drivers/net/ipvlan/ipvlan_main.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /* Copyright (c) 2014 Mahesh Bandewar <maheshb@google.com>
   3  */
   4
   5 #include <linux/ethtool.h>
   6
   7 #include "ipvlan.h"
   8
   9 static int ipvlan_set_port_mode(struct ipvl_port *port, u16 nval,
  10                                 struct netlink_ext_ack *extack)
  11 {
  12         struct ipvl_dev *ipvlan;
  13         unsigned int flags;
  14         int err;
  15
  16         ASSERT_RTNL();
  17         if (port->mode != nval) {
  18                 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
  19                         flags = ipvlan->dev->flags;
  20                         if (nval == IPVLAN_MODE_L3 || nval == IPVLAN_MODE_L3S) {
  21                                 err = dev_change_flags(ipvlan->dev,
  22                                                        flags | IFF_NOARP,
  23                                                        extack);
  24                         } else {
  25                                 err = dev_change_flags(ipvlan->dev,
  26                                                        flags & ~IFF_NOARP,
  27                                                        extack);
  28                         }
  29                         if (unlikely(err))
  30                                 goto fail;
  31                 }
  32                 if (nval == IPVLAN_MODE_L3S) {
  33                         /* New mode is L3S */
  34                         err = ipvlan_l3s_register(port);
  35                         if (err)
  36                                 goto fail;
  37                 } else if (port->mode == IPVLAN_MODE_L3S) {
  38                         /* Old mode was L3S */
  39                         ipvlan_l3s_unregister(port);
  40                 }
  41                 port->mode = nval;
  42         }
  43         return 0;
  44
  45 fail:
  46         /* Undo the flags changes that have been done so far. */
  47         list_for_each_entry_continue_reverse(ipvlan, &port->ipvlans, pnode) {
  48                 flags = ipvlan->dev->flags;
  49                 if (port->mode == IPVLAN_MODE_L3 ||
  50                     port->mode == IPVLAN_MODE_L3S)
  51                         dev_change_flags(ipvlan->dev, flags | IFF_NOARP,
  52                                          NULL);
  53                 else
  54                         dev_change_flags(ipvlan->dev, flags & ~IFF_NOARP,
  55                                          NULL);
  56         }
  57
  58         return err;
  59 }
  60
  61 static int ipvlan_port_create(struct net_device *dev)
  62 {
  63         struct ipvl_port *port;
  64         int err, idx;
  65
  66         port = kzalloc(sizeof(struct ipvl_port), GFP_KERNEL);
  67         if (!port)
  68                 return -ENOMEM;
  69
  70         write_pnet(&port->pnet, dev_net(dev));
  71         port->dev = dev;
  72         port->mode = IPVLAN_MODE_L3;
  73         INIT_LIST_HEAD(&port->ipvlans);
  74         for (idx = 0; idx < IPVLAN_HASH_SIZE; idx++)
  75                 INIT_HLIST_HEAD(&port->hlhead[idx]);
  76
  77         skb_queue_head_init(&port->backlog);
  78         INIT_WORK(&port->wq, ipvlan_process_multicast);
  79         ida_init(&port->ida);
  80         port->dev_id_start = 1;
  81
  82         err = netdev_rx_handler_register(dev, ipvlan_handle_frame, port);
  83         if (err)
  84                 goto err;
  85
  86         return 0;
  87
  88 err:
  89         kfree(port);
  90         return err;
  91 }
  92
  93 static void ipvlan_port_destroy(struct net_device *dev)
  94 {
  95         struct ipvl_port *port = ipvlan_port_get_rtnl(dev);
  96         struct sk_buff *skb;
  97
  98         if (port->mode == IPVLAN_MODE_L3S)
  99                 ipvlan_l3s_unregister(port);
 100         netdev_rx_handler_unregister(dev);
 101         cancel_work_sync(&port->wq);
 102         while ((skb = __skb_dequeue(&port->backlog)) != NULL) {
 103                 if (skb->dev)
 104                         dev_put(skb->dev);
 105                 kfree_skb(skb);
 106         }
 107         ida_destroy(&port->ida);
 108         kfree(port);
 109 }
 110
 111 #define IPVLAN_ALWAYS_ON_OFLOADS \
 112         (NETIF_F_SG | NETIF_F_HW_CSUM | \
 113          NETIF_F_GSO_ROBUST | NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL)
 114
 115 #define IPVLAN_ALWAYS_ON \
 116         (IPVLAN_ALWAYS_ON_OFLOADS | NETIF_F_LLTX | NETIF_F_VLAN_CHALLENGED)
 117
 118 #define IPVLAN_FEATURES \
 119         (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
 120          NETIF_F_GSO | NETIF_F_ALL_TSO | NETIF_F_GSO_ROBUST | \
 121          NETIF_F_GRO | NETIF_F_RXCSUM | \
 122          NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
 123
 124         /* NETIF_F_GSO_ENCAP_ALL NETIF_F_GSO_SOFTWARE Newly added */
 125
 126 #define IPVLAN_STATE_MASK \
 127         ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
 128
 129 static int ipvlan_init(struct net_device *dev)
 130 {
 131         struct ipvl_dev *ipvlan = netdev_priv(dev);
 132         struct net_device *phy_dev = ipvlan->phy_dev;
 133         struct ipvl_port *port;
 134         int err;
 135
 136         dev->state = (dev->state & ~IPVLAN_STATE_MASK) |
 137                      (phy_dev->state & IPVLAN_STATE_MASK);
 138         dev->features = phy_dev->features & IPVLAN_FEATURES;
 139         dev->features |= IPVLAN_ALWAYS_ON;
 140         dev->vlan_features = phy_dev->vlan_features & IPVLAN_FEATURES;
 141         dev->vlan_features |= IPVLAN_ALWAYS_ON_OFLOADS;
 142         dev->hw_enc_features |= dev->features;
 143         dev->gso_max_size = phy_dev->gso_max_size;
 144         dev->gso_max_segs = phy_dev->gso_max_segs;
 145         dev->hard_header_len = phy_dev->hard_header_len;
 146
 147         netdev_lockdep_set_classes(dev);
 148
 149         ipvlan->pcpu_stats = netdev_alloc_pcpu_stats(struct ipvl_pcpu_stats);
 150         if (!ipvlan->pcpu_stats)
 151                 return -ENOMEM;
 152
 153         if (!netif_is_ipvlan_port(phy_dev)) {
 154                 err = ipvlan_port_create(phy_dev);
 155                 if (err < 0) {
 156                         free_percpu(ipvlan->pcpu_stats);
 157                         return err;
 158                 }
 159         }
 160         port = ipvlan_port_get_rtnl(phy_dev);
 161         port->count += 1;
 162         return 0;
 163 }
 164
 165 static void ipvlan_uninit(struct net_device *dev)
 166 {
 167         struct ipvl_dev *ipvlan = netdev_priv(dev);
 168         struct net_device *phy_dev = ipvlan->phy_dev;
 169         struct ipvl_port *port;
 170
 171         free_percpu(ipvlan->pcpu_stats);
 172
 173         port = ipvlan_port_get_rtnl(phy_dev);
 174         port->count -= 1;
 175         if (!port->count)
 176                 ipvlan_port_destroy(port->dev);
 177 }
 178
 179 static int ipvlan_open(struct net_device *dev)
 180 {
 181         struct ipvl_dev *ipvlan = netdev_priv(dev);
 182         struct ipvl_addr *addr;
 183
 184         if (ipvlan->port->mode == IPVLAN_MODE_L3 ||
 185             ipvlan->port->mode == IPVLAN_MODE_L3S)
 186                 dev->flags |= IFF_NOARP;
 187         else
 188                 dev->flags &= ~IFF_NOARP;
 189
 190         rcu_read_lock();
 191         list_for_each_entry_rcu(addr, &ipvlan->addrs, anode)
 192                 ipvlan_ht_addr_add(ipvlan, addr);
 193         rcu_read_unlock();
 194
 195         return 0;
 196 }
 197
 198 static int ipvlan_stop(struct net_device *dev)
 199 {
 200         struct ipvl_dev *ipvlan = netdev_priv(dev);
 201         struct net_device *phy_dev = ipvlan->phy_dev;
 202         struct ipvl_addr *addr;
 203
 204         dev_uc_unsync(phy_dev, dev);
 205         dev_mc_unsync(phy_dev, dev);
 206
 207         rcu_read_lock();
 208         list_for_each_entry_rcu(addr, &ipvlan->addrs, anode)
 209                 ipvlan_ht_addr_del(addr);
 210         rcu_read_unlock();
 211
 212         return 0;
 213 }
 214
 215 static netdev_tx_t ipvlan_start_xmit(struct sk_buff *skb,
 216                                      struct net_device *dev)
 217 {
 218         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 219         int skblen = skb->len;
 220         int ret;
 221
 222         ret = ipvlan_queue_xmit(skb, dev);
 223         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 224                 struct ipvl_pcpu_stats *pcptr;
 225
 226                 pcptr = this_cpu_ptr(ipvlan->pcpu_stats);
 227
 228                 u64_stats_update_begin(&pcptr->syncp);
 229                 pcptr->tx_pkts++;
 230                 pcptr->tx_bytes += skblen;
 231                 u64_stats_update_end(&pcptr->syncp);
 232         } else {
 233                 this_cpu_inc(ipvlan->pcpu_stats->tx_drps);
 234         }
 235         return ret;
 236 }
 237
 238 static netdev_features_t ipvlan_fix_features(struct net_device *dev,
 239                                              netdev_features_t features)
 240 {
 241         struct ipvl_dev *ipvlan = netdev_priv(dev);
 242
 243         features |= NETIF_F_ALL_FOR_ALL;
 244         features &= (ipvlan->sfeatures | ~IPVLAN_FEATURES);
 245         features = netdev_increment_features(ipvlan->phy_dev->features,
 246                                              features, features);
 247         features |= IPVLAN_ALWAYS_ON;
 248         features &= (IPVLAN_FEATURES | IPVLAN_ALWAYS_ON);
 249
 250         return features;
 251 }
 252
 253 static void ipvlan_change_rx_flags(struct net_device *dev, int change)
 254 {
 255         struct ipvl_dev *ipvlan = netdev_priv(dev);
 256         struct net_device *phy_dev = ipvlan->phy_dev;
 257
 258         if (change & IFF_ALLMULTI)
 259                 dev_set_allmulti(phy_dev, dev->flags & IFF_ALLMULTI? 1 : -1);
 260 }
 261
 262 static void ipvlan_set_multicast_mac_filter(struct net_device *dev)
 263 {
 264         struct ipvl_dev *ipvlan = netdev_priv(dev);
 265
 266         if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
 267                 bitmap_fill(ipvlan->mac_filters, IPVLAN_MAC_FILTER_SIZE);
 268         } else {
 269                 struct netdev_hw_addr *ha;
 270                 DECLARE_BITMAP(mc_filters, IPVLAN_MAC_FILTER_SIZE);
 271
 272                 bitmap_zero(mc_filters, IPVLAN_MAC_FILTER_SIZE);
 273                 netdev_for_each_mc_addr(ha, dev)
 274                         __set_bit(ipvlan_mac_hash(ha->addr), mc_filters);
 275
 276                 /* Turn-on broadcast bit irrespective of address family,
 277                  * since broadcast is deferred to a work-queue, hence no
 278                  * impact on fast-path processing.
 279                  */
 280                 __set_bit(ipvlan_mac_hash(dev->broadcast), mc_filters);
 281
 282                 bitmap_copy(ipvlan->mac_filters, mc_filters,
 283                             IPVLAN_MAC_FILTER_SIZE);
 284         }
 285         dev_uc_sync(ipvlan->phy_dev, dev);
 286         dev_mc_sync(ipvlan->phy_dev, dev);
 287 }
 288
 289 static void ipvlan_get_stats64(struct net_device *dev,
 290                                struct rtnl_link_stats64 *s)
 291 {
 292         struct ipvl_dev *ipvlan = netdev_priv(dev);
 293
 294         if (ipvlan->pcpu_stats) {
 295                 struct ipvl_pcpu_stats *pcptr;
 296                 u64 rx_pkts, rx_bytes, rx_mcast, tx_pkts, tx_bytes;
 297                 u32 rx_errs = 0, tx_drps = 0;
 298                 u32 strt;
 299                 int idx;
 300
 301                 for_each_possible_cpu(idx) {
 302                         pcptr = per_cpu_ptr(ipvlan->pcpu_stats, idx);
 303                         do {
 304                                 strt= u64_stats_fetch_begin_irq(&pcptr->syncp);
 305                                 rx_pkts = pcptr->rx_pkts;
 306                                 rx_bytes = pcptr->rx_bytes;
 307                                 rx_mcast = pcptr->rx_mcast;
 308                                 tx_pkts = pcptr->tx_pkts;
 309                                 tx_bytes = pcptr->tx_bytes;
 310                         } while (u64_stats_fetch_retry_irq(&pcptr->syncp,
 311                                                            strt));
 312
 313                         s->rx_packets += rx_pkts;
 314                         s->rx_bytes += rx_bytes;
 315                         s->multicast += rx_mcast;
 316                         s->tx_packets += tx_pkts;
 317                         s->tx_bytes += tx_bytes;
 318
 319                         /* u32 values are updated without syncp protection. */
 320                         rx_errs += pcptr->rx_errs;
 321                         tx_drps += pcptr->tx_drps;
 322                 }
 323                 s->rx_errors = rx_errs;
 324                 s->rx_dropped = rx_errs;
 325                 s->tx_dropped = tx_drps;
 326         }
 327 }
 328
 329 static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid)
 330 {
 331         struct ipvl_dev *ipvlan = netdev_priv(dev);
 332         struct net_device *phy_dev = ipvlan->phy_dev;
 333
 334         return vlan_vid_add(phy_dev, proto, vid);
 335 }
 336
 337 static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
 338                                    u16 vid)
 339 {
 340         struct ipvl_dev *ipvlan = netdev_priv(dev);
 341         struct net_device *phy_dev = ipvlan->phy_dev;
 342
 343         vlan_vid_del(phy_dev, proto, vid);
 344         return 0;
 345 }
 346
 347 static int ipvlan_get_iflink(const struct net_device *dev)
 348 {
 349         struct ipvl_dev *ipvlan = netdev_priv(dev);
 350
 351         return ipvlan->phy_dev->ifindex;
 352 }
 353
 354 static const struct net_device_ops ipvlan_netdev_ops = {
 355         .ndo_init               = ipvlan_init,
 356         .ndo_uninit             = ipvlan_uninit,
 357         .ndo_open               = ipvlan_open,
 358         .ndo_stop               = ipvlan_stop,
 359         .ndo_start_xmit         = ipvlan_start_xmit,
 360         .ndo_fix_features       = ipvlan_fix_features,
 361         .ndo_change_rx_flags    = ipvlan_change_rx_flags,
 362         .ndo_set_rx_mode        = ipvlan_set_multicast_mac_filter,
 363         .ndo_get_stats64        = ipvlan_get_stats64,
 364         .ndo_vlan_rx_add_vid    = ipvlan_vlan_rx_add_vid,
 365         .ndo_vlan_rx_kill_vid   = ipvlan_vlan_rx_kill_vid,
 366         .ndo_get_iflink         = ipvlan_get_iflink,
 367 };
 368
 369 static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
 370                               unsigned short type, const void *daddr,
 371                               const void *saddr, unsigned len)
 372 {
 373         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 374         struct net_device *phy_dev = ipvlan->phy_dev;
 375
 376         /* TODO Probably use a different field than dev_addr so that the
 377          * mac-address on the virtual device is portable and can be carried
 378          * while the packets use the mac-addr on the physical device.
 379          */
 380         return dev_hard_header(skb, phy_dev, type, daddr,
 381                                saddr ? : phy_dev->dev_addr, len);
 382 }
 383
 384 static const struct header_ops ipvlan_header_ops = {
 385         .create         = ipvlan_hard_header,
 386         .parse          = eth_header_parse,
 387         .cache          = eth_header_cache,
 388         .cache_update   = eth_header_cache_update,
 389 };
 390
 391 static void ipvlan_adjust_mtu(struct ipvl_dev *ipvlan, struct net_device *dev)
 392 {
 393         ipvlan->dev->mtu = dev->mtu;
 394 }
 395
 396 static bool netif_is_ipvlan(const struct net_device *dev)
 397 {
 398         /* both ipvlan and ipvtap devices use the same netdev_ops */
 399         return dev->netdev_ops == &ipvlan_netdev_ops;
 400 }
 401
 402 static int ipvlan_ethtool_get_link_ksettings(struct net_device *dev,
 403                                              struct ethtool_link_ksettings *cmd)
 404 {
 405         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 406
 407         return __ethtool_get_link_ksettings(ipvlan->phy_dev, cmd);
 408 }
 409
 410 static void ipvlan_ethtool_get_drvinfo(struct net_device *dev,
 411                                        struct ethtool_drvinfo *drvinfo)
 412 {
 413         strlcpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver));
 414         strlcpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version));
 415 }
 416
 417 static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev)
 418 {
 419         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 420
 421         return ipvlan->msg_enable;
 422 }
 423
 424 static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value)
 425 {
 426         struct ipvl_dev *ipvlan = netdev_priv(dev);
 427
 428         ipvlan->msg_enable = value;
 429 }
 430
 431 static const struct ethtool_ops ipvlan_ethtool_ops = {
 432         .get_link       = ethtool_op_get_link,
 433         .get_link_ksettings     = ipvlan_ethtool_get_link_ksettings,
 434         .get_drvinfo    = ipvlan_ethtool_get_drvinfo,
 435         .get_msglevel   = ipvlan_ethtool_get_msglevel,
 436         .set_msglevel   = ipvlan_ethtool_set_msglevel,
 437 };
 438
 439 static int ipvlan_nl_changelink(struct net_device *dev,
 440                                 struct nlattr *tb[], struct nlattr *data[],
 441                                 struct netlink_ext_ack *extack)
 442 {
 443         struct ipvl_dev *ipvlan = netdev_priv(dev);
 444         struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
 445         int err = 0;
 446
 447         if (!data)
 448                 return 0;
 449         if (!ns_capable(dev_net(ipvlan->phy_dev)->user_ns, CAP_NET_ADMIN))
 450                 return -EPERM;
 451
 452         if (data[IFLA_IPVLAN_MODE]) {
 453                 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
 454
 455                 err = ipvlan_set_port_mode(port, nmode, extack);
 456         }
 457
 458         if (!err && data[IFLA_IPVLAN_FLAGS]) {
 459                 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
 460
 461                 if (flags & IPVLAN_F_PRIVATE)
 462                         ipvlan_mark_private(port);
 463                 else
 464                         ipvlan_clear_private(port);
 465
 466                 if (flags & IPVLAN_F_VEPA)
 467                         ipvlan_mark_vepa(port);
 468                 else
 469                         ipvlan_clear_vepa(port);
 470         }
 471
 472         return err;
 473 }
 474
 475 static size_t ipvlan_nl_getsize(const struct net_device *dev)
 476 {
 477         return (0
 478                 + nla_total_size(2) /* IFLA_IPVLAN_MODE */
 479                 + nla_total_size(2) /* IFLA_IPVLAN_FLAGS */
 480                 );
 481 }
 482
 483 static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[],
 484                               struct netlink_ext_ack *extack)
 485 {
 486         if (!data)
 487                 return 0;
 488
 489         if (data[IFLA_IPVLAN_MODE]) {
 490                 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
 491
 492                 if (mode >= IPVLAN_MODE_MAX)
 493                         return -EINVAL;
 494         }
 495         if (data[IFLA_IPVLAN_FLAGS]) {
 496                 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
 497
 498                 /* Only two bits are used at this moment. */
 499                 if (flags & ~(IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
 500                         return -EINVAL;
 501                 /* Also both flags can't be active at the same time. */
 502                 if ((flags & (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) ==
 503                     (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
 504                         return -EINVAL;
 505         }
 506
 507         return 0;
 508 }
 509
 510 static int ipvlan_nl_fillinfo(struct sk_buff *skb,
 511                               const struct net_device *dev)
 512 {
 513         struct ipvl_dev *ipvlan = netdev_priv(dev);
 514         struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
 515         int ret = -EINVAL;
 516
 517         if (!port)
 518                 goto err;
 519
 520         ret = -EMSGSIZE;
 521         if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode))
 522                 goto err;
 523         if (nla_put_u16(skb, IFLA_IPVLAN_FLAGS, port->flags))
 524                 goto err;
 525
 526         return 0;
 527
 528 err:
 529         return ret;
 530 }
 531
 532 int ipvlan_link_new(struct net *src_net, struct net_device *dev,
 533                     struct nlattr *tb[], struct nlattr *data[],
 534                     struct netlink_ext_ack *extack)
 535 {
 536         struct ipvl_dev *ipvlan = netdev_priv(dev);
 537         struct ipvl_port *port;
 538         struct net_device *phy_dev;
 539         int err;
 540         u16 mode = IPVLAN_MODE_L3;
 541
 542         if (!tb[IFLA_LINK])
 543                 return -EINVAL;
 544
 545         phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
 546         if (!phy_dev)
 547                 return -ENODEV;
 548
 549         if (netif_is_ipvlan(phy_dev)) {
 550                 struct ipvl_dev *tmp = netdev_priv(phy_dev);
 551
 552                 phy_dev = tmp->phy_dev;
 553                 if (!ns_capable(dev_net(phy_dev)->user_ns, CAP_NET_ADMIN))
 554                         return -EPERM;
 555         } else if (!netif_is_ipvlan_port(phy_dev)) {
 556                 /* Exit early if the underlying link is invalid or busy */
 557                 if (phy_dev->type != ARPHRD_ETHER ||
 558                     phy_dev->flags & IFF_LOOPBACK) {
 559                         netdev_err(phy_dev,
 560                                    "Master is either lo or non-ether device\n");
 561                         return -EINVAL;
 562                 }
 563
 564                 if (netdev_is_rx_handler_busy(phy_dev)) {
 565                         netdev_err(phy_dev, "Device is already in use.\n");
 566                         return -EBUSY;
 567                 }
 568         }
 569
 570         ipvlan->phy_dev = phy_dev;
 571         ipvlan->dev = dev;
 572         ipvlan->sfeatures = IPVLAN_FEATURES;
 573         if (!tb[IFLA_MTU])
 574                 ipvlan_adjust_mtu(ipvlan, phy_dev);
 575         INIT_LIST_HEAD(&ipvlan->addrs);
 576         spin_lock_init(&ipvlan->addrs_lock);
 577
 578         /* TODO Probably put random address here to be presented to the
 579          * world but keep using the physical-dev address for the outgoing
 580          * packets.
 581          */
 582         memcpy(dev->dev_addr, phy_dev->dev_addr, ETH_ALEN);
 583
 584         dev->priv_flags |= IFF_NO_RX_HANDLER;
 585
 586         err = register_netdevice(dev);
 587         if (err < 0)
 588                 return err;
 589
 590         /* ipvlan_init() would have created the port, if required */
 591         port = ipvlan_port_get_rtnl(phy_dev);
 592         ipvlan->port = port;
 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 unregister_netdev;
 613         dev->dev_id = err;
 614
 615         /* Increment id-base to the next slot for the future assignment */
 616         port->dev_id_start = err + 1;
 617
 618         err = netdev_upper_dev_link(phy_dev, dev, extack);
 619         if (err)
 620                 goto remove_ida;
 621
 622         /* Flags are per port and latest update overrides. User has
 623          * to be consistent in setting it just like the mode attribute.
 624          */
 625         if (data && data[IFLA_IPVLAN_FLAGS])
 626                 port->flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
 627
 628         if (data && data[IFLA_IPVLAN_MODE])
 629                 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
 630
 631         err = ipvlan_set_port_mode(port, mode, extack);
 632         if (err)
 633                 goto unlink_netdev;
 634
 635         list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans);
 636         netif_stacked_transfer_operstate(phy_dev, dev);
 637         return 0;
 638
 639 unlink_netdev:
 640         netdev_upper_dev_unlink(phy_dev, dev);
 641 remove_ida:
 642         ida_simple_remove(&port->ida, dev->dev_id);
 643 unregister_netdev:
 644         unregister_netdevice(dev);
 645         return err;
 646 }
 647 EXPORT_SYMBOL_GPL(ipvlan_link_new);
 648
 649 void ipvlan_link_delete(struct net_device *dev, struct list_head *head)
 650 {
 651         struct ipvl_dev *ipvlan = netdev_priv(dev);
 652         struct ipvl_addr *addr, *next;
 653
 654         spin_lock_bh(&ipvlan->addrs_lock);
 655         list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) {
 656                 ipvlan_ht_addr_del(addr);
 657                 list_del_rcu(&addr->anode);
 658                 kfree_rcu(addr, rcu);
 659         }
 660         spin_unlock_bh(&ipvlan->addrs_lock);
 661
 662         ida_simple_remove(&ipvlan->port->ida, dev->dev_id);
 663         list_del_rcu(&ipvlan->pnode);
 664         unregister_netdevice_queue(dev, head);
 665         netdev_upper_dev_unlink(ipvlan->phy_dev, dev);
 666 }
 667 EXPORT_SYMBOL_GPL(ipvlan_link_delete);
 668
 669 void ipvlan_link_setup(struct net_device *dev)
 670 {
 671         ether_setup(dev);
 672
 673         dev->max_mtu = ETH_MAX_MTU;
 674         dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
 675         dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE;
 676         dev->netdev_ops = &ipvlan_netdev_ops;
 677         dev->needs_free_netdev = true;
 678         dev->header_ops = &ipvlan_header_ops;
 679         dev->ethtool_ops = &ipvlan_ethtool_ops;
 680 }
 681 EXPORT_SYMBOL_GPL(ipvlan_link_setup);
 682
 683 static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] =
 684 {
 685         [IFLA_IPVLAN_MODE] = { .type = NLA_U16 },
 686         [IFLA_IPVLAN_FLAGS] = { .type = NLA_U16 },
 687 };
 688
 689 static struct net *ipvlan_get_link_net(const struct net_device *dev)
 690 {
 691         struct ipvl_dev *ipvlan = netdev_priv(dev);
 692
 693         return dev_net(ipvlan->phy_dev);
 694 }
 695
 696 static struct rtnl_link_ops ipvlan_link_ops = {
 697         .kind           = "ipvlan",
 698         .priv_size      = sizeof(struct ipvl_dev),
 699
 700         .setup          = ipvlan_link_setup,
 701         .newlink        = ipvlan_link_new,
 702         .dellink        = ipvlan_link_delete,
 703         .get_link_net   = ipvlan_get_link_net,
 704 };
 705
 706 int ipvlan_link_register(struct rtnl_link_ops *ops)
 707 {
 708         ops->get_size   = ipvlan_nl_getsize;
 709         ops->policy     = ipvlan_nl_policy;
 710         ops->validate   = ipvlan_nl_validate;
 711         ops->fill_info  = ipvlan_nl_fillinfo;
 712         ops->changelink = ipvlan_nl_changelink;
 713         ops->maxtype    = IFLA_IPVLAN_MAX;
 714         return rtnl_link_register(ops);
 715 }
 716 EXPORT_SYMBOL_GPL(ipvlan_link_register);
 717
 718 static int ipvlan_device_event(struct notifier_block *unused,
 719                                unsigned long event, void *ptr)
 720 {
 721         struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr);
 722         struct netdev_notifier_pre_changeaddr_info *prechaddr_info;
 723         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 724         struct ipvl_dev *ipvlan, *next;
 725         struct ipvl_port *port;
 726         LIST_HEAD(lst_kill);
 727         int err;
 728
 729         if (!netif_is_ipvlan_port(dev))
 730                 return NOTIFY_DONE;
 731
 732         port = ipvlan_port_get_rtnl(dev);
 733
 734         switch (event) {
 735         case NETDEV_UP:
 736         case NETDEV_CHANGE:
 737                 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
 738                         netif_stacked_transfer_operstate(ipvlan->phy_dev,
 739                                                          ipvlan->dev);
 740                 break;
 741
 742         case NETDEV_REGISTER: {
 743                 struct net *oldnet, *newnet = dev_net(dev);
 744
 745                 oldnet = read_pnet(&port->pnet);
 746                 if (net_eq(newnet, oldnet))
 747                         break;
 748
 749                 write_pnet(&port->pnet, newnet);
 750
 751                 ipvlan_migrate_l3s_hook(oldnet, newnet);
 752                 break;
 753         }
 754         case NETDEV_UNREGISTER:
 755                 if (dev->reg_state != NETREG_UNREGISTERING)
 756                         break;
 757
 758                 list_for_each_entry_safe(ipvlan, next, &port->ipvlans, pnode)
 759                         ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev,
 760                                                             &lst_kill);
 761                 unregister_netdevice_many(&lst_kill);
 762                 break;
 763
 764         case NETDEV_FEAT_CHANGE:
 765                 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
 766                         ipvlan->dev->gso_max_size = dev->gso_max_size;
 767                         ipvlan->dev->gso_max_segs = dev->gso_max_segs;
 768                         netdev_update_features(ipvlan->dev);
 769                 }
 770                 break;
 771
 772         case NETDEV_CHANGEMTU:
 773                 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
 774                         ipvlan_adjust_mtu(ipvlan, dev);
 775                 break;
 776
 777         case NETDEV_PRE_CHANGEADDR:
 778                 prechaddr_info = ptr;
 779                 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
 780                         err = dev_pre_changeaddr_notify(ipvlan->dev,
 781                                                     prechaddr_info->dev_addr,
 782                                                     extack);
 783                         if (err)
 784                                 return notifier_from_errno(err);
 785                 }
 786                 break;
 787
 788         case NETDEV_CHANGEADDR:
 789                 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
 790                         ether_addr_copy(ipvlan->dev->dev_addr, dev->dev_addr);
 791                         call_netdevice_notifiers(NETDEV_CHANGEADDR, ipvlan->dev);
 792                 }
 793                 break;
 794
 795         case NETDEV_PRE_TYPE_CHANGE:
 796                 /* Forbid underlying device to change its type. */
 797                 return NOTIFY_BAD;
 798         }
 799         return NOTIFY_DONE;
 800 }
 801
 802 /* the caller must held the addrs lock */
 803 static int ipvlan_add_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
 804 {
 805         struct ipvl_addr *addr;
 806
 807         addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC);
 808         if (!addr)
 809                 return -ENOMEM;
 810
 811         addr->master = ipvlan;
 812         if (!is_v6) {
 813                 memcpy(&addr->ip4addr, iaddr, sizeof(struct in_addr));
 814                 addr->atype = IPVL_IPV4;
 815 #if IS_ENABLED(CONFIG_IPV6)
 816         } else {
 817                 memcpy(&addr->ip6addr, iaddr, sizeof(struct in6_addr));
 818                 addr->atype = IPVL_IPV6;
 819 #endif
 820         }
 821
 822         list_add_tail_rcu(&addr->anode, &ipvlan->addrs);
 823
 824         /* If the interface is not up, the address will be added to the hash
 825          * list by ipvlan_open.
 826          */
 827         if (netif_running(ipvlan->dev))
 828                 ipvlan_ht_addr_add(ipvlan, addr);
 829
 830         return 0;
 831 }
 832
 833 static void ipvlan_del_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
 834 {
 835         struct ipvl_addr *addr;
 836
 837         spin_lock_bh(&ipvlan->addrs_lock);
 838         addr = ipvlan_find_addr(ipvlan, iaddr, is_v6);
 839         if (!addr) {
 840                 spin_unlock_bh(&ipvlan->addrs_lock);
 841                 return;
 842         }
 843
 844         ipvlan_ht_addr_del(addr);
 845         list_del_rcu(&addr->anode);
 846         spin_unlock_bh(&ipvlan->addrs_lock);
 847         kfree_rcu(addr, rcu);
 848 }
 849
 850 static bool ipvlan_is_valid_dev(const struct net_device *dev)
 851 {
 852         struct ipvl_dev *ipvlan = netdev_priv(dev);
 853
 854         if (!netif_is_ipvlan(dev))
 855                 return false;
 856
 857         if (!ipvlan || !ipvlan->port)
 858                 return false;
 859
 860         return true;
 861 }
 862
 863 #if IS_ENABLED(CONFIG_IPV6)
 864 static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
 865 {
 866         int ret = -EINVAL;
 867
 868         spin_lock_bh(&ipvlan->addrs_lock);
 869         if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true))
 870                 netif_err(ipvlan, ifup, ipvlan->dev,
 871                           "Failed to add IPv6=%pI6c addr for %s intf\n",
 872                           ip6_addr, ipvlan->dev->name);
 873         else
 874                 ret = ipvlan_add_addr(ipvlan, ip6_addr, true);
 875         spin_unlock_bh(&ipvlan->addrs_lock);
 876         return ret;
 877 }
 878
 879 static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
 880 {
 881         return ipvlan_del_addr(ipvlan, ip6_addr, true);
 882 }
 883
 884 static int ipvlan_addr6_event(struct notifier_block *unused,
 885                               unsigned long event, void *ptr)
 886 {
 887         struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr;
 888         struct net_device *dev = (struct net_device *)if6->idev->dev;
 889         struct ipvl_dev *ipvlan = netdev_priv(dev);
 890
 891         if (!ipvlan_is_valid_dev(dev))
 892                 return NOTIFY_DONE;
 893
 894         switch (event) {
 895         case NETDEV_UP:
 896                 if (ipvlan_add_addr6(ipvlan, &if6->addr))
 897                         return NOTIFY_BAD;
 898                 break;
 899
 900         case NETDEV_DOWN:
 901                 ipvlan_del_addr6(ipvlan, &if6->addr);
 902                 break;
 903         }
 904
 905         return NOTIFY_OK;
 906 }
 907
 908 static int ipvlan_addr6_validator_event(struct notifier_block *unused,
 909                                         unsigned long event, void *ptr)
 910 {
 911         struct in6_validator_info *i6vi = (struct in6_validator_info *)ptr;
 912         struct net_device *dev = (struct net_device *)i6vi->i6vi_dev->dev;
 913         struct ipvl_dev *ipvlan = netdev_priv(dev);
 914
 915         if (!ipvlan_is_valid_dev(dev))
 916                 return NOTIFY_DONE;
 917
 918         switch (event) {
 919         case NETDEV_UP:
 920                 if (ipvlan_addr_busy(ipvlan->port, &i6vi->i6vi_addr, true)) {
 921                         NL_SET_ERR_MSG(i6vi->extack,
 922                                        "Address already assigned to an ipvlan device");
 923                         return notifier_from_errno(-EADDRINUSE);
 924                 }
 925                 break;
 926         }
 927
 928         return NOTIFY_OK;
 929 }
 930 #endif
 931
 932 static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
 933 {
 934         int ret = -EINVAL;
 935
 936         spin_lock_bh(&ipvlan->addrs_lock);
 937         if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false))
 938                 netif_err(ipvlan, ifup, ipvlan->dev,
 939                           "Failed to add IPv4=%pI4 on %s intf.\n",
 940                           ip4_addr, ipvlan->dev->name);
 941         else
 942                 ret = ipvlan_add_addr(ipvlan, ip4_addr, false);
 943         spin_unlock_bh(&ipvlan->addrs_lock);
 944         return ret;
 945 }
 946
 947 static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
 948 {
 949         return ipvlan_del_addr(ipvlan, ip4_addr, false);
 950 }
 951
 952 static int ipvlan_addr4_event(struct notifier_block *unused,
 953                               unsigned long event, void *ptr)
 954 {
 955         struct in_ifaddr *if4 = (struct in_ifaddr *)ptr;
 956         struct net_device *dev = (struct net_device *)if4->ifa_dev->dev;
 957         struct ipvl_dev *ipvlan = netdev_priv(dev);
 958         struct in_addr ip4_addr;
 959
 960         if (!ipvlan_is_valid_dev(dev))
 961                 return NOTIFY_DONE;
 962
 963         switch (event) {
 964         case NETDEV_UP:
 965                 ip4_addr.s_addr = if4->ifa_address;
 966                 if (ipvlan_add_addr4(ipvlan, &ip4_addr))
 967                         return NOTIFY_BAD;
 968                 break;
 969
 970         case NETDEV_DOWN:
 971                 ip4_addr.s_addr = if4->ifa_address;
 972                 ipvlan_del_addr4(ipvlan, &ip4_addr);
 973                 break;
 974         }
 975
 976         return NOTIFY_OK;
 977 }
 978
 979 static int ipvlan_addr4_validator_event(struct notifier_block *unused,
 980                                         unsigned long event, void *ptr)
 981 {
 982         struct in_validator_info *ivi = (struct in_validator_info *)ptr;
 983         struct net_device *dev = (struct net_device *)ivi->ivi_dev->dev;
 984         struct ipvl_dev *ipvlan = netdev_priv(dev);
 985
 986         if (!ipvlan_is_valid_dev(dev))
 987                 return NOTIFY_DONE;
 988
 989         switch (event) {
 990         case NETDEV_UP:
 991                 if (ipvlan_addr_busy(ipvlan->port, &ivi->ivi_addr, false)) {
 992                         NL_SET_ERR_MSG(ivi->extack,
 993                                        "Address already assigned to an ipvlan device");
 994                         return notifier_from_errno(-EADDRINUSE);
 995                 }
 996                 break;
 997         }
 998
 999         return NOTIFY_OK;
1000 }
1001
1002 static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = {
1003         .notifier_call = ipvlan_addr4_event,
1004 };
1005
1006 static struct notifier_block ipvlan_addr4_vtor_notifier_block __read_mostly = {
1007         .notifier_call = ipvlan_addr4_validator_event,
1008 };
1009
1010 static struct notifier_block ipvlan_notifier_block __read_mostly = {
1011         .notifier_call = ipvlan_device_event,
1012 };
1013
1014 #if IS_ENABLED(CONFIG_IPV6)
1015 static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = {
1016         .notifier_call = ipvlan_addr6_event,
1017 };
1018
1019 static struct notifier_block ipvlan_addr6_vtor_notifier_block __read_mostly = {
1020         .notifier_call = ipvlan_addr6_validator_event,
1021 };
1022 #endif
1023
1024 static int __init ipvlan_init_module(void)
1025 {
1026         int err;
1027
1028         ipvlan_init_secret();
1029         register_netdevice_notifier(&ipvlan_notifier_block);
1030 #if IS_ENABLED(CONFIG_IPV6)
1031         register_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1032         register_inet6addr_validator_notifier(
1033             &ipvlan_addr6_vtor_notifier_block);
1034 #endif
1035         register_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1036         register_inetaddr_validator_notifier(&ipvlan_addr4_vtor_notifier_block);
1037
1038         err = ipvlan_l3s_init();
1039         if (err < 0)
1040                 goto error;
1041
1042         err = ipvlan_link_register(&ipvlan_link_ops);
1043         if (err < 0) {
1044                 ipvlan_l3s_cleanup();
1045                 goto error;
1046         }
1047
1048         return 0;
1049 error:
1050         unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1051         unregister_inetaddr_validator_notifier(
1052             &ipvlan_addr4_vtor_notifier_block);
1053 #if IS_ENABLED(CONFIG_IPV6)
1054         unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1055         unregister_inet6addr_validator_notifier(
1056             &ipvlan_addr6_vtor_notifier_block);
1057 #endif
1058         unregister_netdevice_notifier(&ipvlan_notifier_block);
1059         return err;
1060 }
1061
1062 static void __exit ipvlan_cleanup_module(void)
1063 {
1064         rtnl_link_unregister(&ipvlan_link_ops);
1065         ipvlan_l3s_cleanup();
1066         unregister_netdevice_notifier(&ipvlan_notifier_block);
1067         unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1068         unregister_inetaddr_validator_notifier(
1069             &ipvlan_addr4_vtor_notifier_block);
1070 #if IS_ENABLED(CONFIG_IPV6)
1071         unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1072         unregister_inet6addr_validator_notifier(
1073             &ipvlan_addr6_vtor_notifier_block);
1074 #endif
1075 }
1076
1077 module_init(ipvlan_init_module);
1078 module_exit(ipvlan_cleanup_module);
1079
1080 MODULE_LICENSE("GPL");
1081 MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>");
1082 MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs");
1083 MODULE_ALIAS_RTNL_LINK("ipvlan");