Pileus Git - ~andy/linux/blob - 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         __u8 ip_summed = skb->ip_summed;
 267
 268         if (vlan->mode == MACVLAN_MODE_BRIDGE) {
 269                 const struct ethhdr *eth = (void *)skb->data;
 270                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 271
 272                 /* send to other bridge ports directly */
 273                 if (is_multicast_ether_addr(eth->h_dest)) {
 274                         macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
 275                         goto xmit_world;
 276                 }
 277
 278                 dest = macvlan_hash_lookup(port, eth->h_dest);
 279                 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
 280                         /* send to lowerdev first for its network taps */
 281                         dev_forward_skb(vlan->lowerdev, skb);
 282
 283                         return NET_XMIT_SUCCESS;
 284                 }
 285         }
 286
 287 xmit_world:
 288         skb->ip_summed = ip_summed;
 289         skb->dev = vlan->lowerdev;
 290         return dev_queue_xmit(skb);
 291 }
 292
 293 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
 294                                       struct net_device *dev)
 295 {
 296         unsigned int len = skb->len;
 297         int ret;
 298         const struct macvlan_dev *vlan = netdev_priv(dev);
 299
 300         if (vlan->fwd_priv) {
 301                 skb->dev = vlan->lowerdev;
 302                 ret = dev_hard_start_xmit(skb, skb->dev, NULL, vlan->fwd_priv);
 303         } else {
 304                 ret = macvlan_queue_xmit(skb, dev);
 305         }
 306
 307         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 308                 struct macvlan_pcpu_stats *pcpu_stats;
 309
 310                 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
 311                 u64_stats_update_begin(&pcpu_stats->syncp);
 312                 pcpu_stats->tx_packets++;
 313                 pcpu_stats->tx_bytes += len;
 314                 u64_stats_update_end(&pcpu_stats->syncp);
 315         } else {
 316                 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
 317         }
 318         return ret;
 319 }
 320
 321 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
 322                                unsigned short type, const void *daddr,
 323                                const void *saddr, unsigned len)
 324 {
 325         const struct macvlan_dev *vlan = netdev_priv(dev);
 326         struct net_device *lowerdev = vlan->lowerdev;
 327
 328         return dev_hard_header(skb, lowerdev, type, daddr,
 329                                saddr ? : dev->dev_addr, len);
 330 }
 331
 332 static const struct header_ops macvlan_hard_header_ops = {
 333         .create         = macvlan_hard_header,
 334         .rebuild        = eth_rebuild_header,
 335         .parse          = eth_header_parse,
 336         .cache          = eth_header_cache,
 337         .cache_update   = eth_header_cache_update,
 338 };
 339
 340 static int macvlan_open(struct net_device *dev)
 341 {
 342         struct macvlan_dev *vlan = netdev_priv(dev);
 343         struct net_device *lowerdev = vlan->lowerdev;
 344         int err;
 345
 346         if (vlan->port->passthru) {
 347                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
 348                         err = dev_set_promiscuity(lowerdev, 1);
 349                         if (err < 0)
 350                                 goto out;
 351                 }
 352                 goto hash_add;
 353         }
 354
 355         if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD) {
 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                         dev->features &= ~NETIF_F_LLTX;
 366                         return 0;
 367                 }
 368         }
 369
 370         err = -EBUSY;
 371         if (macvlan_addr_busy(vlan->port, dev->dev_addr))
 372                 goto out;
 373
 374         err = dev_uc_add(lowerdev, dev->dev_addr);
 375         if (err < 0)
 376                 goto out;
 377         if (dev->flags & IFF_ALLMULTI) {
 378                 err = dev_set_allmulti(lowerdev, 1);
 379                 if (err < 0)
 380                         goto del_unicast;
 381         }
 382
 383 hash_add:
 384         macvlan_hash_add(vlan);
 385         return 0;
 386
 387 del_unicast:
 388         dev_uc_del(lowerdev, dev->dev_addr);
 389 out:
 390         if (vlan->fwd_priv) {
 391                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
 392                                                            vlan->fwd_priv);
 393                 vlan->fwd_priv = NULL;
 394         }
 395         return err;
 396 }
 397
 398 static int macvlan_stop(struct net_device *dev)
 399 {
 400         struct macvlan_dev *vlan = netdev_priv(dev);
 401         struct net_device *lowerdev = vlan->lowerdev;
 402
 403         if (vlan->fwd_priv) {
 404                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
 405                                                            vlan->fwd_priv);
 406                 vlan->fwd_priv = NULL;
 407                 return 0;
 408         }
 409
 410         dev_uc_unsync(lowerdev, dev);
 411         dev_mc_unsync(lowerdev, dev);
 412
 413         if (vlan->port->passthru) {
 414                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
 415                         dev_set_promiscuity(lowerdev, -1);
 416                 goto hash_del;
 417         }
 418
 419         if (dev->flags & IFF_ALLMULTI)
 420                 dev_set_allmulti(lowerdev, -1);
 421
 422         dev_uc_del(lowerdev, dev->dev_addr);
 423
 424 hash_del:
 425         macvlan_hash_del(vlan, !dev->dismantle);
 426         return 0;
 427 }
 428
 429 static int macvlan_set_mac_address(struct net_device *dev, void *p)
 430 {
 431         struct macvlan_dev *vlan = netdev_priv(dev);
 432         struct net_device *lowerdev = vlan->lowerdev;
 433         struct sockaddr *addr = p;
 434         int err;
 435
 436         if (!is_valid_ether_addr(addr->sa_data))
 437                 return -EADDRNOTAVAIL;
 438
 439         if (!(dev->flags & IFF_UP)) {
 440                 /* Just copy in the new address */
 441                 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 442         } else {
 443                 /* Rehash and update the device filters */
 444                 if (macvlan_addr_busy(vlan->port, addr->sa_data))
 445                         return -EBUSY;
 446
 447                 err = dev_uc_add(lowerdev, addr->sa_data);
 448                 if (err)
 449                         return err;
 450
 451                 dev_uc_del(lowerdev, dev->dev_addr);
 452
 453                 macvlan_hash_change_addr(vlan, addr->sa_data);
 454         }
 455         return 0;
 456 }
 457
 458 static void macvlan_change_rx_flags(struct net_device *dev, int change)
 459 {
 460         struct macvlan_dev *vlan = netdev_priv(dev);
 461         struct net_device *lowerdev = vlan->lowerdev;
 462
 463         if (change & IFF_ALLMULTI)
 464                 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 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 MACVLAN_FEATURES \
 509         (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
 510          NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
 511          NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
 512          NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
 513
 514 #define MACVLAN_STATE_MASK \
 515         ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
 516
 517 static void macvlan_set_lockdep_class_one(struct net_device *dev,
 518                                           struct netdev_queue *txq,
 519                                           void *_unused)
 520 {
 521         lockdep_set_class(&txq->_xmit_lock,
 522                           &macvlan_netdev_xmit_lock_key);
 523 }
 524
 525 static void macvlan_set_lockdep_class(struct net_device *dev)
 526 {
 527         lockdep_set_class(&dev->addr_list_lock,
 528                           &macvlan_netdev_addr_lock_key);
 529         netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
 530 }
 531
 532 static int macvlan_init(struct net_device *dev)
 533 {
 534         struct macvlan_dev *vlan = netdev_priv(dev);
 535         const struct net_device *lowerdev = vlan->lowerdev;
 536         int i;
 537
 538         dev->state              = (dev->state & ~MACVLAN_STATE_MASK) |
 539                                   (lowerdev->state & MACVLAN_STATE_MASK);
 540         dev->features           = lowerdev->features & MACVLAN_FEATURES;
 541         dev->features           |= NETIF_F_LLTX;
 542         dev->gso_max_size       = lowerdev->gso_max_size;
 543         dev->iflink             = lowerdev->ifindex;
 544         dev->hard_header_len    = lowerdev->hard_header_len;
 545
 546         macvlan_set_lockdep_class(dev);
 547
 548         vlan->pcpu_stats = alloc_percpu(struct macvlan_pcpu_stats);
 549         if (!vlan->pcpu_stats)
 550                 return -ENOMEM;
 551
 552         for_each_possible_cpu(i) {
 553                 struct macvlan_pcpu_stats *mvlstats;
 554                 mvlstats = per_cpu_ptr(vlan->pcpu_stats, i);
 555                 u64_stats_init(&mvlstats->syncp);
 556         }
 557
 558         return 0;
 559 }
 560
 561 static void macvlan_uninit(struct net_device *dev)
 562 {
 563         struct macvlan_dev *vlan = netdev_priv(dev);
 564         struct macvlan_port *port = vlan->port;
 565
 566         free_percpu(vlan->pcpu_stats);
 567
 568         port->count -= 1;
 569         if (!port->count)
 570                 macvlan_port_destroy(port->dev);
 571 }
 572
 573 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
 574                                                          struct rtnl_link_stats64 *stats)
 575 {
 576         struct macvlan_dev *vlan = netdev_priv(dev);
 577
 578         if (vlan->pcpu_stats) {
 579                 struct macvlan_pcpu_stats *p;
 580                 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
 581                 u32 rx_errors = 0, tx_dropped = 0;
 582                 unsigned int start;
 583                 int i;
 584
 585                 for_each_possible_cpu(i) {
 586                         p = per_cpu_ptr(vlan->pcpu_stats, i);
 587                         do {
 588                                 start = u64_stats_fetch_begin_bh(&p->syncp);
 589                                 rx_packets      = p->rx_packets;
 590                                 rx_bytes        = p->rx_bytes;
 591                                 rx_multicast    = p->rx_multicast;
 592                                 tx_packets      = p->tx_packets;
 593                                 tx_bytes        = p->tx_bytes;
 594                         } while (u64_stats_fetch_retry_bh(&p->syncp, start));
 595
 596                         stats->rx_packets       += rx_packets;
 597                         stats->rx_bytes         += rx_bytes;
 598                         stats->multicast        += rx_multicast;
 599                         stats->tx_packets       += tx_packets;
 600                         stats->tx_bytes         += tx_bytes;
 601                         /* rx_errors & tx_dropped are u32, updated
 602                          * without syncp protection.
 603                          */
 604                         rx_errors       += p->rx_errors;
 605                         tx_dropped      += p->tx_dropped;
 606                 }
 607                 stats->rx_errors        = rx_errors;
 608                 stats->rx_dropped       = rx_errors;
 609                 stats->tx_dropped       = tx_dropped;
 610         }
 611         return stats;
 612 }
 613
 614 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
 615                                    __be16 proto, u16 vid)
 616 {
 617         struct macvlan_dev *vlan = netdev_priv(dev);
 618         struct net_device *lowerdev = vlan->lowerdev;
 619
 620         return vlan_vid_add(lowerdev, proto, vid);
 621 }
 622
 623 static int macvlan_vlan_rx_kill_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         vlan_vid_del(lowerdev, proto, vid);
 630         return 0;
 631 }
 632
 633 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 634                            struct net_device *dev,
 635                            const unsigned char *addr,
 636                            u16 flags)
 637 {
 638         struct macvlan_dev *vlan = netdev_priv(dev);
 639         int err = -EINVAL;
 640
 641         if (!vlan->port->passthru)
 642                 return -EOPNOTSUPP;
 643
 644         if (flags & NLM_F_REPLACE)
 645                 return -EOPNOTSUPP;
 646
 647         if (is_unicast_ether_addr(addr))
 648                 err = dev_uc_add_excl(dev, addr);
 649         else if (is_multicast_ether_addr(addr))
 650                 err = dev_mc_add_excl(dev, addr);
 651
 652         return err;
 653 }
 654
 655 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
 656                            struct net_device *dev,
 657                            const unsigned char *addr)
 658 {
 659         struct macvlan_dev *vlan = netdev_priv(dev);
 660         int err = -EINVAL;
 661
 662         if (!vlan->port->passthru)
 663                 return -EOPNOTSUPP;
 664
 665         if (is_unicast_ether_addr(addr))
 666                 err = dev_uc_del(dev, addr);
 667         else if (is_multicast_ether_addr(addr))
 668                 err = dev_mc_del(dev, addr);
 669
 670         return err;
 671 }
 672
 673 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
 674                                         struct ethtool_drvinfo *drvinfo)
 675 {
 676         strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
 677         strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
 678 }
 679
 680 static int macvlan_ethtool_get_settings(struct net_device *dev,
 681                                         struct ethtool_cmd *cmd)
 682 {
 683         const struct macvlan_dev *vlan = netdev_priv(dev);
 684
 685         return __ethtool_get_settings(vlan->lowerdev, cmd);
 686 }
 687
 688 static netdev_features_t macvlan_fix_features(struct net_device *dev,
 689                                               netdev_features_t features)
 690 {
 691         struct macvlan_dev *vlan = netdev_priv(dev);
 692
 693         return features & (vlan->set_features | ~MACVLAN_FEATURES);
 694 }
 695
 696 static const struct ethtool_ops macvlan_ethtool_ops = {
 697         .get_link               = ethtool_op_get_link,
 698         .get_settings           = macvlan_ethtool_get_settings,
 699         .get_drvinfo            = macvlan_ethtool_get_drvinfo,
 700 };
 701
 702 static const struct net_device_ops macvlan_netdev_ops = {
 703         .ndo_init               = macvlan_init,
 704         .ndo_uninit             = macvlan_uninit,
 705         .ndo_open               = macvlan_open,
 706         .ndo_stop               = macvlan_stop,
 707         .ndo_start_xmit         = macvlan_start_xmit,
 708         .ndo_change_mtu         = macvlan_change_mtu,
 709         .ndo_fix_features       = macvlan_fix_features,
 710         .ndo_change_rx_flags    = macvlan_change_rx_flags,
 711         .ndo_set_mac_address    = macvlan_set_mac_address,
 712         .ndo_set_rx_mode        = macvlan_set_mac_lists,
 713         .ndo_get_stats64        = macvlan_dev_get_stats64,
 714         .ndo_validate_addr      = eth_validate_addr,
 715         .ndo_vlan_rx_add_vid    = macvlan_vlan_rx_add_vid,
 716         .ndo_vlan_rx_kill_vid   = macvlan_vlan_rx_kill_vid,
 717         .ndo_fdb_add            = macvlan_fdb_add,
 718         .ndo_fdb_del            = macvlan_fdb_del,
 719         .ndo_fdb_dump           = ndo_dflt_fdb_dump,
 720 };
 721
 722 void macvlan_common_setup(struct net_device *dev)
 723 {
 724         ether_setup(dev);
 725
 726         dev->priv_flags        &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
 727         dev->priv_flags        |= IFF_UNICAST_FLT;
 728         dev->netdev_ops         = &macvlan_netdev_ops;
 729         dev->destructor         = free_netdev;
 730         dev->header_ops         = &macvlan_hard_header_ops;
 731         dev->ethtool_ops        = &macvlan_ethtool_ops;
 732 }
 733 EXPORT_SYMBOL_GPL(macvlan_common_setup);
 734
 735 static void macvlan_setup(struct net_device *dev)
 736 {
 737         macvlan_common_setup(dev);
 738         dev->tx_queue_len       = 0;
 739 }
 740
 741 static int macvlan_port_create(struct net_device *dev)
 742 {
 743         struct macvlan_port *port;
 744         unsigned int i;
 745         int err;
 746
 747         if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
 748                 return -EINVAL;
 749
 750         port = kzalloc(sizeof(*port), GFP_KERNEL);
 751         if (port == NULL)
 752                 return -ENOMEM;
 753
 754         port->passthru = false;
 755         port->dev = dev;
 756         INIT_LIST_HEAD(&port->vlans);
 757         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
 758                 INIT_HLIST_HEAD(&port->vlan_hash[i]);
 759
 760         err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
 761         if (err)
 762                 kfree(port);
 763         else
 764                 dev->priv_flags |= IFF_MACVLAN_PORT;
 765         return err;
 766 }
 767
 768 static void macvlan_port_destroy(struct net_device *dev)
 769 {
 770         struct macvlan_port *port = macvlan_port_get_rtnl(dev);
 771
 772         dev->priv_flags &= ~IFF_MACVLAN_PORT;
 773         netdev_rx_handler_unregister(dev);
 774         kfree_rcu(port, rcu);
 775 }
 776
 777 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
 778 {
 779         if (tb[IFLA_ADDRESS]) {
 780                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
 781                         return -EINVAL;
 782                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
 783                         return -EADDRNOTAVAIL;
 784         }
 785
 786         if (data && data[IFLA_MACVLAN_FLAGS] &&
 787             nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
 788                 return -EINVAL;
 789
 790         if (data && data[IFLA_MACVLAN_MODE]) {
 791                 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
 792                 case MACVLAN_MODE_PRIVATE:
 793                 case MACVLAN_MODE_VEPA:
 794                 case MACVLAN_MODE_BRIDGE:
 795                 case MACVLAN_MODE_PASSTHRU:
 796                         break;
 797                 default:
 798                         return -EINVAL;
 799                 }
 800         }
 801         return 0;
 802 }
 803
 804 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
 805                            struct nlattr *tb[], struct nlattr *data[])
 806 {
 807         struct macvlan_dev *vlan = netdev_priv(dev);
 808         struct macvlan_port *port;
 809         struct net_device *lowerdev;
 810         int err;
 811
 812         if (!tb[IFLA_LINK])
 813                 return -EINVAL;
 814
 815         lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
 816         if (lowerdev == NULL)
 817                 return -ENODEV;
 818
 819         /* When creating macvlans or macvtaps on top of other macvlans - use
 820          * the real device as the lowerdev.
 821          */
 822         if (netif_is_macvlan(lowerdev))
 823                 lowerdev = macvlan_dev_real_dev(lowerdev);
 824
 825         if (!tb[IFLA_MTU])
 826                 dev->mtu = lowerdev->mtu;
 827         else if (dev->mtu > lowerdev->mtu)
 828                 return -EINVAL;
 829
 830         if (!tb[IFLA_ADDRESS])
 831                 eth_hw_addr_random(dev);
 832
 833         if (!macvlan_port_exists(lowerdev)) {
 834                 err = macvlan_port_create(lowerdev);
 835                 if (err < 0)
 836                         return err;
 837         }
 838         port = macvlan_port_get_rtnl(lowerdev);
 839
 840         /* Only 1 macvlan device can be created in passthru mode */
 841         if (port->passthru)
 842                 return -EINVAL;
 843
 844         vlan->lowerdev = lowerdev;
 845         vlan->dev      = dev;
 846         vlan->port     = port;
 847         vlan->set_features = MACVLAN_FEATURES;
 848
 849         vlan->mode     = MACVLAN_MODE_VEPA;
 850         if (data && data[IFLA_MACVLAN_MODE])
 851                 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
 852
 853         if (data && data[IFLA_MACVLAN_FLAGS])
 854                 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
 855
 856         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
 857                 if (port->count)
 858                         return -EINVAL;
 859                 port->passthru = true;
 860                 eth_hw_addr_inherit(dev, lowerdev);
 861         }
 862
 863         port->count += 1;
 864         err = register_netdevice(dev);
 865         if (err < 0)
 866                 goto destroy_port;
 867
 868         dev->priv_flags |= IFF_MACVLAN;
 869         err = netdev_upper_dev_link(lowerdev, dev);
 870         if (err)
 871                 goto destroy_port;
 872
 873
 874         list_add_tail_rcu(&vlan->list, &port->vlans);
 875         netif_stacked_transfer_operstate(lowerdev, dev);
 876
 877         return 0;
 878
 879 destroy_port:
 880         port->count -= 1;
 881         if (!port->count)
 882                 macvlan_port_destroy(lowerdev);
 883
 884         return err;
 885 }
 886 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
 887
 888 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
 889                            struct nlattr *tb[], struct nlattr *data[])
 890 {
 891         return macvlan_common_newlink(src_net, dev, tb, data);
 892 }
 893
 894 void macvlan_dellink(struct net_device *dev, struct list_head *head)
 895 {
 896         struct macvlan_dev *vlan = netdev_priv(dev);
 897
 898         list_del_rcu(&vlan->list);
 899         unregister_netdevice_queue(dev, head);
 900         netdev_upper_dev_unlink(vlan->lowerdev, dev);
 901 }
 902 EXPORT_SYMBOL_GPL(macvlan_dellink);
 903
 904 static int macvlan_changelink(struct net_device *dev,
 905                 struct nlattr *tb[], struct nlattr *data[])
 906 {
 907         struct macvlan_dev *vlan = netdev_priv(dev);
 908         enum macvlan_mode mode;
 909         bool set_mode = false;
 910
 911         /* Validate mode, but don't set yet: setting flags may fail. */
 912         if (data && data[IFLA_MACVLAN_MODE]) {
 913                 set_mode = true;
 914                 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
 915                 /* Passthrough mode can't be set or cleared dynamically */
 916                 if ((mode == MACVLAN_MODE_PASSTHRU) !=
 917                     (vlan->mode == MACVLAN_MODE_PASSTHRU))
 918                         return -EINVAL;
 919         }
 920
 921         if (data && data[IFLA_MACVLAN_FLAGS]) {
 922                 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
 923                 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
 924                 if (vlan->port->passthru && promisc) {
 925                         int err;
 926
 927                         if (flags & MACVLAN_FLAG_NOPROMISC)
 928                                 err = dev_set_promiscuity(vlan->lowerdev, -1);
 929                         else
 930                                 err = dev_set_promiscuity(vlan->lowerdev, 1);
 931                         if (err < 0)
 932                                 return err;
 933                 }
 934                 vlan->flags = flags;
 935         }
 936         if (set_mode)
 937                 vlan->mode = mode;
 938         return 0;
 939 }
 940
 941 static size_t macvlan_get_size(const struct net_device *dev)
 942 {
 943         return (0
 944                 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
 945                 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
 946                 );
 947 }
 948
 949 static int macvlan_fill_info(struct sk_buff *skb,
 950                                 const struct net_device *dev)
 951 {
 952         struct macvlan_dev *vlan = netdev_priv(dev);
 953
 954         if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
 955                 goto nla_put_failure;
 956         if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
 957                 goto nla_put_failure;
 958         return 0;
 959
 960 nla_put_failure:
 961         return -EMSGSIZE;
 962 }
 963
 964 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
 965         [IFLA_MACVLAN_MODE]  = { .type = NLA_U32 },
 966         [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
 967 };
 968
 969 int macvlan_link_register(struct rtnl_link_ops *ops)
 970 {
 971         /* common fields */
 972         ops->priv_size          = sizeof(struct macvlan_dev);
 973         ops->validate           = macvlan_validate;
 974         ops->maxtype            = IFLA_MACVLAN_MAX;
 975         ops->policy             = macvlan_policy;
 976         ops->changelink         = macvlan_changelink;
 977         ops->get_size           = macvlan_get_size;
 978         ops->fill_info          = macvlan_fill_info;
 979
 980         return rtnl_link_register(ops);
 981 };
 982 EXPORT_SYMBOL_GPL(macvlan_link_register);
 983
 984 static struct rtnl_link_ops macvlan_link_ops = {
 985         .kind           = "macvlan",
 986         .setup          = macvlan_setup,
 987         .newlink        = macvlan_newlink,
 988         .dellink        = macvlan_dellink,
 989 };
 990
 991 static int macvlan_device_event(struct notifier_block *unused,
 992                                 unsigned long event, void *ptr)
 993 {
 994         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 995         struct macvlan_dev *vlan, *next;
 996         struct macvlan_port *port;
 997         LIST_HEAD(list_kill);
 998
 999         if (!macvlan_port_exists(dev))
1000                 return NOTIFY_DONE;
1001
1002         port = macvlan_port_get_rtnl(dev);
1003
1004         switch (event) {
1005         case NETDEV_CHANGE:
1006                 list_for_each_entry(vlan, &port->vlans, list)
1007                         netif_stacked_transfer_operstate(vlan->lowerdev,
1008                                                          vlan->dev);
1009                 break;
1010         case NETDEV_FEAT_CHANGE:
1011                 list_for_each_entry(vlan, &port->vlans, list) {
1012                         vlan->dev->features = dev->features & MACVLAN_FEATURES;
1013                         vlan->dev->gso_max_size = dev->gso_max_size;
1014                         netdev_features_change(vlan->dev);
1015                 }
1016                 break;
1017         case NETDEV_UNREGISTER:
1018                 /* twiddle thumbs on netns device moves */
1019                 if (dev->reg_state != NETREG_UNREGISTERING)
1020                         break;
1021
1022                 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1023                         vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1024                 unregister_netdevice_many(&list_kill);
1025                 list_del(&list_kill);
1026                 break;
1027         case NETDEV_PRE_TYPE_CHANGE:
1028                 /* Forbid underlaying device to change its type. */
1029                 return NOTIFY_BAD;
1030         }
1031         return NOTIFY_DONE;
1032 }
1033
1034 static struct notifier_block macvlan_notifier_block __read_mostly = {
1035         .notifier_call  = macvlan_device_event,
1036 };
1037
1038 static int __init macvlan_init_module(void)
1039 {
1040         int err;
1041
1042         register_netdevice_notifier(&macvlan_notifier_block);
1043
1044         err = macvlan_link_register(&macvlan_link_ops);
1045         if (err < 0)
1046                 goto err1;
1047         return 0;
1048 err1:
1049         unregister_netdevice_notifier(&macvlan_notifier_block);
1050         return err;
1051 }
1052
1053 static void __exit macvlan_cleanup_module(void)
1054 {
1055         rtnl_link_unregister(&macvlan_link_ops);
1056         unregister_netdevice_notifier(&macvlan_notifier_block);
1057 }
1058
1059 module_init(macvlan_init_module);
1060 module_exit(macvlan_cleanup_module);
1061
1062 MODULE_LICENSE("GPL");
1063 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1064 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1065 MODULE_ALIAS_RTNL_LINK("macvlan");