usr/src/sys/net/route.c

/*
 * Copyright (c) 1980, 1986, 1991, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * %sccs.include.redist.c%
 *
 *	@(#)route.c	8.1 (Berkeley) %G%
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/domain.h>
#include <sys/protosw.h>
#include <sys/ioctl.h>

#include <net/if.h>
#include <net/af.h>
#include <net/route.h>
#include <net/raw_cb.h>

#include <netinet/in.h>
#include <netinet/in_var.h>

#ifdef NS
#include <netns/ns.h>
#endif

#define	SA(p) ((struct sockaddr *)(p))

int	rttrash;		/* routes not in table but not freed */
struct	sockaddr wildcard;	/* zero valued cookie for wildcard searches */

void
rtable_init(table)
	void **table;
{
	struct domain *dom;
	for (dom = domains; dom; dom = dom->dom_next)
		if (dom->dom_rtattach)
			dom->dom_rtattach(&table[dom->dom_family],
			    dom->dom_rtoffset);
}

void
route_init()
{
	rn_init();	/* initialize all zeroes, all ones, mask table */
	rtable_init((void **)rt_tables);
}

/*
 * Packet routing routines.
 */
void
rtalloc(ro)
	register struct route *ro;
{
	if (ro->ro_rt && ro->ro_rt->rt_ifp && (ro->ro_rt->rt_flags & RTF_UP))
		return;				 /* XXX */
	ro->ro_rt = rtalloc1(&ro->ro_dst, 1);
}

struct rtentry *
rtalloc1(dst, report)
	register struct sockaddr *dst;
	int report;
{
	register struct radix_node_head *rnh = rt_tables[dst->sa_family];
	register struct rtentry *rt;
	register struct radix_node *rn;
	struct rtentry *newrt = 0;
	struct rt_addrinfo info;
	int  s = splnet(), err = 0, msgtype = RTM_MISS;

	if (rnh && (rn = rnh->rnh_matchaddr((caddr_t)dst, rnh)) &&
	    ((rn->rn_flags & RNF_ROOT) == 0)) {
		newrt = rt = (struct rtentry *)rn;
		if (report && (rt->rt_flags & RTF_CLONING)) {
			err = rtrequest(RTM_RESOLVE, dst, SA(0),
					      SA(0), 0, &newrt);
			if (err) {
				newrt = rt;
				rt->rt_refcnt++;
				goto miss;
			}
			if ((rt = newrt) && (rt->rt_flags & RTF_XRESOLVE)) {
				msgtype = RTM_RESOLVE;
				goto miss;
			}
		} else
			rt->rt_refcnt++;
	} else {
		rtstat.rts_unreach++;
	miss:	if (report) {
			bzero((caddr_t)&info, sizeof(info));
			info.rti_info[RTAX_DST] = dst;
			rt_missmsg(msgtype, &info, 0, err);
		}
	}
	splx(s);
	return (newrt);
}

void
rtfree(rt)
	register struct rtentry *rt;
{
	register struct ifaddr *ifa;

	if (rt == 0)
		panic("rtfree");
	rt->rt_refcnt--;
	if (rt->rt_refcnt <= 0 && (rt->rt_flags & RTF_UP) == 0) {
		if (rt->rt_nodes->rn_flags & (RNF_ACTIVE | RNF_ROOT))
			panic ("rtfree 2");
		rttrash--;
		if (rt->rt_refcnt < 0) {
			printf("rtfree: %x not freed (neg refs)\n", rt);
			return;
		}
		ifa = rt->rt_ifa;
		IFAFREE(ifa);
		Free(rt_key(rt));
		Free(rt);
	}
}

void
ifafree(ifa)
	register struct ifaddr *ifa;
{
	if (ifa == NULL)
		panic("ifafree");
	if (ifa->ifa_refcnt == 0)
		free(ifa, M_IFADDR);
	else
		ifa->ifa_refcnt--;
}

/*
 * Force a routing table entry to the specified
 * destination to go through the given gateway.
 * Normally called as a result of a routing redirect
 * message from the network layer.
 *
 * N.B.: must be called at splnet
 *
 */
int
rtredirect(dst, gateway, netmask, flags, src, rtp)
	struct sockaddr *dst, *gateway, *netmask, *src;
	int flags;
	struct rtentry **rtp;
{
	register struct rtentry *rt;
	int error = 0;
	short *stat = 0;
	struct rt_addrinfo info;
	struct ifaddr *ifa;

	/* verify the gateway is directly reachable */
	if ((ifa = ifa_ifwithnet(gateway)) == 0) {
		error = ENETUNREACH;
		goto out;
	}
	rt = rtalloc1(dst, 0);
	/*
	 * If the redirect isn't from our current router for this dst,
	 * it's either old or wrong.  If it redirects us to ourselves,
	 * we have a routing loop, perhaps as a result of an interface
	 * going down recently.
	 */
#define	equal(a1, a2) (bcmp((caddr_t)(a1), (caddr_t)(a2), (a1)->sa_len) == 0)
	if (!(flags & RTF_DONE) && rt &&
	     (!equal(src, rt->rt_gateway) || rt->rt_ifa != ifa))
		error = EINVAL;
	else if (ifa_ifwithaddr(gateway))
		error = EHOSTUNREACH;
	if (error)
		goto done;
	/*
	 * Create a new entry if we just got back a wildcard entry
	 * or the the lookup failed.  This is necessary for hosts
	 * which use routing redirects generated by smart gateways
	 * to dynamically build the routing tables.
	 */
	if ((rt == 0) || (rt_mask(rt) && rt_mask(rt)->sa_len < 2))
		goto create;
	/*
	 * Don't listen to the redirect if it's
	 * for a route to an interface.
	 */
	if (rt->rt_flags & RTF_GATEWAY) {
		if (((rt->rt_flags & RTF_HOST) == 0) && (flags & RTF_HOST)) {
			/*
			 * Changing from route to net => route to host.
			 * Create new route, rather than smashing route to net.
			 */
		create:
			flags |=  RTF_GATEWAY | RTF_DYNAMIC;
			error = rtrequest((int)RTM_ADD, dst, gateway,
				    netmask, flags,
				    (struct rtentry **)0);
			stat = &rtstat.rts_dynamic;
		} else {
			/*
			 * Smash the current notion of the gateway to
			 * this destination.  Should check about netmask!!!
			 */
			rt->rt_flags |= RTF_MODIFIED;
			flags |= RTF_MODIFIED;
			stat = &rtstat.rts_newgateway;
			rt_setgate(rt, rt_key(rt), gateway);
		}
	} else
		error = EHOSTUNREACH;
done:
	if (rt) {
		if (rtp && !error)
			*rtp = rt;
		else
			rtfree(rt);
	}
out:
	if (error)
		rtstat.rts_badredirect++;
	else if (stat != NULL)
		(*stat)++;
	bzero((caddr_t)&info, sizeof(info));
	info.rti_info[RTAX_DST] = dst;
	info.rti_info[RTAX_GATEWAY] = gateway;
	info.rti_info[RTAX_NETMASK] = netmask;
	info.rti_info[RTAX_AUTHOR] = src;
	rt_missmsg(RTM_REDIRECT, &info, flags, error);
}

/*
* Routing table ioctl interface.
*/
int
rtioctl(req, data, p)
	int req;
	caddr_t data;
	struct proc *p;
{
	return (EOPNOTSUPP);
}

struct ifaddr *
ifa_ifwithroute(flags, dst, gateway)
	int flags;
	struct sockaddr	*dst, *gateway;
{
	register struct ifaddr *ifa;
	if ((flags & RTF_GATEWAY) == 0) {
		/*
		 * If we are adding a route to an interface,
		 * and the interface is a pt to pt link
		 * we should search for the destination
		 * as our clue to the interface.  Otherwise
		 * we can use the local address.
		 */
		ifa = 0;
		if (flags & RTF_HOST)
			ifa = ifa_ifwithdstaddr(dst);
		if (ifa == 0)
			ifa = ifa_ifwithaddr(gateway);
	} else {
		/*
		 * If we are adding a route to a remote net
		 * or host, the gateway may still be on the
		 * other end of a pt to pt link.
		 */
		ifa = ifa_ifwithdstaddr(gateway);
	}
	if (ifa == 0)
		ifa = ifa_ifwithnet(gateway);
	if (ifa == 0) {
		struct rtentry *rt = rtalloc1(dst, 0);
		if (rt == 0)
			return (0);
		rt->rt_refcnt--;
		if ((ifa = rt->rt_ifa) == 0)
			return (0);
	}
	if (ifa->ifa_addr->sa_family != dst->sa_family) {
		struct ifaddr *oifa = ifa;
		ifa = ifaof_ifpforaddr(dst, ifa->ifa_ifp);
		if (ifa == 0)
			ifa = oifa;
	}
	return (ifa);
}

#define ROUNDUP(a) (a>0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))

int
rtrequest(req, dst, gateway, netmask, flags, ret_nrt)
	int req, flags;
	struct sockaddr *dst, *gateway, *netmask;
	struct rtentry **ret_nrt;
{
	int s = splnet(); int error = 0;
	register struct rtentry *rt;
	register struct radix_node *rn;
	register struct radix_node_head *rnh;
	struct ifaddr *ifa;
	struct sockaddr *ndst;
#define senderr(x) { error = x ; goto bad; }

	if ((rnh = rt_tables[dst->sa_family]) == 0)
		senderr(ESRCH);
	if (flags & RTF_HOST)
		netmask = 0;
	switch (req) {
	case RTM_DELETE:
		if ((rn = rnh->rnh_deladdr(dst, netmask, rnh)) == 0)
			senderr(ESRCH);
		if (rn->rn_flags & (RNF_ACTIVE | RNF_ROOT))
			panic ("rtrequest delete");
		rt = (struct rtentry *)rn;
		rt->rt_flags &= ~RTF_UP;
		if (rt->rt_gwroute) {
			rt = rt->rt_gwroute; RTFREE(rt);
			(rt = (struct rtentry *)rn)->rt_gwroute = 0;
		}
		if ((ifa = rt->rt_ifa) && ifa->ifa_rtrequest)
			ifa->ifa_rtrequest(RTM_DELETE, rt, SA(0));
		rttrash++;
		if (ret_nrt)
			*ret_nrt = rt;
		else if (rt->rt_refcnt <= 0) {
			rt->rt_refcnt++;
			rtfree(rt);
		}
		break;

	case RTM_RESOLVE:
		if (ret_nrt == 0 || (rt = *ret_nrt) == 0)
			senderr(EINVAL);
		ifa = rt->rt_ifa;
		flags = rt->rt_flags & ~RTF_CLONING;
		gateway = rt->rt_gateway;
		if ((netmask = rt->rt_genmask) == 0)
			flags |= RTF_HOST;
		goto makeroute;

	case RTM_ADD:
		if ((ifa = ifa_ifwithroute(flags, dst, gateway)) == 0)
			senderr(ENETUNREACH);
	makeroute:
		R_Malloc(rt, struct rtentry *, sizeof(*rt));
		if (rt == 0)
			senderr(ENOBUFS);
		Bzero(rt, sizeof(*rt));
		rt->rt_flags = RTF_UP | flags;
		if (rt_setgate(rt, dst, gateway)) {
			Free(rt);
			senderr(ENOBUFS);
		}
		ndst = rt_key(rt);
		if (netmask) {
			rt_maskedcopy(dst, ndst, netmask);
		} else
			Bcopy(dst, ndst, dst->sa_len);
		rn = rnh->rnh_addaddr((caddr_t)ndst, (caddr_t)netmask,
					rnh, rt->rt_nodes);
		if (rn == 0) {
			if (rt->rt_gwroute)
				rtfree(rt->rt_gwroute);
			Free(rt_key(rt));
			Free(rt);
			senderr(EEXIST);
		}
		ifa->ifa_refcnt++;
		rt->rt_ifa = ifa;
		rt->rt_ifp = ifa->ifa_ifp;
		if (req == RTM_RESOLVE)
			rt->rt_rmx = (*ret_nrt)->rt_rmx; /* copy metrics */
		if (ifa->ifa_rtrequest)
			ifa->ifa_rtrequest(req, rt, SA(ret_nrt ? *ret_nrt : 0));
		if (ret_nrt) {
			*ret_nrt = rt;
			rt->rt_refcnt++;
		}
		break;
	}
bad:
	splx(s);
	return (error);
}

int
rt_setgate(rt0, dst, gate)
	struct rtentry *rt0;
	struct sockaddr *dst, *gate;
{
	caddr_t new, old;
	int dlen = ROUNDUP(dst->sa_len), glen = ROUNDUP(gate->sa_len);
	register struct rtentry *rt = rt0;

	if (rt->rt_gateway == 0 || glen > ROUNDUP(rt->rt_gateway->sa_len)) {
		old = (caddr_t)rt_key(rt);
		R_Malloc(new, caddr_t, dlen + glen);
		if (new == 0)
			return 1;
		rt->rt_nodes->rn_key = new;
	} else {
		new = rt->rt_nodes->rn_key;
		old = 0;
	}
	Bcopy(gate, (rt->rt_gateway = (struct sockaddr *)(new + dlen)), glen);
	if (old) {
		Bcopy(dst, new, dlen);
		Free(old);
	}
	if (rt->rt_gwroute) {
		rt = rt->rt_gwroute; RTFREE(rt);
		rt = rt0; rt->rt_gwroute = 0;
	}
	if (rt->rt_flags & RTF_GATEWAY) {
		rt->rt_gwroute = rtalloc1(gate, 1);
	}
	return 0;
}

void
rt_maskedcopy(src, dst, netmask)
	struct sockaddr *src, *dst, *netmask;
{
	register u_char *cp1 = (u_char *)src;
	register u_char *cp2 = (u_char *)dst;
	register u_char *cp3 = (u_char *)netmask;
	u_char *cplim = cp2 + *cp3;
	u_char *cplim2 = cp2 + *cp1;

	*cp2++ = *cp1++; *cp2++ = *cp1++; /* copies sa_len & sa_family */
	cp3 += 2;
	if (cplim > cplim2)
		cplim = cplim2;
	while (cp2 < cplim)
		*cp2++ = *cp1++ & *cp3++;
	if (cp2 < cplim2)
		bzero((caddr_t)cp2, (unsigned)(cplim2 - cp2));
}

/*
 * Set up a routing table entry, normally
 * for an interface.
 */
int
rtinit(ifa, cmd, flags)
	register struct ifaddr *ifa;
	int cmd, flags;
{
	register struct rtentry *rt;
	register struct sockaddr *dst;
	register struct sockaddr *deldst;
	struct mbuf *m = 0;
	struct rtentry *nrt = 0;
	int error;

	dst = flags & RTF_HOST ? ifa->ifa_dstaddr : ifa->ifa_addr;
	if (cmd == RTM_DELETE) {
		if ((flags & RTF_HOST) == 0 && ifa->ifa_netmask) {
			m = m_get(M_WAIT, MT_SONAME);
			deldst = mtod(m, struct sockaddr *);
			rt_maskedcopy(dst, deldst, ifa->ifa_netmask);
			dst = deldst;
		}
		if (rt = rtalloc1(dst, 0)) {
			rt->rt_refcnt--;
			if (rt->rt_ifa != ifa) {
				if (m)
					(void) m_free(m);
				return (flags & RTF_HOST ? EHOSTUNREACH
							: ENETUNREACH);
			}
		}
	}
	error = rtrequest(cmd, dst, ifa->ifa_addr, ifa->ifa_netmask,
			flags | ifa->ifa_flags, &nrt);
	if (m)
		(void) m_free(m);
	if (cmd == RTM_DELETE && error == 0 && (rt = nrt)) {
		rt_newaddrmsg(cmd, ifa, error, nrt);
		if (rt->rt_refcnt <= 0) {
			rt->rt_refcnt++;
			rtfree(rt);
		}
	}
	if (cmd == RTM_ADD && error == 0 && (rt = nrt)) {
		rt->rt_refcnt--;
		if (rt->rt_ifa != ifa) {
			printf("rtinit: wrong ifa (%x) was (%x)\n", ifa,
				rt->rt_ifa);
			if (rt->rt_ifa->ifa_rtrequest)
			    rt->rt_ifa->ifa_rtrequest(RTM_DELETE, rt, SA(0));
			IFAFREE(rt->rt_ifa);
			rt->rt_ifa = ifa;
			rt->rt_ifp = ifa->ifa_ifp;
			ifa->ifa_refcnt++;
			if (ifa->ifa_rtrequest)
			    ifa->ifa_rtrequest(RTM_ADD, rt, SA(0));
		}
		rt_newaddrmsg(cmd, ifa, error, nrt);
	}
	return (error);
}
Commit	Line	Data
	1	/*
	2	* Copyright (c) 1980, 1986, 1991, 1993
	3	* The Regents of the University of California. All rights reserved.
	4	*
	5	* %sccs.include.redist.c%
	6	*
	7	* @(#)route.c 8.1 (Berkeley) %G%
	8	*/
	9
	10	#include <sys/param.h>
	11	#include <sys/systm.h>
	12	#include <sys/proc.h>
	13	#include <sys/mbuf.h>
	14	#include <sys/socket.h>
	15	#include <sys/socketvar.h>
	16	#include <sys/domain.h>
	17	#include <sys/protosw.h>
	18	#include <sys/ioctl.h>
	19
	20	#include <net/if.h>
	21	#include <net/af.h>
	22	#include <net/route.h>
	23	#include <net/raw_cb.h>
	24
	25	#include <netinet/in.h>
	26	#include <netinet/in_var.h>
	27
	28	#ifdef NS
	29	#include <netns/ns.h>
	30	#endif
	31
	32	#define SA(p) ((struct sockaddr *)(p))
	33
	34	int rttrash; /* routes not in table but not freed */
	35	struct sockaddr wildcard; /* zero valued cookie for wildcard searches */
	36
	37	void
	38	rtable_init(table)
	39	void **table;
	40	{
	41	struct domain *dom;
	42	for (dom = domains; dom; dom = dom->dom_next)
	43	if (dom->dom_rtattach)
	44	dom->dom_rtattach(&table[dom->dom_family],
	45	dom->dom_rtoffset);
	46	}
	47
	48	void
	49	route_init()
	50	{
	51	rn_init(); /* initialize all zeroes, all ones, mask table */
	52	rtable_init((void **)rt_tables);
	53	}
	54
	55	/*
	56	* Packet routing routines.
	57	*/
	58	void
	59	rtalloc(ro)
	60	register struct route *ro;
	61	{
	62	if (ro->ro_rt && ro->ro_rt->rt_ifp && (ro->ro_rt->rt_flags & RTF_UP))
	63	return; /* XXX */
	64	ro->ro_rt = rtalloc1(&ro->ro_dst, 1);
	65	}
	66
	67	struct rtentry *
	68	rtalloc1(dst, report)
	69	register struct sockaddr *dst;
	70	int report;
	71	{
	72	register struct radix_node_head *rnh = rt_tables[dst->sa_family];
	73	register struct rtentry *rt;
	74	register struct radix_node *rn;
	75	struct rtentry *newrt = 0;
	76	struct rt_addrinfo info;
	77	int s = splnet(), err = 0, msgtype = RTM_MISS;
	78
	79	if (rnh && (rn = rnh->rnh_matchaddr((caddr_t)dst, rnh)) &&
	80	((rn->rn_flags & RNF_ROOT) == 0)) {
	81	newrt = rt = (struct rtentry *)rn;
	82	if (report && (rt->rt_flags & RTF_CLONING)) {
	83	err = rtrequest(RTM_RESOLVE, dst, SA(0),
	84	SA(0), 0, &newrt);
	85	if (err) {
	86	newrt = rt;
	87	rt->rt_refcnt++;
	88	goto miss;
	89	}
	90	if ((rt = newrt) && (rt->rt_flags & RTF_XRESOLVE)) {
	91	msgtype = RTM_RESOLVE;
	92	goto miss;
	93	}
	94	} else
	95	rt->rt_refcnt++;
	96	} else {
	97	rtstat.rts_unreach++;
	98	miss: if (report) {
	99	bzero((caddr_t)&info, sizeof(info));
	100	info.rti_info[RTAX_DST] = dst;
	101	rt_missmsg(msgtype, &info, 0, err);
	102	}
	103	}
	104	splx(s);
	105	return (newrt);
	106	}
	107
	108	void
	109	rtfree(rt)
	110	register struct rtentry *rt;
	111	{
	112	register struct ifaddr *ifa;
	113
	114	if (rt == 0)
	115	panic("rtfree");
	116	rt->rt_refcnt--;
	117	if (rt->rt_refcnt <= 0 && (rt->rt_flags & RTF_UP) == 0) {
	118	if (rt->rt_nodes->rn_flags & (RNF_ACTIVE \| RNF_ROOT))
	119	panic ("rtfree 2");
	120	rttrash--;
	121	if (rt->rt_refcnt < 0) {
	122	printf("rtfree: %x not freed (neg refs)\n", rt);
	123	return;
	124	}
	125	ifa = rt->rt_ifa;
	126	IFAFREE(ifa);
	127	Free(rt_key(rt));
	128	Free(rt);
	129	}
	130	}
	131
	132	void
	133	ifafree(ifa)
	134	register struct ifaddr *ifa;
	135	{
	136	if (ifa == NULL)
	137	panic("ifafree");
	138	if (ifa->ifa_refcnt == 0)
	139	free(ifa, M_IFADDR);
	140	else
	141	ifa->ifa_refcnt--;
	142	}
	143
	144	/*
	145	* Force a routing table entry to the specified
	146	* destination to go through the given gateway.
	147	* Normally called as a result of a routing redirect
	148	* message from the network layer.
	149	*
	150	* N.B.: must be called at splnet
	151	*
	152	*/
	153	int
	154	rtredirect(dst, gateway, netmask, flags, src, rtp)
	155	struct sockaddr dst, gateway, netmask, src;
	156	int flags;
	157	struct rtentry **rtp;
	158	{
	159	register struct rtentry *rt;
	160	int error = 0;
	161	short *stat = 0;
	162	struct rt_addrinfo info;
	163	struct ifaddr *ifa;
	164
	165	/* verify the gateway is directly reachable */
	166	if ((ifa = ifa_ifwithnet(gateway)) == 0) {
	167	error = ENETUNREACH;
	168	goto out;
	169	}
	170	rt = rtalloc1(dst, 0);
	171	/*
	172	* If the redirect isn't from our current router for this dst,
	173	* it's either old or wrong. If it redirects us to ourselves,
	174	* we have a routing loop, perhaps as a result of an interface
	175	* going down recently.
	176	*/
	177	#define equal(a1, a2) (bcmp((caddr_t)(a1), (caddr_t)(a2), (a1)->sa_len) == 0)
	178	if (!(flags & RTF_DONE) && rt &&
	179	(!equal(src, rt->rt_gateway) \|\| rt->rt_ifa != ifa))
	180	error = EINVAL;
	181	else if (ifa_ifwithaddr(gateway))
	182	error = EHOSTUNREACH;
	183	if (error)
	184	goto done;
	185	/*
	186	* Create a new entry if we just got back a wildcard entry
	187	* or the the lookup failed. This is necessary for hosts
	188	* which use routing redirects generated by smart gateways
	189	* to dynamically build the routing tables.
	190	*/
	191	if ((rt == 0) \|\| (rt_mask(rt) && rt_mask(rt)->sa_len < 2))
	192	goto create;
	193	/*
	194	* Don't listen to the redirect if it's
	195	* for a route to an interface.
	196	*/
	197	if (rt->rt_flags & RTF_GATEWAY) {
	198	if (((rt->rt_flags & RTF_HOST) == 0) && (flags & RTF_HOST)) {
	199	/*
	200	* Changing from route to net => route to host.
	201	* Create new route, rather than smashing route to net.
	202	*/
	203	create:
	204	flags \|= RTF_GATEWAY \| RTF_DYNAMIC;
	205	error = rtrequest((int)RTM_ADD, dst, gateway,
	206	netmask, flags,
	207	(struct rtentry **)0);
	208	stat = &rtstat.rts_dynamic;
	209	} else {
	210	/*
	211	* Smash the current notion of the gateway to
	212	* this destination. Should check about netmask!!!
	213	*/
	214	rt->rt_flags \|= RTF_MODIFIED;
	215	flags \|= RTF_MODIFIED;
	216	stat = &rtstat.rts_newgateway;
	217	rt_setgate(rt, rt_key(rt), gateway);
	218	}
	219	} else
	220	error = EHOSTUNREACH;
	221	done:
	222	if (rt) {
	223	if (rtp && !error)
	224	*rtp = rt;
	225	else
	226	rtfree(rt);
	227	}
	228	out:
	229	if (error)
	230	rtstat.rts_badredirect++;
	231	else if (stat != NULL)
	232	(*stat)++;
	233	bzero((caddr_t)&info, sizeof(info));
	234	info.rti_info[RTAX_DST] = dst;
	235	info.rti_info[RTAX_GATEWAY] = gateway;
	236	info.rti_info[RTAX_NETMASK] = netmask;
	237	info.rti_info[RTAX_AUTHOR] = src;
	238	rt_missmsg(RTM_REDIRECT, &info, flags, error);
	239	}
	240
	241	/*
	242	* Routing table ioctl interface.
	243	*/
	244	int
	245	rtioctl(req, data, p)
	246	int req;
	247	caddr_t data;
	248	struct proc *p;
	249	{
	250	return (EOPNOTSUPP);
	251	}
	252
	253	struct ifaddr *
	254	ifa_ifwithroute(flags, dst, gateway)
	255	int flags;
	256	struct sockaddr dst, gateway;
	257	{
	258	register struct ifaddr *ifa;
	259	if ((flags & RTF_GATEWAY) == 0) {
	260	/*
	261	* If we are adding a route to an interface,
	262	* and the interface is a pt to pt link
	263	* we should search for the destination
	264	* as our clue to the interface. Otherwise
	265	* we can use the local address.
	266	*/
	267	ifa = 0;
	268	if (flags & RTF_HOST)
	269	ifa = ifa_ifwithdstaddr(dst);
	270	if (ifa == 0)
	271	ifa = ifa_ifwithaddr(gateway);
	272	} else {
	273	/*
	274	* If we are adding a route to a remote net
	275	* or host, the gateway may still be on the
	276	* other end of a pt to pt link.
	277	*/
	278	ifa = ifa_ifwithdstaddr(gateway);
	279	}
	280	if (ifa == 0)
	281	ifa = ifa_ifwithnet(gateway);
	282	if (ifa == 0) {
	283	struct rtentry *rt = rtalloc1(dst, 0);
	284	if (rt == 0)
	285	return (0);
	286	rt->rt_refcnt--;
	287	if ((ifa = rt->rt_ifa) == 0)
	288	return (0);
	289	}
	290	if (ifa->ifa_addr->sa_family != dst->sa_family) {
	291	struct ifaddr *oifa = ifa;
	292	ifa = ifaof_ifpforaddr(dst, ifa->ifa_ifp);
	293	if (ifa == 0)
	294	ifa = oifa;
	295	}
	296	return (ifa);
	297	}
	298
	299	#define ROUNDUP(a) (a>0 ? (1 + (((a) - 1) \| (sizeof(long) - 1))) : sizeof(long))
	300
	301	int
	302	rtrequest(req, dst, gateway, netmask, flags, ret_nrt)
	303	int req, flags;
	304	struct sockaddr dst, gateway, *netmask;
	305	struct rtentry **ret_nrt;
	306	{
	307	int s = splnet(); int error = 0;
	308	register struct rtentry *rt;
	309	register struct radix_node *rn;
	310	register struct radix_node_head *rnh;
	311	struct ifaddr *ifa;
	312	struct sockaddr *ndst;
	313	#define senderr(x) { error = x ; goto bad; }
	314
	315	if ((rnh = rt_tables[dst->sa_family]) == 0)
	316	senderr(ESRCH);
	317	if (flags & RTF_HOST)
	318	netmask = 0;
	319	switch (req) {
	320	case RTM_DELETE:
	321	if ((rn = rnh->rnh_deladdr(dst, netmask, rnh)) == 0)
	322	senderr(ESRCH);
	323	if (rn->rn_flags & (RNF_ACTIVE \| RNF_ROOT))
	324	panic ("rtrequest delete");
	325	rt = (struct rtentry *)rn;
	326	rt->rt_flags &= ~RTF_UP;
	327	if (rt->rt_gwroute) {
	328	rt = rt->rt_gwroute; RTFREE(rt);
	329	(rt = (struct rtentry *)rn)->rt_gwroute = 0;
	330	}
	331	if ((ifa = rt->rt_ifa) && ifa->ifa_rtrequest)
	332	ifa->ifa_rtrequest(RTM_DELETE, rt, SA(0));
	333	rttrash++;
	334	if (ret_nrt)
	335	*ret_nrt = rt;
	336	else if (rt->rt_refcnt <= 0) {
	337	rt->rt_refcnt++;
	338	rtfree(rt);
	339	}
	340	break;
	341
	342	case RTM_RESOLVE:
	343	if (ret_nrt == 0 \|\| (rt = *ret_nrt) == 0)
	344	senderr(EINVAL);
	345	ifa = rt->rt_ifa;
	346	flags = rt->rt_flags & ~RTF_CLONING;
	347	gateway = rt->rt_gateway;
	348	if ((netmask = rt->rt_genmask) == 0)
	349	flags \|= RTF_HOST;
	350	goto makeroute;
	351
	352	case RTM_ADD:
	353	if ((ifa = ifa_ifwithroute(flags, dst, gateway)) == 0)
	354	senderr(ENETUNREACH);
	355	makeroute:
	356	R_Malloc(rt, struct rtentry , sizeof(rt));
	357	if (rt == 0)
	358	senderr(ENOBUFS);
	359	Bzero(rt, sizeof(*rt));
	360	rt->rt_flags = RTF_UP \| flags;
	361	if (rt_setgate(rt, dst, gateway)) {
	362	Free(rt);
	363	senderr(ENOBUFS);
	364	}
	365	ndst = rt_key(rt);
	366	if (netmask) {
	367	rt_maskedcopy(dst, ndst, netmask);
	368	} else
	369	Bcopy(dst, ndst, dst->sa_len);
	370	rn = rnh->rnh_addaddr((caddr_t)ndst, (caddr_t)netmask,
	371	rnh, rt->rt_nodes);
	372	if (rn == 0) {
	373	if (rt->rt_gwroute)
	374	rtfree(rt->rt_gwroute);
	375	Free(rt_key(rt));
	376	Free(rt);
	377	senderr(EEXIST);
	378	}
	379	ifa->ifa_refcnt++;
	380	rt->rt_ifa = ifa;
	381	rt->rt_ifp = ifa->ifa_ifp;
	382	if (req == RTM_RESOLVE)
	383	rt->rt_rmx = (ret_nrt)->rt_rmx; / copy metrics */
	384	if (ifa->ifa_rtrequest)
	385	ifa->ifa_rtrequest(req, rt, SA(ret_nrt ? *ret_nrt : 0));
	386	if (ret_nrt) {
	387	*ret_nrt = rt;
	388	rt->rt_refcnt++;
	389	}
	390	break;
	391	}
	392	bad:
	393	splx(s);
	394	return (error);
	395	}
	396
	397	int
	398	rt_setgate(rt0, dst, gate)
	399	struct rtentry *rt0;
	400	struct sockaddr dst, gate;
	401	{
	402	caddr_t new, old;
	403	int dlen = ROUNDUP(dst->sa_len), glen = ROUNDUP(gate->sa_len);
	404	register struct rtentry *rt = rt0;
	405
	406	if (rt->rt_gateway == 0 \|\| glen > ROUNDUP(rt->rt_gateway->sa_len)) {
	407	old = (caddr_t)rt_key(rt);
	408	R_Malloc(new, caddr_t, dlen + glen);
	409	if (new == 0)
	410	return 1;
	411	rt->rt_nodes->rn_key = new;
	412	} else {
	413	new = rt->rt_nodes->rn_key;
	414	old = 0;
	415	}
	416	Bcopy(gate, (rt->rt_gateway = (struct sockaddr *)(new + dlen)), glen);
	417	if (old) {
	418	Bcopy(dst, new, dlen);
	419	Free(old);
	420	}
	421	if (rt->rt_gwroute) {
	422	rt = rt->rt_gwroute; RTFREE(rt);
	423	rt = rt0; rt->rt_gwroute = 0;
	424	}
	425	if (rt->rt_flags & RTF_GATEWAY) {
	426	rt->rt_gwroute = rtalloc1(gate, 1);
	427	}
	428	return 0;
	429	}
	430
	431	void
	432	rt_maskedcopy(src, dst, netmask)
	433	struct sockaddr src, dst, *netmask;
	434	{
	435	register u_char cp1 = (u_char )src;
	436	register u_char cp2 = (u_char )dst;
	437	register u_char cp3 = (u_char )netmask;
	438	u_char cplim = cp2 + cp3;
	439	u_char cplim2 = cp2 + cp1;
	440
	441	cp2++ = cp1++; cp2++ = cp1++; /* copies sa_len & sa_family */
	442	cp3 += 2;
	443	if (cplim > cplim2)
	444	cplim = cplim2;
	445	while (cp2 < cplim)
	446	cp2++ = cp1++ & *cp3++;
	447	if (cp2 < cplim2)
	448	bzero((caddr_t)cp2, (unsigned)(cplim2 - cp2));
	449	}
	450
	451	/*
	452	* Set up a routing table entry, normally
	453	* for an interface.
	454	*/
	455	int
	456	rtinit(ifa, cmd, flags)
	457	register struct ifaddr *ifa;
	458	int cmd, flags;
	459	{
	460	register struct rtentry *rt;
	461	register struct sockaddr *dst;
	462	register struct sockaddr *deldst;
	463	struct mbuf *m = 0;
	464	struct rtentry *nrt = 0;
	465	int error;
	466
	467	dst = flags & RTF_HOST ? ifa->ifa_dstaddr : ifa->ifa_addr;
	468	if (cmd == RTM_DELETE) {
	469	if ((flags & RTF_HOST) == 0 && ifa->ifa_netmask) {
	470	m = m_get(M_WAIT, MT_SONAME);
	471	deldst = mtod(m, struct sockaddr *);
	472	rt_maskedcopy(dst, deldst, ifa->ifa_netmask);
	473	dst = deldst;
	474	}
	475	if (rt = rtalloc1(dst, 0)) {
	476	rt->rt_refcnt--;
	477	if (rt->rt_ifa != ifa) {
	478	if (m)
	479	(void) m_free(m);
	480	return (flags & RTF_HOST ? EHOSTUNREACH
	481	: ENETUNREACH);
	482	}
	483	}
	484	}
	485	error = rtrequest(cmd, dst, ifa->ifa_addr, ifa->ifa_netmask,
	486	flags \| ifa->ifa_flags, &nrt);
	487	if (m)
	488	(void) m_free(m);
	489	if (cmd == RTM_DELETE && error == 0 && (rt = nrt)) {
	490	rt_newaddrmsg(cmd, ifa, error, nrt);
	491	if (rt->rt_refcnt <= 0) {
	492	rt->rt_refcnt++;
	493	rtfree(rt);
	494	}
	495	}
	496	if (cmd == RTM_ADD && error == 0 && (rt = nrt)) {
	497	rt->rt_refcnt--;
	498	if (rt->rt_ifa != ifa) {
	499	printf("rtinit: wrong ifa (%x) was (%x)\n", ifa,
	500	rt->rt_ifa);
	501	if (rt->rt_ifa->ifa_rtrequest)
	502	rt->rt_ifa->ifa_rtrequest(RTM_DELETE, rt, SA(0));
	503	IFAFREE(rt->rt_ifa);
	504	rt->rt_ifa = ifa;
	505	rt->rt_ifp = ifa->ifa_ifp;
	506	ifa->ifa_refcnt++;
	507	if (ifa->ifa_rtrequest)
	508	ifa->ifa_rtrequest(RTM_ADD, rt, SA(0));
	509	}
	510	rt_newaddrmsg(cmd, ifa, error, nrt);
	511	}
	512	return (error);
	513	}