net: ethernet: mtk_eth_soc: flower: validate control flags

This driver currently doesn't support any control flags.

Use flow_rule_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_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>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/r/20240418161821.189263-1-ast@fiberby.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/mediatek/mtk_ppe_offload.c b/drivers/net/ethernet/mediatek/mtk_ppe_offload.c
index fbb5e9d5af13163670c7dce34fc9ea4ae92500b8..aa262e6f4b85ae4aa09ab048fd9c97a29fbf4102 100644 (file)
--- a/drivers/net/ethernet/mediatek/mtk_ppe_offload.c
+++ b/drivers/net/ethernet/mediatek/mtk_ppe_offload.c
@@ -273,6 +273,10 @@ mtk_flow_offload_replace(struct mtk_eth *eth, struct flow_cls_offload *f,
 
                flow_rule_match_control(rule, &match);
                addr_type = match.key->addr_type;
+
+               if (flow_rule_has_control_flags(match.mask->flags,
+                                               f->common.extack))
+                       return -EOPNOTSUPP;
        } else {
                return -EOPNOTSUPP;
        }