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	int err;
 58
 59	vport = ovs_vport_alloc(0, &ovs_gre_vport_ops, parms);
 60	if (IS_ERR(vport))
 61		return vport;
 62
 63	rtnl_lock();
 64	dev = gretap_fb_dev_create(net, parms->name, NET_NAME_USER);
 65	if (IS_ERR(dev)) {
 66		rtnl_unlock();
 67		ovs_vport_free(vport);
 68		return ERR_CAST(dev);
 69	}
 70
 71	err = dev_change_flags(dev, dev->flags | IFF_UP);
 72	if (err < 0) {
 73		rtnl_delete_link(dev);
 74		rtnl_unlock();
 75		ovs_vport_free(vport);
 76		return ERR_PTR(err);
 77	}
 78
 79	rtnl_unlock();
 80	return vport;
 81}
 82
 83static struct vport *gre_create(const struct vport_parms *parms)
 84{
 85	struct vport *vport;
 86
 87	vport = gre_tnl_create(parms);
 88	if (IS_ERR(vport))
 89		return vport;
 90
 91	return ovs_netdev_link(vport, parms->name);
 92}
 93
 94static struct vport_ops ovs_gre_vport_ops = {
 95	.type		= OVS_VPORT_TYPE_GRE,
 96	.create		= gre_create,
 97	.send		= dev_queue_xmit,
 98	.destroy	= ovs_netdev_tunnel_destroy,
 99};
100
101static int __init ovs_gre_tnl_init(void)
102{
103	return ovs_vport_ops_register(&ovs_gre_vport_ops);
104}
105
106static void __exit ovs_gre_tnl_exit(void)
107{
108	ovs_vport_ops_unregister(&ovs_gre_vport_ops);
109}
110
111module_init(ovs_gre_tnl_init);
112module_exit(ovs_gre_tnl_exit);
113
114MODULE_DESCRIPTION("OVS: GRE switching port");
115MODULE_LICENSE("GPL");
116MODULE_ALIAS("vport-type-3");