blob: 0fadbc6fbc3f504c0c2cb4064fe3d2730ced8e6b [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +09008 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 * 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 */
Randy Dunlap4fc268d2006-01-11 12:17:47 -080022#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#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>
Eric W. Biedermane9dc8652007-09-12 13:02:17 +020034#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
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) */
45static 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
48static char vlan_fullname[] = "802.1Q VLAN Support";
49static char vlan_version[] = DRV_VERSION;
50static char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>";
51static char vlan_buggyright[] = "David S. Miller <davem@redhat.com>";
52
53static int vlan_device_event(struct notifier_block *, unsigned long, void *);
Eric W. Biederman881d9662007-09-17 11:56:21 -070054static int vlan_ioctl_handler(struct net *net, void __user *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070055static int unregister_vlan_dev(struct net_device *, unsigned short );
56
57static 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. */
64unsigned short vlan_name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
65
66static struct packet_type vlan_packet_type = {
67 .type = __constant_htons(ETH_P_8021Q),
68 .func = vlan_skb_recv, /* VLAN receive method */
69};
70
Linus Torvalds1da177e2005-04-16 15:20:36 -070071/* End of global variables definitions. */
72
73/*
74 * Function vlan_proto_init (pro)
75 *
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +090076 * Initialize VLAN protocol layer,
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 *
78 */
79static 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) {
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +090091 printk(KERN_ERR
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 "%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);
Patrick McHardy07b5b172007-06-13 12:07:54 -0700101 if (err < 0)
102 goto err1;
103
104 err = vlan_netlink_init();
105 if (err < 0)
106 goto err2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107
108 vlan_ioctl_set(vlan_ioctl_handler);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 return 0;
Patrick McHardy07b5b172007-06-13 12:07:54 -0700110
111err2:
112 unregister_netdevice_notifier(&vlan_notifier_block);
113err1:
114 vlan_proc_cleanup();
115 dev_remove_pack(&vlan_packet_type);
116 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117}
118
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119/*
120 * Module 'remove' entry point.
121 * o delete /proc/net/router directory and static entries.
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +0900122 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123static void __exit vlan_cleanup_module(void)
124{
125 int i;
126
Patrick McHardy07b5b172007-06-13 12:07:54 -0700127 vlan_netlink_fini();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134
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
146module_init(vlan_proto_init);
147module_exit(vlan_cleanup_module);
148
149/* Must be invoked with RCU read lock (no preempt) */
150static 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 */
168struct 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)
Dan Aloni5c15bde2007-03-02 20:44:51 -0800174 return vlan_group_get_device(grp, VID);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175
176 return NULL;
177}
178
Dan Aloni5c15bde2007-03-02 20:44:51 -0800179static 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
Patrick McHardy42429aa2007-06-13 12:05:59 -0700188static 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
211err:
212 vlan_group_free(grp);
213 return NULL;
214}
215
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216static void vlan_rcu_free(struct rcu_head *rcu)
217{
Dan Aloni5c15bde2007-03-02 20:44:51 -0800218 vlan_group_free(container_of(rcu, struct vlan_group, rcu));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219}
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 */
228static 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) {
Dan Aloni5c15bde2007-03-02 20:44:51 -0800250 dev = vlan_group_get_device(grp, vlan_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 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 */
Stephen Hemmingerd2d1acd2007-06-01 09:43:57 -0700259 if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 real_dev->vlan_rx_kill_vid(real_dev, vlan_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261
Dan Aloni5c15bde2007-03-02 20:44:51 -0800262 vlan_group_set_device(grp, vlan_id, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 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++)
Dan Aloni5c15bde2007-03-02 20:44:51 -0800276 if (vlan_group_get_device(grp, i))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 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
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +0900294 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295}
296
Patrick McHardy07b5b172007-06-13 12:07:54 -0700297int unregister_vlan_device(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 int ret;
300
Patrick McHardyc17d8872007-06-13 12:05:22 -0700301 ret = unregister_vlan_dev(VLAN_DEV_INFO(dev)->real_dev,
302 VLAN_DEV_INFO(dev)->vlan_id);
303 unregister_netdevice(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304
Patrick McHardyc17d8872007-06-13 12:05:22 -0700305 if (ret == 1)
306 ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 return ret;
308}
309
Patrick McHardy2f4284a2007-06-13 12:05:41 -0700310/*
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 */
315static struct lock_class_key vlan_netdev_xmit_lock_key;
316
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700317static 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
Patrick McHardy2f4284a2007-06-13 12:05:41 -0700323static 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
Ursula Braun3607c442007-10-08 20:28:47 -0700334 /* ipv6 shared card related stuff */
335 dev->dev_id = real_dev->dev_id;
336
Patrick McHardy0e068772007-07-11 19:42:31 -0700337 if (is_zero_ether_addr(dev->dev_addr))
338 memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len);
339 if (is_zero_ether_addr(dev->broadcast))
340 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
Patrick McHardy2f4284a2007-06-13 12:05:41 -0700341
342 if (real_dev->features & NETIF_F_HW_VLAN_TX) {
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700343 dev->header_ops = real_dev->header_ops;
Patrick McHardy2f4284a2007-06-13 12:05:41 -0700344 dev->hard_header_len = real_dev->hard_header_len;
345 dev->hard_start_xmit = vlan_dev_hwaccel_hard_start_xmit;
Patrick McHardy2f4284a2007-06-13 12:05:41 -0700346 } else {
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700347 dev->header_ops = &vlan_header_ops;
Patrick McHardy2f4284a2007-06-13 12:05:41 -0700348 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
349 dev->hard_start_xmit = vlan_dev_hard_start_xmit;
Patrick McHardy2f4284a2007-06-13 12:05:41 -0700350 }
Patrick McHardy2f4284a2007-06-13 12:05:41 -0700351
352 lockdep_set_class(&dev->_xmit_lock, &vlan_netdev_xmit_lock_key);
353 return 0;
354}
355
Patrick McHardy07b5b172007-06-13 12:07:54 -0700356void vlan_setup(struct net_device *new_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357{
Patrick McHardy8c979c22007-07-11 19:45:24 -0700358 ether_setup(new_dev);
359
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 /* new_dev->ifindex = 0; it will be set when added to
361 * the global list.
362 * iflink is set as well.
363 */
364 new_dev->get_stats = vlan_dev_get_stats;
365
366 /* Make this thing known as a VLAN device */
367 new_dev->priv_flags |= IFF_802_1Q_VLAN;
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +0900368
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 /* Set us up to have no queue, as the underlying Hardware device
370 * can do all the queueing we could want.
371 */
372 new_dev->tx_queue_len = 0;
373
374 /* set up method calls */
375 new_dev->change_mtu = vlan_dev_change_mtu;
Patrick McHardy2f4284a2007-06-13 12:05:41 -0700376 new_dev->init = vlan_dev_init;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 new_dev->open = vlan_dev_open;
378 new_dev->stop = vlan_dev_stop;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 new_dev->set_multicast_list = vlan_dev_set_multicast_list;
Patrick McHardy6c78dcb2007-07-14 18:52:56 -0700380 new_dev->change_rx_flags = vlan_change_rx_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 new_dev->destructor = free_netdev;
382 new_dev->do_ioctl = vlan_dev_ioctl;
Patrick McHardy0e068772007-07-11 19:42:31 -0700383
Patrick McHardya7ecfc82007-07-14 18:56:30 -0700384 memset(new_dev->broadcast, 0, ETH_ALEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385}
386
Stefan Rompfddd7bf92006-03-20 17:11:41 -0800387static void vlan_transfer_operstate(const struct net_device *dev, struct net_device *vlandev)
388{
389 /* Have to respect userspace enforced dormant state
390 * of real device, also must allow supplicant running
391 * on VLAN device
392 */
393 if (dev->operstate == IF_OPER_DORMANT)
394 netif_dormant_on(vlandev);
395 else
396 netif_dormant_off(vlandev);
397
398 if (netif_carrier_ok(dev)) {
399 if (!netif_carrier_ok(vlandev))
400 netif_carrier_on(vlandev);
401 } else {
402 if (netif_carrier_ok(vlandev))
403 netif_carrier_off(vlandev);
404 }
405}
406
Patrick McHardy07b5b172007-06-13 12:07:54 -0700407int vlan_check_real_dev(struct net_device *real_dev, unsigned short vlan_id)
Patrick McHardyc1d3ee92007-06-13 12:06:14 -0700408{
409 if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
410 printk(VLAN_DBG "%s: VLANs not supported on %s.\n",
411 __FUNCTION__, real_dev->name);
412 return -EOPNOTSUPP;
413 }
414
415 if ((real_dev->features & NETIF_F_HW_VLAN_RX) &&
416 !real_dev->vlan_rx_register) {
417 printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
418 __FUNCTION__, real_dev->name);
419 return -EOPNOTSUPP;
420 }
421
422 if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
423 (!real_dev->vlan_rx_add_vid || !real_dev->vlan_rx_kill_vid)) {
424 printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
425 __FUNCTION__, real_dev->name);
426 return -EOPNOTSUPP;
427 }
428
429 /* The real device must be up and operating in order to
430 * assosciate a VLAN device with it.
431 */
432 if (!(real_dev->flags & IFF_UP))
433 return -ENETDOWN;
434
435 if (__find_vlan_dev(real_dev, vlan_id) != NULL) {
436 /* was already registered. */
437 printk(VLAN_DBG "%s: ALREADY had VLAN registered\n", __FUNCTION__);
438 return -EEXIST;
439 }
440
441 return 0;
442}
443
Patrick McHardy07b5b172007-06-13 12:07:54 -0700444int register_vlan_dev(struct net_device *dev)
Patrick McHardye89fe422007-06-13 12:06:29 -0700445{
446 struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev);
447 struct net_device *real_dev = vlan->real_dev;
448 unsigned short vlan_id = vlan->vlan_id;
449 struct vlan_group *grp, *ngrp = NULL;
450 int err;
451
452 grp = __vlan_find_group(real_dev->ifindex);
453 if (!grp) {
454 ngrp = grp = vlan_group_alloc(real_dev->ifindex);
455 if (!grp)
456 return -ENOBUFS;
457 }
458
459 err = register_netdevice(dev);
460 if (err < 0)
461 goto out_free_group;
462
463 /* Account for reference in struct vlan_dev_info */
464 dev_hold(real_dev);
465
466 vlan_transfer_operstate(real_dev, dev);
467 linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
468
469 /* So, got the sucker initialized, now lets place
470 * it into our local structure.
471 */
472 vlan_group_set_device(grp, vlan_id, dev);
473 if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX)
474 real_dev->vlan_rx_register(real_dev, ngrp);
475 if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
476 real_dev->vlan_rx_add_vid(real_dev, vlan_id);
477
478 if (vlan_proc_add_dev(dev) < 0)
479 printk(KERN_WARNING "VLAN: failed to add proc entry for %s\n",
480 dev->name);
481 return 0;
482
483out_free_group:
484 if (ngrp)
485 vlan_group_free(ngrp);
486 return err;
487}
488
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489/* Attach a VLAN device to a mac address (ie Ethernet Card).
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700490 * Returns 0 if the device was created or a negative error code otherwise.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491 */
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700492static int register_vlan_device(struct net_device *real_dev,
493 unsigned short VLAN_ID)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 struct net_device *new_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 char name[IFNAMSIZ];
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700497 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498
499#ifdef VLAN_DEBUG
500 printk(VLAN_DBG "%s: if_name -:%s:- vid: %i\n",
501 __FUNCTION__, eth_IF_name, VLAN_ID);
502#endif
503
504 if (VLAN_ID >= VLAN_VID_MASK)
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700505 return -ERANGE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700507 err = vlan_check_real_dev(real_dev, VLAN_ID);
508 if (err < 0)
509 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510
511 /* Gotta set up the fields for the device. */
512#ifdef VLAN_DEBUG
513 printk(VLAN_DBG "About to allocate name, vlan_name_type: %i\n",
514 vlan_name_type);
515#endif
516 switch (vlan_name_type) {
517 case VLAN_NAME_TYPE_RAW_PLUS_VID:
518 /* name will look like: eth1.0005 */
519 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, VLAN_ID);
520 break;
521 case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
522 /* Put our vlan.VID in the name.
523 * Name will look like: vlan5
524 */
525 snprintf(name, IFNAMSIZ, "vlan%i", VLAN_ID);
526 break;
527 case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
528 /* Put our vlan.VID in the name.
529 * Name will look like: eth0.5
530 */
531 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, VLAN_ID);
532 break;
533 case VLAN_NAME_TYPE_PLUS_VID:
534 /* Put our vlan.VID in the name.
535 * Name will look like: vlan0005
536 */
537 default:
538 snprintf(name, IFNAMSIZ, "vlan%.4i", VLAN_ID);
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700539 }
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +0900540
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
542 vlan_setup);
Arjan van de Ven5dd8d1e2006-07-03 00:25:33 -0700543
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 if (new_dev == NULL)
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700545 return -ENOBUFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 /* need 4 bytes for extra VLAN header info,
548 * hope the underlying device can handle it.
549 */
550 new_dev->mtu = real_dev->mtu;
551
Patrick McHardy2f4284a2007-06-13 12:05:41 -0700552#ifdef VLAN_DEBUG
553 printk(VLAN_DBG "Allocated new name -:%s:-\n", new_dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 VLAN_MEM_DBG("new_dev->priv malloc, addr: %p size: %i\n",
555 new_dev->priv,
556 sizeof(struct vlan_dev_info));
Patrick McHardy2f4284a2007-06-13 12:05:41 -0700557#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558
559 VLAN_DEV_INFO(new_dev)->vlan_id = VLAN_ID; /* 1 through VLAN_VID_MASK */
560 VLAN_DEV_INFO(new_dev)->real_dev = real_dev;
561 VLAN_DEV_INFO(new_dev)->dent = NULL;
Patrick McHardya4bf3af42007-06-13 12:07:37 -0700562 VLAN_DEV_INFO(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563
Patrick McHardy07b5b172007-06-13 12:07:54 -0700564 new_dev->rtnl_link_ops = &vlan_link_ops;
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700565 err = register_vlan_dev(new_dev);
566 if (err < 0)
Patrick McHardye89fe422007-06-13 12:06:29 -0700567 goto out_free_newdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569#ifdef VLAN_DEBUG
570 printk(VLAN_DBG "Allocated new device successfully, returning.\n");
571#endif
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700572 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574out_free_newdev:
575 free_netdev(new_dev);
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700576 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577}
578
Patrick McHardy8c979c22007-07-11 19:45:24 -0700579static void vlan_sync_address(struct net_device *dev,
580 struct net_device *vlandev)
581{
582 struct vlan_dev_info *vlan = VLAN_DEV_INFO(vlandev);
583
584 /* May be called without an actual change */
585 if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
586 return;
587
588 /* vlan address was different from the old address and is equal to
589 * the new address */
590 if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
591 !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
592 dev_unicast_delete(dev, vlandev->dev_addr, ETH_ALEN);
593
594 /* vlan address was equal to the old address and is different from
595 * the new address */
596 if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
597 compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
598 dev_unicast_add(dev, vlandev->dev_addr, ETH_ALEN);
599
600 memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
601}
602
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603static int vlan_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
604{
605 struct net_device *dev = ptr;
606 struct vlan_group *grp = __vlan_find_group(dev->ifindex);
607 int i, flgs;
608 struct net_device *vlandev;
609
Eric W. Biedermane9dc8652007-09-12 13:02:17 +0200610 if (dev->nd_net != &init_net)
611 return NOTIFY_DONE;
612
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613 if (!grp)
614 goto out;
615
616 /* It is OK that we do not hold the group lock right now,
617 * as we run under the RTNL lock.
618 */
619
620 switch (event) {
621 case NETDEV_CHANGE:
622 /* Propagate real device state to vlan devices */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
Dan Aloni5c15bde2007-03-02 20:44:51 -0800624 vlandev = vlan_group_get_device(grp, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625 if (!vlandev)
626 continue;
627
Stefan Rompfddd7bf92006-03-20 17:11:41 -0800628 vlan_transfer_operstate(dev, vlandev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629 }
630 break;
631
Patrick McHardy8c979c22007-07-11 19:45:24 -0700632 case NETDEV_CHANGEADDR:
633 /* Adjust unicast filters on underlying device */
634 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
635 vlandev = vlan_group_get_device(grp, i);
636 if (!vlandev)
637 continue;
638
Patrick McHardyd932e042007-11-10 21:51:40 -0800639 flgs = vlandev->flags;
640 if (!(flgs & IFF_UP))
641 continue;
642
Patrick McHardy8c979c22007-07-11 19:45:24 -0700643 vlan_sync_address(dev, vlandev);
644 }
645 break;
646
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647 case NETDEV_DOWN:
648 /* Put all VLANs for this dev in the down state too. */
649 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
Dan Aloni5c15bde2007-03-02 20:44:51 -0800650 vlandev = vlan_group_get_device(grp, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651 if (!vlandev)
652 continue;
653
654 flgs = vlandev->flags;
655 if (!(flgs & IFF_UP))
656 continue;
657
658 dev_change_flags(vlandev, flgs & ~IFF_UP);
659 }
660 break;
661
662 case NETDEV_UP:
663 /* Put all VLANs for this dev in the up state too. */
664 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
Dan Aloni5c15bde2007-03-02 20:44:51 -0800665 vlandev = vlan_group_get_device(grp, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666 if (!vlandev)
667 continue;
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +0900668
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669 flgs = vlandev->flags;
670 if (flgs & IFF_UP)
671 continue;
672
673 dev_change_flags(vlandev, flgs | IFF_UP);
674 }
675 break;
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +0900676
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677 case NETDEV_UNREGISTER:
678 /* Delete all VLANs for this dev. */
679 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
680 int ret;
681
Dan Aloni5c15bde2007-03-02 20:44:51 -0800682 vlandev = vlan_group_get_device(grp, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683 if (!vlandev)
684 continue;
685
686 ret = unregister_vlan_dev(dev,
687 VLAN_DEV_INFO(vlandev)->vlan_id);
688
689 unregister_netdevice(vlandev);
690
691 /* Group was destroyed? */
692 if (ret == 1)
693 break;
694 }
695 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700696 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697
698out:
699 return NOTIFY_DONE;
700}
701
702/*
703 * VLAN IOCTL handler.
704 * o execute requested action or pass command to the device driver
705 * arg is really a struct vlan_ioctl_args __user *.
706 */
Eric W. Biederman881d9662007-09-17 11:56:21 -0700707static int vlan_ioctl_handler(struct net *net, void __user *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708{
Patrick McHardyc17d8872007-06-13 12:05:22 -0700709 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 unsigned short vid = 0;
711 struct vlan_ioctl_args args;
Patrick McHardyc17d8872007-06-13 12:05:22 -0700712 struct net_device *dev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713
714 if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
715 return -EFAULT;
716
717 /* Null terminate this sucker, just in case. */
718 args.device1[23] = 0;
719 args.u.device2[23] = 0;
720
721#ifdef VLAN_DEBUG
722 printk(VLAN_DBG "%s: args.cmd: %x\n", __FUNCTION__, args.cmd);
723#endif
724
Patrick McHardyc17d8872007-06-13 12:05:22 -0700725 rtnl_lock();
726
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727 switch (args.cmd) {
728 case SET_VLAN_INGRESS_PRIORITY_CMD:
Patrick McHardyc17d8872007-06-13 12:05:22 -0700729 case SET_VLAN_EGRESS_PRIORITY_CMD:
730 case SET_VLAN_FLAG_CMD:
731 case ADD_VLAN_CMD:
732 case DEL_VLAN_CMD:
733 case GET_VLAN_REALDEV_NAME_CMD:
734 case GET_VLAN_VID_CMD:
735 err = -ENODEV;
Eric W. Biederman881d9662007-09-17 11:56:21 -0700736 dev = __dev_get_by_name(&init_net, args.device1);
Patrick McHardyc17d8872007-06-13 12:05:22 -0700737 if (!dev)
738 goto out;
739
740 err = -EINVAL;
741 if (args.cmd != ADD_VLAN_CMD &&
742 !(dev->priv_flags & IFF_802_1Q_VLAN))
743 goto out;
744 }
745
746 switch (args.cmd) {
747 case SET_VLAN_INGRESS_PRIORITY_CMD:
748 err = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749 if (!capable(CAP_NET_ADMIN))
Patrick McHardyc17d8872007-06-13 12:05:22 -0700750 break;
751 vlan_dev_set_ingress_priority(dev,
752 args.u.skb_priority,
753 args.vlan_qos);
Patrick McHardyfffe4702007-11-07 01:31:32 -0800754 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755 break;
756
757 case SET_VLAN_EGRESS_PRIORITY_CMD:
Patrick McHardyc17d8872007-06-13 12:05:22 -0700758 err = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759 if (!capable(CAP_NET_ADMIN))
Patrick McHardyc17d8872007-06-13 12:05:22 -0700760 break;
761 err = vlan_dev_set_egress_priority(dev,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762 args.u.skb_priority,
763 args.vlan_qos);
764 break;
765
766 case SET_VLAN_FLAG_CMD:
Patrick McHardyc17d8872007-06-13 12:05:22 -0700767 err = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768 if (!capable(CAP_NET_ADMIN))
Patrick McHardyc17d8872007-06-13 12:05:22 -0700769 break;
770 err = vlan_dev_set_vlan_flag(dev,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771 args.u.flag,
772 args.vlan_qos);
773 break;
774
775 case SET_VLAN_NAME_TYPE_CMD:
Patrick McHardyc17d8872007-06-13 12:05:22 -0700776 err = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777 if (!capable(CAP_NET_ADMIN))
778 return -EPERM;
Patrick McHardyc17d8872007-06-13 12:05:22 -0700779 if ((args.u.name_type >= 0) &&
780 (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781 vlan_name_type = args.u.name_type;
782 err = 0;
783 } else {
784 err = -EINVAL;
785 }
786 break;
787
788 case ADD_VLAN_CMD:
Patrick McHardyc17d8872007-06-13 12:05:22 -0700789 err = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790 if (!capable(CAP_NET_ADMIN))
Patrick McHardyc17d8872007-06-13 12:05:22 -0700791 break;
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700792 err = register_vlan_device(dev, args.u.VID);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793 break;
794
795 case DEL_VLAN_CMD:
Patrick McHardyc17d8872007-06-13 12:05:22 -0700796 err = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797 if (!capable(CAP_NET_ADMIN))
Patrick McHardyc17d8872007-06-13 12:05:22 -0700798 break;
799 err = unregister_vlan_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800 break;
801
802 case GET_VLAN_INGRESS_PRIORITY_CMD:
803 /* TODO: Implement
804 err = vlan_dev_get_ingress_priority(args);
805 if (copy_to_user((void*)arg, &args,
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +0900806 sizeof(struct vlan_ioctl_args))) {
807 err = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808 }
809 */
810 err = -EINVAL;
811 break;
812 case GET_VLAN_EGRESS_PRIORITY_CMD:
813 /* TODO: Implement
814 err = vlan_dev_get_egress_priority(args.device1, &(args.args);
815 if (copy_to_user((void*)arg, &args,
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +0900816 sizeof(struct vlan_ioctl_args))) {
817 err = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818 }
819 */
820 err = -EINVAL;
821 break;
822 case GET_VLAN_REALDEV_NAME_CMD:
Andrew Morton3f5f4342007-07-24 15:37:11 -0700823 err = 0;
Patrick McHardyc17d8872007-06-13 12:05:22 -0700824 vlan_dev_get_realdev_name(dev, args.u.device2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825 if (copy_to_user(arg, &args,
826 sizeof(struct vlan_ioctl_args))) {
827 err = -EFAULT;
828 }
829 break;
830
831 case GET_VLAN_VID_CMD:
Andrew Morton3f5f4342007-07-24 15:37:11 -0700832 err = 0;
Patrick McHardyc17d8872007-06-13 12:05:22 -0700833 vlan_dev_get_vid(dev, &vid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834 args.u.VID = vid;
835 if (copy_to_user(arg, &args,
836 sizeof(struct vlan_ioctl_args))) {
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +0900837 err = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838 }
839 break;
840
841 default:
842 /* pass on to underlying device instead?? */
843 printk(VLAN_DBG "%s: Unknown VLAN CMD: %x \n",
844 __FUNCTION__, args.cmd);
Patrick McHardyc17d8872007-06-13 12:05:22 -0700845 err = -EINVAL;
846 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700847 }
Mika Kukkonen7eb1b3d2005-12-21 18:39:49 -0800848out:
Patrick McHardyc17d8872007-06-13 12:05:22 -0700849 rtnl_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850 return err;
851}
852
853MODULE_LICENSE("GPL");
854MODULE_VERSION(DRV_VERSION);