linux/net/openvswitch/vport-gre.c
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   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
  37static struct vport_ops ovs_gre_vport_ops;
  38
  39static 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);
  61                rtnl_unlock();
  62                ovs_vport_free(vport);
  63                return ERR_PTR(err);
  64        }
  65
  66        rtnl_unlock();
  67        return vport;
  68}
  69
  70static 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
  81static 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
  88static int __init ovs_gre_tnl_init(void)
  89{
  90        return ovs_vport_ops_register(&ovs_gre_vport_ops);
  91}
  92
  93static void __exit ovs_gre_tnl_exit(void)
  94{
  95        ovs_vport_ops_unregister(&ovs_gre_vport_ops);
  96}
  97
  98module_init(ovs_gre_tnl_init);
  99module_exit(ovs_gre_tnl_exit);
 100
 101MODULE_DESCRIPTION("OVS: GRE switching port");
 102MODULE_LICENSE("GPL");
 103MODULE_ALIAS("vport-type-3");
 104