drivers/net/macvlan.c

   1 /*
   2  * Copyright (c) 2007 Patrick McHardy <kaber@trash.net>
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation; either version 2 of
   7  * the License, or (at your option) any later version.
   8  *
   9  * The code this is based on carried the following copyright notice:
  10  * ---
  11  * (C) Copyright 2001-2006
  12  * Alex Zeffertt, Cambridge Broadband Ltd, ajz@cambridgebroadband.com
  13  * Re-worked by Ben Greear <greearb@candelatech.com>
  14  * ---
  15  */
  16 #include <linux/kernel.h>
  17 #include <linux/types.h>
  18 #include <linux/module.h>
  19 #include <linux/init.h>
  20 #include <linux/errno.h>
  21 #include <linux/slab.h>
  22 #include <linux/string.h>
  23 #include <linux/rculist.h>
  24 #include <linux/notifier.h>
  25 #include <linux/netdevice.h>
  26 #include <linux/etherdevice.h>
  27 #include <linux/ethtool.h>
  28 #include <linux/if_arp.h>
  29 #include <linux/if_vlan.h>
  30 #include <linux/if_link.h>
  31 #include <linux/if_macvlan.h>
  32 #include <linux/hash.h>
  33 #include <net/rtnetlink.h>
  34 #include <net/xfrm.h>
  35
  36 #define MACVLAN_HASH_SIZE       (1 << BITS_PER_BYTE)
  37
  38 struct macvlan_port {
  39         struct net_device       *dev;
  40         struct hlist_head       vlan_hash[MACVLAN_HASH_SIZE];
  41         struct list_head        vlans;
  42         struct rcu_head         rcu;
  43         bool                    passthru;
  44         int                     count;
  45 };
  46
  47 static void macvlan_port_destroy(struct net_device *dev);
  48
  49 static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev)
  50 {
  51         return rcu_dereference(dev->rx_handler_data);
  52 }
  53
  54 static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev)
  55 {
  56         return rtnl_dereference(dev->rx_handler_data);
  57 }
  58
  59 #define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT)
  60
  61 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
  62                                                const unsigned char *addr)
  63 {
  64         struct macvlan_dev *vlan;
  65
  66         hlist_for_each_entry_rcu(vlan, &port->vlan_hash[addr[5]], hlist) {
  67                 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr))
  68                         return vlan;
  69         }
  70         return NULL;
  71 }
  72
  73 static void macvlan_hash_add(struct macvlan_dev *vlan)
  74 {
  75         struct macvlan_port *port = vlan->port;
  76         const unsigned char *addr = vlan->dev->dev_addr;
  77
  78         hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]);
  79 }
  80
  81 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
  82 {
  83         hlist_del_rcu(&vlan->hlist);
  84         if (sync)
  85                 synchronize_rcu();
  86 }
  87
  88 static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
  89                                         const unsigned char *addr)
  90 {
  91         macvlan_hash_del(vlan, true);
  92         /* Now that we are unhashed it is safe to change the device
  93          * address without confusing packet delivery.
  94          */
  95         memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
  96         macvlan_hash_add(vlan);
  97 }
  98
  99 static int macvlan_addr_busy(const struct macvlan_port *port,
 100                                 const unsigned char *addr)
 101 {
 102         /* Test to see if the specified multicast address is
 103          * currently in use by the underlying device or
 104          * another macvlan.
 105          */
 106         if (ether_addr_equal_64bits(port->dev->dev_addr, addr))
 107                 return 1;
 108
 109         if (macvlan_hash_lookup(port, addr))
 110                 return 1;
 111
 112         return 0;
 113 }
 114
 115
 116 static int macvlan_broadcast_one(struct sk_buff *skb,
 117                                  const struct macvlan_dev *vlan,
 118                                  const struct ethhdr *eth, bool local)
 119 {
 120         struct net_device *dev = vlan->dev;
 121         if (!skb)
 122                 return NET_RX_DROP;
 123
 124         if (local)
 125                 return vlan->forward(dev, skb);
 126
 127         skb->dev = dev;
 128         if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
 129                 skb->pkt_type = PACKET_BROADCAST;
 130         else
 131                 skb->pkt_type = PACKET_MULTICAST;
 132
 133         return vlan->receive(skb);
 134 }
 135
 136 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
 137 {
 138         return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT);
 139 }
 140
 141
 142 static unsigned int mc_hash(const struct macvlan_dev *vlan,
 143                             const unsigned char *addr)
 144 {
 145         u32 val = __get_unaligned_cpu32(addr + 2);
 146
 147         val ^= macvlan_hash_mix(vlan);
 148         return hash_32(val, MACVLAN_MC_FILTER_BITS);
 149 }
 150
 151 static void macvlan_broadcast(struct sk_buff *skb,
 152                               const struct macvlan_port *port,
 153                               struct net_device *src,
 154                               enum macvlan_mode mode)
 155 {
 156         const struct ethhdr *eth = eth_hdr(skb);
 157         const struct macvlan_dev *vlan;
 158         struct sk_buff *nskb;
 159         unsigned int i;
 160         int err;
 161         unsigned int hash;
 162
 163         if (skb->protocol == htons(ETH_P_PAUSE))
 164                 return;
 165
 166         for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
 167                 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) {
 168                         if (vlan->dev == src || !(vlan->mode & mode))
 169                                 continue;
 170
 171                         hash = mc_hash(vlan, eth->h_dest);
 172                         if (!test_bit(hash, vlan->mc_filter))
 173                                 continue;
 174                         nskb = skb_clone(skb, GFP_ATOMIC);
 175                         err = macvlan_broadcast_one(nskb, vlan, eth,
 176                                          mode == MACVLAN_MODE_BRIDGE);
 177                         macvlan_count_rx(vlan, skb->len + ETH_HLEN,
 178                                          err == NET_RX_SUCCESS, 1);
 179                 }
 180         }
 181 }
 182
 183 /* called under rcu_read_lock() from netif_receive_skb */
 184 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
 185 {
 186         struct macvlan_port *port;
 187         struct sk_buff *skb = *pskb;
 188         const struct ethhdr *eth = eth_hdr(skb);
 189         const struct macvlan_dev *vlan;
 190         const struct macvlan_dev *src;
 191         struct net_device *dev;
 192         unsigned int len = 0;
 193         int ret = NET_RX_DROP;
 194
 195         port = macvlan_port_get_rcu(skb->dev);
 196         if (is_multicast_ether_addr(eth->h_dest)) {
 197                 skb = ip_check_defrag(skb, IP_DEFRAG_MACVLAN);
 198                 if (!skb)
 199                         return RX_HANDLER_CONSUMED;
 200                 eth = eth_hdr(skb);
 201                 src = macvlan_hash_lookup(port, eth->h_source);
 202                 if (!src)
 203                         /* frame comes from an external address */
 204                         macvlan_broadcast(skb, port, NULL,
 205                                           MACVLAN_MODE_PRIVATE |
 206                                           MACVLAN_MODE_VEPA    |
 207                                           MACVLAN_MODE_PASSTHRU|
 208                                           MACVLAN_MODE_BRIDGE);
 209                 else if (src->mode == MACVLAN_MODE_VEPA)
 210                         /* flood to everyone except source */
 211                         macvlan_broadcast(skb, port, src->dev,
 212                                           MACVLAN_MODE_VEPA |
 213                                           MACVLAN_MODE_BRIDGE);
 214                 else if (src->mode == MACVLAN_MODE_BRIDGE)
 215                         /*
 216                          * flood only to VEPA ports, bridge ports
 217                          * already saw the frame on the way out.
 218                          */
 219                         macvlan_broadcast(skb, port, src->dev,
 220                                           MACVLAN_MODE_VEPA);
 221                 else {
 222                         /* forward to original port. */
 223                         vlan = src;
 224                         ret = macvlan_broadcast_one(skb, vlan, eth, 0);
 225                         goto out;
 226                 }
 227
 228                 return RX_HANDLER_PASS;
 229         }
 230
 231         if (port->passthru)
 232                 vlan = list_first_entry(&port->vlans, struct macvlan_dev, list);
 233         else
 234                 vlan = macvlan_hash_lookup(port, eth->h_dest);
 235         if (vlan == NULL)
 236                 return RX_HANDLER_PASS;
 237
 238         dev = vlan->dev;
 239         if (unlikely(!(dev->flags & IFF_UP))) {
 240                 kfree_skb(skb);
 241                 return RX_HANDLER_CONSUMED;
 242         }
 243         len = skb->len + ETH_HLEN;
 244         skb = skb_share_check(skb, GFP_ATOMIC);
 245         if (!skb)
 246                 goto out;
 247
 248         skb->dev = dev;
 249         skb->pkt_type = PACKET_HOST;
 250
 251         ret = vlan->receive(skb);
 252
 253 out:
 254         macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0);
 255         return RX_HANDLER_CONSUMED;
 256 }
 257
 258 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
 259 {
 260         const struct macvlan_dev *vlan = netdev_priv(dev);
 261         const struct macvlan_port *port = vlan->port;
 262         const struct macvlan_dev *dest;
 263         __u8 ip_summed = skb->ip_summed;
 264
 265         if (vlan->mode == MACVLAN_MODE_BRIDGE) {
 266                 const struct ethhdr *eth = (void *)skb->data;
 267                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 268
 269                 /* send to other bridge ports directly */
 270                 if (is_multicast_ether_addr(eth->h_dest)) {
 271                         macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
 272                         goto xmit_world;
 273                 }
 274
 275                 dest = macvlan_hash_lookup(port, eth->h_dest);
 276                 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
 277                         /* send to lowerdev first for its network taps */
 278                         dev_forward_skb(vlan->lowerdev, skb);
 279
 280                         return NET_XMIT_SUCCESS;
 281                 }
 282         }
 283
 284 xmit_world:
 285         skb->ip_summed = ip_summed;
 286         skb->dev = vlan->lowerdev;
 287         return dev_queue_xmit(skb);
 288 }
 289
 290 netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
 291                                struct net_device *dev)
 292 {
 293         unsigned int len = skb->len;
 294         int ret;
 295         const struct macvlan_dev *vlan = netdev_priv(dev);
 296
 297         ret = macvlan_queue_xmit(skb, dev);
 298         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 299                 struct macvlan_pcpu_stats *pcpu_stats;
 300
 301                 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
 302                 u64_stats_update_begin(&pcpu_stats->syncp);
 303                 pcpu_stats->tx_packets++;
 304                 pcpu_stats->tx_bytes += len;
 305                 u64_stats_update_end(&pcpu_stats->syncp);
 306         } else {
 307                 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
 308         }
 309         return ret;
 310 }
 311 EXPORT_SYMBOL_GPL(macvlan_start_xmit);
 312
 313 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
 314                                unsigned short type, const void *daddr,
 315                                const void *saddr, unsigned len)
 316 {
 317         const struct macvlan_dev *vlan = netdev_priv(dev);
 318         struct net_device *lowerdev = vlan->lowerdev;
 319
 320         return dev_hard_header(skb, lowerdev, type, daddr,
 321                                saddr ? : dev->dev_addr, len);
 322 }
 323
 324 static const struct header_ops macvlan_hard_header_ops = {
 325         .create         = macvlan_hard_header,
 326         .rebuild        = eth_rebuild_header,
 327         .parse          = eth_header_parse,
 328         .cache          = eth_header_cache,
 329         .cache_update   = eth_header_cache_update,
 330 };
 331
 332 static int macvlan_open(struct net_device *dev)
 333 {
 334         struct macvlan_dev *vlan = netdev_priv(dev);
 335         struct net_device *lowerdev = vlan->lowerdev;
 336         int err;
 337
 338         if (vlan->port->passthru) {
 339                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
 340                         dev_set_promiscuity(lowerdev, 1);
 341                 goto hash_add;
 342         }
 343
 344         err = -EBUSY;
 345         if (macvlan_addr_busy(vlan->port, dev->dev_addr))
 346                 goto out;
 347
 348         err = dev_uc_add(lowerdev, dev->dev_addr);
 349         if (err < 0)
 350                 goto out;
 351         if (dev->flags & IFF_ALLMULTI) {
 352                 err = dev_set_allmulti(lowerdev, 1);
 353                 if (err < 0)
 354                         goto del_unicast;
 355         }
 356
 357 hash_add:
 358         macvlan_hash_add(vlan);
 359         return 0;
 360
 361 del_unicast:
 362         dev_uc_del(lowerdev, dev->dev_addr);
 363 out:
 364         return err;
 365 }
 366
 367 static int macvlan_stop(struct net_device *dev)
 368 {
 369         struct macvlan_dev *vlan = netdev_priv(dev);
 370         struct net_device *lowerdev = vlan->lowerdev;
 371
 372         dev_uc_unsync(lowerdev, dev);
 373         dev_mc_unsync(lowerdev, dev);
 374
 375         if (vlan->port->passthru) {
 376                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
 377                         dev_set_promiscuity(lowerdev, -1);
 378                 goto hash_del;
 379         }
 380
 381         if (dev->flags & IFF_ALLMULTI)
 382                 dev_set_allmulti(lowerdev, -1);
 383
 384         dev_uc_del(lowerdev, dev->dev_addr);
 385
 386 hash_del:
 387         macvlan_hash_del(vlan, !dev->dismantle);
 388         return 0;
 389 }
 390
 391 static int macvlan_set_mac_address(struct net_device *dev, void *p)
 392 {
 393         struct macvlan_dev *vlan = netdev_priv(dev);
 394         struct net_device *lowerdev = vlan->lowerdev;
 395         struct sockaddr *addr = p;
 396         int err;
 397
 398         if (!is_valid_ether_addr(addr->sa_data))
 399                 return -EADDRNOTAVAIL;
 400
 401         if (!(dev->flags & IFF_UP)) {
 402                 /* Just copy in the new address */
 403                 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 404         } else {
 405                 /* Rehash and update the device filters */
 406                 if (macvlan_addr_busy(vlan->port, addr->sa_data))
 407                         return -EBUSY;
 408
 409                 err = dev_uc_add(lowerdev, addr->sa_data);
 410                 if (err)
 411                         return err;
 412
 413                 dev_uc_del(lowerdev, dev->dev_addr);
 414
 415                 macvlan_hash_change_addr(vlan, addr->sa_data);
 416         }
 417         return 0;
 418 }
 419
 420 static void macvlan_change_rx_flags(struct net_device *dev, int change)
 421 {
 422         struct macvlan_dev *vlan = netdev_priv(dev);
 423         struct net_device *lowerdev = vlan->lowerdev;
 424
 425         if (change & IFF_ALLMULTI)
 426                 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 427 }
 428
 429 static void macvlan_set_mac_lists(struct net_device *dev)
 430 {
 431         struct macvlan_dev *vlan = netdev_priv(dev);
 432
 433         if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
 434                 bitmap_fill(vlan->mc_filter, MACVLAN_MC_FILTER_SZ);
 435         } else {
 436                 struct netdev_hw_addr *ha;
 437                 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
 438
 439                 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
 440                 netdev_for_each_mc_addr(ha, dev) {
 441                         __set_bit(mc_hash(vlan, ha->addr), filter);
 442                 }
 443
 444                 __set_bit(mc_hash(vlan, dev->broadcast), filter);
 445
 446                 bitmap_copy(vlan->mc_filter, filter, MACVLAN_MC_FILTER_SZ);
 447         }
 448         dev_uc_sync(vlan->lowerdev, dev);
 449         dev_mc_sync(vlan->lowerdev, dev);
 450 }
 451
 452 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
 453 {
 454         struct macvlan_dev *vlan = netdev_priv(dev);
 455
 456         if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
 457                 return -EINVAL;
 458         dev->mtu = new_mtu;
 459         return 0;
 460 }
 461
 462 /*
 463  * macvlan network devices have devices nesting below it and are a special
 464  * "super class" of normal network devices; split their locks off into a
 465  * separate class since they always nest.
 466  */
 467 static struct lock_class_key macvlan_netdev_xmit_lock_key;
 468 static struct lock_class_key macvlan_netdev_addr_lock_key;
 469
 470 #define MACVLAN_FEATURES \
 471         (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
 472          NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
 473          NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
 474          NETIF_F_HW_VLAN_FILTER)
 475
 476 #define MACVLAN_STATE_MASK \
 477         ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
 478
 479 static void macvlan_set_lockdep_class_one(struct net_device *dev,
 480                                           struct netdev_queue *txq,
 481                                           void *_unused)
 482 {
 483         lockdep_set_class(&txq->_xmit_lock,
 484                           &macvlan_netdev_xmit_lock_key);
 485 }
 486
 487 static void macvlan_set_lockdep_class(struct net_device *dev)
 488 {
 489         lockdep_set_class(&dev->addr_list_lock,
 490                           &macvlan_netdev_addr_lock_key);
 491         netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
 492 }
 493
 494 static int macvlan_init(struct net_device *dev)
 495 {
 496         struct macvlan_dev *vlan = netdev_priv(dev);
 497         const struct net_device *lowerdev = vlan->lowerdev;
 498
 499         dev->state              = (dev->state & ~MACVLAN_STATE_MASK) |
 500                                   (lowerdev->state & MACVLAN_STATE_MASK);
 501         dev->features           = lowerdev->features & MACVLAN_FEATURES;
 502         dev->features           |= NETIF_F_LLTX;
 503         dev->gso_max_size       = lowerdev->gso_max_size;
 504         dev->iflink             = lowerdev->ifindex;
 505         dev->hard_header_len    = lowerdev->hard_header_len;
 506
 507         macvlan_set_lockdep_class(dev);
 508
 509         vlan->pcpu_stats = alloc_percpu(struct macvlan_pcpu_stats);
 510         if (!vlan->pcpu_stats)
 511                 return -ENOMEM;
 512
 513         return 0;
 514 }
 515
 516 static void macvlan_uninit(struct net_device *dev)
 517 {
 518         struct macvlan_dev *vlan = netdev_priv(dev);
 519         struct macvlan_port *port = vlan->port;
 520
 521         free_percpu(vlan->pcpu_stats);
 522
 523         port->count -= 1;
 524         if (!port->count)
 525                 macvlan_port_destroy(port->dev);
 526 }
 527
 528 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
 529                                                          struct rtnl_link_stats64 *stats)
 530 {
 531         struct macvlan_dev *vlan = netdev_priv(dev);
 532
 533         if (vlan->pcpu_stats) {
 534                 struct macvlan_pcpu_stats *p;
 535                 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
 536                 u32 rx_errors = 0, tx_dropped = 0;
 537                 unsigned int start;
 538                 int i;
 539
 540                 for_each_possible_cpu(i) {
 541                         p = per_cpu_ptr(vlan->pcpu_stats, i);
 542                         do {
 543                                 start = u64_stats_fetch_begin_bh(&p->syncp);
 544                                 rx_packets      = p->rx_packets;
 545                                 rx_bytes        = p->rx_bytes;
 546                                 rx_multicast    = p->rx_multicast;
 547                                 tx_packets      = p->tx_packets;
 548                                 tx_bytes        = p->tx_bytes;
 549                         } while (u64_stats_fetch_retry_bh(&p->syncp, start));
 550
 551                         stats->rx_packets       += rx_packets;
 552                         stats->rx_bytes         += rx_bytes;
 553                         stats->multicast        += rx_multicast;
 554                         stats->tx_packets       += tx_packets;
 555                         stats->tx_bytes         += tx_bytes;
 556                         /* rx_errors & tx_dropped are u32, updated
 557                          * without syncp protection.
 558                          */
 559                         rx_errors       += p->rx_errors;
 560                         tx_dropped      += p->tx_dropped;
 561                 }
 562                 stats->rx_errors        = rx_errors;
 563                 stats->rx_dropped       = rx_errors;
 564                 stats->tx_dropped       = tx_dropped;
 565         }
 566         return stats;
 567 }
 568
 569 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
 570                                     unsigned short vid)
 571 {
 572         struct macvlan_dev *vlan = netdev_priv(dev);
 573         struct net_device *lowerdev = vlan->lowerdev;
 574
 575         return vlan_vid_add(lowerdev, vid);
 576 }
 577
 578 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
 579                                      unsigned short vid)
 580 {
 581         struct macvlan_dev *vlan = netdev_priv(dev);
 582         struct net_device *lowerdev = vlan->lowerdev;
 583
 584         vlan_vid_del(lowerdev, vid);
 585         return 0;
 586 }
 587
 588 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 589                            struct net_device *dev,
 590                            const unsigned char *addr,
 591                            u16 flags)
 592 {
 593         struct macvlan_dev *vlan = netdev_priv(dev);
 594         int err = -EINVAL;
 595
 596         if (!vlan->port->passthru)
 597                 return -EOPNOTSUPP;
 598
 599         if (is_unicast_ether_addr(addr))
 600                 err = dev_uc_add_excl(dev, addr);
 601         else if (is_multicast_ether_addr(addr))
 602                 err = dev_mc_add_excl(dev, addr);
 603
 604         return err;
 605 }
 606
 607 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
 608                            struct net_device *dev,
 609                            const unsigned char *addr)
 610 {
 611         struct macvlan_dev *vlan = netdev_priv(dev);
 612         int err = -EINVAL;
 613
 614         if (!vlan->port->passthru)
 615                 return -EOPNOTSUPP;
 616
 617         if (is_unicast_ether_addr(addr))
 618                 err = dev_uc_del(dev, addr);
 619         else if (is_multicast_ether_addr(addr))
 620                 err = dev_mc_del(dev, addr);
 621
 622         return err;
 623 }
 624
 625 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
 626                                         struct ethtool_drvinfo *drvinfo)
 627 {
 628         strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
 629         strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
 630 }
 631
 632 static int macvlan_ethtool_get_settings(struct net_device *dev,
 633                                         struct ethtool_cmd *cmd)
 634 {
 635         const struct macvlan_dev *vlan = netdev_priv(dev);
 636
 637         return __ethtool_get_settings(vlan->lowerdev, cmd);
 638 }
 639
 640 static const struct ethtool_ops macvlan_ethtool_ops = {
 641         .get_link               = ethtool_op_get_link,
 642         .get_settings           = macvlan_ethtool_get_settings,
 643         .get_drvinfo            = macvlan_ethtool_get_drvinfo,
 644 };
 645
 646 static const struct net_device_ops macvlan_netdev_ops = {
 647         .ndo_init               = macvlan_init,
 648         .ndo_uninit             = macvlan_uninit,
 649         .ndo_open               = macvlan_open,
 650         .ndo_stop               = macvlan_stop,
 651         .ndo_start_xmit         = macvlan_start_xmit,
 652         .ndo_change_mtu         = macvlan_change_mtu,
 653         .ndo_change_rx_flags    = macvlan_change_rx_flags,
 654         .ndo_set_mac_address    = macvlan_set_mac_address,
 655         .ndo_set_rx_mode        = macvlan_set_mac_lists,
 656         .ndo_get_stats64        = macvlan_dev_get_stats64,
 657         .ndo_validate_addr      = eth_validate_addr,
 658         .ndo_vlan_rx_add_vid    = macvlan_vlan_rx_add_vid,
 659         .ndo_vlan_rx_kill_vid   = macvlan_vlan_rx_kill_vid,
 660         .ndo_fdb_add            = macvlan_fdb_add,
 661         .ndo_fdb_del            = macvlan_fdb_del,
 662         .ndo_fdb_dump           = ndo_dflt_fdb_dump,
 663 };
 664
 665 void macvlan_common_setup(struct net_device *dev)
 666 {
 667         ether_setup(dev);
 668
 669         dev->priv_flags        &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
 670         dev->priv_flags        |= IFF_UNICAST_FLT;
 671         dev->netdev_ops         = &macvlan_netdev_ops;
 672         dev->destructor         = free_netdev;
 673         dev->header_ops         = &macvlan_hard_header_ops,
 674         dev->ethtool_ops        = &macvlan_ethtool_ops;
 675 }
 676 EXPORT_SYMBOL_GPL(macvlan_common_setup);
 677
 678 static void macvlan_setup(struct net_device *dev)
 679 {
 680         macvlan_common_setup(dev);
 681         dev->tx_queue_len       = 0;
 682 }
 683
 684 static int macvlan_port_create(struct net_device *dev)
 685 {
 686         struct macvlan_port *port;
 687         unsigned int i;
 688         int err;
 689
 690         if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
 691                 return -EINVAL;
 692
 693         port = kzalloc(sizeof(*port), GFP_KERNEL);
 694         if (port == NULL)
 695                 return -ENOMEM;
 696
 697         port->passthru = false;
 698         port->dev = dev;
 699         INIT_LIST_HEAD(&port->vlans);
 700         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
 701                 INIT_HLIST_HEAD(&port->vlan_hash[i]);
 702
 703         err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
 704         if (err)
 705                 kfree(port);
 706         else
 707                 dev->priv_flags |= IFF_MACVLAN_PORT;
 708         return err;
 709 }
 710
 711 static void macvlan_port_destroy(struct net_device *dev)
 712 {
 713         struct macvlan_port *port = macvlan_port_get_rtnl(dev);
 714
 715         dev->priv_flags &= ~IFF_MACVLAN_PORT;
 716         netdev_rx_handler_unregister(dev);
 717         kfree_rcu(port, rcu);
 718 }
 719
 720 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
 721 {
 722         if (tb[IFLA_ADDRESS]) {
 723                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
 724                         return -EINVAL;
 725                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
 726                         return -EADDRNOTAVAIL;
 727         }
 728
 729         if (data && data[IFLA_MACVLAN_MODE]) {
 730                 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
 731                 case MACVLAN_MODE_PRIVATE:
 732                 case MACVLAN_MODE_VEPA:
 733                 case MACVLAN_MODE_BRIDGE:
 734                 case MACVLAN_MODE_PASSTHRU:
 735                         break;
 736                 default:
 737                         return -EINVAL;
 738                 }
 739         }
 740         return 0;
 741 }
 742
 743 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
 744                            struct nlattr *tb[], struct nlattr *data[],
 745                            int (*receive)(struct sk_buff *skb),
 746                            int (*forward)(struct net_device *dev,
 747                                           struct sk_buff *skb))
 748 {
 749         struct macvlan_dev *vlan = netdev_priv(dev);
 750         struct macvlan_port *port;
 751         struct net_device *lowerdev;
 752         int err;
 753
 754         if (!tb[IFLA_LINK])
 755                 return -EINVAL;
 756
 757         lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
 758         if (lowerdev == NULL)
 759                 return -ENODEV;
 760
 761         /* When creating macvlans on top of other macvlans - use
 762          * the real device as the lowerdev.
 763          */
 764         if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) {
 765                 struct macvlan_dev *lowervlan = netdev_priv(lowerdev);
 766                 lowerdev = lowervlan->lowerdev;
 767         }
 768
 769         if (!tb[IFLA_MTU])
 770                 dev->mtu = lowerdev->mtu;
 771         else if (dev->mtu > lowerdev->mtu)
 772                 return -EINVAL;
 773
 774         if (!tb[IFLA_ADDRESS])
 775                 eth_hw_addr_random(dev);
 776
 777         if (!macvlan_port_exists(lowerdev)) {
 778                 err = macvlan_port_create(lowerdev);
 779                 if (err < 0)
 780                         return err;
 781         }
 782         port = macvlan_port_get_rtnl(lowerdev);
 783
 784         /* Only 1 macvlan device can be created in passthru mode */
 785         if (port->passthru)
 786                 return -EINVAL;
 787
 788         vlan->lowerdev = lowerdev;
 789         vlan->dev      = dev;
 790         vlan->port     = port;
 791         vlan->receive  = receive;
 792         vlan->forward  = forward;
 793
 794         vlan->mode     = MACVLAN_MODE_VEPA;
 795         if (data && data[IFLA_MACVLAN_MODE])
 796                 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
 797
 798         if (data && data[IFLA_MACVLAN_FLAGS])
 799                 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
 800
 801         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
 802                 if (port->count)
 803                         return -EINVAL;
 804                 port->passthru = true;
 805                 memcpy(dev->dev_addr, lowerdev->dev_addr, ETH_ALEN);
 806         }
 807
 808         err = netdev_upper_dev_link(lowerdev, dev);
 809         if (err)
 810                 goto destroy_port;
 811
 812         port->count += 1;
 813         err = register_netdevice(dev);
 814         if (err < 0)
 815                 goto upper_dev_unlink;
 816
 817         list_add_tail(&vlan->list, &port->vlans);
 818         netif_stacked_transfer_operstate(lowerdev, dev);
 819
 820         return 0;
 821
 822 upper_dev_unlink:
 823         netdev_upper_dev_unlink(lowerdev, dev);
 824 destroy_port:
 825         port->count -= 1;
 826         if (!port->count)
 827                 macvlan_port_destroy(lowerdev);
 828
 829         return err;
 830 }
 831 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
 832
 833 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
 834                            struct nlattr *tb[], struct nlattr *data[])
 835 {
 836         return macvlan_common_newlink(src_net, dev, tb, data,
 837                                       netif_rx,
 838                                       dev_forward_skb);
 839 }
 840
 841 void macvlan_dellink(struct net_device *dev, struct list_head *head)
 842 {
 843         struct macvlan_dev *vlan = netdev_priv(dev);
 844
 845         list_del(&vlan->list);
 846         unregister_netdevice_queue(dev, head);
 847         netdev_upper_dev_unlink(vlan->lowerdev, dev);
 848 }
 849 EXPORT_SYMBOL_GPL(macvlan_dellink);
 850
 851 static int macvlan_changelink(struct net_device *dev,
 852                 struct nlattr *tb[], struct nlattr *data[])
 853 {
 854         struct macvlan_dev *vlan = netdev_priv(dev);
 855         if (data && data[IFLA_MACVLAN_MODE])
 856                 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
 857         if (data && data[IFLA_MACVLAN_FLAGS]) {
 858                 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
 859                 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
 860
 861                 if (promisc && (flags & MACVLAN_FLAG_NOPROMISC))
 862                         dev_set_promiscuity(vlan->lowerdev, -1);
 863                 else if (promisc && !(flags & MACVLAN_FLAG_NOPROMISC))
 864                         dev_set_promiscuity(vlan->lowerdev, 1);
 865                 vlan->flags = flags;
 866         }
 867         return 0;
 868 }
 869
 870 static size_t macvlan_get_size(const struct net_device *dev)
 871 {
 872         return (0
 873                 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
 874                 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
 875                 );
 876 }
 877
 878 static int macvlan_fill_info(struct sk_buff *skb,
 879                                 const struct net_device *dev)
 880 {
 881         struct macvlan_dev *vlan = netdev_priv(dev);
 882
 883         if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
 884                 goto nla_put_failure;
 885         if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
 886                 goto nla_put_failure;
 887         return 0;
 888
 889 nla_put_failure:
 890         return -EMSGSIZE;
 891 }
 892
 893 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
 894         [IFLA_MACVLAN_MODE]  = { .type = NLA_U32 },
 895         [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
 896 };
 897
 898 int macvlan_link_register(struct rtnl_link_ops *ops)
 899 {
 900         /* common fields */
 901         ops->priv_size          = sizeof(struct macvlan_dev);
 902         ops->validate           = macvlan_validate;
 903         ops->maxtype            = IFLA_MACVLAN_MAX;
 904         ops->policy             = macvlan_policy;
 905         ops->changelink         = macvlan_changelink;
 906         ops->get_size           = macvlan_get_size;
 907         ops->fill_info          = macvlan_fill_info;
 908
 909         return rtnl_link_register(ops);
 910 };
 911 EXPORT_SYMBOL_GPL(macvlan_link_register);
 912
 913 static struct rtnl_link_ops macvlan_link_ops = {
 914         .kind           = "macvlan",
 915         .setup          = macvlan_setup,
 916         .newlink        = macvlan_newlink,
 917         .dellink        = macvlan_dellink,
 918 };
 919
 920 static int macvlan_device_event(struct notifier_block *unused,
 921                                 unsigned long event, void *ptr)
 922 {
 923         struct net_device *dev = ptr;
 924         struct macvlan_dev *vlan, *next;
 925         struct macvlan_port *port;
 926         LIST_HEAD(list_kill);
 927
 928         if (!macvlan_port_exists(dev))
 929                 return NOTIFY_DONE;
 930
 931         port = macvlan_port_get_rtnl(dev);
 932
 933         switch (event) {
 934         case NETDEV_CHANGE:
 935                 list_for_each_entry(vlan, &port->vlans, list)
 936                         netif_stacked_transfer_operstate(vlan->lowerdev,
 937                                                          vlan->dev);
 938                 break;
 939         case NETDEV_FEAT_CHANGE:
 940                 list_for_each_entry(vlan, &port->vlans, list) {
 941                         vlan->dev->features = dev->features & MACVLAN_FEATURES;
 942                         vlan->dev->gso_max_size = dev->gso_max_size;
 943                         netdev_features_change(vlan->dev);
 944                 }
 945                 break;
 946         case NETDEV_UNREGISTER:
 947                 /* twiddle thumbs on netns device moves */
 948                 if (dev->reg_state != NETREG_UNREGISTERING)
 949                         break;
 950
 951                 list_for_each_entry_safe(vlan, next, &port->vlans, list)
 952                         vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
 953                 unregister_netdevice_many(&list_kill);
 954                 list_del(&list_kill);
 955                 break;
 956         case NETDEV_PRE_TYPE_CHANGE:
 957                 /* Forbid underlaying device to change its type. */
 958                 return NOTIFY_BAD;
 959         }
 960         return NOTIFY_DONE;
 961 }
 962
 963 static struct notifier_block macvlan_notifier_block __read_mostly = {
 964         .notifier_call  = macvlan_device_event,
 965 };
 966
 967 static int __init macvlan_init_module(void)
 968 {
 969         int err;
 970
 971         register_netdevice_notifier(&macvlan_notifier_block);
 972
 973         err = macvlan_link_register(&macvlan_link_ops);
 974         if (err < 0)
 975                 goto err1;
 976         return 0;
 977 err1:
 978         unregister_netdevice_notifier(&macvlan_notifier_block);
 979         return err;
 980 }
 981
 982 static void __exit macvlan_cleanup_module(void)
 983 {
 984         rtnl_link_unregister(&macvlan_link_ops);
 985         unregister_netdevice_notifier(&macvlan_notifier_block);
 986 }
 987
 988 module_init(macvlan_init_module);
 989 module_exit(macvlan_cleanup_module);
 990
 991 MODULE_LICENSE("GPL");
 992 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
 993 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
 994 MODULE_ALIAS_RTNL_LINK("macvlan");