[PATCH 20/33] netns ct: per-netns net.netfilter.nf_conntrack_count sysctl

Alexey Dobriyan
2008-09-08T03:02:42Z

Note, sysctl table is always duplicated, this is simpler, less special-cased
less mistakes (and I did one in first version of this patch)

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>

diff --git a/include/net/netns/conntrack.h b/include/net/netns/conntrack.h
index fc0a46d..2b50758 100644
--- a/include/net/netns/conntrack.h
+++ b/include/net/netns/conntrack.h
@@ -4,6 +4,7 @@
#include <linux/list.h>
#include <asm/atomic.h>

+struct ctl_table_header;
struct nf_conntrack_ecache;

struct netns_ct {
@@ -16,6 +17,9 @@ struct netns_ct {
#ifdef CONFIG_NF_CONNTRACK_EVENTS
struct nf_conntrack_ecache *ecache;
#endif
+#ifdef CONFIG_SYSCTL
+ struct ctl_table_header *sysctl_header;
+#endif
int hash_vmalloc;
int expect_vmalloc;
};
diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_conntrack_standalone.c
index 169760d..64b4f95 100644
--- a/net/netfilter/nf_conntrack_standalone.c
+++ b/net/netfilter/nf_conntrack_standalone.c
@@ -330,7 +330,6 @@ EXPORT_SYMBOL_GPL(nf_conntrack_checksum);
static int log_invalid_proto_min = 0;
static int log_invalid_proto_max = 255;

-static struct ctl_table_header *nf_ct_sysctl_header;
static struct ctl_table_header *nf_ct_netfilter_header;

static ctl_table nf_ct_sysctl_table[] = {
@@ -409,40 +408,58 @@ static struct ctl_path nf_ct_path[] = {

EXPORT_SYMBOL_GPL(nf_ct_log_invalid);

-static int nf_conntrack_standalone_init_sysctl(void)
+static int nf_conntrack_standalone_init_sysctl(struct net *net)
{
- nf_ct_netfilter_header =
- register_sysctl_paths(nf_ct_path, nf_ct_netfilter_table);
- if (!nf_ct_netfilter_header)
- goto out;
-
- nf_ct_sysctl_header =
- register_sysctl_paths(nf_net_netfilter_sysctl_path,
- nf_ct_sysctl_table);
- if (!nf_ct_sysctl_header)
+ struct ctl_table *table;
+
+ if (net_eq(net, &init_net)) {
+ nf_ct_netfilter_header =
+ register_sysctl_paths(nf_ct_path, nf_ct_netfilter_table);
+ if (!nf_ct_netfilter_header)
+ goto out;
+ }
+
+ table = kmemdup(nf_ct_sysctl_table, sizeof(nf_ct_sysctl_table),
+ GFP_KERNEL);
+ if (!table)
+ goto out_kmemdup;
+
+ table[1].data = &net->ct.count;
+
+ net->ct.sysctl_header = register_net_sysctl_table(net,
+ nf_net_netfilter_sysctl_path, table);
+ if (!net->ct.sysctl_header)
goto out_unregister_netfilter;

return 0;

out_unregister_netfilter:
- unregister_sysctl_table(nf_ct_netfilter_header);
+ kfree(table);
+out_kmemdup:
+ if (net_eq(net, &init_net))
+ unregister_sysctl_table(nf_ct_netfilter_header);
out:
printk("nf_conntrack: can't register to sysctl.\n");
return -ENOMEM;
}

-static void nf_conntrack_standalone_fini_sysctl(void)
+static void nf_conntrack_standalone_fini_sysctl(struct net *net)
{
- unregister_sysctl_table(nf_ct_netfilter_header);
- unregister_sysctl_table(nf_ct_sysctl_header);
+ struct ctl_table *table;
+
+ if (net_eq(net, &init_net))
+ unregister_sysctl_table(nf_ct_netfilter_header);
+ table = net->ct.sysctl_header->ctl_table_arg;
+ unregister_net_sysctl_table(net->ct.sysctl_header);
+ kfree(table);
}
#else
-static int nf_conntrack_standalone_init_sysctl(void)
+static int nf_conntrack_standalone_init_sysctl(struct net *net)
{
return 0;
}

-static void nf_conntrack_standalone_fini_sysctl(void)
+static void nf_conntrack_standalone_fini_sysctl(struct net *net)
{
}
#endif /* CONFIG_SYSCTL */
@@ -457,8 +474,13 @@ static int nf_conntrack_net_init(struct net *net)
ret = nf_conntrack_standalone_init_proc(net);
if (ret < 0)
goto out_proc;
+ ret = nf_conntrack_standalone_init_sysctl(net);
+ if (ret < 0)
+ goto out_sysctl;
return 0;

+out_sysctl:
+ nf_conntrack_standalone_fini_proc(net);
out_proc:
nf_conntrack_cleanup(net);
out_init:
@@ -467,6 +489,7 @@ out_init:

static void nf_conntrack_net_exit(struct net *net)
{
+ nf_conntrack_standalone_fini_sysctl(net);
nf_conntrack_standalone_fini_proc(net);
nf_conntrack_cleanup(net);
}
@@ -478,25 +501,11 @@ static struct pernet_operations nf_conntrack_net_ops = {

static int __init nf_conntrack_standalone_init(void)
{
- int ret;
-
- ret = register_pernet_subsys(&nf_conntrack_net_ops);
- if (ret < 0)
- goto out;
- ret = nf_conntrack_standalone_init_sysctl();
- if (ret < 0)
- goto out_sysctl;
- return 0;
-
-out_sysctl:
- unregister_pernet_subsys(&nf_conntrack_net_ops);
-out:
- return ret;
+ return register_pernet_subsys(&nf_conntrack_net_ops);
}

static void __exit nf_conntrack_standalone_fini(void)
{
- nf_conntrack_standalone_fini_sysctl();
unregister_pernet_subsys(&nf_conntrack_net_ops);
}