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Subject[PATCH 2/4] netns: Export nets id to /proc/net/netns
This patches exports the new 'struct net' net->id value to /proc/net/nsid
file.

Signed-off-by: Benjamin Thery <benjamin.thery@bull.net>
---
net/core/net_namespace.c | 50 +++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 50 insertions(+)
Index: net-next-2.6/net/core/net_namespace.c
===================================================================
--- net-next-2.6.orig/net/core/net_namespace.c
+++ net-next-2.6/net/core/net_namespace.c
@@ -6,6 +6,7 @@
#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/idr.h>
+#include <linux/proc_fs.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>

@@ -211,6 +212,53 @@ struct net *copy_net_ns(unsigned long fl
}
#endif

+#ifdef CONFIG_PROC_FS
+static int netns_seq_show(struct seq_file *seq, void *v)
+{
+ struct net *net = seq->private;
+
+ seq_printf(seq, "%x\n", net->id);
+ return 0;
+}
+
+static int netns_seq_open(struct inode *inode, struct file *file)
+{
+ return single_open_net(inode, file, netns_seq_show);
+}
+
+static const struct file_operations netns_seq_fops = {
+ .owner = THIS_MODULE,
+ .open = netns_seq_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release_net,
+};
+
+static int __net_init netns_net_init(struct net *net)
+{
+ if (!proc_net_fops_create(net, "nsid", S_IRUGO, &netns_seq_fops))
+ return -ENOMEM;
+ return 0;
+}
+
+static void __net_exit netns_net_exit(struct net *net)
+{
+ proc_net_remove(net, "nsid");
+}
+
+static struct pernet_operations netns_proc_ops = {
+ .init = netns_net_init,
+ .exit = netns_net_exit,
+};
+
+static int __init netns_proc_init()
+{
+ return register_pernet_subsys(&netns_proc_ops);
+}
+#else
+#define netns_proc_init() 0
+#endif /* CONFIG_PROC_FS */
+
static int __init net_ns_init(void)
{
int err;
@@ -226,6 +274,8 @@ static int __init net_ns_init(void)
if (!netns_wq)
panic("Could not create netns workq");
#endif
+ if (netns_proc_init())
+ panic("Could not register netns subsys");

mutex_lock(&net_mutex);
err = setup_net(&init_net);
--


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