ipv6: allow PMTU exceptions to local routes

[ Upstream commit 0975764684487bf3f7a47eef009e750ea41bd514 ]

IPVS setups with local client and remote tunnel server need
to create exception for the local virtual IP. What we do is to
change PMTU from 64KB (on "lo") to 1460 in the common case.

Suggested-by: Martin KaFai Lau <kafai@fb.com>
Fixes: 45e4fd26683c ("ipv6: Only create RTF_CACHE routes after encountering pmtu exception")
Fixes: 7343ff31ebf0 ("ipv6: Don't create clones of host routes.")
Signed-off-by: Julian Anastasov <ja@ssi.bg>
Acked-by: David Ahern <dsahern@gmail.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 4530a82aaa2ee53cb0e08ad70a14e473d2342dd2..b94345e657f781b3d7617dda3eb49b5ec131bf49 100644 (file)
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -2149,9 +2149,6 @@ static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
        const struct in6_addr *daddr, *saddr;
        struct rt6_info *rt6 = (struct rt6_info *)dst;
 
-       if (rt6->rt6i_flags & RTF_LOCAL)
-               return;
-
        if (dst_metric_locked(dst, RTAX_MTU))
                return;