[PATCH 5.0 06/36] ipv6: Consider sk_bound_dev_if when binding a raw socket to an address

From: Greg Kroah-Hartman
Date: Mon Jun 03 2019 - 05:15:41 EST

From: Mike Manning <mmanning@xxxxxxxxxxxxxxxxxxx>

[ Upstream commit 72f7cfab6f93a8ea825fab8ccfb016d064269f7f ]

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@xxxxxxxxxxxxxxxxxxx>
Reviewed-by: David Ahern <dsahern@xxxxxxxxx>
Tested-by: David Ahern <dsahern@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
net/ipv6/raw.c | 2 ++
1 file changed, 2 insertions(+)

--- a/net/ipv6/raw.c
+++ b/net/ipv6/raw.c
@@ -287,7 +287,9 @@ static int rawv6_bind(struct sock *sk, s
/* 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),