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 sk_buff_head     bc_queue;
  47         struct work_struct      bc_work;
  48         bool                    passthru;
  49         int                     count;
  50         struct hlist_head       vlan_source_hash[MACVLAN_HASH_SIZE];
  51         DECLARE_BITMAP(mc_filter, MACVLAN_MC_FILTER_SZ);
  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 bool 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 true;
 190
 191         if (macvlan_hash_lookup(port, addr))
 192                 return true;
 193
 194         return false;
 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                 if (src)
 309                         dev_put(src->dev);
 310                 kfree_skb(skb);
 311         }
 312 }
 313
 314 static void macvlan_broadcast_enqueue(struct macvlan_port *port,
 315                                       const struct macvlan_dev *src,
 316                                       struct sk_buff *skb)
 317 {
 318         struct sk_buff *nskb;
 319         int err = -ENOMEM;
 320
 321         nskb = skb_clone(skb, GFP_ATOMIC);
 322         if (!nskb)
 323                 goto err;
 324
 325         MACVLAN_SKB_CB(nskb)->src = src;
 326
 327         spin_lock(&port->bc_queue.lock);
 328         if (skb_queue_len(&port->bc_queue) < MACVLAN_BC_QUEUE_LEN) {
 329                 if (src)
 330                         dev_hold(src->dev);
 331                 __skb_queue_tail(&port->bc_queue, nskb);
 332                 err = 0;
 333         }
 334         spin_unlock(&port->bc_queue.lock);
 335
 336         if (err)
 337                 goto free_nskb;
 338
 339         schedule_work(&port->bc_work);
 340         return;
 341
 342 free_nskb:
 343         kfree_skb(nskb);
 344 err:
 345         atomic_long_inc(&skb->dev->rx_dropped);
 346 }
 347
 348 static void macvlan_flush_sources(struct macvlan_port *port,
 349                                   struct macvlan_dev *vlan)
 350 {
 351         int i;
 352
 353         for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
 354                 struct hlist_node *h, *n;
 355
 356                 hlist_for_each_safe(h, n, &port->vlan_source_hash[i]) {
 357                         struct macvlan_source_entry *entry;
 358
 359                         entry = hlist_entry(h, struct macvlan_source_entry,
 360                                             hlist);
 361                         if (entry->vlan == vlan)
 362                                 macvlan_hash_del_source(entry);
 363                 }
 364         }
 365         vlan->macaddr_count = 0;
 366 }
 367
 368 static void macvlan_forward_source_one(struct sk_buff *skb,
 369                                        struct macvlan_dev *vlan)
 370 {
 371         struct sk_buff *nskb;
 372         struct net_device *dev;
 373         int len;
 374         int ret;
 375
 376         dev = vlan->dev;
 377         if (unlikely(!(dev->flags & IFF_UP)))
 378                 return;
 379
 380         nskb = skb_clone(skb, GFP_ATOMIC);
 381         if (!nskb)
 382                 return;
 383
 384         len = nskb->len + ETH_HLEN;
 385         nskb->dev = dev;
 386         nskb->pkt_type = PACKET_HOST;
 387
 388         ret = netif_rx(nskb);
 389         macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
 390 }
 391
 392 static void macvlan_forward_source(struct sk_buff *skb,
 393                                    struct macvlan_port *port,
 394                                    const unsigned char *addr)
 395 {
 396         struct macvlan_source_entry *entry;
 397         u32 idx = macvlan_eth_hash(addr);
 398         struct hlist_head *h = &port->vlan_source_hash[idx];
 399
 400         hlist_for_each_entry_rcu(entry, h, hlist) {
 401                 if (ether_addr_equal_64bits(entry->addr, addr))
 402                         macvlan_forward_source_one(skb, entry->vlan);
 403         }
 404 }
 405
 406 /* called under rcu_read_lock() from netif_receive_skb */
 407 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
 408 {
 409         struct macvlan_port *port;
 410         struct sk_buff *skb = *pskb;
 411         const struct ethhdr *eth = eth_hdr(skb);
 412         const struct macvlan_dev *vlan;
 413         const struct macvlan_dev *src;
 414         struct net_device *dev;
 415         unsigned int len = 0;
 416         int ret;
 417         rx_handler_result_t handle_res;
 418
 419         port = macvlan_port_get_rcu(skb->dev);
 420         if (is_multicast_ether_addr(eth->h_dest)) {
 421                 unsigned int hash;
 422
 423                 skb = ip_check_defrag(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN);
 424                 if (!skb)
 425                         return RX_HANDLER_CONSUMED;
 426                 *pskb = skb;
 427                 eth = eth_hdr(skb);
 428                 macvlan_forward_source(skb, port, eth->h_source);
 429                 src = macvlan_hash_lookup(port, eth->h_source);
 430                 if (src && src->mode != MACVLAN_MODE_VEPA &&
 431                     src->mode != MACVLAN_MODE_BRIDGE) {
 432                         /* forward to original port. */
 433                         vlan = src;
 434                         ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
 435                               netif_rx(skb);
 436                         handle_res = RX_HANDLER_CONSUMED;
 437                         goto out;
 438                 }
 439
 440                 hash = mc_hash(NULL, eth->h_dest);
 441                 if (test_bit(hash, port->mc_filter))
 442                         macvlan_broadcast_enqueue(port, src, skb);
 443
 444                 return RX_HANDLER_PASS;
 445         }
 446
 447         macvlan_forward_source(skb, port, eth->h_source);
 448         if (port->passthru)
 449                 vlan = list_first_or_null_rcu(&port->vlans,
 450                                               struct macvlan_dev, list);
 451         else
 452                 vlan = macvlan_hash_lookup(port, eth->h_dest);
 453         if (vlan == NULL)
 454                 return RX_HANDLER_PASS;
 455
 456         dev = vlan->dev;
 457         if (unlikely(!(dev->flags & IFF_UP))) {
 458                 kfree_skb(skb);
 459                 return RX_HANDLER_CONSUMED;
 460         }
 461         len = skb->len + ETH_HLEN;
 462         skb = skb_share_check(skb, GFP_ATOMIC);
 463         if (!skb) {
 464                 ret = NET_RX_DROP;
 465                 handle_res = RX_HANDLER_CONSUMED;
 466                 goto out;
 467         }
 468
 469         *pskb = skb;
 470         skb->dev = dev;
 471         skb->pkt_type = PACKET_HOST;
 472
 473         ret = NET_RX_SUCCESS;
 474         handle_res = RX_HANDLER_ANOTHER;
 475 out:
 476         macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
 477         return handle_res;
 478 }
 479
 480 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
 481 {
 482         const struct macvlan_dev *vlan = netdev_priv(dev);
 483         const struct macvlan_port *port = vlan->port;
 484         const struct macvlan_dev *dest;
 485
 486         if (vlan->mode == MACVLAN_MODE_BRIDGE) {
 487                 const struct ethhdr *eth = (void *)skb->data;
 488
 489                 /* send to other bridge ports directly */
 490                 if (is_multicast_ether_addr(eth->h_dest)) {
 491                         macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
 492                         goto xmit_world;
 493                 }
 494
 495                 dest = macvlan_hash_lookup(port, eth->h_dest);
 496                 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
 497                         /* send to lowerdev first for its network taps */
 498                         dev_forward_skb(vlan->lowerdev, skb);
 499
 500                         return NET_XMIT_SUCCESS;
 501                 }
 502         }
 503
 504 xmit_world:
 505         skb->dev = vlan->lowerdev;
 506         return dev_queue_xmit(skb);
 507 }
 508
 509 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
 510 {
 511 #ifdef CONFIG_NET_POLL_CONTROLLER
 512         if (vlan->netpoll)
 513                 netpoll_send_skb(vlan->netpoll, skb);
 514 #else
 515         BUG();
 516 #endif
 517         return NETDEV_TX_OK;
 518 }
 519
 520 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
 521                                       struct net_device *dev)
 522 {
 523         unsigned int len = skb->len;
 524         int ret;
 525         struct macvlan_dev *vlan = netdev_priv(dev);
 526
 527         if (unlikely(netpoll_tx_running(dev)))
 528                 return macvlan_netpoll_send_skb(vlan, skb);
 529
 530         if (vlan->fwd_priv) {
 531                 skb->dev = vlan->lowerdev;
 532                 ret = dev_queue_xmit_accel(skb, vlan->fwd_priv);
 533         } else {
 534                 ret = macvlan_queue_xmit(skb, dev);
 535         }
 536
 537         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 538                 struct vlan_pcpu_stats *pcpu_stats;
 539
 540                 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
 541                 u64_stats_update_begin(&pcpu_stats->syncp);
 542                 pcpu_stats->tx_packets++;
 543                 pcpu_stats->tx_bytes += len;
 544                 u64_stats_update_end(&pcpu_stats->syncp);
 545         } else {
 546                 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
 547         }
 548         return ret;
 549 }
 550
 551 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
 552                                unsigned short type, const void *daddr,
 553                                const void *saddr, unsigned len)
 554 {
 555         const struct macvlan_dev *vlan = netdev_priv(dev);
 556         struct net_device *lowerdev = vlan->lowerdev;
 557
 558         return dev_hard_header(skb, lowerdev, type, daddr,
 559                                saddr ? : dev->dev_addr, len);
 560 }
 561
 562 static const struct header_ops macvlan_hard_header_ops = {
 563         .create         = macvlan_hard_header,
 564         .parse          = eth_header_parse,
 565         .cache          = eth_header_cache,
 566         .cache_update   = eth_header_cache_update,
 567 };
 568
 569 static struct rtnl_link_ops macvlan_link_ops;
 570
 571 static int macvlan_open(struct net_device *dev)
 572 {
 573         struct macvlan_dev *vlan = netdev_priv(dev);
 574         struct net_device *lowerdev = vlan->lowerdev;
 575         int err;
 576
 577         if (vlan->port->passthru) {
 578                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
 579                         err = dev_set_promiscuity(lowerdev, 1);
 580                         if (err < 0)
 581                                 goto out;
 582                 }
 583                 goto hash_add;
 584         }
 585
 586         if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD &&
 587             dev->rtnl_link_ops == &macvlan_link_ops) {
 588                 vlan->fwd_priv =
 589                       lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
 590
 591                 /* If we get a NULL pointer back, or if we get an error
 592                  * then we should just fall through to the non accelerated path
 593                  */
 594                 if (IS_ERR_OR_NULL(vlan->fwd_priv)) {
 595                         vlan->fwd_priv = NULL;
 596                 } else
 597                         return 0;
 598         }
 599
 600         err = -EBUSY;
 601         if (macvlan_addr_busy(vlan->port, dev->dev_addr))
 602                 goto out;
 603
 604         err = dev_uc_add(lowerdev, dev->dev_addr);
 605         if (err < 0)
 606                 goto out;
 607         if (dev->flags & IFF_ALLMULTI) {
 608                 err = dev_set_allmulti(lowerdev, 1);
 609                 if (err < 0)
 610                         goto del_unicast;
 611         }
 612
 613         if (dev->flags & IFF_PROMISC) {
 614                 err = dev_set_promiscuity(lowerdev, 1);
 615                 if (err < 0)
 616                         goto clear_multi;
 617         }
 618
 619 hash_add:
 620         macvlan_hash_add(vlan);
 621         return 0;
 622
 623 clear_multi:
 624         if (dev->flags & IFF_ALLMULTI)
 625                 dev_set_allmulti(lowerdev, -1);
 626 del_unicast:
 627         dev_uc_del(lowerdev, dev->dev_addr);
 628 out:
 629         if (vlan->fwd_priv) {
 630                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
 631                                                            vlan->fwd_priv);
 632                 vlan->fwd_priv = NULL;
 633         }
 634         return err;
 635 }
 636
 637 static int macvlan_stop(struct net_device *dev)
 638 {
 639         struct macvlan_dev *vlan = netdev_priv(dev);
 640         struct net_device *lowerdev = vlan->lowerdev;
 641
 642         if (vlan->fwd_priv) {
 643                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
 644                                                            vlan->fwd_priv);
 645                 vlan->fwd_priv = NULL;
 646                 return 0;
 647         }
 648
 649         dev_uc_unsync(lowerdev, dev);
 650         dev_mc_unsync(lowerdev, dev);
 651
 652         if (vlan->port->passthru) {
 653                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
 654                         dev_set_promiscuity(lowerdev, -1);
 655                 goto hash_del;
 656         }
 657
 658         if (dev->flags & IFF_ALLMULTI)
 659                 dev_set_allmulti(lowerdev, -1);
 660
 661         if (dev->flags & IFF_PROMISC)
 662                 dev_set_promiscuity(lowerdev, -1);
 663
 664         dev_uc_del(lowerdev, dev->dev_addr);
 665
 666 hash_del:
 667         macvlan_hash_del(vlan, !dev->dismantle);
 668         return 0;
 669 }
 670
 671 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
 672 {
 673         struct macvlan_dev *vlan = netdev_priv(dev);
 674         struct net_device *lowerdev = vlan->lowerdev;
 675         int err;
 676
 677         if (!(dev->flags & IFF_UP)) {
 678                 /* Just copy in the new address */
 679                 ether_addr_copy(dev->dev_addr, addr);
 680         } else {
 681                 /* Rehash and update the device filters */
 682                 if (macvlan_addr_busy(vlan->port, addr))
 683                         return -EBUSY;
 684
 685                 if (!vlan->port->passthru) {
 686                         err = dev_uc_add(lowerdev, addr);
 687                         if (err)
 688                                 return err;
 689
 690                         dev_uc_del(lowerdev, dev->dev_addr);
 691                 }
 692
 693                 macvlan_hash_change_addr(vlan, addr);
 694         }
 695         return 0;
 696 }
 697
 698 static int macvlan_set_mac_address(struct net_device *dev, void *p)
 699 {
 700         struct macvlan_dev *vlan = netdev_priv(dev);
 701         struct sockaddr *addr = p;
 702
 703         if (!is_valid_ether_addr(addr->sa_data))
 704                 return -EADDRNOTAVAIL;
 705
 706         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
 707                 dev_set_mac_address(vlan->lowerdev, addr);
 708                 return 0;
 709         }
 710
 711         return macvlan_sync_address(dev, addr->sa_data);
 712 }
 713
 714 static void macvlan_change_rx_flags(struct net_device *dev, int change)
 715 {
 716         struct macvlan_dev *vlan = netdev_priv(dev);
 717         struct net_device *lowerdev = vlan->lowerdev;
 718
 719         if (dev->flags & IFF_UP) {
 720                 if (change & IFF_ALLMULTI)
 721                         dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 722                 if (change & IFF_PROMISC)
 723                         dev_set_promiscuity(lowerdev,
 724                                             dev->flags & IFF_PROMISC ? 1 : -1);
 725
 726         }
 727 }
 728
 729 static void macvlan_compute_filter(unsigned long *mc_filter,
 730                                    struct net_device *dev,
 731                                    struct macvlan_dev *vlan)
 732 {
 733         if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
 734                 bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ);
 735         } else {
 736                 struct netdev_hw_addr *ha;
 737                 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
 738
 739                 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
 740                 netdev_for_each_mc_addr(ha, dev) {
 741                         __set_bit(mc_hash(vlan, ha->addr), filter);
 742                 }
 743
 744                 __set_bit(mc_hash(vlan, dev->broadcast), filter);
 745
 746                 bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ);
 747         }
 748 }
 749
 750 static void macvlan_set_mac_lists(struct net_device *dev)
 751 {
 752         struct macvlan_dev *vlan = netdev_priv(dev);
 753
 754         macvlan_compute_filter(vlan->mc_filter, dev, vlan);
 755
 756         dev_uc_sync(vlan->lowerdev, dev);
 757         dev_mc_sync(vlan->lowerdev, dev);
 758
 759         /* This is slightly inaccurate as we're including the subscription
 760          * list of vlan->lowerdev too.
 761          *
 762          * Bug alert: This only works if everyone has the same broadcast
 763          * address as lowerdev.  As soon as someone changes theirs this
 764          * will break.
 765          *
 766          * However, this is already broken as when you change your broadcast
 767          * address we don't get called.
 768          *
 769          * The solution is to maintain a list of broadcast addresses like
 770          * we do for uc/mc, if you care.
 771          */
 772         macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL);
 773 }
 774
 775 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
 776 {
 777         struct macvlan_dev *vlan = netdev_priv(dev);
 778
 779         if (vlan->lowerdev->mtu < new_mtu)
 780                 return -EINVAL;
 781         dev->mtu = new_mtu;
 782         return 0;
 783 }
 784
 785 /*
 786  * macvlan network devices have devices nesting below it and are a special
 787  * "super class" of normal network devices; split their locks off into a
 788  * separate class since they always nest.
 789  */
 790 static struct lock_class_key macvlan_netdev_addr_lock_key;
 791
 792 #define ALWAYS_ON_FEATURES \
 793         (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | NETIF_F_LLTX | \
 794          NETIF_F_GSO_ROBUST)
 795
 796 #define MACVLAN_FEATURES \
 797         (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
 798          NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_LRO | \
 799          NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
 800          NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
 801
 802 #define MACVLAN_STATE_MASK \
 803         ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
 804
 805 static int macvlan_get_nest_level(struct net_device *dev)
 806 {
 807         return ((struct macvlan_dev *)netdev_priv(dev))->nest_level;
 808 }
 809
 810 static void macvlan_set_lockdep_class(struct net_device *dev)
 811 {
 812         netdev_lockdep_set_classes(dev);
 813         lockdep_set_class_and_subclass(&dev->addr_list_lock,
 814                                        &macvlan_netdev_addr_lock_key,
 815                                        macvlan_get_nest_level(dev));
 816 }
 817
 818 static int macvlan_init(struct net_device *dev)
 819 {
 820         struct macvlan_dev *vlan = netdev_priv(dev);
 821         const struct net_device *lowerdev = vlan->lowerdev;
 822         struct macvlan_port *port = vlan->port;
 823
 824         dev->state              = (dev->state & ~MACVLAN_STATE_MASK) |
 825                                   (lowerdev->state & MACVLAN_STATE_MASK);
 826         dev->features           = lowerdev->features & MACVLAN_FEATURES;
 827         dev->features           |= ALWAYS_ON_FEATURES;
 828         dev->hw_features        |= NETIF_F_LRO;
 829         dev->vlan_features      = lowerdev->vlan_features & MACVLAN_FEATURES;
 830         dev->gso_max_size       = lowerdev->gso_max_size;
 831         dev->gso_max_segs       = lowerdev->gso_max_segs;
 832         dev->hard_header_len    = lowerdev->hard_header_len;
 833
 834         macvlan_set_lockdep_class(dev);
 835
 836         vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
 837         if (!vlan->pcpu_stats)
 838                 return -ENOMEM;
 839
 840         port->count += 1;
 841
 842         return 0;
 843 }
 844
 845 static void macvlan_uninit(struct net_device *dev)
 846 {
 847         struct macvlan_dev *vlan = netdev_priv(dev);
 848         struct macvlan_port *port = vlan->port;
 849
 850         free_percpu(vlan->pcpu_stats);
 851
 852         macvlan_flush_sources(port, vlan);
 853         port->count -= 1;
 854         if (!port->count)
 855                 macvlan_port_destroy(port->dev);
 856 }
 857
 858 static void macvlan_dev_get_stats64(struct net_device *dev,
 859                                     struct rtnl_link_stats64 *stats)
 860 {
 861         struct macvlan_dev *vlan = netdev_priv(dev);
 862
 863         if (vlan->pcpu_stats) {
 864                 struct vlan_pcpu_stats *p;
 865                 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
 866                 u32 rx_errors = 0, tx_dropped = 0;
 867                 unsigned int start;
 868                 int i;
 869
 870                 for_each_possible_cpu(i) {
 871                         p = per_cpu_ptr(vlan->pcpu_stats, i);
 872                         do {
 873                                 start = u64_stats_fetch_begin_irq(&p->syncp);
 874                                 rx_packets      = p->rx_packets;
 875                                 rx_bytes        = p->rx_bytes;
 876                                 rx_multicast    = p->rx_multicast;
 877                                 tx_packets      = p->tx_packets;
 878                                 tx_bytes        = p->tx_bytes;
 879                         } while (u64_stats_fetch_retry_irq(&p->syncp, start));
 880
 881                         stats->rx_packets       += rx_packets;
 882                         stats->rx_bytes         += rx_bytes;
 883                         stats->multicast        += rx_multicast;
 884                         stats->tx_packets       += tx_packets;
 885                         stats->tx_bytes         += tx_bytes;
 886                         /* rx_errors & tx_dropped are u32, updated
 887                          * without syncp protection.
 888                          */
 889                         rx_errors       += p->rx_errors;
 890                         tx_dropped      += p->tx_dropped;
 891                 }
 892                 stats->rx_errors        = rx_errors;
 893                 stats->rx_dropped       = rx_errors;
 894                 stats->tx_dropped       = tx_dropped;
 895         }
 896 }
 897
 898 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
 899                                    __be16 proto, u16 vid)
 900 {
 901         struct macvlan_dev *vlan = netdev_priv(dev);
 902         struct net_device *lowerdev = vlan->lowerdev;
 903
 904         return vlan_vid_add(lowerdev, proto, vid);
 905 }
 906
 907 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
 908                                     __be16 proto, u16 vid)
 909 {
 910         struct macvlan_dev *vlan = netdev_priv(dev);
 911         struct net_device *lowerdev = vlan->lowerdev;
 912
 913         vlan_vid_del(lowerdev, proto, vid);
 914         return 0;
 915 }
 916
 917 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 918                            struct net_device *dev,
 919                            const unsigned char *addr, u16 vid,
 920                            u16 flags)
 921 {
 922         struct macvlan_dev *vlan = netdev_priv(dev);
 923         int err = -EINVAL;
 924
 925         /* Support unicast filter only on passthru devices.
 926          * Multicast filter should be allowed on all devices.
 927          */
 928         if (!vlan->port->passthru && is_unicast_ether_addr(addr))
 929                 return -EOPNOTSUPP;
 930
 931         if (flags & NLM_F_REPLACE)
 932                 return -EOPNOTSUPP;
 933
 934         if (is_unicast_ether_addr(addr))
 935                 err = dev_uc_add_excl(dev, addr);
 936         else if (is_multicast_ether_addr(addr))
 937                 err = dev_mc_add_excl(dev, addr);
 938
 939         return err;
 940 }
 941
 942 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
 943                            struct net_device *dev,
 944                            const unsigned char *addr, u16 vid)
 945 {
 946         struct macvlan_dev *vlan = netdev_priv(dev);
 947         int err = -EINVAL;
 948
 949         /* Support unicast filter only on passthru devices.
 950          * Multicast filter should be allowed on all devices.
 951          */
 952         if (!vlan->port->passthru && is_unicast_ether_addr(addr))
 953                 return -EOPNOTSUPP;
 954
 955         if (is_unicast_ether_addr(addr))
 956                 err = dev_uc_del(dev, addr);
 957         else if (is_multicast_ether_addr(addr))
 958                 err = dev_mc_del(dev, addr);
 959
 960         return err;
 961 }
 962
 963 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
 964                                         struct ethtool_drvinfo *drvinfo)
 965 {
 966         strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
 967         strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
 968 }
 969
 970 static int macvlan_ethtool_get_link_ksettings(struct net_device *dev,
 971                                               struct ethtool_link_ksettings *cmd)
 972 {
 973         const struct macvlan_dev *vlan = netdev_priv(dev);
 974
 975         return __ethtool_get_link_ksettings(vlan->lowerdev, cmd);
 976 }
 977
 978 static netdev_features_t macvlan_fix_features(struct net_device *dev,
 979                                               netdev_features_t features)
 980 {
 981         struct macvlan_dev *vlan = netdev_priv(dev);
 982         netdev_features_t lowerdev_features = vlan->lowerdev->features;
 983         netdev_features_t mask;
 984
 985         features |= NETIF_F_ALL_FOR_ALL;
 986         features &= (vlan->set_features | ~MACVLAN_FEATURES);
 987         mask = features;
 988
 989         lowerdev_features &= (features | ~NETIF_F_LRO);
 990         features = netdev_increment_features(lowerdev_features, features, mask);
 991         features |= ALWAYS_ON_FEATURES;
 992         features &= ~NETIF_F_NETNS_LOCAL;
 993
 994         return features;
 995 }
 996
 997 #ifdef CONFIG_NET_POLL_CONTROLLER
 998 static void macvlan_dev_poll_controller(struct net_device *dev)
 999 {
1000         return;
1001 }
1002
1003 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
1004 {
1005         struct macvlan_dev *vlan = netdev_priv(dev);
1006         struct net_device *real_dev = vlan->lowerdev;
1007         struct netpoll *netpoll;
1008         int err = 0;
1009
1010         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
1011         err = -ENOMEM;
1012         if (!netpoll)
1013                 goto out;
1014
1015         err = __netpoll_setup(netpoll, real_dev);
1016         if (err) {
1017                 kfree(netpoll);
1018                 goto out;
1019         }
1020
1021         vlan->netpoll = netpoll;
1022
1023 out:
1024         return err;
1025 }
1026
1027 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
1028 {
1029         struct macvlan_dev *vlan = netdev_priv(dev);
1030         struct netpoll *netpoll = vlan->netpoll;
1031
1032         if (!netpoll)
1033                 return;
1034
1035         vlan->netpoll = NULL;
1036
1037         __netpoll_free_async(netpoll);
1038 }
1039 #endif  /* CONFIG_NET_POLL_CONTROLLER */
1040
1041 static int macvlan_dev_get_iflink(const struct net_device *dev)
1042 {
1043         struct macvlan_dev *vlan = netdev_priv(dev);
1044
1045         return vlan->lowerdev->ifindex;
1046 }
1047
1048 static const struct ethtool_ops macvlan_ethtool_ops = {
1049         .get_link               = ethtool_op_get_link,
1050         .get_link_ksettings     = macvlan_ethtool_get_link_ksettings,
1051         .get_drvinfo            = macvlan_ethtool_get_drvinfo,
1052 };
1053
1054 static const struct net_device_ops macvlan_netdev_ops = {
1055         .ndo_init               = macvlan_init,
1056         .ndo_uninit             = macvlan_uninit,
1057         .ndo_open               = macvlan_open,
1058         .ndo_stop               = macvlan_stop,
1059         .ndo_start_xmit         = macvlan_start_xmit,
1060         .ndo_change_mtu         = macvlan_change_mtu,
1061         .ndo_fix_features       = macvlan_fix_features,
1062         .ndo_change_rx_flags    = macvlan_change_rx_flags,
1063         .ndo_set_mac_address    = macvlan_set_mac_address,
1064         .ndo_set_rx_mode        = macvlan_set_mac_lists,
1065         .ndo_get_stats64        = macvlan_dev_get_stats64,
1066         .ndo_validate_addr      = eth_validate_addr,
1067         .ndo_vlan_rx_add_vid    = macvlan_vlan_rx_add_vid,
1068         .ndo_vlan_rx_kill_vid   = macvlan_vlan_rx_kill_vid,
1069         .ndo_fdb_add            = macvlan_fdb_add,
1070         .ndo_fdb_del            = macvlan_fdb_del,
1071         .ndo_fdb_dump           = ndo_dflt_fdb_dump,
1072         .ndo_get_lock_subclass  = macvlan_get_nest_level,
1073 #ifdef CONFIG_NET_POLL_CONTROLLER
1074         .ndo_poll_controller    = macvlan_dev_poll_controller,
1075         .ndo_netpoll_setup      = macvlan_dev_netpoll_setup,
1076         .ndo_netpoll_cleanup    = macvlan_dev_netpoll_cleanup,
1077 #endif
1078         .ndo_get_iflink         = macvlan_dev_get_iflink,
1079         .ndo_features_check     = passthru_features_check,
1080 };
1081
1082 void macvlan_common_setup(struct net_device *dev)
1083 {
1084         ether_setup(dev);
1085
1086         dev->min_mtu            = 0;
1087         dev->max_mtu            = ETH_MAX_MTU;
1088         dev->priv_flags        &= ~IFF_TX_SKB_SHARING;
1089         netif_keep_dst(dev);
1090         dev->priv_flags        |= IFF_UNICAST_FLT;
1091         dev->netdev_ops         = &macvlan_netdev_ops;
1092         dev->destructor         = free_netdev;
1093         dev->header_ops         = &macvlan_hard_header_ops;
1094         dev->ethtool_ops        = &macvlan_ethtool_ops;
1095 }
1096 EXPORT_SYMBOL_GPL(macvlan_common_setup);
1097
1098 static void macvlan_setup(struct net_device *dev)
1099 {
1100         macvlan_common_setup(dev);
1101         dev->priv_flags |= IFF_NO_QUEUE;
1102 }
1103
1104 static int macvlan_port_create(struct net_device *dev)
1105 {
1106         struct macvlan_port *port;
1107         unsigned int i;
1108         int err;
1109
1110         if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1111                 return -EINVAL;
1112
1113         if (netdev_is_rx_handler_busy(dev))
1114                 return -EBUSY;
1115
1116         port = kzalloc(sizeof(*port), GFP_KERNEL);
1117         if (port == NULL)
1118                 return -ENOMEM;
1119
1120         port->passthru = false;
1121         port->dev = dev;
1122         INIT_LIST_HEAD(&port->vlans);
1123         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1124                 INIT_HLIST_HEAD(&port->vlan_hash[i]);
1125         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1126                 INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1127
1128         skb_queue_head_init(&port->bc_queue);
1129         INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1130
1131         err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1132         if (err)
1133                 kfree(port);
1134         else
1135                 dev->priv_flags |= IFF_MACVLAN_PORT;
1136         return err;
1137 }
1138
1139 static void macvlan_port_destroy(struct net_device *dev)
1140 {
1141         struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1142         struct sk_buff *skb;
1143
1144         dev->priv_flags &= ~IFF_MACVLAN_PORT;
1145         netdev_rx_handler_unregister(dev);
1146
1147         /* After this point, no packet can schedule bc_work anymore,
1148          * but we need to cancel it and purge left skbs if any.
1149          */
1150         cancel_work_sync(&port->bc_work);
1151
1152         while ((skb = __skb_dequeue(&port->bc_queue))) {
1153                 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
1154
1155                 if (src)
1156                         dev_put(src->dev);
1157
1158                 kfree_skb(skb);
1159         }
1160
1161         kfree(port);
1162 }
1163
1164 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
1165 {
1166         if (tb[IFLA_ADDRESS]) {
1167                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1168                         return -EINVAL;
1169                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1170                         return -EADDRNOTAVAIL;
1171         }
1172
1173         if (data && data[IFLA_MACVLAN_FLAGS] &&
1174             nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
1175                 return -EINVAL;
1176
1177         if (data && data[IFLA_MACVLAN_MODE]) {
1178                 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1179                 case MACVLAN_MODE_PRIVATE:
1180                 case MACVLAN_MODE_VEPA:
1181                 case MACVLAN_MODE_BRIDGE:
1182                 case MACVLAN_MODE_PASSTHRU:
1183                 case MACVLAN_MODE_SOURCE:
1184                         break;
1185                 default:
1186                         return -EINVAL;
1187                 }
1188         }
1189
1190         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1191                 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1192                 case MACVLAN_MACADDR_ADD:
1193                 case MACVLAN_MACADDR_DEL:
1194                 case MACVLAN_MACADDR_FLUSH:
1195                 case MACVLAN_MACADDR_SET:
1196                         break;
1197                 default:
1198                         return -EINVAL;
1199                 }
1200         }
1201
1202         if (data && data[IFLA_MACVLAN_MACADDR]) {
1203                 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1204                         return -EINVAL;
1205
1206                 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1207                         return -EADDRNOTAVAIL;
1208         }
1209
1210         if (data && data[IFLA_MACVLAN_MACADDR_COUNT])
1211                 return -EINVAL;
1212
1213         return 0;
1214 }
1215
1216 /**
1217  * reconfigure list of remote source mac address
1218  * (only for macvlan devices in source mode)
1219  * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1220  * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1221  */
1222 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1223                                       struct nlattr *data[])
1224 {
1225         char *addr = NULL;
1226         int ret, rem, len;
1227         struct nlattr *nla, *head;
1228         struct macvlan_source_entry *entry;
1229
1230         if (data[IFLA_MACVLAN_MACADDR])
1231                 addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1232
1233         if (mode == MACVLAN_MACADDR_ADD) {
1234                 if (!addr)
1235                         return -EINVAL;
1236
1237                 return macvlan_hash_add_source(vlan, addr);
1238
1239         } else if (mode == MACVLAN_MACADDR_DEL) {
1240                 if (!addr)
1241                         return -EINVAL;
1242
1243                 entry = macvlan_hash_lookup_source(vlan, addr);
1244                 if (entry) {
1245                         macvlan_hash_del_source(entry);
1246                         vlan->macaddr_count--;
1247                 }
1248         } else if (mode == MACVLAN_MACADDR_FLUSH) {
1249                 macvlan_flush_sources(vlan->port, vlan);
1250         } else if (mode == MACVLAN_MACADDR_SET) {
1251                 macvlan_flush_sources(vlan->port, vlan);
1252
1253                 if (addr) {
1254                         ret = macvlan_hash_add_source(vlan, addr);
1255                         if (ret)
1256                                 return ret;
1257                 }
1258
1259                 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA])
1260                         return 0;
1261
1262                 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1263                 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1264
1265                 nla_for_each_attr(nla, head, len, rem) {
1266                         if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1267                             nla_len(nla) != ETH_ALEN)
1268                                 continue;
1269
1270                         addr = nla_data(nla);
1271                         ret = macvlan_hash_add_source(vlan, addr);
1272                         if (ret)
1273                                 return ret;
1274                 }
1275         } else {
1276                 return -EINVAL;
1277         }
1278
1279         return 0;
1280 }
1281
1282 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1283                            struct nlattr *tb[], struct nlattr *data[])
1284 {
1285         struct macvlan_dev *vlan = netdev_priv(dev);
1286         struct macvlan_port *port;
1287         struct net_device *lowerdev;
1288         int err;
1289         int macmode;
1290         bool create = false;
1291
1292         if (!tb[IFLA_LINK])
1293                 return -EINVAL;
1294
1295         lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1296         if (lowerdev == NULL)
1297                 return -ENODEV;
1298
1299         /* When creating macvlans or macvtaps on top of other macvlans - use
1300          * the real device as the lowerdev.
1301          */
1302         if (netif_is_macvlan(lowerdev))
1303                 lowerdev = macvlan_dev_real_dev(lowerdev);
1304
1305         if (!tb[IFLA_MTU])
1306                 dev->mtu = lowerdev->mtu;
1307         else if (dev->mtu > lowerdev->mtu)
1308                 return -EINVAL;
1309
1310         /* MTU range: 68 - lowerdev->max_mtu */
1311         dev->min_mtu = ETH_MIN_MTU;
1312         dev->max_mtu = lowerdev->max_mtu;
1313
1314         if (!tb[IFLA_ADDRESS])
1315                 eth_hw_addr_random(dev);
1316
1317         if (!macvlan_port_exists(lowerdev)) {
1318                 err = macvlan_port_create(lowerdev);
1319                 if (err < 0)
1320                         return err;
1321                 create = true;
1322         }
1323         port = macvlan_port_get_rtnl(lowerdev);
1324
1325         /* Only 1 macvlan device can be created in passthru mode */
1326         if (port->passthru) {
1327                 /* The macvlan port must be not created this time,
1328                  * still goto destroy_macvlan_port for readability.
1329                  */
1330                 err = -EINVAL;
1331                 goto destroy_macvlan_port;
1332         }
1333
1334         vlan->lowerdev = lowerdev;
1335         vlan->dev      = dev;
1336         vlan->port     = port;
1337         vlan->set_features = MACVLAN_FEATURES;
1338         vlan->nest_level = dev_get_nest_level(lowerdev) + 1;
1339
1340         vlan->mode     = MACVLAN_MODE_VEPA;
1341         if (data && data[IFLA_MACVLAN_MODE])
1342                 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1343
1344         if (data && data[IFLA_MACVLAN_FLAGS])
1345                 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1346
1347         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1348                 if (port->count) {
1349                         err = -EINVAL;
1350                         goto destroy_macvlan_port;
1351                 }
1352                 port->passthru = true;
1353                 eth_hw_addr_inherit(dev, lowerdev);
1354         }
1355
1356         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1357                 if (vlan->mode != MACVLAN_MODE_SOURCE) {
1358                         err = -EINVAL;
1359                         goto destroy_macvlan_port;
1360                 }
1361                 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1362                 err = macvlan_changelink_sources(vlan, macmode, data);
1363                 if (err)
1364                         goto destroy_macvlan_port;
1365         }
1366
1367         err = register_netdevice(dev);
1368         if (err < 0)
1369                 goto destroy_macvlan_port;
1370
1371         dev->priv_flags |= IFF_MACVLAN;
1372         err = netdev_upper_dev_link(lowerdev, dev);
1373         if (err)
1374                 goto unregister_netdev;
1375
1376         list_add_tail_rcu(&vlan->list, &port->vlans);
1377         netif_stacked_transfer_operstate(lowerdev, dev);
1378         linkwatch_fire_event(dev);
1379
1380         return 0;
1381
1382 unregister_netdev:
1383         unregister_netdevice(dev);
1384 destroy_macvlan_port:
1385         if (create)
1386                 macvlan_port_destroy(port->dev);
1387         return err;
1388 }
1389 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1390
1391 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1392                            struct nlattr *tb[], struct nlattr *data[])
1393 {
1394         return macvlan_common_newlink(src_net, dev, tb, data);
1395 }
1396
1397 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1398 {
1399         struct macvlan_dev *vlan = netdev_priv(dev);
1400
1401         if (vlan->mode == MACVLAN_MODE_SOURCE)
1402                 macvlan_flush_sources(vlan->port, vlan);
1403         list_del_rcu(&vlan->list);
1404         unregister_netdevice_queue(dev, head);
1405         netdev_upper_dev_unlink(vlan->lowerdev, dev);
1406 }
1407 EXPORT_SYMBOL_GPL(macvlan_dellink);
1408
1409 static int macvlan_changelink(struct net_device *dev,
1410                 struct nlattr *tb[], struct nlattr *data[])
1411 {
1412         struct macvlan_dev *vlan = netdev_priv(dev);
1413         enum macvlan_mode mode;
1414         bool set_mode = false;
1415         enum macvlan_macaddr_mode macmode;
1416         int ret;
1417
1418         /* Validate mode, but don't set yet: setting flags may fail. */
1419         if (data && data[IFLA_MACVLAN_MODE]) {
1420                 set_mode = true;
1421                 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1422                 /* Passthrough mode can't be set or cleared dynamically */
1423                 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1424                     (vlan->mode == MACVLAN_MODE_PASSTHRU))
1425                         return -EINVAL;
1426                 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1427                     vlan->mode != mode)
1428                         macvlan_flush_sources(vlan->port, vlan);
1429         }
1430
1431         if (data && data[IFLA_MACVLAN_FLAGS]) {
1432                 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1433                 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1434                 if (vlan->port->passthru && promisc) {
1435                         int err;
1436
1437                         if (flags & MACVLAN_FLAG_NOPROMISC)
1438                                 err = dev_set_promiscuity(vlan->lowerdev, -1);
1439                         else
1440                                 err = dev_set_promiscuity(vlan->lowerdev, 1);
1441                         if (err < 0)
1442                                 return err;
1443                 }
1444                 vlan->flags = flags;
1445         }
1446         if (set_mode)
1447                 vlan->mode = mode;
1448         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1449                 if (vlan->mode != MACVLAN_MODE_SOURCE)
1450                         return -EINVAL;
1451                 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1452                 ret = macvlan_changelink_sources(vlan, macmode, data);
1453                 if (ret)
1454                         return ret;
1455         }
1456         return 0;
1457 }
1458
1459 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1460 {
1461         if (vlan->macaddr_count == 0)
1462                 return 0;
1463         return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1464                 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1465 }
1466
1467 static size_t macvlan_get_size(const struct net_device *dev)
1468 {
1469         struct macvlan_dev *vlan = netdev_priv(dev);
1470
1471         return (0
1472                 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1473                 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1474                 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1475                 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1476                 );
1477 }
1478
1479 static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1480                                      const struct macvlan_dev *vlan,
1481                                      const int i)
1482 {
1483         struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1484         struct macvlan_source_entry *entry;
1485
1486         hlist_for_each_entry_rcu(entry, h, hlist) {
1487                 if (entry->vlan != vlan)
1488                         continue;
1489                 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1490                         return 1;
1491         }
1492         return 0;
1493 }
1494
1495 static int macvlan_fill_info(struct sk_buff *skb,
1496                                 const struct net_device *dev)
1497 {
1498         struct macvlan_dev *vlan = netdev_priv(dev);
1499         int i;
1500         struct nlattr *nest;
1501
1502         if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1503                 goto nla_put_failure;
1504         if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1505                 goto nla_put_failure;
1506         if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1507                 goto nla_put_failure;
1508         if (vlan->macaddr_count > 0) {
1509                 nest = nla_nest_start(skb, IFLA_MACVLAN_MACADDR_DATA);
1510                 if (nest == NULL)
1511                         goto nla_put_failure;
1512
1513                 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1514                         if (macvlan_fill_info_macaddr(skb, vlan, i))
1515                                 goto nla_put_failure;
1516                 }
1517                 nla_nest_end(skb, nest);
1518         }
1519         return 0;
1520
1521 nla_put_failure:
1522         return -EMSGSIZE;
1523 }
1524
1525 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1526         [IFLA_MACVLAN_MODE]  = { .type = NLA_U32 },
1527         [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1528         [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1529         [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1530         [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1531         [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1532 };
1533
1534 int macvlan_link_register(struct rtnl_link_ops *ops)
1535 {
1536         /* common fields */
1537         ops->validate           = macvlan_validate;
1538         ops->maxtype            = IFLA_MACVLAN_MAX;
1539         ops->policy             = macvlan_policy;
1540         ops->changelink         = macvlan_changelink;
1541         ops->get_size           = macvlan_get_size;
1542         ops->fill_info          = macvlan_fill_info;
1543
1544         return rtnl_link_register(ops);
1545 };
1546 EXPORT_SYMBOL_GPL(macvlan_link_register);
1547
1548 static struct net *macvlan_get_link_net(const struct net_device *dev)
1549 {
1550         return dev_net(macvlan_dev_real_dev(dev));
1551 }
1552
1553 static struct rtnl_link_ops macvlan_link_ops = {
1554         .kind           = "macvlan",
1555         .setup          = macvlan_setup,
1556         .newlink        = macvlan_newlink,
1557         .dellink        = macvlan_dellink,
1558         .get_link_net   = macvlan_get_link_net,
1559         .priv_size      = sizeof(struct macvlan_dev),
1560 };
1561
1562 static int macvlan_device_event(struct notifier_block *unused,
1563                                 unsigned long event, void *ptr)
1564 {
1565         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1566         struct macvlan_dev *vlan, *next;
1567         struct macvlan_port *port;
1568         LIST_HEAD(list_kill);
1569
1570         if (!macvlan_port_exists(dev))
1571                 return NOTIFY_DONE;
1572
1573         port = macvlan_port_get_rtnl(dev);
1574
1575         switch (event) {
1576         case NETDEV_UP:
1577         case NETDEV_CHANGE:
1578                 list_for_each_entry(vlan, &port->vlans, list)
1579                         netif_stacked_transfer_operstate(vlan->lowerdev,
1580                                                          vlan->dev);
1581                 break;
1582         case NETDEV_FEAT_CHANGE:
1583                 list_for_each_entry(vlan, &port->vlans, list) {
1584                         vlan->dev->gso_max_size = dev->gso_max_size;
1585                         vlan->dev->gso_max_segs = dev->gso_max_segs;
1586                         netdev_update_features(vlan->dev);
1587                 }
1588                 break;
1589         case NETDEV_CHANGEMTU:
1590                 list_for_each_entry(vlan, &port->vlans, list) {
1591                         if (vlan->dev->mtu <= dev->mtu)
1592                                 continue;
1593                         dev_set_mtu(vlan->dev, dev->mtu);
1594                 }
1595                 break;
1596         case NETDEV_CHANGEADDR:
1597                 if (!port->passthru)
1598                         return NOTIFY_DONE;
1599
1600                 vlan = list_first_entry_or_null(&port->vlans,
1601                                                 struct macvlan_dev,
1602                                                 list);
1603
1604                 if (macvlan_sync_address(vlan->dev, dev->dev_addr))
1605                         return NOTIFY_BAD;
1606
1607                 break;
1608         case NETDEV_UNREGISTER:
1609                 /* twiddle thumbs on netns device moves */
1610                 if (dev->reg_state != NETREG_UNREGISTERING)
1611                         break;
1612
1613                 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1614                         vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1615                 unregister_netdevice_many(&list_kill);
1616                 break;
1617         case NETDEV_PRE_TYPE_CHANGE:
1618                 /* Forbid underlaying device to change its type. */
1619                 return NOTIFY_BAD;
1620
1621         case NETDEV_NOTIFY_PEERS:
1622         case NETDEV_BONDING_FAILOVER:
1623         case NETDEV_RESEND_IGMP:
1624                 /* Propagate to all vlans */
1625                 list_for_each_entry(vlan, &port->vlans, list)
1626                         call_netdevice_notifiers(event, vlan->dev);
1627         }
1628         return NOTIFY_DONE;
1629 }
1630
1631 static struct notifier_block macvlan_notifier_block __read_mostly = {
1632         .notifier_call  = macvlan_device_event,
1633 };
1634
1635 static int __init macvlan_init_module(void)
1636 {
1637         int err;
1638
1639         register_netdevice_notifier(&macvlan_notifier_block);
1640
1641         err = macvlan_link_register(&macvlan_link_ops);
1642         if (err < 0)
1643                 goto err1;
1644         return 0;
1645 err1:
1646         unregister_netdevice_notifier(&macvlan_notifier_block);
1647         return err;
1648 }
1649
1650 static void __exit macvlan_cleanup_module(void)
1651 {
1652         rtnl_link_unregister(&macvlan_link_ops);
1653         unregister_netdevice_notifier(&macvlan_notifier_block);
1654 }
1655
1656 module_init(macvlan_init_module);
1657 module_exit(macvlan_cleanup_module);
1658
1659 MODULE_LICENSE("GPL");
1660 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1661 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1662 MODULE_ALIAS_RTNL_LINK("macvlan");