netdev - [PATCH net-next 1/2] netfilter: Export nf_ct_destroy

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Date:   Wed, 20 Mar 2019 14:11:34 -0700
From:   Yi-Hung Wei <yihung.wei@...il.com>
To:     netdev@...r.kernel.org
Cc:     Yi-Hung Wei <yihung.wei@...il.com>,
        Pablo Neira Ayuso <pablo@...filter.org>
Subject: [PATCH net-next 1/2] netfilter: Export nf_ct_destroy_timeout()

This patch moves xt_ct_destroy_timeout from xt_CT.c to
nf_conntrack_timeout.c, renames it to nf_ct_destroy_timeout(), and
exports it.  It does not contain any functional change.
It would be useful for other users (i.e. OVS) that utilizes the
finer-grain conntrack timeout feature.

CC: Pablo Neira Ayuso <pablo@...filter.org>
Signed-off-by: Yi-Hung Wei <yihung.wei@...il.com>
---
 include/net/netfilter/nf_conntrack_timeout.h |  1 +
 net/netfilter/nf_conntrack_timeout.c         | 21 +++++++++++++++++++++
 net/netfilter/xt_CT.c                        | 22 +---------------------
 3 files changed, 23 insertions(+), 21 deletions(-)

diff --git a/include/net/netfilter/nf_conntrack_timeout.h b/include/net/netfilter/nf_conntrack_timeout.h
index 3394d75e1c80..5ce62fa1e1e2 100644
--- a/include/net/netfilter/nf_conntrack_timeout.h
+++ b/include/net/netfilter/nf_conntrack_timeout.h
@@ -105,4 +105,5 @@ extern struct nf_ct_timeout *(*nf_ct_timeout_find_get_hook)(struct net *net, con
 extern void (*nf_ct_timeout_put_hook)(struct nf_ct_timeout *timeout);
 #endif
 
+void nf_ct_destroy_timeout(struct nf_conn *ct);
 #endif /* _NF_CONNTRACK_TIMEOUT_H */
diff --git a/net/netfilter/nf_conntrack_timeout.c b/net/netfilter/nf_conntrack_timeout.c
index 91fbd183da2d..11b7f58e7f88 100644
--- a/net/netfilter/nf_conntrack_timeout.c
+++ b/net/netfilter/nf_conntrack_timeout.c
@@ -48,6 +48,27 @@ void nf_ct_untimeout(struct net *net, struct nf_ct_timeout *timeout)
 }
 EXPORT_SYMBOL_GPL(nf_ct_untimeout);
 
+void nf_ct_destroy_timeout(struct nf_conn *ct)
+{
+#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
+	struct nf_conn_timeout *timeout_ext;
+	typeof(nf_ct_timeout_put_hook) timeout_put;
+
+	rcu_read_lock();
+	timeout_put = rcu_dereference(nf_ct_timeout_put_hook);
+
+	if (timeout_put) {
+		timeout_ext = nf_ct_timeout_find(ct);
+		if (timeout_ext) {
+			timeout_put(timeout_ext->timeout);
+			RCU_INIT_POINTER(timeout_ext->timeout, NULL);
+		}
+	}
+	rcu_read_unlock();
+#endif
+}
+EXPORT_SYMBOL_GPL(nf_ct_destroy_timeout);
+
 static const struct nf_ct_ext_type timeout_extend = {
 	.len	= sizeof(struct nf_conn_timeout),
 	.align	= __alignof__(struct nf_conn_timeout),
diff --git a/net/netfilter/xt_CT.c b/net/netfilter/xt_CT.c
index 0fa863f57575..14600ad731ce 100644
--- a/net/netfilter/xt_CT.c
+++ b/net/netfilter/xt_CT.c
@@ -328,26 +328,6 @@ static int xt_ct_tg_check_v2(const struct xt_tgchk_param *par)
 	return xt_ct_tg_check(par, par->targinfo);
 }
 
-static void xt_ct_destroy_timeout(struct nf_conn *ct)
-{
-#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
-	struct nf_conn_timeout *timeout_ext;
-	typeof(nf_ct_timeout_put_hook) timeout_put;
-
-	rcu_read_lock();
-	timeout_put = rcu_dereference(nf_ct_timeout_put_hook);
-
-	if (timeout_put) {
-		timeout_ext = nf_ct_timeout_find(ct);
-		if (timeout_ext) {
-			timeout_put(timeout_ext->timeout);
-			RCU_INIT_POINTER(timeout_ext->timeout, NULL);
-		}
-	}
-	rcu_read_unlock();
-#endif
-}
-
 static void xt_ct_tg_destroy(const struct xt_tgdtor_param *par,
 			     struct xt_ct_target_info_v1 *info)
 {
@@ -361,7 +341,7 @@ static void xt_ct_tg_destroy(const struct xt_tgdtor_param *par,
 
 		nf_ct_netns_put(par->net, par->family);
 
-		xt_ct_destroy_timeout(ct);
+		nf_ct_destroy_timeout(ct);
 		nf_ct_put(info->ct);
 	}
 }
-- 
2.7.4