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 const char vlan_fullname[] = "802.1Q VLAN Support";
  50 const char vlan_version[] = DRV_VERSION;
  51 static const char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>";
  52 static const char vlan_buggyright[] = "David S. Miller <davem@redhat.com>";
  53
  54 static struct packet_type vlan_packet_type __read_mostly = {
  55         .type = cpu_to_be16(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         const struct net_device_ops *ops = real_dev->netdev_ops;
 148         struct vlan_group *grp;
 149         u16 vlan_id = vlan->vlan_id;
 150
 151         ASSERT_RTNL();
 152
 153         grp = __vlan_find_group(real_dev);
 154         BUG_ON(!grp);
 155
 156         /* Take it out of our own structures, but be sure to interlock with
 157          * HW accelerating devices or SW vlan input packet processing.
 158          */
 159         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 160                 ops->ndo_vlan_rx_kill_vid(real_dev, vlan_id);
 161
 162         vlan_group_set_device(grp, vlan_id, NULL);
 163         grp->nr_vlans--;
 164
 165         synchronize_net();
 166
 167         unregister_netdevice(dev);
 168
 169         /* If the group is now empty, kill off the group. */
 170         if (grp->nr_vlans == 0) {
 171                 vlan_gvrp_uninit_applicant(real_dev);
 172
 173                 if (real_dev->features & NETIF_F_HW_VLAN_RX)
 174                         ops->ndo_vlan_rx_register(real_dev, NULL);
 175
 176                 hlist_del_rcu(&grp->hlist);
 177
 178                 /* Free the group, after all cpu's are done. */
 179                 call_rcu(&grp->rcu, vlan_rcu_free);
 180         }
 181
 182         /* Get rid of the vlan's reference to real_dev */
 183         dev_put(real_dev);
 184 }
 185
 186 static void vlan_transfer_operstate(const struct net_device *dev,
 187                                     struct net_device *vlandev)
 188 {
 189         /* Have to respect userspace enforced dormant state
 190          * of real device, also must allow supplicant running
 191          * on VLAN device
 192          */
 193         if (dev->operstate == IF_OPER_DORMANT)
 194                 netif_dormant_on(vlandev);
 195         else
 196                 netif_dormant_off(vlandev);
 197
 198         if (netif_carrier_ok(dev)) {
 199                 if (!netif_carrier_ok(vlandev))
 200                         netif_carrier_on(vlandev);
 201         } else {
 202                 if (netif_carrier_ok(vlandev))
 203                         netif_carrier_off(vlandev);
 204         }
 205 }
 206
 207 int vlan_check_real_dev(struct net_device *real_dev, u16 vlan_id)
 208 {
 209         const char *name = real_dev->name;
 210         const struct net_device_ops *ops = real_dev->netdev_ops;
 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) && !ops->ndo_vlan_rx_register) {
 218                 pr_info("8021q: device %s has buggy VLAN hw accel\n", name);
 219                 return -EOPNOTSUPP;
 220         }
 221
 222         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 223             (!ops->ndo_vlan_rx_add_vid || !ops->ndo_vlan_rx_kill_vid)) {
 224                 pr_info("8021q: Device %s has buggy VLAN hw accel\n", name);
 225                 return -EOPNOTSUPP;
 226         }
 227
 228         /* The real device must be up and operating in order to
 229          * assosciate a VLAN device with it.
 230          */
 231         if (!(real_dev->flags & IFF_UP))
 232                 return -ENETDOWN;
 233
 234         if (__find_vlan_dev(real_dev, vlan_id) != NULL)
 235                 return -EEXIST;
 236
 237         return 0;
 238 }
 239
 240 int register_vlan_dev(struct net_device *dev)
 241 {
 242         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 243         struct net_device *real_dev = vlan->real_dev;
 244         const struct net_device_ops *ops = real_dev->netdev_ops;
 245         u16 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                 ops->ndo_vlan_rx_register(real_dev, ngrp);
 281         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 282                 ops->ndo_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, u16 vlan_id)
 299 {
 300         struct net_device *new_dev;
 301         struct net *net = dev_net(real_dev);
 302         struct vlan_net *vn = net_generic(net, vlan_net_id);
 303         char name[IFNAMSIZ];
 304         int err;
 305
 306         if (vlan_id >= VLAN_VID_MASK)
 307                 return -ERANGE;
 308
 309         err = vlan_check_real_dev(real_dev, vlan_id);
 310         if (err < 0)
 311                 return err;
 312
 313         /* Gotta set up the fields for the device. */
 314         switch (vn->name_type) {
 315         case VLAN_NAME_TYPE_RAW_PLUS_VID:
 316                 /* name will look like:  eth1.0005 */
 317                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
 318                 break;
 319         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
 320                 /* Put our vlan.VID in the name.
 321                  * Name will look like:  vlan5
 322                  */
 323                 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
 324                 break;
 325         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
 326                 /* Put our vlan.VID in the name.
 327                  * Name will look like:  eth0.5
 328                  */
 329                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
 330                 break;
 331         case VLAN_NAME_TYPE_PLUS_VID:
 332                 /* Put our vlan.VID in the name.
 333                  * Name will look like:  vlan0005
 334                  */
 335         default:
 336                 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
 337         }
 338
 339         new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
 340                                vlan_setup);
 341
 342         if (new_dev == NULL)
 343                 return -ENOBUFS;
 344
 345         dev_net_set(new_dev, net);
 346         /* need 4 bytes for extra VLAN header info,
 347          * hope the underlying device can handle it.
 348          */
 349         new_dev->mtu = real_dev->mtu;
 350
 351         vlan_dev_info(new_dev)->vlan_id = vlan_id;
 352         vlan_dev_info(new_dev)->real_dev = real_dev;
 353         vlan_dev_info(new_dev)->dent = NULL;
 354         vlan_dev_info(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
 355
 356         new_dev->rtnl_link_ops = &vlan_link_ops;
 357         err = register_vlan_dev(new_dev);
 358         if (err < 0)
 359                 goto out_free_newdev;
 360
 361         return 0;
 362
 363 out_free_newdev:
 364         free_netdev(new_dev);
 365         return err;
 366 }
 367
 368 static void vlan_sync_address(struct net_device *dev,
 369                               struct net_device *vlandev)
 370 {
 371         struct vlan_dev_info *vlan = vlan_dev_info(vlandev);
 372
 373         /* May be called without an actual change */
 374         if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
 375                 return;
 376
 377         /* vlan address was different from the old address and is equal to
 378          * the new address */
 379         if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
 380             !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
 381                 dev_unicast_delete(dev, vlandev->dev_addr, ETH_ALEN);
 382
 383         /* vlan address was equal to the old address and is different from
 384          * the new address */
 385         if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
 386             compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
 387                 dev_unicast_add(dev, vlandev->dev_addr, ETH_ALEN);
 388
 389         memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
 390 }
 391
 392 static void vlan_transfer_features(struct net_device *dev,
 393                                    struct net_device *vlandev)
 394 {
 395         unsigned long old_features = vlandev->features;
 396
 397         vlandev->features &= ~dev->vlan_features;
 398         vlandev->features |= dev->features & dev->vlan_features;
 399         vlandev->gso_max_size = dev->gso_max_size;
 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                         vlan_transfer_operstate(dev, vlandev);
 496                 }
 497                 break;
 498
 499         case NETDEV_UP:
 500                 /* Put all VLANs for this dev in the up state too.  */
 501                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 502                         vlandev = vlan_group_get_device(grp, i);
 503                         if (!vlandev)
 504                                 continue;
 505
 506                         flgs = vlandev->flags;
 507                         if (flgs & IFF_UP)
 508                                 continue;
 509
 510                         dev_change_flags(vlandev, flgs | IFF_UP);
 511                         vlan_transfer_operstate(dev, vlandev);
 512                 }
 513                 break;
 514
 515         case NETDEV_UNREGISTER:
 516                 /* Delete all VLANs for this dev. */
 517                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 518                         vlandev = vlan_group_get_device(grp, i);
 519                         if (!vlandev)
 520                                 continue;
 521
 522                         /* unregistration of last vlan destroys group, abort
 523                          * afterwards */
 524                         if (grp->nr_vlans == 1)
 525                                 i = VLAN_GROUP_ARRAY_LEN;
 526
 527                         unregister_vlan_dev(vlandev);
 528                 }
 529                 break;
 530         }
 531
 532 out:
 533         return NOTIFY_DONE;
 534 }
 535
 536 static struct notifier_block vlan_notifier_block __read_mostly = {
 537         .notifier_call = vlan_device_event,
 538 };
 539
 540 /*
 541  *      VLAN IOCTL handler.
 542  *      o execute requested action or pass command to the device driver
 543  *   arg is really a struct vlan_ioctl_args __user *.
 544  */
 545 static int vlan_ioctl_handler(struct net *net, void __user *arg)
 546 {
 547         int err;
 548         struct vlan_ioctl_args args;
 549         struct net_device *dev = NULL;
 550
 551         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 552                 return -EFAULT;
 553
 554         /* Null terminate this sucker, just in case. */
 555         args.device1[23] = 0;
 556         args.u.device2[23] = 0;
 557
 558         rtnl_lock();
 559
 560         switch (args.cmd) {
 561         case SET_VLAN_INGRESS_PRIORITY_CMD:
 562         case SET_VLAN_EGRESS_PRIORITY_CMD:
 563         case SET_VLAN_FLAG_CMD:
 564         case ADD_VLAN_CMD:
 565         case DEL_VLAN_CMD:
 566         case GET_VLAN_REALDEV_NAME_CMD:
 567         case GET_VLAN_VID_CMD:
 568                 err = -ENODEV;
 569                 dev = __dev_get_by_name(net, args.device1);
 570                 if (!dev)
 571                         goto out;
 572
 573                 err = -EINVAL;
 574                 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
 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                 args.u.VID = vlan_dev_vlan_id(dev);
 649                 if (copy_to_user(arg, &args,
 650                                  sizeof(struct vlan_ioctl_args)))
 651                       err = -EFAULT;
 652                 break;
 653
 654         default:
 655                 err = -EOPNOTSUPP;
 656                 break;
 657         }
 658 out:
 659         rtnl_unlock();
 660         return err;
 661 }
 662
 663 static int vlan_init_net(struct net *net)
 664 {
 665         int err;
 666         struct vlan_net *vn;
 667
 668         err = -ENOMEM;
 669         vn = kzalloc(sizeof(struct vlan_net), GFP_KERNEL);
 670         if (vn == NULL)
 671                 goto err_alloc;
 672
 673         err = net_assign_generic(net, vlan_net_id, vn);
 674         if (err < 0)
 675                 goto err_assign;
 676
 677         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
 678
 679         err = vlan_proc_init(net);
 680         if (err < 0)
 681                 goto err_proc;
 682
 683         return 0;
 684
 685 err_proc:
 686         /* nothing */
 687 err_assign:
 688         kfree(vn);
 689 err_alloc:
 690         return err;
 691 }
 692
 693 static void vlan_exit_net(struct net *net)
 694 {
 695         struct vlan_net *vn;
 696
 697         vn = net_generic(net, vlan_net_id);
 698         rtnl_kill_links(net, &vlan_link_ops);
 699         vlan_proc_cleanup(net);
 700         kfree(vn);
 701 }
 702
 703 static struct pernet_operations vlan_net_ops = {
 704         .init = vlan_init_net,
 705         .exit = vlan_exit_net,
 706 };
 707
 708 static int __init vlan_proto_init(void)
 709 {
 710         int err;
 711
 712         pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright);
 713         pr_info("All bugs added by %s\n", vlan_buggyright);
 714
 715         err = register_pernet_gen_device(&vlan_net_id, &vlan_net_ops);
 716         if (err < 0)
 717                 goto err0;
 718
 719         err = register_netdevice_notifier(&vlan_notifier_block);
 720         if (err < 0)
 721                 goto err2;
 722
 723         err = vlan_gvrp_init();
 724         if (err < 0)
 725                 goto err3;
 726
 727         err = vlan_netlink_init();
 728         if (err < 0)
 729                 goto err4;
 730
 731         dev_add_pack(&vlan_packet_type);
 732         vlan_ioctl_set(vlan_ioctl_handler);
 733         return 0;
 734
 735 err4:
 736         vlan_gvrp_uninit();
 737 err3:
 738         unregister_netdevice_notifier(&vlan_notifier_block);
 739 err2:
 740         unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
 741 err0:
 742         return err;
 743 }
 744
 745 static void __exit vlan_cleanup_module(void)
 746 {
 747         unsigned int i;
 748
 749         vlan_ioctl_set(NULL);
 750         vlan_netlink_fini();
 751
 752         unregister_netdevice_notifier(&vlan_notifier_block);
 753
 754         dev_remove_pack(&vlan_packet_type);
 755
 756         /* This table must be empty if there are no module references left. */
 757         for (i = 0; i < VLAN_GRP_HASH_SIZE; i++)
 758                 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
 759
 760         unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
 761         synchronize_net();
 762
 763         vlan_gvrp_uninit();
 764 }
 765
 766 module_init(vlan_proto_init);
 767 module_exit(vlan_cleanup_module);
 768
 769 MODULE_LICENSE("GPL");
 770 MODULE_VERSION(DRV_VERSION);