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
20 static struct vport_ops ovs_vxlan_netdev_vport_ops;
21
vxlan_get_options(const struct vport * vport,struct sk_buff * skb)22 static 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
47 static const struct nla_policy exts_policy[OVS_VXLAN_EXT_MAX + 1] = {
48 [OVS_VXLAN_EXT_GBP] = { .type = NLA_FLAG, },
49 };
50
vxlan_configure_exts(struct vport * vport,struct nlattr * attr,struct vxlan_config * conf)51 static 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
vxlan_tnl_create(const struct vport_parms * parms)71 static 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 vport->dev = dev;
130 netdev_hold(vport->dev, &vport->dev_tracker, GFP_KERNEL);
131
132 rtnl_unlock();
133 return vport;
134 error:
135 return ERR_PTR(err);
136 }
137
vxlan_create(const struct vport_parms * parms)138 static struct vport *vxlan_create(const struct vport_parms *parms)
139 {
140 struct vport *vport;
141
142 vport = vxlan_tnl_create(parms);
143 if (IS_ERR(vport))
144 return vport;
145
146 return ovs_netdev_link(vport, true);
147 }
148
149 static struct vport_ops ovs_vxlan_netdev_vport_ops = {
150 .type = OVS_VPORT_TYPE_VXLAN,
151 .create = vxlan_create,
152 .destroy = ovs_netdev_tunnel_destroy,
153 .get_options = vxlan_get_options,
154 .send = dev_queue_xmit,
155 };
156
ovs_vxlan_tnl_init(void)157 static int __init ovs_vxlan_tnl_init(void)
158 {
159 return ovs_vport_ops_register(&ovs_vxlan_netdev_vport_ops);
160 }
161
ovs_vxlan_tnl_exit(void)162 static void __exit ovs_vxlan_tnl_exit(void)
163 {
164 ovs_vport_ops_unregister(&ovs_vxlan_netdev_vport_ops);
165 }
166
167 module_init(ovs_vxlan_tnl_init);
168 module_exit(ovs_vxlan_tnl_exit);
169
170 MODULE_DESCRIPTION("OVS: VXLAN switching port");
171 MODULE_LICENSE("GPL");
172 MODULE_ALIAS("vport-type-4");
173