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From:   Sasha Levin <Alexander.Levin@microsoft.com>
To:     "stable@vger.kernel.org" <stable@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
CC:     Martin Willi <martin@strongswan.org>,
        Pablo Neira Ayuso <pablo@netfilter.org>,
        Sasha Levin <Alexander.Levin@microsoft.com>
Subject: [PATCH AUTOSEL 4.14 01/37] netfilter: xt_cluster: add dependency on
 conntrack module
Thread-Topic: [PATCH AUTOSEL 4.14 01/37] netfilter: xt_cluster: add dependency
 on conntrack module
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Date:   Mon, 1 Oct 2018 00:38:53 +0000
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From: Martin Willi <martin@strongswan.org>

[ Upstream commit c1dc2912059901f97345d9e10c96b841215fdc0f ]

The cluster match requires conntrack for matching packets. If the
netns does not have conntrack hooks registered, the match does not
work at all.

Implicitly load the conntrack hook for the family, exactly as many
other extensions do. This ensures that the match works even if the
hooks have not been registered by other means.

Signed-off-by: Martin Willi <martin@strongswan.org>
Acked-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
 net/netfilter/xt_cluster.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/net/netfilter/xt_cluster.c b/net/netfilter/xt_cluster.c
index 57ef175dfbfa..504d5f730f4e 100644
--- a/net/netfilter/xt_cluster.c
+++ b/net/netfilter/xt_cluster.c
@@ -133,6 +133,7 @@ xt_cluster_mt(const struct sk_buff *skb, struct xt_acti=
on_param *par)
 static int xt_cluster_mt_checkentry(const struct xt_mtchk_param *par)
 {
 	struct xt_cluster_match_info *info =3D par->matchinfo;
+	int ret;
=20
 	if (info->total_nodes > XT_CLUSTER_NODES_MAX) {
 		pr_info("you have exceeded the maximum "
@@ -145,7 +146,17 @@ static int xt_cluster_mt_checkentry(const struct xt_mt=
chk_param *par)
 			"higher than the total number of nodes\n");
 		return -EDOM;
 	}
-	return 0;
+
+	ret =3D nf_ct_netns_get(par->net, par->family);
+	if (ret < 0)
+		pr_info_ratelimited("cannot load conntrack support for proto=3D%u\n",
+				    par->family);
+	return ret;
+}
+
+static void xt_cluster_mt_destroy(const struct xt_mtdtor_param *par)
+{
+	nf_ct_netns_put(par->net, par->family);
 }
=20
 static struct xt_match xt_cluster_match __read_mostly =3D {
@@ -154,6 +165,7 @@ static struct xt_match xt_cluster_match __read_mostly =
=3D {
 	.match		=3D xt_cluster_mt,
 	.checkentry	=3D xt_cluster_mt_checkentry,
 	.matchsize	=3D sizeof(struct xt_cluster_match_info),
+	.destroy	=3D xt_cluster_mt_destroy,
 	.me		=3D THIS_MODULE,
 };
=20
--=20
2.17.1