blob: 1583c5ef963f06013a455634b5b8604916c1289c [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>
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) */
44static 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
47static char vlan_fullname[] = "802.1Q VLAN Support";
48static char vlan_version[] = DRV_VERSION;
49static char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>";
50static char vlan_buggyright[] = "David S. Miller <davem@redhat.com>";
51
52static int vlan_device_event(struct notifier_block *, unsigned long, void *);
53static int vlan_ioctl_handler(void __user *);
54static int unregister_vlan_dev(struct net_device *, unsigned short );
55
56static 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. */
63unsigned short vlan_name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
64
65static struct packet_type vlan_packet_type = {
66 .type = __constant_htons(ETH_P_8021Q),
67 .func = vlan_skb_recv, /* VLAN receive method */
68};
69
Linus Torvalds1da177e2005-04-16 15:20:36 -070070/* End of global variables definitions. */
71
72/*
73 * Function vlan_proto_init (pro)
74 *
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +090075 * Initialize VLAN protocol layer,
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 *
77 */
78static 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) {
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +090090 printk(KERN_ERR
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 "%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);
Patrick McHardy07b5b172007-06-13 12:07:54 -0700100 if (err < 0)
101 goto err1;
102
103 err = vlan_netlink_init();
104 if (err < 0)
105 goto err2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106
107 vlan_ioctl_set(vlan_ioctl_handler);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 return 0;
Patrick McHardy07b5b172007-06-13 12:07:54 -0700109
110err2:
111 unregister_netdevice_notifier(&vlan_notifier_block);
112err1:
113 vlan_proc_cleanup();
114 dev_remove_pack(&vlan_packet_type);
115 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116}
117
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118/*
119 * Module 'remove' entry point.
120 * o delete /proc/net/router directory and static entries.
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +0900121 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122static void __exit vlan_cleanup_module(void)
123{
124 int i;
125
Patrick McHardy07b5b172007-06-13 12:07:54 -0700126 vlan_netlink_fini();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 vlan_ioctl_set(NULL);
128
129 /* Un-register us from receiving netdevice events */
130 unregister_netdevice_notifier(&vlan_notifier_block);
131
132 dev_remove_pack(&vlan_packet_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133
134 /* This table must be empty if there are no module
135 * references left.
136 */
137 for (i = 0; i < VLAN_GRP_HASH_SIZE; i++) {
138 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
139 }
140 vlan_proc_cleanup();
141
142 synchronize_net();
143}
144
145module_init(vlan_proto_init);
146module_exit(vlan_cleanup_module);
147
148/* Must be invoked with RCU read lock (no preempt) */
149static struct vlan_group *__vlan_find_group(int real_dev_ifindex)
150{
151 struct vlan_group *grp;
152 struct hlist_node *n;
153 int hash = vlan_grp_hashfn(real_dev_ifindex);
154
155 hlist_for_each_entry_rcu(grp, n, &vlan_group_hash[hash], hlist) {
156 if (grp->real_dev_ifindex == real_dev_ifindex)
157 return grp;
158 }
159
160 return NULL;
161}
162
163/* Find the protocol handler. Assumes VID < VLAN_VID_MASK.
164 *
165 * Must be invoked with RCU read lock (no preempt)
166 */
167struct net_device *__find_vlan_dev(struct net_device *real_dev,
168 unsigned short VID)
169{
170 struct vlan_group *grp = __vlan_find_group(real_dev->ifindex);
171
172 if (grp)
Dan Aloni5c15bde2007-03-02 20:44:51 -0800173 return vlan_group_get_device(grp, VID);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174
175 return NULL;
176}
177
Dan Aloni5c15bde2007-03-02 20:44:51 -0800178static void vlan_group_free(struct vlan_group *grp)
179{
180 int i;
181
182 for (i=0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
183 kfree(grp->vlan_devices_arrays[i]);
184 kfree(grp);
185}
186
Patrick McHardy42429aa2007-06-13 12:05:59 -0700187static struct vlan_group *vlan_group_alloc(int ifindex)
188{
189 struct vlan_group *grp;
190 unsigned int size;
191 unsigned int i;
192
193 grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
194 if (!grp)
195 return NULL;
196
197 size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
198
199 for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++) {
200 grp->vlan_devices_arrays[i] = kzalloc(size, GFP_KERNEL);
201 if (!grp->vlan_devices_arrays[i])
202 goto err;
203 }
204
205 grp->real_dev_ifindex = ifindex;
206 hlist_add_head_rcu(&grp->hlist,
207 &vlan_group_hash[vlan_grp_hashfn(ifindex)]);
208 return grp;
209
210err:
211 vlan_group_free(grp);
212 return NULL;
213}
214
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215static void vlan_rcu_free(struct rcu_head *rcu)
216{
Dan Aloni5c15bde2007-03-02 20:44:51 -0800217 vlan_group_free(container_of(rcu, struct vlan_group, rcu));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218}
219
220
221/* This returns 0 if everything went fine.
222 * It will return 1 if the group was killed as a result.
223 * A negative return indicates failure.
224 *
225 * The RTNL lock must be held.
226 */
227static int unregister_vlan_dev(struct net_device *real_dev,
228 unsigned short vlan_id)
229{
230 struct net_device *dev = NULL;
231 int real_dev_ifindex = real_dev->ifindex;
232 struct vlan_group *grp;
233 int i, ret;
234
235#ifdef VLAN_DEBUG
236 printk(VLAN_DBG "%s: VID: %i\n", __FUNCTION__, vlan_id);
237#endif
238
239 /* sanity check */
240 if (vlan_id >= VLAN_VID_MASK)
241 return -EINVAL;
242
243 ASSERT_RTNL();
244 grp = __vlan_find_group(real_dev_ifindex);
245
246 ret = 0;
247
248 if (grp) {
Dan Aloni5c15bde2007-03-02 20:44:51 -0800249 dev = vlan_group_get_device(grp, vlan_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 if (dev) {
251 /* Remove proc entry */
252 vlan_proc_rem_dev(dev);
253
254 /* Take it out of our own structures, but be sure to
255 * interlock with HW accelerating devices or SW vlan
256 * input packet processing.
257 */
Stephen Hemmingerd2d1acd2007-06-01 09:43:57 -0700258 if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 real_dev->vlan_rx_kill_vid(real_dev, vlan_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260
Dan Aloni5c15bde2007-03-02 20:44:51 -0800261 vlan_group_set_device(grp, vlan_id, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 synchronize_net();
263
264
265 /* Caller unregisters (and if necessary, puts)
266 * VLAN device, but we get rid of the reference to
267 * real_dev here.
268 */
269 dev_put(real_dev);
270
271 /* If the group is now empty, kill off the
272 * group.
273 */
274 for (i = 0; i < VLAN_VID_MASK; i++)
Dan Aloni5c15bde2007-03-02 20:44:51 -0800275 if (vlan_group_get_device(grp, i))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 break;
277
278 if (i == VLAN_VID_MASK) {
279 if (real_dev->features & NETIF_F_HW_VLAN_RX)
280 real_dev->vlan_rx_register(real_dev, NULL);
281
282 hlist_del_rcu(&grp->hlist);
283
284 /* Free the group, after all cpu's are done. */
285 call_rcu(&grp->rcu, vlan_rcu_free);
286
287 grp = NULL;
288 ret = 1;
289 }
290 }
291 }
292
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +0900293 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294}
295
Patrick McHardy07b5b172007-06-13 12:07:54 -0700296int unregister_vlan_device(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 int ret;
299
Patrick McHardyc17d8872007-06-13 12:05:22 -0700300 ret = unregister_vlan_dev(VLAN_DEV_INFO(dev)->real_dev,
301 VLAN_DEV_INFO(dev)->vlan_id);
302 unregister_netdevice(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303
Patrick McHardyc17d8872007-06-13 12:05:22 -0700304 if (ret == 1)
305 ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 return ret;
307}
308
Patrick McHardy2f4284a2007-06-13 12:05:41 -0700309/*
310 * vlan network devices have devices nesting below it, and are a special
311 * "super class" of normal network devices; split their locks off into a
312 * separate class since they always nest.
313 */
314static struct lock_class_key vlan_netdev_xmit_lock_key;
315
316static int vlan_dev_init(struct net_device *dev)
317{
318 struct net_device *real_dev = VLAN_DEV_INFO(dev)->real_dev;
319
320 /* IFF_BROADCAST|IFF_MULTICAST; ??? */
321 dev->flags = real_dev->flags & ~IFF_UP;
322 dev->iflink = real_dev->ifindex;
323 dev->state = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
324 (1<<__LINK_STATE_DORMANT))) |
325 (1<<__LINK_STATE_PRESENT);
326
Patrick McHardy0e068772007-07-11 19:42:31 -0700327 if (is_zero_ether_addr(dev->dev_addr))
328 memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len);
329 if (is_zero_ether_addr(dev->broadcast))
330 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
Patrick McHardy2f4284a2007-06-13 12:05:41 -0700331
332 if (real_dev->features & NETIF_F_HW_VLAN_TX) {
333 dev->hard_header = real_dev->hard_header;
334 dev->hard_header_len = real_dev->hard_header_len;
335 dev->hard_start_xmit = vlan_dev_hwaccel_hard_start_xmit;
336 dev->rebuild_header = real_dev->rebuild_header;
337 } else {
338 dev->hard_header = vlan_dev_hard_header;
339 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
340 dev->hard_start_xmit = vlan_dev_hard_start_xmit;
341 dev->rebuild_header = vlan_dev_rebuild_header;
342 }
343 dev->hard_header_parse = real_dev->hard_header_parse;
Patrick McHardy8c979c22007-07-11 19:45:24 -0700344 dev->hard_header_cache = NULL;
Patrick McHardy2f4284a2007-06-13 12:05:41 -0700345
346 lockdep_set_class(&dev->_xmit_lock, &vlan_netdev_xmit_lock_key);
347 return 0;
348}
349
Patrick McHardy07b5b172007-06-13 12:07:54 -0700350void vlan_setup(struct net_device *new_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351{
352 SET_MODULE_OWNER(new_dev);
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +0900353
Patrick McHardy8c979c22007-07-11 19:45:24 -0700354 ether_setup(new_dev);
355
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 /* new_dev->ifindex = 0; it will be set when added to
357 * the global list.
358 * iflink is set as well.
359 */
360 new_dev->get_stats = vlan_dev_get_stats;
361
362 /* Make this thing known as a VLAN device */
363 new_dev->priv_flags |= IFF_802_1Q_VLAN;
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +0900364
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 /* Set us up to have no queue, as the underlying Hardware device
366 * can do all the queueing we could want.
367 */
368 new_dev->tx_queue_len = 0;
369
370 /* set up method calls */
371 new_dev->change_mtu = vlan_dev_change_mtu;
Patrick McHardy2f4284a2007-06-13 12:05:41 -0700372 new_dev->init = vlan_dev_init;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 new_dev->open = vlan_dev_open;
374 new_dev->stop = vlan_dev_stop;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 new_dev->set_multicast_list = vlan_dev_set_multicast_list;
Patrick McHardy6c78dcb2007-07-14 18:52:56 -0700376 new_dev->change_rx_flags = vlan_change_rx_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 new_dev->destructor = free_netdev;
378 new_dev->do_ioctl = vlan_dev_ioctl;
Patrick McHardy0e068772007-07-11 19:42:31 -0700379
Patrick McHardya7ecfc82007-07-14 18:56:30 -0700380 memset(new_dev->broadcast, 0, ETH_ALEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381}
382
Stefan Rompfddd7bf92006-03-20 17:11:41 -0800383static void vlan_transfer_operstate(const struct net_device *dev, struct net_device *vlandev)
384{
385 /* Have to respect userspace enforced dormant state
386 * of real device, also must allow supplicant running
387 * on VLAN device
388 */
389 if (dev->operstate == IF_OPER_DORMANT)
390 netif_dormant_on(vlandev);
391 else
392 netif_dormant_off(vlandev);
393
394 if (netif_carrier_ok(dev)) {
395 if (!netif_carrier_ok(vlandev))
396 netif_carrier_on(vlandev);
397 } else {
398 if (netif_carrier_ok(vlandev))
399 netif_carrier_off(vlandev);
400 }
401}
402
Patrick McHardy07b5b172007-06-13 12:07:54 -0700403int vlan_check_real_dev(struct net_device *real_dev, unsigned short vlan_id)
Patrick McHardyc1d3ee992007-06-13 12:06:14 -0700404{
405 if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
406 printk(VLAN_DBG "%s: VLANs not supported on %s.\n",
407 __FUNCTION__, real_dev->name);
408 return -EOPNOTSUPP;
409 }
410
411 if ((real_dev->features & NETIF_F_HW_VLAN_RX) &&
412 !real_dev->vlan_rx_register) {
413 printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
414 __FUNCTION__, real_dev->name);
415 return -EOPNOTSUPP;
416 }
417
418 if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
419 (!real_dev->vlan_rx_add_vid || !real_dev->vlan_rx_kill_vid)) {
420 printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
421 __FUNCTION__, real_dev->name);
422 return -EOPNOTSUPP;
423 }
424
425 /* The real device must be up and operating in order to
426 * assosciate a VLAN device with it.
427 */
428 if (!(real_dev->flags & IFF_UP))
429 return -ENETDOWN;
430
431 if (__find_vlan_dev(real_dev, vlan_id) != NULL) {
432 /* was already registered. */
433 printk(VLAN_DBG "%s: ALREADY had VLAN registered\n", __FUNCTION__);
434 return -EEXIST;
435 }
436
437 return 0;
438}
439
Patrick McHardy07b5b172007-06-13 12:07:54 -0700440int register_vlan_dev(struct net_device *dev)
Patrick McHardye89fe422007-06-13 12:06:29 -0700441{
442 struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev);
443 struct net_device *real_dev = vlan->real_dev;
444 unsigned short vlan_id = vlan->vlan_id;
445 struct vlan_group *grp, *ngrp = NULL;
446 int err;
447
448 grp = __vlan_find_group(real_dev->ifindex);
449 if (!grp) {
450 ngrp = grp = vlan_group_alloc(real_dev->ifindex);
451 if (!grp)
452 return -ENOBUFS;
453 }
454
455 err = register_netdevice(dev);
456 if (err < 0)
457 goto out_free_group;
458
459 /* Account for reference in struct vlan_dev_info */
460 dev_hold(real_dev);
461
462 vlan_transfer_operstate(real_dev, dev);
463 linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
464
465 /* So, got the sucker initialized, now lets place
466 * it into our local structure.
467 */
468 vlan_group_set_device(grp, vlan_id, dev);
469 if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX)
470 real_dev->vlan_rx_register(real_dev, ngrp);
471 if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
472 real_dev->vlan_rx_add_vid(real_dev, vlan_id);
473
474 if (vlan_proc_add_dev(dev) < 0)
475 printk(KERN_WARNING "VLAN: failed to add proc entry for %s\n",
476 dev->name);
477 return 0;
478
479out_free_group:
480 if (ngrp)
481 vlan_group_free(ngrp);
482 return err;
483}
484
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485/* Attach a VLAN device to a mac address (ie Ethernet Card).
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700486 * Returns 0 if the device was created or a negative error code otherwise.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 */
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700488static int register_vlan_device(struct net_device *real_dev,
489 unsigned short VLAN_ID)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491 struct net_device *new_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492 char name[IFNAMSIZ];
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700493 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494
495#ifdef VLAN_DEBUG
496 printk(VLAN_DBG "%s: if_name -:%s:- vid: %i\n",
497 __FUNCTION__, eth_IF_name, VLAN_ID);
498#endif
499
500 if (VLAN_ID >= VLAN_VID_MASK)
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700501 return -ERANGE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700503 err = vlan_check_real_dev(real_dev, VLAN_ID);
504 if (err < 0)
505 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506
507 /* Gotta set up the fields for the device. */
508#ifdef VLAN_DEBUG
509 printk(VLAN_DBG "About to allocate name, vlan_name_type: %i\n",
510 vlan_name_type);
511#endif
512 switch (vlan_name_type) {
513 case VLAN_NAME_TYPE_RAW_PLUS_VID:
514 /* name will look like: eth1.0005 */
515 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, VLAN_ID);
516 break;
517 case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
518 /* Put our vlan.VID in the name.
519 * Name will look like: vlan5
520 */
521 snprintf(name, IFNAMSIZ, "vlan%i", VLAN_ID);
522 break;
523 case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
524 /* Put our vlan.VID in the name.
525 * Name will look like: eth0.5
526 */
527 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, VLAN_ID);
528 break;
529 case VLAN_NAME_TYPE_PLUS_VID:
530 /* Put our vlan.VID in the name.
531 * Name will look like: vlan0005
532 */
533 default:
534 snprintf(name, IFNAMSIZ, "vlan%.4i", VLAN_ID);
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700535 }
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +0900536
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
538 vlan_setup);
Arjan van de Ven5dd8d1e2006-07-03 00:25:33 -0700539
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 if (new_dev == NULL)
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700541 return -ENOBUFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 /* need 4 bytes for extra VLAN header info,
544 * hope the underlying device can handle it.
545 */
546 new_dev->mtu = real_dev->mtu;
547
Patrick McHardy2f4284a2007-06-13 12:05:41 -0700548#ifdef VLAN_DEBUG
549 printk(VLAN_DBG "Allocated new name -:%s:-\n", new_dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 VLAN_MEM_DBG("new_dev->priv malloc, addr: %p size: %i\n",
551 new_dev->priv,
552 sizeof(struct vlan_dev_info));
Patrick McHardy2f4284a2007-06-13 12:05:41 -0700553#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554
555 VLAN_DEV_INFO(new_dev)->vlan_id = VLAN_ID; /* 1 through VLAN_VID_MASK */
556 VLAN_DEV_INFO(new_dev)->real_dev = real_dev;
557 VLAN_DEV_INFO(new_dev)->dent = NULL;
Patrick McHardya4bf3af42007-06-13 12:07:37 -0700558 VLAN_DEV_INFO(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559
Patrick McHardy07b5b172007-06-13 12:07:54 -0700560 new_dev->rtnl_link_ops = &vlan_link_ops;
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700561 err = register_vlan_dev(new_dev);
562 if (err < 0)
Patrick McHardye89fe422007-06-13 12:06:29 -0700563 goto out_free_newdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564
Patrick McHardyc17d8872007-06-13 12:05:22 -0700565 /* Account for reference in struct vlan_dev_info */
566 dev_hold(real_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567#ifdef VLAN_DEBUG
568 printk(VLAN_DBG "Allocated new device successfully, returning.\n");
569#endif
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700570 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572out_free_newdev:
573 free_netdev(new_dev);
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700574 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575}
576
Patrick McHardy8c979c22007-07-11 19:45:24 -0700577static void vlan_sync_address(struct net_device *dev,
578 struct net_device *vlandev)
579{
580 struct vlan_dev_info *vlan = VLAN_DEV_INFO(vlandev);
581
582 /* May be called without an actual change */
583 if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
584 return;
585
586 /* vlan address was different from the old address and is equal to
587 * the new address */
588 if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
589 !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
590 dev_unicast_delete(dev, vlandev->dev_addr, ETH_ALEN);
591
592 /* vlan address was equal to the old address and is different from
593 * the new address */
594 if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
595 compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
596 dev_unicast_add(dev, vlandev->dev_addr, ETH_ALEN);
597
598 memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
599}
600
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601static int vlan_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
602{
603 struct net_device *dev = ptr;
604 struct vlan_group *grp = __vlan_find_group(dev->ifindex);
605 int i, flgs;
606 struct net_device *vlandev;
607
608 if (!grp)
609 goto out;
610
611 /* It is OK that we do not hold the group lock right now,
612 * as we run under the RTNL lock.
613 */
614
615 switch (event) {
616 case NETDEV_CHANGE:
617 /* Propagate real device state to vlan devices */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
Dan Aloni5c15bde2007-03-02 20:44:51 -0800619 vlandev = vlan_group_get_device(grp, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620 if (!vlandev)
621 continue;
622
Stefan Rompfddd7bf92006-03-20 17:11:41 -0800623 vlan_transfer_operstate(dev, vlandev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 }
625 break;
626
Patrick McHardy8c979c22007-07-11 19:45:24 -0700627 case NETDEV_CHANGEADDR:
628 /* Adjust unicast filters on underlying device */
629 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
630 vlandev = vlan_group_get_device(grp, i);
631 if (!vlandev)
632 continue;
633
634 vlan_sync_address(dev, vlandev);
635 }
636 break;
637
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638 case NETDEV_DOWN:
639 /* Put all VLANs for this dev in the down state too. */
640 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
Dan Aloni5c15bde2007-03-02 20:44:51 -0800641 vlandev = vlan_group_get_device(grp, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642 if (!vlandev)
643 continue;
644
645 flgs = vlandev->flags;
646 if (!(flgs & IFF_UP))
647 continue;
648
649 dev_change_flags(vlandev, flgs & ~IFF_UP);
650 }
651 break;
652
653 case NETDEV_UP:
654 /* Put all VLANs for this dev in the up state too. */
655 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
Dan Aloni5c15bde2007-03-02 20:44:51 -0800656 vlandev = vlan_group_get_device(grp, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657 if (!vlandev)
658 continue;
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +0900659
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660 flgs = vlandev->flags;
661 if (flgs & IFF_UP)
662 continue;
663
664 dev_change_flags(vlandev, flgs | IFF_UP);
665 }
666 break;
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +0900667
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668 case NETDEV_UNREGISTER:
669 /* Delete all VLANs for this dev. */
670 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
671 int ret;
672
Dan Aloni5c15bde2007-03-02 20:44:51 -0800673 vlandev = vlan_group_get_device(grp, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674 if (!vlandev)
675 continue;
676
677 ret = unregister_vlan_dev(dev,
678 VLAN_DEV_INFO(vlandev)->vlan_id);
679
680 unregister_netdevice(vlandev);
681
682 /* Group was destroyed? */
683 if (ret == 1)
684 break;
685 }
686 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700687 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688
689out:
690 return NOTIFY_DONE;
691}
692
693/*
694 * VLAN IOCTL handler.
695 * o execute requested action or pass command to the device driver
696 * arg is really a struct vlan_ioctl_args __user *.
697 */
698static int vlan_ioctl_handler(void __user *arg)
699{
Patrick McHardyc17d8872007-06-13 12:05:22 -0700700 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701 unsigned short vid = 0;
702 struct vlan_ioctl_args args;
Patrick McHardyc17d8872007-06-13 12:05:22 -0700703 struct net_device *dev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704
705 if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
706 return -EFAULT;
707
708 /* Null terminate this sucker, just in case. */
709 args.device1[23] = 0;
710 args.u.device2[23] = 0;
711
712#ifdef VLAN_DEBUG
713 printk(VLAN_DBG "%s: args.cmd: %x\n", __FUNCTION__, args.cmd);
714#endif
715
Patrick McHardyc17d8872007-06-13 12:05:22 -0700716 rtnl_lock();
717
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718 switch (args.cmd) {
719 case SET_VLAN_INGRESS_PRIORITY_CMD:
Patrick McHardyc17d8872007-06-13 12:05:22 -0700720 case SET_VLAN_EGRESS_PRIORITY_CMD:
721 case SET_VLAN_FLAG_CMD:
722 case ADD_VLAN_CMD:
723 case DEL_VLAN_CMD:
724 case GET_VLAN_REALDEV_NAME_CMD:
725 case GET_VLAN_VID_CMD:
726 err = -ENODEV;
727 dev = __dev_get_by_name(args.device1);
728 if (!dev)
729 goto out;
730
731 err = -EINVAL;
732 if (args.cmd != ADD_VLAN_CMD &&
733 !(dev->priv_flags & IFF_802_1Q_VLAN))
734 goto out;
735 }
736
737 switch (args.cmd) {
738 case SET_VLAN_INGRESS_PRIORITY_CMD:
739 err = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740 if (!capable(CAP_NET_ADMIN))
Patrick McHardyc17d8872007-06-13 12:05:22 -0700741 break;
742 vlan_dev_set_ingress_priority(dev,
743 args.u.skb_priority,
744 args.vlan_qos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745 break;
746
747 case SET_VLAN_EGRESS_PRIORITY_CMD:
Patrick McHardyc17d8872007-06-13 12:05:22 -0700748 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 err = vlan_dev_set_egress_priority(dev,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752 args.u.skb_priority,
753 args.vlan_qos);
754 break;
755
756 case SET_VLAN_FLAG_CMD:
Patrick McHardyc17d8872007-06-13 12:05:22 -0700757 err = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758 if (!capable(CAP_NET_ADMIN))
Patrick McHardyc17d8872007-06-13 12:05:22 -0700759 break;
760 err = vlan_dev_set_vlan_flag(dev,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761 args.u.flag,
762 args.vlan_qos);
763 break;
764
765 case SET_VLAN_NAME_TYPE_CMD:
Patrick McHardyc17d8872007-06-13 12:05:22 -0700766 err = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767 if (!capable(CAP_NET_ADMIN))
768 return -EPERM;
Patrick McHardyc17d8872007-06-13 12:05:22 -0700769 if ((args.u.name_type >= 0) &&
770 (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771 vlan_name_type = args.u.name_type;
772 err = 0;
773 } else {
774 err = -EINVAL;
775 }
776 break;
777
778 case ADD_VLAN_CMD:
Patrick McHardyc17d8872007-06-13 12:05:22 -0700779 err = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780 if (!capable(CAP_NET_ADMIN))
Patrick McHardyc17d8872007-06-13 12:05:22 -0700781 break;
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700782 err = register_vlan_device(dev, args.u.VID);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783 break;
784
785 case DEL_VLAN_CMD:
Patrick McHardyc17d8872007-06-13 12:05:22 -0700786 err = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787 if (!capable(CAP_NET_ADMIN))
Patrick McHardyc17d8872007-06-13 12:05:22 -0700788 break;
789 err = unregister_vlan_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790 break;
791
792 case GET_VLAN_INGRESS_PRIORITY_CMD:
793 /* TODO: Implement
794 err = vlan_dev_get_ingress_priority(args);
795 if (copy_to_user((void*)arg, &args,
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +0900796 sizeof(struct vlan_ioctl_args))) {
797 err = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 }
799 */
800 err = -EINVAL;
801 break;
802 case GET_VLAN_EGRESS_PRIORITY_CMD:
803 /* TODO: Implement
804 err = vlan_dev_get_egress_priority(args.device1, &(args.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_REALDEV_NAME_CMD:
Andrew Morton3f5f4342007-07-24 15:37:11 -0700813 err = 0;
Patrick McHardyc17d8872007-06-13 12:05:22 -0700814 vlan_dev_get_realdev_name(dev, args.u.device2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815 if (copy_to_user(arg, &args,
816 sizeof(struct vlan_ioctl_args))) {
817 err = -EFAULT;
818 }
819 break;
820
821 case GET_VLAN_VID_CMD:
Andrew Morton3f5f4342007-07-24 15:37:11 -0700822 err = 0;
Patrick McHardyc17d8872007-06-13 12:05:22 -0700823 vlan_dev_get_vid(dev, &vid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824 args.u.VID = vid;
825 if (copy_to_user(arg, &args,
826 sizeof(struct vlan_ioctl_args))) {
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +0900827 err = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828 }
829 break;
830
831 default:
832 /* pass on to underlying device instead?? */
833 printk(VLAN_DBG "%s: Unknown VLAN CMD: %x \n",
834 __FUNCTION__, args.cmd);
Patrick McHardyc17d8872007-06-13 12:05:22 -0700835 err = -EINVAL;
836 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700837 }
Mika Kukkonen7eb1b3d2005-12-21 18:39:49 -0800838out:
Patrick McHardyc17d8872007-06-13 12:05:22 -0700839 rtnl_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840 return err;
841}
842
843MODULE_LICENSE("GPL");
844MODULE_VERSION(DRV_VERSION);