1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2014 Nicira, Inc.
4 * Copyright (c) 2013 Cisco Systems, Inc.
5 */
6
7#include <linux/kernel.h>
8#include <linux/skbuff.h>
9#include <linux/openvswitch.h>
10#include <linux/module.h>
11#include <net/udp.h>
12#include <net/ip_tunnels.h>
13#include <net/rtnetlink.h>
14#include <net/vxlan.h>
15
16#include "datapath.h"
17#include "vport.h"
18#include "vport-netdev.h"
19
20static struct vport_ops ovs_vxlan_netdev_vport_ops;
21
22static int vxlan_get_options(const struct vport *vport, struct sk_buff *skb)
23{
24	struct vxlan_dev *vxlan = netdev_priv(vport->dev);
25	__be16 dst_port = vxlan->cfg.dst_port;
26
27	if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, ntohs(dst_port)))
28		return -EMSGSIZE;
29
30	if (vxlan->cfg.flags & VXLAN_F_GBP) {
31		struct nlattr *exts;
32
33		exts = nla_nest_start_noflag(skb, OVS_TUNNEL_ATTR_EXTENSION);
34		if (!exts)
35			return -EMSGSIZE;
36
37		if (vxlan->cfg.flags & VXLAN_F_GBP &&
38		    nla_put_flag(skb, OVS_VXLAN_EXT_GBP))
39			return -EMSGSIZE;
40
41		nla_nest_end(skb, exts);
42	}
43
44	return 0;
45}
46
47static const struct nla_policy exts_policy[OVS_VXLAN_EXT_MAX + 1] = {
48	[OVS_VXLAN_EXT_GBP]	= { .type = NLA_FLAG, },
49};
50
51static int vxlan_configure_exts(struct vport *vport, struct nlattr *attr,
52				struct vxlan_config *conf)
53{
54	struct nlattr *exts[OVS_VXLAN_EXT_MAX + 1];
55	int err;
56
57	if (nla_len(attr) < sizeof(struct nlattr))
58		return -EINVAL;
59
60	err = nla_parse_nested_deprecated(exts, OVS_VXLAN_EXT_MAX, attr,
61					  exts_policy, NULL);
62	if (err < 0)
63		return err;
64
65	if (exts[OVS_VXLAN_EXT_GBP])
66		conf->flags |= VXLAN_F_GBP;
67
68	return 0;
69}
70
71static struct vport *vxlan_tnl_create(const struct vport_parms *parms)
72{
73	struct net *net = ovs_dp_get_net(parms->dp);
74	struct nlattr *options = parms->options;
75	struct net_device *dev;
76	struct vport *vport;
77	struct nlattr *a;
78	int err;
79	struct vxlan_config conf = {
80		.no_share = true,
81		.flags = VXLAN_F_COLLECT_METADATA | VXLAN_F_UDP_ZERO_CSUM6_RX,
82		/* Don't restrict the packets that can be sent by MTU */
83		.mtu = IP_MAX_MTU,
84	};
85
86	if (!options) {
87		err = -EINVAL;
88		goto error;
89	}
90
91	a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT);
92	if (a && nla_len(a) == sizeof(u16)) {
93		conf.dst_port = htons(nla_get_u16(a));
94	} else {
95		/* Require destination port from userspace. */
96		err = -EINVAL;
97		goto error;
98	}
99
100	vport = ovs_vport_alloc(0, &ovs_vxlan_netdev_vport_ops, parms);
101	if (IS_ERR(vport))
102		return vport;
103
104	a = nla_find_nested(options, OVS_TUNNEL_ATTR_EXTENSION);
105	if (a) {
106		err = vxlan_configure_exts(vport, a, &conf);
107		if (err) {
108			ovs_vport_free(vport);
109			goto error;
110		}
111	}
112
113	rtnl_lock();
114	dev = vxlan_dev_create(net, parms->name, NET_NAME_USER, &conf);
115	if (IS_ERR(dev)) {
116		rtnl_unlock();
117		ovs_vport_free(vport);
118		return ERR_CAST(dev);
119	}
120
121	err = dev_change_flags(dev, dev->flags | IFF_UP, NULL);
122	if (err < 0) {
123		rtnl_delete_link(dev, 0, NULL);
124		rtnl_unlock();
125		ovs_vport_free(vport);
126		goto error;
127	}
128
129	rtnl_unlock();
130	return vport;
131error:
132	return ERR_PTR(err);
133}
134
135static struct vport *vxlan_create(const struct vport_parms *parms)
136{
137	struct vport *vport;
138
139	vport = vxlan_tnl_create(parms);
140	if (IS_ERR(vport))
141		return vport;
142
143	return ovs_netdev_link(vport, parms->name);
144}
145
146static struct vport_ops ovs_vxlan_netdev_vport_ops = {
147	.type			= OVS_VPORT_TYPE_VXLAN,
148	.create			= vxlan_create,
149	.destroy		= ovs_netdev_tunnel_destroy,
150	.get_options		= vxlan_get_options,
151	.send			= dev_queue_xmit,
152};
153
154static int __init ovs_vxlan_tnl_init(void)
155{
156	return ovs_vport_ops_register(&ovs_vxlan_netdev_vport_ops);
157}
158
159static void __exit ovs_vxlan_tnl_exit(void)
160{
161	ovs_vport_ops_unregister(&ovs_vxlan_netdev_vport_ops);
162}
163
164module_init(ovs_vxlan_tnl_init);
165module_exit(ovs_vxlan_tnl_exit);
166
167MODULE_DESCRIPTION("OVS: VXLAN switching port");
168MODULE_LICENSE("GPL");
169MODULE_ALIAS("vport-type-4");
170