drivers/net/macvlan.c

   1 /*
   2  * Copyright (c) 2007 Patrick McHardy <kaber@trash.net>
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation; either version 2 of
   7  * the License, or (at your option) any later version.
   8  *
   9  * The code this is based on carried the following copyright notice:
  10  * ---
  11  * (C) Copyright 2001-2006
  12  * Alex Zeffertt, Cambridge Broadband Ltd, ajz@cambridgebroadband.com
  13  * Re-worked by Ben Greear <greearb@candelatech.com>
  14  * ---
  15  */
  16 #include <linux/kernel.h>
  17 #include <linux/types.h>
  18 #include <linux/module.h>
  19 #include <linux/init.h>
  20 #include <linux/errno.h>
  21 #include <linux/slab.h>
  22 #include <linux/string.h>
  23 #include <linux/rculist.h>
  24 #include <linux/notifier.h>
  25 #include <linux/netdevice.h>
  26 #include <linux/etherdevice.h>
  27 #include <linux/ethtool.h>
  28 #include <linux/if_arp.h>
  29 #include <linux/if_vlan.h>
  30 #include <linux/if_link.h>
  31 #include <linux/if_macvlan.h>
  32 #include <linux/hash.h>
  33 #include <net/rtnetlink.h>
  34 #include <net/xfrm.h>
  35
  36 #define MACVLAN_HASH_SIZE       (1 << BITS_PER_BYTE)
  37
  38 struct macvlan_port {
  39         struct net_device       *dev;
  40         struct hlist_head       vlan_hash[MACVLAN_HASH_SIZE];
  41         struct list_head        vlans;
  42         struct rcu_head         rcu;
  43         bool                    passthru;
  44         int                     count;
  45 };
  46
  47 static void macvlan_port_destroy(struct net_device *dev);
  48
  49 static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev)
  50 {
  51         return rcu_dereference(dev->rx_handler_data);
  52 }
  53
  54 static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev)
  55 {
  56         return rtnl_dereference(dev->rx_handler_data);
  57 }
  58
  59 #define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT)
  60
  61 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
  62                                                const unsigned char *addr)
  63 {
  64         struct macvlan_dev *vlan;
  65
  66         hlist_for_each_entry_rcu(vlan, &port->vlan_hash[addr[5]], hlist) {
  67                 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr))
  68                         return vlan;
  69         }
  70         return NULL;
  71 }
  72
  73 static void macvlan_hash_add(struct macvlan_dev *vlan)
  74 {
  75         struct macvlan_port *port = vlan->port;
  76         const unsigned char *addr = vlan->dev->dev_addr;
  77
  78         hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]);
  79 }
  80
  81 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
  82 {
  83         hlist_del_rcu(&vlan->hlist);
  84         if (sync)
  85                 synchronize_rcu();
  86 }
  87
  88 static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
  89                                         const unsigned char *addr)
  90 {
  91         macvlan_hash_del(vlan, true);
  92         /* Now that we are unhashed it is safe to change the device
  93          * address without confusing packet delivery.
  94          */
  95         memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
  96         macvlan_hash_add(vlan);
  97 }
  98
  99 static int macvlan_addr_busy(const struct macvlan_port *port,
 100                                 const unsigned char *addr)
 101 {
 102         /* Test to see if the specified multicast address is
 103          * currently in use by the underlying device or
 104          * another macvlan.
 105          */
 106         if (ether_addr_equal_64bits(port->dev->dev_addr, addr))
 107                 return 1;
 108
 109         if (macvlan_hash_lookup(port, addr))
 110                 return 1;
 111
 112         return 0;
 113 }
 114
 115
 116 static int macvlan_broadcast_one(struct sk_buff *skb,
 117                                  const struct macvlan_dev *vlan,
 118                                  const struct ethhdr *eth, bool local)
 119 {
 120         struct net_device *dev = vlan->dev;
 121
 122         if (local)
 123                 return dev_forward_skb(dev, skb);
 124
 125         skb->dev = dev;
 126         if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
 127                 skb->pkt_type = PACKET_BROADCAST;
 128         else
 129                 skb->pkt_type = PACKET_MULTICAST;
 130
 131         return netif_rx(skb);
 132 }
 133
 134 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
 135 {
 136         return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT);
 137 }
 138
 139
 140 static unsigned int mc_hash(const struct macvlan_dev *vlan,
 141                             const unsigned char *addr)
 142 {
 143         u32 val = __get_unaligned_cpu32(addr + 2);
 144
 145         val ^= macvlan_hash_mix(vlan);
 146         return hash_32(val, MACVLAN_MC_FILTER_BITS);
 147 }
 148
 149 static void macvlan_broadcast(struct sk_buff *skb,
 150                               const struct macvlan_port *port,
 151                               struct net_device *src,
 152                               enum macvlan_mode mode)
 153 {
 154         const struct ethhdr *eth = eth_hdr(skb);
 155         const struct macvlan_dev *vlan;
 156         struct sk_buff *nskb;
 157         unsigned int i;
 158         int err;
 159         unsigned int hash;
 160
 161         if (skb->protocol == htons(ETH_P_PAUSE))
 162                 return;
 163
 164         for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
 165                 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) {
 166                         if (vlan->dev == src || !(vlan->mode & mode))
 167                                 continue;
 168
 169                         hash = mc_hash(vlan, eth->h_dest);
 170                         if (!test_bit(hash, vlan->mc_filter))
 171                                 continue;
 172
 173                         err = NET_RX_DROP;
 174                         nskb = skb_clone(skb, GFP_ATOMIC);
 175                         if (likely(nskb))
 176                                 err = macvlan_broadcast_one(
 177                                         nskb, vlan, eth,
 178                                         mode == MACVLAN_MODE_BRIDGE);
 179                         macvlan_count_rx(vlan, skb->len + ETH_HLEN,
 180                                          err == NET_RX_SUCCESS, 1);
 181                 }
 182         }
 183 }
 184
 185 /* called under rcu_read_lock() from netif_receive_skb */
 186 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
 187 {
 188         struct macvlan_port *port;
 189         struct sk_buff *skb = *pskb;
 190         const struct ethhdr *eth = eth_hdr(skb);
 191         const struct macvlan_dev *vlan;
 192         const struct macvlan_dev *src;
 193         struct net_device *dev;
 194         unsigned int len = 0;
 195         int ret = NET_RX_DROP;
 196
 197         port = macvlan_port_get_rcu(skb->dev);
 198         if (is_multicast_ether_addr(eth->h_dest)) {
 199                 skb = ip_check_defrag(skb, IP_DEFRAG_MACVLAN);
 200                 if (!skb)
 201                         return RX_HANDLER_CONSUMED;
 202                 eth = eth_hdr(skb);
 203                 src = macvlan_hash_lookup(port, eth->h_source);
 204                 if (!src)
 205                         /* frame comes from an external address */
 206                         macvlan_broadcast(skb, port, NULL,
 207                                           MACVLAN_MODE_PRIVATE |
 208                                           MACVLAN_MODE_VEPA    |
 209                                           MACVLAN_MODE_PASSTHRU|
 210                                           MACVLAN_MODE_BRIDGE);
 211                 else if (src->mode == MACVLAN_MODE_VEPA)
 212                         /* flood to everyone except source */
 213                         macvlan_broadcast(skb, port, src->dev,
 214                                           MACVLAN_MODE_VEPA |
 215                                           MACVLAN_MODE_BRIDGE);
 216                 else if (src->mode == MACVLAN_MODE_BRIDGE)
 217                         /*
 218                          * flood only to VEPA ports, bridge ports
 219                          * already saw the frame on the way out.
 220                          */
 221                         macvlan_broadcast(skb, port, src->dev,
 222                                           MACVLAN_MODE_VEPA);
 223                 else {
 224                         /* forward to original port. */
 225                         vlan = src;
 226                         ret = macvlan_broadcast_one(skb, vlan, eth, 0);
 227                         goto out;
 228                 }
 229
 230                 return RX_HANDLER_PASS;
 231         }
 232
 233         if (port->passthru)
 234                 vlan = list_first_or_null_rcu(&port->vlans,
 235                                               struct macvlan_dev, list);
 236         else
 237                 vlan = macvlan_hash_lookup(port, eth->h_dest);
 238         if (vlan == NULL)
 239                 return RX_HANDLER_PASS;
 240
 241         dev = vlan->dev;
 242         if (unlikely(!(dev->flags & IFF_UP))) {
 243                 kfree_skb(skb);
 244                 return RX_HANDLER_CONSUMED;
 245         }
 246         len = skb->len + ETH_HLEN;
 247         skb = skb_share_check(skb, GFP_ATOMIC);
 248         if (!skb)
 249                 goto out;
 250
 251         skb->dev = dev;
 252         skb->pkt_type = PACKET_HOST;
 253
 254         ret = netif_rx(skb);
 255
 256 out:
 257         macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0);
 258         return RX_HANDLER_CONSUMED;
 259 }
 260
 261 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
 262 {
 263         const struct macvlan_dev *vlan = netdev_priv(dev);
 264         const struct macvlan_port *port = vlan->port;
 265         const struct macvlan_dev *dest;
 266
 267         if (vlan->mode == MACVLAN_MODE_BRIDGE) {
 268                 const struct ethhdr *eth = (void *)skb->data;
 269
 270                 /* send to other bridge ports directly */
 271                 if (is_multicast_ether_addr(eth->h_dest)) {
 272                         macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
 273                         goto xmit_world;
 274                 }
 275
 276                 dest = macvlan_hash_lookup(port, eth->h_dest);
 277                 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
 278                         /* send to lowerdev first for its network taps */
 279                         dev_forward_skb(vlan->lowerdev, skb);
 280
 281                         return NET_XMIT_SUCCESS;
 282                 }
 283         }
 284
 285 xmit_world:
 286         skb->dev = vlan->lowerdev;
 287         return dev_queue_xmit(skb);
 288 }
 289
 290 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
 291                                       struct net_device *dev)
 292 {
 293         unsigned int len = skb->len;
 294         int ret;
 295         const struct macvlan_dev *vlan = netdev_priv(dev);
 296
 297         if (vlan->fwd_priv) {
 298                 skb->dev = vlan->lowerdev;
 299                 ret = dev_queue_xmit_accel(skb, vlan->fwd_priv);
 300         } else {
 301                 ret = macvlan_queue_xmit(skb, dev);
 302         }
 303
 304         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 305                 struct vlan_pcpu_stats *pcpu_stats;
 306
 307                 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
 308                 u64_stats_update_begin(&pcpu_stats->syncp);
 309                 pcpu_stats->tx_packets++;
 310                 pcpu_stats->tx_bytes += len;
 311                 u64_stats_update_end(&pcpu_stats->syncp);
 312         } else {
 313                 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
 314         }
 315         return ret;
 316 }
 317
 318 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
 319                                unsigned short type, const void *daddr,
 320                                const void *saddr, unsigned len)
 321 {
 322         const struct macvlan_dev *vlan = netdev_priv(dev);
 323         struct net_device *lowerdev = vlan->lowerdev;
 324
 325         return dev_hard_header(skb, lowerdev, type, daddr,
 326                                saddr ? : dev->dev_addr, len);
 327 }
 328
 329 static const struct header_ops macvlan_hard_header_ops = {
 330         .create         = macvlan_hard_header,
 331         .rebuild        = eth_rebuild_header,
 332         .parse          = eth_header_parse,
 333         .cache          = eth_header_cache,
 334         .cache_update   = eth_header_cache_update,
 335 };
 336
 337 static struct rtnl_link_ops macvlan_link_ops;
 338
 339 static int macvlan_open(struct net_device *dev)
 340 {
 341         struct macvlan_dev *vlan = netdev_priv(dev);
 342         struct net_device *lowerdev = vlan->lowerdev;
 343         int err;
 344
 345         if (vlan->port->passthru) {
 346                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
 347                         err = dev_set_promiscuity(lowerdev, 1);
 348                         if (err < 0)
 349                                 goto out;
 350                 }
 351                 goto hash_add;
 352         }
 353
 354         if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD &&
 355             dev->rtnl_link_ops == &macvlan_link_ops) {
 356                 vlan->fwd_priv =
 357                       lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
 358
 359                 /* If we get a NULL pointer back, or if we get an error
 360                  * then we should just fall through to the non accelerated path
 361                  */
 362                 if (IS_ERR_OR_NULL(vlan->fwd_priv)) {
 363                         vlan->fwd_priv = NULL;
 364                 } else
 365                         return 0;
 366         }
 367
 368         err = -EBUSY;
 369         if (macvlan_addr_busy(vlan->port, dev->dev_addr))
 370                 goto out;
 371
 372         err = dev_uc_add(lowerdev, dev->dev_addr);
 373         if (err < 0)
 374                 goto out;
 375         if (dev->flags & IFF_ALLMULTI) {
 376                 err = dev_set_allmulti(lowerdev, 1);
 377                 if (err < 0)
 378                         goto del_unicast;
 379         }
 380
 381 hash_add:
 382         macvlan_hash_add(vlan);
 383         return 0;
 384
 385 del_unicast:
 386         dev_uc_del(lowerdev, dev->dev_addr);
 387 out:
 388         if (vlan->fwd_priv) {
 389                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
 390                                                            vlan->fwd_priv);
 391                 vlan->fwd_priv = NULL;
 392         }
 393         return err;
 394 }
 395
 396 static int macvlan_stop(struct net_device *dev)
 397 {
 398         struct macvlan_dev *vlan = netdev_priv(dev);
 399         struct net_device *lowerdev = vlan->lowerdev;
 400
 401         if (vlan->fwd_priv) {
 402                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
 403                                                            vlan->fwd_priv);
 404                 vlan->fwd_priv = NULL;
 405                 return 0;
 406         }
 407
 408         dev_uc_unsync(lowerdev, dev);
 409         dev_mc_unsync(lowerdev, dev);
 410
 411         if (vlan->port->passthru) {
 412                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
 413                         dev_set_promiscuity(lowerdev, -1);
 414                 goto hash_del;
 415         }
 416
 417         if (dev->flags & IFF_ALLMULTI)
 418                 dev_set_allmulti(lowerdev, -1);
 419
 420         dev_uc_del(lowerdev, dev->dev_addr);
 421
 422 hash_del:
 423         macvlan_hash_del(vlan, !dev->dismantle);
 424         return 0;
 425 }
 426
 427 static int macvlan_set_mac_address(struct net_device *dev, void *p)
 428 {
 429         struct macvlan_dev *vlan = netdev_priv(dev);
 430         struct net_device *lowerdev = vlan->lowerdev;
 431         struct sockaddr *addr = p;
 432         int err;
 433
 434         if (!is_valid_ether_addr(addr->sa_data))
 435                 return -EADDRNOTAVAIL;
 436
 437         if (!(dev->flags & IFF_UP)) {
 438                 /* Just copy in the new address */
 439                 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 440         } else {
 441                 /* Rehash and update the device filters */
 442                 if (macvlan_addr_busy(vlan->port, addr->sa_data))
 443                         return -EBUSY;
 444
 445                 err = dev_uc_add(lowerdev, addr->sa_data);
 446                 if (err)
 447                         return err;
 448
 449                 dev_uc_del(lowerdev, dev->dev_addr);
 450
 451                 macvlan_hash_change_addr(vlan, addr->sa_data);
 452         }
 453         return 0;
 454 }
 455
 456 static void macvlan_change_rx_flags(struct net_device *dev, int change)
 457 {
 458         struct macvlan_dev *vlan = netdev_priv(dev);
 459         struct net_device *lowerdev = vlan->lowerdev;
 460
 461         if (dev->flags & IFF_UP) {
 462                 if (change & IFF_ALLMULTI)
 463                         dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 464         }
 465 }
 466
 467 static void macvlan_set_mac_lists(struct net_device *dev)
 468 {
 469         struct macvlan_dev *vlan = netdev_priv(dev);
 470
 471         if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
 472                 bitmap_fill(vlan->mc_filter, MACVLAN_MC_FILTER_SZ);
 473         } else {
 474                 struct netdev_hw_addr *ha;
 475                 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
 476
 477                 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
 478                 netdev_for_each_mc_addr(ha, dev) {
 479                         __set_bit(mc_hash(vlan, ha->addr), filter);
 480                 }
 481
 482                 __set_bit(mc_hash(vlan, dev->broadcast), filter);
 483
 484                 bitmap_copy(vlan->mc_filter, filter, MACVLAN_MC_FILTER_SZ);
 485         }
 486         dev_uc_sync(vlan->lowerdev, dev);
 487         dev_mc_sync(vlan->lowerdev, dev);
 488 }
 489
 490 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
 491 {
 492         struct macvlan_dev *vlan = netdev_priv(dev);
 493
 494         if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
 495                 return -EINVAL;
 496         dev->mtu = new_mtu;
 497         return 0;
 498 }
 499
 500 /*
 501  * macvlan network devices have devices nesting below it and are a special
 502  * "super class" of normal network devices; split their locks off into a
 503  * separate class since they always nest.
 504  */
 505 static struct lock_class_key macvlan_netdev_xmit_lock_key;
 506 static struct lock_class_key macvlan_netdev_addr_lock_key;
 507
 508 #define ALWAYS_ON_FEATURES \
 509         (NETIF_F_SG | NETIF_F_GEN_CSUM | NETIF_F_GSO_SOFTWARE | NETIF_F_LLTX)
 510
 511 #define MACVLAN_FEATURES \
 512         (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
 513          NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
 514          NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
 515          NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
 516
 517 #define MACVLAN_STATE_MASK \
 518         ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
 519
 520 static int macvlan_get_nest_level(struct net_device *dev)
 521 {
 522         return ((struct macvlan_dev *)netdev_priv(dev))->nest_level;
 523 }
 524
 525 static void macvlan_set_lockdep_class_one(struct net_device *dev,
 526                                           struct netdev_queue *txq,
 527                                           void *_unused)
 528 {
 529         lockdep_set_class(&txq->_xmit_lock,
 530                           &macvlan_netdev_xmit_lock_key);
 531 }
 532
 533 static void macvlan_set_lockdep_class(struct net_device *dev)
 534 {
 535         lockdep_set_class_and_subclass(&dev->addr_list_lock,
 536                                        &macvlan_netdev_addr_lock_key,
 537                                        macvlan_get_nest_level(dev));
 538         netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
 539 }
 540
 541 static int macvlan_init(struct net_device *dev)
 542 {
 543         struct macvlan_dev *vlan = netdev_priv(dev);
 544         const struct net_device *lowerdev = vlan->lowerdev;
 545         int i;
 546
 547         dev->state              = (dev->state & ~MACVLAN_STATE_MASK) |
 548                                   (lowerdev->state & MACVLAN_STATE_MASK);
 549         dev->features           = lowerdev->features & MACVLAN_FEATURES;
 550         dev->features           |= ALWAYS_ON_FEATURES;
 551         dev->gso_max_size       = lowerdev->gso_max_size;
 552         dev->iflink             = lowerdev->ifindex;
 553         dev->hard_header_len    = lowerdev->hard_header_len;
 554
 555         macvlan_set_lockdep_class(dev);
 556
 557         vlan->pcpu_stats = alloc_percpu(struct vlan_pcpu_stats);
 558         if (!vlan->pcpu_stats)
 559                 return -ENOMEM;
 560
 561         for_each_possible_cpu(i) {
 562                 struct vlan_pcpu_stats *mvlstats;
 563                 mvlstats = per_cpu_ptr(vlan->pcpu_stats, i);
 564                 u64_stats_init(&mvlstats->syncp);
 565         }
 566
 567         return 0;
 568 }
 569
 570 static void macvlan_uninit(struct net_device *dev)
 571 {
 572         struct macvlan_dev *vlan = netdev_priv(dev);
 573         struct macvlan_port *port = vlan->port;
 574
 575         free_percpu(vlan->pcpu_stats);
 576
 577         port->count -= 1;
 578         if (!port->count)
 579                 macvlan_port_destroy(port->dev);
 580 }
 581
 582 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
 583                                                          struct rtnl_link_stats64 *stats)
 584 {
 585         struct macvlan_dev *vlan = netdev_priv(dev);
 586
 587         if (vlan->pcpu_stats) {
 588                 struct vlan_pcpu_stats *p;
 589                 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
 590                 u32 rx_errors = 0, tx_dropped = 0;
 591                 unsigned int start;
 592                 int i;
 593
 594                 for_each_possible_cpu(i) {
 595                         p = per_cpu_ptr(vlan->pcpu_stats, i);
 596                         do {
 597                                 start = u64_stats_fetch_begin_bh(&p->syncp);
 598                                 rx_packets      = p->rx_packets;
 599                                 rx_bytes        = p->rx_bytes;
 600                                 rx_multicast    = p->rx_multicast;
 601                                 tx_packets      = p->tx_packets;
 602                                 tx_bytes        = p->tx_bytes;
 603                         } while (u64_stats_fetch_retry_bh(&p->syncp, start));
 604
 605                         stats->rx_packets       += rx_packets;
 606                         stats->rx_bytes         += rx_bytes;
 607                         stats->multicast        += rx_multicast;
 608                         stats->tx_packets       += tx_packets;
 609                         stats->tx_bytes         += tx_bytes;
 610                         /* rx_errors & tx_dropped are u32, updated
 611                          * without syncp protection.
 612                          */
 613                         rx_errors       += p->rx_errors;
 614                         tx_dropped      += p->tx_dropped;
 615                 }
 616                 stats->rx_errors        = rx_errors;
 617                 stats->rx_dropped       = rx_errors;
 618                 stats->tx_dropped       = tx_dropped;
 619         }
 620         return stats;
 621 }
 622
 623 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
 624                                    __be16 proto, u16 vid)
 625 {
 626         struct macvlan_dev *vlan = netdev_priv(dev);
 627         struct net_device *lowerdev = vlan->lowerdev;
 628
 629         return vlan_vid_add(lowerdev, proto, vid);
 630 }
 631
 632 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
 633                                     __be16 proto, u16 vid)
 634 {
 635         struct macvlan_dev *vlan = netdev_priv(dev);
 636         struct net_device *lowerdev = vlan->lowerdev;
 637
 638         vlan_vid_del(lowerdev, proto, vid);
 639         return 0;
 640 }
 641
 642 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 643                            struct net_device *dev,
 644                            const unsigned char *addr,
 645                            u16 flags)
 646 {
 647         struct macvlan_dev *vlan = netdev_priv(dev);
 648         int err = -EINVAL;
 649
 650         if (!vlan->port->passthru)
 651                 return -EOPNOTSUPP;
 652
 653         if (flags & NLM_F_REPLACE)
 654                 return -EOPNOTSUPP;
 655
 656         if (is_unicast_ether_addr(addr))
 657                 err = dev_uc_add_excl(dev, addr);
 658         else if (is_multicast_ether_addr(addr))
 659                 err = dev_mc_add_excl(dev, addr);
 660
 661         return err;
 662 }
 663
 664 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
 665                            struct net_device *dev,
 666                            const unsigned char *addr)
 667 {
 668         struct macvlan_dev *vlan = netdev_priv(dev);
 669         int err = -EINVAL;
 670
 671         if (!vlan->port->passthru)
 672                 return -EOPNOTSUPP;
 673
 674         if (is_unicast_ether_addr(addr))
 675                 err = dev_uc_del(dev, addr);
 676         else if (is_multicast_ether_addr(addr))
 677                 err = dev_mc_del(dev, addr);
 678
 679         return err;
 680 }
 681
 682 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
 683                                         struct ethtool_drvinfo *drvinfo)
 684 {
 685         strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
 686         strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
 687 }
 688
 689 static int macvlan_ethtool_get_settings(struct net_device *dev,
 690                                         struct ethtool_cmd *cmd)
 691 {
 692         const struct macvlan_dev *vlan = netdev_priv(dev);
 693
 694         return __ethtool_get_settings(vlan->lowerdev, cmd);
 695 }
 696
 697 static netdev_features_t macvlan_fix_features(struct net_device *dev,
 698                                               netdev_features_t features)
 699 {
 700         struct macvlan_dev *vlan = netdev_priv(dev);
 701         netdev_features_t mask;
 702
 703         features |= NETIF_F_ALL_FOR_ALL;
 704         features &= (vlan->set_features | ~MACVLAN_FEATURES);
 705         mask = features;
 706
 707         features = netdev_increment_features(vlan->lowerdev->features,
 708                                              features,
 709                                              mask);
 710         features |= ALWAYS_ON_FEATURES;
 711
 712         return features;
 713 }
 714
 715 static const struct ethtool_ops macvlan_ethtool_ops = {
 716         .get_link               = ethtool_op_get_link,
 717         .get_settings           = macvlan_ethtool_get_settings,
 718         .get_drvinfo            = macvlan_ethtool_get_drvinfo,
 719 };
 720
 721 static const struct net_device_ops macvlan_netdev_ops = {
 722         .ndo_init               = macvlan_init,
 723         .ndo_uninit             = macvlan_uninit,
 724         .ndo_open               = macvlan_open,
 725         .ndo_stop               = macvlan_stop,
 726         .ndo_start_xmit         = macvlan_start_xmit,
 727         .ndo_change_mtu         = macvlan_change_mtu,
 728         .ndo_fix_features       = macvlan_fix_features,
 729         .ndo_change_rx_flags    = macvlan_change_rx_flags,
 730         .ndo_set_mac_address    = macvlan_set_mac_address,
 731         .ndo_set_rx_mode        = macvlan_set_mac_lists,
 732         .ndo_get_stats64        = macvlan_dev_get_stats64,
 733         .ndo_validate_addr      = eth_validate_addr,
 734         .ndo_vlan_rx_add_vid    = macvlan_vlan_rx_add_vid,
 735         .ndo_vlan_rx_kill_vid   = macvlan_vlan_rx_kill_vid,
 736         .ndo_fdb_add            = macvlan_fdb_add,
 737         .ndo_fdb_del            = macvlan_fdb_del,
 738         .ndo_fdb_dump           = ndo_dflt_fdb_dump,
 739         .ndo_get_lock_subclass  = macvlan_get_nest_level,
 740 };
 741
 742 void macvlan_common_setup(struct net_device *dev)
 743 {
 744         ether_setup(dev);
 745
 746         dev->priv_flags        &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
 747         dev->priv_flags        |= IFF_UNICAST_FLT;
 748         dev->netdev_ops         = &macvlan_netdev_ops;
 749         dev->destructor         = free_netdev;
 750         dev->header_ops         = &macvlan_hard_header_ops;
 751         dev->ethtool_ops        = &macvlan_ethtool_ops;
 752 }
 753 EXPORT_SYMBOL_GPL(macvlan_common_setup);
 754
 755 static void macvlan_setup(struct net_device *dev)
 756 {
 757         macvlan_common_setup(dev);
 758         dev->tx_queue_len       = 0;
 759 }
 760
 761 static int macvlan_port_create(struct net_device *dev)
 762 {
 763         struct macvlan_port *port;
 764         unsigned int i;
 765         int err;
 766
 767         if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
 768                 return -EINVAL;
 769
 770         port = kzalloc(sizeof(*port), GFP_KERNEL);
 771         if (port == NULL)
 772                 return -ENOMEM;
 773
 774         port->passthru = false;
 775         port->dev = dev;
 776         INIT_LIST_HEAD(&port->vlans);
 777         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
 778                 INIT_HLIST_HEAD(&port->vlan_hash[i]);
 779
 780         err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
 781         if (err)
 782                 kfree(port);
 783         else
 784                 dev->priv_flags |= IFF_MACVLAN_PORT;
 785         return err;
 786 }
 787
 788 static void macvlan_port_destroy(struct net_device *dev)
 789 {
 790         struct macvlan_port *port = macvlan_port_get_rtnl(dev);
 791
 792         dev->priv_flags &= ~IFF_MACVLAN_PORT;
 793         netdev_rx_handler_unregister(dev);
 794         kfree_rcu(port, rcu);
 795 }
 796
 797 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
 798 {
 799         if (tb[IFLA_ADDRESS]) {
 800                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
 801                         return -EINVAL;
 802                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
 803                         return -EADDRNOTAVAIL;
 804         }
 805
 806         if (data && data[IFLA_MACVLAN_FLAGS] &&
 807             nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
 808                 return -EINVAL;
 809
 810         if (data && data[IFLA_MACVLAN_MODE]) {
 811                 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
 812                 case MACVLAN_MODE_PRIVATE:
 813                 case MACVLAN_MODE_VEPA:
 814                 case MACVLAN_MODE_BRIDGE:
 815                 case MACVLAN_MODE_PASSTHRU:
 816                         break;
 817                 default:
 818                         return -EINVAL;
 819                 }
 820         }
 821         return 0;
 822 }
 823
 824 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
 825                            struct nlattr *tb[], struct nlattr *data[])
 826 {
 827         struct macvlan_dev *vlan = netdev_priv(dev);
 828         struct macvlan_port *port;
 829         struct net_device *lowerdev;
 830         int err;
 831
 832         if (!tb[IFLA_LINK])
 833                 return -EINVAL;
 834
 835         lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
 836         if (lowerdev == NULL)
 837                 return -ENODEV;
 838
 839         /* When creating macvlans or macvtaps on top of other macvlans - use
 840          * the real device as the lowerdev.
 841          */
 842         if (netif_is_macvlan(lowerdev))
 843                 lowerdev = macvlan_dev_real_dev(lowerdev);
 844
 845         if (!tb[IFLA_MTU])
 846                 dev->mtu = lowerdev->mtu;
 847         else if (dev->mtu > lowerdev->mtu)
 848                 return -EINVAL;
 849
 850         if (!tb[IFLA_ADDRESS])
 851                 eth_hw_addr_random(dev);
 852
 853         if (!macvlan_port_exists(lowerdev)) {
 854                 err = macvlan_port_create(lowerdev);
 855                 if (err < 0)
 856                         return err;
 857         }
 858         port = macvlan_port_get_rtnl(lowerdev);
 859
 860         /* Only 1 macvlan device can be created in passthru mode */
 861         if (port->passthru)
 862                 return -EINVAL;
 863
 864         vlan->lowerdev = lowerdev;
 865         vlan->dev      = dev;
 866         vlan->port     = port;
 867         vlan->set_features = MACVLAN_FEATURES;
 868         vlan->nest_level = dev_get_nest_level(lowerdev, netif_is_macvlan) + 1;
 869
 870         vlan->mode     = MACVLAN_MODE_VEPA;
 871         if (data && data[IFLA_MACVLAN_MODE])
 872                 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
 873
 874         if (data && data[IFLA_MACVLAN_FLAGS])
 875                 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
 876
 877         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
 878                 if (port->count)
 879                         return -EINVAL;
 880                 port->passthru = true;
 881                 eth_hw_addr_inherit(dev, lowerdev);
 882         }
 883
 884         port->count += 1;
 885         err = register_netdevice(dev);
 886         if (err < 0)
 887                 goto destroy_port;
 888
 889         dev->priv_flags |= IFF_MACVLAN;
 890         err = netdev_upper_dev_link(lowerdev, dev);
 891         if (err)
 892                 goto unregister_netdev;
 893
 894         list_add_tail_rcu(&vlan->list, &port->vlans);
 895         netif_stacked_transfer_operstate(lowerdev, dev);
 896
 897         return 0;
 898
 899 unregister_netdev:
 900         unregister_netdevice(dev);
 901 destroy_port:
 902         port->count -= 1;
 903         if (!port->count)
 904                 macvlan_port_destroy(lowerdev);
 905
 906         return err;
 907 }
 908 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
 909
 910 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
 911                            struct nlattr *tb[], struct nlattr *data[])
 912 {
 913         return macvlan_common_newlink(src_net, dev, tb, data);
 914 }
 915
 916 void macvlan_dellink(struct net_device *dev, struct list_head *head)
 917 {
 918         struct macvlan_dev *vlan = netdev_priv(dev);
 919
 920         list_del_rcu(&vlan->list);
 921         unregister_netdevice_queue(dev, head);
 922         netdev_upper_dev_unlink(vlan->lowerdev, dev);
 923 }
 924 EXPORT_SYMBOL_GPL(macvlan_dellink);
 925
 926 static int macvlan_changelink(struct net_device *dev,
 927                 struct nlattr *tb[], struct nlattr *data[])
 928 {
 929         struct macvlan_dev *vlan = netdev_priv(dev);
 930         enum macvlan_mode mode;
 931         bool set_mode = false;
 932
 933         /* Validate mode, but don't set yet: setting flags may fail. */
 934         if (data && data[IFLA_MACVLAN_MODE]) {
 935                 set_mode = true;
 936                 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
 937                 /* Passthrough mode can't be set or cleared dynamically */
 938                 if ((mode == MACVLAN_MODE_PASSTHRU) !=
 939                     (vlan->mode == MACVLAN_MODE_PASSTHRU))
 940                         return -EINVAL;
 941         }
 942
 943         if (data && data[IFLA_MACVLAN_FLAGS]) {
 944                 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
 945                 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
 946                 if (vlan->port->passthru && promisc) {
 947                         int err;
 948
 949                         if (flags & MACVLAN_FLAG_NOPROMISC)
 950                                 err = dev_set_promiscuity(vlan->lowerdev, -1);
 951                         else
 952                                 err = dev_set_promiscuity(vlan->lowerdev, 1);
 953                         if (err < 0)
 954                                 return err;
 955                 }
 956                 vlan->flags = flags;
 957         }
 958         if (set_mode)
 959                 vlan->mode = mode;
 960         return 0;
 961 }
 962
 963 static size_t macvlan_get_size(const struct net_device *dev)
 964 {
 965         return (0
 966                 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
 967                 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
 968                 );
 969 }
 970
 971 static int macvlan_fill_info(struct sk_buff *skb,
 972                                 const struct net_device *dev)
 973 {
 974         struct macvlan_dev *vlan = netdev_priv(dev);
 975
 976         if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
 977                 goto nla_put_failure;
 978         if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
 979                 goto nla_put_failure;
 980         return 0;
 981
 982 nla_put_failure:
 983         return -EMSGSIZE;
 984 }
 985
 986 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
 987         [IFLA_MACVLAN_MODE]  = { .type = NLA_U32 },
 988         [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
 989 };
 990
 991 int macvlan_link_register(struct rtnl_link_ops *ops)
 992 {
 993         /* common fields */
 994         ops->priv_size          = sizeof(struct macvlan_dev);
 995         ops->validate           = macvlan_validate;
 996         ops->maxtype            = IFLA_MACVLAN_MAX;
 997         ops->policy             = macvlan_policy;
 998         ops->changelink         = macvlan_changelink;
 999         ops->get_size           = macvlan_get_size;
1000         ops->fill_info          = macvlan_fill_info;
1001
1002         return rtnl_link_register(ops);
1003 };
1004 EXPORT_SYMBOL_GPL(macvlan_link_register);
1005
1006 static struct rtnl_link_ops macvlan_link_ops = {
1007         .kind           = "macvlan",
1008         .setup          = macvlan_setup,
1009         .newlink        = macvlan_newlink,
1010         .dellink        = macvlan_dellink,
1011 };
1012
1013 static int macvlan_device_event(struct notifier_block *unused,
1014                                 unsigned long event, void *ptr)
1015 {
1016         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1017         struct macvlan_dev *vlan, *next;
1018         struct macvlan_port *port;
1019         LIST_HEAD(list_kill);
1020
1021         if (!macvlan_port_exists(dev))
1022                 return NOTIFY_DONE;
1023
1024         port = macvlan_port_get_rtnl(dev);
1025
1026         switch (event) {
1027         case NETDEV_CHANGE:
1028                 list_for_each_entry(vlan, &port->vlans, list)
1029                         netif_stacked_transfer_operstate(vlan->lowerdev,
1030                                                          vlan->dev);
1031                 break;
1032         case NETDEV_FEAT_CHANGE:
1033                 list_for_each_entry(vlan, &port->vlans, list) {
1034                         vlan->dev->gso_max_size = dev->gso_max_size;
1035                         netdev_update_features(vlan->dev);
1036                 }
1037                 break;
1038         case NETDEV_UNREGISTER:
1039                 /* twiddle thumbs on netns device moves */
1040                 if (dev->reg_state != NETREG_UNREGISTERING)
1041                         break;
1042
1043                 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1044                         vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1045                 unregister_netdevice_many(&list_kill);
1046                 break;
1047         case NETDEV_PRE_TYPE_CHANGE:
1048                 /* Forbid underlaying device to change its type. */
1049                 return NOTIFY_BAD;
1050         }
1051         return NOTIFY_DONE;
1052 }
1053
1054 static struct notifier_block macvlan_notifier_block __read_mostly = {
1055         .notifier_call  = macvlan_device_event,
1056 };
1057
1058 static int __init macvlan_init_module(void)
1059 {
1060         int err;
1061
1062         register_netdevice_notifier(&macvlan_notifier_block);
1063
1064         err = macvlan_link_register(&macvlan_link_ops);
1065         if (err < 0)
1066                 goto err1;
1067         return 0;
1068 err1:
1069         unregister_netdevice_notifier(&macvlan_notifier_block);
1070         return err;
1071 }
1072
1073 static void __exit macvlan_cleanup_module(void)
1074 {
1075         rtnl_link_unregister(&macvlan_link_ops);
1076         unregister_netdevice_notifier(&macvlan_notifier_block);
1077 }
1078
1079 module_init(macvlan_init_module);
1080 module_exit(macvlan_cleanup_module);
1081
1082 MODULE_LICENSE("GPL");
1083 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1084 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1085 MODULE_ALIAS_RTNL_LINK("macvlan");