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