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"); 117