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 static int ipvlan_set_port_mode(struct ipvl_port *port, u16 nval,
  13                                 struct netlink_ext_ack *extack)
  14 {
  15         struct ipvl_dev *ipvlan;
  16         unsigned int flags;
  17         int err;
  18
  19         ASSERT_RTNL();
  20         if (port->mode != nval) {
  21                 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
  22                         flags = ipvlan->dev->flags;
  23                         if (nval == IPVLAN_MODE_L3 || nval == IPVLAN_MODE_L3S) {
  24                                 err = dev_change_flags(ipvlan->dev,
  25                                                        flags | IFF_NOARP,
  26                                                        extack);
  27                         } else {
  28                                 err = dev_change_flags(ipvlan->dev,
  29                                                        flags & ~IFF_NOARP,
  30                                                        extack);
  31                         }
  32                         if (unlikely(err))
  33                                 goto fail;
  34                 }
  35                 if (nval == IPVLAN_MODE_L3S) {
  36                         /* New mode is L3S */
  37                         err = ipvlan_l3s_register(port);
  38                         if (err)
  39                                 goto fail;
  40                 } else if (port->mode == IPVLAN_MODE_L3S) {
  41                         /* Old mode was L3S */
  42                         ipvlan_l3s_unregister(port);
  43                 }
  44                 port->mode = nval;
  45         }
  46         return 0;
  47
  48 fail:
  49         /* Undo the flags changes that have been done so far. */
  50         list_for_each_entry_continue_reverse(ipvlan, &port->ipvlans, pnode) {
  51                 flags = ipvlan->dev->flags;
  52                 if (port->mode == IPVLAN_MODE_L3 ||
  53                     port->mode == IPVLAN_MODE_L3S)
  54                         dev_change_flags(ipvlan->dev, flags | IFF_NOARP,
  55                                          NULL);
  56                 else
  57                         dev_change_flags(ipvlan->dev, flags & ~IFF_NOARP,
  58                                          NULL);
  59         }
  60
  61         return err;
  62 }
  63
  64 static int ipvlan_port_create(struct net_device *dev)
  65 {
  66         struct ipvl_port *port;
  67         int err, idx;
  68
  69         port = kzalloc(sizeof(struct ipvl_port), GFP_KERNEL);
  70         if (!port)
  71                 return -ENOMEM;
  72
  73         write_pnet(&port->pnet, dev_net(dev));
  74         port->dev = dev;
  75         port->mode = IPVLAN_MODE_L3;
  76         INIT_LIST_HEAD(&port->ipvlans);
  77         for (idx = 0; idx < IPVLAN_HASH_SIZE; idx++)
  78                 INIT_HLIST_HEAD(&port->hlhead[idx]);
  79
  80         skb_queue_head_init(&port->backlog);
  81         INIT_WORK(&port->wq, ipvlan_process_multicast);
  82         ida_init(&port->ida);
  83         port->dev_id_start = 1;
  84
  85         err = netdev_rx_handler_register(dev, ipvlan_handle_frame, port);
  86         if (err)
  87                 goto err;
  88
  89         return 0;
  90
  91 err:
  92         kfree(port);
  93         return err;
  94 }
  95
  96 static void ipvlan_port_destroy(struct net_device *dev)
  97 {
  98         struct ipvl_port *port = ipvlan_port_get_rtnl(dev);
  99         struct sk_buff *skb;
 100
 101         if (port->mode == IPVLAN_MODE_L3S)
 102                 ipvlan_l3s_unregister(port);
 103         netdev_rx_handler_unregister(dev);
 104         cancel_work_sync(&port->wq);
 105         while ((skb = __skb_dequeue(&port->backlog)) != NULL) {
 106                 if (skb->dev)
 107                         dev_put(skb->dev);
 108                 kfree_skb(skb);
 109         }
 110         ida_destroy(&port->ida);
 111         kfree(port);
 112 }
 113
 114 #define IPVLAN_FEATURES \
 115         (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
 116          NETIF_F_GSO | NETIF_F_TSO | NETIF_F_GSO_ROBUST | \
 117          NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
 118          NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
 119
 120 #define IPVLAN_STATE_MASK \
 121         ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
 122
 123 static int ipvlan_init(struct net_device *dev)
 124 {
 125         struct ipvl_dev *ipvlan = netdev_priv(dev);
 126         struct net_device *phy_dev = ipvlan->phy_dev;
 127         struct ipvl_port *port;
 128         int err;
 129
 130         dev->state = (dev->state & ~IPVLAN_STATE_MASK) |
 131                      (phy_dev->state & IPVLAN_STATE_MASK);
 132         dev->features = phy_dev->features & IPVLAN_FEATURES;
 133         dev->features |= NETIF_F_LLTX | NETIF_F_VLAN_CHALLENGED;
 134         dev->gso_max_size = phy_dev->gso_max_size;
 135         dev->gso_max_segs = phy_dev->gso_max_segs;
 136         dev->hard_header_len = phy_dev->hard_header_len;
 137
 138         netdev_lockdep_set_classes(dev);
 139
 140         ipvlan->pcpu_stats = netdev_alloc_pcpu_stats(struct ipvl_pcpu_stats);
 141         if (!ipvlan->pcpu_stats)
 142                 return -ENOMEM;
 143
 144         if (!netif_is_ipvlan_port(phy_dev)) {
 145                 err = ipvlan_port_create(phy_dev);
 146                 if (err < 0) {
 147                         free_percpu(ipvlan->pcpu_stats);
 148                         return err;
 149                 }
 150         }
 151         port = ipvlan_port_get_rtnl(phy_dev);
 152         port->count += 1;
 153         return 0;
 154 }
 155
 156 static void ipvlan_uninit(struct net_device *dev)
 157 {
 158         struct ipvl_dev *ipvlan = netdev_priv(dev);
 159         struct net_device *phy_dev = ipvlan->phy_dev;
 160         struct ipvl_port *port;
 161
 162         free_percpu(ipvlan->pcpu_stats);
 163
 164         port = ipvlan_port_get_rtnl(phy_dev);
 165         port->count -= 1;
 166         if (!port->count)
 167                 ipvlan_port_destroy(port->dev);
 168 }
 169
 170 static int ipvlan_open(struct net_device *dev)
 171 {
 172         struct ipvl_dev *ipvlan = netdev_priv(dev);
 173         struct net_device *phy_dev = ipvlan->phy_dev;
 174         struct ipvl_addr *addr;
 175
 176         if (ipvlan->port->mode == IPVLAN_MODE_L3 ||
 177             ipvlan->port->mode == IPVLAN_MODE_L3S)
 178                 dev->flags |= IFF_NOARP;
 179         else
 180                 dev->flags &= ~IFF_NOARP;
 181
 182         rcu_read_lock();
 183         list_for_each_entry_rcu(addr, &ipvlan->addrs, anode)
 184                 ipvlan_ht_addr_add(ipvlan, addr);
 185         rcu_read_unlock();
 186
 187         return dev_uc_add(phy_dev, phy_dev->dev_addr);
 188 }
 189
 190 static int ipvlan_stop(struct net_device *dev)
 191 {
 192         struct ipvl_dev *ipvlan = netdev_priv(dev);
 193         struct net_device *phy_dev = ipvlan->phy_dev;
 194         struct ipvl_addr *addr;
 195
 196         dev_uc_unsync(phy_dev, dev);
 197         dev_mc_unsync(phy_dev, dev);
 198
 199         dev_uc_del(phy_dev, phy_dev->dev_addr);
 200
 201         rcu_read_lock();
 202         list_for_each_entry_rcu(addr, &ipvlan->addrs, anode)
 203                 ipvlan_ht_addr_del(addr);
 204         rcu_read_unlock();
 205
 206         return 0;
 207 }
 208
 209 static netdev_tx_t ipvlan_start_xmit(struct sk_buff *skb,
 210                                      struct net_device *dev)
 211 {
 212         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 213         int skblen = skb->len;
 214         int ret;
 215
 216         ret = ipvlan_queue_xmit(skb, dev);
 217         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 218                 struct ipvl_pcpu_stats *pcptr;
 219
 220                 pcptr = this_cpu_ptr(ipvlan->pcpu_stats);
 221
 222                 u64_stats_update_begin(&pcptr->syncp);
 223                 pcptr->tx_pkts++;
 224                 pcptr->tx_bytes += skblen;
 225                 u64_stats_update_end(&pcptr->syncp);
 226         } else {
 227                 this_cpu_inc(ipvlan->pcpu_stats->tx_drps);
 228         }
 229         return ret;
 230 }
 231
 232 static netdev_features_t ipvlan_fix_features(struct net_device *dev,
 233                                              netdev_features_t features)
 234 {
 235         struct ipvl_dev *ipvlan = netdev_priv(dev);
 236
 237         return features & (ipvlan->sfeatures | ~IPVLAN_FEATURES);
 238 }
 239
 240 static void ipvlan_change_rx_flags(struct net_device *dev, int change)
 241 {
 242         struct ipvl_dev *ipvlan = netdev_priv(dev);
 243         struct net_device *phy_dev = ipvlan->phy_dev;
 244
 245         if (change & IFF_ALLMULTI)
 246                 dev_set_allmulti(phy_dev, dev->flags & IFF_ALLMULTI? 1 : -1);
 247 }
 248
 249 static void ipvlan_set_multicast_mac_filter(struct net_device *dev)
 250 {
 251         struct ipvl_dev *ipvlan = netdev_priv(dev);
 252
 253         if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
 254                 bitmap_fill(ipvlan->mac_filters, IPVLAN_MAC_FILTER_SIZE);
 255         } else {
 256                 struct netdev_hw_addr *ha;
 257                 DECLARE_BITMAP(mc_filters, IPVLAN_MAC_FILTER_SIZE);
 258
 259                 bitmap_zero(mc_filters, IPVLAN_MAC_FILTER_SIZE);
 260                 netdev_for_each_mc_addr(ha, dev)
 261                         __set_bit(ipvlan_mac_hash(ha->addr), mc_filters);
 262
 263                 /* Turn-on broadcast bit irrespective of address family,
 264                  * since broadcast is deferred to a work-queue, hence no
 265                  * impact on fast-path processing.
 266                  */
 267                 __set_bit(ipvlan_mac_hash(dev->broadcast), mc_filters);
 268
 269                 bitmap_copy(ipvlan->mac_filters, mc_filters,
 270                             IPVLAN_MAC_FILTER_SIZE);
 271         }
 272         dev_uc_sync(ipvlan->phy_dev, dev);
 273         dev_mc_sync(ipvlan->phy_dev, dev);
 274 }
 275
 276 static void ipvlan_get_stats64(struct net_device *dev,
 277                                struct rtnl_link_stats64 *s)
 278 {
 279         struct ipvl_dev *ipvlan = netdev_priv(dev);
 280
 281         if (ipvlan->pcpu_stats) {
 282                 struct ipvl_pcpu_stats *pcptr;
 283                 u64 rx_pkts, rx_bytes, rx_mcast, tx_pkts, tx_bytes;
 284                 u32 rx_errs = 0, tx_drps = 0;
 285                 u32 strt;
 286                 int idx;
 287
 288                 for_each_possible_cpu(idx) {
 289                         pcptr = per_cpu_ptr(ipvlan->pcpu_stats, idx);
 290                         do {
 291                                 strt= u64_stats_fetch_begin_irq(&pcptr->syncp);
 292                                 rx_pkts = pcptr->rx_pkts;
 293                                 rx_bytes = pcptr->rx_bytes;
 294                                 rx_mcast = pcptr->rx_mcast;
 295                                 tx_pkts = pcptr->tx_pkts;
 296                                 tx_bytes = pcptr->tx_bytes;
 297                         } while (u64_stats_fetch_retry_irq(&pcptr->syncp,
 298                                                            strt));
 299
 300                         s->rx_packets += rx_pkts;
 301                         s->rx_bytes += rx_bytes;
 302                         s->multicast += rx_mcast;
 303                         s->tx_packets += tx_pkts;
 304                         s->tx_bytes += tx_bytes;
 305
 306                         /* u32 values are updated without syncp protection. */
 307                         rx_errs += pcptr->rx_errs;
 308                         tx_drps += pcptr->tx_drps;
 309                 }
 310                 s->rx_errors = rx_errs;
 311                 s->rx_dropped = rx_errs;
 312                 s->tx_dropped = tx_drps;
 313         }
 314 }
 315
 316 static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid)
 317 {
 318         struct ipvl_dev *ipvlan = netdev_priv(dev);
 319         struct net_device *phy_dev = ipvlan->phy_dev;
 320
 321         return vlan_vid_add(phy_dev, proto, vid);
 322 }
 323
 324 static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
 325                                    u16 vid)
 326 {
 327         struct ipvl_dev *ipvlan = netdev_priv(dev);
 328         struct net_device *phy_dev = ipvlan->phy_dev;
 329
 330         vlan_vid_del(phy_dev, proto, vid);
 331         return 0;
 332 }
 333
 334 static int ipvlan_get_iflink(const struct net_device *dev)
 335 {
 336         struct ipvl_dev *ipvlan = netdev_priv(dev);
 337
 338         return ipvlan->phy_dev->ifindex;
 339 }
 340
 341 static const struct net_device_ops ipvlan_netdev_ops = {
 342         .ndo_init               = ipvlan_init,
 343         .ndo_uninit             = ipvlan_uninit,
 344         .ndo_open               = ipvlan_open,
 345         .ndo_stop               = ipvlan_stop,
 346         .ndo_start_xmit         = ipvlan_start_xmit,
 347         .ndo_fix_features       = ipvlan_fix_features,
 348         .ndo_change_rx_flags    = ipvlan_change_rx_flags,
 349         .ndo_set_rx_mode        = ipvlan_set_multicast_mac_filter,
 350         .ndo_get_stats64        = ipvlan_get_stats64,
 351         .ndo_vlan_rx_add_vid    = ipvlan_vlan_rx_add_vid,
 352         .ndo_vlan_rx_kill_vid   = ipvlan_vlan_rx_kill_vid,
 353         .ndo_get_iflink         = ipvlan_get_iflink,
 354 };
 355
 356 static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
 357                               unsigned short type, const void *daddr,
 358                               const void *saddr, unsigned len)
 359 {
 360         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 361         struct net_device *phy_dev = ipvlan->phy_dev;
 362
 363         /* TODO Probably use a different field than dev_addr so that the
 364          * mac-address on the virtual device is portable and can be carried
 365          * while the packets use the mac-addr on the physical device.
 366          */
 367         return dev_hard_header(skb, phy_dev, type, daddr,
 368                                saddr ? : phy_dev->dev_addr, len);
 369 }
 370
 371 static const struct header_ops ipvlan_header_ops = {
 372         .create         = ipvlan_hard_header,
 373         .parse          = eth_header_parse,
 374         .cache          = eth_header_cache,
 375         .cache_update   = eth_header_cache_update,
 376 };
 377
 378 static void ipvlan_adjust_mtu(struct ipvl_dev *ipvlan, struct net_device *dev)
 379 {
 380         ipvlan->dev->mtu = dev->mtu;
 381 }
 382
 383 static bool netif_is_ipvlan(const struct net_device *dev)
 384 {
 385         /* both ipvlan and ipvtap devices use the same netdev_ops */
 386         return dev->netdev_ops == &ipvlan_netdev_ops;
 387 }
 388
 389 static int ipvlan_ethtool_get_link_ksettings(struct net_device *dev,
 390                                              struct ethtool_link_ksettings *cmd)
 391 {
 392         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 393
 394         return __ethtool_get_link_ksettings(ipvlan->phy_dev, cmd);
 395 }
 396
 397 static void ipvlan_ethtool_get_drvinfo(struct net_device *dev,
 398                                        struct ethtool_drvinfo *drvinfo)
 399 {
 400         strlcpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver));
 401         strlcpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version));
 402 }
 403
 404 static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev)
 405 {
 406         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 407
 408         return ipvlan->msg_enable;
 409 }
 410
 411 static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value)
 412 {
 413         struct ipvl_dev *ipvlan = netdev_priv(dev);
 414
 415         ipvlan->msg_enable = value;
 416 }
 417
 418 static const struct ethtool_ops ipvlan_ethtool_ops = {
 419         .get_link       = ethtool_op_get_link,
 420         .get_link_ksettings     = ipvlan_ethtool_get_link_ksettings,
 421         .get_drvinfo    = ipvlan_ethtool_get_drvinfo,
 422         .get_msglevel   = ipvlan_ethtool_get_msglevel,
 423         .set_msglevel   = ipvlan_ethtool_set_msglevel,
 424 };
 425
 426 static int ipvlan_nl_changelink(struct net_device *dev,
 427                                 struct nlattr *tb[], struct nlattr *data[],
 428                                 struct netlink_ext_ack *extack)
 429 {
 430         struct ipvl_dev *ipvlan = netdev_priv(dev);
 431         struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
 432         int err = 0;
 433
 434         if (!data)
 435                 return 0;
 436         if (!ns_capable(dev_net(ipvlan->phy_dev)->user_ns, CAP_NET_ADMIN))
 437                 return -EPERM;
 438
 439         if (data[IFLA_IPVLAN_MODE]) {
 440                 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
 441
 442                 err = ipvlan_set_port_mode(port, nmode, extack);
 443         }
 444
 445         if (!err && data[IFLA_IPVLAN_FLAGS]) {
 446                 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
 447
 448                 if (flags & IPVLAN_F_PRIVATE)
 449                         ipvlan_mark_private(port);
 450                 else
 451                         ipvlan_clear_private(port);
 452
 453                 if (flags & IPVLAN_F_VEPA)
 454                         ipvlan_mark_vepa(port);
 455                 else
 456                         ipvlan_clear_vepa(port);
 457         }
 458
 459         return err;
 460 }
 461
 462 static size_t ipvlan_nl_getsize(const struct net_device *dev)
 463 {
 464         return (0
 465                 + nla_total_size(2) /* IFLA_IPVLAN_MODE */
 466                 + nla_total_size(2) /* IFLA_IPVLAN_FLAGS */
 467                 );
 468 }
 469
 470 static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[],
 471                               struct netlink_ext_ack *extack)
 472 {
 473         if (!data)
 474                 return 0;
 475
 476         if (data[IFLA_IPVLAN_MODE]) {
 477                 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
 478
 479                 if (mode >= IPVLAN_MODE_MAX)
 480                         return -EINVAL;
 481         }
 482         if (data[IFLA_IPVLAN_FLAGS]) {
 483                 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
 484
 485                 /* Only two bits are used at this moment. */
 486                 if (flags & ~(IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
 487                         return -EINVAL;
 488                 /* Also both flags can't be active at the same time. */
 489                 if ((flags & (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) ==
 490                     (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
 491                         return -EINVAL;
 492         }
 493
 494         return 0;
 495 }
 496
 497 static int ipvlan_nl_fillinfo(struct sk_buff *skb,
 498                               const struct net_device *dev)
 499 {
 500         struct ipvl_dev *ipvlan = netdev_priv(dev);
 501         struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
 502         int ret = -EINVAL;
 503
 504         if (!port)
 505                 goto err;
 506
 507         ret = -EMSGSIZE;
 508         if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode))
 509                 goto err;
 510         if (nla_put_u16(skb, IFLA_IPVLAN_FLAGS, port->flags))
 511                 goto err;
 512
 513         return 0;
 514
 515 err:
 516         return ret;
 517 }
 518
 519 int ipvlan_link_new(struct net *src_net, struct net_device *dev,
 520                     struct nlattr *tb[], struct nlattr *data[],
 521                     struct netlink_ext_ack *extack)
 522 {
 523         struct ipvl_dev *ipvlan = netdev_priv(dev);
 524         struct ipvl_port *port;
 525         struct net_device *phy_dev;
 526         int err;
 527         u16 mode = IPVLAN_MODE_L3;
 528
 529         if (!tb[IFLA_LINK])
 530                 return -EINVAL;
 531
 532         phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
 533         if (!phy_dev)
 534                 return -ENODEV;
 535
 536         if (netif_is_ipvlan(phy_dev)) {
 537                 struct ipvl_dev *tmp = netdev_priv(phy_dev);
 538
 539                 phy_dev = tmp->phy_dev;
 540                 if (!ns_capable(dev_net(phy_dev)->user_ns, CAP_NET_ADMIN))
 541                         return -EPERM;
 542         } else if (!netif_is_ipvlan_port(phy_dev)) {
 543                 /* Exit early if the underlying link is invalid or busy */
 544                 if (phy_dev->type != ARPHRD_ETHER ||
 545                     phy_dev->flags & IFF_LOOPBACK) {
 546                         netdev_err(phy_dev,
 547                                    "Master is either lo or non-ether device\n");
 548                         return -EINVAL;
 549                 }
 550
 551                 if (netdev_is_rx_handler_busy(phy_dev)) {
 552                         netdev_err(phy_dev, "Device is already in use.\n");
 553                         return -EBUSY;
 554                 }
 555         }
 556
 557         ipvlan->phy_dev = phy_dev;
 558         ipvlan->dev = dev;
 559         ipvlan->sfeatures = IPVLAN_FEATURES;
 560         if (!tb[IFLA_MTU])
 561                 ipvlan_adjust_mtu(ipvlan, phy_dev);
 562         INIT_LIST_HEAD(&ipvlan->addrs);
 563         spin_lock_init(&ipvlan->addrs_lock);
 564
 565         /* TODO Probably put random address here to be presented to the
 566          * world but keep using the physical-dev address for the outgoing
 567          * packets.
 568          */
 569         memcpy(dev->dev_addr, phy_dev->dev_addr, ETH_ALEN);
 570
 571         dev->priv_flags |= IFF_NO_RX_HANDLER;
 572
 573         err = register_netdevice(dev);
 574         if (err < 0)
 575                 return err;
 576
 577         /* ipvlan_init() would have created the port, if required */
 578         port = ipvlan_port_get_rtnl(phy_dev);
 579         ipvlan->port = port;
 580
 581         /* If the port-id base is at the MAX value, then wrap it around and
 582          * begin from 0x1 again. This may be due to a busy system where lots
 583          * of slaves are getting created and deleted.
 584          */
 585         if (port->dev_id_start == 0xFFFE)
 586                 port->dev_id_start = 0x1;
 587
 588         /* Since L2 address is shared among all IPvlan slaves including
 589          * master, use unique 16 bit dev-ids to diffentiate among them.
 590          * Assign IDs between 0x1 and 0xFFFE (used by the master) to each
 591          * slave link [see addrconf_ifid_eui48()].
 592          */
 593         err = ida_simple_get(&port->ida, port->dev_id_start, 0xFFFE,
 594                              GFP_KERNEL);
 595         if (err < 0)
 596                 err = ida_simple_get(&port->ida, 0x1, port->dev_id_start,
 597                                      GFP_KERNEL);
 598         if (err < 0)
 599                 goto unregister_netdev;
 600         dev->dev_id = err;
 601
 602         /* Increment id-base to the next slot for the future assignment */
 603         port->dev_id_start = err + 1;
 604
 605         err = netdev_upper_dev_link(phy_dev, dev, extack);
 606         if (err)
 607                 goto remove_ida;
 608
 609         /* Flags are per port and latest update overrides. User has
 610          * to be consistent in setting it just like the mode attribute.
 611          */
 612         if (data && data[IFLA_IPVLAN_FLAGS])
 613                 port->flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
 614
 615         if (data && data[IFLA_IPVLAN_MODE])
 616                 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
 617
 618         err = ipvlan_set_port_mode(port, mode, extack);
 619         if (err)
 620                 goto unlink_netdev;
 621
 622         list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans);
 623         netif_stacked_transfer_operstate(phy_dev, dev);
 624         return 0;
 625
 626 unlink_netdev:
 627         netdev_upper_dev_unlink(phy_dev, dev);
 628 remove_ida:
 629         ida_simple_remove(&port->ida, dev->dev_id);
 630 unregister_netdev:
 631         unregister_netdevice(dev);
 632         return err;
 633 }
 634 EXPORT_SYMBOL_GPL(ipvlan_link_new);
 635
 636 void ipvlan_link_delete(struct net_device *dev, struct list_head *head)
 637 {
 638         struct ipvl_dev *ipvlan = netdev_priv(dev);
 639         struct ipvl_addr *addr, *next;
 640
 641         spin_lock_bh(&ipvlan->addrs_lock);
 642         list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) {
 643                 ipvlan_ht_addr_del(addr);
 644                 list_del_rcu(&addr->anode);
 645                 kfree_rcu(addr, rcu);
 646         }
 647         spin_unlock_bh(&ipvlan->addrs_lock);
 648
 649         ida_simple_remove(&ipvlan->port->ida, dev->dev_id);
 650         list_del_rcu(&ipvlan->pnode);
 651         unregister_netdevice_queue(dev, head);
 652         netdev_upper_dev_unlink(ipvlan->phy_dev, dev);
 653 }
 654 EXPORT_SYMBOL_GPL(ipvlan_link_delete);
 655
 656 void ipvlan_link_setup(struct net_device *dev)
 657 {
 658         ether_setup(dev);
 659
 660         dev->max_mtu = ETH_MAX_MTU;
 661         dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
 662         dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE;
 663         dev->netdev_ops = &ipvlan_netdev_ops;
 664         dev->needs_free_netdev = true;
 665         dev->header_ops = &ipvlan_header_ops;
 666         dev->ethtool_ops = &ipvlan_ethtool_ops;
 667 }
 668 EXPORT_SYMBOL_GPL(ipvlan_link_setup);
 669
 670 static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] =
 671 {
 672         [IFLA_IPVLAN_MODE] = { .type = NLA_U16 },
 673         [IFLA_IPVLAN_FLAGS] = { .type = NLA_U16 },
 674 };
 675
 676 static struct rtnl_link_ops ipvlan_link_ops = {
 677         .kind           = "ipvlan",
 678         .priv_size      = sizeof(struct ipvl_dev),
 679
 680         .setup          = ipvlan_link_setup,
 681         .newlink        = ipvlan_link_new,
 682         .dellink        = ipvlan_link_delete,
 683 };
 684
 685 int ipvlan_link_register(struct rtnl_link_ops *ops)
 686 {
 687         ops->get_size   = ipvlan_nl_getsize;
 688         ops->policy     = ipvlan_nl_policy;
 689         ops->validate   = ipvlan_nl_validate;
 690         ops->fill_info  = ipvlan_nl_fillinfo;
 691         ops->changelink = ipvlan_nl_changelink;
 692         ops->maxtype    = IFLA_IPVLAN_MAX;
 693         return rtnl_link_register(ops);
 694 }
 695 EXPORT_SYMBOL_GPL(ipvlan_link_register);
 696
 697 static int ipvlan_device_event(struct notifier_block *unused,
 698                                unsigned long event, void *ptr)
 699 {
 700         struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr);
 701         struct netdev_notifier_pre_changeaddr_info *prechaddr_info;
 702         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 703         struct ipvl_dev *ipvlan, *next;
 704         struct ipvl_port *port;
 705         LIST_HEAD(lst_kill);
 706         int err;
 707
 708         if (!netif_is_ipvlan_port(dev))
 709                 return NOTIFY_DONE;
 710
 711         port = ipvlan_port_get_rtnl(dev);
 712
 713         switch (event) {
 714         case NETDEV_CHANGE:
 715                 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
 716                         netif_stacked_transfer_operstate(ipvlan->phy_dev,
 717                                                          ipvlan->dev);
 718                 break;
 719
 720         case NETDEV_REGISTER: {
 721                 struct net *oldnet, *newnet = dev_net(dev);
 722
 723                 oldnet = read_pnet(&port->pnet);
 724                 if (net_eq(newnet, oldnet))
 725                         break;
 726
 727                 write_pnet(&port->pnet, newnet);
 728
 729                 ipvlan_migrate_l3s_hook(oldnet, newnet);
 730                 break;
 731         }
 732         case NETDEV_UNREGISTER:
 733                 if (dev->reg_state != NETREG_UNREGISTERING)
 734                         break;
 735
 736                 list_for_each_entry_safe(ipvlan, next, &port->ipvlans, pnode)
 737                         ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev,
 738                                                             &lst_kill);
 739                 unregister_netdevice_many(&lst_kill);
 740                 break;
 741
 742         case NETDEV_FEAT_CHANGE:
 743                 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
 744                         ipvlan->dev->features = dev->features & IPVLAN_FEATURES;
 745                         ipvlan->dev->gso_max_size = dev->gso_max_size;
 746                         ipvlan->dev->gso_max_segs = dev->gso_max_segs;
 747                         netdev_features_change(ipvlan->dev);
 748                 }
 749                 break;
 750
 751         case NETDEV_CHANGEMTU:
 752                 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
 753                         ipvlan_adjust_mtu(ipvlan, dev);
 754                 break;
 755
 756         case NETDEV_PRE_CHANGEADDR:
 757                 prechaddr_info = ptr;
 758                 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
 759                         err = dev_pre_changeaddr_notify(ipvlan->dev,
 760                                                     prechaddr_info->dev_addr,
 761                                                     extack);
 762                         if (err)
 763                                 return notifier_from_errno(err);
 764                 }
 765                 break;
 766
 767         case NETDEV_CHANGEADDR:
 768                 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
 769                         ether_addr_copy(ipvlan->dev->dev_addr, dev->dev_addr);
 770                         call_netdevice_notifiers(NETDEV_CHANGEADDR, ipvlan->dev);
 771                 }
 772                 break;
 773
 774         case NETDEV_PRE_TYPE_CHANGE:
 775                 /* Forbid underlying device to change its type. */
 776                 return NOTIFY_BAD;
 777         }
 778         return NOTIFY_DONE;
 779 }
 780
 781 /* the caller must held the addrs lock */
 782 static int ipvlan_add_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
 783 {
 784         struct ipvl_addr *addr;
 785
 786         addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC);
 787         if (!addr)
 788                 return -ENOMEM;
 789
 790         addr->master = ipvlan;
 791         if (!is_v6) {
 792                 memcpy(&addr->ip4addr, iaddr, sizeof(struct in_addr));
 793                 addr->atype = IPVL_IPV4;
 794 #if IS_ENABLED(CONFIG_IPV6)
 795         } else {
 796                 memcpy(&addr->ip6addr, iaddr, sizeof(struct in6_addr));
 797                 addr->atype = IPVL_IPV6;
 798 #endif
 799         }
 800
 801         list_add_tail_rcu(&addr->anode, &ipvlan->addrs);
 802
 803         /* If the interface is not up, the address will be added to the hash
 804          * list by ipvlan_open.
 805          */
 806         if (netif_running(ipvlan->dev))
 807                 ipvlan_ht_addr_add(ipvlan, addr);
 808
 809         return 0;
 810 }
 811
 812 static void ipvlan_del_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
 813 {
 814         struct ipvl_addr *addr;
 815
 816         spin_lock_bh(&ipvlan->addrs_lock);
 817         addr = ipvlan_find_addr(ipvlan, iaddr, is_v6);
 818         if (!addr) {
 819                 spin_unlock_bh(&ipvlan->addrs_lock);
 820                 return;
 821         }
 822
 823         ipvlan_ht_addr_del(addr);
 824         list_del_rcu(&addr->anode);
 825         spin_unlock_bh(&ipvlan->addrs_lock);
 826         kfree_rcu(addr, rcu);
 827 }
 828
 829 static bool ipvlan_is_valid_dev(const struct net_device *dev)
 830 {
 831         struct ipvl_dev *ipvlan = netdev_priv(dev);
 832
 833         if (!netif_is_ipvlan(dev))
 834                 return false;
 835
 836         if (!ipvlan || !ipvlan->port)
 837                 return false;
 838
 839         return true;
 840 }
 841
 842 #if IS_ENABLED(CONFIG_IPV6)
 843 static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
 844 {
 845         int ret = -EINVAL;
 846
 847         spin_lock_bh(&ipvlan->addrs_lock);
 848         if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true))
 849                 netif_err(ipvlan, ifup, ipvlan->dev,
 850                           "Failed to add IPv6=%pI6c addr for %s intf\n",
 851                           ip6_addr, ipvlan->dev->name);
 852         else
 853                 ret = ipvlan_add_addr(ipvlan, ip6_addr, true);
 854         spin_unlock_bh(&ipvlan->addrs_lock);
 855         return ret;
 856 }
 857
 858 static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
 859 {
 860         return ipvlan_del_addr(ipvlan, ip6_addr, true);
 861 }
 862
 863 static int ipvlan_addr6_event(struct notifier_block *unused,
 864                               unsigned long event, void *ptr)
 865 {
 866         struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr;
 867         struct net_device *dev = (struct net_device *)if6->idev->dev;
 868         struct ipvl_dev *ipvlan = netdev_priv(dev);
 869
 870         if (!ipvlan_is_valid_dev(dev))
 871                 return NOTIFY_DONE;
 872
 873         switch (event) {
 874         case NETDEV_UP:
 875                 if (ipvlan_add_addr6(ipvlan, &if6->addr))
 876                         return NOTIFY_BAD;
 877                 break;
 878
 879         case NETDEV_DOWN:
 880                 ipvlan_del_addr6(ipvlan, &if6->addr);
 881                 break;
 882         }
 883
 884         return NOTIFY_OK;
 885 }
 886
 887 static int ipvlan_addr6_validator_event(struct notifier_block *unused,
 888                                         unsigned long event, void *ptr)
 889 {
 890         struct in6_validator_info *i6vi = (struct in6_validator_info *)ptr;
 891         struct net_device *dev = (struct net_device *)i6vi->i6vi_dev->dev;
 892         struct ipvl_dev *ipvlan = netdev_priv(dev);
 893
 894         if (!ipvlan_is_valid_dev(dev))
 895                 return NOTIFY_DONE;
 896
 897         switch (event) {
 898         case NETDEV_UP:
 899                 if (ipvlan_addr_busy(ipvlan->port, &i6vi->i6vi_addr, true)) {
 900                         NL_SET_ERR_MSG(i6vi->extack,
 901                                        "Address already assigned to an ipvlan device");
 902                         return notifier_from_errno(-EADDRINUSE);
 903                 }
 904                 break;
 905         }
 906
 907         return NOTIFY_OK;
 908 }
 909 #endif
 910
 911 static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
 912 {
 913         int ret = -EINVAL;
 914
 915         spin_lock_bh(&ipvlan->addrs_lock);
 916         if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false))
 917                 netif_err(ipvlan, ifup, ipvlan->dev,
 918                           "Failed to add IPv4=%pI4 on %s intf.\n",
 919                           ip4_addr, ipvlan->dev->name);
 920         else
 921                 ret = ipvlan_add_addr(ipvlan, ip4_addr, false);
 922         spin_unlock_bh(&ipvlan->addrs_lock);
 923         return ret;
 924 }
 925
 926 static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
 927 {
 928         return ipvlan_del_addr(ipvlan, ip4_addr, false);
 929 }
 930
 931 static int ipvlan_addr4_event(struct notifier_block *unused,
 932                               unsigned long event, void *ptr)
 933 {
 934         struct in_ifaddr *if4 = (struct in_ifaddr *)ptr;
 935         struct net_device *dev = (struct net_device *)if4->ifa_dev->dev;
 936         struct ipvl_dev *ipvlan = netdev_priv(dev);
 937         struct in_addr ip4_addr;
 938
 939         if (!ipvlan_is_valid_dev(dev))
 940                 return NOTIFY_DONE;
 941
 942         switch (event) {
 943         case NETDEV_UP:
 944                 ip4_addr.s_addr = if4->ifa_address;
 945                 if (ipvlan_add_addr4(ipvlan, &ip4_addr))
 946                         return NOTIFY_BAD;
 947                 break;
 948
 949         case NETDEV_DOWN:
 950                 ip4_addr.s_addr = if4->ifa_address;
 951                 ipvlan_del_addr4(ipvlan, &ip4_addr);
 952                 break;
 953         }
 954
 955         return NOTIFY_OK;
 956 }
 957
 958 static int ipvlan_addr4_validator_event(struct notifier_block *unused,
 959                                         unsigned long event, void *ptr)
 960 {
 961         struct in_validator_info *ivi = (struct in_validator_info *)ptr;
 962         struct net_device *dev = (struct net_device *)ivi->ivi_dev->dev;
 963         struct ipvl_dev *ipvlan = netdev_priv(dev);
 964
 965         if (!ipvlan_is_valid_dev(dev))
 966                 return NOTIFY_DONE;
 967
 968         switch (event) {
 969         case NETDEV_UP:
 970                 if (ipvlan_addr_busy(ipvlan->port, &ivi->ivi_addr, false)) {
 971                         NL_SET_ERR_MSG(ivi->extack,
 972                                        "Address already assigned to an ipvlan device");
 973                         return notifier_from_errno(-EADDRINUSE);
 974                 }
 975                 break;
 976         }
 977
 978         return NOTIFY_OK;
 979 }
 980
 981 static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = {
 982         .notifier_call = ipvlan_addr4_event,
 983 };
 984
 985 static struct notifier_block ipvlan_addr4_vtor_notifier_block __read_mostly = {
 986         .notifier_call = ipvlan_addr4_validator_event,
 987 };
 988
 989 static struct notifier_block ipvlan_notifier_block __read_mostly = {
 990         .notifier_call = ipvlan_device_event,
 991 };
 992
 993 #if IS_ENABLED(CONFIG_IPV6)
 994 static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = {
 995         .notifier_call = ipvlan_addr6_event,
 996 };
 997
 998 static struct notifier_block ipvlan_addr6_vtor_notifier_block __read_mostly = {
 999         .notifier_call = ipvlan_addr6_validator_event,
1000 };
1001 #endif
1002
1003 static int __init ipvlan_init_module(void)
1004 {
1005         int err;
1006
1007         ipvlan_init_secret();
1008         register_netdevice_notifier(&ipvlan_notifier_block);
1009 #if IS_ENABLED(CONFIG_IPV6)
1010         register_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1011         register_inet6addr_validator_notifier(
1012             &ipvlan_addr6_vtor_notifier_block);
1013 #endif
1014         register_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1015         register_inetaddr_validator_notifier(&ipvlan_addr4_vtor_notifier_block);
1016
1017         err = ipvlan_l3s_init();
1018         if (err < 0)
1019                 goto error;
1020
1021         err = ipvlan_link_register(&ipvlan_link_ops);
1022         if (err < 0) {
1023                 ipvlan_l3s_cleanup();
1024                 goto error;
1025         }
1026
1027         return 0;
1028 error:
1029         unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1030         unregister_inetaddr_validator_notifier(
1031             &ipvlan_addr4_vtor_notifier_block);
1032 #if IS_ENABLED(CONFIG_IPV6)
1033         unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1034         unregister_inet6addr_validator_notifier(
1035             &ipvlan_addr6_vtor_notifier_block);
1036 #endif
1037         unregister_netdevice_notifier(&ipvlan_notifier_block);
1038         return err;
1039 }
1040
1041 static void __exit ipvlan_cleanup_module(void)
1042 {
1043         rtnl_link_unregister(&ipvlan_link_ops);
1044         ipvlan_l3s_cleanup();
1045         unregister_netdevice_notifier(&ipvlan_notifier_block);
1046         unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1047         unregister_inetaddr_validator_notifier(
1048             &ipvlan_addr4_vtor_notifier_block);
1049 #if IS_ENABLED(CONFIG_IPV6)
1050         unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1051         unregister_inet6addr_validator_notifier(
1052             &ipvlan_addr6_vtor_notifier_block);
1053 #endif
1054 }
1055
1056 module_init(ipvlan_init_module);
1057 module_exit(ipvlan_cleanup_module);
1058
1059 MODULE_LICENSE("GPL");
1060 MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>");
1061 MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs");
1062 MODULE_ALIAS_RTNL_LINK("ipvlan");