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 <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 static struct packet_type vlan_packet_type = {
  56         .type = __constant_htons(ETH_P_8021Q),
  57         .func = vlan_skb_recv, /* VLAN receive method */
  58 };
  59
  60 /* End of global variables definitions. */
  61
  62 static inline unsigned int vlan_grp_hashfn(unsigned int idx)
  63 {
  64         return ((idx >> VLAN_GRP_HASH_SHIFT) ^ idx) & VLAN_GRP_HASH_MASK;
  65 }
  66
  67 /* Must be invoked with RCU read lock (no preempt) */
  68 static struct vlan_group *__vlan_find_group(struct net_device *real_dev)
  69 {
  70         struct vlan_group *grp;
  71         struct hlist_node *n;
  72         int hash = vlan_grp_hashfn(real_dev->ifindex);
  73
  74         hlist_for_each_entry_rcu(grp, n, &vlan_group_hash[hash], hlist) {
  75                 if (grp->real_dev == real_dev)
  76                         return grp;
  77         }
  78
  79         return NULL;
  80 }
  81
  82 /*  Find the protocol handler.  Assumes VID < VLAN_VID_MASK.
  83  *
  84  * Must be invoked with RCU read lock (no preempt)
  85  */
  86 struct net_device *__find_vlan_dev(struct net_device *real_dev,
  87                                    unsigned short VID)
  88 {
  89         struct vlan_group *grp = __vlan_find_group(real_dev);
  90
  91         if (grp)
  92                 return vlan_group_get_device(grp, VID);
  93
  94         return NULL;
  95 }
  96
  97 static void vlan_group_free(struct vlan_group *grp)
  98 {
  99         int i;
 100
 101         for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
 102                 kfree(grp->vlan_devices_arrays[i]);
 103         kfree(grp);
 104 }
 105
 106 static struct vlan_group *vlan_group_alloc(struct net_device *real_dev)
 107 {
 108         struct vlan_group *grp;
 109
 110         grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
 111         if (!grp)
 112                 return NULL;
 113
 114         grp->real_dev = real_dev;
 115         hlist_add_head_rcu(&grp->hlist,
 116                         &vlan_group_hash[vlan_grp_hashfn(real_dev->ifindex)]);
 117         return grp;
 118 }
 119
 120 static int vlan_group_prealloc_vid(struct vlan_group *vg, int vid)
 121 {
 122         struct net_device **array;
 123         unsigned int size;
 124
 125         ASSERT_RTNL();
 126
 127         array = vg->vlan_devices_arrays[vid / VLAN_GROUP_ARRAY_PART_LEN];
 128         if (array != NULL)
 129                 return 0;
 130
 131         size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
 132         array = kzalloc(size, GFP_KERNEL);
 133         if (array == NULL)
 134                 return -ENOBUFS;
 135
 136         vg->vlan_devices_arrays[vid / VLAN_GROUP_ARRAY_PART_LEN] = array;
 137         return 0;
 138 }
 139
 140 static void vlan_rcu_free(struct rcu_head *rcu)
 141 {
 142         vlan_group_free(container_of(rcu, struct vlan_group, rcu));
 143 }
 144
 145 void unregister_vlan_dev(struct net_device *dev)
 146 {
 147         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 148         struct net_device *real_dev = vlan->real_dev;
 149         struct vlan_group *grp;
 150         unsigned short vlan_id = vlan->vlan_id;
 151
 152         ASSERT_RTNL();
 153
 154         grp = __vlan_find_group(real_dev);
 155         BUG_ON(!grp);
 156
 157         /* Take it out of our own structures, but be sure to interlock with
 158          * HW accelerating devices or SW vlan input packet processing.
 159          */
 160         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 161                 real_dev->vlan_rx_kill_vid(real_dev, vlan_id);
 162
 163         vlan_group_set_device(grp, vlan_id, NULL);
 164         grp->nr_vlans--;
 165
 166         synchronize_net();
 167
 168         unregister_netdevice(dev);
 169
 170         /* If the group is now empty, kill off the group. */
 171         if (grp->nr_vlans == 0) {
 172                 vlan_gvrp_uninit_applicant(real_dev);
 173
 174                 if (real_dev->features & NETIF_F_HW_VLAN_RX)
 175                         real_dev->vlan_rx_register(real_dev, NULL);
 176
 177                 hlist_del_rcu(&grp->hlist);
 178
 179                 /* Free the group, after all cpu's are done. */
 180                 call_rcu(&grp->rcu, vlan_rcu_free);
 181         }
 182
 183         /* Get rid of the vlan's reference to real_dev */
 184         dev_put(real_dev);
 185 }
 186
 187 static void vlan_transfer_operstate(const struct net_device *dev,
 188                                     struct net_device *vlandev)
 189 {
 190         /* Have to respect userspace enforced dormant state
 191          * of real device, also must allow supplicant running
 192          * on VLAN device
 193          */
 194         if (dev->operstate == IF_OPER_DORMANT)
 195                 netif_dormant_on(vlandev);
 196         else
 197                 netif_dormant_off(vlandev);
 198
 199         if (netif_carrier_ok(dev)) {
 200                 if (!netif_carrier_ok(vlandev))
 201                         netif_carrier_on(vlandev);
 202         } else {
 203                 if (netif_carrier_ok(vlandev))
 204                         netif_carrier_off(vlandev);
 205         }
 206 }
 207
 208 int vlan_check_real_dev(struct net_device *real_dev, unsigned short vlan_id)
 209 {
 210         char *name = real_dev->name;
 211
 212         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
 213                 pr_info("8021q: VLANs not supported on %s\n", name);
 214                 return -EOPNOTSUPP;
 215         }
 216
 217         if ((real_dev->features & NETIF_F_HW_VLAN_RX) &&
 218             !real_dev->vlan_rx_register) {
 219                 pr_info("8021q: device %s has buggy VLAN hw accel\n", name);
 220                 return -EOPNOTSUPP;
 221         }
 222
 223         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 224             (!real_dev->vlan_rx_add_vid || !real_dev->vlan_rx_kill_vid)) {
 225                 pr_info("8021q: Device %s has buggy VLAN hw accel\n", name);
 226                 return -EOPNOTSUPP;
 227         }
 228
 229         /* The real device must be up and operating in order to
 230          * assosciate a VLAN device with it.
 231          */
 232         if (!(real_dev->flags & IFF_UP))
 233                 return -ENETDOWN;
 234
 235         if (__find_vlan_dev(real_dev, vlan_id) != NULL)
 236                 return -EEXIST;
 237
 238         return 0;
 239 }
 240
 241 int register_vlan_dev(struct net_device *dev)
 242 {
 243         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 244         struct net_device *real_dev = vlan->real_dev;
 245         unsigned short vlan_id = vlan->vlan_id;
 246         struct vlan_group *grp, *ngrp = NULL;
 247         int err;
 248
 249         grp = __vlan_find_group(real_dev);
 250         if (!grp) {
 251                 ngrp = grp = vlan_group_alloc(real_dev);
 252                 if (!grp)
 253                         return -ENOBUFS;
 254                 err = vlan_gvrp_init_applicant(real_dev);
 255                 if (err < 0)
 256                         goto out_free_group;
 257         }
 258
 259         err = vlan_group_prealloc_vid(grp, vlan_id);
 260         if (err < 0)
 261                 goto out_uninit_applicant;
 262
 263         err = register_netdevice(dev);
 264         if (err < 0)
 265                 goto out_uninit_applicant;
 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         return 0;
 285
 286 out_uninit_applicant:
 287         if (ngrp)
 288                 vlan_gvrp_uninit_applicant(real_dev);
 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         struct net *net = dev_net(real_dev);
 303         struct vlan_net *vn = net_generic(net, vlan_net_id);
 304         char name[IFNAMSIZ];
 305         int err;
 306
 307         if (VLAN_ID >= VLAN_VID_MASK)
 308                 return -ERANGE;
 309
 310         err = vlan_check_real_dev(real_dev, VLAN_ID);
 311         if (err < 0)
 312                 return err;
 313
 314         /* Gotta set up the fields for the device. */
 315         switch (vn->name_type) {
 316         case VLAN_NAME_TYPE_RAW_PLUS_VID:
 317                 /* name will look like:  eth1.0005 */
 318                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, VLAN_ID);
 319                 break;
 320         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
 321                 /* Put our vlan.VID in the name.
 322                  * Name will look like:  vlan5
 323                  */
 324                 snprintf(name, IFNAMSIZ, "vlan%i", VLAN_ID);
 325                 break;
 326         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
 327                 /* Put our vlan.VID in the name.
 328                  * Name will look like:  eth0.5
 329                  */
 330                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, VLAN_ID);
 331                 break;
 332         case VLAN_NAME_TYPE_PLUS_VID:
 333                 /* Put our vlan.VID in the name.
 334                  * Name will look like:  vlan0005
 335                  */
 336         default:
 337                 snprintf(name, IFNAMSIZ, "vlan%.4i", VLAN_ID);
 338         }
 339
 340         new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
 341                                vlan_setup);
 342
 343         if (new_dev == NULL)
 344                 return -ENOBUFS;
 345
 346         dev_net_set(new_dev, net);
 347         /* need 4 bytes for extra VLAN header info,
 348          * hope the underlying device can handle it.
 349          */
 350         new_dev->mtu = real_dev->mtu;
 351
 352         vlan_dev_info(new_dev)->vlan_id = VLAN_ID; /* 1 through VLAN_VID_MASK */
 353         vlan_dev_info(new_dev)->real_dev = real_dev;
 354         vlan_dev_info(new_dev)->dent = NULL;
 355         vlan_dev_info(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
 356
 357         new_dev->rtnl_link_ops = &vlan_link_ops;
 358         err = register_vlan_dev(new_dev);
 359         if (err < 0)
 360                 goto out_free_newdev;
 361
 362         return 0;
 363
 364 out_free_newdev:
 365         free_netdev(new_dev);
 366         return err;
 367 }
 368
 369 static void vlan_sync_address(struct net_device *dev,
 370                               struct net_device *vlandev)
 371 {
 372         struct vlan_dev_info *vlan = vlan_dev_info(vlandev);
 373
 374         /* May be called without an actual change */
 375         if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
 376                 return;
 377
 378         /* vlan address was different from the old address and is equal to
 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_delete(dev, vlandev->dev_addr, ETH_ALEN);
 383
 384         /* vlan address was equal to the old address and is different from
 385          * the new address */
 386         if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
 387             compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
 388                 dev_unicast_add(dev, vlandev->dev_addr, ETH_ALEN);
 389
 390         memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
 391 }
 392
 393 static void vlan_transfer_features(struct net_device *dev,
 394                                    struct net_device *vlandev)
 395 {
 396         unsigned long old_features = vlandev->features;
 397
 398         vlandev->features &= ~dev->vlan_features;
 399         vlandev->features |= dev->features & dev->vlan_features;
 400
 401         if (old_features != vlandev->features)
 402                 netdev_features_change(vlandev);
 403 }
 404
 405 static void __vlan_device_event(struct net_device *dev, unsigned long event)
 406 {
 407         switch (event) {
 408         case NETDEV_CHANGENAME:
 409                 vlan_proc_rem_dev(dev);
 410                 if (vlan_proc_add_dev(dev) < 0)
 411                         pr_warning("8021q: failed to change proc name for %s\n",
 412                                         dev->name);
 413                 break;
 414         case NETDEV_REGISTER:
 415                 if (vlan_proc_add_dev(dev) < 0)
 416                         pr_warning("8021q: failed to add proc entry for %s\n",
 417                                         dev->name);
 418                 break;
 419         case NETDEV_UNREGISTER:
 420                 vlan_proc_rem_dev(dev);
 421                 break;
 422         }
 423 }
 424
 425 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
 426                              void *ptr)
 427 {
 428         struct net_device *dev = ptr;
 429         struct vlan_group *grp;
 430         int i, flgs;
 431         struct net_device *vlandev;
 432
 433         if (is_vlan_dev(dev))
 434                 __vlan_device_event(dev, event);
 435
 436         grp = __vlan_find_group(dev);
 437         if (!grp)
 438                 goto out;
 439
 440         /* It is OK that we do not hold the group lock right now,
 441          * as we run under the RTNL lock.
 442          */
 443
 444         switch (event) {
 445         case NETDEV_CHANGE:
 446                 /* Propagate real device state to vlan devices */
 447                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 448                         vlandev = vlan_group_get_device(grp, i);
 449                         if (!vlandev)
 450                                 continue;
 451
 452                         vlan_transfer_operstate(dev, vlandev);
 453                 }
 454                 break;
 455
 456         case NETDEV_CHANGEADDR:
 457                 /* Adjust unicast filters on underlying device */
 458                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 459                         vlandev = vlan_group_get_device(grp, i);
 460                         if (!vlandev)
 461                                 continue;
 462
 463                         flgs = vlandev->flags;
 464                         if (!(flgs & IFF_UP))
 465                                 continue;
 466
 467                         vlan_sync_address(dev, vlandev);
 468                 }
 469                 break;
 470
 471         case NETDEV_FEAT_CHANGE:
 472                 /* Propagate device features to underlying device */
 473                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 474                         vlandev = vlan_group_get_device(grp, i);
 475                         if (!vlandev)
 476                                 continue;
 477
 478                         vlan_transfer_features(dev, vlandev);
 479                 }
 480
 481                 break;
 482
 483         case NETDEV_DOWN:
 484                 /* Put all VLANs for this dev in the down state too.  */
 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                         flgs = vlandev->flags;
 491                         if (!(flgs & IFF_UP))
 492                                 continue;
 493
 494                         dev_change_flags(vlandev, flgs & ~IFF_UP);
 495                 }
 496                 break;
 497
 498         case NETDEV_UP:
 499                 /* Put all VLANs for this dev in the up state too.  */
 500                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 501                         vlandev = vlan_group_get_device(grp, i);
 502                         if (!vlandev)
 503                                 continue;
 504
 505                         flgs = vlandev->flags;
 506                         if (flgs & IFF_UP)
 507                                 continue;
 508
 509                         dev_change_flags(vlandev, flgs | IFF_UP);
 510                 }
 511                 break;
 512
 513         case NETDEV_UNREGISTER:
 514                 /* Delete all VLANs for this dev. */
 515                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 516                         vlandev = vlan_group_get_device(grp, i);
 517                         if (!vlandev)
 518                                 continue;
 519
 520                         /* unregistration of last vlan destroys group, abort
 521                          * afterwards */
 522                         if (grp->nr_vlans == 1)
 523                                 i = VLAN_GROUP_ARRAY_LEN;
 524
 525                         unregister_vlan_dev(vlandev);
 526                 }
 527                 break;
 528         }
 529
 530 out:
 531         return NOTIFY_DONE;
 532 }
 533
 534 static struct notifier_block vlan_notifier_block __read_mostly = {
 535         .notifier_call = vlan_device_event,
 536 };
 537
 538 /*
 539  *      VLAN IOCTL handler.
 540  *      o execute requested action or pass command to the device driver
 541  *   arg is really a struct vlan_ioctl_args __user *.
 542  */
 543 static int vlan_ioctl_handler(struct net *net, void __user *arg)
 544 {
 545         int err;
 546         unsigned short vid = 0;
 547         struct vlan_ioctl_args args;
 548         struct net_device *dev = NULL;
 549
 550         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 551                 return -EFAULT;
 552
 553         /* Null terminate this sucker, just in case. */
 554         args.device1[23] = 0;
 555         args.u.device2[23] = 0;
 556
 557         rtnl_lock();
 558
 559         switch (args.cmd) {
 560         case SET_VLAN_INGRESS_PRIORITY_CMD:
 561         case SET_VLAN_EGRESS_PRIORITY_CMD:
 562         case SET_VLAN_FLAG_CMD:
 563         case ADD_VLAN_CMD:
 564         case DEL_VLAN_CMD:
 565         case GET_VLAN_REALDEV_NAME_CMD:
 566         case GET_VLAN_VID_CMD:
 567                 err = -ENODEV;
 568                 dev = __dev_get_by_name(net, args.device1);
 569                 if (!dev)
 570                         goto out;
 571
 572                 err = -EINVAL;
 573                 if (args.cmd != ADD_VLAN_CMD &&
 574                     !(dev->priv_flags & IFF_802_1Q_VLAN))
 575                         goto out;
 576         }
 577
 578         switch (args.cmd) {
 579         case SET_VLAN_INGRESS_PRIORITY_CMD:
 580                 err = -EPERM;
 581                 if (!capable(CAP_NET_ADMIN))
 582                         break;
 583                 vlan_dev_set_ingress_priority(dev,
 584                                               args.u.skb_priority,
 585                                               args.vlan_qos);
 586                 err = 0;
 587                 break;
 588
 589         case SET_VLAN_EGRESS_PRIORITY_CMD:
 590                 err = -EPERM;
 591                 if (!capable(CAP_NET_ADMIN))
 592                         break;
 593                 err = vlan_dev_set_egress_priority(dev,
 594                                                    args.u.skb_priority,
 595                                                    args.vlan_qos);
 596                 break;
 597
 598         case SET_VLAN_FLAG_CMD:
 599                 err = -EPERM;
 600                 if (!capable(CAP_NET_ADMIN))
 601                         break;
 602                 err = vlan_dev_change_flags(dev,
 603                                             args.vlan_qos ? args.u.flag : 0,
 604                                             args.u.flag);
 605                 break;
 606
 607         case SET_VLAN_NAME_TYPE_CMD:
 608                 err = -EPERM;
 609                 if (!capable(CAP_NET_ADMIN))
 610                         break;
 611                 if ((args.u.name_type >= 0) &&
 612                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
 613                         struct vlan_net *vn;
 614
 615                         vn = net_generic(net, vlan_net_id);
 616                         vn->name_type = args.u.name_type;
 617                         err = 0;
 618                 } else {
 619                         err = -EINVAL;
 620                 }
 621                 break;
 622
 623         case ADD_VLAN_CMD:
 624                 err = -EPERM;
 625                 if (!capable(CAP_NET_ADMIN))
 626                         break;
 627                 err = register_vlan_device(dev, args.u.VID);
 628                 break;
 629
 630         case DEL_VLAN_CMD:
 631                 err = -EPERM;
 632                 if (!capable(CAP_NET_ADMIN))
 633                         break;
 634                 unregister_vlan_dev(dev);
 635                 err = 0;
 636                 break;
 637
 638         case GET_VLAN_REALDEV_NAME_CMD:
 639                 err = 0;
 640                 vlan_dev_get_realdev_name(dev, args.u.device2);
 641                 if (copy_to_user(arg, &args,
 642                                  sizeof(struct vlan_ioctl_args)))
 643                         err = -EFAULT;
 644                 break;
 645
 646         case GET_VLAN_VID_CMD:
 647                 err = 0;
 648                 vlan_dev_get_vid(dev, &vid);
 649                 args.u.VID = vid;
 650                 if (copy_to_user(arg, &args,
 651                                  sizeof(struct vlan_ioctl_args)))
 652                       err = -EFAULT;
 653                 break;
 654
 655         default:
 656                 err = -EOPNOTSUPP;
 657                 break;
 658         }
 659 out:
 660         rtnl_unlock();
 661         return err;
 662 }
 663
 664 static int vlan_init_net(struct net *net)
 665 {
 666         int err;
 667         struct vlan_net *vn;
 668
 669         err = -ENOMEM;
 670         vn = kzalloc(sizeof(struct vlan_net), GFP_KERNEL);
 671         if (vn == NULL)
 672                 goto err_alloc;
 673
 674         err = net_assign_generic(net, vlan_net_id, vn);
 675         if (err < 0)
 676                 goto err_assign;
 677
 678         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
 679
 680         err = vlan_proc_init(net);
 681         if (err < 0)
 682                 goto err_proc;
 683
 684         return 0;
 685
 686 err_proc:
 687         /* nothing */
 688 err_assign:
 689         kfree(vn);
 690 err_alloc:
 691         return err;
 692 }
 693
 694 static void vlan_exit_net(struct net *net)
 695 {
 696         struct vlan_net *vn;
 697
 698         vn = net_generic(net, vlan_net_id);
 699         rtnl_kill_links(net, &vlan_link_ops);
 700         vlan_proc_cleanup(net);
 701         kfree(vn);
 702 }
 703
 704 static struct pernet_operations vlan_net_ops = {
 705         .init = vlan_init_net,
 706         .exit = vlan_exit_net,
 707 };
 708
 709 static int __init vlan_proto_init(void)
 710 {
 711         int err;
 712
 713         pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright);
 714         pr_info("All bugs added by %s\n", vlan_buggyright);
 715
 716         err = register_pernet_gen_device(&vlan_net_id, &vlan_net_ops);
 717         if (err < 0)
 718                 goto err0;
 719
 720         err = register_netdevice_notifier(&vlan_notifier_block);
 721         if (err < 0)
 722                 goto err2;
 723
 724         err = vlan_gvrp_init();
 725         if (err < 0)
 726                 goto err3;
 727
 728         err = vlan_netlink_init();
 729         if (err < 0)
 730                 goto err4;
 731
 732         dev_add_pack(&vlan_packet_type);
 733         vlan_ioctl_set(vlan_ioctl_handler);
 734         return 0;
 735
 736 err4:
 737         vlan_gvrp_uninit();
 738 err3:
 739         unregister_netdevice_notifier(&vlan_notifier_block);
 740 err2:
 741         unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
 742 err0:
 743         return err;
 744 }
 745
 746 static void __exit vlan_cleanup_module(void)
 747 {
 748         unsigned int i;
 749
 750         vlan_ioctl_set(NULL);
 751         vlan_netlink_fini();
 752
 753         unregister_netdevice_notifier(&vlan_notifier_block);
 754
 755         dev_remove_pack(&vlan_packet_type);
 756
 757         /* This table must be empty if there are no module references left. */
 758         for (i = 0; i < VLAN_GRP_HASH_SIZE; i++)
 759                 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
 760
 761         unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
 762         synchronize_net();
 763
 764         vlan_gvrp_uninit();
 765 }
 766
 767 module_init(vlan_proto_init);
 768 module_exit(vlan_cleanup_module);
 769
 770 MODULE_LICENSE("GPL");
 771 MODULE_VERSION(DRV_VERSION);