Patch "mptcp: add CurrEstab MIB counter support" has been added to the 6.6-stable tree

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This is a note to let you know that I've just added the patch titled

    mptcp: add CurrEstab MIB counter support

to the 6.6-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     mptcp-add-currestab-mib-counter-support.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 62b7728c7f2cf8fbb7c4c0fd8611b66e5ec79647
Author: Geliang Tang <geliang@xxxxxxxxxx>
Date:   Fri Dec 22 13:47:22 2023 +0100

    mptcp: add CurrEstab MIB counter support
    
    [ Upstream commit d9cd27b8cd191133e287e5de107f971136abe8a2 ]
    
    Add a new MIB counter named MPTCP_MIB_CURRESTAB to count current
    established MPTCP connections, similar to TCP_MIB_CURRESTAB. This is
    useful to quickly list the number of MPTCP connections without having to
    iterate over all of them.
    
    This patch adds a new helper function mptcp_set_state(): if the state
    switches from or to ESTABLISHED state, this newly added counter is
    incremented. This helper is going to be used in the following patch.
    
    Similar to MPTCP_INC_STATS(), a new helper called MPTCP_DEC_STATS() is
    also needed to decrement a MIB counter.
    
    Signed-off-by: Geliang Tang <geliang.tang@xxxxxxxxx>
    Acked-by: Paolo Abeni <pabeni@xxxxxxxxxx>
    Reviewed-by: Matthieu Baerts <matttbe@xxxxxxxxxx>
    Signed-off-by: Matthieu Baerts <matttbe@xxxxxxxxxx>
    Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
    Stable-dep-of: e4a0fa47e816 ("mptcp: corner case locking for rx path fields initialization")
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/net/mptcp/mib.c b/net/mptcp/mib.c
index a0990c365a2ea..c30405e768337 100644
--- a/net/mptcp/mib.c
+++ b/net/mptcp/mib.c
@@ -66,6 +66,7 @@ static const struct snmp_mib mptcp_snmp_list[] = {
 	SNMP_MIB_ITEM("RcvWndShared", MPTCP_MIB_RCVWNDSHARED),
 	SNMP_MIB_ITEM("RcvWndConflictUpdate", MPTCP_MIB_RCVWNDCONFLICTUPDATE),
 	SNMP_MIB_ITEM("RcvWndConflict", MPTCP_MIB_RCVWNDCONFLICT),
+	SNMP_MIB_ITEM("MPCurrEstab", MPTCP_MIB_CURRESTAB),
 	SNMP_MIB_SENTINEL
 };
 
diff --git a/net/mptcp/mib.h b/net/mptcp/mib.h
index cae71d9472529..dd7fd1f246b5f 100644
--- a/net/mptcp/mib.h
+++ b/net/mptcp/mib.h
@@ -65,6 +65,7 @@ enum linux_mptcp_mib_field {
 					 * conflict with another subflow while updating msk rcv wnd
 					 */
 	MPTCP_MIB_RCVWNDCONFLICT,	/* Conflict with while updating msk rcv wnd */
+	MPTCP_MIB_CURRESTAB,		/* Current established MPTCP connections */
 	__MPTCP_MIB_MAX
 };
 
@@ -95,4 +96,11 @@ static inline void __MPTCP_INC_STATS(struct net *net,
 		__SNMP_INC_STATS(net->mib.mptcp_statistics, field);
 }
 
+static inline void MPTCP_DEC_STATS(struct net *net,
+				   enum linux_mptcp_mib_field field)
+{
+	if (likely(net->mib.mptcp_statistics))
+		SNMP_DEC_STATS(net->mib.mptcp_statistics, field);
+}
+
 bool mptcp_mib_alloc(struct net *net);
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 9d4d5dbdbb53b..7765514451ded 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -2877,6 +2877,24 @@ void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how)
 	release_sock(ssk);
 }
 
+void mptcp_set_state(struct sock *sk, int state)
+{
+	int oldstate = sk->sk_state;
+
+	switch (state) {
+	case TCP_ESTABLISHED:
+		if (oldstate != TCP_ESTABLISHED)
+			MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_CURRESTAB);
+		break;
+
+	default:
+		if (oldstate == TCP_ESTABLISHED)
+			MPTCP_DEC_STATS(sock_net(sk), MPTCP_MIB_CURRESTAB);
+	}
+
+	inet_sk_state_store(sk, state);
+}
+
 static const unsigned char new_state[16] = {
 	/* current state:     new state:      action:	*/
 	[0 /* (Invalid) */] = TCP_CLOSE,
diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
index 094d3fd47a92f..01778ffa86be1 100644
--- a/net/mptcp/protocol.h
+++ b/net/mptcp/protocol.h
@@ -642,6 +642,7 @@ bool __mptcp_close(struct sock *sk, long timeout);
 void mptcp_cancel_work(struct sock *sk);
 void __mptcp_unaccepted_force_close(struct sock *sk);
 void mptcp_set_owner_r(struct sk_buff *skb, struct sock *sk);
+void mptcp_set_state(struct sock *sk, int state);
 
 bool mptcp_addresses_equal(const struct mptcp_addr_info *a,
 			   const struct mptcp_addr_info *b, bool use_port);




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