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   1 /*
   2  * INET         802.1Q VLAN
   3  *              Ethernet-type device handling.
   4  *
   5  * Authors:     Ben Greear <greearb@candelatech.com>
   6  *              Please send support related email to: netdev@vger.kernel.org
   7  *              VLAN Home Page: http://www.candelatech.com/~greear/vlan.html
   8  *
   9  * Fixes:
  10  *              Fix for packet capture - Nick Eggleston <nick@dccinc.com>;
  11  *              Add HW acceleration hooks - David S. Miller <davem@redhat.com>;
  12  *              Correct all the locking - David S. Miller <davem@redhat.com>;
  13  *              Use hash table for VLAN groups - David S. Miller <davem@redhat.com>
  14  *
  15  *              This program is free software; you can redistribute it and/or
  16  *              modify it under the terms of the GNU General Public License
  17  *              as published by the Free Software Foundation; either version
  18  *              2 of the License, or (at your option) any later version.
  19  */
  20
  21 #include <linux/capability.h>
  22 #include <linux/module.h>
  23 #include <linux/netdevice.h>
  24 #include <linux/skbuff.h>
  25 #include <linux/init.h>
  26 #include <linux/rculist.h>
  27 #include <net/p8022.h>
  28 #include <net/arp.h>
  29 #include <linux/rtnetlink.h>
  30 #include <linux/notifier.h>
  31 #include <net/rtnetlink.h>
  32 #include <net/net_namespace.h>
  33 #include <net/netns/generic.h>
  34 #include <asm/uaccess.h>
  35
  36 #include <linux/if_vlan.h>
  37 #include "vlan.h"
  38 #include "vlanproc.h"
  39
  40 #define DRV_VERSION "1.8"
  41
  42 /* Global VLAN variables */
  43
  44 int vlan_net_id __read_mostly;
  45
  46 /* Our listing of VLAN group(s) */
  47 static struct hlist_head vlan_group_hash[VLAN_GRP_HASH_SIZE];
  48
  49 const char vlan_fullname[] = "802.1Q VLAN Support";
  50 const char vlan_version[] = DRV_VERSION;
  51 static const char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>";
  52 static const char vlan_buggyright[] = "David S. Miller <davem@redhat.com>";
  53
  54 static struct packet_type vlan_packet_type __read_mostly = {
  55         .type = cpu_to_be16(ETH_P_8021Q),
  56         .func = vlan_skb_recv, /* VLAN receive method */
  57 };
  58
  59 /* End of global variables definitions. */
  60
  61 static inline unsigned int vlan_grp_hashfn(unsigned int idx)
  62 {
  63         return ((idx >> VLAN_GRP_HASH_SHIFT) ^ idx) & VLAN_GRP_HASH_MASK;
  64 }
  65
  66 /* Must be invoked with RCU read lock (no preempt) */
  67 static struct vlan_group *__vlan_find_group(struct net_device *real_dev)
  68 {
  69         struct vlan_group *grp;
  70         struct hlist_node *n;
  71         int hash = vlan_grp_hashfn(real_dev->ifindex);
  72
  73         hlist_for_each_entry_rcu(grp, n, &vlan_group_hash[hash], hlist) {
  74                 if (grp->real_dev == real_dev)
  75                         return grp;
  76         }
  77
  78         return NULL;
  79 }
  80
  81 /*  Find the protocol handler.  Assumes VID < VLAN_VID_MASK.
  82  *
  83  * Must be invoked with RCU read lock (no preempt)
  84  */
  85 struct net_device *__find_vlan_dev(struct net_device *real_dev, u16 vlan_id)
  86 {
  87         struct vlan_group *grp = __vlan_find_group(real_dev);
  88
  89         if (grp)
  90                 return vlan_group_get_device(grp, vlan_id);
  91
  92         return NULL;
  93 }
  94
  95 static void vlan_group_free(struct vlan_group *grp)
  96 {
  97         int i;
  98
  99         for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
 100                 kfree(grp->vlan_devices_arrays[i]);
 101         kfree(grp);
 102 }
 103
 104 static struct vlan_group *vlan_group_alloc(struct net_device *real_dev)
 105 {
 106         struct vlan_group *grp;
 107
 108         grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
 109         if (!grp)
 110                 return NULL;
 111
 112         grp->real_dev = real_dev;
 113         hlist_add_head_rcu(&grp->hlist,
 114                         &vlan_group_hash[vlan_grp_hashfn(real_dev->ifindex)]);
 115         return grp;
 116 }
 117
 118 static int vlan_group_prealloc_vid(struct vlan_group *vg, u16 vlan_id)
 119 {
 120         struct net_device **array;
 121         unsigned int size;
 122
 123         ASSERT_RTNL();
 124
 125         array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
 126         if (array != NULL)
 127                 return 0;
 128
 129         size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
 130         array = kzalloc(size, GFP_KERNEL);
 131         if (array == NULL)
 132                 return -ENOBUFS;
 133
 134         vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN] = array;
 135         return 0;
 136 }
 137
 138 static void vlan_rcu_free(struct rcu_head *rcu)
 139 {
 140         vlan_group_free(container_of(rcu, struct vlan_group, rcu));
 141 }
 142
 143 void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
 144 {
 145         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 146         struct net_device *real_dev = vlan->real_dev;
 147         const struct net_device_ops *ops = real_dev->netdev_ops;
 148         struct vlan_group *grp;
 149         u16 vlan_id = vlan->vlan_id;
 150
 151         ASSERT_RTNL();
 152
 153         grp = __vlan_find_group(real_dev);
 154         BUG_ON(!grp);
 155
 156         /* Take it out of our own structures, but be sure to interlock with
 157          * HW accelerating devices or SW vlan input packet processing.
 158          */
 159         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 160                 ops->ndo_vlan_rx_kill_vid(real_dev, vlan_id);
 161
 162         grp->nr_vlans--;
 163
 164         vlan_group_set_device(grp, vlan_id, NULL);
 165         if (!grp->killall)
 166                 synchronize_net();
 167
 168         unregister_netdevice_queue(dev, head);
 169
 170         /* If the group is now empty, kill off the group. */
 171         if (grp->nr_vlans == 0) {
 172                 vlan_gvrp_uninit_applicant(real_dev);
 173
 174                 if (real_dev->features & NETIF_F_HW_VLAN_RX)
 175                         ops->ndo_vlan_rx_register(real_dev, NULL);
 176
 177                 hlist_del_rcu(&grp->hlist);
 178
 179                 /* Free the group, after all cpu's are done. */
 180                 call_rcu(&grp->rcu, vlan_rcu_free);
 181         }
 182
 183         /* Get rid of the vlan's reference to real_dev */
 184         dev_put(real_dev);
 185 }
 186
 187 int vlan_check_real_dev(struct net_device *real_dev, u16 vlan_id)
 188 {
 189         const char *name = real_dev->name;
 190         const struct net_device_ops *ops = real_dev->netdev_ops;
 191
 192         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
 193                 pr_info("8021q: VLANs not supported on %s\n", name);
 194                 return -EOPNOTSUPP;
 195         }
 196
 197         if ((real_dev->features & NETIF_F_HW_VLAN_RX) && !ops->ndo_vlan_rx_register) {
 198                 pr_info("8021q: device %s has buggy VLAN hw accel\n", name);
 199                 return -EOPNOTSUPP;
 200         }
 201
 202         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 203             (!ops->ndo_vlan_rx_add_vid || !ops->ndo_vlan_rx_kill_vid)) {
 204                 pr_info("8021q: Device %s has buggy VLAN hw accel\n", name);
 205                 return -EOPNOTSUPP;
 206         }
 207
 208         if (__find_vlan_dev(real_dev, vlan_id) != NULL)
 209                 return -EEXIST;
 210
 211         return 0;
 212 }
 213
 214 int register_vlan_dev(struct net_device *dev)
 215 {
 216         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 217         struct net_device *real_dev = vlan->real_dev;
 218         const struct net_device_ops *ops = real_dev->netdev_ops;
 219         u16 vlan_id = vlan->vlan_id;
 220         struct vlan_group *grp, *ngrp = NULL;
 221         int err;
 222
 223         grp = __vlan_find_group(real_dev);
 224         if (!grp) {
 225                 ngrp = grp = vlan_group_alloc(real_dev);
 226                 if (!grp)
 227                         return -ENOBUFS;
 228                 err = vlan_gvrp_init_applicant(real_dev);
 229                 if (err < 0)
 230                         goto out_free_group;
 231         }
 232
 233         err = vlan_group_prealloc_vid(grp, vlan_id);
 234         if (err < 0)
 235                 goto out_uninit_applicant;
 236
 237         err = register_netdevice(dev);
 238         if (err < 0)
 239                 goto out_uninit_applicant;
 240
 241         /* Account for reference in struct vlan_dev_info */
 242         dev_hold(real_dev);
 243
 244         netif_stacked_transfer_operstate(real_dev, dev);
 245         linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
 246
 247         /* So, got the sucker initialized, now lets place
 248          * it into our local structure.
 249          */
 250         vlan_group_set_device(grp, vlan_id, dev);
 251         grp->nr_vlans++;
 252
 253         if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX)
 254                 ops->ndo_vlan_rx_register(real_dev, ngrp);
 255         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 256                 ops->ndo_vlan_rx_add_vid(real_dev, vlan_id);
 257
 258         return 0;
 259
 260 out_uninit_applicant:
 261         if (ngrp)
 262                 vlan_gvrp_uninit_applicant(real_dev);
 263 out_free_group:
 264         if (ngrp) {
 265                 hlist_del_rcu(&ngrp->hlist);
 266                 /* Free the group, after all cpu's are done. */
 267                 call_rcu(&ngrp->rcu, vlan_rcu_free);
 268         }
 269         return err;
 270 }
 271
 272 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
 273  *  Returns 0 if the device was created or a negative error code otherwise.
 274  */
 275 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
 276 {
 277         struct net_device *new_dev;
 278         struct net *net = dev_net(real_dev);
 279         struct vlan_net *vn = net_generic(net, vlan_net_id);
 280         char name[IFNAMSIZ];
 281         int err;
 282
 283         if (vlan_id >= VLAN_VID_MASK)
 284                 return -ERANGE;
 285
 286         err = vlan_check_real_dev(real_dev, vlan_id);
 287         if (err < 0)
 288                 return err;
 289
 290         /* Gotta set up the fields for the device. */
 291         switch (vn->name_type) {
 292         case VLAN_NAME_TYPE_RAW_PLUS_VID:
 293                 /* name will look like:  eth1.0005 */
 294                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
 295                 break;
 296         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
 297                 /* Put our vlan.VID in the name.
 298                  * Name will look like:  vlan5
 299                  */
 300                 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
 301                 break;
 302         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
 303                 /* Put our vlan.VID in the name.
 304                  * Name will look like:  eth0.5
 305                  */
 306                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
 307                 break;
 308         case VLAN_NAME_TYPE_PLUS_VID:
 309                 /* Put our vlan.VID in the name.
 310                  * Name will look like:  vlan0005
 311                  */
 312         default:
 313                 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
 314         }
 315
 316         new_dev = alloc_netdev_mq(sizeof(struct vlan_dev_info), name,
 317                                   vlan_setup, real_dev->num_tx_queues);
 318
 319         if (new_dev == NULL)
 320                 return -ENOBUFS;
 321
 322         new_dev->real_num_tx_queues = real_dev->real_num_tx_queues;
 323         dev_net_set(new_dev, net);
 324         /* need 4 bytes for extra VLAN header info,
 325          * hope the underlying device can handle it.
 326          */
 327         new_dev->mtu = real_dev->mtu;
 328
 329         vlan_dev_info(new_dev)->vlan_id = vlan_id;
 330         vlan_dev_info(new_dev)->real_dev = real_dev;
 331         vlan_dev_info(new_dev)->dent = NULL;
 332         vlan_dev_info(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
 333
 334         new_dev->rtnl_link_ops = &vlan_link_ops;
 335         err = register_vlan_dev(new_dev);
 336         if (err < 0)
 337                 goto out_free_newdev;
 338
 339         return 0;
 340
 341 out_free_newdev:
 342         free_netdev(new_dev);
 343         return err;
 344 }
 345
 346 static void vlan_sync_address(struct net_device *dev,
 347                               struct net_device *vlandev)
 348 {
 349         struct vlan_dev_info *vlan = vlan_dev_info(vlandev);
 350
 351         /* May be called without an actual change */
 352         if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
 353                 return;
 354
 355         /* vlan address was different from the old address and is equal to
 356          * the new address */
 357         if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
 358             !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
 359                 dev_uc_del(dev, vlandev->dev_addr);
 360
 361         /* vlan address was equal to the old address and is different from
 362          * the new address */
 363         if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
 364             compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
 365                 dev_uc_add(dev, vlandev->dev_addr);
 366
 367         memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
 368 }
 369
 370 static void vlan_transfer_features(struct net_device *dev,
 371                                    struct net_device *vlandev)
 372 {
 373         unsigned long old_features = vlandev->features;
 374
 375         vlandev->features &= ~dev->vlan_features;
 376         vlandev->features |= dev->features & dev->vlan_features;
 377         vlandev->gso_max_size = dev->gso_max_size;
 378 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 379         vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
 380 #endif
 381
 382         if (old_features != vlandev->features)
 383                 netdev_features_change(vlandev);
 384 }
 385
 386 static void __vlan_device_event(struct net_device *dev, unsigned long event)
 387 {
 388         switch (event) {
 389         case NETDEV_CHANGENAME:
 390                 vlan_proc_rem_dev(dev);
 391                 if (vlan_proc_add_dev(dev) < 0)
 392                         pr_warning("8021q: failed to change proc name for %s\n",
 393                                         dev->name);
 394                 break;
 395         case NETDEV_REGISTER:
 396                 if (vlan_proc_add_dev(dev) < 0)
 397                         pr_warning("8021q: failed to add proc entry for %s\n",
 398                                         dev->name);
 399                 break;
 400         case NETDEV_UNREGISTER:
 401                 vlan_proc_rem_dev(dev);
 402                 break;
 403         }
 404 }
 405
 406 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
 407                              void *ptr)
 408 {
 409         struct net_device *dev = ptr;
 410         struct vlan_group *grp;
 411         int i, flgs;
 412         struct net_device *vlandev;
 413         struct vlan_dev_info *vlan;
 414         LIST_HEAD(list);
 415
 416         if (is_vlan_dev(dev))
 417                 __vlan_device_event(dev, event);
 418
 419         grp = __vlan_find_group(dev);
 420         if (!grp)
 421                 goto out;
 422
 423         /* It is OK that we do not hold the group lock right now,
 424          * as we run under the RTNL lock.
 425          */
 426
 427         switch (event) {
 428         case NETDEV_CHANGE:
 429                 /* Propagate real device state to vlan devices */
 430                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 431                         vlandev = vlan_group_get_device(grp, i);
 432                         if (!vlandev)
 433                                 continue;
 434
 435                         netif_stacked_transfer_operstate(dev, vlandev);
 436                 }
 437                 break;
 438
 439         case NETDEV_CHANGEADDR:
 440                 /* Adjust unicast filters on underlying device */
 441                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 442                         vlandev = vlan_group_get_device(grp, i);
 443                         if (!vlandev)
 444                                 continue;
 445
 446                         flgs = vlandev->flags;
 447                         if (!(flgs & IFF_UP))
 448                                 continue;
 449
 450                         vlan_sync_address(dev, vlandev);
 451                 }
 452                 break;
 453
 454         case NETDEV_CHANGEMTU:
 455                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 456                         vlandev = vlan_group_get_device(grp, i);
 457                         if (!vlandev)
 458                                 continue;
 459
 460                         if (vlandev->mtu <= dev->mtu)
 461                                 continue;
 462
 463                         dev_set_mtu(vlandev, dev->mtu);
 464                 }
 465                 break;
 466
 467         case NETDEV_FEAT_CHANGE:
 468                 /* Propagate device features to underlying device */
 469                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 470                         vlandev = vlan_group_get_device(grp, i);
 471                         if (!vlandev)
 472                                 continue;
 473
 474                         vlan_transfer_features(dev, vlandev);
 475                 }
 476
 477                 break;
 478
 479         case NETDEV_DOWN:
 480                 /* Put all VLANs for this dev in the down state too.  */
 481                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 482                         vlandev = vlan_group_get_device(grp, i);
 483                         if (!vlandev)
 484                                 continue;
 485
 486                         flgs = vlandev->flags;
 487                         if (!(flgs & IFF_UP))
 488                                 continue;
 489
 490                         vlan = vlan_dev_info(vlandev);
 491                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 492                                 dev_change_flags(vlandev, flgs & ~IFF_UP);
 493                         netif_stacked_transfer_operstate(dev, vlandev);
 494                 }
 495                 break;
 496
 497         case NETDEV_UP:
 498                 /* Put all VLANs for this dev in the up state too.  */
 499                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 500                         vlandev = vlan_group_get_device(grp, i);
 501                         if (!vlandev)
 502                                 continue;
 503
 504                         flgs = vlandev->flags;
 505                         if (flgs & IFF_UP)
 506                                 continue;
 507
 508                         vlan = vlan_dev_info(vlandev);
 509                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 510                                 dev_change_flags(vlandev, flgs | IFF_UP);
 511                         netif_stacked_transfer_operstate(dev, vlandev);
 512                 }
 513                 break;
 514
 515         case NETDEV_UNREGISTER:
 516                 /* Delete all VLANs for this dev. */
 517                 grp->killall = 1;
 518
 519                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 520                         vlandev = vlan_group_get_device(grp, i);
 521                         if (!vlandev)
 522                                 continue;
 523
 524                         /* unregistration of last vlan destroys group, abort
 525                          * afterwards */
 526                         if (grp->nr_vlans == 1)
 527                                 i = VLAN_GROUP_ARRAY_LEN;
 528
 529                         unregister_vlan_dev(vlandev, &list);
 530                 }
 531                 unregister_netdevice_many(&list);
 532                 break;
 533
 534         case NETDEV_PRE_TYPE_CHANGE:
 535                 /* Forbid underlaying device to change its type. */
 536                 return NOTIFY_BAD;
 537         }
 538
 539 out:
 540         return NOTIFY_DONE;
 541 }
 542
 543 static struct notifier_block vlan_notifier_block __read_mostly = {
 544         .notifier_call = vlan_device_event,
 545 };
 546
 547 /*
 548  *      VLAN IOCTL handler.
 549  *      o execute requested action or pass command to the device driver
 550  *   arg is really a struct vlan_ioctl_args __user *.
 551  */
 552 static int vlan_ioctl_handler(struct net *net, void __user *arg)
 553 {
 554         int err;
 555         struct vlan_ioctl_args args;
 556         struct net_device *dev = NULL;
 557
 558         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 559                 return -EFAULT;
 560
 561         /* Null terminate this sucker, just in case. */
 562         args.device1[23] = 0;
 563         args.u.device2[23] = 0;
 564
 565         rtnl_lock();
 566
 567         switch (args.cmd) {
 568         case SET_VLAN_INGRESS_PRIORITY_CMD:
 569         case SET_VLAN_EGRESS_PRIORITY_CMD:
 570         case SET_VLAN_FLAG_CMD:
 571         case ADD_VLAN_CMD:
 572         case DEL_VLAN_CMD:
 573         case GET_VLAN_REALDEV_NAME_CMD:
 574         case GET_VLAN_VID_CMD:
 575                 err = -ENODEV;
 576                 dev = __dev_get_by_name(net, args.device1);
 577                 if (!dev)
 578                         goto out;
 579
 580                 err = -EINVAL;
 581                 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
 582                         goto out;
 583         }
 584
 585         switch (args.cmd) {
 586         case SET_VLAN_INGRESS_PRIORITY_CMD:
 587                 err = -EPERM;
 588                 if (!capable(CAP_NET_ADMIN))
 589                         break;
 590                 vlan_dev_set_ingress_priority(dev,
 591                                               args.u.skb_priority,
 592                                               args.vlan_qos);
 593                 err = 0;
 594                 break;
 595
 596         case SET_VLAN_EGRESS_PRIORITY_CMD:
 597                 err = -EPERM;
 598                 if (!capable(CAP_NET_ADMIN))
 599                         break;
 600                 err = vlan_dev_set_egress_priority(dev,
 601                                                    args.u.skb_priority,
 602                                                    args.vlan_qos);
 603                 break;
 604
 605         case SET_VLAN_FLAG_CMD:
 606                 err = -EPERM;
 607                 if (!capable(CAP_NET_ADMIN))
 608                         break;
 609                 err = vlan_dev_change_flags(dev,
 610                                             args.vlan_qos ? args.u.flag : 0,
 611                                             args.u.flag);
 612                 break;
 613
 614         case SET_VLAN_NAME_TYPE_CMD:
 615                 err = -EPERM;
 616                 if (!capable(CAP_NET_ADMIN))
 617                         break;
 618                 if ((args.u.name_type >= 0) &&
 619                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
 620                         struct vlan_net *vn;
 621
 622                         vn = net_generic(net, vlan_net_id);
 623                         vn->name_type = args.u.name_type;
 624                         err = 0;
 625                 } else {
 626                         err = -EINVAL;
 627                 }
 628                 break;
 629
 630         case ADD_VLAN_CMD:
 631                 err = -EPERM;
 632                 if (!capable(CAP_NET_ADMIN))
 633                         break;
 634                 err = register_vlan_device(dev, args.u.VID);
 635                 break;
 636
 637         case DEL_VLAN_CMD:
 638                 err = -EPERM;
 639                 if (!capable(CAP_NET_ADMIN))
 640                         break;
 641                 unregister_vlan_dev(dev, NULL);
 642                 err = 0;
 643                 break;
 644
 645         case GET_VLAN_REALDEV_NAME_CMD:
 646                 err = 0;
 647                 vlan_dev_get_realdev_name(dev, args.u.device2);
 648                 if (copy_to_user(arg, &args,
 649                                  sizeof(struct vlan_ioctl_args)))
 650                         err = -EFAULT;
 651                 break;
 652
 653         case GET_VLAN_VID_CMD:
 654                 err = 0;
 655                 args.u.VID = vlan_dev_vlan_id(dev);
 656                 if (copy_to_user(arg, &args,
 657                                  sizeof(struct vlan_ioctl_args)))
 658                       err = -EFAULT;
 659                 break;
 660
 661         default:
 662                 err = -EOPNOTSUPP;
 663                 break;
 664         }
 665 out:
 666         rtnl_unlock();
 667         return err;
 668 }
 669
 670 static int __net_init vlan_init_net(struct net *net)
 671 {
 672         struct vlan_net *vn = net_generic(net, vlan_net_id);
 673         int err;
 674
 675         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
 676
 677         err = vlan_proc_init(net);
 678
 679         return err;
 680 }
 681
 682 static void __net_exit vlan_exit_net(struct net *net)
 683 {
 684         vlan_proc_cleanup(net);
 685 }
 686
 687 static struct pernet_operations vlan_net_ops = {
 688         .init = vlan_init_net,
 689         .exit = vlan_exit_net,
 690         .id   = &vlan_net_id,
 691         .size = sizeof(struct vlan_net),
 692 };
 693
 694 static int __init vlan_proto_init(void)
 695 {
 696         int err;
 697
 698         pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright);
 699         pr_info("All bugs added by %s\n", vlan_buggyright);
 700
 701         err = register_pernet_subsys(&vlan_net_ops);
 702         if (err < 0)
 703                 goto err0;
 704
 705         err = register_netdevice_notifier(&vlan_notifier_block);
 706         if (err < 0)
 707                 goto err2;
 708
 709         err = vlan_gvrp_init();
 710         if (err < 0)
 711                 goto err3;
 712
 713         err = vlan_netlink_init();
 714         if (err < 0)
 715                 goto err4;
 716
 717         dev_add_pack(&vlan_packet_type);
 718         vlan_ioctl_set(vlan_ioctl_handler);
 719         return 0;
 720
 721 err4:
 722         vlan_gvrp_uninit();
 723 err3:
 724         unregister_netdevice_notifier(&vlan_notifier_block);
 725 err2:
 726         unregister_pernet_subsys(&vlan_net_ops);
 727 err0:
 728         return err;
 729 }
 730
 731 static void __exit vlan_cleanup_module(void)
 732 {
 733         unsigned int i;
 734
 735         vlan_ioctl_set(NULL);
 736         vlan_netlink_fini();
 737
 738         unregister_netdevice_notifier(&vlan_notifier_block);
 739
 740         dev_remove_pack(&vlan_packet_type);
 741
 742         /* This table must be empty if there are no module references left. */
 743         for (i = 0; i < VLAN_GRP_HASH_SIZE; i++)
 744                 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
 745
 746         unregister_pernet_subsys(&vlan_net_ops);
 747         rcu_barrier(); /* Wait for completion of call_rcu()'s */
 748
 749         vlan_gvrp_uninit();
 750 }
 751
 752 module_init(vlan_proto_init);
 753 module_exit(vlan_cleanup_module);
 754
 755 MODULE_LICENSE("GPL");
 756 MODULE_VERSION(DRV_VERSION);