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: vlan@scry.wanfear.com
   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 <asm/uaccess.h> /* for copy_from_user */
  22 #include <linux/capability.h>
  23 #include <linux/module.h>
  24 #include <linux/netdevice.h>
  25 #include <linux/skbuff.h>
  26 #include <net/datalink.h>
  27 #include <linux/mm.h>
  28 #include <linux/in.h>
  29 #include <linux/init.h>
  30 #include <net/p8022.h>
  31 #include <net/arp.h>
  32 #include <linux/rtnetlink.h>
  33 #include <linux/notifier.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 /* Our listing of VLAN group(s) */
  44 static struct hlist_head vlan_group_hash[VLAN_GRP_HASH_SIZE];
  45 #define vlan_grp_hashfn(IDX)    ((((IDX) >> VLAN_GRP_HASH_SHIFT) ^ (IDX)) & VLAN_GRP_HASH_MASK)
  46
  47 static char vlan_fullname[] = "802.1Q VLAN Support";
  48 static char vlan_version[] = DRV_VERSION;
  49 static char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>";
  50 static char vlan_buggyright[] = "David S. Miller <davem@redhat.com>";
  51
  52 static int vlan_device_event(struct notifier_block *, unsigned long, void *);
  53 static int vlan_ioctl_handler(void __user *);
  54 static int unregister_vlan_dev(struct net_device *, unsigned short );
  55
  56 static struct notifier_block vlan_notifier_block = {
  57         .notifier_call = vlan_device_event,
  58 };
  59
  60 /* These may be changed at run-time through IOCTLs */
  61
  62 /* Determines interface naming scheme. */
  63 unsigned short vlan_name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
  64
  65 static struct packet_type vlan_packet_type = {
  66         .type = __constant_htons(ETH_P_8021Q),
  67         .func = vlan_skb_recv, /* VLAN receive method */
  68 };
  69
  70 /* End of global variables definitions. */
  71
  72 /*
  73  * Function vlan_proto_init (pro)
  74  *
  75  *    Initialize VLAN protocol layer,
  76  *
  77  */
  78 static int __init vlan_proto_init(void)
  79 {
  80         int err;
  81
  82         printk(VLAN_INF "%s v%s %s\n",
  83                vlan_fullname, vlan_version, vlan_copyright);
  84         printk(VLAN_INF "All bugs added by %s\n",
  85                vlan_buggyright);
  86
  87         /* proc file system initialization */
  88         err = vlan_proc_init();
  89         if (err < 0) {
  90                 printk(KERN_ERR
  91                        "%s %s: can't create entry in proc filesystem!\n",
  92                        __FUNCTION__, VLAN_NAME);
  93                 return err;
  94         }
  95
  96         dev_add_pack(&vlan_packet_type);
  97
  98         /* Register us to receive netdevice events */
  99         err = register_netdevice_notifier(&vlan_notifier_block);
 100         if (err < 0)
 101                 goto err1;
 102
 103         err = vlan_netlink_init();
 104         if (err < 0)
 105                 goto err2;
 106
 107         vlan_ioctl_set(vlan_ioctl_handler);
 108         return 0;
 109
 110 err2:
 111         unregister_netdevice_notifier(&vlan_notifier_block);
 112 err1:
 113         vlan_proc_cleanup();
 114         dev_remove_pack(&vlan_packet_type);
 115         return err;
 116 }
 117
 118 /* Cleanup all vlan devices
 119  * Note: devices that have been registered that but not
 120  * brought up will exist but have no module ref count.
 121  */
 122 static void __exit vlan_cleanup_devices(void)
 123 {
 124         struct net_device *dev, *nxt;
 125
 126         rtnl_lock();
 127         for_each_netdev_safe(dev, nxt) {
 128                 if (dev->priv_flags & IFF_802_1Q_VLAN) {
 129                         unregister_vlan_dev(VLAN_DEV_INFO(dev)->real_dev,
 130                                             VLAN_DEV_INFO(dev)->vlan_id);
 131
 132                         unregister_netdevice(dev);
 133                 }
 134         }
 135         rtnl_unlock();
 136 }
 137
 138 /*
 139  *     Module 'remove' entry point.
 140  *     o delete /proc/net/router directory and static entries.
 141  */
 142 static void __exit vlan_cleanup_module(void)
 143 {
 144         int i;
 145
 146         vlan_netlink_fini();
 147         vlan_ioctl_set(NULL);
 148
 149         /* Un-register us from receiving netdevice events */
 150         unregister_netdevice_notifier(&vlan_notifier_block);
 151
 152         dev_remove_pack(&vlan_packet_type);
 153         vlan_cleanup_devices();
 154
 155         /* This table must be empty if there are no module
 156          * references left.
 157          */
 158         for (i = 0; i < VLAN_GRP_HASH_SIZE; i++) {
 159                 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
 160         }
 161         vlan_proc_cleanup();
 162
 163         synchronize_net();
 164 }
 165
 166 module_init(vlan_proto_init);
 167 module_exit(vlan_cleanup_module);
 168
 169 /* Must be invoked with RCU read lock (no preempt) */
 170 static struct vlan_group *__vlan_find_group(int real_dev_ifindex)
 171 {
 172         struct vlan_group *grp;
 173         struct hlist_node *n;
 174         int hash = vlan_grp_hashfn(real_dev_ifindex);
 175
 176         hlist_for_each_entry_rcu(grp, n, &vlan_group_hash[hash], hlist) {
 177                 if (grp->real_dev_ifindex == real_dev_ifindex)
 178                         return grp;
 179         }
 180
 181         return NULL;
 182 }
 183
 184 /*  Find the protocol handler.  Assumes VID < VLAN_VID_MASK.
 185  *
 186  * Must be invoked with RCU read lock (no preempt)
 187  */
 188 struct net_device *__find_vlan_dev(struct net_device *real_dev,
 189                                    unsigned short VID)
 190 {
 191         struct vlan_group *grp = __vlan_find_group(real_dev->ifindex);
 192
 193         if (grp)
 194                 return vlan_group_get_device(grp, VID);
 195
 196         return NULL;
 197 }
 198
 199 static void vlan_group_free(struct vlan_group *grp)
 200 {
 201         int i;
 202
 203         for (i=0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
 204                 kfree(grp->vlan_devices_arrays[i]);
 205         kfree(grp);
 206 }
 207
 208 static struct vlan_group *vlan_group_alloc(int ifindex)
 209 {
 210         struct vlan_group *grp;
 211         unsigned int size;
 212         unsigned int i;
 213
 214         grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
 215         if (!grp)
 216                 return NULL;
 217
 218         size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
 219
 220         for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++) {
 221                 grp->vlan_devices_arrays[i] = kzalloc(size, GFP_KERNEL);
 222                 if (!grp->vlan_devices_arrays[i])
 223                         goto err;
 224         }
 225
 226         grp->real_dev_ifindex = ifindex;
 227         hlist_add_head_rcu(&grp->hlist,
 228                            &vlan_group_hash[vlan_grp_hashfn(ifindex)]);
 229         return grp;
 230
 231 err:
 232         vlan_group_free(grp);
 233         return NULL;
 234 }
 235
 236 static void vlan_rcu_free(struct rcu_head *rcu)
 237 {
 238         vlan_group_free(container_of(rcu, struct vlan_group, rcu));
 239 }
 240
 241
 242 /* This returns 0 if everything went fine.
 243  * It will return 1 if the group was killed as a result.
 244  * A negative return indicates failure.
 245  *
 246  * The RTNL lock must be held.
 247  */
 248 static int unregister_vlan_dev(struct net_device *real_dev,
 249                                unsigned short vlan_id)
 250 {
 251         struct net_device *dev = NULL;
 252         int real_dev_ifindex = real_dev->ifindex;
 253         struct vlan_group *grp;
 254         int i, ret;
 255
 256 #ifdef VLAN_DEBUG
 257         printk(VLAN_DBG "%s: VID: %i\n", __FUNCTION__, vlan_id);
 258 #endif
 259
 260         /* sanity check */
 261         if (vlan_id >= VLAN_VID_MASK)
 262                 return -EINVAL;
 263
 264         ASSERT_RTNL();
 265         grp = __vlan_find_group(real_dev_ifindex);
 266
 267         ret = 0;
 268
 269         if (grp) {
 270                 dev = vlan_group_get_device(grp, vlan_id);
 271                 if (dev) {
 272                         /* Remove proc entry */
 273                         vlan_proc_rem_dev(dev);
 274
 275                         /* Take it out of our own structures, but be sure to
 276                          * interlock with HW accelerating devices or SW vlan
 277                          * input packet processing.
 278                          */
 279                         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 280                                 real_dev->vlan_rx_kill_vid(real_dev, vlan_id);
 281
 282                         vlan_group_set_device(grp, vlan_id, NULL);
 283                         synchronize_net();
 284
 285
 286                         /* Caller unregisters (and if necessary, puts)
 287                          * VLAN device, but we get rid of the reference to
 288                          * real_dev here.
 289                          */
 290                         dev_put(real_dev);
 291
 292                         /* If the group is now empty, kill off the
 293                          * group.
 294                          */
 295                         for (i = 0; i < VLAN_VID_MASK; i++)
 296                                 if (vlan_group_get_device(grp, i))
 297                                         break;
 298
 299                         if (i == VLAN_VID_MASK) {
 300                                 if (real_dev->features & NETIF_F_HW_VLAN_RX)
 301                                         real_dev->vlan_rx_register(real_dev, NULL);
 302
 303                                 hlist_del_rcu(&grp->hlist);
 304
 305                                 /* Free the group, after all cpu's are done. */
 306                                 call_rcu(&grp->rcu, vlan_rcu_free);
 307
 308                                 grp = NULL;
 309                                 ret = 1;
 310                         }
 311                 }
 312         }
 313
 314         return ret;
 315 }
 316
 317 int unregister_vlan_device(struct net_device *dev)
 318 {
 319         int ret;
 320
 321         ret = unregister_vlan_dev(VLAN_DEV_INFO(dev)->real_dev,
 322                                   VLAN_DEV_INFO(dev)->vlan_id);
 323         unregister_netdevice(dev);
 324
 325         if (ret == 1)
 326                 ret = 0;
 327         return ret;
 328 }
 329
 330 /*
 331  * vlan network devices have devices nesting below it, and are a special
 332  * "super class" of normal network devices; split their locks off into a
 333  * separate class since they always nest.
 334  */
 335 static struct lock_class_key vlan_netdev_xmit_lock_key;
 336
 337 static int vlan_dev_init(struct net_device *dev)
 338 {
 339         struct net_device *real_dev = VLAN_DEV_INFO(dev)->real_dev;
 340
 341         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
 342         dev->flags  = real_dev->flags & ~IFF_UP;
 343         dev->iflink = real_dev->ifindex;
 344         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
 345                                           (1<<__LINK_STATE_DORMANT))) |
 346                       (1<<__LINK_STATE_PRESENT);
 347
 348         /* TODO: maybe just assign it to be ETHERNET? */
 349         dev->type = real_dev->type;
 350
 351         memcpy(dev->broadcast, real_dev->broadcast, real_dev->addr_len);
 352         memcpy(dev->dev_addr, real_dev->dev_addr, real_dev->addr_len);
 353         dev->addr_len = real_dev->addr_len;
 354
 355         if (real_dev->features & NETIF_F_HW_VLAN_TX) {
 356                 dev->hard_header     = real_dev->hard_header;
 357                 dev->hard_header_len = real_dev->hard_header_len;
 358                 dev->hard_start_xmit = vlan_dev_hwaccel_hard_start_xmit;
 359                 dev->rebuild_header  = real_dev->rebuild_header;
 360         } else {
 361                 dev->hard_header     = vlan_dev_hard_header;
 362                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
 363                 dev->hard_start_xmit = vlan_dev_hard_start_xmit;
 364                 dev->rebuild_header  = vlan_dev_rebuild_header;
 365         }
 366         dev->hard_header_parse = real_dev->hard_header_parse;
 367
 368         lockdep_set_class(&dev->_xmit_lock, &vlan_netdev_xmit_lock_key);
 369         return 0;
 370 }
 371
 372 void vlan_setup(struct net_device *new_dev)
 373 {
 374         SET_MODULE_OWNER(new_dev);
 375
 376         /* new_dev->ifindex = 0;  it will be set when added to
 377          * the global list.
 378          * iflink is set as well.
 379          */
 380         new_dev->get_stats = vlan_dev_get_stats;
 381
 382         /* Make this thing known as a VLAN device */
 383         new_dev->priv_flags |= IFF_802_1Q_VLAN;
 384
 385         /* Set us up to have no queue, as the underlying Hardware device
 386          * can do all the queueing we could want.
 387          */
 388         new_dev->tx_queue_len = 0;
 389
 390         /* set up method calls */
 391         new_dev->change_mtu = vlan_dev_change_mtu;
 392         new_dev->init = vlan_dev_init;
 393         new_dev->open = vlan_dev_open;
 394         new_dev->stop = vlan_dev_stop;
 395         new_dev->set_mac_address = vlan_dev_set_mac_address;
 396         new_dev->set_multicast_list = vlan_dev_set_multicast_list;
 397         new_dev->destructor = free_netdev;
 398         new_dev->do_ioctl = vlan_dev_ioctl;
 399 }
 400
 401 static void vlan_transfer_operstate(const struct net_device *dev, struct net_device *vlandev)
 402 {
 403         /* Have to respect userspace enforced dormant state
 404          * of real device, also must allow supplicant running
 405          * on VLAN device
 406          */
 407         if (dev->operstate == IF_OPER_DORMANT)
 408                 netif_dormant_on(vlandev);
 409         else
 410                 netif_dormant_off(vlandev);
 411
 412         if (netif_carrier_ok(dev)) {
 413                 if (!netif_carrier_ok(vlandev))
 414                         netif_carrier_on(vlandev);
 415         } else {
 416                 if (netif_carrier_ok(vlandev))
 417                         netif_carrier_off(vlandev);
 418         }
 419 }
 420
 421 int vlan_check_real_dev(struct net_device *real_dev, unsigned short vlan_id)
 422 {
 423         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
 424                 printk(VLAN_DBG "%s: VLANs not supported on %s.\n",
 425                         __FUNCTION__, real_dev->name);
 426                 return -EOPNOTSUPP;
 427         }
 428
 429         if ((real_dev->features & NETIF_F_HW_VLAN_RX) &&
 430             !real_dev->vlan_rx_register) {
 431                 printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
 432                         __FUNCTION__, real_dev->name);
 433                 return -EOPNOTSUPP;
 434         }
 435
 436         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 437             (!real_dev->vlan_rx_add_vid || !real_dev->vlan_rx_kill_vid)) {
 438                 printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
 439                         __FUNCTION__, real_dev->name);
 440                 return -EOPNOTSUPP;
 441         }
 442
 443         /* The real device must be up and operating in order to
 444          * assosciate a VLAN device with it.
 445          */
 446         if (!(real_dev->flags & IFF_UP))
 447                 return -ENETDOWN;
 448
 449         if (__find_vlan_dev(real_dev, vlan_id) != NULL) {
 450                 /* was already registered. */
 451                 printk(VLAN_DBG "%s: ALREADY had VLAN registered\n", __FUNCTION__);
 452                 return -EEXIST;
 453         }
 454
 455         return 0;
 456 }
 457
 458 int register_vlan_dev(struct net_device *dev)
 459 {
 460         struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev);
 461         struct net_device *real_dev = vlan->real_dev;
 462         unsigned short vlan_id = vlan->vlan_id;
 463         struct vlan_group *grp, *ngrp = NULL;
 464         int err;
 465
 466         grp = __vlan_find_group(real_dev->ifindex);
 467         if (!grp) {
 468                 ngrp = grp = vlan_group_alloc(real_dev->ifindex);
 469                 if (!grp)
 470                         return -ENOBUFS;
 471         }
 472
 473         err = register_netdevice(dev);
 474         if (err < 0)
 475                 goto out_free_group;
 476
 477         /* Account for reference in struct vlan_dev_info */
 478         dev_hold(real_dev);
 479
 480         vlan_transfer_operstate(real_dev, dev);
 481         linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
 482
 483         /* So, got the sucker initialized, now lets place
 484          * it into our local structure.
 485          */
 486         vlan_group_set_device(grp, vlan_id, dev);
 487         if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX)
 488                 real_dev->vlan_rx_register(real_dev, ngrp);
 489         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 490                 real_dev->vlan_rx_add_vid(real_dev, vlan_id);
 491
 492         if (vlan_proc_add_dev(dev) < 0)
 493                 printk(KERN_WARNING "VLAN: failed to add proc entry for %s\n",
 494                        dev->name);
 495         return 0;
 496
 497 out_free_group:
 498         if (ngrp)
 499                 vlan_group_free(ngrp);
 500         return err;
 501 }
 502
 503 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
 504  *  Returns 0 if the device was created or a negative error code otherwise.
 505  */
 506 static int register_vlan_device(struct net_device *real_dev,
 507                                 unsigned short VLAN_ID)
 508 {
 509         struct net_device *new_dev;
 510         char name[IFNAMSIZ];
 511         int err;
 512
 513 #ifdef VLAN_DEBUG
 514         printk(VLAN_DBG "%s: if_name -:%s:-     vid: %i\n",
 515                 __FUNCTION__, eth_IF_name, VLAN_ID);
 516 #endif
 517
 518         if (VLAN_ID >= VLAN_VID_MASK)
 519                 return -ERANGE;
 520
 521         err = vlan_check_real_dev(real_dev, VLAN_ID);
 522         if (err < 0)
 523                 return err;
 524
 525         /* Gotta set up the fields for the device. */
 526 #ifdef VLAN_DEBUG
 527         printk(VLAN_DBG "About to allocate name, vlan_name_type: %i\n",
 528                vlan_name_type);
 529 #endif
 530         switch (vlan_name_type) {
 531         case VLAN_NAME_TYPE_RAW_PLUS_VID:
 532                 /* name will look like:  eth1.0005 */
 533                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, VLAN_ID);
 534                 break;
 535         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
 536                 /* Put our vlan.VID in the name.
 537                  * Name will look like:  vlan5
 538                  */
 539                 snprintf(name, IFNAMSIZ, "vlan%i", VLAN_ID);
 540                 break;
 541         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
 542                 /* Put our vlan.VID in the name.
 543                  * Name will look like:  eth0.5
 544                  */
 545                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, VLAN_ID);
 546                 break;
 547         case VLAN_NAME_TYPE_PLUS_VID:
 548                 /* Put our vlan.VID in the name.
 549                  * Name will look like:  vlan0005
 550                  */
 551         default:
 552                 snprintf(name, IFNAMSIZ, "vlan%.4i", VLAN_ID);
 553         }
 554
 555         new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
 556                                vlan_setup);
 557
 558         if (new_dev == NULL)
 559                 return -ENOBUFS;
 560
 561         /* need 4 bytes for extra VLAN header info,
 562          * hope the underlying device can handle it.
 563          */
 564         new_dev->mtu = real_dev->mtu;
 565
 566 #ifdef VLAN_DEBUG
 567         printk(VLAN_DBG "Allocated new name -:%s:-\n", new_dev->name);
 568         VLAN_MEM_DBG("new_dev->priv malloc, addr: %p  size: %i\n",
 569                      new_dev->priv,
 570                      sizeof(struct vlan_dev_info));
 571 #endif
 572
 573         VLAN_DEV_INFO(new_dev)->vlan_id = VLAN_ID; /* 1 through VLAN_VID_MASK */
 574         VLAN_DEV_INFO(new_dev)->real_dev = real_dev;
 575         VLAN_DEV_INFO(new_dev)->dent = NULL;
 576         VLAN_DEV_INFO(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
 577
 578         new_dev->rtnl_link_ops = &vlan_link_ops;
 579         err = register_vlan_dev(new_dev);
 580         if (err < 0)
 581                 goto out_free_newdev;
 582
 583         /* Account for reference in struct vlan_dev_info */
 584         dev_hold(real_dev);
 585 #ifdef VLAN_DEBUG
 586         printk(VLAN_DBG "Allocated new device successfully, returning.\n");
 587 #endif
 588         return 0;
 589
 590 out_free_newdev:
 591         free_netdev(new_dev);
 592         return err;
 593 }
 594
 595 static int vlan_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
 596 {
 597         struct net_device *dev = ptr;
 598         struct vlan_group *grp = __vlan_find_group(dev->ifindex);
 599         int i, flgs;
 600         struct net_device *vlandev;
 601
 602         if (!grp)
 603                 goto out;
 604
 605         /* It is OK that we do not hold the group lock right now,
 606          * as we run under the RTNL lock.
 607          */
 608
 609         switch (event) {
 610         case NETDEV_CHANGE:
 611                 /* Propagate real device state to vlan devices */
 612                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 613                         vlandev = vlan_group_get_device(grp, i);
 614                         if (!vlandev)
 615                                 continue;
 616
 617                         vlan_transfer_operstate(dev, vlandev);
 618                 }
 619                 break;
 620
 621         case NETDEV_DOWN:
 622                 /* Put all VLANs for this dev in the down state too.  */
 623                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 624                         vlandev = vlan_group_get_device(grp, i);
 625                         if (!vlandev)
 626                                 continue;
 627
 628                         flgs = vlandev->flags;
 629                         if (!(flgs & IFF_UP))
 630                                 continue;
 631
 632                         dev_change_flags(vlandev, flgs & ~IFF_UP);
 633                 }
 634                 break;
 635
 636         case NETDEV_UP:
 637                 /* Put all VLANs for this dev in the up state too.  */
 638                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 639                         vlandev = vlan_group_get_device(grp, i);
 640                         if (!vlandev)
 641                                 continue;
 642
 643                         flgs = vlandev->flags;
 644                         if (flgs & IFF_UP)
 645                                 continue;
 646
 647                         dev_change_flags(vlandev, flgs | IFF_UP);
 648                 }
 649                 break;
 650
 651         case NETDEV_UNREGISTER:
 652                 /* Delete all VLANs for this dev. */
 653                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 654                         int ret;
 655
 656                         vlandev = vlan_group_get_device(grp, i);
 657                         if (!vlandev)
 658                                 continue;
 659
 660                         ret = unregister_vlan_dev(dev,
 661                                                   VLAN_DEV_INFO(vlandev)->vlan_id);
 662
 663                         unregister_netdevice(vlandev);
 664
 665                         /* Group was destroyed? */
 666                         if (ret == 1)
 667                                 break;
 668                 }
 669                 break;
 670         }
 671
 672 out:
 673         return NOTIFY_DONE;
 674 }
 675
 676 /*
 677  *      VLAN IOCTL handler.
 678  *      o execute requested action or pass command to the device driver
 679  *   arg is really a struct vlan_ioctl_args __user *.
 680  */
 681 static int vlan_ioctl_handler(void __user *arg)
 682 {
 683         int err;
 684         unsigned short vid = 0;
 685         struct vlan_ioctl_args args;
 686         struct net_device *dev = NULL;
 687
 688         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 689                 return -EFAULT;
 690
 691         /* Null terminate this sucker, just in case. */
 692         args.device1[23] = 0;
 693         args.u.device2[23] = 0;
 694
 695 #ifdef VLAN_DEBUG
 696         printk(VLAN_DBG "%s: args.cmd: %x\n", __FUNCTION__, args.cmd);
 697 #endif
 698
 699         rtnl_lock();
 700
 701         switch (args.cmd) {
 702         case SET_VLAN_INGRESS_PRIORITY_CMD:
 703         case SET_VLAN_EGRESS_PRIORITY_CMD:
 704         case SET_VLAN_FLAG_CMD:
 705         case ADD_VLAN_CMD:
 706         case DEL_VLAN_CMD:
 707         case GET_VLAN_REALDEV_NAME_CMD:
 708         case GET_VLAN_VID_CMD:
 709                 err = -ENODEV;
 710                 dev = __dev_get_by_name(args.device1);
 711                 if (!dev)
 712                         goto out;
 713
 714                 err = -EINVAL;
 715                 if (args.cmd != ADD_VLAN_CMD &&
 716                     !(dev->priv_flags & IFF_802_1Q_VLAN))
 717                         goto out;
 718         }
 719
 720         switch (args.cmd) {
 721         case SET_VLAN_INGRESS_PRIORITY_CMD:
 722                 err = -EPERM;
 723                 if (!capable(CAP_NET_ADMIN))
 724                         break;
 725                 vlan_dev_set_ingress_priority(dev,
 726                                               args.u.skb_priority,
 727                                               args.vlan_qos);
 728                 break;
 729
 730         case SET_VLAN_EGRESS_PRIORITY_CMD:
 731                 err = -EPERM;
 732                 if (!capable(CAP_NET_ADMIN))
 733                         break;
 734                 err = vlan_dev_set_egress_priority(dev,
 735                                                    args.u.skb_priority,
 736                                                    args.vlan_qos);
 737                 break;
 738
 739         case SET_VLAN_FLAG_CMD:
 740                 err = -EPERM;
 741                 if (!capable(CAP_NET_ADMIN))
 742                         break;
 743                 err = vlan_dev_set_vlan_flag(dev,
 744                                              args.u.flag,
 745                                              args.vlan_qos);
 746                 break;
 747
 748         case SET_VLAN_NAME_TYPE_CMD:
 749                 err = -EPERM;
 750                 if (!capable(CAP_NET_ADMIN))
 751                         return -EPERM;
 752                 if ((args.u.name_type >= 0) &&
 753                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
 754                         vlan_name_type = args.u.name_type;
 755                         err = 0;
 756                 } else {
 757                         err = -EINVAL;
 758                 }
 759                 break;
 760
 761         case ADD_VLAN_CMD:
 762                 err = -EPERM;
 763                 if (!capable(CAP_NET_ADMIN))
 764                         break;
 765                 err = register_vlan_device(dev, args.u.VID);
 766                 break;
 767
 768         case DEL_VLAN_CMD:
 769                 err = -EPERM;
 770                 if (!capable(CAP_NET_ADMIN))
 771                         break;
 772                 err = unregister_vlan_device(dev);
 773                 break;
 774
 775         case GET_VLAN_INGRESS_PRIORITY_CMD:
 776                 /* TODO:  Implement
 777                    err = vlan_dev_get_ingress_priority(args);
 778                    if (copy_to_user((void*)arg, &args,
 779                         sizeof(struct vlan_ioctl_args))) {
 780                         err = -EFAULT;
 781                    }
 782                 */
 783                 err = -EINVAL;
 784                 break;
 785         case GET_VLAN_EGRESS_PRIORITY_CMD:
 786                 /* TODO:  Implement
 787                    err = vlan_dev_get_egress_priority(args.device1, &(args.args);
 788                    if (copy_to_user((void*)arg, &args,
 789                         sizeof(struct vlan_ioctl_args))) {
 790                         err = -EFAULT;
 791                    }
 792                 */
 793                 err = -EINVAL;
 794                 break;
 795         case GET_VLAN_REALDEV_NAME_CMD:
 796                 vlan_dev_get_realdev_name(dev, args.u.device2);
 797                 if (copy_to_user(arg, &args,
 798                                  sizeof(struct vlan_ioctl_args))) {
 799                         err = -EFAULT;
 800                 }
 801                 break;
 802
 803         case GET_VLAN_VID_CMD:
 804                 vlan_dev_get_vid(dev, &vid);
 805                 args.u.VID = vid;
 806                 if (copy_to_user(arg, &args,
 807                                  sizeof(struct vlan_ioctl_args))) {
 808                       err = -EFAULT;
 809                 }
 810                 break;
 811
 812         default:
 813                 /* pass on to underlying device instead?? */
 814                 printk(VLAN_DBG "%s: Unknown VLAN CMD: %x \n",
 815                         __FUNCTION__, args.cmd);
 816                 err = -EINVAL;
 817                 break;
 818         }
 819 out:
 820         rtnl_unlock();
 821         return err;
 822 }
 823
 824 MODULE_LICENSE("GPL");
 825 MODULE_VERSION(DRV_VERSION);