pid->real_pid to fetch netns across vserver contexts

[linux-2.6.git] / linux-2.6-594-new_ns_pid.patch

diff --git a/linux-2.6-594-new_ns_pid.patch b/linux-2.6-594-new_ns_pid.patch
new file mode 100644 (file)
index 0000000..f986980
--- /dev/null
+++ b/linux-2.6-594-new_ns_pid.patch
@@ -0,0 +1,52 @@
+diff -Nurb linux-2.6.22-592/net/core/net-sysfs.c linux-2.6.22-594/net/core/net-sysfs.c
+--- linux-2.6.22-592/net/core/net-sysfs.c      2008-02-29 08:45:15.000000000 -0500
++++ linux-2.6.22-594/net/core/net-sysfs.c      2008-02-29 08:55:47.000000000 -0500
+@@ -190,6 +190,40 @@
+       return netdev_store(device, attr, buf, len, change_mtu);
+ }
+ 
++static ssize_t show_new_ns_pid(struct class_device *cd, char *buf)
++{
++      return -EPERM;
++}
++static int change_new_ns_pid(struct net_device *dev, unsigned long new_ns_pid)
++{
++      struct task_struct *tsk;
++      int err;
++      struct net *net;
++      /* Look up the network namespace */
++      err = -ESRCH;
++      rcu_read_lock();
++      tsk = find_task_by_real_pid(new_ns_pid);
++      if (tsk) {
++              task_lock(tsk);
++              if (tsk->nsproxy) {
++                      err = 0;
++                      net = get_net(tsk->nsproxy->net_ns);
++              }
++              task_unlock(tsk);
++      }
++      rcu_read_unlock();
++      /* If I found a network namespace move the device */
++      if (!err) {
++              err = dev_change_net_namespace(dev, net, NULL);
++              put_net(net);
++      }
++      return err;
++}
++static ssize_t store_new_ns_pid(struct class_device *cd, const char *buf, size_t len)
++{
++      return netdev_store(cd, buf, len, change_new_ns_pid);
++}
++
+ NETDEVICE_SHOW(flags, fmt_hex);
+ 
+ static int change_flags(struct net_device *dev, unsigned long new_flags)
+@@ -249,6 +283,7 @@
+       __ATTR(tx_queue_len, S_IRUGO | S_IWUSR, show_tx_queue_len,
+              store_tx_queue_len),
+       __ATTR(weight, S_IRUGO | S_IWUSR, show_weight, store_weight),
++      __ATTR(new_ns_pid, S_IWUSR, show_new_ns_pid, store_new_ns_pid),
+       {}
+ };
+