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