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         if (err)
 363                 goto free_nskb;
 364
 365         schedule_work(&port->bc_work);
 366         return;
 367
 368 free_nskb:
 369         kfree_skb(nskb);
 370 err:
 371         atomic_long_inc(&skb->dev->rx_dropped);
 372 }
 373
 374 static void macvlan_flush_sources(struct macvlan_port *port,
 375                                   struct macvlan_dev *vlan)
 376 {
 377         int i;
 378
 379         for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
 380                 struct hlist_node *h, *n;
 381
 382                 hlist_for_each_safe(h, n, &port->vlan_source_hash[i]) {
 383                         struct macvlan_source_entry *entry;
 384
 385                         entry = hlist_entry(h, struct macvlan_source_entry,
 386                                             hlist);
 387                         if (entry->vlan == vlan)
 388                                 macvlan_hash_del_source(entry);
 389                 }
 390         }
 391         vlan->macaddr_count = 0;
 392 }
 393
 394 static void macvlan_forward_source_one(struct sk_buff *skb,
 395                                        struct macvlan_dev *vlan)
 396 {
 397         struct sk_buff *nskb;
 398         struct net_device *dev;
 399         int len;
 400         int ret;
 401
 402         dev = vlan->dev;
 403         if (unlikely(!(dev->flags & IFF_UP)))
 404                 return;
 405
 406         nskb = skb_clone(skb, GFP_ATOMIC);
 407         if (!nskb)
 408                 return;
 409
 410         len = nskb->len + ETH_HLEN;
 411         nskb->dev = dev;
 412
 413         if (ether_addr_equal_64bits(eth_hdr(skb)->h_dest, dev->dev_addr))
 414                 nskb->pkt_type = PACKET_HOST;
 415
 416         ret = netif_rx(nskb);
 417         macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
 418 }
 419
 420 static void macvlan_forward_source(struct sk_buff *skb,
 421                                    struct macvlan_port *port,
 422                                    const unsigned char *addr)
 423 {
 424         struct macvlan_source_entry *entry;
 425         u32 idx = macvlan_eth_hash(addr);
 426         struct hlist_head *h = &port->vlan_source_hash[idx];
 427
 428         hlist_for_each_entry_rcu(entry, h, hlist) {
 429                 if (ether_addr_equal_64bits(entry->addr, addr))
 430                         macvlan_forward_source_one(skb, entry->vlan);
 431         }
 432 }
 433
 434 /* called under rcu_read_lock() from netif_receive_skb */
 435 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
 436 {
 437         struct macvlan_port *port;
 438         struct sk_buff *skb = *pskb;
 439         const struct ethhdr *eth = eth_hdr(skb);
 440         const struct macvlan_dev *vlan;
 441         const struct macvlan_dev *src;
 442         struct net_device *dev;
 443         unsigned int len = 0;
 444         int ret;
 445         rx_handler_result_t handle_res;
 446
 447         port = macvlan_port_get_rcu(skb->dev);
 448         if (is_multicast_ether_addr(eth->h_dest)) {
 449                 unsigned int hash;
 450
 451                 skb = ip_check_defrag(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN);
 452                 if (!skb)
 453                         return RX_HANDLER_CONSUMED;
 454                 *pskb = skb;
 455                 eth = eth_hdr(skb);
 456                 macvlan_forward_source(skb, port, eth->h_source);
 457                 src = macvlan_hash_lookup(port, eth->h_source);
 458                 if (src && src->mode != MACVLAN_MODE_VEPA &&
 459                     src->mode != MACVLAN_MODE_BRIDGE) {
 460                         /* forward to original port. */
 461                         vlan = src;
 462                         ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
 463                               netif_rx(skb);
 464                         handle_res = RX_HANDLER_CONSUMED;
 465                         goto out;
 466                 }
 467
 468                 hash = mc_hash(NULL, eth->h_dest);
 469                 if (test_bit(hash, port->mc_filter))
 470                         macvlan_broadcast_enqueue(port, src, skb);
 471
 472                 return RX_HANDLER_PASS;
 473         }
 474
 475         macvlan_forward_source(skb, port, eth->h_source);
 476         if (macvlan_passthru(port))
 477                 vlan = list_first_or_null_rcu(&port->vlans,
 478                                               struct macvlan_dev, list);
 479         else
 480                 vlan = macvlan_hash_lookup(port, eth->h_dest);
 481         if (!vlan || vlan->mode == MACVLAN_MODE_SOURCE)
 482                 return RX_HANDLER_PASS;
 483
 484         dev = vlan->dev;
 485         if (unlikely(!(dev->flags & IFF_UP))) {
 486                 kfree_skb(skb);
 487                 return RX_HANDLER_CONSUMED;
 488         }
 489         len = skb->len + ETH_HLEN;
 490         skb = skb_share_check(skb, GFP_ATOMIC);
 491         if (!skb) {
 492                 ret = NET_RX_DROP;
 493                 handle_res = RX_HANDLER_CONSUMED;
 494                 goto out;
 495         }
 496
 497         *pskb = skb;
 498         skb->dev = dev;
 499         skb->pkt_type = PACKET_HOST;
 500
 501         ret = NET_RX_SUCCESS;
 502         handle_res = RX_HANDLER_ANOTHER;
 503 out:
 504         macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
 505         return handle_res;
 506 }
 507
 508 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
 509 {
 510         const struct macvlan_dev *vlan = netdev_priv(dev);
 511         const struct macvlan_port *port = vlan->port;
 512         const struct macvlan_dev *dest;
 513
 514         if (vlan->mode == MACVLAN_MODE_BRIDGE) {
 515                 const struct ethhdr *eth = (void *)skb->data;
 516
 517                 /* send to other bridge ports directly */
 518                 if (is_multicast_ether_addr(eth->h_dest)) {
 519                         macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
 520                         goto xmit_world;
 521                 }
 522
 523                 dest = macvlan_hash_lookup(port, eth->h_dest);
 524                 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
 525                         /* send to lowerdev first for its network taps */
 526                         dev_forward_skb(vlan->lowerdev, skb);
 527
 528                         return NET_XMIT_SUCCESS;
 529                 }
 530         }
 531 xmit_world:
 532         skb->dev = vlan->lowerdev;
 533         return dev_queue_xmit_accel(skb,
 534                                     netdev_get_sb_channel(dev) ? dev : NULL);
 535 }
 536
 537 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
 538 {
 539 #ifdef CONFIG_NET_POLL_CONTROLLER
 540         if (vlan->netpoll)
 541                 netpoll_send_skb(vlan->netpoll, skb);
 542 #else
 543         BUG();
 544 #endif
 545         return NETDEV_TX_OK;
 546 }
 547
 548 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
 549                                       struct net_device *dev)
 550 {
 551         struct macvlan_dev *vlan = netdev_priv(dev);
 552         unsigned int len = skb->len;
 553         int ret;
 554
 555         if (unlikely(netpoll_tx_running(dev)))
 556                 return macvlan_netpoll_send_skb(vlan, skb);
 557
 558         ret = macvlan_queue_xmit(skb, dev);
 559
 560         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 561                 struct vlan_pcpu_stats *pcpu_stats;
 562
 563                 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
 564                 u64_stats_update_begin(&pcpu_stats->syncp);
 565                 pcpu_stats->tx_packets++;
 566                 pcpu_stats->tx_bytes += len;
 567                 u64_stats_update_end(&pcpu_stats->syncp);
 568         } else {
 569                 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
 570         }
 571         return ret;
 572 }
 573
 574 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
 575                                unsigned short type, const void *daddr,
 576                                const void *saddr, unsigned len)
 577 {
 578         const struct macvlan_dev *vlan = netdev_priv(dev);
 579         struct net_device *lowerdev = vlan->lowerdev;
 580
 581         return dev_hard_header(skb, lowerdev, type, daddr,
 582                                saddr ? : dev->dev_addr, len);
 583 }
 584
 585 static const struct header_ops macvlan_hard_header_ops = {
 586         .create         = macvlan_hard_header,
 587         .parse          = eth_header_parse,
 588         .cache          = eth_header_cache,
 589         .cache_update   = eth_header_cache_update,
 590 };
 591
 592 static int macvlan_open(struct net_device *dev)
 593 {
 594         struct macvlan_dev *vlan = netdev_priv(dev);
 595         struct net_device *lowerdev = vlan->lowerdev;
 596         int err;
 597
 598         if (macvlan_passthru(vlan->port)) {
 599                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
 600                         err = dev_set_promiscuity(lowerdev, 1);
 601                         if (err < 0)
 602                                 goto out;
 603                 }
 604                 goto hash_add;
 605         }
 606
 607         err = -EADDRINUSE;
 608         if (macvlan_addr_busy(vlan->port, dev->dev_addr))
 609                 goto out;
 610
 611         /* Attempt to populate accel_priv which is used to offload the L2
 612          * forwarding requests for unicast packets.
 613          */
 614         if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD)
 615                 vlan->accel_priv =
 616                       lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
 617
 618         /* If earlier attempt to offload failed, or accel_priv is not
 619          * populated we must add the unicast address to the lower device.
 620          */
 621         if (IS_ERR_OR_NULL(vlan->accel_priv)) {
 622                 vlan->accel_priv = NULL;
 623                 err = dev_uc_add(lowerdev, dev->dev_addr);
 624                 if (err < 0)
 625                         goto out;
 626         }
 627
 628         if (dev->flags & IFF_ALLMULTI) {
 629                 err = dev_set_allmulti(lowerdev, 1);
 630                 if (err < 0)
 631                         goto del_unicast;
 632         }
 633
 634         if (dev->flags & IFF_PROMISC) {
 635                 err = dev_set_promiscuity(lowerdev, 1);
 636                 if (err < 0)
 637                         goto clear_multi;
 638         }
 639
 640 hash_add:
 641         macvlan_hash_add(vlan);
 642         return 0;
 643
 644 clear_multi:
 645         if (dev->flags & IFF_ALLMULTI)
 646                 dev_set_allmulti(lowerdev, -1);
 647 del_unicast:
 648         if (vlan->accel_priv) {
 649                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
 650                                                            vlan->accel_priv);
 651                 vlan->accel_priv = NULL;
 652         } else {
 653                 dev_uc_del(lowerdev, dev->dev_addr);
 654         }
 655 out:
 656         return err;
 657 }
 658
 659 static int macvlan_stop(struct net_device *dev)
 660 {
 661         struct macvlan_dev *vlan = netdev_priv(dev);
 662         struct net_device *lowerdev = vlan->lowerdev;
 663
 664         if (vlan->accel_priv) {
 665                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
 666                                                            vlan->accel_priv);
 667                 vlan->accel_priv = NULL;
 668         }
 669
 670         dev_uc_unsync(lowerdev, dev);
 671         dev_mc_unsync(lowerdev, dev);
 672
 673         if (macvlan_passthru(vlan->port)) {
 674                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
 675                         dev_set_promiscuity(lowerdev, -1);
 676                 goto hash_del;
 677         }
 678
 679         if (dev->flags & IFF_ALLMULTI)
 680                 dev_set_allmulti(lowerdev, -1);
 681
 682         if (dev->flags & IFF_PROMISC)
 683                 dev_set_promiscuity(lowerdev, -1);
 684
 685         dev_uc_del(lowerdev, dev->dev_addr);
 686
 687 hash_del:
 688         macvlan_hash_del(vlan, !dev->dismantle);
 689         return 0;
 690 }
 691
 692 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
 693 {
 694         struct macvlan_dev *vlan = netdev_priv(dev);
 695         struct net_device *lowerdev = vlan->lowerdev;
 696         struct macvlan_port *port = vlan->port;
 697         int err;
 698
 699         if (!(dev->flags & IFF_UP)) {
 700                 /* Just copy in the new address */
 701                 ether_addr_copy(dev->dev_addr, addr);
 702         } else {
 703                 /* Rehash and update the device filters */
 704                 if (macvlan_addr_busy(vlan->port, addr))
 705                         return -EADDRINUSE;
 706
 707                 if (!macvlan_passthru(port)) {
 708                         err = dev_uc_add(lowerdev, addr);
 709                         if (err)
 710                                 return err;
 711
 712                         dev_uc_del(lowerdev, dev->dev_addr);
 713                 }
 714
 715                 macvlan_hash_change_addr(vlan, addr);
 716         }
 717         if (macvlan_passthru(port) && !macvlan_addr_change(port)) {
 718                 /* Since addr_change isn't set, we are here due to lower
 719                  * device change.  Save the lower-dev address so we can
 720                  * restore it later.
 721                  */
 722                 ether_addr_copy(vlan->port->perm_addr,
 723                                 lowerdev->dev_addr);
 724         }
 725         macvlan_clear_addr_change(port);
 726         return 0;
 727 }
 728
 729 static int macvlan_set_mac_address(struct net_device *dev, void *p)
 730 {
 731         struct macvlan_dev *vlan = netdev_priv(dev);
 732         struct sockaddr *addr = p;
 733
 734         if (!is_valid_ether_addr(addr->sa_data))
 735                 return -EADDRNOTAVAIL;
 736
 737         /* If the addresses are the same, this is a no-op */
 738         if (ether_addr_equal(dev->dev_addr, addr->sa_data))
 739                 return 0;
 740
 741         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
 742                 macvlan_set_addr_change(vlan->port);
 743                 return dev_set_mac_address(vlan->lowerdev, addr, NULL);
 744         }
 745
 746         if (macvlan_addr_busy(vlan->port, addr->sa_data))
 747                 return -EADDRINUSE;
 748
 749         return macvlan_sync_address(dev, addr->sa_data);
 750 }
 751
 752 static void macvlan_change_rx_flags(struct net_device *dev, int change)
 753 {
 754         struct macvlan_dev *vlan = netdev_priv(dev);
 755         struct net_device *lowerdev = vlan->lowerdev;
 756
 757         if (dev->flags & IFF_UP) {
 758                 if (change & IFF_ALLMULTI)
 759                         dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 760                 if (change & IFF_PROMISC)
 761                         dev_set_promiscuity(lowerdev,
 762                                             dev->flags & IFF_PROMISC ? 1 : -1);
 763
 764         }
 765 }
 766
 767 static void macvlan_compute_filter(unsigned long *mc_filter,
 768                                    struct net_device *dev,
 769                                    struct macvlan_dev *vlan)
 770 {
 771         if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
 772                 bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ);
 773         } else {
 774                 struct netdev_hw_addr *ha;
 775                 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
 776
 777                 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
 778                 netdev_for_each_mc_addr(ha, dev) {
 779                         __set_bit(mc_hash(vlan, ha->addr), filter);
 780                 }
 781
 782                 __set_bit(mc_hash(vlan, dev->broadcast), filter);
 783
 784                 bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ);
 785         }
 786 }
 787
 788 static void macvlan_set_mac_lists(struct net_device *dev)
 789 {
 790         struct macvlan_dev *vlan = netdev_priv(dev);
 791
 792         macvlan_compute_filter(vlan->mc_filter, dev, vlan);
 793
 794         dev_uc_sync(vlan->lowerdev, dev);
 795         dev_mc_sync(vlan->lowerdev, dev);
 796
 797         /* This is slightly inaccurate as we're including the subscription
 798          * list of vlan->lowerdev too.
 799          *
 800          * Bug alert: This only works if everyone has the same broadcast
 801          * address as lowerdev.  As soon as someone changes theirs this
 802          * will break.
 803          *
 804          * However, this is already broken as when you change your broadcast
 805          * address we don't get called.
 806          *
 807          * The solution is to maintain a list of broadcast addresses like
 808          * we do for uc/mc, if you care.
 809          */
 810         macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL);
 811 }
 812
 813 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
 814 {
 815         struct macvlan_dev *vlan = netdev_priv(dev);
 816
 817         if (vlan->lowerdev->mtu < new_mtu)
 818                 return -EINVAL;
 819         dev->mtu = new_mtu;
 820         return 0;
 821 }
 822
 823 static int macvlan_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 824 {
 825         struct net_device *real_dev = macvlan_dev_real_dev(dev);
 826         const struct net_device_ops *ops = real_dev->netdev_ops;
 827         struct ifreq ifrr;
 828         int err = -EOPNOTSUPP;
 829
 830         strscpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
 831         ifrr.ifr_ifru = ifr->ifr_ifru;
 832
 833         switch (cmd) {
 834         case SIOCSHWTSTAMP:
 835                 if (!net_eq(dev_net(dev), &init_net))
 836                         break;
 837                 /* fall through */
 838         case SIOCGHWTSTAMP:
 839                 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
 840                         err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
 841                 break;
 842         }
 843
 844         if (!err)
 845                 ifr->ifr_ifru = ifrr.ifr_ifru;
 846
 847         return err;
 848 }
 849
 850 /*
 851  * macvlan network devices have devices nesting below it and are a special
 852  * "super class" of normal network devices; split their locks off into a
 853  * separate class since they always nest.
 854  */
 855 static struct lock_class_key macvlan_netdev_addr_lock_key;
 856
 857 #define ALWAYS_ON_OFFLOADS \
 858         (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | \
 859          NETIF_F_GSO_ROBUST | NETIF_F_GSO_ENCAP_ALL)
 860
 861 #define ALWAYS_ON_FEATURES (ALWAYS_ON_OFFLOADS | NETIF_F_LLTX)
 862
 863 #define MACVLAN_FEATURES \
 864         (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
 865          NETIF_F_GSO | NETIF_F_TSO | NETIF_F_LRO | \
 866          NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
 867          NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
 868
 869 #define MACVLAN_STATE_MASK \
 870         ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
 871
 872 static int macvlan_get_nest_level(struct net_device *dev)
 873 {
 874         return ((struct macvlan_dev *)netdev_priv(dev))->nest_level;
 875 }
 876
 877 static void macvlan_set_lockdep_class(struct net_device *dev)
 878 {
 879         netdev_lockdep_set_classes(dev);
 880         lockdep_set_class_and_subclass(&dev->addr_list_lock,
 881                                        &macvlan_netdev_addr_lock_key,
 882                                        macvlan_get_nest_level(dev));
 883 }
 884
 885 static int macvlan_init(struct net_device *dev)
 886 {
 887         struct macvlan_dev *vlan = netdev_priv(dev);
 888         const struct net_device *lowerdev = vlan->lowerdev;
 889         struct macvlan_port *port = vlan->port;
 890
 891         dev->state              = (dev->state & ~MACVLAN_STATE_MASK) |
 892                                   (lowerdev->state & MACVLAN_STATE_MASK);
 893         dev->features           = lowerdev->features & MACVLAN_FEATURES;
 894         dev->features           |= ALWAYS_ON_FEATURES;
 895         dev->hw_features        |= NETIF_F_LRO;
 896         dev->vlan_features      = lowerdev->vlan_features & MACVLAN_FEATURES;
 897         dev->vlan_features      |= ALWAYS_ON_OFFLOADS;
 898         dev->hw_enc_features    |= dev->features;
 899         dev->gso_max_size       = lowerdev->gso_max_size;
 900         dev->gso_max_segs       = lowerdev->gso_max_segs;
 901         dev->hard_header_len    = lowerdev->hard_header_len;
 902
 903         macvlan_set_lockdep_class(dev);
 904
 905         vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
 906         if (!vlan->pcpu_stats)
 907                 return -ENOMEM;
 908
 909         port->count += 1;
 910
 911         return 0;
 912 }
 913
 914 static void macvlan_uninit(struct net_device *dev)
 915 {
 916         struct macvlan_dev *vlan = netdev_priv(dev);
 917         struct macvlan_port *port = vlan->port;
 918
 919         free_percpu(vlan->pcpu_stats);
 920
 921         macvlan_flush_sources(port, vlan);
 922         port->count -= 1;
 923         if (!port->count)
 924                 macvlan_port_destroy(port->dev);
 925 }
 926
 927 static void macvlan_dev_get_stats64(struct net_device *dev,
 928                                     struct rtnl_link_stats64 *stats)
 929 {
 930         struct macvlan_dev *vlan = netdev_priv(dev);
 931
 932         if (vlan->pcpu_stats) {
 933                 struct vlan_pcpu_stats *p;
 934                 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
 935                 u32 rx_errors = 0, tx_dropped = 0;
 936                 unsigned int start;
 937                 int i;
 938
 939                 for_each_possible_cpu(i) {
 940                         p = per_cpu_ptr(vlan->pcpu_stats, i);
 941                         do {
 942                                 start = u64_stats_fetch_begin_irq(&p->syncp);
 943                                 rx_packets      = p->rx_packets;
 944                                 rx_bytes        = p->rx_bytes;
 945                                 rx_multicast    = p->rx_multicast;
 946                                 tx_packets      = p->tx_packets;
 947                                 tx_bytes        = p->tx_bytes;
 948                         } while (u64_stats_fetch_retry_irq(&p->syncp, start));
 949
 950                         stats->rx_packets       += rx_packets;
 951                         stats->rx_bytes         += rx_bytes;
 952                         stats->multicast        += rx_multicast;
 953                         stats->tx_packets       += tx_packets;
 954                         stats->tx_bytes         += tx_bytes;
 955                         /* rx_errors & tx_dropped are u32, updated
 956                          * without syncp protection.
 957                          */
 958                         rx_errors       += p->rx_errors;
 959                         tx_dropped      += p->tx_dropped;
 960                 }
 961                 stats->rx_errors        = rx_errors;
 962                 stats->rx_dropped       = rx_errors;
 963                 stats->tx_dropped       = tx_dropped;
 964         }
 965 }
 966
 967 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
 968                                    __be16 proto, u16 vid)
 969 {
 970         struct macvlan_dev *vlan = netdev_priv(dev);
 971         struct net_device *lowerdev = vlan->lowerdev;
 972
 973         return vlan_vid_add(lowerdev, proto, vid);
 974 }
 975
 976 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
 977                                     __be16 proto, u16 vid)
 978 {
 979         struct macvlan_dev *vlan = netdev_priv(dev);
 980         struct net_device *lowerdev = vlan->lowerdev;
 981
 982         vlan_vid_del(lowerdev, proto, vid);
 983         return 0;
 984 }
 985
 986 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 987                            struct net_device *dev,
 988                            const unsigned char *addr, u16 vid,
 989                            u16 flags,
 990                            struct netlink_ext_ack *extack)
 991 {
 992         struct macvlan_dev *vlan = netdev_priv(dev);
 993         int err = -EINVAL;
 994
 995         /* Support unicast filter only on passthru devices.
 996          * Multicast filter should be allowed on all devices.
 997          */
 998         if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
 999                 return -EOPNOTSUPP;
1000
1001         if (flags & NLM_F_REPLACE)
1002                 return -EOPNOTSUPP;
1003
1004         if (is_unicast_ether_addr(addr))
1005                 err = dev_uc_add_excl(dev, addr);
1006         else if (is_multicast_ether_addr(addr))
1007                 err = dev_mc_add_excl(dev, addr);
1008
1009         return err;
1010 }
1011
1012 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
1013                            struct net_device *dev,
1014                            const unsigned char *addr, u16 vid)
1015 {
1016         struct macvlan_dev *vlan = netdev_priv(dev);
1017         int err = -EINVAL;
1018
1019         /* Support unicast filter only on passthru devices.
1020          * Multicast filter should be allowed on all devices.
1021          */
1022         if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
1023                 return -EOPNOTSUPP;
1024
1025         if (is_unicast_ether_addr(addr))
1026                 err = dev_uc_del(dev, addr);
1027         else if (is_multicast_ether_addr(addr))
1028                 err = dev_mc_del(dev, addr);
1029
1030         return err;
1031 }
1032
1033 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
1034                                         struct ethtool_drvinfo *drvinfo)
1035 {
1036         strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
1037         strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
1038 }
1039
1040 static int macvlan_ethtool_get_link_ksettings(struct net_device *dev,
1041                                               struct ethtool_link_ksettings *cmd)
1042 {
1043         const struct macvlan_dev *vlan = netdev_priv(dev);
1044
1045         return __ethtool_get_link_ksettings(vlan->lowerdev, cmd);
1046 }
1047
1048 static int macvlan_ethtool_get_ts_info(struct net_device *dev,
1049                                        struct ethtool_ts_info *info)
1050 {
1051         struct net_device *real_dev = macvlan_dev_real_dev(dev);
1052         const struct ethtool_ops *ops = real_dev->ethtool_ops;
1053         struct phy_device *phydev = real_dev->phydev;
1054
1055         if (phydev && phydev->drv && phydev->drv->ts_info) {
1056                  return phydev->drv->ts_info(phydev, info);
1057         } else if (ops->get_ts_info) {
1058                 return ops->get_ts_info(real_dev, info);
1059         } else {
1060                 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
1061                         SOF_TIMESTAMPING_SOFTWARE;
1062                 info->phc_index = -1;
1063         }
1064
1065         return 0;
1066 }
1067
1068 static netdev_features_t macvlan_fix_features(struct net_device *dev,
1069                                               netdev_features_t features)
1070 {
1071         struct macvlan_dev *vlan = netdev_priv(dev);
1072         netdev_features_t lowerdev_features = vlan->lowerdev->features;
1073         netdev_features_t mask;
1074
1075         features |= NETIF_F_ALL_FOR_ALL;
1076         features &= (vlan->set_features | ~MACVLAN_FEATURES);
1077         mask = features;
1078
1079         lowerdev_features &= (features | ~NETIF_F_LRO);
1080         features = netdev_increment_features(lowerdev_features, features, mask);
1081         features |= ALWAYS_ON_FEATURES;
1082         features &= (ALWAYS_ON_FEATURES | MACVLAN_FEATURES);
1083
1084         return features;
1085 }
1086
1087 #ifdef CONFIG_NET_POLL_CONTROLLER
1088 static void macvlan_dev_poll_controller(struct net_device *dev)
1089 {
1090         return;
1091 }
1092
1093 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
1094 {
1095         struct macvlan_dev *vlan = netdev_priv(dev);
1096         struct net_device *real_dev = vlan->lowerdev;
1097         struct netpoll *netpoll;
1098         int err = 0;
1099
1100         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
1101         err = -ENOMEM;
1102         if (!netpoll)
1103                 goto out;
1104
1105         err = __netpoll_setup(netpoll, real_dev);
1106         if (err) {
1107                 kfree(netpoll);
1108                 goto out;
1109         }
1110
1111         vlan->netpoll = netpoll;
1112
1113 out:
1114         return err;
1115 }
1116
1117 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
1118 {
1119         struct macvlan_dev *vlan = netdev_priv(dev);
1120         struct netpoll *netpoll = vlan->netpoll;
1121
1122         if (!netpoll)
1123                 return;
1124
1125         vlan->netpoll = NULL;
1126
1127         __netpoll_free(netpoll);
1128 }
1129 #endif  /* CONFIG_NET_POLL_CONTROLLER */
1130
1131 static int macvlan_dev_get_iflink(const struct net_device *dev)
1132 {
1133         struct macvlan_dev *vlan = netdev_priv(dev);
1134
1135         return vlan->lowerdev->ifindex;
1136 }
1137
1138 static const struct ethtool_ops macvlan_ethtool_ops = {
1139         .get_link               = ethtool_op_get_link,
1140         .get_link_ksettings     = macvlan_ethtool_get_link_ksettings,
1141         .get_drvinfo            = macvlan_ethtool_get_drvinfo,
1142         .get_ts_info            = macvlan_ethtool_get_ts_info,
1143 };
1144
1145 static const struct net_device_ops macvlan_netdev_ops = {
1146         .ndo_init               = macvlan_init,
1147         .ndo_uninit             = macvlan_uninit,
1148         .ndo_open               = macvlan_open,
1149         .ndo_stop               = macvlan_stop,
1150         .ndo_start_xmit         = macvlan_start_xmit,
1151         .ndo_change_mtu         = macvlan_change_mtu,
1152         .ndo_do_ioctl           = macvlan_do_ioctl,
1153         .ndo_fix_features       = macvlan_fix_features,
1154         .ndo_change_rx_flags    = macvlan_change_rx_flags,
1155         .ndo_set_mac_address    = macvlan_set_mac_address,
1156         .ndo_set_rx_mode        = macvlan_set_mac_lists,
1157         .ndo_get_stats64        = macvlan_dev_get_stats64,
1158         .ndo_validate_addr      = eth_validate_addr,
1159         .ndo_vlan_rx_add_vid    = macvlan_vlan_rx_add_vid,
1160         .ndo_vlan_rx_kill_vid   = macvlan_vlan_rx_kill_vid,
1161         .ndo_fdb_add            = macvlan_fdb_add,
1162         .ndo_fdb_del            = macvlan_fdb_del,
1163         .ndo_fdb_dump           = ndo_dflt_fdb_dump,
1164         .ndo_get_lock_subclass  = macvlan_get_nest_level,
1165 #ifdef CONFIG_NET_POLL_CONTROLLER
1166         .ndo_poll_controller    = macvlan_dev_poll_controller,
1167         .ndo_netpoll_setup      = macvlan_dev_netpoll_setup,
1168         .ndo_netpoll_cleanup    = macvlan_dev_netpoll_cleanup,
1169 #endif
1170         .ndo_get_iflink         = macvlan_dev_get_iflink,
1171         .ndo_features_check     = passthru_features_check,
1172         .ndo_change_proto_down  = dev_change_proto_down_generic,
1173 };
1174
1175 void macvlan_common_setup(struct net_device *dev)
1176 {
1177         ether_setup(dev);
1178
1179         dev->min_mtu            = 0;
1180         dev->max_mtu            = ETH_MAX_MTU;
1181         dev->priv_flags        &= ~IFF_TX_SKB_SHARING;
1182         netif_keep_dst(dev);
1183         dev->priv_flags        |= IFF_UNICAST_FLT;
1184         dev->netdev_ops         = &macvlan_netdev_ops;
1185         dev->needs_free_netdev  = true;
1186         dev->header_ops         = &macvlan_hard_header_ops;
1187         dev->ethtool_ops        = &macvlan_ethtool_ops;
1188 }
1189 EXPORT_SYMBOL_GPL(macvlan_common_setup);
1190
1191 static void macvlan_setup(struct net_device *dev)
1192 {
1193         macvlan_common_setup(dev);
1194         dev->priv_flags |= IFF_NO_QUEUE;
1195 }
1196
1197 static int macvlan_port_create(struct net_device *dev)
1198 {
1199         struct macvlan_port *port;
1200         unsigned int i;
1201         int err;
1202
1203         if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1204                 return -EINVAL;
1205
1206         if (netdev_is_rx_handler_busy(dev))
1207                 return -EBUSY;
1208
1209         port = kzalloc(sizeof(*port), GFP_KERNEL);
1210         if (port == NULL)
1211                 return -ENOMEM;
1212
1213         port->dev = dev;
1214         ether_addr_copy(port->perm_addr, dev->dev_addr);
1215         INIT_LIST_HEAD(&port->vlans);
1216         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1217                 INIT_HLIST_HEAD(&port->vlan_hash[i]);
1218         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1219                 INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1220
1221         skb_queue_head_init(&port->bc_queue);
1222         INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1223
1224         err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1225         if (err)
1226                 kfree(port);
1227         else
1228                 dev->priv_flags |= IFF_MACVLAN_PORT;
1229         return err;
1230 }
1231
1232 static void macvlan_port_destroy(struct net_device *dev)
1233 {
1234         struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1235         struct sk_buff *skb;
1236
1237         dev->priv_flags &= ~IFF_MACVLAN_PORT;
1238         netdev_rx_handler_unregister(dev);
1239
1240         /* After this point, no packet can schedule bc_work anymore,
1241          * but we need to cancel it and purge left skbs if any.
1242          */
1243         cancel_work_sync(&port->bc_work);
1244
1245         while ((skb = __skb_dequeue(&port->bc_queue))) {
1246                 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
1247
1248                 if (src)
1249                         dev_put(src->dev);
1250
1251                 kfree_skb(skb);
1252         }
1253
1254         /* If the lower device address has been changed by passthru
1255          * macvlan, put it back.
1256          */
1257         if (macvlan_passthru(port) &&
1258             !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) {
1259                 struct sockaddr sa;
1260
1261                 sa.sa_family = port->dev->type;
1262                 memcpy(&sa.sa_data, port->perm_addr, port->dev->addr_len);
1263                 dev_set_mac_address(port->dev, &sa, NULL);
1264         }
1265
1266         kfree(port);
1267 }
1268
1269 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[],
1270                             struct netlink_ext_ack *extack)
1271 {
1272         if (tb[IFLA_ADDRESS]) {
1273                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1274                         return -EINVAL;
1275                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1276                         return -EADDRNOTAVAIL;
1277         }
1278
1279         if (!data)
1280                 return 0;
1281
1282         if (data[IFLA_MACVLAN_FLAGS] &&
1283             nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
1284                 return -EINVAL;
1285
1286         if (data[IFLA_MACVLAN_MODE]) {
1287                 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1288                 case MACVLAN_MODE_PRIVATE:
1289                 case MACVLAN_MODE_VEPA:
1290                 case MACVLAN_MODE_BRIDGE:
1291                 case MACVLAN_MODE_PASSTHRU:
1292                 case MACVLAN_MODE_SOURCE:
1293                         break;
1294                 default:
1295                         return -EINVAL;
1296                 }
1297         }
1298
1299         if (data[IFLA_MACVLAN_MACADDR_MODE]) {
1300                 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1301                 case MACVLAN_MACADDR_ADD:
1302                 case MACVLAN_MACADDR_DEL:
1303                 case MACVLAN_MACADDR_FLUSH:
1304                 case MACVLAN_MACADDR_SET:
1305                         break;
1306                 default:
1307                         return -EINVAL;
1308                 }
1309         }
1310
1311         if (data[IFLA_MACVLAN_MACADDR]) {
1312                 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1313                         return -EINVAL;
1314
1315                 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1316                         return -EADDRNOTAVAIL;
1317         }
1318
1319         if (data[IFLA_MACVLAN_MACADDR_COUNT])
1320                 return -EINVAL;
1321
1322         return 0;
1323 }
1324
1325 /**
1326  * reconfigure list of remote source mac address
1327  * (only for macvlan devices in source mode)
1328  * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1329  * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1330  */
1331 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1332                                       struct nlattr *data[])
1333 {
1334         char *addr = NULL;
1335         int ret, rem, len;
1336         struct nlattr *nla, *head;
1337         struct macvlan_source_entry *entry;
1338
1339         if (data[IFLA_MACVLAN_MACADDR])
1340                 addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1341
1342         if (mode == MACVLAN_MACADDR_ADD) {
1343                 if (!addr)
1344                         return -EINVAL;
1345
1346                 return macvlan_hash_add_source(vlan, addr);
1347
1348         } else if (mode == MACVLAN_MACADDR_DEL) {
1349                 if (!addr)
1350                         return -EINVAL;
1351
1352                 entry = macvlan_hash_lookup_source(vlan, addr);
1353                 if (entry) {
1354                         macvlan_hash_del_source(entry);
1355                         vlan->macaddr_count--;
1356                 }
1357         } else if (mode == MACVLAN_MACADDR_FLUSH) {
1358                 macvlan_flush_sources(vlan->port, vlan);
1359         } else if (mode == MACVLAN_MACADDR_SET) {
1360                 macvlan_flush_sources(vlan->port, vlan);
1361
1362                 if (addr) {
1363                         ret = macvlan_hash_add_source(vlan, addr);
1364                         if (ret)
1365                                 return ret;
1366                 }
1367
1368                 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA])
1369                         return 0;
1370
1371                 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1372                 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1373
1374                 nla_for_each_attr(nla, head, len, rem) {
1375                         if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1376                             nla_len(nla) != ETH_ALEN)
1377                                 continue;
1378
1379                         addr = nla_data(nla);
1380                         ret = macvlan_hash_add_source(vlan, addr);
1381                         if (ret)
1382                                 return ret;
1383                 }
1384         } else {
1385                 return -EINVAL;
1386         }
1387
1388         return 0;
1389 }
1390
1391 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1392                            struct nlattr *tb[], struct nlattr *data[],
1393                            struct netlink_ext_ack *extack)
1394 {
1395         struct macvlan_dev *vlan = netdev_priv(dev);
1396         struct macvlan_port *port;
1397         struct net_device *lowerdev;
1398         int err;
1399         int macmode;
1400         bool create = false;
1401
1402         if (!tb[IFLA_LINK])
1403                 return -EINVAL;
1404
1405         lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1406         if (lowerdev == NULL)
1407                 return -ENODEV;
1408
1409         /* When creating macvlans or macvtaps on top of other macvlans - use
1410          * the real device as the lowerdev.
1411          */
1412         if (netif_is_macvlan(lowerdev))
1413                 lowerdev = macvlan_dev_real_dev(lowerdev);
1414
1415         if (!tb[IFLA_MTU])
1416                 dev->mtu = lowerdev->mtu;
1417         else if (dev->mtu > lowerdev->mtu)
1418                 return -EINVAL;
1419
1420         /* MTU range: 68 - lowerdev->max_mtu */
1421         dev->min_mtu = ETH_MIN_MTU;
1422         dev->max_mtu = lowerdev->max_mtu;
1423
1424         if (!tb[IFLA_ADDRESS])
1425                 eth_hw_addr_random(dev);
1426
1427         if (!netif_is_macvlan_port(lowerdev)) {
1428                 err = macvlan_port_create(lowerdev);
1429                 if (err < 0)
1430                         return err;
1431                 create = true;
1432         }
1433         port = macvlan_port_get_rtnl(lowerdev);
1434
1435         /* Only 1 macvlan device can be created in passthru mode */
1436         if (macvlan_passthru(port)) {
1437                 /* The macvlan port must be not created this time,
1438                  * still goto destroy_macvlan_port for readability.
1439                  */
1440                 err = -EINVAL;
1441                 goto destroy_macvlan_port;
1442         }
1443
1444         vlan->lowerdev = lowerdev;
1445         vlan->dev      = dev;
1446         vlan->port     = port;
1447         vlan->set_features = MACVLAN_FEATURES;
1448         vlan->nest_level = dev_get_nest_level(lowerdev) + 1;
1449
1450         vlan->mode     = MACVLAN_MODE_VEPA;
1451         if (data && data[IFLA_MACVLAN_MODE])
1452                 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1453
1454         if (data && data[IFLA_MACVLAN_FLAGS])
1455                 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1456
1457         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1458                 if (port->count) {
1459                         err = -EINVAL;
1460                         goto destroy_macvlan_port;
1461                 }
1462                 macvlan_set_passthru(port);
1463                 eth_hw_addr_inherit(dev, lowerdev);
1464         }
1465
1466         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1467                 if (vlan->mode != MACVLAN_MODE_SOURCE) {
1468                         err = -EINVAL;
1469                         goto destroy_macvlan_port;
1470                 }
1471                 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1472                 err = macvlan_changelink_sources(vlan, macmode, data);
1473                 if (err)
1474                         goto destroy_macvlan_port;
1475         }
1476
1477         err = register_netdevice(dev);
1478         if (err < 0)
1479                 goto destroy_macvlan_port;
1480
1481         dev->priv_flags |= IFF_MACVLAN;
1482         err = netdev_upper_dev_link(lowerdev, dev, extack);
1483         if (err)
1484                 goto unregister_netdev;
1485
1486         list_add_tail_rcu(&vlan->list, &port->vlans);
1487         netif_stacked_transfer_operstate(lowerdev, dev);
1488         linkwatch_fire_event(dev);
1489
1490         return 0;
1491
1492 unregister_netdev:
1493         /* macvlan_uninit would free the macvlan port */
1494         unregister_netdevice(dev);
1495         return err;
1496 destroy_macvlan_port:
1497         /* the macvlan port may be freed by macvlan_uninit when fail to register.
1498          * so we destroy the macvlan port only when it's valid.
1499          */
1500         if (create && macvlan_port_get_rtnl(lowerdev))
1501                 macvlan_port_destroy(port->dev);
1502         return err;
1503 }
1504 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1505
1506 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1507                            struct nlattr *tb[], struct nlattr *data[],
1508                            struct netlink_ext_ack *extack)
1509 {
1510         return macvlan_common_newlink(src_net, dev, tb, data, extack);
1511 }
1512
1513 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1514 {
1515         struct macvlan_dev *vlan = netdev_priv(dev);
1516
1517         if (vlan->mode == MACVLAN_MODE_SOURCE)
1518                 macvlan_flush_sources(vlan->port, vlan);
1519         list_del_rcu(&vlan->list);
1520         unregister_netdevice_queue(dev, head);
1521         netdev_upper_dev_unlink(vlan->lowerdev, dev);
1522 }
1523 EXPORT_SYMBOL_GPL(macvlan_dellink);
1524
1525 static int macvlan_changelink(struct net_device *dev,
1526                               struct nlattr *tb[], struct nlattr *data[],
1527                               struct netlink_ext_ack *extack)
1528 {
1529         struct macvlan_dev *vlan = netdev_priv(dev);
1530         enum macvlan_mode mode;
1531         bool set_mode = false;
1532         enum macvlan_macaddr_mode macmode;
1533         int ret;
1534
1535         /* Validate mode, but don't set yet: setting flags may fail. */
1536         if (data && data[IFLA_MACVLAN_MODE]) {
1537                 set_mode = true;
1538                 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1539                 /* Passthrough mode can't be set or cleared dynamically */
1540                 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1541                     (vlan->mode == MACVLAN_MODE_PASSTHRU))
1542                         return -EINVAL;
1543                 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1544                     vlan->mode != mode)
1545                         macvlan_flush_sources(vlan->port, vlan);
1546         }
1547
1548         if (data && data[IFLA_MACVLAN_FLAGS]) {
1549                 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1550                 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1551                 if (macvlan_passthru(vlan->port) && promisc) {
1552                         int err;
1553
1554                         if (flags & MACVLAN_FLAG_NOPROMISC)
1555                                 err = dev_set_promiscuity(vlan->lowerdev, -1);
1556                         else
1557                                 err = dev_set_promiscuity(vlan->lowerdev, 1);
1558                         if (err < 0)
1559                                 return err;
1560                 }
1561                 vlan->flags = flags;
1562         }
1563         if (set_mode)
1564                 vlan->mode = mode;
1565         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1566                 if (vlan->mode != MACVLAN_MODE_SOURCE)
1567                         return -EINVAL;
1568                 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1569                 ret = macvlan_changelink_sources(vlan, macmode, data);
1570                 if (ret)
1571                         return ret;
1572         }
1573         return 0;
1574 }
1575
1576 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1577 {
1578         if (vlan->macaddr_count == 0)
1579                 return 0;
1580         return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1581                 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1582 }
1583
1584 static size_t macvlan_get_size(const struct net_device *dev)
1585 {
1586         struct macvlan_dev *vlan = netdev_priv(dev);
1587
1588         return (0
1589                 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1590                 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1591                 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1592                 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1593                 );
1594 }
1595
1596 static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1597                                      const struct macvlan_dev *vlan,
1598                                      const int i)
1599 {
1600         struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1601         struct macvlan_source_entry *entry;
1602
1603         hlist_for_each_entry_rcu(entry, h, hlist) {
1604                 if (entry->vlan != vlan)
1605                         continue;
1606                 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1607                         return 1;
1608         }
1609         return 0;
1610 }
1611
1612 static int macvlan_fill_info(struct sk_buff *skb,
1613                                 const struct net_device *dev)
1614 {
1615         struct macvlan_dev *vlan = netdev_priv(dev);
1616         int i;
1617         struct nlattr *nest;
1618
1619         if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1620                 goto nla_put_failure;
1621         if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1622                 goto nla_put_failure;
1623         if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1624                 goto nla_put_failure;
1625         if (vlan->macaddr_count > 0) {
1626                 nest = nla_nest_start_noflag(skb, IFLA_MACVLAN_MACADDR_DATA);
1627                 if (nest == NULL)
1628                         goto nla_put_failure;
1629
1630                 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1631                         if (macvlan_fill_info_macaddr(skb, vlan, i))
1632                                 goto nla_put_failure;
1633                 }
1634                 nla_nest_end(skb, nest);
1635         }
1636         return 0;
1637
1638 nla_put_failure:
1639         return -EMSGSIZE;
1640 }
1641
1642 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1643         [IFLA_MACVLAN_MODE]  = { .type = NLA_U32 },
1644         [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1645         [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1646         [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1647         [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1648         [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1649 };
1650
1651 int macvlan_link_register(struct rtnl_link_ops *ops)
1652 {
1653         /* common fields */
1654         ops->validate           = macvlan_validate;
1655         ops->maxtype            = IFLA_MACVLAN_MAX;
1656         ops->policy             = macvlan_policy;
1657         ops->changelink         = macvlan_changelink;
1658         ops->get_size           = macvlan_get_size;
1659         ops->fill_info          = macvlan_fill_info;
1660
1661         return rtnl_link_register(ops);
1662 };
1663 EXPORT_SYMBOL_GPL(macvlan_link_register);
1664
1665 static struct net *macvlan_get_link_net(const struct net_device *dev)
1666 {
1667         return dev_net(macvlan_dev_real_dev(dev));
1668 }
1669
1670 static struct rtnl_link_ops macvlan_link_ops = {
1671         .kind           = "macvlan",
1672         .setup          = macvlan_setup,
1673         .newlink        = macvlan_newlink,
1674         .dellink        = macvlan_dellink,
1675         .get_link_net   = macvlan_get_link_net,
1676         .priv_size      = sizeof(struct macvlan_dev),
1677 };
1678
1679 static int macvlan_device_event(struct notifier_block *unused,
1680                                 unsigned long event, void *ptr)
1681 {
1682         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1683         struct macvlan_dev *vlan, *next;
1684         struct macvlan_port *port;
1685         LIST_HEAD(list_kill);
1686
1687         if (!netif_is_macvlan_port(dev))
1688                 return NOTIFY_DONE;
1689
1690         port = macvlan_port_get_rtnl(dev);
1691
1692         switch (event) {
1693         case NETDEV_UP:
1694         case NETDEV_DOWN:
1695         case NETDEV_CHANGE:
1696                 list_for_each_entry(vlan, &port->vlans, list)
1697                         netif_stacked_transfer_operstate(vlan->lowerdev,
1698                                                          vlan->dev);
1699                 break;
1700         case NETDEV_FEAT_CHANGE:
1701                 list_for_each_entry(vlan, &port->vlans, list) {
1702                         vlan->dev->gso_max_size = dev->gso_max_size;
1703                         vlan->dev->gso_max_segs = dev->gso_max_segs;
1704                         netdev_update_features(vlan->dev);
1705                 }
1706                 break;
1707         case NETDEV_CHANGEMTU:
1708                 list_for_each_entry(vlan, &port->vlans, list) {
1709                         if (vlan->dev->mtu <= dev->mtu)
1710                                 continue;
1711                         dev_set_mtu(vlan->dev, dev->mtu);
1712                 }
1713                 break;
1714         case NETDEV_CHANGEADDR:
1715                 if (!macvlan_passthru(port))
1716                         return NOTIFY_DONE;
1717
1718                 vlan = list_first_entry_or_null(&port->vlans,
1719                                                 struct macvlan_dev,
1720                                                 list);
1721
1722                 if (macvlan_sync_address(vlan->dev, dev->dev_addr))
1723                         return NOTIFY_BAD;
1724
1725                 break;
1726         case NETDEV_UNREGISTER:
1727                 /* twiddle thumbs on netns device moves */
1728                 if (dev->reg_state != NETREG_UNREGISTERING)
1729                         break;
1730
1731                 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1732                         vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1733                 unregister_netdevice_many(&list_kill);
1734                 break;
1735         case NETDEV_PRE_TYPE_CHANGE:
1736                 /* Forbid underlaying device to change its type. */
1737                 return NOTIFY_BAD;
1738
1739         case NETDEV_NOTIFY_PEERS:
1740         case NETDEV_BONDING_FAILOVER:
1741         case NETDEV_RESEND_IGMP:
1742                 /* Propagate to all vlans */
1743                 list_for_each_entry(vlan, &port->vlans, list)
1744                         call_netdevice_notifiers(event, vlan->dev);
1745         }
1746         return NOTIFY_DONE;
1747 }
1748
1749 static struct notifier_block macvlan_notifier_block __read_mostly = {
1750         .notifier_call  = macvlan_device_event,
1751 };
1752
1753 static int __init macvlan_init_module(void)
1754 {
1755         int err;
1756
1757         register_netdevice_notifier(&macvlan_notifier_block);
1758
1759         err = macvlan_link_register(&macvlan_link_ops);
1760         if (err < 0)
1761                 goto err1;
1762         return 0;
1763 err1:
1764         unregister_netdevice_notifier(&macvlan_notifier_block);
1765         return err;
1766 }
1767
1768 static void __exit macvlan_cleanup_module(void)
1769 {
1770         rtnl_link_unregister(&macvlan_link_ops);
1771         unregister_netdevice_notifier(&macvlan_notifier_block);
1772 }
1773
1774 module_init(macvlan_init_module);
1775 module_exit(macvlan_cleanup_module);
1776
1777 MODULE_LICENSE("GPL");
1778 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1779 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1780 MODULE_ALIAS_RTNL_LINK("macvlan");