ipv6: do not create neighbor entries for local delivery

[ Upstream commit bd30e947207e2ea0ff2c08f5b4a03025ddce48d3 ]

They will be created at output, if ever needed. This avoids creating
empty neighbor entries when TPROXYing/Forwarding packets for addresses
that are not even directly reachable.

Note that IPv4 already handles it this way. No neighbor entries are
created for local input.

Tested by myself and customer.

Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: Marcelo Ricardo Leitner <mleitner@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 19724bd3b10a478a38be99e799035901c5ef6500..791c1fa879b27cfad4a3eed6533dc6a0a82b0240 100644 (file)
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -819,7 +819,8 @@ restart:
        dst_hold(&rt->dst);
        read_unlock_bh(&table->tb6_lock);
 
-       if (!dst_get_neighbour_raw(&rt->dst) && !(rt->rt6i_flags & RTF_NONEXTHOP))
+       if (!dst_get_neighbour_raw(&rt->dst)
+           && !(rt->rt6i_flags & (RTF_NONEXTHOP | RTF_LOCAL)))
                nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr);
        else if (!(rt->dst.flags & DST_HOST))
                nrt = rt6_alloc_clone(rt, &fl6->daddr);