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
37 static struct vport_ops ovs_gre_vport_ops;
38
39 static 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
70 static 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
81 static 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
88 static int __init ovs_gre_tnl_init(void)
89 {
90 return ovs_vport_ops_register(&ovs_gre_vport_ops);
91 }
92
93 static void __exit ovs_gre_tnl_exit(void)
94 {
95 ovs_vport_ops_unregister(&ovs_gre_vport_ops);
96 }
97
98 module_init(ovs_gre_tnl_init);
99 module_exit(ovs_gre_tnl_exit);
100
101 MODULE_DESCRIPTION("OVS: GRE switching port");
102 MODULE_LICENSE("GPL");
103 MODULE_ALIAS("vport-type-3");
104
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