drivers/net/ipvlan/ipvlan_main.c

   1 /* Copyright (c) 2014 Mahesh Bandewar <maheshb@google.com>
   2  *
   3  * This program is free software; you can redistribute it and/or
   4  * modify it under the terms of the GNU General Public License as
   5  * published by the Free Software Foundation; either version 2 of
   6  * the License, or (at your option) any later version.
   7  *
   8  */
   9
  10 #include "ipvlan.h"
  11
  12 static unsigned int ipvlan_netid __read_mostly;
  13
  14 struct ipvlan_netns {
  15         unsigned int ipvl_nf_hook_refcnt;
  16 };
  17
  18 static const struct nf_hook_ops ipvl_nfops[] = {
  19         {
  20                 .hook     = ipvlan_nf_input,
  21                 .pf       = NFPROTO_IPV4,
  22                 .hooknum  = NF_INET_LOCAL_IN,
  23                 .priority = INT_MAX,
  24         },
  25 #if IS_ENABLED(CONFIG_IPV6)
  26         {
  27                 .hook     = ipvlan_nf_input,
  28                 .pf       = NFPROTO_IPV6,
  29                 .hooknum  = NF_INET_LOCAL_IN,
  30                 .priority = INT_MAX,
  31         },
  32 #endif
  33 };
  34
  35 static const struct l3mdev_ops ipvl_l3mdev_ops = {
  36         .l3mdev_l3_rcv = ipvlan_l3_rcv,
  37 };
  38
  39 static void ipvlan_adjust_mtu(struct ipvl_dev *ipvlan, struct net_device *dev)
  40 {
  41         ipvlan->dev->mtu = dev->mtu;
  42 }
  43
  44 static int ipvlan_register_nf_hook(struct net *net)
  45 {
  46         struct ipvlan_netns *vnet = net_generic(net, ipvlan_netid);
  47         int err = 0;
  48
  49         if (!vnet->ipvl_nf_hook_refcnt) {
  50                 err = nf_register_net_hooks(net, ipvl_nfops,
  51                                             ARRAY_SIZE(ipvl_nfops));
  52                 if (!err)
  53                         vnet->ipvl_nf_hook_refcnt = 1;
  54         } else {
  55                 vnet->ipvl_nf_hook_refcnt++;
  56         }
  57
  58         return err;
  59 }
  60
  61 static void ipvlan_unregister_nf_hook(struct net *net)
  62 {
  63         struct ipvlan_netns *vnet = net_generic(net, ipvlan_netid);
  64
  65         if (WARN_ON(!vnet->ipvl_nf_hook_refcnt))
  66                 return;
  67
  68         vnet->ipvl_nf_hook_refcnt--;
  69         if (!vnet->ipvl_nf_hook_refcnt)
  70                 nf_unregister_net_hooks(net, ipvl_nfops,
  71                                         ARRAY_SIZE(ipvl_nfops));
  72 }
  73
  74 static int ipvlan_set_port_mode(struct ipvl_port *port, u16 nval,
  75                                 struct netlink_ext_ack *extack)
  76 {
  77         struct ipvl_dev *ipvlan;
  78         struct net_device *mdev = port->dev;
  79         unsigned int flags;
  80         int err;
  81
  82         ASSERT_RTNL();
  83         if (port->mode != nval) {
  84                 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
  85                         flags = ipvlan->dev->flags;
  86                         if (nval == IPVLAN_MODE_L3 || nval == IPVLAN_MODE_L3S) {
  87                                 err = dev_change_flags(ipvlan->dev,
  88                                                        flags | IFF_NOARP,
  89                                                        extack);
  90                         } else {
  91                                 err = dev_change_flags(ipvlan->dev,
  92                                                        flags & ~IFF_NOARP,
  93                                                        extack);
  94                         }
  95                         if (unlikely(err))
  96                                 goto fail;
  97                 }
  98                 if (nval == IPVLAN_MODE_L3S) {
  99                         /* New mode is L3S */
 100                         err = ipvlan_register_nf_hook(read_pnet(&port->pnet));
 101                         if (!err) {
 102                                 mdev->l3mdev_ops = &ipvl_l3mdev_ops;
 103                                 mdev->priv_flags |= IFF_L3MDEV_RX_HANDLER;
 104                         } else
 105                                 goto fail;
 106                 } else if (port->mode == IPVLAN_MODE_L3S) {
 107                         /* Old mode was L3S */
 108                         mdev->priv_flags &= ~IFF_L3MDEV_RX_HANDLER;
 109                         ipvlan_unregister_nf_hook(read_pnet(&port->pnet));
 110                         mdev->l3mdev_ops = NULL;
 111                 }
 112                 port->mode = nval;
 113         }
 114         return 0;
 115
 116 fail:
 117         /* Undo the flags changes that have been done so far. */
 118         list_for_each_entry_continue_reverse(ipvlan, &port->ipvlans, pnode) {
 119                 flags = ipvlan->dev->flags;
 120                 if (port->mode == IPVLAN_MODE_L3 ||
 121                     port->mode == IPVLAN_MODE_L3S)
 122                         dev_change_flags(ipvlan->dev, flags | IFF_NOARP,
 123                                          NULL);
 124                 else
 125                         dev_change_flags(ipvlan->dev, flags & ~IFF_NOARP,
 126                                          NULL);
 127         }
 128
 129         return err;
 130 }
 131
 132 static int ipvlan_port_create(struct net_device *dev)
 133 {
 134         struct ipvl_port *port;
 135         int err, idx;
 136
 137         port = kzalloc(sizeof(struct ipvl_port), GFP_KERNEL);
 138         if (!port)
 139                 return -ENOMEM;
 140
 141         write_pnet(&port->pnet, dev_net(dev));
 142         port->dev = dev;
 143         port->mode = IPVLAN_MODE_L3;
 144         INIT_LIST_HEAD(&port->ipvlans);
 145         for (idx = 0; idx < IPVLAN_HASH_SIZE; idx++)
 146                 INIT_HLIST_HEAD(&port->hlhead[idx]);
 147
 148         skb_queue_head_init(&port->backlog);
 149         INIT_WORK(&port->wq, ipvlan_process_multicast);
 150         ida_init(&port->ida);
 151         port->dev_id_start = 1;
 152
 153         err = netdev_rx_handler_register(dev, ipvlan_handle_frame, port);
 154         if (err)
 155                 goto err;
 156
 157         return 0;
 158
 159 err:
 160         kfree(port);
 161         return err;
 162 }
 163
 164 static void ipvlan_port_destroy(struct net_device *dev)
 165 {
 166         struct ipvl_port *port = ipvlan_port_get_rtnl(dev);
 167         struct sk_buff *skb;
 168
 169         if (port->mode == IPVLAN_MODE_L3S) {
 170                 dev->priv_flags &= ~IFF_L3MDEV_RX_HANDLER;
 171                 ipvlan_unregister_nf_hook(dev_net(dev));
 172                 dev->l3mdev_ops = NULL;
 173         }
 174         netdev_rx_handler_unregister(dev);
 175         cancel_work_sync(&port->wq);
 176         while ((skb = __skb_dequeue(&port->backlog)) != NULL) {
 177                 if (skb->dev)
 178                         dev_put(skb->dev);
 179                 kfree_skb(skb);
 180         }
 181         ida_destroy(&port->ida);
 182         kfree(port);
 183 }
 184
 185 #define IPVLAN_FEATURES \
 186         (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
 187          NETIF_F_GSO | NETIF_F_TSO | NETIF_F_GSO_ROBUST | \
 188          NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
 189          NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
 190
 191 #define IPVLAN_STATE_MASK \
 192         ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
 193
 194 static int ipvlan_init(struct net_device *dev)
 195 {
 196         struct ipvl_dev *ipvlan = netdev_priv(dev);
 197         struct net_device *phy_dev = ipvlan->phy_dev;
 198         struct ipvl_port *port;
 199         int err;
 200
 201         dev->state = (dev->state & ~IPVLAN_STATE_MASK) |
 202                      (phy_dev->state & IPVLAN_STATE_MASK);
 203         dev->features = phy_dev->features & IPVLAN_FEATURES;
 204         dev->features |= NETIF_F_LLTX | NETIF_F_VLAN_CHALLENGED;
 205         dev->gso_max_size = phy_dev->gso_max_size;
 206         dev->gso_max_segs = phy_dev->gso_max_segs;
 207         dev->hard_header_len = phy_dev->hard_header_len;
 208
 209         netdev_lockdep_set_classes(dev);
 210
 211         ipvlan->pcpu_stats = netdev_alloc_pcpu_stats(struct ipvl_pcpu_stats);
 212         if (!ipvlan->pcpu_stats)
 213                 return -ENOMEM;
 214
 215         if (!netif_is_ipvlan_port(phy_dev)) {
 216                 err = ipvlan_port_create(phy_dev);
 217                 if (err < 0) {
 218                         free_percpu(ipvlan->pcpu_stats);
 219                         return err;
 220                 }
 221         }
 222         port = ipvlan_port_get_rtnl(phy_dev);
 223         port->count += 1;
 224         return 0;
 225 }
 226
 227 static void ipvlan_uninit(struct net_device *dev)
 228 {
 229         struct ipvl_dev *ipvlan = netdev_priv(dev);
 230         struct net_device *phy_dev = ipvlan->phy_dev;
 231         struct ipvl_port *port;
 232
 233         free_percpu(ipvlan->pcpu_stats);
 234
 235         port = ipvlan_port_get_rtnl(phy_dev);
 236         port->count -= 1;
 237         if (!port->count)
 238                 ipvlan_port_destroy(port->dev);
 239 }
 240
 241 static int ipvlan_open(struct net_device *dev)
 242 {
 243         struct ipvl_dev *ipvlan = netdev_priv(dev);
 244         struct net_device *phy_dev = ipvlan->phy_dev;
 245         struct ipvl_addr *addr;
 246
 247         if (ipvlan->port->mode == IPVLAN_MODE_L3 ||
 248             ipvlan->port->mode == IPVLAN_MODE_L3S)
 249                 dev->flags |= IFF_NOARP;
 250         else
 251                 dev->flags &= ~IFF_NOARP;
 252
 253         rcu_read_lock();
 254         list_for_each_entry_rcu(addr, &ipvlan->addrs, anode)
 255                 ipvlan_ht_addr_add(ipvlan, addr);
 256         rcu_read_unlock();
 257
 258         return dev_uc_add(phy_dev, phy_dev->dev_addr);
 259 }
 260
 261 static int ipvlan_stop(struct net_device *dev)
 262 {
 263         struct ipvl_dev *ipvlan = netdev_priv(dev);
 264         struct net_device *phy_dev = ipvlan->phy_dev;
 265         struct ipvl_addr *addr;
 266
 267         dev_uc_unsync(phy_dev, dev);
 268         dev_mc_unsync(phy_dev, dev);
 269
 270         dev_uc_del(phy_dev, phy_dev->dev_addr);
 271
 272         rcu_read_lock();
 273         list_for_each_entry_rcu(addr, &ipvlan->addrs, anode)
 274                 ipvlan_ht_addr_del(addr);
 275         rcu_read_unlock();
 276
 277         return 0;
 278 }
 279
 280 static netdev_tx_t ipvlan_start_xmit(struct sk_buff *skb,
 281                                      struct net_device *dev)
 282 {
 283         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 284         int skblen = skb->len;
 285         int ret;
 286
 287         ret = ipvlan_queue_xmit(skb, dev);
 288         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 289                 struct ipvl_pcpu_stats *pcptr;
 290
 291                 pcptr = this_cpu_ptr(ipvlan->pcpu_stats);
 292
 293                 u64_stats_update_begin(&pcptr->syncp);
 294                 pcptr->tx_pkts++;
 295                 pcptr->tx_bytes += skblen;
 296                 u64_stats_update_end(&pcptr->syncp);
 297         } else {
 298                 this_cpu_inc(ipvlan->pcpu_stats->tx_drps);
 299         }
 300         return ret;
 301 }
 302
 303 static netdev_features_t ipvlan_fix_features(struct net_device *dev,
 304                                              netdev_features_t features)
 305 {
 306         struct ipvl_dev *ipvlan = netdev_priv(dev);
 307
 308         return features & (ipvlan->sfeatures | ~IPVLAN_FEATURES);
 309 }
 310
 311 static void ipvlan_change_rx_flags(struct net_device *dev, int change)
 312 {
 313         struct ipvl_dev *ipvlan = netdev_priv(dev);
 314         struct net_device *phy_dev = ipvlan->phy_dev;
 315
 316         if (change & IFF_ALLMULTI)
 317                 dev_set_allmulti(phy_dev, dev->flags & IFF_ALLMULTI? 1 : -1);
 318 }
 319
 320 static void ipvlan_set_multicast_mac_filter(struct net_device *dev)
 321 {
 322         struct ipvl_dev *ipvlan = netdev_priv(dev);
 323
 324         if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
 325                 bitmap_fill(ipvlan->mac_filters, IPVLAN_MAC_FILTER_SIZE);
 326         } else {
 327                 struct netdev_hw_addr *ha;
 328                 DECLARE_BITMAP(mc_filters, IPVLAN_MAC_FILTER_SIZE);
 329
 330                 bitmap_zero(mc_filters, IPVLAN_MAC_FILTER_SIZE);
 331                 netdev_for_each_mc_addr(ha, dev)
 332                         __set_bit(ipvlan_mac_hash(ha->addr), mc_filters);
 333
 334                 /* Turn-on broadcast bit irrespective of address family,
 335                  * since broadcast is deferred to a work-queue, hence no
 336                  * impact on fast-path processing.
 337                  */
 338                 __set_bit(ipvlan_mac_hash(dev->broadcast), mc_filters);
 339
 340                 bitmap_copy(ipvlan->mac_filters, mc_filters,
 341                             IPVLAN_MAC_FILTER_SIZE);
 342         }
 343         dev_uc_sync(ipvlan->phy_dev, dev);
 344         dev_mc_sync(ipvlan->phy_dev, dev);
 345 }
 346
 347 static void ipvlan_get_stats64(struct net_device *dev,
 348                                struct rtnl_link_stats64 *s)
 349 {
 350         struct ipvl_dev *ipvlan = netdev_priv(dev);
 351
 352         if (ipvlan->pcpu_stats) {
 353                 struct ipvl_pcpu_stats *pcptr;
 354                 u64 rx_pkts, rx_bytes, rx_mcast, tx_pkts, tx_bytes;
 355                 u32 rx_errs = 0, tx_drps = 0;
 356                 u32 strt;
 357                 int idx;
 358
 359                 for_each_possible_cpu(idx) {
 360                         pcptr = per_cpu_ptr(ipvlan->pcpu_stats, idx);
 361                         do {
 362                                 strt= u64_stats_fetch_begin_irq(&pcptr->syncp);
 363                                 rx_pkts = pcptr->rx_pkts;
 364                                 rx_bytes = pcptr->rx_bytes;
 365                                 rx_mcast = pcptr->rx_mcast;
 366                                 tx_pkts = pcptr->tx_pkts;
 367                                 tx_bytes = pcptr->tx_bytes;
 368                         } while (u64_stats_fetch_retry_irq(&pcptr->syncp,
 369                                                            strt));
 370
 371                         s->rx_packets += rx_pkts;
 372                         s->rx_bytes += rx_bytes;
 373                         s->multicast += rx_mcast;
 374                         s->tx_packets += tx_pkts;
 375                         s->tx_bytes += tx_bytes;
 376
 377                         /* u32 values are updated without syncp protection. */
 378                         rx_errs += pcptr->rx_errs;
 379                         tx_drps += pcptr->tx_drps;
 380                 }
 381                 s->rx_errors = rx_errs;
 382                 s->rx_dropped = rx_errs;
 383                 s->tx_dropped = tx_drps;
 384         }
 385 }
 386
 387 static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid)
 388 {
 389         struct ipvl_dev *ipvlan = netdev_priv(dev);
 390         struct net_device *phy_dev = ipvlan->phy_dev;
 391
 392         return vlan_vid_add(phy_dev, proto, vid);
 393 }
 394
 395 static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
 396                                    u16 vid)
 397 {
 398         struct ipvl_dev *ipvlan = netdev_priv(dev);
 399         struct net_device *phy_dev = ipvlan->phy_dev;
 400
 401         vlan_vid_del(phy_dev, proto, vid);
 402         return 0;
 403 }
 404
 405 static int ipvlan_get_iflink(const struct net_device *dev)
 406 {
 407         struct ipvl_dev *ipvlan = netdev_priv(dev);
 408
 409         return ipvlan->phy_dev->ifindex;
 410 }
 411
 412 static const struct net_device_ops ipvlan_netdev_ops = {
 413         .ndo_init               = ipvlan_init,
 414         .ndo_uninit             = ipvlan_uninit,
 415         .ndo_open               = ipvlan_open,
 416         .ndo_stop               = ipvlan_stop,
 417         .ndo_start_xmit         = ipvlan_start_xmit,
 418         .ndo_fix_features       = ipvlan_fix_features,
 419         .ndo_change_rx_flags    = ipvlan_change_rx_flags,
 420         .ndo_set_rx_mode        = ipvlan_set_multicast_mac_filter,
 421         .ndo_get_stats64        = ipvlan_get_stats64,
 422         .ndo_vlan_rx_add_vid    = ipvlan_vlan_rx_add_vid,
 423         .ndo_vlan_rx_kill_vid   = ipvlan_vlan_rx_kill_vid,
 424         .ndo_get_iflink         = ipvlan_get_iflink,
 425 };
 426
 427 static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
 428                               unsigned short type, const void *daddr,
 429                               const void *saddr, unsigned len)
 430 {
 431         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 432         struct net_device *phy_dev = ipvlan->phy_dev;
 433
 434         /* TODO Probably use a different field than dev_addr so that the
 435          * mac-address on the virtual device is portable and can be carried
 436          * while the packets use the mac-addr on the physical device.
 437          */
 438         return dev_hard_header(skb, phy_dev, type, daddr,
 439                                saddr ? : phy_dev->dev_addr, len);
 440 }
 441
 442 static const struct header_ops ipvlan_header_ops = {
 443         .create         = ipvlan_hard_header,
 444         .parse          = eth_header_parse,
 445         .cache          = eth_header_cache,
 446         .cache_update   = eth_header_cache_update,
 447 };
 448
 449 static bool netif_is_ipvlan(const struct net_device *dev)
 450 {
 451         /* both ipvlan and ipvtap devices use the same netdev_ops */
 452         return dev->netdev_ops == &ipvlan_netdev_ops;
 453 }
 454
 455 static int ipvlan_ethtool_get_link_ksettings(struct net_device *dev,
 456                                              struct ethtool_link_ksettings *cmd)
 457 {
 458         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 459
 460         return __ethtool_get_link_ksettings(ipvlan->phy_dev, cmd);
 461 }
 462
 463 static void ipvlan_ethtool_get_drvinfo(struct net_device *dev,
 464                                        struct ethtool_drvinfo *drvinfo)
 465 {
 466         strlcpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver));
 467         strlcpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version));
 468 }
 469
 470 static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev)
 471 {
 472         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 473
 474         return ipvlan->msg_enable;
 475 }
 476
 477 static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value)
 478 {
 479         struct ipvl_dev *ipvlan = netdev_priv(dev);
 480
 481         ipvlan->msg_enable = value;
 482 }
 483
 484 static const struct ethtool_ops ipvlan_ethtool_ops = {
 485         .get_link       = ethtool_op_get_link,
 486         .get_link_ksettings     = ipvlan_ethtool_get_link_ksettings,
 487         .get_drvinfo    = ipvlan_ethtool_get_drvinfo,
 488         .get_msglevel   = ipvlan_ethtool_get_msglevel,
 489         .set_msglevel   = ipvlan_ethtool_set_msglevel,
 490 };
 491
 492 static int ipvlan_nl_changelink(struct net_device *dev,
 493                                 struct nlattr *tb[], struct nlattr *data[],
 494                                 struct netlink_ext_ack *extack)
 495 {
 496         struct ipvl_dev *ipvlan = netdev_priv(dev);
 497         struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
 498         int err = 0;
 499
 500         if (!data)
 501                 return 0;
 502         if (!ns_capable(dev_net(ipvlan->phy_dev)->user_ns, CAP_NET_ADMIN))
 503                 return -EPERM;
 504
 505         if (data[IFLA_IPVLAN_MODE]) {
 506                 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
 507
 508                 err = ipvlan_set_port_mode(port, nmode, extack);
 509         }
 510
 511         if (!err && data[IFLA_IPVLAN_FLAGS]) {
 512                 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
 513
 514                 if (flags & IPVLAN_F_PRIVATE)
 515                         ipvlan_mark_private(port);
 516                 else
 517                         ipvlan_clear_private(port);
 518
 519                 if (flags & IPVLAN_F_VEPA)
 520                         ipvlan_mark_vepa(port);
 521                 else
 522                         ipvlan_clear_vepa(port);
 523         }
 524
 525         return err;
 526 }
 527
 528 static size_t ipvlan_nl_getsize(const struct net_device *dev)
 529 {
 530         return (0
 531                 + nla_total_size(2) /* IFLA_IPVLAN_MODE */
 532                 + nla_total_size(2) /* IFLA_IPVLAN_FLAGS */
 533                 );
 534 }
 535
 536 static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[],
 537                               struct netlink_ext_ack *extack)
 538 {
 539         if (!data)
 540                 return 0;
 541
 542         if (data[IFLA_IPVLAN_MODE]) {
 543                 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
 544
 545                 if (mode >= IPVLAN_MODE_MAX)
 546                         return -EINVAL;
 547         }
 548         if (data[IFLA_IPVLAN_FLAGS]) {
 549                 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
 550
 551                 /* Only two bits are used at this moment. */
 552                 if (flags & ~(IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
 553                         return -EINVAL;
 554                 /* Also both flags can't be active at the same time. */
 555                 if ((flags & (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) ==
 556                     (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
 557                         return -EINVAL;
 558         }
 559
 560         return 0;
 561 }
 562
 563 static int ipvlan_nl_fillinfo(struct sk_buff *skb,
 564                               const struct net_device *dev)
 565 {
 566         struct ipvl_dev *ipvlan = netdev_priv(dev);
 567         struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
 568         int ret = -EINVAL;
 569
 570         if (!port)
 571                 goto err;
 572
 573         ret = -EMSGSIZE;
 574         if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode))
 575                 goto err;
 576         if (nla_put_u16(skb, IFLA_IPVLAN_FLAGS, port->flags))
 577                 goto err;
 578
 579         return 0;
 580
 581 err:
 582         return ret;
 583 }
 584
 585 int ipvlan_link_new(struct net *src_net, struct net_device *dev,
 586                     struct nlattr *tb[], struct nlattr *data[],
 587                     struct netlink_ext_ack *extack)
 588 {
 589         struct ipvl_dev *ipvlan = netdev_priv(dev);
 590         struct ipvl_port *port;
 591         struct net_device *phy_dev;
 592         int err;
 593         u16 mode = IPVLAN_MODE_L3;
 594
 595         if (!tb[IFLA_LINK])
 596                 return -EINVAL;
 597
 598         phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
 599         if (!phy_dev)
 600                 return -ENODEV;
 601
 602         if (netif_is_ipvlan(phy_dev)) {
 603                 struct ipvl_dev *tmp = netdev_priv(phy_dev);
 604
 605                 phy_dev = tmp->phy_dev;
 606                 if (!ns_capable(dev_net(phy_dev)->user_ns, CAP_NET_ADMIN))
 607                         return -EPERM;
 608         } else if (!netif_is_ipvlan_port(phy_dev)) {
 609                 /* Exit early if the underlying link is invalid or busy */
 610                 if (phy_dev->type != ARPHRD_ETHER ||
 611                     phy_dev->flags & IFF_LOOPBACK) {
 612                         netdev_err(phy_dev,
 613                                    "Master is either lo or non-ether device\n");
 614                         return -EINVAL;
 615                 }
 616
 617                 if (netdev_is_rx_handler_busy(phy_dev)) {
 618                         netdev_err(phy_dev, "Device is already in use.\n");
 619                         return -EBUSY;
 620                 }
 621         }
 622
 623         ipvlan->phy_dev = phy_dev;
 624         ipvlan->dev = dev;
 625         ipvlan->sfeatures = IPVLAN_FEATURES;
 626         if (!tb[IFLA_MTU])
 627                 ipvlan_adjust_mtu(ipvlan, phy_dev);
 628         INIT_LIST_HEAD(&ipvlan->addrs);
 629         spin_lock_init(&ipvlan->addrs_lock);
 630
 631         /* TODO Probably put random address here to be presented to the
 632          * world but keep using the physical-dev address for the outgoing
 633          * packets.
 634          */
 635         memcpy(dev->dev_addr, phy_dev->dev_addr, ETH_ALEN);
 636
 637         dev->priv_flags |= IFF_NO_RX_HANDLER;
 638
 639         err = register_netdevice(dev);
 640         if (err < 0)
 641                 return err;
 642
 643         /* ipvlan_init() would have created the port, if required */
 644         port = ipvlan_port_get_rtnl(phy_dev);
 645         ipvlan->port = port;
 646
 647         /* If the port-id base is at the MAX value, then wrap it around and
 648          * begin from 0x1 again. This may be due to a busy system where lots
 649          * of slaves are getting created and deleted.
 650          */
 651         if (port->dev_id_start == 0xFFFE)
 652                 port->dev_id_start = 0x1;
 653
 654         /* Since L2 address is shared among all IPvlan slaves including
 655          * master, use unique 16 bit dev-ids to diffentiate among them.
 656          * Assign IDs between 0x1 and 0xFFFE (used by the master) to each
 657          * slave link [see addrconf_ifid_eui48()].
 658          */
 659         err = ida_simple_get(&port->ida, port->dev_id_start, 0xFFFE,
 660                              GFP_KERNEL);
 661         if (err < 0)
 662                 err = ida_simple_get(&port->ida, 0x1, port->dev_id_start,
 663                                      GFP_KERNEL);
 664         if (err < 0)
 665                 goto unregister_netdev;
 666         dev->dev_id = err;
 667
 668         /* Increment id-base to the next slot for the future assignment */
 669         port->dev_id_start = err + 1;
 670
 671         err = netdev_upper_dev_link(phy_dev, dev, extack);
 672         if (err)
 673                 goto remove_ida;
 674
 675         /* Flags are per port and latest update overrides. User has
 676          * to be consistent in setting it just like the mode attribute.
 677          */
 678         if (data && data[IFLA_IPVLAN_FLAGS])
 679                 port->flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
 680
 681         if (data && data[IFLA_IPVLAN_MODE])
 682                 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
 683
 684         err = ipvlan_set_port_mode(port, mode, extack);
 685         if (err)
 686                 goto unlink_netdev;
 687
 688         list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans);
 689         netif_stacked_transfer_operstate(phy_dev, dev);
 690         return 0;
 691
 692 unlink_netdev:
 693         netdev_upper_dev_unlink(phy_dev, dev);
 694 remove_ida:
 695         ida_simple_remove(&port->ida, dev->dev_id);
 696 unregister_netdev:
 697         unregister_netdevice(dev);
 698         return err;
 699 }
 700 EXPORT_SYMBOL_GPL(ipvlan_link_new);
 701
 702 void ipvlan_link_delete(struct net_device *dev, struct list_head *head)
 703 {
 704         struct ipvl_dev *ipvlan = netdev_priv(dev);
 705         struct ipvl_addr *addr, *next;
 706
 707         spin_lock_bh(&ipvlan->addrs_lock);
 708         list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) {
 709                 ipvlan_ht_addr_del(addr);
 710                 list_del_rcu(&addr->anode);
 711                 kfree_rcu(addr, rcu);
 712         }
 713         spin_unlock_bh(&ipvlan->addrs_lock);
 714
 715         ida_simple_remove(&ipvlan->port->ida, dev->dev_id);
 716         list_del_rcu(&ipvlan->pnode);
 717         unregister_netdevice_queue(dev, head);
 718         netdev_upper_dev_unlink(ipvlan->phy_dev, dev);
 719 }
 720 EXPORT_SYMBOL_GPL(ipvlan_link_delete);
 721
 722 void ipvlan_link_setup(struct net_device *dev)
 723 {
 724         ether_setup(dev);
 725
 726         dev->max_mtu = ETH_MAX_MTU;
 727         dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
 728         dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE;
 729         dev->netdev_ops = &ipvlan_netdev_ops;
 730         dev->needs_free_netdev = true;
 731         dev->header_ops = &ipvlan_header_ops;
 732         dev->ethtool_ops = &ipvlan_ethtool_ops;
 733 }
 734 EXPORT_SYMBOL_GPL(ipvlan_link_setup);
 735
 736 static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] =
 737 {
 738         [IFLA_IPVLAN_MODE] = { .type = NLA_U16 },
 739         [IFLA_IPVLAN_FLAGS] = { .type = NLA_U16 },
 740 };
 741
 742 static struct rtnl_link_ops ipvlan_link_ops = {
 743         .kind           = "ipvlan",
 744         .priv_size      = sizeof(struct ipvl_dev),
 745
 746         .setup          = ipvlan_link_setup,
 747         .newlink        = ipvlan_link_new,
 748         .dellink        = ipvlan_link_delete,
 749 };
 750
 751 int ipvlan_link_register(struct rtnl_link_ops *ops)
 752 {
 753         ops->get_size   = ipvlan_nl_getsize;
 754         ops->policy     = ipvlan_nl_policy;
 755         ops->validate   = ipvlan_nl_validate;
 756         ops->fill_info  = ipvlan_nl_fillinfo;
 757         ops->changelink = ipvlan_nl_changelink;
 758         ops->maxtype    = IFLA_IPVLAN_MAX;
 759         return rtnl_link_register(ops);
 760 }
 761 EXPORT_SYMBOL_GPL(ipvlan_link_register);
 762
 763 static int ipvlan_device_event(struct notifier_block *unused,
 764                                unsigned long event, void *ptr)
 765 {
 766         struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr);
 767         struct netdev_notifier_pre_changeaddr_info *prechaddr_info;
 768         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 769         struct ipvl_dev *ipvlan, *next;
 770         struct ipvl_port *port;
 771         LIST_HEAD(lst_kill);
 772         int err;
 773
 774         if (!netif_is_ipvlan_port(dev))
 775                 return NOTIFY_DONE;
 776
 777         port = ipvlan_port_get_rtnl(dev);
 778
 779         switch (event) {
 780         case NETDEV_CHANGE:
 781                 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
 782                         netif_stacked_transfer_operstate(ipvlan->phy_dev,
 783                                                          ipvlan->dev);
 784                 break;
 785
 786         case NETDEV_REGISTER: {
 787                 struct net *oldnet, *newnet = dev_net(dev);
 788                 struct ipvlan_netns *old_vnet;
 789
 790                 oldnet = read_pnet(&port->pnet);
 791                 if (net_eq(newnet, oldnet))
 792                         break;
 793
 794                 write_pnet(&port->pnet, newnet);
 795
 796                 old_vnet = net_generic(oldnet, ipvlan_netid);
 797                 if (!old_vnet->ipvl_nf_hook_refcnt)
 798                         break;
 799
 800                 ipvlan_register_nf_hook(newnet);
 801                 ipvlan_unregister_nf_hook(oldnet);
 802                 break;
 803         }
 804         case NETDEV_UNREGISTER:
 805                 if (dev->reg_state != NETREG_UNREGISTERING)
 806                         break;
 807
 808                 list_for_each_entry_safe(ipvlan, next, &port->ipvlans, pnode)
 809                         ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev,
 810                                                             &lst_kill);
 811                 unregister_netdevice_many(&lst_kill);
 812                 break;
 813
 814         case NETDEV_FEAT_CHANGE:
 815                 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
 816                         ipvlan->dev->features = dev->features & IPVLAN_FEATURES;
 817                         ipvlan->dev->gso_max_size = dev->gso_max_size;
 818                         ipvlan->dev->gso_max_segs = dev->gso_max_segs;
 819                         netdev_features_change(ipvlan->dev);
 820                 }
 821                 break;
 822
 823         case NETDEV_CHANGEMTU:
 824                 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
 825                         ipvlan_adjust_mtu(ipvlan, dev);
 826                 break;
 827
 828         case NETDEV_PRE_CHANGEADDR:
 829                 prechaddr_info = ptr;
 830                 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
 831                         err = dev_pre_changeaddr_notify(ipvlan->dev,
 832                                                     prechaddr_info->dev_addr,
 833                                                     extack);
 834                         if (err)
 835                                 return notifier_from_errno(err);
 836                 }
 837                 break;
 838
 839         case NETDEV_CHANGEADDR:
 840                 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
 841                         ether_addr_copy(ipvlan->dev->dev_addr, dev->dev_addr);
 842                         call_netdevice_notifiers(NETDEV_CHANGEADDR, ipvlan->dev);
 843                 }
 844                 break;
 845
 846         case NETDEV_PRE_TYPE_CHANGE:
 847                 /* Forbid underlying device to change its type. */
 848                 return NOTIFY_BAD;
 849         }
 850         return NOTIFY_DONE;
 851 }
 852
 853 /* the caller must held the addrs lock */
 854 static int ipvlan_add_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
 855 {
 856         struct ipvl_addr *addr;
 857
 858         addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC);
 859         if (!addr)
 860                 return -ENOMEM;
 861
 862         addr->master = ipvlan;
 863         if (!is_v6) {
 864                 memcpy(&addr->ip4addr, iaddr, sizeof(struct in_addr));
 865                 addr->atype = IPVL_IPV4;
 866 #if IS_ENABLED(CONFIG_IPV6)
 867         } else {
 868                 memcpy(&addr->ip6addr, iaddr, sizeof(struct in6_addr));
 869                 addr->atype = IPVL_IPV6;
 870 #endif
 871         }
 872
 873         list_add_tail_rcu(&addr->anode, &ipvlan->addrs);
 874
 875         /* If the interface is not up, the address will be added to the hash
 876          * list by ipvlan_open.
 877          */
 878         if (netif_running(ipvlan->dev))
 879                 ipvlan_ht_addr_add(ipvlan, addr);
 880
 881         return 0;
 882 }
 883
 884 static void ipvlan_del_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
 885 {
 886         struct ipvl_addr *addr;
 887
 888         spin_lock_bh(&ipvlan->addrs_lock);
 889         addr = ipvlan_find_addr(ipvlan, iaddr, is_v6);
 890         if (!addr) {
 891                 spin_unlock_bh(&ipvlan->addrs_lock);
 892                 return;
 893         }
 894
 895         ipvlan_ht_addr_del(addr);
 896         list_del_rcu(&addr->anode);
 897         spin_unlock_bh(&ipvlan->addrs_lock);
 898         kfree_rcu(addr, rcu);
 899 }
 900
 901 static bool ipvlan_is_valid_dev(const struct net_device *dev)
 902 {
 903         struct ipvl_dev *ipvlan = netdev_priv(dev);
 904
 905         if (!netif_is_ipvlan(dev))
 906                 return false;
 907
 908         if (!ipvlan || !ipvlan->port)
 909                 return false;
 910
 911         return true;
 912 }
 913
 914 #if IS_ENABLED(CONFIG_IPV6)
 915 static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
 916 {
 917         int ret = -EINVAL;
 918
 919         spin_lock_bh(&ipvlan->addrs_lock);
 920         if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true))
 921                 netif_err(ipvlan, ifup, ipvlan->dev,
 922                           "Failed to add IPv6=%pI6c addr for %s intf\n",
 923                           ip6_addr, ipvlan->dev->name);
 924         else
 925                 ret = ipvlan_add_addr(ipvlan, ip6_addr, true);
 926         spin_unlock_bh(&ipvlan->addrs_lock);
 927         return ret;
 928 }
 929
 930 static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
 931 {
 932         return ipvlan_del_addr(ipvlan, ip6_addr, true);
 933 }
 934
 935 static int ipvlan_addr6_event(struct notifier_block *unused,
 936                               unsigned long event, void *ptr)
 937 {
 938         struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr;
 939         struct net_device *dev = (struct net_device *)if6->idev->dev;
 940         struct ipvl_dev *ipvlan = netdev_priv(dev);
 941
 942         if (!ipvlan_is_valid_dev(dev))
 943                 return NOTIFY_DONE;
 944
 945         switch (event) {
 946         case NETDEV_UP:
 947                 if (ipvlan_add_addr6(ipvlan, &if6->addr))
 948                         return NOTIFY_BAD;
 949                 break;
 950
 951         case NETDEV_DOWN:
 952                 ipvlan_del_addr6(ipvlan, &if6->addr);
 953                 break;
 954         }
 955
 956         return NOTIFY_OK;
 957 }
 958
 959 static int ipvlan_addr6_validator_event(struct notifier_block *unused,
 960                                         unsigned long event, void *ptr)
 961 {
 962         struct in6_validator_info *i6vi = (struct in6_validator_info *)ptr;
 963         struct net_device *dev = (struct net_device *)i6vi->i6vi_dev->dev;
 964         struct ipvl_dev *ipvlan = netdev_priv(dev);
 965
 966         if (!ipvlan_is_valid_dev(dev))
 967                 return NOTIFY_DONE;
 968
 969         switch (event) {
 970         case NETDEV_UP:
 971                 if (ipvlan_addr_busy(ipvlan->port, &i6vi->i6vi_addr, true)) {
 972                         NL_SET_ERR_MSG(i6vi->extack,
 973                                        "Address already assigned to an ipvlan device");
 974                         return notifier_from_errno(-EADDRINUSE);
 975                 }
 976                 break;
 977         }
 978
 979         return NOTIFY_OK;
 980 }
 981 #endif
 982
 983 static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
 984 {
 985         int ret = -EINVAL;
 986
 987         spin_lock_bh(&ipvlan->addrs_lock);
 988         if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false))
 989                 netif_err(ipvlan, ifup, ipvlan->dev,
 990                           "Failed to add IPv4=%pI4 on %s intf.\n",
 991                           ip4_addr, ipvlan->dev->name);
 992         else
 993                 ret = ipvlan_add_addr(ipvlan, ip4_addr, false);
 994         spin_unlock_bh(&ipvlan->addrs_lock);
 995         return ret;
 996 }
 997
 998 static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
 999 {
1000         return ipvlan_del_addr(ipvlan, ip4_addr, false);
1001 }
1002
1003 static int ipvlan_addr4_event(struct notifier_block *unused,
1004                               unsigned long event, void *ptr)
1005 {
1006         struct in_ifaddr *if4 = (struct in_ifaddr *)ptr;
1007         struct net_device *dev = (struct net_device *)if4->ifa_dev->dev;
1008         struct ipvl_dev *ipvlan = netdev_priv(dev);
1009         struct in_addr ip4_addr;
1010
1011         if (!ipvlan_is_valid_dev(dev))
1012                 return NOTIFY_DONE;
1013
1014         switch (event) {
1015         case NETDEV_UP:
1016                 ip4_addr.s_addr = if4->ifa_address;
1017                 if (ipvlan_add_addr4(ipvlan, &ip4_addr))
1018                         return NOTIFY_BAD;
1019                 break;
1020
1021         case NETDEV_DOWN:
1022                 ip4_addr.s_addr = if4->ifa_address;
1023                 ipvlan_del_addr4(ipvlan, &ip4_addr);
1024                 break;
1025         }
1026
1027         return NOTIFY_OK;
1028 }
1029
1030 static int ipvlan_addr4_validator_event(struct notifier_block *unused,
1031                                         unsigned long event, void *ptr)
1032 {
1033         struct in_validator_info *ivi = (struct in_validator_info *)ptr;
1034         struct net_device *dev = (struct net_device *)ivi->ivi_dev->dev;
1035         struct ipvl_dev *ipvlan = netdev_priv(dev);
1036
1037         if (!ipvlan_is_valid_dev(dev))
1038                 return NOTIFY_DONE;
1039
1040         switch (event) {
1041         case NETDEV_UP:
1042                 if (ipvlan_addr_busy(ipvlan->port, &ivi->ivi_addr, false)) {
1043                         NL_SET_ERR_MSG(ivi->extack,
1044                                        "Address already assigned to an ipvlan device");
1045                         return notifier_from_errno(-EADDRINUSE);
1046                 }
1047                 break;
1048         }
1049
1050         return NOTIFY_OK;
1051 }
1052
1053 static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = {
1054         .notifier_call = ipvlan_addr4_event,
1055 };
1056
1057 static struct notifier_block ipvlan_addr4_vtor_notifier_block __read_mostly = {
1058         .notifier_call = ipvlan_addr4_validator_event,
1059 };
1060
1061 static struct notifier_block ipvlan_notifier_block __read_mostly = {
1062         .notifier_call = ipvlan_device_event,
1063 };
1064
1065 #if IS_ENABLED(CONFIG_IPV6)
1066 static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = {
1067         .notifier_call = ipvlan_addr6_event,
1068 };
1069
1070 static struct notifier_block ipvlan_addr6_vtor_notifier_block __read_mostly = {
1071         .notifier_call = ipvlan_addr6_validator_event,
1072 };
1073 #endif
1074
1075 static void ipvlan_ns_exit(struct net *net)
1076 {
1077         struct ipvlan_netns *vnet = net_generic(net, ipvlan_netid);
1078
1079         if (WARN_ON_ONCE(vnet->ipvl_nf_hook_refcnt)) {
1080                 vnet->ipvl_nf_hook_refcnt = 0;
1081                 nf_unregister_net_hooks(net, ipvl_nfops,
1082                                         ARRAY_SIZE(ipvl_nfops));
1083         }
1084 }
1085
1086 static struct pernet_operations ipvlan_net_ops = {
1087         .id = &ipvlan_netid,
1088         .size = sizeof(struct ipvlan_netns),
1089         .exit = ipvlan_ns_exit,
1090 };
1091
1092 static int __init ipvlan_init_module(void)
1093 {
1094         int err;
1095
1096         ipvlan_init_secret();
1097         register_netdevice_notifier(&ipvlan_notifier_block);
1098 #if IS_ENABLED(CONFIG_IPV6)
1099         register_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1100         register_inet6addr_validator_notifier(
1101             &ipvlan_addr6_vtor_notifier_block);
1102 #endif
1103         register_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1104         register_inetaddr_validator_notifier(&ipvlan_addr4_vtor_notifier_block);
1105
1106         err = register_pernet_subsys(&ipvlan_net_ops);
1107         if (err < 0)
1108                 goto error;
1109
1110         err = ipvlan_link_register(&ipvlan_link_ops);
1111         if (err < 0) {
1112                 unregister_pernet_subsys(&ipvlan_net_ops);
1113                 goto error;
1114         }
1115
1116         return 0;
1117 error:
1118         unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1119         unregister_inetaddr_validator_notifier(
1120             &ipvlan_addr4_vtor_notifier_block);
1121 #if IS_ENABLED(CONFIG_IPV6)
1122         unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1123         unregister_inet6addr_validator_notifier(
1124             &ipvlan_addr6_vtor_notifier_block);
1125 #endif
1126         unregister_netdevice_notifier(&ipvlan_notifier_block);
1127         return err;
1128 }
1129
1130 static void __exit ipvlan_cleanup_module(void)
1131 {
1132         rtnl_link_unregister(&ipvlan_link_ops);
1133         unregister_pernet_subsys(&ipvlan_net_ops);
1134         unregister_netdevice_notifier(&ipvlan_notifier_block);
1135         unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1136         unregister_inetaddr_validator_notifier(
1137             &ipvlan_addr4_vtor_notifier_block);
1138 #if IS_ENABLED(CONFIG_IPV6)
1139         unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1140         unregister_inet6addr_validator_notifier(
1141             &ipvlan_addr6_vtor_notifier_block);
1142 #endif
1143 }
1144
1145 module_init(ipvlan_init_module);
1146 module_exit(ipvlan_cleanup_module);
1147
1148 MODULE_LICENSE("GPL");
1149 MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>");
1150 MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs");
1151 MODULE_ALIAS_RTNL_LINK("ipvlan");