From c336d148adc4181f31741ae066df41429be64b67 Mon Sep 17 00:00:00 2001
From: "Eric W. Biederman" <ebiederm@xmission.com>
Date: Thu, 24 May 2012 17:56:43 -0600
Subject: [PATCH] userns: Implement sk_user_ns
Add a helper sk_user_ns to make it easy to find the user namespace
of the process that opened a socket.
Acked-by: David S. Miller <davem@davemloft.net>
Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
---
include/net/sock.h | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/include/net/sock.h b/include/net/sock.h
index 65c3d62bfa5a..9d43736a869d 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,
--
2.34.1