net: hns3: 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.

Also propagate extack to hclge_get_cls_key_ip(), and convert it to
return error code.

Only compile-tested.
Signed-off-by: Asbjørn Sloth Tønnesen <ast@fiberby.net>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Tested-by: Jijie Shao <shaojijie@huawei.com>
Link: https://lore.kernel.org/r/20240422152717.175659-1-ast@fiberby.netSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c

@@ -7222,8 +7222,9 @@ static void hclge_get_cls_key_vlan(const struct flow_rule *flow,
 	}
 }
 
-static void hclge_get_cls_key_ip(const struct flow_rule *flow,
-				 struct hclge_fd_rule *rule)
+static int hclge_get_cls_key_ip(const struct flow_rule *flow,
+				struct hclge_fd_rule *rule,
+				struct netlink_ext_ack *extack)
 {
 	u16 addr_type = 0;
 
@@ -7232,6 +7233,9 @@ static void hclge_get_cls_key_ip(const struct flow_rule *flow,
 
 		flow_rule_match_control(flow, &match);
 		addr_type = match.key->addr_type;
+
+		if (flow_rule_has_control_flags(match.mask->flags, extack))
+			return -EOPNOTSUPP;
 	}
 
 	if (addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS) {
@@ -7260,6 +7264,8 @@ static void hclge_get_cls_key_ip(const struct flow_rule *flow,
 		rule->unused_tuple |= BIT(INNER_SRC_IP);
 		rule->unused_tuple |= BIT(INNER_DST_IP);
 	}
+
+	return 0;
 }
 
 static void hclge_get_cls_key_port(const struct flow_rule *flow,
@@ -7285,7 +7291,9 @@ static int hclge_parse_cls_flower(struct hclge_dev *hdev,
 				  struct hclge_fd_rule *rule)
 {
 	struct flow_rule *flow = flow_cls_offload_flow_rule(cls_flower);
+	struct netlink_ext_ack *extack = cls_flower->common.extack;
 	struct flow_dissector *dissector = flow->match.dissector;
+	int ret;
 
 	if (dissector->used_keys &
 	    ~(BIT_ULL(FLOW_DISSECTOR_KEY_CONTROL) |
@@ -7303,7 +7311,11 @@ static int hclge_parse_cls_flower(struct hclge_dev *hdev,
 	hclge_get_cls_key_basic(flow, rule);
 	hclge_get_cls_key_mac(flow, rule);
 	hclge_get_cls_key_vlan(flow, rule);
-	hclge_get_cls_key_ip(flow, rule);
+
+	ret = hclge_get_cls_key_ip(flow, rule, extack);
+	if (ret)
+		return ret;
+
 	hclge_get_cls_key_port(flow, rule);
 
 	return 0;