net/openvswitch/vport-gre.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Copyright (c) 2007-2014 Nicira, Inc.
0004  */
0005
0006 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
0007
0008 #include <linux/if.h>
0009 #include <linux/skbuff.h>
0010 #include <linux/ip.h>
0011 #include <linux/if_tunnel.h>
0012 #include <linux/if_vlan.h>
0013 #include <linux/in.h>
0014 #include <linux/in_route.h>
0015 #include <linux/inetdevice.h>
0016 #include <linux/jhash.h>
0017 #include <linux/list.h>
0018 #include <linux/kernel.h>
0019 #include <linux/module.h>
0020 #include <linux/workqueue.h>
0021 #include <linux/rculist.h>
0022 #include <net/route.h>
0023 #include <net/xfrm.h>
0024
0025 #include <net/icmp.h>
0026 #include <net/ip.h>
0027 #include <net/ip_tunnels.h>
0028 #include <net/gre.h>
0029 #include <net/net_namespace.h>
0030 #include <net/netns/generic.h>
0031 #include <net/protocol.h>
0032
0033 #include "datapath.h"
0034 #include "vport.h"
0035 #include "vport-netdev.h"
0036
0037 static struct vport_ops ovs_gre_vport_ops;
0038
0039 static struct vport *gre_tnl_create(const struct vport_parms *parms)
0040 {
0041     struct net *net = ovs_dp_get_net(parms->dp);
0042     struct net_device *dev;
0043     struct vport *vport;
0044     int err;
0045
0046     vport = ovs_vport_alloc(0, &ovs_gre_vport_ops, parms);
0047     if (IS_ERR(vport))
0048         return vport;
0049
0050     rtnl_lock();
0051     dev = gretap_fb_dev_create(net, parms->name, NET_NAME_USER);
0052     if (IS_ERR(dev)) {
0053         rtnl_unlock();
0054         ovs_vport_free(vport);
0055         return ERR_CAST(dev);
0056     }
0057
0058     err = dev_change_flags(dev, dev->flags | IFF_UP, NULL);
0059     if (err < 0) {
0060         rtnl_delete_link(dev);
0061         rtnl_unlock();
0062         ovs_vport_free(vport);
0063         return ERR_PTR(err);
0064     }
0065
0066     rtnl_unlock();
0067     return vport;
0068 }
0069
0070 static struct vport *gre_create(const struct vport_parms *parms)
0071 {
0072     struct vport *vport;
0073
0074     vport = gre_tnl_create(parms);
0075     if (IS_ERR(vport))
0076         return vport;
0077
0078     return ovs_netdev_link(vport, parms->name);
0079 }
0080
0081 static struct vport_ops ovs_gre_vport_ops = {
0082     .type       = OVS_VPORT_TYPE_GRE,
0083     .create     = gre_create,
0084     .send       = dev_queue_xmit,
0085     .destroy    = ovs_netdev_tunnel_destroy,
0086 };
0087
0088 static int __init ovs_gre_tnl_init(void)
0089 {
0090     return ovs_vport_ops_register(&ovs_gre_vport_ops);
0091 }
0092
0093 static void __exit ovs_gre_tnl_exit(void)
0094 {
0095     ovs_vport_ops_unregister(&ovs_gre_vport_ops);
0096 }
0097
0098 module_init(ovs_gre_tnl_init);
0099 module_exit(ovs_gre_tnl_exit);
0100
0101 MODULE_DESCRIPTION("OVS: GRE switching port");
0102 MODULE_LICENSE("GPL");
0103 MODULE_ALIAS("vport-type-3");