[PATCH net] net/tcp: Fix socket lookups with SO_BINDTODEVICE

[PATCH net] net/tcp: Fix socket lookups with SO_BINDTODEVICE

[dsahern]

From: David Ahern <dsahern@gmail.com>

Similar to 69678bcd4d2d ("udp: fix SO_BINDTODEVICE"), TCP socket lookups
need to fail if dev_match is not true. Currently, a packet to a given port
can match a socket bound to device when it should not. In the VRF case,
this causes the lookup to hit a VRF socket and not a global socket
resulting in a response trying to go through the VRF when it should it.

Fixes: 3fa6f616a7a4d ("net: ipv4: add second dif to inet socket lookups")
Fixes: 4297a0ef08572 ("net: ipv6: add second dif to inet6 socket lookups")
Reported-by: Lou Berger <lberger@labn.net>
Diagnosed-by: Renato Westphal <renato@opensourcerouting.org>
Tested-by: Renato Westphal <renato@opensourcerouting.org>
Signed-off-by: David Ahern <dsahern@gmail.com>
---
 net/ipv4/inet_hashtables.c  | 4 ++--
 net/ipv6/inet6_hashtables.c | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
index 31ff46daae97..3647167c8fa3 100644
--- a/net/ipv4/inet_hashtables.c
+++ b/net/ipv4/inet_hashtables.c
@@ -243,9 +243,9 @@ static inline 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;
 		}
 		if (sk->sk_incoming_cpu == raw_smp_processor_id())
diff --git a/net/ipv6/inet6_hashtables.c b/net/ipv6/inet6_hashtables.c
index 2febe26de6a1..595ad408dba0 100644
--- a/net/ipv6/inet6_hashtables.c
+++ b/net/ipv6/inet6_hashtables.c
@@ -113,9 +113,9 @@ static inline 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++;
 		}
 		if (sk->sk_incoming_cpu == raw_smp_processor_id())
-- 
2.11.0

Re: [PATCH net] net/tcp: Fix socket lookups with SO_BINDTODEVICE

[David Miller]

From: dsahern@kernel.org
Date: Mon, 18 Jun 2018 12:30:37 -0700

> From: David Ahern <dsahern@gmail.com>
> 
> Similar to 69678bcd4d2d ("udp: fix SO_BINDTODEVICE"), TCP socket lookups
> need to fail if dev_match is not true. Currently, a packet to a given port
> can match a socket bound to device when it should not. In the VRF case,
> this causes the lookup to hit a VRF socket and not a global socket
> resulting in a response trying to go through the VRF when it should it.
                                                                      ^^^

"not", I fixed this up for you.

> Fixes: 3fa6f616a7a4d ("net: ipv4: add second dif to inet socket lookups")
> Fixes: 4297a0ef08572 ("net: ipv6: add second dif to inet6 socket lookups")
> Reported-by: Lou Berger <lberger@labn.net>
> Diagnosed-by: Renato Westphal <renato@opensourcerouting.org>
> Tested-by: Renato Westphal <renato@opensourcerouting.org>
> Signed-off-by: David Ahern <dsahern@gmail.com>

Applied and queued up for -stable, thanks.