tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (c) 2014 Nicira, Inc.
3 * Copyright (c) 2013 Cisco Systems, Inc.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of version 2 of the GNU General Public
7 * License as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
17 * 02110-1301, USA
18 */
19
20#include <linux/kernel.h>
21#include <linux/skbuff.h>
22#include <linux/openvswitch.h>
23#include <linux/module.h>
24#include <net/udp.h>
25#include <net/ip_tunnels.h>
26#include <net/rtnetlink.h>
27#include <net/vxlan.h>
28
29#include "datapath.h"
30#include "vport.h"
31#include "vport-netdev.h"
32
33static struct vport_ops ovs_vxlan_netdev_vport_ops;
34
35static int vxlan_get_options(const struct vport *vport, struct sk_buff *skb)
36{
37 struct vxlan_dev *vxlan = netdev_priv(vport->dev);
38 __be16 dst_port = vxlan->cfg.dst_port;
39
40 if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, ntohs(dst_port)))
41 return -EMSGSIZE;
42
43 if (vxlan->flags & VXLAN_F_GBP) {
44 struct nlattr *exts;
45
46 exts = nla_nest_start(skb, OVS_TUNNEL_ATTR_EXTENSION);
47 if (!exts)
48 return -EMSGSIZE;
49
50 if (vxlan->flags & VXLAN_F_GBP &&
51 nla_put_flag(skb, OVS_VXLAN_EXT_GBP))
52 return -EMSGSIZE;
53
54 nla_nest_end(skb, exts);
55 }
56
57 return 0;
58}
59
60static const struct nla_policy exts_policy[OVS_VXLAN_EXT_MAX + 1] = {
61 [OVS_VXLAN_EXT_GBP] = { .type = NLA_FLAG, },
62};
63
64static int vxlan_configure_exts(struct vport *vport, struct nlattr *attr,
65 struct vxlan_config *conf)
66{
67 struct nlattr *exts[OVS_VXLAN_EXT_MAX + 1];
68 int err;
69
70 if (nla_len(attr) < sizeof(struct nlattr))
71 return -EINVAL;
72
73 err = nla_parse_nested(exts, OVS_VXLAN_EXT_MAX, attr, exts_policy);
74 if (err < 0)
75 return err;
76
77 if (exts[OVS_VXLAN_EXT_GBP])
78 conf->flags |= VXLAN_F_GBP;
79
80 return 0;
81}
82
83static struct vport *vxlan_tnl_create(const struct vport_parms *parms)
84{
85 struct net *net = ovs_dp_get_net(parms->dp);
86 struct nlattr *options = parms->options;
87 struct net_device *dev;
88 struct vport *vport;
89 struct nlattr *a;
90 int err;
91 struct vxlan_config conf = {
92 .no_share = true,
93 .flags = VXLAN_F_COLLECT_METADATA | VXLAN_F_UDP_ZERO_CSUM6_RX,
94 /* Don't restrict the packets that can be sent by MTU */
95 .mtu = IP_MAX_MTU,
96 };
97
98 if (!options) {
99 err = -EINVAL;
100 goto error;
101 }
102
103 a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT);
104 if (a && nla_len(a) == sizeof(u16)) {
105 conf.dst_port = htons(nla_get_u16(a));
106 } else {
107 /* Require destination port from userspace. */
108 err = -EINVAL;
109 goto error;
110 }
111
112 vport = ovs_vport_alloc(0, &ovs_vxlan_netdev_vport_ops, parms);
113 if (IS_ERR(vport))
114 return vport;
115
116 a = nla_find_nested(options, OVS_TUNNEL_ATTR_EXTENSION);
117 if (a) {
118 err = vxlan_configure_exts(vport, a, &conf);
119 if (err) {
120 ovs_vport_free(vport);
121 goto error;
122 }
123 }
124
125 rtnl_lock();
126 dev = vxlan_dev_create(net, parms->name, NET_NAME_USER, &conf);
127 if (IS_ERR(dev)) {
128 rtnl_unlock();
129 ovs_vport_free(vport);
130 return ERR_CAST(dev);
131 }
132
133 dev_change_flags(dev, dev->flags | IFF_UP);
134 rtnl_unlock();
135 return vport;
136error:
137 return ERR_PTR(err);
138}
139
140static struct vport *vxlan_create(const struct vport_parms *parms)
141{
142 struct vport *vport;
143
144 vport = vxlan_tnl_create(parms);
145 if (IS_ERR(vport))
146 return vport;
147
148 return ovs_netdev_link(vport, parms->name);
149}
150
151static struct vport_ops ovs_vxlan_netdev_vport_ops = {
152 .type = OVS_VPORT_TYPE_VXLAN,
153 .create = vxlan_create,
154 .destroy = ovs_netdev_tunnel_destroy,
155 .get_options = vxlan_get_options,
156 .send = dev_queue_xmit,
157};
158
159static int __init ovs_vxlan_tnl_init(void)
160{
161 return ovs_vport_ops_register(&ovs_vxlan_netdev_vport_ops);
162}
163
164static void __exit ovs_vxlan_tnl_exit(void)
165{
166 ovs_vport_ops_unregister(&ovs_vxlan_netdev_vport_ops);
167}
168
169module_init(ovs_vxlan_tnl_init);
170module_exit(ovs_vxlan_tnl_exit);
171
172MODULE_DESCRIPTION("OVS: VXLAN switching port");
173MODULE_LICENSE("GPL");
174MODULE_ALIAS("vport-type-4");