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net: factor out __inet_listen_sk() helper

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The mptcp protocol maintains an additional socket just to easily
invoke a few stream operations on the first subflow. One of them
is inet_listen().

Factor out an helper operating directly on the (locked) struct sock,
to allow get rid of the above dependency in the next patch without
duplicating the existing code.

No functional changes intended.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Acked-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni 2023-08-11 17:57:19 +02:00 committed by David S. Miller
parent 8cf2ebdc00
commit 71a9a874cd
2 changed files with 23 additions and 16 deletions
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1
include/net/inet_common.h
View file

@ -40,6 +40,7 @@ int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
int flags);
int inet_shutdown(struct socket *sock, int how);
int inet_listen(struct socket *sock, int backlog);
int __inet_listen_sk(struct sock *sk, int backlog);
void inet_sock_destruct(struct sock *sk);
int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
int inet_bind_sk(struct sock *sk, struct sockaddr *uaddr, int addr_len);

38
net/ipv4/af_inet.c
View file

@ -187,24 +187,13 @@ static int inet_autobind(struct sock *sk)
return 0;
}
/*
* Move a socket into listening state.
*/
int inet_listen(struct socket *sock, int backlog)
int __inet_listen_sk(struct sock *sk, int backlog)
{
struct sock *sk = sock->sk;
unsigned char old_state;
unsigned char old_state = sk->sk_state;
int err, tcp_fastopen;
lock_sock(sk);
err = -EINVAL;
if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM)
goto out;
old_state = sk->sk_state;
if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN)))
goto out;
return -EINVAL;
WRITE_ONCE(sk->sk_max_ack_backlog, backlog);
/* Really, if the socket is already in listen state
@ -227,10 +216,27 @@ int inet_listen(struct socket *sock, int backlog)
err = inet_csk_listen_start(sk);
if (err)
goto out;
return err;
tcp_call_bpf(sk, BPF_SOCK_OPS_TCP_LISTEN_CB, 0, NULL);
}
err = 0;
return 0;
}
/*
* Move a socket into listening state.
*/
int inet_listen(struct socket *sock, int backlog)
{
struct sock *sk = sock->sk;
int err = -EINVAL;
lock_sock(sk);
if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM)
goto out;
err = __inet_listen_sk(sk, backlog);
out:
release_sock(sk);