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