linux-kernel - [PATCH AUTOSEL 6.14 498/642] mptcp: pm: userspace: flags: clearer msg if no remote addr

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Message-Id: <20250505221419.2672473-498-sashal@kernel.org>
Date: Mon,  5 May 2025 18:11:54 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: "Matthieu Baerts (NGI0)" <matttbe@...nel.org>,
	Geliang Tang <geliang@...nel.org>,
	Simon Horman <horms@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Sasha Levin <sashal@...nel.org>,
	martineau@...nel.org,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	netdev@...r.kernel.org,
	mptcp@...ts.linux.dev
Subject: [PATCH AUTOSEL 6.14 498/642] mptcp: pm: userspace: flags: clearer msg if no remote addr

From: "Matthieu Baerts (NGI0)" <matttbe@...nel.org>

[ Upstream commit 58b21309f97b08b6b9814d1ee1419249eba9ef08 ]

Since its introduction in commit 892f396c8e68 ("mptcp: netlink: issue
MP_PRIO signals from userspace PMs"), it was mandatory to specify the
remote address, because of the 'if (rem->addr.family == AF_UNSPEC)'
check done later one.

In theory, this attribute can be optional, but it sounds better to be
precise to avoid sending the MP_PRIO on the wrong subflow, e.g. if there
are multiple subflows attached to the same local ID. This can be relaxed
later on if there is a need to act on multiple subflows with one
command.

For the moment, the check to see if attr_rem is NULL can be removed,
because mptcp_pm_parse_entry() will do this check as well, no need to do
that differently here.

Reviewed-by: Geliang Tang <geliang@...nel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@...nel.org>
Reviewed-by: Simon Horman <horms@...nel.org>
Signed-off-by: Paolo Abeni <pabeni@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/mptcp/pm_userspace.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/net/mptcp/pm_userspace.c b/net/mptcp/pm_userspace.c
index 940ca94c88634..cd220742d2493 100644
--- a/net/mptcp/pm_userspace.c
+++ b/net/mptcp/pm_userspace.c
@@ -583,11 +583,9 @@ int mptcp_userspace_pm_set_flags(struct sk_buff *skb, struct genl_info *info)
 	if (ret < 0)
 		goto set_flags_err;
 
-	if (attr_rem) {
-		ret = mptcp_pm_parse_entry(attr_rem, info, false, &rem);
-		if (ret < 0)
-			goto set_flags_err;
-	}
+	ret = mptcp_pm_parse_entry(attr_rem, info, false, &rem);
+	if (ret < 0)
+		goto set_flags_err;
 
 	if (loc.addr.family == AF_UNSPEC ||
 	    rem.addr.family == AF_UNSPEC) {
-- 
2.39.5