Merge branch 'net-sparx5-flower-validate-control-flags'

Asbjørn Sloth Tønnesen says:

====================
net: sparx5: flower: validate control flags

This series adds flower control flags validation to the
sparx5 driver, and changes it from assuming that it handles
all control flags, to instead reject rules if they have
masked any unknown/unsupported control flags.
Reviewed-by: Daniel Machon <daniel.machon@microchip.com>
Tested-by: Daniel Machon <daniel.machon@microchip.com>

v1: https://lore.kernel.org/netdev/20240423102728.228765-1-ast@fiberby.net/
====================

Link: https://lore.kernel.org/r/20240424121632.459022-1-ast@fiberby.netSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/microchip/sparx5/sparx5_tc_flower.c

@@ -159,13 +159,14 @@ sparx5_tc_flower_handler_basic_usage(struct vcap_tc_flower_parse_usage *st)
 static int
 sparx5_tc_flower_handler_control_usage(struct vcap_tc_flower_parse_usage *st)
 {
+	struct netlink_ext_ack *extack = st->fco->common.extack;
 	struct flow_match_control mt;
 	u32 value, mask;
 	int err = 0;
 
 	flow_rule_match_control(st->frule, &mt);
 
-	if (mt.mask->flags) {
+	if (mt.mask->flags & (FLOW_DIS_IS_FRAGMENT | FLOW_DIS_FIRST_FRAG)) {
 		u8 is_frag_key = !!(mt.key->flags & FLOW_DIS_IS_FRAGMENT);
 		u8 is_frag_mask = !!(mt.mask->flags & FLOW_DIS_IS_FRAGMENT);
 		u8 is_frag_idx = (is_frag_key << 1) | is_frag_mask;
@@ -178,7 +179,7 @@ sparx5_tc_flower_handler_control_usage(struct vcap_tc_flower_parse_usage *st)
 		u8 vdt = sparx5_vcap_frag_map[is_frag_idx][first_frag_idx];
 
 		if (vdt == FRAG_INVAL) {
-			NL_SET_ERR_MSG_MOD(st->fco->common.extack,
+			NL_SET_ERR_MSG_MOD(extack,
 					   "Match on invalid fragment flag combination");
 			return -EINVAL;
 		}
@@ -190,16 +191,19 @@ sparx5_tc_flower_handler_control_usage(struct vcap_tc_flower_parse_usage *st)
 		err = vcap_rule_add_key_u32(st->vrule,
 					    VCAP_KF_L3_FRAGMENT_TYPE,
 					    value, mask);
-		if (err)
-			goto out;
+		if (err) {
+			NL_SET_ERR_MSG_MOD(extack, "ip_frag parse error");
+			return err;
+		}
 	}
 
-	st->used_keys |= BIT_ULL(FLOW_DISSECTOR_KEY_CONTROL);
+	if (!flow_rule_is_supp_control_flags(FLOW_DIS_IS_FRAGMENT |
+					     FLOW_DIS_FIRST_FRAG,
+					     mt.mask->flags, extack))
+		return -EOPNOTSUPP;
 
-	return err;
+	st->used_keys |= BIT_ULL(FLOW_DISSECTOR_KEY_CONTROL);
 
-out:
-	NL_SET_ERR_MSG_MOD(st->fco->common.extack, "ip_frag parse error");
 	return err;
 }