drivers/net/ipvlan/ipvlan_main.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /* Copyright (c) 2014 Mahesh Bandewar <[email protected]>
   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_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         dev->lltx = true;
 145         netif_inherit_tso_max(dev, phy_dev);
 146         dev->hard_header_len = phy_dev->hard_header_len;
 147
 148         netdev_lockdep_set_classes(dev);
 149
 150         ipvlan->pcpu_stats = netdev_alloc_pcpu_stats(struct ipvl_pcpu_stats);
 151         if (!ipvlan->pcpu_stats)
 152                 return -ENOMEM;
 153
 154         if (!netif_is_ipvlan_port(phy_dev)) {
 155                 err = ipvlan_port_create(phy_dev);
 156                 if (err < 0) {
 157                         free_percpu(ipvlan->pcpu_stats);
 158                         return err;
 159                 }
 160         }
 161         port = ipvlan_port_get_rtnl(phy_dev);
 162         port->count += 1;
 163         return 0;
 164 }
 165
 166 static void ipvlan_uninit(struct net_device *dev)
 167 {
 168         struct ipvl_dev *ipvlan = netdev_priv(dev);
 169         struct net_device *phy_dev = ipvlan->phy_dev;
 170         struct ipvl_port *port;
 171
 172         free_percpu(ipvlan->pcpu_stats);
 173
 174         port = ipvlan_port_get_rtnl(phy_dev);
 175         port->count -= 1;
 176         if (!port->count)
 177                 ipvlan_port_destroy(port->dev);
 178 }
 179
 180 static int ipvlan_open(struct net_device *dev)
 181 {
 182         struct ipvl_dev *ipvlan = netdev_priv(dev);
 183         struct ipvl_addr *addr;
 184
 185         if (ipvlan->port->mode == IPVLAN_MODE_L3 ||
 186             ipvlan->port->mode == IPVLAN_MODE_L3S)
 187                 dev->flags |= IFF_NOARP;
 188         else
 189                 dev->flags &= ~IFF_NOARP;
 190
 191         rcu_read_lock();
 192         list_for_each_entry_rcu(addr, &ipvlan->addrs, anode)
 193                 ipvlan_ht_addr_add(ipvlan, addr);
 194         rcu_read_unlock();
 195
 196         return 0;
 197 }
 198
 199 static int ipvlan_stop(struct net_device *dev)
 200 {
 201         struct ipvl_dev *ipvlan = netdev_priv(dev);
 202         struct net_device *phy_dev = ipvlan->phy_dev;
 203         struct ipvl_addr *addr;
 204
 205         dev_uc_unsync(phy_dev, dev);
 206         dev_mc_unsync(phy_dev, dev);
 207
 208         rcu_read_lock();
 209         list_for_each_entry_rcu(addr, &ipvlan->addrs, anode)
 210                 ipvlan_ht_addr_del(addr);
 211         rcu_read_unlock();
 212
 213         return 0;
 214 }
 215
 216 static netdev_tx_t ipvlan_start_xmit(struct sk_buff *skb,
 217                                      struct net_device *dev)
 218 {
 219         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 220         int skblen = skb->len;
 221         int ret;
 222
 223         ret = ipvlan_queue_xmit(skb, dev);
 224         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 225                 struct ipvl_pcpu_stats *pcptr;
 226
 227                 pcptr = this_cpu_ptr(ipvlan->pcpu_stats);
 228
 229                 u64_stats_update_begin(&pcptr->syncp);
 230                 u64_stats_inc(&pcptr->tx_pkts);
 231                 u64_stats_add(&pcptr->tx_bytes, skblen);
 232                 u64_stats_update_end(&pcptr->syncp);
 233         } else {
 234                 this_cpu_inc(ipvlan->pcpu_stats->tx_drps);
 235         }
 236         return ret;
 237 }
 238
 239 static netdev_features_t ipvlan_fix_features(struct net_device *dev,
 240                                              netdev_features_t features)
 241 {
 242         struct ipvl_dev *ipvlan = netdev_priv(dev);
 243
 244         features |= NETIF_F_ALL_FOR_ALL;
 245         features &= (ipvlan->sfeatures | ~IPVLAN_FEATURES);
 246         features = netdev_increment_features(ipvlan->phy_dev->features,
 247                                              features, features);
 248         features |= IPVLAN_ALWAYS_ON;
 249         features &= (IPVLAN_FEATURES | IPVLAN_ALWAYS_ON);
 250
 251         return features;
 252 }
 253
 254 static void ipvlan_change_rx_flags(struct net_device *dev, int change)
 255 {
 256         struct ipvl_dev *ipvlan = netdev_priv(dev);
 257         struct net_device *phy_dev = ipvlan->phy_dev;
 258
 259         if (change & IFF_ALLMULTI)
 260                 dev_set_allmulti(phy_dev, dev->flags & IFF_ALLMULTI? 1 : -1);
 261 }
 262
 263 static void ipvlan_set_multicast_mac_filter(struct net_device *dev)
 264 {
 265         struct ipvl_dev *ipvlan = netdev_priv(dev);
 266
 267         if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
 268                 bitmap_fill(ipvlan->mac_filters, IPVLAN_MAC_FILTER_SIZE);
 269         } else {
 270                 struct netdev_hw_addr *ha;
 271                 DECLARE_BITMAP(mc_filters, IPVLAN_MAC_FILTER_SIZE);
 272
 273                 bitmap_zero(mc_filters, IPVLAN_MAC_FILTER_SIZE);
 274                 netdev_for_each_mc_addr(ha, dev)
 275                         __set_bit(ipvlan_mac_hash(ha->addr), mc_filters);
 276
 277                 /* Turn-on broadcast bit irrespective of address family,
 278                  * since broadcast is deferred to a work-queue, hence no
 279                  * impact on fast-path processing.
 280                  */
 281                 __set_bit(ipvlan_mac_hash(dev->broadcast), mc_filters);
 282
 283                 bitmap_copy(ipvlan->mac_filters, mc_filters,
 284                             IPVLAN_MAC_FILTER_SIZE);
 285         }
 286         dev_uc_sync(ipvlan->phy_dev, dev);
 287         dev_mc_sync(ipvlan->phy_dev, dev);
 288 }
 289
 290 static void ipvlan_get_stats64(struct net_device *dev,
 291                                struct rtnl_link_stats64 *s)
 292 {
 293         struct ipvl_dev *ipvlan = netdev_priv(dev);
 294
 295         if (ipvlan->pcpu_stats) {
 296                 struct ipvl_pcpu_stats *pcptr;
 297                 u64 rx_pkts, rx_bytes, rx_mcast, tx_pkts, tx_bytes;
 298                 u32 rx_errs = 0, tx_drps = 0;
 299                 u32 strt;
 300                 int idx;
 301
 302                 for_each_possible_cpu(idx) {
 303                         pcptr = per_cpu_ptr(ipvlan->pcpu_stats, idx);
 304                         do {
 305                                 strt = u64_stats_fetch_begin(&pcptr->syncp);
 306                                 rx_pkts = u64_stats_read(&pcptr->rx_pkts);
 307                                 rx_bytes = u64_stats_read(&pcptr->rx_bytes);
 308                                 rx_mcast = u64_stats_read(&pcptr->rx_mcast);
 309                                 tx_pkts = u64_stats_read(&pcptr->tx_pkts);
 310                                 tx_bytes = u64_stats_read(&pcptr->tx_bytes);
 311                         } while (u64_stats_fetch_retry(&pcptr->syncp,
 312                                                            strt));
 313
 314                         s->rx_packets += rx_pkts;
 315                         s->rx_bytes += rx_bytes;
 316                         s->multicast += rx_mcast;
 317                         s->tx_packets += tx_pkts;
 318                         s->tx_bytes += tx_bytes;
 319
 320                         /* u32 values are updated without syncp protection. */
 321                         rx_errs += READ_ONCE(pcptr->rx_errs);
 322                         tx_drps += READ_ONCE(pcptr->tx_drps);
 323                 }
 324                 s->rx_errors = rx_errs;
 325                 s->rx_dropped = rx_errs;
 326                 s->tx_dropped = tx_drps;
 327         }
 328         s->tx_errors = DEV_STATS_READ(dev, tx_errors);
 329 }
 330
 331 static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid)
 332 {
 333         struct ipvl_dev *ipvlan = netdev_priv(dev);
 334         struct net_device *phy_dev = ipvlan->phy_dev;
 335
 336         return vlan_vid_add(phy_dev, proto, vid);
 337 }
 338
 339 static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
 340                                    u16 vid)
 341 {
 342         struct ipvl_dev *ipvlan = netdev_priv(dev);
 343         struct net_device *phy_dev = ipvlan->phy_dev;
 344
 345         vlan_vid_del(phy_dev, proto, vid);
 346         return 0;
 347 }
 348
 349 static int ipvlan_get_iflink(const struct net_device *dev)
 350 {
 351         struct ipvl_dev *ipvlan = netdev_priv(dev);
 352
 353         return READ_ONCE(ipvlan->phy_dev->ifindex);
 354 }
 355
 356 static const struct net_device_ops ipvlan_netdev_ops = {
 357         .ndo_init               = ipvlan_init,
 358         .ndo_uninit             = ipvlan_uninit,
 359         .ndo_open               = ipvlan_open,
 360         .ndo_stop               = ipvlan_stop,
 361         .ndo_start_xmit         = ipvlan_start_xmit,
 362         .ndo_fix_features       = ipvlan_fix_features,
 363         .ndo_change_rx_flags    = ipvlan_change_rx_flags,
 364         .ndo_set_rx_mode        = ipvlan_set_multicast_mac_filter,
 365         .ndo_get_stats64        = ipvlan_get_stats64,
 366         .ndo_vlan_rx_add_vid    = ipvlan_vlan_rx_add_vid,
 367         .ndo_vlan_rx_kill_vid   = ipvlan_vlan_rx_kill_vid,
 368         .ndo_get_iflink         = ipvlan_get_iflink,
 369 };
 370
 371 static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
 372                               unsigned short type, const void *daddr,
 373                               const void *saddr, unsigned len)
 374 {
 375         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 376         struct net_device *phy_dev = ipvlan->phy_dev;
 377
 378         /* TODO Probably use a different field than dev_addr so that the
 379          * mac-address on the virtual device is portable and can be carried
 380          * while the packets use the mac-addr on the physical device.
 381          */
 382         return dev_hard_header(skb, phy_dev, type, daddr,
 383                                saddr ? : phy_dev->dev_addr, len);
 384 }
 385
 386 static const struct header_ops ipvlan_header_ops = {
 387         .create         = ipvlan_hard_header,
 388         .parse          = eth_header_parse,
 389         .cache          = eth_header_cache,
 390         .cache_update   = eth_header_cache_update,
 391         .parse_protocol = eth_header_parse_protocol,
 392 };
 393
 394 static void ipvlan_adjust_mtu(struct ipvl_dev *ipvlan, struct net_device *dev)
 395 {
 396         ipvlan->dev->mtu = dev->mtu;
 397 }
 398
 399 static bool netif_is_ipvlan(const struct net_device *dev)
 400 {
 401         /* both ipvlan and ipvtap devices use the same netdev_ops */
 402         return dev->netdev_ops == &ipvlan_netdev_ops;
 403 }
 404
 405 static int ipvlan_ethtool_get_link_ksettings(struct net_device *dev,
 406                                              struct ethtool_link_ksettings *cmd)
 407 {
 408         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 409
 410         return __ethtool_get_link_ksettings(ipvlan->phy_dev, cmd);
 411 }
 412
 413 static void ipvlan_ethtool_get_drvinfo(struct net_device *dev,
 414                                        struct ethtool_drvinfo *drvinfo)
 415 {
 416         strscpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver));
 417         strscpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version));
 418 }
 419
 420 static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev)
 421 {
 422         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 423
 424         return ipvlan->msg_enable;
 425 }
 426
 427 static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value)
 428 {
 429         struct ipvl_dev *ipvlan = netdev_priv(dev);
 430
 431         ipvlan->msg_enable = value;
 432 }
 433
 434 static const struct ethtool_ops ipvlan_ethtool_ops = {
 435         .get_link       = ethtool_op_get_link,
 436         .get_link_ksettings     = ipvlan_ethtool_get_link_ksettings,
 437         .get_drvinfo    = ipvlan_ethtool_get_drvinfo,
 438         .get_msglevel   = ipvlan_ethtool_get_msglevel,
 439         .set_msglevel   = ipvlan_ethtool_set_msglevel,
 440 };
 441
 442 static int ipvlan_nl_changelink(struct net_device *dev,
 443                                 struct nlattr *tb[], struct nlattr *data[],
 444                                 struct netlink_ext_ack *extack)
 445 {
 446         struct ipvl_dev *ipvlan = netdev_priv(dev);
 447         struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
 448         int err = 0;
 449
 450         if (!data)
 451                 return 0;
 452         if (!ns_capable(dev_net(ipvlan->phy_dev)->user_ns, CAP_NET_ADMIN))
 453                 return -EPERM;
 454
 455         if (data[IFLA_IPVLAN_MODE]) {
 456                 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
 457
 458                 err = ipvlan_set_port_mode(port, nmode, extack);
 459         }
 460
 461         if (!err && data[IFLA_IPVLAN_FLAGS]) {
 462                 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
 463
 464                 if (flags & IPVLAN_F_PRIVATE)
 465                         ipvlan_mark_private(port);
 466                 else
 467                         ipvlan_clear_private(port);
 468
 469                 if (flags & IPVLAN_F_VEPA)
 470                         ipvlan_mark_vepa(port);
 471                 else
 472                         ipvlan_clear_vepa(port);
 473         }
 474
 475         return err;
 476 }
 477
 478 static size_t ipvlan_nl_getsize(const struct net_device *dev)
 479 {
 480         return (0
 481                 + nla_total_size(2) /* IFLA_IPVLAN_MODE */
 482                 + nla_total_size(2) /* IFLA_IPVLAN_FLAGS */
 483                 );
 484 }
 485
 486 static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[],
 487                               struct netlink_ext_ack *extack)
 488 {
 489         if (!data)
 490                 return 0;
 491
 492         if (data[IFLA_IPVLAN_MODE]) {
 493                 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
 494
 495                 if (mode >= IPVLAN_MODE_MAX)
 496                         return -EINVAL;
 497         }
 498         if (data[IFLA_IPVLAN_FLAGS]) {
 499                 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
 500
 501                 /* Only two bits are used at this moment. */
 502                 if (flags & ~(IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
 503                         return -EINVAL;
 504                 /* Also both flags can't be active at the same time. */
 505                 if ((flags & (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) ==
 506                     (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
 507                         return -EINVAL;
 508         }
 509
 510         return 0;
 511 }
 512
 513 static int ipvlan_nl_fillinfo(struct sk_buff *skb,
 514                               const struct net_device *dev)
 515 {
 516         struct ipvl_dev *ipvlan = netdev_priv(dev);
 517         struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
 518         int ret = -EINVAL;
 519
 520         if (!port)
 521                 goto err;
 522
 523         ret = -EMSGSIZE;
 524         if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode))
 525                 goto err;
 526         if (nla_put_u16(skb, IFLA_IPVLAN_FLAGS, port->flags))
 527                 goto err;
 528
 529         return 0;
 530
 531 err:
 532         return ret;
 533 }
 534
 535 int ipvlan_link_new(struct net *src_net, struct net_device *dev,
 536                     struct nlattr *tb[], struct nlattr *data[],
 537                     struct netlink_ext_ack *extack)
 538 {
 539         struct ipvl_dev *ipvlan = netdev_priv(dev);
 540         struct ipvl_port *port;
 541         struct net_device *phy_dev;
 542         int err;
 543         u16 mode = IPVLAN_MODE_L3;
 544
 545         if (!tb[IFLA_LINK])
 546                 return -EINVAL;
 547
 548         phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
 549         if (!phy_dev)
 550                 return -ENODEV;
 551
 552         if (netif_is_ipvlan(phy_dev)) {
 553                 struct ipvl_dev *tmp = netdev_priv(phy_dev);
 554
 555                 phy_dev = tmp->phy_dev;
 556                 if (!ns_capable(dev_net(phy_dev)->user_ns, CAP_NET_ADMIN))
 557                         return -EPERM;
 558         } else if (!netif_is_ipvlan_port(phy_dev)) {
 559                 /* Exit early if the underlying link is invalid or busy */
 560                 if (phy_dev->type != ARPHRD_ETHER ||
 561                     phy_dev->flags & IFF_LOOPBACK) {
 562                         netdev_err(phy_dev,
 563                                    "Master is either lo or non-ether device\n");
 564                         return -EINVAL;
 565                 }
 566
 567                 if (netdev_is_rx_handler_busy(phy_dev)) {
 568                         netdev_err(phy_dev, "Device is already in use.\n");
 569                         return -EBUSY;
 570                 }
 571         }
 572
 573         ipvlan->phy_dev = phy_dev;
 574         ipvlan->dev = dev;
 575         ipvlan->sfeatures = IPVLAN_FEATURES;
 576         if (!tb[IFLA_MTU])
 577                 ipvlan_adjust_mtu(ipvlan, phy_dev);
 578         INIT_LIST_HEAD(&ipvlan->addrs);
 579         spin_lock_init(&ipvlan->addrs_lock);
 580
 581         /* TODO Probably put random address here to be presented to the
 582          * world but keep using the physical-dev address for the outgoing
 583          * packets.
 584          */
 585         eth_hw_addr_set(dev, phy_dev->dev_addr);
 586
 587         dev->priv_flags |= IFF_NO_RX_HANDLER;
 588
 589         err = register_netdevice(dev);
 590         if (err < 0)
 591                 return err;
 592
 593         /* ipvlan_init() would have created the port, if required */
 594         port = ipvlan_port_get_rtnl(phy_dev);
 595         ipvlan->port = port;
 596
 597         /* If the port-id base is at the MAX value, then wrap it around and
 598          * begin from 0x1 again. This may be due to a busy system where lots
 599          * of slaves are getting created and deleted.
 600          */
 601         if (port->dev_id_start == 0xFFFE)
 602                 port->dev_id_start = 0x1;
 603
 604         /* Since L2 address is shared among all IPvlan slaves including
 605          * master, use unique 16 bit dev-ids to differentiate among them.
 606          * Assign IDs between 0x1 and 0xFFFE (used by the master) to each
 607          * slave link [see addrconf_ifid_eui48()].
 608          */
 609         err = ida_alloc_range(&port->ida, port->dev_id_start, 0xFFFD,
 610                               GFP_KERNEL);
 611         if (err < 0)
 612                 err = ida_alloc_range(&port->ida, 0x1, port->dev_id_start - 1,
 613                                       GFP_KERNEL);
 614         if (err < 0)
 615                 goto unregister_netdev;
 616         dev->dev_id = err;
 617
 618         /* Increment id-base to the next slot for the future assignment */
 619         port->dev_id_start = err + 1;
 620
 621         err = netdev_upper_dev_link(phy_dev, dev, extack);
 622         if (err)
 623                 goto remove_ida;
 624
 625         /* Flags are per port and latest update overrides. User has
 626          * to be consistent in setting it just like the mode attribute.
 627          */
 628         if (data && data[IFLA_IPVLAN_FLAGS])
 629                 port->flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
 630
 631         if (data && data[IFLA_IPVLAN_MODE])
 632                 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
 633
 634         err = ipvlan_set_port_mode(port, mode, extack);
 635         if (err)
 636                 goto unlink_netdev;
 637
 638         list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans);
 639         netif_stacked_transfer_operstate(phy_dev, dev);
 640         return 0;
 641
 642 unlink_netdev:
 643         netdev_upper_dev_unlink(phy_dev, dev);
 644 remove_ida:
 645         ida_free(&port->ida, dev->dev_id);
 646 unregister_netdev:
 647         unregister_netdevice(dev);
 648         return err;
 649 }
 650 EXPORT_SYMBOL_GPL(ipvlan_link_new);
 651
 652 void ipvlan_link_delete(struct net_device *dev, struct list_head *head)
 653 {
 654         struct ipvl_dev *ipvlan = netdev_priv(dev);
 655         struct ipvl_addr *addr, *next;
 656
 657         spin_lock_bh(&ipvlan->addrs_lock);
 658         list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) {
 659                 ipvlan_ht_addr_del(addr);
 660                 list_del_rcu(&addr->anode);
 661                 kfree_rcu(addr, rcu);
 662         }
 663         spin_unlock_bh(&ipvlan->addrs_lock);
 664
 665         ida_free(&ipvlan->port->ida, dev->dev_id);
 666         list_del_rcu(&ipvlan->pnode);
 667         unregister_netdevice_queue(dev, head);
 668         netdev_upper_dev_unlink(ipvlan->phy_dev, dev);
 669 }
 670 EXPORT_SYMBOL_GPL(ipvlan_link_delete);
 671
 672 void ipvlan_link_setup(struct net_device *dev)
 673 {
 674         ether_setup(dev);
 675
 676         dev->max_mtu = ETH_MAX_MTU;
 677         dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
 678         dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE;
 679         dev->netdev_ops = &ipvlan_netdev_ops;
 680         dev->needs_free_netdev = true;
 681         dev->header_ops = &ipvlan_header_ops;
 682         dev->ethtool_ops = &ipvlan_ethtool_ops;
 683 }
 684 EXPORT_SYMBOL_GPL(ipvlan_link_setup);
 685
 686 static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] =
 687 {
 688         [IFLA_IPVLAN_MODE] = { .type = NLA_U16 },
 689         [IFLA_IPVLAN_FLAGS] = { .type = NLA_U16 },
 690 };
 691
 692 static struct net *ipvlan_get_link_net(const struct net_device *dev)
 693 {
 694         struct ipvl_dev *ipvlan = netdev_priv(dev);
 695
 696         return dev_net(ipvlan->phy_dev);
 697 }
 698
 699 static struct rtnl_link_ops ipvlan_link_ops = {
 700         .kind           = "ipvlan",
 701         .priv_size      = sizeof(struct ipvl_dev),
 702
 703         .setup          = ipvlan_link_setup,
 704         .newlink        = ipvlan_link_new,
 705         .dellink        = ipvlan_link_delete,
 706         .get_link_net   = ipvlan_get_link_net,
 707 };
 708
 709 int ipvlan_link_register(struct rtnl_link_ops *ops)
 710 {
 711         ops->get_size   = ipvlan_nl_getsize;
 712         ops->policy     = ipvlan_nl_policy;
 713         ops->validate   = ipvlan_nl_validate;
 714         ops->fill_info  = ipvlan_nl_fillinfo;
 715         ops->changelink = ipvlan_nl_changelink;
 716         ops->maxtype    = IFLA_IPVLAN_MAX;
 717         return rtnl_link_register(ops);
 718 }
 719 EXPORT_SYMBOL_GPL(ipvlan_link_register);
 720
 721 static int ipvlan_device_event(struct notifier_block *unused,
 722                                unsigned long event, void *ptr)
 723 {
 724         struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr);
 725         struct netdev_notifier_pre_changeaddr_info *prechaddr_info;
 726         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 727         struct ipvl_dev *ipvlan, *next;
 728         struct ipvl_port *port;
 729         LIST_HEAD(lst_kill);
 730         int err;
 731
 732         if (!netif_is_ipvlan_port(dev))
 733                 return NOTIFY_DONE;
 734
 735         port = ipvlan_port_get_rtnl(dev);
 736
 737         switch (event) {
 738         case NETDEV_UP:
 739         case NETDEV_DOWN:
 740         case NETDEV_CHANGE:
 741                 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
 742                         netif_stacked_transfer_operstate(ipvlan->phy_dev,
 743                                                          ipvlan->dev);
 744                 break;
 745
 746         case NETDEV_REGISTER: {
 747                 struct net *oldnet, *newnet = dev_net(dev);
 748
 749                 oldnet = read_pnet(&port->pnet);
 750                 if (net_eq(newnet, oldnet))
 751                         break;
 752
 753                 write_pnet(&port->pnet, newnet);
 754
 755                 if (port->mode == IPVLAN_MODE_L3S)
 756                         ipvlan_migrate_l3s_hook(oldnet, newnet);
 757                 break;
 758         }
 759         case NETDEV_UNREGISTER:
 760                 if (dev->reg_state != NETREG_UNREGISTERING)
 761                         break;
 762
 763                 list_for_each_entry_safe(ipvlan, next, &port->ipvlans, pnode)
 764                         ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev,
 765                                                             &lst_kill);
 766                 unregister_netdevice_many(&lst_kill);
 767                 break;
 768
 769         case NETDEV_FEAT_CHANGE:
 770                 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
 771                         netif_inherit_tso_max(ipvlan->dev, dev);
 772                         netdev_update_features(ipvlan->dev);
 773                 }
 774                 break;
 775
 776         case NETDEV_CHANGEMTU:
 777                 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
 778                         ipvlan_adjust_mtu(ipvlan, dev);
 779                 break;
 780
 781         case NETDEV_PRE_CHANGEADDR:
 782                 prechaddr_info = ptr;
 783                 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
 784                         err = dev_pre_changeaddr_notify(ipvlan->dev,
 785                                                     prechaddr_info->dev_addr,
 786                                                     extack);
 787                         if (err)
 788                                 return notifier_from_errno(err);
 789                 }
 790                 break;
 791
 792         case NETDEV_CHANGEADDR:
 793                 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
 794                         eth_hw_addr_set(ipvlan->dev, dev->dev_addr);
 795                         call_netdevice_notifiers(NETDEV_CHANGEADDR, ipvlan->dev);
 796                 }
 797                 break;
 798
 799         case NETDEV_PRE_TYPE_CHANGE:
 800                 /* Forbid underlying device to change its type. */
 801                 return NOTIFY_BAD;
 802
 803         case NETDEV_NOTIFY_PEERS:
 804         case NETDEV_BONDING_FAILOVER:
 805         case NETDEV_RESEND_IGMP:
 806                 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
 807                         call_netdevice_notifiers(event, ipvlan->dev);
 808         }
 809         return NOTIFY_DONE;
 810 }
 811
 812 /* the caller must held the addrs lock */
 813 static int ipvlan_add_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
 814 {
 815         struct ipvl_addr *addr;
 816
 817         addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC);
 818         if (!addr)
 819                 return -ENOMEM;
 820
 821         addr->master = ipvlan;
 822         if (!is_v6) {
 823                 memcpy(&addr->ip4addr, iaddr, sizeof(struct in_addr));
 824                 addr->atype = IPVL_IPV4;
 825 #if IS_ENABLED(CONFIG_IPV6)
 826         } else {
 827                 memcpy(&addr->ip6addr, iaddr, sizeof(struct in6_addr));
 828                 addr->atype = IPVL_IPV6;
 829 #endif
 830         }
 831
 832         list_add_tail_rcu(&addr->anode, &ipvlan->addrs);
 833
 834         /* If the interface is not up, the address will be added to the hash
 835          * list by ipvlan_open.
 836          */
 837         if (netif_running(ipvlan->dev))
 838                 ipvlan_ht_addr_add(ipvlan, addr);
 839
 840         return 0;
 841 }
 842
 843 static void ipvlan_del_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
 844 {
 845         struct ipvl_addr *addr;
 846
 847         spin_lock_bh(&ipvlan->addrs_lock);
 848         addr = ipvlan_find_addr(ipvlan, iaddr, is_v6);
 849         if (!addr) {
 850                 spin_unlock_bh(&ipvlan->addrs_lock);
 851                 return;
 852         }
 853
 854         ipvlan_ht_addr_del(addr);
 855         list_del_rcu(&addr->anode);
 856         spin_unlock_bh(&ipvlan->addrs_lock);
 857         kfree_rcu(addr, rcu);
 858 }
 859
 860 static bool ipvlan_is_valid_dev(const struct net_device *dev)
 861 {
 862         struct ipvl_dev *ipvlan = netdev_priv(dev);
 863
 864         if (!netif_is_ipvlan(dev))
 865                 return false;
 866
 867         if (!ipvlan || !ipvlan->port)
 868                 return false;
 869
 870         return true;
 871 }
 872
 873 #if IS_ENABLED(CONFIG_IPV6)
 874 static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
 875 {
 876         int ret = -EINVAL;
 877
 878         spin_lock_bh(&ipvlan->addrs_lock);
 879         if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true))
 880                 netif_err(ipvlan, ifup, ipvlan->dev,
 881                           "Failed to add IPv6=%pI6c addr for %s intf\n",
 882                           ip6_addr, ipvlan->dev->name);
 883         else
 884                 ret = ipvlan_add_addr(ipvlan, ip6_addr, true);
 885         spin_unlock_bh(&ipvlan->addrs_lock);
 886         return ret;
 887 }
 888
 889 static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
 890 {
 891         return ipvlan_del_addr(ipvlan, ip6_addr, true);
 892 }
 893
 894 static int ipvlan_addr6_event(struct notifier_block *unused,
 895                               unsigned long event, void *ptr)
 896 {
 897         struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr;
 898         struct net_device *dev = (struct net_device *)if6->idev->dev;
 899         struct ipvl_dev *ipvlan = netdev_priv(dev);
 900
 901         if (!ipvlan_is_valid_dev(dev))
 902                 return NOTIFY_DONE;
 903
 904         switch (event) {
 905         case NETDEV_UP:
 906                 if (ipvlan_add_addr6(ipvlan, &if6->addr))
 907                         return NOTIFY_BAD;
 908                 break;
 909
 910         case NETDEV_DOWN:
 911                 ipvlan_del_addr6(ipvlan, &if6->addr);
 912                 break;
 913         }
 914
 915         return NOTIFY_OK;
 916 }
 917
 918 static int ipvlan_addr6_validator_event(struct notifier_block *unused,
 919                                         unsigned long event, void *ptr)
 920 {
 921         struct in6_validator_info *i6vi = (struct in6_validator_info *)ptr;
 922         struct net_device *dev = (struct net_device *)i6vi->i6vi_dev->dev;
 923         struct ipvl_dev *ipvlan = netdev_priv(dev);
 924
 925         if (!ipvlan_is_valid_dev(dev))
 926                 return NOTIFY_DONE;
 927
 928         switch (event) {
 929         case NETDEV_UP:
 930                 if (ipvlan_addr_busy(ipvlan->port, &i6vi->i6vi_addr, true)) {
 931                         NL_SET_ERR_MSG(i6vi->extack,
 932                                        "Address already assigned to an ipvlan device");
 933                         return notifier_from_errno(-EADDRINUSE);
 934                 }
 935                 break;
 936         }
 937
 938         return NOTIFY_OK;
 939 }
 940 #endif
 941
 942 static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
 943 {
 944         int ret = -EINVAL;
 945
 946         spin_lock_bh(&ipvlan->addrs_lock);
 947         if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false))
 948                 netif_err(ipvlan, ifup, ipvlan->dev,
 949                           "Failed to add IPv4=%pI4 on %s intf.\n",
 950                           ip4_addr, ipvlan->dev->name);
 951         else
 952                 ret = ipvlan_add_addr(ipvlan, ip4_addr, false);
 953         spin_unlock_bh(&ipvlan->addrs_lock);
 954         return ret;
 955 }
 956
 957 static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
 958 {
 959         return ipvlan_del_addr(ipvlan, ip4_addr, false);
 960 }
 961
 962 static int ipvlan_addr4_event(struct notifier_block *unused,
 963                               unsigned long event, void *ptr)
 964 {
 965         struct in_ifaddr *if4 = (struct in_ifaddr *)ptr;
 966         struct net_device *dev = (struct net_device *)if4->ifa_dev->dev;
 967         struct ipvl_dev *ipvlan = netdev_priv(dev);
 968         struct in_addr ip4_addr;
 969
 970         if (!ipvlan_is_valid_dev(dev))
 971                 return NOTIFY_DONE;
 972
 973         switch (event) {
 974         case NETDEV_UP:
 975                 ip4_addr.s_addr = if4->ifa_address;
 976                 if (ipvlan_add_addr4(ipvlan, &ip4_addr))
 977                         return NOTIFY_BAD;
 978                 break;
 979
 980         case NETDEV_DOWN:
 981                 ip4_addr.s_addr = if4->ifa_address;
 982                 ipvlan_del_addr4(ipvlan, &ip4_addr);
 983                 break;
 984         }
 985
 986         return NOTIFY_OK;
 987 }
 988
 989 static int ipvlan_addr4_validator_event(struct notifier_block *unused,
 990                                         unsigned long event, void *ptr)
 991 {
 992         struct in_validator_info *ivi = (struct in_validator_info *)ptr;
 993         struct net_device *dev = (struct net_device *)ivi->ivi_dev->dev;
 994         struct ipvl_dev *ipvlan = netdev_priv(dev);
 995
 996         if (!ipvlan_is_valid_dev(dev))
 997                 return NOTIFY_DONE;
 998
 999         switch (event) {
1000         case NETDEV_UP:
1001                 if (ipvlan_addr_busy(ipvlan->port, &ivi->ivi_addr, false)) {
1002                         NL_SET_ERR_MSG(ivi->extack,
1003                                        "Address already assigned to an ipvlan device");
1004                         return notifier_from_errno(-EADDRINUSE);
1005                 }
1006                 break;
1007         }
1008
1009         return NOTIFY_OK;
1010 }
1011
1012 static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = {
1013         .notifier_call = ipvlan_addr4_event,
1014 };
1015
1016 static struct notifier_block ipvlan_addr4_vtor_notifier_block __read_mostly = {
1017         .notifier_call = ipvlan_addr4_validator_event,
1018 };
1019
1020 static struct notifier_block ipvlan_notifier_block __read_mostly = {
1021         .notifier_call = ipvlan_device_event,
1022 };
1023
1024 #if IS_ENABLED(CONFIG_IPV6)
1025 static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = {
1026         .notifier_call = ipvlan_addr6_event,
1027 };
1028
1029 static struct notifier_block ipvlan_addr6_vtor_notifier_block __read_mostly = {
1030         .notifier_call = ipvlan_addr6_validator_event,
1031 };
1032 #endif
1033
1034 static int __init ipvlan_init_module(void)
1035 {
1036         int err;
1037
1038         ipvlan_init_secret();
1039         register_netdevice_notifier(&ipvlan_notifier_block);
1040 #if IS_ENABLED(CONFIG_IPV6)
1041         register_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1042         register_inet6addr_validator_notifier(
1043             &ipvlan_addr6_vtor_notifier_block);
1044 #endif
1045         register_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1046         register_inetaddr_validator_notifier(&ipvlan_addr4_vtor_notifier_block);
1047
1048         err = ipvlan_l3s_init();
1049         if (err < 0)
1050                 goto error;
1051
1052         err = ipvlan_link_register(&ipvlan_link_ops);
1053         if (err < 0) {
1054                 ipvlan_l3s_cleanup();
1055                 goto error;
1056         }
1057
1058         return 0;
1059 error:
1060         unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1061         unregister_inetaddr_validator_notifier(
1062             &ipvlan_addr4_vtor_notifier_block);
1063 #if IS_ENABLED(CONFIG_IPV6)
1064         unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1065         unregister_inet6addr_validator_notifier(
1066             &ipvlan_addr6_vtor_notifier_block);
1067 #endif
1068         unregister_netdevice_notifier(&ipvlan_notifier_block);
1069         return err;
1070 }
1071
1072 static void __exit ipvlan_cleanup_module(void)
1073 {
1074         rtnl_link_unregister(&ipvlan_link_ops);
1075         ipvlan_l3s_cleanup();
1076         unregister_netdevice_notifier(&ipvlan_notifier_block);
1077         unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1078         unregister_inetaddr_validator_notifier(
1079             &ipvlan_addr4_vtor_notifier_block);
1080 #if IS_ENABLED(CONFIG_IPV6)
1081         unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1082         unregister_inet6addr_validator_notifier(
1083             &ipvlan_addr6_vtor_notifier_block);
1084 #endif
1085 }
1086
1087 module_init(ipvlan_init_module);
1088 module_exit(ipvlan_cleanup_module);
1089
1090 MODULE_LICENSE("GPL");
1091 MODULE_AUTHOR("Mahesh Bandewar <[email protected]>");
1092 MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs");
1093 MODULE_ALIAS_RTNL_LINK("ipvlan");