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

/*
 * Copyright (c) 1983, 1988 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that this notice is preserved and that due credit is given
 * to the University of California at Berkeley. The name of the University
 * may not be used to endorse or promote products derived from this
 * software without specific prior written permission. This software
 * is provided ``as is'' without express or implied warranty.
 */

#ifndef lint
static char sccsid[] = "@(#)tables.c	5.13 (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

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
	 */
	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 ((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;
	struct rtentry oldroute;

	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 (!equal(&rt->rt_router, gate)) {
			add++;
			if (rt->rt_metric != HOPCNT_INFINITY)
				delete++;
		} else if (metric == HOPCNT_INFINITY)
			delete++;
		else if (rt->rt_metric == HOPCNT_INFINITY)
			add++;
	}
	if (!equal(&rt->rt_router, gate)) {
		TRACE_ACTION("CHANGE FROM ", rt);
	} else if (metric != rt->rt_metric)
		TRACE_NEWMETRIC(rt, metric);
	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 (add)
		TRACE_ACTION("CHANGE TO   ", rt);
	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");
}

rtdelete(rt)
	struct rt_entry *rt;
{

	TRACE_ACTION("DELETE", rt);
	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(s)
	int s;
{
	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(s);
}

/*
 * 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.
	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	*/
5ff67f98 DF	12
b9b7b06a	13	#ifndef lint
09b9aef2	14	static char sccsid[] = "@(#)tables.c 5.13 (Berkeley) %G%";
0eb85d71	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>
b9b7b06a SL	22	#include <errno.h>
9c2cb70b	23	#include <sys/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
9c2cb70b MK	65	struct sockaddr wildcard; /* zero valued cookie for wildcard searches */
9c2cb70b MK	66
b9b7b06a SL	67	/*
	68	* Find a route to dst as the kernel would.
	69	*/
	70	struct rt_entry *
	71	rtfind(dst)
	72	struct sockaddr *dst;
	73	{
	74	register struct rt_entry *rt;
	75	register struct rthash *rh;
d5568f13	76	register u_int hash;
b9b7b06a SL	77	struct afhash h;
	78	int af = dst->sa_family;
	79	int doinghost = 1, (*match)();
	80
17fe297f	81	if (af >= af_max)
b9b7b06a SL	82	return (0);
	83	(*afswitch[af].af_hash)(dst, &h);
	84	hash = h.afh_hosthash;
49139b80	85	rh = &hosthash[hash & ROUTEHASHMASK];
b9b7b06a SL	86
	87	again:
	88	for (rt = rh->rt_forw; rt != (struct rt_entry *)rh; rt = rt->rt_forw) {
	89	if (rt->rt_hash != hash)
	90	continue;
	91	if (doinghost) {
	92	if (equal(&rt->rt_dst, dst))
	93	return (rt);
	94	} else {
	95	if (rt->rt_dst.sa_family == af &&
	96	(*match)(&rt->rt_dst, dst))
	97	return (rt);
	98	}
	99	}
	100	if (doinghost) {
	101	doinghost = 0;
	102	hash = h.afh_nethash;
49139b80	103	rh = &nethash[hash & ROUTEHASHMASK];
b9b7b06a SL	104	match = afswitch[af].af_netmatch;
	105	goto again;
	106	}
9c2cb70b MK	107	#ifdef notyet
	108	/*
	109	* Check for wildcard gateway, by convention network 0.
	110	*/
	111	if (dst != &wildcard) {
	112	dst = &wildcard, hash = 0;
	113	goto again;
	114	}
	115	#endif
b9b7b06a SL	116	return (0);
	117	}
	118
	119	rtadd(dst, gate, metric, state)
	120	struct sockaddr dst, gate;
	121	int metric, state;
	122	{
	123	struct afhash h;
	124	register struct rt_entry *rt;
	125	struct rthash *rh;
7892134c	126	int af = dst->sa_family, flags;
d5568f13	127	u_int hash;
b9b7b06a	128
17fe297f	129	if (af >= af_max)
b9b7b06a SL	130	return;
b9b7b06a SL	131	(*afswitch[af].af_hash)(dst, &h);
4fad5a6e MK	132	flags = (*afswitch[af].af_rtflags)(dst);
	133	/*
	134	* Subnet flag isn't visible to kernel, move to state. XXX
	135	*/
	136	if (flags & RTF_SUBNET) {
	137	state \|= RTS_SUBNET;
	138	flags &= ~RTF_SUBNET;
	139	}
b9b7b06a SL	140	if (flags & RTF_HOST) {
b9b7b06a SL	141	hash = h.afh_hosthash;
49139b80	142	rh = &hosthash[hash & ROUTEHASHMASK];
b9b7b06a SL	143	} else {
b9b7b06a SL	144	hash = h.afh_nethash;
49139b80	145	rh = &nethash[hash & ROUTEHASHMASK];
b9b7b06a SL	146	}
	147	rt = (struct rt_entry )malloc(sizeof (rt));
	148	if (rt == 0)
	149	return;
	150	rt->rt_hash = hash;
	151	rt->rt_dst = *dst;
	152	rt->rt_router = *gate;
b9b7b06a SL	153	rt->rt_timer = 0;
	154	rt->rt_flags = RTF_UP \| flags;
	155	rt->rt_state = state \| RTS_CHANGED;
4fad5a6e MK	156	rt->rt_ifp = if_ifwithdstaddr(&rt->rt_router);
	157	if (rt->rt_ifp == 0)
	158	rt->rt_ifp = if_ifwithnet(&rt->rt_router);
88709531	159	if ((state & RTS_INTERFACE) == 0)
b9b7b06a	160	rt->rt_flags \|= RTF_GATEWAY;
7892134c	161	rt->rt_metric = metric;
b9b7b06a	162	insque(rt, rh);
9c2cb70b	163	TRACE_ACTION("ADD", rt);
a8d9e287 SL	164	/*
	165	* If the ioctl fails because the gateway is unreachable
	166	* from this host, discard the entry. This should only
	167	* occur because of an incorrect entry in /etc/gateways.
	168	*/
4fad5a6e MK	169	if (install && (rt->rt_state & (RTS_INTERNAL \| RTS_EXTERNAL)) == 0 &&
4fad5a6e MK	170	ioctl(s, SIOCADDRT, (char *)&rt->rt_rt) < 0) {
7892134c	171	if (errno != EEXIST && gate->sa_family < af_max)
c766cf31 MK	172	syslog(LOG_ERR,
	173	"adding route to net/host %s through gateway %s: %m\n",
	174	(*afswitch[dst->sa_family].af_format)(dst),
	175	(*afswitch[gate->sa_family].af_format)(gate));
b9b7b06a	176	perror("SIOCADDRT");
a8d9e287	177	if (errno == ENETUNREACH) {
9c2cb70b	178	TRACE_ACTION("DELETE", rt);
a8d9e287 SL	179	remque(rt);
	180	free((char *)rt);
	181	}
	182	}
b9b7b06a SL	183	}
	184
	185	rtchange(rt, gate, metric)
	186	struct rt_entry *rt;
	187	struct sockaddr *gate;
	188	short metric;
	189	{
9c2cb70b	190	int add = 0, delete = 0;
b9b7b06a SL	191	struct rtentry oldroute;
b9b7b06a SL	192
7892134c MK	193	if ((rt->rt_state & RTS_INTERNAL) == 0) {
	194	/*
	195	* If changing to different router, we need to add
	196	* new route and delete old one if in the kernel.
	197	* If the router is the same, we need to delete
	198	* the route if has become unreachable, or re-add
	199	* it if it had been unreachable.
	200	*/
	201	if (!equal(&rt->rt_router, gate)) {
	202	add++;
	203	if (rt->rt_metric != HOPCNT_INFINITY)
	204	delete++;
	205	} else if (metric == HOPCNT_INFINITY)
eb39c032	206	delete++;
7892134c MK	207	else if (rt->rt_metric == HOPCNT_INFINITY)
7892134c MK	208	add++;
eb39c032	209	}
9c2cb70b MK	210	if (!equal(&rt->rt_router, gate)) {
	211	TRACE_ACTION("CHANGE FROM ", rt);
	212	} else if (metric != rt->rt_metric)
	213	TRACE_NEWMETRIC(rt, metric);
	214	if (delete)
	215	oldroute = rt->rt_rt;
7892134c MK	216	if ((rt->rt_state & RTS_INTERFACE) && delete) {
7892134c MK	217	rt->rt_state &= ~RTS_INTERFACE;
9c2cb70b MK	218	rt->rt_flags \|= RTF_GATEWAY;
	219	if (metric > rt->rt_metric && delete)
	220	syslog(LOG_ERR, "%s route to interface %s (timed out)",
	221	add? "changing" : "deleting",
	222	rt->rt_ifp->int_name);
b9b7b06a	223	}
7892134c MK	224	if (add) {
	225	rt->rt_router = *gate;
	226	rt->rt_ifp = if_ifwithdstaddr(&rt->rt_router);
	227	if (rt->rt_ifp == 0)
	228	rt->rt_ifp = if_ifwithnet(&rt->rt_router);
	229	}
	230	rt->rt_metric = metric;
	231	rt->rt_state \|= RTS_CHANGED;
9c2cb70b MK	232	if (add)
9c2cb70b MK	233	TRACE_ACTION("CHANGE TO ", rt);
7892134c	234	if (add && install)
b7e4f8be MK	235	if (ioctl(s, SIOCADDRT, (char *)&rt->rt_rt) < 0)
b7e4f8be MK	236	perror("SIOCADDRT");
7892134c	237	if (delete && install)
b7e4f8be MK	238	if (ioctl(s, SIOCDELRT, (char *)&oldroute) < 0)
b7e4f8be MK	239	perror("SIOCDELRT");
b9b7b06a SL	240	}
	241
	242	rtdelete(rt)
	243	struct rt_entry *rt;
	244	{
a8d9e287	245
9c2cb70b MK	246	TRACE_ACTION("DELETE", rt);
	247	if (rt->rt_metric < HOPCNT_INFINITY) {
	248	if ((rt->rt_state & (RTS_INTERFACE\|RTS_INTERNAL)) == RTS_INTERFACE)
	249	syslog(LOG_ERR,
	250	"deleting route to interface %s? (timed out?)",
	251	rt->rt_ifp->int_name);
	252	if (install &&
	253	(rt->rt_state & (RTS_INTERNAL \| RTS_EXTERNAL)) == 0 &&
	254	ioctl(s, SIOCDELRT, (char *)&rt->rt_rt))
	255	perror("SIOCDELRT");
	256	}
b9b7b06a SL	257	remque(rt);
	258	free((char *)rt);
	259	}
	260
7892134c MK	261	rtdeleteall(s)
	262	int s;
	263	{
	264	register struct rthash *rh;
	265	register struct rt_entry *rt;
	266	struct rthash *base = hosthash;
	267	int doinghost = 1;
	268
	269	again:
	270	for (rh = base; rh < &base[ROUTEHASHSIZ]; rh++) {
	271	rt = rh->rt_forw;
	272	for (; rt != (struct rt_entry *)rh; rt = rt->rt_forw) {
9c2cb70b MK	273	if (rt->rt_state & RTS_INTERFACE \|\|
9c2cb70b MK	274	rt->rt_metric >= HOPCNT_INFINITY)
7892134c	275	continue;
9c2cb70b	276	TRACE_ACTION("DELETE", rt);
7892134c MK	277	if ((rt->rt_state & (RTS_INTERNAL\|RTS_EXTERNAL)) == 0 &&
	278	ioctl(s, SIOCDELRT, (char *)&rt->rt_rt))
	279	perror("SIOCDELRT");
	280	}
	281	}
	282	if (doinghost) {
	283	doinghost = 0;
	284	base = nethash;
	285	goto again;
	286	}
9c2cb70b	287	exit(s);
7892134c MK	288	}
7892134c MK	289
ad34083f MK	290	/*
	291	* If we have an interface to the wide, wide world,
	292	* add an entry for an Internet default route (wildcard) to the internal
	293	* tables and advertise it. This route is not added to the kernel routes,
	294	* but this entry prevents us from listening to other people's defaults
	295	* and installing them in the kernel here.
	296	*/
	297	rtdefault()
	298	{
ad34083f MK	299	extern struct sockaddr inet_default;
ad34083f MK	300
09b9aef2	301	rtadd(&inet_default, &inet_default, 1,
4fad5a6e	302	RTS_CHANGED \| RTS_PASSIVE \| RTS_INTERNAL);
ad34083f MK	303	}
ad34083f MK	304
b9b7b06a SL	305	rtinit()
	306	{
	307	register struct rthash *rh;
	308
	309	for (rh = nethash; rh < &nethash[ROUTEHASHSIZ]; rh++)
	310	rh->rt_forw = rh->rt_back = (struct rt_entry *)rh;
	311	for (rh = hosthash; rh < &hosthash[ROUTEHASHSIZ]; rh++)
	312	rh->rt_forw = rh->rt_back = (struct rt_entry *)rh;
	313	}