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_link.h>
  30 #include <linux/if_macvlan.h>
  31 #include <net/rtnetlink.h>
  32 #include <net/xfrm.h>
  33
  34 #define MACVLAN_HASH_SIZE       (1 << BITS_PER_BYTE)
  35
  36 struct macvlan_port {
  37         struct net_device       *dev;
  38         struct hlist_head       vlan_hash[MACVLAN_HASH_SIZE];
  39         struct list_head        vlans;
  40         struct rcu_head         rcu;
  41 };
  42
  43 #define macvlan_port_get_rcu(dev) \
  44         ((struct macvlan_port *) rcu_dereference(dev->rx_handler_data))
  45 #define macvlan_port_get(dev) ((struct macvlan_port *) dev->rx_handler_data)
  46 #define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT)
  47
  48 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
  49                                                const unsigned char *addr)
  50 {
  51         struct macvlan_dev *vlan;
  52         struct hlist_node *n;
  53
  54         hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[addr[5]], hlist) {
  55                 if (!compare_ether_addr_64bits(vlan->dev->dev_addr, addr))
  56                         return vlan;
  57         }
  58         return NULL;
  59 }
  60
  61 static void macvlan_hash_add(struct macvlan_dev *vlan)
  62 {
  63         struct macvlan_port *port = vlan->port;
  64         const unsigned char *addr = vlan->dev->dev_addr;
  65
  66         hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]);
  67 }
  68
  69 static void macvlan_hash_del(struct macvlan_dev *vlan)
  70 {
  71         hlist_del_rcu(&vlan->hlist);
  72         synchronize_rcu();
  73 }
  74
  75 static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
  76                                         const unsigned char *addr)
  77 {
  78         macvlan_hash_del(vlan);
  79         /* Now that we are unhashed it is safe to change the device
  80          * address without confusing packet delivery.
  81          */
  82         memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
  83         macvlan_hash_add(vlan);
  84 }
  85
  86 static int macvlan_addr_busy(const struct macvlan_port *port,
  87                                 const unsigned char *addr)
  88 {
  89         /* Test to see if the specified multicast address is
  90          * currently in use by the underlying device or
  91          * another macvlan.
  92          */
  93         if (!compare_ether_addr_64bits(port->dev->dev_addr, addr))
  94                 return 1;
  95
  96         if (macvlan_hash_lookup(port, addr))
  97                 return 1;
  98
  99         return 0;
 100 }
 101
 102
 103 static int macvlan_broadcast_one(struct sk_buff *skb,
 104                                  const struct macvlan_dev *vlan,
 105                                  const struct ethhdr *eth, bool local)
 106 {
 107         struct net_device *dev = vlan->dev;
 108         if (!skb)
 109                 return NET_RX_DROP;
 110
 111         if (local)
 112                 return vlan->forward(dev, skb);
 113
 114         skb->dev = dev;
 115         if (!compare_ether_addr_64bits(eth->h_dest,
 116                                        dev->broadcast))
 117                 skb->pkt_type = PACKET_BROADCAST;
 118         else
 119                 skb->pkt_type = PACKET_MULTICAST;
 120
 121         return vlan->receive(skb);
 122 }
 123
 124 static void macvlan_broadcast(struct sk_buff *skb,
 125                               const struct macvlan_port *port,
 126                               struct net_device *src,
 127                               enum macvlan_mode mode)
 128 {
 129         const struct ethhdr *eth = eth_hdr(skb);
 130         const struct macvlan_dev *vlan;
 131         struct hlist_node *n;
 132         struct sk_buff *nskb;
 133         unsigned int i;
 134         int err;
 135
 136         if (skb->protocol == htons(ETH_P_PAUSE))
 137                 return;
 138
 139         for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
 140                 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[i], hlist) {
 141                         if (vlan->dev == src || !(vlan->mode & mode))
 142                                 continue;
 143
 144                         nskb = skb_clone(skb, GFP_ATOMIC);
 145                         err = macvlan_broadcast_one(nskb, vlan, eth,
 146                                          mode == MACVLAN_MODE_BRIDGE);
 147                         macvlan_count_rx(vlan, skb->len + ETH_HLEN,
 148                                          err == NET_RX_SUCCESS, 1);
 149                 }
 150         }
 151 }
 152
 153 /* called under rcu_read_lock() from netif_receive_skb */
 154 static struct sk_buff *macvlan_handle_frame(struct sk_buff *skb)
 155 {
 156         struct macvlan_port *port;
 157         const struct ethhdr *eth = eth_hdr(skb);
 158         const struct macvlan_dev *vlan;
 159         const struct macvlan_dev *src;
 160         struct net_device *dev;
 161         unsigned int len = 0;
 162         int ret = NET_RX_DROP;
 163
 164         port = macvlan_port_get_rcu(skb->dev);
 165         if (is_multicast_ether_addr(eth->h_dest)) {
 166                 src = macvlan_hash_lookup(port, eth->h_source);
 167                 if (!src)
 168                         /* frame comes from an external address */
 169                         macvlan_broadcast(skb, port, NULL,
 170                                           MACVLAN_MODE_PRIVATE |
 171                                           MACVLAN_MODE_VEPA    |
 172                                           MACVLAN_MODE_BRIDGE);
 173                 else if (src->mode == MACVLAN_MODE_VEPA)
 174                         /* flood to everyone except source */
 175                         macvlan_broadcast(skb, port, src->dev,
 176                                           MACVLAN_MODE_VEPA |
 177                                           MACVLAN_MODE_BRIDGE);
 178                 else if (src->mode == MACVLAN_MODE_BRIDGE)
 179                         /*
 180                          * flood only to VEPA ports, bridge ports
 181                          * already saw the frame on the way out.
 182                          */
 183                         macvlan_broadcast(skb, port, src->dev,
 184                                           MACVLAN_MODE_VEPA);
 185                 return skb;
 186         }
 187
 188         vlan = macvlan_hash_lookup(port, eth->h_dest);
 189         if (vlan == NULL)
 190                 return skb;
 191
 192         dev = vlan->dev;
 193         if (unlikely(!(dev->flags & IFF_UP))) {
 194                 kfree_skb(skb);
 195                 return NULL;
 196         }
 197         len = skb->len + ETH_HLEN;
 198         skb = skb_share_check(skb, GFP_ATOMIC);
 199         if (!skb)
 200                 goto out;
 201
 202         skb->dev = dev;
 203         skb->pkt_type = PACKET_HOST;
 204
 205         ret = vlan->receive(skb);
 206
 207 out:
 208         macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0);
 209         return NULL;
 210 }
 211
 212 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
 213 {
 214         const struct macvlan_dev *vlan = netdev_priv(dev);
 215         const struct macvlan_port *port = vlan->port;
 216         const struct macvlan_dev *dest;
 217
 218         if (vlan->mode == MACVLAN_MODE_BRIDGE) {
 219                 const struct ethhdr *eth = (void *)skb->data;
 220
 221                 /* send to other bridge ports directly */
 222                 if (is_multicast_ether_addr(eth->h_dest)) {
 223                         macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
 224                         goto xmit_world;
 225                 }
 226
 227                 dest = macvlan_hash_lookup(port, eth->h_dest);
 228                 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
 229                         unsigned int length = skb->len + ETH_HLEN;
 230                         int ret = dest->forward(dest->dev, skb);
 231                         macvlan_count_rx(dest, length,
 232                                          ret == NET_RX_SUCCESS, 0);
 233
 234                         return NET_XMIT_SUCCESS;
 235                 }
 236         }
 237
 238 xmit_world:
 239         skb_set_dev(skb, vlan->lowerdev);
 240         return dev_queue_xmit(skb);
 241 }
 242
 243 netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
 244                                struct net_device *dev)
 245 {
 246         int i = skb_get_queue_mapping(skb);
 247         struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
 248         unsigned int len = skb->len;
 249         int ret;
 250
 251         ret = macvlan_queue_xmit(skb, dev);
 252         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 253                 txq->tx_packets++;
 254                 txq->tx_bytes += len;
 255         } else
 256                 txq->tx_dropped++;
 257
 258         return ret;
 259 }
 260 EXPORT_SYMBOL_GPL(macvlan_start_xmit);
 261
 262 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
 263                                unsigned short type, const void *daddr,
 264                                const void *saddr, unsigned len)
 265 {
 266         const struct macvlan_dev *vlan = netdev_priv(dev);
 267         struct net_device *lowerdev = vlan->lowerdev;
 268
 269         return dev_hard_header(skb, lowerdev, type, daddr,
 270                                saddr ? : dev->dev_addr, len);
 271 }
 272
 273 static const struct header_ops macvlan_hard_header_ops = {
 274         .create         = macvlan_hard_header,
 275         .rebuild        = eth_rebuild_header,
 276         .parse          = eth_header_parse,
 277         .cache          = eth_header_cache,
 278         .cache_update   = eth_header_cache_update,
 279 };
 280
 281 static int macvlan_open(struct net_device *dev)
 282 {
 283         struct macvlan_dev *vlan = netdev_priv(dev);
 284         struct net_device *lowerdev = vlan->lowerdev;
 285         int err;
 286
 287         err = -EBUSY;
 288         if (macvlan_addr_busy(vlan->port, dev->dev_addr))
 289                 goto out;
 290
 291         err = dev_uc_add(lowerdev, dev->dev_addr);
 292         if (err < 0)
 293                 goto out;
 294         if (dev->flags & IFF_ALLMULTI) {
 295                 err = dev_set_allmulti(lowerdev, 1);
 296                 if (err < 0)
 297                         goto del_unicast;
 298         }
 299         macvlan_hash_add(vlan);
 300         return 0;
 301
 302 del_unicast:
 303         dev_uc_del(lowerdev, dev->dev_addr);
 304 out:
 305         return err;
 306 }
 307
 308 static int macvlan_stop(struct net_device *dev)
 309 {
 310         struct macvlan_dev *vlan = netdev_priv(dev);
 311         struct net_device *lowerdev = vlan->lowerdev;
 312
 313         dev_mc_unsync(lowerdev, dev);
 314         if (dev->flags & IFF_ALLMULTI)
 315                 dev_set_allmulti(lowerdev, -1);
 316
 317         dev_uc_del(lowerdev, dev->dev_addr);
 318
 319         macvlan_hash_del(vlan);
 320         return 0;
 321 }
 322
 323 static int macvlan_set_mac_address(struct net_device *dev, void *p)
 324 {
 325         struct macvlan_dev *vlan = netdev_priv(dev);
 326         struct net_device *lowerdev = vlan->lowerdev;
 327         struct sockaddr *addr = p;
 328         int err;
 329
 330         if (!is_valid_ether_addr(addr->sa_data))
 331                 return -EADDRNOTAVAIL;
 332
 333         if (!(dev->flags & IFF_UP)) {
 334                 /* Just copy in the new address */
 335                 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 336         } else {
 337                 /* Rehash and update the device filters */
 338                 if (macvlan_addr_busy(vlan->port, addr->sa_data))
 339                         return -EBUSY;
 340
 341                 err = dev_uc_add(lowerdev, addr->sa_data);
 342                 if (err)
 343                         return err;
 344
 345                 dev_uc_del(lowerdev, dev->dev_addr);
 346
 347                 macvlan_hash_change_addr(vlan, addr->sa_data);
 348         }
 349         return 0;
 350 }
 351
 352 static void macvlan_change_rx_flags(struct net_device *dev, int change)
 353 {
 354         struct macvlan_dev *vlan = netdev_priv(dev);
 355         struct net_device *lowerdev = vlan->lowerdev;
 356
 357         if (change & IFF_ALLMULTI)
 358                 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 359 }
 360
 361 static void macvlan_set_multicast_list(struct net_device *dev)
 362 {
 363         struct macvlan_dev *vlan = netdev_priv(dev);
 364
 365         dev_mc_sync(vlan->lowerdev, dev);
 366 }
 367
 368 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
 369 {
 370         struct macvlan_dev *vlan = netdev_priv(dev);
 371
 372         if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
 373                 return -EINVAL;
 374         dev->mtu = new_mtu;
 375         return 0;
 376 }
 377
 378 /*
 379  * macvlan network devices have devices nesting below it and are a special
 380  * "super class" of normal network devices; split their locks off into a
 381  * separate class since they always nest.
 382  */
 383 static struct lock_class_key macvlan_netdev_xmit_lock_key;
 384 static struct lock_class_key macvlan_netdev_addr_lock_key;
 385
 386 #define MACVLAN_FEATURES \
 387         (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
 388          NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
 389          NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO)
 390
 391 #define MACVLAN_STATE_MASK \
 392         ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
 393
 394 static void macvlan_set_lockdep_class_one(struct net_device *dev,
 395                                           struct netdev_queue *txq,
 396                                           void *_unused)
 397 {
 398         lockdep_set_class(&txq->_xmit_lock,
 399                           &macvlan_netdev_xmit_lock_key);
 400 }
 401
 402 static void macvlan_set_lockdep_class(struct net_device *dev)
 403 {
 404         lockdep_set_class(&dev->addr_list_lock,
 405                           &macvlan_netdev_addr_lock_key);
 406         netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
 407 }
 408
 409 static int macvlan_init(struct net_device *dev)
 410 {
 411         struct macvlan_dev *vlan = netdev_priv(dev);
 412         const struct net_device *lowerdev = vlan->lowerdev;
 413
 414         dev->state              = (dev->state & ~MACVLAN_STATE_MASK) |
 415                                   (lowerdev->state & MACVLAN_STATE_MASK);
 416         dev->features           = lowerdev->features & MACVLAN_FEATURES;
 417         dev->gso_max_size       = lowerdev->gso_max_size;
 418         dev->iflink             = lowerdev->ifindex;
 419         dev->hard_header_len    = lowerdev->hard_header_len;
 420
 421         macvlan_set_lockdep_class(dev);
 422
 423         vlan->rx_stats = alloc_percpu(struct macvlan_rx_stats);
 424         if (!vlan->rx_stats)
 425                 return -ENOMEM;
 426
 427         return 0;
 428 }
 429
 430 static void macvlan_uninit(struct net_device *dev)
 431 {
 432         struct macvlan_dev *vlan = netdev_priv(dev);
 433
 434         free_percpu(vlan->rx_stats);
 435 }
 436
 437 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
 438                                                          struct rtnl_link_stats64 *stats)
 439 {
 440         struct macvlan_dev *vlan = netdev_priv(dev);
 441
 442         dev_txq_stats_fold(dev, stats);
 443
 444         if (vlan->rx_stats) {
 445                 struct macvlan_rx_stats *p, accum = {0};
 446                 u64 rx_packets, rx_bytes, rx_multicast;
 447                 unsigned int start;
 448                 int i;
 449
 450                 for_each_possible_cpu(i) {
 451                         p = per_cpu_ptr(vlan->rx_stats, i);
 452                         do {
 453                                 start = u64_stats_fetch_begin_bh(&p->syncp);
 454                                 rx_packets      = p->rx_packets;
 455                                 rx_bytes        = p->rx_bytes;
 456                                 rx_multicast    = p->rx_multicast;
 457                         } while (u64_stats_fetch_retry_bh(&p->syncp, start));
 458                         accum.rx_packets        += rx_packets;
 459                         accum.rx_bytes          += rx_bytes;
 460                         accum.rx_multicast      += rx_multicast;
 461                         /* rx_errors is an ulong, updated without syncp protection */
 462                         accum.rx_errors         += p->rx_errors;
 463                 }
 464                 stats->rx_packets = accum.rx_packets;
 465                 stats->rx_bytes   = accum.rx_bytes;
 466                 stats->rx_errors  = accum.rx_errors;
 467                 stats->rx_dropped = accum.rx_errors;
 468                 stats->multicast  = accum.rx_multicast;
 469         }
 470         return stats;
 471 }
 472
 473 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
 474                                         struct ethtool_drvinfo *drvinfo)
 475 {
 476         snprintf(drvinfo->driver, 32, "macvlan");
 477         snprintf(drvinfo->version, 32, "0.1");
 478 }
 479
 480 static u32 macvlan_ethtool_get_rx_csum(struct net_device *dev)
 481 {
 482         const struct macvlan_dev *vlan = netdev_priv(dev);
 483         return dev_ethtool_get_rx_csum(vlan->lowerdev);
 484 }
 485
 486 static int macvlan_ethtool_get_settings(struct net_device *dev,
 487                                         struct ethtool_cmd *cmd)
 488 {
 489         const struct macvlan_dev *vlan = netdev_priv(dev);
 490         return dev_ethtool_get_settings(vlan->lowerdev, cmd);
 491 }
 492
 493 static u32 macvlan_ethtool_get_flags(struct net_device *dev)
 494 {
 495         const struct macvlan_dev *vlan = netdev_priv(dev);
 496         return dev_ethtool_get_flags(vlan->lowerdev);
 497 }
 498
 499 static const struct ethtool_ops macvlan_ethtool_ops = {
 500         .get_link               = ethtool_op_get_link,
 501         .get_settings           = macvlan_ethtool_get_settings,
 502         .get_rx_csum            = macvlan_ethtool_get_rx_csum,
 503         .get_drvinfo            = macvlan_ethtool_get_drvinfo,
 504         .get_flags              = macvlan_ethtool_get_flags,
 505 };
 506
 507 static const struct net_device_ops macvlan_netdev_ops = {
 508         .ndo_init               = macvlan_init,
 509         .ndo_uninit             = macvlan_uninit,
 510         .ndo_open               = macvlan_open,
 511         .ndo_stop               = macvlan_stop,
 512         .ndo_start_xmit         = macvlan_start_xmit,
 513         .ndo_change_mtu         = macvlan_change_mtu,
 514         .ndo_change_rx_flags    = macvlan_change_rx_flags,
 515         .ndo_set_mac_address    = macvlan_set_mac_address,
 516         .ndo_set_multicast_list = macvlan_set_multicast_list,
 517         .ndo_get_stats64        = macvlan_dev_get_stats64,
 518         .ndo_validate_addr      = eth_validate_addr,
 519 };
 520
 521 void macvlan_common_setup(struct net_device *dev)
 522 {
 523         ether_setup(dev);
 524
 525         dev->priv_flags        &= ~IFF_XMIT_DST_RELEASE;
 526         dev->netdev_ops         = &macvlan_netdev_ops;
 527         dev->destructor         = free_netdev;
 528         dev->header_ops         = &macvlan_hard_header_ops,
 529         dev->ethtool_ops        = &macvlan_ethtool_ops;
 530 }
 531 EXPORT_SYMBOL_GPL(macvlan_common_setup);
 532
 533 static void macvlan_setup(struct net_device *dev)
 534 {
 535         macvlan_common_setup(dev);
 536         dev->tx_queue_len       = 0;
 537 }
 538
 539 static int macvlan_port_create(struct net_device *dev)
 540 {
 541         struct macvlan_port *port;
 542         unsigned int i;
 543         int err;
 544
 545         if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
 546                 return -EINVAL;
 547
 548         port = kzalloc(sizeof(*port), GFP_KERNEL);
 549         if (port == NULL)
 550                 return -ENOMEM;
 551
 552         port->dev = dev;
 553         INIT_LIST_HEAD(&port->vlans);
 554         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
 555                 INIT_HLIST_HEAD(&port->vlan_hash[i]);
 556
 557         err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
 558         if (err)
 559                 kfree(port);
 560
 561         dev->priv_flags |= IFF_MACVLAN_PORT;
 562         return err;
 563 }
 564
 565 static void macvlan_port_rcu_free(struct rcu_head *head)
 566 {
 567         struct macvlan_port *port;
 568
 569         port = container_of(head, struct macvlan_port, rcu);
 570         kfree(port);
 571 }
 572
 573 static void macvlan_port_destroy(struct net_device *dev)
 574 {
 575         struct macvlan_port *port = macvlan_port_get(dev);
 576
 577         dev->priv_flags &= ~IFF_MACVLAN_PORT;
 578         netdev_rx_handler_unregister(dev);
 579         call_rcu(&port->rcu, macvlan_port_rcu_free);
 580 }
 581
 582 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
 583 {
 584         if (tb[IFLA_ADDRESS]) {
 585                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
 586                         return -EINVAL;
 587                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
 588                         return -EADDRNOTAVAIL;
 589         }
 590
 591         if (data && data[IFLA_MACVLAN_MODE]) {
 592                 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
 593                 case MACVLAN_MODE_PRIVATE:
 594                 case MACVLAN_MODE_VEPA:
 595                 case MACVLAN_MODE_BRIDGE:
 596                         break;
 597                 default:
 598                         return -EINVAL;
 599                 }
 600         }
 601         return 0;
 602 }
 603
 604 static int macvlan_get_tx_queues(struct net *net,
 605                                  struct nlattr *tb[],
 606                                  unsigned int *num_tx_queues,
 607                                  unsigned int *real_num_tx_queues)
 608 {
 609         struct net_device *real_dev;
 610
 611         if (!tb[IFLA_LINK])
 612                 return -EINVAL;
 613
 614         real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
 615         if (!real_dev)
 616                 return -ENODEV;
 617
 618         *num_tx_queues      = real_dev->num_tx_queues;
 619         *real_num_tx_queues = real_dev->real_num_tx_queues;
 620         return 0;
 621 }
 622
 623 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
 624                            struct nlattr *tb[], struct nlattr *data[],
 625                            int (*receive)(struct sk_buff *skb),
 626                            int (*forward)(struct net_device *dev,
 627                                           struct sk_buff *skb))
 628 {
 629         struct macvlan_dev *vlan = netdev_priv(dev);
 630         struct macvlan_port *port;
 631         struct net_device *lowerdev;
 632         int err;
 633
 634         if (!tb[IFLA_LINK])
 635                 return -EINVAL;
 636
 637         lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
 638         if (lowerdev == NULL)
 639                 return -ENODEV;
 640
 641         /* When creating macvlans on top of other macvlans - use
 642          * the real device as the lowerdev.
 643          */
 644         if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) {
 645                 struct macvlan_dev *lowervlan = netdev_priv(lowerdev);
 646                 lowerdev = lowervlan->lowerdev;
 647         }
 648
 649         if (!tb[IFLA_MTU])
 650                 dev->mtu = lowerdev->mtu;
 651         else if (dev->mtu > lowerdev->mtu)
 652                 return -EINVAL;
 653
 654         if (!tb[IFLA_ADDRESS])
 655                 random_ether_addr(dev->dev_addr);
 656
 657         if (!macvlan_port_exists(lowerdev)) {
 658                 err = macvlan_port_create(lowerdev);
 659                 if (err < 0)
 660                         return err;
 661         }
 662         port = macvlan_port_get(lowerdev);
 663
 664         vlan->lowerdev = lowerdev;
 665         vlan->dev      = dev;
 666         vlan->port     = port;
 667         vlan->receive  = receive;
 668         vlan->forward  = forward;
 669
 670         vlan->mode     = MACVLAN_MODE_VEPA;
 671         if (data && data[IFLA_MACVLAN_MODE])
 672                 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
 673
 674         err = register_netdevice(dev);
 675         if (err < 0)
 676                 goto destroy_port;
 677
 678         list_add_tail(&vlan->list, &port->vlans);
 679         netif_stacked_transfer_operstate(lowerdev, dev);
 680
 681         return 0;
 682
 683 destroy_port:
 684         if (list_empty(&port->vlans))
 685                 macvlan_port_destroy(lowerdev);
 686
 687         return err;
 688 }
 689 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
 690
 691 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
 692                            struct nlattr *tb[], struct nlattr *data[])
 693 {
 694         return macvlan_common_newlink(src_net, dev, tb, data,
 695                                       netif_rx,
 696                                       dev_forward_skb);
 697 }
 698
 699 void macvlan_dellink(struct net_device *dev, struct list_head *head)
 700 {
 701         struct macvlan_dev *vlan = netdev_priv(dev);
 702         struct macvlan_port *port = vlan->port;
 703
 704         list_del(&vlan->list);
 705         unregister_netdevice_queue(dev, head);
 706
 707         if (list_empty(&port->vlans))
 708                 macvlan_port_destroy(port->dev);
 709 }
 710 EXPORT_SYMBOL_GPL(macvlan_dellink);
 711
 712 static int macvlan_changelink(struct net_device *dev,
 713                 struct nlattr *tb[], struct nlattr *data[])
 714 {
 715         struct macvlan_dev *vlan = netdev_priv(dev);
 716         if (data && data[IFLA_MACVLAN_MODE])
 717                 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
 718         return 0;
 719 }
 720
 721 static size_t macvlan_get_size(const struct net_device *dev)
 722 {
 723         return nla_total_size(4);
 724 }
 725
 726 static int macvlan_fill_info(struct sk_buff *skb,
 727                                 const struct net_device *dev)
 728 {
 729         struct macvlan_dev *vlan = netdev_priv(dev);
 730
 731         NLA_PUT_U32(skb, IFLA_MACVLAN_MODE, vlan->mode);
 732         return 0;
 733
 734 nla_put_failure:
 735         return -EMSGSIZE;
 736 }
 737
 738 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
 739         [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
 740 };
 741
 742 int macvlan_link_register(struct rtnl_link_ops *ops)
 743 {
 744         /* common fields */
 745         ops->priv_size          = sizeof(struct macvlan_dev);
 746         ops->get_tx_queues      = macvlan_get_tx_queues;
 747         ops->validate           = macvlan_validate;
 748         ops->maxtype            = IFLA_MACVLAN_MAX;
 749         ops->policy             = macvlan_policy;
 750         ops->changelink         = macvlan_changelink;
 751         ops->get_size           = macvlan_get_size;
 752         ops->fill_info          = macvlan_fill_info;
 753
 754         return rtnl_link_register(ops);
 755 };
 756 EXPORT_SYMBOL_GPL(macvlan_link_register);
 757
 758 static struct rtnl_link_ops macvlan_link_ops = {
 759         .kind           = "macvlan",
 760         .setup          = macvlan_setup,
 761         .newlink        = macvlan_newlink,
 762         .dellink        = macvlan_dellink,
 763 };
 764
 765 static int macvlan_device_event(struct notifier_block *unused,
 766                                 unsigned long event, void *ptr)
 767 {
 768         struct net_device *dev = ptr;
 769         struct macvlan_dev *vlan, *next;
 770         struct macvlan_port *port;
 771
 772         if (!macvlan_port_exists(dev))
 773                 return NOTIFY_DONE;
 774
 775         port = macvlan_port_get(dev);
 776
 777         switch (event) {
 778         case NETDEV_CHANGE:
 779                 list_for_each_entry(vlan, &port->vlans, list)
 780                         netif_stacked_transfer_operstate(vlan->lowerdev,
 781                                                          vlan->dev);
 782                 break;
 783         case NETDEV_FEAT_CHANGE:
 784                 list_for_each_entry(vlan, &port->vlans, list) {
 785                         vlan->dev->features = dev->features & MACVLAN_FEATURES;
 786                         vlan->dev->gso_max_size = dev->gso_max_size;
 787                         netdev_features_change(vlan->dev);
 788                 }
 789                 break;
 790         case NETDEV_UNREGISTER:
 791                 /* twiddle thumbs on netns device moves */
 792                 if (dev->reg_state != NETREG_UNREGISTERING)
 793                         break;
 794
 795                 list_for_each_entry_safe(vlan, next, &port->vlans, list)
 796                         vlan->dev->rtnl_link_ops->dellink(vlan->dev, NULL);
 797                 break;
 798         case NETDEV_PRE_TYPE_CHANGE:
 799                 /* Forbid underlaying device to change its type. */
 800                 return NOTIFY_BAD;
 801         }
 802         return NOTIFY_DONE;
 803 }
 804
 805 static struct notifier_block macvlan_notifier_block __read_mostly = {
 806         .notifier_call  = macvlan_device_event,
 807 };
 808
 809 static int __init macvlan_init_module(void)
 810 {
 811         int err;
 812
 813         register_netdevice_notifier(&macvlan_notifier_block);
 814
 815         err = macvlan_link_register(&macvlan_link_ops);
 816         if (err < 0)
 817                 goto err1;
 818         return 0;
 819 err1:
 820         unregister_netdevice_notifier(&macvlan_notifier_block);
 821         return err;
 822 }
 823
 824 static void __exit macvlan_cleanup_module(void)
 825 {
 826         rtnl_link_unregister(&macvlan_link_ops);
 827         unregister_netdevice_notifier(&macvlan_notifier_block);
 828 }
 829
 830 module_init(macvlan_init_module);
 831 module_exit(macvlan_cleanup_module);
 832
 833 MODULE_LICENSE("GPL");
 834 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
 835 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
 836 MODULE_ALIAS_RTNL_LINK("macvlan");