net/8021q/vlan.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * INET         802.1Q VLAN
   4  *              Ethernet-type device handling.
   5  *
   6  * Authors:     Ben Greear <greearb@candelatech.com>
   7  *              Please send support related email to: netdev@vger.kernel.org
   8  *              VLAN Home Page: http://www.candelatech.com/~greear/vlan.html
   9  *
  10  * Fixes:
  11  *              Fix for packet capture - Nick Eggleston <nick@dccinc.com>;
  12  *              Add HW acceleration hooks - David S. Miller <davem@redhat.com>;
  13  *              Correct all the locking - David S. Miller <davem@redhat.com>;
  14  *              Use hash table for VLAN groups - David S. Miller <davem@redhat.com>
  15  */
  16
  17 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  18
  19 #include <linux/capability.h>
  20 #include <linux/module.h>
  21 #include <linux/netdevice.h>
  22 #include <linux/skbuff.h>
  23 #include <linux/slab.h>
  24 #include <linux/init.h>
  25 #include <linux/rculist.h>
  26 #include <net/p8022.h>
  27 #include <net/arp.h>
  28 #include <linux/rtnetlink.h>
  29 #include <linux/notifier.h>
  30 #include <net/rtnetlink.h>
  31 #include <net/net_namespace.h>
  32 #include <net/netns/generic.h>
  33 #include <linux/uaccess.h>
  34
  35 #include <linux/if_vlan.h>
  36 #include "vlan.h"
  37 #include "vlanproc.h"
  38
  39 #define DRV_VERSION "1.8"
  40
  41 /* Global VLAN variables */
  42
  43 unsigned int vlan_net_id __read_mostly;
  44
  45 const char vlan_fullname[] = "802.1Q VLAN Support";
  46 const char vlan_version[] = DRV_VERSION;
  47
  48 /* End of global variables definitions. */
  49
  50 static int vlan_group_prealloc_vid(struct vlan_group *vg,
  51                                    __be16 vlan_proto, u16 vlan_id)
  52 {
  53         struct net_device **array;
  54         unsigned int vidx;
  55         unsigned int size;
  56         int pidx;
  57
  58         ASSERT_RTNL();
  59
  60         pidx  = vlan_proto_idx(vlan_proto);
  61         if (pidx < 0)
  62                 return -EINVAL;
  63
  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 static void vlan_stacked_transfer_operstate(const struct net_device *rootdev,
  79                                             struct net_device *dev,
  80                                             struct vlan_dev_priv *vlan)
  81 {
  82         if (!(vlan->flags & VLAN_FLAG_BRIDGE_BINDING))
  83                 netif_stacked_transfer_operstate(rootdev, dev);
  84 }
  85
  86 void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
  87 {
  88         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
  89         struct net_device *real_dev = vlan->real_dev;
  90         struct vlan_info *vlan_info;
  91         struct vlan_group *grp;
  92         u16 vlan_id = vlan->vlan_id;
  93
  94         ASSERT_RTNL();
  95
  96         vlan_info = rtnl_dereference(real_dev->vlan_info);
  97         BUG_ON(!vlan_info);
  98
  99         grp = &vlan_info->grp;
 100
 101         grp->nr_vlan_devs--;
 102
 103         if (vlan->flags & VLAN_FLAG_MVRP)
 104                 vlan_mvrp_request_leave(dev);
 105         if (vlan->flags & VLAN_FLAG_GVRP)
 106                 vlan_gvrp_request_leave(dev);
 107
 108         vlan_group_set_device(grp, vlan->vlan_proto, vlan_id, NULL);
 109
 110         netdev_upper_dev_unlink(real_dev, dev);
 111         /* Because unregister_netdevice_queue() makes sure at least one rcu
 112          * grace period is respected before device freeing,
 113          * we dont need to call synchronize_net() here.
 114          */
 115         unregister_netdevice_queue(dev, head);
 116
 117         if (grp->nr_vlan_devs == 0) {
 118                 vlan_mvrp_uninit_applicant(real_dev);
 119                 vlan_gvrp_uninit_applicant(real_dev);
 120         }
 121
 122         vlan_vid_del(real_dev, vlan->vlan_proto, vlan_id);
 123 }
 124
 125 int vlan_check_real_dev(struct net_device *real_dev,
 126                         __be16 protocol, u16 vlan_id,
 127                         struct netlink_ext_ack *extack)
 128 {
 129         const char *name = real_dev->name;
 130
 131         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
 132                 pr_info("VLANs not supported on %s\n", name);
 133                 NL_SET_ERR_MSG_MOD(extack, "VLANs not supported on device");
 134                 return -EOPNOTSUPP;
 135         }
 136
 137         if (vlan_find_dev(real_dev, protocol, vlan_id) != NULL) {
 138                 NL_SET_ERR_MSG_MOD(extack, "VLAN device already exists");
 139                 return -EEXIST;
 140         }
 141
 142         return 0;
 143 }
 144
 145 int register_vlan_dev(struct net_device *dev, struct netlink_ext_ack *extack)
 146 {
 147         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 148         struct net_device *real_dev = vlan->real_dev;
 149         u16 vlan_id = vlan->vlan_id;
 150         struct vlan_info *vlan_info;
 151         struct vlan_group *grp;
 152         int err;
 153
 154         err = vlan_vid_add(real_dev, vlan->vlan_proto, vlan_id);
 155         if (err)
 156                 return err;
 157
 158         vlan_info = rtnl_dereference(real_dev->vlan_info);
 159         /* vlan_info should be there now. vlan_vid_add took care of it */
 160         BUG_ON(!vlan_info);
 161
 162         grp = &vlan_info->grp;
 163         if (grp->nr_vlan_devs == 0) {
 164                 err = vlan_gvrp_init_applicant(real_dev);
 165                 if (err < 0)
 166                         goto out_vid_del;
 167                 err = vlan_mvrp_init_applicant(real_dev);
 168                 if (err < 0)
 169                         goto out_uninit_gvrp;
 170         }
 171
 172         err = vlan_group_prealloc_vid(grp, vlan->vlan_proto, vlan_id);
 173         if (err < 0)
 174                 goto out_uninit_mvrp;
 175
 176         err = register_netdevice(dev);
 177         if (err < 0)
 178                 goto out_uninit_mvrp;
 179
 180         err = netdev_upper_dev_link(real_dev, dev, extack);
 181         if (err)
 182                 goto out_unregister_netdev;
 183
 184         vlan_stacked_transfer_operstate(real_dev, dev, vlan);
 185         linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
 186
 187         /* So, got the sucker initialized, now lets place
 188          * it into our local structure.
 189          */
 190         vlan_group_set_device(grp, vlan->vlan_proto, vlan_id, dev);
 191         grp->nr_vlan_devs++;
 192
 193         return 0;
 194
 195 out_unregister_netdev:
 196         unregister_netdevice(dev);
 197 out_uninit_mvrp:
 198         if (grp->nr_vlan_devs == 0)
 199                 vlan_mvrp_uninit_applicant(real_dev);
 200 out_uninit_gvrp:
 201         if (grp->nr_vlan_devs == 0)
 202                 vlan_gvrp_uninit_applicant(real_dev);
 203 out_vid_del:
 204         vlan_vid_del(real_dev, vlan->vlan_proto, vlan_id);
 205         return err;
 206 }
 207
 208 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
 209  *  Returns 0 if the device was created or a negative error code otherwise.
 210  */
 211 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
 212 {
 213         struct net_device *new_dev;
 214         struct vlan_dev_priv *vlan;
 215         struct net *net = dev_net(real_dev);
 216         struct vlan_net *vn = net_generic(net, vlan_net_id);
 217         char name[IFNAMSIZ];
 218         int err;
 219
 220         if (vlan_id >= VLAN_VID_MASK)
 221                 return -ERANGE;
 222
 223         err = vlan_check_real_dev(real_dev, htons(ETH_P_8021Q), vlan_id,
 224                                   NULL);
 225         if (err < 0)
 226                 return err;
 227
 228         /* Gotta set up the fields for the device. */
 229         switch (vn->name_type) {
 230         case VLAN_NAME_TYPE_RAW_PLUS_VID:
 231                 /* name will look like:  eth1.0005 */
 232                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
 233                 break;
 234         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
 235                 /* Put our vlan.VID in the name.
 236                  * Name will look like:  vlan5
 237                  */
 238                 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
 239                 break;
 240         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
 241                 /* Put our vlan.VID in the name.
 242                  * Name will look like:  eth0.5
 243                  */
 244                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
 245                 break;
 246         case VLAN_NAME_TYPE_PLUS_VID:
 247                 /* Put our vlan.VID in the name.
 248                  * Name will look like:  vlan0005
 249                  */
 250         default:
 251                 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
 252         }
 253
 254         new_dev = alloc_netdev(sizeof(struct vlan_dev_priv), name,
 255                                NET_NAME_UNKNOWN, vlan_setup);
 256
 257         if (new_dev == NULL)
 258                 return -ENOBUFS;
 259
 260         dev_net_set(new_dev, net);
 261         /* need 4 bytes for extra VLAN header info,
 262          * hope the underlying device can handle it.
 263          */
 264         new_dev->mtu = real_dev->mtu;
 265
 266         vlan = vlan_dev_priv(new_dev);
 267         vlan->vlan_proto = htons(ETH_P_8021Q);
 268         vlan->vlan_id = vlan_id;
 269         vlan->real_dev = real_dev;
 270         vlan->dent = NULL;
 271         vlan->flags = VLAN_FLAG_REORDER_HDR;
 272
 273         new_dev->rtnl_link_ops = &vlan_link_ops;
 274         err = register_vlan_dev(new_dev, NULL);
 275         if (err < 0)
 276                 goto out_free_newdev;
 277
 278         return 0;
 279
 280 out_free_newdev:
 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                         vlan_stacked_transfer_operstate(dev, vlandev,
 403                                                         vlan_dev_priv(vlandev));
 404                 break;
 405
 406         case NETDEV_CHANGEADDR:
 407                 /* Adjust unicast filters on underlying device */
 408                 vlan_group_for_each_dev(grp, i, vlandev) {
 409                         flgs = vlandev->flags;
 410                         if (!(flgs & IFF_UP))
 411                                 continue;
 412
 413                         vlan_sync_address(dev, vlandev);
 414                 }
 415                 break;
 416
 417         case NETDEV_CHANGEMTU:
 418                 vlan_group_for_each_dev(grp, i, vlandev) {
 419                         if (vlandev->mtu <= dev->mtu)
 420                                 continue;
 421
 422                         dev_set_mtu(vlandev, dev->mtu);
 423                 }
 424                 break;
 425
 426         case NETDEV_FEAT_CHANGE:
 427                 /* Propagate device features to underlying device */
 428                 vlan_group_for_each_dev(grp, i, vlandev)
 429                         vlan_transfer_features(dev, vlandev);
 430                 break;
 431
 432         case NETDEV_DOWN: {
 433                 struct net_device *tmp;
 434                 LIST_HEAD(close_list);
 435
 436                 /* Put all VLANs for this dev in the down state too.  */
 437                 vlan_group_for_each_dev(grp, i, vlandev) {
 438                         flgs = vlandev->flags;
 439                         if (!(flgs & IFF_UP))
 440                                 continue;
 441
 442                         vlan = vlan_dev_priv(vlandev);
 443                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 444                                 list_add(&vlandev->close_list, &close_list);
 445                 }
 446
 447                 dev_close_many(&close_list, false);
 448
 449                 list_for_each_entry_safe(vlandev, tmp, &close_list, close_list) {
 450                         vlan_stacked_transfer_operstate(dev, vlandev,
 451                                                         vlan_dev_priv(vlandev));
 452                         list_del_init(&vlandev->close_list);
 453                 }
 454                 list_del(&close_list);
 455                 break;
 456         }
 457         case NETDEV_UP:
 458                 /* Put all VLANs for this dev in the up state too.  */
 459                 vlan_group_for_each_dev(grp, i, vlandev) {
 460                         flgs = dev_get_flags(vlandev);
 461                         if (flgs & IFF_UP)
 462                                 continue;
 463
 464                         vlan = vlan_dev_priv(vlandev);
 465                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 466                                 dev_change_flags(vlandev, flgs | IFF_UP,
 467                                                  extack);
 468                         vlan_stacked_transfer_operstate(dev, vlandev, vlan);
 469                 }
 470                 break;
 471
 472         case NETDEV_UNREGISTER:
 473                 /* twiddle thumbs on netns device moves */
 474                 if (dev->reg_state != NETREG_UNREGISTERING)
 475                         break;
 476
 477                 vlan_group_for_each_dev(grp, i, vlandev) {
 478                         /* removal of last vid destroys vlan_info, abort
 479                          * afterwards */
 480                         if (vlan_info->nr_vids == 1)
 481                                 last = true;
 482
 483                         unregister_vlan_dev(vlandev, &list);
 484                         if (last)
 485                                 break;
 486                 }
 487                 unregister_netdevice_many(&list);
 488                 break;
 489
 490         case NETDEV_PRE_TYPE_CHANGE:
 491                 /* Forbid underlaying device to change its type. */
 492                 if (vlan_uses_dev(dev))
 493                         return NOTIFY_BAD;
 494                 break;
 495
 496         case NETDEV_NOTIFY_PEERS:
 497         case NETDEV_BONDING_FAILOVER:
 498         case NETDEV_RESEND_IGMP:
 499                 /* Propagate to vlan devices */
 500                 vlan_group_for_each_dev(grp, i, vlandev)
 501                         call_netdevice_notifiers(event, vlandev);
 502                 break;
 503
 504         case NETDEV_CVLAN_FILTER_PUSH_INFO:
 505                 err = vlan_filter_push_vids(vlan_info, htons(ETH_P_8021Q));
 506                 if (err)
 507                         return notifier_from_errno(err);
 508                 break;
 509
 510         case NETDEV_CVLAN_FILTER_DROP_INFO:
 511                 vlan_filter_drop_vids(vlan_info, htons(ETH_P_8021Q));
 512                 break;
 513
 514         case NETDEV_SVLAN_FILTER_PUSH_INFO:
 515                 err = vlan_filter_push_vids(vlan_info, htons(ETH_P_8021AD));
 516                 if (err)
 517                         return notifier_from_errno(err);
 518                 break;
 519
 520         case NETDEV_SVLAN_FILTER_DROP_INFO:
 521                 vlan_filter_drop_vids(vlan_info, htons(ETH_P_8021AD));
 522                 break;
 523         }
 524
 525 out:
 526         return NOTIFY_DONE;
 527 }
 528
 529 static struct notifier_block vlan_notifier_block __read_mostly = {
 530         .notifier_call = vlan_device_event,
 531 };
 532
 533 /*
 534  *      VLAN IOCTL handler.
 535  *      o execute requested action or pass command to the device driver
 536  *   arg is really a struct vlan_ioctl_args __user *.
 537  */
 538 static int vlan_ioctl_handler(struct net *net, void __user *arg)
 539 {
 540         int err;
 541         struct vlan_ioctl_args args;
 542         struct net_device *dev = NULL;
 543
 544         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 545                 return -EFAULT;
 546
 547         /* Null terminate this sucker, just in case. */
 548         args.device1[sizeof(args.device1) - 1] = 0;
 549         args.u.device2[sizeof(args.u.device2) - 1] = 0;
 550
 551         rtnl_lock();
 552
 553         switch (args.cmd) {
 554         case SET_VLAN_INGRESS_PRIORITY_CMD:
 555         case SET_VLAN_EGRESS_PRIORITY_CMD:
 556         case SET_VLAN_FLAG_CMD:
 557         case ADD_VLAN_CMD:
 558         case DEL_VLAN_CMD:
 559         case GET_VLAN_REALDEV_NAME_CMD:
 560         case GET_VLAN_VID_CMD:
 561                 err = -ENODEV;
 562                 dev = __dev_get_by_name(net, args.device1);
 563                 if (!dev)
 564                         goto out;
 565
 566                 err = -EINVAL;
 567                 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
 568                         goto out;
 569         }
 570
 571         switch (args.cmd) {
 572         case SET_VLAN_INGRESS_PRIORITY_CMD:
 573                 err = -EPERM;
 574                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 575                         break;
 576                 vlan_dev_set_ingress_priority(dev,
 577                                               args.u.skb_priority,
 578                                               args.vlan_qos);
 579                 err = 0;
 580                 break;
 581
 582         case SET_VLAN_EGRESS_PRIORITY_CMD:
 583                 err = -EPERM;
 584                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 585                         break;
 586                 err = vlan_dev_set_egress_priority(dev,
 587                                                    args.u.skb_priority,
 588                                                    args.vlan_qos);
 589                 break;
 590
 591         case SET_VLAN_FLAG_CMD:
 592                 err = -EPERM;
 593                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 594                         break;
 595                 err = vlan_dev_change_flags(dev,
 596                                             args.vlan_qos ? args.u.flag : 0,
 597                                             args.u.flag);
 598                 break;
 599
 600         case SET_VLAN_NAME_TYPE_CMD:
 601                 err = -EPERM;
 602                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 603                         break;
 604                 if (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 (!ns_capable(net->user_ns, 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 (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 625                         break;
 626                 unregister_vlan_dev(dev, NULL);
 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                 args.u.VID = vlan_dev_vlan_id(dev);
 641                 if (copy_to_user(arg, &args,
 642                                  sizeof(struct vlan_ioctl_args)))
 643                       err = -EFAULT;
 644                 break;
 645
 646         default:
 647                 err = -EOPNOTSUPP;
 648                 break;
 649         }
 650 out:
 651         rtnl_unlock();
 652         return err;
 653 }
 654
 655 static int __net_init vlan_init_net(struct net *net)
 656 {
 657         struct vlan_net *vn = net_generic(net, vlan_net_id);
 658         int err;
 659
 660         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
 661
 662         err = vlan_proc_init(net);
 663
 664         return err;
 665 }
 666
 667 static void __net_exit vlan_exit_net(struct net *net)
 668 {
 669         vlan_proc_cleanup(net);
 670 }
 671
 672 static struct pernet_operations vlan_net_ops = {
 673         .init = vlan_init_net,
 674         .exit = vlan_exit_net,
 675         .id   = &vlan_net_id,
 676         .size = sizeof(struct vlan_net),
 677 };
 678
 679 static int __init vlan_proto_init(void)
 680 {
 681         int err;
 682
 683         pr_info("%s v%s\n", vlan_fullname, vlan_version);
 684
 685         err = register_pernet_subsys(&vlan_net_ops);
 686         if (err < 0)
 687                 goto err0;
 688
 689         err = register_netdevice_notifier(&vlan_notifier_block);
 690         if (err < 0)
 691                 goto err2;
 692
 693         err = vlan_gvrp_init();
 694         if (err < 0)
 695                 goto err3;
 696
 697         err = vlan_mvrp_init();
 698         if (err < 0)
 699                 goto err4;
 700
 701         err = vlan_netlink_init();
 702         if (err < 0)
 703                 goto err5;
 704
 705         vlan_ioctl_set(vlan_ioctl_handler);
 706         return 0;
 707
 708 err5:
 709         vlan_mvrp_uninit();
 710 err4:
 711         vlan_gvrp_uninit();
 712 err3:
 713         unregister_netdevice_notifier(&vlan_notifier_block);
 714 err2:
 715         unregister_pernet_subsys(&vlan_net_ops);
 716 err0:
 717         return err;
 718 }
 719
 720 static void __exit vlan_cleanup_module(void)
 721 {
 722         vlan_ioctl_set(NULL);
 723
 724         vlan_netlink_fini();
 725
 726         unregister_netdevice_notifier(&vlan_notifier_block);
 727
 728         unregister_pernet_subsys(&vlan_net_ops);
 729         rcu_barrier(); /* Wait for completion of call_rcu()'s */
 730
 731         vlan_mvrp_uninit();
 732         vlan_gvrp_uninit();
 733 }
 734
 735 module_init(vlan_proto_init);
 736 module_exit(vlan_cleanup_module);
 737
 738 MODULE_LICENSE("GPL");
 739 MODULE_VERSION(DRV_VERSION);