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Subject[PATCH] net: batch nf_conntrack_net_exit
Date
The patch introduces nf_conntrack_cleanup_list(), which cleanups
nf_conntracks for a list of netns and calls synchronize_net() only
once for them all.
---
include/net/netfilter/nf_conntrack_core.h | 10 +++++++++-
net/netfilter/nf_conntrack_core.c | 21 +++++++++++++--------
net/netfilter/nf_conntrack_standalone.c | 14 +++++++++-----
3 files changed, 31 insertions(+), 14 deletions(-)
diff --git a/include/net/netfilter/nf_conntrack_core.h b/include/net/netfilter/nf_conntrack_core.h
index d8f5b9f..f53b855 100644
--- a/include/net/netfilter/nf_conntrack_core.h
+++ b/include/net/netfilter/nf_conntrack_core.h
@@ -26,7 +26,15 @@ extern unsigned int nf_conntrack_in(struct net *net,
struct sk_buff *skb);

extern int nf_conntrack_init(struct net *net);
-extern void nf_conntrack_cleanup(struct net *net);
+extern void nf_conntrack_cleanup_list(struct list_head *net_exit_list);
+
+static inline void nf_conntrack_cleanup(struct net *net)
+{
+ LIST_HEAD(single);
+
+ list_add(&net->exit_list, &single);
+ nf_conntrack_cleanup_list(&single);
+}

extern int nf_conntrack_proto_init(struct net *net);
extern void nf_conntrack_proto_fini(struct net *net);
diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index cf48755..afa62f7 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -1363,21 +1363,26 @@ static void nf_conntrack_cleanup_net(struct net *net)

/* Mishearing the voices in his head, our hero wonders how he's
supposed to kill the mall. */
-void nf_conntrack_cleanup(struct net *net)
+void nf_conntrack_cleanup_list(struct list_head *net_exit_list)
{
- if (net_eq(net, &init_net))
- RCU_INIT_POINTER(ip_ct_attach, NULL);
+ struct net *net;
+
+ list_for_each_entry(net, net_exit_list, exit_list)
+ if (net_eq(net, &init_net))
+ RCU_INIT_POINTER(ip_ct_attach, NULL);

/* This makes sure all current packets have passed through
netfilter framework. Roll on, two-stage module
delete... */
synchronize_net();
- nf_conntrack_proto_fini(net);
- nf_conntrack_cleanup_net(net);

- if (net_eq(net, &init_net)) {
- RCU_INIT_POINTER(nf_ct_destroy, NULL);
- nf_conntrack_cleanup_init_net();
+ list_for_each_entry(net, net_exit_list, exit_list) {
+ nf_conntrack_proto_fini(net);
+ nf_conntrack_cleanup_net(net);
+ if (net_eq(net, &init_net)) {
+ RCU_INIT_POINTER(nf_ct_destroy, NULL);
+ nf_conntrack_cleanup_init_net();
+ }
}
}

diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_conntrack_standalone.c
index 9b39432..8f60708 100644
--- a/net/netfilter/nf_conntrack_standalone.c
+++ b/net/netfilter/nf_conntrack_standalone.c
@@ -551,16 +551,20 @@ out_init:
return ret;
}

-static void nf_conntrack_net_exit(struct net *net)
+static void nf_conntrack_net_exit(struct list_head *net_exit_list)
{
- nf_conntrack_standalone_fini_sysctl(net);
- nf_conntrack_standalone_fini_proc(net);
- nf_conntrack_cleanup(net);
+ struct net *net;
+
+ list_for_each_entry(net, net_exit_list, exit_list) {
+ nf_conntrack_standalone_fini_sysctl(net);
+ nf_conntrack_standalone_fini_proc(net);
+ }
+ nf_conntrack_cleanup_list(net_exit_list);
}

static struct pernet_operations nf_conntrack_net_ops = {
.init = nf_conntrack_net_init,
- .exit = nf_conntrack_net_exit,
+ .exit_batch = nf_conntrack_net_exit,
};

static int __init nf_conntrack_standalone_init(void)
--
1.7.1


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