drivers/net/ipvlan/ipvlan_main.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /* Copyright (c) 2014 Mahesh Bandewar <maheshb@google.com>
   3  */
   4
   5 #include "ipvlan.h"
   6
   7 static int ipvlan_set_port_mode(struct ipvl_port *port, u16 nval,
   8                                 struct netlink_ext_ack *extack)
   9 {
  10         struct ipvl_dev *ipvlan;
  11         unsigned int flags;
  12         int err;
  13
  14         ASSERT_RTNL();
  15         if (port->mode != nval) {
  16                 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
  17                         flags = ipvlan->dev->flags;
  18                         if (nval == IPVLAN_MODE_L3 || nval == IPVLAN_MODE_L3S) {
  19                                 err = dev_change_flags(ipvlan->dev,
  20                                                        flags | IFF_NOARP,
  21                                                        extack);
  22                         } else {
  23                                 err = dev_change_flags(ipvlan->dev,
  24                                                        flags & ~IFF_NOARP,
  25                                                        extack);
  26                         }
  27                         if (unlikely(err))
  28                                 goto fail;
  29                 }
  30                 if (nval == IPVLAN_MODE_L3S) {
  31                         /* New mode is L3S */
  32                         err = ipvlan_l3s_register(port);
  33                         if (err)
  34                                 goto fail;
  35                 } else if (port->mode == IPVLAN_MODE_L3S) {
  36                         /* Old mode was L3S */
  37                         ipvlan_l3s_unregister(port);
  38                 }
  39                 port->mode = nval;
  40         }
  41         return 0;
  42
  43 fail:
  44         /* Undo the flags changes that have been done so far. */
  45         list_for_each_entry_continue_reverse(ipvlan, &port->ipvlans, pnode) {
  46                 flags = ipvlan->dev->flags;
  47                 if (port->mode == IPVLAN_MODE_L3 ||
  48                     port->mode == IPVLAN_MODE_L3S)
  49                         dev_change_flags(ipvlan->dev, flags | IFF_NOARP,
  50                                          NULL);
  51                 else
  52                         dev_change_flags(ipvlan->dev, flags & ~IFF_NOARP,
  53                                          NULL);
  54         }
  55
  56         return err;
  57 }
  58
  59 static int ipvlan_port_create(struct net_device *dev)
  60 {
  61         struct ipvl_port *port;
  62         int err, idx;
  63
  64         port = kzalloc(sizeof(struct ipvl_port), GFP_KERNEL);
  65         if (!port)
  66                 return -ENOMEM;
  67
  68         write_pnet(&port->pnet, dev_net(dev));
  69         port->dev = dev;
  70         port->mode = IPVLAN_MODE_L3;
  71         INIT_LIST_HEAD(&port->ipvlans);
  72         for (idx = 0; idx < IPVLAN_HASH_SIZE; idx++)
  73                 INIT_HLIST_HEAD(&port->hlhead[idx]);
  74
  75         skb_queue_head_init(&port->backlog);
  76         INIT_WORK(&port->wq, ipvlan_process_multicast);
  77         ida_init(&port->ida);
  78         port->dev_id_start = 1;
  79
  80         err = netdev_rx_handler_register(dev, ipvlan_handle_frame, port);
  81         if (err)
  82                 goto err;
  83
  84         return 0;
  85
  86 err:
  87         kfree(port);
  88         return err;
  89 }
  90
  91 static void ipvlan_port_destroy(struct net_device *dev)
  92 {
  93         struct ipvl_port *port = ipvlan_port_get_rtnl(dev);
  94         struct sk_buff *skb;
  95
  96         if (port->mode == IPVLAN_MODE_L3S)
  97                 ipvlan_l3s_unregister(port);
  98         netdev_rx_handler_unregister(dev);
  99         cancel_work_sync(&port->wq);
 100         while ((skb = __skb_dequeue(&port->backlog)) != NULL) {
 101                 if (skb->dev)
 102                         dev_put(skb->dev);
 103                 kfree_skb(skb);
 104         }
 105         ida_destroy(&port->ida);
 106         kfree(port);
 107 }
 108
 109 #define IPVLAN_FEATURES \
 110         (NETIF_F_SG | NETIF_F_CSUM_MASK | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
 111          NETIF_F_GSO | NETIF_F_ALL_TSO | NETIF_F_GSO_ROBUST | \
 112          NETIF_F_GRO | NETIF_F_RXCSUM | \
 113          NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
 114
 115 #define IPVLAN_STATE_MASK \
 116         ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
 117
 118 static int ipvlan_init(struct net_device *dev)
 119 {
 120         struct ipvl_dev *ipvlan = netdev_priv(dev);
 121         struct net_device *phy_dev = ipvlan->phy_dev;
 122         struct ipvl_port *port;
 123         int err;
 124
 125         dev->state = (dev->state & ~IPVLAN_STATE_MASK) |
 126                      (phy_dev->state & IPVLAN_STATE_MASK);
 127         dev->features = phy_dev->features & IPVLAN_FEATURES;
 128         dev->features |= NETIF_F_LLTX | NETIF_F_VLAN_CHALLENGED;
 129         dev->hw_enc_features |= dev->features;
 130         dev->gso_max_size = phy_dev->gso_max_size;
 131         dev->gso_max_segs = phy_dev->gso_max_segs;
 132         dev->hard_header_len = phy_dev->hard_header_len;
 133
 134         netdev_lockdep_set_classes(dev);
 135
 136         ipvlan->pcpu_stats = netdev_alloc_pcpu_stats(struct ipvl_pcpu_stats);
 137         if (!ipvlan->pcpu_stats)
 138                 return -ENOMEM;
 139
 140         if (!netif_is_ipvlan_port(phy_dev)) {
 141                 err = ipvlan_port_create(phy_dev);
 142                 if (err < 0) {
 143                         free_percpu(ipvlan->pcpu_stats);
 144                         return err;
 145                 }
 146         }
 147         port = ipvlan_port_get_rtnl(phy_dev);
 148         port->count += 1;
 149         return 0;
 150 }
 151
 152 static void ipvlan_uninit(struct net_device *dev)
 153 {
 154         struct ipvl_dev *ipvlan = netdev_priv(dev);
 155         struct net_device *phy_dev = ipvlan->phy_dev;
 156         struct ipvl_port *port;
 157
 158         free_percpu(ipvlan->pcpu_stats);
 159
 160         port = ipvlan_port_get_rtnl(phy_dev);
 161         port->count -= 1;
 162         if (!port->count)
 163                 ipvlan_port_destroy(port->dev);
 164 }
 165
 166 static int ipvlan_open(struct net_device *dev)
 167 {
 168         struct ipvl_dev *ipvlan = netdev_priv(dev);
 169         struct ipvl_addr *addr;
 170
 171         if (ipvlan->port->mode == IPVLAN_MODE_L3 ||
 172             ipvlan->port->mode == IPVLAN_MODE_L3S)
 173                 dev->flags |= IFF_NOARP;
 174         else
 175                 dev->flags &= ~IFF_NOARP;
 176
 177         rcu_read_lock();
 178         list_for_each_entry_rcu(addr, &ipvlan->addrs, anode)
 179                 ipvlan_ht_addr_add(ipvlan, addr);
 180         rcu_read_unlock();
 181
 182         return 0;
 183 }
 184
 185 static int ipvlan_stop(struct net_device *dev)
 186 {
 187         struct ipvl_dev *ipvlan = netdev_priv(dev);
 188         struct net_device *phy_dev = ipvlan->phy_dev;
 189         struct ipvl_addr *addr;
 190
 191         dev_uc_unsync(phy_dev, dev);
 192         dev_mc_unsync(phy_dev, dev);
 193
 194         rcu_read_lock();
 195         list_for_each_entry_rcu(addr, &ipvlan->addrs, anode)
 196                 ipvlan_ht_addr_del(addr);
 197         rcu_read_unlock();
 198
 199         return 0;
 200 }
 201
 202 static netdev_tx_t ipvlan_start_xmit(struct sk_buff *skb,
 203                                      struct net_device *dev)
 204 {
 205         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 206         int skblen = skb->len;
 207         int ret;
 208
 209         ret = ipvlan_queue_xmit(skb, dev);
 210         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 211                 struct ipvl_pcpu_stats *pcptr;
 212
 213                 pcptr = this_cpu_ptr(ipvlan->pcpu_stats);
 214
 215                 u64_stats_update_begin(&pcptr->syncp);
 216                 pcptr->tx_pkts++;
 217                 pcptr->tx_bytes += skblen;
 218                 u64_stats_update_end(&pcptr->syncp);
 219         } else {
 220                 this_cpu_inc(ipvlan->pcpu_stats->tx_drps);
 221         }
 222         return ret;
 223 }
 224
 225 static netdev_features_t ipvlan_fix_features(struct net_device *dev,
 226                                              netdev_features_t features)
 227 {
 228         struct ipvl_dev *ipvlan = netdev_priv(dev);
 229
 230         return features & (ipvlan->sfeatures | ~IPVLAN_FEATURES);
 231 }
 232
 233 static void ipvlan_change_rx_flags(struct net_device *dev, int change)
 234 {
 235         struct ipvl_dev *ipvlan = netdev_priv(dev);
 236         struct net_device *phy_dev = ipvlan->phy_dev;
 237
 238         if (change & IFF_ALLMULTI)
 239                 dev_set_allmulti(phy_dev, dev->flags & IFF_ALLMULTI? 1 : -1);
 240 }
 241
 242 static void ipvlan_set_multicast_mac_filter(struct net_device *dev)
 243 {
 244         struct ipvl_dev *ipvlan = netdev_priv(dev);
 245
 246         if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
 247                 bitmap_fill(ipvlan->mac_filters, IPVLAN_MAC_FILTER_SIZE);
 248         } else {
 249                 struct netdev_hw_addr *ha;
 250                 DECLARE_BITMAP(mc_filters, IPVLAN_MAC_FILTER_SIZE);
 251
 252                 bitmap_zero(mc_filters, IPVLAN_MAC_FILTER_SIZE);
 253                 netdev_for_each_mc_addr(ha, dev)
 254                         __set_bit(ipvlan_mac_hash(ha->addr), mc_filters);
 255
 256                 /* Turn-on broadcast bit irrespective of address family,
 257                  * since broadcast is deferred to a work-queue, hence no
 258                  * impact on fast-path processing.
 259                  */
 260                 __set_bit(ipvlan_mac_hash(dev->broadcast), mc_filters);
 261
 262                 bitmap_copy(ipvlan->mac_filters, mc_filters,
 263                             IPVLAN_MAC_FILTER_SIZE);
 264         }
 265         dev_uc_sync(ipvlan->phy_dev, dev);
 266         dev_mc_sync(ipvlan->phy_dev, dev);
 267 }
 268
 269 static void ipvlan_get_stats64(struct net_device *dev,
 270                                struct rtnl_link_stats64 *s)
 271 {
 272         struct ipvl_dev *ipvlan = netdev_priv(dev);
 273
 274         if (ipvlan->pcpu_stats) {
 275                 struct ipvl_pcpu_stats *pcptr;
 276                 u64 rx_pkts, rx_bytes, rx_mcast, tx_pkts, tx_bytes;
 277                 u32 rx_errs = 0, tx_drps = 0;
 278                 u32 strt;
 279                 int idx;
 280
 281                 for_each_possible_cpu(idx) {
 282                         pcptr = per_cpu_ptr(ipvlan->pcpu_stats, idx);
 283                         do {
 284                                 strt= u64_stats_fetch_begin_irq(&pcptr->syncp);
 285                                 rx_pkts = pcptr->rx_pkts;
 286                                 rx_bytes = pcptr->rx_bytes;
 287                                 rx_mcast = pcptr->rx_mcast;
 288                                 tx_pkts = pcptr->tx_pkts;
 289                                 tx_bytes = pcptr->tx_bytes;
 290                         } while (u64_stats_fetch_retry_irq(&pcptr->syncp,
 291                                                            strt));
 292
 293                         s->rx_packets += rx_pkts;
 294                         s->rx_bytes += rx_bytes;
 295                         s->multicast += rx_mcast;
 296                         s->tx_packets += tx_pkts;
 297                         s->tx_bytes += tx_bytes;
 298
 299                         /* u32 values are updated without syncp protection. */
 300                         rx_errs += pcptr->rx_errs;
 301                         tx_drps += pcptr->tx_drps;
 302                 }
 303                 s->rx_errors = rx_errs;
 304                 s->rx_dropped = rx_errs;
 305                 s->tx_dropped = tx_drps;
 306         }
 307 }
 308
 309 static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid)
 310 {
 311         struct ipvl_dev *ipvlan = netdev_priv(dev);
 312         struct net_device *phy_dev = ipvlan->phy_dev;
 313
 314         return vlan_vid_add(phy_dev, proto, vid);
 315 }
 316
 317 static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
 318                                    u16 vid)
 319 {
 320         struct ipvl_dev *ipvlan = netdev_priv(dev);
 321         struct net_device *phy_dev = ipvlan->phy_dev;
 322
 323         vlan_vid_del(phy_dev, proto, vid);
 324         return 0;
 325 }
 326
 327 static int ipvlan_get_iflink(const struct net_device *dev)
 328 {
 329         struct ipvl_dev *ipvlan = netdev_priv(dev);
 330
 331         return ipvlan->phy_dev->ifindex;
 332 }
 333
 334 static const struct net_device_ops ipvlan_netdev_ops = {
 335         .ndo_init               = ipvlan_init,
 336         .ndo_uninit             = ipvlan_uninit,
 337         .ndo_open               = ipvlan_open,
 338         .ndo_stop               = ipvlan_stop,
 339         .ndo_start_xmit         = ipvlan_start_xmit,
 340         .ndo_fix_features       = ipvlan_fix_features,
 341         .ndo_change_rx_flags    = ipvlan_change_rx_flags,
 342         .ndo_set_rx_mode        = ipvlan_set_multicast_mac_filter,
 343         .ndo_get_stats64        = ipvlan_get_stats64,
 344         .ndo_vlan_rx_add_vid    = ipvlan_vlan_rx_add_vid,
 345         .ndo_vlan_rx_kill_vid   = ipvlan_vlan_rx_kill_vid,
 346         .ndo_get_iflink         = ipvlan_get_iflink,
 347 };
 348
 349 static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
 350                               unsigned short type, const void *daddr,
 351                               const void *saddr, unsigned len)
 352 {
 353         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 354         struct net_device *phy_dev = ipvlan->phy_dev;
 355
 356         /* TODO Probably use a different field than dev_addr so that the
 357          * mac-address on the virtual device is portable and can be carried
 358          * while the packets use the mac-addr on the physical device.
 359          */
 360         return dev_hard_header(skb, phy_dev, type, daddr,
 361                                saddr ? : phy_dev->dev_addr, len);
 362 }
 363
 364 static const struct header_ops ipvlan_header_ops = {
 365         .create         = ipvlan_hard_header,
 366         .parse          = eth_header_parse,
 367         .cache          = eth_header_cache,
 368         .cache_update   = eth_header_cache_update,
 369 };
 370
 371 static void ipvlan_adjust_mtu(struct ipvl_dev *ipvlan, struct net_device *dev)
 372 {
 373         ipvlan->dev->mtu = dev->mtu;
 374 }
 375
 376 static bool netif_is_ipvlan(const struct net_device *dev)
 377 {
 378         /* both ipvlan and ipvtap devices use the same netdev_ops */
 379         return dev->netdev_ops == &ipvlan_netdev_ops;
 380 }
 381
 382 static int ipvlan_ethtool_get_link_ksettings(struct net_device *dev,
 383                                              struct ethtool_link_ksettings *cmd)
 384 {
 385         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 386
 387         return __ethtool_get_link_ksettings(ipvlan->phy_dev, cmd);
 388 }
 389
 390 static void ipvlan_ethtool_get_drvinfo(struct net_device *dev,
 391                                        struct ethtool_drvinfo *drvinfo)
 392 {
 393         strlcpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver));
 394         strlcpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version));
 395 }
 396
 397 static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev)
 398 {
 399         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 400
 401         return ipvlan->msg_enable;
 402 }
 403
 404 static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value)
 405 {
 406         struct ipvl_dev *ipvlan = netdev_priv(dev);
 407
 408         ipvlan->msg_enable = value;
 409 }
 410
 411 static const struct ethtool_ops ipvlan_ethtool_ops = {
 412         .get_link       = ethtool_op_get_link,
 413         .get_link_ksettings     = ipvlan_ethtool_get_link_ksettings,
 414         .get_drvinfo    = ipvlan_ethtool_get_drvinfo,
 415         .get_msglevel   = ipvlan_ethtool_get_msglevel,
 416         .set_msglevel   = ipvlan_ethtool_set_msglevel,
 417 };
 418
 419 static int ipvlan_nl_changelink(struct net_device *dev,
 420                                 struct nlattr *tb[], struct nlattr *data[],
 421                                 struct netlink_ext_ack *extack)
 422 {
 423         struct ipvl_dev *ipvlan = netdev_priv(dev);
 424         struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
 425         int err = 0;
 426
 427         if (!data)
 428                 return 0;
 429         if (!ns_capable(dev_net(ipvlan->phy_dev)->user_ns, CAP_NET_ADMIN))
 430                 return -EPERM;
 431
 432         if (data[IFLA_IPVLAN_MODE]) {
 433                 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
 434
 435                 err = ipvlan_set_port_mode(port, nmode, extack);
 436         }
 437
 438         if (!err && data[IFLA_IPVLAN_FLAGS]) {
 439                 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
 440
 441                 if (flags & IPVLAN_F_PRIVATE)
 442                         ipvlan_mark_private(port);
 443                 else
 444                         ipvlan_clear_private(port);
 445
 446                 if (flags & IPVLAN_F_VEPA)
 447                         ipvlan_mark_vepa(port);
 448                 else
 449                         ipvlan_clear_vepa(port);
 450         }
 451
 452         return err;
 453 }
 454
 455 static size_t ipvlan_nl_getsize(const struct net_device *dev)
 456 {
 457         return (0
 458                 + nla_total_size(2) /* IFLA_IPVLAN_MODE */
 459                 + nla_total_size(2) /* IFLA_IPVLAN_FLAGS */
 460                 );
 461 }
 462
 463 static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[],
 464                               struct netlink_ext_ack *extack)
 465 {
 466         if (!data)
 467                 return 0;
 468
 469         if (data[IFLA_IPVLAN_MODE]) {
 470                 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
 471
 472                 if (mode >= IPVLAN_MODE_MAX)
 473                         return -EINVAL;
 474         }
 475         if (data[IFLA_IPVLAN_FLAGS]) {
 476                 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
 477
 478                 /* Only two bits are used at this moment. */
 479                 if (flags & ~(IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
 480                         return -EINVAL;
 481                 /* Also both flags can't be active at the same time. */
 482                 if ((flags & (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) ==
 483                     (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
 484                         return -EINVAL;
 485         }
 486
 487         return 0;
 488 }
 489
 490 static int ipvlan_nl_fillinfo(struct sk_buff *skb,
 491                               const struct net_device *dev)
 492 {
 493         struct ipvl_dev *ipvlan = netdev_priv(dev);
 494         struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
 495         int ret = -EINVAL;
 496
 497         if (!port)
 498                 goto err;
 499
 500         ret = -EMSGSIZE;
 501         if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode))
 502                 goto err;
 503         if (nla_put_u16(skb, IFLA_IPVLAN_FLAGS, port->flags))
 504                 goto err;
 505
 506         return 0;
 507
 508 err:
 509         return ret;
 510 }
 511
 512 int ipvlan_link_new(struct net *src_net, struct net_device *dev,
 513                     struct nlattr *tb[], struct nlattr *data[],
 514                     struct netlink_ext_ack *extack)
 515 {
 516         struct ipvl_dev *ipvlan = netdev_priv(dev);
 517         struct ipvl_port *port;
 518         struct net_device *phy_dev;
 519         int err;
 520         u16 mode = IPVLAN_MODE_L3;
 521
 522         if (!tb[IFLA_LINK])
 523                 return -EINVAL;
 524
 525         phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
 526         if (!phy_dev)
 527                 return -ENODEV;
 528
 529         if (netif_is_ipvlan(phy_dev)) {
 530                 struct ipvl_dev *tmp = netdev_priv(phy_dev);
 531
 532                 phy_dev = tmp->phy_dev;
 533                 if (!ns_capable(dev_net(phy_dev)->user_ns, CAP_NET_ADMIN))
 534                         return -EPERM;
 535         } else if (!netif_is_ipvlan_port(phy_dev)) {
 536                 /* Exit early if the underlying link is invalid or busy */
 537                 if (phy_dev->type != ARPHRD_ETHER ||
 538                     phy_dev->flags & IFF_LOOPBACK) {
 539                         netdev_err(phy_dev,
 540                                    "Master is either lo or non-ether device\n");
 541                         return -EINVAL;
 542                 }
 543
 544                 if (netdev_is_rx_handler_busy(phy_dev)) {
 545                         netdev_err(phy_dev, "Device is already in use.\n");
 546                         return -EBUSY;
 547                 }
 548         }
 549
 550         ipvlan->phy_dev = phy_dev;
 551         ipvlan->dev = dev;
 552         ipvlan->sfeatures = IPVLAN_FEATURES;
 553         if (!tb[IFLA_MTU])
 554                 ipvlan_adjust_mtu(ipvlan, phy_dev);
 555         INIT_LIST_HEAD(&ipvlan->addrs);
 556         spin_lock_init(&ipvlan->addrs_lock);
 557
 558         /* TODO Probably put random address here to be presented to the
 559          * world but keep using the physical-dev address for the outgoing
 560          * packets.
 561          */
 562         memcpy(dev->dev_addr, phy_dev->dev_addr, ETH_ALEN);
 563
 564         dev->priv_flags |= IFF_NO_RX_HANDLER;
 565
 566         err = register_netdevice(dev);
 567         if (err < 0)
 568                 return err;
 569
 570         /* ipvlan_init() would have created the port, if required */
 571         port = ipvlan_port_get_rtnl(phy_dev);
 572         ipvlan->port = port;
 573
 574         /* If the port-id base is at the MAX value, then wrap it around and
 575          * begin from 0x1 again. This may be due to a busy system where lots
 576          * of slaves are getting created and deleted.
 577          */
 578         if (port->dev_id_start == 0xFFFE)
 579                 port->dev_id_start = 0x1;
 580
 581         /* Since L2 address is shared among all IPvlan slaves including
 582          * master, use unique 16 bit dev-ids to diffentiate among them.
 583          * Assign IDs between 0x1 and 0xFFFE (used by the master) to each
 584          * slave link [see addrconf_ifid_eui48()].
 585          */
 586         err = ida_simple_get(&port->ida, port->dev_id_start, 0xFFFE,
 587                              GFP_KERNEL);
 588         if (err < 0)
 589                 err = ida_simple_get(&port->ida, 0x1, port->dev_id_start,
 590                                      GFP_KERNEL);
 591         if (err < 0)
 592                 goto unregister_netdev;
 593         dev->dev_id = err;
 594
 595         /* Increment id-base to the next slot for the future assignment */
 596         port->dev_id_start = err + 1;
 597
 598         err = netdev_upper_dev_link(phy_dev, dev, extack);
 599         if (err)
 600                 goto remove_ida;
 601
 602         /* Flags are per port and latest update overrides. User has
 603          * to be consistent in setting it just like the mode attribute.
 604          */
 605         if (data && data[IFLA_IPVLAN_FLAGS])
 606                 port->flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
 607
 608         if (data && data[IFLA_IPVLAN_MODE])
 609                 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
 610
 611         err = ipvlan_set_port_mode(port, mode, extack);
 612         if (err)
 613                 goto unlink_netdev;
 614
 615         list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans);
 616         netif_stacked_transfer_operstate(phy_dev, dev);
 617         return 0;
 618
 619 unlink_netdev:
 620         netdev_upper_dev_unlink(phy_dev, dev);
 621 remove_ida:
 622         ida_simple_remove(&port->ida, dev->dev_id);
 623 unregister_netdev:
 624         unregister_netdevice(dev);
 625         return err;
 626 }
 627 EXPORT_SYMBOL_GPL(ipvlan_link_new);
 628
 629 void ipvlan_link_delete(struct net_device *dev, struct list_head *head)
 630 {
 631         struct ipvl_dev *ipvlan = netdev_priv(dev);
 632         struct ipvl_addr *addr, *next;
 633
 634         spin_lock_bh(&ipvlan->addrs_lock);
 635         list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) {
 636                 ipvlan_ht_addr_del(addr);
 637                 list_del_rcu(&addr->anode);
 638                 kfree_rcu(addr, rcu);
 639         }
 640         spin_unlock_bh(&ipvlan->addrs_lock);
 641
 642         ida_simple_remove(&ipvlan->port->ida, dev->dev_id);
 643         list_del_rcu(&ipvlan->pnode);
 644         unregister_netdevice_queue(dev, head);
 645         netdev_upper_dev_unlink(ipvlan->phy_dev, dev);
 646 }
 647 EXPORT_SYMBOL_GPL(ipvlan_link_delete);
 648
 649 void ipvlan_link_setup(struct net_device *dev)
 650 {
 651         ether_setup(dev);
 652
 653         dev->max_mtu = ETH_MAX_MTU;
 654         dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
 655         dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE;
 656         dev->netdev_ops = &ipvlan_netdev_ops;
 657         dev->needs_free_netdev = true;
 658         dev->header_ops = &ipvlan_header_ops;
 659         dev->ethtool_ops = &ipvlan_ethtool_ops;
 660 }
 661 EXPORT_SYMBOL_GPL(ipvlan_link_setup);
 662
 663 static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] =
 664 {
 665         [IFLA_IPVLAN_MODE] = { .type = NLA_U16 },
 666         [IFLA_IPVLAN_FLAGS] = { .type = NLA_U16 },
 667 };
 668
 669 static struct rtnl_link_ops ipvlan_link_ops = {
 670         .kind           = "ipvlan",
 671         .priv_size      = sizeof(struct ipvl_dev),
 672
 673         .setup          = ipvlan_link_setup,
 674         .newlink        = ipvlan_link_new,
 675         .dellink        = ipvlan_link_delete,
 676 };
 677
 678 int ipvlan_link_register(struct rtnl_link_ops *ops)
 679 {
 680         ops->get_size   = ipvlan_nl_getsize;
 681         ops->policy     = ipvlan_nl_policy;
 682         ops->validate   = ipvlan_nl_validate;
 683         ops->fill_info  = ipvlan_nl_fillinfo;
 684         ops->changelink = ipvlan_nl_changelink;
 685         ops->maxtype    = IFLA_IPVLAN_MAX;
 686         return rtnl_link_register(ops);
 687 }
 688 EXPORT_SYMBOL_GPL(ipvlan_link_register);
 689
 690 static int ipvlan_device_event(struct notifier_block *unused,
 691                                unsigned long event, void *ptr)
 692 {
 693         struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr);
 694         struct netdev_notifier_pre_changeaddr_info *prechaddr_info;
 695         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 696         struct ipvl_dev *ipvlan, *next;
 697         struct ipvl_port *port;
 698         LIST_HEAD(lst_kill);
 699         int err;
 700
 701         if (!netif_is_ipvlan_port(dev))
 702                 return NOTIFY_DONE;
 703
 704         port = ipvlan_port_get_rtnl(dev);
 705
 706         switch (event) {
 707         case NETDEV_CHANGE:
 708                 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
 709                         netif_stacked_transfer_operstate(ipvlan->phy_dev,
 710                                                          ipvlan->dev);
 711                 break;
 712
 713         case NETDEV_REGISTER: {
 714                 struct net *oldnet, *newnet = dev_net(dev);
 715
 716                 oldnet = read_pnet(&port->pnet);
 717                 if (net_eq(newnet, oldnet))
 718                         break;
 719
 720                 write_pnet(&port->pnet, newnet);
 721
 722                 ipvlan_migrate_l3s_hook(oldnet, newnet);
 723                 break;
 724         }
 725         case NETDEV_UNREGISTER:
 726                 if (dev->reg_state != NETREG_UNREGISTERING)
 727                         break;
 728
 729                 list_for_each_entry_safe(ipvlan, next, &port->ipvlans, pnode)
 730                         ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev,
 731                                                             &lst_kill);
 732                 unregister_netdevice_many(&lst_kill);
 733                 break;
 734
 735         case NETDEV_FEAT_CHANGE:
 736                 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
 737                         ipvlan->dev->features = dev->features & IPVLAN_FEATURES;
 738                         ipvlan->dev->gso_max_size = dev->gso_max_size;
 739                         ipvlan->dev->gso_max_segs = dev->gso_max_segs;
 740                         netdev_features_change(ipvlan->dev);
 741                 }
 742                 break;
 743
 744         case NETDEV_CHANGEMTU:
 745                 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
 746                         ipvlan_adjust_mtu(ipvlan, dev);
 747                 break;
 748
 749         case NETDEV_PRE_CHANGEADDR:
 750                 prechaddr_info = ptr;
 751                 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
 752                         err = dev_pre_changeaddr_notify(ipvlan->dev,
 753                                                     prechaddr_info->dev_addr,
 754                                                     extack);
 755                         if (err)
 756                                 return notifier_from_errno(err);
 757                 }
 758                 break;
 759
 760         case NETDEV_CHANGEADDR:
 761                 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
 762                         ether_addr_copy(ipvlan->dev->dev_addr, dev->dev_addr);
 763                         call_netdevice_notifiers(NETDEV_CHANGEADDR, ipvlan->dev);
 764                 }
 765                 break;
 766
 767         case NETDEV_PRE_TYPE_CHANGE:
 768                 /* Forbid underlying device to change its type. */
 769                 return NOTIFY_BAD;
 770         }
 771         return NOTIFY_DONE;
 772 }
 773
 774 /* the caller must held the addrs lock */
 775 static int ipvlan_add_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
 776 {
 777         struct ipvl_addr *addr;
 778
 779         addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC);
 780         if (!addr)
 781                 return -ENOMEM;
 782
 783         addr->master = ipvlan;
 784         if (!is_v6) {
 785                 memcpy(&addr->ip4addr, iaddr, sizeof(struct in_addr));
 786                 addr->atype = IPVL_IPV4;
 787 #if IS_ENABLED(CONFIG_IPV6)
 788         } else {
 789                 memcpy(&addr->ip6addr, iaddr, sizeof(struct in6_addr));
 790                 addr->atype = IPVL_IPV6;
 791 #endif
 792         }
 793
 794         list_add_tail_rcu(&addr->anode, &ipvlan->addrs);
 795
 796         /* If the interface is not up, the address will be added to the hash
 797          * list by ipvlan_open.
 798          */
 799         if (netif_running(ipvlan->dev))
 800                 ipvlan_ht_addr_add(ipvlan, addr);
 801
 802         return 0;
 803 }
 804
 805 static void ipvlan_del_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
 806 {
 807         struct ipvl_addr *addr;
 808
 809         spin_lock_bh(&ipvlan->addrs_lock);
 810         addr = ipvlan_find_addr(ipvlan, iaddr, is_v6);
 811         if (!addr) {
 812                 spin_unlock_bh(&ipvlan->addrs_lock);
 813                 return;
 814         }
 815
 816         ipvlan_ht_addr_del(addr);
 817         list_del_rcu(&addr->anode);
 818         spin_unlock_bh(&ipvlan->addrs_lock);
 819         kfree_rcu(addr, rcu);
 820 }
 821
 822 static bool ipvlan_is_valid_dev(const struct net_device *dev)
 823 {
 824         struct ipvl_dev *ipvlan = netdev_priv(dev);
 825
 826         if (!netif_is_ipvlan(dev))
 827                 return false;
 828
 829         if (!ipvlan || !ipvlan->port)
 830                 return false;
 831
 832         return true;
 833 }
 834
 835 #if IS_ENABLED(CONFIG_IPV6)
 836 static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
 837 {
 838         int ret = -EINVAL;
 839
 840         spin_lock_bh(&ipvlan->addrs_lock);
 841         if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true))
 842                 netif_err(ipvlan, ifup, ipvlan->dev,
 843                           "Failed to add IPv6=%pI6c addr for %s intf\n",
 844                           ip6_addr, ipvlan->dev->name);
 845         else
 846                 ret = ipvlan_add_addr(ipvlan, ip6_addr, true);
 847         spin_unlock_bh(&ipvlan->addrs_lock);
 848         return ret;
 849 }
 850
 851 static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
 852 {
 853         return ipvlan_del_addr(ipvlan, ip6_addr, true);
 854 }
 855
 856 static int ipvlan_addr6_event(struct notifier_block *unused,
 857                               unsigned long event, void *ptr)
 858 {
 859         struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr;
 860         struct net_device *dev = (struct net_device *)if6->idev->dev;
 861         struct ipvl_dev *ipvlan = netdev_priv(dev);
 862
 863         if (!ipvlan_is_valid_dev(dev))
 864                 return NOTIFY_DONE;
 865
 866         switch (event) {
 867         case NETDEV_UP:
 868                 if (ipvlan_add_addr6(ipvlan, &if6->addr))
 869                         return NOTIFY_BAD;
 870                 break;
 871
 872         case NETDEV_DOWN:
 873                 ipvlan_del_addr6(ipvlan, &if6->addr);
 874                 break;
 875         }
 876
 877         return NOTIFY_OK;
 878 }
 879
 880 static int ipvlan_addr6_validator_event(struct notifier_block *unused,
 881                                         unsigned long event, void *ptr)
 882 {
 883         struct in6_validator_info *i6vi = (struct in6_validator_info *)ptr;
 884         struct net_device *dev = (struct net_device *)i6vi->i6vi_dev->dev;
 885         struct ipvl_dev *ipvlan = netdev_priv(dev);
 886
 887         if (!ipvlan_is_valid_dev(dev))
 888                 return NOTIFY_DONE;
 889
 890         switch (event) {
 891         case NETDEV_UP:
 892                 if (ipvlan_addr_busy(ipvlan->port, &i6vi->i6vi_addr, true)) {
 893                         NL_SET_ERR_MSG(i6vi->extack,
 894                                        "Address already assigned to an ipvlan device");
 895                         return notifier_from_errno(-EADDRINUSE);
 896                 }
 897                 break;
 898         }
 899
 900         return NOTIFY_OK;
 901 }
 902 #endif
 903
 904 static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
 905 {
 906         int ret = -EINVAL;
 907
 908         spin_lock_bh(&ipvlan->addrs_lock);
 909         if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false))
 910                 netif_err(ipvlan, ifup, ipvlan->dev,
 911                           "Failed to add IPv4=%pI4 on %s intf.\n",
 912                           ip4_addr, ipvlan->dev->name);
 913         else
 914                 ret = ipvlan_add_addr(ipvlan, ip4_addr, false);
 915         spin_unlock_bh(&ipvlan->addrs_lock);
 916         return ret;
 917 }
 918
 919 static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
 920 {
 921         return ipvlan_del_addr(ipvlan, ip4_addr, false);
 922 }
 923
 924 static int ipvlan_addr4_event(struct notifier_block *unused,
 925                               unsigned long event, void *ptr)
 926 {
 927         struct in_ifaddr *if4 = (struct in_ifaddr *)ptr;
 928         struct net_device *dev = (struct net_device *)if4->ifa_dev->dev;
 929         struct ipvl_dev *ipvlan = netdev_priv(dev);
 930         struct in_addr ip4_addr;
 931
 932         if (!ipvlan_is_valid_dev(dev))
 933                 return NOTIFY_DONE;
 934
 935         switch (event) {
 936         case NETDEV_UP:
 937                 ip4_addr.s_addr = if4->ifa_address;
 938                 if (ipvlan_add_addr4(ipvlan, &ip4_addr))
 939                         return NOTIFY_BAD;
 940                 break;
 941
 942         case NETDEV_DOWN:
 943                 ip4_addr.s_addr = if4->ifa_address;
 944                 ipvlan_del_addr4(ipvlan, &ip4_addr);
 945                 break;
 946         }
 947
 948         return NOTIFY_OK;
 949 }
 950
 951 static int ipvlan_addr4_validator_event(struct notifier_block *unused,
 952                                         unsigned long event, void *ptr)
 953 {
 954         struct in_validator_info *ivi = (struct in_validator_info *)ptr;
 955         struct net_device *dev = (struct net_device *)ivi->ivi_dev->dev;
 956         struct ipvl_dev *ipvlan = netdev_priv(dev);
 957
 958         if (!ipvlan_is_valid_dev(dev))
 959                 return NOTIFY_DONE;
 960
 961         switch (event) {
 962         case NETDEV_UP:
 963                 if (ipvlan_addr_busy(ipvlan->port, &ivi->ivi_addr, false)) {
 964                         NL_SET_ERR_MSG(ivi->extack,
 965                                        "Address already assigned to an ipvlan device");
 966                         return notifier_from_errno(-EADDRINUSE);
 967                 }
 968                 break;
 969         }
 970
 971         return NOTIFY_OK;
 972 }
 973
 974 static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = {
 975         .notifier_call = ipvlan_addr4_event,
 976 };
 977
 978 static struct notifier_block ipvlan_addr4_vtor_notifier_block __read_mostly = {
 979         .notifier_call = ipvlan_addr4_validator_event,
 980 };
 981
 982 static struct notifier_block ipvlan_notifier_block __read_mostly = {
 983         .notifier_call = ipvlan_device_event,
 984 };
 985
 986 #if IS_ENABLED(CONFIG_IPV6)
 987 static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = {
 988         .notifier_call = ipvlan_addr6_event,
 989 };
 990
 991 static struct notifier_block ipvlan_addr6_vtor_notifier_block __read_mostly = {
 992         .notifier_call = ipvlan_addr6_validator_event,
 993 };
 994 #endif
 995
 996 static int __init ipvlan_init_module(void)
 997 {
 998         int err;
 999
1000         ipvlan_init_secret();
1001         register_netdevice_notifier(&ipvlan_notifier_block);
1002 #if IS_ENABLED(CONFIG_IPV6)
1003         register_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1004         register_inet6addr_validator_notifier(
1005             &ipvlan_addr6_vtor_notifier_block);
1006 #endif
1007         register_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1008         register_inetaddr_validator_notifier(&ipvlan_addr4_vtor_notifier_block);
1009
1010         err = ipvlan_l3s_init();
1011         if (err < 0)
1012                 goto error;
1013
1014         err = ipvlan_link_register(&ipvlan_link_ops);
1015         if (err < 0) {
1016                 ipvlan_l3s_cleanup();
1017                 goto error;
1018         }
1019
1020         return 0;
1021 error:
1022         unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1023         unregister_inetaddr_validator_notifier(
1024             &ipvlan_addr4_vtor_notifier_block);
1025 #if IS_ENABLED(CONFIG_IPV6)
1026         unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1027         unregister_inet6addr_validator_notifier(
1028             &ipvlan_addr6_vtor_notifier_block);
1029 #endif
1030         unregister_netdevice_notifier(&ipvlan_notifier_block);
1031         return err;
1032 }
1033
1034 static void __exit ipvlan_cleanup_module(void)
1035 {
1036         rtnl_link_unregister(&ipvlan_link_ops);
1037         ipvlan_l3s_cleanup();
1038         unregister_netdevice_notifier(&ipvlan_notifier_block);
1039         unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1040         unregister_inetaddr_validator_notifier(
1041             &ipvlan_addr4_vtor_notifier_block);
1042 #if IS_ENABLED(CONFIG_IPV6)
1043         unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1044         unregister_inet6addr_validator_notifier(
1045             &ipvlan_addr6_vtor_notifier_block);
1046 #endif
1047 }
1048
1049 module_init(ipvlan_init_module);
1050 module_exit(ipvlan_cleanup_module);
1051
1052 MODULE_LICENSE("GPL");
1053 MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>");
1054 MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs");
1055 MODULE_ALIAS_RTNL_LINK("ipvlan");