[PATCH 6.6 121/299] mptcp: use mptcp_set_state

Greg Kroah-Hartman
2024-02-27T13:52:19Z

From: Geliang Tang <geliang.tang@linux.dev>

[ Upstream commit c693a8516429908da3ea111b0caa3c042ab1e6e9 ]

This patch replaces all the 'inet_sk_state_store()' calls under net/mptcp
with the new helper mptcp_set_state().

Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/460
Signed-off-by: Geliang Tang <geliang.tang@linux.dev>
Acked-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Matthieu Baerts <matttbe@kernel.org>
Signed-off-by: Matthieu Baerts <matttbe@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Stable-dep-of: e4a0fa47e816 ("mptcp: corner case locking for rx path fields initialization")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/mptcp/pm_netlink.c | 5 +++++
net/mptcp/protocol.c | 38 +++++++++++++++++++-------------------
net/mptcp/subflow.c | 2 +-
3 files changed, 25 insertions(+), 20 deletions(-)

diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c
index 3011bc378462b..44c0e96210a46 100644
--- a/net/mptcp/pm_netlink.c
+++ b/net/mptcp/pm_netlink.c
@@ -1048,6 +1048,11 @@ static int mptcp_pm_nl_create_listen_socket(struct sock *sk,
if (err)
return err;

+ /* We don't use mptcp_set_state() here because it needs to be called
+ * under the msk socket lock. For the moment, that will not bring
+ * anything more than only calling inet_sk_state_store(), because the
+ * old status is known (TCP_CLOSE).
+ */
inet_sk_state_store(newsk, TCP_LISTEN);
lock_sock(ssk);
err = __inet_listen_sk(ssk, backlog);
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 7765514451ded..2f794924ae5d4 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -445,11 +445,11 @@ static void mptcp_check_data_fin_ack(struct sock *sk)

switch (sk->sk_state) {
case TCP_FIN_WAIT1:
- inet_sk_state_store(sk, TCP_FIN_WAIT2);
+ mptcp_set_state(sk, TCP_FIN_WAIT2);
break;
case TCP_CLOSING:
case TCP_LAST_ACK:
- inet_sk_state_store(sk, TCP_CLOSE);
+ mptcp_set_state(sk, TCP_CLOSE);
break;
}

@@ -610,13 +610,13 @@ static bool mptcp_check_data_fin(struct sock *sk)

switch (sk->sk_state) {
case TCP_ESTABLISHED:
- inet_sk_state_store(sk, TCP_CLOSE_WAIT);
+ mptcp_set_state(sk, TCP_CLOSE_WAIT);
break;
case TCP_FIN_WAIT1:
- inet_sk_state_store(sk, TCP_CLOSING);
+ mptcp_set_state(sk, TCP_CLOSING);
break;
case TCP_FIN_WAIT2:
- inet_sk_state_store(sk, TCP_CLOSE);
+ mptcp_set_state(sk, TCP_CLOSE);
break;
default:
/* Other states not expected */
@@ -791,7 +791,7 @@ static bool __mptcp_subflow_error_report(struct sock *sk, struct sock *ssk)
*/
ssk_state = inet_sk_state_load(ssk);
if (ssk_state == TCP_CLOSE && !sock_flag(sk, SOCK_DEAD))
- inet_sk_state_store(sk, ssk_state);
+ mptcp_set_state(sk, ssk_state);
WRITE_ONCE(sk->sk_err, -err);

/* This barrier is coupled with smp_rmb() in mptcp_poll() */
@@ -2470,7 +2470,7 @@ static void __mptcp_close_ssk(struct sock *sk, struct sock *ssk,
inet_sk_state_load(msk->first) == TCP_CLOSE) {
if (sk->sk_state != TCP_ESTABLISHED ||
msk->in_accept_queue || sock_flag(sk, SOCK_DEAD)) {
- inet_sk_state_store(sk, TCP_CLOSE);
+ mptcp_set_state(sk, TCP_CLOSE);
mptcp_close_wake_up(sk);
} else {
mptcp_start_tout_timer(sk);
@@ -2565,7 +2565,7 @@ static void mptcp_check_fastclose(struct mptcp_sock *msk)
WRITE_ONCE(sk->sk_err, ECONNRESET);
}

- inet_sk_state_store(sk, TCP_CLOSE);
+ mptcp_set_state(sk, TCP_CLOSE);
WRITE_ONCE(sk->sk_shutdown, SHUTDOWN_MASK);
smp_mb__before_atomic(); /* SHUTDOWN must be visible first */
set_bit(MPTCP_WORK_CLOSE_SUBFLOW, &msk->flags);
@@ -2700,7 +2700,7 @@ static void mptcp_do_fastclose(struct sock *sk)
struct mptcp_subflow_context *subflow, *tmp;
struct mptcp_sock *msk = mptcp_sk(sk);

- inet_sk_state_store(sk, TCP_CLOSE);
+ mptcp_set_state(sk, TCP_CLOSE);
mptcp_for_each_subflow_safe(msk, subflow, tmp)
__mptcp_close_ssk(sk, mptcp_subflow_tcp_sock(subflow),
subflow, MPTCP_CF_FASTCLOSE);
@@ -2917,7 +2917,7 @@ static int mptcp_close_state(struct sock *sk)
int next = (int)new_state[sk->sk_state];
int ns = next & TCP_STATE_MASK;

- inet_sk_state_store(sk, ns);
+ mptcp_set_state(sk, ns);

return next & TCP_ACTION_FIN;
}
@@ -3035,7 +3035,7 @@ bool __mptcp_close(struct sock *sk, long timeout)

if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) {
mptcp_check_listen_stop(sk);
- inet_sk_state_store(sk, TCP_CLOSE);
+ mptcp_set_state(sk, TCP_CLOSE);
goto cleanup;
}

@@ -3078,7 +3078,7 @@ bool __mptcp_close(struct sock *sk, long timeout)
* state, let's not keep resources busy for no reasons
*/
if (subflows_alive == 0)
- inet_sk_state_store(sk, TCP_CLOSE);
+ mptcp_set_state(sk, TCP_CLOSE);

sock_hold(sk);
pr_debug("msk=%p state=%d", sk, sk->sk_state);
@@ -3144,7 +3144,7 @@ static int mptcp_disconnect(struct sock *sk, int flags)
return -EBUSY;

mptcp_check_listen_stop(sk);
- inet_sk_state_store(sk, TCP_CLOSE);
+ mptcp_set_state(sk, TCP_CLOSE);

mptcp_stop_rtx_timer(sk);
mptcp_stop_tout_timer(sk);
@@ -3231,7 +3231,7 @@ struct sock *mptcp_sk_clone_init(const struct sock *sk,
/* this can't race with mptcp_close(), as the msk is
* not yet exposted to user-space
*/
- inet_sk_state_store(nsk, TCP_ESTABLISHED);
+ mptcp_set_state(nsk, TCP_ESTABLISHED);

/* The msk maintain a ref to each subflow in the connections list */
WRITE_ONCE(msk->first, ssk);
@@ -3686,7 +3686,7 @@ static int mptcp_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
if (IS_ERR(ssk))
return PTR_ERR(ssk);

- inet_sk_state_store(sk, TCP_SYN_SENT);
+ mptcp_set_state(sk, TCP_SYN_SENT);
subflow = mptcp_subflow_ctx(ssk);
#ifdef CONFIG_TCP_MD5SIG
/* no MPTCP if MD5SIG is enabled on this socket or we may run out of
@@ -3736,7 +3736,7 @@ static int mptcp_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
if (unlikely(err)) {
/* avoid leaving a dangling token in an unconnected socket */
mptcp_token_destroy(msk);
- inet_sk_state_store(sk, TCP_CLOSE);
+ mptcp_set_state(sk, TCP_CLOSE);
return err;
}

@@ -3826,13 +3826,13 @@ static int mptcp_listen(struct socket *sock, int backlog)
goto unlock;
}

- inet_sk_state_store(sk, TCP_LISTEN);
+ mptcp_set_state(sk, TCP_LISTEN);
sock_set_flag(sk, SOCK_RCU_FREE);

lock_sock(ssk);
err = __inet_listen_sk(ssk, backlog);
release_sock(ssk);
- inet_sk_state_store(sk, inet_sk_state_load(ssk));
+ mptcp_set_state(sk, inet_sk_state_load(ssk));

if (!err) {
sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
@@ -3892,7 +3892,7 @@ static int mptcp_stream_accept(struct socket *sock, struct socket *newsock,
__mptcp_close_ssk(newsk, msk->first,
mptcp_subflow_ctx(msk->first), 0);
if (unlikely(list_is_singular(&msk->conn_list)))
- inet_sk_state_store(newsk, TCP_CLOSE);
+ mptcp_set_state(newsk, TCP_CLOSE);
}
}
release_sock(newsk);
diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c
index 8c7e22a9a37bd..15f456fb28977 100644
--- a/net/mptcp/subflow.c
+++ b/net/mptcp/subflow.c
@@ -427,7 +427,7 @@ void __mptcp_sync_state(struct sock *sk, int state)
if (!msk->rcvspace_init)
mptcp_rcv_space_init(msk, msk->first);
if (sk->sk_state == TCP_SYN_SENT) {
- inet_sk_state_store(sk, state);
+ mptcp_set_state(sk, state);
sk->sk_state_change(sk);
}
}
--
2.43.0