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 #include <net/xfrm.h> 33 34 #define MACVLAN_HASH_SIZE (1 << BITS_PER_BYTE) 35 36 struct macvlan_port { 37 struct net_device *dev; 38 struct hlist_head vlan_hash[MACVLAN_HASH_SIZE]; 39 struct list_head vlans; 40 }; 41 42 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port, 43 const unsigned char *addr) 44 { 45 struct macvlan_dev *vlan; 46 struct hlist_node *n; 47 48 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[addr[5]], hlist) { 49 if (!compare_ether_addr_64bits(vlan->dev->dev_addr, addr)) 50 return vlan; 51 } 52 return NULL; 53 } 54 55 static void macvlan_hash_add(struct macvlan_dev *vlan) 56 { 57 struct macvlan_port *port = vlan->port; 58 const unsigned char *addr = vlan->dev->dev_addr; 59 60 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]); 61 } 62 63 static void macvlan_hash_del(struct macvlan_dev *vlan) 64 { 65 hlist_del_rcu(&vlan->hlist); 66 synchronize_rcu(); 67 } 68 69 static void macvlan_hash_change_addr(struct macvlan_dev *vlan, 70 const unsigned char *addr) 71 { 72 macvlan_hash_del(vlan); 73 /* Now that we are unhashed it is safe to change the device 74 * address without confusing packet delivery. 75 */ 76 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN); 77 macvlan_hash_add(vlan); 78 } 79 80 static int macvlan_addr_busy(const struct macvlan_port *port, 81 const unsigned char *addr) 82 { 83 /* Test to see if the specified multicast address is 84 * currently in use by the underlying device or 85 * another macvlan. 86 */ 87 if (!compare_ether_addr_64bits(port->dev->dev_addr, addr)) 88 return 1; 89 90 if (macvlan_hash_lookup(port, addr)) 91 return 1; 92 93 return 0; 94 } 95 96 97 static int macvlan_broadcast_one(struct sk_buff *skb, 98 const struct macvlan_dev *vlan, 99 const struct ethhdr *eth, bool local) 100 { 101 struct net_device *dev = vlan->dev; 102 if (!skb) 103 return NET_RX_DROP; 104 105 if (local) 106 return vlan->forward(dev, skb); 107 108 skb->dev = dev; 109 if (!compare_ether_addr_64bits(eth->h_dest, 110 dev->broadcast)) 111 skb->pkt_type = PACKET_BROADCAST; 112 else 113 skb->pkt_type = PACKET_MULTICAST; 114 115 return vlan->receive(skb); 116 } 117 118 static void macvlan_broadcast(struct sk_buff *skb, 119 const struct macvlan_port *port, 120 struct net_device *src, 121 enum macvlan_mode mode) 122 { 123 const struct ethhdr *eth = eth_hdr(skb); 124 const struct macvlan_dev *vlan; 125 struct hlist_node *n; 126 struct sk_buff *nskb; 127 unsigned int i; 128 int err; 129 130 if (skb->protocol == htons(ETH_P_PAUSE)) 131 return; 132 133 for (i = 0; i < MACVLAN_HASH_SIZE; i++) { 134 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[i], hlist) { 135 if (vlan->dev == src || !(vlan->mode & mode)) 136 continue; 137 138 nskb = skb_clone(skb, GFP_ATOMIC); 139 err = macvlan_broadcast_one(nskb, vlan, eth, 140 mode == MACVLAN_MODE_BRIDGE); 141 macvlan_count_rx(vlan, skb->len + ETH_HLEN, 142 err == NET_RX_SUCCESS, 1); 143 } 144 } 145 } 146 147 /* called under rcu_read_lock() from netif_receive_skb */ 148 static struct sk_buff *macvlan_handle_frame(struct macvlan_port *port, 149 struct sk_buff *skb) 150 { 151 const struct ethhdr *eth = eth_hdr(skb); 152 const struct macvlan_dev *vlan; 153 const struct macvlan_dev *src; 154 struct net_device *dev; 155 unsigned int len; 156 157 if (is_multicast_ether_addr(eth->h_dest)) { 158 src = macvlan_hash_lookup(port, eth->h_source); 159 if (!src) 160 /* frame comes from an external address */ 161 macvlan_broadcast(skb, port, NULL, 162 MACVLAN_MODE_PRIVATE | 163 MACVLAN_MODE_VEPA | 164 MACVLAN_MODE_BRIDGE); 165 else if (src->mode == MACVLAN_MODE_VEPA) 166 /* flood to everyone except source */ 167 macvlan_broadcast(skb, port, src->dev, 168 MACVLAN_MODE_VEPA | 169 MACVLAN_MODE_BRIDGE); 170 else if (src->mode == MACVLAN_MODE_BRIDGE) 171 /* 172 * flood only to VEPA ports, bridge ports 173 * already saw the frame on the way out. 174 */ 175 macvlan_broadcast(skb, port, src->dev, 176 MACVLAN_MODE_VEPA); 177 return skb; 178 } 179 180 vlan = macvlan_hash_lookup(port, eth->h_dest); 181 if (vlan == NULL) 182 return skb; 183 184 dev = vlan->dev; 185 if (unlikely(!(dev->flags & IFF_UP))) { 186 kfree_skb(skb); 187 return NULL; 188 } 189 len = skb->len + ETH_HLEN; 190 skb = skb_share_check(skb, GFP_ATOMIC); 191 macvlan_count_rx(vlan, len, skb != NULL, 0); 192 if (!skb) 193 return NULL; 194 195 skb->dev = dev; 196 skb->pkt_type = PACKET_HOST; 197 198 vlan->receive(skb); 199 return NULL; 200 } 201 202 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev) 203 { 204 const struct macvlan_dev *vlan = netdev_priv(dev); 205 const struct macvlan_port *port = vlan->port; 206 const struct macvlan_dev *dest; 207 208 if (vlan->mode == MACVLAN_MODE_BRIDGE) { 209 const struct ethhdr *eth = (void *)skb->data; 210 211 /* send to other bridge ports directly */ 212 if (is_multicast_ether_addr(eth->h_dest)) { 213 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE); 214 goto xmit_world; 215 } 216 217 dest = macvlan_hash_lookup(port, eth->h_dest); 218 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) { 219 unsigned int length = skb->len + ETH_HLEN; 220 int ret = dest->forward(dest->dev, skb); 221 macvlan_count_rx(dest, length, 222 ret == NET_RX_SUCCESS, 0); 223 224 return NET_XMIT_SUCCESS; 225 } 226 } 227 228 xmit_world: 229 skb_set_dev(skb, vlan->lowerdev); 230 return dev_queue_xmit(skb); 231 } 232 233 netdev_tx_t macvlan_start_xmit(struct sk_buff *skb, 234 struct net_device *dev) 235 { 236 int i = skb_get_queue_mapping(skb); 237 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 238 unsigned int len = skb->len; 239 int ret; 240 241 ret = macvlan_queue_xmit(skb, dev); 242 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 243 txq->tx_packets++; 244 txq->tx_bytes += len; 245 } else 246 txq->tx_dropped++; 247 248 return ret; 249 } 250 EXPORT_SYMBOL_GPL(macvlan_start_xmit); 251 252 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 253 unsigned short type, const void *daddr, 254 const void *saddr, unsigned len) 255 { 256 const struct macvlan_dev *vlan = netdev_priv(dev); 257 struct net_device *lowerdev = vlan->lowerdev; 258 259 return dev_hard_header(skb, lowerdev, type, daddr, 260 saddr ? : dev->dev_addr, len); 261 } 262 263 static const struct header_ops macvlan_hard_header_ops = { 264 .create = macvlan_hard_header, 265 .rebuild = eth_rebuild_header, 266 .parse = eth_header_parse, 267 .cache = eth_header_cache, 268 .cache_update = eth_header_cache_update, 269 }; 270 271 static int macvlan_open(struct net_device *dev) 272 { 273 struct macvlan_dev *vlan = netdev_priv(dev); 274 struct net_device *lowerdev = vlan->lowerdev; 275 int err; 276 277 err = -EBUSY; 278 if (macvlan_addr_busy(vlan->port, dev->dev_addr)) 279 goto out; 280 281 err = dev_uc_add(lowerdev, dev->dev_addr); 282 if (err < 0) 283 goto out; 284 if (dev->flags & IFF_ALLMULTI) { 285 err = dev_set_allmulti(lowerdev, 1); 286 if (err < 0) 287 goto del_unicast; 288 } 289 macvlan_hash_add(vlan); 290 return 0; 291 292 del_unicast: 293 dev_uc_del(lowerdev, dev->dev_addr); 294 out: 295 return err; 296 } 297 298 static int macvlan_stop(struct net_device *dev) 299 { 300 struct macvlan_dev *vlan = netdev_priv(dev); 301 struct net_device *lowerdev = vlan->lowerdev; 302 303 dev_mc_unsync(lowerdev, dev); 304 if (dev->flags & IFF_ALLMULTI) 305 dev_set_allmulti(lowerdev, -1); 306 307 dev_uc_del(lowerdev, dev->dev_addr); 308 309 macvlan_hash_del(vlan); 310 return 0; 311 } 312 313 static int macvlan_set_mac_address(struct net_device *dev, void *p) 314 { 315 struct macvlan_dev *vlan = netdev_priv(dev); 316 struct net_device *lowerdev = vlan->lowerdev; 317 struct sockaddr *addr = p; 318 int err; 319 320 if (!is_valid_ether_addr(addr->sa_data)) 321 return -EADDRNOTAVAIL; 322 323 if (!(dev->flags & IFF_UP)) { 324 /* Just copy in the new address */ 325 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); 326 } else { 327 /* Rehash and update the device filters */ 328 if (macvlan_addr_busy(vlan->port, addr->sa_data)) 329 return -EBUSY; 330 331 err = dev_uc_add(lowerdev, addr->sa_data); 332 if (err) 333 return err; 334 335 dev_uc_del(lowerdev, dev->dev_addr); 336 337 macvlan_hash_change_addr(vlan, addr->sa_data); 338 } 339 return 0; 340 } 341 342 static void macvlan_change_rx_flags(struct net_device *dev, int change) 343 { 344 struct macvlan_dev *vlan = netdev_priv(dev); 345 struct net_device *lowerdev = vlan->lowerdev; 346 347 if (change & IFF_ALLMULTI) 348 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1); 349 } 350 351 static void macvlan_set_multicast_list(struct net_device *dev) 352 { 353 struct macvlan_dev *vlan = netdev_priv(dev); 354 355 dev_mc_sync(vlan->lowerdev, dev); 356 } 357 358 static int macvlan_change_mtu(struct net_device *dev, int new_mtu) 359 { 360 struct macvlan_dev *vlan = netdev_priv(dev); 361 362 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu) 363 return -EINVAL; 364 dev->mtu = new_mtu; 365 return 0; 366 } 367 368 /* 369 * macvlan network devices have devices nesting below it and are a special 370 * "super class" of normal network devices; split their locks off into a 371 * separate class since they always nest. 372 */ 373 static struct lock_class_key macvlan_netdev_xmit_lock_key; 374 static struct lock_class_key macvlan_netdev_addr_lock_key; 375 376 #define MACVLAN_FEATURES \ 377 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 378 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \ 379 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO) 380 381 #define MACVLAN_STATE_MASK \ 382 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 383 384 static void macvlan_set_lockdep_class_one(struct net_device *dev, 385 struct netdev_queue *txq, 386 void *_unused) 387 { 388 lockdep_set_class(&txq->_xmit_lock, 389 &macvlan_netdev_xmit_lock_key); 390 } 391 392 static void macvlan_set_lockdep_class(struct net_device *dev) 393 { 394 lockdep_set_class(&dev->addr_list_lock, 395 &macvlan_netdev_addr_lock_key); 396 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL); 397 } 398 399 static int macvlan_init(struct net_device *dev) 400 { 401 struct macvlan_dev *vlan = netdev_priv(dev); 402 const struct net_device *lowerdev = vlan->lowerdev; 403 404 dev->state = (dev->state & ~MACVLAN_STATE_MASK) | 405 (lowerdev->state & MACVLAN_STATE_MASK); 406 dev->features = lowerdev->features & MACVLAN_FEATURES; 407 dev->gso_max_size = lowerdev->gso_max_size; 408 dev->iflink = lowerdev->ifindex; 409 dev->hard_header_len = lowerdev->hard_header_len; 410 411 macvlan_set_lockdep_class(dev); 412 413 vlan->rx_stats = alloc_percpu(struct macvlan_rx_stats); 414 if (!vlan->rx_stats) 415 return -ENOMEM; 416 417 return 0; 418 } 419 420 static void macvlan_uninit(struct net_device *dev) 421 { 422 struct macvlan_dev *vlan = netdev_priv(dev); 423 424 free_percpu(vlan->rx_stats); 425 } 426 427 static struct net_device_stats *macvlan_dev_get_stats(struct net_device *dev) 428 { 429 struct net_device_stats *stats = &dev->stats; 430 struct macvlan_dev *vlan = netdev_priv(dev); 431 432 dev_txq_stats_fold(dev, stats); 433 434 if (vlan->rx_stats) { 435 struct macvlan_rx_stats *p, rx = {0}; 436 int i; 437 438 for_each_possible_cpu(i) { 439 p = per_cpu_ptr(vlan->rx_stats, i); 440 rx.rx_packets += p->rx_packets; 441 rx.rx_bytes += p->rx_bytes; 442 rx.rx_errors += p->rx_errors; 443 rx.multicast += p->multicast; 444 } 445 stats->rx_packets = rx.rx_packets; 446 stats->rx_bytes = rx.rx_bytes; 447 stats->rx_errors = rx.rx_errors; 448 stats->rx_dropped = rx.rx_errors; 449 stats->multicast = rx.multicast; 450 } 451 return stats; 452 } 453 454 static void macvlan_ethtool_get_drvinfo(struct net_device *dev, 455 struct ethtool_drvinfo *drvinfo) 456 { 457 snprintf(drvinfo->driver, 32, "macvlan"); 458 snprintf(drvinfo->version, 32, "0.1"); 459 } 460 461 static u32 macvlan_ethtool_get_rx_csum(struct net_device *dev) 462 { 463 const struct macvlan_dev *vlan = netdev_priv(dev); 464 return dev_ethtool_get_rx_csum(vlan->lowerdev); 465 } 466 467 static int macvlan_ethtool_get_settings(struct net_device *dev, 468 struct ethtool_cmd *cmd) 469 { 470 const struct macvlan_dev *vlan = netdev_priv(dev); 471 return dev_ethtool_get_settings(vlan->lowerdev, cmd); 472 } 473 474 static u32 macvlan_ethtool_get_flags(struct net_device *dev) 475 { 476 const struct macvlan_dev *vlan = netdev_priv(dev); 477 return dev_ethtool_get_flags(vlan->lowerdev); 478 } 479 480 static const struct ethtool_ops macvlan_ethtool_ops = { 481 .get_link = ethtool_op_get_link, 482 .get_settings = macvlan_ethtool_get_settings, 483 .get_rx_csum = macvlan_ethtool_get_rx_csum, 484 .get_drvinfo = macvlan_ethtool_get_drvinfo, 485 .get_flags = macvlan_ethtool_get_flags, 486 }; 487 488 static const struct net_device_ops macvlan_netdev_ops = { 489 .ndo_init = macvlan_init, 490 .ndo_uninit = macvlan_uninit, 491 .ndo_open = macvlan_open, 492 .ndo_stop = macvlan_stop, 493 .ndo_start_xmit = macvlan_start_xmit, 494 .ndo_change_mtu = macvlan_change_mtu, 495 .ndo_change_rx_flags = macvlan_change_rx_flags, 496 .ndo_set_mac_address = macvlan_set_mac_address, 497 .ndo_set_multicast_list = macvlan_set_multicast_list, 498 .ndo_get_stats = macvlan_dev_get_stats, 499 .ndo_validate_addr = eth_validate_addr, 500 }; 501 502 static void macvlan_setup(struct net_device *dev) 503 { 504 ether_setup(dev); 505 506 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; 507 dev->netdev_ops = &macvlan_netdev_ops; 508 dev->destructor = free_netdev; 509 dev->header_ops = &macvlan_hard_header_ops, 510 dev->ethtool_ops = &macvlan_ethtool_ops; 511 dev->tx_queue_len = 0; 512 } 513 514 static int macvlan_port_create(struct net_device *dev) 515 { 516 struct macvlan_port *port; 517 unsigned int i; 518 519 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) 520 return -EINVAL; 521 522 port = kzalloc(sizeof(*port), GFP_KERNEL); 523 if (port == NULL) 524 return -ENOMEM; 525 526 port->dev = dev; 527 INIT_LIST_HEAD(&port->vlans); 528 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 529 INIT_HLIST_HEAD(&port->vlan_hash[i]); 530 rcu_assign_pointer(dev->macvlan_port, port); 531 return 0; 532 } 533 534 static void macvlan_port_destroy(struct net_device *dev) 535 { 536 struct macvlan_port *port = dev->macvlan_port; 537 538 rcu_assign_pointer(dev->macvlan_port, NULL); 539 synchronize_rcu(); 540 kfree(port); 541 } 542 543 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[]) 544 { 545 if (tb[IFLA_ADDRESS]) { 546 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 547 return -EINVAL; 548 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 549 return -EADDRNOTAVAIL; 550 } 551 552 if (data && data[IFLA_MACVLAN_MODE]) { 553 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) { 554 case MACVLAN_MODE_PRIVATE: 555 case MACVLAN_MODE_VEPA: 556 case MACVLAN_MODE_BRIDGE: 557 break; 558 default: 559 return -EINVAL; 560 } 561 } 562 return 0; 563 } 564 565 static int macvlan_get_tx_queues(struct net *net, 566 struct nlattr *tb[], 567 unsigned int *num_tx_queues, 568 unsigned int *real_num_tx_queues) 569 { 570 struct net_device *real_dev; 571 572 if (!tb[IFLA_LINK]) 573 return -EINVAL; 574 575 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK])); 576 if (!real_dev) 577 return -ENODEV; 578 579 *num_tx_queues = real_dev->num_tx_queues; 580 *real_num_tx_queues = real_dev->real_num_tx_queues; 581 return 0; 582 } 583 584 int macvlan_common_newlink(struct net *src_net, struct net_device *dev, 585 struct nlattr *tb[], struct nlattr *data[], 586 int (*receive)(struct sk_buff *skb), 587 int (*forward)(struct net_device *dev, 588 struct sk_buff *skb)) 589 { 590 struct macvlan_dev *vlan = netdev_priv(dev); 591 struct macvlan_port *port; 592 struct net_device *lowerdev; 593 int err; 594 595 if (!tb[IFLA_LINK]) 596 return -EINVAL; 597 598 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 599 if (lowerdev == NULL) 600 return -ENODEV; 601 602 /* When creating macvlans on top of other macvlans - use 603 * the real device as the lowerdev. 604 */ 605 if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) { 606 struct macvlan_dev *lowervlan = netdev_priv(lowerdev); 607 lowerdev = lowervlan->lowerdev; 608 } 609 610 if (!tb[IFLA_MTU]) 611 dev->mtu = lowerdev->mtu; 612 else if (dev->mtu > lowerdev->mtu) 613 return -EINVAL; 614 615 if (!tb[IFLA_ADDRESS]) 616 random_ether_addr(dev->dev_addr); 617 618 if (lowerdev->macvlan_port == NULL) { 619 err = macvlan_port_create(lowerdev); 620 if (err < 0) 621 return err; 622 } 623 port = lowerdev->macvlan_port; 624 625 vlan->lowerdev = lowerdev; 626 vlan->dev = dev; 627 vlan->port = port; 628 vlan->receive = receive; 629 vlan->forward = forward; 630 631 vlan->mode = MACVLAN_MODE_VEPA; 632 if (data && data[IFLA_MACVLAN_MODE]) 633 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 634 635 err = register_netdevice(dev); 636 if (err < 0) 637 goto destroy_port; 638 639 list_add_tail(&vlan->list, &port->vlans); 640 netif_stacked_transfer_operstate(lowerdev, dev); 641 642 return 0; 643 644 destroy_port: 645 if (list_empty(&port->vlans)) 646 macvlan_port_destroy(lowerdev); 647 648 return err; 649 } 650 EXPORT_SYMBOL_GPL(macvlan_common_newlink); 651 652 static int macvlan_newlink(struct net *src_net, struct net_device *dev, 653 struct nlattr *tb[], struct nlattr *data[]) 654 { 655 return macvlan_common_newlink(src_net, dev, tb, data, 656 netif_rx, 657 dev_forward_skb); 658 } 659 660 void macvlan_dellink(struct net_device *dev, struct list_head *head) 661 { 662 struct macvlan_dev *vlan = netdev_priv(dev); 663 struct macvlan_port *port = vlan->port; 664 665 list_del(&vlan->list); 666 unregister_netdevice_queue(dev, head); 667 668 if (list_empty(&port->vlans)) 669 macvlan_port_destroy(port->dev); 670 } 671 EXPORT_SYMBOL_GPL(macvlan_dellink); 672 673 static int macvlan_changelink(struct net_device *dev, 674 struct nlattr *tb[], struct nlattr *data[]) 675 { 676 struct macvlan_dev *vlan = netdev_priv(dev); 677 if (data && data[IFLA_MACVLAN_MODE]) 678 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 679 return 0; 680 } 681 682 static size_t macvlan_get_size(const struct net_device *dev) 683 { 684 return nla_total_size(4); 685 } 686 687 static int macvlan_fill_info(struct sk_buff *skb, 688 const struct net_device *dev) 689 { 690 struct macvlan_dev *vlan = netdev_priv(dev); 691 692 NLA_PUT_U32(skb, IFLA_MACVLAN_MODE, vlan->mode); 693 return 0; 694 695 nla_put_failure: 696 return -EMSGSIZE; 697 } 698 699 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = { 700 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 }, 701 }; 702 703 int macvlan_link_register(struct rtnl_link_ops *ops) 704 { 705 /* common fields */ 706 ops->priv_size = sizeof(struct macvlan_dev); 707 ops->get_tx_queues = macvlan_get_tx_queues; 708 ops->setup = macvlan_setup; 709 ops->validate = macvlan_validate; 710 ops->maxtype = IFLA_MACVLAN_MAX; 711 ops->policy = macvlan_policy; 712 ops->changelink = macvlan_changelink; 713 ops->get_size = macvlan_get_size; 714 ops->fill_info = macvlan_fill_info; 715 716 return rtnl_link_register(ops); 717 }; 718 EXPORT_SYMBOL_GPL(macvlan_link_register); 719 720 static struct rtnl_link_ops macvlan_link_ops = { 721 .kind = "macvlan", 722 .newlink = macvlan_newlink, 723 .dellink = macvlan_dellink, 724 }; 725 726 static int macvlan_device_event(struct notifier_block *unused, 727 unsigned long event, void *ptr) 728 { 729 struct net_device *dev = ptr; 730 struct macvlan_dev *vlan, *next; 731 struct macvlan_port *port; 732 733 port = dev->macvlan_port; 734 if (port == NULL) 735 return NOTIFY_DONE; 736 737 switch (event) { 738 case NETDEV_CHANGE: 739 list_for_each_entry(vlan, &port->vlans, list) 740 netif_stacked_transfer_operstate(vlan->lowerdev, 741 vlan->dev); 742 break; 743 case NETDEV_FEAT_CHANGE: 744 list_for_each_entry(vlan, &port->vlans, list) { 745 vlan->dev->features = dev->features & MACVLAN_FEATURES; 746 vlan->dev->gso_max_size = dev->gso_max_size; 747 netdev_features_change(vlan->dev); 748 } 749 break; 750 case NETDEV_UNREGISTER: 751 list_for_each_entry_safe(vlan, next, &port->vlans, list) 752 vlan->dev->rtnl_link_ops->dellink(vlan->dev, NULL); 753 break; 754 case NETDEV_PRE_TYPE_CHANGE: 755 /* Forbid underlaying device to change its type. */ 756 return NOTIFY_BAD; 757 } 758 return NOTIFY_DONE; 759 } 760 761 static struct notifier_block macvlan_notifier_block __read_mostly = { 762 .notifier_call = macvlan_device_event, 763 }; 764 765 static int __init macvlan_init_module(void) 766 { 767 int err; 768 769 register_netdevice_notifier(&macvlan_notifier_block); 770 macvlan_handle_frame_hook = macvlan_handle_frame; 771 772 err = macvlan_link_register(&macvlan_link_ops); 773 if (err < 0) 774 goto err1; 775 return 0; 776 err1: 777 macvlan_handle_frame_hook = NULL; 778 unregister_netdevice_notifier(&macvlan_notifier_block); 779 return err; 780 } 781 782 static void __exit macvlan_cleanup_module(void) 783 { 784 rtnl_link_unregister(&macvlan_link_ops); 785 macvlan_handle_frame_hook = NULL; 786 unregister_netdevice_notifier(&macvlan_notifier_block); 787 } 788 789 module_init(macvlan_init_module); 790 module_exit(macvlan_cleanup_module); 791 792 MODULE_LICENSE("GPL"); 793 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 794 MODULE_DESCRIPTION("Driver for MAC address based VLANs"); 795 MODULE_ALIAS_RTNL_LINK("macvlan"); 796