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 <asm/uaccess.h> /* for copy_from_user */
22 #include <linux/capability.h>
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 #include <net/net_namespace.h>
35
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) */
45 static struct hlist_head vlan_group_hash[VLAN_GRP_HASH_SIZE];
46
47 static char vlan_fullname[] = "802.1Q VLAN Support";
48 static char vlan_version[] = DRV_VERSION;
49 static char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>";
50 static char vlan_buggyright[] = "David S. Miller <davem@redhat.com>";
51
52 /* Determines interface naming scheme. */
53 unsigned short vlan_name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
54
55 static struct packet_type vlan_packet_type = {
56 .type = __constant_htons(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(int real_dev_ifindex)
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_ifindex == real_dev_ifindex)
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,
87 unsigned short VID)
88 {
89 struct vlan_group *grp = __vlan_find_group(real_dev->ifindex);
90
91 if (grp)
92 return vlan_group_get_device(grp, VID);
93
94 return NULL;
95 }
96
97 static void vlan_group_free(struct vlan_group *grp)
98 {
99 int i;
100
101 for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
102 kfree(grp->vlan_devices_arrays[i]);
103 kfree(grp);
104 }
105
106 static struct vlan_group *vlan_group_alloc(int ifindex)
107 {
108 struct vlan_group *grp;
109 unsigned int size;
110 unsigned int i;
111
112 grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
113 if (!grp)
114 return NULL;
115
116 size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
117
118 for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++) {
119 grp->vlan_devices_arrays[i] = kzalloc(size, GFP_KERNEL);
120 if (!grp->vlan_devices_arrays[i])
121 goto err;
122 }
123
124 grp->real_dev_ifindex = ifindex;
125 hlist_add_head_rcu(&grp->hlist,
126 &vlan_group_hash[vlan_grp_hashfn(ifindex)]);
127 return grp;
128
129 err:
130 vlan_group_free(grp);
131 return NULL;
132 }
133
134 static void vlan_rcu_free(struct rcu_head *rcu)
135 {
136 vlan_group_free(container_of(rcu, struct vlan_group, rcu));
137 }
138
139 void unregister_vlan_dev(struct net_device *dev)
140 {
141 struct vlan_dev_info *vlan = vlan_dev_info(dev);
142 struct net_device *real_dev = vlan->real_dev;
143 struct vlan_group *grp;
144 unsigned short vlan_id = vlan->vlan_id;
145
146 ASSERT_RTNL();
147
148 grp = __vlan_find_group(real_dev->ifindex);
149 BUG_ON(!grp);
150
151 vlan_proc_rem_dev(dev);
152
153 /* Take it out of our own structures, but be sure to interlock with
154 * HW accelerating devices or SW vlan input packet processing.
155 */
156 if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
157 real_dev->vlan_rx_kill_vid(real_dev, vlan_id);
158
159 vlan_group_set_device(grp, vlan_id, NULL);
160 grp->nr_vlans--;
161
162 synchronize_net();
163
164 /* If the group is now empty, kill off the group. */
165 if (grp->nr_vlans == 0) {
166 if (real_dev->features & NETIF_F_HW_VLAN_RX)
167 real_dev->vlan_rx_register(real_dev, NULL);
168
169 hlist_del_rcu(&grp->hlist);
170
171 /* Free the group, after all cpu's are done. */
172 call_rcu(&grp->rcu, vlan_rcu_free);
173 }
174
175 /* Get rid of the vlan's reference to real_dev */
176 dev_put(real_dev);
177
178 unregister_netdevice(dev);
179 }
180
181 static void vlan_transfer_operstate(const struct net_device *dev,
182 struct net_device *vlandev)
183 {
184 /* Have to respect userspace enforced dormant state
185 * of real device, also must allow supplicant running
186 * on VLAN device
187 */
188 if (dev->operstate == IF_OPER_DORMANT)
189 netif_dormant_on(vlandev);
190 else
191 netif_dormant_off(vlandev);
192
193 if (netif_carrier_ok(dev)) {
194 if (!netif_carrier_ok(vlandev))
195 netif_carrier_on(vlandev);
196 } else {
197 if (netif_carrier_ok(vlandev))
198 netif_carrier_off(vlandev);
199 }
200 }
201
202 int vlan_check_real_dev(struct net_device *real_dev, unsigned short vlan_id)
203 {
204 char *name = real_dev->name;
205
206 if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
207 pr_info("8021q: VLANs not supported on %s\n", name);
208 return -EOPNOTSUPP;
209 }
210
211 if ((real_dev->features & NETIF_F_HW_VLAN_RX) &&
212 !real_dev->vlan_rx_register) {
213 pr_info("8021q: device %s has buggy VLAN hw accel\n", name);
214 return -EOPNOTSUPP;
215 }
216
217 if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
218 (!real_dev->vlan_rx_add_vid || !real_dev->vlan_rx_kill_vid)) {
219 pr_info("8021q: Device %s has buggy VLAN hw accel\n", name);
220 return -EOPNOTSUPP;
221 }
222
223 /* The real device must be up and operating in order to
224 * assosciate a VLAN device with it.
225 */
226 if (!(real_dev->flags & IFF_UP))
227 return -ENETDOWN;
228
229 if (__find_vlan_dev(real_dev, vlan_id) != NULL)
230 return -EEXIST;
231
232 return 0;
233 }
234
235 int register_vlan_dev(struct net_device *dev)
236 {
237 struct vlan_dev_info *vlan = vlan_dev_info(dev);
238 struct net_device *real_dev = vlan->real_dev;
239 unsigned short vlan_id = vlan->vlan_id;
240 struct vlan_group *grp, *ngrp = NULL;
241 int err;
242
243 grp = __vlan_find_group(real_dev->ifindex);
244 if (!grp) {
245 ngrp = grp = vlan_group_alloc(real_dev->ifindex);
246 if (!grp)
247 return -ENOBUFS;
248 }
249
250 err = register_netdevice(dev);
251 if (err < 0)
252 goto out_free_group;
253
254 /* Account for reference in struct vlan_dev_info */
255 dev_hold(real_dev);
256
257 vlan_transfer_operstate(real_dev, dev);
258 linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
259
260 /* So, got the sucker initialized, now lets place
261 * it into our local structure.
262 */
263 vlan_group_set_device(grp, vlan_id, dev);
264 grp->nr_vlans++;
265
266 if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX)
267 real_dev->vlan_rx_register(real_dev, ngrp);
268 if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
269 real_dev->vlan_rx_add_vid(real_dev, vlan_id);
270
271 if (vlan_proc_add_dev(dev) < 0)
272 pr_warning("8021q: failed to add proc entry for %s\n",
273 dev->name);
274 return 0;
275
276 out_free_group:
277 if (ngrp)
278 vlan_group_free(ngrp);
279 return err;
280 }
281
282 /* Attach a VLAN device to a mac address (ie Ethernet Card).
283 * Returns 0 if the device was created or a negative error code otherwise.
284 */
285 static int register_vlan_device(struct net_device *real_dev,
286 unsigned short VLAN_ID)
287 {
288 struct net_device *new_dev;
289 char name[IFNAMSIZ];
290 int err;
291
292 if (VLAN_ID >= VLAN_VID_MASK)
293 return -ERANGE;
294
295 err = vlan_check_real_dev(real_dev, VLAN_ID);
296 if (err < 0)
297 return err;
298
299 /* Gotta set up the fields for the device. */
300 switch (vlan_name_type) {
301 case VLAN_NAME_TYPE_RAW_PLUS_VID:
302 /* name will look like: eth1.0005 */
303 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, VLAN_ID);
304 break;
305 case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
306 /* Put our vlan.VID in the name.
307 * Name will look like: vlan5
308 */
309 snprintf(name, IFNAMSIZ, "vlan%i", VLAN_ID);
310 break;
311 case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
312 /* Put our vlan.VID in the name.
313 * Name will look like: eth0.5
314 */
315 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, VLAN_ID);
316 break;
317 case VLAN_NAME_TYPE_PLUS_VID:
318 /* Put our vlan.VID in the name.
319 * Name will look like: vlan0005
320 */
321 default:
322 snprintf(name, IFNAMSIZ, "vlan%.4i", VLAN_ID);
323 }
324
325 new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
326 vlan_setup);
327
328 if (new_dev == NULL)
329 return -ENOBUFS;
330
331 /* need 4 bytes for extra VLAN header info,
332 * hope the underlying device can handle it.
333 */
334 new_dev->mtu = real_dev->mtu;
335
336 vlan_dev_info(new_dev)->vlan_id = VLAN_ID; /* 1 through VLAN_VID_MASK */
337 vlan_dev_info(new_dev)->real_dev = real_dev;
338 vlan_dev_info(new_dev)->dent = NULL;
339 vlan_dev_info(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
340
341 new_dev->rtnl_link_ops = &vlan_link_ops;
342 err = register_vlan_dev(new_dev);
343 if (err < 0)
344 goto out_free_newdev;
345
346 return 0;
347
348 out_free_newdev:
349 free_netdev(new_dev);
350 return err;
351 }
352
353 static void vlan_sync_address(struct net_device *dev,
354 struct net_device *vlandev)
355 {
356 struct vlan_dev_info *vlan = vlan_dev_info(vlandev);
357
358 /* May be called without an actual change */
359 if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
360 return;
361
362 /* vlan address was different from the old address and is equal to
363 * the new address */
364 if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
365 !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
366 dev_unicast_delete(dev, vlandev->dev_addr, ETH_ALEN);
367
368 /* vlan address was equal to the old address and is different from
369 * the new address */
370 if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
371 compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
372 dev_unicast_add(dev, vlandev->dev_addr, ETH_ALEN);
373
374 memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
375 }
376
377 static void __vlan_device_event(struct net_device *dev, unsigned long event)
378 {
379 switch (event) {
380 case NETDEV_CHANGENAME:
381 vlan_proc_rem_dev(dev);
382 if (vlan_proc_add_dev(dev) < 0)
383 pr_warning("8021q: failed to change proc name for %s\n",
384 dev->name);
385 break;
386 }
387 }
388
389 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
390 void *ptr)
391 {
392 struct net_device *dev = ptr;
393 struct vlan_group *grp;
394 int i, flgs;
395 struct net_device *vlandev;
396
397 if (dev->nd_net != &init_net)
398 return NOTIFY_DONE;
399
400 if (is_vlan_dev(dev))
401 __vlan_device_event(dev, event);
402
403 grp = __vlan_find_group(dev->ifindex);
404 if (!grp)
405 goto out;
406
407 /* It is OK that we do not hold the group lock right now,
408 * as we run under the RTNL lock.
409 */
410
411 switch (event) {
412 case NETDEV_CHANGE:
413 /* Propagate real device state to vlan devices */
414 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
415 vlandev = vlan_group_get_device(grp, i);
416 if (!vlandev)
417 continue;
418
419 vlan_transfer_operstate(dev, vlandev);
420 }
421 break;
422
423 case NETDEV_CHANGEADDR:
424 /* Adjust unicast filters on underlying device */
425 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
426 vlandev = vlan_group_get_device(grp, i);
427 if (!vlandev)
428 continue;
429
430 flgs = vlandev->flags;
431 if (!(flgs & IFF_UP))
432 continue;
433
434 vlan_sync_address(dev, vlandev);
435 }
436 break;
437
438 case NETDEV_DOWN:
439 /* Put all VLANs for this dev in the down state too. */
440 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
441 vlandev = vlan_group_get_device(grp, i);
442 if (!vlandev)
443 continue;
444
445 flgs = vlandev->flags;
446 if (!(flgs & IFF_UP))
447 continue;
448
449 dev_change_flags(vlandev, flgs & ~IFF_UP);
450 }
451 break;
452
453 case NETDEV_UP:
454 /* Put all VLANs for this dev in the up state too. */
455 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
456 vlandev = vlan_group_get_device(grp, i);
457 if (!vlandev)
458 continue;
459
460 flgs = vlandev->flags;
461 if (flgs & IFF_UP)
462 continue;
463
464 dev_change_flags(vlandev, flgs | IFF_UP);
465 }
466 break;
467
468 case NETDEV_UNREGISTER:
469 /* Delete all VLANs for this dev. */
470 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
471 vlandev = vlan_group_get_device(grp, i);
472 if (!vlandev)
473 continue;
474
475 /* unregistration of last vlan destroys group, abort
476 * afterwards */
477 if (grp->nr_vlans == 1)
478 i = VLAN_GROUP_ARRAY_LEN;
479
480 unregister_vlan_dev(vlandev);
481 }
482 break;
483 }
484
485 out:
486 return NOTIFY_DONE;
487 }
488
489 static struct notifier_block vlan_notifier_block __read_mostly = {
490 .notifier_call = vlan_device_event,
491 };
492
493 /*
494 * VLAN IOCTL handler.
495 * o execute requested action or pass command to the device driver
496 * arg is really a struct vlan_ioctl_args __user *.
497 */
498 static int vlan_ioctl_handler(struct net *net, void __user *arg)
499 {
500 int err;
501 unsigned short vid = 0;
502 struct vlan_ioctl_args args;
503 struct net_device *dev = NULL;
504
505 if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
506 return -EFAULT;
507
508 /* Null terminate this sucker, just in case. */
509 args.device1[23] = 0;
510 args.u.device2[23] = 0;
511
512 rtnl_lock();
513
514 switch (args.cmd) {
515 case SET_VLAN_INGRESS_PRIORITY_CMD:
516 case SET_VLAN_EGRESS_PRIORITY_CMD:
517 case SET_VLAN_FLAG_CMD:
518 case ADD_VLAN_CMD:
519 case DEL_VLAN_CMD:
520 case GET_VLAN_REALDEV_NAME_CMD:
521 case GET_VLAN_VID_CMD:
522 err = -ENODEV;
523 dev = __dev_get_by_name(&init_net, args.device1);
524 if (!dev)
525 goto out;
526
527 err = -EINVAL;
528 if (args.cmd != ADD_VLAN_CMD &&
529 !(dev->priv_flags & IFF_802_1Q_VLAN))
530 goto out;
531 }
532
533 switch (args.cmd) {
534 case SET_VLAN_INGRESS_PRIORITY_CMD:
535 err = -EPERM;
536 if (!capable(CAP_NET_ADMIN))
537 break;
538 vlan_dev_set_ingress_priority(dev,
539 args.u.skb_priority,
540 args.vlan_qos);
541 err = 0;
542 break;
543
544 case SET_VLAN_EGRESS_PRIORITY_CMD:
545 err = -EPERM;
546 if (!capable(CAP_NET_ADMIN))
547 break;
548 err = vlan_dev_set_egress_priority(dev,
549 args.u.skb_priority,
550 args.vlan_qos);
551 break;
552
553 case SET_VLAN_FLAG_CMD:
554 err = -EPERM;
555 if (!capable(CAP_NET_ADMIN))
556 break;
557 err = vlan_dev_set_vlan_flag(dev,
558 args.u.flag,
559 args.vlan_qos);
560 break;
561
562 case SET_VLAN_NAME_TYPE_CMD:
563 err = -EPERM;
564 if (!capable(CAP_NET_ADMIN))
565 break;
566 if ((args.u.name_type >= 0) &&
567 (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
568 vlan_name_type = args.u.name_type;
569 err = 0;
570 } else {
571 err = -EINVAL;
572 }
573 break;
574
575 case ADD_VLAN_CMD:
576 err = -EPERM;
577 if (!capable(CAP_NET_ADMIN))
578 break;
579 err = register_vlan_device(dev, args.u.VID);
580 break;
581
582 case DEL_VLAN_CMD:
583 err = -EPERM;
584 if (!capable(CAP_NET_ADMIN))
585 break;
586 unregister_vlan_dev(dev);
587 err = 0;
588 break;
589
590 case GET_VLAN_REALDEV_NAME_CMD:
591 err = 0;
592 vlan_dev_get_realdev_name(dev, args.u.device2);
593 if (copy_to_user(arg, &args,
594 sizeof(struct vlan_ioctl_args)))
595 err = -EFAULT;
596 break;
597
598 case GET_VLAN_VID_CMD:
599 err = 0;
600 vlan_dev_get_vid(dev, &vid);
601 args.u.VID = vid;
602 if (copy_to_user(arg, &args,
603 sizeof(struct vlan_ioctl_args)))
604 err = -EFAULT;
605 break;
606
607 default:
608 err = -EOPNOTSUPP;
609 break;
610 }
611 out:
612 rtnl_unlock();
613 return err;
614 }
615
616 static int __init vlan_proto_init(void)
617 {
618 int err;
619
620 pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright);
621 pr_info("All bugs added by %s\n", vlan_buggyright);
622
623 err = vlan_proc_init();
624 if (err < 0)
625 goto err1;
626
627 err = register_netdevice_notifier(&vlan_notifier_block);
628 if (err < 0)
629 goto err2;
630
631 err = vlan_netlink_init();
632 if (err < 0)
633 goto err3;
634
635 dev_add_pack(&vlan_packet_type);
636 vlan_ioctl_set(vlan_ioctl_handler);
637 return 0;
638
639 err3:
640 unregister_netdevice_notifier(&vlan_notifier_block);
641 err2:
642 vlan_proc_cleanup();
643 err1:
644 return err;
645 }
646
647 static void __exit vlan_cleanup_module(void)
648 {
649 unsigned int i;
650
651 vlan_ioctl_set(NULL);
652 vlan_netlink_fini();
653
654 unregister_netdevice_notifier(&vlan_notifier_block);
655
656 dev_remove_pack(&vlan_packet_type);
657
658 /* This table must be empty if there are no module references left. */
659 for (i = 0; i < VLAN_GRP_HASH_SIZE; i++)
660 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
661
662 vlan_proc_cleanup();
663
664 synchronize_net();
665 }
666
667 module_init(vlan_proto_init);
668 module_exit(vlan_cleanup_module);
669
670 MODULE_LICENSE("GPL");
671 MODULE_VERSION(DRV_VERSION);
672
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