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