2 * Copyright (c) 2015 Nicira, Inc.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14 #include <linux/net.h>
15 #include <linux/rculist.h>
16 #include <linux/udp.h>
17 #include <linux/if_vlan.h>
18 #include <linux/module.h>
23 #include <net/route.h>
30 #include "vport-netdev.h"
33 static struct vport_ops ovs_stt_vport_ops;
35 * struct stt_port - Keeps track of open UDP ports
36 * @dst_port: destination port.
42 static inline struct stt_port *stt_vport(const struct vport *vport)
44 return vport_priv(vport);
47 static int stt_get_options(const struct vport *vport,
50 struct stt_port *stt_port = stt_vport(vport);
52 if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, stt_port->port_no))
57 static int stt_get_egress_tun_info(struct vport *vport, struct sk_buff *skb,
58 struct dp_upcall_info *upcall)
60 struct stt_port *stt_port = stt_vport(vport);
61 struct net *net = ovs_dp_get_net(vport->dp);
62 __be16 dport = htons(stt_port->port_no);
63 __be16 sport = udp_flow_src_port(net, skb, 1, USHRT_MAX, true);
65 return ovs_tunnel_get_egress_info(upcall, ovs_dp_get_net(vport->dp),
66 skb, IPPROTO_UDP, sport, dport);
69 static struct vport *stt_tnl_create(const struct vport_parms *parms)
71 struct net *net = ovs_dp_get_net(parms->dp);
72 struct nlattr *options = parms->options;
73 struct stt_port *stt_port;
74 struct net_device *dev;
85 a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT);
86 if (a && nla_len(a) == sizeof(u16)) {
87 dst_port = nla_get_u16(a);
89 /* Require destination port from userspace. */
94 vport = ovs_vport_alloc(sizeof(struct stt_port),
95 &ovs_stt_vport_ops, parms);
99 stt_port = stt_vport(vport);
100 stt_port->port_no = dst_port;
103 dev = stt_dev_create_fb(net, parms->name, NET_NAME_USER, dst_port);
106 ovs_vport_free(vport);
107 return ERR_CAST(dev);
110 dev_change_flags(dev, dev->flags | IFF_UP);
117 static struct vport *stt_create(const struct vport_parms *parms)
121 vport = stt_tnl_create(parms);
125 return ovs_netdev_link(vport, parms->name);
128 static struct vport_ops ovs_stt_vport_ops = {
129 .type = OVS_VPORT_TYPE_STT,
130 .create = stt_create,
131 .destroy = ovs_netdev_tunnel_destroy,
132 .get_options = stt_get_options,
133 .send = ovs_stt_xmit,
134 .get_egress_tun_info = stt_get_egress_tun_info,
137 static int __init ovs_stt_tnl_init(void)
139 return ovs_vport_ops_register(&ovs_stt_vport_ops);
142 static void __exit ovs_stt_tnl_exit(void)
144 ovs_vport_ops_unregister(&ovs_stt_vport_ops);
147 module_init(ovs_stt_tnl_init);
148 module_exit(ovs_stt_tnl_exit);
150 MODULE_DESCRIPTION("OVS: STT switching port");
151 MODULE_LICENSE("GPL");
152 MODULE_ALIAS("vport-type-106");