netfilter: nft_masq: deduplicate eval call-backs

nft_masq has separate ipv4 and ipv6 call-backs which share much of their
code, and an inet one switch containing a switch that calls one of the
others based on the family of the packet. Merge the ipv4 and ipv6 ones
into the inet one in order to get rid of the duplicate code.

Const-qualify the `priv` pointer since we don't need to write through it.

Signed-off-by: Jeremy Sowden <[e-mail]>
Signed-off-by: Florian Westphal <[e-mail]>

net/netfilter/nft_masq.c

···
 	return -1;
 }
 
-static void nft_masq_ipv4_eval(const struct nft_expr *expr,
-			       struct nft_regs *regs,
-			       const struct nft_pktinfo *pkt)
+static void nft_masq_eval(const struct nft_expr *expr,
+			  struct nft_regs *regs,
+			  const struct nft_pktinfo *pkt)
 {
-	struct nft_masq *priv = nft_expr_priv(expr);
+	const struct nft_masq *priv = nft_expr_priv(expr);
 	struct nf_nat_range2 range;
 
 	memset(&range, 0, sizeof(range));
 	range.flags = priv->flags;
 	if (priv->sreg_proto_min) {
-		range.min_proto.all = (__force __be16)nft_reg_load16(
-			&regs->data[priv->sreg_proto_min]);
-		range.max_proto.all = (__force __be16)nft_reg_load16(
-			&regs->data[priv->sreg_proto_max]);
+		range.min_proto.all = (__force __be16)
+			nft_reg_load16(&regs->data[priv->sreg_proto_min]);
+		range.max_proto.all = (__force __be16)
+			nft_reg_load16(&regs->data[priv->sreg_proto_max]);
 	}
-	regs->verdict.code = nf_nat_masquerade_ipv4(pkt->skb, nft_hook(pkt),
-						    &range, nft_out(pkt));
+
+	switch (nft_pf(pkt)) {
+	case NFPROTO_IPV4:
+		regs->verdict.code = nf_nat_masquerade_ipv4(pkt->skb,
+							    nft_hook(pkt),
+							    &range,
+							    nft_out(pkt));
+		break;
+#ifdef CONFIG_NF_TABLES_IPV6
+	case NFPROTO_IPV6:
+		regs->verdict.code = nf_nat_masquerade_ipv6(pkt->skb, &range,
+							    nft_out(pkt));
+		break;
+#endif
+	default:
+		WARN_ON_ONCE(1);
+		break;
+	}
 }
 
 static void
···
 static const struct nft_expr_ops nft_masq_ipv4_ops = {
 	.type		= &nft_masq_ipv4_type,
 	.size		= NFT_EXPR_SIZE(sizeof(struct nft_masq)),
-	.eval		= nft_masq_ipv4_eval,
+	.eval		= nft_masq_eval,
 	.init		= nft_masq_init,
 	.destroy	= nft_masq_ipv4_destroy,
 	.dump		= nft_masq_dump,
···
 };
 
 #ifdef CONFIG_NF_TABLES_IPV6
-static void nft_masq_ipv6_eval(const struct nft_expr *expr,
-			       struct nft_regs *regs,
-			       const struct nft_pktinfo *pkt)
-{
-	struct nft_masq *priv = nft_expr_priv(expr);
-	struct nf_nat_range2 range;
-
-	memset(&range, 0, sizeof(range));
-	range.flags = priv->flags;
-	if (priv->sreg_proto_min) {
-		range.min_proto.all = (__force __be16)nft_reg_load16(
-			&regs->data[priv->sreg_proto_min]);
-		range.max_proto.all = (__force __be16)nft_reg_load16(
-			&regs->data[priv->sreg_proto_max]);
-	}
-	regs->verdict.code = nf_nat_masquerade_ipv6(pkt->skb, &range,
-						    nft_out(pkt));
-}
-
 static void
 nft_masq_ipv6_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr)
 {
···
 static const struct nft_expr_ops nft_masq_ipv6_ops = {
 	.type		= &nft_masq_ipv6_type,
 	.size		= NFT_EXPR_SIZE(sizeof(struct nft_masq)),
-	.eval		= nft_masq_ipv6_eval,
+	.eval		= nft_masq_eval,
 	.init		= nft_masq_init,
 	.destroy	= nft_masq_ipv6_destroy,
 	.dump		= nft_masq_dump,
···
 #endif
 
 #ifdef CONFIG_NF_TABLES_INET
-static void nft_masq_inet_eval(const struct nft_expr *expr,
-			       struct nft_regs *regs,
-			       const struct nft_pktinfo *pkt)
-{
-	switch (nft_pf(pkt)) {
-	case NFPROTO_IPV4:
-		return nft_masq_ipv4_eval(expr, regs, pkt);
-	case NFPROTO_IPV6:
-		return nft_masq_ipv6_eval(expr, regs, pkt);
-	}
-
-	WARN_ON_ONCE(1);
-}
-
 static void
 nft_masq_inet_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr)
 {
···
 static const struct nft_expr_ops nft_masq_inet_ops = {
 	.type		= &nft_masq_inet_type,
 	.size		= NFT_EXPR_SIZE(sizeof(struct nft_masq)),
-	.eval		= nft_masq_inet_eval,
+	.eval		= nft_masq_eval,
 	.init		= nft_masq_init,
 	.destroy	= nft_masq_inet_destroy,
 	.dump		= nft_masq_dump,