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 __read_mostly;
  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, struct list_head *head)
 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         grp->nr_vlans--;
 163
 164         vlan_group_set_device(grp, vlan_id, NULL);
 165         if (!grp->killall)
 166                 synchronize_net();
 167
 168         unregister_netdevice_queue(dev, head);
 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                         ops->ndo_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, u16 vlan_id)
 209 {
 210         const char *name = real_dev->name;
 211         const struct net_device_ops *ops = real_dev->netdev_ops;
 212
 213         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
 214                 pr_info("8021q: VLANs not supported on %s\n", name);
 215                 return -EOPNOTSUPP;
 216         }
 217
 218         if ((real_dev->features & NETIF_F_HW_VLAN_RX) && !ops->ndo_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             (!ops->ndo_vlan_rx_add_vid || !ops->ndo_vlan_rx_kill_vid)) {
 225                 pr_info("8021q: Device %s has buggy VLAN hw accel\n", name);
 226                 return -EOPNOTSUPP;
 227         }
 228
 229         if (__find_vlan_dev(real_dev, vlan_id) != NULL)
 230                 return -EEXIST;
 231
 232         return 0;
 233 }
 234
 235 int register_vlan_dev(struct net_device *dev)
 236 {
 237         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 238         struct net_device *real_dev = vlan->real_dev;
 239         const struct net_device_ops *ops = real_dev->netdev_ops;
 240         u16 vlan_id = vlan->vlan_id;
 241         struct vlan_group *grp, *ngrp = NULL;
 242         int err;
 243
 244         grp = __vlan_find_group(real_dev);
 245         if (!grp) {
 246                 ngrp = grp = vlan_group_alloc(real_dev);
 247                 if (!grp)
 248                         return -ENOBUFS;
 249                 err = vlan_gvrp_init_applicant(real_dev);
 250                 if (err < 0)
 251                         goto out_free_group;
 252         }
 253
 254         err = vlan_group_prealloc_vid(grp, vlan_id);
 255         if (err < 0)
 256                 goto out_uninit_applicant;
 257
 258         err = register_netdevice(dev);
 259         if (err < 0)
 260                 goto out_uninit_applicant;
 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                 ops->ndo_vlan_rx_register(real_dev, ngrp);
 276         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 277                 ops->ndo_vlan_rx_add_vid(real_dev, vlan_id);
 278
 279         return 0;
 280
 281 out_uninit_applicant:
 282         if (ngrp)
 283                 vlan_gvrp_uninit_applicant(real_dev);
 284 out_free_group:
 285         if (ngrp) {
 286                 hlist_del_rcu(&ngrp->hlist);
 287                 /* Free the group, after all cpu's are done. */
 288                 call_rcu(&ngrp->rcu, vlan_rcu_free);
 289         }
 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_mq(sizeof(struct vlan_dev_info), name,
 338                                   vlan_setup, real_dev->num_tx_queues);
 339
 340         if (new_dev == NULL)
 341                 return -ENOBUFS;
 342
 343         new_dev->real_num_tx_queues = real_dev->real_num_tx_queues;
 344         dev_net_set(new_dev, net);
 345         /* need 4 bytes for extra VLAN header info,
 346          * hope the underlying device can handle it.
 347          */
 348         new_dev->mtu = real_dev->mtu;
 349
 350         vlan_dev_info(new_dev)->vlan_id = vlan_id;
 351         vlan_dev_info(new_dev)->real_dev = real_dev;
 352         vlan_dev_info(new_dev)->dent = NULL;
 353         vlan_dev_info(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
 354
 355         new_dev->rtnl_link_ops = &vlan_link_ops;
 356         err = register_vlan_dev(new_dev);
 357         if (err < 0)
 358                 goto out_free_newdev;
 359
 360         return 0;
 361
 362 out_free_newdev:
 363         free_netdev(new_dev);
 364         return err;
 365 }
 366
 367 static void vlan_sync_address(struct net_device *dev,
 368                               struct net_device *vlandev)
 369 {
 370         struct vlan_dev_info *vlan = vlan_dev_info(vlandev);
 371
 372         /* May be called without an actual change */
 373         if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
 374                 return;
 375
 376         /* vlan address was different from the old address and is equal to
 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_delete(dev, vlandev->dev_addr);
 381
 382         /* vlan address was equal to the old address and is different from
 383          * the new address */
 384         if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
 385             compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
 386                 dev_unicast_add(dev, vlandev->dev_addr);
 387
 388         memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
 389 }
 390
 391 static void vlan_transfer_features(struct net_device *dev,
 392                                    struct net_device *vlandev)
 393 {
 394         unsigned long old_features = vlandev->features;
 395
 396         vlandev->features &= ~dev->vlan_features;
 397         vlandev->features |= dev->features & dev->vlan_features;
 398         vlandev->gso_max_size = dev->gso_max_size;
 399 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 400         vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
 401 #endif
 402
 403         if (old_features != vlandev->features)
 404                 netdev_features_change(vlandev);
 405 }
 406
 407 static void __vlan_device_event(struct net_device *dev, unsigned long event)
 408 {
 409         switch (event) {
 410         case NETDEV_CHANGENAME:
 411                 vlan_proc_rem_dev(dev);
 412                 if (vlan_proc_add_dev(dev) < 0)
 413                         pr_warning("8021q: failed to change proc name for %s\n",
 414                                         dev->name);
 415                 break;
 416         case NETDEV_REGISTER:
 417                 if (vlan_proc_add_dev(dev) < 0)
 418                         pr_warning("8021q: failed to add proc entry for %s\n",
 419                                         dev->name);
 420                 break;
 421         case NETDEV_UNREGISTER:
 422                 vlan_proc_rem_dev(dev);
 423                 break;
 424         }
 425 }
 426
 427 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
 428                              void *ptr)
 429 {
 430         struct net_device *dev = ptr;
 431         struct vlan_group *grp;
 432         int i, flgs;
 433         struct net_device *vlandev;
 434         LIST_HEAD(list);
 435
 436         if (is_vlan_dev(dev))
 437                 __vlan_device_event(dev, event);
 438
 439         grp = __vlan_find_group(dev);
 440         if (!grp)
 441                 goto out;
 442
 443         /* It is OK that we do not hold the group lock right now,
 444          * as we run under the RTNL lock.
 445          */
 446
 447         switch (event) {
 448         case NETDEV_CHANGE:
 449                 /* Propagate real device state to vlan devices */
 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                         vlan_transfer_operstate(dev, vlandev);
 456                 }
 457                 break;
 458
 459         case NETDEV_CHANGEADDR:
 460                 /* Adjust unicast filters on underlying device */
 461                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 462                         vlandev = vlan_group_get_device(grp, i);
 463                         if (!vlandev)
 464                                 continue;
 465
 466                         flgs = vlandev->flags;
 467                         if (!(flgs & IFF_UP))
 468                                 continue;
 469
 470                         vlan_sync_address(dev, vlandev);
 471                 }
 472                 break;
 473
 474         case NETDEV_CHANGEMTU:
 475                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 476                         vlandev = vlan_group_get_device(grp, i);
 477                         if (!vlandev)
 478                                 continue;
 479
 480                         if (vlandev->mtu <= dev->mtu)
 481                                 continue;
 482
 483                         dev_set_mtu(vlandev, dev->mtu);
 484                 }
 485                 break;
 486
 487         case NETDEV_FEAT_CHANGE:
 488                 /* Propagate device features to underlying device */
 489                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 490                         vlandev = vlan_group_get_device(grp, i);
 491                         if (!vlandev)
 492                                 continue;
 493
 494                         vlan_transfer_features(dev, vlandev);
 495                 }
 496
 497                 break;
 498
 499         case NETDEV_DOWN:
 500                 /* Put all VLANs for this dev in the down 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_UP:
 516                 /* Put all VLANs for this dev in the up state too.  */
 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                         flgs = vlandev->flags;
 523                         if (flgs & IFF_UP)
 524                                 continue;
 525
 526                         dev_change_flags(vlandev, flgs | IFF_UP);
 527                         vlan_transfer_operstate(dev, vlandev);
 528                 }
 529                 break;
 530
 531         case NETDEV_UNREGISTER:
 532                 /* Delete all VLANs for this dev. */
 533                 grp->killall = 1;
 534
 535                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 536                         vlandev = vlan_group_get_device(grp, i);
 537                         if (!vlandev)
 538                                 continue;
 539
 540                         /* unregistration of last vlan destroys group, abort
 541                          * afterwards */
 542                         if (grp->nr_vlans == 1)
 543                                 i = VLAN_GROUP_ARRAY_LEN;
 544
 545                         unregister_vlan_dev(vlandev, &list);
 546                 }
 547                 unregister_netdevice_many(&list);
 548                 break;
 549         }
 550
 551 out:
 552         return NOTIFY_DONE;
 553 }
 554
 555 static struct notifier_block vlan_notifier_block __read_mostly = {
 556         .notifier_call = vlan_device_event,
 557 };
 558
 559 /*
 560  *      VLAN IOCTL handler.
 561  *      o execute requested action or pass command to the device driver
 562  *   arg is really a struct vlan_ioctl_args __user *.
 563  */
 564 static int vlan_ioctl_handler(struct net *net, void __user *arg)
 565 {
 566         int err;
 567         struct vlan_ioctl_args args;
 568         struct net_device *dev = NULL;
 569
 570         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 571                 return -EFAULT;
 572
 573         /* Null terminate this sucker, just in case. */
 574         args.device1[23] = 0;
 575         args.u.device2[23] = 0;
 576
 577         rtnl_lock();
 578
 579         switch (args.cmd) {
 580         case SET_VLAN_INGRESS_PRIORITY_CMD:
 581         case SET_VLAN_EGRESS_PRIORITY_CMD:
 582         case SET_VLAN_FLAG_CMD:
 583         case ADD_VLAN_CMD:
 584         case DEL_VLAN_CMD:
 585         case GET_VLAN_REALDEV_NAME_CMD:
 586         case GET_VLAN_VID_CMD:
 587                 err = -ENODEV;
 588                 dev = __dev_get_by_name(net, args.device1);
 589                 if (!dev)
 590                         goto out;
 591
 592                 err = -EINVAL;
 593                 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
 594                         goto out;
 595         }
 596
 597         switch (args.cmd) {
 598         case SET_VLAN_INGRESS_PRIORITY_CMD:
 599                 err = -EPERM;
 600                 if (!capable(CAP_NET_ADMIN))
 601                         break;
 602                 vlan_dev_set_ingress_priority(dev,
 603                                               args.u.skb_priority,
 604                                               args.vlan_qos);
 605                 err = 0;
 606                 break;
 607
 608         case SET_VLAN_EGRESS_PRIORITY_CMD:
 609                 err = -EPERM;
 610                 if (!capable(CAP_NET_ADMIN))
 611                         break;
 612                 err = vlan_dev_set_egress_priority(dev,
 613                                                    args.u.skb_priority,
 614                                                    args.vlan_qos);
 615                 break;
 616
 617         case SET_VLAN_FLAG_CMD:
 618                 err = -EPERM;
 619                 if (!capable(CAP_NET_ADMIN))
 620                         break;
 621                 err = vlan_dev_change_flags(dev,
 622                                             args.vlan_qos ? args.u.flag : 0,
 623                                             args.u.flag);
 624                 break;
 625
 626         case SET_VLAN_NAME_TYPE_CMD:
 627                 err = -EPERM;
 628                 if (!capable(CAP_NET_ADMIN))
 629                         break;
 630                 if ((args.u.name_type >= 0) &&
 631                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
 632                         struct vlan_net *vn;
 633
 634                         vn = net_generic(net, vlan_net_id);
 635                         vn->name_type = args.u.name_type;
 636                         err = 0;
 637                 } else {
 638                         err = -EINVAL;
 639                 }
 640                 break;
 641
 642         case ADD_VLAN_CMD:
 643                 err = -EPERM;
 644                 if (!capable(CAP_NET_ADMIN))
 645                         break;
 646                 err = register_vlan_device(dev, args.u.VID);
 647                 break;
 648
 649         case DEL_VLAN_CMD:
 650                 err = -EPERM;
 651                 if (!capable(CAP_NET_ADMIN))
 652                         break;
 653                 unregister_vlan_dev(dev, NULL);
 654                 err = 0;
 655                 break;
 656
 657         case GET_VLAN_REALDEV_NAME_CMD:
 658                 err = 0;
 659                 vlan_dev_get_realdev_name(dev, args.u.device2);
 660                 if (copy_to_user(arg, &args,
 661                                  sizeof(struct vlan_ioctl_args)))
 662                         err = -EFAULT;
 663                 break;
 664
 665         case GET_VLAN_VID_CMD:
 666                 err = 0;
 667                 args.u.VID = vlan_dev_vlan_id(dev);
 668                 if (copy_to_user(arg, &args,
 669                                  sizeof(struct vlan_ioctl_args)))
 670                       err = -EFAULT;
 671                 break;
 672
 673         default:
 674                 err = -EOPNOTSUPP;
 675                 break;
 676         }
 677 out:
 678         rtnl_unlock();
 679         return err;
 680 }
 681
 682 static int vlan_init_net(struct net *net)
 683 {
 684         int err;
 685         struct vlan_net *vn;
 686
 687         err = -ENOMEM;
 688         vn = kzalloc(sizeof(struct vlan_net), GFP_KERNEL);
 689         if (vn == NULL)
 690                 goto err_alloc;
 691
 692         err = net_assign_generic(net, vlan_net_id, vn);
 693         if (err < 0)
 694                 goto err_assign;
 695
 696         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
 697
 698         err = vlan_proc_init(net);
 699         if (err < 0)
 700                 goto err_proc;
 701
 702         return 0;
 703
 704 err_proc:
 705         /* nothing */
 706 err_assign:
 707         kfree(vn);
 708 err_alloc:
 709         return err;
 710 }
 711
 712 static void vlan_exit_net(struct net *net)
 713 {
 714         struct vlan_net *vn;
 715
 716         vn = net_generic(net, vlan_net_id);
 717         rtnl_kill_links(net, &vlan_link_ops);
 718         vlan_proc_cleanup(net);
 719         kfree(vn);
 720 }
 721
 722 static struct pernet_operations vlan_net_ops = {
 723         .init = vlan_init_net,
 724         .exit = vlan_exit_net,
 725 };
 726
 727 static int __init vlan_proto_init(void)
 728 {
 729         int err;
 730
 731         pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright);
 732         pr_info("All bugs added by %s\n", vlan_buggyright);
 733
 734         err = register_pernet_gen_device(&vlan_net_id, &vlan_net_ops);
 735         if (err < 0)
 736                 goto err0;
 737
 738         err = register_netdevice_notifier(&vlan_notifier_block);
 739         if (err < 0)
 740                 goto err2;
 741
 742         err = vlan_gvrp_init();
 743         if (err < 0)
 744                 goto err3;
 745
 746         err = vlan_netlink_init();
 747         if (err < 0)
 748                 goto err4;
 749
 750         dev_add_pack(&vlan_packet_type);
 751         vlan_ioctl_set(vlan_ioctl_handler);
 752         return 0;
 753
 754 err4:
 755         vlan_gvrp_uninit();
 756 err3:
 757         unregister_netdevice_notifier(&vlan_notifier_block);
 758 err2:
 759         unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
 760 err0:
 761         return err;
 762 }
 763
 764 static void __exit vlan_cleanup_module(void)
 765 {
 766         unsigned int i;
 767
 768         vlan_ioctl_set(NULL);
 769         vlan_netlink_fini();
 770
 771         unregister_netdevice_notifier(&vlan_notifier_block);
 772
 773         dev_remove_pack(&vlan_packet_type);
 774
 775         /* This table must be empty if there are no module references left. */
 776         for (i = 0; i < VLAN_GRP_HASH_SIZE; i++)
 777                 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
 778
 779         unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
 780         rcu_barrier(); /* Wait for completion of call_rcu()'s */
 781
 782         vlan_gvrp_uninit();
 783 }
 784
 785 module_init(vlan_proto_init);
 786 module_exit(vlan_cleanup_module);
 787
 788 MODULE_LICENSE("GPL");
 789 MODULE_VERSION(DRV_VERSION);