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

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Message-ID: <cb377c80-b40c-8fa4-c20c-d7b6454d6c7a@ralfj.de>
Date:   Thu, 3 Jan 2019 23:22:36 +0100
From:   Ralf Jung <post@...fj.de>
To:     David Ahern <dsahern@...nel.org>, davem@...emloft.net
Cc:     netdev@...r.kernel.org, David Ahern <dsahern@...il.com>
Subject: Re: [PATCH net] ipv6: Consider sk_bound_dev_if when binding a socket
 to an address

Hi all,

thanks a lot!  I can confirm that this fixes my test script.

Kind regards,
Ralf

On 03.01.19 03:57, David Ahern wrote:
> From: David Ahern <dsahern@...il.com>
> 
> 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.
> 
> This problem exists from the beginning of git history.
> 
> Signed-off-by: David Ahern <dsahern@...il.com>
> ---
>  net/ipv6/af_inet6.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
> index f0cd291034f0..0bfb6cc0a30a 100644
> --- a/net/ipv6/af_inet6.c
> +++ b/net/ipv6/af_inet6.c
> @@ -350,6 +350,9 @@ static int __inet6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
>  					err = -EINVAL;
>  					goto out_unlock;
>  				}
> +			}
> +
> +			if (sk->sk_bound_dev_if) {
>  				dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
>  				if (!dev) {
>  					err = -ENODEV;
>