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net: add an ioctl to get a socket network namespace

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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>
This commit is contained in:
Andrey Vagin
2016-10-24 18:29:13 -07:00
committed by David S. Miller
parent 2a43ca0aa9
commit c62cce2cae
4 changed files with 19 additions and 1 deletions
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2
fs/nsfs.c
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@@ -118,7 +118,7 @@ again:
return ret;
}
static int open_related_ns(struct ns_common *ns,
int open_related_ns(struct ns_common *ns,
struct ns_common *(*get_ns)(struct ns_common *ns))
{
struct path path = {};