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dcc38c03 TG |
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, | |
c868ee70 | 93 | .flags = VXLAN_F_COLLECT_METADATA | VXLAN_F_UDP_ZERO_CSUM6_RX, |
7e059158 DW |
94 | /* Don't restrict the packets that can be sent by MTU */ |
95 | .mtu = IP_MAX_MTU, | |
dcc38c03 TG |
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; | |
136 | error: | |
137 | return ERR_PTR(err); | |
138 | } | |
139 | ||
140 | static 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 | ||
dcc38c03 TG |
151 | static struct vport_ops ovs_vxlan_netdev_vport_ops = { |
152 | .type = OVS_VPORT_TYPE_VXLAN, | |
153 | .create = vxlan_create, | |
a9020fde | 154 | .destroy = ovs_netdev_tunnel_destroy, |
dcc38c03 | 155 | .get_options = vxlan_get_options, |
aec15924 | 156 | .send = dev_queue_xmit, |
dcc38c03 TG |
157 | }; |
158 | ||
159 | static int __init ovs_vxlan_tnl_init(void) | |
160 | { | |
161 | return ovs_vport_ops_register(&ovs_vxlan_netdev_vport_ops); | |
162 | } | |
163 | ||
164 | static void __exit ovs_vxlan_tnl_exit(void) | |
165 | { | |
166 | ovs_vport_ops_unregister(&ovs_vxlan_netdev_vport_ops); | |
167 | } | |
168 | ||
169 | module_init(ovs_vxlan_tnl_init); | |
170 | module_exit(ovs_vxlan_tnl_exit); | |
171 | ||
172 | MODULE_DESCRIPTION("OVS: VXLAN switching port"); | |
173 | MODULE_LICENSE("GPL"); | |
174 | MODULE_ALIAS("vport-type-4"); |