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