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_vlan.h>
  30 #include <linux/if_link.h>
  31 #include <linux/if_macvlan.h>
  32 #include <linux/hash.h>
  33 #include <linux/workqueue.h>
  34 #include <net/rtnetlink.h>
  35 #include <net/xfrm.h>
  36 #include <linux/netpoll.h>
  37
  38 #define MACVLAN_HASH_SIZE       (1 << BITS_PER_BYTE)
  39
  40 struct macvlan_port {
  41         struct net_device       *dev;
  42         struct hlist_head       vlan_hash[MACVLAN_HASH_SIZE];
  43         struct list_head        vlans;
  44         struct rcu_head         rcu;
  45         struct sk_buff_head     bc_queue;
  46         struct work_struct      bc_work;
  47         bool                    passthru;
  48 };
  49
  50 #define MACVLAN_PORT_IS_EMPTY(port)    list_empty(&port->vlans)
  51
  52 struct macvlan_skb_cb {
  53         const struct macvlan_dev *src;
  54 };
  55
  56 #define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0]))
  57
  58 static void macvlan_port_destroy(struct net_device *dev);
  59
  60 static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev)
  61 {
  62         return rcu_dereference(dev->rx_handler_data);
  63 }
  64
  65 static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev)
  66 {
  67         return rtnl_dereference(dev->rx_handler_data);
  68 }
  69
  70 #define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT)
  71
  72 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
  73                                                const unsigned char *addr)
  74 {
  75         struct macvlan_dev *vlan;
  76
  77         hlist_for_each_entry_rcu(vlan, &port->vlan_hash[addr[5]], hlist) {
  78                 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr))
  79                         return vlan;
  80         }
  81         return NULL;
  82 }
  83
  84 static void macvlan_hash_add(struct macvlan_dev *vlan)
  85 {
  86         struct macvlan_port *port = vlan->port;
  87         const unsigned char *addr = vlan->dev->dev_addr;
  88
  89         hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]);
  90 }
  91
  92 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
  93 {
  94         hlist_del_rcu(&vlan->hlist);
  95         if (sync)
  96                 synchronize_rcu();
  97 }
  98
  99 static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
 100                                         const unsigned char *addr)
 101 {
 102         macvlan_hash_del(vlan, true);
 103         /* Now that we are unhashed it is safe to change the device
 104          * address without confusing packet delivery.
 105          */
 106         memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
 107         macvlan_hash_add(vlan);
 108 }
 109
 110 static int macvlan_addr_busy(const struct macvlan_port *port,
 111                                 const unsigned char *addr)
 112 {
 113         /* Test to see if the specified multicast address is
 114          * currently in use by the underlying device or
 115          * another macvlan.
 116          */
 117         if (ether_addr_equal_64bits(port->dev->dev_addr, addr))
 118                 return 1;
 119
 120         if (macvlan_hash_lookup(port, addr))
 121                 return 1;
 122
 123         return 0;
 124 }
 125
 126
 127 static int macvlan_broadcast_one(struct sk_buff *skb,
 128                                  const struct macvlan_dev *vlan,
 129                                  const struct ethhdr *eth, bool local)
 130 {
 131         struct net_device *dev = vlan->dev;
 132
 133         if (local)
 134                 return __dev_forward_skb(dev, skb);
 135
 136         skb->dev = dev;
 137         if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
 138                 skb->pkt_type = PACKET_BROADCAST;
 139         else
 140                 skb->pkt_type = PACKET_MULTICAST;
 141
 142         return 0;
 143 }
 144
 145 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
 146 {
 147         return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT);
 148 }
 149
 150
 151 static unsigned int mc_hash(const struct macvlan_dev *vlan,
 152                             const unsigned char *addr)
 153 {
 154         u32 val = __get_unaligned_cpu32(addr + 2);
 155
 156         val ^= macvlan_hash_mix(vlan);
 157         return hash_32(val, MACVLAN_MC_FILTER_BITS);
 158 }
 159
 160 static void macvlan_broadcast(struct sk_buff *skb,
 161                               const struct macvlan_port *port,
 162                               struct net_device *src,
 163                               enum macvlan_mode mode)
 164 {
 165         const struct ethhdr *eth = eth_hdr(skb);
 166         const struct macvlan_dev *vlan;
 167         struct sk_buff *nskb;
 168         unsigned int i;
 169         int err;
 170         unsigned int hash;
 171
 172         if (skb->protocol == htons(ETH_P_PAUSE))
 173                 return;
 174
 175         for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
 176                 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) {
 177                         if (vlan->dev == src || !(vlan->mode & mode))
 178                                 continue;
 179
 180                         hash = mc_hash(vlan, eth->h_dest);
 181                         if (!test_bit(hash, vlan->mc_filter))
 182                                 continue;
 183
 184                         err = NET_RX_DROP;
 185                         nskb = skb_clone(skb, GFP_ATOMIC);
 186                         if (likely(nskb))
 187                                 err = macvlan_broadcast_one(
 188                                         nskb, vlan, eth,
 189                                         mode == MACVLAN_MODE_BRIDGE) ?:
 190                                       netif_rx_ni(nskb);
 191                         macvlan_count_rx(vlan, skb->len + ETH_HLEN,
 192                                          err == NET_RX_SUCCESS, 1);
 193                 }
 194         }
 195 }
 196
 197 static void macvlan_process_broadcast(struct work_struct *w)
 198 {
 199         struct macvlan_port *port = container_of(w, struct macvlan_port,
 200                                                  bc_work);
 201         struct sk_buff *skb;
 202         struct sk_buff_head list;
 203
 204         skb_queue_head_init(&list);
 205
 206         spin_lock_bh(&port->bc_queue.lock);
 207         skb_queue_splice_tail_init(&port->bc_queue, &list);
 208         spin_unlock_bh(&port->bc_queue.lock);
 209
 210         while ((skb = __skb_dequeue(&list))) {
 211                 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
 212
 213                 rcu_read_lock();
 214
 215                 if (!src)
 216                         /* frame comes from an external address */
 217                         macvlan_broadcast(skb, port, NULL,
 218                                           MACVLAN_MODE_PRIVATE |
 219                                           MACVLAN_MODE_VEPA    |
 220                                           MACVLAN_MODE_PASSTHRU|
 221                                           MACVLAN_MODE_BRIDGE);
 222                 else if (src->mode == MACVLAN_MODE_VEPA)
 223                         /* flood to everyone except source */
 224                         macvlan_broadcast(skb, port, src->dev,
 225                                           MACVLAN_MODE_VEPA |
 226                                           MACVLAN_MODE_BRIDGE);
 227                 else
 228                         /*
 229                          * flood only to VEPA ports, bridge ports
 230                          * already saw the frame on the way out.
 231                          */
 232                         macvlan_broadcast(skb, port, src->dev,
 233                                           MACVLAN_MODE_VEPA);
 234
 235                 rcu_read_unlock();
 236
 237                 kfree_skb(skb);
 238         }
 239 }
 240
 241 static void macvlan_broadcast_enqueue(struct macvlan_port *port,
 242                                       struct sk_buff *skb)
 243 {
 244         struct sk_buff *nskb;
 245         int err = -ENOMEM;
 246
 247         nskb = skb_clone(skb, GFP_ATOMIC);
 248         if (!nskb)
 249                 goto err;
 250
 251         spin_lock(&port->bc_queue.lock);
 252         if (skb_queue_len(&port->bc_queue) < skb->dev->tx_queue_len) {
 253                 __skb_queue_tail(&port->bc_queue, nskb);
 254                 err = 0;
 255         }
 256         spin_unlock(&port->bc_queue.lock);
 257
 258         if (err)
 259                 goto free_nskb;
 260
 261         schedule_work(&port->bc_work);
 262         return;
 263
 264 free_nskb:
 265         kfree_skb(nskb);
 266 err:
 267         atomic_long_inc(&skb->dev->rx_dropped);
 268 }
 269
 270 /* called under rcu_read_lock() from netif_receive_skb */
 271 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
 272 {
 273         struct macvlan_port *port;
 274         struct sk_buff *skb = *pskb;
 275         const struct ethhdr *eth = eth_hdr(skb);
 276         const struct macvlan_dev *vlan;
 277         const struct macvlan_dev *src;
 278         struct net_device *dev;
 279         unsigned int len = 0;
 280         int ret = NET_RX_DROP;
 281
 282         port = macvlan_port_get_rcu(skb->dev);
 283         if (is_multicast_ether_addr(eth->h_dest)) {
 284                 skb = ip_check_defrag(skb, IP_DEFRAG_MACVLAN);
 285                 if (!skb)
 286                         return RX_HANDLER_CONSUMED;
 287                 eth = eth_hdr(skb);
 288                 src = macvlan_hash_lookup(port, eth->h_source);
 289                 if (src && src->mode != MACVLAN_MODE_VEPA &&
 290                     src->mode != MACVLAN_MODE_BRIDGE) {
 291                         /* forward to original port. */
 292                         vlan = src;
 293                         ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
 294                               netif_rx(skb);
 295                         goto out;
 296                 }
 297
 298                 MACVLAN_SKB_CB(skb)->src = src;
 299                 macvlan_broadcast_enqueue(port, skb);
 300
 301                 return RX_HANDLER_PASS;
 302         }
 303
 304         if (port->passthru)
 305                 vlan = list_first_or_null_rcu(&port->vlans,
 306                                               struct macvlan_dev, list);
 307         else
 308                 vlan = macvlan_hash_lookup(port, eth->h_dest);
 309         if (vlan == NULL)
 310                 return RX_HANDLER_PASS;
 311
 312         dev = vlan->dev;
 313         if (unlikely(!(dev->flags & IFF_UP))) {
 314                 kfree_skb(skb);
 315                 return RX_HANDLER_CONSUMED;
 316         }
 317         len = skb->len + ETH_HLEN;
 318         skb = skb_share_check(skb, GFP_ATOMIC);
 319         if (!skb)
 320                 goto out;
 321
 322         skb->dev = dev;
 323         skb->pkt_type = PACKET_HOST;
 324
 325         ret = netif_rx(skb);
 326
 327 out:
 328         macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0);
 329         return RX_HANDLER_CONSUMED;
 330 }
 331
 332 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
 333 {
 334         const struct macvlan_dev *vlan = netdev_priv(dev);
 335         const struct macvlan_port *port = vlan->port;
 336         const struct macvlan_dev *dest;
 337
 338         if (vlan->mode == MACVLAN_MODE_BRIDGE) {
 339                 const struct ethhdr *eth = (void *)skb->data;
 340
 341                 /* send to other bridge ports directly */
 342                 if (is_multicast_ether_addr(eth->h_dest)) {
 343                         macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
 344                         goto xmit_world;
 345                 }
 346
 347                 dest = macvlan_hash_lookup(port, eth->h_dest);
 348                 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
 349                         /* send to lowerdev first for its network taps */
 350                         dev_forward_skb(vlan->lowerdev, skb);
 351
 352                         return NET_XMIT_SUCCESS;
 353                 }
 354         }
 355
 356 xmit_world:
 357         skb->dev = vlan->lowerdev;
 358         return dev_queue_xmit(skb);
 359 }
 360
 361 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
 362 {
 363 #ifdef CONFIG_NET_POLL_CONTROLLER
 364         if (vlan->netpoll)
 365                 netpoll_send_skb(vlan->netpoll, skb);
 366 #else
 367         BUG();
 368 #endif
 369         return NETDEV_TX_OK;
 370 }
 371
 372 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
 373                                       struct net_device *dev)
 374 {
 375         unsigned int len = skb->len;
 376         int ret;
 377         struct macvlan_dev *vlan = netdev_priv(dev);
 378
 379         if (unlikely(netpoll_tx_running(dev)))
 380                 return macvlan_netpoll_send_skb(vlan, skb);
 381
 382         if (vlan->fwd_priv) {
 383                 skb->dev = vlan->lowerdev;
 384                 ret = dev_queue_xmit_accel(skb, vlan->fwd_priv);
 385         } else {
 386                 ret = macvlan_queue_xmit(skb, dev);
 387         }
 388
 389         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 390                 struct vlan_pcpu_stats *pcpu_stats;
 391
 392                 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
 393                 u64_stats_update_begin(&pcpu_stats->syncp);
 394                 pcpu_stats->tx_packets++;
 395                 pcpu_stats->tx_bytes += len;
 396                 u64_stats_update_end(&pcpu_stats->syncp);
 397         } else {
 398                 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
 399         }
 400         return ret;
 401 }
 402
 403 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
 404                                unsigned short type, const void *daddr,
 405                                const void *saddr, unsigned len)
 406 {
 407         const struct macvlan_dev *vlan = netdev_priv(dev);
 408         struct net_device *lowerdev = vlan->lowerdev;
 409
 410         return dev_hard_header(skb, lowerdev, type, daddr,
 411                                saddr ? : dev->dev_addr, len);
 412 }
 413
 414 static const struct header_ops macvlan_hard_header_ops = {
 415         .create         = macvlan_hard_header,
 416         .rebuild        = eth_rebuild_header,
 417         .parse          = eth_header_parse,
 418         .cache          = eth_header_cache,
 419         .cache_update   = eth_header_cache_update,
 420 };
 421
 422 static struct rtnl_link_ops macvlan_link_ops;
 423
 424 static int macvlan_open(struct net_device *dev)
 425 {
 426         struct macvlan_dev *vlan = netdev_priv(dev);
 427         struct net_device *lowerdev = vlan->lowerdev;
 428         int err;
 429
 430         if (vlan->port->passthru) {
 431                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
 432                         err = dev_set_promiscuity(lowerdev, 1);
 433                         if (err < 0)
 434                                 goto out;
 435                 }
 436                 goto hash_add;
 437         }
 438
 439         if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD &&
 440             dev->rtnl_link_ops == &macvlan_link_ops) {
 441                 vlan->fwd_priv =
 442                       lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
 443
 444                 /* If we get a NULL pointer back, or if we get an error
 445                  * then we should just fall through to the non accelerated path
 446                  */
 447                 if (IS_ERR_OR_NULL(vlan->fwd_priv)) {
 448                         vlan->fwd_priv = NULL;
 449                 } else
 450                         return 0;
 451         }
 452
 453         err = -EBUSY;
 454         if (macvlan_addr_busy(vlan->port, dev->dev_addr))
 455                 goto out;
 456
 457         err = dev_uc_add(lowerdev, dev->dev_addr);
 458         if (err < 0)
 459                 goto out;
 460         if (dev->flags & IFF_ALLMULTI) {
 461                 err = dev_set_allmulti(lowerdev, 1);
 462                 if (err < 0)
 463                         goto del_unicast;
 464         }
 465
 466 hash_add:
 467         macvlan_hash_add(vlan);
 468         return 0;
 469
 470 del_unicast:
 471         dev_uc_del(lowerdev, dev->dev_addr);
 472 out:
 473         if (vlan->fwd_priv) {
 474                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
 475                                                            vlan->fwd_priv);
 476                 vlan->fwd_priv = NULL;
 477         }
 478         return err;
 479 }
 480
 481 static int macvlan_stop(struct net_device *dev)
 482 {
 483         struct macvlan_dev *vlan = netdev_priv(dev);
 484         struct net_device *lowerdev = vlan->lowerdev;
 485
 486         if (vlan->fwd_priv) {
 487                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
 488                                                            vlan->fwd_priv);
 489                 vlan->fwd_priv = NULL;
 490                 return 0;
 491         }
 492
 493         dev_uc_unsync(lowerdev, dev);
 494         dev_mc_unsync(lowerdev, dev);
 495
 496         if (vlan->port->passthru) {
 497                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
 498                         dev_set_promiscuity(lowerdev, -1);
 499                 goto hash_del;
 500         }
 501
 502         if (dev->flags & IFF_ALLMULTI)
 503                 dev_set_allmulti(lowerdev, -1);
 504
 505         dev_uc_del(lowerdev, dev->dev_addr);
 506
 507 hash_del:
 508         macvlan_hash_del(vlan, !dev->dismantle);
 509         return 0;
 510 }
 511
 512 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
 513 {
 514         struct macvlan_dev *vlan = netdev_priv(dev);
 515         struct net_device *lowerdev = vlan->lowerdev;
 516         int err;
 517
 518         if (!(dev->flags & IFF_UP)) {
 519                 /* Just copy in the new address */
 520                 ether_addr_copy(dev->dev_addr, addr);
 521         } else {
 522                 /* Rehash and update the device filters */
 523                 if (macvlan_addr_busy(vlan->port, addr))
 524                         return -EBUSY;
 525
 526                 if (!vlan->port->passthru) {
 527                         err = dev_uc_add(lowerdev, addr);
 528                         if (err)
 529                                 return err;
 530
 531                         dev_uc_del(lowerdev, dev->dev_addr);
 532                 }
 533
 534                 macvlan_hash_change_addr(vlan, addr);
 535         }
 536         return 0;
 537 }
 538
 539 static int macvlan_set_mac_address(struct net_device *dev, void *p)
 540 {
 541         struct macvlan_dev *vlan = netdev_priv(dev);
 542         struct sockaddr *addr = p;
 543
 544         if (!is_valid_ether_addr(addr->sa_data))
 545                 return -EADDRNOTAVAIL;
 546
 547         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
 548                 dev_set_mac_address(vlan->lowerdev, addr);
 549                 return 0;
 550         }
 551
 552         return macvlan_sync_address(dev, addr->sa_data);
 553 }
 554
 555 static void macvlan_change_rx_flags(struct net_device *dev, int change)
 556 {
 557         struct macvlan_dev *vlan = netdev_priv(dev);
 558         struct net_device *lowerdev = vlan->lowerdev;
 559
 560         if (dev->flags & IFF_UP) {
 561                 if (change & IFF_ALLMULTI)
 562                         dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 563         }
 564 }
 565
 566 static void macvlan_set_mac_lists(struct net_device *dev)
 567 {
 568         struct macvlan_dev *vlan = netdev_priv(dev);
 569
 570         if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
 571                 bitmap_fill(vlan->mc_filter, MACVLAN_MC_FILTER_SZ);
 572         } else {
 573                 struct netdev_hw_addr *ha;
 574                 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
 575
 576                 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
 577                 netdev_for_each_mc_addr(ha, dev) {
 578                         __set_bit(mc_hash(vlan, ha->addr), filter);
 579                 }
 580
 581                 __set_bit(mc_hash(vlan, dev->broadcast), filter);
 582
 583                 bitmap_copy(vlan->mc_filter, filter, MACVLAN_MC_FILTER_SZ);
 584         }
 585         dev_uc_sync(vlan->lowerdev, dev);
 586         dev_mc_sync(vlan->lowerdev, dev);
 587 }
 588
 589 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
 590 {
 591         struct macvlan_dev *vlan = netdev_priv(dev);
 592
 593         if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
 594                 return -EINVAL;
 595         dev->mtu = new_mtu;
 596         return 0;
 597 }
 598
 599 /*
 600  * macvlan network devices have devices nesting below it and are a special
 601  * "super class" of normal network devices; split their locks off into a
 602  * separate class since they always nest.
 603  */
 604 static struct lock_class_key macvlan_netdev_xmit_lock_key;
 605 static struct lock_class_key macvlan_netdev_addr_lock_key;
 606
 607 #define ALWAYS_ON_FEATURES \
 608         (NETIF_F_SG | NETIF_F_GEN_CSUM | NETIF_F_GSO_SOFTWARE | NETIF_F_LLTX)
 609
 610 #define MACVLAN_FEATURES \
 611         (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
 612          NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
 613          NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
 614          NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
 615
 616 #define MACVLAN_STATE_MASK \
 617         ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
 618
 619 static int macvlan_get_nest_level(struct net_device *dev)
 620 {
 621         return ((struct macvlan_dev *)netdev_priv(dev))->nest_level;
 622 }
 623
 624 static void macvlan_set_lockdep_class_one(struct net_device *dev,
 625                                           struct netdev_queue *txq,
 626                                           void *_unused)
 627 {
 628         lockdep_set_class(&txq->_xmit_lock,
 629                           &macvlan_netdev_xmit_lock_key);
 630 }
 631
 632 static void macvlan_set_lockdep_class(struct net_device *dev)
 633 {
 634         lockdep_set_class_and_subclass(&dev->addr_list_lock,
 635                                        &macvlan_netdev_addr_lock_key,
 636                                        macvlan_get_nest_level(dev));
 637         netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
 638 }
 639
 640 static int macvlan_init(struct net_device *dev)
 641 {
 642         struct macvlan_dev *vlan = netdev_priv(dev);
 643         const struct net_device *lowerdev = vlan->lowerdev;
 644
 645         dev->state              = (dev->state & ~MACVLAN_STATE_MASK) |
 646                                   (lowerdev->state & MACVLAN_STATE_MASK);
 647         dev->features           = lowerdev->features & MACVLAN_FEATURES;
 648         dev->features           |= ALWAYS_ON_FEATURES;
 649         dev->gso_max_size       = lowerdev->gso_max_size;
 650         dev->iflink             = lowerdev->ifindex;
 651         dev->hard_header_len    = lowerdev->hard_header_len;
 652
 653         macvlan_set_lockdep_class(dev);
 654
 655         vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
 656         if (!vlan->pcpu_stats)
 657                 return -ENOMEM;
 658
 659         return 0;
 660 }
 661
 662 static void macvlan_uninit(struct net_device *dev)
 663 {
 664         struct macvlan_dev *vlan = netdev_priv(dev);
 665         struct macvlan_port *port = vlan->port;
 666
 667         free_percpu(vlan->pcpu_stats);
 668
 669         if (MACVLAN_PORT_IS_EMPTY(port))
 670                 macvlan_port_destroy(port->dev);
 671 }
 672
 673 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
 674                                                          struct rtnl_link_stats64 *stats)
 675 {
 676         struct macvlan_dev *vlan = netdev_priv(dev);
 677
 678         if (vlan->pcpu_stats) {
 679                 struct vlan_pcpu_stats *p;
 680                 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
 681                 u32 rx_errors = 0, tx_dropped = 0;
 682                 unsigned int start;
 683                 int i;
 684
 685                 for_each_possible_cpu(i) {
 686                         p = per_cpu_ptr(vlan->pcpu_stats, i);
 687                         do {
 688                                 start = u64_stats_fetch_begin_irq(&p->syncp);
 689                                 rx_packets      = p->rx_packets;
 690                                 rx_bytes        = p->rx_bytes;
 691                                 rx_multicast    = p->rx_multicast;
 692                                 tx_packets      = p->tx_packets;
 693                                 tx_bytes        = p->tx_bytes;
 694                         } while (u64_stats_fetch_retry_irq(&p->syncp, start));
 695
 696                         stats->rx_packets       += rx_packets;
 697                         stats->rx_bytes         += rx_bytes;
 698                         stats->multicast        += rx_multicast;
 699                         stats->tx_packets       += tx_packets;
 700                         stats->tx_bytes         += tx_bytes;
 701                         /* rx_errors & tx_dropped are u32, updated
 702                          * without syncp protection.
 703                          */
 704                         rx_errors       += p->rx_errors;
 705                         tx_dropped      += p->tx_dropped;
 706                 }
 707                 stats->rx_errors        = rx_errors;
 708                 stats->rx_dropped       = rx_errors;
 709                 stats->tx_dropped       = tx_dropped;
 710         }
 711         return stats;
 712 }
 713
 714 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
 715                                    __be16 proto, u16 vid)
 716 {
 717         struct macvlan_dev *vlan = netdev_priv(dev);
 718         struct net_device *lowerdev = vlan->lowerdev;
 719
 720         return vlan_vid_add(lowerdev, proto, vid);
 721 }
 722
 723 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
 724                                     __be16 proto, u16 vid)
 725 {
 726         struct macvlan_dev *vlan = netdev_priv(dev);
 727         struct net_device *lowerdev = vlan->lowerdev;
 728
 729         vlan_vid_del(lowerdev, proto, vid);
 730         return 0;
 731 }
 732
 733 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 734                            struct net_device *dev,
 735                            const unsigned char *addr,
 736                            u16 flags)
 737 {
 738         struct macvlan_dev *vlan = netdev_priv(dev);
 739         int err = -EINVAL;
 740
 741         if (!vlan->port->passthru)
 742                 return -EOPNOTSUPP;
 743
 744         if (flags & NLM_F_REPLACE)
 745                 return -EOPNOTSUPP;
 746
 747         if (is_unicast_ether_addr(addr))
 748                 err = dev_uc_add_excl(dev, addr);
 749         else if (is_multicast_ether_addr(addr))
 750                 err = dev_mc_add_excl(dev, addr);
 751
 752         return err;
 753 }
 754
 755 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
 756                            struct net_device *dev,
 757                            const unsigned char *addr)
 758 {
 759         struct macvlan_dev *vlan = netdev_priv(dev);
 760         int err = -EINVAL;
 761
 762         if (!vlan->port->passthru)
 763                 return -EOPNOTSUPP;
 764
 765         if (is_unicast_ether_addr(addr))
 766                 err = dev_uc_del(dev, addr);
 767         else if (is_multicast_ether_addr(addr))
 768                 err = dev_mc_del(dev, addr);
 769
 770         return err;
 771 }
 772
 773 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
 774                                         struct ethtool_drvinfo *drvinfo)
 775 {
 776         strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
 777         strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
 778 }
 779
 780 static int macvlan_ethtool_get_settings(struct net_device *dev,
 781                                         struct ethtool_cmd *cmd)
 782 {
 783         const struct macvlan_dev *vlan = netdev_priv(dev);
 784
 785         return __ethtool_get_settings(vlan->lowerdev, cmd);
 786 }
 787
 788 static netdev_features_t macvlan_fix_features(struct net_device *dev,
 789                                               netdev_features_t features)
 790 {
 791         struct macvlan_dev *vlan = netdev_priv(dev);
 792         netdev_features_t mask;
 793
 794         features |= NETIF_F_ALL_FOR_ALL;
 795         features &= (vlan->set_features | ~MACVLAN_FEATURES);
 796         mask = features;
 797
 798         features = netdev_increment_features(vlan->lowerdev->features,
 799                                              features,
 800                                              mask);
 801         features |= ALWAYS_ON_FEATURES;
 802
 803         return features;
 804 }
 805
 806 #ifdef CONFIG_NET_POLL_CONTROLLER
 807 static void macvlan_dev_poll_controller(struct net_device *dev)
 808 {
 809         return;
 810 }
 811
 812 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
 813 {
 814         struct macvlan_dev *vlan = netdev_priv(dev);
 815         struct net_device *real_dev = vlan->lowerdev;
 816         struct netpoll *netpoll;
 817         int err = 0;
 818
 819         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 820         err = -ENOMEM;
 821         if (!netpoll)
 822                 goto out;
 823
 824         err = __netpoll_setup(netpoll, real_dev);
 825         if (err) {
 826                 kfree(netpoll);
 827                 goto out;
 828         }
 829
 830         vlan->netpoll = netpoll;
 831
 832 out:
 833         return err;
 834 }
 835
 836 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
 837 {
 838         struct macvlan_dev *vlan = netdev_priv(dev);
 839         struct netpoll *netpoll = vlan->netpoll;
 840
 841         if (!netpoll)
 842                 return;
 843
 844         vlan->netpoll = NULL;
 845
 846         __netpoll_free_async(netpoll);
 847 }
 848 #endif  /* CONFIG_NET_POLL_CONTROLLER */
 849
 850 static const struct ethtool_ops macvlan_ethtool_ops = {
 851         .get_link               = ethtool_op_get_link,
 852         .get_settings           = macvlan_ethtool_get_settings,
 853         .get_drvinfo            = macvlan_ethtool_get_drvinfo,
 854 };
 855
 856 static const struct net_device_ops macvlan_netdev_ops = {
 857         .ndo_init               = macvlan_init,
 858         .ndo_uninit             = macvlan_uninit,
 859         .ndo_open               = macvlan_open,
 860         .ndo_stop               = macvlan_stop,
 861         .ndo_start_xmit         = macvlan_start_xmit,
 862         .ndo_change_mtu         = macvlan_change_mtu,
 863         .ndo_fix_features       = macvlan_fix_features,
 864         .ndo_change_rx_flags    = macvlan_change_rx_flags,
 865         .ndo_set_mac_address    = macvlan_set_mac_address,
 866         .ndo_set_rx_mode        = macvlan_set_mac_lists,
 867         .ndo_get_stats64        = macvlan_dev_get_stats64,
 868         .ndo_validate_addr      = eth_validate_addr,
 869         .ndo_vlan_rx_add_vid    = macvlan_vlan_rx_add_vid,
 870         .ndo_vlan_rx_kill_vid   = macvlan_vlan_rx_kill_vid,
 871         .ndo_fdb_add            = macvlan_fdb_add,
 872         .ndo_fdb_del            = macvlan_fdb_del,
 873         .ndo_fdb_dump           = ndo_dflt_fdb_dump,
 874         .ndo_get_lock_subclass  = macvlan_get_nest_level,
 875 #ifdef CONFIG_NET_POLL_CONTROLLER
 876         .ndo_poll_controller    = macvlan_dev_poll_controller,
 877         .ndo_netpoll_setup      = macvlan_dev_netpoll_setup,
 878         .ndo_netpoll_cleanup    = macvlan_dev_netpoll_cleanup,
 879 #endif
 880 };
 881
 882 void macvlan_common_setup(struct net_device *dev)
 883 {
 884         ether_setup(dev);
 885
 886         dev->priv_flags        &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
 887         dev->priv_flags        |= IFF_UNICAST_FLT;
 888         dev->netdev_ops         = &macvlan_netdev_ops;
 889         dev->destructor         = free_netdev;
 890         dev->header_ops         = &macvlan_hard_header_ops;
 891         dev->ethtool_ops        = &macvlan_ethtool_ops;
 892 }
 893 EXPORT_SYMBOL_GPL(macvlan_common_setup);
 894
 895 static void macvlan_setup(struct net_device *dev)
 896 {
 897         macvlan_common_setup(dev);
 898         dev->tx_queue_len       = 0;
 899 }
 900
 901 static int macvlan_port_create(struct net_device *dev)
 902 {
 903         struct macvlan_port *port;
 904         unsigned int i;
 905         int err;
 906
 907         if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
 908                 return -EINVAL;
 909
 910         port = kzalloc(sizeof(*port), GFP_KERNEL);
 911         if (port == NULL)
 912                 return -ENOMEM;
 913
 914         port->passthru = false;
 915         port->dev = dev;
 916         INIT_LIST_HEAD(&port->vlans);
 917         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
 918                 INIT_HLIST_HEAD(&port->vlan_hash[i]);
 919
 920         skb_queue_head_init(&port->bc_queue);
 921         INIT_WORK(&port->bc_work, macvlan_process_broadcast);
 922
 923         err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
 924         if (err)
 925                 kfree(port);
 926         else
 927                 dev->priv_flags |= IFF_MACVLAN_PORT;
 928         return err;
 929 }
 930
 931 static void macvlan_port_destroy(struct net_device *dev)
 932 {
 933         struct macvlan_port *port = macvlan_port_get_rtnl(dev);
 934
 935         cancel_work_sync(&port->bc_work);
 936         dev->priv_flags &= ~IFF_MACVLAN_PORT;
 937         netdev_rx_handler_unregister(dev);
 938         kfree_rcu(port, rcu);
 939 }
 940
 941 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
 942 {
 943         if (tb[IFLA_ADDRESS]) {
 944                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
 945                         return -EINVAL;
 946                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
 947                         return -EADDRNOTAVAIL;
 948         }
 949
 950         if (data && data[IFLA_MACVLAN_FLAGS] &&
 951             nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
 952                 return -EINVAL;
 953
 954         if (data && data[IFLA_MACVLAN_MODE]) {
 955                 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
 956                 case MACVLAN_MODE_PRIVATE:
 957                 case MACVLAN_MODE_VEPA:
 958                 case MACVLAN_MODE_BRIDGE:
 959                 case MACVLAN_MODE_PASSTHRU:
 960                         break;
 961                 default:
 962                         return -EINVAL;
 963                 }
 964         }
 965         return 0;
 966 }
 967
 968 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
 969                            struct nlattr *tb[], struct nlattr *data[])
 970 {
 971         struct macvlan_dev *vlan = netdev_priv(dev);
 972         struct macvlan_port *port;
 973         struct net_device *lowerdev;
 974         int err;
 975
 976         if (!tb[IFLA_LINK])
 977                 return -EINVAL;
 978
 979         lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
 980         if (lowerdev == NULL)
 981                 return -ENODEV;
 982
 983         /* When creating macvlans or macvtaps on top of other macvlans - use
 984          * the real device as the lowerdev.
 985          */
 986         if (netif_is_macvlan(lowerdev))
 987                 lowerdev = macvlan_dev_real_dev(lowerdev);
 988
 989         if (!tb[IFLA_MTU])
 990                 dev->mtu = lowerdev->mtu;
 991         else if (dev->mtu > lowerdev->mtu)
 992                 return -EINVAL;
 993
 994         if (!tb[IFLA_ADDRESS])
 995                 eth_hw_addr_random(dev);
 996
 997         if (!macvlan_port_exists(lowerdev)) {
 998                 err = macvlan_port_create(lowerdev);
 999                 if (err < 0)
1000                         return err;
1001         }
1002         port = macvlan_port_get_rtnl(lowerdev);
1003
1004         /* Only 1 macvlan device can be created in passthru mode */
1005         if (port->passthru)
1006                 return -EINVAL;
1007
1008         vlan->lowerdev = lowerdev;
1009         vlan->dev      = dev;
1010         vlan->port     = port;
1011         vlan->set_features = MACVLAN_FEATURES;
1012         vlan->nest_level = dev_get_nest_level(lowerdev, netif_is_macvlan) + 1;
1013
1014         vlan->mode     = MACVLAN_MODE_VEPA;
1015         if (data && data[IFLA_MACVLAN_MODE])
1016                 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1017
1018         if (data && data[IFLA_MACVLAN_FLAGS])
1019                 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1020
1021         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1022                 if (!MACVLAN_PORT_IS_EMPTY(port))
1023                         return -EINVAL;
1024                 port->passthru = true;
1025                 eth_hw_addr_inherit(dev, lowerdev);
1026         }
1027
1028         err = register_netdevice(dev);
1029         if (err < 0)
1030                 goto destroy_port;
1031
1032         dev->priv_flags |= IFF_MACVLAN;
1033         err = netdev_upper_dev_link(lowerdev, dev);
1034         if (err)
1035                 goto unregister_netdev;
1036
1037         list_add_tail_rcu(&vlan->list, &port->vlans);
1038         netif_stacked_transfer_operstate(lowerdev, dev);
1039
1040         return 0;
1041
1042 unregister_netdev:
1043         unregister_netdevice(dev);
1044 destroy_port:
1045         if (MACVLAN_PORT_IS_EMPTY(port))
1046                 macvlan_port_destroy(lowerdev);
1047
1048         return err;
1049 }
1050 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1051
1052 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1053                            struct nlattr *tb[], struct nlattr *data[])
1054 {
1055         return macvlan_common_newlink(src_net, dev, tb, data);
1056 }
1057
1058 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1059 {
1060         struct macvlan_dev *vlan = netdev_priv(dev);
1061
1062         list_del_rcu(&vlan->list);
1063         unregister_netdevice_queue(dev, head);
1064         netdev_upper_dev_unlink(vlan->lowerdev, dev);
1065 }
1066 EXPORT_SYMBOL_GPL(macvlan_dellink);
1067
1068 static int macvlan_changelink(struct net_device *dev,
1069                 struct nlattr *tb[], struct nlattr *data[])
1070 {
1071         struct macvlan_dev *vlan = netdev_priv(dev);
1072         enum macvlan_mode mode;
1073         bool set_mode = false;
1074
1075         /* Validate mode, but don't set yet: setting flags may fail. */
1076         if (data && data[IFLA_MACVLAN_MODE]) {
1077                 set_mode = true;
1078                 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1079                 /* Passthrough mode can't be set or cleared dynamically */
1080                 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1081                     (vlan->mode == MACVLAN_MODE_PASSTHRU))
1082                         return -EINVAL;
1083         }
1084
1085         if (data && data[IFLA_MACVLAN_FLAGS]) {
1086                 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1087                 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1088                 if (vlan->port->passthru && promisc) {
1089                         int err;
1090
1091                         if (flags & MACVLAN_FLAG_NOPROMISC)
1092                                 err = dev_set_promiscuity(vlan->lowerdev, -1);
1093                         else
1094                                 err = dev_set_promiscuity(vlan->lowerdev, 1);
1095                         if (err < 0)
1096                                 return err;
1097                 }
1098                 vlan->flags = flags;
1099         }
1100         if (set_mode)
1101                 vlan->mode = mode;
1102         return 0;
1103 }
1104
1105 static size_t macvlan_get_size(const struct net_device *dev)
1106 {
1107         return (0
1108                 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1109                 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1110                 );
1111 }
1112
1113 static int macvlan_fill_info(struct sk_buff *skb,
1114                                 const struct net_device *dev)
1115 {
1116         struct macvlan_dev *vlan = netdev_priv(dev);
1117
1118         if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1119                 goto nla_put_failure;
1120         if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1121                 goto nla_put_failure;
1122         return 0;
1123
1124 nla_put_failure:
1125         return -EMSGSIZE;
1126 }
1127
1128 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1129         [IFLA_MACVLAN_MODE]  = { .type = NLA_U32 },
1130         [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1131 };
1132
1133 int macvlan_link_register(struct rtnl_link_ops *ops)
1134 {
1135         /* common fields */
1136         ops->priv_size          = sizeof(struct macvlan_dev);
1137         ops->validate           = macvlan_validate;
1138         ops->maxtype            = IFLA_MACVLAN_MAX;
1139         ops->policy             = macvlan_policy;
1140         ops->changelink         = macvlan_changelink;
1141         ops->get_size           = macvlan_get_size;
1142         ops->fill_info          = macvlan_fill_info;
1143
1144         return rtnl_link_register(ops);
1145 };
1146 EXPORT_SYMBOL_GPL(macvlan_link_register);
1147
1148 static struct rtnl_link_ops macvlan_link_ops = {
1149         .kind           = "macvlan",
1150         .setup          = macvlan_setup,
1151         .newlink        = macvlan_newlink,
1152         .dellink        = macvlan_dellink,
1153 };
1154
1155 static int macvlan_device_event(struct notifier_block *unused,
1156                                 unsigned long event, void *ptr)
1157 {
1158         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1159         struct macvlan_dev *vlan, *next;
1160         struct macvlan_port *port;
1161         LIST_HEAD(list_kill);
1162
1163         if (!macvlan_port_exists(dev))
1164                 return NOTIFY_DONE;
1165
1166         port = macvlan_port_get_rtnl(dev);
1167
1168         switch (event) {
1169         case NETDEV_CHANGE:
1170                 list_for_each_entry(vlan, &port->vlans, list)
1171                         netif_stacked_transfer_operstate(vlan->lowerdev,
1172                                                          vlan->dev);
1173                 break;
1174         case NETDEV_FEAT_CHANGE:
1175                 list_for_each_entry(vlan, &port->vlans, list) {
1176                         vlan->dev->gso_max_size = dev->gso_max_size;
1177                         netdev_update_features(vlan->dev);
1178                 }
1179                 break;
1180         case NETDEV_CHANGEMTU:
1181                 list_for_each_entry(vlan, &port->vlans, list) {
1182                         if (vlan->dev->mtu <= dev->mtu)
1183                                 continue;
1184                         dev_set_mtu(vlan->dev, dev->mtu);
1185                 }
1186                 break;
1187         case NETDEV_CHANGEADDR:
1188                 if (!port->passthru)
1189                         return NOTIFY_DONE;
1190
1191                 vlan = list_first_entry_or_null(&port->vlans,
1192                                                 struct macvlan_dev,
1193                                                 list);
1194
1195                 if (macvlan_sync_address(vlan->dev, dev->dev_addr))
1196                         return NOTIFY_BAD;
1197
1198                 break;
1199         case NETDEV_UNREGISTER:
1200                 /* twiddle thumbs on netns device moves */
1201                 if (dev->reg_state != NETREG_UNREGISTERING)
1202                         break;
1203
1204                 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1205                         vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1206                 unregister_netdevice_many(&list_kill);
1207                 break;
1208         case NETDEV_PRE_TYPE_CHANGE:
1209                 /* Forbid underlaying device to change its type. */
1210                 return NOTIFY_BAD;
1211
1212         case NETDEV_NOTIFY_PEERS:
1213         case NETDEV_BONDING_FAILOVER:
1214         case NETDEV_RESEND_IGMP:
1215                 /* Propagate to all vlans */
1216                 list_for_each_entry(vlan, &port->vlans, list)
1217                         call_netdevice_notifiers(event, vlan->dev);
1218         }
1219         return NOTIFY_DONE;
1220 }
1221
1222 static struct notifier_block macvlan_notifier_block __read_mostly = {
1223         .notifier_call  = macvlan_device_event,
1224 };
1225
1226 static int __init macvlan_init_module(void)
1227 {
1228         int err;
1229
1230         register_netdevice_notifier(&macvlan_notifier_block);
1231
1232         err = macvlan_link_register(&macvlan_link_ops);
1233         if (err < 0)
1234                 goto err1;
1235         return 0;
1236 err1:
1237         unregister_netdevice_notifier(&macvlan_notifier_block);
1238         return err;
1239 }
1240
1241 static void __exit macvlan_cleanup_module(void)
1242 {
1243         rtnl_link_unregister(&macvlan_link_ops);
1244         unregister_netdevice_notifier(&macvlan_notifier_block);
1245 }
1246
1247 module_init(macvlan_init_module);
1248 module_exit(macvlan_cleanup_module);
1249
1250 MODULE_LICENSE("GPL");
1251 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1252 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1253 MODULE_ALIAS_RTNL_LINK("macvlan");