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 #include <net/net_namespace.h>
  35
  36 #include <linux/if_vlan.h>
  37 #include "vlan.h"
  38 #include "vlanproc.h"
  39
  40 #define DRV_VERSION "1.8"
  41
  42 /* Global VLAN variables */
  43
  44 /* Our listing of VLAN group(s) */
  45 static struct hlist_head vlan_group_hash[VLAN_GRP_HASH_SIZE];
  46 #define vlan_grp_hashfn(IDX)    ((((IDX) >> VLAN_GRP_HASH_SHIFT) ^ (IDX)) & VLAN_GRP_HASH_MASK)
  47
  48 static char vlan_fullname[] = "802.1Q VLAN Support";
  49 static char vlan_version[] = DRV_VERSION;
  50 static char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>";
  51 static char vlan_buggyright[] = "David S. Miller <davem@redhat.com>";
  52
  53 static int vlan_device_event(struct notifier_block *, unsigned long, void *);
  54 static int vlan_ioctl_handler(struct net *net, void __user *);
  55 static int unregister_vlan_dev(struct net_device *, unsigned short );
  56
  57 static struct notifier_block vlan_notifier_block = {
  58         .notifier_call = vlan_device_event,
  59 };
  60
  61 /* These may be changed at run-time through IOCTLs */
  62
  63 /* Determines interface naming scheme. */
  64 unsigned short vlan_name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
  65
  66 static struct packet_type vlan_packet_type = {
  67         .type = __constant_htons(ETH_P_8021Q),
  68         .func = vlan_skb_recv, /* VLAN receive method */
  69 };
  70
  71 /* End of global variables definitions. */
  72
  73 /*
  74  * Function vlan_proto_init (pro)
  75  *
  76  *    Initialize VLAN protocol layer,
  77  *
  78  */
  79 static int __init vlan_proto_init(void)
  80 {
  81         int err;
  82
  83         printk(VLAN_INF "%s v%s %s\n",
  84                vlan_fullname, vlan_version, vlan_copyright);
  85         printk(VLAN_INF "All bugs added by %s\n",
  86                vlan_buggyright);
  87
  88         /* proc file system initialization */
  89         err = vlan_proc_init();
  90         if (err < 0) {
  91                 printk(KERN_ERR
  92                        "%s %s: can't create entry in proc filesystem!\n",
  93                        __FUNCTION__, VLAN_NAME);
  94                 return err;
  95         }
  96
  97         dev_add_pack(&vlan_packet_type);
  98
  99         /* Register us to receive netdevice events */
 100         err = register_netdevice_notifier(&vlan_notifier_block);
 101         if (err < 0)
 102                 goto err1;
 103
 104         err = vlan_netlink_init();
 105         if (err < 0)
 106                 goto err2;
 107
 108         vlan_ioctl_set(vlan_ioctl_handler);
 109         return 0;
 110
 111 err2:
 112         unregister_netdevice_notifier(&vlan_notifier_block);
 113 err1:
 114         vlan_proc_cleanup();
 115         dev_remove_pack(&vlan_packet_type);
 116         return err;
 117 }
 118
 119 /*
 120  *     Module 'remove' entry point.
 121  *     o delete /proc/net/router directory and static entries.
 122  */
 123 static void __exit vlan_cleanup_module(void)
 124 {
 125         int i;
 126
 127         vlan_netlink_fini();
 128         vlan_ioctl_set(NULL);
 129
 130         /* Un-register us from receiving netdevice events */
 131         unregister_netdevice_notifier(&vlan_notifier_block);
 132
 133         dev_remove_pack(&vlan_packet_type);
 134
 135         /* This table must be empty if there are no module
 136          * references left.
 137          */
 138         for (i = 0; i < VLAN_GRP_HASH_SIZE; i++) {
 139                 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
 140         }
 141         vlan_proc_cleanup();
 142
 143         synchronize_net();
 144 }
 145
 146 module_init(vlan_proto_init);
 147 module_exit(vlan_cleanup_module);
 148
 149 /* Must be invoked with RCU read lock (no preempt) */
 150 static struct vlan_group *__vlan_find_group(int real_dev_ifindex)
 151 {
 152         struct vlan_group *grp;
 153         struct hlist_node *n;
 154         int hash = vlan_grp_hashfn(real_dev_ifindex);
 155
 156         hlist_for_each_entry_rcu(grp, n, &vlan_group_hash[hash], hlist) {
 157                 if (grp->real_dev_ifindex == real_dev_ifindex)
 158                         return grp;
 159         }
 160
 161         return NULL;
 162 }
 163
 164 /*  Find the protocol handler.  Assumes VID < VLAN_VID_MASK.
 165  *
 166  * Must be invoked with RCU read lock (no preempt)
 167  */
 168 struct net_device *__find_vlan_dev(struct net_device *real_dev,
 169                                    unsigned short VID)
 170 {
 171         struct vlan_group *grp = __vlan_find_group(real_dev->ifindex);
 172
 173         if (grp)
 174                 return vlan_group_get_device(grp, VID);
 175
 176         return NULL;
 177 }
 178
 179 static void vlan_group_free(struct vlan_group *grp)
 180 {
 181         int i;
 182
 183         for (i=0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
 184                 kfree(grp->vlan_devices_arrays[i]);
 185         kfree(grp);
 186 }
 187
 188 static struct vlan_group *vlan_group_alloc(int ifindex)
 189 {
 190         struct vlan_group *grp;
 191         unsigned int size;
 192         unsigned int i;
 193
 194         grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
 195         if (!grp)
 196                 return NULL;
 197
 198         size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
 199
 200         for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++) {
 201                 grp->vlan_devices_arrays[i] = kzalloc(size, GFP_KERNEL);
 202                 if (!grp->vlan_devices_arrays[i])
 203                         goto err;
 204         }
 205
 206         grp->real_dev_ifindex = ifindex;
 207         hlist_add_head_rcu(&grp->hlist,
 208                            &vlan_group_hash[vlan_grp_hashfn(ifindex)]);
 209         return grp;
 210
 211 err:
 212         vlan_group_free(grp);
 213         return NULL;
 214 }
 215
 216 static void vlan_rcu_free(struct rcu_head *rcu)
 217 {
 218         vlan_group_free(container_of(rcu, struct vlan_group, rcu));
 219 }
 220
 221
 222 /* This returns 0 if everything went fine.
 223  * It will return 1 if the group was killed as a result.
 224  * A negative return indicates failure.
 225  *
 226  * The RTNL lock must be held.
 227  */
 228 static int unregister_vlan_dev(struct net_device *real_dev,
 229                                unsigned short vlan_id)
 230 {
 231         struct net_device *dev = NULL;
 232         int real_dev_ifindex = real_dev->ifindex;
 233         struct vlan_group *grp;
 234         int i, ret;
 235
 236 #ifdef VLAN_DEBUG
 237         printk(VLAN_DBG "%s: VID: %i\n", __FUNCTION__, vlan_id);
 238 #endif
 239
 240         /* sanity check */
 241         if (vlan_id >= VLAN_VID_MASK)
 242                 return -EINVAL;
 243
 244         ASSERT_RTNL();
 245         grp = __vlan_find_group(real_dev_ifindex);
 246
 247         ret = 0;
 248
 249         if (grp) {
 250                 dev = vlan_group_get_device(grp, vlan_id);
 251                 if (dev) {
 252                         /* Remove proc entry */
 253                         vlan_proc_rem_dev(dev);
 254
 255                         /* Take it out of our own structures, but be sure to
 256                          * interlock with HW accelerating devices or SW vlan
 257                          * input packet processing.
 258                          */
 259                         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 260                                 real_dev->vlan_rx_kill_vid(real_dev, vlan_id);
 261
 262                         vlan_group_set_device(grp, vlan_id, NULL);
 263                         synchronize_net();
 264
 265
 266                         /* Caller unregisters (and if necessary, puts)
 267                          * VLAN device, but we get rid of the reference to
 268                          * real_dev here.
 269                          */
 270                         dev_put(real_dev);
 271
 272                         /* If the group is now empty, kill off the
 273                          * group.
 274                          */
 275                         for (i = 0; i < VLAN_VID_MASK; i++)
 276                                 if (vlan_group_get_device(grp, i))
 277                                         break;
 278
 279                         if (i == VLAN_VID_MASK) {
 280                                 if (real_dev->features & NETIF_F_HW_VLAN_RX)
 281                                         real_dev->vlan_rx_register(real_dev, NULL);
 282
 283                                 hlist_del_rcu(&grp->hlist);
 284
 285                                 /* Free the group, after all cpu's are done. */
 286                                 call_rcu(&grp->rcu, vlan_rcu_free);
 287
 288                                 grp = NULL;
 289                                 ret = 1;
 290                         }
 291                 }
 292         }
 293
 294         return ret;
 295 }
 296
 297 int unregister_vlan_device(struct net_device *dev)
 298 {
 299         int ret;
 300
 301         ret = unregister_vlan_dev(VLAN_DEV_INFO(dev)->real_dev,
 302                                   VLAN_DEV_INFO(dev)->vlan_id);
 303         unregister_netdevice(dev);
 304
 305         if (ret == 1)
 306                 ret = 0;
 307         return ret;
 308 }
 309
 310 /*
 311  * vlan network devices have devices nesting below it, and are a special
 312  * "super class" of normal network devices; split their locks off into a
 313  * separate class since they always nest.
 314  */
 315 static struct lock_class_key vlan_netdev_xmit_lock_key;
 316
 317 static const struct header_ops vlan_header_ops = {
 318         .create  = vlan_dev_hard_header,
 319         .rebuild = vlan_dev_rebuild_header,
 320         .parse   = eth_header_parse,
 321 };
 322
 323 static int vlan_dev_init(struct net_device *dev)
 324 {
 325         struct net_device *real_dev = VLAN_DEV_INFO(dev)->real_dev;
 326
 327         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
 328         dev->flags  = real_dev->flags & ~IFF_UP;
 329         dev->iflink = real_dev->ifindex;
 330         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
 331                                           (1<<__LINK_STATE_DORMANT))) |
 332                       (1<<__LINK_STATE_PRESENT);
 333
 334         if (is_zero_ether_addr(dev->dev_addr))
 335                 memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len);
 336         if (is_zero_ether_addr(dev->broadcast))
 337                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
 338
 339         if (real_dev->features & NETIF_F_HW_VLAN_TX) {
 340                 dev->header_ops      = real_dev->header_ops;
 341                 dev->hard_header_len = real_dev->hard_header_len;
 342                 dev->hard_start_xmit = vlan_dev_hwaccel_hard_start_xmit;
 343         } else {
 344                 dev->header_ops      = &vlan_header_ops;
 345                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
 346                 dev->hard_start_xmit = vlan_dev_hard_start_xmit;
 347         }
 348
 349         lockdep_set_class(&dev->_xmit_lock, &vlan_netdev_xmit_lock_key);
 350         return 0;
 351 }
 352
 353 void vlan_setup(struct net_device *new_dev)
 354 {
 355         ether_setup(new_dev);
 356
 357         /* new_dev->ifindex = 0;  it will be set when added to
 358          * the global list.
 359          * iflink is set as well.
 360          */
 361         new_dev->get_stats = vlan_dev_get_stats;
 362
 363         /* Make this thing known as a VLAN device */
 364         new_dev->priv_flags |= IFF_802_1Q_VLAN;
 365
 366         /* Set us up to have no queue, as the underlying Hardware device
 367          * can do all the queueing we could want.
 368          */
 369         new_dev->tx_queue_len = 0;
 370
 371         /* set up method calls */
 372         new_dev->change_mtu = vlan_dev_change_mtu;
 373         new_dev->init = vlan_dev_init;
 374         new_dev->open = vlan_dev_open;
 375         new_dev->stop = vlan_dev_stop;
 376         new_dev->set_multicast_list = vlan_dev_set_multicast_list;
 377         new_dev->change_rx_flags = vlan_change_rx_flags;
 378         new_dev->destructor = free_netdev;
 379         new_dev->do_ioctl = vlan_dev_ioctl;
 380
 381         memset(new_dev->broadcast, 0, ETH_ALEN);
 382 }
 383
 384 static void vlan_transfer_operstate(const struct net_device *dev, struct net_device *vlandev)
 385 {
 386         /* Have to respect userspace enforced dormant state
 387          * of real device, also must allow supplicant running
 388          * on VLAN device
 389          */
 390         if (dev->operstate == IF_OPER_DORMANT)
 391                 netif_dormant_on(vlandev);
 392         else
 393                 netif_dormant_off(vlandev);
 394
 395         if (netif_carrier_ok(dev)) {
 396                 if (!netif_carrier_ok(vlandev))
 397                         netif_carrier_on(vlandev);
 398         } else {
 399                 if (netif_carrier_ok(vlandev))
 400                         netif_carrier_off(vlandev);
 401         }
 402 }
 403
 404 int vlan_check_real_dev(struct net_device *real_dev, unsigned short vlan_id)
 405 {
 406         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
 407                 printk(VLAN_DBG "%s: VLANs not supported on %s.\n",
 408                         __FUNCTION__, real_dev->name);
 409                 return -EOPNOTSUPP;
 410         }
 411
 412         if ((real_dev->features & NETIF_F_HW_VLAN_RX) &&
 413             !real_dev->vlan_rx_register) {
 414                 printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
 415                         __FUNCTION__, real_dev->name);
 416                 return -EOPNOTSUPP;
 417         }
 418
 419         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 420             (!real_dev->vlan_rx_add_vid || !real_dev->vlan_rx_kill_vid)) {
 421                 printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
 422                         __FUNCTION__, real_dev->name);
 423                 return -EOPNOTSUPP;
 424         }
 425
 426         /* The real device must be up and operating in order to
 427          * assosciate a VLAN device with it.
 428          */
 429         if (!(real_dev->flags & IFF_UP))
 430                 return -ENETDOWN;
 431
 432         if (__find_vlan_dev(real_dev, vlan_id) != NULL) {
 433                 /* was already registered. */
 434                 printk(VLAN_DBG "%s: ALREADY had VLAN registered\n", __FUNCTION__);
 435                 return -EEXIST;
 436         }
 437
 438         return 0;
 439 }
 440
 441 int register_vlan_dev(struct net_device *dev)
 442 {
 443         struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev);
 444         struct net_device *real_dev = vlan->real_dev;
 445         unsigned short vlan_id = vlan->vlan_id;
 446         struct vlan_group *grp, *ngrp = NULL;
 447         int err;
 448
 449         grp = __vlan_find_group(real_dev->ifindex);
 450         if (!grp) {
 451                 ngrp = grp = vlan_group_alloc(real_dev->ifindex);
 452                 if (!grp)
 453                         return -ENOBUFS;
 454         }
 455
 456         err = register_netdevice(dev);
 457         if (err < 0)
 458                 goto out_free_group;
 459
 460         /* Account for reference in struct vlan_dev_info */
 461         dev_hold(real_dev);
 462
 463         vlan_transfer_operstate(real_dev, dev);
 464         linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
 465
 466         /* So, got the sucker initialized, now lets place
 467          * it into our local structure.
 468          */
 469         vlan_group_set_device(grp, vlan_id, dev);
 470         if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX)
 471                 real_dev->vlan_rx_register(real_dev, ngrp);
 472         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 473                 real_dev->vlan_rx_add_vid(real_dev, vlan_id);
 474
 475         if (vlan_proc_add_dev(dev) < 0)
 476                 printk(KERN_WARNING "VLAN: failed to add proc entry for %s\n",
 477                        dev->name);
 478         return 0;
 479
 480 out_free_group:
 481         if (ngrp)
 482                 vlan_group_free(ngrp);
 483         return err;
 484 }
 485
 486 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
 487  *  Returns 0 if the device was created or a negative error code otherwise.
 488  */
 489 static int register_vlan_device(struct net_device *real_dev,
 490                                 unsigned short VLAN_ID)
 491 {
 492         struct net_device *new_dev;
 493         char name[IFNAMSIZ];
 494         int err;
 495
 496 #ifdef VLAN_DEBUG
 497         printk(VLAN_DBG "%s: if_name -:%s:-     vid: %i\n",
 498                 __FUNCTION__, eth_IF_name, VLAN_ID);
 499 #endif
 500
 501         if (VLAN_ID >= VLAN_VID_MASK)
 502                 return -ERANGE;
 503
 504         err = vlan_check_real_dev(real_dev, VLAN_ID);
 505         if (err < 0)
 506                 return err;
 507
 508         /* Gotta set up the fields for the device. */
 509 #ifdef VLAN_DEBUG
 510         printk(VLAN_DBG "About to allocate name, vlan_name_type: %i\n",
 511                vlan_name_type);
 512 #endif
 513         switch (vlan_name_type) {
 514         case VLAN_NAME_TYPE_RAW_PLUS_VID:
 515                 /* name will look like:  eth1.0005 */
 516                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, VLAN_ID);
 517                 break;
 518         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
 519                 /* Put our vlan.VID in the name.
 520                  * Name will look like:  vlan5
 521                  */
 522                 snprintf(name, IFNAMSIZ, "vlan%i", VLAN_ID);
 523                 break;
 524         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
 525                 /* Put our vlan.VID in the name.
 526                  * Name will look like:  eth0.5
 527                  */
 528                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, VLAN_ID);
 529                 break;
 530         case VLAN_NAME_TYPE_PLUS_VID:
 531                 /* Put our vlan.VID in the name.
 532                  * Name will look like:  vlan0005
 533                  */
 534         default:
 535                 snprintf(name, IFNAMSIZ, "vlan%.4i", VLAN_ID);
 536         }
 537
 538         new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
 539                                vlan_setup);
 540
 541         if (new_dev == NULL)
 542                 return -ENOBUFS;
 543
 544         /* need 4 bytes for extra VLAN header info,
 545          * hope the underlying device can handle it.
 546          */
 547         new_dev->mtu = real_dev->mtu;
 548
 549 #ifdef VLAN_DEBUG
 550         printk(VLAN_DBG "Allocated new name -:%s:-\n", new_dev->name);
 551         VLAN_MEM_DBG("new_dev->priv malloc, addr: %p  size: %i\n",
 552                      new_dev->priv,
 553                      sizeof(struct vlan_dev_info));
 554 #endif
 555
 556         VLAN_DEV_INFO(new_dev)->vlan_id = VLAN_ID; /* 1 through VLAN_VID_MASK */
 557         VLAN_DEV_INFO(new_dev)->real_dev = real_dev;
 558         VLAN_DEV_INFO(new_dev)->dent = NULL;
 559         VLAN_DEV_INFO(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
 560
 561         new_dev->rtnl_link_ops = &vlan_link_ops;
 562         err = register_vlan_dev(new_dev);
 563         if (err < 0)
 564                 goto out_free_newdev;
 565
 566 #ifdef VLAN_DEBUG
 567         printk(VLAN_DBG "Allocated new device successfully, returning.\n");
 568 #endif
 569         return 0;
 570
 571 out_free_newdev:
 572         free_netdev(new_dev);
 573         return err;
 574 }
 575
 576 static void vlan_sync_address(struct net_device *dev,
 577                               struct net_device *vlandev)
 578 {
 579         struct vlan_dev_info *vlan = VLAN_DEV_INFO(vlandev);
 580
 581         /* May be called without an actual change */
 582         if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
 583                 return;
 584
 585         /* vlan address was different from the old address and is equal to
 586          * the new address */
 587         if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
 588             !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
 589                 dev_unicast_delete(dev, vlandev->dev_addr, ETH_ALEN);
 590
 591         /* vlan address was equal to the old address and is different from
 592          * the new address */
 593         if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
 594             compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
 595                 dev_unicast_add(dev, vlandev->dev_addr, ETH_ALEN);
 596
 597         memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
 598 }
 599
 600 static int vlan_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
 601 {
 602         struct net_device *dev = ptr;
 603         struct vlan_group *grp = __vlan_find_group(dev->ifindex);
 604         int i, flgs;
 605         struct net_device *vlandev;
 606
 607         if (dev->nd_net != &init_net)
 608                 return NOTIFY_DONE;
 609
 610         if (!grp)
 611                 goto out;
 612
 613         /* It is OK that we do not hold the group lock right now,
 614          * as we run under the RTNL lock.
 615          */
 616
 617         switch (event) {
 618         case NETDEV_CHANGE:
 619                 /* Propagate real device state to vlan devices */
 620                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 621                         vlandev = vlan_group_get_device(grp, i);
 622                         if (!vlandev)
 623                                 continue;
 624
 625                         vlan_transfer_operstate(dev, vlandev);
 626                 }
 627                 break;
 628
 629         case NETDEV_CHANGEADDR:
 630                 /* Adjust unicast filters on underlying device */
 631                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 632                         vlandev = vlan_group_get_device(grp, i);
 633                         if (!vlandev)
 634                                 continue;
 635
 636                         vlan_sync_address(dev, vlandev);
 637                 }
 638                 break;
 639
 640         case NETDEV_DOWN:
 641                 /* Put all VLANs for this dev in the down state too.  */
 642                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 643                         vlandev = vlan_group_get_device(grp, i);
 644                         if (!vlandev)
 645                                 continue;
 646
 647                         flgs = vlandev->flags;
 648                         if (!(flgs & IFF_UP))
 649                                 continue;
 650
 651                         dev_change_flags(vlandev, flgs & ~IFF_UP);
 652                 }
 653                 break;
 654
 655         case NETDEV_UP:
 656                 /* Put all VLANs for this dev in the up state too.  */
 657                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 658                         vlandev = vlan_group_get_device(grp, i);
 659                         if (!vlandev)
 660                                 continue;
 661
 662                         flgs = vlandev->flags;
 663                         if (flgs & IFF_UP)
 664                                 continue;
 665
 666                         dev_change_flags(vlandev, flgs | IFF_UP);
 667                 }
 668                 break;
 669
 670         case NETDEV_UNREGISTER:
 671                 /* Delete all VLANs for this dev. */
 672                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 673                         int ret;
 674
 675                         vlandev = vlan_group_get_device(grp, i);
 676                         if (!vlandev)
 677                                 continue;
 678
 679                         ret = unregister_vlan_dev(dev,
 680                                                   VLAN_DEV_INFO(vlandev)->vlan_id);
 681
 682                         unregister_netdevice(vlandev);
 683
 684                         /* Group was destroyed? */
 685                         if (ret == 1)
 686                                 break;
 687                 }
 688                 break;
 689         }
 690
 691 out:
 692         return NOTIFY_DONE;
 693 }
 694
 695 /*
 696  *      VLAN IOCTL handler.
 697  *      o execute requested action or pass command to the device driver
 698  *   arg is really a struct vlan_ioctl_args __user *.
 699  */
 700 static int vlan_ioctl_handler(struct net *net, void __user *arg)
 701 {
 702         int err;
 703         unsigned short vid = 0;
 704         struct vlan_ioctl_args args;
 705         struct net_device *dev = NULL;
 706
 707         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 708                 return -EFAULT;
 709
 710         /* Null terminate this sucker, just in case. */
 711         args.device1[23] = 0;
 712         args.u.device2[23] = 0;
 713
 714 #ifdef VLAN_DEBUG
 715         printk(VLAN_DBG "%s: args.cmd: %x\n", __FUNCTION__, args.cmd);
 716 #endif
 717
 718         rtnl_lock();
 719
 720         switch (args.cmd) {
 721         case SET_VLAN_INGRESS_PRIORITY_CMD:
 722         case SET_VLAN_EGRESS_PRIORITY_CMD:
 723         case SET_VLAN_FLAG_CMD:
 724         case ADD_VLAN_CMD:
 725         case DEL_VLAN_CMD:
 726         case GET_VLAN_REALDEV_NAME_CMD:
 727         case GET_VLAN_VID_CMD:
 728                 err = -ENODEV;
 729                 dev = __dev_get_by_name(&init_net, args.device1);
 730                 if (!dev)
 731                         goto out;
 732
 733                 err = -EINVAL;
 734                 if (args.cmd != ADD_VLAN_CMD &&
 735                     !(dev->priv_flags & IFF_802_1Q_VLAN))
 736                         goto out;
 737         }
 738
 739         switch (args.cmd) {
 740         case SET_VLAN_INGRESS_PRIORITY_CMD:
 741                 err = -EPERM;
 742                 if (!capable(CAP_NET_ADMIN))
 743                         break;
 744                 vlan_dev_set_ingress_priority(dev,
 745                                               args.u.skb_priority,
 746                                               args.vlan_qos);
 747                 break;
 748
 749         case SET_VLAN_EGRESS_PRIORITY_CMD:
 750                 err = -EPERM;
 751                 if (!capable(CAP_NET_ADMIN))
 752                         break;
 753                 err = vlan_dev_set_egress_priority(dev,
 754                                                    args.u.skb_priority,
 755                                                    args.vlan_qos);
 756                 break;
 757
 758         case SET_VLAN_FLAG_CMD:
 759                 err = -EPERM;
 760                 if (!capable(CAP_NET_ADMIN))
 761                         break;
 762                 err = vlan_dev_set_vlan_flag(dev,
 763                                              args.u.flag,
 764                                              args.vlan_qos);
 765                 break;
 766
 767         case SET_VLAN_NAME_TYPE_CMD:
 768                 err = -EPERM;
 769                 if (!capable(CAP_NET_ADMIN))
 770                         return -EPERM;
 771                 if ((args.u.name_type >= 0) &&
 772                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
 773                         vlan_name_type = args.u.name_type;
 774                         err = 0;
 775                 } else {
 776                         err = -EINVAL;
 777                 }
 778                 break;
 779
 780         case ADD_VLAN_CMD:
 781                 err = -EPERM;
 782                 if (!capable(CAP_NET_ADMIN))
 783                         break;
 784                 err = register_vlan_device(dev, args.u.VID);
 785                 break;
 786
 787         case DEL_VLAN_CMD:
 788                 err = -EPERM;
 789                 if (!capable(CAP_NET_ADMIN))
 790                         break;
 791                 err = unregister_vlan_device(dev);
 792                 break;
 793
 794         case GET_VLAN_INGRESS_PRIORITY_CMD:
 795                 /* TODO:  Implement
 796                    err = vlan_dev_get_ingress_priority(args);
 797                    if (copy_to_user((void*)arg, &args,
 798                         sizeof(struct vlan_ioctl_args))) {
 799                         err = -EFAULT;
 800                    }
 801                 */
 802                 err = -EINVAL;
 803                 break;
 804         case GET_VLAN_EGRESS_PRIORITY_CMD:
 805                 /* TODO:  Implement
 806                    err = vlan_dev_get_egress_priority(args.device1, &(args.args);
 807                    if (copy_to_user((void*)arg, &args,
 808                         sizeof(struct vlan_ioctl_args))) {
 809                         err = -EFAULT;
 810                    }
 811                 */
 812                 err = -EINVAL;
 813                 break;
 814         case GET_VLAN_REALDEV_NAME_CMD:
 815                 err = 0;
 816                 vlan_dev_get_realdev_name(dev, args.u.device2);
 817                 if (copy_to_user(arg, &args,
 818                                  sizeof(struct vlan_ioctl_args))) {
 819                         err = -EFAULT;
 820                 }
 821                 break;
 822
 823         case GET_VLAN_VID_CMD:
 824                 err = 0;
 825                 vlan_dev_get_vid(dev, &vid);
 826                 args.u.VID = vid;
 827                 if (copy_to_user(arg, &args,
 828                                  sizeof(struct vlan_ioctl_args))) {
 829                       err = -EFAULT;
 830                 }
 831                 break;
 832
 833         default:
 834                 /* pass on to underlying device instead?? */
 835                 printk(VLAN_DBG "%s: Unknown VLAN CMD: %x \n",
 836                         __FUNCTION__, args.cmd);
 837                 err = -EINVAL;
 838                 break;
 839         }
 840 out:
 841         rtnl_unlock();
 842         return err;
 843 }
 844
 845 MODULE_LICENSE("GPL");
 846 MODULE_VERSION(DRV_VERSION);