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 struct vport *stt_tnl_create(const struct vport_parms *parms)
  58 {
  59         struct net *net = ovs_dp_get_net(parms->dp);
  60         struct nlattr *options = parms->options;
  61         struct stt_port *stt_port;
  62         struct net_device *dev;
  63         struct vport *vport;
  64         struct nlattr *a;
  65         u16 dst_port;
  66         int err;
  67
  68         if (!options) {
  69                 err = -EINVAL;
  70                 goto error;
  71         }
  72
  73         a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT);
  74         if (a && nla_len(a) == sizeof(u16)) {
  75                 dst_port = nla_get_u16(a);
  76         } else {
  77                 /* Require destination port from userspace. */
  78                 err = -EINVAL;
  79                 goto error;
  80         }
  81
  82         vport = ovs_vport_alloc(sizeof(struct stt_port),
  83                                 &ovs_stt_vport_ops, parms);
  84         if (IS_ERR(vport))
  85                 return vport;
  86
  87         stt_port = stt_vport(vport);
  88         stt_port->port_no = dst_port;
  89
  90         rtnl_lock();
  91         dev = stt_dev_create_fb(net, parms->name, NET_NAME_USER, dst_port);
  92         if (IS_ERR(dev)) {
  93                 rtnl_unlock();
  94                 ovs_vport_free(vport);
  95                 return ERR_CAST(dev);
  96         }
  97
  98         err = dev_change_flags(dev, dev->flags | IFF_UP, NULL);
  99         if (err < 0) {
 100                 rtnl_delete_link(dev);
 101                 rtnl_unlock();
 102                 ovs_vport_free(vport);
 103                 goto error;
 104         }
 105
 106         rtnl_unlock();
 107         return vport;
 108 error:
 109         return ERR_PTR(err);
 110 }
 111
 112 static struct vport *stt_create(const struct vport_parms *parms)
 113 {
 114         struct vport *vport;
 115
 116         vport = stt_tnl_create(parms);
 117         if (IS_ERR(vport))
 118                 return vport;
 119
 120         return ovs_netdev_link(vport, parms->name);
 121 }
 122
 123 static struct vport_ops ovs_stt_vport_ops = {
 124         .type           = OVS_VPORT_TYPE_STT,
 125         .create         = stt_create,
 126         .destroy        = ovs_netdev_tunnel_destroy,
 127         .get_options    = stt_get_options,
 128 #ifndef USE_UPSTREAM_TUNNEL
 129         .fill_metadata_dst = stt_fill_metadata_dst,
 130 #endif
 131         .send           = ovs_stt_xmit,
 132 };
 133
 134 static int __init ovs_stt_tnl_init(void)
 135 {
 136         return ovs_vport_ops_register(&ovs_stt_vport_ops);
 137 }
 138
 139 static void __exit ovs_stt_tnl_exit(void)
 140 {
 141         ovs_vport_ops_unregister(&ovs_stt_vport_ops);
 142 }
 143
 144 module_init(ovs_stt_tnl_init);
 145 module_exit(ovs_stt_tnl_exit);
 146
 147 MODULE_DESCRIPTION("OVS: STT switching port");
 148 MODULE_LICENSE("GPL");
 149 MODULE_ALIAS("vport-type-106");
 150 #endif