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 8f749742f11f210dfaac632a78a7857cc448c25a..0cb580cd5f002048a53340d861248a99c2193928 100644 (file)
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -2077,9 +2077,6 @@ 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;