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1 /*
2 * Copyright (c) 2015 Nicira, Inc.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 */
9
10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11
12 #include <linux/in.h>
13 #include <linux/ip.h>
14 #include <linux/net.h>
15 #include <linux/rculist.h>
16 #include <linux/udp.h>
17 #include <linux/if_vlan.h>
18 #include <linux/module.h>
19
20 #include <net/lisp.h>
21 #include <net/icmp.h>
22 #include <net/ip.h>
23 #include <net/route.h>
24 #include <net/udp.h>
25 #include <net/xfrm.h>
26
27 #include "datapath.h"
28 #include "vport.h"
29 #include "vport-netdev.h"
30
31 static struct vport_ops ovs_lisp_vport_ops;
32 /**
33 * struct lisp_port - Keeps track of open UDP ports
34 * @dst_port: destination port.
35 */
36 struct lisp_port {
37 u16 port_no;
38 };
39
40 static inline struct lisp_port *lisp_vport(const struct vport *vport)
41 {
42 return vport_priv(vport);
43 }
44
45 static int lisp_get_options(const struct vport *vport,
46 struct sk_buff *skb)
47 {
48 struct lisp_port *lisp_port = lisp_vport(vport);
49
50 if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, lisp_port->port_no))
51 return -EMSGSIZE;
52 return 0;
53 }
54
55 static struct vport *lisp_tnl_create(const struct vport_parms *parms)
56 {
57 struct net *net = ovs_dp_get_net(parms->dp);
58 struct nlattr *options = parms->options;
59 struct lisp_port *lisp_port;
60 struct net_device *dev;
61 struct vport *vport;
62 struct nlattr *a;
63 u16 dst_port;
64 int err;
65
66 if (!options) {
67 err = -EINVAL;
68 goto error;
69 }
70
71 a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT);
72 if (a && nla_len(a) == sizeof(u16)) {
73 dst_port = nla_get_u16(a);
74 } else {
75 /* Require destination port from userspace. */
76 err = -EINVAL;
77 goto error;
78 }
79
80 vport = ovs_vport_alloc(sizeof(struct lisp_port),
81 &ovs_lisp_vport_ops, parms);
82 if (IS_ERR(vport))
83 return vport;
84
85 lisp_port = lisp_vport(vport);
86 lisp_port->port_no = dst_port;
87
88 rtnl_lock();
89 dev = lisp_dev_create_fb(net, parms->name, NET_NAME_USER, dst_port);
90 if (IS_ERR(dev)) {
91 rtnl_unlock();
92 ovs_vport_free(vport);
93 return ERR_CAST(dev);
94 }
95 err = dev_change_flags(dev, dev->flags | IFF_UP, NULL);
96 if (err < 0) {
97 rtnl_delete_link(dev);
98 rtnl_unlock();
99 ovs_vport_free(vport);
100 goto error;
101 }
102
103 rtnl_unlock();
104 return vport;
105 error:
106 return ERR_PTR(err);
107 }
108
109 static struct vport *lisp_create(const struct vport_parms *parms)
110 {
111 struct vport *vport;
112
113 vport = lisp_tnl_create(parms);
114 if (IS_ERR(vport))
115 return vport;
116
117 return ovs_netdev_link(vport, parms->name);
118 }
119
120 static struct vport_ops ovs_lisp_vport_ops = {
121 .type = OVS_VPORT_TYPE_LISP,
122 .create = lisp_create,
123 .destroy = ovs_netdev_tunnel_destroy,
124 .get_options = lisp_get_options,
125 #ifndef USE_UPSTREAM_TUNNEL
126 .fill_metadata_dst = lisp_fill_metadata_dst,
127 #endif
128 .send = lisp_xmit,
129 };
130
131 static int __init ovs_lisp_tnl_init(void)
132 {
133 return ovs_vport_ops_register(&ovs_lisp_vport_ops);
134 }
135
136 static void __exit ovs_lisp_tnl_exit(void)
137 {
138 ovs_vport_ops_unregister(&ovs_lisp_vport_ops);
139 }
140
141 module_init(ovs_lisp_tnl_init);
142 module_exit(ovs_lisp_tnl_exit);
143
144 MODULE_DESCRIPTION("OVS: Lisp switching port");
145 MODULE_LICENSE("GPL");
146 MODULE_ALIAS("vport-type-105");