linux/drivers/net/macvlan.c
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   1/*
   2 * Copyright (c) 2007 Patrick McHardy <kaber@trash.net>
   3 *
   4 * This program is free software; you can redistribute it and/or
   5 * modify it under the terms of the GNU General Public License as
   6 * published by the Free Software Foundation; either version 2 of
   7 * the License, or (at your option) any later version.
   8 *
   9 * The code this is based on carried the following copyright notice:
  10 * ---
  11 * (C) Copyright 2001-2006
  12 * Alex Zeffertt, Cambridge Broadband Ltd, ajz@cambridgebroadband.com
  13 * Re-worked by Ben Greear <greearb@candelatech.com>
  14 * ---
  15 */
  16#include <linux/kernel.h>
  17#include <linux/types.h>
  18#include <linux/module.h>
  19#include <linux/init.h>
  20#include <linux/errno.h>
  21#include <linux/slab.h>
  22#include <linux/string.h>
  23#include <linux/rculist.h>
  24#include <linux/notifier.h>
  25#include <linux/netdevice.h>
  26#include <linux/etherdevice.h>
  27#include <linux/ethtool.h>
  28#include <linux/if_arp.h>
  29#include <linux/if_vlan.h>
  30#include <linux/if_link.h>
  31#include <linux/if_macvlan.h>
  32#include <linux/hash.h>
  33#include <net/rtnetlink.h>
  34#include <net/xfrm.h>
  35
  36#define MACVLAN_HASH_SIZE       (1 << BITS_PER_BYTE)
  37
  38struct macvlan_port {
  39        struct net_device       *dev;
  40        struct hlist_head       vlan_hash[MACVLAN_HASH_SIZE];
  41        struct list_head        vlans;
  42        struct rcu_head         rcu;
  43        bool                    passthru;
  44        int                     count;
  45};
  46
  47static void macvlan_port_destroy(struct net_device *dev);
  48
  49static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev)
  50{
  51        return rcu_dereference(dev->rx_handler_data);
  52}
  53
  54static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev)
  55{
  56        return rtnl_dereference(dev->rx_handler_data);
  57}
  58
  59#define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT)
  60
  61static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
  62                                               const unsigned char *addr)
  63{
  64        struct macvlan_dev *vlan;
  65
  66        hlist_for_each_entry_rcu(vlan, &port->vlan_hash[addr[5]], hlist) {
  67                if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr))
  68                        return vlan;
  69        }
  70        return NULL;
  71}
  72
  73static void macvlan_hash_add(struct macvlan_dev *vlan)
  74{
  75        struct macvlan_port *port = vlan->port;
  76        const unsigned char *addr = vlan->dev->dev_addr;
  77
  78        hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]);
  79}
  80
  81static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
  82{
  83        hlist_del_rcu(&vlan->hlist);
  84        if (sync)
  85                synchronize_rcu();
  86}
  87
  88static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
  89                                        const unsigned char *addr)
  90{
  91        macvlan_hash_del(vlan, true);
  92        /* Now that we are unhashed it is safe to change the device
  93         * address without confusing packet delivery.
  94         */
  95        memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
  96        macvlan_hash_add(vlan);
  97}
  98
  99static int macvlan_addr_busy(const struct macvlan_port *port,
 100                                const unsigned char *addr)
 101{
 102        /* Test to see if the specified multicast address is
 103         * currently in use by the underlying device or
 104         * another macvlan.
 105         */
 106        if (ether_addr_equal_64bits(port->dev->dev_addr, addr))
 107                return 1;
 108
 109        if (macvlan_hash_lookup(port, addr))
 110                return 1;
 111
 112        return 0;
 113}
 114
 115
 116static int macvlan_broadcast_one(struct sk_buff *skb,
 117                                 const struct macvlan_dev *vlan,
 118                                 const struct ethhdr *eth, bool local)
 119{
 120        struct net_device *dev = vlan->dev;
 121
 122        if (local)
 123                return vlan->forward(dev, skb);
 124
 125        skb->dev = dev;
 126        if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
 127                skb->pkt_type = PACKET_BROADCAST;
 128        else
 129                skb->pkt_type = PACKET_MULTICAST;
 130
 131        return vlan->receive(skb);
 132}
 133
 134static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
 135{
 136        return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT);
 137}
 138
 139
 140static unsigned int mc_hash(const struct macvlan_dev *vlan,
 141                            const unsigned char *addr)
 142{
 143        u32 val = __get_unaligned_cpu32(addr + 2);
 144
 145        val ^= macvlan_hash_mix(vlan);
 146        return hash_32(val, MACVLAN_MC_FILTER_BITS);
 147}
 148
 149static void macvlan_broadcast(struct sk_buff *skb,
 150                              const struct macvlan_port *port,
 151                              struct net_device *src,
 152                              enum macvlan_mode mode)
 153{
 154        const struct ethhdr *eth = eth_hdr(skb);
 155        const struct macvlan_dev *vlan;
 156        struct sk_buff *nskb;
 157        unsigned int i;
 158        int err;
 159        unsigned int hash;
 160
 161        if (skb->protocol == htons(ETH_P_PAUSE))
 162                return;
 163
 164        for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
 165                hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) {
 166                        if (vlan->dev == src || !(vlan->mode & mode))
 167                                continue;
 168
 169                        hash = mc_hash(vlan, eth->h_dest);
 170                        if (!test_bit(hash, vlan->mc_filter))
 171                                continue;
 172
 173                        err = NET_RX_DROP;
 174                        nskb = skb_clone(skb, GFP_ATOMIC);
 175                        if (likely(nskb))
 176                                err = macvlan_broadcast_one(
 177                                        nskb, vlan, eth,
 178                                        mode == MACVLAN_MODE_BRIDGE);
 179                        macvlan_count_rx(vlan, skb->len + ETH_HLEN,
 180                                         err == NET_RX_SUCCESS, 1);
 181                }
 182        }
 183}
 184
 185/* called under rcu_read_lock() from netif_receive_skb */
 186static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
 187{
 188        struct macvlan_port *port;
 189        struct sk_buff *skb = *pskb;
 190        const struct ethhdr *eth = eth_hdr(skb);
 191        const struct macvlan_dev *vlan;
 192        const struct macvlan_dev *src;
 193        struct net_device *dev;
 194        unsigned int len = 0;
 195        int ret = NET_RX_DROP;
 196
 197        port = macvlan_port_get_rcu(skb->dev);
 198        if (is_multicast_ether_addr(eth->h_dest)) {
 199                skb = ip_check_defrag(skb, IP_DEFRAG_MACVLAN);
 200                if (!skb)
 201                        return RX_HANDLER_CONSUMED;
 202                eth = eth_hdr(skb);
 203                src = macvlan_hash_lookup(port, eth->h_source);
 204                if (!src)
 205                        /* frame comes from an external address */
 206                        macvlan_broadcast(skb, port, NULL,
 207                                          MACVLAN_MODE_PRIVATE |
 208                                          MACVLAN_MODE_VEPA    |
 209                                          MACVLAN_MODE_PASSTHRU|
 210                                          MACVLAN_MODE_BRIDGE);
 211                else if (src->mode == MACVLAN_MODE_VEPA)
 212                        /* flood to everyone except source */
 213                        macvlan_broadcast(skb, port, src->dev,
 214                                          MACVLAN_MODE_VEPA |
 215                                          MACVLAN_MODE_BRIDGE);
 216                else if (src->mode == MACVLAN_MODE_BRIDGE)
 217                        /*
 218                         * flood only to VEPA ports, bridge ports
 219                         * already saw the frame on the way out.
 220                         */
 221                        macvlan_broadcast(skb, port, src->dev,
 222                                          MACVLAN_MODE_VEPA);
 223                else {
 224                        /* forward to original port. */
 225                        vlan = src;
 226                        ret = macvlan_broadcast_one(skb, vlan, eth, 0);
 227                        goto out;
 228                }
 229
 230                return RX_HANDLER_PASS;
 231        }
 232
 233        if (port->passthru)
 234                vlan = list_first_or_null_rcu(&port->vlans,
 235                                              struct macvlan_dev, list);
 236        else
 237                vlan = macvlan_hash_lookup(port, eth->h_dest);
 238        if (vlan == NULL)
 239                return RX_HANDLER_PASS;
 240
 241        dev = vlan->dev;
 242        if (unlikely(!(dev->flags & IFF_UP))) {
 243                kfree_skb(skb);
 244                return RX_HANDLER_CONSUMED;
 245        }
 246        len = skb->len + ETH_HLEN;
 247        skb = skb_share_check(skb, GFP_ATOMIC);
 248        if (!skb)
 249                goto out;
 250
 251        skb->dev = dev;
 252        skb->pkt_type = PACKET_HOST;
 253
 254        ret = vlan->receive(skb);
 255
 256out:
 257        macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0);
 258        return RX_HANDLER_CONSUMED;
 259}
 260
 261static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
 262{
 263        const struct macvlan_dev *vlan = netdev_priv(dev);
 264        const struct macvlan_port *port = vlan->port;
 265        const struct macvlan_dev *dest;
 266        __u8 ip_summed = skb->ip_summed;
 267
 268        if (vlan->mode == MACVLAN_MODE_BRIDGE) {
 269                const struct ethhdr *eth = (void *)skb->data;
 270                skb->ip_summed = CHECKSUM_UNNECESSARY;
 271
 272                /* send to other bridge ports directly */
 273                if (is_multicast_ether_addr(eth->h_dest)) {
 274                        macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
 275                        goto xmit_world;
 276                }
 277
 278                dest = macvlan_hash_lookup(port, eth->h_dest);
 279                if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
 280                        /* send to lowerdev first for its network taps */
 281                        dev_forward_skb(vlan->lowerdev, skb);
 282
 283                        return NET_XMIT_SUCCESS;
 284                }
 285        }
 286
 287xmit_world:
 288        skb->ip_summed = ip_summed;
 289        skb->dev = vlan->lowerdev;
 290        return dev_queue_xmit(skb);
 291}
 292
 293netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
 294                               struct net_device *dev)
 295{
 296        unsigned int len = skb->len;
 297        int ret;
 298        const struct macvlan_dev *vlan = netdev_priv(dev);
 299
 300        ret = macvlan_queue_xmit(skb, dev);
 301        if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 302                struct macvlan_pcpu_stats *pcpu_stats;
 303
 304                pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
 305                u64_stats_update_begin(&pcpu_stats->syncp);
 306                pcpu_stats->tx_packets++;
 307                pcpu_stats->tx_bytes += len;
 308                u64_stats_update_end(&pcpu_stats->syncp);
 309        } else {
 310                this_cpu_inc(vlan->pcpu_stats->tx_dropped);
 311        }
 312        return ret;
 313}
 314EXPORT_SYMBOL_GPL(macvlan_start_xmit);
 315
 316static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
 317                               unsigned short type, const void *daddr,
 318                               const void *saddr, unsigned len)
 319{
 320        const struct macvlan_dev *vlan = netdev_priv(dev);
 321        struct net_device *lowerdev = vlan->lowerdev;
 322
 323        return dev_hard_header(skb, lowerdev, type, daddr,
 324                               saddr ? : dev->dev_addr, len);
 325}
 326
 327static const struct header_ops macvlan_hard_header_ops = {
 328        .create         = macvlan_hard_header,
 329        .rebuild        = eth_rebuild_header,
 330        .parse          = eth_header_parse,
 331        .cache          = eth_header_cache,
 332        .cache_update   = eth_header_cache_update,
 333};
 334
 335static int macvlan_open(struct net_device *dev)
 336{
 337        struct macvlan_dev *vlan = netdev_priv(dev);
 338        struct net_device *lowerdev = vlan->lowerdev;
 339        int err;
 340
 341        if (vlan->port->passthru) {
 342                if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
 343                        err = dev_set_promiscuity(lowerdev, 1);
 344                        if (err < 0)
 345                                goto out;
 346                }
 347                goto hash_add;
 348        }
 349
 350        err = -EBUSY;
 351        if (macvlan_addr_busy(vlan->port, dev->dev_addr))
 352                goto out;
 353
 354        err = dev_uc_add(lowerdev, dev->dev_addr);
 355        if (err < 0)
 356                goto out;
 357        if (dev->flags & IFF_ALLMULTI) {
 358                err = dev_set_allmulti(lowerdev, 1);
 359                if (err < 0)
 360                        goto del_unicast;
 361        }
 362
 363hash_add:
 364        macvlan_hash_add(vlan);
 365        return 0;
 366
 367del_unicast:
 368        dev_uc_del(lowerdev, dev->dev_addr);
 369out:
 370        return err;
 371}
 372
 373static int macvlan_stop(struct net_device *dev)
 374{
 375        struct macvlan_dev *vlan = netdev_priv(dev);
 376        struct net_device *lowerdev = vlan->lowerdev;
 377
 378        dev_uc_unsync(lowerdev, dev);
 379        dev_mc_unsync(lowerdev, dev);
 380
 381        if (vlan->port->passthru) {
 382                if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
 383                        dev_set_promiscuity(lowerdev, -1);
 384                goto hash_del;
 385        }
 386
 387        if (dev->flags & IFF_ALLMULTI)
 388                dev_set_allmulti(lowerdev, -1);
 389
 390        dev_uc_del(lowerdev, dev->dev_addr);
 391
 392hash_del:
 393        macvlan_hash_del(vlan, !dev->dismantle);
 394        return 0;
 395}
 396
 397static int macvlan_set_mac_address(struct net_device *dev, void *p)
 398{
 399        struct macvlan_dev *vlan = netdev_priv(dev);
 400        struct net_device *lowerdev = vlan->lowerdev;
 401        struct sockaddr *addr = p;
 402        int err;
 403
 404        if (!is_valid_ether_addr(addr->sa_data))
 405                return -EADDRNOTAVAIL;
 406
 407        if (!(dev->flags & IFF_UP)) {
 408                /* Just copy in the new address */
 409                memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 410        } else {
 411                /* Rehash and update the device filters */
 412                if (macvlan_addr_busy(vlan->port, addr->sa_data))
 413                        return -EBUSY;
 414
 415                err = dev_uc_add(lowerdev, addr->sa_data);
 416                if (err)
 417                        return err;
 418
 419                dev_uc_del(lowerdev, dev->dev_addr);
 420
 421                macvlan_hash_change_addr(vlan, addr->sa_data);
 422        }
 423        return 0;
 424}
 425
 426static void macvlan_change_rx_flags(struct net_device *dev, int change)
 427{
 428        struct macvlan_dev *vlan = netdev_priv(dev);
 429        struct net_device *lowerdev = vlan->lowerdev;
 430
 431        if (change & IFF_ALLMULTI)
 432                dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 433}
 434
 435static void macvlan_set_mac_lists(struct net_device *dev)
 436{
 437        struct macvlan_dev *vlan = netdev_priv(dev);
 438
 439        if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
 440                bitmap_fill(vlan->mc_filter, MACVLAN_MC_FILTER_SZ);
 441        } else {
 442                struct netdev_hw_addr *ha;
 443                DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
 444
 445                bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
 446                netdev_for_each_mc_addr(ha, dev) {
 447                        __set_bit(mc_hash(vlan, ha->addr), filter);
 448                }
 449
 450                __set_bit(mc_hash(vlan, dev->broadcast), filter);
 451
 452                bitmap_copy(vlan->mc_filter, filter, MACVLAN_MC_FILTER_SZ);
 453        }
 454        dev_uc_sync(vlan->lowerdev, dev);
 455        dev_mc_sync(vlan->lowerdev, dev);
 456}
 457
 458static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
 459{
 460        struct macvlan_dev *vlan = netdev_priv(dev);
 461
 462        if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
 463                return -EINVAL;
 464        dev->mtu = new_mtu;
 465        return 0;
 466}
 467
 468/*
 469 * macvlan network devices have devices nesting below it and are a special
 470 * "super class" of normal network devices; split their locks off into a
 471 * separate class since they always nest.
 472 */
 473static struct lock_class_key macvlan_netdev_xmit_lock_key;
 474static struct lock_class_key macvlan_netdev_addr_lock_key;
 475
 476#define MACVLAN_FEATURES \
 477        (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
 478         NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
 479         NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
 480         NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
 481
 482#define MACVLAN_STATE_MASK \
 483        ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
 484
 485static void macvlan_set_lockdep_class_one(struct net_device *dev,
 486                                          struct netdev_queue *txq,
 487                                          void *_unused)
 488{
 489        lockdep_set_class(&txq->_xmit_lock,
 490                          &macvlan_netdev_xmit_lock_key);
 491}
 492
 493static void macvlan_set_lockdep_class(struct net_device *dev)
 494{
 495        lockdep_set_class(&dev->addr_list_lock,
 496                          &macvlan_netdev_addr_lock_key);
 497        netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
 498}
 499
 500static int macvlan_init(struct net_device *dev)
 501{
 502        struct macvlan_dev *vlan = netdev_priv(dev);
 503        const struct net_device *lowerdev = vlan->lowerdev;
 504
 505        dev->state              = (dev->state & ~MACVLAN_STATE_MASK) |
 506                                  (lowerdev->state & MACVLAN_STATE_MASK);
 507        dev->features           = lowerdev->features & MACVLAN_FEATURES;
 508        dev->features           |= NETIF_F_LLTX;
 509        dev->gso_max_size       = lowerdev->gso_max_size;
 510        dev->iflink             = lowerdev->ifindex;
 511        dev->hard_header_len    = lowerdev->hard_header_len;
 512
 513        macvlan_set_lockdep_class(dev);
 514
 515        vlan->pcpu_stats = alloc_percpu(struct macvlan_pcpu_stats);
 516        if (!vlan->pcpu_stats)
 517                return -ENOMEM;
 518
 519        return 0;
 520}
 521
 522static void macvlan_uninit(struct net_device *dev)
 523{
 524        struct macvlan_dev *vlan = netdev_priv(dev);
 525        struct macvlan_port *port = vlan->port;
 526
 527        free_percpu(vlan->pcpu_stats);
 528
 529        port->count -= 1;
 530        if (!port->count)
 531                macvlan_port_destroy(port->dev);
 532}
 533
 534static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
 535                                                         struct rtnl_link_stats64 *stats)
 536{
 537        struct macvlan_dev *vlan = netdev_priv(dev);
 538
 539        if (vlan->pcpu_stats) {
 540                struct macvlan_pcpu_stats *p;
 541                u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
 542                u32 rx_errors = 0, tx_dropped = 0;
 543                unsigned int start;
 544                int i;
 545
 546                for_each_possible_cpu(i) {
 547                        p = per_cpu_ptr(vlan->pcpu_stats, i);
 548                        do {
 549                                start = u64_stats_fetch_begin_bh(&p->syncp);
 550                                rx_packets      = p->rx_packets;
 551                                rx_bytes        = p->rx_bytes;
 552                                rx_multicast    = p->rx_multicast;
 553                                tx_packets      = p->tx_packets;
 554                                tx_bytes        = p->tx_bytes;
 555                        } while (u64_stats_fetch_retry_bh(&p->syncp, start));
 556
 557                        stats->rx_packets       += rx_packets;
 558                        stats->rx_bytes         += rx_bytes;
 559                        stats->multicast        += rx_multicast;
 560                        stats->tx_packets       += tx_packets;
 561                        stats->tx_bytes         += tx_bytes;
 562                        /* rx_errors & tx_dropped are u32, updated
 563                         * without syncp protection.
 564                         */
 565                        rx_errors       += p->rx_errors;
 566                        tx_dropped      += p->tx_dropped;
 567                }
 568                stats->rx_errors        = rx_errors;
 569                stats->rx_dropped       = rx_errors;
 570                stats->tx_dropped       = tx_dropped;
 571        }
 572        return stats;
 573}
 574
 575static int macvlan_vlan_rx_add_vid(struct net_device *dev,
 576                                   __be16 proto, u16 vid)
 577{
 578        struct macvlan_dev *vlan = netdev_priv(dev);
 579        struct net_device *lowerdev = vlan->lowerdev;
 580
 581        return vlan_vid_add(lowerdev, proto, vid);
 582}
 583
 584static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
 585                                    __be16 proto, u16 vid)
 586{
 587        struct macvlan_dev *vlan = netdev_priv(dev);
 588        struct net_device *lowerdev = vlan->lowerdev;
 589
 590        vlan_vid_del(lowerdev, proto, vid);
 591        return 0;
 592}
 593
 594static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 595                           struct net_device *dev,
 596                           const unsigned char *addr,
 597                           u16 flags)
 598{
 599        struct macvlan_dev *vlan = netdev_priv(dev);
 600        int err = -EINVAL;
 601
 602        if (!vlan->port->passthru)
 603                return -EOPNOTSUPP;
 604
 605        if (flags & NLM_F_REPLACE)
 606                return -EOPNOTSUPP;
 607
 608        if (is_unicast_ether_addr(addr))
 609                err = dev_uc_add_excl(dev, addr);
 610        else if (is_multicast_ether_addr(addr))
 611                err = dev_mc_add_excl(dev, addr);
 612
 613        return err;
 614}
 615
 616static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
 617                           struct net_device *dev,
 618                           const unsigned char *addr)
 619{
 620        struct macvlan_dev *vlan = netdev_priv(dev);
 621        int err = -EINVAL;
 622
 623        if (!vlan->port->passthru)
 624                return -EOPNOTSUPP;
 625
 626        if (is_unicast_ether_addr(addr))
 627                err = dev_uc_del(dev, addr);
 628        else if (is_multicast_ether_addr(addr))
 629                err = dev_mc_del(dev, addr);
 630
 631        return err;
 632}
 633
 634static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
 635                                        struct ethtool_drvinfo *drvinfo)
 636{
 637        strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
 638        strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
 639}
 640
 641static int macvlan_ethtool_get_settings(struct net_device *dev,
 642                                        struct ethtool_cmd *cmd)
 643{
 644        const struct macvlan_dev *vlan = netdev_priv(dev);
 645
 646        return __ethtool_get_settings(vlan->lowerdev, cmd);
 647}
 648
 649static netdev_features_t macvlan_fix_features(struct net_device *dev,
 650                                              netdev_features_t features)
 651{
 652        struct macvlan_dev *vlan = netdev_priv(dev);
 653
 654        return features & (vlan->set_features | ~MACVLAN_FEATURES);
 655}
 656
 657static const struct ethtool_ops macvlan_ethtool_ops = {
 658        .get_link               = ethtool_op_get_link,
 659        .get_settings           = macvlan_ethtool_get_settings,
 660        .get_drvinfo            = macvlan_ethtool_get_drvinfo,
 661};
 662
 663static const struct net_device_ops macvlan_netdev_ops = {
 664        .ndo_init               = macvlan_init,
 665        .ndo_uninit             = macvlan_uninit,
 666        .ndo_open               = macvlan_open,
 667        .ndo_stop               = macvlan_stop,
 668        .ndo_start_xmit         = macvlan_start_xmit,
 669        .ndo_change_mtu         = macvlan_change_mtu,
 670        .ndo_fix_features       = macvlan_fix_features,
 671        .ndo_change_rx_flags    = macvlan_change_rx_flags,
 672        .ndo_set_mac_address    = macvlan_set_mac_address,
 673        .ndo_set_rx_mode        = macvlan_set_mac_lists,
 674        .ndo_get_stats64        = macvlan_dev_get_stats64,
 675        .ndo_validate_addr      = eth_validate_addr,
 676        .ndo_vlan_rx_add_vid    = macvlan_vlan_rx_add_vid,
 677        .ndo_vlan_rx_kill_vid   = macvlan_vlan_rx_kill_vid,
 678        .ndo_fdb_add            = macvlan_fdb_add,
 679        .ndo_fdb_del            = macvlan_fdb_del,
 680        .ndo_fdb_dump           = ndo_dflt_fdb_dump,
 681};
 682
 683void macvlan_common_setup(struct net_device *dev)
 684{
 685        ether_setup(dev);
 686
 687        dev->priv_flags        &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
 688        dev->priv_flags        |= IFF_UNICAST_FLT;
 689        dev->netdev_ops         = &macvlan_netdev_ops;
 690        dev->destructor         = free_netdev;
 691        dev->header_ops         = &macvlan_hard_header_ops;
 692        dev->ethtool_ops        = &macvlan_ethtool_ops;
 693}
 694EXPORT_SYMBOL_GPL(macvlan_common_setup);
 695
 696static void macvlan_setup(struct net_device *dev)
 697{
 698        macvlan_common_setup(dev);
 699        dev->tx_queue_len       = 0;
 700}
 701
 702static int macvlan_port_create(struct net_device *dev)
 703{
 704        struct macvlan_port *port;
 705        unsigned int i;
 706        int err;
 707
 708        if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
 709                return -EINVAL;
 710
 711        port = kzalloc(sizeof(*port), GFP_KERNEL);
 712        if (port == NULL)
 713                return -ENOMEM;
 714
 715        port->passthru = false;
 716        port->dev = dev;
 717        INIT_LIST_HEAD(&port->vlans);
 718        for (i = 0; i < MACVLAN_HASH_SIZE; i++)
 719                INIT_HLIST_HEAD(&port->vlan_hash[i]);
 720
 721        err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
 722        if (err)
 723                kfree(port);
 724        else
 725                dev->priv_flags |= IFF_MACVLAN_PORT;
 726        return err;
 727}
 728
 729static void macvlan_port_destroy(struct net_device *dev)
 730{
 731        struct macvlan_port *port = macvlan_port_get_rtnl(dev);
 732
 733        dev->priv_flags &= ~IFF_MACVLAN_PORT;
 734        netdev_rx_handler_unregister(dev);
 735        kfree_rcu(port, rcu);
 736}
 737
 738static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
 739{
 740        if (tb[IFLA_ADDRESS]) {
 741                if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
 742                        return -EINVAL;
 743                if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
 744                        return -EADDRNOTAVAIL;
 745        }
 746
 747        if (data && data[IFLA_MACVLAN_FLAGS] &&
 748            nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
 749                return -EINVAL;
 750
 751        if (data && data[IFLA_MACVLAN_MODE]) {
 752                switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
 753                case MACVLAN_MODE_PRIVATE:
 754                case MACVLAN_MODE_VEPA:
 755                case MACVLAN_MODE_BRIDGE:
 756                case MACVLAN_MODE_PASSTHRU:
 757                        break;
 758                default:
 759                        return -EINVAL;
 760                }
 761        }
 762        return 0;
 763}
 764
 765int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
 766                           struct nlattr *tb[], struct nlattr *data[],
 767                           int (*receive)(struct sk_buff *skb),
 768                           int (*forward)(struct net_device *dev,
 769                                          struct sk_buff *skb))
 770{
 771        struct macvlan_dev *vlan = netdev_priv(dev);
 772        struct macvlan_port *port;
 773        struct net_device *lowerdev;
 774        int err;
 775
 776        if (!tb[IFLA_LINK])
 777                return -EINVAL;
 778
 779        lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
 780        if (lowerdev == NULL)
 781                return -ENODEV;
 782
 783        /* When creating macvlans on top of other macvlans - use
 784         * the real device as the lowerdev.
 785         */
 786        if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) {
 787                struct macvlan_dev *lowervlan = netdev_priv(lowerdev);
 788                lowerdev = lowervlan->lowerdev;
 789        }
 790
 791        if (!tb[IFLA_MTU])
 792                dev->mtu = lowerdev->mtu;
 793        else if (dev->mtu > lowerdev->mtu)
 794                return -EINVAL;
 795
 796        if (!tb[IFLA_ADDRESS])
 797                eth_hw_addr_random(dev);
 798
 799        if (!macvlan_port_exists(lowerdev)) {
 800                err = macvlan_port_create(lowerdev);
 801                if (err < 0)
 802                        return err;
 803        }
 804        port = macvlan_port_get_rtnl(lowerdev);
 805
 806        /* Only 1 macvlan device can be created in passthru mode */
 807        if (port->passthru)
 808                return -EINVAL;
 809
 810        vlan->lowerdev = lowerdev;
 811        vlan->dev      = dev;
 812        vlan->port     = port;
 813        vlan->receive  = receive;
 814        vlan->forward  = forward;
 815        vlan->set_features = MACVLAN_FEATURES;
 816
 817        vlan->mode     = MACVLAN_MODE_VEPA;
 818        if (data && data[IFLA_MACVLAN_MODE])
 819                vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
 820
 821        if (data && data[IFLA_MACVLAN_FLAGS])
 822                vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
 823
 824        if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
 825                if (port->count)
 826                        return -EINVAL;
 827                port->passthru = true;
 828                eth_hw_addr_inherit(dev, lowerdev);
 829        }
 830
 831        err = netdev_upper_dev_link(lowerdev, dev);
 832        if (err)
 833                goto destroy_port;
 834
 835        port->count += 1;
 836        err = register_netdevice(dev);
 837        if (err < 0)
 838                goto upper_dev_unlink;
 839
 840        list_add_tail_rcu(&vlan->list, &port->vlans);
 841        netif_stacked_transfer_operstate(lowerdev, dev);
 842
 843        return 0;
 844
 845upper_dev_unlink:
 846        netdev_upper_dev_unlink(lowerdev, dev);
 847destroy_port:
 848        port->count -= 1;
 849        if (!port->count)
 850                macvlan_port_destroy(lowerdev);
 851
 852        return err;
 853}
 854EXPORT_SYMBOL_GPL(macvlan_common_newlink);
 855
 856static int macvlan_newlink(struct net *src_net, struct net_device *dev,
 857                           struct nlattr *tb[], struct nlattr *data[])
 858{
 859        return macvlan_common_newlink(src_net, dev, tb, data,
 860                                      netif_rx,
 861                                      dev_forward_skb);
 862}
 863
 864void macvlan_dellink(struct net_device *dev, struct list_head *head)
 865{
 866        struct macvlan_dev *vlan = netdev_priv(dev);
 867
 868        list_del_rcu(&vlan->list);
 869        unregister_netdevice_queue(dev, head);
 870        netdev_upper_dev_unlink(vlan->lowerdev, dev);
 871}
 872EXPORT_SYMBOL_GPL(macvlan_dellink);
 873
 874static int macvlan_changelink(struct net_device *dev,
 875                struct nlattr *tb[], struct nlattr *data[])
 876{
 877        struct macvlan_dev *vlan = netdev_priv(dev);
 878        enum macvlan_mode mode;
 879        bool set_mode = false;
 880
 881        /* Validate mode, but don't set yet: setting flags may fail. */
 882        if (data && data[IFLA_MACVLAN_MODE]) {
 883                set_mode = true;
 884                mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
 885                /* Passthrough mode can't be set or cleared dynamically */
 886                if ((mode == MACVLAN_MODE_PASSTHRU) !=
 887                    (vlan->mode == MACVLAN_MODE_PASSTHRU))
 888                        return -EINVAL;
 889        }
 890
 891        if (data && data[IFLA_MACVLAN_FLAGS]) {
 892                __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
 893                bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
 894                if (vlan->port->passthru && promisc) {
 895                        int err;
 896
 897                        if (flags & MACVLAN_FLAG_NOPROMISC)
 898                                err = dev_set_promiscuity(vlan->lowerdev, -1);
 899                        else
 900                                err = dev_set_promiscuity(vlan->lowerdev, 1);
 901                        if (err < 0)
 902                                return err;
 903                }
 904                vlan->flags = flags;
 905        }
 906        if (set_mode)
 907                vlan->mode = mode;
 908        return 0;
 909}
 910
 911static size_t macvlan_get_size(const struct net_device *dev)
 912{
 913        return (0
 914                + nla_total_size(4) /* IFLA_MACVLAN_MODE */
 915                + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
 916                );
 917}
 918
 919static int macvlan_fill_info(struct sk_buff *skb,
 920                                const struct net_device *dev)
 921{
 922        struct macvlan_dev *vlan = netdev_priv(dev);
 923
 924        if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
 925                goto nla_put_failure;
 926        if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
 927                goto nla_put_failure;
 928        return 0;
 929
 930nla_put_failure:
 931        return -EMSGSIZE;
 932}
 933
 934static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
 935        [IFLA_MACVLAN_MODE]  = { .type = NLA_U32 },
 936        [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
 937};
 938
 939int macvlan_link_register(struct rtnl_link_ops *ops)
 940{
 941        /* common fields */
 942        ops->priv_size          = sizeof(struct macvlan_dev);
 943        ops->validate           = macvlan_validate;
 944        ops->maxtype            = IFLA_MACVLAN_MAX;
 945        ops->policy             = macvlan_policy;
 946        ops->changelink         = macvlan_changelink;
 947        ops->get_size           = macvlan_get_size;
 948        ops->fill_info          = macvlan_fill_info;
 949
 950        return rtnl_link_register(ops);
 951};
 952EXPORT_SYMBOL_GPL(macvlan_link_register);
 953
 954static struct rtnl_link_ops macvlan_link_ops = {
 955        .kind           = "macvlan",
 956        .setup          = macvlan_setup,
 957        .newlink        = macvlan_newlink,
 958        .dellink        = macvlan_dellink,
 959};
 960
 961static int macvlan_device_event(struct notifier_block *unused,
 962                                unsigned long event, void *ptr)
 963{
 964        struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 965        struct macvlan_dev *vlan, *next;
 966        struct macvlan_port *port;
 967        LIST_HEAD(list_kill);
 968
 969        if (!macvlan_port_exists(dev))
 970                return NOTIFY_DONE;
 971
 972        port = macvlan_port_get_rtnl(dev);
 973
 974        switch (event) {
 975        case NETDEV_CHANGE:
 976                list_for_each_entry(vlan, &port->vlans, list)
 977                        netif_stacked_transfer_operstate(vlan->lowerdev,
 978                                                         vlan->dev);
 979                break;
 980        case NETDEV_FEAT_CHANGE:
 981                list_for_each_entry(vlan, &port->vlans, list) {
 982                        vlan->dev->features = dev->features & MACVLAN_FEATURES;
 983                        vlan->dev->gso_max_size = dev->gso_max_size;
 984                        netdev_features_change(vlan->dev);
 985                }
 986                break;
 987        case NETDEV_UNREGISTER:
 988                /* twiddle thumbs on netns device moves */
 989                if (dev->reg_state != NETREG_UNREGISTERING)
 990                        break;
 991
 992                list_for_each_entry_safe(vlan, next, &port->vlans, list)
 993                        vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
 994                unregister_netdevice_many(&list_kill);
 995                list_del(&list_kill);
 996                break;
 997        case NETDEV_PRE_TYPE_CHANGE:
 998                /* Forbid underlaying device to change its type. */
 999                return NOTIFY_BAD;
1000        }
1001        return NOTIFY_DONE;
1002}
1003
1004static struct notifier_block macvlan_notifier_block __read_mostly = {
1005        .notifier_call  = macvlan_device_event,
1006};
1007
1008static int __init macvlan_init_module(void)
1009{
1010        int err;
1011
1012        register_netdevice_notifier(&macvlan_notifier_block);
1013
1014        err = macvlan_link_register(&macvlan_link_ops);
1015        if (err < 0)
1016                goto err1;
1017        return 0;
1018err1:
1019        unregister_netdevice_notifier(&macvlan_notifier_block);
1020        return err;
1021}
1022
1023static void __exit macvlan_cleanup_module(void)
1024{
1025        rtnl_link_unregister(&macvlan_link_ops);
1026        unregister_netdevice_notifier(&macvlan_notifier_block);
1027}
1028
1029module_init(macvlan_init_module);
1030module_exit(macvlan_cleanup_module);
1031
1032MODULE_LICENSE("GPL");
1033MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1034MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1035MODULE_ALIAS_RTNL_LINK("macvlan");
1036
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