| [PATCH 3/9] network namespaces: playing and debugging [message #5164] |
Tue, 15 August 2006 14:48  |
Andrey Savochkin
Messages: 47
Registered: December 2005
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Member |
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Temporary code to play with network namespaces in the simplest way.
Do
exec 7< /proc/net/net_ns
in your bash shell and you'll get a brand new network namespace.
There you can, for example, do
ip link set lo up
ip addr list
ip addr add 1.2.3.4 dev lo
ping -n 1.2.3.4
Signed-off-by: Andrey Savochkin <saw@swsoft.com>
---
dev.c | 20 ++++++++++++++++++++
1 files changed, 20 insertions(+)
--- ./net/core/dev.c.vensxdbg Tue Aug 15 13:46:44 2006
+++ ./net/core/dev.c Tue Aug 15 13:46:44 2006
@@ -3597,6 +3597,8 @@ int net_ns_start(void)
if (err)
goto out_register;
put_net_ns(orig_ns);
+ printk(KERN_DEBUG "NET_NS: created new netcontext %p for %s (pid=%d)\n",
+ ns, task->comm, task->tgid);
return 0;
out_register:
@@ -3629,14 +3631,29 @@ static void net_ns_destroy(void *data)
ip_fib_struct_cleanup();
pop_net_ns(orig_ns);
kfree(ns);
+ printk(KERN_DEBUG "NET_NS: netcontext %p freed\n", ns);
}
void net_ns_stop(struct net_namespace *ns)
{
+ printk(KERN_DEBUG "NET_NS: netcontext %p scheduled for stop\n", ns);
INIT_WORK(&ns->destroy_work, net_ns_destroy, ns);
schedule_work(&ns->destroy_work);
}
EXPORT_SYMBOL(net_ns_stop);
+
+static int net_ns_open(struct inode *i, struct file *f)
+{
+ return net_ns_start();
+}
+static struct file_operations net_ns_fops = {
+ .open = net_ns_open,
+};
+static int net_ns_init(void)
+{
+ return proc_net_fops_create("net_ns", S_IRWXU, &net_ns_fops)
+ ? 0 : -ENOMEM;
+}
#endif
/*
@@ -3701,6 +3718,9 @@ static int __init net_dev_init(void)
hotcpu_notifier(dev_cpu_callback, 0);
dst_init();
dev_mcast_init();
+#ifdef CONFIG_NET_NS
+ net_ns_init();
+#endif
rc = 0;
out:
return rc;
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