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         s->tx_errors = DEV_STATS_READ(dev, tx_errors);
 326 }
 327
 328 static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid)
 329 {
 330         struct ipvl_dev *ipvlan = netdev_priv(dev);
 331         struct net_device *phy_dev = ipvlan->phy_dev;
 332
 333         return vlan_vid_add(phy_dev, proto, vid);
 334 }
 335
 336 static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
 337                                    u16 vid)
 338 {
 339         struct ipvl_dev *ipvlan = netdev_priv(dev);
 340         struct net_device *phy_dev = ipvlan->phy_dev;
 341
 342         vlan_vid_del(phy_dev, proto, vid);
 343         return 0;
 344 }
 345
 346 static int ipvlan_get_iflink(const struct net_device *dev)
 347 {
 348         struct ipvl_dev *ipvlan = netdev_priv(dev);
 349
 350         return ipvlan->phy_dev->ifindex;
 351 }
 352
 353 static const struct net_device_ops ipvlan_netdev_ops = {
 354         .ndo_init               = ipvlan_init,
 355         .ndo_uninit             = ipvlan_uninit,
 356         .ndo_open               = ipvlan_open,
 357         .ndo_stop               = ipvlan_stop,
 358         .ndo_start_xmit         = ipvlan_start_xmit,
 359         .ndo_fix_features       = ipvlan_fix_features,
 360         .ndo_change_rx_flags    = ipvlan_change_rx_flags,
 361         .ndo_set_rx_mode        = ipvlan_set_multicast_mac_filter,
 362         .ndo_get_stats64        = ipvlan_get_stats64,
 363         .ndo_vlan_rx_add_vid    = ipvlan_vlan_rx_add_vid,
 364         .ndo_vlan_rx_kill_vid   = ipvlan_vlan_rx_kill_vid,
 365         .ndo_get_iflink         = ipvlan_get_iflink,
 366 };
 367
 368 static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
 369                               unsigned short type, const void *daddr,
 370                               const void *saddr, unsigned len)
 371 {
 372         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 373         struct net_device *phy_dev = ipvlan->phy_dev;
 374
 375         /* TODO Probably use a different field than dev_addr so that the
 376          * mac-address on the virtual device is portable and can be carried
 377          * while the packets use the mac-addr on the physical device.
 378          */
 379         return dev_hard_header(skb, phy_dev, type, daddr,
 380                                saddr ? : phy_dev->dev_addr, len);
 381 }
 382
 383 static const struct header_ops ipvlan_header_ops = {
 384         .create         = ipvlan_hard_header,
 385         .parse          = eth_header_parse,
 386         .cache          = eth_header_cache,
 387         .cache_update   = eth_header_cache_update,
 388 };
 389
 390 static void ipvlan_adjust_mtu(struct ipvl_dev *ipvlan, struct net_device *dev)
 391 {
 392         ipvlan->dev->mtu = dev->mtu;
 393 }
 394
 395 static bool netif_is_ipvlan(const struct net_device *dev)
 396 {
 397         /* both ipvlan and ipvtap devices use the same netdev_ops */
 398         return dev->netdev_ops == &ipvlan_netdev_ops;
 399 }
 400
 401 static int ipvlan_ethtool_get_link_ksettings(struct net_device *dev,
 402                                              struct ethtool_link_ksettings *cmd)
 403 {
 404         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 405
 406         return __ethtool_get_link_ksettings(ipvlan->phy_dev, cmd);
 407 }
 408
 409 static void ipvlan_ethtool_get_drvinfo(struct net_device *dev,
 410                                        struct ethtool_drvinfo *drvinfo)
 411 {
 412         strlcpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver));
 413         strlcpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version));
 414 }
 415
 416 static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev)
 417 {
 418         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 419
 420         return ipvlan->msg_enable;
 421 }
 422
 423 static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value)
 424 {
 425         struct ipvl_dev *ipvlan = netdev_priv(dev);
 426
 427         ipvlan->msg_enable = value;
 428 }
 429
 430 static const struct ethtool_ops ipvlan_ethtool_ops = {
 431         .get_link       = ethtool_op_get_link,
 432         .get_link_ksettings     = ipvlan_ethtool_get_link_ksettings,
 433         .get_drvinfo    = ipvlan_ethtool_get_drvinfo,
 434         .get_msglevel   = ipvlan_ethtool_get_msglevel,
 435         .set_msglevel   = ipvlan_ethtool_set_msglevel,
 436 };
 437
 438 static int ipvlan_nl_changelink(struct net_device *dev,
 439                                 struct nlattr *tb[], struct nlattr *data[],
 440                                 struct netlink_ext_ack *extack)
 441 {
 442         struct ipvl_dev *ipvlan = netdev_priv(dev);
 443         struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
 444         int err = 0;
 445
 446         if (!data)
 447                 return 0;
 448         if (!ns_capable(dev_net(ipvlan->phy_dev)->user_ns, CAP_NET_ADMIN))
 449                 return -EPERM;
 450
 451         if (data[IFLA_IPVLAN_MODE]) {
 452                 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
 453
 454                 err = ipvlan_set_port_mode(port, nmode, extack);
 455         }
 456
 457         if (!err && data[IFLA_IPVLAN_FLAGS]) {
 458                 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
 459
 460                 if (flags & IPVLAN_F_PRIVATE)
 461                         ipvlan_mark_private(port);
 462                 else
 463                         ipvlan_clear_private(port);
 464
 465                 if (flags & IPVLAN_F_VEPA)
 466                         ipvlan_mark_vepa(port);
 467                 else
 468                         ipvlan_clear_vepa(port);
 469         }
 470
 471         return err;
 472 }
 473
 474 static size_t ipvlan_nl_getsize(const struct net_device *dev)
 475 {
 476         return (0
 477                 + nla_total_size(2) /* IFLA_IPVLAN_MODE */
 478                 + nla_total_size(2) /* IFLA_IPVLAN_FLAGS */
 479                 );
 480 }
 481
 482 static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[],
 483                               struct netlink_ext_ack *extack)
 484 {
 485         if (!data)
 486                 return 0;
 487
 488         if (data[IFLA_IPVLAN_MODE]) {
 489                 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
 490
 491                 if (mode >= IPVLAN_MODE_MAX)
 492                         return -EINVAL;
 493         }
 494         if (data[IFLA_IPVLAN_FLAGS]) {
 495                 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
 496
 497                 /* Only two bits are used at this moment. */
 498                 if (flags & ~(IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
 499                         return -EINVAL;
 500                 /* Also both flags can't be active at the same time. */
 501                 if ((flags & (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) ==
 502                     (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
 503                         return -EINVAL;
 504         }
 505
 506         return 0;
 507 }
 508
 509 static int ipvlan_nl_fillinfo(struct sk_buff *skb,
 510                               const struct net_device *dev)
 511 {
 512         struct ipvl_dev *ipvlan = netdev_priv(dev);
 513         struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
 514         int ret = -EINVAL;
 515
 516         if (!port)
 517                 goto err;
 518
 519         ret = -EMSGSIZE;
 520         if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode))
 521                 goto err;
 522         if (nla_put_u16(skb, IFLA_IPVLAN_FLAGS, port->flags))
 523                 goto err;
 524
 525         return 0;
 526
 527 err:
 528         return ret;
 529 }
 530
 531 int ipvlan_link_new(struct net *src_net, struct net_device *dev,
 532                     struct nlattr *tb[], struct nlattr *data[],
 533                     struct netlink_ext_ack *extack)
 534 {
 535         struct ipvl_dev *ipvlan = netdev_priv(dev);
 536         struct ipvl_port *port;
 537         struct net_device *phy_dev;
 538         int err;
 539         u16 mode = IPVLAN_MODE_L3;
 540
 541         if (!tb[IFLA_LINK])
 542                 return -EINVAL;
 543
 544         phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
 545         if (!phy_dev)
 546                 return -ENODEV;
 547
 548         if (netif_is_ipvlan(phy_dev)) {
 549                 struct ipvl_dev *tmp = netdev_priv(phy_dev);
 550
 551                 phy_dev = tmp->phy_dev;
 552                 if (!ns_capable(dev_net(phy_dev)->user_ns, CAP_NET_ADMIN))
 553                         return -EPERM;
 554         } else if (!netif_is_ipvlan_port(phy_dev)) {
 555                 /* Exit early if the underlying link is invalid or busy */
 556                 if (phy_dev->type != ARPHRD_ETHER ||
 557                     phy_dev->flags & IFF_LOOPBACK) {
 558                         netdev_err(phy_dev,
 559                                    "Master is either lo or non-ether device\n");
 560                         return -EINVAL;
 561                 }
 562
 563                 if (netdev_is_rx_handler_busy(phy_dev)) {
 564                         netdev_err(phy_dev, "Device is already in use.\n");
 565                         return -EBUSY;
 566                 }
 567         }
 568
 569         ipvlan->phy_dev = phy_dev;
 570         ipvlan->dev = dev;
 571         ipvlan->sfeatures = IPVLAN_FEATURES;
 572         if (!tb[IFLA_MTU])
 573                 ipvlan_adjust_mtu(ipvlan, phy_dev);
 574         INIT_LIST_HEAD(&ipvlan->addrs);
 575         spin_lock_init(&ipvlan->addrs_lock);
 576
 577         /* TODO Probably put random address here to be presented to the
 578          * world but keep using the physical-dev address for the outgoing
 579          * packets.
 580          */
 581         memcpy(dev->dev_addr, phy_dev->dev_addr, ETH_ALEN);
 582
 583         dev->priv_flags |= IFF_NO_RX_HANDLER;
 584
 585         err = register_netdevice(dev);
 586         if (err < 0)
 587                 return err;
 588
 589         /* ipvlan_init() would have created the port, if required */
 590         port = ipvlan_port_get_rtnl(phy_dev);
 591         ipvlan->port = port;
 592
 593         /* If the port-id base is at the MAX value, then wrap it around and
 594          * begin from 0x1 again. This may be due to a busy system where lots
 595          * of slaves are getting created and deleted.
 596          */
 597         if (port->dev_id_start == 0xFFFE)
 598                 port->dev_id_start = 0x1;
 599
 600         /* Since L2 address is shared among all IPvlan slaves including
 601          * master, use unique 16 bit dev-ids to diffentiate among them.
 602          * Assign IDs between 0x1 and 0xFFFE (used by the master) to each
 603          * slave link [see addrconf_ifid_eui48()].
 604          */
 605         err = ida_simple_get(&port->ida, port->dev_id_start, 0xFFFE,
 606                              GFP_KERNEL);
 607         if (err < 0)
 608                 err = ida_simple_get(&port->ida, 0x1, port->dev_id_start,
 609                                      GFP_KERNEL);
 610         if (err < 0)
 611                 goto unregister_netdev;
 612         dev->dev_id = err;
 613
 614         /* Increment id-base to the next slot for the future assignment */
 615         port->dev_id_start = err + 1;
 616
 617         err = netdev_upper_dev_link(phy_dev, dev, extack);
 618         if (err)
 619                 goto remove_ida;
 620
 621         /* Flags are per port and latest update overrides. User has
 622          * to be consistent in setting it just like the mode attribute.
 623          */
 624         if (data && data[IFLA_IPVLAN_FLAGS])
 625                 port->flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
 626
 627         if (data && data[IFLA_IPVLAN_MODE])
 628                 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
 629
 630         err = ipvlan_set_port_mode(port, mode, extack);
 631         if (err)
 632                 goto unlink_netdev;
 633
 634         list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans);
 635         netif_stacked_transfer_operstate(phy_dev, dev);
 636         return 0;
 637
 638 unlink_netdev:
 639         netdev_upper_dev_unlink(phy_dev, dev);
 640 remove_ida:
 641         ida_simple_remove(&port->ida, dev->dev_id);
 642 unregister_netdev:
 643         unregister_netdevice(dev);
 644         return err;
 645 }
 646 EXPORT_SYMBOL_GPL(ipvlan_link_new);
 647
 648 void ipvlan_link_delete(struct net_device *dev, struct list_head *head)
 649 {
 650         struct ipvl_dev *ipvlan = netdev_priv(dev);
 651         struct ipvl_addr *addr, *next;
 652
 653         spin_lock_bh(&ipvlan->addrs_lock);
 654         list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) {
 655                 ipvlan_ht_addr_del(addr);
 656                 list_del_rcu(&addr->anode);
 657                 kfree_rcu(addr, rcu);
 658         }
 659         spin_unlock_bh(&ipvlan->addrs_lock);
 660
 661         ida_simple_remove(&ipvlan->port->ida, dev->dev_id);
 662         list_del_rcu(&ipvlan->pnode);
 663         unregister_netdevice_queue(dev, head);
 664         netdev_upper_dev_unlink(ipvlan->phy_dev, dev);
 665 }
 666 EXPORT_SYMBOL_GPL(ipvlan_link_delete);
 667
 668 void ipvlan_link_setup(struct net_device *dev)
 669 {
 670         ether_setup(dev);
 671
 672         dev->max_mtu = ETH_MAX_MTU;
 673         dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
 674         dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE;
 675         dev->netdev_ops = &ipvlan_netdev_ops;
 676         dev->needs_free_netdev = true;
 677         dev->header_ops = &ipvlan_header_ops;
 678         dev->ethtool_ops = &ipvlan_ethtool_ops;
 679 }
 680 EXPORT_SYMBOL_GPL(ipvlan_link_setup);
 681
 682 static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] =
 683 {
 684         [IFLA_IPVLAN_MODE] = { .type = NLA_U16 },
 685         [IFLA_IPVLAN_FLAGS] = { .type = NLA_U16 },
 686 };
 687
 688 static struct net *ipvlan_get_link_net(const struct net_device *dev)
 689 {
 690         struct ipvl_dev *ipvlan = netdev_priv(dev);
 691
 692         return dev_net(ipvlan->phy_dev);
 693 }
 694
 695 static struct rtnl_link_ops ipvlan_link_ops = {
 696         .kind           = "ipvlan",
 697         .priv_size      = sizeof(struct ipvl_dev),
 698
 699         .setup          = ipvlan_link_setup,
 700         .newlink        = ipvlan_link_new,
 701         .dellink        = ipvlan_link_delete,
 702         .get_link_net   = ipvlan_get_link_net,
 703 };
 704
 705 int ipvlan_link_register(struct rtnl_link_ops *ops)
 706 {
 707         ops->get_size   = ipvlan_nl_getsize;
 708         ops->policy     = ipvlan_nl_policy;
 709         ops->validate   = ipvlan_nl_validate;
 710         ops->fill_info  = ipvlan_nl_fillinfo;
 711         ops->changelink = ipvlan_nl_changelink;
 712         ops->maxtype    = IFLA_IPVLAN_MAX;
 713         return rtnl_link_register(ops);
 714 }
 715 EXPORT_SYMBOL_GPL(ipvlan_link_register);
 716
 717 static int ipvlan_device_event(struct notifier_block *unused,
 718                                unsigned long event, void *ptr)
 719 {
 720         struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr);
 721         struct netdev_notifier_pre_changeaddr_info *prechaddr_info;
 722         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 723         struct ipvl_dev *ipvlan, *next;
 724         struct ipvl_port *port;
 725         LIST_HEAD(lst_kill);
 726         int err;
 727
 728         if (!netif_is_ipvlan_port(dev))
 729                 return NOTIFY_DONE;
 730
 731         port = ipvlan_port_get_rtnl(dev);
 732
 733         switch (event) {
 734         case NETDEV_CHANGE:
 735                 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
 736                         netif_stacked_transfer_operstate(ipvlan->phy_dev,
 737                                                          ipvlan->dev);
 738                 break;
 739
 740         case NETDEV_REGISTER: {
 741                 struct net *oldnet, *newnet = dev_net(dev);
 742
 743                 oldnet = read_pnet(&port->pnet);
 744                 if (net_eq(newnet, oldnet))
 745                         break;
 746
 747                 write_pnet(&port->pnet, newnet);
 748
 749                 if (port->mode == IPVLAN_MODE_L3S)
 750                         ipvlan_migrate_l3s_hook(oldnet, newnet);
 751                 break;
 752         }
 753         case NETDEV_UNREGISTER:
 754                 if (dev->reg_state != NETREG_UNREGISTERING)
 755                         break;
 756
 757                 list_for_each_entry_safe(ipvlan, next, &port->ipvlans, pnode)
 758                         ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev,
 759                                                             &lst_kill);
 760                 unregister_netdevice_many(&lst_kill);
 761                 break;
 762
 763         case NETDEV_FEAT_CHANGE:
 764                 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
 765                         ipvlan->dev->gso_max_size = dev->gso_max_size;
 766                         ipvlan->dev->gso_max_segs = dev->gso_max_segs;
 767                         netdev_update_features(ipvlan->dev);
 768                 }
 769                 break;
 770
 771         case NETDEV_CHANGEMTU:
 772                 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
 773                         ipvlan_adjust_mtu(ipvlan, dev);
 774                 break;
 775
 776         case NETDEV_PRE_CHANGEADDR:
 777                 prechaddr_info = ptr;
 778                 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
 779                         err = dev_pre_changeaddr_notify(ipvlan->dev,
 780                                                     prechaddr_info->dev_addr,
 781                                                     extack);
 782                         if (err)
 783                                 return notifier_from_errno(err);
 784                 }
 785                 break;
 786
 787         case NETDEV_CHANGEADDR:
 788                 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
 789                         ether_addr_copy(ipvlan->dev->dev_addr, dev->dev_addr);
 790                         call_netdevice_notifiers(NETDEV_CHANGEADDR, ipvlan->dev);
 791                 }
 792                 break;
 793
 794         case NETDEV_PRE_TYPE_CHANGE:
 795                 /* Forbid underlying device to change its type. */
 796                 return NOTIFY_BAD;
 797         }
 798         return NOTIFY_DONE;
 799 }
 800
 801 /* the caller must held the addrs lock */
 802 static int ipvlan_add_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
 803 {
 804         struct ipvl_addr *addr;
 805
 806         addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC);
 807         if (!addr)
 808                 return -ENOMEM;
 809
 810         addr->master = ipvlan;
 811         if (!is_v6) {
 812                 memcpy(&addr->ip4addr, iaddr, sizeof(struct in_addr));
 813                 addr->atype = IPVL_IPV4;
 814 #if IS_ENABLED(CONFIG_IPV6)
 815         } else {
 816                 memcpy(&addr->ip6addr, iaddr, sizeof(struct in6_addr));
 817                 addr->atype = IPVL_IPV6;
 818 #endif
 819         }
 820
 821         list_add_tail_rcu(&addr->anode, &ipvlan->addrs);
 822
 823         /* If the interface is not up, the address will be added to the hash
 824          * list by ipvlan_open.
 825          */
 826         if (netif_running(ipvlan->dev))
 827                 ipvlan_ht_addr_add(ipvlan, addr);
 828
 829         return 0;
 830 }
 831
 832 static void ipvlan_del_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
 833 {
 834         struct ipvl_addr *addr;
 835
 836         spin_lock_bh(&ipvlan->addrs_lock);
 837         addr = ipvlan_find_addr(ipvlan, iaddr, is_v6);
 838         if (!addr) {
 839                 spin_unlock_bh(&ipvlan->addrs_lock);
 840                 return;
 841         }
 842
 843         ipvlan_ht_addr_del(addr);
 844         list_del_rcu(&addr->anode);
 845         spin_unlock_bh(&ipvlan->addrs_lock);
 846         kfree_rcu(addr, rcu);
 847 }
 848
 849 static bool ipvlan_is_valid_dev(const struct net_device *dev)
 850 {
 851         struct ipvl_dev *ipvlan = netdev_priv(dev);
 852
 853         if (!netif_is_ipvlan(dev))
 854                 return false;
 855
 856         if (!ipvlan || !ipvlan->port)
 857                 return false;
 858
 859         return true;
 860 }
 861
 862 #if IS_ENABLED(CONFIG_IPV6)
 863 static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
 864 {
 865         int ret = -EINVAL;
 866
 867         spin_lock_bh(&ipvlan->addrs_lock);
 868         if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true))
 869                 netif_err(ipvlan, ifup, ipvlan->dev,
 870                           "Failed to add IPv6=%pI6c addr for %s intf\n",
 871                           ip6_addr, ipvlan->dev->name);
 872         else
 873                 ret = ipvlan_add_addr(ipvlan, ip6_addr, true);
 874         spin_unlock_bh(&ipvlan->addrs_lock);
 875         return ret;
 876 }
 877
 878 static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
 879 {
 880         return ipvlan_del_addr(ipvlan, ip6_addr, true);
 881 }
 882
 883 static int ipvlan_addr6_event(struct notifier_block *unused,
 884                               unsigned long event, void *ptr)
 885 {
 886         struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr;
 887         struct net_device *dev = (struct net_device *)if6->idev->dev;
 888         struct ipvl_dev *ipvlan = netdev_priv(dev);
 889
 890         if (!ipvlan_is_valid_dev(dev))
 891                 return NOTIFY_DONE;
 892
 893         switch (event) {
 894         case NETDEV_UP:
 895                 if (ipvlan_add_addr6(ipvlan, &if6->addr))
 896                         return NOTIFY_BAD;
 897                 break;
 898
 899         case NETDEV_DOWN:
 900                 ipvlan_del_addr6(ipvlan, &if6->addr);
 901                 break;
 902         }
 903
 904         return NOTIFY_OK;
 905 }
 906
 907 static int ipvlan_addr6_validator_event(struct notifier_block *unused,
 908                                         unsigned long event, void *ptr)
 909 {
 910         struct in6_validator_info *i6vi = (struct in6_validator_info *)ptr;
 911         struct net_device *dev = (struct net_device *)i6vi->i6vi_dev->dev;
 912         struct ipvl_dev *ipvlan = netdev_priv(dev);
 913
 914         if (!ipvlan_is_valid_dev(dev))
 915                 return NOTIFY_DONE;
 916
 917         switch (event) {
 918         case NETDEV_UP:
 919                 if (ipvlan_addr_busy(ipvlan->port, &i6vi->i6vi_addr, true)) {
 920                         NL_SET_ERR_MSG(i6vi->extack,
 921                                        "Address already assigned to an ipvlan device");
 922                         return notifier_from_errno(-EADDRINUSE);
 923                 }
 924                 break;
 925         }
 926
 927         return NOTIFY_OK;
 928 }
 929 #endif
 930
 931 static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
 932 {
 933         int ret = -EINVAL;
 934
 935         spin_lock_bh(&ipvlan->addrs_lock);
 936         if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false))
 937                 netif_err(ipvlan, ifup, ipvlan->dev,
 938                           "Failed to add IPv4=%pI4 on %s intf.\n",
 939                           ip4_addr, ipvlan->dev->name);
 940         else
 941                 ret = ipvlan_add_addr(ipvlan, ip4_addr, false);
 942         spin_unlock_bh(&ipvlan->addrs_lock);
 943         return ret;
 944 }
 945
 946 static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
 947 {
 948         return ipvlan_del_addr(ipvlan, ip4_addr, false);
 949 }
 950
 951 static int ipvlan_addr4_event(struct notifier_block *unused,
 952                               unsigned long event, void *ptr)
 953 {
 954         struct in_ifaddr *if4 = (struct in_ifaddr *)ptr;
 955         struct net_device *dev = (struct net_device *)if4->ifa_dev->dev;
 956         struct ipvl_dev *ipvlan = netdev_priv(dev);
 957         struct in_addr ip4_addr;
 958
 959         if (!ipvlan_is_valid_dev(dev))
 960                 return NOTIFY_DONE;
 961
 962         switch (event) {
 963         case NETDEV_UP:
 964                 ip4_addr.s_addr = if4->ifa_address;
 965                 if (ipvlan_add_addr4(ipvlan, &ip4_addr))
 966                         return NOTIFY_BAD;
 967                 break;
 968
 969         case NETDEV_DOWN:
 970                 ip4_addr.s_addr = if4->ifa_address;
 971                 ipvlan_del_addr4(ipvlan, &ip4_addr);
 972                 break;
 973         }
 974
 975         return NOTIFY_OK;
 976 }
 977
 978 static int ipvlan_addr4_validator_event(struct notifier_block *unused,
 979                                         unsigned long event, void *ptr)
 980 {
 981         struct in_validator_info *ivi = (struct in_validator_info *)ptr;
 982         struct net_device *dev = (struct net_device *)ivi->ivi_dev->dev;
 983         struct ipvl_dev *ipvlan = netdev_priv(dev);
 984
 985         if (!ipvlan_is_valid_dev(dev))
 986                 return NOTIFY_DONE;
 987
 988         switch (event) {
 989         case NETDEV_UP:
 990                 if (ipvlan_addr_busy(ipvlan->port, &ivi->ivi_addr, false)) {
 991                         NL_SET_ERR_MSG(ivi->extack,
 992                                        "Address already assigned to an ipvlan device");
 993                         return notifier_from_errno(-EADDRINUSE);
 994                 }
 995                 break;
 996         }
 997
 998         return NOTIFY_OK;
 999 }
1000
1001 static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = {
1002         .notifier_call = ipvlan_addr4_event,
1003 };
1004
1005 static struct notifier_block ipvlan_addr4_vtor_notifier_block __read_mostly = {
1006         .notifier_call = ipvlan_addr4_validator_event,
1007 };
1008
1009 static struct notifier_block ipvlan_notifier_block __read_mostly = {
1010         .notifier_call = ipvlan_device_event,
1011 };
1012
1013 #if IS_ENABLED(CONFIG_IPV6)
1014 static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = {
1015         .notifier_call = ipvlan_addr6_event,
1016 };
1017
1018 static struct notifier_block ipvlan_addr6_vtor_notifier_block __read_mostly = {
1019         .notifier_call = ipvlan_addr6_validator_event,
1020 };
1021 #endif
1022
1023 static int __init ipvlan_init_module(void)
1024 {
1025         int err;
1026
1027         ipvlan_init_secret();
1028         register_netdevice_notifier(&ipvlan_notifier_block);
1029 #if IS_ENABLED(CONFIG_IPV6)
1030         register_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1031         register_inet6addr_validator_notifier(
1032             &ipvlan_addr6_vtor_notifier_block);
1033 #endif
1034         register_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1035         register_inetaddr_validator_notifier(&ipvlan_addr4_vtor_notifier_block);
1036
1037         err = ipvlan_l3s_init();
1038         if (err < 0)
1039                 goto error;
1040
1041         err = ipvlan_link_register(&ipvlan_link_ops);
1042         if (err < 0) {
1043                 ipvlan_l3s_cleanup();
1044                 goto error;
1045         }
1046
1047         return 0;
1048 error:
1049         unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1050         unregister_inetaddr_validator_notifier(
1051             &ipvlan_addr4_vtor_notifier_block);
1052 #if IS_ENABLED(CONFIG_IPV6)
1053         unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1054         unregister_inet6addr_validator_notifier(
1055             &ipvlan_addr6_vtor_notifier_block);
1056 #endif
1057         unregister_netdevice_notifier(&ipvlan_notifier_block);
1058         return err;
1059 }
1060
1061 static void __exit ipvlan_cleanup_module(void)
1062 {
1063         rtnl_link_unregister(&ipvlan_link_ops);
1064         ipvlan_l3s_cleanup();
1065         unregister_netdevice_notifier(&ipvlan_notifier_block);
1066         unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1067         unregister_inetaddr_validator_notifier(
1068             &ipvlan_addr4_vtor_notifier_block);
1069 #if IS_ENABLED(CONFIG_IPV6)
1070         unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1071         unregister_inet6addr_validator_notifier(
1072             &ipvlan_addr6_vtor_notifier_block);
1073 #endif
1074 }
1075
1076 module_init(ipvlan_init_module);
1077 module_exit(ipvlan_cleanup_module);
1078
1079 MODULE_LICENSE("GPL");
1080 MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>");
1081 MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs");
1082 MODULE_ALIAS_RTNL_LINK("ipvlan");