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 struct nf_hook_ops ipvl_nfops[] __read_mostly = {
  19         {
  20                 .hook     = ipvlan_nf_input,
  21                 .pf       = NFPROTO_IPV4,
  22                 .hooknum  = NF_INET_LOCAL_IN,
  23                 .priority = INT_MAX,
  24         },
  25         {
  26                 .hook     = ipvlan_nf_input,
  27                 .pf       = NFPROTO_IPV6,
  28                 .hooknum  = NF_INET_LOCAL_IN,
  29                 .priority = INT_MAX,
  30         },
  31 };
  32
  33 static const struct l3mdev_ops ipvl_l3mdev_ops = {
  34         .l3mdev_l3_rcv = ipvlan_l3_rcv,
  35 };
  36
  37 static void ipvlan_adjust_mtu(struct ipvl_dev *ipvlan, struct net_device *dev)
  38 {
  39         ipvlan->dev->mtu = dev->mtu;
  40 }
  41
  42 static int ipvlan_register_nf_hook(struct net *net)
  43 {
  44         struct ipvlan_netns *vnet = net_generic(net, ipvlan_netid);
  45         int err = 0;
  46
  47         if (!vnet->ipvl_nf_hook_refcnt) {
  48                 err = nf_register_net_hooks(net, ipvl_nfops,
  49                                             ARRAY_SIZE(ipvl_nfops));
  50                 if (!err)
  51                         vnet->ipvl_nf_hook_refcnt = 1;
  52         } else {
  53                 vnet->ipvl_nf_hook_refcnt++;
  54         }
  55
  56         return err;
  57 }
  58
  59 static void ipvlan_unregister_nf_hook(struct net *net)
  60 {
  61         struct ipvlan_netns *vnet = net_generic(net, ipvlan_netid);
  62
  63         if (WARN_ON(!vnet->ipvl_nf_hook_refcnt))
  64                 return;
  65
  66         vnet->ipvl_nf_hook_refcnt--;
  67         if (!vnet->ipvl_nf_hook_refcnt)
  68                 nf_unregister_net_hooks(net, ipvl_nfops,
  69                                         ARRAY_SIZE(ipvl_nfops));
  70 }
  71
  72 static int ipvlan_set_port_mode(struct ipvl_port *port, u16 nval)
  73 {
  74         struct ipvl_dev *ipvlan;
  75         struct net_device *mdev = port->dev;
  76         int err = 0;
  77
  78         ASSERT_RTNL();
  79         if (port->mode != nval) {
  80                 if (nval == IPVLAN_MODE_L3S) {
  81                         /* New mode is L3S */
  82                         err = ipvlan_register_nf_hook(read_pnet(&port->pnet));
  83                         if (!err) {
  84                                 mdev->l3mdev_ops = &ipvl_l3mdev_ops;
  85                                 mdev->priv_flags |= IFF_L3MDEV_MASTER;
  86                         } else
  87                                 return err;
  88                 } else if (port->mode == IPVLAN_MODE_L3S) {
  89                         /* Old mode was L3S */
  90                         mdev->priv_flags &= ~IFF_L3MDEV_MASTER;
  91                         ipvlan_unregister_nf_hook(read_pnet(&port->pnet));
  92                         mdev->l3mdev_ops = NULL;
  93                 }
  94                 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
  95                         if (nval == IPVLAN_MODE_L3 || nval == IPVLAN_MODE_L3S)
  96                                 ipvlan->dev->flags |= IFF_NOARP;
  97                         else
  98                                 ipvlan->dev->flags &= ~IFF_NOARP;
  99                 }
 100                 port->mode = nval;
 101         }
 102         return err;
 103 }
 104
 105 static int ipvlan_port_create(struct net_device *dev)
 106 {
 107         struct ipvl_port *port;
 108         int err, idx;
 109
 110         if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) {
 111                 netdev_err(dev, "Master is either lo or non-ether device\n");
 112                 return -EINVAL;
 113         }
 114
 115         if (netdev_is_rx_handler_busy(dev)) {
 116                 netdev_err(dev, "Device is already in use.\n");
 117                 return -EBUSY;
 118         }
 119
 120         port = kzalloc(sizeof(struct ipvl_port), GFP_KERNEL);
 121         if (!port)
 122                 return -ENOMEM;
 123
 124         write_pnet(&port->pnet, dev_net(dev));
 125         port->dev = dev;
 126         port->mode = IPVLAN_MODE_L3;
 127         INIT_LIST_HEAD(&port->ipvlans);
 128         for (idx = 0; idx < IPVLAN_HASH_SIZE; idx++)
 129                 INIT_HLIST_HEAD(&port->hlhead[idx]);
 130
 131         skb_queue_head_init(&port->backlog);
 132         INIT_WORK(&port->wq, ipvlan_process_multicast);
 133         ida_init(&port->ida);
 134         port->dev_id_start = 1;
 135
 136         err = netdev_rx_handler_register(dev, ipvlan_handle_frame, port);
 137         if (err)
 138                 goto err;
 139
 140         dev->priv_flags |= IFF_IPVLAN_MASTER;
 141         return 0;
 142
 143 err:
 144         kfree(port);
 145         return err;
 146 }
 147
 148 static void ipvlan_port_destroy(struct net_device *dev)
 149 {
 150         struct ipvl_port *port = ipvlan_port_get_rtnl(dev);
 151         struct sk_buff *skb;
 152
 153         dev->priv_flags &= ~IFF_IPVLAN_MASTER;
 154         if (port->mode == IPVLAN_MODE_L3S) {
 155                 dev->priv_flags &= ~IFF_L3MDEV_MASTER;
 156                 ipvlan_unregister_nf_hook(dev_net(dev));
 157                 dev->l3mdev_ops = NULL;
 158         }
 159         netdev_rx_handler_unregister(dev);
 160         cancel_work_sync(&port->wq);
 161         while ((skb = __skb_dequeue(&port->backlog)) != NULL) {
 162                 if (skb->dev)
 163                         dev_put(skb->dev);
 164                 kfree_skb(skb);
 165         }
 166         ida_destroy(&port->ida);
 167         kfree(port);
 168 }
 169
 170 #define IPVLAN_FEATURES \
 171         (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
 172          NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
 173          NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
 174          NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
 175
 176 #define IPVLAN_STATE_MASK \
 177         ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
 178
 179 static int ipvlan_init(struct net_device *dev)
 180 {
 181         struct ipvl_dev *ipvlan = netdev_priv(dev);
 182         const struct net_device *phy_dev = ipvlan->phy_dev;
 183         struct ipvl_port *port = ipvlan->port;
 184
 185         dev->state = (dev->state & ~IPVLAN_STATE_MASK) |
 186                      (phy_dev->state & IPVLAN_STATE_MASK);
 187         dev->features = phy_dev->features & IPVLAN_FEATURES;
 188         dev->features |= NETIF_F_LLTX;
 189         dev->gso_max_size = phy_dev->gso_max_size;
 190         dev->gso_max_segs = phy_dev->gso_max_segs;
 191         dev->hard_header_len = phy_dev->hard_header_len;
 192
 193         netdev_lockdep_set_classes(dev);
 194
 195         ipvlan->pcpu_stats = netdev_alloc_pcpu_stats(struct ipvl_pcpu_stats);
 196         if (!ipvlan->pcpu_stats)
 197                 return -ENOMEM;
 198
 199         port->count += 1;
 200
 201         return 0;
 202 }
 203
 204 static void ipvlan_uninit(struct net_device *dev)
 205 {
 206         struct ipvl_dev *ipvlan = netdev_priv(dev);
 207         struct ipvl_port *port = ipvlan->port;
 208
 209         free_percpu(ipvlan->pcpu_stats);
 210
 211         port->count -= 1;
 212         if (!port->count)
 213                 ipvlan_port_destroy(port->dev);
 214 }
 215
 216 static int ipvlan_open(struct net_device *dev)
 217 {
 218         struct ipvl_dev *ipvlan = netdev_priv(dev);
 219         struct net_device *phy_dev = ipvlan->phy_dev;
 220         struct ipvl_addr *addr;
 221
 222         if (ipvlan->port->mode == IPVLAN_MODE_L3 ||
 223             ipvlan->port->mode == IPVLAN_MODE_L3S)
 224                 dev->flags |= IFF_NOARP;
 225         else
 226                 dev->flags &= ~IFF_NOARP;
 227
 228         list_for_each_entry(addr, &ipvlan->addrs, anode)
 229                 ipvlan_ht_addr_add(ipvlan, addr);
 230
 231         return dev_uc_add(phy_dev, phy_dev->dev_addr);
 232 }
 233
 234 static int ipvlan_stop(struct net_device *dev)
 235 {
 236         struct ipvl_dev *ipvlan = netdev_priv(dev);
 237         struct net_device *phy_dev = ipvlan->phy_dev;
 238         struct ipvl_addr *addr;
 239
 240         dev_uc_unsync(phy_dev, dev);
 241         dev_mc_unsync(phy_dev, dev);
 242
 243         dev_uc_del(phy_dev, phy_dev->dev_addr);
 244
 245         list_for_each_entry(addr, &ipvlan->addrs, anode)
 246                 ipvlan_ht_addr_del(addr);
 247
 248         return 0;
 249 }
 250
 251 static netdev_tx_t ipvlan_start_xmit(struct sk_buff *skb,
 252                                      struct net_device *dev)
 253 {
 254         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 255         int skblen = skb->len;
 256         int ret;
 257
 258         ret = ipvlan_queue_xmit(skb, dev);
 259         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 260                 struct ipvl_pcpu_stats *pcptr;
 261
 262                 pcptr = this_cpu_ptr(ipvlan->pcpu_stats);
 263
 264                 u64_stats_update_begin(&pcptr->syncp);
 265                 pcptr->tx_pkts++;
 266                 pcptr->tx_bytes += skblen;
 267                 u64_stats_update_end(&pcptr->syncp);
 268         } else {
 269                 this_cpu_inc(ipvlan->pcpu_stats->tx_drps);
 270         }
 271         return ret;
 272 }
 273
 274 static netdev_features_t ipvlan_fix_features(struct net_device *dev,
 275                                              netdev_features_t features)
 276 {
 277         struct ipvl_dev *ipvlan = netdev_priv(dev);
 278
 279         return features & (ipvlan->sfeatures | ~IPVLAN_FEATURES);
 280 }
 281
 282 static void ipvlan_change_rx_flags(struct net_device *dev, int change)
 283 {
 284         struct ipvl_dev *ipvlan = netdev_priv(dev);
 285         struct net_device *phy_dev = ipvlan->phy_dev;
 286
 287         if (change & IFF_ALLMULTI)
 288                 dev_set_allmulti(phy_dev, dev->flags & IFF_ALLMULTI? 1 : -1);
 289 }
 290
 291 static void ipvlan_set_multicast_mac_filter(struct net_device *dev)
 292 {
 293         struct ipvl_dev *ipvlan = netdev_priv(dev);
 294
 295         if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
 296                 bitmap_fill(ipvlan->mac_filters, IPVLAN_MAC_FILTER_SIZE);
 297         } else {
 298                 struct netdev_hw_addr *ha;
 299                 DECLARE_BITMAP(mc_filters, IPVLAN_MAC_FILTER_SIZE);
 300
 301                 bitmap_zero(mc_filters, IPVLAN_MAC_FILTER_SIZE);
 302                 netdev_for_each_mc_addr(ha, dev)
 303                         __set_bit(ipvlan_mac_hash(ha->addr), mc_filters);
 304
 305                 /* Turn-on broadcast bit irrespective of address family,
 306                  * since broadcast is deferred to a work-queue, hence no
 307                  * impact on fast-path processing.
 308                  */
 309                 __set_bit(ipvlan_mac_hash(dev->broadcast), mc_filters);
 310
 311                 bitmap_copy(ipvlan->mac_filters, mc_filters,
 312                             IPVLAN_MAC_FILTER_SIZE);
 313         }
 314         dev_uc_sync(ipvlan->phy_dev, dev);
 315         dev_mc_sync(ipvlan->phy_dev, dev);
 316 }
 317
 318 static void ipvlan_get_stats64(struct net_device *dev,
 319                                struct rtnl_link_stats64 *s)
 320 {
 321         struct ipvl_dev *ipvlan = netdev_priv(dev);
 322
 323         if (ipvlan->pcpu_stats) {
 324                 struct ipvl_pcpu_stats *pcptr;
 325                 u64 rx_pkts, rx_bytes, rx_mcast, tx_pkts, tx_bytes;
 326                 u32 rx_errs = 0, tx_drps = 0;
 327                 u32 strt;
 328                 int idx;
 329
 330                 for_each_possible_cpu(idx) {
 331                         pcptr = per_cpu_ptr(ipvlan->pcpu_stats, idx);
 332                         do {
 333                                 strt= u64_stats_fetch_begin_irq(&pcptr->syncp);
 334                                 rx_pkts = pcptr->rx_pkts;
 335                                 rx_bytes = pcptr->rx_bytes;
 336                                 rx_mcast = pcptr->rx_mcast;
 337                                 tx_pkts = pcptr->tx_pkts;
 338                                 tx_bytes = pcptr->tx_bytes;
 339                         } while (u64_stats_fetch_retry_irq(&pcptr->syncp,
 340                                                            strt));
 341
 342                         s->rx_packets += rx_pkts;
 343                         s->rx_bytes += rx_bytes;
 344                         s->multicast += rx_mcast;
 345                         s->tx_packets += tx_pkts;
 346                         s->tx_bytes += tx_bytes;
 347
 348                         /* u32 values are updated without syncp protection. */
 349                         rx_errs += pcptr->rx_errs;
 350                         tx_drps += pcptr->tx_drps;
 351                 }
 352                 s->rx_errors = rx_errs;
 353                 s->rx_dropped = rx_errs;
 354                 s->tx_dropped = tx_drps;
 355         }
 356 }
 357
 358 static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid)
 359 {
 360         struct ipvl_dev *ipvlan = netdev_priv(dev);
 361         struct net_device *phy_dev = ipvlan->phy_dev;
 362
 363         return vlan_vid_add(phy_dev, proto, vid);
 364 }
 365
 366 static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
 367                                    u16 vid)
 368 {
 369         struct ipvl_dev *ipvlan = netdev_priv(dev);
 370         struct net_device *phy_dev = ipvlan->phy_dev;
 371
 372         vlan_vid_del(phy_dev, proto, vid);
 373         return 0;
 374 }
 375
 376 static int ipvlan_get_iflink(const struct net_device *dev)
 377 {
 378         struct ipvl_dev *ipvlan = netdev_priv(dev);
 379
 380         return ipvlan->phy_dev->ifindex;
 381 }
 382
 383 static const struct net_device_ops ipvlan_netdev_ops = {
 384         .ndo_init               = ipvlan_init,
 385         .ndo_uninit             = ipvlan_uninit,
 386         .ndo_open               = ipvlan_open,
 387         .ndo_stop               = ipvlan_stop,
 388         .ndo_start_xmit         = ipvlan_start_xmit,
 389         .ndo_fix_features       = ipvlan_fix_features,
 390         .ndo_change_rx_flags    = ipvlan_change_rx_flags,
 391         .ndo_set_rx_mode        = ipvlan_set_multicast_mac_filter,
 392         .ndo_get_stats64        = ipvlan_get_stats64,
 393         .ndo_vlan_rx_add_vid    = ipvlan_vlan_rx_add_vid,
 394         .ndo_vlan_rx_kill_vid   = ipvlan_vlan_rx_kill_vid,
 395         .ndo_get_iflink         = ipvlan_get_iflink,
 396 };
 397
 398 static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
 399                               unsigned short type, const void *daddr,
 400                               const void *saddr, unsigned len)
 401 {
 402         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 403         struct net_device *phy_dev = ipvlan->phy_dev;
 404
 405         /* TODO Probably use a different field than dev_addr so that the
 406          * mac-address on the virtual device is portable and can be carried
 407          * while the packets use the mac-addr on the physical device.
 408          */
 409         return dev_hard_header(skb, phy_dev, type, daddr,
 410                                saddr ? : dev->dev_addr, len);
 411 }
 412
 413 static const struct header_ops ipvlan_header_ops = {
 414         .create         = ipvlan_hard_header,
 415         .parse          = eth_header_parse,
 416         .cache          = eth_header_cache,
 417         .cache_update   = eth_header_cache_update,
 418 };
 419
 420 static int ipvlan_ethtool_get_link_ksettings(struct net_device *dev,
 421                                              struct ethtool_link_ksettings *cmd)
 422 {
 423         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 424
 425         return __ethtool_get_link_ksettings(ipvlan->phy_dev, cmd);
 426 }
 427
 428 static void ipvlan_ethtool_get_drvinfo(struct net_device *dev,
 429                                        struct ethtool_drvinfo *drvinfo)
 430 {
 431         strlcpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver));
 432         strlcpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version));
 433 }
 434
 435 static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev)
 436 {
 437         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 438
 439         return ipvlan->msg_enable;
 440 }
 441
 442 static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value)
 443 {
 444         struct ipvl_dev *ipvlan = netdev_priv(dev);
 445
 446         ipvlan->msg_enable = value;
 447 }
 448
 449 static const struct ethtool_ops ipvlan_ethtool_ops = {
 450         .get_link       = ethtool_op_get_link,
 451         .get_link_ksettings     = ipvlan_ethtool_get_link_ksettings,
 452         .get_drvinfo    = ipvlan_ethtool_get_drvinfo,
 453         .get_msglevel   = ipvlan_ethtool_get_msglevel,
 454         .set_msglevel   = ipvlan_ethtool_set_msglevel,
 455 };
 456
 457 static int ipvlan_nl_changelink(struct net_device *dev,
 458                                 struct nlattr *tb[], struct nlattr *data[],
 459                                 struct netlink_ext_ack *extack)
 460 {
 461         struct ipvl_dev *ipvlan = netdev_priv(dev);
 462         struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
 463         int err = 0;
 464
 465         if (data && data[IFLA_IPVLAN_MODE]) {
 466                 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
 467
 468                 err = ipvlan_set_port_mode(port, nmode);
 469         }
 470         return err;
 471 }
 472
 473 static size_t ipvlan_nl_getsize(const struct net_device *dev)
 474 {
 475         return (0
 476                 + nla_total_size(2) /* IFLA_IPVLAN_MODE */
 477                 );
 478 }
 479
 480 static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[],
 481                               struct netlink_ext_ack *extack)
 482 {
 483         if (data && data[IFLA_IPVLAN_MODE]) {
 484                 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
 485
 486                 if (mode < IPVLAN_MODE_L2 || mode >= IPVLAN_MODE_MAX)
 487                         return -EINVAL;
 488         }
 489         return 0;
 490 }
 491
 492 static int ipvlan_nl_fillinfo(struct sk_buff *skb,
 493                               const struct net_device *dev)
 494 {
 495         struct ipvl_dev *ipvlan = netdev_priv(dev);
 496         struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
 497         int ret = -EINVAL;
 498
 499         if (!port)
 500                 goto err;
 501
 502         ret = -EMSGSIZE;
 503         if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode))
 504                 goto err;
 505
 506         return 0;
 507
 508 err:
 509         return ret;
 510 }
 511
 512 int ipvlan_link_new(struct net *src_net, struct net_device *dev,
 513                     struct nlattr *tb[], struct nlattr *data[],
 514                     struct netlink_ext_ack *extack)
 515 {
 516         struct ipvl_dev *ipvlan = netdev_priv(dev);
 517         struct ipvl_port *port;
 518         struct net_device *phy_dev;
 519         int err;
 520         u16 mode = IPVLAN_MODE_L3;
 521         bool create = false;
 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         } else if (!netif_is_ipvlan_port(phy_dev)) {
 535                 err = ipvlan_port_create(phy_dev);
 536                 if (err < 0)
 537                         return err;
 538                 create = true;
 539         }
 540
 541         if (data && data[IFLA_IPVLAN_MODE])
 542                 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
 543
 544         port = ipvlan_port_get_rtnl(phy_dev);
 545         ipvlan->phy_dev = phy_dev;
 546         ipvlan->dev = dev;
 547         ipvlan->port = port;
 548         ipvlan->sfeatures = IPVLAN_FEATURES;
 549         ipvlan_adjust_mtu(ipvlan, phy_dev);
 550         INIT_LIST_HEAD(&ipvlan->addrs);
 551
 552         /* If the port-id base is at the MAX value, then wrap it around and
 553          * begin from 0x1 again. This may be due to a busy system where lots
 554          * of slaves are getting created and deleted.
 555          */
 556         if (port->dev_id_start == 0xFFFE)
 557                 port->dev_id_start = 0x1;
 558
 559         /* Since L2 address is shared among all IPvlan slaves including
 560          * master, use unique 16 bit dev-ids to diffentiate among them.
 561          * Assign IDs between 0x1 and 0xFFFE (used by the master) to each
 562          * slave link [see addrconf_ifid_eui48()].
 563          */
 564         err = ida_simple_get(&port->ida, port->dev_id_start, 0xFFFE,
 565                              GFP_KERNEL);
 566         if (err < 0)
 567                 err = ida_simple_get(&port->ida, 0x1, port->dev_id_start,
 568                                      GFP_KERNEL);
 569         if (err < 0)
 570                 goto destroy_ipvlan_port;
 571         dev->dev_id = err;
 572         /* Increment id-base to the next slot for the future assignment */
 573         port->dev_id_start = err + 1;
 574
 575         /* TODO Probably put random address here to be presented to the
 576          * world but keep using the physical-dev address for the outgoing
 577          * packets.
 578          */
 579         memcpy(dev->dev_addr, phy_dev->dev_addr, ETH_ALEN);
 580
 581         dev->priv_flags |= IFF_IPVLAN_SLAVE;
 582
 583         err = register_netdevice(dev);
 584         if (err < 0)
 585                 goto remove_ida;
 586
 587         err = netdev_upper_dev_link(phy_dev, dev);
 588         if (err) {
 589                 goto unregister_netdev;
 590         }
 591         err = ipvlan_set_port_mode(port, mode);
 592         if (err) {
 593                 goto unlink_netdev;
 594         }
 595
 596         list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans);
 597         netif_stacked_transfer_operstate(phy_dev, dev);
 598         return 0;
 599
 600 unlink_netdev:
 601         netdev_upper_dev_unlink(phy_dev, dev);
 602 unregister_netdev:
 603         unregister_netdevice(dev);
 604 remove_ida:
 605         ida_simple_remove(&port->ida, dev->dev_id);
 606 destroy_ipvlan_port:
 607         if (create)
 608                 ipvlan_port_destroy(phy_dev);
 609         return err;
 610 }
 611 EXPORT_SYMBOL_GPL(ipvlan_link_new);
 612
 613 void ipvlan_link_delete(struct net_device *dev, struct list_head *head)
 614 {
 615         struct ipvl_dev *ipvlan = netdev_priv(dev);
 616         struct ipvl_addr *addr, *next;
 617
 618         list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) {
 619                 ipvlan_ht_addr_del(addr);
 620                 list_del(&addr->anode);
 621                 kfree_rcu(addr, rcu);
 622         }
 623
 624         ida_simple_remove(&ipvlan->port->ida, dev->dev_id);
 625         list_del_rcu(&ipvlan->pnode);
 626         unregister_netdevice_queue(dev, head);
 627         netdev_upper_dev_unlink(ipvlan->phy_dev, dev);
 628 }
 629 EXPORT_SYMBOL_GPL(ipvlan_link_delete);
 630
 631 void ipvlan_link_setup(struct net_device *dev)
 632 {
 633         ether_setup(dev);
 634
 635         dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
 636         dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE;
 637         dev->netdev_ops = &ipvlan_netdev_ops;
 638         dev->needs_free_netdev = true;
 639         dev->header_ops = &ipvlan_header_ops;
 640         dev->ethtool_ops = &ipvlan_ethtool_ops;
 641 }
 642 EXPORT_SYMBOL_GPL(ipvlan_link_setup);
 643
 644 static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] =
 645 {
 646         [IFLA_IPVLAN_MODE] = { .type = NLA_U16 },
 647 };
 648
 649 static struct rtnl_link_ops ipvlan_link_ops = {
 650         .kind           = "ipvlan",
 651         .priv_size      = sizeof(struct ipvl_dev),
 652
 653         .setup          = ipvlan_link_setup,
 654         .newlink        = ipvlan_link_new,
 655         .dellink        = ipvlan_link_delete,
 656 };
 657
 658 int ipvlan_link_register(struct rtnl_link_ops *ops)
 659 {
 660         ops->get_size   = ipvlan_nl_getsize;
 661         ops->policy     = ipvlan_nl_policy;
 662         ops->validate   = ipvlan_nl_validate;
 663         ops->fill_info  = ipvlan_nl_fillinfo;
 664         ops->changelink = ipvlan_nl_changelink;
 665         ops->maxtype    = IFLA_IPVLAN_MAX;
 666         return rtnl_link_register(ops);
 667 }
 668 EXPORT_SYMBOL_GPL(ipvlan_link_register);
 669
 670 static int ipvlan_device_event(struct notifier_block *unused,
 671                                unsigned long event, void *ptr)
 672 {
 673         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 674         struct ipvl_dev *ipvlan, *next;
 675         struct ipvl_port *port;
 676         LIST_HEAD(lst_kill);
 677
 678         if (!netif_is_ipvlan_port(dev))
 679                 return NOTIFY_DONE;
 680
 681         port = ipvlan_port_get_rtnl(dev);
 682
 683         switch (event) {
 684         case NETDEV_CHANGE:
 685                 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
 686                         netif_stacked_transfer_operstate(ipvlan->phy_dev,
 687                                                          ipvlan->dev);
 688                 break;
 689
 690         case NETDEV_REGISTER: {
 691                 struct net *oldnet, *newnet = dev_net(dev);
 692                 struct ipvlan_netns *old_vnet;
 693
 694                 oldnet = read_pnet(&port->pnet);
 695                 if (net_eq(newnet, oldnet))
 696                         break;
 697
 698                 write_pnet(&port->pnet, newnet);
 699
 700                 old_vnet = net_generic(oldnet, ipvlan_netid);
 701                 if (!old_vnet->ipvl_nf_hook_refcnt)
 702                         break;
 703
 704                 ipvlan_register_nf_hook(newnet);
 705                 ipvlan_unregister_nf_hook(oldnet);
 706                 break;
 707         }
 708         case NETDEV_UNREGISTER:
 709                 if (dev->reg_state != NETREG_UNREGISTERING)
 710                         break;
 711
 712                 list_for_each_entry_safe(ipvlan, next, &port->ipvlans,
 713                                          pnode)
 714                         ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev,
 715                                                             &lst_kill);
 716                 unregister_netdevice_many(&lst_kill);
 717                 break;
 718
 719         case NETDEV_FEAT_CHANGE:
 720                 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
 721                         ipvlan->dev->features = dev->features & IPVLAN_FEATURES;
 722                         ipvlan->dev->gso_max_size = dev->gso_max_size;
 723                         ipvlan->dev->gso_max_segs = dev->gso_max_segs;
 724                         netdev_features_change(ipvlan->dev);
 725                 }
 726                 break;
 727
 728         case NETDEV_CHANGEMTU:
 729                 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
 730                         ipvlan_adjust_mtu(ipvlan, dev);
 731                 break;
 732
 733         case NETDEV_PRE_TYPE_CHANGE:
 734                 /* Forbid underlying device to change its type. */
 735                 return NOTIFY_BAD;
 736         }
 737         return NOTIFY_DONE;
 738 }
 739
 740 static int ipvlan_add_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
 741 {
 742         struct ipvl_addr *addr;
 743
 744         addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC);
 745         if (!addr)
 746                 return -ENOMEM;
 747
 748         addr->master = ipvlan;
 749         if (is_v6) {
 750                 memcpy(&addr->ip6addr, iaddr, sizeof(struct in6_addr));
 751                 addr->atype = IPVL_IPV6;
 752         } else {
 753                 memcpy(&addr->ip4addr, iaddr, sizeof(struct in_addr));
 754                 addr->atype = IPVL_IPV4;
 755         }
 756         list_add_tail(&addr->anode, &ipvlan->addrs);
 757
 758         /* If the interface is not up, the address will be added to the hash
 759          * list by ipvlan_open.
 760          */
 761         if (netif_running(ipvlan->dev))
 762                 ipvlan_ht_addr_add(ipvlan, addr);
 763
 764         return 0;
 765 }
 766
 767 static void ipvlan_del_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
 768 {
 769         struct ipvl_addr *addr;
 770
 771         addr = ipvlan_find_addr(ipvlan, iaddr, is_v6);
 772         if (!addr)
 773                 return;
 774
 775         ipvlan_ht_addr_del(addr);
 776         list_del(&addr->anode);
 777         kfree_rcu(addr, rcu);
 778
 779         return;
 780 }
 781
 782 static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
 783 {
 784         if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true)) {
 785                 netif_err(ipvlan, ifup, ipvlan->dev,
 786                           "Failed to add IPv6=%pI6c addr for %s intf\n",
 787                           ip6_addr, ipvlan->dev->name);
 788                 return -EINVAL;
 789         }
 790
 791         return ipvlan_add_addr(ipvlan, ip6_addr, true);
 792 }
 793
 794 static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
 795 {
 796         return ipvlan_del_addr(ipvlan, ip6_addr, true);
 797 }
 798
 799 static int ipvlan_addr6_event(struct notifier_block *unused,
 800                               unsigned long event, void *ptr)
 801 {
 802         struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr;
 803         struct net_device *dev = (struct net_device *)if6->idev->dev;
 804         struct ipvl_dev *ipvlan = netdev_priv(dev);
 805
 806         /* FIXME IPv6 autoconf calls us from bh without RTNL */
 807         if (in_softirq())
 808                 return NOTIFY_DONE;
 809
 810         if (!netif_is_ipvlan(dev))
 811                 return NOTIFY_DONE;
 812
 813         if (!ipvlan || !ipvlan->port)
 814                 return NOTIFY_DONE;
 815
 816         switch (event) {
 817         case NETDEV_UP:
 818                 if (ipvlan_add_addr6(ipvlan, &if6->addr))
 819                         return NOTIFY_BAD;
 820                 break;
 821
 822         case NETDEV_DOWN:
 823                 ipvlan_del_addr6(ipvlan, &if6->addr);
 824                 break;
 825         }
 826
 827         return NOTIFY_OK;
 828 }
 829
 830 static int ipvlan_addr6_validator_event(struct notifier_block *unused,
 831                                         unsigned long event, void *ptr)
 832 {
 833         struct in6_validator_info *i6vi = (struct in6_validator_info *)ptr;
 834         struct net_device *dev = (struct net_device *)i6vi->i6vi_dev->dev;
 835         struct ipvl_dev *ipvlan = netdev_priv(dev);
 836
 837         /* FIXME IPv6 autoconf calls us from bh without RTNL */
 838         if (in_softirq())
 839                 return NOTIFY_DONE;
 840
 841         if (!netif_is_ipvlan(dev))
 842                 return NOTIFY_DONE;
 843
 844         if (!ipvlan || !ipvlan->port)
 845                 return NOTIFY_DONE;
 846
 847         switch (event) {
 848         case NETDEV_UP:
 849                 if (ipvlan_addr_busy(ipvlan->port, &i6vi->i6vi_addr, true))
 850                         return notifier_from_errno(-EADDRINUSE);
 851                 break;
 852         }
 853
 854         return NOTIFY_OK;
 855 }
 856
 857 static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
 858 {
 859         if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false)) {
 860                 netif_err(ipvlan, ifup, ipvlan->dev,
 861                           "Failed to add IPv4=%pI4 on %s intf.\n",
 862                           ip4_addr, ipvlan->dev->name);
 863                 return -EINVAL;
 864         }
 865
 866         return ipvlan_add_addr(ipvlan, ip4_addr, false);
 867 }
 868
 869 static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
 870 {
 871         return ipvlan_del_addr(ipvlan, ip4_addr, false);
 872 }
 873
 874 static int ipvlan_addr4_event(struct notifier_block *unused,
 875                               unsigned long event, void *ptr)
 876 {
 877         struct in_ifaddr *if4 = (struct in_ifaddr *)ptr;
 878         struct net_device *dev = (struct net_device *)if4->ifa_dev->dev;
 879         struct ipvl_dev *ipvlan = netdev_priv(dev);
 880         struct in_addr ip4_addr;
 881
 882         if (!netif_is_ipvlan(dev))
 883                 return NOTIFY_DONE;
 884
 885         if (!ipvlan || !ipvlan->port)
 886                 return NOTIFY_DONE;
 887
 888         switch (event) {
 889         case NETDEV_UP:
 890                 ip4_addr.s_addr = if4->ifa_address;
 891                 if (ipvlan_add_addr4(ipvlan, &ip4_addr))
 892                         return NOTIFY_BAD;
 893                 break;
 894
 895         case NETDEV_DOWN:
 896                 ip4_addr.s_addr = if4->ifa_address;
 897                 ipvlan_del_addr4(ipvlan, &ip4_addr);
 898                 break;
 899         }
 900
 901         return NOTIFY_OK;
 902 }
 903
 904 static int ipvlan_addr4_validator_event(struct notifier_block *unused,
 905                                         unsigned long event, void *ptr)
 906 {
 907         struct in_validator_info *ivi = (struct in_validator_info *)ptr;
 908         struct net_device *dev = (struct net_device *)ivi->ivi_dev->dev;
 909         struct ipvl_dev *ipvlan = netdev_priv(dev);
 910
 911         if (!netif_is_ipvlan(dev))
 912                 return NOTIFY_DONE;
 913
 914         if (!ipvlan || !ipvlan->port)
 915                 return NOTIFY_DONE;
 916
 917         switch (event) {
 918         case NETDEV_UP:
 919                 if (ipvlan_addr_busy(ipvlan->port, &ivi->ivi_addr, false))
 920                         return notifier_from_errno(-EADDRINUSE);
 921                 break;
 922         }
 923
 924         return NOTIFY_OK;
 925 }
 926
 927 static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = {
 928         .notifier_call = ipvlan_addr4_event,
 929 };
 930
 931 static struct notifier_block ipvlan_addr4_vtor_notifier_block __read_mostly = {
 932         .notifier_call = ipvlan_addr4_validator_event,
 933 };
 934
 935 static struct notifier_block ipvlan_notifier_block __read_mostly = {
 936         .notifier_call = ipvlan_device_event,
 937 };
 938
 939 static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = {
 940         .notifier_call = ipvlan_addr6_event,
 941 };
 942
 943 static struct notifier_block ipvlan_addr6_vtor_notifier_block __read_mostly = {
 944         .notifier_call = ipvlan_addr6_validator_event,
 945 };
 946
 947 static void ipvlan_ns_exit(struct net *net)
 948 {
 949         struct ipvlan_netns *vnet = net_generic(net, ipvlan_netid);
 950
 951         if (WARN_ON_ONCE(vnet->ipvl_nf_hook_refcnt)) {
 952                 vnet->ipvl_nf_hook_refcnt = 0;
 953                 nf_unregister_net_hooks(net, ipvl_nfops,
 954                                         ARRAY_SIZE(ipvl_nfops));
 955         }
 956 }
 957
 958 static struct pernet_operations ipvlan_net_ops = {
 959         .id = &ipvlan_netid,
 960         .size = sizeof(struct ipvlan_netns),
 961         .exit = ipvlan_ns_exit,
 962 };
 963
 964 static int __init ipvlan_init_module(void)
 965 {
 966         int err;
 967
 968         ipvlan_init_secret();
 969         register_netdevice_notifier(&ipvlan_notifier_block);
 970         register_inet6addr_notifier(&ipvlan_addr6_notifier_block);
 971         register_inet6addr_validator_notifier(
 972             &ipvlan_addr6_vtor_notifier_block);
 973         register_inetaddr_notifier(&ipvlan_addr4_notifier_block);
 974         register_inetaddr_validator_notifier(&ipvlan_addr4_vtor_notifier_block);
 975
 976         err = register_pernet_subsys(&ipvlan_net_ops);
 977         if (err < 0)
 978                 goto error;
 979
 980         err = ipvlan_link_register(&ipvlan_link_ops);
 981         if (err < 0) {
 982                 unregister_pernet_subsys(&ipvlan_net_ops);
 983                 goto error;
 984         }
 985
 986         return 0;
 987 error:
 988         unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
 989         unregister_inetaddr_validator_notifier(
 990             &ipvlan_addr4_vtor_notifier_block);
 991         unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
 992         unregister_inet6addr_validator_notifier(
 993             &ipvlan_addr6_vtor_notifier_block);
 994         unregister_netdevice_notifier(&ipvlan_notifier_block);
 995         return err;
 996 }
 997
 998 static void __exit ipvlan_cleanup_module(void)
 999 {
1000         rtnl_link_unregister(&ipvlan_link_ops);
1001         unregister_pernet_subsys(&ipvlan_net_ops);
1002         unregister_netdevice_notifier(&ipvlan_notifier_block);
1003         unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1004         unregister_inetaddr_validator_notifier(
1005             &ipvlan_addr4_vtor_notifier_block);
1006         unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1007         unregister_inet6addr_validator_notifier(
1008             &ipvlan_addr6_vtor_notifier_block);
1009 }
1010
1011 module_init(ipvlan_init_module);
1012 module_exit(ipvlan_cleanup_module);
1013
1014 MODULE_LICENSE("GPL");
1015 MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>");
1016 MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs");
1017 MODULE_ALIAS_RTNL_LINK("ipvlan");