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(dev: vport->dev); |
25 | __be16 dst_port = vxlan->cfg.dst_port; |
26 | |
27 | if (nla_put_u16(skb, attrtype: 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, attrtype: OVS_TUNNEL_ATTR_EXTENSION); |
34 | if (!exts) |
35 | return -EMSGSIZE; |
36 | |
37 | if (vxlan->cfg.flags & VXLAN_F_GBP && |
38 | nla_put_flag(skb, attrtype: OVS_VXLAN_EXT_GBP)) |
39 | return -EMSGSIZE; |
40 | |
41 | nla_nest_end(skb, start: 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(nla: attr) < sizeof(struct nlattr)) |
58 | return -EINVAL; |
59 | |
60 | err = nla_parse_nested_deprecated(tb: exts, OVS_VXLAN_EXT_MAX, nla: attr, |
61 | policy: 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(dp: 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(nla: options, attrtype: OVS_TUNNEL_ATTR_DST_PORT); |
92 | if (a && nla_len(nla: 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(priv_size: 0, &ovs_vxlan_netdev_vport_ops, parms); |
101 | if (IS_ERR(ptr: vport)) |
102 | return vport; |
103 | |
104 | a = nla_find_nested(nla: options, attrtype: OVS_TUNNEL_ATTR_EXTENSION); |
105 | if (a) { |
106 | err = vxlan_configure_exts(vport, attr: a, conf: &conf); |
107 | if (err) { |
108 | ovs_vport_free(vport); |
109 | goto error; |
110 | } |
111 | } |
112 | |
113 | rtnl_lock(); |
114 | dev = vxlan_dev_create(net, name: parms->name, NET_NAME_USER, conf: &conf); |
115 | if (IS_ERR(ptr: dev)) { |
116 | rtnl_unlock(); |
117 | ovs_vport_free(vport); |
118 | return ERR_CAST(ptr: dev); |
119 | } |
120 | |
121 | err = dev_change_flags(dev, flags: dev->flags | IFF_UP, NULL); |
122 | if (err < 0) { |
123 | rtnl_delete_link(dev, portid: 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(error: 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(ptr: vport)) |
141 | return vport; |
142 | |
143 | return ovs_netdev_link(vport, name: 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(ops: &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 | |