net/8021q/vlan.c

   1 /*
   2  * INET         802.1Q VLAN
   3  *              Ethernet-type device handling.
   4  *
   5  * Authors:     Ben Greear <greearb@candelatech.com>
   6  *              Please send support related email to: netdev@vger.kernel.org
   7  *              VLAN Home Page: http://www.candelatech.com/~greear/vlan.html
   8  *
   9  * Fixes:
  10  *              Fix for packet capture - Nick Eggleston <nick@dccinc.com>;
  11  *              Add HW acceleration hooks - David S. Miller <davem@redhat.com>;
  12  *              Correct all the locking - David S. Miller <davem@redhat.com>;
  13  *              Use hash table for VLAN groups - David S. Miller <davem@redhat.com>
  14  *
  15  *              This program is free software; you can redistribute it and/or
  16  *              modify it under the terms of the GNU General Public License
  17  *              as published by the Free Software Foundation; either version
  18  *              2 of the License, or (at your option) any later version.
  19  */
  20
  21 #include <linux/capability.h>
  22 #include <linux/module.h>
  23 #include <linux/netdevice.h>
  24 #include <linux/skbuff.h>
  25 #include <linux/slab.h>
  26 #include <linux/init.h>
  27 #include <linux/rculist.h>
  28 #include <net/p8022.h>
  29 #include <net/arp.h>
  30 #include <linux/rtnetlink.h>
  31 #include <linux/notifier.h>
  32 #include <net/rtnetlink.h>
  33 #include <net/net_namespace.h>
  34 #include <net/netns/generic.h>
  35 #include <asm/uaccess.h>
  36
  37 #include <linux/if_vlan.h>
  38 #include "vlan.h"
  39 #include "vlanproc.h"
  40
  41 #define DRV_VERSION "1.8"
  42
  43 /* Global VLAN variables */
  44
  45 int vlan_net_id __read_mostly;
  46
  47 /* Our listing of VLAN group(s) */
  48 static struct hlist_head vlan_group_hash[VLAN_GRP_HASH_SIZE];
  49
  50 const char vlan_fullname[] = "802.1Q VLAN Support";
  51 const char vlan_version[] = DRV_VERSION;
  52 static const char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>";
  53 static const char vlan_buggyright[] = "David S. Miller <davem@redhat.com>";
  54
  55 static struct packet_type vlan_packet_type __read_mostly = {
  56         .type = cpu_to_be16(ETH_P_8021Q),
  57         .func = vlan_skb_recv, /* VLAN receive method */
  58 };
  59
  60 /* End of global variables definitions. */
  61
  62 static inline unsigned int vlan_grp_hashfn(unsigned int idx)
  63 {
  64         return ((idx >> VLAN_GRP_HASH_SHIFT) ^ idx) & VLAN_GRP_HASH_MASK;
  65 }
  66
  67 /* Must be invoked with RCU read lock (no preempt) */
  68 static struct vlan_group *__vlan_find_group(struct net_device *real_dev)
  69 {
  70         struct vlan_group *grp;
  71         struct hlist_node *n;
  72         int hash = vlan_grp_hashfn(real_dev->ifindex);
  73
  74         hlist_for_each_entry_rcu(grp, n, &vlan_group_hash[hash], hlist) {
  75                 if (grp->real_dev == real_dev)
  76                         return grp;
  77         }
  78
  79         return NULL;
  80 }
  81
  82 /*  Find the protocol handler.  Assumes VID < VLAN_VID_MASK.
  83  *
  84  * Must be invoked with RCU read lock (no preempt)
  85  */
  86 struct net_device *__find_vlan_dev(struct net_device *real_dev, u16 vlan_id)
  87 {
  88         struct vlan_group *grp = __vlan_find_group(real_dev);
  89
  90         if (grp)
  91                 return vlan_group_get_device(grp, vlan_id);
  92
  93         return NULL;
  94 }
  95
  96 static void vlan_group_free(struct vlan_group *grp)
  97 {
  98         int i;
  99
 100         for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
 101                 kfree(grp->vlan_devices_arrays[i]);
 102         kfree(grp);
 103 }
 104
 105 static struct vlan_group *vlan_group_alloc(struct net_device *real_dev)
 106 {
 107         struct vlan_group *grp;
 108
 109         grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
 110         if (!grp)
 111                 return NULL;
 112
 113         grp->real_dev = real_dev;
 114         hlist_add_head_rcu(&grp->hlist,
 115                         &vlan_group_hash[vlan_grp_hashfn(real_dev->ifindex)]);
 116         return grp;
 117 }
 118
 119 static int vlan_group_prealloc_vid(struct vlan_group *vg, u16 vlan_id)
 120 {
 121         struct net_device **array;
 122         unsigned int size;
 123
 124         ASSERT_RTNL();
 125
 126         array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
 127         if (array != NULL)
 128                 return 0;
 129
 130         size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
 131         array = kzalloc(size, GFP_KERNEL);
 132         if (array == NULL)
 133                 return -ENOBUFS;
 134
 135         vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN] = array;
 136         return 0;
 137 }
 138
 139 static void vlan_rcu_free(struct rcu_head *rcu)
 140 {
 141         vlan_group_free(container_of(rcu, struct vlan_group, rcu));
 142 }
 143
 144 void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
 145 {
 146         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 147         struct net_device *real_dev = vlan->real_dev;
 148         const struct net_device_ops *ops = real_dev->netdev_ops;
 149         struct vlan_group *grp;
 150         u16 vlan_id = vlan->vlan_id;
 151
 152         ASSERT_RTNL();
 153
 154         grp = __vlan_find_group(real_dev);
 155         BUG_ON(!grp);
 156
 157         /* Take it out of our own structures, but be sure to interlock with
 158          * HW accelerating devices or SW vlan input packet processing if
 159          * VLAN is not 0 (leave it there for 802.1p).
 160          */
 161         if (vlan_id && (real_dev->features & NETIF_F_HW_VLAN_FILTER))
 162                 ops->ndo_vlan_rx_kill_vid(real_dev, vlan_id);
 163
 164         grp->nr_vlans--;
 165
 166         vlan_group_set_device(grp, vlan_id, NULL);
 167         if (!grp->killall)
 168                 synchronize_net();
 169
 170         unregister_netdevice_queue(dev, head);
 171
 172         /* If the group is now empty, kill off the group. */
 173         if (grp->nr_vlans == 0) {
 174                 vlan_gvrp_uninit_applicant(real_dev);
 175
 176                 if (real_dev->features & NETIF_F_HW_VLAN_RX)
 177                         ops->ndo_vlan_rx_register(real_dev, NULL);
 178
 179                 hlist_del_rcu(&grp->hlist);
 180
 181                 /* Free the group, after all cpu's are done. */
 182                 call_rcu(&grp->rcu, vlan_rcu_free);
 183         }
 184
 185         /* Get rid of the vlan's reference to real_dev */
 186         dev_put(real_dev);
 187 }
 188
 189 int vlan_check_real_dev(struct net_device *real_dev, u16 vlan_id)
 190 {
 191         const char *name = real_dev->name;
 192         const struct net_device_ops *ops = real_dev->netdev_ops;
 193
 194         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
 195                 pr_info("8021q: VLANs not supported on %s\n", name);
 196                 return -EOPNOTSUPP;
 197         }
 198
 199         if ((real_dev->features & NETIF_F_HW_VLAN_RX) && !ops->ndo_vlan_rx_register) {
 200                 pr_info("8021q: device %s has buggy VLAN hw accel\n", name);
 201                 return -EOPNOTSUPP;
 202         }
 203
 204         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 205             (!ops->ndo_vlan_rx_add_vid || !ops->ndo_vlan_rx_kill_vid)) {
 206                 pr_info("8021q: Device %s has buggy VLAN hw accel\n", name);
 207                 return -EOPNOTSUPP;
 208         }
 209
 210         if (__find_vlan_dev(real_dev, vlan_id) != NULL)
 211                 return -EEXIST;
 212
 213         return 0;
 214 }
 215
 216 int register_vlan_dev(struct net_device *dev)
 217 {
 218         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 219         struct net_device *real_dev = vlan->real_dev;
 220         const struct net_device_ops *ops = real_dev->netdev_ops;
 221         u16 vlan_id = vlan->vlan_id;
 222         struct vlan_group *grp, *ngrp = NULL;
 223         int err;
 224
 225         grp = __vlan_find_group(real_dev);
 226         if (!grp) {
 227                 ngrp = grp = vlan_group_alloc(real_dev);
 228                 if (!grp)
 229                         return -ENOBUFS;
 230                 err = vlan_gvrp_init_applicant(real_dev);
 231                 if (err < 0)
 232                         goto out_free_group;
 233         }
 234
 235         err = vlan_group_prealloc_vid(grp, vlan_id);
 236         if (err < 0)
 237                 goto out_uninit_applicant;
 238
 239         err = register_netdevice(dev);
 240         if (err < 0)
 241                 goto out_uninit_applicant;
 242
 243         /* Account for reference in struct vlan_dev_info */
 244         dev_hold(real_dev);
 245
 246         netif_stacked_transfer_operstate(real_dev, dev);
 247         linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
 248
 249         /* So, got the sucker initialized, now lets place
 250          * it into our local structure.
 251          */
 252         vlan_group_set_device(grp, vlan_id, dev);
 253         grp->nr_vlans++;
 254
 255         if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX)
 256                 ops->ndo_vlan_rx_register(real_dev, ngrp);
 257         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 258                 ops->ndo_vlan_rx_add_vid(real_dev, vlan_id);
 259
 260         return 0;
 261
 262 out_uninit_applicant:
 263         if (ngrp)
 264                 vlan_gvrp_uninit_applicant(real_dev);
 265 out_free_group:
 266         if (ngrp) {
 267                 hlist_del_rcu(&ngrp->hlist);
 268                 /* Free the group, after all cpu's are done. */
 269                 call_rcu(&ngrp->rcu, vlan_rcu_free);
 270         }
 271         return err;
 272 }
 273
 274 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
 275  *  Returns 0 if the device was created or a negative error code otherwise.
 276  */
 277 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
 278 {
 279         struct net_device *new_dev;
 280         struct net *net = dev_net(real_dev);
 281         struct vlan_net *vn = net_generic(net, vlan_net_id);
 282         char name[IFNAMSIZ];
 283         int err;
 284
 285         if (vlan_id >= VLAN_VID_MASK)
 286                 return -ERANGE;
 287
 288         err = vlan_check_real_dev(real_dev, vlan_id);
 289         if (err < 0)
 290                 return err;
 291
 292         /* Gotta set up the fields for the device. */
 293         switch (vn->name_type) {
 294         case VLAN_NAME_TYPE_RAW_PLUS_VID:
 295                 /* name will look like:  eth1.0005 */
 296                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
 297                 break;
 298         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
 299                 /* Put our vlan.VID in the name.
 300                  * Name will look like:  vlan5
 301                  */
 302                 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
 303                 break;
 304         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
 305                 /* Put our vlan.VID in the name.
 306                  * Name will look like:  eth0.5
 307                  */
 308                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
 309                 break;
 310         case VLAN_NAME_TYPE_PLUS_VID:
 311                 /* Put our vlan.VID in the name.
 312                  * Name will look like:  vlan0005
 313                  */
 314         default:
 315                 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
 316         }
 317
 318         new_dev = alloc_netdev_mq(sizeof(struct vlan_dev_info), name,
 319                                   vlan_setup, real_dev->num_tx_queues);
 320
 321         if (new_dev == NULL)
 322                 return -ENOBUFS;
 323
 324         new_dev->real_num_tx_queues = real_dev->real_num_tx_queues;
 325         dev_net_set(new_dev, net);
 326         /* need 4 bytes for extra VLAN header info,
 327          * hope the underlying device can handle it.
 328          */
 329         new_dev->mtu = real_dev->mtu;
 330
 331         vlan_dev_info(new_dev)->vlan_id = vlan_id;
 332         vlan_dev_info(new_dev)->real_dev = real_dev;
 333         vlan_dev_info(new_dev)->dent = NULL;
 334         vlan_dev_info(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
 335
 336         new_dev->rtnl_link_ops = &vlan_link_ops;
 337         err = register_vlan_dev(new_dev);
 338         if (err < 0)
 339                 goto out_free_newdev;
 340
 341         return 0;
 342
 343 out_free_newdev:
 344         free_netdev(new_dev);
 345         return err;
 346 }
 347
 348 static void vlan_sync_address(struct net_device *dev,
 349                               struct net_device *vlandev)
 350 {
 351         struct vlan_dev_info *vlan = vlan_dev_info(vlandev);
 352
 353         /* May be called without an actual change */
 354         if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
 355                 return;
 356
 357         /* vlan address was different from the old address and is equal to
 358          * the new address */
 359         if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
 360             !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
 361                 dev_uc_del(dev, vlandev->dev_addr);
 362
 363         /* vlan address was equal to the old address and is different from
 364          * the new address */
 365         if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
 366             compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
 367                 dev_uc_add(dev, vlandev->dev_addr);
 368
 369         memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
 370 }
 371
 372 static void vlan_transfer_features(struct net_device *dev,
 373                                    struct net_device *vlandev)
 374 {
 375         unsigned long old_features = vlandev->features;
 376
 377         vlandev->features &= ~dev->vlan_features;
 378         vlandev->features |= dev->features & dev->vlan_features;
 379         vlandev->gso_max_size = dev->gso_max_size;
 380 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 381         vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
 382 #endif
 383         vlandev->real_num_tx_queues = dev->real_num_tx_queues;
 384         BUG_ON(vlandev->real_num_tx_queues > vlandev->num_tx_queues);
 385
 386         if (old_features != vlandev->features)
 387                 netdev_features_change(vlandev);
 388 }
 389
 390 static void __vlan_device_event(struct net_device *dev, unsigned long event)
 391 {
 392         switch (event) {
 393         case NETDEV_CHANGENAME:
 394                 vlan_proc_rem_dev(dev);
 395                 if (vlan_proc_add_dev(dev) < 0)
 396                         pr_warning("8021q: failed to change proc name for %s\n",
 397                                         dev->name);
 398                 break;
 399         case NETDEV_REGISTER:
 400                 if (vlan_proc_add_dev(dev) < 0)
 401                         pr_warning("8021q: failed to add proc entry for %s\n",
 402                                         dev->name);
 403                 break;
 404         case NETDEV_UNREGISTER:
 405                 vlan_proc_rem_dev(dev);
 406                 break;
 407         }
 408 }
 409
 410 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
 411                              void *ptr)
 412 {
 413         struct net_device *dev = ptr;
 414         struct vlan_group *grp;
 415         int i, flgs;
 416         struct net_device *vlandev;
 417         struct vlan_dev_info *vlan;
 418         LIST_HEAD(list);
 419
 420         if (is_vlan_dev(dev))
 421                 __vlan_device_event(dev, event);
 422
 423         if ((event == NETDEV_UP) &&
 424             (dev->features & NETIF_F_HW_VLAN_FILTER) &&
 425             dev->netdev_ops->ndo_vlan_rx_add_vid) {
 426                 pr_info("8021q: adding VLAN 0 to HW filter on device %s\n",
 427                         dev->name);
 428                 dev->netdev_ops->ndo_vlan_rx_add_vid(dev, 0);
 429         }
 430
 431         grp = __vlan_find_group(dev);
 432         if (!grp)
 433                 goto out;
 434
 435         /* It is OK that we do not hold the group lock right now,
 436          * as we run under the RTNL lock.
 437          */
 438
 439         switch (event) {
 440         case NETDEV_CHANGE:
 441                 /* Propagate real device state to vlan devices */
 442                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 443                         vlandev = vlan_group_get_device(grp, i);
 444                         if (!vlandev)
 445                                 continue;
 446
 447                         netif_stacked_transfer_operstate(dev, vlandev);
 448                 }
 449                 break;
 450
 451         case NETDEV_CHANGEADDR:
 452                 /* Adjust unicast filters on underlying device */
 453                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 454                         vlandev = vlan_group_get_device(grp, i);
 455                         if (!vlandev)
 456                                 continue;
 457
 458                         flgs = vlandev->flags;
 459                         if (!(flgs & IFF_UP))
 460                                 continue;
 461
 462                         vlan_sync_address(dev, vlandev);
 463                 }
 464                 break;
 465
 466         case NETDEV_CHANGEMTU:
 467                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 468                         vlandev = vlan_group_get_device(grp, i);
 469                         if (!vlandev)
 470                                 continue;
 471
 472                         if (vlandev->mtu <= dev->mtu)
 473                                 continue;
 474
 475                         dev_set_mtu(vlandev, dev->mtu);
 476                 }
 477                 break;
 478
 479         case NETDEV_FEAT_CHANGE:
 480                 /* Propagate device features to underlying device */
 481                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 482                         vlandev = vlan_group_get_device(grp, i);
 483                         if (!vlandev)
 484                                 continue;
 485
 486                         vlan_transfer_features(dev, vlandev);
 487                 }
 488
 489                 break;
 490
 491         case NETDEV_DOWN:
 492                 /* Put all VLANs for this dev in the down state too.  */
 493                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 494                         vlandev = vlan_group_get_device(grp, i);
 495                         if (!vlandev)
 496                                 continue;
 497
 498                         flgs = vlandev->flags;
 499                         if (!(flgs & IFF_UP))
 500                                 continue;
 501
 502                         vlan = vlan_dev_info(vlandev);
 503                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 504                                 dev_change_flags(vlandev, flgs & ~IFF_UP);
 505                         netif_stacked_transfer_operstate(dev, vlandev);
 506                 }
 507                 break;
 508
 509         case NETDEV_UP:
 510                 /* Put all VLANs for this dev in the up state too.  */
 511                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 512                         vlandev = vlan_group_get_device(grp, i);
 513                         if (!vlandev)
 514                                 continue;
 515
 516                         flgs = vlandev->flags;
 517                         if (flgs & IFF_UP)
 518                                 continue;
 519
 520                         vlan = vlan_dev_info(vlandev);
 521                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 522                                 dev_change_flags(vlandev, flgs | IFF_UP);
 523                         netif_stacked_transfer_operstate(dev, vlandev);
 524                 }
 525                 break;
 526
 527         case NETDEV_UNREGISTER:
 528                 /* Delete all VLANs for this dev. */
 529                 grp->killall = 1;
 530
 531                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 532                         vlandev = vlan_group_get_device(grp, i);
 533                         if (!vlandev)
 534                                 continue;
 535
 536                         /* unregistration of last vlan destroys group, abort
 537                          * afterwards */
 538                         if (grp->nr_vlans == 1)
 539                                 i = VLAN_GROUP_ARRAY_LEN;
 540
 541                         unregister_vlan_dev(vlandev, &list);
 542                 }
 543                 unregister_netdevice_many(&list);
 544                 break;
 545
 546         case NETDEV_PRE_TYPE_CHANGE:
 547                 /* Forbid underlaying device to change its type. */
 548                 return NOTIFY_BAD;
 549         }
 550
 551 out:
 552         return NOTIFY_DONE;
 553 }
 554
 555 static struct notifier_block vlan_notifier_block __read_mostly = {
 556         .notifier_call = vlan_device_event,
 557 };
 558
 559 /*
 560  *      VLAN IOCTL handler.
 561  *      o execute requested action or pass command to the device driver
 562  *   arg is really a struct vlan_ioctl_args __user *.
 563  */
 564 static int vlan_ioctl_handler(struct net *net, void __user *arg)
 565 {
 566         int err;
 567         struct vlan_ioctl_args args;
 568         struct net_device *dev = NULL;
 569
 570         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 571                 return -EFAULT;
 572
 573         /* Null terminate this sucker, just in case. */
 574         args.device1[23] = 0;
 575         args.u.device2[23] = 0;
 576
 577         rtnl_lock();
 578
 579         switch (args.cmd) {
 580         case SET_VLAN_INGRESS_PRIORITY_CMD:
 581         case SET_VLAN_EGRESS_PRIORITY_CMD:
 582         case SET_VLAN_FLAG_CMD:
 583         case ADD_VLAN_CMD:
 584         case DEL_VLAN_CMD:
 585         case GET_VLAN_REALDEV_NAME_CMD:
 586         case GET_VLAN_VID_CMD:
 587                 err = -ENODEV;
 588                 dev = __dev_get_by_name(net, args.device1);
 589                 if (!dev)
 590                         goto out;
 591
 592                 err = -EINVAL;
 593                 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
 594                         goto out;
 595         }
 596
 597         switch (args.cmd) {
 598         case SET_VLAN_INGRESS_PRIORITY_CMD:
 599                 err = -EPERM;
 600                 if (!capable(CAP_NET_ADMIN))
 601                         break;
 602                 vlan_dev_set_ingress_priority(dev,
 603                                               args.u.skb_priority,
 604                                               args.vlan_qos);
 605                 err = 0;
 606                 break;
 607
 608         case SET_VLAN_EGRESS_PRIORITY_CMD:
 609                 err = -EPERM;
 610                 if (!capable(CAP_NET_ADMIN))
 611                         break;
 612                 err = vlan_dev_set_egress_priority(dev,
 613                                                    args.u.skb_priority,
 614                                                    args.vlan_qos);
 615                 break;
 616
 617         case SET_VLAN_FLAG_CMD:
 618                 err = -EPERM;
 619                 if (!capable(CAP_NET_ADMIN))
 620                         break;
 621                 err = vlan_dev_change_flags(dev,
 622                                             args.vlan_qos ? args.u.flag : 0,
 623                                             args.u.flag);
 624                 break;
 625
 626         case SET_VLAN_NAME_TYPE_CMD:
 627                 err = -EPERM;
 628                 if (!capable(CAP_NET_ADMIN))
 629                         break;
 630                 if ((args.u.name_type >= 0) &&
 631                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
 632                         struct vlan_net *vn;
 633
 634                         vn = net_generic(net, vlan_net_id);
 635                         vn->name_type = args.u.name_type;
 636                         err = 0;
 637                 } else {
 638                         err = -EINVAL;
 639                 }
 640                 break;
 641
 642         case ADD_VLAN_CMD:
 643                 err = -EPERM;
 644                 if (!capable(CAP_NET_ADMIN))
 645                         break;
 646                 err = register_vlan_device(dev, args.u.VID);
 647                 break;
 648
 649         case DEL_VLAN_CMD:
 650                 err = -EPERM;
 651                 if (!capable(CAP_NET_ADMIN))
 652                         break;
 653                 unregister_vlan_dev(dev, NULL);
 654                 err = 0;
 655                 break;
 656
 657         case GET_VLAN_REALDEV_NAME_CMD:
 658                 err = 0;
 659                 vlan_dev_get_realdev_name(dev, args.u.device2);
 660                 if (copy_to_user(arg, &args,
 661                                  sizeof(struct vlan_ioctl_args)))
 662                         err = -EFAULT;
 663                 break;
 664
 665         case GET_VLAN_VID_CMD:
 666                 err = 0;
 667                 args.u.VID = vlan_dev_vlan_id(dev);
 668                 if (copy_to_user(arg, &args,
 669                                  sizeof(struct vlan_ioctl_args)))
 670                       err = -EFAULT;
 671                 break;
 672
 673         default:
 674                 err = -EOPNOTSUPP;
 675                 break;
 676         }
 677 out:
 678         rtnl_unlock();
 679         return err;
 680 }
 681
 682 static int __net_init vlan_init_net(struct net *net)
 683 {
 684         struct vlan_net *vn = net_generic(net, vlan_net_id);
 685         int err;
 686
 687         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
 688
 689         err = vlan_proc_init(net);
 690
 691         return err;
 692 }
 693
 694 static void __net_exit vlan_exit_net(struct net *net)
 695 {
 696         vlan_proc_cleanup(net);
 697 }
 698
 699 static struct pernet_operations vlan_net_ops = {
 700         .init = vlan_init_net,
 701         .exit = vlan_exit_net,
 702         .id   = &vlan_net_id,
 703         .size = sizeof(struct vlan_net),
 704 };
 705
 706 static int __init vlan_proto_init(void)
 707 {
 708         int err;
 709
 710         pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright);
 711         pr_info("All bugs added by %s\n", vlan_buggyright);
 712
 713         err = register_pernet_subsys(&vlan_net_ops);
 714         if (err < 0)
 715                 goto err0;
 716
 717         err = register_netdevice_notifier(&vlan_notifier_block);
 718         if (err < 0)
 719                 goto err2;
 720
 721         err = vlan_gvrp_init();
 722         if (err < 0)
 723                 goto err3;
 724
 725         err = vlan_netlink_init();
 726         if (err < 0)
 727                 goto err4;
 728
 729         dev_add_pack(&vlan_packet_type);
 730         vlan_ioctl_set(vlan_ioctl_handler);
 731         return 0;
 732
 733 err4:
 734         vlan_gvrp_uninit();
 735 err3:
 736         unregister_netdevice_notifier(&vlan_notifier_block);
 737 err2:
 738         unregister_pernet_subsys(&vlan_net_ops);
 739 err0:
 740         return err;
 741 }
 742
 743 static void __exit vlan_cleanup_module(void)
 744 {
 745         unsigned int i;
 746
 747         vlan_ioctl_set(NULL);
 748         vlan_netlink_fini();
 749
 750         unregister_netdevice_notifier(&vlan_notifier_block);
 751
 752         dev_remove_pack(&vlan_packet_type);
 753
 754         /* This table must be empty if there are no module references left. */
 755         for (i = 0; i < VLAN_GRP_HASH_SIZE; i++)
 756                 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
 757
 758         unregister_pernet_subsys(&vlan_net_ops);
 759         rcu_barrier(); /* Wait for completion of call_rcu()'s */
 760
 761         vlan_gvrp_uninit();
 762 }
 763
 764 module_init(vlan_proto_init);
 765 module_exit(vlan_cleanup_module);
 766
 767 MODULE_LICENSE("GPL");
 768 MODULE_VERSION(DRV_VERSION);