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         memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
 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                         kfree_skb(skb);
 465                         return RX_HANDLER_CONSUMED;
 466                 }
 467                 src = macvlan_hash_lookup(port, eth->h_source);
 468                 if (src && src->mode != MACVLAN_MODE_VEPA &&
 469                     src->mode != MACVLAN_MODE_BRIDGE) {
 470                         /* forward to original port. */
 471                         vlan = src;
 472                         ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
 473                               netif_rx(skb);
 474                         handle_res = RX_HANDLER_CONSUMED;
 475                         goto out;
 476                 }
 477
 478                 hash = mc_hash(NULL, eth->h_dest);
 479                 if (test_bit(hash, port->mc_filter))
 480                         macvlan_broadcast_enqueue(port, src, skb);
 481
 482                 return RX_HANDLER_PASS;
 483         }
 484
 485         if (macvlan_forward_source(skb, port, eth->h_source)) {
 486                 kfree_skb(skb);
 487                 return RX_HANDLER_CONSUMED;
 488         }
 489         if (macvlan_passthru(port))
 490                 vlan = list_first_or_null_rcu(&port->vlans,
 491                                               struct macvlan_dev, list);
 492         else
 493                 vlan = macvlan_hash_lookup(port, eth->h_dest);
 494         if (!vlan || vlan->mode == MACVLAN_MODE_SOURCE)
 495                 return RX_HANDLER_PASS;
 496
 497         dev = vlan->dev;
 498         if (unlikely(!(dev->flags & IFF_UP))) {
 499                 kfree_skb(skb);
 500                 return RX_HANDLER_CONSUMED;
 501         }
 502         len = skb->len + ETH_HLEN;
 503         skb = skb_share_check(skb, GFP_ATOMIC);
 504         if (!skb) {
 505                 ret = NET_RX_DROP;
 506                 handle_res = RX_HANDLER_CONSUMED;
 507                 goto out;
 508         }
 509
 510         *pskb = skb;
 511         skb->dev = dev;
 512         skb->pkt_type = PACKET_HOST;
 513
 514         ret = NET_RX_SUCCESS;
 515         handle_res = RX_HANDLER_ANOTHER;
 516 out:
 517         macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
 518         return handle_res;
 519 }
 520
 521 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
 522 {
 523         const struct macvlan_dev *vlan = netdev_priv(dev);
 524         const struct macvlan_port *port = vlan->port;
 525         const struct macvlan_dev *dest;
 526
 527         if (vlan->mode == MACVLAN_MODE_BRIDGE) {
 528                 const struct ethhdr *eth = skb_eth_hdr(skb);
 529
 530                 /* send to other bridge ports directly */
 531                 if (is_multicast_ether_addr(eth->h_dest)) {
 532                         skb_reset_mac_header(skb);
 533                         macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
 534                         goto xmit_world;
 535                 }
 536
 537                 dest = macvlan_hash_lookup(port, eth->h_dest);
 538                 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
 539                         /* send to lowerdev first for its network taps */
 540                         dev_forward_skb(vlan->lowerdev, skb);
 541
 542                         return NET_XMIT_SUCCESS;
 543                 }
 544         }
 545 xmit_world:
 546         skb->dev = vlan->lowerdev;
 547         return dev_queue_xmit_accel(skb,
 548                                     netdev_get_sb_channel(dev) ? dev : NULL);
 549 }
 550
 551 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
 552 {
 553 #ifdef CONFIG_NET_POLL_CONTROLLER
 554         return netpoll_send_skb(vlan->netpoll, skb);
 555 #else
 556         BUG();
 557         return NETDEV_TX_OK;
 558 #endif
 559 }
 560
 561 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
 562                                       struct net_device *dev)
 563 {
 564         struct macvlan_dev *vlan = netdev_priv(dev);
 565         unsigned int len = skb->len;
 566         int ret;
 567
 568         if (unlikely(netpoll_tx_running(dev)))
 569                 return macvlan_netpoll_send_skb(vlan, skb);
 570
 571         ret = macvlan_queue_xmit(skb, dev);
 572
 573         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 574                 struct vlan_pcpu_stats *pcpu_stats;
 575
 576                 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
 577                 u64_stats_update_begin(&pcpu_stats->syncp);
 578                 pcpu_stats->tx_packets++;
 579                 pcpu_stats->tx_bytes += len;
 580                 u64_stats_update_end(&pcpu_stats->syncp);
 581         } else {
 582                 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
 583         }
 584         return ret;
 585 }
 586
 587 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
 588                                unsigned short type, const void *daddr,
 589                                const void *saddr, unsigned len)
 590 {
 591         const struct macvlan_dev *vlan = netdev_priv(dev);
 592         struct net_device *lowerdev = vlan->lowerdev;
 593
 594         return dev_hard_header(skb, lowerdev, type, daddr,
 595                                saddr ? : dev->dev_addr, len);
 596 }
 597
 598 static const struct header_ops macvlan_hard_header_ops = {
 599         .create         = macvlan_hard_header,
 600         .parse          = eth_header_parse,
 601         .cache          = eth_header_cache,
 602         .cache_update   = eth_header_cache_update,
 603 };
 604
 605 static int macvlan_open(struct net_device *dev)
 606 {
 607         struct macvlan_dev *vlan = netdev_priv(dev);
 608         struct net_device *lowerdev = vlan->lowerdev;
 609         int err;
 610
 611         if (macvlan_passthru(vlan->port)) {
 612                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
 613                         err = dev_set_promiscuity(lowerdev, 1);
 614                         if (err < 0)
 615                                 goto out;
 616                 }
 617                 goto hash_add;
 618         }
 619
 620         err = -EADDRINUSE;
 621         if (macvlan_addr_busy(vlan->port, dev->dev_addr))
 622                 goto out;
 623
 624         /* Attempt to populate accel_priv which is used to offload the L2
 625          * forwarding requests for unicast packets.
 626          */
 627         if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD)
 628                 vlan->accel_priv =
 629                       lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
 630
 631         /* If earlier attempt to offload failed, or accel_priv is not
 632          * populated we must add the unicast address to the lower device.
 633          */
 634         if (IS_ERR_OR_NULL(vlan->accel_priv)) {
 635                 vlan->accel_priv = NULL;
 636                 err = dev_uc_add(lowerdev, dev->dev_addr);
 637                 if (err < 0)
 638                         goto out;
 639         }
 640
 641         if (dev->flags & IFF_ALLMULTI) {
 642                 err = dev_set_allmulti(lowerdev, 1);
 643                 if (err < 0)
 644                         goto del_unicast;
 645         }
 646
 647         if (dev->flags & IFF_PROMISC) {
 648                 err = dev_set_promiscuity(lowerdev, 1);
 649                 if (err < 0)
 650                         goto clear_multi;
 651         }
 652
 653 hash_add:
 654         macvlan_hash_add(vlan);
 655         return 0;
 656
 657 clear_multi:
 658         if (dev->flags & IFF_ALLMULTI)
 659                 dev_set_allmulti(lowerdev, -1);
 660 del_unicast:
 661         if (vlan->accel_priv) {
 662                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
 663                                                            vlan->accel_priv);
 664                 vlan->accel_priv = NULL;
 665         } else {
 666                 dev_uc_del(lowerdev, dev->dev_addr);
 667         }
 668 out:
 669         return err;
 670 }
 671
 672 static int macvlan_stop(struct net_device *dev)
 673 {
 674         struct macvlan_dev *vlan = netdev_priv(dev);
 675         struct net_device *lowerdev = vlan->lowerdev;
 676
 677         if (vlan->accel_priv) {
 678                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
 679                                                            vlan->accel_priv);
 680                 vlan->accel_priv = NULL;
 681         }
 682
 683         dev_uc_unsync(lowerdev, dev);
 684         dev_mc_unsync(lowerdev, dev);
 685
 686         if (macvlan_passthru(vlan->port)) {
 687                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
 688                         dev_set_promiscuity(lowerdev, -1);
 689                 goto hash_del;
 690         }
 691
 692         if (dev->flags & IFF_ALLMULTI)
 693                 dev_set_allmulti(lowerdev, -1);
 694
 695         if (dev->flags & IFF_PROMISC)
 696                 dev_set_promiscuity(lowerdev, -1);
 697
 698         dev_uc_del(lowerdev, dev->dev_addr);
 699
 700 hash_del:
 701         macvlan_hash_del(vlan, !dev->dismantle);
 702         return 0;
 703 }
 704
 705 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
 706 {
 707         struct macvlan_dev *vlan = netdev_priv(dev);
 708         struct net_device *lowerdev = vlan->lowerdev;
 709         struct macvlan_port *port = vlan->port;
 710         int err;
 711
 712         if (!(dev->flags & IFF_UP)) {
 713                 /* Just copy in the new address */
 714                 ether_addr_copy(dev->dev_addr, addr);
 715         } else {
 716                 /* Rehash and update the device filters */
 717                 if (macvlan_addr_busy(vlan->port, addr))
 718                         return -EADDRINUSE;
 719
 720                 if (!macvlan_passthru(port)) {
 721                         err = dev_uc_add(lowerdev, addr);
 722                         if (err)
 723                                 return err;
 724
 725                         dev_uc_del(lowerdev, dev->dev_addr);
 726                 }
 727
 728                 macvlan_hash_change_addr(vlan, addr);
 729         }
 730         if (macvlan_passthru(port) && !macvlan_addr_change(port)) {
 731                 /* Since addr_change isn't set, we are here due to lower
 732                  * device change.  Save the lower-dev address so we can
 733                  * restore it later.
 734                  */
 735                 ether_addr_copy(vlan->port->perm_addr,
 736                                 lowerdev->dev_addr);
 737         }
 738         macvlan_clear_addr_change(port);
 739         return 0;
 740 }
 741
 742 static int macvlan_set_mac_address(struct net_device *dev, void *p)
 743 {
 744         struct macvlan_dev *vlan = netdev_priv(dev);
 745         struct sockaddr *addr = p;
 746
 747         if (!is_valid_ether_addr(addr->sa_data))
 748                 return -EADDRNOTAVAIL;
 749
 750         /* If the addresses are the same, this is a no-op */
 751         if (ether_addr_equal(dev->dev_addr, addr->sa_data))
 752                 return 0;
 753
 754         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
 755                 macvlan_set_addr_change(vlan->port);
 756                 return dev_set_mac_address(vlan->lowerdev, addr, NULL);
 757         }
 758
 759         if (macvlan_addr_busy(vlan->port, addr->sa_data))
 760                 return -EADDRINUSE;
 761
 762         return macvlan_sync_address(dev, addr->sa_data);
 763 }
 764
 765 static void macvlan_change_rx_flags(struct net_device *dev, int change)
 766 {
 767         struct macvlan_dev *vlan = netdev_priv(dev);
 768         struct net_device *lowerdev = vlan->lowerdev;
 769
 770         if (dev->flags & IFF_UP) {
 771                 if (change & IFF_ALLMULTI)
 772                         dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 773                 if (change & IFF_PROMISC)
 774                         dev_set_promiscuity(lowerdev,
 775                                             dev->flags & IFF_PROMISC ? 1 : -1);
 776
 777         }
 778 }
 779
 780 static void macvlan_compute_filter(unsigned long *mc_filter,
 781                                    struct net_device *dev,
 782                                    struct macvlan_dev *vlan)
 783 {
 784         if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
 785                 bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ);
 786         } else {
 787                 struct netdev_hw_addr *ha;
 788                 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
 789
 790                 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
 791                 netdev_for_each_mc_addr(ha, dev) {
 792                         __set_bit(mc_hash(vlan, ha->addr), filter);
 793                 }
 794
 795                 __set_bit(mc_hash(vlan, dev->broadcast), filter);
 796
 797                 bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ);
 798         }
 799 }
 800
 801 static void macvlan_set_mac_lists(struct net_device *dev)
 802 {
 803         struct macvlan_dev *vlan = netdev_priv(dev);
 804
 805         macvlan_compute_filter(vlan->mc_filter, dev, vlan);
 806
 807         dev_uc_sync(vlan->lowerdev, dev);
 808         dev_mc_sync(vlan->lowerdev, dev);
 809
 810         /* This is slightly inaccurate as we're including the subscription
 811          * list of vlan->lowerdev too.
 812          *
 813          * Bug alert: This only works if everyone has the same broadcast
 814          * address as lowerdev.  As soon as someone changes theirs this
 815          * will break.
 816          *
 817          * However, this is already broken as when you change your broadcast
 818          * address we don't get called.
 819          *
 820          * The solution is to maintain a list of broadcast addresses like
 821          * we do for uc/mc, if you care.
 822          */
 823         macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL);
 824 }
 825
 826 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
 827 {
 828         struct macvlan_dev *vlan = netdev_priv(dev);
 829
 830         if (vlan->lowerdev->mtu < new_mtu)
 831                 return -EINVAL;
 832         dev->mtu = new_mtu;
 833         return 0;
 834 }
 835
 836 static int macvlan_eth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 837 {
 838         struct net_device *real_dev = macvlan_dev_real_dev(dev);
 839         const struct net_device_ops *ops = real_dev->netdev_ops;
 840         struct ifreq ifrr;
 841         int err = -EOPNOTSUPP;
 842
 843         strscpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
 844         ifrr.ifr_ifru = ifr->ifr_ifru;
 845
 846         switch (cmd) {
 847         case SIOCSHWTSTAMP:
 848                 if (!net_eq(dev_net(dev), &init_net))
 849                         break;
 850                 fallthrough;
 851         case SIOCGHWTSTAMP:
 852                 if (netif_device_present(real_dev) && ops->ndo_eth_ioctl)
 853                         err = ops->ndo_eth_ioctl(real_dev, &ifrr, cmd);
 854                 break;
 855         }
 856
 857         if (!err)
 858                 ifr->ifr_ifru = ifrr.ifr_ifru;
 859
 860         return err;
 861 }
 862
 863 /*
 864  * macvlan network devices have devices nesting below it and are a special
 865  * "super class" of normal network devices; split their locks off into a
 866  * separate class since they always nest.
 867  */
 868 static struct lock_class_key macvlan_netdev_addr_lock_key;
 869
 870 #define ALWAYS_ON_OFFLOADS \
 871         (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | \
 872          NETIF_F_GSO_ROBUST | NETIF_F_GSO_ENCAP_ALL)
 873
 874 #define ALWAYS_ON_FEATURES (ALWAYS_ON_OFFLOADS | NETIF_F_LLTX)
 875
 876 #define MACVLAN_FEATURES \
 877         (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
 878          NETIF_F_GSO | NETIF_F_TSO | NETIF_F_LRO | \
 879          NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
 880          NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
 881
 882 #define MACVLAN_STATE_MASK \
 883         ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
 884
 885 static void macvlan_set_lockdep_class(struct net_device *dev)
 886 {
 887         netdev_lockdep_set_classes(dev);
 888         lockdep_set_class(&dev->addr_list_lock,
 889                           &macvlan_netdev_addr_lock_key);
 890 }
 891
 892 static int macvlan_init(struct net_device *dev)
 893 {
 894         struct macvlan_dev *vlan = netdev_priv(dev);
 895         const struct net_device *lowerdev = vlan->lowerdev;
 896         struct macvlan_port *port = vlan->port;
 897
 898         dev->state              = (dev->state & ~MACVLAN_STATE_MASK) |
 899                                   (lowerdev->state & MACVLAN_STATE_MASK);
 900         dev->features           = lowerdev->features & MACVLAN_FEATURES;
 901         dev->features           |= ALWAYS_ON_FEATURES;
 902         dev->hw_features        |= NETIF_F_LRO;
 903         dev->vlan_features      = lowerdev->vlan_features & MACVLAN_FEATURES;
 904         dev->vlan_features      |= ALWAYS_ON_OFFLOADS;
 905         dev->hw_enc_features    |= dev->features;
 906         dev->gso_max_size       = lowerdev->gso_max_size;
 907         dev->gso_max_segs       = lowerdev->gso_max_segs;
 908         dev->hard_header_len    = lowerdev->hard_header_len;
 909         macvlan_set_lockdep_class(dev);
 910
 911         vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
 912         if (!vlan->pcpu_stats)
 913                 return -ENOMEM;
 914
 915         port->count += 1;
 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         .ndo_change_proto_down  = dev_change_proto_down_generic,
1178 };
1179
1180 void macvlan_common_setup(struct net_device *dev)
1181 {
1182         ether_setup(dev);
1183
1184         dev->min_mtu            = 0;
1185         dev->max_mtu            = ETH_MAX_MTU;
1186         dev->priv_flags        &= ~IFF_TX_SKB_SHARING;
1187         netif_keep_dst(dev);
1188         dev->priv_flags        |= IFF_UNICAST_FLT;
1189         dev->netdev_ops         = &macvlan_netdev_ops;
1190         dev->needs_free_netdev  = true;
1191         dev->header_ops         = &macvlan_hard_header_ops;
1192         dev->ethtool_ops        = &macvlan_ethtool_ops;
1193 }
1194 EXPORT_SYMBOL_GPL(macvlan_common_setup);
1195
1196 static void macvlan_setup(struct net_device *dev)
1197 {
1198         macvlan_common_setup(dev);
1199         dev->priv_flags |= IFF_NO_QUEUE;
1200 }
1201
1202 static int macvlan_port_create(struct net_device *dev)
1203 {
1204         struct macvlan_port *port;
1205         unsigned int i;
1206         int err;
1207
1208         if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1209                 return -EINVAL;
1210
1211         if (netdev_is_rx_handler_busy(dev))
1212                 return -EBUSY;
1213
1214         port = kzalloc(sizeof(*port), GFP_KERNEL);
1215         if (port == NULL)
1216                 return -ENOMEM;
1217
1218         port->dev = dev;
1219         ether_addr_copy(port->perm_addr, dev->dev_addr);
1220         INIT_LIST_HEAD(&port->vlans);
1221         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1222                 INIT_HLIST_HEAD(&port->vlan_hash[i]);
1223         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1224                 INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1225
1226         port->bc_queue_len_used = 0;
1227         skb_queue_head_init(&port->bc_queue);
1228         INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1229
1230         err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1231         if (err)
1232                 kfree(port);
1233         else
1234                 dev->priv_flags |= IFF_MACVLAN_PORT;
1235         return err;
1236 }
1237
1238 static void macvlan_port_destroy(struct net_device *dev)
1239 {
1240         struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1241         struct sk_buff *skb;
1242
1243         dev->priv_flags &= ~IFF_MACVLAN_PORT;
1244         netdev_rx_handler_unregister(dev);
1245
1246         /* After this point, no packet can schedule bc_work anymore,
1247          * but we need to cancel it and purge left skbs if any.
1248          */
1249         cancel_work_sync(&port->bc_work);
1250
1251         while ((skb = __skb_dequeue(&port->bc_queue))) {
1252                 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
1253
1254                 if (src)
1255                         dev_put(src->dev);
1256
1257                 kfree_skb(skb);
1258         }
1259
1260         /* If the lower device address has been changed by passthru
1261          * macvlan, put it back.
1262          */
1263         if (macvlan_passthru(port) &&
1264             !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) {
1265                 struct sockaddr sa;
1266
1267                 sa.sa_family = port->dev->type;
1268                 memcpy(&sa.sa_data, port->perm_addr, port->dev->addr_len);
1269                 dev_set_mac_address(port->dev, &sa, NULL);
1270         }
1271
1272         kfree(port);
1273 }
1274
1275 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[],
1276                             struct netlink_ext_ack *extack)
1277 {
1278         struct nlattr *nla, *head;
1279         int rem, len;
1280
1281         if (tb[IFLA_ADDRESS]) {
1282                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1283                         return -EINVAL;
1284                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1285                         return -EADDRNOTAVAIL;
1286         }
1287
1288         if (!data)
1289                 return 0;
1290
1291         if (data[IFLA_MACVLAN_FLAGS] &&
1292             nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~(MACVLAN_FLAG_NOPROMISC |
1293                                                       MACVLAN_FLAG_NODST))
1294                 return -EINVAL;
1295
1296         if (data[IFLA_MACVLAN_MODE]) {
1297                 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1298                 case MACVLAN_MODE_PRIVATE:
1299                 case MACVLAN_MODE_VEPA:
1300                 case MACVLAN_MODE_BRIDGE:
1301                 case MACVLAN_MODE_PASSTHRU:
1302                 case MACVLAN_MODE_SOURCE:
1303                         break;
1304                 default:
1305                         return -EINVAL;
1306                 }
1307         }
1308
1309         if (data[IFLA_MACVLAN_MACADDR_MODE]) {
1310                 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1311                 case MACVLAN_MACADDR_ADD:
1312                 case MACVLAN_MACADDR_DEL:
1313                 case MACVLAN_MACADDR_FLUSH:
1314                 case MACVLAN_MACADDR_SET:
1315                         break;
1316                 default:
1317                         return -EINVAL;
1318                 }
1319         }
1320
1321         if (data[IFLA_MACVLAN_MACADDR]) {
1322                 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1323                         return -EINVAL;
1324
1325                 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1326                         return -EADDRNOTAVAIL;
1327         }
1328
1329         if (data[IFLA_MACVLAN_MACADDR_DATA]) {
1330                 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1331                 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1332
1333                 nla_for_each_attr(nla, head, len, rem) {
1334                         if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1335                             nla_len(nla) != ETH_ALEN)
1336                                 return -EINVAL;
1337
1338                         if (!is_valid_ether_addr(nla_data(nla)))
1339                                 return -EADDRNOTAVAIL;
1340                 }
1341         }
1342
1343         if (data[IFLA_MACVLAN_MACADDR_COUNT])
1344                 return -EINVAL;
1345
1346         return 0;
1347 }
1348
1349 /*
1350  * reconfigure list of remote source mac address
1351  * (only for macvlan devices in source mode)
1352  * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1353  * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1354  */
1355 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1356                                       struct nlattr *data[])
1357 {
1358         char *addr = NULL;
1359         int ret, rem, len;
1360         struct nlattr *nla, *head;
1361         struct macvlan_source_entry *entry;
1362
1363         if (data[IFLA_MACVLAN_MACADDR])
1364                 addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1365
1366         if (mode == MACVLAN_MACADDR_ADD) {
1367                 if (!addr)
1368                         return -EINVAL;
1369
1370                 return macvlan_hash_add_source(vlan, addr);
1371
1372         } else if (mode == MACVLAN_MACADDR_DEL) {
1373                 if (!addr)
1374                         return -EINVAL;
1375
1376                 entry = macvlan_hash_lookup_source(vlan, addr);
1377                 if (entry) {
1378                         macvlan_hash_del_source(entry);
1379                         vlan->macaddr_count--;
1380                 }
1381         } else if (mode == MACVLAN_MACADDR_FLUSH) {
1382                 macvlan_flush_sources(vlan->port, vlan);
1383         } else if (mode == MACVLAN_MACADDR_SET) {
1384                 macvlan_flush_sources(vlan->port, vlan);
1385
1386                 if (addr) {
1387                         ret = macvlan_hash_add_source(vlan, addr);
1388                         if (ret)
1389                                 return ret;
1390                 }
1391
1392                 if (!data[IFLA_MACVLAN_MACADDR_DATA])
1393                         return 0;
1394
1395                 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1396                 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1397
1398                 nla_for_each_attr(nla, head, len, rem) {
1399                         addr = nla_data(nla);
1400                         ret = macvlan_hash_add_source(vlan, addr);
1401                         if (ret)
1402                                 return ret;
1403                 }
1404         } else {
1405                 return -EINVAL;
1406         }
1407
1408         return 0;
1409 }
1410
1411 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1412                            struct nlattr *tb[], struct nlattr *data[],
1413                            struct netlink_ext_ack *extack)
1414 {
1415         struct macvlan_dev *vlan = netdev_priv(dev);
1416         struct macvlan_port *port;
1417         struct net_device *lowerdev;
1418         int err;
1419         int macmode;
1420         bool create = false;
1421
1422         if (!tb[IFLA_LINK])
1423                 return -EINVAL;
1424
1425         lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1426         if (lowerdev == NULL)
1427                 return -ENODEV;
1428
1429         /* When creating macvlans or macvtaps on top of other macvlans - use
1430          * the real device as the lowerdev.
1431          */
1432         if (netif_is_macvlan(lowerdev))
1433                 lowerdev = macvlan_dev_real_dev(lowerdev);
1434
1435         if (!tb[IFLA_MTU])
1436                 dev->mtu = lowerdev->mtu;
1437         else if (dev->mtu > lowerdev->mtu)
1438                 return -EINVAL;
1439
1440         /* MTU range: 68 - lowerdev->max_mtu */
1441         dev->min_mtu = ETH_MIN_MTU;
1442         dev->max_mtu = lowerdev->max_mtu;
1443
1444         if (!tb[IFLA_ADDRESS])
1445                 eth_hw_addr_random(dev);
1446
1447         if (!netif_is_macvlan_port(lowerdev)) {
1448                 err = macvlan_port_create(lowerdev);
1449                 if (err < 0)
1450                         return err;
1451                 create = true;
1452         }
1453         port = macvlan_port_get_rtnl(lowerdev);
1454
1455         /* Only 1 macvlan device can be created in passthru mode */
1456         if (macvlan_passthru(port)) {
1457                 /* The macvlan port must be not created this time,
1458                  * still goto destroy_macvlan_port for readability.
1459                  */
1460                 err = -EINVAL;
1461                 goto destroy_macvlan_port;
1462         }
1463
1464         vlan->lowerdev = lowerdev;
1465         vlan->dev      = dev;
1466         vlan->port     = port;
1467         vlan->set_features = MACVLAN_FEATURES;
1468
1469         vlan->mode     = MACVLAN_MODE_VEPA;
1470         if (data && data[IFLA_MACVLAN_MODE])
1471                 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1472
1473         if (data && data[IFLA_MACVLAN_FLAGS])
1474                 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1475
1476         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1477                 if (port->count) {
1478                         err = -EINVAL;
1479                         goto destroy_macvlan_port;
1480                 }
1481                 macvlan_set_passthru(port);
1482                 eth_hw_addr_inherit(dev, lowerdev);
1483         }
1484
1485         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1486                 if (vlan->mode != MACVLAN_MODE_SOURCE) {
1487                         err = -EINVAL;
1488                         goto destroy_macvlan_port;
1489                 }
1490                 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1491                 err = macvlan_changelink_sources(vlan, macmode, data);
1492                 if (err)
1493                         goto destroy_macvlan_port;
1494         }
1495
1496         vlan->bc_queue_len_req = MACVLAN_DEFAULT_BC_QUEUE_LEN;
1497         if (data && data[IFLA_MACVLAN_BC_QUEUE_LEN])
1498                 vlan->bc_queue_len_req = nla_get_u32(data[IFLA_MACVLAN_BC_QUEUE_LEN]);
1499
1500         err = register_netdevice(dev);
1501         if (err < 0)
1502                 goto destroy_macvlan_port;
1503
1504         dev->priv_flags |= IFF_MACVLAN;
1505         err = netdev_upper_dev_link(lowerdev, dev, extack);
1506         if (err)
1507                 goto unregister_netdev;
1508
1509         list_add_tail_rcu(&vlan->list, &port->vlans);
1510         update_port_bc_queue_len(vlan->port);
1511         netif_stacked_transfer_operstate(lowerdev, dev);
1512         linkwatch_fire_event(dev);
1513
1514         return 0;
1515
1516 unregister_netdev:
1517         /* macvlan_uninit would free the macvlan port */
1518         unregister_netdevice(dev);
1519         return err;
1520 destroy_macvlan_port:
1521         /* the macvlan port may be freed by macvlan_uninit when fail to register.
1522          * so we destroy the macvlan port only when it's valid.
1523          */
1524         if (create && macvlan_port_get_rtnl(lowerdev))
1525                 macvlan_port_destroy(port->dev);
1526         return err;
1527 }
1528 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1529
1530 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1531                            struct nlattr *tb[], struct nlattr *data[],
1532                            struct netlink_ext_ack *extack)
1533 {
1534         return macvlan_common_newlink(src_net, dev, tb, data, extack);
1535 }
1536
1537 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1538 {
1539         struct macvlan_dev *vlan = netdev_priv(dev);
1540
1541         if (vlan->mode == MACVLAN_MODE_SOURCE)
1542                 macvlan_flush_sources(vlan->port, vlan);
1543         list_del_rcu(&vlan->list);
1544         update_port_bc_queue_len(vlan->port);
1545         unregister_netdevice_queue(dev, head);
1546         netdev_upper_dev_unlink(vlan->lowerdev, dev);
1547 }
1548 EXPORT_SYMBOL_GPL(macvlan_dellink);
1549
1550 static int macvlan_changelink(struct net_device *dev,
1551                               struct nlattr *tb[], struct nlattr *data[],
1552                               struct netlink_ext_ack *extack)
1553 {
1554         struct macvlan_dev *vlan = netdev_priv(dev);
1555         enum macvlan_mode mode;
1556         bool set_mode = false;
1557         enum macvlan_macaddr_mode macmode;
1558         int ret;
1559
1560         /* Validate mode, but don't set yet: setting flags may fail. */
1561         if (data && data[IFLA_MACVLAN_MODE]) {
1562                 set_mode = true;
1563                 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1564                 /* Passthrough mode can't be set or cleared dynamically */
1565                 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1566                     (vlan->mode == MACVLAN_MODE_PASSTHRU))
1567                         return -EINVAL;
1568                 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1569                     vlan->mode != mode)
1570                         macvlan_flush_sources(vlan->port, vlan);
1571         }
1572
1573         if (data && data[IFLA_MACVLAN_FLAGS]) {
1574                 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1575                 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1576                 if (macvlan_passthru(vlan->port) && promisc) {
1577                         int err;
1578
1579                         if (flags & MACVLAN_FLAG_NOPROMISC)
1580                                 err = dev_set_promiscuity(vlan->lowerdev, -1);
1581                         else
1582                                 err = dev_set_promiscuity(vlan->lowerdev, 1);
1583                         if (err < 0)
1584                                 return err;
1585                 }
1586                 vlan->flags = flags;
1587         }
1588
1589         if (data && data[IFLA_MACVLAN_BC_QUEUE_LEN]) {
1590                 vlan->bc_queue_len_req = nla_get_u32(data[IFLA_MACVLAN_BC_QUEUE_LEN]);
1591                 update_port_bc_queue_len(vlan->port);
1592         }
1593
1594         if (set_mode)
1595                 vlan->mode = mode;
1596         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1597                 if (vlan->mode != MACVLAN_MODE_SOURCE)
1598                         return -EINVAL;
1599                 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1600                 ret = macvlan_changelink_sources(vlan, macmode, data);
1601                 if (ret)
1602                         return ret;
1603         }
1604         return 0;
1605 }
1606
1607 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1608 {
1609         if (vlan->macaddr_count == 0)
1610                 return 0;
1611         return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1612                 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1613 }
1614
1615 static size_t macvlan_get_size(const struct net_device *dev)
1616 {
1617         struct macvlan_dev *vlan = netdev_priv(dev);
1618
1619         return (0
1620                 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1621                 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1622                 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1623                 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1624                 + nla_total_size(4) /* IFLA_MACVLAN_BC_QUEUE_LEN */
1625                 + nla_total_size(4) /* IFLA_MACVLAN_BC_QUEUE_LEN_USED */
1626                 );
1627 }
1628
1629 static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1630                                      const struct macvlan_dev *vlan,
1631                                      const int i)
1632 {
1633         struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1634         struct macvlan_source_entry *entry;
1635
1636         hlist_for_each_entry_rcu(entry, h, hlist) {
1637                 if (entry->vlan != vlan)
1638                         continue;
1639                 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1640                         return 1;
1641         }
1642         return 0;
1643 }
1644
1645 static int macvlan_fill_info(struct sk_buff *skb,
1646                                 const struct net_device *dev)
1647 {
1648         struct macvlan_dev *vlan = netdev_priv(dev);
1649         struct macvlan_port *port = vlan->port;
1650         int i;
1651         struct nlattr *nest;
1652
1653         if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1654                 goto nla_put_failure;
1655         if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1656                 goto nla_put_failure;
1657         if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1658                 goto nla_put_failure;
1659         if (vlan->macaddr_count > 0) {
1660                 nest = nla_nest_start_noflag(skb, IFLA_MACVLAN_MACADDR_DATA);
1661                 if (nest == NULL)
1662                         goto nla_put_failure;
1663
1664                 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1665                         if (macvlan_fill_info_macaddr(skb, vlan, i))
1666                                 goto nla_put_failure;
1667                 }
1668                 nla_nest_end(skb, nest);
1669         }
1670         if (nla_put_u32(skb, IFLA_MACVLAN_BC_QUEUE_LEN, vlan->bc_queue_len_req))
1671                 goto nla_put_failure;
1672         if (nla_put_u32(skb, IFLA_MACVLAN_BC_QUEUE_LEN_USED, port->bc_queue_len_used))
1673                 goto nla_put_failure;
1674         return 0;
1675
1676 nla_put_failure:
1677         return -EMSGSIZE;
1678 }
1679
1680 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1681         [IFLA_MACVLAN_MODE]  = { .type = NLA_U32 },
1682         [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1683         [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1684         [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1685         [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1686         [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1687         [IFLA_MACVLAN_BC_QUEUE_LEN] = { .type = NLA_U32 },
1688         [IFLA_MACVLAN_BC_QUEUE_LEN_USED] = { .type = NLA_REJECT },
1689 };
1690
1691 int macvlan_link_register(struct rtnl_link_ops *ops)
1692 {
1693         /* common fields */
1694         ops->validate           = macvlan_validate;
1695         ops->maxtype            = IFLA_MACVLAN_MAX;
1696         ops->policy             = macvlan_policy;
1697         ops->changelink         = macvlan_changelink;
1698         ops->get_size           = macvlan_get_size;
1699         ops->fill_info          = macvlan_fill_info;
1700
1701         return rtnl_link_register(ops);
1702 };
1703 EXPORT_SYMBOL_GPL(macvlan_link_register);
1704
1705 static struct net *macvlan_get_link_net(const struct net_device *dev)
1706 {
1707         return dev_net(macvlan_dev_real_dev(dev));
1708 }
1709
1710 static struct rtnl_link_ops macvlan_link_ops = {
1711         .kind           = "macvlan",
1712         .setup          = macvlan_setup,
1713         .newlink        = macvlan_newlink,
1714         .dellink        = macvlan_dellink,
1715         .get_link_net   = macvlan_get_link_net,
1716         .priv_size      = sizeof(struct macvlan_dev),
1717 };
1718
1719 static void update_port_bc_queue_len(struct macvlan_port *port)
1720 {
1721         u32 max_bc_queue_len_req = 0;
1722         struct macvlan_dev *vlan;
1723
1724         list_for_each_entry(vlan, &port->vlans, list) {
1725                 if (vlan->bc_queue_len_req > max_bc_queue_len_req)
1726                         max_bc_queue_len_req = vlan->bc_queue_len_req;
1727         }
1728         port->bc_queue_len_used = max_bc_queue_len_req;
1729 }
1730
1731 static int macvlan_device_event(struct notifier_block *unused,
1732                                 unsigned long event, void *ptr)
1733 {
1734         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1735         struct macvlan_dev *vlan, *next;
1736         struct macvlan_port *port;
1737         LIST_HEAD(list_kill);
1738
1739         if (!netif_is_macvlan_port(dev))
1740                 return NOTIFY_DONE;
1741
1742         port = macvlan_port_get_rtnl(dev);
1743
1744         switch (event) {
1745         case NETDEV_UP:
1746         case NETDEV_DOWN:
1747         case NETDEV_CHANGE:
1748                 list_for_each_entry(vlan, &port->vlans, list)
1749                         netif_stacked_transfer_operstate(vlan->lowerdev,
1750                                                          vlan->dev);
1751                 break;
1752         case NETDEV_FEAT_CHANGE:
1753                 list_for_each_entry(vlan, &port->vlans, list) {
1754                         vlan->dev->gso_max_size = dev->gso_max_size;
1755                         vlan->dev->gso_max_segs = dev->gso_max_segs;
1756                         netdev_update_features(vlan->dev);
1757                 }
1758                 break;
1759         case NETDEV_CHANGEMTU:
1760                 list_for_each_entry(vlan, &port->vlans, list) {
1761                         if (vlan->dev->mtu <= dev->mtu)
1762                                 continue;
1763                         dev_set_mtu(vlan->dev, dev->mtu);
1764                 }
1765                 break;
1766         case NETDEV_CHANGEADDR:
1767                 if (!macvlan_passthru(port))
1768                         return NOTIFY_DONE;
1769
1770                 vlan = list_first_entry_or_null(&port->vlans,
1771                                                 struct macvlan_dev,
1772                                                 list);
1773
1774                 if (vlan && macvlan_sync_address(vlan->dev, dev->dev_addr))
1775                         return NOTIFY_BAD;
1776
1777                 break;
1778         case NETDEV_UNREGISTER:
1779                 /* twiddle thumbs on netns device moves */
1780                 if (dev->reg_state != NETREG_UNREGISTERING)
1781                         break;
1782
1783                 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1784                         vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1785                 unregister_netdevice_many(&list_kill);
1786                 break;
1787         case NETDEV_PRE_TYPE_CHANGE:
1788                 /* Forbid underlying device to change its type. */
1789                 return NOTIFY_BAD;
1790
1791         case NETDEV_NOTIFY_PEERS:
1792         case NETDEV_BONDING_FAILOVER:
1793         case NETDEV_RESEND_IGMP:
1794                 /* Propagate to all vlans */
1795                 list_for_each_entry(vlan, &port->vlans, list)
1796                         call_netdevice_notifiers(event, vlan->dev);
1797         }
1798         return NOTIFY_DONE;
1799 }
1800
1801 static struct notifier_block macvlan_notifier_block __read_mostly = {
1802         .notifier_call  = macvlan_device_event,
1803 };
1804
1805 static int __init macvlan_init_module(void)
1806 {
1807         int err;
1808
1809         register_netdevice_notifier(&macvlan_notifier_block);
1810
1811         err = macvlan_link_register(&macvlan_link_ops);
1812         if (err < 0)
1813                 goto err1;
1814         return 0;
1815 err1:
1816         unregister_netdevice_notifier(&macvlan_notifier_block);
1817         return err;
1818 }
1819
1820 static void __exit macvlan_cleanup_module(void)
1821 {
1822         rtnl_link_unregister(&macvlan_link_ops);
1823         unregister_netdevice_notifier(&macvlan_notifier_block);
1824 }
1825
1826 module_init(macvlan_init_module);
1827 module_exit(macvlan_cleanup_module);
1828
1829 MODULE_LICENSE("GPL");
1830 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1831 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1832 MODULE_ALIAS_RTNL_LINK("macvlan");