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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_unicast_delete(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_unicast_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         vlandev->real_num_tx_queues = dev->real_num_tx_queues;
 382         BUG_ON(vlandev->real_num_tx_queues > vlandev->num_tx_queues);
 383
 384         if (old_features != vlandev->features)
 385                 netdev_features_change(vlandev);
 386 }
 387
 388 static void __vlan_device_event(struct net_device *dev, unsigned long event)
 389 {
 390         switch (event) {
 391         case NETDEV_CHANGENAME:
 392                 vlan_proc_rem_dev(dev);
 393                 if (vlan_proc_add_dev(dev) < 0)
 394                         pr_warning("8021q: failed to change proc name for %s\n",
 395                                         dev->name);
 396                 break;
 397         case NETDEV_REGISTER:
 398                 if (vlan_proc_add_dev(dev) < 0)
 399                         pr_warning("8021q: failed to add proc entry for %s\n",
 400                                         dev->name);
 401                 break;
 402         case NETDEV_UNREGISTER:
 403                 vlan_proc_rem_dev(dev);
 404                 break;
 405         }
 406 }
 407
 408 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
 409                              void *ptr)
 410 {
 411         struct net_device *dev = ptr;
 412         struct vlan_group *grp;
 413         int i, flgs;
 414         struct net_device *vlandev;
 415         struct vlan_dev_info *vlan;
 416         LIST_HEAD(list);
 417
 418         if (is_vlan_dev(dev))
 419                 __vlan_device_event(dev, event);
 420
 421         grp = __vlan_find_group(dev);
 422         if (!grp)
 423                 goto out;
 424
 425         /* It is OK that we do not hold the group lock right now,
 426          * as we run under the RTNL lock.
 427          */
 428
 429         switch (event) {
 430         case NETDEV_CHANGE:
 431                 /* Propagate real device state to vlan devices */
 432                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 433                         vlandev = vlan_group_get_device(grp, i);
 434                         if (!vlandev)
 435                                 continue;
 436
 437                         netif_stacked_transfer_operstate(dev, vlandev);
 438                 }
 439                 break;
 440
 441         case NETDEV_CHANGEADDR:
 442                 /* Adjust unicast filters on underlying device */
 443                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 444                         vlandev = vlan_group_get_device(grp, i);
 445                         if (!vlandev)
 446                                 continue;
 447
 448                         flgs = vlandev->flags;
 449                         if (!(flgs & IFF_UP))
 450                                 continue;
 451
 452                         vlan_sync_address(dev, vlandev);
 453                 }
 454                 break;
 455
 456         case NETDEV_CHANGEMTU:
 457                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 458                         vlandev = vlan_group_get_device(grp, i);
 459                         if (!vlandev)
 460                                 continue;
 461
 462                         if (vlandev->mtu <= dev->mtu)
 463                                 continue;
 464
 465                         dev_set_mtu(vlandev, dev->mtu);
 466                 }
 467                 break;
 468
 469         case NETDEV_FEAT_CHANGE:
 470                 /* Propagate device features to underlying device */
 471                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 472                         vlandev = vlan_group_get_device(grp, i);
 473                         if (!vlandev)
 474                                 continue;
 475
 476                         vlan_transfer_features(dev, vlandev);
 477                 }
 478
 479                 break;
 480
 481         case NETDEV_DOWN:
 482                 /* Put all VLANs for this dev in the down state too.  */
 483                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 484                         vlandev = vlan_group_get_device(grp, i);
 485                         if (!vlandev)
 486                                 continue;
 487
 488                         flgs = vlandev->flags;
 489                         if (!(flgs & IFF_UP))
 490                                 continue;
 491
 492                         vlan = vlan_dev_info(vlandev);
 493                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 494                                 dev_change_flags(vlandev, flgs & ~IFF_UP);
 495                         netif_stacked_transfer_operstate(dev, vlandev);
 496                 }
 497                 break;
 498
 499         case NETDEV_UP:
 500                 /* Put all VLANs for this dev in the up state too.  */
 501                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 502                         vlandev = vlan_group_get_device(grp, i);
 503                         if (!vlandev)
 504                                 continue;
 505
 506                         flgs = vlandev->flags;
 507                         if (flgs & IFF_UP)
 508                                 continue;
 509
 510                         vlan = vlan_dev_info(vlandev);
 511                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 512                                 dev_change_flags(vlandev, flgs | IFF_UP);
 513                         netif_stacked_transfer_operstate(dev, vlandev);
 514                 }
 515                 break;
 516
 517         case NETDEV_UNREGISTER:
 518                 /* Delete all VLANs for this dev. */
 519                 grp->killall = 1;
 520
 521                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 522                         vlandev = vlan_group_get_device(grp, i);
 523                         if (!vlandev)
 524                                 continue;
 525
 526                         /* unregistration of last vlan destroys group, abort
 527                          * afterwards */
 528                         if (grp->nr_vlans == 1)
 529                                 i = VLAN_GROUP_ARRAY_LEN;
 530
 531                         unregister_vlan_dev(vlandev, &list);
 532                 }
 533                 unregister_netdevice_many(&list);
 534                 break;
 535         }
 536
 537 out:
 538         return NOTIFY_DONE;
 539 }
 540
 541 static struct notifier_block vlan_notifier_block __read_mostly = {
 542         .notifier_call = vlan_device_event,
 543 };
 544
 545 /*
 546  *      VLAN IOCTL handler.
 547  *      o execute requested action or pass command to the device driver
 548  *   arg is really a struct vlan_ioctl_args __user *.
 549  */
 550 static int vlan_ioctl_handler(struct net *net, void __user *arg)
 551 {
 552         int err;
 553         struct vlan_ioctl_args args;
 554         struct net_device *dev = NULL;
 555
 556         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 557                 return -EFAULT;
 558
 559         /* Null terminate this sucker, just in case. */
 560         args.device1[23] = 0;
 561         args.u.device2[23] = 0;
 562
 563         rtnl_lock();
 564
 565         switch (args.cmd) {
 566         case SET_VLAN_INGRESS_PRIORITY_CMD:
 567         case SET_VLAN_EGRESS_PRIORITY_CMD:
 568         case SET_VLAN_FLAG_CMD:
 569         case ADD_VLAN_CMD:
 570         case DEL_VLAN_CMD:
 571         case GET_VLAN_REALDEV_NAME_CMD:
 572         case GET_VLAN_VID_CMD:
 573                 err = -ENODEV;
 574                 dev = __dev_get_by_name(net, args.device1);
 575                 if (!dev)
 576                         goto out;
 577
 578                 err = -EINVAL;
 579                 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
 580                         goto out;
 581         }
 582
 583         switch (args.cmd) {
 584         case SET_VLAN_INGRESS_PRIORITY_CMD:
 585                 err = -EPERM;
 586                 if (!capable(CAP_NET_ADMIN))
 587                         break;
 588                 vlan_dev_set_ingress_priority(dev,
 589                                               args.u.skb_priority,
 590                                               args.vlan_qos);
 591                 err = 0;
 592                 break;
 593
 594         case SET_VLAN_EGRESS_PRIORITY_CMD:
 595                 err = -EPERM;
 596                 if (!capable(CAP_NET_ADMIN))
 597                         break;
 598                 err = vlan_dev_set_egress_priority(dev,
 599                                                    args.u.skb_priority,
 600                                                    args.vlan_qos);
 601                 break;
 602
 603         case SET_VLAN_FLAG_CMD:
 604                 err = -EPERM;
 605                 if (!capable(CAP_NET_ADMIN))
 606                         break;
 607                 err = vlan_dev_change_flags(dev,
 608                                             args.vlan_qos ? args.u.flag : 0,
 609                                             args.u.flag);
 610                 break;
 611
 612         case SET_VLAN_NAME_TYPE_CMD:
 613                 err = -EPERM;
 614                 if (!capable(CAP_NET_ADMIN))
 615                         break;
 616                 if ((args.u.name_type >= 0) &&
 617                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
 618                         struct vlan_net *vn;
 619
 620                         vn = net_generic(net, vlan_net_id);
 621                         vn->name_type = args.u.name_type;
 622                         err = 0;
 623                 } else {
 624                         err = -EINVAL;
 625                 }
 626                 break;
 627
 628         case ADD_VLAN_CMD:
 629                 err = -EPERM;
 630                 if (!capable(CAP_NET_ADMIN))
 631                         break;
 632                 err = register_vlan_device(dev, args.u.VID);
 633                 break;
 634
 635         case DEL_VLAN_CMD:
 636                 err = -EPERM;
 637                 if (!capable(CAP_NET_ADMIN))
 638                         break;
 639                 unregister_vlan_dev(dev, NULL);
 640                 err = 0;
 641                 break;
 642
 643         case GET_VLAN_REALDEV_NAME_CMD:
 644                 err = 0;
 645                 vlan_dev_get_realdev_name(dev, args.u.device2);
 646                 if (copy_to_user(arg, &args,
 647                                  sizeof(struct vlan_ioctl_args)))
 648                         err = -EFAULT;
 649                 break;
 650
 651         case GET_VLAN_VID_CMD:
 652                 err = 0;
 653                 args.u.VID = vlan_dev_vlan_id(dev);
 654                 if (copy_to_user(arg, &args,
 655                                  sizeof(struct vlan_ioctl_args)))
 656                       err = -EFAULT;
 657                 break;
 658
 659         default:
 660                 err = -EOPNOTSUPP;
 661                 break;
 662         }
 663 out:
 664         rtnl_unlock();
 665         return err;
 666 }
 667
 668 static int __net_init vlan_init_net(struct net *net)
 669 {
 670         struct vlan_net *vn = net_generic(net, vlan_net_id);
 671         int err;
 672
 673         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
 674
 675         err = vlan_proc_init(net);
 676
 677         return err;
 678 }
 679
 680 static void __net_exit vlan_exit_net(struct net *net)
 681 {
 682         vlan_proc_cleanup(net);
 683 }
 684
 685 static struct pernet_operations vlan_net_ops = {
 686         .init = vlan_init_net,
 687         .exit = vlan_exit_net,
 688         .id   = &vlan_net_id,
 689         .size = sizeof(struct vlan_net),
 690 };
 691
 692 static int __init vlan_proto_init(void)
 693 {
 694         int err;
 695
 696         pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright);
 697         pr_info("All bugs added by %s\n", vlan_buggyright);
 698
 699         err = register_pernet_subsys(&vlan_net_ops);
 700         if (err < 0)
 701                 goto err0;
 702
 703         err = register_netdevice_notifier(&vlan_notifier_block);
 704         if (err < 0)
 705                 goto err2;
 706
 707         err = vlan_gvrp_init();
 708         if (err < 0)
 709                 goto err3;
 710
 711         err = vlan_netlink_init();
 712         if (err < 0)
 713                 goto err4;
 714
 715         dev_add_pack(&vlan_packet_type);
 716         vlan_ioctl_set(vlan_ioctl_handler);
 717         return 0;
 718
 719 err4:
 720         vlan_gvrp_uninit();
 721 err3:
 722         unregister_netdevice_notifier(&vlan_notifier_block);
 723 err2:
 724         unregister_pernet_subsys(&vlan_net_ops);
 725 err0:
 726         return err;
 727 }
 728
 729 static void __exit vlan_cleanup_module(void)
 730 {
 731         unsigned int i;
 732
 733         vlan_ioctl_set(NULL);
 734         vlan_netlink_fini();
 735
 736         unregister_netdevice_notifier(&vlan_notifier_block);
 737
 738         dev_remove_pack(&vlan_packet_type);
 739
 740         /* This table must be empty if there are no module references left. */
 741         for (i = 0; i < VLAN_GRP_HASH_SIZE; i++)
 742                 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
 743
 744         unregister_pernet_subsys(&vlan_net_ops);
 745         rcu_barrier(); /* Wait for completion of call_rcu()'s */
 746
 747         vlan_gvrp_uninit();
 748 }
 749
 750 module_init(vlan_proto_init);
 751 module_exit(vlan_cleanup_module);
 752
 753 MODULE_LICENSE("GPL");
 754 MODULE_VERSION(DRV_VERSION);