drivers/net/ipvlan/ipvlan_main.c

   1 /* Copyright (c) 2014 Mahesh Bandewar <[email protected]>
   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         {
  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_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 ? : phy_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)
 466                 return 0;
 467
 468         if (data[IFLA_IPVLAN_MODE]) {
 469                 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
 470
 471                 err = ipvlan_set_port_mode(port, nmode);
 472         }
 473
 474         if (!err && data[IFLA_IPVLAN_FLAGS]) {
 475                 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
 476
 477                 if (flags & IPVLAN_F_PRIVATE)
 478                         ipvlan_mark_private(port);
 479                 else
 480                         ipvlan_clear_private(port);
 481
 482                 if (flags & IPVLAN_F_VEPA)
 483                         ipvlan_mark_vepa(port);
 484                 else
 485                         ipvlan_clear_vepa(port);
 486         }
 487
 488         return err;
 489 }
 490
 491 static size_t ipvlan_nl_getsize(const struct net_device *dev)
 492 {
 493         return (0
 494                 + nla_total_size(2) /* IFLA_IPVLAN_MODE */
 495                 + nla_total_size(2) /* IFLA_IPVLAN_FLAGS */
 496                 );
 497 }
 498
 499 static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[],
 500                               struct netlink_ext_ack *extack)
 501 {
 502         if (!data)
 503                 return 0;
 504
 505         if (data[IFLA_IPVLAN_MODE]) {
 506                 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
 507
 508                 if (mode < IPVLAN_MODE_L2 || mode >= IPVLAN_MODE_MAX)
 509                         return -EINVAL;
 510         }
 511         if (data[IFLA_IPVLAN_FLAGS]) {
 512                 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
 513
 514                 /* Only two bits are used at this moment. */
 515                 if (flags & ~(IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
 516                         return -EINVAL;
 517                 /* Also both flags can't be active at the same time. */
 518                 if ((flags & (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) ==
 519                     (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
 520                         return -EINVAL;
 521         }
 522
 523         return 0;
 524 }
 525
 526 static int ipvlan_nl_fillinfo(struct sk_buff *skb,
 527                               const struct net_device *dev)
 528 {
 529         struct ipvl_dev *ipvlan = netdev_priv(dev);
 530         struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
 531         int ret = -EINVAL;
 532
 533         if (!port)
 534                 goto err;
 535
 536         ret = -EMSGSIZE;
 537         if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode))
 538                 goto err;
 539         if (nla_put_u16(skb, IFLA_IPVLAN_FLAGS, port->flags))
 540                 goto err;
 541
 542         return 0;
 543
 544 err:
 545         return ret;
 546 }
 547
 548 int ipvlan_link_new(struct net *src_net, struct net_device *dev,
 549                     struct nlattr *tb[], struct nlattr *data[],
 550                     struct netlink_ext_ack *extack)
 551 {
 552         struct ipvl_dev *ipvlan = netdev_priv(dev);
 553         struct ipvl_port *port;
 554         struct net_device *phy_dev;
 555         int err;
 556         u16 mode = IPVLAN_MODE_L3;
 557         bool create = false;
 558
 559         if (!tb[IFLA_LINK])
 560                 return -EINVAL;
 561
 562         phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
 563         if (!phy_dev)
 564                 return -ENODEV;
 565
 566         if (netif_is_ipvlan(phy_dev)) {
 567                 struct ipvl_dev *tmp = netdev_priv(phy_dev);
 568
 569                 phy_dev = tmp->phy_dev;
 570         } else if (!netif_is_ipvlan_port(phy_dev)) {
 571                 err = ipvlan_port_create(phy_dev);
 572                 if (err < 0)
 573                         return err;
 574                 create = true;
 575         }
 576
 577         if (data && data[IFLA_IPVLAN_MODE])
 578                 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
 579
 580         port = ipvlan_port_get_rtnl(phy_dev);
 581         ipvlan->phy_dev = phy_dev;
 582         ipvlan->dev = dev;
 583         ipvlan->port = port;
 584         ipvlan->sfeatures = IPVLAN_FEATURES;
 585         ipvlan_adjust_mtu(ipvlan, phy_dev);
 586         INIT_LIST_HEAD(&ipvlan->addrs);
 587
 588         /* Flags are per port and latest update overrides. User has
 589          * to be consistent in setting it just like the mode attribute.
 590          */
 591         if (data && data[IFLA_IPVLAN_FLAGS])
 592                 ipvlan->port->flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
 593
 594         /* If the port-id base is at the MAX value, then wrap it around and
 595          * begin from 0x1 again. This may be due to a busy system where lots
 596          * of slaves are getting created and deleted.
 597          */
 598         if (port->dev_id_start == 0xFFFE)
 599                 port->dev_id_start = 0x1;
 600
 601         /* Since L2 address is shared among all IPvlan slaves including
 602          * master, use unique 16 bit dev-ids to diffentiate among them.
 603          * Assign IDs between 0x1 and 0xFFFE (used by the master) to each
 604          * slave link [see addrconf_ifid_eui48()].
 605          */
 606         err = ida_simple_get(&port->ida, port->dev_id_start, 0xFFFE,
 607                              GFP_KERNEL);
 608         if (err < 0)
 609                 err = ida_simple_get(&port->ida, 0x1, port->dev_id_start,
 610                                      GFP_KERNEL);
 611         if (err < 0)
 612                 goto destroy_ipvlan_port;
 613         dev->dev_id = err;
 614         /* Increment id-base to the next slot for the future assignment */
 615         port->dev_id_start = err + 1;
 616
 617         /* TODO Probably put random address here to be presented to the
 618          * world but keep using the physical-dev address for the outgoing
 619          * packets.
 620          */
 621         memcpy(dev->dev_addr, phy_dev->dev_addr, ETH_ALEN);
 622
 623         dev->priv_flags |= IFF_IPVLAN_SLAVE;
 624
 625         err = register_netdevice(dev);
 626         if (err < 0)
 627                 goto remove_ida;
 628
 629         err = netdev_upper_dev_link(phy_dev, dev, extack);
 630         if (err) {
 631                 goto unregister_netdev;
 632         }
 633         err = ipvlan_set_port_mode(port, mode);
 634         if (err) {
 635                 goto unlink_netdev;
 636         }
 637
 638         list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans);
 639         netif_stacked_transfer_operstate(phy_dev, dev);
 640         return 0;
 641
 642 unlink_netdev:
 643         netdev_upper_dev_unlink(phy_dev, dev);
 644 unregister_netdev:
 645         unregister_netdevice(dev);
 646 remove_ida:
 647         ida_simple_remove(&port->ida, dev->dev_id);
 648 destroy_ipvlan_port:
 649         if (create)
 650                 ipvlan_port_destroy(phy_dev);
 651         return err;
 652 }
 653 EXPORT_SYMBOL_GPL(ipvlan_link_new);
 654
 655 void ipvlan_link_delete(struct net_device *dev, struct list_head *head)
 656 {
 657         struct ipvl_dev *ipvlan = netdev_priv(dev);
 658         struct ipvl_addr *addr, *next;
 659
 660         list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) {
 661                 ipvlan_ht_addr_del(addr);
 662                 list_del(&addr->anode);
 663                 kfree_rcu(addr, rcu);
 664         }
 665
 666         ida_simple_remove(&ipvlan->port->ida, dev->dev_id);
 667         list_del_rcu(&ipvlan->pnode);
 668         unregister_netdevice_queue(dev, head);
 669         netdev_upper_dev_unlink(ipvlan->phy_dev, dev);
 670 }
 671 EXPORT_SYMBOL_GPL(ipvlan_link_delete);
 672
 673 void ipvlan_link_setup(struct net_device *dev)
 674 {
 675         ether_setup(dev);
 676
 677         dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
 678         dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE;
 679         dev->netdev_ops = &ipvlan_netdev_ops;
 680         dev->needs_free_netdev = true;
 681         dev->header_ops = &ipvlan_header_ops;
 682         dev->ethtool_ops = &ipvlan_ethtool_ops;
 683 }
 684 EXPORT_SYMBOL_GPL(ipvlan_link_setup);
 685
 686 static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] =
 687 {
 688         [IFLA_IPVLAN_MODE] = { .type = NLA_U16 },
 689         [IFLA_IPVLAN_FLAGS] = { .type = NLA_U16 },
 690 };
 691
 692 static struct rtnl_link_ops ipvlan_link_ops = {
 693         .kind           = "ipvlan",
 694         .priv_size      = sizeof(struct ipvl_dev),
 695
 696         .setup          = ipvlan_link_setup,
 697         .newlink        = ipvlan_link_new,
 698         .dellink        = ipvlan_link_delete,
 699 };
 700
 701 int ipvlan_link_register(struct rtnl_link_ops *ops)
 702 {
 703         ops->get_size   = ipvlan_nl_getsize;
 704         ops->policy     = ipvlan_nl_policy;
 705         ops->validate   = ipvlan_nl_validate;
 706         ops->fill_info  = ipvlan_nl_fillinfo;
 707         ops->changelink = ipvlan_nl_changelink;
 708         ops->maxtype    = IFLA_IPVLAN_MAX;
 709         return rtnl_link_register(ops);
 710 }
 711 EXPORT_SYMBOL_GPL(ipvlan_link_register);
 712
 713 static int ipvlan_device_event(struct notifier_block *unused,
 714                                unsigned long event, void *ptr)
 715 {
 716         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 717         struct ipvl_dev *ipvlan, *next;
 718         struct ipvl_port *port;
 719         LIST_HEAD(lst_kill);
 720
 721         if (!netif_is_ipvlan_port(dev))
 722                 return NOTIFY_DONE;
 723
 724         port = ipvlan_port_get_rtnl(dev);
 725
 726         switch (event) {
 727         case NETDEV_CHANGE:
 728                 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
 729                         netif_stacked_transfer_operstate(ipvlan->phy_dev,
 730                                                          ipvlan->dev);
 731                 break;
 732
 733         case NETDEV_REGISTER: {
 734                 struct net *oldnet, *newnet = dev_net(dev);
 735                 struct ipvlan_netns *old_vnet;
 736
 737                 oldnet = read_pnet(&port->pnet);
 738                 if (net_eq(newnet, oldnet))
 739                         break;
 740
 741                 write_pnet(&port->pnet, newnet);
 742
 743                 old_vnet = net_generic(oldnet, ipvlan_netid);
 744                 if (!old_vnet->ipvl_nf_hook_refcnt)
 745                         break;
 746
 747                 ipvlan_register_nf_hook(newnet);
 748                 ipvlan_unregister_nf_hook(oldnet);
 749                 break;
 750         }
 751         case NETDEV_UNREGISTER:
 752                 if (dev->reg_state != NETREG_UNREGISTERING)
 753                         break;
 754
 755                 list_for_each_entry_safe(ipvlan, next, &port->ipvlans,
 756                                          pnode)
 757                         ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev,
 758                                                             &lst_kill);
 759                 unregister_netdevice_many(&lst_kill);
 760                 break;
 761
 762         case NETDEV_FEAT_CHANGE:
 763                 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
 764                         ipvlan->dev->features = dev->features & IPVLAN_FEATURES;
 765                         ipvlan->dev->gso_max_size = dev->gso_max_size;
 766                         ipvlan->dev->gso_max_segs = dev->gso_max_segs;
 767                         netdev_features_change(ipvlan->dev);
 768                 }
 769                 break;
 770
 771         case NETDEV_CHANGEMTU:
 772                 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
 773                         ipvlan_adjust_mtu(ipvlan, dev);
 774                 break;
 775
 776         case NETDEV_CHANGEADDR:
 777                 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
 778                         ether_addr_copy(ipvlan->dev->dev_addr, dev->dev_addr);
 779                 break;
 780
 781         case NETDEV_PRE_TYPE_CHANGE:
 782                 /* Forbid underlying device to change its type. */
 783                 return NOTIFY_BAD;
 784         }
 785         return NOTIFY_DONE;
 786 }
 787
 788 static int ipvlan_add_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
 789 {
 790         struct ipvl_addr *addr;
 791
 792         addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC);
 793         if (!addr)
 794                 return -ENOMEM;
 795
 796         addr->master = ipvlan;
 797         if (is_v6) {
 798                 memcpy(&addr->ip6addr, iaddr, sizeof(struct in6_addr));
 799                 addr->atype = IPVL_IPV6;
 800         } else {
 801                 memcpy(&addr->ip4addr, iaddr, sizeof(struct in_addr));
 802                 addr->atype = IPVL_IPV4;
 803         }
 804         list_add_tail(&addr->anode, &ipvlan->addrs);
 805
 806         /* If the interface is not up, the address will be added to the hash
 807          * list by ipvlan_open.
 808          */
 809         if (netif_running(ipvlan->dev))
 810                 ipvlan_ht_addr_add(ipvlan, addr);
 811
 812         return 0;
 813 }
 814
 815 static void ipvlan_del_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
 816 {
 817         struct ipvl_addr *addr;
 818
 819         addr = ipvlan_find_addr(ipvlan, iaddr, is_v6);
 820         if (!addr)
 821                 return;
 822
 823         ipvlan_ht_addr_del(addr);
 824         list_del(&addr->anode);
 825         kfree_rcu(addr, rcu);
 826
 827         return;
 828 }
 829
 830 static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
 831 {
 832         if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true)) {
 833                 netif_err(ipvlan, ifup, ipvlan->dev,
 834                           "Failed to add IPv6=%pI6c addr for %s intf\n",
 835                           ip6_addr, ipvlan->dev->name);
 836                 return -EINVAL;
 837         }
 838
 839         return ipvlan_add_addr(ipvlan, ip6_addr, true);
 840 }
 841
 842 static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
 843 {
 844         return ipvlan_del_addr(ipvlan, ip6_addr, true);
 845 }
 846
 847 static int ipvlan_addr6_event(struct notifier_block *unused,
 848                               unsigned long event, void *ptr)
 849 {
 850         struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr;
 851         struct net_device *dev = (struct net_device *)if6->idev->dev;
 852         struct ipvl_dev *ipvlan = netdev_priv(dev);
 853
 854         if (!netif_is_ipvlan(dev))
 855                 return NOTIFY_DONE;
 856
 857         if (!ipvlan || !ipvlan->port)
 858                 return NOTIFY_DONE;
 859
 860         switch (event) {
 861         case NETDEV_UP:
 862                 if (ipvlan_add_addr6(ipvlan, &if6->addr))
 863                         return NOTIFY_BAD;
 864                 break;
 865
 866         case NETDEV_DOWN:
 867                 ipvlan_del_addr6(ipvlan, &if6->addr);
 868                 break;
 869         }
 870
 871         return NOTIFY_OK;
 872 }
 873
 874 static int ipvlan_addr6_validator_event(struct notifier_block *unused,
 875                                         unsigned long event, void *ptr)
 876 {
 877         struct in6_validator_info *i6vi = (struct in6_validator_info *)ptr;
 878         struct net_device *dev = (struct net_device *)i6vi->i6vi_dev->dev;
 879         struct ipvl_dev *ipvlan = netdev_priv(dev);
 880
 881         /* FIXME IPv6 autoconf calls us from bh without RTNL */
 882         if (in_softirq())
 883                 return NOTIFY_DONE;
 884
 885         if (!netif_is_ipvlan(dev))
 886                 return NOTIFY_DONE;
 887
 888         if (!ipvlan || !ipvlan->port)
 889                 return NOTIFY_DONE;
 890
 891         switch (event) {
 892         case NETDEV_UP:
 893                 if (ipvlan_addr_busy(ipvlan->port, &i6vi->i6vi_addr, true)) {
 894                         NL_SET_ERR_MSG(i6vi->extack,
 895                                        "Address already assigned to an ipvlan device");
 896                         return notifier_from_errno(-EADDRINUSE);
 897                 }
 898                 break;
 899         }
 900
 901         return NOTIFY_OK;
 902 }
 903
 904 static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
 905 {
 906         if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false)) {
 907                 netif_err(ipvlan, ifup, ipvlan->dev,
 908                           "Failed to add IPv4=%pI4 on %s intf.\n",
 909                           ip4_addr, ipvlan->dev->name);
 910                 return -EINVAL;
 911         }
 912
 913         return ipvlan_add_addr(ipvlan, ip4_addr, false);
 914 }
 915
 916 static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
 917 {
 918         return ipvlan_del_addr(ipvlan, ip4_addr, false);
 919 }
 920
 921 static int ipvlan_addr4_event(struct notifier_block *unused,
 922                               unsigned long event, void *ptr)
 923 {
 924         struct in_ifaddr *if4 = (struct in_ifaddr *)ptr;
 925         struct net_device *dev = (struct net_device *)if4->ifa_dev->dev;
 926         struct ipvl_dev *ipvlan = netdev_priv(dev);
 927         struct in_addr ip4_addr;
 928
 929         if (!netif_is_ipvlan(dev))
 930                 return NOTIFY_DONE;
 931
 932         if (!ipvlan || !ipvlan->port)
 933                 return NOTIFY_DONE;
 934
 935         switch (event) {
 936         case NETDEV_UP:
 937                 ip4_addr.s_addr = if4->ifa_address;
 938                 if (ipvlan_add_addr4(ipvlan, &ip4_addr))
 939                         return NOTIFY_BAD;
 940                 break;
 941
 942         case NETDEV_DOWN:
 943                 ip4_addr.s_addr = if4->ifa_address;
 944                 ipvlan_del_addr4(ipvlan, &ip4_addr);
 945                 break;
 946         }
 947
 948         return NOTIFY_OK;
 949 }
 950
 951 static int ipvlan_addr4_validator_event(struct notifier_block *unused,
 952                                         unsigned long event, void *ptr)
 953 {
 954         struct in_validator_info *ivi = (struct in_validator_info *)ptr;
 955         struct net_device *dev = (struct net_device *)ivi->ivi_dev->dev;
 956         struct ipvl_dev *ipvlan = netdev_priv(dev);
 957
 958         if (!netif_is_ipvlan(dev))
 959                 return NOTIFY_DONE;
 960
 961         if (!ipvlan || !ipvlan->port)
 962                 return NOTIFY_DONE;
 963
 964         switch (event) {
 965         case NETDEV_UP:
 966                 if (ipvlan_addr_busy(ipvlan->port, &ivi->ivi_addr, false)) {
 967                         NL_SET_ERR_MSG(ivi->extack,
 968                                        "Address already assigned to an ipvlan device");
 969                         return notifier_from_errno(-EADDRINUSE);
 970                 }
 971                 break;
 972         }
 973
 974         return NOTIFY_OK;
 975 }
 976
 977 static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = {
 978         .notifier_call = ipvlan_addr4_event,
 979 };
 980
 981 static struct notifier_block ipvlan_addr4_vtor_notifier_block __read_mostly = {
 982         .notifier_call = ipvlan_addr4_validator_event,
 983 };
 984
 985 static struct notifier_block ipvlan_notifier_block __read_mostly = {
 986         .notifier_call = ipvlan_device_event,
 987 };
 988
 989 static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = {
 990         .notifier_call = ipvlan_addr6_event,
 991 };
 992
 993 static struct notifier_block ipvlan_addr6_vtor_notifier_block __read_mostly = {
 994         .notifier_call = ipvlan_addr6_validator_event,
 995 };
 996
 997 static void ipvlan_ns_exit(struct net *net)
 998 {
 999         struct ipvlan_netns *vnet = net_generic(net, ipvlan_netid);
1000
1001         if (WARN_ON_ONCE(vnet->ipvl_nf_hook_refcnt)) {
1002                 vnet->ipvl_nf_hook_refcnt = 0;
1003                 nf_unregister_net_hooks(net, ipvl_nfops,
1004                                         ARRAY_SIZE(ipvl_nfops));
1005         }
1006 }
1007
1008 static struct pernet_operations ipvlan_net_ops = {
1009         .id = &ipvlan_netid,
1010         .size = sizeof(struct ipvlan_netns),
1011         .exit = ipvlan_ns_exit,
1012 };
1013
1014 static int __init ipvlan_init_module(void)
1015 {
1016         int err;
1017
1018         ipvlan_init_secret();
1019         register_netdevice_notifier(&ipvlan_notifier_block);
1020         register_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1021         register_inet6addr_validator_notifier(
1022             &ipvlan_addr6_vtor_notifier_block);
1023         register_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1024         register_inetaddr_validator_notifier(&ipvlan_addr4_vtor_notifier_block);
1025
1026         err = register_pernet_subsys(&ipvlan_net_ops);
1027         if (err < 0)
1028                 goto error;
1029
1030         err = ipvlan_link_register(&ipvlan_link_ops);
1031         if (err < 0) {
1032                 unregister_pernet_subsys(&ipvlan_net_ops);
1033                 goto error;
1034         }
1035
1036         return 0;
1037 error:
1038         unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1039         unregister_inetaddr_validator_notifier(
1040             &ipvlan_addr4_vtor_notifier_block);
1041         unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1042         unregister_inet6addr_validator_notifier(
1043             &ipvlan_addr6_vtor_notifier_block);
1044         unregister_netdevice_notifier(&ipvlan_notifier_block);
1045         return err;
1046 }
1047
1048 static void __exit ipvlan_cleanup_module(void)
1049 {
1050         rtnl_link_unregister(&ipvlan_link_ops);
1051         unregister_pernet_subsys(&ipvlan_net_ops);
1052         unregister_netdevice_notifier(&ipvlan_notifier_block);
1053         unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1054         unregister_inetaddr_validator_notifier(
1055             &ipvlan_addr4_vtor_notifier_block);
1056         unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1057         unregister_inet6addr_validator_notifier(
1058             &ipvlan_addr6_vtor_notifier_block);
1059 }
1060
1061 module_init(ipvlan_init_module);
1062 module_exit(ipvlan_cleanup_module);
1063
1064 MODULE_LICENSE("GPL");
1065 MODULE_AUTHOR("Mahesh Bandewar <[email protected]>");
1066 MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs");
1067 MODULE_ALIAS_RTNL_LINK("ipvlan");