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         netdev_hold(dev, &port->dev_tracker, GFP_KERNEL);
  87         return 0;
  88
  89 err:
  90         kfree(port);
  91         return err;
  92 }
  93
  94 static void ipvlan_port_destroy(struct net_device *dev)
  95 {
  96         struct ipvl_port *port = ipvlan_port_get_rtnl(dev);
  97         struct sk_buff *skb;
  98
  99         netdev_put(dev, &port->dev_tracker);
 100         if (port->mode == IPVLAN_MODE_L3S)
 101                 ipvlan_l3s_unregister(port);
 102         netdev_rx_handler_unregister(dev);
 103         cancel_work_sync(&port->wq);
 104         while ((skb = __skb_dequeue(&port->backlog)) != NULL) {
 105                 dev_put(skb->dev);
 106                 kfree_skb(skb);
 107         }
 108         ida_destroy(&port->ida);
 109         kfree(port);
 110 }
 111
 112 #define IPVLAN_ALWAYS_ON_OFLOADS \
 113         (NETIF_F_SG | NETIF_F_HW_CSUM | \
 114          NETIF_F_GSO_ROBUST | NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL)
 115
 116 #define IPVLAN_ALWAYS_ON \
 117         (IPVLAN_ALWAYS_ON_OFLOADS | NETIF_F_LLTX | NETIF_F_VLAN_CHALLENGED)
 118
 119 #define IPVLAN_FEATURES \
 120         (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
 121          NETIF_F_GSO | NETIF_F_ALL_TSO | NETIF_F_GSO_ROBUST | \
 122          NETIF_F_GRO | NETIF_F_RXCSUM | \
 123          NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
 124
 125         /* NETIF_F_GSO_ENCAP_ALL NETIF_F_GSO_SOFTWARE Newly added */
 126
 127 #define IPVLAN_STATE_MASK \
 128         ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
 129
 130 static int ipvlan_init(struct net_device *dev)
 131 {
 132         struct ipvl_dev *ipvlan = netdev_priv(dev);
 133         struct net_device *phy_dev = ipvlan->phy_dev;
 134         struct ipvl_port *port;
 135         int err;
 136
 137         dev->state = (dev->state & ~IPVLAN_STATE_MASK) |
 138                      (phy_dev->state & IPVLAN_STATE_MASK);
 139         dev->features = phy_dev->features & IPVLAN_FEATURES;
 140         dev->features |= IPVLAN_ALWAYS_ON;
 141         dev->vlan_features = phy_dev->vlan_features & IPVLAN_FEATURES;
 142         dev->vlan_features |= IPVLAN_ALWAYS_ON_OFLOADS;
 143         dev->hw_enc_features |= dev->features;
 144         netif_inherit_tso_max(dev, phy_dev);
 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                 u64_stats_inc(&pcptr->tx_pkts);
 230                 u64_stats_add(&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(&pcptr->syncp);
 305                                 rx_pkts = u64_stats_read(&pcptr->rx_pkts);
 306                                 rx_bytes = u64_stats_read(&pcptr->rx_bytes);
 307                                 rx_mcast = u64_stats_read(&pcptr->rx_mcast);
 308                                 tx_pkts = u64_stats_read(&pcptr->tx_pkts);
 309                                 tx_bytes = u64_stats_read(&pcptr->tx_bytes);
 310                         } while (u64_stats_fetch_retry(&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 += READ_ONCE(pcptr->rx_errs);
 321                         tx_drps += READ_ONCE(pcptr->tx_drps);
 322                 }
 323                 s->rx_errors = rx_errs;
 324                 s->rx_dropped = rx_errs;
 325                 s->tx_dropped = tx_drps;
 326         }
 327         s->tx_errors = DEV_STATS_READ(dev, tx_errors);
 328 }
 329
 330 static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid)
 331 {
 332         struct ipvl_dev *ipvlan = netdev_priv(dev);
 333         struct net_device *phy_dev = ipvlan->phy_dev;
 334
 335         return vlan_vid_add(phy_dev, proto, vid);
 336 }
 337
 338 static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
 339                                    u16 vid)
 340 {
 341         struct ipvl_dev *ipvlan = netdev_priv(dev);
 342         struct net_device *phy_dev = ipvlan->phy_dev;
 343
 344         vlan_vid_del(phy_dev, proto, vid);
 345         return 0;
 346 }
 347
 348 static int ipvlan_get_iflink(const struct net_device *dev)
 349 {
 350         struct ipvl_dev *ipvlan = netdev_priv(dev);
 351
 352         return ipvlan->phy_dev->ifindex;
 353 }
 354
 355 static const struct net_device_ops ipvlan_netdev_ops = {
 356         .ndo_init               = ipvlan_init,
 357         .ndo_uninit             = ipvlan_uninit,
 358         .ndo_open               = ipvlan_open,
 359         .ndo_stop               = ipvlan_stop,
 360         .ndo_start_xmit         = ipvlan_start_xmit,
 361         .ndo_fix_features       = ipvlan_fix_features,
 362         .ndo_change_rx_flags    = ipvlan_change_rx_flags,
 363         .ndo_set_rx_mode        = ipvlan_set_multicast_mac_filter,
 364         .ndo_get_stats64        = ipvlan_get_stats64,
 365         .ndo_vlan_rx_add_vid    = ipvlan_vlan_rx_add_vid,
 366         .ndo_vlan_rx_kill_vid   = ipvlan_vlan_rx_kill_vid,
 367         .ndo_get_iflink         = ipvlan_get_iflink,
 368 };
 369
 370 static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
 371                               unsigned short type, const void *daddr,
 372                               const void *saddr, unsigned len)
 373 {
 374         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 375         struct net_device *phy_dev = ipvlan->phy_dev;
 376
 377         /* TODO Probably use a different field than dev_addr so that the
 378          * mac-address on the virtual device is portable and can be carried
 379          * while the packets use the mac-addr on the physical device.
 380          */
 381         return dev_hard_header(skb, phy_dev, type, daddr,
 382                                saddr ? : phy_dev->dev_addr, len);
 383 }
 384
 385 static const struct header_ops ipvlan_header_ops = {
 386         .create         = ipvlan_hard_header,
 387         .parse          = eth_header_parse,
 388         .cache          = eth_header_cache,
 389         .cache_update   = eth_header_cache_update,
 390 };
 391
 392 static void ipvlan_adjust_mtu(struct ipvl_dev *ipvlan, struct net_device *dev)
 393 {
 394         ipvlan->dev->mtu = dev->mtu;
 395 }
 396
 397 static bool netif_is_ipvlan(const struct net_device *dev)
 398 {
 399         /* both ipvlan and ipvtap devices use the same netdev_ops */
 400         return dev->netdev_ops == &ipvlan_netdev_ops;
 401 }
 402
 403 static int ipvlan_ethtool_get_link_ksettings(struct net_device *dev,
 404                                              struct ethtool_link_ksettings *cmd)
 405 {
 406         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 407
 408         return __ethtool_get_link_ksettings(ipvlan->phy_dev, cmd);
 409 }
 410
 411 static void ipvlan_ethtool_get_drvinfo(struct net_device *dev,
 412                                        struct ethtool_drvinfo *drvinfo)
 413 {
 414         strscpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver));
 415         strscpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version));
 416 }
 417
 418 static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev)
 419 {
 420         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 421
 422         return ipvlan->msg_enable;
 423 }
 424
 425 static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value)
 426 {
 427         struct ipvl_dev *ipvlan = netdev_priv(dev);
 428
 429         ipvlan->msg_enable = value;
 430 }
 431
 432 static const struct ethtool_ops ipvlan_ethtool_ops = {
 433         .get_link       = ethtool_op_get_link,
 434         .get_link_ksettings     = ipvlan_ethtool_get_link_ksettings,
 435         .get_drvinfo    = ipvlan_ethtool_get_drvinfo,
 436         .get_msglevel   = ipvlan_ethtool_get_msglevel,
 437         .set_msglevel   = ipvlan_ethtool_set_msglevel,
 438 };
 439
 440 static int ipvlan_nl_changelink(struct net_device *dev,
 441                                 struct nlattr *tb[], struct nlattr *data[],
 442                                 struct netlink_ext_ack *extack)
 443 {
 444         struct ipvl_dev *ipvlan = netdev_priv(dev);
 445         struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
 446         int err = 0;
 447
 448         if (!data)
 449                 return 0;
 450         if (!ns_capable(dev_net(ipvlan->phy_dev)->user_ns, CAP_NET_ADMIN))
 451                 return -EPERM;
 452
 453         if (data[IFLA_IPVLAN_MODE]) {
 454                 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
 455
 456                 err = ipvlan_set_port_mode(port, nmode, extack);
 457         }
 458
 459         if (!err && data[IFLA_IPVLAN_FLAGS]) {
 460                 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
 461
 462                 if (flags & IPVLAN_F_PRIVATE)
 463                         ipvlan_mark_private(port);
 464                 else
 465                         ipvlan_clear_private(port);
 466
 467                 if (flags & IPVLAN_F_VEPA)
 468                         ipvlan_mark_vepa(port);
 469                 else
 470                         ipvlan_clear_vepa(port);
 471         }
 472
 473         return err;
 474 }
 475
 476 static size_t ipvlan_nl_getsize(const struct net_device *dev)
 477 {
 478         return (0
 479                 + nla_total_size(2) /* IFLA_IPVLAN_MODE */
 480                 + nla_total_size(2) /* IFLA_IPVLAN_FLAGS */
 481                 );
 482 }
 483
 484 static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[],
 485                               struct netlink_ext_ack *extack)
 486 {
 487         if (!data)
 488                 return 0;
 489
 490         if (data[IFLA_IPVLAN_MODE]) {
 491                 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
 492
 493                 if (mode >= IPVLAN_MODE_MAX)
 494                         return -EINVAL;
 495         }
 496         if (data[IFLA_IPVLAN_FLAGS]) {
 497                 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
 498
 499                 /* Only two bits are used at this moment. */
 500                 if (flags & ~(IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
 501                         return -EINVAL;
 502                 /* Also both flags can't be active at the same time. */
 503                 if ((flags & (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) ==
 504                     (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
 505                         return -EINVAL;
 506         }
 507
 508         return 0;
 509 }
 510
 511 static int ipvlan_nl_fillinfo(struct sk_buff *skb,
 512                               const struct net_device *dev)
 513 {
 514         struct ipvl_dev *ipvlan = netdev_priv(dev);
 515         struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
 516         int ret = -EINVAL;
 517
 518         if (!port)
 519                 goto err;
 520
 521         ret = -EMSGSIZE;
 522         if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode))
 523                 goto err;
 524         if (nla_put_u16(skb, IFLA_IPVLAN_FLAGS, port->flags))
 525                 goto err;
 526
 527         return 0;
 528
 529 err:
 530         return ret;
 531 }
 532
 533 int ipvlan_link_new(struct net *src_net, struct net_device *dev,
 534                     struct nlattr *tb[], struct nlattr *data[],
 535                     struct netlink_ext_ack *extack)
 536 {
 537         struct ipvl_dev *ipvlan = netdev_priv(dev);
 538         struct ipvl_port *port;
 539         struct net_device *phy_dev;
 540         int err;
 541         u16 mode = IPVLAN_MODE_L3;
 542
 543         if (!tb[IFLA_LINK])
 544                 return -EINVAL;
 545
 546         phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
 547         if (!phy_dev)
 548                 return -ENODEV;
 549
 550         if (netif_is_ipvlan(phy_dev)) {
 551                 struct ipvl_dev *tmp = netdev_priv(phy_dev);
 552
 553                 phy_dev = tmp->phy_dev;
 554                 if (!ns_capable(dev_net(phy_dev)->user_ns, CAP_NET_ADMIN))
 555                         return -EPERM;
 556         } else if (!netif_is_ipvlan_port(phy_dev)) {
 557                 /* Exit early if the underlying link is invalid or busy */
 558                 if (phy_dev->type != ARPHRD_ETHER ||
 559                     phy_dev->flags & IFF_LOOPBACK) {
 560                         netdev_err(phy_dev,
 561                                    "Master is either lo or non-ether device\n");
 562                         return -EINVAL;
 563                 }
 564
 565                 if (netdev_is_rx_handler_busy(phy_dev)) {
 566                         netdev_err(phy_dev, "Device is already in use.\n");
 567                         return -EBUSY;
 568                 }
 569         }
 570
 571         ipvlan->phy_dev = phy_dev;
 572         ipvlan->dev = dev;
 573         ipvlan->sfeatures = IPVLAN_FEATURES;
 574         if (!tb[IFLA_MTU])
 575                 ipvlan_adjust_mtu(ipvlan, phy_dev);
 576         INIT_LIST_HEAD(&ipvlan->addrs);
 577         spin_lock_init(&ipvlan->addrs_lock);
 578
 579         /* TODO Probably put random address here to be presented to the
 580          * world but keep using the physical-dev address for the outgoing
 581          * packets.
 582          */
 583         eth_hw_addr_set(dev, phy_dev->dev_addr);
 584
 585         dev->priv_flags |= IFF_NO_RX_HANDLER;
 586
 587         err = register_netdevice(dev);
 588         if (err < 0)
 589                 return err;
 590
 591         /* ipvlan_init() would have created the port, if required */
 592         port = ipvlan_port_get_rtnl(phy_dev);
 593         ipvlan->port = port;
 594
 595         /* If the port-id base is at the MAX value, then wrap it around and
 596          * begin from 0x1 again. This may be due to a busy system where lots
 597          * of slaves are getting created and deleted.
 598          */
 599         if (port->dev_id_start == 0xFFFE)
 600                 port->dev_id_start = 0x1;
 601
 602         /* Since L2 address is shared among all IPvlan slaves including
 603          * master, use unique 16 bit dev-ids to diffentiate among them.
 604          * Assign IDs between 0x1 and 0xFFFE (used by the master) to each
 605          * slave link [see addrconf_ifid_eui48()].
 606          */
 607         err = ida_simple_get(&port->ida, port->dev_id_start, 0xFFFE,
 608                              GFP_KERNEL);
 609         if (err < 0)
 610                 err = ida_simple_get(&port->ida, 0x1, port->dev_id_start,
 611                                      GFP_KERNEL);
 612         if (err < 0)
 613                 goto unregister_netdev;
 614         dev->dev_id = err;
 615
 616         /* Increment id-base to the next slot for the future assignment */
 617         port->dev_id_start = err + 1;
 618
 619         err = netdev_upper_dev_link(phy_dev, dev, extack);
 620         if (err)
 621                 goto remove_ida;
 622
 623         /* Flags are per port and latest update overrides. User has
 624          * to be consistent in setting it just like the mode attribute.
 625          */
 626         if (data && data[IFLA_IPVLAN_FLAGS])
 627                 port->flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
 628
 629         if (data && data[IFLA_IPVLAN_MODE])
 630                 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
 631
 632         err = ipvlan_set_port_mode(port, mode, extack);
 633         if (err)
 634                 goto unlink_netdev;
 635
 636         list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans);
 637         netif_stacked_transfer_operstate(phy_dev, dev);
 638         return 0;
 639
 640 unlink_netdev:
 641         netdev_upper_dev_unlink(phy_dev, dev);
 642 remove_ida:
 643         ida_simple_remove(&port->ida, dev->dev_id);
 644 unregister_netdev:
 645         unregister_netdevice(dev);
 646         return err;
 647 }
 648 EXPORT_SYMBOL_GPL(ipvlan_link_new);
 649
 650 void ipvlan_link_delete(struct net_device *dev, struct list_head *head)
 651 {
 652         struct ipvl_dev *ipvlan = netdev_priv(dev);
 653         struct ipvl_addr *addr, *next;
 654
 655         spin_lock_bh(&ipvlan->addrs_lock);
 656         list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) {
 657                 ipvlan_ht_addr_del(addr);
 658                 list_del_rcu(&addr->anode);
 659                 kfree_rcu(addr, rcu);
 660         }
 661         spin_unlock_bh(&ipvlan->addrs_lock);
 662
 663         ida_simple_remove(&ipvlan->port->ida, dev->dev_id);
 664         list_del_rcu(&ipvlan->pnode);
 665         unregister_netdevice_queue(dev, head);
 666         netdev_upper_dev_unlink(ipvlan->phy_dev, dev);
 667 }
 668 EXPORT_SYMBOL_GPL(ipvlan_link_delete);
 669
 670 void ipvlan_link_setup(struct net_device *dev)
 671 {
 672         ether_setup(dev);
 673
 674         dev->max_mtu = ETH_MAX_MTU;
 675         dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
 676         dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE;
 677         dev->netdev_ops = &ipvlan_netdev_ops;
 678         dev->needs_free_netdev = true;
 679         dev->header_ops = &ipvlan_header_ops;
 680         dev->ethtool_ops = &ipvlan_ethtool_ops;
 681 }
 682 EXPORT_SYMBOL_GPL(ipvlan_link_setup);
 683
 684 static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] =
 685 {
 686         [IFLA_IPVLAN_MODE] = { .type = NLA_U16 },
 687         [IFLA_IPVLAN_FLAGS] = { .type = NLA_U16 },
 688 };
 689
 690 static struct net *ipvlan_get_link_net(const struct net_device *dev)
 691 {
 692         struct ipvl_dev *ipvlan = netdev_priv(dev);
 693
 694         return dev_net(ipvlan->phy_dev);
 695 }
 696
 697 static struct rtnl_link_ops ipvlan_link_ops = {
 698         .kind           = "ipvlan",
 699         .priv_size      = sizeof(struct ipvl_dev),
 700
 701         .setup          = ipvlan_link_setup,
 702         .newlink        = ipvlan_link_new,
 703         .dellink        = ipvlan_link_delete,
 704         .get_link_net   = ipvlan_get_link_net,
 705 };
 706
 707 int ipvlan_link_register(struct rtnl_link_ops *ops)
 708 {
 709         ops->get_size   = ipvlan_nl_getsize;
 710         ops->policy     = ipvlan_nl_policy;
 711         ops->validate   = ipvlan_nl_validate;
 712         ops->fill_info  = ipvlan_nl_fillinfo;
 713         ops->changelink = ipvlan_nl_changelink;
 714         ops->maxtype    = IFLA_IPVLAN_MAX;
 715         return rtnl_link_register(ops);
 716 }
 717 EXPORT_SYMBOL_GPL(ipvlan_link_register);
 718
 719 static int ipvlan_device_event(struct notifier_block *unused,
 720                                unsigned long event, void *ptr)
 721 {
 722         struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr);
 723         struct netdev_notifier_pre_changeaddr_info *prechaddr_info;
 724         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 725         struct ipvl_dev *ipvlan, *next;
 726         struct ipvl_port *port;
 727         LIST_HEAD(lst_kill);
 728         int err;
 729
 730         if (!netif_is_ipvlan_port(dev))
 731                 return NOTIFY_DONE;
 732
 733         port = ipvlan_port_get_rtnl(dev);
 734
 735         switch (event) {
 736         case NETDEV_UP:
 737         case NETDEV_CHANGE:
 738                 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
 739                         netif_stacked_transfer_operstate(ipvlan->phy_dev,
 740                                                          ipvlan->dev);
 741                 break;
 742
 743         case NETDEV_REGISTER: {
 744                 struct net *oldnet, *newnet = dev_net(dev);
 745
 746                 oldnet = read_pnet(&port->pnet);
 747                 if (net_eq(newnet, oldnet))
 748                         break;
 749
 750                 write_pnet(&port->pnet, newnet);
 751
 752                 if (port->mode == IPVLAN_MODE_L3S)
 753                         ipvlan_migrate_l3s_hook(oldnet, newnet);
 754                 break;
 755         }
 756         case NETDEV_UNREGISTER:
 757                 if (dev->reg_state != NETREG_UNREGISTERING)
 758                         break;
 759
 760                 list_for_each_entry_safe(ipvlan, next, &port->ipvlans, pnode)
 761                         ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev,
 762                                                             &lst_kill);
 763                 unregister_netdevice_many(&lst_kill);
 764                 break;
 765
 766         case NETDEV_FEAT_CHANGE:
 767                 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
 768                         netif_inherit_tso_max(ipvlan->dev, dev);
 769                         netdev_update_features(ipvlan->dev);
 770                 }
 771                 break;
 772
 773         case NETDEV_CHANGEMTU:
 774                 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
 775                         ipvlan_adjust_mtu(ipvlan, dev);
 776                 break;
 777
 778         case NETDEV_PRE_CHANGEADDR:
 779                 prechaddr_info = ptr;
 780                 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
 781                         err = dev_pre_changeaddr_notify(ipvlan->dev,
 782                                                     prechaddr_info->dev_addr,
 783                                                     extack);
 784                         if (err)
 785                                 return notifier_from_errno(err);
 786                 }
 787                 break;
 788
 789         case NETDEV_CHANGEADDR:
 790                 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
 791                         eth_hw_addr_set(ipvlan->dev, dev->dev_addr);
 792                         call_netdevice_notifiers(NETDEV_CHANGEADDR, ipvlan->dev);
 793                 }
 794                 break;
 795
 796         case NETDEV_PRE_TYPE_CHANGE:
 797                 /* Forbid underlying device to change its type. */
 798                 return NOTIFY_BAD;
 799         }
 800         return NOTIFY_DONE;
 801 }
 802
 803 /* the caller must held the addrs lock */
 804 static int ipvlan_add_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
 805 {
 806         struct ipvl_addr *addr;
 807
 808         addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC);
 809         if (!addr)
 810                 return -ENOMEM;
 811
 812         addr->master = ipvlan;
 813         if (!is_v6) {
 814                 memcpy(&addr->ip4addr, iaddr, sizeof(struct in_addr));
 815                 addr->atype = IPVL_IPV4;
 816 #if IS_ENABLED(CONFIG_IPV6)
 817         } else {
 818                 memcpy(&addr->ip6addr, iaddr, sizeof(struct in6_addr));
 819                 addr->atype = IPVL_IPV6;
 820 #endif
 821         }
 822
 823         list_add_tail_rcu(&addr->anode, &ipvlan->addrs);
 824
 825         /* If the interface is not up, the address will be added to the hash
 826          * list by ipvlan_open.
 827          */
 828         if (netif_running(ipvlan->dev))
 829                 ipvlan_ht_addr_add(ipvlan, addr);
 830
 831         return 0;
 832 }
 833
 834 static void ipvlan_del_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
 835 {
 836         struct ipvl_addr *addr;
 837
 838         spin_lock_bh(&ipvlan->addrs_lock);
 839         addr = ipvlan_find_addr(ipvlan, iaddr, is_v6);
 840         if (!addr) {
 841                 spin_unlock_bh(&ipvlan->addrs_lock);
 842                 return;
 843         }
 844
 845         ipvlan_ht_addr_del(addr);
 846         list_del_rcu(&addr->anode);
 847         spin_unlock_bh(&ipvlan->addrs_lock);
 848         kfree_rcu(addr, rcu);
 849 }
 850
 851 static bool ipvlan_is_valid_dev(const struct net_device *dev)
 852 {
 853         struct ipvl_dev *ipvlan = netdev_priv(dev);
 854
 855         if (!netif_is_ipvlan(dev))
 856                 return false;
 857
 858         if (!ipvlan || !ipvlan->port)
 859                 return false;
 860
 861         return true;
 862 }
 863
 864 #if IS_ENABLED(CONFIG_IPV6)
 865 static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
 866 {
 867         int ret = -EINVAL;
 868
 869         spin_lock_bh(&ipvlan->addrs_lock);
 870         if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true))
 871                 netif_err(ipvlan, ifup, ipvlan->dev,
 872                           "Failed to add IPv6=%pI6c addr for %s intf\n",
 873                           ip6_addr, ipvlan->dev->name);
 874         else
 875                 ret = ipvlan_add_addr(ipvlan, ip6_addr, true);
 876         spin_unlock_bh(&ipvlan->addrs_lock);
 877         return ret;
 878 }
 879
 880 static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
 881 {
 882         return ipvlan_del_addr(ipvlan, ip6_addr, true);
 883 }
 884
 885 static int ipvlan_addr6_event(struct notifier_block *unused,
 886                               unsigned long event, void *ptr)
 887 {
 888         struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr;
 889         struct net_device *dev = (struct net_device *)if6->idev->dev;
 890         struct ipvl_dev *ipvlan = netdev_priv(dev);
 891
 892         if (!ipvlan_is_valid_dev(dev))
 893                 return NOTIFY_DONE;
 894
 895         switch (event) {
 896         case NETDEV_UP:
 897                 if (ipvlan_add_addr6(ipvlan, &if6->addr))
 898                         return NOTIFY_BAD;
 899                 break;
 900
 901         case NETDEV_DOWN:
 902                 ipvlan_del_addr6(ipvlan, &if6->addr);
 903                 break;
 904         }
 905
 906         return NOTIFY_OK;
 907 }
 908
 909 static int ipvlan_addr6_validator_event(struct notifier_block *unused,
 910                                         unsigned long event, void *ptr)
 911 {
 912         struct in6_validator_info *i6vi = (struct in6_validator_info *)ptr;
 913         struct net_device *dev = (struct net_device *)i6vi->i6vi_dev->dev;
 914         struct ipvl_dev *ipvlan = netdev_priv(dev);
 915
 916         if (!ipvlan_is_valid_dev(dev))
 917                 return NOTIFY_DONE;
 918
 919         switch (event) {
 920         case NETDEV_UP:
 921                 if (ipvlan_addr_busy(ipvlan->port, &i6vi->i6vi_addr, true)) {
 922                         NL_SET_ERR_MSG(i6vi->extack,
 923                                        "Address already assigned to an ipvlan device");
 924                         return notifier_from_errno(-EADDRINUSE);
 925                 }
 926                 break;
 927         }
 928
 929         return NOTIFY_OK;
 930 }
 931 #endif
 932
 933 static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
 934 {
 935         int ret = -EINVAL;
 936
 937         spin_lock_bh(&ipvlan->addrs_lock);
 938         if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false))
 939                 netif_err(ipvlan, ifup, ipvlan->dev,
 940                           "Failed to add IPv4=%pI4 on %s intf.\n",
 941                           ip4_addr, ipvlan->dev->name);
 942         else
 943                 ret = ipvlan_add_addr(ipvlan, ip4_addr, false);
 944         spin_unlock_bh(&ipvlan->addrs_lock);
 945         return ret;
 946 }
 947
 948 static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
 949 {
 950         return ipvlan_del_addr(ipvlan, ip4_addr, false);
 951 }
 952
 953 static int ipvlan_addr4_event(struct notifier_block *unused,
 954                               unsigned long event, void *ptr)
 955 {
 956         struct in_ifaddr *if4 = (struct in_ifaddr *)ptr;
 957         struct net_device *dev = (struct net_device *)if4->ifa_dev->dev;
 958         struct ipvl_dev *ipvlan = netdev_priv(dev);
 959         struct in_addr ip4_addr;
 960
 961         if (!ipvlan_is_valid_dev(dev))
 962                 return NOTIFY_DONE;
 963
 964         switch (event) {
 965         case NETDEV_UP:
 966                 ip4_addr.s_addr = if4->ifa_address;
 967                 if (ipvlan_add_addr4(ipvlan, &ip4_addr))
 968                         return NOTIFY_BAD;
 969                 break;
 970
 971         case NETDEV_DOWN:
 972                 ip4_addr.s_addr = if4->ifa_address;
 973                 ipvlan_del_addr4(ipvlan, &ip4_addr);
 974                 break;
 975         }
 976
 977         return NOTIFY_OK;
 978 }
 979
 980 static int ipvlan_addr4_validator_event(struct notifier_block *unused,
 981                                         unsigned long event, void *ptr)
 982 {
 983         struct in_validator_info *ivi = (struct in_validator_info *)ptr;
 984         struct net_device *dev = (struct net_device *)ivi->ivi_dev->dev;
 985         struct ipvl_dev *ipvlan = netdev_priv(dev);
 986
 987         if (!ipvlan_is_valid_dev(dev))
 988                 return NOTIFY_DONE;
 989
 990         switch (event) {
 991         case NETDEV_UP:
 992                 if (ipvlan_addr_busy(ipvlan->port, &ivi->ivi_addr, false)) {
 993                         NL_SET_ERR_MSG(ivi->extack,
 994                                        "Address already assigned to an ipvlan device");
 995                         return notifier_from_errno(-EADDRINUSE);
 996                 }
 997                 break;
 998         }
 999
1000         return NOTIFY_OK;
1001 }
1002
1003 static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = {
1004         .notifier_call = ipvlan_addr4_event,
1005 };
1006
1007 static struct notifier_block ipvlan_addr4_vtor_notifier_block __read_mostly = {
1008         .notifier_call = ipvlan_addr4_validator_event,
1009 };
1010
1011 static struct notifier_block ipvlan_notifier_block __read_mostly = {
1012         .notifier_call = ipvlan_device_event,
1013 };
1014
1015 #if IS_ENABLED(CONFIG_IPV6)
1016 static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = {
1017         .notifier_call = ipvlan_addr6_event,
1018 };
1019
1020 static struct notifier_block ipvlan_addr6_vtor_notifier_block __read_mostly = {
1021         .notifier_call = ipvlan_addr6_validator_event,
1022 };
1023 #endif
1024
1025 static int __init ipvlan_init_module(void)
1026 {
1027         int err;
1028
1029         ipvlan_init_secret();
1030         register_netdevice_notifier(&ipvlan_notifier_block);
1031 #if IS_ENABLED(CONFIG_IPV6)
1032         register_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1033         register_inet6addr_validator_notifier(
1034             &ipvlan_addr6_vtor_notifier_block);
1035 #endif
1036         register_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1037         register_inetaddr_validator_notifier(&ipvlan_addr4_vtor_notifier_block);
1038
1039         err = ipvlan_l3s_init();
1040         if (err < 0)
1041                 goto error;
1042
1043         err = ipvlan_link_register(&ipvlan_link_ops);
1044         if (err < 0) {
1045                 ipvlan_l3s_cleanup();
1046                 goto error;
1047         }
1048
1049         return 0;
1050 error:
1051         unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1052         unregister_inetaddr_validator_notifier(
1053             &ipvlan_addr4_vtor_notifier_block);
1054 #if IS_ENABLED(CONFIG_IPV6)
1055         unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1056         unregister_inet6addr_validator_notifier(
1057             &ipvlan_addr6_vtor_notifier_block);
1058 #endif
1059         unregister_netdevice_notifier(&ipvlan_notifier_block);
1060         return err;
1061 }
1062
1063 static void __exit ipvlan_cleanup_module(void)
1064 {
1065         rtnl_link_unregister(&ipvlan_link_ops);
1066         ipvlan_l3s_cleanup();
1067         unregister_netdevice_notifier(&ipvlan_notifier_block);
1068         unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1069         unregister_inetaddr_validator_notifier(
1070             &ipvlan_addr4_vtor_notifier_block);
1071 #if IS_ENABLED(CONFIG_IPV6)
1072         unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1073         unregister_inet6addr_validator_notifier(
1074             &ipvlan_addr6_vtor_notifier_block);
1075 #endif
1076 }
1077
1078 module_init(ipvlan_init_module);
1079 module_exit(ipvlan_cleanup_module);
1080
1081 MODULE_LICENSE("GPL");
1082 MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>");
1083 MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs");
1084 MODULE_ALIAS_RTNL_LINK("ipvlan");