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_ALWAYS_ON_OFLOADS \
 110         (NETIF_F_SG | NETIF_F_HW_CSUM | \
 111          NETIF_F_GSO_ROBUST | NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL)
 112
 113 #define IPVLAN_ALWAYS_ON \
 114         (IPVLAN_ALWAYS_ON_OFLOADS | NETIF_F_LLTX | NETIF_F_VLAN_CHALLENGED)
 115
 116 #define IPVLAN_FEATURES \
 117         (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
 118          NETIF_F_GSO | NETIF_F_ALL_TSO | NETIF_F_GSO_ROBUST | \
 119          NETIF_F_GRO | NETIF_F_RXCSUM | \
 120          NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
 121
 122         /* NETIF_F_GSO_ENCAP_ALL NETIF_F_GSO_SOFTWARE Newly added */
 123
 124 #define IPVLAN_STATE_MASK \
 125         ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
 126
 127 static int ipvlan_init(struct net_device *dev)
 128 {
 129         struct ipvl_dev *ipvlan = netdev_priv(dev);
 130         struct net_device *phy_dev = ipvlan->phy_dev;
 131         struct ipvl_port *port;
 132         int err;
 133
 134         dev->state = (dev->state & ~IPVLAN_STATE_MASK) |
 135                      (phy_dev->state & IPVLAN_STATE_MASK);
 136         dev->features = phy_dev->features & IPVLAN_FEATURES;
 137         dev->features |= IPVLAN_ALWAYS_ON;
 138         dev->vlan_features = phy_dev->vlan_features & IPVLAN_FEATURES;
 139         dev->vlan_features |= IPVLAN_ALWAYS_ON_OFLOADS;
 140         dev->hw_enc_features |= dev->features;
 141         dev->gso_max_size = phy_dev->gso_max_size;
 142         dev->gso_max_segs = phy_dev->gso_max_segs;
 143         dev->hard_header_len = phy_dev->hard_header_len;
 144
 145         netdev_lockdep_set_classes(dev);
 146
 147         ipvlan->pcpu_stats = netdev_alloc_pcpu_stats(struct ipvl_pcpu_stats);
 148         if (!ipvlan->pcpu_stats)
 149                 return -ENOMEM;
 150
 151         if (!netif_is_ipvlan_port(phy_dev)) {
 152                 err = ipvlan_port_create(phy_dev);
 153                 if (err < 0) {
 154                         free_percpu(ipvlan->pcpu_stats);
 155                         return err;
 156                 }
 157         }
 158         port = ipvlan_port_get_rtnl(phy_dev);
 159         port->count += 1;
 160         return 0;
 161 }
 162
 163 static void ipvlan_uninit(struct net_device *dev)
 164 {
 165         struct ipvl_dev *ipvlan = netdev_priv(dev);
 166         struct net_device *phy_dev = ipvlan->phy_dev;
 167         struct ipvl_port *port;
 168
 169         free_percpu(ipvlan->pcpu_stats);
 170
 171         port = ipvlan_port_get_rtnl(phy_dev);
 172         port->count -= 1;
 173         if (!port->count)
 174                 ipvlan_port_destroy(port->dev);
 175 }
 176
 177 static int ipvlan_open(struct net_device *dev)
 178 {
 179         struct ipvl_dev *ipvlan = netdev_priv(dev);
 180         struct ipvl_addr *addr;
 181
 182         if (ipvlan->port->mode == IPVLAN_MODE_L3 ||
 183             ipvlan->port->mode == IPVLAN_MODE_L3S)
 184                 dev->flags |= IFF_NOARP;
 185         else
 186                 dev->flags &= ~IFF_NOARP;
 187
 188         rcu_read_lock();
 189         list_for_each_entry_rcu(addr, &ipvlan->addrs, anode)
 190                 ipvlan_ht_addr_add(ipvlan, addr);
 191         rcu_read_unlock();
 192
 193         return 0;
 194 }
 195
 196 static int ipvlan_stop(struct net_device *dev)
 197 {
 198         struct ipvl_dev *ipvlan = netdev_priv(dev);
 199         struct net_device *phy_dev = ipvlan->phy_dev;
 200         struct ipvl_addr *addr;
 201
 202         dev_uc_unsync(phy_dev, dev);
 203         dev_mc_unsync(phy_dev, dev);
 204
 205         rcu_read_lock();
 206         list_for_each_entry_rcu(addr, &ipvlan->addrs, anode)
 207                 ipvlan_ht_addr_del(addr);
 208         rcu_read_unlock();
 209
 210         return 0;
 211 }
 212
 213 static netdev_tx_t ipvlan_start_xmit(struct sk_buff *skb,
 214                                      struct net_device *dev)
 215 {
 216         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 217         int skblen = skb->len;
 218         int ret;
 219
 220         ret = ipvlan_queue_xmit(skb, dev);
 221         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 222                 struct ipvl_pcpu_stats *pcptr;
 223
 224                 pcptr = this_cpu_ptr(ipvlan->pcpu_stats);
 225
 226                 u64_stats_update_begin(&pcptr->syncp);
 227                 pcptr->tx_pkts++;
 228                 pcptr->tx_bytes += skblen;
 229                 u64_stats_update_end(&pcptr->syncp);
 230         } else {
 231                 this_cpu_inc(ipvlan->pcpu_stats->tx_drps);
 232         }
 233         return ret;
 234 }
 235
 236 static netdev_features_t ipvlan_fix_features(struct net_device *dev,
 237                                              netdev_features_t features)
 238 {
 239         struct ipvl_dev *ipvlan = netdev_priv(dev);
 240
 241         features |= NETIF_F_ALL_FOR_ALL;
 242         features &= (ipvlan->sfeatures | ~IPVLAN_FEATURES);
 243         features = netdev_increment_features(ipvlan->phy_dev->features,
 244                                              features, features);
 245         features |= IPVLAN_ALWAYS_ON;
 246         features &= (IPVLAN_FEATURES | IPVLAN_ALWAYS_ON);
 247
 248         return features;
 249 }
 250
 251 static void ipvlan_change_rx_flags(struct net_device *dev, int change)
 252 {
 253         struct ipvl_dev *ipvlan = netdev_priv(dev);
 254         struct net_device *phy_dev = ipvlan->phy_dev;
 255
 256         if (change & IFF_ALLMULTI)
 257                 dev_set_allmulti(phy_dev, dev->flags & IFF_ALLMULTI? 1 : -1);
 258 }
 259
 260 static void ipvlan_set_multicast_mac_filter(struct net_device *dev)
 261 {
 262         struct ipvl_dev *ipvlan = netdev_priv(dev);
 263
 264         if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
 265                 bitmap_fill(ipvlan->mac_filters, IPVLAN_MAC_FILTER_SIZE);
 266         } else {
 267                 struct netdev_hw_addr *ha;
 268                 DECLARE_BITMAP(mc_filters, IPVLAN_MAC_FILTER_SIZE);
 269
 270                 bitmap_zero(mc_filters, IPVLAN_MAC_FILTER_SIZE);
 271                 netdev_for_each_mc_addr(ha, dev)
 272                         __set_bit(ipvlan_mac_hash(ha->addr), mc_filters);
 273
 274                 /* Turn-on broadcast bit irrespective of address family,
 275                  * since broadcast is deferred to a work-queue, hence no
 276                  * impact on fast-path processing.
 277                  */
 278                 __set_bit(ipvlan_mac_hash(dev->broadcast), mc_filters);
 279
 280                 bitmap_copy(ipvlan->mac_filters, mc_filters,
 281                             IPVLAN_MAC_FILTER_SIZE);
 282         }
 283         dev_uc_sync(ipvlan->phy_dev, dev);
 284         dev_mc_sync(ipvlan->phy_dev, dev);
 285 }
 286
 287 static void ipvlan_get_stats64(struct net_device *dev,
 288                                struct rtnl_link_stats64 *s)
 289 {
 290         struct ipvl_dev *ipvlan = netdev_priv(dev);
 291
 292         if (ipvlan->pcpu_stats) {
 293                 struct ipvl_pcpu_stats *pcptr;
 294                 u64 rx_pkts, rx_bytes, rx_mcast, tx_pkts, tx_bytes;
 295                 u32 rx_errs = 0, tx_drps = 0;
 296                 u32 strt;
 297                 int idx;
 298
 299                 for_each_possible_cpu(idx) {
 300                         pcptr = per_cpu_ptr(ipvlan->pcpu_stats, idx);
 301                         do {
 302                                 strt= u64_stats_fetch_begin_irq(&pcptr->syncp);
 303                                 rx_pkts = pcptr->rx_pkts;
 304                                 rx_bytes = pcptr->rx_bytes;
 305                                 rx_mcast = pcptr->rx_mcast;
 306                                 tx_pkts = pcptr->tx_pkts;
 307                                 tx_bytes = pcptr->tx_bytes;
 308                         } while (u64_stats_fetch_retry_irq(&pcptr->syncp,
 309                                                            strt));
 310
 311                         s->rx_packets += rx_pkts;
 312                         s->rx_bytes += rx_bytes;
 313                         s->multicast += rx_mcast;
 314                         s->tx_packets += tx_pkts;
 315                         s->tx_bytes += tx_bytes;
 316
 317                         /* u32 values are updated without syncp protection. */
 318                         rx_errs += pcptr->rx_errs;
 319                         tx_drps += pcptr->tx_drps;
 320                 }
 321                 s->rx_errors = rx_errs;
 322                 s->rx_dropped = rx_errs;
 323                 s->tx_dropped = tx_drps;
 324         }
 325 }
 326
 327 static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid)
 328 {
 329         struct ipvl_dev *ipvlan = netdev_priv(dev);
 330         struct net_device *phy_dev = ipvlan->phy_dev;
 331
 332         return vlan_vid_add(phy_dev, proto, vid);
 333 }
 334
 335 static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
 336                                    u16 vid)
 337 {
 338         struct ipvl_dev *ipvlan = netdev_priv(dev);
 339         struct net_device *phy_dev = ipvlan->phy_dev;
 340
 341         vlan_vid_del(phy_dev, proto, vid);
 342         return 0;
 343 }
 344
 345 static int ipvlan_get_iflink(const struct net_device *dev)
 346 {
 347         struct ipvl_dev *ipvlan = netdev_priv(dev);
 348
 349         return ipvlan->phy_dev->ifindex;
 350 }
 351
 352 static const struct net_device_ops ipvlan_netdev_ops = {
 353         .ndo_init               = ipvlan_init,
 354         .ndo_uninit             = ipvlan_uninit,
 355         .ndo_open               = ipvlan_open,
 356         .ndo_stop               = ipvlan_stop,
 357         .ndo_start_xmit         = ipvlan_start_xmit,
 358         .ndo_fix_features       = ipvlan_fix_features,
 359         .ndo_change_rx_flags    = ipvlan_change_rx_flags,
 360         .ndo_set_rx_mode        = ipvlan_set_multicast_mac_filter,
 361         .ndo_get_stats64        = ipvlan_get_stats64,
 362         .ndo_vlan_rx_add_vid    = ipvlan_vlan_rx_add_vid,
 363         .ndo_vlan_rx_kill_vid   = ipvlan_vlan_rx_kill_vid,
 364         .ndo_get_iflink         = ipvlan_get_iflink,
 365 };
 366
 367 static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
 368                               unsigned short type, const void *daddr,
 369                               const void *saddr, unsigned len)
 370 {
 371         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 372         struct net_device *phy_dev = ipvlan->phy_dev;
 373
 374         /* TODO Probably use a different field than dev_addr so that the
 375          * mac-address on the virtual device is portable and can be carried
 376          * while the packets use the mac-addr on the physical device.
 377          */
 378         return dev_hard_header(skb, phy_dev, type, daddr,
 379                                saddr ? : phy_dev->dev_addr, len);
 380 }
 381
 382 static const struct header_ops ipvlan_header_ops = {
 383         .create         = ipvlan_hard_header,
 384         .parse          = eth_header_parse,
 385         .cache          = eth_header_cache,
 386         .cache_update   = eth_header_cache_update,
 387 };
 388
 389 static void ipvlan_adjust_mtu(struct ipvl_dev *ipvlan, struct net_device *dev)
 390 {
 391         ipvlan->dev->mtu = dev->mtu;
 392 }
 393
 394 static bool netif_is_ipvlan(const struct net_device *dev)
 395 {
 396         /* both ipvlan and ipvtap devices use the same netdev_ops */
 397         return dev->netdev_ops == &ipvlan_netdev_ops;
 398 }
 399
 400 static int ipvlan_ethtool_get_link_ksettings(struct net_device *dev,
 401                                              struct ethtool_link_ksettings *cmd)
 402 {
 403         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 404
 405         return __ethtool_get_link_ksettings(ipvlan->phy_dev, cmd);
 406 }
 407
 408 static void ipvlan_ethtool_get_drvinfo(struct net_device *dev,
 409                                        struct ethtool_drvinfo *drvinfo)
 410 {
 411         strlcpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver));
 412         strlcpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version));
 413 }
 414
 415 static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev)
 416 {
 417         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 418
 419         return ipvlan->msg_enable;
 420 }
 421
 422 static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value)
 423 {
 424         struct ipvl_dev *ipvlan = netdev_priv(dev);
 425
 426         ipvlan->msg_enable = value;
 427 }
 428
 429 static const struct ethtool_ops ipvlan_ethtool_ops = {
 430         .get_link       = ethtool_op_get_link,
 431         .get_link_ksettings     = ipvlan_ethtool_get_link_ksettings,
 432         .get_drvinfo    = ipvlan_ethtool_get_drvinfo,
 433         .get_msglevel   = ipvlan_ethtool_get_msglevel,
 434         .set_msglevel   = ipvlan_ethtool_set_msglevel,
 435 };
 436
 437 static int ipvlan_nl_changelink(struct net_device *dev,
 438                                 struct nlattr *tb[], struct nlattr *data[],
 439                                 struct netlink_ext_ack *extack)
 440 {
 441         struct ipvl_dev *ipvlan = netdev_priv(dev);
 442         struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
 443         int err = 0;
 444
 445         if (!data)
 446                 return 0;
 447         if (!ns_capable(dev_net(ipvlan->phy_dev)->user_ns, CAP_NET_ADMIN))
 448                 return -EPERM;
 449
 450         if (data[IFLA_IPVLAN_MODE]) {
 451                 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
 452
 453                 err = ipvlan_set_port_mode(port, nmode, extack);
 454         }
 455
 456         if (!err && data[IFLA_IPVLAN_FLAGS]) {
 457                 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
 458
 459                 if (flags & IPVLAN_F_PRIVATE)
 460                         ipvlan_mark_private(port);
 461                 else
 462                         ipvlan_clear_private(port);
 463
 464                 if (flags & IPVLAN_F_VEPA)
 465                         ipvlan_mark_vepa(port);
 466                 else
 467                         ipvlan_clear_vepa(port);
 468         }
 469
 470         return err;
 471 }
 472
 473 static size_t ipvlan_nl_getsize(const struct net_device *dev)
 474 {
 475         return (0
 476                 + nla_total_size(2) /* IFLA_IPVLAN_MODE */
 477                 + nla_total_size(2) /* IFLA_IPVLAN_FLAGS */
 478                 );
 479 }
 480
 481 static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[],
 482                               struct netlink_ext_ack *extack)
 483 {
 484         if (!data)
 485                 return 0;
 486
 487         if (data[IFLA_IPVLAN_MODE]) {
 488                 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
 489
 490                 if (mode >= IPVLAN_MODE_MAX)
 491                         return -EINVAL;
 492         }
 493         if (data[IFLA_IPVLAN_FLAGS]) {
 494                 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
 495
 496                 /* Only two bits are used at this moment. */
 497                 if (flags & ~(IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
 498                         return -EINVAL;
 499                 /* Also both flags can't be active at the same time. */
 500                 if ((flags & (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) ==
 501                     (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
 502                         return -EINVAL;
 503         }
 504
 505         return 0;
 506 }
 507
 508 static int ipvlan_nl_fillinfo(struct sk_buff *skb,
 509                               const struct net_device *dev)
 510 {
 511         struct ipvl_dev *ipvlan = netdev_priv(dev);
 512         struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
 513         int ret = -EINVAL;
 514
 515         if (!port)
 516                 goto err;
 517
 518         ret = -EMSGSIZE;
 519         if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode))
 520                 goto err;
 521         if (nla_put_u16(skb, IFLA_IPVLAN_FLAGS, port->flags))
 522                 goto err;
 523
 524         return 0;
 525
 526 err:
 527         return ret;
 528 }
 529
 530 int ipvlan_link_new(struct net *src_net, struct net_device *dev,
 531                     struct nlattr *tb[], struct nlattr *data[],
 532                     struct netlink_ext_ack *extack)
 533 {
 534         struct ipvl_dev *ipvlan = netdev_priv(dev);
 535         struct ipvl_port *port;
 536         struct net_device *phy_dev;
 537         int err;
 538         u16 mode = IPVLAN_MODE_L3;
 539
 540         if (!tb[IFLA_LINK])
 541                 return -EINVAL;
 542
 543         phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
 544         if (!phy_dev)
 545                 return -ENODEV;
 546
 547         if (netif_is_ipvlan(phy_dev)) {
 548                 struct ipvl_dev *tmp = netdev_priv(phy_dev);
 549
 550                 phy_dev = tmp->phy_dev;
 551                 if (!ns_capable(dev_net(phy_dev)->user_ns, CAP_NET_ADMIN))
 552                         return -EPERM;
 553         } else if (!netif_is_ipvlan_port(phy_dev)) {
 554                 /* Exit early if the underlying link is invalid or busy */
 555                 if (phy_dev->type != ARPHRD_ETHER ||
 556                     phy_dev->flags & IFF_LOOPBACK) {
 557                         netdev_err(phy_dev,
 558                                    "Master is either lo or non-ether device\n");
 559                         return -EINVAL;
 560                 }
 561
 562                 if (netdev_is_rx_handler_busy(phy_dev)) {
 563                         netdev_err(phy_dev, "Device is already in use.\n");
 564                         return -EBUSY;
 565                 }
 566         }
 567
 568         ipvlan->phy_dev = phy_dev;
 569         ipvlan->dev = dev;
 570         ipvlan->sfeatures = IPVLAN_FEATURES;
 571         if (!tb[IFLA_MTU])
 572                 ipvlan_adjust_mtu(ipvlan, phy_dev);
 573         INIT_LIST_HEAD(&ipvlan->addrs);
 574         spin_lock_init(&ipvlan->addrs_lock);
 575
 576         /* TODO Probably put random address here to be presented to the
 577          * world but keep using the physical-dev address for the outgoing
 578          * packets.
 579          */
 580         memcpy(dev->dev_addr, phy_dev->dev_addr, ETH_ALEN);
 581
 582         dev->priv_flags |= IFF_NO_RX_HANDLER;
 583
 584         err = register_netdevice(dev);
 585         if (err < 0)
 586                 return err;
 587
 588         /* ipvlan_init() would have created the port, if required */
 589         port = ipvlan_port_get_rtnl(phy_dev);
 590         ipvlan->port = port;
 591
 592         /* If the port-id base is at the MAX value, then wrap it around and
 593          * begin from 0x1 again. This may be due to a busy system where lots
 594          * of slaves are getting created and deleted.
 595          */
 596         if (port->dev_id_start == 0xFFFE)
 597                 port->dev_id_start = 0x1;
 598
 599         /* Since L2 address is shared among all IPvlan slaves including
 600          * master, use unique 16 bit dev-ids to diffentiate among them.
 601          * Assign IDs between 0x1 and 0xFFFE (used by the master) to each
 602          * slave link [see addrconf_ifid_eui48()].
 603          */
 604         err = ida_simple_get(&port->ida, port->dev_id_start, 0xFFFE,
 605                              GFP_KERNEL);
 606         if (err < 0)
 607                 err = ida_simple_get(&port->ida, 0x1, port->dev_id_start,
 608                                      GFP_KERNEL);
 609         if (err < 0)
 610                 goto unregister_netdev;
 611         dev->dev_id = err;
 612
 613         /* Increment id-base to the next slot for the future assignment */
 614         port->dev_id_start = err + 1;
 615
 616         err = netdev_upper_dev_link(phy_dev, dev, extack);
 617         if (err)
 618                 goto remove_ida;
 619
 620         /* Flags are per port and latest update overrides. User has
 621          * to be consistent in setting it just like the mode attribute.
 622          */
 623         if (data && data[IFLA_IPVLAN_FLAGS])
 624                 port->flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
 625
 626         if (data && data[IFLA_IPVLAN_MODE])
 627                 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
 628
 629         err = ipvlan_set_port_mode(port, mode, extack);
 630         if (err)
 631                 goto unlink_netdev;
 632
 633         list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans);
 634         netif_stacked_transfer_operstate(phy_dev, dev);
 635         return 0;
 636
 637 unlink_netdev:
 638         netdev_upper_dev_unlink(phy_dev, dev);
 639 remove_ida:
 640         ida_simple_remove(&port->ida, dev->dev_id);
 641 unregister_netdev:
 642         unregister_netdevice(dev);
 643         return err;
 644 }
 645 EXPORT_SYMBOL_GPL(ipvlan_link_new);
 646
 647 void ipvlan_link_delete(struct net_device *dev, struct list_head *head)
 648 {
 649         struct ipvl_dev *ipvlan = netdev_priv(dev);
 650         struct ipvl_addr *addr, *next;
 651
 652         spin_lock_bh(&ipvlan->addrs_lock);
 653         list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) {
 654                 ipvlan_ht_addr_del(addr);
 655                 list_del_rcu(&addr->anode);
 656                 kfree_rcu(addr, rcu);
 657         }
 658         spin_unlock_bh(&ipvlan->addrs_lock);
 659
 660         ida_simple_remove(&ipvlan->port->ida, dev->dev_id);
 661         list_del_rcu(&ipvlan->pnode);
 662         unregister_netdevice_queue(dev, head);
 663         netdev_upper_dev_unlink(ipvlan->phy_dev, dev);
 664 }
 665 EXPORT_SYMBOL_GPL(ipvlan_link_delete);
 666
 667 void ipvlan_link_setup(struct net_device *dev)
 668 {
 669         ether_setup(dev);
 670
 671         dev->max_mtu = ETH_MAX_MTU;
 672         dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
 673         dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE;
 674         dev->netdev_ops = &ipvlan_netdev_ops;
 675         dev->needs_free_netdev = true;
 676         dev->header_ops = &ipvlan_header_ops;
 677         dev->ethtool_ops = &ipvlan_ethtool_ops;
 678 }
 679 EXPORT_SYMBOL_GPL(ipvlan_link_setup);
 680
 681 static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] =
 682 {
 683         [IFLA_IPVLAN_MODE] = { .type = NLA_U16 },
 684         [IFLA_IPVLAN_FLAGS] = { .type = NLA_U16 },
 685 };
 686
 687 static struct net *ipvlan_get_link_net(const struct net_device *dev)
 688 {
 689         struct ipvl_dev *ipvlan = netdev_priv(dev);
 690
 691         return dev_net(ipvlan->phy_dev);
 692 }
 693
 694 static struct rtnl_link_ops ipvlan_link_ops = {
 695         .kind           = "ipvlan",
 696         .priv_size      = sizeof(struct ipvl_dev),
 697
 698         .setup          = ipvlan_link_setup,
 699         .newlink        = ipvlan_link_new,
 700         .dellink        = ipvlan_link_delete,
 701         .get_link_net   = ipvlan_get_link_net,
 702 };
 703
 704 int ipvlan_link_register(struct rtnl_link_ops *ops)
 705 {
 706         ops->get_size   = ipvlan_nl_getsize;
 707         ops->policy     = ipvlan_nl_policy;
 708         ops->validate   = ipvlan_nl_validate;
 709         ops->fill_info  = ipvlan_nl_fillinfo;
 710         ops->changelink = ipvlan_nl_changelink;
 711         ops->maxtype    = IFLA_IPVLAN_MAX;
 712         return rtnl_link_register(ops);
 713 }
 714 EXPORT_SYMBOL_GPL(ipvlan_link_register);
 715
 716 static int ipvlan_device_event(struct notifier_block *unused,
 717                                unsigned long event, void *ptr)
 718 {
 719         struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr);
 720         struct netdev_notifier_pre_changeaddr_info *prechaddr_info;
 721         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 722         struct ipvl_dev *ipvlan, *next;
 723         struct ipvl_port *port;
 724         LIST_HEAD(lst_kill);
 725         int err;
 726
 727         if (!netif_is_ipvlan_port(dev))
 728                 return NOTIFY_DONE;
 729
 730         port = ipvlan_port_get_rtnl(dev);
 731
 732         switch (event) {
 733         case NETDEV_CHANGE:
 734                 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
 735                         netif_stacked_transfer_operstate(ipvlan->phy_dev,
 736                                                          ipvlan->dev);
 737                 break;
 738
 739         case NETDEV_REGISTER: {
 740                 struct net *oldnet, *newnet = dev_net(dev);
 741
 742                 oldnet = read_pnet(&port->pnet);
 743                 if (net_eq(newnet, oldnet))
 744                         break;
 745
 746                 write_pnet(&port->pnet, newnet);
 747
 748                 ipvlan_migrate_l3s_hook(oldnet, newnet);
 749                 break;
 750         }
 751         case NETDEV_UNREGISTER:
 752                 if (dev->reg_state != NETREG_UNREGISTERING)
 753                         break;
 754
 755                 list_for_each_entry_safe(ipvlan, next, &port->ipvlans, pnode)
 756                         ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev,
 757                                                             &lst_kill);
 758                 unregister_netdevice_many(&lst_kill);
 759                 break;
 760
 761         case NETDEV_FEAT_CHANGE:
 762                 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
 763                         ipvlan->dev->gso_max_size = dev->gso_max_size;
 764                         ipvlan->dev->gso_max_segs = dev->gso_max_segs;
 765                         netdev_update_features(ipvlan->dev);
 766                 }
 767                 break;
 768
 769         case NETDEV_CHANGEMTU:
 770                 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
 771                         ipvlan_adjust_mtu(ipvlan, dev);
 772                 break;
 773
 774         case NETDEV_PRE_CHANGEADDR:
 775                 prechaddr_info = ptr;
 776                 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
 777                         err = dev_pre_changeaddr_notify(ipvlan->dev,
 778                                                     prechaddr_info->dev_addr,
 779                                                     extack);
 780                         if (err)
 781                                 return notifier_from_errno(err);
 782                 }
 783                 break;
 784
 785         case NETDEV_CHANGEADDR:
 786                 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
 787                         ether_addr_copy(ipvlan->dev->dev_addr, dev->dev_addr);
 788                         call_netdevice_notifiers(NETDEV_CHANGEADDR, ipvlan->dev);
 789                 }
 790                 break;
 791
 792         case NETDEV_PRE_TYPE_CHANGE:
 793                 /* Forbid underlying device to change its type. */
 794                 return NOTIFY_BAD;
 795         }
 796         return NOTIFY_DONE;
 797 }
 798
 799 /* the caller must held the addrs lock */
 800 static int ipvlan_add_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
 801 {
 802         struct ipvl_addr *addr;
 803
 804         addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC);
 805         if (!addr)
 806                 return -ENOMEM;
 807
 808         addr->master = ipvlan;
 809         if (!is_v6) {
 810                 memcpy(&addr->ip4addr, iaddr, sizeof(struct in_addr));
 811                 addr->atype = IPVL_IPV4;
 812 #if IS_ENABLED(CONFIG_IPV6)
 813         } else {
 814                 memcpy(&addr->ip6addr, iaddr, sizeof(struct in6_addr));
 815                 addr->atype = IPVL_IPV6;
 816 #endif
 817         }
 818
 819         list_add_tail_rcu(&addr->anode, &ipvlan->addrs);
 820
 821         /* If the interface is not up, the address will be added to the hash
 822          * list by ipvlan_open.
 823          */
 824         if (netif_running(ipvlan->dev))
 825                 ipvlan_ht_addr_add(ipvlan, addr);
 826
 827         return 0;
 828 }
 829
 830 static void ipvlan_del_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
 831 {
 832         struct ipvl_addr *addr;
 833
 834         spin_lock_bh(&ipvlan->addrs_lock);
 835         addr = ipvlan_find_addr(ipvlan, iaddr, is_v6);
 836         if (!addr) {
 837                 spin_unlock_bh(&ipvlan->addrs_lock);
 838                 return;
 839         }
 840
 841         ipvlan_ht_addr_del(addr);
 842         list_del_rcu(&addr->anode);
 843         spin_unlock_bh(&ipvlan->addrs_lock);
 844         kfree_rcu(addr, rcu);
 845 }
 846
 847 static bool ipvlan_is_valid_dev(const struct net_device *dev)
 848 {
 849         struct ipvl_dev *ipvlan = netdev_priv(dev);
 850
 851         if (!netif_is_ipvlan(dev))
 852                 return false;
 853
 854         if (!ipvlan || !ipvlan->port)
 855                 return false;
 856
 857         return true;
 858 }
 859
 860 #if IS_ENABLED(CONFIG_IPV6)
 861 static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
 862 {
 863         int ret = -EINVAL;
 864
 865         spin_lock_bh(&ipvlan->addrs_lock);
 866         if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true))
 867                 netif_err(ipvlan, ifup, ipvlan->dev,
 868                           "Failed to add IPv6=%pI6c addr for %s intf\n",
 869                           ip6_addr, ipvlan->dev->name);
 870         else
 871                 ret = ipvlan_add_addr(ipvlan, ip6_addr, true);
 872         spin_unlock_bh(&ipvlan->addrs_lock);
 873         return ret;
 874 }
 875
 876 static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
 877 {
 878         return ipvlan_del_addr(ipvlan, ip6_addr, true);
 879 }
 880
 881 static int ipvlan_addr6_event(struct notifier_block *unused,
 882                               unsigned long event, void *ptr)
 883 {
 884         struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr;
 885         struct net_device *dev = (struct net_device *)if6->idev->dev;
 886         struct ipvl_dev *ipvlan = netdev_priv(dev);
 887
 888         if (!ipvlan_is_valid_dev(dev))
 889                 return NOTIFY_DONE;
 890
 891         switch (event) {
 892         case NETDEV_UP:
 893                 if (ipvlan_add_addr6(ipvlan, &if6->addr))
 894                         return NOTIFY_BAD;
 895                 break;
 896
 897         case NETDEV_DOWN:
 898                 ipvlan_del_addr6(ipvlan, &if6->addr);
 899                 break;
 900         }
 901
 902         return NOTIFY_OK;
 903 }
 904
 905 static int ipvlan_addr6_validator_event(struct notifier_block *unused,
 906                                         unsigned long event, void *ptr)
 907 {
 908         struct in6_validator_info *i6vi = (struct in6_validator_info *)ptr;
 909         struct net_device *dev = (struct net_device *)i6vi->i6vi_dev->dev;
 910         struct ipvl_dev *ipvlan = netdev_priv(dev);
 911
 912         if (!ipvlan_is_valid_dev(dev))
 913                 return NOTIFY_DONE;
 914
 915         switch (event) {
 916         case NETDEV_UP:
 917                 if (ipvlan_addr_busy(ipvlan->port, &i6vi->i6vi_addr, true)) {
 918                         NL_SET_ERR_MSG(i6vi->extack,
 919                                        "Address already assigned to an ipvlan device");
 920                         return notifier_from_errno(-EADDRINUSE);
 921                 }
 922                 break;
 923         }
 924
 925         return NOTIFY_OK;
 926 }
 927 #endif
 928
 929 static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
 930 {
 931         int ret = -EINVAL;
 932
 933         spin_lock_bh(&ipvlan->addrs_lock);
 934         if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false))
 935                 netif_err(ipvlan, ifup, ipvlan->dev,
 936                           "Failed to add IPv4=%pI4 on %s intf.\n",
 937                           ip4_addr, ipvlan->dev->name);
 938         else
 939                 ret = ipvlan_add_addr(ipvlan, ip4_addr, false);
 940         spin_unlock_bh(&ipvlan->addrs_lock);
 941         return ret;
 942 }
 943
 944 static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
 945 {
 946         return ipvlan_del_addr(ipvlan, ip4_addr, false);
 947 }
 948
 949 static int ipvlan_addr4_event(struct notifier_block *unused,
 950                               unsigned long event, void *ptr)
 951 {
 952         struct in_ifaddr *if4 = (struct in_ifaddr *)ptr;
 953         struct net_device *dev = (struct net_device *)if4->ifa_dev->dev;
 954         struct ipvl_dev *ipvlan = netdev_priv(dev);
 955         struct in_addr ip4_addr;
 956
 957         if (!ipvlan_is_valid_dev(dev))
 958                 return NOTIFY_DONE;
 959
 960         switch (event) {
 961         case NETDEV_UP:
 962                 ip4_addr.s_addr = if4->ifa_address;
 963                 if (ipvlan_add_addr4(ipvlan, &ip4_addr))
 964                         return NOTIFY_BAD;
 965                 break;
 966
 967         case NETDEV_DOWN:
 968                 ip4_addr.s_addr = if4->ifa_address;
 969                 ipvlan_del_addr4(ipvlan, &ip4_addr);
 970                 break;
 971         }
 972
 973         return NOTIFY_OK;
 974 }
 975
 976 static int ipvlan_addr4_validator_event(struct notifier_block *unused,
 977                                         unsigned long event, void *ptr)
 978 {
 979         struct in_validator_info *ivi = (struct in_validator_info *)ptr;
 980         struct net_device *dev = (struct net_device *)ivi->ivi_dev->dev;
 981         struct ipvl_dev *ipvlan = netdev_priv(dev);
 982
 983         if (!ipvlan_is_valid_dev(dev))
 984                 return NOTIFY_DONE;
 985
 986         switch (event) {
 987         case NETDEV_UP:
 988                 if (ipvlan_addr_busy(ipvlan->port, &ivi->ivi_addr, false)) {
 989                         NL_SET_ERR_MSG(ivi->extack,
 990                                        "Address already assigned to an ipvlan device");
 991                         return notifier_from_errno(-EADDRINUSE);
 992                 }
 993                 break;
 994         }
 995
 996         return NOTIFY_OK;
 997 }
 998
 999 static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = {
1000         .notifier_call = ipvlan_addr4_event,
1001 };
1002
1003 static struct notifier_block ipvlan_addr4_vtor_notifier_block __read_mostly = {
1004         .notifier_call = ipvlan_addr4_validator_event,
1005 };
1006
1007 static struct notifier_block ipvlan_notifier_block __read_mostly = {
1008         .notifier_call = ipvlan_device_event,
1009 };
1010
1011 #if IS_ENABLED(CONFIG_IPV6)
1012 static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = {
1013         .notifier_call = ipvlan_addr6_event,
1014 };
1015
1016 static struct notifier_block ipvlan_addr6_vtor_notifier_block __read_mostly = {
1017         .notifier_call = ipvlan_addr6_validator_event,
1018 };
1019 #endif
1020
1021 static int __init ipvlan_init_module(void)
1022 {
1023         int err;
1024
1025         ipvlan_init_secret();
1026         register_netdevice_notifier(&ipvlan_notifier_block);
1027 #if IS_ENABLED(CONFIG_IPV6)
1028         register_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1029         register_inet6addr_validator_notifier(
1030             &ipvlan_addr6_vtor_notifier_block);
1031 #endif
1032         register_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1033         register_inetaddr_validator_notifier(&ipvlan_addr4_vtor_notifier_block);
1034
1035         err = ipvlan_l3s_init();
1036         if (err < 0)
1037                 goto error;
1038
1039         err = ipvlan_link_register(&ipvlan_link_ops);
1040         if (err < 0) {
1041                 ipvlan_l3s_cleanup();
1042                 goto error;
1043         }
1044
1045         return 0;
1046 error:
1047         unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1048         unregister_inetaddr_validator_notifier(
1049             &ipvlan_addr4_vtor_notifier_block);
1050 #if IS_ENABLED(CONFIG_IPV6)
1051         unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1052         unregister_inet6addr_validator_notifier(
1053             &ipvlan_addr6_vtor_notifier_block);
1054 #endif
1055         unregister_netdevice_notifier(&ipvlan_notifier_block);
1056         return err;
1057 }
1058
1059 static void __exit ipvlan_cleanup_module(void)
1060 {
1061         rtnl_link_unregister(&ipvlan_link_ops);
1062         ipvlan_l3s_cleanup();
1063         unregister_netdevice_notifier(&ipvlan_notifier_block);
1064         unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1065         unregister_inetaddr_validator_notifier(
1066             &ipvlan_addr4_vtor_notifier_block);
1067 #if IS_ENABLED(CONFIG_IPV6)
1068         unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1069         unregister_inet6addr_validator_notifier(
1070             &ipvlan_addr6_vtor_notifier_block);
1071 #endif
1072 }
1073
1074 module_init(ipvlan_init_module);
1075 module_exit(ipvlan_cleanup_module);
1076
1077 MODULE_LICENSE("GPL");
1078 MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>");
1079 MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs");
1080 MODULE_ALIAS_RTNL_LINK("ipvlan");