From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: Tue, 20 Jul 2021 16:22:50 +0000 (+0200)
Subject: netfilter: nft_nat: allow to specify layer 4 protocol NAT only
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=2e3301b484bc593f59da2be15454625f41caa518;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

netfilter: nft_nat: allow to specify layer 4 protocol NAT only

[ Upstream commit a33f387ecd5aafae514095c2c4a8c24f7aea7e8b ]

nft_nat reports a bogus EAFNOSUPPORT if no layer 3 information is specified.

Fixes: d07db9884a5f ("netfilter: nf_tables: introduce nft_validate_register_load()")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/net/netfilter/nft_nat.c b/net/netfilter/nft_nat.c
index d2510e432c18..d338d69a0e0b 100644
--- a/net/netfilter/nft_nat.c
+++ b/net/netfilter/nft_nat.c
@@ -157,7 +157,9 @@ static int nft_nat_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
 		alen = FIELD_SIZEOF(struct nf_nat_range, min_addr.ip6);
 		break;
 	default:
-		return -EAFNOSUPPORT;
+		if (tb[NFTA_NAT_REG_ADDR_MIN])
+			return -EAFNOSUPPORT;
+		break;
 	}
 	priv->family = family;