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