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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  22
  23 #include <linux/capability.h>
  24 #include <linux/module.h>
  25 #include <linux/netdevice.h>
  26 #include <linux/skbuff.h>
  27 #include <linux/slab.h>
  28 #include <linux/init.h>
  29 #include <linux/rculist.h>
  30 #include <net/p8022.h>
  31 #include <net/arp.h>
  32 #include <linux/rtnetlink.h>
  33 #include <linux/notifier.h>
  34 #include <net/rtnetlink.h>
  35 #include <net/net_namespace.h>
  36 #include <net/netns/generic.h>
  37 #include <linux/uaccess.h>
  38
  39 #include <linux/if_vlan.h>
  40 #include "vlan.h"
  41 #include "vlanproc.h"
  42
  43 #define DRV_VERSION "1.8"
  44
  45 /* Global VLAN variables */
  46
  47 unsigned int vlan_net_id __read_mostly;
  48
  49 const char vlan_fullname[] = "802.1Q VLAN Support";
  50 const char vlan_version[] = DRV_VERSION;
  51
  52 /* End of global variables definitions. */
  53
  54 static int vlan_group_prealloc_vid(struct vlan_group *vg,
  55                                    __be16 vlan_proto, u16 vlan_id)
  56 {
  57         struct net_device **array;
  58         unsigned int pidx, vidx;
  59         unsigned int size;
  60
  61         ASSERT_RTNL();
  62
  63         pidx  = vlan_proto_idx(vlan_proto);
  64         vidx  = vlan_id / VLAN_GROUP_ARRAY_PART_LEN;
  65         array = vg->vlan_devices_arrays[pidx][vidx];
  66         if (array != NULL)
  67                 return 0;
  68
  69         size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
  70         array = kzalloc(size, GFP_KERNEL);
  71         if (array == NULL)
  72                 return -ENOBUFS;
  73
  74         vg->vlan_devices_arrays[pidx][vidx] = array;
  75         return 0;
  76 }
  77
  78 void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
  79 {
  80         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
  81         struct net_device *real_dev = vlan->real_dev;
  82         struct vlan_info *vlan_info;
  83         struct vlan_group *grp;
  84         u16 vlan_id = vlan->vlan_id;
  85
  86         ASSERT_RTNL();
  87
  88         vlan_info = rtnl_dereference(real_dev->vlan_info);
  89         BUG_ON(!vlan_info);
  90
  91         grp = &vlan_info->grp;
  92
  93         grp->nr_vlan_devs--;
  94
  95         if (vlan->flags & VLAN_FLAG_MVRP)
  96                 vlan_mvrp_request_leave(dev);
  97         if (vlan->flags & VLAN_FLAG_GVRP)
  98                 vlan_gvrp_request_leave(dev);
  99
 100         vlan_group_set_device(grp, vlan->vlan_proto, vlan_id, NULL);
 101
 102         netdev_upper_dev_unlink(real_dev, dev);
 103         /* Because unregister_netdevice_queue() makes sure at least one rcu
 104          * grace period is respected before device freeing,
 105          * we dont need to call synchronize_net() here.
 106          */
 107         unregister_netdevice_queue(dev, head);
 108
 109         if (grp->nr_vlan_devs == 0) {
 110                 vlan_mvrp_uninit_applicant(real_dev);
 111                 vlan_gvrp_uninit_applicant(real_dev);
 112         }
 113
 114         vlan_vid_del(real_dev, vlan->vlan_proto, vlan_id);
 115
 116         /* Get rid of the vlan's reference to real_dev */
 117         dev_put(real_dev);
 118 }
 119
 120 int vlan_check_real_dev(struct net_device *real_dev,
 121                         __be16 protocol, u16 vlan_id,
 122                         struct netlink_ext_ack *extack)
 123 {
 124         const char *name = real_dev->name;
 125
 126         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
 127                 pr_info("VLANs not supported on %s\n", name);
 128                 NL_SET_ERR_MSG_MOD(extack, "VLANs not supported on device");
 129                 return -EOPNOTSUPP;
 130         }
 131
 132         if (vlan_find_dev(real_dev, protocol, vlan_id) != NULL) {
 133                 NL_SET_ERR_MSG_MOD(extack, "VLAN device already exists");
 134                 return -EEXIST;
 135         }
 136
 137         return 0;
 138 }
 139
 140 int register_vlan_dev(struct net_device *dev, struct netlink_ext_ack *extack)
 141 {
 142         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 143         struct net_device *real_dev = vlan->real_dev;
 144         u16 vlan_id = vlan->vlan_id;
 145         struct vlan_info *vlan_info;
 146         struct vlan_group *grp;
 147         int err;
 148
 149         err = vlan_vid_add(real_dev, vlan->vlan_proto, vlan_id);
 150         if (err)
 151                 return err;
 152
 153         vlan_info = rtnl_dereference(real_dev->vlan_info);
 154         /* vlan_info should be there now. vlan_vid_add took care of it */
 155         BUG_ON(!vlan_info);
 156
 157         grp = &vlan_info->grp;
 158         if (grp->nr_vlan_devs == 0) {
 159                 err = vlan_gvrp_init_applicant(real_dev);
 160                 if (err < 0)
 161                         goto out_vid_del;
 162                 err = vlan_mvrp_init_applicant(real_dev);
 163                 if (err < 0)
 164                         goto out_uninit_gvrp;
 165         }
 166
 167         err = vlan_group_prealloc_vid(grp, vlan->vlan_proto, vlan_id);
 168         if (err < 0)
 169                 goto out_uninit_mvrp;
 170
 171         vlan->nest_level = dev_get_nest_level(real_dev) + 1;
 172         err = register_netdevice(dev);
 173         if (err < 0)
 174                 goto out_uninit_mvrp;
 175
 176         err = netdev_upper_dev_link(real_dev, dev, extack);
 177         if (err)
 178                 goto out_unregister_netdev;
 179
 180         /* Account for reference in struct vlan_dev_priv */
 181         dev_hold(real_dev);
 182
 183         netif_stacked_transfer_operstate(real_dev, dev);
 184         linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
 185
 186         /* So, got the sucker initialized, now lets place
 187          * it into our local structure.
 188          */
 189         vlan_group_set_device(grp, vlan->vlan_proto, vlan_id, dev);
 190         grp->nr_vlan_devs++;
 191
 192         return 0;
 193
 194 out_unregister_netdev:
 195         unregister_netdevice(dev);
 196 out_uninit_mvrp:
 197         if (grp->nr_vlan_devs == 0)
 198                 vlan_mvrp_uninit_applicant(real_dev);
 199 out_uninit_gvrp:
 200         if (grp->nr_vlan_devs == 0)
 201                 vlan_gvrp_uninit_applicant(real_dev);
 202 out_vid_del:
 203         vlan_vid_del(real_dev, vlan->vlan_proto, vlan_id);
 204         return err;
 205 }
 206
 207 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
 208  *  Returns 0 if the device was created or a negative error code otherwise.
 209  */
 210 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
 211 {
 212         struct net_device *new_dev;
 213         struct vlan_dev_priv *vlan;
 214         struct net *net = dev_net(real_dev);
 215         struct vlan_net *vn = net_generic(net, vlan_net_id);
 216         char name[IFNAMSIZ];
 217         int err;
 218
 219         if (vlan_id >= VLAN_VID_MASK)
 220                 return -ERANGE;
 221
 222         err = vlan_check_real_dev(real_dev, htons(ETH_P_8021Q), vlan_id,
 223                                   NULL);
 224         if (err < 0)
 225                 return err;
 226
 227         /* Gotta set up the fields for the device. */
 228         switch (vn->name_type) {
 229         case VLAN_NAME_TYPE_RAW_PLUS_VID:
 230                 /* name will look like:  eth1.0005 */
 231                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
 232                 break;
 233         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
 234                 /* Put our vlan.VID in the name.
 235                  * Name will look like:  vlan5
 236                  */
 237                 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
 238                 break;
 239         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
 240                 /* Put our vlan.VID in the name.
 241                  * Name will look like:  eth0.5
 242                  */
 243                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
 244                 break;
 245         case VLAN_NAME_TYPE_PLUS_VID:
 246                 /* Put our vlan.VID in the name.
 247                  * Name will look like:  vlan0005
 248                  */
 249         default:
 250                 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
 251         }
 252
 253         new_dev = alloc_netdev(sizeof(struct vlan_dev_priv), name,
 254                                NET_NAME_UNKNOWN, vlan_setup);
 255
 256         if (new_dev == NULL)
 257                 return -ENOBUFS;
 258
 259         dev_net_set(new_dev, net);
 260         /* need 4 bytes for extra VLAN header info,
 261          * hope the underlying device can handle it.
 262          */
 263         new_dev->mtu = real_dev->mtu;
 264
 265         vlan = vlan_dev_priv(new_dev);
 266         vlan->vlan_proto = htons(ETH_P_8021Q);
 267         vlan->vlan_id = vlan_id;
 268         vlan->real_dev = real_dev;
 269         vlan->dent = NULL;
 270         vlan->flags = VLAN_FLAG_REORDER_HDR;
 271
 272         new_dev->rtnl_link_ops = &vlan_link_ops;
 273         err = register_vlan_dev(new_dev, NULL);
 274         if (err < 0)
 275                 goto out_free_newdev;
 276
 277         return 0;
 278
 279 out_free_newdev:
 280         if (new_dev->reg_state == NETREG_UNINITIALIZED)
 281                 free_netdev(new_dev);
 282         return err;
 283 }
 284
 285 static void vlan_sync_address(struct net_device *dev,
 286                               struct net_device *vlandev)
 287 {
 288         struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
 289
 290         /* May be called without an actual change */
 291         if (ether_addr_equal(vlan->real_dev_addr, dev->dev_addr))
 292                 return;
 293
 294         /* vlan continues to inherit address of lower device */
 295         if (vlan_dev_inherit_address(vlandev, dev))
 296                 goto out;
 297
 298         /* vlan address was different from the old address and is equal to
 299          * the new address */
 300         if (!ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) &&
 301             ether_addr_equal(vlandev->dev_addr, dev->dev_addr))
 302                 dev_uc_del(dev, vlandev->dev_addr);
 303
 304         /* vlan address was equal to the old address and is different from
 305          * the new address */
 306         if (ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) &&
 307             !ether_addr_equal(vlandev->dev_addr, dev->dev_addr))
 308                 dev_uc_add(dev, vlandev->dev_addr);
 309
 310 out:
 311         ether_addr_copy(vlan->real_dev_addr, dev->dev_addr);
 312 }
 313
 314 static void vlan_transfer_features(struct net_device *dev,
 315                                    struct net_device *vlandev)
 316 {
 317         struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
 318
 319         vlandev->gso_max_size = dev->gso_max_size;
 320         vlandev->gso_max_segs = dev->gso_max_segs;
 321
 322         if (vlan_hw_offload_capable(dev->features, vlan->vlan_proto))
 323                 vlandev->hard_header_len = dev->hard_header_len;
 324         else
 325                 vlandev->hard_header_len = dev->hard_header_len + VLAN_HLEN;
 326
 327 #if IS_ENABLED(CONFIG_FCOE)
 328         vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
 329 #endif
 330
 331         vlandev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
 332         vlandev->priv_flags |= (vlan->real_dev->priv_flags & IFF_XMIT_DST_RELEASE);
 333         vlandev->hw_enc_features = vlan_tnl_features(vlan->real_dev);
 334
 335         netdev_update_features(vlandev);
 336 }
 337
 338 static int __vlan_device_event(struct net_device *dev, unsigned long event)
 339 {
 340         int err = 0;
 341
 342         switch (event) {
 343         case NETDEV_CHANGENAME:
 344                 vlan_proc_rem_dev(dev);
 345                 err = vlan_proc_add_dev(dev);
 346                 break;
 347         case NETDEV_REGISTER:
 348                 err = vlan_proc_add_dev(dev);
 349                 break;
 350         case NETDEV_UNREGISTER:
 351                 vlan_proc_rem_dev(dev);
 352                 break;
 353         }
 354
 355         return err;
 356 }
 357
 358 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
 359                              void *ptr)
 360 {
 361         struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr);
 362         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 363         struct vlan_group *grp;
 364         struct vlan_info *vlan_info;
 365         int i, flgs;
 366         struct net_device *vlandev;
 367         struct vlan_dev_priv *vlan;
 368         bool last = false;
 369         LIST_HEAD(list);
 370         int err;
 371
 372         if (is_vlan_dev(dev)) {
 373                 int err = __vlan_device_event(dev, event);
 374
 375                 if (err)
 376                         return notifier_from_errno(err);
 377         }
 378
 379         if ((event == NETDEV_UP) &&
 380             (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)) {
 381                 pr_info("adding VLAN 0 to HW filter on device %s\n",
 382                         dev->name);
 383                 vlan_vid_add(dev, htons(ETH_P_8021Q), 0);
 384         }
 385         if (event == NETDEV_DOWN &&
 386             (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER))
 387                 vlan_vid_del(dev, htons(ETH_P_8021Q), 0);
 388
 389         vlan_info = rtnl_dereference(dev->vlan_info);
 390         if (!vlan_info)
 391                 goto out;
 392         grp = &vlan_info->grp;
 393
 394         /* It is OK that we do not hold the group lock right now,
 395          * as we run under the RTNL lock.
 396          */
 397
 398         switch (event) {
 399         case NETDEV_CHANGE:
 400                 /* Propagate real device state to vlan devices */
 401                 vlan_group_for_each_dev(grp, i, vlandev)
 402                         netif_stacked_transfer_operstate(dev, vlandev);
 403                 break;
 404
 405         case NETDEV_CHANGEADDR:
 406                 /* Adjust unicast filters on underlying device */
 407                 vlan_group_for_each_dev(grp, i, vlandev) {
 408                         flgs = vlandev->flags;
 409                         if (!(flgs & IFF_UP))
 410                                 continue;
 411
 412                         vlan_sync_address(dev, vlandev);
 413                 }
 414                 break;
 415
 416         case NETDEV_CHANGEMTU:
 417                 vlan_group_for_each_dev(grp, i, vlandev) {
 418                         if (vlandev->mtu <= dev->mtu)
 419                                 continue;
 420
 421                         dev_set_mtu(vlandev, dev->mtu);
 422                 }
 423                 break;
 424
 425         case NETDEV_FEAT_CHANGE:
 426                 /* Propagate device features to underlying device */
 427                 vlan_group_for_each_dev(grp, i, vlandev)
 428                         vlan_transfer_features(dev, vlandev);
 429                 break;
 430
 431         case NETDEV_DOWN: {
 432                 struct net_device *tmp;
 433                 LIST_HEAD(close_list);
 434
 435                 /* Put all VLANs for this dev in the down state too.  */
 436                 vlan_group_for_each_dev(grp, i, vlandev) {
 437                         flgs = vlandev->flags;
 438                         if (!(flgs & IFF_UP))
 439                                 continue;
 440
 441                         vlan = vlan_dev_priv(vlandev);
 442                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 443                                 list_add(&vlandev->close_list, &close_list);
 444                 }
 445
 446                 dev_close_many(&close_list, false);
 447
 448                 list_for_each_entry_safe(vlandev, tmp, &close_list, close_list) {
 449                         netif_stacked_transfer_operstate(dev, vlandev);
 450                         list_del_init(&vlandev->close_list);
 451                 }
 452                 list_del(&close_list);
 453                 break;
 454         }
 455         case NETDEV_UP:
 456                 /* Put all VLANs for this dev in the up state too.  */
 457                 vlan_group_for_each_dev(grp, i, vlandev) {
 458                         flgs = dev_get_flags(vlandev);
 459                         if (flgs & IFF_UP)
 460                                 continue;
 461
 462                         vlan = vlan_dev_priv(vlandev);
 463                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 464                                 dev_change_flags(vlandev, flgs | IFF_UP,
 465                                                  extack);
 466                         netif_stacked_transfer_operstate(dev, vlandev);
 467                 }
 468                 break;
 469
 470         case NETDEV_UNREGISTER:
 471                 /* twiddle thumbs on netns device moves */
 472                 if (dev->reg_state != NETREG_UNREGISTERING)
 473                         break;
 474
 475                 vlan_group_for_each_dev(grp, i, vlandev) {
 476                         /* removal of last vid destroys vlan_info, abort
 477                          * afterwards */
 478                         if (vlan_info->nr_vids == 1)
 479                                 last = true;
 480
 481                         unregister_vlan_dev(vlandev, &list);
 482                         if (last)
 483                                 break;
 484                 }
 485                 unregister_netdevice_many(&list);
 486                 break;
 487
 488         case NETDEV_PRE_TYPE_CHANGE:
 489                 /* Forbid underlaying device to change its type. */
 490                 if (vlan_uses_dev(dev))
 491                         return NOTIFY_BAD;
 492                 break;
 493
 494         case NETDEV_NOTIFY_PEERS:
 495         case NETDEV_BONDING_FAILOVER:
 496         case NETDEV_RESEND_IGMP:
 497                 /* Propagate to vlan devices */
 498                 vlan_group_for_each_dev(grp, i, vlandev)
 499                         call_netdevice_notifiers(event, vlandev);
 500                 break;
 501
 502         case NETDEV_CVLAN_FILTER_PUSH_INFO:
 503                 err = vlan_filter_push_vids(vlan_info, htons(ETH_P_8021Q));
 504                 if (err)
 505                         return notifier_from_errno(err);
 506                 break;
 507
 508         case NETDEV_CVLAN_FILTER_DROP_INFO:
 509                 vlan_filter_drop_vids(vlan_info, htons(ETH_P_8021Q));
 510                 break;
 511
 512         case NETDEV_SVLAN_FILTER_PUSH_INFO:
 513                 err = vlan_filter_push_vids(vlan_info, htons(ETH_P_8021AD));
 514                 if (err)
 515                         return notifier_from_errno(err);
 516                 break;
 517
 518         case NETDEV_SVLAN_FILTER_DROP_INFO:
 519                 vlan_filter_drop_vids(vlan_info, htons(ETH_P_8021AD));
 520                 break;
 521         }
 522
 523 out:
 524         return NOTIFY_DONE;
 525 }
 526
 527 static struct notifier_block vlan_notifier_block __read_mostly = {
 528         .notifier_call = vlan_device_event,
 529 };
 530
 531 /*
 532  *      VLAN IOCTL handler.
 533  *      o execute requested action or pass command to the device driver
 534  *   arg is really a struct vlan_ioctl_args __user *.
 535  */
 536 static int vlan_ioctl_handler(struct net *net, void __user *arg)
 537 {
 538         int err;
 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[sizeof(args.device1) - 1] = 0;
 547         args.u.device2[sizeof(args.u.device2) - 1] = 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 && !is_vlan_dev(dev))
 566                         goto out;
 567         }
 568
 569         switch (args.cmd) {
 570         case SET_VLAN_INGRESS_PRIORITY_CMD:
 571                 err = -EPERM;
 572                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 573                         break;
 574                 vlan_dev_set_ingress_priority(dev,
 575                                               args.u.skb_priority,
 576                                               args.vlan_qos);
 577                 err = 0;
 578                 break;
 579
 580         case SET_VLAN_EGRESS_PRIORITY_CMD:
 581                 err = -EPERM;
 582                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 583                         break;
 584                 err = vlan_dev_set_egress_priority(dev,
 585                                                    args.u.skb_priority,
 586                                                    args.vlan_qos);
 587                 break;
 588
 589         case SET_VLAN_FLAG_CMD:
 590                 err = -EPERM;
 591                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 592                         break;
 593                 err = vlan_dev_change_flags(dev,
 594                                             args.vlan_qos ? args.u.flag : 0,
 595                                             args.u.flag);
 596                 break;
 597
 598         case SET_VLAN_NAME_TYPE_CMD:
 599                 err = -EPERM;
 600                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 601                         break;
 602                 if (args.u.name_type < VLAN_NAME_TYPE_HIGHEST) {
 603                         struct vlan_net *vn;
 604
 605                         vn = net_generic(net, vlan_net_id);
 606                         vn->name_type = args.u.name_type;
 607                         err = 0;
 608                 } else {
 609                         err = -EINVAL;
 610                 }
 611                 break;
 612
 613         case ADD_VLAN_CMD:
 614                 err = -EPERM;
 615                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 616                         break;
 617                 err = register_vlan_device(dev, args.u.VID);
 618                 break;
 619
 620         case DEL_VLAN_CMD:
 621                 err = -EPERM;
 622                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 623                         break;
 624                 unregister_vlan_dev(dev, NULL);
 625                 err = 0;
 626                 break;
 627
 628         case GET_VLAN_REALDEV_NAME_CMD:
 629                 err = 0;
 630                 vlan_dev_get_realdev_name(dev, args.u.device2);
 631                 if (copy_to_user(arg, &args,
 632                                  sizeof(struct vlan_ioctl_args)))
 633                         err = -EFAULT;
 634                 break;
 635
 636         case GET_VLAN_VID_CMD:
 637                 err = 0;
 638                 args.u.VID = vlan_dev_vlan_id(dev);
 639                 if (copy_to_user(arg, &args,
 640                                  sizeof(struct vlan_ioctl_args)))
 641                       err = -EFAULT;
 642                 break;
 643
 644         default:
 645                 err = -EOPNOTSUPP;
 646                 break;
 647         }
 648 out:
 649         rtnl_unlock();
 650         return err;
 651 }
 652
 653 static int __net_init vlan_init_net(struct net *net)
 654 {
 655         struct vlan_net *vn = net_generic(net, vlan_net_id);
 656         int err;
 657
 658         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
 659
 660         err = vlan_proc_init(net);
 661
 662         return err;
 663 }
 664
 665 static void __net_exit vlan_exit_net(struct net *net)
 666 {
 667         vlan_proc_cleanup(net);
 668 }
 669
 670 static struct pernet_operations vlan_net_ops = {
 671         .init = vlan_init_net,
 672         .exit = vlan_exit_net,
 673         .id   = &vlan_net_id,
 674         .size = sizeof(struct vlan_net),
 675 };
 676
 677 static int __init vlan_proto_init(void)
 678 {
 679         int err;
 680
 681         pr_info("%s v%s\n", vlan_fullname, vlan_version);
 682
 683         err = register_pernet_subsys(&vlan_net_ops);
 684         if (err < 0)
 685                 goto err0;
 686
 687         err = register_netdevice_notifier(&vlan_notifier_block);
 688         if (err < 0)
 689                 goto err2;
 690
 691         err = vlan_gvrp_init();
 692         if (err < 0)
 693                 goto err3;
 694
 695         err = vlan_mvrp_init();
 696         if (err < 0)
 697                 goto err4;
 698
 699         err = vlan_netlink_init();
 700         if (err < 0)
 701                 goto err5;
 702
 703         vlan_ioctl_set(vlan_ioctl_handler);
 704         return 0;
 705
 706 err5:
 707         vlan_mvrp_uninit();
 708 err4:
 709         vlan_gvrp_uninit();
 710 err3:
 711         unregister_netdevice_notifier(&vlan_notifier_block);
 712 err2:
 713         unregister_pernet_subsys(&vlan_net_ops);
 714 err0:
 715         return err;
 716 }
 717
 718 static void __exit vlan_cleanup_module(void)
 719 {
 720         vlan_ioctl_set(NULL);
 721
 722         vlan_netlink_fini();
 723
 724         unregister_netdevice_notifier(&vlan_notifier_block);
 725
 726         unregister_pernet_subsys(&vlan_net_ops);
 727         rcu_barrier(); /* Wait for completion of call_rcu()'s */
 728
 729         vlan_mvrp_uninit();
 730         vlan_gvrp_uninit();
 731 }
 732
 733 module_init(vlan_proto_init);
 734 module_exit(vlan_cleanup_module);
 735
 736 MODULE_LICENSE("GPL");
 737 MODULE_VERSION(DRV_VERSION);