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                         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         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         netif_set_gso_max_size(dev, lowerdev->gso_max_size);
 904         netif_set_gso_max_segs(dev, 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         /* Get macvlan's reference to lowerdev */
 915         dev_hold_track(lowerdev, &vlan->dev_tracker, GFP_KERNEL);
 916
 917         return 0;
 918 }
 919
 920 static void macvlan_uninit(struct net_device *dev)
 921 {
 922         struct macvlan_dev *vlan = netdev_priv(dev);
 923         struct macvlan_port *port = vlan->port;
 924
 925         free_percpu(vlan->pcpu_stats);
 926
 927         macvlan_flush_sources(port, vlan);
 928         port->count -= 1;
 929         if (!port->count)
 930                 macvlan_port_destroy(port->dev);
 931 }
 932
 933 static void macvlan_dev_get_stats64(struct net_device *dev,
 934                                     struct rtnl_link_stats64 *stats)
 935 {
 936         struct macvlan_dev *vlan = netdev_priv(dev);
 937
 938         if (vlan->pcpu_stats) {
 939                 struct vlan_pcpu_stats *p;
 940                 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
 941                 u32 rx_errors = 0, tx_dropped = 0;
 942                 unsigned int start;
 943                 int i;
 944
 945                 for_each_possible_cpu(i) {
 946                         p = per_cpu_ptr(vlan->pcpu_stats, i);
 947                         do {
 948                                 start = u64_stats_fetch_begin_irq(&p->syncp);
 949                                 rx_packets      = p->rx_packets;
 950                                 rx_bytes        = p->rx_bytes;
 951                                 rx_multicast    = p->rx_multicast;
 952                                 tx_packets      = p->tx_packets;
 953                                 tx_bytes        = p->tx_bytes;
 954                         } while (u64_stats_fetch_retry_irq(&p->syncp, start));
 955
 956                         stats->rx_packets       += rx_packets;
 957                         stats->rx_bytes         += rx_bytes;
 958                         stats->multicast        += rx_multicast;
 959                         stats->tx_packets       += tx_packets;
 960                         stats->tx_bytes         += tx_bytes;
 961                         /* rx_errors & tx_dropped are u32, updated
 962                          * without syncp protection.
 963                          */
 964                         rx_errors       += p->rx_errors;
 965                         tx_dropped      += p->tx_dropped;
 966                 }
 967                 stats->rx_errors        = rx_errors;
 968                 stats->rx_dropped       = rx_errors;
 969                 stats->tx_dropped       = tx_dropped;
 970         }
 971 }
 972
 973 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
 974                                    __be16 proto, u16 vid)
 975 {
 976         struct macvlan_dev *vlan = netdev_priv(dev);
 977         struct net_device *lowerdev = vlan->lowerdev;
 978
 979         return vlan_vid_add(lowerdev, proto, vid);
 980 }
 981
 982 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
 983                                     __be16 proto, u16 vid)
 984 {
 985         struct macvlan_dev *vlan = netdev_priv(dev);
 986         struct net_device *lowerdev = vlan->lowerdev;
 987
 988         vlan_vid_del(lowerdev, proto, vid);
 989         return 0;
 990 }
 991
 992 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 993                            struct net_device *dev,
 994                            const unsigned char *addr, u16 vid,
 995                            u16 flags,
 996                            struct netlink_ext_ack *extack)
 997 {
 998         struct macvlan_dev *vlan = netdev_priv(dev);
 999         int err = -EINVAL;
1000
1001         /* Support unicast filter only on passthru devices.
1002          * Multicast filter should be allowed on all devices.
1003          */
1004         if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
1005                 return -EOPNOTSUPP;
1006
1007         if (flags & NLM_F_REPLACE)
1008                 return -EOPNOTSUPP;
1009
1010         if (is_unicast_ether_addr(addr))
1011                 err = dev_uc_add_excl(dev, addr);
1012         else if (is_multicast_ether_addr(addr))
1013                 err = dev_mc_add_excl(dev, addr);
1014
1015         return err;
1016 }
1017
1018 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
1019                            struct net_device *dev,
1020                            const unsigned char *addr, u16 vid)
1021 {
1022         struct macvlan_dev *vlan = netdev_priv(dev);
1023         int err = -EINVAL;
1024
1025         /* Support unicast filter only on passthru devices.
1026          * Multicast filter should be allowed on all devices.
1027          */
1028         if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
1029                 return -EOPNOTSUPP;
1030
1031         if (is_unicast_ether_addr(addr))
1032                 err = dev_uc_del(dev, addr);
1033         else if (is_multicast_ether_addr(addr))
1034                 err = dev_mc_del(dev, addr);
1035
1036         return err;
1037 }
1038
1039 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
1040                                         struct ethtool_drvinfo *drvinfo)
1041 {
1042         strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
1043         strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
1044 }
1045
1046 static int macvlan_ethtool_get_link_ksettings(struct net_device *dev,
1047                                               struct ethtool_link_ksettings *cmd)
1048 {
1049         const struct macvlan_dev *vlan = netdev_priv(dev);
1050
1051         return __ethtool_get_link_ksettings(vlan->lowerdev, cmd);
1052 }
1053
1054 static int macvlan_ethtool_get_ts_info(struct net_device *dev,
1055                                        struct ethtool_ts_info *info)
1056 {
1057         struct net_device *real_dev = macvlan_dev_real_dev(dev);
1058         const struct ethtool_ops *ops = real_dev->ethtool_ops;
1059         struct phy_device *phydev = real_dev->phydev;
1060
1061         if (phy_has_tsinfo(phydev)) {
1062                 return phy_ts_info(phydev, info);
1063         } else if (ops->get_ts_info) {
1064                 return ops->get_ts_info(real_dev, info);
1065         } else {
1066                 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
1067                         SOF_TIMESTAMPING_SOFTWARE;
1068                 info->phc_index = -1;
1069         }
1070
1071         return 0;
1072 }
1073
1074 static netdev_features_t macvlan_fix_features(struct net_device *dev,
1075                                               netdev_features_t features)
1076 {
1077         struct macvlan_dev *vlan = netdev_priv(dev);
1078         netdev_features_t lowerdev_features = vlan->lowerdev->features;
1079         netdev_features_t mask;
1080
1081         features |= NETIF_F_ALL_FOR_ALL;
1082         features &= (vlan->set_features | ~MACVLAN_FEATURES);
1083         mask = features;
1084
1085         lowerdev_features &= (features | ~NETIF_F_LRO);
1086         features = netdev_increment_features(lowerdev_features, features, mask);
1087         features |= ALWAYS_ON_FEATURES;
1088         features &= (ALWAYS_ON_FEATURES | MACVLAN_FEATURES);
1089
1090         return features;
1091 }
1092
1093 #ifdef CONFIG_NET_POLL_CONTROLLER
1094 static void macvlan_dev_poll_controller(struct net_device *dev)
1095 {
1096         return;
1097 }
1098
1099 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
1100 {
1101         struct macvlan_dev *vlan = netdev_priv(dev);
1102         struct net_device *real_dev = vlan->lowerdev;
1103         struct netpoll *netpoll;
1104         int err;
1105
1106         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
1107         err = -ENOMEM;
1108         if (!netpoll)
1109                 goto out;
1110
1111         err = __netpoll_setup(netpoll, real_dev);
1112         if (err) {
1113                 kfree(netpoll);
1114                 goto out;
1115         }
1116
1117         vlan->netpoll = netpoll;
1118
1119 out:
1120         return err;
1121 }
1122
1123 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
1124 {
1125         struct macvlan_dev *vlan = netdev_priv(dev);
1126         struct netpoll *netpoll = vlan->netpoll;
1127
1128         if (!netpoll)
1129                 return;
1130
1131         vlan->netpoll = NULL;
1132
1133         __netpoll_free(netpoll);
1134 }
1135 #endif  /* CONFIG_NET_POLL_CONTROLLER */
1136
1137 static int macvlan_dev_get_iflink(const struct net_device *dev)
1138 {
1139         struct macvlan_dev *vlan = netdev_priv(dev);
1140
1141         return vlan->lowerdev->ifindex;
1142 }
1143
1144 static const struct ethtool_ops macvlan_ethtool_ops = {
1145         .get_link               = ethtool_op_get_link,
1146         .get_link_ksettings     = macvlan_ethtool_get_link_ksettings,
1147         .get_drvinfo            = macvlan_ethtool_get_drvinfo,
1148         .get_ts_info            = macvlan_ethtool_get_ts_info,
1149 };
1150
1151 static const struct net_device_ops macvlan_netdev_ops = {
1152         .ndo_init               = macvlan_init,
1153         .ndo_uninit             = macvlan_uninit,
1154         .ndo_open               = macvlan_open,
1155         .ndo_stop               = macvlan_stop,
1156         .ndo_start_xmit         = macvlan_start_xmit,
1157         .ndo_change_mtu         = macvlan_change_mtu,
1158         .ndo_eth_ioctl          = macvlan_eth_ioctl,
1159         .ndo_fix_features       = macvlan_fix_features,
1160         .ndo_change_rx_flags    = macvlan_change_rx_flags,
1161         .ndo_set_mac_address    = macvlan_set_mac_address,
1162         .ndo_set_rx_mode        = macvlan_set_mac_lists,
1163         .ndo_get_stats64        = macvlan_dev_get_stats64,
1164         .ndo_validate_addr      = eth_validate_addr,
1165         .ndo_vlan_rx_add_vid    = macvlan_vlan_rx_add_vid,
1166         .ndo_vlan_rx_kill_vid   = macvlan_vlan_rx_kill_vid,
1167         .ndo_fdb_add            = macvlan_fdb_add,
1168         .ndo_fdb_del            = macvlan_fdb_del,
1169         .ndo_fdb_dump           = ndo_dflt_fdb_dump,
1170 #ifdef CONFIG_NET_POLL_CONTROLLER
1171         .ndo_poll_controller    = macvlan_dev_poll_controller,
1172         .ndo_netpoll_setup      = macvlan_dev_netpoll_setup,
1173         .ndo_netpoll_cleanup    = macvlan_dev_netpoll_cleanup,
1174 #endif
1175         .ndo_get_iflink         = macvlan_dev_get_iflink,
1176         .ndo_features_check     = passthru_features_check,
1177 };
1178
1179 static void macvlan_dev_free(struct net_device *dev)
1180 {
1181         struct macvlan_dev *vlan = netdev_priv(dev);
1182
1183         /* Get rid of the macvlan's reference to lowerdev */
1184         dev_put_track(vlan->lowerdev, &vlan->dev_tracker);
1185 }
1186
1187 void macvlan_common_setup(struct net_device *dev)
1188 {
1189         ether_setup(dev);
1190
1191         dev->min_mtu            = 0;
1192         dev->max_mtu            = ETH_MAX_MTU;
1193         dev->priv_flags        &= ~IFF_TX_SKB_SHARING;
1194         netif_keep_dst(dev);
1195         dev->priv_flags        |= IFF_UNICAST_FLT | IFF_CHANGE_PROTO_DOWN;
1196         dev->netdev_ops         = &macvlan_netdev_ops;
1197         dev->needs_free_netdev  = true;
1198         dev->priv_destructor    = macvlan_dev_free;
1199         dev->header_ops         = &macvlan_hard_header_ops;
1200         dev->ethtool_ops        = &macvlan_ethtool_ops;
1201 }
1202 EXPORT_SYMBOL_GPL(macvlan_common_setup);
1203
1204 static void macvlan_setup(struct net_device *dev)
1205 {
1206         macvlan_common_setup(dev);
1207         dev->priv_flags |= IFF_NO_QUEUE;
1208 }
1209
1210 static int macvlan_port_create(struct net_device *dev)
1211 {
1212         struct macvlan_port *port;
1213         unsigned int i;
1214         int err;
1215
1216         if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1217                 return -EINVAL;
1218
1219         if (netdev_is_rx_handler_busy(dev))
1220                 return -EBUSY;
1221
1222         port = kzalloc(sizeof(*port), GFP_KERNEL);
1223         if (port == NULL)
1224                 return -ENOMEM;
1225
1226         port->dev = dev;
1227         ether_addr_copy(port->perm_addr, dev->dev_addr);
1228         INIT_LIST_HEAD(&port->vlans);
1229         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1230                 INIT_HLIST_HEAD(&port->vlan_hash[i]);
1231         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1232                 INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1233
1234         port->bc_queue_len_used = 0;
1235         skb_queue_head_init(&port->bc_queue);
1236         INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1237
1238         err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1239         if (err)
1240                 kfree(port);
1241         else
1242                 dev->priv_flags |= IFF_MACVLAN_PORT;
1243         return err;
1244 }
1245
1246 static void macvlan_port_destroy(struct net_device *dev)
1247 {
1248         struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1249         struct sk_buff *skb;
1250
1251         dev->priv_flags &= ~IFF_MACVLAN_PORT;
1252         netdev_rx_handler_unregister(dev);
1253
1254         /* After this point, no packet can schedule bc_work anymore,
1255          * but we need to cancel it and purge left skbs if any.
1256          */
1257         cancel_work_sync(&port->bc_work);
1258
1259         while ((skb = __skb_dequeue(&port->bc_queue))) {
1260                 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
1261
1262                 if (src)
1263                         dev_put(src->dev);
1264
1265                 kfree_skb(skb);
1266         }
1267
1268         /* If the lower device address has been changed by passthru
1269          * macvlan, put it back.
1270          */
1271         if (macvlan_passthru(port) &&
1272             !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) {
1273                 struct sockaddr sa;
1274
1275                 sa.sa_family = port->dev->type;
1276                 memcpy(&sa.sa_data, port->perm_addr, port->dev->addr_len);
1277                 dev_set_mac_address(port->dev, &sa, NULL);
1278         }
1279
1280         kfree(port);
1281 }
1282
1283 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[],
1284                             struct netlink_ext_ack *extack)
1285 {
1286         struct nlattr *nla, *head;
1287         int rem, len;
1288
1289         if (tb[IFLA_ADDRESS]) {
1290                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1291                         return -EINVAL;
1292                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1293                         return -EADDRNOTAVAIL;
1294         }
1295
1296         if (!data)
1297                 return 0;
1298
1299         if (data[IFLA_MACVLAN_FLAGS] &&
1300             nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~(MACVLAN_FLAG_NOPROMISC |
1301                                                       MACVLAN_FLAG_NODST))
1302                 return -EINVAL;
1303
1304         if (data[IFLA_MACVLAN_MODE]) {
1305                 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1306                 case MACVLAN_MODE_PRIVATE:
1307                 case MACVLAN_MODE_VEPA:
1308                 case MACVLAN_MODE_BRIDGE:
1309                 case MACVLAN_MODE_PASSTHRU:
1310                 case MACVLAN_MODE_SOURCE:
1311                         break;
1312                 default:
1313                         return -EINVAL;
1314                 }
1315         }
1316
1317         if (data[IFLA_MACVLAN_MACADDR_MODE]) {
1318                 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1319                 case MACVLAN_MACADDR_ADD:
1320                 case MACVLAN_MACADDR_DEL:
1321                 case MACVLAN_MACADDR_FLUSH:
1322                 case MACVLAN_MACADDR_SET:
1323                         break;
1324                 default:
1325                         return -EINVAL;
1326                 }
1327         }
1328
1329         if (data[IFLA_MACVLAN_MACADDR]) {
1330                 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1331                         return -EINVAL;
1332
1333                 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1334                         return -EADDRNOTAVAIL;
1335         }
1336
1337         if (data[IFLA_MACVLAN_MACADDR_DATA]) {
1338                 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1339                 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1340
1341                 nla_for_each_attr(nla, head, len, rem) {
1342                         if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1343                             nla_len(nla) != ETH_ALEN)
1344                                 return -EINVAL;
1345
1346                         if (!is_valid_ether_addr(nla_data(nla)))
1347                                 return -EADDRNOTAVAIL;
1348                 }
1349         }
1350
1351         if (data[IFLA_MACVLAN_MACADDR_COUNT])
1352                 return -EINVAL;
1353
1354         return 0;
1355 }
1356
1357 /*
1358  * reconfigure list of remote source mac address
1359  * (only for macvlan devices in source mode)
1360  * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1361  * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1362  */
1363 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1364                                       struct nlattr *data[])
1365 {
1366         char *addr = NULL;
1367         int ret, rem, len;
1368         struct nlattr *nla, *head;
1369         struct macvlan_source_entry *entry;
1370
1371         if (data[IFLA_MACVLAN_MACADDR])
1372                 addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1373
1374         if (mode == MACVLAN_MACADDR_ADD) {
1375                 if (!addr)
1376                         return -EINVAL;
1377
1378                 return macvlan_hash_add_source(vlan, addr);
1379
1380         } else if (mode == MACVLAN_MACADDR_DEL) {
1381                 if (!addr)
1382                         return -EINVAL;
1383
1384                 entry = macvlan_hash_lookup_source(vlan, addr);
1385                 if (entry) {
1386                         macvlan_hash_del_source(entry);
1387                         vlan->macaddr_count--;
1388                 }
1389         } else if (mode == MACVLAN_MACADDR_FLUSH) {
1390                 macvlan_flush_sources(vlan->port, vlan);
1391         } else if (mode == MACVLAN_MACADDR_SET) {
1392                 macvlan_flush_sources(vlan->port, vlan);
1393
1394                 if (addr) {
1395                         ret = macvlan_hash_add_source(vlan, addr);
1396                         if (ret)
1397                                 return ret;
1398                 }
1399
1400                 if (!data[IFLA_MACVLAN_MACADDR_DATA])
1401                         return 0;
1402
1403                 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1404                 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1405
1406                 nla_for_each_attr(nla, head, len, rem) {
1407                         addr = nla_data(nla);
1408                         ret = macvlan_hash_add_source(vlan, addr);
1409                         if (ret)
1410                                 return ret;
1411                 }
1412         } else {
1413                 return -EINVAL;
1414         }
1415
1416         return 0;
1417 }
1418
1419 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1420                            struct nlattr *tb[], struct nlattr *data[],
1421                            struct netlink_ext_ack *extack)
1422 {
1423         struct macvlan_dev *vlan = netdev_priv(dev);
1424         struct macvlan_port *port;
1425         struct net_device *lowerdev;
1426         int err;
1427         int macmode;
1428         bool create = false;
1429
1430         if (!tb[IFLA_LINK])
1431                 return -EINVAL;
1432
1433         lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1434         if (lowerdev == NULL)
1435                 return -ENODEV;
1436
1437         /* When creating macvlans or macvtaps on top of other macvlans - use
1438          * the real device as the lowerdev.
1439          */
1440         if (netif_is_macvlan(lowerdev))
1441                 lowerdev = macvlan_dev_real_dev(lowerdev);
1442
1443         if (!tb[IFLA_MTU])
1444                 dev->mtu = lowerdev->mtu;
1445         else if (dev->mtu > lowerdev->mtu)
1446                 return -EINVAL;
1447
1448         /* MTU range: 68 - lowerdev->max_mtu */
1449         dev->min_mtu = ETH_MIN_MTU;
1450         dev->max_mtu = lowerdev->max_mtu;
1451
1452         if (!tb[IFLA_ADDRESS])
1453                 eth_hw_addr_random(dev);
1454
1455         if (!netif_is_macvlan_port(lowerdev)) {
1456                 err = macvlan_port_create(lowerdev);
1457                 if (err < 0)
1458                         return err;
1459                 create = true;
1460         }
1461         port = macvlan_port_get_rtnl(lowerdev);
1462
1463         /* Only 1 macvlan device can be created in passthru mode */
1464         if (macvlan_passthru(port)) {
1465                 /* The macvlan port must be not created this time,
1466                  * still goto destroy_macvlan_port for readability.
1467                  */
1468                 err = -EINVAL;
1469                 goto destroy_macvlan_port;
1470         }
1471
1472         vlan->lowerdev = lowerdev;
1473         vlan->dev      = dev;
1474         vlan->port     = port;
1475         vlan->set_features = MACVLAN_FEATURES;
1476
1477         vlan->mode     = MACVLAN_MODE_VEPA;
1478         if (data && data[IFLA_MACVLAN_MODE])
1479                 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1480
1481         if (data && data[IFLA_MACVLAN_FLAGS])
1482                 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1483
1484         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1485                 if (port->count) {
1486                         err = -EINVAL;
1487                         goto destroy_macvlan_port;
1488                 }
1489                 macvlan_set_passthru(port);
1490                 eth_hw_addr_inherit(dev, lowerdev);
1491         }
1492
1493         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1494                 if (vlan->mode != MACVLAN_MODE_SOURCE) {
1495                         err = -EINVAL;
1496                         goto destroy_macvlan_port;
1497                 }
1498                 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1499                 err = macvlan_changelink_sources(vlan, macmode, data);
1500                 if (err)
1501                         goto destroy_macvlan_port;
1502         }
1503
1504         vlan->bc_queue_len_req = MACVLAN_DEFAULT_BC_QUEUE_LEN;
1505         if (data && data[IFLA_MACVLAN_BC_QUEUE_LEN])
1506                 vlan->bc_queue_len_req = nla_get_u32(data[IFLA_MACVLAN_BC_QUEUE_LEN]);
1507
1508         err = register_netdevice(dev);
1509         if (err < 0)
1510                 goto destroy_macvlan_port;
1511
1512         dev->priv_flags |= IFF_MACVLAN;
1513         err = netdev_upper_dev_link(lowerdev, dev, extack);
1514         if (err)
1515                 goto unregister_netdev;
1516
1517         list_add_tail_rcu(&vlan->list, &port->vlans);
1518         update_port_bc_queue_len(vlan->port);
1519         netif_stacked_transfer_operstate(lowerdev, dev);
1520         linkwatch_fire_event(dev);
1521
1522         return 0;
1523
1524 unregister_netdev:
1525         /* macvlan_uninit would free the macvlan port */
1526         unregister_netdevice(dev);
1527         return err;
1528 destroy_macvlan_port:
1529         /* the macvlan port may be freed by macvlan_uninit when fail to register.
1530          * so we destroy the macvlan port only when it's valid.
1531          */
1532         if (create && macvlan_port_get_rtnl(lowerdev))
1533                 macvlan_port_destroy(port->dev);
1534         return err;
1535 }
1536 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1537
1538 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1539                            struct nlattr *tb[], struct nlattr *data[],
1540                            struct netlink_ext_ack *extack)
1541 {
1542         return macvlan_common_newlink(src_net, dev, tb, data, extack);
1543 }
1544
1545 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1546 {
1547         struct macvlan_dev *vlan = netdev_priv(dev);
1548
1549         if (vlan->mode == MACVLAN_MODE_SOURCE)
1550                 macvlan_flush_sources(vlan->port, vlan);
1551         list_del_rcu(&vlan->list);
1552         update_port_bc_queue_len(vlan->port);
1553         unregister_netdevice_queue(dev, head);
1554         netdev_upper_dev_unlink(vlan->lowerdev, dev);
1555 }
1556 EXPORT_SYMBOL_GPL(macvlan_dellink);
1557
1558 static int macvlan_changelink(struct net_device *dev,
1559                               struct nlattr *tb[], struct nlattr *data[],
1560                               struct netlink_ext_ack *extack)
1561 {
1562         struct macvlan_dev *vlan = netdev_priv(dev);
1563         enum macvlan_mode mode;
1564         bool set_mode = false;
1565         enum macvlan_macaddr_mode macmode;
1566         int ret;
1567
1568         /* Validate mode, but don't set yet: setting flags may fail. */
1569         if (data && data[IFLA_MACVLAN_MODE]) {
1570                 set_mode = true;
1571                 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1572                 /* Passthrough mode can't be set or cleared dynamically */
1573                 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1574                     (vlan->mode == MACVLAN_MODE_PASSTHRU))
1575                         return -EINVAL;
1576                 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1577                     vlan->mode != mode)
1578                         macvlan_flush_sources(vlan->port, vlan);
1579         }
1580
1581         if (data && data[IFLA_MACVLAN_FLAGS]) {
1582                 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1583                 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1584                 if (macvlan_passthru(vlan->port) && promisc) {
1585                         int err;
1586
1587                         if (flags & MACVLAN_FLAG_NOPROMISC)
1588                                 err = dev_set_promiscuity(vlan->lowerdev, -1);
1589                         else
1590                                 err = dev_set_promiscuity(vlan->lowerdev, 1);
1591                         if (err < 0)
1592                                 return err;
1593                 }
1594                 vlan->flags = flags;
1595         }
1596
1597         if (data && data[IFLA_MACVLAN_BC_QUEUE_LEN]) {
1598                 vlan->bc_queue_len_req = nla_get_u32(data[IFLA_MACVLAN_BC_QUEUE_LEN]);
1599                 update_port_bc_queue_len(vlan->port);
1600         }
1601
1602         if (set_mode)
1603                 vlan->mode = mode;
1604         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1605                 if (vlan->mode != MACVLAN_MODE_SOURCE)
1606                         return -EINVAL;
1607                 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1608                 ret = macvlan_changelink_sources(vlan, macmode, data);
1609                 if (ret)
1610                         return ret;
1611         }
1612         return 0;
1613 }
1614
1615 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1616 {
1617         if (vlan->macaddr_count == 0)
1618                 return 0;
1619         return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1620                 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1621 }
1622
1623 static size_t macvlan_get_size(const struct net_device *dev)
1624 {
1625         struct macvlan_dev *vlan = netdev_priv(dev);
1626
1627         return (0
1628                 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1629                 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1630                 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1631                 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1632                 + nla_total_size(4) /* IFLA_MACVLAN_BC_QUEUE_LEN */
1633                 + nla_total_size(4) /* IFLA_MACVLAN_BC_QUEUE_LEN_USED */
1634                 );
1635 }
1636
1637 static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1638                                      const struct macvlan_dev *vlan,
1639                                      const int i)
1640 {
1641         struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1642         struct macvlan_source_entry *entry;
1643
1644         hlist_for_each_entry_rcu(entry, h, hlist) {
1645                 if (entry->vlan != vlan)
1646                         continue;
1647                 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1648                         return 1;
1649         }
1650         return 0;
1651 }
1652
1653 static int macvlan_fill_info(struct sk_buff *skb,
1654                                 const struct net_device *dev)
1655 {
1656         struct macvlan_dev *vlan = netdev_priv(dev);
1657         struct macvlan_port *port = vlan->port;
1658         int i;
1659         struct nlattr *nest;
1660
1661         if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1662                 goto nla_put_failure;
1663         if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1664                 goto nla_put_failure;
1665         if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1666                 goto nla_put_failure;
1667         if (vlan->macaddr_count > 0) {
1668                 nest = nla_nest_start_noflag(skb, IFLA_MACVLAN_MACADDR_DATA);
1669                 if (nest == NULL)
1670                         goto nla_put_failure;
1671
1672                 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1673                         if (macvlan_fill_info_macaddr(skb, vlan, i))
1674                                 goto nla_put_failure;
1675                 }
1676                 nla_nest_end(skb, nest);
1677         }
1678         if (nla_put_u32(skb, IFLA_MACVLAN_BC_QUEUE_LEN, vlan->bc_queue_len_req))
1679                 goto nla_put_failure;
1680         if (nla_put_u32(skb, IFLA_MACVLAN_BC_QUEUE_LEN_USED, port->bc_queue_len_used))
1681                 goto nla_put_failure;
1682         return 0;
1683
1684 nla_put_failure:
1685         return -EMSGSIZE;
1686 }
1687
1688 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1689         [IFLA_MACVLAN_MODE]  = { .type = NLA_U32 },
1690         [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1691         [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1692         [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1693         [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1694         [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1695         [IFLA_MACVLAN_BC_QUEUE_LEN] = { .type = NLA_U32 },
1696         [IFLA_MACVLAN_BC_QUEUE_LEN_USED] = { .type = NLA_REJECT },
1697 };
1698
1699 int macvlan_link_register(struct rtnl_link_ops *ops)
1700 {
1701         /* common fields */
1702         ops->validate           = macvlan_validate;
1703         ops->maxtype            = IFLA_MACVLAN_MAX;
1704         ops->policy             = macvlan_policy;
1705         ops->changelink         = macvlan_changelink;
1706         ops->get_size           = macvlan_get_size;
1707         ops->fill_info          = macvlan_fill_info;
1708
1709         return rtnl_link_register(ops);
1710 };
1711 EXPORT_SYMBOL_GPL(macvlan_link_register);
1712
1713 static struct net *macvlan_get_link_net(const struct net_device *dev)
1714 {
1715         return dev_net(macvlan_dev_real_dev(dev));
1716 }
1717
1718 static struct rtnl_link_ops macvlan_link_ops = {
1719         .kind           = "macvlan",
1720         .setup          = macvlan_setup,
1721         .newlink        = macvlan_newlink,
1722         .dellink        = macvlan_dellink,
1723         .get_link_net   = macvlan_get_link_net,
1724         .priv_size      = sizeof(struct macvlan_dev),
1725 };
1726
1727 static void update_port_bc_queue_len(struct macvlan_port *port)
1728 {
1729         u32 max_bc_queue_len_req = 0;
1730         struct macvlan_dev *vlan;
1731
1732         list_for_each_entry(vlan, &port->vlans, list) {
1733                 if (vlan->bc_queue_len_req > max_bc_queue_len_req)
1734                         max_bc_queue_len_req = vlan->bc_queue_len_req;
1735         }
1736         port->bc_queue_len_used = max_bc_queue_len_req;
1737 }
1738
1739 static int macvlan_device_event(struct notifier_block *unused,
1740                                 unsigned long event, void *ptr)
1741 {
1742         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1743         struct macvlan_dev *vlan, *next;
1744         struct macvlan_port *port;
1745         LIST_HEAD(list_kill);
1746
1747         if (!netif_is_macvlan_port(dev))
1748                 return NOTIFY_DONE;
1749
1750         port = macvlan_port_get_rtnl(dev);
1751
1752         switch (event) {
1753         case NETDEV_UP:
1754         case NETDEV_DOWN:
1755         case NETDEV_CHANGE:
1756                 list_for_each_entry(vlan, &port->vlans, list)
1757                         netif_stacked_transfer_operstate(vlan->lowerdev,
1758                                                          vlan->dev);
1759                 break;
1760         case NETDEV_FEAT_CHANGE:
1761                 list_for_each_entry(vlan, &port->vlans, list) {
1762                         netif_set_gso_max_size(vlan->dev, dev->gso_max_size);
1763                         netif_set_gso_max_segs(vlan->dev, dev->gso_max_segs);
1764                         netdev_update_features(vlan->dev);
1765                 }
1766                 break;
1767         case NETDEV_CHANGEMTU:
1768                 list_for_each_entry(vlan, &port->vlans, list) {
1769                         if (vlan->dev->mtu <= dev->mtu)
1770                                 continue;
1771                         dev_set_mtu(vlan->dev, dev->mtu);
1772                 }
1773                 break;
1774         case NETDEV_CHANGEADDR:
1775                 if (!macvlan_passthru(port))
1776                         return NOTIFY_DONE;
1777
1778                 vlan = list_first_entry_or_null(&port->vlans,
1779                                                 struct macvlan_dev,
1780                                                 list);
1781
1782                 if (vlan && macvlan_sync_address(vlan->dev, dev->dev_addr))
1783                         return NOTIFY_BAD;
1784
1785                 break;
1786         case NETDEV_UNREGISTER:
1787                 /* twiddle thumbs on netns device moves */
1788                 if (dev->reg_state != NETREG_UNREGISTERING)
1789                         break;
1790
1791                 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1792                         vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1793                 unregister_netdevice_many(&list_kill);
1794                 break;
1795         case NETDEV_PRE_TYPE_CHANGE:
1796                 /* Forbid underlying device to change its type. */
1797                 return NOTIFY_BAD;
1798
1799         case NETDEV_NOTIFY_PEERS:
1800         case NETDEV_BONDING_FAILOVER:
1801         case NETDEV_RESEND_IGMP:
1802                 /* Propagate to all vlans */
1803                 list_for_each_entry(vlan, &port->vlans, list)
1804                         call_netdevice_notifiers(event, vlan->dev);
1805         }
1806         return NOTIFY_DONE;
1807 }
1808
1809 static struct notifier_block macvlan_notifier_block __read_mostly = {
1810         .notifier_call  = macvlan_device_event,
1811 };
1812
1813 static int __init macvlan_init_module(void)
1814 {
1815         int err;
1816
1817         register_netdevice_notifier(&macvlan_notifier_block);
1818
1819         err = macvlan_link_register(&macvlan_link_ops);
1820         if (err < 0)
1821                 goto err1;
1822         return 0;
1823 err1:
1824         unregister_netdevice_notifier(&macvlan_notifier_block);
1825         return err;
1826 }
1827
1828 static void __exit macvlan_cleanup_module(void)
1829 {
1830         rtnl_link_unregister(&macvlan_link_ops);
1831         unregister_netdevice_notifier(&macvlan_notifier_block);
1832 }
1833
1834 module_init(macvlan_init_module);
1835 module_exit(macvlan_cleanup_module);
1836
1837 MODULE_LICENSE("GPL");
1838 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1839 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1840 MODULE_ALIAS_RTNL_LINK("macvlan");