LXR linux/net/openvswitch/vport-gre.c

   1/*
   2 * Copyright (c) 2007-2014 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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  20
  21#include <linux/if.h>
  22#include <linux/skbuff.h>
  23#include <linux/ip.h>
  24#include <linux/if_tunnel.h>
  25#include <linux/if_vlan.h>
  26#include <linux/in.h>
  27#include <linux/in_route.h>
  28#include <linux/inetdevice.h>
  29#include <linux/jhash.h>
  30#include <linux/list.h>
  31#include <linux/kernel.h>
  32#include <linux/module.h>
  33#include <linux/workqueue.h>
  34#include <linux/rculist.h>
  35#include <net/route.h>
  36#include <net/xfrm.h>
  37
  38#include <net/icmp.h>
  39#include <net/ip.h>
  40#include <net/ip_tunnels.h>
  41#include <net/gre.h>
  42#include <net/net_namespace.h>
  43#include <net/netns/generic.h>
  44#include <net/protocol.h>
  45
  46#include "datapath.h"
  47#include "vport.h"
  48#include "vport-netdev.h"
  49
  50static struct vport_ops ovs_gre_vport_ops;
  51
  52static struct vport *gre_tnl_create(const struct vport_parms *parms)
  53{
  54        struct net *net = ovs_dp_get_net(parms->dp);
  55        struct net_device *dev;
  56        struct vport *vport;
  57
  58        vport = ovs_vport_alloc(0, &ovs_gre_vport_ops, parms);
  59        if (IS_ERR(vport))
  60                return vport;
  61
  62        rtnl_lock();
  63        dev = gretap_fb_dev_create(net, parms->name, NET_NAME_USER);
  64        if (IS_ERR(dev)) {
  65                rtnl_unlock();
  66                ovs_vport_free(vport);
  67                return ERR_CAST(dev);
  68        }
  69
  70        dev_change_flags(dev, dev->flags | IFF_UP);
  71        rtnl_unlock();
  72
  73        return vport;
  74}
  75
  76static struct vport *gre_create(const struct vport_parms *parms)
  77{
  78        struct vport *vport;
  79
  80        vport = gre_tnl_create(parms);
  81        if (IS_ERR(vport))
  82                return vport;
  83
  84        return ovs_netdev_link(vport, parms->name);
  85}
  86
  87static struct vport_ops ovs_gre_vport_ops = {
  88        .type           = OVS_VPORT_TYPE_GRE,
  89        .create         = gre_create,
  90        .send           = dev_queue_xmit,
  91        .destroy        = ovs_netdev_tunnel_destroy,
  92};
  93
  94static int __init ovs_gre_tnl_init(void)
  95{
  96        return ovs_vport_ops_register(&ovs_gre_vport_ops);
  97}
  98
  99static void __exit ovs_gre_tnl_exit(void)
 100{
 101        ovs_vport_ops_unregister(&ovs_gre_vport_ops);
 102}
 103
 104module_init(ovs_gre_tnl_init);
 105module_exit(ovs_gre_tnl_exit);
 106
 107MODULE_DESCRIPTION("OVS: GRE switching port");
 108MODULE_LICENSE("GPL");
 109MODULE_ALIAS("vport-type-3");
 110