drivers/net/macvlan.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (c) 2007 Patrick McHardy <kaber@trash.net>
   4  *
   5  * The code this is based on carried the following copyright notice:
   6  * ---
   7  * (C) Copyright 2001-2006
   8  * Alex Zeffertt, Cambridge Broadband Ltd, ajz@cambridgebroadband.com
   9  * Re-worked by Ben Greear <greearb@candelatech.com>
  10  * ---
  11  */
  12 #include <linux/kernel.h>
  13 #include <linux/types.h>
  14 #include <linux/module.h>
  15 #include <linux/init.h>
  16 #include <linux/errno.h>
  17 #include <linux/slab.h>
  18 #include <linux/string.h>
  19 #include <linux/rculist.h>
  20 #include <linux/notifier.h>
  21 #include <linux/netdevice.h>
  22 #include <linux/etherdevice.h>
  23 #include <linux/net_tstamp.h>
  24 #include <linux/ethtool.h>
  25 #include <linux/if_arp.h>
  26 #include <linux/if_vlan.h>
  27 #include <linux/if_link.h>
  28 #include <linux/if_macvlan.h>
  29 #include <linux/hash.h>
  30 #include <linux/workqueue.h>
  31 #include <net/rtnetlink.h>
  32 #include <net/xfrm.h>
  33 #include <linux/netpoll.h>
  34 #include <linux/phy.h>
  35
  36 #define MACVLAN_HASH_BITS       8
  37 #define MACVLAN_HASH_SIZE       (1<<MACVLAN_HASH_BITS)
  38 #define MACVLAN_DEFAULT_BC_QUEUE_LEN    1000
  39
  40 #define MACVLAN_F_PASSTHRU      1
  41 #define MACVLAN_F_ADDRCHANGE    2
  42
  43 struct macvlan_port {
  44         struct net_device       *dev;
  45         struct hlist_head       vlan_hash[MACVLAN_HASH_SIZE];
  46         struct list_head        vlans;
  47         struct sk_buff_head     bc_queue;
  48         struct work_struct      bc_work;
  49         u32                     bc_queue_len_used;
  50         u32                     flags;
  51         int                     count;
  52         struct hlist_head       vlan_source_hash[MACVLAN_HASH_SIZE];
  53         DECLARE_BITMAP(mc_filter, MACVLAN_MC_FILTER_SZ);
  54         unsigned char           perm_addr[ETH_ALEN];
  55 };
  56
  57 struct macvlan_source_entry {
  58         struct hlist_node       hlist;
  59         struct macvlan_dev      *vlan;
  60         unsigned char           addr[6+2] __aligned(sizeof(u16));
  61         struct rcu_head         rcu;
  62 };
  63
  64 struct macvlan_skb_cb {
  65         const struct macvlan_dev *src;
  66 };
  67
  68 #define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0]))
  69
  70 static void macvlan_port_destroy(struct net_device *dev);
  71 static void update_port_bc_queue_len(struct macvlan_port *port);
  72
  73 static inline bool macvlan_passthru(const struct macvlan_port *port)
  74 {
  75         return port->flags & MACVLAN_F_PASSTHRU;
  76 }
  77
  78 static inline void macvlan_set_passthru(struct macvlan_port *port)
  79 {
  80         port->flags |= MACVLAN_F_PASSTHRU;
  81 }
  82
  83 static inline bool macvlan_addr_change(const struct macvlan_port *port)
  84 {
  85         return port->flags & MACVLAN_F_ADDRCHANGE;
  86 }
  87
  88 static inline void macvlan_set_addr_change(struct macvlan_port *port)
  89 {
  90         port->flags |= MACVLAN_F_ADDRCHANGE;
  91 }
  92
  93 static inline void macvlan_clear_addr_change(struct macvlan_port *port)
  94 {
  95         port->flags &= ~MACVLAN_F_ADDRCHANGE;
  96 }
  97
  98 /* Hash Ethernet address */
  99 static u32 macvlan_eth_hash(const unsigned char *addr)
 100 {
 101         u64 value = get_unaligned((u64 *)addr);
 102
 103         /* only want 6 bytes */
 104 #ifdef __BIG_ENDIAN
 105         value >>= 16;
 106 #else
 107         value <<= 16;
 108 #endif
 109         return hash_64(value, MACVLAN_HASH_BITS);
 110 }
 111
 112 static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev)
 113 {
 114         return rcu_dereference(dev->rx_handler_data);
 115 }
 116
 117 static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev)
 118 {
 119         return rtnl_dereference(dev->rx_handler_data);
 120 }
 121
 122 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
 123                                                const unsigned char *addr)
 124 {
 125         struct macvlan_dev *vlan;
 126         u32 idx = macvlan_eth_hash(addr);
 127
 128         hlist_for_each_entry_rcu(vlan, &port->vlan_hash[idx], hlist,
 129                                  lockdep_rtnl_is_held()) {
 130                 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr))
 131                         return vlan;
 132         }
 133         return NULL;
 134 }
 135
 136 static struct macvlan_source_entry *macvlan_hash_lookup_source(
 137         const struct macvlan_dev *vlan,
 138         const unsigned char *addr)
 139 {
 140         struct macvlan_source_entry *entry;
 141         u32 idx = macvlan_eth_hash(addr);
 142         struct hlist_head *h = &vlan->port->vlan_source_hash[idx];
 143
 144         hlist_for_each_entry_rcu(entry, h, hlist) {
 145                 if (ether_addr_equal_64bits(entry->addr, addr) &&
 146                     entry->vlan == vlan)
 147                         return entry;
 148         }
 149         return NULL;
 150 }
 151
 152 static int macvlan_hash_add_source(struct macvlan_dev *vlan,
 153                                    const unsigned char *addr)
 154 {
 155         struct macvlan_port *port = vlan->port;
 156         struct macvlan_source_entry *entry;
 157         struct hlist_head *h;
 158
 159         entry = macvlan_hash_lookup_source(vlan, addr);
 160         if (entry)
 161                 return 0;
 162
 163         entry = kmalloc(sizeof(*entry), GFP_KERNEL);
 164         if (!entry)
 165                 return -ENOMEM;
 166
 167         ether_addr_copy(entry->addr, addr);
 168         entry->vlan = vlan;
 169         h = &port->vlan_source_hash[macvlan_eth_hash(addr)];
 170         hlist_add_head_rcu(&entry->hlist, h);
 171         vlan->macaddr_count++;
 172
 173         return 0;
 174 }
 175
 176 static void macvlan_hash_add(struct macvlan_dev *vlan)
 177 {
 178         struct macvlan_port *port = vlan->port;
 179         const unsigned char *addr = vlan->dev->dev_addr;
 180         u32 idx = macvlan_eth_hash(addr);
 181
 182         hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[idx]);
 183 }
 184
 185 static void macvlan_hash_del_source(struct macvlan_source_entry *entry)
 186 {
 187         hlist_del_rcu(&entry->hlist);
 188         kfree_rcu(entry, rcu);
 189 }
 190
 191 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
 192 {
 193         hlist_del_rcu(&vlan->hlist);
 194         if (sync)
 195                 synchronize_rcu();
 196 }
 197
 198 static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
 199                                         const unsigned char *addr)
 200 {
 201         macvlan_hash_del(vlan, true);
 202         /* Now that we are unhashed it is safe to change the device
 203          * address without confusing packet delivery.
 204          */
 205         eth_hw_addr_set(vlan->dev, addr);
 206         macvlan_hash_add(vlan);
 207 }
 208
 209 static bool macvlan_addr_busy(const struct macvlan_port *port,
 210                               const unsigned char *addr)
 211 {
 212         /* Test to see if the specified address is
 213          * currently in use by the underlying device or
 214          * another macvlan.
 215          */
 216         if (!macvlan_passthru(port) && !macvlan_addr_change(port) &&
 217             ether_addr_equal_64bits(port->dev->dev_addr, addr))
 218                 return true;
 219
 220         if (macvlan_hash_lookup(port, addr))
 221                 return true;
 222
 223         return false;
 224 }
 225
 226
 227 static int macvlan_broadcast_one(struct sk_buff *skb,
 228                                  const struct macvlan_dev *vlan,
 229                                  const struct ethhdr *eth, bool local)
 230 {
 231         struct net_device *dev = vlan->dev;
 232
 233         if (local)
 234                 return __dev_forward_skb(dev, skb);
 235
 236         skb->dev = dev;
 237         if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
 238                 skb->pkt_type = PACKET_BROADCAST;
 239         else
 240                 skb->pkt_type = PACKET_MULTICAST;
 241
 242         return 0;
 243 }
 244
 245 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
 246 {
 247         return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT);
 248 }
 249
 250
 251 static unsigned int mc_hash(const struct macvlan_dev *vlan,
 252                             const unsigned char *addr)
 253 {
 254         u32 val = __get_unaligned_cpu32(addr + 2);
 255
 256         val ^= macvlan_hash_mix(vlan);
 257         return hash_32(val, MACVLAN_MC_FILTER_BITS);
 258 }
 259
 260 static void macvlan_broadcast(struct sk_buff *skb,
 261                               const struct macvlan_port *port,
 262                               struct net_device *src,
 263                               enum macvlan_mode mode)
 264 {
 265         const struct ethhdr *eth = eth_hdr(skb);
 266         const struct macvlan_dev *vlan;
 267         struct sk_buff *nskb;
 268         unsigned int i;
 269         int err;
 270         unsigned int hash;
 271
 272         if (skb->protocol == htons(ETH_P_PAUSE))
 273                 return;
 274
 275         hash_for_each_rcu(port->vlan_hash, i, vlan, hlist) {
 276                 if (vlan->dev == src || !(vlan->mode & mode))
 277                         continue;
 278
 279                 hash = mc_hash(vlan, eth->h_dest);
 280                 if (!test_bit(hash, vlan->mc_filter))
 281                         continue;
 282
 283                 err = NET_RX_DROP;
 284                 nskb = skb_clone(skb, GFP_ATOMIC);
 285                 if (likely(nskb))
 286                         err = macvlan_broadcast_one(nskb, vlan, eth,
 287                                         mode == MACVLAN_MODE_BRIDGE) ?:
 288                               netif_rx(nskb);
 289                 macvlan_count_rx(vlan, skb->len + ETH_HLEN,
 290                                  err == NET_RX_SUCCESS, true);
 291         }
 292 }
 293
 294 static void macvlan_process_broadcast(struct work_struct *w)
 295 {
 296         struct macvlan_port *port = container_of(w, struct macvlan_port,
 297                                                  bc_work);
 298         struct sk_buff *skb;
 299         struct sk_buff_head list;
 300
 301         __skb_queue_head_init(&list);
 302
 303         spin_lock_bh(&port->bc_queue.lock);
 304         skb_queue_splice_tail_init(&port->bc_queue, &list);
 305         spin_unlock_bh(&port->bc_queue.lock);
 306
 307         while ((skb = __skb_dequeue(&list))) {
 308                 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
 309
 310                 rcu_read_lock();
 311
 312                 if (!src)
 313                         /* frame comes from an external address */
 314                         macvlan_broadcast(skb, port, NULL,
 315                                           MACVLAN_MODE_PRIVATE |
 316                                           MACVLAN_MODE_VEPA    |
 317                                           MACVLAN_MODE_PASSTHRU|
 318                                           MACVLAN_MODE_BRIDGE);
 319                 else if (src->mode == MACVLAN_MODE_VEPA)
 320                         /* flood to everyone except source */
 321                         macvlan_broadcast(skb, port, src->dev,
 322                                           MACVLAN_MODE_VEPA |
 323                                           MACVLAN_MODE_BRIDGE);
 324                 else
 325                         /*
 326                          * flood only to VEPA ports, bridge ports
 327                          * already saw the frame on the way out.
 328                          */
 329                         macvlan_broadcast(skb, port, src->dev,
 330                                           MACVLAN_MODE_VEPA);
 331
 332                 rcu_read_unlock();
 333
 334                 if (src)
 335                         dev_put(src->dev);
 336                 consume_skb(skb);
 337
 338                 cond_resched();
 339         }
 340 }
 341
 342 static void macvlan_broadcast_enqueue(struct macvlan_port *port,
 343                                       const struct macvlan_dev *src,
 344                                       struct sk_buff *skb)
 345 {
 346         struct sk_buff *nskb;
 347         int err = -ENOMEM;
 348
 349         nskb = skb_clone(skb, GFP_ATOMIC);
 350         if (!nskb)
 351                 goto err;
 352
 353         MACVLAN_SKB_CB(nskb)->src = src;
 354
 355         spin_lock(&port->bc_queue.lock);
 356         if (skb_queue_len(&port->bc_queue) < port->bc_queue_len_used) {
 357                 if (src)
 358                         dev_hold(src->dev);
 359                 __skb_queue_tail(&port->bc_queue, nskb);
 360                 err = 0;
 361         }
 362         spin_unlock(&port->bc_queue.lock);
 363
 364         schedule_work(&port->bc_work);
 365
 366         if (err)
 367                 goto free_nskb;
 368
 369         return;
 370
 371 free_nskb:
 372         kfree_skb(nskb);
 373 err:
 374         dev_core_stats_rx_dropped_inc(skb->dev);
 375 }
 376
 377 static void macvlan_flush_sources(struct macvlan_port *port,
 378                                   struct macvlan_dev *vlan)
 379 {
 380         struct macvlan_source_entry *entry;
 381         struct hlist_node *next;
 382         int i;
 383
 384         hash_for_each_safe(port->vlan_source_hash, i, next, entry, hlist)
 385                 if (entry->vlan == vlan)
 386                         macvlan_hash_del_source(entry);
 387
 388         vlan->macaddr_count = 0;
 389 }
 390
 391 static void macvlan_forward_source_one(struct sk_buff *skb,
 392                                        struct macvlan_dev *vlan)
 393 {
 394         struct sk_buff *nskb;
 395         struct net_device *dev;
 396         int len;
 397         int ret;
 398
 399         dev = vlan->dev;
 400         if (unlikely(!(dev->flags & IFF_UP)))
 401                 return;
 402
 403         nskb = skb_clone(skb, GFP_ATOMIC);
 404         if (!nskb)
 405                 return;
 406
 407         len = nskb->len + ETH_HLEN;
 408         nskb->dev = dev;
 409
 410         if (ether_addr_equal_64bits(eth_hdr(skb)->h_dest, dev->dev_addr))
 411                 nskb->pkt_type = PACKET_HOST;
 412
 413         ret = __netif_rx(nskb);
 414         macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
 415 }
 416
 417 static bool macvlan_forward_source(struct sk_buff *skb,
 418                                    struct macvlan_port *port,
 419                                    const unsigned char *addr)
 420 {
 421         struct macvlan_source_entry *entry;
 422         u32 idx = macvlan_eth_hash(addr);
 423         struct hlist_head *h = &port->vlan_source_hash[idx];
 424         bool consume = false;
 425
 426         hlist_for_each_entry_rcu(entry, h, hlist) {
 427                 if (ether_addr_equal_64bits(entry->addr, addr)) {
 428                         if (entry->vlan->flags & MACVLAN_FLAG_NODST)
 429                                 consume = true;
 430                         macvlan_forward_source_one(skb, entry->vlan);
 431                 }
 432         }
 433
 434         return consume;
 435 }
 436
 437 /* called under rcu_read_lock() from netif_receive_skb */
 438 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
 439 {
 440         struct macvlan_port *port;
 441         struct sk_buff *skb = *pskb;
 442         const struct ethhdr *eth = eth_hdr(skb);
 443         const struct macvlan_dev *vlan;
 444         const struct macvlan_dev *src;
 445         struct net_device *dev;
 446         unsigned int len = 0;
 447         int ret;
 448         rx_handler_result_t handle_res;
 449
 450         /* Packets from dev_loopback_xmit() do not have L2 header, bail out */
 451         if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
 452                 return RX_HANDLER_PASS;
 453
 454         port = macvlan_port_get_rcu(skb->dev);
 455         if (is_multicast_ether_addr(eth->h_dest)) {
 456                 unsigned int hash;
 457
 458                 skb = ip_check_defrag(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN);
 459                 if (!skb)
 460                         return RX_HANDLER_CONSUMED;
 461                 *pskb = skb;
 462                 eth = eth_hdr(skb);
 463                 if (macvlan_forward_source(skb, port, eth->h_source)) {
 464                         kfree_skb(skb);
 465                         return RX_HANDLER_CONSUMED;
 466                 }
 467                 src = macvlan_hash_lookup(port, eth->h_source);
 468                 if (src && src->mode != MACVLAN_MODE_VEPA &&
 469                     src->mode != MACVLAN_MODE_BRIDGE) {
 470                         /* forward to original port. */
 471                         vlan = src;
 472                         ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
 473                               __netif_rx(skb);
 474                         handle_res = RX_HANDLER_CONSUMED;
 475                         goto out;
 476                 }
 477
 478                 hash = mc_hash(NULL, eth->h_dest);
 479                 if (test_bit(hash, port->mc_filter))
 480                         macvlan_broadcast_enqueue(port, src, skb);
 481
 482                 return RX_HANDLER_PASS;
 483         }
 484
 485         if (macvlan_forward_source(skb, port, eth->h_source)) {
 486                 kfree_skb(skb);
 487                 return RX_HANDLER_CONSUMED;
 488         }
 489         if (macvlan_passthru(port))
 490                 vlan = list_first_or_null_rcu(&port->vlans,
 491                                               struct macvlan_dev, list);
 492         else
 493                 vlan = macvlan_hash_lookup(port, eth->h_dest);
 494         if (!vlan || vlan->mode == MACVLAN_MODE_SOURCE)
 495                 return RX_HANDLER_PASS;
 496
 497         dev = vlan->dev;
 498         if (unlikely(!(dev->flags & IFF_UP))) {
 499                 kfree_skb(skb);
 500                 return RX_HANDLER_CONSUMED;
 501         }
 502         len = skb->len + ETH_HLEN;
 503         skb = skb_share_check(skb, GFP_ATOMIC);
 504         if (!skb) {
 505                 ret = NET_RX_DROP;
 506                 handle_res = RX_HANDLER_CONSUMED;
 507                 goto out;
 508         }
 509
 510         *pskb = skb;
 511         skb->dev = dev;
 512         skb->pkt_type = PACKET_HOST;
 513
 514         ret = NET_RX_SUCCESS;
 515         handle_res = RX_HANDLER_ANOTHER;
 516 out:
 517         macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
 518         return handle_res;
 519 }
 520
 521 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
 522 {
 523         const struct macvlan_dev *vlan = netdev_priv(dev);
 524         const struct macvlan_port *port = vlan->port;
 525         const struct macvlan_dev *dest;
 526
 527         if (vlan->mode == MACVLAN_MODE_BRIDGE) {
 528                 const struct ethhdr *eth = skb_eth_hdr(skb);
 529
 530                 /* send to other bridge ports directly */
 531                 if (is_multicast_ether_addr(eth->h_dest)) {
 532                         skb_reset_mac_header(skb);
 533                         macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
 534                         goto xmit_world;
 535                 }
 536
 537                 dest = macvlan_hash_lookup(port, eth->h_dest);
 538                 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
 539                         /* send to lowerdev first for its network taps */
 540                         dev_forward_skb(vlan->lowerdev, skb);
 541
 542                         return NET_XMIT_SUCCESS;
 543                 }
 544         }
 545 xmit_world:
 546         skb->dev = vlan->lowerdev;
 547         return dev_queue_xmit_accel(skb,
 548                                     netdev_get_sb_channel(dev) ? dev : NULL);
 549 }
 550
 551 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
 552 {
 553 #ifdef CONFIG_NET_POLL_CONTROLLER
 554         return netpoll_send_skb(vlan->netpoll, skb);
 555 #else
 556         BUG();
 557         return NETDEV_TX_OK;
 558 #endif
 559 }
 560
 561 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
 562                                       struct net_device *dev)
 563 {
 564         struct macvlan_dev *vlan = netdev_priv(dev);
 565         unsigned int len = skb->len;
 566         int ret;
 567
 568         if (unlikely(netpoll_tx_running(dev)))
 569                 return macvlan_netpoll_send_skb(vlan, skb);
 570
 571         ret = macvlan_queue_xmit(skb, dev);
 572
 573         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 574                 struct vlan_pcpu_stats *pcpu_stats;
 575
 576                 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
 577                 u64_stats_update_begin(&pcpu_stats->syncp);
 578                 pcpu_stats->tx_packets++;
 579                 pcpu_stats->tx_bytes += len;
 580                 u64_stats_update_end(&pcpu_stats->syncp);
 581         } else {
 582                 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
 583         }
 584         return ret;
 585 }
 586
 587 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
 588                                unsigned short type, const void *daddr,
 589                                const void *saddr, unsigned len)
 590 {
 591         const struct macvlan_dev *vlan = netdev_priv(dev);
 592         struct net_device *lowerdev = vlan->lowerdev;
 593
 594         return dev_hard_header(skb, lowerdev, type, daddr,
 595                                saddr ? : dev->dev_addr, len);
 596 }
 597
 598 static const struct header_ops macvlan_hard_header_ops = {
 599         .create         = macvlan_hard_header,
 600         .parse          = eth_header_parse,
 601         .cache          = eth_header_cache,
 602         .cache_update   = eth_header_cache_update,
 603 };
 604
 605 static int macvlan_open(struct net_device *dev)
 606 {
 607         struct macvlan_dev *vlan = netdev_priv(dev);
 608         struct net_device *lowerdev = vlan->lowerdev;
 609         int err;
 610
 611         if (macvlan_passthru(vlan->port)) {
 612                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
 613                         err = dev_set_promiscuity(lowerdev, 1);
 614                         if (err < 0)
 615                                 goto out;
 616                 }
 617                 goto hash_add;
 618         }
 619
 620         err = -EADDRINUSE;
 621         if (macvlan_addr_busy(vlan->port, dev->dev_addr))
 622                 goto out;
 623
 624         /* Attempt to populate accel_priv which is used to offload the L2
 625          * forwarding requests for unicast packets.
 626          */
 627         if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD)
 628                 vlan->accel_priv =
 629                       lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
 630
 631         /* If earlier attempt to offload failed, or accel_priv is not
 632          * populated we must add the unicast address to the lower device.
 633          */
 634         if (IS_ERR_OR_NULL(vlan->accel_priv)) {
 635                 vlan->accel_priv = NULL;
 636                 err = dev_uc_add(lowerdev, dev->dev_addr);
 637                 if (err < 0)
 638                         goto out;
 639         }
 640
 641         if (dev->flags & IFF_ALLMULTI) {
 642                 err = dev_set_allmulti(lowerdev, 1);
 643                 if (err < 0)
 644                         goto del_unicast;
 645         }
 646
 647         if (dev->flags & IFF_PROMISC) {
 648                 err = dev_set_promiscuity(lowerdev, 1);
 649                 if (err < 0)
 650                         goto clear_multi;
 651         }
 652
 653 hash_add:
 654         macvlan_hash_add(vlan);
 655         return 0;
 656
 657 clear_multi:
 658         if (dev->flags & IFF_ALLMULTI)
 659                 dev_set_allmulti(lowerdev, -1);
 660 del_unicast:
 661         if (vlan->accel_priv) {
 662                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
 663                                                            vlan->accel_priv);
 664                 vlan->accel_priv = NULL;
 665         } else {
 666                 dev_uc_del(lowerdev, dev->dev_addr);
 667         }
 668 out:
 669         return err;
 670 }
 671
 672 static int macvlan_stop(struct net_device *dev)
 673 {
 674         struct macvlan_dev *vlan = netdev_priv(dev);
 675         struct net_device *lowerdev = vlan->lowerdev;
 676
 677         if (vlan->accel_priv) {
 678                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
 679                                                            vlan->accel_priv);
 680                 vlan->accel_priv = NULL;
 681         }
 682
 683         dev_uc_unsync(lowerdev, dev);
 684         dev_mc_unsync(lowerdev, dev);
 685
 686         if (macvlan_passthru(vlan->port)) {
 687                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
 688                         dev_set_promiscuity(lowerdev, -1);
 689                 goto hash_del;
 690         }
 691
 692         if (dev->flags & IFF_ALLMULTI)
 693                 dev_set_allmulti(lowerdev, -1);
 694
 695         if (dev->flags & IFF_PROMISC)
 696                 dev_set_promiscuity(lowerdev, -1);
 697
 698         dev_uc_del(lowerdev, dev->dev_addr);
 699
 700 hash_del:
 701         macvlan_hash_del(vlan, !dev->dismantle);
 702         return 0;
 703 }
 704
 705 static int macvlan_sync_address(struct net_device *dev,
 706                                 const unsigned char *addr)
 707 {
 708         struct macvlan_dev *vlan = netdev_priv(dev);
 709         struct net_device *lowerdev = vlan->lowerdev;
 710         struct macvlan_port *port = vlan->port;
 711         int err;
 712
 713         if (!(dev->flags & IFF_UP)) {
 714                 /* Just copy in the new address */
 715                 eth_hw_addr_set(dev, addr);
 716         } else {
 717                 /* Rehash and update the device filters */
 718                 if (macvlan_addr_busy(vlan->port, addr))
 719                         return -EADDRINUSE;
 720
 721                 if (!macvlan_passthru(port)) {
 722                         err = dev_uc_add(lowerdev, addr);
 723                         if (err)
 724                                 return err;
 725
 726                         dev_uc_del(lowerdev, dev->dev_addr);
 727                 }
 728
 729                 macvlan_hash_change_addr(vlan, addr);
 730         }
 731         if (macvlan_passthru(port) && !macvlan_addr_change(port)) {
 732                 /* Since addr_change isn't set, we are here due to lower
 733                  * device change.  Save the lower-dev address so we can
 734                  * restore it later.
 735                  */
 736                 ether_addr_copy(vlan->port->perm_addr,
 737                                 lowerdev->dev_addr);
 738         }
 739         macvlan_clear_addr_change(port);
 740         return 0;
 741 }
 742
 743 static int macvlan_set_mac_address(struct net_device *dev, void *p)
 744 {
 745         struct macvlan_dev *vlan = netdev_priv(dev);
 746         struct sockaddr *addr = p;
 747
 748         if (!is_valid_ether_addr(addr->sa_data))
 749                 return -EADDRNOTAVAIL;
 750
 751         /* If the addresses are the same, this is a no-op */
 752         if (ether_addr_equal(dev->dev_addr, addr->sa_data))
 753                 return 0;
 754
 755         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
 756                 macvlan_set_addr_change(vlan->port);
 757                 return dev_set_mac_address(vlan->lowerdev, addr, NULL);
 758         }
 759
 760         if (macvlan_addr_busy(vlan->port, addr->sa_data))
 761                 return -EADDRINUSE;
 762
 763         return macvlan_sync_address(dev, addr->sa_data);
 764 }
 765
 766 static void macvlan_change_rx_flags(struct net_device *dev, int change)
 767 {
 768         struct macvlan_dev *vlan = netdev_priv(dev);
 769         struct net_device *lowerdev = vlan->lowerdev;
 770
 771         if (dev->flags & IFF_UP) {
 772                 if (change & IFF_ALLMULTI)
 773                         dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 774                 if (change & IFF_PROMISC)
 775                         dev_set_promiscuity(lowerdev,
 776                                             dev->flags & IFF_PROMISC ? 1 : -1);
 777
 778         }
 779 }
 780
 781 static void macvlan_compute_filter(unsigned long *mc_filter,
 782                                    struct net_device *dev,
 783                                    struct macvlan_dev *vlan)
 784 {
 785         if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
 786                 bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ);
 787         } else {
 788                 struct netdev_hw_addr *ha;
 789                 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
 790
 791                 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
 792                 netdev_for_each_mc_addr(ha, dev) {
 793                         __set_bit(mc_hash(vlan, ha->addr), filter);
 794                 }
 795
 796                 __set_bit(mc_hash(vlan, dev->broadcast), filter);
 797
 798                 bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ);
 799         }
 800 }
 801
 802 static void macvlan_set_mac_lists(struct net_device *dev)
 803 {
 804         struct macvlan_dev *vlan = netdev_priv(dev);
 805
 806         macvlan_compute_filter(vlan->mc_filter, dev, vlan);
 807
 808         dev_uc_sync(vlan->lowerdev, dev);
 809         dev_mc_sync(vlan->lowerdev, dev);
 810
 811         /* This is slightly inaccurate as we're including the subscription
 812          * list of vlan->lowerdev too.
 813          *
 814          * Bug alert: This only works if everyone has the same broadcast
 815          * address as lowerdev.  As soon as someone changes theirs this
 816          * will break.
 817          *
 818          * However, this is already broken as when you change your broadcast
 819          * address we don't get called.
 820          *
 821          * The solution is to maintain a list of broadcast addresses like
 822          * we do for uc/mc, if you care.
 823          */
 824         macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL);
 825 }
 826
 827 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
 828 {
 829         struct macvlan_dev *vlan = netdev_priv(dev);
 830
 831         if (vlan->lowerdev->mtu < new_mtu)
 832                 return -EINVAL;
 833         dev->mtu = new_mtu;
 834         return 0;
 835 }
 836
 837 static int macvlan_eth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 838 {
 839         struct net_device *real_dev = macvlan_dev_real_dev(dev);
 840         const struct net_device_ops *ops = real_dev->netdev_ops;
 841         struct ifreq ifrr;
 842         int err = -EOPNOTSUPP;
 843
 844         strscpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
 845         ifrr.ifr_ifru = ifr->ifr_ifru;
 846
 847         switch (cmd) {
 848         case SIOCSHWTSTAMP:
 849                 if (!net_eq(dev_net(dev), &init_net))
 850                         break;
 851                 fallthrough;
 852         case SIOCGHWTSTAMP:
 853                 if (netif_device_present(real_dev) && ops->ndo_eth_ioctl)
 854                         err = ops->ndo_eth_ioctl(real_dev, &ifrr, cmd);
 855                 break;
 856         }
 857
 858         if (!err)
 859                 ifr->ifr_ifru = ifrr.ifr_ifru;
 860
 861         return err;
 862 }
 863
 864 /*
 865  * macvlan network devices have devices nesting below it and are a special
 866  * "super class" of normal network devices; split their locks off into a
 867  * separate class since they always nest.
 868  */
 869 static struct lock_class_key macvlan_netdev_addr_lock_key;
 870
 871 #define ALWAYS_ON_OFFLOADS \
 872         (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | \
 873          NETIF_F_GSO_ROBUST | NETIF_F_GSO_ENCAP_ALL)
 874
 875 #define ALWAYS_ON_FEATURES (ALWAYS_ON_OFFLOADS | NETIF_F_LLTX)
 876
 877 #define MACVLAN_FEATURES \
 878         (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
 879          NETIF_F_GSO | NETIF_F_TSO | NETIF_F_LRO | \
 880          NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
 881          NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
 882
 883 #define MACVLAN_STATE_MASK \
 884         ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
 885
 886 static void macvlan_set_lockdep_class(struct net_device *dev)
 887 {
 888         netdev_lockdep_set_classes(dev);
 889         lockdep_set_class(&dev->addr_list_lock,
 890                           &macvlan_netdev_addr_lock_key);
 891 }
 892
 893 static int macvlan_init(struct net_device *dev)
 894 {
 895         struct macvlan_dev *vlan = netdev_priv(dev);
 896         struct net_device *lowerdev = vlan->lowerdev;
 897         struct macvlan_port *port = vlan->port;
 898
 899         dev->state              = (dev->state & ~MACVLAN_STATE_MASK) |
 900                                   (lowerdev->state & MACVLAN_STATE_MASK);
 901         dev->features           = lowerdev->features & MACVLAN_FEATURES;
 902         dev->features           |= ALWAYS_ON_FEATURES;
 903         dev->hw_features        |= NETIF_F_LRO;
 904         dev->vlan_features      = lowerdev->vlan_features & MACVLAN_FEATURES;
 905         dev->vlan_features      |= ALWAYS_ON_OFFLOADS;
 906         dev->hw_enc_features    |= dev->features;
 907         netif_set_gso_max_size(dev, lowerdev->gso_max_size);
 908         netif_set_gso_max_segs(dev, lowerdev->gso_max_segs);
 909         dev->hard_header_len    = lowerdev->hard_header_len;
 910         macvlan_set_lockdep_class(dev);
 911
 912         vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
 913         if (!vlan->pcpu_stats)
 914                 return -ENOMEM;
 915
 916         port->count += 1;
 917
 918         /* Get macvlan's reference to lowerdev */
 919         dev_hold_track(lowerdev, &vlan->dev_tracker, GFP_KERNEL);
 920
 921         return 0;
 922 }
 923
 924 static void macvlan_uninit(struct net_device *dev)
 925 {
 926         struct macvlan_dev *vlan = netdev_priv(dev);
 927         struct macvlan_port *port = vlan->port;
 928
 929         free_percpu(vlan->pcpu_stats);
 930
 931         macvlan_flush_sources(port, vlan);
 932         port->count -= 1;
 933         if (!port->count)
 934                 macvlan_port_destroy(port->dev);
 935 }
 936
 937 static void macvlan_dev_get_stats64(struct net_device *dev,
 938                                     struct rtnl_link_stats64 *stats)
 939 {
 940         struct macvlan_dev *vlan = netdev_priv(dev);
 941
 942         if (vlan->pcpu_stats) {
 943                 struct vlan_pcpu_stats *p;
 944                 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
 945                 u32 rx_errors = 0, tx_dropped = 0;
 946                 unsigned int start;
 947                 int i;
 948
 949                 for_each_possible_cpu(i) {
 950                         p = per_cpu_ptr(vlan->pcpu_stats, i);
 951                         do {
 952                                 start = u64_stats_fetch_begin_irq(&p->syncp);
 953                                 rx_packets      = p->rx_packets;
 954                                 rx_bytes        = p->rx_bytes;
 955                                 rx_multicast    = p->rx_multicast;
 956                                 tx_packets      = p->tx_packets;
 957                                 tx_bytes        = p->tx_bytes;
 958                         } while (u64_stats_fetch_retry_irq(&p->syncp, start));
 959
 960                         stats->rx_packets       += rx_packets;
 961                         stats->rx_bytes         += rx_bytes;
 962                         stats->multicast        += rx_multicast;
 963                         stats->tx_packets       += tx_packets;
 964                         stats->tx_bytes         += tx_bytes;
 965                         /* rx_errors & tx_dropped are u32, updated
 966                          * without syncp protection.
 967                          */
 968                         rx_errors       += p->rx_errors;
 969                         tx_dropped      += p->tx_dropped;
 970                 }
 971                 stats->rx_errors        = rx_errors;
 972                 stats->rx_dropped       = rx_errors;
 973                 stats->tx_dropped       = tx_dropped;
 974         }
 975 }
 976
 977 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
 978                                    __be16 proto, u16 vid)
 979 {
 980         struct macvlan_dev *vlan = netdev_priv(dev);
 981         struct net_device *lowerdev = vlan->lowerdev;
 982
 983         return vlan_vid_add(lowerdev, proto, vid);
 984 }
 985
 986 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
 987                                     __be16 proto, u16 vid)
 988 {
 989         struct macvlan_dev *vlan = netdev_priv(dev);
 990         struct net_device *lowerdev = vlan->lowerdev;
 991
 992         vlan_vid_del(lowerdev, proto, vid);
 993         return 0;
 994 }
 995
 996 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 997                            struct net_device *dev,
 998                            const unsigned char *addr, u16 vid,
 999                            u16 flags,
1000                            struct netlink_ext_ack *extack)
1001 {
1002         struct macvlan_dev *vlan = netdev_priv(dev);
1003         int err = -EINVAL;
1004
1005         /* Support unicast filter only on passthru devices.
1006          * Multicast filter should be allowed on all devices.
1007          */
1008         if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
1009                 return -EOPNOTSUPP;
1010
1011         if (flags & NLM_F_REPLACE)
1012                 return -EOPNOTSUPP;
1013
1014         if (is_unicast_ether_addr(addr))
1015                 err = dev_uc_add_excl(dev, addr);
1016         else if (is_multicast_ether_addr(addr))
1017                 err = dev_mc_add_excl(dev, addr);
1018
1019         return err;
1020 }
1021
1022 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
1023                            struct net_device *dev,
1024                            const unsigned char *addr, u16 vid)
1025 {
1026         struct macvlan_dev *vlan = netdev_priv(dev);
1027         int err = -EINVAL;
1028
1029         /* Support unicast filter only on passthru devices.
1030          * Multicast filter should be allowed on all devices.
1031          */
1032         if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
1033                 return -EOPNOTSUPP;
1034
1035         if (is_unicast_ether_addr(addr))
1036                 err = dev_uc_del(dev, addr);
1037         else if (is_multicast_ether_addr(addr))
1038                 err = dev_mc_del(dev, addr);
1039
1040         return err;
1041 }
1042
1043 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
1044                                         struct ethtool_drvinfo *drvinfo)
1045 {
1046         strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
1047         strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
1048 }
1049
1050 static int macvlan_ethtool_get_link_ksettings(struct net_device *dev,
1051                                               struct ethtool_link_ksettings *cmd)
1052 {
1053         const struct macvlan_dev *vlan = netdev_priv(dev);
1054
1055         return __ethtool_get_link_ksettings(vlan->lowerdev, cmd);
1056 }
1057
1058 static int macvlan_ethtool_get_ts_info(struct net_device *dev,
1059                                        struct ethtool_ts_info *info)
1060 {
1061         struct net_device *real_dev = macvlan_dev_real_dev(dev);
1062         const struct ethtool_ops *ops = real_dev->ethtool_ops;
1063         struct phy_device *phydev = real_dev->phydev;
1064
1065         if (phy_has_tsinfo(phydev)) {
1066                 return phy_ts_info(phydev, info);
1067         } else if (ops->get_ts_info) {
1068                 return ops->get_ts_info(real_dev, info);
1069         } else {
1070                 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
1071                         SOF_TIMESTAMPING_SOFTWARE;
1072                 info->phc_index = -1;
1073         }
1074
1075         return 0;
1076 }
1077
1078 static netdev_features_t macvlan_fix_features(struct net_device *dev,
1079                                               netdev_features_t features)
1080 {
1081         struct macvlan_dev *vlan = netdev_priv(dev);
1082         netdev_features_t lowerdev_features = vlan->lowerdev->features;
1083         netdev_features_t mask;
1084
1085         features |= NETIF_F_ALL_FOR_ALL;
1086         features &= (vlan->set_features | ~MACVLAN_FEATURES);
1087         mask = features;
1088
1089         lowerdev_features &= (features | ~NETIF_F_LRO);
1090         features = netdev_increment_features(lowerdev_features, features, mask);
1091         features |= ALWAYS_ON_FEATURES;
1092         features &= (ALWAYS_ON_FEATURES | MACVLAN_FEATURES);
1093
1094         return features;
1095 }
1096
1097 #ifdef CONFIG_NET_POLL_CONTROLLER
1098 static void macvlan_dev_poll_controller(struct net_device *dev)
1099 {
1100         return;
1101 }
1102
1103 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
1104 {
1105         struct macvlan_dev *vlan = netdev_priv(dev);
1106         struct net_device *real_dev = vlan->lowerdev;
1107         struct netpoll *netpoll;
1108         int err;
1109
1110         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
1111         err = -ENOMEM;
1112         if (!netpoll)
1113                 goto out;
1114
1115         err = __netpoll_setup(netpoll, real_dev);
1116         if (err) {
1117                 kfree(netpoll);
1118                 goto out;
1119         }
1120
1121         vlan->netpoll = netpoll;
1122
1123 out:
1124         return err;
1125 }
1126
1127 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
1128 {
1129         struct macvlan_dev *vlan = netdev_priv(dev);
1130         struct netpoll *netpoll = vlan->netpoll;
1131
1132         if (!netpoll)
1133                 return;
1134
1135         vlan->netpoll = NULL;
1136
1137         __netpoll_free(netpoll);
1138 }
1139 #endif  /* CONFIG_NET_POLL_CONTROLLER */
1140
1141 static int macvlan_dev_get_iflink(const struct net_device *dev)
1142 {
1143         struct macvlan_dev *vlan = netdev_priv(dev);
1144
1145         return vlan->lowerdev->ifindex;
1146 }
1147
1148 static const struct ethtool_ops macvlan_ethtool_ops = {
1149         .get_link               = ethtool_op_get_link,
1150         .get_link_ksettings     = macvlan_ethtool_get_link_ksettings,
1151         .get_drvinfo            = macvlan_ethtool_get_drvinfo,
1152         .get_ts_info            = macvlan_ethtool_get_ts_info,
1153 };
1154
1155 static const struct net_device_ops macvlan_netdev_ops = {
1156         .ndo_init               = macvlan_init,
1157         .ndo_uninit             = macvlan_uninit,
1158         .ndo_open               = macvlan_open,
1159         .ndo_stop               = macvlan_stop,
1160         .ndo_start_xmit         = macvlan_start_xmit,
1161         .ndo_change_mtu         = macvlan_change_mtu,
1162         .ndo_eth_ioctl          = macvlan_eth_ioctl,
1163         .ndo_fix_features       = macvlan_fix_features,
1164         .ndo_change_rx_flags    = macvlan_change_rx_flags,
1165         .ndo_set_mac_address    = macvlan_set_mac_address,
1166         .ndo_set_rx_mode        = macvlan_set_mac_lists,
1167         .ndo_get_stats64        = macvlan_dev_get_stats64,
1168         .ndo_validate_addr      = eth_validate_addr,
1169         .ndo_vlan_rx_add_vid    = macvlan_vlan_rx_add_vid,
1170         .ndo_vlan_rx_kill_vid   = macvlan_vlan_rx_kill_vid,
1171         .ndo_fdb_add            = macvlan_fdb_add,
1172         .ndo_fdb_del            = macvlan_fdb_del,
1173         .ndo_fdb_dump           = ndo_dflt_fdb_dump,
1174 #ifdef CONFIG_NET_POLL_CONTROLLER
1175         .ndo_poll_controller    = macvlan_dev_poll_controller,
1176         .ndo_netpoll_setup      = macvlan_dev_netpoll_setup,
1177         .ndo_netpoll_cleanup    = macvlan_dev_netpoll_cleanup,
1178 #endif
1179         .ndo_get_iflink         = macvlan_dev_get_iflink,
1180         .ndo_features_check     = passthru_features_check,
1181 };
1182
1183 static void macvlan_dev_free(struct net_device *dev)
1184 {
1185         struct macvlan_dev *vlan = netdev_priv(dev);
1186
1187         /* Get rid of the macvlan's reference to lowerdev */
1188         dev_put_track(vlan->lowerdev, &vlan->dev_tracker);
1189 }
1190
1191 void macvlan_common_setup(struct net_device *dev)
1192 {
1193         ether_setup(dev);
1194
1195         dev->min_mtu            = 0;
1196         dev->max_mtu            = ETH_MAX_MTU;
1197         dev->priv_flags        &= ~IFF_TX_SKB_SHARING;
1198         netif_keep_dst(dev);
1199         dev->priv_flags        |= IFF_UNICAST_FLT | IFF_CHANGE_PROTO_DOWN;
1200         dev->netdev_ops         = &macvlan_netdev_ops;
1201         dev->needs_free_netdev  = true;
1202         dev->priv_destructor    = macvlan_dev_free;
1203         dev->header_ops         = &macvlan_hard_header_ops;
1204         dev->ethtool_ops        = &macvlan_ethtool_ops;
1205 }
1206 EXPORT_SYMBOL_GPL(macvlan_common_setup);
1207
1208 static void macvlan_setup(struct net_device *dev)
1209 {
1210         macvlan_common_setup(dev);
1211         dev->priv_flags |= IFF_NO_QUEUE;
1212 }
1213
1214 static int macvlan_port_create(struct net_device *dev)
1215 {
1216         struct macvlan_port *port;
1217         unsigned int i;
1218         int err;
1219
1220         if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1221                 return -EINVAL;
1222
1223         if (netdev_is_rx_handler_busy(dev))
1224                 return -EBUSY;
1225
1226         port = kzalloc(sizeof(*port), GFP_KERNEL);
1227         if (port == NULL)
1228                 return -ENOMEM;
1229
1230         port->dev = dev;
1231         ether_addr_copy(port->perm_addr, dev->dev_addr);
1232         INIT_LIST_HEAD(&port->vlans);
1233         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1234                 INIT_HLIST_HEAD(&port->vlan_hash[i]);
1235         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1236                 INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1237
1238         port->bc_queue_len_used = 0;
1239         skb_queue_head_init(&port->bc_queue);
1240         INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1241
1242         err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1243         if (err)
1244                 kfree(port);
1245         else
1246                 dev->priv_flags |= IFF_MACVLAN_PORT;
1247         return err;
1248 }
1249
1250 static void macvlan_port_destroy(struct net_device *dev)
1251 {
1252         struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1253         struct sk_buff *skb;
1254
1255         dev->priv_flags &= ~IFF_MACVLAN_PORT;
1256         netdev_rx_handler_unregister(dev);
1257
1258         /* After this point, no packet can schedule bc_work anymore,
1259          * but we need to cancel it and purge left skbs if any.
1260          */
1261         cancel_work_sync(&port->bc_work);
1262
1263         while ((skb = __skb_dequeue(&port->bc_queue))) {
1264                 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
1265
1266                 if (src)
1267                         dev_put(src->dev);
1268
1269                 kfree_skb(skb);
1270         }
1271
1272         /* If the lower device address has been changed by passthru
1273          * macvlan, put it back.
1274          */
1275         if (macvlan_passthru(port) &&
1276             !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) {
1277                 struct sockaddr sa;
1278
1279                 sa.sa_family = port->dev->type;
1280                 memcpy(&sa.sa_data, port->perm_addr, port->dev->addr_len);
1281                 dev_set_mac_address(port->dev, &sa, NULL);
1282         }
1283
1284         kfree(port);
1285 }
1286
1287 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[],
1288                             struct netlink_ext_ack *extack)
1289 {
1290         struct nlattr *nla, *head;
1291         int rem, len;
1292
1293         if (tb[IFLA_ADDRESS]) {
1294                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1295                         return -EINVAL;
1296                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1297                         return -EADDRNOTAVAIL;
1298         }
1299
1300         if (!data)
1301                 return 0;
1302
1303         if (data[IFLA_MACVLAN_FLAGS] &&
1304             nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~(MACVLAN_FLAG_NOPROMISC |
1305                                                       MACVLAN_FLAG_NODST))
1306                 return -EINVAL;
1307
1308         if (data[IFLA_MACVLAN_MODE]) {
1309                 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1310                 case MACVLAN_MODE_PRIVATE:
1311                 case MACVLAN_MODE_VEPA:
1312                 case MACVLAN_MODE_BRIDGE:
1313                 case MACVLAN_MODE_PASSTHRU:
1314                 case MACVLAN_MODE_SOURCE:
1315                         break;
1316                 default:
1317                         return -EINVAL;
1318                 }
1319         }
1320
1321         if (data[IFLA_MACVLAN_MACADDR_MODE]) {
1322                 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1323                 case MACVLAN_MACADDR_ADD:
1324                 case MACVLAN_MACADDR_DEL:
1325                 case MACVLAN_MACADDR_FLUSH:
1326                 case MACVLAN_MACADDR_SET:
1327                         break;
1328                 default:
1329                         return -EINVAL;
1330                 }
1331         }
1332
1333         if (data[IFLA_MACVLAN_MACADDR]) {
1334                 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1335                         return -EINVAL;
1336
1337                 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1338                         return -EADDRNOTAVAIL;
1339         }
1340
1341         if (data[IFLA_MACVLAN_MACADDR_DATA]) {
1342                 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1343                 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1344
1345                 nla_for_each_attr(nla, head, len, rem) {
1346                         if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1347                             nla_len(nla) != ETH_ALEN)
1348                                 return -EINVAL;
1349
1350                         if (!is_valid_ether_addr(nla_data(nla)))
1351                                 return -EADDRNOTAVAIL;
1352                 }
1353         }
1354
1355         if (data[IFLA_MACVLAN_MACADDR_COUNT])
1356                 return -EINVAL;
1357
1358         return 0;
1359 }
1360
1361 /*
1362  * reconfigure list of remote source mac address
1363  * (only for macvlan devices in source mode)
1364  * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1365  * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1366  */
1367 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1368                                       struct nlattr *data[])
1369 {
1370         char *addr = NULL;
1371         int ret, rem, len;
1372         struct nlattr *nla, *head;
1373         struct macvlan_source_entry *entry;
1374
1375         if (data[IFLA_MACVLAN_MACADDR])
1376                 addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1377
1378         if (mode == MACVLAN_MACADDR_ADD) {
1379                 if (!addr)
1380                         return -EINVAL;
1381
1382                 return macvlan_hash_add_source(vlan, addr);
1383
1384         } else if (mode == MACVLAN_MACADDR_DEL) {
1385                 if (!addr)
1386                         return -EINVAL;
1387
1388                 entry = macvlan_hash_lookup_source(vlan, addr);
1389                 if (entry) {
1390                         macvlan_hash_del_source(entry);
1391                         vlan->macaddr_count--;
1392                 }
1393         } else if (mode == MACVLAN_MACADDR_FLUSH) {
1394                 macvlan_flush_sources(vlan->port, vlan);
1395         } else if (mode == MACVLAN_MACADDR_SET) {
1396                 macvlan_flush_sources(vlan->port, vlan);
1397
1398                 if (addr) {
1399                         ret = macvlan_hash_add_source(vlan, addr);
1400                         if (ret)
1401                                 return ret;
1402                 }
1403
1404                 if (!data[IFLA_MACVLAN_MACADDR_DATA])
1405                         return 0;
1406
1407                 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1408                 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1409
1410                 nla_for_each_attr(nla, head, len, rem) {
1411                         addr = nla_data(nla);
1412                         ret = macvlan_hash_add_source(vlan, addr);
1413                         if (ret)
1414                                 return ret;
1415                 }
1416         } else {
1417                 return -EINVAL;
1418         }
1419
1420         return 0;
1421 }
1422
1423 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1424                            struct nlattr *tb[], struct nlattr *data[],
1425                            struct netlink_ext_ack *extack)
1426 {
1427         struct macvlan_dev *vlan = netdev_priv(dev);
1428         struct macvlan_port *port;
1429         struct net_device *lowerdev;
1430         int err;
1431         int macmode;
1432         bool create = false;
1433
1434         if (!tb[IFLA_LINK])
1435                 return -EINVAL;
1436
1437         lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1438         if (lowerdev == NULL)
1439                 return -ENODEV;
1440
1441         /* When creating macvlans or macvtaps on top of other macvlans - use
1442          * the real device as the lowerdev.
1443          */
1444         if (netif_is_macvlan(lowerdev))
1445                 lowerdev = macvlan_dev_real_dev(lowerdev);
1446
1447         if (!tb[IFLA_MTU])
1448                 dev->mtu = lowerdev->mtu;
1449         else if (dev->mtu > lowerdev->mtu)
1450                 return -EINVAL;
1451
1452         /* MTU range: 68 - lowerdev->max_mtu */
1453         dev->min_mtu = ETH_MIN_MTU;
1454         dev->max_mtu = lowerdev->max_mtu;
1455
1456         if (!tb[IFLA_ADDRESS])
1457                 eth_hw_addr_random(dev);
1458
1459         if (!netif_is_macvlan_port(lowerdev)) {
1460                 err = macvlan_port_create(lowerdev);
1461                 if (err < 0)
1462                         return err;
1463                 create = true;
1464         }
1465         port = macvlan_port_get_rtnl(lowerdev);
1466
1467         /* Only 1 macvlan device can be created in passthru mode */
1468         if (macvlan_passthru(port)) {
1469                 /* The macvlan port must be not created this time,
1470                  * still goto destroy_macvlan_port for readability.
1471                  */
1472                 err = -EINVAL;
1473                 goto destroy_macvlan_port;
1474         }
1475
1476         vlan->lowerdev = lowerdev;
1477         vlan->dev      = dev;
1478         vlan->port     = port;
1479         vlan->set_features = MACVLAN_FEATURES;
1480
1481         vlan->mode     = MACVLAN_MODE_VEPA;
1482         if (data && data[IFLA_MACVLAN_MODE])
1483                 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1484
1485         if (data && data[IFLA_MACVLAN_FLAGS])
1486                 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1487
1488         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1489                 if (port->count) {
1490                         err = -EINVAL;
1491                         goto destroy_macvlan_port;
1492                 }
1493                 macvlan_set_passthru(port);
1494                 eth_hw_addr_inherit(dev, lowerdev);
1495         }
1496
1497         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1498                 if (vlan->mode != MACVLAN_MODE_SOURCE) {
1499                         err = -EINVAL;
1500                         goto destroy_macvlan_port;
1501                 }
1502                 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1503                 err = macvlan_changelink_sources(vlan, macmode, data);
1504                 if (err)
1505                         goto destroy_macvlan_port;
1506         }
1507
1508         vlan->bc_queue_len_req = MACVLAN_DEFAULT_BC_QUEUE_LEN;
1509         if (data && data[IFLA_MACVLAN_BC_QUEUE_LEN])
1510                 vlan->bc_queue_len_req = nla_get_u32(data[IFLA_MACVLAN_BC_QUEUE_LEN]);
1511
1512         err = register_netdevice(dev);
1513         if (err < 0)
1514                 goto destroy_macvlan_port;
1515
1516         dev->priv_flags |= IFF_MACVLAN;
1517         err = netdev_upper_dev_link(lowerdev, dev, extack);
1518         if (err)
1519                 goto unregister_netdev;
1520
1521         list_add_tail_rcu(&vlan->list, &port->vlans);
1522         update_port_bc_queue_len(vlan->port);
1523         netif_stacked_transfer_operstate(lowerdev, dev);
1524         linkwatch_fire_event(dev);
1525
1526         return 0;
1527
1528 unregister_netdev:
1529         /* macvlan_uninit would free the macvlan port */
1530         unregister_netdevice(dev);
1531         return err;
1532 destroy_macvlan_port:
1533         /* the macvlan port may be freed by macvlan_uninit when fail to register.
1534          * so we destroy the macvlan port only when it's valid.
1535          */
1536         if (create && macvlan_port_get_rtnl(lowerdev))
1537                 macvlan_port_destroy(port->dev);
1538         return err;
1539 }
1540 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1541
1542 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1543                            struct nlattr *tb[], struct nlattr *data[],
1544                            struct netlink_ext_ack *extack)
1545 {
1546         return macvlan_common_newlink(src_net, dev, tb, data, extack);
1547 }
1548
1549 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1550 {
1551         struct macvlan_dev *vlan = netdev_priv(dev);
1552
1553         if (vlan->mode == MACVLAN_MODE_SOURCE)
1554                 macvlan_flush_sources(vlan->port, vlan);
1555         list_del_rcu(&vlan->list);
1556         update_port_bc_queue_len(vlan->port);
1557         unregister_netdevice_queue(dev, head);
1558         netdev_upper_dev_unlink(vlan->lowerdev, dev);
1559 }
1560 EXPORT_SYMBOL_GPL(macvlan_dellink);
1561
1562 static int macvlan_changelink(struct net_device *dev,
1563                               struct nlattr *tb[], struct nlattr *data[],
1564                               struct netlink_ext_ack *extack)
1565 {
1566         struct macvlan_dev *vlan = netdev_priv(dev);
1567         enum macvlan_mode mode;
1568         bool set_mode = false;
1569         enum macvlan_macaddr_mode macmode;
1570         int ret;
1571
1572         /* Validate mode, but don't set yet: setting flags may fail. */
1573         if (data && data[IFLA_MACVLAN_MODE]) {
1574                 set_mode = true;
1575                 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1576                 /* Passthrough mode can't be set or cleared dynamically */
1577                 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1578                     (vlan->mode == MACVLAN_MODE_PASSTHRU))
1579                         return -EINVAL;
1580                 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1581                     vlan->mode != mode)
1582                         macvlan_flush_sources(vlan->port, vlan);
1583         }
1584
1585         if (data && data[IFLA_MACVLAN_FLAGS]) {
1586                 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1587                 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1588                 if (macvlan_passthru(vlan->port) && promisc) {
1589                         int err;
1590
1591                         if (flags & MACVLAN_FLAG_NOPROMISC)
1592                                 err = dev_set_promiscuity(vlan->lowerdev, -1);
1593                         else
1594                                 err = dev_set_promiscuity(vlan->lowerdev, 1);
1595                         if (err < 0)
1596                                 return err;
1597                 }
1598                 vlan->flags = flags;
1599         }
1600
1601         if (data && data[IFLA_MACVLAN_BC_QUEUE_LEN]) {
1602                 vlan->bc_queue_len_req = nla_get_u32(data[IFLA_MACVLAN_BC_QUEUE_LEN]);
1603                 update_port_bc_queue_len(vlan->port);
1604         }
1605
1606         if (set_mode)
1607                 vlan->mode = mode;
1608         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1609                 if (vlan->mode != MACVLAN_MODE_SOURCE)
1610                         return -EINVAL;
1611                 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1612                 ret = macvlan_changelink_sources(vlan, macmode, data);
1613                 if (ret)
1614                         return ret;
1615         }
1616         return 0;
1617 }
1618
1619 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1620 {
1621         if (vlan->macaddr_count == 0)
1622                 return 0;
1623         return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1624                 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1625 }
1626
1627 static size_t macvlan_get_size(const struct net_device *dev)
1628 {
1629         struct macvlan_dev *vlan = netdev_priv(dev);
1630
1631         return (0
1632                 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1633                 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1634                 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1635                 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1636                 + nla_total_size(4) /* IFLA_MACVLAN_BC_QUEUE_LEN */
1637                 + nla_total_size(4) /* IFLA_MACVLAN_BC_QUEUE_LEN_USED */
1638                 );
1639 }
1640
1641 static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1642                                      const struct macvlan_dev *vlan,
1643                                      const int i)
1644 {
1645         struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1646         struct macvlan_source_entry *entry;
1647
1648         hlist_for_each_entry_rcu(entry, h, hlist) {
1649                 if (entry->vlan != vlan)
1650                         continue;
1651                 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1652                         return 1;
1653         }
1654         return 0;
1655 }
1656
1657 static int macvlan_fill_info(struct sk_buff *skb,
1658                                 const struct net_device *dev)
1659 {
1660         struct macvlan_dev *vlan = netdev_priv(dev);
1661         struct macvlan_port *port = vlan->port;
1662         int i;
1663         struct nlattr *nest;
1664
1665         if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1666                 goto nla_put_failure;
1667         if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1668                 goto nla_put_failure;
1669         if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1670                 goto nla_put_failure;
1671         if (vlan->macaddr_count > 0) {
1672                 nest = nla_nest_start_noflag(skb, IFLA_MACVLAN_MACADDR_DATA);
1673                 if (nest == NULL)
1674                         goto nla_put_failure;
1675
1676                 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1677                         if (macvlan_fill_info_macaddr(skb, vlan, i))
1678                                 goto nla_put_failure;
1679                 }
1680                 nla_nest_end(skb, nest);
1681         }
1682         if (nla_put_u32(skb, IFLA_MACVLAN_BC_QUEUE_LEN, vlan->bc_queue_len_req))
1683                 goto nla_put_failure;
1684         if (nla_put_u32(skb, IFLA_MACVLAN_BC_QUEUE_LEN_USED, port->bc_queue_len_used))
1685                 goto nla_put_failure;
1686         return 0;
1687
1688 nla_put_failure:
1689         return -EMSGSIZE;
1690 }
1691
1692 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1693         [IFLA_MACVLAN_MODE]  = { .type = NLA_U32 },
1694         [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1695         [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1696         [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1697         [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1698         [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1699         [IFLA_MACVLAN_BC_QUEUE_LEN] = { .type = NLA_U32 },
1700         [IFLA_MACVLAN_BC_QUEUE_LEN_USED] = { .type = NLA_REJECT },
1701 };
1702
1703 int macvlan_link_register(struct rtnl_link_ops *ops)
1704 {
1705         /* common fields */
1706         ops->validate           = macvlan_validate;
1707         ops->maxtype            = IFLA_MACVLAN_MAX;
1708         ops->policy             = macvlan_policy;
1709         ops->changelink         = macvlan_changelink;
1710         ops->get_size           = macvlan_get_size;
1711         ops->fill_info          = macvlan_fill_info;
1712
1713         return rtnl_link_register(ops);
1714 };
1715 EXPORT_SYMBOL_GPL(macvlan_link_register);
1716
1717 static struct net *macvlan_get_link_net(const struct net_device *dev)
1718 {
1719         return dev_net(macvlan_dev_real_dev(dev));
1720 }
1721
1722 static struct rtnl_link_ops macvlan_link_ops = {
1723         .kind           = "macvlan",
1724         .setup          = macvlan_setup,
1725         .newlink        = macvlan_newlink,
1726         .dellink        = macvlan_dellink,
1727         .get_link_net   = macvlan_get_link_net,
1728         .priv_size      = sizeof(struct macvlan_dev),
1729 };
1730
1731 static void update_port_bc_queue_len(struct macvlan_port *port)
1732 {
1733         u32 max_bc_queue_len_req = 0;
1734         struct macvlan_dev *vlan;
1735
1736         list_for_each_entry(vlan, &port->vlans, list) {
1737                 if (vlan->bc_queue_len_req > max_bc_queue_len_req)
1738                         max_bc_queue_len_req = vlan->bc_queue_len_req;
1739         }
1740         port->bc_queue_len_used = max_bc_queue_len_req;
1741 }
1742
1743 static int macvlan_device_event(struct notifier_block *unused,
1744                                 unsigned long event, void *ptr)
1745 {
1746         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1747         struct macvlan_dev *vlan, *next;
1748         struct macvlan_port *port;
1749         LIST_HEAD(list_kill);
1750
1751         if (!netif_is_macvlan_port(dev))
1752                 return NOTIFY_DONE;
1753
1754         port = macvlan_port_get_rtnl(dev);
1755
1756         switch (event) {
1757         case NETDEV_UP:
1758         case NETDEV_DOWN:
1759         case NETDEV_CHANGE:
1760                 list_for_each_entry(vlan, &port->vlans, list)
1761                         netif_stacked_transfer_operstate(vlan->lowerdev,
1762                                                          vlan->dev);
1763                 break;
1764         case NETDEV_FEAT_CHANGE:
1765                 list_for_each_entry(vlan, &port->vlans, list) {
1766                         netif_set_gso_max_size(vlan->dev, dev->gso_max_size);
1767                         netif_set_gso_max_segs(vlan->dev, dev->gso_max_segs);
1768                         netdev_update_features(vlan->dev);
1769                 }
1770                 break;
1771         case NETDEV_CHANGEMTU:
1772                 list_for_each_entry(vlan, &port->vlans, list) {
1773                         if (vlan->dev->mtu <= dev->mtu)
1774                                 continue;
1775                         dev_set_mtu(vlan->dev, dev->mtu);
1776                 }
1777                 break;
1778         case NETDEV_CHANGEADDR:
1779                 if (!macvlan_passthru(port))
1780                         return NOTIFY_DONE;
1781
1782                 vlan = list_first_entry_or_null(&port->vlans,
1783                                                 struct macvlan_dev,
1784                                                 list);
1785
1786                 if (vlan && macvlan_sync_address(vlan->dev, dev->dev_addr))
1787                         return NOTIFY_BAD;
1788
1789                 break;
1790         case NETDEV_UNREGISTER:
1791                 /* twiddle thumbs on netns device moves */
1792                 if (dev->reg_state != NETREG_UNREGISTERING)
1793                         break;
1794
1795                 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1796                         vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1797                 unregister_netdevice_many(&list_kill);
1798                 break;
1799         case NETDEV_PRE_TYPE_CHANGE:
1800                 /* Forbid underlying device to change its type. */
1801                 return NOTIFY_BAD;
1802
1803         case NETDEV_NOTIFY_PEERS:
1804         case NETDEV_BONDING_FAILOVER:
1805         case NETDEV_RESEND_IGMP:
1806                 /* Propagate to all vlans */
1807                 list_for_each_entry(vlan, &port->vlans, list)
1808                         call_netdevice_notifiers(event, vlan->dev);
1809         }
1810         return NOTIFY_DONE;
1811 }
1812
1813 static struct notifier_block macvlan_notifier_block __read_mostly = {
1814         .notifier_call  = macvlan_device_event,
1815 };
1816
1817 static int __init macvlan_init_module(void)
1818 {
1819         int err;
1820
1821         register_netdevice_notifier(&macvlan_notifier_block);
1822
1823         err = macvlan_link_register(&macvlan_link_ops);
1824         if (err < 0)
1825                 goto err1;
1826         return 0;
1827 err1:
1828         unregister_netdevice_notifier(&macvlan_notifier_block);
1829         return err;
1830 }
1831
1832 static void __exit macvlan_cleanup_module(void)
1833 {
1834         rtnl_link_unregister(&macvlan_link_ops);
1835         unregister_netdevice_notifier(&macvlan_notifier_block);
1836 }
1837
1838 module_init(macvlan_init_module);
1839 module_exit(macvlan_cleanup_module);
1840
1841 MODULE_LICENSE("GPL");
1842 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1843 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1844 MODULE_ALIAS_RTNL_LINK("macvlan");