linux-kernel - [PATCH 12/21] userns: Implement sk_user

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Message-Id: <1344889115-21610-12-git-send-email-ebiederm@xmission.com>
Date:	Mon, 13 Aug 2012 13:18:26 -0700
From:	"Eric W. Biederman" <ebiederm@...ssion.com>
To:	<netdev@...r.kernel.org>
Cc:	<linux-kernel@...r.kernel.org>,
	<containers@...ts.linux-foundation.org>,
	David Miller <davem@...emloft.net>,
	Serge Hallyn <serge@...lyn.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: [PATCH 12/21] userns: Implement sk_user_ns

From: "Eric W. Biederman" <ebiederm@...ssion.com>

Add a helper sk_user_ns to make it easy to find the user namespace
of the process that opened a socket.

Acked-by: Serge Hallyn <serge.hallyn@...onical.com>
Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
---
 include/net/sock.h |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/include/net/sock.h b/include/net/sock.h
index 65c3d62..9d43736 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -604,6 +604,15 @@ static inline void sk_add_bind_node(struct sock *sk,
 #define sk_for_each_bound(__sk, node, list) \
 	hlist_for_each_entry(__sk, node, list, sk_bind_node)
 
+static inline struct user_namespace *sk_user_ns(struct sock *sk)
+{
+	/* Careful only use this in a context where these parameters
+	 * can not change and must all be valid, such as recvmsg from
+	 * userspace.
+	 */
+	return sk->sk_socket->file->f_cred->user_ns;
+}
+
 /* Sock flags */
 enum sock_flags {
 	SOCK_DEAD,
-- 
1.7.5.4

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