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af_unix: Add read_sock for stream socket types 

To support sockmap for af_unix stream type, implement
read_sock, which is similar to the read_sock for unix
dgram sockets.

Signed-off-by: Jiang Wang <jiang.wang@bytedance.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Reviewed-by: Cong Wang <cong.wang@bytedance.com>
Acked-by: Jakub Sitnicki <jakub@cloudflare.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20210816190327.2739291-2-jiang.wang@bytedance.com
This commit is contained in:
Jiang Wang 2021-08-16 19:03:20 +00:00 committed by Andrii Nakryiko
parent edce1a2486
commit 77462de14a
1 changed files with 12 additions and 0 deletions
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12
net/unix/af_unix.c
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@ -679,6 +679,8 @@ static int unix_dgram_sendmsg(struct socket *, struct msghdr *, size_t);
static int unix_dgram_recvmsg(struct socket *, struct msghdr *, size_t, int);
static int unix_read_sock(struct sock *sk, read_descriptor_t *desc,
sk_read_actor_t recv_actor);
static int unix_stream_read_sock(struct sock *sk, read_descriptor_t *desc,
sk_read_actor_t recv_actor);
static int unix_dgram_connect(struct socket *, struct sockaddr *,
int, int);
static int unix_seqpacket_sendmsg(struct socket *, struct msghdr *, size_t);
@ -732,6 +734,7 @@ static const struct proto_ops unix_stream_ops = {
.shutdown = unix_shutdown,
.sendmsg = unix_stream_sendmsg,
.recvmsg = unix_stream_recvmsg,
.read_sock = unix_stream_read_sock,
.mmap = sock_no_mmap,
.sendpage = unix_stream_sendpage,
.splice_read = unix_stream_splice_read,
@ -2491,6 +2494,15 @@ static struct sk_buff *manage_oob(struct sk_buff *skb, struct sock *sk,
}
#endif
static int unix_stream_read_sock(struct sock *sk, read_descriptor_t *desc,
sk_read_actor_t recv_actor)
{
if (unlikely(sk->sk_state != TCP_ESTABLISHED))
return -ENOTCONN;
return unix_read_sock(sk, desc, recv_actor);
}
static int unix_stream_read_generic(struct unix_stream_read_state *state,
bool freezable)
{