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         .parse_protocol = eth_header_parse_protocol,
 391 };
 392
 393 static void ipvlan_adjust_mtu(struct ipvl_dev *ipvlan, struct net_device *dev)
 394 {
 395         ipvlan->dev->mtu = dev->mtu;
 396 }
 397
 398 static bool netif_is_ipvlan(const struct net_device *dev)
 399 {
 400         /* both ipvlan and ipvtap devices use the same netdev_ops */
 401         return dev->netdev_ops == &ipvlan_netdev_ops;
 402 }
 403
 404 static int ipvlan_ethtool_get_link_ksettings(struct net_device *dev,
 405                                              struct ethtool_link_ksettings *cmd)
 406 {
 407         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 408
 409         return __ethtool_get_link_ksettings(ipvlan->phy_dev, cmd);
 410 }
 411
 412 static void ipvlan_ethtool_get_drvinfo(struct net_device *dev,
 413                                        struct ethtool_drvinfo *drvinfo)
 414 {
 415         strscpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver));
 416         strscpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version));
 417 }
 418
 419 static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev)
 420 {
 421         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 422
 423         return ipvlan->msg_enable;
 424 }
 425
 426 static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value)
 427 {
 428         struct ipvl_dev *ipvlan = netdev_priv(dev);
 429
 430         ipvlan->msg_enable = value;
 431 }
 432
 433 static const struct ethtool_ops ipvlan_ethtool_ops = {
 434         .get_link       = ethtool_op_get_link,
 435         .get_link_ksettings     = ipvlan_ethtool_get_link_ksettings,
 436         .get_drvinfo    = ipvlan_ethtool_get_drvinfo,
 437         .get_msglevel   = ipvlan_ethtool_get_msglevel,
 438         .set_msglevel   = ipvlan_ethtool_set_msglevel,
 439 };
 440
 441 static int ipvlan_nl_changelink(struct net_device *dev,
 442                                 struct nlattr *tb[], struct nlattr *data[],
 443                                 struct netlink_ext_ack *extack)
 444 {
 445         struct ipvl_dev *ipvlan = netdev_priv(dev);
 446         struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
 447         int err = 0;
 448
 449         if (!data)
 450                 return 0;
 451         if (!ns_capable(dev_net(ipvlan->phy_dev)->user_ns, CAP_NET_ADMIN))
 452                 return -EPERM;
 453
 454         if (data[IFLA_IPVLAN_MODE]) {
 455                 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
 456
 457                 err = ipvlan_set_port_mode(port, nmode, extack);
 458         }
 459
 460         if (!err && data[IFLA_IPVLAN_FLAGS]) {
 461                 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
 462
 463                 if (flags & IPVLAN_F_PRIVATE)
 464                         ipvlan_mark_private(port);
 465                 else
 466                         ipvlan_clear_private(port);
 467
 468                 if (flags & IPVLAN_F_VEPA)
 469                         ipvlan_mark_vepa(port);
 470                 else
 471                         ipvlan_clear_vepa(port);
 472         }
 473
 474         return err;
 475 }
 476
 477 static size_t ipvlan_nl_getsize(const struct net_device *dev)
 478 {
 479         return (0
 480                 + nla_total_size(2) /* IFLA_IPVLAN_MODE */
 481                 + nla_total_size(2) /* IFLA_IPVLAN_FLAGS */
 482                 );
 483 }
 484
 485 static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[],
 486                               struct netlink_ext_ack *extack)
 487 {
 488         if (!data)
 489                 return 0;
 490
 491         if (data[IFLA_IPVLAN_MODE]) {
 492                 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
 493
 494                 if (mode >= IPVLAN_MODE_MAX)
 495                         return -EINVAL;
 496         }
 497         if (data[IFLA_IPVLAN_FLAGS]) {
 498                 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
 499
 500                 /* Only two bits are used at this moment. */
 501                 if (flags & ~(IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
 502                         return -EINVAL;
 503                 /* Also both flags can't be active at the same time. */
 504                 if ((flags & (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) ==
 505                     (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
 506                         return -EINVAL;
 507         }
 508
 509         return 0;
 510 }
 511
 512 static int ipvlan_nl_fillinfo(struct sk_buff *skb,
 513                               const struct net_device *dev)
 514 {
 515         struct ipvl_dev *ipvlan = netdev_priv(dev);
 516         struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
 517         int ret = -EINVAL;
 518
 519         if (!port)
 520                 goto err;
 521
 522         ret = -EMSGSIZE;
 523         if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode))
 524                 goto err;
 525         if (nla_put_u16(skb, IFLA_IPVLAN_FLAGS, port->flags))
 526                 goto err;
 527
 528         return 0;
 529
 530 err:
 531         return ret;
 532 }
 533
 534 int ipvlan_link_new(struct net *src_net, struct net_device *dev,
 535                     struct nlattr *tb[], struct nlattr *data[],
 536                     struct netlink_ext_ack *extack)
 537 {
 538         struct ipvl_dev *ipvlan = netdev_priv(dev);
 539         struct ipvl_port *port;
 540         struct net_device *phy_dev;
 541         int err;
 542         u16 mode = IPVLAN_MODE_L3;
 543
 544         if (!tb[IFLA_LINK])
 545                 return -EINVAL;
 546
 547         phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
 548         if (!phy_dev)
 549                 return -ENODEV;
 550
 551         if (netif_is_ipvlan(phy_dev)) {
 552                 struct ipvl_dev *tmp = netdev_priv(phy_dev);
 553
 554                 phy_dev = tmp->phy_dev;
 555                 if (!ns_capable(dev_net(phy_dev)->user_ns, CAP_NET_ADMIN))
 556                         return -EPERM;
 557         } else if (!netif_is_ipvlan_port(phy_dev)) {
 558                 /* Exit early if the underlying link is invalid or busy */
 559                 if (phy_dev->type != ARPHRD_ETHER ||
 560                     phy_dev->flags & IFF_LOOPBACK) {
 561                         netdev_err(phy_dev,
 562                                    "Master is either lo or non-ether device\n");
 563                         return -EINVAL;
 564                 }
 565
 566                 if (netdev_is_rx_handler_busy(phy_dev)) {
 567                         netdev_err(phy_dev, "Device is already in use.\n");
 568                         return -EBUSY;
 569                 }
 570         }
 571
 572         ipvlan->phy_dev = phy_dev;
 573         ipvlan->dev = dev;
 574         ipvlan->sfeatures = IPVLAN_FEATURES;
 575         if (!tb[IFLA_MTU])
 576                 ipvlan_adjust_mtu(ipvlan, phy_dev);
 577         INIT_LIST_HEAD(&ipvlan->addrs);
 578         spin_lock_init(&ipvlan->addrs_lock);
 579
 580         /* TODO Probably put random address here to be presented to the
 581          * world but keep using the physical-dev address for the outgoing
 582          * packets.
 583          */
 584         eth_hw_addr_set(dev, phy_dev->dev_addr);
 585
 586         dev->priv_flags |= IFF_NO_RX_HANDLER;
 587
 588         err = register_netdevice(dev);
 589         if (err < 0)
 590                 return err;
 591
 592         /* ipvlan_init() would have created the port, if required */
 593         port = ipvlan_port_get_rtnl(phy_dev);
 594         ipvlan->port = port;
 595
 596         /* If the port-id base is at the MAX value, then wrap it around and
 597          * begin from 0x1 again. This may be due to a busy system where lots
 598          * of slaves are getting created and deleted.
 599          */
 600         if (port->dev_id_start == 0xFFFE)
 601                 port->dev_id_start = 0x1;
 602
 603         /* Since L2 address is shared among all IPvlan slaves including
 604          * master, use unique 16 bit dev-ids to differentiate among them.
 605          * Assign IDs between 0x1 and 0xFFFE (used by the master) to each
 606          * slave link [see addrconf_ifid_eui48()].
 607          */
 608         err = ida_alloc_range(&port->ida, port->dev_id_start, 0xFFFD,
 609                               GFP_KERNEL);
 610         if (err < 0)
 611                 err = ida_alloc_range(&port->ida, 0x1, port->dev_id_start - 1,
 612                                       GFP_KERNEL);
 613         if (err < 0)
 614                 goto unregister_netdev;
 615         dev->dev_id = err;
 616
 617         /* Increment id-base to the next slot for the future assignment */
 618         port->dev_id_start = err + 1;
 619
 620         err = netdev_upper_dev_link(phy_dev, dev, extack);
 621         if (err)
 622                 goto remove_ida;
 623
 624         /* Flags are per port and latest update overrides. User has
 625          * to be consistent in setting it just like the mode attribute.
 626          */
 627         if (data && data[IFLA_IPVLAN_FLAGS])
 628                 port->flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
 629
 630         if (data && data[IFLA_IPVLAN_MODE])
 631                 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
 632
 633         err = ipvlan_set_port_mode(port, mode, extack);
 634         if (err)
 635                 goto unlink_netdev;
 636
 637         list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans);
 638         netif_stacked_transfer_operstate(phy_dev, dev);
 639         return 0;
 640
 641 unlink_netdev:
 642         netdev_upper_dev_unlink(phy_dev, dev);
 643 remove_ida:
 644         ida_free(&port->ida, dev->dev_id);
 645 unregister_netdev:
 646         unregister_netdevice(dev);
 647         return err;
 648 }
 649 EXPORT_SYMBOL_GPL(ipvlan_link_new);
 650
 651 void ipvlan_link_delete(struct net_device *dev, struct list_head *head)
 652 {
 653         struct ipvl_dev *ipvlan = netdev_priv(dev);
 654         struct ipvl_addr *addr, *next;
 655
 656         spin_lock_bh(&ipvlan->addrs_lock);
 657         list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) {
 658                 ipvlan_ht_addr_del(addr);
 659                 list_del_rcu(&addr->anode);
 660                 kfree_rcu(addr, rcu);
 661         }
 662         spin_unlock_bh(&ipvlan->addrs_lock);
 663
 664         ida_free(&ipvlan->port->ida, dev->dev_id);
 665         list_del_rcu(&ipvlan->pnode);
 666         unregister_netdevice_queue(dev, head);
 667         netdev_upper_dev_unlink(ipvlan->phy_dev, dev);
 668 }
 669 EXPORT_SYMBOL_GPL(ipvlan_link_delete);
 670
 671 void ipvlan_link_setup(struct net_device *dev)
 672 {
 673         ether_setup(dev);
 674
 675         dev->max_mtu = ETH_MAX_MTU;
 676         dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
 677         dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE;
 678         dev->netdev_ops = &ipvlan_netdev_ops;
 679         dev->needs_free_netdev = true;
 680         dev->header_ops = &ipvlan_header_ops;
 681         dev->ethtool_ops = &ipvlan_ethtool_ops;
 682 }
 683 EXPORT_SYMBOL_GPL(ipvlan_link_setup);
 684
 685 static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] =
 686 {
 687         [IFLA_IPVLAN_MODE] = { .type = NLA_U16 },
 688         [IFLA_IPVLAN_FLAGS] = { .type = NLA_U16 },
 689 };
 690
 691 static struct net *ipvlan_get_link_net(const struct net_device *dev)
 692 {
 693         struct ipvl_dev *ipvlan = netdev_priv(dev);
 694
 695         return dev_net(ipvlan->phy_dev);
 696 }
 697
 698 static struct rtnl_link_ops ipvlan_link_ops = {
 699         .kind           = "ipvlan",
 700         .priv_size      = sizeof(struct ipvl_dev),
 701
 702         .setup          = ipvlan_link_setup,
 703         .newlink        = ipvlan_link_new,
 704         .dellink        = ipvlan_link_delete,
 705         .get_link_net   = ipvlan_get_link_net,
 706 };
 707
 708 int ipvlan_link_register(struct rtnl_link_ops *ops)
 709 {
 710         ops->get_size   = ipvlan_nl_getsize;
 711         ops->policy     = ipvlan_nl_policy;
 712         ops->validate   = ipvlan_nl_validate;
 713         ops->fill_info  = ipvlan_nl_fillinfo;
 714         ops->changelink = ipvlan_nl_changelink;
 715         ops->maxtype    = IFLA_IPVLAN_MAX;
 716         return rtnl_link_register(ops);
 717 }
 718 EXPORT_SYMBOL_GPL(ipvlan_link_register);
 719
 720 static int ipvlan_device_event(struct notifier_block *unused,
 721                                unsigned long event, void *ptr)
 722 {
 723         struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr);
 724         struct netdev_notifier_pre_changeaddr_info *prechaddr_info;
 725         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 726         struct ipvl_dev *ipvlan, *next;
 727         struct ipvl_port *port;
 728         LIST_HEAD(lst_kill);
 729         int err;
 730
 731         if (!netif_is_ipvlan_port(dev))
 732                 return NOTIFY_DONE;
 733
 734         port = ipvlan_port_get_rtnl(dev);
 735
 736         switch (event) {
 737         case NETDEV_UP:
 738         case NETDEV_CHANGE:
 739                 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
 740                         netif_stacked_transfer_operstate(ipvlan->phy_dev,
 741                                                          ipvlan->dev);
 742                 break;
 743
 744         case NETDEV_REGISTER: {
 745                 struct net *oldnet, *newnet = dev_net(dev);
 746
 747                 oldnet = read_pnet(&port->pnet);
 748                 if (net_eq(newnet, oldnet))
 749                         break;
 750
 751                 write_pnet(&port->pnet, newnet);
 752
 753                 if (port->mode == IPVLAN_MODE_L3S)
 754                         ipvlan_migrate_l3s_hook(oldnet, newnet);
 755                 break;
 756         }
 757         case NETDEV_UNREGISTER:
 758                 if (dev->reg_state != NETREG_UNREGISTERING)
 759                         break;
 760
 761                 list_for_each_entry_safe(ipvlan, next, &port->ipvlans, pnode)
 762                         ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev,
 763                                                             &lst_kill);
 764                 unregister_netdevice_many(&lst_kill);
 765                 break;
 766
 767         case NETDEV_FEAT_CHANGE:
 768                 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
 769                         netif_inherit_tso_max(ipvlan->dev, dev);
 770                         netdev_update_features(ipvlan->dev);
 771                 }
 772                 break;
 773
 774         case NETDEV_CHANGEMTU:
 775                 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
 776                         ipvlan_adjust_mtu(ipvlan, dev);
 777                 break;
 778
 779         case NETDEV_PRE_CHANGEADDR:
 780                 prechaddr_info = ptr;
 781                 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
 782                         err = dev_pre_changeaddr_notify(ipvlan->dev,
 783                                                     prechaddr_info->dev_addr,
 784                                                     extack);
 785                         if (err)
 786                                 return notifier_from_errno(err);
 787                 }
 788                 break;
 789
 790         case NETDEV_CHANGEADDR:
 791                 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
 792                         eth_hw_addr_set(ipvlan->dev, dev->dev_addr);
 793                         call_netdevice_notifiers(NETDEV_CHANGEADDR, ipvlan->dev);
 794                 }
 795                 break;
 796
 797         case NETDEV_PRE_TYPE_CHANGE:
 798                 /* Forbid underlying device to change its type. */
 799                 return NOTIFY_BAD;
 800         }
 801         return NOTIFY_DONE;
 802 }
 803
 804 /* the caller must held the addrs lock */
 805 static int ipvlan_add_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
 806 {
 807         struct ipvl_addr *addr;
 808
 809         addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC);
 810         if (!addr)
 811                 return -ENOMEM;
 812
 813         addr->master = ipvlan;
 814         if (!is_v6) {
 815                 memcpy(&addr->ip4addr, iaddr, sizeof(struct in_addr));
 816                 addr->atype = IPVL_IPV4;
 817 #if IS_ENABLED(CONFIG_IPV6)
 818         } else {
 819                 memcpy(&addr->ip6addr, iaddr, sizeof(struct in6_addr));
 820                 addr->atype = IPVL_IPV6;
 821 #endif
 822         }
 823
 824         list_add_tail_rcu(&addr->anode, &ipvlan->addrs);
 825
 826         /* If the interface is not up, the address will be added to the hash
 827          * list by ipvlan_open.
 828          */
 829         if (netif_running(ipvlan->dev))
 830                 ipvlan_ht_addr_add(ipvlan, addr);
 831
 832         return 0;
 833 }
 834
 835 static void ipvlan_del_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
 836 {
 837         struct ipvl_addr *addr;
 838
 839         spin_lock_bh(&ipvlan->addrs_lock);
 840         addr = ipvlan_find_addr(ipvlan, iaddr, is_v6);
 841         if (!addr) {
 842                 spin_unlock_bh(&ipvlan->addrs_lock);
 843                 return;
 844         }
 845
 846         ipvlan_ht_addr_del(addr);
 847         list_del_rcu(&addr->anode);
 848         spin_unlock_bh(&ipvlan->addrs_lock);
 849         kfree_rcu(addr, rcu);
 850 }
 851
 852 static bool ipvlan_is_valid_dev(const struct net_device *dev)
 853 {
 854         struct ipvl_dev *ipvlan = netdev_priv(dev);
 855
 856         if (!netif_is_ipvlan(dev))
 857                 return false;
 858
 859         if (!ipvlan || !ipvlan->port)
 860                 return false;
 861
 862         return true;
 863 }
 864
 865 #if IS_ENABLED(CONFIG_IPV6)
 866 static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
 867 {
 868         int ret = -EINVAL;
 869
 870         spin_lock_bh(&ipvlan->addrs_lock);
 871         if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true))
 872                 netif_err(ipvlan, ifup, ipvlan->dev,
 873                           "Failed to add IPv6=%pI6c addr for %s intf\n",
 874                           ip6_addr, ipvlan->dev->name);
 875         else
 876                 ret = ipvlan_add_addr(ipvlan, ip6_addr, true);
 877         spin_unlock_bh(&ipvlan->addrs_lock);
 878         return ret;
 879 }
 880
 881 static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
 882 {
 883         return ipvlan_del_addr(ipvlan, ip6_addr, true);
 884 }
 885
 886 static int ipvlan_addr6_event(struct notifier_block *unused,
 887                               unsigned long event, void *ptr)
 888 {
 889         struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr;
 890         struct net_device *dev = (struct net_device *)if6->idev->dev;
 891         struct ipvl_dev *ipvlan = netdev_priv(dev);
 892
 893         if (!ipvlan_is_valid_dev(dev))
 894                 return NOTIFY_DONE;
 895
 896         switch (event) {
 897         case NETDEV_UP:
 898                 if (ipvlan_add_addr6(ipvlan, &if6->addr))
 899                         return NOTIFY_BAD;
 900                 break;
 901
 902         case NETDEV_DOWN:
 903                 ipvlan_del_addr6(ipvlan, &if6->addr);
 904                 break;
 905         }
 906
 907         return NOTIFY_OK;
 908 }
 909
 910 static int ipvlan_addr6_validator_event(struct notifier_block *unused,
 911                                         unsigned long event, void *ptr)
 912 {
 913         struct in6_validator_info *i6vi = (struct in6_validator_info *)ptr;
 914         struct net_device *dev = (struct net_device *)i6vi->i6vi_dev->dev;
 915         struct ipvl_dev *ipvlan = netdev_priv(dev);
 916
 917         if (!ipvlan_is_valid_dev(dev))
 918                 return NOTIFY_DONE;
 919
 920         switch (event) {
 921         case NETDEV_UP:
 922                 if (ipvlan_addr_busy(ipvlan->port, &i6vi->i6vi_addr, true)) {
 923                         NL_SET_ERR_MSG(i6vi->extack,
 924                                        "Address already assigned to an ipvlan device");
 925                         return notifier_from_errno(-EADDRINUSE);
 926                 }
 927                 break;
 928         }
 929
 930         return NOTIFY_OK;
 931 }
 932 #endif
 933
 934 static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
 935 {
 936         int ret = -EINVAL;
 937
 938         spin_lock_bh(&ipvlan->addrs_lock);
 939         if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false))
 940                 netif_err(ipvlan, ifup, ipvlan->dev,
 941                           "Failed to add IPv4=%pI4 on %s intf.\n",
 942                           ip4_addr, ipvlan->dev->name);
 943         else
 944                 ret = ipvlan_add_addr(ipvlan, ip4_addr, false);
 945         spin_unlock_bh(&ipvlan->addrs_lock);
 946         return ret;
 947 }
 948
 949 static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
 950 {
 951         return ipvlan_del_addr(ipvlan, ip4_addr, false);
 952 }
 953
 954 static int ipvlan_addr4_event(struct notifier_block *unused,
 955                               unsigned long event, void *ptr)
 956 {
 957         struct in_ifaddr *if4 = (struct in_ifaddr *)ptr;
 958         struct net_device *dev = (struct net_device *)if4->ifa_dev->dev;
 959         struct ipvl_dev *ipvlan = netdev_priv(dev);
 960         struct in_addr ip4_addr;
 961
 962         if (!ipvlan_is_valid_dev(dev))
 963                 return NOTIFY_DONE;
 964
 965         switch (event) {
 966         case NETDEV_UP:
 967                 ip4_addr.s_addr = if4->ifa_address;
 968                 if (ipvlan_add_addr4(ipvlan, &ip4_addr))
 969                         return NOTIFY_BAD;
 970                 break;
 971
 972         case NETDEV_DOWN:
 973                 ip4_addr.s_addr = if4->ifa_address;
 974                 ipvlan_del_addr4(ipvlan, &ip4_addr);
 975                 break;
 976         }
 977
 978         return NOTIFY_OK;
 979 }
 980
 981 static int ipvlan_addr4_validator_event(struct notifier_block *unused,
 982                                         unsigned long event, void *ptr)
 983 {
 984         struct in_validator_info *ivi = (struct in_validator_info *)ptr;
 985         struct net_device *dev = (struct net_device *)ivi->ivi_dev->dev;
 986         struct ipvl_dev *ipvlan = netdev_priv(dev);
 987
 988         if (!ipvlan_is_valid_dev(dev))
 989                 return NOTIFY_DONE;
 990
 991         switch (event) {
 992         case NETDEV_UP:
 993                 if (ipvlan_addr_busy(ipvlan->port, &ivi->ivi_addr, false)) {
 994                         NL_SET_ERR_MSG(ivi->extack,
 995                                        "Address already assigned to an ipvlan device");
 996                         return notifier_from_errno(-EADDRINUSE);
 997                 }
 998                 break;
 999         }
1000
1001         return NOTIFY_OK;
1002 }
1003
1004 static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = {
1005         .notifier_call = ipvlan_addr4_event,
1006 };
1007
1008 static struct notifier_block ipvlan_addr4_vtor_notifier_block __read_mostly = {
1009         .notifier_call = ipvlan_addr4_validator_event,
1010 };
1011
1012 static struct notifier_block ipvlan_notifier_block __read_mostly = {
1013         .notifier_call = ipvlan_device_event,
1014 };
1015
1016 #if IS_ENABLED(CONFIG_IPV6)
1017 static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = {
1018         .notifier_call = ipvlan_addr6_event,
1019 };
1020
1021 static struct notifier_block ipvlan_addr6_vtor_notifier_block __read_mostly = {
1022         .notifier_call = ipvlan_addr6_validator_event,
1023 };
1024 #endif
1025
1026 static int __init ipvlan_init_module(void)
1027 {
1028         int err;
1029
1030         ipvlan_init_secret();
1031         register_netdevice_notifier(&ipvlan_notifier_block);
1032 #if IS_ENABLED(CONFIG_IPV6)
1033         register_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1034         register_inet6addr_validator_notifier(
1035             &ipvlan_addr6_vtor_notifier_block);
1036 #endif
1037         register_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1038         register_inetaddr_validator_notifier(&ipvlan_addr4_vtor_notifier_block);
1039
1040         err = ipvlan_l3s_init();
1041         if (err < 0)
1042                 goto error;
1043
1044         err = ipvlan_link_register(&ipvlan_link_ops);
1045         if (err < 0) {
1046                 ipvlan_l3s_cleanup();
1047                 goto error;
1048         }
1049
1050         return 0;
1051 error:
1052         unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1053         unregister_inetaddr_validator_notifier(
1054             &ipvlan_addr4_vtor_notifier_block);
1055 #if IS_ENABLED(CONFIG_IPV6)
1056         unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1057         unregister_inet6addr_validator_notifier(
1058             &ipvlan_addr6_vtor_notifier_block);
1059 #endif
1060         unregister_netdevice_notifier(&ipvlan_notifier_block);
1061         return err;
1062 }
1063
1064 static void __exit ipvlan_cleanup_module(void)
1065 {
1066         rtnl_link_unregister(&ipvlan_link_ops);
1067         ipvlan_l3s_cleanup();
1068         unregister_netdevice_notifier(&ipvlan_notifier_block);
1069         unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1070         unregister_inetaddr_validator_notifier(
1071             &ipvlan_addr4_vtor_notifier_block);
1072 #if IS_ENABLED(CONFIG_IPV6)
1073         unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1074         unregister_inet6addr_validator_notifier(
1075             &ipvlan_addr6_vtor_notifier_block);
1076 #endif
1077 }
1078
1079 module_init(ipvlan_init_module);
1080 module_exit(ipvlan_cleanup_module);
1081
1082 MODULE_LICENSE("GPL");
1083 MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>");
1084 MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs");
1085 MODULE_ALIAS_RTNL_LINK("ipvlan");