xref: /freebsd/sys/net80211/ieee80211_sta.c (revision 7aa383846770374466b1dcb2cefd71bde9acf463)
1 /*-
2  * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24  */
25 
26 #include <sys/cdefs.h>
27 #ifdef __FreeBSD__
28 __FBSDID("$FreeBSD$");
29 #endif
30 
31 /*
32  * IEEE 802.11 Station mode support.
33  */
34 #include "opt_inet.h"
35 #include "opt_wlan.h"
36 
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/mbuf.h>
40 #include <sys/malloc.h>
41 #include <sys/kernel.h>
42 
43 #include <sys/socket.h>
44 #include <sys/sockio.h>
45 #include <sys/endian.h>
46 #include <sys/errno.h>
47 #include <sys/proc.h>
48 #include <sys/sysctl.h>
49 
50 #include <net/if.h>
51 #include <net/if_media.h>
52 #include <net/if_llc.h>
53 #include <net/ethernet.h>
54 
55 #include <net/bpf.h>
56 
57 #include <net80211/ieee80211_var.h>
58 #include <net80211/ieee80211_sta.h>
59 #include <net80211/ieee80211_input.h>
60 #ifdef IEEE80211_SUPPORT_SUPERG
61 #include <net80211/ieee80211_superg.h>
62 #endif
63 
64 #define	IEEE80211_RATE2MBS(r)	(((r) & IEEE80211_RATE_VAL) / 2)
65 
66 static	void sta_vattach(struct ieee80211vap *);
67 static	void sta_beacon_miss(struct ieee80211vap *);
68 static	int sta_newstate(struct ieee80211vap *, enum ieee80211_state, int);
69 static	int sta_input(struct ieee80211_node *, struct mbuf *, int, int);
70 static void sta_recv_mgmt(struct ieee80211_node *, struct mbuf *,
71 	    int subtype, int rssi, int nf);
72 static void sta_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype);
73 
74 void
75 ieee80211_sta_attach(struct ieee80211com *ic)
76 {
77 	ic->ic_vattach[IEEE80211_M_STA] = sta_vattach;
78 }
79 
80 void
81 ieee80211_sta_detach(struct ieee80211com *ic)
82 {
83 }
84 
85 static void
86 sta_vdetach(struct ieee80211vap *vap)
87 {
88 }
89 
90 static void
91 sta_vattach(struct ieee80211vap *vap)
92 {
93 	vap->iv_newstate = sta_newstate;
94 	vap->iv_input = sta_input;
95 	vap->iv_recv_mgmt = sta_recv_mgmt;
96 	vap->iv_recv_ctl = sta_recv_ctl;
97 	vap->iv_opdetach = sta_vdetach;
98 	vap->iv_bmiss = sta_beacon_miss;
99 }
100 
101 /*
102  * Handle a beacon miss event.  The common code filters out
103  * spurious events that can happen when scanning and/or before
104  * reaching RUN state.
105  */
106 static void
107 sta_beacon_miss(struct ieee80211vap *vap)
108 {
109 	struct ieee80211com *ic = vap->iv_ic;
110 
111 	KASSERT((ic->ic_flags & IEEE80211_F_SCAN) == 0, ("scanning"));
112 	KASSERT(vap->iv_state >= IEEE80211_S_RUN,
113 	    ("wrong state %s", ieee80211_state_name[vap->iv_state]));
114 
115 	IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG,
116 	    "beacon miss, mode %s state %s\n",
117 	    ieee80211_opmode_name[vap->iv_opmode],
118 	    ieee80211_state_name[vap->iv_state]);
119 
120 	if (vap->iv_state == IEEE80211_S_CSA) {
121 		/*
122 		 * A Channel Switch is pending; assume we missed the
123 		 * beacon that would've completed the process and just
124 		 * force the switch.  If we made a mistake we'll not
125 		 * find the AP on the new channel and fall back to a
126 		 * normal scan.
127 		 */
128 		ieee80211_csa_completeswitch(ic);
129 		return;
130 	}
131 	if (++vap->iv_bmiss_count < vap->iv_bmiss_max) {
132 		/*
133 		 * Send a directed probe req before falling back to a
134 		 * scan; if we receive a response ic_bmiss_count will
135 		 * be reset.  Some cards mistakenly report beacon miss
136 		 * so this avoids the expensive scan if the ap is
137 		 * still there.
138 		 */
139 		ieee80211_send_probereq(vap->iv_bss, vap->iv_myaddr,
140 			vap->iv_bss->ni_bssid, vap->iv_bss->ni_bssid,
141 			vap->iv_bss->ni_essid, vap->iv_bss->ni_esslen);
142 		return;
143 	}
144 
145 	callout_stop(&vap->iv_swbmiss);
146 	vap->iv_bmiss_count = 0;
147 	vap->iv_stats.is_beacon_miss++;
148 	if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
149 #ifdef IEEE80211_SUPPORT_SUPERG
150 		struct ieee80211com *ic = vap->iv_ic;
151 
152 		/*
153 		 * If we receive a beacon miss interrupt when using
154 		 * dynamic turbo, attempt to switch modes before
155 		 * reassociating.
156 		 */
157 		if (IEEE80211_ATH_CAP(vap, vap->iv_bss, IEEE80211_NODE_TURBOP))
158 			ieee80211_dturbo_switch(vap,
159 			    ic->ic_bsschan->ic_flags ^ IEEE80211_CHAN_TURBO);
160 #endif
161 		/*
162 		 * Try to reassociate before scanning for a new ap.
163 		 */
164 		ieee80211_new_state(vap, IEEE80211_S_ASSOC, 1);
165 	} else {
166 		/*
167 		 * Somebody else is controlling state changes (e.g.
168 		 * a user-mode app) don't do anything that would
169 		 * confuse them; just drop into scan mode so they'll
170 		 * notified of the state change and given control.
171 		 */
172 		ieee80211_new_state(vap, IEEE80211_S_SCAN, 0);
173 	}
174 }
175 
176 /*
177  * Handle deauth with reason.  We retry only for
178  * the cases where we might succeed.  Otherwise
179  * we downgrade the ap and scan.
180  */
181 static void
182 sta_authretry(struct ieee80211vap *vap, struct ieee80211_node *ni, int reason)
183 {
184 	switch (reason) {
185 	case IEEE80211_STATUS_SUCCESS:		/* NB: MLME assoc */
186 	case IEEE80211_STATUS_TIMEOUT:
187 	case IEEE80211_REASON_ASSOC_EXPIRE:
188 	case IEEE80211_REASON_NOT_AUTHED:
189 	case IEEE80211_REASON_NOT_ASSOCED:
190 	case IEEE80211_REASON_ASSOC_LEAVE:
191 	case IEEE80211_REASON_ASSOC_NOT_AUTHED:
192 		IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, 1);
193 		break;
194 	default:
195 		ieee80211_scan_assoc_fail(vap, vap->iv_bss->ni_macaddr, reason);
196 		if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
197 			ieee80211_check_scan_current(vap);
198 		break;
199 	}
200 }
201 
202 /*
203  * IEEE80211_M_STA vap state machine handler.
204  * This routine handles the main states in the 802.11 protocol.
205  */
206 static int
207 sta_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
208 {
209 	struct ieee80211com *ic = vap->iv_ic;
210 	struct ieee80211_node *ni;
211 	enum ieee80211_state ostate;
212 
213 	IEEE80211_LOCK_ASSERT(ic);
214 
215 	ostate = vap->iv_state;
216 	IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
217 	    __func__, ieee80211_state_name[ostate],
218 	    ieee80211_state_name[nstate], arg);
219 	vap->iv_state = nstate;			/* state transition */
220 	callout_stop(&vap->iv_mgtsend);		/* XXX callout_drain */
221 	if (ostate != IEEE80211_S_SCAN)
222 		ieee80211_cancel_scan(vap);	/* background scan */
223 	ni = vap->iv_bss;			/* NB: no reference held */
224 	if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)
225 		callout_stop(&vap->iv_swbmiss);
226 	switch (nstate) {
227 	case IEEE80211_S_INIT:
228 		switch (ostate) {
229 		case IEEE80211_S_SLEEP:
230 			/* XXX wakeup */
231 		case IEEE80211_S_RUN:
232 			IEEE80211_SEND_MGMT(ni,
233 			    IEEE80211_FC0_SUBTYPE_DISASSOC,
234 			    IEEE80211_REASON_ASSOC_LEAVE);
235 			ieee80211_sta_leave(ni);
236 			break;
237 		case IEEE80211_S_ASSOC:
238 			IEEE80211_SEND_MGMT(ni,
239 			    IEEE80211_FC0_SUBTYPE_DEAUTH,
240 			    IEEE80211_REASON_AUTH_LEAVE);
241 			break;
242 		case IEEE80211_S_SCAN:
243 			ieee80211_cancel_scan(vap);
244 			break;
245 		default:
246 			goto invalid;
247 		}
248 		if (ostate != IEEE80211_S_INIT) {
249 			/* NB: optimize INIT -> INIT case */
250 			ieee80211_reset_bss(vap);
251 		}
252 		if (vap->iv_auth->ia_detach != NULL)
253 			vap->iv_auth->ia_detach(vap);
254 		break;
255 	case IEEE80211_S_SCAN:
256 		switch (ostate) {
257 		case IEEE80211_S_INIT:
258 			/*
259 			 * Initiate a scan.  We can come here as a result
260 			 * of an IEEE80211_IOC_SCAN_REQ too in which case
261 			 * the vap will be marked with IEEE80211_FEXT_SCANREQ
262 			 * and the scan request parameters will be present
263 			 * in iv_scanreq.  Otherwise we do the default.
264 			 */
265 			if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
266 				ieee80211_check_scan(vap,
267 				    vap->iv_scanreq_flags,
268 				    vap->iv_scanreq_duration,
269 				    vap->iv_scanreq_mindwell,
270 				    vap->iv_scanreq_maxdwell,
271 				    vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
272 				vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
273 			} else
274 				ieee80211_check_scan_current(vap);
275 			break;
276 		case IEEE80211_S_SCAN:
277 		case IEEE80211_S_AUTH:
278 		case IEEE80211_S_ASSOC:
279 			/*
280 			 * These can happen either because of a timeout
281 			 * on an assoc/auth response or because of a
282 			 * change in state that requires a reset.  For
283 			 * the former we're called with a non-zero arg
284 			 * that is the cause for the failure; pass this
285 			 * to the scan code so it can update state.
286 			 * Otherwise trigger a new scan unless we're in
287 			 * manual roaming mode in which case an application
288 			 * must issue an explicit scan request.
289 			 */
290 			if (arg != 0)
291 				ieee80211_scan_assoc_fail(vap,
292 					vap->iv_bss->ni_macaddr, arg);
293 			if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
294 				ieee80211_check_scan_current(vap);
295 			break;
296 		case IEEE80211_S_RUN:		/* beacon miss */
297 			/*
298 			 * Beacon miss.  Notify user space and if not
299 			 * under control of a user application (roaming
300 			 * manual) kick off a scan to re-connect.
301 			 */
302 			ieee80211_sta_leave(ni);
303 			if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
304 				ieee80211_check_scan_current(vap);
305 			break;
306 		default:
307 			goto invalid;
308 		}
309 		break;
310 	case IEEE80211_S_AUTH:
311 		switch (ostate) {
312 		case IEEE80211_S_INIT:
313 		case IEEE80211_S_SCAN:
314 			IEEE80211_SEND_MGMT(ni,
315 			    IEEE80211_FC0_SUBTYPE_AUTH, 1);
316 			break;
317 		case IEEE80211_S_AUTH:
318 		case IEEE80211_S_ASSOC:
319 			switch (arg & 0xff) {
320 			case IEEE80211_FC0_SUBTYPE_AUTH:
321 				/* ??? */
322 				IEEE80211_SEND_MGMT(ni,
323 				    IEEE80211_FC0_SUBTYPE_AUTH, 2);
324 				break;
325 			case IEEE80211_FC0_SUBTYPE_DEAUTH:
326 				sta_authretry(vap, ni, arg>>8);
327 				break;
328 			}
329 			break;
330 		case IEEE80211_S_RUN:
331 			switch (arg & 0xff) {
332 			case IEEE80211_FC0_SUBTYPE_AUTH:
333 				IEEE80211_SEND_MGMT(ni,
334 				    IEEE80211_FC0_SUBTYPE_AUTH, 2);
335 				vap->iv_state = ostate;	/* stay RUN */
336 				break;
337 			case IEEE80211_FC0_SUBTYPE_DEAUTH:
338 				ieee80211_sta_leave(ni);
339 				if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
340 					/* try to reauth */
341 					IEEE80211_SEND_MGMT(ni,
342 					    IEEE80211_FC0_SUBTYPE_AUTH, 1);
343 				}
344 				break;
345 			}
346 			break;
347 		default:
348 			goto invalid;
349 		}
350 		break;
351 	case IEEE80211_S_ASSOC:
352 		switch (ostate) {
353 		case IEEE80211_S_AUTH:
354 		case IEEE80211_S_ASSOC:
355 			IEEE80211_SEND_MGMT(ni,
356 			    IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0);
357 			break;
358 		case IEEE80211_S_SLEEP:		/* cannot happen */
359 		case IEEE80211_S_RUN:
360 			ieee80211_sta_leave(ni);
361 			if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
362 				IEEE80211_SEND_MGMT(ni, arg ?
363 				    IEEE80211_FC0_SUBTYPE_REASSOC_REQ :
364 				    IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0);
365 			}
366 			break;
367 		default:
368 			goto invalid;
369 		}
370 		break;
371 	case IEEE80211_S_RUN:
372 		if (vap->iv_flags & IEEE80211_F_WPA) {
373 			/* XXX validate prerequisites */
374 		}
375 		switch (ostate) {
376 		case IEEE80211_S_RUN:
377 		case IEEE80211_S_CSA:
378 			break;
379 		case IEEE80211_S_AUTH:		/* when join is done in fw */
380 		case IEEE80211_S_ASSOC:
381 #ifdef IEEE80211_DEBUG
382 			if (ieee80211_msg_debug(vap)) {
383 				ieee80211_note(vap, "%s with %s ssid ",
384 				    (vap->iv_opmode == IEEE80211_M_STA ?
385 				    "associated" : "synchronized"),
386 				    ether_sprintf(ni->ni_bssid));
387 				ieee80211_print_essid(vap->iv_bss->ni_essid,
388 				    ni->ni_esslen);
389 				/* XXX MCS/HT */
390 				printf(" channel %d start %uMb\n",
391 				    ieee80211_chan2ieee(ic, ic->ic_curchan),
392 				    IEEE80211_RATE2MBS(ni->ni_txrate));
393 			}
394 #endif
395 			ieee80211_scan_assoc_success(vap, ni->ni_macaddr);
396 			ieee80211_notify_node_join(ni,
397 			    arg == IEEE80211_FC0_SUBTYPE_ASSOC_RESP);
398 			break;
399 		case IEEE80211_S_SLEEP:
400 			ieee80211_sta_pwrsave(vap, 0);
401 			break;
402 		default:
403 			goto invalid;
404 		}
405 		ieee80211_sync_curchan(ic);
406 		if (ostate != IEEE80211_S_RUN &&
407 		    (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)) {
408 			/*
409 			 * Start s/w beacon miss timer for devices w/o
410 			 * hardware support.  We fudge a bit here since
411 			 * we're doing this in software.
412 			 */
413 			vap->iv_swbmiss_period = IEEE80211_TU_TO_TICKS(
414 				2 * vap->iv_bmissthreshold * ni->ni_intval);
415 			vap->iv_swbmiss_count = 0;
416 			callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period,
417 				ieee80211_swbmiss, vap);
418 		}
419 		/*
420 		 * When 802.1x is not in use mark the port authorized
421 		 * at this point so traffic can flow.
422 		 */
423 		if (ni->ni_authmode != IEEE80211_AUTH_8021X)
424 			ieee80211_node_authorize(ni);
425 		/*
426 		 * Fake association when joining an existing bss.
427 		 */
428 		if (ic->ic_newassoc != NULL)
429 			ic->ic_newassoc(vap->iv_bss, ostate != IEEE80211_S_RUN);
430 		break;
431 	case IEEE80211_S_CSA:
432 		if (ostate != IEEE80211_S_RUN)
433 			goto invalid;
434 		break;
435 	case IEEE80211_S_SLEEP:
436 		ieee80211_sta_pwrsave(vap, 1);
437 		break;
438 	default:
439 	invalid:
440 		IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
441 		    "%s: unexpected state transition %s -> %s\n", __func__,
442 		    ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
443 		break;
444 	}
445 	return 0;
446 }
447 
448 /*
449  * Return non-zero if the frame is an echo of a multicast
450  * frame sent by ourself.  The dir is known to be DSTODS.
451  */
452 static __inline int
453 isdstods_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh)
454 {
455 #define	QWH4(wh)	((const struct ieee80211_qosframe_addr4 *)wh)
456 #define	WH4(wh)		((const struct ieee80211_frame_addr4 *)wh)
457 	const uint8_t *sa;
458 
459 	KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode"));
460 
461 	if (!IEEE80211_IS_MULTICAST(wh->i_addr3))
462 		return 0;
463 	sa = IEEE80211_QOS_HAS_SEQ(wh) ? QWH4(wh)->i_addr4 : WH4(wh)->i_addr4;
464 	return IEEE80211_ADDR_EQ(sa, vap->iv_myaddr);
465 #undef WH4
466 #undef QWH4
467 }
468 
469 /*
470  * Return non-zero if the frame is an echo of a multicast
471  * frame sent by ourself.  The dir is known to be FROMDS.
472  */
473 static __inline int
474 isfromds_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh)
475 {
476 	KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode"));
477 
478 	if (!IEEE80211_IS_MULTICAST(wh->i_addr1))
479 		return 0;
480 	return IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_myaddr);
481 }
482 
483 /*
484  * Decide if a received management frame should be
485  * printed when debugging is enabled.  This filters some
486  * of the less interesting frames that come frequently
487  * (e.g. beacons).
488  */
489 static __inline int
490 doprint(struct ieee80211vap *vap, int subtype)
491 {
492 	switch (subtype) {
493 	case IEEE80211_FC0_SUBTYPE_BEACON:
494 		return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
495 	case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
496 		return 0;
497 	}
498 	return 1;
499 }
500 
501 /*
502  * Process a received frame.  The node associated with the sender
503  * should be supplied.  If nothing was found in the node table then
504  * the caller is assumed to supply a reference to iv_bss instead.
505  * The RSSI and a timestamp are also supplied.  The RSSI data is used
506  * during AP scanning to select a AP to associate with; it can have
507  * any units so long as values have consistent units and higher values
508  * mean ``better signal''.  The receive timestamp is currently not used
509  * by the 802.11 layer.
510  */
511 static int
512 sta_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
513 {
514 #define	SEQ_LEQ(a,b)	((int)((a)-(b)) <= 0)
515 #define	HAS_SEQ(type)	((type & 0x4) == 0)
516 	struct ieee80211vap *vap = ni->ni_vap;
517 	struct ieee80211com *ic = ni->ni_ic;
518 	struct ifnet *ifp = vap->iv_ifp;
519 	struct ieee80211_frame *wh;
520 	struct ieee80211_key *key;
521 	struct ether_header *eh;
522 	int hdrspace, need_tap = 1;	/* mbuf need to be tapped. */
523 	uint8_t dir, type, subtype, qos;
524 	uint8_t *bssid;
525 	uint16_t rxseq;
526 
527 	if (m->m_flags & M_AMPDU_MPDU) {
528 		/*
529 		 * Fastpath for A-MPDU reorder q resubmission.  Frames
530 		 * w/ M_AMPDU_MPDU marked have already passed through
531 		 * here but were received out of order and been held on
532 		 * the reorder queue.  When resubmitted they are marked
533 		 * with the M_AMPDU_MPDU flag and we can bypass most of
534 		 * the normal processing.
535 		 */
536 		wh = mtod(m, struct ieee80211_frame *);
537 		type = IEEE80211_FC0_TYPE_DATA;
538 		dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
539 		subtype = IEEE80211_FC0_SUBTYPE_QOS;
540 		hdrspace = ieee80211_hdrspace(ic, wh);	/* XXX optimize? */
541 		goto resubmit_ampdu;
542 	}
543 
544 	KASSERT(ni != NULL, ("null node"));
545 	ni->ni_inact = ni->ni_inact_reload;
546 
547 	type = -1;			/* undefined */
548 
549 	if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
550 		IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
551 		    ni->ni_macaddr, NULL,
552 		    "too short (1): len %u", m->m_pkthdr.len);
553 		vap->iv_stats.is_rx_tooshort++;
554 		goto out;
555 	}
556 	/*
557 	 * Bit of a cheat here, we use a pointer for a 3-address
558 	 * frame format but don't reference fields past outside
559 	 * ieee80211_frame_min w/o first validating the data is
560 	 * present.
561 	 */
562 	wh = mtod(m, struct ieee80211_frame *);
563 
564 	if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
565 	    IEEE80211_FC0_VERSION_0) {
566 		IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
567 		    ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
568 		    wh->i_fc[0], wh->i_fc[1]);
569 		vap->iv_stats.is_rx_badversion++;
570 		goto err;
571 	}
572 
573 	dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
574 	type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
575 	subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
576 	if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
577 		bssid = wh->i_addr2;
578 		if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) {
579 			/* not interested in */
580 			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
581 			    bssid, NULL, "%s", "not to bss");
582 			vap->iv_stats.is_rx_wrongbss++;
583 			goto out;
584 		}
585 		IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
586 		ni->ni_noise = nf;
587 		if (HAS_SEQ(type) && !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
588 			uint8_t tid = ieee80211_gettid(wh);
589 			if (IEEE80211_QOS_HAS_SEQ(wh) &&
590 			    TID_TO_WME_AC(tid) >= WME_AC_VI)
591 				ic->ic_wme.wme_hipri_traffic++;
592 			rxseq = le16toh(*(uint16_t *)wh->i_seq);
593 			if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 &&
594 			    (wh->i_fc[1] & IEEE80211_FC1_RETRY) &&
595 			    SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) {
596 				/* duplicate, discard */
597 				IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
598 				    bssid, "duplicate",
599 				    "seqno <%u,%u> fragno <%u,%u> tid %u",
600 				    rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
601 				    ni->ni_rxseqs[tid] >>
602 					IEEE80211_SEQ_SEQ_SHIFT,
603 				    rxseq & IEEE80211_SEQ_FRAG_MASK,
604 				    ni->ni_rxseqs[tid] &
605 					IEEE80211_SEQ_FRAG_MASK,
606 				    tid);
607 				vap->iv_stats.is_rx_dup++;
608 				IEEE80211_NODE_STAT(ni, rx_dup);
609 				goto out;
610 			}
611 			ni->ni_rxseqs[tid] = rxseq;
612 		}
613 	}
614 
615 	switch (type) {
616 	case IEEE80211_FC0_TYPE_DATA:
617 		hdrspace = ieee80211_hdrspace(ic, wh);
618 		if (m->m_len < hdrspace &&
619 		    (m = m_pullup(m, hdrspace)) == NULL) {
620 			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
621 			    ni->ni_macaddr, NULL,
622 			    "data too short: expecting %u", hdrspace);
623 			vap->iv_stats.is_rx_tooshort++;
624 			goto out;		/* XXX */
625 		}
626 		/*
627 		 * Handle A-MPDU re-ordering.  If the frame is to be
628 		 * processed directly then ieee80211_ampdu_reorder
629 		 * will return 0; otherwise it has consumed the mbuf
630 		 * and we should do nothing more with it.
631 		 */
632 		if ((m->m_flags & M_AMPDU) &&
633 		    (dir == IEEE80211_FC1_DIR_FROMDS ||
634 		     dir == IEEE80211_FC1_DIR_DSTODS) &&
635 		    ieee80211_ampdu_reorder(ni, m) != 0) {
636 			m = NULL;
637 			goto out;
638 		}
639 	resubmit_ampdu:
640 		if (dir == IEEE80211_FC1_DIR_FROMDS) {
641 			if ((ifp->if_flags & IFF_SIMPLEX) &&
642 			    isfromds_mcastecho(vap, wh)) {
643 				/*
644 				 * In IEEE802.11 network, multicast
645 				 * packets sent from "me" are broadcast
646 				 * from the AP; silently discard for
647 				 * SIMPLEX interface.
648 				 */
649 				IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
650 				    wh, "data", "%s", "multicast echo");
651 				vap->iv_stats.is_rx_mcastecho++;
652 				goto out;
653 			}
654 			if ((vap->iv_flags & IEEE80211_F_DWDS) &&
655 			    IEEE80211_IS_MULTICAST(wh->i_addr1)) {
656 				/*
657 				 * DWDS sta's must drop 3-address mcast frames
658 				 * as they will be sent separately as a 4-addr
659 				 * frame.  Accepting the 3-addr frame will
660 				 * confuse the bridge into thinking the sending
661 				 * sta is located at the end of WDS link.
662 				 */
663 				IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
664 				    "3-address data", "%s", "DWDS enabled");
665 				vap->iv_stats.is_rx_mcastecho++;
666 				goto out;
667 			}
668 		} else if (dir == IEEE80211_FC1_DIR_DSTODS) {
669 			if ((vap->iv_flags & IEEE80211_F_DWDS) == 0) {
670 				IEEE80211_DISCARD(vap,
671 				    IEEE80211_MSG_INPUT, wh, "4-address data",
672 				    "%s", "DWDS not enabled");
673 				vap->iv_stats.is_rx_wrongdir++;
674 				goto out;
675 			}
676 			if ((ifp->if_flags & IFF_SIMPLEX) &&
677 			    isdstods_mcastecho(vap, wh)) {
678 				/*
679 				 * In IEEE802.11 network, multicast
680 				 * packets sent from "me" are broadcast
681 				 * from the AP; silently discard for
682 				 * SIMPLEX interface.
683 				 */
684 				IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
685 				    "4-address data", "%s", "multicast echo");
686 				vap->iv_stats.is_rx_mcastecho++;
687 				goto out;
688 			}
689 		} else {
690 			IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
691 			    "data", "incorrect dir 0x%x", dir);
692 			vap->iv_stats.is_rx_wrongdir++;
693 			goto out;
694 		}
695 
696 		/*
697 		 * Handle privacy requirements.  Note that we
698 		 * must not be preempted from here until after
699 		 * we (potentially) call ieee80211_crypto_demic;
700 		 * otherwise we may violate assumptions in the
701 		 * crypto cipher modules used to do delayed update
702 		 * of replay sequence numbers.
703 		 */
704 		if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
705 			if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
706 				/*
707 				 * Discard encrypted frames when privacy is off.
708 				 */
709 				IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
710 				    wh, "WEP", "%s", "PRIVACY off");
711 				vap->iv_stats.is_rx_noprivacy++;
712 				IEEE80211_NODE_STAT(ni, rx_noprivacy);
713 				goto out;
714 			}
715 			key = ieee80211_crypto_decap(ni, m, hdrspace);
716 			if (key == NULL) {
717 				/* NB: stats+msgs handled in crypto_decap */
718 				IEEE80211_NODE_STAT(ni, rx_wepfail);
719 				goto out;
720 			}
721 			wh = mtod(m, struct ieee80211_frame *);
722 			wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
723 		} else {
724 			/* XXX M_WEP and IEEE80211_F_PRIVACY */
725 			key = NULL;
726 		}
727 
728 		/*
729 		 * Save QoS bits for use below--before we strip the header.
730 		 */
731 		if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
732 			qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
733 			    ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
734 			    ((struct ieee80211_qosframe *)wh)->i_qos[0];
735 		} else
736 			qos = 0;
737 
738 		/*
739 		 * Next up, any fragmentation.
740 		 */
741 		if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
742 			m = ieee80211_defrag(ni, m, hdrspace);
743 			if (m == NULL) {
744 				/* Fragment dropped or frame not complete yet */
745 				goto out;
746 			}
747 		}
748 		wh = NULL;		/* no longer valid, catch any uses */
749 
750 		/*
751 		 * Next strip any MSDU crypto bits.
752 		 */
753 		if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
754 			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
755 			    ni->ni_macaddr, "data", "%s", "demic error");
756 			vap->iv_stats.is_rx_demicfail++;
757 			IEEE80211_NODE_STAT(ni, rx_demicfail);
758 			goto out;
759 		}
760 
761 		/* copy to listener after decrypt */
762 		if (ieee80211_radiotap_active_vap(vap))
763 			ieee80211_radiotap_rx(vap, m);
764 		need_tap = 0;
765 
766 		/*
767 		 * Finally, strip the 802.11 header.
768 		 */
769 		m = ieee80211_decap(vap, m, hdrspace);
770 		if (m == NULL) {
771 			/* XXX mask bit to check for both */
772 			/* don't count Null data frames as errors */
773 			if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
774 			    subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
775 				goto out;
776 			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
777 			    ni->ni_macaddr, "data", "%s", "decap error");
778 			vap->iv_stats.is_rx_decap++;
779 			IEEE80211_NODE_STAT(ni, rx_decap);
780 			goto err;
781 		}
782 		eh = mtod(m, struct ether_header *);
783 		if (!ieee80211_node_is_authorized(ni)) {
784 			/*
785 			 * Deny any non-PAE frames received prior to
786 			 * authorization.  For open/shared-key
787 			 * authentication the port is mark authorized
788 			 * after authentication completes.  For 802.1x
789 			 * the port is not marked authorized by the
790 			 * authenticator until the handshake has completed.
791 			 */
792 			if (eh->ether_type != htons(ETHERTYPE_PAE)) {
793 				IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
794 				    eh->ether_shost, "data",
795 				    "unauthorized port: ether type 0x%x len %u",
796 				    eh->ether_type, m->m_pkthdr.len);
797 				vap->iv_stats.is_rx_unauth++;
798 				IEEE80211_NODE_STAT(ni, rx_unauth);
799 				goto err;
800 			}
801 		} else {
802 			/*
803 			 * When denying unencrypted frames, discard
804 			 * any non-PAE frames received without encryption.
805 			 */
806 			if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
807 			    (key == NULL && (m->m_flags & M_WEP) == 0) &&
808 			    eh->ether_type != htons(ETHERTYPE_PAE)) {
809 				/*
810 				 * Drop unencrypted frames.
811 				 */
812 				vap->iv_stats.is_rx_unencrypted++;
813 				IEEE80211_NODE_STAT(ni, rx_unencrypted);
814 				goto out;
815 			}
816 		}
817 		/* XXX require HT? */
818 		if (qos & IEEE80211_QOS_AMSDU) {
819 			m = ieee80211_decap_amsdu(ni, m);
820 			if (m == NULL)
821 				return IEEE80211_FC0_TYPE_DATA;
822 		} else {
823 #ifdef IEEE80211_SUPPORT_SUPERG
824 			m = ieee80211_decap_fastframe(vap, ni, m);
825 			if (m == NULL)
826 				return IEEE80211_FC0_TYPE_DATA;
827 #endif
828 		}
829 		ieee80211_deliver_data(vap, ni, m);
830 		return IEEE80211_FC0_TYPE_DATA;
831 
832 	case IEEE80211_FC0_TYPE_MGT:
833 		vap->iv_stats.is_rx_mgmt++;
834 		IEEE80211_NODE_STAT(ni, rx_mgmt);
835 		if (dir != IEEE80211_FC1_DIR_NODS) {
836 			IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
837 			    wh, "data", "incorrect dir 0x%x", dir);
838 			vap->iv_stats.is_rx_wrongdir++;
839 			goto err;
840 		}
841 		if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
842 			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
843 			    ni->ni_macaddr, "mgt", "too short: len %u",
844 			    m->m_pkthdr.len);
845 			vap->iv_stats.is_rx_tooshort++;
846 			goto out;
847 		}
848 #ifdef IEEE80211_DEBUG
849 		if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
850 		    ieee80211_msg_dumppkts(vap)) {
851 			if_printf(ifp, "received %s from %s rssi %d\n",
852 			    ieee80211_mgt_subtype_name[subtype >>
853 				IEEE80211_FC0_SUBTYPE_SHIFT],
854 			    ether_sprintf(wh->i_addr2), rssi);
855 		}
856 #endif
857 		if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
858 			if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) {
859 				/*
860 				 * Only shared key auth frames with a challenge
861 				 * should be encrypted, discard all others.
862 				 */
863 				IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
864 				    wh, ieee80211_mgt_subtype_name[subtype >>
865 					IEEE80211_FC0_SUBTYPE_SHIFT],
866 				    "%s", "WEP set but not permitted");
867 				vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
868 				goto out;
869 			}
870 			if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
871 				/*
872 				 * Discard encrypted frames when privacy is off.
873 				 */
874 				IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
875 				    wh, "mgt", "%s", "WEP set but PRIVACY off");
876 				vap->iv_stats.is_rx_noprivacy++;
877 				goto out;
878 			}
879 			hdrspace = ieee80211_hdrspace(ic, wh);
880 			key = ieee80211_crypto_decap(ni, m, hdrspace);
881 			if (key == NULL) {
882 				/* NB: stats+msgs handled in crypto_decap */
883 				goto out;
884 			}
885 			wh = mtod(m, struct ieee80211_frame *);
886 			wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
887 		}
888 		vap->iv_recv_mgmt(ni, m, subtype, rssi, nf);
889 		goto out;
890 
891 	case IEEE80211_FC0_TYPE_CTL:
892 		vap->iv_stats.is_rx_ctl++;
893 		IEEE80211_NODE_STAT(ni, rx_ctrl);
894 		vap->iv_recv_ctl(ni, m, subtype);
895 		goto out;
896 
897 	default:
898 		IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
899 		    wh, NULL, "bad frame type 0x%x", type);
900 		/* should not come here */
901 		break;
902 	}
903 err:
904 	ifp->if_ierrors++;
905 out:
906 	if (m != NULL) {
907 		if (need_tap && ieee80211_radiotap_active_vap(vap))
908 			ieee80211_radiotap_rx(vap, m);
909 		m_freem(m);
910 	}
911 	return type;
912 #undef SEQ_LEQ
913 }
914 
915 static void
916 sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh,
917     int rssi, int nf, uint16_t seq, uint16_t status)
918 {
919 	struct ieee80211vap *vap = ni->ni_vap;
920 
921 	if (ni->ni_authmode == IEEE80211_AUTH_SHARED) {
922 		IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
923 		    ni->ni_macaddr, "open auth",
924 		    "bad sta auth mode %u", ni->ni_authmode);
925 		vap->iv_stats.is_rx_bad_auth++;	/* XXX */
926 		return;
927 	}
928 	if (vap->iv_state != IEEE80211_S_AUTH ||
929 	    seq != IEEE80211_AUTH_OPEN_RESPONSE) {
930 		vap->iv_stats.is_rx_bad_auth++;
931 		return;
932 	}
933 	if (status != 0) {
934 		IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
935 		    ni, "open auth failed (reason %d)", status);
936 		vap->iv_stats.is_rx_auth_fail++;
937 		vap->iv_stats.is_rx_authfail_code = status;
938 		ieee80211_new_state(vap, IEEE80211_S_SCAN,
939 		    IEEE80211_SCAN_FAIL_STATUS);
940 	} else
941 		ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
942 }
943 
944 static void
945 sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh,
946     uint8_t *frm, uint8_t *efrm, int rssi, int nf,
947     uint16_t seq, uint16_t status)
948 {
949 	struct ieee80211vap *vap = ni->ni_vap;
950 	uint8_t *challenge;
951 	int estatus;
952 
953 	/*
954 	 * NB: this can happen as we allow pre-shared key
955 	 * authentication to be enabled w/o wep being turned
956 	 * on so that configuration of these can be done
957 	 * in any order.  It may be better to enforce the
958 	 * ordering in which case this check would just be
959 	 * for sanity/consistency.
960 	 */
961 	if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
962 		IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
963 		    ni->ni_macaddr, "shared key auth",
964 		    "%s", " PRIVACY is disabled");
965 		estatus = IEEE80211_STATUS_ALG;
966 		goto bad;
967 	}
968 	/*
969 	 * Pre-shared key authentication is evil; accept
970 	 * it only if explicitly configured (it is supported
971 	 * mainly for compatibility with clients like OS X).
972 	 */
973 	if (ni->ni_authmode != IEEE80211_AUTH_AUTO &&
974 	    ni->ni_authmode != IEEE80211_AUTH_SHARED) {
975 		IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
976 		    ni->ni_macaddr, "shared key auth",
977 		    "bad sta auth mode %u", ni->ni_authmode);
978 		vap->iv_stats.is_rx_bad_auth++;	/* XXX maybe a unique error? */
979 		estatus = IEEE80211_STATUS_ALG;
980 		goto bad;
981 	}
982 
983 	challenge = NULL;
984 	if (frm + 1 < efrm) {
985 		if ((frm[1] + 2) > (efrm - frm)) {
986 			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
987 			    ni->ni_macaddr, "shared key auth",
988 			    "ie %d/%d too long",
989 			    frm[0], (frm[1] + 2) - (efrm - frm));
990 			vap->iv_stats.is_rx_bad_auth++;
991 			estatus = IEEE80211_STATUS_CHALLENGE;
992 			goto bad;
993 		}
994 		if (*frm == IEEE80211_ELEMID_CHALLENGE)
995 			challenge = frm;
996 		frm += frm[1] + 2;
997 	}
998 	switch (seq) {
999 	case IEEE80211_AUTH_SHARED_CHALLENGE:
1000 	case IEEE80211_AUTH_SHARED_RESPONSE:
1001 		if (challenge == NULL) {
1002 			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1003 			    ni->ni_macaddr, "shared key auth",
1004 			    "%s", "no challenge");
1005 			vap->iv_stats.is_rx_bad_auth++;
1006 			estatus = IEEE80211_STATUS_CHALLENGE;
1007 			goto bad;
1008 		}
1009 		if (challenge[1] != IEEE80211_CHALLENGE_LEN) {
1010 			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1011 			    ni->ni_macaddr, "shared key auth",
1012 			    "bad challenge len %d", challenge[1]);
1013 			vap->iv_stats.is_rx_bad_auth++;
1014 			estatus = IEEE80211_STATUS_CHALLENGE;
1015 			goto bad;
1016 		}
1017 	default:
1018 		break;
1019 	}
1020 	if (vap->iv_state != IEEE80211_S_AUTH)
1021 		return;
1022 	switch (seq) {
1023 	case IEEE80211_AUTH_SHARED_PASS:
1024 		if (ni->ni_challenge != NULL) {
1025 			free(ni->ni_challenge, M_80211_NODE);
1026 			ni->ni_challenge = NULL;
1027 		}
1028 		if (status != 0) {
1029 			IEEE80211_NOTE_FRAME(vap,
1030 			    IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh,
1031 			    "shared key auth failed (reason %d)", status);
1032 			vap->iv_stats.is_rx_auth_fail++;
1033 			vap->iv_stats.is_rx_authfail_code = status;
1034 			return;
1035 		}
1036 		ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
1037 		break;
1038 	case IEEE80211_AUTH_SHARED_CHALLENGE:
1039 		if (!ieee80211_alloc_challenge(ni))
1040 			return;
1041 		/* XXX could optimize by passing recvd challenge */
1042 		memcpy(ni->ni_challenge, &challenge[2], challenge[1]);
1043 		IEEE80211_SEND_MGMT(ni,
1044 			IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
1045 		break;
1046 	default:
1047 		IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH,
1048 		    wh, "shared key auth", "bad seq %d", seq);
1049 		vap->iv_stats.is_rx_bad_auth++;
1050 		return;
1051 	}
1052 	return;
1053 bad:
1054 	/*
1055 	 * Kick the state machine.  This short-circuits
1056 	 * using the mgt frame timeout to trigger the
1057 	 * state transition.
1058 	 */
1059 	if (vap->iv_state == IEEE80211_S_AUTH)
1060 		ieee80211_new_state(vap, IEEE80211_S_SCAN,
1061 		    IEEE80211_SCAN_FAIL_STATUS);
1062 }
1063 
1064 static int
1065 ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm,
1066 	const struct ieee80211_frame *wh)
1067 {
1068 #define	MS(_v, _f)	(((_v) & _f) >> _f##_S)
1069 	struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme;
1070 	u_int len = frm[1], qosinfo;
1071 	int i;
1072 
1073 	if (len < sizeof(struct ieee80211_wme_param)-2) {
1074 		IEEE80211_DISCARD_IE(vap,
1075 		    IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME,
1076 		    wh, "WME", "too short, len %u", len);
1077 		return -1;
1078 	}
1079 	qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)];
1080 	qosinfo &= WME_QOSINFO_COUNT;
1081 	/* XXX do proper check for wraparound */
1082 	if (qosinfo == wme->wme_wmeChanParams.cap_info)
1083 		return 0;
1084 	frm += __offsetof(struct ieee80211_wme_param, params_acParams);
1085 	for (i = 0; i < WME_NUM_AC; i++) {
1086 		struct wmeParams *wmep =
1087 			&wme->wme_wmeChanParams.cap_wmeParams[i];
1088 		/* NB: ACI not used */
1089 		wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM);
1090 		wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN);
1091 		wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN);
1092 		wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX);
1093 		wmep->wmep_txopLimit = LE_READ_2(frm+2);
1094 		frm += 4;
1095 	}
1096 	wme->wme_wmeChanParams.cap_info = qosinfo;
1097 	return 1;
1098 #undef MS
1099 }
1100 
1101 /*
1102  * Process 11h Channel Switch Announcement (CSA) ie.  If this
1103  * is the first CSA then initiate the switch.  Otherwise we
1104  * track state and trigger completion and/or cancel of the switch.
1105  * XXX should be public for IBSS use
1106  */
1107 static void
1108 ieee80211_parse_csaparams(struct ieee80211vap *vap, uint8_t *frm,
1109 	const struct ieee80211_frame *wh)
1110 {
1111 	struct ieee80211com *ic = vap->iv_ic;
1112 	const struct ieee80211_csa_ie *csa =
1113 	    (const struct ieee80211_csa_ie *) frm;
1114 
1115 	KASSERT(vap->iv_state >= IEEE80211_S_RUN,
1116 	    ("state %s", ieee80211_state_name[vap->iv_state]));
1117 
1118 	if (csa->csa_mode > 1) {
1119 		IEEE80211_DISCARD_IE(vap,
1120 		    IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1121 		    wh, "CSA", "invalid mode %u", csa->csa_mode);
1122 		return;
1123 	}
1124 	IEEE80211_LOCK(ic);
1125 	if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) {
1126 		/*
1127 		 * Convert the channel number to a channel reference.  We
1128 		 * try first to preserve turbo attribute of the current
1129 		 * channel then fallback.  Note this will not work if the
1130 		 * CSA specifies a channel that requires a band switch (e.g.
1131 		 * 11a => 11g).  This is intentional as 11h is defined only
1132 		 * for 5GHz/11a and because the switch does not involve a
1133 		 * reassociation, protocol state (capabilities, negotated
1134 		 * rates, etc) may/will be wrong.
1135 		 */
1136 		struct ieee80211_channel *c =
1137 		    ieee80211_find_channel_byieee(ic, csa->csa_newchan,
1138 			(ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALLTURBO));
1139 		if (c == NULL) {
1140 			c = ieee80211_find_channel_byieee(ic,
1141 			    csa->csa_newchan,
1142 			    (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALL));
1143 			if (c == NULL) {
1144 				IEEE80211_DISCARD_IE(vap,
1145 				    IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1146 				    wh, "CSA", "invalid channel %u",
1147 				    csa->csa_newchan);
1148 				goto done;
1149 			}
1150 		}
1151 #if IEEE80211_CSA_COUNT_MIN > 0
1152 		if (csa->csa_count < IEEE80211_CSA_COUNT_MIN) {
1153 			/*
1154 			 * Require at least IEEE80211_CSA_COUNT_MIN count to
1155 			 * reduce the risk of being redirected by a fabricated
1156 			 * CSA.  If a valid CSA is dropped we'll still get a
1157 			 * beacon miss when the AP leaves the channel so we'll
1158 			 * eventually follow to the new channel.
1159 			 *
1160 			 * NOTE: this violates the 11h spec that states that
1161 			 * count may be any value and if 0 then a switch
1162 			 * should happen asap.
1163 			 */
1164 			IEEE80211_DISCARD_IE(vap,
1165 			    IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1166 			    wh, "CSA", "count %u too small, must be >= %u",
1167 			    csa->csa_count, IEEE80211_CSA_COUNT_MIN);
1168 			goto done;
1169 		}
1170 #endif
1171 		ieee80211_csa_startswitch(ic, c, csa->csa_mode, csa->csa_count);
1172 	} else {
1173 		/*
1174 		 * Validate this ie against the initial CSA.  We require
1175 		 * mode and channel not change and the count must be
1176 		 * monotonically decreasing.  This may be pointless and
1177 		 * canceling the switch as a result may be too paranoid but
1178 		 * in the worst case if we drop out of CSA because of this
1179 		 * and the AP does move then we'll just end up taking a
1180 		 * beacon miss and scan to find the AP.
1181 		 *
1182 		 * XXX may want <= on count as we also process ProbeResp
1183 		 * frames and those may come in w/ the same count as the
1184 		 * previous beacon; but doing so leaves us open to a stuck
1185 		 * count until we add a dead-man timer
1186 		 */
1187 		if (!(csa->csa_count < ic->ic_csa_count &&
1188 		      csa->csa_mode == ic->ic_csa_mode &&
1189 		      csa->csa_newchan == ieee80211_chan2ieee(ic, ic->ic_csa_newchan))) {
1190 			IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_DOTH, wh,
1191 			    "CSA ie mismatch, initial ie <%d,%d,%d>, "
1192 			    "this ie <%d,%d,%d>", ic->ic_csa_mode,
1193 			    ic->ic_csa_newchan, ic->ic_csa_count,
1194 			    csa->csa_mode, csa->csa_newchan, csa->csa_count);
1195 			ieee80211_csa_cancelswitch(ic);
1196 		} else {
1197 			if (csa->csa_count <= 1)
1198 				ieee80211_csa_completeswitch(ic);
1199 			else
1200 				ic->ic_csa_count = csa->csa_count;
1201 		}
1202 	}
1203 done:
1204 	IEEE80211_UNLOCK(ic);
1205 }
1206 
1207 /*
1208  * Return non-zero if a background scan may be continued:
1209  * o bg scan is active
1210  * o no channel switch is pending
1211  * o there has not been any traffic recently
1212  *
1213  * Note we do not check if there is an administrative enable;
1214  * this is only done to start the scan.  We assume that any
1215  * change in state will be accompanied by a request to cancel
1216  * active scans which will otherwise cause this test to fail.
1217  */
1218 static __inline int
1219 contbgscan(struct ieee80211vap *vap)
1220 {
1221 	struct ieee80211com *ic = vap->iv_ic;
1222 
1223 	return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) &&
1224 	    (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 &&
1225 	    vap->iv_state == IEEE80211_S_RUN &&		/* XXX? */
1226 	    time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle));
1227 }
1228 
1229 /*
1230  * Return non-zero if a backgrond scan may be started:
1231  * o bg scanning is administratively enabled
1232  * o no channel switch is pending
1233  * o we are not boosted on a dynamic turbo channel
1234  * o there has not been a scan recently
1235  * o there has not been any traffic recently
1236  */
1237 static __inline int
1238 startbgscan(struct ieee80211vap *vap)
1239 {
1240 	struct ieee80211com *ic = vap->iv_ic;
1241 
1242 	return ((vap->iv_flags & IEEE80211_F_BGSCAN) &&
1243 	    (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 &&
1244 #ifdef IEEE80211_SUPPORT_SUPERG
1245 	    !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) &&
1246 #endif
1247 	    time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) &&
1248 	    time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle));
1249 }
1250 
1251 static void
1252 sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
1253 	int subtype, int rssi, int nf)
1254 {
1255 #define	ISPROBE(_st)	((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP)
1256 #define	ISREASSOC(_st)	((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP)
1257 	struct ieee80211vap *vap = ni->ni_vap;
1258 	struct ieee80211com *ic = ni->ni_ic;
1259 	struct ieee80211_frame *wh;
1260 	uint8_t *frm, *efrm;
1261 	uint8_t *rates, *xrates, *wme, *htcap, *htinfo;
1262 	uint8_t rate;
1263 
1264 	wh = mtod(m0, struct ieee80211_frame *);
1265 	frm = (uint8_t *)&wh[1];
1266 	efrm = mtod(m0, uint8_t *) + m0->m_len;
1267 	switch (subtype) {
1268 	case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
1269 	case IEEE80211_FC0_SUBTYPE_BEACON: {
1270 		struct ieee80211_scanparams scan;
1271 		/*
1272 		 * We process beacon/probe response frames:
1273 		 *    o when scanning, or
1274 		 *    o station mode when associated (to collect state
1275 		 *      updates such as 802.11g slot time)
1276 		 * Frames otherwise received are discarded.
1277 		 */
1278 		if (!((ic->ic_flags & IEEE80211_F_SCAN) || ni->ni_associd)) {
1279 			vap->iv_stats.is_rx_mgtdiscard++;
1280 			return;
1281 		}
1282 		/* XXX probe response in sta mode when !scanning? */
1283 		if (ieee80211_parse_beacon(ni, m0, &scan) != 0)
1284 			return;
1285 		/*
1286 		 * Count frame now that we know it's to be processed.
1287 		 */
1288 		if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
1289 			vap->iv_stats.is_rx_beacon++;		/* XXX remove */
1290 			IEEE80211_NODE_STAT(ni, rx_beacons);
1291 		} else
1292 			IEEE80211_NODE_STAT(ni, rx_proberesp);
1293 		/*
1294 		 * When operating in station mode, check for state updates.
1295 		 * Be careful to ignore beacons received while doing a
1296 		 * background scan.  We consider only 11g/WMM stuff right now.
1297 		 */
1298 		if (ni->ni_associd != 0 &&
1299 		    ((ic->ic_flags & IEEE80211_F_SCAN) == 0 ||
1300 		     IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) {
1301 			/* record tsf of last beacon */
1302 			memcpy(ni->ni_tstamp.data, scan.tstamp,
1303 				sizeof(ni->ni_tstamp));
1304 			/* count beacon frame for s/w bmiss handling */
1305 			vap->iv_swbmiss_count++;
1306 			vap->iv_bmiss_count = 0;
1307 			if (ni->ni_erp != scan.erp) {
1308 				IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1309 				    wh->i_addr2,
1310 				    "erp change: was 0x%x, now 0x%x",
1311 				    ni->ni_erp, scan.erp);
1312 				if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1313 				    (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION))
1314 					ic->ic_flags |= IEEE80211_F_USEPROT;
1315 				else
1316 					ic->ic_flags &= ~IEEE80211_F_USEPROT;
1317 				ni->ni_erp = scan.erp;
1318 				/* XXX statistic */
1319 				/* XXX driver notification */
1320 			}
1321 			if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) {
1322 				IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1323 				    wh->i_addr2,
1324 				    "capabilities change: was 0x%x, now 0x%x",
1325 				    ni->ni_capinfo, scan.capinfo);
1326 				/*
1327 				 * NB: we assume short preamble doesn't
1328 				 *     change dynamically
1329 				 */
1330 				ieee80211_set_shortslottime(ic,
1331 					IEEE80211_IS_CHAN_A(ic->ic_bsschan) ||
1332 					(scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME));
1333 				ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME)
1334 					       | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME);
1335 				/* XXX statistic */
1336 			}
1337 			if (scan.wme != NULL &&
1338 			    (ni->ni_flags & IEEE80211_NODE_QOS) &&
1339 			    ieee80211_parse_wmeparams(vap, scan.wme, wh) > 0)
1340 				ieee80211_wme_updateparams(vap);
1341 #ifdef IEEE80211_SUPPORT_SUPERG
1342 			if (scan.ath != NULL)
1343 				ieee80211_parse_athparams(ni, scan.ath, wh);
1344 #endif
1345 			if (scan.htcap != NULL && scan.htinfo != NULL &&
1346 			    (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
1347 				ieee80211_ht_updateparams(ni,
1348 				    scan.htcap, scan.htinfo);
1349 				/* XXX state changes? */
1350 			}
1351 			if (scan.tim != NULL) {
1352 				struct ieee80211_tim_ie *tim =
1353 				    (struct ieee80211_tim_ie *) scan.tim;
1354 #if 0
1355 				int aid = IEEE80211_AID(ni->ni_associd);
1356 				int ix = aid / NBBY;
1357 				int min = tim->tim_bitctl &~ 1;
1358 				int max = tim->tim_len + min - 4;
1359 				if ((tim->tim_bitctl&1) ||
1360 				    (min <= ix && ix <= max &&
1361 				     isset(tim->tim_bitmap - min, aid))) {
1362 					/*
1363 					 * XXX Do not let bg scan kick off
1364 					 * we are expecting data.
1365 					 */
1366 					ic->ic_lastdata = ticks;
1367 					ieee80211_sta_pwrsave(vap, 0);
1368 				}
1369 #endif
1370 				ni->ni_dtim_count = tim->tim_count;
1371 				ni->ni_dtim_period = tim->tim_period;
1372 			}
1373 			if (scan.csa != NULL &&
1374 			    (vap->iv_flags & IEEE80211_F_DOTH))
1375 				ieee80211_parse_csaparams(vap, scan.csa, wh);
1376 			else if (ic->ic_flags & IEEE80211_F_CSAPENDING) {
1377 				/*
1378 				 * No CSA ie or 11h disabled, but a channel
1379 				 * switch is pending; drop out so we aren't
1380 				 * stuck in CSA state.  If the AP really is
1381 				 * moving we'll get a beacon miss and scan.
1382 				 */
1383 				IEEE80211_LOCK(ic);
1384 				ieee80211_csa_cancelswitch(ic);
1385 				IEEE80211_UNLOCK(ic);
1386 			}
1387 			/*
1388 			 * If scanning, pass the info to the scan module.
1389 			 * Otherwise, check if it's the right time to do
1390 			 * a background scan.  Background scanning must
1391 			 * be enabled and we must not be operating in the
1392 			 * turbo phase of dynamic turbo mode.  Then,
1393 			 * it's been a while since the last background
1394 			 * scan and if no data frames have come through
1395 			 * recently, kick off a scan.  Note that this
1396 			 * is the mechanism by which a background scan
1397 			 * is started _and_ continued each time we
1398 			 * return on-channel to receive a beacon from
1399 			 * our ap.
1400 			 */
1401 			if (ic->ic_flags & IEEE80211_F_SCAN) {
1402 				ieee80211_add_scan(vap, &scan, wh,
1403 					subtype, rssi, nf);
1404 			} else if (contbgscan(vap)) {
1405 				ieee80211_bg_scan(vap, 0);
1406 			} else if (startbgscan(vap)) {
1407 				vap->iv_stats.is_scan_bg++;
1408 #if 0
1409 				/* wakeup if we are sleeing */
1410 				ieee80211_set_pwrsave(vap, 0);
1411 #endif
1412 				ieee80211_bg_scan(vap, 0);
1413 			}
1414 			return;
1415 		}
1416 		/*
1417 		 * If scanning, just pass information to the scan module.
1418 		 */
1419 		if (ic->ic_flags & IEEE80211_F_SCAN) {
1420 			if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
1421 				/*
1422 				 * Actively scanning a channel marked passive;
1423 				 * send a probe request now that we know there
1424 				 * is 802.11 traffic present.
1425 				 *
1426 				 * XXX check if the beacon we recv'd gives
1427 				 * us what we need and suppress the probe req
1428 				 */
1429 				ieee80211_probe_curchan(vap, 1);
1430 				ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
1431 			}
1432 			ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf);
1433 			return;
1434 		}
1435 		break;
1436 	}
1437 
1438 	case IEEE80211_FC0_SUBTYPE_AUTH: {
1439 		uint16_t algo, seq, status;
1440 		/*
1441 		 * auth frame format
1442 		 *	[2] algorithm
1443 		 *	[2] sequence
1444 		 *	[2] status
1445 		 *	[tlv*] challenge
1446 		 */
1447 		IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1448 		algo   = le16toh(*(uint16_t *)frm);
1449 		seq    = le16toh(*(uint16_t *)(frm + 2));
1450 		status = le16toh(*(uint16_t *)(frm + 4));
1451 		IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2,
1452 		    "recv auth frame with algorithm %d seq %d", algo, seq);
1453 
1454 		if (vap->iv_flags & IEEE80211_F_COUNTERM) {
1455 			IEEE80211_DISCARD(vap,
1456 			    IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO,
1457 			    wh, "auth", "%s", "TKIP countermeasures enabled");
1458 			vap->iv_stats.is_rx_auth_countermeasures++;
1459 			if (vap->iv_opmode == IEEE80211_M_HOSTAP) {
1460 				ieee80211_send_error(ni, wh->i_addr2,
1461 					IEEE80211_FC0_SUBTYPE_AUTH,
1462 					IEEE80211_REASON_MIC_FAILURE);
1463 			}
1464 			return;
1465 		}
1466 		if (algo == IEEE80211_AUTH_ALG_SHARED)
1467 			sta_auth_shared(ni, wh, frm + 6, efrm, rssi, nf,
1468 			    seq, status);
1469 		else if (algo == IEEE80211_AUTH_ALG_OPEN)
1470 			sta_auth_open(ni, wh, rssi, nf, seq, status);
1471 		else {
1472 			IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1473 			    wh, "auth", "unsupported alg %d", algo);
1474 			vap->iv_stats.is_rx_auth_unsupported++;
1475 			return;
1476 		}
1477 		break;
1478 	}
1479 
1480 	case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
1481 	case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: {
1482 		uint16_t capinfo, associd;
1483 		uint16_t status;
1484 
1485 		if (vap->iv_state != IEEE80211_S_ASSOC) {
1486 			vap->iv_stats.is_rx_mgtdiscard++;
1487 			return;
1488 		}
1489 
1490 		/*
1491 		 * asresp frame format
1492 		 *	[2] capability information
1493 		 *	[2] status
1494 		 *	[2] association ID
1495 		 *	[tlv] supported rates
1496 		 *	[tlv] extended supported rates
1497 		 *	[tlv] WME
1498 		 *	[tlv] HT capabilities
1499 		 *	[tlv] HT info
1500 		 */
1501 		IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1502 		ni = vap->iv_bss;
1503 		capinfo = le16toh(*(uint16_t *)frm);
1504 		frm += 2;
1505 		status = le16toh(*(uint16_t *)frm);
1506 		frm += 2;
1507 		if (status != 0) {
1508 			IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1509 			    wh->i_addr2, "%sassoc failed (reason %d)",
1510 			    ISREASSOC(subtype) ?  "re" : "", status);
1511 			vap->iv_stats.is_rx_auth_fail++;	/* XXX */
1512 			return;
1513 		}
1514 		associd = le16toh(*(uint16_t *)frm);
1515 		frm += 2;
1516 
1517 		rates = xrates = wme = htcap = htinfo = NULL;
1518 		while (efrm - frm > 1) {
1519 			IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1520 			switch (*frm) {
1521 			case IEEE80211_ELEMID_RATES:
1522 				rates = frm;
1523 				break;
1524 			case IEEE80211_ELEMID_XRATES:
1525 				xrates = frm;
1526 				break;
1527 			case IEEE80211_ELEMID_HTCAP:
1528 				htcap = frm;
1529 				break;
1530 			case IEEE80211_ELEMID_HTINFO:
1531 				htinfo = frm;
1532 				break;
1533 			case IEEE80211_ELEMID_VENDOR:
1534 				if (iswmeoui(frm))
1535 					wme = frm;
1536 				else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
1537 					/*
1538 					 * Accept pre-draft HT ie's if the
1539 					 * standard ones have not been seen.
1540 					 */
1541 					if (ishtcapoui(frm)) {
1542 						if (htcap == NULL)
1543 							htcap = frm;
1544 					} else if (ishtinfooui(frm)) {
1545 						if (htinfo == NULL)
1546 							htcap = frm;
1547 					}
1548 				}
1549 				/* XXX Atheros OUI support */
1550 				break;
1551 			}
1552 			frm += frm[1] + 2;
1553 		}
1554 
1555 		IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
1556 		if (xrates != NULL)
1557 			IEEE80211_VERIFY_ELEMENT(xrates,
1558 				IEEE80211_RATE_MAXSIZE - rates[1], return);
1559 		rate = ieee80211_setup_rates(ni, rates, xrates,
1560 				IEEE80211_F_JOIN |
1561 				IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
1562 				IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
1563 		if (rate & IEEE80211_RATE_BASIC) {
1564 			IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1565 			    wh->i_addr2,
1566 			    "%sassoc failed (rate set mismatch)",
1567 			    ISREASSOC(subtype) ?  "re" : "");
1568 			vap->iv_stats.is_rx_assoc_norate++;
1569 			ieee80211_new_state(vap, IEEE80211_S_SCAN,
1570 			    IEEE80211_SCAN_FAIL_STATUS);
1571 			return;
1572 		}
1573 
1574 		ni->ni_capinfo = capinfo;
1575 		ni->ni_associd = associd;
1576 		if (ni->ni_jointime == 0)
1577 			ni->ni_jointime = time_uptime;
1578 		if (wme != NULL &&
1579 		    ieee80211_parse_wmeparams(vap, wme, wh) >= 0) {
1580 			ni->ni_flags |= IEEE80211_NODE_QOS;
1581 			ieee80211_wme_updateparams(vap);
1582 		} else
1583 			ni->ni_flags &= ~IEEE80211_NODE_QOS;
1584 		/*
1585 		 * Setup HT state according to the negotiation.
1586 		 *
1587 		 * NB: shouldn't need to check if HT use is enabled but some
1588 		 *     ap's send back HT ie's even when we don't indicate we
1589 		 *     are HT capable in our AssocReq.
1590 		 */
1591 		if (htcap != NULL && htinfo != NULL &&
1592 		    (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
1593 			ieee80211_ht_node_init(ni);
1594 			ieee80211_ht_updateparams(ni, htcap, htinfo);
1595 			ieee80211_setup_htrates(ni, htcap,
1596 			     IEEE80211_F_JOIN | IEEE80211_F_DOBRS);
1597 			ieee80211_setup_basic_htrates(ni, htinfo);
1598 			ieee80211_node_setuptxparms(ni);
1599 		} else {
1600 #ifdef IEEE80211_SUPPORT_SUPERG
1601 			if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_ATH))
1602 				ieee80211_ff_node_init(ni);
1603 #endif
1604 		}
1605 		/*
1606 		 * Configure state now that we are associated.
1607 		 *
1608 		 * XXX may need different/additional driver callbacks?
1609 		 */
1610 		if (IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
1611 		    (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) {
1612 			ic->ic_flags |= IEEE80211_F_SHPREAMBLE;
1613 			ic->ic_flags &= ~IEEE80211_F_USEBARKER;
1614 		} else {
1615 			ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE;
1616 			ic->ic_flags |= IEEE80211_F_USEBARKER;
1617 		}
1618 		ieee80211_set_shortslottime(ic,
1619 			IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
1620 			(ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME));
1621 		/*
1622 		 * Honor ERP protection.
1623 		 *
1624 		 * NB: ni_erp should zero for non-11g operation.
1625 		 */
1626 		if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1627 		    (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION))
1628 			ic->ic_flags |= IEEE80211_F_USEPROT;
1629 		else
1630 			ic->ic_flags &= ~IEEE80211_F_USEPROT;
1631 		IEEE80211_NOTE_MAC(vap,
1632 		    IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2,
1633 		    "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s",
1634 		    ISREASSOC(subtype) ? "re" : "",
1635 		    IEEE80211_NODE_AID(ni),
1636 		    ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long",
1637 		    ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long",
1638 		    ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "",
1639 		    ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "",
1640 		    ni->ni_flags & IEEE80211_NODE_HT ?
1641 			(ni->ni_chw == 40 ? ", HT40" : ", HT20") : "",
1642 		    ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "",
1643 		    ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" :
1644 			ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "",
1645 		    ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "",
1646 		    IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ?
1647 			", fast-frames" : "",
1648 		    IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ?
1649 			", turbo" : ""
1650 		);
1651 		ieee80211_new_state(vap, IEEE80211_S_RUN, subtype);
1652 		break;
1653 	}
1654 
1655 	case IEEE80211_FC0_SUBTYPE_DEAUTH: {
1656 		uint16_t reason;
1657 
1658 		if (vap->iv_state == IEEE80211_S_SCAN) {
1659 			vap->iv_stats.is_rx_mgtdiscard++;
1660 			return;
1661 		}
1662 		if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
1663 			/* NB: can happen when in promiscuous mode */
1664 			vap->iv_stats.is_rx_mgtdiscard++;
1665 			break;
1666 		}
1667 
1668 		/*
1669 		 * deauth frame format
1670 		 *	[2] reason
1671 		 */
1672 		IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
1673 		reason = le16toh(*(uint16_t *)frm);
1674 
1675 		vap->iv_stats.is_rx_deauth++;
1676 		vap->iv_stats.is_rx_deauth_code = reason;
1677 		IEEE80211_NODE_STAT(ni, rx_deauth);
1678 
1679 		IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
1680 		    "recv deauthenticate (reason %d)", reason);
1681 		ieee80211_new_state(vap, IEEE80211_S_AUTH,
1682 		    (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH);
1683 		break;
1684 	}
1685 
1686 	case IEEE80211_FC0_SUBTYPE_DISASSOC: {
1687 		uint16_t reason;
1688 
1689 		if (vap->iv_state != IEEE80211_S_RUN &&
1690 		    vap->iv_state != IEEE80211_S_ASSOC &&
1691 		    vap->iv_state != IEEE80211_S_AUTH) {
1692 			vap->iv_stats.is_rx_mgtdiscard++;
1693 			return;
1694 		}
1695 		if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
1696 			/* NB: can happen when in promiscuous mode */
1697 			vap->iv_stats.is_rx_mgtdiscard++;
1698 			break;
1699 		}
1700 
1701 		/*
1702 		 * disassoc frame format
1703 		 *	[2] reason
1704 		 */
1705 		IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
1706 		reason = le16toh(*(uint16_t *)frm);
1707 
1708 		vap->iv_stats.is_rx_disassoc++;
1709 		vap->iv_stats.is_rx_disassoc_code = reason;
1710 		IEEE80211_NODE_STAT(ni, rx_disassoc);
1711 
1712 		IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
1713 		    "recv disassociate (reason %d)", reason);
1714 		ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
1715 		break;
1716 	}
1717 
1718 	case IEEE80211_FC0_SUBTYPE_ACTION:
1719 		if (vap->iv_state == IEEE80211_S_RUN) {
1720 			if (ieee80211_parse_action(ni, m0) == 0)
1721 				ic->ic_recv_action(ni, wh, frm, efrm);
1722 		} else
1723 			vap->iv_stats.is_rx_mgtdiscard++;
1724 		break;
1725 
1726 	case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
1727 	case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
1728 	case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
1729 		vap->iv_stats.is_rx_mgtdiscard++;
1730 		return;
1731 	default:
1732 		IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1733 		     wh, "mgt", "subtype 0x%x not handled", subtype);
1734 		vap->iv_stats.is_rx_badsubtype++;
1735 		break;
1736 	}
1737 #undef ISREASSOC
1738 #undef ISPROBE
1739 }
1740 
1741 static void
1742 sta_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
1743 {
1744 	switch (subtype) {
1745 	case IEEE80211_FC0_SUBTYPE_BAR:
1746 		ieee80211_recv_bar(ni, m);
1747 		break;
1748 	}
1749 }
1750