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   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                 dev_remove_pack(&vlan_packet_type);
 102                 vlan_proc_cleanup();
 103                 return err;
 104         }
 105
 106         vlan_ioctl_set(vlan_ioctl_handler);
 107
 108         return 0;
 109 }
 110
 111 /* Cleanup all vlan devices
 112  * Note: devices that have been registered that but not
 113  * brought up will exist but have no module ref count.
 114  */
 115 static void __exit vlan_cleanup_devices(void)
 116 {
 117         struct net_device *dev, *nxt;
 118
 119         rtnl_lock();
 120         for_each_netdev_safe(dev, nxt) {
 121                 if (dev->priv_flags & IFF_802_1Q_VLAN) {
 122                         unregister_vlan_dev(VLAN_DEV_INFO(dev)->real_dev,
 123                                             VLAN_DEV_INFO(dev)->vlan_id);
 124
 125                         unregister_netdevice(dev);
 126                 }
 127         }
 128         rtnl_unlock();
 129 }
 130
 131 /*
 132  *     Module 'remove' entry point.
 133  *     o delete /proc/net/router directory and static entries.
 134  */
 135 static void __exit vlan_cleanup_module(void)
 136 {
 137         int i;
 138
 139         vlan_ioctl_set(NULL);
 140
 141         /* Un-register us from receiving netdevice events */
 142         unregister_netdevice_notifier(&vlan_notifier_block);
 143
 144         dev_remove_pack(&vlan_packet_type);
 145         vlan_cleanup_devices();
 146
 147         /* This table must be empty if there are no module
 148          * references left.
 149          */
 150         for (i = 0; i < VLAN_GRP_HASH_SIZE; i++) {
 151                 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
 152         }
 153         vlan_proc_cleanup();
 154
 155         synchronize_net();
 156 }
 157
 158 module_init(vlan_proto_init);
 159 module_exit(vlan_cleanup_module);
 160
 161 /* Must be invoked with RCU read lock (no preempt) */
 162 static struct vlan_group *__vlan_find_group(int real_dev_ifindex)
 163 {
 164         struct vlan_group *grp;
 165         struct hlist_node *n;
 166         int hash = vlan_grp_hashfn(real_dev_ifindex);
 167
 168         hlist_for_each_entry_rcu(grp, n, &vlan_group_hash[hash], hlist) {
 169                 if (grp->real_dev_ifindex == real_dev_ifindex)
 170                         return grp;
 171         }
 172
 173         return NULL;
 174 }
 175
 176 /*  Find the protocol handler.  Assumes VID < VLAN_VID_MASK.
 177  *
 178  * Must be invoked with RCU read lock (no preempt)
 179  */
 180 struct net_device *__find_vlan_dev(struct net_device *real_dev,
 181                                    unsigned short VID)
 182 {
 183         struct vlan_group *grp = __vlan_find_group(real_dev->ifindex);
 184
 185         if (grp)
 186                 return vlan_group_get_device(grp, VID);
 187
 188         return NULL;
 189 }
 190
 191 static void vlan_group_free(struct vlan_group *grp)
 192 {
 193         int i;
 194
 195         for (i=0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
 196                 kfree(grp->vlan_devices_arrays[i]);
 197         kfree(grp);
 198 }
 199
 200 static void vlan_rcu_free(struct rcu_head *rcu)
 201 {
 202         vlan_group_free(container_of(rcu, struct vlan_group, rcu));
 203 }
 204
 205
 206 /* This returns 0 if everything went fine.
 207  * It will return 1 if the group was killed as a result.
 208  * A negative return indicates failure.
 209  *
 210  * The RTNL lock must be held.
 211  */
 212 static int unregister_vlan_dev(struct net_device *real_dev,
 213                                unsigned short vlan_id)
 214 {
 215         struct net_device *dev = NULL;
 216         int real_dev_ifindex = real_dev->ifindex;
 217         struct vlan_group *grp;
 218         int i, ret;
 219
 220 #ifdef VLAN_DEBUG
 221         printk(VLAN_DBG "%s: VID: %i\n", __FUNCTION__, vlan_id);
 222 #endif
 223
 224         /* sanity check */
 225         if (vlan_id >= VLAN_VID_MASK)
 226                 return -EINVAL;
 227
 228         ASSERT_RTNL();
 229         grp = __vlan_find_group(real_dev_ifindex);
 230
 231         ret = 0;
 232
 233         if (grp) {
 234                 dev = vlan_group_get_device(grp, vlan_id);
 235                 if (dev) {
 236                         /* Remove proc entry */
 237                         vlan_proc_rem_dev(dev);
 238
 239                         /* Take it out of our own structures, but be sure to
 240                          * interlock with HW accelerating devices or SW vlan
 241                          * input packet processing.
 242                          */
 243                         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 244                                 real_dev->vlan_rx_kill_vid(real_dev, vlan_id);
 245
 246                         vlan_group_set_device(grp, vlan_id, NULL);
 247                         synchronize_net();
 248
 249
 250                         /* Caller unregisters (and if necessary, puts)
 251                          * VLAN device, but we get rid of the reference to
 252                          * real_dev here.
 253                          */
 254                         dev_put(real_dev);
 255
 256                         /* If the group is now empty, kill off the
 257                          * group.
 258                          */
 259                         for (i = 0; i < VLAN_VID_MASK; i++)
 260                                 if (vlan_group_get_device(grp, i))
 261                                         break;
 262
 263                         if (i == VLAN_VID_MASK) {
 264                                 if (real_dev->features & NETIF_F_HW_VLAN_RX)
 265                                         real_dev->vlan_rx_register(real_dev, NULL);
 266
 267                                 hlist_del_rcu(&grp->hlist);
 268
 269                                 /* Free the group, after all cpu's are done. */
 270                                 call_rcu(&grp->rcu, vlan_rcu_free);
 271
 272                                 grp = NULL;
 273                                 ret = 1;
 274                         }
 275                 }
 276         }
 277
 278         return ret;
 279 }
 280
 281 static int unregister_vlan_device(struct net_device *dev)
 282 {
 283         int ret;
 284
 285         ret = unregister_vlan_dev(VLAN_DEV_INFO(dev)->real_dev,
 286                                   VLAN_DEV_INFO(dev)->vlan_id);
 287         unregister_netdevice(dev);
 288
 289         if (ret == 1)
 290                 ret = 0;
 291         return ret;
 292 }
 293
 294 static void vlan_setup(struct net_device *new_dev)
 295 {
 296         SET_MODULE_OWNER(new_dev);
 297
 298         /* new_dev->ifindex = 0;  it will be set when added to
 299          * the global list.
 300          * iflink is set as well.
 301          */
 302         new_dev->get_stats = vlan_dev_get_stats;
 303
 304         /* Make this thing known as a VLAN device */
 305         new_dev->priv_flags |= IFF_802_1Q_VLAN;
 306
 307         /* Set us up to have no queue, as the underlying Hardware device
 308          * can do all the queueing we could want.
 309          */
 310         new_dev->tx_queue_len = 0;
 311
 312         /* set up method calls */
 313         new_dev->change_mtu = vlan_dev_change_mtu;
 314         new_dev->open = vlan_dev_open;
 315         new_dev->stop = vlan_dev_stop;
 316         new_dev->set_mac_address = vlan_dev_set_mac_address;
 317         new_dev->set_multicast_list = vlan_dev_set_multicast_list;
 318         new_dev->destructor = free_netdev;
 319         new_dev->do_ioctl = vlan_dev_ioctl;
 320 }
 321
 322 static void vlan_transfer_operstate(const struct net_device *dev, struct net_device *vlandev)
 323 {
 324         /* Have to respect userspace enforced dormant state
 325          * of real device, also must allow supplicant running
 326          * on VLAN device
 327          */
 328         if (dev->operstate == IF_OPER_DORMANT)
 329                 netif_dormant_on(vlandev);
 330         else
 331                 netif_dormant_off(vlandev);
 332
 333         if (netif_carrier_ok(dev)) {
 334                 if (!netif_carrier_ok(vlandev))
 335                         netif_carrier_on(vlandev);
 336         } else {
 337                 if (netif_carrier_ok(vlandev))
 338                         netif_carrier_off(vlandev);
 339         }
 340 }
 341
 342 /*
 343  * vlan network devices have devices nesting below it, and are a special
 344  * "super class" of normal network devices; split their locks off into a
 345  * separate class since they always nest.
 346  */
 347 static struct lock_class_key vlan_netdev_xmit_lock_key;
 348
 349
 350 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
 351  *  Returns the device that was created, or NULL if there was
 352  *  an error of some kind.
 353  */
 354 static struct net_device *register_vlan_device(struct net_device *real_dev,
 355                                                unsigned short VLAN_ID)
 356 {
 357         struct vlan_group *grp;
 358         struct net_device *new_dev;
 359         char name[IFNAMSIZ];
 360         int i;
 361
 362 #ifdef VLAN_DEBUG
 363         printk(VLAN_DBG "%s: if_name -:%s:-     vid: %i\n",
 364                 __FUNCTION__, eth_IF_name, VLAN_ID);
 365 #endif
 366
 367         if (VLAN_ID >= VLAN_VID_MASK)
 368                 goto out_ret_null;
 369
 370         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
 371                 printk(VLAN_DBG "%s: VLANs not supported on %s.\n",
 372                         __FUNCTION__, real_dev->name);
 373                 goto out_ret_null;
 374         }
 375
 376         if ((real_dev->features & NETIF_F_HW_VLAN_RX) &&
 377             !real_dev->vlan_rx_register) {
 378                 printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
 379                         __FUNCTION__, real_dev->name);
 380                 goto out_ret_null;
 381         }
 382
 383         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 384             (!real_dev->vlan_rx_add_vid || !real_dev->vlan_rx_kill_vid)) {
 385                 printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
 386                         __FUNCTION__, real_dev->name);
 387                 goto out_ret_null;
 388         }
 389
 390         /* The real device must be up and operating in order to
 391          * assosciate a VLAN device with it.
 392          */
 393         if (!(real_dev->flags & IFF_UP))
 394                 goto out_ret_null;
 395
 396         if (__find_vlan_dev(real_dev, VLAN_ID) != NULL) {
 397                 /* was already registered. */
 398                 printk(VLAN_DBG "%s: ALREADY had VLAN registered\n", __FUNCTION__);
 399                 goto out_ret_null;
 400         }
 401
 402         /* Gotta set up the fields for the device. */
 403 #ifdef VLAN_DEBUG
 404         printk(VLAN_DBG "About to allocate name, vlan_name_type: %i\n",
 405                vlan_name_type);
 406 #endif
 407         switch (vlan_name_type) {
 408         case VLAN_NAME_TYPE_RAW_PLUS_VID:
 409                 /* name will look like:  eth1.0005 */
 410                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, VLAN_ID);
 411                 break;
 412         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
 413                 /* Put our vlan.VID in the name.
 414                  * Name will look like:  vlan5
 415                  */
 416                 snprintf(name, IFNAMSIZ, "vlan%i", VLAN_ID);
 417                 break;
 418         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
 419                 /* Put our vlan.VID in the name.
 420                  * Name will look like:  eth0.5
 421                  */
 422                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, VLAN_ID);
 423                 break;
 424         case VLAN_NAME_TYPE_PLUS_VID:
 425                 /* Put our vlan.VID in the name.
 426                  * Name will look like:  vlan0005
 427                  */
 428         default:
 429                 snprintf(name, IFNAMSIZ, "vlan%.4i", VLAN_ID);
 430         }
 431
 432         new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
 433                                vlan_setup);
 434
 435         if (new_dev == NULL)
 436                 goto out_ret_null;
 437
 438 #ifdef VLAN_DEBUG
 439         printk(VLAN_DBG "Allocated new name -:%s:-\n", new_dev->name);
 440 #endif
 441         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
 442         new_dev->flags = real_dev->flags;
 443         new_dev->flags &= ~IFF_UP;
 444
 445         new_dev->state = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
 446                                              (1<<__LINK_STATE_DORMANT))) |
 447                          (1<<__LINK_STATE_PRESENT);
 448
 449         /* need 4 bytes for extra VLAN header info,
 450          * hope the underlying device can handle it.
 451          */
 452         new_dev->mtu = real_dev->mtu;
 453
 454         /* TODO: maybe just assign it to be ETHERNET? */
 455         new_dev->type = real_dev->type;
 456
 457         new_dev->hard_header_len = real_dev->hard_header_len;
 458         if (!(real_dev->features & NETIF_F_HW_VLAN_TX)) {
 459                 /* Regular ethernet + 4 bytes (18 total). */
 460                 new_dev->hard_header_len += VLAN_HLEN;
 461         }
 462
 463         VLAN_MEM_DBG("new_dev->priv malloc, addr: %p  size: %i\n",
 464                      new_dev->priv,
 465                      sizeof(struct vlan_dev_info));
 466
 467         memcpy(new_dev->broadcast, real_dev->broadcast, real_dev->addr_len);
 468         memcpy(new_dev->dev_addr, real_dev->dev_addr, real_dev->addr_len);
 469         new_dev->addr_len = real_dev->addr_len;
 470
 471         if (real_dev->features & NETIF_F_HW_VLAN_TX) {
 472                 new_dev->hard_header = real_dev->hard_header;
 473                 new_dev->hard_start_xmit = vlan_dev_hwaccel_hard_start_xmit;
 474                 new_dev->rebuild_header = real_dev->rebuild_header;
 475         } else {
 476                 new_dev->hard_header = vlan_dev_hard_header;
 477                 new_dev->hard_start_xmit = vlan_dev_hard_start_xmit;
 478                 new_dev->rebuild_header = vlan_dev_rebuild_header;
 479         }
 480         new_dev->hard_header_parse = real_dev->hard_header_parse;
 481
 482         VLAN_DEV_INFO(new_dev)->vlan_id = VLAN_ID; /* 1 through VLAN_VID_MASK */
 483         VLAN_DEV_INFO(new_dev)->real_dev = real_dev;
 484         VLAN_DEV_INFO(new_dev)->dent = NULL;
 485         VLAN_DEV_INFO(new_dev)->flags = 1;
 486
 487 #ifdef VLAN_DEBUG
 488         printk(VLAN_DBG "About to go find the group for idx: %i\n",
 489                real_dev->ifindex);
 490 #endif
 491
 492         if (register_netdevice(new_dev))
 493                 goto out_free_newdev;
 494
 495         lockdep_set_class(&new_dev->_xmit_lock, &vlan_netdev_xmit_lock_key);
 496
 497         new_dev->iflink = real_dev->ifindex;
 498         vlan_transfer_operstate(real_dev, new_dev);
 499         linkwatch_fire_event(new_dev); /* _MUST_ call rfc2863_policy() */
 500
 501         /* So, got the sucker initialized, now lets place
 502          * it into our local structure.
 503          */
 504         grp = __vlan_find_group(real_dev->ifindex);
 505
 506         /* Note, we are running under the RTNL semaphore
 507          * so it cannot "appear" on us.
 508          */
 509         if (!grp) { /* need to add a new group */
 510                 grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
 511                 if (!grp)
 512                         goto out_free_unregister;
 513
 514                 for (i=0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++) {
 515                         grp->vlan_devices_arrays[i] = kzalloc(
 516                                 sizeof(struct net_device *)*VLAN_GROUP_ARRAY_PART_LEN,
 517                                 GFP_KERNEL);
 518
 519                         if (!grp->vlan_devices_arrays[i])
 520                                 goto out_free_arrays;
 521                 }
 522
 523                 /* printk(KERN_ALERT "VLAN REGISTER:  Allocated new group.\n"); */
 524                 grp->real_dev_ifindex = real_dev->ifindex;
 525
 526                 hlist_add_head_rcu(&grp->hlist,
 527                                    &vlan_group_hash[vlan_grp_hashfn(real_dev->ifindex)]);
 528
 529                 if (real_dev->features & NETIF_F_HW_VLAN_RX)
 530                         real_dev->vlan_rx_register(real_dev, grp);
 531         }
 532
 533         vlan_group_set_device(grp, VLAN_ID, new_dev);
 534
 535         if (vlan_proc_add_dev(new_dev)<0)/* create it's proc entry */
 536                 printk(KERN_WARNING "VLAN: failed to add proc entry for %s\n",
 537                                                          new_dev->name);
 538
 539         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 540                 real_dev->vlan_rx_add_vid(real_dev, VLAN_ID);
 541
 542         /* Account for reference in struct vlan_dev_info */
 543         dev_hold(real_dev);
 544 #ifdef VLAN_DEBUG
 545         printk(VLAN_DBG "Allocated new device successfully, returning.\n");
 546 #endif
 547         return new_dev;
 548
 549 out_free_arrays:
 550         vlan_group_free(grp);
 551
 552 out_free_unregister:
 553         unregister_netdev(new_dev);
 554         goto out_ret_null;
 555
 556 out_free_newdev:
 557         free_netdev(new_dev);
 558
 559 out_ret_null:
 560         return NULL;
 561 }
 562
 563 static int vlan_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
 564 {
 565         struct net_device *dev = ptr;
 566         struct vlan_group *grp = __vlan_find_group(dev->ifindex);
 567         int i, flgs;
 568         struct net_device *vlandev;
 569
 570         if (!grp)
 571                 goto out;
 572
 573         /* It is OK that we do not hold the group lock right now,
 574          * as we run under the RTNL lock.
 575          */
 576
 577         switch (event) {
 578         case NETDEV_CHANGE:
 579                 /* Propagate real device state to vlan devices */
 580                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 581                         vlandev = vlan_group_get_device(grp, i);
 582                         if (!vlandev)
 583                                 continue;
 584
 585                         vlan_transfer_operstate(dev, vlandev);
 586                 }
 587                 break;
 588
 589         case NETDEV_DOWN:
 590                 /* Put all VLANs for this dev in the down state too.  */
 591                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 592                         vlandev = vlan_group_get_device(grp, i);
 593                         if (!vlandev)
 594                                 continue;
 595
 596                         flgs = vlandev->flags;
 597                         if (!(flgs & IFF_UP))
 598                                 continue;
 599
 600                         dev_change_flags(vlandev, flgs & ~IFF_UP);
 601                 }
 602                 break;
 603
 604         case NETDEV_UP:
 605                 /* Put all VLANs for this dev in the up state too.  */
 606                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 607                         vlandev = vlan_group_get_device(grp, i);
 608                         if (!vlandev)
 609                                 continue;
 610
 611                         flgs = vlandev->flags;
 612                         if (flgs & IFF_UP)
 613                                 continue;
 614
 615                         dev_change_flags(vlandev, flgs | IFF_UP);
 616                 }
 617                 break;
 618
 619         case NETDEV_UNREGISTER:
 620                 /* Delete all VLANs for this dev. */
 621                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 622                         int ret;
 623
 624                         vlandev = vlan_group_get_device(grp, i);
 625                         if (!vlandev)
 626                                 continue;
 627
 628                         ret = unregister_vlan_dev(dev,
 629                                                   VLAN_DEV_INFO(vlandev)->vlan_id);
 630
 631                         unregister_netdevice(vlandev);
 632
 633                         /* Group was destroyed? */
 634                         if (ret == 1)
 635                                 break;
 636                 }
 637                 break;
 638         }
 639
 640 out:
 641         return NOTIFY_DONE;
 642 }
 643
 644 /*
 645  *      VLAN IOCTL handler.
 646  *      o execute requested action or pass command to the device driver
 647  *   arg is really a struct vlan_ioctl_args __user *.
 648  */
 649 static int vlan_ioctl_handler(void __user *arg)
 650 {
 651         int err;
 652         unsigned short vid = 0;
 653         struct vlan_ioctl_args args;
 654         struct net_device *dev = NULL;
 655
 656         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 657                 return -EFAULT;
 658
 659         /* Null terminate this sucker, just in case. */
 660         args.device1[23] = 0;
 661         args.u.device2[23] = 0;
 662
 663 #ifdef VLAN_DEBUG
 664         printk(VLAN_DBG "%s: args.cmd: %x\n", __FUNCTION__, args.cmd);
 665 #endif
 666
 667         rtnl_lock();
 668
 669         switch (args.cmd) {
 670         case SET_VLAN_INGRESS_PRIORITY_CMD:
 671         case SET_VLAN_EGRESS_PRIORITY_CMD:
 672         case SET_VLAN_FLAG_CMD:
 673         case ADD_VLAN_CMD:
 674         case DEL_VLAN_CMD:
 675         case GET_VLAN_REALDEV_NAME_CMD:
 676         case GET_VLAN_VID_CMD:
 677                 err = -ENODEV;
 678                 dev = __dev_get_by_name(args.device1);
 679                 if (!dev)
 680                         goto out;
 681
 682                 err = -EINVAL;
 683                 if (args.cmd != ADD_VLAN_CMD &&
 684                     !(dev->priv_flags & IFF_802_1Q_VLAN))
 685                         goto out;
 686         }
 687
 688         switch (args.cmd) {
 689         case SET_VLAN_INGRESS_PRIORITY_CMD:
 690                 err = -EPERM;
 691                 if (!capable(CAP_NET_ADMIN))
 692                         break;
 693                 vlan_dev_set_ingress_priority(dev,
 694                                               args.u.skb_priority,
 695                                               args.vlan_qos);
 696                 break;
 697
 698         case SET_VLAN_EGRESS_PRIORITY_CMD:
 699                 err = -EPERM;
 700                 if (!capable(CAP_NET_ADMIN))
 701                         break;
 702                 err = vlan_dev_set_egress_priority(dev,
 703                                                    args.u.skb_priority,
 704                                                    args.vlan_qos);
 705                 break;
 706
 707         case SET_VLAN_FLAG_CMD:
 708                 err = -EPERM;
 709                 if (!capable(CAP_NET_ADMIN))
 710                         break;
 711                 err = vlan_dev_set_vlan_flag(dev,
 712                                              args.u.flag,
 713                                              args.vlan_qos);
 714                 break;
 715
 716         case SET_VLAN_NAME_TYPE_CMD:
 717                 err = -EPERM;
 718                 if (!capable(CAP_NET_ADMIN))
 719                         return -EPERM;
 720                 if ((args.u.name_type >= 0) &&
 721                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
 722                         vlan_name_type = args.u.name_type;
 723                         err = 0;
 724                 } else {
 725                         err = -EINVAL;
 726                 }
 727                 break;
 728
 729         case ADD_VLAN_CMD:
 730                 err = -EPERM;
 731                 if (!capable(CAP_NET_ADMIN))
 732                         break;
 733                 if (register_vlan_device(dev, args.u.VID)) {
 734                         err = 0;
 735                 } else {
 736                         err = -EINVAL;
 737                 }
 738                 break;
 739
 740         case DEL_VLAN_CMD:
 741                 err = -EPERM;
 742                 if (!capable(CAP_NET_ADMIN))
 743                         break;
 744                 err = unregister_vlan_device(dev);
 745                 break;
 746
 747         case GET_VLAN_INGRESS_PRIORITY_CMD:
 748                 /* TODO:  Implement
 749                    err = vlan_dev_get_ingress_priority(args);
 750                    if (copy_to_user((void*)arg, &args,
 751                         sizeof(struct vlan_ioctl_args))) {
 752                         err = -EFAULT;
 753                    }
 754                 */
 755                 err = -EINVAL;
 756                 break;
 757         case GET_VLAN_EGRESS_PRIORITY_CMD:
 758                 /* TODO:  Implement
 759                    err = vlan_dev_get_egress_priority(args.device1, &(args.args);
 760                    if (copy_to_user((void*)arg, &args,
 761                         sizeof(struct vlan_ioctl_args))) {
 762                         err = -EFAULT;
 763                    }
 764                 */
 765                 err = -EINVAL;
 766                 break;
 767         case GET_VLAN_REALDEV_NAME_CMD:
 768                 vlan_dev_get_realdev_name(dev, args.u.device2);
 769                 if (copy_to_user(arg, &args,
 770                                  sizeof(struct vlan_ioctl_args))) {
 771                         err = -EFAULT;
 772                 }
 773                 break;
 774
 775         case GET_VLAN_VID_CMD:
 776                 vlan_dev_get_vid(dev, &vid);
 777                 args.u.VID = vid;
 778                 if (copy_to_user(arg, &args,
 779                                  sizeof(struct vlan_ioctl_args))) {
 780                       err = -EFAULT;
 781                 }
 782                 break;
 783
 784         default:
 785                 /* pass on to underlying device instead?? */
 786                 printk(VLAN_DBG "%s: Unknown VLAN CMD: %x \n",
 787                         __FUNCTION__, args.cmd);
 788                 err = -EINVAL;
 789                 break;
 790         }
 791 out:
 792         rtnl_unlock();
 793         return err;
 794 }
 795
 796 MODULE_LICENSE("GPL");
 797 MODULE_VERSION(DRV_VERSION);