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54f22d820ef5713c2e39e44a86cd58c87514445b
[deliverable/linux.git] / net / 8021q / vlan.c
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: netdev@vger.kernel.org
7 * VLAN Home Page: http://www.candelatech.com/~greear/vlan.html
8 *
9 * Fixes:
10 * Fix for packet capture - Nick Eggleston <nick@dccinc.com>;
11 * Add HW acceleration hooks - David S. Miller <davem@redhat.com>;
12 * Correct all the locking - David S. Miller <davem@redhat.com>;
13 * Use hash table for VLAN groups - David S. Miller <davem@redhat.com>
14 *
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License
17 * as published by the Free Software Foundation; either version
18 * 2 of the License, or (at your option) any later version.
19 */
20
21 #include <linux/capability.h>
22 #include <linux/module.h>
23 #include <linux/netdevice.h>
24 #include <linux/skbuff.h>
25 #include <linux/slab.h>
26 #include <linux/init.h>
27 #include <linux/rculist.h>
28 #include <net/p8022.h>
29 #include <net/arp.h>
30 #include <linux/rtnetlink.h>
31 #include <linux/notifier.h>
32 #include <net/rtnetlink.h>
33 #include <net/net_namespace.h>
34 #include <net/netns/generic.h>
35 #include <asm/uaccess.h>
36
37 #include <linux/if_vlan.h>
38 #include "vlan.h"
39 #include "vlanproc.h"
40
41 #define DRV_VERSION "1.8"
42
43 /* Global VLAN variables */
44
45 int vlan_net_id __read_mostly;
46
47 /* Our listing of VLAN group(s) */
48 static struct hlist_head vlan_group_hash[VLAN_GRP_HASH_SIZE];
49
50 const char vlan_fullname[] = "802.1Q VLAN Support";
51 const char vlan_version[] = DRV_VERSION;
52 static const char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>";
53 static const char vlan_buggyright[] = "David S. Miller <davem@redhat.com>";
54
55 static struct packet_type vlan_packet_type __read_mostly = {
56 .type = cpu_to_be16(ETH_P_8021Q),
57 .func = vlan_skb_recv, /* VLAN receive method */
58 };
59
60 /* End of global variables definitions. */
61
62 static inline unsigned int vlan_grp_hashfn(unsigned int idx)
63 {
64 return ((idx >> VLAN_GRP_HASH_SHIFT) ^ idx) & VLAN_GRP_HASH_MASK;
65 }
66
67 /* Must be invoked with RCU read lock (no preempt) */
68 static struct vlan_group *__vlan_find_group(struct net_device *real_dev)
69 {
70 struct vlan_group *grp;
71 struct hlist_node *n;
72 int hash = vlan_grp_hashfn(real_dev->ifindex);
73
74 hlist_for_each_entry_rcu(grp, n, &vlan_group_hash[hash], hlist) {
75 if (grp->real_dev == real_dev)
76 return grp;
77 }
78
79 return NULL;
80 }
81
82 /* Find the protocol handler. Assumes VID < VLAN_VID_MASK.
83 *
84 * Must be invoked with RCU read lock (no preempt)
85 */
86 struct net_device *__find_vlan_dev(struct net_device *real_dev, u16 vlan_id)
87 {
88 struct vlan_group *grp = __vlan_find_group(real_dev);
89
90 if (grp)
91 return vlan_group_get_device(grp, vlan_id);
92
93 return NULL;
94 }
95
96 static void vlan_group_free(struct vlan_group *grp)
97 {
98 int i;
99
100 for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
101 kfree(grp->vlan_devices_arrays[i]);
102 kfree(grp);
103 }
104
105 static struct vlan_group *vlan_group_alloc(struct net_device *real_dev)
106 {
107 struct vlan_group *grp;
108
109 grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
110 if (!grp)
111 return NULL;
112
113 grp->real_dev = real_dev;
114 hlist_add_head_rcu(&grp->hlist,
115 &vlan_group_hash[vlan_grp_hashfn(real_dev->ifindex)]);
116 return grp;
117 }
118
119 static int vlan_group_prealloc_vid(struct vlan_group *vg, u16 vlan_id)
120 {
121 struct net_device **array;
122 unsigned int size;
123
124 ASSERT_RTNL();
125
126 array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
127 if (array != NULL)
128 return 0;
129
130 size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
131 array = kzalloc(size, GFP_KERNEL);
132 if (array == NULL)
133 return -ENOBUFS;
134
135 vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN] = array;
136 return 0;
137 }
138
139 static void vlan_rcu_free(struct rcu_head *rcu)
140 {
141 vlan_group_free(container_of(rcu, struct vlan_group, rcu));
142 }
143
144 void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
145 {
146 struct vlan_dev_info *vlan = vlan_dev_info(dev);
147 struct net_device *real_dev = vlan->real_dev;
148 const struct net_device_ops *ops = real_dev->netdev_ops;
149 struct vlan_group *grp;
150 u16 vlan_id = vlan->vlan_id;
151
152 ASSERT_RTNL();
153
154 grp = __vlan_find_group(real_dev);
155 BUG_ON(!grp);
156
157 /* Take it out of our own structures, but be sure to interlock with
158 * HW accelerating devices or SW vlan input packet processing if
159 * VLAN is not 0 (leave it there for 802.1p).
160 */
161 if (vlan_id && (real_dev->features & NETIF_F_HW_VLAN_FILTER))
162 ops->ndo_vlan_rx_kill_vid(real_dev, vlan_id);
163
164 grp->nr_vlans--;
165
166 vlan_group_set_device(grp, vlan_id, NULL);
167 if (!grp->killall)
168 synchronize_net();
169
170 unregister_netdevice_queue(dev, head);
171
172 /* If the group is now empty, kill off the group. */
173 if (grp->nr_vlans == 0) {
174 vlan_gvrp_uninit_applicant(real_dev);
175
176 if (real_dev->features & NETIF_F_HW_VLAN_RX)
177 ops->ndo_vlan_rx_register(real_dev, NULL);
178
179 hlist_del_rcu(&grp->hlist);
180
181 /* Free the group, after all cpu's are done. */
182 call_rcu(&grp->rcu, vlan_rcu_free);
183 }
184
185 /* Get rid of the vlan's reference to real_dev */
186 dev_put(real_dev);
187 }
188
189 int vlan_check_real_dev(struct net_device *real_dev, u16 vlan_id)
190 {
191 const char *name = real_dev->name;
192 const struct net_device_ops *ops = real_dev->netdev_ops;
193
194 if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
195 pr_info("8021q: VLANs not supported on %s\n", name);
196 return -EOPNOTSUPP;
197 }
198
199 if ((real_dev->features & NETIF_F_HW_VLAN_RX) && !ops->ndo_vlan_rx_register) {
200 pr_info("8021q: device %s has buggy VLAN hw accel\n", name);
201 return -EOPNOTSUPP;
202 }
203
204 if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
205 (!ops->ndo_vlan_rx_add_vid || !ops->ndo_vlan_rx_kill_vid)) {
206 pr_info("8021q: Device %s has buggy VLAN hw accel\n", name);
207 return -EOPNOTSUPP;
208 }
209
210 if (__find_vlan_dev(real_dev, vlan_id) != NULL)
211 return -EEXIST;
212
213 return 0;
214 }
215
216 int register_vlan_dev(struct net_device *dev)
217 {
218 struct vlan_dev_info *vlan = vlan_dev_info(dev);
219 struct net_device *real_dev = vlan->real_dev;
220 const struct net_device_ops *ops = real_dev->netdev_ops;
221 u16 vlan_id = vlan->vlan_id;
222 struct vlan_group *grp, *ngrp = NULL;
223 int err;
224
225 grp = __vlan_find_group(real_dev);
226 if (!grp) {
227 ngrp = grp = vlan_group_alloc(real_dev);
228 if (!grp)
229 return -ENOBUFS;
230 err = vlan_gvrp_init_applicant(real_dev);
231 if (err < 0)
232 goto out_free_group;
233 }
234
235 err = vlan_group_prealloc_vid(grp, vlan_id);
236 if (err < 0)
237 goto out_uninit_applicant;
238
239 err = register_netdevice(dev);
240 if (err < 0)
241 goto out_uninit_applicant;
242
243 /* Account for reference in struct vlan_dev_info */
244 dev_hold(real_dev);
245
246 netif_stacked_transfer_operstate(real_dev, dev);
247 linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
248
249 /* So, got the sucker initialized, now lets place
250 * it into our local structure.
251 */
252 vlan_group_set_device(grp, vlan_id, dev);
253 grp->nr_vlans++;
254
255 if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX)
256 ops->ndo_vlan_rx_register(real_dev, ngrp);
257 if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
258 ops->ndo_vlan_rx_add_vid(real_dev, vlan_id);
259
260 return 0;
261
262 out_uninit_applicant:
263 if (ngrp)
264 vlan_gvrp_uninit_applicant(real_dev);
265 out_free_group:
266 if (ngrp) {
267 hlist_del_rcu(&ngrp->hlist);
268 /* Free the group, after all cpu's are done. */
269 call_rcu(&ngrp->rcu, vlan_rcu_free);
270 }
271 return err;
272 }
273
274 /* Attach a VLAN device to a mac address (ie Ethernet Card).
275 * Returns 0 if the device was created or a negative error code otherwise.
276 */
277 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
278 {
279 struct net_device *new_dev;
280 struct net *net = dev_net(real_dev);
281 struct vlan_net *vn = net_generic(net, vlan_net_id);
282 char name[IFNAMSIZ];
283 int err;
284
285 if (vlan_id >= VLAN_VID_MASK)
286 return -ERANGE;
287
288 err = vlan_check_real_dev(real_dev, vlan_id);
289 if (err < 0)
290 return err;
291
292 /* Gotta set up the fields for the device. */
293 switch (vn->name_type) {
294 case VLAN_NAME_TYPE_RAW_PLUS_VID:
295 /* name will look like: eth1.0005 */
296 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
297 break;
298 case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
299 /* Put our vlan.VID in the name.
300 * Name will look like: vlan5
301 */
302 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
303 break;
304 case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
305 /* Put our vlan.VID in the name.
306 * Name will look like: eth0.5
307 */
308 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
309 break;
310 case VLAN_NAME_TYPE_PLUS_VID:
311 /* Put our vlan.VID in the name.
312 * Name will look like: vlan0005
313 */
314 default:
315 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
316 }
317
318 new_dev = alloc_netdev_mq(sizeof(struct vlan_dev_info), name,
319 vlan_setup, real_dev->num_tx_queues);
320
321 if (new_dev == NULL)
322 return -ENOBUFS;
323
324 netif_copy_real_num_queues(new_dev, real_dev);
325 dev_net_set(new_dev, net);
326 /* need 4 bytes for extra VLAN header info,
327 * hope the underlying device can handle it.
328 */
329 new_dev->mtu = real_dev->mtu;
330
331 vlan_dev_info(new_dev)->vlan_id = vlan_id;
332 vlan_dev_info(new_dev)->real_dev = real_dev;
333 vlan_dev_info(new_dev)->dent = NULL;
334 vlan_dev_info(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
335
336 new_dev->rtnl_link_ops = &vlan_link_ops;
337 err = register_vlan_dev(new_dev);
338 if (err < 0)
339 goto out_free_newdev;
340
341 return 0;
342
343 out_free_newdev:
344 free_netdev(new_dev);
345 return err;
346 }
347
348 static void vlan_sync_address(struct net_device *dev,
349 struct net_device *vlandev)
350 {
351 struct vlan_dev_info *vlan = vlan_dev_info(vlandev);
352
353 /* May be called without an actual change */
354 if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
355 return;
356
357 /* vlan address was different from the old address and is equal to
358 * the new address */
359 if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
360 !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
361 dev_uc_del(dev, vlandev->dev_addr);
362
363 /* vlan address was equal to the old address and is different from
364 * the new address */
365 if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
366 compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
367 dev_uc_add(dev, vlandev->dev_addr);
368
369 memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
370 }
371
372 static void vlan_transfer_features(struct net_device *dev,
373 struct net_device *vlandev)
374 {
375 unsigned long old_features = vlandev->features;
376
377 vlandev->features &= ~dev->vlan_features;
378 vlandev->features |= dev->features & dev->vlan_features;
379 vlandev->gso_max_size = dev->gso_max_size;
380 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
381 vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
382 #endif
383 vlandev->real_num_tx_queues = dev->real_num_tx_queues;
384 BUG_ON(vlandev->real_num_tx_queues > vlandev->num_tx_queues);
385
386 if (old_features != vlandev->features)
387 netdev_features_change(vlandev);
388 }
389
390 static void __vlan_device_event(struct net_device *dev, unsigned long event)
391 {
392 switch (event) {
393 case NETDEV_CHANGENAME:
394 vlan_proc_rem_dev(dev);
395 if (vlan_proc_add_dev(dev) < 0)
396 pr_warning("8021q: failed to change proc name for %s\n",
397 dev->name);
398 break;
399 case NETDEV_REGISTER:
400 if (vlan_proc_add_dev(dev) < 0)
401 pr_warning("8021q: failed to add proc entry for %s\n",
402 dev->name);
403 break;
404 case NETDEV_UNREGISTER:
405 vlan_proc_rem_dev(dev);
406 break;
407 }
408 }
409
410 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
411 void *ptr)
412 {
413 struct net_device *dev = ptr;
414 struct vlan_group *grp;
415 int i, flgs;
416 struct net_device *vlandev;
417 struct vlan_dev_info *vlan;
418 LIST_HEAD(list);
419
420 if (is_vlan_dev(dev))
421 __vlan_device_event(dev, event);
422
423 if ((event == NETDEV_UP) &&
424 (dev->features & NETIF_F_HW_VLAN_FILTER) &&
425 dev->netdev_ops->ndo_vlan_rx_add_vid) {
426 pr_info("8021q: adding VLAN 0 to HW filter on device %s\n",
427 dev->name);
428 dev->netdev_ops->ndo_vlan_rx_add_vid(dev, 0);
429 }
430
431 grp = __vlan_find_group(dev);
432 if (!grp)
433 goto out;
434
435 /* It is OK that we do not hold the group lock right now,
436 * as we run under the RTNL lock.
437 */
438
439 switch (event) {
440 case NETDEV_CHANGE:
441 /* Propagate real device state to vlan devices */
442 for (i = 0; i < VLAN_N_VID; i++) {
443 vlandev = vlan_group_get_device(grp, i);
444 if (!vlandev)
445 continue;
446
447 netif_stacked_transfer_operstate(dev, vlandev);
448 }
449 break;
450
451 case NETDEV_CHANGEADDR:
452 /* Adjust unicast filters on underlying device */
453 for (i = 0; i < VLAN_N_VID; i++) {
454 vlandev = vlan_group_get_device(grp, i);
455 if (!vlandev)
456 continue;
457
458 flgs = vlandev->flags;
459 if (!(flgs & IFF_UP))
460 continue;
461
462 vlan_sync_address(dev, vlandev);
463 }
464 break;
465
466 case NETDEV_CHANGEMTU:
467 for (i = 0; i < VLAN_N_VID; i++) {
468 vlandev = vlan_group_get_device(grp, i);
469 if (!vlandev)
470 continue;
471
472 if (vlandev->mtu <= dev->mtu)
473 continue;
474
475 dev_set_mtu(vlandev, dev->mtu);
476 }
477 break;
478
479 case NETDEV_FEAT_CHANGE:
480 /* Propagate device features to underlying device */
481 for (i = 0; i < VLAN_N_VID; i++) {
482 vlandev = vlan_group_get_device(grp, i);
483 if (!vlandev)
484 continue;
485
486 vlan_transfer_features(dev, vlandev);
487 }
488
489 break;
490
491 case NETDEV_DOWN:
492 /* Put all VLANs for this dev in the down state too. */
493 for (i = 0; i < VLAN_N_VID; i++) {
494 vlandev = vlan_group_get_device(grp, i);
495 if (!vlandev)
496 continue;
497
498 flgs = vlandev->flags;
499 if (!(flgs & IFF_UP))
500 continue;
501
502 vlan = vlan_dev_info(vlandev);
503 if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
504 dev_change_flags(vlandev, flgs & ~IFF_UP);
505 netif_stacked_transfer_operstate(dev, vlandev);
506 }
507 break;
508
509 case NETDEV_UP:
510 /* Put all VLANs for this dev in the up state too. */
511 for (i = 0; i < VLAN_N_VID; i++) {
512 vlandev = vlan_group_get_device(grp, i);
513 if (!vlandev)
514 continue;
515
516 flgs = vlandev->flags;
517 if (flgs & IFF_UP)
518 continue;
519
520 vlan = vlan_dev_info(vlandev);
521 if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
522 dev_change_flags(vlandev, flgs | IFF_UP);
523 netif_stacked_transfer_operstate(dev, vlandev);
524 }
525 break;
526
527 case NETDEV_UNREGISTER:
528 /* twiddle thumbs on netns device moves */
529 if (dev->reg_state != NETREG_UNREGISTERING)
530 break;
531
532 /* Delete all VLANs for this dev. */
533 grp->killall = 1;
534
535 for (i = 0; i < VLAN_N_VID; i++) {
536 vlandev = vlan_group_get_device(grp, i);
537 if (!vlandev)
538 continue;
539
540 /* unregistration of last vlan destroys group, abort
541 * afterwards */
542 if (grp->nr_vlans == 1)
543 i = VLAN_N_VID;
544
545 unregister_vlan_dev(vlandev, &list);
546 }
547 unregister_netdevice_many(&list);
548 break;
549
550 case NETDEV_PRE_TYPE_CHANGE:
551 /* Forbid underlaying device to change its type. */
552 return NOTIFY_BAD;
553 }
554
555 out:
556 return NOTIFY_DONE;
557 }
558
559 static struct notifier_block vlan_notifier_block __read_mostly = {
560 .notifier_call = vlan_device_event,
561 };
562
563 /*
564 * VLAN IOCTL handler.
565 * o execute requested action or pass command to the device driver
566 * arg is really a struct vlan_ioctl_args __user *.
567 */
568 static int vlan_ioctl_handler(struct net *net, void __user *arg)
569 {
570 int err;
571 struct vlan_ioctl_args args;
572 struct net_device *dev = NULL;
573
574 if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
575 return -EFAULT;
576
577 /* Null terminate this sucker, just in case. */
578 args.device1[23] = 0;
579 args.u.device2[23] = 0;
580
581 rtnl_lock();
582
583 switch (args.cmd) {
584 case SET_VLAN_INGRESS_PRIORITY_CMD:
585 case SET_VLAN_EGRESS_PRIORITY_CMD:
586 case SET_VLAN_FLAG_CMD:
587 case ADD_VLAN_CMD:
588 case DEL_VLAN_CMD:
589 case GET_VLAN_REALDEV_NAME_CMD:
590 case GET_VLAN_VID_CMD:
591 err = -ENODEV;
592 dev = __dev_get_by_name(net, args.device1);
593 if (!dev)
594 goto out;
595
596 err = -EINVAL;
597 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
598 goto out;
599 }
600
601 switch (args.cmd) {
602 case SET_VLAN_INGRESS_PRIORITY_CMD:
603 err = -EPERM;
604 if (!capable(CAP_NET_ADMIN))
605 break;
606 vlan_dev_set_ingress_priority(dev,
607 args.u.skb_priority,
608 args.vlan_qos);
609 err = 0;
610 break;
611
612 case SET_VLAN_EGRESS_PRIORITY_CMD:
613 err = -EPERM;
614 if (!capable(CAP_NET_ADMIN))
615 break;
616 err = vlan_dev_set_egress_priority(dev,
617 args.u.skb_priority,
618 args.vlan_qos);
619 break;
620
621 case SET_VLAN_FLAG_CMD:
622 err = -EPERM;
623 if (!capable(CAP_NET_ADMIN))
624 break;
625 err = vlan_dev_change_flags(dev,
626 args.vlan_qos ? args.u.flag : 0,
627 args.u.flag);
628 break;
629
630 case SET_VLAN_NAME_TYPE_CMD:
631 err = -EPERM;
632 if (!capable(CAP_NET_ADMIN))
633 break;
634 if ((args.u.name_type >= 0) &&
635 (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
636 struct vlan_net *vn;
637
638 vn = net_generic(net, vlan_net_id);
639 vn->name_type = args.u.name_type;
640 err = 0;
641 } else {
642 err = -EINVAL;
643 }
644 break;
645
646 case ADD_VLAN_CMD:
647 err = -EPERM;
648 if (!capable(CAP_NET_ADMIN))
649 break;
650 err = register_vlan_device(dev, args.u.VID);
651 break;
652
653 case DEL_VLAN_CMD:
654 err = -EPERM;
655 if (!capable(CAP_NET_ADMIN))
656 break;
657 unregister_vlan_dev(dev, NULL);
658 err = 0;
659 break;
660
661 case GET_VLAN_REALDEV_NAME_CMD:
662 err = 0;
663 vlan_dev_get_realdev_name(dev, args.u.device2);
664 if (copy_to_user(arg, &args,
665 sizeof(struct vlan_ioctl_args)))
666 err = -EFAULT;
667 break;
668
669 case GET_VLAN_VID_CMD:
670 err = 0;
671 args.u.VID = vlan_dev_vlan_id(dev);
672 if (copy_to_user(arg, &args,
673 sizeof(struct vlan_ioctl_args)))
674 err = -EFAULT;
675 break;
676
677 default:
678 err = -EOPNOTSUPP;
679 break;
680 }
681 out:
682 rtnl_unlock();
683 return err;
684 }
685
686 static int __net_init vlan_init_net(struct net *net)
687 {
688 struct vlan_net *vn = net_generic(net, vlan_net_id);
689 int err;
690
691 vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
692
693 err = vlan_proc_init(net);
694
695 return err;
696 }
697
698 static void __net_exit vlan_exit_net(struct net *net)
699 {
700 vlan_proc_cleanup(net);
701 }
702
703 static struct pernet_operations vlan_net_ops = {
704 .init = vlan_init_net,
705 .exit = vlan_exit_net,
706 .id = &vlan_net_id,
707 .size = sizeof(struct vlan_net),
708 };
709
710 static int __init vlan_proto_init(void)
711 {
712 int err;
713
714 pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright);
715 pr_info("All bugs added by %s\n", vlan_buggyright);
716
717 err = register_pernet_subsys(&vlan_net_ops);
718 if (err < 0)
719 goto err0;
720
721 err = register_netdevice_notifier(&vlan_notifier_block);
722 if (err < 0)
723 goto err2;
724
725 err = vlan_gvrp_init();
726 if (err < 0)
727 goto err3;
728
729 err = vlan_netlink_init();
730 if (err < 0)
731 goto err4;
732
733 dev_add_pack(&vlan_packet_type);
734 vlan_ioctl_set(vlan_ioctl_handler);
735 return 0;
736
737 err4:
738 vlan_gvrp_uninit();
739 err3:
740 unregister_netdevice_notifier(&vlan_notifier_block);
741 err2:
742 unregister_pernet_subsys(&vlan_net_ops);
743 err0:
744 return err;
745 }
746
747 static void __exit vlan_cleanup_module(void)
748 {
749 unsigned int i;
750
751 vlan_ioctl_set(NULL);
752 vlan_netlink_fini();
753
754 unregister_netdevice_notifier(&vlan_notifier_block);
755
756 dev_remove_pack(&vlan_packet_type);
757
758 /* This table must be empty if there are no module references left. */
759 for (i = 0; i < VLAN_GRP_HASH_SIZE; i++)
760 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
761
762 unregister_pernet_subsys(&vlan_net_ops);
763 rcu_barrier(); /* Wait for completion of call_rcu()'s */
764
765 vlan_gvrp_uninit();
766 }
767
768 module_init(vlan_proto_init);
769 module_exit(vlan_cleanup_module);
770
771 MODULE_LICENSE("GPL");
772 MODULE_VERSION(DRV_VERSION);
Linux kernel - Deliverables
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