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udp: fix SO_BINDTODEVICE

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[ Upstream commit 69678bcd4d2dedbc3e8fcd6d7d99f283d83c531a ]

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Paolo Abeni 2018-05-09 12:42:34 +02:00 committed by Greg Kroah-Hartman
parent 8151fe6861
commit 59afc1841b
2 changed files with 4 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
net/ipv4/udp.c
View File

@ -413,9 +413,9 @@ 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;
}

4
net/ipv6/udp.c
View File

@ -164,9 +164,9 @@ 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++;
}