From 1fe92af5a03608b94e8e1e2ff26e24adfe2ea09a Mon Sep 17 00:00:00 2001
From: Phil Sutter <psutter@redhat.com>
Date: Fri, 21 Jan 2022 12:35:39 +0100
Subject: [PATCH] evaluate: fix inet nat with no layer 3 info

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2030773
Upstream Status: nftables commit 9a36033ce5063

commit 9a36033ce50638a403d1421935cdd1287ee5de6b
Author: Pablo Neira Ayuso <pablo@netfilter.org>
Date:   Tue Jul 20 18:59:44 2021 +0200

    evaluate: fix inet nat with no layer 3 info

    nft currently reports:

     Error: Could not process rule: Protocol error
     add rule inet x y meta l4proto tcp dnat to :80
                                        ^^^^

    default to NFPROTO_INET family, otherwise kernel bails out EPROTO when
    trying to load the conntrack helper.

    Closes: https://bugzilla.netfilter.org/show_bug.cgi?id=1428
    Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 src/evaluate.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/evaluate.c b/src/evaluate.c
index 9381f23..e495faf 100644
--- a/src/evaluate.c
+++ b/src/evaluate.c
@@ -2757,9 +2757,10 @@ static int nat_evaluate_family(struct eval_ctx *ctx, struct stmt *stmt)
 			stmt->nat.family = ctx->pctx.family;
 		return 0;
 	case NFPROTO_INET:
-		if (!stmt->nat.addr)
+		if (!stmt->nat.addr) {
+			stmt->nat.family = NFPROTO_INET;
 			return 0;
-
+		}
 		if (stmt->nat.family != NFPROTO_UNSPEC)
 			return 0;
 
-- 
2.31.1