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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 <asm/uaccess.h> /* for copy_from_user */
  22 #include <linux/capability.h>
  23 #include <linux/module.h>
  24 #include <linux/netdevice.h>
  25 #include <linux/skbuff.h>
  26 #include <net/datalink.h>
  27 #include <linux/mm.h>
  28 #include <linux/in.h>
  29 #include <linux/init.h>
  30 #include <net/p8022.h>
  31 #include <net/arp.h>
  32 #include <linux/rtnetlink.h>
  33 #include <linux/notifier.h>
  34 #include <net/net_namespace.h>
  35 #include <net/netns/generic.h>
  36
  37 #include <linux/if_vlan.h>
  38 #include "vlan.h"
  39 #include "vlanproc.h"
  40
  41 #define DRV_VERSION "1.8"
  42
  43 /* Global VLAN variables */
  44
  45 int vlan_net_id;
  46
  47 /* Our listing of VLAN group(s) */
  48 static struct hlist_head vlan_group_hash[VLAN_GRP_HASH_SIZE];
  49
  50 static char vlan_fullname[] = "802.1Q VLAN Support";
  51 static char vlan_version[] = DRV_VERSION;
  52 static char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>";
  53 static char vlan_buggyright[] = "David S. Miller <davem@redhat.com>";
  54
  55 /* Determines interface naming scheme. */
  56 unsigned short vlan_name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
  57
  58 static struct packet_type vlan_packet_type = {
  59         .type = __constant_htons(ETH_P_8021Q),
  60         .func = vlan_skb_recv, /* VLAN receive method */
  61 };
  62
  63 /* End of global variables definitions. */
  64
  65 static inline unsigned int vlan_grp_hashfn(unsigned int idx)
  66 {
  67         return ((idx >> VLAN_GRP_HASH_SHIFT) ^ idx) & VLAN_GRP_HASH_MASK;
  68 }
  69
  70 /* Must be invoked with RCU read lock (no preempt) */
  71 static struct vlan_group *__vlan_find_group(struct net_device *real_dev)
  72 {
  73         struct vlan_group *grp;
  74         struct hlist_node *n;
  75         int hash = vlan_grp_hashfn(real_dev->ifindex);
  76
  77         hlist_for_each_entry_rcu(grp, n, &vlan_group_hash[hash], hlist) {
  78                 if (grp->real_dev == real_dev)
  79                         return grp;
  80         }
  81
  82         return NULL;
  83 }
  84
  85 /*  Find the protocol handler.  Assumes VID < VLAN_VID_MASK.
  86  *
  87  * Must be invoked with RCU read lock (no preempt)
  88  */
  89 struct net_device *__find_vlan_dev(struct net_device *real_dev,
  90                                    unsigned short VID)
  91 {
  92         struct vlan_group *grp = __vlan_find_group(real_dev);
  93
  94         if (grp)
  95                 return vlan_group_get_device(grp, VID);
  96
  97         return NULL;
  98 }
  99
 100 static void vlan_group_free(struct vlan_group *grp)
 101 {
 102         int i;
 103
 104         for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
 105                 kfree(grp->vlan_devices_arrays[i]);
 106         kfree(grp);
 107 }
 108
 109 static struct vlan_group *vlan_group_alloc(struct net_device *real_dev)
 110 {
 111         struct vlan_group *grp;
 112
 113         grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
 114         if (!grp)
 115                 return NULL;
 116
 117         grp->real_dev = real_dev;
 118         hlist_add_head_rcu(&grp->hlist,
 119                         &vlan_group_hash[vlan_grp_hashfn(real_dev->ifindex)]);
 120         return grp;
 121 }
 122
 123 static int vlan_group_prealloc_vid(struct vlan_group *vg, int vid)
 124 {
 125         struct net_device **array;
 126         unsigned int size;
 127
 128         ASSERT_RTNL();
 129
 130         array = vg->vlan_devices_arrays[vid / VLAN_GROUP_ARRAY_PART_LEN];
 131         if (array != NULL)
 132                 return 0;
 133
 134         size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
 135         array = kzalloc(size, GFP_KERNEL);
 136         if (array == NULL)
 137                 return -ENOBUFS;
 138
 139         vg->vlan_devices_arrays[vid / VLAN_GROUP_ARRAY_PART_LEN] = array;
 140         return 0;
 141 }
 142
 143 static void vlan_rcu_free(struct rcu_head *rcu)
 144 {
 145         vlan_group_free(container_of(rcu, struct vlan_group, rcu));
 146 }
 147
 148 void unregister_vlan_dev(struct net_device *dev)
 149 {
 150         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 151         struct net_device *real_dev = vlan->real_dev;
 152         struct vlan_group *grp;
 153         unsigned short vlan_id = vlan->vlan_id;
 154
 155         ASSERT_RTNL();
 156
 157         grp = __vlan_find_group(real_dev);
 158         BUG_ON(!grp);
 159
 160         vlan_proc_rem_dev(dev);
 161
 162         /* Take it out of our own structures, but be sure to interlock with
 163          * HW accelerating devices or SW vlan input packet processing.
 164          */
 165         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 166                 real_dev->vlan_rx_kill_vid(real_dev, vlan_id);
 167
 168         vlan_group_set_device(grp, vlan_id, NULL);
 169         grp->nr_vlans--;
 170
 171         synchronize_net();
 172
 173         /* If the group is now empty, kill off the group. */
 174         if (grp->nr_vlans == 0) {
 175                 if (real_dev->features & NETIF_F_HW_VLAN_RX)
 176                         real_dev->vlan_rx_register(real_dev, NULL);
 177
 178                 hlist_del_rcu(&grp->hlist);
 179
 180                 /* Free the group, after all cpu's are done. */
 181                 call_rcu(&grp->rcu, vlan_rcu_free);
 182         }
 183
 184         /* Get rid of the vlan's reference to real_dev */
 185         dev_put(real_dev);
 186
 187         unregister_netdevice(dev);
 188 }
 189
 190 static void vlan_transfer_operstate(const struct net_device *dev,
 191                                     struct net_device *vlandev)
 192 {
 193         /* Have to respect userspace enforced dormant state
 194          * of real device, also must allow supplicant running
 195          * on VLAN device
 196          */
 197         if (dev->operstate == IF_OPER_DORMANT)
 198                 netif_dormant_on(vlandev);
 199         else
 200                 netif_dormant_off(vlandev);
 201
 202         if (netif_carrier_ok(dev)) {
 203                 if (!netif_carrier_ok(vlandev))
 204                         netif_carrier_on(vlandev);
 205         } else {
 206                 if (netif_carrier_ok(vlandev))
 207                         netif_carrier_off(vlandev);
 208         }
 209 }
 210
 211 int vlan_check_real_dev(struct net_device *real_dev, unsigned short vlan_id)
 212 {
 213         char *name = real_dev->name;
 214
 215         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
 216                 pr_info("8021q: VLANs not supported on %s\n", name);
 217                 return -EOPNOTSUPP;
 218         }
 219
 220         if ((real_dev->features & NETIF_F_HW_VLAN_RX) &&
 221             !real_dev->vlan_rx_register) {
 222                 pr_info("8021q: device %s has buggy VLAN hw accel\n", name);
 223                 return -EOPNOTSUPP;
 224         }
 225
 226         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 227             (!real_dev->vlan_rx_add_vid || !real_dev->vlan_rx_kill_vid)) {
 228                 pr_info("8021q: Device %s has buggy VLAN hw accel\n", name);
 229                 return -EOPNOTSUPP;
 230         }
 231
 232         /* The real device must be up and operating in order to
 233          * assosciate a VLAN device with it.
 234          */
 235         if (!(real_dev->flags & IFF_UP))
 236                 return -ENETDOWN;
 237
 238         if (__find_vlan_dev(real_dev, vlan_id) != NULL)
 239                 return -EEXIST;
 240
 241         return 0;
 242 }
 243
 244 int register_vlan_dev(struct net_device *dev)
 245 {
 246         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 247         struct net_device *real_dev = vlan->real_dev;
 248         unsigned short vlan_id = vlan->vlan_id;
 249         struct vlan_group *grp, *ngrp = NULL;
 250         int err;
 251
 252         grp = __vlan_find_group(real_dev);
 253         if (!grp) {
 254                 ngrp = grp = vlan_group_alloc(real_dev);
 255                 if (!grp)
 256                         return -ENOBUFS;
 257         }
 258
 259         err = vlan_group_prealloc_vid(grp, vlan_id);
 260         if (err < 0)
 261                 goto out_free_group;
 262
 263         err = register_netdevice(dev);
 264         if (err < 0)
 265                 goto out_free_group;
 266
 267         /* Account for reference in struct vlan_dev_info */
 268         dev_hold(real_dev);
 269
 270         vlan_transfer_operstate(real_dev, dev);
 271         linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
 272
 273         /* So, got the sucker initialized, now lets place
 274          * it into our local structure.
 275          */
 276         vlan_group_set_device(grp, vlan_id, dev);
 277         grp->nr_vlans++;
 278
 279         if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX)
 280                 real_dev->vlan_rx_register(real_dev, ngrp);
 281         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 282                 real_dev->vlan_rx_add_vid(real_dev, vlan_id);
 283
 284         if (vlan_proc_add_dev(dev) < 0)
 285                 pr_warning("8021q: failed to add proc entry for %s\n",
 286                            dev->name);
 287         return 0;
 288
 289 out_free_group:
 290         if (ngrp)
 291                 vlan_group_free(ngrp);
 292         return err;
 293 }
 294
 295 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
 296  *  Returns 0 if the device was created or a negative error code otherwise.
 297  */
 298 static int register_vlan_device(struct net_device *real_dev,
 299                                 unsigned short VLAN_ID)
 300 {
 301         struct net_device *new_dev;
 302         char name[IFNAMSIZ];
 303         int err;
 304
 305         if (VLAN_ID >= VLAN_VID_MASK)
 306                 return -ERANGE;
 307
 308         err = vlan_check_real_dev(real_dev, VLAN_ID);
 309         if (err < 0)
 310                 return err;
 311
 312         /* Gotta set up the fields for the device. */
 313         switch (vlan_name_type) {
 314         case VLAN_NAME_TYPE_RAW_PLUS_VID:
 315                 /* name will look like:  eth1.0005 */
 316                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, VLAN_ID);
 317                 break;
 318         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
 319                 /* Put our vlan.VID in the name.
 320                  * Name will look like:  vlan5
 321                  */
 322                 snprintf(name, IFNAMSIZ, "vlan%i", VLAN_ID);
 323                 break;
 324         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
 325                 /* Put our vlan.VID in the name.
 326                  * Name will look like:  eth0.5
 327                  */
 328                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, VLAN_ID);
 329                 break;
 330         case VLAN_NAME_TYPE_PLUS_VID:
 331                 /* Put our vlan.VID in the name.
 332                  * Name will look like:  vlan0005
 333                  */
 334         default:
 335                 snprintf(name, IFNAMSIZ, "vlan%.4i", VLAN_ID);
 336         }
 337
 338         new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
 339                                vlan_setup);
 340
 341         if (new_dev == NULL)
 342                 return -ENOBUFS;
 343
 344         /* need 4 bytes for extra VLAN header info,
 345          * hope the underlying device can handle it.
 346          */
 347         new_dev->mtu = real_dev->mtu;
 348
 349         vlan_dev_info(new_dev)->vlan_id = VLAN_ID; /* 1 through VLAN_VID_MASK */
 350         vlan_dev_info(new_dev)->real_dev = real_dev;
 351         vlan_dev_info(new_dev)->dent = NULL;
 352         vlan_dev_info(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
 353
 354         new_dev->rtnl_link_ops = &vlan_link_ops;
 355         err = register_vlan_dev(new_dev);
 356         if (err < 0)
 357                 goto out_free_newdev;
 358
 359         return 0;
 360
 361 out_free_newdev:
 362         free_netdev(new_dev);
 363         return err;
 364 }
 365
 366 static void vlan_sync_address(struct net_device *dev,
 367                               struct net_device *vlandev)
 368 {
 369         struct vlan_dev_info *vlan = vlan_dev_info(vlandev);
 370
 371         /* May be called without an actual change */
 372         if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
 373                 return;
 374
 375         /* vlan address was different from the old address and is equal to
 376          * the new address */
 377         if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
 378             !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
 379                 dev_unicast_delete(dev, vlandev->dev_addr, ETH_ALEN);
 380
 381         /* vlan address was equal to the old address and is different from
 382          * the new address */
 383         if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
 384             compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
 385                 dev_unicast_add(dev, vlandev->dev_addr, ETH_ALEN);
 386
 387         memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
 388 }
 389
 390 static void __vlan_device_event(struct net_device *dev, unsigned long event)
 391 {
 392         switch (event) {
 393         case NETDEV_CHANGENAME:
 394                 vlan_proc_rem_dev(dev);
 395                 if (vlan_proc_add_dev(dev) < 0)
 396                         pr_warning("8021q: failed to change proc name for %s\n",
 397                                         dev->name);
 398                 break;
 399         }
 400 }
 401
 402 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
 403                              void *ptr)
 404 {
 405         struct net_device *dev = ptr;
 406         struct vlan_group *grp;
 407         int i, flgs;
 408         struct net_device *vlandev;
 409
 410         if (dev_net(dev) != &init_net)
 411                 return NOTIFY_DONE;
 412
 413         if (is_vlan_dev(dev)) {
 414                 __vlan_device_event(dev, event);
 415                 goto out;
 416         }
 417
 418         grp = __vlan_find_group(dev);
 419         if (!grp)
 420                 goto out;
 421
 422         /* It is OK that we do not hold the group lock right now,
 423          * as we run under the RTNL lock.
 424          */
 425
 426         switch (event) {
 427         case NETDEV_CHANGE:
 428                 /* Propagate real device state to vlan devices */
 429                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 430                         vlandev = vlan_group_get_device(grp, i);
 431                         if (!vlandev)
 432                                 continue;
 433
 434                         vlan_transfer_operstate(dev, vlandev);
 435                 }
 436                 break;
 437
 438         case NETDEV_CHANGEADDR:
 439                 /* Adjust unicast filters on underlying device */
 440                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 441                         vlandev = vlan_group_get_device(grp, i);
 442                         if (!vlandev)
 443                                 continue;
 444
 445                         flgs = vlandev->flags;
 446                         if (!(flgs & IFF_UP))
 447                                 continue;
 448
 449                         vlan_sync_address(dev, vlandev);
 450                 }
 451                 break;
 452
 453         case NETDEV_DOWN:
 454                 /* Put all VLANs for this dev in the down state too.  */
 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                         flgs = vlandev->flags;
 461                         if (!(flgs & IFF_UP))
 462                                 continue;
 463
 464                         dev_change_flags(vlandev, flgs & ~IFF_UP);
 465                 }
 466                 break;
 467
 468         case NETDEV_UP:
 469                 /* Put all VLANs for this dev in the up state too.  */
 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                         flgs = vlandev->flags;
 476                         if (flgs & IFF_UP)
 477                                 continue;
 478
 479                         dev_change_flags(vlandev, flgs | IFF_UP);
 480                 }
 481                 break;
 482
 483         case NETDEV_UNREGISTER:
 484                 /* Delete all VLANs for this dev. */
 485                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 486                         vlandev = vlan_group_get_device(grp, i);
 487                         if (!vlandev)
 488                                 continue;
 489
 490                         /* unregistration of last vlan destroys group, abort
 491                          * afterwards */
 492                         if (grp->nr_vlans == 1)
 493                                 i = VLAN_GROUP_ARRAY_LEN;
 494
 495                         unregister_vlan_dev(vlandev);
 496                 }
 497                 break;
 498         }
 499
 500 out:
 501         return NOTIFY_DONE;
 502 }
 503
 504 static struct notifier_block vlan_notifier_block __read_mostly = {
 505         .notifier_call = vlan_device_event,
 506 };
 507
 508 /*
 509  *      VLAN IOCTL handler.
 510  *      o execute requested action or pass command to the device driver
 511  *   arg is really a struct vlan_ioctl_args __user *.
 512  */
 513 static int vlan_ioctl_handler(struct net *net, void __user *arg)
 514 {
 515         int err;
 516         unsigned short vid = 0;
 517         struct vlan_ioctl_args args;
 518         struct net_device *dev = NULL;
 519
 520         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 521                 return -EFAULT;
 522
 523         /* Null terminate this sucker, just in case. */
 524         args.device1[23] = 0;
 525         args.u.device2[23] = 0;
 526
 527         rtnl_lock();
 528
 529         switch (args.cmd) {
 530         case SET_VLAN_INGRESS_PRIORITY_CMD:
 531         case SET_VLAN_EGRESS_PRIORITY_CMD:
 532         case SET_VLAN_FLAG_CMD:
 533         case ADD_VLAN_CMD:
 534         case DEL_VLAN_CMD:
 535         case GET_VLAN_REALDEV_NAME_CMD:
 536         case GET_VLAN_VID_CMD:
 537                 err = -ENODEV;
 538                 dev = __dev_get_by_name(&init_net, args.device1);
 539                 if (!dev)
 540                         goto out;
 541
 542                 err = -EINVAL;
 543                 if (args.cmd != ADD_VLAN_CMD &&
 544                     !(dev->priv_flags & IFF_802_1Q_VLAN))
 545                         goto out;
 546         }
 547
 548         switch (args.cmd) {
 549         case SET_VLAN_INGRESS_PRIORITY_CMD:
 550                 err = -EPERM;
 551                 if (!capable(CAP_NET_ADMIN))
 552                         break;
 553                 vlan_dev_set_ingress_priority(dev,
 554                                               args.u.skb_priority,
 555                                               args.vlan_qos);
 556                 err = 0;
 557                 break;
 558
 559         case SET_VLAN_EGRESS_PRIORITY_CMD:
 560                 err = -EPERM;
 561                 if (!capable(CAP_NET_ADMIN))
 562                         break;
 563                 err = vlan_dev_set_egress_priority(dev,
 564                                                    args.u.skb_priority,
 565                                                    args.vlan_qos);
 566                 break;
 567
 568         case SET_VLAN_FLAG_CMD:
 569                 err = -EPERM;
 570                 if (!capable(CAP_NET_ADMIN))
 571                         break;
 572                 err = vlan_dev_set_vlan_flag(dev,
 573                                              args.u.flag,
 574                                              args.vlan_qos);
 575                 break;
 576
 577         case SET_VLAN_NAME_TYPE_CMD:
 578                 err = -EPERM;
 579                 if (!capable(CAP_NET_ADMIN))
 580                         break;
 581                 if ((args.u.name_type >= 0) &&
 582                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
 583                         vlan_name_type = args.u.name_type;
 584                         err = 0;
 585                 } else {
 586                         err = -EINVAL;
 587                 }
 588                 break;
 589
 590         case ADD_VLAN_CMD:
 591                 err = -EPERM;
 592                 if (!capable(CAP_NET_ADMIN))
 593                         break;
 594                 err = register_vlan_device(dev, args.u.VID);
 595                 break;
 596
 597         case DEL_VLAN_CMD:
 598                 err = -EPERM;
 599                 if (!capable(CAP_NET_ADMIN))
 600                         break;
 601                 unregister_vlan_dev(dev);
 602                 err = 0;
 603                 break;
 604
 605         case GET_VLAN_REALDEV_NAME_CMD:
 606                 err = 0;
 607                 vlan_dev_get_realdev_name(dev, args.u.device2);
 608                 if (copy_to_user(arg, &args,
 609                                  sizeof(struct vlan_ioctl_args)))
 610                         err = -EFAULT;
 611                 break;
 612
 613         case GET_VLAN_VID_CMD:
 614                 err = 0;
 615                 vlan_dev_get_vid(dev, &vid);
 616                 args.u.VID = vid;
 617                 if (copy_to_user(arg, &args,
 618                                  sizeof(struct vlan_ioctl_args)))
 619                       err = -EFAULT;
 620                 break;
 621
 622         default:
 623                 err = -EOPNOTSUPP;
 624                 break;
 625         }
 626 out:
 627         rtnl_unlock();
 628         return err;
 629 }
 630
 631 static int vlan_init_net(struct net *net)
 632 {
 633         int err;
 634         struct vlan_net *vn;
 635
 636         err = -ENOMEM;
 637         vn = kzalloc(sizeof(struct vlan_net), GFP_KERNEL);
 638         if (vn == NULL)
 639                 goto err_alloc;
 640
 641         err = net_assign_generic(net, vlan_net_id, vn);
 642         if (err < 0)
 643                 goto err_assign;
 644
 645         err = vlan_proc_init(net);
 646         if (err < 0)
 647                 goto err_proc;
 648
 649         return 0;
 650
 651 err_proc:
 652         /* nothing */
 653 err_assign:
 654         kfree(vn);
 655 err_alloc:
 656         return err;
 657 }
 658
 659 static void vlan_exit_net(struct net *net)
 660 {
 661         struct vlan_net *vn;
 662
 663         vn = net_generic(net, vlan_net_id);
 664         vlan_proc_cleanup(net);
 665         kfree(vn);
 666 }
 667
 668 static struct pernet_operations vlan_net_ops = {
 669         .init = vlan_init_net,
 670         .exit = vlan_exit_net,
 671 };
 672
 673 static int __init vlan_proto_init(void)
 674 {
 675         int err;
 676
 677         pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright);
 678         pr_info("All bugs added by %s\n", vlan_buggyright);
 679
 680         err = register_pernet_gen_device(&vlan_net_id, &vlan_net_ops);
 681         if (err < 0)
 682                 goto err0;
 683
 684         err = register_netdevice_notifier(&vlan_notifier_block);
 685         if (err < 0)
 686                 goto err2;
 687
 688         err = vlan_netlink_init();
 689         if (err < 0)
 690                 goto err3;
 691
 692         dev_add_pack(&vlan_packet_type);
 693         vlan_ioctl_set(vlan_ioctl_handler);
 694         return 0;
 695
 696 err3:
 697         unregister_netdevice_notifier(&vlan_notifier_block);
 698 err2:
 699         unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
 700 err0:
 701         return err;
 702 }
 703
 704 static void __exit vlan_cleanup_module(void)
 705 {
 706         unsigned int i;
 707
 708         vlan_ioctl_set(NULL);
 709         vlan_netlink_fini();
 710
 711         unregister_netdevice_notifier(&vlan_notifier_block);
 712
 713         dev_remove_pack(&vlan_packet_type);
 714
 715         /* This table must be empty if there are no module references left. */
 716         for (i = 0; i < VLAN_GRP_HASH_SIZE; i++)
 717                 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
 718
 719         unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
 720
 721         synchronize_net();
 722 }
 723
 724 module_init(vlan_proto_init);
 725 module_exit(vlan_cleanup_module);
 726
 727 MODULE_LICENSE("GPL");
 728 MODULE_VERSION(DRV_VERSION);