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