1 /* 2 * Copyright (c) 2007-2012 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_arp.h> 22 #include <linux/if_bridge.h> 23 #include <linux/if_vlan.h> 24 #include <linux/kernel.h> 25 #include <linux/llc.h> 26 #include <linux/rtnetlink.h> 27 #include <linux/skbuff.h> 28 #include <linux/openvswitch.h> 29 #include <linux/export.h> 30 31 #include <net/ip_tunnels.h> 32 #include <net/rtnetlink.h> 33 34 #include "datapath.h" 35 #include "vport.h" 36 #include "vport-internal_dev.h" 37 #include "vport-netdev.h" 38 39 static struct vport_ops ovs_netdev_vport_ops; 40 41 /* Must be called with rcu_read_lock. */ 42 static void netdev_port_receive(struct sk_buff *skb) 43 { 44 struct vport *vport; 45 46 vport = ovs_netdev_get_vport(skb->dev); 47 if (unlikely(!vport)) 48 goto error; 49 50 if (unlikely(skb_warn_if_lro(skb))) 51 goto error; 52 53 /* Make our own copy of the packet. Otherwise we will mangle the 54 * packet for anyone who came before us (e.g. tcpdump via AF_PACKET). 55 */ 56 skb = skb_share_check(skb, GFP_ATOMIC); 57 if (unlikely(!skb)) 58 return; 59 60 if (skb->dev->type == ARPHRD_ETHER) { 61 skb_push(skb, ETH_HLEN); 62 skb_postpush_rcsum(skb, skb->data, ETH_HLEN); 63 } 64 ovs_vport_receive(vport, skb, skb_tunnel_info(skb)); 65 return; 66 error: 67 kfree_skb(skb); 68 } 69 70 /* Called with rcu_read_lock and bottom-halves disabled. */ 71 static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb) 72 { 73 struct sk_buff *skb = *pskb; 74 75 if (unlikely(skb->pkt_type == PACKET_LOOPBACK)) 76 return RX_HANDLER_PASS; 77 78 netdev_port_receive(skb); 79 return RX_HANDLER_CONSUMED; 80 } 81 82 static struct net_device *get_dpdev(const struct datapath *dp) 83 { 84 struct vport *local; 85 86 local = ovs_vport_ovsl(dp, OVSP_LOCAL); 87 BUG_ON(!local); 88 return local->dev; 89 } 90 91 struct vport *ovs_netdev_link(struct vport *vport, const char *name) 92 { 93 int err; 94 95 vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), name); 96 if (!vport->dev) { 97 err = -ENODEV; 98 goto error_free_vport; 99 } 100 101 if (vport->dev->flags & IFF_LOOPBACK || 102 (vport->dev->type != ARPHRD_ETHER && 103 vport->dev->type != ARPHRD_NONE) || 104 ovs_is_internal_dev(vport->dev)) { 105 err = -EINVAL; 106 goto error_put; 107 } 108 109 rtnl_lock(); 110 err = netdev_master_upper_dev_link(vport->dev, 111 get_dpdev(vport->dp), 112 NULL, NULL, NULL); 113 if (err) 114 goto error_unlock; 115 116 err = netdev_rx_handler_register(vport->dev, netdev_frame_hook, 117 vport); 118 if (err) 119 goto error_master_upper_dev_unlink; 120 121 dev_disable_lro(vport->dev); 122 dev_set_promiscuity(vport->dev, 1); 123 vport->dev->priv_flags |= IFF_OVS_DATAPATH; 124 rtnl_unlock(); 125 126 return vport; 127 128 error_master_upper_dev_unlink: 129 netdev_upper_dev_unlink(vport->dev, get_dpdev(vport->dp)); 130 error_unlock: 131 rtnl_unlock(); 132 error_put: 133 dev_put(vport->dev); 134 error_free_vport: 135 ovs_vport_free(vport); 136 return ERR_PTR(err); 137 } 138 EXPORT_SYMBOL_GPL(ovs_netdev_link); 139 140 static struct vport *netdev_create(const struct vport_parms *parms) 141 { 142 struct vport *vport; 143 144 vport = ovs_vport_alloc(0, &ovs_netdev_vport_ops, parms); 145 if (IS_ERR(vport)) 146 return vport; 147 148 return ovs_netdev_link(vport, parms->name); 149 } 150 151 static void vport_netdev_free(struct rcu_head *rcu) 152 { 153 struct vport *vport = container_of(rcu, struct vport, rcu); 154 155 if (vport->dev) 156 dev_put(vport->dev); 157 ovs_vport_free(vport); 158 } 159 160 void ovs_netdev_detach_dev(struct vport *vport) 161 { 162 ASSERT_RTNL(); 163 vport->dev->priv_flags &= ~IFF_OVS_DATAPATH; 164 netdev_rx_handler_unregister(vport->dev); 165 netdev_upper_dev_unlink(vport->dev, 166 netdev_master_upper_dev_get(vport->dev)); 167 dev_set_promiscuity(vport->dev, -1); 168 } 169 170 static void netdev_destroy(struct vport *vport) 171 { 172 rtnl_lock(); 173 if (vport->dev->priv_flags & IFF_OVS_DATAPATH) 174 ovs_netdev_detach_dev(vport); 175 rtnl_unlock(); 176 177 call_rcu(&vport->rcu, vport_netdev_free); 178 } 179 180 void ovs_netdev_tunnel_destroy(struct vport *vport) 181 { 182 rtnl_lock(); 183 if (vport->dev->priv_flags & IFF_OVS_DATAPATH) 184 ovs_netdev_detach_dev(vport); 185 186 /* We can be invoked by both explicit vport deletion and 187 * underlying netdev deregistration; delete the link only 188 * if it's not already shutting down. 189 */ 190 if (vport->dev->reg_state == NETREG_REGISTERED) 191 rtnl_delete_link(vport->dev); 192 dev_put(vport->dev); 193 vport->dev = NULL; 194 rtnl_unlock(); 195 196 call_rcu(&vport->rcu, vport_netdev_free); 197 } 198 EXPORT_SYMBOL_GPL(ovs_netdev_tunnel_destroy); 199 200 /* Returns null if this device is not attached to a datapath. */ 201 struct vport *ovs_netdev_get_vport(struct net_device *dev) 202 { 203 if (likely(dev->priv_flags & IFF_OVS_DATAPATH)) 204 return (struct vport *) 205 rcu_dereference_rtnl(dev->rx_handler_data); 206 else 207 return NULL; 208 } 209 210 static struct vport_ops ovs_netdev_vport_ops = { 211 .type = OVS_VPORT_TYPE_NETDEV, 212 .create = netdev_create, 213 .destroy = netdev_destroy, 214 .send = dev_queue_xmit, 215 }; 216 217 int __init ovs_netdev_init(void) 218 { 219 return ovs_vport_ops_register(&ovs_netdev_vport_ops); 220 } 221 222 void ovs_netdev_exit(void) 223 { 224 ovs_vport_ops_unregister(&ovs_netdev_vport_ops); 225 } 226