Linux Kernel  3.7.1
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dp_notify.c
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1 /*
2  * Copyright (c) 2007-2012 Nicira, Inc.
3  *
4  * This program is free software; you can redistribute it and/or
5  * modify it under the terms of version 2 of the GNU General Public
6  * License as published by the Free Software Foundation.
7  *
8  * This program is distributed in the hope that it will be useful, but
9  * WITHOUT ANY WARRANTY; without even the implied warranty of
10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11  * General Public License for more details.
12  *
13  * You should have received a copy of the GNU General Public License
14  * along with this program; if not, write to the Free Software
15  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
16  * 02110-1301, USA
17  */
18 
19 #include <linux/netdevice.h>
20 #include <net/genetlink.h>
21 
22 #include "datapath.h"
23 #include "vport-internal_dev.h"
24 #include "vport-netdev.h"
25 
26 static int dp_device_event(struct notifier_block *unused, unsigned long event,
27  void *ptr)
28 {
29  struct net_device *dev = ptr;
30  struct vport *vport;
31 
32  if (ovs_is_internal_dev(dev))
33  vport = ovs_internal_dev_get_vport(dev);
34  else
35  vport = ovs_netdev_get_vport(dev);
36 
37  if (!vport)
38  return NOTIFY_DONE;
39 
40  switch (event) {
41  case NETDEV_UNREGISTER:
42  if (!ovs_is_internal_dev(dev)) {
43  struct sk_buff *notify;
44  struct datapath *dp = vport->dp;
45 
46  notify = ovs_vport_cmd_build_info(vport, 0, 0,
48  ovs_dp_detach_port(vport);
49  if (IS_ERR(notify)) {
50  netlink_set_err(ovs_dp_get_net(dp)->genl_sock, 0,
52  PTR_ERR(notify));
53  break;
54  }
55 
56  genlmsg_multicast_netns(ovs_dp_get_net(dp), notify, 0,
58  GFP_KERNEL);
59  }
60  break;
61  }
62 
63  return NOTIFY_DONE;
64 }
65 
67  .notifier_call = dp_device_event
68 };