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 #define MACVLAN_F_PASSTHRU      1
  43 #define MACVLAN_F_ADDRCHANGE    2
  44
  45 struct macvlan_port {
  46         struct net_device       *dev;
  47         struct hlist_head       vlan_hash[MACVLAN_HASH_SIZE];
  48         struct list_head        vlans;
  49         struct sk_buff_head     bc_queue;
  50         struct work_struct      bc_work;
  51         u32                     flags;
  52         int                     count;
  53         struct hlist_head       vlan_source_hash[MACVLAN_HASH_SIZE];
  54         DECLARE_BITMAP(mc_filter, MACVLAN_MC_FILTER_SZ);
  55         unsigned char           perm_addr[ETH_ALEN];
  56 };
  57
  58 struct macvlan_source_entry {
  59         struct hlist_node       hlist;
  60         struct macvlan_dev      *vlan;
  61         unsigned char           addr[6+2] __aligned(sizeof(u16));
  62         struct rcu_head         rcu;
  63 };
  64
  65 struct macvlan_skb_cb {
  66         const struct macvlan_dev *src;
  67 };
  68
  69 #define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0]))
  70
  71 static void macvlan_port_destroy(struct net_device *dev);
  72
  73 static inline bool macvlan_passthru(const struct macvlan_port *port)
  74 {
  75         return port->flags & MACVLAN_F_PASSTHRU;
  76 }
  77
  78 static inline void macvlan_set_passthru(struct macvlan_port *port)
  79 {
  80         port->flags |= MACVLAN_F_PASSTHRU;
  81 }
  82
  83 static inline bool macvlan_addr_change(const struct macvlan_port *port)
  84 {
  85         return port->flags & MACVLAN_F_ADDRCHANGE;
  86 }
  87
  88 static inline void macvlan_set_addr_change(struct macvlan_port *port)
  89 {
  90         port->flags |= MACVLAN_F_ADDRCHANGE;
  91 }
  92
  93 static inline void macvlan_clear_addr_change(struct macvlan_port *port)
  94 {
  95         port->flags &= ~MACVLAN_F_ADDRCHANGE;
  96 }
  97
  98 /* Hash Ethernet address */
  99 static u32 macvlan_eth_hash(const unsigned char *addr)
 100 {
 101         u64 value = get_unaligned((u64 *)addr);
 102
 103         /* only want 6 bytes */
 104 #ifdef __BIG_ENDIAN
 105         value >>= 16;
 106 #else
 107         value <<= 16;
 108 #endif
 109         return hash_64(value, MACVLAN_HASH_BITS);
 110 }
 111
 112 static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev)
 113 {
 114         return rcu_dereference(dev->rx_handler_data);
 115 }
 116
 117 static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev)
 118 {
 119         return rtnl_dereference(dev->rx_handler_data);
 120 }
 121
 122 #define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT)
 123
 124 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
 125                                                const unsigned char *addr)
 126 {
 127         struct macvlan_dev *vlan;
 128         u32 idx = macvlan_eth_hash(addr);
 129
 130         hlist_for_each_entry_rcu(vlan, &port->vlan_hash[idx], hlist) {
 131                 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr))
 132                         return vlan;
 133         }
 134         return NULL;
 135 }
 136
 137 static struct macvlan_source_entry *macvlan_hash_lookup_source(
 138         const struct macvlan_dev *vlan,
 139         const unsigned char *addr)
 140 {
 141         struct macvlan_source_entry *entry;
 142         u32 idx = macvlan_eth_hash(addr);
 143         struct hlist_head *h = &vlan->port->vlan_source_hash[idx];
 144
 145         hlist_for_each_entry_rcu(entry, h, hlist) {
 146                 if (ether_addr_equal_64bits(entry->addr, addr) &&
 147                     entry->vlan == vlan)
 148                         return entry;
 149         }
 150         return NULL;
 151 }
 152
 153 static int macvlan_hash_add_source(struct macvlan_dev *vlan,
 154                                    const unsigned char *addr)
 155 {
 156         struct macvlan_port *port = vlan->port;
 157         struct macvlan_source_entry *entry;
 158         struct hlist_head *h;
 159
 160         entry = macvlan_hash_lookup_source(vlan, addr);
 161         if (entry)
 162                 return 0;
 163
 164         entry = kmalloc(sizeof(*entry), GFP_KERNEL);
 165         if (!entry)
 166                 return -ENOMEM;
 167
 168         ether_addr_copy(entry->addr, addr);
 169         entry->vlan = vlan;
 170         h = &port->vlan_source_hash[macvlan_eth_hash(addr)];
 171         hlist_add_head_rcu(&entry->hlist, h);
 172         vlan->macaddr_count++;
 173
 174         return 0;
 175 }
 176
 177 static void macvlan_hash_add(struct macvlan_dev *vlan)
 178 {
 179         struct macvlan_port *port = vlan->port;
 180         const unsigned char *addr = vlan->dev->dev_addr;
 181         u32 idx = macvlan_eth_hash(addr);
 182
 183         hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[idx]);
 184 }
 185
 186 static void macvlan_hash_del_source(struct macvlan_source_entry *entry)
 187 {
 188         hlist_del_rcu(&entry->hlist);
 189         kfree_rcu(entry, rcu);
 190 }
 191
 192 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
 193 {
 194         hlist_del_rcu(&vlan->hlist);
 195         if (sync)
 196                 synchronize_rcu();
 197 }
 198
 199 static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
 200                                         const unsigned char *addr)
 201 {
 202         macvlan_hash_del(vlan, true);
 203         /* Now that we are unhashed it is safe to change the device
 204          * address without confusing packet delivery.
 205          */
 206         memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
 207         macvlan_hash_add(vlan);
 208 }
 209
 210 static bool macvlan_addr_busy(const struct macvlan_port *port,
 211                               const unsigned char *addr)
 212 {
 213         /* Test to see if the specified address is
 214          * currently in use by the underlying device or
 215          * another macvlan.
 216          */
 217         if (!macvlan_passthru(port) && !macvlan_addr_change(port) &&
 218             ether_addr_equal_64bits(port->dev->dev_addr, addr))
 219                 return true;
 220
 221         if (macvlan_hash_lookup(port, addr))
 222                 return true;
 223
 224         return false;
 225 }
 226
 227
 228 static int macvlan_broadcast_one(struct sk_buff *skb,
 229                                  const struct macvlan_dev *vlan,
 230                                  const struct ethhdr *eth, bool local)
 231 {
 232         struct net_device *dev = vlan->dev;
 233
 234         if (local)
 235                 return __dev_forward_skb(dev, skb);
 236
 237         skb->dev = dev;
 238         if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
 239                 skb->pkt_type = PACKET_BROADCAST;
 240         else
 241                 skb->pkt_type = PACKET_MULTICAST;
 242
 243         return 0;
 244 }
 245
 246 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
 247 {
 248         return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT);
 249 }
 250
 251
 252 static unsigned int mc_hash(const struct macvlan_dev *vlan,
 253                             const unsigned char *addr)
 254 {
 255         u32 val = __get_unaligned_cpu32(addr + 2);
 256
 257         val ^= macvlan_hash_mix(vlan);
 258         return hash_32(val, MACVLAN_MC_FILTER_BITS);
 259 }
 260
 261 static void macvlan_broadcast(struct sk_buff *skb,
 262                               const struct macvlan_port *port,
 263                               struct net_device *src,
 264                               enum macvlan_mode mode)
 265 {
 266         const struct ethhdr *eth = eth_hdr(skb);
 267         const struct macvlan_dev *vlan;
 268         struct sk_buff *nskb;
 269         unsigned int i;
 270         int err;
 271         unsigned int hash;
 272
 273         if (skb->protocol == htons(ETH_P_PAUSE))
 274                 return;
 275
 276         for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
 277                 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) {
 278                         if (vlan->dev == src || !(vlan->mode & mode))
 279                                 continue;
 280
 281                         hash = mc_hash(vlan, eth->h_dest);
 282                         if (!test_bit(hash, vlan->mc_filter))
 283                                 continue;
 284
 285                         err = NET_RX_DROP;
 286                         nskb = skb_clone(skb, GFP_ATOMIC);
 287                         if (likely(nskb))
 288                                 err = macvlan_broadcast_one(
 289                                         nskb, vlan, eth,
 290                                         mode == MACVLAN_MODE_BRIDGE) ?:
 291                                       netif_rx_ni(nskb);
 292                         macvlan_count_rx(vlan, skb->len + ETH_HLEN,
 293                                          err == NET_RX_SUCCESS, true);
 294                 }
 295         }
 296 }
 297
 298 static void macvlan_process_broadcast(struct work_struct *w)
 299 {
 300         struct macvlan_port *port = container_of(w, struct macvlan_port,
 301                                                  bc_work);
 302         struct sk_buff *skb;
 303         struct sk_buff_head list;
 304
 305         __skb_queue_head_init(&list);
 306
 307         spin_lock_bh(&port->bc_queue.lock);
 308         skb_queue_splice_tail_init(&port->bc_queue, &list);
 309         spin_unlock_bh(&port->bc_queue.lock);
 310
 311         while ((skb = __skb_dequeue(&list))) {
 312                 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
 313
 314                 rcu_read_lock();
 315
 316                 if (!src)
 317                         /* frame comes from an external address */
 318                         macvlan_broadcast(skb, port, NULL,
 319                                           MACVLAN_MODE_PRIVATE |
 320                                           MACVLAN_MODE_VEPA    |
 321                                           MACVLAN_MODE_PASSTHRU|
 322                                           MACVLAN_MODE_BRIDGE);
 323                 else if (src->mode == MACVLAN_MODE_VEPA)
 324                         /* flood to everyone except source */
 325                         macvlan_broadcast(skb, port, src->dev,
 326                                           MACVLAN_MODE_VEPA |
 327                                           MACVLAN_MODE_BRIDGE);
 328                 else
 329                         /*
 330                          * flood only to VEPA ports, bridge ports
 331                          * already saw the frame on the way out.
 332                          */
 333                         macvlan_broadcast(skb, port, src->dev,
 334                                           MACVLAN_MODE_VEPA);
 335
 336                 rcu_read_unlock();
 337
 338                 if (src)
 339                         dev_put(src->dev);
 340                 consume_skb(skb);
 341         }
 342 }
 343
 344 static void macvlan_broadcast_enqueue(struct macvlan_port *port,
 345                                       const struct macvlan_dev *src,
 346                                       struct sk_buff *skb)
 347 {
 348         struct sk_buff *nskb;
 349         int err = -ENOMEM;
 350
 351         nskb = skb_clone(skb, GFP_ATOMIC);
 352         if (!nskb)
 353                 goto err;
 354
 355         MACVLAN_SKB_CB(nskb)->src = src;
 356
 357         spin_lock(&port->bc_queue.lock);
 358         if (skb_queue_len(&port->bc_queue) < MACVLAN_BC_QUEUE_LEN) {
 359                 if (src)
 360                         dev_hold(src->dev);
 361                 __skb_queue_tail(&port->bc_queue, nskb);
 362                 err = 0;
 363         }
 364         spin_unlock(&port->bc_queue.lock);
 365
 366         if (err)
 367                 goto free_nskb;
 368
 369         schedule_work(&port->bc_work);
 370         return;
 371
 372 free_nskb:
 373         kfree_skb(nskb);
 374 err:
 375         atomic_long_inc(&skb->dev->rx_dropped);
 376 }
 377
 378 static void macvlan_flush_sources(struct macvlan_port *port,
 379                                   struct macvlan_dev *vlan)
 380 {
 381         int i;
 382
 383         for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
 384                 struct hlist_node *h, *n;
 385
 386                 hlist_for_each_safe(h, n, &port->vlan_source_hash[i]) {
 387                         struct macvlan_source_entry *entry;
 388
 389                         entry = hlist_entry(h, struct macvlan_source_entry,
 390                                             hlist);
 391                         if (entry->vlan == vlan)
 392                                 macvlan_hash_del_source(entry);
 393                 }
 394         }
 395         vlan->macaddr_count = 0;
 396 }
 397
 398 static void macvlan_forward_source_one(struct sk_buff *skb,
 399                                        struct macvlan_dev *vlan)
 400 {
 401         struct sk_buff *nskb;
 402         struct net_device *dev;
 403         int len;
 404         int ret;
 405
 406         dev = vlan->dev;
 407         if (unlikely(!(dev->flags & IFF_UP)))
 408                 return;
 409
 410         nskb = skb_clone(skb, GFP_ATOMIC);
 411         if (!nskb)
 412                 return;
 413
 414         len = nskb->len + ETH_HLEN;
 415         nskb->dev = dev;
 416
 417         if (ether_addr_equal_64bits(eth_hdr(skb)->h_dest, dev->dev_addr))
 418                 nskb->pkt_type = PACKET_HOST;
 419
 420         ret = netif_rx(nskb);
 421         macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
 422 }
 423
 424 static void macvlan_forward_source(struct sk_buff *skb,
 425                                    struct macvlan_port *port,
 426                                    const unsigned char *addr)
 427 {
 428         struct macvlan_source_entry *entry;
 429         u32 idx = macvlan_eth_hash(addr);
 430         struct hlist_head *h = &port->vlan_source_hash[idx];
 431
 432         hlist_for_each_entry_rcu(entry, h, hlist) {
 433                 if (ether_addr_equal_64bits(entry->addr, addr))
 434                         macvlan_forward_source_one(skb, entry->vlan);
 435         }
 436 }
 437
 438 /* called under rcu_read_lock() from netif_receive_skb */
 439 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
 440 {
 441         struct macvlan_port *port;
 442         struct sk_buff *skb = *pskb;
 443         const struct ethhdr *eth = eth_hdr(skb);
 444         const struct macvlan_dev *vlan;
 445         const struct macvlan_dev *src;
 446         struct net_device *dev;
 447         unsigned int len = 0;
 448         int ret;
 449         rx_handler_result_t handle_res;
 450
 451         port = macvlan_port_get_rcu(skb->dev);
 452         if (is_multicast_ether_addr(eth->h_dest)) {
 453                 unsigned int hash;
 454
 455                 skb = ip_check_defrag(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN);
 456                 if (!skb)
 457                         return RX_HANDLER_CONSUMED;
 458                 *pskb = skb;
 459                 eth = eth_hdr(skb);
 460                 macvlan_forward_source(skb, port, eth->h_source);
 461                 src = macvlan_hash_lookup(port, eth->h_source);
 462                 if (src && src->mode != MACVLAN_MODE_VEPA &&
 463                     src->mode != MACVLAN_MODE_BRIDGE) {
 464                         /* forward to original port. */
 465                         vlan = src;
 466                         ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
 467                               netif_rx(skb);
 468                         handle_res = RX_HANDLER_CONSUMED;
 469                         goto out;
 470                 }
 471
 472                 hash = mc_hash(NULL, eth->h_dest);
 473                 if (test_bit(hash, port->mc_filter))
 474                         macvlan_broadcast_enqueue(port, src, skb);
 475
 476                 return RX_HANDLER_PASS;
 477         }
 478
 479         macvlan_forward_source(skb, port, eth->h_source);
 480         if (macvlan_passthru(port))
 481                 vlan = list_first_or_null_rcu(&port->vlans,
 482                                               struct macvlan_dev, list);
 483         else
 484                 vlan = macvlan_hash_lookup(port, eth->h_dest);
 485         if (!vlan || vlan->mode == MACVLAN_MODE_SOURCE)
 486                 return RX_HANDLER_PASS;
 487
 488         dev = vlan->dev;
 489         if (unlikely(!(dev->flags & IFF_UP))) {
 490                 kfree_skb(skb);
 491                 return RX_HANDLER_CONSUMED;
 492         }
 493         len = skb->len + ETH_HLEN;
 494         skb = skb_share_check(skb, GFP_ATOMIC);
 495         if (!skb) {
 496                 ret = NET_RX_DROP;
 497                 handle_res = RX_HANDLER_CONSUMED;
 498                 goto out;
 499         }
 500
 501         *pskb = skb;
 502         skb->dev = dev;
 503         skb->pkt_type = PACKET_HOST;
 504
 505         ret = NET_RX_SUCCESS;
 506         handle_res = RX_HANDLER_ANOTHER;
 507 out:
 508         macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
 509         return handle_res;
 510 }
 511
 512 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
 513 {
 514         const struct macvlan_dev *vlan = netdev_priv(dev);
 515         const struct macvlan_port *port = vlan->port;
 516         const struct macvlan_dev *dest;
 517
 518         if (vlan->mode == MACVLAN_MODE_BRIDGE) {
 519                 const struct ethhdr *eth = (void *)skb->data;
 520
 521                 /* send to other bridge ports directly */
 522                 if (is_multicast_ether_addr(eth->h_dest)) {
 523                         macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
 524                         goto xmit_world;
 525                 }
 526
 527                 dest = macvlan_hash_lookup(port, eth->h_dest);
 528                 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
 529                         /* send to lowerdev first for its network taps */
 530                         dev_forward_skb(vlan->lowerdev, skb);
 531
 532                         return NET_XMIT_SUCCESS;
 533                 }
 534         }
 535 xmit_world:
 536         skb->dev = vlan->lowerdev;
 537         return dev_queue_xmit_accel(skb,
 538                                     netdev_get_sb_channel(dev) ? dev : NULL);
 539 }
 540
 541 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
 542 {
 543 #ifdef CONFIG_NET_POLL_CONTROLLER
 544         if (vlan->netpoll)
 545                 netpoll_send_skb(vlan->netpoll, skb);
 546 #else
 547         BUG();
 548 #endif
 549         return NETDEV_TX_OK;
 550 }
 551
 552 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
 553                                       struct net_device *dev)
 554 {
 555         struct macvlan_dev *vlan = netdev_priv(dev);
 556         unsigned int len = skb->len;
 557         int ret;
 558
 559         if (unlikely(netpoll_tx_running(dev)))
 560                 return macvlan_netpoll_send_skb(vlan, skb);
 561
 562         ret = macvlan_queue_xmit(skb, dev);
 563
 564         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 565                 struct vlan_pcpu_stats *pcpu_stats;
 566
 567                 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
 568                 u64_stats_update_begin(&pcpu_stats->syncp);
 569                 pcpu_stats->tx_packets++;
 570                 pcpu_stats->tx_bytes += len;
 571                 u64_stats_update_end(&pcpu_stats->syncp);
 572         } else {
 573                 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
 574         }
 575         return ret;
 576 }
 577
 578 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
 579                                unsigned short type, const void *daddr,
 580                                const void *saddr, unsigned len)
 581 {
 582         const struct macvlan_dev *vlan = netdev_priv(dev);
 583         struct net_device *lowerdev = vlan->lowerdev;
 584
 585         return dev_hard_header(skb, lowerdev, type, daddr,
 586                                saddr ? : dev->dev_addr, len);
 587 }
 588
 589 static const struct header_ops macvlan_hard_header_ops = {
 590         .create         = macvlan_hard_header,
 591         .parse          = eth_header_parse,
 592         .cache          = eth_header_cache,
 593         .cache_update   = eth_header_cache_update,
 594 };
 595
 596 static int macvlan_open(struct net_device *dev)
 597 {
 598         struct macvlan_dev *vlan = netdev_priv(dev);
 599         struct net_device *lowerdev = vlan->lowerdev;
 600         int err;
 601
 602         if (macvlan_passthru(vlan->port)) {
 603                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
 604                         err = dev_set_promiscuity(lowerdev, 1);
 605                         if (err < 0)
 606                                 goto out;
 607                 }
 608                 goto hash_add;
 609         }
 610
 611         err = -EADDRINUSE;
 612         if (macvlan_addr_busy(vlan->port, dev->dev_addr))
 613                 goto out;
 614
 615         /* Attempt to populate accel_priv which is used to offload the L2
 616          * forwarding requests for unicast packets.
 617          */
 618         if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD)
 619                 vlan->accel_priv =
 620                       lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
 621
 622         /* If earlier attempt to offload failed, or accel_priv is not
 623          * populated we must add the unicast address to the lower device.
 624          */
 625         if (IS_ERR_OR_NULL(vlan->accel_priv)) {
 626                 vlan->accel_priv = NULL;
 627                 err = dev_uc_add(lowerdev, dev->dev_addr);
 628                 if (err < 0)
 629                         goto out;
 630         }
 631
 632         if (dev->flags & IFF_ALLMULTI) {
 633                 err = dev_set_allmulti(lowerdev, 1);
 634                 if (err < 0)
 635                         goto del_unicast;
 636         }
 637
 638         if (dev->flags & IFF_PROMISC) {
 639                 err = dev_set_promiscuity(lowerdev, 1);
 640                 if (err < 0)
 641                         goto clear_multi;
 642         }
 643
 644 hash_add:
 645         macvlan_hash_add(vlan);
 646         return 0;
 647
 648 clear_multi:
 649         if (dev->flags & IFF_ALLMULTI)
 650                 dev_set_allmulti(lowerdev, -1);
 651 del_unicast:
 652         if (vlan->accel_priv) {
 653                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
 654                                                            vlan->accel_priv);
 655                 vlan->accel_priv = NULL;
 656         } else {
 657                 dev_uc_del(lowerdev, dev->dev_addr);
 658         }
 659 out:
 660         return err;
 661 }
 662
 663 static int macvlan_stop(struct net_device *dev)
 664 {
 665         struct macvlan_dev *vlan = netdev_priv(dev);
 666         struct net_device *lowerdev = vlan->lowerdev;
 667
 668         if (vlan->accel_priv) {
 669                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
 670                                                            vlan->accel_priv);
 671                 vlan->accel_priv = NULL;
 672         }
 673
 674         dev_uc_unsync(lowerdev, dev);
 675         dev_mc_unsync(lowerdev, dev);
 676
 677         if (macvlan_passthru(vlan->port)) {
 678                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
 679                         dev_set_promiscuity(lowerdev, -1);
 680                 goto hash_del;
 681         }
 682
 683         if (dev->flags & IFF_ALLMULTI)
 684                 dev_set_allmulti(lowerdev, -1);
 685
 686         if (dev->flags & IFF_PROMISC)
 687                 dev_set_promiscuity(lowerdev, -1);
 688
 689         dev_uc_del(lowerdev, dev->dev_addr);
 690
 691 hash_del:
 692         macvlan_hash_del(vlan, !dev->dismantle);
 693         return 0;
 694 }
 695
 696 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
 697 {
 698         struct macvlan_dev *vlan = netdev_priv(dev);
 699         struct net_device *lowerdev = vlan->lowerdev;
 700         struct macvlan_port *port = vlan->port;
 701         int err;
 702
 703         if (!(dev->flags & IFF_UP)) {
 704                 /* Just copy in the new address */
 705                 ether_addr_copy(dev->dev_addr, addr);
 706         } else {
 707                 /* Rehash and update the device filters */
 708                 if (macvlan_addr_busy(vlan->port, addr))
 709                         return -EADDRINUSE;
 710
 711                 if (!macvlan_passthru(port)) {
 712                         err = dev_uc_add(lowerdev, addr);
 713                         if (err)
 714                                 return err;
 715
 716                         dev_uc_del(lowerdev, dev->dev_addr);
 717                 }
 718
 719                 macvlan_hash_change_addr(vlan, addr);
 720         }
 721         if (macvlan_passthru(port) && !macvlan_addr_change(port)) {
 722                 /* Since addr_change isn't set, we are here due to lower
 723                  * device change.  Save the lower-dev address so we can
 724                  * restore it later.
 725                  */
 726                 ether_addr_copy(vlan->port->perm_addr,
 727                                 lowerdev->dev_addr);
 728         }
 729         macvlan_clear_addr_change(port);
 730         return 0;
 731 }
 732
 733 static int macvlan_set_mac_address(struct net_device *dev, void *p)
 734 {
 735         struct macvlan_dev *vlan = netdev_priv(dev);
 736         struct sockaddr *addr = p;
 737
 738         if (!is_valid_ether_addr(addr->sa_data))
 739                 return -EADDRNOTAVAIL;
 740
 741         /* If the addresses are the same, this is a no-op */
 742         if (ether_addr_equal(dev->dev_addr, addr->sa_data))
 743                 return 0;
 744
 745         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
 746                 macvlan_set_addr_change(vlan->port);
 747                 return dev_set_mac_address(vlan->lowerdev, addr, NULL);
 748         }
 749
 750         if (macvlan_addr_busy(vlan->port, addr->sa_data))
 751                 return -EADDRINUSE;
 752
 753         return macvlan_sync_address(dev, addr->sa_data);
 754 }
 755
 756 static void macvlan_change_rx_flags(struct net_device *dev, int change)
 757 {
 758         struct macvlan_dev *vlan = netdev_priv(dev);
 759         struct net_device *lowerdev = vlan->lowerdev;
 760
 761         if (dev->flags & IFF_UP) {
 762                 if (change & IFF_ALLMULTI)
 763                         dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 764                 if (change & IFF_PROMISC)
 765                         dev_set_promiscuity(lowerdev,
 766                                             dev->flags & IFF_PROMISC ? 1 : -1);
 767
 768         }
 769 }
 770
 771 static void macvlan_compute_filter(unsigned long *mc_filter,
 772                                    struct net_device *dev,
 773                                    struct macvlan_dev *vlan)
 774 {
 775         if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
 776                 bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ);
 777         } else {
 778                 struct netdev_hw_addr *ha;
 779                 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
 780
 781                 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
 782                 netdev_for_each_mc_addr(ha, dev) {
 783                         __set_bit(mc_hash(vlan, ha->addr), filter);
 784                 }
 785
 786                 __set_bit(mc_hash(vlan, dev->broadcast), filter);
 787
 788                 bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ);
 789         }
 790 }
 791
 792 static void macvlan_set_mac_lists(struct net_device *dev)
 793 {
 794         struct macvlan_dev *vlan = netdev_priv(dev);
 795
 796         macvlan_compute_filter(vlan->mc_filter, dev, vlan);
 797
 798         dev_uc_sync(vlan->lowerdev, dev);
 799         dev_mc_sync(vlan->lowerdev, dev);
 800
 801         /* This is slightly inaccurate as we're including the subscription
 802          * list of vlan->lowerdev too.
 803          *
 804          * Bug alert: This only works if everyone has the same broadcast
 805          * address as lowerdev.  As soon as someone changes theirs this
 806          * will break.
 807          *
 808          * However, this is already broken as when you change your broadcast
 809          * address we don't get called.
 810          *
 811          * The solution is to maintain a list of broadcast addresses like
 812          * we do for uc/mc, if you care.
 813          */
 814         macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL);
 815 }
 816
 817 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
 818 {
 819         struct macvlan_dev *vlan = netdev_priv(dev);
 820
 821         if (vlan->lowerdev->mtu < new_mtu)
 822                 return -EINVAL;
 823         dev->mtu = new_mtu;
 824         return 0;
 825 }
 826
 827 /*
 828  * macvlan network devices have devices nesting below it and are a special
 829  * "super class" of normal network devices; split their locks off into a
 830  * separate class since they always nest.
 831  */
 832 static struct lock_class_key macvlan_netdev_addr_lock_key;
 833
 834 #define ALWAYS_ON_OFFLOADS \
 835         (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | \
 836          NETIF_F_GSO_ROBUST | NETIF_F_GSO_ENCAP_ALL)
 837
 838 #define ALWAYS_ON_FEATURES (ALWAYS_ON_OFFLOADS | NETIF_F_LLTX)
 839
 840 #define MACVLAN_FEATURES \
 841         (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
 842          NETIF_F_GSO | NETIF_F_TSO | NETIF_F_LRO | \
 843          NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
 844          NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
 845
 846 #define MACVLAN_STATE_MASK \
 847         ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
 848
 849 static int macvlan_get_nest_level(struct net_device *dev)
 850 {
 851         return ((struct macvlan_dev *)netdev_priv(dev))->nest_level;
 852 }
 853
 854 static void macvlan_set_lockdep_class(struct net_device *dev)
 855 {
 856         netdev_lockdep_set_classes(dev);
 857         lockdep_set_class_and_subclass(&dev->addr_list_lock,
 858                                        &macvlan_netdev_addr_lock_key,
 859                                        macvlan_get_nest_level(dev));
 860 }
 861
 862 static int macvlan_init(struct net_device *dev)
 863 {
 864         struct macvlan_dev *vlan = netdev_priv(dev);
 865         const struct net_device *lowerdev = vlan->lowerdev;
 866         struct macvlan_port *port = vlan->port;
 867
 868         dev->state              = (dev->state & ~MACVLAN_STATE_MASK) |
 869                                   (lowerdev->state & MACVLAN_STATE_MASK);
 870         dev->features           = lowerdev->features & MACVLAN_FEATURES;
 871         dev->features           |= ALWAYS_ON_FEATURES;
 872         dev->hw_features        |= NETIF_F_LRO;
 873         dev->vlan_features      = lowerdev->vlan_features & MACVLAN_FEATURES;
 874         dev->vlan_features      |= ALWAYS_ON_OFFLOADS;
 875         dev->hw_enc_features    |= dev->features;
 876         dev->gso_max_size       = lowerdev->gso_max_size;
 877         dev->gso_max_segs       = lowerdev->gso_max_segs;
 878         dev->hard_header_len    = lowerdev->hard_header_len;
 879
 880         macvlan_set_lockdep_class(dev);
 881
 882         vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
 883         if (!vlan->pcpu_stats)
 884                 return -ENOMEM;
 885
 886         port->count += 1;
 887
 888         return 0;
 889 }
 890
 891 static void macvlan_uninit(struct net_device *dev)
 892 {
 893         struct macvlan_dev *vlan = netdev_priv(dev);
 894         struct macvlan_port *port = vlan->port;
 895
 896         free_percpu(vlan->pcpu_stats);
 897
 898         macvlan_flush_sources(port, vlan);
 899         port->count -= 1;
 900         if (!port->count)
 901                 macvlan_port_destroy(port->dev);
 902 }
 903
 904 static void macvlan_dev_get_stats64(struct net_device *dev,
 905                                     struct rtnl_link_stats64 *stats)
 906 {
 907         struct macvlan_dev *vlan = netdev_priv(dev);
 908
 909         if (vlan->pcpu_stats) {
 910                 struct vlan_pcpu_stats *p;
 911                 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
 912                 u32 rx_errors = 0, tx_dropped = 0;
 913                 unsigned int start;
 914                 int i;
 915
 916                 for_each_possible_cpu(i) {
 917                         p = per_cpu_ptr(vlan->pcpu_stats, i);
 918                         do {
 919                                 start = u64_stats_fetch_begin_irq(&p->syncp);
 920                                 rx_packets      = p->rx_packets;
 921                                 rx_bytes        = p->rx_bytes;
 922                                 rx_multicast    = p->rx_multicast;
 923                                 tx_packets      = p->tx_packets;
 924                                 tx_bytes        = p->tx_bytes;
 925                         } while (u64_stats_fetch_retry_irq(&p->syncp, start));
 926
 927                         stats->rx_packets       += rx_packets;
 928                         stats->rx_bytes         += rx_bytes;
 929                         stats->multicast        += rx_multicast;
 930                         stats->tx_packets       += tx_packets;
 931                         stats->tx_bytes         += tx_bytes;
 932                         /* rx_errors & tx_dropped are u32, updated
 933                          * without syncp protection.
 934                          */
 935                         rx_errors       += p->rx_errors;
 936                         tx_dropped      += p->tx_dropped;
 937                 }
 938                 stats->rx_errors        = rx_errors;
 939                 stats->rx_dropped       = rx_errors;
 940                 stats->tx_dropped       = tx_dropped;
 941         }
 942 }
 943
 944 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
 945                                    __be16 proto, u16 vid)
 946 {
 947         struct macvlan_dev *vlan = netdev_priv(dev);
 948         struct net_device *lowerdev = vlan->lowerdev;
 949
 950         return vlan_vid_add(lowerdev, proto, vid);
 951 }
 952
 953 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
 954                                     __be16 proto, u16 vid)
 955 {
 956         struct macvlan_dev *vlan = netdev_priv(dev);
 957         struct net_device *lowerdev = vlan->lowerdev;
 958
 959         vlan_vid_del(lowerdev, proto, vid);
 960         return 0;
 961 }
 962
 963 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 964                            struct net_device *dev,
 965                            const unsigned char *addr, u16 vid,
 966                            u16 flags)
 967 {
 968         struct macvlan_dev *vlan = netdev_priv(dev);
 969         int err = -EINVAL;
 970
 971         /* Support unicast filter only on passthru devices.
 972          * Multicast filter should be allowed on all devices.
 973          */
 974         if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
 975                 return -EOPNOTSUPP;
 976
 977         if (flags & NLM_F_REPLACE)
 978                 return -EOPNOTSUPP;
 979
 980         if (is_unicast_ether_addr(addr))
 981                 err = dev_uc_add_excl(dev, addr);
 982         else if (is_multicast_ether_addr(addr))
 983                 err = dev_mc_add_excl(dev, addr);
 984
 985         return err;
 986 }
 987
 988 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
 989                            struct net_device *dev,
 990                            const unsigned char *addr, u16 vid)
 991 {
 992         struct macvlan_dev *vlan = netdev_priv(dev);
 993         int err = -EINVAL;
 994
 995         /* Support unicast filter only on passthru devices.
 996          * Multicast filter should be allowed on all devices.
 997          */
 998         if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
 999                 return -EOPNOTSUPP;
1000
1001         if (is_unicast_ether_addr(addr))
1002                 err = dev_uc_del(dev, addr);
1003         else if (is_multicast_ether_addr(addr))
1004                 err = dev_mc_del(dev, addr);
1005
1006         return err;
1007 }
1008
1009 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
1010                                         struct ethtool_drvinfo *drvinfo)
1011 {
1012         strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
1013         strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
1014 }
1015
1016 static int macvlan_ethtool_get_link_ksettings(struct net_device *dev,
1017                                               struct ethtool_link_ksettings *cmd)
1018 {
1019         const struct macvlan_dev *vlan = netdev_priv(dev);
1020
1021         return __ethtool_get_link_ksettings(vlan->lowerdev, cmd);
1022 }
1023
1024 static netdev_features_t macvlan_fix_features(struct net_device *dev,
1025                                               netdev_features_t features)
1026 {
1027         struct macvlan_dev *vlan = netdev_priv(dev);
1028         netdev_features_t lowerdev_features = vlan->lowerdev->features;
1029         netdev_features_t mask;
1030
1031         features |= NETIF_F_ALL_FOR_ALL;
1032         features &= (vlan->set_features | ~MACVLAN_FEATURES);
1033         mask = features;
1034
1035         lowerdev_features &= (features | ~NETIF_F_LRO);
1036         features = netdev_increment_features(lowerdev_features, features, mask);
1037         features |= ALWAYS_ON_FEATURES;
1038         features &= (ALWAYS_ON_FEATURES | MACVLAN_FEATURES);
1039
1040         return features;
1041 }
1042
1043 #ifdef CONFIG_NET_POLL_CONTROLLER
1044 static void macvlan_dev_poll_controller(struct net_device *dev)
1045 {
1046         return;
1047 }
1048
1049 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
1050 {
1051         struct macvlan_dev *vlan = netdev_priv(dev);
1052         struct net_device *real_dev = vlan->lowerdev;
1053         struct netpoll *netpoll;
1054         int err = 0;
1055
1056         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
1057         err = -ENOMEM;
1058         if (!netpoll)
1059                 goto out;
1060
1061         err = __netpoll_setup(netpoll, real_dev);
1062         if (err) {
1063                 kfree(netpoll);
1064                 goto out;
1065         }
1066
1067         vlan->netpoll = netpoll;
1068
1069 out:
1070         return err;
1071 }
1072
1073 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
1074 {
1075         struct macvlan_dev *vlan = netdev_priv(dev);
1076         struct netpoll *netpoll = vlan->netpoll;
1077
1078         if (!netpoll)
1079                 return;
1080
1081         vlan->netpoll = NULL;
1082
1083         __netpoll_free(netpoll);
1084 }
1085 #endif  /* CONFIG_NET_POLL_CONTROLLER */
1086
1087 static int macvlan_dev_get_iflink(const struct net_device *dev)
1088 {
1089         struct macvlan_dev *vlan = netdev_priv(dev);
1090
1091         return vlan->lowerdev->ifindex;
1092 }
1093
1094 static const struct ethtool_ops macvlan_ethtool_ops = {
1095         .get_link               = ethtool_op_get_link,
1096         .get_link_ksettings     = macvlan_ethtool_get_link_ksettings,
1097         .get_drvinfo            = macvlan_ethtool_get_drvinfo,
1098 };
1099
1100 static const struct net_device_ops macvlan_netdev_ops = {
1101         .ndo_init               = macvlan_init,
1102         .ndo_uninit             = macvlan_uninit,
1103         .ndo_open               = macvlan_open,
1104         .ndo_stop               = macvlan_stop,
1105         .ndo_start_xmit         = macvlan_start_xmit,
1106         .ndo_change_mtu         = macvlan_change_mtu,
1107         .ndo_fix_features       = macvlan_fix_features,
1108         .ndo_change_rx_flags    = macvlan_change_rx_flags,
1109         .ndo_set_mac_address    = macvlan_set_mac_address,
1110         .ndo_set_rx_mode        = macvlan_set_mac_lists,
1111         .ndo_get_stats64        = macvlan_dev_get_stats64,
1112         .ndo_validate_addr      = eth_validate_addr,
1113         .ndo_vlan_rx_add_vid    = macvlan_vlan_rx_add_vid,
1114         .ndo_vlan_rx_kill_vid   = macvlan_vlan_rx_kill_vid,
1115         .ndo_fdb_add            = macvlan_fdb_add,
1116         .ndo_fdb_del            = macvlan_fdb_del,
1117         .ndo_fdb_dump           = ndo_dflt_fdb_dump,
1118         .ndo_get_lock_subclass  = macvlan_get_nest_level,
1119 #ifdef CONFIG_NET_POLL_CONTROLLER
1120         .ndo_poll_controller    = macvlan_dev_poll_controller,
1121         .ndo_netpoll_setup      = macvlan_dev_netpoll_setup,
1122         .ndo_netpoll_cleanup    = macvlan_dev_netpoll_cleanup,
1123 #endif
1124         .ndo_get_iflink         = macvlan_dev_get_iflink,
1125         .ndo_features_check     = passthru_features_check,
1126 };
1127
1128 void macvlan_common_setup(struct net_device *dev)
1129 {
1130         ether_setup(dev);
1131
1132         dev->min_mtu            = 0;
1133         dev->max_mtu            = ETH_MAX_MTU;
1134         dev->priv_flags        &= ~IFF_TX_SKB_SHARING;
1135         netif_keep_dst(dev);
1136         dev->priv_flags        |= IFF_UNICAST_FLT;
1137         dev->netdev_ops         = &macvlan_netdev_ops;
1138         dev->needs_free_netdev  = true;
1139         dev->header_ops         = &macvlan_hard_header_ops;
1140         dev->ethtool_ops        = &macvlan_ethtool_ops;
1141 }
1142 EXPORT_SYMBOL_GPL(macvlan_common_setup);
1143
1144 static void macvlan_setup(struct net_device *dev)
1145 {
1146         macvlan_common_setup(dev);
1147         dev->priv_flags |= IFF_NO_QUEUE;
1148 }
1149
1150 static int macvlan_port_create(struct net_device *dev)
1151 {
1152         struct macvlan_port *port;
1153         unsigned int i;
1154         int err;
1155
1156         if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1157                 return -EINVAL;
1158
1159         if (netdev_is_rx_handler_busy(dev))
1160                 return -EBUSY;
1161
1162         port = kzalloc(sizeof(*port), GFP_KERNEL);
1163         if (port == NULL)
1164                 return -ENOMEM;
1165
1166         port->dev = dev;
1167         ether_addr_copy(port->perm_addr, dev->dev_addr);
1168         INIT_LIST_HEAD(&port->vlans);
1169         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1170                 INIT_HLIST_HEAD(&port->vlan_hash[i]);
1171         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1172                 INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1173
1174         skb_queue_head_init(&port->bc_queue);
1175         INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1176
1177         err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1178         if (err)
1179                 kfree(port);
1180         else
1181                 dev->priv_flags |= IFF_MACVLAN_PORT;
1182         return err;
1183 }
1184
1185 static void macvlan_port_destroy(struct net_device *dev)
1186 {
1187         struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1188         struct sk_buff *skb;
1189
1190         dev->priv_flags &= ~IFF_MACVLAN_PORT;
1191         netdev_rx_handler_unregister(dev);
1192
1193         /* After this point, no packet can schedule bc_work anymore,
1194          * but we need to cancel it and purge left skbs if any.
1195          */
1196         cancel_work_sync(&port->bc_work);
1197
1198         while ((skb = __skb_dequeue(&port->bc_queue))) {
1199                 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
1200
1201                 if (src)
1202                         dev_put(src->dev);
1203
1204                 kfree_skb(skb);
1205         }
1206
1207         /* If the lower device address has been changed by passthru
1208          * macvlan, put it back.
1209          */
1210         if (macvlan_passthru(port) &&
1211             !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) {
1212                 struct sockaddr sa;
1213
1214                 sa.sa_family = port->dev->type;
1215                 memcpy(&sa.sa_data, port->perm_addr, port->dev->addr_len);
1216                 dev_set_mac_address(port->dev, &sa, NULL);
1217         }
1218
1219         kfree(port);
1220 }
1221
1222 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[],
1223                             struct netlink_ext_ack *extack)
1224 {
1225         if (tb[IFLA_ADDRESS]) {
1226                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1227                         return -EINVAL;
1228                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1229                         return -EADDRNOTAVAIL;
1230         }
1231
1232         if (!data)
1233                 return 0;
1234
1235         if (data[IFLA_MACVLAN_FLAGS] &&
1236             nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
1237                 return -EINVAL;
1238
1239         if (data[IFLA_MACVLAN_MODE]) {
1240                 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1241                 case MACVLAN_MODE_PRIVATE:
1242                 case MACVLAN_MODE_VEPA:
1243                 case MACVLAN_MODE_BRIDGE:
1244                 case MACVLAN_MODE_PASSTHRU:
1245                 case MACVLAN_MODE_SOURCE:
1246                         break;
1247                 default:
1248                         return -EINVAL;
1249                 }
1250         }
1251
1252         if (data[IFLA_MACVLAN_MACADDR_MODE]) {
1253                 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1254                 case MACVLAN_MACADDR_ADD:
1255                 case MACVLAN_MACADDR_DEL:
1256                 case MACVLAN_MACADDR_FLUSH:
1257                 case MACVLAN_MACADDR_SET:
1258                         break;
1259                 default:
1260                         return -EINVAL;
1261                 }
1262         }
1263
1264         if (data[IFLA_MACVLAN_MACADDR]) {
1265                 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1266                         return -EINVAL;
1267
1268                 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1269                         return -EADDRNOTAVAIL;
1270         }
1271
1272         if (data[IFLA_MACVLAN_MACADDR_COUNT])
1273                 return -EINVAL;
1274
1275         return 0;
1276 }
1277
1278 /**
1279  * reconfigure list of remote source mac address
1280  * (only for macvlan devices in source mode)
1281  * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1282  * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1283  */
1284 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1285                                       struct nlattr *data[])
1286 {
1287         char *addr = NULL;
1288         int ret, rem, len;
1289         struct nlattr *nla, *head;
1290         struct macvlan_source_entry *entry;
1291
1292         if (data[IFLA_MACVLAN_MACADDR])
1293                 addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1294
1295         if (mode == MACVLAN_MACADDR_ADD) {
1296                 if (!addr)
1297                         return -EINVAL;
1298
1299                 return macvlan_hash_add_source(vlan, addr);
1300
1301         } else if (mode == MACVLAN_MACADDR_DEL) {
1302                 if (!addr)
1303                         return -EINVAL;
1304
1305                 entry = macvlan_hash_lookup_source(vlan, addr);
1306                 if (entry) {
1307                         macvlan_hash_del_source(entry);
1308                         vlan->macaddr_count--;
1309                 }
1310         } else if (mode == MACVLAN_MACADDR_FLUSH) {
1311                 macvlan_flush_sources(vlan->port, vlan);
1312         } else if (mode == MACVLAN_MACADDR_SET) {
1313                 macvlan_flush_sources(vlan->port, vlan);
1314
1315                 if (addr) {
1316                         ret = macvlan_hash_add_source(vlan, addr);
1317                         if (ret)
1318                                 return ret;
1319                 }
1320
1321                 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA])
1322                         return 0;
1323
1324                 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1325                 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1326
1327                 nla_for_each_attr(nla, head, len, rem) {
1328                         if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1329                             nla_len(nla) != ETH_ALEN)
1330                                 continue;
1331
1332                         addr = nla_data(nla);
1333                         ret = macvlan_hash_add_source(vlan, addr);
1334                         if (ret)
1335                                 return ret;
1336                 }
1337         } else {
1338                 return -EINVAL;
1339         }
1340
1341         return 0;
1342 }
1343
1344 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1345                            struct nlattr *tb[], struct nlattr *data[],
1346                            struct netlink_ext_ack *extack)
1347 {
1348         struct macvlan_dev *vlan = netdev_priv(dev);
1349         struct macvlan_port *port;
1350         struct net_device *lowerdev;
1351         int err;
1352         int macmode;
1353         bool create = false;
1354
1355         if (!tb[IFLA_LINK])
1356                 return -EINVAL;
1357
1358         lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1359         if (lowerdev == NULL)
1360                 return -ENODEV;
1361
1362         /* When creating macvlans or macvtaps on top of other macvlans - use
1363          * the real device as the lowerdev.
1364          */
1365         if (netif_is_macvlan(lowerdev))
1366                 lowerdev = macvlan_dev_real_dev(lowerdev);
1367
1368         if (!tb[IFLA_MTU])
1369                 dev->mtu = lowerdev->mtu;
1370         else if (dev->mtu > lowerdev->mtu)
1371                 return -EINVAL;
1372
1373         /* MTU range: 68 - lowerdev->max_mtu */
1374         dev->min_mtu = ETH_MIN_MTU;
1375         dev->max_mtu = lowerdev->max_mtu;
1376
1377         if (!tb[IFLA_ADDRESS])
1378                 eth_hw_addr_random(dev);
1379
1380         if (!macvlan_port_exists(lowerdev)) {
1381                 err = macvlan_port_create(lowerdev);
1382                 if (err < 0)
1383                         return err;
1384                 create = true;
1385         }
1386         port = macvlan_port_get_rtnl(lowerdev);
1387
1388         /* Only 1 macvlan device can be created in passthru mode */
1389         if (macvlan_passthru(port)) {
1390                 /* The macvlan port must be not created this time,
1391                  * still goto destroy_macvlan_port for readability.
1392                  */
1393                 err = -EINVAL;
1394                 goto destroy_macvlan_port;
1395         }
1396
1397         vlan->lowerdev = lowerdev;
1398         vlan->dev      = dev;
1399         vlan->port     = port;
1400         vlan->set_features = MACVLAN_FEATURES;
1401         vlan->nest_level = dev_get_nest_level(lowerdev) + 1;
1402
1403         vlan->mode     = MACVLAN_MODE_VEPA;
1404         if (data && data[IFLA_MACVLAN_MODE])
1405                 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1406
1407         if (data && data[IFLA_MACVLAN_FLAGS])
1408                 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1409
1410         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1411                 if (port->count) {
1412                         err = -EINVAL;
1413                         goto destroy_macvlan_port;
1414                 }
1415                 macvlan_set_passthru(port);
1416                 eth_hw_addr_inherit(dev, lowerdev);
1417         }
1418
1419         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1420                 if (vlan->mode != MACVLAN_MODE_SOURCE) {
1421                         err = -EINVAL;
1422                         goto destroy_macvlan_port;
1423                 }
1424                 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1425                 err = macvlan_changelink_sources(vlan, macmode, data);
1426                 if (err)
1427                         goto destroy_macvlan_port;
1428         }
1429
1430         err = register_netdevice(dev);
1431         if (err < 0)
1432                 goto destroy_macvlan_port;
1433
1434         dev->priv_flags |= IFF_MACVLAN;
1435         err = netdev_upper_dev_link(lowerdev, dev, extack);
1436         if (err)
1437                 goto unregister_netdev;
1438
1439         list_add_tail_rcu(&vlan->list, &port->vlans);
1440         netif_stacked_transfer_operstate(lowerdev, dev);
1441         linkwatch_fire_event(dev);
1442
1443         return 0;
1444
1445 unregister_netdev:
1446         /* macvlan_uninit would free the macvlan port */
1447         unregister_netdevice(dev);
1448         return err;
1449 destroy_macvlan_port:
1450         /* the macvlan port may be freed by macvlan_uninit when fail to register.
1451          * so we destroy the macvlan port only when it's valid.
1452          */
1453         if (create && macvlan_port_get_rtnl(lowerdev))
1454                 macvlan_port_destroy(port->dev);
1455         return err;
1456 }
1457 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1458
1459 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1460                            struct nlattr *tb[], struct nlattr *data[],
1461                            struct netlink_ext_ack *extack)
1462 {
1463         return macvlan_common_newlink(src_net, dev, tb, data, extack);
1464 }
1465
1466 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1467 {
1468         struct macvlan_dev *vlan = netdev_priv(dev);
1469
1470         if (vlan->mode == MACVLAN_MODE_SOURCE)
1471                 macvlan_flush_sources(vlan->port, vlan);
1472         list_del_rcu(&vlan->list);
1473         unregister_netdevice_queue(dev, head);
1474         netdev_upper_dev_unlink(vlan->lowerdev, dev);
1475 }
1476 EXPORT_SYMBOL_GPL(macvlan_dellink);
1477
1478 static int macvlan_changelink(struct net_device *dev,
1479                               struct nlattr *tb[], struct nlattr *data[],
1480                               struct netlink_ext_ack *extack)
1481 {
1482         struct macvlan_dev *vlan = netdev_priv(dev);
1483         enum macvlan_mode mode;
1484         bool set_mode = false;
1485         enum macvlan_macaddr_mode macmode;
1486         int ret;
1487
1488         /* Validate mode, but don't set yet: setting flags may fail. */
1489         if (data && data[IFLA_MACVLAN_MODE]) {
1490                 set_mode = true;
1491                 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1492                 /* Passthrough mode can't be set or cleared dynamically */
1493                 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1494                     (vlan->mode == MACVLAN_MODE_PASSTHRU))
1495                         return -EINVAL;
1496                 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1497                     vlan->mode != mode)
1498                         macvlan_flush_sources(vlan->port, vlan);
1499         }
1500
1501         if (data && data[IFLA_MACVLAN_FLAGS]) {
1502                 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1503                 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1504                 if (macvlan_passthru(vlan->port) && promisc) {
1505                         int err;
1506
1507                         if (flags & MACVLAN_FLAG_NOPROMISC)
1508                                 err = dev_set_promiscuity(vlan->lowerdev, -1);
1509                         else
1510                                 err = dev_set_promiscuity(vlan->lowerdev, 1);
1511                         if (err < 0)
1512                                 return err;
1513                 }
1514                 vlan->flags = flags;
1515         }
1516         if (set_mode)
1517                 vlan->mode = mode;
1518         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1519                 if (vlan->mode != MACVLAN_MODE_SOURCE)
1520                         return -EINVAL;
1521                 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1522                 ret = macvlan_changelink_sources(vlan, macmode, data);
1523                 if (ret)
1524                         return ret;
1525         }
1526         return 0;
1527 }
1528
1529 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1530 {
1531         if (vlan->macaddr_count == 0)
1532                 return 0;
1533         return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1534                 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1535 }
1536
1537 static size_t macvlan_get_size(const struct net_device *dev)
1538 {
1539         struct macvlan_dev *vlan = netdev_priv(dev);
1540
1541         return (0
1542                 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1543                 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1544                 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1545                 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1546                 );
1547 }
1548
1549 static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1550                                      const struct macvlan_dev *vlan,
1551                                      const int i)
1552 {
1553         struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1554         struct macvlan_source_entry *entry;
1555
1556         hlist_for_each_entry_rcu(entry, h, hlist) {
1557                 if (entry->vlan != vlan)
1558                         continue;
1559                 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1560                         return 1;
1561         }
1562         return 0;
1563 }
1564
1565 static int macvlan_fill_info(struct sk_buff *skb,
1566                                 const struct net_device *dev)
1567 {
1568         struct macvlan_dev *vlan = netdev_priv(dev);
1569         int i;
1570         struct nlattr *nest;
1571
1572         if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1573                 goto nla_put_failure;
1574         if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1575                 goto nla_put_failure;
1576         if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1577                 goto nla_put_failure;
1578         if (vlan->macaddr_count > 0) {
1579                 nest = nla_nest_start(skb, IFLA_MACVLAN_MACADDR_DATA);
1580                 if (nest == NULL)
1581                         goto nla_put_failure;
1582
1583                 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1584                         if (macvlan_fill_info_macaddr(skb, vlan, i))
1585                                 goto nla_put_failure;
1586                 }
1587                 nla_nest_end(skb, nest);
1588         }
1589         return 0;
1590
1591 nla_put_failure:
1592         return -EMSGSIZE;
1593 }
1594
1595 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1596         [IFLA_MACVLAN_MODE]  = { .type = NLA_U32 },
1597         [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1598         [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1599         [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1600         [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1601         [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1602 };
1603
1604 int macvlan_link_register(struct rtnl_link_ops *ops)
1605 {
1606         /* common fields */
1607         ops->validate           = macvlan_validate;
1608         ops->maxtype            = IFLA_MACVLAN_MAX;
1609         ops->policy             = macvlan_policy;
1610         ops->changelink         = macvlan_changelink;
1611         ops->get_size           = macvlan_get_size;
1612         ops->fill_info          = macvlan_fill_info;
1613
1614         return rtnl_link_register(ops);
1615 };
1616 EXPORT_SYMBOL_GPL(macvlan_link_register);
1617
1618 static struct net *macvlan_get_link_net(const struct net_device *dev)
1619 {
1620         return dev_net(macvlan_dev_real_dev(dev));
1621 }
1622
1623 static struct rtnl_link_ops macvlan_link_ops = {
1624         .kind           = "macvlan",
1625         .setup          = macvlan_setup,
1626         .newlink        = macvlan_newlink,
1627         .dellink        = macvlan_dellink,
1628         .get_link_net   = macvlan_get_link_net,
1629         .priv_size      = sizeof(struct macvlan_dev),
1630 };
1631
1632 static int macvlan_device_event(struct notifier_block *unused,
1633                                 unsigned long event, void *ptr)
1634 {
1635         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1636         struct macvlan_dev *vlan, *next;
1637         struct macvlan_port *port;
1638         LIST_HEAD(list_kill);
1639
1640         if (!macvlan_port_exists(dev))
1641                 return NOTIFY_DONE;
1642
1643         port = macvlan_port_get_rtnl(dev);
1644
1645         switch (event) {
1646         case NETDEV_UP:
1647         case NETDEV_DOWN:
1648         case NETDEV_CHANGE:
1649                 list_for_each_entry(vlan, &port->vlans, list)
1650                         netif_stacked_transfer_operstate(vlan->lowerdev,
1651                                                          vlan->dev);
1652                 break;
1653         case NETDEV_FEAT_CHANGE:
1654                 list_for_each_entry(vlan, &port->vlans, list) {
1655                         vlan->dev->gso_max_size = dev->gso_max_size;
1656                         vlan->dev->gso_max_segs = dev->gso_max_segs;
1657                         netdev_update_features(vlan->dev);
1658                 }
1659                 break;
1660         case NETDEV_CHANGEMTU:
1661                 list_for_each_entry(vlan, &port->vlans, list) {
1662                         if (vlan->dev->mtu <= dev->mtu)
1663                                 continue;
1664                         dev_set_mtu(vlan->dev, dev->mtu);
1665                 }
1666                 break;
1667         case NETDEV_CHANGEADDR:
1668                 if (!macvlan_passthru(port))
1669                         return NOTIFY_DONE;
1670
1671                 vlan = list_first_entry_or_null(&port->vlans,
1672                                                 struct macvlan_dev,
1673                                                 list);
1674
1675                 if (macvlan_sync_address(vlan->dev, dev->dev_addr))
1676                         return NOTIFY_BAD;
1677
1678                 break;
1679         case NETDEV_UNREGISTER:
1680                 /* twiddle thumbs on netns device moves */
1681                 if (dev->reg_state != NETREG_UNREGISTERING)
1682                         break;
1683
1684                 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1685                         vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1686                 unregister_netdevice_many(&list_kill);
1687                 break;
1688         case NETDEV_PRE_TYPE_CHANGE:
1689                 /* Forbid underlaying device to change its type. */
1690                 return NOTIFY_BAD;
1691
1692         case NETDEV_NOTIFY_PEERS:
1693         case NETDEV_BONDING_FAILOVER:
1694         case NETDEV_RESEND_IGMP:
1695                 /* Propagate to all vlans */
1696                 list_for_each_entry(vlan, &port->vlans, list)
1697                         call_netdevice_notifiers(event, vlan->dev);
1698         }
1699         return NOTIFY_DONE;
1700 }
1701
1702 static struct notifier_block macvlan_notifier_block __read_mostly = {
1703         .notifier_call  = macvlan_device_event,
1704 };
1705
1706 static int __init macvlan_init_module(void)
1707 {
1708         int err;
1709
1710         register_netdevice_notifier(&macvlan_notifier_block);
1711
1712         err = macvlan_link_register(&macvlan_link_ops);
1713         if (err < 0)
1714                 goto err1;
1715         return 0;
1716 err1:
1717         unregister_netdevice_notifier(&macvlan_notifier_block);
1718         return err;
1719 }
1720
1721 static void __exit macvlan_cleanup_module(void)
1722 {
1723         rtnl_link_unregister(&macvlan_link_ops);
1724         unregister_netdevice_notifier(&macvlan_notifier_block);
1725 }
1726
1727 module_init(macvlan_init_module);
1728 module_exit(macvlan_cleanup_module);
1729
1730 MODULE_LICENSE("GPL");
1731 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1732 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1733 MODULE_ALIAS_RTNL_LINK("macvlan");