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/rtnetlink.h>
  27 #include <linux/notifier.h>
  28 #include <net/rtnetlink.h>
  29 #include <net/net_namespace.h>
  30 #include <net/netns/generic.h>
  31 #include <asm/uaccess.h>
  32
  33 #include <linux/if_vlan.h>
  34 #include "vlan.h"
  35 #include "vlanproc.h"
  36
  37 #define DRV_VERSION "1.8"
  38
  39 /* Global VLAN variables */
  40
  41 int vlan_net_id;
  42
  43 /* Our listing of VLAN group(s) */
  44 static struct hlist_head vlan_group_hash[VLAN_GRP_HASH_SIZE];
  45
  46 static char vlan_fullname[] = "802.1Q VLAN Support";
  47 static char vlan_version[] = DRV_VERSION;
  48 static char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>";
  49 static char vlan_buggyright[] = "David S. Miller <davem@redhat.com>";
  50
  51 static struct packet_type vlan_packet_type = {
  52         .type = __constant_htons(ETH_P_8021Q),
  53         .func = vlan_skb_recv, /* VLAN receive method */
  54 };
  55
  56 /* End of global variables definitions. */
  57
  58 static inline unsigned int vlan_grp_hashfn(unsigned int idx)
  59 {
  60         return ((idx >> VLAN_GRP_HASH_SHIFT) ^ idx) & VLAN_GRP_HASH_MASK;
  61 }
  62
  63 /* Must be invoked with RCU read lock (no preempt) */
  64 static struct vlan_group *__vlan_find_group(struct net_device *real_dev)
  65 {
  66         struct vlan_group *grp;
  67         struct hlist_node *n;
  68         int hash = vlan_grp_hashfn(real_dev->ifindex);
  69
  70         hlist_for_each_entry_rcu(grp, n, &vlan_group_hash[hash], hlist) {
  71                 if (grp->real_dev == real_dev)
  72                         return grp;
  73         }
  74
  75         return NULL;
  76 }
  77
  78 /*  Find the protocol handler.  Assumes VID < VLAN_VID_MASK.
  79  *
  80  * Must be invoked with RCU read lock (no preempt)
  81  */
  82 struct net_device *__find_vlan_dev(struct net_device *real_dev, u16 vlan_id)
  83 {
  84         struct vlan_group *grp = __vlan_find_group(real_dev);
  85
  86         if (grp)
  87                 return vlan_group_get_device(grp, vlan_id);
  88
  89         return NULL;
  90 }
  91
  92 static void vlan_group_free(struct vlan_group *grp)
  93 {
  94         int i;
  95
  96         for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
  97                 kfree(grp->vlan_devices_arrays[i]);
  98         kfree(grp);
  99 }
 100
 101 static struct vlan_group *vlan_group_alloc(struct net_device *real_dev)
 102 {
 103         struct vlan_group *grp;
 104
 105         grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
 106         if (!grp)
 107                 return NULL;
 108
 109         grp->real_dev = real_dev;
 110         hlist_add_head_rcu(&grp->hlist,
 111                         &vlan_group_hash[vlan_grp_hashfn(real_dev->ifindex)]);
 112         return grp;
 113 }
 114
 115 static int vlan_group_prealloc_vid(struct vlan_group *vg, u16 vlan_id)
 116 {
 117         struct net_device **array;
 118         unsigned int size;
 119
 120         ASSERT_RTNL();
 121
 122         array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
 123         if (array != NULL)
 124                 return 0;
 125
 126         size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
 127         array = kzalloc(size, GFP_KERNEL);
 128         if (array == NULL)
 129                 return -ENOBUFS;
 130
 131         vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN] = array;
 132         return 0;
 133 }
 134
 135 static void vlan_rcu_free(struct rcu_head *rcu)
 136 {
 137         vlan_group_free(container_of(rcu, struct vlan_group, rcu));
 138 }
 139
 140 void unregister_vlan_dev(struct net_device *dev)
 141 {
 142         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 143         struct net_device *real_dev = vlan->real_dev;
 144         struct vlan_group *grp;
 145         u16 vlan_id = vlan->vlan_id;
 146
 147         ASSERT_RTNL();
 148
 149         grp = __vlan_find_group(real_dev);
 150         BUG_ON(!grp);
 151
 152         /* Take it out of our own structures, but be sure to interlock with
 153          * HW accelerating devices or SW vlan input packet processing.
 154          */
 155         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 156                 real_dev->vlan_rx_kill_vid(real_dev, vlan_id);
 157
 158         vlan_group_set_device(grp, vlan_id, NULL);
 159         grp->nr_vlans--;
 160
 161         synchronize_net();
 162
 163         unregister_netdevice(dev);
 164
 165         /* If the group is now empty, kill off the group. */
 166         if (grp->nr_vlans == 0) {
 167                 vlan_gvrp_uninit_applicant(real_dev);
 168
 169                 if (real_dev->features & NETIF_F_HW_VLAN_RX)
 170                         real_dev->vlan_rx_register(real_dev, NULL);
 171
 172                 hlist_del_rcu(&grp->hlist);
 173
 174                 /* Free the group, after all cpu's are done. */
 175                 call_rcu(&grp->rcu, vlan_rcu_free);
 176         }
 177
 178         /* Get rid of the vlan's reference to real_dev */
 179         dev_put(real_dev);
 180 }
 181
 182 static void vlan_transfer_operstate(const struct net_device *dev,
 183                                     struct net_device *vlandev)
 184 {
 185         /* Have to respect userspace enforced dormant state
 186          * of real device, also must allow supplicant running
 187          * on VLAN device
 188          */
 189         if (dev->operstate == IF_OPER_DORMANT)
 190                 netif_dormant_on(vlandev);
 191         else
 192                 netif_dormant_off(vlandev);
 193
 194         if (netif_carrier_ok(dev)) {
 195                 if (!netif_carrier_ok(vlandev))
 196                         netif_carrier_on(vlandev);
 197         } else {
 198                 if (netif_carrier_ok(vlandev))
 199                         netif_carrier_off(vlandev);
 200         }
 201 }
 202
 203 int vlan_check_real_dev(struct net_device *real_dev, u16 vlan_id)
 204 {
 205         char *name = real_dev->name;
 206
 207         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
 208                 pr_info("8021q: VLANs not supported on %s\n", name);
 209                 return -EOPNOTSUPP;
 210         }
 211
 212         if ((real_dev->features & NETIF_F_HW_VLAN_RX) &&
 213             !real_dev->vlan_rx_register) {
 214                 pr_info("8021q: device %s has buggy VLAN hw accel\n", name);
 215                 return -EOPNOTSUPP;
 216         }
 217
 218         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 219             (!real_dev->vlan_rx_add_vid || !real_dev->vlan_rx_kill_vid)) {
 220                 pr_info("8021q: Device %s has buggy VLAN hw accel\n", name);
 221                 return -EOPNOTSUPP;
 222         }
 223
 224         /* The real device must be up and operating in order to
 225          * assosciate a VLAN device with it.
 226          */
 227         if (!(real_dev->flags & IFF_UP))
 228                 return -ENETDOWN;
 229
 230         if (__find_vlan_dev(real_dev, vlan_id) != NULL)
 231                 return -EEXIST;
 232
 233         return 0;
 234 }
 235
 236 int register_vlan_dev(struct net_device *dev)
 237 {
 238         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 239         struct net_device *real_dev = vlan->real_dev;
 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                 real_dev->vlan_rx_register(real_dev, ngrp);
 276         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 277                 real_dev->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(sizeof(struct vlan_dev_info), name,
 335                                vlan_setup);
 336
 337         if (new_dev == NULL)
 338                 return -ENOBUFS;
 339
 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, ETH_ALEN);
 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, ETH_ALEN);
 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
 395         if (old_features != vlandev->features)
 396                 netdev_features_change(vlandev);
 397 }
 398
 399 static void __vlan_device_event(struct net_device *dev, unsigned long event)
 400 {
 401         switch (event) {
 402         case NETDEV_CHANGENAME:
 403                 vlan_proc_rem_dev(dev);
 404                 if (vlan_proc_add_dev(dev) < 0)
 405                         pr_warning("8021q: failed to change proc name for %s\n",
 406                                         dev->name);
 407                 break;
 408         case NETDEV_REGISTER:
 409                 if (vlan_proc_add_dev(dev) < 0)
 410                         pr_warning("8021q: failed to add proc entry for %s\n",
 411                                         dev->name);
 412                 break;
 413         case NETDEV_UNREGISTER:
 414                 vlan_proc_rem_dev(dev);
 415                 break;
 416         }
 417 }
 418
 419 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
 420                              void *ptr)
 421 {
 422         struct net_device *dev = ptr;
 423         struct vlan_group *grp;
 424         int i, flgs;
 425         struct net_device *vlandev;
 426
 427         if (is_vlan_dev(dev))
 428                 __vlan_device_event(dev, event);
 429
 430         grp = __vlan_find_group(dev);
 431         if (!grp)
 432                 goto out;
 433
 434         /* It is OK that we do not hold the group lock right now,
 435          * as we run under the RTNL lock.
 436          */
 437
 438         switch (event) {
 439         case NETDEV_CHANGE:
 440                 /* Propagate real device state to vlan devices */
 441                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 442                         vlandev = vlan_group_get_device(grp, i);
 443                         if (!vlandev)
 444                                 continue;
 445
 446                         vlan_transfer_operstate(dev, vlandev);
 447                 }
 448                 break;
 449
 450         case NETDEV_CHANGEADDR:
 451                 /* Adjust unicast filters on underlying device */
 452                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 453                         vlandev = vlan_group_get_device(grp, i);
 454                         if (!vlandev)
 455                                 continue;
 456
 457                         flgs = vlandev->flags;
 458                         if (!(flgs & IFF_UP))
 459                                 continue;
 460
 461                         vlan_sync_address(dev, vlandev);
 462                 }
 463                 break;
 464
 465         case NETDEV_FEAT_CHANGE:
 466                 /* Propagate device features to underlying device */
 467                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 468                         vlandev = vlan_group_get_device(grp, i);
 469                         if (!vlandev)
 470                                 continue;
 471
 472                         vlan_transfer_features(dev, vlandev);
 473                 }
 474
 475                 break;
 476
 477         case NETDEV_DOWN:
 478                 /* Put all VLANs for this dev in the down state too.  */
 479                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 480                         vlandev = vlan_group_get_device(grp, i);
 481                         if (!vlandev)
 482                                 continue;
 483
 484                         flgs = vlandev->flags;
 485                         if (!(flgs & IFF_UP))
 486                                 continue;
 487
 488                         dev_change_flags(vlandev, flgs & ~IFF_UP);
 489                 }
 490                 break;
 491
 492         case NETDEV_UP:
 493                 /* Put all VLANs for this dev in the up state too.  */
 494                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 495                         vlandev = vlan_group_get_device(grp, i);
 496                         if (!vlandev)
 497                                 continue;
 498
 499                         flgs = vlandev->flags;
 500                         if (flgs & IFF_UP)
 501                                 continue;
 502
 503                         dev_change_flags(vlandev, flgs | IFF_UP);
 504                 }
 505                 break;
 506
 507         case NETDEV_UNREGISTER:
 508                 /* Delete all VLANs for this dev. */
 509                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 510                         vlandev = vlan_group_get_device(grp, i);
 511                         if (!vlandev)
 512                                 continue;
 513
 514                         /* unregistration of last vlan destroys group, abort
 515                          * afterwards */
 516                         if (grp->nr_vlans == 1)
 517                                 i = VLAN_GROUP_ARRAY_LEN;
 518
 519                         unregister_vlan_dev(vlandev);
 520                 }
 521                 break;
 522         }
 523
 524 out:
 525         return NOTIFY_DONE;
 526 }
 527
 528 static struct notifier_block vlan_notifier_block __read_mostly = {
 529         .notifier_call = vlan_device_event,
 530 };
 531
 532 /*
 533  *      VLAN IOCTL handler.
 534  *      o execute requested action or pass command to the device driver
 535  *   arg is really a struct vlan_ioctl_args __user *.
 536  */
 537 static int vlan_ioctl_handler(struct net *net, void __user *arg)
 538 {
 539         int err;
 540         struct vlan_ioctl_args args;
 541         struct net_device *dev = NULL;
 542
 543         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 544                 return -EFAULT;
 545
 546         /* Null terminate this sucker, just in case. */
 547         args.device1[23] = 0;
 548         args.u.device2[23] = 0;
 549
 550         rtnl_lock();
 551
 552         switch (args.cmd) {
 553         case SET_VLAN_INGRESS_PRIORITY_CMD:
 554         case SET_VLAN_EGRESS_PRIORITY_CMD:
 555         case SET_VLAN_FLAG_CMD:
 556         case ADD_VLAN_CMD:
 557         case DEL_VLAN_CMD:
 558         case GET_VLAN_REALDEV_NAME_CMD:
 559         case GET_VLAN_VID_CMD:
 560                 err = -ENODEV;
 561                 dev = __dev_get_by_name(net, args.device1);
 562                 if (!dev)
 563                         goto out;
 564
 565                 err = -EINVAL;
 566                 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
 567                         goto out;
 568         }
 569
 570         switch (args.cmd) {
 571         case SET_VLAN_INGRESS_PRIORITY_CMD:
 572                 err = -EPERM;
 573                 if (!capable(CAP_NET_ADMIN))
 574                         break;
 575                 vlan_dev_set_ingress_priority(dev,
 576                                               args.u.skb_priority,
 577                                               args.vlan_qos);
 578                 err = 0;
 579                 break;
 580
 581         case SET_VLAN_EGRESS_PRIORITY_CMD:
 582                 err = -EPERM;
 583                 if (!capable(CAP_NET_ADMIN))
 584                         break;
 585                 err = vlan_dev_set_egress_priority(dev,
 586                                                    args.u.skb_priority,
 587                                                    args.vlan_qos);
 588                 break;
 589
 590         case SET_VLAN_FLAG_CMD:
 591                 err = -EPERM;
 592                 if (!capable(CAP_NET_ADMIN))
 593                         break;
 594                 err = vlan_dev_change_flags(dev,
 595                                             args.vlan_qos ? args.u.flag : 0,
 596                                             args.u.flag);
 597                 break;
 598
 599         case SET_VLAN_NAME_TYPE_CMD:
 600                 err = -EPERM;
 601                 if (!capable(CAP_NET_ADMIN))
 602                         break;
 603                 if ((args.u.name_type >= 0) &&
 604                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
 605                         struct vlan_net *vn;
 606
 607                         vn = net_generic(net, vlan_net_id);
 608                         vn->name_type = args.u.name_type;
 609                         err = 0;
 610                 } else {
 611                         err = -EINVAL;
 612                 }
 613                 break;
 614
 615         case ADD_VLAN_CMD:
 616                 err = -EPERM;
 617                 if (!capable(CAP_NET_ADMIN))
 618                         break;
 619                 err = register_vlan_device(dev, args.u.VID);
 620                 break;
 621
 622         case DEL_VLAN_CMD:
 623                 err = -EPERM;
 624                 if (!capable(CAP_NET_ADMIN))
 625                         break;
 626                 unregister_vlan_dev(dev);
 627                 err = 0;
 628                 break;
 629
 630         case GET_VLAN_REALDEV_NAME_CMD:
 631                 err = 0;
 632                 vlan_dev_get_realdev_name(dev, args.u.device2);
 633                 if (copy_to_user(arg, &args,
 634                                  sizeof(struct vlan_ioctl_args)))
 635                         err = -EFAULT;
 636                 break;
 637
 638         case GET_VLAN_VID_CMD:
 639                 err = 0;
 640                 args.u.VID = vlan_dev_vlan_id(dev);
 641                 if (copy_to_user(arg, &args,
 642                                  sizeof(struct vlan_ioctl_args)))
 643                       err = -EFAULT;
 644                 break;
 645
 646         default:
 647                 err = -EOPNOTSUPP;
 648                 break;
 649         }
 650 out:
 651         rtnl_unlock();
 652         return err;
 653 }
 654
 655 static int vlan_init_net(struct net *net)
 656 {
 657         int err;
 658         struct vlan_net *vn;
 659
 660         err = -ENOMEM;
 661         vn = kzalloc(sizeof(struct vlan_net), GFP_KERNEL);
 662         if (vn == NULL)
 663                 goto err_alloc;
 664
 665         err = net_assign_generic(net, vlan_net_id, vn);
 666         if (err < 0)
 667                 goto err_assign;
 668
 669         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
 670
 671         err = vlan_proc_init(net);
 672         if (err < 0)
 673                 goto err_proc;
 674
 675         return 0;
 676
 677 err_proc:
 678         /* nothing */
 679 err_assign:
 680         kfree(vn);
 681 err_alloc:
 682         return err;
 683 }
 684
 685 static void vlan_exit_net(struct net *net)
 686 {
 687         struct vlan_net *vn;
 688
 689         vn = net_generic(net, vlan_net_id);
 690         rtnl_kill_links(net, &vlan_link_ops);
 691         vlan_proc_cleanup(net);
 692         kfree(vn);
 693 }
 694
 695 static struct pernet_operations vlan_net_ops = {
 696         .init = vlan_init_net,
 697         .exit = vlan_exit_net,
 698 };
 699
 700 static int __init vlan_proto_init(void)
 701 {
 702         int err;
 703
 704         pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright);
 705         pr_info("All bugs added by %s\n", vlan_buggyright);
 706
 707         err = register_pernet_gen_device(&vlan_net_id, &vlan_net_ops);
 708         if (err < 0)
 709                 goto err0;
 710
 711         err = register_netdevice_notifier(&vlan_notifier_block);
 712         if (err < 0)
 713                 goto err2;
 714
 715         err = vlan_gvrp_init();
 716         if (err < 0)
 717                 goto err3;
 718
 719         err = vlan_netlink_init();
 720         if (err < 0)
 721                 goto err4;
 722
 723         dev_add_pack(&vlan_packet_type);
 724         vlan_ioctl_set(vlan_ioctl_handler);
 725         return 0;
 726
 727 err4:
 728         vlan_gvrp_uninit();
 729 err3:
 730         unregister_netdevice_notifier(&vlan_notifier_block);
 731 err2:
 732         unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
 733 err0:
 734         return err;
 735 }
 736
 737 static void __exit vlan_cleanup_module(void)
 738 {
 739         unsigned int i;
 740
 741         vlan_ioctl_set(NULL);
 742         vlan_netlink_fini();
 743
 744         unregister_netdevice_notifier(&vlan_notifier_block);
 745
 746         dev_remove_pack(&vlan_packet_type);
 747
 748         /* This table must be empty if there are no module references left. */
 749         for (i = 0; i < VLAN_GRP_HASH_SIZE; i++)
 750                 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
 751
 752         unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
 753         synchronize_net();
 754
 755         vlan_gvrp_uninit();
 756 }
 757
 758 module_init(vlan_proto_init);
 759 module_exit(vlan_cleanup_module);
 760
 761 MODULE_LICENSE("GPL");
 762 MODULE_VERSION(DRV_VERSION);