summaryrefslogtreecommitdiffstats
path: root/sys/net80211/ieee80211_wds.c
blob: 05268e81d71a969701951665727ebcdfeaa9eac6 (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
/*-
 * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR 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.
 */

#include <sys/cdefs.h>
#ifdef __FreeBSD__
__FBSDID("$FreeBSD$");
#endif

/*
 * IEEE 802.11 WDS mode support.
 */
#include "opt_inet.h"
#include "opt_wlan.h"

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

#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/endian.h>
#include <sys/errno.h>
#include <sys/proc.h>
#include <sys/sysctl.h>

#include <net/if.h>
#include <net/if_var.h>
#include <net/if_media.h>
#include <net/if_llc.h>
#include <net/ethernet.h>

#include <net/bpf.h>

#include <net80211/ieee80211_var.h>
#include <net80211/ieee80211_wds.h>
#include <net80211/ieee80211_input.h>
#ifdef IEEE80211_SUPPORT_SUPERG
#include <net80211/ieee80211_superg.h>
#endif

static void wds_vattach(struct ieee80211vap *);
static int wds_newstate(struct ieee80211vap *, enum ieee80211_state, int);
static	int wds_input(struct ieee80211_node *ni, struct mbuf *m,
	    const struct ieee80211_rx_stats *rxs, int, int);
static void wds_recv_mgmt(struct ieee80211_node *, struct mbuf *, int subtype,
	const struct ieee80211_rx_stats *, int, int);

void
ieee80211_wds_attach(struct ieee80211com *ic)
{
	ic->ic_vattach[IEEE80211_M_WDS] = wds_vattach;
}

void
ieee80211_wds_detach(struct ieee80211com *ic)
{
}

static void
wds_vdetach(struct ieee80211vap *vap)
{
	if (vap->iv_bss != NULL) {
		/* XXX locking? */
		if (vap->iv_bss->ni_wdsvap == vap)
			vap->iv_bss->ni_wdsvap = NULL;
	}
}

static void
wds_vattach(struct ieee80211vap *vap)
{
	vap->iv_newstate = wds_newstate;
	vap->iv_input = wds_input;
	vap->iv_recv_mgmt = wds_recv_mgmt;
	vap->iv_opdetach = wds_vdetach;
}

static void
wds_flush(struct ieee80211_node *ni)
{
	struct ieee80211com *ic = ni->ni_ic;
	struct mbuf *m, *next;
	int8_t rssi, nf;

	m = ieee80211_ageq_remove(&ic->ic_stageq,
	    (void *)(uintptr_t) ieee80211_mac_hash(ic, ni->ni_macaddr));
	if (m == NULL)
		return;

	IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_WDS, ni,
	    "%s", "flush wds queue");
	ic->ic_node_getsignal(ni, &rssi, &nf);
	for (; m != NULL; m = next) {
		next = m->m_nextpkt;
		m->m_nextpkt = NULL;
		ieee80211_input(ni, m, rssi, nf);
	}
}

static int
ieee80211_create_wds(struct ieee80211vap *vap, struct ieee80211_channel *chan)
{
	struct ieee80211com *ic = vap->iv_ic;
	struct ieee80211_node_table *nt = &ic->ic_sta;
	struct ieee80211_node *ni, *obss;

	IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS,
	     "%s: creating link to %s on channel %u\n", __func__,
	     ether_sprintf(vap->iv_des_bssid), ieee80211_chan2ieee(ic, chan));

	/* NB: vap create must specify the bssid for the link */
	KASSERT(vap->iv_flags & IEEE80211_F_DESBSSID, ("no bssid"));
	/* NB: we should only be called on RUN transition */
	KASSERT(vap->iv_state == IEEE80211_S_RUN, ("!RUN state"));

	if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) {
		/*
		 * Dynamic/non-legacy WDS.  Reference the associated
		 * station specified by the desired bssid setup at vap
		 * create.  Point ni_wdsvap at the WDS vap so 4-address
		 * frames received through the associated AP vap will
		 * be dispatched upward (e.g. to a bridge) as though
		 * they arrived on the WDS vap.
		 */
		IEEE80211_NODE_LOCK(nt);
		obss = NULL;
		ni = ieee80211_find_node_locked(&ic->ic_sta, vap->iv_des_bssid);
		if (ni == NULL) {
			/*
			 * Node went away before we could hookup.  This
			 * should be ok; no traffic will flow and a leave
			 * event will be dispatched that should cause
			 * the vap to be destroyed.
			 */
			IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS,
			    "%s: station %s went away\n",
			    __func__, ether_sprintf(vap->iv_des_bssid));
			/* XXX stat? */
		} else if (ni->ni_wdsvap != NULL) {
			/*
			 * Node already setup with a WDS vap; we cannot
			 * allow multiple references so disallow.  If
			 * ni_wdsvap points at us that's ok; we should
			 * do nothing anyway.
			 */
			/* XXX printf instead? */
			IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS,
			    "%s: station %s in use with %s\n",
			    __func__, ether_sprintf(vap->iv_des_bssid),
			    ni->ni_wdsvap->iv_ifp->if_xname);
			/* XXX stat? */
		} else {
			/*
			 * Committed to new node, setup state.
			 */
			obss = vap->iv_bss;
			vap->iv_bss = ni;
			ni->ni_wdsvap = vap;
		}
		IEEE80211_NODE_UNLOCK(nt);
		if (obss != NULL) {
			/* NB: deferred to avoid recursive lock */
			ieee80211_free_node(obss);
		}
	} else {
		/*
		 * Legacy WDS vap setup.
		 */
		/*
		 * The far end does not associate so we just create
		 * create a new node and install it as the vap's
		 * bss node.  We must simulate an association and
		 * authorize the port for traffic to flow.
		 * XXX check if node already in sta table?
		 */
		ni = ieee80211_node_create_wds(vap, vap->iv_des_bssid, chan);
		if (ni != NULL) {
			obss = vap->iv_bss;
			vap->iv_bss = ieee80211_ref_node(ni);
			ni->ni_flags |= IEEE80211_NODE_AREF;
			if (obss != NULL)
				ieee80211_free_node(obss);
			/* give driver a chance to setup state like ni_txrate */
			if (ic->ic_newassoc != NULL)
				ic->ic_newassoc(ni, 1);
			/* tell the authenticator about new station */
			if (vap->iv_auth->ia_node_join != NULL)
				vap->iv_auth->ia_node_join(ni);
			if (ni->ni_authmode != IEEE80211_AUTH_8021X)
				ieee80211_node_authorize(ni);

			ieee80211_notify_node_join(ni, 1 /*newassoc*/);
			/* XXX inject l2uf frame */
		}
	}

	/*
	 * Flush any pending frames now that were setup.
	 */
	if (ni != NULL)
		wds_flush(ni);
	return (ni == NULL ? ENOENT : 0);
}

/*
 * Propagate multicast frames of an ap vap to all DWDS links.
 * The caller is assumed to have verified this frame is multicast.
 */
void
ieee80211_dwds_mcast(struct ieee80211vap *vap0, struct mbuf *m)
{
	struct ieee80211com *ic = vap0->iv_ic;
	const struct ether_header *eh = mtod(m, const struct ether_header *);
	struct ieee80211_node *ni;
	struct ieee80211vap *vap;
	struct ifnet *ifp;
	struct mbuf *mcopy;
	int err;

	KASSERT(ETHER_IS_MULTICAST(eh->ether_dhost),
	    ("%s not mcast", ether_sprintf(eh->ether_dhost)));

	/* XXX locking */
	TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
		/* only DWDS vaps are interesting */
		if (vap->iv_opmode != IEEE80211_M_WDS ||
		    (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY))
			continue;
		/* if it came in this interface, don't send it back out */
		ifp = vap->iv_ifp;
		if (ifp == m->m_pkthdr.rcvif)
			continue;
		/*
		 * Duplicate the frame and send it.
		 */
		mcopy = m_copypacket(m, M_NOWAIT);
		if (mcopy == NULL) {
			if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
			/* XXX stat + msg */
			continue;
		}
		ni = ieee80211_find_txnode(vap, eh->ether_dhost);
		if (ni == NULL) {
			/* NB: ieee80211_find_txnode does stat+msg */
			if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
			m_freem(mcopy);
			continue;
		}
		/* calculate priority so drivers can find the tx queue */
		if (ieee80211_classify(ni, mcopy)) {
			IEEE80211_DISCARD_MAC(vap,
			    IEEE80211_MSG_OUTPUT | IEEE80211_MSG_WDS,
			    eh->ether_dhost, NULL,
			    "%s", "classification failure");
			vap->iv_stats.is_tx_classify++;
			if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
			m_freem(mcopy);
			ieee80211_free_node(ni);
			continue;
		}

		BPF_MTAP(ifp, m);		/* 802.3 tx */

		/*
		 * Encapsulate the packet in prep for transmission.
		 */
		IEEE80211_TX_LOCK(ic);
		mcopy = ieee80211_encap(vap, ni, mcopy);
		if (mcopy == NULL) {
			/* NB: stat+msg handled in ieee80211_encap */
			IEEE80211_TX_UNLOCK(ic);
			ieee80211_free_node(ni);
			continue;
		}
		mcopy->m_flags |= M_MCAST;
		mcopy->m_pkthdr.rcvif = (void *) ni;

		err = ieee80211_parent_xmitpkt(ic, mcopy);
		IEEE80211_TX_UNLOCK(ic);
		if (!err) {
			if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
			if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1);
			if_inc_counter(ifp, IFCOUNTER_OBYTES,
			    m->m_pkthdr.len);
		}
	}
}

/*
 * Handle DWDS discovery on receipt of a 4-address frame in
 * ap mode.  Queue the frame and post an event for someone
 * to plumb the necessary WDS vap for this station.  Frames
 * received prior to the vap set running will then be reprocessed
 * as if they were just received.
 */
void
ieee80211_dwds_discover(struct ieee80211_node *ni, struct mbuf *m)
{
	struct ieee80211com *ic = ni->ni_ic;

	/*
	 * Save the frame with an aging interval 4 times
	 * the listen interval specified by the station. 
	 * Frames that sit around too long are reclaimed
	 * using this information.
	 * XXX handle overflow?
	 * XXX per/vap beacon interval?
	 */
	m->m_pkthdr.rcvif = (void *)(uintptr_t)
	    ieee80211_mac_hash(ic, ni->ni_macaddr);
	(void) ieee80211_ageq_append(&ic->ic_stageq, m,
	    ((ni->ni_intval * ic->ic_lintval) << 2) / 1024);
	ieee80211_notify_wds_discover(ni);
}

/*
 * IEEE80211_M_WDS vap state machine handler.
 */
static int
wds_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
{
	struct ieee80211com *ic = vap->iv_ic;
	enum ieee80211_state ostate;
	int error;

	IEEE80211_LOCK_ASSERT(ic);

	ostate = vap->iv_state;
	IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s\n", __func__,
		ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
	vap->iv_state = nstate;			/* state transition */
	callout_stop(&vap->iv_mgtsend);		/* XXX callout_drain */
	if (ostate != IEEE80211_S_SCAN)
		ieee80211_cancel_scan(vap);	/* background scan */
	error = 0;
	switch (nstate) {
	case IEEE80211_S_INIT:
		switch (ostate) {
		case IEEE80211_S_SCAN:
			ieee80211_cancel_scan(vap);
			break;
		default:
			break;
		}
		if (ostate != IEEE80211_S_INIT) {
			/* NB: optimize INIT -> INIT case */
			ieee80211_reset_bss(vap);
		}
		break;
	case IEEE80211_S_SCAN:
		switch (ostate) {
		case IEEE80211_S_INIT:
			ieee80211_check_scan_current(vap);
			break;
		default:
			break;
		}
		break;
	case IEEE80211_S_RUN:
		if (ostate == IEEE80211_S_INIT) {
			/*
			 * Already have a channel; bypass the scan
			 * and startup immediately.
			 */
			error = ieee80211_create_wds(vap, ic->ic_curchan);
		}
		break;
	default:
		break;
	}
	return error;
}

/*
 * Process a received frame.  The node associated with the sender
 * should be supplied.  If nothing was found in the node table then
 * the caller is assumed to supply a reference to iv_bss instead.
 * The RSSI and a timestamp are also supplied.  The RSSI data is used
 * during AP scanning to select a AP to associate with; it can have
 * any units so long as values have consistent units and higher values
 * mean ``better signal''.  The receive timestamp is currently not used
 * by the 802.11 layer.
 */
static int
wds_input(struct ieee80211_node *ni, struct mbuf *m,
    const struct ieee80211_rx_stats *rxs, int rssi, int nf)
{
	struct ieee80211vap *vap = ni->ni_vap;
	struct ieee80211com *ic = ni->ni_ic;
	struct ifnet *ifp = vap->iv_ifp;
	struct ieee80211_frame *wh;
	struct ieee80211_key *key;
	struct ether_header *eh;
	int hdrspace, need_tap = 1;	/* mbuf need to be tapped. */
	uint8_t dir, type, subtype, qos;

	if (m->m_flags & M_AMPDU_MPDU) {
		/*
		 * Fastpath for A-MPDU reorder q resubmission.  Frames
		 * w/ M_AMPDU_MPDU marked have already passed through
		 * here but were received out of order and been held on
		 * the reorder queue.  When resubmitted they are marked
		 * with the M_AMPDU_MPDU flag and we can bypass most of
		 * the normal processing.
		 */
		wh = mtod(m, struct ieee80211_frame *);
		type = IEEE80211_FC0_TYPE_DATA;
		dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
		subtype = IEEE80211_FC0_SUBTYPE_QOS;
		hdrspace = ieee80211_hdrspace(ic, wh);	/* XXX optimize? */
		goto resubmit_ampdu;
	}

	KASSERT(ni != NULL, ("null node"));

	type = -1;			/* undefined */

	if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
		IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
		    ni->ni_macaddr, NULL,
		    "too short (1): len %u", m->m_pkthdr.len);
		vap->iv_stats.is_rx_tooshort++;
		goto out;
	}
	/*
	 * Bit of a cheat here, we use a pointer for a 3-address
	 * frame format but don't reference fields past outside
	 * ieee80211_frame_min w/o first validating the data is
	 * present.
	 */
	wh = mtod(m, struct ieee80211_frame *);

	if (!IEEE80211_IS_MULTICAST(wh->i_addr1))
		ni->ni_inact = ni->ni_inact_reload;

	if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
	    IEEE80211_FC0_VERSION_0) {
		IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
		    ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
		    wh->i_fc[0], wh->i_fc[1]);
		vap->iv_stats.is_rx_badversion++;
		goto err;
	}

	dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
	type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
	subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;

	/* NB: WDS vap's do not scan */
	if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_addr4)) {
		IEEE80211_DISCARD_MAC(vap,
		    IEEE80211_MSG_ANY, ni->ni_macaddr, NULL,
		    "too short (3): len %u", m->m_pkthdr.len);
		vap->iv_stats.is_rx_tooshort++;
		goto out;
	}
	/* NB: the TA is implicitly verified by finding the wds peer node */
	if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr) &&
	    !IEEE80211_ADDR_EQ(wh->i_addr1, ifp->if_broadcastaddr)) {
		/* not interested in */
		IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
		    wh->i_addr1, NULL, "%s", "not to bss");
		vap->iv_stats.is_rx_wrongbss++;
		goto out;
	}
	IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
	ni->ni_noise = nf;
	if (IEEE80211_HAS_SEQ(type, subtype)) {
		uint8_t tid = ieee80211_gettid(wh);
		if (IEEE80211_QOS_HAS_SEQ(wh) &&
		    TID_TO_WME_AC(tid) >= WME_AC_VI)
			ic->ic_wme.wme_hipri_traffic++;
		if (! ieee80211_check_rxseq(ni, wh, wh->i_addr1))
			goto out;
	}
	switch (type) {
	case IEEE80211_FC0_TYPE_DATA:
		hdrspace = ieee80211_hdrspace(ic, wh);
		if (m->m_len < hdrspace &&
		    (m = m_pullup(m, hdrspace)) == NULL) {
			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
			    ni->ni_macaddr, NULL,
			    "data too short: expecting %u", hdrspace);
			vap->iv_stats.is_rx_tooshort++;
			goto out;		/* XXX */
		}
		if (dir != IEEE80211_FC1_DIR_DSTODS) {
			IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
			    wh, "data", "incorrect dir 0x%x", dir);
			vap->iv_stats.is_rx_wrongdir++;
			goto out;
		}
		/*
		 * Only legacy WDS traffic should take this path.
		 */
		if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) {
			IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
			    wh, "data", "%s", "not legacy wds");
			vap->iv_stats.is_rx_wrongdir++;/*XXX*/
			goto out;
		}
		/*
		 * Handle A-MPDU re-ordering.  If the frame is to be
		 * processed directly then ieee80211_ampdu_reorder
		 * will return 0; otherwise it has consumed the mbuf
		 * and we should do nothing more with it.
		 */
		if ((m->m_flags & M_AMPDU) &&
		    ieee80211_ampdu_reorder(ni, m) != 0) {
			m = NULL;
			goto out;
		}
	resubmit_ampdu:

		/*
		 * Handle privacy requirements.  Note that we
		 * must not be preempted from here until after
		 * we (potentially) call ieee80211_crypto_demic;
		 * otherwise we may violate assumptions in the
		 * crypto cipher modules used to do delayed update
		 * of replay sequence numbers.
		 */
		if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
			if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
				/*
				 * Discard encrypted frames when privacy is off.
				 */
				IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
				    wh, "WEP", "%s", "PRIVACY off");
				vap->iv_stats.is_rx_noprivacy++;
				IEEE80211_NODE_STAT(ni, rx_noprivacy);
				goto out;
			}
			key = ieee80211_crypto_decap(ni, m, hdrspace);
			if (key == NULL) {
				/* NB: stats+msgs handled in crypto_decap */
				IEEE80211_NODE_STAT(ni, rx_wepfail);
				goto out;
			}
			wh = mtod(m, struct ieee80211_frame *);
			wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
		} else {
			/* XXX M_WEP and IEEE80211_F_PRIVACY */
			key = NULL;
		}

		/*
		 * Save QoS bits for use below--before we strip the header.
		 */
		if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
			qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
			    ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
			    ((struct ieee80211_qosframe *)wh)->i_qos[0];
		} else
			qos = 0;

		/*
		 * Next up, any fragmentation.
		 */
		if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
			m = ieee80211_defrag(ni, m, hdrspace);
			if (m == NULL) {
				/* Fragment dropped or frame not complete yet */
				goto out;
			}
		}
		wh = NULL;		/* no longer valid, catch any uses */

		/*
		 * Next strip any MSDU crypto bits.
		 */
		if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
			    ni->ni_macaddr, "data", "%s", "demic error");
			vap->iv_stats.is_rx_demicfail++;
			IEEE80211_NODE_STAT(ni, rx_demicfail);
			goto out;
		}

		/* copy to listener after decrypt */
		if (ieee80211_radiotap_active_vap(vap))
			ieee80211_radiotap_rx(vap, m);
		need_tap = 0;

		/*
		 * Finally, strip the 802.11 header.
		 */
		m = ieee80211_decap(vap, m, hdrspace);
		if (m == NULL) {
			/* XXX mask bit to check for both */
			/* don't count Null data frames as errors */
			if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
			    subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
				goto out;
			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
			    ni->ni_macaddr, "data", "%s", "decap error");
			vap->iv_stats.is_rx_decap++;
			IEEE80211_NODE_STAT(ni, rx_decap);
			goto err;
		}
		eh = mtod(m, struct ether_header *);
		if (!ieee80211_node_is_authorized(ni)) {
			/*
			 * Deny any non-PAE frames received prior to
			 * authorization.  For open/shared-key
			 * authentication the port is mark authorized
			 * after authentication completes.  For 802.1x
			 * the port is not marked authorized by the
			 * authenticator until the handshake has completed.
			 */
			if (eh->ether_type != htons(ETHERTYPE_PAE)) {
				IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
				    eh->ether_shost, "data",
				    "unauthorized port: ether type 0x%x len %u",
				    eh->ether_type, m->m_pkthdr.len);
				vap->iv_stats.is_rx_unauth++;
				IEEE80211_NODE_STAT(ni, rx_unauth);
				goto err;
			}
		} else {
			/*
			 * When denying unencrypted frames, discard
			 * any non-PAE frames received without encryption.
			 */
			if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
			    (key == NULL && (m->m_flags & M_WEP) == 0) &&
			    eh->ether_type != htons(ETHERTYPE_PAE)) {
				/*
				 * Drop unencrypted frames.
				 */
				vap->iv_stats.is_rx_unencrypted++;
				IEEE80211_NODE_STAT(ni, rx_unencrypted);
				goto out;
			}
		}
		/* XXX require HT? */
		if (qos & IEEE80211_QOS_AMSDU) {
			m = ieee80211_decap_amsdu(ni, m);
			if (m == NULL)
				return IEEE80211_FC0_TYPE_DATA;
		} else {
#ifdef IEEE80211_SUPPORT_SUPERG
			m = ieee80211_decap_fastframe(vap, ni, m);
			if (m == NULL)
				return IEEE80211_FC0_TYPE_DATA;
#endif
		}
		ieee80211_deliver_data(vap, ni, m);
		return IEEE80211_FC0_TYPE_DATA;

	case IEEE80211_FC0_TYPE_MGT:
		vap->iv_stats.is_rx_mgmt++;
		IEEE80211_NODE_STAT(ni, rx_mgmt);
		if (dir != IEEE80211_FC1_DIR_NODS) {
			IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
			    wh, "data", "incorrect dir 0x%x", dir);
			vap->iv_stats.is_rx_wrongdir++;
			goto err;
		}
		if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
			    ni->ni_macaddr, "mgt", "too short: len %u",
			    m->m_pkthdr.len);
			vap->iv_stats.is_rx_tooshort++;
			goto out;
		}
#ifdef IEEE80211_DEBUG
		if (ieee80211_msg_debug(vap) || ieee80211_msg_dumppkts(vap)) {
			if_printf(ifp, "received %s from %s rssi %d\n",
			    ieee80211_mgt_subtype_name(subtype),
			    ether_sprintf(wh->i_addr2), rssi);
		}
#endif
		if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
			IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
			    wh, NULL, "%s", "WEP set but not permitted");
			vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
			goto out;
		}
		vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf);
		goto out;

	case IEEE80211_FC0_TYPE_CTL:
		vap->iv_stats.is_rx_ctl++;
		IEEE80211_NODE_STAT(ni, rx_ctrl);
		goto out;

	default:
		IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
		    wh, "bad", "frame type 0x%x", type);
		/* should not come here */
		break;
	}
err:
	if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
out:
	if (m != NULL) {
		if (need_tap && ieee80211_radiotap_active_vap(vap))
			ieee80211_radiotap_rx(vap, m);
		m_freem(m);
	}
	return type;
}

static void
wds_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, int subtype,
    const struct ieee80211_rx_stats *rxs, int rssi, int nf)
{
	struct ieee80211vap *vap = ni->ni_vap;
	struct ieee80211com *ic = ni->ni_ic;
	struct ieee80211_frame *wh;
	u_int8_t *frm, *efrm;

	wh = mtod(m0, struct ieee80211_frame *);
	frm = (u_int8_t *)&wh[1];
	efrm = mtod(m0, u_int8_t *) + m0->m_len;
	switch (subtype) {
	case IEEE80211_FC0_SUBTYPE_ACTION:
	case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
		if (ni == vap->iv_bss) {
			IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
			    wh, NULL, "%s", "unknown node");
			vap->iv_stats.is_rx_mgtdiscard++;
		} else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1)) {
			/* NB: not interested in multicast frames. */
			IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
			    wh, NULL, "%s", "not for us");
			vap->iv_stats.is_rx_mgtdiscard++;
		} else if (vap->iv_state != IEEE80211_S_RUN) {
			IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
			    wh, NULL, "wrong state %s",
			    ieee80211_state_name[vap->iv_state]);
			vap->iv_stats.is_rx_mgtdiscard++;
		} else {
			if (ieee80211_parse_action(ni, m0) == 0)
				(void)ic->ic_recv_action(ni, wh, frm, efrm);
		}
		break;

	case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
	case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
	case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
	case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
	case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
	case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
	case IEEE80211_FC0_SUBTYPE_TIMING_ADV:
	case IEEE80211_FC0_SUBTYPE_BEACON:
	case IEEE80211_FC0_SUBTYPE_ATIM:
	case IEEE80211_FC0_SUBTYPE_DISASSOC:
	case IEEE80211_FC0_SUBTYPE_AUTH:
	case IEEE80211_FC0_SUBTYPE_DEAUTH:
		IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
		    wh, NULL, "%s", "not handled");
		vap->iv_stats.is_rx_mgtdiscard++;
		break;

	default:
		IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
		    wh, "mgt", "subtype 0x%x not handled", subtype);
		vap->iv_stats.is_rx_badsubtype++;
		break;
	}
}
OpenPOWER on IntegriCloud