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         int                     count;
  49 };
  50
  51 struct macvlan_skb_cb {
  52         const struct macvlan_dev *src;
  53 };
  54
  55 #define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0]))
  56
  57 static void macvlan_port_destroy(struct net_device *dev);
  58
  59 static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev)
  60 {
  61         return rcu_dereference(dev->rx_handler_data);
  62 }
  63
  64 static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev)
  65 {
  66         return rtnl_dereference(dev->rx_handler_data);
  67 }
  68
  69 #define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT)
  70
  71 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
  72                                                const unsigned char *addr)
  73 {
  74         struct macvlan_dev *vlan;
  75
  76         hlist_for_each_entry_rcu(vlan, &port->vlan_hash[addr[5]], hlist) {
  77                 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr))
  78                         return vlan;
  79         }
  80         return NULL;
  81 }
  82
  83 static void macvlan_hash_add(struct macvlan_dev *vlan)
  84 {
  85         struct macvlan_port *port = vlan->port;
  86         const unsigned char *addr = vlan->dev->dev_addr;
  87
  88         hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]);
  89 }
  90
  91 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
  92 {
  93         hlist_del_rcu(&vlan->hlist);
  94         if (sync)
  95                 synchronize_rcu();
  96 }
  97
  98 static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
  99                                         const unsigned char *addr)
 100 {
 101         macvlan_hash_del(vlan, true);
 102         /* Now that we are unhashed it is safe to change the device
 103          * address without confusing packet delivery.
 104          */
 105         memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
 106         macvlan_hash_add(vlan);
 107 }
 108
 109 static int macvlan_addr_busy(const struct macvlan_port *port,
 110                                 const unsigned char *addr)
 111 {
 112         /* Test to see if the specified multicast address is
 113          * currently in use by the underlying device or
 114          * another macvlan.
 115          */
 116         if (ether_addr_equal_64bits(port->dev->dev_addr, addr))
 117                 return 1;
 118
 119         if (macvlan_hash_lookup(port, addr))
 120                 return 1;
 121
 122         return 0;
 123 }
 124
 125
 126 static int macvlan_broadcast_one(struct sk_buff *skb,
 127                                  const struct macvlan_dev *vlan,
 128                                  const struct ethhdr *eth, bool local)
 129 {
 130         struct net_device *dev = vlan->dev;
 131
 132         if (local)
 133                 return __dev_forward_skb(dev, skb);
 134
 135         skb->dev = dev;
 136         if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
 137                 skb->pkt_type = PACKET_BROADCAST;
 138         else
 139                 skb->pkt_type = PACKET_MULTICAST;
 140
 141         return 0;
 142 }
 143
 144 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
 145 {
 146         return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT);
 147 }
 148
 149
 150 static unsigned int mc_hash(const struct macvlan_dev *vlan,
 151                             const unsigned char *addr)
 152 {
 153         u32 val = __get_unaligned_cpu32(addr + 2);
 154
 155         val ^= macvlan_hash_mix(vlan);
 156         return hash_32(val, MACVLAN_MC_FILTER_BITS);
 157 }
 158
 159 static void macvlan_broadcast(struct sk_buff *skb,
 160                               const struct macvlan_port *port,
 161                               struct net_device *src,
 162                               enum macvlan_mode mode)
 163 {
 164         const struct ethhdr *eth = eth_hdr(skb);
 165         const struct macvlan_dev *vlan;
 166         struct sk_buff *nskb;
 167         unsigned int i;
 168         int err;
 169         unsigned int hash;
 170
 171         if (skb->protocol == htons(ETH_P_PAUSE))
 172                 return;
 173
 174         for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
 175                 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) {
 176                         if (vlan->dev == src || !(vlan->mode & mode))
 177                                 continue;
 178
 179                         hash = mc_hash(vlan, eth->h_dest);
 180                         if (!test_bit(hash, vlan->mc_filter))
 181                                 continue;
 182
 183                         err = NET_RX_DROP;
 184                         nskb = skb_clone(skb, GFP_ATOMIC);
 185                         if (likely(nskb))
 186                                 err = macvlan_broadcast_one(
 187                                         nskb, vlan, eth,
 188                                         mode == MACVLAN_MODE_BRIDGE) ?:
 189                                       netif_rx_ni(nskb);
 190                         macvlan_count_rx(vlan, skb->len + ETH_HLEN,
 191                                          err == NET_RX_SUCCESS, 1);
 192                 }
 193         }
 194 }
 195
 196 static void macvlan_process_broadcast(struct work_struct *w)
 197 {
 198         struct macvlan_port *port = container_of(w, struct macvlan_port,
 199                                                  bc_work);
 200         struct sk_buff *skb;
 201         struct sk_buff_head list;
 202
 203         skb_queue_head_init(&list);
 204
 205         spin_lock_bh(&port->bc_queue.lock);
 206         skb_queue_splice_tail_init(&port->bc_queue, &list);
 207         spin_unlock_bh(&port->bc_queue.lock);
 208
 209         while ((skb = __skb_dequeue(&list))) {
 210                 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
 211
 212                 rcu_read_lock();
 213
 214                 if (!src)
 215                         /* frame comes from an external address */
 216                         macvlan_broadcast(skb, port, NULL,
 217                                           MACVLAN_MODE_PRIVATE |
 218                                           MACVLAN_MODE_VEPA    |
 219                                           MACVLAN_MODE_PASSTHRU|
 220                                           MACVLAN_MODE_BRIDGE);
 221                 else if (src->mode == MACVLAN_MODE_VEPA)
 222                         /* flood to everyone except source */
 223                         macvlan_broadcast(skb, port, src->dev,
 224                                           MACVLAN_MODE_VEPA |
 225                                           MACVLAN_MODE_BRIDGE);
 226                 else
 227                         /*
 228                          * flood only to VEPA ports, bridge ports
 229                          * already saw the frame on the way out.
 230                          */
 231                         macvlan_broadcast(skb, port, src->dev,
 232                                           MACVLAN_MODE_VEPA);
 233
 234                 rcu_read_unlock();
 235
 236                 kfree_skb(skb);
 237         }
 238 }
 239
 240 static void macvlan_broadcast_enqueue(struct macvlan_port *port,
 241                                       struct sk_buff *skb)
 242 {
 243         struct sk_buff *nskb;
 244         int err = -ENOMEM;
 245
 246         nskb = skb_clone(skb, GFP_ATOMIC);
 247         if (!nskb)
 248                 goto err;
 249
 250         spin_lock(&port->bc_queue.lock);
 251         if (skb_queue_len(&port->bc_queue) < skb->dev->tx_queue_len) {
 252                 __skb_queue_tail(&port->bc_queue, nskb);
 253                 err = 0;
 254         }
 255         spin_unlock(&port->bc_queue.lock);
 256
 257         if (err)
 258                 goto free_nskb;
 259
 260         schedule_work(&port->bc_work);
 261         return;
 262
 263 free_nskb:
 264         kfree_skb(nskb);
 265 err:
 266         atomic_long_inc(&skb->dev->rx_dropped);
 267 }
 268
 269 /* called under rcu_read_lock() from netif_receive_skb */
 270 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
 271 {
 272         struct macvlan_port *port;
 273         struct sk_buff *skb = *pskb;
 274         const struct ethhdr *eth = eth_hdr(skb);
 275         const struct macvlan_dev *vlan;
 276         const struct macvlan_dev *src;
 277         struct net_device *dev;
 278         unsigned int len = 0;
 279         int ret = NET_RX_DROP;
 280
 281         port = macvlan_port_get_rcu(skb->dev);
 282         if (is_multicast_ether_addr(eth->h_dest)) {
 283                 skb = ip_check_defrag(skb, IP_DEFRAG_MACVLAN);
 284                 if (!skb)
 285                         return RX_HANDLER_CONSUMED;
 286                 eth = eth_hdr(skb);
 287                 src = macvlan_hash_lookup(port, eth->h_source);
 288                 if (src && src->mode != MACVLAN_MODE_VEPA &&
 289                     src->mode != MACVLAN_MODE_BRIDGE) {
 290                         /* forward to original port. */
 291                         vlan = src;
 292                         ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
 293                               netif_rx(skb);
 294                         goto out;
 295                 }
 296
 297                 MACVLAN_SKB_CB(skb)->src = src;
 298                 macvlan_broadcast_enqueue(port, skb);
 299
 300                 return RX_HANDLER_PASS;
 301         }
 302
 303         if (port->passthru)
 304                 vlan = list_first_or_null_rcu(&port->vlans,
 305                                               struct macvlan_dev, list);
 306         else
 307                 vlan = macvlan_hash_lookup(port, eth->h_dest);
 308         if (vlan == NULL)
 309                 return RX_HANDLER_PASS;
 310
 311         dev = vlan->dev;
 312         if (unlikely(!(dev->flags & IFF_UP))) {
 313                 kfree_skb(skb);
 314                 return RX_HANDLER_CONSUMED;
 315         }
 316         len = skb->len + ETH_HLEN;
 317         skb = skb_share_check(skb, GFP_ATOMIC);
 318         if (!skb)
 319                 goto out;
 320
 321         skb->dev = dev;
 322         skb->pkt_type = PACKET_HOST;
 323
 324         ret = netif_rx(skb);
 325
 326 out:
 327         macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0);
 328         return RX_HANDLER_CONSUMED;
 329 }
 330
 331 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
 332 {
 333         const struct macvlan_dev *vlan = netdev_priv(dev);
 334         const struct macvlan_port *port = vlan->port;
 335         const struct macvlan_dev *dest;
 336
 337         if (vlan->mode == MACVLAN_MODE_BRIDGE) {
 338                 const struct ethhdr *eth = (void *)skb->data;
 339
 340                 /* send to other bridge ports directly */
 341                 if (is_multicast_ether_addr(eth->h_dest)) {
 342                         macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
 343                         goto xmit_world;
 344                 }
 345
 346                 dest = macvlan_hash_lookup(port, eth->h_dest);
 347                 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
 348                         /* send to lowerdev first for its network taps */
 349                         dev_forward_skb(vlan->lowerdev, skb);
 350
 351                         return NET_XMIT_SUCCESS;
 352                 }
 353         }
 354
 355 xmit_world:
 356         skb->dev = vlan->lowerdev;
 357         return dev_queue_xmit(skb);
 358 }
 359
 360 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
 361 {
 362 #ifdef CONFIG_NET_POLL_CONTROLLER
 363         if (vlan->netpoll)
 364                 netpoll_send_skb(vlan->netpoll, skb);
 365 #else
 366         BUG();
 367 #endif
 368         return NETDEV_TX_OK;
 369 }
 370
 371 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
 372                                       struct net_device *dev)
 373 {
 374         unsigned int len = skb->len;
 375         int ret;
 376         struct macvlan_dev *vlan = netdev_priv(dev);
 377
 378         if (unlikely(netpoll_tx_running(dev)))
 379                 return macvlan_netpoll_send_skb(vlan, skb);
 380
 381         if (vlan->fwd_priv) {
 382                 skb->dev = vlan->lowerdev;
 383                 ret = dev_queue_xmit_accel(skb, vlan->fwd_priv);
 384         } else {
 385                 ret = macvlan_queue_xmit(skb, dev);
 386         }
 387
 388         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 389                 struct vlan_pcpu_stats *pcpu_stats;
 390
 391                 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
 392                 u64_stats_update_begin(&pcpu_stats->syncp);
 393                 pcpu_stats->tx_packets++;
 394                 pcpu_stats->tx_bytes += len;
 395                 u64_stats_update_end(&pcpu_stats->syncp);
 396         } else {
 397                 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
 398         }
 399         return ret;
 400 }
 401
 402 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
 403                                unsigned short type, const void *daddr,
 404                                const void *saddr, unsigned len)
 405 {
 406         const struct macvlan_dev *vlan = netdev_priv(dev);
 407         struct net_device *lowerdev = vlan->lowerdev;
 408
 409         return dev_hard_header(skb, lowerdev, type, daddr,
 410                                saddr ? : dev->dev_addr, len);
 411 }
 412
 413 static const struct header_ops macvlan_hard_header_ops = {
 414         .create         = macvlan_hard_header,
 415         .rebuild        = eth_rebuild_header,
 416         .parse          = eth_header_parse,
 417         .cache          = eth_header_cache,
 418         .cache_update   = eth_header_cache_update,
 419 };
 420
 421 static struct rtnl_link_ops macvlan_link_ops;
 422
 423 static int macvlan_open(struct net_device *dev)
 424 {
 425         struct macvlan_dev *vlan = netdev_priv(dev);
 426         struct net_device *lowerdev = vlan->lowerdev;
 427         int err;
 428
 429         if (vlan->port->passthru) {
 430                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
 431                         err = dev_set_promiscuity(lowerdev, 1);
 432                         if (err < 0)
 433                                 goto out;
 434                 }
 435                 goto hash_add;
 436         }
 437
 438         if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD &&
 439             dev->rtnl_link_ops == &macvlan_link_ops) {
 440                 vlan->fwd_priv =
 441                       lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
 442
 443                 /* If we get a NULL pointer back, or if we get an error
 444                  * then we should just fall through to the non accelerated path
 445                  */
 446                 if (IS_ERR_OR_NULL(vlan->fwd_priv)) {
 447                         vlan->fwd_priv = NULL;
 448                 } else
 449                         return 0;
 450         }
 451
 452         err = -EBUSY;
 453         if (macvlan_addr_busy(vlan->port, dev->dev_addr))
 454                 goto out;
 455
 456         err = dev_uc_add(lowerdev, dev->dev_addr);
 457         if (err < 0)
 458                 goto out;
 459         if (dev->flags & IFF_ALLMULTI) {
 460                 err = dev_set_allmulti(lowerdev, 1);
 461                 if (err < 0)
 462                         goto del_unicast;
 463         }
 464
 465 hash_add:
 466         macvlan_hash_add(vlan);
 467         return 0;
 468
 469 del_unicast:
 470         dev_uc_del(lowerdev, dev->dev_addr);
 471 out:
 472         if (vlan->fwd_priv) {
 473                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
 474                                                            vlan->fwd_priv);
 475                 vlan->fwd_priv = NULL;
 476         }
 477         return err;
 478 }
 479
 480 static int macvlan_stop(struct net_device *dev)
 481 {
 482         struct macvlan_dev *vlan = netdev_priv(dev);
 483         struct net_device *lowerdev = vlan->lowerdev;
 484
 485         if (vlan->fwd_priv) {
 486                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
 487                                                            vlan->fwd_priv);
 488                 vlan->fwd_priv = NULL;
 489                 return 0;
 490         }
 491
 492         dev_uc_unsync(lowerdev, dev);
 493         dev_mc_unsync(lowerdev, dev);
 494
 495         if (vlan->port->passthru) {
 496                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
 497                         dev_set_promiscuity(lowerdev, -1);
 498                 goto hash_del;
 499         }
 500
 501         if (dev->flags & IFF_ALLMULTI)
 502                 dev_set_allmulti(lowerdev, -1);
 503
 504         dev_uc_del(lowerdev, dev->dev_addr);
 505
 506 hash_del:
 507         macvlan_hash_del(vlan, !dev->dismantle);
 508         return 0;
 509 }
 510
 511 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
 512 {
 513         struct macvlan_dev *vlan = netdev_priv(dev);
 514         struct net_device *lowerdev = vlan->lowerdev;
 515         int err;
 516
 517         if (!(dev->flags & IFF_UP)) {
 518                 /* Just copy in the new address */
 519                 ether_addr_copy(dev->dev_addr, addr);
 520         } else {
 521                 /* Rehash and update the device filters */
 522                 if (macvlan_addr_busy(vlan->port, addr))
 523                         return -EBUSY;
 524
 525                 if (!vlan->port->passthru) {
 526                         err = dev_uc_add(lowerdev, addr);
 527                         if (err)
 528                                 return err;
 529
 530                         dev_uc_del(lowerdev, dev->dev_addr);
 531                 }
 532
 533                 macvlan_hash_change_addr(vlan, addr);
 534         }
 535         return 0;
 536 }
 537
 538 static int macvlan_set_mac_address(struct net_device *dev, void *p)
 539 {
 540         struct macvlan_dev *vlan = netdev_priv(dev);
 541         struct sockaddr *addr = p;
 542
 543         if (!is_valid_ether_addr(addr->sa_data))
 544                 return -EADDRNOTAVAIL;
 545
 546         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
 547                 dev_set_mac_address(vlan->lowerdev, addr);
 548                 return 0;
 549         }
 550
 551         return macvlan_sync_address(dev, addr->sa_data);
 552 }
 553
 554 static void macvlan_change_rx_flags(struct net_device *dev, int change)
 555 {
 556         struct macvlan_dev *vlan = netdev_priv(dev);
 557         struct net_device *lowerdev = vlan->lowerdev;
 558
 559         if (dev->flags & IFF_UP) {
 560                 if (change & IFF_ALLMULTI)
 561                         dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 562         }
 563 }
 564
 565 static void macvlan_set_mac_lists(struct net_device *dev)
 566 {
 567         struct macvlan_dev *vlan = netdev_priv(dev);
 568
 569         if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
 570                 bitmap_fill(vlan->mc_filter, MACVLAN_MC_FILTER_SZ);
 571         } else {
 572                 struct netdev_hw_addr *ha;
 573                 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
 574
 575                 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
 576                 netdev_for_each_mc_addr(ha, dev) {
 577                         __set_bit(mc_hash(vlan, ha->addr), filter);
 578                 }
 579
 580                 __set_bit(mc_hash(vlan, dev->broadcast), filter);
 581
 582                 bitmap_copy(vlan->mc_filter, filter, MACVLAN_MC_FILTER_SZ);
 583         }
 584         dev_uc_sync(vlan->lowerdev, dev);
 585         dev_mc_sync(vlan->lowerdev, dev);
 586 }
 587
 588 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
 589 {
 590         struct macvlan_dev *vlan = netdev_priv(dev);
 591
 592         if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
 593                 return -EINVAL;
 594         dev->mtu = new_mtu;
 595         return 0;
 596 }
 597
 598 /*
 599  * macvlan network devices have devices nesting below it and are a special
 600  * "super class" of normal network devices; split their locks off into a
 601  * separate class since they always nest.
 602  */
 603 static struct lock_class_key macvlan_netdev_xmit_lock_key;
 604 static struct lock_class_key macvlan_netdev_addr_lock_key;
 605
 606 #define ALWAYS_ON_FEATURES \
 607         (NETIF_F_SG | NETIF_F_GEN_CSUM | NETIF_F_GSO_SOFTWARE | NETIF_F_LLTX)
 608
 609 #define MACVLAN_FEATURES \
 610         (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
 611          NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
 612          NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
 613          NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
 614
 615 #define MACVLAN_STATE_MASK \
 616         ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
 617
 618 static int macvlan_get_nest_level(struct net_device *dev)
 619 {
 620         return ((struct macvlan_dev *)netdev_priv(dev))->nest_level;
 621 }
 622
 623 static void macvlan_set_lockdep_class_one(struct net_device *dev,
 624                                           struct netdev_queue *txq,
 625                                           void *_unused)
 626 {
 627         lockdep_set_class(&txq->_xmit_lock,
 628                           &macvlan_netdev_xmit_lock_key);
 629 }
 630
 631 static void macvlan_set_lockdep_class(struct net_device *dev)
 632 {
 633         lockdep_set_class_and_subclass(&dev->addr_list_lock,
 634                                        &macvlan_netdev_addr_lock_key,
 635                                        macvlan_get_nest_level(dev));
 636         netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
 637 }
 638
 639 static int macvlan_init(struct net_device *dev)
 640 {
 641         struct macvlan_dev *vlan = netdev_priv(dev);
 642         const struct net_device *lowerdev = vlan->lowerdev;
 643
 644         dev->state              = (dev->state & ~MACVLAN_STATE_MASK) |
 645                                   (lowerdev->state & MACVLAN_STATE_MASK);
 646         dev->features           = lowerdev->features & MACVLAN_FEATURES;
 647         dev->features           |= ALWAYS_ON_FEATURES;
 648         dev->vlan_features      = lowerdev->vlan_features & MACVLAN_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         port->count -= 1;
 670         if (!port->count)
 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         /* Support unicast filter only on passthru devices.
 743          * Multicast filter should be allowed on all devices.
 744          */
 745         if (!vlan->port->passthru && is_unicast_ether_addr(addr))
 746                 return -EOPNOTSUPP;
 747
 748         if (flags & NLM_F_REPLACE)
 749                 return -EOPNOTSUPP;
 750
 751         if (is_unicast_ether_addr(addr))
 752                 err = dev_uc_add_excl(dev, addr);
 753         else if (is_multicast_ether_addr(addr))
 754                 err = dev_mc_add_excl(dev, addr);
 755
 756         return err;
 757 }
 758
 759 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
 760                            struct net_device *dev,
 761                            const unsigned char *addr)
 762 {
 763         struct macvlan_dev *vlan = netdev_priv(dev);
 764         int err = -EINVAL;
 765
 766         /* Support unicast filter only on passthru devices.
 767          * Multicast filter should be allowed on all devices.
 768          */
 769         if (!vlan->port->passthru && is_unicast_ether_addr(addr))
 770                 return -EOPNOTSUPP;
 771
 772         if (is_unicast_ether_addr(addr))
 773                 err = dev_uc_del(dev, addr);
 774         else if (is_multicast_ether_addr(addr))
 775                 err = dev_mc_del(dev, addr);
 776
 777         return err;
 778 }
 779
 780 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
 781                                         struct ethtool_drvinfo *drvinfo)
 782 {
 783         strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
 784         strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
 785 }
 786
 787 static int macvlan_ethtool_get_settings(struct net_device *dev,
 788                                         struct ethtool_cmd *cmd)
 789 {
 790         const struct macvlan_dev *vlan = netdev_priv(dev);
 791
 792         return __ethtool_get_settings(vlan->lowerdev, cmd);
 793 }
 794
 795 static netdev_features_t macvlan_fix_features(struct net_device *dev,
 796                                               netdev_features_t features)
 797 {
 798         struct macvlan_dev *vlan = netdev_priv(dev);
 799         netdev_features_t mask;
 800
 801         features |= NETIF_F_ALL_FOR_ALL;
 802         features &= (vlan->set_features | ~MACVLAN_FEATURES);
 803         mask = features;
 804
 805         features = netdev_increment_features(vlan->lowerdev->features,
 806                                              features,
 807                                              mask);
 808         features |= ALWAYS_ON_FEATURES;
 809
 810         return features;
 811 }
 812
 813 #ifdef CONFIG_NET_POLL_CONTROLLER
 814 static void macvlan_dev_poll_controller(struct net_device *dev)
 815 {
 816         return;
 817 }
 818
 819 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
 820 {
 821         struct macvlan_dev *vlan = netdev_priv(dev);
 822         struct net_device *real_dev = vlan->lowerdev;
 823         struct netpoll *netpoll;
 824         int err = 0;
 825
 826         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 827         err = -ENOMEM;
 828         if (!netpoll)
 829                 goto out;
 830
 831         err = __netpoll_setup(netpoll, real_dev);
 832         if (err) {
 833                 kfree(netpoll);
 834                 goto out;
 835         }
 836
 837         vlan->netpoll = netpoll;
 838
 839 out:
 840         return err;
 841 }
 842
 843 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
 844 {
 845         struct macvlan_dev *vlan = netdev_priv(dev);
 846         struct netpoll *netpoll = vlan->netpoll;
 847
 848         if (!netpoll)
 849                 return;
 850
 851         vlan->netpoll = NULL;
 852
 853         __netpoll_free_async(netpoll);
 854 }
 855 #endif  /* CONFIG_NET_POLL_CONTROLLER */
 856
 857 static const struct ethtool_ops macvlan_ethtool_ops = {
 858         .get_link               = ethtool_op_get_link,
 859         .get_settings           = macvlan_ethtool_get_settings,
 860         .get_drvinfo            = macvlan_ethtool_get_drvinfo,
 861 };
 862
 863 static const struct net_device_ops macvlan_netdev_ops = {
 864         .ndo_init               = macvlan_init,
 865         .ndo_uninit             = macvlan_uninit,
 866         .ndo_open               = macvlan_open,
 867         .ndo_stop               = macvlan_stop,
 868         .ndo_start_xmit         = macvlan_start_xmit,
 869         .ndo_change_mtu         = macvlan_change_mtu,
 870         .ndo_fix_features       = macvlan_fix_features,
 871         .ndo_change_rx_flags    = macvlan_change_rx_flags,
 872         .ndo_set_mac_address    = macvlan_set_mac_address,
 873         .ndo_set_rx_mode        = macvlan_set_mac_lists,
 874         .ndo_get_stats64        = macvlan_dev_get_stats64,
 875         .ndo_validate_addr      = eth_validate_addr,
 876         .ndo_vlan_rx_add_vid    = macvlan_vlan_rx_add_vid,
 877         .ndo_vlan_rx_kill_vid   = macvlan_vlan_rx_kill_vid,
 878         .ndo_fdb_add            = macvlan_fdb_add,
 879         .ndo_fdb_del            = macvlan_fdb_del,
 880         .ndo_fdb_dump           = ndo_dflt_fdb_dump,
 881         .ndo_get_lock_subclass  = macvlan_get_nest_level,
 882 #ifdef CONFIG_NET_POLL_CONTROLLER
 883         .ndo_poll_controller    = macvlan_dev_poll_controller,
 884         .ndo_netpoll_setup      = macvlan_dev_netpoll_setup,
 885         .ndo_netpoll_cleanup    = macvlan_dev_netpoll_cleanup,
 886 #endif
 887 };
 888
 889 void macvlan_common_setup(struct net_device *dev)
 890 {
 891         ether_setup(dev);
 892
 893         dev->priv_flags        &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
 894         dev->priv_flags        |= IFF_UNICAST_FLT;
 895         dev->netdev_ops         = &macvlan_netdev_ops;
 896         dev->destructor         = free_netdev;
 897         dev->header_ops         = &macvlan_hard_header_ops;
 898         dev->ethtool_ops        = &macvlan_ethtool_ops;
 899 }
 900 EXPORT_SYMBOL_GPL(macvlan_common_setup);
 901
 902 static void macvlan_setup(struct net_device *dev)
 903 {
 904         macvlan_common_setup(dev);
 905         dev->tx_queue_len       = 0;
 906 }
 907
 908 static int macvlan_port_create(struct net_device *dev)
 909 {
 910         struct macvlan_port *port;
 911         unsigned int i;
 912         int err;
 913
 914         if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
 915                 return -EINVAL;
 916
 917         port = kzalloc(sizeof(*port), GFP_KERNEL);
 918         if (port == NULL)
 919                 return -ENOMEM;
 920
 921         port->passthru = false;
 922         port->dev = dev;
 923         INIT_LIST_HEAD(&port->vlans);
 924         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
 925                 INIT_HLIST_HEAD(&port->vlan_hash[i]);
 926
 927         skb_queue_head_init(&port->bc_queue);
 928         INIT_WORK(&port->bc_work, macvlan_process_broadcast);
 929
 930         err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
 931         if (err)
 932                 kfree(port);
 933         else
 934                 dev->priv_flags |= IFF_MACVLAN_PORT;
 935         return err;
 936 }
 937
 938 static void macvlan_port_destroy(struct net_device *dev)
 939 {
 940         struct macvlan_port *port = macvlan_port_get_rtnl(dev);
 941
 942         cancel_work_sync(&port->bc_work);
 943         dev->priv_flags &= ~IFF_MACVLAN_PORT;
 944         netdev_rx_handler_unregister(dev);
 945         kfree_rcu(port, rcu);
 946 }
 947
 948 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
 949 {
 950         if (tb[IFLA_ADDRESS]) {
 951                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
 952                         return -EINVAL;
 953                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
 954                         return -EADDRNOTAVAIL;
 955         }
 956
 957         if (data && data[IFLA_MACVLAN_FLAGS] &&
 958             nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
 959                 return -EINVAL;
 960
 961         if (data && data[IFLA_MACVLAN_MODE]) {
 962                 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
 963                 case MACVLAN_MODE_PRIVATE:
 964                 case MACVLAN_MODE_VEPA:
 965                 case MACVLAN_MODE_BRIDGE:
 966                 case MACVLAN_MODE_PASSTHRU:
 967                         break;
 968                 default:
 969                         return -EINVAL;
 970                 }
 971         }
 972         return 0;
 973 }
 974
 975 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
 976                            struct nlattr *tb[], struct nlattr *data[])
 977 {
 978         struct macvlan_dev *vlan = netdev_priv(dev);
 979         struct macvlan_port *port;
 980         struct net_device *lowerdev;
 981         int err;
 982
 983         if (!tb[IFLA_LINK])
 984                 return -EINVAL;
 985
 986         lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
 987         if (lowerdev == NULL)
 988                 return -ENODEV;
 989
 990         /* When creating macvlans or macvtaps on top of other macvlans - use
 991          * the real device as the lowerdev.
 992          */
 993         if (netif_is_macvlan(lowerdev))
 994                 lowerdev = macvlan_dev_real_dev(lowerdev);
 995
 996         if (!tb[IFLA_MTU])
 997                 dev->mtu = lowerdev->mtu;
 998         else if (dev->mtu > lowerdev->mtu)
 999                 return -EINVAL;
1000
1001         if (!tb[IFLA_ADDRESS])
1002                 eth_hw_addr_random(dev);
1003
1004         if (!macvlan_port_exists(lowerdev)) {
1005                 err = macvlan_port_create(lowerdev);
1006                 if (err < 0)
1007                         return err;
1008         }
1009         port = macvlan_port_get_rtnl(lowerdev);
1010
1011         /* Only 1 macvlan device can be created in passthru mode */
1012         if (port->passthru)
1013                 return -EINVAL;
1014
1015         vlan->lowerdev = lowerdev;
1016         vlan->dev      = dev;
1017         vlan->port     = port;
1018         vlan->set_features = MACVLAN_FEATURES;
1019         vlan->nest_level = dev_get_nest_level(lowerdev, netif_is_macvlan) + 1;
1020
1021         vlan->mode     = MACVLAN_MODE_VEPA;
1022         if (data && data[IFLA_MACVLAN_MODE])
1023                 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1024
1025         if (data && data[IFLA_MACVLAN_FLAGS])
1026                 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1027
1028         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1029                 if (port->count)
1030                         return -EINVAL;
1031                 port->passthru = true;
1032                 eth_hw_addr_inherit(dev, lowerdev);
1033         }
1034
1035         port->count += 1;
1036         err = register_netdevice(dev);
1037         if (err < 0)
1038                 goto destroy_port;
1039
1040         dev->priv_flags |= IFF_MACVLAN;
1041         err = netdev_upper_dev_link(lowerdev, dev);
1042         if (err)
1043                 goto unregister_netdev;
1044
1045         list_add_tail_rcu(&vlan->list, &port->vlans);
1046         netif_stacked_transfer_operstate(lowerdev, dev);
1047
1048         return 0;
1049
1050 unregister_netdev:
1051         unregister_netdevice(dev);
1052 destroy_port:
1053         port->count -= 1;
1054         if (!port->count)
1055                 macvlan_port_destroy(lowerdev);
1056
1057         return err;
1058 }
1059 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1060
1061 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1062                            struct nlattr *tb[], struct nlattr *data[])
1063 {
1064         return macvlan_common_newlink(src_net, dev, tb, data);
1065 }
1066
1067 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1068 {
1069         struct macvlan_dev *vlan = netdev_priv(dev);
1070
1071         list_del_rcu(&vlan->list);
1072         unregister_netdevice_queue(dev, head);
1073         netdev_upper_dev_unlink(vlan->lowerdev, dev);
1074 }
1075 EXPORT_SYMBOL_GPL(macvlan_dellink);
1076
1077 static int macvlan_changelink(struct net_device *dev,
1078                 struct nlattr *tb[], struct nlattr *data[])
1079 {
1080         struct macvlan_dev *vlan = netdev_priv(dev);
1081         enum macvlan_mode mode;
1082         bool set_mode = false;
1083
1084         /* Validate mode, but don't set yet: setting flags may fail. */
1085         if (data && data[IFLA_MACVLAN_MODE]) {
1086                 set_mode = true;
1087                 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1088                 /* Passthrough mode can't be set or cleared dynamically */
1089                 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1090                     (vlan->mode == MACVLAN_MODE_PASSTHRU))
1091                         return -EINVAL;
1092         }
1093
1094         if (data && data[IFLA_MACVLAN_FLAGS]) {
1095                 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1096                 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1097                 if (vlan->port->passthru && promisc) {
1098                         int err;
1099
1100                         if (flags & MACVLAN_FLAG_NOPROMISC)
1101                                 err = dev_set_promiscuity(vlan->lowerdev, -1);
1102                         else
1103                                 err = dev_set_promiscuity(vlan->lowerdev, 1);
1104                         if (err < 0)
1105                                 return err;
1106                 }
1107                 vlan->flags = flags;
1108         }
1109         if (set_mode)
1110                 vlan->mode = mode;
1111         return 0;
1112 }
1113
1114 static size_t macvlan_get_size(const struct net_device *dev)
1115 {
1116         return (0
1117                 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1118                 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1119                 );
1120 }
1121
1122 static int macvlan_fill_info(struct sk_buff *skb,
1123                                 const struct net_device *dev)
1124 {
1125         struct macvlan_dev *vlan = netdev_priv(dev);
1126
1127         if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1128                 goto nla_put_failure;
1129         if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1130                 goto nla_put_failure;
1131         return 0;
1132
1133 nla_put_failure:
1134         return -EMSGSIZE;
1135 }
1136
1137 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1138         [IFLA_MACVLAN_MODE]  = { .type = NLA_U32 },
1139         [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1140 };
1141
1142 int macvlan_link_register(struct rtnl_link_ops *ops)
1143 {
1144         /* common fields */
1145         ops->priv_size          = sizeof(struct macvlan_dev);
1146         ops->validate           = macvlan_validate;
1147         ops->maxtype            = IFLA_MACVLAN_MAX;
1148         ops->policy             = macvlan_policy;
1149         ops->changelink         = macvlan_changelink;
1150         ops->get_size           = macvlan_get_size;
1151         ops->fill_info          = macvlan_fill_info;
1152
1153         return rtnl_link_register(ops);
1154 };
1155 EXPORT_SYMBOL_GPL(macvlan_link_register);
1156
1157 static struct rtnl_link_ops macvlan_link_ops = {
1158         .kind           = "macvlan",
1159         .setup          = macvlan_setup,
1160         .newlink        = macvlan_newlink,
1161         .dellink        = macvlan_dellink,
1162 };
1163
1164 static int macvlan_device_event(struct notifier_block *unused,
1165                                 unsigned long event, void *ptr)
1166 {
1167         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1168         struct macvlan_dev *vlan, *next;
1169         struct macvlan_port *port;
1170         LIST_HEAD(list_kill);
1171
1172         if (!macvlan_port_exists(dev))
1173                 return NOTIFY_DONE;
1174
1175         port = macvlan_port_get_rtnl(dev);
1176
1177         switch (event) {
1178         case NETDEV_CHANGE:
1179                 list_for_each_entry(vlan, &port->vlans, list)
1180                         netif_stacked_transfer_operstate(vlan->lowerdev,
1181                                                          vlan->dev);
1182                 break;
1183         case NETDEV_FEAT_CHANGE:
1184                 list_for_each_entry(vlan, &port->vlans, list) {
1185                         vlan->dev->gso_max_size = dev->gso_max_size;
1186                         netdev_update_features(vlan->dev);
1187                 }
1188                 break;
1189         case NETDEV_CHANGEMTU:
1190                 list_for_each_entry(vlan, &port->vlans, list) {
1191                         if (vlan->dev->mtu <= dev->mtu)
1192                                 continue;
1193                         dev_set_mtu(vlan->dev, dev->mtu);
1194                 }
1195                 break;
1196         case NETDEV_CHANGEADDR:
1197                 if (!port->passthru)
1198                         return NOTIFY_DONE;
1199
1200                 vlan = list_first_entry_or_null(&port->vlans,
1201                                                 struct macvlan_dev,
1202                                                 list);
1203
1204                 if (macvlan_sync_address(vlan->dev, dev->dev_addr))
1205                         return NOTIFY_BAD;
1206
1207                 break;
1208         case NETDEV_UNREGISTER:
1209                 /* twiddle thumbs on netns device moves */
1210                 if (dev->reg_state != NETREG_UNREGISTERING)
1211                         break;
1212
1213                 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1214                         vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1215                 unregister_netdevice_many(&list_kill);
1216                 break;
1217         case NETDEV_PRE_TYPE_CHANGE:
1218                 /* Forbid underlaying device to change its type. */
1219                 return NOTIFY_BAD;
1220
1221         case NETDEV_NOTIFY_PEERS:
1222         case NETDEV_BONDING_FAILOVER:
1223         case NETDEV_RESEND_IGMP:
1224                 /* Propagate to all vlans */
1225                 list_for_each_entry(vlan, &port->vlans, list)
1226                         call_netdevice_notifiers(event, vlan->dev);
1227         }
1228         return NOTIFY_DONE;
1229 }
1230
1231 static struct notifier_block macvlan_notifier_block __read_mostly = {
1232         .notifier_call  = macvlan_device_event,
1233 };
1234
1235 static int __init macvlan_init_module(void)
1236 {
1237         int err;
1238
1239         register_netdevice_notifier(&macvlan_notifier_block);
1240
1241         err = macvlan_link_register(&macvlan_link_ops);
1242         if (err < 0)
1243                 goto err1;
1244         return 0;
1245 err1:
1246         unregister_netdevice_notifier(&macvlan_notifier_block);
1247         return err;
1248 }
1249
1250 static void __exit macvlan_cleanup_module(void)
1251 {
1252         rtnl_link_unregister(&macvlan_link_ops);
1253         unregister_netdevice_notifier(&macvlan_notifier_block);
1254 }
1255
1256 module_init(macvlan_init_module);
1257 module_exit(macvlan_cleanup_module);
1258
1259 MODULE_LICENSE("GPL");
1260 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1261 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1262 MODULE_ALIAS_RTNL_LINK("macvlan");