tree f652d443eb8394c24772bcee4cf15f3a1a6586f1
parent 2a43ca0aa9084c41aaa1006fbf22155b2e94babf
author Andrey Vagin <avagin@openvz.org> 1477358953 -0700
committer David S. Miller <davem@davemloft.net> 1477925796 -0400

net: add an ioctl to get a socket network namespace

Each socket operates in a network namespace where it has been created,
so if we want to dump and restore a socket, we have to know its network
namespace.

We have a socket_diag to get information about sockets, it doesn't
report sockets which are not bound or connected.

This patch introduces a new socket ioctl, which is called SIOCGSKNS
and used to get a file descriptor for a socket network namespace.

A task must have CAP_NET_ADMIN in a target network namespace to
use this ioctl.

Cc: "David S. Miller" <davem@davemloft.net>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Andrei Vagin <avagin@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>