net/openvswitch/dp_notify.c

   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,
  47                                                           OVS_VPORT_CMD_DEL);
  48                         ovs_dp_detach_port(vport);
  49                         if (IS_ERR(notify)) {
  50                                 netlink_set_err(ovs_dp_get_net(dp)->genl_sock, 0,
  51                                                 ovs_dp_vport_multicast_group.id,
  52                                                 PTR_ERR(notify));
  53                                 break;
  54                         }
  55
  56                         genlmsg_multicast_netns(ovs_dp_get_net(dp), notify, 0,
  57                                                 ovs_dp_vport_multicast_group.id,
  58                                                 GFP_KERNEL);
  59                 }
  60                 break;
  61         }
  62
  63         return NOTIFY_DONE;
  64 }
  65
  66 struct notifier_block ovs_dp_device_notifier = {
  67         .notifier_call = dp_device_event
  68 };