linux-kernel - [PATCH net-next v2] net: qede: flower: validate control flags

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Date: Sat, 11 May 2024 07:37:03 +0000
From: Asbjørn Sloth Tønnesen <ast@...erby.net>
To: netdev@...r.kernel.org
Cc: Asbjørn Sloth Tønnesen <ast@...erby.net>,
	linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Manish Chopra <manishc@...vell.com>
Subject: [PATCH net-next v2] net: qede: flower: validate control flags

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@...erby.net>
---

AFAICT this is the last driver which didn't validate these flags.

$ git grep FLOW_DISSECTOR_KEY_CONTROL drivers/
$ git grep 'flow_rule_.*_control_flags' drivers/

Changelog:

v2:
- rework patch, to use flow_rule_match_has_control_flags(), now that the
  driver have been converted to use extack for error reporting.

v1: https://lore.kernel.org/netdev/20240424134250.465904-1-ast@fiberby.net/

 drivers/net/ethernet/qlogic/qede/qede_filter.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/qlogic/qede/qede_filter.c b/drivers/net/ethernet/qlogic/qede/qede_filter.c
index 9c72febc6a42..985026dd816f 100644
--- a/drivers/net/ethernet/qlogic/qede/qede_filter.c
+++ b/drivers/net/ethernet/qlogic/qede/qede_filter.c
@@ -1848,6 +1848,9 @@ qede_parse_flow_attr(__be16 proto, struct flow_rule *rule,
 		return -EOPNOTSUPP;
 	}
 
+	if (flow_rule_match_has_control_flags(rule, extack))
+		return -EOPNOTSUPP;
+
 	if (proto != htons(ETH_P_IP) &&
 	    proto != htons(ETH_P_IPV6)) {
 		NL_SET_ERR_MSG_FMT_MOD(extack, "Unsupported proto=0x%x",
-- 
2.43.0