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                 cond_resched();
 339         }
 340 }
 341
 342 static void macvlan_broadcast_enqueue(struct macvlan_port *port,
 343                                       const struct macvlan_dev *src,
 344                                       struct sk_buff *skb)
 345 {
 346         struct sk_buff *nskb;
 347         int err = -ENOMEM;
 348
 349         nskb = skb_clone(skb, GFP_ATOMIC);
 350         if (!nskb)
 351                 goto err;
 352
 353         MACVLAN_SKB_CB(nskb)->src = src;
 354
 355         spin_lock(&port->bc_queue.lock);
 356         if (skb_queue_len(&port->bc_queue) < MACVLAN_BC_QUEUE_LEN) {
 357                 if (src)
 358                         dev_hold(src->dev);
 359                 __skb_queue_tail(&port->bc_queue, nskb);
 360                 err = 0;
 361         }
 362         spin_unlock(&port->bc_queue.lock);
 363
 364         schedule_work(&port->bc_work);
 365
 366         if (err)
 367                 goto free_nskb;
 368
 369         return;
 370
 371 free_nskb:
 372         kfree_skb(nskb);
 373 err:
 374         atomic_long_inc(&skb->dev->rx_dropped);
 375 }
 376
 377 static void macvlan_flush_sources(struct macvlan_port *port,
 378                                   struct macvlan_dev *vlan)
 379 {
 380         int i;
 381
 382         for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
 383                 struct hlist_node *h, *n;
 384
 385                 hlist_for_each_safe(h, n, &port->vlan_source_hash[i]) {
 386                         struct macvlan_source_entry *entry;
 387
 388                         entry = hlist_entry(h, struct macvlan_source_entry,
 389                                             hlist);
 390                         if (entry->vlan == vlan)
 391                                 macvlan_hash_del_source(entry);
 392                 }
 393         }
 394         vlan->macaddr_count = 0;
 395 }
 396
 397 static void macvlan_forward_source_one(struct sk_buff *skb,
 398                                        struct macvlan_dev *vlan)
 399 {
 400         struct sk_buff *nskb;
 401         struct net_device *dev;
 402         int len;
 403         int ret;
 404
 405         dev = vlan->dev;
 406         if (unlikely(!(dev->flags & IFF_UP)))
 407                 return;
 408
 409         nskb = skb_clone(skb, GFP_ATOMIC);
 410         if (!nskb)
 411                 return;
 412
 413         len = nskb->len + ETH_HLEN;
 414         nskb->dev = dev;
 415
 416         if (ether_addr_equal_64bits(eth_hdr(skb)->h_dest, dev->dev_addr))
 417                 nskb->pkt_type = PACKET_HOST;
 418
 419         ret = netif_rx(nskb);
 420         macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
 421 }
 422
 423 static void macvlan_forward_source(struct sk_buff *skb,
 424                                    struct macvlan_port *port,
 425                                    const unsigned char *addr)
 426 {
 427         struct macvlan_source_entry *entry;
 428         u32 idx = macvlan_eth_hash(addr);
 429         struct hlist_head *h = &port->vlan_source_hash[idx];
 430
 431         hlist_for_each_entry_rcu(entry, h, hlist) {
 432                 if (ether_addr_equal_64bits(entry->addr, addr))
 433                         macvlan_forward_source_one(skb, entry->vlan);
 434         }
 435 }
 436
 437 /* called under rcu_read_lock() from netif_receive_skb */
 438 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
 439 {
 440         struct macvlan_port *port;
 441         struct sk_buff *skb = *pskb;
 442         const struct ethhdr *eth = eth_hdr(skb);
 443         const struct macvlan_dev *vlan;
 444         const struct macvlan_dev *src;
 445         struct net_device *dev;
 446         unsigned int len = 0;
 447         int ret;
 448         rx_handler_result_t handle_res;
 449
 450         port = macvlan_port_get_rcu(skb->dev);
 451         if (is_multicast_ether_addr(eth->h_dest)) {
 452                 unsigned int hash;
 453
 454                 skb = ip_check_defrag(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN);
 455                 if (!skb)
 456                         return RX_HANDLER_CONSUMED;
 457                 *pskb = skb;
 458                 eth = eth_hdr(skb);
 459                 macvlan_forward_source(skb, port, eth->h_source);
 460                 src = macvlan_hash_lookup(port, eth->h_source);
 461                 if (src && src->mode != MACVLAN_MODE_VEPA &&
 462                     src->mode != MACVLAN_MODE_BRIDGE) {
 463                         /* forward to original port. */
 464                         vlan = src;
 465                         ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
 466                               netif_rx(skb);
 467                         handle_res = RX_HANDLER_CONSUMED;
 468                         goto out;
 469                 }
 470
 471                 hash = mc_hash(NULL, eth->h_dest);
 472                 if (test_bit(hash, port->mc_filter))
 473                         macvlan_broadcast_enqueue(port, src, skb);
 474
 475                 return RX_HANDLER_PASS;
 476         }
 477
 478         macvlan_forward_source(skb, port, eth->h_source);
 479         if (macvlan_passthru(port))
 480                 vlan = list_first_or_null_rcu(&port->vlans,
 481                                               struct macvlan_dev, list);
 482         else
 483                 vlan = macvlan_hash_lookup(port, eth->h_dest);
 484         if (!vlan || vlan->mode == MACVLAN_MODE_SOURCE)
 485                 return RX_HANDLER_PASS;
 486
 487         dev = vlan->dev;
 488         if (unlikely(!(dev->flags & IFF_UP))) {
 489                 kfree_skb(skb);
 490                 return RX_HANDLER_CONSUMED;
 491         }
 492         len = skb->len + ETH_HLEN;
 493         skb = skb_share_check(skb, GFP_ATOMIC);
 494         if (!skb) {
 495                 ret = NET_RX_DROP;
 496                 handle_res = RX_HANDLER_CONSUMED;
 497                 goto out;
 498         }
 499
 500         *pskb = skb;
 501         skb->dev = dev;
 502         skb->pkt_type = PACKET_HOST;
 503
 504         ret = NET_RX_SUCCESS;
 505         handle_res = RX_HANDLER_ANOTHER;
 506 out:
 507         macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
 508         return handle_res;
 509 }
 510
 511 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
 512 {
 513         const struct macvlan_dev *vlan = netdev_priv(dev);
 514         const struct macvlan_port *port = vlan->port;
 515         const struct macvlan_dev *dest;
 516
 517         if (vlan->mode == MACVLAN_MODE_BRIDGE) {
 518                 const struct ethhdr *eth = skb_eth_hdr(skb);
 519
 520                 /* send to other bridge ports directly */
 521                 if (is_multicast_ether_addr(eth->h_dest)) {
 522                         skb_reset_mac_header(skb);
 523                         macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
 524                         goto xmit_world;
 525                 }
 526
 527                 dest = macvlan_hash_lookup(port, eth->h_dest);
 528                 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
 529                         /* send to lowerdev first for its network taps */
 530                         dev_forward_skb(vlan->lowerdev, skb);
 531
 532                         return NET_XMIT_SUCCESS;
 533                 }
 534         }
 535 xmit_world:
 536         skb->dev = vlan->lowerdev;
 537         return dev_queue_xmit_accel(skb,
 538                                     netdev_get_sb_channel(dev) ? dev : NULL);
 539 }
 540
 541 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
 542 {
 543 #ifdef CONFIG_NET_POLL_CONTROLLER
 544         if (vlan->netpoll)
 545                 netpoll_send_skb(vlan->netpoll, skb);
 546 #else
 547         BUG();
 548 #endif
 549         return NETDEV_TX_OK;
 550 }
 551
 552 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
 553                                       struct net_device *dev)
 554 {
 555         struct macvlan_dev *vlan = netdev_priv(dev);
 556         unsigned int len = skb->len;
 557         int ret;
 558
 559         if (unlikely(netpoll_tx_running(dev)))
 560                 return macvlan_netpoll_send_skb(vlan, skb);
 561
 562         ret = macvlan_queue_xmit(skb, dev);
 563
 564         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 565                 struct vlan_pcpu_stats *pcpu_stats;
 566
 567                 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
 568                 u64_stats_update_begin(&pcpu_stats->syncp);
 569                 pcpu_stats->tx_packets++;
 570                 pcpu_stats->tx_bytes += len;
 571                 u64_stats_update_end(&pcpu_stats->syncp);
 572         } else {
 573                 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
 574         }
 575         return ret;
 576 }
 577
 578 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
 579                                unsigned short type, const void *daddr,
 580                                const void *saddr, unsigned len)
 581 {
 582         const struct macvlan_dev *vlan = netdev_priv(dev);
 583         struct net_device *lowerdev = vlan->lowerdev;
 584
 585         return dev_hard_header(skb, lowerdev, type, daddr,
 586                                saddr ? : dev->dev_addr, len);
 587 }
 588
 589 static const struct header_ops macvlan_hard_header_ops = {
 590         .create         = macvlan_hard_header,
 591         .parse          = eth_header_parse,
 592         .cache          = eth_header_cache,
 593         .cache_update   = eth_header_cache_update,
 594 };
 595
 596 static int macvlan_open(struct net_device *dev)
 597 {
 598         struct macvlan_dev *vlan = netdev_priv(dev);
 599         struct net_device *lowerdev = vlan->lowerdev;
 600         int err;
 601
 602         if (macvlan_passthru(vlan->port)) {
 603                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
 604                         err = dev_set_promiscuity(lowerdev, 1);
 605                         if (err < 0)
 606                                 goto out;
 607                 }
 608                 goto hash_add;
 609         }
 610
 611         err = -EADDRINUSE;
 612         if (macvlan_addr_busy(vlan->port, dev->dev_addr))
 613                 goto out;
 614
 615         /* Attempt to populate accel_priv which is used to offload the L2
 616          * forwarding requests for unicast packets.
 617          */
 618         if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD)
 619                 vlan->accel_priv =
 620                       lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
 621
 622         /* If earlier attempt to offload failed, or accel_priv is not
 623          * populated we must add the unicast address to the lower device.
 624          */
 625         if (IS_ERR_OR_NULL(vlan->accel_priv)) {
 626                 vlan->accel_priv = NULL;
 627                 err = dev_uc_add(lowerdev, dev->dev_addr);
 628                 if (err < 0)
 629                         goto out;
 630         }
 631
 632         if (dev->flags & IFF_ALLMULTI) {
 633                 err = dev_set_allmulti(lowerdev, 1);
 634                 if (err < 0)
 635                         goto del_unicast;
 636         }
 637
 638         if (dev->flags & IFF_PROMISC) {
 639                 err = dev_set_promiscuity(lowerdev, 1);
 640                 if (err < 0)
 641                         goto clear_multi;
 642         }
 643
 644 hash_add:
 645         macvlan_hash_add(vlan);
 646         return 0;
 647
 648 clear_multi:
 649         if (dev->flags & IFF_ALLMULTI)
 650                 dev_set_allmulti(lowerdev, -1);
 651 del_unicast:
 652         if (vlan->accel_priv) {
 653                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
 654                                                            vlan->accel_priv);
 655                 vlan->accel_priv = NULL;
 656         } else {
 657                 dev_uc_del(lowerdev, dev->dev_addr);
 658         }
 659 out:
 660         return err;
 661 }
 662
 663 static int macvlan_stop(struct net_device *dev)
 664 {
 665         struct macvlan_dev *vlan = netdev_priv(dev);
 666         struct net_device *lowerdev = vlan->lowerdev;
 667
 668         if (vlan->accel_priv) {
 669                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
 670                                                            vlan->accel_priv);
 671                 vlan->accel_priv = NULL;
 672         }
 673
 674         dev_uc_unsync(lowerdev, dev);
 675         dev_mc_unsync(lowerdev, dev);
 676
 677         if (macvlan_passthru(vlan->port)) {
 678                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
 679                         dev_set_promiscuity(lowerdev, -1);
 680                 goto hash_del;
 681         }
 682
 683         if (dev->flags & IFF_ALLMULTI)
 684                 dev_set_allmulti(lowerdev, -1);
 685
 686         if (dev->flags & IFF_PROMISC)
 687                 dev_set_promiscuity(lowerdev, -1);
 688
 689         dev_uc_del(lowerdev, dev->dev_addr);
 690
 691 hash_del:
 692         macvlan_hash_del(vlan, !dev->dismantle);
 693         return 0;
 694 }
 695
 696 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
 697 {
 698         struct macvlan_dev *vlan = netdev_priv(dev);
 699         struct net_device *lowerdev = vlan->lowerdev;
 700         struct macvlan_port *port = vlan->port;
 701         int err;
 702
 703         if (!(dev->flags & IFF_UP)) {
 704                 /* Just copy in the new address */
 705                 ether_addr_copy(dev->dev_addr, addr);
 706         } else {
 707                 /* Rehash and update the device filters */
 708                 if (macvlan_addr_busy(vlan->port, addr))
 709                         return -EADDRINUSE;
 710
 711                 if (!macvlan_passthru(port)) {
 712                         err = dev_uc_add(lowerdev, addr);
 713                         if (err)
 714                                 return err;
 715
 716                         dev_uc_del(lowerdev, dev->dev_addr);
 717                 }
 718
 719                 macvlan_hash_change_addr(vlan, addr);
 720         }
 721         if (macvlan_passthru(port) && !macvlan_addr_change(port)) {
 722                 /* Since addr_change isn't set, we are here due to lower
 723                  * device change.  Save the lower-dev address so we can
 724                  * restore it later.
 725                  */
 726                 ether_addr_copy(vlan->port->perm_addr,
 727                                 lowerdev->dev_addr);
 728         }
 729         macvlan_clear_addr_change(port);
 730         return 0;
 731 }
 732
 733 static int macvlan_set_mac_address(struct net_device *dev, void *p)
 734 {
 735         struct macvlan_dev *vlan = netdev_priv(dev);
 736         struct sockaddr *addr = p;
 737
 738         if (!is_valid_ether_addr(addr->sa_data))
 739                 return -EADDRNOTAVAIL;
 740
 741         /* If the addresses are the same, this is a no-op */
 742         if (ether_addr_equal(dev->dev_addr, addr->sa_data))
 743                 return 0;
 744
 745         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
 746                 macvlan_set_addr_change(vlan->port);
 747                 return dev_set_mac_address(vlan->lowerdev, addr, NULL);
 748         }
 749
 750         if (macvlan_addr_busy(vlan->port, addr->sa_data))
 751                 return -EADDRINUSE;
 752
 753         return macvlan_sync_address(dev, addr->sa_data);
 754 }
 755
 756 static void macvlan_change_rx_flags(struct net_device *dev, int change)
 757 {
 758         struct macvlan_dev *vlan = netdev_priv(dev);
 759         struct net_device *lowerdev = vlan->lowerdev;
 760
 761         if (dev->flags & IFF_UP) {
 762                 if (change & IFF_ALLMULTI)
 763                         dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 764                 if (change & IFF_PROMISC)
 765                         dev_set_promiscuity(lowerdev,
 766                                             dev->flags & IFF_PROMISC ? 1 : -1);
 767
 768         }
 769 }
 770
 771 static void macvlan_compute_filter(unsigned long *mc_filter,
 772                                    struct net_device *dev,
 773                                    struct macvlan_dev *vlan)
 774 {
 775         if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
 776                 bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ);
 777         } else {
 778                 struct netdev_hw_addr *ha;
 779                 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
 780
 781                 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
 782                 netdev_for_each_mc_addr(ha, dev) {
 783                         __set_bit(mc_hash(vlan, ha->addr), filter);
 784                 }
 785
 786                 __set_bit(mc_hash(vlan, dev->broadcast), filter);
 787
 788                 bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ);
 789         }
 790 }
 791
 792 static void macvlan_set_mac_lists(struct net_device *dev)
 793 {
 794         struct macvlan_dev *vlan = netdev_priv(dev);
 795
 796         macvlan_compute_filter(vlan->mc_filter, dev, vlan);
 797
 798         dev_uc_sync(vlan->lowerdev, dev);
 799         dev_mc_sync(vlan->lowerdev, dev);
 800
 801         /* This is slightly inaccurate as we're including the subscription
 802          * list of vlan->lowerdev too.
 803          *
 804          * Bug alert: This only works if everyone has the same broadcast
 805          * address as lowerdev.  As soon as someone changes theirs this
 806          * will break.
 807          *
 808          * However, this is already broken as when you change your broadcast
 809          * address we don't get called.
 810          *
 811          * The solution is to maintain a list of broadcast addresses like
 812          * we do for uc/mc, if you care.
 813          */
 814         macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL);
 815 }
 816
 817 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
 818 {
 819         struct macvlan_dev *vlan = netdev_priv(dev);
 820
 821         if (vlan->lowerdev->mtu < new_mtu)
 822                 return -EINVAL;
 823         dev->mtu = new_mtu;
 824         return 0;
 825 }
 826
 827 static int macvlan_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 828 {
 829         struct net_device *real_dev = macvlan_dev_real_dev(dev);
 830         const struct net_device_ops *ops = real_dev->netdev_ops;
 831         struct ifreq ifrr;
 832         int err = -EOPNOTSUPP;
 833
 834         strscpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
 835         ifrr.ifr_ifru = ifr->ifr_ifru;
 836
 837         switch (cmd) {
 838         case SIOCSHWTSTAMP:
 839                 if (!net_eq(dev_net(dev), &init_net))
 840                         break;
 841                 /* fall through */
 842         case SIOCGHWTSTAMP:
 843                 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
 844                         err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
 845                 break;
 846         }
 847
 848         if (!err)
 849                 ifr->ifr_ifru = ifrr.ifr_ifru;
 850
 851         return err;
 852 }
 853
 854 /*
 855  * macvlan network devices have devices nesting below it and are a special
 856  * "super class" of normal network devices; split their locks off into a
 857  * separate class since they always nest.
 858  */
 859 #define ALWAYS_ON_OFFLOADS \
 860         (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | \
 861          NETIF_F_GSO_ROBUST | NETIF_F_GSO_ENCAP_ALL)
 862
 863 #define ALWAYS_ON_FEATURES (ALWAYS_ON_OFFLOADS | NETIF_F_LLTX)
 864
 865 #define MACVLAN_FEATURES \
 866         (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
 867          NETIF_F_GSO | NETIF_F_TSO | NETIF_F_LRO | \
 868          NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
 869          NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
 870
 871 #define MACVLAN_STATE_MASK \
 872         ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
 873
 874 static int macvlan_init(struct net_device *dev)
 875 {
 876         struct macvlan_dev *vlan = netdev_priv(dev);
 877         const struct net_device *lowerdev = vlan->lowerdev;
 878         struct macvlan_port *port = vlan->port;
 879
 880         dev->state              = (dev->state & ~MACVLAN_STATE_MASK) |
 881                                   (lowerdev->state & MACVLAN_STATE_MASK);
 882         dev->features           = lowerdev->features & MACVLAN_FEATURES;
 883         dev->features           |= ALWAYS_ON_FEATURES;
 884         dev->hw_features        |= NETIF_F_LRO;
 885         dev->vlan_features      = lowerdev->vlan_features & MACVLAN_FEATURES;
 886         dev->vlan_features      |= ALWAYS_ON_OFFLOADS;
 887         dev->hw_enc_features    |= dev->features;
 888         dev->gso_max_size       = lowerdev->gso_max_size;
 889         dev->gso_max_segs       = lowerdev->gso_max_segs;
 890         dev->hard_header_len    = lowerdev->hard_header_len;
 891
 892         vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
 893         if (!vlan->pcpu_stats)
 894                 return -ENOMEM;
 895
 896         port->count += 1;
 897
 898         return 0;
 899 }
 900
 901 static void macvlan_uninit(struct net_device *dev)
 902 {
 903         struct macvlan_dev *vlan = netdev_priv(dev);
 904         struct macvlan_port *port = vlan->port;
 905
 906         free_percpu(vlan->pcpu_stats);
 907
 908         macvlan_flush_sources(port, vlan);
 909         port->count -= 1;
 910         if (!port->count)
 911                 macvlan_port_destroy(port->dev);
 912 }
 913
 914 static void macvlan_dev_get_stats64(struct net_device *dev,
 915                                     struct rtnl_link_stats64 *stats)
 916 {
 917         struct macvlan_dev *vlan = netdev_priv(dev);
 918
 919         if (vlan->pcpu_stats) {
 920                 struct vlan_pcpu_stats *p;
 921                 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
 922                 u32 rx_errors = 0, tx_dropped = 0;
 923                 unsigned int start;
 924                 int i;
 925
 926                 for_each_possible_cpu(i) {
 927                         p = per_cpu_ptr(vlan->pcpu_stats, i);
 928                         do {
 929                                 start = u64_stats_fetch_begin_irq(&p->syncp);
 930                                 rx_packets      = p->rx_packets;
 931                                 rx_bytes        = p->rx_bytes;
 932                                 rx_multicast    = p->rx_multicast;
 933                                 tx_packets      = p->tx_packets;
 934                                 tx_bytes        = p->tx_bytes;
 935                         } while (u64_stats_fetch_retry_irq(&p->syncp, start));
 936
 937                         stats->rx_packets       += rx_packets;
 938                         stats->rx_bytes         += rx_bytes;
 939                         stats->multicast        += rx_multicast;
 940                         stats->tx_packets       += tx_packets;
 941                         stats->tx_bytes         += tx_bytes;
 942                         /* rx_errors & tx_dropped are u32, updated
 943                          * without syncp protection.
 944                          */
 945                         rx_errors       += p->rx_errors;
 946                         tx_dropped      += p->tx_dropped;
 947                 }
 948                 stats->rx_errors        = rx_errors;
 949                 stats->rx_dropped       = rx_errors;
 950                 stats->tx_dropped       = tx_dropped;
 951         }
 952 }
 953
 954 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
 955                                    __be16 proto, u16 vid)
 956 {
 957         struct macvlan_dev *vlan = netdev_priv(dev);
 958         struct net_device *lowerdev = vlan->lowerdev;
 959
 960         return vlan_vid_add(lowerdev, proto, vid);
 961 }
 962
 963 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
 964                                     __be16 proto, u16 vid)
 965 {
 966         struct macvlan_dev *vlan = netdev_priv(dev);
 967         struct net_device *lowerdev = vlan->lowerdev;
 968
 969         vlan_vid_del(lowerdev, proto, vid);
 970         return 0;
 971 }
 972
 973 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 974                            struct net_device *dev,
 975                            const unsigned char *addr, u16 vid,
 976                            u16 flags,
 977                            struct netlink_ext_ack *extack)
 978 {
 979         struct macvlan_dev *vlan = netdev_priv(dev);
 980         int err = -EINVAL;
 981
 982         /* Support unicast filter only on passthru devices.
 983          * Multicast filter should be allowed on all devices.
 984          */
 985         if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
 986                 return -EOPNOTSUPP;
 987
 988         if (flags & NLM_F_REPLACE)
 989                 return -EOPNOTSUPP;
 990
 991         if (is_unicast_ether_addr(addr))
 992                 err = dev_uc_add_excl(dev, addr);
 993         else if (is_multicast_ether_addr(addr))
 994                 err = dev_mc_add_excl(dev, addr);
 995
 996         return err;
 997 }
 998
 999 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
1000                            struct net_device *dev,
1001                            const unsigned char *addr, u16 vid)
1002 {
1003         struct macvlan_dev *vlan = netdev_priv(dev);
1004         int err = -EINVAL;
1005
1006         /* Support unicast filter only on passthru devices.
1007          * Multicast filter should be allowed on all devices.
1008          */
1009         if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
1010                 return -EOPNOTSUPP;
1011
1012         if (is_unicast_ether_addr(addr))
1013                 err = dev_uc_del(dev, addr);
1014         else if (is_multicast_ether_addr(addr))
1015                 err = dev_mc_del(dev, addr);
1016
1017         return err;
1018 }
1019
1020 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
1021                                         struct ethtool_drvinfo *drvinfo)
1022 {
1023         strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
1024         strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
1025 }
1026
1027 static int macvlan_ethtool_get_link_ksettings(struct net_device *dev,
1028                                               struct ethtool_link_ksettings *cmd)
1029 {
1030         const struct macvlan_dev *vlan = netdev_priv(dev);
1031
1032         return __ethtool_get_link_ksettings(vlan->lowerdev, cmd);
1033 }
1034
1035 static int macvlan_ethtool_get_ts_info(struct net_device *dev,
1036                                        struct ethtool_ts_info *info)
1037 {
1038         struct net_device *real_dev = macvlan_dev_real_dev(dev);
1039         const struct ethtool_ops *ops = real_dev->ethtool_ops;
1040         struct phy_device *phydev = real_dev->phydev;
1041
1042         if (phy_has_tsinfo(phydev)) {
1043                 return phy_ts_info(phydev, info);
1044         } else if (ops->get_ts_info) {
1045                 return ops->get_ts_info(real_dev, info);
1046         } else {
1047                 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
1048                         SOF_TIMESTAMPING_SOFTWARE;
1049                 info->phc_index = -1;
1050         }
1051
1052         return 0;
1053 }
1054
1055 static netdev_features_t macvlan_fix_features(struct net_device *dev,
1056                                               netdev_features_t features)
1057 {
1058         struct macvlan_dev *vlan = netdev_priv(dev);
1059         netdev_features_t lowerdev_features = vlan->lowerdev->features;
1060         netdev_features_t mask;
1061
1062         features |= NETIF_F_ALL_FOR_ALL;
1063         features &= (vlan->set_features | ~MACVLAN_FEATURES);
1064         mask = features;
1065
1066         lowerdev_features &= (features | ~NETIF_F_LRO);
1067         features = netdev_increment_features(lowerdev_features, features, mask);
1068         features |= ALWAYS_ON_FEATURES;
1069         features &= (ALWAYS_ON_FEATURES | MACVLAN_FEATURES);
1070
1071         return features;
1072 }
1073
1074 #ifdef CONFIG_NET_POLL_CONTROLLER
1075 static void macvlan_dev_poll_controller(struct net_device *dev)
1076 {
1077         return;
1078 }
1079
1080 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
1081 {
1082         struct macvlan_dev *vlan = netdev_priv(dev);
1083         struct net_device *real_dev = vlan->lowerdev;
1084         struct netpoll *netpoll;
1085         int err = 0;
1086
1087         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
1088         err = -ENOMEM;
1089         if (!netpoll)
1090                 goto out;
1091
1092         err = __netpoll_setup(netpoll, real_dev);
1093         if (err) {
1094                 kfree(netpoll);
1095                 goto out;
1096         }
1097
1098         vlan->netpoll = netpoll;
1099
1100 out:
1101         return err;
1102 }
1103
1104 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
1105 {
1106         struct macvlan_dev *vlan = netdev_priv(dev);
1107         struct netpoll *netpoll = vlan->netpoll;
1108
1109         if (!netpoll)
1110                 return;
1111
1112         vlan->netpoll = NULL;
1113
1114         __netpoll_free(netpoll);
1115 }
1116 #endif  /* CONFIG_NET_POLL_CONTROLLER */
1117
1118 static int macvlan_dev_get_iflink(const struct net_device *dev)
1119 {
1120         struct macvlan_dev *vlan = netdev_priv(dev);
1121
1122         return vlan->lowerdev->ifindex;
1123 }
1124
1125 static const struct ethtool_ops macvlan_ethtool_ops = {
1126         .get_link               = ethtool_op_get_link,
1127         .get_link_ksettings     = macvlan_ethtool_get_link_ksettings,
1128         .get_drvinfo            = macvlan_ethtool_get_drvinfo,
1129         .get_ts_info            = macvlan_ethtool_get_ts_info,
1130 };
1131
1132 static const struct net_device_ops macvlan_netdev_ops = {
1133         .ndo_init               = macvlan_init,
1134         .ndo_uninit             = macvlan_uninit,
1135         .ndo_open               = macvlan_open,
1136         .ndo_stop               = macvlan_stop,
1137         .ndo_start_xmit         = macvlan_start_xmit,
1138         .ndo_change_mtu         = macvlan_change_mtu,
1139         .ndo_do_ioctl           = macvlan_do_ioctl,
1140         .ndo_fix_features       = macvlan_fix_features,
1141         .ndo_change_rx_flags    = macvlan_change_rx_flags,
1142         .ndo_set_mac_address    = macvlan_set_mac_address,
1143         .ndo_set_rx_mode        = macvlan_set_mac_lists,
1144         .ndo_get_stats64        = macvlan_dev_get_stats64,
1145         .ndo_validate_addr      = eth_validate_addr,
1146         .ndo_vlan_rx_add_vid    = macvlan_vlan_rx_add_vid,
1147         .ndo_vlan_rx_kill_vid   = macvlan_vlan_rx_kill_vid,
1148         .ndo_fdb_add            = macvlan_fdb_add,
1149         .ndo_fdb_del            = macvlan_fdb_del,
1150         .ndo_fdb_dump           = ndo_dflt_fdb_dump,
1151 #ifdef CONFIG_NET_POLL_CONTROLLER
1152         .ndo_poll_controller    = macvlan_dev_poll_controller,
1153         .ndo_netpoll_setup      = macvlan_dev_netpoll_setup,
1154         .ndo_netpoll_cleanup    = macvlan_dev_netpoll_cleanup,
1155 #endif
1156         .ndo_get_iflink         = macvlan_dev_get_iflink,
1157         .ndo_features_check     = passthru_features_check,
1158         .ndo_change_proto_down  = dev_change_proto_down_generic,
1159 };
1160
1161 void macvlan_common_setup(struct net_device *dev)
1162 {
1163         ether_setup(dev);
1164
1165         dev->min_mtu            = 0;
1166         dev->max_mtu            = ETH_MAX_MTU;
1167         dev->priv_flags        &= ~IFF_TX_SKB_SHARING;
1168         netif_keep_dst(dev);
1169         dev->priv_flags        |= IFF_UNICAST_FLT;
1170         dev->netdev_ops         = &macvlan_netdev_ops;
1171         dev->needs_free_netdev  = true;
1172         dev->header_ops         = &macvlan_hard_header_ops;
1173         dev->ethtool_ops        = &macvlan_ethtool_ops;
1174 }
1175 EXPORT_SYMBOL_GPL(macvlan_common_setup);
1176
1177 static void macvlan_setup(struct net_device *dev)
1178 {
1179         macvlan_common_setup(dev);
1180         dev->priv_flags |= IFF_NO_QUEUE;
1181 }
1182
1183 static int macvlan_port_create(struct net_device *dev)
1184 {
1185         struct macvlan_port *port;
1186         unsigned int i;
1187         int err;
1188
1189         if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1190                 return -EINVAL;
1191
1192         if (netdev_is_rx_handler_busy(dev))
1193                 return -EBUSY;
1194
1195         port = kzalloc(sizeof(*port), GFP_KERNEL);
1196         if (port == NULL)
1197                 return -ENOMEM;
1198
1199         port->dev = dev;
1200         ether_addr_copy(port->perm_addr, dev->dev_addr);
1201         INIT_LIST_HEAD(&port->vlans);
1202         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1203                 INIT_HLIST_HEAD(&port->vlan_hash[i]);
1204         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1205                 INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1206
1207         skb_queue_head_init(&port->bc_queue);
1208         INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1209
1210         err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1211         if (err)
1212                 kfree(port);
1213         else
1214                 dev->priv_flags |= IFF_MACVLAN_PORT;
1215         return err;
1216 }
1217
1218 static void macvlan_port_destroy(struct net_device *dev)
1219 {
1220         struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1221         struct sk_buff *skb;
1222
1223         dev->priv_flags &= ~IFF_MACVLAN_PORT;
1224         netdev_rx_handler_unregister(dev);
1225
1226         /* After this point, no packet can schedule bc_work anymore,
1227          * but we need to cancel it and purge left skbs if any.
1228          */
1229         cancel_work_sync(&port->bc_work);
1230
1231         while ((skb = __skb_dequeue(&port->bc_queue))) {
1232                 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
1233
1234                 if (src)
1235                         dev_put(src->dev);
1236
1237                 kfree_skb(skb);
1238         }
1239
1240         /* If the lower device address has been changed by passthru
1241          * macvlan, put it back.
1242          */
1243         if (macvlan_passthru(port) &&
1244             !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) {
1245                 struct sockaddr sa;
1246
1247                 sa.sa_family = port->dev->type;
1248                 memcpy(&sa.sa_data, port->perm_addr, port->dev->addr_len);
1249                 dev_set_mac_address(port->dev, &sa, NULL);
1250         }
1251
1252         kfree(port);
1253 }
1254
1255 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[],
1256                             struct netlink_ext_ack *extack)
1257 {
1258         if (tb[IFLA_ADDRESS]) {
1259                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1260                         return -EINVAL;
1261                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1262                         return -EADDRNOTAVAIL;
1263         }
1264
1265         if (!data)
1266                 return 0;
1267
1268         if (data[IFLA_MACVLAN_FLAGS] &&
1269             nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
1270                 return -EINVAL;
1271
1272         if (data[IFLA_MACVLAN_MODE]) {
1273                 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1274                 case MACVLAN_MODE_PRIVATE:
1275                 case MACVLAN_MODE_VEPA:
1276                 case MACVLAN_MODE_BRIDGE:
1277                 case MACVLAN_MODE_PASSTHRU:
1278                 case MACVLAN_MODE_SOURCE:
1279                         break;
1280                 default:
1281                         return -EINVAL;
1282                 }
1283         }
1284
1285         if (data[IFLA_MACVLAN_MACADDR_MODE]) {
1286                 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1287                 case MACVLAN_MACADDR_ADD:
1288                 case MACVLAN_MACADDR_DEL:
1289                 case MACVLAN_MACADDR_FLUSH:
1290                 case MACVLAN_MACADDR_SET:
1291                         break;
1292                 default:
1293                         return -EINVAL;
1294                 }
1295         }
1296
1297         if (data[IFLA_MACVLAN_MACADDR]) {
1298                 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1299                         return -EINVAL;
1300
1301                 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1302                         return -EADDRNOTAVAIL;
1303         }
1304
1305         if (data[IFLA_MACVLAN_MACADDR_COUNT])
1306                 return -EINVAL;
1307
1308         return 0;
1309 }
1310
1311 /**
1312  * reconfigure list of remote source mac address
1313  * (only for macvlan devices in source mode)
1314  * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1315  * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1316  */
1317 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1318                                       struct nlattr *data[])
1319 {
1320         char *addr = NULL;
1321         int ret, rem, len;
1322         struct nlattr *nla, *head;
1323         struct macvlan_source_entry *entry;
1324
1325         if (data[IFLA_MACVLAN_MACADDR])
1326                 addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1327
1328         if (mode == MACVLAN_MACADDR_ADD) {
1329                 if (!addr)
1330                         return -EINVAL;
1331
1332                 return macvlan_hash_add_source(vlan, addr);
1333
1334         } else if (mode == MACVLAN_MACADDR_DEL) {
1335                 if (!addr)
1336                         return -EINVAL;
1337
1338                 entry = macvlan_hash_lookup_source(vlan, addr);
1339                 if (entry) {
1340                         macvlan_hash_del_source(entry);
1341                         vlan->macaddr_count--;
1342                 }
1343         } else if (mode == MACVLAN_MACADDR_FLUSH) {
1344                 macvlan_flush_sources(vlan->port, vlan);
1345         } else if (mode == MACVLAN_MACADDR_SET) {
1346                 macvlan_flush_sources(vlan->port, vlan);
1347
1348                 if (addr) {
1349                         ret = macvlan_hash_add_source(vlan, addr);
1350                         if (ret)
1351                                 return ret;
1352                 }
1353
1354                 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA])
1355                         return 0;
1356
1357                 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1358                 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1359
1360                 nla_for_each_attr(nla, head, len, rem) {
1361                         if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1362                             nla_len(nla) != ETH_ALEN)
1363                                 continue;
1364
1365                         addr = nla_data(nla);
1366                         ret = macvlan_hash_add_source(vlan, addr);
1367                         if (ret)
1368                                 return ret;
1369                 }
1370         } else {
1371                 return -EINVAL;
1372         }
1373
1374         return 0;
1375 }
1376
1377 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1378                            struct nlattr *tb[], struct nlattr *data[],
1379                            struct netlink_ext_ack *extack)
1380 {
1381         struct macvlan_dev *vlan = netdev_priv(dev);
1382         struct macvlan_port *port;
1383         struct net_device *lowerdev;
1384         int err;
1385         int macmode;
1386         bool create = false;
1387
1388         if (!tb[IFLA_LINK])
1389                 return -EINVAL;
1390
1391         lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1392         if (lowerdev == NULL)
1393                 return -ENODEV;
1394
1395         /* When creating macvlans or macvtaps on top of other macvlans - use
1396          * the real device as the lowerdev.
1397          */
1398         if (netif_is_macvlan(lowerdev))
1399                 lowerdev = macvlan_dev_real_dev(lowerdev);
1400
1401         if (!tb[IFLA_MTU])
1402                 dev->mtu = lowerdev->mtu;
1403         else if (dev->mtu > lowerdev->mtu)
1404                 return -EINVAL;
1405
1406         /* MTU range: 68 - lowerdev->max_mtu */
1407         dev->min_mtu = ETH_MIN_MTU;
1408         dev->max_mtu = lowerdev->max_mtu;
1409
1410         if (!tb[IFLA_ADDRESS])
1411                 eth_hw_addr_random(dev);
1412
1413         if (!netif_is_macvlan_port(lowerdev)) {
1414                 err = macvlan_port_create(lowerdev);
1415                 if (err < 0)
1416                         return err;
1417                 create = true;
1418         }
1419         port = macvlan_port_get_rtnl(lowerdev);
1420
1421         /* Only 1 macvlan device can be created in passthru mode */
1422         if (macvlan_passthru(port)) {
1423                 /* The macvlan port must be not created this time,
1424                  * still goto destroy_macvlan_port for readability.
1425                  */
1426                 err = -EINVAL;
1427                 goto destroy_macvlan_port;
1428         }
1429
1430         vlan->lowerdev = lowerdev;
1431         vlan->dev      = dev;
1432         vlan->port     = port;
1433         vlan->set_features = MACVLAN_FEATURES;
1434
1435         vlan->mode     = MACVLAN_MODE_VEPA;
1436         if (data && data[IFLA_MACVLAN_MODE])
1437                 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1438
1439         if (data && data[IFLA_MACVLAN_FLAGS])
1440                 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1441
1442         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1443                 if (port->count) {
1444                         err = -EINVAL;
1445                         goto destroy_macvlan_port;
1446                 }
1447                 macvlan_set_passthru(port);
1448                 eth_hw_addr_inherit(dev, lowerdev);
1449         }
1450
1451         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1452                 if (vlan->mode != MACVLAN_MODE_SOURCE) {
1453                         err = -EINVAL;
1454                         goto destroy_macvlan_port;
1455                 }
1456                 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1457                 err = macvlan_changelink_sources(vlan, macmode, data);
1458                 if (err)
1459                         goto destroy_macvlan_port;
1460         }
1461
1462         err = register_netdevice(dev);
1463         if (err < 0)
1464                 goto destroy_macvlan_port;
1465
1466         dev->priv_flags |= IFF_MACVLAN;
1467         err = netdev_upper_dev_link(lowerdev, dev, extack);
1468         if (err)
1469                 goto unregister_netdev;
1470
1471         list_add_tail_rcu(&vlan->list, &port->vlans);
1472         netif_stacked_transfer_operstate(lowerdev, dev);
1473         linkwatch_fire_event(dev);
1474
1475         return 0;
1476
1477 unregister_netdev:
1478         /* macvlan_uninit would free the macvlan port */
1479         unregister_netdevice(dev);
1480         return err;
1481 destroy_macvlan_port:
1482         /* the macvlan port may be freed by macvlan_uninit when fail to register.
1483          * so we destroy the macvlan port only when it's valid.
1484          */
1485         if (create && macvlan_port_get_rtnl(lowerdev))
1486                 macvlan_port_destroy(port->dev);
1487         return err;
1488 }
1489 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1490
1491 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1492                            struct nlattr *tb[], struct nlattr *data[],
1493                            struct netlink_ext_ack *extack)
1494 {
1495         return macvlan_common_newlink(src_net, dev, tb, data, extack);
1496 }
1497
1498 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1499 {
1500         struct macvlan_dev *vlan = netdev_priv(dev);
1501
1502         if (vlan->mode == MACVLAN_MODE_SOURCE)
1503                 macvlan_flush_sources(vlan->port, vlan);
1504         list_del_rcu(&vlan->list);
1505         unregister_netdevice_queue(dev, head);
1506         netdev_upper_dev_unlink(vlan->lowerdev, dev);
1507 }
1508 EXPORT_SYMBOL_GPL(macvlan_dellink);
1509
1510 static int macvlan_changelink(struct net_device *dev,
1511                               struct nlattr *tb[], struct nlattr *data[],
1512                               struct netlink_ext_ack *extack)
1513 {
1514         struct macvlan_dev *vlan = netdev_priv(dev);
1515         enum macvlan_mode mode;
1516         bool set_mode = false;
1517         enum macvlan_macaddr_mode macmode;
1518         int ret;
1519
1520         /* Validate mode, but don't set yet: setting flags may fail. */
1521         if (data && data[IFLA_MACVLAN_MODE]) {
1522                 set_mode = true;
1523                 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1524                 /* Passthrough mode can't be set or cleared dynamically */
1525                 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1526                     (vlan->mode == MACVLAN_MODE_PASSTHRU))
1527                         return -EINVAL;
1528                 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1529                     vlan->mode != mode)
1530                         macvlan_flush_sources(vlan->port, vlan);
1531         }
1532
1533         if (data && data[IFLA_MACVLAN_FLAGS]) {
1534                 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1535                 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1536                 if (macvlan_passthru(vlan->port) && promisc) {
1537                         int err;
1538
1539                         if (flags & MACVLAN_FLAG_NOPROMISC)
1540                                 err = dev_set_promiscuity(vlan->lowerdev, -1);
1541                         else
1542                                 err = dev_set_promiscuity(vlan->lowerdev, 1);
1543                         if (err < 0)
1544                                 return err;
1545                 }
1546                 vlan->flags = flags;
1547         }
1548         if (set_mode)
1549                 vlan->mode = mode;
1550         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1551                 if (vlan->mode != MACVLAN_MODE_SOURCE)
1552                         return -EINVAL;
1553                 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1554                 ret = macvlan_changelink_sources(vlan, macmode, data);
1555                 if (ret)
1556                         return ret;
1557         }
1558         return 0;
1559 }
1560
1561 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1562 {
1563         if (vlan->macaddr_count == 0)
1564                 return 0;
1565         return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1566                 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1567 }
1568
1569 static size_t macvlan_get_size(const struct net_device *dev)
1570 {
1571         struct macvlan_dev *vlan = netdev_priv(dev);
1572
1573         return (0
1574                 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1575                 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1576                 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1577                 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1578                 );
1579 }
1580
1581 static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1582                                      const struct macvlan_dev *vlan,
1583                                      const int i)
1584 {
1585         struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1586         struct macvlan_source_entry *entry;
1587
1588         hlist_for_each_entry_rcu(entry, h, hlist) {
1589                 if (entry->vlan != vlan)
1590                         continue;
1591                 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1592                         return 1;
1593         }
1594         return 0;
1595 }
1596
1597 static int macvlan_fill_info(struct sk_buff *skb,
1598                                 const struct net_device *dev)
1599 {
1600         struct macvlan_dev *vlan = netdev_priv(dev);
1601         int i;
1602         struct nlattr *nest;
1603
1604         if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1605                 goto nla_put_failure;
1606         if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1607                 goto nla_put_failure;
1608         if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1609                 goto nla_put_failure;
1610         if (vlan->macaddr_count > 0) {
1611                 nest = nla_nest_start_noflag(skb, IFLA_MACVLAN_MACADDR_DATA);
1612                 if (nest == NULL)
1613                         goto nla_put_failure;
1614
1615                 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1616                         if (macvlan_fill_info_macaddr(skb, vlan, i))
1617                                 goto nla_put_failure;
1618                 }
1619                 nla_nest_end(skb, nest);
1620         }
1621         return 0;
1622
1623 nla_put_failure:
1624         return -EMSGSIZE;
1625 }
1626
1627 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1628         [IFLA_MACVLAN_MODE]  = { .type = NLA_U32 },
1629         [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1630         [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1631         [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1632         [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1633         [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1634 };
1635
1636 int macvlan_link_register(struct rtnl_link_ops *ops)
1637 {
1638         /* common fields */
1639         ops->validate           = macvlan_validate;
1640         ops->maxtype            = IFLA_MACVLAN_MAX;
1641         ops->policy             = macvlan_policy;
1642         ops->changelink         = macvlan_changelink;
1643         ops->get_size           = macvlan_get_size;
1644         ops->fill_info          = macvlan_fill_info;
1645
1646         return rtnl_link_register(ops);
1647 };
1648 EXPORT_SYMBOL_GPL(macvlan_link_register);
1649
1650 static struct net *macvlan_get_link_net(const struct net_device *dev)
1651 {
1652         return dev_net(macvlan_dev_real_dev(dev));
1653 }
1654
1655 static struct rtnl_link_ops macvlan_link_ops = {
1656         .kind           = "macvlan",
1657         .setup          = macvlan_setup,
1658         .newlink        = macvlan_newlink,
1659         .dellink        = macvlan_dellink,
1660         .get_link_net   = macvlan_get_link_net,
1661         .priv_size      = sizeof(struct macvlan_dev),
1662 };
1663
1664 static int macvlan_device_event(struct notifier_block *unused,
1665                                 unsigned long event, void *ptr)
1666 {
1667         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1668         struct macvlan_dev *vlan, *next;
1669         struct macvlan_port *port;
1670         LIST_HEAD(list_kill);
1671
1672         if (!netif_is_macvlan_port(dev))
1673                 return NOTIFY_DONE;
1674
1675         port = macvlan_port_get_rtnl(dev);
1676
1677         switch (event) {
1678         case NETDEV_UP:
1679         case NETDEV_DOWN:
1680         case NETDEV_CHANGE:
1681                 list_for_each_entry(vlan, &port->vlans, list)
1682                         netif_stacked_transfer_operstate(vlan->lowerdev,
1683                                                          vlan->dev);
1684                 break;
1685         case NETDEV_FEAT_CHANGE:
1686                 list_for_each_entry(vlan, &port->vlans, list) {
1687                         vlan->dev->gso_max_size = dev->gso_max_size;
1688                         vlan->dev->gso_max_segs = dev->gso_max_segs;
1689                         netdev_update_features(vlan->dev);
1690                 }
1691                 break;
1692         case NETDEV_CHANGEMTU:
1693                 list_for_each_entry(vlan, &port->vlans, list) {
1694                         if (vlan->dev->mtu <= dev->mtu)
1695                                 continue;
1696                         dev_set_mtu(vlan->dev, dev->mtu);
1697                 }
1698                 break;
1699         case NETDEV_CHANGEADDR:
1700                 if (!macvlan_passthru(port))
1701                         return NOTIFY_DONE;
1702
1703                 vlan = list_first_entry_or_null(&port->vlans,
1704                                                 struct macvlan_dev,
1705                                                 list);
1706
1707                 if (vlan && macvlan_sync_address(vlan->dev, dev->dev_addr))
1708                         return NOTIFY_BAD;
1709
1710                 break;
1711         case NETDEV_UNREGISTER:
1712                 /* twiddle thumbs on netns device moves */
1713                 if (dev->reg_state != NETREG_UNREGISTERING)
1714                         break;
1715
1716                 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1717                         vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1718                 unregister_netdevice_many(&list_kill);
1719                 break;
1720         case NETDEV_PRE_TYPE_CHANGE:
1721                 /* Forbid underlaying device to change its type. */
1722                 return NOTIFY_BAD;
1723
1724         case NETDEV_NOTIFY_PEERS:
1725         case NETDEV_BONDING_FAILOVER:
1726         case NETDEV_RESEND_IGMP:
1727                 /* Propagate to all vlans */
1728                 list_for_each_entry(vlan, &port->vlans, list)
1729                         call_netdevice_notifiers(event, vlan->dev);
1730         }
1731         return NOTIFY_DONE;
1732 }
1733
1734 static struct notifier_block macvlan_notifier_block __read_mostly = {
1735         .notifier_call  = macvlan_device_event,
1736 };
1737
1738 static int __init macvlan_init_module(void)
1739 {
1740         int err;
1741
1742         register_netdevice_notifier(&macvlan_notifier_block);
1743
1744         err = macvlan_link_register(&macvlan_link_ops);
1745         if (err < 0)
1746                 goto err1;
1747         return 0;
1748 err1:
1749         unregister_netdevice_notifier(&macvlan_notifier_block);
1750         return err;
1751 }
1752
1753 static void __exit macvlan_cleanup_module(void)
1754 {
1755         rtnl_link_unregister(&macvlan_link_ops);
1756         unregister_netdevice_notifier(&macvlan_notifier_block);
1757 }
1758
1759 module_init(macvlan_init_module);
1760 module_exit(macvlan_cleanup_module);
1761
1762 MODULE_LICENSE("GPL");
1763 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1764 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1765 MODULE_ALIAS_RTNL_LINK("macvlan");