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Commit a6279458 authored by YOSHIFUJI Hideaki's avatar YOSHIFUJI Hideaki Committed by David S. Miller
Browse files

[IPV6] NDISC: Search over all possible rules on receipt of redirect. 



Split up function for finding routes for redirects.

Signed-off-by: default avatarYOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 5e032e32

net/ipv6/route.c

+61 −24
Original line number Diff line number Diff line
@@ -1279,19 +1279,18 @@ static int ip6_route_del(struct fib6_config *cfg) 
/*

 *	Handle redirects

 */

void rt6_redirect(struct in6_addr *dest, struct in6_addr *src,

		  struct in6_addr *saddr,

		  struct neighbour *neigh, u8 *lladdr, int on_link)

struct ip6rd_flowi {

	struct flowi fl;

	struct in6_addr gateway;

};



static struct rt6_info *__ip6_route_redirect(struct fib6_table *table,

					     struct flowi *fl,

					     int flags)

{

	struct rt6_info *rt, *nrt = NULL;

	struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl;

	struct rt6_info *rt;

	struct fib6_node *fn;

	struct fib6_table *table;

	struct netevent_redirect netevent;



	/* TODO: Very lazy, might need to check all tables */

	table = fib6_get_table(RT6_TABLE_MAIN);

	if (table == NULL)

		return;



	/*

	 * Get the "current" route for this destination and
@@ -1305,7 +1304,7 @@ void rt6_redirect(struct in6_addr *dest, struct in6_addr *src, 
	 */



	read_lock_bh(&table->tb6_lock);

	fn = fib6_lookup(&table->tb6_root, dest, src);

	fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src);

restart:

	for (rt = fn->leaf; rt; rt = rt->u.next) {

		/*
@@ -1320,15 +1319,15 @@ void rt6_redirect(struct in6_addr *dest, struct in6_addr *src, 
			continue;

		if (!(rt->rt6i_flags & RTF_GATEWAY))

			continue;

		if (neigh->dev != rt->rt6i_dev)

		if (fl->oif != rt->rt6i_dev->ifindex)

			continue;

		if (!ipv6_addr_equal(saddr, &rt->rt6i_gateway))

		if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))

			continue;

		break;

	}

	if (rt)

		dst_hold(&rt->u.dst);

	else if (rt6_need_strict(dest)) {



	if (!rt) {

		if (rt6_need_strict(&fl->fl6_dst)) {

			while ((fn = fn->parent) != NULL) {

				if (fn->fn_flags & RTN_ROOT)

					break;
@@ -1336,13 +1335,51 @@ void rt6_redirect(struct in6_addr *dest, struct in6_addr *src, 
					goto restart;

			}

		}

		rt = &ip6_null_entry;

	}

	dst_hold(&rt->u.dst);



	read_unlock_bh(&table->tb6_lock);



	if (!rt) {

	return rt;

};



static struct rt6_info *ip6_route_redirect(struct in6_addr *dest,

					   struct in6_addr *src,

					   struct in6_addr *gateway,

					   struct net_device *dev)

{

	struct ip6rd_flowi rdfl = {

		.fl = {

			.oif = dev->ifindex,

			.nl_u = {

				.ip6_u = {

					.daddr = *dest,

					.saddr = *src,

				},

			},

		},

		.gateway = *gateway,

	};

	int flags = rt6_need_strict(dest) ? RT6_F_STRICT : 0;



	return (struct rt6_info *)fib6_rule_lookup((struct flowi *)&rdfl, flags, __ip6_route_redirect);

}



void rt6_redirect(struct in6_addr *dest, struct in6_addr *src,

		  struct in6_addr *saddr,

		  struct neighbour *neigh, u8 *lladdr, int on_link)

{

	struct rt6_info *rt, *nrt = NULL;

	struct netevent_redirect netevent;



	rt = ip6_route_redirect(dest, src, saddr, neigh->dev);



	if (rt == &ip6_null_entry) {

		if (net_ratelimit())

			printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop "

			       "for redirect target\n");

		return;

		goto out;

	}



	/*