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
27static struct vport_ops ovs_geneve_vport_ops;
28/**
29 * struct geneve_port - Keeps track of open UDP ports
30 * @dst_port: destination port.
31 */
32struct geneve_port {
33	u16 dst_port;
34};
35
36static inline struct geneve_port *geneve_vport(const struct vport *vport)
37{
38	return vport_priv(vport);
39}
40
41static 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
51static 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;
102error:
103	return ERR_PTR(err);
104}
105
106static 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
117static 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
125static int __init ovs_geneve_tnl_init(void)
126{
127	return ovs_vport_ops_register(&ovs_geneve_vport_ops);
128}
129
130static void __exit ovs_geneve_tnl_exit(void)
131{
132	ovs_vport_ops_unregister(&ovs_geneve_vport_ops);
133}
134
135module_init(ovs_geneve_tnl_init);
136module_exit(ovs_geneve_tnl_exit);
137
138MODULE_DESCRIPTION("OVS: Geneve switching port");
139MODULE_LICENSE("GPL");
140MODULE_ALIAS("vport-type-5");
141