net/8021q/vlan.c

   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;
  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)
 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         vlan_group_set_device(grp, vlan_id, NULL);
 163         grp->nr_vlans--;
 164
 165         synchronize_net();
 166
 167         unregister_netdevice(dev);
 168
 169         /* If the group is now empty, kill off the group. */
 170         if (grp->nr_vlans == 0) {
 171                 vlan_gvrp_uninit_applicant(real_dev);
 172
 173                 if (real_dev->features & NETIF_F_HW_VLAN_RX)
 174                         ops->ndo_vlan_rx_register(real_dev, NULL);
 175
 176                 hlist_del_rcu(&grp->hlist);
 177
 178                 /* Free the group, after all cpu's are done. */
 179                 call_rcu(&grp->rcu, vlan_rcu_free);
 180         }
 181
 182         /* Get rid of the vlan's reference to real_dev */
 183         dev_put(real_dev);
 184 }
 185
 186 static void vlan_transfer_operstate(const struct net_device *dev,
 187                                     struct net_device *vlandev)
 188 {
 189         /* Have to respect userspace enforced dormant state
 190          * of real device, also must allow supplicant running
 191          * on VLAN device
 192          */
 193         if (dev->operstate == IF_OPER_DORMANT)
 194                 netif_dormant_on(vlandev);
 195         else
 196                 netif_dormant_off(vlandev);
 197
 198         if (netif_carrier_ok(dev)) {
 199                 if (!netif_carrier_ok(vlandev))
 200                         netif_carrier_on(vlandev);
 201         } else {
 202                 if (netif_carrier_ok(vlandev))
 203                         netif_carrier_off(vlandev);
 204         }
 205 }
 206
 207 int vlan_check_real_dev(struct net_device *real_dev, u16 vlan_id)
 208 {
 209         const char *name = real_dev->name;
 210         const struct net_device_ops *ops = real_dev->netdev_ops;
 211
 212         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
 213                 pr_info("8021q: VLANs not supported on %s\n", name);
 214                 return -EOPNOTSUPP;
 215         }
 216
 217         if ((real_dev->features & NETIF_F_HW_VLAN_RX) && !ops->ndo_vlan_rx_register) {
 218                 pr_info("8021q: device %s has buggy VLAN hw accel\n", name);
 219                 return -EOPNOTSUPP;
 220         }
 221
 222         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 223             (!ops->ndo_vlan_rx_add_vid || !ops->ndo_vlan_rx_kill_vid)) {
 224                 pr_info("8021q: Device %s has buggy VLAN hw accel\n", name);
 225                 return -EOPNOTSUPP;
 226         }
 227
 228         if (__find_vlan_dev(real_dev, vlan_id) != NULL)
 229                 return -EEXIST;
 230
 231         return 0;
 232 }
 233
 234 int register_vlan_dev(struct net_device *dev)
 235 {
 236         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 237         struct net_device *real_dev = vlan->real_dev;
 238         const struct net_device_ops *ops = real_dev->netdev_ops;
 239         u16 vlan_id = vlan->vlan_id;
 240         struct vlan_group *grp, *ngrp = NULL;
 241         int err;
 242
 243         grp = __vlan_find_group(real_dev);
 244         if (!grp) {
 245                 ngrp = grp = vlan_group_alloc(real_dev);
 246                 if (!grp)
 247                         return -ENOBUFS;
 248                 err = vlan_gvrp_init_applicant(real_dev);
 249                 if (err < 0)
 250                         goto out_free_group;
 251         }
 252
 253         err = vlan_group_prealloc_vid(grp, vlan_id);
 254         if (err < 0)
 255                 goto out_uninit_applicant;
 256
 257         err = register_netdevice(dev);
 258         if (err < 0)
 259                 goto out_uninit_applicant;
 260
 261         /* Account for reference in struct vlan_dev_info */
 262         dev_hold(real_dev);
 263
 264         vlan_transfer_operstate(real_dev, dev);
 265         linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
 266
 267         /* So, got the sucker initialized, now lets place
 268          * it into our local structure.
 269          */
 270         vlan_group_set_device(grp, vlan_id, dev);
 271         grp->nr_vlans++;
 272
 273         if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX)
 274                 ops->ndo_vlan_rx_register(real_dev, ngrp);
 275         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 276                 ops->ndo_vlan_rx_add_vid(real_dev, vlan_id);
 277
 278         return 0;
 279
 280 out_uninit_applicant:
 281         if (ngrp)
 282                 vlan_gvrp_uninit_applicant(real_dev);
 283 out_free_group:
 284         if (ngrp)
 285                 vlan_group_free(ngrp);
 286         return err;
 287 }
 288
 289 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
 290  *  Returns 0 if the device was created or a negative error code otherwise.
 291  */
 292 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
 293 {
 294         struct net_device *new_dev;
 295         struct net *net = dev_net(real_dev);
 296         struct vlan_net *vn = net_generic(net, vlan_net_id);
 297         char name[IFNAMSIZ];
 298         int err;
 299
 300         if (vlan_id >= VLAN_VID_MASK)
 301                 return -ERANGE;
 302
 303         err = vlan_check_real_dev(real_dev, vlan_id);
 304         if (err < 0)
 305                 return err;
 306
 307         /* Gotta set up the fields for the device. */
 308         switch (vn->name_type) {
 309         case VLAN_NAME_TYPE_RAW_PLUS_VID:
 310                 /* name will look like:  eth1.0005 */
 311                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
 312                 break;
 313         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
 314                 /* Put our vlan.VID in the name.
 315                  * Name will look like:  vlan5
 316                  */
 317                 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
 318                 break;
 319         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
 320                 /* Put our vlan.VID in the name.
 321                  * Name will look like:  eth0.5
 322                  */
 323                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
 324                 break;
 325         case VLAN_NAME_TYPE_PLUS_VID:
 326                 /* Put our vlan.VID in the name.
 327                  * Name will look like:  vlan0005
 328                  */
 329         default:
 330                 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
 331         }
 332
 333         new_dev = alloc_netdev_mq(sizeof(struct vlan_dev_info), name,
 334                                   vlan_setup, real_dev->num_tx_queues);
 335
 336         if (new_dev == NULL)
 337                 return -ENOBUFS;
 338
 339         new_dev->real_num_tx_queues = real_dev->real_num_tx_queues;
 340         dev_net_set(new_dev, net);
 341         /* need 4 bytes for extra VLAN header info,
 342          * hope the underlying device can handle it.
 343          */
 344         new_dev->mtu = real_dev->mtu;
 345
 346         vlan_dev_info(new_dev)->vlan_id = vlan_id;
 347         vlan_dev_info(new_dev)->real_dev = real_dev;
 348         vlan_dev_info(new_dev)->dent = NULL;
 349         vlan_dev_info(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
 350
 351         new_dev->rtnl_link_ops = &vlan_link_ops;
 352         err = register_vlan_dev(new_dev);
 353         if (err < 0)
 354                 goto out_free_newdev;
 355
 356         return 0;
 357
 358 out_free_newdev:
 359         free_netdev(new_dev);
 360         return err;
 361 }
 362
 363 static void vlan_sync_address(struct net_device *dev,
 364                               struct net_device *vlandev)
 365 {
 366         struct vlan_dev_info *vlan = vlan_dev_info(vlandev);
 367
 368         /* May be called without an actual change */
 369         if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
 370                 return;
 371
 372         /* vlan address was different from the old address and is equal to
 373          * the new address */
 374         if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
 375             !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
 376                 dev_unicast_delete(dev, vlandev->dev_addr);
 377
 378         /* vlan address was equal to the old address and is different from
 379          * the new address */
 380         if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
 381             compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
 382                 dev_unicast_add(dev, vlandev->dev_addr);
 383
 384         memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
 385 }
 386
 387 static void vlan_transfer_features(struct net_device *dev,
 388                                    struct net_device *vlandev)
 389 {
 390         unsigned long old_features = vlandev->features;
 391
 392         vlandev->features &= ~dev->vlan_features;
 393         vlandev->features |= dev->features & dev->vlan_features;
 394         vlandev->gso_max_size = dev->gso_max_size;
 395 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 396         vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
 397 #endif
 398
 399         if (old_features != vlandev->features)
 400                 netdev_features_change(vlandev);
 401 }
 402
 403 static void __vlan_device_event(struct net_device *dev, unsigned long event)
 404 {
 405         switch (event) {
 406         case NETDEV_CHANGENAME:
 407                 vlan_proc_rem_dev(dev);
 408                 if (vlan_proc_add_dev(dev) < 0)
 409                         pr_warning("8021q: failed to change proc name for %s\n",
 410                                         dev->name);
 411                 break;
 412         case NETDEV_REGISTER:
 413                 if (vlan_proc_add_dev(dev) < 0)
 414                         pr_warning("8021q: failed to add proc entry for %s\n",
 415                                         dev->name);
 416                 break;
 417         case NETDEV_UNREGISTER:
 418                 vlan_proc_rem_dev(dev);
 419                 break;
 420         }
 421 }
 422
 423 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
 424                              void *ptr)
 425 {
 426         struct net_device *dev = ptr;
 427         struct vlan_group *grp;
 428         int i, flgs;
 429         struct net_device *vlandev;
 430
 431         if (is_vlan_dev(dev))
 432                 __vlan_device_event(dev, event);
 433
 434         grp = __vlan_find_group(dev);
 435         if (!grp)
 436                 goto out;
 437
 438         /* It is OK that we do not hold the group lock right now,
 439          * as we run under the RTNL lock.
 440          */
 441
 442         switch (event) {
 443         case NETDEV_CHANGE:
 444                 /* Propagate real device state to vlan devices */
 445                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 446                         vlandev = vlan_group_get_device(grp, i);
 447                         if (!vlandev)
 448                                 continue;
 449
 450                         vlan_transfer_operstate(dev, vlandev);
 451                 }
 452                 break;
 453
 454         case NETDEV_CHANGEADDR:
 455                 /* Adjust unicast filters on underlying device */
 456                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 457                         vlandev = vlan_group_get_device(grp, i);
 458                         if (!vlandev)
 459                                 continue;
 460
 461                         flgs = vlandev->flags;
 462                         if (!(flgs & IFF_UP))
 463                                 continue;
 464
 465                         vlan_sync_address(dev, vlandev);
 466                 }
 467                 break;
 468
 469         case NETDEV_CHANGEMTU:
 470                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 471                         vlandev = vlan_group_get_device(grp, i);
 472                         if (!vlandev)
 473                                 continue;
 474
 475                         if (vlandev->mtu <= dev->mtu)
 476                                 continue;
 477
 478                         dev_set_mtu(vlandev, dev->mtu);
 479                 }
 480                 break;
 481
 482         case NETDEV_FEAT_CHANGE:
 483                 /* Propagate device features to underlying device */
 484                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 485                         vlandev = vlan_group_get_device(grp, i);
 486                         if (!vlandev)
 487                                 continue;
 488
 489                         vlan_transfer_features(dev, vlandev);
 490                 }
 491
 492                 break;
 493
 494         case NETDEV_DOWN:
 495                 /* Put all VLANs for this dev in the down state too.  */
 496                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 497                         vlandev = vlan_group_get_device(grp, i);
 498                         if (!vlandev)
 499                                 continue;
 500
 501                         flgs = vlandev->flags;
 502                         if (!(flgs & IFF_UP))
 503                                 continue;
 504
 505                         dev_change_flags(vlandev, flgs & ~IFF_UP);
 506                         vlan_transfer_operstate(dev, vlandev);
 507                 }
 508                 break;
 509
 510         case NETDEV_UP:
 511                 /* Put all VLANs for this dev in the up state too.  */
 512                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 513                         vlandev = vlan_group_get_device(grp, i);
 514                         if (!vlandev)
 515                                 continue;
 516
 517                         flgs = vlandev->flags;
 518                         if (flgs & IFF_UP)
 519                                 continue;
 520
 521                         dev_change_flags(vlandev, flgs | IFF_UP);
 522                         vlan_transfer_operstate(dev, vlandev);
 523                 }
 524                 break;
 525
 526         case NETDEV_UNREGISTER:
 527                 /* Delete all VLANs for this dev. */
 528                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 529                         vlandev = vlan_group_get_device(grp, i);
 530                         if (!vlandev)
 531                                 continue;
 532
 533                         /* unregistration of last vlan destroys group, abort
 534                          * afterwards */
 535                         if (grp->nr_vlans == 1)
 536                                 i = VLAN_GROUP_ARRAY_LEN;
 537
 538                         unregister_vlan_dev(vlandev);
 539                 }
 540                 break;
 541         }
 542
 543 out:
 544         return NOTIFY_DONE;
 545 }
 546
 547 static struct notifier_block vlan_notifier_block __read_mostly = {
 548         .notifier_call = vlan_device_event,
 549 };
 550
 551 /*
 552  *      VLAN IOCTL handler.
 553  *      o execute requested action or pass command to the device driver
 554  *   arg is really a struct vlan_ioctl_args __user *.
 555  */
 556 static int vlan_ioctl_handler(struct net *net, void __user *arg)
 557 {
 558         int err;
 559         struct vlan_ioctl_args args;
 560         struct net_device *dev = NULL;
 561
 562         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 563                 return -EFAULT;
 564
 565         /* Null terminate this sucker, just in case. */
 566         args.device1[23] = 0;
 567         args.u.device2[23] = 0;
 568
 569         rtnl_lock();
 570
 571         switch (args.cmd) {
 572         case SET_VLAN_INGRESS_PRIORITY_CMD:
 573         case SET_VLAN_EGRESS_PRIORITY_CMD:
 574         case SET_VLAN_FLAG_CMD:
 575         case ADD_VLAN_CMD:
 576         case DEL_VLAN_CMD:
 577         case GET_VLAN_REALDEV_NAME_CMD:
 578         case GET_VLAN_VID_CMD:
 579                 err = -ENODEV;
 580                 dev = __dev_get_by_name(net, args.device1);
 581                 if (!dev)
 582                         goto out;
 583
 584                 err = -EINVAL;
 585                 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
 586                         goto out;
 587         }
 588
 589         switch (args.cmd) {
 590         case SET_VLAN_INGRESS_PRIORITY_CMD:
 591                 err = -EPERM;
 592                 if (!capable(CAP_NET_ADMIN))
 593                         break;
 594                 vlan_dev_set_ingress_priority(dev,
 595                                               args.u.skb_priority,
 596                                               args.vlan_qos);
 597                 err = 0;
 598                 break;
 599
 600         case SET_VLAN_EGRESS_PRIORITY_CMD:
 601                 err = -EPERM;
 602                 if (!capable(CAP_NET_ADMIN))
 603                         break;
 604                 err = vlan_dev_set_egress_priority(dev,
 605                                                    args.u.skb_priority,
 606                                                    args.vlan_qos);
 607                 break;
 608
 609         case SET_VLAN_FLAG_CMD:
 610                 err = -EPERM;
 611                 if (!capable(CAP_NET_ADMIN))
 612                         break;
 613                 err = vlan_dev_change_flags(dev,
 614                                             args.vlan_qos ? args.u.flag : 0,
 615                                             args.u.flag);
 616                 break;
 617
 618         case SET_VLAN_NAME_TYPE_CMD:
 619                 err = -EPERM;
 620                 if (!capable(CAP_NET_ADMIN))
 621                         break;
 622                 if ((args.u.name_type >= 0) &&
 623                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
 624                         struct vlan_net *vn;
 625
 626                         vn = net_generic(net, vlan_net_id);
 627                         vn->name_type = args.u.name_type;
 628                         err = 0;
 629                 } else {
 630                         err = -EINVAL;
 631                 }
 632                 break;
 633
 634         case ADD_VLAN_CMD:
 635                 err = -EPERM;
 636                 if (!capable(CAP_NET_ADMIN))
 637                         break;
 638                 err = register_vlan_device(dev, args.u.VID);
 639                 break;
 640
 641         case DEL_VLAN_CMD:
 642                 err = -EPERM;
 643                 if (!capable(CAP_NET_ADMIN))
 644                         break;
 645                 unregister_vlan_dev(dev);
 646                 err = 0;
 647                 break;
 648
 649         case GET_VLAN_REALDEV_NAME_CMD:
 650                 err = 0;
 651                 vlan_dev_get_realdev_name(dev, args.u.device2);
 652                 if (copy_to_user(arg, &args,
 653                                  sizeof(struct vlan_ioctl_args)))
 654                         err = -EFAULT;
 655                 break;
 656
 657         case GET_VLAN_VID_CMD:
 658                 err = 0;
 659                 args.u.VID = vlan_dev_vlan_id(dev);
 660                 if (copy_to_user(arg, &args,
 661                                  sizeof(struct vlan_ioctl_args)))
 662                       err = -EFAULT;
 663                 break;
 664
 665         default:
 666                 err = -EOPNOTSUPP;
 667                 break;
 668         }
 669 out:
 670         rtnl_unlock();
 671         return err;
 672 }
 673
 674 static int vlan_init_net(struct net *net)
 675 {
 676         int err;
 677         struct vlan_net *vn;
 678
 679         err = -ENOMEM;
 680         vn = kzalloc(sizeof(struct vlan_net), GFP_KERNEL);
 681         if (vn == NULL)
 682                 goto err_alloc;
 683
 684         err = net_assign_generic(net, vlan_net_id, vn);
 685         if (err < 0)
 686                 goto err_assign;
 687
 688         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
 689
 690         err = vlan_proc_init(net);
 691         if (err < 0)
 692                 goto err_proc;
 693
 694         return 0;
 695
 696 err_proc:
 697         /* nothing */
 698 err_assign:
 699         kfree(vn);
 700 err_alloc:
 701         return err;
 702 }
 703
 704 static void vlan_exit_net(struct net *net)
 705 {
 706         struct vlan_net *vn;
 707
 708         vn = net_generic(net, vlan_net_id);
 709         rtnl_kill_links(net, &vlan_link_ops);
 710         vlan_proc_cleanup(net);
 711         kfree(vn);
 712 }
 713
 714 static struct pernet_operations vlan_net_ops = {
 715         .init = vlan_init_net,
 716         .exit = vlan_exit_net,
 717 };
 718
 719 static int __init vlan_proto_init(void)
 720 {
 721         int err;
 722
 723         pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright);
 724         pr_info("All bugs added by %s\n", vlan_buggyright);
 725
 726         err = register_pernet_gen_device(&vlan_net_id, &vlan_net_ops);
 727         if (err < 0)
 728                 goto err0;
 729
 730         err = register_netdevice_notifier(&vlan_notifier_block);
 731         if (err < 0)
 732                 goto err2;
 733
 734         err = vlan_gvrp_init();
 735         if (err < 0)
 736                 goto err3;
 737
 738         err = vlan_netlink_init();
 739         if (err < 0)
 740                 goto err4;
 741
 742         dev_add_pack(&vlan_packet_type);
 743         vlan_ioctl_set(vlan_ioctl_handler);
 744         return 0;
 745
 746 err4:
 747         vlan_gvrp_uninit();
 748 err3:
 749         unregister_netdevice_notifier(&vlan_notifier_block);
 750 err2:
 751         unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
 752 err0:
 753         return err;
 754 }
 755
 756 static void __exit vlan_cleanup_module(void)
 757 {
 758         unsigned int i;
 759
 760         vlan_ioctl_set(NULL);
 761         vlan_netlink_fini();
 762
 763         unregister_netdevice_notifier(&vlan_notifier_block);
 764
 765         dev_remove_pack(&vlan_packet_type);
 766
 767         /* This table must be empty if there are no module references left. */
 768         for (i = 0; i < VLAN_GRP_HASH_SIZE; i++)
 769                 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
 770
 771         unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
 772         rcu_barrier(); /* Wait for completion of call_rcu()'s */
 773
 774         vlan_gvrp_uninit();
 775 }
 776
 777 module_init(vlan_proto_init);
 778 module_exit(vlan_cleanup_module);
 779
 780 MODULE_LICENSE("GPL");
 781 MODULE_VERSION(DRV_VERSION);