1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2007-2014 Nicira, Inc.
4 */
5
6#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
7
8#include <linux/if.h>
9#include <linux/skbuff.h>
10#include <linux/ip.h>
11#include <linux/if_tunnel.h>
12#include <linux/if_vlan.h>
13#include <linux/in.h>
14#include <linux/in_route.h>
15#include <linux/inetdevice.h>
16#include <linux/jhash.h>
17#include <linux/list.h>
18#include <linux/kernel.h>
19#include <linux/module.h>
20#include <linux/workqueue.h>
21#include <linux/rculist.h>
22#include <net/route.h>
23#include <net/xfrm.h>
24
25#include <net/icmp.h>
26#include <net/ip.h>
27#include <net/ip_tunnels.h>
28#include <net/gre.h>
29#include <net/net_namespace.h>
30#include <net/netns/generic.h>
31#include <net/protocol.h>
32
33#include "datapath.h"
34#include "vport.h"
35#include "vport-netdev.h"
36
37static struct vport_ops ovs_gre_vport_ops;
38
39static struct vport *gre_tnl_create(const struct vport_parms *parms)
40{
41	struct net *net = ovs_dp_get_net(parms->dp);
42	struct net_device *dev;
43	struct vport *vport;
44	int err;
45
46	vport = ovs_vport_alloc(0, &ovs_gre_vport_ops, parms);
47	if (IS_ERR(vport))
48		return vport;
49
50	rtnl_lock();
51	dev = gretap_fb_dev_create(net, parms->name, NET_NAME_USER);
52	if (IS_ERR(dev)) {
53		rtnl_unlock();
54		ovs_vport_free(vport);
55		return ERR_CAST(dev);
56	}
57
58	err = dev_change_flags(dev, dev->flags | IFF_UP, NULL);
59	if (err < 0) {
60		rtnl_delete_link(dev, 0, NULL);
61		rtnl_unlock();
62		ovs_vport_free(vport);
63		return ERR_PTR(err);
64	}
65
66	rtnl_unlock();
67	return vport;
68}
69
70static struct vport *gre_create(const struct vport_parms *parms)
71{
72	struct vport *vport;
73
74	vport = gre_tnl_create(parms);
75	if (IS_ERR(vport))
76		return vport;
77
78	return ovs_netdev_link(vport, parms->name);
79}
80
81static struct vport_ops ovs_gre_vport_ops = {
82	.type		= OVS_VPORT_TYPE_GRE,
83	.create		= gre_create,
84	.send		= dev_queue_xmit,
85	.destroy	= ovs_netdev_tunnel_destroy,
86};
87
88static int __init ovs_gre_tnl_init(void)
89{
90	return ovs_vport_ops_register(&ovs_gre_vport_ops);
91}
92
93static void __exit ovs_gre_tnl_exit(void)
94{
95	ovs_vport_ops_unregister(&ovs_gre_vport_ops);
96}
97
98module_init(ovs_gre_tnl_init);
99module_exit(ovs_gre_tnl_exit);
100
101MODULE_DESCRIPTION("OVS: GRE switching port");
102MODULE_LICENSE("GPL");
103MODULE_ALIAS("vport-type-3");
104