[PATCH 5.10.y] mptcp: fix NL PM announced address accounting

[PATCH 5.10.y] mptcp: fix NL PM announced address accounting

[Matthieu Baerts (NGI0)]

From: Paolo Abeni <pabeni@redhat.com>

commit 4b317e0eb287bd30a1b329513531157c25e8b692 upstream.

Currently the per connection announced address counter is never
decreased. As a consequence, after connection establishment, if
the NL PM deletes an endpoint and adds a new/different one, no
additional subflow is created for the new endpoint even if the
current limits allow that.

Address the issue properly updating the signaled address counter
every time the NL PM removes such addresses.

Fixes: 01cacb00b35c ("mptcp: add netlink-based PM")
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
[ Conflicts in pm_netlink.c, because the commit 06faa2271034 ("mptcp:
  remove multi addresses and subflows in PM") is not in this version.
  Only the modification in mptcp_pm_remove_anno_addr() is then needed. ]
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
---
 net/mptcp/pm_netlink.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c
index 452c7e21befd..7f4d84f5189b 100644
--- a/net/mptcp/pm_netlink.c
+++ b/net/mptcp/pm_netlink.c
@@ -759,6 +759,7 @@ static bool mptcp_pm_remove_anno_addr(struct mptcp_sock *msk,
 	ret = remove_anno_list_by_saddr(msk, addr);
 	if (ret || force) {
 		spin_lock_bh(&msk->pm.lock);
+		msk->pm.add_addr_signaled -= ret;
 		mptcp_pm_remove_addr(msk, addr->id);
 		spin_unlock_bh(&msk->pm.lock);
 	}
-- 
2.45.2

Patch "mptcp: fix NL PM announced address accounting" has been added to the 5.10-stable tree

[gregkh]

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

    mptcp: fix NL PM announced address accounting

to the 5.10-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-fix-nl-pm-announced-address-accounting.patch
and it can be found in the queue-5.10 subdirectory.

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


From stable+bounces-66251-greg=kroah.com@vger.kernel.org Fri Aug  9 12:55:06 2024
From: "Matthieu Baerts (NGI0)" <matttbe@kernel.org>
Date: Fri,  9 Aug 2024 12:54:50 +0200
Subject: mptcp: fix NL PM announced address accounting
To: stable@vger.kernel.org, gregkh@linuxfoundation.org
Cc: MPTCP Upstream <mptcp@lists.linux.dev>, Paolo Abeni <pabeni@redhat.com>, Matthieu Baerts <matttbe@kernel.org>, "David S . Miller" <davem@davemloft.net>
Message-ID: <20240809105449.2902071-2-matttbe@kernel.org>

From: Paolo Abeni <pabeni@redhat.com>

commit 4b317e0eb287bd30a1b329513531157c25e8b692 upstream.

Currently the per connection announced address counter is never
decreased. As a consequence, after connection establishment, if
the NL PM deletes an endpoint and adds a new/different one, no
additional subflow is created for the new endpoint even if the
current limits allow that.

Address the issue properly updating the signaled address counter
every time the NL PM removes such addresses.

Fixes: 01cacb00b35c ("mptcp: add netlink-based PM")
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
[ Conflicts in pm_netlink.c, because the commit 06faa2271034 ("mptcp:
  remove multi addresses and subflows in PM") is not in this version.
  Only the modification in mptcp_pm_remove_anno_addr() is then needed. ]
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/mptcp/pm_netlink.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/mptcp/pm_netlink.c
+++ b/net/mptcp/pm_netlink.c
@@ -759,6 +759,7 @@ static bool mptcp_pm_remove_anno_addr(st
 	ret = remove_anno_list_by_saddr(msk, addr);
 	if (ret || force) {
 		spin_lock_bh(&msk->pm.lock);
+		msk->pm.add_addr_signaled -= ret;
 		mptcp_pm_remove_addr(msk, addr->id);
 		spin_unlock_bh(&msk->pm.lock);
 	}


Patches currently in stable-queue which might be from kroah.com@vger.kernel.org are

queue-5.10/mptcp-fix-nl-pm-announced-address-accounting.patch
queue-5.10/mptcp-distinguish-rcv-vs-sent-backup-flag-in-requests.patch
queue-5.10/mptcp-pm-fix-backup-support-in-signal-endpoints.patch
queue-5.10/mptcp-mib-count-mpj-with-backup-flag.patch
queue-5.10/mptcp-sched-check-both-directions-for-backup.patch
queue-5.10/mptcp-export-local_address.patch