aboutsummaryrefslogtreecommitdiffstats
path: root/net/bridge/br_vlan.c
blob: 13013fe8db246d2002944d25b61f4db612116d52 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/rtnetlink.h>
#include <linux/slab.h>

#include "br_private.h"

static void __vlan_add_pvid(struct net_port_vlans *v, u16 vid)
{
	if (v->pvid == vid)
		return;

	smp_wmb();
	v->pvid = vid;
}

static void __vlan_delete_pvid(struct net_port_vlans *v, u16 vid)
{
	if (v->pvid != vid)
		return;

	smp_wmb();
	v->pvid = 0;
}

static void __vlan_add_flags(struct net_port_vlans *v, u16 vid, u16 flags)
{
	if (flags & BRIDGE_VLAN_INFO_PVID)
		__vlan_add_pvid(v, vid);
	else
		__vlan_delete_pvid(v, vid);

	if (flags & BRIDGE_VLAN_INFO_UNTAGGED)
		set_bit(vid, v->untagged_bitmap);
	else
		clear_bit(vid, v->untagged_bitmap);
}

static int __vlan_add(struct net_port_vlans *v, u16 vid, u16 flags)
{
	struct net_bridge_port *p = NULL;
	struct net_bridge *br;
	struct net_device *dev;
	int err;

	if (test_bit(vid, v->vlan_bitmap)) {
		__vlan_add_flags(v, vid, flags);
		return 0;
	}

	if (v->port_idx) {
		p = v->parent.port;
		br = p->br;
		dev = p->dev;
	} else {
		br = v->parent.br;
		dev = br->dev;
	}

	if (p) {
		/* Add VLAN to the device filter if it is supported.
		 * This ensures tagged traffic enters the bridge when
		 * promiscuous mode is disabled by br_manage_promisc().
		 */
		err = vlan_vid_add(dev, br->vlan_proto, vid);
		if (err)
			return err;
	}

	err = br_fdb_insert(br, p, dev->dev_addr, vid);
	if (err) {
		br_err(br, "failed insert local address into bridge "
		       "forwarding table\n");
		goto out_filt;
	}

	set_bit(vid, v->vlan_bitmap);
	v->num_vlans++;
	__vlan_add_flags(v, vid, flags);

	return 0;

out_filt:
	if (p)
		vlan_vid_del(dev, br->vlan_proto, vid);
	return err;
}

static int __vlan_del(struct net_port_vlans *v, u16 vid)
{
	if (!test_bit(vid, v->vlan_bitmap))
		return -EINVAL;

	__vlan_delete_pvid(v, vid);
	clear_bit(vid, v->untagged_bitmap);

	if (v->port_idx) {
		struct net_bridge_port *p = v->parent.port;
		vlan_vid_del(p->dev, p->br->vlan_proto, vid);
	}

	clear_bit(vid, v->vlan_bitmap);
	v->num_vlans--;
	if (bitmap_empty(v->vlan_bitmap, VLAN_N_VID)) {
		if (v->port_idx)
			RCU_INIT_POINTER(v->parent.port->vlan_info, NULL);
		else
			RCU_INIT_POINTER(v->parent.br->vlan_info, NULL);
		kfree_rcu(v, rcu);
	}
	return 0;
}

static void __vlan_flush(struct net_port_vlans *v)
{
	smp_wmb();
	v->pvid = 0;
	bitmap_zero(v->vlan_bitmap, VLAN_N_VID);
	if (v->port_idx)
		RCU_INIT_POINTER(v->parent.port->vlan_info, NULL);
	else
		RCU_INIT_POINTER(v->parent.br->vlan_info, NULL);
	kfree_rcu(v, rcu);
}

struct sk_buff *br_handle_vlan(struct net_bridge *br,
			       const struct net_port_vlans *pv,
			       struct sk_buff *skb)
{
	u16 vid;

	/* If this packet was not filtered at input, let it pass */
	if (!BR_INPUT_SKB_CB(skb)->vlan_filtered)
		goto out;

	/* Vlan filter table must be configured at this point.  The
	 * only exception is the bridge is set in promisc mode and the
	 * packet is destined for the bridge device.  In this case
	 * pass the packet as is.
	 */
	if (!pv) {
		if ((br->dev->flags & IFF_PROMISC) && skb->dev == br->dev) {
			goto out;
		} else {
			kfree_skb(skb);
			return NULL;
		}
	}

	/* At this point, we know that the frame was filtered and contains
	 * a valid vlan id.  If the vlan id is set in the untagged bitmap,
	 * send untagged; otherwise, send tagged.
	 */
	br_vlan_get_tag(skb, &vid);
	if (test_bit(vid, pv->untagged_bitmap))
		skb->vlan_tci = 0;

out:
	return skb;
}

/* Called under RCU */
bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v,
			struct sk_buff *skb, u16 *vid)
{
	bool tagged;
	__be16 proto;

	/* If VLAN filtering is disabled on the bridge, all packets are
	 * permitted.
	 */
	if (!br->vlan_enabled) {
		BR_INPUT_SKB_CB(skb)->vlan_filtered = false;
		return true;
	}

	/* If there are no vlan in the permitted list, all packets are
	 * rejected.
	 */
	if (!v)
		goto drop;

	BR_INPUT_SKB_CB(skb)->vlan_filtered = true;
	proto = br->vlan_proto;

	/* If vlan tx offload is disabled on bridge device and frame was
	 * sent from vlan device on the bridge device, it does not have
	 * HW accelerated vlan tag.
	 */
	if (unlikely(!skb_vlan_tag_present(skb) &&
		     skb->protocol == proto)) {
		skb = skb_vlan_untag(skb);
		if (unlikely(!skb))
			return false;
	}

	if (!br_vlan_get_tag(skb, vid)) {
		/* Tagged frame */
		if (skb->vlan_proto != proto) {
			/* Protocol-mismatch, empty out vlan_tci for new tag */
			skb_push(skb, ETH_HLEN);
			skb = vlan_insert_tag_set_proto(skb, skb->vlan_proto,
							skb_vlan_tag_get(skb));
			if (unlikely(!skb))
				return false;

			skb_pull(skb, ETH_HLEN);
			skb_reset_mac_len(skb);
			*vid = 0;
			tagged = false;
		} else {
			tagged = true;
		}
	} else {
		/* Untagged frame */
		tagged = false;
	}

	if (!*vid) {
		u16 pvid = br_get_pvid(v);

		/* Frame had a tag with VID 0 or did not have a tag.
		 * See if pvid is set on this port.  That tells us which
		 * vlan untagged or priority-tagged traffic belongs to.
		 */
		if (!pvid)
			goto drop;

		/* PVID is set on this port.  Any untagged or priority-tagged
		 * ingress frame is considered to belong to this vlan.
		 */
		*vid = pvid;
		if (likely(!tagged))
			/* Untagged Frame. */
			__vlan_hwaccel_put_tag(skb, proto, pvid);
		else
			/* Priority-tagged Frame.
			 * At this point, We know that skb->vlan_tci had
			 * VLAN_TAG_PRESENT bit and its VID field was 0x000.
			 * We update only VID field and preserve PCP field.
			 */
			skb->vlan_tci |= pvid;

		return true;
	}

	/* Frame had a valid vlan tag.  See if vlan is allowed */
	if (test_bit(*vid, v->vlan_bitmap))
		return true;
drop:
	kfree_skb(skb);
	return false;
}

/* Called under RCU. */
bool br_allowed_egress(struct net_bridge *br,
		       const struct net_port_vlans *v,
		       const struct sk_buff *skb)
{
	u16 vid;

	/* If this packet was not filtered at input, let it pass */
	if (!BR_INPUT_SKB_CB(skb)->vlan_filtered)
		return true;

	if (!v)
		return false;

	br_vlan_get_tag(skb, &vid);
	if (test_bit(vid, v->vlan_bitmap))
		return true;

	return false;
}

/* Called under RCU */
bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid)
{
	struct net_bridge *br = p->br;
	struct net_port_vlans *v;

	/* If filtering was disabled at input, let it pass. */
	if (!br->vlan_enabled)
		return true;

	v = rcu_dereference(p->vlan_info);
	if (!v)
		return false;

	if (!br_vlan_get_tag(skb, vid) && skb->vlan_proto != br->vlan_proto)
		*vid = 0;

	if (!*vid) {
		*vid = br_get_pvid(v);
		if (!*vid)
			return false;

		return true;
	}

	if (test_bit(*vid, v->vlan_bitmap))
		return true;

	return false;
}

/* Must be protected by RTNL.
 * Must be called with vid in range from 1 to 4094 inclusive.
 */
int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
{
	struct net_port_vlans *pv = NULL;
	int err;

	ASSERT_RTNL();

	pv = rtnl_dereference(br->vlan_info);
	if (pv)
		return __vlan_add(pv, vid, flags);

	/* Create port vlan infomration
	 */
	pv = kzalloc(sizeof(*pv), GFP_KERNEL);
	if (!pv)
		return -ENOMEM;

	pv->parent.br = br;
	err = __vlan_add(pv, vid, flags);
	if (err)
		goto out;

	rcu_assign_pointer(br->vlan_info, pv);
	return 0;
out:
	kfree(pv);
	return err;
}

/* Must be protected by RTNL.
 * Must be called with vid in range from 1 to 4094 inclusive.
 */
int br_vlan_delete(struct net_bridge *br, u16 vid)
{
	struct net_port_vlans *pv;

	ASSERT_RTNL();

	pv = rtnl_dereference(br->vlan_info);
	if (!pv)
		return -EINVAL;

	br_fdb_find_delete_local(br, NULL, br->dev->dev_addr, vid);

	__vlan_del(pv, vid);
	return 0;
}

void br_vlan_flush(struct net_bridge *br)
{
	struct net_port_vlans *pv;

	ASSERT_RTNL();
	pv = rtnl_dereference(br->vlan_info);
	if (!pv)
		return;

	__vlan_flush(pv);
}

bool br_vlan_find(struct net_bridge *br, u16 vid)
{
	struct net_port_vlans *pv;
	bool found = false;

	rcu_read_lock();
	pv = rcu_dereference(br->vlan_info);

	if (!pv)
		goto out;

	if (test_bit(vid, pv->vlan_bitmap))
		found = true;

out:
	rcu_read_unlock();
	return found;
}

/* Must be protected by RTNL. */
static void recalculate_group_addr(struct net_bridge *br)
{
	if (br->group_addr_set)
		return;

	spin_lock_bh(&br->lock);
	if (!br->vlan_enabled || br->vlan_proto == htons(ETH_P_8021Q)) {
		/* Bridge Group Address */
		br->group_addr[5] = 0x00;
	} else { /* vlan_enabled && ETH_P_8021AD */
		/* Provider Bridge Group Address */
		br->group_addr[5] = 0x08;
	}
	spin_unlock_bh(&br->lock);
}

/* Must be protected by RTNL. */
void br_recalculate_fwd_mask(struct net_bridge *br)
{
	if (!br->vlan_enabled || br->vlan_proto == htons(ETH_P_8021Q))
		br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
	else /* vlan_enabled && ETH_P_8021AD */
		br->group_fwd_mask_required = BR_GROUPFWD_8021AD &
					      ~(1u << br->group_addr[5]);
}

int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val)
{
	if (!rtnl_trylock())
		return restart_syscall();

	if (br->vlan_enabled == val)
		goto unlock;

	br->vlan_enabled = val;
	br_manage_promisc(br);
	recalculate_group_addr(br);
	br_recalculate_fwd_mask(br);

unlock:
	rtnl_unlock();
	return 0;
}

int br_vlan_set_proto(struct net_bridge *br, unsigned long val)
{
	int err = 0;
	struct net_bridge_port *p;
	struct net_port_vlans *pv;
	__be16 proto, oldproto;
	u16 vid, errvid;

	if (val != ETH_P_8021Q && val != ETH_P_8021AD)
		return -EPROTONOSUPPORT;

	if (!rtnl_trylock())
		return restart_syscall();

	proto = htons(val);
	if (br->vlan_proto == proto)
		goto unlock;

	/* Add VLANs for the new proto to the device filter. */
	list_for_each_entry(p, &br->port_list, list) {
		pv = rtnl_dereference(p->vlan_info);
		if (!pv)
			continue;

		for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) {
			err = vlan_vid_add(p->dev, proto, vid);
			if (err)
				goto err_filt;
		}
	}

	oldproto = br->vlan_proto;
	br->vlan_proto = proto;

	recalculate_group_addr(br);
	br_recalculate_fwd_mask(br);

	/* Delete VLANs for the old proto from the device filter. */
	list_for_each_entry(p, &br->port_list, list) {
		pv = rtnl_dereference(p->vlan_info);
		if (!pv)
			continue;

		for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID)
			vlan_vid_del(p->dev, oldproto, vid);
	}

unlock:
	rtnl_unlock();
	return err;

err_filt:
	errvid = vid;
	for_each_set_bit(vid, pv->vlan_bitmap, errvid)
		vlan_vid_del(p->dev, proto, vid);

	list_for_each_entry_continue_reverse(p, &br->port_list, list) {
		pv = rtnl_dereference(p->vlan_info);
		if (!pv)
			continue;

		for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID)
			vlan_vid_del(p->dev, proto, vid);
	}

	goto unlock;
}

static bool vlan_default_pvid(struct net_port_vlans *pv, u16 vid)
{
	return pv && vid == pv->pvid && test_bit(vid, pv->untagged_bitmap);
}

static void br_vlan_disable_default_pvid(struct net_bridge *br)
{
	struct net_bridge_port *p;
	u16 pvid = br->default_pvid;

	/* Disable default_pvid on all ports where it is still
	 * configured.
	 */
	if (vlan_default_pvid(br_get_vlan_info(br), pvid))
		br_vlan_delete(br, pvid);

	list_for_each_entry(p, &br->port_list, list) {
		if (vlan_default_pvid(nbp_get_vlan_info(p), pvid))
			nbp_vlan_delete(p, pvid);
	}

	br->default_pvid = 0;
}

static int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid)
{
	struct net_bridge_port *p;
	u16 old_pvid;
	int err = 0;
	unsigned long *changed;

	changed = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long),
			  GFP_KERNEL);
	if (!changed)
		return -ENOMEM;

	old_pvid = br->default_pvid;

	/* Update default_pvid config only if we do not conflict with
	 * user configuration.
	 */
	if ((!old_pvid || vlan_default_pvid(br_get_vlan_info(br), old_pvid)) &&
	    !br_vlan_find(br, pvid)) {
		err = br_vlan_add(br, pvid,
				  BRIDGE_VLAN_INFO_PVID |
				  BRIDGE_VLAN_INFO_UNTAGGED);
		if (err)
			goto out;
		br_vlan_delete(br, old_pvid);
		set_bit(0, changed);
	}

	list_for_each_entry(p, &br->port_list, list) {
		/* Update default_pvid config only if we do not conflict with
		 * user configuration.
		 */
		if ((old_pvid &&
		     !vlan_default_pvid(nbp_get_vlan_info(p), old_pvid)) ||
		    nbp_vlan_find(p, pvid))
			continue;

		err = nbp_vlan_add(p, pvid,
				   BRIDGE_VLAN_INFO_PVID |
				   BRIDGE_VLAN_INFO_UNTAGGED);
		if (err)
			goto err_port;
		nbp_vlan_delete(p, old_pvid);
		set_bit(p->port_no, changed);
	}

	br->default_pvid = pvid;

out:
	kfree(changed);
	return err;

err_port:
	list_for_each_entry_continue_reverse(p, &br->port_list, list) {
		if (!test_bit(p->port_no, changed))
			continue;

		if (old_pvid)
			nbp_vlan_add(p, old_pvid,
				     BRIDGE_VLAN_INFO_PVID |
				     BRIDGE_VLAN_INFO_UNTAGGED);
		nbp_vlan_delete(p, pvid);
	}

	if (test_bit(0, changed)) {
		if (old_pvid)
			br_vlan_add(br, old_pvid,
				    BRIDGE_VLAN_INFO_PVID |
				    BRIDGE_VLAN_INFO_UNTAGGED);
		br_vlan_delete(br, pvid);
	}
	goto out;
}

int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val)
{
	u16 pvid = val;
	int err = 0;

	if (val >= VLAN_VID_MASK)
		return -EINVAL;

	if (!rtnl_trylock())
		return restart_syscall();

	if (pvid == br->default_pvid)
		goto unlock;

	/* Only allow default pvid change when filtering is disabled */
	if (br->vlan_enabled) {
		pr_info_once("Please disable vlan filtering to change default_pvid\n");
		err = -EPERM;
		goto unlock;
	}

	if (!pvid)
		br_vlan_disable_default_pvid(br);
	else
		err = __br_vlan_set_default_pvid(br, pvid);

unlock:
	rtnl_unlock();
	return err;
}

int br_vlan_init(struct net_bridge *br)
{
	br->vlan_proto = htons(ETH_P_8021Q);
	br->default_pvid = 1;
	return br_vlan_add(br, 1,
			   BRIDGE_VLAN_INFO_PVID | BRIDGE_VLAN_INFO_UNTAGGED);
}

/* Must be protected by RTNL.
 * Must be called with vid in range from 1 to 4094 inclusive.
 */
int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
{
	struct net_port_vlans *pv = NULL;
	int err;

	ASSERT_RTNL();

	pv = rtnl_dereference(port->vlan_info);
	if (pv)
		return __vlan_add(pv, vid, flags);

	/* Create port vlan infomration
	 */
	pv = kzalloc(sizeof(*pv), GFP_KERNEL);
	if (!pv) {
		err = -ENOMEM;
		goto clean_up;
	}

	pv->port_idx = port->port_no;
	pv->parent.port = port;
	err = __vlan_add(pv, vid, flags);
	if (err)
		goto clean_up;

	rcu_assign_pointer(port->vlan_info, pv);
	return 0;

clean_up:
	kfree(pv);
	return err;
}

/* Must be protected by RTNL.
 * Must be called with vid in range from 1 to 4094 inclusive.
 */
int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
{
	struct net_port_vlans *pv;

	ASSERT_RTNL();

	pv = rtnl_dereference(port->vlan_info);
	if (!pv)
		return -EINVAL;

	br_fdb_find_delete_local(port->br, port, port->dev->dev_addr, vid);

	return __vlan_del(pv, vid);
}

void nbp_vlan_flush(struct net_bridge_port *port)
{
	struct net_port_vlans *pv;
	u16 vid;

	ASSERT_RTNL();

	pv = rtnl_dereference(port->vlan_info);
	if (!pv)
		return;

	for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID)
		vlan_vid_del(port->dev, port->br->vlan_proto, vid);

	__vlan_flush(pv);
}

bool nbp_vlan_find(struct net_bridge_port *port, u16 vid)
{
	struct net_port_vlans *pv;
	bool found = false;

	rcu_read_lock();
	pv = rcu_dereference(port->vlan_info);

	if (!pv)
		goto out;

	if (test_bit(vid, pv->vlan_bitmap))
		found = true;

out:
	rcu_read_unlock();
	return found;
}

int nbp_vlan_init(struct net_bridge_port *p)
{
	return p->br->default_pvid ?
			nbp_vlan_add(p, p->br->default_pvid,
				     BRIDGE_VLAN_INFO_PVID |
				     BRIDGE_VLAN_INFO_UNTAGGED) :
			0;
}