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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
43unsigned int vlan_net_id __read_mostly;
44
45const char vlan_fullname[] = "802.1Q VLAN Support";
46const char vlan_version[] = DRV_VERSION;
47
48
49
50static 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 vidx;
55 unsigned int size;
56 int pidx;
57
58 ASSERT_RTNL();
59
60 pidx = vlan_proto_idx(vlan_proto);
61 if (pidx < 0)
62 return -EINVAL;
63
64 vidx = vlan_id / VLAN_GROUP_ARRAY_PART_LEN;
65 array = vg->vlan_devices_arrays[pidx][vidx];
66 if (array != NULL)
67 return 0;
68
69 size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
70 array = kzalloc(size, GFP_KERNEL_ACCOUNT);
71 if (array == NULL)
72 return -ENOBUFS;
73
74
75 smp_wmb();
76
77 vg->vlan_devices_arrays[pidx][vidx] = array;
78 return 0;
79}
80
81static void vlan_stacked_transfer_operstate(const struct net_device *rootdev,
82 struct net_device *dev,
83 struct vlan_dev_priv *vlan)
84{
85 if (!(vlan->flags & VLAN_FLAG_BRIDGE_BINDING))
86 netif_stacked_transfer_operstate(rootdev, dev);
87}
88
89void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
90{
91 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
92 struct net_device *real_dev = vlan->real_dev;
93 struct vlan_info *vlan_info;
94 struct vlan_group *grp;
95 u16 vlan_id = vlan->vlan_id;
96
97 ASSERT_RTNL();
98
99 vlan_info = rtnl_dereference(real_dev->vlan_info);
100 BUG_ON(!vlan_info);
101
102 grp = &vlan_info->grp;
103
104 grp->nr_vlan_devs--;
105
106 if (vlan->flags & VLAN_FLAG_MVRP)
107 vlan_mvrp_request_leave(dev);
108 if (vlan->flags & VLAN_FLAG_GVRP)
109 vlan_gvrp_request_leave(dev);
110
111 vlan_group_set_device(grp, vlan->vlan_proto, vlan_id, NULL);
112
113 netdev_upper_dev_unlink(real_dev, dev);
114
115
116
117
118 unregister_netdevice_queue(dev, head);
119
120 if (grp->nr_vlan_devs == 0) {
121 vlan_mvrp_uninit_applicant(real_dev);
122 vlan_gvrp_uninit_applicant(real_dev);
123 }
124
125 vlan_vid_del(real_dev, vlan->vlan_proto, vlan_id);
126}
127
128int vlan_check_real_dev(struct net_device *real_dev,
129 __be16 protocol, u16 vlan_id,
130 struct netlink_ext_ack *extack)
131{
132 const char *name = real_dev->name;
133
134 if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
135 pr_info("VLANs not supported on %s\n", name);
136 NL_SET_ERR_MSG_MOD(extack, "VLANs not supported on device");
137 return -EOPNOTSUPP;
138 }
139
140 if (vlan_find_dev(real_dev, protocol, vlan_id) != NULL) {
141 NL_SET_ERR_MSG_MOD(extack, "VLAN device already exists");
142 return -EEXIST;
143 }
144
145 return 0;
146}
147
148int register_vlan_dev(struct net_device *dev, struct netlink_ext_ack *extack)
149{
150 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
151 struct net_device *real_dev = vlan->real_dev;
152 u16 vlan_id = vlan->vlan_id;
153 struct vlan_info *vlan_info;
154 struct vlan_group *grp;
155 int err;
156
157 err = vlan_vid_add(real_dev, vlan->vlan_proto, vlan_id);
158 if (err)
159 return err;
160
161 vlan_info = rtnl_dereference(real_dev->vlan_info);
162
163 BUG_ON(!vlan_info);
164
165 grp = &vlan_info->grp;
166 if (grp->nr_vlan_devs == 0) {
167 err = vlan_gvrp_init_applicant(real_dev);
168 if (err < 0)
169 goto out_vid_del;
170 err = vlan_mvrp_init_applicant(real_dev);
171 if (err < 0)
172 goto out_uninit_gvrp;
173 }
174
175 err = vlan_group_prealloc_vid(grp, vlan->vlan_proto, vlan_id);
176 if (err < 0)
177 goto out_uninit_mvrp;
178
179 err = register_netdevice(dev);
180 if (err < 0)
181 goto out_uninit_mvrp;
182
183 err = netdev_upper_dev_link(real_dev, dev, extack);
184 if (err)
185 goto out_unregister_netdev;
186
187 vlan_stacked_transfer_operstate(real_dev, dev, vlan);
188 linkwatch_fire_event(dev);
189
190
191
192
193 vlan_group_set_device(grp, vlan->vlan_proto, vlan_id, dev);
194 grp->nr_vlan_devs++;
195
196 return 0;
197
198out_unregister_netdev:
199 unregister_netdevice(dev);
200out_uninit_mvrp:
201 if (grp->nr_vlan_devs == 0)
202 vlan_mvrp_uninit_applicant(real_dev);
203out_uninit_gvrp:
204 if (grp->nr_vlan_devs == 0)
205 vlan_gvrp_uninit_applicant(real_dev);
206out_vid_del:
207 vlan_vid_del(real_dev, vlan->vlan_proto, vlan_id);
208 return err;
209}
210
211
212
213
214static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
215{
216 struct net_device *new_dev;
217 struct vlan_dev_priv *vlan;
218 struct net *net = dev_net(real_dev);
219 struct vlan_net *vn = net_generic(net, vlan_net_id);
220 char name[IFNAMSIZ];
221 int err;
222
223 if (vlan_id >= VLAN_VID_MASK)
224 return -ERANGE;
225
226 err = vlan_check_real_dev(real_dev, htons(ETH_P_8021Q), vlan_id,
227 NULL);
228 if (err < 0)
229 return err;
230
231
232 switch (vn->name_type) {
233 case VLAN_NAME_TYPE_RAW_PLUS_VID:
234
235 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
236 break;
237 case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
238
239
240
241 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
242 break;
243 case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
244
245
246
247 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
248 break;
249 case VLAN_NAME_TYPE_PLUS_VID:
250
251
252
253 default:
254 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
255 }
256
257 new_dev = alloc_netdev(sizeof(struct vlan_dev_priv), name,
258 NET_NAME_UNKNOWN, vlan_setup);
259
260 if (new_dev == NULL)
261 return -ENOBUFS;
262
263 dev_net_set(new_dev, net);
264
265
266
267 new_dev->mtu = real_dev->mtu;
268
269 vlan = vlan_dev_priv(new_dev);
270 vlan->vlan_proto = htons(ETH_P_8021Q);
271 vlan->vlan_id = vlan_id;
272 vlan->real_dev = real_dev;
273 vlan->dent = NULL;
274 vlan->flags = VLAN_FLAG_REORDER_HDR;
275
276 new_dev->rtnl_link_ops = &vlan_link_ops;
277 err = register_vlan_dev(new_dev, NULL);
278 if (err < 0)
279 goto out_free_newdev;
280
281 return 0;
282
283out_free_newdev:
284 free_netdev(new_dev);
285 return err;
286}
287
288static 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
313out:
314 ether_addr_copy(vlan->real_dev_addr, dev->dev_addr);
315}
316
317static 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
341static 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
361static 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
528out:
529 return NOTIFY_DONE;
530}
531
532static struct notifier_block vlan_notifier_block __read_mostly = {
533 .notifier_call = vlan_device_event,
534};
535
536
537
538
539
540
541static 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 sizeof(args.u.device2));
637 if (copy_to_user(arg, &args,
638 sizeof(struct vlan_ioctl_args)))
639 err = -EFAULT;
640 break;
641
642 case GET_VLAN_VID_CMD:
643 err = 0;
644 args.u.VID = vlan_dev_vlan_id(dev);
645 if (copy_to_user(arg, &args,
646 sizeof(struct vlan_ioctl_args)))
647 err = -EFAULT;
648 break;
649
650 default:
651 err = -EOPNOTSUPP;
652 break;
653 }
654out:
655 rtnl_unlock();
656 return err;
657}
658
659static int __net_init vlan_init_net(struct net *net)
660{
661 struct vlan_net *vn = net_generic(net, vlan_net_id);
662 int err;
663
664 vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
665
666 err = vlan_proc_init(net);
667
668 return err;
669}
670
671static void __net_exit vlan_exit_net(struct net *net)
672{
673 vlan_proc_cleanup(net);
674}
675
676static struct pernet_operations vlan_net_ops = {
677 .init = vlan_init_net,
678 .exit = vlan_exit_net,
679 .id = &vlan_net_id,
680 .size = sizeof(struct vlan_net),
681};
682
683static int __init vlan_proto_init(void)
684{
685 int err;
686
687 pr_info("%s v%s\n", vlan_fullname, vlan_version);
688
689 err = register_pernet_subsys(&vlan_net_ops);
690 if (err < 0)
691 goto err0;
692
693 err = register_netdevice_notifier(&vlan_notifier_block);
694 if (err < 0)
695 goto err2;
696
697 err = vlan_gvrp_init();
698 if (err < 0)
699 goto err3;
700
701 err = vlan_mvrp_init();
702 if (err < 0)
703 goto err4;
704
705 err = vlan_netlink_init();
706 if (err < 0)
707 goto err5;
708
709 vlan_ioctl_set(vlan_ioctl_handler);
710 return 0;
711
712err5:
713 vlan_mvrp_uninit();
714err4:
715 vlan_gvrp_uninit();
716err3:
717 unregister_netdevice_notifier(&vlan_notifier_block);
718err2:
719 unregister_pernet_subsys(&vlan_net_ops);
720err0:
721 return err;
722}
723
724static void __exit vlan_cleanup_module(void)
725{
726 vlan_ioctl_set(NULL);
727
728 vlan_netlink_fini();
729
730 unregister_netdevice_notifier(&vlan_notifier_block);
731
732 unregister_pernet_subsys(&vlan_net_ops);
733 rcu_barrier();
734
735 vlan_mvrp_uninit();
736 vlan_gvrp_uninit();
737}
738
739module_init(vlan_proto_init);
740module_exit(vlan_cleanup_module);
741
742MODULE_LICENSE("GPL");
743MODULE_VERSION(DRV_VERSION);
744