linux/net/openvswitch/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
  26static 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
  66struct notifier_block ovs_dp_device_notifier = {
  67        .notifier_call = dp_device_event
  68};
  69
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