[PATCH net-next] net: dsa: sja1105: flower: validate control flags

From: "Asbjørn Sloth Tønnesen" <ast@fiberby.net>
To: netdev@vger.kernel.org
Cc: "Asbjørn Sloth Tønnesen" <ast@fiberby.net>,
	linux-kernel@vger.kernel.org,
	"David S. Miller" <davem@davemloft.net>,
	"Eric Dumazet" <edumazet@google.com>,
	"Jakub Kicinski" <kuba@kernel.org>,
	"Paolo Abeni" <pabeni@redhat.com>,
	"Vladimir Oltean" <vladimir.oltean@nxp.com>,
	"Andrew Lunn" <andrew@lunn.ch>,
	"Florian Fainelli" <f.fainelli@gmail.com>
Subject: [PATCH net-next] net: dsa: sja1105: flower: validate control flags
Date: Wed, 17 Apr 2024 14:44:12 +0000	[thread overview]
Message-ID: <20240417144413.104257-1-ast@fiberby.net> (raw)

This driver currently doesn't support any control flags.

Use flow_rule_match_has_control_flags() to check for control flags,
such as can be set through `tc flower ... ip_flags frag`.

In case any control flags are masked, flow_rule_match_has_control_flags()
sets a NL extended error message, and we return -EOPNOTSUPP.

Only compile-tested.

Signed-off-by: Asbjørn Sloth Tønnesen <ast@fiberby.net>
---
 drivers/net/dsa/sja1105/sja1105_flower.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/dsa/sja1105/sja1105_flower.c b/drivers/net/dsa/sja1105/sja1105_flower.c
index 9e8ca182c722..05d8ed3121e7 100644
--- a/drivers/net/dsa/sja1105/sja1105_flower.c
+++ b/drivers/net/dsa/sja1105/sja1105_flower.c
@@ -214,6 +214,9 @@ static int sja1105_flower_parse_key(struct sja1105_private *priv,
 		return -EOPNOTSUPP;
 	}
 
+	if (flow_rule_match_has_control_flags(rule, extack))
+		return -EOPNOTSUPP;
+
 	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_BASIC)) {
 		struct flow_match_basic match;
 
-- 
2.43.0

