Eric Lee / smarc-fsl-linux-kernel

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net/openvswitch/vport-gre.c 2.75 KB
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81f7e3824   Eric Lee   Initial Release, ... 
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  /*
   * Copyright (c) 2007-2014 Nicira, Inc.
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of version 2 of the GNU General Public
   * License as published by the Free Software Foundation.
   *
   * This program is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
   * General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
   * 02110-1301, USA
   */
  
  #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  
  #include <linux/if.h>
  #include <linux/skbuff.h>
  #include <linux/ip.h>
  #include <linux/if_tunnel.h>
  #include <linux/if_vlan.h>
  #include <linux/in.h>
  #include <linux/in_route.h>
  #include <linux/inetdevice.h>
  #include <linux/jhash.h>
  #include <linux/list.h>
  #include <linux/kernel.h>
  #include <linux/module.h>
  #include <linux/workqueue.h>
  #include <linux/rculist.h>
  #include <net/route.h>
  #include <net/xfrm.h>
  
  #include <net/icmp.h>
  #include <net/ip.h>
  #include <net/ip_tunnels.h>
  #include <net/gre.h>
  #include <net/net_namespace.h>
  #include <net/netns/generic.h>
  #include <net/protocol.h>
  
  #include "datapath.h"
  #include "vport.h"
  #include "vport-netdev.h"
  
  static struct vport_ops ovs_gre_vport_ops;
  
  static struct vport *gre_tnl_create(const struct vport_parms *parms)
  {
  	struct net *net = ovs_dp_get_net(parms->dp);
  	struct net_device *dev;
  	struct vport *vport;
  	int err;
  
  	vport = ovs_vport_alloc(0, &ovs_gre_vport_ops, parms);
  	if (IS_ERR(vport))
  		return vport;
  
  	rtnl_lock();
  	dev = gretap_fb_dev_create(net, parms->name, NET_NAME_USER);
  	if (IS_ERR(dev)) {
  		rtnl_unlock();
  		ovs_vport_free(vport);
  		return ERR_CAST(dev);
  	}
  
  	err = dev_change_flags(dev, dev->flags | IFF_UP);
  	if (err < 0) {
  		rtnl_delete_link(dev);
  		rtnl_unlock();
  		ovs_vport_free(vport);
  		return ERR_PTR(err);
  	}
  
  	rtnl_unlock();
  	return vport;
  }
  
  static struct vport *gre_create(const struct vport_parms *parms)
  {
  	struct vport *vport;
  
  	vport = gre_tnl_create(parms);
  	if (IS_ERR(vport))
  		return vport;
  
  	return ovs_netdev_link(vport, parms->name);
  }
  
  static struct vport_ops ovs_gre_vport_ops = {
  	.type		= OVS_VPORT_TYPE_GRE,
  	.create		= gre_create,
  	.send		= dev_queue_xmit,
  	.destroy	= ovs_netdev_tunnel_destroy,
  };
  
  static int __init ovs_gre_tnl_init(void)
  {
  	return ovs_vport_ops_register(&ovs_gre_vport_ops);
  }
  
  static void __exit ovs_gre_tnl_exit(void)
  {
  	ovs_vport_ops_unregister(&ovs_gre_vport_ops);
  }
  
  module_init(ovs_gre_tnl_init);
  module_exit(ovs_gre_tnl_exit);
  
  MODULE_DESCRIPTION("OVS: GRE switching port");
  MODULE_LICENSE("GPL");
  MODULE_ALIAS("vport-type-3");