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ipv6: fix rt6_update_expires

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Commit 1716a961 (ipv6: fix problem with expired dst cache) broke PMTU
discovery. rt6_update_expires() calls dst_set_expires(), which only updates
dst->expires if it has not been set previously (expires == 0) or if the new
expires is earlier than the current dst->expires.

rt6_update_expires() needs to zero rt->dst.expires, otherwise it will contain
ivalid data left over from rt->dst.from and will confuse dst_set_expires().

Signed-off-by: Jiri Bohac <jbohac@suse.cz>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Bohac 2012-04-16 03:34:39 +00:00 committed by David S. Miller
parent b95465c8fc
commit edfb5d4687
1 changed files with 8 additions and 2 deletions
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10
include/net/ip6_fib.h
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@ -143,8 +143,14 @@ static inline void rt6_set_expires(struct rt6_info *rt, unsigned long expires)
static inline void rt6_update_expires(struct rt6_info *rt, int timeout)
{
if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from)
dst_release(rt->dst.from);
if (!(rt->rt6i_flags & RTF_EXPIRES)) {
if (rt->dst.from)
dst_release(rt->dst.from);
/* dst_set_expires relies on expires == 0
* if it has not been set previously.
*/
rt->dst.expires = 0;
}
dst_set_expires(&rt->dst, timeout);
rt->rt6i_flags |= RTF_EXPIRES;