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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
22
23 #include <linux/capability.h>
24 #include <linux/module.h>
25 #include <linux/netdevice.h>
26 #include <linux/skbuff.h>
27 #include <linux/slab.h>
28 #include <linux/init.h>
29 #include <linux/rculist.h>
30 #include <net/p8022.h>
31 #include <net/arp.h>
32 #include <linux/rtnetlink.h>
33 #include <linux/notifier.h>
34 #include <net/rtnetlink.h>
35 #include <net/net_namespace.h>
36 #include <net/netns/generic.h>
37 #include <asm/uaccess.h>
38
39 #include <linux/if_vlan.h>
40 #include "vlan.h"
41 #include "vlanproc.h"
42
43 #define DRV_VERSION "1.8"
44
45 /* Global VLAN variables */
46
47 int vlan_net_id __read_mostly;
48
49 const char vlan_fullname[] = "802.1Q VLAN Support";
50 const char vlan_version[] = DRV_VERSION;
51
52 /* End of global variables definitions. */
53
vlan_group_prealloc_vid(struct vlan_group * vg,u16 vlan_id)54 static int vlan_group_prealloc_vid(struct vlan_group *vg, u16 vlan_id)
55 {
56 struct net_device **array;
57 unsigned int size;
58
59 ASSERT_RTNL();
60
61 array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
62 if (array != NULL)
63 return 0;
64
65 size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
66 array = kzalloc(size, GFP_KERNEL);
67 if (array == NULL)
68 return -ENOBUFS;
69
70 vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN] = array;
71 return 0;
72 }
73
unregister_vlan_dev(struct net_device * dev,struct list_head * head)74 void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
75 {
76 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
77 struct net_device *real_dev = vlan->real_dev;
78 struct vlan_info *vlan_info;
79 struct vlan_group *grp;
80 u16 vlan_id = vlan->vlan_id;
81
82 ASSERT_RTNL();
83
84 vlan_info = rtnl_dereference(real_dev->vlan_info);
85 BUG_ON(!vlan_info);
86
87 grp = &vlan_info->grp;
88
89 grp->nr_vlan_devs--;
90
91 if (vlan->flags & VLAN_FLAG_GVRP)
92 vlan_gvrp_request_leave(dev);
93
94 vlan_group_set_device(grp, vlan_id, NULL);
95 /* Because unregister_netdevice_queue() makes sure at least one rcu
96 * grace period is respected before device freeing,
97 * we dont need to call synchronize_net() here.
98 */
99 unregister_netdevice_queue(dev, head);
100
101 if (grp->nr_vlan_devs == 0)
102 vlan_gvrp_uninit_applicant(real_dev);
103
104 /* Take it out of our own structures, but be sure to interlock with
105 * HW accelerating devices or SW vlan input packet processing if
106 * VLAN is not 0 (leave it there for 802.1p).
107 */
108 if (vlan_id)
109 vlan_vid_del(real_dev, vlan_id);
110
111 /* Get rid of the vlan's reference to real_dev */
112 dev_put(real_dev);
113 }
114
vlan_check_real_dev(struct net_device * real_dev,u16 vlan_id)115 int vlan_check_real_dev(struct net_device *real_dev, u16 vlan_id)
116 {
117 const char *name = real_dev->name;
118 const struct net_device_ops *ops = real_dev->netdev_ops;
119
120 if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
121 pr_info("VLANs not supported on %s\n", name);
122 return -EOPNOTSUPP;
123 }
124
125 if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
126 (!ops->ndo_vlan_rx_add_vid || !ops->ndo_vlan_rx_kill_vid)) {
127 pr_info("Device %s has buggy VLAN hw accel\n", name);
128 return -EOPNOTSUPP;
129 }
130
131 if (vlan_find_dev(real_dev, vlan_id) != NULL)
132 return -EEXIST;
133
134 return 0;
135 }
136
register_vlan_dev(struct net_device * dev)137 int register_vlan_dev(struct net_device *dev)
138 {
139 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
140 struct net_device *real_dev = vlan->real_dev;
141 u16 vlan_id = vlan->vlan_id;
142 struct vlan_info *vlan_info;
143 struct vlan_group *grp;
144 int err;
145
146 err = vlan_vid_add(real_dev, vlan_id);
147 if (err)
148 return err;
149
150 vlan_info = rtnl_dereference(real_dev->vlan_info);
151 /* vlan_info should be there now. vlan_vid_add took care of it */
152 BUG_ON(!vlan_info);
153
154 grp = &vlan_info->grp;
155 if (grp->nr_vlan_devs == 0) {
156 err = vlan_gvrp_init_applicant(real_dev);
157 if (err < 0)
158 goto out_vid_del;
159 }
160
161 err = vlan_group_prealloc_vid(grp, vlan_id);
162 if (err < 0)
163 goto out_uninit_applicant;
164
165 err = register_netdevice(dev);
166 if (err < 0)
167 goto out_uninit_applicant;
168
169 /* Account for reference in struct vlan_dev_priv */
170 dev_hold(real_dev);
171
172 netif_stacked_transfer_operstate(real_dev, dev);
173 linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
174
175 /* So, got the sucker initialized, now lets place
176 * it into our local structure.
177 */
178 vlan_group_set_device(grp, vlan_id, dev);
179 grp->nr_vlan_devs++;
180
181 return 0;
182
183 out_uninit_applicant:
184 if (grp->nr_vlan_devs == 0)
185 vlan_gvrp_uninit_applicant(real_dev);
186 out_vid_del:
187 vlan_vid_del(real_dev, vlan_id);
188 return err;
189 }
190
191 /* Attach a VLAN device to a mac address (ie Ethernet Card).
192 * Returns 0 if the device was created or a negative error code otherwise.
193 */
register_vlan_device(struct net_device * real_dev,u16 vlan_id)194 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
195 {
196 struct net_device *new_dev;
197 struct net *net = dev_net(real_dev);
198 struct vlan_net *vn = net_generic(net, vlan_net_id);
199 char name[IFNAMSIZ];
200 int err;
201
202 if (vlan_id >= VLAN_VID_MASK)
203 return -ERANGE;
204
205 err = vlan_check_real_dev(real_dev, vlan_id);
206 if (err < 0)
207 return err;
208
209 /* Gotta set up the fields for the device. */
210 switch (vn->name_type) {
211 case VLAN_NAME_TYPE_RAW_PLUS_VID:
212 /* name will look like: eth1.0005 */
213 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
214 break;
215 case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
216 /* Put our vlan.VID in the name.
217 * Name will look like: vlan5
218 */
219 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
220 break;
221 case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
222 /* Put our vlan.VID in the name.
223 * Name will look like: eth0.5
224 */
225 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
226 break;
227 case VLAN_NAME_TYPE_PLUS_VID:
228 /* Put our vlan.VID in the name.
229 * Name will look like: vlan0005
230 */
231 default:
232 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
233 }
234
235 new_dev = alloc_netdev(sizeof(struct vlan_dev_priv), name, vlan_setup);
236
237 if (new_dev == NULL)
238 return -ENOBUFS;
239
240 dev_net_set(new_dev, net);
241 /* need 4 bytes for extra VLAN header info,
242 * hope the underlying device can handle it.
243 */
244 new_dev->mtu = real_dev->mtu;
245
246 vlan_dev_priv(new_dev)->vlan_id = vlan_id;
247 vlan_dev_priv(new_dev)->real_dev = real_dev;
248 vlan_dev_priv(new_dev)->dent = NULL;
249 vlan_dev_priv(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
250
251 new_dev->rtnl_link_ops = &vlan_link_ops;
252 err = register_vlan_dev(new_dev);
253 if (err < 0)
254 goto out_free_newdev;
255
256 return 0;
257
258 out_free_newdev:
259 free_netdev(new_dev);
260 return err;
261 }
262
vlan_sync_address(struct net_device * dev,struct net_device * vlandev)263 static void vlan_sync_address(struct net_device *dev,
264 struct net_device *vlandev)
265 {
266 struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
267
268 /* May be called without an actual change */
269 if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
270 return;
271
272 /* vlan address was different from the old address and is equal to
273 * the new address */
274 if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
275 !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
276 dev_uc_del(dev, vlandev->dev_addr);
277
278 /* vlan address was equal to the old address and is different from
279 * the new address */
280 if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
281 compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
282 dev_uc_add(dev, vlandev->dev_addr);
283
284 memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
285 }
286
vlan_transfer_features(struct net_device * dev,struct net_device * vlandev)287 static void vlan_transfer_features(struct net_device *dev,
288 struct net_device *vlandev)
289 {
290 vlandev->gso_max_size = dev->gso_max_size;
291
292 if (dev->features & NETIF_F_HW_VLAN_TX)
293 vlandev->hard_header_len = dev->hard_header_len;
294 else
295 vlandev->hard_header_len = dev->hard_header_len + VLAN_HLEN;
296
297 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
298 vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
299 #endif
300
301 netdev_update_features(vlandev);
302 }
303
__vlan_device_event(struct net_device * dev,unsigned long event)304 static void __vlan_device_event(struct net_device *dev, unsigned long event)
305 {
306 switch (event) {
307 case NETDEV_CHANGENAME:
308 vlan_proc_rem_dev(dev);
309 if (vlan_proc_add_dev(dev) < 0)
310 pr_warn("failed to change proc name for %s\n",
311 dev->name);
312 break;
313 case NETDEV_REGISTER:
314 if (vlan_proc_add_dev(dev) < 0)
315 pr_warn("failed to add proc entry for %s\n", dev->name);
316 break;
317 case NETDEV_UNREGISTER:
318 vlan_proc_rem_dev(dev);
319 break;
320 }
321 }
322
vlan_device_event(struct notifier_block * unused,unsigned long event,void * ptr)323 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
324 void *ptr)
325 {
326 struct net_device *dev = ptr;
327 struct vlan_group *grp;
328 struct vlan_info *vlan_info;
329 int i, flgs;
330 struct net_device *vlandev;
331 struct vlan_dev_priv *vlan;
332 LIST_HEAD(list);
333
334 if (is_vlan_dev(dev))
335 __vlan_device_event(dev, event);
336
337 if ((event == NETDEV_UP) &&
338 (dev->features & NETIF_F_HW_VLAN_FILTER)) {
339 pr_info("adding VLAN 0 to HW filter on device %s\n",
340 dev->name);
341 vlan_vid_add(dev, 0);
342 }
343
344 vlan_info = rtnl_dereference(dev->vlan_info);
345 if (!vlan_info)
346 goto out;
347 grp = &vlan_info->grp;
348
349 /* It is OK that we do not hold the group lock right now,
350 * as we run under the RTNL lock.
351 */
352
353 switch (event) {
354 case NETDEV_CHANGE:
355 /* Propagate real device state to vlan devices */
356 for (i = 0; i < VLAN_N_VID; i++) {
357 vlandev = vlan_group_get_device(grp, i);
358 if (!vlandev)
359 continue;
360
361 netif_stacked_transfer_operstate(dev, vlandev);
362 }
363 break;
364
365 case NETDEV_CHANGEADDR:
366 /* Adjust unicast filters on underlying device */
367 for (i = 0; i < VLAN_N_VID; i++) {
368 vlandev = vlan_group_get_device(grp, i);
369 if (!vlandev)
370 continue;
371
372 flgs = vlandev->flags;
373 if (!(flgs & IFF_UP))
374 continue;
375
376 vlan_sync_address(dev, vlandev);
377 }
378 break;
379
380 case NETDEV_CHANGEMTU:
381 for (i = 0; i < VLAN_N_VID; i++) {
382 vlandev = vlan_group_get_device(grp, i);
383 if (!vlandev)
384 continue;
385
386 if (vlandev->mtu <= dev->mtu)
387 continue;
388
389 dev_set_mtu(vlandev, dev->mtu);
390 }
391 break;
392
393 case NETDEV_FEAT_CHANGE:
394 /* Propagate device features to underlying device */
395 for (i = 0; i < VLAN_N_VID; i++) {
396 vlandev = vlan_group_get_device(grp, i);
397 if (!vlandev)
398 continue;
399
400 vlan_transfer_features(dev, vlandev);
401 }
402
403 break;
404
405 case NETDEV_DOWN:
406 if (dev->features & NETIF_F_HW_VLAN_FILTER)
407 vlan_vid_del(dev, 0);
408
409 /* Put all VLANs for this dev in the down state too. */
410 for (i = 0; i < VLAN_N_VID; i++) {
411 vlandev = vlan_group_get_device(grp, i);
412 if (!vlandev)
413 continue;
414
415 flgs = vlandev->flags;
416 if (!(flgs & IFF_UP))
417 continue;
418
419 vlan = vlan_dev_priv(vlandev);
420 if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
421 dev_change_flags(vlandev, flgs & ~IFF_UP);
422 netif_stacked_transfer_operstate(dev, vlandev);
423 }
424 break;
425
426 case NETDEV_UP:
427 /* Put all VLANs for this dev in the up state too. */
428 for (i = 0; i < VLAN_N_VID; i++) {
429 vlandev = vlan_group_get_device(grp, i);
430 if (!vlandev)
431 continue;
432
433 flgs = vlandev->flags;
434 if (flgs & IFF_UP)
435 continue;
436
437 vlan = vlan_dev_priv(vlandev);
438 if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
439 dev_change_flags(vlandev, flgs | IFF_UP);
440 netif_stacked_transfer_operstate(dev, vlandev);
441 }
442 break;
443
444 case NETDEV_UNREGISTER:
445 /* twiddle thumbs on netns device moves */
446 if (dev->reg_state != NETREG_UNREGISTERING)
447 break;
448
449 for (i = 0; i < VLAN_N_VID; i++) {
450 vlandev = vlan_group_get_device(grp, i);
451 if (!vlandev)
452 continue;
453
454 /* removal of last vid destroys vlan_info, abort
455 * afterwards */
456 if (vlan_info->nr_vids == 1)
457 i = VLAN_N_VID;
458
459 unregister_vlan_dev(vlandev, &list);
460 }
461 unregister_netdevice_many(&list);
462 break;
463
464 case NETDEV_PRE_TYPE_CHANGE:
465 /* Forbid underlaying device to change its type. */
466 return NOTIFY_BAD;
467
468 case NETDEV_NOTIFY_PEERS:
469 case NETDEV_BONDING_FAILOVER:
470 /* Propagate to vlan devices */
471 for (i = 0; i < VLAN_N_VID; i++) {
472 vlandev = vlan_group_get_device(grp, i);
473 if (!vlandev)
474 continue;
475
476 call_netdevice_notifiers(event, vlandev);
477 }
478 break;
479 }
480
481 out:
482 return NOTIFY_DONE;
483 }
484
485 static struct notifier_block vlan_notifier_block __read_mostly = {
486 .notifier_call = vlan_device_event,
487 };
488
489 /*
490 * VLAN IOCTL handler.
491 * o execute requested action or pass command to the device driver
492 * arg is really a struct vlan_ioctl_args __user *.
493 */
vlan_ioctl_handler(struct net * net,void __user * arg)494 static int vlan_ioctl_handler(struct net *net, void __user *arg)
495 {
496 int err;
497 struct vlan_ioctl_args args;
498 struct net_device *dev = NULL;
499
500 if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
501 return -EFAULT;
502
503 /* Null terminate this sucker, just in case. */
504 args.device1[23] = 0;
505 args.u.device2[23] = 0;
506
507 rtnl_lock();
508
509 switch (args.cmd) {
510 case SET_VLAN_INGRESS_PRIORITY_CMD:
511 case SET_VLAN_EGRESS_PRIORITY_CMD:
512 case SET_VLAN_FLAG_CMD:
513 case ADD_VLAN_CMD:
514 case DEL_VLAN_CMD:
515 case GET_VLAN_REALDEV_NAME_CMD:
516 case GET_VLAN_VID_CMD:
517 err = -ENODEV;
518 dev = __dev_get_by_name(net, args.device1);
519 if (!dev)
520 goto out;
521
522 err = -EINVAL;
523 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
524 goto out;
525 }
526
527 switch (args.cmd) {
528 case SET_VLAN_INGRESS_PRIORITY_CMD:
529 err = -EPERM;
530 if (!capable(CAP_NET_ADMIN))
531 break;
532 vlan_dev_set_ingress_priority(dev,
533 args.u.skb_priority,
534 args.vlan_qos);
535 err = 0;
536 break;
537
538 case SET_VLAN_EGRESS_PRIORITY_CMD:
539 err = -EPERM;
540 if (!capable(CAP_NET_ADMIN))
541 break;
542 err = vlan_dev_set_egress_priority(dev,
543 args.u.skb_priority,
544 args.vlan_qos);
545 break;
546
547 case SET_VLAN_FLAG_CMD:
548 err = -EPERM;
549 if (!capable(CAP_NET_ADMIN))
550 break;
551 err = vlan_dev_change_flags(dev,
552 args.vlan_qos ? args.u.flag : 0,
553 args.u.flag);
554 break;
555
556 case SET_VLAN_NAME_TYPE_CMD:
557 err = -EPERM;
558 if (!capable(CAP_NET_ADMIN))
559 break;
560 if ((args.u.name_type >= 0) &&
561 (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
562 struct vlan_net *vn;
563
564 vn = net_generic(net, vlan_net_id);
565 vn->name_type = args.u.name_type;
566 err = 0;
567 } else {
568 err = -EINVAL;
569 }
570 break;
571
572 case ADD_VLAN_CMD:
573 err = -EPERM;
574 if (!capable(CAP_NET_ADMIN))
575 break;
576 err = register_vlan_device(dev, args.u.VID);
577 break;
578
579 case DEL_VLAN_CMD:
580 err = -EPERM;
581 if (!capable(CAP_NET_ADMIN))
582 break;
583 unregister_vlan_dev(dev, NULL);
584 err = 0;
585 break;
586
587 case GET_VLAN_REALDEV_NAME_CMD:
588 err = 0;
589 vlan_dev_get_realdev_name(dev, args.u.device2);
590 if (copy_to_user(arg, &args,
591 sizeof(struct vlan_ioctl_args)))
592 err = -EFAULT;
593 break;
594
595 case GET_VLAN_VID_CMD:
596 err = 0;
597 args.u.VID = vlan_dev_vlan_id(dev);
598 if (copy_to_user(arg, &args,
599 sizeof(struct vlan_ioctl_args)))
600 err = -EFAULT;
601 break;
602
603 default:
604 err = -EOPNOTSUPP;
605 break;
606 }
607 out:
608 rtnl_unlock();
609 return err;
610 }
611
vlan_init_net(struct net * net)612 static int __net_init vlan_init_net(struct net *net)
613 {
614 struct vlan_net *vn = net_generic(net, vlan_net_id);
615 int err;
616
617 vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
618
619 err = vlan_proc_init(net);
620
621 return err;
622 }
623
vlan_exit_net(struct net * net)624 static void __net_exit vlan_exit_net(struct net *net)
625 {
626 vlan_proc_cleanup(net);
627 }
628
629 static struct pernet_operations vlan_net_ops = {
630 .init = vlan_init_net,
631 .exit = vlan_exit_net,
632 .id = &vlan_net_id,
633 .size = sizeof(struct vlan_net),
634 };
635
vlan_proto_init(void)636 static int __init vlan_proto_init(void)
637 {
638 int err;
639
640 pr_info("%s v%s\n", vlan_fullname, vlan_version);
641
642 err = register_pernet_subsys(&vlan_net_ops);
643 if (err < 0)
644 goto err0;
645
646 err = register_netdevice_notifier(&vlan_notifier_block);
647 if (err < 0)
648 goto err2;
649
650 err = vlan_gvrp_init();
651 if (err < 0)
652 goto err3;
653
654 err = vlan_netlink_init();
655 if (err < 0)
656 goto err4;
657
658 vlan_ioctl_set(vlan_ioctl_handler);
659 return 0;
660
661 err4:
662 vlan_gvrp_uninit();
663 err3:
664 unregister_netdevice_notifier(&vlan_notifier_block);
665 err2:
666 unregister_pernet_subsys(&vlan_net_ops);
667 err0:
668 return err;
669 }
670
vlan_cleanup_module(void)671 static void __exit vlan_cleanup_module(void)
672 {
673 vlan_ioctl_set(NULL);
674 vlan_netlink_fini();
675
676 unregister_netdevice_notifier(&vlan_notifier_block);
677
678 unregister_pernet_subsys(&vlan_net_ops);
679 rcu_barrier(); /* Wait for completion of call_rcu()'s */
680
681 vlan_gvrp_uninit();
682 }
683
684 module_init(vlan_proto_init);
685 module_exit(vlan_cleanup_module);
686
687 MODULE_LICENSE("GPL");
688 MODULE_VERSION(DRV_VERSION);
689