kernel/drivers/net/ipvlan/ipvlan_main.c

   1 /* Copyright (c) 2014 Mahesh Bandewar <maheshb@google.com>
   2  *
   3  * This program is free software; you can redistribute it and/or
   4  * modify it under the terms of the GNU General Public License as
   5  * published by the Free Software Foundation; either version 2 of
   6  * the License, or (at your option) any later version.
   7  *
   8  */
   9
  10 #include "ipvlan.h"
  11
  12 void ipvlan_adjust_mtu(struct ipvl_dev *ipvlan, struct net_device *dev)
  13 {
  14         ipvlan->dev->mtu = dev->mtu - ipvlan->mtu_adj;
  15 }
  16
  17 void ipvlan_set_port_mode(struct ipvl_port *port, u32 nval)
  18 {
  19         struct ipvl_dev *ipvlan;
  20
  21         if (port->mode != nval) {
  22                 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
  23                         if (nval == IPVLAN_MODE_L3)
  24                                 ipvlan->dev->flags |= IFF_NOARP;
  25                         else
  26                                 ipvlan->dev->flags &= ~IFF_NOARP;
  27                 }
  28                 port->mode = nval;
  29         }
  30 }
  31
  32 static int ipvlan_port_create(struct net_device *dev)
  33 {
  34         struct ipvl_port *port;
  35         int err, idx;
  36
  37         if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) {
  38                 netdev_err(dev, "Master is either lo or non-ether device\n");
  39                 return -EINVAL;
  40         }
  41
  42         if (netif_is_macvlan_port(dev)) {
  43                 netdev_err(dev, "Master is a macvlan port.\n");
  44                 return -EBUSY;
  45         }
  46
  47         port = kzalloc(sizeof(struct ipvl_port), GFP_KERNEL);
  48         if (!port)
  49                 return -ENOMEM;
  50
  51         port->dev = dev;
  52         port->mode = IPVLAN_MODE_L3;
  53         INIT_LIST_HEAD(&port->ipvlans);
  54         for (idx = 0; idx < IPVLAN_HASH_SIZE; idx++)
  55                 INIT_HLIST_HEAD(&port->hlhead[idx]);
  56
  57         skb_queue_head_init(&port->backlog);
  58         INIT_WORK(&port->wq, ipvlan_process_multicast);
  59
  60         err = netdev_rx_handler_register(dev, ipvlan_handle_frame, port);
  61         if (err)
  62                 goto err;
  63
  64         dev->priv_flags |= IFF_IPVLAN_MASTER;
  65         return 0;
  66
  67 err:
  68         kfree_rcu(port, rcu);
  69         return err;
  70 }
  71
  72 static void ipvlan_port_destroy(struct net_device *dev)
  73 {
  74         struct ipvl_port *port = ipvlan_port_get_rtnl(dev);
  75
  76         dev->priv_flags &= ~IFF_IPVLAN_MASTER;
  77         netdev_rx_handler_unregister(dev);
  78         cancel_work_sync(&port->wq);
  79         __skb_queue_purge(&port->backlog);
  80         kfree_rcu(port, rcu);
  81 }
  82
  83 /* ipvlan network devices have devices nesting below it and are a special
  84  * "super class" of normal network devices; split their locks off into a
  85  * separate class since they always nest.
  86  */
  87 static struct lock_class_key ipvlan_netdev_xmit_lock_key;
  88 static struct lock_class_key ipvlan_netdev_addr_lock_key;
  89
  90 #define IPVLAN_FEATURES \
  91         (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
  92          NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
  93          NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
  94          NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
  95
  96 #define IPVLAN_STATE_MASK \
  97         ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
  98
  99 static void ipvlan_set_lockdep_class_one(struct net_device *dev,
 100                                          struct netdev_queue *txq,
 101                                          void *_unused)
 102 {
 103         lockdep_set_class(&txq->_xmit_lock, &ipvlan_netdev_xmit_lock_key);
 104 }
 105
 106 static void ipvlan_set_lockdep_class(struct net_device *dev)
 107 {
 108         lockdep_set_class(&dev->addr_list_lock, &ipvlan_netdev_addr_lock_key);
 109         netdev_for_each_tx_queue(dev, ipvlan_set_lockdep_class_one, NULL);
 110 }
 111
 112 static int ipvlan_init(struct net_device *dev)
 113 {
 114         struct ipvl_dev *ipvlan = netdev_priv(dev);
 115         const struct net_device *phy_dev = ipvlan->phy_dev;
 116
 117         dev->state = (dev->state & ~IPVLAN_STATE_MASK) |
 118                      (phy_dev->state & IPVLAN_STATE_MASK);
 119         dev->features = phy_dev->features & IPVLAN_FEATURES;
 120         dev->features |= NETIF_F_LLTX;
 121         dev->gso_max_size = phy_dev->gso_max_size;
 122         dev->hard_header_len = phy_dev->hard_header_len;
 123
 124         ipvlan_set_lockdep_class(dev);
 125
 126         ipvlan->pcpu_stats = alloc_percpu(struct ipvl_pcpu_stats);
 127         if (!ipvlan->pcpu_stats)
 128                 return -ENOMEM;
 129
 130         return 0;
 131 }
 132
 133 static void ipvlan_uninit(struct net_device *dev)
 134 {
 135         struct ipvl_dev *ipvlan = netdev_priv(dev);
 136         struct ipvl_port *port = ipvlan->port;
 137
 138         free_percpu(ipvlan->pcpu_stats);
 139
 140         port->count -= 1;
 141         if (!port->count)
 142                 ipvlan_port_destroy(port->dev);
 143 }
 144
 145 static int ipvlan_open(struct net_device *dev)
 146 {
 147         struct ipvl_dev *ipvlan = netdev_priv(dev);
 148         struct net_device *phy_dev = ipvlan->phy_dev;
 149         struct ipvl_addr *addr;
 150
 151         if (ipvlan->port->mode == IPVLAN_MODE_L3)
 152                 dev->flags |= IFF_NOARP;
 153         else
 154                 dev->flags &= ~IFF_NOARP;
 155
 156         list_for_each_entry(addr, &ipvlan->addrs, anode)
 157                 ipvlan_ht_addr_add(ipvlan, addr);
 158
 159         return dev_uc_add(phy_dev, phy_dev->dev_addr);
 160 }
 161
 162 static int ipvlan_stop(struct net_device *dev)
 163 {
 164         struct ipvl_dev *ipvlan = netdev_priv(dev);
 165         struct net_device *phy_dev = ipvlan->phy_dev;
 166         struct ipvl_addr *addr;
 167
 168         dev_uc_unsync(phy_dev, dev);
 169         dev_mc_unsync(phy_dev, dev);
 170
 171         dev_uc_del(phy_dev, phy_dev->dev_addr);
 172
 173         list_for_each_entry(addr, &ipvlan->addrs, anode)
 174                 ipvlan_ht_addr_del(addr);
 175
 176         return 0;
 177 }
 178
 179 static netdev_tx_t ipvlan_start_xmit(struct sk_buff *skb,
 180                                      struct net_device *dev)
 181 {
 182         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 183         int skblen = skb->len;
 184         int ret;
 185
 186         ret = ipvlan_queue_xmit(skb, dev);
 187         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 188                 struct ipvl_pcpu_stats *pcptr;
 189
 190                 pcptr = this_cpu_ptr(ipvlan->pcpu_stats);
 191
 192                 u64_stats_update_begin(&pcptr->syncp);
 193                 pcptr->tx_pkts++;
 194                 pcptr->tx_bytes += skblen;
 195                 u64_stats_update_end(&pcptr->syncp);
 196         } else {
 197                 this_cpu_inc(ipvlan->pcpu_stats->tx_drps);
 198         }
 199         return ret;
 200 }
 201
 202 static netdev_features_t ipvlan_fix_features(struct net_device *dev,
 203                                              netdev_features_t features)
 204 {
 205         struct ipvl_dev *ipvlan = netdev_priv(dev);
 206
 207         return features & (ipvlan->sfeatures | ~IPVLAN_FEATURES);
 208 }
 209
 210 static void ipvlan_change_rx_flags(struct net_device *dev, int change)
 211 {
 212         struct ipvl_dev *ipvlan = netdev_priv(dev);
 213         struct net_device *phy_dev = ipvlan->phy_dev;
 214
 215         if (change & IFF_ALLMULTI)
 216                 dev_set_allmulti(phy_dev, dev->flags & IFF_ALLMULTI? 1 : -1);
 217 }
 218
 219 static void ipvlan_set_multicast_mac_filter(struct net_device *dev)
 220 {
 221         struct ipvl_dev *ipvlan = netdev_priv(dev);
 222
 223         if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
 224                 bitmap_fill(ipvlan->mac_filters, IPVLAN_MAC_FILTER_SIZE);
 225         } else {
 226                 struct netdev_hw_addr *ha;
 227                 DECLARE_BITMAP(mc_filters, IPVLAN_MAC_FILTER_SIZE);
 228
 229                 bitmap_zero(mc_filters, IPVLAN_MAC_FILTER_SIZE);
 230                 netdev_for_each_mc_addr(ha, dev)
 231                         __set_bit(ipvlan_mac_hash(ha->addr), mc_filters);
 232
 233                 /* Turn-on broadcast bit irrespective of address family,
 234                  * since broadcast is deferred to a work-queue, hence no
 235                  * impact on fast-path processing.
 236                  */
 237                 __set_bit(ipvlan_mac_hash(dev->broadcast), mc_filters);
 238
 239                 bitmap_copy(ipvlan->mac_filters, mc_filters,
 240                             IPVLAN_MAC_FILTER_SIZE);
 241         }
 242         dev_uc_sync(ipvlan->phy_dev, dev);
 243         dev_mc_sync(ipvlan->phy_dev, dev);
 244 }
 245
 246 static struct rtnl_link_stats64 *ipvlan_get_stats64(struct net_device *dev,
 247                                                     struct rtnl_link_stats64 *s)
 248 {
 249         struct ipvl_dev *ipvlan = netdev_priv(dev);
 250
 251         if (ipvlan->pcpu_stats) {
 252                 struct ipvl_pcpu_stats *pcptr;
 253                 u64 rx_pkts, rx_bytes, rx_mcast, tx_pkts, tx_bytes;
 254                 u32 rx_errs = 0, tx_drps = 0;
 255                 u32 strt;
 256                 int idx;
 257
 258                 for_each_possible_cpu(idx) {
 259                         pcptr = per_cpu_ptr(ipvlan->pcpu_stats, idx);
 260                         do {
 261                                 strt= u64_stats_fetch_begin_irq(&pcptr->syncp);
 262                                 rx_pkts = pcptr->rx_pkts;
 263                                 rx_bytes = pcptr->rx_bytes;
 264                                 rx_mcast = pcptr->rx_mcast;
 265                                 tx_pkts = pcptr->tx_pkts;
 266                                 tx_bytes = pcptr->tx_bytes;
 267                         } while (u64_stats_fetch_retry_irq(&pcptr->syncp,
 268                                                            strt));
 269
 270                         s->rx_packets += rx_pkts;
 271                         s->rx_bytes += rx_bytes;
 272                         s->multicast += rx_mcast;
 273                         s->tx_packets += tx_pkts;
 274                         s->tx_bytes += tx_bytes;
 275
 276                         /* u32 values are updated without syncp protection. */
 277                         rx_errs += pcptr->rx_errs;
 278                         tx_drps += pcptr->tx_drps;
 279                 }
 280                 s->rx_errors = rx_errs;
 281                 s->rx_dropped = rx_errs;
 282                 s->tx_dropped = tx_drps;
 283         }
 284         return s;
 285 }
 286
 287 static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid)
 288 {
 289         struct ipvl_dev *ipvlan = netdev_priv(dev);
 290         struct net_device *phy_dev = ipvlan->phy_dev;
 291
 292         return vlan_vid_add(phy_dev, proto, vid);
 293 }
 294
 295 static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
 296                                    u16 vid)
 297 {
 298         struct ipvl_dev *ipvlan = netdev_priv(dev);
 299         struct net_device *phy_dev = ipvlan->phy_dev;
 300
 301         vlan_vid_del(phy_dev, proto, vid);
 302         return 0;
 303 }
 304
 305 static int ipvlan_get_iflink(const struct net_device *dev)
 306 {
 307         struct ipvl_dev *ipvlan = netdev_priv(dev);
 308
 309         return ipvlan->phy_dev->ifindex;
 310 }
 311
 312 static const struct net_device_ops ipvlan_netdev_ops = {
 313         .ndo_init               = ipvlan_init,
 314         .ndo_uninit             = ipvlan_uninit,
 315         .ndo_open               = ipvlan_open,
 316         .ndo_stop               = ipvlan_stop,
 317         .ndo_start_xmit         = ipvlan_start_xmit,
 318         .ndo_fix_features       = ipvlan_fix_features,
 319         .ndo_change_rx_flags    = ipvlan_change_rx_flags,
 320         .ndo_set_rx_mode        = ipvlan_set_multicast_mac_filter,
 321         .ndo_get_stats64        = ipvlan_get_stats64,
 322         .ndo_vlan_rx_add_vid    = ipvlan_vlan_rx_add_vid,
 323         .ndo_vlan_rx_kill_vid   = ipvlan_vlan_rx_kill_vid,
 324         .ndo_get_iflink         = ipvlan_get_iflink,
 325 };
 326
 327 static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
 328                               unsigned short type, const void *daddr,
 329                               const void *saddr, unsigned len)
 330 {
 331         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 332         struct net_device *phy_dev = ipvlan->phy_dev;
 333
 334         /* TODO Probably use a different field than dev_addr so that the
 335          * mac-address on the virtual device is portable and can be carried
 336          * while the packets use the mac-addr on the physical device.
 337          */
 338         return dev_hard_header(skb, phy_dev, type, daddr,
 339                                saddr ? : dev->dev_addr, len);
 340 }
 341
 342 static const struct header_ops ipvlan_header_ops = {
 343         .create         = ipvlan_hard_header,
 344         .parse          = eth_header_parse,
 345         .cache          = eth_header_cache,
 346         .cache_update   = eth_header_cache_update,
 347 };
 348
 349 static int ipvlan_ethtool_get_settings(struct net_device *dev,
 350                                        struct ethtool_cmd *cmd)
 351 {
 352         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 353
 354         return __ethtool_get_settings(ipvlan->phy_dev, cmd);
 355 }
 356
 357 static void ipvlan_ethtool_get_drvinfo(struct net_device *dev,
 358                                        struct ethtool_drvinfo *drvinfo)
 359 {
 360         strlcpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver));
 361         strlcpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version));
 362 }
 363
 364 static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev)
 365 {
 366         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 367
 368         return ipvlan->msg_enable;
 369 }
 370
 371 static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value)
 372 {
 373         struct ipvl_dev *ipvlan = netdev_priv(dev);
 374
 375         ipvlan->msg_enable = value;
 376 }
 377
 378 static const struct ethtool_ops ipvlan_ethtool_ops = {
 379         .get_link       = ethtool_op_get_link,
 380         .get_settings   = ipvlan_ethtool_get_settings,
 381         .get_drvinfo    = ipvlan_ethtool_get_drvinfo,
 382         .get_msglevel   = ipvlan_ethtool_get_msglevel,
 383         .set_msglevel   = ipvlan_ethtool_set_msglevel,
 384 };
 385
 386 static int ipvlan_nl_changelink(struct net_device *dev,
 387                                 struct nlattr *tb[], struct nlattr *data[])
 388 {
 389         struct ipvl_dev *ipvlan = netdev_priv(dev);
 390         struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
 391
 392         if (data && data[IFLA_IPVLAN_MODE]) {
 393                 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
 394
 395                 ipvlan_set_port_mode(port, nmode);
 396         }
 397         return 0;
 398 }
 399
 400 static size_t ipvlan_nl_getsize(const struct net_device *dev)
 401 {
 402         return (0
 403                 + nla_total_size(2) /* IFLA_IPVLAN_MODE */
 404                 );
 405 }
 406
 407 static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[])
 408 {
 409         if (data && data[IFLA_IPVLAN_MODE]) {
 410                 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
 411
 412                 if (mode < IPVLAN_MODE_L2 || mode >= IPVLAN_MODE_MAX)
 413                         return -EINVAL;
 414         }
 415         return 0;
 416 }
 417
 418 static int ipvlan_nl_fillinfo(struct sk_buff *skb,
 419                               const struct net_device *dev)
 420 {
 421         struct ipvl_dev *ipvlan = netdev_priv(dev);
 422         struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
 423         int ret = -EINVAL;
 424
 425         if (!port)
 426                 goto err;
 427
 428         ret = -EMSGSIZE;
 429         if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode))
 430                 goto err;
 431
 432         return 0;
 433
 434 err:
 435         return ret;
 436 }
 437
 438 static int ipvlan_link_new(struct net *src_net, struct net_device *dev,
 439                            struct nlattr *tb[], struct nlattr *data[])
 440 {
 441         struct ipvl_dev *ipvlan = netdev_priv(dev);
 442         struct ipvl_port *port;
 443         struct net_device *phy_dev;
 444         int err;
 445
 446         if (!tb[IFLA_LINK])
 447                 return -EINVAL;
 448
 449         phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
 450         if (!phy_dev)
 451                 return -ENODEV;
 452
 453         if (netif_is_ipvlan(phy_dev)) {
 454                 struct ipvl_dev *tmp = netdev_priv(phy_dev);
 455
 456                 phy_dev = tmp->phy_dev;
 457         } else if (!netif_is_ipvlan_port(phy_dev)) {
 458                 err = ipvlan_port_create(phy_dev);
 459                 if (err < 0)
 460                         return err;
 461         }
 462
 463         port = ipvlan_port_get_rtnl(phy_dev);
 464         if (data && data[IFLA_IPVLAN_MODE])
 465                 port->mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
 466
 467         ipvlan->phy_dev = phy_dev;
 468         ipvlan->dev = dev;
 469         ipvlan->port = port;
 470         ipvlan->sfeatures = IPVLAN_FEATURES;
 471         INIT_LIST_HEAD(&ipvlan->addrs);
 472
 473         /* TODO Probably put random address here to be presented to the
 474          * world but keep using the physical-dev address for the outgoing
 475          * packets.
 476          */
 477         memcpy(dev->dev_addr, phy_dev->dev_addr, ETH_ALEN);
 478
 479         dev->priv_flags |= IFF_IPVLAN_SLAVE;
 480
 481         port->count += 1;
 482         err = register_netdevice(dev);
 483         if (err < 0)
 484                 goto ipvlan_destroy_port;
 485
 486         err = netdev_upper_dev_link(phy_dev, dev);
 487         if (err)
 488                 goto ipvlan_destroy_port;
 489
 490         list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans);
 491         netif_stacked_transfer_operstate(phy_dev, dev);
 492         return 0;
 493
 494 ipvlan_destroy_port:
 495         port->count -= 1;
 496         if (!port->count)
 497                 ipvlan_port_destroy(phy_dev);
 498
 499         return err;
 500 }
 501
 502 static void ipvlan_link_delete(struct net_device *dev, struct list_head *head)
 503 {
 504         struct ipvl_dev *ipvlan = netdev_priv(dev);
 505         struct ipvl_addr *addr, *next;
 506
 507         list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) {
 508                 ipvlan_ht_addr_del(addr);
 509                 list_del(&addr->anode);
 510                 kfree_rcu(addr, rcu);
 511         }
 512
 513         list_del_rcu(&ipvlan->pnode);
 514         unregister_netdevice_queue(dev, head);
 515         netdev_upper_dev_unlink(ipvlan->phy_dev, dev);
 516 }
 517
 518 static void ipvlan_link_setup(struct net_device *dev)
 519 {
 520         ether_setup(dev);
 521
 522         dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
 523         dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE;
 524         dev->netdev_ops = &ipvlan_netdev_ops;
 525         dev->destructor = free_netdev;
 526         dev->header_ops = &ipvlan_header_ops;
 527         dev->ethtool_ops = &ipvlan_ethtool_ops;
 528 }
 529
 530 static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] =
 531 {
 532         [IFLA_IPVLAN_MODE] = { .type = NLA_U16 },
 533 };
 534
 535 static struct rtnl_link_ops ipvlan_link_ops = {
 536         .kind           = "ipvlan",
 537         .priv_size      = sizeof(struct ipvl_dev),
 538
 539         .get_size       = ipvlan_nl_getsize,
 540         .policy         = ipvlan_nl_policy,
 541         .validate       = ipvlan_nl_validate,
 542         .fill_info      = ipvlan_nl_fillinfo,
 543         .changelink     = ipvlan_nl_changelink,
 544         .maxtype        = IFLA_IPVLAN_MAX,
 545
 546         .setup          = ipvlan_link_setup,
 547         .newlink        = ipvlan_link_new,
 548         .dellink        = ipvlan_link_delete,
 549 };
 550
 551 static int ipvlan_link_register(struct rtnl_link_ops *ops)
 552 {
 553         return rtnl_link_register(ops);
 554 }
 555
 556 static int ipvlan_device_event(struct notifier_block *unused,
 557                                unsigned long event, void *ptr)
 558 {
 559         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 560         struct ipvl_dev *ipvlan, *next;
 561         struct ipvl_port *port;
 562         LIST_HEAD(lst_kill);
 563
 564         if (!netif_is_ipvlan_port(dev))
 565                 return NOTIFY_DONE;
 566
 567         port = ipvlan_port_get_rtnl(dev);
 568
 569         switch (event) {
 570         case NETDEV_CHANGE:
 571                 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
 572                         netif_stacked_transfer_operstate(ipvlan->phy_dev,
 573                                                          ipvlan->dev);
 574                 break;
 575
 576         case NETDEV_UNREGISTER:
 577                 if (dev->reg_state != NETREG_UNREGISTERING)
 578                         break;
 579
 580                 list_for_each_entry_safe(ipvlan, next, &port->ipvlans,
 581                                          pnode)
 582                         ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev,
 583                                                             &lst_kill);
 584                 unregister_netdevice_many(&lst_kill);
 585                 break;
 586
 587         case NETDEV_FEAT_CHANGE:
 588                 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
 589                         ipvlan->dev->features = dev->features & IPVLAN_FEATURES;
 590                         ipvlan->dev->gso_max_size = dev->gso_max_size;
 591                         netdev_features_change(ipvlan->dev);
 592                 }
 593                 break;
 594
 595         case NETDEV_CHANGEMTU:
 596                 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
 597                         ipvlan_adjust_mtu(ipvlan, dev);
 598                 break;
 599
 600         case NETDEV_PRE_TYPE_CHANGE:
 601                 /* Forbid underlying device to change its type. */
 602                 return NOTIFY_BAD;
 603         }
 604         return NOTIFY_DONE;
 605 }
 606
 607 static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
 608 {
 609         struct ipvl_addr *addr;
 610
 611         if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true)) {
 612                 netif_err(ipvlan, ifup, ipvlan->dev,
 613                           "Failed to add IPv6=%pI6c addr for %s intf\n",
 614                           ip6_addr, ipvlan->dev->name);
 615                 return -EINVAL;
 616         }
 617         addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC);
 618         if (!addr)
 619                 return -ENOMEM;
 620
 621         addr->master = ipvlan;
 622         memcpy(&addr->ip6addr, ip6_addr, sizeof(struct in6_addr));
 623         addr->atype = IPVL_IPV6;
 624         list_add_tail(&addr->anode, &ipvlan->addrs);
 625
 626         /* If the interface is not up, the address will be added to the hash
 627          * list by ipvlan_open.
 628          */
 629         if (netif_running(ipvlan->dev))
 630                 ipvlan_ht_addr_add(ipvlan, addr);
 631
 632         return 0;
 633 }
 634
 635 static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
 636 {
 637         struct ipvl_addr *addr;
 638
 639         addr = ipvlan_find_addr(ipvlan, ip6_addr, true);
 640         if (!addr)
 641                 return;
 642
 643         ipvlan_ht_addr_del(addr);
 644         list_del(&addr->anode);
 645         kfree_rcu(addr, rcu);
 646
 647         return;
 648 }
 649
 650 static int ipvlan_addr6_event(struct notifier_block *unused,
 651                               unsigned long event, void *ptr)
 652 {
 653         struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr;
 654         struct net_device *dev = (struct net_device *)if6->idev->dev;
 655         struct ipvl_dev *ipvlan = netdev_priv(dev);
 656
 657         /* FIXME IPv6 autoconf calls us from bh without RTNL */
 658         if (in_softirq())
 659                 return NOTIFY_DONE;
 660
 661         if (!netif_is_ipvlan(dev))
 662                 return NOTIFY_DONE;
 663
 664         if (!ipvlan || !ipvlan->port)
 665                 return NOTIFY_DONE;
 666
 667         switch (event) {
 668         case NETDEV_UP:
 669                 if (ipvlan_add_addr6(ipvlan, &if6->addr))
 670                         return NOTIFY_BAD;
 671                 break;
 672
 673         case NETDEV_DOWN:
 674                 ipvlan_del_addr6(ipvlan, &if6->addr);
 675                 break;
 676         }
 677
 678         return NOTIFY_OK;
 679 }
 680
 681 static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
 682 {
 683         struct ipvl_addr *addr;
 684
 685         if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false)) {
 686                 netif_err(ipvlan, ifup, ipvlan->dev,
 687                           "Failed to add IPv4=%pI4 on %s intf.\n",
 688                           ip4_addr, ipvlan->dev->name);
 689                 return -EINVAL;
 690         }
 691         addr = kzalloc(sizeof(struct ipvl_addr), GFP_KERNEL);
 692         if (!addr)
 693                 return -ENOMEM;
 694
 695         addr->master = ipvlan;
 696         memcpy(&addr->ip4addr, ip4_addr, sizeof(struct in_addr));
 697         addr->atype = IPVL_IPV4;
 698         list_add_tail(&addr->anode, &ipvlan->addrs);
 699
 700         /* If the interface is not up, the address will be added to the hash
 701          * list by ipvlan_open.
 702          */
 703         if (netif_running(ipvlan->dev))
 704                 ipvlan_ht_addr_add(ipvlan, addr);
 705
 706         return 0;
 707 }
 708
 709 static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
 710 {
 711         struct ipvl_addr *addr;
 712
 713         addr = ipvlan_find_addr(ipvlan, ip4_addr, false);
 714         if (!addr)
 715                 return;
 716
 717         ipvlan_ht_addr_del(addr);
 718         list_del(&addr->anode);
 719         kfree_rcu(addr, rcu);
 720
 721         return;
 722 }
 723
 724 static int ipvlan_addr4_event(struct notifier_block *unused,
 725                               unsigned long event, void *ptr)
 726 {
 727         struct in_ifaddr *if4 = (struct in_ifaddr *)ptr;
 728         struct net_device *dev = (struct net_device *)if4->ifa_dev->dev;
 729         struct ipvl_dev *ipvlan = netdev_priv(dev);
 730         struct in_addr ip4_addr;
 731
 732         if (!netif_is_ipvlan(dev))
 733                 return NOTIFY_DONE;
 734
 735         if (!ipvlan || !ipvlan->port)
 736                 return NOTIFY_DONE;
 737
 738         switch (event) {
 739         case NETDEV_UP:
 740                 ip4_addr.s_addr = if4->ifa_address;
 741                 if (ipvlan_add_addr4(ipvlan, &ip4_addr))
 742                         return NOTIFY_BAD;
 743                 break;
 744
 745         case NETDEV_DOWN:
 746                 ip4_addr.s_addr = if4->ifa_address;
 747                 ipvlan_del_addr4(ipvlan, &ip4_addr);
 748                 break;
 749         }
 750
 751         return NOTIFY_OK;
 752 }
 753
 754 static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = {
 755         .notifier_call = ipvlan_addr4_event,
 756 };
 757
 758 static struct notifier_block ipvlan_notifier_block __read_mostly = {
 759         .notifier_call = ipvlan_device_event,
 760 };
 761
 762 static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = {
 763         .notifier_call = ipvlan_addr6_event,
 764 };
 765
 766 static int __init ipvlan_init_module(void)
 767 {
 768         int err;
 769
 770         ipvlan_init_secret();
 771         register_netdevice_notifier(&ipvlan_notifier_block);
 772         register_inet6addr_notifier(&ipvlan_addr6_notifier_block);
 773         register_inetaddr_notifier(&ipvlan_addr4_notifier_block);
 774
 775         err = ipvlan_link_register(&ipvlan_link_ops);
 776         if (err < 0)
 777                 goto error;
 778
 779         return 0;
 780 error:
 781         unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
 782         unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
 783         unregister_netdevice_notifier(&ipvlan_notifier_block);
 784         return err;
 785 }
 786
 787 static void __exit ipvlan_cleanup_module(void)
 788 {
 789         rtnl_link_unregister(&ipvlan_link_ops);
 790         unregister_netdevice_notifier(&ipvlan_notifier_block);
 791         unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
 792         unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
 793 }
 794
 795 module_init(ipvlan_init_module);
 796 module_exit(ipvlan_cleanup_module);
 797
 798 MODULE_LICENSE("GPL");
 799 MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>");
 800 MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs");
 801 MODULE_ALIAS_RTNL_LINK("ipvlan");