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 static char vlan_fullname[] = "802.1Q VLAN Support";
  50 static char vlan_version[] = DRV_VERSION;
  51 static char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>";
  52 static char vlan_buggyright[] = "David S. Miller <davem@redhat.com>";
  53
  54 static struct packet_type vlan_packet_type = {
  55         .type = __constant_htons(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         struct vlan_group *grp;
 148         u16 vlan_id = vlan->vlan_id;
 149
 150         ASSERT_RTNL();
 151
 152         grp = __vlan_find_group(real_dev);
 153         BUG_ON(!grp);
 154
 155         /* Take it out of our own structures, but be sure to interlock with
 156          * HW accelerating devices or SW vlan input packet processing.
 157          */
 158         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 159                 real_dev->vlan_rx_kill_vid(real_dev, vlan_id);
 160
 161         vlan_group_set_device(grp, vlan_id, NULL);
 162         grp->nr_vlans--;
 163
 164         synchronize_net();
 165
 166         unregister_netdevice(dev);
 167
 168         /* If the group is now empty, kill off the group. */
 169         if (grp->nr_vlans == 0) {
 170                 vlan_gvrp_uninit_applicant(real_dev);
 171
 172                 if (real_dev->features & NETIF_F_HW_VLAN_RX)
 173                         real_dev->vlan_rx_register(real_dev, NULL);
 174
 175                 hlist_del_rcu(&grp->hlist);
 176
 177                 /* Free the group, after all cpu's are done. */
 178                 call_rcu(&grp->rcu, vlan_rcu_free);
 179         }
 180
 181         /* Get rid of the vlan's reference to real_dev */
 182         dev_put(real_dev);
 183 }
 184
 185 static void vlan_transfer_operstate(const struct net_device *dev,
 186                                     struct net_device *vlandev)
 187 {
 188         /* Have to respect userspace enforced dormant state
 189          * of real device, also must allow supplicant running
 190          * on VLAN device
 191          */
 192         if (dev->operstate == IF_OPER_DORMANT)
 193                 netif_dormant_on(vlandev);
 194         else
 195                 netif_dormant_off(vlandev);
 196
 197         if (netif_carrier_ok(dev)) {
 198                 if (!netif_carrier_ok(vlandev))
 199                         netif_carrier_on(vlandev);
 200         } else {
 201                 if (netif_carrier_ok(vlandev))
 202                         netif_carrier_off(vlandev);
 203         }
 204 }
 205
 206 int vlan_check_real_dev(struct net_device *real_dev, u16 vlan_id)
 207 {
 208         char *name = real_dev->name;
 209
 210         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
 211                 pr_info("8021q: VLANs not supported on %s\n", name);
 212                 return -EOPNOTSUPP;
 213         }
 214
 215         if ((real_dev->features & NETIF_F_HW_VLAN_RX) &&
 216             !real_dev->vlan_rx_register) {
 217                 pr_info("8021q: device %s has buggy VLAN hw accel\n", name);
 218                 return -EOPNOTSUPP;
 219         }
 220
 221         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 222             (!real_dev->vlan_rx_add_vid || !real_dev->vlan_rx_kill_vid)) {
 223                 pr_info("8021q: Device %s has buggy VLAN hw accel\n", name);
 224                 return -EOPNOTSUPP;
 225         }
 226
 227         /* The real device must be up and operating in order to
 228          * assosciate a VLAN device with it.
 229          */
 230         if (!(real_dev->flags & IFF_UP))
 231                 return -ENETDOWN;
 232
 233         if (__find_vlan_dev(real_dev, vlan_id) != NULL)
 234                 return -EEXIST;
 235
 236         return 0;
 237 }
 238
 239 int register_vlan_dev(struct net_device *dev)
 240 {
 241         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 242         struct net_device *real_dev = vlan->real_dev;
 243         u16 vlan_id = vlan->vlan_id;
 244         struct vlan_group *grp, *ngrp = NULL;
 245         int err;
 246
 247         grp = __vlan_find_group(real_dev);
 248         if (!grp) {
 249                 ngrp = grp = vlan_group_alloc(real_dev);
 250                 if (!grp)
 251                         return -ENOBUFS;
 252                 err = vlan_gvrp_init_applicant(real_dev);
 253                 if (err < 0)
 254                         goto out_free_group;
 255         }
 256
 257         err = vlan_group_prealloc_vid(grp, vlan_id);
 258         if (err < 0)
 259                 goto out_uninit_applicant;
 260
 261         err = register_netdevice(dev);
 262         if (err < 0)
 263                 goto out_uninit_applicant;
 264
 265         /* Account for reference in struct vlan_dev_info */
 266         dev_hold(real_dev);
 267
 268         vlan_transfer_operstate(real_dev, dev);
 269         linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
 270
 271         /* So, got the sucker initialized, now lets place
 272          * it into our local structure.
 273          */
 274         vlan_group_set_device(grp, vlan_id, dev);
 275         grp->nr_vlans++;
 276
 277         if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX)
 278                 real_dev->vlan_rx_register(real_dev, ngrp);
 279         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 280                 real_dev->vlan_rx_add_vid(real_dev, vlan_id);
 281
 282         return 0;
 283
 284 out_uninit_applicant:
 285         if (ngrp)
 286                 vlan_gvrp_uninit_applicant(real_dev);
 287 out_free_group:
 288         if (ngrp)
 289                 vlan_group_free(ngrp);
 290         return err;
 291 }
 292
 293 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
 294  *  Returns 0 if the device was created or a negative error code otherwise.
 295  */
 296 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
 297 {
 298         struct net_device *new_dev;
 299         struct net *net = dev_net(real_dev);
 300         struct vlan_net *vn = net_generic(net, vlan_net_id);
 301         char name[IFNAMSIZ];
 302         int err;
 303
 304         if (vlan_id >= VLAN_VID_MASK)
 305                 return -ERANGE;
 306
 307         err = vlan_check_real_dev(real_dev, vlan_id);
 308         if (err < 0)
 309                 return err;
 310
 311         /* Gotta set up the fields for the device. */
 312         switch (vn->name_type) {
 313         case VLAN_NAME_TYPE_RAW_PLUS_VID:
 314                 /* name will look like:  eth1.0005 */
 315                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
 316                 break;
 317         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
 318                 /* Put our vlan.VID in the name.
 319                  * Name will look like:  vlan5
 320                  */
 321                 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
 322                 break;
 323         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
 324                 /* Put our vlan.VID in the name.
 325                  * Name will look like:  eth0.5
 326                  */
 327                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
 328                 break;
 329         case VLAN_NAME_TYPE_PLUS_VID:
 330                 /* Put our vlan.VID in the name.
 331                  * Name will look like:  vlan0005
 332                  */
 333         default:
 334                 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
 335         }
 336
 337         new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
 338                                vlan_setup);
 339
 340         if (new_dev == NULL)
 341                 return -ENOBUFS;
 342
 343         dev_net_set(new_dev, net);
 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;
 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_transfer_features(struct net_device *dev,
 391                                    struct net_device *vlandev)
 392 {
 393         unsigned long old_features = vlandev->features;
 394
 395         vlandev->features &= ~dev->vlan_features;
 396         vlandev->features |= dev->features & dev->vlan_features;
 397
 398         if (old_features != vlandev->features)
 399                 netdev_features_change(vlandev);
 400 }
 401
 402 static void __vlan_device_event(struct net_device *dev, unsigned long event)
 403 {
 404         switch (event) {
 405         case NETDEV_CHANGENAME:
 406                 vlan_proc_rem_dev(dev);
 407                 if (vlan_proc_add_dev(dev) < 0)
 408                         pr_warning("8021q: failed to change proc name for %s\n",
 409                                         dev->name);
 410                 break;
 411         case NETDEV_REGISTER:
 412                 if (vlan_proc_add_dev(dev) < 0)
 413                         pr_warning("8021q: failed to add proc entry for %s\n",
 414                                         dev->name);
 415                 break;
 416         case NETDEV_UNREGISTER:
 417                 vlan_proc_rem_dev(dev);
 418                 break;
 419         }
 420 }
 421
 422 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
 423                              void *ptr)
 424 {
 425         struct net_device *dev = ptr;
 426         struct vlan_group *grp;
 427         int i, flgs;
 428         struct net_device *vlandev;
 429
 430         if (is_vlan_dev(dev))
 431                 __vlan_device_event(dev, event);
 432
 433         grp = __vlan_find_group(dev);
 434         if (!grp)
 435                 goto out;
 436
 437         /* It is OK that we do not hold the group lock right now,
 438          * as we run under the RTNL lock.
 439          */
 440
 441         switch (event) {
 442         case NETDEV_CHANGE:
 443                 /* Propagate real device state to vlan devices */
 444                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 445                         vlandev = vlan_group_get_device(grp, i);
 446                         if (!vlandev)
 447                                 continue;
 448
 449                         vlan_transfer_operstate(dev, vlandev);
 450                 }
 451                 break;
 452
 453         case NETDEV_CHANGEADDR:
 454                 /* Adjust unicast filters on underlying device */
 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                         vlan_sync_address(dev, vlandev);
 465                 }
 466                 break;
 467
 468         case NETDEV_FEAT_CHANGE:
 469                 /* Propagate device features to underlying device */
 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                         vlan_transfer_features(dev, vlandev);
 476                 }
 477
 478                 break;
 479
 480         case NETDEV_DOWN:
 481                 /* Put all VLANs for this dev in the down state too.  */
 482                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 483                         vlandev = vlan_group_get_device(grp, i);
 484                         if (!vlandev)
 485                                 continue;
 486
 487                         flgs = vlandev->flags;
 488                         if (!(flgs & IFF_UP))
 489                                 continue;
 490
 491                         dev_change_flags(vlandev, flgs & ~IFF_UP);
 492                 }
 493                 break;
 494
 495         case NETDEV_UP:
 496                 /* Put all VLANs for this dev in the up state too.  */
 497                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 498                         vlandev = vlan_group_get_device(grp, i);
 499                         if (!vlandev)
 500                                 continue;
 501
 502                         flgs = vlandev->flags;
 503                         if (flgs & IFF_UP)
 504                                 continue;
 505
 506                         dev_change_flags(vlandev, flgs | IFF_UP);
 507                 }
 508                 break;
 509
 510         case NETDEV_UNREGISTER:
 511                 /* Delete all VLANs for this dev. */
 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                         /* unregistration of last vlan destroys group, abort
 518                          * afterwards */
 519                         if (grp->nr_vlans == 1)
 520                                 i = VLAN_GROUP_ARRAY_LEN;
 521
 522                         unregister_vlan_dev(vlandev);
 523                 }
 524                 break;
 525         }
 526
 527 out:
 528         return NOTIFY_DONE;
 529 }
 530
 531 static struct notifier_block vlan_notifier_block __read_mostly = {
 532         .notifier_call = vlan_device_event,
 533 };
 534
 535 /*
 536  *      VLAN IOCTL handler.
 537  *      o execute requested action or pass command to the device driver
 538  *   arg is really a struct vlan_ioctl_args __user *.
 539  */
 540 static int vlan_ioctl_handler(struct net *net, void __user *arg)
 541 {
 542         int err;
 543         struct vlan_ioctl_args args;
 544         struct net_device *dev = NULL;
 545
 546         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 547                 return -EFAULT;
 548
 549         /* Null terminate this sucker, just in case. */
 550         args.device1[23] = 0;
 551         args.u.device2[23] = 0;
 552
 553         rtnl_lock();
 554
 555         switch (args.cmd) {
 556         case SET_VLAN_INGRESS_PRIORITY_CMD:
 557         case SET_VLAN_EGRESS_PRIORITY_CMD:
 558         case SET_VLAN_FLAG_CMD:
 559         case ADD_VLAN_CMD:
 560         case DEL_VLAN_CMD:
 561         case GET_VLAN_REALDEV_NAME_CMD:
 562         case GET_VLAN_VID_CMD:
 563                 err = -ENODEV;
 564                 dev = __dev_get_by_name(net, args.device1);
 565                 if (!dev)
 566                         goto out;
 567
 568                 err = -EINVAL;
 569                 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
 570                         goto out;
 571         }
 572
 573         switch (args.cmd) {
 574         case SET_VLAN_INGRESS_PRIORITY_CMD:
 575                 err = -EPERM;
 576                 if (!capable(CAP_NET_ADMIN))
 577                         break;
 578                 vlan_dev_set_ingress_priority(dev,
 579                                               args.u.skb_priority,
 580                                               args.vlan_qos);
 581                 err = 0;
 582                 break;
 583
 584         case SET_VLAN_EGRESS_PRIORITY_CMD:
 585                 err = -EPERM;
 586                 if (!capable(CAP_NET_ADMIN))
 587                         break;
 588                 err = vlan_dev_set_egress_priority(dev,
 589                                                    args.u.skb_priority,
 590                                                    args.vlan_qos);
 591                 break;
 592
 593         case SET_VLAN_FLAG_CMD:
 594                 err = -EPERM;
 595                 if (!capable(CAP_NET_ADMIN))
 596                         break;
 597                 err = vlan_dev_change_flags(dev,
 598                                             args.vlan_qos ? args.u.flag : 0,
 599                                             args.u.flag);
 600                 break;
 601
 602         case SET_VLAN_NAME_TYPE_CMD:
 603                 err = -EPERM;
 604                 if (!capable(CAP_NET_ADMIN))
 605                         break;
 606                 if ((args.u.name_type >= 0) &&
 607                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
 608                         struct vlan_net *vn;
 609
 610                         vn = net_generic(net, vlan_net_id);
 611                         vn->name_type = args.u.name_type;
 612                         err = 0;
 613                 } else {
 614                         err = -EINVAL;
 615                 }
 616                 break;
 617
 618         case ADD_VLAN_CMD:
 619                 err = -EPERM;
 620                 if (!capable(CAP_NET_ADMIN))
 621                         break;
 622                 err = register_vlan_device(dev, args.u.VID);
 623                 break;
 624
 625         case DEL_VLAN_CMD:
 626                 err = -EPERM;
 627                 if (!capable(CAP_NET_ADMIN))
 628                         break;
 629                 unregister_vlan_dev(dev);
 630                 err = 0;
 631                 break;
 632
 633         case GET_VLAN_REALDEV_NAME_CMD:
 634                 err = 0;
 635                 vlan_dev_get_realdev_name(dev, args.u.device2);
 636                 if (copy_to_user(arg, &args,
 637                                  sizeof(struct vlan_ioctl_args)))
 638                         err = -EFAULT;
 639                 break;
 640
 641         case GET_VLAN_VID_CMD:
 642                 err = 0;
 643                 args.u.VID = vlan_dev_vlan_id(dev);
 644                 if (copy_to_user(arg, &args,
 645                                  sizeof(struct vlan_ioctl_args)))
 646                       err = -EFAULT;
 647                 break;
 648
 649         default:
 650                 err = -EOPNOTSUPP;
 651                 break;
 652         }
 653 out:
 654         rtnl_unlock();
 655         return err;
 656 }
 657
 658 static int vlan_init_net(struct net *net)
 659 {
 660         int err;
 661         struct vlan_net *vn;
 662
 663         err = -ENOMEM;
 664         vn = kzalloc(sizeof(struct vlan_net), GFP_KERNEL);
 665         if (vn == NULL)
 666                 goto err_alloc;
 667
 668         err = net_assign_generic(net, vlan_net_id, vn);
 669         if (err < 0)
 670                 goto err_assign;
 671
 672         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
 673
 674         err = vlan_proc_init(net);
 675         if (err < 0)
 676                 goto err_proc;
 677
 678         return 0;
 679
 680 err_proc:
 681         /* nothing */
 682 err_assign:
 683         kfree(vn);
 684 err_alloc:
 685         return err;
 686 }
 687
 688 static void vlan_exit_net(struct net *net)
 689 {
 690         struct vlan_net *vn;
 691
 692         vn = net_generic(net, vlan_net_id);
 693         rtnl_kill_links(net, &vlan_link_ops);
 694         vlan_proc_cleanup(net);
 695         kfree(vn);
 696 }
 697
 698 static struct pernet_operations vlan_net_ops = {
 699         .init = vlan_init_net,
 700         .exit = vlan_exit_net,
 701 };
 702
 703 static int __init vlan_proto_init(void)
 704 {
 705         int err;
 706
 707         pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright);
 708         pr_info("All bugs added by %s\n", vlan_buggyright);
 709
 710         err = register_pernet_gen_device(&vlan_net_id, &vlan_net_ops);
 711         if (err < 0)
 712                 goto err0;
 713
 714         err = register_netdevice_notifier(&vlan_notifier_block);
 715         if (err < 0)
 716                 goto err2;
 717
 718         err = vlan_gvrp_init();
 719         if (err < 0)
 720                 goto err3;
 721
 722         err = vlan_netlink_init();
 723         if (err < 0)
 724                 goto err4;
 725
 726         dev_add_pack(&vlan_packet_type);
 727         vlan_ioctl_set(vlan_ioctl_handler);
 728         return 0;
 729
 730 err4:
 731         vlan_gvrp_uninit();
 732 err3:
 733         unregister_netdevice_notifier(&vlan_notifier_block);
 734 err2:
 735         unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
 736 err0:
 737         return err;
 738 }
 739
 740 static void __exit vlan_cleanup_module(void)
 741 {
 742         unsigned int i;
 743
 744         vlan_ioctl_set(NULL);
 745         vlan_netlink_fini();
 746
 747         unregister_netdevice_notifier(&vlan_notifier_block);
 748
 749         dev_remove_pack(&vlan_packet_type);
 750
 751         /* This table must be empty if there are no module references left. */
 752         for (i = 0; i < VLAN_GRP_HASH_SIZE; i++)
 753                 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
 754
 755         unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
 756         synchronize_net();
 757
 758         vlan_gvrp_uninit();
 759 }
 760
 761 module_init(vlan_proto_init);
 762 module_exit(vlan_cleanup_module);
 763
 764 MODULE_LICENSE("GPL");
 765 MODULE_VERSION(DRV_VERSION);