1 /* 2 * Copyright (c) 2007 Patrick McHardy <kaber@trash.net> 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License as 6 * published by the Free Software Foundation; either version 2 of 7 * the License, or (at your option) any later version. 8 * 9 * The code this is based on carried the following copyright notice: 10 * --- 11 * (C) Copyright 2001-2006 12 * Alex Zeffertt, Cambridge Broadband Ltd, ajz@cambridgebroadband.com 13 * Re-worked by Ben Greear <greearb@candelatech.com> 14 * --- 15 */ 16 #include <linux/kernel.h> 17 #include <linux/types.h> 18 #include <linux/module.h> 19 #include <linux/init.h> 20 #include <linux/errno.h> 21 #include <linux/slab.h> 22 #include <linux/string.h> 23 #include <linux/rculist.h> 24 #include <linux/notifier.h> 25 #include <linux/netdevice.h> 26 #include <linux/etherdevice.h> 27 #include <linux/ethtool.h> 28 #include <linux/if_arp.h> 29 #include <linux/if_link.h> 30 #include <linux/if_macvlan.h> 31 #include <net/rtnetlink.h> 32 33 #define MACVLAN_HASH_SIZE (1 << BITS_PER_BYTE) 34 35 struct macvlan_port { 36 struct net_device *dev; 37 struct hlist_head vlan_hash[MACVLAN_HASH_SIZE]; 38 struct list_head vlans; 39 }; 40 41 struct macvlan_dev { 42 struct net_device *dev; 43 struct list_head list; 44 struct hlist_node hlist; 45 struct macvlan_port *port; 46 struct net_device *lowerdev; 47 }; 48 49 50 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port, 51 const unsigned char *addr) 52 { 53 struct macvlan_dev *vlan; 54 struct hlist_node *n; 55 56 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[addr[5]], hlist) { 57 if (!compare_ether_addr(vlan->dev->dev_addr, addr)) 58 return vlan; 59 } 60 return NULL; 61 } 62 63 static void macvlan_broadcast(struct sk_buff *skb, 64 const struct macvlan_port *port) 65 { 66 const struct ethhdr *eth = eth_hdr(skb); 67 const struct macvlan_dev *vlan; 68 struct hlist_node *n; 69 struct net_device *dev; 70 struct sk_buff *nskb; 71 unsigned int i; 72 73 if (skb->protocol == htons(ETH_P_PAUSE)) 74 return; 75 76 for (i = 0; i < MACVLAN_HASH_SIZE; i++) { 77 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[i], hlist) { 78 dev = vlan->dev; 79 80 nskb = skb_clone(skb, GFP_ATOMIC); 81 if (nskb == NULL) { 82 dev->stats.rx_errors++; 83 dev->stats.rx_dropped++; 84 continue; 85 } 86 87 dev->stats.rx_bytes += skb->len + ETH_HLEN; 88 dev->stats.rx_packets++; 89 dev->stats.multicast++; 90 91 nskb->dev = dev; 92 if (!compare_ether_addr(eth->h_dest, dev->broadcast)) 93 nskb->pkt_type = PACKET_BROADCAST; 94 else 95 nskb->pkt_type = PACKET_MULTICAST; 96 97 netif_rx(nskb); 98 } 99 } 100 } 101 102 /* called under rcu_read_lock() from netif_receive_skb */ 103 static struct sk_buff *macvlan_handle_frame(struct sk_buff *skb) 104 { 105 const struct ethhdr *eth = eth_hdr(skb); 106 const struct macvlan_port *port; 107 const struct macvlan_dev *vlan; 108 struct net_device *dev; 109 110 port = rcu_dereference(skb->dev->macvlan_port); 111 if (port == NULL) 112 return skb; 113 114 if (is_multicast_ether_addr(eth->h_dest)) { 115 macvlan_broadcast(skb, port); 116 return skb; 117 } 118 119 vlan = macvlan_hash_lookup(port, eth->h_dest); 120 if (vlan == NULL) 121 return skb; 122 123 dev = vlan->dev; 124 if (unlikely(!(dev->flags & IFF_UP))) { 125 kfree_skb(skb); 126 return NULL; 127 } 128 129 skb = skb_share_check(skb, GFP_ATOMIC); 130 if (skb == NULL) { 131 dev->stats.rx_errors++; 132 dev->stats.rx_dropped++; 133 return NULL; 134 } 135 136 dev->stats.rx_bytes += skb->len + ETH_HLEN; 137 dev->stats.rx_packets++; 138 139 skb->dev = dev; 140 skb->pkt_type = PACKET_HOST; 141 142 netif_rx(skb); 143 return NULL; 144 } 145 146 static int macvlan_start_xmit(struct sk_buff *skb, struct net_device *dev) 147 { 148 const struct macvlan_dev *vlan = netdev_priv(dev); 149 unsigned int len = skb->len; 150 int ret; 151 152 skb->dev = vlan->lowerdev; 153 ret = dev_queue_xmit(skb); 154 155 if (likely(ret == NET_XMIT_SUCCESS)) { 156 dev->stats.tx_packets++; 157 dev->stats.tx_bytes += len; 158 } else { 159 dev->stats.tx_errors++; 160 dev->stats.tx_aborted_errors++; 161 } 162 return NETDEV_TX_OK; 163 } 164 165 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 166 unsigned short type, const void *daddr, 167 const void *saddr, unsigned len) 168 { 169 const struct macvlan_dev *vlan = netdev_priv(dev); 170 struct net_device *lowerdev = vlan->lowerdev; 171 172 return dev_hard_header(skb, lowerdev, type, daddr, 173 saddr ? : dev->dev_addr, len); 174 } 175 176 static const struct header_ops macvlan_hard_header_ops = { 177 .create = macvlan_hard_header, 178 .rebuild = eth_rebuild_header, 179 .parse = eth_header_parse, 180 .cache = eth_header_cache, 181 .cache_update = eth_header_cache_update, 182 }; 183 184 static int macvlan_open(struct net_device *dev) 185 { 186 struct macvlan_dev *vlan = netdev_priv(dev); 187 struct macvlan_port *port = vlan->port; 188 struct net_device *lowerdev = vlan->lowerdev; 189 int err; 190 191 err = dev_unicast_add(lowerdev, dev->dev_addr, ETH_ALEN); 192 if (err < 0) 193 goto out; 194 if (dev->flags & IFF_ALLMULTI) { 195 err = dev_set_allmulti(lowerdev, 1); 196 if (err < 0) 197 goto del_unicast; 198 } 199 200 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[dev->dev_addr[5]]); 201 return 0; 202 203 del_unicast: 204 dev_unicast_delete(lowerdev, dev->dev_addr, ETH_ALEN); 205 out: 206 return err; 207 } 208 209 static int macvlan_stop(struct net_device *dev) 210 { 211 struct macvlan_dev *vlan = netdev_priv(dev); 212 struct net_device *lowerdev = vlan->lowerdev; 213 214 dev_mc_unsync(lowerdev, dev); 215 if (dev->flags & IFF_ALLMULTI) 216 dev_set_allmulti(lowerdev, -1); 217 218 dev_unicast_delete(lowerdev, dev->dev_addr, ETH_ALEN); 219 220 hlist_del_rcu(&vlan->hlist); 221 synchronize_rcu(); 222 return 0; 223 } 224 225 static int macvlan_set_mac_address(struct net_device *dev, void *p) 226 { 227 struct macvlan_dev *vlan = netdev_priv(dev); 228 struct net_device *lowerdev = vlan->lowerdev; 229 struct sockaddr *addr = p; 230 int err; 231 232 if (!is_valid_ether_addr(addr->sa_data)) 233 return -EADDRNOTAVAIL; 234 235 if (!(dev->flags & IFF_UP)) 236 goto out; 237 238 err = dev_unicast_add(lowerdev, addr->sa_data, ETH_ALEN); 239 if (err < 0) 240 return err; 241 dev_unicast_delete(lowerdev, dev->dev_addr, ETH_ALEN); 242 243 out: 244 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); 245 return 0; 246 } 247 248 static void macvlan_change_rx_flags(struct net_device *dev, int change) 249 { 250 struct macvlan_dev *vlan = netdev_priv(dev); 251 struct net_device *lowerdev = vlan->lowerdev; 252 253 if (change & IFF_ALLMULTI) 254 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1); 255 } 256 257 static void macvlan_set_multicast_list(struct net_device *dev) 258 { 259 struct macvlan_dev *vlan = netdev_priv(dev); 260 261 dev_mc_sync(vlan->lowerdev, dev); 262 } 263 264 static int macvlan_change_mtu(struct net_device *dev, int new_mtu) 265 { 266 struct macvlan_dev *vlan = netdev_priv(dev); 267 268 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu) 269 return -EINVAL; 270 dev->mtu = new_mtu; 271 return 0; 272 } 273 274 /* 275 * macvlan network devices have devices nesting below it and are a special 276 * "super class" of normal network devices; split their locks off into a 277 * separate class since they always nest. 278 */ 279 static struct lock_class_key macvlan_netdev_xmit_lock_key; 280 static struct lock_class_key macvlan_netdev_addr_lock_key; 281 282 #define MACVLAN_FEATURES \ 283 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 284 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \ 285 NETIF_F_TSO_ECN | NETIF_F_TSO6) 286 287 #define MACVLAN_STATE_MASK \ 288 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 289 290 static void macvlan_set_lockdep_class_one(struct net_device *dev, 291 struct netdev_queue *txq, 292 void *_unused) 293 { 294 lockdep_set_class(&txq->_xmit_lock, 295 &macvlan_netdev_xmit_lock_key); 296 } 297 298 static void macvlan_set_lockdep_class(struct net_device *dev) 299 { 300 lockdep_set_class(&dev->addr_list_lock, 301 &macvlan_netdev_addr_lock_key); 302 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL); 303 } 304 305 static int macvlan_init(struct net_device *dev) 306 { 307 struct macvlan_dev *vlan = netdev_priv(dev); 308 const struct net_device *lowerdev = vlan->lowerdev; 309 310 dev->state = (dev->state & ~MACVLAN_STATE_MASK) | 311 (lowerdev->state & MACVLAN_STATE_MASK); 312 dev->features = lowerdev->features & MACVLAN_FEATURES; 313 dev->iflink = lowerdev->ifindex; 314 315 macvlan_set_lockdep_class(dev); 316 317 return 0; 318 } 319 320 static void macvlan_ethtool_get_drvinfo(struct net_device *dev, 321 struct ethtool_drvinfo *drvinfo) 322 { 323 snprintf(drvinfo->driver, 32, "macvlan"); 324 snprintf(drvinfo->version, 32, "0.1"); 325 } 326 327 static u32 macvlan_ethtool_get_rx_csum(struct net_device *dev) 328 { 329 const struct macvlan_dev *vlan = netdev_priv(dev); 330 struct net_device *lowerdev = vlan->lowerdev; 331 332 if (lowerdev->ethtool_ops->get_rx_csum == NULL) 333 return 0; 334 return lowerdev->ethtool_ops->get_rx_csum(lowerdev); 335 } 336 337 static int macvlan_ethtool_get_settings(struct net_device *dev, 338 struct ethtool_cmd *cmd) 339 { 340 const struct macvlan_dev *vlan = netdev_priv(dev); 341 struct net_device *lowerdev = vlan->lowerdev; 342 343 if (!lowerdev->ethtool_ops->get_settings) 344 return -EOPNOTSUPP; 345 346 return lowerdev->ethtool_ops->get_settings(lowerdev, cmd); 347 } 348 349 static u32 macvlan_ethtool_get_flags(struct net_device *dev) 350 { 351 const struct macvlan_dev *vlan = netdev_priv(dev); 352 struct net_device *lowerdev = vlan->lowerdev; 353 354 if (!lowerdev->ethtool_ops->get_flags) 355 return 0; 356 return lowerdev->ethtool_ops->get_flags(lowerdev); 357 } 358 359 static const struct ethtool_ops macvlan_ethtool_ops = { 360 .get_link = ethtool_op_get_link, 361 .get_settings = macvlan_ethtool_get_settings, 362 .get_rx_csum = macvlan_ethtool_get_rx_csum, 363 .get_drvinfo = macvlan_ethtool_get_drvinfo, 364 .get_flags = macvlan_ethtool_get_flags, 365 }; 366 367 static const struct net_device_ops macvlan_netdev_ops = { 368 .ndo_init = macvlan_init, 369 .ndo_open = macvlan_open, 370 .ndo_stop = macvlan_stop, 371 .ndo_start_xmit = macvlan_start_xmit, 372 .ndo_change_mtu = macvlan_change_mtu, 373 .ndo_change_rx_flags = macvlan_change_rx_flags, 374 .ndo_set_mac_address = macvlan_set_mac_address, 375 .ndo_set_multicast_list = macvlan_set_multicast_list, 376 .ndo_validate_addr = eth_validate_addr, 377 }; 378 379 static void macvlan_setup(struct net_device *dev) 380 { 381 ether_setup(dev); 382 383 dev->netdev_ops = &macvlan_netdev_ops; 384 dev->destructor = free_netdev; 385 dev->header_ops = &macvlan_hard_header_ops, 386 dev->ethtool_ops = &macvlan_ethtool_ops; 387 dev->tx_queue_len = 0; 388 } 389 390 static int macvlan_port_create(struct net_device *dev) 391 { 392 struct macvlan_port *port; 393 unsigned int i; 394 395 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) 396 return -EINVAL; 397 398 port = kzalloc(sizeof(*port), GFP_KERNEL); 399 if (port == NULL) 400 return -ENOMEM; 401 402 port->dev = dev; 403 INIT_LIST_HEAD(&port->vlans); 404 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 405 INIT_HLIST_HEAD(&port->vlan_hash[i]); 406 rcu_assign_pointer(dev->macvlan_port, port); 407 return 0; 408 } 409 410 static void macvlan_port_destroy(struct net_device *dev) 411 { 412 struct macvlan_port *port = dev->macvlan_port; 413 414 rcu_assign_pointer(dev->macvlan_port, NULL); 415 synchronize_rcu(); 416 kfree(port); 417 } 418 419 static void macvlan_transfer_operstate(struct net_device *dev) 420 { 421 struct macvlan_dev *vlan = netdev_priv(dev); 422 const struct net_device *lowerdev = vlan->lowerdev; 423 424 if (lowerdev->operstate == IF_OPER_DORMANT) 425 netif_dormant_on(dev); 426 else 427 netif_dormant_off(dev); 428 429 if (netif_carrier_ok(lowerdev)) { 430 if (!netif_carrier_ok(dev)) 431 netif_carrier_on(dev); 432 } else { 433 if (netif_carrier_ok(dev)) 434 netif_carrier_off(dev); 435 } 436 } 437 438 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[]) 439 { 440 if (tb[IFLA_ADDRESS]) { 441 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 442 return -EINVAL; 443 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 444 return -EADDRNOTAVAIL; 445 } 446 return 0; 447 } 448 449 static int macvlan_newlink(struct net_device *dev, 450 struct nlattr *tb[], struct nlattr *data[]) 451 { 452 struct macvlan_dev *vlan = netdev_priv(dev); 453 struct macvlan_port *port; 454 struct net_device *lowerdev; 455 int err; 456 457 if (!tb[IFLA_LINK]) 458 return -EINVAL; 459 460 lowerdev = __dev_get_by_index(dev_net(dev), nla_get_u32(tb[IFLA_LINK])); 461 if (lowerdev == NULL) 462 return -ENODEV; 463 464 /* Don't allow macvlans on top of other macvlans - its not really 465 * wrong, but lockdep can't handle it and its not useful for anything 466 * you couldn't do directly on top of the real device. 467 */ 468 if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) 469 return -ENODEV; 470 471 if (!tb[IFLA_MTU]) 472 dev->mtu = lowerdev->mtu; 473 else if (dev->mtu > lowerdev->mtu) 474 return -EINVAL; 475 476 if (!tb[IFLA_ADDRESS]) 477 random_ether_addr(dev->dev_addr); 478 479 if (lowerdev->macvlan_port == NULL) { 480 err = macvlan_port_create(lowerdev); 481 if (err < 0) 482 return err; 483 } 484 port = lowerdev->macvlan_port; 485 486 vlan->lowerdev = lowerdev; 487 vlan->dev = dev; 488 vlan->port = port; 489 490 err = register_netdevice(dev); 491 if (err < 0) 492 return err; 493 494 list_add_tail(&vlan->list, &port->vlans); 495 macvlan_transfer_operstate(dev); 496 return 0; 497 } 498 499 static void macvlan_dellink(struct net_device *dev) 500 { 501 struct macvlan_dev *vlan = netdev_priv(dev); 502 struct macvlan_port *port = vlan->port; 503 504 list_del(&vlan->list); 505 unregister_netdevice(dev); 506 507 if (list_empty(&port->vlans)) 508 macvlan_port_destroy(port->dev); 509 } 510 511 static struct rtnl_link_ops macvlan_link_ops __read_mostly = { 512 .kind = "macvlan", 513 .priv_size = sizeof(struct macvlan_dev), 514 .setup = macvlan_setup, 515 .validate = macvlan_validate, 516 .newlink = macvlan_newlink, 517 .dellink = macvlan_dellink, 518 }; 519 520 static int macvlan_device_event(struct notifier_block *unused, 521 unsigned long event, void *ptr) 522 { 523 struct net_device *dev = ptr; 524 struct macvlan_dev *vlan, *next; 525 struct macvlan_port *port; 526 527 port = dev->macvlan_port; 528 if (port == NULL) 529 return NOTIFY_DONE; 530 531 switch (event) { 532 case NETDEV_CHANGE: 533 list_for_each_entry(vlan, &port->vlans, list) 534 macvlan_transfer_operstate(vlan->dev); 535 break; 536 case NETDEV_FEAT_CHANGE: 537 list_for_each_entry(vlan, &port->vlans, list) { 538 vlan->dev->features = dev->features & MACVLAN_FEATURES; 539 netdev_features_change(vlan->dev); 540 } 541 break; 542 case NETDEV_UNREGISTER: 543 list_for_each_entry_safe(vlan, next, &port->vlans, list) 544 macvlan_dellink(vlan->dev); 545 break; 546 } 547 return NOTIFY_DONE; 548 } 549 550 static struct notifier_block macvlan_notifier_block __read_mostly = { 551 .notifier_call = macvlan_device_event, 552 }; 553 554 static int __init macvlan_init_module(void) 555 { 556 int err; 557 558 register_netdevice_notifier(&macvlan_notifier_block); 559 macvlan_handle_frame_hook = macvlan_handle_frame; 560 561 err = rtnl_link_register(&macvlan_link_ops); 562 if (err < 0) 563 goto err1; 564 return 0; 565 err1: 566 macvlan_handle_frame_hook = NULL; 567 unregister_netdevice_notifier(&macvlan_notifier_block); 568 return err; 569 } 570 571 static void __exit macvlan_cleanup_module(void) 572 { 573 rtnl_link_unregister(&macvlan_link_ops); 574 macvlan_handle_frame_hook = NULL; 575 unregister_netdevice_notifier(&macvlan_notifier_block); 576 } 577 578 module_init(macvlan_init_module); 579 module_exit(macvlan_cleanup_module); 580 581 MODULE_LICENSE("GPL"); 582 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 583 MODULE_DESCRIPTION("Driver for MAC address based VLANs"); 584 MODULE_ALIAS_RTNL_LINK("macvlan"); 585