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 {
  76         struct ipvl_dev *ipvlan;
  77         struct net_device *mdev = port->dev;
  78         unsigned int flags;
  79         int err;
  80
  81         ASSERT_RTNL();
  82         if (port->mode != nval) {
  83                 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
  84                         flags = ipvlan->dev->flags;
  85                         if (nval == IPVLAN_MODE_L3 || nval == IPVLAN_MODE_L3S) {
  86                                 err = dev_change_flags(ipvlan->dev,
  87                                                        flags | IFF_NOARP);
  88                         } else {
  89                                 err = dev_change_flags(ipvlan->dev,
  90                                                        flags & ~IFF_NOARP);
  91                         }
  92                         if (unlikely(err))
  93                                 goto fail;
  94                 }
  95                 if (nval == IPVLAN_MODE_L3S) {
  96                         /* New mode is L3S */
  97                         err = ipvlan_register_nf_hook(read_pnet(&port->pnet));
  98                         if (!err) {
  99                                 mdev->l3mdev_ops = &ipvl_l3mdev_ops;
 100                                 mdev->priv_flags |= IFF_L3MDEV_MASTER;
 101                         } else
 102                                 goto fail;
 103                 } else if (port->mode == IPVLAN_MODE_L3S) {
 104                         /* Old mode was L3S */
 105                         mdev->priv_flags &= ~IFF_L3MDEV_MASTER;
 106                         ipvlan_unregister_nf_hook(read_pnet(&port->pnet));
 107                         mdev->l3mdev_ops = NULL;
 108                 }
 109                 port->mode = nval;
 110         }
 111         return 0;
 112
 113 fail:
 114         /* Undo the flags changes that have been done so far. */
 115         list_for_each_entry_continue_reverse(ipvlan, &port->ipvlans, pnode) {
 116                 flags = ipvlan->dev->flags;
 117                 if (port->mode == IPVLAN_MODE_L3 ||
 118                     port->mode == IPVLAN_MODE_L3S)
 119                         dev_change_flags(ipvlan->dev, flags | IFF_NOARP);
 120                 else
 121                         dev_change_flags(ipvlan->dev, flags & ~IFF_NOARP);
 122         }
 123
 124         return err;
 125 }
 126
 127 static int ipvlan_port_create(struct net_device *dev)
 128 {
 129         struct ipvl_port *port;
 130         int err, idx;
 131
 132         port = kzalloc(sizeof(struct ipvl_port), GFP_KERNEL);
 133         if (!port)
 134                 return -ENOMEM;
 135
 136         write_pnet(&port->pnet, dev_net(dev));
 137         port->dev = dev;
 138         port->mode = IPVLAN_MODE_L3;
 139         INIT_LIST_HEAD(&port->ipvlans);
 140         for (idx = 0; idx < IPVLAN_HASH_SIZE; idx++)
 141                 INIT_HLIST_HEAD(&port->hlhead[idx]);
 142
 143         skb_queue_head_init(&port->backlog);
 144         INIT_WORK(&port->wq, ipvlan_process_multicast);
 145         ida_init(&port->ida);
 146         port->dev_id_start = 1;
 147
 148         err = netdev_rx_handler_register(dev, ipvlan_handle_frame, port);
 149         if (err)
 150                 goto err;
 151
 152         return 0;
 153
 154 err:
 155         kfree(port);
 156         return err;
 157 }
 158
 159 static void ipvlan_port_destroy(struct net_device *dev)
 160 {
 161         struct ipvl_port *port = ipvlan_port_get_rtnl(dev);
 162         struct sk_buff *skb;
 163
 164         if (port->mode == IPVLAN_MODE_L3S) {
 165                 dev->priv_flags &= ~IFF_L3MDEV_MASTER;
 166                 ipvlan_unregister_nf_hook(dev_net(dev));
 167                 dev->l3mdev_ops = NULL;
 168         }
 169         netdev_rx_handler_unregister(dev);
 170         cancel_work_sync(&port->wq);
 171         while ((skb = __skb_dequeue(&port->backlog)) != NULL) {
 172                 if (skb->dev)
 173                         dev_put(skb->dev);
 174                 kfree_skb(skb);
 175         }
 176         ida_destroy(&port->ida);
 177         kfree(port);
 178 }
 179
 180 #define IPVLAN_FEATURES \
 181         (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
 182          NETIF_F_GSO | NETIF_F_TSO | NETIF_F_GSO_ROBUST | \
 183          NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
 184          NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
 185
 186 #define IPVLAN_STATE_MASK \
 187         ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
 188
 189 static int ipvlan_init(struct net_device *dev)
 190 {
 191         struct ipvl_dev *ipvlan = netdev_priv(dev);
 192         struct net_device *phy_dev = ipvlan->phy_dev;
 193         struct ipvl_port *port;
 194         int err;
 195
 196         dev->state = (dev->state & ~IPVLAN_STATE_MASK) |
 197                      (phy_dev->state & IPVLAN_STATE_MASK);
 198         dev->features = phy_dev->features & IPVLAN_FEATURES;
 199         dev->features |= NETIF_F_LLTX | NETIF_F_VLAN_CHALLENGED;
 200         dev->gso_max_size = phy_dev->gso_max_size;
 201         dev->gso_max_segs = phy_dev->gso_max_segs;
 202         dev->hard_header_len = phy_dev->hard_header_len;
 203
 204         netdev_lockdep_set_classes(dev);
 205
 206         ipvlan->pcpu_stats = netdev_alloc_pcpu_stats(struct ipvl_pcpu_stats);
 207         if (!ipvlan->pcpu_stats)
 208                 return -ENOMEM;
 209
 210         if (!netif_is_ipvlan_port(phy_dev)) {
 211                 err = ipvlan_port_create(phy_dev);
 212                 if (err < 0) {
 213                         free_percpu(ipvlan->pcpu_stats);
 214                         return err;
 215                 }
 216         }
 217         port = ipvlan_port_get_rtnl(phy_dev);
 218         port->count += 1;
 219         return 0;
 220 }
 221
 222 static void ipvlan_uninit(struct net_device *dev)
 223 {
 224         struct ipvl_dev *ipvlan = netdev_priv(dev);
 225         struct net_device *phy_dev = ipvlan->phy_dev;
 226         struct ipvl_port *port;
 227
 228         free_percpu(ipvlan->pcpu_stats);
 229
 230         port = ipvlan_port_get_rtnl(phy_dev);
 231         port->count -= 1;
 232         if (!port->count)
 233                 ipvlan_port_destroy(port->dev);
 234 }
 235
 236 static int ipvlan_open(struct net_device *dev)
 237 {
 238         struct ipvl_dev *ipvlan = netdev_priv(dev);
 239         struct net_device *phy_dev = ipvlan->phy_dev;
 240         struct ipvl_addr *addr;
 241
 242         if (ipvlan->port->mode == IPVLAN_MODE_L3 ||
 243             ipvlan->port->mode == IPVLAN_MODE_L3S)
 244                 dev->flags |= IFF_NOARP;
 245         else
 246                 dev->flags &= ~IFF_NOARP;
 247
 248         rcu_read_lock();
 249         list_for_each_entry_rcu(addr, &ipvlan->addrs, anode)
 250                 ipvlan_ht_addr_add(ipvlan, addr);
 251         rcu_read_unlock();
 252
 253         return dev_uc_add(phy_dev, phy_dev->dev_addr);
 254 }
 255
 256 static int ipvlan_stop(struct net_device *dev)
 257 {
 258         struct ipvl_dev *ipvlan = netdev_priv(dev);
 259         struct net_device *phy_dev = ipvlan->phy_dev;
 260         struct ipvl_addr *addr;
 261
 262         dev_uc_unsync(phy_dev, dev);
 263         dev_mc_unsync(phy_dev, dev);
 264
 265         dev_uc_del(phy_dev, phy_dev->dev_addr);
 266
 267         rcu_read_lock();
 268         list_for_each_entry_rcu(addr, &ipvlan->addrs, anode)
 269                 ipvlan_ht_addr_del(addr);
 270         rcu_read_unlock();
 271
 272         return 0;
 273 }
 274
 275 static netdev_tx_t ipvlan_start_xmit(struct sk_buff *skb,
 276                                      struct net_device *dev)
 277 {
 278         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 279         int skblen = skb->len;
 280         int ret;
 281
 282         ret = ipvlan_queue_xmit(skb, dev);
 283         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 284                 struct ipvl_pcpu_stats *pcptr;
 285
 286                 pcptr = this_cpu_ptr(ipvlan->pcpu_stats);
 287
 288                 u64_stats_update_begin(&pcptr->syncp);
 289                 pcptr->tx_pkts++;
 290                 pcptr->tx_bytes += skblen;
 291                 u64_stats_update_end(&pcptr->syncp);
 292         } else {
 293                 this_cpu_inc(ipvlan->pcpu_stats->tx_drps);
 294         }
 295         return ret;
 296 }
 297
 298 static netdev_features_t ipvlan_fix_features(struct net_device *dev,
 299                                              netdev_features_t features)
 300 {
 301         struct ipvl_dev *ipvlan = netdev_priv(dev);
 302
 303         return features & (ipvlan->sfeatures | ~IPVLAN_FEATURES);
 304 }
 305
 306 static void ipvlan_change_rx_flags(struct net_device *dev, int change)
 307 {
 308         struct ipvl_dev *ipvlan = netdev_priv(dev);
 309         struct net_device *phy_dev = ipvlan->phy_dev;
 310
 311         if (change & IFF_ALLMULTI)
 312                 dev_set_allmulti(phy_dev, dev->flags & IFF_ALLMULTI? 1 : -1);
 313 }
 314
 315 static void ipvlan_set_multicast_mac_filter(struct net_device *dev)
 316 {
 317         struct ipvl_dev *ipvlan = netdev_priv(dev);
 318
 319         if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
 320                 bitmap_fill(ipvlan->mac_filters, IPVLAN_MAC_FILTER_SIZE);
 321         } else {
 322                 struct netdev_hw_addr *ha;
 323                 DECLARE_BITMAP(mc_filters, IPVLAN_MAC_FILTER_SIZE);
 324
 325                 bitmap_zero(mc_filters, IPVLAN_MAC_FILTER_SIZE);
 326                 netdev_for_each_mc_addr(ha, dev)
 327                         __set_bit(ipvlan_mac_hash(ha->addr), mc_filters);
 328
 329                 /* Turn-on broadcast bit irrespective of address family,
 330                  * since broadcast is deferred to a work-queue, hence no
 331                  * impact on fast-path processing.
 332                  */
 333                 __set_bit(ipvlan_mac_hash(dev->broadcast), mc_filters);
 334
 335                 bitmap_copy(ipvlan->mac_filters, mc_filters,
 336                             IPVLAN_MAC_FILTER_SIZE);
 337         }
 338         dev_uc_sync(ipvlan->phy_dev, dev);
 339         dev_mc_sync(ipvlan->phy_dev, dev);
 340 }
 341
 342 static void ipvlan_get_stats64(struct net_device *dev,
 343                                struct rtnl_link_stats64 *s)
 344 {
 345         struct ipvl_dev *ipvlan = netdev_priv(dev);
 346
 347         if (ipvlan->pcpu_stats) {
 348                 struct ipvl_pcpu_stats *pcptr;
 349                 u64 rx_pkts, rx_bytes, rx_mcast, tx_pkts, tx_bytes;
 350                 u32 rx_errs = 0, tx_drps = 0;
 351                 u32 strt;
 352                 int idx;
 353
 354                 for_each_possible_cpu(idx) {
 355                         pcptr = per_cpu_ptr(ipvlan->pcpu_stats, idx);
 356                         do {
 357                                 strt= u64_stats_fetch_begin_irq(&pcptr->syncp);
 358                                 rx_pkts = pcptr->rx_pkts;
 359                                 rx_bytes = pcptr->rx_bytes;
 360                                 rx_mcast = pcptr->rx_mcast;
 361                                 tx_pkts = pcptr->tx_pkts;
 362                                 tx_bytes = pcptr->tx_bytes;
 363                         } while (u64_stats_fetch_retry_irq(&pcptr->syncp,
 364                                                            strt));
 365
 366                         s->rx_packets += rx_pkts;
 367                         s->rx_bytes += rx_bytes;
 368                         s->multicast += rx_mcast;
 369                         s->tx_packets += tx_pkts;
 370                         s->tx_bytes += tx_bytes;
 371
 372                         /* u32 values are updated without syncp protection. */
 373                         rx_errs += pcptr->rx_errs;
 374                         tx_drps += pcptr->tx_drps;
 375                 }
 376                 s->rx_errors = rx_errs;
 377                 s->rx_dropped = rx_errs;
 378                 s->tx_dropped = tx_drps;
 379         }
 380 }
 381
 382 static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid)
 383 {
 384         struct ipvl_dev *ipvlan = netdev_priv(dev);
 385         struct net_device *phy_dev = ipvlan->phy_dev;
 386
 387         return vlan_vid_add(phy_dev, proto, vid);
 388 }
 389
 390 static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
 391                                    u16 vid)
 392 {
 393         struct ipvl_dev *ipvlan = netdev_priv(dev);
 394         struct net_device *phy_dev = ipvlan->phy_dev;
 395
 396         vlan_vid_del(phy_dev, proto, vid);
 397         return 0;
 398 }
 399
 400 static int ipvlan_get_iflink(const struct net_device *dev)
 401 {
 402         struct ipvl_dev *ipvlan = netdev_priv(dev);
 403
 404         return ipvlan->phy_dev->ifindex;
 405 }
 406
 407 static const struct net_device_ops ipvlan_netdev_ops = {
 408         .ndo_init               = ipvlan_init,
 409         .ndo_uninit             = ipvlan_uninit,
 410         .ndo_open               = ipvlan_open,
 411         .ndo_stop               = ipvlan_stop,
 412         .ndo_start_xmit         = ipvlan_start_xmit,
 413         .ndo_fix_features       = ipvlan_fix_features,
 414         .ndo_change_rx_flags    = ipvlan_change_rx_flags,
 415         .ndo_set_rx_mode        = ipvlan_set_multicast_mac_filter,
 416         .ndo_get_stats64        = ipvlan_get_stats64,
 417         .ndo_vlan_rx_add_vid    = ipvlan_vlan_rx_add_vid,
 418         .ndo_vlan_rx_kill_vid   = ipvlan_vlan_rx_kill_vid,
 419         .ndo_get_iflink         = ipvlan_get_iflink,
 420 };
 421
 422 static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
 423                               unsigned short type, const void *daddr,
 424                               const void *saddr, unsigned len)
 425 {
 426         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 427         struct net_device *phy_dev = ipvlan->phy_dev;
 428
 429         /* TODO Probably use a different field than dev_addr so that the
 430          * mac-address on the virtual device is portable and can be carried
 431          * while the packets use the mac-addr on the physical device.
 432          */
 433         return dev_hard_header(skb, phy_dev, type, daddr,
 434                                saddr ? : phy_dev->dev_addr, len);
 435 }
 436
 437 static const struct header_ops ipvlan_header_ops = {
 438         .create         = ipvlan_hard_header,
 439         .parse          = eth_header_parse,
 440         .cache          = eth_header_cache,
 441         .cache_update   = eth_header_cache_update,
 442 };
 443
 444 static bool netif_is_ipvlan(const struct net_device *dev)
 445 {
 446         /* both ipvlan and ipvtap devices use the same netdev_ops */
 447         return dev->netdev_ops == &ipvlan_netdev_ops;
 448 }
 449
 450 static int ipvlan_ethtool_get_link_ksettings(struct net_device *dev,
 451                                              struct ethtool_link_ksettings *cmd)
 452 {
 453         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 454
 455         return __ethtool_get_link_ksettings(ipvlan->phy_dev, cmd);
 456 }
 457
 458 static void ipvlan_ethtool_get_drvinfo(struct net_device *dev,
 459                                        struct ethtool_drvinfo *drvinfo)
 460 {
 461         strlcpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver));
 462         strlcpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version));
 463 }
 464
 465 static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev)
 466 {
 467         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 468
 469         return ipvlan->msg_enable;
 470 }
 471
 472 static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value)
 473 {
 474         struct ipvl_dev *ipvlan = netdev_priv(dev);
 475
 476         ipvlan->msg_enable = value;
 477 }
 478
 479 static const struct ethtool_ops ipvlan_ethtool_ops = {
 480         .get_link       = ethtool_op_get_link,
 481         .get_link_ksettings     = ipvlan_ethtool_get_link_ksettings,
 482         .get_drvinfo    = ipvlan_ethtool_get_drvinfo,
 483         .get_msglevel   = ipvlan_ethtool_get_msglevel,
 484         .set_msglevel   = ipvlan_ethtool_set_msglevel,
 485 };
 486
 487 static int ipvlan_nl_changelink(struct net_device *dev,
 488                                 struct nlattr *tb[], struct nlattr *data[],
 489                                 struct netlink_ext_ack *extack)
 490 {
 491         struct ipvl_dev *ipvlan = netdev_priv(dev);
 492         struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
 493         int err = 0;
 494
 495         if (!data)
 496                 return 0;
 497
 498         if (data[IFLA_IPVLAN_MODE]) {
 499                 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
 500
 501                 err = ipvlan_set_port_mode(port, nmode);
 502         }
 503
 504         if (!err && data[IFLA_IPVLAN_FLAGS]) {
 505                 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
 506
 507                 if (flags & IPVLAN_F_PRIVATE)
 508                         ipvlan_mark_private(port);
 509                 else
 510                         ipvlan_clear_private(port);
 511
 512                 if (flags & IPVLAN_F_VEPA)
 513                         ipvlan_mark_vepa(port);
 514                 else
 515                         ipvlan_clear_vepa(port);
 516         }
 517
 518         return err;
 519 }
 520
 521 static size_t ipvlan_nl_getsize(const struct net_device *dev)
 522 {
 523         return (0
 524                 + nla_total_size(2) /* IFLA_IPVLAN_MODE */
 525                 + nla_total_size(2) /* IFLA_IPVLAN_FLAGS */
 526                 );
 527 }
 528
 529 static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[],
 530                               struct netlink_ext_ack *extack)
 531 {
 532         if (!data)
 533                 return 0;
 534
 535         if (data[IFLA_IPVLAN_MODE]) {
 536                 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
 537
 538                 if (mode < IPVLAN_MODE_L2 || mode >= IPVLAN_MODE_MAX)
 539                         return -EINVAL;
 540         }
 541         if (data[IFLA_IPVLAN_FLAGS]) {
 542                 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
 543
 544                 /* Only two bits are used at this moment. */
 545                 if (flags & ~(IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
 546                         return -EINVAL;
 547                 /* Also both flags can't be active at the same time. */
 548                 if ((flags & (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) ==
 549                     (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
 550                         return -EINVAL;
 551         }
 552
 553         return 0;
 554 }
 555
 556 static int ipvlan_nl_fillinfo(struct sk_buff *skb,
 557                               const struct net_device *dev)
 558 {
 559         struct ipvl_dev *ipvlan = netdev_priv(dev);
 560         struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
 561         int ret = -EINVAL;
 562
 563         if (!port)
 564                 goto err;
 565
 566         ret = -EMSGSIZE;
 567         if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode))
 568                 goto err;
 569         if (nla_put_u16(skb, IFLA_IPVLAN_FLAGS, port->flags))
 570                 goto err;
 571
 572         return 0;
 573
 574 err:
 575         return ret;
 576 }
 577
 578 int ipvlan_link_new(struct net *src_net, struct net_device *dev,
 579                     struct nlattr *tb[], struct nlattr *data[],
 580                     struct netlink_ext_ack *extack)
 581 {
 582         struct ipvl_dev *ipvlan = netdev_priv(dev);
 583         struct ipvl_port *port;
 584         struct net_device *phy_dev;
 585         int err;
 586         u16 mode = IPVLAN_MODE_L3;
 587
 588         if (!tb[IFLA_LINK])
 589                 return -EINVAL;
 590
 591         phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
 592         if (!phy_dev)
 593                 return -ENODEV;
 594
 595         if (netif_is_ipvlan(phy_dev)) {
 596                 struct ipvl_dev *tmp = netdev_priv(phy_dev);
 597
 598                 phy_dev = tmp->phy_dev;
 599         } else if (!netif_is_ipvlan_port(phy_dev)) {
 600                 /* Exit early if the underlying link is invalid or busy */
 601                 if (phy_dev->type != ARPHRD_ETHER ||
 602                     phy_dev->flags & IFF_LOOPBACK) {
 603                         netdev_err(phy_dev,
 604                                    "Master is either lo or non-ether device\n");
 605                         return -EINVAL;
 606                 }
 607
 608                 if (netdev_is_rx_handler_busy(phy_dev)) {
 609                         netdev_err(phy_dev, "Device is already in use.\n");
 610                         return -EBUSY;
 611                 }
 612         }
 613
 614         ipvlan->phy_dev = phy_dev;
 615         ipvlan->dev = dev;
 616         ipvlan->sfeatures = IPVLAN_FEATURES;
 617         if (!tb[IFLA_MTU])
 618                 ipvlan_adjust_mtu(ipvlan, phy_dev);
 619         INIT_LIST_HEAD(&ipvlan->addrs);
 620         spin_lock_init(&ipvlan->addrs_lock);
 621
 622         /* TODO Probably put random address here to be presented to the
 623          * world but keep using the physical-dev address for the outgoing
 624          * packets.
 625          */
 626         memcpy(dev->dev_addr, phy_dev->dev_addr, ETH_ALEN);
 627
 628         dev->priv_flags |= IFF_NO_RX_HANDLER;
 629
 630         err = register_netdevice(dev);
 631         if (err < 0)
 632                 return err;
 633
 634         /* ipvlan_init() would have created the port, if required */
 635         port = ipvlan_port_get_rtnl(phy_dev);
 636         ipvlan->port = port;
 637
 638         /* If the port-id base is at the MAX value, then wrap it around and
 639          * begin from 0x1 again. This may be due to a busy system where lots
 640          * of slaves are getting created and deleted.
 641          */
 642         if (port->dev_id_start == 0xFFFE)
 643                 port->dev_id_start = 0x1;
 644
 645         /* Since L2 address is shared among all IPvlan slaves including
 646          * master, use unique 16 bit dev-ids to diffentiate among them.
 647          * Assign IDs between 0x1 and 0xFFFE (used by the master) to each
 648          * slave link [see addrconf_ifid_eui48()].
 649          */
 650         err = ida_simple_get(&port->ida, port->dev_id_start, 0xFFFE,
 651                              GFP_KERNEL);
 652         if (err < 0)
 653                 err = ida_simple_get(&port->ida, 0x1, port->dev_id_start,
 654                                      GFP_KERNEL);
 655         if (err < 0)
 656                 goto unregister_netdev;
 657         dev->dev_id = err;
 658
 659         /* Increment id-base to the next slot for the future assignment */
 660         port->dev_id_start = err + 1;
 661
 662         err = netdev_upper_dev_link(phy_dev, dev, extack);
 663         if (err)
 664                 goto remove_ida;
 665
 666         /* Flags are per port and latest update overrides. User has
 667          * to be consistent in setting it just like the mode attribute.
 668          */
 669         if (data && data[IFLA_IPVLAN_FLAGS])
 670                 port->flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
 671
 672         if (data && data[IFLA_IPVLAN_MODE])
 673                 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
 674
 675         err = ipvlan_set_port_mode(port, mode);
 676         if (err)
 677                 goto unlink_netdev;
 678
 679         list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans);
 680         netif_stacked_transfer_operstate(phy_dev, dev);
 681         return 0;
 682
 683 unlink_netdev:
 684         netdev_upper_dev_unlink(phy_dev, dev);
 685 remove_ida:
 686         ida_simple_remove(&port->ida, dev->dev_id);
 687 unregister_netdev:
 688         unregister_netdevice(dev);
 689         return err;
 690 }
 691 EXPORT_SYMBOL_GPL(ipvlan_link_new);
 692
 693 void ipvlan_link_delete(struct net_device *dev, struct list_head *head)
 694 {
 695         struct ipvl_dev *ipvlan = netdev_priv(dev);
 696         struct ipvl_addr *addr, *next;
 697
 698         spin_lock_bh(&ipvlan->addrs_lock);
 699         list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) {
 700                 ipvlan_ht_addr_del(addr);
 701                 list_del_rcu(&addr->anode);
 702                 kfree_rcu(addr, rcu);
 703         }
 704         spin_unlock_bh(&ipvlan->addrs_lock);
 705
 706         ida_simple_remove(&ipvlan->port->ida, dev->dev_id);
 707         list_del_rcu(&ipvlan->pnode);
 708         unregister_netdevice_queue(dev, head);
 709         netdev_upper_dev_unlink(ipvlan->phy_dev, dev);
 710 }
 711 EXPORT_SYMBOL_GPL(ipvlan_link_delete);
 712
 713 void ipvlan_link_setup(struct net_device *dev)
 714 {
 715         ether_setup(dev);
 716
 717         dev->max_mtu = ETH_MAX_MTU;
 718         dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
 719         dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE;
 720         dev->netdev_ops = &ipvlan_netdev_ops;
 721         dev->needs_free_netdev = true;
 722         dev->header_ops = &ipvlan_header_ops;
 723         dev->ethtool_ops = &ipvlan_ethtool_ops;
 724 }
 725 EXPORT_SYMBOL_GPL(ipvlan_link_setup);
 726
 727 static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] =
 728 {
 729         [IFLA_IPVLAN_MODE] = { .type = NLA_U16 },
 730         [IFLA_IPVLAN_FLAGS] = { .type = NLA_U16 },
 731 };
 732
 733 static struct rtnl_link_ops ipvlan_link_ops = {
 734         .kind           = "ipvlan",
 735         .priv_size      = sizeof(struct ipvl_dev),
 736
 737         .setup          = ipvlan_link_setup,
 738         .newlink        = ipvlan_link_new,
 739         .dellink        = ipvlan_link_delete,
 740 };
 741
 742 int ipvlan_link_register(struct rtnl_link_ops *ops)
 743 {
 744         ops->get_size   = ipvlan_nl_getsize;
 745         ops->policy     = ipvlan_nl_policy;
 746         ops->validate   = ipvlan_nl_validate;
 747         ops->fill_info  = ipvlan_nl_fillinfo;
 748         ops->changelink = ipvlan_nl_changelink;
 749         ops->maxtype    = IFLA_IPVLAN_MAX;
 750         return rtnl_link_register(ops);
 751 }
 752 EXPORT_SYMBOL_GPL(ipvlan_link_register);
 753
 754 static int ipvlan_device_event(struct notifier_block *unused,
 755                                unsigned long event, void *ptr)
 756 {
 757         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 758         struct ipvl_dev *ipvlan, *next;
 759         struct ipvl_port *port;
 760         LIST_HEAD(lst_kill);
 761
 762         if (!netif_is_ipvlan_port(dev))
 763                 return NOTIFY_DONE;
 764
 765         port = ipvlan_port_get_rtnl(dev);
 766
 767         switch (event) {
 768         case NETDEV_CHANGE:
 769                 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
 770                         netif_stacked_transfer_operstate(ipvlan->phy_dev,
 771                                                          ipvlan->dev);
 772                 break;
 773
 774         case NETDEV_REGISTER: {
 775                 struct net *oldnet, *newnet = dev_net(dev);
 776                 struct ipvlan_netns *old_vnet;
 777
 778                 oldnet = read_pnet(&port->pnet);
 779                 if (net_eq(newnet, oldnet))
 780                         break;
 781
 782                 write_pnet(&port->pnet, newnet);
 783
 784                 old_vnet = net_generic(oldnet, ipvlan_netid);
 785                 if (!old_vnet->ipvl_nf_hook_refcnt)
 786                         break;
 787
 788                 ipvlan_register_nf_hook(newnet);
 789                 ipvlan_unregister_nf_hook(oldnet);
 790                 break;
 791         }
 792         case NETDEV_UNREGISTER:
 793                 if (dev->reg_state != NETREG_UNREGISTERING)
 794                         break;
 795
 796                 list_for_each_entry_safe(ipvlan, next, &port->ipvlans, pnode)
 797                         ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev,
 798                                                             &lst_kill);
 799                 unregister_netdevice_many(&lst_kill);
 800                 break;
 801
 802         case NETDEV_FEAT_CHANGE:
 803                 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
 804                         ipvlan->dev->features = dev->features & IPVLAN_FEATURES;
 805                         ipvlan->dev->gso_max_size = dev->gso_max_size;
 806                         ipvlan->dev->gso_max_segs = dev->gso_max_segs;
 807                         netdev_features_change(ipvlan->dev);
 808                 }
 809                 break;
 810
 811         case NETDEV_CHANGEMTU:
 812                 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
 813                         ipvlan_adjust_mtu(ipvlan, dev);
 814                 break;
 815
 816         case NETDEV_CHANGEADDR:
 817                 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
 818                         ether_addr_copy(ipvlan->dev->dev_addr, dev->dev_addr);
 819                         call_netdevice_notifiers(NETDEV_CHANGEADDR, ipvlan->dev);
 820                 }
 821                 break;
 822
 823         case NETDEV_PRE_TYPE_CHANGE:
 824                 /* Forbid underlying device to change its type. */
 825                 return NOTIFY_BAD;
 826         }
 827         return NOTIFY_DONE;
 828 }
 829
 830 /* the caller must held the addrs lock */
 831 static int ipvlan_add_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
 832 {
 833         struct ipvl_addr *addr;
 834
 835         addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC);
 836         if (!addr)
 837                 return -ENOMEM;
 838
 839         addr->master = ipvlan;
 840         if (!is_v6) {
 841                 memcpy(&addr->ip4addr, iaddr, sizeof(struct in_addr));
 842                 addr->atype = IPVL_IPV4;
 843 #if IS_ENABLED(CONFIG_IPV6)
 844         } else {
 845                 memcpy(&addr->ip6addr, iaddr, sizeof(struct in6_addr));
 846                 addr->atype = IPVL_IPV6;
 847 #endif
 848         }
 849
 850         list_add_tail_rcu(&addr->anode, &ipvlan->addrs);
 851
 852         /* If the interface is not up, the address will be added to the hash
 853          * list by ipvlan_open.
 854          */
 855         if (netif_running(ipvlan->dev))
 856                 ipvlan_ht_addr_add(ipvlan, addr);
 857
 858         return 0;
 859 }
 860
 861 static void ipvlan_del_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
 862 {
 863         struct ipvl_addr *addr;
 864
 865         spin_lock_bh(&ipvlan->addrs_lock);
 866         addr = ipvlan_find_addr(ipvlan, iaddr, is_v6);
 867         if (!addr) {
 868                 spin_unlock_bh(&ipvlan->addrs_lock);
 869                 return;
 870         }
 871
 872         ipvlan_ht_addr_del(addr);
 873         list_del_rcu(&addr->anode);
 874         spin_unlock_bh(&ipvlan->addrs_lock);
 875         kfree_rcu(addr, rcu);
 876 }
 877
 878 static bool ipvlan_is_valid_dev(const struct net_device *dev)
 879 {
 880         struct ipvl_dev *ipvlan = netdev_priv(dev);
 881
 882         if (!netif_is_ipvlan(dev))
 883                 return false;
 884
 885         if (!ipvlan || !ipvlan->port)
 886                 return false;
 887
 888         return true;
 889 }
 890
 891 #if IS_ENABLED(CONFIG_IPV6)
 892 static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
 893 {
 894         int ret = -EINVAL;
 895
 896         spin_lock_bh(&ipvlan->addrs_lock);
 897         if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true))
 898                 netif_err(ipvlan, ifup, ipvlan->dev,
 899                           "Failed to add IPv6=%pI6c addr for %s intf\n",
 900                           ip6_addr, ipvlan->dev->name);
 901         else
 902                 ret = ipvlan_add_addr(ipvlan, ip6_addr, true);
 903         spin_unlock_bh(&ipvlan->addrs_lock);
 904         return ret;
 905 }
 906
 907 static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
 908 {
 909         return ipvlan_del_addr(ipvlan, ip6_addr, true);
 910 }
 911
 912 static int ipvlan_addr6_event(struct notifier_block *unused,
 913                               unsigned long event, void *ptr)
 914 {
 915         struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr;
 916         struct net_device *dev = (struct net_device *)if6->idev->dev;
 917         struct ipvl_dev *ipvlan = netdev_priv(dev);
 918
 919         if (!ipvlan_is_valid_dev(dev))
 920                 return NOTIFY_DONE;
 921
 922         switch (event) {
 923         case NETDEV_UP:
 924                 if (ipvlan_add_addr6(ipvlan, &if6->addr))
 925                         return NOTIFY_BAD;
 926                 break;
 927
 928         case NETDEV_DOWN:
 929                 ipvlan_del_addr6(ipvlan, &if6->addr);
 930                 break;
 931         }
 932
 933         return NOTIFY_OK;
 934 }
 935
 936 static int ipvlan_addr6_validator_event(struct notifier_block *unused,
 937                                         unsigned long event, void *ptr)
 938 {
 939         struct in6_validator_info *i6vi = (struct in6_validator_info *)ptr;
 940         struct net_device *dev = (struct net_device *)i6vi->i6vi_dev->dev;
 941         struct ipvl_dev *ipvlan = netdev_priv(dev);
 942
 943         if (!ipvlan_is_valid_dev(dev))
 944                 return NOTIFY_DONE;
 945
 946         switch (event) {
 947         case NETDEV_UP:
 948                 if (ipvlan_addr_busy(ipvlan->port, &i6vi->i6vi_addr, true)) {
 949                         NL_SET_ERR_MSG(i6vi->extack,
 950                                        "Address already assigned to an ipvlan device");
 951                         return notifier_from_errno(-EADDRINUSE);
 952                 }
 953                 break;
 954         }
 955
 956         return NOTIFY_OK;
 957 }
 958 #endif
 959
 960 static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
 961 {
 962         int ret = -EINVAL;
 963
 964         spin_lock_bh(&ipvlan->addrs_lock);
 965         if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false))
 966                 netif_err(ipvlan, ifup, ipvlan->dev,
 967                           "Failed to add IPv4=%pI4 on %s intf.\n",
 968                           ip4_addr, ipvlan->dev->name);
 969         else
 970                 ret = ipvlan_add_addr(ipvlan, ip4_addr, false);
 971         spin_unlock_bh(&ipvlan->addrs_lock);
 972         return ret;
 973 }
 974
 975 static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
 976 {
 977         return ipvlan_del_addr(ipvlan, ip4_addr, false);
 978 }
 979
 980 static int ipvlan_addr4_event(struct notifier_block *unused,
 981                               unsigned long event, void *ptr)
 982 {
 983         struct in_ifaddr *if4 = (struct in_ifaddr *)ptr;
 984         struct net_device *dev = (struct net_device *)if4->ifa_dev->dev;
 985         struct ipvl_dev *ipvlan = netdev_priv(dev);
 986         struct in_addr ip4_addr;
 987
 988         if (!ipvlan_is_valid_dev(dev))
 989                 return NOTIFY_DONE;
 990
 991         switch (event) {
 992         case NETDEV_UP:
 993                 ip4_addr.s_addr = if4->ifa_address;
 994                 if (ipvlan_add_addr4(ipvlan, &ip4_addr))
 995                         return NOTIFY_BAD;
 996                 break;
 997
 998         case NETDEV_DOWN:
 999                 ip4_addr.s_addr = if4->ifa_address;
1000                 ipvlan_del_addr4(ipvlan, &ip4_addr);
1001                 break;
1002         }
1003
1004         return NOTIFY_OK;
1005 }
1006
1007 static int ipvlan_addr4_validator_event(struct notifier_block *unused,
1008                                         unsigned long event, void *ptr)
1009 {
1010         struct in_validator_info *ivi = (struct in_validator_info *)ptr;
1011         struct net_device *dev = (struct net_device *)ivi->ivi_dev->dev;
1012         struct ipvl_dev *ipvlan = netdev_priv(dev);
1013
1014         if (!ipvlan_is_valid_dev(dev))
1015                 return NOTIFY_DONE;
1016
1017         switch (event) {
1018         case NETDEV_UP:
1019                 if (ipvlan_addr_busy(ipvlan->port, &ivi->ivi_addr, false)) {
1020                         NL_SET_ERR_MSG(ivi->extack,
1021                                        "Address already assigned to an ipvlan device");
1022                         return notifier_from_errno(-EADDRINUSE);
1023                 }
1024                 break;
1025         }
1026
1027         return NOTIFY_OK;
1028 }
1029
1030 static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = {
1031         .notifier_call = ipvlan_addr4_event,
1032 };
1033
1034 static struct notifier_block ipvlan_addr4_vtor_notifier_block __read_mostly = {
1035         .notifier_call = ipvlan_addr4_validator_event,
1036 };
1037
1038 static struct notifier_block ipvlan_notifier_block __read_mostly = {
1039         .notifier_call = ipvlan_device_event,
1040 };
1041
1042 #if IS_ENABLED(CONFIG_IPV6)
1043 static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = {
1044         .notifier_call = ipvlan_addr6_event,
1045 };
1046
1047 static struct notifier_block ipvlan_addr6_vtor_notifier_block __read_mostly = {
1048         .notifier_call = ipvlan_addr6_validator_event,
1049 };
1050 #endif
1051
1052 static void ipvlan_ns_exit(struct net *net)
1053 {
1054         struct ipvlan_netns *vnet = net_generic(net, ipvlan_netid);
1055
1056         if (WARN_ON_ONCE(vnet->ipvl_nf_hook_refcnt)) {
1057                 vnet->ipvl_nf_hook_refcnt = 0;
1058                 nf_unregister_net_hooks(net, ipvl_nfops,
1059                                         ARRAY_SIZE(ipvl_nfops));
1060         }
1061 }
1062
1063 static struct pernet_operations ipvlan_net_ops = {
1064         .id = &ipvlan_netid,
1065         .size = sizeof(struct ipvlan_netns),
1066         .exit = ipvlan_ns_exit,
1067 };
1068
1069 static int __init ipvlan_init_module(void)
1070 {
1071         int err;
1072
1073         ipvlan_init_secret();
1074         register_netdevice_notifier(&ipvlan_notifier_block);
1075 #if IS_ENABLED(CONFIG_IPV6)
1076         register_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1077         register_inet6addr_validator_notifier(
1078             &ipvlan_addr6_vtor_notifier_block);
1079 #endif
1080         register_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1081         register_inetaddr_validator_notifier(&ipvlan_addr4_vtor_notifier_block);
1082
1083         err = register_pernet_subsys(&ipvlan_net_ops);
1084         if (err < 0)
1085                 goto error;
1086
1087         err = ipvlan_link_register(&ipvlan_link_ops);
1088         if (err < 0) {
1089                 unregister_pernet_subsys(&ipvlan_net_ops);
1090                 goto error;
1091         }
1092
1093         return 0;
1094 error:
1095         unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1096         unregister_inetaddr_validator_notifier(
1097             &ipvlan_addr4_vtor_notifier_block);
1098 #if IS_ENABLED(CONFIG_IPV6)
1099         unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1100         unregister_inet6addr_validator_notifier(
1101             &ipvlan_addr6_vtor_notifier_block);
1102 #endif
1103         unregister_netdevice_notifier(&ipvlan_notifier_block);
1104         return err;
1105 }
1106
1107 static void __exit ipvlan_cleanup_module(void)
1108 {
1109         rtnl_link_unregister(&ipvlan_link_ops);
1110         unregister_pernet_subsys(&ipvlan_net_ops);
1111         unregister_netdevice_notifier(&ipvlan_notifier_block);
1112         unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1113         unregister_inetaddr_validator_notifier(
1114             &ipvlan_addr4_vtor_notifier_block);
1115 #if IS_ENABLED(CONFIG_IPV6)
1116         unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1117         unregister_inet6addr_validator_notifier(
1118             &ipvlan_addr6_vtor_notifier_block);
1119 #endif
1120 }
1121
1122 module_init(ipvlan_init_module);
1123 module_exit(ipvlan_cleanup_module);
1124
1125 MODULE_LICENSE("GPL");
1126 MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>");
1127 MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs");
1128 MODULE_ALIAS_RTNL_LINK("ipvlan");