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af_unix: Add OOB support

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This patch adds OOB support for AF_UNIX sockets.
The semantics is same as TCP.

The last byte of a message with the OOB flag is
treated as the OOB byte. The byte is separated into
a skb and a pointer to the skb is stored in unix_sock.
The pointer is used to enforce OOB semantics.

Signed-off-by: Rao Shoaib <rao.shoaib@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Rao Shoaib 2021-08-01 00:57:07 -07:00 • committed by David S. Miller
parent 7e89350c90
commit 314001f0bf
6 changed files with 602 additions and 2 deletions
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3
include/net/af_unix.h
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@ -70,6 +70,9 @@ struct unix_sock {
struct socket_wq peer_wq;
wait_queue_entry_t peer_wake;
struct scm_stat scm_stat;
#if IS_ENABLED(CONFIG_AF_UNIX_OOB)
struct sk_buff *oob_skb;
#endif
};
static inline struct unix_sock *unix_sk(const struct sock *sk)