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
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
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
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 rtnl_unlock();
130 return vport;
131 error:
132 return ERR_PTR(err);
133 }
134
135 static 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
146 static 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
154 static int __init ovs_vxlan_tnl_init(void)
155 {
156 return ovs_vport_ops_register(&ovs_vxlan_netdev_vport_ops);
157 }
158
159 static void __exit ovs_vxlan_tnl_exit(void)
160 {
161 ovs_vport_ops_unregister(&ovs_vxlan_netdev_vport_ops);
162 }
163
164 module_init(ovs_vxlan_tnl_init);
165 module_exit(ovs_vxlan_tnl_exit);
166
167 MODULE_DESCRIPTION("OVS: VXLAN switching port");
168 MODULE_LICENSE("GPL");
169 MODULE_ALIAS("vport-type-4");
170
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