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 #include <linux/hardirq.h> 20 #include <linux/if_vlan.h> 21 #include <linux/kernel.h> 22 #include <linux/netdevice.h> 23 #include <linux/etherdevice.h> 24 #include <linux/ethtool.h> 25 #include <linux/skbuff.h> 26 27 #include <net/dst.h> 28 #include <net/xfrm.h> 29 #include <net/rtnetlink.h> 30 31 #include "datapath.h" 32 #include "vport-internal_dev.h" 33 #include "vport-netdev.h" 34 35 struct internal_dev { 36 struct vport *vport; 37 }; 38 39 static struct vport_ops ovs_internal_vport_ops; 40 41 static struct internal_dev *internal_dev_priv(struct net_device *netdev) 42 { 43 return netdev_priv(netdev); 44 } 45 46 /* This function is only called by the kernel network layer.*/ 47 static struct rtnl_link_stats64 *internal_dev_get_stats(struct net_device *netdev, 48 struct rtnl_link_stats64 *stats) 49 { 50 struct vport *vport = ovs_internal_dev_get_vport(netdev); 51 struct ovs_vport_stats vport_stats; 52 53 ovs_vport_get_stats(vport, &vport_stats); 54 55 /* The tx and rx stats need to be swapped because the 56 * switch and host OS have opposite perspectives. */ 57 stats->rx_packets = vport_stats.tx_packets; 58 stats->tx_packets = vport_stats.rx_packets; 59 stats->rx_bytes = vport_stats.tx_bytes; 60 stats->tx_bytes = vport_stats.rx_bytes; 61 stats->rx_errors = vport_stats.tx_errors; 62 stats->tx_errors = vport_stats.rx_errors; 63 stats->rx_dropped = vport_stats.tx_dropped; 64 stats->tx_dropped = vport_stats.rx_dropped; 65 66 return stats; 67 } 68 69 /* Called with rcu_read_lock_bh. */ 70 static int internal_dev_xmit(struct sk_buff *skb, struct net_device *netdev) 71 { 72 rcu_read_lock(); 73 ovs_vport_receive(internal_dev_priv(netdev)->vport, skb, NULL); 74 rcu_read_unlock(); 75 return 0; 76 } 77 78 static int internal_dev_open(struct net_device *netdev) 79 { 80 netif_start_queue(netdev); 81 return 0; 82 } 83 84 static int internal_dev_stop(struct net_device *netdev) 85 { 86 netif_stop_queue(netdev); 87 return 0; 88 } 89 90 static void internal_dev_getinfo(struct net_device *netdev, 91 struct ethtool_drvinfo *info) 92 { 93 strlcpy(info->driver, "openvswitch", sizeof(info->driver)); 94 } 95 96 static const struct ethtool_ops internal_dev_ethtool_ops = { 97 .get_drvinfo = internal_dev_getinfo, 98 .get_link = ethtool_op_get_link, 99 }; 100 101 static int internal_dev_change_mtu(struct net_device *netdev, int new_mtu) 102 { 103 if (new_mtu < 68) 104 return -EINVAL; 105 106 netdev->mtu = new_mtu; 107 return 0; 108 } 109 110 static void internal_dev_destructor(struct net_device *dev) 111 { 112 struct vport *vport = ovs_internal_dev_get_vport(dev); 113 114 ovs_vport_free(vport); 115 free_netdev(dev); 116 } 117 118 static const struct net_device_ops internal_dev_netdev_ops = { 119 .ndo_open = internal_dev_open, 120 .ndo_stop = internal_dev_stop, 121 .ndo_start_xmit = internal_dev_xmit, 122 .ndo_set_mac_address = eth_mac_addr, 123 .ndo_change_mtu = internal_dev_change_mtu, 124 .ndo_get_stats64 = internal_dev_get_stats, 125 }; 126 127 static struct rtnl_link_ops internal_dev_link_ops __read_mostly = { 128 .kind = "openvswitch", 129 }; 130 131 static void do_setup(struct net_device *netdev) 132 { 133 ether_setup(netdev); 134 135 netdev->netdev_ops = &internal_dev_netdev_ops; 136 137 netdev->priv_flags &= ~IFF_TX_SKB_SHARING; 138 netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 139 netdev->destructor = internal_dev_destructor; 140 netdev->ethtool_ops = &internal_dev_ethtool_ops; 141 netdev->rtnl_link_ops = &internal_dev_link_ops; 142 netdev->tx_queue_len = 0; 143 144 netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST | 145 NETIF_F_HIGHDMA | NETIF_F_HW_CSUM | 146 NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL; 147 148 netdev->vlan_features = netdev->features; 149 netdev->hw_enc_features = netdev->features; 150 netdev->features |= NETIF_F_HW_VLAN_CTAG_TX; 151 netdev->hw_features = netdev->features & ~NETIF_F_LLTX; 152 153 eth_hw_addr_random(netdev); 154 } 155 156 static struct vport *internal_dev_create(const struct vport_parms *parms) 157 { 158 struct vport *vport; 159 struct internal_dev *internal_dev; 160 int err; 161 162 vport = ovs_vport_alloc(0, &ovs_internal_vport_ops, parms); 163 if (IS_ERR(vport)) { 164 err = PTR_ERR(vport); 165 goto error; 166 } 167 168 vport->dev = alloc_netdev(sizeof(struct internal_dev), 169 parms->name, NET_NAME_UNKNOWN, do_setup); 170 if (!vport->dev) { 171 err = -ENOMEM; 172 goto error_free_vport; 173 } 174 175 dev_net_set(vport->dev, ovs_dp_get_net(vport->dp)); 176 internal_dev = internal_dev_priv(vport->dev); 177 internal_dev->vport = vport; 178 179 /* Restrict bridge port to current netns. */ 180 if (vport->port_no == OVSP_LOCAL) 181 vport->dev->features |= NETIF_F_NETNS_LOCAL; 182 183 rtnl_lock(); 184 err = register_netdevice(vport->dev); 185 if (err) 186 goto error_free_netdev; 187 188 dev_set_promiscuity(vport->dev, 1); 189 rtnl_unlock(); 190 netif_start_queue(vport->dev); 191 192 return vport; 193 194 error_free_netdev: 195 rtnl_unlock(); 196 free_netdev(vport->dev); 197 error_free_vport: 198 ovs_vport_free(vport); 199 error: 200 return ERR_PTR(err); 201 } 202 203 static void internal_dev_destroy(struct vport *vport) 204 { 205 netif_stop_queue(vport->dev); 206 rtnl_lock(); 207 dev_set_promiscuity(vport->dev, -1); 208 209 /* unregister_netdevice() waits for an RCU grace period. */ 210 unregister_netdevice(vport->dev); 211 212 rtnl_unlock(); 213 } 214 215 static int internal_dev_recv(struct vport *vport, struct sk_buff *skb) 216 { 217 struct net_device *netdev = vport->dev; 218 int len; 219 220 if (unlikely(!(netdev->flags & IFF_UP))) { 221 kfree_skb(skb); 222 return 0; 223 } 224 225 len = skb->len; 226 227 skb_dst_drop(skb); 228 nf_reset(skb); 229 secpath_reset(skb); 230 231 skb->dev = netdev; 232 skb->pkt_type = PACKET_HOST; 233 skb->protocol = eth_type_trans(skb, netdev); 234 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); 235 236 netif_rx(skb); 237 238 return len; 239 } 240 241 static struct vport_ops ovs_internal_vport_ops = { 242 .type = OVS_VPORT_TYPE_INTERNAL, 243 .create = internal_dev_create, 244 .destroy = internal_dev_destroy, 245 .send = internal_dev_recv, 246 }; 247 248 int ovs_is_internal_dev(const struct net_device *netdev) 249 { 250 return netdev->netdev_ops == &internal_dev_netdev_ops; 251 } 252 253 struct vport *ovs_internal_dev_get_vport(struct net_device *netdev) 254 { 255 if (!ovs_is_internal_dev(netdev)) 256 return NULL; 257 258 return internal_dev_priv(netdev)->vport; 259 } 260 261 int ovs_internal_dev_rtnl_link_register(void) 262 { 263 int err; 264 265 err = rtnl_link_register(&internal_dev_link_ops); 266 if (err < 0) 267 return err; 268 269 err = ovs_vport_ops_register(&ovs_internal_vport_ops); 270 if (err < 0) 271 rtnl_link_unregister(&internal_dev_link_ops); 272 273 return err; 274 } 275 276 void ovs_internal_dev_rtnl_link_unregister(void) 277 { 278 ovs_vport_ops_unregister(&ovs_internal_vport_ops); 279 rtnl_link_unregister(&internal_dev_link_ops); 280 } 281