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, true);
 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, false);
 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;
 411         rx_handler_result_t handle_res;
 412
 413         port = macvlan_port_get_rcu(skb->dev);
 414         if (is_multicast_ether_addr(eth->h_dest)) {
 415                 skb = ip_check_defrag(skb, IP_DEFRAG_MACVLAN);
 416                 if (!skb)
 417                         return RX_HANDLER_CONSUMED;
 418                 eth = eth_hdr(skb);
 419                 macvlan_forward_source(skb, port, eth->h_source);
 420                 src = macvlan_hash_lookup(port, eth->h_source);
 421                 if (src && src->mode != MACVLAN_MODE_VEPA &&
 422                     src->mode != MACVLAN_MODE_BRIDGE) {
 423                         /* forward to original port. */
 424                         vlan = src;
 425                         ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
 426                               netif_rx(skb);
 427                         handle_res = RX_HANDLER_CONSUMED;
 428                         goto out;
 429                 }
 430
 431                 MACVLAN_SKB_CB(skb)->src = src;
 432                 macvlan_broadcast_enqueue(port, skb);
 433
 434                 return RX_HANDLER_PASS;
 435         }
 436
 437         macvlan_forward_source(skb, port, eth->h_source);
 438         if (port->passthru)
 439                 vlan = list_first_or_null_rcu(&port->vlans,
 440                                               struct macvlan_dev, list);
 441         else
 442                 vlan = macvlan_hash_lookup(port, eth->h_dest);
 443         if (vlan == NULL)
 444                 return RX_HANDLER_PASS;
 445
 446         dev = vlan->dev;
 447         if (unlikely(!(dev->flags & IFF_UP))) {
 448                 kfree_skb(skb);
 449                 return RX_HANDLER_CONSUMED;
 450         }
 451         len = skb->len + ETH_HLEN;
 452         skb = skb_share_check(skb, GFP_ATOMIC);
 453         if (!skb) {
 454                 ret = NET_RX_DROP;
 455                 handle_res = RX_HANDLER_CONSUMED;
 456                 goto out;
 457         }
 458
 459         skb->dev = dev;
 460         skb->pkt_type = PACKET_HOST;
 461
 462         ret = NET_RX_SUCCESS;
 463         handle_res = RX_HANDLER_ANOTHER;
 464 out:
 465         macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
 466         return handle_res;
 467 }
 468
 469 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
 470 {
 471         const struct macvlan_dev *vlan = netdev_priv(dev);
 472         const struct macvlan_port *port = vlan->port;
 473         const struct macvlan_dev *dest;
 474
 475         if (vlan->mode == MACVLAN_MODE_BRIDGE) {
 476                 const struct ethhdr *eth = (void *)skb->data;
 477
 478                 /* send to other bridge ports directly */
 479                 if (is_multicast_ether_addr(eth->h_dest)) {
 480                         macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
 481                         goto xmit_world;
 482                 }
 483
 484                 dest = macvlan_hash_lookup(port, eth->h_dest);
 485                 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
 486                         /* send to lowerdev first for its network taps */
 487                         dev_forward_skb(vlan->lowerdev, skb);
 488
 489                         return NET_XMIT_SUCCESS;
 490                 }
 491         }
 492
 493 xmit_world:
 494         skb->dev = vlan->lowerdev;
 495         return dev_queue_xmit(skb);
 496 }
 497
 498 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
 499 {
 500 #ifdef CONFIG_NET_POLL_CONTROLLER
 501         if (vlan->netpoll)
 502                 netpoll_send_skb(vlan->netpoll, skb);
 503 #else
 504         BUG();
 505 #endif
 506         return NETDEV_TX_OK;
 507 }
 508
 509 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
 510                                       struct net_device *dev)
 511 {
 512         unsigned int len = skb->len;
 513         int ret;
 514         struct macvlan_dev *vlan = netdev_priv(dev);
 515
 516         if (unlikely(netpoll_tx_running(dev)))
 517                 return macvlan_netpoll_send_skb(vlan, skb);
 518
 519         if (vlan->fwd_priv) {
 520                 skb->dev = vlan->lowerdev;
 521                 ret = dev_queue_xmit_accel(skb, vlan->fwd_priv);
 522         } else {
 523                 ret = macvlan_queue_xmit(skb, dev);
 524         }
 525
 526         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 527                 struct vlan_pcpu_stats *pcpu_stats;
 528
 529                 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
 530                 u64_stats_update_begin(&pcpu_stats->syncp);
 531                 pcpu_stats->tx_packets++;
 532                 pcpu_stats->tx_bytes += len;
 533                 u64_stats_update_end(&pcpu_stats->syncp);
 534         } else {
 535                 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
 536         }
 537         return ret;
 538 }
 539
 540 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
 541                                unsigned short type, const void *daddr,
 542                                const void *saddr, unsigned len)
 543 {
 544         const struct macvlan_dev *vlan = netdev_priv(dev);
 545         struct net_device *lowerdev = vlan->lowerdev;
 546
 547         return dev_hard_header(skb, lowerdev, type, daddr,
 548                                saddr ? : dev->dev_addr, len);
 549 }
 550
 551 static const struct header_ops macvlan_hard_header_ops = {
 552         .create         = macvlan_hard_header,
 553         .rebuild        = eth_rebuild_header,
 554         .parse          = eth_header_parse,
 555         .cache          = eth_header_cache,
 556         .cache_update   = eth_header_cache_update,
 557 };
 558
 559 static struct rtnl_link_ops macvlan_link_ops;
 560
 561 static int macvlan_open(struct net_device *dev)
 562 {
 563         struct macvlan_dev *vlan = netdev_priv(dev);
 564         struct net_device *lowerdev = vlan->lowerdev;
 565         int err;
 566
 567         if (vlan->port->passthru) {
 568                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
 569                         err = dev_set_promiscuity(lowerdev, 1);
 570                         if (err < 0)
 571                                 goto out;
 572                 }
 573                 goto hash_add;
 574         }
 575
 576         if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD &&
 577             dev->rtnl_link_ops == &macvlan_link_ops) {
 578                 vlan->fwd_priv =
 579                       lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
 580
 581                 /* If we get a NULL pointer back, or if we get an error
 582                  * then we should just fall through to the non accelerated path
 583                  */
 584                 if (IS_ERR_OR_NULL(vlan->fwd_priv)) {
 585                         vlan->fwd_priv = NULL;
 586                 } else
 587                         return 0;
 588         }
 589
 590         err = -EBUSY;
 591         if (macvlan_addr_busy(vlan->port, dev->dev_addr))
 592                 goto out;
 593
 594         err = dev_uc_add(lowerdev, dev->dev_addr);
 595         if (err < 0)
 596                 goto out;
 597         if (dev->flags & IFF_ALLMULTI) {
 598                 err = dev_set_allmulti(lowerdev, 1);
 599                 if (err < 0)
 600                         goto del_unicast;
 601         }
 602
 603 hash_add:
 604         macvlan_hash_add(vlan);
 605         return 0;
 606
 607 del_unicast:
 608         dev_uc_del(lowerdev, dev->dev_addr);
 609 out:
 610         if (vlan->fwd_priv) {
 611                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
 612                                                            vlan->fwd_priv);
 613                 vlan->fwd_priv = NULL;
 614         }
 615         return err;
 616 }
 617
 618 static int macvlan_stop(struct net_device *dev)
 619 {
 620         struct macvlan_dev *vlan = netdev_priv(dev);
 621         struct net_device *lowerdev = vlan->lowerdev;
 622
 623         if (vlan->fwd_priv) {
 624                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
 625                                                            vlan->fwd_priv);
 626                 vlan->fwd_priv = NULL;
 627                 return 0;
 628         }
 629
 630         dev_uc_unsync(lowerdev, dev);
 631         dev_mc_unsync(lowerdev, dev);
 632
 633         if (vlan->port->passthru) {
 634                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
 635                         dev_set_promiscuity(lowerdev, -1);
 636                 goto hash_del;
 637         }
 638
 639         if (dev->flags & IFF_ALLMULTI)
 640                 dev_set_allmulti(lowerdev, -1);
 641
 642         dev_uc_del(lowerdev, dev->dev_addr);
 643
 644 hash_del:
 645         macvlan_hash_del(vlan, !dev->dismantle);
 646         return 0;
 647 }
 648
 649 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
 650 {
 651         struct macvlan_dev *vlan = netdev_priv(dev);
 652         struct net_device *lowerdev = vlan->lowerdev;
 653         int err;
 654
 655         if (!(dev->flags & IFF_UP)) {
 656                 /* Just copy in the new address */
 657                 ether_addr_copy(dev->dev_addr, addr);
 658         } else {
 659                 /* Rehash and update the device filters */
 660                 if (macvlan_addr_busy(vlan->port, addr))
 661                         return -EBUSY;
 662
 663                 if (!vlan->port->passthru) {
 664                         err = dev_uc_add(lowerdev, addr);
 665                         if (err)
 666                                 return err;
 667
 668                         dev_uc_del(lowerdev, dev->dev_addr);
 669                 }
 670
 671                 macvlan_hash_change_addr(vlan, addr);
 672         }
 673         return 0;
 674 }
 675
 676 static int macvlan_set_mac_address(struct net_device *dev, void *p)
 677 {
 678         struct macvlan_dev *vlan = netdev_priv(dev);
 679         struct sockaddr *addr = p;
 680
 681         if (!is_valid_ether_addr(addr->sa_data))
 682                 return -EADDRNOTAVAIL;
 683
 684         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
 685                 dev_set_mac_address(vlan->lowerdev, addr);
 686                 return 0;
 687         }
 688
 689         return macvlan_sync_address(dev, addr->sa_data);
 690 }
 691
 692 static void macvlan_change_rx_flags(struct net_device *dev, int change)
 693 {
 694         struct macvlan_dev *vlan = netdev_priv(dev);
 695         struct net_device *lowerdev = vlan->lowerdev;
 696
 697         if (dev->flags & IFF_UP) {
 698                 if (change & IFF_ALLMULTI)
 699                         dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 700         }
 701 }
 702
 703 static void macvlan_set_mac_lists(struct net_device *dev)
 704 {
 705         struct macvlan_dev *vlan = netdev_priv(dev);
 706
 707         if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
 708                 bitmap_fill(vlan->mc_filter, MACVLAN_MC_FILTER_SZ);
 709         } else {
 710                 struct netdev_hw_addr *ha;
 711                 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
 712
 713                 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
 714                 netdev_for_each_mc_addr(ha, dev) {
 715                         __set_bit(mc_hash(vlan, ha->addr), filter);
 716                 }
 717
 718                 __set_bit(mc_hash(vlan, dev->broadcast), filter);
 719
 720                 bitmap_copy(vlan->mc_filter, filter, MACVLAN_MC_FILTER_SZ);
 721         }
 722         dev_uc_sync(vlan->lowerdev, dev);
 723         dev_mc_sync(vlan->lowerdev, dev);
 724 }
 725
 726 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
 727 {
 728         struct macvlan_dev *vlan = netdev_priv(dev);
 729
 730         if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
 731                 return -EINVAL;
 732         dev->mtu = new_mtu;
 733         return 0;
 734 }
 735
 736 /*
 737  * macvlan network devices have devices nesting below it and are a special
 738  * "super class" of normal network devices; split their locks off into a
 739  * separate class since they always nest.
 740  */
 741 static struct lock_class_key macvlan_netdev_xmit_lock_key;
 742 static struct lock_class_key macvlan_netdev_addr_lock_key;
 743
 744 #define ALWAYS_ON_FEATURES \
 745         (NETIF_F_SG | NETIF_F_GEN_CSUM | NETIF_F_GSO_SOFTWARE | NETIF_F_LLTX | \
 746          NETIF_F_GSO_ROBUST)
 747
 748 #define MACVLAN_FEATURES \
 749         (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
 750          NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_LRO | \
 751          NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
 752          NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
 753
 754 #define MACVLAN_STATE_MASK \
 755         ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
 756
 757 static int macvlan_get_nest_level(struct net_device *dev)
 758 {
 759         return ((struct macvlan_dev *)netdev_priv(dev))->nest_level;
 760 }
 761
 762 static void macvlan_set_lockdep_class_one(struct net_device *dev,
 763                                           struct netdev_queue *txq,
 764                                           void *_unused)
 765 {
 766         lockdep_set_class(&txq->_xmit_lock,
 767                           &macvlan_netdev_xmit_lock_key);
 768 }
 769
 770 static void macvlan_set_lockdep_class(struct net_device *dev)
 771 {
 772         lockdep_set_class_and_subclass(&dev->addr_list_lock,
 773                                        &macvlan_netdev_addr_lock_key,
 774                                        macvlan_get_nest_level(dev));
 775         netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
 776 }
 777
 778 static int macvlan_init(struct net_device *dev)
 779 {
 780         struct macvlan_dev *vlan = netdev_priv(dev);
 781         const struct net_device *lowerdev = vlan->lowerdev;
 782
 783         dev->state              = (dev->state & ~MACVLAN_STATE_MASK) |
 784                                   (lowerdev->state & MACVLAN_STATE_MASK);
 785         dev->features           = lowerdev->features & MACVLAN_FEATURES;
 786         dev->features           |= ALWAYS_ON_FEATURES;
 787         dev->hw_features        |= NETIF_F_LRO;
 788         dev->vlan_features      = lowerdev->vlan_features & MACVLAN_FEATURES;
 789         dev->gso_max_size       = lowerdev->gso_max_size;
 790         dev->iflink             = lowerdev->ifindex;
 791         dev->hard_header_len    = lowerdev->hard_header_len;
 792
 793         macvlan_set_lockdep_class(dev);
 794
 795         vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
 796         if (!vlan->pcpu_stats)
 797                 return -ENOMEM;
 798
 799         return 0;
 800 }
 801
 802 static void macvlan_uninit(struct net_device *dev)
 803 {
 804         struct macvlan_dev *vlan = netdev_priv(dev);
 805         struct macvlan_port *port = vlan->port;
 806
 807         free_percpu(vlan->pcpu_stats);
 808
 809         macvlan_flush_sources(port, vlan);
 810         port->count -= 1;
 811         if (!port->count)
 812                 macvlan_port_destroy(port->dev);
 813 }
 814
 815 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
 816                                                          struct rtnl_link_stats64 *stats)
 817 {
 818         struct macvlan_dev *vlan = netdev_priv(dev);
 819
 820         if (vlan->pcpu_stats) {
 821                 struct vlan_pcpu_stats *p;
 822                 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
 823                 u32 rx_errors = 0, tx_dropped = 0;
 824                 unsigned int start;
 825                 int i;
 826
 827                 for_each_possible_cpu(i) {
 828                         p = per_cpu_ptr(vlan->pcpu_stats, i);
 829                         do {
 830                                 start = u64_stats_fetch_begin_irq(&p->syncp);
 831                                 rx_packets      = p->rx_packets;
 832                                 rx_bytes        = p->rx_bytes;
 833                                 rx_multicast    = p->rx_multicast;
 834                                 tx_packets      = p->tx_packets;
 835                                 tx_bytes        = p->tx_bytes;
 836                         } while (u64_stats_fetch_retry_irq(&p->syncp, start));
 837
 838                         stats->rx_packets       += rx_packets;
 839                         stats->rx_bytes         += rx_bytes;
 840                         stats->multicast        += rx_multicast;
 841                         stats->tx_packets       += tx_packets;
 842                         stats->tx_bytes         += tx_bytes;
 843                         /* rx_errors & tx_dropped are u32, updated
 844                          * without syncp protection.
 845                          */
 846                         rx_errors       += p->rx_errors;
 847                         tx_dropped      += p->tx_dropped;
 848                 }
 849                 stats->rx_errors        = rx_errors;
 850                 stats->rx_dropped       = rx_errors;
 851                 stats->tx_dropped       = tx_dropped;
 852         }
 853         return stats;
 854 }
 855
 856 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
 857                                    __be16 proto, u16 vid)
 858 {
 859         struct macvlan_dev *vlan = netdev_priv(dev);
 860         struct net_device *lowerdev = vlan->lowerdev;
 861
 862         return vlan_vid_add(lowerdev, proto, vid);
 863 }
 864
 865 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
 866                                     __be16 proto, u16 vid)
 867 {
 868         struct macvlan_dev *vlan = netdev_priv(dev);
 869         struct net_device *lowerdev = vlan->lowerdev;
 870
 871         vlan_vid_del(lowerdev, proto, vid);
 872         return 0;
 873 }
 874
 875 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 876                            struct net_device *dev,
 877                            const unsigned char *addr, u16 vid,
 878                            u16 flags)
 879 {
 880         struct macvlan_dev *vlan = netdev_priv(dev);
 881         int err = -EINVAL;
 882
 883         /* Support unicast filter only on passthru devices.
 884          * Multicast filter should be allowed on all devices.
 885          */
 886         if (!vlan->port->passthru && is_unicast_ether_addr(addr))
 887                 return -EOPNOTSUPP;
 888
 889         if (flags & NLM_F_REPLACE)
 890                 return -EOPNOTSUPP;
 891
 892         if (is_unicast_ether_addr(addr))
 893                 err = dev_uc_add_excl(dev, addr);
 894         else if (is_multicast_ether_addr(addr))
 895                 err = dev_mc_add_excl(dev, addr);
 896
 897         return err;
 898 }
 899
 900 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
 901                            struct net_device *dev,
 902                            const unsigned char *addr, u16 vid)
 903 {
 904         struct macvlan_dev *vlan = netdev_priv(dev);
 905         int err = -EINVAL;
 906
 907         /* Support unicast filter only on passthru devices.
 908          * Multicast filter should be allowed on all devices.
 909          */
 910         if (!vlan->port->passthru && is_unicast_ether_addr(addr))
 911                 return -EOPNOTSUPP;
 912
 913         if (is_unicast_ether_addr(addr))
 914                 err = dev_uc_del(dev, addr);
 915         else if (is_multicast_ether_addr(addr))
 916                 err = dev_mc_del(dev, addr);
 917
 918         return err;
 919 }
 920
 921 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
 922                                         struct ethtool_drvinfo *drvinfo)
 923 {
 924         strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
 925         strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
 926 }
 927
 928 static int macvlan_ethtool_get_settings(struct net_device *dev,
 929                                         struct ethtool_cmd *cmd)
 930 {
 931         const struct macvlan_dev *vlan = netdev_priv(dev);
 932
 933         return __ethtool_get_settings(vlan->lowerdev, cmd);
 934 }
 935
 936 static netdev_features_t macvlan_fix_features(struct net_device *dev,
 937                                               netdev_features_t features)
 938 {
 939         struct macvlan_dev *vlan = netdev_priv(dev);
 940         netdev_features_t lowerdev_features = vlan->lowerdev->features;
 941         netdev_features_t mask;
 942
 943         features |= NETIF_F_ALL_FOR_ALL;
 944         features &= (vlan->set_features | ~MACVLAN_FEATURES);
 945         mask = features;
 946
 947         lowerdev_features &= (features | ~NETIF_F_LRO);
 948         features = netdev_increment_features(lowerdev_features, features, mask);
 949         features |= ALWAYS_ON_FEATURES;
 950         features &= ~NETIF_F_NETNS_LOCAL;
 951
 952         return features;
 953 }
 954
 955 #ifdef CONFIG_NET_POLL_CONTROLLER
 956 static void macvlan_dev_poll_controller(struct net_device *dev)
 957 {
 958         return;
 959 }
 960
 961 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
 962 {
 963         struct macvlan_dev *vlan = netdev_priv(dev);
 964         struct net_device *real_dev = vlan->lowerdev;
 965         struct netpoll *netpoll;
 966         int err = 0;
 967
 968         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 969         err = -ENOMEM;
 970         if (!netpoll)
 971                 goto out;
 972
 973         err = __netpoll_setup(netpoll, real_dev);
 974         if (err) {
 975                 kfree(netpoll);
 976                 goto out;
 977         }
 978
 979         vlan->netpoll = netpoll;
 980
 981 out:
 982         return err;
 983 }
 984
 985 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
 986 {
 987         struct macvlan_dev *vlan = netdev_priv(dev);
 988         struct netpoll *netpoll = vlan->netpoll;
 989
 990         if (!netpoll)
 991                 return;
 992
 993         vlan->netpoll = NULL;
 994
 995         __netpoll_free_async(netpoll);
 996 }
 997 #endif  /* CONFIG_NET_POLL_CONTROLLER */
 998
 999 static const struct ethtool_ops macvlan_ethtool_ops = {
1000         .get_link               = ethtool_op_get_link,
1001         .get_settings           = macvlan_ethtool_get_settings,
1002         .get_drvinfo            = macvlan_ethtool_get_drvinfo,
1003 };
1004
1005 static const struct net_device_ops macvlan_netdev_ops = {
1006         .ndo_init               = macvlan_init,
1007         .ndo_uninit             = macvlan_uninit,
1008         .ndo_open               = macvlan_open,
1009         .ndo_stop               = macvlan_stop,
1010         .ndo_start_xmit         = macvlan_start_xmit,
1011         .ndo_change_mtu         = macvlan_change_mtu,
1012         .ndo_fix_features       = macvlan_fix_features,
1013         .ndo_change_rx_flags    = macvlan_change_rx_flags,
1014         .ndo_set_mac_address    = macvlan_set_mac_address,
1015         .ndo_set_rx_mode        = macvlan_set_mac_lists,
1016         .ndo_get_stats64        = macvlan_dev_get_stats64,
1017         .ndo_validate_addr      = eth_validate_addr,
1018         .ndo_vlan_rx_add_vid    = macvlan_vlan_rx_add_vid,
1019         .ndo_vlan_rx_kill_vid   = macvlan_vlan_rx_kill_vid,
1020         .ndo_fdb_add            = macvlan_fdb_add,
1021         .ndo_fdb_del            = macvlan_fdb_del,
1022         .ndo_fdb_dump           = ndo_dflt_fdb_dump,
1023         .ndo_get_lock_subclass  = macvlan_get_nest_level,
1024 #ifdef CONFIG_NET_POLL_CONTROLLER
1025         .ndo_poll_controller    = macvlan_dev_poll_controller,
1026         .ndo_netpoll_setup      = macvlan_dev_netpoll_setup,
1027         .ndo_netpoll_cleanup    = macvlan_dev_netpoll_cleanup,
1028 #endif
1029 };
1030
1031 void macvlan_common_setup(struct net_device *dev)
1032 {
1033         ether_setup(dev);
1034
1035         dev->priv_flags        &= ~IFF_TX_SKB_SHARING;
1036         netif_keep_dst(dev);
1037         dev->priv_flags        |= IFF_UNICAST_FLT;
1038         dev->netdev_ops         = &macvlan_netdev_ops;
1039         dev->destructor         = free_netdev;
1040         dev->header_ops         = &macvlan_hard_header_ops;
1041         dev->ethtool_ops        = &macvlan_ethtool_ops;
1042 }
1043 EXPORT_SYMBOL_GPL(macvlan_common_setup);
1044
1045 static void macvlan_setup(struct net_device *dev)
1046 {
1047         macvlan_common_setup(dev);
1048         dev->tx_queue_len       = 0;
1049 }
1050
1051 static int macvlan_port_create(struct net_device *dev)
1052 {
1053         struct macvlan_port *port;
1054         unsigned int i;
1055         int err;
1056
1057         if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1058                 return -EINVAL;
1059
1060         if (netif_is_ipvlan_port(dev))
1061                 return -EBUSY;
1062
1063         port = kzalloc(sizeof(*port), GFP_KERNEL);
1064         if (port == NULL)
1065                 return -ENOMEM;
1066
1067         port->passthru = false;
1068         port->dev = dev;
1069         INIT_LIST_HEAD(&port->vlans);
1070         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1071                 INIT_HLIST_HEAD(&port->vlan_hash[i]);
1072         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1073                 INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1074
1075         skb_queue_head_init(&port->bc_queue);
1076         INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1077
1078         err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1079         if (err)
1080                 kfree(port);
1081         else
1082                 dev->priv_flags |= IFF_MACVLAN_PORT;
1083         return err;
1084 }
1085
1086 static void macvlan_port_destroy(struct net_device *dev)
1087 {
1088         struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1089
1090         dev->priv_flags &= ~IFF_MACVLAN_PORT;
1091         netdev_rx_handler_unregister(dev);
1092
1093         /* After this point, no packet can schedule bc_work anymore,
1094          * but we need to cancel it and purge left skbs if any.
1095          */
1096         cancel_work_sync(&port->bc_work);
1097         __skb_queue_purge(&port->bc_queue);
1098
1099         kfree_rcu(port, rcu);
1100 }
1101
1102 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
1103 {
1104         if (tb[IFLA_ADDRESS]) {
1105                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1106                         return -EINVAL;
1107                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1108                         return -EADDRNOTAVAIL;
1109         }
1110
1111         if (data && data[IFLA_MACVLAN_FLAGS] &&
1112             nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
1113                 return -EINVAL;
1114
1115         if (data && data[IFLA_MACVLAN_MODE]) {
1116                 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1117                 case MACVLAN_MODE_PRIVATE:
1118                 case MACVLAN_MODE_VEPA:
1119                 case MACVLAN_MODE_BRIDGE:
1120                 case MACVLAN_MODE_PASSTHRU:
1121                 case MACVLAN_MODE_SOURCE:
1122                         break;
1123                 default:
1124                         return -EINVAL;
1125                 }
1126         }
1127
1128         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1129                 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1130                 case MACVLAN_MACADDR_ADD:
1131                 case MACVLAN_MACADDR_DEL:
1132                 case MACVLAN_MACADDR_FLUSH:
1133                 case MACVLAN_MACADDR_SET:
1134                         break;
1135                 default:
1136                         return -EINVAL;
1137                 }
1138         }
1139
1140         if (data && data[IFLA_MACVLAN_MACADDR]) {
1141                 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1142                         return -EINVAL;
1143
1144                 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1145                         return -EADDRNOTAVAIL;
1146         }
1147
1148         if (data && data[IFLA_MACVLAN_MACADDR_COUNT])
1149                 return -EINVAL;
1150
1151         return 0;
1152 }
1153
1154 /**
1155  * reconfigure list of remote source mac address
1156  * (only for macvlan devices in source mode)
1157  * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1158  * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1159  */
1160 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1161                                       struct nlattr *data[])
1162 {
1163         char *addr = NULL;
1164         int ret, rem, len;
1165         struct nlattr *nla, *head;
1166         struct macvlan_source_entry *entry;
1167
1168         if (data[IFLA_MACVLAN_MACADDR])
1169                 addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1170
1171         if (mode == MACVLAN_MACADDR_ADD) {
1172                 if (!addr)
1173                         return -EINVAL;
1174
1175                 return macvlan_hash_add_source(vlan, addr);
1176
1177         } else if (mode == MACVLAN_MACADDR_DEL) {
1178                 if (!addr)
1179                         return -EINVAL;
1180
1181                 entry = macvlan_hash_lookup_source(vlan, addr);
1182                 if (entry) {
1183                         macvlan_hash_del_source(entry);
1184                         vlan->macaddr_count--;
1185                 }
1186         } else if (mode == MACVLAN_MACADDR_FLUSH) {
1187                 macvlan_flush_sources(vlan->port, vlan);
1188         } else if (mode == MACVLAN_MACADDR_SET) {
1189                 macvlan_flush_sources(vlan->port, vlan);
1190
1191                 if (addr) {
1192                         ret = macvlan_hash_add_source(vlan, addr);
1193                         if (ret)
1194                                 return ret;
1195                 }
1196
1197                 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA])
1198                         return 0;
1199
1200                 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1201                 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1202
1203                 nla_for_each_attr(nla, head, len, rem) {
1204                         if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1205                             nla_len(nla) != ETH_ALEN)
1206                                 continue;
1207
1208                         addr = nla_data(nla);
1209                         ret = macvlan_hash_add_source(vlan, addr);
1210                         if (ret)
1211                                 return ret;
1212                 }
1213         } else {
1214                 return -EINVAL;
1215         }
1216
1217         return 0;
1218 }
1219
1220 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1221                            struct nlattr *tb[], struct nlattr *data[])
1222 {
1223         struct macvlan_dev *vlan = netdev_priv(dev);
1224         struct macvlan_port *port;
1225         struct net_device *lowerdev;
1226         int err;
1227         int macmode;
1228
1229         if (!tb[IFLA_LINK])
1230                 return -EINVAL;
1231
1232         lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1233         if (lowerdev == NULL)
1234                 return -ENODEV;
1235
1236         /* When creating macvlans or macvtaps on top of other macvlans - use
1237          * the real device as the lowerdev.
1238          */
1239         if (netif_is_macvlan(lowerdev))
1240                 lowerdev = macvlan_dev_real_dev(lowerdev);
1241
1242         if (!tb[IFLA_MTU])
1243                 dev->mtu = lowerdev->mtu;
1244         else if (dev->mtu > lowerdev->mtu)
1245                 return -EINVAL;
1246
1247         if (!tb[IFLA_ADDRESS])
1248                 eth_hw_addr_random(dev);
1249
1250         if (!macvlan_port_exists(lowerdev)) {
1251                 err = macvlan_port_create(lowerdev);
1252                 if (err < 0)
1253                         return err;
1254         }
1255         port = macvlan_port_get_rtnl(lowerdev);
1256
1257         /* Only 1 macvlan device can be created in passthru mode */
1258         if (port->passthru)
1259                 return -EINVAL;
1260
1261         vlan->lowerdev = lowerdev;
1262         vlan->dev      = dev;
1263         vlan->port     = port;
1264         vlan->set_features = MACVLAN_FEATURES;
1265         vlan->nest_level = dev_get_nest_level(lowerdev, netif_is_macvlan) + 1;
1266
1267         vlan->mode     = MACVLAN_MODE_VEPA;
1268         if (data && data[IFLA_MACVLAN_MODE])
1269                 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1270
1271         if (data && data[IFLA_MACVLAN_FLAGS])
1272                 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1273
1274         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1275                 if (port->count)
1276                         return -EINVAL;
1277                 port->passthru = true;
1278                 eth_hw_addr_inherit(dev, lowerdev);
1279         }
1280
1281         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1282                 if (vlan->mode != MACVLAN_MODE_SOURCE)
1283                         return -EINVAL;
1284                 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1285                 err = macvlan_changelink_sources(vlan, macmode, data);
1286                 if (err)
1287                         return err;
1288         }
1289
1290         port->count += 1;
1291         err = register_netdevice(dev);
1292         if (err < 0)
1293                 goto destroy_port;
1294
1295         dev->priv_flags |= IFF_MACVLAN;
1296         err = netdev_upper_dev_link(lowerdev, dev);
1297         if (err)
1298                 goto unregister_netdev;
1299
1300         list_add_tail_rcu(&vlan->list, &port->vlans);
1301         netif_stacked_transfer_operstate(lowerdev, dev);
1302
1303         return 0;
1304
1305 unregister_netdev:
1306         unregister_netdevice(dev);
1307 destroy_port:
1308         port->count -= 1;
1309         if (!port->count)
1310                 macvlan_port_destroy(lowerdev);
1311
1312         return err;
1313 }
1314 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1315
1316 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1317                            struct nlattr *tb[], struct nlattr *data[])
1318 {
1319         return macvlan_common_newlink(src_net, dev, tb, data);
1320 }
1321
1322 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1323 {
1324         struct macvlan_dev *vlan = netdev_priv(dev);
1325
1326         if (vlan->mode == MACVLAN_MODE_SOURCE)
1327                 macvlan_flush_sources(vlan->port, vlan);
1328         list_del_rcu(&vlan->list);
1329         unregister_netdevice_queue(dev, head);
1330         netdev_upper_dev_unlink(vlan->lowerdev, dev);
1331 }
1332 EXPORT_SYMBOL_GPL(macvlan_dellink);
1333
1334 static int macvlan_changelink(struct net_device *dev,
1335                 struct nlattr *tb[], struct nlattr *data[])
1336 {
1337         struct macvlan_dev *vlan = netdev_priv(dev);
1338         enum macvlan_mode mode;
1339         bool set_mode = false;
1340         enum macvlan_macaddr_mode macmode;
1341         int ret;
1342
1343         /* Validate mode, but don't set yet: setting flags may fail. */
1344         if (data && data[IFLA_MACVLAN_MODE]) {
1345                 set_mode = true;
1346                 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1347                 /* Passthrough mode can't be set or cleared dynamically */
1348                 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1349                     (vlan->mode == MACVLAN_MODE_PASSTHRU))
1350                         return -EINVAL;
1351                 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1352                     vlan->mode != mode)
1353                         macvlan_flush_sources(vlan->port, vlan);
1354         }
1355
1356         if (data && data[IFLA_MACVLAN_FLAGS]) {
1357                 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1358                 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1359                 if (vlan->port->passthru && promisc) {
1360                         int err;
1361
1362                         if (flags & MACVLAN_FLAG_NOPROMISC)
1363                                 err = dev_set_promiscuity(vlan->lowerdev, -1);
1364                         else
1365                                 err = dev_set_promiscuity(vlan->lowerdev, 1);
1366                         if (err < 0)
1367                                 return err;
1368                 }
1369                 vlan->flags = flags;
1370         }
1371         if (set_mode)
1372                 vlan->mode = mode;
1373         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1374                 if (vlan->mode != MACVLAN_MODE_SOURCE)
1375                         return -EINVAL;
1376                 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1377                 ret = macvlan_changelink_sources(vlan, macmode, data);
1378                 if (ret)
1379                         return ret;
1380         }
1381         return 0;
1382 }
1383
1384 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1385 {
1386         if (vlan->macaddr_count == 0)
1387                 return 0;
1388         return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1389                 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1390 }
1391
1392 static size_t macvlan_get_size(const struct net_device *dev)
1393 {
1394         struct macvlan_dev *vlan = netdev_priv(dev);
1395
1396         return (0
1397                 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1398                 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1399                 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1400                 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1401                 );
1402 }
1403
1404 static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1405                                      const struct macvlan_dev *vlan,
1406                                      const int i)
1407 {
1408         struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1409         struct macvlan_source_entry *entry;
1410
1411         hlist_for_each_entry_rcu(entry, h, hlist) {
1412                 if (entry->vlan != vlan)
1413                         continue;
1414                 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1415                         return 1;
1416         }
1417         return 0;
1418 }
1419
1420 static int macvlan_fill_info(struct sk_buff *skb,
1421                                 const struct net_device *dev)
1422 {
1423         struct macvlan_dev *vlan = netdev_priv(dev);
1424         int i;
1425         struct nlattr *nest;
1426
1427         if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1428                 goto nla_put_failure;
1429         if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1430                 goto nla_put_failure;
1431         if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1432                 goto nla_put_failure;
1433         if (vlan->macaddr_count > 0) {
1434                 nest = nla_nest_start(skb, IFLA_MACVLAN_MACADDR_DATA);
1435                 if (nest == NULL)
1436                         goto nla_put_failure;
1437
1438                 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1439                         if (macvlan_fill_info_macaddr(skb, vlan, i))
1440                                 goto nla_put_failure;
1441                 }
1442                 nla_nest_end(skb, nest);
1443         }
1444         return 0;
1445
1446 nla_put_failure:
1447         return -EMSGSIZE;
1448 }
1449
1450 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1451         [IFLA_MACVLAN_MODE]  = { .type = NLA_U32 },
1452         [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1453         [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1454         [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1455         [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1456         [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1457 };
1458
1459 int macvlan_link_register(struct rtnl_link_ops *ops)
1460 {
1461         /* common fields */
1462         ops->priv_size          = sizeof(struct macvlan_dev);
1463         ops->validate           = macvlan_validate;
1464         ops->maxtype            = IFLA_MACVLAN_MAX;
1465         ops->policy             = macvlan_policy;
1466         ops->changelink         = macvlan_changelink;
1467         ops->get_size           = macvlan_get_size;
1468         ops->fill_info          = macvlan_fill_info;
1469
1470         return rtnl_link_register(ops);
1471 };
1472 EXPORT_SYMBOL_GPL(macvlan_link_register);
1473
1474 static struct rtnl_link_ops macvlan_link_ops = {
1475         .kind           = "macvlan",
1476         .setup          = macvlan_setup,
1477         .newlink        = macvlan_newlink,
1478         .dellink        = macvlan_dellink,
1479 };
1480
1481 static int macvlan_device_event(struct notifier_block *unused,
1482                                 unsigned long event, void *ptr)
1483 {
1484         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1485         struct macvlan_dev *vlan, *next;
1486         struct macvlan_port *port;
1487         LIST_HEAD(list_kill);
1488
1489         if (!macvlan_port_exists(dev))
1490                 return NOTIFY_DONE;
1491
1492         port = macvlan_port_get_rtnl(dev);
1493
1494         switch (event) {
1495         case NETDEV_CHANGE:
1496                 list_for_each_entry(vlan, &port->vlans, list)
1497                         netif_stacked_transfer_operstate(vlan->lowerdev,
1498                                                          vlan->dev);
1499                 break;
1500         case NETDEV_FEAT_CHANGE:
1501                 list_for_each_entry(vlan, &port->vlans, list) {
1502                         vlan->dev->gso_max_size = dev->gso_max_size;
1503                         netdev_update_features(vlan->dev);
1504                 }
1505                 break;
1506         case NETDEV_CHANGEMTU:
1507                 list_for_each_entry(vlan, &port->vlans, list) {
1508                         if (vlan->dev->mtu <= dev->mtu)
1509                                 continue;
1510                         dev_set_mtu(vlan->dev, dev->mtu);
1511                 }
1512                 break;
1513         case NETDEV_CHANGEADDR:
1514                 if (!port->passthru)
1515                         return NOTIFY_DONE;
1516
1517                 vlan = list_first_entry_or_null(&port->vlans,
1518                                                 struct macvlan_dev,
1519                                                 list);
1520
1521                 if (macvlan_sync_address(vlan->dev, dev->dev_addr))
1522                         return NOTIFY_BAD;
1523
1524                 break;
1525         case NETDEV_UNREGISTER:
1526                 /* twiddle thumbs on netns device moves */
1527                 if (dev->reg_state != NETREG_UNREGISTERING)
1528                         break;
1529
1530                 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1531                         vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1532                 unregister_netdevice_many(&list_kill);
1533                 break;
1534         case NETDEV_PRE_TYPE_CHANGE:
1535                 /* Forbid underlaying device to change its type. */
1536                 return NOTIFY_BAD;
1537
1538         case NETDEV_NOTIFY_PEERS:
1539         case NETDEV_BONDING_FAILOVER:
1540         case NETDEV_RESEND_IGMP:
1541                 /* Propagate to all vlans */
1542                 list_for_each_entry(vlan, &port->vlans, list)
1543                         call_netdevice_notifiers(event, vlan->dev);
1544         }
1545         return NOTIFY_DONE;
1546 }
1547
1548 static struct notifier_block macvlan_notifier_block __read_mostly = {
1549         .notifier_call  = macvlan_device_event,
1550 };
1551
1552 static int __init macvlan_init_module(void)
1553 {
1554         int err;
1555
1556         register_netdevice_notifier(&macvlan_notifier_block);
1557
1558         err = macvlan_link_register(&macvlan_link_ops);
1559         if (err < 0)
1560                 goto err1;
1561         return 0;
1562 err1:
1563         unregister_netdevice_notifier(&macvlan_notifier_block);
1564         return err;
1565 }
1566
1567 static void __exit macvlan_cleanup_module(void)
1568 {
1569         rtnl_link_unregister(&macvlan_link_ops);
1570         unregister_netdevice_notifier(&macvlan_notifier_block);
1571 }
1572
1573 module_init(macvlan_init_module);
1574 module_exit(macvlan_cleanup_module);
1575
1576 MODULE_LICENSE("GPL");
1577 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1578 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1579 MODULE_ALIAS_RTNL_LINK("macvlan");