udp: fix SO_BINDTODEVICE

Damir reported a breakage of SO_BINDTODEVICE for UDP sockets.
In absence of VRF devices, after commit fb74c27735f0 ("net:
ipv4: add second dif to udp socket lookups") the dif mismatch
isn't fatal anymore for UDP socket lookup with non null
sk_bound_dev_if, breaking SO_BINDTODEVICE semantics.

This changeset addresses the issue making the dif match mandatory
again in the above scenario.

Reported-by: Damir Mansurov <dnman@oktetlabs.ru>
Fixes: fb74c27735f0 ("net: ipv4: add second dif to udp socket lookups")
Fixes: 1801b570dd2a ("net: ipv6: add second dif to udp socket lookups")
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Acked-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 24b5c59..c2a292d 100644 (file)
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -401,9 +401,9 @@ static int compute_score(struct sock *sk, struct net *net,
                bool dev_match = (sk->sk_bound_dev_if == dif ||
                                  sk->sk_bound_dev_if == sdif);
 
-               if (exact_dif && !dev_match)
+               if (!dev_match)
                        return -1;
-               if (sk->sk_bound_dev_if && dev_match)
+               if (sk->sk_bound_dev_if)
                        score += 4;
        }
 

diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 4ec76a8..ea07300 100644 (file)
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -148,9 +148,9 @@ static int compute_score(struct sock *sk, struct net *net,
                bool dev_match = (sk->sk_bound_dev_if == dif ||
                                  sk->sk_bound_dev_if == sdif);
 
-               if (exact_dif && !dev_match)
+               if (!dev_match)
                        return -1;
-               if (sk->sk_bound_dev_if && dev_match)
+               if (sk->sk_bound_dev_if)
                        score++;
        }