netdev - [PATCH net-next 03/14] netfilter: conntrack: move autoassign warning member to net

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Message-Id: <20210418210415.4719-4-pablo@netfilter.org>
Date:   Sun, 18 Apr 2021 23:04:04 +0200
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 03/14] netfilter: conntrack: move autoassign warning member to net_generic data

From: Florian Westphal <fw@...len.de>

Not accessed in fast path, place this is generic_net data instead.

Signed-off-by: Florian Westphal <fw@...len.de>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
 include/net/netfilter/nf_conntrack.h | 4 ++++
 net/netfilter/nf_conntrack_helper.c  | 9 ++++++---
 2 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/include/net/netfilter/nf_conntrack.h b/include/net/netfilter/nf_conntrack.h
index 86d86c860ede..c532b629db7b 100644
--- a/include/net/netfilter/nf_conntrack.h
+++ b/include/net/netfilter/nf_conntrack.h
@@ -44,6 +44,10 @@ union nf_conntrack_expect_proto {
 };
 
 struct nf_conntrack_net {
+	/* only used when new connection is allocated: */
+	bool auto_assign_helper_warned;
+
+	/* only used from work queues, configuration plane, and so on: */
 	unsigned int users4;
 	unsigned int users6;
 	unsigned int users_bridge;
diff --git a/net/netfilter/nf_conntrack_helper.c b/net/netfilter/nf_conntrack_helper.c
index b055187235f8..ad91964eaa92 100644
--- a/net/netfilter/nf_conntrack_helper.c
+++ b/net/netfilter/nf_conntrack_helper.c
@@ -43,6 +43,8 @@ MODULE_PARM_DESC(nf_conntrack_helper,
 static DEFINE_MUTEX(nf_ct_nat_helpers_mutex);
 static struct list_head nf_ct_nat_helpers __read_mostly;
 
+extern unsigned int nf_conntrack_net_id;
+
 /* Stupid hash, but collision free for the default registrations of the
  * helpers currently in the kernel. */
 static unsigned int helper_hash(const struct nf_conntrack_tuple *tuple)
@@ -212,8 +214,10 @@ EXPORT_SYMBOL_GPL(nf_ct_helper_ext_add);
 static struct nf_conntrack_helper *
 nf_ct_lookup_helper(struct nf_conn *ct, struct net *net)
 {
+	struct nf_conntrack_net *cnet = net_generic(net, nf_conntrack_net_id);
+
 	if (!net->ct.sysctl_auto_assign_helper) {
-		if (net->ct.auto_assign_helper_warned)
+		if (cnet->auto_assign_helper_warned)
 			return NULL;
 		if (!__nf_ct_helper_find(&ct->tuplehash[IP_CT_DIR_REPLY].tuple))
 			return NULL;
@@ -221,7 +225,7 @@ nf_ct_lookup_helper(struct nf_conn *ct, struct net *net)
 			"has been turned off for security reasons and CT-based "
 			"firewall rule not found. Use the iptables CT target "
 			"to attach helpers instead.\n");
-		net->ct.auto_assign_helper_warned = 1;
+		cnet->auto_assign_helper_warned = true;
 		return NULL;
 	}
 
@@ -556,7 +560,6 @@ static const struct nf_ct_ext_type helper_extend = {
 
 void nf_conntrack_helper_pernet_init(struct net *net)
 {
-	net->ct.auto_assign_helper_warned = false;
 	net->ct.sysctl_auto_assign_helper = nf_ct_auto_assign_helper;
 }
 
-- 
2.30.2