	184	}
	185	}
b9b7b06a SL	186	}
	187
	188	rtchange(rt, gate, metric)
	189	struct rt_entry *rt;
	190	struct sockaddr *gate;
	191	short metric;
	192	{
4033c8f6	193	int add = 0, delete = 0, newgateway = 0;
b9b7b06a SL	194	struct rtentry oldroute;
b9b7b06a SL	195
a33a5c17 KS	196	FIXLEN(gate);
	197	FIXLEN(&(rt->rt_router));
	198	FIXLEN(&(rt->rt_dst));
4033c8f6 MK	199	if (!equal(&rt->rt_router, gate)) {
	200	newgateway++;
	201	TRACE_ACTION("CHANGE FROM ", rt);
	202	} else if (metric != rt->rt_metric)
	203	TRACE_NEWMETRIC(rt, metric);
7892134c MK	204	if ((rt->rt_state & RTS_INTERNAL) == 0) {
	205	/*
	206	* If changing to different router, we need to add
	207	* new route and delete old one if in the kernel.
	208	* If the router is the same, we need to delete
	209	* the route if has become unreachable, or re-add
	210	* it if it had been unreachable.
	211	*/
4033c8f6	212	if (newgateway) {
7892134c MK	213	add++;
	214	if (rt->rt_metric != HOPCNT_INFINITY)
	215	delete++;
	216	} else if (metric == HOPCNT_INFINITY)
eb39c032	217	delete++;
7892134c MK	218	else if (rt->rt_metric == HOPCNT_INFINITY)
7892134c MK	219	add++;
eb39c032	220	}
9c2cb70b MK	221	if (delete)
9c2cb70b MK	222	oldroute = rt->rt_rt;
7892134c MK	223	if ((rt->rt_state & RTS_INTERFACE) && delete) {
7892134c MK	224	rt->rt_state &= ~RTS_INTERFACE;
9c2cb70b MK	225	rt->rt_flags \|= RTF_GATEWAY;
	226	if (metric > rt->rt_metric && delete)
	227	syslog(LOG_ERR, "%s route to interface %s (timed out)",
	228	add? "changing" : "deleting",
	229	rt->rt_ifp->int_name);
b9b7b06a	230	}
7892134c MK	231	if (add) {
	232	rt->rt_router = *gate;
	233	rt->rt_ifp = if_ifwithdstaddr(&rt->rt_router);
	234	if (rt->rt_ifp == 0)
	235	rt->rt_ifp = if_ifwithnet(&rt->rt_router);
	236	}
	237	rt->rt_metric = metric;
	238	rt->rt_state \|= RTS_CHANGED;
4033c8f6	239	if (newgateway)
9c2cb70b	240	TRACE_ACTION("CHANGE TO ", rt);
a33a5c17	241	#ifndef RTM_ADD
7892134c	242	if (add && install)
b7e4f8be MK	243	if (ioctl(s, SIOCADDRT, (char *)&rt->rt_rt) < 0)
b7e4f8be MK	244	perror("SIOCADDRT");
7892134c	245	if (delete && install)
b7e4f8be MK	246	if (ioctl(s, SIOCDELRT, (char *)&oldroute) < 0)
b7e4f8be MK	247	perror("SIOCDELRT");
a33a5c17 KS	248	#else
	249	if (delete && install)
	250	if (ioctl(s, SIOCDELRT, (char *)&oldroute) < 0)
	251	perror("SIOCDELRT");
	252	if (add && install) {
	253	if (ioctl(s, SIOCADDRT, (char *)&rt->rt_rt) < 0)
	254	perror("SIOCADDRT");
	255	}
	256	#endif
b9b7b06a SL	257	}
	258
	259	rtdelete(rt)
	260	struct rt_entry *rt;
	261	{
a8d9e287	262
9c2cb70b	263	TRACE_ACTION("DELETE", rt);
a33a5c17 KS	264	FIXLEN(&(rt->rt_router));
a33a5c17 KS	265	FIXLEN(&(rt->rt_dst));
9c2cb70b MK	266	if (rt->rt_metric < HOPCNT_INFINITY) {
	267	if ((rt->rt_state & (RTS_INTERFACE\|RTS_INTERNAL)) == RTS_INTERFACE)
	268	syslog(LOG_ERR,
	269	"deleting route to interface %s? (timed out?)",
	270	rt->rt_ifp->int_name);
	271	if (install &&
	272	(rt->rt_state & (RTS_INTERNAL \| RTS_EXTERNAL)) == 0 &&
	273	ioctl(s, SIOCDELRT, (char *)&rt->rt_rt))
	274	perror("SIOCDELRT");
	275	}
b9b7b06a SL	276	remque(rt);
	277	free((char *)rt);
	278	}
	279
4033c8f6 MK	280	rtdeleteall(sig)
4033c8f6 MK	281	int sig;
7892134c MK	282	{
	283	register struct rthash *rh;
	284	register struct rt_entry *rt;
	285	struct rthash *base = hosthash;
	286	int doinghost = 1;
	287
	288	again:
	289	for (rh = base; rh < &base[ROUTEHASHSIZ]; rh++) {
	290	rt = rh->rt_forw;
	291	for (; rt != (struct rt_entry *)rh; rt = rt->rt_forw) {
9c2cb70b MK	292	if (rt->rt_state & RTS_INTERFACE \|\|
9c2cb70b MK	293	rt->rt_metric >= HOPCNT_INFINITY)
7892134c	294	continue;
9c2cb70b	295	TRACE_ACTION("DELETE", rt);
7892134c MK	296	if ((rt->rt_state & (RTS_INTERNAL\|RTS_EXTERNAL)) == 0 &&
	297	ioctl(s, SIOCDELRT, (char *)&rt->rt_rt))
	298	perror("SIOCDELRT");
	299	}
	300	}
	301	if (doinghost) {
	302	doinghost = 0;
	303	base = nethash;
	304	goto again;
	305	}
4033c8f6	306	exit(sig);
7892134c MK	307	}
7892134c MK	308
ad34083f MK	309	/*
	310	* If we have an interface to the wide, wide world,
	311	* add an entry for an Internet default route (wildcard) to the internal
	312	* tables and advertise it. This route is not added to the kernel routes,
	313	* but this entry prevents us from listening to other people's defaults
	314	* and installing them in the kernel here.
	315	*/
	316	rtdefault()
	317	{
ad34083f MK	318	extern struct sockaddr inet_default;
ad34083f MK	319
09b9aef2	320	rtadd(&inet_default, &inet_default, 1,
4fad5a6e	321	RTS_CHANGED \| RTS_PASSIVE \| RTS_INTERNAL);
ad34083f MK	322	}
ad34083f MK	323
b9b7b06a SL	324	rtinit()
	325	{
	326	register struct rthash *rh;
	327
	328	for (rh = nethash; rh < &nethash[ROUTEHASHSIZ]; rh++)
	329	rh->rt_forw = rh->rt_back = (struct rt_entry *)rh;
	330	for (rh = hosthash; rh < &hosthash[ROUTEHASHSIZ]; rh++)
	331	rh->rt_forw = rh->rt_back = (struct rt_entry *)rh;
	332	}