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->vlan_features      = lowerdev->vlan_features & MACVLAN_FEATURES;
 650         dev->gso_max_size       = lowerdev->gso_max_size;
 651         dev->iflink             = lowerdev->ifindex;
 652         dev->hard_header_len    = lowerdev->hard_header_len;
 653
 654         macvlan_set_lockdep_class(dev);
 655
 656         vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
 657         if (!vlan->pcpu_stats)
 658                 return -ENOMEM;
 659
 660         return 0;
 661 }
 662
 663 static void macvlan_uninit(struct net_device *dev)
 664 {
 665         struct macvlan_dev *vlan = netdev_priv(dev);
 666         struct macvlan_port *port = vlan->port;
 667
 668         free_percpu(vlan->pcpu_stats);
 669
 670         if (MACVLAN_PORT_IS_EMPTY(port))
 671                 macvlan_port_destroy(port->dev);
 672 }
 673
 674 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
 675                                                          struct rtnl_link_stats64 *stats)
 676 {
 677         struct macvlan_dev *vlan = netdev_priv(dev);
 678
 679         if (vlan->pcpu_stats) {
 680                 struct vlan_pcpu_stats *p;
 681                 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
 682                 u32 rx_errors = 0, tx_dropped = 0;
 683                 unsigned int start;
 684                 int i;
 685
 686                 for_each_possible_cpu(i) {
 687                         p = per_cpu_ptr(vlan->pcpu_stats, i);
 688                         do {
 689                                 start = u64_stats_fetch_begin_irq(&p->syncp);
 690                                 rx_packets      = p->rx_packets;
 691                                 rx_bytes        = p->rx_bytes;
 692                                 rx_multicast    = p->rx_multicast;
 693                                 tx_packets      = p->tx_packets;
 694                                 tx_bytes        = p->tx_bytes;
 695                         } while (u64_stats_fetch_retry_irq(&p->syncp, start));
 696
 697                         stats->rx_packets       += rx_packets;
 698                         stats->rx_bytes         += rx_bytes;
 699                         stats->multicast        += rx_multicast;
 700                         stats->tx_packets       += tx_packets;
 701                         stats->tx_bytes         += tx_bytes;
 702                         /* rx_errors & tx_dropped are u32, updated
 703                          * without syncp protection.
 704                          */
 705                         rx_errors       += p->rx_errors;
 706                         tx_dropped      += p->tx_dropped;
 707                 }
 708                 stats->rx_errors        = rx_errors;
 709                 stats->rx_dropped       = rx_errors;
 710                 stats->tx_dropped       = tx_dropped;
 711         }
 712         return stats;
 713 }
 714
 715 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
 716                                    __be16 proto, u16 vid)
 717 {
 718         struct macvlan_dev *vlan = netdev_priv(dev);
 719         struct net_device *lowerdev = vlan->lowerdev;
 720
 721         return vlan_vid_add(lowerdev, proto, vid);
 722 }
 723
 724 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
 725                                     __be16 proto, u16 vid)
 726 {
 727         struct macvlan_dev *vlan = netdev_priv(dev);
 728         struct net_device *lowerdev = vlan->lowerdev;
 729
 730         vlan_vid_del(lowerdev, proto, vid);
 731         return 0;
 732 }
 733
 734 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 735                            struct net_device *dev,
 736                            const unsigned char *addr,
 737                            u16 flags)
 738 {
 739         struct macvlan_dev *vlan = netdev_priv(dev);
 740         int err = -EINVAL;
 741
 742         if (!vlan->port->passthru)
 743                 return -EOPNOTSUPP;
 744
 745         if (flags & NLM_F_REPLACE)
 746                 return -EOPNOTSUPP;
 747
 748         if (is_unicast_ether_addr(addr))
 749                 err = dev_uc_add_excl(dev, addr);
 750         else if (is_multicast_ether_addr(addr))
 751                 err = dev_mc_add_excl(dev, addr);
 752
 753         return err;
 754 }
 755
 756 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
 757                            struct net_device *dev,
 758                            const unsigned char *addr)
 759 {
 760         struct macvlan_dev *vlan = netdev_priv(dev);
 761         int err = -EINVAL;
 762
 763         if (!vlan->port->passthru)
 764                 return -EOPNOTSUPP;
 765
 766         if (is_unicast_ether_addr(addr))
 767                 err = dev_uc_del(dev, addr);
 768         else if (is_multicast_ether_addr(addr))
 769                 err = dev_mc_del(dev, addr);
 770
 771         return err;
 772 }
 773
 774 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
 775                                         struct ethtool_drvinfo *drvinfo)
 776 {
 777         strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
 778         strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
 779 }
 780
 781 static int macvlan_ethtool_get_settings(struct net_device *dev,
 782                                         struct ethtool_cmd *cmd)
 783 {
 784         const struct macvlan_dev *vlan = netdev_priv(dev);
 785
 786         return __ethtool_get_settings(vlan->lowerdev, cmd);
 787 }
 788
 789 static netdev_features_t macvlan_fix_features(struct net_device *dev,
 790                                               netdev_features_t features)
 791 {
 792         struct macvlan_dev *vlan = netdev_priv(dev);
 793         netdev_features_t mask;
 794
 795         features |= NETIF_F_ALL_FOR_ALL;
 796         features &= (vlan->set_features | ~MACVLAN_FEATURES);
 797         mask = features;
 798
 799         features = netdev_increment_features(vlan->lowerdev->features,
 800                                              features,
 801                                              mask);
 802         features |= ALWAYS_ON_FEATURES;
 803
 804         return features;
 805 }
 806
 807 #ifdef CONFIG_NET_POLL_CONTROLLER
 808 static void macvlan_dev_poll_controller(struct net_device *dev)
 809 {
 810         return;
 811 }
 812
 813 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
 814 {
 815         struct macvlan_dev *vlan = netdev_priv(dev);
 816         struct net_device *real_dev = vlan->lowerdev;
 817         struct netpoll *netpoll;
 818         int err = 0;
 819
 820         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 821         err = -ENOMEM;
 822         if (!netpoll)
 823                 goto out;
 824
 825         err = __netpoll_setup(netpoll, real_dev);
 826         if (err) {
 827                 kfree(netpoll);
 828                 goto out;
 829         }
 830
 831         vlan->netpoll = netpoll;
 832
 833 out:
 834         return err;
 835 }
 836
 837 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
 838 {
 839         struct macvlan_dev *vlan = netdev_priv(dev);
 840         struct netpoll *netpoll = vlan->netpoll;
 841
 842         if (!netpoll)
 843                 return;
 844
 845         vlan->netpoll = NULL;
 846
 847         __netpoll_free_async(netpoll);
 848 }
 849 #endif  /* CONFIG_NET_POLL_CONTROLLER */
 850
 851 static const struct ethtool_ops macvlan_ethtool_ops = {
 852         .get_link               = ethtool_op_get_link,
 853         .get_settings           = macvlan_ethtool_get_settings,
 854         .get_drvinfo            = macvlan_ethtool_get_drvinfo,
 855 };
 856
 857 static const struct net_device_ops macvlan_netdev_ops = {
 858         .ndo_init               = macvlan_init,
 859         .ndo_uninit             = macvlan_uninit,
 860         .ndo_open               = macvlan_open,
 861         .ndo_stop               = macvlan_stop,
 862         .ndo_start_xmit         = macvlan_start_xmit,
 863         .ndo_change_mtu         = macvlan_change_mtu,
 864         .ndo_fix_features       = macvlan_fix_features,
 865         .ndo_change_rx_flags    = macvlan_change_rx_flags,
 866         .ndo_set_mac_address    = macvlan_set_mac_address,
 867         .ndo_set_rx_mode        = macvlan_set_mac_lists,
 868         .ndo_get_stats64        = macvlan_dev_get_stats64,
 869         .ndo_validate_addr      = eth_validate_addr,
 870         .ndo_vlan_rx_add_vid    = macvlan_vlan_rx_add_vid,
 871         .ndo_vlan_rx_kill_vid   = macvlan_vlan_rx_kill_vid,
 872         .ndo_fdb_add            = macvlan_fdb_add,
 873         .ndo_fdb_del            = macvlan_fdb_del,
 874         .ndo_fdb_dump           = ndo_dflt_fdb_dump,
 875         .ndo_get_lock_subclass  = macvlan_get_nest_level,
 876 #ifdef CONFIG_NET_POLL_CONTROLLER
 877         .ndo_poll_controller    = macvlan_dev_poll_controller,
 878         .ndo_netpoll_setup      = macvlan_dev_netpoll_setup,
 879         .ndo_netpoll_cleanup    = macvlan_dev_netpoll_cleanup,
 880 #endif
 881 };
 882
 883 void macvlan_common_setup(struct net_device *dev)
 884 {
 885         ether_setup(dev);
 886
 887         dev->priv_flags        &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
 888         dev->priv_flags        |= IFF_UNICAST_FLT;
 889         dev->netdev_ops         = &macvlan_netdev_ops;
 890         dev->destructor         = free_netdev;
 891         dev->header_ops         = &macvlan_hard_header_ops;
 892         dev->ethtool_ops        = &macvlan_ethtool_ops;
 893 }
 894 EXPORT_SYMBOL_GPL(macvlan_common_setup);
 895
 896 static void macvlan_setup(struct net_device *dev)
 897 {
 898         macvlan_common_setup(dev);
 899         dev->tx_queue_len       = 0;
 900 }
 901
 902 static int macvlan_port_create(struct net_device *dev)
 903 {
 904         struct macvlan_port *port;
 905         unsigned int i;
 906         int err;
 907
 908         if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
 909                 return -EINVAL;
 910
 911         port = kzalloc(sizeof(*port), GFP_KERNEL);
 912         if (port == NULL)
 913                 return -ENOMEM;
 914
 915         port->passthru = false;
 916         port->dev = dev;
 917         INIT_LIST_HEAD(&port->vlans);
 918         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
 919                 INIT_HLIST_HEAD(&port->vlan_hash[i]);
 920
 921         skb_queue_head_init(&port->bc_queue);
 922         INIT_WORK(&port->bc_work, macvlan_process_broadcast);
 923
 924         err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
 925         if (err)
 926                 kfree(port);
 927         else
 928                 dev->priv_flags |= IFF_MACVLAN_PORT;
 929         return err;
 930 }
 931
 932 static void macvlan_port_destroy(struct net_device *dev)
 933 {
 934         struct macvlan_port *port = macvlan_port_get_rtnl(dev);
 935
 936         cancel_work_sync(&port->bc_work);
 937         dev->priv_flags &= ~IFF_MACVLAN_PORT;
 938         netdev_rx_handler_unregister(dev);
 939         kfree_rcu(port, rcu);
 940 }
 941
 942 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
 943 {
 944         if (tb[IFLA_ADDRESS]) {
 945                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
 946                         return -EINVAL;
 947                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
 948                         return -EADDRNOTAVAIL;
 949         }
 950
 951         if (data && data[IFLA_MACVLAN_FLAGS] &&
 952             nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
 953                 return -EINVAL;
 954
 955         if (data && data[IFLA_MACVLAN_MODE]) {
 956                 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
 957                 case MACVLAN_MODE_PRIVATE:
 958                 case MACVLAN_MODE_VEPA:
 959                 case MACVLAN_MODE_BRIDGE:
 960                 case MACVLAN_MODE_PASSTHRU:
 961                         break;
 962                 default:
 963                         return -EINVAL;
 964                 }
 965         }
 966         return 0;
 967 }
 968
 969 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
 970                            struct nlattr *tb[], struct nlattr *data[])
 971 {
 972         struct macvlan_dev *vlan = netdev_priv(dev);
 973         struct macvlan_port *port;
 974         struct net_device *lowerdev;
 975         int err;
 976
 977         if (!tb[IFLA_LINK])
 978                 return -EINVAL;
 979
 980         lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
 981         if (lowerdev == NULL)
 982                 return -ENODEV;
 983
 984         /* When creating macvlans or macvtaps on top of other macvlans - use
 985          * the real device as the lowerdev.
 986          */
 987         if (netif_is_macvlan(lowerdev))
 988                 lowerdev = macvlan_dev_real_dev(lowerdev);
 989
 990         if (!tb[IFLA_MTU])
 991                 dev->mtu = lowerdev->mtu;
 992         else if (dev->mtu > lowerdev->mtu)
 993                 return -EINVAL;
 994
 995         if (!tb[IFLA_ADDRESS])
 996                 eth_hw_addr_random(dev);
 997
 998         if (!macvlan_port_exists(lowerdev)) {
 999                 err = macvlan_port_create(lowerdev);
1000                 if (err < 0)
1001                         return err;
1002         }
1003         port = macvlan_port_get_rtnl(lowerdev);
1004
1005         /* Only 1 macvlan device can be created in passthru mode */
1006         if (port->passthru)
1007                 return -EINVAL;
1008
1009         vlan->lowerdev = lowerdev;
1010         vlan->dev      = dev;
1011         vlan->port     = port;
1012         vlan->set_features = MACVLAN_FEATURES;
1013         vlan->nest_level = dev_get_nest_level(lowerdev, netif_is_macvlan) + 1;
1014
1015         vlan->mode     = MACVLAN_MODE_VEPA;
1016         if (data && data[IFLA_MACVLAN_MODE])
1017                 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1018
1019         if (data && data[IFLA_MACVLAN_FLAGS])
1020                 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1021
1022         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1023                 if (!MACVLAN_PORT_IS_EMPTY(port))
1024                         return -EINVAL;
1025                 port->passthru = true;
1026                 eth_hw_addr_inherit(dev, lowerdev);
1027         }
1028
1029         err = register_netdevice(dev);
1030         if (err < 0)
1031                 goto destroy_port;
1032
1033         dev->priv_flags |= IFF_MACVLAN;
1034         err = netdev_upper_dev_link(lowerdev, dev);
1035         if (err)
1036                 goto unregister_netdev;
1037
1038         list_add_tail_rcu(&vlan->list, &port->vlans);
1039         netif_stacked_transfer_operstate(lowerdev, dev);
1040
1041         return 0;
1042
1043 unregister_netdev:
1044         unregister_netdevice(dev);
1045 destroy_port:
1046         if (MACVLAN_PORT_IS_EMPTY(port))
1047                 macvlan_port_destroy(lowerdev);
1048
1049         return err;
1050 }
1051 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1052
1053 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1054                            struct nlattr *tb[], struct nlattr *data[])
1055 {
1056         return macvlan_common_newlink(src_net, dev, tb, data);
1057 }
1058
1059 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1060 {
1061         struct macvlan_dev *vlan = netdev_priv(dev);
1062
1063         list_del_rcu(&vlan->list);
1064         unregister_netdevice_queue(dev, head);
1065         netdev_upper_dev_unlink(vlan->lowerdev, dev);
1066 }
1067 EXPORT_SYMBOL_GPL(macvlan_dellink);
1068
1069 static int macvlan_changelink(struct net_device *dev,
1070                 struct nlattr *tb[], struct nlattr *data[])
1071 {
1072         struct macvlan_dev *vlan = netdev_priv(dev);
1073         enum macvlan_mode mode;
1074         bool set_mode = false;
1075
1076         /* Validate mode, but don't set yet: setting flags may fail. */
1077         if (data && data[IFLA_MACVLAN_MODE]) {
1078                 set_mode = true;
1079                 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1080                 /* Passthrough mode can't be set or cleared dynamically */
1081                 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1082                     (vlan->mode == MACVLAN_MODE_PASSTHRU))
1083                         return -EINVAL;
1084         }
1085
1086         if (data && data[IFLA_MACVLAN_FLAGS]) {
1087                 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1088                 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1089                 if (vlan->port->passthru && promisc) {
1090                         int err;
1091
1092                         if (flags & MACVLAN_FLAG_NOPROMISC)
1093                                 err = dev_set_promiscuity(vlan->lowerdev, -1);
1094                         else
1095                                 err = dev_set_promiscuity(vlan->lowerdev, 1);
1096                         if (err < 0)
1097                                 return err;
1098                 }
1099                 vlan->flags = flags;
1100         }
1101         if (set_mode)
1102                 vlan->mode = mode;
1103         return 0;
1104 }
1105
1106 static size_t macvlan_get_size(const struct net_device *dev)
1107 {
1108         return (0
1109                 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1110                 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1111                 );
1112 }
1113
1114 static int macvlan_fill_info(struct sk_buff *skb,
1115                                 const struct net_device *dev)
1116 {
1117         struct macvlan_dev *vlan = netdev_priv(dev);
1118
1119         if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1120                 goto nla_put_failure;
1121         if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1122                 goto nla_put_failure;
1123         return 0;
1124
1125 nla_put_failure:
1126         return -EMSGSIZE;
1127 }
1128
1129 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1130         [IFLA_MACVLAN_MODE]  = { .type = NLA_U32 },
1131         [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1132 };
1133
1134 int macvlan_link_register(struct rtnl_link_ops *ops)
1135 {
1136         /* common fields */
1137         ops->priv_size          = sizeof(struct macvlan_dev);
1138         ops->validate           = macvlan_validate;
1139         ops->maxtype            = IFLA_MACVLAN_MAX;
1140         ops->policy             = macvlan_policy;
1141         ops->changelink         = macvlan_changelink;
1142         ops->get_size           = macvlan_get_size;
1143         ops->fill_info          = macvlan_fill_info;
1144
1145         return rtnl_link_register(ops);
1146 };
1147 EXPORT_SYMBOL_GPL(macvlan_link_register);
1148
1149 static struct rtnl_link_ops macvlan_link_ops = {
1150         .kind           = "macvlan",
1151         .setup          = macvlan_setup,
1152         .newlink        = macvlan_newlink,
1153         .dellink        = macvlan_dellink,
1154 };
1155
1156 static int macvlan_device_event(struct notifier_block *unused,
1157                                 unsigned long event, void *ptr)
1158 {
1159         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1160         struct macvlan_dev *vlan, *next;
1161         struct macvlan_port *port;
1162         LIST_HEAD(list_kill);
1163
1164         if (!macvlan_port_exists(dev))
1165                 return NOTIFY_DONE;
1166
1167         port = macvlan_port_get_rtnl(dev);
1168
1169         switch (event) {
1170         case NETDEV_CHANGE:
1171                 list_for_each_entry(vlan, &port->vlans, list)
1172                         netif_stacked_transfer_operstate(vlan->lowerdev,
1173                                                          vlan->dev);
1174                 break;
1175         case NETDEV_FEAT_CHANGE:
1176                 list_for_each_entry(vlan, &port->vlans, list) {
1177                         vlan->dev->gso_max_size = dev->gso_max_size;
1178                         netdev_update_features(vlan->dev);
1179                 }
1180                 break;
1181         case NETDEV_CHANGEMTU:
1182                 list_for_each_entry(vlan, &port->vlans, list) {
1183                         if (vlan->dev->mtu <= dev->mtu)
1184                                 continue;
1185                         dev_set_mtu(vlan->dev, dev->mtu);
1186                 }
1187                 break;
1188         case NETDEV_CHANGEADDR:
1189                 if (!port->passthru)
1190                         return NOTIFY_DONE;
1191
1192                 vlan = list_first_entry_or_null(&port->vlans,
1193                                                 struct macvlan_dev,
1194                                                 list);
1195
1196                 if (macvlan_sync_address(vlan->dev, dev->dev_addr))
1197                         return NOTIFY_BAD;
1198
1199                 break;
1200         case NETDEV_UNREGISTER:
1201                 /* twiddle thumbs on netns device moves */
1202                 if (dev->reg_state != NETREG_UNREGISTERING)
1203                         break;
1204
1205                 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1206                         vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1207                 unregister_netdevice_many(&list_kill);
1208                 break;
1209         case NETDEV_PRE_TYPE_CHANGE:
1210                 /* Forbid underlaying device to change its type. */
1211                 return NOTIFY_BAD;
1212
1213         case NETDEV_NOTIFY_PEERS:
1214         case NETDEV_BONDING_FAILOVER:
1215         case NETDEV_RESEND_IGMP:
1216                 /* Propagate to all vlans */
1217                 list_for_each_entry(vlan, &port->vlans, list)
1218                         call_netdevice_notifiers(event, vlan->dev);
1219         }
1220         return NOTIFY_DONE;
1221 }
1222
1223 static struct notifier_block macvlan_notifier_block __read_mostly = {
1224         .notifier_call  = macvlan_device_event,
1225 };
1226
1227 static int __init macvlan_init_module(void)
1228 {
1229         int err;
1230
1231         register_netdevice_notifier(&macvlan_notifier_block);
1232
1233         err = macvlan_link_register(&macvlan_link_ops);
1234         if (err < 0)
1235                 goto err1;
1236         return 0;
1237 err1:
1238         unregister_netdevice_notifier(&macvlan_notifier_block);
1239         return err;
1240 }
1241
1242 static void __exit macvlan_cleanup_module(void)
1243 {
1244         rtnl_link_unregister(&macvlan_link_ops);
1245         unregister_netdevice_notifier(&macvlan_notifier_block);
1246 }
1247
1248 module_init(macvlan_init_module);
1249 module_exit(macvlan_cleanup_module);
1250
1251 MODULE_LICENSE("GPL");
1252 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1253 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1254 MODULE_ALIAS_RTNL_LINK("macvlan");