netfilter: bitwise: add helper for dumping boolean operations.

Split the code specific to dumping bitwise boolean operations out into a
separate function.  A similar function will be added later for shift
operations.
Signed-off-by: Jeremy Sowden <jeremy@azazel.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

net/netfilter/nft_bitwise.c

@@ -143,9 +143,24 @@ static int nft_bitwise_init(const struct nft_ctx *ctx,
 	return err;
 }
 
+static int nft_bitwise_dump_bool(struct sk_buff *skb,
+				 const struct nft_bitwise *priv)
+{
+	if (nft_data_dump(skb, NFTA_BITWISE_MASK, &priv->mask,
+			  NFT_DATA_VALUE, priv->len) < 0)
+		return -1;
+
+	if (nft_data_dump(skb, NFTA_BITWISE_XOR, &priv->xor,
+			  NFT_DATA_VALUE, priv->len) < 0)
+		return -1;
+
+	return 0;
+}
+
 static int nft_bitwise_dump(struct sk_buff *skb, const struct nft_expr *expr)
 {
 	const struct nft_bitwise *priv = nft_expr_priv(expr);
+	int err = 0;
 
 	if (nft_dump_register(skb, NFTA_BITWISE_SREG, priv->sreg))
 		return -1;
@@ -156,15 +171,13 @@ static int nft_bitwise_dump(struct sk_buff *skb, const struct nft_expr *expr)
 	if (nla_put_be32(skb, NFTA_BITWISE_OP, htonl(priv->op)))
 		return -1;
 
-	if (nft_data_dump(skb, NFTA_BITWISE_MASK, &priv->mask,
-			  NFT_DATA_VALUE, priv->len) < 0)
-		return -1;
-
-	if (nft_data_dump(skb, NFTA_BITWISE_XOR, &priv->xor,
-			  NFT_DATA_VALUE, priv->len) < 0)
-		return -1;
+	switch (priv->op) {
+	case NFT_BITWISE_BOOL:
+		err = nft_bitwise_dump_bool(skb, priv);
+		break;
+	}
 
-	return 0;
+	return err;
 }
 
 static struct nft_data zero;