netdev - [PATCH net] ipv6: Consider sk_bound_dev_if when binding a raw socket to an address

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Date:   Mon, 20 May 2019 19:57:17 +0100
From:   Mike Manning <mmanning@...tta.att-mail.com>
To:     netdev@...r.kernel.org, dsahern@...il.com
Subject: [PATCH net] ipv6: Consider sk_bound_dev_if when binding a raw socket to an address

IPv6 does not consider if the socket is bound to a device when binding
to an address. The result is that a socket can be bound to eth0 and
then bound to the address of eth1. If the device is a VRF, the result
is that a socket can only be bound to an address in the default VRF.

Resolve by considering the device if sk_bound_dev_if is set.

Signed-off-by: Mike Manning <mmanning@...tta.att-mail.com>
---
 net/ipv6/raw.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
index 84dbe21b71e5..96a3559f2a09 100644
--- a/net/ipv6/raw.c
+++ b/net/ipv6/raw.c
@@ -287,7 +287,9 @@ static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
 			/* Binding to link-local address requires an interface */
 			if (!sk->sk_bound_dev_if)
 				goto out_unlock;
+		}
 
+		if (sk->sk_bound_dev_if) {
 			err = -ENODEV;
 			dev = dev_get_by_index_rcu(sock_net(sk),
 						   sk->sk_bound_dev_if);
-- 
2.11.0