xref: /openbmc/linux/net/openvswitch/vport-vxlan.c (revision 82003e04)
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 
33 static struct vport_ops ovs_vxlan_netdev_vport_ops;
34 
35 static 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 
60 static const struct nla_policy exts_policy[OVS_VXLAN_EXT_MAX + 1] = {
61 	[OVS_VXLAN_EXT_GBP]	= { .type = NLA_FLAG, },
62 };
63 
64 static 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 
83 static 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 	err = dev_change_flags(dev, dev->flags | IFF_UP);
134 	if (err < 0) {
135 		rtnl_delete_link(dev);
136 		rtnl_unlock();
137 		ovs_vport_free(vport);
138 		goto error;
139 	}
140 
141 	rtnl_unlock();
142 	return vport;
143 error:
144 	return ERR_PTR(err);
145 }
146 
147 static struct vport *vxlan_create(const struct vport_parms *parms)
148 {
149 	struct vport *vport;
150 
151 	vport = vxlan_tnl_create(parms);
152 	if (IS_ERR(vport))
153 		return vport;
154 
155 	return ovs_netdev_link(vport, parms->name);
156 }
157 
158 static struct vport_ops ovs_vxlan_netdev_vport_ops = {
159 	.type			= OVS_VPORT_TYPE_VXLAN,
160 	.create			= vxlan_create,
161 	.destroy		= ovs_netdev_tunnel_destroy,
162 	.get_options		= vxlan_get_options,
163 	.send			= dev_queue_xmit,
164 };
165 
166 static int __init ovs_vxlan_tnl_init(void)
167 {
168 	return ovs_vport_ops_register(&ovs_vxlan_netdev_vport_ops);
169 }
170 
171 static void __exit ovs_vxlan_tnl_exit(void)
172 {
173 	ovs_vport_ops_unregister(&ovs_vxlan_netdev_vport_ops);
174 }
175 
176 module_init(ovs_vxlan_tnl_init);
177 module_exit(ovs_vxlan_tnl_exit);
178 
179 MODULE_DESCRIPTION("OVS: VXLAN switching port");
180 MODULE_LICENSE("GPL");
181 MODULE_ALIAS("vport-type-4");
182