summaryrefslogtreecommitdiff
path: root/sys/net/if_vlan.c
blob: ae2af7dc60c941e97e176b7e731d9e27d13c8fa4 (plain)
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
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
/*	$OpenBSD: if_vlan.c,v 1.101 2013/11/08 09:18:27 mpi Exp $	*/

/*
 * Copyright 1998 Massachusetts Institute of Technology
 *
 * Permission to use, copy, modify, and distribute this software and
 * its documentation for any purpose and without fee is hereby
 * granted, provided that both the above copyright notice and this
 * permission notice appear in all copies, that both the above
 * copyright notice and this permission notice appear in all
 * supporting documentation, and that the name of M.I.T. not be used
 * in advertising or publicity pertaining to distribution of the
 * software without specific, written prior permission.  M.I.T. makes
 * no representations about the suitability of this software for any
 * purpose.  It is provided "as is" without express or implied
 * warranty.
 * 
 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $FreeBSD: src/sys/net/if_vlan.c,v 1.16 2000/03/26 15:21:40 charnier Exp $
 */

/*
 * if_vlan.c - pseudo-device driver for IEEE 802.1Q virtual LANs.
 * This is sort of sneaky in the implementation, since
 * we need to pretend to be enough of an Ethernet implementation
 * to make arp work.  The way we do this is by telling everyone
 * that we are an Ethernet, and then catch the packets that
 * ether_output() left on our output queue when it calls
 * if_start(), rewrite them for use by the real outgoing interface,
 * and ask it to send them.
 *
 * Some devices support 802.1Q tag insertion in firmware.  The
 * vlan interface behavior changes when the IFCAP_VLAN_HWTAGGING
 * capability is set on the parent.  In this case, vlan_start()
 * will not modify the ethernet header.
 */

#include "vlan.h"

#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/systm.h>

#include "bpfilter.h"
#if NBPFILTER > 0
#include <net/bpf.h>
#endif

#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_types.h>

#ifdef INET
#include <netinet/in.h>
#include <netinet/if_ether.h>
#endif

#include <net/if_vlan_var.h>

u_long vlan_tagmask, svlan_tagmask;

#define TAG_HASH_SIZE		32
#define TAG_HASH(tag)		(tag & vlan_tagmask)
LIST_HEAD(vlan_taghash, ifvlan)	*vlan_tagh, *svlan_tagh;

void	vlan_start(struct ifnet *ifp);
int	vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr);
int	vlan_unconfig(struct ifnet *ifp, struct ifnet *newp);
int	vlan_config(struct ifvlan *, struct ifnet *, u_int16_t);
void	vlan_vlandev_state(void *);
void	vlanattach(int count);
int	vlan_set_promisc(struct ifnet *ifp);
int	vlan_ether_addmulti(struct ifvlan *, struct ifreq *);
int	vlan_ether_delmulti(struct ifvlan *, struct ifreq *);
void	vlan_ether_purgemulti(struct ifvlan *);
void	vlan_ether_resetmulti(struct ifvlan *, struct ifnet *);
int	vlan_clone_create(struct if_clone *, int);
int	vlan_clone_destroy(struct ifnet *);
void	vlan_ifdetach(void *);

struct if_clone vlan_cloner =
    IF_CLONE_INITIALIZER("vlan", vlan_clone_create, vlan_clone_destroy);
struct if_clone svlan_cloner =
    IF_CLONE_INITIALIZER("svlan", vlan_clone_create, vlan_clone_destroy);

/* ARGSUSED */
void
vlanattach(int count)
{
	/* Normal VLAN */
	vlan_tagh = hashinit(TAG_HASH_SIZE, M_DEVBUF, M_NOWAIT,
	    &vlan_tagmask);
	if (vlan_tagh == NULL)
		panic("vlanattach: hashinit");
	if_clone_attach(&vlan_cloner);

	/* Service-VLAN for QinQ/802.1ad provider bridges */
	svlan_tagh = hashinit(TAG_HASH_SIZE, M_DEVBUF, M_NOWAIT,
	    &svlan_tagmask);
	if (svlan_tagh == NULL)
		panic("vlanattach: hashinit");
	if_clone_attach(&svlan_cloner);
}

int
vlan_clone_create(struct if_clone *ifc, int unit)
{
	struct ifvlan *ifv;
	struct ifnet *ifp;

	ifv = malloc(sizeof(*ifv), M_DEVBUF, M_NOWAIT|M_ZERO);
	if (!ifv)
		return (ENOMEM);

	LIST_INIT(&ifv->vlan_mc_listhead);
	ifp = &ifv->ifv_if;
	ifp->if_softc = ifv;
	snprintf(ifp->if_xname, sizeof ifp->if_xname, "%s%d", ifc->ifc_name,
	    unit);
	/* NB: flags are not set here */
	/* NB: mtu is not set here */

	/* Special handling for the IEEE 802.1ad QinQ variant */
	if (strcmp("svlan", ifc->ifc_name) == 0)
		ifv->ifv_type = ETHERTYPE_QINQ;
	else
		ifv->ifv_type = ETHERTYPE_VLAN;

	ifp->if_start = vlan_start;
	ifp->if_ioctl = vlan_ioctl;
	IFQ_SET_MAXLEN(&ifp->if_snd, 1);
	IFQ_SET_READY(&ifp->if_snd);
	if_attach(ifp);
	ether_ifattach(ifp);
	/* Now undo some of the damage... */
	ifp->if_type = IFT_L2VLAN;
	ifp->if_hdrlen = EVL_ENCAPLEN;

	return (0);
}

int
vlan_clone_destroy(struct ifnet *ifp)
{
	struct ifvlan *ifv = ifp->if_softc;

	vlan_unconfig(ifp, NULL);
	ether_ifdetach(ifp);
	if_detach(ifp);

	free(ifv, M_DEVBUF);
	return (0);
}

void
vlan_ifdetach(void *ptr)
{
	struct ifvlan *ifv = (struct ifvlan *)ptr;

	vlan_clone_destroy(&ifv->ifv_if);
}

void
vlan_start(struct ifnet *ifp)
{
	struct ifvlan *ifv;
	struct ifnet *p;
	struct mbuf *m;
	int error;

	ifv = ifp->if_softc;
	p = ifv->ifv_p;

	for (;;) {
		IFQ_DEQUEUE(&ifp->if_snd, m);
		if (m == NULL)
			break;

		if ((p->if_flags & (IFF_UP|IFF_RUNNING)) !=
		    (IFF_UP|IFF_RUNNING)) {
			IF_DROP(&p->if_snd);
				/* XXX stats */
			ifp->if_oerrors++;
			m_freem(m);
			continue;
		}

#if NBPFILTER > 0
		if (ifp->if_bpf)
			bpf_mtap(ifp->if_bpf, m, BPF_DIRECTION_OUT);
#endif

		/*
		 * If the IFCAP_VLAN_HWTAGGING capability is set on the parent,
		 * it can do VLAN tag insertion itself and doesn't require us
	 	 * to create a special header for it. In this case, we just pass
		 * the packet along.
		 */
		if ((p->if_capabilities & IFCAP_VLAN_HWTAGGING) &&
		    (ifv->ifv_type == ETHERTYPE_VLAN)) {
			m->m_pkthdr.ether_vtag = ifv->ifv_tag +
			    (m->m_pkthdr.pf.prio << EVL_PRIO_BITS);
			m->m_flags |= M_VLANTAG;
		} else {
			struct ether_vlan_header evh;

			m_copydata(m, 0, ETHER_HDR_LEN, (caddr_t)&evh);
			evh.evl_proto = evh.evl_encap_proto;
			evh.evl_encap_proto = htons(ifv->ifv_type);
			evh.evl_tag = htons(ifv->ifv_tag +
			    (m->m_pkthdr.pf.prio << EVL_PRIO_BITS));

			m_adj(m, ETHER_HDR_LEN);
			M_PREPEND(m, sizeof(evh), M_DONTWAIT);
			if (m == NULL) {
				ifp->if_oerrors++;
				continue;
			}

			m_copyback(m, 0, sizeof(evh), &evh, M_NOWAIT);
		}

		/*
		 * Send it, precisely as ether_output() would have.
		 * We are already running at splnet.
		 */
		IFQ_ENQUEUE(&p->if_snd, m, NULL, error);
		if (error) {
			/* mbuf is already freed */
			ifp->if_oerrors++;
			continue;
		}
		p->if_obytes += m->m_pkthdr.len;
		if (m->m_flags & M_MCAST)
			p->if_omcasts++;

		ifp->if_opackets++;
		if_start(p);
	}

	return;
}

/*
 * vlan_input() returns 0 if it has consumed the packet, 1 otherwise.
 */
int
vlan_input(struct ether_header *eh, struct mbuf *m)
{
	struct ifvlan *ifv;
	struct ifnet *ifp = m->m_pkthdr.rcvif;
	struct vlan_taghash *tagh;
	u_int tag;
	u_int16_t etype;

	if (m->m_flags & M_VLANTAG) {
		etype = ETHERTYPE_VLAN;
		tagh = vlan_tagh;
	} else {
		if (m->m_len < EVL_ENCAPLEN &&
		    (m = m_pullup(m, EVL_ENCAPLEN)) == NULL) {
			ifp->if_ierrors++;
			return (0);
		}

		etype = ntohs(eh->ether_type);
		tagh = etype == ETHERTYPE_QINQ ? svlan_tagh : vlan_tagh;
		m->m_pkthdr.ether_vtag = ntohs(*mtod(m, u_int16_t *));
	}
	/* From now on ether_vtag is fine */
	tag = EVL_VLANOFTAG(m->m_pkthdr.ether_vtag);
	m->m_pkthdr.pf.prio = EVL_PRIOFTAG(m->m_pkthdr.ether_vtag);

	LIST_FOREACH(ifv, &tagh[TAG_HASH(tag)], ifv_list) {
		if (m->m_pkthdr.rcvif == ifv->ifv_p && tag == ifv->ifv_tag &&
		    etype == ifv->ifv_type)
			break;
	}
	if (ifv == NULL)
		return (1);

	if ((ifv->ifv_if.if_flags & (IFF_UP|IFF_RUNNING)) !=
	    (IFF_UP|IFF_RUNNING)) {
		m_freem(m);
		return (0);
	}

	/*
	 * Having found a valid vlan interface corresponding to
	 * the given source interface and vlan tag, remove the
	 * encapsulation, and run the real packet through
	 * ether_input() a second time (it had better be
	 * reentrant!).
	 */
	m->m_pkthdr.rcvif = &ifv->ifv_if;
	if (m->m_flags & M_VLANTAG) {
		m->m_flags &= ~M_VLANTAG;
	} else {
		eh->ether_type = mtod(m, u_int16_t *)[1];
		m->m_len -= EVL_ENCAPLEN;
		m->m_data += EVL_ENCAPLEN;
		m->m_pkthdr.len -= EVL_ENCAPLEN;
	}

#if NBPFILTER > 0
	if (ifv->ifv_if.if_bpf)
		bpf_mtap_hdr(ifv->ifv_if.if_bpf, (char *)eh, ETHER_HDR_LEN,
		    m, BPF_DIRECTION_IN);
#endif

	/*
	 * Drop promiscuously received packets if we are not in
	 * promiscuous mode.
	 */
	if ((m->m_flags & (M_BCAST|M_MCAST)) == 0 &&
	    (ifp->if_flags & IFF_PROMISC) &&
	    (ifv->ifv_if.if_flags & IFF_PROMISC) == 0) {
		struct arpcom *ac = &ifv->ifv_ac;
		if (bcmp(ac->ac_enaddr, eh->ether_dhost, ETHER_ADDR_LEN)) {
			m_freem(m);
			return (0);
		}
	}

	ifv->ifv_if.if_ipackets++;
	ether_input(&ifv->ifv_if, eh, m);

	return (0);
}

int
vlan_config(struct ifvlan *ifv, struct ifnet *p, u_int16_t tag)
{
	struct ifaddr *ifa1, *ifa2;
	struct sockaddr_dl *sdl1, *sdl2;
	struct vlan_taghash *tagh;
	u_int flags;
	int s;

	if (p->if_type != IFT_ETHER)
		return EPROTONOSUPPORT;
	if (ifv->ifv_p == p && ifv->ifv_tag == tag) /* noop */
		return (0);

	/* Remember existing interface flags and reset the interface */
	flags = ifv->ifv_flags;
	vlan_unconfig(&ifv->ifv_if, p);

	ifv->ifv_p = p;

	if (p->if_capabilities & IFCAP_VLAN_MTU)
		ifv->ifv_if.if_mtu = p->if_mtu;
	else {
		/*
		 * This will be incompatible with strict
		 * 802.1Q implementations
		 */
		ifv->ifv_if.if_mtu = p->if_mtu - EVL_ENCAPLEN;
#ifdef DIAGNOSTIC
		printf("%s: initialized with non-standard mtu %u (parent %s)\n",
		    ifv->ifv_if.if_xname, ifv->ifv_if.if_mtu,
		    ifv->ifv_p->if_xname);
#endif
	}

	ifv->ifv_if.if_flags = p->if_flags &
	    (IFF_UP | IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST);

	/* Reset promisc mode on the interface and its parent */
	if (flags & IFVF_PROMISC) {
		ifv->ifv_if.if_flags |= IFF_PROMISC;
		vlan_set_promisc(&ifv->ifv_if);
	}

	/*
	 * Inherit the if_type from the parent.  This allows us to
	 * participate in bridges of that type.
	 */
	ifv->ifv_if.if_type = p->if_type;

	/*
	 * Inherit baudrate from the parent.  An SNMP agent would use this
	 * information.
	 */
	ifv->ifv_if.if_baudrate = p->if_baudrate;

	/*
	 * If the parent interface can do hardware-assisted
	 * VLAN encapsulation, then propagate its hardware-
	 * assisted checksumming flags.
	 *
	 * If the card cannot handle hardware tagging, it cannot
	 * possibly compute the correct checksums for tagged packets.
	 *
	 * This brings up another possibility, do cards exist which
	 * have all of these capabilities but cannot utilize them together?
	 */
	if (p->if_capabilities & IFCAP_VLAN_HWTAGGING)
		ifv->ifv_if.if_capabilities = p->if_capabilities &
		    IFCAP_CSUM_MASK;

	/*
	 * Hardware VLAN tagging only works with the default VLAN
	 * ethernet type (0x8100).
	 */
	if (ifv->ifv_type != ETHERTYPE_VLAN)
		ifv->ifv_if.if_capabilities &= ~IFCAP_VLAN_HWTAGGING;

	/*
	 * Set up our ``Ethernet address'' to reflect the underlying
	 * physical interface's.
	 */
	ifa1 = ifv->ifv_if.if_lladdr;
	ifa2 = p->if_lladdr;
	sdl1 = (struct sockaddr_dl *)ifa1->ifa_addr;
	sdl2 = (struct sockaddr_dl *)ifa2->ifa_addr;
	sdl1->sdl_type = IFT_ETHER;
	sdl1->sdl_alen = ETHER_ADDR_LEN;
	bcopy(LLADDR(sdl2), LLADDR(sdl1), ETHER_ADDR_LEN);
	bcopy(LLADDR(sdl2), ifv->ifv_ac.ac_enaddr, ETHER_ADDR_LEN);

	ifv->ifv_tag = tag;
	s = splnet();
	tagh = ifv->ifv_type == ETHERTYPE_QINQ ? svlan_tagh : vlan_tagh;
	LIST_INSERT_HEAD(&tagh[TAG_HASH(tag)], ifv, ifv_list);

	/* Register callback for physical link state changes */
	ifv->lh_cookie = hook_establish(p->if_linkstatehooks, 1,
	    vlan_vlandev_state, ifv);

	/* Register callback if parent wants to unregister */
	ifv->dh_cookie = hook_establish(p->if_detachhooks, 0,
	    vlan_ifdetach, ifv);

	vlan_vlandev_state(ifv);
	splx(s);

	return 0;
}

int
vlan_unconfig(struct ifnet *ifp, struct ifnet *newp)
{
	struct ifaddr *ifa;
	struct sockaddr_dl *sdl;
	struct ifvlan *ifv;
	struct ifnet *p;
	int s;

	ifv = ifp->if_softc;
	p = ifv->ifv_p;
	if (p == NULL)
		return 0;

	/* Unset promisc mode on the interface and its parent */
	if (ifv->ifv_flags & IFVF_PROMISC) {
		ifp->if_flags &= ~IFF_PROMISC;
		vlan_set_promisc(ifp);
	}

	s = splnet();
	LIST_REMOVE(ifv, ifv_list);
	splx(s);

	hook_disestablish(p->if_linkstatehooks, ifv->lh_cookie);
	hook_disestablish(p->if_detachhooks, ifv->dh_cookie);
	/* Reset link state */
	if (newp != NULL) {
		ifp->if_link_state = LINK_STATE_INVALID;
		if_link_state_change(ifp);
	}

	/*
 	 * Since the interface is being unconfigured, we need to
	 * empty the list of multicast groups that we may have joined
	 * while we were alive and remove them from the parent's list
	 * as well.
	 */
	vlan_ether_resetmulti(ifv, newp);

	/* Disconnect from parent. */
	ifv->ifv_p = NULL;
	ifv->ifv_if.if_mtu = ETHERMTU;
	ifv->ifv_flags = 0;

	/* Clear our MAC address. */
	ifa = ifv->ifv_if.if_lladdr;
	sdl = (struct sockaddr_dl *)ifa->ifa_addr;
	sdl->sdl_type = IFT_ETHER;
	sdl->sdl_alen = ETHER_ADDR_LEN;
	bzero(LLADDR(sdl), ETHER_ADDR_LEN);
	bzero(ifv->ifv_ac.ac_enaddr, ETHER_ADDR_LEN);

	return 0;
}

void
vlan_vlandev_state(void *v)
{
	struct ifvlan *ifv = v;

	if (ifv->ifv_if.if_link_state == ifv->ifv_p->if_link_state)
		return;

	ifv->ifv_if.if_link_state = ifv->ifv_p->if_link_state;
	ifv->ifv_if.if_baudrate = ifv->ifv_p->if_baudrate;
	if_link_state_change(&ifv->ifv_if);
}

int
vlan_set_promisc(struct ifnet *ifp)
{
	struct ifvlan *ifv = ifp->if_softc;
	int error = 0;

	if ((ifp->if_flags & IFF_PROMISC) != 0) {
		if ((ifv->ifv_flags & IFVF_PROMISC) == 0) {
			error = ifpromisc(ifv->ifv_p, 1);
			if (error == 0)
				ifv->ifv_flags |= IFVF_PROMISC;
		}
	} else {
		if ((ifv->ifv_flags & IFVF_PROMISC) != 0) {
			error = ifpromisc(ifv->ifv_p, 0);
			if (error == 0)
				ifv->ifv_flags &= ~IFVF_PROMISC;
		}
	}

	return (0);
}

int
vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
	struct proc *p = curproc;	/* XXX */
	struct ifaddr *ifa;
	struct ifnet *pr;
	struct ifreq *ifr;
	struct ifvlan *ifv;
	struct vlanreq vlr;
	int error = 0, p_mtu = 0, s;

	ifr = (struct ifreq *)data;
	ifa = (struct ifaddr *)data;
	ifv = ifp->if_softc;

	switch (cmd) {
	case SIOCSIFADDR:
		if (ifv->ifv_p != NULL) {
			ifp->if_flags |= IFF_UP;

			switch (ifa->ifa_addr->sa_family) {
#ifdef INET
			case AF_INET:
				arp_ifinit(&ifv->ifv_ac, ifa);
				break;
#endif
			default:
				break;
			}
		} else {
			error = EINVAL;
		}
		break;

	case SIOCGIFADDR:
		{
			struct sockaddr *sa;

			sa = (struct sockaddr *) &ifr->ifr_data;
			bcopy(((struct arpcom *)ifp->if_softc)->ac_enaddr,
			    (caddr_t) sa->sa_data, ETHER_ADDR_LEN);
		}
		break;

	case SIOCSIFMTU:
		if (ifv->ifv_p != NULL) {
			if (ifv->ifv_p->if_capabilities & IFCAP_VLAN_MTU)
				p_mtu = ifv->ifv_p->if_mtu;
			else
				p_mtu = ifv->ifv_p->if_mtu - EVL_ENCAPLEN;
			
			if (ifr->ifr_mtu > p_mtu || ifr->ifr_mtu < ETHERMIN)
				error = EINVAL;
			else
				ifp->if_mtu = ifr->ifr_mtu;
		} else
			error = EINVAL;

		break;

	case SIOCSETVLAN:
		if ((error = suser(p, 0)) != 0)
			break;
		if ((error = copyin(ifr->ifr_data, &vlr, sizeof vlr)))
			break;
		if (vlr.vlr_parent[0] == '\0') {
			s = splnet();
			vlan_unconfig(ifp, NULL);
			if (ifp->if_flags & IFF_UP)
				if_down(ifp);
			ifp->if_flags &= ~IFF_RUNNING;
			splx(s);
			break;
		}
		pr = ifunit(vlr.vlr_parent);
		if (pr == NULL) {
			error = ENOENT;
			break;
		}
		/*
		 * Don't let the caller set up a VLAN tag with
		 * anything except VLID bits.
		 */
		if (vlr.vlr_tag & ~EVL_VLID_MASK) {
			error = EINVAL;
			break;
		}
		error = vlan_config(ifv, pr, vlr.vlr_tag);
		if (error)
			break;
		ifp->if_flags |= IFF_RUNNING;

		/* Update promiscuous mode, if necessary. */
		vlan_set_promisc(ifp);
		break;
		
	case SIOCGETVLAN:
		bzero(&vlr, sizeof vlr);
		if (ifv->ifv_p) {
			snprintf(vlr.vlr_parent, sizeof(vlr.vlr_parent),
			    "%s", ifv->ifv_p->if_xname);
			vlr.vlr_tag = ifv->ifv_tag;
		}
		error = copyout(&vlr, ifr->ifr_data, sizeof vlr);
		break;
	case SIOCSIFFLAGS:
		/*
		 * For promiscuous mode, we enable promiscuous mode on
		 * the parent if we need promiscuous on the VLAN interface.
		 */
		if (ifv->ifv_p != NULL)
			error = vlan_set_promisc(ifp);
		break;

	case SIOCADDMULTI:
		error = (ifv->ifv_p != NULL) ?
		    vlan_ether_addmulti(ifv, ifr) : EINVAL;
		break;

	case SIOCDELMULTI:
		error = (ifv->ifv_p != NULL) ?
		    vlan_ether_delmulti(ifv, ifr) : EINVAL;
		break;
	default:
		error = ENOTTY;
	}
	return error;
}


int
vlan_ether_addmulti(struct ifvlan *ifv, struct ifreq *ifr)
{
	struct ifnet *ifp = ifv->ifv_p;		/* Parent. */
	struct vlan_mc_entry *mc;
	u_int8_t addrlo[ETHER_ADDR_LEN], addrhi[ETHER_ADDR_LEN];
	int error;

	/* XXX: sa_len is too small for such comparison
	if (ifr->ifr_addr.sa_len > sizeof(struct sockaddr_storage))
		return (EINVAL);
	*/

	error = ether_addmulti(ifr, (struct arpcom *)&ifv->ifv_ac);
	if (error != ENETRESET)
		return (error);

	/*
	 * This is new multicast address.  We have to tell parent
	 * about it.  Also, remember this multicast address so that
	 * we can delete them on unconfigure.
	 */
	mc = malloc(sizeof(*mc), M_DEVBUF, M_NOWAIT);
	if (mc == NULL) {
		error = ENOMEM;
		goto alloc_failed;
	}

	/*
	 * As ether_addmulti() returns ENETRESET, following two
	 * statement shouldn't fail.
	 */
	(void)ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi);
	ETHER_LOOKUP_MULTI(addrlo, addrhi, &ifv->ifv_ac, mc->mc_enm);
	memcpy(&mc->mc_addr, &ifr->ifr_addr, ifr->ifr_addr.sa_len);
	LIST_INSERT_HEAD(&ifv->vlan_mc_listhead, mc, mc_entries);

	error = (*ifp->if_ioctl)(ifp, SIOCADDMULTI, (caddr_t)ifr);
	if (error != 0)
		goto ioctl_failed;

	return (error);

 ioctl_failed:
	LIST_REMOVE(mc, mc_entries);
	free(mc, M_DEVBUF);
 alloc_failed:
	(void)ether_delmulti(ifr, (struct arpcom *)&ifv->ifv_ac);

	return (error);
}

int
vlan_ether_delmulti(struct ifvlan *ifv, struct ifreq *ifr)
{
	struct ifnet *ifp = ifv->ifv_p;		/* Parent. */
	struct ether_multi *enm;
	struct vlan_mc_entry *mc;
	u_int8_t addrlo[ETHER_ADDR_LEN], addrhi[ETHER_ADDR_LEN];
	int error;

	/*
	 * Find a key to lookup vlan_mc_entry.  We have to do this
	 * before calling ether_delmulti for obvious reason.
	 */
	if ((error = ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi)) != 0)
		return (error);
	ETHER_LOOKUP_MULTI(addrlo, addrhi, &ifv->ifv_ac, enm);
	if (enm == NULL)
		return (EINVAL);

	LIST_FOREACH(mc, &ifv->vlan_mc_listhead, mc_entries)
		if (mc->mc_enm == enm)
			break;

	/* We won't delete entries we didn't add */
	if (mc == NULL)
		return (EINVAL);

	error = ether_delmulti(ifr, (struct arpcom *)&ifv->ifv_ac);
	if (error != ENETRESET)
		return (error);

	/* We no longer use this multicast address.  Tell parent so. */
	error = (*ifp->if_ioctl)(ifp, SIOCDELMULTI, (caddr_t)ifr);
	if (error == 0) {
		/* And forget about this address. */
		LIST_REMOVE(mc, mc_entries);
		free(mc, M_DEVBUF);
	} else
		(void)ether_addmulti(ifr, (struct arpcom *)&ifv->ifv_ac);
	return (error);
}

/*
 * Delete any multicast address we have asked to add from parent
 * interface.  Called when the vlan is being unconfigured.
 */
void
vlan_ether_purgemulti(struct ifvlan *ifv)
{
	struct ifnet *ifp = ifv->ifv_p;		/* Parent. */
	struct vlan_mc_entry *mc;
	union {
		struct ifreq ifreq;
		struct {
			char ifr_name[IFNAMSIZ];
			struct sockaddr_storage ifr_ss;
		} ifreq_storage;
	} ifreq;
	struct ifreq *ifr = &ifreq.ifreq;

	memcpy(ifr->ifr_name, ifp->if_xname, IFNAMSIZ);
	while ((mc = LIST_FIRST(&ifv->vlan_mc_listhead)) != NULL) {
		memcpy(&ifr->ifr_addr, &mc->mc_addr, mc->mc_addr.ss_len);
		(void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, (caddr_t)ifr);
		LIST_REMOVE(mc, mc_entries);
		free(mc, M_DEVBUF);
	}
}

void
vlan_ether_resetmulti(struct ifvlan *ifv, struct ifnet *p)
{
	struct ifnet *ifp = ifv->ifv_p;		/* Parent. */
	struct vlan_mc_entry *mc;
	union {
		struct ifreq ifreq;
		struct {
			char ifr_name[IFNAMSIZ];
			struct sockaddr_storage ifr_ss;
		} ifreq_storage;
	} ifreq;
	struct ifreq *ifr = &ifreq.ifreq;

	if (p == NULL) {
		vlan_ether_purgemulti(ifv);
		return;
	} else if (ifp == p)
		return;

	LIST_FOREACH(mc, &ifv->vlan_mc_listhead, mc_entries) {
		memcpy(&ifr->ifr_addr, &mc->mc_addr, mc->mc_addr.ss_len);
	
		/* Remove from the old parent */
		memcpy(ifr->ifr_name, ifp->if_xname, IFNAMSIZ);
		(void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, (caddr_t)ifr);

		/* Try to add to the new parent */
		memcpy(ifr->ifr_name, p->if_xname, IFNAMSIZ);
		(void)(*p->if_ioctl)(p, SIOCADDMULTI, (caddr_t)ifr);
	}
}