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[NET]: Fix comparisons of unsigned < 0.
[linux-block.git] / net / 8021q / vlan.c
CommitLineData
1da177e4
LT		 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
122952fc 8 *
1da177e4
LT		 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 */
4fc268d2 22#include <linux/capability.h>
1da177e4
LT		 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) */
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
1da177e4
LT		 70/* End of global variables definitions. */
71
72/*
73 * Function vlan_proto_init (pro)
74 *
122952fc 75 * Initialize VLAN protocol layer,
1da177e4
LT		 76 *
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) {
122952fc 90 printk(KERN_ERR
1da177e4
LT		 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
122952fc 111/* Cleanup all vlan devices
1da177e4
LT		 112 * Note: devices that have been registered that but not
113 * brought up will exist but have no module ref count.
114 */
115static void __exit vlan_cleanup_devices(void)
116{
117 struct net_device *dev, *nxt;
118
119 rtnl_lock();
7562f876 120 for_each_netdev_safe(dev, nxt) {
1da177e4
LT		 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.
122952fc 134 */
1da177e4
LT		 135static 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
158module_init(vlan_proto_init);
159module_exit(vlan_cleanup_module);
160
161/* Must be invoked with RCU read lock (no preempt) */
162static 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 */
180struct 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)
5c15bdec 186 return vlan_group_get_device(grp, VID);
1da177e4
LT		 187
188 return NULL;
189}
190
5c15bdec
DA		 191static 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
1da177e4
LT		 200static void vlan_rcu_free(struct rcu_head *rcu)
201{
5c15bdec 202 vlan_group_free(container_of(rcu, struct vlan_group, rcu));
1da177e4
LT		 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 */
212static 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) {
5c15bdec 234 dev = vlan_group_get_device(grp, vlan_id);
1da177e4
LT		 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 */
d2d1acdb 243 if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
1da177e4 244 real_dev->vlan_rx_kill_vid(real_dev, vlan_id);
1da177e4 245
5c15bdec 246 vlan_group_set_device(grp, vlan_id, NULL);
1da177e4
LT		 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++)
5c15bdec 260 if (vlan_group_get_device(grp, i))
1da177e4
LT		 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
122952fc 278 return ret;
1da177e4
LT		 279}
280
281static int unregister_vlan_device(const char *vlan_IF_name)
282{
283 struct net_device *dev = NULL;
284 int ret;
285
286
287 dev = dev_get_by_name(vlan_IF_name);
288 ret = -EINVAL;
289 if (dev) {
290 if (dev->priv_flags & IFF_802_1Q_VLAN) {
291 rtnl_lock();
292
293 ret = unregister_vlan_dev(VLAN_DEV_INFO(dev)->real_dev,
294 VLAN_DEV_INFO(dev)->vlan_id);
295
296 dev_put(dev);
297 unregister_netdevice(dev);
298
299 rtnl_unlock();
300
301 if (ret == 1)
302 ret = 0;
303 } else {
122952fc 304 printk(VLAN_ERR
1da177e4
LT		 305 "%s: ERROR: Tried to remove a non-vlan device "
306 "with VLAN code, name: %s priv_flags: %hX\n",
307 __FUNCTION__, dev->name, dev->priv_flags);
308 dev_put(dev);
309 ret = -EPERM;
310 }
311 } else {
312#ifdef VLAN_DEBUG
313 printk(VLAN_DBG "%s: WARNING: Could not find dev.\n", __FUNCTION__);
314#endif
315 ret = -EINVAL;
316 }
317
318 return ret;
319}
320
321static void vlan_setup(struct net_device *new_dev)
322{
323 SET_MODULE_OWNER(new_dev);
122952fc 324
1da177e4
LT		 325 /* new_dev->ifindex = 0; it will be set when added to
326 * the global list.
327 * iflink is set as well.
328 */
329 new_dev->get_stats = vlan_dev_get_stats;
330
331 /* Make this thing known as a VLAN device */
332 new_dev->priv_flags |= IFF_802_1Q_VLAN;
122952fc 333
1da177e4
LT		 334 /* Set us up to have no queue, as the underlying Hardware device
335 * can do all the queueing we could want.
336 */
337 new_dev->tx_queue_len = 0;
338
339 /* set up method calls */
340 new_dev->change_mtu = vlan_dev_change_mtu;
341 new_dev->open = vlan_dev_open;
342 new_dev->stop = vlan_dev_stop;
343 new_dev->set_mac_address = vlan_dev_set_mac_address;
344 new_dev->set_multicast_list = vlan_dev_set_multicast_list;
345 new_dev->destructor = free_netdev;
346 new_dev->do_ioctl = vlan_dev_ioctl;
347}
348
ddd7bf9f
SR		 349static void vlan_transfer_operstate(const struct net_device *dev, struct net_device *vlandev)
350{
351 /* Have to respect userspace enforced dormant state
352 * of real device, also must allow supplicant running
353 * on VLAN device
354 */
355 if (dev->operstate == IF_OPER_DORMANT)
356 netif_dormant_on(vlandev);
357 else
358 netif_dormant_off(vlandev);
359
360 if (netif_carrier_ok(dev)) {
361 if (!netif_carrier_ok(vlandev))
362 netif_carrier_on(vlandev);
363 } else {
364 if (netif_carrier_ok(vlandev))
365 netif_carrier_off(vlandev);
366 }
367}
368
5dd8d1e9
AV		 369/*
370 * vlan network devices have devices nesting below it, and are a special
371 * "super class" of normal network devices; split their locks off into a
372 * separate class since they always nest.
373 */
374static struct lock_class_key vlan_netdev_xmit_lock_key;
375
376
1da177e4
LT		 377/* Attach a VLAN device to a mac address (ie Ethernet Card).
378 * Returns the device that was created, or NULL if there was
379 * an error of some kind.
380 */
381static struct net_device *register_vlan_device(const char *eth_IF_name,
382 unsigned short VLAN_ID)
383{
384 struct vlan_group *grp;
385 struct net_device *new_dev;
386 struct net_device *real_dev; /* the ethernet device */
387 char name[IFNAMSIZ];
5c15bdec 388 int i;
1da177e4
LT		 389
390#ifdef VLAN_DEBUG
391 printk(VLAN_DBG "%s: if_name -:%s:- vid: %i\n",
392 __FUNCTION__, eth_IF_name, VLAN_ID);
393#endif
394
395 if (VLAN_ID >= VLAN_VID_MASK)
396 goto out_ret_null;
397
398 /* find the device relating to eth_IF_name. */
399 real_dev = dev_get_by_name(eth_IF_name);
400 if (!real_dev)
401 goto out_ret_null;
402
403 if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
404 printk(VLAN_DBG "%s: VLANs not supported on %s.\n",
405 __FUNCTION__, real_dev->name);
406 goto out_put_dev;
407 }
408
409 if ((real_dev->features & NETIF_F_HW_VLAN_RX) &&
d2d1acdb 410 !real_dev->vlan_rx_register) {
1da177e4
LT		 411 printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
412 __FUNCTION__, real_dev->name);
413 goto out_put_dev;
414 }
415
416 if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
d2d1acdb 417 (!real_dev->vlan_rx_add_vid || !real_dev->vlan_rx_kill_vid)) {
1da177e4
LT		 418 printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
419 __FUNCTION__, real_dev->name);
420 goto out_put_dev;
421 }
422
423 /* From this point on, all the data structures must remain
424 * consistent.
425 */
426 rtnl_lock();
427
428 /* The real device must be up and operating in order to
429 * assosciate a VLAN device with it.
430 */
431 if (!(real_dev->flags & IFF_UP))
432 goto out_unlock;
433
434 if (__find_vlan_dev(real_dev, VLAN_ID) != NULL) {
435 /* was already registered. */
436 printk(VLAN_DBG "%s: ALREADY had VLAN registered\n", __FUNCTION__);
437 goto out_unlock;
438 }
439
440 /* Gotta set up the fields for the device. */
441#ifdef VLAN_DEBUG
442 printk(VLAN_DBG "About to allocate name, vlan_name_type: %i\n",
443 vlan_name_type);
444#endif
445 switch (vlan_name_type) {
446 case VLAN_NAME_TYPE_RAW_PLUS_VID:
447 /* name will look like: eth1.0005 */
448 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, VLAN_ID);
449 break;
450 case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
451 /* Put our vlan.VID in the name.
452 * Name will look like: vlan5
453 */
454 snprintf(name, IFNAMSIZ, "vlan%i", VLAN_ID);
455 break;
456 case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
457 /* Put our vlan.VID in the name.
458 * Name will look like: eth0.5
459 */
460 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, VLAN_ID);
461 break;
462 case VLAN_NAME_TYPE_PLUS_VID:
463 /* Put our vlan.VID in the name.
464 * Name will look like: vlan0005
465 */
466 default:
467 snprintf(name, IFNAMSIZ, "vlan%.4i", VLAN_ID);
3ff50b79 468 }
122952fc 469
1da177e4
LT		 470 new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
471 vlan_setup);
5dd8d1e9 472
1da177e4
LT		 473 if (new_dev == NULL)
474 goto out_unlock;
475
476#ifdef VLAN_DEBUG
477 printk(VLAN_DBG "Allocated new name -:%s:-\n", new_dev->name);
478#endif
479 /* IFF_BROADCAST|IFF_MULTICAST; ??? */
480 new_dev->flags = real_dev->flags;
481 new_dev->flags &= ~IFF_UP;
482
6c753c3d
SR		 483 new_dev->state = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
484 (1<<__LINK_STATE_DORMANT))) |
122952fc 485 (1<<__LINK_STATE_PRESENT);
1da177e4
LT		 486
487 /* need 4 bytes for extra VLAN header info,
488 * hope the underlying device can handle it.
489 */
490 new_dev->mtu = real_dev->mtu;
491
492 /* TODO: maybe just assign it to be ETHERNET? */
493 new_dev->type = real_dev->type;
494
495 new_dev->hard_header_len = real_dev->hard_header_len;
496 if (!(real_dev->features & NETIF_F_HW_VLAN_TX)) {
497 /* Regular ethernet + 4 bytes (18 total). */
498 new_dev->hard_header_len += VLAN_HLEN;
499 }
500
501 VLAN_MEM_DBG("new_dev->priv malloc, addr: %p size: %i\n",
502 new_dev->priv,
503 sizeof(struct vlan_dev_info));
122952fc 504
1da177e4
LT		 505 memcpy(new_dev->broadcast, real_dev->broadcast, real_dev->addr_len);
506 memcpy(new_dev->dev_addr, real_dev->dev_addr, real_dev->addr_len);
507 new_dev->addr_len = real_dev->addr_len;
508
509 if (real_dev->features & NETIF_F_HW_VLAN_TX) {
510 new_dev->hard_header = real_dev->hard_header;
511 new_dev->hard_start_xmit = vlan_dev_hwaccel_hard_start_xmit;
512 new_dev->rebuild_header = real_dev->rebuild_header;
513 } else {
514 new_dev->hard_header = vlan_dev_hard_header;
515 new_dev->hard_start_xmit = vlan_dev_hard_start_xmit;
516 new_dev->rebuild_header = vlan_dev_rebuild_header;
517 }
518 new_dev->hard_header_parse = real_dev->hard_header_parse;
519
520 VLAN_DEV_INFO(new_dev)->vlan_id = VLAN_ID; /* 1 through VLAN_VID_MASK */
521 VLAN_DEV_INFO(new_dev)->real_dev = real_dev;
522 VLAN_DEV_INFO(new_dev)->dent = NULL;
523 VLAN_DEV_INFO(new_dev)->flags = 1;
524
525#ifdef VLAN_DEBUG
526 printk(VLAN_DBG "About to go find the group for idx: %i\n",
527 real_dev->ifindex);
528#endif
122952fc 529
1da177e4
LT		 530 if (register_netdevice(new_dev))
531 goto out_free_newdev;
532
5dd8d1e9
AV		 533 lockdep_set_class(&new_dev->_xmit_lock, &vlan_netdev_xmit_lock_key);
534
ddd7bf9f
SR		 535 new_dev->iflink = real_dev->ifindex;
536 vlan_transfer_operstate(real_dev, new_dev);
537 linkwatch_fire_event(new_dev); /* _MUST_ call rfc2863_policy() */
538
1da177e4
LT		 539 /* So, got the sucker initialized, now lets place
540 * it into our local structure.
541 */
542 grp = __vlan_find_group(real_dev->ifindex);
543
544 /* Note, we are running under the RTNL semaphore
545 * so it cannot "appear" on us.
546 */
547 if (!grp) { /* need to add a new group */
0da974f4 548 grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
1da177e4
LT		 549 if (!grp)
550 goto out_free_unregister;
122952fc 551
5c15bdec
DA		 552 for (i=0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++) {
553 grp->vlan_devices_arrays[i] = kzalloc(
554 sizeof(struct net_device *)*VLAN_GROUP_ARRAY_PART_LEN,
555 GFP_KERNEL);
556
557 if (!grp->vlan_devices_arrays[i])
558 goto out_free_arrays;
559 }
560
1da177e4 561 /* printk(KERN_ALERT "VLAN REGISTER: Allocated new group.\n"); */
1da177e4
LT		 562 grp->real_dev_ifindex = real_dev->ifindex;
563
122952fc 564 hlist_add_head_rcu(&grp->hlist,
1da177e4
LT		 565 &vlan_group_hash[vlan_grp_hashfn(real_dev->ifindex)]);
566
567 if (real_dev->features & NETIF_F_HW_VLAN_RX)
568 real_dev->vlan_rx_register(real_dev, grp);
569 }
122952fc 570
5c15bdec 571 vlan_group_set_device(grp, VLAN_ID, new_dev);
1da177e4
LT		 572
573 if (vlan_proc_add_dev(new_dev)<0)/* create it's proc entry */
122952fc
YH		 574 printk(KERN_WARNING "VLAN: failed to add proc entry for %s\n",
575 new_dev->name);
1da177e4
LT		 576
577 if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
578 real_dev->vlan_rx_add_vid(real_dev, VLAN_ID);
579
580 rtnl_unlock();
581
582
583#ifdef VLAN_DEBUG
584 printk(VLAN_DBG "Allocated new device successfully, returning.\n");
585#endif
586 return new_dev;
587
5c15bdec
DA		 588out_free_arrays:
589 vlan_group_free(grp);
590
1da177e4
LT		 591out_free_unregister:
592 unregister_netdev(new_dev);
593 goto out_unlock;
594
595out_free_newdev:
596 free_netdev(new_dev);
597
598out_unlock:
599 rtnl_unlock();
600
601out_put_dev:
602 dev_put(real_dev);
603
604out_ret_null:
605 return NULL;
606}
607
608static int vlan_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
609{
610 struct net_device *dev = ptr;
611 struct vlan_group *grp = __vlan_find_group(dev->ifindex);
612 int i, flgs;
613 struct net_device *vlandev;
614
615 if (!grp)
616 goto out;
617
618 /* It is OK that we do not hold the group lock right now,
619 * as we run under the RTNL lock.
620 */
621
622 switch (event) {
623 case NETDEV_CHANGE:
624 /* Propagate real device state to vlan devices */
1da177e4 625 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
5c15bdec 626 vlandev = vlan_group_get_device(grp, i);
1da177e4
LT		 627 if (!vlandev)
628 continue;
629
ddd7bf9f 630 vlan_transfer_operstate(dev, vlandev);
1da177e4
LT		 631 }
632 break;
633
634 case NETDEV_DOWN:
635 /* Put all VLANs for this dev in the down state too. */
636 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
5c15bdec 637 vlandev = vlan_group_get_device(grp, i);
1da177e4
LT		 638 if (!vlandev)
639 continue;
640
641 flgs = vlandev->flags;
642 if (!(flgs & IFF_UP))
643 continue;
644
645 dev_change_flags(vlandev, flgs & ~IFF_UP);
646 }
647 break;
648
649 case NETDEV_UP:
650 /* Put all VLANs for this dev in the up state too. */
651 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
5c15bdec 652 vlandev = vlan_group_get_device(grp, i);
1da177e4
LT		 653 if (!vlandev)
654 continue;
122952fc 655
1da177e4
LT		 656 flgs = vlandev->flags;
657 if (flgs & IFF_UP)
658 continue;
659
660 dev_change_flags(vlandev, flgs | IFF_UP);
661 }
662 break;
122952fc 663
1da177e4
LT		 664 case NETDEV_UNREGISTER:
665 /* Delete all VLANs for this dev. */
666 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
667 int ret;
668
5c15bdec 669 vlandev = vlan_group_get_device(grp, i);
1da177e4
LT		 670 if (!vlandev)
671 continue;
672
673 ret = unregister_vlan_dev(dev,
674 VLAN_DEV_INFO(vlandev)->vlan_id);
675
676 unregister_netdevice(vlandev);
677
678 /* Group was destroyed? */
679 if (ret == 1)
680 break;
681 }
682 break;
3ff50b79 683 }
1da177e4
LT		 684
685out:
686 return NOTIFY_DONE;
687}
688
689/*
690 * VLAN IOCTL handler.
691 * o execute requested action or pass command to the device driver
692 * arg is really a struct vlan_ioctl_args __user *.
693 */
694static int vlan_ioctl_handler(void __user *arg)
695{
696 int err = 0;
697 unsigned short vid = 0;
698 struct vlan_ioctl_args args;
699
700 if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
701 return -EFAULT;
702
703 /* Null terminate this sucker, just in case. */
704 args.device1[23] = 0;
705 args.u.device2[23] = 0;
706
707#ifdef VLAN_DEBUG
708 printk(VLAN_DBG "%s: args.cmd: %x\n", __FUNCTION__, args.cmd);
709#endif
710
711 switch (args.cmd) {
712 case SET_VLAN_INGRESS_PRIORITY_CMD:
713 if (!capable(CAP_NET_ADMIN))
714 return -EPERM;
715 err = vlan_dev_set_ingress_priority(args.device1,
716 args.u.skb_priority,
717 args.vlan_qos);
718 break;
719
720 case SET_VLAN_EGRESS_PRIORITY_CMD:
721 if (!capable(CAP_NET_ADMIN))
722 return -EPERM;
723 err = vlan_dev_set_egress_priority(args.device1,
724 args.u.skb_priority,
725 args.vlan_qos);
726 break;
727
728 case SET_VLAN_FLAG_CMD:
729 if (!capable(CAP_NET_ADMIN))
730 return -EPERM;
731 err = vlan_dev_set_vlan_flag(args.device1,
732 args.u.flag,
733 args.vlan_qos);
734 break;
735
736 case SET_VLAN_NAME_TYPE_CMD:
737 if (!capable(CAP_NET_ADMIN))
738 return -EPERM;
75202e76 739 if (args.u.name_type < VLAN_NAME_TYPE_HIGHEST) {
1da177e4
LT		 740 vlan_name_type = args.u.name_type;
741 err = 0;
742 } else {
743 err = -EINVAL;
744 }
745 break;
746
747 case ADD_VLAN_CMD:
748 if (!capable(CAP_NET_ADMIN))
749 return -EPERM;
750 /* we have been given the name of the Ethernet Device we want to
751 * talk to: args.dev1 We also have the
752 * VLAN ID: args.u.VID
753 */
754 if (register_vlan_device(args.device1, args.u.VID)) {
755 err = 0;
756 } else {
757 err = -EINVAL;
758 }
759 break;
760
761 case DEL_VLAN_CMD:
762 if (!capable(CAP_NET_ADMIN))
763 return -EPERM;
764 /* Here, the args.dev1 is the actual VLAN we want
765 * to get rid of.
766 */
767 err = unregister_vlan_device(args.device1);
768 break;
769
770 case GET_VLAN_INGRESS_PRIORITY_CMD:
771 /* TODO: Implement
772 err = vlan_dev_get_ingress_priority(args);
773 if (copy_to_user((void*)arg, &args,
122952fc
YH		 774 sizeof(struct vlan_ioctl_args))) {
775 err = -EFAULT;
1da177e4
LT		 776 }
777 */
778 err = -EINVAL;
779 break;
780 case GET_VLAN_EGRESS_PRIORITY_CMD:
781 /* TODO: Implement
782 err = vlan_dev_get_egress_priority(args.device1, &(args.args);
783 if (copy_to_user((void*)arg, &args,
122952fc
YH		 784 sizeof(struct vlan_ioctl_args))) {
785 err = -EFAULT;
1da177e4
LT		 786 }
787 */
788 err = -EINVAL;
789 break;
790 case GET_VLAN_REALDEV_NAME_CMD:
791 err = vlan_dev_get_realdev_name(args.device1, args.u.device2);
7eb1b3d3
MK		 792 if (err)
793 goto out;
1da177e4
LT		 794 if (copy_to_user(arg, &args,
795 sizeof(struct vlan_ioctl_args))) {
796 err = -EFAULT;
797 }
798 break;
799
800 case GET_VLAN_VID_CMD:
801 err = vlan_dev_get_vid(args.device1, &vid);
7eb1b3d3
MK		 802 if (err)
803 goto out;
1da177e4
LT		 804 args.u.VID = vid;
805 if (copy_to_user(arg, &args,
806 sizeof(struct vlan_ioctl_args))) {
122952fc 807 err = -EFAULT;
1da177e4
LT		 808 }
809 break;
810
811 default:
812 /* pass on to underlying device instead?? */
813 printk(VLAN_DBG "%s: Unknown VLAN CMD: %x \n",
814 __FUNCTION__, args.cmd);
815 return -EINVAL;
3ff50b79 816 }
7eb1b3d3 817out:
1da177e4
LT		 818 return err;
819}
820
821MODULE_LICENSE("GPL");
822MODULE_VERSION(DRV_VERSION);
Linux 6.x block layer and io_uring tree(s)