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_ACCOUNT);
  71         if (array == NULL)
  72                 return -ENOBUFS;
  73
  74         /* paired with smp_rmb() in __vlan_group_get_device() */
  75         smp_wmb();
  76
  77         vg->vlan_devices_arrays[pidx][vidx] = array;
  78         return 0;
  79 }
  80
  81 static void vlan_stacked_transfer_operstate(const struct net_device *rootdev,
  82                                             struct net_device *dev,
  83                                             struct vlan_dev_priv *vlan)
  84 {
  85         if (!(vlan->flags & VLAN_FLAG_BRIDGE_BINDING))
  86                 netif_stacked_transfer_operstate(rootdev, dev);
  87 }
  88
  89 void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
  90 {
  91         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
  92         struct net_device *real_dev = vlan->real_dev;
  93         struct vlan_info *vlan_info;
  94         struct vlan_group *grp;
  95         u16 vlan_id = vlan->vlan_id;
  96
  97         ASSERT_RTNL();
  98
  99         vlan_info = rtnl_dereference(real_dev->vlan_info);
 100         BUG_ON(!vlan_info);
 101
 102         grp = &vlan_info->grp;
 103
 104         grp->nr_vlan_devs--;
 105
 106         if (vlan->flags & VLAN_FLAG_MVRP)
 107                 vlan_mvrp_request_leave(dev);
 108         if (vlan->flags & VLAN_FLAG_GVRP)
 109                 vlan_gvrp_request_leave(dev);
 110
 111         vlan_group_set_device(grp, vlan->vlan_proto, vlan_id, NULL);
 112
 113         netdev_upper_dev_unlink(real_dev, dev);
 114         /* Because unregister_netdevice_queue() makes sure at least one rcu
 115          * grace period is respected before device freeing,
 116          * we dont need to call synchronize_net() here.
 117          */
 118         unregister_netdevice_queue(dev, head);
 119
 120         if (grp->nr_vlan_devs == 0) {
 121                 vlan_mvrp_uninit_applicant(real_dev);
 122                 vlan_gvrp_uninit_applicant(real_dev);
 123         }
 124
 125         vlan_vid_del(real_dev, vlan->vlan_proto, vlan_id);
 126 }
 127
 128 int vlan_check_real_dev(struct net_device *real_dev,
 129                         __be16 protocol, u16 vlan_id,
 130                         struct netlink_ext_ack *extack)
 131 {
 132         const char *name = real_dev->name;
 133
 134         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
 135                 pr_info("VLANs not supported on %s\n", name);
 136                 NL_SET_ERR_MSG_MOD(extack, "VLANs not supported on device");
 137                 return -EOPNOTSUPP;
 138         }
 139
 140         if (vlan_find_dev(real_dev, protocol, vlan_id) != NULL) {
 141                 NL_SET_ERR_MSG_MOD(extack, "VLAN device already exists");
 142                 return -EEXIST;
 143         }
 144
 145         return 0;
 146 }
 147
 148 int register_vlan_dev(struct net_device *dev, struct netlink_ext_ack *extack)
 149 {
 150         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 151         struct net_device *real_dev = vlan->real_dev;
 152         u16 vlan_id = vlan->vlan_id;
 153         struct vlan_info *vlan_info;
 154         struct vlan_group *grp;
 155         int err;
 156
 157         err = vlan_vid_add(real_dev, vlan->vlan_proto, vlan_id);
 158         if (err)
 159                 return err;
 160
 161         vlan_info = rtnl_dereference(real_dev->vlan_info);
 162         /* vlan_info should be there now. vlan_vid_add took care of it */
 163         BUG_ON(!vlan_info);
 164
 165         grp = &vlan_info->grp;
 166         if (grp->nr_vlan_devs == 0) {
 167                 err = vlan_gvrp_init_applicant(real_dev);
 168                 if (err < 0)
 169                         goto out_vid_del;
 170                 err = vlan_mvrp_init_applicant(real_dev);
 171                 if (err < 0)
 172                         goto out_uninit_gvrp;
 173         }
 174
 175         err = vlan_group_prealloc_vid(grp, vlan->vlan_proto, vlan_id);
 176         if (err < 0)
 177                 goto out_uninit_mvrp;
 178
 179         err = register_netdevice(dev);
 180         if (err < 0)
 181                 goto out_uninit_mvrp;
 182
 183         err = netdev_upper_dev_link(real_dev, dev, extack);
 184         if (err)
 185                 goto out_unregister_netdev;
 186
 187         vlan_stacked_transfer_operstate(real_dev, dev, vlan);
 188         linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
 189
 190         /* So, got the sucker initialized, now lets place
 191          * it into our local structure.
 192          */
 193         vlan_group_set_device(grp, vlan->vlan_proto, vlan_id, dev);
 194         grp->nr_vlan_devs++;
 195
 196         return 0;
 197
 198 out_unregister_netdev:
 199         unregister_netdevice(dev);
 200 out_uninit_mvrp:
 201         if (grp->nr_vlan_devs == 0)
 202                 vlan_mvrp_uninit_applicant(real_dev);
 203 out_uninit_gvrp:
 204         if (grp->nr_vlan_devs == 0)
 205                 vlan_gvrp_uninit_applicant(real_dev);
 206 out_vid_del:
 207         vlan_vid_del(real_dev, vlan->vlan_proto, vlan_id);
 208         return err;
 209 }
 210
 211 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
 212  *  Returns 0 if the device was created or a negative error code otherwise.
 213  */
 214 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
 215 {
 216         struct net_device *new_dev;
 217         struct vlan_dev_priv *vlan;
 218         struct net *net = dev_net(real_dev);
 219         struct vlan_net *vn = net_generic(net, vlan_net_id);
 220         char name[IFNAMSIZ];
 221         int err;
 222
 223         if (vlan_id >= VLAN_VID_MASK)
 224                 return -ERANGE;
 225
 226         err = vlan_check_real_dev(real_dev, htons(ETH_P_8021Q), vlan_id,
 227                                   NULL);
 228         if (err < 0)
 229                 return err;
 230
 231         /* Gotta set up the fields for the device. */
 232         switch (vn->name_type) {
 233         case VLAN_NAME_TYPE_RAW_PLUS_VID:
 234                 /* name will look like:  eth1.0005 */
 235                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
 236                 break;
 237         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
 238                 /* Put our vlan.VID in the name.
 239                  * Name will look like:  vlan5
 240                  */
 241                 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
 242                 break;
 243         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
 244                 /* Put our vlan.VID in the name.
 245                  * Name will look like:  eth0.5
 246                  */
 247                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
 248                 break;
 249         case VLAN_NAME_TYPE_PLUS_VID:
 250                 /* Put our vlan.VID in the name.
 251                  * Name will look like:  vlan0005
 252                  */
 253         default:
 254                 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
 255         }
 256
 257         new_dev = alloc_netdev(sizeof(struct vlan_dev_priv), name,
 258                                NET_NAME_UNKNOWN, vlan_setup);
 259
 260         if (new_dev == NULL)
 261                 return -ENOBUFS;
 262
 263         dev_net_set(new_dev, net);
 264         /* need 4 bytes for extra VLAN header info,
 265          * hope the underlying device can handle it.
 266          */
 267         new_dev->mtu = real_dev->mtu;
 268
 269         vlan = vlan_dev_priv(new_dev);
 270         vlan->vlan_proto = htons(ETH_P_8021Q);
 271         vlan->vlan_id = vlan_id;
 272         vlan->real_dev = real_dev;
 273         vlan->dent = NULL;
 274         vlan->flags = VLAN_FLAG_REORDER_HDR;
 275
 276         new_dev->rtnl_link_ops = &vlan_link_ops;
 277         err = register_vlan_dev(new_dev, NULL);
 278         if (err < 0)
 279                 goto out_free_newdev;
 280
 281         return 0;
 282
 283 out_free_newdev:
 284         free_netdev(new_dev);
 285         return err;
 286 }
 287
 288 static void vlan_sync_address(struct net_device *dev,
 289                               struct net_device *vlandev)
 290 {
 291         struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
 292
 293         /* May be called without an actual change */
 294         if (ether_addr_equal(vlan->real_dev_addr, dev->dev_addr))
 295                 return;
 296
 297         /* vlan continues to inherit address of lower device */
 298         if (vlan_dev_inherit_address(vlandev, dev))
 299                 goto out;
 300
 301         /* vlan address was different from the old address and is equal to
 302          * the new address */
 303         if (!ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) &&
 304             ether_addr_equal(vlandev->dev_addr, dev->dev_addr))
 305                 dev_uc_del(dev, vlandev->dev_addr);
 306
 307         /* vlan address was equal to the old address and is different from
 308          * the new address */
 309         if (ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) &&
 310             !ether_addr_equal(vlandev->dev_addr, dev->dev_addr))
 311                 dev_uc_add(dev, vlandev->dev_addr);
 312
 313 out:
 314         ether_addr_copy(vlan->real_dev_addr, dev->dev_addr);
 315 }
 316
 317 static void vlan_transfer_features(struct net_device *dev,
 318                                    struct net_device *vlandev)
 319 {
 320         struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
 321
 322         vlandev->gso_max_size = dev->gso_max_size;
 323         vlandev->gso_max_segs = dev->gso_max_segs;
 324
 325         if (vlan_hw_offload_capable(dev->features, vlan->vlan_proto))
 326                 vlandev->hard_header_len = dev->hard_header_len;
 327         else
 328                 vlandev->hard_header_len = dev->hard_header_len + VLAN_HLEN;
 329
 330 #if IS_ENABLED(CONFIG_FCOE)
 331         vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
 332 #endif
 333
 334         vlandev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
 335         vlandev->priv_flags |= (vlan->real_dev->priv_flags & IFF_XMIT_DST_RELEASE);
 336         vlandev->hw_enc_features = vlan_tnl_features(vlan->real_dev);
 337
 338         netdev_update_features(vlandev);
 339 }
 340
 341 static int __vlan_device_event(struct net_device *dev, unsigned long event)
 342 {
 343         int err = 0;
 344
 345         switch (event) {
 346         case NETDEV_CHANGENAME:
 347                 vlan_proc_rem_dev(dev);
 348                 err = vlan_proc_add_dev(dev);
 349                 break;
 350         case NETDEV_REGISTER:
 351                 err = vlan_proc_add_dev(dev);
 352                 break;
 353         case NETDEV_UNREGISTER:
 354                 vlan_proc_rem_dev(dev);
 355                 break;
 356         }
 357
 358         return err;
 359 }
 360
 361 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
 362                              void *ptr)
 363 {
 364         struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr);
 365         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 366         struct vlan_group *grp;
 367         struct vlan_info *vlan_info;
 368         int i, flgs;
 369         struct net_device *vlandev;
 370         struct vlan_dev_priv *vlan;
 371         bool last = false;
 372         LIST_HEAD(list);
 373         int err;
 374
 375         if (is_vlan_dev(dev)) {
 376                 int err = __vlan_device_event(dev, event);
 377
 378                 if (err)
 379                         return notifier_from_errno(err);
 380         }
 381
 382         if ((event == NETDEV_UP) &&
 383             (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)) {
 384                 pr_info("adding VLAN 0 to HW filter on device %s\n",
 385                         dev->name);
 386                 vlan_vid_add(dev, htons(ETH_P_8021Q), 0);
 387         }
 388         if (event == NETDEV_DOWN &&
 389             (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER))
 390                 vlan_vid_del(dev, htons(ETH_P_8021Q), 0);
 391
 392         vlan_info = rtnl_dereference(dev->vlan_info);
 393         if (!vlan_info)
 394                 goto out;
 395         grp = &vlan_info->grp;
 396
 397         /* It is OK that we do not hold the group lock right now,
 398          * as we run under the RTNL lock.
 399          */
 400
 401         switch (event) {
 402         case NETDEV_CHANGE:
 403                 /* Propagate real device state to vlan devices */
 404                 vlan_group_for_each_dev(grp, i, vlandev)
 405                         vlan_stacked_transfer_operstate(dev, vlandev,
 406                                                         vlan_dev_priv(vlandev));
 407                 break;
 408
 409         case NETDEV_CHANGEADDR:
 410                 /* Adjust unicast filters on underlying device */
 411                 vlan_group_for_each_dev(grp, i, vlandev) {
 412                         flgs = vlandev->flags;
 413                         if (!(flgs & IFF_UP))
 414                                 continue;
 415
 416                         vlan_sync_address(dev, vlandev);
 417                 }
 418                 break;
 419
 420         case NETDEV_CHANGEMTU:
 421                 vlan_group_for_each_dev(grp, i, vlandev) {
 422                         if (vlandev->mtu <= dev->mtu)
 423                                 continue;
 424
 425                         dev_set_mtu(vlandev, dev->mtu);
 426                 }
 427                 break;
 428
 429         case NETDEV_FEAT_CHANGE:
 430                 /* Propagate device features to underlying device */
 431                 vlan_group_for_each_dev(grp, i, vlandev)
 432                         vlan_transfer_features(dev, vlandev);
 433                 break;
 434
 435         case NETDEV_DOWN: {
 436                 struct net_device *tmp;
 437                 LIST_HEAD(close_list);
 438
 439                 /* Put all VLANs for this dev in the down state too.  */
 440                 vlan_group_for_each_dev(grp, i, vlandev) {
 441                         flgs = vlandev->flags;
 442                         if (!(flgs & IFF_UP))
 443                                 continue;
 444
 445                         vlan = vlan_dev_priv(vlandev);
 446                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 447                                 list_add(&vlandev->close_list, &close_list);
 448                 }
 449
 450                 dev_close_many(&close_list, false);
 451
 452                 list_for_each_entry_safe(vlandev, tmp, &close_list, close_list) {
 453                         vlan_stacked_transfer_operstate(dev, vlandev,
 454                                                         vlan_dev_priv(vlandev));
 455                         list_del_init(&vlandev->close_list);
 456                 }
 457                 list_del(&close_list);
 458                 break;
 459         }
 460         case NETDEV_UP:
 461                 /* Put all VLANs for this dev in the up state too.  */
 462                 vlan_group_for_each_dev(grp, i, vlandev) {
 463                         flgs = dev_get_flags(vlandev);
 464                         if (flgs & IFF_UP)
 465                                 continue;
 466
 467                         vlan = vlan_dev_priv(vlandev);
 468                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 469                                 dev_change_flags(vlandev, flgs | IFF_UP,
 470                                                  extack);
 471                         vlan_stacked_transfer_operstate(dev, vlandev, vlan);
 472                 }
 473                 break;
 474
 475         case NETDEV_UNREGISTER:
 476                 /* twiddle thumbs on netns device moves */
 477                 if (dev->reg_state != NETREG_UNREGISTERING)
 478                         break;
 479
 480                 vlan_group_for_each_dev(grp, i, vlandev) {
 481                         /* removal of last vid destroys vlan_info, abort
 482                          * afterwards */
 483                         if (vlan_info->nr_vids == 1)
 484                                 last = true;
 485
 486                         unregister_vlan_dev(vlandev, &list);
 487                         if (last)
 488                                 break;
 489                 }
 490                 unregister_netdevice_many(&list);
 491                 break;
 492
 493         case NETDEV_PRE_TYPE_CHANGE:
 494                 /* Forbid underlaying device to change its type. */
 495                 if (vlan_uses_dev(dev))
 496                         return NOTIFY_BAD;
 497                 break;
 498
 499         case NETDEV_NOTIFY_PEERS:
 500         case NETDEV_BONDING_FAILOVER:
 501         case NETDEV_RESEND_IGMP:
 502                 /* Propagate to vlan devices */
 503                 vlan_group_for_each_dev(grp, i, vlandev)
 504                         call_netdevice_notifiers(event, vlandev);
 505                 break;
 506
 507         case NETDEV_CVLAN_FILTER_PUSH_INFO:
 508                 err = vlan_filter_push_vids(vlan_info, htons(ETH_P_8021Q));
 509                 if (err)
 510                         return notifier_from_errno(err);
 511                 break;
 512
 513         case NETDEV_CVLAN_FILTER_DROP_INFO:
 514                 vlan_filter_drop_vids(vlan_info, htons(ETH_P_8021Q));
 515                 break;
 516
 517         case NETDEV_SVLAN_FILTER_PUSH_INFO:
 518                 err = vlan_filter_push_vids(vlan_info, htons(ETH_P_8021AD));
 519                 if (err)
 520                         return notifier_from_errno(err);
 521                 break;
 522
 523         case NETDEV_SVLAN_FILTER_DROP_INFO:
 524                 vlan_filter_drop_vids(vlan_info, htons(ETH_P_8021AD));
 525                 break;
 526         }
 527
 528 out:
 529         return NOTIFY_DONE;
 530 }
 531
 532 static struct notifier_block vlan_notifier_block __read_mostly = {
 533         .notifier_call = vlan_device_event,
 534 };
 535
 536 /*
 537  *      VLAN IOCTL handler.
 538  *      o execute requested action or pass command to the device driver
 539  *   arg is really a struct vlan_ioctl_args __user *.
 540  */
 541 static int vlan_ioctl_handler(struct net *net, void __user *arg)
 542 {
 543         int err;
 544         struct vlan_ioctl_args args;
 545         struct net_device *dev = NULL;
 546
 547         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 548                 return -EFAULT;
 549
 550         /* Null terminate this sucker, just in case. */
 551         args.device1[sizeof(args.device1) - 1] = 0;
 552         args.u.device2[sizeof(args.u.device2) - 1] = 0;
 553
 554         rtnl_lock();
 555
 556         switch (args.cmd) {
 557         case SET_VLAN_INGRESS_PRIORITY_CMD:
 558         case SET_VLAN_EGRESS_PRIORITY_CMD:
 559         case SET_VLAN_FLAG_CMD:
 560         case ADD_VLAN_CMD:
 561         case DEL_VLAN_CMD:
 562         case GET_VLAN_REALDEV_NAME_CMD:
 563         case GET_VLAN_VID_CMD:
 564                 err = -ENODEV;
 565                 dev = __dev_get_by_name(net, args.device1);
 566                 if (!dev)
 567                         goto out;
 568
 569                 err = -EINVAL;
 570                 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
 571                         goto out;
 572         }
 573
 574         switch (args.cmd) {
 575         case SET_VLAN_INGRESS_PRIORITY_CMD:
 576                 err = -EPERM;
 577                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 578                         break;
 579                 vlan_dev_set_ingress_priority(dev,
 580                                               args.u.skb_priority,
 581                                               args.vlan_qos);
 582                 err = 0;
 583                 break;
 584
 585         case SET_VLAN_EGRESS_PRIORITY_CMD:
 586                 err = -EPERM;
 587                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 588                         break;
 589                 err = vlan_dev_set_egress_priority(dev,
 590                                                    args.u.skb_priority,
 591                                                    args.vlan_qos);
 592                 break;
 593
 594         case SET_VLAN_FLAG_CMD:
 595                 err = -EPERM;
 596                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 597                         break;
 598                 err = vlan_dev_change_flags(dev,
 599                                             args.vlan_qos ? args.u.flag : 0,
 600                                             args.u.flag);
 601                 break;
 602
 603         case SET_VLAN_NAME_TYPE_CMD:
 604                 err = -EPERM;
 605                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 606                         break;
 607                 if (args.u.name_type < VLAN_NAME_TYPE_HIGHEST) {
 608                         struct vlan_net *vn;
 609
 610                         vn = net_generic(net, vlan_net_id);
 611                         vn->name_type = args.u.name_type;
 612                         err = 0;
 613                 } else {
 614                         err = -EINVAL;
 615                 }
 616                 break;
 617
 618         case ADD_VLAN_CMD:
 619                 err = -EPERM;
 620                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 621                         break;
 622                 err = register_vlan_device(dev, args.u.VID);
 623                 break;
 624
 625         case DEL_VLAN_CMD:
 626                 err = -EPERM;
 627                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 628                         break;
 629                 unregister_vlan_dev(dev, NULL);
 630                 err = 0;
 631                 break;
 632
 633         case GET_VLAN_REALDEV_NAME_CMD:
 634                 err = 0;
 635                 vlan_dev_get_realdev_name(dev, args.u.device2,
 636                                           sizeof(args.u.device2));
 637                 if (copy_to_user(arg, &args,
 638                                  sizeof(struct vlan_ioctl_args)))
 639                         err = -EFAULT;
 640                 break;
 641
 642         case GET_VLAN_VID_CMD:
 643                 err = 0;
 644                 args.u.VID = vlan_dev_vlan_id(dev);
 645                 if (copy_to_user(arg, &args,
 646                                  sizeof(struct vlan_ioctl_args)))
 647                       err = -EFAULT;
 648                 break;
 649
 650         default:
 651                 err = -EOPNOTSUPP;
 652                 break;
 653         }
 654 out:
 655         rtnl_unlock();
 656         return err;
 657 }
 658
 659 static int __net_init vlan_init_net(struct net *net)
 660 {
 661         struct vlan_net *vn = net_generic(net, vlan_net_id);
 662         int err;
 663
 664         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
 665
 666         err = vlan_proc_init(net);
 667
 668         return err;
 669 }
 670
 671 static void __net_exit vlan_exit_net(struct net *net)
 672 {
 673         vlan_proc_cleanup(net);
 674 }
 675
 676 static struct pernet_operations vlan_net_ops = {
 677         .init = vlan_init_net,
 678         .exit = vlan_exit_net,
 679         .id   = &vlan_net_id,
 680         .size = sizeof(struct vlan_net),
 681 };
 682
 683 static int __init vlan_proto_init(void)
 684 {
 685         int err;
 686
 687         pr_info("%s v%s\n", vlan_fullname, vlan_version);
 688
 689         err = register_pernet_subsys(&vlan_net_ops);
 690         if (err < 0)
 691                 goto err0;
 692
 693         err = register_netdevice_notifier(&vlan_notifier_block);
 694         if (err < 0)
 695                 goto err2;
 696
 697         err = vlan_gvrp_init();
 698         if (err < 0)
 699                 goto err3;
 700
 701         err = vlan_mvrp_init();
 702         if (err < 0)
 703                 goto err4;
 704
 705         err = vlan_netlink_init();
 706         if (err < 0)
 707                 goto err5;
 708
 709         vlan_ioctl_set(vlan_ioctl_handler);
 710         return 0;
 711
 712 err5:
 713         vlan_mvrp_uninit();
 714 err4:
 715         vlan_gvrp_uninit();
 716 err3:
 717         unregister_netdevice_notifier(&vlan_notifier_block);
 718 err2:
 719         unregister_pernet_subsys(&vlan_net_ops);
 720 err0:
 721         return err;
 722 }
 723
 724 static void __exit vlan_cleanup_module(void)
 725 {
 726         vlan_ioctl_set(NULL);
 727
 728         vlan_netlink_fini();
 729
 730         unregister_netdevice_notifier(&vlan_notifier_block);
 731
 732         unregister_pernet_subsys(&vlan_net_ops);
 733         rcu_barrier(); /* Wait for completion of call_rcu()'s */
 734
 735         vlan_mvrp_uninit();
 736         vlan_gvrp_uninit();
 737 }
 738
 739 module_init(vlan_proto_init);
 740 module_exit(vlan_cleanup_module);
 741
 742 MODULE_LICENSE("GPL");
 743 MODULE_VERSION(DRV_VERSION);