drivers/net/macvlan.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (c) 2007 Patrick McHardy <kaber@trash.net>
   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, ajz@cambridgebroadband.com
   9  * Re-worked by Ben Greear <greearb@candelatech.com>
  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                 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr))
 128                         return vlan;
 129         }
 130         return NULL;
 131 }
 132
 133 static struct macvlan_source_entry *macvlan_hash_lookup_source(
 134         const struct macvlan_dev *vlan,
 135         const unsigned char *addr)
 136 {
 137         struct macvlan_source_entry *entry;
 138         u32 idx = macvlan_eth_hash(addr);
 139         struct hlist_head *h = &vlan->port->vlan_source_hash[idx];
 140
 141         hlist_for_each_entry_rcu(entry, h, hlist) {
 142                 if (ether_addr_equal_64bits(entry->addr, addr) &&
 143                     entry->vlan == vlan)
 144                         return entry;
 145         }
 146         return NULL;
 147 }
 148
 149 static int macvlan_hash_add_source(struct macvlan_dev *vlan,
 150                                    const unsigned char *addr)
 151 {
 152         struct macvlan_port *port = vlan->port;
 153         struct macvlan_source_entry *entry;
 154         struct hlist_head *h;
 155
 156         entry = macvlan_hash_lookup_source(vlan, addr);
 157         if (entry)
 158                 return 0;
 159
 160         entry = kmalloc(sizeof(*entry), GFP_KERNEL);
 161         if (!entry)
 162                 return -ENOMEM;
 163
 164         ether_addr_copy(entry->addr, addr);
 165         entry->vlan = vlan;
 166         h = &port->vlan_source_hash[macvlan_eth_hash(addr)];
 167         hlist_add_head_rcu(&entry->hlist, h);
 168         vlan->macaddr_count++;
 169
 170         return 0;
 171 }
 172
 173 static void macvlan_hash_add(struct macvlan_dev *vlan)
 174 {
 175         struct macvlan_port *port = vlan->port;
 176         const unsigned char *addr = vlan->dev->dev_addr;
 177         u32 idx = macvlan_eth_hash(addr);
 178
 179         hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[idx]);
 180 }
 181
 182 static void macvlan_hash_del_source(struct macvlan_source_entry *entry)
 183 {
 184         hlist_del_rcu(&entry->hlist);
 185         kfree_rcu(entry, rcu);
 186 }
 187
 188 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
 189 {
 190         hlist_del_rcu(&vlan->hlist);
 191         if (sync)
 192                 synchronize_rcu();
 193 }
 194
 195 static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
 196                                         const unsigned char *addr)
 197 {
 198         macvlan_hash_del(vlan, true);
 199         /* Now that we are unhashed it is safe to change the device
 200          * address without confusing packet delivery.
 201          */
 202         memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
 203         macvlan_hash_add(vlan);
 204 }
 205
 206 static bool macvlan_addr_busy(const struct macvlan_port *port,
 207                               const unsigned char *addr)
 208 {
 209         /* Test to see if the specified address is
 210          * currently in use by the underlying device or
 211          * another macvlan.
 212          */
 213         if (!macvlan_passthru(port) && !macvlan_addr_change(port) &&
 214             ether_addr_equal_64bits(port->dev->dev_addr, addr))
 215                 return true;
 216
 217         if (macvlan_hash_lookup(port, addr))
 218                 return true;
 219
 220         return false;
 221 }
 222
 223
 224 static int macvlan_broadcast_one(struct sk_buff *skb,
 225                                  const struct macvlan_dev *vlan,
 226                                  const struct ethhdr *eth, bool local)
 227 {
 228         struct net_device *dev = vlan->dev;
 229
 230         if (local)
 231                 return __dev_forward_skb(dev, skb);
 232
 233         skb->dev = dev;
 234         if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
 235                 skb->pkt_type = PACKET_BROADCAST;
 236         else
 237                 skb->pkt_type = PACKET_MULTICAST;
 238
 239         return 0;
 240 }
 241
 242 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
 243 {
 244         return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT);
 245 }
 246
 247
 248 static unsigned int mc_hash(const struct macvlan_dev *vlan,
 249                             const unsigned char *addr)
 250 {
 251         u32 val = __get_unaligned_cpu32(addr + 2);
 252
 253         val ^= macvlan_hash_mix(vlan);
 254         return hash_32(val, MACVLAN_MC_FILTER_BITS);
 255 }
 256
 257 static void macvlan_broadcast(struct sk_buff *skb,
 258                               const struct macvlan_port *port,
 259                               struct net_device *src,
 260                               enum macvlan_mode mode)
 261 {
 262         const struct ethhdr *eth = eth_hdr(skb);
 263         const struct macvlan_dev *vlan;
 264         struct sk_buff *nskb;
 265         unsigned int i;
 266         int err;
 267         unsigned int hash;
 268
 269         if (skb->protocol == htons(ETH_P_PAUSE))
 270                 return;
 271
 272         for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
 273                 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) {
 274                         if (vlan->dev == src || !(vlan->mode & mode))
 275                                 continue;
 276
 277                         hash = mc_hash(vlan, eth->h_dest);
 278                         if (!test_bit(hash, vlan->mc_filter))
 279                                 continue;
 280
 281                         err = NET_RX_DROP;
 282                         nskb = skb_clone(skb, GFP_ATOMIC);
 283                         if (likely(nskb))
 284                                 err = macvlan_broadcast_one(
 285                                         nskb, vlan, eth,
 286                                         mode == MACVLAN_MODE_BRIDGE) ?:
 287                                       netif_rx_ni(nskb);
 288                         macvlan_count_rx(vlan, skb->len + ETH_HLEN,
 289                                          err == NET_RX_SUCCESS, true);
 290                 }
 291         }
 292 }
 293
 294 static void macvlan_process_broadcast(struct work_struct *w)
 295 {
 296         struct macvlan_port *port = container_of(w, struct macvlan_port,
 297                                                  bc_work);
 298         struct sk_buff *skb;
 299         struct sk_buff_head list;
 300
 301         __skb_queue_head_init(&list);
 302
 303         spin_lock_bh(&port->bc_queue.lock);
 304         skb_queue_splice_tail_init(&port->bc_queue, &list);
 305         spin_unlock_bh(&port->bc_queue.lock);
 306
 307         while ((skb = __skb_dequeue(&list))) {
 308                 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
 309
 310                 rcu_read_lock();
 311
 312                 if (!src)
 313                         /* frame comes from an external address */
 314                         macvlan_broadcast(skb, port, NULL,
 315                                           MACVLAN_MODE_PRIVATE |
 316                                           MACVLAN_MODE_VEPA    |
 317                                           MACVLAN_MODE_PASSTHRU|
 318                                           MACVLAN_MODE_BRIDGE);
 319                 else if (src->mode == MACVLAN_MODE_VEPA)
 320                         /* flood to everyone except source */
 321                         macvlan_broadcast(skb, port, src->dev,
 322                                           MACVLAN_MODE_VEPA |
 323                                           MACVLAN_MODE_BRIDGE);
 324                 else
 325                         /*
 326                          * flood only to VEPA ports, bridge ports
 327                          * already saw the frame on the way out.
 328                          */
 329                         macvlan_broadcast(skb, port, src->dev,
 330                                           MACVLAN_MODE_VEPA);
 331
 332                 rcu_read_unlock();
 333
 334                 if (src)
 335                         dev_put(src->dev);
 336                 consume_skb(skb);
 337         }
 338 }
 339
 340 static void macvlan_broadcast_enqueue(struct macvlan_port *port,
 341                                       const struct macvlan_dev *src,
 342                                       struct sk_buff *skb)
 343 {
 344         struct sk_buff *nskb;
 345         int err = -ENOMEM;
 346
 347         nskb = skb_clone(skb, GFP_ATOMIC);
 348         if (!nskb)
 349                 goto err;
 350
 351         MACVLAN_SKB_CB(nskb)->src = src;
 352
 353         spin_lock(&port->bc_queue.lock);
 354         if (skb_queue_len(&port->bc_queue) < MACVLAN_BC_QUEUE_LEN) {
 355                 if (src)
 356                         dev_hold(src->dev);
 357                 __skb_queue_tail(&port->bc_queue, nskb);
 358                 err = 0;
 359         }
 360         spin_unlock(&port->bc_queue.lock);
 361
 362         schedule_work(&port->bc_work);
 363
 364         if (err)
 365                 goto free_nskb;
 366
 367         return;
 368
 369 free_nskb:
 370         kfree_skb(nskb);
 371 err:
 372         atomic_long_inc(&skb->dev->rx_dropped);
 373 }
 374
 375 static void macvlan_flush_sources(struct macvlan_port *port,
 376                                   struct macvlan_dev *vlan)
 377 {
 378         int i;
 379
 380         for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
 381                 struct hlist_node *h, *n;
 382
 383                 hlist_for_each_safe(h, n, &port->vlan_source_hash[i]) {
 384                         struct macvlan_source_entry *entry;
 385
 386                         entry = hlist_entry(h, struct macvlan_source_entry,
 387                                             hlist);
 388                         if (entry->vlan == vlan)
 389                                 macvlan_hash_del_source(entry);
 390                 }
 391         }
 392         vlan->macaddr_count = 0;
 393 }
 394
 395 static void macvlan_forward_source_one(struct sk_buff *skb,
 396                                        struct macvlan_dev *vlan)
 397 {
 398         struct sk_buff *nskb;
 399         struct net_device *dev;
 400         int len;
 401         int ret;
 402
 403         dev = vlan->dev;
 404         if (unlikely(!(dev->flags & IFF_UP)))
 405                 return;
 406
 407         nskb = skb_clone(skb, GFP_ATOMIC);
 408         if (!nskb)
 409                 return;
 410
 411         len = nskb->len + ETH_HLEN;
 412         nskb->dev = dev;
 413
 414         if (ether_addr_equal_64bits(eth_hdr(skb)->h_dest, dev->dev_addr))
 415                 nskb->pkt_type = PACKET_HOST;
 416
 417         ret = netif_rx(nskb);
 418         macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
 419 }
 420
 421 static void macvlan_forward_source(struct sk_buff *skb,
 422                                    struct macvlan_port *port,
 423                                    const unsigned char *addr)
 424 {
 425         struct macvlan_source_entry *entry;
 426         u32 idx = macvlan_eth_hash(addr);
 427         struct hlist_head *h = &port->vlan_source_hash[idx];
 428
 429         hlist_for_each_entry_rcu(entry, h, hlist) {
 430                 if (ether_addr_equal_64bits(entry->addr, addr))
 431                         macvlan_forward_source_one(skb, entry->vlan);
 432         }
 433 }
 434
 435 /* called under rcu_read_lock() from netif_receive_skb */
 436 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
 437 {
 438         struct macvlan_port *port;
 439         struct sk_buff *skb = *pskb;
 440         const struct ethhdr *eth = eth_hdr(skb);
 441         const struct macvlan_dev *vlan;
 442         const struct macvlan_dev *src;
 443         struct net_device *dev;
 444         unsigned int len = 0;
 445         int ret;
 446         rx_handler_result_t handle_res;
 447
 448         port = macvlan_port_get_rcu(skb->dev);
 449         if (is_multicast_ether_addr(eth->h_dest)) {
 450                 unsigned int hash;
 451
 452                 skb = ip_check_defrag(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN);
 453                 if (!skb)
 454                         return RX_HANDLER_CONSUMED;
 455                 *pskb = skb;
 456                 eth = eth_hdr(skb);
 457                 macvlan_forward_source(skb, port, eth->h_source);
 458                 src = macvlan_hash_lookup(port, eth->h_source);
 459                 if (src && src->mode != MACVLAN_MODE_VEPA &&
 460                     src->mode != MACVLAN_MODE_BRIDGE) {
 461                         /* forward to original port. */
 462                         vlan = src;
 463                         ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
 464                               netif_rx(skb);
 465                         handle_res = RX_HANDLER_CONSUMED;
 466                         goto out;
 467                 }
 468
 469                 hash = mc_hash(NULL, eth->h_dest);
 470                 if (test_bit(hash, port->mc_filter))
 471                         macvlan_broadcast_enqueue(port, src, skb);
 472
 473                 return RX_HANDLER_PASS;
 474         }
 475
 476         macvlan_forward_source(skb, port, eth->h_source);
 477         if (macvlan_passthru(port))
 478                 vlan = list_first_or_null_rcu(&port->vlans,
 479                                               struct macvlan_dev, list);
 480         else
 481                 vlan = macvlan_hash_lookup(port, eth->h_dest);
 482         if (!vlan || vlan->mode == MACVLAN_MODE_SOURCE)
 483                 return RX_HANDLER_PASS;
 484
 485         dev = vlan->dev;
 486         if (unlikely(!(dev->flags & IFF_UP))) {
 487                 kfree_skb(skb);
 488                 return RX_HANDLER_CONSUMED;
 489         }
 490         len = skb->len + ETH_HLEN;
 491         skb = skb_share_check(skb, GFP_ATOMIC);
 492         if (!skb) {
 493                 ret = NET_RX_DROP;
 494                 handle_res = RX_HANDLER_CONSUMED;
 495                 goto out;
 496         }
 497
 498         *pskb = skb;
 499         skb->dev = dev;
 500         skb->pkt_type = PACKET_HOST;
 501
 502         ret = NET_RX_SUCCESS;
 503         handle_res = RX_HANDLER_ANOTHER;
 504 out:
 505         macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
 506         return handle_res;
 507 }
 508
 509 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
 510 {
 511         const struct macvlan_dev *vlan = netdev_priv(dev);
 512         const struct macvlan_port *port = vlan->port;
 513         const struct macvlan_dev *dest;
 514
 515         if (vlan->mode == MACVLAN_MODE_BRIDGE) {
 516                 const struct ethhdr *eth = (void *)skb->data;
 517
 518                 /* send to other bridge ports directly */
 519                 if (is_multicast_ether_addr(eth->h_dest)) {
 520                         macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
 521                         goto xmit_world;
 522                 }
 523
 524                 dest = macvlan_hash_lookup(port, eth->h_dest);
 525                 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
 526                         /* send to lowerdev first for its network taps */
 527                         dev_forward_skb(vlan->lowerdev, skb);
 528
 529                         return NET_XMIT_SUCCESS;
 530                 }
 531         }
 532 xmit_world:
 533         skb->dev = vlan->lowerdev;
 534         return dev_queue_xmit_accel(skb,
 535                                     netdev_get_sb_channel(dev) ? dev : NULL);
 536 }
 537
 538 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
 539 {
 540 #ifdef CONFIG_NET_POLL_CONTROLLER
 541         if (vlan->netpoll)
 542                 netpoll_send_skb(vlan->netpoll, skb);
 543 #else
 544         BUG();
 545 #endif
 546         return NETDEV_TX_OK;
 547 }
 548
 549 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
 550                                       struct net_device *dev)
 551 {
 552         struct macvlan_dev *vlan = netdev_priv(dev);
 553         unsigned int len = skb->len;
 554         int ret;
 555
 556         if (unlikely(netpoll_tx_running(dev)))
 557                 return macvlan_netpoll_send_skb(vlan, skb);
 558
 559         ret = macvlan_queue_xmit(skb, dev);
 560
 561         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 562                 struct vlan_pcpu_stats *pcpu_stats;
 563
 564                 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
 565                 u64_stats_update_begin(&pcpu_stats->syncp);
 566                 pcpu_stats->tx_packets++;
 567                 pcpu_stats->tx_bytes += len;
 568                 u64_stats_update_end(&pcpu_stats->syncp);
 569         } else {
 570                 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
 571         }
 572         return ret;
 573 }
 574
 575 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
 576                                unsigned short type, const void *daddr,
 577                                const void *saddr, unsigned len)
 578 {
 579         const struct macvlan_dev *vlan = netdev_priv(dev);
 580         struct net_device *lowerdev = vlan->lowerdev;
 581
 582         return dev_hard_header(skb, lowerdev, type, daddr,
 583                                saddr ? : dev->dev_addr, len);
 584 }
 585
 586 static const struct header_ops macvlan_hard_header_ops = {
 587         .create         = macvlan_hard_header,
 588         .parse          = eth_header_parse,
 589         .cache          = eth_header_cache,
 590         .cache_update   = eth_header_cache_update,
 591 };
 592
 593 static int macvlan_open(struct net_device *dev)
 594 {
 595         struct macvlan_dev *vlan = netdev_priv(dev);
 596         struct net_device *lowerdev = vlan->lowerdev;
 597         int err;
 598
 599         if (macvlan_passthru(vlan->port)) {
 600                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
 601                         err = dev_set_promiscuity(lowerdev, 1);
 602                         if (err < 0)
 603                                 goto out;
 604                 }
 605                 goto hash_add;
 606         }
 607
 608         err = -EADDRINUSE;
 609         if (macvlan_addr_busy(vlan->port, dev->dev_addr))
 610                 goto out;
 611
 612         /* Attempt to populate accel_priv which is used to offload the L2
 613          * forwarding requests for unicast packets.
 614          */
 615         if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD)
 616                 vlan->accel_priv =
 617                       lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
 618
 619         /* If earlier attempt to offload failed, or accel_priv is not
 620          * populated we must add the unicast address to the lower device.
 621          */
 622         if (IS_ERR_OR_NULL(vlan->accel_priv)) {
 623                 vlan->accel_priv = NULL;
 624                 err = dev_uc_add(lowerdev, dev->dev_addr);
 625                 if (err < 0)
 626                         goto out;
 627         }
 628
 629         if (dev->flags & IFF_ALLMULTI) {
 630                 err = dev_set_allmulti(lowerdev, 1);
 631                 if (err < 0)
 632                         goto del_unicast;
 633         }
 634
 635         if (dev->flags & IFF_PROMISC) {
 636                 err = dev_set_promiscuity(lowerdev, 1);
 637                 if (err < 0)
 638                         goto clear_multi;
 639         }
 640
 641 hash_add:
 642         macvlan_hash_add(vlan);
 643         return 0;
 644
 645 clear_multi:
 646         if (dev->flags & IFF_ALLMULTI)
 647                 dev_set_allmulti(lowerdev, -1);
 648 del_unicast:
 649         if (vlan->accel_priv) {
 650                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
 651                                                            vlan->accel_priv);
 652                 vlan->accel_priv = NULL;
 653         } else {
 654                 dev_uc_del(lowerdev, dev->dev_addr);
 655         }
 656 out:
 657         return err;
 658 }
 659
 660 static int macvlan_stop(struct net_device *dev)
 661 {
 662         struct macvlan_dev *vlan = netdev_priv(dev);
 663         struct net_device *lowerdev = vlan->lowerdev;
 664
 665         if (vlan->accel_priv) {
 666                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
 667                                                            vlan->accel_priv);
 668                 vlan->accel_priv = NULL;
 669         }
 670
 671         dev_uc_unsync(lowerdev, dev);
 672         dev_mc_unsync(lowerdev, dev);
 673
 674         if (macvlan_passthru(vlan->port)) {
 675                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
 676                         dev_set_promiscuity(lowerdev, -1);
 677                 goto hash_del;
 678         }
 679
 680         if (dev->flags & IFF_ALLMULTI)
 681                 dev_set_allmulti(lowerdev, -1);
 682
 683         if (dev->flags & IFF_PROMISC)
 684                 dev_set_promiscuity(lowerdev, -1);
 685
 686         dev_uc_del(lowerdev, dev->dev_addr);
 687
 688 hash_del:
 689         macvlan_hash_del(vlan, !dev->dismantle);
 690         return 0;
 691 }
 692
 693 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
 694 {
 695         struct macvlan_dev *vlan = netdev_priv(dev);
 696         struct net_device *lowerdev = vlan->lowerdev;
 697         struct macvlan_port *port = vlan->port;
 698         int err;
 699
 700         if (!(dev->flags & IFF_UP)) {
 701                 /* Just copy in the new address */
 702                 ether_addr_copy(dev->dev_addr, addr);
 703         } else {
 704                 /* Rehash and update the device filters */
 705                 if (macvlan_addr_busy(vlan->port, addr))
 706                         return -EADDRINUSE;
 707
 708                 if (!macvlan_passthru(port)) {
 709                         err = dev_uc_add(lowerdev, addr);
 710                         if (err)
 711                                 return err;
 712
 713                         dev_uc_del(lowerdev, dev->dev_addr);
 714                 }
 715
 716                 macvlan_hash_change_addr(vlan, addr);
 717         }
 718         if (macvlan_passthru(port) && !macvlan_addr_change(port)) {
 719                 /* Since addr_change isn't set, we are here due to lower
 720                  * device change.  Save the lower-dev address so we can
 721                  * restore it later.
 722                  */
 723                 ether_addr_copy(vlan->port->perm_addr,
 724                                 lowerdev->dev_addr);
 725         }
 726         macvlan_clear_addr_change(port);
 727         return 0;
 728 }
 729
 730 static int macvlan_set_mac_address(struct net_device *dev, void *p)
 731 {
 732         struct macvlan_dev *vlan = netdev_priv(dev);
 733         struct sockaddr *addr = p;
 734
 735         if (!is_valid_ether_addr(addr->sa_data))
 736                 return -EADDRNOTAVAIL;
 737
 738         /* If the addresses are the same, this is a no-op */
 739         if (ether_addr_equal(dev->dev_addr, addr->sa_data))
 740                 return 0;
 741
 742         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
 743                 macvlan_set_addr_change(vlan->port);
 744                 return dev_set_mac_address(vlan->lowerdev, addr, NULL);
 745         }
 746
 747         if (macvlan_addr_busy(vlan->port, addr->sa_data))
 748                 return -EADDRINUSE;
 749
 750         return macvlan_sync_address(dev, addr->sa_data);
 751 }
 752
 753 static void macvlan_change_rx_flags(struct net_device *dev, int change)
 754 {
 755         struct macvlan_dev *vlan = netdev_priv(dev);
 756         struct net_device *lowerdev = vlan->lowerdev;
 757
 758         if (dev->flags & IFF_UP) {
 759                 if (change & IFF_ALLMULTI)
 760                         dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 761                 if (change & IFF_PROMISC)
 762                         dev_set_promiscuity(lowerdev,
 763                                             dev->flags & IFF_PROMISC ? 1 : -1);
 764
 765         }
 766 }
 767
 768 static void macvlan_compute_filter(unsigned long *mc_filter,
 769                                    struct net_device *dev,
 770                                    struct macvlan_dev *vlan)
 771 {
 772         if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
 773                 bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ);
 774         } else {
 775                 struct netdev_hw_addr *ha;
 776                 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
 777
 778                 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
 779                 netdev_for_each_mc_addr(ha, dev) {
 780                         __set_bit(mc_hash(vlan, ha->addr), filter);
 781                 }
 782
 783                 __set_bit(mc_hash(vlan, dev->broadcast), filter);
 784
 785                 bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ);
 786         }
 787 }
 788
 789 static void macvlan_set_mac_lists(struct net_device *dev)
 790 {
 791         struct macvlan_dev *vlan = netdev_priv(dev);
 792
 793         macvlan_compute_filter(vlan->mc_filter, dev, vlan);
 794
 795         dev_uc_sync(vlan->lowerdev, dev);
 796         dev_mc_sync(vlan->lowerdev, dev);
 797
 798         /* This is slightly inaccurate as we're including the subscription
 799          * list of vlan->lowerdev too.
 800          *
 801          * Bug alert: This only works if everyone has the same broadcast
 802          * address as lowerdev.  As soon as someone changes theirs this
 803          * will break.
 804          *
 805          * However, this is already broken as when you change your broadcast
 806          * address we don't get called.
 807          *
 808          * The solution is to maintain a list of broadcast addresses like
 809          * we do for uc/mc, if you care.
 810          */
 811         macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL);
 812 }
 813
 814 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
 815 {
 816         struct macvlan_dev *vlan = netdev_priv(dev);
 817
 818         if (vlan->lowerdev->mtu < new_mtu)
 819                 return -EINVAL;
 820         dev->mtu = new_mtu;
 821         return 0;
 822 }
 823
 824 static int macvlan_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 825 {
 826         struct net_device *real_dev = macvlan_dev_real_dev(dev);
 827         const struct net_device_ops *ops = real_dev->netdev_ops;
 828         struct ifreq ifrr;
 829         int err = -EOPNOTSUPP;
 830
 831         strscpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
 832         ifrr.ifr_ifru = ifr->ifr_ifru;
 833
 834         switch (cmd) {
 835         case SIOCSHWTSTAMP:
 836                 if (!net_eq(dev_net(dev), &init_net))
 837                         break;
 838                 /* fall through */
 839         case SIOCGHWTSTAMP:
 840                 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
 841                         err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
 842                 break;
 843         }
 844
 845         if (!err)
 846                 ifr->ifr_ifru = ifrr.ifr_ifru;
 847
 848         return err;
 849 }
 850
 851 /*
 852  * macvlan network devices have devices nesting below it and are a special
 853  * "super class" of normal network devices; split their locks off into a
 854  * separate class since they always nest.
 855  */
 856 #define ALWAYS_ON_OFFLOADS \
 857         (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | \
 858          NETIF_F_GSO_ROBUST | NETIF_F_GSO_ENCAP_ALL)
 859
 860 #define ALWAYS_ON_FEATURES (ALWAYS_ON_OFFLOADS | NETIF_F_LLTX)
 861
 862 #define MACVLAN_FEATURES \
 863         (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
 864          NETIF_F_GSO | NETIF_F_TSO | NETIF_F_LRO | \
 865          NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
 866          NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
 867
 868 #define MACVLAN_STATE_MASK \
 869         ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
 870
 871 static int macvlan_init(struct net_device *dev)
 872 {
 873         struct macvlan_dev *vlan = netdev_priv(dev);
 874         const struct net_device *lowerdev = vlan->lowerdev;
 875         struct macvlan_port *port = vlan->port;
 876
 877         dev->state              = (dev->state & ~MACVLAN_STATE_MASK) |
 878                                   (lowerdev->state & MACVLAN_STATE_MASK);
 879         dev->features           = lowerdev->features & MACVLAN_FEATURES;
 880         dev->features           |= ALWAYS_ON_FEATURES;
 881         dev->hw_features        |= NETIF_F_LRO;
 882         dev->vlan_features      = lowerdev->vlan_features & MACVLAN_FEATURES;
 883         dev->vlan_features      |= ALWAYS_ON_OFFLOADS;
 884         dev->hw_enc_features    |= dev->features;
 885         dev->gso_max_size       = lowerdev->gso_max_size;
 886         dev->gso_max_segs       = lowerdev->gso_max_segs;
 887         dev->hard_header_len    = lowerdev->hard_header_len;
 888
 889         vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
 890         if (!vlan->pcpu_stats)
 891                 return -ENOMEM;
 892
 893         port->count += 1;
 894
 895         return 0;
 896 }
 897
 898 static void macvlan_uninit(struct net_device *dev)
 899 {
 900         struct macvlan_dev *vlan = netdev_priv(dev);
 901         struct macvlan_port *port = vlan->port;
 902
 903         free_percpu(vlan->pcpu_stats);
 904
 905         macvlan_flush_sources(port, vlan);
 906         port->count -= 1;
 907         if (!port->count)
 908                 macvlan_port_destroy(port->dev);
 909 }
 910
 911 static void macvlan_dev_get_stats64(struct net_device *dev,
 912                                     struct rtnl_link_stats64 *stats)
 913 {
 914         struct macvlan_dev *vlan = netdev_priv(dev);
 915
 916         if (vlan->pcpu_stats) {
 917                 struct vlan_pcpu_stats *p;
 918                 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
 919                 u32 rx_errors = 0, tx_dropped = 0;
 920                 unsigned int start;
 921                 int i;
 922
 923                 for_each_possible_cpu(i) {
 924                         p = per_cpu_ptr(vlan->pcpu_stats, i);
 925                         do {
 926                                 start = u64_stats_fetch_begin_irq(&p->syncp);
 927                                 rx_packets      = p->rx_packets;
 928                                 rx_bytes        = p->rx_bytes;
 929                                 rx_multicast    = p->rx_multicast;
 930                                 tx_packets      = p->tx_packets;
 931                                 tx_bytes        = p->tx_bytes;
 932                         } while (u64_stats_fetch_retry_irq(&p->syncp, start));
 933
 934                         stats->rx_packets       += rx_packets;
 935                         stats->rx_bytes         += rx_bytes;
 936                         stats->multicast        += rx_multicast;
 937                         stats->tx_packets       += tx_packets;
 938                         stats->tx_bytes         += tx_bytes;
 939                         /* rx_errors & tx_dropped are u32, updated
 940                          * without syncp protection.
 941                          */
 942                         rx_errors       += p->rx_errors;
 943                         tx_dropped      += p->tx_dropped;
 944                 }
 945                 stats->rx_errors        = rx_errors;
 946                 stats->rx_dropped       = rx_errors;
 947                 stats->tx_dropped       = tx_dropped;
 948         }
 949 }
 950
 951 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
 952                                    __be16 proto, u16 vid)
 953 {
 954         struct macvlan_dev *vlan = netdev_priv(dev);
 955         struct net_device *lowerdev = vlan->lowerdev;
 956
 957         return vlan_vid_add(lowerdev, proto, vid);
 958 }
 959
 960 static int macvlan_vlan_rx_kill_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         vlan_vid_del(lowerdev, proto, vid);
 967         return 0;
 968 }
 969
 970 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 971                            struct net_device *dev,
 972                            const unsigned char *addr, u16 vid,
 973                            u16 flags,
 974                            struct netlink_ext_ack *extack)
 975 {
 976         struct macvlan_dev *vlan = netdev_priv(dev);
 977         int err = -EINVAL;
 978
 979         /* Support unicast filter only on passthru devices.
 980          * Multicast filter should be allowed on all devices.
 981          */
 982         if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
 983                 return -EOPNOTSUPP;
 984
 985         if (flags & NLM_F_REPLACE)
 986                 return -EOPNOTSUPP;
 987
 988         if (is_unicast_ether_addr(addr))
 989                 err = dev_uc_add_excl(dev, addr);
 990         else if (is_multicast_ether_addr(addr))
 991                 err = dev_mc_add_excl(dev, addr);
 992
 993         return err;
 994 }
 995
 996 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
 997                            struct net_device *dev,
 998                            const unsigned char *addr, u16 vid)
 999 {
1000         struct macvlan_dev *vlan = netdev_priv(dev);
1001         int err = -EINVAL;
1002
1003         /* Support unicast filter only on passthru devices.
1004          * Multicast filter should be allowed on all devices.
1005          */
1006         if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
1007                 return -EOPNOTSUPP;
1008
1009         if (is_unicast_ether_addr(addr))
1010                 err = dev_uc_del(dev, addr);
1011         else if (is_multicast_ether_addr(addr))
1012                 err = dev_mc_del(dev, addr);
1013
1014         return err;
1015 }
1016
1017 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
1018                                         struct ethtool_drvinfo *drvinfo)
1019 {
1020         strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
1021         strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
1022 }
1023
1024 static int macvlan_ethtool_get_link_ksettings(struct net_device *dev,
1025                                               struct ethtool_link_ksettings *cmd)
1026 {
1027         const struct macvlan_dev *vlan = netdev_priv(dev);
1028
1029         return __ethtool_get_link_ksettings(vlan->lowerdev, cmd);
1030 }
1031
1032 static int macvlan_ethtool_get_ts_info(struct net_device *dev,
1033                                        struct ethtool_ts_info *info)
1034 {
1035         struct net_device *real_dev = macvlan_dev_real_dev(dev);
1036         const struct ethtool_ops *ops = real_dev->ethtool_ops;
1037         struct phy_device *phydev = real_dev->phydev;
1038
1039         if (phydev && phydev->drv && phydev->drv->ts_info) {
1040                  return phydev->drv->ts_info(phydev, info);
1041         } else if (ops->get_ts_info) {
1042                 return ops->get_ts_info(real_dev, info);
1043         } else {
1044                 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
1045                         SOF_TIMESTAMPING_SOFTWARE;
1046                 info->phc_index = -1;
1047         }
1048
1049         return 0;
1050 }
1051
1052 static netdev_features_t macvlan_fix_features(struct net_device *dev,
1053                                               netdev_features_t features)
1054 {
1055         struct macvlan_dev *vlan = netdev_priv(dev);
1056         netdev_features_t lowerdev_features = vlan->lowerdev->features;
1057         netdev_features_t mask;
1058
1059         features |= NETIF_F_ALL_FOR_ALL;
1060         features &= (vlan->set_features | ~MACVLAN_FEATURES);
1061         mask = features;
1062
1063         lowerdev_features &= (features | ~NETIF_F_LRO);
1064         features = netdev_increment_features(lowerdev_features, features, mask);
1065         features |= ALWAYS_ON_FEATURES;
1066         features &= (ALWAYS_ON_FEATURES | MACVLAN_FEATURES);
1067
1068         return features;
1069 }
1070
1071 #ifdef CONFIG_NET_POLL_CONTROLLER
1072 static void macvlan_dev_poll_controller(struct net_device *dev)
1073 {
1074         return;
1075 }
1076
1077 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
1078 {
1079         struct macvlan_dev *vlan = netdev_priv(dev);
1080         struct net_device *real_dev = vlan->lowerdev;
1081         struct netpoll *netpoll;
1082         int err = 0;
1083
1084         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
1085         err = -ENOMEM;
1086         if (!netpoll)
1087                 goto out;
1088
1089         err = __netpoll_setup(netpoll, real_dev);
1090         if (err) {
1091                 kfree(netpoll);
1092                 goto out;
1093         }
1094
1095         vlan->netpoll = netpoll;
1096
1097 out:
1098         return err;
1099 }
1100
1101 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
1102 {
1103         struct macvlan_dev *vlan = netdev_priv(dev);
1104         struct netpoll *netpoll = vlan->netpoll;
1105
1106         if (!netpoll)
1107                 return;
1108
1109         vlan->netpoll = NULL;
1110
1111         __netpoll_free(netpoll);
1112 }
1113 #endif  /* CONFIG_NET_POLL_CONTROLLER */
1114
1115 static int macvlan_dev_get_iflink(const struct net_device *dev)
1116 {
1117         struct macvlan_dev *vlan = netdev_priv(dev);
1118
1119         return vlan->lowerdev->ifindex;
1120 }
1121
1122 static const struct ethtool_ops macvlan_ethtool_ops = {
1123         .get_link               = ethtool_op_get_link,
1124         .get_link_ksettings     = macvlan_ethtool_get_link_ksettings,
1125         .get_drvinfo            = macvlan_ethtool_get_drvinfo,
1126         .get_ts_info            = macvlan_ethtool_get_ts_info,
1127 };
1128
1129 static const struct net_device_ops macvlan_netdev_ops = {
1130         .ndo_init               = macvlan_init,
1131         .ndo_uninit             = macvlan_uninit,
1132         .ndo_open               = macvlan_open,
1133         .ndo_stop               = macvlan_stop,
1134         .ndo_start_xmit         = macvlan_start_xmit,
1135         .ndo_change_mtu         = macvlan_change_mtu,
1136         .ndo_do_ioctl           = macvlan_do_ioctl,
1137         .ndo_fix_features       = macvlan_fix_features,
1138         .ndo_change_rx_flags    = macvlan_change_rx_flags,
1139         .ndo_set_mac_address    = macvlan_set_mac_address,
1140         .ndo_set_rx_mode        = macvlan_set_mac_lists,
1141         .ndo_get_stats64        = macvlan_dev_get_stats64,
1142         .ndo_validate_addr      = eth_validate_addr,
1143         .ndo_vlan_rx_add_vid    = macvlan_vlan_rx_add_vid,
1144         .ndo_vlan_rx_kill_vid   = macvlan_vlan_rx_kill_vid,
1145         .ndo_fdb_add            = macvlan_fdb_add,
1146         .ndo_fdb_del            = macvlan_fdb_del,
1147         .ndo_fdb_dump           = ndo_dflt_fdb_dump,
1148 #ifdef CONFIG_NET_POLL_CONTROLLER
1149         .ndo_poll_controller    = macvlan_dev_poll_controller,
1150         .ndo_netpoll_setup      = macvlan_dev_netpoll_setup,
1151         .ndo_netpoll_cleanup    = macvlan_dev_netpoll_cleanup,
1152 #endif
1153         .ndo_get_iflink         = macvlan_dev_get_iflink,
1154         .ndo_features_check     = passthru_features_check,
1155         .ndo_change_proto_down  = dev_change_proto_down_generic,
1156 };
1157
1158 void macvlan_common_setup(struct net_device *dev)
1159 {
1160         ether_setup(dev);
1161
1162         dev->min_mtu            = 0;
1163         dev->max_mtu            = ETH_MAX_MTU;
1164         dev->priv_flags        &= ~IFF_TX_SKB_SHARING;
1165         netif_keep_dst(dev);
1166         dev->priv_flags        |= IFF_UNICAST_FLT;
1167         dev->netdev_ops         = &macvlan_netdev_ops;
1168         dev->needs_free_netdev  = true;
1169         dev->header_ops         = &macvlan_hard_header_ops;
1170         dev->ethtool_ops        = &macvlan_ethtool_ops;
1171 }
1172 EXPORT_SYMBOL_GPL(macvlan_common_setup);
1173
1174 static void macvlan_setup(struct net_device *dev)
1175 {
1176         macvlan_common_setup(dev);
1177         dev->priv_flags |= IFF_NO_QUEUE;
1178 }
1179
1180 static int macvlan_port_create(struct net_device *dev)
1181 {
1182         struct macvlan_port *port;
1183         unsigned int i;
1184         int err;
1185
1186         if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1187                 return -EINVAL;
1188
1189         if (netdev_is_rx_handler_busy(dev))
1190                 return -EBUSY;
1191
1192         port = kzalloc(sizeof(*port), GFP_KERNEL);
1193         if (port == NULL)
1194                 return -ENOMEM;
1195
1196         port->dev = dev;
1197         ether_addr_copy(port->perm_addr, dev->dev_addr);
1198         INIT_LIST_HEAD(&port->vlans);
1199         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1200                 INIT_HLIST_HEAD(&port->vlan_hash[i]);
1201         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1202                 INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1203
1204         skb_queue_head_init(&port->bc_queue);
1205         INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1206
1207         err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1208         if (err)
1209                 kfree(port);
1210         else
1211                 dev->priv_flags |= IFF_MACVLAN_PORT;
1212         return err;
1213 }
1214
1215 static void macvlan_port_destroy(struct net_device *dev)
1216 {
1217         struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1218         struct sk_buff *skb;
1219
1220         dev->priv_flags &= ~IFF_MACVLAN_PORT;
1221         netdev_rx_handler_unregister(dev);
1222
1223         /* After this point, no packet can schedule bc_work anymore,
1224          * but we need to cancel it and purge left skbs if any.
1225          */
1226         cancel_work_sync(&port->bc_work);
1227
1228         while ((skb = __skb_dequeue(&port->bc_queue))) {
1229                 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
1230
1231                 if (src)
1232                         dev_put(src->dev);
1233
1234                 kfree_skb(skb);
1235         }
1236
1237         /* If the lower device address has been changed by passthru
1238          * macvlan, put it back.
1239          */
1240         if (macvlan_passthru(port) &&
1241             !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) {
1242                 struct sockaddr sa;
1243
1244                 sa.sa_family = port->dev->type;
1245                 memcpy(&sa.sa_data, port->perm_addr, port->dev->addr_len);
1246                 dev_set_mac_address(port->dev, &sa, NULL);
1247         }
1248
1249         kfree(port);
1250 }
1251
1252 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[],
1253                             struct netlink_ext_ack *extack)
1254 {
1255         if (tb[IFLA_ADDRESS]) {
1256                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1257                         return -EINVAL;
1258                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1259                         return -EADDRNOTAVAIL;
1260         }
1261
1262         if (!data)
1263                 return 0;
1264
1265         if (data[IFLA_MACVLAN_FLAGS] &&
1266             nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
1267                 return -EINVAL;
1268
1269         if (data[IFLA_MACVLAN_MODE]) {
1270                 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1271                 case MACVLAN_MODE_PRIVATE:
1272                 case MACVLAN_MODE_VEPA:
1273                 case MACVLAN_MODE_BRIDGE:
1274                 case MACVLAN_MODE_PASSTHRU:
1275                 case MACVLAN_MODE_SOURCE:
1276                         break;
1277                 default:
1278                         return -EINVAL;
1279                 }
1280         }
1281
1282         if (data[IFLA_MACVLAN_MACADDR_MODE]) {
1283                 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1284                 case MACVLAN_MACADDR_ADD:
1285                 case MACVLAN_MACADDR_DEL:
1286                 case MACVLAN_MACADDR_FLUSH:
1287                 case MACVLAN_MACADDR_SET:
1288                         break;
1289                 default:
1290                         return -EINVAL;
1291                 }
1292         }
1293
1294         if (data[IFLA_MACVLAN_MACADDR]) {
1295                 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1296                         return -EINVAL;
1297
1298                 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1299                         return -EADDRNOTAVAIL;
1300         }
1301
1302         if (data[IFLA_MACVLAN_MACADDR_COUNT])
1303                 return -EINVAL;
1304
1305         return 0;
1306 }
1307
1308 /**
1309  * reconfigure list of remote source mac address
1310  * (only for macvlan devices in source mode)
1311  * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1312  * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1313  */
1314 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1315                                       struct nlattr *data[])
1316 {
1317         char *addr = NULL;
1318         int ret, rem, len;
1319         struct nlattr *nla, *head;
1320         struct macvlan_source_entry *entry;
1321
1322         if (data[IFLA_MACVLAN_MACADDR])
1323                 addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1324
1325         if (mode == MACVLAN_MACADDR_ADD) {
1326                 if (!addr)
1327                         return -EINVAL;
1328
1329                 return macvlan_hash_add_source(vlan, addr);
1330
1331         } else if (mode == MACVLAN_MACADDR_DEL) {
1332                 if (!addr)
1333                         return -EINVAL;
1334
1335                 entry = macvlan_hash_lookup_source(vlan, addr);
1336                 if (entry) {
1337                         macvlan_hash_del_source(entry);
1338                         vlan->macaddr_count--;
1339                 }
1340         } else if (mode == MACVLAN_MACADDR_FLUSH) {
1341                 macvlan_flush_sources(vlan->port, vlan);
1342         } else if (mode == MACVLAN_MACADDR_SET) {
1343                 macvlan_flush_sources(vlan->port, vlan);
1344
1345                 if (addr) {
1346                         ret = macvlan_hash_add_source(vlan, addr);
1347                         if (ret)
1348                                 return ret;
1349                 }
1350
1351                 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA])
1352                         return 0;
1353
1354                 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1355                 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1356
1357                 nla_for_each_attr(nla, head, len, rem) {
1358                         if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1359                             nla_len(nla) != ETH_ALEN)
1360                                 continue;
1361
1362                         addr = nla_data(nla);
1363                         ret = macvlan_hash_add_source(vlan, addr);
1364                         if (ret)
1365                                 return ret;
1366                 }
1367         } else {
1368                 return -EINVAL;
1369         }
1370
1371         return 0;
1372 }
1373
1374 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1375                            struct nlattr *tb[], struct nlattr *data[],
1376                            struct netlink_ext_ack *extack)
1377 {
1378         struct macvlan_dev *vlan = netdev_priv(dev);
1379         struct macvlan_port *port;
1380         struct net_device *lowerdev;
1381         int err;
1382         int macmode;
1383         bool create = false;
1384
1385         if (!tb[IFLA_LINK])
1386                 return -EINVAL;
1387
1388         lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1389         if (lowerdev == NULL)
1390                 return -ENODEV;
1391
1392         /* When creating macvlans or macvtaps on top of other macvlans - use
1393          * the real device as the lowerdev.
1394          */
1395         if (netif_is_macvlan(lowerdev))
1396                 lowerdev = macvlan_dev_real_dev(lowerdev);
1397
1398         if (!tb[IFLA_MTU])
1399                 dev->mtu = lowerdev->mtu;
1400         else if (dev->mtu > lowerdev->mtu)
1401                 return -EINVAL;
1402
1403         /* MTU range: 68 - lowerdev->max_mtu */
1404         dev->min_mtu = ETH_MIN_MTU;
1405         dev->max_mtu = lowerdev->max_mtu;
1406
1407         if (!tb[IFLA_ADDRESS])
1408                 eth_hw_addr_random(dev);
1409
1410         if (!netif_is_macvlan_port(lowerdev)) {
1411                 err = macvlan_port_create(lowerdev);
1412                 if (err < 0)
1413                         return err;
1414                 create = true;
1415         }
1416         port = macvlan_port_get_rtnl(lowerdev);
1417
1418         /* Only 1 macvlan device can be created in passthru mode */
1419         if (macvlan_passthru(port)) {
1420                 /* The macvlan port must be not created this time,
1421                  * still goto destroy_macvlan_port for readability.
1422                  */
1423                 err = -EINVAL;
1424                 goto destroy_macvlan_port;
1425         }
1426
1427         vlan->lowerdev = lowerdev;
1428         vlan->dev      = dev;
1429         vlan->port     = port;
1430         vlan->set_features = MACVLAN_FEATURES;
1431
1432         vlan->mode     = MACVLAN_MODE_VEPA;
1433         if (data && data[IFLA_MACVLAN_MODE])
1434                 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1435
1436         if (data && data[IFLA_MACVLAN_FLAGS])
1437                 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1438
1439         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1440                 if (port->count) {
1441                         err = -EINVAL;
1442                         goto destroy_macvlan_port;
1443                 }
1444                 macvlan_set_passthru(port);
1445                 eth_hw_addr_inherit(dev, lowerdev);
1446         }
1447
1448         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1449                 if (vlan->mode != MACVLAN_MODE_SOURCE) {
1450                         err = -EINVAL;
1451                         goto destroy_macvlan_port;
1452                 }
1453                 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1454                 err = macvlan_changelink_sources(vlan, macmode, data);
1455                 if (err)
1456                         goto destroy_macvlan_port;
1457         }
1458
1459         err = register_netdevice(dev);
1460         if (err < 0)
1461                 goto destroy_macvlan_port;
1462
1463         dev->priv_flags |= IFF_MACVLAN;
1464         err = netdev_upper_dev_link(lowerdev, dev, extack);
1465         if (err)
1466                 goto unregister_netdev;
1467
1468         list_add_tail_rcu(&vlan->list, &port->vlans);
1469         netif_stacked_transfer_operstate(lowerdev, dev);
1470         linkwatch_fire_event(dev);
1471
1472         return 0;
1473
1474 unregister_netdev:
1475         /* macvlan_uninit would free the macvlan port */
1476         unregister_netdevice(dev);
1477         return err;
1478 destroy_macvlan_port:
1479         /* the macvlan port may be freed by macvlan_uninit when fail to register.
1480          * so we destroy the macvlan port only when it's valid.
1481          */
1482         if (create && macvlan_port_get_rtnl(lowerdev))
1483                 macvlan_port_destroy(port->dev);
1484         return err;
1485 }
1486 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1487
1488 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1489                            struct nlattr *tb[], struct nlattr *data[],
1490                            struct netlink_ext_ack *extack)
1491 {
1492         return macvlan_common_newlink(src_net, dev, tb, data, extack);
1493 }
1494
1495 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1496 {
1497         struct macvlan_dev *vlan = netdev_priv(dev);
1498
1499         if (vlan->mode == MACVLAN_MODE_SOURCE)
1500                 macvlan_flush_sources(vlan->port, vlan);
1501         list_del_rcu(&vlan->list);
1502         unregister_netdevice_queue(dev, head);
1503         netdev_upper_dev_unlink(vlan->lowerdev, dev);
1504 }
1505 EXPORT_SYMBOL_GPL(macvlan_dellink);
1506
1507 static int macvlan_changelink(struct net_device *dev,
1508                               struct nlattr *tb[], struct nlattr *data[],
1509                               struct netlink_ext_ack *extack)
1510 {
1511         struct macvlan_dev *vlan = netdev_priv(dev);
1512         enum macvlan_mode mode;
1513         bool set_mode = false;
1514         enum macvlan_macaddr_mode macmode;
1515         int ret;
1516
1517         /* Validate mode, but don't set yet: setting flags may fail. */
1518         if (data && data[IFLA_MACVLAN_MODE]) {
1519                 set_mode = true;
1520                 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1521                 /* Passthrough mode can't be set or cleared dynamically */
1522                 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1523                     (vlan->mode == MACVLAN_MODE_PASSTHRU))
1524                         return -EINVAL;
1525                 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1526                     vlan->mode != mode)
1527                         macvlan_flush_sources(vlan->port, vlan);
1528         }
1529
1530         if (data && data[IFLA_MACVLAN_FLAGS]) {
1531                 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1532                 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1533                 if (macvlan_passthru(vlan->port) && promisc) {
1534                         int err;
1535
1536                         if (flags & MACVLAN_FLAG_NOPROMISC)
1537                                 err = dev_set_promiscuity(vlan->lowerdev, -1);
1538                         else
1539                                 err = dev_set_promiscuity(vlan->lowerdev, 1);
1540                         if (err < 0)
1541                                 return err;
1542                 }
1543                 vlan->flags = flags;
1544         }
1545         if (set_mode)
1546                 vlan->mode = mode;
1547         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1548                 if (vlan->mode != MACVLAN_MODE_SOURCE)
1549                         return -EINVAL;
1550                 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1551                 ret = macvlan_changelink_sources(vlan, macmode, data);
1552                 if (ret)
1553                         return ret;
1554         }
1555         return 0;
1556 }
1557
1558 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1559 {
1560         if (vlan->macaddr_count == 0)
1561                 return 0;
1562         return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1563                 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1564 }
1565
1566 static size_t macvlan_get_size(const struct net_device *dev)
1567 {
1568         struct macvlan_dev *vlan = netdev_priv(dev);
1569
1570         return (0
1571                 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1572                 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1573                 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1574                 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1575                 );
1576 }
1577
1578 static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1579                                      const struct macvlan_dev *vlan,
1580                                      const int i)
1581 {
1582         struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1583         struct macvlan_source_entry *entry;
1584
1585         hlist_for_each_entry_rcu(entry, h, hlist) {
1586                 if (entry->vlan != vlan)
1587                         continue;
1588                 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1589                         return 1;
1590         }
1591         return 0;
1592 }
1593
1594 static int macvlan_fill_info(struct sk_buff *skb,
1595                                 const struct net_device *dev)
1596 {
1597         struct macvlan_dev *vlan = netdev_priv(dev);
1598         int i;
1599         struct nlattr *nest;
1600
1601         if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1602                 goto nla_put_failure;
1603         if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1604                 goto nla_put_failure;
1605         if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1606                 goto nla_put_failure;
1607         if (vlan->macaddr_count > 0) {
1608                 nest = nla_nest_start_noflag(skb, IFLA_MACVLAN_MACADDR_DATA);
1609                 if (nest == NULL)
1610                         goto nla_put_failure;
1611
1612                 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1613                         if (macvlan_fill_info_macaddr(skb, vlan, i))
1614                                 goto nla_put_failure;
1615                 }
1616                 nla_nest_end(skb, nest);
1617         }
1618         return 0;
1619
1620 nla_put_failure:
1621         return -EMSGSIZE;
1622 }
1623
1624 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1625         [IFLA_MACVLAN_MODE]  = { .type = NLA_U32 },
1626         [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1627         [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1628         [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1629         [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1630         [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1631 };
1632
1633 int macvlan_link_register(struct rtnl_link_ops *ops)
1634 {
1635         /* common fields */
1636         ops->validate           = macvlan_validate;
1637         ops->maxtype            = IFLA_MACVLAN_MAX;
1638         ops->policy             = macvlan_policy;
1639         ops->changelink         = macvlan_changelink;
1640         ops->get_size           = macvlan_get_size;
1641         ops->fill_info          = macvlan_fill_info;
1642
1643         return rtnl_link_register(ops);
1644 };
1645 EXPORT_SYMBOL_GPL(macvlan_link_register);
1646
1647 static struct net *macvlan_get_link_net(const struct net_device *dev)
1648 {
1649         return dev_net(macvlan_dev_real_dev(dev));
1650 }
1651
1652 static struct rtnl_link_ops macvlan_link_ops = {
1653         .kind           = "macvlan",
1654         .setup          = macvlan_setup,
1655         .newlink        = macvlan_newlink,
1656         .dellink        = macvlan_dellink,
1657         .get_link_net   = macvlan_get_link_net,
1658         .priv_size      = sizeof(struct macvlan_dev),
1659 };
1660
1661 static int macvlan_device_event(struct notifier_block *unused,
1662                                 unsigned long event, void *ptr)
1663 {
1664         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1665         struct macvlan_dev *vlan, *next;
1666         struct macvlan_port *port;
1667         LIST_HEAD(list_kill);
1668
1669         if (!netif_is_macvlan_port(dev))
1670                 return NOTIFY_DONE;
1671
1672         port = macvlan_port_get_rtnl(dev);
1673
1674         switch (event) {
1675         case NETDEV_UP:
1676         case NETDEV_DOWN:
1677         case NETDEV_CHANGE:
1678                 list_for_each_entry(vlan, &port->vlans, list)
1679                         netif_stacked_transfer_operstate(vlan->lowerdev,
1680                                                          vlan->dev);
1681                 break;
1682         case NETDEV_FEAT_CHANGE:
1683                 list_for_each_entry(vlan, &port->vlans, list) {
1684                         vlan->dev->gso_max_size = dev->gso_max_size;
1685                         vlan->dev->gso_max_segs = dev->gso_max_segs;
1686                         netdev_update_features(vlan->dev);
1687                 }
1688                 break;
1689         case NETDEV_CHANGEMTU:
1690                 list_for_each_entry(vlan, &port->vlans, list) {
1691                         if (vlan->dev->mtu <= dev->mtu)
1692                                 continue;
1693                         dev_set_mtu(vlan->dev, dev->mtu);
1694                 }
1695                 break;
1696         case NETDEV_CHANGEADDR:
1697                 if (!macvlan_passthru(port))
1698                         return NOTIFY_DONE;
1699
1700                 vlan = list_first_entry_or_null(&port->vlans,
1701                                                 struct macvlan_dev,
1702                                                 list);
1703
1704                 if (macvlan_sync_address(vlan->dev, dev->dev_addr))
1705                         return NOTIFY_BAD;
1706
1707                 break;
1708         case NETDEV_UNREGISTER:
1709                 /* twiddle thumbs on netns device moves */
1710                 if (dev->reg_state != NETREG_UNREGISTERING)
1711                         break;
1712
1713                 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1714                         vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1715                 unregister_netdevice_many(&list_kill);
1716                 break;
1717         case NETDEV_PRE_TYPE_CHANGE:
1718                 /* Forbid underlaying device to change its type. */
1719                 return NOTIFY_BAD;
1720
1721         case NETDEV_NOTIFY_PEERS:
1722         case NETDEV_BONDING_FAILOVER:
1723         case NETDEV_RESEND_IGMP:
1724                 /* Propagate to all vlans */
1725                 list_for_each_entry(vlan, &port->vlans, list)
1726                         call_netdevice_notifiers(event, vlan->dev);
1727         }
1728         return NOTIFY_DONE;
1729 }
1730
1731 static struct notifier_block macvlan_notifier_block __read_mostly = {
1732         .notifier_call  = macvlan_device_event,
1733 };
1734
1735 static int __init macvlan_init_module(void)
1736 {
1737         int err;
1738
1739         register_netdevice_notifier(&macvlan_notifier_block);
1740
1741         err = macvlan_link_register(&macvlan_link_ops);
1742         if (err < 0)
1743                 goto err1;
1744         return 0;
1745 err1:
1746         unregister_netdevice_notifier(&macvlan_notifier_block);
1747         return err;
1748 }
1749
1750 static void __exit macvlan_cleanup_module(void)
1751 {
1752         rtnl_link_unregister(&macvlan_link_ops);
1753         unregister_netdevice_notifier(&macvlan_notifier_block);
1754 }
1755
1756 module_init(macvlan_init_module);
1757 module_exit(macvlan_cleanup_module);
1758
1759 MODULE_LICENSE("GPL");
1760 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1761 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1762 MODULE_ALIAS_RTNL_LINK("macvlan");