net/openvswitch/vport-gre.c

   1 /*
   2  * Copyright (c) 2007-2014 Nicira, Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of version 2 of the GNU General Public
   6  * License as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program; if not, write to the Free Software
  15  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  16  * 02110-1301, USA
  17  */
  18
  19 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  20
  21 #include <linux/if.h>
  22 #include <linux/skbuff.h>
  23 #include <linux/ip.h>
  24 #include <linux/if_tunnel.h>
  25 #include <linux/if_vlan.h>
  26 #include <linux/in.h>
  27 #include <linux/in_route.h>
  28 #include <linux/inetdevice.h>
  29 #include <linux/jhash.h>
  30 #include <linux/list.h>
  31 #include <linux/kernel.h>
  32 #include <linux/module.h>
  33 #include <linux/workqueue.h>
  34 #include <linux/rculist.h>
  35 #include <net/route.h>
  36 #include <net/xfrm.h>
  37
  38 #include <net/icmp.h>
  39 #include <net/ip.h>
  40 #include <net/ip_tunnels.h>
  41 #include <net/gre.h>
  42 #include <net/net_namespace.h>
  43 #include <net/netns/generic.h>
  44 #include <net/protocol.h>
  45
  46 #include "datapath.h"
  47 #include "vport.h"
  48 #include "vport-netdev.h"
  49
  50 static struct vport_ops ovs_gre_vport_ops;
  51
  52 static struct vport *gre_tnl_create(const struct vport_parms *parms)
  53 {
  54         struct net *net = ovs_dp_get_net(parms->dp);
  55         struct net_device *dev;
  56         struct vport *vport;
  57         int err;
  58
  59         vport = ovs_vport_alloc(0, &ovs_gre_vport_ops, parms);
  60         if (IS_ERR(vport))
  61                 return vport;
  62
  63         rtnl_lock();
  64         dev = gretap_fb_dev_create(net, parms->name, NET_NAME_USER);
  65         if (IS_ERR(dev)) {
  66                 rtnl_unlock();
  67                 ovs_vport_free(vport);
  68                 return ERR_CAST(dev);
  69         }
  70
  71         err = dev_change_flags(dev, dev->flags | IFF_UP);
  72         if (err < 0) {
  73                 rtnl_delete_link(dev);
  74                 rtnl_unlock();
  75                 ovs_vport_free(vport);
  76                 return ERR_PTR(err);
  77         }
  78
  79         rtnl_unlock();
  80         return vport;
  81 }
  82
  83 static struct vport *gre_create(const struct vport_parms *parms)
  84 {
  85         struct vport *vport;
  86
  87         vport = gre_tnl_create(parms);
  88         if (IS_ERR(vport))
  89                 return vport;
  90
  91         return ovs_netdev_link(vport, parms->name);
  92 }
  93
  94 static struct vport_ops ovs_gre_vport_ops = {
  95         .type           = OVS_VPORT_TYPE_GRE,
  96         .create         = gre_create,
  97         .send           = dev_queue_xmit,
  98         .destroy        = ovs_netdev_tunnel_destroy,
  99 };
 100
 101 static int __init ovs_gre_tnl_init(void)
 102 {
 103         return ovs_vport_ops_register(&ovs_gre_vport_ops);
 104 }
 105
 106 static void __exit ovs_gre_tnl_exit(void)
 107 {
 108         ovs_vport_ops_unregister(&ovs_gre_vport_ops);
 109 }
 110
 111 module_init(ovs_gre_tnl_init);
 112 module_exit(ovs_gre_tnl_exit);
 113
 114 MODULE_DESCRIPTION("OVS: GRE switching port");
 115 MODULE_LICENSE("GPL");
 116 MODULE_ALIAS("vport-type-3");