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