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From: =?UTF-8?q?Asbj=C3=B8rn=20Sloth=20T=C3=B8nnesen?= <ast@fiberby.net>
To: netdev@vger.kernel.org
Cc: =?UTF-8?q?Asbj=C3=B8rn=20Sloth=20T=C3=B8nnesen?= <ast@fiberby.net>,
	Horatiu Vultur <horatiu.vultur@microchip.com>,
	UNGLinuxDriver@microchip.com,
	"David S. Miller" <davem@davemloft.net>,
	Eric Dumazet <edumazet@google.com>,
	Jakub Kicinski <kuba@kernel.org>,
	Paolo Abeni <pabeni@redhat.com>,
	linux-kernel@vger.kernel.org
Subject: [PATCH net-next 2/2] net: lan966x: flower: check for unsupported control flags
Date: Tue, 23 Apr 2024 10:27:18 +0000
Message-ID: <20240423102720.228728-2-ast@fiberby.net>
In-Reply-To: <20240423102720.228728-1-ast@fiberby.net>
References: <20240423102720.228728-1-ast@fiberby.net>
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Use flow_rule_is_supp_control_flags() to reject filters with
unsupported control flags.

In case any unsupported control flags are masked,
flow_rule_is_supp_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/ethernet/microchip/lan966x/lan966x_tc_flower.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_tc_flower.c b/drivers/net/ethernet/microchip/lan966x/lan966x_tc_flower.c
index 8baec0cd8d95..43913d6204e1 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_tc_flower.c
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_tc_flower.c
@@ -76,6 +76,11 @@ lan966x_tc_flower_handler_control_usage(struct vcap_tc_flower_parse_usage *st)
 			goto bad_frag_out;
 	}
 
+	if (!flow_rule_is_supp_control_flags(FLOW_DIS_IS_FRAGMENT |
+					     FLOW_DIS_FIRST_FRAG,
+					     match.mask->flags, extack))
+		return -EOPNOTSUPP;
+
 	st->used_keys |= BIT_ULL(FLOW_DISSECTOR_KEY_CONTROL);
 
 	return err;
-- 
2.43.0