datapath/vport-stt.c

   1 /*
   2  * Copyright (c) 2015 Nicira, Inc.
   3  *
   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.
   8  */
   9
  10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  11
  12 #include <linux/in.h>
  13 #include <linux/ip.h>
  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>
  19
  20 #include <net/stt.h>
  21 #include <net/icmp.h>
  22 #include <net/ip.h>
  23 #include <net/route.h>
  24 #include <net/udp.h>
  25 #include <net/xfrm.h>
  26 #include <net/stt.h>
  27
  28 #include "datapath.h"
  29 #include "vport.h"
  30 #include "vport-netdev.h"
  31
  32 #ifdef OVS_STT
  33 static struct vport_ops ovs_stt_vport_ops;
  34 /**
  35  * struct stt_port - Keeps track of open UDP ports
  36  * @dst_port: destination port.
  37  */
  38 struct stt_port {
  39         u16 port_no;
  40 };
  41
  42 static inline struct stt_port *stt_vport(const struct vport *vport)
  43 {
  44         return vport_priv(vport);
  45 }
  46
  47 static int stt_get_options(const struct vport *vport,
  48                               struct sk_buff *skb)
  49 {
  50         struct stt_port *stt_port = stt_vport(vport);
  51
  52         if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, stt_port->port_no))
  53                 return -EMSGSIZE;
  54         return 0;
  55 }
  56
  57 static int stt_get_egress_tun_info(struct vport *vport, struct sk_buff *skb,
  58                                       struct dp_upcall_info *upcall)
  59 {
  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);
  64
  65         return ovs_tunnel_get_egress_info(upcall, ovs_dp_get_net(vport->dp),
  66                                           skb, IPPROTO_UDP, sport, dport);
  67 }
  68
  69 static struct vport *stt_tnl_create(const struct vport_parms *parms)
  70 {
  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;
  75         struct vport *vport;
  76         struct nlattr *a;
  77         u16 dst_port;
  78         int err;
  79
  80         if (!options) {
  81                 err = -EINVAL;
  82                 goto error;
  83         }
  84
  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);
  88         } else {
  89                 /* Require destination port from userspace. */
  90                 err = -EINVAL;
  91                 goto error;
  92         }
  93
  94         vport = ovs_vport_alloc(sizeof(struct stt_port),
  95                                 &ovs_stt_vport_ops, parms);
  96         if (IS_ERR(vport))
  97                 return vport;
  98
  99         stt_port = stt_vport(vport);
 100         stt_port->port_no = dst_port;
 101
 102         rtnl_lock();
 103         dev = stt_dev_create_fb(net, parms->name, NET_NAME_USER, dst_port);
 104         if (IS_ERR(dev)) {
 105                 rtnl_unlock();
 106                 ovs_vport_free(vport);
 107                 return ERR_CAST(dev);
 108         }
 109
 110         dev_change_flags(dev, dev->flags | IFF_UP);
 111         rtnl_unlock();
 112         return vport;
 113 error:
 114         return ERR_PTR(err);
 115 }
 116
 117 static struct vport *stt_create(const struct vport_parms *parms)
 118 {
 119         struct vport *vport;
 120
 121         vport = stt_tnl_create(parms);
 122         if (IS_ERR(vport))
 123                 return vport;
 124
 125         return ovs_netdev_link(vport, parms->name);
 126 }
 127
 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         .owner          = THIS_MODULE,
 135         .get_egress_tun_info    = stt_get_egress_tun_info,
 136 };
 137
 138 static int __init ovs_stt_tnl_init(void)
 139 {
 140         return ovs_vport_ops_register(&ovs_stt_vport_ops);
 141 }
 142
 143 static void __exit ovs_stt_tnl_exit(void)
 144 {
 145         ovs_vport_ops_unregister(&ovs_stt_vport_ops);
 146 }
 147
 148 module_init(ovs_stt_tnl_init);
 149 module_exit(ovs_stt_tnl_exit);
 150
 151 MODULE_DESCRIPTION("OVS: STT switching port");
 152 MODULE_LICENSE("GPL");
 153 MODULE_ALIAS("vport-type-106");
 154 #endif