netdev - [PATCH net-next 02/19] netfilter: conntrack: Add and use nf_ct_set_auto_assign_helper

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Date:   Mon, 21 Mar 2022 13:30:35 +0100
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     netfilter-devel@...r.kernel.org
Cc:     davem@...emloft.net, netdev@...r.kernel.org, kuba@...nel.org
Subject: [PATCH net-next 02/19] netfilter: conntrack: Add and use nf_ct_set_auto_assign_helper_warned()

From: Phil Sutter <phil@....cc>

The function sets the pernet boolean to avoid the spurious warning from
nf_ct_lookup_helper() when assigning conntrack helpers via nftables.

Fixes: 1a64edf54f55 ("netfilter: nft_ct: add helper set support")
Signed-off-by: Phil Sutter <phil@....cc>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
 include/net/netfilter/nf_conntrack_helper.h | 1 +
 net/netfilter/nf_conntrack_helper.c         | 6 ++++++
 net/netfilter/nft_ct.c                      | 3 +++
 3 files changed, 10 insertions(+)

diff --git a/include/net/netfilter/nf_conntrack_helper.h b/include/net/netfilter/nf_conntrack_helper.h
index 37f0fbefb060..9939c366f720 100644
--- a/include/net/netfilter/nf_conntrack_helper.h
+++ b/include/net/netfilter/nf_conntrack_helper.h
@@ -177,4 +177,5 @@ void nf_nat_helper_unregister(struct nf_conntrack_nat_helper *nat);
 int nf_nat_helper_try_module_get(const char *name, u16 l3num,
 				 u8 protonum);
 void nf_nat_helper_put(struct nf_conntrack_helper *helper);
+void nf_ct_set_auto_assign_helper_warned(struct net *net);
 #endif /*_NF_CONNTRACK_HELPER_H*/
diff --git a/net/netfilter/nf_conntrack_helper.c b/net/netfilter/nf_conntrack_helper.c
index a97ddb1497aa..8dec42ec603e 100644
--- a/net/netfilter/nf_conntrack_helper.c
+++ b/net/netfilter/nf_conntrack_helper.c
@@ -550,6 +550,12 @@ void nf_nat_helper_unregister(struct nf_conntrack_nat_helper *nat)
 }
 EXPORT_SYMBOL_GPL(nf_nat_helper_unregister);
 
+void nf_ct_set_auto_assign_helper_warned(struct net *net)
+{
+	nf_ct_pernet(net)->auto_assign_helper_warned = true;
+}
+EXPORT_SYMBOL_GPL(nf_ct_set_auto_assign_helper_warned);
+
 void nf_conntrack_helper_pernet_init(struct net *net)
 {
 	struct nf_conntrack_net *cnet = nf_ct_pernet(net);
diff --git a/net/netfilter/nft_ct.c b/net/netfilter/nft_ct.c
index 5adf8bb628a8..9c7472af9e4a 100644
--- a/net/netfilter/nft_ct.c
+++ b/net/netfilter/nft_ct.c
@@ -1041,6 +1041,9 @@ static int nft_ct_helper_obj_init(const struct nft_ctx *ctx,
 	if (err < 0)
 		goto err_put_helper;
 
+	/* Avoid the bogus warning, helper will be assigned after CT init */
+	nf_ct_set_auto_assign_helper_warned(ctx->net);
+
 	return 0;
 
 err_put_helper:
-- 
2.30.2