Merge branch 'net-lan966x-flower-validate-control-flags'

Asbjørn Sloth Tønnesen says:

====================
net: lan966x: flower: validate control flags

This series adds flower control flags validation to the
lan966x 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.

v1: https://lore.kernel.org/netdev/20240423102720.228728-1-ast@fiberby.net/
====================

Link: https://lore.kernel.org/r/20240424125347.461995-1-ast@fiberby.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/microchip/lan966x/lan966x_tc_flower.c

@@ -45,6 +45,7 @@ static bool lan966x_tc_is_known_etype(struct vcap_tc_flower_parse_usage *st,
 static int
 lan966x_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 match;
 	int err = 0;
 
@@ -59,7 +60,7 @@ lan966x_tc_flower_handler_control_usage(struct vcap_tc_flower_parse_usage *st)
 						    VCAP_KF_L3_FRAGMENT,
 						    VCAP_BIT_0);
 		if (err)
-			goto out;
+			goto bad_frag_out;
 	}
 
 	if (match.mask->flags & FLOW_DIS_FIRST_FRAG) {
@@ -72,15 +73,20 @@ lan966x_tc_flower_handler_control_usage(struct vcap_tc_flower_parse_usage *st)
 						    VCAP_KF_L3_FRAG_OFS_GT0,
 						    VCAP_BIT_1);
 		if (err)
-			goto out;
+			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;
 
-out:
-	NL_SET_ERR_MSG_MOD(st->fco->common.extack, "ip_frag parse error");
+bad_frag_out:
+	NL_SET_ERR_MSG_MOD(extack, "ip_frag parse error");
 	return err;
 }