On 9/25/15 7:56 AM, Wolfgang Nothdurft wrote:
It seems that the ip6_route_output(net, sk, fl6) kernel function ignores
the fl6.flowi6_oif parameter for the routing decision.
It is considered, but a mismatch is not considered fatal.
I think the attached should fix your problem.
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 118f8fa1a809..cc52458f7226 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -1169,7 +1169,8 @@ struct dst_entry *ip6_route_output(struct net *net, const
struct sock *sk,
fl6->flowi6_iif = LOOPBACK_IFINDEX;
- if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr))
+ if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) ||
+ fl6->flowi6_oif)
flags |= RT6_LOOKUP_F_IFACE;
if (!ipv6_addr_any(&fl6->saddr))
