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 <linux/workqueue.h>
  34 #include <net/rtnetlink.h>
  35 #include <net/xfrm.h>
  36 #include <linux/netpoll.h>
  37
  38 #define MACVLAN_HASH_BITS       8
  39 #define MACVLAN_HASH_SIZE       (1<<MACVLAN_HASH_BITS)
  40 #define MACVLAN_BC_QUEUE_LEN    1000
  41
  42 struct macvlan_port {
  43         struct net_device       *dev;
  44         struct hlist_head       vlan_hash[MACVLAN_HASH_SIZE];
  45         struct list_head        vlans;
  46         struct rcu_head         rcu;
  47         struct sk_buff_head     bc_queue;
  48         struct work_struct      bc_work;
  49         bool                    passthru;
  50         int                     count;
  51         struct hlist_head       vlan_source_hash[MACVLAN_HASH_SIZE];
  52 };
  53
  54 struct macvlan_source_entry {
  55         struct hlist_node       hlist;
  56         struct macvlan_dev      *vlan;
  57         unsigned char           addr[6+2] __aligned(sizeof(u16));
  58         struct rcu_head         rcu;
  59 };
  60
  61 struct macvlan_skb_cb {
  62         const struct macvlan_dev *src;
  63 };
  64
  65 #define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0]))
  66
  67 static void macvlan_port_destroy(struct net_device *dev);
  68
  69 /* Hash Ethernet address */
  70 static u32 macvlan_eth_hash(const unsigned char *addr)
  71 {
  72         u64 value = get_unaligned((u64 *)addr);
  73
  74         /* only want 6 bytes */
  75 #ifdef __BIG_ENDIAN
  76         value >>= 16;
  77 #else
  78         value <<= 16;
  79 #endif
  80         return hash_64(value, MACVLAN_HASH_BITS);
  81 }
  82
  83 static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev)
  84 {
  85         return rcu_dereference(dev->rx_handler_data);
  86 }
  87
  88 static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev)
  89 {
  90         return rtnl_dereference(dev->rx_handler_data);
  91 }
  92
  93 #define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT)
  94
  95 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
  96                                                const unsigned char *addr)
  97 {
  98         struct macvlan_dev *vlan;
  99         u32 idx = macvlan_eth_hash(addr);
 100
 101         hlist_for_each_entry_rcu(vlan, &port->vlan_hash[idx], hlist) {
 102                 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr))
 103                         return vlan;
 104         }
 105         return NULL;
 106 }
 107
 108 static struct macvlan_source_entry *macvlan_hash_lookup_source(
 109         const struct macvlan_dev *vlan,
 110         const unsigned char *addr)
 111 {
 112         struct macvlan_source_entry *entry;
 113         u32 idx = macvlan_eth_hash(addr);
 114         struct hlist_head *h = &vlan->port->vlan_source_hash[idx];
 115
 116         hlist_for_each_entry_rcu(entry, h, hlist) {
 117                 if (ether_addr_equal_64bits(entry->addr, addr) &&
 118                     entry->vlan == vlan)
 119                         return entry;
 120         }
 121         return NULL;
 122 }
 123
 124 static int macvlan_hash_add_source(struct macvlan_dev *vlan,
 125                                    const unsigned char *addr)
 126 {
 127         struct macvlan_port *port = vlan->port;
 128         struct macvlan_source_entry *entry;
 129         struct hlist_head *h;
 130
 131         entry = macvlan_hash_lookup_source(vlan, addr);
 132         if (entry)
 133                 return 0;
 134
 135         entry = kmalloc(sizeof(*entry), GFP_KERNEL);
 136         if (!entry)
 137                 return -ENOMEM;
 138
 139         ether_addr_copy(entry->addr, addr);
 140         entry->vlan = vlan;
 141         h = &port->vlan_source_hash[macvlan_eth_hash(addr)];
 142         hlist_add_head_rcu(&entry->hlist, h);
 143         vlan->macaddr_count++;
 144
 145         return 0;
 146 }
 147
 148 static void macvlan_hash_add(struct macvlan_dev *vlan)
 149 {
 150         struct macvlan_port *port = vlan->port;
 151         const unsigned char *addr = vlan->dev->dev_addr;
 152         u32 idx = macvlan_eth_hash(addr);
 153
 154         hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[idx]);
 155 }
 156
 157 static void macvlan_hash_del_source(struct macvlan_source_entry *entry)
 158 {
 159         hlist_del_rcu(&entry->hlist);
 160         kfree_rcu(entry, rcu);
 161 }
 162
 163 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
 164 {
 165         hlist_del_rcu(&vlan->hlist);
 166         if (sync)
 167                 synchronize_rcu();
 168 }
 169
 170 static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
 171                                         const unsigned char *addr)
 172 {
 173         macvlan_hash_del(vlan, true);
 174         /* Now that we are unhashed it is safe to change the device
 175          * address without confusing packet delivery.
 176          */
 177         memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
 178         macvlan_hash_add(vlan);
 179 }
 180
 181 static int macvlan_addr_busy(const struct macvlan_port *port,
 182                                 const unsigned char *addr)
 183 {
 184         /* Test to see if the specified multicast address is
 185          * currently in use by the underlying device or
 186          * another macvlan.
 187          */
 188         if (ether_addr_equal_64bits(port->dev->dev_addr, addr))
 189                 return 1;
 190
 191         if (macvlan_hash_lookup(port, addr))
 192                 return 1;
 193
 194         return 0;
 195 }
 196
 197
 198 static int macvlan_broadcast_one(struct sk_buff *skb,
 199                                  const struct macvlan_dev *vlan,
 200                                  const struct ethhdr *eth, bool local)
 201 {
 202         struct net_device *dev = vlan->dev;
 203
 204         if (local)
 205                 return __dev_forward_skb(dev, skb);
 206
 207         skb->dev = dev;
 208         if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
 209                 skb->pkt_type = PACKET_BROADCAST;
 210         else
 211                 skb->pkt_type = PACKET_MULTICAST;
 212
 213         return 0;
 214 }
 215
 216 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
 217 {
 218         return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT);
 219 }
 220
 221
 222 static unsigned int mc_hash(const struct macvlan_dev *vlan,
 223                             const unsigned char *addr)
 224 {
 225         u32 val = __get_unaligned_cpu32(addr + 2);
 226
 227         val ^= macvlan_hash_mix(vlan);
 228         return hash_32(val, MACVLAN_MC_FILTER_BITS);
 229 }
 230
 231 static void macvlan_broadcast(struct sk_buff *skb,
 232                               const struct macvlan_port *port,
 233                               struct net_device *src,
 234                               enum macvlan_mode mode)
 235 {
 236         const struct ethhdr *eth = eth_hdr(skb);
 237         const struct macvlan_dev *vlan;
 238         struct sk_buff *nskb;
 239         unsigned int i;
 240         int err;
 241         unsigned int hash;
 242
 243         if (skb->protocol == htons(ETH_P_PAUSE))
 244                 return;
 245
 246         for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
 247                 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) {
 248                         if (vlan->dev == src || !(vlan->mode & mode))
 249                                 continue;
 250
 251                         hash = mc_hash(vlan, eth->h_dest);
 252                         if (!test_bit(hash, vlan->mc_filter))
 253                                 continue;
 254
 255                         err = NET_RX_DROP;
 256                         nskb = skb_clone(skb, GFP_ATOMIC);
 257                         if (likely(nskb))
 258                                 err = macvlan_broadcast_one(
 259                                         nskb, vlan, eth,
 260                                         mode == MACVLAN_MODE_BRIDGE) ?:
 261                                       netif_rx_ni(nskb);
 262                         macvlan_count_rx(vlan, skb->len + ETH_HLEN,
 263                                          err == NET_RX_SUCCESS, 1);
 264                 }
 265         }
 266 }
 267
 268 static void macvlan_process_broadcast(struct work_struct *w)
 269 {
 270         struct macvlan_port *port = container_of(w, struct macvlan_port,
 271                                                  bc_work);
 272         struct sk_buff *skb;
 273         struct sk_buff_head list;
 274
 275         skb_queue_head_init(&list);
 276
 277         spin_lock_bh(&port->bc_queue.lock);
 278         skb_queue_splice_tail_init(&port->bc_queue, &list);
 279         spin_unlock_bh(&port->bc_queue.lock);
 280
 281         while ((skb = __skb_dequeue(&list))) {
 282                 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
 283
 284                 rcu_read_lock();
 285
 286                 if (!src)
 287                         /* frame comes from an external address */
 288                         macvlan_broadcast(skb, port, NULL,
 289                                           MACVLAN_MODE_PRIVATE |
 290                                           MACVLAN_MODE_VEPA    |
 291                                           MACVLAN_MODE_PASSTHRU|
 292                                           MACVLAN_MODE_BRIDGE);
 293                 else if (src->mode == MACVLAN_MODE_VEPA)
 294                         /* flood to everyone except source */
 295                         macvlan_broadcast(skb, port, src->dev,
 296                                           MACVLAN_MODE_VEPA |
 297                                           MACVLAN_MODE_BRIDGE);
 298                 else
 299                         /*
 300                          * flood only to VEPA ports, bridge ports
 301                          * already saw the frame on the way out.
 302                          */
 303                         macvlan_broadcast(skb, port, src->dev,
 304                                           MACVLAN_MODE_VEPA);
 305
 306                 rcu_read_unlock();
 307
 308                 kfree_skb(skb);
 309         }
 310 }
 311
 312 static void macvlan_broadcast_enqueue(struct macvlan_port *port,
 313                                       struct sk_buff *skb)
 314 {
 315         struct sk_buff *nskb;
 316         int err = -ENOMEM;
 317
 318         nskb = skb_clone(skb, GFP_ATOMIC);
 319         if (!nskb)
 320                 goto err;
 321
 322         spin_lock(&port->bc_queue.lock);
 323         if (skb_queue_len(&port->bc_queue) < MACVLAN_BC_QUEUE_LEN) {
 324                 __skb_queue_tail(&port->bc_queue, nskb);
 325                 err = 0;
 326         }
 327         spin_unlock(&port->bc_queue.lock);
 328
 329         if (err)
 330                 goto free_nskb;
 331
 332         schedule_work(&port->bc_work);
 333         return;
 334
 335 free_nskb:
 336         kfree_skb(nskb);
 337 err:
 338         atomic_long_inc(&skb->dev->rx_dropped);
 339 }
 340
 341 static void macvlan_flush_sources(struct macvlan_port *port,
 342                                   struct macvlan_dev *vlan)
 343 {
 344         int i;
 345
 346         for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
 347                 struct hlist_node *h, *n;
 348
 349                 hlist_for_each_safe(h, n, &port->vlan_source_hash[i]) {
 350                         struct macvlan_source_entry *entry;
 351
 352                         entry = hlist_entry(h, struct macvlan_source_entry,
 353                                             hlist);
 354                         if (entry->vlan == vlan)
 355                                 macvlan_hash_del_source(entry);
 356                 }
 357         }
 358         vlan->macaddr_count = 0;
 359 }
 360
 361 static void macvlan_forward_source_one(struct sk_buff *skb,
 362                                        struct macvlan_dev *vlan)
 363 {
 364         struct sk_buff *nskb;
 365         struct net_device *dev;
 366         int len;
 367         int ret;
 368
 369         dev = vlan->dev;
 370         if (unlikely(!(dev->flags & IFF_UP)))
 371                 return;
 372
 373         nskb = skb_clone(skb, GFP_ATOMIC);
 374         if (!nskb)
 375                 return;
 376
 377         len = nskb->len + ETH_HLEN;
 378         nskb->dev = dev;
 379         nskb->pkt_type = PACKET_HOST;
 380
 381         ret = netif_rx(nskb);
 382         macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0);
 383 }
 384
 385 static void macvlan_forward_source(struct sk_buff *skb,
 386                                    struct macvlan_port *port,
 387                                    const unsigned char *addr)
 388 {
 389         struct macvlan_source_entry *entry;
 390         u32 idx = macvlan_eth_hash(addr);
 391         struct hlist_head *h = &port->vlan_source_hash[idx];
 392
 393         hlist_for_each_entry_rcu(entry, h, hlist) {
 394                 if (ether_addr_equal_64bits(entry->addr, addr))
 395                         if (entry->vlan->dev->flags & IFF_UP)
 396                                 macvlan_forward_source_one(skb, entry->vlan);
 397         }
 398 }
 399
 400 /* called under rcu_read_lock() from netif_receive_skb */
 401 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
 402 {
 403         struct macvlan_port *port;
 404         struct sk_buff *skb = *pskb;
 405         const struct ethhdr *eth = eth_hdr(skb);
 406         const struct macvlan_dev *vlan;
 407         const struct macvlan_dev *src;
 408         struct net_device *dev;
 409         unsigned int len = 0;
 410         int ret = NET_RX_DROP;
 411
 412         port = macvlan_port_get_rcu(skb->dev);
 413         if (is_multicast_ether_addr(eth->h_dest)) {
 414                 skb = ip_check_defrag(skb, IP_DEFRAG_MACVLAN);
 415                 if (!skb)
 416                         return RX_HANDLER_CONSUMED;
 417                 eth = eth_hdr(skb);
 418                 macvlan_forward_source(skb, port, eth->h_source);
 419                 src = macvlan_hash_lookup(port, eth->h_source);
 420                 if (src && src->mode != MACVLAN_MODE_VEPA &&
 421                     src->mode != MACVLAN_MODE_BRIDGE) {
 422                         /* forward to original port. */
 423                         vlan = src;
 424                         ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
 425                               netif_rx(skb);
 426                         goto out;
 427                 }
 428
 429                 MACVLAN_SKB_CB(skb)->src = src;
 430                 macvlan_broadcast_enqueue(port, skb);
 431
 432                 return RX_HANDLER_PASS;
 433         }
 434
 435         macvlan_forward_source(skb, port, eth->h_source);
 436         if (port->passthru)
 437                 vlan = list_first_or_null_rcu(&port->vlans,
 438                                               struct macvlan_dev, list);
 439         else
 440                 vlan = macvlan_hash_lookup(port, eth->h_dest);
 441         if (vlan == NULL)
 442                 return RX_HANDLER_PASS;
 443
 444         dev = vlan->dev;
 445         if (unlikely(!(dev->flags & IFF_UP))) {
 446                 kfree_skb(skb);
 447                 return RX_HANDLER_CONSUMED;
 448         }
 449         len = skb->len + ETH_HLEN;
 450         skb = skb_share_check(skb, GFP_ATOMIC);
 451         if (!skb)
 452                 goto out;
 453
 454         skb->dev = dev;
 455         skb->pkt_type = PACKET_HOST;
 456
 457         ret = netif_rx(skb);
 458
 459 out:
 460         macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0);
 461         return RX_HANDLER_CONSUMED;
 462 }
 463
 464 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
 465 {
 466         const struct macvlan_dev *vlan = netdev_priv(dev);
 467         const struct macvlan_port *port = vlan->port;
 468         const struct macvlan_dev *dest;
 469
 470         if (vlan->mode == MACVLAN_MODE_BRIDGE) {
 471                 const struct ethhdr *eth = (void *)skb->data;
 472
 473                 /* send to other bridge ports directly */
 474                 if (is_multicast_ether_addr(eth->h_dest)) {
 475                         macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
 476                         goto xmit_world;
 477                 }
 478
 479                 dest = macvlan_hash_lookup(port, eth->h_dest);
 480                 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
 481                         /* send to lowerdev first for its network taps */
 482                         dev_forward_skb(vlan->lowerdev, skb);
 483
 484                         return NET_XMIT_SUCCESS;
 485                 }
 486         }
 487
 488 xmit_world:
 489         skb->dev = vlan->lowerdev;
 490         return dev_queue_xmit(skb);
 491 }
 492
 493 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
 494 {
 495 #ifdef CONFIG_NET_POLL_CONTROLLER
 496         if (vlan->netpoll)
 497                 netpoll_send_skb(vlan->netpoll, skb);
 498 #else
 499         BUG();
 500 #endif
 501         return NETDEV_TX_OK;
 502 }
 503
 504 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
 505                                       struct net_device *dev)
 506 {
 507         unsigned int len = skb->len;
 508         int ret;
 509         struct macvlan_dev *vlan = netdev_priv(dev);
 510
 511         if (unlikely(netpoll_tx_running(dev)))
 512                 return macvlan_netpoll_send_skb(vlan, skb);
 513
 514         if (vlan->fwd_priv) {
 515                 skb->dev = vlan->lowerdev;
 516                 ret = dev_queue_xmit_accel(skb, vlan->fwd_priv);
 517         } else {
 518                 ret = macvlan_queue_xmit(skb, dev);
 519         }
 520
 521         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 522                 struct vlan_pcpu_stats *pcpu_stats;
 523
 524                 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
 525                 u64_stats_update_begin(&pcpu_stats->syncp);
 526                 pcpu_stats->tx_packets++;
 527                 pcpu_stats->tx_bytes += len;
 528                 u64_stats_update_end(&pcpu_stats->syncp);
 529         } else {
 530                 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
 531         }
 532         return ret;
 533 }
 534
 535 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
 536                                unsigned short type, const void *daddr,
 537                                const void *saddr, unsigned len)
 538 {
 539         const struct macvlan_dev *vlan = netdev_priv(dev);
 540         struct net_device *lowerdev = vlan->lowerdev;
 541
 542         return dev_hard_header(skb, lowerdev, type, daddr,
 543                                saddr ? : dev->dev_addr, len);
 544 }
 545
 546 static const struct header_ops macvlan_hard_header_ops = {
 547         .create         = macvlan_hard_header,
 548         .rebuild        = eth_rebuild_header,
 549         .parse          = eth_header_parse,
 550         .cache          = eth_header_cache,
 551         .cache_update   = eth_header_cache_update,
 552 };
 553
 554 static struct rtnl_link_ops macvlan_link_ops;
 555
 556 static int macvlan_open(struct net_device *dev)
 557 {
 558         struct macvlan_dev *vlan = netdev_priv(dev);
 559         struct net_device *lowerdev = vlan->lowerdev;
 560         int err;
 561
 562         if (vlan->port->passthru) {
 563                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
 564                         err = dev_set_promiscuity(lowerdev, 1);
 565                         if (err < 0)
 566                                 goto out;
 567                 }
 568                 goto hash_add;
 569         }
 570
 571         if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD &&
 572             dev->rtnl_link_ops == &macvlan_link_ops) {
 573                 vlan->fwd_priv =
 574                       lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
 575
 576                 /* If we get a NULL pointer back, or if we get an error
 577                  * then we should just fall through to the non accelerated path
 578                  */
 579                 if (IS_ERR_OR_NULL(vlan->fwd_priv)) {
 580                         vlan->fwd_priv = NULL;
 581                 } else
 582                         return 0;
 583         }
 584
 585         err = -EBUSY;
 586         if (macvlan_addr_busy(vlan->port, dev->dev_addr))
 587                 goto out;
 588
 589         err = dev_uc_add(lowerdev, dev->dev_addr);
 590         if (err < 0)
 591                 goto out;
 592         if (dev->flags & IFF_ALLMULTI) {
 593                 err = dev_set_allmulti(lowerdev, 1);
 594                 if (err < 0)
 595                         goto del_unicast;
 596         }
 597
 598 hash_add:
 599         macvlan_hash_add(vlan);
 600         return 0;
 601
 602 del_unicast:
 603         dev_uc_del(lowerdev, dev->dev_addr);
 604 out:
 605         if (vlan->fwd_priv) {
 606                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
 607                                                            vlan->fwd_priv);
 608                 vlan->fwd_priv = NULL;
 609         }
 610         return err;
 611 }
 612
 613 static int macvlan_stop(struct net_device *dev)
 614 {
 615         struct macvlan_dev *vlan = netdev_priv(dev);
 616         struct net_device *lowerdev = vlan->lowerdev;
 617
 618         if (vlan->fwd_priv) {
 619                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
 620                                                            vlan->fwd_priv);
 621                 vlan->fwd_priv = NULL;
 622                 return 0;
 623         }
 624
 625         dev_uc_unsync(lowerdev, dev);
 626         dev_mc_unsync(lowerdev, dev);
 627
 628         if (vlan->port->passthru) {
 629                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
 630                         dev_set_promiscuity(lowerdev, -1);
 631                 goto hash_del;
 632         }
 633
 634         if (dev->flags & IFF_ALLMULTI)
 635                 dev_set_allmulti(lowerdev, -1);
 636
 637         dev_uc_del(lowerdev, dev->dev_addr);
 638
 639 hash_del:
 640         macvlan_hash_del(vlan, !dev->dismantle);
 641         return 0;
 642 }
 643
 644 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
 645 {
 646         struct macvlan_dev *vlan = netdev_priv(dev);
 647         struct net_device *lowerdev = vlan->lowerdev;
 648         int err;
 649
 650         if (!(dev->flags & IFF_UP)) {
 651                 /* Just copy in the new address */
 652                 ether_addr_copy(dev->dev_addr, addr);
 653         } else {
 654                 /* Rehash and update the device filters */
 655                 if (macvlan_addr_busy(vlan->port, addr))
 656                         return -EBUSY;
 657
 658                 if (!vlan->port->passthru) {
 659                         err = dev_uc_add(lowerdev, addr);
 660                         if (err)
 661                                 return err;
 662
 663                         dev_uc_del(lowerdev, dev->dev_addr);
 664                 }
 665
 666                 macvlan_hash_change_addr(vlan, addr);
 667         }
 668         return 0;
 669 }
 670
 671 static int macvlan_set_mac_address(struct net_device *dev, void *p)
 672 {
 673         struct macvlan_dev *vlan = netdev_priv(dev);
 674         struct sockaddr *addr = p;
 675
 676         if (!is_valid_ether_addr(addr->sa_data))
 677                 return -EADDRNOTAVAIL;
 678
 679         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
 680                 dev_set_mac_address(vlan->lowerdev, addr);
 681                 return 0;
 682         }
 683
 684         return macvlan_sync_address(dev, addr->sa_data);
 685 }
 686
 687 static void macvlan_change_rx_flags(struct net_device *dev, int change)
 688 {
 689         struct macvlan_dev *vlan = netdev_priv(dev);
 690         struct net_device *lowerdev = vlan->lowerdev;
 691
 692         if (dev->flags & IFF_UP) {
 693                 if (change & IFF_ALLMULTI)
 694                         dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 695         }
 696 }
 697
 698 static void macvlan_set_mac_lists(struct net_device *dev)
 699 {
 700         struct macvlan_dev *vlan = netdev_priv(dev);
 701
 702         if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
 703                 bitmap_fill(vlan->mc_filter, MACVLAN_MC_FILTER_SZ);
 704         } else {
 705                 struct netdev_hw_addr *ha;
 706                 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
 707
 708                 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
 709                 netdev_for_each_mc_addr(ha, dev) {
 710                         __set_bit(mc_hash(vlan, ha->addr), filter);
 711                 }
 712
 713                 __set_bit(mc_hash(vlan, dev->broadcast), filter);
 714
 715                 bitmap_copy(vlan->mc_filter, filter, MACVLAN_MC_FILTER_SZ);
 716         }
 717         dev_uc_sync(vlan->lowerdev, dev);
 718         dev_mc_sync(vlan->lowerdev, dev);
 719 }
 720
 721 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
 722 {
 723         struct macvlan_dev *vlan = netdev_priv(dev);
 724
 725         if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
 726                 return -EINVAL;
 727         dev->mtu = new_mtu;
 728         return 0;
 729 }
 730
 731 /*
 732  * macvlan network devices have devices nesting below it and are a special
 733  * "super class" of normal network devices; split their locks off into a
 734  * separate class since they always nest.
 735  */
 736 static struct lock_class_key macvlan_netdev_xmit_lock_key;
 737 static struct lock_class_key macvlan_netdev_addr_lock_key;
 738
 739 #define ALWAYS_ON_FEATURES \
 740         (NETIF_F_SG | NETIF_F_GEN_CSUM | NETIF_F_GSO_SOFTWARE | NETIF_F_LLTX)
 741
 742 #define MACVLAN_FEATURES \
 743         (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
 744          NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
 745          NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
 746          NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
 747
 748 #define MACVLAN_STATE_MASK \
 749         ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
 750
 751 static int macvlan_get_nest_level(struct net_device *dev)
 752 {
 753         return ((struct macvlan_dev *)netdev_priv(dev))->nest_level;
 754 }
 755
 756 static void macvlan_set_lockdep_class_one(struct net_device *dev,
 757                                           struct netdev_queue *txq,
 758                                           void *_unused)
 759 {
 760         lockdep_set_class(&txq->_xmit_lock,
 761                           &macvlan_netdev_xmit_lock_key);
 762 }
 763
 764 static void macvlan_set_lockdep_class(struct net_device *dev)
 765 {
 766         lockdep_set_class_and_subclass(&dev->addr_list_lock,
 767                                        &macvlan_netdev_addr_lock_key,
 768                                        macvlan_get_nest_level(dev));
 769         netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
 770 }
 771
 772 static int macvlan_init(struct net_device *dev)
 773 {
 774         struct macvlan_dev *vlan = netdev_priv(dev);
 775         const struct net_device *lowerdev = vlan->lowerdev;
 776
 777         dev->state              = (dev->state & ~MACVLAN_STATE_MASK) |
 778                                   (lowerdev->state & MACVLAN_STATE_MASK);
 779         dev->features           = lowerdev->features & MACVLAN_FEATURES;
 780         dev->features           |= ALWAYS_ON_FEATURES;
 781         dev->vlan_features      = lowerdev->vlan_features & MACVLAN_FEATURES;
 782         dev->gso_max_size       = lowerdev->gso_max_size;
 783         dev->iflink             = lowerdev->ifindex;
 784         dev->hard_header_len    = lowerdev->hard_header_len;
 785
 786         macvlan_set_lockdep_class(dev);
 787
 788         vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
 789         if (!vlan->pcpu_stats)
 790                 return -ENOMEM;
 791
 792         return 0;
 793 }
 794
 795 static void macvlan_uninit(struct net_device *dev)
 796 {
 797         struct macvlan_dev *vlan = netdev_priv(dev);
 798         struct macvlan_port *port = vlan->port;
 799
 800         free_percpu(vlan->pcpu_stats);
 801
 802         macvlan_flush_sources(port, vlan);
 803         port->count -= 1;
 804         if (!port->count)
 805                 macvlan_port_destroy(port->dev);
 806 }
 807
 808 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
 809                                                          struct rtnl_link_stats64 *stats)
 810 {
 811         struct macvlan_dev *vlan = netdev_priv(dev);
 812
 813         if (vlan->pcpu_stats) {
 814                 struct vlan_pcpu_stats *p;
 815                 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
 816                 u32 rx_errors = 0, tx_dropped = 0;
 817                 unsigned int start;
 818                 int i;
 819
 820                 for_each_possible_cpu(i) {
 821                         p = per_cpu_ptr(vlan->pcpu_stats, i);
 822                         do {
 823                                 start = u64_stats_fetch_begin_irq(&p->syncp);
 824                                 rx_packets      = p->rx_packets;
 825                                 rx_bytes        = p->rx_bytes;
 826                                 rx_multicast    = p->rx_multicast;
 827                                 tx_packets      = p->tx_packets;
 828                                 tx_bytes        = p->tx_bytes;
 829                         } while (u64_stats_fetch_retry_irq(&p->syncp, start));
 830
 831                         stats->rx_packets       += rx_packets;
 832                         stats->rx_bytes         += rx_bytes;
 833                         stats->multicast        += rx_multicast;
 834                         stats->tx_packets       += tx_packets;
 835                         stats->tx_bytes         += tx_bytes;
 836                         /* rx_errors & tx_dropped are u32, updated
 837                          * without syncp protection.
 838                          */
 839                         rx_errors       += p->rx_errors;
 840                         tx_dropped      += p->tx_dropped;
 841                 }
 842                 stats->rx_errors        = rx_errors;
 843                 stats->rx_dropped       = rx_errors;
 844                 stats->tx_dropped       = tx_dropped;
 845         }
 846         return stats;
 847 }
 848
 849 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
 850                                    __be16 proto, u16 vid)
 851 {
 852         struct macvlan_dev *vlan = netdev_priv(dev);
 853         struct net_device *lowerdev = vlan->lowerdev;
 854
 855         return vlan_vid_add(lowerdev, proto, vid);
 856 }
 857
 858 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
 859                                     __be16 proto, u16 vid)
 860 {
 861         struct macvlan_dev *vlan = netdev_priv(dev);
 862         struct net_device *lowerdev = vlan->lowerdev;
 863
 864         vlan_vid_del(lowerdev, proto, vid);
 865         return 0;
 866 }
 867
 868 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 869                            struct net_device *dev,
 870                            const unsigned char *addr,
 871                            u16 flags)
 872 {
 873         struct macvlan_dev *vlan = netdev_priv(dev);
 874         int err = -EINVAL;
 875
 876         /* Support unicast filter only on passthru devices.
 877          * Multicast filter should be allowed on all devices.
 878          */
 879         if (!vlan->port->passthru && is_unicast_ether_addr(addr))
 880                 return -EOPNOTSUPP;
 881
 882         if (flags & NLM_F_REPLACE)
 883                 return -EOPNOTSUPP;
 884
 885         if (is_unicast_ether_addr(addr))
 886                 err = dev_uc_add_excl(dev, addr);
 887         else if (is_multicast_ether_addr(addr))
 888                 err = dev_mc_add_excl(dev, addr);
 889
 890         return err;
 891 }
 892
 893 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
 894                            struct net_device *dev,
 895                            const unsigned char *addr)
 896 {
 897         struct macvlan_dev *vlan = netdev_priv(dev);
 898         int err = -EINVAL;
 899
 900         /* Support unicast filter only on passthru devices.
 901          * Multicast filter should be allowed on all devices.
 902          */
 903         if (!vlan->port->passthru && is_unicast_ether_addr(addr))
 904                 return -EOPNOTSUPP;
 905
 906         if (is_unicast_ether_addr(addr))
 907                 err = dev_uc_del(dev, addr);
 908         else if (is_multicast_ether_addr(addr))
 909                 err = dev_mc_del(dev, addr);
 910
 911         return err;
 912 }
 913
 914 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
 915                                         struct ethtool_drvinfo *drvinfo)
 916 {
 917         strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
 918         strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
 919 }
 920
 921 static int macvlan_ethtool_get_settings(struct net_device *dev,
 922                                         struct ethtool_cmd *cmd)
 923 {
 924         const struct macvlan_dev *vlan = netdev_priv(dev);
 925
 926         return __ethtool_get_settings(vlan->lowerdev, cmd);
 927 }
 928
 929 static netdev_features_t macvlan_fix_features(struct net_device *dev,
 930                                               netdev_features_t features)
 931 {
 932         struct macvlan_dev *vlan = netdev_priv(dev);
 933         netdev_features_t mask;
 934
 935         features |= NETIF_F_ALL_FOR_ALL;
 936         features &= (vlan->set_features | ~MACVLAN_FEATURES);
 937         mask = features;
 938
 939         features = netdev_increment_features(vlan->lowerdev->features,
 940                                              features,
 941                                              mask);
 942         features |= ALWAYS_ON_FEATURES;
 943         features &= ~NETIF_F_NETNS_LOCAL;
 944
 945         return features;
 946 }
 947
 948 #ifdef CONFIG_NET_POLL_CONTROLLER
 949 static void macvlan_dev_poll_controller(struct net_device *dev)
 950 {
 951         return;
 952 }
 953
 954 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
 955 {
 956         struct macvlan_dev *vlan = netdev_priv(dev);
 957         struct net_device *real_dev = vlan->lowerdev;
 958         struct netpoll *netpoll;
 959         int err = 0;
 960
 961         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 962         err = -ENOMEM;
 963         if (!netpoll)
 964                 goto out;
 965
 966         err = __netpoll_setup(netpoll, real_dev);
 967         if (err) {
 968                 kfree(netpoll);
 969                 goto out;
 970         }
 971
 972         vlan->netpoll = netpoll;
 973
 974 out:
 975         return err;
 976 }
 977
 978 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
 979 {
 980         struct macvlan_dev *vlan = netdev_priv(dev);
 981         struct netpoll *netpoll = vlan->netpoll;
 982
 983         if (!netpoll)
 984                 return;
 985
 986         vlan->netpoll = NULL;
 987
 988         __netpoll_free_async(netpoll);
 989 }
 990 #endif  /* CONFIG_NET_POLL_CONTROLLER */
 991
 992 static const struct ethtool_ops macvlan_ethtool_ops = {
 993         .get_link               = ethtool_op_get_link,
 994         .get_settings           = macvlan_ethtool_get_settings,
 995         .get_drvinfo            = macvlan_ethtool_get_drvinfo,
 996 };
 997
 998 static const struct net_device_ops macvlan_netdev_ops = {
 999         .ndo_init               = macvlan_init,
1000         .ndo_uninit             = macvlan_uninit,
1001         .ndo_open               = macvlan_open,
1002         .ndo_stop               = macvlan_stop,
1003         .ndo_start_xmit         = macvlan_start_xmit,
1004         .ndo_change_mtu         = macvlan_change_mtu,
1005         .ndo_fix_features       = macvlan_fix_features,
1006         .ndo_change_rx_flags    = macvlan_change_rx_flags,
1007         .ndo_set_mac_address    = macvlan_set_mac_address,
1008         .ndo_set_rx_mode        = macvlan_set_mac_lists,
1009         .ndo_get_stats64        = macvlan_dev_get_stats64,
1010         .ndo_validate_addr      = eth_validate_addr,
1011         .ndo_vlan_rx_add_vid    = macvlan_vlan_rx_add_vid,
1012         .ndo_vlan_rx_kill_vid   = macvlan_vlan_rx_kill_vid,
1013         .ndo_fdb_add            = macvlan_fdb_add,
1014         .ndo_fdb_del            = macvlan_fdb_del,
1015         .ndo_fdb_dump           = ndo_dflt_fdb_dump,
1016         .ndo_get_lock_subclass  = macvlan_get_nest_level,
1017 #ifdef CONFIG_NET_POLL_CONTROLLER
1018         .ndo_poll_controller    = macvlan_dev_poll_controller,
1019         .ndo_netpoll_setup      = macvlan_dev_netpoll_setup,
1020         .ndo_netpoll_cleanup    = macvlan_dev_netpoll_cleanup,
1021 #endif
1022 };
1023
1024 void macvlan_common_setup(struct net_device *dev)
1025 {
1026         ether_setup(dev);
1027
1028         dev->priv_flags        &= ~IFF_TX_SKB_SHARING;
1029         netif_keep_dst(dev);
1030         dev->priv_flags        |= IFF_UNICAST_FLT;
1031         dev->netdev_ops         = &macvlan_netdev_ops;
1032         dev->destructor         = free_netdev;
1033         dev->header_ops         = &macvlan_hard_header_ops;
1034         dev->ethtool_ops        = &macvlan_ethtool_ops;
1035 }
1036 EXPORT_SYMBOL_GPL(macvlan_common_setup);
1037
1038 static void macvlan_setup(struct net_device *dev)
1039 {
1040         macvlan_common_setup(dev);
1041         dev->tx_queue_len       = 0;
1042 }
1043
1044 static int macvlan_port_create(struct net_device *dev)
1045 {
1046         struct macvlan_port *port;
1047         unsigned int i;
1048         int err;
1049
1050         if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1051                 return -EINVAL;
1052
1053         port = kzalloc(sizeof(*port), GFP_KERNEL);
1054         if (port == NULL)
1055                 return -ENOMEM;
1056
1057         port->passthru = false;
1058         port->dev = dev;
1059         INIT_LIST_HEAD(&port->vlans);
1060         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1061                 INIT_HLIST_HEAD(&port->vlan_hash[i]);
1062         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1063                 INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1064
1065         skb_queue_head_init(&port->bc_queue);
1066         INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1067
1068         err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1069         if (err)
1070                 kfree(port);
1071         else
1072                 dev->priv_flags |= IFF_MACVLAN_PORT;
1073         return err;
1074 }
1075
1076 static void macvlan_port_destroy(struct net_device *dev)
1077 {
1078         struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1079
1080         cancel_work_sync(&port->bc_work);
1081         dev->priv_flags &= ~IFF_MACVLAN_PORT;
1082         netdev_rx_handler_unregister(dev);
1083         kfree_rcu(port, rcu);
1084 }
1085
1086 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
1087 {
1088         if (tb[IFLA_ADDRESS]) {
1089                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1090                         return -EINVAL;
1091                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1092                         return -EADDRNOTAVAIL;
1093         }
1094
1095         if (data && data[IFLA_MACVLAN_FLAGS] &&
1096             nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
1097                 return -EINVAL;
1098
1099         if (data && data[IFLA_MACVLAN_MODE]) {
1100                 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1101                 case MACVLAN_MODE_PRIVATE:
1102                 case MACVLAN_MODE_VEPA:
1103                 case MACVLAN_MODE_BRIDGE:
1104                 case MACVLAN_MODE_PASSTHRU:
1105                 case MACVLAN_MODE_SOURCE:
1106                         break;
1107                 default:
1108                         return -EINVAL;
1109                 }
1110         }
1111
1112         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1113                 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1114                 case MACVLAN_MACADDR_ADD:
1115                 case MACVLAN_MACADDR_DEL:
1116                 case MACVLAN_MACADDR_FLUSH:
1117                 case MACVLAN_MACADDR_SET:
1118                         break;
1119                 default:
1120                         return -EINVAL;
1121                 }
1122         }
1123
1124         if (data && data[IFLA_MACVLAN_MACADDR]) {
1125                 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1126                         return -EINVAL;
1127
1128                 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1129                         return -EADDRNOTAVAIL;
1130         }
1131
1132         if (data && data[IFLA_MACVLAN_MACADDR_COUNT])
1133                 return -EINVAL;
1134
1135         return 0;
1136 }
1137
1138 /**
1139  * reconfigure list of remote source mac address
1140  * (only for macvlan devices in source mode)
1141  * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1142  * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1143  */
1144 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1145                                       struct nlattr *data[])
1146 {
1147         char *addr = NULL;
1148         int ret, rem, len;
1149         struct nlattr *nla, *head;
1150         struct macvlan_source_entry *entry;
1151
1152         if (data[IFLA_MACVLAN_MACADDR])
1153                 addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1154
1155         if (mode == MACVLAN_MACADDR_ADD) {
1156                 if (!addr)
1157                         return -EINVAL;
1158
1159                 return macvlan_hash_add_source(vlan, addr);
1160
1161         } else if (mode == MACVLAN_MACADDR_DEL) {
1162                 if (!addr)
1163                         return -EINVAL;
1164
1165                 entry = macvlan_hash_lookup_source(vlan, addr);
1166                 if (entry) {
1167                         macvlan_hash_del_source(entry);
1168                         vlan->macaddr_count--;
1169                 }
1170         } else if (mode == MACVLAN_MACADDR_FLUSH) {
1171                 macvlan_flush_sources(vlan->port, vlan);
1172         } else if (mode == MACVLAN_MACADDR_SET) {
1173                 macvlan_flush_sources(vlan->port, vlan);
1174
1175                 if (addr) {
1176                         ret = macvlan_hash_add_source(vlan, addr);
1177                         if (ret)
1178                                 return ret;
1179                 }
1180
1181                 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA])
1182                         return 0;
1183
1184                 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1185                 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1186
1187                 nla_for_each_attr(nla, head, len, rem) {
1188                         if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1189                             nla_len(nla) != ETH_ALEN)
1190                                 continue;
1191
1192                         addr = nla_data(nla);
1193                         ret = macvlan_hash_add_source(vlan, addr);
1194                         if (ret)
1195                                 return ret;
1196                 }
1197         } else {
1198                 return -EINVAL;
1199         }
1200
1201         return 0;
1202 }
1203
1204 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1205                            struct nlattr *tb[], struct nlattr *data[])
1206 {
1207         struct macvlan_dev *vlan = netdev_priv(dev);
1208         struct macvlan_port *port;
1209         struct net_device *lowerdev;
1210         int err;
1211         int macmode;
1212
1213         if (!tb[IFLA_LINK])
1214                 return -EINVAL;
1215
1216         lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1217         if (lowerdev == NULL)
1218                 return -ENODEV;
1219
1220         /* When creating macvlans or macvtaps on top of other macvlans - use
1221          * the real device as the lowerdev.
1222          */
1223         if (netif_is_macvlan(lowerdev))
1224                 lowerdev = macvlan_dev_real_dev(lowerdev);
1225
1226         if (!tb[IFLA_MTU])
1227                 dev->mtu = lowerdev->mtu;
1228         else if (dev->mtu > lowerdev->mtu)
1229                 return -EINVAL;
1230
1231         if (!tb[IFLA_ADDRESS])
1232                 eth_hw_addr_random(dev);
1233
1234         if (!macvlan_port_exists(lowerdev)) {
1235                 err = macvlan_port_create(lowerdev);
1236                 if (err < 0)
1237                         return err;
1238         }
1239         port = macvlan_port_get_rtnl(lowerdev);
1240
1241         /* Only 1 macvlan device can be created in passthru mode */
1242         if (port->passthru)
1243                 return -EINVAL;
1244
1245         vlan->lowerdev = lowerdev;
1246         vlan->dev      = dev;
1247         vlan->port     = port;
1248         vlan->set_features = MACVLAN_FEATURES;
1249         vlan->nest_level = dev_get_nest_level(lowerdev, netif_is_macvlan) + 1;
1250
1251         vlan->mode     = MACVLAN_MODE_VEPA;
1252         if (data && data[IFLA_MACVLAN_MODE])
1253                 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1254
1255         if (data && data[IFLA_MACVLAN_FLAGS])
1256                 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1257
1258         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1259                 if (port->count)
1260                         return -EINVAL;
1261                 port->passthru = true;
1262                 eth_hw_addr_inherit(dev, lowerdev);
1263         }
1264
1265         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1266                 if (vlan->mode != MACVLAN_MODE_SOURCE)
1267                         return -EINVAL;
1268                 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1269                 err = macvlan_changelink_sources(vlan, macmode, data);
1270                 if (err)
1271                         return err;
1272         }
1273
1274         port->count += 1;
1275         err = register_netdevice(dev);
1276         if (err < 0)
1277                 goto destroy_port;
1278
1279         dev->priv_flags |= IFF_MACVLAN;
1280         err = netdev_upper_dev_link(lowerdev, dev);
1281         if (err)
1282                 goto unregister_netdev;
1283
1284         list_add_tail_rcu(&vlan->list, &port->vlans);
1285         netif_stacked_transfer_operstate(lowerdev, dev);
1286
1287         return 0;
1288
1289 unregister_netdev:
1290         unregister_netdevice(dev);
1291 destroy_port:
1292         port->count -= 1;
1293         if (!port->count)
1294                 macvlan_port_destroy(lowerdev);
1295
1296         return err;
1297 }
1298 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1299
1300 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1301                            struct nlattr *tb[], struct nlattr *data[])
1302 {
1303         return macvlan_common_newlink(src_net, dev, tb, data);
1304 }
1305
1306 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1307 {
1308         struct macvlan_dev *vlan = netdev_priv(dev);
1309
1310         if (vlan->mode == MACVLAN_MODE_SOURCE)
1311                 macvlan_flush_sources(vlan->port, vlan);
1312         list_del_rcu(&vlan->list);
1313         unregister_netdevice_queue(dev, head);
1314         netdev_upper_dev_unlink(vlan->lowerdev, dev);
1315 }
1316 EXPORT_SYMBOL_GPL(macvlan_dellink);
1317
1318 static int macvlan_changelink(struct net_device *dev,
1319                 struct nlattr *tb[], struct nlattr *data[])
1320 {
1321         struct macvlan_dev *vlan = netdev_priv(dev);
1322         enum macvlan_mode mode;
1323         bool set_mode = false;
1324         enum macvlan_macaddr_mode macmode;
1325         int ret;
1326
1327         /* Validate mode, but don't set yet: setting flags may fail. */
1328         if (data && data[IFLA_MACVLAN_MODE]) {
1329                 set_mode = true;
1330                 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1331                 /* Passthrough mode can't be set or cleared dynamically */
1332                 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1333                     (vlan->mode == MACVLAN_MODE_PASSTHRU))
1334                         return -EINVAL;
1335                 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1336                     vlan->mode != mode)
1337                         macvlan_flush_sources(vlan->port, vlan);
1338         }
1339
1340         if (data && data[IFLA_MACVLAN_FLAGS]) {
1341                 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1342                 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1343                 if (vlan->port->passthru && promisc) {
1344                         int err;
1345
1346                         if (flags & MACVLAN_FLAG_NOPROMISC)
1347                                 err = dev_set_promiscuity(vlan->lowerdev, -1);
1348                         else
1349                                 err = dev_set_promiscuity(vlan->lowerdev, 1);
1350                         if (err < 0)
1351                                 return err;
1352                 }
1353                 vlan->flags = flags;
1354         }
1355         if (set_mode)
1356                 vlan->mode = mode;
1357         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1358                 if (vlan->mode != MACVLAN_MODE_SOURCE)
1359                         return -EINVAL;
1360                 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1361                 ret = macvlan_changelink_sources(vlan, macmode, data);
1362                 if (ret)
1363                         return ret;
1364         }
1365         return 0;
1366 }
1367
1368 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1369 {
1370         if (vlan->macaddr_count == 0)
1371                 return 0;
1372         return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1373                 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1374 }
1375
1376 static size_t macvlan_get_size(const struct net_device *dev)
1377 {
1378         struct macvlan_dev *vlan = netdev_priv(dev);
1379
1380         return (0
1381                 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1382                 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1383                 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1384                 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1385                 );
1386 }
1387
1388 static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1389                                      const struct macvlan_dev *vlan,
1390                                      const int i)
1391 {
1392         struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1393         struct macvlan_source_entry *entry;
1394
1395         hlist_for_each_entry_rcu(entry, h, hlist) {
1396                 if (entry->vlan != vlan)
1397                         continue;
1398                 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1399                         return 1;
1400         }
1401         return 0;
1402 }
1403
1404 static int macvlan_fill_info(struct sk_buff *skb,
1405                                 const struct net_device *dev)
1406 {
1407         struct macvlan_dev *vlan = netdev_priv(dev);
1408         int i;
1409         struct nlattr *nest;
1410
1411         if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1412                 goto nla_put_failure;
1413         if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1414                 goto nla_put_failure;
1415         if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1416                 goto nla_put_failure;
1417         if (vlan->macaddr_count > 0) {
1418                 nest = nla_nest_start(skb, IFLA_MACVLAN_MACADDR_DATA);
1419                 if (nest == NULL)
1420                         goto nla_put_failure;
1421
1422                 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1423                         if (macvlan_fill_info_macaddr(skb, vlan, i))
1424                                 goto nla_put_failure;
1425                 }
1426                 nla_nest_end(skb, nest);
1427         }
1428         return 0;
1429
1430 nla_put_failure:
1431         return -EMSGSIZE;
1432 }
1433
1434 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1435         [IFLA_MACVLAN_MODE]  = { .type = NLA_U32 },
1436         [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1437         [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1438         [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1439         [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1440         [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1441 };
1442
1443 int macvlan_link_register(struct rtnl_link_ops *ops)
1444 {
1445         /* common fields */
1446         ops->priv_size          = sizeof(struct macvlan_dev);
1447         ops->validate           = macvlan_validate;
1448         ops->maxtype            = IFLA_MACVLAN_MAX;
1449         ops->policy             = macvlan_policy;
1450         ops->changelink         = macvlan_changelink;
1451         ops->get_size           = macvlan_get_size;
1452         ops->fill_info          = macvlan_fill_info;
1453
1454         return rtnl_link_register(ops);
1455 };
1456 EXPORT_SYMBOL_GPL(macvlan_link_register);
1457
1458 static struct rtnl_link_ops macvlan_link_ops = {
1459         .kind           = "macvlan",
1460         .setup          = macvlan_setup,
1461         .newlink        = macvlan_newlink,
1462         .dellink        = macvlan_dellink,
1463 };
1464
1465 static int macvlan_device_event(struct notifier_block *unused,
1466                                 unsigned long event, void *ptr)
1467 {
1468         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1469         struct macvlan_dev *vlan, *next;
1470         struct macvlan_port *port;
1471         LIST_HEAD(list_kill);
1472
1473         if (!macvlan_port_exists(dev))
1474                 return NOTIFY_DONE;
1475
1476         port = macvlan_port_get_rtnl(dev);
1477
1478         switch (event) {
1479         case NETDEV_CHANGE:
1480                 list_for_each_entry(vlan, &port->vlans, list)
1481                         netif_stacked_transfer_operstate(vlan->lowerdev,
1482                                                          vlan->dev);
1483                 break;
1484         case NETDEV_FEAT_CHANGE:
1485                 list_for_each_entry(vlan, &port->vlans, list) {
1486                         vlan->dev->gso_max_size = dev->gso_max_size;
1487                         netdev_update_features(vlan->dev);
1488                 }
1489                 break;
1490         case NETDEV_CHANGEMTU:
1491                 list_for_each_entry(vlan, &port->vlans, list) {
1492                         if (vlan->dev->mtu <= dev->mtu)
1493                                 continue;
1494                         dev_set_mtu(vlan->dev, dev->mtu);
1495                 }
1496                 break;
1497         case NETDEV_CHANGEADDR:
1498                 if (!port->passthru)
1499                         return NOTIFY_DONE;
1500
1501                 vlan = list_first_entry_or_null(&port->vlans,
1502                                                 struct macvlan_dev,
1503                                                 list);
1504
1505                 if (macvlan_sync_address(vlan->dev, dev->dev_addr))
1506                         return NOTIFY_BAD;
1507
1508                 break;
1509         case NETDEV_UNREGISTER:
1510                 /* twiddle thumbs on netns device moves */
1511                 if (dev->reg_state != NETREG_UNREGISTERING)
1512                         break;
1513
1514                 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1515                         vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1516                 unregister_netdevice_many(&list_kill);
1517                 break;
1518         case NETDEV_PRE_TYPE_CHANGE:
1519                 /* Forbid underlaying device to change its type. */
1520                 return NOTIFY_BAD;
1521
1522         case NETDEV_NOTIFY_PEERS:
1523         case NETDEV_BONDING_FAILOVER:
1524         case NETDEV_RESEND_IGMP:
1525                 /* Propagate to all vlans */
1526                 list_for_each_entry(vlan, &port->vlans, list)
1527                         call_netdevice_notifiers(event, vlan->dev);
1528         }
1529         return NOTIFY_DONE;
1530 }
1531
1532 static struct notifier_block macvlan_notifier_block __read_mostly = {
1533         .notifier_call  = macvlan_device_event,
1534 };
1535
1536 static int __init macvlan_init_module(void)
1537 {
1538         int err;
1539
1540         register_netdevice_notifier(&macvlan_notifier_block);
1541
1542         err = macvlan_link_register(&macvlan_link_ops);
1543         if (err < 0)
1544                 goto err1;
1545         return 0;
1546 err1:
1547         unregister_netdevice_notifier(&macvlan_notifier_block);
1548         return err;
1549 }
1550
1551 static void __exit macvlan_cleanup_module(void)
1552 {
1553         rtnl_link_unregister(&macvlan_link_ops);
1554         unregister_netdevice_notifier(&macvlan_notifier_block);
1555 }
1556
1557 module_init(macvlan_init_module);
1558 module_exit(macvlan_cleanup_module);
1559
1560 MODULE_LICENSE("GPL");
1561 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1562 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1563 MODULE_ALIAS_RTNL_LINK("macvlan");