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