1 /* 2 * drivers/net/veth.c 3 * 4 * Copyright (C) 2007 OpenVZ http://openvz.org, SWsoft Inc 5 * 6 * Author: Pavel Emelianov <xemul@openvz.org> 7 * Ethtool interface from: Eric W. Biederman <ebiederm@xmission.com> 8 * 9 */ 10 11 #include <linux/list.h> 12 #include <linux/netdevice.h> 13 #include <linux/ethtool.h> 14 #include <linux/etherdevice.h> 15 16 #include <net/dst.h> 17 #include <net/xfrm.h> 18 #include <linux/veth.h> 19 20 #define DRV_NAME "veth" 21 #define DRV_VERSION "1.0" 22 23 struct veth_net_stats { 24 unsigned long rx_packets; 25 unsigned long tx_packets; 26 unsigned long rx_bytes; 27 unsigned long tx_bytes; 28 unsigned long tx_dropped; 29 }; 30 31 struct veth_priv { 32 struct net_device *peer; 33 struct net_device *dev; 34 struct list_head list; 35 struct veth_net_stats *stats; 36 unsigned ip_summed; 37 }; 38 39 static LIST_HEAD(veth_list); 40 41 /* 42 * ethtool interface 43 */ 44 45 static struct { 46 const char string[ETH_GSTRING_LEN]; 47 } ethtool_stats_keys[] = { 48 { "peer_ifindex" }, 49 }; 50 51 static int veth_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) 52 { 53 cmd->supported = 0; 54 cmd->advertising = 0; 55 cmd->speed = SPEED_10000; 56 cmd->duplex = DUPLEX_FULL; 57 cmd->port = PORT_TP; 58 cmd->phy_address = 0; 59 cmd->transceiver = XCVR_INTERNAL; 60 cmd->autoneg = AUTONEG_DISABLE; 61 cmd->maxtxpkt = 0; 62 cmd->maxrxpkt = 0; 63 return 0; 64 } 65 66 static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) 67 { 68 strcpy(info->driver, DRV_NAME); 69 strcpy(info->version, DRV_VERSION); 70 strcpy(info->fw_version, "N/A"); 71 } 72 73 static void veth_get_strings(struct net_device *dev, u32 stringset, u8 *buf) 74 { 75 switch(stringset) { 76 case ETH_SS_STATS: 77 memcpy(buf, ðtool_stats_keys, sizeof(ethtool_stats_keys)); 78 break; 79 } 80 } 81 82 static int veth_get_sset_count(struct net_device *dev, int sset) 83 { 84 switch (sset) { 85 case ETH_SS_STATS: 86 return ARRAY_SIZE(ethtool_stats_keys); 87 default: 88 return -EOPNOTSUPP; 89 } 90 } 91 92 static void veth_get_ethtool_stats(struct net_device *dev, 93 struct ethtool_stats *stats, u64 *data) 94 { 95 struct veth_priv *priv; 96 97 priv = netdev_priv(dev); 98 data[0] = priv->peer->ifindex; 99 } 100 101 static u32 veth_get_rx_csum(struct net_device *dev) 102 { 103 struct veth_priv *priv; 104 105 priv = netdev_priv(dev); 106 return priv->ip_summed == CHECKSUM_UNNECESSARY; 107 } 108 109 static int veth_set_rx_csum(struct net_device *dev, u32 data) 110 { 111 struct veth_priv *priv; 112 113 priv = netdev_priv(dev); 114 priv->ip_summed = data ? CHECKSUM_UNNECESSARY : CHECKSUM_NONE; 115 return 0; 116 } 117 118 static u32 veth_get_tx_csum(struct net_device *dev) 119 { 120 return (dev->features & NETIF_F_NO_CSUM) != 0; 121 } 122 123 static int veth_set_tx_csum(struct net_device *dev, u32 data) 124 { 125 if (data) 126 dev->features |= NETIF_F_NO_CSUM; 127 else 128 dev->features &= ~NETIF_F_NO_CSUM; 129 return 0; 130 } 131 132 static struct ethtool_ops veth_ethtool_ops = { 133 .get_settings = veth_get_settings, 134 .get_drvinfo = veth_get_drvinfo, 135 .get_link = ethtool_op_get_link, 136 .get_rx_csum = veth_get_rx_csum, 137 .set_rx_csum = veth_set_rx_csum, 138 .get_tx_csum = veth_get_tx_csum, 139 .set_tx_csum = veth_set_tx_csum, 140 .get_sg = ethtool_op_get_sg, 141 .set_sg = ethtool_op_set_sg, 142 .get_strings = veth_get_strings, 143 .get_sset_count = veth_get_sset_count, 144 .get_ethtool_stats = veth_get_ethtool_stats, 145 }; 146 147 /* 148 * xmit 149 */ 150 151 static int veth_xmit(struct sk_buff *skb, struct net_device *dev) 152 { 153 struct net_device *rcv = NULL; 154 struct veth_priv *priv, *rcv_priv; 155 struct veth_net_stats *stats; 156 int length, cpu; 157 158 skb_orphan(skb); 159 160 priv = netdev_priv(dev); 161 rcv = priv->peer; 162 rcv_priv = netdev_priv(rcv); 163 164 cpu = smp_processor_id(); 165 stats = per_cpu_ptr(priv->stats, cpu); 166 167 if (!(rcv->flags & IFF_UP)) 168 goto outf; 169 170 skb->pkt_type = PACKET_HOST; 171 skb->protocol = eth_type_trans(skb, rcv); 172 if (dev->features & NETIF_F_NO_CSUM) 173 skb->ip_summed = rcv_priv->ip_summed; 174 175 dst_release(skb->dst); 176 skb->dst = NULL; 177 skb->mark = 0; 178 secpath_reset(skb); 179 nf_reset(skb); 180 181 length = skb->len; 182 183 stats->tx_bytes += length; 184 stats->tx_packets++; 185 186 stats = per_cpu_ptr(rcv_priv->stats, cpu); 187 stats->rx_bytes += length; 188 stats->rx_packets++; 189 190 netif_rx(skb); 191 return 0; 192 193 outf: 194 kfree_skb(skb); 195 stats->tx_dropped++; 196 return 0; 197 } 198 199 /* 200 * general routines 201 */ 202 203 static struct net_device_stats *veth_get_stats(struct net_device *dev) 204 { 205 struct veth_priv *priv; 206 struct net_device_stats *dev_stats; 207 int cpu; 208 struct veth_net_stats *stats; 209 210 priv = netdev_priv(dev); 211 dev_stats = &dev->stats; 212 213 dev_stats->rx_packets = 0; 214 dev_stats->tx_packets = 0; 215 dev_stats->rx_bytes = 0; 216 dev_stats->tx_bytes = 0; 217 dev_stats->tx_dropped = 0; 218 219 for_each_online_cpu(cpu) { 220 stats = per_cpu_ptr(priv->stats, cpu); 221 222 dev_stats->rx_packets += stats->rx_packets; 223 dev_stats->tx_packets += stats->tx_packets; 224 dev_stats->rx_bytes += stats->rx_bytes; 225 dev_stats->tx_bytes += stats->tx_bytes; 226 dev_stats->tx_dropped += stats->tx_dropped; 227 } 228 229 return dev_stats; 230 } 231 232 static int veth_open(struct net_device *dev) 233 { 234 struct veth_priv *priv; 235 236 priv = netdev_priv(dev); 237 if (priv->peer == NULL) 238 return -ENOTCONN; 239 240 if (priv->peer->flags & IFF_UP) { 241 netif_carrier_on(dev); 242 netif_carrier_on(priv->peer); 243 } 244 return 0; 245 } 246 247 static int veth_dev_init(struct net_device *dev) 248 { 249 struct veth_net_stats *stats; 250 struct veth_priv *priv; 251 252 stats = alloc_percpu(struct veth_net_stats); 253 if (stats == NULL) 254 return -ENOMEM; 255 256 priv = netdev_priv(dev); 257 priv->stats = stats; 258 return 0; 259 } 260 261 static void veth_dev_free(struct net_device *dev) 262 { 263 struct veth_priv *priv; 264 265 priv = netdev_priv(dev); 266 free_percpu(priv->stats); 267 free_netdev(dev); 268 } 269 270 static void veth_setup(struct net_device *dev) 271 { 272 ether_setup(dev); 273 274 dev->hard_start_xmit = veth_xmit; 275 dev->get_stats = veth_get_stats; 276 dev->open = veth_open; 277 dev->ethtool_ops = &veth_ethtool_ops; 278 dev->features |= NETIF_F_LLTX; 279 dev->init = veth_dev_init; 280 dev->destructor = veth_dev_free; 281 } 282 283 static void veth_change_state(struct net_device *dev) 284 { 285 struct net_device *peer; 286 struct veth_priv *priv; 287 288 priv = netdev_priv(dev); 289 peer = priv->peer; 290 291 if (netif_carrier_ok(peer)) { 292 if (!netif_carrier_ok(dev)) 293 netif_carrier_on(dev); 294 } else { 295 if (netif_carrier_ok(dev)) 296 netif_carrier_off(dev); 297 } 298 } 299 300 static int veth_device_event(struct notifier_block *unused, 301 unsigned long event, void *ptr) 302 { 303 struct net_device *dev = ptr; 304 305 if (dev->open != veth_open) 306 goto out; 307 308 switch (event) { 309 case NETDEV_CHANGE: 310 veth_change_state(dev); 311 break; 312 } 313 out: 314 return NOTIFY_DONE; 315 } 316 317 static struct notifier_block veth_notifier_block __read_mostly = { 318 .notifier_call = veth_device_event, 319 }; 320 321 /* 322 * netlink interface 323 */ 324 325 static int veth_validate(struct nlattr *tb[], struct nlattr *data[]) 326 { 327 if (tb[IFLA_ADDRESS]) { 328 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 329 return -EINVAL; 330 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 331 return -EADDRNOTAVAIL; 332 } 333 return 0; 334 } 335 336 static struct rtnl_link_ops veth_link_ops; 337 338 static int veth_newlink(struct net_device *dev, 339 struct nlattr *tb[], struct nlattr *data[]) 340 { 341 int err; 342 struct net_device *peer; 343 struct veth_priv *priv; 344 char ifname[IFNAMSIZ]; 345 struct nlattr *peer_tb[IFLA_MAX + 1], **tbp; 346 347 /* 348 * create and register peer first 349 * 350 * struct ifinfomsg is at the head of VETH_INFO_PEER, but we 351 * skip it since no info from it is useful yet 352 */ 353 354 if (data != NULL && data[VETH_INFO_PEER] != NULL) { 355 struct nlattr *nla_peer; 356 357 nla_peer = data[VETH_INFO_PEER]; 358 err = nla_parse(peer_tb, IFLA_MAX, 359 nla_data(nla_peer) + sizeof(struct ifinfomsg), 360 nla_len(nla_peer) - sizeof(struct ifinfomsg), 361 ifla_policy); 362 if (err < 0) 363 return err; 364 365 err = veth_validate(peer_tb, NULL); 366 if (err < 0) 367 return err; 368 369 tbp = peer_tb; 370 } else 371 tbp = tb; 372 373 if (tbp[IFLA_IFNAME]) 374 nla_strlcpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ); 375 else 376 snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d"); 377 378 peer = rtnl_create_link(dev_net(dev), ifname, &veth_link_ops, tbp); 379 if (IS_ERR(peer)) 380 return PTR_ERR(peer); 381 382 if (tbp[IFLA_ADDRESS] == NULL) 383 random_ether_addr(peer->dev_addr); 384 385 err = register_netdevice(peer); 386 if (err < 0) 387 goto err_register_peer; 388 389 netif_carrier_off(peer); 390 391 /* 392 * register dev last 393 * 394 * note, that since we've registered new device the dev's name 395 * should be re-allocated 396 */ 397 398 if (tb[IFLA_ADDRESS] == NULL) 399 random_ether_addr(dev->dev_addr); 400 401 if (tb[IFLA_IFNAME]) 402 nla_strlcpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ); 403 else 404 snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d"); 405 406 if (strchr(dev->name, '%')) { 407 err = dev_alloc_name(dev, dev->name); 408 if (err < 0) 409 goto err_alloc_name; 410 } 411 412 err = register_netdevice(dev); 413 if (err < 0) 414 goto err_register_dev; 415 416 netif_carrier_off(dev); 417 418 /* 419 * tie the deviced together 420 */ 421 422 priv = netdev_priv(dev); 423 priv->dev = dev; 424 priv->peer = peer; 425 list_add(&priv->list, &veth_list); 426 427 priv = netdev_priv(peer); 428 priv->dev = peer; 429 priv->peer = dev; 430 INIT_LIST_HEAD(&priv->list); 431 return 0; 432 433 err_register_dev: 434 /* nothing to do */ 435 err_alloc_name: 436 unregister_netdevice(peer); 437 return err; 438 439 err_register_peer: 440 free_netdev(peer); 441 return err; 442 } 443 444 static void veth_dellink(struct net_device *dev) 445 { 446 struct veth_priv *priv; 447 struct net_device *peer; 448 449 priv = netdev_priv(dev); 450 peer = priv->peer; 451 452 if (!list_empty(&priv->list)) 453 list_del(&priv->list); 454 455 priv = netdev_priv(peer); 456 if (!list_empty(&priv->list)) 457 list_del(&priv->list); 458 459 unregister_netdevice(dev); 460 unregister_netdevice(peer); 461 } 462 463 static const struct nla_policy veth_policy[VETH_INFO_MAX + 1]; 464 465 static struct rtnl_link_ops veth_link_ops = { 466 .kind = DRV_NAME, 467 .priv_size = sizeof(struct veth_priv), 468 .setup = veth_setup, 469 .validate = veth_validate, 470 .newlink = veth_newlink, 471 .dellink = veth_dellink, 472 .policy = veth_policy, 473 .maxtype = VETH_INFO_MAX, 474 }; 475 476 /* 477 * init/fini 478 */ 479 480 static __init int veth_init(void) 481 { 482 register_netdevice_notifier(&veth_notifier_block); 483 return rtnl_link_register(&veth_link_ops); 484 } 485 486 static __exit void veth_exit(void) 487 { 488 rtnl_link_unregister(&veth_link_ops); 489 unregister_netdevice_notifier(&veth_notifier_block); 490 } 491 492 module_init(veth_init); 493 module_exit(veth_exit); 494 495 MODULE_DESCRIPTION("Virtual Ethernet Tunnel"); 496 MODULE_LICENSE("GPL v2"); 497 MODULE_ALIAS_RTNL_LINK(DRV_NAME); 498