1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Copyright (c) 2014 Nicira, Inc.
4  */
5 
6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
7 
8 #include <linux/in.h>
9 #include <linux/ip.h>
10 #include <linux/net.h>
11 #include <linux/rculist.h>
12 #include <linux/udp.h>
13 #include <linux/if_vlan.h>
14 #include <linux/module.h>
15 
16 #include <net/geneve.h>
17 #include <net/icmp.h>
18 #include <net/ip.h>
19 #include <net/route.h>
20 #include <net/udp.h>
21 #include <net/xfrm.h>
22 
23 #include "datapath.h"
24 #include "vport.h"
25 #include "vport-netdev.h"
26 
27 static struct vport_ops ovs_geneve_vport_ops;
28 /**
29  * struct geneve_port - Keeps track of open UDP ports
30  * @dst_port: destination port.
31  */
32 struct geneve_port {
33 	u16 dst_port;
34 };
35 
36 static inline struct geneve_port *geneve_vport(const struct vport *vport)
37 {
38 	return vport_priv(vport);
39 }
40 
41 static int geneve_get_options(const struct vport *vport,
42 			      struct sk_buff *skb)
43 {
44 	struct geneve_port *geneve_port = geneve_vport(vport);
45 
46 	if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, geneve_port->dst_port))
47 		return -EMSGSIZE;
48 	return 0;
49 }
50 
51 static struct vport *geneve_tnl_create(const struct vport_parms *parms)
52 {
53 	struct net *net = ovs_dp_get_net(parms->dp);
54 	struct nlattr *options = parms->options;
55 	struct geneve_port *geneve_port;
56 	struct net_device *dev;
57 	struct vport *vport;
58 	struct nlattr *a;
59 	u16 dst_port;
60 	int err;
61 
62 	if (!options) {
63 		err = -EINVAL;
64 		goto error;
65 	}
66 
67 	a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT);
68 	if (a && nla_len(a) == sizeof(u16)) {
69 		dst_port = nla_get_u16(a);
70 	} else {
71 		/* Require destination port from userspace. */
72 		err = -EINVAL;
73 		goto error;
74 	}
75 
76 	vport = ovs_vport_alloc(sizeof(struct geneve_port),
77 				&ovs_geneve_vport_ops, parms);
78 	if (IS_ERR(vport))
79 		return vport;
80 
81 	geneve_port = geneve_vport(vport);
82 	geneve_port->dst_port = dst_port;
83 
84 	rtnl_lock();
85 	dev = geneve_dev_create_fb(net, parms->name, NET_NAME_USER, dst_port);
86 	if (IS_ERR(dev)) {
87 		rtnl_unlock();
88 		ovs_vport_free(vport);
89 		return ERR_CAST(dev);
90 	}
91 
92 	err = dev_change_flags(dev, dev->flags | IFF_UP, NULL);
93 	if (err < 0) {
94 		rtnl_delete_link(dev, 0, NULL);
95 		rtnl_unlock();
96 		ovs_vport_free(vport);
97 		goto error;
98 	}
99 
100 	rtnl_unlock();
101 	return vport;
102 error:
103 	return ERR_PTR(err);
104 }
105 
106 static struct vport *geneve_create(const struct vport_parms *parms)
107 {
108 	struct vport *vport;
109 
110 	vport = geneve_tnl_create(parms);
111 	if (IS_ERR(vport))
112 		return vport;
113 
114 	return ovs_netdev_link(vport, parms->name);
115 }
116 
117 static struct vport_ops ovs_geneve_vport_ops = {
118 	.type		= OVS_VPORT_TYPE_GENEVE,
119 	.create		= geneve_create,
120 	.destroy	= ovs_netdev_tunnel_destroy,
121 	.get_options	= geneve_get_options,
122 	.send		= dev_queue_xmit,
123 };
124 
125 static int __init ovs_geneve_tnl_init(void)
126 {
127 	return ovs_vport_ops_register(&ovs_geneve_vport_ops);
128 }
129 
130 static void __exit ovs_geneve_tnl_exit(void)
131 {
132 	ovs_vport_ops_unregister(&ovs_geneve_vport_ops);
133 }
134 
135 module_init(ovs_geneve_tnl_init);
136 module_exit(ovs_geneve_tnl_exit);
137 
138 MODULE_DESCRIPTION("OVS: Geneve switching port");
139 MODULE_LICENSE("GPL");
140 MODULE_ALIAS("vport-type-5");
141