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Commit cf6b1982 authored by YOSHIFUJI Hideaki's avatar YOSHIFUJI Hideaki Committed by David S. Miller
Browse files

[IPV6] ROUTE: Introduce a helper to check route validity. 



Signed-off-by: default avatarYOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Acked-by: default avatarVille Nuorvala <vnuorval@tcs.hut.fi>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent af184765

net/ipv6/ip6_output.c

+12 −7
Original line number Diff line number Diff line
@@ -726,6 +726,14 @@ static int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *)) 
	return err;

}



static inline int ip6_rt_check(struct rt6key *rt_key,

			       struct in6_addr *fl_addr,

			       struct in6_addr *addr_cache)

{

	return ((rt_key->plen != 128 || !ipv6_addr_equal(fl_addr, &rt_key->addr)) &&

		(addr_cache == NULL || !ipv6_addr_equal(fl_addr, addr_cache)));

}



static struct dst_entry *ip6_sk_dst_check(struct sock *sk,

					  struct dst_entry *dst,

					  struct flowi *fl)
@@ -741,8 +749,8 @@ static struct dst_entry *ip6_sk_dst_check(struct sock *sk, 
	 * that we do not support routing by source, TOS,

	 * and MSG_DONTROUTE 		--ANK (980726)

	 *

	 * 1. If route was host route, check that

	 *    cached destination is current.

	 * 1. ip6_rt_check(): If route was host route,

	 *    check that cached destination is current.

	 *    If it is network route, we still may

	 *    check its validity using saved pointer

	 *    to the last used address: daddr_cache.
@@ -753,11 +761,8 @@ static struct dst_entry *ip6_sk_dst_check(struct sock *sk, 
	 *    sockets.

	 * 2. oif also should be the same.

	 */

	if (((rt->rt6i_dst.plen != 128 ||

	      !ipv6_addr_equal(&fl->fl6_dst, &rt->rt6i_dst.addr))

	     && (np->daddr_cache == NULL ||

		 !ipv6_addr_equal(&fl->fl6_dst, np->daddr_cache)))

	    || (fl->oif && fl->oif != dst->dev->ifindex)) {

	if (ip6_rt_check(&rt->rt6i_dst, &fl->fl6_dst, np->daddr_cache) ||

	    (fl->oif && fl->oif != dst->dev->ifindex)) {

		dst_release(dst);

		dst = NULL;

	}