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 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");