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         bool                    passthru;
  42 };
  43
  44 #define macvlan_port_get_rcu(dev) \
  45         ((struct macvlan_port *) rcu_dereference(dev->rx_handler_data))
  46 #define macvlan_port_get(dev) ((struct macvlan_port *) dev->rx_handler_data)
  47 #define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT)
  48
  49 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
  50                                                const unsigned char *addr)
  51 {
  52         struct macvlan_dev *vlan;
  53         struct hlist_node *n;
  54
  55         hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[addr[5]], hlist) {
  56                 if (!compare_ether_addr_64bits(vlan->dev->dev_addr, addr))
  57                         return vlan;
  58         }
  59         return NULL;
  60 }
  61
  62 static void macvlan_hash_add(struct macvlan_dev *vlan)
  63 {
  64         struct macvlan_port *port = vlan->port;
  65         const unsigned char *addr = vlan->dev->dev_addr;
  66
  67         hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]);
  68 }
  69
  70 static void macvlan_hash_del(struct macvlan_dev *vlan)
  71 {
  72         hlist_del_rcu(&vlan->hlist);
  73         synchronize_rcu();
  74 }
  75
  76 static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
  77                                         const unsigned char *addr)
  78 {
  79         macvlan_hash_del(vlan);
  80         /* Now that we are unhashed it is safe to change the device
  81          * address without confusing packet delivery.
  82          */
  83         memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
  84         macvlan_hash_add(vlan);
  85 }
  86
  87 static int macvlan_addr_busy(const struct macvlan_port *port,
  88                                 const unsigned char *addr)
  89 {
  90         /* Test to see if the specified multicast address is
  91          * currently in use by the underlying device or
  92          * another macvlan.
  93          */
  94         if (!compare_ether_addr_64bits(port->dev->dev_addr, addr))
  95                 return 1;
  96
  97         if (macvlan_hash_lookup(port, addr))
  98                 return 1;
  99
 100         return 0;
 101 }
 102
 103
 104 static int macvlan_broadcast_one(struct sk_buff *skb,
 105                                  const struct macvlan_dev *vlan,
 106                                  const struct ethhdr *eth, bool local)
 107 {
 108         struct net_device *dev = vlan->dev;
 109         if (!skb)
 110                 return NET_RX_DROP;
 111
 112         if (local)
 113                 return vlan->forward(dev, skb);
 114
 115         skb->dev = dev;
 116         if (!compare_ether_addr_64bits(eth->h_dest,
 117                                        dev->broadcast))
 118                 skb->pkt_type = PACKET_BROADCAST;
 119         else
 120                 skb->pkt_type = PACKET_MULTICAST;
 121
 122         return vlan->receive(skb);
 123 }
 124
 125 static void macvlan_broadcast(struct sk_buff *skb,
 126                               const struct macvlan_port *port,
 127                               struct net_device *src,
 128                               enum macvlan_mode mode)
 129 {
 130         const struct ethhdr *eth = eth_hdr(skb);
 131         const struct macvlan_dev *vlan;
 132         struct hlist_node *n;
 133         struct sk_buff *nskb;
 134         unsigned int i;
 135         int err;
 136
 137         if (skb->protocol == htons(ETH_P_PAUSE))
 138                 return;
 139
 140         for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
 141                 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[i], hlist) {
 142                         if (vlan->dev == src || !(vlan->mode & mode))
 143                                 continue;
 144
 145                         nskb = skb_clone(skb, GFP_ATOMIC);
 146                         err = macvlan_broadcast_one(nskb, vlan, eth,
 147                                          mode == MACVLAN_MODE_BRIDGE);
 148                         macvlan_count_rx(vlan, skb->len + ETH_HLEN,
 149                                          err == NET_RX_SUCCESS, 1);
 150                 }
 151         }
 152 }
 153
 154 /* called under rcu_read_lock() from netif_receive_skb */
 155 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
 156 {
 157         struct macvlan_port *port;
 158         struct sk_buff *skb = *pskb;
 159         const struct ethhdr *eth = eth_hdr(skb);
 160         const struct macvlan_dev *vlan;
 161         const struct macvlan_dev *src;
 162         struct net_device *dev;
 163         unsigned int len = 0;
 164         int ret = NET_RX_DROP;
 165
 166         port = macvlan_port_get_rcu(skb->dev);
 167         if (is_multicast_ether_addr(eth->h_dest)) {
 168                 src = macvlan_hash_lookup(port, eth->h_source);
 169                 if (!src)
 170                         /* frame comes from an external address */
 171                         macvlan_broadcast(skb, port, NULL,
 172                                           MACVLAN_MODE_PRIVATE |
 173                                           MACVLAN_MODE_VEPA    |
 174                                           MACVLAN_MODE_PASSTHRU|
 175                                           MACVLAN_MODE_BRIDGE);
 176                 else if (src->mode == MACVLAN_MODE_VEPA)
 177                         /* flood to everyone except source */
 178                         macvlan_broadcast(skb, port, src->dev,
 179                                           MACVLAN_MODE_VEPA |
 180                                           MACVLAN_MODE_BRIDGE);
 181                 else if (src->mode == MACVLAN_MODE_BRIDGE)
 182                         /*
 183                          * flood only to VEPA ports, bridge ports
 184                          * already saw the frame on the way out.
 185                          */
 186                         macvlan_broadcast(skb, port, src->dev,
 187                                           MACVLAN_MODE_VEPA);
 188                 return RX_HANDLER_PASS;
 189         }
 190
 191         if (port->passthru)
 192                 vlan = list_first_entry(&port->vlans, struct macvlan_dev, list);
 193         else
 194                 vlan = macvlan_hash_lookup(port, eth->h_dest);
 195         if (vlan == NULL)
 196                 return RX_HANDLER_PASS;
 197
 198         dev = vlan->dev;
 199         if (unlikely(!(dev->flags & IFF_UP))) {
 200                 kfree_skb(skb);
 201                 return RX_HANDLER_CONSUMED;
 202         }
 203         len = skb->len + ETH_HLEN;
 204         skb = skb_share_check(skb, GFP_ATOMIC);
 205         if (!skb)
 206                 goto out;
 207
 208         skb->dev = dev;
 209         skb->pkt_type = PACKET_HOST;
 210
 211         ret = vlan->receive(skb);
 212
 213 out:
 214         macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0);
 215         return RX_HANDLER_CONSUMED;
 216 }
 217
 218 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
 219 {
 220         const struct macvlan_dev *vlan = netdev_priv(dev);
 221         const struct macvlan_port *port = vlan->port;
 222         const struct macvlan_dev *dest;
 223         __u8 ip_summed = skb->ip_summed;
 224
 225         if (vlan->mode == MACVLAN_MODE_BRIDGE) {
 226                 const struct ethhdr *eth = (void *)skb->data;
 227                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 228
 229                 /* send to other bridge ports directly */
 230                 if (is_multicast_ether_addr(eth->h_dest)) {
 231                         macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
 232                         goto xmit_world;
 233                 }
 234
 235                 dest = macvlan_hash_lookup(port, eth->h_dest);
 236                 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
 237                         unsigned int length = skb->len + ETH_HLEN;
 238                         int ret = dest->forward(dest->dev, skb);
 239                         macvlan_count_rx(dest, length,
 240                                          ret == NET_RX_SUCCESS, 0);
 241
 242                         return NET_XMIT_SUCCESS;
 243                 }
 244         }
 245
 246 xmit_world:
 247         skb->ip_summed = ip_summed;
 248         skb_set_dev(skb, vlan->lowerdev);
 249         return dev_queue_xmit(skb);
 250 }
 251
 252 netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
 253                                struct net_device *dev)
 254 {
 255         unsigned int len = skb->len;
 256         int ret;
 257         const struct macvlan_dev *vlan = netdev_priv(dev);
 258
 259         ret = macvlan_queue_xmit(skb, dev);
 260         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 261                 struct macvlan_pcpu_stats *pcpu_stats;
 262
 263                 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
 264                 u64_stats_update_begin(&pcpu_stats->syncp);
 265                 pcpu_stats->tx_packets++;
 266                 pcpu_stats->tx_bytes += len;
 267                 u64_stats_update_end(&pcpu_stats->syncp);
 268         } else {
 269                 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
 270         }
 271         return ret;
 272 }
 273 EXPORT_SYMBOL_GPL(macvlan_start_xmit);
 274
 275 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
 276                                unsigned short type, const void *daddr,
 277                                const void *saddr, unsigned len)
 278 {
 279         const struct macvlan_dev *vlan = netdev_priv(dev);
 280         struct net_device *lowerdev = vlan->lowerdev;
 281
 282         return dev_hard_header(skb, lowerdev, type, daddr,
 283                                saddr ? : dev->dev_addr, len);
 284 }
 285
 286 static const struct header_ops macvlan_hard_header_ops = {
 287         .create         = macvlan_hard_header,
 288         .rebuild        = eth_rebuild_header,
 289         .parse          = eth_header_parse,
 290         .cache          = eth_header_cache,
 291         .cache_update   = eth_header_cache_update,
 292 };
 293
 294 static int macvlan_open(struct net_device *dev)
 295 {
 296         struct macvlan_dev *vlan = netdev_priv(dev);
 297         struct net_device *lowerdev = vlan->lowerdev;
 298         int err;
 299
 300         if (vlan->port->passthru) {
 301                 dev_set_promiscuity(lowerdev, 1);
 302                 goto hash_add;
 303         }
 304
 305         err = -EBUSY;
 306         if (macvlan_addr_busy(vlan->port, dev->dev_addr))
 307                 goto out;
 308
 309         err = dev_uc_add(lowerdev, dev->dev_addr);
 310         if (err < 0)
 311                 goto out;
 312         if (dev->flags & IFF_ALLMULTI) {
 313                 err = dev_set_allmulti(lowerdev, 1);
 314                 if (err < 0)
 315                         goto del_unicast;
 316         }
 317
 318 hash_add:
 319         macvlan_hash_add(vlan);
 320         return 0;
 321
 322 del_unicast:
 323         dev_uc_del(lowerdev, dev->dev_addr);
 324 out:
 325         return err;
 326 }
 327
 328 static int macvlan_stop(struct net_device *dev)
 329 {
 330         struct macvlan_dev *vlan = netdev_priv(dev);
 331         struct net_device *lowerdev = vlan->lowerdev;
 332
 333         if (vlan->port->passthru) {
 334                 dev_set_promiscuity(lowerdev, -1);
 335                 goto hash_del;
 336         }
 337
 338         dev_mc_unsync(lowerdev, dev);
 339         if (dev->flags & IFF_ALLMULTI)
 340                 dev_set_allmulti(lowerdev, -1);
 341
 342         dev_uc_del(lowerdev, dev->dev_addr);
 343
 344 hash_del:
 345         macvlan_hash_del(vlan);
 346         return 0;
 347 }
 348
 349 static int macvlan_set_mac_address(struct net_device *dev, void *p)
 350 {
 351         struct macvlan_dev *vlan = netdev_priv(dev);
 352         struct net_device *lowerdev = vlan->lowerdev;
 353         struct sockaddr *addr = p;
 354         int err;
 355
 356         if (!is_valid_ether_addr(addr->sa_data))
 357                 return -EADDRNOTAVAIL;
 358
 359         if (!(dev->flags & IFF_UP)) {
 360                 /* Just copy in the new address */
 361                 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 362         } else {
 363                 /* Rehash and update the device filters */
 364                 if (macvlan_addr_busy(vlan->port, addr->sa_data))
 365                         return -EBUSY;
 366
 367                 err = dev_uc_add(lowerdev, addr->sa_data);
 368                 if (err)
 369                         return err;
 370
 371                 dev_uc_del(lowerdev, dev->dev_addr);
 372
 373                 macvlan_hash_change_addr(vlan, addr->sa_data);
 374         }
 375         return 0;
 376 }
 377
 378 static void macvlan_change_rx_flags(struct net_device *dev, int change)
 379 {
 380         struct macvlan_dev *vlan = netdev_priv(dev);
 381         struct net_device *lowerdev = vlan->lowerdev;
 382
 383         if (change & IFF_ALLMULTI)
 384                 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 385 }
 386
 387 static void macvlan_set_multicast_list(struct net_device *dev)
 388 {
 389         struct macvlan_dev *vlan = netdev_priv(dev);
 390
 391         dev_mc_sync(vlan->lowerdev, dev);
 392 }
 393
 394 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
 395 {
 396         struct macvlan_dev *vlan = netdev_priv(dev);
 397
 398         if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
 399                 return -EINVAL;
 400         dev->mtu = new_mtu;
 401         return 0;
 402 }
 403
 404 /*
 405  * macvlan network devices have devices nesting below it and are a special
 406  * "super class" of normal network devices; split their locks off into a
 407  * separate class since they always nest.
 408  */
 409 static struct lock_class_key macvlan_netdev_xmit_lock_key;
 410 static struct lock_class_key macvlan_netdev_addr_lock_key;
 411
 412 #define MACVLAN_FEATURES \
 413         (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
 414          NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
 415          NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO)
 416
 417 #define MACVLAN_STATE_MASK \
 418         ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
 419
 420 static void macvlan_set_lockdep_class_one(struct net_device *dev,
 421                                           struct netdev_queue *txq,
 422                                           void *_unused)
 423 {
 424         lockdep_set_class(&txq->_xmit_lock,
 425                           &macvlan_netdev_xmit_lock_key);
 426 }
 427
 428 static void macvlan_set_lockdep_class(struct net_device *dev)
 429 {
 430         lockdep_set_class(&dev->addr_list_lock,
 431                           &macvlan_netdev_addr_lock_key);
 432         netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
 433 }
 434
 435 static int macvlan_init(struct net_device *dev)
 436 {
 437         struct macvlan_dev *vlan = netdev_priv(dev);
 438         const struct net_device *lowerdev = vlan->lowerdev;
 439
 440         dev->state              = (dev->state & ~MACVLAN_STATE_MASK) |
 441                                   (lowerdev->state & MACVLAN_STATE_MASK);
 442         dev->features           = lowerdev->features & MACVLAN_FEATURES;
 443         dev->features           |= NETIF_F_LLTX;
 444         dev->gso_max_size       = lowerdev->gso_max_size;
 445         dev->iflink             = lowerdev->ifindex;
 446         dev->hard_header_len    = lowerdev->hard_header_len;
 447
 448         macvlan_set_lockdep_class(dev);
 449
 450         vlan->pcpu_stats = alloc_percpu(struct macvlan_pcpu_stats);
 451         if (!vlan->pcpu_stats)
 452                 return -ENOMEM;
 453
 454         return 0;
 455 }
 456
 457 static void macvlan_uninit(struct net_device *dev)
 458 {
 459         struct macvlan_dev *vlan = netdev_priv(dev);
 460
 461         free_percpu(vlan->pcpu_stats);
 462 }
 463
 464 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
 465                                                          struct rtnl_link_stats64 *stats)
 466 {
 467         struct macvlan_dev *vlan = netdev_priv(dev);
 468
 469         if (vlan->pcpu_stats) {
 470                 struct macvlan_pcpu_stats *p;
 471                 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
 472                 u32 rx_errors = 0, tx_dropped = 0;
 473                 unsigned int start;
 474                 int i;
 475
 476                 for_each_possible_cpu(i) {
 477                         p = per_cpu_ptr(vlan->pcpu_stats, i);
 478                         do {
 479                                 start = u64_stats_fetch_begin_bh(&p->syncp);
 480                                 rx_packets      = p->rx_packets;
 481                                 rx_bytes        = p->rx_bytes;
 482                                 rx_multicast    = p->rx_multicast;
 483                                 tx_packets      = p->tx_packets;
 484                                 tx_bytes        = p->tx_bytes;
 485                         } while (u64_stats_fetch_retry_bh(&p->syncp, start));
 486
 487                         stats->rx_packets       += rx_packets;
 488                         stats->rx_bytes         += rx_bytes;
 489                         stats->multicast        += rx_multicast;
 490                         stats->tx_packets       += tx_packets;
 491                         stats->tx_bytes         += tx_bytes;
 492                         /* rx_errors & tx_dropped are u32, updated
 493                          * without syncp protection.
 494                          */
 495                         rx_errors       += p->rx_errors;
 496                         tx_dropped      += p->tx_dropped;
 497                 }
 498                 stats->rx_errors        = rx_errors;
 499                 stats->rx_dropped       = rx_errors;
 500                 stats->tx_dropped       = tx_dropped;
 501         }
 502         return stats;
 503 }
 504
 505 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
 506                                         struct ethtool_drvinfo *drvinfo)
 507 {
 508         snprintf(drvinfo->driver, 32, "macvlan");
 509         snprintf(drvinfo->version, 32, "0.1");
 510 }
 511
 512 static u32 macvlan_ethtool_get_rx_csum(struct net_device *dev)
 513 {
 514         const struct macvlan_dev *vlan = netdev_priv(dev);
 515         return dev_ethtool_get_rx_csum(vlan->lowerdev);
 516 }
 517
 518 static int macvlan_ethtool_get_settings(struct net_device *dev,
 519                                         struct ethtool_cmd *cmd)
 520 {
 521         const struct macvlan_dev *vlan = netdev_priv(dev);
 522         return dev_ethtool_get_settings(vlan->lowerdev, cmd);
 523 }
 524
 525 static u32 macvlan_ethtool_get_flags(struct net_device *dev)
 526 {
 527         const struct macvlan_dev *vlan = netdev_priv(dev);
 528         return dev_ethtool_get_flags(vlan->lowerdev);
 529 }
 530
 531 static const struct ethtool_ops macvlan_ethtool_ops = {
 532         .get_link               = ethtool_op_get_link,
 533         .get_settings           = macvlan_ethtool_get_settings,
 534         .get_rx_csum            = macvlan_ethtool_get_rx_csum,
 535         .get_drvinfo            = macvlan_ethtool_get_drvinfo,
 536         .get_flags              = macvlan_ethtool_get_flags,
 537 };
 538
 539 static const struct net_device_ops macvlan_netdev_ops = {
 540         .ndo_init               = macvlan_init,
 541         .ndo_uninit             = macvlan_uninit,
 542         .ndo_open               = macvlan_open,
 543         .ndo_stop               = macvlan_stop,
 544         .ndo_start_xmit         = macvlan_start_xmit,
 545         .ndo_change_mtu         = macvlan_change_mtu,
 546         .ndo_change_rx_flags    = macvlan_change_rx_flags,
 547         .ndo_set_mac_address    = macvlan_set_mac_address,
 548         .ndo_set_multicast_list = macvlan_set_multicast_list,
 549         .ndo_get_stats64        = macvlan_dev_get_stats64,
 550         .ndo_validate_addr      = eth_validate_addr,
 551 };
 552
 553 void macvlan_common_setup(struct net_device *dev)
 554 {
 555         ether_setup(dev);
 556
 557         dev->priv_flags        &= ~IFF_XMIT_DST_RELEASE;
 558         dev->netdev_ops         = &macvlan_netdev_ops;
 559         dev->destructor         = free_netdev;
 560         dev->header_ops         = &macvlan_hard_header_ops,
 561         dev->ethtool_ops        = &macvlan_ethtool_ops;
 562 }
 563 EXPORT_SYMBOL_GPL(macvlan_common_setup);
 564
 565 static void macvlan_setup(struct net_device *dev)
 566 {
 567         macvlan_common_setup(dev);
 568         dev->tx_queue_len       = 0;
 569 }
 570
 571 static int macvlan_port_create(struct net_device *dev)
 572 {
 573         struct macvlan_port *port;
 574         unsigned int i;
 575         int err;
 576
 577         if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
 578                 return -EINVAL;
 579
 580         port = kzalloc(sizeof(*port), GFP_KERNEL);
 581         if (port == NULL)
 582                 return -ENOMEM;
 583
 584         port->passthru = false;
 585         port->dev = dev;
 586         INIT_LIST_HEAD(&port->vlans);
 587         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
 588                 INIT_HLIST_HEAD(&port->vlan_hash[i]);
 589
 590         err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
 591         if (err)
 592                 kfree(port);
 593
 594         dev->priv_flags |= IFF_MACVLAN_PORT;
 595         return err;
 596 }
 597
 598 static void macvlan_port_rcu_free(struct rcu_head *head)
 599 {
 600         struct macvlan_port *port;
 601
 602         port = container_of(head, struct macvlan_port, rcu);
 603         kfree(port);
 604 }
 605
 606 static void macvlan_port_destroy(struct net_device *dev)
 607 {
 608         struct macvlan_port *port = macvlan_port_get(dev);
 609
 610         dev->priv_flags &= ~IFF_MACVLAN_PORT;
 611         netdev_rx_handler_unregister(dev);
 612         call_rcu(&port->rcu, macvlan_port_rcu_free);
 613 }
 614
 615 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
 616 {
 617         if (tb[IFLA_ADDRESS]) {
 618                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
 619                         return -EINVAL;
 620                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
 621                         return -EADDRNOTAVAIL;
 622         }
 623
 624         if (data && data[IFLA_MACVLAN_MODE]) {
 625                 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
 626                 case MACVLAN_MODE_PRIVATE:
 627                 case MACVLAN_MODE_VEPA:
 628                 case MACVLAN_MODE_BRIDGE:
 629                 case MACVLAN_MODE_PASSTHRU:
 630                         break;
 631                 default:
 632                         return -EINVAL;
 633                 }
 634         }
 635         return 0;
 636 }
 637
 638 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
 639                            struct nlattr *tb[], struct nlattr *data[],
 640                            int (*receive)(struct sk_buff *skb),
 641                            int (*forward)(struct net_device *dev,
 642                                           struct sk_buff *skb))
 643 {
 644         struct macvlan_dev *vlan = netdev_priv(dev);
 645         struct macvlan_port *port;
 646         struct net_device *lowerdev;
 647         int err;
 648
 649         if (!tb[IFLA_LINK])
 650                 return -EINVAL;
 651
 652         lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
 653         if (lowerdev == NULL)
 654                 return -ENODEV;
 655
 656         /* When creating macvlans on top of other macvlans - use
 657          * the real device as the lowerdev.
 658          */
 659         if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) {
 660                 struct macvlan_dev *lowervlan = netdev_priv(lowerdev);
 661                 lowerdev = lowervlan->lowerdev;
 662         }
 663
 664         if (!tb[IFLA_MTU])
 665                 dev->mtu = lowerdev->mtu;
 666         else if (dev->mtu > lowerdev->mtu)
 667                 return -EINVAL;
 668
 669         if (!tb[IFLA_ADDRESS])
 670                 random_ether_addr(dev->dev_addr);
 671
 672         if (!macvlan_port_exists(lowerdev)) {
 673                 err = macvlan_port_create(lowerdev);
 674                 if (err < 0)
 675                         return err;
 676         }
 677         port = macvlan_port_get(lowerdev);
 678
 679         /* Only 1 macvlan device can be created in passthru mode */
 680         if (port->passthru)
 681                 return -EINVAL;
 682
 683         vlan->lowerdev = lowerdev;
 684         vlan->dev      = dev;
 685         vlan->port     = port;
 686         vlan->receive  = receive;
 687         vlan->forward  = forward;
 688
 689         vlan->mode     = MACVLAN_MODE_VEPA;
 690         if (data && data[IFLA_MACVLAN_MODE])
 691                 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
 692
 693         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
 694                 if (!list_empty(&port->vlans))
 695                         return -EINVAL;
 696                 port->passthru = true;
 697                 memcpy(dev->dev_addr, lowerdev->dev_addr, ETH_ALEN);
 698         }
 699
 700         err = register_netdevice(dev);
 701         if (err < 0)
 702                 goto destroy_port;
 703
 704         list_add_tail(&vlan->list, &port->vlans);
 705         netif_stacked_transfer_operstate(lowerdev, dev);
 706
 707         return 0;
 708
 709 destroy_port:
 710         if (list_empty(&port->vlans))
 711                 macvlan_port_destroy(lowerdev);
 712
 713         return err;
 714 }
 715 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
 716
 717 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
 718                            struct nlattr *tb[], struct nlattr *data[])
 719 {
 720         return macvlan_common_newlink(src_net, dev, tb, data,
 721                                       netif_rx,
 722                                       dev_forward_skb);
 723 }
 724
 725 void macvlan_dellink(struct net_device *dev, struct list_head *head)
 726 {
 727         struct macvlan_dev *vlan = netdev_priv(dev);
 728         struct macvlan_port *port = vlan->port;
 729
 730         list_del(&vlan->list);
 731         unregister_netdevice_queue(dev, head);
 732
 733         if (list_empty(&port->vlans))
 734                 macvlan_port_destroy(port->dev);
 735 }
 736 EXPORT_SYMBOL_GPL(macvlan_dellink);
 737
 738 static int macvlan_changelink(struct net_device *dev,
 739                 struct nlattr *tb[], struct nlattr *data[])
 740 {
 741         struct macvlan_dev *vlan = netdev_priv(dev);
 742         if (data && data[IFLA_MACVLAN_MODE])
 743                 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
 744         return 0;
 745 }
 746
 747 static size_t macvlan_get_size(const struct net_device *dev)
 748 {
 749         return nla_total_size(4);
 750 }
 751
 752 static int macvlan_fill_info(struct sk_buff *skb,
 753                                 const struct net_device *dev)
 754 {
 755         struct macvlan_dev *vlan = netdev_priv(dev);
 756
 757         NLA_PUT_U32(skb, IFLA_MACVLAN_MODE, vlan->mode);
 758         return 0;
 759
 760 nla_put_failure:
 761         return -EMSGSIZE;
 762 }
 763
 764 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
 765         [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
 766 };
 767
 768 int macvlan_link_register(struct rtnl_link_ops *ops)
 769 {
 770         /* common fields */
 771         ops->priv_size          = sizeof(struct macvlan_dev);
 772         ops->validate           = macvlan_validate;
 773         ops->maxtype            = IFLA_MACVLAN_MAX;
 774         ops->policy             = macvlan_policy;
 775         ops->changelink         = macvlan_changelink;
 776         ops->get_size           = macvlan_get_size;
 777         ops->fill_info          = macvlan_fill_info;
 778
 779         return rtnl_link_register(ops);
 780 };
 781 EXPORT_SYMBOL_GPL(macvlan_link_register);
 782
 783 static struct rtnl_link_ops macvlan_link_ops = {
 784         .kind           = "macvlan",
 785         .setup          = macvlan_setup,
 786         .newlink        = macvlan_newlink,
 787         .dellink        = macvlan_dellink,
 788 };
 789
 790 static int macvlan_device_event(struct notifier_block *unused,
 791                                 unsigned long event, void *ptr)
 792 {
 793         struct net_device *dev = ptr;
 794         struct macvlan_dev *vlan, *next;
 795         struct macvlan_port *port;
 796
 797         if (!macvlan_port_exists(dev))
 798                 return NOTIFY_DONE;
 799
 800         port = macvlan_port_get(dev);
 801
 802         switch (event) {
 803         case NETDEV_CHANGE:
 804                 list_for_each_entry(vlan, &port->vlans, list)
 805                         netif_stacked_transfer_operstate(vlan->lowerdev,
 806                                                          vlan->dev);
 807                 break;
 808         case NETDEV_FEAT_CHANGE:
 809                 list_for_each_entry(vlan, &port->vlans, list) {
 810                         vlan->dev->features = dev->features & MACVLAN_FEATURES;
 811                         vlan->dev->gso_max_size = dev->gso_max_size;
 812                         netdev_features_change(vlan->dev);
 813                 }
 814                 break;
 815         case NETDEV_UNREGISTER:
 816                 /* twiddle thumbs on netns device moves */
 817                 if (dev->reg_state != NETREG_UNREGISTERING)
 818                         break;
 819
 820                 list_for_each_entry_safe(vlan, next, &port->vlans, list)
 821                         vlan->dev->rtnl_link_ops->dellink(vlan->dev, NULL);
 822                 break;
 823         case NETDEV_PRE_TYPE_CHANGE:
 824                 /* Forbid underlaying device to change its type. */
 825                 return NOTIFY_BAD;
 826         }
 827         return NOTIFY_DONE;
 828 }
 829
 830 static struct notifier_block macvlan_notifier_block __read_mostly = {
 831         .notifier_call  = macvlan_device_event,
 832 };
 833
 834 static int __init macvlan_init_module(void)
 835 {
 836         int err;
 837
 838         register_netdevice_notifier(&macvlan_notifier_block);
 839
 840         err = macvlan_link_register(&macvlan_link_ops);
 841         if (err < 0)
 842                 goto err1;
 843         return 0;
 844 err1:
 845         unregister_netdevice_notifier(&macvlan_notifier_block);
 846         return err;
 847 }
 848
 849 static void __exit macvlan_cleanup_module(void)
 850 {
 851         rtnl_link_unregister(&macvlan_link_ops);
 852         unregister_netdevice_notifier(&macvlan_notifier_block);
 853 }
 854
 855 module_init(macvlan_init_module);
 856 module_exit(macvlan_cleanup_module);
 857
 858 MODULE_LICENSE("GPL");
 859 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
 860 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
 861 MODULE_ALIAS_RTNL_LINK("macvlan");