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         /* Get rid of the vlan's reference to real_dev */
 125         dev_put(real_dev);
 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         /* Account for reference in struct vlan_dev_priv */
 188         dev_hold(real_dev);
 189
 190         vlan_stacked_transfer_operstate(real_dev, dev, vlan);
 191         linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
 192
 193         /* So, got the sucker initialized, now lets place
 194          * it into our local structure.
 195          */
 196         vlan_group_set_device(grp, vlan->vlan_proto, vlan_id, dev);
 197         grp->nr_vlan_devs++;
 198
 199         return 0;
 200
 201 out_unregister_netdev:
 202         unregister_netdevice(dev);
 203 out_uninit_mvrp:
 204         if (grp->nr_vlan_devs == 0)
 205                 vlan_mvrp_uninit_applicant(real_dev);
 206 out_uninit_gvrp:
 207         if (grp->nr_vlan_devs == 0)
 208                 vlan_gvrp_uninit_applicant(real_dev);
 209 out_vid_del:
 210         vlan_vid_del(real_dev, vlan->vlan_proto, vlan_id);
 211         return err;
 212 }
 213
 214 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
 215  *  Returns 0 if the device was created or a negative error code otherwise.
 216  */
 217 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
 218 {
 219         struct net_device *new_dev;
 220         struct vlan_dev_priv *vlan;
 221         struct net *net = dev_net(real_dev);
 222         struct vlan_net *vn = net_generic(net, vlan_net_id);
 223         char name[IFNAMSIZ];
 224         int err;
 225
 226         if (vlan_id >= VLAN_VID_MASK)
 227                 return -ERANGE;
 228
 229         err = vlan_check_real_dev(real_dev, htons(ETH_P_8021Q), vlan_id,
 230                                   NULL);
 231         if (err < 0)
 232                 return err;
 233
 234         /* Gotta set up the fields for the device. */
 235         switch (vn->name_type) {
 236         case VLAN_NAME_TYPE_RAW_PLUS_VID:
 237                 /* name will look like:  eth1.0005 */
 238                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
 239                 break;
 240         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
 241                 /* Put our vlan.VID in the name.
 242                  * Name will look like:  vlan5
 243                  */
 244                 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
 245                 break;
 246         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
 247                 /* Put our vlan.VID in the name.
 248                  * Name will look like:  eth0.5
 249                  */
 250                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
 251                 break;
 252         case VLAN_NAME_TYPE_PLUS_VID:
 253                 /* Put our vlan.VID in the name.
 254                  * Name will look like:  vlan0005
 255                  */
 256         default:
 257                 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
 258         }
 259
 260         new_dev = alloc_netdev(sizeof(struct vlan_dev_priv), name,
 261                                NET_NAME_UNKNOWN, vlan_setup);
 262
 263         if (new_dev == NULL)
 264                 return -ENOBUFS;
 265
 266         dev_net_set(new_dev, net);
 267         /* need 4 bytes for extra VLAN header info,
 268          * hope the underlying device can handle it.
 269          */
 270         new_dev->mtu = real_dev->mtu;
 271
 272         vlan = vlan_dev_priv(new_dev);
 273         vlan->vlan_proto = htons(ETH_P_8021Q);
 274         vlan->vlan_id = vlan_id;
 275         vlan->real_dev = real_dev;
 276         vlan->dent = NULL;
 277         vlan->flags = VLAN_FLAG_REORDER_HDR;
 278
 279         new_dev->rtnl_link_ops = &vlan_link_ops;
 280         err = register_vlan_dev(new_dev, NULL);
 281         if (err < 0)
 282                 goto out_free_newdev;
 283
 284         return 0;
 285
 286 out_free_newdev:
 287         if (new_dev->reg_state == NETREG_UNINITIALIZED ||
 288             new_dev->reg_state == NETREG_UNREGISTERED)
 289                 free_netdev(new_dev);
 290         return err;
 291 }
 292
 293 static void vlan_sync_address(struct net_device *dev,
 294                               struct net_device *vlandev)
 295 {
 296         struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
 297
 298         /* May be called without an actual change */
 299         if (ether_addr_equal(vlan->real_dev_addr, dev->dev_addr))
 300                 return;
 301
 302         /* vlan continues to inherit address of lower device */
 303         if (vlan_dev_inherit_address(vlandev, dev))
 304                 goto out;
 305
 306         /* vlan address was different from the old address and is equal to
 307          * the new address */
 308         if (!ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) &&
 309             ether_addr_equal(vlandev->dev_addr, dev->dev_addr))
 310                 dev_uc_del(dev, vlandev->dev_addr);
 311
 312         /* vlan address was equal to the old address and is different from
 313          * the new address */
 314         if (ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) &&
 315             !ether_addr_equal(vlandev->dev_addr, dev->dev_addr))
 316                 dev_uc_add(dev, vlandev->dev_addr);
 317
 318 out:
 319         ether_addr_copy(vlan->real_dev_addr, dev->dev_addr);
 320 }
 321
 322 static void vlan_transfer_features(struct net_device *dev,
 323                                    struct net_device *vlandev)
 324 {
 325         struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
 326
 327         vlandev->gso_max_size = dev->gso_max_size;
 328         vlandev->gso_max_segs = dev->gso_max_segs;
 329
 330         if (vlan_hw_offload_capable(dev->features, vlan->vlan_proto))
 331                 vlandev->hard_header_len = dev->hard_header_len;
 332         else
 333                 vlandev->hard_header_len = dev->hard_header_len + VLAN_HLEN;
 334
 335 #if IS_ENABLED(CONFIG_FCOE)
 336         vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
 337 #endif
 338
 339         vlandev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
 340         vlandev->priv_flags |= (vlan->real_dev->priv_flags & IFF_XMIT_DST_RELEASE);
 341         vlandev->hw_enc_features = vlan_tnl_features(vlan->real_dev);
 342
 343         netdev_update_features(vlandev);
 344 }
 345
 346 static int __vlan_device_event(struct net_device *dev, unsigned long event)
 347 {
 348         int err = 0;
 349
 350         switch (event) {
 351         case NETDEV_CHANGENAME:
 352                 vlan_proc_rem_dev(dev);
 353                 err = vlan_proc_add_dev(dev);
 354                 break;
 355         case NETDEV_REGISTER:
 356                 err = vlan_proc_add_dev(dev);
 357                 break;
 358         case NETDEV_UNREGISTER:
 359                 vlan_proc_rem_dev(dev);
 360                 break;
 361         }
 362
 363         return err;
 364 }
 365
 366 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
 367                              void *ptr)
 368 {
 369         struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr);
 370         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 371         struct vlan_group *grp;
 372         struct vlan_info *vlan_info;
 373         int i, flgs;
 374         struct net_device *vlandev;
 375         struct vlan_dev_priv *vlan;
 376         bool last = false;
 377         LIST_HEAD(list);
 378         int err;
 379
 380         if (is_vlan_dev(dev)) {
 381                 int err = __vlan_device_event(dev, event);
 382
 383                 if (err)
 384                         return notifier_from_errno(err);
 385         }
 386
 387         if ((event == NETDEV_UP) &&
 388             (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)) {
 389                 pr_info("adding VLAN 0 to HW filter on device %s\n",
 390                         dev->name);
 391                 vlan_vid_add(dev, htons(ETH_P_8021Q), 0);
 392         }
 393         if (event == NETDEV_DOWN &&
 394             (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER))
 395                 vlan_vid_del(dev, htons(ETH_P_8021Q), 0);
 396
 397         vlan_info = rtnl_dereference(dev->vlan_info);
 398         if (!vlan_info)
 399                 goto out;
 400         grp = &vlan_info->grp;
 401
 402         /* It is OK that we do not hold the group lock right now,
 403          * as we run under the RTNL lock.
 404          */
 405
 406         switch (event) {
 407         case NETDEV_CHANGE:
 408                 /* Propagate real device state to vlan devices */
 409                 vlan_group_for_each_dev(grp, i, vlandev)
 410                         vlan_stacked_transfer_operstate(dev, vlandev,
 411                                                         vlan_dev_priv(vlandev));
 412                 break;
 413
 414         case NETDEV_CHANGEADDR:
 415                 /* Adjust unicast filters on underlying device */
 416                 vlan_group_for_each_dev(grp, i, vlandev) {
 417                         flgs = vlandev->flags;
 418                         if (!(flgs & IFF_UP))
 419                                 continue;
 420
 421                         vlan_sync_address(dev, vlandev);
 422                 }
 423                 break;
 424
 425         case NETDEV_CHANGEMTU:
 426                 vlan_group_for_each_dev(grp, i, vlandev) {
 427                         if (vlandev->mtu <= dev->mtu)
 428                                 continue;
 429
 430                         dev_set_mtu(vlandev, dev->mtu);
 431                 }
 432                 break;
 433
 434         case NETDEV_FEAT_CHANGE:
 435                 /* Propagate device features to underlying device */
 436                 vlan_group_for_each_dev(grp, i, vlandev)
 437                         vlan_transfer_features(dev, vlandev);
 438                 break;
 439
 440         case NETDEV_DOWN: {
 441                 struct net_device *tmp;
 442                 LIST_HEAD(close_list);
 443
 444                 /* Put all VLANs for this dev in the down state too.  */
 445                 vlan_group_for_each_dev(grp, i, vlandev) {
 446                         flgs = vlandev->flags;
 447                         if (!(flgs & IFF_UP))
 448                                 continue;
 449
 450                         vlan = vlan_dev_priv(vlandev);
 451                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 452                                 list_add(&vlandev->close_list, &close_list);
 453                 }
 454
 455                 dev_close_many(&close_list, false);
 456
 457                 list_for_each_entry_safe(vlandev, tmp, &close_list, close_list) {
 458                         vlan_stacked_transfer_operstate(dev, vlandev,
 459                                                         vlan_dev_priv(vlandev));
 460                         list_del_init(&vlandev->close_list);
 461                 }
 462                 list_del(&close_list);
 463                 break;
 464         }
 465         case NETDEV_UP:
 466                 /* Put all VLANs for this dev in the up state too.  */
 467                 vlan_group_for_each_dev(grp, i, vlandev) {
 468                         flgs = dev_get_flags(vlandev);
 469                         if (flgs & IFF_UP)
 470                                 continue;
 471
 472                         vlan = vlan_dev_priv(vlandev);
 473                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 474                                 dev_change_flags(vlandev, flgs | IFF_UP,
 475                                                  extack);
 476                         vlan_stacked_transfer_operstate(dev, vlandev, vlan);
 477                 }
 478                 break;
 479
 480         case NETDEV_UNREGISTER:
 481                 /* twiddle thumbs on netns device moves */
 482                 if (dev->reg_state != NETREG_UNREGISTERING)
 483                         break;
 484
 485                 vlan_group_for_each_dev(grp, i, vlandev) {
 486                         /* removal of last vid destroys vlan_info, abort
 487                          * afterwards */
 488                         if (vlan_info->nr_vids == 1)
 489                                 last = true;
 490
 491                         unregister_vlan_dev(vlandev, &list);
 492                         if (last)
 493                                 break;
 494                 }
 495                 unregister_netdevice_many(&list);
 496                 break;
 497
 498         case NETDEV_PRE_TYPE_CHANGE:
 499                 /* Forbid underlaying device to change its type. */
 500                 if (vlan_uses_dev(dev))
 501                         return NOTIFY_BAD;
 502                 break;
 503
 504         case NETDEV_NOTIFY_PEERS:
 505         case NETDEV_BONDING_FAILOVER:
 506         case NETDEV_RESEND_IGMP:
 507                 /* Propagate to vlan devices */
 508                 vlan_group_for_each_dev(grp, i, vlandev)
 509                         call_netdevice_notifiers(event, vlandev);
 510                 break;
 511
 512         case NETDEV_CVLAN_FILTER_PUSH_INFO:
 513                 err = vlan_filter_push_vids(vlan_info, htons(ETH_P_8021Q));
 514                 if (err)
 515                         return notifier_from_errno(err);
 516                 break;
 517
 518         case NETDEV_CVLAN_FILTER_DROP_INFO:
 519                 vlan_filter_drop_vids(vlan_info, htons(ETH_P_8021Q));
 520                 break;
 521
 522         case NETDEV_SVLAN_FILTER_PUSH_INFO:
 523                 err = vlan_filter_push_vids(vlan_info, htons(ETH_P_8021AD));
 524                 if (err)
 525                         return notifier_from_errno(err);
 526                 break;
 527
 528         case NETDEV_SVLAN_FILTER_DROP_INFO:
 529                 vlan_filter_drop_vids(vlan_info, htons(ETH_P_8021AD));
 530                 break;
 531         }
 532
 533 out:
 534         return NOTIFY_DONE;
 535 }
 536
 537 static struct notifier_block vlan_notifier_block __read_mostly = {
 538         .notifier_call = vlan_device_event,
 539 };
 540
 541 /*
 542  *      VLAN IOCTL handler.
 543  *      o execute requested action or pass command to the device driver
 544  *   arg is really a struct vlan_ioctl_args __user *.
 545  */
 546 static int vlan_ioctl_handler(struct net *net, void __user *arg)
 547 {
 548         int err;
 549         struct vlan_ioctl_args args;
 550         struct net_device *dev = NULL;
 551
 552         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 553                 return -EFAULT;
 554
 555         /* Null terminate this sucker, just in case. */
 556         args.device1[sizeof(args.device1) - 1] = 0;
 557         args.u.device2[sizeof(args.u.device2) - 1] = 0;
 558
 559         rtnl_lock();
 560
 561         switch (args.cmd) {
 562         case SET_VLAN_INGRESS_PRIORITY_CMD:
 563         case SET_VLAN_EGRESS_PRIORITY_CMD:
 564         case SET_VLAN_FLAG_CMD:
 565         case ADD_VLAN_CMD:
 566         case DEL_VLAN_CMD:
 567         case GET_VLAN_REALDEV_NAME_CMD:
 568         case GET_VLAN_VID_CMD:
 569                 err = -ENODEV;
 570                 dev = __dev_get_by_name(net, args.device1);
 571                 if (!dev)
 572                         goto out;
 573
 574                 err = -EINVAL;
 575                 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
 576                         goto out;
 577         }
 578
 579         switch (args.cmd) {
 580         case SET_VLAN_INGRESS_PRIORITY_CMD:
 581                 err = -EPERM;
 582                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 583                         break;
 584                 vlan_dev_set_ingress_priority(dev,
 585                                               args.u.skb_priority,
 586                                               args.vlan_qos);
 587                 err = 0;
 588                 break;
 589
 590         case SET_VLAN_EGRESS_PRIORITY_CMD:
 591                 err = -EPERM;
 592                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 593                         break;
 594                 err = vlan_dev_set_egress_priority(dev,
 595                                                    args.u.skb_priority,
 596                                                    args.vlan_qos);
 597                 break;
 598
 599         case SET_VLAN_FLAG_CMD:
 600                 err = -EPERM;
 601                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 602                         break;
 603                 err = vlan_dev_change_flags(dev,
 604                                             args.vlan_qos ? args.u.flag : 0,
 605                                             args.u.flag);
 606                 break;
 607
 608         case SET_VLAN_NAME_TYPE_CMD:
 609                 err = -EPERM;
 610                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 611                         break;
 612                 if (args.u.name_type < VLAN_NAME_TYPE_HIGHEST) {
 613                         struct vlan_net *vn;
 614
 615                         vn = net_generic(net, vlan_net_id);
 616                         vn->name_type = args.u.name_type;
 617                         err = 0;
 618                 } else {
 619                         err = -EINVAL;
 620                 }
 621                 break;
 622
 623         case ADD_VLAN_CMD:
 624                 err = -EPERM;
 625                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 626                         break;
 627                 err = register_vlan_device(dev, args.u.VID);
 628                 break;
 629
 630         case DEL_VLAN_CMD:
 631                 err = -EPERM;
 632                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 633                         break;
 634                 unregister_vlan_dev(dev, NULL);
 635                 err = 0;
 636                 break;
 637
 638         case GET_VLAN_REALDEV_NAME_CMD:
 639                 err = 0;
 640                 vlan_dev_get_realdev_name(dev, args.u.device2);
 641                 if (copy_to_user(arg, &args,
 642                                  sizeof(struct vlan_ioctl_args)))
 643                         err = -EFAULT;
 644                 break;
 645
 646         case GET_VLAN_VID_CMD:
 647                 err = 0;
 648                 args.u.VID = vlan_dev_vlan_id(dev);
 649                 if (copy_to_user(arg, &args,
 650                                  sizeof(struct vlan_ioctl_args)))
 651                       err = -EFAULT;
 652                 break;
 653
 654         default:
 655                 err = -EOPNOTSUPP;
 656                 break;
 657         }
 658 out:
 659         rtnl_unlock();
 660         return err;
 661 }
 662
 663 static int __net_init vlan_init_net(struct net *net)
 664 {
 665         struct vlan_net *vn = net_generic(net, vlan_net_id);
 666         int err;
 667
 668         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
 669
 670         err = vlan_proc_init(net);
 671
 672         return err;
 673 }
 674
 675 static void __net_exit vlan_exit_net(struct net *net)
 676 {
 677         vlan_proc_cleanup(net);
 678 }
 679
 680 static struct pernet_operations vlan_net_ops = {
 681         .init = vlan_init_net,
 682         .exit = vlan_exit_net,
 683         .id   = &vlan_net_id,
 684         .size = sizeof(struct vlan_net),
 685 };
 686
 687 static int __init vlan_proto_init(void)
 688 {
 689         int err;
 690
 691         pr_info("%s v%s\n", vlan_fullname, vlan_version);
 692
 693         err = register_pernet_subsys(&vlan_net_ops);
 694         if (err < 0)
 695                 goto err0;
 696
 697         err = register_netdevice_notifier(&vlan_notifier_block);
 698         if (err < 0)
 699                 goto err2;
 700
 701         err = vlan_gvrp_init();
 702         if (err < 0)
 703                 goto err3;
 704
 705         err = vlan_mvrp_init();
 706         if (err < 0)
 707                 goto err4;
 708
 709         err = vlan_netlink_init();
 710         if (err < 0)
 711                 goto err5;
 712
 713         vlan_ioctl_set(vlan_ioctl_handler);
 714         return 0;
 715
 716 err5:
 717         vlan_mvrp_uninit();
 718 err4:
 719         vlan_gvrp_uninit();
 720 err3:
 721         unregister_netdevice_notifier(&vlan_notifier_block);
 722 err2:
 723         unregister_pernet_subsys(&vlan_net_ops);
 724 err0:
 725         return err;
 726 }
 727
 728 static void __exit vlan_cleanup_module(void)
 729 {
 730         vlan_ioctl_set(NULL);
 731
 732         vlan_netlink_fini();
 733
 734         unregister_netdevice_notifier(&vlan_notifier_block);
 735
 736         unregister_pernet_subsys(&vlan_net_ops);
 737         rcu_barrier(); /* Wait for completion of call_rcu()'s */
 738
 739         vlan_mvrp_uninit();
 740         vlan_gvrp_uninit();
 741 }
 742
 743 module_init(vlan_proto_init);
 744 module_exit(vlan_cleanup_module);
 745
 746 MODULE_LICENSE("GPL");
 747 MODULE_VERSION(DRV_VERSION);