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         for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
 276                 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) {
 277                         if (vlan->dev == src || !(vlan->mode & mode))
 278                                 continue;
 279
 280                         hash = mc_hash(vlan, eth->h_dest);
 281                         if (!test_bit(hash, vlan->mc_filter))
 282                                 continue;
 283
 284                         err = NET_RX_DROP;
 285                         nskb = skb_clone(skb, GFP_ATOMIC);
 286                         if (likely(nskb))
 287                                 err = macvlan_broadcast_one(
 288                                         nskb, vlan, eth,
 289                                         mode == MACVLAN_MODE_BRIDGE) ?:
 290                                       netif_rx_ni(nskb);
 291                         macvlan_count_rx(vlan, skb->len + ETH_HLEN,
 292                                          err == NET_RX_SUCCESS, true);
 293                 }
 294         }
 295 }
 296
 297 static void macvlan_process_broadcast(struct work_struct *w)
 298 {
 299         struct macvlan_port *port = container_of(w, struct macvlan_port,
 300                                                  bc_work);
 301         struct sk_buff *skb;
 302         struct sk_buff_head list;
 303
 304         __skb_queue_head_init(&list);
 305
 306         spin_lock_bh(&port->bc_queue.lock);
 307         skb_queue_splice_tail_init(&port->bc_queue, &list);
 308         spin_unlock_bh(&port->bc_queue.lock);
 309
 310         while ((skb = __skb_dequeue(&list))) {
 311                 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
 312
 313                 rcu_read_lock();
 314
 315                 if (!src)
 316                         /* frame comes from an external address */
 317                         macvlan_broadcast(skb, port, NULL,
 318                                           MACVLAN_MODE_PRIVATE |
 319                                           MACVLAN_MODE_VEPA    |
 320                                           MACVLAN_MODE_PASSTHRU|
 321                                           MACVLAN_MODE_BRIDGE);
 322                 else if (src->mode == MACVLAN_MODE_VEPA)
 323                         /* flood to everyone except source */
 324                         macvlan_broadcast(skb, port, src->dev,
 325                                           MACVLAN_MODE_VEPA |
 326                                           MACVLAN_MODE_BRIDGE);
 327                 else
 328                         /*
 329                          * flood only to VEPA ports, bridge ports
 330                          * already saw the frame on the way out.
 331                          */
 332                         macvlan_broadcast(skb, port, src->dev,
 333                                           MACVLAN_MODE_VEPA);
 334
 335                 rcu_read_unlock();
 336
 337                 if (src)
 338                         dev_put(src->dev);
 339                 consume_skb(skb);
 340
 341                 cond_resched();
 342         }
 343 }
 344
 345 static void macvlan_broadcast_enqueue(struct macvlan_port *port,
 346                                       const struct macvlan_dev *src,
 347                                       struct sk_buff *skb)
 348 {
 349         struct sk_buff *nskb;
 350         int err = -ENOMEM;
 351
 352         nskb = skb_clone(skb, GFP_ATOMIC);
 353         if (!nskb)
 354                 goto err;
 355
 356         MACVLAN_SKB_CB(nskb)->src = src;
 357
 358         spin_lock(&port->bc_queue.lock);
 359         if (skb_queue_len(&port->bc_queue) < port->bc_queue_len_used) {
 360                 if (src)
 361                         dev_hold(src->dev);
 362                 __skb_queue_tail(&port->bc_queue, nskb);
 363                 err = 0;
 364         }
 365         spin_unlock(&port->bc_queue.lock);
 366
 367         schedule_work(&port->bc_work);
 368
 369         if (err)
 370                 goto free_nskb;
 371
 372         return;
 373
 374 free_nskb:
 375         kfree_skb(nskb);
 376 err:
 377         atomic_long_inc(&skb->dev->rx_dropped);
 378 }
 379
 380 static void macvlan_flush_sources(struct macvlan_port *port,
 381                                   struct macvlan_dev *vlan)
 382 {
 383         int i;
 384
 385         for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
 386                 struct hlist_node *h, *n;
 387
 388                 hlist_for_each_safe(h, n, &port->vlan_source_hash[i]) {
 389                         struct macvlan_source_entry *entry;
 390
 391                         entry = hlist_entry(h, struct macvlan_source_entry,
 392                                             hlist);
 393                         if (entry->vlan == vlan)
 394                                 macvlan_hash_del_source(entry);
 395                 }
 396         }
 397         vlan->macaddr_count = 0;
 398 }
 399
 400 static void macvlan_forward_source_one(struct sk_buff *skb,
 401                                        struct macvlan_dev *vlan)
 402 {
 403         struct sk_buff *nskb;
 404         struct net_device *dev;
 405         int len;
 406         int ret;
 407
 408         dev = vlan->dev;
 409         if (unlikely(!(dev->flags & IFF_UP)))
 410                 return;
 411
 412         nskb = skb_clone(skb, GFP_ATOMIC);
 413         if (!nskb)
 414                 return;
 415
 416         len = nskb->len + ETH_HLEN;
 417         nskb->dev = dev;
 418
 419         if (ether_addr_equal_64bits(eth_hdr(skb)->h_dest, dev->dev_addr))
 420                 nskb->pkt_type = PACKET_HOST;
 421
 422         ret = netif_rx(nskb);
 423         macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
 424 }
 425
 426 static void macvlan_forward_source(struct sk_buff *skb,
 427                                    struct macvlan_port *port,
 428                                    const unsigned char *addr)
 429 {
 430         struct macvlan_source_entry *entry;
 431         u32 idx = macvlan_eth_hash(addr);
 432         struct hlist_head *h = &port->vlan_source_hash[idx];
 433
 434         hlist_for_each_entry_rcu(entry, h, hlist) {
 435                 if (ether_addr_equal_64bits(entry->addr, addr))
 436                         macvlan_forward_source_one(skb, entry->vlan);
 437         }
 438 }
 439
 440 /* called under rcu_read_lock() from netif_receive_skb */
 441 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
 442 {
 443         struct macvlan_port *port;
 444         struct sk_buff *skb = *pskb;
 445         const struct ethhdr *eth = eth_hdr(skb);
 446         const struct macvlan_dev *vlan;
 447         const struct macvlan_dev *src;
 448         struct net_device *dev;
 449         unsigned int len = 0;
 450         int ret;
 451         rx_handler_result_t handle_res;
 452
 453         /* Packets from dev_loopback_xmit() do not have L2 header, bail out */
 454         if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
 455                 return RX_HANDLER_PASS;
 456
 457         port = macvlan_port_get_rcu(skb->dev);
 458         if (is_multicast_ether_addr(eth->h_dest)) {
 459                 unsigned int hash;
 460
 461                 skb = ip_check_defrag(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN);
 462                 if (!skb)
 463                         return RX_HANDLER_CONSUMED;
 464                 *pskb = skb;
 465                 eth = eth_hdr(skb);
 466                 macvlan_forward_source(skb, port, eth->h_source);
 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         macvlan_forward_source(skb, port, eth->h_source);
 486         if (macvlan_passthru(port))
 487                 vlan = list_first_or_null_rcu(&port->vlans,
 488                                               struct macvlan_dev, list);
 489         else
 490                 vlan = macvlan_hash_lookup(port, eth->h_dest);
 491         if (!vlan || vlan->mode == MACVLAN_MODE_SOURCE)
 492                 return RX_HANDLER_PASS;
 493
 494         dev = vlan->dev;
 495         if (unlikely(!(dev->flags & IFF_UP))) {
 496                 kfree_skb(skb);
 497                 return RX_HANDLER_CONSUMED;
 498         }
 499         len = skb->len + ETH_HLEN;
 500         skb = skb_share_check(skb, GFP_ATOMIC);
 501         if (!skb) {
 502                 ret = NET_RX_DROP;
 503                 handle_res = RX_HANDLER_CONSUMED;
 504                 goto out;
 505         }
 506
 507         *pskb = skb;
 508         skb->dev = dev;
 509         skb->pkt_type = PACKET_HOST;
 510
 511         ret = NET_RX_SUCCESS;
 512         handle_res = RX_HANDLER_ANOTHER;
 513 out:
 514         macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
 515         return handle_res;
 516 }
 517
 518 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
 519 {
 520         const struct macvlan_dev *vlan = netdev_priv(dev);
 521         const struct macvlan_port *port = vlan->port;
 522         const struct macvlan_dev *dest;
 523
 524         if (vlan->mode == MACVLAN_MODE_BRIDGE) {
 525                 const struct ethhdr *eth = skb_eth_hdr(skb);
 526
 527                 /* send to other bridge ports directly */
 528                 if (is_multicast_ether_addr(eth->h_dest)) {
 529                         skb_reset_mac_header(skb);
 530                         macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
 531                         goto xmit_world;
 532                 }
 533
 534                 dest = macvlan_hash_lookup(port, eth->h_dest);
 535                 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
 536                         /* send to lowerdev first for its network taps */
 537                         dev_forward_skb(vlan->lowerdev, skb);
 538
 539                         return NET_XMIT_SUCCESS;
 540                 }
 541         }
 542 xmit_world:
 543         skb->dev = vlan->lowerdev;
 544         return dev_queue_xmit_accel(skb,
 545                                     netdev_get_sb_channel(dev) ? dev : NULL);
 546 }
 547
 548 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
 549 {
 550 #ifdef CONFIG_NET_POLL_CONTROLLER
 551         return netpoll_send_skb(vlan->netpoll, skb);
 552 #else
 553         BUG();
 554         return NETDEV_TX_OK;
 555 #endif
 556 }
 557
 558 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
 559                                       struct net_device *dev)
 560 {
 561         struct macvlan_dev *vlan = netdev_priv(dev);
 562         unsigned int len = skb->len;
 563         int ret;
 564
 565         if (unlikely(netpoll_tx_running(dev)))
 566                 return macvlan_netpoll_send_skb(vlan, skb);
 567
 568         ret = macvlan_queue_xmit(skb, dev);
 569
 570         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 571                 struct vlan_pcpu_stats *pcpu_stats;
 572
 573                 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
 574                 u64_stats_update_begin(&pcpu_stats->syncp);
 575                 pcpu_stats->tx_packets++;
 576                 pcpu_stats->tx_bytes += len;
 577                 u64_stats_update_end(&pcpu_stats->syncp);
 578         } else {
 579                 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
 580         }
 581         return ret;
 582 }
 583
 584 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
 585                                unsigned short type, const void *daddr,
 586                                const void *saddr, unsigned len)
 587 {
 588         const struct macvlan_dev *vlan = netdev_priv(dev);
 589         struct net_device *lowerdev = vlan->lowerdev;
 590
 591         return dev_hard_header(skb, lowerdev, type, daddr,
 592                                saddr ? : dev->dev_addr, len);
 593 }
 594
 595 static const struct header_ops macvlan_hard_header_ops = {
 596         .create         = macvlan_hard_header,
 597         .parse          = eth_header_parse,
 598         .cache          = eth_header_cache,
 599         .cache_update   = eth_header_cache_update,
 600 };
 601
 602 static int macvlan_open(struct net_device *dev)
 603 {
 604         struct macvlan_dev *vlan = netdev_priv(dev);
 605         struct net_device *lowerdev = vlan->lowerdev;
 606         int err;
 607
 608         if (macvlan_passthru(vlan->port)) {
 609                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
 610                         err = dev_set_promiscuity(lowerdev, 1);
 611                         if (err < 0)
 612                                 goto out;
 613                 }
 614                 goto hash_add;
 615         }
 616
 617         err = -EADDRINUSE;
 618         if (macvlan_addr_busy(vlan->port, dev->dev_addr))
 619                 goto out;
 620
 621         /* Attempt to populate accel_priv which is used to offload the L2
 622          * forwarding requests for unicast packets.
 623          */
 624         if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD)
 625                 vlan->accel_priv =
 626                       lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
 627
 628         /* If earlier attempt to offload failed, or accel_priv is not
 629          * populated we must add the unicast address to the lower device.
 630          */
 631         if (IS_ERR_OR_NULL(vlan->accel_priv)) {
 632                 vlan->accel_priv = NULL;
 633                 err = dev_uc_add(lowerdev, dev->dev_addr);
 634                 if (err < 0)
 635                         goto out;
 636         }
 637
 638         if (dev->flags & IFF_ALLMULTI) {
 639                 err = dev_set_allmulti(lowerdev, 1);
 640                 if (err < 0)
 641                         goto del_unicast;
 642         }
 643
 644         if (dev->flags & IFF_PROMISC) {
 645                 err = dev_set_promiscuity(lowerdev, 1);
 646                 if (err < 0)
 647                         goto clear_multi;
 648         }
 649
 650 hash_add:
 651         macvlan_hash_add(vlan);
 652         return 0;
 653
 654 clear_multi:
 655         if (dev->flags & IFF_ALLMULTI)
 656                 dev_set_allmulti(lowerdev, -1);
 657 del_unicast:
 658         if (vlan->accel_priv) {
 659                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
 660                                                            vlan->accel_priv);
 661                 vlan->accel_priv = NULL;
 662         } else {
 663                 dev_uc_del(lowerdev, dev->dev_addr);
 664         }
 665 out:
 666         return err;
 667 }
 668
 669 static int macvlan_stop(struct net_device *dev)
 670 {
 671         struct macvlan_dev *vlan = netdev_priv(dev);
 672         struct net_device *lowerdev = vlan->lowerdev;
 673
 674         if (vlan->accel_priv) {
 675                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
 676                                                            vlan->accel_priv);
 677                 vlan->accel_priv = NULL;
 678         }
 679
 680         dev_uc_unsync(lowerdev, dev);
 681         dev_mc_unsync(lowerdev, dev);
 682
 683         if (macvlan_passthru(vlan->port)) {
 684                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
 685                         dev_set_promiscuity(lowerdev, -1);
 686                 goto hash_del;
 687         }
 688
 689         if (dev->flags & IFF_ALLMULTI)
 690                 dev_set_allmulti(lowerdev, -1);
 691
 692         if (dev->flags & IFF_PROMISC)
 693                 dev_set_promiscuity(lowerdev, -1);
 694
 695         dev_uc_del(lowerdev, dev->dev_addr);
 696
 697 hash_del:
 698         macvlan_hash_del(vlan, !dev->dismantle);
 699         return 0;
 700 }
 701
 702 static int macvlan_sync_address(struct net_device *dev, 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                 ether_addr_copy(dev->dev_addr, 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_do_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_do_ioctl)
 850                         err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
 851                 break;
 852         }
 853
 854         if (!err)
 855                 ifr->ifr_ifru = ifrr.ifr_ifru;
 856
 857         return err;
 858 }
 859
 860 /*
 861  * macvlan network devices have devices nesting below it and are a special
 862  * "super class" of normal network devices; split their locks off into a
 863  * separate class since they always nest.
 864  */
 865 static struct lock_class_key macvlan_netdev_addr_lock_key;
 866
 867 #define ALWAYS_ON_OFFLOADS \
 868         (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | \
 869          NETIF_F_GSO_ROBUST | NETIF_F_GSO_ENCAP_ALL)
 870
 871 #define ALWAYS_ON_FEATURES (ALWAYS_ON_OFFLOADS | NETIF_F_LLTX)
 872
 873 #define MACVLAN_FEATURES \
 874         (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
 875          NETIF_F_GSO | NETIF_F_TSO | NETIF_F_LRO | \
 876          NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
 877          NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
 878
 879 #define MACVLAN_STATE_MASK \
 880         ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
 881
 882 static void macvlan_set_lockdep_class(struct net_device *dev)
 883 {
 884         netdev_lockdep_set_classes(dev);
 885         lockdep_set_class(&dev->addr_list_lock,
 886                           &macvlan_netdev_addr_lock_key);
 887 }
 888
 889 static int macvlan_init(struct net_device *dev)
 890 {
 891         struct macvlan_dev *vlan = netdev_priv(dev);
 892         const struct net_device *lowerdev = vlan->lowerdev;
 893         struct macvlan_port *port = vlan->port;
 894
 895         dev->state              = (dev->state & ~MACVLAN_STATE_MASK) |
 896                                   (lowerdev->state & MACVLAN_STATE_MASK);
 897         dev->features           = lowerdev->features & MACVLAN_FEATURES;
 898         dev->features           |= ALWAYS_ON_FEATURES;
 899         dev->hw_features        |= NETIF_F_LRO;
 900         dev->vlan_features      = lowerdev->vlan_features & MACVLAN_FEATURES;
 901         dev->vlan_features      |= ALWAYS_ON_OFFLOADS;
 902         dev->hw_enc_features    |= dev->features;
 903         dev->gso_max_size       = lowerdev->gso_max_size;
 904         dev->gso_max_segs       = lowerdev->gso_max_segs;
 905         dev->hard_header_len    = lowerdev->hard_header_len;
 906         macvlan_set_lockdep_class(dev);
 907
 908         vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
 909         if (!vlan->pcpu_stats)
 910                 return -ENOMEM;
 911
 912         port->count += 1;
 913
 914         return 0;
 915 }
 916
 917 static void macvlan_uninit(struct net_device *dev)
 918 {
 919         struct macvlan_dev *vlan = netdev_priv(dev);
 920         struct macvlan_port *port = vlan->port;
 921
 922         free_percpu(vlan->pcpu_stats);
 923
 924         macvlan_flush_sources(port, vlan);
 925         port->count -= 1;
 926         if (!port->count)
 927                 macvlan_port_destroy(port->dev);
 928 }
 929
 930 static void macvlan_dev_get_stats64(struct net_device *dev,
 931                                     struct rtnl_link_stats64 *stats)
 932 {
 933         struct macvlan_dev *vlan = netdev_priv(dev);
 934
 935         if (vlan->pcpu_stats) {
 936                 struct vlan_pcpu_stats *p;
 937                 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
 938                 u32 rx_errors = 0, tx_dropped = 0;
 939                 unsigned int start;
 940                 int i;
 941
 942                 for_each_possible_cpu(i) {
 943                         p = per_cpu_ptr(vlan->pcpu_stats, i);
 944                         do {
 945                                 start = u64_stats_fetch_begin_irq(&p->syncp);
 946                                 rx_packets      = p->rx_packets;
 947                                 rx_bytes        = p->rx_bytes;
 948                                 rx_multicast    = p->rx_multicast;
 949                                 tx_packets      = p->tx_packets;
 950                                 tx_bytes        = p->tx_bytes;
 951                         } while (u64_stats_fetch_retry_irq(&p->syncp, start));
 952
 953                         stats->rx_packets       += rx_packets;
 954                         stats->rx_bytes         += rx_bytes;
 955                         stats->multicast        += rx_multicast;
 956                         stats->tx_packets       += tx_packets;
 957                         stats->tx_bytes         += tx_bytes;
 958                         /* rx_errors & tx_dropped are u32, updated
 959                          * without syncp protection.
 960                          */
 961                         rx_errors       += p->rx_errors;
 962                         tx_dropped      += p->tx_dropped;
 963                 }
 964                 stats->rx_errors        = rx_errors;
 965                 stats->rx_dropped       = rx_errors;
 966                 stats->tx_dropped       = tx_dropped;
 967         }
 968 }
 969
 970 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
 971                                    __be16 proto, u16 vid)
 972 {
 973         struct macvlan_dev *vlan = netdev_priv(dev);
 974         struct net_device *lowerdev = vlan->lowerdev;
 975
 976         return vlan_vid_add(lowerdev, proto, vid);
 977 }
 978
 979 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
 980                                     __be16 proto, u16 vid)
 981 {
 982         struct macvlan_dev *vlan = netdev_priv(dev);
 983         struct net_device *lowerdev = vlan->lowerdev;
 984
 985         vlan_vid_del(lowerdev, proto, vid);
 986         return 0;
 987 }
 988
 989 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 990                            struct net_device *dev,
 991                            const unsigned char *addr, u16 vid,
 992                            u16 flags,
 993                            struct netlink_ext_ack *extack)
 994 {
 995         struct macvlan_dev *vlan = netdev_priv(dev);
 996         int err = -EINVAL;
 997
 998         /* Support unicast filter only on passthru devices.
 999          * Multicast filter should be allowed on all devices.
1000          */
1001         if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
1002                 return -EOPNOTSUPP;
1003
1004         if (flags & NLM_F_REPLACE)
1005                 return -EOPNOTSUPP;
1006
1007         if (is_unicast_ether_addr(addr))
1008                 err = dev_uc_add_excl(dev, addr);
1009         else if (is_multicast_ether_addr(addr))
1010                 err = dev_mc_add_excl(dev, addr);
1011
1012         return err;
1013 }
1014
1015 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
1016                            struct net_device *dev,
1017                            const unsigned char *addr, u16 vid)
1018 {
1019         struct macvlan_dev *vlan = netdev_priv(dev);
1020         int err = -EINVAL;
1021
1022         /* Support unicast filter only on passthru devices.
1023          * Multicast filter should be allowed on all devices.
1024          */
1025         if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
1026                 return -EOPNOTSUPP;
1027
1028         if (is_unicast_ether_addr(addr))
1029                 err = dev_uc_del(dev, addr);
1030         else if (is_multicast_ether_addr(addr))
1031                 err = dev_mc_del(dev, addr);
1032
1033         return err;
1034 }
1035
1036 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
1037                                         struct ethtool_drvinfo *drvinfo)
1038 {
1039         strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
1040         strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
1041 }
1042
1043 static int macvlan_ethtool_get_link_ksettings(struct net_device *dev,
1044                                               struct ethtool_link_ksettings *cmd)
1045 {
1046         const struct macvlan_dev *vlan = netdev_priv(dev);
1047
1048         return __ethtool_get_link_ksettings(vlan->lowerdev, cmd);
1049 }
1050
1051 static int macvlan_ethtool_get_ts_info(struct net_device *dev,
1052                                        struct ethtool_ts_info *info)
1053 {
1054         struct net_device *real_dev = macvlan_dev_real_dev(dev);
1055         const struct ethtool_ops *ops = real_dev->ethtool_ops;
1056         struct phy_device *phydev = real_dev->phydev;
1057
1058         if (phy_has_tsinfo(phydev)) {
1059                 return phy_ts_info(phydev, info);
1060         } else if (ops->get_ts_info) {
1061                 return ops->get_ts_info(real_dev, info);
1062         } else {
1063                 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
1064                         SOF_TIMESTAMPING_SOFTWARE;
1065                 info->phc_index = -1;
1066         }
1067
1068         return 0;
1069 }
1070
1071 static netdev_features_t macvlan_fix_features(struct net_device *dev,
1072                                               netdev_features_t features)
1073 {
1074         struct macvlan_dev *vlan = netdev_priv(dev);
1075         netdev_features_t lowerdev_features = vlan->lowerdev->features;
1076         netdev_features_t mask;
1077
1078         features |= NETIF_F_ALL_FOR_ALL;
1079         features &= (vlan->set_features | ~MACVLAN_FEATURES);
1080         mask = features;
1081
1082         lowerdev_features &= (features | ~NETIF_F_LRO);
1083         features = netdev_increment_features(lowerdev_features, features, mask);
1084         features |= ALWAYS_ON_FEATURES;
1085         features &= (ALWAYS_ON_FEATURES | MACVLAN_FEATURES);
1086
1087         return features;
1088 }
1089
1090 #ifdef CONFIG_NET_POLL_CONTROLLER
1091 static void macvlan_dev_poll_controller(struct net_device *dev)
1092 {
1093         return;
1094 }
1095
1096 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
1097 {
1098         struct macvlan_dev *vlan = netdev_priv(dev);
1099         struct net_device *real_dev = vlan->lowerdev;
1100         struct netpoll *netpoll;
1101         int err;
1102
1103         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
1104         err = -ENOMEM;
1105         if (!netpoll)
1106                 goto out;
1107
1108         err = __netpoll_setup(netpoll, real_dev);
1109         if (err) {
1110                 kfree(netpoll);
1111                 goto out;
1112         }
1113
1114         vlan->netpoll = netpoll;
1115
1116 out:
1117         return err;
1118 }
1119
1120 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
1121 {
1122         struct macvlan_dev *vlan = netdev_priv(dev);
1123         struct netpoll *netpoll = vlan->netpoll;
1124
1125         if (!netpoll)
1126                 return;
1127
1128         vlan->netpoll = NULL;
1129
1130         __netpoll_free(netpoll);
1131 }
1132 #endif  /* CONFIG_NET_POLL_CONTROLLER */
1133
1134 static int macvlan_dev_get_iflink(const struct net_device *dev)
1135 {
1136         struct macvlan_dev *vlan = netdev_priv(dev);
1137
1138         return vlan->lowerdev->ifindex;
1139 }
1140
1141 static const struct ethtool_ops macvlan_ethtool_ops = {
1142         .get_link               = ethtool_op_get_link,
1143         .get_link_ksettings     = macvlan_ethtool_get_link_ksettings,
1144         .get_drvinfo            = macvlan_ethtool_get_drvinfo,
1145         .get_ts_info            = macvlan_ethtool_get_ts_info,
1146 };
1147
1148 static const struct net_device_ops macvlan_netdev_ops = {
1149         .ndo_init               = macvlan_init,
1150         .ndo_uninit             = macvlan_uninit,
1151         .ndo_open               = macvlan_open,
1152         .ndo_stop               = macvlan_stop,
1153         .ndo_start_xmit         = macvlan_start_xmit,
1154         .ndo_change_mtu         = macvlan_change_mtu,
1155         .ndo_do_ioctl           = macvlan_do_ioctl,
1156         .ndo_fix_features       = macvlan_fix_features,
1157         .ndo_change_rx_flags    = macvlan_change_rx_flags,
1158         .ndo_set_mac_address    = macvlan_set_mac_address,
1159         .ndo_set_rx_mode        = macvlan_set_mac_lists,
1160         .ndo_get_stats64        = macvlan_dev_get_stats64,
1161         .ndo_validate_addr      = eth_validate_addr,
1162         .ndo_vlan_rx_add_vid    = macvlan_vlan_rx_add_vid,
1163         .ndo_vlan_rx_kill_vid   = macvlan_vlan_rx_kill_vid,
1164         .ndo_fdb_add            = macvlan_fdb_add,
1165         .ndo_fdb_del            = macvlan_fdb_del,
1166         .ndo_fdb_dump           = ndo_dflt_fdb_dump,
1167 #ifdef CONFIG_NET_POLL_CONTROLLER
1168         .ndo_poll_controller    = macvlan_dev_poll_controller,
1169         .ndo_netpoll_setup      = macvlan_dev_netpoll_setup,
1170         .ndo_netpoll_cleanup    = macvlan_dev_netpoll_cleanup,
1171 #endif
1172         .ndo_get_iflink         = macvlan_dev_get_iflink,
1173         .ndo_features_check     = passthru_features_check,
1174         .ndo_change_proto_down  = dev_change_proto_down_generic,
1175 };
1176
1177 void macvlan_common_setup(struct net_device *dev)
1178 {
1179         ether_setup(dev);
1180
1181         dev->min_mtu            = 0;
1182         dev->max_mtu            = ETH_MAX_MTU;
1183         dev->priv_flags        &= ~IFF_TX_SKB_SHARING;
1184         netif_keep_dst(dev);
1185         dev->priv_flags        |= IFF_UNICAST_FLT;
1186         dev->netdev_ops         = &macvlan_netdev_ops;
1187         dev->needs_free_netdev  = true;
1188         dev->header_ops         = &macvlan_hard_header_ops;
1189         dev->ethtool_ops        = &macvlan_ethtool_ops;
1190 }
1191 EXPORT_SYMBOL_GPL(macvlan_common_setup);
1192
1193 static void macvlan_setup(struct net_device *dev)
1194 {
1195         macvlan_common_setup(dev);
1196         dev->priv_flags |= IFF_NO_QUEUE;
1197 }
1198
1199 static int macvlan_port_create(struct net_device *dev)
1200 {
1201         struct macvlan_port *port;
1202         unsigned int i;
1203         int err;
1204
1205         if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1206                 return -EINVAL;
1207
1208         if (netdev_is_rx_handler_busy(dev))
1209                 return -EBUSY;
1210
1211         port = kzalloc(sizeof(*port), GFP_KERNEL);
1212         if (port == NULL)
1213                 return -ENOMEM;
1214
1215         port->dev = dev;
1216         ether_addr_copy(port->perm_addr, dev->dev_addr);
1217         INIT_LIST_HEAD(&port->vlans);
1218         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1219                 INIT_HLIST_HEAD(&port->vlan_hash[i]);
1220         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1221                 INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1222
1223         port->bc_queue_len_used = 0;
1224         skb_queue_head_init(&port->bc_queue);
1225         INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1226
1227         err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1228         if (err)
1229                 kfree(port);
1230         else
1231                 dev->priv_flags |= IFF_MACVLAN_PORT;
1232         return err;
1233 }
1234
1235 static void macvlan_port_destroy(struct net_device *dev)
1236 {
1237         struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1238         struct sk_buff *skb;
1239
1240         dev->priv_flags &= ~IFF_MACVLAN_PORT;
1241         netdev_rx_handler_unregister(dev);
1242
1243         /* After this point, no packet can schedule bc_work anymore,
1244          * but we need to cancel it and purge left skbs if any.
1245          */
1246         cancel_work_sync(&port->bc_work);
1247
1248         while ((skb = __skb_dequeue(&port->bc_queue))) {
1249                 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
1250
1251                 if (src)
1252                         dev_put(src->dev);
1253
1254                 kfree_skb(skb);
1255         }
1256
1257         /* If the lower device address has been changed by passthru
1258          * macvlan, put it back.
1259          */
1260         if (macvlan_passthru(port) &&
1261             !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) {
1262                 struct sockaddr sa;
1263
1264                 sa.sa_family = port->dev->type;
1265                 memcpy(&sa.sa_data, port->perm_addr, port->dev->addr_len);
1266                 dev_set_mac_address(port->dev, &sa, NULL);
1267         }
1268
1269         kfree(port);
1270 }
1271
1272 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[],
1273                             struct netlink_ext_ack *extack)
1274 {
1275         struct nlattr *nla, *head;
1276         int rem, len;
1277
1278         if (tb[IFLA_ADDRESS]) {
1279                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1280                         return -EINVAL;
1281                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1282                         return -EADDRNOTAVAIL;
1283         }
1284
1285         if (!data)
1286                 return 0;
1287
1288         if (data[IFLA_MACVLAN_FLAGS] &&
1289             nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
1290                 return -EINVAL;
1291
1292         if (data[IFLA_MACVLAN_MODE]) {
1293                 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1294                 case MACVLAN_MODE_PRIVATE:
1295                 case MACVLAN_MODE_VEPA:
1296                 case MACVLAN_MODE_BRIDGE:
1297                 case MACVLAN_MODE_PASSTHRU:
1298                 case MACVLAN_MODE_SOURCE:
1299                         break;
1300                 default:
1301                         return -EINVAL;
1302                 }
1303         }
1304
1305         if (data[IFLA_MACVLAN_MACADDR_MODE]) {
1306                 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1307                 case MACVLAN_MACADDR_ADD:
1308                 case MACVLAN_MACADDR_DEL:
1309                 case MACVLAN_MACADDR_FLUSH:
1310                 case MACVLAN_MACADDR_SET:
1311                         break;
1312                 default:
1313                         return -EINVAL;
1314                 }
1315         }
1316
1317         if (data[IFLA_MACVLAN_MACADDR]) {
1318                 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1319                         return -EINVAL;
1320
1321                 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1322                         return -EADDRNOTAVAIL;
1323         }
1324
1325         if (data[IFLA_MACVLAN_MACADDR_DATA]) {
1326                 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1327                 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1328
1329                 nla_for_each_attr(nla, head, len, rem) {
1330                         if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1331                             nla_len(nla) != ETH_ALEN)
1332                                 return -EINVAL;
1333
1334                         if (!is_valid_ether_addr(nla_data(nla)))
1335                                 return -EADDRNOTAVAIL;
1336                 }
1337         }
1338
1339         if (data[IFLA_MACVLAN_MACADDR_COUNT])
1340                 return -EINVAL;
1341
1342         return 0;
1343 }
1344
1345 /*
1346  * reconfigure list of remote source mac address
1347  * (only for macvlan devices in source mode)
1348  * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1349  * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1350  */
1351 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1352                                       struct nlattr *data[])
1353 {
1354         char *addr = NULL;
1355         int ret, rem, len;
1356         struct nlattr *nla, *head;
1357         struct macvlan_source_entry *entry;
1358
1359         if (data[IFLA_MACVLAN_MACADDR])
1360                 addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1361
1362         if (mode == MACVLAN_MACADDR_ADD) {
1363                 if (!addr)
1364                         return -EINVAL;
1365
1366                 return macvlan_hash_add_source(vlan, addr);
1367
1368         } else if (mode == MACVLAN_MACADDR_DEL) {
1369                 if (!addr)
1370                         return -EINVAL;
1371
1372                 entry = macvlan_hash_lookup_source(vlan, addr);
1373                 if (entry) {
1374                         macvlan_hash_del_source(entry);
1375                         vlan->macaddr_count--;
1376                 }
1377         } else if (mode == MACVLAN_MACADDR_FLUSH) {
1378                 macvlan_flush_sources(vlan->port, vlan);
1379         } else if (mode == MACVLAN_MACADDR_SET) {
1380                 macvlan_flush_sources(vlan->port, vlan);
1381
1382                 if (addr) {
1383                         ret = macvlan_hash_add_source(vlan, addr);
1384                         if (ret)
1385                                 return ret;
1386                 }
1387
1388                 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA])
1389                         return 0;
1390
1391                 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1392                 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1393
1394                 nla_for_each_attr(nla, head, len, rem) {
1395                         addr = nla_data(nla);
1396                         ret = macvlan_hash_add_source(vlan, addr);
1397                         if (ret)
1398                                 return ret;
1399                 }
1400         } else {
1401                 return -EINVAL;
1402         }
1403
1404         return 0;
1405 }
1406
1407 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1408                            struct nlattr *tb[], struct nlattr *data[],
1409                            struct netlink_ext_ack *extack)
1410 {
1411         struct macvlan_dev *vlan = netdev_priv(dev);
1412         struct macvlan_port *port;
1413         struct net_device *lowerdev;
1414         int err;
1415         int macmode;
1416         bool create = false;
1417
1418         if (!tb[IFLA_LINK])
1419                 return -EINVAL;
1420
1421         lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1422         if (lowerdev == NULL)
1423                 return -ENODEV;
1424
1425         /* When creating macvlans or macvtaps on top of other macvlans - use
1426          * the real device as the lowerdev.
1427          */
1428         if (netif_is_macvlan(lowerdev))
1429                 lowerdev = macvlan_dev_real_dev(lowerdev);
1430
1431         if (!tb[IFLA_MTU])
1432                 dev->mtu = lowerdev->mtu;
1433         else if (dev->mtu > lowerdev->mtu)
1434                 return -EINVAL;
1435
1436         /* MTU range: 68 - lowerdev->max_mtu */
1437         dev->min_mtu = ETH_MIN_MTU;
1438         dev->max_mtu = lowerdev->max_mtu;
1439
1440         if (!tb[IFLA_ADDRESS])
1441                 eth_hw_addr_random(dev);
1442
1443         if (!netif_is_macvlan_port(lowerdev)) {
1444                 err = macvlan_port_create(lowerdev);
1445                 if (err < 0)
1446                         return err;
1447                 create = true;
1448         }
1449         port = macvlan_port_get_rtnl(lowerdev);
1450
1451         /* Only 1 macvlan device can be created in passthru mode */
1452         if (macvlan_passthru(port)) {
1453                 /* The macvlan port must be not created this time,
1454                  * still goto destroy_macvlan_port for readability.
1455                  */
1456                 err = -EINVAL;
1457                 goto destroy_macvlan_port;
1458         }
1459
1460         vlan->lowerdev = lowerdev;
1461         vlan->dev      = dev;
1462         vlan->port     = port;
1463         vlan->set_features = MACVLAN_FEATURES;
1464
1465         vlan->mode     = MACVLAN_MODE_VEPA;
1466         if (data && data[IFLA_MACVLAN_MODE])
1467                 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1468
1469         if (data && data[IFLA_MACVLAN_FLAGS])
1470                 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1471
1472         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1473                 if (port->count) {
1474                         err = -EINVAL;
1475                         goto destroy_macvlan_port;
1476                 }
1477                 macvlan_set_passthru(port);
1478                 eth_hw_addr_inherit(dev, lowerdev);
1479         }
1480
1481         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1482                 if (vlan->mode != MACVLAN_MODE_SOURCE) {
1483                         err = -EINVAL;
1484                         goto destroy_macvlan_port;
1485                 }
1486                 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1487                 err = macvlan_changelink_sources(vlan, macmode, data);
1488                 if (err)
1489                         goto destroy_macvlan_port;
1490         }
1491
1492         vlan->bc_queue_len_req = MACVLAN_DEFAULT_BC_QUEUE_LEN;
1493         if (data && data[IFLA_MACVLAN_BC_QUEUE_LEN])
1494                 vlan->bc_queue_len_req = nla_get_u32(data[IFLA_MACVLAN_BC_QUEUE_LEN]);
1495
1496         err = register_netdevice(dev);
1497         if (err < 0)
1498                 goto destroy_macvlan_port;
1499
1500         dev->priv_flags |= IFF_MACVLAN;
1501         err = netdev_upper_dev_link(lowerdev, dev, extack);
1502         if (err)
1503                 goto unregister_netdev;
1504
1505         list_add_tail_rcu(&vlan->list, &port->vlans);
1506         update_port_bc_queue_len(vlan->port);
1507         netif_stacked_transfer_operstate(lowerdev, dev);
1508         linkwatch_fire_event(dev);
1509
1510         return 0;
1511
1512 unregister_netdev:
1513         /* macvlan_uninit would free the macvlan port */
1514         unregister_netdevice(dev);
1515         return err;
1516 destroy_macvlan_port:
1517         /* the macvlan port may be freed by macvlan_uninit when fail to register.
1518          * so we destroy the macvlan port only when it's valid.
1519          */
1520         if (create && macvlan_port_get_rtnl(lowerdev))
1521                 macvlan_port_destroy(port->dev);
1522         return err;
1523 }
1524 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1525
1526 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1527                            struct nlattr *tb[], struct nlattr *data[],
1528                            struct netlink_ext_ack *extack)
1529 {
1530         return macvlan_common_newlink(src_net, dev, tb, data, extack);
1531 }
1532
1533 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1534 {
1535         struct macvlan_dev *vlan = netdev_priv(dev);
1536
1537         if (vlan->mode == MACVLAN_MODE_SOURCE)
1538                 macvlan_flush_sources(vlan->port, vlan);
1539         list_del_rcu(&vlan->list);
1540         update_port_bc_queue_len(vlan->port);
1541         unregister_netdevice_queue(dev, head);
1542         netdev_upper_dev_unlink(vlan->lowerdev, dev);
1543 }
1544 EXPORT_SYMBOL_GPL(macvlan_dellink);
1545
1546 static int macvlan_changelink(struct net_device *dev,
1547                               struct nlattr *tb[], struct nlattr *data[],
1548                               struct netlink_ext_ack *extack)
1549 {
1550         struct macvlan_dev *vlan = netdev_priv(dev);
1551         enum macvlan_mode mode;
1552         bool set_mode = false;
1553         enum macvlan_macaddr_mode macmode;
1554         int ret;
1555
1556         /* Validate mode, but don't set yet: setting flags may fail. */
1557         if (data && data[IFLA_MACVLAN_MODE]) {
1558                 set_mode = true;
1559                 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1560                 /* Passthrough mode can't be set or cleared dynamically */
1561                 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1562                     (vlan->mode == MACVLAN_MODE_PASSTHRU))
1563                         return -EINVAL;
1564                 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1565                     vlan->mode != mode)
1566                         macvlan_flush_sources(vlan->port, vlan);
1567         }
1568
1569         if (data && data[IFLA_MACVLAN_FLAGS]) {
1570                 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1571                 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1572                 if (macvlan_passthru(vlan->port) && promisc) {
1573                         int err;
1574
1575                         if (flags & MACVLAN_FLAG_NOPROMISC)
1576                                 err = dev_set_promiscuity(vlan->lowerdev, -1);
1577                         else
1578                                 err = dev_set_promiscuity(vlan->lowerdev, 1);
1579                         if (err < 0)
1580                                 return err;
1581                 }
1582                 vlan->flags = flags;
1583         }
1584
1585         if (data && data[IFLA_MACVLAN_BC_QUEUE_LEN]) {
1586                 vlan->bc_queue_len_req = nla_get_u32(data[IFLA_MACVLAN_BC_QUEUE_LEN]);
1587                 update_port_bc_queue_len(vlan->port);
1588         }
1589
1590         if (set_mode)
1591                 vlan->mode = mode;
1592         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1593                 if (vlan->mode != MACVLAN_MODE_SOURCE)
1594                         return -EINVAL;
1595                 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1596                 ret = macvlan_changelink_sources(vlan, macmode, data);
1597                 if (ret)
1598                         return ret;
1599         }
1600         return 0;
1601 }
1602
1603 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1604 {
1605         if (vlan->macaddr_count == 0)
1606                 return 0;
1607         return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1608                 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1609 }
1610
1611 static size_t macvlan_get_size(const struct net_device *dev)
1612 {
1613         struct macvlan_dev *vlan = netdev_priv(dev);
1614
1615         return (0
1616                 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1617                 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1618                 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1619                 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1620                 + nla_total_size(4) /* IFLA_MACVLAN_BC_QUEUE_LEN */
1621                 + nla_total_size(4) /* IFLA_MACVLAN_BC_QUEUE_LEN_USED */
1622                 );
1623 }
1624
1625 static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1626                                      const struct macvlan_dev *vlan,
1627                                      const int i)
1628 {
1629         struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1630         struct macvlan_source_entry *entry;
1631
1632         hlist_for_each_entry_rcu(entry, h, hlist) {
1633                 if (entry->vlan != vlan)
1634                         continue;
1635                 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1636                         return 1;
1637         }
1638         return 0;
1639 }
1640
1641 static int macvlan_fill_info(struct sk_buff *skb,
1642                                 const struct net_device *dev)
1643 {
1644         struct macvlan_dev *vlan = netdev_priv(dev);
1645         struct macvlan_port *port = vlan->port;
1646         int i;
1647         struct nlattr *nest;
1648
1649         if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1650                 goto nla_put_failure;
1651         if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1652                 goto nla_put_failure;
1653         if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1654                 goto nla_put_failure;
1655         if (vlan->macaddr_count > 0) {
1656                 nest = nla_nest_start_noflag(skb, IFLA_MACVLAN_MACADDR_DATA);
1657                 if (nest == NULL)
1658                         goto nla_put_failure;
1659
1660                 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1661                         if (macvlan_fill_info_macaddr(skb, vlan, i))
1662                                 goto nla_put_failure;
1663                 }
1664                 nla_nest_end(skb, nest);
1665         }
1666         if (nla_put_u32(skb, IFLA_MACVLAN_BC_QUEUE_LEN, vlan->bc_queue_len_req))
1667                 goto nla_put_failure;
1668         if (nla_put_u32(skb, IFLA_MACVLAN_BC_QUEUE_LEN_USED, port->bc_queue_len_used))
1669                 goto nla_put_failure;
1670         return 0;
1671
1672 nla_put_failure:
1673         return -EMSGSIZE;
1674 }
1675
1676 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1677         [IFLA_MACVLAN_MODE]  = { .type = NLA_U32 },
1678         [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1679         [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1680         [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1681         [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1682         [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1683         [IFLA_MACVLAN_BC_QUEUE_LEN] = { .type = NLA_U32 },
1684         [IFLA_MACVLAN_BC_QUEUE_LEN_USED] = { .type = NLA_REJECT },
1685 };
1686
1687 int macvlan_link_register(struct rtnl_link_ops *ops)
1688 {
1689         /* common fields */
1690         ops->validate           = macvlan_validate;
1691         ops->maxtype            = IFLA_MACVLAN_MAX;
1692         ops->policy             = macvlan_policy;
1693         ops->changelink         = macvlan_changelink;
1694         ops->get_size           = macvlan_get_size;
1695         ops->fill_info          = macvlan_fill_info;
1696
1697         return rtnl_link_register(ops);
1698 };
1699 EXPORT_SYMBOL_GPL(macvlan_link_register);
1700
1701 static struct net *macvlan_get_link_net(const struct net_device *dev)
1702 {
1703         return dev_net(macvlan_dev_real_dev(dev));
1704 }
1705
1706 static struct rtnl_link_ops macvlan_link_ops = {
1707         .kind           = "macvlan",
1708         .setup          = macvlan_setup,
1709         .newlink        = macvlan_newlink,
1710         .dellink        = macvlan_dellink,
1711         .get_link_net   = macvlan_get_link_net,
1712         .priv_size      = sizeof(struct macvlan_dev),
1713 };
1714
1715 static void update_port_bc_queue_len(struct macvlan_port *port)
1716 {
1717         u32 max_bc_queue_len_req = 0;
1718         struct macvlan_dev *vlan;
1719
1720         list_for_each_entry(vlan, &port->vlans, list) {
1721                 if (vlan->bc_queue_len_req > max_bc_queue_len_req)
1722                         max_bc_queue_len_req = vlan->bc_queue_len_req;
1723         }
1724         port->bc_queue_len_used = max_bc_queue_len_req;
1725 }
1726
1727 static int macvlan_device_event(struct notifier_block *unused,
1728                                 unsigned long event, void *ptr)
1729 {
1730         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1731         struct macvlan_dev *vlan, *next;
1732         struct macvlan_port *port;
1733         LIST_HEAD(list_kill);
1734
1735         if (!netif_is_macvlan_port(dev))
1736                 return NOTIFY_DONE;
1737
1738         port = macvlan_port_get_rtnl(dev);
1739
1740         switch (event) {
1741         case NETDEV_UP:
1742         case NETDEV_DOWN:
1743         case NETDEV_CHANGE:
1744                 list_for_each_entry(vlan, &port->vlans, list)
1745                         netif_stacked_transfer_operstate(vlan->lowerdev,
1746                                                          vlan->dev);
1747                 break;
1748         case NETDEV_FEAT_CHANGE:
1749                 list_for_each_entry(vlan, &port->vlans, list) {
1750                         vlan->dev->gso_max_size = dev->gso_max_size;
1751                         vlan->dev->gso_max_segs = dev->gso_max_segs;
1752                         netdev_update_features(vlan->dev);
1753                 }
1754                 break;
1755         case NETDEV_CHANGEMTU:
1756                 list_for_each_entry(vlan, &port->vlans, list) {
1757                         if (vlan->dev->mtu <= dev->mtu)
1758                                 continue;
1759                         dev_set_mtu(vlan->dev, dev->mtu);
1760                 }
1761                 break;
1762         case NETDEV_CHANGEADDR:
1763                 if (!macvlan_passthru(port))
1764                         return NOTIFY_DONE;
1765
1766                 vlan = list_first_entry_or_null(&port->vlans,
1767                                                 struct macvlan_dev,
1768                                                 list);
1769
1770                 if (vlan && macvlan_sync_address(vlan->dev, dev->dev_addr))
1771                         return NOTIFY_BAD;
1772
1773                 break;
1774         case NETDEV_UNREGISTER:
1775                 /* twiddle thumbs on netns device moves */
1776                 if (dev->reg_state != NETREG_UNREGISTERING)
1777                         break;
1778
1779                 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1780                         vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1781                 unregister_netdevice_many(&list_kill);
1782                 break;
1783         case NETDEV_PRE_TYPE_CHANGE:
1784                 /* Forbid underlaying device to change its type. */
1785                 return NOTIFY_BAD;
1786
1787         case NETDEV_NOTIFY_PEERS:
1788         case NETDEV_BONDING_FAILOVER:
1789         case NETDEV_RESEND_IGMP:
1790                 /* Propagate to all vlans */
1791                 list_for_each_entry(vlan, &port->vlans, list)
1792                         call_netdevice_notifiers(event, vlan->dev);
1793         }
1794         return NOTIFY_DONE;
1795 }
1796
1797 static struct notifier_block macvlan_notifier_block __read_mostly = {
1798         .notifier_call  = macvlan_device_event,
1799 };
1800
1801 static int __init macvlan_init_module(void)
1802 {
1803         int err;
1804
1805         register_netdevice_notifier(&macvlan_notifier_block);
1806
1807         err = macvlan_link_register(&macvlan_link_ops);
1808         if (err < 0)
1809                 goto err1;
1810         return 0;
1811 err1:
1812         unregister_netdevice_notifier(&macvlan_notifier_block);
1813         return err;
1814 }
1815
1816 static void __exit macvlan_cleanup_module(void)
1817 {
1818         rtnl_link_unregister(&macvlan_link_ops);
1819         unregister_netdevice_notifier(&macvlan_notifier_block);
1820 }
1821
1822 module_init(macvlan_init_module);
1823 module_exit(macvlan_cleanup_module);
1824
1825 MODULE_LICENSE("GPL");
1826 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1827 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1828 MODULE_ALIAS_RTNL_LINK("macvlan");