This source file includes following definitions.
- vlan_group_prealloc_vid
- vlan_stacked_transfer_operstate
- unregister_vlan_dev
- vlan_check_real_dev
- register_vlan_dev
- register_vlan_device
- vlan_sync_address
- vlan_transfer_features
- __vlan_device_event
- vlan_device_event
- vlan_ioctl_handler
- vlan_init_net
- vlan_exit_net
- vlan_proto_init
- vlan_cleanup_module
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
18
19 #include <linux/capability.h>
20 #include <linux/module.h>
21 #include <linux/netdevice.h>
22 #include <linux/skbuff.h>
23 #include <linux/slab.h>
24 #include <linux/init.h>
25 #include <linux/rculist.h>
26 #include <net/p8022.h>
27 #include <net/arp.h>
28 #include <linux/rtnetlink.h>
29 #include <linux/notifier.h>
30 #include <net/rtnetlink.h>
31 #include <net/net_namespace.h>
32 #include <net/netns/generic.h>
33 #include <linux/uaccess.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
42
43 unsigned int vlan_net_id __read_mostly;
44
45 const char vlan_fullname[] = "802.1Q VLAN Support";
46 const char vlan_version[] = DRV_VERSION;
47
48
49
50 static int vlan_group_prealloc_vid(struct vlan_group *vg,
51 __be16 vlan_proto, u16 vlan_id)
52 {
53 struct net_device **array;
54 unsigned int pidx, vidx;
55 unsigned int size;
56
57 ASSERT_RTNL();
58
59 pidx = vlan_proto_idx(vlan_proto);
60 vidx = vlan_id / VLAN_GROUP_ARRAY_PART_LEN;
61 array = vg->vlan_devices_arrays[pidx][vidx];
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[pidx][vidx] = array;
71 return 0;
72 }
73
74 static void vlan_stacked_transfer_operstate(const struct net_device *rootdev,
75 struct net_device *dev,
76 struct vlan_dev_priv *vlan)
77 {
78 if (!(vlan->flags & VLAN_FLAG_BRIDGE_BINDING))
79 netif_stacked_transfer_operstate(rootdev, dev);
80 }
81
82 void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
83 {
84 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
85 struct net_device *real_dev = vlan->real_dev;
86 struct vlan_info *vlan_info;
87 struct vlan_group *grp;
88 u16 vlan_id = vlan->vlan_id;
89
90 ASSERT_RTNL();
91
92 vlan_info = rtnl_dereference(real_dev->vlan_info);
93 BUG_ON(!vlan_info);
94
95 grp = &vlan_info->grp;
96
97 grp->nr_vlan_devs--;
98
99 if (vlan->flags & VLAN_FLAG_MVRP)
100 vlan_mvrp_request_leave(dev);
101 if (vlan->flags & VLAN_FLAG_GVRP)
102 vlan_gvrp_request_leave(dev);
103
104 vlan_group_set_device(grp, vlan->vlan_proto, vlan_id, NULL);
105
106 netdev_upper_dev_unlink(real_dev, dev);
107
108
109
110
111 unregister_netdevice_queue(dev, head);
112
113 if (grp->nr_vlan_devs == 0) {
114 vlan_mvrp_uninit_applicant(real_dev);
115 vlan_gvrp_uninit_applicant(real_dev);
116 }
117
118 vlan_vid_del(real_dev, vlan->vlan_proto, vlan_id);
119
120
121 dev_put(real_dev);
122 }
123
124 int vlan_check_real_dev(struct net_device *real_dev,
125 __be16 protocol, u16 vlan_id,
126 struct netlink_ext_ack *extack)
127 {
128 const char *name = real_dev->name;
129
130 if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
131 pr_info("VLANs not supported on %s\n", name);
132 NL_SET_ERR_MSG_MOD(extack, "VLANs not supported on device");
133 return -EOPNOTSUPP;
134 }
135
136 if (vlan_find_dev(real_dev, protocol, vlan_id) != NULL) {
137 NL_SET_ERR_MSG_MOD(extack, "VLAN device already exists");
138 return -EEXIST;
139 }
140
141 return 0;
142 }
143
144 int register_vlan_dev(struct net_device *dev, struct netlink_ext_ack *extack)
145 {
146 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
147 struct net_device *real_dev = vlan->real_dev;
148 u16 vlan_id = vlan->vlan_id;
149 struct vlan_info *vlan_info;
150 struct vlan_group *grp;
151 int err;
152
153 err = vlan_vid_add(real_dev, vlan->vlan_proto, vlan_id);
154 if (err)
155 return err;
156
157 vlan_info = rtnl_dereference(real_dev->vlan_info);
158
159 BUG_ON(!vlan_info);
160
161 grp = &vlan_info->grp;
162 if (grp->nr_vlan_devs == 0) {
163 err = vlan_gvrp_init_applicant(real_dev);
164 if (err < 0)
165 goto out_vid_del;
166 err = vlan_mvrp_init_applicant(real_dev);
167 if (err < 0)
168 goto out_uninit_gvrp;
169 }
170
171 err = vlan_group_prealloc_vid(grp, vlan->vlan_proto, vlan_id);
172 if (err < 0)
173 goto out_uninit_mvrp;
174
175 err = register_netdevice(dev);
176 if (err < 0)
177 goto out_uninit_mvrp;
178
179 err = netdev_upper_dev_link(real_dev, dev, extack);
180 if (err)
181 goto out_unregister_netdev;
182
183
184 dev_hold(real_dev);
185
186 vlan_stacked_transfer_operstate(real_dev, dev, vlan);
187 linkwatch_fire_event(dev);
188
189
190
191
192 vlan_group_set_device(grp, vlan->vlan_proto, vlan_id, dev);
193 grp->nr_vlan_devs++;
194
195 return 0;
196
197 out_unregister_netdev:
198 unregister_netdevice(dev);
199 out_uninit_mvrp:
200 if (grp->nr_vlan_devs == 0)
201 vlan_mvrp_uninit_applicant(real_dev);
202 out_uninit_gvrp:
203 if (grp->nr_vlan_devs == 0)
204 vlan_gvrp_uninit_applicant(real_dev);
205 out_vid_del:
206 vlan_vid_del(real_dev, vlan->vlan_proto, vlan_id);
207 return err;
208 }
209
210
211
212
213 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
214 {
215 struct net_device *new_dev;
216 struct vlan_dev_priv *vlan;
217 struct net *net = dev_net(real_dev);
218 struct vlan_net *vn = net_generic(net, vlan_net_id);
219 char name[IFNAMSIZ];
220 int err;
221
222 if (vlan_id >= VLAN_VID_MASK)
223 return -ERANGE;
224
225 err = vlan_check_real_dev(real_dev, htons(ETH_P_8021Q), vlan_id,
226 NULL);
227 if (err < 0)
228 return err;
229
230
231 switch (vn->name_type) {
232 case VLAN_NAME_TYPE_RAW_PLUS_VID:
233
234 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
235 break;
236 case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
237
238
239
240 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
241 break;
242 case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
243
244
245
246 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
247 break;
248 case VLAN_NAME_TYPE_PLUS_VID:
249
250
251
252 default:
253 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
254 }
255
256 new_dev = alloc_netdev(sizeof(struct vlan_dev_priv), name,
257 NET_NAME_UNKNOWN, vlan_setup);
258
259 if (new_dev == NULL)
260 return -ENOBUFS;
261
262 dev_net_set(new_dev, net);
263
264
265
266 new_dev->mtu = real_dev->mtu;
267
268 vlan = vlan_dev_priv(new_dev);
269 vlan->vlan_proto = htons(ETH_P_8021Q);
270 vlan->vlan_id = vlan_id;
271 vlan->real_dev = real_dev;
272 vlan->dent = NULL;
273 vlan->flags = VLAN_FLAG_REORDER_HDR;
274
275 new_dev->rtnl_link_ops = &vlan_link_ops;
276 err = register_vlan_dev(new_dev, NULL);
277 if (err < 0)
278 goto out_free_newdev;
279
280 return 0;
281
282 out_free_newdev:
283 if (new_dev->reg_state == NETREG_UNINITIALIZED)
284 free_netdev(new_dev);
285 return err;
286 }
287
288 static void vlan_sync_address(struct net_device *dev,
289 struct net_device *vlandev)
290 {
291 struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
292
293
294 if (ether_addr_equal(vlan->real_dev_addr, dev->dev_addr))
295 return;
296
297
298 if (vlan_dev_inherit_address(vlandev, dev))
299 goto out;
300
301
302
303 if (!ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) &&
304 ether_addr_equal(vlandev->dev_addr, dev->dev_addr))
305 dev_uc_del(dev, vlandev->dev_addr);
306
307
308
309 if (ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) &&
310 !ether_addr_equal(vlandev->dev_addr, dev->dev_addr))
311 dev_uc_add(dev, vlandev->dev_addr);
312
313 out:
314 ether_addr_copy(vlan->real_dev_addr, dev->dev_addr);
315 }
316
317 static void vlan_transfer_features(struct net_device *dev,
318 struct net_device *vlandev)
319 {
320 struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
321
322 vlandev->gso_max_size = dev->gso_max_size;
323 vlandev->gso_max_segs = dev->gso_max_segs;
324
325 if (vlan_hw_offload_capable(dev->features, vlan->vlan_proto))
326 vlandev->hard_header_len = dev->hard_header_len;
327 else
328 vlandev->hard_header_len = dev->hard_header_len + VLAN_HLEN;
329
330 #if IS_ENABLED(CONFIG_FCOE)
331 vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
332 #endif
333
334 vlandev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
335 vlandev->priv_flags |= (vlan->real_dev->priv_flags & IFF_XMIT_DST_RELEASE);
336 vlandev->hw_enc_features = vlan_tnl_features(vlan->real_dev);
337
338 netdev_update_features(vlandev);
339 }
340
341 static int __vlan_device_event(struct net_device *dev, unsigned long event)
342 {
343 int err = 0;
344
345 switch (event) {
346 case NETDEV_CHANGENAME:
347 vlan_proc_rem_dev(dev);
348 err = vlan_proc_add_dev(dev);
349 break;
350 case NETDEV_REGISTER:
351 err = vlan_proc_add_dev(dev);
352 break;
353 case NETDEV_UNREGISTER:
354 vlan_proc_rem_dev(dev);
355 break;
356 }
357
358 return err;
359 }
360
361 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
362 void *ptr)
363 {
364 struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr);
365 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
366 struct vlan_group *grp;
367 struct vlan_info *vlan_info;
368 int i, flgs;
369 struct net_device *vlandev;
370 struct vlan_dev_priv *vlan;
371 bool last = false;
372 LIST_HEAD(list);
373 int err;
374
375 if (is_vlan_dev(dev)) {
376 int err = __vlan_device_event(dev, event);
377
378 if (err)
379 return notifier_from_errno(err);
380 }
381
382 if ((event == NETDEV_UP) &&
383 (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)) {
384 pr_info("adding VLAN 0 to HW filter on device %s\n",
385 dev->name);
386 vlan_vid_add(dev, htons(ETH_P_8021Q), 0);
387 }
388 if (event == NETDEV_DOWN &&
389 (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER))
390 vlan_vid_del(dev, htons(ETH_P_8021Q), 0);
391
392 vlan_info = rtnl_dereference(dev->vlan_info);
393 if (!vlan_info)
394 goto out;
395 grp = &vlan_info->grp;
396
397
398
399
400
401 switch (event) {
402 case NETDEV_CHANGE:
403
404 vlan_group_for_each_dev(grp, i, vlandev)
405 vlan_stacked_transfer_operstate(dev, vlandev,
406 vlan_dev_priv(vlandev));
407 break;
408
409 case NETDEV_CHANGEADDR:
410
411 vlan_group_for_each_dev(grp, i, vlandev) {
412 flgs = vlandev->flags;
413 if (!(flgs & IFF_UP))
414 continue;
415
416 vlan_sync_address(dev, vlandev);
417 }
418 break;
419
420 case NETDEV_CHANGEMTU:
421 vlan_group_for_each_dev(grp, i, vlandev) {
422 if (vlandev->mtu <= dev->mtu)
423 continue;
424
425 dev_set_mtu(vlandev, dev->mtu);
426 }
427 break;
428
429 case NETDEV_FEAT_CHANGE:
430
431 vlan_group_for_each_dev(grp, i, vlandev)
432 vlan_transfer_features(dev, vlandev);
433 break;
434
435 case NETDEV_DOWN: {
436 struct net_device *tmp;
437 LIST_HEAD(close_list);
438
439
440 vlan_group_for_each_dev(grp, i, vlandev) {
441 flgs = vlandev->flags;
442 if (!(flgs & IFF_UP))
443 continue;
444
445 vlan = vlan_dev_priv(vlandev);
446 if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
447 list_add(&vlandev->close_list, &close_list);
448 }
449
450 dev_close_many(&close_list, false);
451
452 list_for_each_entry_safe(vlandev, tmp, &close_list, close_list) {
453 vlan_stacked_transfer_operstate(dev, vlandev,
454 vlan_dev_priv(vlandev));
455 list_del_init(&vlandev->close_list);
456 }
457 list_del(&close_list);
458 break;
459 }
460 case NETDEV_UP:
461
462 vlan_group_for_each_dev(grp, i, vlandev) {
463 flgs = dev_get_flags(vlandev);
464 if (flgs & IFF_UP)
465 continue;
466
467 vlan = vlan_dev_priv(vlandev);
468 if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
469 dev_change_flags(vlandev, flgs | IFF_UP,
470 extack);
471 vlan_stacked_transfer_operstate(dev, vlandev, vlan);
472 }
473 break;
474
475 case NETDEV_UNREGISTER:
476
477 if (dev->reg_state != NETREG_UNREGISTERING)
478 break;
479
480 vlan_group_for_each_dev(grp, i, vlandev) {
481
482
483 if (vlan_info->nr_vids == 1)
484 last = true;
485
486 unregister_vlan_dev(vlandev, &list);
487 if (last)
488 break;
489 }
490 unregister_netdevice_many(&list);
491 break;
492
493 case NETDEV_PRE_TYPE_CHANGE:
494
495 if (vlan_uses_dev(dev))
496 return NOTIFY_BAD;
497 break;
498
499 case NETDEV_NOTIFY_PEERS:
500 case NETDEV_BONDING_FAILOVER:
501 case NETDEV_RESEND_IGMP:
502
503 vlan_group_for_each_dev(grp, i, vlandev)
504 call_netdevice_notifiers(event, vlandev);
505 break;
506
507 case NETDEV_CVLAN_FILTER_PUSH_INFO:
508 err = vlan_filter_push_vids(vlan_info, htons(ETH_P_8021Q));
509 if (err)
510 return notifier_from_errno(err);
511 break;
512
513 case NETDEV_CVLAN_FILTER_DROP_INFO:
514 vlan_filter_drop_vids(vlan_info, htons(ETH_P_8021Q));
515 break;
516
517 case NETDEV_SVLAN_FILTER_PUSH_INFO:
518 err = vlan_filter_push_vids(vlan_info, htons(ETH_P_8021AD));
519 if (err)
520 return notifier_from_errno(err);
521 break;
522
523 case NETDEV_SVLAN_FILTER_DROP_INFO:
524 vlan_filter_drop_vids(vlan_info, htons(ETH_P_8021AD));
525 break;
526 }
527
528 out:
529 return NOTIFY_DONE;
530 }
531
532 static struct notifier_block vlan_notifier_block __read_mostly = {
533 .notifier_call = vlan_device_event,
534 };
535
536
537
538
539
540
541 static int vlan_ioctl_handler(struct net *net, void __user *arg)
542 {
543 int err;
544 struct vlan_ioctl_args args;
545 struct net_device *dev = NULL;
546
547 if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
548 return -EFAULT;
549
550
551 args.device1[sizeof(args.device1) - 1] = 0;
552 args.u.device2[sizeof(args.u.device2) - 1] = 0;
553
554 rtnl_lock();
555
556 switch (args.cmd) {
557 case SET_VLAN_INGRESS_PRIORITY_CMD:
558 case SET_VLAN_EGRESS_PRIORITY_CMD:
559 case SET_VLAN_FLAG_CMD:
560 case ADD_VLAN_CMD:
561 case DEL_VLAN_CMD:
562 case GET_VLAN_REALDEV_NAME_CMD:
563 case GET_VLAN_VID_CMD:
564 err = -ENODEV;
565 dev = __dev_get_by_name(net, args.device1);
566 if (!dev)
567 goto out;
568
569 err = -EINVAL;
570 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
571 goto out;
572 }
573
574 switch (args.cmd) {
575 case SET_VLAN_INGRESS_PRIORITY_CMD:
576 err = -EPERM;
577 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
578 break;
579 vlan_dev_set_ingress_priority(dev,
580 args.u.skb_priority,
581 args.vlan_qos);
582 err = 0;
583 break;
584
585 case SET_VLAN_EGRESS_PRIORITY_CMD:
586 err = -EPERM;
587 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
588 break;
589 err = vlan_dev_set_egress_priority(dev,
590 args.u.skb_priority,
591 args.vlan_qos);
592 break;
593
594 case SET_VLAN_FLAG_CMD:
595 err = -EPERM;
596 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
597 break;
598 err = vlan_dev_change_flags(dev,
599 args.vlan_qos ? args.u.flag : 0,
600 args.u.flag);
601 break;
602
603 case SET_VLAN_NAME_TYPE_CMD:
604 err = -EPERM;
605 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
606 break;
607 if (args.u.name_type < VLAN_NAME_TYPE_HIGHEST) {
608 struct vlan_net *vn;
609
610 vn = net_generic(net, vlan_net_id);
611 vn->name_type = args.u.name_type;
612 err = 0;
613 } else {
614 err = -EINVAL;
615 }
616 break;
617
618 case ADD_VLAN_CMD:
619 err = -EPERM;
620 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
621 break;
622 err = register_vlan_device(dev, args.u.VID);
623 break;
624
625 case DEL_VLAN_CMD:
626 err = -EPERM;
627 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
628 break;
629 unregister_vlan_dev(dev, NULL);
630 err = 0;
631 break;
632
633 case GET_VLAN_REALDEV_NAME_CMD:
634 err = 0;
635 vlan_dev_get_realdev_name(dev, args.u.device2);
636 if (copy_to_user(arg, &args,
637 sizeof(struct vlan_ioctl_args)))
638 err = -EFAULT;
639 break;
640
641 case GET_VLAN_VID_CMD:
642 err = 0;
643 args.u.VID = vlan_dev_vlan_id(dev);
644 if (copy_to_user(arg, &args,
645 sizeof(struct vlan_ioctl_args)))
646 err = -EFAULT;
647 break;
648
649 default:
650 err = -EOPNOTSUPP;
651 break;
652 }
653 out:
654 rtnl_unlock();
655 return err;
656 }
657
658 static int __net_init vlan_init_net(struct net *net)
659 {
660 struct vlan_net *vn = net_generic(net, vlan_net_id);
661 int err;
662
663 vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
664
665 err = vlan_proc_init(net);
666
667 return err;
668 }
669
670 static void __net_exit vlan_exit_net(struct net *net)
671 {
672 vlan_proc_cleanup(net);
673 }
674
675 static struct pernet_operations vlan_net_ops = {
676 .init = vlan_init_net,
677 .exit = vlan_exit_net,
678 .id = &vlan_net_id,
679 .size = sizeof(struct vlan_net),
680 };
681
682 static int __init vlan_proto_init(void)
683 {
684 int err;
685
686 pr_info("%s v%s\n", vlan_fullname, vlan_version);
687
688 err = register_pernet_subsys(&vlan_net_ops);
689 if (err < 0)
690 goto err0;
691
692 err = register_netdevice_notifier(&vlan_notifier_block);
693 if (err < 0)
694 goto err2;
695
696 err = vlan_gvrp_init();
697 if (err < 0)
698 goto err3;
699
700 err = vlan_mvrp_init();
701 if (err < 0)
702 goto err4;
703
704 err = vlan_netlink_init();
705 if (err < 0)
706 goto err5;
707
708 vlan_ioctl_set(vlan_ioctl_handler);
709 return 0;
710
711 err5:
712 vlan_mvrp_uninit();
713 err4:
714 vlan_gvrp_uninit();
715 err3:
716 unregister_netdevice_notifier(&vlan_notifier_block);
717 err2:
718 unregister_pernet_subsys(&vlan_net_ops);
719 err0:
720 return err;
721 }
722
723 static void __exit vlan_cleanup_module(void)
724 {
725 vlan_ioctl_set(NULL);
726
727 vlan_netlink_fini();
728
729 unregister_netdevice_notifier(&vlan_notifier_block);
730
731 unregister_pernet_subsys(&vlan_net_ops);
732 rcu_barrier();
733
734 vlan_mvrp_uninit();
735 vlan_gvrp_uninit();
736 }
737
738 module_init(vlan_proto_init);
739 module_exit(vlan_cleanup_module);
740
741 MODULE_LICENSE("GPL");
742 MODULE_VERSION(DRV_VERSION);