vlan_dev.c 19.4 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1
2
3
4
5
6
7
/* -*- linux-c -*-
 * INET		802.1Q VLAN
 *		Ethernet-type device handling.
 *
 * Authors:	Ben Greear <greearb@candelatech.com>
 *              Please send support related email to: vlan@scry.wanfear.com
 *              VLAN Home Page: http://www.candelatech.com/~greear/vlan.html
8
 *
Linus Torvalds's avatar
Linus Torvalds committed
9
10
11
12
13
14
 * Fixes:       Mar 22 2001: Martin Bokaemper <mbokaemper@unispherenetworks.com>
 *                - reset skb->pkt_type on incoming packets when MAC was changed
 *                - see that changed MAC is saddr for outgoing packets
 *              Oct 20, 2001:  Ard van Breeman:
 *                - Fix MC-list, finally.
 *                - Flush MC-list on VLAN destroy.
15
 *
Linus Torvalds's avatar
Linus Torvalds committed
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
 *
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 */

#include <linux/module.h>
#include <linux/mm.h>
#include <linux/in.h>
#include <linux/init.h>
#include <asm/uaccess.h> /* for copy_from_user */
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <net/datalink.h>
#include <net/p8022.h>
#include <net/arp.h>

#include "vlan.h"
#include "vlanproc.h"
#include <linux/if_vlan.h>
#include <net/ip.h>

/*
 *	Rebuild the Ethernet MAC header. This is called after an ARP
 *	(or in future other address resolution) has completed on this
 *	sk_buff. We now let ARP fill in the other fields.
 *
 *	This routine CANNOT use cached dst->neigh!
 *	Really, it is used only when dst->neigh is wrong.
 *
 * TODO:  This needs a checkup, I'm ignorant here. --BLG
 */
int vlan_dev_rebuild_header(struct sk_buff *skb)
{
	struct net_device *dev = skb->dev;
	struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);

	switch (veth->h_vlan_encapsulated_proto) {
#ifdef CONFIG_INET
	case __constant_htons(ETH_P_IP):

		/* TODO:  Confirm this will work with VLAN headers... */
		return arp_find(veth->h_dest, skb);
61
#endif
Linus Torvalds's avatar
Linus Torvalds committed
62
63
	default:
		printk(VLAN_DBG
64
		       "%s: unable to resolve type %X addresses.\n",
65
		       dev->name, ntohs(veth->h_vlan_encapsulated_proto));
66

Linus Torvalds's avatar
Linus Torvalds committed
67
68
		memcpy(veth->h_source, dev->dev_addr, ETH_ALEN);
		break;
69
	}
Linus Torvalds's avatar
Linus Torvalds committed
70
71
72
73
74
75

	return 0;
}

static inline struct sk_buff *vlan_check_reorder_header(struct sk_buff *skb)
{
76
	if (VLAN_DEV_INFO(skb->dev)->flags & VLAN_FLAG_REORDER_HDR) {
Linus Torvalds's avatar
Linus Torvalds committed
77
78
79
80
81
82
83
84
85
		if (skb_shared(skb) || skb_cloned(skb)) {
			struct sk_buff *nskb = skb_copy(skb, GFP_ATOMIC);
			kfree_skb(skb);
			skb = nskb;
		}
		if (skb) {
			/* Lifted from Gleb's VLAN code... */
			memmove(skb->data - ETH_HLEN,
				skb->data - VLAN_ETH_HLEN, 12);
86
			skb->mac_header += VLAN_HLEN;
Linus Torvalds's avatar
Linus Torvalds committed
87
88
89
90
91
92
93
		}
	}

	return skb;
}

/*
94
 *	Determine the packet's protocol ID. The rule here is that we
Linus Torvalds's avatar
Linus Torvalds committed
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
 *	assume 802.3 if the type field is short enough to be a length.
 *	This is normal practice and works for any 'now in use' protocol.
 *
 *  Also, at this point we assume that we ARE dealing exclusively with
 *  VLAN packets, or packets that should be made into VLAN packets based
 *  on a default VLAN ID.
 *
 *  NOTE:  Should be similar to ethernet/eth.c.
 *
 *  SANITY NOTE:  This method is called when a packet is moving up the stack
 *                towards userland.  To get here, it would have already passed
 *                through the ethernet/eth.c eth_type_trans() method.
 *  SANITY NOTE 2: We are referencing to the VLAN_HDR frields, which MAY be
 *                 stored UNALIGNED in the memory.  RISC systems don't like
 *                 such cases very much...
 *  SANITY NOTE 2a:  According to Dave Miller & Alexey, it will always be aligned,
 *                 so there doesn't need to be any of the unaligned stuff.  It has
 *                 been commented out now...  --Ben
 *
 */
int vlan_skb_recv(struct sk_buff *skb, struct net_device *dev,
116
		  struct packet_type* ptype, struct net_device *orig_dev)
Linus Torvalds's avatar
Linus Torvalds committed
117
118
{
	unsigned char *rawp = NULL;
119
	struct vlan_hdr *vhdr;
Linus Torvalds's avatar
Linus Torvalds committed
120
121
122
	unsigned short vid;
	struct net_device_stats *stats;
	unsigned short vlan_TCI;
123
	__be16 proto;
Linus Torvalds's avatar
Linus Torvalds committed
124

125
126
127
128
129
130
131
132
133
134
	if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
		return -1;

	if (unlikely(!pskb_may_pull(skb, VLAN_HLEN))) {
		kfree_skb(skb);
		return -1;
	}

	vhdr = (struct vlan_hdr *)(skb->data);

Linus Torvalds's avatar
Linus Torvalds committed
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
	/* vlan_TCI = ntohs(get_unaligned(&vhdr->h_vlan_TCI)); */
	vlan_TCI = ntohs(vhdr->h_vlan_TCI);

	vid = (vlan_TCI & VLAN_VID_MASK);

#ifdef VLAN_DEBUG
	printk(VLAN_DBG "%s: skb: %p vlan_id: %hx\n",
		__FUNCTION__, skb, vid);
#endif

	/* Ok, we will find the correct VLAN device, strip the header,
	 * and then go on as usual.
	 */

	/* We have 12 bits of vlan ID.
	 *
	 * We must not drop allow preempt until we hold a
	 * reference to the device (netif_rx does that) or we
	 * fail.
	 */

	rcu_read_lock();
	skb->dev = __find_vlan_dev(dev, vid);
	if (!skb->dev) {
		rcu_read_unlock();

#ifdef VLAN_DEBUG
		printk(VLAN_DBG "%s: ERROR: No net_device for VID: %i on dev: %s [%i]\n",
			__FUNCTION__, (unsigned int)(vid), dev->name, dev->ifindex);
#endif
		kfree_skb(skb);
		return -1;
	}

	skb->dev->last_rx = jiffies;

	/* Bump the rx counters for the VLAN device. */
	stats = vlan_dev_get_stats(skb->dev);
	stats->rx_packets++;
	stats->rx_bytes += skb->len;

176
177
	/* Take off the VLAN header (4 bytes currently) */
	skb_pull_rcsum(skb, VLAN_HLEN);
178

Linus Torvalds's avatar
Linus Torvalds committed
179
180
181
182
183
184
185
186
187
	/* Ok, lets check to make sure the device (dev) we
	 * came in on is what this VLAN is attached to.
	 */

	if (dev != VLAN_DEV_INFO(skb->dev)->real_dev) {
		rcu_read_unlock();

#ifdef VLAN_DEBUG
		printk(VLAN_DBG "%s: dropping skb: %p because came in on wrong device, dev: %s  real_dev: %s, skb_dev: %s\n",
188
189
			__FUNCTION__, skb, dev->name,
			VLAN_DEV_INFO(skb->dev)->real_dev->name,
Linus Torvalds's avatar
Linus Torvalds committed
190
191
192
193
194
195
196
197
198
199
200
201
202
203
			skb->dev->name);
#endif
		kfree_skb(skb);
		stats->rx_errors++;
		return -1;
	}

	/*
	 * Deal with ingress priority mapping.
	 */
	skb->priority = vlan_get_ingress_priority(skb->dev, ntohs(vhdr->h_vlan_TCI));

#ifdef VLAN_DEBUG
	printk(VLAN_DBG "%s: priority: %lu  for TCI: %hu (hbo)\n",
204
		__FUNCTION__, (unsigned long)(skb->priority),
Linus Torvalds's avatar
Linus Torvalds committed
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
		ntohs(vhdr->h_vlan_TCI));
#endif

	/* The ethernet driver already did the pkt_type calculations
	 * for us...
	 */
	switch (skb->pkt_type) {
	case PACKET_BROADCAST: /* Yeah, stats collect these together.. */
		// stats->broadcast ++; // no such counter :-(
		break;

	case PACKET_MULTICAST:
		stats->multicast++;
		break;

220
	case PACKET_OTHERHOST:
Linus Torvalds's avatar
Linus Torvalds committed
221
222
223
224
		/* Our lower layer thinks this is not local, let's make sure.
		 * This allows the VLAN to have a different MAC than the underlying
		 * device, and still route correctly.
		 */
225
		if (!compare_ether_addr(eth_hdr(skb)->h_dest, skb->dev->dev_addr)) {
Linus Torvalds's avatar
Linus Torvalds committed
226
227
228
229
230
231
			/* It is for our (changed) MAC-address! */
			skb->pkt_type = PACKET_HOST;
		}
		break;
	default:
		break;
232
	}
Linus Torvalds's avatar
Linus Torvalds committed
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

	/*  Was a VLAN packet, grab the encapsulated protocol, which the layer
	 * three protocols care about.
	 */
	/* proto = get_unaligned(&vhdr->h_vlan_encapsulated_proto); */
	proto = vhdr->h_vlan_encapsulated_proto;

	skb->protocol = proto;
	if (ntohs(proto) >= 1536) {
		/* place it back on the queue to be handled by
		 * true layer 3 protocols.
		 */

		/* See if we are configured to re-write the VLAN header
		 * to make it look like ethernet...
		 */
		skb = vlan_check_reorder_header(skb);

		/* Can be null if skb-clone fails when re-ordering */
		if (skb) {
			netif_rx(skb);
		} else {
			/* TODO:  Add a more specific counter here. */
			stats->rx_errors++;
		}
		rcu_read_unlock();
		return 0;
	}

	rawp = skb->data;

	/*
	 * This is a magic hack to spot IPX packets. Older Novell breaks
	 * the protocol design and runs IPX over 802.3 without an 802.2 LLC
	 * layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This
	 * won't work for fault tolerant netware but does for the rest.
	 */
	if (*(unsigned short *)rawp == 0xFFFF) {
271
		skb->protocol = htons(ETH_P_802_3);
Linus Torvalds's avatar
Linus Torvalds committed
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
		/* place it back on the queue to be handled by true layer 3 protocols.
		 */

		/* See if we are configured to re-write the VLAN header
		 * to make it look like ethernet...
		 */
		skb = vlan_check_reorder_header(skb);

		/* Can be null if skb-clone fails when re-ordering */
		if (skb) {
			netif_rx(skb);
		} else {
			/* TODO:  Add a more specific counter here. */
			stats->rx_errors++;
		}
		rcu_read_unlock();
		return 0;
	}

	/*
	 *	Real 802.2 LLC
	 */
294
	skb->protocol = htons(ETH_P_802_2);
Linus Torvalds's avatar
Linus Torvalds committed
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
	/* place it back on the queue to be handled by upper layer protocols.
	 */

	/* See if we are configured to re-write the VLAN header
	 * to make it look like ethernet...
	 */
	skb = vlan_check_reorder_header(skb);

	/* Can be null if skb-clone fails when re-ordering */
	if (skb) {
		netif_rx(skb);
	} else {
		/* TODO:  Add a more specific counter here. */
		stats->rx_errors++;
	}
	rcu_read_unlock();
	return 0;
}

static inline unsigned short vlan_dev_get_egress_qos_mask(struct net_device* dev,
							  struct sk_buff* skb)
{
	struct vlan_priority_tci_mapping *mp =
		VLAN_DEV_INFO(dev)->egress_priority_map[(skb->priority & 0xF)];

	while (mp) {
		if (mp->priority == skb->priority) {
			return mp->vlan_qos; /* This should already be shifted to mask
					      * correctly with the VLAN's TCI
					      */
		}
		mp = mp->next;
	}
	return 0;
}

/*
332
 *	Create the VLAN header for an arbitrary protocol layer
Linus Torvalds's avatar
Linus Torvalds committed
333
334
335
336
337
338
339
340
 *
 *	saddr=NULL	means use device source address
 *	daddr=NULL	means leave destination address (eg unresolved arp)
 *
 *  This is called when the SKB is moving down the stack towards the
 *  physical devices.
 */
int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
341
342
			 unsigned short type, void *daddr, void *saddr,
			 unsigned len)
Linus Torvalds's avatar
Linus Torvalds committed
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
{
	struct vlan_hdr *vhdr;
	unsigned short veth_TCI = 0;
	int rc = 0;
	int build_vlan_header = 0;
	struct net_device *vdev = dev; /* save this for the bottom of the method */

#ifdef VLAN_DEBUG
	printk(VLAN_DBG "%s: skb: %p type: %hx len: %x vlan_id: %hx, daddr: %p\n",
		__FUNCTION__, skb, type, len, VLAN_DEV_INFO(dev)->vlan_id, daddr);
#endif

	/* build vlan header only if re_order_header flag is NOT set.  This
	 * fixes some programs that get confused when they see a VLAN device
	 * sending a frame that is VLAN encoded (the consensus is that the VLAN
	 * device should look completely like an Ethernet device when the
359
	 * REORDER_HEADER flag is set)	The drawback to this is some extra
Linus Torvalds's avatar
Linus Torvalds committed
360
361
362
	 * header shuffling in the hard_start_xmit.  Users can turn off this
	 * REORDER behaviour with the vconfig tool.
	 */
363
364
	if (!(VLAN_DEV_INFO(dev)->flags & VLAN_FLAG_REORDER_HDR))
		build_vlan_header = 1;
Linus Torvalds's avatar
Linus Torvalds committed
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

	if (build_vlan_header) {
		vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);

		/* build the four bytes that make this a VLAN header. */

		/* Now, construct the second two bytes. This field looks something
		 * like:
		 * usr_priority: 3 bits	 (high bits)
		 * CFI		 1 bit
		 * VLAN ID	 12 bits (low bits)
		 *
		 */
		veth_TCI = VLAN_DEV_INFO(dev)->vlan_id;
		veth_TCI |= vlan_dev_get_egress_qos_mask(dev, skb);

		vhdr->h_vlan_TCI = htons(veth_TCI);

		/*
		 *  Set the protocol type.
		 *  For a packet of type ETH_P_802_3 we put the length in here instead.
		 *  It is up to the 802.2 layer to carry protocol information.
		 */

		if (type != ETH_P_802_3) {
			vhdr->h_vlan_encapsulated_proto = htons(type);
		} else {
			vhdr->h_vlan_encapsulated_proto = htons(len);
		}
394
395

		skb->protocol = htons(ETH_P_8021Q);
396
		skb_reset_network_header(skb);
Linus Torvalds's avatar
Linus Torvalds committed
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
	}

	/* Before delegating work to the lower layer, enter our MAC-address */
	if (saddr == NULL)
		saddr = dev->dev_addr;

	dev = VLAN_DEV_INFO(dev)->real_dev;

	/* MPLS can send us skbuffs w/out enough space.	 This check will grow the
	 * skb if it doesn't have enough headroom.  Not a beautiful solution, so
	 * I'll tick a counter so that users can know it's happening...	 If they
	 * care...
	 */

	/* NOTE:  This may still break if the underlying device is not the final
	 * device (and thus there are more headers to add...)  It should work for
	 * good-ole-ethernet though.
	 */
	if (skb_headroom(skb) < dev->hard_header_len) {
		struct sk_buff *sk_tmp = skb;
		skb = skb_realloc_headroom(sk_tmp, dev->hard_header_len);
		kfree_skb(sk_tmp);
		if (skb == NULL) {
			struct net_device_stats *stats = vlan_dev_get_stats(vdev);
			stats->tx_dropped++;
			return -ENOMEM;
		}
		VLAN_DEV_INFO(vdev)->cnt_inc_headroom_on_tx++;
#ifdef VLAN_DEBUG
		printk(VLAN_DBG "%s: %s: had to grow skb.\n", __FUNCTION__, vdev->name);
#endif
	}

	if (build_vlan_header) {
		/* Now make the underlying real hard header */
		rc = dev->hard_header(skb, dev, ETH_P_8021Q, daddr, saddr, len + VLAN_HLEN);

		if (rc > 0) {
			rc += VLAN_HLEN;
		} else if (rc < 0) {
			rc -= VLAN_HLEN;
		}
	} else {
		/* If here, then we'll just make a normal looking ethernet frame,
		 * but, the hard_start_xmit method will insert the tag (it has to
		 * be able to do this for bridged and other skbs that don't come
		 * down the protocol stack in an orderly manner.
		 */
		rc = dev->hard_header(skb, dev, type, daddr, saddr, len);
	}

	return rc;
}

int vlan_dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct net_device_stats *stats = vlan_dev_get_stats(dev);
	struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);

	/* Handle non-VLAN frames if they are sent to us, for example by DHCP.
	 *
	 * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
	 * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
	 */

462
	if (veth->h_vlan_proto != htons(ETH_P_8021Q)) {
Linus Torvalds's avatar
Linus Torvalds committed
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
		int orig_headroom = skb_headroom(skb);
		unsigned short veth_TCI;

		/* This is not a VLAN frame...but we can fix that! */
		VLAN_DEV_INFO(dev)->cnt_encap_on_xmit++;

#ifdef VLAN_DEBUG
		printk(VLAN_DBG "%s: proto to encap: 0x%hx (hbo)\n",
			__FUNCTION__, htons(veth->h_vlan_proto));
#endif
		/* Construct the second two bytes. This field looks something
		 * like:
		 * usr_priority: 3 bits	 (high bits)
		 * CFI		 1 bit
		 * VLAN ID	 12 bits (low bits)
		 */
		veth_TCI = VLAN_DEV_INFO(dev)->vlan_id;
		veth_TCI |= vlan_dev_get_egress_qos_mask(dev, skb);

		skb = __vlan_put_tag(skb, veth_TCI);
		if (!skb) {
			stats->tx_dropped++;
			return 0;
		}

		if (orig_headroom < VLAN_HLEN) {
			VLAN_DEV_INFO(dev)->cnt_inc_headroom_on_tx++;
		}
	}

#ifdef VLAN_DEBUG
	printk(VLAN_DBG "%s: about to send skb: %p to dev: %s\n",
		__FUNCTION__, skb, skb->dev->name);
	printk(VLAN_DBG "  %2hx.%2hx.%2hx.%2xh.%2hx.%2hx %2hx.%2hx.%2hx.%2hx.%2hx.%2hx %4hx %4hx %4hx\n",
	       veth->h_dest[0], veth->h_dest[1], veth->h_dest[2], veth->h_dest[3], veth->h_dest[4], veth->h_dest[5],
	       veth->h_source[0], veth->h_source[1], veth->h_source[2], veth->h_source[3], veth->h_source[4], veth->h_source[5],
	       veth->h_vlan_proto, veth->h_vlan_TCI, veth->h_vlan_encapsulated_proto);
#endif

	stats->tx_packets++; /* for statics only */
	stats->tx_bytes += skb->len;

	skb->dev = VLAN_DEV_INFO(dev)->real_dev;
	dev_queue_xmit(skb);

	return 0;
}

int vlan_dev_hwaccel_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct net_device_stats *stats = vlan_dev_get_stats(dev);
	unsigned short veth_TCI;

	/* Construct the second two bytes. This field looks something
	 * like:
	 * usr_priority: 3 bits	 (high bits)
	 * CFI		 1 bit
	 * VLAN ID	 12 bits (low bits)
	 */
	veth_TCI = VLAN_DEV_INFO(dev)->vlan_id;
	veth_TCI |= vlan_dev_get_egress_qos_mask(dev, skb);
	skb = __vlan_hwaccel_put_tag(skb, veth_TCI);

	stats->tx_packets++;
	stats->tx_bytes += skb->len;

	skb->dev = VLAN_DEV_INFO(dev)->real_dev;
	dev_queue_xmit(skb);

	return 0;
}

int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
{
	/* TODO: gotta make sure the underlying layer can handle it,
	 * maybe an IFF_VLAN_CAPABLE flag for devices?
	 */
	if (VLAN_DEV_INFO(dev)->real_dev->mtu < new_mtu)
		return -ERANGE;

	dev->mtu = new_mtu;

	return 0;
}

548
549
void vlan_dev_set_ingress_priority(const struct net_device *dev,
				   u32 skb_prio, short vlan_prio)
Linus Torvalds's avatar
Linus Torvalds committed
550
{
551
552
553
554
555
556
557
558
	struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev);

	if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
		vlan->nr_ingress_mappings--;
	else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
		vlan->nr_ingress_mappings++;

	vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
Linus Torvalds's avatar
Linus Torvalds committed
559
560
}

561
562
int vlan_dev_set_egress_priority(const struct net_device *dev,
				 u32 skb_prio, short vlan_prio)
Linus Torvalds's avatar
Linus Torvalds committed
563
{
564
	struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev);
Linus Torvalds's avatar
Linus Torvalds committed
565
566
	struct vlan_priority_tci_mapping *mp = NULL;
	struct vlan_priority_tci_mapping *np;
567
	u32 vlan_qos = (vlan_prio << 13) & 0xE000;
568

569
	/* See if a priority mapping exists.. */
570
	mp = vlan->egress_priority_map[skb_prio & 0xF];
571
572
	while (mp) {
		if (mp->priority == skb_prio) {
573
574
575
576
577
			if (mp->vlan_qos && !vlan_qos)
				vlan->nr_egress_mappings--;
			else if (!mp->vlan_qos && vlan_qos)
				vlan->nr_egress_mappings++;
			mp->vlan_qos = vlan_qos;
578
			return 0;
Linus Torvalds's avatar
Linus Torvalds committed
579
		}
580
		mp = mp->next;
Linus Torvalds's avatar
Linus Torvalds committed
581
	}
582
583

	/* Create a new mapping then. */
584
	mp = vlan->egress_priority_map[skb_prio & 0xF];
585
586
587
588
589
590
	np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
	if (!np)
		return -ENOBUFS;

	np->next = mp;
	np->priority = skb_prio;
591
592
593
594
	np->vlan_qos = vlan_qos;
	vlan->egress_priority_map[skb_prio & 0xF] = np;
	if (vlan_qos)
		vlan->nr_egress_mappings++;
595
	return 0;
Linus Torvalds's avatar
Linus Torvalds committed
596
597
}

598
/* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
599
600
int vlan_dev_set_vlan_flag(const struct net_device *dev,
			   u32 flag, short flag_val)
Linus Torvalds's avatar
Linus Torvalds committed
601
{
602
	/* verify flag is supported */
603
	if (flag == VLAN_FLAG_REORDER_HDR) {
604
		if (flag_val) {
605
			VLAN_DEV_INFO(dev)->flags |= VLAN_FLAG_REORDER_HDR;
Linus Torvalds's avatar
Linus Torvalds committed
606
		} else {
607
			VLAN_DEV_INFO(dev)->flags &= ~VLAN_FLAG_REORDER_HDR;
Linus Torvalds's avatar
Linus Torvalds committed
608
		}
609
		return 0;
Linus Torvalds's avatar
Linus Torvalds committed
610
	}
611
	printk(KERN_ERR "%s: flag %i is not valid.\n", __FUNCTION__, flag);
Linus Torvalds's avatar
Linus Torvalds committed
612
613
614
	return -EINVAL;
}

615
void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
Linus Torvalds's avatar
Linus Torvalds committed
616
{
617
	strncpy(result, VLAN_DEV_INFO(dev)->real_dev->name, 23);
Linus Torvalds's avatar
Linus Torvalds committed
618
619
}

620
void vlan_dev_get_vid(const struct net_device *dev, unsigned short *result)
Linus Torvalds's avatar
Linus Torvalds committed
621
{
622
	*result = VLAN_DEV_INFO(dev)->vlan_id;
Linus Torvalds's avatar
Linus Torvalds committed
623
624
625
626
}

int vlan_dev_open(struct net_device *dev)
{
627
628
629
630
631
	struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev);
	struct net_device *real_dev = vlan->real_dev;
	int err;

	if (!(real_dev->flags & IFF_UP))
Linus Torvalds's avatar
Linus Torvalds committed
632
633
		return -ENETDOWN;

634
635
636
637
638
639
640
	if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) {
		err = dev_unicast_add(real_dev, dev->dev_addr, ETH_ALEN);
		if (err < 0)
			return err;
	}
	memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN);

641
642
643
644
645
	if (dev->flags & IFF_ALLMULTI)
		dev_set_allmulti(real_dev, 1);
	if (dev->flags & IFF_PROMISC)
		dev_set_promiscuity(real_dev, 1);

Linus Torvalds's avatar
Linus Torvalds committed
646
647
648
649
650
	return 0;
}

int vlan_dev_stop(struct net_device *dev)
{
651
652
	struct net_device *real_dev = VLAN_DEV_INFO(dev)->real_dev;

653
	dev_mc_unsync(real_dev, dev);
654
655
656
657
658
	if (dev->flags & IFF_ALLMULTI)
		dev_set_allmulti(real_dev, -1);
	if (dev->flags & IFF_PROMISC)
		dev_set_promiscuity(real_dev, -1);

659
660
661
	if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
		dev_unicast_delete(real_dev, dev->dev_addr, dev->addr_len);

Linus Torvalds's avatar
Linus Torvalds committed
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
	return 0;
}

int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
	struct net_device *real_dev = VLAN_DEV_INFO(dev)->real_dev;
	struct ifreq ifrr;
	int err = -EOPNOTSUPP;

	strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
	ifrr.ifr_ifru = ifr->ifr_ifru;

	switch(cmd) {
	case SIOCGMIIPHY:
	case SIOCGMIIREG:
	case SIOCSMIIREG:
678
		if (real_dev->do_ioctl && netif_device_present(real_dev))
Linus Torvalds's avatar
Linus Torvalds committed
679
680
681
682
			err = real_dev->do_ioctl(real_dev, &ifrr, cmd);
		break;
	}

683
	if (!err)
Linus Torvalds's avatar
Linus Torvalds committed
684
685
686
687
688
		ifr->ifr_ifru = ifrr.ifr_ifru;

	return err;
}

689
690
691
692
693
694
695
696
697
698
void vlan_change_rx_flags(struct net_device *dev, int change)
{
	struct net_device *real_dev = VLAN_DEV_INFO(dev)->real_dev;

	if (change & IFF_ALLMULTI)
		dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
	if (change & IFF_PROMISC)
		dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
}

Linus Torvalds's avatar
Linus Torvalds committed
699
700
701
/** Taken from Gleb + Lennert's VLAN code, and modified... */
void vlan_dev_set_multicast_list(struct net_device *vlan_dev)
{
702
	dev_mc_sync(VLAN_DEV_INFO(vlan_dev)->real_dev, vlan_dev);
Linus Torvalds's avatar
Linus Torvalds committed
703
}