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         int                     bc_cutoff;
  51         u32                     flags;
  52         int                     count;
  53         struct hlist_head       vlan_source_hash[MACVLAN_HASH_SIZE];
  54         DECLARE_BITMAP(bc_filter, MACVLAN_MC_FILTER_SZ);
  55         DECLARE_BITMAP(mc_filter, MACVLAN_MC_FILTER_SZ);
  56         unsigned char           perm_addr[ETH_ALEN];
  57 };
  58
  59 struct macvlan_source_entry {
  60         struct hlist_node       hlist;
  61         struct macvlan_dev      *vlan;
  62         unsigned char           addr[6+2] __aligned(sizeof(u16));
  63         struct rcu_head         rcu;
  64 };
  65
  66 struct macvlan_skb_cb {
  67         const struct macvlan_dev *src;
  68 };
  69
  70 #define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0]))
  71
  72 static void macvlan_port_destroy(struct net_device *dev);
  73 static void update_port_bc_queue_len(struct macvlan_port *port);
  74
  75 static inline bool macvlan_passthru(const struct macvlan_port *port)
  76 {
  77         return port->flags & MACVLAN_F_PASSTHRU;
  78 }
  79
  80 static inline void macvlan_set_passthru(struct macvlan_port *port)
  81 {
  82         port->flags |= MACVLAN_F_PASSTHRU;
  83 }
  84
  85 static inline bool macvlan_addr_change(const struct macvlan_port *port)
  86 {
  87         return port->flags & MACVLAN_F_ADDRCHANGE;
  88 }
  89
  90 static inline void macvlan_set_addr_change(struct macvlan_port *port)
  91 {
  92         port->flags |= MACVLAN_F_ADDRCHANGE;
  93 }
  94
  95 static inline void macvlan_clear_addr_change(struct macvlan_port *port)
  96 {
  97         port->flags &= ~MACVLAN_F_ADDRCHANGE;
  98 }
  99
 100 /* Hash Ethernet address */
 101 static u32 macvlan_eth_hash(const unsigned char *addr)
 102 {
 103         u64 value = get_unaligned((u64 *)addr);
 104
 105         /* only want 6 bytes */
 106 #ifdef __BIG_ENDIAN
 107         value >>= 16;
 108 #else
 109         value <<= 16;
 110 #endif
 111         return hash_64(value, MACVLAN_HASH_BITS);
 112 }
 113
 114 static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev)
 115 {
 116         return rcu_dereference(dev->rx_handler_data);
 117 }
 118
 119 static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev)
 120 {
 121         return rtnl_dereference(dev->rx_handler_data);
 122 }
 123
 124 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
 125                                                const unsigned char *addr)
 126 {
 127         struct macvlan_dev *vlan;
 128         u32 idx = macvlan_eth_hash(addr);
 129
 130         hlist_for_each_entry_rcu(vlan, &port->vlan_hash[idx], hlist,
 131                                  lockdep_rtnl_is_held()) {
 132                 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr))
 133                         return vlan;
 134         }
 135         return NULL;
 136 }
 137
 138 static struct macvlan_source_entry *macvlan_hash_lookup_source(
 139         const struct macvlan_dev *vlan,
 140         const unsigned char *addr)
 141 {
 142         struct macvlan_source_entry *entry;
 143         u32 idx = macvlan_eth_hash(addr);
 144         struct hlist_head *h = &vlan->port->vlan_source_hash[idx];
 145
 146         hlist_for_each_entry_rcu(entry, h, hlist, lockdep_rtnl_is_held()) {
 147                 if (ether_addr_equal_64bits(entry->addr, addr) &&
 148                     entry->vlan == vlan)
 149                         return entry;
 150         }
 151         return NULL;
 152 }
 153
 154 static int macvlan_hash_add_source(struct macvlan_dev *vlan,
 155                                    const unsigned char *addr)
 156 {
 157         struct macvlan_port *port = vlan->port;
 158         struct macvlan_source_entry *entry;
 159         struct hlist_head *h;
 160
 161         entry = macvlan_hash_lookup_source(vlan, addr);
 162         if (entry)
 163                 return 0;
 164
 165         entry = kmalloc(sizeof(*entry), GFP_KERNEL);
 166         if (!entry)
 167                 return -ENOMEM;
 168
 169         ether_addr_copy(entry->addr, addr);
 170         entry->vlan = vlan;
 171         h = &port->vlan_source_hash[macvlan_eth_hash(addr)];
 172         hlist_add_head_rcu(&entry->hlist, h);
 173         vlan->macaddr_count++;
 174
 175         return 0;
 176 }
 177
 178 static void macvlan_hash_add(struct macvlan_dev *vlan)
 179 {
 180         struct macvlan_port *port = vlan->port;
 181         const unsigned char *addr = vlan->dev->dev_addr;
 182         u32 idx = macvlan_eth_hash(addr);
 183
 184         hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[idx]);
 185 }
 186
 187 static void macvlan_hash_del_source(struct macvlan_source_entry *entry)
 188 {
 189         hlist_del_rcu(&entry->hlist);
 190         kfree_rcu(entry, rcu);
 191 }
 192
 193 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
 194 {
 195         hlist_del_rcu(&vlan->hlist);
 196         if (sync)
 197                 synchronize_rcu();
 198 }
 199
 200 static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
 201                                         const unsigned char *addr)
 202 {
 203         macvlan_hash_del(vlan, true);
 204         /* Now that we are unhashed it is safe to change the device
 205          * address without confusing packet delivery.
 206          */
 207         eth_hw_addr_set(vlan->dev, addr);
 208         macvlan_hash_add(vlan);
 209 }
 210
 211 static bool macvlan_addr_busy(const struct macvlan_port *port,
 212                               const unsigned char *addr)
 213 {
 214         /* Test to see if the specified address is
 215          * currently in use by the underlying device or
 216          * another macvlan.
 217          */
 218         if (!macvlan_passthru(port) && !macvlan_addr_change(port) &&
 219             ether_addr_equal_64bits(port->dev->dev_addr, addr))
 220                 return true;
 221
 222         if (macvlan_hash_lookup(port, addr))
 223                 return true;
 224
 225         return false;
 226 }
 227
 228
 229 static int macvlan_broadcast_one(struct sk_buff *skb,
 230                                  const struct macvlan_dev *vlan,
 231                                  const struct ethhdr *eth, bool local)
 232 {
 233         struct net_device *dev = vlan->dev;
 234
 235         if (local)
 236                 return __dev_forward_skb(dev, skb);
 237
 238         skb->dev = dev;
 239         if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
 240                 skb->pkt_type = PACKET_BROADCAST;
 241         else
 242                 skb->pkt_type = PACKET_MULTICAST;
 243
 244         return 0;
 245 }
 246
 247 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
 248 {
 249         return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT);
 250 }
 251
 252
 253 static unsigned int mc_hash(const struct macvlan_dev *vlan,
 254                             const unsigned char *addr)
 255 {
 256         u32 val = __get_unaligned_cpu32(addr + 2);
 257
 258         val ^= macvlan_hash_mix(vlan);
 259         return hash_32(val, MACVLAN_MC_FILTER_BITS);
 260 }
 261
 262 static void macvlan_broadcast(struct sk_buff *skb,
 263                               const struct macvlan_port *port,
 264                               struct net_device *src,
 265                               enum macvlan_mode mode)
 266 {
 267         const struct ethhdr *eth = eth_hdr(skb);
 268         const struct macvlan_dev *vlan;
 269         struct sk_buff *nskb;
 270         unsigned int i;
 271         int err;
 272         unsigned int hash;
 273
 274         if (skb->protocol == htons(ETH_P_PAUSE))
 275                 return;
 276
 277         hash_for_each_rcu(port->vlan_hash, i, vlan, hlist) {
 278                 if (vlan->dev == src || !(vlan->mode & mode))
 279                         continue;
 280
 281                 hash = mc_hash(vlan, eth->h_dest);
 282                 if (!test_bit(hash, vlan->mc_filter))
 283                         continue;
 284
 285                 err = NET_RX_DROP;
 286                 nskb = skb_clone(skb, GFP_ATOMIC);
 287                 if (likely(nskb))
 288                         err = macvlan_broadcast_one(nskb, vlan, eth,
 289                                         mode == MACVLAN_MODE_BRIDGE) ?:
 290                               netif_rx(nskb);
 291                 macvlan_count_rx(vlan, skb->len + ETH_HLEN,
 292                                  err == NET_RX_SUCCESS, true);
 293         }
 294 }
 295
 296 static void macvlan_multicast_rx(const struct macvlan_port *port,
 297                                  const struct macvlan_dev *src,
 298                                  struct sk_buff *skb)
 299 {
 300         if (!src)
 301                 /* frame comes from an external address */
 302                 macvlan_broadcast(skb, port, NULL,
 303                                   MACVLAN_MODE_PRIVATE |
 304                                   MACVLAN_MODE_VEPA    |
 305                                   MACVLAN_MODE_PASSTHRU|
 306                                   MACVLAN_MODE_BRIDGE);
 307         else if (src->mode == MACVLAN_MODE_VEPA)
 308                 /* flood to everyone except source */
 309                 macvlan_broadcast(skb, port, src->dev,
 310                                   MACVLAN_MODE_VEPA |
 311                                   MACVLAN_MODE_BRIDGE);
 312         else
 313                 /*
 314                  * flood only to VEPA ports, bridge ports
 315                  * already saw the frame on the way out.
 316                  */
 317                 macvlan_broadcast(skb, port, src->dev,
 318                                   MACVLAN_MODE_VEPA);
 319 }
 320
 321 static void macvlan_process_broadcast(struct work_struct *w)
 322 {
 323         struct macvlan_port *port = container_of(w, struct macvlan_port,
 324                                                  bc_work);
 325         struct sk_buff *skb;
 326         struct sk_buff_head list;
 327
 328         __skb_queue_head_init(&list);
 329
 330         spin_lock_bh(&port->bc_queue.lock);
 331         skb_queue_splice_tail_init(&port->bc_queue, &list);
 332         spin_unlock_bh(&port->bc_queue.lock);
 333
 334         while ((skb = __skb_dequeue(&list))) {
 335                 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
 336
 337                 rcu_read_lock();
 338                 macvlan_multicast_rx(port, src, skb);
 339                 rcu_read_unlock();
 340
 341                 if (src)
 342                         dev_put(src->dev);
 343                 consume_skb(skb);
 344
 345                 cond_resched();
 346         }
 347 }
 348
 349 static void macvlan_broadcast_enqueue(struct macvlan_port *port,
 350                                       const struct macvlan_dev *src,
 351                                       struct sk_buff *skb)
 352 {
 353         struct sk_buff *nskb;
 354         int err = -ENOMEM;
 355
 356         nskb = skb_clone(skb, GFP_ATOMIC);
 357         if (!nskb)
 358                 goto err;
 359
 360         MACVLAN_SKB_CB(nskb)->src = src;
 361
 362         spin_lock(&port->bc_queue.lock);
 363         if (skb_queue_len(&port->bc_queue) < port->bc_queue_len_used) {
 364                 if (src)
 365                         dev_hold(src->dev);
 366                 __skb_queue_tail(&port->bc_queue, nskb);
 367                 err = 0;
 368         }
 369         spin_unlock(&port->bc_queue.lock);
 370
 371         queue_work(system_unbound_wq, &port->bc_work);
 372
 373         if (err)
 374                 goto free_nskb;
 375
 376         return;
 377
 378 free_nskb:
 379         kfree_skb(nskb);
 380 err:
 381         dev_core_stats_rx_dropped_inc(skb->dev);
 382 }
 383
 384 static void macvlan_flush_sources(struct macvlan_port *port,
 385                                   struct macvlan_dev *vlan)
 386 {
 387         struct macvlan_source_entry *entry;
 388         struct hlist_node *next;
 389         int i;
 390
 391         hash_for_each_safe(port->vlan_source_hash, i, next, entry, hlist)
 392                 if (entry->vlan == vlan)
 393                         macvlan_hash_del_source(entry);
 394
 395         vlan->macaddr_count = 0;
 396 }
 397
 398 static void macvlan_forward_source_one(struct sk_buff *skb,
 399                                        struct macvlan_dev *vlan)
 400 {
 401         struct sk_buff *nskb;
 402         struct net_device *dev;
 403         int len;
 404         int ret;
 405
 406         dev = vlan->dev;
 407         if (unlikely(!(dev->flags & IFF_UP)))
 408                 return;
 409
 410         nskb = skb_clone(skb, GFP_ATOMIC);
 411         if (!nskb)
 412                 return;
 413
 414         len = nskb->len + ETH_HLEN;
 415         nskb->dev = dev;
 416
 417         if (ether_addr_equal_64bits(eth_hdr(skb)->h_dest, dev->dev_addr))
 418                 nskb->pkt_type = PACKET_HOST;
 419
 420         ret = __netif_rx(nskb);
 421         macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
 422 }
 423
 424 static bool macvlan_forward_source(struct sk_buff *skb,
 425                                    struct macvlan_port *port,
 426                                    const unsigned char *addr)
 427 {
 428         struct macvlan_source_entry *entry;
 429         u32 idx = macvlan_eth_hash(addr);
 430         struct hlist_head *h = &port->vlan_source_hash[idx];
 431         bool consume = false;
 432
 433         hlist_for_each_entry_rcu(entry, h, hlist) {
 434                 if (ether_addr_equal_64bits(entry->addr, addr)) {
 435                         if (entry->vlan->flags & MACVLAN_FLAG_NODST)
 436                                 consume = true;
 437                         macvlan_forward_source_one(skb, entry->vlan);
 438                 }
 439         }
 440
 441         return consume;
 442 }
 443
 444 /* called under rcu_read_lock() from netif_receive_skb */
 445 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
 446 {
 447         struct macvlan_port *port;
 448         struct sk_buff *skb = *pskb;
 449         const struct ethhdr *eth = eth_hdr(skb);
 450         const struct macvlan_dev *vlan;
 451         const struct macvlan_dev *src;
 452         struct net_device *dev;
 453         unsigned int len = 0;
 454         int ret;
 455         rx_handler_result_t handle_res;
 456
 457         /* Packets from dev_loopback_xmit() do not have L2 header, bail out */
 458         if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
 459                 return RX_HANDLER_PASS;
 460
 461         port = macvlan_port_get_rcu(skb->dev);
 462         if (is_multicast_ether_addr(eth->h_dest)) {
 463                 unsigned int hash;
 464
 465                 skb = ip_check_defrag(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN);
 466                 if (!skb)
 467                         return RX_HANDLER_CONSUMED;
 468                 *pskb = skb;
 469                 eth = eth_hdr(skb);
 470                 if (macvlan_forward_source(skb, port, eth->h_source)) {
 471                         kfree_skb(skb);
 472                         return RX_HANDLER_CONSUMED;
 473                 }
 474                 src = macvlan_hash_lookup(port, eth->h_source);
 475                 if (src && src->mode != MACVLAN_MODE_VEPA &&
 476                     src->mode != MACVLAN_MODE_BRIDGE) {
 477                         /* forward to original port. */
 478                         vlan = src;
 479                         ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
 480                               __netif_rx(skb);
 481                         handle_res = RX_HANDLER_CONSUMED;
 482                         goto out;
 483                 }
 484
 485                 hash = mc_hash(NULL, eth->h_dest);
 486                 if (test_bit(hash, port->bc_filter))
 487                         macvlan_broadcast_enqueue(port, src, skb);
 488                 else if (test_bit(hash, port->mc_filter))
 489                         macvlan_multicast_rx(port, src, skb);
 490
 491                 return RX_HANDLER_PASS;
 492         }
 493
 494         if (macvlan_forward_source(skb, port, eth->h_source)) {
 495                 kfree_skb(skb);
 496                 return RX_HANDLER_CONSUMED;
 497         }
 498         if (macvlan_passthru(port))
 499                 vlan = list_first_or_null_rcu(&port->vlans,
 500                                               struct macvlan_dev, list);
 501         else
 502                 vlan = macvlan_hash_lookup(port, eth->h_dest);
 503         if (!vlan || vlan->mode == MACVLAN_MODE_SOURCE)
 504                 return RX_HANDLER_PASS;
 505
 506         dev = vlan->dev;
 507         if (unlikely(!(dev->flags & IFF_UP))) {
 508                 kfree_skb(skb);
 509                 return RX_HANDLER_CONSUMED;
 510         }
 511         len = skb->len + ETH_HLEN;
 512         skb = skb_share_check(skb, GFP_ATOMIC);
 513         if (!skb) {
 514                 ret = NET_RX_DROP;
 515                 handle_res = RX_HANDLER_CONSUMED;
 516                 goto out;
 517         }
 518
 519         *pskb = skb;
 520         skb->dev = dev;
 521         skb->pkt_type = PACKET_HOST;
 522
 523         ret = NET_RX_SUCCESS;
 524         handle_res = RX_HANDLER_ANOTHER;
 525 out:
 526         macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
 527         return handle_res;
 528 }
 529
 530 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
 531 {
 532         const struct macvlan_dev *vlan = netdev_priv(dev);
 533         const struct macvlan_port *port = vlan->port;
 534         const struct macvlan_dev *dest;
 535
 536         if (vlan->mode == MACVLAN_MODE_BRIDGE) {
 537                 const struct ethhdr *eth = skb_eth_hdr(skb);
 538
 539                 /* send to other bridge ports directly */
 540                 if (is_multicast_ether_addr(eth->h_dest)) {
 541                         skb_reset_mac_header(skb);
 542                         macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
 543                         goto xmit_world;
 544                 }
 545
 546                 dest = macvlan_hash_lookup(port, eth->h_dest);
 547                 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
 548                         /* send to lowerdev first for its network taps */
 549                         dev_forward_skb(vlan->lowerdev, skb);
 550
 551                         return NET_XMIT_SUCCESS;
 552                 }
 553         }
 554 xmit_world:
 555         skb->dev = vlan->lowerdev;
 556         return dev_queue_xmit_accel(skb,
 557                                     netdev_get_sb_channel(dev) ? dev : NULL);
 558 }
 559
 560 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
 561 {
 562 #ifdef CONFIG_NET_POLL_CONTROLLER
 563         return netpoll_send_skb(vlan->netpoll, skb);
 564 #else
 565         BUG();
 566         return NETDEV_TX_OK;
 567 #endif
 568 }
 569
 570 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
 571                                       struct net_device *dev)
 572 {
 573         struct macvlan_dev *vlan = netdev_priv(dev);
 574         unsigned int len = skb->len;
 575         int ret;
 576
 577         if (unlikely(netpoll_tx_running(dev)))
 578                 return macvlan_netpoll_send_skb(vlan, skb);
 579
 580         ret = macvlan_queue_xmit(skb, dev);
 581
 582         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 583                 struct vlan_pcpu_stats *pcpu_stats;
 584
 585                 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
 586                 u64_stats_update_begin(&pcpu_stats->syncp);
 587                 u64_stats_inc(&pcpu_stats->tx_packets);
 588                 u64_stats_add(&pcpu_stats->tx_bytes, len);
 589                 u64_stats_update_end(&pcpu_stats->syncp);
 590         } else {
 591                 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
 592         }
 593         return ret;
 594 }
 595
 596 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
 597                                unsigned short type, const void *daddr,
 598                                const void *saddr, unsigned len)
 599 {
 600         const struct macvlan_dev *vlan = netdev_priv(dev);
 601         struct net_device *lowerdev = vlan->lowerdev;
 602
 603         return dev_hard_header(skb, lowerdev, type, daddr,
 604                                saddr ? : dev->dev_addr, len);
 605 }
 606
 607 static const struct header_ops macvlan_hard_header_ops = {
 608         .create         = macvlan_hard_header,
 609         .parse          = eth_header_parse,
 610         .cache          = eth_header_cache,
 611         .cache_update   = eth_header_cache_update,
 612 };
 613
 614 static int macvlan_open(struct net_device *dev)
 615 {
 616         struct macvlan_dev *vlan = netdev_priv(dev);
 617         struct net_device *lowerdev = vlan->lowerdev;
 618         int err;
 619
 620         if (macvlan_passthru(vlan->port)) {
 621                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
 622                         err = dev_set_promiscuity(lowerdev, 1);
 623                         if (err < 0)
 624                                 goto out;
 625                 }
 626                 goto hash_add;
 627         }
 628
 629         err = -EADDRINUSE;
 630         if (macvlan_addr_busy(vlan->port, dev->dev_addr))
 631                 goto out;
 632
 633         /* Attempt to populate accel_priv which is used to offload the L2
 634          * forwarding requests for unicast packets.
 635          */
 636         if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD)
 637                 vlan->accel_priv =
 638                       lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
 639
 640         /* If earlier attempt to offload failed, or accel_priv is not
 641          * populated we must add the unicast address to the lower device.
 642          */
 643         if (IS_ERR_OR_NULL(vlan->accel_priv)) {
 644                 vlan->accel_priv = NULL;
 645                 err = dev_uc_add(lowerdev, dev->dev_addr);
 646                 if (err < 0)
 647                         goto out;
 648         }
 649
 650         if (dev->flags & IFF_ALLMULTI) {
 651                 err = dev_set_allmulti(lowerdev, 1);
 652                 if (err < 0)
 653                         goto del_unicast;
 654         }
 655
 656         if (dev->flags & IFF_PROMISC) {
 657                 err = dev_set_promiscuity(lowerdev, 1);
 658                 if (err < 0)
 659                         goto clear_multi;
 660         }
 661
 662 hash_add:
 663         macvlan_hash_add(vlan);
 664         return 0;
 665
 666 clear_multi:
 667         if (dev->flags & IFF_ALLMULTI)
 668                 dev_set_allmulti(lowerdev, -1);
 669 del_unicast:
 670         if (vlan->accel_priv) {
 671                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
 672                                                            vlan->accel_priv);
 673                 vlan->accel_priv = NULL;
 674         } else {
 675                 dev_uc_del(lowerdev, dev->dev_addr);
 676         }
 677 out:
 678         return err;
 679 }
 680
 681 static int macvlan_stop(struct net_device *dev)
 682 {
 683         struct macvlan_dev *vlan = netdev_priv(dev);
 684         struct net_device *lowerdev = vlan->lowerdev;
 685
 686         if (vlan->accel_priv) {
 687                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
 688                                                            vlan->accel_priv);
 689                 vlan->accel_priv = NULL;
 690         }
 691
 692         dev_uc_unsync(lowerdev, dev);
 693         dev_mc_unsync(lowerdev, dev);
 694
 695         if (macvlan_passthru(vlan->port)) {
 696                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
 697                         dev_set_promiscuity(lowerdev, -1);
 698                 goto hash_del;
 699         }
 700
 701         if (dev->flags & IFF_ALLMULTI)
 702                 dev_set_allmulti(lowerdev, -1);
 703
 704         if (dev->flags & IFF_PROMISC)
 705                 dev_set_promiscuity(lowerdev, -1);
 706
 707         dev_uc_del(lowerdev, dev->dev_addr);
 708
 709 hash_del:
 710         macvlan_hash_del(vlan, !dev->dismantle);
 711         return 0;
 712 }
 713
 714 static int macvlan_sync_address(struct net_device *dev,
 715                                 const unsigned char *addr)
 716 {
 717         struct macvlan_dev *vlan = netdev_priv(dev);
 718         struct net_device *lowerdev = vlan->lowerdev;
 719         struct macvlan_port *port = vlan->port;
 720         int err;
 721
 722         if (!(dev->flags & IFF_UP)) {
 723                 /* Just copy in the new address */
 724                 eth_hw_addr_set(dev, addr);
 725         } else {
 726                 /* Rehash and update the device filters */
 727                 if (macvlan_addr_busy(vlan->port, addr))
 728                         return -EADDRINUSE;
 729
 730                 if (!macvlan_passthru(port)) {
 731                         err = dev_uc_add(lowerdev, addr);
 732                         if (err)
 733                                 return err;
 734
 735                         dev_uc_del(lowerdev, dev->dev_addr);
 736                 }
 737
 738                 macvlan_hash_change_addr(vlan, addr);
 739         }
 740         if (macvlan_passthru(port) && !macvlan_addr_change(port)) {
 741                 /* Since addr_change isn't set, we are here due to lower
 742                  * device change.  Save the lower-dev address so we can
 743                  * restore it later.
 744                  */
 745                 ether_addr_copy(vlan->port->perm_addr,
 746                                 lowerdev->dev_addr);
 747         }
 748         macvlan_clear_addr_change(port);
 749         return 0;
 750 }
 751
 752 static int macvlan_set_mac_address(struct net_device *dev, void *p)
 753 {
 754         struct macvlan_dev *vlan = netdev_priv(dev);
 755         struct sockaddr *addr = p;
 756
 757         if (!is_valid_ether_addr(addr->sa_data))
 758                 return -EADDRNOTAVAIL;
 759
 760         /* If the addresses are the same, this is a no-op */
 761         if (ether_addr_equal(dev->dev_addr, addr->sa_data))
 762                 return 0;
 763
 764         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
 765                 macvlan_set_addr_change(vlan->port);
 766                 return dev_set_mac_address(vlan->lowerdev, addr, NULL);
 767         }
 768
 769         if (macvlan_addr_busy(vlan->port, addr->sa_data))
 770                 return -EADDRINUSE;
 771
 772         return macvlan_sync_address(dev, addr->sa_data);
 773 }
 774
 775 static void macvlan_change_rx_flags(struct net_device *dev, int change)
 776 {
 777         struct macvlan_dev *vlan = netdev_priv(dev);
 778         struct net_device *lowerdev = vlan->lowerdev;
 779
 780         if (dev->flags & IFF_UP) {
 781                 if (change & IFF_ALLMULTI)
 782                         dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 783                 if (change & IFF_PROMISC)
 784                         dev_set_promiscuity(lowerdev,
 785                                             dev->flags & IFF_PROMISC ? 1 : -1);
 786
 787         }
 788 }
 789
 790 static void macvlan_compute_filter(unsigned long *mc_filter,
 791                                    struct net_device *dev,
 792                                    struct macvlan_dev *vlan, int cutoff)
 793 {
 794         if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
 795                 bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ);
 796         } else {
 797                 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
 798                 struct netdev_hw_addr *ha;
 799
 800                 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
 801                 netdev_for_each_mc_addr(ha, dev) {
 802                         if (!vlan && ha->synced <= cutoff)
 803                                 continue;
 804
 805                         __set_bit(mc_hash(vlan, ha->addr), filter);
 806                 }
 807
 808                 __set_bit(mc_hash(vlan, dev->broadcast), filter);
 809
 810                 bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ);
 811         }
 812 }
 813
 814 static void macvlan_recompute_bc_filter(struct macvlan_dev *vlan)
 815 {
 816         if (vlan->port->bc_cutoff < 0) {
 817                 bitmap_zero(vlan->port->bc_filter, MACVLAN_MC_FILTER_SZ);
 818                 return;
 819         }
 820
 821         macvlan_compute_filter(vlan->port->bc_filter, vlan->lowerdev, NULL,
 822                                vlan->port->bc_cutoff);
 823 }
 824
 825 static void macvlan_set_mac_lists(struct net_device *dev)
 826 {
 827         struct macvlan_dev *vlan = netdev_priv(dev);
 828
 829         macvlan_compute_filter(vlan->mc_filter, dev, vlan, 0);
 830
 831         dev_uc_sync(vlan->lowerdev, dev);
 832         dev_mc_sync(vlan->lowerdev, dev);
 833
 834         /* This is slightly inaccurate as we're including the subscription
 835          * list of vlan->lowerdev too.
 836          *
 837          * Bug alert: This only works if everyone has the same broadcast
 838          * address as lowerdev.  As soon as someone changes theirs this
 839          * will break.
 840          *
 841          * However, this is already broken as when you change your broadcast
 842          * address we don't get called.
 843          *
 844          * The solution is to maintain a list of broadcast addresses like
 845          * we do for uc/mc, if you care.
 846          */
 847         macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL,
 848                                0);
 849         macvlan_recompute_bc_filter(vlan);
 850 }
 851
 852 static void update_port_bc_cutoff(struct macvlan_dev *vlan, int cutoff)
 853 {
 854         if (vlan->port->bc_cutoff == cutoff)
 855                 return;
 856
 857         vlan->port->bc_cutoff = cutoff;
 858         macvlan_recompute_bc_filter(vlan);
 859 }
 860
 861 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
 862 {
 863         struct macvlan_dev *vlan = netdev_priv(dev);
 864
 865         if (vlan->lowerdev->mtu < new_mtu)
 866                 return -EINVAL;
 867         dev->mtu = new_mtu;
 868         return 0;
 869 }
 870
 871 static int macvlan_hwtstamp_get(struct net_device *dev,
 872                                 struct kernel_hwtstamp_config *cfg)
 873 {
 874         struct net_device *real_dev = macvlan_dev_real_dev(dev);
 875
 876         return generic_hwtstamp_get_lower(real_dev, cfg);
 877 }
 878
 879 static int macvlan_hwtstamp_set(struct net_device *dev,
 880                                 struct kernel_hwtstamp_config *cfg,
 881                                 struct netlink_ext_ack *extack)
 882 {
 883         struct net_device *real_dev = macvlan_dev_real_dev(dev);
 884
 885         if (!net_eq(dev_net(dev), &init_net))
 886                 return -EOPNOTSUPP;
 887
 888         return generic_hwtstamp_set_lower(real_dev, cfg, extack);
 889 }
 890
 891 /*
 892  * macvlan network devices have devices nesting below it and are a special
 893  * "super class" of normal network devices; split their locks off into a
 894  * separate class since they always nest.
 895  */
 896 static struct lock_class_key macvlan_netdev_addr_lock_key;
 897
 898 #define ALWAYS_ON_OFFLOADS \
 899         (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | \
 900          NETIF_F_GSO_ROBUST | NETIF_F_GSO_ENCAP_ALL)
 901
 902 #define ALWAYS_ON_FEATURES (ALWAYS_ON_OFFLOADS | NETIF_F_LLTX)
 903
 904 #define MACVLAN_FEATURES \
 905         (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
 906          NETIF_F_GSO | NETIF_F_TSO | NETIF_F_LRO | \
 907          NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
 908          NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
 909
 910 #define MACVLAN_STATE_MASK \
 911         ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
 912
 913 static void macvlan_set_lockdep_class(struct net_device *dev)
 914 {
 915         netdev_lockdep_set_classes(dev);
 916         lockdep_set_class(&dev->addr_list_lock,
 917                           &macvlan_netdev_addr_lock_key);
 918 }
 919
 920 static int macvlan_init(struct net_device *dev)
 921 {
 922         struct macvlan_dev *vlan = netdev_priv(dev);
 923         struct net_device *lowerdev = vlan->lowerdev;
 924         struct macvlan_port *port = vlan->port;
 925
 926         dev->state              = (dev->state & ~MACVLAN_STATE_MASK) |
 927                                   (lowerdev->state & MACVLAN_STATE_MASK);
 928         dev->features           = lowerdev->features & MACVLAN_FEATURES;
 929         dev->features           |= ALWAYS_ON_FEATURES;
 930         dev->hw_features        |= NETIF_F_LRO;
 931         dev->vlan_features      = lowerdev->vlan_features & MACVLAN_FEATURES;
 932         dev->vlan_features      |= ALWAYS_ON_OFFLOADS;
 933         dev->hw_enc_features    |= dev->features;
 934         netif_inherit_tso_max(dev, lowerdev);
 935         dev->hard_header_len    = lowerdev->hard_header_len;
 936         macvlan_set_lockdep_class(dev);
 937
 938         vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
 939         if (!vlan->pcpu_stats)
 940                 return -ENOMEM;
 941
 942         port->count += 1;
 943
 944         /* Get macvlan's reference to lowerdev */
 945         netdev_hold(lowerdev, &vlan->dev_tracker, GFP_KERNEL);
 946
 947         return 0;
 948 }
 949
 950 static void macvlan_uninit(struct net_device *dev)
 951 {
 952         struct macvlan_dev *vlan = netdev_priv(dev);
 953         struct macvlan_port *port = vlan->port;
 954
 955         free_percpu(vlan->pcpu_stats);
 956
 957         macvlan_flush_sources(port, vlan);
 958         port->count -= 1;
 959         if (!port->count)
 960                 macvlan_port_destroy(port->dev);
 961 }
 962
 963 static void macvlan_dev_get_stats64(struct net_device *dev,
 964                                     struct rtnl_link_stats64 *stats)
 965 {
 966         struct macvlan_dev *vlan = netdev_priv(dev);
 967
 968         if (vlan->pcpu_stats) {
 969                 struct vlan_pcpu_stats *p;
 970                 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
 971                 u32 rx_errors = 0, tx_dropped = 0;
 972                 unsigned int start;
 973                 int i;
 974
 975                 for_each_possible_cpu(i) {
 976                         p = per_cpu_ptr(vlan->pcpu_stats, i);
 977                         do {
 978                                 start = u64_stats_fetch_begin(&p->syncp);
 979                                 rx_packets      = u64_stats_read(&p->rx_packets);
 980                                 rx_bytes        = u64_stats_read(&p->rx_bytes);
 981                                 rx_multicast    = u64_stats_read(&p->rx_multicast);
 982                                 tx_packets      = u64_stats_read(&p->tx_packets);
 983                                 tx_bytes        = u64_stats_read(&p->tx_bytes);
 984                         } while (u64_stats_fetch_retry(&p->syncp, start));
 985
 986                         stats->rx_packets       += rx_packets;
 987                         stats->rx_bytes         += rx_bytes;
 988                         stats->multicast        += rx_multicast;
 989                         stats->tx_packets       += tx_packets;
 990                         stats->tx_bytes         += tx_bytes;
 991                         /* rx_errors & tx_dropped are u32, updated
 992                          * without syncp protection.
 993                          */
 994                         rx_errors       += READ_ONCE(p->rx_errors);
 995                         tx_dropped      += READ_ONCE(p->tx_dropped);
 996                 }
 997                 stats->rx_errors        = rx_errors;
 998                 stats->rx_dropped       = rx_errors;
 999                 stats->tx_dropped       = tx_dropped;
1000         }
1001 }
1002
1003 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
1004                                    __be16 proto, u16 vid)
1005 {
1006         struct macvlan_dev *vlan = netdev_priv(dev);
1007         struct net_device *lowerdev = vlan->lowerdev;
1008
1009         return vlan_vid_add(lowerdev, proto, vid);
1010 }
1011
1012 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
1013                                     __be16 proto, u16 vid)
1014 {
1015         struct macvlan_dev *vlan = netdev_priv(dev);
1016         struct net_device *lowerdev = vlan->lowerdev;
1017
1018         vlan_vid_del(lowerdev, proto, vid);
1019         return 0;
1020 }
1021
1022 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
1023                            struct net_device *dev,
1024                            const unsigned char *addr, u16 vid,
1025                            u16 flags,
1026                            struct netlink_ext_ack *extack)
1027 {
1028         struct macvlan_dev *vlan = netdev_priv(dev);
1029         int err = -EINVAL;
1030
1031         /* Support unicast filter only on passthru devices.
1032          * Multicast filter should be allowed on all devices.
1033          */
1034         if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
1035                 return -EOPNOTSUPP;
1036
1037         if (flags & NLM_F_REPLACE)
1038                 return -EOPNOTSUPP;
1039
1040         if (is_unicast_ether_addr(addr))
1041                 err = dev_uc_add_excl(dev, addr);
1042         else if (is_multicast_ether_addr(addr))
1043                 err = dev_mc_add_excl(dev, addr);
1044
1045         return err;
1046 }
1047
1048 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
1049                            struct net_device *dev,
1050                            const unsigned char *addr, u16 vid,
1051                            struct netlink_ext_ack *extack)
1052 {
1053         struct macvlan_dev *vlan = netdev_priv(dev);
1054         int err = -EINVAL;
1055
1056         /* Support unicast filter only on passthru devices.
1057          * Multicast filter should be allowed on all devices.
1058          */
1059         if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
1060                 return -EOPNOTSUPP;
1061
1062         if (is_unicast_ether_addr(addr))
1063                 err = dev_uc_del(dev, addr);
1064         else if (is_multicast_ether_addr(addr))
1065                 err = dev_mc_del(dev, addr);
1066
1067         return err;
1068 }
1069
1070 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
1071                                         struct ethtool_drvinfo *drvinfo)
1072 {
1073         strscpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
1074         strscpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
1075 }
1076
1077 static int macvlan_ethtool_get_link_ksettings(struct net_device *dev,
1078                                               struct ethtool_link_ksettings *cmd)
1079 {
1080         const struct macvlan_dev *vlan = netdev_priv(dev);
1081
1082         return __ethtool_get_link_ksettings(vlan->lowerdev, cmd);
1083 }
1084
1085 static int macvlan_ethtool_get_ts_info(struct net_device *dev,
1086                                        struct ethtool_ts_info *info)
1087 {
1088         struct net_device *real_dev = macvlan_dev_real_dev(dev);
1089         const struct ethtool_ops *ops = real_dev->ethtool_ops;
1090         struct phy_device *phydev = real_dev->phydev;
1091
1092         if (phy_has_tsinfo(phydev)) {
1093                 return phy_ts_info(phydev, info);
1094         } else if (ops->get_ts_info) {
1095                 return ops->get_ts_info(real_dev, info);
1096         } else {
1097                 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
1098                         SOF_TIMESTAMPING_SOFTWARE;
1099                 info->phc_index = -1;
1100         }
1101
1102         return 0;
1103 }
1104
1105 static netdev_features_t macvlan_fix_features(struct net_device *dev,
1106                                               netdev_features_t features)
1107 {
1108         struct macvlan_dev *vlan = netdev_priv(dev);
1109         netdev_features_t lowerdev_features = vlan->lowerdev->features;
1110         netdev_features_t mask;
1111
1112         features |= NETIF_F_ALL_FOR_ALL;
1113         features &= (vlan->set_features | ~MACVLAN_FEATURES);
1114         mask = features;
1115
1116         lowerdev_features &= (features | ~NETIF_F_LRO);
1117         features = netdev_increment_features(lowerdev_features, features, mask);
1118         features |= ALWAYS_ON_FEATURES;
1119         features &= (ALWAYS_ON_FEATURES | MACVLAN_FEATURES);
1120
1121         return features;
1122 }
1123
1124 #ifdef CONFIG_NET_POLL_CONTROLLER
1125 static void macvlan_dev_poll_controller(struct net_device *dev)
1126 {
1127         return;
1128 }
1129
1130 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
1131 {
1132         struct macvlan_dev *vlan = netdev_priv(dev);
1133         struct net_device *real_dev = vlan->lowerdev;
1134         struct netpoll *netpoll;
1135         int err;
1136
1137         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
1138         err = -ENOMEM;
1139         if (!netpoll)
1140                 goto out;
1141
1142         err = __netpoll_setup(netpoll, real_dev);
1143         if (err) {
1144                 kfree(netpoll);
1145                 goto out;
1146         }
1147
1148         vlan->netpoll = netpoll;
1149
1150 out:
1151         return err;
1152 }
1153
1154 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
1155 {
1156         struct macvlan_dev *vlan = netdev_priv(dev);
1157         struct netpoll *netpoll = vlan->netpoll;
1158
1159         if (!netpoll)
1160                 return;
1161
1162         vlan->netpoll = NULL;
1163
1164         __netpoll_free(netpoll);
1165 }
1166 #endif  /* CONFIG_NET_POLL_CONTROLLER */
1167
1168 static int macvlan_dev_get_iflink(const struct net_device *dev)
1169 {
1170         struct macvlan_dev *vlan = netdev_priv(dev);
1171
1172         return vlan->lowerdev->ifindex;
1173 }
1174
1175 static const struct ethtool_ops macvlan_ethtool_ops = {
1176         .get_link               = ethtool_op_get_link,
1177         .get_link_ksettings     = macvlan_ethtool_get_link_ksettings,
1178         .get_drvinfo            = macvlan_ethtool_get_drvinfo,
1179         .get_ts_info            = macvlan_ethtool_get_ts_info,
1180 };
1181
1182 static const struct net_device_ops macvlan_netdev_ops = {
1183         .ndo_init               = macvlan_init,
1184         .ndo_uninit             = macvlan_uninit,
1185         .ndo_open               = macvlan_open,
1186         .ndo_stop               = macvlan_stop,
1187         .ndo_start_xmit         = macvlan_start_xmit,
1188         .ndo_change_mtu         = macvlan_change_mtu,
1189         .ndo_fix_features       = macvlan_fix_features,
1190         .ndo_change_rx_flags    = macvlan_change_rx_flags,
1191         .ndo_set_mac_address    = macvlan_set_mac_address,
1192         .ndo_set_rx_mode        = macvlan_set_mac_lists,
1193         .ndo_get_stats64        = macvlan_dev_get_stats64,
1194         .ndo_validate_addr      = eth_validate_addr,
1195         .ndo_vlan_rx_add_vid    = macvlan_vlan_rx_add_vid,
1196         .ndo_vlan_rx_kill_vid   = macvlan_vlan_rx_kill_vid,
1197         .ndo_fdb_add            = macvlan_fdb_add,
1198         .ndo_fdb_del            = macvlan_fdb_del,
1199         .ndo_fdb_dump           = ndo_dflt_fdb_dump,
1200 #ifdef CONFIG_NET_POLL_CONTROLLER
1201         .ndo_poll_controller    = macvlan_dev_poll_controller,
1202         .ndo_netpoll_setup      = macvlan_dev_netpoll_setup,
1203         .ndo_netpoll_cleanup    = macvlan_dev_netpoll_cleanup,
1204 #endif
1205         .ndo_get_iflink         = macvlan_dev_get_iflink,
1206         .ndo_features_check     = passthru_features_check,
1207         .ndo_hwtstamp_get       = macvlan_hwtstamp_get,
1208         .ndo_hwtstamp_set       = macvlan_hwtstamp_set,
1209 };
1210
1211 static void macvlan_dev_free(struct net_device *dev)
1212 {
1213         struct macvlan_dev *vlan = netdev_priv(dev);
1214
1215         /* Get rid of the macvlan's reference to lowerdev */
1216         netdev_put(vlan->lowerdev, &vlan->dev_tracker);
1217 }
1218
1219 void macvlan_common_setup(struct net_device *dev)
1220 {
1221         ether_setup(dev);
1222
1223         /* ether_setup() has set dev->min_mtu to ETH_MIN_MTU. */
1224         dev->max_mtu            = ETH_MAX_MTU;
1225         dev->priv_flags        &= ~IFF_TX_SKB_SHARING;
1226         netif_keep_dst(dev);
1227         dev->priv_flags        |= IFF_UNICAST_FLT | IFF_CHANGE_PROTO_DOWN;
1228         dev->netdev_ops         = &macvlan_netdev_ops;
1229         dev->needs_free_netdev  = true;
1230         dev->priv_destructor    = macvlan_dev_free;
1231         dev->header_ops         = &macvlan_hard_header_ops;
1232         dev->ethtool_ops        = &macvlan_ethtool_ops;
1233 }
1234 EXPORT_SYMBOL_GPL(macvlan_common_setup);
1235
1236 static void macvlan_setup(struct net_device *dev)
1237 {
1238         macvlan_common_setup(dev);
1239         dev->priv_flags |= IFF_NO_QUEUE;
1240 }
1241
1242 static int macvlan_port_create(struct net_device *dev)
1243 {
1244         struct macvlan_port *port;
1245         unsigned int i;
1246         int err;
1247
1248         if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1249                 return -EINVAL;
1250
1251         if (netdev_is_rx_handler_busy(dev))
1252                 return -EBUSY;
1253
1254         port = kzalloc(sizeof(*port), GFP_KERNEL);
1255         if (port == NULL)
1256                 return -ENOMEM;
1257
1258         port->dev = dev;
1259         ether_addr_copy(port->perm_addr, dev->dev_addr);
1260         INIT_LIST_HEAD(&port->vlans);
1261         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1262                 INIT_HLIST_HEAD(&port->vlan_hash[i]);
1263         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1264                 INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1265
1266         port->bc_queue_len_used = 0;
1267         port->bc_cutoff = 1;
1268         skb_queue_head_init(&port->bc_queue);
1269         INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1270
1271         err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1272         if (err)
1273                 kfree(port);
1274         else
1275                 dev->priv_flags |= IFF_MACVLAN_PORT;
1276         return err;
1277 }
1278
1279 static void macvlan_port_destroy(struct net_device *dev)
1280 {
1281         struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1282         struct sk_buff *skb;
1283
1284         dev->priv_flags &= ~IFF_MACVLAN_PORT;
1285         netdev_rx_handler_unregister(dev);
1286
1287         /* After this point, no packet can schedule bc_work anymore,
1288          * but we need to cancel it and purge left skbs if any.
1289          */
1290         cancel_work_sync(&port->bc_work);
1291
1292         while ((skb = __skb_dequeue(&port->bc_queue))) {
1293                 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
1294
1295                 if (src)
1296                         dev_put(src->dev);
1297
1298                 kfree_skb(skb);
1299         }
1300
1301         /* If the lower device address has been changed by passthru
1302          * macvlan, put it back.
1303          */
1304         if (macvlan_passthru(port) &&
1305             !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) {
1306                 struct sockaddr sa;
1307
1308                 sa.sa_family = port->dev->type;
1309                 memcpy(&sa.sa_data, port->perm_addr, port->dev->addr_len);
1310                 dev_set_mac_address(port->dev, &sa, NULL);
1311         }
1312
1313         kfree(port);
1314 }
1315
1316 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[],
1317                             struct netlink_ext_ack *extack)
1318 {
1319         struct nlattr *nla, *head;
1320         int rem, len;
1321
1322         if (tb[IFLA_ADDRESS]) {
1323                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1324                         return -EINVAL;
1325                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1326                         return -EADDRNOTAVAIL;
1327         }
1328
1329         if (!data)
1330                 return 0;
1331
1332         if (data[IFLA_MACVLAN_FLAGS] &&
1333             nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~(MACVLAN_FLAG_NOPROMISC |
1334                                                       MACVLAN_FLAG_NODST))
1335                 return -EINVAL;
1336
1337         if (data[IFLA_MACVLAN_MODE]) {
1338                 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1339                 case MACVLAN_MODE_PRIVATE:
1340                 case MACVLAN_MODE_VEPA:
1341                 case MACVLAN_MODE_BRIDGE:
1342                 case MACVLAN_MODE_PASSTHRU:
1343                 case MACVLAN_MODE_SOURCE:
1344                         break;
1345                 default:
1346                         return -EINVAL;
1347                 }
1348         }
1349
1350         if (data[IFLA_MACVLAN_MACADDR_MODE]) {
1351                 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1352                 case MACVLAN_MACADDR_ADD:
1353                 case MACVLAN_MACADDR_DEL:
1354                 case MACVLAN_MACADDR_FLUSH:
1355                 case MACVLAN_MACADDR_SET:
1356                         break;
1357                 default:
1358                         return -EINVAL;
1359                 }
1360         }
1361
1362         if (data[IFLA_MACVLAN_MACADDR]) {
1363                 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1364                         return -EINVAL;
1365
1366                 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1367                         return -EADDRNOTAVAIL;
1368         }
1369
1370         if (data[IFLA_MACVLAN_MACADDR_DATA]) {
1371                 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1372                 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1373
1374                 nla_for_each_attr(nla, head, len, rem) {
1375                         if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1376                             nla_len(nla) != ETH_ALEN)
1377                                 return -EINVAL;
1378
1379                         if (!is_valid_ether_addr(nla_data(nla)))
1380                                 return -EADDRNOTAVAIL;
1381                 }
1382         }
1383
1384         if (data[IFLA_MACVLAN_MACADDR_COUNT])
1385                 return -EINVAL;
1386
1387         return 0;
1388 }
1389
1390 /*
1391  * reconfigure list of remote source mac address
1392  * (only for macvlan devices in source mode)
1393  * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1394  * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1395  */
1396 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1397                                       struct nlattr *data[])
1398 {
1399         char *addr = NULL;
1400         int ret, rem, len;
1401         struct nlattr *nla, *head;
1402         struct macvlan_source_entry *entry;
1403
1404         if (data[IFLA_MACVLAN_MACADDR])
1405                 addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1406
1407         if (mode == MACVLAN_MACADDR_ADD) {
1408                 if (!addr)
1409                         return -EINVAL;
1410
1411                 return macvlan_hash_add_source(vlan, addr);
1412
1413         } else if (mode == MACVLAN_MACADDR_DEL) {
1414                 if (!addr)
1415                         return -EINVAL;
1416
1417                 entry = macvlan_hash_lookup_source(vlan, addr);
1418                 if (entry) {
1419                         macvlan_hash_del_source(entry);
1420                         vlan->macaddr_count--;
1421                 }
1422         } else if (mode == MACVLAN_MACADDR_FLUSH) {
1423                 macvlan_flush_sources(vlan->port, vlan);
1424         } else if (mode == MACVLAN_MACADDR_SET) {
1425                 macvlan_flush_sources(vlan->port, vlan);
1426
1427                 if (addr) {
1428                         ret = macvlan_hash_add_source(vlan, addr);
1429                         if (ret)
1430                                 return ret;
1431                 }
1432
1433                 if (!data[IFLA_MACVLAN_MACADDR_DATA])
1434                         return 0;
1435
1436                 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1437                 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1438
1439                 nla_for_each_attr(nla, head, len, rem) {
1440                         addr = nla_data(nla);
1441                         ret = macvlan_hash_add_source(vlan, addr);
1442                         if (ret)
1443                                 return ret;
1444                 }
1445         } else {
1446                 return -EINVAL;
1447         }
1448
1449         return 0;
1450 }
1451
1452 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1453                            struct nlattr *tb[], struct nlattr *data[],
1454                            struct netlink_ext_ack *extack)
1455 {
1456         struct macvlan_dev *vlan = netdev_priv(dev);
1457         struct macvlan_port *port;
1458         struct net_device *lowerdev;
1459         int err;
1460         int macmode;
1461         bool create = false;
1462
1463         if (!tb[IFLA_LINK])
1464                 return -EINVAL;
1465
1466         lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1467         if (lowerdev == NULL)
1468                 return -ENODEV;
1469
1470         /* When creating macvlans or macvtaps on top of other macvlans - use
1471          * the real device as the lowerdev.
1472          */
1473         if (netif_is_macvlan(lowerdev))
1474                 lowerdev = macvlan_dev_real_dev(lowerdev);
1475
1476         if (!tb[IFLA_MTU])
1477                 dev->mtu = lowerdev->mtu;
1478         else if (dev->mtu > lowerdev->mtu)
1479                 return -EINVAL;
1480
1481         /* MTU range: 68 - lowerdev->max_mtu */
1482         dev->min_mtu = ETH_MIN_MTU;
1483         dev->max_mtu = lowerdev->max_mtu;
1484
1485         if (!tb[IFLA_ADDRESS])
1486                 eth_hw_addr_random(dev);
1487
1488         if (!netif_is_macvlan_port(lowerdev)) {
1489                 err = macvlan_port_create(lowerdev);
1490                 if (err < 0)
1491                         return err;
1492                 create = true;
1493         }
1494         port = macvlan_port_get_rtnl(lowerdev);
1495
1496         /* Only 1 macvlan device can be created in passthru mode */
1497         if (macvlan_passthru(port)) {
1498                 /* The macvlan port must be not created this time,
1499                  * still goto destroy_macvlan_port for readability.
1500                  */
1501                 err = -EINVAL;
1502                 goto destroy_macvlan_port;
1503         }
1504
1505         vlan->lowerdev = lowerdev;
1506         vlan->dev      = dev;
1507         vlan->port     = port;
1508         vlan->set_features = MACVLAN_FEATURES;
1509
1510         vlan->mode     = MACVLAN_MODE_VEPA;
1511         if (data && data[IFLA_MACVLAN_MODE])
1512                 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1513
1514         if (data && data[IFLA_MACVLAN_FLAGS])
1515                 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1516
1517         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1518                 if (port->count) {
1519                         err = -EINVAL;
1520                         goto destroy_macvlan_port;
1521                 }
1522                 macvlan_set_passthru(port);
1523                 eth_hw_addr_inherit(dev, lowerdev);
1524         }
1525
1526         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1527                 if (vlan->mode != MACVLAN_MODE_SOURCE) {
1528                         err = -EINVAL;
1529                         goto destroy_macvlan_port;
1530                 }
1531                 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1532                 err = macvlan_changelink_sources(vlan, macmode, data);
1533                 if (err)
1534                         goto destroy_macvlan_port;
1535         }
1536
1537         vlan->bc_queue_len_req = MACVLAN_DEFAULT_BC_QUEUE_LEN;
1538         if (data && data[IFLA_MACVLAN_BC_QUEUE_LEN])
1539                 vlan->bc_queue_len_req = nla_get_u32(data[IFLA_MACVLAN_BC_QUEUE_LEN]);
1540
1541         if (data && data[IFLA_MACVLAN_BC_CUTOFF])
1542                 update_port_bc_cutoff(
1543                         vlan, nla_get_s32(data[IFLA_MACVLAN_BC_CUTOFF]));
1544
1545         err = register_netdevice(dev);
1546         if (err < 0)
1547                 goto destroy_macvlan_port;
1548
1549         dev->priv_flags |= IFF_MACVLAN;
1550         err = netdev_upper_dev_link(lowerdev, dev, extack);
1551         if (err)
1552                 goto unregister_netdev;
1553
1554         list_add_tail_rcu(&vlan->list, &port->vlans);
1555         update_port_bc_queue_len(vlan->port);
1556         netif_stacked_transfer_operstate(lowerdev, dev);
1557         linkwatch_fire_event(dev);
1558
1559         return 0;
1560
1561 unregister_netdev:
1562         /* macvlan_uninit would free the macvlan port */
1563         unregister_netdevice(dev);
1564         return err;
1565 destroy_macvlan_port:
1566         /* the macvlan port may be freed by macvlan_uninit when fail to register.
1567          * so we destroy the macvlan port only when it's valid.
1568          */
1569         if (create && macvlan_port_get_rtnl(lowerdev)) {
1570                 macvlan_flush_sources(port, vlan);
1571                 macvlan_port_destroy(port->dev);
1572         }
1573         return err;
1574 }
1575 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1576
1577 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1578                            struct nlattr *tb[], struct nlattr *data[],
1579                            struct netlink_ext_ack *extack)
1580 {
1581         return macvlan_common_newlink(src_net, dev, tb, data, extack);
1582 }
1583
1584 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1585 {
1586         struct macvlan_dev *vlan = netdev_priv(dev);
1587
1588         if (vlan->mode == MACVLAN_MODE_SOURCE)
1589                 macvlan_flush_sources(vlan->port, vlan);
1590         list_del_rcu(&vlan->list);
1591         update_port_bc_queue_len(vlan->port);
1592         unregister_netdevice_queue(dev, head);
1593         netdev_upper_dev_unlink(vlan->lowerdev, dev);
1594 }
1595 EXPORT_SYMBOL_GPL(macvlan_dellink);
1596
1597 static int macvlan_changelink(struct net_device *dev,
1598                               struct nlattr *tb[], struct nlattr *data[],
1599                               struct netlink_ext_ack *extack)
1600 {
1601         struct macvlan_dev *vlan = netdev_priv(dev);
1602         enum macvlan_mode mode;
1603         bool set_mode = false;
1604         enum macvlan_macaddr_mode macmode;
1605         int ret;
1606
1607         /* Validate mode, but don't set yet: setting flags may fail. */
1608         if (data && data[IFLA_MACVLAN_MODE]) {
1609                 set_mode = true;
1610                 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1611                 /* Passthrough mode can't be set or cleared dynamically */
1612                 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1613                     (vlan->mode == MACVLAN_MODE_PASSTHRU))
1614                         return -EINVAL;
1615                 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1616                     vlan->mode != mode)
1617                         macvlan_flush_sources(vlan->port, vlan);
1618         }
1619
1620         if (data && data[IFLA_MACVLAN_FLAGS]) {
1621                 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1622                 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1623                 if (macvlan_passthru(vlan->port) && promisc) {
1624                         int err;
1625
1626                         if (flags & MACVLAN_FLAG_NOPROMISC)
1627                                 err = dev_set_promiscuity(vlan->lowerdev, -1);
1628                         else
1629                                 err = dev_set_promiscuity(vlan->lowerdev, 1);
1630                         if (err < 0)
1631                                 return err;
1632                 }
1633                 vlan->flags = flags;
1634         }
1635
1636         if (data && data[IFLA_MACVLAN_BC_QUEUE_LEN]) {
1637                 vlan->bc_queue_len_req = nla_get_u32(data[IFLA_MACVLAN_BC_QUEUE_LEN]);
1638                 update_port_bc_queue_len(vlan->port);
1639         }
1640
1641         if (data && data[IFLA_MACVLAN_BC_CUTOFF])
1642                 update_port_bc_cutoff(
1643                         vlan, nla_get_s32(data[IFLA_MACVLAN_BC_CUTOFF]));
1644
1645         if (set_mode)
1646                 vlan->mode = mode;
1647         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1648                 if (vlan->mode != MACVLAN_MODE_SOURCE)
1649                         return -EINVAL;
1650                 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1651                 ret = macvlan_changelink_sources(vlan, macmode, data);
1652                 if (ret)
1653                         return ret;
1654         }
1655         return 0;
1656 }
1657
1658 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1659 {
1660         if (vlan->macaddr_count == 0)
1661                 return 0;
1662         return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1663                 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1664 }
1665
1666 static size_t macvlan_get_size(const struct net_device *dev)
1667 {
1668         struct macvlan_dev *vlan = netdev_priv(dev);
1669
1670         return (0
1671                 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1672                 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1673                 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1674                 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1675                 + nla_total_size(4) /* IFLA_MACVLAN_BC_QUEUE_LEN */
1676                 + nla_total_size(4) /* IFLA_MACVLAN_BC_QUEUE_LEN_USED */
1677                 );
1678 }
1679
1680 static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1681                                      const struct macvlan_dev *vlan,
1682                                      const int i)
1683 {
1684         struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1685         struct macvlan_source_entry *entry;
1686
1687         hlist_for_each_entry_rcu(entry, h, hlist, lockdep_rtnl_is_held()) {
1688                 if (entry->vlan != vlan)
1689                         continue;
1690                 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1691                         return 1;
1692         }
1693         return 0;
1694 }
1695
1696 static int macvlan_fill_info(struct sk_buff *skb,
1697                                 const struct net_device *dev)
1698 {
1699         struct macvlan_dev *vlan = netdev_priv(dev);
1700         struct macvlan_port *port = vlan->port;
1701         int i;
1702         struct nlattr *nest;
1703
1704         if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1705                 goto nla_put_failure;
1706         if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1707                 goto nla_put_failure;
1708         if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1709                 goto nla_put_failure;
1710         if (vlan->macaddr_count > 0) {
1711                 nest = nla_nest_start_noflag(skb, IFLA_MACVLAN_MACADDR_DATA);
1712                 if (nest == NULL)
1713                         goto nla_put_failure;
1714
1715                 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1716                         if (macvlan_fill_info_macaddr(skb, vlan, i))
1717                                 goto nla_put_failure;
1718                 }
1719                 nla_nest_end(skb, nest);
1720         }
1721         if (nla_put_u32(skb, IFLA_MACVLAN_BC_QUEUE_LEN, vlan->bc_queue_len_req))
1722                 goto nla_put_failure;
1723         if (nla_put_u32(skb, IFLA_MACVLAN_BC_QUEUE_LEN_USED, port->bc_queue_len_used))
1724                 goto nla_put_failure;
1725         if (port->bc_cutoff != 1 &&
1726             nla_put_s32(skb, IFLA_MACVLAN_BC_CUTOFF, port->bc_cutoff))
1727                 goto nla_put_failure;
1728         return 0;
1729
1730 nla_put_failure:
1731         return -EMSGSIZE;
1732 }
1733
1734 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1735         [IFLA_MACVLAN_MODE]  = { .type = NLA_U32 },
1736         [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1737         [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1738         [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1739         [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1740         [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1741         [IFLA_MACVLAN_BC_QUEUE_LEN] = { .type = NLA_U32 },
1742         [IFLA_MACVLAN_BC_QUEUE_LEN_USED] = { .type = NLA_REJECT },
1743         [IFLA_MACVLAN_BC_CUTOFF] = { .type = NLA_S32 },
1744 };
1745
1746 int macvlan_link_register(struct rtnl_link_ops *ops)
1747 {
1748         /* common fields */
1749         ops->validate           = macvlan_validate;
1750         ops->maxtype            = IFLA_MACVLAN_MAX;
1751         ops->policy             = macvlan_policy;
1752         ops->changelink         = macvlan_changelink;
1753         ops->get_size           = macvlan_get_size;
1754         ops->fill_info          = macvlan_fill_info;
1755
1756         return rtnl_link_register(ops);
1757 };
1758 EXPORT_SYMBOL_GPL(macvlan_link_register);
1759
1760 static struct net *macvlan_get_link_net(const struct net_device *dev)
1761 {
1762         return dev_net(macvlan_dev_real_dev(dev));
1763 }
1764
1765 static struct rtnl_link_ops macvlan_link_ops = {
1766         .kind           = "macvlan",
1767         .setup          = macvlan_setup,
1768         .newlink        = macvlan_newlink,
1769         .dellink        = macvlan_dellink,
1770         .get_link_net   = macvlan_get_link_net,
1771         .priv_size      = sizeof(struct macvlan_dev),
1772 };
1773
1774 static void update_port_bc_queue_len(struct macvlan_port *port)
1775 {
1776         u32 max_bc_queue_len_req = 0;
1777         struct macvlan_dev *vlan;
1778
1779         list_for_each_entry(vlan, &port->vlans, list) {
1780                 if (vlan->bc_queue_len_req > max_bc_queue_len_req)
1781                         max_bc_queue_len_req = vlan->bc_queue_len_req;
1782         }
1783         port->bc_queue_len_used = max_bc_queue_len_req;
1784 }
1785
1786 static int macvlan_device_event(struct notifier_block *unused,
1787                                 unsigned long event, void *ptr)
1788 {
1789         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1790         struct macvlan_dev *vlan, *next;
1791         struct macvlan_port *port;
1792         LIST_HEAD(list_kill);
1793
1794         if (!netif_is_macvlan_port(dev))
1795                 return NOTIFY_DONE;
1796
1797         port = macvlan_port_get_rtnl(dev);
1798
1799         switch (event) {
1800         case NETDEV_UP:
1801         case NETDEV_DOWN:
1802         case NETDEV_CHANGE:
1803                 list_for_each_entry(vlan, &port->vlans, list)
1804                         netif_stacked_transfer_operstate(vlan->lowerdev,
1805                                                          vlan->dev);
1806                 break;
1807         case NETDEV_FEAT_CHANGE:
1808                 list_for_each_entry(vlan, &port->vlans, list) {
1809                         netif_inherit_tso_max(vlan->dev, dev);
1810                         netdev_update_features(vlan->dev);
1811                 }
1812                 break;
1813         case NETDEV_CHANGEMTU:
1814                 list_for_each_entry(vlan, &port->vlans, list) {
1815                         if (vlan->dev->mtu <= dev->mtu)
1816                                 continue;
1817                         dev_set_mtu(vlan->dev, dev->mtu);
1818                 }
1819                 break;
1820         case NETDEV_CHANGEADDR:
1821                 if (!macvlan_passthru(port))
1822                         return NOTIFY_DONE;
1823
1824                 vlan = list_first_entry_or_null(&port->vlans,
1825                                                 struct macvlan_dev,
1826                                                 list);
1827
1828                 if (vlan && macvlan_sync_address(vlan->dev, dev->dev_addr))
1829                         return NOTIFY_BAD;
1830
1831                 break;
1832         case NETDEV_UNREGISTER:
1833                 /* twiddle thumbs on netns device moves */
1834                 if (dev->reg_state != NETREG_UNREGISTERING)
1835                         break;
1836
1837                 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1838                         vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1839                 unregister_netdevice_many(&list_kill);
1840                 break;
1841         case NETDEV_PRE_TYPE_CHANGE:
1842                 /* Forbid underlying device to change its type. */
1843                 return NOTIFY_BAD;
1844
1845         case NETDEV_NOTIFY_PEERS:
1846         case NETDEV_BONDING_FAILOVER:
1847         case NETDEV_RESEND_IGMP:
1848                 /* Propagate to all vlans */
1849                 list_for_each_entry(vlan, &port->vlans, list)
1850                         call_netdevice_notifiers(event, vlan->dev);
1851         }
1852         return NOTIFY_DONE;
1853 }
1854
1855 static struct notifier_block macvlan_notifier_block __read_mostly = {
1856         .notifier_call  = macvlan_device_event,
1857 };
1858
1859 static int __init macvlan_init_module(void)
1860 {
1861         int err;
1862
1863         register_netdevice_notifier(&macvlan_notifier_block);
1864
1865         err = macvlan_link_register(&macvlan_link_ops);
1866         if (err < 0)
1867                 goto err1;
1868         return 0;
1869 err1:
1870         unregister_netdevice_notifier(&macvlan_notifier_block);
1871         return err;
1872 }
1873
1874 static void __exit macvlan_cleanup_module(void)
1875 {
1876         rtnl_link_unregister(&macvlan_link_ops);
1877         unregister_netdevice_notifier(&macvlan_notifier_block);
1878 }
1879
1880 module_init(macvlan_init_module);
1881 module_exit(macvlan_cleanup_module);
1882
1883 MODULE_LICENSE("GPL");
1884 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1885 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1886 MODULE_ALIAS_RTNL_LINK("macvlan");