drivers/net/macvlan.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (c) 2007 Patrick McHardy <[email protected]>
   4  *
   5  * The code this is based on carried the following copyright notice:
   6  * ---
   7  * (C) Copyright 2001-2006
   8  * Alex Zeffertt, Cambridge Broadband Ltd, [email protected]
   9  * Re-worked by Ben Greear <[email protected]>
  10  * ---
  11  */
  12 #include <linux/kernel.h>
  13 #include <linux/types.h>
  14 #include <linux/module.h>
  15 #include <linux/init.h>
  16 #include <linux/errno.h>
  17 #include <linux/slab.h>
  18 #include <linux/string.h>
  19 #include <linux/rculist.h>
  20 #include <linux/notifier.h>
  21 #include <linux/netdevice.h>
  22 #include <linux/etherdevice.h>
  23 #include <linux/net_tstamp.h>
  24 #include <linux/ethtool.h>
  25 #include <linux/if_arp.h>
  26 #include <linux/if_vlan.h>
  27 #include <linux/if_link.h>
  28 #include <linux/if_macvlan.h>
  29 #include <linux/hash.h>
  30 #include <linux/workqueue.h>
  31 #include <net/rtnetlink.h>
  32 #include <net/xfrm.h>
  33 #include <linux/netpoll.h>
  34 #include <linux/phy.h>
  35
  36 #define MACVLAN_HASH_BITS       8
  37 #define MACVLAN_HASH_SIZE       (1<<MACVLAN_HASH_BITS)
  38 #define MACVLAN_BC_QUEUE_LEN    1000
  39
  40 #define MACVLAN_F_PASSTHRU      1
  41 #define MACVLAN_F_ADDRCHANGE    2
  42
  43 struct macvlan_port {
  44         struct net_device       *dev;
  45         struct hlist_head       vlan_hash[MACVLAN_HASH_SIZE];
  46         struct list_head        vlans;
  47         struct sk_buff_head     bc_queue;
  48         struct work_struct      bc_work;
  49         u32                     flags;
  50         int                     count;
  51         struct hlist_head       vlan_source_hash[MACVLAN_HASH_SIZE];
  52         DECLARE_BITMAP(mc_filter, MACVLAN_MC_FILTER_SZ);
  53         unsigned char           perm_addr[ETH_ALEN];
  54 };
  55
  56 struct macvlan_source_entry {
  57         struct hlist_node       hlist;
  58         struct macvlan_dev      *vlan;
  59         unsigned char           addr[6+2] __aligned(sizeof(u16));
  60         struct rcu_head         rcu;
  61 };
  62
  63 struct macvlan_skb_cb {
  64         const struct macvlan_dev *src;
  65 };
  66
  67 #define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0]))
  68
  69 static void macvlan_port_destroy(struct net_device *dev);
  70
  71 static inline bool macvlan_passthru(const struct macvlan_port *port)
  72 {
  73         return port->flags & MACVLAN_F_PASSTHRU;
  74 }
  75
  76 static inline void macvlan_set_passthru(struct macvlan_port *port)
  77 {
  78         port->flags |= MACVLAN_F_PASSTHRU;
  79 }
  80
  81 static inline bool macvlan_addr_change(const struct macvlan_port *port)
  82 {
  83         return port->flags & MACVLAN_F_ADDRCHANGE;
  84 }
  85
  86 static inline void macvlan_set_addr_change(struct macvlan_port *port)
  87 {
  88         port->flags |= MACVLAN_F_ADDRCHANGE;
  89 }
  90
  91 static inline void macvlan_clear_addr_change(struct macvlan_port *port)
  92 {
  93         port->flags &= ~MACVLAN_F_ADDRCHANGE;
  94 }
  95
  96 /* Hash Ethernet address */
  97 static u32 macvlan_eth_hash(const unsigned char *addr)
  98 {
  99         u64 value = get_unaligned((u64 *)addr);
 100
 101         /* only want 6 bytes */
 102 #ifdef __BIG_ENDIAN
 103         value >>= 16;
 104 #else
 105         value <<= 16;
 106 #endif
 107         return hash_64(value, MACVLAN_HASH_BITS);
 108 }
 109
 110 static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev)
 111 {
 112         return rcu_dereference(dev->rx_handler_data);
 113 }
 114
 115 static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev)
 116 {
 117         return rtnl_dereference(dev->rx_handler_data);
 118 }
 119
 120 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
 121                                                const unsigned char *addr)
 122 {
 123         struct macvlan_dev *vlan;
 124         u32 idx = macvlan_eth_hash(addr);
 125
 126         hlist_for_each_entry_rcu(vlan, &port->vlan_hash[idx], hlist,
 127                                  lockdep_rtnl_is_held()) {
 128                 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr))
 129                         return vlan;
 130         }
 131         return NULL;
 132 }
 133
 134 static struct macvlan_source_entry *macvlan_hash_lookup_source(
 135         const struct macvlan_dev *vlan,
 136         const unsigned char *addr)
 137 {
 138         struct macvlan_source_entry *entry;
 139         u32 idx = macvlan_eth_hash(addr);
 140         struct hlist_head *h = &vlan->port->vlan_source_hash[idx];
 141
 142         hlist_for_each_entry_rcu(entry, h, hlist) {
 143                 if (ether_addr_equal_64bits(entry->addr, addr) &&
 144                     entry->vlan == vlan)
 145                         return entry;
 146         }
 147         return NULL;
 148 }
 149
 150 static int macvlan_hash_add_source(struct macvlan_dev *vlan,
 151                                    const unsigned char *addr)
 152 {
 153         struct macvlan_port *port = vlan->port;
 154         struct macvlan_source_entry *entry;
 155         struct hlist_head *h;
 156
 157         entry = macvlan_hash_lookup_source(vlan, addr);
 158         if (entry)
 159                 return 0;
 160
 161         entry = kmalloc(sizeof(*entry), GFP_KERNEL);
 162         if (!entry)
 163                 return -ENOMEM;
 164
 165         ether_addr_copy(entry->addr, addr);
 166         entry->vlan = vlan;
 167         h = &port->vlan_source_hash[macvlan_eth_hash(addr)];
 168         hlist_add_head_rcu(&entry->hlist, h);
 169         vlan->macaddr_count++;
 170
 171         return 0;
 172 }
 173
 174 static void macvlan_hash_add(struct macvlan_dev *vlan)
 175 {
 176         struct macvlan_port *port = vlan->port;
 177         const unsigned char *addr = vlan->dev->dev_addr;
 178         u32 idx = macvlan_eth_hash(addr);
 179
 180         hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[idx]);
 181 }
 182
 183 static void macvlan_hash_del_source(struct macvlan_source_entry *entry)
 184 {
 185         hlist_del_rcu(&entry->hlist);
 186         kfree_rcu(entry, rcu);
 187 }
 188
 189 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
 190 {
 191         hlist_del_rcu(&vlan->hlist);
 192         if (sync)
 193                 synchronize_rcu();
 194 }
 195
 196 static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
 197                                         const unsigned char *addr)
 198 {
 199         macvlan_hash_del(vlan, true);
 200         /* Now that we are unhashed it is safe to change the device
 201          * address without confusing packet delivery.
 202          */
 203         memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
 204         macvlan_hash_add(vlan);
 205 }
 206
 207 static bool macvlan_addr_busy(const struct macvlan_port *port,
 208                               const unsigned char *addr)
 209 {
 210         /* Test to see if the specified address is
 211          * currently in use by the underlying device or
 212          * another macvlan.
 213          */
 214         if (!macvlan_passthru(port) && !macvlan_addr_change(port) &&
 215             ether_addr_equal_64bits(port->dev->dev_addr, addr))
 216                 return true;
 217
 218         if (macvlan_hash_lookup(port, addr))
 219                 return true;
 220
 221         return false;
 222 }
 223
 224
 225 static int macvlan_broadcast_one(struct sk_buff *skb,
 226                                  const struct macvlan_dev *vlan,
 227                                  const struct ethhdr *eth, bool local)
 228 {
 229         struct net_device *dev = vlan->dev;
 230
 231         if (local)
 232                 return __dev_forward_skb(dev, skb);
 233
 234         skb->dev = dev;
 235         if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
 236                 skb->pkt_type = PACKET_BROADCAST;
 237         else
 238                 skb->pkt_type = PACKET_MULTICAST;
 239
 240         return 0;
 241 }
 242
 243 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
 244 {
 245         return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT);
 246 }
 247
 248
 249 static unsigned int mc_hash(const struct macvlan_dev *vlan,
 250                             const unsigned char *addr)
 251 {
 252         u32 val = __get_unaligned_cpu32(addr + 2);
 253
 254         val ^= macvlan_hash_mix(vlan);
 255         return hash_32(val, MACVLAN_MC_FILTER_BITS);
 256 }
 257
 258 static void macvlan_broadcast(struct sk_buff *skb,
 259                               const struct macvlan_port *port,
 260                               struct net_device *src,
 261                               enum macvlan_mode mode)
 262 {
 263         const struct ethhdr *eth = eth_hdr(skb);
 264         const struct macvlan_dev *vlan;
 265         struct sk_buff *nskb;
 266         unsigned int i;
 267         int err;
 268         unsigned int hash;
 269
 270         if (skb->protocol == htons(ETH_P_PAUSE))
 271                 return;
 272
 273         for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
 274                 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) {
 275                         if (vlan->dev == src || !(vlan->mode & mode))
 276                                 continue;
 277
 278                         hash = mc_hash(vlan, eth->h_dest);
 279                         if (!test_bit(hash, vlan->mc_filter))
 280                                 continue;
 281
 282                         err = NET_RX_DROP;
 283                         nskb = skb_clone(skb, GFP_ATOMIC);
 284                         if (likely(nskb))
 285                                 err = macvlan_broadcast_one(
 286                                         nskb, vlan, eth,
 287                                         mode == MACVLAN_MODE_BRIDGE) ?:
 288                                       netif_rx_ni(nskb);
 289                         macvlan_count_rx(vlan, skb->len + ETH_HLEN,
 290                                          err == NET_RX_SUCCESS, true);
 291                 }
 292         }
 293 }
 294
 295 static void macvlan_process_broadcast(struct work_struct *w)
 296 {
 297         struct macvlan_port *port = container_of(w, struct macvlan_port,
 298                                                  bc_work);
 299         struct sk_buff *skb;
 300         struct sk_buff_head list;
 301
 302         __skb_queue_head_init(&list);
 303
 304         spin_lock_bh(&port->bc_queue.lock);
 305         skb_queue_splice_tail_init(&port->bc_queue, &list);
 306         spin_unlock_bh(&port->bc_queue.lock);
 307
 308         while ((skb = __skb_dequeue(&list))) {
 309                 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
 310
 311                 rcu_read_lock();
 312
 313                 if (!src)
 314                         /* frame comes from an external address */
 315                         macvlan_broadcast(skb, port, NULL,
 316                                           MACVLAN_MODE_PRIVATE |
 317                                           MACVLAN_MODE_VEPA    |
 318                                           MACVLAN_MODE_PASSTHRU|
 319                                           MACVLAN_MODE_BRIDGE);
 320                 else if (src->mode == MACVLAN_MODE_VEPA)
 321                         /* flood to everyone except source */
 322                         macvlan_broadcast(skb, port, src->dev,
 323                                           MACVLAN_MODE_VEPA |
 324                                           MACVLAN_MODE_BRIDGE);
 325                 else
 326                         /*
 327                          * flood only to VEPA ports, bridge ports
 328                          * already saw the frame on the way out.
 329                          */
 330                         macvlan_broadcast(skb, port, src->dev,
 331                                           MACVLAN_MODE_VEPA);
 332
 333                 rcu_read_unlock();
 334
 335                 if (src)
 336                         dev_put(src->dev);
 337                 consume_skb(skb);
 338
 339                 cond_resched();
 340         }
 341 }
 342
 343 static void macvlan_broadcast_enqueue(struct macvlan_port *port,
 344                                       const struct macvlan_dev *src,
 345                                       struct sk_buff *skb)
 346 {
 347         struct sk_buff *nskb;
 348         int err = -ENOMEM;
 349
 350         nskb = skb_clone(skb, GFP_ATOMIC);
 351         if (!nskb)
 352                 goto err;
 353
 354         MACVLAN_SKB_CB(nskb)->src = src;
 355
 356         spin_lock(&port->bc_queue.lock);
 357         if (skb_queue_len(&port->bc_queue) < MACVLAN_BC_QUEUE_LEN) {
 358                 if (src)
 359                         dev_hold(src->dev);
 360                 __skb_queue_tail(&port->bc_queue, nskb);
 361                 err = 0;
 362         }
 363         spin_unlock(&port->bc_queue.lock);
 364
 365         schedule_work(&port->bc_work);
 366
 367         if (err)
 368                 goto free_nskb;
 369
 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         /* Packets from dev_loopback_xmit() do not have L2 header, bail out */
 452         if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
 453                 return RX_HANDLER_PASS;
 454
 455         port = macvlan_port_get_rcu(skb->dev);
 456         if (is_multicast_ether_addr(eth->h_dest)) {
 457                 unsigned int hash;
 458
 459                 skb = ip_check_defrag(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN);
 460                 if (!skb)
 461                         return RX_HANDLER_CONSUMED;
 462                 *pskb = skb;
 463                 eth = eth_hdr(skb);
 464                 macvlan_forward_source(skb, port, eth->h_source);
 465                 src = macvlan_hash_lookup(port, eth->h_source);
 466                 if (src && src->mode != MACVLAN_MODE_VEPA &&
 467                     src->mode != MACVLAN_MODE_BRIDGE) {
 468                         /* forward to original port. */
 469                         vlan = src;
 470                         ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
 471                               netif_rx(skb);
 472                         handle_res = RX_HANDLER_CONSUMED;
 473                         goto out;
 474                 }
 475
 476                 hash = mc_hash(NULL, eth->h_dest);
 477                 if (test_bit(hash, port->mc_filter))
 478                         macvlan_broadcast_enqueue(port, src, skb);
 479
 480                 return RX_HANDLER_PASS;
 481         }
 482
 483         macvlan_forward_source(skb, port, eth->h_source);
 484         if (macvlan_passthru(port))
 485                 vlan = list_first_or_null_rcu(&port->vlans,
 486                                               struct macvlan_dev, list);
 487         else
 488                 vlan = macvlan_hash_lookup(port, eth->h_dest);
 489         if (!vlan || vlan->mode == MACVLAN_MODE_SOURCE)
 490                 return RX_HANDLER_PASS;
 491
 492         dev = vlan->dev;
 493         if (unlikely(!(dev->flags & IFF_UP))) {
 494                 kfree_skb(skb);
 495                 return RX_HANDLER_CONSUMED;
 496         }
 497         len = skb->len + ETH_HLEN;
 498         skb = skb_share_check(skb, GFP_ATOMIC);
 499         if (!skb) {
 500                 ret = NET_RX_DROP;
 501                 handle_res = RX_HANDLER_CONSUMED;
 502                 goto out;
 503         }
 504
 505         *pskb = skb;
 506         skb->dev = dev;
 507         skb->pkt_type = PACKET_HOST;
 508
 509         ret = NET_RX_SUCCESS;
 510         handle_res = RX_HANDLER_ANOTHER;
 511 out:
 512         macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
 513         return handle_res;
 514 }
 515
 516 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
 517 {
 518         const struct macvlan_dev *vlan = netdev_priv(dev);
 519         const struct macvlan_port *port = vlan->port;
 520         const struct macvlan_dev *dest;
 521
 522         if (vlan->mode == MACVLAN_MODE_BRIDGE) {
 523                 const struct ethhdr *eth = skb_eth_hdr(skb);
 524
 525                 /* send to other bridge ports directly */
 526                 if (is_multicast_ether_addr(eth->h_dest)) {
 527                         skb_reset_mac_header(skb);
 528                         macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
 529                         goto xmit_world;
 530                 }
 531
 532                 dest = macvlan_hash_lookup(port, eth->h_dest);
 533                 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
 534                         /* send to lowerdev first for its network taps */
 535                         dev_forward_skb(vlan->lowerdev, skb);
 536
 537                         return NET_XMIT_SUCCESS;
 538                 }
 539         }
 540 xmit_world:
 541         skb->dev = vlan->lowerdev;
 542         return dev_queue_xmit_accel(skb,
 543                                     netdev_get_sb_channel(dev) ? dev : NULL);
 544 }
 545
 546 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
 547 {
 548 #ifdef CONFIG_NET_POLL_CONTROLLER
 549         return netpoll_send_skb(vlan->netpoll, skb);
 550 #else
 551         BUG();
 552         return NETDEV_TX_OK;
 553 #endif
 554 }
 555
 556 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
 557                                       struct net_device *dev)
 558 {
 559         struct macvlan_dev *vlan = netdev_priv(dev);
 560         unsigned int len = skb->len;
 561         int ret;
 562
 563         if (unlikely(netpoll_tx_running(dev)))
 564                 return macvlan_netpoll_send_skb(vlan, skb);
 565
 566         ret = macvlan_queue_xmit(skb, dev);
 567
 568         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 569                 struct vlan_pcpu_stats *pcpu_stats;
 570
 571                 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
 572                 u64_stats_update_begin(&pcpu_stats->syncp);
 573                 pcpu_stats->tx_packets++;
 574                 pcpu_stats->tx_bytes += len;
 575                 u64_stats_update_end(&pcpu_stats->syncp);
 576         } else {
 577                 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
 578         }
 579         return ret;
 580 }
 581
 582 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
 583                                unsigned short type, const void *daddr,
 584                                const void *saddr, unsigned len)
 585 {
 586         const struct macvlan_dev *vlan = netdev_priv(dev);
 587         struct net_device *lowerdev = vlan->lowerdev;
 588
 589         return dev_hard_header(skb, lowerdev, type, daddr,
 590                                saddr ? : dev->dev_addr, len);
 591 }
 592
 593 static const struct header_ops macvlan_hard_header_ops = {
 594         .create         = macvlan_hard_header,
 595         .parse          = eth_header_parse,
 596         .cache          = eth_header_cache,
 597         .cache_update   = eth_header_cache_update,
 598 };
 599
 600 static int macvlan_open(struct net_device *dev)
 601 {
 602         struct macvlan_dev *vlan = netdev_priv(dev);
 603         struct net_device *lowerdev = vlan->lowerdev;
 604         int err;
 605
 606         if (macvlan_passthru(vlan->port)) {
 607                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
 608                         err = dev_set_promiscuity(lowerdev, 1);
 609                         if (err < 0)
 610                                 goto out;
 611                 }
 612                 goto hash_add;
 613         }
 614
 615         err = -EADDRINUSE;
 616         if (macvlan_addr_busy(vlan->port, dev->dev_addr))
 617                 goto out;
 618
 619         /* Attempt to populate accel_priv which is used to offload the L2
 620          * forwarding requests for unicast packets.
 621          */
 622         if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD)
 623                 vlan->accel_priv =
 624                       lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
 625
 626         /* If earlier attempt to offload failed, or accel_priv is not
 627          * populated we must add the unicast address to the lower device.
 628          */
 629         if (IS_ERR_OR_NULL(vlan->accel_priv)) {
 630                 vlan->accel_priv = NULL;
 631                 err = dev_uc_add(lowerdev, dev->dev_addr);
 632                 if (err < 0)
 633                         goto out;
 634         }
 635
 636         if (dev->flags & IFF_ALLMULTI) {
 637                 err = dev_set_allmulti(lowerdev, 1);
 638                 if (err < 0)
 639                         goto del_unicast;
 640         }
 641
 642         if (dev->flags & IFF_PROMISC) {
 643                 err = dev_set_promiscuity(lowerdev, 1);
 644                 if (err < 0)
 645                         goto clear_multi;
 646         }
 647
 648 hash_add:
 649         macvlan_hash_add(vlan);
 650         return 0;
 651
 652 clear_multi:
 653         if (dev->flags & IFF_ALLMULTI)
 654                 dev_set_allmulti(lowerdev, -1);
 655 del_unicast:
 656         if (vlan->accel_priv) {
 657                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
 658                                                            vlan->accel_priv);
 659                 vlan->accel_priv = NULL;
 660         } else {
 661                 dev_uc_del(lowerdev, dev->dev_addr);
 662         }
 663 out:
 664         return err;
 665 }
 666
 667 static int macvlan_stop(struct net_device *dev)
 668 {
 669         struct macvlan_dev *vlan = netdev_priv(dev);
 670         struct net_device *lowerdev = vlan->lowerdev;
 671
 672         if (vlan->accel_priv) {
 673                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
 674                                                            vlan->accel_priv);
 675                 vlan->accel_priv = NULL;
 676         }
 677
 678         dev_uc_unsync(lowerdev, dev);
 679         dev_mc_unsync(lowerdev, dev);
 680
 681         if (macvlan_passthru(vlan->port)) {
 682                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
 683                         dev_set_promiscuity(lowerdev, -1);
 684                 goto hash_del;
 685         }
 686
 687         if (dev->flags & IFF_ALLMULTI)
 688                 dev_set_allmulti(lowerdev, -1);
 689
 690         if (dev->flags & IFF_PROMISC)
 691                 dev_set_promiscuity(lowerdev, -1);
 692
 693         dev_uc_del(lowerdev, dev->dev_addr);
 694
 695 hash_del:
 696         macvlan_hash_del(vlan, !dev->dismantle);
 697         return 0;
 698 }
 699
 700 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
 701 {
 702         struct macvlan_dev *vlan = netdev_priv(dev);
 703         struct net_device *lowerdev = vlan->lowerdev;
 704         struct macvlan_port *port = vlan->port;
 705         int err;
 706
 707         if (!(dev->flags & IFF_UP)) {
 708                 /* Just copy in the new address */
 709                 ether_addr_copy(dev->dev_addr, addr);
 710         } else {
 711                 /* Rehash and update the device filters */
 712                 if (macvlan_addr_busy(vlan->port, addr))
 713                         return -EADDRINUSE;
 714
 715                 if (!macvlan_passthru(port)) {
 716                         err = dev_uc_add(lowerdev, addr);
 717                         if (err)
 718                                 return err;
 719
 720                         dev_uc_del(lowerdev, dev->dev_addr);
 721                 }
 722
 723                 macvlan_hash_change_addr(vlan, addr);
 724         }
 725         if (macvlan_passthru(port) && !macvlan_addr_change(port)) {
 726                 /* Since addr_change isn't set, we are here due to lower
 727                  * device change.  Save the lower-dev address so we can
 728                  * restore it later.
 729                  */
 730                 ether_addr_copy(vlan->port->perm_addr,
 731                                 lowerdev->dev_addr);
 732         }
 733         macvlan_clear_addr_change(port);
 734         return 0;
 735 }
 736
 737 static int macvlan_set_mac_address(struct net_device *dev, void *p)
 738 {
 739         struct macvlan_dev *vlan = netdev_priv(dev);
 740         struct sockaddr *addr = p;
 741
 742         if (!is_valid_ether_addr(addr->sa_data))
 743                 return -EADDRNOTAVAIL;
 744
 745         /* If the addresses are the same, this is a no-op */
 746         if (ether_addr_equal(dev->dev_addr, addr->sa_data))
 747                 return 0;
 748
 749         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
 750                 macvlan_set_addr_change(vlan->port);
 751                 return dev_set_mac_address(vlan->lowerdev, addr, NULL);
 752         }
 753
 754         if (macvlan_addr_busy(vlan->port, addr->sa_data))
 755                 return -EADDRINUSE;
 756
 757         return macvlan_sync_address(dev, addr->sa_data);
 758 }
 759
 760 static void macvlan_change_rx_flags(struct net_device *dev, int change)
 761 {
 762         struct macvlan_dev *vlan = netdev_priv(dev);
 763         struct net_device *lowerdev = vlan->lowerdev;
 764
 765         if (dev->flags & IFF_UP) {
 766                 if (change & IFF_ALLMULTI)
 767                         dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 768                 if (change & IFF_PROMISC)
 769                         dev_set_promiscuity(lowerdev,
 770                                             dev->flags & IFF_PROMISC ? 1 : -1);
 771
 772         }
 773 }
 774
 775 static void macvlan_compute_filter(unsigned long *mc_filter,
 776                                    struct net_device *dev,
 777                                    struct macvlan_dev *vlan)
 778 {
 779         if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
 780                 bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ);
 781         } else {
 782                 struct netdev_hw_addr *ha;
 783                 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
 784
 785                 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
 786                 netdev_for_each_mc_addr(ha, dev) {
 787                         __set_bit(mc_hash(vlan, ha->addr), filter);
 788                 }
 789
 790                 __set_bit(mc_hash(vlan, dev->broadcast), filter);
 791
 792                 bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ);
 793         }
 794 }
 795
 796 static void macvlan_set_mac_lists(struct net_device *dev)
 797 {
 798         struct macvlan_dev *vlan = netdev_priv(dev);
 799
 800         macvlan_compute_filter(vlan->mc_filter, dev, vlan);
 801
 802         dev_uc_sync(vlan->lowerdev, dev);
 803         dev_mc_sync(vlan->lowerdev, dev);
 804
 805         /* This is slightly inaccurate as we're including the subscription
 806          * list of vlan->lowerdev too.
 807          *
 808          * Bug alert: This only works if everyone has the same broadcast
 809          * address as lowerdev.  As soon as someone changes theirs this
 810          * will break.
 811          *
 812          * However, this is already broken as when you change your broadcast
 813          * address we don't get called.
 814          *
 815          * The solution is to maintain a list of broadcast addresses like
 816          * we do for uc/mc, if you care.
 817          */
 818         macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL);
 819 }
 820
 821 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
 822 {
 823         struct macvlan_dev *vlan = netdev_priv(dev);
 824
 825         if (vlan->lowerdev->mtu < new_mtu)
 826                 return -EINVAL;
 827         dev->mtu = new_mtu;
 828         return 0;
 829 }
 830
 831 static int macvlan_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 832 {
 833         struct net_device *real_dev = macvlan_dev_real_dev(dev);
 834         const struct net_device_ops *ops = real_dev->netdev_ops;
 835         struct ifreq ifrr;
 836         int err = -EOPNOTSUPP;
 837
 838         strscpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
 839         ifrr.ifr_ifru = ifr->ifr_ifru;
 840
 841         switch (cmd) {
 842         case SIOCSHWTSTAMP:
 843                 if (!net_eq(dev_net(dev), &init_net))
 844                         break;
 845                 /* fall through */
 846         case SIOCGHWTSTAMP:
 847                 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
 848                         err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
 849                 break;
 850         }
 851
 852         if (!err)
 853                 ifr->ifr_ifru = ifrr.ifr_ifru;
 854
 855         return err;
 856 }
 857
 858 /*
 859  * macvlan network devices have devices nesting below it and are a special
 860  * "super class" of normal network devices; split their locks off into a
 861  * separate class since they always nest.
 862  */
 863 #define ALWAYS_ON_OFFLOADS \
 864         (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | \
 865          NETIF_F_GSO_ROBUST | NETIF_F_GSO_ENCAP_ALL)
 866
 867 #define ALWAYS_ON_FEATURES (ALWAYS_ON_OFFLOADS | NETIF_F_LLTX)
 868
 869 #define MACVLAN_FEATURES \
 870         (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
 871          NETIF_F_GSO | NETIF_F_TSO | NETIF_F_LRO | \
 872          NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
 873          NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
 874
 875 #define MACVLAN_STATE_MASK \
 876         ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
 877
 878 static int macvlan_init(struct net_device *dev)
 879 {
 880         struct macvlan_dev *vlan = netdev_priv(dev);
 881         const struct net_device *lowerdev = vlan->lowerdev;
 882         struct macvlan_port *port = vlan->port;
 883
 884         dev->state              = (dev->state & ~MACVLAN_STATE_MASK) |
 885                                   (lowerdev->state & MACVLAN_STATE_MASK);
 886         dev->features           = lowerdev->features & MACVLAN_FEATURES;
 887         dev->features           |= ALWAYS_ON_FEATURES;
 888         dev->hw_features        |= NETIF_F_LRO;
 889         dev->vlan_features      = lowerdev->vlan_features & MACVLAN_FEATURES;
 890         dev->vlan_features      |= ALWAYS_ON_OFFLOADS;
 891         dev->hw_enc_features    |= dev->features;
 892         dev->gso_max_size       = lowerdev->gso_max_size;
 893         dev->gso_max_segs       = lowerdev->gso_max_segs;
 894         dev->hard_header_len    = lowerdev->hard_header_len;
 895
 896         netdev_lockdep_set_classes(dev);
 897
 898         vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
 899         if (!vlan->pcpu_stats)
 900                 return -ENOMEM;
 901
 902         port->count += 1;
 903
 904         return 0;
 905 }
 906
 907 static void macvlan_uninit(struct net_device *dev)
 908 {
 909         struct macvlan_dev *vlan = netdev_priv(dev);
 910         struct macvlan_port *port = vlan->port;
 911
 912         free_percpu(vlan->pcpu_stats);
 913
 914         macvlan_flush_sources(port, vlan);
 915         port->count -= 1;
 916         if (!port->count)
 917                 macvlan_port_destroy(port->dev);
 918 }
 919
 920 static void macvlan_dev_get_stats64(struct net_device *dev,
 921                                     struct rtnl_link_stats64 *stats)
 922 {
 923         struct macvlan_dev *vlan = netdev_priv(dev);
 924
 925         if (vlan->pcpu_stats) {
 926                 struct vlan_pcpu_stats *p;
 927                 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
 928                 u32 rx_errors = 0, tx_dropped = 0;
 929                 unsigned int start;
 930                 int i;
 931
 932                 for_each_possible_cpu(i) {
 933                         p = per_cpu_ptr(vlan->pcpu_stats, i);
 934                         do {
 935                                 start = u64_stats_fetch_begin_irq(&p->syncp);
 936                                 rx_packets      = p->rx_packets;
 937                                 rx_bytes        = p->rx_bytes;
 938                                 rx_multicast    = p->rx_multicast;
 939                                 tx_packets      = p->tx_packets;
 940                                 tx_bytes        = p->tx_bytes;
 941                         } while (u64_stats_fetch_retry_irq(&p->syncp, start));
 942
 943                         stats->rx_packets       += rx_packets;
 944                         stats->rx_bytes         += rx_bytes;
 945                         stats->multicast        += rx_multicast;
 946                         stats->tx_packets       += tx_packets;
 947                         stats->tx_bytes         += tx_bytes;
 948                         /* rx_errors & tx_dropped are u32, updated
 949                          * without syncp protection.
 950                          */
 951                         rx_errors       += p->rx_errors;
 952                         tx_dropped      += p->tx_dropped;
 953                 }
 954                 stats->rx_errors        = rx_errors;
 955                 stats->rx_dropped       = rx_errors;
 956                 stats->tx_dropped       = tx_dropped;
 957         }
 958 }
 959
 960 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
 961                                    __be16 proto, u16 vid)
 962 {
 963         struct macvlan_dev *vlan = netdev_priv(dev);
 964         struct net_device *lowerdev = vlan->lowerdev;
 965
 966         return vlan_vid_add(lowerdev, proto, vid);
 967 }
 968
 969 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
 970                                     __be16 proto, u16 vid)
 971 {
 972         struct macvlan_dev *vlan = netdev_priv(dev);
 973         struct net_device *lowerdev = vlan->lowerdev;
 974
 975         vlan_vid_del(lowerdev, proto, vid);
 976         return 0;
 977 }
 978
 979 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 980                            struct net_device *dev,
 981                            const unsigned char *addr, u16 vid,
 982                            u16 flags,
 983                            struct netlink_ext_ack *extack)
 984 {
 985         struct macvlan_dev *vlan = netdev_priv(dev);
 986         int err = -EINVAL;
 987
 988         /* Support unicast filter only on passthru devices.
 989          * Multicast filter should be allowed on all devices.
 990          */
 991         if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
 992                 return -EOPNOTSUPP;
 993
 994         if (flags & NLM_F_REPLACE)
 995                 return -EOPNOTSUPP;
 996
 997         if (is_unicast_ether_addr(addr))
 998                 err = dev_uc_add_excl(dev, addr);
 999         else if (is_multicast_ether_addr(addr))
1000                 err = dev_mc_add_excl(dev, addr);
1001
1002         return err;
1003 }
1004
1005 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
1006                            struct net_device *dev,
1007                            const unsigned char *addr, u16 vid)
1008 {
1009         struct macvlan_dev *vlan = netdev_priv(dev);
1010         int err = -EINVAL;
1011
1012         /* Support unicast filter only on passthru devices.
1013          * Multicast filter should be allowed on all devices.
1014          */
1015         if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
1016                 return -EOPNOTSUPP;
1017
1018         if (is_unicast_ether_addr(addr))
1019                 err = dev_uc_del(dev, addr);
1020         else if (is_multicast_ether_addr(addr))
1021                 err = dev_mc_del(dev, addr);
1022
1023         return err;
1024 }
1025
1026 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
1027                                         struct ethtool_drvinfo *drvinfo)
1028 {
1029         strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
1030         strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
1031 }
1032
1033 static int macvlan_ethtool_get_link_ksettings(struct net_device *dev,
1034                                               struct ethtool_link_ksettings *cmd)
1035 {
1036         const struct macvlan_dev *vlan = netdev_priv(dev);
1037
1038         return __ethtool_get_link_ksettings(vlan->lowerdev, cmd);
1039 }
1040
1041 static int macvlan_ethtool_get_ts_info(struct net_device *dev,
1042                                        struct ethtool_ts_info *info)
1043 {
1044         struct net_device *real_dev = macvlan_dev_real_dev(dev);
1045         const struct ethtool_ops *ops = real_dev->ethtool_ops;
1046         struct phy_device *phydev = real_dev->phydev;
1047
1048         if (phy_has_tsinfo(phydev)) {
1049                 return phy_ts_info(phydev, info);
1050         } else if (ops->get_ts_info) {
1051                 return ops->get_ts_info(real_dev, info);
1052         } else {
1053                 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
1054                         SOF_TIMESTAMPING_SOFTWARE;
1055                 info->phc_index = -1;
1056         }
1057
1058         return 0;
1059 }
1060
1061 static netdev_features_t macvlan_fix_features(struct net_device *dev,
1062                                               netdev_features_t features)
1063 {
1064         struct macvlan_dev *vlan = netdev_priv(dev);
1065         netdev_features_t lowerdev_features = vlan->lowerdev->features;
1066         netdev_features_t mask;
1067
1068         features |= NETIF_F_ALL_FOR_ALL;
1069         features &= (vlan->set_features | ~MACVLAN_FEATURES);
1070         mask = features;
1071
1072         lowerdev_features &= (features | ~NETIF_F_LRO);
1073         features = netdev_increment_features(lowerdev_features, features, mask);
1074         features |= ALWAYS_ON_FEATURES;
1075         features &= (ALWAYS_ON_FEATURES | MACVLAN_FEATURES);
1076
1077         return features;
1078 }
1079
1080 #ifdef CONFIG_NET_POLL_CONTROLLER
1081 static void macvlan_dev_poll_controller(struct net_device *dev)
1082 {
1083         return;
1084 }
1085
1086 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
1087 {
1088         struct macvlan_dev *vlan = netdev_priv(dev);
1089         struct net_device *real_dev = vlan->lowerdev;
1090         struct netpoll *netpoll;
1091         int err = 0;
1092
1093         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
1094         err = -ENOMEM;
1095         if (!netpoll)
1096                 goto out;
1097
1098         err = __netpoll_setup(netpoll, real_dev);
1099         if (err) {
1100                 kfree(netpoll);
1101                 goto out;
1102         }
1103
1104         vlan->netpoll = netpoll;
1105
1106 out:
1107         return err;
1108 }
1109
1110 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
1111 {
1112         struct macvlan_dev *vlan = netdev_priv(dev);
1113         struct netpoll *netpoll = vlan->netpoll;
1114
1115         if (!netpoll)
1116                 return;
1117
1118         vlan->netpoll = NULL;
1119
1120         __netpoll_free(netpoll);
1121 }
1122 #endif  /* CONFIG_NET_POLL_CONTROLLER */
1123
1124 static int macvlan_dev_get_iflink(const struct net_device *dev)
1125 {
1126         struct macvlan_dev *vlan = netdev_priv(dev);
1127
1128         return vlan->lowerdev->ifindex;
1129 }
1130
1131 static const struct ethtool_ops macvlan_ethtool_ops = {
1132         .get_link               = ethtool_op_get_link,
1133         .get_link_ksettings     = macvlan_ethtool_get_link_ksettings,
1134         .get_drvinfo            = macvlan_ethtool_get_drvinfo,
1135         .get_ts_info            = macvlan_ethtool_get_ts_info,
1136 };
1137
1138 static const struct net_device_ops macvlan_netdev_ops = {
1139         .ndo_init               = macvlan_init,
1140         .ndo_uninit             = macvlan_uninit,
1141         .ndo_open               = macvlan_open,
1142         .ndo_stop               = macvlan_stop,
1143         .ndo_start_xmit         = macvlan_start_xmit,
1144         .ndo_change_mtu         = macvlan_change_mtu,
1145         .ndo_do_ioctl           = macvlan_do_ioctl,
1146         .ndo_fix_features       = macvlan_fix_features,
1147         .ndo_change_rx_flags    = macvlan_change_rx_flags,
1148         .ndo_set_mac_address    = macvlan_set_mac_address,
1149         .ndo_set_rx_mode        = macvlan_set_mac_lists,
1150         .ndo_get_stats64        = macvlan_dev_get_stats64,
1151         .ndo_validate_addr      = eth_validate_addr,
1152         .ndo_vlan_rx_add_vid    = macvlan_vlan_rx_add_vid,
1153         .ndo_vlan_rx_kill_vid   = macvlan_vlan_rx_kill_vid,
1154         .ndo_fdb_add            = macvlan_fdb_add,
1155         .ndo_fdb_del            = macvlan_fdb_del,
1156         .ndo_fdb_dump           = ndo_dflt_fdb_dump,
1157 #ifdef CONFIG_NET_POLL_CONTROLLER
1158         .ndo_poll_controller    = macvlan_dev_poll_controller,
1159         .ndo_netpoll_setup      = macvlan_dev_netpoll_setup,
1160         .ndo_netpoll_cleanup    = macvlan_dev_netpoll_cleanup,
1161 #endif
1162         .ndo_get_iflink         = macvlan_dev_get_iflink,
1163         .ndo_features_check     = passthru_features_check,
1164         .ndo_change_proto_down  = dev_change_proto_down_generic,
1165 };
1166
1167 void macvlan_common_setup(struct net_device *dev)
1168 {
1169         ether_setup(dev);
1170
1171         dev->min_mtu            = 0;
1172         dev->max_mtu            = ETH_MAX_MTU;
1173         dev->priv_flags        &= ~IFF_TX_SKB_SHARING;
1174         netif_keep_dst(dev);
1175         dev->priv_flags        |= IFF_UNICAST_FLT;
1176         dev->netdev_ops         = &macvlan_netdev_ops;
1177         dev->needs_free_netdev  = true;
1178         dev->header_ops         = &macvlan_hard_header_ops;
1179         dev->ethtool_ops        = &macvlan_ethtool_ops;
1180 }
1181 EXPORT_SYMBOL_GPL(macvlan_common_setup);
1182
1183 static void macvlan_setup(struct net_device *dev)
1184 {
1185         macvlan_common_setup(dev);
1186         dev->priv_flags |= IFF_NO_QUEUE;
1187 }
1188
1189 static int macvlan_port_create(struct net_device *dev)
1190 {
1191         struct macvlan_port *port;
1192         unsigned int i;
1193         int err;
1194
1195         if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1196                 return -EINVAL;
1197
1198         if (netdev_is_rx_handler_busy(dev))
1199                 return -EBUSY;
1200
1201         port = kzalloc(sizeof(*port), GFP_KERNEL);
1202         if (port == NULL)
1203                 return -ENOMEM;
1204
1205         port->dev = dev;
1206         ether_addr_copy(port->perm_addr, dev->dev_addr);
1207         INIT_LIST_HEAD(&port->vlans);
1208         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1209                 INIT_HLIST_HEAD(&port->vlan_hash[i]);
1210         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1211                 INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1212
1213         skb_queue_head_init(&port->bc_queue);
1214         INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1215
1216         err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1217         if (err)
1218                 kfree(port);
1219         else
1220                 dev->priv_flags |= IFF_MACVLAN_PORT;
1221         return err;
1222 }
1223
1224 static void macvlan_port_destroy(struct net_device *dev)
1225 {
1226         struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1227         struct sk_buff *skb;
1228
1229         dev->priv_flags &= ~IFF_MACVLAN_PORT;
1230         netdev_rx_handler_unregister(dev);
1231
1232         /* After this point, no packet can schedule bc_work anymore,
1233          * but we need to cancel it and purge left skbs if any.
1234          */
1235         cancel_work_sync(&port->bc_work);
1236
1237         while ((skb = __skb_dequeue(&port->bc_queue))) {
1238                 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
1239
1240                 if (src)
1241                         dev_put(src->dev);
1242
1243                 kfree_skb(skb);
1244         }
1245
1246         /* If the lower device address has been changed by passthru
1247          * macvlan, put it back.
1248          */
1249         if (macvlan_passthru(port) &&
1250             !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) {
1251                 struct sockaddr sa;
1252
1253                 sa.sa_family = port->dev->type;
1254                 memcpy(&sa.sa_data, port->perm_addr, port->dev->addr_len);
1255                 dev_set_mac_address(port->dev, &sa, NULL);
1256         }
1257
1258         kfree(port);
1259 }
1260
1261 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[],
1262                             struct netlink_ext_ack *extack)
1263 {
1264         if (tb[IFLA_ADDRESS]) {
1265                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1266                         return -EINVAL;
1267                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1268                         return -EADDRNOTAVAIL;
1269         }
1270
1271         if (!data)
1272                 return 0;
1273
1274         if (data[IFLA_MACVLAN_FLAGS] &&
1275             nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
1276                 return -EINVAL;
1277
1278         if (data[IFLA_MACVLAN_MODE]) {
1279                 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1280                 case MACVLAN_MODE_PRIVATE:
1281                 case MACVLAN_MODE_VEPA:
1282                 case MACVLAN_MODE_BRIDGE:
1283                 case MACVLAN_MODE_PASSTHRU:
1284                 case MACVLAN_MODE_SOURCE:
1285                         break;
1286                 default:
1287                         return -EINVAL;
1288                 }
1289         }
1290
1291         if (data[IFLA_MACVLAN_MACADDR_MODE]) {
1292                 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1293                 case MACVLAN_MACADDR_ADD:
1294                 case MACVLAN_MACADDR_DEL:
1295                 case MACVLAN_MACADDR_FLUSH:
1296                 case MACVLAN_MACADDR_SET:
1297                         break;
1298                 default:
1299                         return -EINVAL;
1300                 }
1301         }
1302
1303         if (data[IFLA_MACVLAN_MACADDR]) {
1304                 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1305                         return -EINVAL;
1306
1307                 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1308                         return -EADDRNOTAVAIL;
1309         }
1310
1311         if (data[IFLA_MACVLAN_MACADDR_COUNT])
1312                 return -EINVAL;
1313
1314         return 0;
1315 }
1316
1317 /**
1318  * reconfigure list of remote source mac address
1319  * (only for macvlan devices in source mode)
1320  * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1321  * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1322  */
1323 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1324                                       struct nlattr *data[])
1325 {
1326         char *addr = NULL;
1327         int ret, rem, len;
1328         struct nlattr *nla, *head;
1329         struct macvlan_source_entry *entry;
1330
1331         if (data[IFLA_MACVLAN_MACADDR])
1332                 addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1333
1334         if (mode == MACVLAN_MACADDR_ADD) {
1335                 if (!addr)
1336                         return -EINVAL;
1337
1338                 return macvlan_hash_add_source(vlan, addr);
1339
1340         } else if (mode == MACVLAN_MACADDR_DEL) {
1341                 if (!addr)
1342                         return -EINVAL;
1343
1344                 entry = macvlan_hash_lookup_source(vlan, addr);
1345                 if (entry) {
1346                         macvlan_hash_del_source(entry);
1347                         vlan->macaddr_count--;
1348                 }
1349         } else if (mode == MACVLAN_MACADDR_FLUSH) {
1350                 macvlan_flush_sources(vlan->port, vlan);
1351         } else if (mode == MACVLAN_MACADDR_SET) {
1352                 macvlan_flush_sources(vlan->port, vlan);
1353
1354                 if (addr) {
1355                         ret = macvlan_hash_add_source(vlan, addr);
1356                         if (ret)
1357                                 return ret;
1358                 }
1359
1360                 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA])
1361                         return 0;
1362
1363                 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1364                 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1365
1366                 nla_for_each_attr(nla, head, len, rem) {
1367                         if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1368                             nla_len(nla) != ETH_ALEN)
1369                                 continue;
1370
1371                         addr = nla_data(nla);
1372                         ret = macvlan_hash_add_source(vlan, addr);
1373                         if (ret)
1374                                 return ret;
1375                 }
1376         } else {
1377                 return -EINVAL;
1378         }
1379
1380         return 0;
1381 }
1382
1383 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1384                            struct nlattr *tb[], struct nlattr *data[],
1385                            struct netlink_ext_ack *extack)
1386 {
1387         struct macvlan_dev *vlan = netdev_priv(dev);
1388         struct macvlan_port *port;
1389         struct net_device *lowerdev;
1390         int err;
1391         int macmode;
1392         bool create = false;
1393
1394         if (!tb[IFLA_LINK])
1395                 return -EINVAL;
1396
1397         lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1398         if (lowerdev == NULL)
1399                 return -ENODEV;
1400
1401         /* When creating macvlans or macvtaps on top of other macvlans - use
1402          * the real device as the lowerdev.
1403          */
1404         if (netif_is_macvlan(lowerdev))
1405                 lowerdev = macvlan_dev_real_dev(lowerdev);
1406
1407         if (!tb[IFLA_MTU])
1408                 dev->mtu = lowerdev->mtu;
1409         else if (dev->mtu > lowerdev->mtu)
1410                 return -EINVAL;
1411
1412         /* MTU range: 68 - lowerdev->max_mtu */
1413         dev->min_mtu = ETH_MIN_MTU;
1414         dev->max_mtu = lowerdev->max_mtu;
1415
1416         if (!tb[IFLA_ADDRESS])
1417                 eth_hw_addr_random(dev);
1418
1419         if (!netif_is_macvlan_port(lowerdev)) {
1420                 err = macvlan_port_create(lowerdev);
1421                 if (err < 0)
1422                         return err;
1423                 create = true;
1424         }
1425         port = macvlan_port_get_rtnl(lowerdev);
1426
1427         /* Only 1 macvlan device can be created in passthru mode */
1428         if (macvlan_passthru(port)) {
1429                 /* The macvlan port must be not created this time,
1430                  * still goto destroy_macvlan_port for readability.
1431                  */
1432                 err = -EINVAL;
1433                 goto destroy_macvlan_port;
1434         }
1435
1436         vlan->lowerdev = lowerdev;
1437         vlan->dev      = dev;
1438         vlan->port     = port;
1439         vlan->set_features = MACVLAN_FEATURES;
1440
1441         vlan->mode     = MACVLAN_MODE_VEPA;
1442         if (data && data[IFLA_MACVLAN_MODE])
1443                 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1444
1445         if (data && data[IFLA_MACVLAN_FLAGS])
1446                 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1447
1448         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1449                 if (port->count) {
1450                         err = -EINVAL;
1451                         goto destroy_macvlan_port;
1452                 }
1453                 macvlan_set_passthru(port);
1454                 eth_hw_addr_inherit(dev, lowerdev);
1455         }
1456
1457         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1458                 if (vlan->mode != MACVLAN_MODE_SOURCE) {
1459                         err = -EINVAL;
1460                         goto destroy_macvlan_port;
1461                 }
1462                 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1463                 err = macvlan_changelink_sources(vlan, macmode, data);
1464                 if (err)
1465                         goto destroy_macvlan_port;
1466         }
1467
1468         err = register_netdevice(dev);
1469         if (err < 0)
1470                 goto destroy_macvlan_port;
1471
1472         dev->priv_flags |= IFF_MACVLAN;
1473         err = netdev_upper_dev_link(lowerdev, dev, extack);
1474         if (err)
1475                 goto unregister_netdev;
1476
1477         list_add_tail_rcu(&vlan->list, &port->vlans);
1478         netif_stacked_transfer_operstate(lowerdev, dev);
1479         linkwatch_fire_event(dev);
1480
1481         return 0;
1482
1483 unregister_netdev:
1484         /* macvlan_uninit would free the macvlan port */
1485         unregister_netdevice(dev);
1486         return err;
1487 destroy_macvlan_port:
1488         /* the macvlan port may be freed by macvlan_uninit when fail to register.
1489          * so we destroy the macvlan port only when it's valid.
1490          */
1491         if (create && macvlan_port_get_rtnl(lowerdev))
1492                 macvlan_port_destroy(port->dev);
1493         return err;
1494 }
1495 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1496
1497 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1498                            struct nlattr *tb[], struct nlattr *data[],
1499                            struct netlink_ext_ack *extack)
1500 {
1501         return macvlan_common_newlink(src_net, dev, tb, data, extack);
1502 }
1503
1504 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1505 {
1506         struct macvlan_dev *vlan = netdev_priv(dev);
1507
1508         if (vlan->mode == MACVLAN_MODE_SOURCE)
1509                 macvlan_flush_sources(vlan->port, vlan);
1510         list_del_rcu(&vlan->list);
1511         unregister_netdevice_queue(dev, head);
1512         netdev_upper_dev_unlink(vlan->lowerdev, dev);
1513 }
1514 EXPORT_SYMBOL_GPL(macvlan_dellink);
1515
1516 static int macvlan_changelink(struct net_device *dev,
1517                               struct nlattr *tb[], struct nlattr *data[],
1518                               struct netlink_ext_ack *extack)
1519 {
1520         struct macvlan_dev *vlan = netdev_priv(dev);
1521         enum macvlan_mode mode;
1522         bool set_mode = false;
1523         enum macvlan_macaddr_mode macmode;
1524         int ret;
1525
1526         /* Validate mode, but don't set yet: setting flags may fail. */
1527         if (data && data[IFLA_MACVLAN_MODE]) {
1528                 set_mode = true;
1529                 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1530                 /* Passthrough mode can't be set or cleared dynamically */
1531                 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1532                     (vlan->mode == MACVLAN_MODE_PASSTHRU))
1533                         return -EINVAL;
1534                 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1535                     vlan->mode != mode)
1536                         macvlan_flush_sources(vlan->port, vlan);
1537         }
1538
1539         if (data && data[IFLA_MACVLAN_FLAGS]) {
1540                 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1541                 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1542                 if (macvlan_passthru(vlan->port) && promisc) {
1543                         int err;
1544
1545                         if (flags & MACVLAN_FLAG_NOPROMISC)
1546                                 err = dev_set_promiscuity(vlan->lowerdev, -1);
1547                         else
1548                                 err = dev_set_promiscuity(vlan->lowerdev, 1);
1549                         if (err < 0)
1550                                 return err;
1551                 }
1552                 vlan->flags = flags;
1553         }
1554         if (set_mode)
1555                 vlan->mode = mode;
1556         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1557                 if (vlan->mode != MACVLAN_MODE_SOURCE)
1558                         return -EINVAL;
1559                 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1560                 ret = macvlan_changelink_sources(vlan, macmode, data);
1561                 if (ret)
1562                         return ret;
1563         }
1564         return 0;
1565 }
1566
1567 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1568 {
1569         if (vlan->macaddr_count == 0)
1570                 return 0;
1571         return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1572                 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1573 }
1574
1575 static size_t macvlan_get_size(const struct net_device *dev)
1576 {
1577         struct macvlan_dev *vlan = netdev_priv(dev);
1578
1579         return (0
1580                 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1581                 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1582                 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1583                 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1584                 );
1585 }
1586
1587 static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1588                                      const struct macvlan_dev *vlan,
1589                                      const int i)
1590 {
1591         struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1592         struct macvlan_source_entry *entry;
1593
1594         hlist_for_each_entry_rcu(entry, h, hlist) {
1595                 if (entry->vlan != vlan)
1596                         continue;
1597                 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1598                         return 1;
1599         }
1600         return 0;
1601 }
1602
1603 static int macvlan_fill_info(struct sk_buff *skb,
1604                                 const struct net_device *dev)
1605 {
1606         struct macvlan_dev *vlan = netdev_priv(dev);
1607         int i;
1608         struct nlattr *nest;
1609
1610         if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1611                 goto nla_put_failure;
1612         if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1613                 goto nla_put_failure;
1614         if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1615                 goto nla_put_failure;
1616         if (vlan->macaddr_count > 0) {
1617                 nest = nla_nest_start_noflag(skb, IFLA_MACVLAN_MACADDR_DATA);
1618                 if (nest == NULL)
1619                         goto nla_put_failure;
1620
1621                 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1622                         if (macvlan_fill_info_macaddr(skb, vlan, i))
1623                                 goto nla_put_failure;
1624                 }
1625                 nla_nest_end(skb, nest);
1626         }
1627         return 0;
1628
1629 nla_put_failure:
1630         return -EMSGSIZE;
1631 }
1632
1633 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1634         [IFLA_MACVLAN_MODE]  = { .type = NLA_U32 },
1635         [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1636         [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1637         [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1638         [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1639         [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1640 };
1641
1642 int macvlan_link_register(struct rtnl_link_ops *ops)
1643 {
1644         /* common fields */
1645         ops->validate           = macvlan_validate;
1646         ops->maxtype            = IFLA_MACVLAN_MAX;
1647         ops->policy             = macvlan_policy;
1648         ops->changelink         = macvlan_changelink;
1649         ops->get_size           = macvlan_get_size;
1650         ops->fill_info          = macvlan_fill_info;
1651
1652         return rtnl_link_register(ops);
1653 };
1654 EXPORT_SYMBOL_GPL(macvlan_link_register);
1655
1656 static struct net *macvlan_get_link_net(const struct net_device *dev)
1657 {
1658         return dev_net(macvlan_dev_real_dev(dev));
1659 }
1660
1661 static struct rtnl_link_ops macvlan_link_ops = {
1662         .kind           = "macvlan",
1663         .setup          = macvlan_setup,
1664         .newlink        = macvlan_newlink,
1665         .dellink        = macvlan_dellink,
1666         .get_link_net   = macvlan_get_link_net,
1667         .priv_size      = sizeof(struct macvlan_dev),
1668 };
1669
1670 static int macvlan_device_event(struct notifier_block *unused,
1671                                 unsigned long event, void *ptr)
1672 {
1673         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1674         struct macvlan_dev *vlan, *next;
1675         struct macvlan_port *port;
1676         LIST_HEAD(list_kill);
1677
1678         if (!netif_is_macvlan_port(dev))
1679                 return NOTIFY_DONE;
1680
1681         port = macvlan_port_get_rtnl(dev);
1682
1683         switch (event) {
1684         case NETDEV_UP:
1685         case NETDEV_DOWN:
1686         case NETDEV_CHANGE:
1687                 list_for_each_entry(vlan, &port->vlans, list)
1688                         netif_stacked_transfer_operstate(vlan->lowerdev,
1689                                                          vlan->dev);
1690                 break;
1691         case NETDEV_FEAT_CHANGE:
1692                 list_for_each_entry(vlan, &port->vlans, list) {
1693                         vlan->dev->gso_max_size = dev->gso_max_size;
1694                         vlan->dev->gso_max_segs = dev->gso_max_segs;
1695                         netdev_update_features(vlan->dev);
1696                 }
1697                 break;
1698         case NETDEV_CHANGEMTU:
1699                 list_for_each_entry(vlan, &port->vlans, list) {
1700                         if (vlan->dev->mtu <= dev->mtu)
1701                                 continue;
1702                         dev_set_mtu(vlan->dev, dev->mtu);
1703                 }
1704                 break;
1705         case NETDEV_CHANGEADDR:
1706                 if (!macvlan_passthru(port))
1707                         return NOTIFY_DONE;
1708
1709                 vlan = list_first_entry_or_null(&port->vlans,
1710                                                 struct macvlan_dev,
1711                                                 list);
1712
1713                 if (vlan && macvlan_sync_address(vlan->dev, dev->dev_addr))
1714                         return NOTIFY_BAD;
1715
1716                 break;
1717         case NETDEV_UNREGISTER:
1718                 /* twiddle thumbs on netns device moves */
1719                 if (dev->reg_state != NETREG_UNREGISTERING)
1720                         break;
1721
1722                 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1723                         vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1724                 unregister_netdevice_many(&list_kill);
1725                 break;
1726         case NETDEV_PRE_TYPE_CHANGE:
1727                 /* Forbid underlaying device to change its type. */
1728                 return NOTIFY_BAD;
1729
1730         case NETDEV_NOTIFY_PEERS:
1731         case NETDEV_BONDING_FAILOVER:
1732         case NETDEV_RESEND_IGMP:
1733                 /* Propagate to all vlans */
1734                 list_for_each_entry(vlan, &port->vlans, list)
1735                         call_netdevice_notifiers(event, vlan->dev);
1736         }
1737         return NOTIFY_DONE;
1738 }
1739
1740 static struct notifier_block macvlan_notifier_block __read_mostly = {
1741         .notifier_call  = macvlan_device_event,
1742 };
1743
1744 static int __init macvlan_init_module(void)
1745 {
1746         int err;
1747
1748         register_netdevice_notifier(&macvlan_notifier_block);
1749
1750         err = macvlan_link_register(&macvlan_link_ops);
1751         if (err < 0)
1752                 goto err1;
1753         return 0;
1754 err1:
1755         unregister_netdevice_notifier(&macvlan_notifier_block);
1756         return err;
1757 }
1758
1759 static void __exit macvlan_cleanup_module(void)
1760 {
1761         rtnl_link_unregister(&macvlan_link_ops);
1762         unregister_netdevice_notifier(&macvlan_notifier_block);
1763 }
1764
1765 module_init(macvlan_init_module);
1766 module_exit(macvlan_cleanup_module);
1767
1768 MODULE_LICENSE("GPL");
1769 MODULE_AUTHOR("Patrick McHardy <[email protected]>");
1770 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1771 MODULE_ALIAS_RTNL_LINK("macvlan");