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         /* If the group is now empty, kill off the group. */
 169         if (grp->nr_vlans == 0) {
 170                 if (real_dev->features & NETIF_F_HW_VLAN_RX)
 171                         real_dev->vlan_rx_register(real_dev, NULL);
 172
 173                 hlist_del_rcu(&grp->hlist);
 174
 175                 /* Free the group, after all cpu's are done. */
 176                 call_rcu(&grp->rcu, vlan_rcu_free);
 177         }
 178
 179         /* Get rid of the vlan's reference to real_dev */
 180         dev_put(real_dev);
 181
 182         unregister_netdevice(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, unsigned short 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         unsigned short 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         }
 253
 254         err = vlan_group_prealloc_vid(grp, vlan_id);
 255         if (err < 0)
 256                 goto out_free_group;
 257
 258         err = register_netdevice(dev);
 259         if (err < 0)
 260                 goto out_free_group;
 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_free_group:
 282         if (ngrp)
 283                 vlan_group_free(ngrp);
 284         return err;
 285 }
 286
 287 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
 288  *  Returns 0 if the device was created or a negative error code otherwise.
 289  */
 290 static int register_vlan_device(struct net_device *real_dev,
 291                                 unsigned short VLAN_ID)
 292 {
 293         struct net_device *new_dev;
 294         struct net *net = dev_net(real_dev);
 295         struct vlan_net *vn = net_generic(net, vlan_net_id);
 296         char name[IFNAMSIZ];
 297         int err;
 298
 299         if (VLAN_ID >= VLAN_VID_MASK)
 300                 return -ERANGE;
 301
 302         err = vlan_check_real_dev(real_dev, VLAN_ID);
 303         if (err < 0)
 304                 return err;
 305
 306         /* Gotta set up the fields for the device. */
 307         switch (vn->name_type) {
 308         case VLAN_NAME_TYPE_RAW_PLUS_VID:
 309                 /* name will look like:  eth1.0005 */
 310                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, VLAN_ID);
 311                 break;
 312         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
 313                 /* Put our vlan.VID in the name.
 314                  * Name will look like:  vlan5
 315                  */
 316                 snprintf(name, IFNAMSIZ, "vlan%i", VLAN_ID);
 317                 break;
 318         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
 319                 /* Put our vlan.VID in the name.
 320                  * Name will look like:  eth0.5
 321                  */
 322                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, VLAN_ID);
 323                 break;
 324         case VLAN_NAME_TYPE_PLUS_VID:
 325                 /* Put our vlan.VID in the name.
 326                  * Name will look like:  vlan0005
 327                  */
 328         default:
 329                 snprintf(name, IFNAMSIZ, "vlan%.4i", VLAN_ID);
 330         }
 331
 332         new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
 333                                vlan_setup);
 334
 335         if (new_dev == NULL)
 336                 return -ENOBUFS;
 337
 338         dev_net_set(new_dev, net);
 339         /* need 4 bytes for extra VLAN header info,
 340          * hope the underlying device can handle it.
 341          */
 342         new_dev->mtu = real_dev->mtu;
 343
 344         vlan_dev_info(new_dev)->vlan_id = VLAN_ID; /* 1 through VLAN_VID_MASK */
 345         vlan_dev_info(new_dev)->real_dev = real_dev;
 346         vlan_dev_info(new_dev)->dent = NULL;
 347         vlan_dev_info(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
 348
 349         new_dev->rtnl_link_ops = &vlan_link_ops;
 350         err = register_vlan_dev(new_dev);
 351         if (err < 0)
 352                 goto out_free_newdev;
 353
 354         return 0;
 355
 356 out_free_newdev:
 357         free_netdev(new_dev);
 358         return err;
 359 }
 360
 361 static void vlan_sync_address(struct net_device *dev,
 362                               struct net_device *vlandev)
 363 {
 364         struct vlan_dev_info *vlan = vlan_dev_info(vlandev);
 365
 366         /* May be called without an actual change */
 367         if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
 368                 return;
 369
 370         /* vlan address was different from the old address and is equal to
 371          * the new address */
 372         if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
 373             !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
 374                 dev_unicast_delete(dev, vlandev->dev_addr, ETH_ALEN);
 375
 376         /* vlan address was equal to the old address and is different from
 377          * the new address */
 378         if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
 379             compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
 380                 dev_unicast_add(dev, vlandev->dev_addr, ETH_ALEN);
 381
 382         memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
 383 }
 384
 385 static void vlan_transfer_features(struct net_device *dev,
 386                                    struct net_device *vlandev)
 387 {
 388         unsigned long old_features = vlandev->features;
 389
 390         vlandev->features &= ~dev->vlan_features;
 391         vlandev->features |= dev->features & dev->vlan_features;
 392
 393         if (old_features != vlandev->features)
 394                 netdev_features_change(vlandev);
 395 }
 396
 397 static void __vlan_device_event(struct net_device *dev, unsigned long event)
 398 {
 399         switch (event) {
 400         case NETDEV_CHANGENAME:
 401                 vlan_proc_rem_dev(dev);
 402                 if (vlan_proc_add_dev(dev) < 0)
 403                         pr_warning("8021q: failed to change proc name for %s\n",
 404                                         dev->name);
 405                 break;
 406         case NETDEV_REGISTER:
 407                 if (vlan_proc_add_dev(dev) < 0)
 408                         pr_warning("8021q: failed to add proc entry for %s\n",
 409                                         dev->name);
 410                 break;
 411         case NETDEV_UNREGISTER:
 412                 vlan_proc_rem_dev(dev);
 413                 break;
 414         }
 415 }
 416
 417 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
 418                              void *ptr)
 419 {
 420         struct net_device *dev = ptr;
 421         struct vlan_group *grp;
 422         int i, flgs;
 423         struct net_device *vlandev;
 424
 425         if (is_vlan_dev(dev))
 426                 __vlan_device_event(dev, event);
 427
 428         grp = __vlan_find_group(dev);
 429         if (!grp)
 430                 goto out;
 431
 432         /* It is OK that we do not hold the group lock right now,
 433          * as we run under the RTNL lock.
 434          */
 435
 436         switch (event) {
 437         case NETDEV_CHANGE:
 438                 /* Propagate real device state to vlan devices */
 439                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 440                         vlandev = vlan_group_get_device(grp, i);
 441                         if (!vlandev)
 442                                 continue;
 443
 444                         vlan_transfer_operstate(dev, vlandev);
 445                 }
 446                 break;
 447
 448         case NETDEV_CHANGEADDR:
 449                 /* Adjust unicast filters on underlying device */
 450                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 451                         vlandev = vlan_group_get_device(grp, i);
 452                         if (!vlandev)
 453                                 continue;
 454
 455                         flgs = vlandev->flags;
 456                         if (!(flgs & IFF_UP))
 457                                 continue;
 458
 459                         vlan_sync_address(dev, vlandev);
 460                 }
 461                 break;
 462
 463         case NETDEV_FEAT_CHANGE:
 464                 /* Propagate device features to underlying device */
 465                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 466                         vlandev = vlan_group_get_device(grp, i);
 467                         if (!vlandev)
 468                                 continue;
 469
 470                         vlan_transfer_features(dev, vlandev);
 471                 }
 472
 473                 break;
 474
 475         case NETDEV_DOWN:
 476                 /* Put all VLANs for this dev in the down state too.  */
 477                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 478                         vlandev = vlan_group_get_device(grp, i);
 479                         if (!vlandev)
 480                                 continue;
 481
 482                         flgs = vlandev->flags;
 483                         if (!(flgs & IFF_UP))
 484                                 continue;
 485
 486                         dev_change_flags(vlandev, flgs & ~IFF_UP);
 487                 }
 488                 break;
 489
 490         case NETDEV_UP:
 491                 /* Put all VLANs for this dev in the up state too.  */
 492                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 493                         vlandev = vlan_group_get_device(grp, i);
 494                         if (!vlandev)
 495                                 continue;
 496
 497                         flgs = vlandev->flags;
 498                         if (flgs & IFF_UP)
 499                                 continue;
 500
 501                         dev_change_flags(vlandev, flgs | IFF_UP);
 502                 }
 503                 break;
 504
 505         case NETDEV_UNREGISTER:
 506                 /* Delete all VLANs for this dev. */
 507                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 508                         vlandev = vlan_group_get_device(grp, i);
 509                         if (!vlandev)
 510                                 continue;
 511
 512                         /* unregistration of last vlan destroys group, abort
 513                          * afterwards */
 514                         if (grp->nr_vlans == 1)
 515                                 i = VLAN_GROUP_ARRAY_LEN;
 516
 517                         unregister_vlan_dev(vlandev);
 518                 }
 519                 break;
 520         }
 521
 522 out:
 523         return NOTIFY_DONE;
 524 }
 525
 526 static struct notifier_block vlan_notifier_block __read_mostly = {
 527         .notifier_call = vlan_device_event,
 528 };
 529
 530 /*
 531  *      VLAN IOCTL handler.
 532  *      o execute requested action or pass command to the device driver
 533  *   arg is really a struct vlan_ioctl_args __user *.
 534  */
 535 static int vlan_ioctl_handler(struct net *net, void __user *arg)
 536 {
 537         int err;
 538         unsigned short vid = 0;
 539         struct vlan_ioctl_args args;
 540         struct net_device *dev = NULL;
 541
 542         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 543                 return -EFAULT;
 544
 545         /* Null terminate this sucker, just in case. */
 546         args.device1[23] = 0;
 547         args.u.device2[23] = 0;
 548
 549         rtnl_lock();
 550
 551         switch (args.cmd) {
 552         case SET_VLAN_INGRESS_PRIORITY_CMD:
 553         case SET_VLAN_EGRESS_PRIORITY_CMD:
 554         case SET_VLAN_FLAG_CMD:
 555         case ADD_VLAN_CMD:
 556         case DEL_VLAN_CMD:
 557         case GET_VLAN_REALDEV_NAME_CMD:
 558         case GET_VLAN_VID_CMD:
 559                 err = -ENODEV;
 560                 dev = __dev_get_by_name(net, args.device1);
 561                 if (!dev)
 562                         goto out;
 563
 564                 err = -EINVAL;
 565                 if (args.cmd != ADD_VLAN_CMD &&
 566                     !(dev->priv_flags & IFF_802_1Q_VLAN))
 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_set_vlan_flag(dev,
 595                                              args.u.flag,
 596                                              args.vlan_qos);
 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                 vlan_dev_get_vid(dev, &vid);
 641                 args.u.VID = vid;
 642                 if (copy_to_user(arg, &args,
 643                                  sizeof(struct vlan_ioctl_args)))
 644                       err = -EFAULT;
 645                 break;
 646
 647         default:
 648                 err = -EOPNOTSUPP;
 649                 break;
 650         }
 651 out:
 652         rtnl_unlock();
 653         return err;
 654 }
 655
 656 static int vlan_init_net(struct net *net)
 657 {
 658         int err;
 659         struct vlan_net *vn;
 660
 661         err = -ENOMEM;
 662         vn = kzalloc(sizeof(struct vlan_net), GFP_KERNEL);
 663         if (vn == NULL)
 664                 goto err_alloc;
 665
 666         err = net_assign_generic(net, vlan_net_id, vn);
 667         if (err < 0)
 668                 goto err_assign;
 669
 670         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
 671
 672         err = vlan_proc_init(net);
 673         if (err < 0)
 674                 goto err_proc;
 675
 676         return 0;
 677
 678 err_proc:
 679         /* nothing */
 680 err_assign:
 681         kfree(vn);
 682 err_alloc:
 683         return err;
 684 }
 685
 686 static void vlan_exit_net(struct net *net)
 687 {
 688         struct vlan_net *vn;
 689
 690         vn = net_generic(net, vlan_net_id);
 691         rtnl_kill_links(net, &vlan_link_ops);
 692         vlan_proc_cleanup(net);
 693         kfree(vn);
 694 }
 695
 696 static struct pernet_operations vlan_net_ops = {
 697         .init = vlan_init_net,
 698         .exit = vlan_exit_net,
 699 };
 700
 701 static int __init vlan_proto_init(void)
 702 {
 703         int err;
 704
 705         pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright);
 706         pr_info("All bugs added by %s\n", vlan_buggyright);
 707
 708         err = register_pernet_gen_device(&vlan_net_id, &vlan_net_ops);
 709         if (err < 0)
 710                 goto err0;
 711
 712         err = register_netdevice_notifier(&vlan_notifier_block);
 713         if (err < 0)
 714                 goto err2;
 715
 716         err = vlan_netlink_init();
 717         if (err < 0)
 718                 goto err3;
 719
 720         dev_add_pack(&vlan_packet_type);
 721         vlan_ioctl_set(vlan_ioctl_handler);
 722         return 0;
 723
 724 err3:
 725         unregister_netdevice_notifier(&vlan_notifier_block);
 726 err2:
 727         unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
 728 err0:
 729         return err;
 730 }
 731
 732 static void __exit vlan_cleanup_module(void)
 733 {
 734         unsigned int i;
 735
 736         vlan_ioctl_set(NULL);
 737         vlan_netlink_fini();
 738
 739         unregister_netdevice_notifier(&vlan_notifier_block);
 740
 741         dev_remove_pack(&vlan_packet_type);
 742
 743         /* This table must be empty if there are no module references left. */
 744         for (i = 0; i < VLAN_GRP_HASH_SIZE; i++)
 745                 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
 746
 747         unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
 748
 749         synchronize_net();
 750 }
 751
 752 module_init(vlan_proto_init);
 753 module_exit(vlan_cleanup_module);
 754
 755 MODULE_LICENSE("GPL");
 756 MODULE_VERSION(DRV_VERSION);