net/sched: cls_flower: prepare fl_{set,dump}_key_flags() for ENC_FLAGS

Prepare fl_set_key_flags/fl_dump_key_flags() for use with
TCA_FLOWER_KEY_ENC_FLAGS{,_MASK}.

This patch adds an encap argument, similar to fl_set_key_ip/
fl_dump_key_ip(), and determine the flower keys based on the
encap argument, and use them in the rest of the two functions.

Since these functions are so far, only called with encap set false,
then there is no functional change.

Signed-off-by: Asbjørn Sloth Tønnesen <ast@fiberby.net>
Tested-by: Davide Caratti <dcaratti@redhat.com>
Reviewed-by: Davide Caratti <dcaratti@redhat.com>
Link: https://patch.msgid.link/20240713021911.1631517-5-ast@fiberby.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: Asbjørn Sloth Tønnesen

net/sched/cls_flower.c

@@ -1166,19 +1166,28 @@ static void fl_set_key_flag(u32 flower_key, u32 flower_mask,
 	}
 }
 
-static int fl_set_key_flags(struct nlattr **tb, u32 *flags_key,
+static int fl_set_key_flags(struct nlattr **tb, bool encap, u32 *flags_key,
 			    u32 *flags_mask, struct netlink_ext_ack *extack)
 {
+	int fl_key, fl_mask;
 	u32 key, mask;
 
+	if (encap) {
+		fl_key = TCA_FLOWER_KEY_ENC_FLAGS;
+		fl_mask = TCA_FLOWER_KEY_ENC_FLAGS_MASK;
+	} else {
+		fl_key = TCA_FLOWER_KEY_FLAGS;
+		fl_mask = TCA_FLOWER_KEY_FLAGS_MASK;
+	}
+
 	/* mask is mandatory for flags */
-	if (!tb[TCA_FLOWER_KEY_FLAGS_MASK]) {
+	if (NL_REQ_ATTR_CHECK(extack, NULL, tb, fl_mask)) {
 		NL_SET_ERR_MSG(extack, "Missing flags mask");
 		return -EINVAL;
 	}
 
-	key = be32_to_cpu(nla_get_be32(tb[TCA_FLOWER_KEY_FLAGS]));
-	mask = be32_to_cpu(nla_get_be32(tb[TCA_FLOWER_KEY_FLAGS_MASK]));
+	key = be32_to_cpu(nla_get_be32(tb[fl_key]));
+	mask = be32_to_cpu(nla_get_be32(tb[fl_mask]));
 
 	*flags_key  = 0;
 	*flags_mask = 0;
@@ -2086,7 +2095,7 @@ static int fl_set_key(struct net *net, struct nlattr **tb,
 		return ret;
 
 	if (tb[TCA_FLOWER_KEY_FLAGS]) {
-		ret = fl_set_key_flags(tb, &key->control.flags,
+		ret = fl_set_key_flags(tb, false, &key->control.flags,
 				       &mask->control.flags, extack);
 		if (ret)
 			return ret;
@@ -3084,12 +3093,22 @@ static void fl_get_key_flag(u32 dissector_key, u32 dissector_mask,
 	}
 }
 
-static int fl_dump_key_flags(struct sk_buff *skb, u32 flags_key, u32 flags_mask)
+static int fl_dump_key_flags(struct sk_buff *skb, bool encap,
+			     u32 flags_key, u32 flags_mask)
 {
-	u32 key, mask;
+	int fl_key, fl_mask;
 	__be32 _key, _mask;
+	u32 key, mask;
 	int err;
 
+	if (encap) {
+		fl_key = TCA_FLOWER_KEY_ENC_FLAGS;
+		fl_mask = TCA_FLOWER_KEY_ENC_FLAGS_MASK;
+	} else {
+		fl_key = TCA_FLOWER_KEY_FLAGS;
+		fl_mask = TCA_FLOWER_KEY_FLAGS_MASK;
+	}
+
 	if (!memchr_inv(&flags_mask, 0, sizeof(flags_mask)))
 		return 0;
 
@@ -3105,11 +3124,11 @@ static int fl_dump_key_flags(struct sk_buff *skb, u32 flags_key, u32 flags_mask)
 	_key = cpu_to_be32(key);
 	_mask = cpu_to_be32(mask);
 
-	err = nla_put(skb, TCA_FLOWER_KEY_FLAGS, 4, &_key);
+	err = nla_put(skb, fl_key, 4, &_key);
 	if (err)
 		return err;
 
-	return nla_put(skb, TCA_FLOWER_KEY_FLAGS_MASK, 4, &_mask);
+	return nla_put(skb, fl_mask, 4, &_mask);
 }
 
 static int fl_dump_key_geneve_opt(struct sk_buff *skb,
@@ -3632,7 +3651,8 @@ static int fl_dump_key(struct sk_buff *skb, struct net *net,
 	if (fl_dump_key_ct(skb, &key->ct, &mask->ct))
 		goto nla_put_failure;
 
-	if (fl_dump_key_flags(skb, key->control.flags, mask->control.flags))
+	if (fl_dump_key_flags(skb, false, key->control.flags,
+			      mask->control.flags))
 		goto nla_put_failure;
 
 	if (fl_dump_key_val(skb, &key->hash.hash, TCA_FLOWER_KEY_HASH,