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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
Linus Torvalds1da177e2005-04-16 15:20:36 -070053/* Determines interface naming scheme. */
54unsigned short vlan_name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
55
56static struct packet_type vlan_packet_type = {
57 .type = __constant_htons(ETH_P_8021Q),
58 .func = vlan_skb_recv, /* VLAN receive method */
59};
60
Linus Torvalds1da177e2005-04-16 15:20:36 -070061/* End of global variables definitions. */
62
Linus Torvalds1da177e2005-04-16 15:20:36 -070063/* Must be invoked with RCU read lock (no preempt) */
64static struct vlan_group *__vlan_find_group(int real_dev_ifindex)
65{
66 struct vlan_group *grp;
67 struct hlist_node *n;
68 int hash = vlan_grp_hashfn(real_dev_ifindex);
69
70 hlist_for_each_entry_rcu(grp, n, &vlan_group_hash[hash], hlist) {
71 if (grp->real_dev_ifindex == real_dev_ifindex)
72 return grp;
73 }
74
75 return NULL;
76}
77
78/* Find the protocol handler. Assumes VID < VLAN_VID_MASK.
79 *
80 * Must be invoked with RCU read lock (no preempt)
81 */
82struct net_device *__find_vlan_dev(struct net_device *real_dev,
83 unsigned short VID)
84{
85 struct vlan_group *grp = __vlan_find_group(real_dev->ifindex);
86
87 if (grp)
Dan Aloni5c15bde2007-03-02 20:44:51 -080088 return vlan_group_get_device(grp, VID);
Linus Torvalds1da177e2005-04-16 15:20:36 -070089
90 return NULL;
91}
92
Dan Aloni5c15bde2007-03-02 20:44:51 -080093static void vlan_group_free(struct vlan_group *grp)
94{
95 int i;
96
97 for (i=0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
98 kfree(grp->vlan_devices_arrays[i]);
99 kfree(grp);
100}
101
Patrick McHardy42429aa2007-06-13 12:05:59 -0700102static struct vlan_group *vlan_group_alloc(int ifindex)
103{
104 struct vlan_group *grp;
105 unsigned int size;
106 unsigned int i;
107
108 grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
109 if (!grp)
110 return NULL;
111
112 size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
113
114 for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++) {
115 grp->vlan_devices_arrays[i] = kzalloc(size, GFP_KERNEL);
116 if (!grp->vlan_devices_arrays[i])
117 goto err;
118 }
119
120 grp->real_dev_ifindex = ifindex;
121 hlist_add_head_rcu(&grp->hlist,
122 &vlan_group_hash[vlan_grp_hashfn(ifindex)]);
123 return grp;
124
125err:
126 vlan_group_free(grp);
127 return NULL;
128}
129
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130static void vlan_rcu_free(struct rcu_head *rcu)
131{
Dan Aloni5c15bde2007-03-02 20:44:51 -0800132 vlan_group_free(container_of(rcu, struct vlan_group, rcu));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133}
134
135
136/* This returns 0 if everything went fine.
137 * It will return 1 if the group was killed as a result.
138 * A negative return indicates failure.
139 *
140 * The RTNL lock must be held.
141 */
142static int unregister_vlan_dev(struct net_device *real_dev,
143 unsigned short vlan_id)
144{
Patrick McHardyacc5efb2008-01-21 00:25:31 -0800145 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 int real_dev_ifindex = real_dev->ifindex;
147 struct vlan_group *grp;
Patrick McHardyacc5efb2008-01-21 00:25:31 -0800148 unsigned int i;
149 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 if (vlan_id >= VLAN_VID_MASK)
152 return -EINVAL;
153
154 ASSERT_RTNL();
155 grp = __vlan_find_group(real_dev_ifindex);
Patrick McHardyacc5efb2008-01-21 00:25:31 -0800156 if (!grp)
157 return -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158
Patrick McHardyacc5efb2008-01-21 00:25:31 -0800159 dev = vlan_group_get_device(grp, vlan_id);
160 if (!dev)
161 return -ENOENT;
162
163 vlan_proc_rem_dev(dev);
164
165 /* Take it out of our own structures, but be sure to interlock with
166 * HW accelerating devices or SW vlan input packet processing.
167 */
168 if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
169 real_dev->vlan_rx_kill_vid(real_dev, vlan_id);
170
171 vlan_group_set_device(grp, vlan_id, NULL);
172 synchronize_net();
173
174 /* Caller unregisters (and if necessary, puts) VLAN device, but we
175 * get rid of the reference to real_dev here.
176 */
177 dev_put(real_dev);
178
179 /* If the group is now empty, kill off the group. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 ret = 0;
Patrick McHardyacc5efb2008-01-21 00:25:31 -0800181 for (i = 0; i < VLAN_VID_MASK; i++)
182 if (vlan_group_get_device(grp, i))
183 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184
Patrick McHardyacc5efb2008-01-21 00:25:31 -0800185 if (i == VLAN_VID_MASK) {
186 if (real_dev->features & NETIF_F_HW_VLAN_RX)
187 real_dev->vlan_rx_register(real_dev, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188
Patrick McHardyacc5efb2008-01-21 00:25:31 -0800189 hlist_del_rcu(&grp->hlist);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190
Patrick McHardyacc5efb2008-01-21 00:25:31 -0800191 /* Free the group, after all cpu's are done. */
192 call_rcu(&grp->rcu, vlan_rcu_free);
193 ret = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 }
195
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +0900196 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197}
198
Patrick McHardy07b5b172007-06-13 12:07:54 -0700199int unregister_vlan_device(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 int ret;
202
Patrick McHardyc17d8872007-06-13 12:05:22 -0700203 ret = unregister_vlan_dev(VLAN_DEV_INFO(dev)->real_dev,
204 VLAN_DEV_INFO(dev)->vlan_id);
205 unregister_netdevice(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206
Patrick McHardyc17d8872007-06-13 12:05:22 -0700207 if (ret == 1)
208 ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 return ret;
210}
211
Stefan Rompfddd7bf92006-03-20 17:11:41 -0800212static void vlan_transfer_operstate(const struct net_device *dev, struct net_device *vlandev)
213{
214 /* Have to respect userspace enforced dormant state
215 * of real device, also must allow supplicant running
216 * on VLAN device
217 */
218 if (dev->operstate == IF_OPER_DORMANT)
219 netif_dormant_on(vlandev);
220 else
221 netif_dormant_off(vlandev);
222
223 if (netif_carrier_ok(dev)) {
224 if (!netif_carrier_ok(vlandev))
225 netif_carrier_on(vlandev);
226 } else {
227 if (netif_carrier_ok(vlandev))
228 netif_carrier_off(vlandev);
229 }
230}
231
Patrick McHardy07b5b172007-06-13 12:07:54 -0700232int vlan_check_real_dev(struct net_device *real_dev, unsigned short vlan_id)
Patrick McHardyc1d3ee92007-06-13 12:06:14 -0700233{
Patrick McHardy40f98e12008-01-21 00:24:30 -0800234 char *name = real_dev->name;
235
Patrick McHardyc1d3ee92007-06-13 12:06:14 -0700236 if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
Patrick McHardy40f98e12008-01-21 00:24:30 -0800237 pr_info("8021q: VLANs not supported on %s\n", name);
Patrick McHardyc1d3ee92007-06-13 12:06:14 -0700238 return -EOPNOTSUPP;
239 }
240
241 if ((real_dev->features & NETIF_F_HW_VLAN_RX) &&
242 !real_dev->vlan_rx_register) {
Patrick McHardy40f98e12008-01-21 00:24:30 -0800243 pr_info("8021q: device %s has buggy VLAN hw accel\n", name);
Patrick McHardyc1d3ee92007-06-13 12:06:14 -0700244 return -EOPNOTSUPP;
245 }
246
247 if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
248 (!real_dev->vlan_rx_add_vid || !real_dev->vlan_rx_kill_vid)) {
Patrick McHardy40f98e12008-01-21 00:24:30 -0800249 pr_info("8021q: Device %s has buggy VLAN hw accel\n", name);
Patrick McHardyc1d3ee92007-06-13 12:06:14 -0700250 return -EOPNOTSUPP;
251 }
252
253 /* The real device must be up and operating in order to
254 * assosciate a VLAN device with it.
255 */
256 if (!(real_dev->flags & IFF_UP))
257 return -ENETDOWN;
258
Patrick McHardy40f98e12008-01-21 00:24:30 -0800259 if (__find_vlan_dev(real_dev, vlan_id) != NULL)
Patrick McHardyc1d3ee92007-06-13 12:06:14 -0700260 return -EEXIST;
Patrick McHardyc1d3ee92007-06-13 12:06:14 -0700261
262 return 0;
263}
264
Patrick McHardy07b5b172007-06-13 12:07:54 -0700265int register_vlan_dev(struct net_device *dev)
Patrick McHardye89fe422007-06-13 12:06:29 -0700266{
267 struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev);
268 struct net_device *real_dev = vlan->real_dev;
269 unsigned short vlan_id = vlan->vlan_id;
270 struct vlan_group *grp, *ngrp = NULL;
271 int err;
272
273 grp = __vlan_find_group(real_dev->ifindex);
274 if (!grp) {
275 ngrp = grp = vlan_group_alloc(real_dev->ifindex);
276 if (!grp)
277 return -ENOBUFS;
278 }
279
280 err = register_netdevice(dev);
281 if (err < 0)
282 goto out_free_group;
283
284 /* Account for reference in struct vlan_dev_info */
285 dev_hold(real_dev);
286
287 vlan_transfer_operstate(real_dev, dev);
288 linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
289
290 /* So, got the sucker initialized, now lets place
291 * it into our local structure.
292 */
293 vlan_group_set_device(grp, vlan_id, dev);
294 if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX)
295 real_dev->vlan_rx_register(real_dev, ngrp);
296 if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
297 real_dev->vlan_rx_add_vid(real_dev, vlan_id);
298
299 if (vlan_proc_add_dev(dev) < 0)
Patrick McHardy40f98e12008-01-21 00:24:30 -0800300 pr_warning("8021q: failed to add proc entry for %s\n",
301 dev->name);
Patrick McHardye89fe422007-06-13 12:06:29 -0700302 return 0;
303
304out_free_group:
305 if (ngrp)
306 vlan_group_free(ngrp);
307 return err;
308}
309
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310/* Attach a VLAN device to a mac address (ie Ethernet Card).
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700311 * Returns 0 if the device was created or a negative error code otherwise.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 */
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700313static int register_vlan_device(struct net_device *real_dev,
314 unsigned short VLAN_ID)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 struct net_device *new_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 char name[IFNAMSIZ];
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700318 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 if (VLAN_ID >= VLAN_VID_MASK)
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700321 return -ERANGE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700323 err = vlan_check_real_dev(real_dev, VLAN_ID);
324 if (err < 0)
325 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326
327 /* Gotta set up the fields for the device. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 switch (vlan_name_type) {
329 case VLAN_NAME_TYPE_RAW_PLUS_VID:
330 /* name will look like: eth1.0005 */
331 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, VLAN_ID);
332 break;
333 case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
334 /* Put our vlan.VID in the name.
335 * Name will look like: vlan5
336 */
337 snprintf(name, IFNAMSIZ, "vlan%i", VLAN_ID);
338 break;
339 case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
340 /* Put our vlan.VID in the name.
341 * Name will look like: eth0.5
342 */
343 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, VLAN_ID);
344 break;
345 case VLAN_NAME_TYPE_PLUS_VID:
346 /* Put our vlan.VID in the name.
347 * Name will look like: vlan0005
348 */
349 default:
350 snprintf(name, IFNAMSIZ, "vlan%.4i", VLAN_ID);
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700351 }
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +0900352
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
354 vlan_setup);
Arjan van de Ven5dd8d1e2006-07-03 00:25:33 -0700355
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 if (new_dev == NULL)
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700357 return -ENOBUFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 /* need 4 bytes for extra VLAN header info,
360 * hope the underlying device can handle it.
361 */
362 new_dev->mtu = real_dev->mtu;
363
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 VLAN_DEV_INFO(new_dev)->vlan_id = VLAN_ID; /* 1 through VLAN_VID_MASK */
365 VLAN_DEV_INFO(new_dev)->real_dev = real_dev;
366 VLAN_DEV_INFO(new_dev)->dent = NULL;
Patrick McHardya4bf3af42007-06-13 12:07:37 -0700367 VLAN_DEV_INFO(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368
Patrick McHardy07b5b172007-06-13 12:07:54 -0700369 new_dev->rtnl_link_ops = &vlan_link_ops;
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700370 err = register_vlan_dev(new_dev);
371 if (err < 0)
Patrick McHardye89fe422007-06-13 12:06:29 -0700372 goto out_free_newdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700374 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376out_free_newdev:
377 free_netdev(new_dev);
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700378 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379}
380
Patrick McHardy8c979c22007-07-11 19:45:24 -0700381static void vlan_sync_address(struct net_device *dev,
382 struct net_device *vlandev)
383{
384 struct vlan_dev_info *vlan = VLAN_DEV_INFO(vlandev);
385
386 /* May be called without an actual change */
387 if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
388 return;
389
390 /* vlan address was different from the old address and is equal to
391 * the new address */
392 if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
393 !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
394 dev_unicast_delete(dev, vlandev->dev_addr, ETH_ALEN);
395
396 /* vlan address was equal to the old address and is different from
397 * the new address */
398 if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
399 compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
400 dev_unicast_add(dev, vlandev->dev_addr, ETH_ALEN);
401
402 memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
403}
404
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405static int vlan_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
406{
407 struct net_device *dev = ptr;
408 struct vlan_group *grp = __vlan_find_group(dev->ifindex);
409 int i, flgs;
410 struct net_device *vlandev;
411
Eric W. Biedermane9dc8652007-09-12 13:02:17 +0200412 if (dev->nd_net != &init_net)
413 return NOTIFY_DONE;
414
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 if (!grp)
416 goto out;
417
418 /* It is OK that we do not hold the group lock right now,
419 * as we run under the RTNL lock.
420 */
421
422 switch (event) {
423 case NETDEV_CHANGE:
424 /* Propagate real device state to vlan devices */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
Dan Aloni5c15bde2007-03-02 20:44:51 -0800426 vlandev = vlan_group_get_device(grp, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 if (!vlandev)
428 continue;
429
Stefan Rompfddd7bf92006-03-20 17:11:41 -0800430 vlan_transfer_operstate(dev, vlandev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 }
432 break;
433
Patrick McHardy8c979c22007-07-11 19:45:24 -0700434 case NETDEV_CHANGEADDR:
435 /* Adjust unicast filters on underlying device */
436 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
437 vlandev = vlan_group_get_device(grp, i);
438 if (!vlandev)
439 continue;
440
Patrick McHardyd932e042007-11-10 21:51:40 -0800441 flgs = vlandev->flags;
442 if (!(flgs & IFF_UP))
443 continue;
444
Patrick McHardy8c979c22007-07-11 19:45:24 -0700445 vlan_sync_address(dev, vlandev);
446 }
447 break;
448
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 case NETDEV_DOWN:
450 /* Put all VLANs for this dev in the down state too. */
451 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
Dan Aloni5c15bde2007-03-02 20:44:51 -0800452 vlandev = vlan_group_get_device(grp, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 if (!vlandev)
454 continue;
455
456 flgs = vlandev->flags;
457 if (!(flgs & IFF_UP))
458 continue;
459
460 dev_change_flags(vlandev, flgs & ~IFF_UP);
461 }
462 break;
463
464 case NETDEV_UP:
465 /* Put all VLANs for this dev in the up state too. */
466 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
Dan Aloni5c15bde2007-03-02 20:44:51 -0800467 vlandev = vlan_group_get_device(grp, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468 if (!vlandev)
469 continue;
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +0900470
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 flgs = vlandev->flags;
472 if (flgs & IFF_UP)
473 continue;
474
475 dev_change_flags(vlandev, flgs | IFF_UP);
476 }
477 break;
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +0900478
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 case NETDEV_UNREGISTER:
480 /* Delete all VLANs for this dev. */
481 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
482 int ret;
483
Dan Aloni5c15bde2007-03-02 20:44:51 -0800484 vlandev = vlan_group_get_device(grp, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 if (!vlandev)
486 continue;
487
488 ret = unregister_vlan_dev(dev,
489 VLAN_DEV_INFO(vlandev)->vlan_id);
490
491 unregister_netdevice(vlandev);
492
493 /* Group was destroyed? */
494 if (ret == 1)
495 break;
496 }
497 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700498 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499
500out:
501 return NOTIFY_DONE;
502}
503
Patrick McHardy69ab4b72008-01-21 00:25:15 -0800504static struct notifier_block vlan_notifier_block __read_mostly = {
505 .notifier_call = vlan_device_event,
506};
507
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508/*
509 * VLAN IOCTL handler.
510 * o execute requested action or pass command to the device driver
511 * arg is really a struct vlan_ioctl_args __user *.
512 */
Eric W. Biederman881d9662007-09-17 11:56:21 -0700513static int vlan_ioctl_handler(struct net *net, void __user *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514{
Patrick McHardyc17d8872007-06-13 12:05:22 -0700515 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 unsigned short vid = 0;
517 struct vlan_ioctl_args args;
Patrick McHardyc17d8872007-06-13 12:05:22 -0700518 struct net_device *dev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519
520 if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
521 return -EFAULT;
522
523 /* Null terminate this sucker, just in case. */
524 args.device1[23] = 0;
525 args.u.device2[23] = 0;
526
Patrick McHardyc17d8872007-06-13 12:05:22 -0700527 rtnl_lock();
528
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529 switch (args.cmd) {
530 case SET_VLAN_INGRESS_PRIORITY_CMD:
Patrick McHardyc17d8872007-06-13 12:05:22 -0700531 case SET_VLAN_EGRESS_PRIORITY_CMD:
532 case SET_VLAN_FLAG_CMD:
533 case ADD_VLAN_CMD:
534 case DEL_VLAN_CMD:
535 case GET_VLAN_REALDEV_NAME_CMD:
536 case GET_VLAN_VID_CMD:
537 err = -ENODEV;
Eric W. Biederman881d9662007-09-17 11:56:21 -0700538 dev = __dev_get_by_name(&init_net, args.device1);
Patrick McHardyc17d8872007-06-13 12:05:22 -0700539 if (!dev)
540 goto out;
541
542 err = -EINVAL;
543 if (args.cmd != ADD_VLAN_CMD &&
544 !(dev->priv_flags & IFF_802_1Q_VLAN))
545 goto out;
546 }
547
548 switch (args.cmd) {
549 case SET_VLAN_INGRESS_PRIORITY_CMD:
550 err = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 if (!capable(CAP_NET_ADMIN))
Patrick McHardyc17d8872007-06-13 12:05:22 -0700552 break;
553 vlan_dev_set_ingress_priority(dev,
554 args.u.skb_priority,
555 args.vlan_qos);
Patrick McHardyfffe4702007-11-07 01:31:32 -0800556 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 break;
558
559 case SET_VLAN_EGRESS_PRIORITY_CMD:
Patrick McHardyc17d8872007-06-13 12:05:22 -0700560 err = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 if (!capable(CAP_NET_ADMIN))
Patrick McHardyc17d8872007-06-13 12:05:22 -0700562 break;
563 err = vlan_dev_set_egress_priority(dev,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564 args.u.skb_priority,
565 args.vlan_qos);
566 break;
567
568 case SET_VLAN_FLAG_CMD:
Patrick McHardyc17d8872007-06-13 12:05:22 -0700569 err = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 if (!capable(CAP_NET_ADMIN))
Patrick McHardyc17d8872007-06-13 12:05:22 -0700571 break;
572 err = vlan_dev_set_vlan_flag(dev,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 args.u.flag,
574 args.vlan_qos);
575 break;
576
577 case SET_VLAN_NAME_TYPE_CMD:
Patrick McHardyc17d8872007-06-13 12:05:22 -0700578 err = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579 if (!capable(CAP_NET_ADMIN))
Pavel Emelyanove35de022007-12-06 22:52:16 -0800580 break;
Patrick McHardyc17d8872007-06-13 12:05:22 -0700581 if ((args.u.name_type >= 0) &&
582 (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583 vlan_name_type = args.u.name_type;
584 err = 0;
585 } else {
586 err = -EINVAL;
587 }
588 break;
589
590 case ADD_VLAN_CMD:
Patrick McHardyc17d8872007-06-13 12:05:22 -0700591 err = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592 if (!capable(CAP_NET_ADMIN))
Patrick McHardyc17d8872007-06-13 12:05:22 -0700593 break;
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700594 err = register_vlan_device(dev, args.u.VID);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595 break;
596
597 case DEL_VLAN_CMD:
Patrick McHardyc17d8872007-06-13 12:05:22 -0700598 err = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599 if (!capable(CAP_NET_ADMIN))
Patrick McHardyc17d8872007-06-13 12:05:22 -0700600 break;
601 err = unregister_vlan_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602 break;
603
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604 case GET_VLAN_REALDEV_NAME_CMD:
Andrew Morton3f5f4342007-07-24 15:37:11 -0700605 err = 0;
Patrick McHardyc17d8872007-06-13 12:05:22 -0700606 vlan_dev_get_realdev_name(dev, args.u.device2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 if (copy_to_user(arg, &args,
608 sizeof(struct vlan_ioctl_args))) {
609 err = -EFAULT;
610 }
611 break;
612
613 case GET_VLAN_VID_CMD:
Andrew Morton3f5f4342007-07-24 15:37:11 -0700614 err = 0;
Patrick McHardyc17d8872007-06-13 12:05:22 -0700615 vlan_dev_get_vid(dev, &vid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616 args.u.VID = vid;
617 if (copy_to_user(arg, &args,
618 sizeof(struct vlan_ioctl_args))) {
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +0900619 err = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620 }
621 break;
622
623 default:
Patrick McHardy198a2912008-01-21 00:24:59 -0800624 err = -EOPNOTSUPP;
Patrick McHardyc17d8872007-06-13 12:05:22 -0700625 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700626 }
Mika Kukkonen7eb1b3d2005-12-21 18:39:49 -0800627out:
Patrick McHardyc17d8872007-06-13 12:05:22 -0700628 rtnl_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629 return err;
630}
631
Patrick McHardy69ab4b72008-01-21 00:25:15 -0800632static int __init vlan_proto_init(void)
633{
634 int err;
635
636 pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright);
637 pr_info("All bugs added by %s\n", vlan_buggyright);
638
639 err = vlan_proc_init();
640 if (err < 0)
641 goto err1;
642
643 err = register_netdevice_notifier(&vlan_notifier_block);
644 if (err < 0)
645 goto err2;
646
647 err = vlan_netlink_init();
648 if (err < 0)
649 goto err3;
650
651 dev_add_pack(&vlan_packet_type);
652 vlan_ioctl_set(vlan_ioctl_handler);
653 return 0;
654
655err3:
656 unregister_netdevice_notifier(&vlan_notifier_block);
657err2:
658 vlan_proc_cleanup();
659err1:
660 return err;
661}
662
663static void __exit vlan_cleanup_module(void)
664{
665 unsigned int i;
666
667 vlan_ioctl_set(NULL);
668 vlan_netlink_fini();
669
670 unregister_netdevice_notifier(&vlan_notifier_block);
671
672 dev_remove_pack(&vlan_packet_type);
673
674 /* This table must be empty if there are no module references left. */
675 for (i = 0; i < VLAN_GRP_HASH_SIZE; i++)
676 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
677
678 vlan_proc_cleanup();
679
680 synchronize_net();
681}
682
683module_init(vlan_proto_init);
684module_exit(vlan_cleanup_module);
685
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686MODULE_LICENSE("GPL");
687MODULE_VERSION(DRV_VERSION);