[PATCH 6.6 121/299] mptcp: use mptcp_set_state

27 Feb 2024

6.6-stable review patch.  If anyone has any objections, please let me know.
------------------
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





    

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[PATCH 6.6 121/299] mptcp: use mptcp_set_state