drivers/net/macvlan.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (c) 2007 Patrick McHardy <[email protected]>
   4  *
   5  * The code this is based on carried the following copyright notice:
   6  * ---
   7  * (C) Copyright 2001-2006
   8  * Alex Zeffertt, Cambridge Broadband Ltd, [email protected]
   9  * Re-worked by Ben Greear <[email protected]>
  10  * ---
  11  */
  12 #include <linux/kernel.h>
  13 #include <linux/types.h>
  14 #include <linux/module.h>
  15 #include <linux/init.h>
  16 #include <linux/errno.h>
  17 #include <linux/slab.h>
  18 #include <linux/string.h>
  19 #include <linux/rculist.h>
  20 #include <linux/notifier.h>
  21 #include <linux/netdevice.h>
  22 #include <linux/etherdevice.h>
  23 #include <linux/net_tstamp.h>
  24 #include <linux/ethtool.h>
  25 #include <linux/if_arp.h>
  26 #include <linux/if_vlan.h>
  27 #include <linux/if_link.h>
  28 #include <linux/if_macvlan.h>
  29 #include <linux/hash.h>
  30 #include <linux/workqueue.h>
  31 #include <net/rtnetlink.h>
  32 #include <net/xfrm.h>
  33 #include <linux/netpoll.h>
  34 #include <linux/phy.h>
  35
  36 #define MACVLAN_HASH_BITS       8
  37 #define MACVLAN_HASH_SIZE       (1<<MACVLAN_HASH_BITS)
  38 #define MACVLAN_DEFAULT_BC_QUEUE_LEN    1000
  39
  40 #define MACVLAN_F_PASSTHRU      1
  41 #define MACVLAN_F_ADDRCHANGE    2
  42
  43 struct macvlan_port {
  44         struct net_device       *dev;
  45         struct hlist_head       vlan_hash[MACVLAN_HASH_SIZE];
  46         struct list_head        vlans;
  47         struct sk_buff_head     bc_queue;
  48         struct work_struct      bc_work;
  49         u32                     bc_queue_len_used;
  50         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         .parse_protocol = eth_header_parse_protocol,
 613 };
 614
 615 static int macvlan_open(struct net_device *dev)
 616 {
 617         struct macvlan_dev *vlan = netdev_priv(dev);
 618         struct net_device *lowerdev = vlan->lowerdev;
 619         int err;
 620
 621         if (macvlan_passthru(vlan->port)) {
 622                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
 623                         err = dev_set_promiscuity(lowerdev, 1);
 624                         if (err < 0)
 625                                 goto out;
 626                 }
 627                 goto hash_add;
 628         }
 629
 630         err = -EADDRINUSE;
 631         if (macvlan_addr_busy(vlan->port, dev->dev_addr))
 632                 goto out;
 633
 634         /* Attempt to populate accel_priv which is used to offload the L2
 635          * forwarding requests for unicast packets.
 636          */
 637         if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD)
 638                 vlan->accel_priv =
 639                       lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
 640
 641         /* If earlier attempt to offload failed, or accel_priv is not
 642          * populated we must add the unicast address to the lower device.
 643          */
 644         if (IS_ERR_OR_NULL(vlan->accel_priv)) {
 645                 vlan->accel_priv = NULL;
 646                 err = dev_uc_add(lowerdev, dev->dev_addr);
 647                 if (err < 0)
 648                         goto out;
 649         }
 650
 651         if (dev->flags & IFF_ALLMULTI) {
 652                 err = dev_set_allmulti(lowerdev, 1);
 653                 if (err < 0)
 654                         goto del_unicast;
 655         }
 656
 657         if (dev->flags & IFF_PROMISC) {
 658                 err = dev_set_promiscuity(lowerdev, 1);
 659                 if (err < 0)
 660                         goto clear_multi;
 661         }
 662
 663 hash_add:
 664         macvlan_hash_add(vlan);
 665         return 0;
 666
 667 clear_multi:
 668         if (dev->flags & IFF_ALLMULTI)
 669                 dev_set_allmulti(lowerdev, -1);
 670 del_unicast:
 671         if (vlan->accel_priv) {
 672                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
 673                                                            vlan->accel_priv);
 674                 vlan->accel_priv = NULL;
 675         } else {
 676                 dev_uc_del(lowerdev, dev->dev_addr);
 677         }
 678 out:
 679         return err;
 680 }
 681
 682 static int macvlan_stop(struct net_device *dev)
 683 {
 684         struct macvlan_dev *vlan = netdev_priv(dev);
 685         struct net_device *lowerdev = vlan->lowerdev;
 686
 687         if (vlan->accel_priv) {
 688                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
 689                                                            vlan->accel_priv);
 690                 vlan->accel_priv = NULL;
 691         }
 692
 693         dev_uc_unsync(lowerdev, dev);
 694         dev_mc_unsync(lowerdev, dev);
 695
 696         if (macvlan_passthru(vlan->port)) {
 697                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
 698                         dev_set_promiscuity(lowerdev, -1);
 699                 goto hash_del;
 700         }
 701
 702         if (dev->flags & IFF_ALLMULTI)
 703                 dev_set_allmulti(lowerdev, -1);
 704
 705         if (dev->flags & IFF_PROMISC)
 706                 dev_set_promiscuity(lowerdev, -1);
 707
 708         dev_uc_del(lowerdev, dev->dev_addr);
 709
 710 hash_del:
 711         macvlan_hash_del(vlan, !dev->dismantle);
 712         return 0;
 713 }
 714
 715 static int macvlan_sync_address(struct net_device *dev,
 716                                 const unsigned char *addr)
 717 {
 718         struct macvlan_dev *vlan = netdev_priv(dev);
 719         struct net_device *lowerdev = vlan->lowerdev;
 720         struct macvlan_port *port = vlan->port;
 721         int err;
 722
 723         if (!(dev->flags & IFF_UP)) {
 724                 /* Just copy in the new address */
 725                 eth_hw_addr_set(dev, addr);
 726         } else {
 727                 /* Rehash and update the device filters */
 728                 if (macvlan_addr_busy(vlan->port, addr))
 729                         return -EADDRINUSE;
 730
 731                 if (!macvlan_passthru(port)) {
 732                         err = dev_uc_add(lowerdev, addr);
 733                         if (err)
 734                                 return err;
 735
 736                         dev_uc_del(lowerdev, dev->dev_addr);
 737                 }
 738
 739                 macvlan_hash_change_addr(vlan, addr);
 740         }
 741         if (macvlan_passthru(port) && !macvlan_addr_change(port)) {
 742                 /* Since addr_change isn't set, we are here due to lower
 743                  * device change.  Save the lower-dev address so we can
 744                  * restore it later.
 745                  */
 746                 ether_addr_copy(vlan->port->perm_addr,
 747                                 lowerdev->dev_addr);
 748         }
 749         macvlan_clear_addr_change(port);
 750         return 0;
 751 }
 752
 753 static int macvlan_set_mac_address(struct net_device *dev, void *p)
 754 {
 755         struct macvlan_dev *vlan = netdev_priv(dev);
 756         struct sockaddr *addr = p;
 757
 758         if (!is_valid_ether_addr(addr->sa_data))
 759                 return -EADDRNOTAVAIL;
 760
 761         /* If the addresses are the same, this is a no-op */
 762         if (ether_addr_equal(dev->dev_addr, addr->sa_data))
 763                 return 0;
 764
 765         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
 766                 macvlan_set_addr_change(vlan->port);
 767                 return dev_set_mac_address(vlan->lowerdev, addr, NULL);
 768         }
 769
 770         if (macvlan_addr_busy(vlan->port, addr->sa_data))
 771                 return -EADDRINUSE;
 772
 773         return macvlan_sync_address(dev, addr->sa_data);
 774 }
 775
 776 static void macvlan_change_rx_flags(struct net_device *dev, int change)
 777 {
 778         struct macvlan_dev *vlan = netdev_priv(dev);
 779         struct net_device *lowerdev = vlan->lowerdev;
 780
 781         if (dev->flags & IFF_UP) {
 782                 if (change & IFF_ALLMULTI)
 783                         dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 784                 if (!macvlan_passthru(vlan->port) && change & IFF_PROMISC)
 785                         dev_set_promiscuity(lowerdev,
 786                                             dev->flags & IFF_PROMISC ? 1 : -1);
 787
 788         }
 789 }
 790
 791 static void macvlan_compute_filter(unsigned long *mc_filter,
 792                                    struct net_device *dev,
 793                                    struct macvlan_dev *vlan, int cutoff)
 794 {
 795         if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
 796                 bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ);
 797         } else {
 798                 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
 799                 struct netdev_hw_addr *ha;
 800
 801                 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
 802                 netdev_for_each_mc_addr(ha, dev) {
 803                         if (!vlan && ha->synced <= cutoff)
 804                                 continue;
 805
 806                         __set_bit(mc_hash(vlan, ha->addr), filter);
 807                 }
 808
 809                 __set_bit(mc_hash(vlan, dev->broadcast), filter);
 810
 811                 bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ);
 812         }
 813 }
 814
 815 static void macvlan_recompute_bc_filter(struct macvlan_dev *vlan)
 816 {
 817         if (vlan->port->bc_cutoff < 0) {
 818                 bitmap_zero(vlan->port->bc_filter, MACVLAN_MC_FILTER_SZ);
 819                 return;
 820         }
 821
 822         macvlan_compute_filter(vlan->port->bc_filter, vlan->lowerdev, NULL,
 823                                vlan->port->bc_cutoff);
 824 }
 825
 826 static void macvlan_set_mac_lists(struct net_device *dev)
 827 {
 828         struct macvlan_dev *vlan = netdev_priv(dev);
 829
 830         macvlan_compute_filter(vlan->mc_filter, dev, vlan, 0);
 831
 832         dev_uc_sync(vlan->lowerdev, dev);
 833         dev_mc_sync(vlan->lowerdev, dev);
 834
 835         /* This is slightly inaccurate as we're including the subscription
 836          * list of vlan->lowerdev too.
 837          *
 838          * Bug alert: This only works if everyone has the same broadcast
 839          * address as lowerdev.  As soon as someone changes theirs this
 840          * will break.
 841          *
 842          * However, this is already broken as when you change your broadcast
 843          * address we don't get called.
 844          *
 845          * The solution is to maintain a list of broadcast addresses like
 846          * we do for uc/mc, if you care.
 847          */
 848         macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL,
 849                                0);
 850         macvlan_recompute_bc_filter(vlan);
 851 }
 852
 853 static void update_port_bc_cutoff(struct macvlan_dev *vlan, int cutoff)
 854 {
 855         if (vlan->port->bc_cutoff == cutoff)
 856                 return;
 857
 858         vlan->port->bc_cutoff = cutoff;
 859         macvlan_recompute_bc_filter(vlan);
 860 }
 861
 862 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
 863 {
 864         struct macvlan_dev *vlan = netdev_priv(dev);
 865
 866         if (vlan->lowerdev->mtu < new_mtu)
 867                 return -EINVAL;
 868         WRITE_ONCE(dev->mtu, new_mtu);
 869         return 0;
 870 }
 871
 872 static int macvlan_hwtstamp_get(struct net_device *dev,
 873                                 struct kernel_hwtstamp_config *cfg)
 874 {
 875         struct net_device *real_dev = macvlan_dev_real_dev(dev);
 876
 877         return generic_hwtstamp_get_lower(real_dev, cfg);
 878 }
 879
 880 static int macvlan_hwtstamp_set(struct net_device *dev,
 881                                 struct kernel_hwtstamp_config *cfg,
 882                                 struct netlink_ext_ack *extack)
 883 {
 884         struct net_device *real_dev = macvlan_dev_real_dev(dev);
 885
 886         if (!net_eq(dev_net(dev), &init_net))
 887                 return -EOPNOTSUPP;
 888
 889         return generic_hwtstamp_set_lower(real_dev, cfg, extack);
 890 }
 891
 892 /*
 893  * macvlan network devices have devices nesting below it and are a special
 894  * "super class" of normal network devices; split their locks off into a
 895  * separate class since they always nest.
 896  */
 897 static struct lock_class_key macvlan_netdev_addr_lock_key;
 898
 899 #define ALWAYS_ON_OFFLOADS \
 900         (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | \
 901          NETIF_F_GSO_ROBUST | NETIF_F_GSO_ENCAP_ALL)
 902
 903 #define ALWAYS_ON_FEATURES ALWAYS_ON_OFFLOADS
 904
 905 #define MACVLAN_FEATURES \
 906         (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
 907          NETIF_F_GSO | NETIF_F_TSO | NETIF_F_LRO | \
 908          NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
 909          NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
 910
 911 #define MACVLAN_STATE_MASK \
 912         ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
 913
 914 static void macvlan_set_lockdep_class(struct net_device *dev)
 915 {
 916         netdev_lockdep_set_classes(dev);
 917         lockdep_set_class(&dev->addr_list_lock,
 918                           &macvlan_netdev_addr_lock_key);
 919 }
 920
 921 static int macvlan_init(struct net_device *dev)
 922 {
 923         struct macvlan_dev *vlan = netdev_priv(dev);
 924         struct net_device *lowerdev = vlan->lowerdev;
 925         struct macvlan_port *port = vlan->port;
 926
 927         dev->state              = (dev->state & ~MACVLAN_STATE_MASK) |
 928                                   (lowerdev->state & MACVLAN_STATE_MASK);
 929         dev->features           = lowerdev->features & MACVLAN_FEATURES;
 930         dev->features           |= ALWAYS_ON_FEATURES;
 931         dev->hw_features        |= NETIF_F_LRO;
 932         dev->vlan_features      = lowerdev->vlan_features & MACVLAN_FEATURES;
 933         dev->vlan_features      |= ALWAYS_ON_OFFLOADS;
 934         dev->hw_enc_features    |= dev->features;
 935         dev->lltx               = true;
 936         netif_inherit_tso_max(dev, lowerdev);
 937         dev->hard_header_len    = lowerdev->hard_header_len;
 938         macvlan_set_lockdep_class(dev);
 939
 940         vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
 941         if (!vlan->pcpu_stats)
 942                 return -ENOMEM;
 943
 944         port->count += 1;
 945
 946         /* Get macvlan's reference to lowerdev */
 947         netdev_hold(lowerdev, &vlan->dev_tracker, GFP_KERNEL);
 948
 949         return 0;
 950 }
 951
 952 static void macvlan_uninit(struct net_device *dev)
 953 {
 954         struct macvlan_dev *vlan = netdev_priv(dev);
 955         struct macvlan_port *port = vlan->port;
 956
 957         free_percpu(vlan->pcpu_stats);
 958
 959         macvlan_flush_sources(port, vlan);
 960         port->count -= 1;
 961         if (!port->count)
 962                 macvlan_port_destroy(port->dev);
 963 }
 964
 965 static void macvlan_dev_get_stats64(struct net_device *dev,
 966                                     struct rtnl_link_stats64 *stats)
 967 {
 968         struct macvlan_dev *vlan = netdev_priv(dev);
 969
 970         if (vlan->pcpu_stats) {
 971                 struct vlan_pcpu_stats *p;
 972                 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
 973                 u32 rx_errors = 0, tx_dropped = 0;
 974                 unsigned int start;
 975                 int i;
 976
 977                 for_each_possible_cpu(i) {
 978                         p = per_cpu_ptr(vlan->pcpu_stats, i);
 979                         do {
 980                                 start = u64_stats_fetch_begin(&p->syncp);
 981                                 rx_packets      = u64_stats_read(&p->rx_packets);
 982                                 rx_bytes        = u64_stats_read(&p->rx_bytes);
 983                                 rx_multicast    = u64_stats_read(&p->rx_multicast);
 984                                 tx_packets      = u64_stats_read(&p->tx_packets);
 985                                 tx_bytes        = u64_stats_read(&p->tx_bytes);
 986                         } while (u64_stats_fetch_retry(&p->syncp, start));
 987
 988                         stats->rx_packets       += rx_packets;
 989                         stats->rx_bytes         += rx_bytes;
 990                         stats->multicast        += rx_multicast;
 991                         stats->tx_packets       += tx_packets;
 992                         stats->tx_bytes         += tx_bytes;
 993                         /* rx_errors & tx_dropped are u32, updated
 994                          * without syncp protection.
 995                          */
 996                         rx_errors       += READ_ONCE(p->rx_errors);
 997                         tx_dropped      += READ_ONCE(p->tx_dropped);
 998                 }
 999                 stats->rx_errors        = rx_errors;
1000                 stats->rx_dropped       = rx_errors;
1001                 stats->tx_dropped       = tx_dropped;
1002         }
1003 }
1004
1005 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
1006                                    __be16 proto, u16 vid)
1007 {
1008         struct macvlan_dev *vlan = netdev_priv(dev);
1009         struct net_device *lowerdev = vlan->lowerdev;
1010
1011         return vlan_vid_add(lowerdev, proto, vid);
1012 }
1013
1014 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
1015                                     __be16 proto, u16 vid)
1016 {
1017         struct macvlan_dev *vlan = netdev_priv(dev);
1018         struct net_device *lowerdev = vlan->lowerdev;
1019
1020         vlan_vid_del(lowerdev, proto, vid);
1021         return 0;
1022 }
1023
1024 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
1025                            struct net_device *dev,
1026                            const unsigned char *addr, u16 vid,
1027                            u16 flags,
1028                            struct netlink_ext_ack *extack)
1029 {
1030         struct macvlan_dev *vlan = netdev_priv(dev);
1031         int err = -EINVAL;
1032
1033         /* Support unicast filter only on passthru devices.
1034          * Multicast filter should be allowed on all devices.
1035          */
1036         if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
1037                 return -EOPNOTSUPP;
1038
1039         if (flags & NLM_F_REPLACE)
1040                 return -EOPNOTSUPP;
1041
1042         if (is_unicast_ether_addr(addr))
1043                 err = dev_uc_add_excl(dev, addr);
1044         else if (is_multicast_ether_addr(addr))
1045                 err = dev_mc_add_excl(dev, addr);
1046
1047         return err;
1048 }
1049
1050 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
1051                            struct net_device *dev,
1052                            const unsigned char *addr, u16 vid,
1053                            struct netlink_ext_ack *extack)
1054 {
1055         struct macvlan_dev *vlan = netdev_priv(dev);
1056         int err = -EINVAL;
1057
1058         /* Support unicast filter only on passthru devices.
1059          * Multicast filter should be allowed on all devices.
1060          */
1061         if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
1062                 return -EOPNOTSUPP;
1063
1064         if (is_unicast_ether_addr(addr))
1065                 err = dev_uc_del(dev, addr);
1066         else if (is_multicast_ether_addr(addr))
1067                 err = dev_mc_del(dev, addr);
1068
1069         return err;
1070 }
1071
1072 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
1073                                         struct ethtool_drvinfo *drvinfo)
1074 {
1075         strscpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
1076         strscpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
1077 }
1078
1079 static int macvlan_ethtool_get_link_ksettings(struct net_device *dev,
1080                                               struct ethtool_link_ksettings *cmd)
1081 {
1082         const struct macvlan_dev *vlan = netdev_priv(dev);
1083
1084         return __ethtool_get_link_ksettings(vlan->lowerdev, cmd);
1085 }
1086
1087 static int macvlan_ethtool_get_ts_info(struct net_device *dev,
1088                                        struct kernel_ethtool_ts_info *info)
1089 {
1090         struct net_device *real_dev = macvlan_dev_real_dev(dev);
1091
1092         return ethtool_get_ts_info_by_layer(real_dev, info);
1093 }
1094
1095 static netdev_features_t macvlan_fix_features(struct net_device *dev,
1096                                               netdev_features_t features)
1097 {
1098         struct macvlan_dev *vlan = netdev_priv(dev);
1099         netdev_features_t lowerdev_features = vlan->lowerdev->features;
1100         netdev_features_t mask;
1101
1102         features |= NETIF_F_ALL_FOR_ALL;
1103         features &= (vlan->set_features | ~MACVLAN_FEATURES);
1104         mask = features;
1105
1106         lowerdev_features &= (features | ~NETIF_F_LRO);
1107         features = netdev_increment_features(lowerdev_features, features, mask);
1108         features |= ALWAYS_ON_FEATURES;
1109         features &= (ALWAYS_ON_FEATURES | MACVLAN_FEATURES);
1110
1111         return features;
1112 }
1113
1114 #ifdef CONFIG_NET_POLL_CONTROLLER
1115 static void macvlan_dev_poll_controller(struct net_device *dev)
1116 {
1117         return;
1118 }
1119
1120 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
1121 {
1122         struct macvlan_dev *vlan = netdev_priv(dev);
1123         struct net_device *real_dev = vlan->lowerdev;
1124         struct netpoll *netpoll;
1125         int err;
1126
1127         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
1128         err = -ENOMEM;
1129         if (!netpoll)
1130                 goto out;
1131
1132         err = __netpoll_setup(netpoll, real_dev);
1133         if (err) {
1134                 kfree(netpoll);
1135                 goto out;
1136         }
1137
1138         vlan->netpoll = netpoll;
1139
1140 out:
1141         return err;
1142 }
1143
1144 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
1145 {
1146         struct macvlan_dev *vlan = netdev_priv(dev);
1147         struct netpoll *netpoll = vlan->netpoll;
1148
1149         if (!netpoll)
1150                 return;
1151
1152         vlan->netpoll = NULL;
1153
1154         __netpoll_free(netpoll);
1155 }
1156 #endif  /* CONFIG_NET_POLL_CONTROLLER */
1157
1158 static int macvlan_dev_get_iflink(const struct net_device *dev)
1159 {
1160         struct macvlan_dev *vlan = netdev_priv(dev);
1161
1162         return READ_ONCE(vlan->lowerdev->ifindex);
1163 }
1164
1165 static const struct ethtool_ops macvlan_ethtool_ops = {
1166         .get_link               = ethtool_op_get_link,
1167         .get_link_ksettings     = macvlan_ethtool_get_link_ksettings,
1168         .get_drvinfo            = macvlan_ethtool_get_drvinfo,
1169         .get_ts_info            = macvlan_ethtool_get_ts_info,
1170 };
1171
1172 static const struct net_device_ops macvlan_netdev_ops = {
1173         .ndo_init               = macvlan_init,
1174         .ndo_uninit             = macvlan_uninit,
1175         .ndo_open               = macvlan_open,
1176         .ndo_stop               = macvlan_stop,
1177         .ndo_start_xmit         = macvlan_start_xmit,
1178         .ndo_change_mtu         = macvlan_change_mtu,
1179         .ndo_fix_features       = macvlan_fix_features,
1180         .ndo_change_rx_flags    = macvlan_change_rx_flags,
1181         .ndo_set_mac_address    = macvlan_set_mac_address,
1182         .ndo_set_rx_mode        = macvlan_set_mac_lists,
1183         .ndo_get_stats64        = macvlan_dev_get_stats64,
1184         .ndo_validate_addr      = eth_validate_addr,
1185         .ndo_vlan_rx_add_vid    = macvlan_vlan_rx_add_vid,
1186         .ndo_vlan_rx_kill_vid   = macvlan_vlan_rx_kill_vid,
1187         .ndo_fdb_add            = macvlan_fdb_add,
1188         .ndo_fdb_del            = macvlan_fdb_del,
1189         .ndo_fdb_dump           = ndo_dflt_fdb_dump,
1190 #ifdef CONFIG_NET_POLL_CONTROLLER
1191         .ndo_poll_controller    = macvlan_dev_poll_controller,
1192         .ndo_netpoll_setup      = macvlan_dev_netpoll_setup,
1193         .ndo_netpoll_cleanup    = macvlan_dev_netpoll_cleanup,
1194 #endif
1195         .ndo_get_iflink         = macvlan_dev_get_iflink,
1196         .ndo_features_check     = passthru_features_check,
1197         .ndo_hwtstamp_get       = macvlan_hwtstamp_get,
1198         .ndo_hwtstamp_set       = macvlan_hwtstamp_set,
1199 };
1200
1201 static void macvlan_dev_free(struct net_device *dev)
1202 {
1203         struct macvlan_dev *vlan = netdev_priv(dev);
1204
1205         /* Get rid of the macvlan's reference to lowerdev */
1206         netdev_put(vlan->lowerdev, &vlan->dev_tracker);
1207 }
1208
1209 void macvlan_common_setup(struct net_device *dev)
1210 {
1211         ether_setup(dev);
1212
1213         /* ether_setup() has set dev->min_mtu to ETH_MIN_MTU. */
1214         dev->max_mtu            = ETH_MAX_MTU;
1215         dev->priv_flags        &= ~IFF_TX_SKB_SHARING;
1216         netif_keep_dst(dev);
1217         dev->priv_flags        |= IFF_UNICAST_FLT;
1218         dev->change_proto_down  = true;
1219         dev->netdev_ops         = &macvlan_netdev_ops;
1220         dev->needs_free_netdev  = true;
1221         dev->priv_destructor    = macvlan_dev_free;
1222         dev->header_ops         = &macvlan_hard_header_ops;
1223         dev->ethtool_ops        = &macvlan_ethtool_ops;
1224 }
1225 EXPORT_SYMBOL_GPL(macvlan_common_setup);
1226
1227 static void macvlan_setup(struct net_device *dev)
1228 {
1229         macvlan_common_setup(dev);
1230         dev->priv_flags |= IFF_NO_QUEUE;
1231 }
1232
1233 static int macvlan_port_create(struct net_device *dev)
1234 {
1235         struct macvlan_port *port;
1236         unsigned int i;
1237         int err;
1238
1239         if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1240                 return -EINVAL;
1241
1242         if (netdev_is_rx_handler_busy(dev))
1243                 return -EBUSY;
1244
1245         port = kzalloc(sizeof(*port), GFP_KERNEL);
1246         if (port == NULL)
1247                 return -ENOMEM;
1248
1249         port->dev = dev;
1250         ether_addr_copy(port->perm_addr, dev->dev_addr);
1251         INIT_LIST_HEAD(&port->vlans);
1252         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1253                 INIT_HLIST_HEAD(&port->vlan_hash[i]);
1254         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1255                 INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1256
1257         port->bc_queue_len_used = 0;
1258         port->bc_cutoff = 1;
1259         skb_queue_head_init(&port->bc_queue);
1260         INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1261
1262         err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1263         if (err)
1264                 kfree(port);
1265         else
1266                 dev->priv_flags |= IFF_MACVLAN_PORT;
1267         return err;
1268 }
1269
1270 static void macvlan_port_destroy(struct net_device *dev)
1271 {
1272         struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1273         struct sk_buff *skb;
1274
1275         dev->priv_flags &= ~IFF_MACVLAN_PORT;
1276         netdev_rx_handler_unregister(dev);
1277
1278         /* After this point, no packet can schedule bc_work anymore,
1279          * but we need to cancel it and purge left skbs if any.
1280          */
1281         cancel_work_sync(&port->bc_work);
1282
1283         while ((skb = __skb_dequeue(&port->bc_queue))) {
1284                 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
1285
1286                 if (src)
1287                         dev_put(src->dev);
1288
1289                 kfree_skb(skb);
1290         }
1291
1292         /* If the lower device address has been changed by passthru
1293          * macvlan, put it back.
1294          */
1295         if (macvlan_passthru(port) &&
1296             !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) {
1297                 struct sockaddr sa;
1298
1299                 sa.sa_family = port->dev->type;
1300                 memcpy(&sa.sa_data, port->perm_addr, port->dev->addr_len);
1301                 dev_set_mac_address(port->dev, &sa, NULL);
1302         }
1303
1304         kfree(port);
1305 }
1306
1307 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[],
1308                             struct netlink_ext_ack *extack)
1309 {
1310         struct nlattr *nla, *head;
1311         int rem, len;
1312
1313         if (tb[IFLA_ADDRESS]) {
1314                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1315                         return -EINVAL;
1316                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1317                         return -EADDRNOTAVAIL;
1318         }
1319
1320         if (!data)
1321                 return 0;
1322
1323         if (data[IFLA_MACVLAN_FLAGS] &&
1324             nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~(MACVLAN_FLAG_NOPROMISC |
1325                                                       MACVLAN_FLAG_NODST))
1326                 return -EINVAL;
1327
1328         if (data[IFLA_MACVLAN_MODE]) {
1329                 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1330                 case MACVLAN_MODE_PRIVATE:
1331                 case MACVLAN_MODE_VEPA:
1332                 case MACVLAN_MODE_BRIDGE:
1333                 case MACVLAN_MODE_PASSTHRU:
1334                 case MACVLAN_MODE_SOURCE:
1335                         break;
1336                 default:
1337                         return -EINVAL;
1338                 }
1339         }
1340
1341         if (data[IFLA_MACVLAN_MACADDR_MODE]) {
1342                 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1343                 case MACVLAN_MACADDR_ADD:
1344                 case MACVLAN_MACADDR_DEL:
1345                 case MACVLAN_MACADDR_FLUSH:
1346                 case MACVLAN_MACADDR_SET:
1347                         break;
1348                 default:
1349                         return -EINVAL;
1350                 }
1351         }
1352
1353         if (data[IFLA_MACVLAN_MACADDR]) {
1354                 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1355                         return -EINVAL;
1356
1357                 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1358                         return -EADDRNOTAVAIL;
1359         }
1360
1361         if (data[IFLA_MACVLAN_MACADDR_DATA]) {
1362                 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1363                 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1364
1365                 nla_for_each_attr(nla, head, len, rem) {
1366                         if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1367                             nla_len(nla) != ETH_ALEN)
1368                                 return -EINVAL;
1369
1370                         if (!is_valid_ether_addr(nla_data(nla)))
1371                                 return -EADDRNOTAVAIL;
1372                 }
1373         }
1374
1375         if (data[IFLA_MACVLAN_MACADDR_COUNT])
1376                 return -EINVAL;
1377
1378         return 0;
1379 }
1380
1381 /*
1382  * reconfigure list of remote source mac address
1383  * (only for macvlan devices in source mode)
1384  * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1385  * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1386  */
1387 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1388                                       struct nlattr *data[])
1389 {
1390         char *addr = NULL;
1391         int ret, rem, len;
1392         struct nlattr *nla, *head;
1393         struct macvlan_source_entry *entry;
1394
1395         if (data[IFLA_MACVLAN_MACADDR])
1396                 addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1397
1398         if (mode == MACVLAN_MACADDR_ADD) {
1399                 if (!addr)
1400                         return -EINVAL;
1401
1402                 return macvlan_hash_add_source(vlan, addr);
1403
1404         } else if (mode == MACVLAN_MACADDR_DEL) {
1405                 if (!addr)
1406                         return -EINVAL;
1407
1408                 entry = macvlan_hash_lookup_source(vlan, addr);
1409                 if (entry) {
1410                         macvlan_hash_del_source(entry);
1411                         vlan->macaddr_count--;
1412                 }
1413         } else if (mode == MACVLAN_MACADDR_FLUSH) {
1414                 macvlan_flush_sources(vlan->port, vlan);
1415         } else if (mode == MACVLAN_MACADDR_SET) {
1416                 macvlan_flush_sources(vlan->port, vlan);
1417
1418                 if (addr) {
1419                         ret = macvlan_hash_add_source(vlan, addr);
1420                         if (ret)
1421                                 return ret;
1422                 }
1423
1424                 if (!data[IFLA_MACVLAN_MACADDR_DATA])
1425                         return 0;
1426
1427                 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1428                 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1429
1430                 nla_for_each_attr(nla, head, len, rem) {
1431                         addr = nla_data(nla);
1432                         ret = macvlan_hash_add_source(vlan, addr);
1433                         if (ret)
1434                                 return ret;
1435                 }
1436         } else {
1437                 return -EINVAL;
1438         }
1439
1440         return 0;
1441 }
1442
1443 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1444                            struct nlattr *tb[], struct nlattr *data[],
1445                            struct netlink_ext_ack *extack)
1446 {
1447         struct macvlan_dev *vlan = netdev_priv(dev);
1448         struct macvlan_port *port;
1449         struct net_device *lowerdev;
1450         int err;
1451         int macmode;
1452         bool create = false;
1453
1454         if (!tb[IFLA_LINK])
1455                 return -EINVAL;
1456
1457         lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1458         if (lowerdev == NULL)
1459                 return -ENODEV;
1460
1461         /* When creating macvlans or macvtaps on top of other macvlans - use
1462          * the real device as the lowerdev.
1463          */
1464         if (netif_is_macvlan(lowerdev))
1465                 lowerdev = macvlan_dev_real_dev(lowerdev);
1466
1467         if (!tb[IFLA_MTU])
1468                 dev->mtu = lowerdev->mtu;
1469         else if (dev->mtu > lowerdev->mtu)
1470                 return -EINVAL;
1471
1472         /* MTU range: 68 - lowerdev->max_mtu */
1473         dev->min_mtu = ETH_MIN_MTU;
1474         dev->max_mtu = lowerdev->max_mtu;
1475
1476         if (!tb[IFLA_ADDRESS])
1477                 eth_hw_addr_random(dev);
1478
1479         if (!netif_is_macvlan_port(lowerdev)) {
1480                 err = macvlan_port_create(lowerdev);
1481                 if (err < 0)
1482                         return err;
1483                 create = true;
1484         }
1485         port = macvlan_port_get_rtnl(lowerdev);
1486
1487         /* Only 1 macvlan device can be created in passthru mode */
1488         if (macvlan_passthru(port)) {
1489                 /* The macvlan port must be not created this time,
1490                  * still goto destroy_macvlan_port for readability.
1491                  */
1492                 err = -EINVAL;
1493                 goto destroy_macvlan_port;
1494         }
1495
1496         vlan->lowerdev = lowerdev;
1497         vlan->dev      = dev;
1498         vlan->port     = port;
1499         vlan->set_features = MACVLAN_FEATURES;
1500
1501         vlan->mode     = MACVLAN_MODE_VEPA;
1502         if (data && data[IFLA_MACVLAN_MODE])
1503                 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1504
1505         if (data && data[IFLA_MACVLAN_FLAGS])
1506                 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1507
1508         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1509                 if (port->count) {
1510                         err = -EINVAL;
1511                         goto destroy_macvlan_port;
1512                 }
1513                 macvlan_set_passthru(port);
1514                 eth_hw_addr_inherit(dev, lowerdev);
1515         }
1516
1517         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1518                 if (vlan->mode != MACVLAN_MODE_SOURCE) {
1519                         err = -EINVAL;
1520                         goto destroy_macvlan_port;
1521                 }
1522                 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1523                 err = macvlan_changelink_sources(vlan, macmode, data);
1524                 if (err)
1525                         goto destroy_macvlan_port;
1526         }
1527
1528         vlan->bc_queue_len_req = MACVLAN_DEFAULT_BC_QUEUE_LEN;
1529         if (data && data[IFLA_MACVLAN_BC_QUEUE_LEN])
1530                 vlan->bc_queue_len_req = nla_get_u32(data[IFLA_MACVLAN_BC_QUEUE_LEN]);
1531
1532         if (data && data[IFLA_MACVLAN_BC_CUTOFF])
1533                 update_port_bc_cutoff(
1534                         vlan, nla_get_s32(data[IFLA_MACVLAN_BC_CUTOFF]));
1535
1536         err = register_netdevice(dev);
1537         if (err < 0)
1538                 goto destroy_macvlan_port;
1539
1540         dev->priv_flags |= IFF_MACVLAN;
1541         err = netdev_upper_dev_link(lowerdev, dev, extack);
1542         if (err)
1543                 goto unregister_netdev;
1544
1545         list_add_tail_rcu(&vlan->list, &port->vlans);
1546         update_port_bc_queue_len(vlan->port);
1547         netif_stacked_transfer_operstate(lowerdev, dev);
1548         linkwatch_fire_event(dev);
1549
1550         return 0;
1551
1552 unregister_netdev:
1553         /* macvlan_uninit would free the macvlan port */
1554         unregister_netdevice(dev);
1555         return err;
1556 destroy_macvlan_port:
1557         /* the macvlan port may be freed by macvlan_uninit when fail to register.
1558          * so we destroy the macvlan port only when it's valid.
1559          */
1560         if (create && macvlan_port_get_rtnl(lowerdev)) {
1561                 macvlan_flush_sources(port, vlan);
1562                 macvlan_port_destroy(port->dev);
1563         }
1564         return err;
1565 }
1566 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1567
1568 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1569                            struct nlattr *tb[], struct nlattr *data[],
1570                            struct netlink_ext_ack *extack)
1571 {
1572         return macvlan_common_newlink(src_net, dev, tb, data, extack);
1573 }
1574
1575 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1576 {
1577         struct macvlan_dev *vlan = netdev_priv(dev);
1578
1579         if (vlan->mode == MACVLAN_MODE_SOURCE)
1580                 macvlan_flush_sources(vlan->port, vlan);
1581         list_del_rcu(&vlan->list);
1582         update_port_bc_queue_len(vlan->port);
1583         unregister_netdevice_queue(dev, head);
1584         netdev_upper_dev_unlink(vlan->lowerdev, dev);
1585 }
1586 EXPORT_SYMBOL_GPL(macvlan_dellink);
1587
1588 static int macvlan_changelink(struct net_device *dev,
1589                               struct nlattr *tb[], struct nlattr *data[],
1590                               struct netlink_ext_ack *extack)
1591 {
1592         struct macvlan_dev *vlan = netdev_priv(dev);
1593         enum macvlan_mode mode;
1594         bool set_mode = false;
1595         enum macvlan_macaddr_mode macmode;
1596         int ret;
1597
1598         /* Validate mode, but don't set yet: setting flags may fail. */
1599         if (data && data[IFLA_MACVLAN_MODE]) {
1600                 set_mode = true;
1601                 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1602                 /* Passthrough mode can't be set or cleared dynamically */
1603                 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1604                     (vlan->mode == MACVLAN_MODE_PASSTHRU))
1605                         return -EINVAL;
1606                 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1607                     vlan->mode != mode)
1608                         macvlan_flush_sources(vlan->port, vlan);
1609         }
1610
1611         if (data && data[IFLA_MACVLAN_FLAGS]) {
1612                 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1613                 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1614                 if (macvlan_passthru(vlan->port) && promisc) {
1615                         int err;
1616
1617                         if (flags & MACVLAN_FLAG_NOPROMISC)
1618                                 err = dev_set_promiscuity(vlan->lowerdev, -1);
1619                         else
1620                                 err = dev_set_promiscuity(vlan->lowerdev, 1);
1621                         if (err < 0)
1622                                 return err;
1623                 }
1624                 vlan->flags = flags;
1625         }
1626
1627         if (data && data[IFLA_MACVLAN_BC_QUEUE_LEN]) {
1628                 vlan->bc_queue_len_req = nla_get_u32(data[IFLA_MACVLAN_BC_QUEUE_LEN]);
1629                 update_port_bc_queue_len(vlan->port);
1630         }
1631
1632         if (data && data[IFLA_MACVLAN_BC_CUTOFF])
1633                 update_port_bc_cutoff(
1634                         vlan, nla_get_s32(data[IFLA_MACVLAN_BC_CUTOFF]));
1635
1636         if (set_mode)
1637                 vlan->mode = mode;
1638         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1639                 if (vlan->mode != MACVLAN_MODE_SOURCE)
1640                         return -EINVAL;
1641                 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1642                 ret = macvlan_changelink_sources(vlan, macmode, data);
1643                 if (ret)
1644                         return ret;
1645         }
1646         return 0;
1647 }
1648
1649 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1650 {
1651         if (vlan->macaddr_count == 0)
1652                 return 0;
1653         return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1654                 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1655 }
1656
1657 static size_t macvlan_get_size(const struct net_device *dev)
1658 {
1659         struct macvlan_dev *vlan = netdev_priv(dev);
1660
1661         return (0
1662                 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1663                 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1664                 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1665                 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1666                 + nla_total_size(4) /* IFLA_MACVLAN_BC_QUEUE_LEN */
1667                 + nla_total_size(4) /* IFLA_MACVLAN_BC_QUEUE_LEN_USED */
1668                 );
1669 }
1670
1671 static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1672                                      const struct macvlan_dev *vlan,
1673                                      const int i)
1674 {
1675         struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1676         struct macvlan_source_entry *entry;
1677
1678         hlist_for_each_entry_rcu(entry, h, hlist, lockdep_rtnl_is_held()) {
1679                 if (entry->vlan != vlan)
1680                         continue;
1681                 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1682                         return 1;
1683         }
1684         return 0;
1685 }
1686
1687 static int macvlan_fill_info(struct sk_buff *skb,
1688                                 const struct net_device *dev)
1689 {
1690         struct macvlan_dev *vlan = netdev_priv(dev);
1691         struct macvlan_port *port = vlan->port;
1692         int i;
1693         struct nlattr *nest;
1694
1695         if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1696                 goto nla_put_failure;
1697         if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1698                 goto nla_put_failure;
1699         if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1700                 goto nla_put_failure;
1701         if (vlan->macaddr_count > 0) {
1702                 nest = nla_nest_start_noflag(skb, IFLA_MACVLAN_MACADDR_DATA);
1703                 if (nest == NULL)
1704                         goto nla_put_failure;
1705
1706                 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1707                         if (macvlan_fill_info_macaddr(skb, vlan, i))
1708                                 goto nla_put_failure;
1709                 }
1710                 nla_nest_end(skb, nest);
1711         }
1712         if (nla_put_u32(skb, IFLA_MACVLAN_BC_QUEUE_LEN, vlan->bc_queue_len_req))
1713                 goto nla_put_failure;
1714         if (nla_put_u32(skb, IFLA_MACVLAN_BC_QUEUE_LEN_USED, port->bc_queue_len_used))
1715                 goto nla_put_failure;
1716         if (port->bc_cutoff != 1 &&
1717             nla_put_s32(skb, IFLA_MACVLAN_BC_CUTOFF, port->bc_cutoff))
1718                 goto nla_put_failure;
1719         return 0;
1720
1721 nla_put_failure:
1722         return -EMSGSIZE;
1723 }
1724
1725 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1726         [IFLA_MACVLAN_MODE]  = { .type = NLA_U32 },
1727         [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1728         [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1729         [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1730         [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1731         [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1732         [IFLA_MACVLAN_BC_QUEUE_LEN] = { .type = NLA_U32 },
1733         [IFLA_MACVLAN_BC_QUEUE_LEN_USED] = { .type = NLA_REJECT },
1734         [IFLA_MACVLAN_BC_CUTOFF] = { .type = NLA_S32 },
1735 };
1736
1737 int macvlan_link_register(struct rtnl_link_ops *ops)
1738 {
1739         /* common fields */
1740         ops->validate           = macvlan_validate;
1741         ops->maxtype            = IFLA_MACVLAN_MAX;
1742         ops->policy             = macvlan_policy;
1743         ops->changelink         = macvlan_changelink;
1744         ops->get_size           = macvlan_get_size;
1745         ops->fill_info          = macvlan_fill_info;
1746
1747         return rtnl_link_register(ops);
1748 };
1749 EXPORT_SYMBOL_GPL(macvlan_link_register);
1750
1751 static struct net *macvlan_get_link_net(const struct net_device *dev)
1752 {
1753         return dev_net(macvlan_dev_real_dev(dev));
1754 }
1755
1756 static struct rtnl_link_ops macvlan_link_ops = {
1757         .kind           = "macvlan",
1758         .setup          = macvlan_setup,
1759         .newlink        = macvlan_newlink,
1760         .dellink        = macvlan_dellink,
1761         .get_link_net   = macvlan_get_link_net,
1762         .priv_size      = sizeof(struct macvlan_dev),
1763 };
1764
1765 static void update_port_bc_queue_len(struct macvlan_port *port)
1766 {
1767         u32 max_bc_queue_len_req = 0;
1768         struct macvlan_dev *vlan;
1769
1770         list_for_each_entry(vlan, &port->vlans, list) {
1771                 if (vlan->bc_queue_len_req > max_bc_queue_len_req)
1772                         max_bc_queue_len_req = vlan->bc_queue_len_req;
1773         }
1774         port->bc_queue_len_used = max_bc_queue_len_req;
1775 }
1776
1777 static int macvlan_device_event(struct notifier_block *unused,
1778                                 unsigned long event, void *ptr)
1779 {
1780         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1781         struct macvlan_dev *vlan, *next;
1782         struct macvlan_port *port;
1783         LIST_HEAD(list_kill);
1784
1785         if (!netif_is_macvlan_port(dev))
1786                 return NOTIFY_DONE;
1787
1788         port = macvlan_port_get_rtnl(dev);
1789
1790         switch (event) {
1791         case NETDEV_UP:
1792         case NETDEV_DOWN:
1793         case NETDEV_CHANGE:
1794                 list_for_each_entry(vlan, &port->vlans, list)
1795                         netif_stacked_transfer_operstate(vlan->lowerdev,
1796                                                          vlan->dev);
1797                 break;
1798         case NETDEV_FEAT_CHANGE:
1799                 list_for_each_entry(vlan, &port->vlans, list) {
1800                         netif_inherit_tso_max(vlan->dev, dev);
1801                         netdev_update_features(vlan->dev);
1802                 }
1803                 break;
1804         case NETDEV_CHANGEMTU:
1805                 list_for_each_entry(vlan, &port->vlans, list) {
1806                         if (vlan->dev->mtu <= dev->mtu)
1807                                 continue;
1808                         dev_set_mtu(vlan->dev, dev->mtu);
1809                 }
1810                 break;
1811         case NETDEV_CHANGEADDR:
1812                 if (!macvlan_passthru(port))
1813                         return NOTIFY_DONE;
1814
1815                 vlan = list_first_entry_or_null(&port->vlans,
1816                                                 struct macvlan_dev,
1817                                                 list);
1818
1819                 if (vlan && macvlan_sync_address(vlan->dev, dev->dev_addr))
1820                         return NOTIFY_BAD;
1821
1822                 break;
1823         case NETDEV_UNREGISTER:
1824                 /* twiddle thumbs on netns device moves */
1825                 if (dev->reg_state != NETREG_UNREGISTERING)
1826                         break;
1827
1828                 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1829                         vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1830                 unregister_netdevice_many(&list_kill);
1831                 break;
1832         case NETDEV_PRE_TYPE_CHANGE:
1833                 /* Forbid underlying device to change its type. */
1834                 return NOTIFY_BAD;
1835
1836         case NETDEV_NOTIFY_PEERS:
1837         case NETDEV_BONDING_FAILOVER:
1838         case NETDEV_RESEND_IGMP:
1839                 /* Propagate to all vlans */
1840                 list_for_each_entry(vlan, &port->vlans, list)
1841                         call_netdevice_notifiers(event, vlan->dev);
1842         }
1843         return NOTIFY_DONE;
1844 }
1845
1846 static struct notifier_block macvlan_notifier_block __read_mostly = {
1847         .notifier_call  = macvlan_device_event,
1848 };
1849
1850 static int __init macvlan_init_module(void)
1851 {
1852         int err;
1853
1854         register_netdevice_notifier(&macvlan_notifier_block);
1855
1856         err = macvlan_link_register(&macvlan_link_ops);
1857         if (err < 0)
1858                 goto err1;
1859         return 0;
1860 err1:
1861         unregister_netdevice_notifier(&macvlan_notifier_block);
1862         return err;
1863 }
1864
1865 static void __exit macvlan_cleanup_module(void)
1866 {
1867         rtnl_link_unregister(&macvlan_link_ops);
1868         unregister_netdevice_notifier(&macvlan_notifier_block);
1869 }
1870
1871 module_init(macvlan_init_module);
1872 module_exit(macvlan_cleanup_module);
1873
1874 MODULE_LICENSE("GPL");
1875 MODULE_AUTHOR("Patrick McHardy <[email protected]>");
1876 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1877 MODULE_ALIAS_RTNL_LINK("macvlan");