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sockopt: Make SO_BINDTODEVICE readable

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The SO_BINDTODEVICE option is the only SOL_SOCKET one that can be set, but
cannot be get via sockopt API. The only way we can find the device id a
socket is bound to is via sock-diag interface. But the diag works only on
hashed sockets, while the opt in question can be set for yet unhashed one.

That said, in order to know what device a socket is bound to (we do want
to know this in checkpoint-restore project) I propose to make this option
getsockopt-able and report the respective device index.

Another solution to the problem might be to teach the sock-diag reporting
info on unhashed sockets. Should I go this way instead?

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pavel Emelyanov 2012-10-18 23:55:56 +00:00 committed by David S. Miller
parent 0da5f7c6d2
commit f7b86bfe8d
1 changed files with 3 additions and 0 deletions
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3
net/core/sock.c
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@ -1074,6 +1074,9 @@ int sock_getsockopt(struct socket *sock, int level, int optname,
case SO_NOFCS:
v.val = sock_flag(sk, SOCK_NOFCS);
break;
case SO_BINDTODEVICE:
v.val = sk->sk_bound_dev_if;
break;
default:
return -ENOPROTOOPT;
}