From 31afeb425f7fad8bcf9561aeb0b8405479f97a98 Mon Sep 17 00:00:00 2001 From: Wei Wang Date: Fri, 26 Jan 2018 11:40:17 -0800 Subject: [PATCH] ipv6: change route cache aging logic In current route cache aging logic, if a route has both RTF_EXPIRE and RTF_GATEWAY set, the route will only be removed if the neighbor cache has no NTF_ROUTER flag. Otherwise, even if the route has expired, it won't get deleted. Fix this logic to always check if the route has expired first and then do the gateway neighbor cache check if previous check decide to not remove the exception entry. Fixes: 1859bac04fb6 ("ipv6: remove from fib tree aged out RTF_CACHE dst") Signed-off-by: Wei Wang Signed-off-by: Eric Dumazet Acked-by: Martin KaFai Lau Acked-by: Paolo Abeni Signed-off-by: David S. Miller --- net/ipv6/route.c | 20 ++++++++++++-------- 1 file changed, 12 insertions(+), 8 deletions(-) diff --git a/net/ipv6/route.c b/net/ipv6/route.c index fe3966a9c999..fb2d251c0500 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -1585,12 +1585,19 @@ static void rt6_age_examine_exception(struct rt6_exception_bucket *bucket, * EXPIRES exceptions - e.g. pmtu-generated ones are pruned when * expired, independently from their aging, as per RFC 8201 section 4 */ - if (!(rt->rt6i_flags & RTF_EXPIRES) && - time_after_eq(now, rt->dst.lastuse + gc_args->timeout)) { - RT6_TRACE("aging clone %p\n", rt); + if (!(rt->rt6i_flags & RTF_EXPIRES)) { + if (time_after_eq(now, rt->dst.lastuse + gc_args->timeout)) { + RT6_TRACE("aging clone %p\n", rt); + rt6_remove_exception(bucket, rt6_ex); + return; + } + } else if (time_after(jiffies, rt->dst.expires)) { + RT6_TRACE("purging expired route %p\n", rt); rt6_remove_exception(bucket, rt6_ex); return; - } else if (rt->rt6i_flags & RTF_GATEWAY) { + } + + if (rt->rt6i_flags & RTF_GATEWAY) { struct neighbour *neigh; __u8 neigh_flags = 0; @@ -1605,11 +1612,8 @@ static void rt6_age_examine_exception(struct rt6_exception_bucket *bucket, rt6_remove_exception(bucket, rt6_ex); return; } - } else if (__rt6_check_expired(rt)) { - RT6_TRACE("purging expired route %p\n", rt); - rt6_remove_exception(bucket, rt6_ex); - return; } + gc_args->more++; } -- 2.30.2