drivers/net/macvlan.c

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