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 return local->dev; 88 } 89 90 struct vport *ovs_netdev_link(struct vport *vport, const char *name) 91 { 92 int err; 93 94 vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), name); 95 if (!vport->dev) { 96 err = -ENODEV; 97 goto error_free_vport; 98 } 99 100 if (vport->dev->flags & IFF_LOOPBACK || 101 (vport->dev->type != ARPHRD_ETHER && 102 vport->dev->type != ARPHRD_NONE) || 103 ovs_is_internal_dev(vport->dev)) { 104 err = -EINVAL; 105 goto error_put; 106 } 107 108 rtnl_lock(); 109 err = netdev_master_upper_dev_link(vport->dev, 110 get_dpdev(vport->dp), 111 NULL, NULL, NULL); 112 if (err) 113 goto error_unlock; 114 115 err = netdev_rx_handler_register(vport->dev, netdev_frame_hook, 116 vport); 117 if (err) 118 goto error_master_upper_dev_unlink; 119 120 dev_disable_lro(vport->dev); 121 dev_set_promiscuity(vport->dev, 1); 122 vport->dev->priv_flags |= IFF_OVS_DATAPATH; 123 rtnl_unlock(); 124 125 return vport; 126 127 error_master_upper_dev_unlink: 128 netdev_upper_dev_unlink(vport->dev, get_dpdev(vport->dp)); 129 error_unlock: 130 rtnl_unlock(); 131 error_put: 132 dev_put(vport->dev); 133 error_free_vport: 134 ovs_vport_free(vport); 135 return ERR_PTR(err); 136 } 137 EXPORT_SYMBOL_GPL(ovs_netdev_link); 138 139 static struct vport *netdev_create(const struct vport_parms *parms) 140 { 141 struct vport *vport; 142 143 vport = ovs_vport_alloc(0, &ovs_netdev_vport_ops, parms); 144 if (IS_ERR(vport)) 145 return vport; 146 147 return ovs_netdev_link(vport, parms->name); 148 } 149 150 static void vport_netdev_free(struct rcu_head *rcu) 151 { 152 struct vport *vport = container_of(rcu, struct vport, rcu); 153 154 if (vport->dev) 155 dev_put(vport->dev); 156 ovs_vport_free(vport); 157 } 158 159 void ovs_netdev_detach_dev(struct vport *vport) 160 { 161 ASSERT_RTNL(); 162 vport->dev->priv_flags &= ~IFF_OVS_DATAPATH; 163 netdev_rx_handler_unregister(vport->dev); 164 netdev_upper_dev_unlink(vport->dev, 165 netdev_master_upper_dev_get(vport->dev)); 166 dev_set_promiscuity(vport->dev, -1); 167 } 168 169 static void netdev_destroy(struct vport *vport) 170 { 171 rtnl_lock(); 172 if (vport->dev->priv_flags & IFF_OVS_DATAPATH) 173 ovs_netdev_detach_dev(vport); 174 rtnl_unlock(); 175 176 call_rcu(&vport->rcu, vport_netdev_free); 177 } 178 179 void ovs_netdev_tunnel_destroy(struct vport *vport) 180 { 181 rtnl_lock(); 182 if (vport->dev->priv_flags & IFF_OVS_DATAPATH) 183 ovs_netdev_detach_dev(vport); 184 185 /* We can be invoked by both explicit vport deletion and 186 * underlying netdev deregistration; delete the link only 187 * if it's not already shutting down. 188 */ 189 if (vport->dev->reg_state == NETREG_REGISTERED) 190 rtnl_delete_link(vport->dev); 191 dev_put(vport->dev); 192 vport->dev = NULL; 193 rtnl_unlock(); 194 195 call_rcu(&vport->rcu, vport_netdev_free); 196 } 197 EXPORT_SYMBOL_GPL(ovs_netdev_tunnel_destroy); 198 199 /* Returns null if this device is not attached to a datapath. */ 200 struct vport *ovs_netdev_get_vport(struct net_device *dev) 201 { 202 if (likely(dev->priv_flags & IFF_OVS_DATAPATH)) 203 return (struct vport *) 204 rcu_dereference_rtnl(dev->rx_handler_data); 205 else 206 return NULL; 207 } 208 209 static struct vport_ops ovs_netdev_vport_ops = { 210 .type = OVS_VPORT_TYPE_NETDEV, 211 .create = netdev_create, 212 .destroy = netdev_destroy, 213 .send = dev_queue_xmit, 214 }; 215 216 int __init ovs_netdev_init(void) 217 { 218 return ovs_vport_ops_register(&ovs_netdev_vport_ops); 219 } 220 221 void ovs_netdev_exit(void) 222 { 223 ovs_vport_ops_unregister(&ovs_netdev_vport_ops); 224 } 225