git.oblomov.eu Git - linux-2.6/blob - 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         vlandev->gso_max_size = dev->gso_max_size;
 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_FEAT_CHANGE:
 470                 /* Propagate device features to underlying device */
 471                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 472                         vlandev = vlan_group_get_device(grp, i);
 473                         if (!vlandev)
 474                                 continue;
 475
 476                         vlan_transfer_features(dev, vlandev);
 477                 }
 478
 479                 break;
 480
 481         case NETDEV_DOWN:
 482                 /* Put all VLANs for this dev in the down state too.  */
 483                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 484                         vlandev = vlan_group_get_device(grp, i);
 485                         if (!vlandev)
 486                                 continue;
 487
 488                         flgs = vlandev->flags;
 489                         if (!(flgs & IFF_UP))
 490                                 continue;
 491
 492                         dev_change_flags(vlandev, flgs & ~IFF_UP);
 493                 }
 494                 break;
 495
 496         case NETDEV_UP:
 497                 /* Put all VLANs for this dev in the up state too.  */
 498                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 499                         vlandev = vlan_group_get_device(grp, i);
 500                         if (!vlandev)
 501                                 continue;
 502
 503                         flgs = vlandev->flags;
 504                         if (flgs & IFF_UP)
 505                                 continue;
 506
 507                         dev_change_flags(vlandev, flgs | IFF_UP);
 508                 }
 509                 break;
 510
 511         case NETDEV_UNREGISTER:
 512                 /* Delete all VLANs for this dev. */
 513                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 514                         vlandev = vlan_group_get_device(grp, i);
 515                         if (!vlandev)
 516                                 continue;
 517
 518                         /* unregistration of last vlan destroys group, abort
 519                          * afterwards */
 520                         if (grp->nr_vlans == 1)
 521                                 i = VLAN_GROUP_ARRAY_LEN;
 522
 523                         unregister_vlan_dev(vlandev);
 524                 }
 525                 break;
 526         }
 527
 528 out:
 529         return NOTIFY_DONE;
 530 }
 531
 532 static struct notifier_block vlan_notifier_block __read_mostly = {
 533         .notifier_call = vlan_device_event,
 534 };
 535
 536 /*
 537  *      VLAN IOCTL handler.
 538  *      o execute requested action or pass command to the device driver
 539  *   arg is really a struct vlan_ioctl_args __user *.
 540  */
 541 static int vlan_ioctl_handler(struct net *net, void __user *arg)
 542 {
 543         int err;
 544         struct vlan_ioctl_args args;
 545         struct net_device *dev = NULL;
 546
 547         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 548                 return -EFAULT;
 549
 550         /* Null terminate this sucker, just in case. */
 551         args.device1[23] = 0;
 552         args.u.device2[23] = 0;
 553
 554         rtnl_lock();
 555
 556         switch (args.cmd) {
 557         case SET_VLAN_INGRESS_PRIORITY_CMD:
 558         case SET_VLAN_EGRESS_PRIORITY_CMD:
 559         case SET_VLAN_FLAG_CMD:
 560         case ADD_VLAN_CMD:
 561         case DEL_VLAN_CMD:
 562         case GET_VLAN_REALDEV_NAME_CMD:
 563         case GET_VLAN_VID_CMD:
 564                 err = -ENODEV;
 565                 dev = __dev_get_by_name(net, args.device1);
 566                 if (!dev)
 567                         goto out;
 568
 569                 err = -EINVAL;
 570                 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
 571                         goto out;
 572         }
 573
 574         switch (args.cmd) {
 575         case SET_VLAN_INGRESS_PRIORITY_CMD:
 576                 err = -EPERM;
 577                 if (!capable(CAP_NET_ADMIN))
 578                         break;
 579                 vlan_dev_set_ingress_priority(dev,
 580                                               args.u.skb_priority,
 581                                               args.vlan_qos);
 582                 err = 0;
 583                 break;
 584
 585         case SET_VLAN_EGRESS_PRIORITY_CMD:
 586                 err = -EPERM;
 587                 if (!capable(CAP_NET_ADMIN))
 588                         break;
 589                 err = vlan_dev_set_egress_priority(dev,
 590                                                    args.u.skb_priority,
 591                                                    args.vlan_qos);
 592                 break;
 593
 594         case SET_VLAN_FLAG_CMD:
 595                 err = -EPERM;
 596                 if (!capable(CAP_NET_ADMIN))
 597                         break;
 598                 err = vlan_dev_change_flags(dev,
 599                                             args.vlan_qos ? args.u.flag : 0,
 600                                             args.u.flag);
 601                 break;
 602
 603         case SET_VLAN_NAME_TYPE_CMD:
 604                 err = -EPERM;
 605                 if (!capable(CAP_NET_ADMIN))
 606                         break;
 607                 if ((args.u.name_type >= 0) &&
 608                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
 609                         struct vlan_net *vn;
 610
 611                         vn = net_generic(net, vlan_net_id);
 612                         vn->name_type = args.u.name_type;
 613                         err = 0;
 614                 } else {
 615                         err = -EINVAL;
 616                 }
 617                 break;
 618
 619         case ADD_VLAN_CMD:
 620                 err = -EPERM;
 621                 if (!capable(CAP_NET_ADMIN))
 622                         break;
 623                 err = register_vlan_device(dev, args.u.VID);
 624                 break;
 625
 626         case DEL_VLAN_CMD:
 627                 err = -EPERM;
 628                 if (!capable(CAP_NET_ADMIN))
 629                         break;
 630                 unregister_vlan_dev(dev);
 631                 err = 0;
 632                 break;
 633
 634         case GET_VLAN_REALDEV_NAME_CMD:
 635                 err = 0;
 636                 vlan_dev_get_realdev_name(dev, args.u.device2);
 637                 if (copy_to_user(arg, &args,
 638                                  sizeof(struct vlan_ioctl_args)))
 639                         err = -EFAULT;
 640                 break;
 641
 642         case GET_VLAN_VID_CMD:
 643                 err = 0;
 644                 args.u.VID = vlan_dev_vlan_id(dev);
 645                 if (copy_to_user(arg, &args,
 646                                  sizeof(struct vlan_ioctl_args)))
 647                       err = -EFAULT;
 648                 break;
 649
 650         default:
 651                 err = -EOPNOTSUPP;
 652                 break;
 653         }
 654 out:
 655         rtnl_unlock();
 656         return err;
 657 }
 658
 659 static int vlan_init_net(struct net *net)
 660 {
 661         int err;
 662         struct vlan_net *vn;
 663
 664         err = -ENOMEM;
 665         vn = kzalloc(sizeof(struct vlan_net), GFP_KERNEL);
 666         if (vn == NULL)
 667                 goto err_alloc;
 668
 669         err = net_assign_generic(net, vlan_net_id, vn);
 670         if (err < 0)
 671                 goto err_assign;
 672
 673         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
 674
 675         err = vlan_proc_init(net);
 676         if (err < 0)
 677                 goto err_proc;
 678
 679         return 0;
 680
 681 err_proc:
 682         /* nothing */
 683 err_assign:
 684         kfree(vn);
 685 err_alloc:
 686         return err;
 687 }
 688
 689 static void vlan_exit_net(struct net *net)
 690 {
 691         struct vlan_net *vn;
 692
 693         vn = net_generic(net, vlan_net_id);
 694         rtnl_kill_links(net, &vlan_link_ops);
 695         vlan_proc_cleanup(net);
 696         kfree(vn);
 697 }
 698
 699 static struct pernet_operations vlan_net_ops = {
 700         .init = vlan_init_net,
 701         .exit = vlan_exit_net,
 702 };
 703
 704 static int __init vlan_proto_init(void)
 705 {
 706         int err;
 707
 708         pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright);
 709         pr_info("All bugs added by %s\n", vlan_buggyright);
 710
 711         err = register_pernet_gen_device(&vlan_net_id, &vlan_net_ops);
 712         if (err < 0)
 713                 goto err0;
 714
 715         err = register_netdevice_notifier(&vlan_notifier_block);
 716         if (err < 0)
 717                 goto err2;
 718
 719         err = vlan_gvrp_init();
 720         if (err < 0)
 721                 goto err3;
 722
 723         err = vlan_netlink_init();
 724         if (err < 0)
 725                 goto err4;
 726
 727         dev_add_pack(&vlan_packet_type);
 728         vlan_ioctl_set(vlan_ioctl_handler);
 729         return 0;
 730
 731 err4:
 732         vlan_gvrp_uninit();
 733 err3:
 734         unregister_netdevice_notifier(&vlan_notifier_block);
 735 err2:
 736         unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
 737 err0:
 738         return err;
 739 }
 740
 741 static void __exit vlan_cleanup_module(void)
 742 {
 743         unsigned int i;
 744
 745         vlan_ioctl_set(NULL);
 746         vlan_netlink_fini();
 747
 748         unregister_netdevice_notifier(&vlan_notifier_block);
 749
 750         dev_remove_pack(&vlan_packet_type);
 751
 752         /* This table must be empty if there are no module references left. */
 753         for (i = 0; i < VLAN_GRP_HASH_SIZE; i++)
 754                 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
 755
 756         unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
 757         synchronize_net();
 758
 759         vlan_gvrp_uninit();
 760 }
 761
 762 module_init(vlan_proto_init);
 763 module_exit(vlan_cleanup_module);
 764
 765 MODULE_LICENSE("GPL");
 766 MODULE_VERSION(DRV_VERSION);