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