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         /* Get rid of the vlan's reference to real_dev */
 128         dev_put(real_dev);
 129 }
 130
 131 int vlan_check_real_dev(struct net_device *real_dev,
 132                         __be16 protocol, u16 vlan_id,
 133                         struct netlink_ext_ack *extack)
 134 {
 135         const char *name = real_dev->name;
 136
 137         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
 138                 pr_info("VLANs not supported on %s\n", name);
 139                 NL_SET_ERR_MSG_MOD(extack, "VLANs not supported on device");
 140                 return -EOPNOTSUPP;
 141         }
 142
 143         if (vlan_find_dev(real_dev, protocol, vlan_id) != NULL) {
 144                 NL_SET_ERR_MSG_MOD(extack, "VLAN device already exists");
 145                 return -EEXIST;
 146         }
 147
 148         return 0;
 149 }
 150
 151 int register_vlan_dev(struct net_device *dev, struct netlink_ext_ack *extack)
 152 {
 153         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 154         struct net_device *real_dev = vlan->real_dev;
 155         u16 vlan_id = vlan->vlan_id;
 156         struct vlan_info *vlan_info;
 157         struct vlan_group *grp;
 158         int err;
 159
 160         err = vlan_vid_add(real_dev, vlan->vlan_proto, vlan_id);
 161         if (err)
 162                 return err;
 163
 164         vlan_info = rtnl_dereference(real_dev->vlan_info);
 165         /* vlan_info should be there now. vlan_vid_add took care of it */
 166         BUG_ON(!vlan_info);
 167
 168         grp = &vlan_info->grp;
 169         if (grp->nr_vlan_devs == 0) {
 170                 err = vlan_gvrp_init_applicant(real_dev);
 171                 if (err < 0)
 172                         goto out_vid_del;
 173                 err = vlan_mvrp_init_applicant(real_dev);
 174                 if (err < 0)
 175                         goto out_uninit_gvrp;
 176         }
 177
 178         err = vlan_group_prealloc_vid(grp, vlan->vlan_proto, vlan_id);
 179         if (err < 0)
 180                 goto out_uninit_mvrp;
 181
 182         err = register_netdevice(dev);
 183         if (err < 0)
 184                 goto out_uninit_mvrp;
 185
 186         err = netdev_upper_dev_link(real_dev, dev, extack);
 187         if (err)
 188                 goto out_unregister_netdev;
 189
 190         /* Account for reference in struct vlan_dev_priv */
 191         dev_hold(real_dev);
 192
 193         vlan_stacked_transfer_operstate(real_dev, dev, vlan);
 194         linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
 195
 196         /* So, got the sucker initialized, now lets place
 197          * it into our local structure.
 198          */
 199         vlan_group_set_device(grp, vlan->vlan_proto, vlan_id, dev);
 200         grp->nr_vlan_devs++;
 201
 202         return 0;
 203
 204 out_unregister_netdev:
 205         unregister_netdevice(dev);
 206 out_uninit_mvrp:
 207         if (grp->nr_vlan_devs == 0)
 208                 vlan_mvrp_uninit_applicant(real_dev);
 209 out_uninit_gvrp:
 210         if (grp->nr_vlan_devs == 0)
 211                 vlan_gvrp_uninit_applicant(real_dev);
 212 out_vid_del:
 213         vlan_vid_del(real_dev, vlan->vlan_proto, vlan_id);
 214         return err;
 215 }
 216
 217 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
 218  *  Returns 0 if the device was created or a negative error code otherwise.
 219  */
 220 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
 221 {
 222         struct net_device *new_dev;
 223         struct vlan_dev_priv *vlan;
 224         struct net *net = dev_net(real_dev);
 225         struct vlan_net *vn = net_generic(net, vlan_net_id);
 226         char name[IFNAMSIZ];
 227         int err;
 228
 229         if (vlan_id >= VLAN_VID_MASK)
 230                 return -ERANGE;
 231
 232         err = vlan_check_real_dev(real_dev, htons(ETH_P_8021Q), vlan_id,
 233                                   NULL);
 234         if (err < 0)
 235                 return err;
 236
 237         /* Gotta set up the fields for the device. */
 238         switch (vn->name_type) {
 239         case VLAN_NAME_TYPE_RAW_PLUS_VID:
 240                 /* name will look like:  eth1.0005 */
 241                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
 242                 break;
 243         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
 244                 /* Put our vlan.VID in the name.
 245                  * Name will look like:  vlan5
 246                  */
 247                 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
 248                 break;
 249         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
 250                 /* Put our vlan.VID in the name.
 251                  * Name will look like:  eth0.5
 252                  */
 253                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
 254                 break;
 255         case VLAN_NAME_TYPE_PLUS_VID:
 256                 /* Put our vlan.VID in the name.
 257                  * Name will look like:  vlan0005
 258                  */
 259         default:
 260                 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
 261         }
 262
 263         new_dev = alloc_netdev(sizeof(struct vlan_dev_priv), name,
 264                                NET_NAME_UNKNOWN, vlan_setup);
 265
 266         if (new_dev == NULL)
 267                 return -ENOBUFS;
 268
 269         dev_net_set(new_dev, net);
 270         /* need 4 bytes for extra VLAN header info,
 271          * hope the underlying device can handle it.
 272          */
 273         new_dev->mtu = real_dev->mtu;
 274
 275         vlan = vlan_dev_priv(new_dev);
 276         vlan->vlan_proto = htons(ETH_P_8021Q);
 277         vlan->vlan_id = vlan_id;
 278         vlan->real_dev = real_dev;
 279         vlan->dent = NULL;
 280         vlan->flags = VLAN_FLAG_REORDER_HDR;
 281
 282         new_dev->rtnl_link_ops = &vlan_link_ops;
 283         err = register_vlan_dev(new_dev, NULL);
 284         if (err < 0)
 285                 goto out_free_newdev;
 286
 287         return 0;
 288
 289 out_free_newdev:
 290         free_netdev(new_dev);
 291         return err;
 292 }
 293
 294 static void vlan_sync_address(struct net_device *dev,
 295                               struct net_device *vlandev)
 296 {
 297         struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
 298
 299         /* May be called without an actual change */
 300         if (ether_addr_equal(vlan->real_dev_addr, dev->dev_addr))
 301                 return;
 302
 303         /* vlan continues to inherit address of lower device */
 304         if (vlan_dev_inherit_address(vlandev, dev))
 305                 goto out;
 306
 307         /* vlan address was different from the old address and is equal to
 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_del(dev, vlandev->dev_addr);
 312
 313         /* vlan address was equal to the old address and is different from
 314          * the new address */
 315         if (ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) &&
 316             !ether_addr_equal(vlandev->dev_addr, dev->dev_addr))
 317                 dev_uc_add(dev, vlandev->dev_addr);
 318
 319 out:
 320         ether_addr_copy(vlan->real_dev_addr, dev->dev_addr);
 321 }
 322
 323 static void vlan_transfer_features(struct net_device *dev,
 324                                    struct net_device *vlandev)
 325 {
 326         struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
 327
 328         vlandev->gso_max_size = dev->gso_max_size;
 329         vlandev->gso_max_segs = dev->gso_max_segs;
 330
 331         if (vlan_hw_offload_capable(dev->features, vlan->vlan_proto))
 332                 vlandev->hard_header_len = dev->hard_header_len;
 333         else
 334                 vlandev->hard_header_len = dev->hard_header_len + VLAN_HLEN;
 335
 336 #if IS_ENABLED(CONFIG_FCOE)
 337         vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
 338 #endif
 339
 340         vlandev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
 341         vlandev->priv_flags |= (vlan->real_dev->priv_flags & IFF_XMIT_DST_RELEASE);
 342         vlandev->hw_enc_features = vlan_tnl_features(vlan->real_dev);
 343
 344         netdev_update_features(vlandev);
 345 }
 346
 347 static int __vlan_device_event(struct net_device *dev, unsigned long event)
 348 {
 349         int err = 0;
 350
 351         switch (event) {
 352         case NETDEV_CHANGENAME:
 353                 vlan_proc_rem_dev(dev);
 354                 err = vlan_proc_add_dev(dev);
 355                 break;
 356         case NETDEV_REGISTER:
 357                 err = vlan_proc_add_dev(dev);
 358                 break;
 359         case NETDEV_UNREGISTER:
 360                 vlan_proc_rem_dev(dev);
 361                 break;
 362         }
 363
 364         return err;
 365 }
 366
 367 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
 368                              void *ptr)
 369 {
 370         struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr);
 371         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 372         struct vlan_group *grp;
 373         struct vlan_info *vlan_info;
 374         int i, flgs;
 375         struct net_device *vlandev;
 376         struct vlan_dev_priv *vlan;
 377         bool last = false;
 378         LIST_HEAD(list);
 379         int err;
 380
 381         if (is_vlan_dev(dev)) {
 382                 int err = __vlan_device_event(dev, event);
 383
 384                 if (err)
 385                         return notifier_from_errno(err);
 386         }
 387
 388         if ((event == NETDEV_UP) &&
 389             (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)) {
 390                 pr_info("adding VLAN 0 to HW filter on device %s\n",
 391                         dev->name);
 392                 vlan_vid_add(dev, htons(ETH_P_8021Q), 0);
 393         }
 394         if (event == NETDEV_DOWN &&
 395             (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER))
 396                 vlan_vid_del(dev, htons(ETH_P_8021Q), 0);
 397
 398         vlan_info = rtnl_dereference(dev->vlan_info);
 399         if (!vlan_info)
 400                 goto out;
 401         grp = &vlan_info->grp;
 402
 403         /* It is OK that we do not hold the group lock right now,
 404          * as we run under the RTNL lock.
 405          */
 406
 407         switch (event) {
 408         case NETDEV_CHANGE:
 409                 /* Propagate real device state to vlan devices */
 410                 vlan_group_for_each_dev(grp, i, vlandev)
 411                         vlan_stacked_transfer_operstate(dev, vlandev,
 412                                                         vlan_dev_priv(vlandev));
 413                 break;
 414
 415         case NETDEV_CHANGEADDR:
 416                 /* Adjust unicast filters on underlying device */
 417                 vlan_group_for_each_dev(grp, i, vlandev) {
 418                         flgs = vlandev->flags;
 419                         if (!(flgs & IFF_UP))
 420                                 continue;
 421
 422                         vlan_sync_address(dev, vlandev);
 423                 }
 424                 break;
 425
 426         case NETDEV_CHANGEMTU:
 427                 vlan_group_for_each_dev(grp, i, vlandev) {
 428                         if (vlandev->mtu <= dev->mtu)
 429                                 continue;
 430
 431                         dev_set_mtu(vlandev, dev->mtu);
 432                 }
 433                 break;
 434
 435         case NETDEV_FEAT_CHANGE:
 436                 /* Propagate device features to underlying device */
 437                 vlan_group_for_each_dev(grp, i, vlandev)
 438                         vlan_transfer_features(dev, vlandev);
 439                 break;
 440
 441         case NETDEV_DOWN: {
 442                 struct net_device *tmp;
 443                 LIST_HEAD(close_list);
 444
 445                 /* Put all VLANs for this dev in the down state too.  */
 446                 vlan_group_for_each_dev(grp, i, vlandev) {
 447                         flgs = vlandev->flags;
 448                         if (!(flgs & IFF_UP))
 449                                 continue;
 450
 451                         vlan = vlan_dev_priv(vlandev);
 452                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 453                                 list_add(&vlandev->close_list, &close_list);
 454                 }
 455
 456                 dev_close_many(&close_list, false);
 457
 458                 list_for_each_entry_safe(vlandev, tmp, &close_list, close_list) {
 459                         vlan_stacked_transfer_operstate(dev, vlandev,
 460                                                         vlan_dev_priv(vlandev));
 461                         list_del_init(&vlandev->close_list);
 462                 }
 463                 list_del(&close_list);
 464                 break;
 465         }
 466         case NETDEV_UP:
 467                 /* Put all VLANs for this dev in the up state too.  */
 468                 vlan_group_for_each_dev(grp, i, vlandev) {
 469                         flgs = dev_get_flags(vlandev);
 470                         if (flgs & IFF_UP)
 471                                 continue;
 472
 473                         vlan = vlan_dev_priv(vlandev);
 474                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 475                                 dev_change_flags(vlandev, flgs | IFF_UP,
 476                                                  extack);
 477                         vlan_stacked_transfer_operstate(dev, vlandev, vlan);
 478                 }
 479                 break;
 480
 481         case NETDEV_UNREGISTER:
 482                 /* twiddle thumbs on netns device moves */
 483                 if (dev->reg_state != NETREG_UNREGISTERING)
 484                         break;
 485
 486                 vlan_group_for_each_dev(grp, i, vlandev) {
 487                         /* removal of last vid destroys vlan_info, abort
 488                          * afterwards */
 489                         if (vlan_info->nr_vids == 1)
 490                                 last = true;
 491
 492                         unregister_vlan_dev(vlandev, &list);
 493                         if (last)
 494                                 break;
 495                 }
 496                 unregister_netdevice_many(&list);
 497                 break;
 498
 499         case NETDEV_PRE_TYPE_CHANGE:
 500                 /* Forbid underlaying device to change its type. */
 501                 if (vlan_uses_dev(dev))
 502                         return NOTIFY_BAD;
 503                 break;
 504
 505         case NETDEV_NOTIFY_PEERS:
 506         case NETDEV_BONDING_FAILOVER:
 507         case NETDEV_RESEND_IGMP:
 508                 /* Propagate to vlan devices */
 509                 vlan_group_for_each_dev(grp, i, vlandev)
 510                         call_netdevice_notifiers(event, vlandev);
 511                 break;
 512
 513         case NETDEV_CVLAN_FILTER_PUSH_INFO:
 514                 err = vlan_filter_push_vids(vlan_info, htons(ETH_P_8021Q));
 515                 if (err)
 516                         return notifier_from_errno(err);
 517                 break;
 518
 519         case NETDEV_CVLAN_FILTER_DROP_INFO:
 520                 vlan_filter_drop_vids(vlan_info, htons(ETH_P_8021Q));
 521                 break;
 522
 523         case NETDEV_SVLAN_FILTER_PUSH_INFO:
 524                 err = vlan_filter_push_vids(vlan_info, htons(ETH_P_8021AD));
 525                 if (err)
 526                         return notifier_from_errno(err);
 527                 break;
 528
 529         case NETDEV_SVLAN_FILTER_DROP_INFO:
 530                 vlan_filter_drop_vids(vlan_info, htons(ETH_P_8021AD));
 531                 break;
 532         }
 533
 534 out:
 535         return NOTIFY_DONE;
 536 }
 537
 538 static struct notifier_block vlan_notifier_block __read_mostly = {
 539         .notifier_call = vlan_device_event,
 540 };
 541
 542 /*
 543  *      VLAN IOCTL handler.
 544  *      o execute requested action or pass command to the device driver
 545  *   arg is really a struct vlan_ioctl_args __user *.
 546  */
 547 static int vlan_ioctl_handler(struct net *net, void __user *arg)
 548 {
 549         int err;
 550         struct vlan_ioctl_args args;
 551         struct net_device *dev = NULL;
 552
 553         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 554                 return -EFAULT;
 555
 556         /* Null terminate this sucker, just in case. */
 557         args.device1[sizeof(args.device1) - 1] = 0;
 558         args.u.device2[sizeof(args.u.device2) - 1] = 0;
 559
 560         rtnl_lock();
 561
 562         switch (args.cmd) {
 563         case SET_VLAN_INGRESS_PRIORITY_CMD:
 564         case SET_VLAN_EGRESS_PRIORITY_CMD:
 565         case SET_VLAN_FLAG_CMD:
 566         case ADD_VLAN_CMD:
 567         case DEL_VLAN_CMD:
 568         case GET_VLAN_REALDEV_NAME_CMD:
 569         case GET_VLAN_VID_CMD:
 570                 err = -ENODEV;
 571                 dev = __dev_get_by_name(net, args.device1);
 572                 if (!dev)
 573                         goto out;
 574
 575                 err = -EINVAL;
 576                 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
 577                         goto out;
 578         }
 579
 580         switch (args.cmd) {
 581         case SET_VLAN_INGRESS_PRIORITY_CMD:
 582                 err = -EPERM;
 583                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 584                         break;
 585                 vlan_dev_set_ingress_priority(dev,
 586                                               args.u.skb_priority,
 587                                               args.vlan_qos);
 588                 err = 0;
 589                 break;
 590
 591         case SET_VLAN_EGRESS_PRIORITY_CMD:
 592                 err = -EPERM;
 593                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 594                         break;
 595                 err = vlan_dev_set_egress_priority(dev,
 596                                                    args.u.skb_priority,
 597                                                    args.vlan_qos);
 598                 break;
 599
 600         case SET_VLAN_FLAG_CMD:
 601                 err = -EPERM;
 602                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 603                         break;
 604                 err = vlan_dev_change_flags(dev,
 605                                             args.vlan_qos ? args.u.flag : 0,
 606                                             args.u.flag);
 607                 break;
 608
 609         case SET_VLAN_NAME_TYPE_CMD:
 610                 err = -EPERM;
 611                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 612                         break;
 613                 if (args.u.name_type < VLAN_NAME_TYPE_HIGHEST) {
 614                         struct vlan_net *vn;
 615
 616                         vn = net_generic(net, vlan_net_id);
 617                         vn->name_type = args.u.name_type;
 618                         err = 0;
 619                 } else {
 620                         err = -EINVAL;
 621                 }
 622                 break;
 623
 624         case ADD_VLAN_CMD:
 625                 err = -EPERM;
 626                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 627                         break;
 628                 err = register_vlan_device(dev, args.u.VID);
 629                 break;
 630
 631         case DEL_VLAN_CMD:
 632                 err = -EPERM;
 633                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 634                         break;
 635                 unregister_vlan_dev(dev, NULL);
 636                 err = 0;
 637                 break;
 638
 639         case GET_VLAN_REALDEV_NAME_CMD:
 640                 err = 0;
 641                 vlan_dev_get_realdev_name(dev, args.u.device2,
 642                                           sizeof(args.u.device2));
 643                 if (copy_to_user(arg, &args,
 644                                  sizeof(struct vlan_ioctl_args)))
 645                         err = -EFAULT;
 646                 break;
 647
 648         case GET_VLAN_VID_CMD:
 649                 err = 0;
 650                 args.u.VID = vlan_dev_vlan_id(dev);
 651                 if (copy_to_user(arg, &args,
 652                                  sizeof(struct vlan_ioctl_args)))
 653                       err = -EFAULT;
 654                 break;
 655
 656         default:
 657                 err = -EOPNOTSUPP;
 658                 break;
 659         }
 660 out:
 661         rtnl_unlock();
 662         return err;
 663 }
 664
 665 static int __net_init vlan_init_net(struct net *net)
 666 {
 667         struct vlan_net *vn = net_generic(net, vlan_net_id);
 668         int err;
 669
 670         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
 671
 672         err = vlan_proc_init(net);
 673
 674         return err;
 675 }
 676
 677 static void __net_exit vlan_exit_net(struct net *net)
 678 {
 679         vlan_proc_cleanup(net);
 680 }
 681
 682 static struct pernet_operations vlan_net_ops = {
 683         .init = vlan_init_net,
 684         .exit = vlan_exit_net,
 685         .id   = &vlan_net_id,
 686         .size = sizeof(struct vlan_net),
 687 };
 688
 689 static int __init vlan_proto_init(void)
 690 {
 691         int err;
 692
 693         pr_info("%s v%s\n", vlan_fullname, vlan_version);
 694
 695         err = register_pernet_subsys(&vlan_net_ops);
 696         if (err < 0)
 697                 goto err0;
 698
 699         err = register_netdevice_notifier(&vlan_notifier_block);
 700         if (err < 0)
 701                 goto err2;
 702
 703         err = vlan_gvrp_init();
 704         if (err < 0)
 705                 goto err3;
 706
 707         err = vlan_mvrp_init();
 708         if (err < 0)
 709                 goto err4;
 710
 711         err = vlan_netlink_init();
 712         if (err < 0)
 713                 goto err5;
 714
 715         vlan_ioctl_set(vlan_ioctl_handler);
 716         return 0;
 717
 718 err5:
 719         vlan_mvrp_uninit();
 720 err4:
 721         vlan_gvrp_uninit();
 722 err3:
 723         unregister_netdevice_notifier(&vlan_notifier_block);
 724 err2:
 725         unregister_pernet_subsys(&vlan_net_ops);
 726 err0:
 727         return err;
 728 }
 729
 730 static void __exit vlan_cleanup_module(void)
 731 {
 732         vlan_ioctl_set(NULL);
 733
 734         vlan_netlink_fini();
 735
 736         unregister_netdevice_notifier(&vlan_notifier_block);
 737
 738         unregister_pernet_subsys(&vlan_net_ops);
 739         rcu_barrier(); /* Wait for completion of call_rcu()'s */
 740
 741         vlan_mvrp_uninit();
 742         vlan_gvrp_uninit();
 743 }
 744
 745 module_init(vlan_proto_init);
 746 module_exit(vlan_cleanup_module);
 747
 748 MODULE_LICENSE("GPL");
 749 MODULE_VERSION(DRV_VERSION);