net/openvswitch/vport-gre.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2007-2014 Nicira, Inc.
   4  */
   5
   6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   7
   8 #include <linux/if.h>
   9 #include <linux/skbuff.h>
  10 #include <linux/ip.h>
  11 #include <linux/if_tunnel.h>
  12 #include <linux/if_vlan.h>
  13 #include <linux/in.h>
  14 #include <linux/in_route.h>
  15 #include <linux/inetdevice.h>
  16 #include <linux/jhash.h>
  17 #include <linux/list.h>
  18 #include <linux/kernel.h>
  19 #include <linux/module.h>
  20 #include <linux/workqueue.h>
  21 #include <linux/rculist.h>
  22 #include <net/route.h>
  23 #include <net/xfrm.h>
  24
  25 #include <net/icmp.h>
  26 #include <net/ip.h>
  27 #include <net/ip_tunnels.h>
  28 #include <net/gre.h>
  29 #include <net/net_namespace.h>
  30 #include <net/netns/generic.h>
  31 #include <net/protocol.h>
  32
  33 #include "datapath.h"
  34 #include "vport.h"
  35 #include "vport-netdev.h"
  36
  37 static struct vport_ops ovs_gre_vport_ops;
  38
  39 static struct vport *gre_tnl_create(const struct vport_parms *parms)
  40 {
  41         struct net *net = ovs_dp_get_net(parms->dp);
  42         struct net_device *dev;
  43         struct vport *vport;
  44         int err;
  45
  46         vport = ovs_vport_alloc(0, &ovs_gre_vport_ops, parms);
  47         if (IS_ERR(vport))
  48                 return vport;
  49
  50         rtnl_lock();
  51         dev = gretap_fb_dev_create(net, parms->name, NET_NAME_USER);
  52         if (IS_ERR(dev)) {
  53                 rtnl_unlock();
  54                 ovs_vport_free(vport);
  55                 return ERR_CAST(dev);
  56         }
  57
  58         err = dev_change_flags(dev, dev->flags | IFF_UP, NULL);
  59         if (err < 0) {
  60                 rtnl_delete_link(dev, 0, NULL);
  61                 rtnl_unlock();
  62                 ovs_vport_free(vport);
  63                 return ERR_PTR(err);
  64         }
  65
  66         rtnl_unlock();
  67         return vport;
  68 }
  69
  70 static struct vport *gre_create(const struct vport_parms *parms)
  71 {
  72         struct vport *vport;
  73
  74         vport = gre_tnl_create(parms);
  75         if (IS_ERR(vport))
  76                 return vport;
  77
  78         return ovs_netdev_link(vport, parms->name);
  79 }
  80
  81 static struct vport_ops ovs_gre_vport_ops = {
  82         .type           = OVS_VPORT_TYPE_GRE,
  83         .create         = gre_create,
  84         .send           = dev_queue_xmit,
  85         .destroy        = ovs_netdev_tunnel_destroy,
  86 };
  87
  88 static int __init ovs_gre_tnl_init(void)
  89 {
  90         return ovs_vport_ops_register(&ovs_gre_vport_ops);
  91 }
  92
  93 static void __exit ovs_gre_tnl_exit(void)
  94 {
  95         ovs_vport_ops_unregister(&ovs_gre_vport_ops);
  96 }
  97
  98 module_init(ovs_gre_tnl_init);
  99 module_exit(ovs_gre_tnl_exit);
 100
 101 MODULE_DESCRIPTION("OVS: GRE switching port");
 102 MODULE_LICENSE("GPL");
 103 MODULE_ALIAS("vport-type-3");