netfilter: nft_reject: unify reject init and dump into nft_reject

Bridge family is using the same static init and dump function as inet.

This patch removes duplicate code unifying these functions body into
nft_reject.c so they can be reused in the rest of families supporting
reject verdict.
Signed-off-by: Jose M. Guisado Gomez <guigom@riseup.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

net/bridge/netfilter/nft_reject_bridge.c

@@ -177,69 +177,13 @@ static int nft_reject_bridge_validate(const struct nft_ctx *ctx,
 						    (1 << NF_BR_LOCAL_IN));
 }
 
-static int nft_reject_bridge_init(const struct nft_ctx *ctx,
-				  const struct nft_expr *expr,
-				  const struct nlattr * const tb[])
-{
-	struct nft_reject *priv = nft_expr_priv(expr);
-	int icmp_code;
-
-	if (tb[NFTA_REJECT_TYPE] == NULL)
-		return -EINVAL;
-
-	priv->type = ntohl(nla_get_be32(tb[NFTA_REJECT_TYPE]));
-	switch (priv->type) {
-	case NFT_REJECT_ICMP_UNREACH:
-	case NFT_REJECT_ICMPX_UNREACH:
-		if (tb[NFTA_REJECT_ICMP_CODE] == NULL)
-			return -EINVAL;
-
-		icmp_code = nla_get_u8(tb[NFTA_REJECT_ICMP_CODE]);
-		if (priv->type == NFT_REJECT_ICMPX_UNREACH &&
-		    icmp_code > NFT_REJECT_ICMPX_MAX)
-			return -EINVAL;
-
-		priv->icmp_code = icmp_code;
-		break;
-	case NFT_REJECT_TCP_RST:
-		break;
-	default:
-		return -EINVAL;
-	}
-	return 0;
-}
-
-static int nft_reject_bridge_dump(struct sk_buff *skb,
-				  const struct nft_expr *expr)
-{
-	const struct nft_reject *priv = nft_expr_priv(expr);
-
-	if (nla_put_be32(skb, NFTA_REJECT_TYPE, htonl(priv->type)))
-		goto nla_put_failure;
-
-	switch (priv->type) {
-	case NFT_REJECT_ICMP_UNREACH:
-	case NFT_REJECT_ICMPX_UNREACH:
-		if (nla_put_u8(skb, NFTA_REJECT_ICMP_CODE, priv->icmp_code))
-			goto nla_put_failure;
-		break;
-	default:
-		break;
-	}
-
-	return 0;
-
-nla_put_failure:
-	return -1;
-}
-
 static struct nft_expr_type nft_reject_bridge_type;
 static const struct nft_expr_ops nft_reject_bridge_ops = {
 	.type		= &nft_reject_bridge_type,
 	.size		= NFT_EXPR_SIZE(sizeof(struct nft_reject)),
 	.eval		= nft_reject_bridge_eval,
-	.init		= nft_reject_bridge_init,
-	.dump		= nft_reject_bridge_dump,
+	.init		= nft_reject_init,
+	.dump		= nft_reject_dump,
 	.validate	= nft_reject_bridge_validate,
 };
 

net/netfilter/nft_reject.c

@@ -40,6 +40,7 @@ int nft_reject_init(const struct nft_ctx *ctx,
 		    const struct nlattr * const tb[])
 {
 	struct nft_reject *priv = nft_expr_priv(expr);
+	int icmp_code;
 
 	if (tb[NFTA_REJECT_TYPE] == NULL)
 		return -EINVAL;
@@ -47,9 +48,17 @@ int nft_reject_init(const struct nft_ctx *ctx,
 	priv->type = ntohl(nla_get_be32(tb[NFTA_REJECT_TYPE]));
 	switch (priv->type) {
 	case NFT_REJECT_ICMP_UNREACH:
+	case NFT_REJECT_ICMPX_UNREACH:
 		if (tb[NFTA_REJECT_ICMP_CODE] == NULL)
 			return -EINVAL;
-		priv->icmp_code = nla_get_u8(tb[NFTA_REJECT_ICMP_CODE]);
+
+		icmp_code = nla_get_u8(tb[NFTA_REJECT_ICMP_CODE]);
+		if (priv->type == NFT_REJECT_ICMPX_UNREACH &&
+		    icmp_code > NFT_REJECT_ICMPX_MAX)
+			return -EINVAL;
+
+		priv->icmp_code = icmp_code;
+		break;
 	case NFT_REJECT_TCP_RST:
 		break;
 	default:
@@ -69,6 +78,7 @@ int nft_reject_dump(struct sk_buff *skb, const struct nft_expr *expr)
 
 	switch (priv->type) {
 	case NFT_REJECT_ICMP_UNREACH:
+	case NFT_REJECT_ICMPX_UNREACH:
 		if (nla_put_u8(skb, NFTA_REJECT_ICMP_CODE, priv->icmp_code))
 			goto nla_put_failure;
 		break;

net/netfilter/nft_reject_inet.c

@@ -58,69 +58,13 @@ static void nft_reject_inet_eval(const struct nft_expr *expr,
 	regs->verdict.code = NF_DROP;
 }
 
-static int nft_reject_inet_init(const struct nft_ctx *ctx,
-				const struct nft_expr *expr,
-				const struct nlattr * const tb[])
-{
-	struct nft_reject *priv = nft_expr_priv(expr);
-	int icmp_code;
-
-	if (tb[NFTA_REJECT_TYPE] == NULL)
-		return -EINVAL;
-
-	priv->type = ntohl(nla_get_be32(tb[NFTA_REJECT_TYPE]));
-	switch (priv->type) {
-	case NFT_REJECT_ICMP_UNREACH:
-	case NFT_REJECT_ICMPX_UNREACH:
-		if (tb[NFTA_REJECT_ICMP_CODE] == NULL)
-			return -EINVAL;
-
-		icmp_code = nla_get_u8(tb[NFTA_REJECT_ICMP_CODE]);
-		if (priv->type == NFT_REJECT_ICMPX_UNREACH &&
-		    icmp_code > NFT_REJECT_ICMPX_MAX)
-			return -EINVAL;
-
-		priv->icmp_code = icmp_code;
-		break;
-	case NFT_REJECT_TCP_RST:
-		break;
-	default:
-		return -EINVAL;
-	}
-	return 0;
-}
-
-static int nft_reject_inet_dump(struct sk_buff *skb,
-				const struct nft_expr *expr)
-{
-	const struct nft_reject *priv = nft_expr_priv(expr);
-
-	if (nla_put_be32(skb, NFTA_REJECT_TYPE, htonl(priv->type)))
-		goto nla_put_failure;
-
-	switch (priv->type) {
-	case NFT_REJECT_ICMP_UNREACH:
-	case NFT_REJECT_ICMPX_UNREACH:
-		if (nla_put_u8(skb, NFTA_REJECT_ICMP_CODE, priv->icmp_code))
-			goto nla_put_failure;
-		break;
-	default:
-		break;
-	}
-
-	return 0;
-
-nla_put_failure:
-	return -1;
-}
-
 static struct nft_expr_type nft_reject_inet_type;
 static const struct nft_expr_ops nft_reject_inet_ops = {
 	.type		= &nft_reject_inet_type,
 	.size		= NFT_EXPR_SIZE(sizeof(struct nft_reject)),
 	.eval		= nft_reject_inet_eval,
-	.init		= nft_reject_inet_init,
-	.dump		= nft_reject_inet_dump,
+	.init		= nft_reject_init,
+	.dump		= nft_reject_dump,
 	.validate	= nft_reject_validate,
 };