drivers/net/macvlan.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (c) 2007 Patrick McHardy <[email protected]>
   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, [email protected]
   9  * Re-worked by Ben Greear <[email protected]>
  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_ni(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         atomic_long_inc(&skb->dev->rx_dropped);
 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                         return RX_HANDLER_CONSUMED;
 465                 src = macvlan_hash_lookup(port, eth->h_source);
 466                 if (src && src->mode != MACVLAN_MODE_VEPA &&
 467                     src->mode != MACVLAN_MODE_BRIDGE) {
 468                         /* forward to original port. */
 469                         vlan = src;
 470                         ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
 471                               netif_rx(skb);
 472                         handle_res = RX_HANDLER_CONSUMED;
 473                         goto out;
 474                 }
 475
 476                 hash = mc_hash(NULL, eth->h_dest);
 477                 if (test_bit(hash, port->mc_filter))
 478                         macvlan_broadcast_enqueue(port, src, skb);
 479
 480                 return RX_HANDLER_PASS;
 481         }
 482
 483         if (macvlan_forward_source(skb, port, eth->h_source))
 484                 return RX_HANDLER_CONSUMED;
 485         if (macvlan_passthru(port))
 486                 vlan = list_first_or_null_rcu(&port->vlans,
 487                                               struct macvlan_dev, list);
 488         else
 489                 vlan = macvlan_hash_lookup(port, eth->h_dest);
 490         if (!vlan || vlan->mode == MACVLAN_MODE_SOURCE)
 491                 return RX_HANDLER_PASS;
 492
 493         dev = vlan->dev;
 494         if (unlikely(!(dev->flags & IFF_UP))) {
 495                 kfree_skb(skb);
 496                 return RX_HANDLER_CONSUMED;
 497         }
 498         len = skb->len + ETH_HLEN;
 499         skb = skb_share_check(skb, GFP_ATOMIC);
 500         if (!skb) {
 501                 ret = NET_RX_DROP;
 502                 handle_res = RX_HANDLER_CONSUMED;
 503                 goto out;
 504         }
 505
 506         *pskb = skb;
 507         skb->dev = dev;
 508         skb->pkt_type = PACKET_HOST;
 509
 510         ret = NET_RX_SUCCESS;
 511         handle_res = RX_HANDLER_ANOTHER;
 512 out:
 513         macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
 514         return handle_res;
 515 }
 516
 517 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
 518 {
 519         const struct macvlan_dev *vlan = netdev_priv(dev);
 520         const struct macvlan_port *port = vlan->port;
 521         const struct macvlan_dev *dest;
 522
 523         if (vlan->mode == MACVLAN_MODE_BRIDGE) {
 524                 const struct ethhdr *eth = skb_eth_hdr(skb);
 525
 526                 /* send to other bridge ports directly */
 527                 if (is_multicast_ether_addr(eth->h_dest)) {
 528                         skb_reset_mac_header(skb);
 529                         macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
 530                         goto xmit_world;
 531                 }
 532
 533                 dest = macvlan_hash_lookup(port, eth->h_dest);
 534                 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
 535                         /* send to lowerdev first for its network taps */
 536                         dev_forward_skb(vlan->lowerdev, skb);
 537
 538                         return NET_XMIT_SUCCESS;
 539                 }
 540         }
 541 xmit_world:
 542         skb->dev = vlan->lowerdev;
 543         return dev_queue_xmit_accel(skb,
 544                                     netdev_get_sb_channel(dev) ? dev : NULL);
 545 }
 546
 547 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
 548 {
 549 #ifdef CONFIG_NET_POLL_CONTROLLER
 550         return netpoll_send_skb(vlan->netpoll, skb);
 551 #else
 552         BUG();
 553         return NETDEV_TX_OK;
 554 #endif
 555 }
 556
 557 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
 558                                       struct net_device *dev)
 559 {
 560         struct macvlan_dev *vlan = netdev_priv(dev);
 561         unsigned int len = skb->len;
 562         int ret;
 563
 564         if (unlikely(netpoll_tx_running(dev)))
 565                 return macvlan_netpoll_send_skb(vlan, skb);
 566
 567         ret = macvlan_queue_xmit(skb, dev);
 568
 569         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 570                 struct vlan_pcpu_stats *pcpu_stats;
 571
 572                 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
 573                 u64_stats_update_begin(&pcpu_stats->syncp);
 574                 pcpu_stats->tx_packets++;
 575                 pcpu_stats->tx_bytes += len;
 576                 u64_stats_update_end(&pcpu_stats->syncp);
 577         } else {
 578                 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
 579         }
 580         return ret;
 581 }
 582
 583 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
 584                                unsigned short type, const void *daddr,
 585                                const void *saddr, unsigned len)
 586 {
 587         const struct macvlan_dev *vlan = netdev_priv(dev);
 588         struct net_device *lowerdev = vlan->lowerdev;
 589
 590         return dev_hard_header(skb, lowerdev, type, daddr,
 591                                saddr ? : dev->dev_addr, len);
 592 }
 593
 594 static const struct header_ops macvlan_hard_header_ops = {
 595         .create         = macvlan_hard_header,
 596         .parse          = eth_header_parse,
 597         .cache          = eth_header_cache,
 598         .cache_update   = eth_header_cache_update,
 599 };
 600
 601 static int macvlan_open(struct net_device *dev)
 602 {
 603         struct macvlan_dev *vlan = netdev_priv(dev);
 604         struct net_device *lowerdev = vlan->lowerdev;
 605         int err;
 606
 607         if (macvlan_passthru(vlan->port)) {
 608                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
 609                         err = dev_set_promiscuity(lowerdev, 1);
 610                         if (err < 0)
 611                                 goto out;
 612                 }
 613                 goto hash_add;
 614         }
 615
 616         err = -EADDRINUSE;
 617         if (macvlan_addr_busy(vlan->port, dev->dev_addr))
 618                 goto out;
 619
 620         /* Attempt to populate accel_priv which is used to offload the L2
 621          * forwarding requests for unicast packets.
 622          */
 623         if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD)
 624                 vlan->accel_priv =
 625                       lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
 626
 627         /* If earlier attempt to offload failed, or accel_priv is not
 628          * populated we must add the unicast address to the lower device.
 629          */
 630         if (IS_ERR_OR_NULL(vlan->accel_priv)) {
 631                 vlan->accel_priv = NULL;
 632                 err = dev_uc_add(lowerdev, dev->dev_addr);
 633                 if (err < 0)
 634                         goto out;
 635         }
 636
 637         if (dev->flags & IFF_ALLMULTI) {
 638                 err = dev_set_allmulti(lowerdev, 1);
 639                 if (err < 0)
 640                         goto del_unicast;
 641         }
 642
 643         if (dev->flags & IFF_PROMISC) {
 644                 err = dev_set_promiscuity(lowerdev, 1);
 645                 if (err < 0)
 646                         goto clear_multi;
 647         }
 648
 649 hash_add:
 650         macvlan_hash_add(vlan);
 651         return 0;
 652
 653 clear_multi:
 654         if (dev->flags & IFF_ALLMULTI)
 655                 dev_set_allmulti(lowerdev, -1);
 656 del_unicast:
 657         if (vlan->accel_priv) {
 658                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
 659                                                            vlan->accel_priv);
 660                 vlan->accel_priv = NULL;
 661         } else {
 662                 dev_uc_del(lowerdev, dev->dev_addr);
 663         }
 664 out:
 665         return err;
 666 }
 667
 668 static int macvlan_stop(struct net_device *dev)
 669 {
 670         struct macvlan_dev *vlan = netdev_priv(dev);
 671         struct net_device *lowerdev = vlan->lowerdev;
 672
 673         if (vlan->accel_priv) {
 674                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
 675                                                            vlan->accel_priv);
 676                 vlan->accel_priv = NULL;
 677         }
 678
 679         dev_uc_unsync(lowerdev, dev);
 680         dev_mc_unsync(lowerdev, dev);
 681
 682         if (macvlan_passthru(vlan->port)) {
 683                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
 684                         dev_set_promiscuity(lowerdev, -1);
 685                 goto hash_del;
 686         }
 687
 688         if (dev->flags & IFF_ALLMULTI)
 689                 dev_set_allmulti(lowerdev, -1);
 690
 691         if (dev->flags & IFF_PROMISC)
 692                 dev_set_promiscuity(lowerdev, -1);
 693
 694         dev_uc_del(lowerdev, dev->dev_addr);
 695
 696 hash_del:
 697         macvlan_hash_del(vlan, !dev->dismantle);
 698         return 0;
 699 }
 700
 701 static int macvlan_sync_address(struct net_device *dev,
 702                                 const unsigned char *addr)
 703 {
 704         struct macvlan_dev *vlan = netdev_priv(dev);
 705         struct net_device *lowerdev = vlan->lowerdev;
 706         struct macvlan_port *port = vlan->port;
 707         int err;
 708
 709         if (!(dev->flags & IFF_UP)) {
 710                 /* Just copy in the new address */
 711                 eth_hw_addr_set(dev, addr);
 712         } else {
 713                 /* Rehash and update the device filters */
 714                 if (macvlan_addr_busy(vlan->port, addr))
 715                         return -EADDRINUSE;
 716
 717                 if (!macvlan_passthru(port)) {
 718                         err = dev_uc_add(lowerdev, addr);
 719                         if (err)
 720                                 return err;
 721
 722                         dev_uc_del(lowerdev, dev->dev_addr);
 723                 }
 724
 725                 macvlan_hash_change_addr(vlan, addr);
 726         }
 727         if (macvlan_passthru(port) && !macvlan_addr_change(port)) {
 728                 /* Since addr_change isn't set, we are here due to lower
 729                  * device change.  Save the lower-dev address so we can
 730                  * restore it later.
 731                  */
 732                 ether_addr_copy(vlan->port->perm_addr,
 733                                 lowerdev->dev_addr);
 734         }
 735         macvlan_clear_addr_change(port);
 736         return 0;
 737 }
 738
 739 static int macvlan_set_mac_address(struct net_device *dev, void *p)
 740 {
 741         struct macvlan_dev *vlan = netdev_priv(dev);
 742         struct sockaddr *addr = p;
 743
 744         if (!is_valid_ether_addr(addr->sa_data))
 745                 return -EADDRNOTAVAIL;
 746
 747         /* If the addresses are the same, this is a no-op */
 748         if (ether_addr_equal(dev->dev_addr, addr->sa_data))
 749                 return 0;
 750
 751         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
 752                 macvlan_set_addr_change(vlan->port);
 753                 return dev_set_mac_address(vlan->lowerdev, addr, NULL);
 754         }
 755
 756         if (macvlan_addr_busy(vlan->port, addr->sa_data))
 757                 return -EADDRINUSE;
 758
 759         return macvlan_sync_address(dev, addr->sa_data);
 760 }
 761
 762 static void macvlan_change_rx_flags(struct net_device *dev, int change)
 763 {
 764         struct macvlan_dev *vlan = netdev_priv(dev);
 765         struct net_device *lowerdev = vlan->lowerdev;
 766
 767         if (dev->flags & IFF_UP) {
 768                 if (change & IFF_ALLMULTI)
 769                         dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 770                 if (change & IFF_PROMISC)
 771                         dev_set_promiscuity(lowerdev,
 772                                             dev->flags & IFF_PROMISC ? 1 : -1);
 773
 774         }
 775 }
 776
 777 static void macvlan_compute_filter(unsigned long *mc_filter,
 778                                    struct net_device *dev,
 779                                    struct macvlan_dev *vlan)
 780 {
 781         if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
 782                 bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ);
 783         } else {
 784                 struct netdev_hw_addr *ha;
 785                 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
 786
 787                 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
 788                 netdev_for_each_mc_addr(ha, dev) {
 789                         __set_bit(mc_hash(vlan, ha->addr), filter);
 790                 }
 791
 792                 __set_bit(mc_hash(vlan, dev->broadcast), filter);
 793
 794                 bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ);
 795         }
 796 }
 797
 798 static void macvlan_set_mac_lists(struct net_device *dev)
 799 {
 800         struct macvlan_dev *vlan = netdev_priv(dev);
 801
 802         macvlan_compute_filter(vlan->mc_filter, dev, vlan);
 803
 804         dev_uc_sync(vlan->lowerdev, dev);
 805         dev_mc_sync(vlan->lowerdev, dev);
 806
 807         /* This is slightly inaccurate as we're including the subscription
 808          * list of vlan->lowerdev too.
 809          *
 810          * Bug alert: This only works if everyone has the same broadcast
 811          * address as lowerdev.  As soon as someone changes theirs this
 812          * will break.
 813          *
 814          * However, this is already broken as when you change your broadcast
 815          * address we don't get called.
 816          *
 817          * The solution is to maintain a list of broadcast addresses like
 818          * we do for uc/mc, if you care.
 819          */
 820         macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL);
 821 }
 822
 823 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
 824 {
 825         struct macvlan_dev *vlan = netdev_priv(dev);
 826
 827         if (vlan->lowerdev->mtu < new_mtu)
 828                 return -EINVAL;
 829         dev->mtu = new_mtu;
 830         return 0;
 831 }
 832
 833 static int macvlan_eth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 834 {
 835         struct net_device *real_dev = macvlan_dev_real_dev(dev);
 836         const struct net_device_ops *ops = real_dev->netdev_ops;
 837         struct ifreq ifrr;
 838         int err = -EOPNOTSUPP;
 839
 840         strscpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
 841         ifrr.ifr_ifru = ifr->ifr_ifru;
 842
 843         switch (cmd) {
 844         case SIOCSHWTSTAMP:
 845                 if (!net_eq(dev_net(dev), &init_net))
 846                         break;
 847                 fallthrough;
 848         case SIOCGHWTSTAMP:
 849                 if (netif_device_present(real_dev) && ops->ndo_eth_ioctl)
 850                         err = ops->ndo_eth_ioctl(real_dev, &ifrr, cmd);
 851                 break;
 852         }
 853
 854         if (!err)
 855                 ifr->ifr_ifru = ifrr.ifr_ifru;
 856
 857         return err;
 858 }
 859
 860 /*
 861  * macvlan network devices have devices nesting below it and are a special
 862  * "super class" of normal network devices; split their locks off into a
 863  * separate class since they always nest.
 864  */
 865 static struct lock_class_key macvlan_netdev_addr_lock_key;
 866
 867 #define ALWAYS_ON_OFFLOADS \
 868         (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | \
 869          NETIF_F_GSO_ROBUST | NETIF_F_GSO_ENCAP_ALL)
 870
 871 #define ALWAYS_ON_FEATURES (ALWAYS_ON_OFFLOADS | NETIF_F_LLTX)
 872
 873 #define MACVLAN_FEATURES \
 874         (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
 875          NETIF_F_GSO | NETIF_F_TSO | NETIF_F_LRO | \
 876          NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
 877          NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
 878
 879 #define MACVLAN_STATE_MASK \
 880         ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
 881
 882 static void macvlan_set_lockdep_class(struct net_device *dev)
 883 {
 884         netdev_lockdep_set_classes(dev);
 885         lockdep_set_class(&dev->addr_list_lock,
 886                           &macvlan_netdev_addr_lock_key);
 887 }
 888
 889 static int macvlan_init(struct net_device *dev)
 890 {
 891         struct macvlan_dev *vlan = netdev_priv(dev);
 892         const struct net_device *lowerdev = vlan->lowerdev;
 893         struct macvlan_port *port = vlan->port;
 894
 895         dev->state              = (dev->state & ~MACVLAN_STATE_MASK) |
 896                                   (lowerdev->state & MACVLAN_STATE_MASK);
 897         dev->features           = lowerdev->features & MACVLAN_FEATURES;
 898         dev->features           |= ALWAYS_ON_FEATURES;
 899         dev->hw_features        |= NETIF_F_LRO;
 900         dev->vlan_features      = lowerdev->vlan_features & MACVLAN_FEATURES;
 901         dev->vlan_features      |= ALWAYS_ON_OFFLOADS;
 902         dev->hw_enc_features    |= dev->features;
 903         dev->gso_max_size       = lowerdev->gso_max_size;
 904         dev->gso_max_segs       = lowerdev->gso_max_segs;
 905         dev->hard_header_len    = lowerdev->hard_header_len;
 906         macvlan_set_lockdep_class(dev);
 907
 908         vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
 909         if (!vlan->pcpu_stats)
 910                 return -ENOMEM;
 911
 912         port->count += 1;
 913
 914         return 0;
 915 }
 916
 917 static void macvlan_uninit(struct net_device *dev)
 918 {
 919         struct macvlan_dev *vlan = netdev_priv(dev);
 920         struct macvlan_port *port = vlan->port;
 921
 922         free_percpu(vlan->pcpu_stats);
 923
 924         macvlan_flush_sources(port, vlan);
 925         port->count -= 1;
 926         if (!port->count)
 927                 macvlan_port_destroy(port->dev);
 928 }
 929
 930 static void macvlan_dev_get_stats64(struct net_device *dev,
 931                                     struct rtnl_link_stats64 *stats)
 932 {
 933         struct macvlan_dev *vlan = netdev_priv(dev);
 934
 935         if (vlan->pcpu_stats) {
 936                 struct vlan_pcpu_stats *p;
 937                 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
 938                 u32 rx_errors = 0, tx_dropped = 0;
 939                 unsigned int start;
 940                 int i;
 941
 942                 for_each_possible_cpu(i) {
 943                         p = per_cpu_ptr(vlan->pcpu_stats, i);
 944                         do {
 945                                 start = u64_stats_fetch_begin_irq(&p->syncp);
 946                                 rx_packets      = p->rx_packets;
 947                                 rx_bytes        = p->rx_bytes;
 948                                 rx_multicast    = p->rx_multicast;
 949                                 tx_packets      = p->tx_packets;
 950                                 tx_bytes        = p->tx_bytes;
 951                         } while (u64_stats_fetch_retry_irq(&p->syncp, start));
 952
 953                         stats->rx_packets       += rx_packets;
 954                         stats->rx_bytes         += rx_bytes;
 955                         stats->multicast        += rx_multicast;
 956                         stats->tx_packets       += tx_packets;
 957                         stats->tx_bytes         += tx_bytes;
 958                         /* rx_errors & tx_dropped are u32, updated
 959                          * without syncp protection.
 960                          */
 961                         rx_errors       += p->rx_errors;
 962                         tx_dropped      += p->tx_dropped;
 963                 }
 964                 stats->rx_errors        = rx_errors;
 965                 stats->rx_dropped       = rx_errors;
 966                 stats->tx_dropped       = tx_dropped;
 967         }
 968 }
 969
 970 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
 971                                    __be16 proto, u16 vid)
 972 {
 973         struct macvlan_dev *vlan = netdev_priv(dev);
 974         struct net_device *lowerdev = vlan->lowerdev;
 975
 976         return vlan_vid_add(lowerdev, proto, vid);
 977 }
 978
 979 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
 980                                     __be16 proto, u16 vid)
 981 {
 982         struct macvlan_dev *vlan = netdev_priv(dev);
 983         struct net_device *lowerdev = vlan->lowerdev;
 984
 985         vlan_vid_del(lowerdev, proto, vid);
 986         return 0;
 987 }
 988
 989 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 990                            struct net_device *dev,
 991                            const unsigned char *addr, u16 vid,
 992                            u16 flags,
 993                            struct netlink_ext_ack *extack)
 994 {
 995         struct macvlan_dev *vlan = netdev_priv(dev);
 996         int err = -EINVAL;
 997
 998         /* Support unicast filter only on passthru devices.
 999          * Multicast filter should be allowed on all devices.
1000          */
1001         if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
1002                 return -EOPNOTSUPP;
1003
1004         if (flags & NLM_F_REPLACE)
1005                 return -EOPNOTSUPP;
1006
1007         if (is_unicast_ether_addr(addr))
1008                 err = dev_uc_add_excl(dev, addr);
1009         else if (is_multicast_ether_addr(addr))
1010                 err = dev_mc_add_excl(dev, addr);
1011
1012         return err;
1013 }
1014
1015 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
1016                            struct net_device *dev,
1017                            const unsigned char *addr, u16 vid)
1018 {
1019         struct macvlan_dev *vlan = netdev_priv(dev);
1020         int err = -EINVAL;
1021
1022         /* Support unicast filter only on passthru devices.
1023          * Multicast filter should be allowed on all devices.
1024          */
1025         if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
1026                 return -EOPNOTSUPP;
1027
1028         if (is_unicast_ether_addr(addr))
1029                 err = dev_uc_del(dev, addr);
1030         else if (is_multicast_ether_addr(addr))
1031                 err = dev_mc_del(dev, addr);
1032
1033         return err;
1034 }
1035
1036 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
1037                                         struct ethtool_drvinfo *drvinfo)
1038 {
1039         strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
1040         strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
1041 }
1042
1043 static int macvlan_ethtool_get_link_ksettings(struct net_device *dev,
1044                                               struct ethtool_link_ksettings *cmd)
1045 {
1046         const struct macvlan_dev *vlan = netdev_priv(dev);
1047
1048         return __ethtool_get_link_ksettings(vlan->lowerdev, cmd);
1049 }
1050
1051 static int macvlan_ethtool_get_ts_info(struct net_device *dev,
1052                                        struct ethtool_ts_info *info)
1053 {
1054         struct net_device *real_dev = macvlan_dev_real_dev(dev);
1055         const struct ethtool_ops *ops = real_dev->ethtool_ops;
1056         struct phy_device *phydev = real_dev->phydev;
1057
1058         if (phy_has_tsinfo(phydev)) {
1059                 return phy_ts_info(phydev, info);
1060         } else if (ops->get_ts_info) {
1061                 return ops->get_ts_info(real_dev, info);
1062         } else {
1063                 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
1064                         SOF_TIMESTAMPING_SOFTWARE;
1065                 info->phc_index = -1;
1066         }
1067
1068         return 0;
1069 }
1070
1071 static netdev_features_t macvlan_fix_features(struct net_device *dev,
1072                                               netdev_features_t features)
1073 {
1074         struct macvlan_dev *vlan = netdev_priv(dev);
1075         netdev_features_t lowerdev_features = vlan->lowerdev->features;
1076         netdev_features_t mask;
1077
1078         features |= NETIF_F_ALL_FOR_ALL;
1079         features &= (vlan->set_features | ~MACVLAN_FEATURES);
1080         mask = features;
1081
1082         lowerdev_features &= (features | ~NETIF_F_LRO);
1083         features = netdev_increment_features(lowerdev_features, features, mask);
1084         features |= ALWAYS_ON_FEATURES;
1085         features &= (ALWAYS_ON_FEATURES | MACVLAN_FEATURES);
1086
1087         return features;
1088 }
1089
1090 #ifdef CONFIG_NET_POLL_CONTROLLER
1091 static void macvlan_dev_poll_controller(struct net_device *dev)
1092 {
1093         return;
1094 }
1095
1096 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
1097 {
1098         struct macvlan_dev *vlan = netdev_priv(dev);
1099         struct net_device *real_dev = vlan->lowerdev;
1100         struct netpoll *netpoll;
1101         int err;
1102
1103         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
1104         err = -ENOMEM;
1105         if (!netpoll)
1106                 goto out;
1107
1108         err = __netpoll_setup(netpoll, real_dev);
1109         if (err) {
1110                 kfree(netpoll);
1111                 goto out;
1112         }
1113
1114         vlan->netpoll = netpoll;
1115
1116 out:
1117         return err;
1118 }
1119
1120 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
1121 {
1122         struct macvlan_dev *vlan = netdev_priv(dev);
1123         struct netpoll *netpoll = vlan->netpoll;
1124
1125         if (!netpoll)
1126                 return;
1127
1128         vlan->netpoll = NULL;
1129
1130         __netpoll_free(netpoll);
1131 }
1132 #endif  /* CONFIG_NET_POLL_CONTROLLER */
1133
1134 static int macvlan_dev_get_iflink(const struct net_device *dev)
1135 {
1136         struct macvlan_dev *vlan = netdev_priv(dev);
1137
1138         return vlan->lowerdev->ifindex;
1139 }
1140
1141 static const struct ethtool_ops macvlan_ethtool_ops = {
1142         .get_link               = ethtool_op_get_link,
1143         .get_link_ksettings     = macvlan_ethtool_get_link_ksettings,
1144         .get_drvinfo            = macvlan_ethtool_get_drvinfo,
1145         .get_ts_info            = macvlan_ethtool_get_ts_info,
1146 };
1147
1148 static const struct net_device_ops macvlan_netdev_ops = {
1149         .ndo_init               = macvlan_init,
1150         .ndo_uninit             = macvlan_uninit,
1151         .ndo_open               = macvlan_open,
1152         .ndo_stop               = macvlan_stop,
1153         .ndo_start_xmit         = macvlan_start_xmit,
1154         .ndo_change_mtu         = macvlan_change_mtu,
1155         .ndo_eth_ioctl          = macvlan_eth_ioctl,
1156         .ndo_fix_features       = macvlan_fix_features,
1157         .ndo_change_rx_flags    = macvlan_change_rx_flags,
1158         .ndo_set_mac_address    = macvlan_set_mac_address,
1159         .ndo_set_rx_mode        = macvlan_set_mac_lists,
1160         .ndo_get_stats64        = macvlan_dev_get_stats64,
1161         .ndo_validate_addr      = eth_validate_addr,
1162         .ndo_vlan_rx_add_vid    = macvlan_vlan_rx_add_vid,
1163         .ndo_vlan_rx_kill_vid   = macvlan_vlan_rx_kill_vid,
1164         .ndo_fdb_add            = macvlan_fdb_add,
1165         .ndo_fdb_del            = macvlan_fdb_del,
1166         .ndo_fdb_dump           = ndo_dflt_fdb_dump,
1167 #ifdef CONFIG_NET_POLL_CONTROLLER
1168         .ndo_poll_controller    = macvlan_dev_poll_controller,
1169         .ndo_netpoll_setup      = macvlan_dev_netpoll_setup,
1170         .ndo_netpoll_cleanup    = macvlan_dev_netpoll_cleanup,
1171 #endif
1172         .ndo_get_iflink         = macvlan_dev_get_iflink,
1173         .ndo_features_check     = passthru_features_check,
1174         .ndo_change_proto_down  = dev_change_proto_down_generic,
1175 };
1176
1177 void macvlan_common_setup(struct net_device *dev)
1178 {
1179         ether_setup(dev);
1180
1181         dev->min_mtu            = 0;
1182         dev->max_mtu            = ETH_MAX_MTU;
1183         dev->priv_flags        &= ~IFF_TX_SKB_SHARING;
1184         netif_keep_dst(dev);
1185         dev->priv_flags        |= IFF_UNICAST_FLT;
1186         dev->netdev_ops         = &macvlan_netdev_ops;
1187         dev->needs_free_netdev  = true;
1188         dev->header_ops         = &macvlan_hard_header_ops;
1189         dev->ethtool_ops        = &macvlan_ethtool_ops;
1190 }
1191 EXPORT_SYMBOL_GPL(macvlan_common_setup);
1192
1193 static void macvlan_setup(struct net_device *dev)
1194 {
1195         macvlan_common_setup(dev);
1196         dev->priv_flags |= IFF_NO_QUEUE;
1197 }
1198
1199 static int macvlan_port_create(struct net_device *dev)
1200 {
1201         struct macvlan_port *port;
1202         unsigned int i;
1203         int err;
1204
1205         if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1206                 return -EINVAL;
1207
1208         if (netdev_is_rx_handler_busy(dev))
1209                 return -EBUSY;
1210
1211         port = kzalloc(sizeof(*port), GFP_KERNEL);
1212         if (port == NULL)
1213                 return -ENOMEM;
1214
1215         port->dev = dev;
1216         ether_addr_copy(port->perm_addr, dev->dev_addr);
1217         INIT_LIST_HEAD(&port->vlans);
1218         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1219                 INIT_HLIST_HEAD(&port->vlan_hash[i]);
1220         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1221                 INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1222
1223         port->bc_queue_len_used = 0;
1224         skb_queue_head_init(&port->bc_queue);
1225         INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1226
1227         err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1228         if (err)
1229                 kfree(port);
1230         else
1231                 dev->priv_flags |= IFF_MACVLAN_PORT;
1232         return err;
1233 }
1234
1235 static void macvlan_port_destroy(struct net_device *dev)
1236 {
1237         struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1238         struct sk_buff *skb;
1239
1240         dev->priv_flags &= ~IFF_MACVLAN_PORT;
1241         netdev_rx_handler_unregister(dev);
1242
1243         /* After this point, no packet can schedule bc_work anymore,
1244          * but we need to cancel it and purge left skbs if any.
1245          */
1246         cancel_work_sync(&port->bc_work);
1247
1248         while ((skb = __skb_dequeue(&port->bc_queue))) {
1249                 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
1250
1251                 if (src)
1252                         dev_put(src->dev);
1253
1254                 kfree_skb(skb);
1255         }
1256
1257         /* If the lower device address has been changed by passthru
1258          * macvlan, put it back.
1259          */
1260         if (macvlan_passthru(port) &&
1261             !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) {
1262                 struct sockaddr sa;
1263
1264                 sa.sa_family = port->dev->type;
1265                 memcpy(&sa.sa_data, port->perm_addr, port->dev->addr_len);
1266                 dev_set_mac_address(port->dev, &sa, NULL);
1267         }
1268
1269         kfree(port);
1270 }
1271
1272 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[],
1273                             struct netlink_ext_ack *extack)
1274 {
1275         struct nlattr *nla, *head;
1276         int rem, len;
1277
1278         if (tb[IFLA_ADDRESS]) {
1279                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1280                         return -EINVAL;
1281                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1282                         return -EADDRNOTAVAIL;
1283         }
1284
1285         if (!data)
1286                 return 0;
1287
1288         if (data[IFLA_MACVLAN_FLAGS] &&
1289             nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~(MACVLAN_FLAG_NOPROMISC |
1290                                                       MACVLAN_FLAG_NODST))
1291                 return -EINVAL;
1292
1293         if (data[IFLA_MACVLAN_MODE]) {
1294                 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1295                 case MACVLAN_MODE_PRIVATE:
1296                 case MACVLAN_MODE_VEPA:
1297                 case MACVLAN_MODE_BRIDGE:
1298                 case MACVLAN_MODE_PASSTHRU:
1299                 case MACVLAN_MODE_SOURCE:
1300                         break;
1301                 default:
1302                         return -EINVAL;
1303                 }
1304         }
1305
1306         if (data[IFLA_MACVLAN_MACADDR_MODE]) {
1307                 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1308                 case MACVLAN_MACADDR_ADD:
1309                 case MACVLAN_MACADDR_DEL:
1310                 case MACVLAN_MACADDR_FLUSH:
1311                 case MACVLAN_MACADDR_SET:
1312                         break;
1313                 default:
1314                         return -EINVAL;
1315                 }
1316         }
1317
1318         if (data[IFLA_MACVLAN_MACADDR]) {
1319                 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1320                         return -EINVAL;
1321
1322                 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1323                         return -EADDRNOTAVAIL;
1324         }
1325
1326         if (data[IFLA_MACVLAN_MACADDR_DATA]) {
1327                 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1328                 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1329
1330                 nla_for_each_attr(nla, head, len, rem) {
1331                         if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1332                             nla_len(nla) != ETH_ALEN)
1333                                 return -EINVAL;
1334
1335                         if (!is_valid_ether_addr(nla_data(nla)))
1336                                 return -EADDRNOTAVAIL;
1337                 }
1338         }
1339
1340         if (data[IFLA_MACVLAN_MACADDR_COUNT])
1341                 return -EINVAL;
1342
1343         return 0;
1344 }
1345
1346 /*
1347  * reconfigure list of remote source mac address
1348  * (only for macvlan devices in source mode)
1349  * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1350  * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1351  */
1352 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1353                                       struct nlattr *data[])
1354 {
1355         char *addr = NULL;
1356         int ret, rem, len;
1357         struct nlattr *nla, *head;
1358         struct macvlan_source_entry *entry;
1359
1360         if (data[IFLA_MACVLAN_MACADDR])
1361                 addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1362
1363         if (mode == MACVLAN_MACADDR_ADD) {
1364                 if (!addr)
1365                         return -EINVAL;
1366
1367                 return macvlan_hash_add_source(vlan, addr);
1368
1369         } else if (mode == MACVLAN_MACADDR_DEL) {
1370                 if (!addr)
1371                         return -EINVAL;
1372
1373                 entry = macvlan_hash_lookup_source(vlan, addr);
1374                 if (entry) {
1375                         macvlan_hash_del_source(entry);
1376                         vlan->macaddr_count--;
1377                 }
1378         } else if (mode == MACVLAN_MACADDR_FLUSH) {
1379                 macvlan_flush_sources(vlan->port, vlan);
1380         } else if (mode == MACVLAN_MACADDR_SET) {
1381                 macvlan_flush_sources(vlan->port, vlan);
1382
1383                 if (addr) {
1384                         ret = macvlan_hash_add_source(vlan, addr);
1385                         if (ret)
1386                                 return ret;
1387                 }
1388
1389                 if (!data[IFLA_MACVLAN_MACADDR_DATA])
1390                         return 0;
1391
1392                 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1393                 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1394
1395                 nla_for_each_attr(nla, head, len, rem) {
1396                         addr = nla_data(nla);
1397                         ret = macvlan_hash_add_source(vlan, addr);
1398                         if (ret)
1399                                 return ret;
1400                 }
1401         } else {
1402                 return -EINVAL;
1403         }
1404
1405         return 0;
1406 }
1407
1408 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1409                            struct nlattr *tb[], struct nlattr *data[],
1410                            struct netlink_ext_ack *extack)
1411 {
1412         struct macvlan_dev *vlan = netdev_priv(dev);
1413         struct macvlan_port *port;
1414         struct net_device *lowerdev;
1415         int err;
1416         int macmode;
1417         bool create = false;
1418
1419         if (!tb[IFLA_LINK])
1420                 return -EINVAL;
1421
1422         lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1423         if (lowerdev == NULL)
1424                 return -ENODEV;
1425
1426         /* When creating macvlans or macvtaps on top of other macvlans - use
1427          * the real device as the lowerdev.
1428          */
1429         if (netif_is_macvlan(lowerdev))
1430                 lowerdev = macvlan_dev_real_dev(lowerdev);
1431
1432         if (!tb[IFLA_MTU])
1433                 dev->mtu = lowerdev->mtu;
1434         else if (dev->mtu > lowerdev->mtu)
1435                 return -EINVAL;
1436
1437         /* MTU range: 68 - lowerdev->max_mtu */
1438         dev->min_mtu = ETH_MIN_MTU;
1439         dev->max_mtu = lowerdev->max_mtu;
1440
1441         if (!tb[IFLA_ADDRESS])
1442                 eth_hw_addr_random(dev);
1443
1444         if (!netif_is_macvlan_port(lowerdev)) {
1445                 err = macvlan_port_create(lowerdev);
1446                 if (err < 0)
1447                         return err;
1448                 create = true;
1449         }
1450         port = macvlan_port_get_rtnl(lowerdev);
1451
1452         /* Only 1 macvlan device can be created in passthru mode */
1453         if (macvlan_passthru(port)) {
1454                 /* The macvlan port must be not created this time,
1455                  * still goto destroy_macvlan_port for readability.
1456                  */
1457                 err = -EINVAL;
1458                 goto destroy_macvlan_port;
1459         }
1460
1461         vlan->lowerdev = lowerdev;
1462         vlan->dev      = dev;
1463         vlan->port     = port;
1464         vlan->set_features = MACVLAN_FEATURES;
1465
1466         vlan->mode     = MACVLAN_MODE_VEPA;
1467         if (data && data[IFLA_MACVLAN_MODE])
1468                 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1469
1470         if (data && data[IFLA_MACVLAN_FLAGS])
1471                 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1472
1473         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1474                 if (port->count) {
1475                         err = -EINVAL;
1476                         goto destroy_macvlan_port;
1477                 }
1478                 macvlan_set_passthru(port);
1479                 eth_hw_addr_inherit(dev, lowerdev);
1480         }
1481
1482         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1483                 if (vlan->mode != MACVLAN_MODE_SOURCE) {
1484                         err = -EINVAL;
1485                         goto destroy_macvlan_port;
1486                 }
1487                 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1488                 err = macvlan_changelink_sources(vlan, macmode, data);
1489                 if (err)
1490                         goto destroy_macvlan_port;
1491         }
1492
1493         vlan->bc_queue_len_req = MACVLAN_DEFAULT_BC_QUEUE_LEN;
1494         if (data && data[IFLA_MACVLAN_BC_QUEUE_LEN])
1495                 vlan->bc_queue_len_req = nla_get_u32(data[IFLA_MACVLAN_BC_QUEUE_LEN]);
1496
1497         err = register_netdevice(dev);
1498         if (err < 0)
1499                 goto destroy_macvlan_port;
1500
1501         dev->priv_flags |= IFF_MACVLAN;
1502         err = netdev_upper_dev_link(lowerdev, dev, extack);
1503         if (err)
1504                 goto unregister_netdev;
1505
1506         list_add_tail_rcu(&vlan->list, &port->vlans);
1507         update_port_bc_queue_len(vlan->port);
1508         netif_stacked_transfer_operstate(lowerdev, dev);
1509         linkwatch_fire_event(dev);
1510
1511         return 0;
1512
1513 unregister_netdev:
1514         /* macvlan_uninit would free the macvlan port */
1515         unregister_netdevice(dev);
1516         return err;
1517 destroy_macvlan_port:
1518         /* the macvlan port may be freed by macvlan_uninit when fail to register.
1519          * so we destroy the macvlan port only when it's valid.
1520          */
1521         if (create && macvlan_port_get_rtnl(lowerdev))
1522                 macvlan_port_destroy(port->dev);
1523         return err;
1524 }
1525 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1526
1527 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1528                            struct nlattr *tb[], struct nlattr *data[],
1529                            struct netlink_ext_ack *extack)
1530 {
1531         return macvlan_common_newlink(src_net, dev, tb, data, extack);
1532 }
1533
1534 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1535 {
1536         struct macvlan_dev *vlan = netdev_priv(dev);
1537
1538         if (vlan->mode == MACVLAN_MODE_SOURCE)
1539                 macvlan_flush_sources(vlan->port, vlan);
1540         list_del_rcu(&vlan->list);
1541         update_port_bc_queue_len(vlan->port);
1542         unregister_netdevice_queue(dev, head);
1543         netdev_upper_dev_unlink(vlan->lowerdev, dev);
1544 }
1545 EXPORT_SYMBOL_GPL(macvlan_dellink);
1546
1547 static int macvlan_changelink(struct net_device *dev,
1548                               struct nlattr *tb[], struct nlattr *data[],
1549                               struct netlink_ext_ack *extack)
1550 {
1551         struct macvlan_dev *vlan = netdev_priv(dev);
1552         enum macvlan_mode mode;
1553         bool set_mode = false;
1554         enum macvlan_macaddr_mode macmode;
1555         int ret;
1556
1557         /* Validate mode, but don't set yet: setting flags may fail. */
1558         if (data && data[IFLA_MACVLAN_MODE]) {
1559                 set_mode = true;
1560                 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1561                 /* Passthrough mode can't be set or cleared dynamically */
1562                 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1563                     (vlan->mode == MACVLAN_MODE_PASSTHRU))
1564                         return -EINVAL;
1565                 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1566                     vlan->mode != mode)
1567                         macvlan_flush_sources(vlan->port, vlan);
1568         }
1569
1570         if (data && data[IFLA_MACVLAN_FLAGS]) {
1571                 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1572                 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1573                 if (macvlan_passthru(vlan->port) && promisc) {
1574                         int err;
1575
1576                         if (flags & MACVLAN_FLAG_NOPROMISC)
1577                                 err = dev_set_promiscuity(vlan->lowerdev, -1);
1578                         else
1579                                 err = dev_set_promiscuity(vlan->lowerdev, 1);
1580                         if (err < 0)
1581                                 return err;
1582                 }
1583                 vlan->flags = flags;
1584         }
1585
1586         if (data && data[IFLA_MACVLAN_BC_QUEUE_LEN]) {
1587                 vlan->bc_queue_len_req = nla_get_u32(data[IFLA_MACVLAN_BC_QUEUE_LEN]);
1588                 update_port_bc_queue_len(vlan->port);
1589         }
1590
1591         if (set_mode)
1592                 vlan->mode = mode;
1593         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1594                 if (vlan->mode != MACVLAN_MODE_SOURCE)
1595                         return -EINVAL;
1596                 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1597                 ret = macvlan_changelink_sources(vlan, macmode, data);
1598                 if (ret)
1599                         return ret;
1600         }
1601         return 0;
1602 }
1603
1604 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1605 {
1606         if (vlan->macaddr_count == 0)
1607                 return 0;
1608         return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1609                 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1610 }
1611
1612 static size_t macvlan_get_size(const struct net_device *dev)
1613 {
1614         struct macvlan_dev *vlan = netdev_priv(dev);
1615
1616         return (0
1617                 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1618                 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1619                 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1620                 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1621                 + nla_total_size(4) /* IFLA_MACVLAN_BC_QUEUE_LEN */
1622                 + nla_total_size(4) /* IFLA_MACVLAN_BC_QUEUE_LEN_USED */
1623                 );
1624 }
1625
1626 static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1627                                      const struct macvlan_dev *vlan,
1628                                      const int i)
1629 {
1630         struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1631         struct macvlan_source_entry *entry;
1632
1633         hlist_for_each_entry_rcu(entry, h, hlist) {
1634                 if (entry->vlan != vlan)
1635                         continue;
1636                 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1637                         return 1;
1638         }
1639         return 0;
1640 }
1641
1642 static int macvlan_fill_info(struct sk_buff *skb,
1643                                 const struct net_device *dev)
1644 {
1645         struct macvlan_dev *vlan = netdev_priv(dev);
1646         struct macvlan_port *port = vlan->port;
1647         int i;
1648         struct nlattr *nest;
1649
1650         if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1651                 goto nla_put_failure;
1652         if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1653                 goto nla_put_failure;
1654         if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1655                 goto nla_put_failure;
1656         if (vlan->macaddr_count > 0) {
1657                 nest = nla_nest_start_noflag(skb, IFLA_MACVLAN_MACADDR_DATA);
1658                 if (nest == NULL)
1659                         goto nla_put_failure;
1660
1661                 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1662                         if (macvlan_fill_info_macaddr(skb, vlan, i))
1663                                 goto nla_put_failure;
1664                 }
1665                 nla_nest_end(skb, nest);
1666         }
1667         if (nla_put_u32(skb, IFLA_MACVLAN_BC_QUEUE_LEN, vlan->bc_queue_len_req))
1668                 goto nla_put_failure;
1669         if (nla_put_u32(skb, IFLA_MACVLAN_BC_QUEUE_LEN_USED, port->bc_queue_len_used))
1670                 goto nla_put_failure;
1671         return 0;
1672
1673 nla_put_failure:
1674         return -EMSGSIZE;
1675 }
1676
1677 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1678         [IFLA_MACVLAN_MODE]  = { .type = NLA_U32 },
1679         [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1680         [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1681         [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1682         [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1683         [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1684         [IFLA_MACVLAN_BC_QUEUE_LEN] = { .type = NLA_U32 },
1685         [IFLA_MACVLAN_BC_QUEUE_LEN_USED] = { .type = NLA_REJECT },
1686 };
1687
1688 int macvlan_link_register(struct rtnl_link_ops *ops)
1689 {
1690         /* common fields */
1691         ops->validate           = macvlan_validate;
1692         ops->maxtype            = IFLA_MACVLAN_MAX;
1693         ops->policy             = macvlan_policy;
1694         ops->changelink         = macvlan_changelink;
1695         ops->get_size           = macvlan_get_size;
1696         ops->fill_info          = macvlan_fill_info;
1697
1698         return rtnl_link_register(ops);
1699 };
1700 EXPORT_SYMBOL_GPL(macvlan_link_register);
1701
1702 static struct net *macvlan_get_link_net(const struct net_device *dev)
1703 {
1704         return dev_net(macvlan_dev_real_dev(dev));
1705 }
1706
1707 static struct rtnl_link_ops macvlan_link_ops = {
1708         .kind           = "macvlan",
1709         .setup          = macvlan_setup,
1710         .newlink        = macvlan_newlink,
1711         .dellink        = macvlan_dellink,
1712         .get_link_net   = macvlan_get_link_net,
1713         .priv_size      = sizeof(struct macvlan_dev),
1714 };
1715
1716 static void update_port_bc_queue_len(struct macvlan_port *port)
1717 {
1718         u32 max_bc_queue_len_req = 0;
1719         struct macvlan_dev *vlan;
1720
1721         list_for_each_entry(vlan, &port->vlans, list) {
1722                 if (vlan->bc_queue_len_req > max_bc_queue_len_req)
1723                         max_bc_queue_len_req = vlan->bc_queue_len_req;
1724         }
1725         port->bc_queue_len_used = max_bc_queue_len_req;
1726 }
1727
1728 static int macvlan_device_event(struct notifier_block *unused,
1729                                 unsigned long event, void *ptr)
1730 {
1731         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1732         struct macvlan_dev *vlan, *next;
1733         struct macvlan_port *port;
1734         LIST_HEAD(list_kill);
1735
1736         if (!netif_is_macvlan_port(dev))
1737                 return NOTIFY_DONE;
1738
1739         port = macvlan_port_get_rtnl(dev);
1740
1741         switch (event) {
1742         case NETDEV_UP:
1743         case NETDEV_DOWN:
1744         case NETDEV_CHANGE:
1745                 list_for_each_entry(vlan, &port->vlans, list)
1746                         netif_stacked_transfer_operstate(vlan->lowerdev,
1747                                                          vlan->dev);
1748                 break;
1749         case NETDEV_FEAT_CHANGE:
1750                 list_for_each_entry(vlan, &port->vlans, list) {
1751                         vlan->dev->gso_max_size = dev->gso_max_size;
1752                         vlan->dev->gso_max_segs = dev->gso_max_segs;
1753                         netdev_update_features(vlan->dev);
1754                 }
1755                 break;
1756         case NETDEV_CHANGEMTU:
1757                 list_for_each_entry(vlan, &port->vlans, list) {
1758                         if (vlan->dev->mtu <= dev->mtu)
1759                                 continue;
1760                         dev_set_mtu(vlan->dev, dev->mtu);
1761                 }
1762                 break;
1763         case NETDEV_CHANGEADDR:
1764                 if (!macvlan_passthru(port))
1765                         return NOTIFY_DONE;
1766
1767                 vlan = list_first_entry_or_null(&port->vlans,
1768                                                 struct macvlan_dev,
1769                                                 list);
1770
1771                 if (vlan && macvlan_sync_address(vlan->dev, dev->dev_addr))
1772                         return NOTIFY_BAD;
1773
1774                 break;
1775         case NETDEV_UNREGISTER:
1776                 /* twiddle thumbs on netns device moves */
1777                 if (dev->reg_state != NETREG_UNREGISTERING)
1778                         break;
1779
1780                 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1781                         vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1782                 unregister_netdevice_many(&list_kill);
1783                 break;
1784         case NETDEV_PRE_TYPE_CHANGE:
1785                 /* Forbid underlying device to change its type. */
1786                 return NOTIFY_BAD;
1787
1788         case NETDEV_NOTIFY_PEERS:
1789         case NETDEV_BONDING_FAILOVER:
1790         case NETDEV_RESEND_IGMP:
1791                 /* Propagate to all vlans */
1792                 list_for_each_entry(vlan, &port->vlans, list)
1793                         call_netdevice_notifiers(event, vlan->dev);
1794         }
1795         return NOTIFY_DONE;
1796 }
1797
1798 static struct notifier_block macvlan_notifier_block __read_mostly = {
1799         .notifier_call  = macvlan_device_event,
1800 };
1801
1802 static int __init macvlan_init_module(void)
1803 {
1804         int err;
1805
1806         register_netdevice_notifier(&macvlan_notifier_block);
1807
1808         err = macvlan_link_register(&macvlan_link_ops);
1809         if (err < 0)
1810                 goto err1;
1811         return 0;
1812 err1:
1813         unregister_netdevice_notifier(&macvlan_notifier_block);
1814         return err;
1815 }
1816
1817 static void __exit macvlan_cleanup_module(void)
1818 {
1819         rtnl_link_unregister(&macvlan_link_ops);
1820         unregister_netdevice_notifier(&macvlan_notifier_block);
1821 }
1822
1823 module_init(macvlan_init_module);
1824 module_exit(macvlan_cleanup_module);
1825
1826 MODULE_LICENSE("GPL");
1827 MODULE_AUTHOR("Patrick McHardy <[email protected]>");
1828 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1829 MODULE_ALIAS_RTNL_LINK("macvlan");