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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 static void vlan_transfer_operstate(const struct net_device *dev,
 188                                     struct net_device *vlandev)
 189 {
 190         /* Have to respect userspace enforced dormant state
 191          * of real device, also must allow supplicant running
 192          * on VLAN device
 193          */
 194         if (dev->operstate == IF_OPER_DORMANT)
 195                 netif_dormant_on(vlandev);
 196         else
 197                 netif_dormant_off(vlandev);
 198
 199         if (netif_carrier_ok(dev)) {
 200                 if (!netif_carrier_ok(vlandev))
 201                         netif_carrier_on(vlandev);
 202         } else {
 203                 if (netif_carrier_ok(vlandev))
 204                         netif_carrier_off(vlandev);
 205         }
 206 }
 207
 208 int vlan_check_real_dev(struct net_device *real_dev, u16 vlan_id)
 209 {
 210         const char *name = real_dev->name;
 211         const struct net_device_ops *ops = real_dev->netdev_ops;
 212
 213         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
 214                 pr_info("8021q: VLANs not supported on %s\n", name);
 215                 return -EOPNOTSUPP;
 216         }
 217
 218         if ((real_dev->features & NETIF_F_HW_VLAN_RX) && !ops->ndo_vlan_rx_register) {
 219                 pr_info("8021q: device %s has buggy VLAN hw accel\n", name);
 220                 return -EOPNOTSUPP;
 221         }
 222
 223         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 224             (!ops->ndo_vlan_rx_add_vid || !ops->ndo_vlan_rx_kill_vid)) {
 225                 pr_info("8021q: Device %s has buggy VLAN hw accel\n", name);
 226                 return -EOPNOTSUPP;
 227         }
 228
 229         if (__find_vlan_dev(real_dev, vlan_id) != NULL)
 230                 return -EEXIST;
 231
 232         return 0;
 233 }
 234
 235 int register_vlan_dev(struct net_device *dev)
 236 {
 237         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 238         struct net_device *real_dev = vlan->real_dev;
 239         const struct net_device_ops *ops = real_dev->netdev_ops;
 240         u16 vlan_id = vlan->vlan_id;
 241         struct vlan_group *grp, *ngrp = NULL;
 242         int err;
 243
 244         grp = __vlan_find_group(real_dev);
 245         if (!grp) {
 246                 ngrp = grp = vlan_group_alloc(real_dev);
 247                 if (!grp)
 248                         return -ENOBUFS;
 249                 err = vlan_gvrp_init_applicant(real_dev);
 250                 if (err < 0)
 251                         goto out_free_group;
 252         }
 253
 254         err = vlan_group_prealloc_vid(grp, vlan_id);
 255         if (err < 0)
 256                 goto out_uninit_applicant;
 257
 258         err = register_netdevice(dev);
 259         if (err < 0)
 260                 goto out_uninit_applicant;
 261
 262         /* Account for reference in struct vlan_dev_info */
 263         dev_hold(real_dev);
 264
 265         vlan_transfer_operstate(real_dev, dev);
 266         linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
 267
 268         /* So, got the sucker initialized, now lets place
 269          * it into our local structure.
 270          */
 271         vlan_group_set_device(grp, vlan_id, dev);
 272         grp->nr_vlans++;
 273
 274         if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX)
 275                 ops->ndo_vlan_rx_register(real_dev, ngrp);
 276         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 277                 ops->ndo_vlan_rx_add_vid(real_dev, vlan_id);
 278
 279         return 0;
 280
 281 out_uninit_applicant:
 282         if (ngrp)
 283                 vlan_gvrp_uninit_applicant(real_dev);
 284 out_free_group:
 285         if (ngrp)
 286                 vlan_group_free(ngrp);
 287         return err;
 288 }
 289
 290 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
 291  *  Returns 0 if the device was created or a negative error code otherwise.
 292  */
 293 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
 294 {
 295         struct net_device *new_dev;
 296         struct net *net = dev_net(real_dev);
 297         struct vlan_net *vn = net_generic(net, vlan_net_id);
 298         char name[IFNAMSIZ];
 299         int err;
 300
 301         if (vlan_id >= VLAN_VID_MASK)
 302                 return -ERANGE;
 303
 304         err = vlan_check_real_dev(real_dev, vlan_id);
 305         if (err < 0)
 306                 return err;
 307
 308         /* Gotta set up the fields for the device. */
 309         switch (vn->name_type) {
 310         case VLAN_NAME_TYPE_RAW_PLUS_VID:
 311                 /* name will look like:  eth1.0005 */
 312                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
 313                 break;
 314         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
 315                 /* Put our vlan.VID in the name.
 316                  * Name will look like:  vlan5
 317                  */
 318                 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
 319                 break;
 320         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
 321                 /* Put our vlan.VID in the name.
 322                  * Name will look like:  eth0.5
 323                  */
 324                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
 325                 break;
 326         case VLAN_NAME_TYPE_PLUS_VID:
 327                 /* Put our vlan.VID in the name.
 328                  * Name will look like:  vlan0005
 329                  */
 330         default:
 331                 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
 332         }
 333
 334         new_dev = alloc_netdev_mq(sizeof(struct vlan_dev_info), name,
 335                                   vlan_setup, real_dev->num_tx_queues);
 336
 337         if (new_dev == NULL)
 338                 return -ENOBUFS;
 339
 340         new_dev->real_num_tx_queues = real_dev->real_num_tx_queues;
 341         dev_net_set(new_dev, net);
 342         /* need 4 bytes for extra VLAN header info,
 343          * hope the underlying device can handle it.
 344          */
 345         new_dev->mtu = real_dev->mtu;
 346
 347         vlan_dev_info(new_dev)->vlan_id = vlan_id;
 348         vlan_dev_info(new_dev)->real_dev = real_dev;
 349         vlan_dev_info(new_dev)->dent = NULL;
 350         vlan_dev_info(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
 351
 352         new_dev->rtnl_link_ops = &vlan_link_ops;
 353         err = register_vlan_dev(new_dev);
 354         if (err < 0)
 355                 goto out_free_newdev;
 356
 357         return 0;
 358
 359 out_free_newdev:
 360         free_netdev(new_dev);
 361         return err;
 362 }
 363
 364 static void vlan_sync_address(struct net_device *dev,
 365                               struct net_device *vlandev)
 366 {
 367         struct vlan_dev_info *vlan = vlan_dev_info(vlandev);
 368
 369         /* May be called without an actual change */
 370         if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
 371                 return;
 372
 373         /* vlan address was different from the old address and is equal to
 374          * the new address */
 375         if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
 376             !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
 377                 dev_unicast_delete(dev, vlandev->dev_addr);
 378
 379         /* vlan address was equal to the old address and is different from
 380          * the new address */
 381         if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
 382             compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
 383                 dev_unicast_add(dev, vlandev->dev_addr);
 384
 385         memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
 386 }
 387
 388 static void vlan_transfer_features(struct net_device *dev,
 389                                    struct net_device *vlandev)
 390 {
 391         unsigned long old_features = vlandev->features;
 392
 393         vlandev->features &= ~dev->vlan_features;
 394         vlandev->features |= dev->features & dev->vlan_features;
 395         vlandev->gso_max_size = dev->gso_max_size;
 396 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 397         vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
 398 #endif
 399
 400         if (old_features != vlandev->features)
 401                 netdev_features_change(vlandev);
 402 }
 403
 404 static void __vlan_device_event(struct net_device *dev, unsigned long event)
 405 {
 406         switch (event) {
 407         case NETDEV_CHANGENAME:
 408                 vlan_proc_rem_dev(dev);
 409                 if (vlan_proc_add_dev(dev) < 0)
 410                         pr_warning("8021q: failed to change proc name for %s\n",
 411                                         dev->name);
 412                 break;
 413         case NETDEV_REGISTER:
 414                 if (vlan_proc_add_dev(dev) < 0)
 415                         pr_warning("8021q: failed to add proc entry for %s\n",
 416                                         dev->name);
 417                 break;
 418         case NETDEV_UNREGISTER:
 419                 vlan_proc_rem_dev(dev);
 420                 break;
 421         }
 422 }
 423
 424 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
 425                              void *ptr)
 426 {
 427         struct net_device *dev = ptr;
 428         struct vlan_group *grp;
 429         int i, flgs;
 430         struct net_device *vlandev;
 431         LIST_HEAD(list);
 432
 433         if (is_vlan_dev(dev))
 434                 __vlan_device_event(dev, event);
 435
 436         grp = __vlan_find_group(dev);
 437         if (!grp)
 438                 goto out;
 439
 440         /* It is OK that we do not hold the group lock right now,
 441          * as we run under the RTNL lock.
 442          */
 443
 444         switch (event) {
 445         case NETDEV_CHANGE:
 446                 /* Propagate real device state to vlan devices */
 447                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 448                         vlandev = vlan_group_get_device(grp, i);
 449                         if (!vlandev)
 450                                 continue;
 451
 452                         vlan_transfer_operstate(dev, vlandev);
 453                 }
 454                 break;
 455
 456         case NETDEV_CHANGEADDR:
 457                 /* Adjust unicast filters on underlying device */
 458                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 459                         vlandev = vlan_group_get_device(grp, i);
 460                         if (!vlandev)
 461                                 continue;
 462
 463                         flgs = vlandev->flags;
 464                         if (!(flgs & IFF_UP))
 465                                 continue;
 466
 467                         vlan_sync_address(dev, vlandev);
 468                 }
 469                 break;
 470
 471         case NETDEV_CHANGEMTU:
 472                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 473                         vlandev = vlan_group_get_device(grp, i);
 474                         if (!vlandev)
 475                                 continue;
 476
 477                         if (vlandev->mtu <= dev->mtu)
 478                                 continue;
 479
 480                         dev_set_mtu(vlandev, dev->mtu);
 481                 }
 482                 break;
 483
 484         case NETDEV_FEAT_CHANGE:
 485                 /* Propagate device features to underlying device */
 486                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 487                         vlandev = vlan_group_get_device(grp, i);
 488                         if (!vlandev)
 489                                 continue;
 490
 491                         vlan_transfer_features(dev, vlandev);
 492                 }
 493
 494                 break;
 495
 496         case NETDEV_DOWN:
 497                 /* Put all VLANs for this dev in the down state too.  */
 498                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 499                         vlandev = vlan_group_get_device(grp, i);
 500                         if (!vlandev)
 501                                 continue;
 502
 503                         flgs = vlandev->flags;
 504                         if (!(flgs & IFF_UP))
 505                                 continue;
 506
 507                         dev_change_flags(vlandev, flgs & ~IFF_UP);
 508                         vlan_transfer_operstate(dev, vlandev);
 509                 }
 510                 break;
 511
 512         case NETDEV_UP:
 513                 /* Put all VLANs for this dev in the up state too.  */
 514                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 515                         vlandev = vlan_group_get_device(grp, i);
 516                         if (!vlandev)
 517                                 continue;
 518
 519                         flgs = vlandev->flags;
 520                         if (flgs & IFF_UP)
 521                                 continue;
 522
 523                         dev_change_flags(vlandev, flgs | IFF_UP);
 524                         vlan_transfer_operstate(dev, vlandev);
 525                 }
 526                 break;
 527
 528         case NETDEV_UNREGISTER:
 529                 /* Delete all VLANs for this dev. */
 530                 grp->killall = 1;
 531
 532                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 533                         vlandev = vlan_group_get_device(grp, i);
 534                         if (!vlandev)
 535                                 continue;
 536
 537                         /* unregistration of last vlan destroys group, abort
 538                          * afterwards */
 539                         if (grp->nr_vlans == 1)
 540                                 i = VLAN_GROUP_ARRAY_LEN;
 541
 542                         unregister_vlan_dev(vlandev, &list);
 543                 }
 544                 unregister_netdevice_many(&list);
 545                 break;
 546         }
 547
 548 out:
 549         return NOTIFY_DONE;
 550 }
 551
 552 static struct notifier_block vlan_notifier_block __read_mostly = {
 553         .notifier_call = vlan_device_event,
 554 };
 555
 556 /*
 557  *      VLAN IOCTL handler.
 558  *      o execute requested action or pass command to the device driver
 559  *   arg is really a struct vlan_ioctl_args __user *.
 560  */
 561 static int vlan_ioctl_handler(struct net *net, void __user *arg)
 562 {
 563         int err;
 564         struct vlan_ioctl_args args;
 565         struct net_device *dev = NULL;
 566
 567         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 568                 return -EFAULT;
 569
 570         /* Null terminate this sucker, just in case. */
 571         args.device1[23] = 0;
 572         args.u.device2[23] = 0;
 573
 574         rtnl_lock();
 575
 576         switch (args.cmd) {
 577         case SET_VLAN_INGRESS_PRIORITY_CMD:
 578         case SET_VLAN_EGRESS_PRIORITY_CMD:
 579         case SET_VLAN_FLAG_CMD:
 580         case ADD_VLAN_CMD:
 581         case DEL_VLAN_CMD:
 582         case GET_VLAN_REALDEV_NAME_CMD:
 583         case GET_VLAN_VID_CMD:
 584                 err = -ENODEV;
 585                 dev = __dev_get_by_name(net, args.device1);
 586                 if (!dev)
 587                         goto out;
 588
 589                 err = -EINVAL;
 590                 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
 591                         goto out;
 592         }
 593
 594         switch (args.cmd) {
 595         case SET_VLAN_INGRESS_PRIORITY_CMD:
 596                 err = -EPERM;
 597                 if (!capable(CAP_NET_ADMIN))
 598                         break;
 599                 vlan_dev_set_ingress_priority(dev,
 600                                               args.u.skb_priority,
 601                                               args.vlan_qos);
 602                 err = 0;
 603                 break;
 604
 605         case SET_VLAN_EGRESS_PRIORITY_CMD:
 606                 err = -EPERM;
 607                 if (!capable(CAP_NET_ADMIN))
 608                         break;
 609                 err = vlan_dev_set_egress_priority(dev,
 610                                                    args.u.skb_priority,
 611                                                    args.vlan_qos);
 612                 break;
 613
 614         case SET_VLAN_FLAG_CMD:
 615                 err = -EPERM;
 616                 if (!capable(CAP_NET_ADMIN))
 617                         break;
 618                 err = vlan_dev_change_flags(dev,
 619                                             args.vlan_qos ? args.u.flag : 0,
 620                                             args.u.flag);
 621                 break;
 622
 623         case SET_VLAN_NAME_TYPE_CMD:
 624                 err = -EPERM;
 625                 if (!capable(CAP_NET_ADMIN))
 626                         break;
 627                 if ((args.u.name_type >= 0) &&
 628                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
 629                         struct vlan_net *vn;
 630
 631                         vn = net_generic(net, vlan_net_id);
 632                         vn->name_type = args.u.name_type;
 633                         err = 0;
 634                 } else {
 635                         err = -EINVAL;
 636                 }
 637                 break;
 638
 639         case ADD_VLAN_CMD:
 640                 err = -EPERM;
 641                 if (!capable(CAP_NET_ADMIN))
 642                         break;
 643                 err = register_vlan_device(dev, args.u.VID);
 644                 break;
 645
 646         case DEL_VLAN_CMD:
 647                 err = -EPERM;
 648                 if (!capable(CAP_NET_ADMIN))
 649                         break;
 650                 unregister_vlan_dev(dev, NULL);
 651                 err = 0;
 652                 break;
 653
 654         case GET_VLAN_REALDEV_NAME_CMD:
 655                 err = 0;
 656                 vlan_dev_get_realdev_name(dev, args.u.device2);
 657                 if (copy_to_user(arg, &args,
 658                                  sizeof(struct vlan_ioctl_args)))
 659                         err = -EFAULT;
 660                 break;
 661
 662         case GET_VLAN_VID_CMD:
 663                 err = 0;
 664                 args.u.VID = vlan_dev_vlan_id(dev);
 665                 if (copy_to_user(arg, &args,
 666                                  sizeof(struct vlan_ioctl_args)))
 667                       err = -EFAULT;
 668                 break;
 669
 670         default:
 671                 err = -EOPNOTSUPP;
 672                 break;
 673         }
 674 out:
 675         rtnl_unlock();
 676         return err;
 677 }
 678
 679 static int vlan_init_net(struct net *net)
 680 {
 681         int err;
 682         struct vlan_net *vn;
 683
 684         err = -ENOMEM;
 685         vn = kzalloc(sizeof(struct vlan_net), GFP_KERNEL);
 686         if (vn == NULL)
 687                 goto err_alloc;
 688
 689         err = net_assign_generic(net, vlan_net_id, vn);
 690         if (err < 0)
 691                 goto err_assign;
 692
 693         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
 694
 695         err = vlan_proc_init(net);
 696         if (err < 0)
 697                 goto err_proc;
 698
 699         return 0;
 700
 701 err_proc:
 702         /* nothing */
 703 err_assign:
 704         kfree(vn);
 705 err_alloc:
 706         return err;
 707 }
 708
 709 static void vlan_exit_net(struct net *net)
 710 {
 711         struct vlan_net *vn;
 712
 713         vn = net_generic(net, vlan_net_id);
 714         rtnl_kill_links(net, &vlan_link_ops);
 715         vlan_proc_cleanup(net);
 716         kfree(vn);
 717 }
 718
 719 static struct pernet_operations vlan_net_ops = {
 720         .init = vlan_init_net,
 721         .exit = vlan_exit_net,
 722 };
 723
 724 static int __init vlan_proto_init(void)
 725 {
 726         int err;
 727
 728         pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright);
 729         pr_info("All bugs added by %s\n", vlan_buggyright);
 730
 731         err = register_pernet_gen_device(&vlan_net_id, &vlan_net_ops);
 732         if (err < 0)
 733                 goto err0;
 734
 735         err = register_netdevice_notifier(&vlan_notifier_block);
 736         if (err < 0)
 737                 goto err2;
 738
 739         err = vlan_gvrp_init();
 740         if (err < 0)
 741                 goto err3;
 742
 743         err = vlan_netlink_init();
 744         if (err < 0)
 745                 goto err4;
 746
 747         dev_add_pack(&vlan_packet_type);
 748         vlan_ioctl_set(vlan_ioctl_handler);
 749         return 0;
 750
 751 err4:
 752         vlan_gvrp_uninit();
 753 err3:
 754         unregister_netdevice_notifier(&vlan_notifier_block);
 755 err2:
 756         unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
 757 err0:
 758         return err;
 759 }
 760
 761 static void __exit vlan_cleanup_module(void)
 762 {
 763         unsigned int i;
 764
 765         vlan_ioctl_set(NULL);
 766         vlan_netlink_fini();
 767
 768         unregister_netdevice_notifier(&vlan_notifier_block);
 769
 770         dev_remove_pack(&vlan_packet_type);
 771
 772         /* This table must be empty if there are no module references left. */
 773         for (i = 0; i < VLAN_GRP_HASH_SIZE; i++)
 774                 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
 775
 776         unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
 777         rcu_barrier(); /* Wait for completion of call_rcu()'s */
 778
 779         vlan_gvrp_uninit();
 780 }
 781
 782 module_init(vlan_proto_init);
 783 module_exit(vlan_cleanup_module);
 784
 785 MODULE_LICENSE("GPL");
 786 MODULE_VERSION(DRV_VERSION);