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         int                     count;
  43 };
  44
  45 static void macvlan_port_destroy(struct net_device *dev);
  46
  47 #define macvlan_port_get_rcu(dev) \
  48         ((struct macvlan_port *) rcu_dereference(dev->rx_handler_data))
  49 #define macvlan_port_get(dev) ((struct macvlan_port *) dev->rx_handler_data)
  50 #define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT)
  51
  52 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
  53                                                const unsigned char *addr)
  54 {
  55         struct macvlan_dev *vlan;
  56         struct hlist_node *n;
  57
  58         hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[addr[5]], hlist) {
  59                 if (!compare_ether_addr_64bits(vlan->dev->dev_addr, addr))
  60                         return vlan;
  61         }
  62         return NULL;
  63 }
  64
  65 static void macvlan_hash_add(struct macvlan_dev *vlan)
  66 {
  67         struct macvlan_port *port = vlan->port;
  68         const unsigned char *addr = vlan->dev->dev_addr;
  69
  70         hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]);
  71 }
  72
  73 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
  74 {
  75         hlist_del_rcu(&vlan->hlist);
  76         if (sync)
  77                 synchronize_rcu();
  78 }
  79
  80 static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
  81                                         const unsigned char *addr)
  82 {
  83         macvlan_hash_del(vlan, true);
  84         /* Now that we are unhashed it is safe to change the device
  85          * address without confusing packet delivery.
  86          */
  87         memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
  88         macvlan_hash_add(vlan);
  89 }
  90
  91 static int macvlan_addr_busy(const struct macvlan_port *port,
  92                                 const unsigned char *addr)
  93 {
  94         /* Test to see if the specified multicast address is
  95          * currently in use by the underlying device or
  96          * another macvlan.
  97          */
  98         if (!compare_ether_addr_64bits(port->dev->dev_addr, addr))
  99                 return 1;
 100
 101         if (macvlan_hash_lookup(port, addr))
 102                 return 1;
 103
 104         return 0;
 105 }
 106
 107
 108 static int macvlan_broadcast_one(struct sk_buff *skb,
 109                                  const struct macvlan_dev *vlan,
 110                                  const struct ethhdr *eth, bool local)
 111 {
 112         struct net_device *dev = vlan->dev;
 113         if (!skb)
 114                 return NET_RX_DROP;
 115
 116         if (local)
 117                 return vlan->forward(dev, skb);
 118
 119         skb->dev = dev;
 120         if (!compare_ether_addr_64bits(eth->h_dest,
 121                                        dev->broadcast))
 122                 skb->pkt_type = PACKET_BROADCAST;
 123         else
 124                 skb->pkt_type = PACKET_MULTICAST;
 125
 126         return vlan->receive(skb);
 127 }
 128
 129 static void macvlan_broadcast(struct sk_buff *skb,
 130                               const struct macvlan_port *port,
 131                               struct net_device *src,
 132                               enum macvlan_mode mode)
 133 {
 134         const struct ethhdr *eth = eth_hdr(skb);
 135         const struct macvlan_dev *vlan;
 136         struct hlist_node *n;
 137         struct sk_buff *nskb;
 138         unsigned int i;
 139         int err;
 140
 141         if (skb->protocol == htons(ETH_P_PAUSE))
 142                 return;
 143
 144         for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
 145                 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[i], hlist) {
 146                         if (vlan->dev == src || !(vlan->mode & mode))
 147                                 continue;
 148
 149                         nskb = skb_clone(skb, GFP_ATOMIC);
 150                         err = macvlan_broadcast_one(nskb, vlan, eth,
 151                                          mode == MACVLAN_MODE_BRIDGE);
 152                         macvlan_count_rx(vlan, skb->len + ETH_HLEN,
 153                                          err == NET_RX_SUCCESS, 1);
 154                 }
 155         }
 156 }
 157
 158 /* called under rcu_read_lock() from netif_receive_skb */
 159 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
 160 {
 161         struct macvlan_port *port;
 162         struct sk_buff *skb = *pskb;
 163         const struct ethhdr *eth = eth_hdr(skb);
 164         const struct macvlan_dev *vlan;
 165         const struct macvlan_dev *src;
 166         struct net_device *dev;
 167         unsigned int len = 0;
 168         int ret = NET_RX_DROP;
 169
 170         port = macvlan_port_get_rcu(skb->dev);
 171         if (is_multicast_ether_addr(eth->h_dest)) {
 172                 skb = ip_check_defrag(skb, IP_DEFRAG_MACVLAN);
 173                 if (!skb)
 174                         return RX_HANDLER_CONSUMED;
 175                 src = macvlan_hash_lookup(port, eth->h_source);
 176                 if (!src)
 177                         /* frame comes from an external address */
 178                         macvlan_broadcast(skb, port, NULL,
 179                                           MACVLAN_MODE_PRIVATE |
 180                                           MACVLAN_MODE_VEPA    |
 181                                           MACVLAN_MODE_PASSTHRU|
 182                                           MACVLAN_MODE_BRIDGE);
 183                 else if (src->mode == MACVLAN_MODE_VEPA)
 184                         /* flood to everyone except source */
 185                         macvlan_broadcast(skb, port, src->dev,
 186                                           MACVLAN_MODE_VEPA |
 187                                           MACVLAN_MODE_BRIDGE);
 188                 else if (src->mode == MACVLAN_MODE_BRIDGE)
 189                         /*
 190                          * flood only to VEPA ports, bridge ports
 191                          * already saw the frame on the way out.
 192                          */
 193                         macvlan_broadcast(skb, port, src->dev,
 194                                           MACVLAN_MODE_VEPA);
 195                 else {
 196                         /* forward to original port. */
 197                         vlan = src;
 198                         ret = macvlan_broadcast_one(skb, vlan, eth, 0);
 199                         goto out;
 200                 }
 201
 202                 return RX_HANDLER_PASS;
 203         }
 204
 205         if (port->passthru)
 206                 vlan = list_first_entry(&port->vlans, struct macvlan_dev, list);
 207         else
 208                 vlan = macvlan_hash_lookup(port, eth->h_dest);
 209         if (vlan == NULL)
 210                 return RX_HANDLER_PASS;
 211
 212         dev = vlan->dev;
 213         if (unlikely(!(dev->flags & IFF_UP))) {
 214                 kfree_skb(skb);
 215                 return RX_HANDLER_CONSUMED;
 216         }
 217         len = skb->len + ETH_HLEN;
 218         skb = skb_share_check(skb, GFP_ATOMIC);
 219         if (!skb)
 220                 goto out;
 221
 222         skb->dev = dev;
 223         skb->pkt_type = PACKET_HOST;
 224
 225         ret = vlan->receive(skb);
 226
 227 out:
 228         macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0);
 229         return RX_HANDLER_CONSUMED;
 230 }
 231
 232 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
 233 {
 234         const struct macvlan_dev *vlan = netdev_priv(dev);
 235         const struct macvlan_port *port = vlan->port;
 236         const struct macvlan_dev *dest;
 237         __u8 ip_summed = skb->ip_summed;
 238
 239         if (vlan->mode == MACVLAN_MODE_BRIDGE) {
 240                 const struct ethhdr *eth = (void *)skb->data;
 241                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 242
 243                 /* send to other bridge ports directly */
 244                 if (is_multicast_ether_addr(eth->h_dest)) {
 245                         macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
 246                         goto xmit_world;
 247                 }
 248
 249                 dest = macvlan_hash_lookup(port, eth->h_dest);
 250                 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
 251                         /* send to lowerdev first for its network taps */
 252                         dev_forward_skb(vlan->lowerdev, skb);
 253
 254                         return NET_XMIT_SUCCESS;
 255                 }
 256         }
 257
 258 xmit_world:
 259         skb->ip_summed = ip_summed;
 260         skb_set_dev(skb, vlan->lowerdev);
 261         return dev_queue_xmit(skb);
 262 }
 263
 264 netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
 265                                struct net_device *dev)
 266 {
 267         unsigned int len = skb->len;
 268         int ret;
 269         const struct macvlan_dev *vlan = netdev_priv(dev);
 270
 271         ret = macvlan_queue_xmit(skb, dev);
 272         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 273                 struct macvlan_pcpu_stats *pcpu_stats;
 274
 275                 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
 276                 u64_stats_update_begin(&pcpu_stats->syncp);
 277                 pcpu_stats->tx_packets++;
 278                 pcpu_stats->tx_bytes += len;
 279                 u64_stats_update_end(&pcpu_stats->syncp);
 280         } else {
 281                 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
 282         }
 283         return ret;
 284 }
 285 EXPORT_SYMBOL_GPL(macvlan_start_xmit);
 286
 287 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
 288                                unsigned short type, const void *daddr,
 289                                const void *saddr, unsigned len)
 290 {
 291         const struct macvlan_dev *vlan = netdev_priv(dev);
 292         struct net_device *lowerdev = vlan->lowerdev;
 293
 294         return dev_hard_header(skb, lowerdev, type, daddr,
 295                                saddr ? : dev->dev_addr, len);
 296 }
 297
 298 static const struct header_ops macvlan_hard_header_ops = {
 299         .create         = macvlan_hard_header,
 300         .rebuild        = eth_rebuild_header,
 301         .parse          = eth_header_parse,
 302         .cache          = eth_header_cache,
 303         .cache_update   = eth_header_cache_update,
 304 };
 305
 306 static int macvlan_open(struct net_device *dev)
 307 {
 308         struct macvlan_dev *vlan = netdev_priv(dev);
 309         struct net_device *lowerdev = vlan->lowerdev;
 310         int err;
 311
 312         if (vlan->port->passthru) {
 313                 dev_set_promiscuity(lowerdev, 1);
 314                 goto hash_add;
 315         }
 316
 317         err = -EBUSY;
 318         if (macvlan_addr_busy(vlan->port, dev->dev_addr))
 319                 goto out;
 320
 321         err = dev_uc_add(lowerdev, dev->dev_addr);
 322         if (err < 0)
 323                 goto out;
 324         if (dev->flags & IFF_ALLMULTI) {
 325                 err = dev_set_allmulti(lowerdev, 1);
 326                 if (err < 0)
 327                         goto del_unicast;
 328         }
 329
 330 hash_add:
 331         macvlan_hash_add(vlan);
 332         return 0;
 333
 334 del_unicast:
 335         dev_uc_del(lowerdev, dev->dev_addr);
 336 out:
 337         return err;
 338 }
 339
 340 static int macvlan_stop(struct net_device *dev)
 341 {
 342         struct macvlan_dev *vlan = netdev_priv(dev);
 343         struct net_device *lowerdev = vlan->lowerdev;
 344
 345         if (vlan->port->passthru) {
 346                 dev_set_promiscuity(lowerdev, -1);
 347                 goto hash_del;
 348         }
 349
 350         dev_mc_unsync(lowerdev, dev);
 351         if (dev->flags & IFF_ALLMULTI)
 352                 dev_set_allmulti(lowerdev, -1);
 353
 354         dev_uc_del(lowerdev, dev->dev_addr);
 355
 356 hash_del:
 357         macvlan_hash_del(vlan, !dev->dismantle);
 358         return 0;
 359 }
 360
 361 static int macvlan_set_mac_address(struct net_device *dev, void *p)
 362 {
 363         struct macvlan_dev *vlan = netdev_priv(dev);
 364         struct net_device *lowerdev = vlan->lowerdev;
 365         struct sockaddr *addr = p;
 366         int err;
 367
 368         if (!is_valid_ether_addr(addr->sa_data))
 369                 return -EADDRNOTAVAIL;
 370
 371         if (!(dev->flags & IFF_UP)) {
 372                 /* Just copy in the new address */
 373                 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 374         } else {
 375                 /* Rehash and update the device filters */
 376                 if (macvlan_addr_busy(vlan->port, addr->sa_data))
 377                         return -EBUSY;
 378
 379                 err = dev_uc_add(lowerdev, addr->sa_data);
 380                 if (err)
 381                         return err;
 382
 383                 dev_uc_del(lowerdev, dev->dev_addr);
 384
 385                 macvlan_hash_change_addr(vlan, addr->sa_data);
 386         }
 387         return 0;
 388 }
 389
 390 static void macvlan_change_rx_flags(struct net_device *dev, int change)
 391 {
 392         struct macvlan_dev *vlan = netdev_priv(dev);
 393         struct net_device *lowerdev = vlan->lowerdev;
 394
 395         if (change & IFF_ALLMULTI)
 396                 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 397 }
 398
 399 static void macvlan_set_multicast_list(struct net_device *dev)
 400 {
 401         struct macvlan_dev *vlan = netdev_priv(dev);
 402
 403         dev_mc_sync(vlan->lowerdev, dev);
 404 }
 405
 406 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
 407 {
 408         struct macvlan_dev *vlan = netdev_priv(dev);
 409
 410         if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
 411                 return -EINVAL;
 412         dev->mtu = new_mtu;
 413         return 0;
 414 }
 415
 416 /*
 417  * macvlan network devices have devices nesting below it and are a special
 418  * "super class" of normal network devices; split their locks off into a
 419  * separate class since they always nest.
 420  */
 421 static struct lock_class_key macvlan_netdev_xmit_lock_key;
 422 static struct lock_class_key macvlan_netdev_addr_lock_key;
 423
 424 #define MACVLAN_FEATURES \
 425         (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
 426          NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
 427          NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
 428          NETIF_F_HW_VLAN_FILTER)
 429
 430 #define MACVLAN_STATE_MASK \
 431         ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
 432
 433 static void macvlan_set_lockdep_class_one(struct net_device *dev,
 434                                           struct netdev_queue *txq,
 435                                           void *_unused)
 436 {
 437         lockdep_set_class(&txq->_xmit_lock,
 438                           &macvlan_netdev_xmit_lock_key);
 439 }
 440
 441 static void macvlan_set_lockdep_class(struct net_device *dev)
 442 {
 443         lockdep_set_class(&dev->addr_list_lock,
 444                           &macvlan_netdev_addr_lock_key);
 445         netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
 446 }
 447
 448 static int macvlan_init(struct net_device *dev)
 449 {
 450         struct macvlan_dev *vlan = netdev_priv(dev);
 451         const struct net_device *lowerdev = vlan->lowerdev;
 452
 453         dev->state              = (dev->state & ~MACVLAN_STATE_MASK) |
 454                                   (lowerdev->state & MACVLAN_STATE_MASK);
 455         dev->features           = lowerdev->features & MACVLAN_FEATURES;
 456         dev->features           |= NETIF_F_LLTX;
 457         dev->gso_max_size       = lowerdev->gso_max_size;
 458         dev->iflink             = lowerdev->ifindex;
 459         dev->hard_header_len    = lowerdev->hard_header_len;
 460
 461         macvlan_set_lockdep_class(dev);
 462
 463         vlan->pcpu_stats = alloc_percpu(struct macvlan_pcpu_stats);
 464         if (!vlan->pcpu_stats)
 465                 return -ENOMEM;
 466
 467         return 0;
 468 }
 469
 470 static void macvlan_uninit(struct net_device *dev)
 471 {
 472         struct macvlan_dev *vlan = netdev_priv(dev);
 473         struct macvlan_port *port = vlan->port;
 474
 475         free_percpu(vlan->pcpu_stats);
 476
 477         port->count -= 1;
 478         if (!port->count)
 479                 macvlan_port_destroy(port->dev);
 480 }
 481
 482 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
 483                                                          struct rtnl_link_stats64 *stats)
 484 {
 485         struct macvlan_dev *vlan = netdev_priv(dev);
 486
 487         if (vlan->pcpu_stats) {
 488                 struct macvlan_pcpu_stats *p;
 489                 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
 490                 u32 rx_errors = 0, tx_dropped = 0;
 491                 unsigned int start;
 492                 int i;
 493
 494                 for_each_possible_cpu(i) {
 495                         p = per_cpu_ptr(vlan->pcpu_stats, i);
 496                         do {
 497                                 start = u64_stats_fetch_begin_bh(&p->syncp);
 498                                 rx_packets      = p->rx_packets;
 499                                 rx_bytes        = p->rx_bytes;
 500                                 rx_multicast    = p->rx_multicast;
 501                                 tx_packets      = p->tx_packets;
 502                                 tx_bytes        = p->tx_bytes;
 503                         } while (u64_stats_fetch_retry_bh(&p->syncp, start));
 504
 505                         stats->rx_packets       += rx_packets;
 506                         stats->rx_bytes         += rx_bytes;
 507                         stats->multicast        += rx_multicast;
 508                         stats->tx_packets       += tx_packets;
 509                         stats->tx_bytes         += tx_bytes;
 510                         /* rx_errors & tx_dropped are u32, updated
 511                          * without syncp protection.
 512                          */
 513                         rx_errors       += p->rx_errors;
 514                         tx_dropped      += p->tx_dropped;
 515                 }
 516                 stats->rx_errors        = rx_errors;
 517                 stats->rx_dropped       = rx_errors;
 518                 stats->tx_dropped       = tx_dropped;
 519         }
 520         return stats;
 521 }
 522
 523 static void macvlan_vlan_rx_add_vid(struct net_device *dev,
 524                                     unsigned short vid)
 525 {
 526         struct macvlan_dev *vlan = netdev_priv(dev);
 527         struct net_device *lowerdev = vlan->lowerdev;
 528         const struct net_device_ops *ops = lowerdev->netdev_ops;
 529
 530         if (ops->ndo_vlan_rx_add_vid)
 531                 ops->ndo_vlan_rx_add_vid(lowerdev, vid);
 532 }
 533
 534 static void macvlan_vlan_rx_kill_vid(struct net_device *dev,
 535                                      unsigned short vid)
 536 {
 537         struct macvlan_dev *vlan = netdev_priv(dev);
 538         struct net_device *lowerdev = vlan->lowerdev;
 539         const struct net_device_ops *ops = lowerdev->netdev_ops;
 540
 541         if (ops->ndo_vlan_rx_kill_vid)
 542                 ops->ndo_vlan_rx_kill_vid(lowerdev, vid);
 543 }
 544
 545 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
 546                                         struct ethtool_drvinfo *drvinfo)
 547 {
 548         snprintf(drvinfo->driver, 32, "macvlan");
 549         snprintf(drvinfo->version, 32, "0.1");
 550 }
 551
 552 static int macvlan_ethtool_get_settings(struct net_device *dev,
 553                                         struct ethtool_cmd *cmd)
 554 {
 555         const struct macvlan_dev *vlan = netdev_priv(dev);
 556
 557         return __ethtool_get_settings(vlan->lowerdev, cmd);
 558 }
 559
 560 static const struct ethtool_ops macvlan_ethtool_ops = {
 561         .get_link               = ethtool_op_get_link,
 562         .get_settings           = macvlan_ethtool_get_settings,
 563         .get_drvinfo            = macvlan_ethtool_get_drvinfo,
 564 };
 565
 566 static const struct net_device_ops macvlan_netdev_ops = {
 567         .ndo_init               = macvlan_init,
 568         .ndo_uninit             = macvlan_uninit,
 569         .ndo_open               = macvlan_open,
 570         .ndo_stop               = macvlan_stop,
 571         .ndo_start_xmit         = macvlan_start_xmit,
 572         .ndo_change_mtu         = macvlan_change_mtu,
 573         .ndo_change_rx_flags    = macvlan_change_rx_flags,
 574         .ndo_set_mac_address    = macvlan_set_mac_address,
 575         .ndo_set_rx_mode        = macvlan_set_multicast_list,
 576         .ndo_get_stats64        = macvlan_dev_get_stats64,
 577         .ndo_validate_addr      = eth_validate_addr,
 578         .ndo_vlan_rx_add_vid    = macvlan_vlan_rx_add_vid,
 579         .ndo_vlan_rx_kill_vid   = macvlan_vlan_rx_kill_vid,
 580 };
 581
 582 void macvlan_common_setup(struct net_device *dev)
 583 {
 584         ether_setup(dev);
 585
 586         dev->priv_flags        &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
 587         dev->netdev_ops         = &macvlan_netdev_ops;
 588         dev->destructor         = free_netdev;
 589         dev->header_ops         = &macvlan_hard_header_ops,
 590         dev->ethtool_ops        = &macvlan_ethtool_ops;
 591 }
 592 EXPORT_SYMBOL_GPL(macvlan_common_setup);
 593
 594 static void macvlan_setup(struct net_device *dev)
 595 {
 596         macvlan_common_setup(dev);
 597         dev->tx_queue_len       = 0;
 598 }
 599
 600 static int macvlan_port_create(struct net_device *dev)
 601 {
 602         struct macvlan_port *port;
 603         unsigned int i;
 604         int err;
 605
 606         if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
 607                 return -EINVAL;
 608
 609         port = kzalloc(sizeof(*port), GFP_KERNEL);
 610         if (port == NULL)
 611                 return -ENOMEM;
 612
 613         port->passthru = false;
 614         port->dev = dev;
 615         INIT_LIST_HEAD(&port->vlans);
 616         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
 617                 INIT_HLIST_HEAD(&port->vlan_hash[i]);
 618
 619         err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
 620         if (err)
 621                 kfree(port);
 622         else
 623                 dev->priv_flags |= IFF_MACVLAN_PORT;
 624         return err;
 625 }
 626
 627 static void macvlan_port_destroy(struct net_device *dev)
 628 {
 629         struct macvlan_port *port = macvlan_port_get(dev);
 630
 631         dev->priv_flags &= ~IFF_MACVLAN_PORT;
 632         netdev_rx_handler_unregister(dev);
 633         kfree_rcu(port, rcu);
 634 }
 635
 636 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
 637 {
 638         if (tb[IFLA_ADDRESS]) {
 639                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
 640                         return -EINVAL;
 641                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
 642                         return -EADDRNOTAVAIL;
 643         }
 644
 645         if (data && data[IFLA_MACVLAN_MODE]) {
 646                 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
 647                 case MACVLAN_MODE_PRIVATE:
 648                 case MACVLAN_MODE_VEPA:
 649                 case MACVLAN_MODE_BRIDGE:
 650                 case MACVLAN_MODE_PASSTHRU:
 651                         break;
 652                 default:
 653                         return -EINVAL;
 654                 }
 655         }
 656         return 0;
 657 }
 658
 659 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
 660                            struct nlattr *tb[], struct nlattr *data[],
 661                            int (*receive)(struct sk_buff *skb),
 662                            int (*forward)(struct net_device *dev,
 663                                           struct sk_buff *skb))
 664 {
 665         struct macvlan_dev *vlan = netdev_priv(dev);
 666         struct macvlan_port *port;
 667         struct net_device *lowerdev;
 668         int err;
 669
 670         if (!tb[IFLA_LINK])
 671                 return -EINVAL;
 672
 673         lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
 674         if (lowerdev == NULL)
 675                 return -ENODEV;
 676
 677         /* When creating macvlans on top of other macvlans - use
 678          * the real device as the lowerdev.
 679          */
 680         if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) {
 681                 struct macvlan_dev *lowervlan = netdev_priv(lowerdev);
 682                 lowerdev = lowervlan->lowerdev;
 683         }
 684
 685         if (!tb[IFLA_MTU])
 686                 dev->mtu = lowerdev->mtu;
 687         else if (dev->mtu > lowerdev->mtu)
 688                 return -EINVAL;
 689
 690         if (!tb[IFLA_ADDRESS])
 691                 random_ether_addr(dev->dev_addr);
 692
 693         if (!macvlan_port_exists(lowerdev)) {
 694                 err = macvlan_port_create(lowerdev);
 695                 if (err < 0)
 696                         return err;
 697         }
 698         port = macvlan_port_get(lowerdev);
 699
 700         /* Only 1 macvlan device can be created in passthru mode */
 701         if (port->passthru)
 702                 return -EINVAL;
 703
 704         vlan->lowerdev = lowerdev;
 705         vlan->dev      = dev;
 706         vlan->port     = port;
 707         vlan->receive  = receive;
 708         vlan->forward  = forward;
 709
 710         vlan->mode     = MACVLAN_MODE_VEPA;
 711         if (data && data[IFLA_MACVLAN_MODE])
 712                 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
 713
 714         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
 715                 if (port->count)
 716                         return -EINVAL;
 717                 port->passthru = true;
 718                 memcpy(dev->dev_addr, lowerdev->dev_addr, ETH_ALEN);
 719         }
 720
 721         port->count += 1;
 722         err = register_netdevice(dev);
 723         if (err < 0)
 724                 goto destroy_port;
 725
 726         list_add_tail(&vlan->list, &port->vlans);
 727         netif_stacked_transfer_operstate(lowerdev, dev);
 728
 729         return 0;
 730
 731 destroy_port:
 732         port->count -= 1;
 733         if (!port->count)
 734                 macvlan_port_destroy(lowerdev);
 735
 736         return err;
 737 }
 738 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
 739
 740 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
 741                            struct nlattr *tb[], struct nlattr *data[])
 742 {
 743         return macvlan_common_newlink(src_net, dev, tb, data,
 744                                       netif_rx,
 745                                       dev_forward_skb);
 746 }
 747
 748 void macvlan_dellink(struct net_device *dev, struct list_head *head)
 749 {
 750         struct macvlan_dev *vlan = netdev_priv(dev);
 751
 752         list_del(&vlan->list);
 753         unregister_netdevice_queue(dev, head);
 754 }
 755 EXPORT_SYMBOL_GPL(macvlan_dellink);
 756
 757 static int macvlan_changelink(struct net_device *dev,
 758                 struct nlattr *tb[], struct nlattr *data[])
 759 {
 760         struct macvlan_dev *vlan = netdev_priv(dev);
 761         if (data && data[IFLA_MACVLAN_MODE])
 762                 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
 763         return 0;
 764 }
 765
 766 static size_t macvlan_get_size(const struct net_device *dev)
 767 {
 768         return nla_total_size(4);
 769 }
 770
 771 static int macvlan_fill_info(struct sk_buff *skb,
 772                                 const struct net_device *dev)
 773 {
 774         struct macvlan_dev *vlan = netdev_priv(dev);
 775
 776         NLA_PUT_U32(skb, IFLA_MACVLAN_MODE, vlan->mode);
 777         return 0;
 778
 779 nla_put_failure:
 780         return -EMSGSIZE;
 781 }
 782
 783 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
 784         [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
 785 };
 786
 787 int macvlan_link_register(struct rtnl_link_ops *ops)
 788 {
 789         /* common fields */
 790         ops->priv_size          = sizeof(struct macvlan_dev);
 791         ops->validate           = macvlan_validate;
 792         ops->maxtype            = IFLA_MACVLAN_MAX;
 793         ops->policy             = macvlan_policy;
 794         ops->changelink         = macvlan_changelink;
 795         ops->get_size           = macvlan_get_size;
 796         ops->fill_info          = macvlan_fill_info;
 797
 798         return rtnl_link_register(ops);
 799 };
 800 EXPORT_SYMBOL_GPL(macvlan_link_register);
 801
 802 static struct rtnl_link_ops macvlan_link_ops = {
 803         .kind           = "macvlan",
 804         .setup          = macvlan_setup,
 805         .newlink        = macvlan_newlink,
 806         .dellink        = macvlan_dellink,
 807 };
 808
 809 static int macvlan_device_event(struct notifier_block *unused,
 810                                 unsigned long event, void *ptr)
 811 {
 812         struct net_device *dev = ptr;
 813         struct macvlan_dev *vlan, *next;
 814         struct macvlan_port *port;
 815         LIST_HEAD(list_kill);
 816
 817         if (!macvlan_port_exists(dev))
 818                 return NOTIFY_DONE;
 819
 820         port = macvlan_port_get(dev);
 821
 822         switch (event) {
 823         case NETDEV_CHANGE:
 824                 list_for_each_entry(vlan, &port->vlans, list)
 825                         netif_stacked_transfer_operstate(vlan->lowerdev,
 826                                                          vlan->dev);
 827                 break;
 828         case NETDEV_FEAT_CHANGE:
 829                 list_for_each_entry(vlan, &port->vlans, list) {
 830                         vlan->dev->features = dev->features & MACVLAN_FEATURES;
 831                         vlan->dev->gso_max_size = dev->gso_max_size;
 832                         netdev_features_change(vlan->dev);
 833                 }
 834                 break;
 835         case NETDEV_UNREGISTER:
 836                 /* twiddle thumbs on netns device moves */
 837                 if (dev->reg_state != NETREG_UNREGISTERING)
 838                         break;
 839
 840                 list_for_each_entry_safe(vlan, next, &port->vlans, list)
 841                         vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
 842                 unregister_netdevice_many(&list_kill);
 843                 list_del(&list_kill);
 844                 break;
 845         case NETDEV_PRE_TYPE_CHANGE:
 846                 /* Forbid underlaying device to change its type. */
 847                 return NOTIFY_BAD;
 848         }
 849         return NOTIFY_DONE;
 850 }
 851
 852 static struct notifier_block macvlan_notifier_block __read_mostly = {
 853         .notifier_call  = macvlan_device_event,
 854 };
 855
 856 static int __init macvlan_init_module(void)
 857 {
 858         int err;
 859
 860         register_netdevice_notifier(&macvlan_notifier_block);
 861
 862         err = macvlan_link_register(&macvlan_link_ops);
 863         if (err < 0)
 864                 goto err1;
 865         return 0;
 866 err1:
 867         unregister_netdevice_notifier(&macvlan_notifier_block);
 868         return err;
 869 }
 870
 871 static void __exit macvlan_cleanup_module(void)
 872 {
 873         rtnl_link_unregister(&macvlan_link_ops);
 874         unregister_netdevice_notifier(&macvlan_notifier_block);
 875 }
 876
 877 module_init(macvlan_init_module);
 878 module_exit(macvlan_cleanup_module);
 879
 880 MODULE_LICENSE("GPL");
 881 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
 882 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
 883 MODULE_ALIAS_RTNL_LINK("macvlan");