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

    mptcp: update local address flags when setting it

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-update-local-address-flags-when-setting-it.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@vger.kernel.org> know about it.


From stable+bounces-93824-greg=kroah.com@vger.kernel.org Mon Nov 18 19:27:52 2024
From: "Matthieu Baerts (NGI0)" <matttbe@kernel.org>
Date: Mon, 18 Nov 2024 19:27:21 +0100
Subject: mptcp: update local address flags when setting it
To: mptcp@lists.linux.dev, stable@vger.kernel.org, gregkh@linuxfoundation.org
Cc: Geliang Tang <tanggeliang@kylinos.cn>, sashal@kernel.org, Matthieu Baerts <matttbe@kernel.org>, Jakub Kicinski <kuba@kernel.org>
Message-ID: <20241118182718.3011097-11-matttbe@kernel.org>

From: Geliang Tang <tanggeliang@kylinos.cn>

commit e0266319413d5d687ba7b6df7ca99e4b9724a4f2 upstream.

Just like in-kernel pm, when userspace pm does set_flags, it needs to send
out MP_PRIO signal, and also modify the flags of the corresponding address
entry in the local address list. This patch implements the missing logic.

Traverse all address entries on userspace_pm_local_addr_list to find the
local address entry, if bkup is true, set the flags of this entry with
FLAG_BACKUP, otherwise, clear FLAG_BACKUP.

Fixes: 892f396c8e68 ("mptcp: netlink: issue MP_PRIO signals from userspace PMs")
Cc: stable@vger.kernel.org
Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Link: https://patch.msgid.link/20241112-net-mptcp-misc-6-12-pm-v1-1-b835580cefa8@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
[ Conflicts in pm_userspace.c, because commit 6a42477fe449 ("mptcp:
  update set_flags interfaces"), is not in this version, and causes too
  many conflicts when backporting it. The same code can still be added
  at the same place, before sending the ACK. ]
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/mptcp/pm_userspace.c |   12 ++++++++++++
 1 file changed, 12 insertions(+)

--- a/net/mptcp/pm_userspace.c
+++ b/net/mptcp/pm_userspace.c
@@ -563,6 +563,7 @@ int mptcp_userspace_pm_set_flags(struct
 				 struct mptcp_pm_addr_entry *loc,
 				 struct mptcp_pm_addr_entry *rem, u8 bkup)
 {
+	struct mptcp_pm_addr_entry *entry;
 	struct mptcp_sock *msk;
 	int ret = -EINVAL;
 	struct sock *sk;
@@ -583,6 +584,17 @@ int mptcp_userspace_pm_set_flags(struct
 	    rem->addr.family == AF_UNSPEC)
 		goto set_flags_err;
 
+	spin_lock_bh(&msk->pm.lock);
+	list_for_each_entry(entry, &msk->pm.userspace_pm_local_addr_list, list) {
+		if (mptcp_addresses_equal(&entry->addr, &loc->addr, false)) {
+			if (bkup)
+				entry->flags |= MPTCP_PM_ADDR_FLAG_BACKUP;
+			else
+				entry->flags &= ~MPTCP_PM_ADDR_FLAG_BACKUP;
+		}
+	}
+	spin_unlock_bh(&msk->pm.lock);
+
 	lock_sock(sk);
 	ret = mptcp_pm_nl_mp_prio_send_ack(msk, &loc->addr, &rem->addr, bkup);
 	release_sock(sk);


Patches currently in stable-queue which might be from matttbe@kernel.org are

queue-6.6/mptcp-pm-use-_rcu-variant-under-rcu_read_lock.patch
queue-6.6/mptcp-error-out-earlier-on-disconnect.patch
queue-6.6/mptcp-hold-pm-lock-when-deleting-entry.patch
queue-6.6/mptcp-cope-racing-subflow-creation-in-mptcp_rcv_spac.patch
queue-6.6/mptcp-drop-lookup_by_id-in-lookup_addr.patch
queue-6.6/mptcp-add-userspace_pm_lookup_addr_by_id-helper.patch
queue-6.6/mptcp-define-more-local-variables-sk.patch
queue-6.6/mptcp-update-local-address-flags-when-setting-it.patch