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